[Feature]add MT2731_MP2_MR2_SVN388 baseline version
Change-Id: Ief04314834b31e27effab435d3ca8ba33b499059
diff --git a/src/kernel/linux/v4.14/drivers/nvme/Kconfig b/src/kernel/linux/v4.14/drivers/nvme/Kconfig
new file mode 100644
index 0000000..b7c78a5
--- /dev/null
+++ b/src/kernel/linux/v4.14/drivers/nvme/Kconfig
@@ -0,0 +1,2 @@
+source "drivers/nvme/host/Kconfig"
+source "drivers/nvme/target/Kconfig"
diff --git a/src/kernel/linux/v4.14/drivers/nvme/Makefile b/src/kernel/linux/v4.14/drivers/nvme/Makefile
new file mode 100644
index 0000000..0096a7f
--- /dev/null
+++ b/src/kernel/linux/v4.14/drivers/nvme/Makefile
@@ -0,0 +1,3 @@
+
+obj-y += host/
+obj-y += target/
diff --git a/src/kernel/linux/v4.14/drivers/nvme/host/Kconfig b/src/kernel/linux/v4.14/drivers/nvme/host/Kconfig
new file mode 100644
index 0000000..8f845de
--- /dev/null
+++ b/src/kernel/linux/v4.14/drivers/nvme/host/Kconfig
@@ -0,0 +1,50 @@
+config NVME_CORE
+ tristate
+
+config BLK_DEV_NVME
+ tristate "NVM Express block device"
+ depends on PCI && BLOCK
+ select NVME_CORE
+ ---help---
+ The NVM Express driver is for solid state drives directly
+ connected to the PCI or PCI Express bus. If you know you
+ don't have one of these, it is safe to answer N.
+
+ To compile this driver as a module, choose M here: the
+ module will be called nvme.
+
+config NVME_FABRICS
+ tristate
+
+config NVME_RDMA
+ tristate "NVM Express over Fabrics RDMA host driver"
+ depends on INFINIBAND && INFINIBAND_ADDR_TRANS && BLOCK
+ select NVME_CORE
+ select NVME_FABRICS
+ select SG_POOL
+ help
+ This provides support for the NVMe over Fabrics protocol using
+ the RDMA (Infiniband, RoCE, iWarp) transport. This allows you
+ to use remote block devices exported using the NVMe protocol set.
+
+ To configure a NVMe over Fabrics controller use the nvme-cli tool
+ from https://github.com/linux-nvme/nvme-cli.
+
+ If unsure, say N.
+
+config NVME_FC
+ tristate "NVM Express over Fabrics FC host driver"
+ depends on BLOCK
+ depends on HAS_DMA
+ select NVME_CORE
+ select NVME_FABRICS
+ select SG_POOL
+ help
+ This provides support for the NVMe over Fabrics protocol using
+ the FC transport. This allows you to use remote block devices
+ exported using the NVMe protocol set.
+
+ To configure a NVMe over Fabrics controller use the nvme-cli tool
+ from https://github.com/linux-nvme/nvme-cli.
+
+ If unsure, say N.
diff --git a/src/kernel/linux/v4.14/drivers/nvme/host/Makefile b/src/kernel/linux/v4.14/drivers/nvme/host/Makefile
new file mode 100644
index 0000000..7b96e45
--- /dev/null
+++ b/src/kernel/linux/v4.14/drivers/nvme/host/Makefile
@@ -0,0 +1,17 @@
+# SPDX-License-Identifier: GPL-2.0
+obj-$(CONFIG_NVME_CORE) += nvme-core.o
+obj-$(CONFIG_BLK_DEV_NVME) += nvme.o
+obj-$(CONFIG_NVME_FABRICS) += nvme-fabrics.o
+obj-$(CONFIG_NVME_RDMA) += nvme-rdma.o
+obj-$(CONFIG_NVME_FC) += nvme-fc.o
+
+nvme-core-y := core.o
+nvme-core-$(CONFIG_NVM) += lightnvm.o
+
+nvme-y += pci.o
+
+nvme-fabrics-y += fabrics.o
+
+nvme-rdma-y += rdma.o
+
+nvme-fc-y += fc.o
diff --git a/src/kernel/linux/v4.14/drivers/nvme/host/core.c b/src/kernel/linux/v4.14/drivers/nvme/host/core.c
new file mode 100644
index 0000000..2d95755
--- /dev/null
+++ b/src/kernel/linux/v4.14/drivers/nvme/host/core.c
@@ -0,0 +1,3005 @@
+/*
+ * NVM Express device driver
+ * Copyright (c) 2011-2014, Intel Corporation.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ */
+
+#include <linux/blkdev.h>
+#include <linux/blk-mq.h>
+#include <linux/delay.h>
+#include <linux/errno.h>
+#include <linux/hdreg.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/list_sort.h>
+#include <linux/slab.h>
+#include <linux/types.h>
+#include <linux/pr.h>
+#include <linux/ptrace.h>
+#include <linux/nvme_ioctl.h>
+#include <linux/t10-pi.h>
+#include <linux/pm_qos.h>
+#include <asm/unaligned.h>
+
+#include "nvme.h"
+#include "fabrics.h"
+
+#define NVME_MINORS (1U << MINORBITS)
+
+unsigned char admin_timeout = 60;
+module_param(admin_timeout, byte, 0644);
+MODULE_PARM_DESC(admin_timeout, "timeout in seconds for admin commands");
+EXPORT_SYMBOL_GPL(admin_timeout);
+
+unsigned char nvme_io_timeout = 30;
+module_param_named(io_timeout, nvme_io_timeout, byte, 0644);
+MODULE_PARM_DESC(io_timeout, "timeout in seconds for I/O");
+EXPORT_SYMBOL_GPL(nvme_io_timeout);
+
+static unsigned char shutdown_timeout = 5;
+module_param(shutdown_timeout, byte, 0644);
+MODULE_PARM_DESC(shutdown_timeout, "timeout in seconds for controller shutdown");
+
+static u8 nvme_max_retries = 5;
+module_param_named(max_retries, nvme_max_retries, byte, 0644);
+MODULE_PARM_DESC(max_retries, "max number of retries a command may have");
+
+static int nvme_char_major;
+module_param(nvme_char_major, int, 0);
+
+static unsigned long default_ps_max_latency_us = 100000;
+module_param(default_ps_max_latency_us, ulong, 0644);
+MODULE_PARM_DESC(default_ps_max_latency_us,
+ "max power saving latency for new devices; use PM QOS to change per device");
+
+static bool force_apst;
+module_param(force_apst, bool, 0644);
+MODULE_PARM_DESC(force_apst, "allow APST for newly enumerated devices even if quirked off");
+
+static bool streams;
+module_param(streams, bool, 0644);
+MODULE_PARM_DESC(streams, "turn on support for Streams write directives");
+
+struct workqueue_struct *nvme_wq;
+EXPORT_SYMBOL_GPL(nvme_wq);
+
+static LIST_HEAD(nvme_ctrl_list);
+static DEFINE_SPINLOCK(dev_list_lock);
+
+static struct class *nvme_class;
+
+static __le32 nvme_get_log_dw10(u8 lid, size_t size)
+{
+ return cpu_to_le32((((size / 4) - 1) << 16) | lid);
+}
+
+int nvme_reset_ctrl(struct nvme_ctrl *ctrl)
+{
+ if (!nvme_change_ctrl_state(ctrl, NVME_CTRL_RESETTING))
+ return -EBUSY;
+ if (!queue_work(nvme_wq, &ctrl->reset_work))
+ return -EBUSY;
+ return 0;
+}
+EXPORT_SYMBOL_GPL(nvme_reset_ctrl);
+
+static int nvme_reset_ctrl_sync(struct nvme_ctrl *ctrl)
+{
+ int ret;
+
+ ret = nvme_reset_ctrl(ctrl);
+ if (!ret)
+ flush_work(&ctrl->reset_work);
+ return ret;
+}
+
+static blk_status_t nvme_error_status(struct request *req)
+{
+ switch (nvme_req(req)->status & 0x7ff) {
+ case NVME_SC_SUCCESS:
+ return BLK_STS_OK;
+ case NVME_SC_CAP_EXCEEDED:
+ return BLK_STS_NOSPC;
+ case NVME_SC_ONCS_NOT_SUPPORTED:
+ return BLK_STS_NOTSUPP;
+ case NVME_SC_WRITE_FAULT:
+ case NVME_SC_READ_ERROR:
+ case NVME_SC_UNWRITTEN_BLOCK:
+ case NVME_SC_ACCESS_DENIED:
+ case NVME_SC_READ_ONLY:
+ return BLK_STS_MEDIUM;
+ case NVME_SC_GUARD_CHECK:
+ case NVME_SC_APPTAG_CHECK:
+ case NVME_SC_REFTAG_CHECK:
+ case NVME_SC_INVALID_PI:
+ return BLK_STS_PROTECTION;
+ case NVME_SC_RESERVATION_CONFLICT:
+ return BLK_STS_NEXUS;
+ default:
+ return BLK_STS_IOERR;
+ }
+}
+
+static inline bool nvme_req_needs_retry(struct request *req)
+{
+ if (blk_noretry_request(req))
+ return false;
+ if (nvme_req(req)->status & NVME_SC_DNR)
+ return false;
+ if (nvme_req(req)->retries >= nvme_max_retries)
+ return false;
+ return true;
+}
+
+void nvme_complete_rq(struct request *req)
+{
+ if (unlikely(nvme_req(req)->status && nvme_req_needs_retry(req))) {
+ nvme_req(req)->retries++;
+ blk_mq_requeue_request(req, true);
+ return;
+ }
+
+ blk_mq_end_request(req, nvme_error_status(req));
+}
+EXPORT_SYMBOL_GPL(nvme_complete_rq);
+
+void nvme_cancel_request(struct request *req, void *data, bool reserved)
+{
+ int status;
+
+ if (!blk_mq_request_started(req))
+ return;
+
+ dev_dbg_ratelimited(((struct nvme_ctrl *) data)->device,
+ "Cancelling I/O %d", req->tag);
+
+ status = NVME_SC_ABORT_REQ;
+ if (blk_queue_dying(req->q))
+ status |= NVME_SC_DNR;
+ nvme_req(req)->status = status;
+ blk_mq_complete_request(req);
+
+}
+EXPORT_SYMBOL_GPL(nvme_cancel_request);
+
+bool nvme_change_ctrl_state(struct nvme_ctrl *ctrl,
+ enum nvme_ctrl_state new_state)
+{
+ enum nvme_ctrl_state old_state;
+ unsigned long flags;
+ bool changed = false;
+
+ spin_lock_irqsave(&ctrl->lock, flags);
+
+ old_state = ctrl->state;
+ switch (new_state) {
+ case NVME_CTRL_LIVE:
+ switch (old_state) {
+ case NVME_CTRL_NEW:
+ case NVME_CTRL_RESETTING:
+ case NVME_CTRL_RECONNECTING:
+ changed = true;
+ /* FALLTHRU */
+ default:
+ break;
+ }
+ break;
+ case NVME_CTRL_RESETTING:
+ switch (old_state) {
+ case NVME_CTRL_NEW:
+ case NVME_CTRL_LIVE:
+ changed = true;
+ /* FALLTHRU */
+ default:
+ break;
+ }
+ break;
+ case NVME_CTRL_RECONNECTING:
+ switch (old_state) {
+ case NVME_CTRL_LIVE:
+ changed = true;
+ /* FALLTHRU */
+ default:
+ break;
+ }
+ break;
+ case NVME_CTRL_DELETING:
+ switch (old_state) {
+ case NVME_CTRL_LIVE:
+ case NVME_CTRL_RESETTING:
+ case NVME_CTRL_RECONNECTING:
+ changed = true;
+ /* FALLTHRU */
+ default:
+ break;
+ }
+ break;
+ case NVME_CTRL_DEAD:
+ switch (old_state) {
+ case NVME_CTRL_DELETING:
+ changed = true;
+ /* FALLTHRU */
+ default:
+ break;
+ }
+ break;
+ default:
+ break;
+ }
+
+ if (changed)
+ ctrl->state = new_state;
+
+ spin_unlock_irqrestore(&ctrl->lock, flags);
+
+ return changed;
+}
+EXPORT_SYMBOL_GPL(nvme_change_ctrl_state);
+
+static void nvme_free_ns(struct kref *kref)
+{
+ struct nvme_ns *ns = container_of(kref, struct nvme_ns, kref);
+
+ if (ns->ndev)
+ nvme_nvm_unregister(ns);
+
+ if (ns->disk) {
+ spin_lock(&dev_list_lock);
+ ns->disk->private_data = NULL;
+ spin_unlock(&dev_list_lock);
+ }
+
+ put_disk(ns->disk);
+ ida_simple_remove(&ns->ctrl->ns_ida, ns->instance);
+ nvme_put_ctrl(ns->ctrl);
+ kfree(ns);
+}
+
+static void nvme_put_ns(struct nvme_ns *ns)
+{
+ kref_put(&ns->kref, nvme_free_ns);
+}
+
+static struct nvme_ns *nvme_get_ns_from_disk(struct gendisk *disk)
+{
+ struct nvme_ns *ns;
+
+ spin_lock(&dev_list_lock);
+ ns = disk->private_data;
+ if (ns) {
+ if (!kref_get_unless_zero(&ns->kref))
+ goto fail;
+ if (!try_module_get(ns->ctrl->ops->module))
+ goto fail_put_ns;
+ }
+ spin_unlock(&dev_list_lock);
+
+ return ns;
+
+fail_put_ns:
+ kref_put(&ns->kref, nvme_free_ns);
+fail:
+ spin_unlock(&dev_list_lock);
+ return NULL;
+}
+
+struct request *nvme_alloc_request(struct request_queue *q,
+ struct nvme_command *cmd, unsigned int flags, int qid)
+{
+ unsigned op = nvme_is_write(cmd) ? REQ_OP_DRV_OUT : REQ_OP_DRV_IN;
+ struct request *req;
+
+ if (qid == NVME_QID_ANY) {
+ req = blk_mq_alloc_request(q, op, flags);
+ } else {
+ req = blk_mq_alloc_request_hctx(q, op, flags,
+ qid ? qid - 1 : 0);
+ }
+ if (IS_ERR(req))
+ return req;
+
+ req->cmd_flags |= REQ_FAILFAST_DRIVER;
+ nvme_req(req)->cmd = cmd;
+
+ return req;
+}
+EXPORT_SYMBOL_GPL(nvme_alloc_request);
+
+static int nvme_toggle_streams(struct nvme_ctrl *ctrl, bool enable)
+{
+ struct nvme_command c;
+
+ memset(&c, 0, sizeof(c));
+
+ c.directive.opcode = nvme_admin_directive_send;
+ c.directive.nsid = cpu_to_le32(NVME_NSID_ALL);
+ c.directive.doper = NVME_DIR_SND_ID_OP_ENABLE;
+ c.directive.dtype = NVME_DIR_IDENTIFY;
+ c.directive.tdtype = NVME_DIR_STREAMS;
+ c.directive.endir = enable ? NVME_DIR_ENDIR : 0;
+
+ return nvme_submit_sync_cmd(ctrl->admin_q, &c, NULL, 0);
+}
+
+static int nvme_disable_streams(struct nvme_ctrl *ctrl)
+{
+ return nvme_toggle_streams(ctrl, false);
+}
+
+static int nvme_enable_streams(struct nvme_ctrl *ctrl)
+{
+ return nvme_toggle_streams(ctrl, true);
+}
+
+static int nvme_get_stream_params(struct nvme_ctrl *ctrl,
+ struct streams_directive_params *s, u32 nsid)
+{
+ struct nvme_command c;
+
+ memset(&c, 0, sizeof(c));
+ memset(s, 0, sizeof(*s));
+
+ c.directive.opcode = nvme_admin_directive_recv;
+ c.directive.nsid = cpu_to_le32(nsid);
+ c.directive.numd = cpu_to_le32((sizeof(*s) >> 2) - 1);
+ c.directive.doper = NVME_DIR_RCV_ST_OP_PARAM;
+ c.directive.dtype = NVME_DIR_STREAMS;
+
+ return nvme_submit_sync_cmd(ctrl->admin_q, &c, s, sizeof(*s));
+}
+
+static int nvme_configure_directives(struct nvme_ctrl *ctrl)
+{
+ struct streams_directive_params s;
+ int ret;
+
+ if (!(ctrl->oacs & NVME_CTRL_OACS_DIRECTIVES))
+ return 0;
+ if (!streams)
+ return 0;
+
+ ret = nvme_enable_streams(ctrl);
+ if (ret)
+ return ret;
+
+ ret = nvme_get_stream_params(ctrl, &s, NVME_NSID_ALL);
+ if (ret)
+ return ret;
+
+ ctrl->nssa = le16_to_cpu(s.nssa);
+ if (ctrl->nssa < BLK_MAX_WRITE_HINTS - 1) {
+ dev_info(ctrl->device, "too few streams (%u) available\n",
+ ctrl->nssa);
+ nvme_disable_streams(ctrl);
+ return 0;
+ }
+
+ ctrl->nr_streams = min_t(unsigned, ctrl->nssa, BLK_MAX_WRITE_HINTS - 1);
+ dev_info(ctrl->device, "Using %u streams\n", ctrl->nr_streams);
+ return 0;
+}
+
+/*
+ * Check if 'req' has a write hint associated with it. If it does, assign
+ * a valid namespace stream to the write.
+ */
+static void nvme_assign_write_stream(struct nvme_ctrl *ctrl,
+ struct request *req, u16 *control,
+ u32 *dsmgmt)
+{
+ enum rw_hint streamid = req->write_hint;
+
+ if (streamid == WRITE_LIFE_NOT_SET || streamid == WRITE_LIFE_NONE)
+ streamid = 0;
+ else {
+ streamid--;
+ if (WARN_ON_ONCE(streamid > ctrl->nr_streams))
+ return;
+
+ *control |= NVME_RW_DTYPE_STREAMS;
+ *dsmgmt |= streamid << 16;
+ }
+
+ if (streamid < ARRAY_SIZE(req->q->write_hints))
+ req->q->write_hints[streamid] += blk_rq_bytes(req) >> 9;
+}
+
+static inline void nvme_setup_flush(struct nvme_ns *ns,
+ struct nvme_command *cmnd)
+{
+ memset(cmnd, 0, sizeof(*cmnd));
+ cmnd->common.opcode = nvme_cmd_flush;
+ cmnd->common.nsid = cpu_to_le32(ns->ns_id);
+}
+
+static blk_status_t nvme_setup_discard(struct nvme_ns *ns, struct request *req,
+ struct nvme_command *cmnd)
+{
+ unsigned short segments = blk_rq_nr_discard_segments(req), n = 0;
+ struct nvme_dsm_range *range;
+ struct bio *bio;
+
+ range = kmalloc_array(segments, sizeof(*range), GFP_ATOMIC);
+ if (!range)
+ return BLK_STS_RESOURCE;
+
+ __rq_for_each_bio(bio, req) {
+ u64 slba = nvme_block_nr(ns, bio->bi_iter.bi_sector);
+ u32 nlb = bio->bi_iter.bi_size >> ns->lba_shift;
+
+ range[n].cattr = cpu_to_le32(0);
+ range[n].nlb = cpu_to_le32(nlb);
+ range[n].slba = cpu_to_le64(slba);
+ n++;
+ }
+
+ if (WARN_ON_ONCE(n != segments)) {
+ kfree(range);
+ return BLK_STS_IOERR;
+ }
+
+ memset(cmnd, 0, sizeof(*cmnd));
+ cmnd->dsm.opcode = nvme_cmd_dsm;
+ cmnd->dsm.nsid = cpu_to_le32(ns->ns_id);
+ cmnd->dsm.nr = cpu_to_le32(segments - 1);
+ cmnd->dsm.attributes = cpu_to_le32(NVME_DSMGMT_AD);
+
+ req->special_vec.bv_page = virt_to_page(range);
+ req->special_vec.bv_offset = offset_in_page(range);
+ req->special_vec.bv_len = sizeof(*range) * segments;
+ req->rq_flags |= RQF_SPECIAL_PAYLOAD;
+
+ return BLK_STS_OK;
+}
+
+static inline blk_status_t nvme_setup_rw(struct nvme_ns *ns,
+ struct request *req, struct nvme_command *cmnd)
+{
+ struct nvme_ctrl *ctrl = ns->ctrl;
+ u16 control = 0;
+ u32 dsmgmt = 0;
+
+ /*
+ * If formated with metadata, require the block layer provide a buffer
+ * unless this namespace is formated such that the metadata can be
+ * stripped/generated by the controller with PRACT=1.
+ */
+ if (ns && ns->ms &&
+ (!ns->pi_type || ns->ms != sizeof(struct t10_pi_tuple)) &&
+ !blk_integrity_rq(req) && !blk_rq_is_passthrough(req))
+ return BLK_STS_NOTSUPP;
+
+ if (req->cmd_flags & REQ_FUA)
+ control |= NVME_RW_FUA;
+ if (req->cmd_flags & (REQ_FAILFAST_DEV | REQ_RAHEAD))
+ control |= NVME_RW_LR;
+
+ if (req->cmd_flags & REQ_RAHEAD)
+ dsmgmt |= NVME_RW_DSM_FREQ_PREFETCH;
+
+ memset(cmnd, 0, sizeof(*cmnd));
+ cmnd->rw.opcode = (rq_data_dir(req) ? nvme_cmd_write : nvme_cmd_read);
+ cmnd->rw.nsid = cpu_to_le32(ns->ns_id);
+ cmnd->rw.slba = cpu_to_le64(nvme_block_nr(ns, blk_rq_pos(req)));
+ cmnd->rw.length = cpu_to_le16((blk_rq_bytes(req) >> ns->lba_shift) - 1);
+
+ if (req_op(req) == REQ_OP_WRITE && ctrl->nr_streams)
+ nvme_assign_write_stream(ctrl, req, &control, &dsmgmt);
+
+ if (ns->ms) {
+ switch (ns->pi_type) {
+ case NVME_NS_DPS_PI_TYPE3:
+ control |= NVME_RW_PRINFO_PRCHK_GUARD;
+ break;
+ case NVME_NS_DPS_PI_TYPE1:
+ case NVME_NS_DPS_PI_TYPE2:
+ control |= NVME_RW_PRINFO_PRCHK_GUARD |
+ NVME_RW_PRINFO_PRCHK_REF;
+ cmnd->rw.reftag = cpu_to_le32(
+ nvme_block_nr(ns, blk_rq_pos(req)));
+ break;
+ }
+ if (!blk_integrity_rq(req))
+ control |= NVME_RW_PRINFO_PRACT;
+ }
+
+ cmnd->rw.control = cpu_to_le16(control);
+ cmnd->rw.dsmgmt = cpu_to_le32(dsmgmt);
+ return 0;
+}
+
+blk_status_t nvme_setup_cmd(struct nvme_ns *ns, struct request *req,
+ struct nvme_command *cmd)
+{
+ blk_status_t ret = BLK_STS_OK;
+
+ if (!(req->rq_flags & RQF_DONTPREP)) {
+ nvme_req(req)->retries = 0;
+ nvme_req(req)->flags = 0;
+ req->rq_flags |= RQF_DONTPREP;
+ }
+
+ switch (req_op(req)) {
+ case REQ_OP_DRV_IN:
+ case REQ_OP_DRV_OUT:
+ memcpy(cmd, nvme_req(req)->cmd, sizeof(*cmd));
+ break;
+ case REQ_OP_FLUSH:
+ nvme_setup_flush(ns, cmd);
+ break;
+ case REQ_OP_WRITE_ZEROES:
+ /* currently only aliased to deallocate for a few ctrls: */
+ case REQ_OP_DISCARD:
+ ret = nvme_setup_discard(ns, req, cmd);
+ break;
+ case REQ_OP_READ:
+ case REQ_OP_WRITE:
+ ret = nvme_setup_rw(ns, req, cmd);
+ break;
+ default:
+ WARN_ON_ONCE(1);
+ return BLK_STS_IOERR;
+ }
+
+ cmd->common.command_id = req->tag;
+ return ret;
+}
+EXPORT_SYMBOL_GPL(nvme_setup_cmd);
+
+/*
+ * Returns 0 on success. If the result is negative, it's a Linux error code;
+ * if the result is positive, it's an NVM Express status code
+ */
+int __nvme_submit_sync_cmd(struct request_queue *q, struct nvme_command *cmd,
+ union nvme_result *result, void *buffer, unsigned bufflen,
+ unsigned timeout, int qid, int at_head, int flags)
+{
+ struct request *req;
+ int ret;
+
+ req = nvme_alloc_request(q, cmd, flags, qid);
+ if (IS_ERR(req))
+ return PTR_ERR(req);
+
+ req->timeout = timeout ? timeout : ADMIN_TIMEOUT;
+
+ if (buffer && bufflen) {
+ ret = blk_rq_map_kern(q, req, buffer, bufflen, GFP_KERNEL);
+ if (ret)
+ goto out;
+ }
+
+ blk_execute_rq(req->q, NULL, req, at_head);
+ if (result)
+ *result = nvme_req(req)->result;
+ if (nvme_req(req)->flags & NVME_REQ_CANCELLED)
+ ret = -EINTR;
+ else
+ ret = nvme_req(req)->status;
+ out:
+ blk_mq_free_request(req);
+ return ret;
+}
+EXPORT_SYMBOL_GPL(__nvme_submit_sync_cmd);
+
+int nvme_submit_sync_cmd(struct request_queue *q, struct nvme_command *cmd,
+ void *buffer, unsigned bufflen)
+{
+ return __nvme_submit_sync_cmd(q, cmd, NULL, buffer, bufflen, 0,
+ NVME_QID_ANY, 0, 0);
+}
+EXPORT_SYMBOL_GPL(nvme_submit_sync_cmd);
+
+static void *nvme_add_user_metadata(struct bio *bio, void __user *ubuf,
+ unsigned len, u32 seed, bool write)
+{
+ struct bio_integrity_payload *bip;
+ int ret = -ENOMEM;
+ void *buf;
+
+ buf = kmalloc(len, GFP_KERNEL);
+ if (!buf)
+ goto out;
+
+ ret = -EFAULT;
+ if (write && copy_from_user(buf, ubuf, len))
+ goto out_free_meta;
+
+ bip = bio_integrity_alloc(bio, GFP_KERNEL, 1);
+ if (IS_ERR(bip)) {
+ ret = PTR_ERR(bip);
+ goto out_free_meta;
+ }
+
+ bip->bip_iter.bi_size = len;
+ bip->bip_iter.bi_sector = seed;
+ ret = bio_integrity_add_page(bio, virt_to_page(buf), len,
+ offset_in_page(buf));
+ if (ret == len)
+ return buf;
+ ret = -ENOMEM;
+out_free_meta:
+ kfree(buf);
+out:
+ return ERR_PTR(ret);
+}
+
+static int nvme_submit_user_cmd(struct request_queue *q,
+ struct nvme_command *cmd, void __user *ubuffer,
+ unsigned bufflen, void __user *meta_buffer, unsigned meta_len,
+ u32 meta_seed, u32 *result, unsigned timeout)
+{
+ bool write = nvme_is_write(cmd);
+ struct nvme_ns *ns = q->queuedata;
+ struct gendisk *disk = ns ? ns->disk : NULL;
+ struct request *req;
+ struct bio *bio = NULL;
+ void *meta = NULL;
+ int ret;
+
+ req = nvme_alloc_request(q, cmd, 0, NVME_QID_ANY);
+ if (IS_ERR(req))
+ return PTR_ERR(req);
+
+ req->timeout = timeout ? timeout : ADMIN_TIMEOUT;
+
+ if (ubuffer && bufflen) {
+ ret = blk_rq_map_user(q, req, NULL, ubuffer, bufflen,
+ GFP_KERNEL);
+ if (ret)
+ goto out;
+ bio = req->bio;
+ bio->bi_disk = disk;
+ if (disk && meta_buffer && meta_len) {
+ meta = nvme_add_user_metadata(bio, meta_buffer, meta_len,
+ meta_seed, write);
+ if (IS_ERR(meta)) {
+ ret = PTR_ERR(meta);
+ goto out_unmap;
+ }
+ req->cmd_flags |= REQ_INTEGRITY;
+ }
+ }
+
+ blk_execute_rq(req->q, disk, req, 0);
+ if (nvme_req(req)->flags & NVME_REQ_CANCELLED)
+ ret = -EINTR;
+ else
+ ret = nvme_req(req)->status;
+ if (result)
+ *result = le32_to_cpu(nvme_req(req)->result.u32);
+ if (meta && !ret && !write) {
+ if (copy_to_user(meta_buffer, meta, meta_len))
+ ret = -EFAULT;
+ }
+ kfree(meta);
+ out_unmap:
+ if (bio)
+ blk_rq_unmap_user(bio);
+ out:
+ blk_mq_free_request(req);
+ return ret;
+}
+
+static void nvme_keep_alive_end_io(struct request *rq, blk_status_t status)
+{
+ struct nvme_ctrl *ctrl = rq->end_io_data;
+
+ blk_mq_free_request(rq);
+
+ if (status) {
+ dev_err(ctrl->device,
+ "failed nvme_keep_alive_end_io error=%d\n",
+ status);
+ return;
+ }
+
+ schedule_delayed_work(&ctrl->ka_work, ctrl->kato * HZ);
+}
+
+static int nvme_keep_alive(struct nvme_ctrl *ctrl)
+{
+ struct nvme_command c;
+ struct request *rq;
+
+ memset(&c, 0, sizeof(c));
+ c.common.opcode = nvme_admin_keep_alive;
+
+ rq = nvme_alloc_request(ctrl->admin_q, &c, BLK_MQ_REQ_RESERVED,
+ NVME_QID_ANY);
+ if (IS_ERR(rq))
+ return PTR_ERR(rq);
+
+ rq->timeout = ctrl->kato * HZ;
+ rq->end_io_data = ctrl;
+
+ blk_execute_rq_nowait(rq->q, NULL, rq, 0, nvme_keep_alive_end_io);
+
+ return 0;
+}
+
+static void nvme_keep_alive_work(struct work_struct *work)
+{
+ struct nvme_ctrl *ctrl = container_of(to_delayed_work(work),
+ struct nvme_ctrl, ka_work);
+
+ if (nvme_keep_alive(ctrl)) {
+ /* allocation failure, reset the controller */
+ dev_err(ctrl->device, "keep-alive failed\n");
+ nvme_reset_ctrl(ctrl);
+ return;
+ }
+}
+
+void nvme_start_keep_alive(struct nvme_ctrl *ctrl)
+{
+ if (unlikely(ctrl->kato == 0))
+ return;
+
+ INIT_DELAYED_WORK(&ctrl->ka_work, nvme_keep_alive_work);
+ schedule_delayed_work(&ctrl->ka_work, ctrl->kato * HZ);
+}
+EXPORT_SYMBOL_GPL(nvme_start_keep_alive);
+
+void nvme_stop_keep_alive(struct nvme_ctrl *ctrl)
+{
+ if (unlikely(ctrl->kato == 0))
+ return;
+
+ cancel_delayed_work_sync(&ctrl->ka_work);
+}
+EXPORT_SYMBOL_GPL(nvme_stop_keep_alive);
+
+/*
+ * In NVMe 1.0 the CNS field was just a binary controller or namespace
+ * flag, thus sending any new CNS opcodes has a big chance of not working.
+ * Qemu unfortunately had that bug after reporting a 1.1 version compliance
+ * (but not for any later version).
+ */
+static bool nvme_ctrl_limited_cns(struct nvme_ctrl *ctrl)
+{
+ if (ctrl->quirks & NVME_QUIRK_IDENTIFY_CNS)
+ return ctrl->vs < NVME_VS(1, 2, 0);
+ return ctrl->vs < NVME_VS(1, 1, 0);
+}
+
+static int nvme_identify_ctrl(struct nvme_ctrl *dev, struct nvme_id_ctrl **id)
+{
+ struct nvme_command c = { };
+ int error;
+
+ /* gcc-4.4.4 (at least) has issues with initializers and anon unions */
+ c.identify.opcode = nvme_admin_identify;
+ c.identify.cns = NVME_ID_CNS_CTRL;
+
+ *id = kmalloc(sizeof(struct nvme_id_ctrl), GFP_KERNEL);
+ if (!*id)
+ return -ENOMEM;
+
+ error = nvme_submit_sync_cmd(dev->admin_q, &c, *id,
+ sizeof(struct nvme_id_ctrl));
+ if (error)
+ kfree(*id);
+ return error;
+}
+
+static int nvme_identify_ns_descs(struct nvme_ctrl *ctrl, unsigned nsid,
+ u8 *eui64, u8 *nguid, uuid_t *uuid)
+{
+ struct nvme_command c = { };
+ int status;
+ void *data;
+ int pos;
+ int len;
+
+ c.identify.opcode = nvme_admin_identify;
+ c.identify.nsid = cpu_to_le32(nsid);
+ c.identify.cns = NVME_ID_CNS_NS_DESC_LIST;
+
+ data = kzalloc(NVME_IDENTIFY_DATA_SIZE, GFP_KERNEL);
+ if (!data)
+ return -ENOMEM;
+
+ status = nvme_submit_sync_cmd(ctrl->admin_q, &c, data,
+ NVME_IDENTIFY_DATA_SIZE);
+ if (status)
+ goto free_data;
+
+ for (pos = 0; pos < NVME_IDENTIFY_DATA_SIZE; pos += len) {
+ struct nvme_ns_id_desc *cur = data + pos;
+
+ if (cur->nidl == 0)
+ break;
+
+ switch (cur->nidt) {
+ case NVME_NIDT_EUI64:
+ if (cur->nidl != NVME_NIDT_EUI64_LEN) {
+ dev_warn(ctrl->device,
+ "ctrl returned bogus length: %d for NVME_NIDT_EUI64\n",
+ cur->nidl);
+ goto free_data;
+ }
+ len = NVME_NIDT_EUI64_LEN;
+ memcpy(eui64, data + pos + sizeof(*cur), len);
+ break;
+ case NVME_NIDT_NGUID:
+ if (cur->nidl != NVME_NIDT_NGUID_LEN) {
+ dev_warn(ctrl->device,
+ "ctrl returned bogus length: %d for NVME_NIDT_NGUID\n",
+ cur->nidl);
+ goto free_data;
+ }
+ len = NVME_NIDT_NGUID_LEN;
+ memcpy(nguid, data + pos + sizeof(*cur), len);
+ break;
+ case NVME_NIDT_UUID:
+ if (cur->nidl != NVME_NIDT_UUID_LEN) {
+ dev_warn(ctrl->device,
+ "ctrl returned bogus length: %d for NVME_NIDT_UUID\n",
+ cur->nidl);
+ goto free_data;
+ }
+ len = NVME_NIDT_UUID_LEN;
+ uuid_copy(uuid, data + pos + sizeof(*cur));
+ break;
+ default:
+ /* Skip unnkown types */
+ len = cur->nidl;
+ break;
+ }
+
+ len += sizeof(*cur);
+ }
+free_data:
+ kfree(data);
+ return status;
+}
+
+static int nvme_identify_ns_list(struct nvme_ctrl *dev, unsigned nsid, __le32 *ns_list)
+{
+ struct nvme_command c = { };
+
+ c.identify.opcode = nvme_admin_identify;
+ c.identify.cns = NVME_ID_CNS_NS_ACTIVE_LIST;
+ c.identify.nsid = cpu_to_le32(nsid);
+ return nvme_submit_sync_cmd(dev->admin_q, &c, ns_list, 0x1000);
+}
+
+static struct nvme_id_ns *nvme_identify_ns(struct nvme_ctrl *ctrl,
+ unsigned nsid)
+{
+ struct nvme_id_ns *id;
+ struct nvme_command c = { };
+ int error;
+
+ /* gcc-4.4.4 (at least) has issues with initializers and anon unions */
+ c.identify.opcode = nvme_admin_identify;
+ c.identify.nsid = cpu_to_le32(nsid);
+ c.identify.cns = NVME_ID_CNS_NS;
+
+ id = kmalloc(sizeof(*id), GFP_KERNEL);
+ if (!id)
+ return NULL;
+
+ error = nvme_submit_sync_cmd(ctrl->admin_q, &c, id, sizeof(*id));
+ if (error) {
+ dev_warn(ctrl->device, "Identify namespace failed\n");
+ kfree(id);
+ return NULL;
+ }
+
+ return id;
+}
+
+static int nvme_set_features(struct nvme_ctrl *dev, unsigned fid, unsigned dword11,
+ void *buffer, size_t buflen, u32 *result)
+{
+ union nvme_result res = { 0 };
+ struct nvme_command c;
+ int ret;
+
+ memset(&c, 0, sizeof(c));
+ c.features.opcode = nvme_admin_set_features;
+ c.features.fid = cpu_to_le32(fid);
+ c.features.dword11 = cpu_to_le32(dword11);
+
+ ret = __nvme_submit_sync_cmd(dev->admin_q, &c, &res,
+ buffer, buflen, 0, NVME_QID_ANY, 0, 0);
+ if (ret >= 0 && result)
+ *result = le32_to_cpu(res.u32);
+ return ret;
+}
+
+int nvme_set_queue_count(struct nvme_ctrl *ctrl, int *count)
+{
+ u32 q_count = (*count - 1) | ((*count - 1) << 16);
+ u32 result;
+ int status, nr_io_queues;
+
+ status = nvme_set_features(ctrl, NVME_FEAT_NUM_QUEUES, q_count, NULL, 0,
+ &result);
+ if (status < 0)
+ return status;
+
+ /*
+ * Degraded controllers might return an error when setting the queue
+ * count. We still want to be able to bring them online and offer
+ * access to the admin queue, as that might be only way to fix them up.
+ */
+ if (status > 0) {
+ dev_err(ctrl->device, "Could not set queue count (%d)\n", status);
+ *count = 0;
+ } else {
+ nr_io_queues = min(result & 0xffff, result >> 16) + 1;
+ *count = min(*count, nr_io_queues);
+ }
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(nvme_set_queue_count);
+
+static int nvme_submit_io(struct nvme_ns *ns, struct nvme_user_io __user *uio)
+{
+ struct nvme_user_io io;
+ struct nvme_command c;
+ unsigned length, meta_len;
+ void __user *metadata;
+
+ if (copy_from_user(&io, uio, sizeof(io)))
+ return -EFAULT;
+ if (io.flags)
+ return -EINVAL;
+
+ switch (io.opcode) {
+ case nvme_cmd_write:
+ case nvme_cmd_read:
+ case nvme_cmd_compare:
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ length = (io.nblocks + 1) << ns->lba_shift;
+ meta_len = (io.nblocks + 1) * ns->ms;
+ metadata = (void __user *)(uintptr_t)io.metadata;
+
+ if (ns->ext) {
+ length += meta_len;
+ meta_len = 0;
+ } else if (meta_len) {
+ if ((io.metadata & 3) || !io.metadata)
+ return -EINVAL;
+ }
+
+ memset(&c, 0, sizeof(c));
+ c.rw.opcode = io.opcode;
+ c.rw.flags = io.flags;
+ c.rw.nsid = cpu_to_le32(ns->ns_id);
+ c.rw.slba = cpu_to_le64(io.slba);
+ c.rw.length = cpu_to_le16(io.nblocks);
+ c.rw.control = cpu_to_le16(io.control);
+ c.rw.dsmgmt = cpu_to_le32(io.dsmgmt);
+ c.rw.reftag = cpu_to_le32(io.reftag);
+ c.rw.apptag = cpu_to_le16(io.apptag);
+ c.rw.appmask = cpu_to_le16(io.appmask);
+
+ return nvme_submit_user_cmd(ns->queue, &c,
+ (void __user *)(uintptr_t)io.addr, length,
+ metadata, meta_len, io.slba, NULL, 0);
+}
+
+static int nvme_user_cmd(struct nvme_ctrl *ctrl, struct nvme_ns *ns,
+ struct nvme_passthru_cmd __user *ucmd)
+{
+ struct nvme_passthru_cmd cmd;
+ struct nvme_command c;
+ unsigned timeout = 0;
+ int status;
+
+ if (!capable(CAP_SYS_ADMIN))
+ return -EACCES;
+ if (copy_from_user(&cmd, ucmd, sizeof(cmd)))
+ return -EFAULT;
+ if (cmd.flags)
+ return -EINVAL;
+
+ memset(&c, 0, sizeof(c));
+ c.common.opcode = cmd.opcode;
+ c.common.flags = cmd.flags;
+ c.common.nsid = cpu_to_le32(cmd.nsid);
+ c.common.cdw2[0] = cpu_to_le32(cmd.cdw2);
+ c.common.cdw2[1] = cpu_to_le32(cmd.cdw3);
+ c.common.cdw10[0] = cpu_to_le32(cmd.cdw10);
+ c.common.cdw10[1] = cpu_to_le32(cmd.cdw11);
+ c.common.cdw10[2] = cpu_to_le32(cmd.cdw12);
+ c.common.cdw10[3] = cpu_to_le32(cmd.cdw13);
+ c.common.cdw10[4] = cpu_to_le32(cmd.cdw14);
+ c.common.cdw10[5] = cpu_to_le32(cmd.cdw15);
+
+ if (cmd.timeout_ms)
+ timeout = msecs_to_jiffies(cmd.timeout_ms);
+
+ status = nvme_submit_user_cmd(ns ? ns->queue : ctrl->admin_q, &c,
+ (void __user *)(uintptr_t)cmd.addr, cmd.data_len,
+ (void __user *)(uintptr_t)cmd.metadata, cmd.metadata_len,
+ 0, &cmd.result, timeout);
+ if (status >= 0) {
+ if (put_user(cmd.result, &ucmd->result))
+ return -EFAULT;
+ }
+
+ return status;
+}
+
+static int nvme_ioctl(struct block_device *bdev, fmode_t mode,
+ unsigned int cmd, unsigned long arg)
+{
+ struct nvme_ns *ns = bdev->bd_disk->private_data;
+
+ switch (cmd) {
+ case NVME_IOCTL_ID:
+ force_successful_syscall_return();
+ return ns->ns_id;
+ case NVME_IOCTL_ADMIN_CMD:
+ return nvme_user_cmd(ns->ctrl, NULL, (void __user *)arg);
+ case NVME_IOCTL_IO_CMD:
+ return nvme_user_cmd(ns->ctrl, ns, (void __user *)arg);
+ case NVME_IOCTL_SUBMIT_IO:
+ return nvme_submit_io(ns, (void __user *)arg);
+ default:
+ if (ns->ndev)
+ return nvme_nvm_ioctl(ns, cmd, arg);
+ if (is_sed_ioctl(cmd))
+ return sed_ioctl(ns->ctrl->opal_dev, cmd,
+ (void __user *) arg);
+ return -ENOTTY;
+ }
+}
+
+#ifdef CONFIG_COMPAT
+static int nvme_compat_ioctl(struct block_device *bdev, fmode_t mode,
+ unsigned int cmd, unsigned long arg)
+{
+ return nvme_ioctl(bdev, mode, cmd, arg);
+}
+#else
+#define nvme_compat_ioctl NULL
+#endif
+
+static int nvme_open(struct block_device *bdev, fmode_t mode)
+{
+ return nvme_get_ns_from_disk(bdev->bd_disk) ? 0 : -ENXIO;
+}
+
+static void nvme_release(struct gendisk *disk, fmode_t mode)
+{
+ struct nvme_ns *ns = disk->private_data;
+
+ module_put(ns->ctrl->ops->module);
+ nvme_put_ns(ns);
+}
+
+static int nvme_getgeo(struct block_device *bdev, struct hd_geometry *geo)
+{
+ /* some standard values */
+ geo->heads = 1 << 6;
+ geo->sectors = 1 << 5;
+ geo->cylinders = get_capacity(bdev->bd_disk) >> 11;
+ return 0;
+}
+
+#ifdef CONFIG_BLK_DEV_INTEGRITY
+static void nvme_prep_integrity(struct gendisk *disk, struct nvme_id_ns *id,
+ u16 bs)
+{
+ struct nvme_ns *ns = disk->private_data;
+ u16 old_ms = ns->ms;
+ u8 pi_type = 0;
+
+ ns->ms = le16_to_cpu(id->lbaf[id->flbas & NVME_NS_FLBAS_LBA_MASK].ms);
+ ns->ext = ns->ms && (id->flbas & NVME_NS_FLBAS_META_EXT);
+
+ /* PI implementation requires metadata equal t10 pi tuple size */
+ if (ns->ms == sizeof(struct t10_pi_tuple))
+ pi_type = id->dps & NVME_NS_DPS_PI_MASK;
+
+ if (blk_get_integrity(disk) &&
+ (ns->pi_type != pi_type || ns->ms != old_ms ||
+ bs != queue_logical_block_size(disk->queue) ||
+ (ns->ms && ns->ext)))
+ blk_integrity_unregister(disk);
+
+ ns->pi_type = pi_type;
+}
+
+static void nvme_init_integrity(struct nvme_ns *ns)
+{
+ struct blk_integrity integrity;
+
+ memset(&integrity, 0, sizeof(integrity));
+ switch (ns->pi_type) {
+ case NVME_NS_DPS_PI_TYPE3:
+ integrity.profile = &t10_pi_type3_crc;
+ integrity.tag_size = sizeof(u16) + sizeof(u32);
+ integrity.flags |= BLK_INTEGRITY_DEVICE_CAPABLE;
+ break;
+ case NVME_NS_DPS_PI_TYPE1:
+ case NVME_NS_DPS_PI_TYPE2:
+ integrity.profile = &t10_pi_type1_crc;
+ integrity.tag_size = sizeof(u16);
+ integrity.flags |= BLK_INTEGRITY_DEVICE_CAPABLE;
+ break;
+ default:
+ integrity.profile = NULL;
+ break;
+ }
+ integrity.tuple_size = ns->ms;
+ blk_integrity_register(ns->disk, &integrity);
+ blk_queue_max_integrity_segments(ns->queue, 1);
+}
+#else
+static void nvme_prep_integrity(struct gendisk *disk, struct nvme_id_ns *id,
+ u16 bs)
+{
+}
+static void nvme_init_integrity(struct nvme_ns *ns)
+{
+}
+#endif /* CONFIG_BLK_DEV_INTEGRITY */
+
+static void nvme_set_chunk_size(struct nvme_ns *ns)
+{
+ u32 chunk_size = (((u32)ns->noiob) << (ns->lba_shift - 9));
+ blk_queue_chunk_sectors(ns->queue, rounddown_pow_of_two(chunk_size));
+}
+
+static void nvme_config_discard(struct nvme_ns *ns)
+{
+ struct nvme_ctrl *ctrl = ns->ctrl;
+ u32 logical_block_size = queue_logical_block_size(ns->queue);
+
+ BUILD_BUG_ON(PAGE_SIZE / sizeof(struct nvme_dsm_range) <
+ NVME_DSM_MAX_RANGES);
+
+ if (ctrl->nr_streams && ns->sws && ns->sgs) {
+ unsigned int sz = logical_block_size * ns->sws * ns->sgs;
+
+ ns->queue->limits.discard_alignment = sz;
+ ns->queue->limits.discard_granularity = sz;
+ } else {
+ ns->queue->limits.discard_alignment = logical_block_size;
+ ns->queue->limits.discard_granularity = logical_block_size;
+ }
+ blk_queue_max_discard_sectors(ns->queue, UINT_MAX);
+ blk_queue_max_discard_segments(ns->queue, NVME_DSM_MAX_RANGES);
+ queue_flag_set_unlocked(QUEUE_FLAG_DISCARD, ns->queue);
+
+ if (ctrl->quirks & NVME_QUIRK_DEALLOCATE_ZEROES)
+ blk_queue_max_write_zeroes_sectors(ns->queue, UINT_MAX);
+}
+
+static void nvme_report_ns_ids(struct nvme_ctrl *ctrl, unsigned int nsid,
+ struct nvme_id_ns *id, u8 *eui64, u8 *nguid, uuid_t *uuid)
+{
+ if (ctrl->vs >= NVME_VS(1, 1, 0))
+ memcpy(eui64, id->eui64, sizeof(id->eui64));
+ if (ctrl->vs >= NVME_VS(1, 2, 0))
+ memcpy(nguid, id->nguid, sizeof(id->nguid));
+ if (ctrl->vs >= NVME_VS(1, 3, 0)) {
+ /* Don't treat error as fatal we potentially
+ * already have a NGUID or EUI-64
+ */
+ if (nvme_identify_ns_descs(ctrl, nsid, eui64, nguid, uuid))
+ dev_warn(ctrl->device,
+ "%s: Identify Descriptors failed\n", __func__);
+ }
+}
+
+static void __nvme_revalidate_disk(struct gendisk *disk, struct nvme_id_ns *id)
+{
+ struct nvme_ns *ns = disk->private_data;
+ struct nvme_ctrl *ctrl = ns->ctrl;
+ u16 bs;
+
+ /*
+ * If identify namespace failed, use default 512 byte block size so
+ * block layer can use before failing read/write for 0 capacity.
+ */
+ ns->lba_shift = id->lbaf[id->flbas & NVME_NS_FLBAS_LBA_MASK].ds;
+ if (ns->lba_shift == 0)
+ ns->lba_shift = 9;
+ bs = 1 << ns->lba_shift;
+ ns->noiob = le16_to_cpu(id->noiob);
+
+ blk_mq_freeze_queue(disk->queue);
+
+ if (ctrl->ops->flags & NVME_F_METADATA_SUPPORTED)
+ nvme_prep_integrity(disk, id, bs);
+ blk_queue_logical_block_size(ns->queue, bs);
+ if (ns->noiob)
+ nvme_set_chunk_size(ns);
+ if (ns->ms && !blk_get_integrity(disk) && !ns->ext)
+ nvme_init_integrity(ns);
+ if (ns->ms && !(ns->ms == 8 && ns->pi_type) && !blk_get_integrity(disk))
+ set_capacity(disk, 0);
+ else
+ set_capacity(disk, le64_to_cpup(&id->nsze) << (ns->lba_shift - 9));
+
+ if (ctrl->oncs & NVME_CTRL_ONCS_DSM)
+ nvme_config_discard(ns);
+ blk_mq_unfreeze_queue(disk->queue);
+}
+
+static int nvme_revalidate_disk(struct gendisk *disk)
+{
+ struct nvme_ns *ns = disk->private_data;
+ struct nvme_ctrl *ctrl = ns->ctrl;
+ struct nvme_id_ns *id;
+ u8 eui64[8] = { 0 }, nguid[16] = { 0 };
+ uuid_t uuid = uuid_null;
+ int ret = 0;
+
+ if (test_bit(NVME_NS_DEAD, &ns->flags)) {
+ set_capacity(disk, 0);
+ return -ENODEV;
+ }
+
+ id = nvme_identify_ns(ctrl, ns->ns_id);
+ if (!id)
+ return -ENODEV;
+
+ if (id->ncap == 0) {
+ ret = -ENODEV;
+ goto out;
+ }
+
+ __nvme_revalidate_disk(disk, id);
+ nvme_report_ns_ids(ctrl, ns->ns_id, id, eui64, nguid, &uuid);
+ if (!uuid_equal(&ns->uuid, &uuid) ||
+ memcmp(&ns->nguid, &nguid, sizeof(ns->nguid)) ||
+ memcmp(&ns->eui, &eui64, sizeof(ns->eui))) {
+ dev_err(ctrl->device,
+ "identifiers changed for nsid %d\n", ns->ns_id);
+ ret = -ENODEV;
+ }
+
+out:
+ kfree(id);
+ return ret;
+}
+
+static char nvme_pr_type(enum pr_type type)
+{
+ switch (type) {
+ case PR_WRITE_EXCLUSIVE:
+ return 1;
+ case PR_EXCLUSIVE_ACCESS:
+ return 2;
+ case PR_WRITE_EXCLUSIVE_REG_ONLY:
+ return 3;
+ case PR_EXCLUSIVE_ACCESS_REG_ONLY:
+ return 4;
+ case PR_WRITE_EXCLUSIVE_ALL_REGS:
+ return 5;
+ case PR_EXCLUSIVE_ACCESS_ALL_REGS:
+ return 6;
+ default:
+ return 0;
+ }
+};
+
+static int nvme_pr_command(struct block_device *bdev, u32 cdw10,
+ u64 key, u64 sa_key, u8 op)
+{
+ struct nvme_ns *ns = bdev->bd_disk->private_data;
+ struct nvme_command c;
+ u8 data[16] = { 0, };
+
+ put_unaligned_le64(key, &data[0]);
+ put_unaligned_le64(sa_key, &data[8]);
+
+ memset(&c, 0, sizeof(c));
+ c.common.opcode = op;
+ c.common.nsid = cpu_to_le32(ns->ns_id);
+ c.common.cdw10[0] = cpu_to_le32(cdw10);
+
+ return nvme_submit_sync_cmd(ns->queue, &c, data, 16);
+}
+
+static int nvme_pr_register(struct block_device *bdev, u64 old,
+ u64 new, unsigned flags)
+{
+ u32 cdw10;
+
+ if (flags & ~PR_FL_IGNORE_KEY)
+ return -EOPNOTSUPP;
+
+ cdw10 = old ? 2 : 0;
+ cdw10 |= (flags & PR_FL_IGNORE_KEY) ? 1 << 3 : 0;
+ cdw10 |= (1 << 30) | (1 << 31); /* PTPL=1 */
+ return nvme_pr_command(bdev, cdw10, old, new, nvme_cmd_resv_register);
+}
+
+static int nvme_pr_reserve(struct block_device *bdev, u64 key,
+ enum pr_type type, unsigned flags)
+{
+ u32 cdw10;
+
+ if (flags & ~PR_FL_IGNORE_KEY)
+ return -EOPNOTSUPP;
+
+ cdw10 = nvme_pr_type(type) << 8;
+ cdw10 |= ((flags & PR_FL_IGNORE_KEY) ? 1 << 3 : 0);
+ return nvme_pr_command(bdev, cdw10, key, 0, nvme_cmd_resv_acquire);
+}
+
+static int nvme_pr_preempt(struct block_device *bdev, u64 old, u64 new,
+ enum pr_type type, bool abort)
+{
+ u32 cdw10 = nvme_pr_type(type) << 8 | (abort ? 2 : 1);
+ return nvme_pr_command(bdev, cdw10, old, new, nvme_cmd_resv_acquire);
+}
+
+static int nvme_pr_clear(struct block_device *bdev, u64 key)
+{
+ u32 cdw10 = 1 | (key ? 1 << 3 : 0);
+ return nvme_pr_command(bdev, cdw10, key, 0, nvme_cmd_resv_register);
+}
+
+static int nvme_pr_release(struct block_device *bdev, u64 key, enum pr_type type)
+{
+ u32 cdw10 = nvme_pr_type(type) << 8 | (key ? 1 << 3 : 0);
+ return nvme_pr_command(bdev, cdw10, key, 0, nvme_cmd_resv_release);
+}
+
+static const struct pr_ops nvme_pr_ops = {
+ .pr_register = nvme_pr_register,
+ .pr_reserve = nvme_pr_reserve,
+ .pr_release = nvme_pr_release,
+ .pr_preempt = nvme_pr_preempt,
+ .pr_clear = nvme_pr_clear,
+};
+
+#ifdef CONFIG_BLK_SED_OPAL
+int nvme_sec_submit(void *data, u16 spsp, u8 secp, void *buffer, size_t len,
+ bool send)
+{
+ struct nvme_ctrl *ctrl = data;
+ struct nvme_command cmd;
+
+ memset(&cmd, 0, sizeof(cmd));
+ if (send)
+ cmd.common.opcode = nvme_admin_security_send;
+ else
+ cmd.common.opcode = nvme_admin_security_recv;
+ cmd.common.nsid = 0;
+ cmd.common.cdw10[0] = cpu_to_le32(((u32)secp) << 24 | ((u32)spsp) << 8);
+ cmd.common.cdw10[1] = cpu_to_le32(len);
+
+ return __nvme_submit_sync_cmd(ctrl->admin_q, &cmd, NULL, buffer, len,
+ ADMIN_TIMEOUT, NVME_QID_ANY, 1, 0);
+}
+EXPORT_SYMBOL_GPL(nvme_sec_submit);
+#endif /* CONFIG_BLK_SED_OPAL */
+
+static const struct block_device_operations nvme_fops = {
+ .owner = THIS_MODULE,
+ .ioctl = nvme_ioctl,
+ .compat_ioctl = nvme_compat_ioctl,
+ .open = nvme_open,
+ .release = nvme_release,
+ .getgeo = nvme_getgeo,
+ .revalidate_disk= nvme_revalidate_disk,
+ .pr_ops = &nvme_pr_ops,
+};
+
+static int nvme_wait_ready(struct nvme_ctrl *ctrl, u64 cap, bool enabled)
+{
+ unsigned long timeout =
+ ((NVME_CAP_TIMEOUT(cap) + 1) * HZ / 2) + jiffies;
+ u32 csts, bit = enabled ? NVME_CSTS_RDY : 0;
+ int ret;
+
+ while ((ret = ctrl->ops->reg_read32(ctrl, NVME_REG_CSTS, &csts)) == 0) {
+ if (csts == ~0)
+ return -ENODEV;
+ if ((csts & NVME_CSTS_RDY) == bit)
+ break;
+
+ msleep(100);
+ if (fatal_signal_pending(current))
+ return -EINTR;
+ if (time_after(jiffies, timeout)) {
+ dev_err(ctrl->device,
+ "Device not ready; aborting %s\n", enabled ?
+ "initialisation" : "reset");
+ return -ENODEV;
+ }
+ }
+
+ return ret;
+}
+
+/*
+ * If the device has been passed off to us in an enabled state, just clear
+ * the enabled bit. The spec says we should set the 'shutdown notification
+ * bits', but doing so may cause the device to complete commands to the
+ * admin queue ... and we don't know what memory that might be pointing at!
+ */
+int nvme_disable_ctrl(struct nvme_ctrl *ctrl, u64 cap)
+{
+ int ret;
+
+ ctrl->ctrl_config &= ~NVME_CC_SHN_MASK;
+ ctrl->ctrl_config &= ~NVME_CC_ENABLE;
+
+ ret = ctrl->ops->reg_write32(ctrl, NVME_REG_CC, ctrl->ctrl_config);
+ if (ret)
+ return ret;
+
+ if (ctrl->quirks & NVME_QUIRK_DELAY_BEFORE_CHK_RDY)
+ msleep(NVME_QUIRK_DELAY_AMOUNT);
+
+ return nvme_wait_ready(ctrl, cap, false);
+}
+EXPORT_SYMBOL_GPL(nvme_disable_ctrl);
+
+int nvme_enable_ctrl(struct nvme_ctrl *ctrl, u64 cap)
+{
+ /*
+ * Default to a 4K page size, with the intention to update this
+ * path in the future to accomodate architectures with differing
+ * kernel and IO page sizes.
+ */
+ unsigned dev_page_min = NVME_CAP_MPSMIN(cap) + 12, page_shift = 12;
+ int ret;
+
+ if (page_shift < dev_page_min) {
+ dev_err(ctrl->device,
+ "Minimum device page size %u too large for host (%u)\n",
+ 1 << dev_page_min, 1 << page_shift);
+ return -ENODEV;
+ }
+
+ ctrl->page_size = 1 << page_shift;
+
+ ctrl->ctrl_config = NVME_CC_CSS_NVM;
+ ctrl->ctrl_config |= (page_shift - 12) << NVME_CC_MPS_SHIFT;
+ ctrl->ctrl_config |= NVME_CC_AMS_RR | NVME_CC_SHN_NONE;
+ ctrl->ctrl_config |= NVME_CC_IOSQES | NVME_CC_IOCQES;
+ ctrl->ctrl_config |= NVME_CC_ENABLE;
+
+ ret = ctrl->ops->reg_write32(ctrl, NVME_REG_CC, ctrl->ctrl_config);
+ if (ret)
+ return ret;
+ return nvme_wait_ready(ctrl, cap, true);
+}
+EXPORT_SYMBOL_GPL(nvme_enable_ctrl);
+
+int nvme_shutdown_ctrl(struct nvme_ctrl *ctrl)
+{
+ unsigned long timeout = jiffies + (ctrl->shutdown_timeout * HZ);
+ u32 csts;
+ int ret;
+
+ ctrl->ctrl_config &= ~NVME_CC_SHN_MASK;
+ ctrl->ctrl_config |= NVME_CC_SHN_NORMAL;
+
+ ret = ctrl->ops->reg_write32(ctrl, NVME_REG_CC, ctrl->ctrl_config);
+ if (ret)
+ return ret;
+
+ while ((ret = ctrl->ops->reg_read32(ctrl, NVME_REG_CSTS, &csts)) == 0) {
+ if ((csts & NVME_CSTS_SHST_MASK) == NVME_CSTS_SHST_CMPLT)
+ break;
+
+ msleep(100);
+ if (fatal_signal_pending(current))
+ return -EINTR;
+ if (time_after(jiffies, timeout)) {
+ dev_err(ctrl->device,
+ "Device shutdown incomplete; abort shutdown\n");
+ return -ENODEV;
+ }
+ }
+
+ return ret;
+}
+EXPORT_SYMBOL_GPL(nvme_shutdown_ctrl);
+
+static void nvme_set_queue_limits(struct nvme_ctrl *ctrl,
+ struct request_queue *q)
+{
+ bool vwc = false;
+
+ if (ctrl->max_hw_sectors) {
+ u32 max_segments =
+ (ctrl->max_hw_sectors / (ctrl->page_size >> 9)) + 1;
+
+ blk_queue_max_hw_sectors(q, ctrl->max_hw_sectors);
+ blk_queue_max_segments(q, min_t(u32, max_segments, USHRT_MAX));
+ }
+ if ((ctrl->quirks & NVME_QUIRK_STRIPE_SIZE) &&
+ is_power_of_2(ctrl->max_hw_sectors))
+ blk_queue_chunk_sectors(q, ctrl->max_hw_sectors);
+ blk_queue_virt_boundary(q, ctrl->page_size - 1);
+ if (ctrl->vwc & NVME_CTRL_VWC_PRESENT)
+ vwc = true;
+ blk_queue_write_cache(q, vwc, vwc);
+}
+
+static int nvme_configure_timestamp(struct nvme_ctrl *ctrl)
+{
+ __le64 ts;
+ int ret;
+
+ if (!(ctrl->oncs & NVME_CTRL_ONCS_TIMESTAMP))
+ return 0;
+
+ ts = cpu_to_le64(ktime_to_ms(ktime_get_real()));
+ ret = nvme_set_features(ctrl, NVME_FEAT_TIMESTAMP, 0, &ts, sizeof(ts),
+ NULL);
+ if (ret)
+ dev_warn_once(ctrl->device,
+ "could not set timestamp (%d)\n", ret);
+ return ret;
+}
+
+static int nvme_configure_apst(struct nvme_ctrl *ctrl)
+{
+ /*
+ * APST (Autonomous Power State Transition) lets us program a
+ * table of power state transitions that the controller will
+ * perform automatically. We configure it with a simple
+ * heuristic: we are willing to spend at most 2% of the time
+ * transitioning between power states. Therefore, when running
+ * in any given state, we will enter the next lower-power
+ * non-operational state after waiting 50 * (enlat + exlat)
+ * microseconds, as long as that state's exit latency is under
+ * the requested maximum latency.
+ *
+ * We will not autonomously enter any non-operational state for
+ * which the total latency exceeds ps_max_latency_us. Users
+ * can set ps_max_latency_us to zero to turn off APST.
+ */
+
+ unsigned apste;
+ struct nvme_feat_auto_pst *table;
+ u64 max_lat_us = 0;
+ int max_ps = -1;
+ int ret;
+
+ /*
+ * If APST isn't supported or if we haven't been initialized yet,
+ * then don't do anything.
+ */
+ if (!ctrl->apsta)
+ return 0;
+
+ if (ctrl->npss > 31) {
+ dev_warn(ctrl->device, "NPSS is invalid; not using APST\n");
+ return 0;
+ }
+
+ table = kzalloc(sizeof(*table), GFP_KERNEL);
+ if (!table)
+ return 0;
+
+ if (!ctrl->apst_enabled || ctrl->ps_max_latency_us == 0) {
+ /* Turn off APST. */
+ apste = 0;
+ dev_dbg(ctrl->device, "APST disabled\n");
+ } else {
+ __le64 target = cpu_to_le64(0);
+ int state;
+
+ /*
+ * Walk through all states from lowest- to highest-power.
+ * According to the spec, lower-numbered states use more
+ * power. NPSS, despite the name, is the index of the
+ * lowest-power state, not the number of states.
+ */
+ for (state = (int)ctrl->npss; state >= 0; state--) {
+ u64 total_latency_us, exit_latency_us, transition_ms;
+
+ if (target)
+ table->entries[state] = target;
+
+ /*
+ * Don't allow transitions to the deepest state
+ * if it's quirked off.
+ */
+ if (state == ctrl->npss &&
+ (ctrl->quirks & NVME_QUIRK_NO_DEEPEST_PS))
+ continue;
+
+ /*
+ * Is this state a useful non-operational state for
+ * higher-power states to autonomously transition to?
+ */
+ if (!(ctrl->psd[state].flags &
+ NVME_PS_FLAGS_NON_OP_STATE))
+ continue;
+
+ exit_latency_us =
+ (u64)le32_to_cpu(ctrl->psd[state].exit_lat);
+ if (exit_latency_us > ctrl->ps_max_latency_us)
+ continue;
+
+ total_latency_us =
+ exit_latency_us +
+ le32_to_cpu(ctrl->psd[state].entry_lat);
+
+ /*
+ * This state is good. Use it as the APST idle
+ * target for higher power states.
+ */
+ transition_ms = total_latency_us + 19;
+ do_div(transition_ms, 20);
+ if (transition_ms > (1 << 24) - 1)
+ transition_ms = (1 << 24) - 1;
+
+ target = cpu_to_le64((state << 3) |
+ (transition_ms << 8));
+
+ if (max_ps == -1)
+ max_ps = state;
+
+ if (total_latency_us > max_lat_us)
+ max_lat_us = total_latency_us;
+ }
+
+ apste = 1;
+
+ if (max_ps == -1) {
+ dev_dbg(ctrl->device, "APST enabled but no non-operational states are available\n");
+ } else {
+ dev_dbg(ctrl->device, "APST enabled: max PS = %d, max round-trip latency = %lluus, table = %*phN\n",
+ max_ps, max_lat_us, (int)sizeof(*table), table);
+ }
+ }
+
+ ret = nvme_set_features(ctrl, NVME_FEAT_AUTO_PST, apste,
+ table, sizeof(*table), NULL);
+ if (ret)
+ dev_err(ctrl->device, "failed to set APST feature (%d)\n", ret);
+
+ kfree(table);
+ return ret;
+}
+
+static void nvme_set_latency_tolerance(struct device *dev, s32 val)
+{
+ struct nvme_ctrl *ctrl = dev_get_drvdata(dev);
+ u64 latency;
+
+ switch (val) {
+ case PM_QOS_LATENCY_TOLERANCE_NO_CONSTRAINT:
+ case PM_QOS_LATENCY_ANY:
+ latency = U64_MAX;
+ break;
+
+ default:
+ latency = val;
+ }
+
+ if (ctrl->ps_max_latency_us != latency) {
+ ctrl->ps_max_latency_us = latency;
+ nvme_configure_apst(ctrl);
+ }
+}
+
+struct nvme_core_quirk_entry {
+ /*
+ * NVMe model and firmware strings are padded with spaces. For
+ * simplicity, strings in the quirk table are padded with NULLs
+ * instead.
+ */
+ u16 vid;
+ const char *mn;
+ const char *fr;
+ unsigned long quirks;
+};
+
+static const struct nvme_core_quirk_entry core_quirks[] = {
+ {
+ /*
+ * This Toshiba device seems to die using any APST states. See:
+ * https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1678184/comments/11
+ */
+ .vid = 0x1179,
+ .mn = "THNSF5256GPUK TOSHIBA",
+ .quirks = NVME_QUIRK_NO_APST,
+ }
+};
+
+/* match is null-terminated but idstr is space-padded. */
+static bool string_matches(const char *idstr, const char *match, size_t len)
+{
+ size_t matchlen;
+
+ if (!match)
+ return true;
+
+ matchlen = strlen(match);
+ WARN_ON_ONCE(matchlen > len);
+
+ if (memcmp(idstr, match, matchlen))
+ return false;
+
+ for (; matchlen < len; matchlen++)
+ if (idstr[matchlen] != ' ')
+ return false;
+
+ return true;
+}
+
+static bool quirk_matches(const struct nvme_id_ctrl *id,
+ const struct nvme_core_quirk_entry *q)
+{
+ return q->vid == le16_to_cpu(id->vid) &&
+ string_matches(id->mn, q->mn, sizeof(id->mn)) &&
+ string_matches(id->fr, q->fr, sizeof(id->fr));
+}
+
+static void nvme_init_subnqn(struct nvme_ctrl *ctrl, struct nvme_id_ctrl *id)
+{
+ size_t nqnlen;
+ int off;
+
+ nqnlen = strnlen(id->subnqn, NVMF_NQN_SIZE);
+ if (nqnlen > 0 && nqnlen < NVMF_NQN_SIZE) {
+ strcpy(ctrl->subnqn, id->subnqn);
+ return;
+ }
+
+ if (ctrl->vs >= NVME_VS(1, 2, 1))
+ dev_warn(ctrl->device, "missing or invalid SUBNQN field.\n");
+
+ /* Generate a "fake" NQN per Figure 254 in NVMe 1.3 + ECN 001 */
+ off = snprintf(ctrl->subnqn, NVMF_NQN_SIZE,
+ "nqn.2014.08.org.nvmexpress:%4x%4x",
+ le16_to_cpu(id->vid), le16_to_cpu(id->ssvid));
+ memcpy(ctrl->subnqn + off, id->sn, sizeof(id->sn));
+ off += sizeof(id->sn);
+ memcpy(ctrl->subnqn + off, id->mn, sizeof(id->mn));
+ off += sizeof(id->mn);
+ memset(ctrl->subnqn + off, 0, sizeof(ctrl->subnqn) - off);
+}
+
+/*
+ * Initialize the cached copies of the Identify data and various controller
+ * register in our nvme_ctrl structure. This should be called as soon as
+ * the admin queue is fully up and running.
+ */
+int nvme_init_identify(struct nvme_ctrl *ctrl)
+{
+ struct nvme_id_ctrl *id;
+ u64 cap;
+ int ret, page_shift;
+ u32 max_hw_sectors;
+ bool prev_apst_enabled;
+
+ ret = ctrl->ops->reg_read32(ctrl, NVME_REG_VS, &ctrl->vs);
+ if (ret) {
+ dev_err(ctrl->device, "Reading VS failed (%d)\n", ret);
+ return ret;
+ }
+
+ ret = ctrl->ops->reg_read64(ctrl, NVME_REG_CAP, &cap);
+ if (ret) {
+ dev_err(ctrl->device, "Reading CAP failed (%d)\n", ret);
+ return ret;
+ }
+ page_shift = NVME_CAP_MPSMIN(cap) + 12;
+
+ if (ctrl->vs >= NVME_VS(1, 1, 0))
+ ctrl->subsystem = NVME_CAP_NSSRC(cap);
+
+ ret = nvme_identify_ctrl(ctrl, &id);
+ if (ret) {
+ dev_err(ctrl->device, "Identify Controller failed (%d)\n", ret);
+ return -EIO;
+ }
+
+ nvme_init_subnqn(ctrl, id);
+
+ if (!ctrl->identified) {
+ /*
+ * Check for quirks. Quirk can depend on firmware version,
+ * so, in principle, the set of quirks present can change
+ * across a reset. As a possible future enhancement, we
+ * could re-scan for quirks every time we reinitialize
+ * the device, but we'd have to make sure that the driver
+ * behaves intelligently if the quirks change.
+ */
+
+ int i;
+
+ for (i = 0; i < ARRAY_SIZE(core_quirks); i++) {
+ if (quirk_matches(id, &core_quirks[i]))
+ ctrl->quirks |= core_quirks[i].quirks;
+ }
+ }
+
+ if (force_apst && (ctrl->quirks & NVME_QUIRK_NO_DEEPEST_PS)) {
+ dev_warn(ctrl->device, "forcibly allowing all power states due to nvme_core.force_apst -- use at your own risk\n");
+ ctrl->quirks &= ~NVME_QUIRK_NO_DEEPEST_PS;
+ }
+
+ ctrl->oacs = le16_to_cpu(id->oacs);
+ ctrl->vid = le16_to_cpu(id->vid);
+ ctrl->oncs = le16_to_cpup(&id->oncs);
+ atomic_set(&ctrl->abort_limit, id->acl + 1);
+ ctrl->vwc = id->vwc;
+ ctrl->cntlid = le16_to_cpup(&id->cntlid);
+ memcpy(ctrl->serial, id->sn, sizeof(id->sn));
+ memcpy(ctrl->model, id->mn, sizeof(id->mn));
+ memcpy(ctrl->firmware_rev, id->fr, sizeof(id->fr));
+ if (id->mdts)
+ max_hw_sectors = 1 << (id->mdts + page_shift - 9);
+ else
+ max_hw_sectors = UINT_MAX;
+ ctrl->max_hw_sectors =
+ min_not_zero(ctrl->max_hw_sectors, max_hw_sectors);
+
+ nvme_set_queue_limits(ctrl, ctrl->admin_q);
+ ctrl->sgls = le32_to_cpu(id->sgls);
+ ctrl->kas = le16_to_cpu(id->kas);
+
+ if (id->rtd3e) {
+ /* us -> s */
+ u32 transition_time = le32_to_cpu(id->rtd3e) / 1000000;
+
+ ctrl->shutdown_timeout = clamp_t(unsigned int, transition_time,
+ shutdown_timeout, 60);
+
+ if (ctrl->shutdown_timeout != shutdown_timeout)
+ dev_warn(ctrl->device,
+ "Shutdown timeout set to %u seconds\n",
+ ctrl->shutdown_timeout);
+ } else
+ ctrl->shutdown_timeout = shutdown_timeout;
+
+ ctrl->npss = id->npss;
+ ctrl->apsta = id->apsta;
+ prev_apst_enabled = ctrl->apst_enabled;
+ if (ctrl->quirks & NVME_QUIRK_NO_APST) {
+ if (force_apst && id->apsta) {
+ dev_warn(ctrl->device, "forcibly allowing APST due to nvme_core.force_apst -- use at your own risk\n");
+ ctrl->apst_enabled = true;
+ } else {
+ ctrl->apst_enabled = false;
+ }
+ } else {
+ ctrl->apst_enabled = id->apsta;
+ }
+ memcpy(ctrl->psd, id->psd, sizeof(ctrl->psd));
+
+ if (ctrl->ops->flags & NVME_F_FABRICS) {
+ ctrl->icdoff = le16_to_cpu(id->icdoff);
+ ctrl->ioccsz = le32_to_cpu(id->ioccsz);
+ ctrl->iorcsz = le32_to_cpu(id->iorcsz);
+ ctrl->maxcmd = le16_to_cpu(id->maxcmd);
+
+ /*
+ * In fabrics we need to verify the cntlid matches the
+ * admin connect
+ */
+ if (ctrl->cntlid != le16_to_cpu(id->cntlid)) {
+ ret = -EINVAL;
+ goto out_free;
+ }
+
+ if (!ctrl->opts->discovery_nqn && !ctrl->kas) {
+ dev_err(ctrl->device,
+ "keep-alive support is mandatory for fabrics\n");
+ ret = -EINVAL;
+ goto out_free;
+ }
+ } else {
+ ctrl->cntlid = le16_to_cpu(id->cntlid);
+ ctrl->hmpre = le32_to_cpu(id->hmpre);
+ ctrl->hmmin = le32_to_cpu(id->hmmin);
+ ctrl->hmminds = le32_to_cpu(id->hmminds);
+ ctrl->hmmaxd = le16_to_cpu(id->hmmaxd);
+ }
+
+ kfree(id);
+
+ if (ctrl->apst_enabled && !prev_apst_enabled)
+ dev_pm_qos_expose_latency_tolerance(ctrl->device);
+ else if (!ctrl->apst_enabled && prev_apst_enabled)
+ dev_pm_qos_hide_latency_tolerance(ctrl->device);
+
+ ret = nvme_configure_apst(ctrl);
+ if (ret < 0)
+ return ret;
+
+ ret = nvme_configure_timestamp(ctrl);
+ if (ret < 0)
+ return ret;
+
+ ret = nvme_configure_directives(ctrl);
+ if (ret < 0)
+ return ret;
+
+ ctrl->identified = true;
+
+ return 0;
+
+out_free:
+ kfree(id);
+ return ret;
+}
+EXPORT_SYMBOL_GPL(nvme_init_identify);
+
+static int nvme_dev_open(struct inode *inode, struct file *file)
+{
+ struct nvme_ctrl *ctrl;
+ int instance = iminor(inode);
+ int ret = -ENODEV;
+
+ spin_lock(&dev_list_lock);
+ list_for_each_entry(ctrl, &nvme_ctrl_list, node) {
+ if (ctrl->instance != instance)
+ continue;
+
+ if (!ctrl->admin_q) {
+ ret = -EWOULDBLOCK;
+ break;
+ }
+ if (!kref_get_unless_zero(&ctrl->kref))
+ break;
+ file->private_data = ctrl;
+ ret = 0;
+ break;
+ }
+ spin_unlock(&dev_list_lock);
+
+ return ret;
+}
+
+static int nvme_dev_release(struct inode *inode, struct file *file)
+{
+ nvme_put_ctrl(file->private_data);
+ return 0;
+}
+
+static int nvme_dev_user_cmd(struct nvme_ctrl *ctrl, void __user *argp)
+{
+ struct nvme_ns *ns;
+ int ret;
+
+ mutex_lock(&ctrl->namespaces_mutex);
+ if (list_empty(&ctrl->namespaces)) {
+ ret = -ENOTTY;
+ goto out_unlock;
+ }
+
+ ns = list_first_entry(&ctrl->namespaces, struct nvme_ns, list);
+ if (ns != list_last_entry(&ctrl->namespaces, struct nvme_ns, list)) {
+ dev_warn(ctrl->device,
+ "NVME_IOCTL_IO_CMD not supported when multiple namespaces present!\n");
+ ret = -EINVAL;
+ goto out_unlock;
+ }
+
+ dev_warn(ctrl->device,
+ "using deprecated NVME_IOCTL_IO_CMD ioctl on the char device!\n");
+ kref_get(&ns->kref);
+ mutex_unlock(&ctrl->namespaces_mutex);
+
+ ret = nvme_user_cmd(ctrl, ns, argp);
+ nvme_put_ns(ns);
+ return ret;
+
+out_unlock:
+ mutex_unlock(&ctrl->namespaces_mutex);
+ return ret;
+}
+
+static long nvme_dev_ioctl(struct file *file, unsigned int cmd,
+ unsigned long arg)
+{
+ struct nvme_ctrl *ctrl = file->private_data;
+ void __user *argp = (void __user *)arg;
+
+ switch (cmd) {
+ case NVME_IOCTL_ADMIN_CMD:
+ return nvme_user_cmd(ctrl, NULL, argp);
+ case NVME_IOCTL_IO_CMD:
+ return nvme_dev_user_cmd(ctrl, argp);
+ case NVME_IOCTL_RESET:
+ dev_warn(ctrl->device, "resetting controller\n");
+ return nvme_reset_ctrl_sync(ctrl);
+ case NVME_IOCTL_SUBSYS_RESET:
+ return nvme_reset_subsystem(ctrl);
+ case NVME_IOCTL_RESCAN:
+ nvme_queue_scan(ctrl);
+ return 0;
+ default:
+ return -ENOTTY;
+ }
+}
+
+static const struct file_operations nvme_dev_fops = {
+ .owner = THIS_MODULE,
+ .open = nvme_dev_open,
+ .release = nvme_dev_release,
+ .unlocked_ioctl = nvme_dev_ioctl,
+ .compat_ioctl = nvme_dev_ioctl,
+};
+
+static ssize_t nvme_sysfs_reset(struct device *dev,
+ struct device_attribute *attr, const char *buf,
+ size_t count)
+{
+ struct nvme_ctrl *ctrl = dev_get_drvdata(dev);
+ int ret;
+
+ ret = nvme_reset_ctrl_sync(ctrl);
+ if (ret < 0)
+ return ret;
+ return count;
+}
+static DEVICE_ATTR(reset_controller, S_IWUSR, NULL, nvme_sysfs_reset);
+
+static ssize_t nvme_sysfs_rescan(struct device *dev,
+ struct device_attribute *attr, const char *buf,
+ size_t count)
+{
+ struct nvme_ctrl *ctrl = dev_get_drvdata(dev);
+
+ nvme_queue_scan(ctrl);
+ return count;
+}
+static DEVICE_ATTR(rescan_controller, S_IWUSR, NULL, nvme_sysfs_rescan);
+
+static ssize_t wwid_show(struct device *dev, struct device_attribute *attr,
+ char *buf)
+{
+ struct nvme_ns *ns = nvme_get_ns_from_dev(dev);
+ struct nvme_ctrl *ctrl = ns->ctrl;
+ int serial_len = sizeof(ctrl->serial);
+ int model_len = sizeof(ctrl->model);
+
+ if (!uuid_is_null(&ns->uuid))
+ return sprintf(buf, "uuid.%pU\n", &ns->uuid);
+
+ if (memchr_inv(ns->nguid, 0, sizeof(ns->nguid)))
+ return sprintf(buf, "eui.%16phN\n", ns->nguid);
+
+ if (memchr_inv(ns->eui, 0, sizeof(ns->eui)))
+ return sprintf(buf, "eui.%8phN\n", ns->eui);
+
+ while (serial_len > 0 && (ctrl->serial[serial_len - 1] == ' ' ||
+ ctrl->serial[serial_len - 1] == '\0'))
+ serial_len--;
+ while (model_len > 0 && (ctrl->model[model_len - 1] == ' ' ||
+ ctrl->model[model_len - 1] == '\0'))
+ model_len--;
+
+ return sprintf(buf, "nvme.%04x-%*phN-%*phN-%08x\n", ctrl->vid,
+ serial_len, ctrl->serial, model_len, ctrl->model, ns->ns_id);
+}
+static DEVICE_ATTR(wwid, S_IRUGO, wwid_show, NULL);
+
+static ssize_t nguid_show(struct device *dev, struct device_attribute *attr,
+ char *buf)
+{
+ struct nvme_ns *ns = nvme_get_ns_from_dev(dev);
+ return sprintf(buf, "%pU\n", ns->nguid);
+}
+static DEVICE_ATTR(nguid, S_IRUGO, nguid_show, NULL);
+
+static ssize_t uuid_show(struct device *dev, struct device_attribute *attr,
+ char *buf)
+{
+ struct nvme_ns *ns = nvme_get_ns_from_dev(dev);
+
+ /* For backward compatibility expose the NGUID to userspace if
+ * we have no UUID set
+ */
+ if (uuid_is_null(&ns->uuid)) {
+ printk_ratelimited(KERN_WARNING
+ "No UUID available providing old NGUID\n");
+ return sprintf(buf, "%pU\n", ns->nguid);
+ }
+ return sprintf(buf, "%pU\n", &ns->uuid);
+}
+static DEVICE_ATTR(uuid, S_IRUGO, uuid_show, NULL);
+
+static ssize_t eui_show(struct device *dev, struct device_attribute *attr,
+ char *buf)
+{
+ struct nvme_ns *ns = nvme_get_ns_from_dev(dev);
+ return sprintf(buf, "%8phd\n", ns->eui);
+}
+static DEVICE_ATTR(eui, S_IRUGO, eui_show, NULL);
+
+static ssize_t nsid_show(struct device *dev, struct device_attribute *attr,
+ char *buf)
+{
+ struct nvme_ns *ns = nvme_get_ns_from_dev(dev);
+ return sprintf(buf, "%d\n", ns->ns_id);
+}
+static DEVICE_ATTR(nsid, S_IRUGO, nsid_show, NULL);
+
+static struct attribute *nvme_ns_attrs[] = {
+ &dev_attr_wwid.attr,
+ &dev_attr_uuid.attr,
+ &dev_attr_nguid.attr,
+ &dev_attr_eui.attr,
+ &dev_attr_nsid.attr,
+ NULL,
+};
+
+static umode_t nvme_ns_attrs_are_visible(struct kobject *kobj,
+ struct attribute *a, int n)
+{
+ struct device *dev = container_of(kobj, struct device, kobj);
+ struct nvme_ns *ns = nvme_get_ns_from_dev(dev);
+
+ if (a == &dev_attr_uuid.attr) {
+ if (uuid_is_null(&ns->uuid) &&
+ !memchr_inv(ns->nguid, 0, sizeof(ns->nguid)))
+ return 0;
+ }
+ if (a == &dev_attr_nguid.attr) {
+ if (!memchr_inv(ns->nguid, 0, sizeof(ns->nguid)))
+ return 0;
+ }
+ if (a == &dev_attr_eui.attr) {
+ if (!memchr_inv(ns->eui, 0, sizeof(ns->eui)))
+ return 0;
+ }
+ return a->mode;
+}
+
+static const struct attribute_group nvme_ns_attr_group = {
+ .attrs = nvme_ns_attrs,
+ .is_visible = nvme_ns_attrs_are_visible,
+};
+
+#define nvme_show_str_function(field) \
+static ssize_t field##_show(struct device *dev, \
+ struct device_attribute *attr, char *buf) \
+{ \
+ struct nvme_ctrl *ctrl = dev_get_drvdata(dev); \
+ return sprintf(buf, "%.*s\n", (int)sizeof(ctrl->field), ctrl->field); \
+} \
+static DEVICE_ATTR(field, S_IRUGO, field##_show, NULL);
+
+#define nvme_show_int_function(field) \
+static ssize_t field##_show(struct device *dev, \
+ struct device_attribute *attr, char *buf) \
+{ \
+ struct nvme_ctrl *ctrl = dev_get_drvdata(dev); \
+ return sprintf(buf, "%d\n", ctrl->field); \
+} \
+static DEVICE_ATTR(field, S_IRUGO, field##_show, NULL);
+
+nvme_show_str_function(model);
+nvme_show_str_function(serial);
+nvme_show_str_function(firmware_rev);
+nvme_show_int_function(cntlid);
+
+static ssize_t nvme_sysfs_delete(struct device *dev,
+ struct device_attribute *attr, const char *buf,
+ size_t count)
+{
+ struct nvme_ctrl *ctrl = dev_get_drvdata(dev);
+
+ if (device_remove_file_self(dev, attr))
+ ctrl->ops->delete_ctrl(ctrl);
+ return count;
+}
+static DEVICE_ATTR(delete_controller, S_IWUSR, NULL, nvme_sysfs_delete);
+
+static ssize_t nvme_sysfs_show_transport(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct nvme_ctrl *ctrl = dev_get_drvdata(dev);
+
+ return snprintf(buf, PAGE_SIZE, "%s\n", ctrl->ops->name);
+}
+static DEVICE_ATTR(transport, S_IRUGO, nvme_sysfs_show_transport, NULL);
+
+static ssize_t nvme_sysfs_show_state(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct nvme_ctrl *ctrl = dev_get_drvdata(dev);
+ static const char *const state_name[] = {
+ [NVME_CTRL_NEW] = "new",
+ [NVME_CTRL_LIVE] = "live",
+ [NVME_CTRL_RESETTING] = "resetting",
+ [NVME_CTRL_RECONNECTING]= "reconnecting",
+ [NVME_CTRL_DELETING] = "deleting",
+ [NVME_CTRL_DEAD] = "dead",
+ };
+
+ if ((unsigned)ctrl->state < ARRAY_SIZE(state_name) &&
+ state_name[ctrl->state])
+ return sprintf(buf, "%s\n", state_name[ctrl->state]);
+
+ return sprintf(buf, "unknown state\n");
+}
+
+static DEVICE_ATTR(state, S_IRUGO, nvme_sysfs_show_state, NULL);
+
+static ssize_t nvme_sysfs_show_subsysnqn(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct nvme_ctrl *ctrl = dev_get_drvdata(dev);
+
+ return snprintf(buf, PAGE_SIZE, "%s\n", ctrl->subnqn);
+}
+static DEVICE_ATTR(subsysnqn, S_IRUGO, nvme_sysfs_show_subsysnqn, NULL);
+
+static ssize_t nvme_sysfs_show_address(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct nvme_ctrl *ctrl = dev_get_drvdata(dev);
+
+ return ctrl->ops->get_address(ctrl, buf, PAGE_SIZE);
+}
+static DEVICE_ATTR(address, S_IRUGO, nvme_sysfs_show_address, NULL);
+
+static struct attribute *nvme_dev_attrs[] = {
+ &dev_attr_reset_controller.attr,
+ &dev_attr_rescan_controller.attr,
+ &dev_attr_model.attr,
+ &dev_attr_serial.attr,
+ &dev_attr_firmware_rev.attr,
+ &dev_attr_cntlid.attr,
+ &dev_attr_delete_controller.attr,
+ &dev_attr_transport.attr,
+ &dev_attr_subsysnqn.attr,
+ &dev_attr_address.attr,
+ &dev_attr_state.attr,
+ NULL
+};
+
+static umode_t nvme_dev_attrs_are_visible(struct kobject *kobj,
+ struct attribute *a, int n)
+{
+ struct device *dev = container_of(kobj, struct device, kobj);
+ struct nvme_ctrl *ctrl = dev_get_drvdata(dev);
+
+ if (a == &dev_attr_delete_controller.attr && !ctrl->ops->delete_ctrl)
+ return 0;
+ if (a == &dev_attr_address.attr && !ctrl->ops->get_address)
+ return 0;
+
+ return a->mode;
+}
+
+static struct attribute_group nvme_dev_attrs_group = {
+ .attrs = nvme_dev_attrs,
+ .is_visible = nvme_dev_attrs_are_visible,
+};
+
+static const struct attribute_group *nvme_dev_attr_groups[] = {
+ &nvme_dev_attrs_group,
+ NULL,
+};
+
+static int ns_cmp(void *priv, struct list_head *a, struct list_head *b)
+{
+ struct nvme_ns *nsa = container_of(a, struct nvme_ns, list);
+ struct nvme_ns *nsb = container_of(b, struct nvme_ns, list);
+
+ return nsa->ns_id - nsb->ns_id;
+}
+
+static struct nvme_ns *nvme_find_get_ns(struct nvme_ctrl *ctrl, unsigned nsid)
+{
+ struct nvme_ns *ns, *ret = NULL;
+
+ mutex_lock(&ctrl->namespaces_mutex);
+ list_for_each_entry(ns, &ctrl->namespaces, list) {
+ if (ns->ns_id == nsid) {
+ if (!kref_get_unless_zero(&ns->kref))
+ continue;
+ ret = ns;
+ break;
+ }
+ if (ns->ns_id > nsid)
+ break;
+ }
+ mutex_unlock(&ctrl->namespaces_mutex);
+ return ret;
+}
+
+static int nvme_setup_streams_ns(struct nvme_ctrl *ctrl, struct nvme_ns *ns)
+{
+ struct streams_directive_params s;
+ int ret;
+
+ if (!ctrl->nr_streams)
+ return 0;
+
+ ret = nvme_get_stream_params(ctrl, &s, ns->ns_id);
+ if (ret)
+ return ret;
+
+ ns->sws = le32_to_cpu(s.sws);
+ ns->sgs = le16_to_cpu(s.sgs);
+
+ if (ns->sws) {
+ unsigned int bs = 1 << ns->lba_shift;
+
+ blk_queue_io_min(ns->queue, bs * ns->sws);
+ if (ns->sgs)
+ blk_queue_io_opt(ns->queue, bs * ns->sws * ns->sgs);
+ }
+
+ return 0;
+}
+
+static void nvme_alloc_ns(struct nvme_ctrl *ctrl, unsigned nsid)
+{
+ struct nvme_ns *ns;
+ struct gendisk *disk;
+ struct nvme_id_ns *id;
+ char disk_name[DISK_NAME_LEN];
+ int node = dev_to_node(ctrl->dev);
+
+ ns = kzalloc_node(sizeof(*ns), GFP_KERNEL, node);
+ if (!ns)
+ return;
+
+ ns->instance = ida_simple_get(&ctrl->ns_ida, 1, 0, GFP_KERNEL);
+ if (ns->instance < 0)
+ goto out_free_ns;
+
+ ns->queue = blk_mq_init_queue(ctrl->tagset);
+ if (IS_ERR(ns->queue))
+ goto out_release_instance;
+ queue_flag_set_unlocked(QUEUE_FLAG_NONROT, ns->queue);
+ ns->queue->queuedata = ns;
+ ns->ctrl = ctrl;
+
+ kref_init(&ns->kref);
+ ns->ns_id = nsid;
+ ns->lba_shift = 9; /* set to a default value for 512 until disk is validated */
+
+ blk_queue_logical_block_size(ns->queue, 1 << ns->lba_shift);
+ nvme_set_queue_limits(ctrl, ns->queue);
+ nvme_setup_streams_ns(ctrl, ns);
+
+ sprintf(disk_name, "nvme%dn%d", ctrl->instance, ns->instance);
+
+ id = nvme_identify_ns(ctrl, nsid);
+ if (!id)
+ goto out_free_queue;
+
+ if (id->ncap == 0)
+ goto out_free_id;
+
+ nvme_report_ns_ids(ctrl, ns->ns_id, id, ns->eui, ns->nguid, &ns->uuid);
+
+ if ((ctrl->quirks & NVME_QUIRK_LIGHTNVM) && id->vs[0] == 0x1) {
+ if (nvme_nvm_register(ns, disk_name, node)) {
+ dev_warn(ctrl->device, "LightNVM init failure\n");
+ goto out_free_id;
+ }
+ }
+
+ disk = alloc_disk_node(0, node);
+ if (!disk)
+ goto out_free_id;
+
+ disk->fops = &nvme_fops;
+ disk->private_data = ns;
+ disk->queue = ns->queue;
+ disk->flags = GENHD_FL_EXT_DEVT;
+ memcpy(disk->disk_name, disk_name, DISK_NAME_LEN);
+ ns->disk = disk;
+
+ __nvme_revalidate_disk(disk, id);
+
+ mutex_lock(&ctrl->namespaces_mutex);
+ list_add_tail(&ns->list, &ctrl->namespaces);
+ mutex_unlock(&ctrl->namespaces_mutex);
+
+ kref_get(&ctrl->kref);
+
+ kfree(id);
+
+ device_add_disk(ctrl->device, ns->disk);
+ if (sysfs_create_group(&disk_to_dev(ns->disk)->kobj,
+ &nvme_ns_attr_group))
+ pr_warn("%s: failed to create sysfs group for identification\n",
+ ns->disk->disk_name);
+ if (ns->ndev && nvme_nvm_register_sysfs(ns))
+ pr_warn("%s: failed to register lightnvm sysfs group for identification\n",
+ ns->disk->disk_name);
+ return;
+ out_free_id:
+ kfree(id);
+ out_free_queue:
+ blk_cleanup_queue(ns->queue);
+ out_release_instance:
+ ida_simple_remove(&ctrl->ns_ida, ns->instance);
+ out_free_ns:
+ kfree(ns);
+}
+
+static void nvme_ns_remove(struct nvme_ns *ns)
+{
+ if (test_and_set_bit(NVME_NS_REMOVING, &ns->flags))
+ return;
+
+ if (ns->disk && ns->disk->flags & GENHD_FL_UP) {
+ if (blk_get_integrity(ns->disk))
+ blk_integrity_unregister(ns->disk);
+ sysfs_remove_group(&disk_to_dev(ns->disk)->kobj,
+ &nvme_ns_attr_group);
+ if (ns->ndev)
+ nvme_nvm_unregister_sysfs(ns);
+ del_gendisk(ns->disk);
+ blk_cleanup_queue(ns->queue);
+ }
+
+ mutex_lock(&ns->ctrl->namespaces_mutex);
+ list_del_init(&ns->list);
+ mutex_unlock(&ns->ctrl->namespaces_mutex);
+
+ nvme_put_ns(ns);
+}
+
+static void nvme_validate_ns(struct nvme_ctrl *ctrl, unsigned nsid)
+{
+ struct nvme_ns *ns;
+
+ ns = nvme_find_get_ns(ctrl, nsid);
+ if (ns) {
+ if (ns->disk && revalidate_disk(ns->disk))
+ nvme_ns_remove(ns);
+ nvme_put_ns(ns);
+ } else
+ nvme_alloc_ns(ctrl, nsid);
+}
+
+static void nvme_remove_invalid_namespaces(struct nvme_ctrl *ctrl,
+ unsigned nsid)
+{
+ struct nvme_ns *ns, *next;
+
+ list_for_each_entry_safe(ns, next, &ctrl->namespaces, list) {
+ if (ns->ns_id > nsid)
+ nvme_ns_remove(ns);
+ }
+}
+
+static int nvme_scan_ns_list(struct nvme_ctrl *ctrl, unsigned nn)
+{
+ struct nvme_ns *ns;
+ __le32 *ns_list;
+ unsigned i, j, nsid, prev = 0;
+ unsigned num_lists = DIV_ROUND_UP_ULL((u64)nn, 1024);
+ int ret = 0;
+
+ ns_list = kzalloc(0x1000, GFP_KERNEL);
+ if (!ns_list)
+ return -ENOMEM;
+
+ for (i = 0; i < num_lists; i++) {
+ ret = nvme_identify_ns_list(ctrl, prev, ns_list);
+ if (ret)
+ goto free;
+
+ for (j = 0; j < min(nn, 1024U); j++) {
+ nsid = le32_to_cpu(ns_list[j]);
+ if (!nsid)
+ goto out;
+
+ nvme_validate_ns(ctrl, nsid);
+
+ while (++prev < nsid) {
+ ns = nvme_find_get_ns(ctrl, prev);
+ if (ns) {
+ nvme_ns_remove(ns);
+ nvme_put_ns(ns);
+ }
+ }
+ }
+ nn -= j;
+ }
+ out:
+ nvme_remove_invalid_namespaces(ctrl, prev);
+ free:
+ kfree(ns_list);
+ return ret;
+}
+
+static void nvme_scan_ns_sequential(struct nvme_ctrl *ctrl, unsigned nn)
+{
+ unsigned i;
+
+ for (i = 1; i <= nn; i++)
+ nvme_validate_ns(ctrl, i);
+
+ nvme_remove_invalid_namespaces(ctrl, nn);
+}
+
+static void nvme_scan_work(struct work_struct *work)
+{
+ struct nvme_ctrl *ctrl =
+ container_of(work, struct nvme_ctrl, scan_work);
+ struct nvme_id_ctrl *id;
+ unsigned nn;
+
+ if (ctrl->state != NVME_CTRL_LIVE)
+ return;
+
+ if (nvme_identify_ctrl(ctrl, &id))
+ return;
+
+ nn = le32_to_cpu(id->nn);
+ if (!nvme_ctrl_limited_cns(ctrl)) {
+ if (!nvme_scan_ns_list(ctrl, nn))
+ goto done;
+ }
+ nvme_scan_ns_sequential(ctrl, nn);
+ done:
+ mutex_lock(&ctrl->namespaces_mutex);
+ list_sort(NULL, &ctrl->namespaces, ns_cmp);
+ mutex_unlock(&ctrl->namespaces_mutex);
+ kfree(id);
+}
+
+void nvme_queue_scan(struct nvme_ctrl *ctrl)
+{
+ /*
+ * Do not queue new scan work when a controller is reset during
+ * removal.
+ */
+ if (ctrl->state == NVME_CTRL_LIVE)
+ queue_work(nvme_wq, &ctrl->scan_work);
+}
+EXPORT_SYMBOL_GPL(nvme_queue_scan);
+
+/*
+ * This function iterates the namespace list unlocked to allow recovery from
+ * controller failure. It is up to the caller to ensure the namespace list is
+ * not modified by scan work while this function is executing.
+ */
+void nvme_remove_namespaces(struct nvme_ctrl *ctrl)
+{
+ struct nvme_ns *ns, *next;
+
+ /* prevent racing with ns scanning */
+ flush_work(&ctrl->scan_work);
+
+ /*
+ * The dead states indicates the controller was not gracefully
+ * disconnected. In that case, we won't be able to flush any data while
+ * removing the namespaces' disks; fail all the queues now to avoid
+ * potentially having to clean up the failed sync later.
+ */
+ if (ctrl->state == NVME_CTRL_DEAD)
+ nvme_kill_queues(ctrl);
+
+ list_for_each_entry_safe(ns, next, &ctrl->namespaces, list)
+ nvme_ns_remove(ns);
+}
+EXPORT_SYMBOL_GPL(nvme_remove_namespaces);
+
+static void nvme_async_event_work(struct work_struct *work)
+{
+ struct nvme_ctrl *ctrl =
+ container_of(work, struct nvme_ctrl, async_event_work);
+
+ spin_lock_irq(&ctrl->lock);
+ while (ctrl->state == NVME_CTRL_LIVE && ctrl->event_limit > 0) {
+ int aer_idx = --ctrl->event_limit;
+
+ spin_unlock_irq(&ctrl->lock);
+ ctrl->ops->submit_async_event(ctrl, aer_idx);
+ spin_lock_irq(&ctrl->lock);
+ }
+ spin_unlock_irq(&ctrl->lock);
+}
+
+static bool nvme_ctrl_pp_status(struct nvme_ctrl *ctrl)
+{
+
+ u32 csts;
+
+ if (ctrl->ops->reg_read32(ctrl, NVME_REG_CSTS, &csts))
+ return false;
+
+ if (csts == ~0)
+ return false;
+
+ return ((ctrl->ctrl_config & NVME_CC_ENABLE) && (csts & NVME_CSTS_PP));
+}
+
+static void nvme_get_fw_slot_info(struct nvme_ctrl *ctrl)
+{
+ struct nvme_command c = { };
+ struct nvme_fw_slot_info_log *log;
+
+ log = kmalloc(sizeof(*log), GFP_KERNEL);
+ if (!log)
+ return;
+
+ c.common.opcode = nvme_admin_get_log_page;
+ c.common.nsid = cpu_to_le32(NVME_NSID_ALL);
+ c.common.cdw10[0] = nvme_get_log_dw10(NVME_LOG_FW_SLOT, sizeof(*log));
+
+ if (!nvme_submit_sync_cmd(ctrl->admin_q, &c, log, sizeof(*log)))
+ dev_warn(ctrl->device,
+ "Get FW SLOT INFO log error\n");
+ kfree(log);
+}
+
+static void nvme_fw_act_work(struct work_struct *work)
+{
+ struct nvme_ctrl *ctrl = container_of(work,
+ struct nvme_ctrl, fw_act_work);
+ unsigned long fw_act_timeout;
+
+ if (ctrl->mtfa)
+ fw_act_timeout = jiffies +
+ msecs_to_jiffies(ctrl->mtfa * 100);
+ else
+ fw_act_timeout = jiffies +
+ msecs_to_jiffies(admin_timeout * 1000);
+
+ nvme_stop_queues(ctrl);
+ while (nvme_ctrl_pp_status(ctrl)) {
+ if (time_after(jiffies, fw_act_timeout)) {
+ dev_warn(ctrl->device,
+ "Fw activation timeout, reset controller\n");
+ nvme_reset_ctrl(ctrl);
+ break;
+ }
+ msleep(100);
+ }
+
+ if (ctrl->state != NVME_CTRL_LIVE)
+ return;
+
+ nvme_start_queues(ctrl);
+ /* read FW slot informationi to clear the AER*/
+ nvme_get_fw_slot_info(ctrl);
+}
+
+void nvme_complete_async_event(struct nvme_ctrl *ctrl, __le16 status,
+ union nvme_result *res)
+{
+ u32 result = le32_to_cpu(res->u32);
+ bool done = true;
+
+ switch (le16_to_cpu(status) >> 1) {
+ case NVME_SC_SUCCESS:
+ done = false;
+ /*FALLTHRU*/
+ case NVME_SC_ABORT_REQ:
+ ++ctrl->event_limit;
+ if (ctrl->state == NVME_CTRL_LIVE)
+ queue_work(nvme_wq, &ctrl->async_event_work);
+ break;
+ default:
+ break;
+ }
+
+ if (done)
+ return;
+
+ switch (result & 0xff07) {
+ case NVME_AER_NOTICE_NS_CHANGED:
+ dev_info(ctrl->device, "rescanning\n");
+ nvme_queue_scan(ctrl);
+ break;
+ case NVME_AER_NOTICE_FW_ACT_STARTING:
+ queue_work(nvme_wq, &ctrl->fw_act_work);
+ break;
+ default:
+ dev_warn(ctrl->device, "async event result %08x\n", result);
+ }
+}
+EXPORT_SYMBOL_GPL(nvme_complete_async_event);
+
+void nvme_queue_async_events(struct nvme_ctrl *ctrl)
+{
+ ctrl->event_limit = NVME_NR_AERS;
+ queue_work(nvme_wq, &ctrl->async_event_work);
+}
+EXPORT_SYMBOL_GPL(nvme_queue_async_events);
+
+static DEFINE_IDA(nvme_instance_ida);
+
+static int nvme_set_instance(struct nvme_ctrl *ctrl)
+{
+ int instance, error;
+
+ do {
+ if (!ida_pre_get(&nvme_instance_ida, GFP_KERNEL))
+ return -ENODEV;
+
+ spin_lock(&dev_list_lock);
+ error = ida_get_new(&nvme_instance_ida, &instance);
+ spin_unlock(&dev_list_lock);
+ } while (error == -EAGAIN);
+
+ if (error)
+ return -ENODEV;
+
+ ctrl->instance = instance;
+ return 0;
+}
+
+static void nvme_release_instance(struct nvme_ctrl *ctrl)
+{
+ spin_lock(&dev_list_lock);
+ ida_remove(&nvme_instance_ida, ctrl->instance);
+ spin_unlock(&dev_list_lock);
+}
+
+void nvme_stop_ctrl(struct nvme_ctrl *ctrl)
+{
+ nvme_stop_keep_alive(ctrl);
+ flush_work(&ctrl->async_event_work);
+ cancel_work_sync(&ctrl->fw_act_work);
+}
+EXPORT_SYMBOL_GPL(nvme_stop_ctrl);
+
+void nvme_start_ctrl(struct nvme_ctrl *ctrl)
+{
+ if (ctrl->kato)
+ nvme_start_keep_alive(ctrl);
+
+ if (ctrl->queue_count > 1) {
+ nvme_queue_scan(ctrl);
+ nvme_queue_async_events(ctrl);
+ nvme_start_queues(ctrl);
+ }
+}
+EXPORT_SYMBOL_GPL(nvme_start_ctrl);
+
+void nvme_uninit_ctrl(struct nvme_ctrl *ctrl)
+{
+ device_destroy(nvme_class, MKDEV(nvme_char_major, ctrl->instance));
+
+ spin_lock(&dev_list_lock);
+ list_del(&ctrl->node);
+ spin_unlock(&dev_list_lock);
+}
+EXPORT_SYMBOL_GPL(nvme_uninit_ctrl);
+
+static void nvme_free_ctrl(struct kref *kref)
+{
+ struct nvme_ctrl *ctrl = container_of(kref, struct nvme_ctrl, kref);
+
+ put_device(ctrl->device);
+ nvme_release_instance(ctrl);
+ ida_destroy(&ctrl->ns_ida);
+
+ ctrl->ops->free_ctrl(ctrl);
+}
+
+void nvme_put_ctrl(struct nvme_ctrl *ctrl)
+{
+ kref_put(&ctrl->kref, nvme_free_ctrl);
+}
+EXPORT_SYMBOL_GPL(nvme_put_ctrl);
+
+/*
+ * Initialize a NVMe controller structures. This needs to be called during
+ * earliest initialization so that we have the initialized structured around
+ * during probing.
+ */
+int nvme_init_ctrl(struct nvme_ctrl *ctrl, struct device *dev,
+ const struct nvme_ctrl_ops *ops, unsigned long quirks)
+{
+ int ret;
+
+ ctrl->state = NVME_CTRL_NEW;
+ spin_lock_init(&ctrl->lock);
+ INIT_LIST_HEAD(&ctrl->namespaces);
+ mutex_init(&ctrl->namespaces_mutex);
+ kref_init(&ctrl->kref);
+ ctrl->dev = dev;
+ ctrl->ops = ops;
+ ctrl->quirks = quirks;
+ INIT_WORK(&ctrl->scan_work, nvme_scan_work);
+ INIT_WORK(&ctrl->async_event_work, nvme_async_event_work);
+ INIT_WORK(&ctrl->fw_act_work, nvme_fw_act_work);
+
+ ret = nvme_set_instance(ctrl);
+ if (ret)
+ goto out;
+
+ ctrl->device = device_create_with_groups(nvme_class, ctrl->dev,
+ MKDEV(nvme_char_major, ctrl->instance),
+ ctrl, nvme_dev_attr_groups,
+ "nvme%d", ctrl->instance);
+ if (IS_ERR(ctrl->device)) {
+ ret = PTR_ERR(ctrl->device);
+ goto out_release_instance;
+ }
+ get_device(ctrl->device);
+ ida_init(&ctrl->ns_ida);
+
+ spin_lock(&dev_list_lock);
+ list_add_tail(&ctrl->node, &nvme_ctrl_list);
+ spin_unlock(&dev_list_lock);
+
+ /*
+ * Initialize latency tolerance controls. The sysfs files won't
+ * be visible to userspace unless the device actually supports APST.
+ */
+ ctrl->device->power.set_latency_tolerance = nvme_set_latency_tolerance;
+ dev_pm_qos_update_user_latency_tolerance(ctrl->device,
+ min(default_ps_max_latency_us, (unsigned long)S32_MAX));
+
+ return 0;
+out_release_instance:
+ nvme_release_instance(ctrl);
+out:
+ return ret;
+}
+EXPORT_SYMBOL_GPL(nvme_init_ctrl);
+
+/**
+ * nvme_kill_queues(): Ends all namespace queues
+ * @ctrl: the dead controller that needs to end
+ *
+ * Call this function when the driver determines it is unable to get the
+ * controller in a state capable of servicing IO.
+ */
+void nvme_kill_queues(struct nvme_ctrl *ctrl)
+{
+ struct nvme_ns *ns;
+
+ mutex_lock(&ctrl->namespaces_mutex);
+
+ /* Forcibly unquiesce queues to avoid blocking dispatch */
+ if (ctrl->admin_q)
+ blk_mq_unquiesce_queue(ctrl->admin_q);
+
+ list_for_each_entry(ns, &ctrl->namespaces, list) {
+ /*
+ * Revalidating a dead namespace sets capacity to 0. This will
+ * end buffered writers dirtying pages that can't be synced.
+ */
+ if (!ns->disk || test_and_set_bit(NVME_NS_DEAD, &ns->flags))
+ continue;
+ revalidate_disk(ns->disk);
+ blk_set_queue_dying(ns->queue);
+
+ /* Forcibly unquiesce queues to avoid blocking dispatch */
+ blk_mq_unquiesce_queue(ns->queue);
+ }
+ mutex_unlock(&ctrl->namespaces_mutex);
+}
+EXPORT_SYMBOL_GPL(nvme_kill_queues);
+
+void nvme_unfreeze(struct nvme_ctrl *ctrl)
+{
+ struct nvme_ns *ns;
+
+ mutex_lock(&ctrl->namespaces_mutex);
+ list_for_each_entry(ns, &ctrl->namespaces, list)
+ blk_mq_unfreeze_queue(ns->queue);
+ mutex_unlock(&ctrl->namespaces_mutex);
+}
+EXPORT_SYMBOL_GPL(nvme_unfreeze);
+
+void nvme_wait_freeze_timeout(struct nvme_ctrl *ctrl, long timeout)
+{
+ struct nvme_ns *ns;
+
+ mutex_lock(&ctrl->namespaces_mutex);
+ list_for_each_entry(ns, &ctrl->namespaces, list) {
+ timeout = blk_mq_freeze_queue_wait_timeout(ns->queue, timeout);
+ if (timeout <= 0)
+ break;
+ }
+ mutex_unlock(&ctrl->namespaces_mutex);
+}
+EXPORT_SYMBOL_GPL(nvme_wait_freeze_timeout);
+
+void nvme_wait_freeze(struct nvme_ctrl *ctrl)
+{
+ struct nvme_ns *ns;
+
+ mutex_lock(&ctrl->namespaces_mutex);
+ list_for_each_entry(ns, &ctrl->namespaces, list)
+ blk_mq_freeze_queue_wait(ns->queue);
+ mutex_unlock(&ctrl->namespaces_mutex);
+}
+EXPORT_SYMBOL_GPL(nvme_wait_freeze);
+
+void nvme_start_freeze(struct nvme_ctrl *ctrl)
+{
+ struct nvme_ns *ns;
+
+ mutex_lock(&ctrl->namespaces_mutex);
+ list_for_each_entry(ns, &ctrl->namespaces, list)
+ blk_freeze_queue_start(ns->queue);
+ mutex_unlock(&ctrl->namespaces_mutex);
+}
+EXPORT_SYMBOL_GPL(nvme_start_freeze);
+
+void nvme_stop_queues(struct nvme_ctrl *ctrl)
+{
+ struct nvme_ns *ns;
+
+ mutex_lock(&ctrl->namespaces_mutex);
+ list_for_each_entry(ns, &ctrl->namespaces, list)
+ blk_mq_quiesce_queue(ns->queue);
+ mutex_unlock(&ctrl->namespaces_mutex);
+}
+EXPORT_SYMBOL_GPL(nvme_stop_queues);
+
+void nvme_start_queues(struct nvme_ctrl *ctrl)
+{
+ struct nvme_ns *ns;
+
+ mutex_lock(&ctrl->namespaces_mutex);
+ list_for_each_entry(ns, &ctrl->namespaces, list)
+ blk_mq_unquiesce_queue(ns->queue);
+ mutex_unlock(&ctrl->namespaces_mutex);
+}
+EXPORT_SYMBOL_GPL(nvme_start_queues);
+
+int __init nvme_core_init(void)
+{
+ int result;
+
+ nvme_wq = alloc_workqueue("nvme-wq",
+ WQ_UNBOUND | WQ_MEM_RECLAIM | WQ_SYSFS, 0);
+ if (!nvme_wq)
+ return -ENOMEM;
+
+ result = __register_chrdev(nvme_char_major, 0, NVME_MINORS, "nvme",
+ &nvme_dev_fops);
+ if (result < 0)
+ goto destroy_wq;
+ else if (result > 0)
+ nvme_char_major = result;
+
+ nvme_class = class_create(THIS_MODULE, "nvme");
+ if (IS_ERR(nvme_class)) {
+ result = PTR_ERR(nvme_class);
+ goto unregister_chrdev;
+ }
+
+ return 0;
+
+unregister_chrdev:
+ __unregister_chrdev(nvme_char_major, 0, NVME_MINORS, "nvme");
+destroy_wq:
+ destroy_workqueue(nvme_wq);
+ return result;
+}
+
+void nvme_core_exit(void)
+{
+ class_destroy(nvme_class);
+ __unregister_chrdev(nvme_char_major, 0, NVME_MINORS, "nvme");
+ destroy_workqueue(nvme_wq);
+}
+
+MODULE_LICENSE("GPL");
+MODULE_VERSION("1.0");
+module_init(nvme_core_init);
+module_exit(nvme_core_exit);
diff --git a/src/kernel/linux/v4.14/drivers/nvme/host/fabrics.c b/src/kernel/linux/v4.14/drivers/nvme/host/fabrics.c
new file mode 100644
index 0000000..33d060c
--- /dev/null
+++ b/src/kernel/linux/v4.14/drivers/nvme/host/fabrics.c
@@ -0,0 +1,1054 @@
+/*
+ * NVMe over Fabrics common host code.
+ * Copyright (c) 2015-2016 HGST, a Western Digital Company.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ */
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+#include <linux/init.h>
+#include <linux/miscdevice.h>
+#include <linux/module.h>
+#include <linux/mutex.h>
+#include <linux/parser.h>
+#include <linux/seq_file.h>
+#include "nvme.h"
+#include "fabrics.h"
+
+static LIST_HEAD(nvmf_transports);
+static DECLARE_RWSEM(nvmf_transports_rwsem);
+
+static LIST_HEAD(nvmf_hosts);
+static DEFINE_MUTEX(nvmf_hosts_mutex);
+
+static struct nvmf_host *nvmf_default_host;
+
+static struct nvmf_host *__nvmf_host_find(const char *hostnqn)
+{
+ struct nvmf_host *host;
+
+ list_for_each_entry(host, &nvmf_hosts, list) {
+ if (!strcmp(host->nqn, hostnqn))
+ return host;
+ }
+
+ return NULL;
+}
+
+static struct nvmf_host *nvmf_host_add(const char *hostnqn)
+{
+ struct nvmf_host *host;
+
+ mutex_lock(&nvmf_hosts_mutex);
+ host = __nvmf_host_find(hostnqn);
+ if (host) {
+ kref_get(&host->ref);
+ goto out_unlock;
+ }
+
+ host = kmalloc(sizeof(*host), GFP_KERNEL);
+ if (!host)
+ goto out_unlock;
+
+ kref_init(&host->ref);
+ memcpy(host->nqn, hostnqn, NVMF_NQN_SIZE);
+
+ list_add_tail(&host->list, &nvmf_hosts);
+out_unlock:
+ mutex_unlock(&nvmf_hosts_mutex);
+ return host;
+}
+
+static struct nvmf_host *nvmf_host_default(void)
+{
+ struct nvmf_host *host;
+
+ host = kmalloc(sizeof(*host), GFP_KERNEL);
+ if (!host)
+ return NULL;
+
+ kref_init(&host->ref);
+ uuid_gen(&host->id);
+ snprintf(host->nqn, NVMF_NQN_SIZE,
+ "nqn.2014-08.org.nvmexpress:uuid:%pUb", &host->id);
+
+ mutex_lock(&nvmf_hosts_mutex);
+ list_add_tail(&host->list, &nvmf_hosts);
+ mutex_unlock(&nvmf_hosts_mutex);
+
+ return host;
+}
+
+static void nvmf_host_destroy(struct kref *ref)
+{
+ struct nvmf_host *host = container_of(ref, struct nvmf_host, ref);
+
+ mutex_lock(&nvmf_hosts_mutex);
+ list_del(&host->list);
+ mutex_unlock(&nvmf_hosts_mutex);
+
+ kfree(host);
+}
+
+static void nvmf_host_put(struct nvmf_host *host)
+{
+ if (host)
+ kref_put(&host->ref, nvmf_host_destroy);
+}
+
+/**
+ * nvmf_get_address() - Get address/port
+ * @ctrl: Host NVMe controller instance which we got the address
+ * @buf: OUTPUT parameter that will contain the address/port
+ * @size: buffer size
+ */
+int nvmf_get_address(struct nvme_ctrl *ctrl, char *buf, int size)
+{
+ int len = 0;
+
+ if (ctrl->opts->mask & NVMF_OPT_TRADDR)
+ len += snprintf(buf, size, "traddr=%s", ctrl->opts->traddr);
+ if (ctrl->opts->mask & NVMF_OPT_TRSVCID)
+ len += snprintf(buf + len, size - len, "%strsvcid=%s",
+ (len) ? "," : "", ctrl->opts->trsvcid);
+ if (ctrl->opts->mask & NVMF_OPT_HOST_TRADDR)
+ len += snprintf(buf + len, size - len, "%shost_traddr=%s",
+ (len) ? "," : "", ctrl->opts->host_traddr);
+ len += snprintf(buf + len, size - len, "\n");
+
+ return len;
+}
+EXPORT_SYMBOL_GPL(nvmf_get_address);
+
+/**
+ * nvmf_reg_read32() - NVMe Fabrics "Property Get" API function.
+ * @ctrl: Host NVMe controller instance maintaining the admin
+ * queue used to submit the property read command to
+ * the allocated NVMe controller resource on the target system.
+ * @off: Starting offset value of the targeted property
+ * register (see the fabrics section of the NVMe standard).
+ * @val: OUTPUT parameter that will contain the value of
+ * the property after a successful read.
+ *
+ * Used by the host system to retrieve a 32-bit capsule property value
+ * from an NVMe controller on the target system.
+ *
+ * ("Capsule property" is an "PCIe register concept" applied to the
+ * NVMe fabrics space.)
+ *
+ * Return:
+ * 0: successful read
+ * > 0: NVMe error status code
+ * < 0: Linux errno error code
+ */
+int nvmf_reg_read32(struct nvme_ctrl *ctrl, u32 off, u32 *val)
+{
+ struct nvme_command cmd;
+ union nvme_result res;
+ int ret;
+
+ memset(&cmd, 0, sizeof(cmd));
+ cmd.prop_get.opcode = nvme_fabrics_command;
+ cmd.prop_get.fctype = nvme_fabrics_type_property_get;
+ cmd.prop_get.offset = cpu_to_le32(off);
+
+ ret = __nvme_submit_sync_cmd(ctrl->admin_q, &cmd, &res, NULL, 0, 0,
+ NVME_QID_ANY, 0, 0);
+
+ if (ret >= 0)
+ *val = le64_to_cpu(res.u64);
+ if (unlikely(ret != 0))
+ dev_err(ctrl->device,
+ "Property Get error: %d, offset %#x\n",
+ ret > 0 ? ret & ~NVME_SC_DNR : ret, off);
+
+ return ret;
+}
+EXPORT_SYMBOL_GPL(nvmf_reg_read32);
+
+/**
+ * nvmf_reg_read64() - NVMe Fabrics "Property Get" API function.
+ * @ctrl: Host NVMe controller instance maintaining the admin
+ * queue used to submit the property read command to
+ * the allocated controller resource on the target system.
+ * @off: Starting offset value of the targeted property
+ * register (see the fabrics section of the NVMe standard).
+ * @val: OUTPUT parameter that will contain the value of
+ * the property after a successful read.
+ *
+ * Used by the host system to retrieve a 64-bit capsule property value
+ * from an NVMe controller on the target system.
+ *
+ * ("Capsule property" is an "PCIe register concept" applied to the
+ * NVMe fabrics space.)
+ *
+ * Return:
+ * 0: successful read
+ * > 0: NVMe error status code
+ * < 0: Linux errno error code
+ */
+int nvmf_reg_read64(struct nvme_ctrl *ctrl, u32 off, u64 *val)
+{
+ struct nvme_command cmd;
+ union nvme_result res;
+ int ret;
+
+ memset(&cmd, 0, sizeof(cmd));
+ cmd.prop_get.opcode = nvme_fabrics_command;
+ cmd.prop_get.fctype = nvme_fabrics_type_property_get;
+ cmd.prop_get.attrib = 1;
+ cmd.prop_get.offset = cpu_to_le32(off);
+
+ ret = __nvme_submit_sync_cmd(ctrl->admin_q, &cmd, &res, NULL, 0, 0,
+ NVME_QID_ANY, 0, 0);
+
+ if (ret >= 0)
+ *val = le64_to_cpu(res.u64);
+ if (unlikely(ret != 0))
+ dev_err(ctrl->device,
+ "Property Get error: %d, offset %#x\n",
+ ret > 0 ? ret & ~NVME_SC_DNR : ret, off);
+ return ret;
+}
+EXPORT_SYMBOL_GPL(nvmf_reg_read64);
+
+/**
+ * nvmf_reg_write32() - NVMe Fabrics "Property Write" API function.
+ * @ctrl: Host NVMe controller instance maintaining the admin
+ * queue used to submit the property read command to
+ * the allocated NVMe controller resource on the target system.
+ * @off: Starting offset value of the targeted property
+ * register (see the fabrics section of the NVMe standard).
+ * @val: Input parameter that contains the value to be
+ * written to the property.
+ *
+ * Used by the NVMe host system to write a 32-bit capsule property value
+ * to an NVMe controller on the target system.
+ *
+ * ("Capsule property" is an "PCIe register concept" applied to the
+ * NVMe fabrics space.)
+ *
+ * Return:
+ * 0: successful write
+ * > 0: NVMe error status code
+ * < 0: Linux errno error code
+ */
+int nvmf_reg_write32(struct nvme_ctrl *ctrl, u32 off, u32 val)
+{
+ struct nvme_command cmd;
+ int ret;
+
+ memset(&cmd, 0, sizeof(cmd));
+ cmd.prop_set.opcode = nvme_fabrics_command;
+ cmd.prop_set.fctype = nvme_fabrics_type_property_set;
+ cmd.prop_set.attrib = 0;
+ cmd.prop_set.offset = cpu_to_le32(off);
+ cmd.prop_set.value = cpu_to_le64(val);
+
+ ret = __nvme_submit_sync_cmd(ctrl->admin_q, &cmd, NULL, NULL, 0, 0,
+ NVME_QID_ANY, 0, 0);
+ if (unlikely(ret))
+ dev_err(ctrl->device,
+ "Property Set error: %d, offset %#x\n",
+ ret > 0 ? ret & ~NVME_SC_DNR : ret, off);
+ return ret;
+}
+EXPORT_SYMBOL_GPL(nvmf_reg_write32);
+
+/**
+ * nvmf_log_connect_error() - Error-parsing-diagnostic print
+ * out function for connect() errors.
+ *
+ * @ctrl: the specific /dev/nvmeX device that had the error.
+ *
+ * @errval: Error code to be decoded in a more human-friendly
+ * printout.
+ *
+ * @offset: For use with the NVMe error code NVME_SC_CONNECT_INVALID_PARAM.
+ *
+ * @cmd: This is the SQE portion of a submission capsule.
+ *
+ * @data: This is the "Data" portion of a submission capsule.
+ */
+static void nvmf_log_connect_error(struct nvme_ctrl *ctrl,
+ int errval, int offset, struct nvme_command *cmd,
+ struct nvmf_connect_data *data)
+{
+ int err_sctype = errval & (~NVME_SC_DNR);
+
+ switch (err_sctype) {
+
+ case (NVME_SC_CONNECT_INVALID_PARAM):
+ if (offset >> 16) {
+ char *inv_data = "Connect Invalid Data Parameter";
+
+ switch (offset & 0xffff) {
+ case (offsetof(struct nvmf_connect_data, cntlid)):
+ dev_err(ctrl->device,
+ "%s, cntlid: %d\n",
+ inv_data, data->cntlid);
+ break;
+ case (offsetof(struct nvmf_connect_data, hostnqn)):
+ dev_err(ctrl->device,
+ "%s, hostnqn \"%s\"\n",
+ inv_data, data->hostnqn);
+ break;
+ case (offsetof(struct nvmf_connect_data, subsysnqn)):
+ dev_err(ctrl->device,
+ "%s, subsysnqn \"%s\"\n",
+ inv_data, data->subsysnqn);
+ break;
+ default:
+ dev_err(ctrl->device,
+ "%s, starting byte offset: %d\n",
+ inv_data, offset & 0xffff);
+ break;
+ }
+ } else {
+ char *inv_sqe = "Connect Invalid SQE Parameter";
+
+ switch (offset) {
+ case (offsetof(struct nvmf_connect_command, qid)):
+ dev_err(ctrl->device,
+ "%s, qid %d\n",
+ inv_sqe, cmd->connect.qid);
+ break;
+ default:
+ dev_err(ctrl->device,
+ "%s, starting byte offset: %d\n",
+ inv_sqe, offset);
+ }
+ }
+ break;
+
+ case NVME_SC_CONNECT_INVALID_HOST:
+ dev_err(ctrl->device,
+ "Connect for subsystem %s is not allowed, hostnqn: %s\n",
+ data->subsysnqn, data->hostnqn);
+ break;
+
+ case NVME_SC_CONNECT_CTRL_BUSY:
+ dev_err(ctrl->device,
+ "Connect command failed: controller is busy or not available\n");
+ break;
+
+ case NVME_SC_CONNECT_FORMAT:
+ dev_err(ctrl->device,
+ "Connect incompatible format: %d",
+ cmd->connect.recfmt);
+ break;
+
+ default:
+ dev_err(ctrl->device,
+ "Connect command failed, error wo/DNR bit: %d\n",
+ err_sctype);
+ break;
+ } /* switch (err_sctype) */
+}
+
+/**
+ * nvmf_connect_admin_queue() - NVMe Fabrics Admin Queue "Connect"
+ * API function.
+ * @ctrl: Host nvme controller instance used to request
+ * a new NVMe controller allocation on the target
+ * system and establish an NVMe Admin connection to
+ * that controller.
+ *
+ * This function enables an NVMe host device to request a new allocation of
+ * an NVMe controller resource on a target system as well establish a
+ * fabrics-protocol connection of the NVMe Admin queue between the
+ * host system device and the allocated NVMe controller on the
+ * target system via a NVMe Fabrics "Connect" command.
+ *
+ * Return:
+ * 0: success
+ * > 0: NVMe error status code
+ * < 0: Linux errno error code
+ *
+ */
+int nvmf_connect_admin_queue(struct nvme_ctrl *ctrl)
+{
+ struct nvme_command cmd;
+ union nvme_result res;
+ struct nvmf_connect_data *data;
+ int ret;
+
+ memset(&cmd, 0, sizeof(cmd));
+ cmd.connect.opcode = nvme_fabrics_command;
+ cmd.connect.fctype = nvme_fabrics_type_connect;
+ cmd.connect.qid = 0;
+ cmd.connect.sqsize = cpu_to_le16(NVME_AQ_DEPTH - 1);
+
+ /*
+ * Set keep-alive timeout in seconds granularity (ms * 1000)
+ * and add a grace period for controller kato enforcement
+ */
+ cmd.connect.kato = ctrl->opts->discovery_nqn ? 0 :
+ cpu_to_le32((ctrl->kato + NVME_KATO_GRACE) * 1000);
+
+ data = kzalloc(sizeof(*data), GFP_KERNEL);
+ if (!data)
+ return -ENOMEM;
+
+ uuid_copy(&data->hostid, &ctrl->opts->host->id);
+ data->cntlid = cpu_to_le16(0xffff);
+ strncpy(data->subsysnqn, ctrl->opts->subsysnqn, NVMF_NQN_SIZE);
+ strncpy(data->hostnqn, ctrl->opts->host->nqn, NVMF_NQN_SIZE);
+
+ ret = __nvme_submit_sync_cmd(ctrl->admin_q, &cmd, &res,
+ data, sizeof(*data), 0, NVME_QID_ANY, 1,
+ BLK_MQ_REQ_RESERVED | BLK_MQ_REQ_NOWAIT);
+ if (ret) {
+ nvmf_log_connect_error(ctrl, ret, le32_to_cpu(res.u32),
+ &cmd, data);
+ goto out_free_data;
+ }
+
+ ctrl->cntlid = le16_to_cpu(res.u16);
+
+out_free_data:
+ kfree(data);
+ return ret;
+}
+EXPORT_SYMBOL_GPL(nvmf_connect_admin_queue);
+
+/**
+ * nvmf_connect_io_queue() - NVMe Fabrics I/O Queue "Connect"
+ * API function.
+ * @ctrl: Host nvme controller instance used to establish an
+ * NVMe I/O queue connection to the already allocated NVMe
+ * controller on the target system.
+ * @qid: NVMe I/O queue number for the new I/O connection between
+ * host and target (note qid == 0 is illegal as this is
+ * the Admin queue, per NVMe standard).
+ *
+ * This function issues a fabrics-protocol connection
+ * of a NVMe I/O queue (via NVMe Fabrics "Connect" command)
+ * between the host system device and the allocated NVMe controller
+ * on the target system.
+ *
+ * Return:
+ * 0: success
+ * > 0: NVMe error status code
+ * < 0: Linux errno error code
+ */
+int nvmf_connect_io_queue(struct nvme_ctrl *ctrl, u16 qid)
+{
+ struct nvme_command cmd;
+ struct nvmf_connect_data *data;
+ union nvme_result res;
+ int ret;
+
+ memset(&cmd, 0, sizeof(cmd));
+ cmd.connect.opcode = nvme_fabrics_command;
+ cmd.connect.fctype = nvme_fabrics_type_connect;
+ cmd.connect.qid = cpu_to_le16(qid);
+ cmd.connect.sqsize = cpu_to_le16(ctrl->sqsize);
+
+ data = kzalloc(sizeof(*data), GFP_KERNEL);
+ if (!data)
+ return -ENOMEM;
+
+ uuid_copy(&data->hostid, &ctrl->opts->host->id);
+ data->cntlid = cpu_to_le16(ctrl->cntlid);
+ strncpy(data->subsysnqn, ctrl->opts->subsysnqn, NVMF_NQN_SIZE);
+ strncpy(data->hostnqn, ctrl->opts->host->nqn, NVMF_NQN_SIZE);
+
+ ret = __nvme_submit_sync_cmd(ctrl->connect_q, &cmd, &res,
+ data, sizeof(*data), 0, qid, 1,
+ BLK_MQ_REQ_RESERVED | BLK_MQ_REQ_NOWAIT);
+ if (ret) {
+ nvmf_log_connect_error(ctrl, ret, le32_to_cpu(res.u32),
+ &cmd, data);
+ }
+ kfree(data);
+ return ret;
+}
+EXPORT_SYMBOL_GPL(nvmf_connect_io_queue);
+
+bool nvmf_should_reconnect(struct nvme_ctrl *ctrl)
+{
+ if (ctrl->opts->max_reconnects != -1 &&
+ ctrl->nr_reconnects < ctrl->opts->max_reconnects)
+ return true;
+
+ return false;
+}
+EXPORT_SYMBOL_GPL(nvmf_should_reconnect);
+
+/**
+ * nvmf_register_transport() - NVMe Fabrics Library registration function.
+ * @ops: Transport ops instance to be registered to the
+ * common fabrics library.
+ *
+ * API function that registers the type of specific transport fabric
+ * being implemented to the common NVMe fabrics library. Part of
+ * the overall init sequence of starting up a fabrics driver.
+ */
+int nvmf_register_transport(struct nvmf_transport_ops *ops)
+{
+ if (!ops->create_ctrl)
+ return -EINVAL;
+
+ down_write(&nvmf_transports_rwsem);
+ list_add_tail(&ops->entry, &nvmf_transports);
+ up_write(&nvmf_transports_rwsem);
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(nvmf_register_transport);
+
+/**
+ * nvmf_unregister_transport() - NVMe Fabrics Library unregistration function.
+ * @ops: Transport ops instance to be unregistered from the
+ * common fabrics library.
+ *
+ * Fabrics API function that unregisters the type of specific transport
+ * fabric being implemented from the common NVMe fabrics library.
+ * Part of the overall exit sequence of unloading the implemented driver.
+ */
+void nvmf_unregister_transport(struct nvmf_transport_ops *ops)
+{
+ down_write(&nvmf_transports_rwsem);
+ list_del(&ops->entry);
+ up_write(&nvmf_transports_rwsem);
+}
+EXPORT_SYMBOL_GPL(nvmf_unregister_transport);
+
+static struct nvmf_transport_ops *nvmf_lookup_transport(
+ struct nvmf_ctrl_options *opts)
+{
+ struct nvmf_transport_ops *ops;
+
+ lockdep_assert_held(&nvmf_transports_rwsem);
+
+ list_for_each_entry(ops, &nvmf_transports, entry) {
+ if (strcmp(ops->name, opts->transport) == 0)
+ return ops;
+ }
+
+ return NULL;
+}
+
+static const match_table_t opt_tokens = {
+ { NVMF_OPT_TRANSPORT, "transport=%s" },
+ { NVMF_OPT_TRADDR, "traddr=%s" },
+ { NVMF_OPT_TRSVCID, "trsvcid=%s" },
+ { NVMF_OPT_NQN, "nqn=%s" },
+ { NVMF_OPT_QUEUE_SIZE, "queue_size=%d" },
+ { NVMF_OPT_NR_IO_QUEUES, "nr_io_queues=%d" },
+ { NVMF_OPT_RECONNECT_DELAY, "reconnect_delay=%d" },
+ { NVMF_OPT_CTRL_LOSS_TMO, "ctrl_loss_tmo=%d" },
+ { NVMF_OPT_KATO, "keep_alive_tmo=%d" },
+ { NVMF_OPT_HOSTNQN, "hostnqn=%s" },
+ { NVMF_OPT_HOST_TRADDR, "host_traddr=%s" },
+ { NVMF_OPT_HOST_ID, "hostid=%s" },
+ { NVMF_OPT_ERR, NULL }
+};
+
+static int nvmf_parse_options(struct nvmf_ctrl_options *opts,
+ const char *buf)
+{
+ substring_t args[MAX_OPT_ARGS];
+ char *options, *o, *p;
+ int token, ret = 0;
+ size_t nqnlen = 0;
+ int ctrl_loss_tmo = NVMF_DEF_CTRL_LOSS_TMO;
+ uuid_t hostid;
+
+ /* Set defaults */
+ opts->queue_size = NVMF_DEF_QUEUE_SIZE;
+ opts->nr_io_queues = num_online_cpus();
+ opts->reconnect_delay = NVMF_DEF_RECONNECT_DELAY;
+ opts->kato = NVME_DEFAULT_KATO;
+
+ options = o = kstrdup(buf, GFP_KERNEL);
+ if (!options)
+ return -ENOMEM;
+
+ uuid_gen(&hostid);
+
+ while ((p = strsep(&o, ",\n")) != NULL) {
+ if (!*p)
+ continue;
+
+ token = match_token(p, opt_tokens, args);
+ opts->mask |= token;
+ switch (token) {
+ case NVMF_OPT_TRANSPORT:
+ p = match_strdup(args);
+ if (!p) {
+ ret = -ENOMEM;
+ goto out;
+ }
+ kfree(opts->transport);
+ opts->transport = p;
+ break;
+ case NVMF_OPT_NQN:
+ p = match_strdup(args);
+ if (!p) {
+ ret = -ENOMEM;
+ goto out;
+ }
+ kfree(opts->subsysnqn);
+ opts->subsysnqn = p;
+ nqnlen = strlen(opts->subsysnqn);
+ if (nqnlen >= NVMF_NQN_SIZE) {
+ pr_err("%s needs to be < %d bytes\n",
+ opts->subsysnqn, NVMF_NQN_SIZE);
+ ret = -EINVAL;
+ goto out;
+ }
+ opts->discovery_nqn =
+ !(strcmp(opts->subsysnqn,
+ NVME_DISC_SUBSYS_NAME));
+ if (opts->discovery_nqn) {
+ opts->kato = 0;
+ opts->nr_io_queues = 0;
+ }
+ break;
+ case NVMF_OPT_TRADDR:
+ p = match_strdup(args);
+ if (!p) {
+ ret = -ENOMEM;
+ goto out;
+ }
+ kfree(opts->traddr);
+ opts->traddr = p;
+ break;
+ case NVMF_OPT_TRSVCID:
+ p = match_strdup(args);
+ if (!p) {
+ ret = -ENOMEM;
+ goto out;
+ }
+ kfree(opts->trsvcid);
+ opts->trsvcid = p;
+ break;
+ case NVMF_OPT_QUEUE_SIZE:
+ if (match_int(args, &token)) {
+ ret = -EINVAL;
+ goto out;
+ }
+ if (token < NVMF_MIN_QUEUE_SIZE ||
+ token > NVMF_MAX_QUEUE_SIZE) {
+ pr_err("Invalid queue_size %d\n", token);
+ ret = -EINVAL;
+ goto out;
+ }
+ opts->queue_size = token;
+ break;
+ case NVMF_OPT_NR_IO_QUEUES:
+ if (match_int(args, &token)) {
+ ret = -EINVAL;
+ goto out;
+ }
+ if (token <= 0) {
+ pr_err("Invalid number of IOQs %d\n", token);
+ ret = -EINVAL;
+ goto out;
+ }
+ opts->nr_io_queues = min_t(unsigned int,
+ num_online_cpus(), token);
+ break;
+ case NVMF_OPT_KATO:
+ if (match_int(args, &token)) {
+ ret = -EINVAL;
+ goto out;
+ }
+
+ if (token < 0) {
+ pr_err("Invalid keep_alive_tmo %d\n", token);
+ ret = -EINVAL;
+ goto out;
+ } else if (token == 0 && !opts->discovery_nqn) {
+ /* Allowed for debug */
+ pr_warn("keep_alive_tmo 0 won't execute keep alives!!!\n");
+ }
+ opts->kato = token;
+
+ if (opts->discovery_nqn && opts->kato) {
+ pr_err("Discovery controllers cannot accept KATO != 0\n");
+ ret = -EINVAL;
+ goto out;
+ }
+
+ break;
+ case NVMF_OPT_CTRL_LOSS_TMO:
+ if (match_int(args, &token)) {
+ ret = -EINVAL;
+ goto out;
+ }
+
+ if (token < 0)
+ pr_warn("ctrl_loss_tmo < 0 will reconnect forever\n");
+ ctrl_loss_tmo = token;
+ break;
+ case NVMF_OPT_HOSTNQN:
+ if (opts->host) {
+ pr_err("hostnqn already user-assigned: %s\n",
+ opts->host->nqn);
+ ret = -EADDRINUSE;
+ goto out;
+ }
+ p = match_strdup(args);
+ if (!p) {
+ ret = -ENOMEM;
+ goto out;
+ }
+ nqnlen = strlen(p);
+ if (nqnlen >= NVMF_NQN_SIZE) {
+ pr_err("%s needs to be < %d bytes\n",
+ p, NVMF_NQN_SIZE);
+ kfree(p);
+ ret = -EINVAL;
+ goto out;
+ }
+ nvmf_host_put(opts->host);
+ opts->host = nvmf_host_add(p);
+ kfree(p);
+ if (!opts->host) {
+ ret = -ENOMEM;
+ goto out;
+ }
+ break;
+ case NVMF_OPT_RECONNECT_DELAY:
+ if (match_int(args, &token)) {
+ ret = -EINVAL;
+ goto out;
+ }
+ if (token <= 0) {
+ pr_err("Invalid reconnect_delay %d\n", token);
+ ret = -EINVAL;
+ goto out;
+ }
+ opts->reconnect_delay = token;
+ break;
+ case NVMF_OPT_HOST_TRADDR:
+ p = match_strdup(args);
+ if (!p) {
+ ret = -ENOMEM;
+ goto out;
+ }
+ kfree(opts->host_traddr);
+ opts->host_traddr = p;
+ break;
+ case NVMF_OPT_HOST_ID:
+ p = match_strdup(args);
+ if (!p) {
+ ret = -ENOMEM;
+ goto out;
+ }
+ if (uuid_parse(p, &hostid)) {
+ pr_err("Invalid hostid %s\n", p);
+ ret = -EINVAL;
+ goto out;
+ }
+ break;
+ default:
+ pr_warn("unknown parameter or missing value '%s' in ctrl creation request\n",
+ p);
+ ret = -EINVAL;
+ goto out;
+ }
+ }
+
+ if (ctrl_loss_tmo < 0)
+ opts->max_reconnects = -1;
+ else
+ opts->max_reconnects = DIV_ROUND_UP(ctrl_loss_tmo,
+ opts->reconnect_delay);
+
+ if (!opts->host) {
+ kref_get(&nvmf_default_host->ref);
+ opts->host = nvmf_default_host;
+ }
+
+ uuid_copy(&opts->host->id, &hostid);
+
+out:
+ kfree(options);
+ return ret;
+}
+
+static int nvmf_check_required_opts(struct nvmf_ctrl_options *opts,
+ unsigned int required_opts)
+{
+ if ((opts->mask & required_opts) != required_opts) {
+ int i;
+
+ for (i = 0; i < ARRAY_SIZE(opt_tokens); i++) {
+ if ((opt_tokens[i].token & required_opts) &&
+ !(opt_tokens[i].token & opts->mask)) {
+ pr_warn("missing parameter '%s'\n",
+ opt_tokens[i].pattern);
+ }
+ }
+
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+static int nvmf_check_allowed_opts(struct nvmf_ctrl_options *opts,
+ unsigned int allowed_opts)
+{
+ if (opts->mask & ~allowed_opts) {
+ int i;
+
+ for (i = 0; i < ARRAY_SIZE(opt_tokens); i++) {
+ if ((opt_tokens[i].token & opts->mask) &&
+ (opt_tokens[i].token & ~allowed_opts)) {
+ pr_warn("invalid parameter '%s'\n",
+ opt_tokens[i].pattern);
+ }
+ }
+
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+void nvmf_free_options(struct nvmf_ctrl_options *opts)
+{
+ nvmf_host_put(opts->host);
+ kfree(opts->transport);
+ kfree(opts->traddr);
+ kfree(opts->trsvcid);
+ kfree(opts->subsysnqn);
+ kfree(opts->host_traddr);
+ kfree(opts);
+}
+EXPORT_SYMBOL_GPL(nvmf_free_options);
+
+#define NVMF_REQUIRED_OPTS (NVMF_OPT_TRANSPORT | NVMF_OPT_NQN)
+#define NVMF_ALLOWED_OPTS (NVMF_OPT_QUEUE_SIZE | NVMF_OPT_NR_IO_QUEUES | \
+ NVMF_OPT_KATO | NVMF_OPT_HOSTNQN | \
+ NVMF_OPT_HOST_ID)
+
+static struct nvme_ctrl *
+nvmf_create_ctrl(struct device *dev, const char *buf, size_t count)
+{
+ struct nvmf_ctrl_options *opts;
+ struct nvmf_transport_ops *ops;
+ struct nvme_ctrl *ctrl;
+ int ret;
+
+ opts = kzalloc(sizeof(*opts), GFP_KERNEL);
+ if (!opts)
+ return ERR_PTR(-ENOMEM);
+
+ ret = nvmf_parse_options(opts, buf);
+ if (ret)
+ goto out_free_opts;
+
+ /*
+ * Check the generic options first as we need a valid transport for
+ * the lookup below. Then clear the generic flags so that transport
+ * drivers don't have to care about them.
+ */
+ ret = nvmf_check_required_opts(opts, NVMF_REQUIRED_OPTS);
+ if (ret)
+ goto out_free_opts;
+ opts->mask &= ~NVMF_REQUIRED_OPTS;
+
+ down_read(&nvmf_transports_rwsem);
+ ops = nvmf_lookup_transport(opts);
+ if (!ops) {
+ pr_info("no handler found for transport %s.\n",
+ opts->transport);
+ ret = -EINVAL;
+ goto out_unlock;
+ }
+
+ ret = nvmf_check_required_opts(opts, ops->required_opts);
+ if (ret)
+ goto out_unlock;
+ ret = nvmf_check_allowed_opts(opts, NVMF_ALLOWED_OPTS |
+ ops->allowed_opts | ops->required_opts);
+ if (ret)
+ goto out_unlock;
+
+ ctrl = ops->create_ctrl(dev, opts);
+ if (IS_ERR(ctrl)) {
+ ret = PTR_ERR(ctrl);
+ goto out_unlock;
+ }
+
+ if (strcmp(ctrl->subnqn, opts->subsysnqn)) {
+ dev_warn(ctrl->device,
+ "controller returned incorrect NQN: \"%s\".\n",
+ ctrl->subnqn);
+ up_read(&nvmf_transports_rwsem);
+ ctrl->ops->delete_ctrl(ctrl);
+ return ERR_PTR(-EINVAL);
+ }
+
+ up_read(&nvmf_transports_rwsem);
+ return ctrl;
+
+out_unlock:
+ up_read(&nvmf_transports_rwsem);
+out_free_opts:
+ nvmf_free_options(opts);
+ return ERR_PTR(ret);
+}
+
+static struct class *nvmf_class;
+static struct device *nvmf_device;
+static DEFINE_MUTEX(nvmf_dev_mutex);
+
+static ssize_t nvmf_dev_write(struct file *file, const char __user *ubuf,
+ size_t count, loff_t *pos)
+{
+ struct seq_file *seq_file = file->private_data;
+ struct nvme_ctrl *ctrl;
+ const char *buf;
+ int ret = 0;
+
+ if (count > PAGE_SIZE)
+ return -ENOMEM;
+
+ buf = memdup_user_nul(ubuf, count);
+ if (IS_ERR(buf))
+ return PTR_ERR(buf);
+
+ mutex_lock(&nvmf_dev_mutex);
+ if (seq_file->private) {
+ ret = -EINVAL;
+ goto out_unlock;
+ }
+
+ ctrl = nvmf_create_ctrl(nvmf_device, buf, count);
+ if (IS_ERR(ctrl)) {
+ ret = PTR_ERR(ctrl);
+ goto out_unlock;
+ }
+
+ seq_file->private = ctrl;
+
+out_unlock:
+ mutex_unlock(&nvmf_dev_mutex);
+ kfree(buf);
+ return ret ? ret : count;
+}
+
+static int nvmf_dev_show(struct seq_file *seq_file, void *private)
+{
+ struct nvme_ctrl *ctrl;
+ int ret = 0;
+
+ mutex_lock(&nvmf_dev_mutex);
+ ctrl = seq_file->private;
+ if (!ctrl) {
+ ret = -EINVAL;
+ goto out_unlock;
+ }
+
+ seq_printf(seq_file, "instance=%d,cntlid=%d\n",
+ ctrl->instance, ctrl->cntlid);
+
+out_unlock:
+ mutex_unlock(&nvmf_dev_mutex);
+ return ret;
+}
+
+static int nvmf_dev_open(struct inode *inode, struct file *file)
+{
+ /*
+ * The miscdevice code initializes file->private_data, but doesn't
+ * make use of it later.
+ */
+ file->private_data = NULL;
+ return single_open(file, nvmf_dev_show, NULL);
+}
+
+static int nvmf_dev_release(struct inode *inode, struct file *file)
+{
+ struct seq_file *seq_file = file->private_data;
+ struct nvme_ctrl *ctrl = seq_file->private;
+
+ if (ctrl)
+ nvme_put_ctrl(ctrl);
+ return single_release(inode, file);
+}
+
+static const struct file_operations nvmf_dev_fops = {
+ .owner = THIS_MODULE,
+ .write = nvmf_dev_write,
+ .read = seq_read,
+ .open = nvmf_dev_open,
+ .release = nvmf_dev_release,
+};
+
+static struct miscdevice nvmf_misc = {
+ .minor = MISC_DYNAMIC_MINOR,
+ .name = "nvme-fabrics",
+ .fops = &nvmf_dev_fops,
+};
+
+static int __init nvmf_init(void)
+{
+ int ret;
+
+ nvmf_default_host = nvmf_host_default();
+ if (!nvmf_default_host)
+ return -ENOMEM;
+
+ nvmf_class = class_create(THIS_MODULE, "nvme-fabrics");
+ if (IS_ERR(nvmf_class)) {
+ pr_err("couldn't register class nvme-fabrics\n");
+ ret = PTR_ERR(nvmf_class);
+ goto out_free_host;
+ }
+
+ nvmf_device =
+ device_create(nvmf_class, NULL, MKDEV(0, 0), NULL, "ctl");
+ if (IS_ERR(nvmf_device)) {
+ pr_err("couldn't create nvme-fabris device!\n");
+ ret = PTR_ERR(nvmf_device);
+ goto out_destroy_class;
+ }
+
+ ret = misc_register(&nvmf_misc);
+ if (ret) {
+ pr_err("couldn't register misc device: %d\n", ret);
+ goto out_destroy_device;
+ }
+
+ return 0;
+
+out_destroy_device:
+ device_destroy(nvmf_class, MKDEV(0, 0));
+out_destroy_class:
+ class_destroy(nvmf_class);
+out_free_host:
+ nvmf_host_put(nvmf_default_host);
+ return ret;
+}
+
+static void __exit nvmf_exit(void)
+{
+ misc_deregister(&nvmf_misc);
+ device_destroy(nvmf_class, MKDEV(0, 0));
+ class_destroy(nvmf_class);
+ nvmf_host_put(nvmf_default_host);
+
+ BUILD_BUG_ON(sizeof(struct nvmf_connect_command) != 64);
+ BUILD_BUG_ON(sizeof(struct nvmf_property_get_command) != 64);
+ BUILD_BUG_ON(sizeof(struct nvmf_property_set_command) != 64);
+ BUILD_BUG_ON(sizeof(struct nvmf_connect_data) != 1024);
+}
+
+MODULE_LICENSE("GPL v2");
+
+module_init(nvmf_init);
+module_exit(nvmf_exit);
diff --git a/src/kernel/linux/v4.14/drivers/nvme/host/fabrics.h b/src/kernel/linux/v4.14/drivers/nvme/host/fabrics.h
new file mode 100644
index 0000000..9ff8529
--- /dev/null
+++ b/src/kernel/linux/v4.14/drivers/nvme/host/fabrics.h
@@ -0,0 +1,175 @@
+/*
+ * NVMe over Fabrics common host code.
+ * Copyright (c) 2015-2016 HGST, a Western Digital Company.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ */
+#ifndef _NVME_FABRICS_H
+#define _NVME_FABRICS_H 1
+
+#include <linux/in.h>
+#include <linux/inet.h>
+
+#define NVMF_MIN_QUEUE_SIZE 16
+#define NVMF_MAX_QUEUE_SIZE 1024
+#define NVMF_DEF_QUEUE_SIZE 128
+#define NVMF_DEF_RECONNECT_DELAY 10
+/* default to 600 seconds of reconnect attempts before giving up */
+#define NVMF_DEF_CTRL_LOSS_TMO 600
+
+/*
+ * Define a host as seen by the target. We allocate one at boot, but also
+ * allow the override it when creating controllers. This is both to provide
+ * persistence of the Host NQN over multiple boots, and to allow using
+ * multiple ones, for example in a container scenario. Because we must not
+ * use different Host NQNs with the same Host ID we generate a Host ID and
+ * use this structure to keep track of the relation between the two.
+ */
+struct nvmf_host {
+ struct kref ref;
+ struct list_head list;
+ char nqn[NVMF_NQN_SIZE];
+ uuid_t id;
+};
+
+/**
+ * enum nvmf_parsing_opts - used to define the sysfs parsing options used.
+ */
+enum {
+ NVMF_OPT_ERR = 0,
+ NVMF_OPT_TRANSPORT = 1 << 0,
+ NVMF_OPT_NQN = 1 << 1,
+ NVMF_OPT_TRADDR = 1 << 2,
+ NVMF_OPT_TRSVCID = 1 << 3,
+ NVMF_OPT_QUEUE_SIZE = 1 << 4,
+ NVMF_OPT_NR_IO_QUEUES = 1 << 5,
+ NVMF_OPT_TL_RETRY_COUNT = 1 << 6,
+ NVMF_OPT_KATO = 1 << 7,
+ NVMF_OPT_HOSTNQN = 1 << 8,
+ NVMF_OPT_RECONNECT_DELAY = 1 << 9,
+ NVMF_OPT_HOST_TRADDR = 1 << 10,
+ NVMF_OPT_CTRL_LOSS_TMO = 1 << 11,
+ NVMF_OPT_HOST_ID = 1 << 12,
+};
+
+/**
+ * struct nvmf_ctrl_options - Used to hold the options specified
+ * with the parsing opts enum.
+ * @mask: Used by the fabrics library to parse through sysfs options
+ * on adding a NVMe controller.
+ * @transport: Holds the fabric transport "technology name" (for a lack of
+ * better description) that will be used by an NVMe controller
+ * being added.
+ * @subsysnqn: Hold the fully qualified NQN subystem name (format defined
+ * in the NVMe specification, "NVMe Qualified Names").
+ * @traddr: The transport-specific TRADDR field for a port on the
+ * subsystem which is adding a controller.
+ * @trsvcid: The transport-specific TRSVCID field for a port on the
+ * subsystem which is adding a controller.
+ * @host_traddr: A transport-specific field identifying the NVME host port
+ * to use for the connection to the controller.
+ * @queue_size: Number of IO queue elements.
+ * @nr_io_queues: Number of controller IO queues that will be established.
+ * @reconnect_delay: Time between two consecutive reconnect attempts.
+ * @discovery_nqn: indicates if the subsysnqn is the well-known discovery NQN.
+ * @kato: Keep-alive timeout.
+ * @host: Virtual NVMe host, contains the NQN and Host ID.
+ * @max_reconnects: maximum number of allowed reconnect attempts before removing
+ * the controller, (-1) means reconnect forever, zero means remove
+ * immediately;
+ */
+struct nvmf_ctrl_options {
+ unsigned mask;
+ char *transport;
+ char *subsysnqn;
+ char *traddr;
+ char *trsvcid;
+ char *host_traddr;
+ size_t queue_size;
+ unsigned int nr_io_queues;
+ unsigned int reconnect_delay;
+ bool discovery_nqn;
+ unsigned int kato;
+ struct nvmf_host *host;
+ int max_reconnects;
+};
+
+/*
+ * struct nvmf_transport_ops - used to register a specific
+ * fabric implementation of NVMe fabrics.
+ * @entry: Used by the fabrics library to add the new
+ * registration entry to its linked-list internal tree.
+ * @name: Name of the NVMe fabric driver implementation.
+ * @required_opts: sysfs command-line options that must be specified
+ * when adding a new NVMe controller.
+ * @allowed_opts: sysfs command-line options that can be specified
+ * when adding a new NVMe controller.
+ * @create_ctrl(): function pointer that points to a non-NVMe
+ * implementation-specific fabric technology
+ * that would go into starting up that fabric
+ * for the purpose of conneciton to an NVMe controller
+ * using that fabric technology.
+ *
+ * Notes:
+ * 1. At minimum, 'required_opts' and 'allowed_opts' should
+ * be set to the same enum parsing options defined earlier.
+ * 2. create_ctrl() must be defined (even if it does nothing)
+ */
+struct nvmf_transport_ops {
+ struct list_head entry;
+ const char *name;
+ int required_opts;
+ int allowed_opts;
+ struct nvme_ctrl *(*create_ctrl)(struct device *dev,
+ struct nvmf_ctrl_options *opts);
+};
+
+int nvmf_reg_read32(struct nvme_ctrl *ctrl, u32 off, u32 *val);
+int nvmf_reg_read64(struct nvme_ctrl *ctrl, u32 off, u64 *val);
+int nvmf_reg_write32(struct nvme_ctrl *ctrl, u32 off, u32 val);
+int nvmf_connect_admin_queue(struct nvme_ctrl *ctrl);
+int nvmf_connect_io_queue(struct nvme_ctrl *ctrl, u16 qid);
+int nvmf_register_transport(struct nvmf_transport_ops *ops);
+void nvmf_unregister_transport(struct nvmf_transport_ops *ops);
+void nvmf_free_options(struct nvmf_ctrl_options *opts);
+int nvmf_get_address(struct nvme_ctrl *ctrl, char *buf, int size);
+bool nvmf_should_reconnect(struct nvme_ctrl *ctrl);
+
+static inline blk_status_t nvmf_check_init_req(struct nvme_ctrl *ctrl,
+ struct request *rq)
+{
+ struct nvme_command *cmd = nvme_req(rq)->cmd;
+
+ /*
+ * We cannot accept any other command until the connect command has
+ * completed, so only allow connect to pass.
+ */
+ if (!blk_rq_is_passthrough(rq) ||
+ cmd->common.opcode != nvme_fabrics_command ||
+ cmd->fabrics.fctype != nvme_fabrics_type_connect) {
+ /*
+ * Reconnecting state means transport disruption, which can take
+ * a long time and even might fail permanently, fail fast to
+ * give upper layers a chance to failover.
+ * Deleting state means that the ctrl will never accept commands
+ * again, fail it permanently.
+ */
+ if (ctrl->state == NVME_CTRL_RECONNECTING ||
+ ctrl->state == NVME_CTRL_DELETING) {
+ nvme_req(rq)->status = NVME_SC_ABORT_REQ;
+ return BLK_STS_IOERR;
+ }
+ return BLK_STS_RESOURCE; /* try again later */
+ }
+
+ return BLK_STS_OK;
+}
+
+#endif /* _NVME_FABRICS_H */
diff --git a/src/kernel/linux/v4.14/drivers/nvme/host/fc.c b/src/kernel/linux/v4.14/drivers/nvme/host/fc.c
new file mode 100644
index 0000000..e95d2f7
--- /dev/null
+++ b/src/kernel/linux/v4.14/drivers/nvme/host/fc.c
@@ -0,0 +1,3068 @@
+/*
+ * Copyright (c) 2016 Avago Technologies. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of version 2 of the GNU General Public License as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful.
+ * ALL EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND WARRANTIES,
+ * INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS FOR A
+ * PARTICULAR PURPOSE, OR NON-INFRINGEMENT, ARE DISCLAIMED, EXCEPT TO
+ * THE EXTENT THAT SUCH DISCLAIMERS ARE HELD TO BE LEGALLY INVALID.
+ * See the GNU General Public License for more details, a copy of which
+ * can be found in the file COPYING included with this package
+ *
+ */
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+#include <linux/module.h>
+#include <linux/parser.h>
+#include <uapi/scsi/fc/fc_fs.h>
+#include <uapi/scsi/fc/fc_els.h>
+#include <linux/delay.h>
+
+#include "nvme.h"
+#include "fabrics.h"
+#include <linux/nvme-fc-driver.h>
+#include <linux/nvme-fc.h>
+
+
+/* *************************** Data Structures/Defines ****************** */
+
+
+/*
+ * We handle AEN commands ourselves and don't even let the
+ * block layer know about them.
+ */
+#define NVME_FC_NR_AEN_COMMANDS 1
+#define NVME_FC_AQ_BLKMQ_DEPTH \
+ (NVME_AQ_DEPTH - NVME_FC_NR_AEN_COMMANDS)
+#define AEN_CMDID_BASE (NVME_FC_AQ_BLKMQ_DEPTH + 1)
+
+enum nvme_fc_queue_flags {
+ NVME_FC_Q_CONNECTED = (1 << 0),
+ NVME_FC_Q_LIVE = (1 << 1),
+};
+
+#define NVMEFC_QUEUE_DELAY 3 /* ms units */
+
+struct nvme_fc_queue {
+ struct nvme_fc_ctrl *ctrl;
+ struct device *dev;
+ struct blk_mq_hw_ctx *hctx;
+ void *lldd_handle;
+ int queue_size;
+ size_t cmnd_capsule_len;
+ u32 qnum;
+ u32 rqcnt;
+ u32 seqno;
+
+ u64 connection_id;
+ atomic_t csn;
+
+ unsigned long flags;
+} __aligned(sizeof(u64)); /* alignment for other things alloc'd with */
+
+enum nvme_fcop_flags {
+ FCOP_FLAGS_TERMIO = (1 << 0),
+ FCOP_FLAGS_RELEASED = (1 << 1),
+ FCOP_FLAGS_COMPLETE = (1 << 2),
+ FCOP_FLAGS_AEN = (1 << 3),
+};
+
+struct nvmefc_ls_req_op {
+ struct nvmefc_ls_req ls_req;
+
+ struct nvme_fc_rport *rport;
+ struct nvme_fc_queue *queue;
+ struct request *rq;
+ u32 flags;
+
+ int ls_error;
+ struct completion ls_done;
+ struct list_head lsreq_list; /* rport->ls_req_list */
+ bool req_queued;
+};
+
+enum nvme_fcpop_state {
+ FCPOP_STATE_UNINIT = 0,
+ FCPOP_STATE_IDLE = 1,
+ FCPOP_STATE_ACTIVE = 2,
+ FCPOP_STATE_ABORTED = 3,
+ FCPOP_STATE_COMPLETE = 4,
+};
+
+struct nvme_fc_fcp_op {
+ struct nvme_request nreq; /*
+ * nvme/host/core.c
+ * requires this to be
+ * the 1st element in the
+ * private structure
+ * associated with the
+ * request.
+ */
+ struct nvmefc_fcp_req fcp_req;
+
+ struct nvme_fc_ctrl *ctrl;
+ struct nvme_fc_queue *queue;
+ struct request *rq;
+
+ atomic_t state;
+ u32 flags;
+ u32 rqno;
+ u32 nents;
+
+ struct nvme_fc_cmd_iu cmd_iu;
+ struct nvme_fc_ersp_iu rsp_iu;
+};
+
+struct nvme_fc_lport {
+ struct nvme_fc_local_port localport;
+
+ struct ida endp_cnt;
+ struct list_head port_list; /* nvme_fc_port_list */
+ struct list_head endp_list;
+ struct device *dev; /* physical device for dma */
+ struct nvme_fc_port_template *ops;
+ struct kref ref;
+} __aligned(sizeof(u64)); /* alignment for other things alloc'd with */
+
+struct nvme_fc_rport {
+ struct nvme_fc_remote_port remoteport;
+
+ struct list_head endp_list; /* for lport->endp_list */
+ struct list_head ctrl_list;
+ struct list_head ls_req_list;
+ struct device *dev; /* physical device for dma */
+ struct nvme_fc_lport *lport;
+ spinlock_t lock;
+ struct kref ref;
+} __aligned(sizeof(u64)); /* alignment for other things alloc'd with */
+
+enum nvme_fcctrl_flags {
+ FCCTRL_TERMIO = (1 << 0),
+};
+
+struct nvme_fc_ctrl {
+ spinlock_t lock;
+ struct nvme_fc_queue *queues;
+ struct device *dev;
+ struct nvme_fc_lport *lport;
+ struct nvme_fc_rport *rport;
+ u32 cnum;
+
+ u64 association_id;
+
+ struct list_head ctrl_list; /* rport->ctrl_list */
+
+ struct blk_mq_tag_set admin_tag_set;
+ struct blk_mq_tag_set tag_set;
+
+ struct work_struct delete_work;
+ struct delayed_work connect_work;
+
+ struct kref ref;
+ u32 flags;
+ u32 iocnt;
+ wait_queue_head_t ioabort_wait;
+
+ struct nvme_fc_fcp_op aen_ops[NVME_FC_NR_AEN_COMMANDS];
+
+ struct nvme_ctrl ctrl;
+};
+
+static inline struct nvme_fc_ctrl *
+to_fc_ctrl(struct nvme_ctrl *ctrl)
+{
+ return container_of(ctrl, struct nvme_fc_ctrl, ctrl);
+}
+
+static inline struct nvme_fc_lport *
+localport_to_lport(struct nvme_fc_local_port *portptr)
+{
+ return container_of(portptr, struct nvme_fc_lport, localport);
+}
+
+static inline struct nvme_fc_rport *
+remoteport_to_rport(struct nvme_fc_remote_port *portptr)
+{
+ return container_of(portptr, struct nvme_fc_rport, remoteport);
+}
+
+static inline struct nvmefc_ls_req_op *
+ls_req_to_lsop(struct nvmefc_ls_req *lsreq)
+{
+ return container_of(lsreq, struct nvmefc_ls_req_op, ls_req);
+}
+
+static inline struct nvme_fc_fcp_op *
+fcp_req_to_fcp_op(struct nvmefc_fcp_req *fcpreq)
+{
+ return container_of(fcpreq, struct nvme_fc_fcp_op, fcp_req);
+}
+
+
+
+/* *************************** Globals **************************** */
+
+
+static DEFINE_SPINLOCK(nvme_fc_lock);
+
+static LIST_HEAD(nvme_fc_lport_list);
+static DEFINE_IDA(nvme_fc_local_port_cnt);
+static DEFINE_IDA(nvme_fc_ctrl_cnt);
+
+
+
+
+/* *********************** FC-NVME Port Management ************************ */
+
+static int __nvme_fc_del_ctrl(struct nvme_fc_ctrl *);
+static void __nvme_fc_delete_hw_queue(struct nvme_fc_ctrl *,
+ struct nvme_fc_queue *, unsigned int);
+
+static void
+nvme_fc_free_lport(struct kref *ref)
+{
+ struct nvme_fc_lport *lport =
+ container_of(ref, struct nvme_fc_lport, ref);
+ unsigned long flags;
+
+ WARN_ON(lport->localport.port_state != FC_OBJSTATE_DELETED);
+ WARN_ON(!list_empty(&lport->endp_list));
+
+ /* remove from transport list */
+ spin_lock_irqsave(&nvme_fc_lock, flags);
+ list_del(&lport->port_list);
+ spin_unlock_irqrestore(&nvme_fc_lock, flags);
+
+ /* let the LLDD know we've finished tearing it down */
+ lport->ops->localport_delete(&lport->localport);
+
+ ida_simple_remove(&nvme_fc_local_port_cnt, lport->localport.port_num);
+ ida_destroy(&lport->endp_cnt);
+
+ put_device(lport->dev);
+
+ kfree(lport);
+}
+
+static void
+nvme_fc_lport_put(struct nvme_fc_lport *lport)
+{
+ kref_put(&lport->ref, nvme_fc_free_lport);
+}
+
+static int
+nvme_fc_lport_get(struct nvme_fc_lport *lport)
+{
+ return kref_get_unless_zero(&lport->ref);
+}
+
+
+static struct nvme_fc_lport *
+nvme_fc_attach_to_unreg_lport(struct nvme_fc_port_info *pinfo)
+{
+ struct nvme_fc_lport *lport;
+ unsigned long flags;
+
+ spin_lock_irqsave(&nvme_fc_lock, flags);
+
+ list_for_each_entry(lport, &nvme_fc_lport_list, port_list) {
+ if (lport->localport.node_name != pinfo->node_name ||
+ lport->localport.port_name != pinfo->port_name)
+ continue;
+
+ if (lport->localport.port_state != FC_OBJSTATE_DELETED) {
+ lport = ERR_PTR(-EEXIST);
+ goto out_done;
+ }
+
+ if (!nvme_fc_lport_get(lport)) {
+ /*
+ * fails if ref cnt already 0. If so,
+ * act as if lport already deleted
+ */
+ lport = NULL;
+ goto out_done;
+ }
+
+ /* resume the lport */
+
+ lport->localport.port_role = pinfo->port_role;
+ lport->localport.port_id = pinfo->port_id;
+ lport->localport.port_state = FC_OBJSTATE_ONLINE;
+
+ spin_unlock_irqrestore(&nvme_fc_lock, flags);
+
+ return lport;
+ }
+
+ lport = NULL;
+
+out_done:
+ spin_unlock_irqrestore(&nvme_fc_lock, flags);
+
+ return lport;
+}
+
+/**
+ * nvme_fc_register_localport - transport entry point called by an
+ * LLDD to register the existence of a NVME
+ * host FC port.
+ * @pinfo: pointer to information about the port to be registered
+ * @template: LLDD entrypoints and operational parameters for the port
+ * @dev: physical hardware device node port corresponds to. Will be
+ * used for DMA mappings
+ * @lport_p: pointer to a local port pointer. Upon success, the routine
+ * will allocate a nvme_fc_local_port structure and place its
+ * address in the local port pointer. Upon failure, local port
+ * pointer will be set to 0.
+ *
+ * Returns:
+ * a completion status. Must be 0 upon success; a negative errno
+ * (ex: -ENXIO) upon failure.
+ */
+int
+nvme_fc_register_localport(struct nvme_fc_port_info *pinfo,
+ struct nvme_fc_port_template *template,
+ struct device *dev,
+ struct nvme_fc_local_port **portptr)
+{
+ struct nvme_fc_lport *newrec;
+ unsigned long flags;
+ int ret, idx;
+
+ if (!template->localport_delete || !template->remoteport_delete ||
+ !template->ls_req || !template->fcp_io ||
+ !template->ls_abort || !template->fcp_abort ||
+ !template->max_hw_queues || !template->max_sgl_segments ||
+ !template->max_dif_sgl_segments || !template->dma_boundary) {
+ ret = -EINVAL;
+ goto out_reghost_failed;
+ }
+
+ /*
+ * look to see if there is already a localport that had been
+ * deregistered and in the process of waiting for all the
+ * references to fully be removed. If the references haven't
+ * expired, we can simply re-enable the localport. Remoteports
+ * and controller reconnections should resume naturally.
+ */
+ newrec = nvme_fc_attach_to_unreg_lport(pinfo);
+
+ /* found an lport, but something about its state is bad */
+ if (IS_ERR(newrec)) {
+ ret = PTR_ERR(newrec);
+ goto out_reghost_failed;
+
+ /* found existing lport, which was resumed */
+ } else if (newrec) {
+ *portptr = &newrec->localport;
+ return 0;
+ }
+
+ /* nothing found - allocate a new localport struct */
+
+ newrec = kmalloc((sizeof(*newrec) + template->local_priv_sz),
+ GFP_KERNEL);
+ if (!newrec) {
+ ret = -ENOMEM;
+ goto out_reghost_failed;
+ }
+
+ idx = ida_simple_get(&nvme_fc_local_port_cnt, 0, 0, GFP_KERNEL);
+ if (idx < 0) {
+ ret = -ENOSPC;
+ goto out_fail_kfree;
+ }
+
+ if (!get_device(dev) && dev) {
+ ret = -ENODEV;
+ goto out_ida_put;
+ }
+
+ INIT_LIST_HEAD(&newrec->port_list);
+ INIT_LIST_HEAD(&newrec->endp_list);
+ kref_init(&newrec->ref);
+ newrec->ops = template;
+ newrec->dev = dev;
+ ida_init(&newrec->endp_cnt);
+ newrec->localport.private = &newrec[1];
+ newrec->localport.node_name = pinfo->node_name;
+ newrec->localport.port_name = pinfo->port_name;
+ newrec->localport.port_role = pinfo->port_role;
+ newrec->localport.port_id = pinfo->port_id;
+ newrec->localport.port_state = FC_OBJSTATE_ONLINE;
+ newrec->localport.port_num = idx;
+
+ spin_lock_irqsave(&nvme_fc_lock, flags);
+ list_add_tail(&newrec->port_list, &nvme_fc_lport_list);
+ spin_unlock_irqrestore(&nvme_fc_lock, flags);
+
+ if (dev)
+ dma_set_seg_boundary(dev, template->dma_boundary);
+
+ *portptr = &newrec->localport;
+ return 0;
+
+out_ida_put:
+ ida_simple_remove(&nvme_fc_local_port_cnt, idx);
+out_fail_kfree:
+ kfree(newrec);
+out_reghost_failed:
+ *portptr = NULL;
+
+ return ret;
+}
+EXPORT_SYMBOL_GPL(nvme_fc_register_localport);
+
+/**
+ * nvme_fc_unregister_localport - transport entry point called by an
+ * LLDD to deregister/remove a previously
+ * registered a NVME host FC port.
+ * @localport: pointer to the (registered) local port that is to be
+ * deregistered.
+ *
+ * Returns:
+ * a completion status. Must be 0 upon success; a negative errno
+ * (ex: -ENXIO) upon failure.
+ */
+int
+nvme_fc_unregister_localport(struct nvme_fc_local_port *portptr)
+{
+ struct nvme_fc_lport *lport = localport_to_lport(portptr);
+ unsigned long flags;
+
+ if (!portptr)
+ return -EINVAL;
+
+ spin_lock_irqsave(&nvme_fc_lock, flags);
+
+ if (portptr->port_state != FC_OBJSTATE_ONLINE) {
+ spin_unlock_irqrestore(&nvme_fc_lock, flags);
+ return -EINVAL;
+ }
+ portptr->port_state = FC_OBJSTATE_DELETED;
+
+ spin_unlock_irqrestore(&nvme_fc_lock, flags);
+
+ nvme_fc_lport_put(lport);
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(nvme_fc_unregister_localport);
+
+/**
+ * nvme_fc_register_remoteport - transport entry point called by an
+ * LLDD to register the existence of a NVME
+ * subsystem FC port on its fabric.
+ * @localport: pointer to the (registered) local port that the remote
+ * subsystem port is connected to.
+ * @pinfo: pointer to information about the port to be registered
+ * @rport_p: pointer to a remote port pointer. Upon success, the routine
+ * will allocate a nvme_fc_remote_port structure and place its
+ * address in the remote port pointer. Upon failure, remote port
+ * pointer will be set to 0.
+ *
+ * Returns:
+ * a completion status. Must be 0 upon success; a negative errno
+ * (ex: -ENXIO) upon failure.
+ */
+int
+nvme_fc_register_remoteport(struct nvme_fc_local_port *localport,
+ struct nvme_fc_port_info *pinfo,
+ struct nvme_fc_remote_port **portptr)
+{
+ struct nvme_fc_lport *lport = localport_to_lport(localport);
+ struct nvme_fc_rport *newrec;
+ unsigned long flags;
+ int ret, idx;
+
+ newrec = kmalloc((sizeof(*newrec) + lport->ops->remote_priv_sz),
+ GFP_KERNEL);
+ if (!newrec) {
+ ret = -ENOMEM;
+ goto out_reghost_failed;
+ }
+
+ if (!nvme_fc_lport_get(lport)) {
+ ret = -ESHUTDOWN;
+ goto out_kfree_rport;
+ }
+
+ idx = ida_simple_get(&lport->endp_cnt, 0, 0, GFP_KERNEL);
+ if (idx < 0) {
+ ret = -ENOSPC;
+ goto out_lport_put;
+ }
+
+ INIT_LIST_HEAD(&newrec->endp_list);
+ INIT_LIST_HEAD(&newrec->ctrl_list);
+ INIT_LIST_HEAD(&newrec->ls_req_list);
+ kref_init(&newrec->ref);
+ spin_lock_init(&newrec->lock);
+ newrec->remoteport.localport = &lport->localport;
+ newrec->dev = lport->dev;
+ newrec->lport = lport;
+ newrec->remoteport.private = &newrec[1];
+ newrec->remoteport.port_role = pinfo->port_role;
+ newrec->remoteport.node_name = pinfo->node_name;
+ newrec->remoteport.port_name = pinfo->port_name;
+ newrec->remoteport.port_id = pinfo->port_id;
+ newrec->remoteport.port_state = FC_OBJSTATE_ONLINE;
+ newrec->remoteport.port_num = idx;
+
+ spin_lock_irqsave(&nvme_fc_lock, flags);
+ list_add_tail(&newrec->endp_list, &lport->endp_list);
+ spin_unlock_irqrestore(&nvme_fc_lock, flags);
+
+ *portptr = &newrec->remoteport;
+ return 0;
+
+out_lport_put:
+ nvme_fc_lport_put(lport);
+out_kfree_rport:
+ kfree(newrec);
+out_reghost_failed:
+ *portptr = NULL;
+ return ret;
+}
+EXPORT_SYMBOL_GPL(nvme_fc_register_remoteport);
+
+static void
+nvme_fc_free_rport(struct kref *ref)
+{
+ struct nvme_fc_rport *rport =
+ container_of(ref, struct nvme_fc_rport, ref);
+ struct nvme_fc_lport *lport =
+ localport_to_lport(rport->remoteport.localport);
+ unsigned long flags;
+
+ WARN_ON(rport->remoteport.port_state != FC_OBJSTATE_DELETED);
+ WARN_ON(!list_empty(&rport->ctrl_list));
+
+ /* remove from lport list */
+ spin_lock_irqsave(&nvme_fc_lock, flags);
+ list_del(&rport->endp_list);
+ spin_unlock_irqrestore(&nvme_fc_lock, flags);
+
+ /* let the LLDD know we've finished tearing it down */
+ lport->ops->remoteport_delete(&rport->remoteport);
+
+ ida_simple_remove(&lport->endp_cnt, rport->remoteport.port_num);
+
+ kfree(rport);
+
+ nvme_fc_lport_put(lport);
+}
+
+static void
+nvme_fc_rport_put(struct nvme_fc_rport *rport)
+{
+ kref_put(&rport->ref, nvme_fc_free_rport);
+}
+
+static int
+nvme_fc_rport_get(struct nvme_fc_rport *rport)
+{
+ return kref_get_unless_zero(&rport->ref);
+}
+
+static int
+nvme_fc_abort_lsops(struct nvme_fc_rport *rport)
+{
+ struct nvmefc_ls_req_op *lsop;
+ unsigned long flags;
+
+restart:
+ spin_lock_irqsave(&rport->lock, flags);
+
+ list_for_each_entry(lsop, &rport->ls_req_list, lsreq_list) {
+ if (!(lsop->flags & FCOP_FLAGS_TERMIO)) {
+ lsop->flags |= FCOP_FLAGS_TERMIO;
+ spin_unlock_irqrestore(&rport->lock, flags);
+ rport->lport->ops->ls_abort(&rport->lport->localport,
+ &rport->remoteport,
+ &lsop->ls_req);
+ goto restart;
+ }
+ }
+ spin_unlock_irqrestore(&rport->lock, flags);
+
+ return 0;
+}
+
+/**
+ * nvme_fc_unregister_remoteport - transport entry point called by an
+ * LLDD to deregister/remove a previously
+ * registered a NVME subsystem FC port.
+ * @remoteport: pointer to the (registered) remote port that is to be
+ * deregistered.
+ *
+ * Returns:
+ * a completion status. Must be 0 upon success; a negative errno
+ * (ex: -ENXIO) upon failure.
+ */
+int
+nvme_fc_unregister_remoteport(struct nvme_fc_remote_port *portptr)
+{
+ struct nvme_fc_rport *rport = remoteport_to_rport(portptr);
+ struct nvme_fc_ctrl *ctrl;
+ unsigned long flags;
+
+ if (!portptr)
+ return -EINVAL;
+
+ spin_lock_irqsave(&rport->lock, flags);
+
+ if (portptr->port_state != FC_OBJSTATE_ONLINE) {
+ spin_unlock_irqrestore(&rport->lock, flags);
+ return -EINVAL;
+ }
+ portptr->port_state = FC_OBJSTATE_DELETED;
+
+ /* tear down all associations to the remote port */
+ list_for_each_entry(ctrl, &rport->ctrl_list, ctrl_list)
+ __nvme_fc_del_ctrl(ctrl);
+
+ spin_unlock_irqrestore(&rport->lock, flags);
+
+ nvme_fc_abort_lsops(rport);
+
+ nvme_fc_rport_put(rport);
+ return 0;
+}
+EXPORT_SYMBOL_GPL(nvme_fc_unregister_remoteport);
+
+
+/* *********************** FC-NVME DMA Handling **************************** */
+
+/*
+ * The fcloop device passes in a NULL device pointer. Real LLD's will
+ * pass in a valid device pointer. If NULL is passed to the dma mapping
+ * routines, depending on the platform, it may or may not succeed, and
+ * may crash.
+ *
+ * As such:
+ * Wrapper all the dma routines and check the dev pointer.
+ *
+ * If simple mappings (return just a dma address, we'll noop them,
+ * returning a dma address of 0.
+ *
+ * On more complex mappings (dma_map_sg), a pseudo routine fills
+ * in the scatter list, setting all dma addresses to 0.
+ */
+
+static inline dma_addr_t
+fc_dma_map_single(struct device *dev, void *ptr, size_t size,
+ enum dma_data_direction dir)
+{
+ return dev ? dma_map_single(dev, ptr, size, dir) : (dma_addr_t)0L;
+}
+
+static inline int
+fc_dma_mapping_error(struct device *dev, dma_addr_t dma_addr)
+{
+ return dev ? dma_mapping_error(dev, dma_addr) : 0;
+}
+
+static inline void
+fc_dma_unmap_single(struct device *dev, dma_addr_t addr, size_t size,
+ enum dma_data_direction dir)
+{
+ if (dev)
+ dma_unmap_single(dev, addr, size, dir);
+}
+
+static inline void
+fc_dma_sync_single_for_cpu(struct device *dev, dma_addr_t addr, size_t size,
+ enum dma_data_direction dir)
+{
+ if (dev)
+ dma_sync_single_for_cpu(dev, addr, size, dir);
+}
+
+static inline void
+fc_dma_sync_single_for_device(struct device *dev, dma_addr_t addr, size_t size,
+ enum dma_data_direction dir)
+{
+ if (dev)
+ dma_sync_single_for_device(dev, addr, size, dir);
+}
+
+/* pseudo dma_map_sg call */
+static int
+fc_map_sg(struct scatterlist *sg, int nents)
+{
+ struct scatterlist *s;
+ int i;
+
+ WARN_ON(nents == 0 || sg[0].length == 0);
+
+ for_each_sg(sg, s, nents, i) {
+ s->dma_address = 0L;
+#ifdef CONFIG_NEED_SG_DMA_LENGTH
+ s->dma_length = s->length;
+#endif
+ }
+ return nents;
+}
+
+static inline int
+fc_dma_map_sg(struct device *dev, struct scatterlist *sg, int nents,
+ enum dma_data_direction dir)
+{
+ return dev ? dma_map_sg(dev, sg, nents, dir) : fc_map_sg(sg, nents);
+}
+
+static inline void
+fc_dma_unmap_sg(struct device *dev, struct scatterlist *sg, int nents,
+ enum dma_data_direction dir)
+{
+ if (dev)
+ dma_unmap_sg(dev, sg, nents, dir);
+}
+
+
+/* *********************** FC-NVME LS Handling **************************** */
+
+static void nvme_fc_ctrl_put(struct nvme_fc_ctrl *);
+static int nvme_fc_ctrl_get(struct nvme_fc_ctrl *);
+
+
+static void
+__nvme_fc_finish_ls_req(struct nvmefc_ls_req_op *lsop)
+{
+ struct nvme_fc_rport *rport = lsop->rport;
+ struct nvmefc_ls_req *lsreq = &lsop->ls_req;
+ unsigned long flags;
+
+ spin_lock_irqsave(&rport->lock, flags);
+
+ if (!lsop->req_queued) {
+ spin_unlock_irqrestore(&rport->lock, flags);
+ return;
+ }
+
+ list_del(&lsop->lsreq_list);
+
+ lsop->req_queued = false;
+
+ spin_unlock_irqrestore(&rport->lock, flags);
+
+ fc_dma_unmap_single(rport->dev, lsreq->rqstdma,
+ (lsreq->rqstlen + lsreq->rsplen),
+ DMA_BIDIRECTIONAL);
+
+ nvme_fc_rport_put(rport);
+}
+
+static int
+__nvme_fc_send_ls_req(struct nvme_fc_rport *rport,
+ struct nvmefc_ls_req_op *lsop,
+ void (*done)(struct nvmefc_ls_req *req, int status))
+{
+ struct nvmefc_ls_req *lsreq = &lsop->ls_req;
+ unsigned long flags;
+ int ret = 0;
+
+ if (rport->remoteport.port_state != FC_OBJSTATE_ONLINE)
+ return -ECONNREFUSED;
+
+ if (!nvme_fc_rport_get(rport))
+ return -ESHUTDOWN;
+
+ lsreq->done = done;
+ lsop->rport = rport;
+ lsop->req_queued = false;
+ INIT_LIST_HEAD(&lsop->lsreq_list);
+ init_completion(&lsop->ls_done);
+
+ lsreq->rqstdma = fc_dma_map_single(rport->dev, lsreq->rqstaddr,
+ lsreq->rqstlen + lsreq->rsplen,
+ DMA_BIDIRECTIONAL);
+ if (fc_dma_mapping_error(rport->dev, lsreq->rqstdma)) {
+ ret = -EFAULT;
+ goto out_putrport;
+ }
+ lsreq->rspdma = lsreq->rqstdma + lsreq->rqstlen;
+
+ spin_lock_irqsave(&rport->lock, flags);
+
+ list_add_tail(&lsop->lsreq_list, &rport->ls_req_list);
+
+ lsop->req_queued = true;
+
+ spin_unlock_irqrestore(&rport->lock, flags);
+
+ ret = rport->lport->ops->ls_req(&rport->lport->localport,
+ &rport->remoteport, lsreq);
+ if (ret)
+ goto out_unlink;
+
+ return 0;
+
+out_unlink:
+ lsop->ls_error = ret;
+ spin_lock_irqsave(&rport->lock, flags);
+ lsop->req_queued = false;
+ list_del(&lsop->lsreq_list);
+ spin_unlock_irqrestore(&rport->lock, flags);
+ fc_dma_unmap_single(rport->dev, lsreq->rqstdma,
+ (lsreq->rqstlen + lsreq->rsplen),
+ DMA_BIDIRECTIONAL);
+out_putrport:
+ nvme_fc_rport_put(rport);
+
+ return ret;
+}
+
+static void
+nvme_fc_send_ls_req_done(struct nvmefc_ls_req *lsreq, int status)
+{
+ struct nvmefc_ls_req_op *lsop = ls_req_to_lsop(lsreq);
+
+ lsop->ls_error = status;
+ complete(&lsop->ls_done);
+}
+
+static int
+nvme_fc_send_ls_req(struct nvme_fc_rport *rport, struct nvmefc_ls_req_op *lsop)
+{
+ struct nvmefc_ls_req *lsreq = &lsop->ls_req;
+ struct fcnvme_ls_rjt *rjt = lsreq->rspaddr;
+ int ret;
+
+ ret = __nvme_fc_send_ls_req(rport, lsop, nvme_fc_send_ls_req_done);
+
+ if (!ret) {
+ /*
+ * No timeout/not interruptible as we need the struct
+ * to exist until the lldd calls us back. Thus mandate
+ * wait until driver calls back. lldd responsible for
+ * the timeout action
+ */
+ wait_for_completion(&lsop->ls_done);
+
+ __nvme_fc_finish_ls_req(lsop);
+
+ ret = lsop->ls_error;
+ }
+
+ if (ret)
+ return ret;
+
+ /* ACC or RJT payload ? */
+ if (rjt->w0.ls_cmd == FCNVME_LS_RJT)
+ return -ENXIO;
+
+ return 0;
+}
+
+static int
+nvme_fc_send_ls_req_async(struct nvme_fc_rport *rport,
+ struct nvmefc_ls_req_op *lsop,
+ void (*done)(struct nvmefc_ls_req *req, int status))
+{
+ /* don't wait for completion */
+
+ return __nvme_fc_send_ls_req(rport, lsop, done);
+}
+
+/* Validation Error indexes into the string table below */
+enum {
+ VERR_NO_ERROR = 0,
+ VERR_LSACC = 1,
+ VERR_LSDESC_RQST = 2,
+ VERR_LSDESC_RQST_LEN = 3,
+ VERR_ASSOC_ID = 4,
+ VERR_ASSOC_ID_LEN = 5,
+ VERR_CONN_ID = 6,
+ VERR_CONN_ID_LEN = 7,
+ VERR_CR_ASSOC = 8,
+ VERR_CR_ASSOC_ACC_LEN = 9,
+ VERR_CR_CONN = 10,
+ VERR_CR_CONN_ACC_LEN = 11,
+ VERR_DISCONN = 12,
+ VERR_DISCONN_ACC_LEN = 13,
+};
+
+static char *validation_errors[] = {
+ "OK",
+ "Not LS_ACC",
+ "Not LSDESC_RQST",
+ "Bad LSDESC_RQST Length",
+ "Not Association ID",
+ "Bad Association ID Length",
+ "Not Connection ID",
+ "Bad Connection ID Length",
+ "Not CR_ASSOC Rqst",
+ "Bad CR_ASSOC ACC Length",
+ "Not CR_CONN Rqst",
+ "Bad CR_CONN ACC Length",
+ "Not Disconnect Rqst",
+ "Bad Disconnect ACC Length",
+};
+
+static int
+nvme_fc_connect_admin_queue(struct nvme_fc_ctrl *ctrl,
+ struct nvme_fc_queue *queue, u16 qsize, u16 ersp_ratio)
+{
+ struct nvmefc_ls_req_op *lsop;
+ struct nvmefc_ls_req *lsreq;
+ struct fcnvme_ls_cr_assoc_rqst *assoc_rqst;
+ struct fcnvme_ls_cr_assoc_acc *assoc_acc;
+ int ret, fcret = 0;
+
+ lsop = kzalloc((sizeof(*lsop) +
+ ctrl->lport->ops->lsrqst_priv_sz +
+ sizeof(*assoc_rqst) + sizeof(*assoc_acc)), GFP_KERNEL);
+ if (!lsop) {
+ ret = -ENOMEM;
+ goto out_no_memory;
+ }
+ lsreq = &lsop->ls_req;
+
+ lsreq->private = (void *)&lsop[1];
+ assoc_rqst = (struct fcnvme_ls_cr_assoc_rqst *)
+ (lsreq->private + ctrl->lport->ops->lsrqst_priv_sz);
+ assoc_acc = (struct fcnvme_ls_cr_assoc_acc *)&assoc_rqst[1];
+
+ assoc_rqst->w0.ls_cmd = FCNVME_LS_CREATE_ASSOCIATION;
+ assoc_rqst->desc_list_len =
+ cpu_to_be32(sizeof(struct fcnvme_lsdesc_cr_assoc_cmd));
+
+ assoc_rqst->assoc_cmd.desc_tag =
+ cpu_to_be32(FCNVME_LSDESC_CREATE_ASSOC_CMD);
+ assoc_rqst->assoc_cmd.desc_len =
+ fcnvme_lsdesc_len(
+ sizeof(struct fcnvme_lsdesc_cr_assoc_cmd));
+
+ assoc_rqst->assoc_cmd.ersp_ratio = cpu_to_be16(ersp_ratio);
+ assoc_rqst->assoc_cmd.sqsize = cpu_to_be16(qsize);
+ /* Linux supports only Dynamic controllers */
+ assoc_rqst->assoc_cmd.cntlid = cpu_to_be16(0xffff);
+ uuid_copy(&assoc_rqst->assoc_cmd.hostid, &ctrl->ctrl.opts->host->id);
+ strncpy(assoc_rqst->assoc_cmd.hostnqn, ctrl->ctrl.opts->host->nqn,
+ min(FCNVME_ASSOC_HOSTNQN_LEN, NVMF_NQN_SIZE));
+ strncpy(assoc_rqst->assoc_cmd.subnqn, ctrl->ctrl.opts->subsysnqn,
+ min(FCNVME_ASSOC_SUBNQN_LEN, NVMF_NQN_SIZE));
+
+ lsop->queue = queue;
+ lsreq->rqstaddr = assoc_rqst;
+ lsreq->rqstlen = sizeof(*assoc_rqst);
+ lsreq->rspaddr = assoc_acc;
+ lsreq->rsplen = sizeof(*assoc_acc);
+ lsreq->timeout = NVME_FC_CONNECT_TIMEOUT_SEC;
+
+ ret = nvme_fc_send_ls_req(ctrl->rport, lsop);
+ if (ret)
+ goto out_free_buffer;
+
+ /* process connect LS completion */
+
+ /* validate the ACC response */
+ if (assoc_acc->hdr.w0.ls_cmd != FCNVME_LS_ACC)
+ fcret = VERR_LSACC;
+ else if (assoc_acc->hdr.desc_list_len !=
+ fcnvme_lsdesc_len(
+ sizeof(struct fcnvme_ls_cr_assoc_acc)))
+ fcret = VERR_CR_ASSOC_ACC_LEN;
+ else if (assoc_acc->hdr.rqst.desc_tag !=
+ cpu_to_be32(FCNVME_LSDESC_RQST))
+ fcret = VERR_LSDESC_RQST;
+ else if (assoc_acc->hdr.rqst.desc_len !=
+ fcnvme_lsdesc_len(sizeof(struct fcnvme_lsdesc_rqst)))
+ fcret = VERR_LSDESC_RQST_LEN;
+ else if (assoc_acc->hdr.rqst.w0.ls_cmd != FCNVME_LS_CREATE_ASSOCIATION)
+ fcret = VERR_CR_ASSOC;
+ else if (assoc_acc->associd.desc_tag !=
+ cpu_to_be32(FCNVME_LSDESC_ASSOC_ID))
+ fcret = VERR_ASSOC_ID;
+ else if (assoc_acc->associd.desc_len !=
+ fcnvme_lsdesc_len(
+ sizeof(struct fcnvme_lsdesc_assoc_id)))
+ fcret = VERR_ASSOC_ID_LEN;
+ else if (assoc_acc->connectid.desc_tag !=
+ cpu_to_be32(FCNVME_LSDESC_CONN_ID))
+ fcret = VERR_CONN_ID;
+ else if (assoc_acc->connectid.desc_len !=
+ fcnvme_lsdesc_len(sizeof(struct fcnvme_lsdesc_conn_id)))
+ fcret = VERR_CONN_ID_LEN;
+
+ if (fcret) {
+ ret = -EBADF;
+ dev_err(ctrl->dev,
+ "q %d connect failed: %s\n",
+ queue->qnum, validation_errors[fcret]);
+ } else {
+ ctrl->association_id =
+ be64_to_cpu(assoc_acc->associd.association_id);
+ queue->connection_id =
+ be64_to_cpu(assoc_acc->connectid.connection_id);
+ set_bit(NVME_FC_Q_CONNECTED, &queue->flags);
+ }
+
+out_free_buffer:
+ kfree(lsop);
+out_no_memory:
+ if (ret)
+ dev_err(ctrl->dev,
+ "queue %d connect admin queue failed (%d).\n",
+ queue->qnum, ret);
+ return ret;
+}
+
+static int
+nvme_fc_connect_queue(struct nvme_fc_ctrl *ctrl, struct nvme_fc_queue *queue,
+ u16 qsize, u16 ersp_ratio)
+{
+ struct nvmefc_ls_req_op *lsop;
+ struct nvmefc_ls_req *lsreq;
+ struct fcnvme_ls_cr_conn_rqst *conn_rqst;
+ struct fcnvme_ls_cr_conn_acc *conn_acc;
+ int ret, fcret = 0;
+
+ lsop = kzalloc((sizeof(*lsop) +
+ ctrl->lport->ops->lsrqst_priv_sz +
+ sizeof(*conn_rqst) + sizeof(*conn_acc)), GFP_KERNEL);
+ if (!lsop) {
+ ret = -ENOMEM;
+ goto out_no_memory;
+ }
+ lsreq = &lsop->ls_req;
+
+ lsreq->private = (void *)&lsop[1];
+ conn_rqst = (struct fcnvme_ls_cr_conn_rqst *)
+ (lsreq->private + ctrl->lport->ops->lsrqst_priv_sz);
+ conn_acc = (struct fcnvme_ls_cr_conn_acc *)&conn_rqst[1];
+
+ conn_rqst->w0.ls_cmd = FCNVME_LS_CREATE_CONNECTION;
+ conn_rqst->desc_list_len = cpu_to_be32(
+ sizeof(struct fcnvme_lsdesc_assoc_id) +
+ sizeof(struct fcnvme_lsdesc_cr_conn_cmd));
+
+ conn_rqst->associd.desc_tag = cpu_to_be32(FCNVME_LSDESC_ASSOC_ID);
+ conn_rqst->associd.desc_len =
+ fcnvme_lsdesc_len(
+ sizeof(struct fcnvme_lsdesc_assoc_id));
+ conn_rqst->associd.association_id = cpu_to_be64(ctrl->association_id);
+ conn_rqst->connect_cmd.desc_tag =
+ cpu_to_be32(FCNVME_LSDESC_CREATE_CONN_CMD);
+ conn_rqst->connect_cmd.desc_len =
+ fcnvme_lsdesc_len(
+ sizeof(struct fcnvme_lsdesc_cr_conn_cmd));
+ conn_rqst->connect_cmd.ersp_ratio = cpu_to_be16(ersp_ratio);
+ conn_rqst->connect_cmd.qid = cpu_to_be16(queue->qnum);
+ conn_rqst->connect_cmd.sqsize = cpu_to_be16(qsize);
+
+ lsop->queue = queue;
+ lsreq->rqstaddr = conn_rqst;
+ lsreq->rqstlen = sizeof(*conn_rqst);
+ lsreq->rspaddr = conn_acc;
+ lsreq->rsplen = sizeof(*conn_acc);
+ lsreq->timeout = NVME_FC_CONNECT_TIMEOUT_SEC;
+
+ ret = nvme_fc_send_ls_req(ctrl->rport, lsop);
+ if (ret)
+ goto out_free_buffer;
+
+ /* process connect LS completion */
+
+ /* validate the ACC response */
+ if (conn_acc->hdr.w0.ls_cmd != FCNVME_LS_ACC)
+ fcret = VERR_LSACC;
+ else if (conn_acc->hdr.desc_list_len !=
+ fcnvme_lsdesc_len(sizeof(struct fcnvme_ls_cr_conn_acc)))
+ fcret = VERR_CR_CONN_ACC_LEN;
+ else if (conn_acc->hdr.rqst.desc_tag != cpu_to_be32(FCNVME_LSDESC_RQST))
+ fcret = VERR_LSDESC_RQST;
+ else if (conn_acc->hdr.rqst.desc_len !=
+ fcnvme_lsdesc_len(sizeof(struct fcnvme_lsdesc_rqst)))
+ fcret = VERR_LSDESC_RQST_LEN;
+ else if (conn_acc->hdr.rqst.w0.ls_cmd != FCNVME_LS_CREATE_CONNECTION)
+ fcret = VERR_CR_CONN;
+ else if (conn_acc->connectid.desc_tag !=
+ cpu_to_be32(FCNVME_LSDESC_CONN_ID))
+ fcret = VERR_CONN_ID;
+ else if (conn_acc->connectid.desc_len !=
+ fcnvme_lsdesc_len(sizeof(struct fcnvme_lsdesc_conn_id)))
+ fcret = VERR_CONN_ID_LEN;
+
+ if (fcret) {
+ ret = -EBADF;
+ dev_err(ctrl->dev,
+ "q %d connect failed: %s\n",
+ queue->qnum, validation_errors[fcret]);
+ } else {
+ queue->connection_id =
+ be64_to_cpu(conn_acc->connectid.connection_id);
+ set_bit(NVME_FC_Q_CONNECTED, &queue->flags);
+ }
+
+out_free_buffer:
+ kfree(lsop);
+out_no_memory:
+ if (ret)
+ dev_err(ctrl->dev,
+ "queue %d connect command failed (%d).\n",
+ queue->qnum, ret);
+ return ret;
+}
+
+static void
+nvme_fc_disconnect_assoc_done(struct nvmefc_ls_req *lsreq, int status)
+{
+ struct nvmefc_ls_req_op *lsop = ls_req_to_lsop(lsreq);
+
+ __nvme_fc_finish_ls_req(lsop);
+
+ /* fc-nvme iniator doesn't care about success or failure of cmd */
+
+ kfree(lsop);
+}
+
+/*
+ * This routine sends a FC-NVME LS to disconnect (aka terminate)
+ * the FC-NVME Association. Terminating the association also
+ * terminates the FC-NVME connections (per queue, both admin and io
+ * queues) that are part of the association. E.g. things are torn
+ * down, and the related FC-NVME Association ID and Connection IDs
+ * become invalid.
+ *
+ * The behavior of the fc-nvme initiator is such that it's
+ * understanding of the association and connections will implicitly
+ * be torn down. The action is implicit as it may be due to a loss of
+ * connectivity with the fc-nvme target, so you may never get a
+ * response even if you tried. As such, the action of this routine
+ * is to asynchronously send the LS, ignore any results of the LS, and
+ * continue on with terminating the association. If the fc-nvme target
+ * is present and receives the LS, it too can tear down.
+ */
+static void
+nvme_fc_xmt_disconnect_assoc(struct nvme_fc_ctrl *ctrl)
+{
+ struct fcnvme_ls_disconnect_rqst *discon_rqst;
+ struct fcnvme_ls_disconnect_acc *discon_acc;
+ struct nvmefc_ls_req_op *lsop;
+ struct nvmefc_ls_req *lsreq;
+ int ret;
+
+ lsop = kzalloc((sizeof(*lsop) +
+ ctrl->lport->ops->lsrqst_priv_sz +
+ sizeof(*discon_rqst) + sizeof(*discon_acc)),
+ GFP_KERNEL);
+ if (!lsop)
+ /* couldn't sent it... too bad */
+ return;
+
+ lsreq = &lsop->ls_req;
+
+ lsreq->private = (void *)&lsop[1];
+ discon_rqst = (struct fcnvme_ls_disconnect_rqst *)
+ (lsreq->private + ctrl->lport->ops->lsrqst_priv_sz);
+ discon_acc = (struct fcnvme_ls_disconnect_acc *)&discon_rqst[1];
+
+ discon_rqst->w0.ls_cmd = FCNVME_LS_DISCONNECT;
+ discon_rqst->desc_list_len = cpu_to_be32(
+ sizeof(struct fcnvme_lsdesc_assoc_id) +
+ sizeof(struct fcnvme_lsdesc_disconn_cmd));
+
+ discon_rqst->associd.desc_tag = cpu_to_be32(FCNVME_LSDESC_ASSOC_ID);
+ discon_rqst->associd.desc_len =
+ fcnvme_lsdesc_len(
+ sizeof(struct fcnvme_lsdesc_assoc_id));
+
+ discon_rqst->associd.association_id = cpu_to_be64(ctrl->association_id);
+
+ discon_rqst->discon_cmd.desc_tag = cpu_to_be32(
+ FCNVME_LSDESC_DISCONN_CMD);
+ discon_rqst->discon_cmd.desc_len =
+ fcnvme_lsdesc_len(
+ sizeof(struct fcnvme_lsdesc_disconn_cmd));
+ discon_rqst->discon_cmd.scope = FCNVME_DISCONN_ASSOCIATION;
+ discon_rqst->discon_cmd.id = cpu_to_be64(ctrl->association_id);
+
+ lsreq->rqstaddr = discon_rqst;
+ lsreq->rqstlen = sizeof(*discon_rqst);
+ lsreq->rspaddr = discon_acc;
+ lsreq->rsplen = sizeof(*discon_acc);
+ lsreq->timeout = NVME_FC_CONNECT_TIMEOUT_SEC;
+
+ ret = nvme_fc_send_ls_req_async(ctrl->rport, lsop,
+ nvme_fc_disconnect_assoc_done);
+ if (ret)
+ kfree(lsop);
+
+ /* only meaningful part to terminating the association */
+ ctrl->association_id = 0;
+}
+
+
+/* *********************** NVME Ctrl Routines **************************** */
+
+static void __nvme_fc_final_op_cleanup(struct request *rq);
+static void nvme_fc_error_recovery(struct nvme_fc_ctrl *ctrl, char *errmsg);
+
+static int
+nvme_fc_reinit_request(void *data, struct request *rq)
+{
+ struct nvme_fc_fcp_op *op = blk_mq_rq_to_pdu(rq);
+ struct nvme_fc_cmd_iu *cmdiu = &op->cmd_iu;
+
+ memset(cmdiu, 0, sizeof(*cmdiu));
+ cmdiu->scsi_id = NVME_CMD_SCSI_ID;
+ cmdiu->fc_id = NVME_CMD_FC_ID;
+ cmdiu->iu_len = cpu_to_be16(sizeof(*cmdiu) / sizeof(u32));
+ memset(&op->rsp_iu, 0, sizeof(op->rsp_iu));
+
+ return 0;
+}
+
+static void
+__nvme_fc_exit_request(struct nvme_fc_ctrl *ctrl,
+ struct nvme_fc_fcp_op *op)
+{
+ fc_dma_unmap_single(ctrl->lport->dev, op->fcp_req.rspdma,
+ sizeof(op->rsp_iu), DMA_FROM_DEVICE);
+ fc_dma_unmap_single(ctrl->lport->dev, op->fcp_req.cmddma,
+ sizeof(op->cmd_iu), DMA_TO_DEVICE);
+
+ atomic_set(&op->state, FCPOP_STATE_UNINIT);
+}
+
+static void
+nvme_fc_exit_request(struct blk_mq_tag_set *set, struct request *rq,
+ unsigned int hctx_idx)
+{
+ struct nvme_fc_fcp_op *op = blk_mq_rq_to_pdu(rq);
+
+ return __nvme_fc_exit_request(set->driver_data, op);
+}
+
+static int
+__nvme_fc_abort_op(struct nvme_fc_ctrl *ctrl, struct nvme_fc_fcp_op *op)
+{
+ int state;
+
+ state = atomic_xchg(&op->state, FCPOP_STATE_ABORTED);
+ if (state != FCPOP_STATE_ACTIVE) {
+ atomic_set(&op->state, state);
+ return -ECANCELED;
+ }
+
+ ctrl->lport->ops->fcp_abort(&ctrl->lport->localport,
+ &ctrl->rport->remoteport,
+ op->queue->lldd_handle,
+ &op->fcp_req);
+
+ return 0;
+}
+
+static void
+nvme_fc_abort_aen_ops(struct nvme_fc_ctrl *ctrl)
+{
+ struct nvme_fc_fcp_op *aen_op = ctrl->aen_ops;
+ unsigned long flags;
+ int i, ret;
+
+ for (i = 0; i < NVME_FC_NR_AEN_COMMANDS; i++, aen_op++) {
+ if (atomic_read(&aen_op->state) != FCPOP_STATE_ACTIVE)
+ continue;
+
+ spin_lock_irqsave(&ctrl->lock, flags);
+ if (ctrl->flags & FCCTRL_TERMIO) {
+ ctrl->iocnt++;
+ aen_op->flags |= FCOP_FLAGS_TERMIO;
+ }
+ spin_unlock_irqrestore(&ctrl->lock, flags);
+
+ ret = __nvme_fc_abort_op(ctrl, aen_op);
+ if (ret) {
+ /*
+ * if __nvme_fc_abort_op failed the io wasn't
+ * active. Thus this call path is running in
+ * parallel to the io complete. Treat as non-error.
+ */
+
+ /* back out the flags/counters */
+ spin_lock_irqsave(&ctrl->lock, flags);
+ if (ctrl->flags & FCCTRL_TERMIO)
+ ctrl->iocnt--;
+ aen_op->flags &= ~FCOP_FLAGS_TERMIO;
+ spin_unlock_irqrestore(&ctrl->lock, flags);
+ return;
+ }
+ }
+}
+
+static inline int
+__nvme_fc_fcpop_chk_teardowns(struct nvme_fc_ctrl *ctrl,
+ struct nvme_fc_fcp_op *op)
+{
+ unsigned long flags;
+ bool complete_rq = false;
+
+ spin_lock_irqsave(&ctrl->lock, flags);
+ if (unlikely(op->flags & FCOP_FLAGS_TERMIO)) {
+ if (ctrl->flags & FCCTRL_TERMIO) {
+ if (!--ctrl->iocnt)
+ wake_up(&ctrl->ioabort_wait);
+ }
+ }
+ if (op->flags & FCOP_FLAGS_RELEASED)
+ complete_rq = true;
+ else
+ op->flags |= FCOP_FLAGS_COMPLETE;
+ spin_unlock_irqrestore(&ctrl->lock, flags);
+
+ return complete_rq;
+}
+
+static void
+nvme_fc_fcpio_done(struct nvmefc_fcp_req *req)
+{
+ struct nvme_fc_fcp_op *op = fcp_req_to_fcp_op(req);
+ struct request *rq = op->rq;
+ struct nvmefc_fcp_req *freq = &op->fcp_req;
+ struct nvme_fc_ctrl *ctrl = op->ctrl;
+ struct nvme_fc_queue *queue = op->queue;
+ struct nvme_completion *cqe = &op->rsp_iu.cqe;
+ struct nvme_command *sqe = &op->cmd_iu.sqe;
+ __le16 status = cpu_to_le16(NVME_SC_SUCCESS << 1);
+ union nvme_result result;
+ bool complete_rq, terminate_assoc = true;
+
+ /*
+ * WARNING:
+ * The current linux implementation of a nvme controller
+ * allocates a single tag set for all io queues and sizes
+ * the io queues to fully hold all possible tags. Thus, the
+ * implementation does not reference or care about the sqhd
+ * value as it never needs to use the sqhd/sqtail pointers
+ * for submission pacing.
+ *
+ * This affects the FC-NVME implementation in two ways:
+ * 1) As the value doesn't matter, we don't need to waste
+ * cycles extracting it from ERSPs and stamping it in the
+ * cases where the transport fabricates CQEs on successful
+ * completions.
+ * 2) The FC-NVME implementation requires that delivery of
+ * ERSP completions are to go back to the nvme layer in order
+ * relative to the rsn, such that the sqhd value will always
+ * be "in order" for the nvme layer. As the nvme layer in
+ * linux doesn't care about sqhd, there's no need to return
+ * them in order.
+ *
+ * Additionally:
+ * As the core nvme layer in linux currently does not look at
+ * every field in the cqe - in cases where the FC transport must
+ * fabricate a CQE, the following fields will not be set as they
+ * are not referenced:
+ * cqe.sqid, cqe.sqhd, cqe.command_id
+ *
+ * Failure or error of an individual i/o, in a transport
+ * detected fashion unrelated to the nvme completion status,
+ * potentially cause the initiator and target sides to get out
+ * of sync on SQ head/tail (aka outstanding io count allowed).
+ * Per FC-NVME spec, failure of an individual command requires
+ * the connection to be terminated, which in turn requires the
+ * association to be terminated.
+ */
+
+ fc_dma_sync_single_for_cpu(ctrl->lport->dev, op->fcp_req.rspdma,
+ sizeof(op->rsp_iu), DMA_FROM_DEVICE);
+
+ if (atomic_read(&op->state) == FCPOP_STATE_ABORTED)
+ status = cpu_to_le16((NVME_SC_ABORT_REQ | NVME_SC_DNR) << 1);
+ else if (freq->status)
+ status = cpu_to_le16(NVME_SC_INTERNAL << 1);
+
+ /*
+ * For the linux implementation, if we have an unsuccesful
+ * status, they blk-mq layer can typically be called with the
+ * non-zero status and the content of the cqe isn't important.
+ */
+ if (status)
+ goto done;
+
+ /*
+ * command completed successfully relative to the wire
+ * protocol. However, validate anything received and
+ * extract the status and result from the cqe (create it
+ * where necessary).
+ */
+
+ switch (freq->rcv_rsplen) {
+
+ case 0:
+ case NVME_FC_SIZEOF_ZEROS_RSP:
+ /*
+ * No response payload or 12 bytes of payload (which
+ * should all be zeros) are considered successful and
+ * no payload in the CQE by the transport.
+ */
+ if (freq->transferred_length !=
+ be32_to_cpu(op->cmd_iu.data_len)) {
+ status = cpu_to_le16(NVME_SC_INTERNAL << 1);
+ goto done;
+ }
+ result.u64 = 0;
+ break;
+
+ case sizeof(struct nvme_fc_ersp_iu):
+ /*
+ * The ERSP IU contains a full completion with CQE.
+ * Validate ERSP IU and look at cqe.
+ */
+ if (unlikely(be16_to_cpu(op->rsp_iu.iu_len) !=
+ (freq->rcv_rsplen / 4) ||
+ be32_to_cpu(op->rsp_iu.xfrd_len) !=
+ freq->transferred_length ||
+ op->rsp_iu.status_code ||
+ sqe->common.command_id != cqe->command_id)) {
+ status = cpu_to_le16(NVME_SC_INTERNAL << 1);
+ goto done;
+ }
+ result = cqe->result;
+ status = cqe->status;
+ break;
+
+ default:
+ status = cpu_to_le16(NVME_SC_INTERNAL << 1);
+ goto done;
+ }
+
+ terminate_assoc = false;
+
+done:
+ if (op->flags & FCOP_FLAGS_AEN) {
+ nvme_complete_async_event(&queue->ctrl->ctrl, status, &result);
+ complete_rq = __nvme_fc_fcpop_chk_teardowns(ctrl, op);
+ atomic_set(&op->state, FCPOP_STATE_IDLE);
+ op->flags = FCOP_FLAGS_AEN; /* clear other flags */
+ nvme_fc_ctrl_put(ctrl);
+ goto check_error;
+ }
+
+ complete_rq = __nvme_fc_fcpop_chk_teardowns(ctrl, op);
+ if (!complete_rq) {
+ if (unlikely(op->flags & FCOP_FLAGS_TERMIO)) {
+ status = cpu_to_le16(NVME_SC_ABORT_REQ << 1);
+ if (blk_queue_dying(rq->q))
+ status |= cpu_to_le16(NVME_SC_DNR << 1);
+ }
+ nvme_end_request(rq, status, result);
+ } else
+ __nvme_fc_final_op_cleanup(rq);
+
+check_error:
+ if (terminate_assoc)
+ nvme_fc_error_recovery(ctrl, "transport detected io error");
+}
+
+static int
+__nvme_fc_init_request(struct nvme_fc_ctrl *ctrl,
+ struct nvme_fc_queue *queue, struct nvme_fc_fcp_op *op,
+ struct request *rq, u32 rqno)
+{
+ struct nvme_fc_cmd_iu *cmdiu = &op->cmd_iu;
+ int ret = 0;
+
+ memset(op, 0, sizeof(*op));
+ op->fcp_req.cmdaddr = &op->cmd_iu;
+ op->fcp_req.cmdlen = sizeof(op->cmd_iu);
+ op->fcp_req.rspaddr = &op->rsp_iu;
+ op->fcp_req.rsplen = sizeof(op->rsp_iu);
+ op->fcp_req.done = nvme_fc_fcpio_done;
+ op->fcp_req.first_sgl = (struct scatterlist *)&op[1];
+ op->fcp_req.private = &op->fcp_req.first_sgl[SG_CHUNK_SIZE];
+ op->ctrl = ctrl;
+ op->queue = queue;
+ op->rq = rq;
+ op->rqno = rqno;
+
+ cmdiu->scsi_id = NVME_CMD_SCSI_ID;
+ cmdiu->fc_id = NVME_CMD_FC_ID;
+ cmdiu->iu_len = cpu_to_be16(sizeof(*cmdiu) / sizeof(u32));
+
+ op->fcp_req.cmddma = fc_dma_map_single(ctrl->lport->dev,
+ &op->cmd_iu, sizeof(op->cmd_iu), DMA_TO_DEVICE);
+ if (fc_dma_mapping_error(ctrl->lport->dev, op->fcp_req.cmddma)) {
+ dev_err(ctrl->dev,
+ "FCP Op failed - cmdiu dma mapping failed.\n");
+ ret = -EFAULT;
+ goto out_on_error;
+ }
+
+ op->fcp_req.rspdma = fc_dma_map_single(ctrl->lport->dev,
+ &op->rsp_iu, sizeof(op->rsp_iu),
+ DMA_FROM_DEVICE);
+ if (fc_dma_mapping_error(ctrl->lport->dev, op->fcp_req.rspdma)) {
+ dev_err(ctrl->dev,
+ "FCP Op failed - rspiu dma mapping failed.\n");
+ ret = -EFAULT;
+ }
+
+ atomic_set(&op->state, FCPOP_STATE_IDLE);
+out_on_error:
+ return ret;
+}
+
+static int
+nvme_fc_init_request(struct blk_mq_tag_set *set, struct request *rq,
+ unsigned int hctx_idx, unsigned int numa_node)
+{
+ struct nvme_fc_ctrl *ctrl = set->driver_data;
+ struct nvme_fc_fcp_op *op = blk_mq_rq_to_pdu(rq);
+ int queue_idx = (set == &ctrl->tag_set) ? hctx_idx + 1 : 0;
+ struct nvme_fc_queue *queue = &ctrl->queues[queue_idx];
+
+ return __nvme_fc_init_request(ctrl, queue, op, rq, queue->rqcnt++);
+}
+
+static int
+nvme_fc_init_aen_ops(struct nvme_fc_ctrl *ctrl)
+{
+ struct nvme_fc_fcp_op *aen_op;
+ struct nvme_fc_cmd_iu *cmdiu;
+ struct nvme_command *sqe;
+ void *private;
+ int i, ret;
+
+ aen_op = ctrl->aen_ops;
+ for (i = 0; i < NVME_FC_NR_AEN_COMMANDS; i++, aen_op++) {
+ private = kzalloc(ctrl->lport->ops->fcprqst_priv_sz,
+ GFP_KERNEL);
+ if (!private)
+ return -ENOMEM;
+
+ cmdiu = &aen_op->cmd_iu;
+ sqe = &cmdiu->sqe;
+ ret = __nvme_fc_init_request(ctrl, &ctrl->queues[0],
+ aen_op, (struct request *)NULL,
+ (AEN_CMDID_BASE + i));
+ if (ret) {
+ kfree(private);
+ return ret;
+ }
+
+ aen_op->flags = FCOP_FLAGS_AEN;
+ aen_op->fcp_req.first_sgl = NULL; /* no sg list */
+ aen_op->fcp_req.private = private;
+
+ memset(sqe, 0, sizeof(*sqe));
+ sqe->common.opcode = nvme_admin_async_event;
+ /* Note: core layer may overwrite the sqe.command_id value */
+ sqe->common.command_id = AEN_CMDID_BASE + i;
+ }
+ return 0;
+}
+
+static void
+nvme_fc_term_aen_ops(struct nvme_fc_ctrl *ctrl)
+{
+ struct nvme_fc_fcp_op *aen_op;
+ int i;
+
+ cancel_work_sync(&ctrl->ctrl.async_event_work);
+ aen_op = ctrl->aen_ops;
+ for (i = 0; i < NVME_FC_NR_AEN_COMMANDS; i++, aen_op++) {
+ if (!aen_op->fcp_req.private)
+ continue;
+
+ __nvme_fc_exit_request(ctrl, aen_op);
+
+ kfree(aen_op->fcp_req.private);
+ aen_op->fcp_req.private = NULL;
+ }
+}
+
+static inline void
+__nvme_fc_init_hctx(struct blk_mq_hw_ctx *hctx, struct nvme_fc_ctrl *ctrl,
+ unsigned int qidx)
+{
+ struct nvme_fc_queue *queue = &ctrl->queues[qidx];
+
+ hctx->driver_data = queue;
+ queue->hctx = hctx;
+}
+
+static int
+nvme_fc_init_hctx(struct blk_mq_hw_ctx *hctx, void *data,
+ unsigned int hctx_idx)
+{
+ struct nvme_fc_ctrl *ctrl = data;
+
+ __nvme_fc_init_hctx(hctx, ctrl, hctx_idx + 1);
+
+ return 0;
+}
+
+static int
+nvme_fc_init_admin_hctx(struct blk_mq_hw_ctx *hctx, void *data,
+ unsigned int hctx_idx)
+{
+ struct nvme_fc_ctrl *ctrl = data;
+
+ __nvme_fc_init_hctx(hctx, ctrl, hctx_idx);
+
+ return 0;
+}
+
+static void
+nvme_fc_init_queue(struct nvme_fc_ctrl *ctrl, int idx, size_t queue_size)
+{
+ struct nvme_fc_queue *queue;
+
+ queue = &ctrl->queues[idx];
+ memset(queue, 0, sizeof(*queue));
+ queue->ctrl = ctrl;
+ queue->qnum = idx;
+ atomic_set(&queue->csn, 1);
+ queue->dev = ctrl->dev;
+
+ if (idx > 0)
+ queue->cmnd_capsule_len = ctrl->ctrl.ioccsz * 16;
+ else
+ queue->cmnd_capsule_len = sizeof(struct nvme_command);
+
+ queue->queue_size = queue_size;
+
+ /*
+ * Considered whether we should allocate buffers for all SQEs
+ * and CQEs and dma map them - mapping their respective entries
+ * into the request structures (kernel vm addr and dma address)
+ * thus the driver could use the buffers/mappings directly.
+ * It only makes sense if the LLDD would use them for its
+ * messaging api. It's very unlikely most adapter api's would use
+ * a native NVME sqe/cqe. More reasonable if FC-NVME IU payload
+ * structures were used instead.
+ */
+}
+
+/*
+ * This routine terminates a queue at the transport level.
+ * The transport has already ensured that all outstanding ios on
+ * the queue have been terminated.
+ * The transport will send a Disconnect LS request to terminate
+ * the queue's connection. Termination of the admin queue will also
+ * terminate the association at the target.
+ */
+static void
+nvme_fc_free_queue(struct nvme_fc_queue *queue)
+{
+ if (!test_and_clear_bit(NVME_FC_Q_CONNECTED, &queue->flags))
+ return;
+
+ clear_bit(NVME_FC_Q_LIVE, &queue->flags);
+ /*
+ * Current implementation never disconnects a single queue.
+ * It always terminates a whole association. So there is never
+ * a disconnect(queue) LS sent to the target.
+ */
+
+ queue->connection_id = 0;
+}
+
+static void
+__nvme_fc_delete_hw_queue(struct nvme_fc_ctrl *ctrl,
+ struct nvme_fc_queue *queue, unsigned int qidx)
+{
+ if (ctrl->lport->ops->delete_queue)
+ ctrl->lport->ops->delete_queue(&ctrl->lport->localport, qidx,
+ queue->lldd_handle);
+ queue->lldd_handle = NULL;
+}
+
+static void
+nvme_fc_free_io_queues(struct nvme_fc_ctrl *ctrl)
+{
+ int i;
+
+ for (i = 1; i < ctrl->ctrl.queue_count; i++)
+ nvme_fc_free_queue(&ctrl->queues[i]);
+}
+
+static int
+__nvme_fc_create_hw_queue(struct nvme_fc_ctrl *ctrl,
+ struct nvme_fc_queue *queue, unsigned int qidx, u16 qsize)
+{
+ int ret = 0;
+
+ queue->lldd_handle = NULL;
+ if (ctrl->lport->ops->create_queue)
+ ret = ctrl->lport->ops->create_queue(&ctrl->lport->localport,
+ qidx, qsize, &queue->lldd_handle);
+
+ return ret;
+}
+
+static void
+nvme_fc_delete_hw_io_queues(struct nvme_fc_ctrl *ctrl)
+{
+ struct nvme_fc_queue *queue = &ctrl->queues[ctrl->ctrl.queue_count - 1];
+ int i;
+
+ for (i = ctrl->ctrl.queue_count - 1; i >= 1; i--, queue--)
+ __nvme_fc_delete_hw_queue(ctrl, queue, i);
+}
+
+static int
+nvme_fc_create_hw_io_queues(struct nvme_fc_ctrl *ctrl, u16 qsize)
+{
+ struct nvme_fc_queue *queue = &ctrl->queues[1];
+ int i, ret;
+
+ for (i = 1; i < ctrl->ctrl.queue_count; i++, queue++) {
+ ret = __nvme_fc_create_hw_queue(ctrl, queue, i, qsize);
+ if (ret)
+ goto delete_queues;
+ }
+
+ return 0;
+
+delete_queues:
+ for (; i >= 0; i--)
+ __nvme_fc_delete_hw_queue(ctrl, &ctrl->queues[i], i);
+ return ret;
+}
+
+static int
+nvme_fc_connect_io_queues(struct nvme_fc_ctrl *ctrl, u16 qsize)
+{
+ int i, ret = 0;
+
+ for (i = 1; i < ctrl->ctrl.queue_count; i++) {
+ ret = nvme_fc_connect_queue(ctrl, &ctrl->queues[i], qsize,
+ (qsize / 5));
+ if (ret)
+ break;
+ ret = nvmf_connect_io_queue(&ctrl->ctrl, i);
+ if (ret)
+ break;
+
+ set_bit(NVME_FC_Q_LIVE, &ctrl->queues[i].flags);
+ }
+
+ return ret;
+}
+
+static void
+nvme_fc_init_io_queues(struct nvme_fc_ctrl *ctrl)
+{
+ int i;
+
+ for (i = 1; i < ctrl->ctrl.queue_count; i++)
+ nvme_fc_init_queue(ctrl, i, ctrl->ctrl.sqsize);
+}
+
+static void
+nvme_fc_ctrl_free(struct kref *ref)
+{
+ struct nvme_fc_ctrl *ctrl =
+ container_of(ref, struct nvme_fc_ctrl, ref);
+ unsigned long flags;
+
+ if (ctrl->ctrl.tagset) {
+ blk_cleanup_queue(ctrl->ctrl.connect_q);
+ blk_mq_free_tag_set(&ctrl->tag_set);
+ }
+
+ /* remove from rport list */
+ spin_lock_irqsave(&ctrl->rport->lock, flags);
+ list_del(&ctrl->ctrl_list);
+ spin_unlock_irqrestore(&ctrl->rport->lock, flags);
+
+ blk_mq_unquiesce_queue(ctrl->ctrl.admin_q);
+ blk_cleanup_queue(ctrl->ctrl.admin_q);
+ blk_mq_free_tag_set(&ctrl->admin_tag_set);
+
+ kfree(ctrl->queues);
+
+ put_device(ctrl->dev);
+ nvme_fc_rport_put(ctrl->rport);
+
+ ida_simple_remove(&nvme_fc_ctrl_cnt, ctrl->cnum);
+ if (ctrl->ctrl.opts)
+ nvmf_free_options(ctrl->ctrl.opts);
+ kfree(ctrl);
+}
+
+static void
+nvme_fc_ctrl_put(struct nvme_fc_ctrl *ctrl)
+{
+ kref_put(&ctrl->ref, nvme_fc_ctrl_free);
+}
+
+static int
+nvme_fc_ctrl_get(struct nvme_fc_ctrl *ctrl)
+{
+ return kref_get_unless_zero(&ctrl->ref);
+}
+
+/*
+ * All accesses from nvme core layer done - can now free the
+ * controller. Called after last nvme_put_ctrl() call
+ */
+static void
+nvme_fc_nvme_ctrl_freed(struct nvme_ctrl *nctrl)
+{
+ struct nvme_fc_ctrl *ctrl = to_fc_ctrl(nctrl);
+
+ WARN_ON(nctrl != &ctrl->ctrl);
+
+ nvme_fc_ctrl_put(ctrl);
+}
+
+static void
+nvme_fc_error_recovery(struct nvme_fc_ctrl *ctrl, char *errmsg)
+{
+ /* only proceed if in LIVE state - e.g. on first error */
+ if (ctrl->ctrl.state != NVME_CTRL_LIVE)
+ return;
+
+ dev_warn(ctrl->ctrl.device,
+ "NVME-FC{%d}: transport association error detected: %s\n",
+ ctrl->cnum, errmsg);
+ dev_warn(ctrl->ctrl.device,
+ "NVME-FC{%d}: resetting controller\n", ctrl->cnum);
+
+ if (!nvme_change_ctrl_state(&ctrl->ctrl, NVME_CTRL_RECONNECTING)) {
+ dev_err(ctrl->ctrl.device,
+ "NVME-FC{%d}: error_recovery: Couldn't change state "
+ "to RECONNECTING\n", ctrl->cnum);
+ return;
+ }
+
+ nvme_reset_ctrl(&ctrl->ctrl);
+}
+
+static enum blk_eh_timer_return
+nvme_fc_timeout(struct request *rq, bool reserved)
+{
+ struct nvme_fc_fcp_op *op = blk_mq_rq_to_pdu(rq);
+ struct nvme_fc_ctrl *ctrl = op->ctrl;
+ int ret;
+
+ if (reserved)
+ return BLK_EH_RESET_TIMER;
+
+ ret = __nvme_fc_abort_op(ctrl, op);
+ if (ret)
+ /* io wasn't active to abort consider it done */
+ return BLK_EH_HANDLED;
+
+ /*
+ * we can't individually ABTS an io without affecting the queue,
+ * thus killing the queue, adn thus the association.
+ * So resolve by performing a controller reset, which will stop
+ * the host/io stack, terminate the association on the link,
+ * and recreate an association on the link.
+ */
+ nvme_fc_error_recovery(ctrl, "io timeout error");
+
+ return BLK_EH_HANDLED;
+}
+
+static int
+nvme_fc_map_data(struct nvme_fc_ctrl *ctrl, struct request *rq,
+ struct nvme_fc_fcp_op *op)
+{
+ struct nvmefc_fcp_req *freq = &op->fcp_req;
+ enum dma_data_direction dir;
+ int ret;
+
+ freq->sg_cnt = 0;
+
+ if (!blk_rq_payload_bytes(rq))
+ return 0;
+
+ freq->sg_table.sgl = freq->first_sgl;
+ ret = sg_alloc_table_chained(&freq->sg_table,
+ blk_rq_nr_phys_segments(rq), freq->sg_table.sgl);
+ if (ret)
+ return -ENOMEM;
+
+ op->nents = blk_rq_map_sg(rq->q, rq, freq->sg_table.sgl);
+ WARN_ON(op->nents > blk_rq_nr_phys_segments(rq));
+ dir = (rq_data_dir(rq) == WRITE) ? DMA_TO_DEVICE : DMA_FROM_DEVICE;
+ freq->sg_cnt = fc_dma_map_sg(ctrl->lport->dev, freq->sg_table.sgl,
+ op->nents, dir);
+ if (unlikely(freq->sg_cnt <= 0)) {
+ sg_free_table_chained(&freq->sg_table, true);
+ freq->sg_cnt = 0;
+ return -EFAULT;
+ }
+
+ /*
+ * TODO: blk_integrity_rq(rq) for DIF
+ */
+ return 0;
+}
+
+static void
+nvme_fc_unmap_data(struct nvme_fc_ctrl *ctrl, struct request *rq,
+ struct nvme_fc_fcp_op *op)
+{
+ struct nvmefc_fcp_req *freq = &op->fcp_req;
+
+ if (!freq->sg_cnt)
+ return;
+
+ fc_dma_unmap_sg(ctrl->lport->dev, freq->sg_table.sgl, op->nents,
+ ((rq_data_dir(rq) == WRITE) ?
+ DMA_TO_DEVICE : DMA_FROM_DEVICE));
+
+ nvme_cleanup_cmd(rq);
+
+ sg_free_table_chained(&freq->sg_table, true);
+
+ freq->sg_cnt = 0;
+}
+
+/*
+ * In FC, the queue is a logical thing. At transport connect, the target
+ * creates its "queue" and returns a handle that is to be given to the
+ * target whenever it posts something to the corresponding SQ. When an
+ * SQE is sent on a SQ, FC effectively considers the SQE, or rather the
+ * command contained within the SQE, an io, and assigns a FC exchange
+ * to it. The SQE and the associated SQ handle are sent in the initial
+ * CMD IU sents on the exchange. All transfers relative to the io occur
+ * as part of the exchange. The CQE is the last thing for the io,
+ * which is transferred (explicitly or implicitly) with the RSP IU
+ * sent on the exchange. After the CQE is received, the FC exchange is
+ * terminaed and the Exchange may be used on a different io.
+ *
+ * The transport to LLDD api has the transport making a request for a
+ * new fcp io request to the LLDD. The LLDD then allocates a FC exchange
+ * resource and transfers the command. The LLDD will then process all
+ * steps to complete the io. Upon completion, the transport done routine
+ * is called.
+ *
+ * So - while the operation is outstanding to the LLDD, there is a link
+ * level FC exchange resource that is also outstanding. This must be
+ * considered in all cleanup operations.
+ */
+static blk_status_t
+nvme_fc_start_fcp_op(struct nvme_fc_ctrl *ctrl, struct nvme_fc_queue *queue,
+ struct nvme_fc_fcp_op *op, u32 data_len,
+ enum nvmefc_fcp_datadir io_dir)
+{
+ struct nvme_fc_cmd_iu *cmdiu = &op->cmd_iu;
+ struct nvme_command *sqe = &cmdiu->sqe;
+ u32 csn;
+ int ret;
+
+ /*
+ * before attempting to send the io, check to see if we believe
+ * the target device is present
+ */
+ if (ctrl->rport->remoteport.port_state != FC_OBJSTATE_ONLINE)
+ goto busy;
+
+ if (!nvme_fc_ctrl_get(ctrl))
+ return BLK_STS_IOERR;
+
+ /* format the FC-NVME CMD IU and fcp_req */
+ cmdiu->connection_id = cpu_to_be64(queue->connection_id);
+ csn = atomic_inc_return(&queue->csn);
+ cmdiu->csn = cpu_to_be32(csn);
+ cmdiu->data_len = cpu_to_be32(data_len);
+ switch (io_dir) {
+ case NVMEFC_FCP_WRITE:
+ cmdiu->flags = FCNVME_CMD_FLAGS_WRITE;
+ break;
+ case NVMEFC_FCP_READ:
+ cmdiu->flags = FCNVME_CMD_FLAGS_READ;
+ break;
+ case NVMEFC_FCP_NODATA:
+ cmdiu->flags = 0;
+ break;
+ }
+ op->fcp_req.payload_length = data_len;
+ op->fcp_req.io_dir = io_dir;
+ op->fcp_req.transferred_length = 0;
+ op->fcp_req.rcv_rsplen = 0;
+ op->fcp_req.status = NVME_SC_SUCCESS;
+ op->fcp_req.sqid = cpu_to_le16(queue->qnum);
+
+ /*
+ * validate per fabric rules, set fields mandated by fabric spec
+ * as well as those by FC-NVME spec.
+ */
+ WARN_ON_ONCE(sqe->common.metadata);
+ sqe->common.flags |= NVME_CMD_SGL_METABUF;
+
+ /*
+ * format SQE DPTR field per FC-NVME rules:
+ * type=0x5 Transport SGL Data Block Descriptor
+ * subtype=0xA Transport-specific value
+ * address=0
+ * length=length of the data series
+ */
+ sqe->rw.dptr.sgl.type = (NVME_TRANSPORT_SGL_DATA_DESC << 4) |
+ NVME_SGL_FMT_TRANSPORT_A;
+ sqe->rw.dptr.sgl.length = cpu_to_le32(data_len);
+ sqe->rw.dptr.sgl.addr = 0;
+
+ if (!(op->flags & FCOP_FLAGS_AEN)) {
+ ret = nvme_fc_map_data(ctrl, op->rq, op);
+ if (ret < 0) {
+ nvme_cleanup_cmd(op->rq);
+ nvme_fc_ctrl_put(ctrl);
+ if (ret == -ENOMEM || ret == -EAGAIN)
+ return BLK_STS_RESOURCE;
+ return BLK_STS_IOERR;
+ }
+ }
+
+ fc_dma_sync_single_for_device(ctrl->lport->dev, op->fcp_req.cmddma,
+ sizeof(op->cmd_iu), DMA_TO_DEVICE);
+
+ atomic_set(&op->state, FCPOP_STATE_ACTIVE);
+
+ if (!(op->flags & FCOP_FLAGS_AEN))
+ blk_mq_start_request(op->rq);
+
+ ret = ctrl->lport->ops->fcp_io(&ctrl->lport->localport,
+ &ctrl->rport->remoteport,
+ queue->lldd_handle, &op->fcp_req);
+
+ if (ret) {
+ if (!(op->flags & FCOP_FLAGS_AEN))
+ nvme_fc_unmap_data(ctrl, op->rq, op);
+
+ nvme_fc_ctrl_put(ctrl);
+
+ if (ctrl->rport->remoteport.port_state == FC_OBJSTATE_ONLINE &&
+ ret != -EBUSY)
+ return BLK_STS_IOERR;
+
+ goto busy;
+ }
+
+ return BLK_STS_OK;
+
+busy:
+ if (!(op->flags & FCOP_FLAGS_AEN) && queue->hctx)
+ blk_mq_delay_run_hw_queue(queue->hctx, NVMEFC_QUEUE_DELAY);
+
+ return BLK_STS_RESOURCE;
+}
+
+static inline blk_status_t nvme_fc_is_ready(struct nvme_fc_queue *queue,
+ struct request *rq)
+{
+ if (unlikely(!test_bit(NVME_FC_Q_LIVE, &queue->flags)))
+ return nvmf_check_init_req(&queue->ctrl->ctrl, rq);
+ return BLK_STS_OK;
+}
+
+static blk_status_t
+nvme_fc_queue_rq(struct blk_mq_hw_ctx *hctx,
+ const struct blk_mq_queue_data *bd)
+{
+ struct nvme_ns *ns = hctx->queue->queuedata;
+ struct nvme_fc_queue *queue = hctx->driver_data;
+ struct nvme_fc_ctrl *ctrl = queue->ctrl;
+ struct request *rq = bd->rq;
+ struct nvme_fc_fcp_op *op = blk_mq_rq_to_pdu(rq);
+ struct nvme_fc_cmd_iu *cmdiu = &op->cmd_iu;
+ struct nvme_command *sqe = &cmdiu->sqe;
+ enum nvmefc_fcp_datadir io_dir;
+ u32 data_len;
+ blk_status_t ret;
+
+ ret = nvme_fc_is_ready(queue, rq);
+ if (unlikely(ret))
+ return ret;
+
+ ret = nvme_setup_cmd(ns, rq, sqe);
+ if (ret)
+ return ret;
+
+ data_len = blk_rq_payload_bytes(rq);
+ if (data_len)
+ io_dir = ((rq_data_dir(rq) == WRITE) ?
+ NVMEFC_FCP_WRITE : NVMEFC_FCP_READ);
+ else
+ io_dir = NVMEFC_FCP_NODATA;
+
+ return nvme_fc_start_fcp_op(ctrl, queue, op, data_len, io_dir);
+}
+
+static struct blk_mq_tags *
+nvme_fc_tagset(struct nvme_fc_queue *queue)
+{
+ if (queue->qnum == 0)
+ return queue->ctrl->admin_tag_set.tags[queue->qnum];
+
+ return queue->ctrl->tag_set.tags[queue->qnum - 1];
+}
+
+static int
+nvme_fc_poll(struct blk_mq_hw_ctx *hctx, unsigned int tag)
+
+{
+ struct nvme_fc_queue *queue = hctx->driver_data;
+ struct nvme_fc_ctrl *ctrl = queue->ctrl;
+ struct request *req;
+ struct nvme_fc_fcp_op *op;
+
+ req = blk_mq_tag_to_rq(nvme_fc_tagset(queue), tag);
+ if (!req)
+ return 0;
+
+ op = blk_mq_rq_to_pdu(req);
+
+ if ((atomic_read(&op->state) == FCPOP_STATE_ACTIVE) &&
+ (ctrl->lport->ops->poll_queue))
+ ctrl->lport->ops->poll_queue(&ctrl->lport->localport,
+ queue->lldd_handle);
+
+ return ((atomic_read(&op->state) != FCPOP_STATE_ACTIVE));
+}
+
+static void
+nvme_fc_submit_async_event(struct nvme_ctrl *arg, int aer_idx)
+{
+ struct nvme_fc_ctrl *ctrl = to_fc_ctrl(arg);
+ struct nvme_fc_fcp_op *aen_op;
+ unsigned long flags;
+ bool terminating = false;
+ blk_status_t ret;
+
+ if (aer_idx > NVME_FC_NR_AEN_COMMANDS)
+ return;
+
+ spin_lock_irqsave(&ctrl->lock, flags);
+ if (ctrl->flags & FCCTRL_TERMIO)
+ terminating = true;
+ spin_unlock_irqrestore(&ctrl->lock, flags);
+
+ if (terminating)
+ return;
+
+ aen_op = &ctrl->aen_ops[aer_idx];
+
+ ret = nvme_fc_start_fcp_op(ctrl, aen_op->queue, aen_op, 0,
+ NVMEFC_FCP_NODATA);
+ if (ret)
+ dev_err(ctrl->ctrl.device,
+ "failed async event work [%d]\n", aer_idx);
+}
+
+static void
+__nvme_fc_final_op_cleanup(struct request *rq)
+{
+ struct nvme_fc_fcp_op *op = blk_mq_rq_to_pdu(rq);
+ struct nvme_fc_ctrl *ctrl = op->ctrl;
+
+ atomic_set(&op->state, FCPOP_STATE_IDLE);
+ op->flags &= ~(FCOP_FLAGS_TERMIO | FCOP_FLAGS_RELEASED |
+ FCOP_FLAGS_COMPLETE);
+
+ nvme_fc_unmap_data(ctrl, rq, op);
+ nvme_complete_rq(rq);
+ nvme_fc_ctrl_put(ctrl);
+
+}
+
+static void
+nvme_fc_complete_rq(struct request *rq)
+{
+ struct nvme_fc_fcp_op *op = blk_mq_rq_to_pdu(rq);
+ struct nvme_fc_ctrl *ctrl = op->ctrl;
+ unsigned long flags;
+ bool completed = false;
+
+ /*
+ * the core layer, on controller resets after calling
+ * nvme_shutdown_ctrl(), calls complete_rq without our
+ * calling blk_mq_complete_request(), thus there may still
+ * be live i/o outstanding with the LLDD. Means transport has
+ * to track complete calls vs fcpio_done calls to know what
+ * path to take on completes and dones.
+ */
+ spin_lock_irqsave(&ctrl->lock, flags);
+ if (op->flags & FCOP_FLAGS_COMPLETE)
+ completed = true;
+ else
+ op->flags |= FCOP_FLAGS_RELEASED;
+ spin_unlock_irqrestore(&ctrl->lock, flags);
+
+ if (completed)
+ __nvme_fc_final_op_cleanup(rq);
+}
+
+/*
+ * This routine is used by the transport when it needs to find active
+ * io on a queue that is to be terminated. The transport uses
+ * blk_mq_tagset_busy_itr() to find the busy requests, which then invoke
+ * this routine to kill them on a 1 by 1 basis.
+ *
+ * As FC allocates FC exchange for each io, the transport must contact
+ * the LLDD to terminate the exchange, thus releasing the FC exchange.
+ * After terminating the exchange the LLDD will call the transport's
+ * normal io done path for the request, but it will have an aborted
+ * status. The done path will return the io request back to the block
+ * layer with an error status.
+ */
+static void
+nvme_fc_terminate_exchange(struct request *req, void *data, bool reserved)
+{
+ struct nvme_ctrl *nctrl = data;
+ struct nvme_fc_ctrl *ctrl = to_fc_ctrl(nctrl);
+ struct nvme_fc_fcp_op *op = blk_mq_rq_to_pdu(req);
+ unsigned long flags;
+ int status;
+
+ if (!blk_mq_request_started(req))
+ return;
+
+ spin_lock_irqsave(&ctrl->lock, flags);
+ if (ctrl->flags & FCCTRL_TERMIO) {
+ ctrl->iocnt++;
+ op->flags |= FCOP_FLAGS_TERMIO;
+ }
+ spin_unlock_irqrestore(&ctrl->lock, flags);
+
+ status = __nvme_fc_abort_op(ctrl, op);
+ if (status) {
+ /*
+ * if __nvme_fc_abort_op failed the io wasn't
+ * active. Thus this call path is running in
+ * parallel to the io complete. Treat as non-error.
+ */
+
+ /* back out the flags/counters */
+ spin_lock_irqsave(&ctrl->lock, flags);
+ if (ctrl->flags & FCCTRL_TERMIO)
+ ctrl->iocnt--;
+ op->flags &= ~FCOP_FLAGS_TERMIO;
+ spin_unlock_irqrestore(&ctrl->lock, flags);
+ return;
+ }
+}
+
+
+static const struct blk_mq_ops nvme_fc_mq_ops = {
+ .queue_rq = nvme_fc_queue_rq,
+ .complete = nvme_fc_complete_rq,
+ .init_request = nvme_fc_init_request,
+ .exit_request = nvme_fc_exit_request,
+ .init_hctx = nvme_fc_init_hctx,
+ .poll = nvme_fc_poll,
+ .timeout = nvme_fc_timeout,
+};
+
+static int
+nvme_fc_create_io_queues(struct nvme_fc_ctrl *ctrl)
+{
+ struct nvmf_ctrl_options *opts = ctrl->ctrl.opts;
+ unsigned int nr_io_queues;
+ int ret;
+
+ nr_io_queues = min(min(opts->nr_io_queues, num_online_cpus()),
+ ctrl->lport->ops->max_hw_queues);
+ ret = nvme_set_queue_count(&ctrl->ctrl, &nr_io_queues);
+ if (ret) {
+ dev_info(ctrl->ctrl.device,
+ "set_queue_count failed: %d\n", ret);
+ return ret;
+ }
+
+ ctrl->ctrl.queue_count = nr_io_queues + 1;
+ if (!nr_io_queues)
+ return 0;
+
+ nvme_fc_init_io_queues(ctrl);
+
+ memset(&ctrl->tag_set, 0, sizeof(ctrl->tag_set));
+ ctrl->tag_set.ops = &nvme_fc_mq_ops;
+ ctrl->tag_set.queue_depth = ctrl->ctrl.opts->queue_size;
+ ctrl->tag_set.reserved_tags = 1; /* fabric connect */
+ ctrl->tag_set.numa_node = NUMA_NO_NODE;
+ ctrl->tag_set.flags = BLK_MQ_F_SHOULD_MERGE;
+ ctrl->tag_set.cmd_size = sizeof(struct nvme_fc_fcp_op) +
+ (SG_CHUNK_SIZE *
+ sizeof(struct scatterlist)) +
+ ctrl->lport->ops->fcprqst_priv_sz;
+ ctrl->tag_set.driver_data = ctrl;
+ ctrl->tag_set.nr_hw_queues = ctrl->ctrl.queue_count - 1;
+ ctrl->tag_set.timeout = NVME_IO_TIMEOUT;
+
+ ret = blk_mq_alloc_tag_set(&ctrl->tag_set);
+ if (ret)
+ return ret;
+
+ ctrl->ctrl.tagset = &ctrl->tag_set;
+
+ ctrl->ctrl.connect_q = blk_mq_init_queue(&ctrl->tag_set);
+ if (IS_ERR(ctrl->ctrl.connect_q)) {
+ ret = PTR_ERR(ctrl->ctrl.connect_q);
+ goto out_free_tag_set;
+ }
+
+ ret = nvme_fc_create_hw_io_queues(ctrl, ctrl->ctrl.opts->queue_size);
+ if (ret)
+ goto out_cleanup_blk_queue;
+
+ ret = nvme_fc_connect_io_queues(ctrl, ctrl->ctrl.opts->queue_size);
+ if (ret)
+ goto out_delete_hw_queues;
+
+ return 0;
+
+out_delete_hw_queues:
+ nvme_fc_delete_hw_io_queues(ctrl);
+out_cleanup_blk_queue:
+ blk_cleanup_queue(ctrl->ctrl.connect_q);
+out_free_tag_set:
+ blk_mq_free_tag_set(&ctrl->tag_set);
+ nvme_fc_free_io_queues(ctrl);
+
+ /* force put free routine to ignore io queues */
+ ctrl->ctrl.tagset = NULL;
+
+ return ret;
+}
+
+static int
+nvme_fc_reinit_io_queues(struct nvme_fc_ctrl *ctrl)
+{
+ struct nvmf_ctrl_options *opts = ctrl->ctrl.opts;
+ unsigned int nr_io_queues;
+ int ret;
+
+ nr_io_queues = min(min(opts->nr_io_queues, num_online_cpus()),
+ ctrl->lport->ops->max_hw_queues);
+ ret = nvme_set_queue_count(&ctrl->ctrl, &nr_io_queues);
+ if (ret) {
+ dev_info(ctrl->ctrl.device,
+ "set_queue_count failed: %d\n", ret);
+ return ret;
+ }
+
+ ctrl->ctrl.queue_count = nr_io_queues + 1;
+ /* check for io queues existing */
+ if (ctrl->ctrl.queue_count == 1)
+ return 0;
+
+ nvme_fc_init_io_queues(ctrl);
+
+ ret = blk_mq_reinit_tagset(&ctrl->tag_set, nvme_fc_reinit_request);
+ if (ret)
+ goto out_free_io_queues;
+
+ ret = nvme_fc_create_hw_io_queues(ctrl, ctrl->ctrl.opts->queue_size);
+ if (ret)
+ goto out_free_io_queues;
+
+ ret = nvme_fc_connect_io_queues(ctrl, ctrl->ctrl.opts->queue_size);
+ if (ret)
+ goto out_delete_hw_queues;
+
+ blk_mq_update_nr_hw_queues(&ctrl->tag_set, nr_io_queues);
+
+ return 0;
+
+out_delete_hw_queues:
+ nvme_fc_delete_hw_io_queues(ctrl);
+out_free_io_queues:
+ nvme_fc_free_io_queues(ctrl);
+ return ret;
+}
+
+/*
+ * This routine restarts the controller on the host side, and
+ * on the link side, recreates the controller association.
+ */
+static int
+nvme_fc_create_association(struct nvme_fc_ctrl *ctrl)
+{
+ struct nvmf_ctrl_options *opts = ctrl->ctrl.opts;
+ u32 segs;
+ int ret;
+ bool changed;
+
+ ++ctrl->ctrl.nr_reconnects;
+
+ /*
+ * Create the admin queue
+ */
+
+ nvme_fc_init_queue(ctrl, 0, NVME_FC_AQ_BLKMQ_DEPTH);
+
+ ret = __nvme_fc_create_hw_queue(ctrl, &ctrl->queues[0], 0,
+ NVME_FC_AQ_BLKMQ_DEPTH);
+ if (ret)
+ goto out_free_queue;
+
+ ret = nvme_fc_connect_admin_queue(ctrl, &ctrl->queues[0],
+ NVME_FC_AQ_BLKMQ_DEPTH,
+ (NVME_FC_AQ_BLKMQ_DEPTH / 4));
+ if (ret)
+ goto out_delete_hw_queue;
+
+ if (ctrl->ctrl.state != NVME_CTRL_NEW)
+ blk_mq_unquiesce_queue(ctrl->ctrl.admin_q);
+
+ ret = nvmf_connect_admin_queue(&ctrl->ctrl);
+ if (ret)
+ goto out_disconnect_admin_queue;
+
+ set_bit(NVME_FC_Q_LIVE, &ctrl->queues[0].flags);
+
+ /*
+ * Check controller capabilities
+ *
+ * todo:- add code to check if ctrl attributes changed from
+ * prior connection values
+ */
+
+ ret = nvmf_reg_read64(&ctrl->ctrl, NVME_REG_CAP, &ctrl->ctrl.cap);
+ if (ret) {
+ dev_err(ctrl->ctrl.device,
+ "prop_get NVME_REG_CAP failed\n");
+ goto out_disconnect_admin_queue;
+ }
+
+ ctrl->ctrl.sqsize =
+ min_t(int, NVME_CAP_MQES(ctrl->ctrl.cap) + 1, ctrl->ctrl.sqsize);
+
+ ret = nvme_enable_ctrl(&ctrl->ctrl, ctrl->ctrl.cap);
+ if (ret)
+ goto out_disconnect_admin_queue;
+
+ segs = min_t(u32, NVME_FC_MAX_SEGMENTS,
+ ctrl->lport->ops->max_sgl_segments);
+ ctrl->ctrl.max_hw_sectors = (segs - 1) << (PAGE_SHIFT - 9);
+
+ ret = nvme_init_identify(&ctrl->ctrl);
+ if (ret)
+ goto out_disconnect_admin_queue;
+
+ /* sanity checks */
+
+ /* FC-NVME does not have other data in the capsule */
+ if (ctrl->ctrl.icdoff) {
+ dev_err(ctrl->ctrl.device, "icdoff %d is not supported!\n",
+ ctrl->ctrl.icdoff);
+ goto out_disconnect_admin_queue;
+ }
+
+ /* FC-NVME supports normal SGL Data Block Descriptors */
+
+ if (opts->queue_size > ctrl->ctrl.maxcmd) {
+ /* warn if maxcmd is lower than queue_size */
+ dev_warn(ctrl->ctrl.device,
+ "queue_size %zu > ctrl maxcmd %u, reducing "
+ "to queue_size\n",
+ opts->queue_size, ctrl->ctrl.maxcmd);
+ opts->queue_size = ctrl->ctrl.maxcmd;
+ }
+
+ ret = nvme_fc_init_aen_ops(ctrl);
+ if (ret)
+ goto out_term_aen_ops;
+
+ /*
+ * Create the io queues
+ */
+
+ if (ctrl->ctrl.queue_count > 1) {
+ if (ctrl->ctrl.state == NVME_CTRL_NEW)
+ ret = nvme_fc_create_io_queues(ctrl);
+ else
+ ret = nvme_fc_reinit_io_queues(ctrl);
+ if (ret)
+ goto out_term_aen_ops;
+ }
+
+ changed = nvme_change_ctrl_state(&ctrl->ctrl, NVME_CTRL_LIVE);
+ WARN_ON_ONCE(!changed);
+
+ ctrl->ctrl.nr_reconnects = 0;
+
+ nvme_start_ctrl(&ctrl->ctrl);
+
+ return 0; /* Success */
+
+out_term_aen_ops:
+ nvme_fc_term_aen_ops(ctrl);
+out_disconnect_admin_queue:
+ /* send a Disconnect(association) LS to fc-nvme target */
+ nvme_fc_xmt_disconnect_assoc(ctrl);
+out_delete_hw_queue:
+ __nvme_fc_delete_hw_queue(ctrl, &ctrl->queues[0], 0);
+out_free_queue:
+ nvme_fc_free_queue(&ctrl->queues[0]);
+
+ return ret;
+}
+
+/*
+ * This routine stops operation of the controller on the host side.
+ * On the host os stack side: Admin and IO queues are stopped,
+ * outstanding ios on them terminated via FC ABTS.
+ * On the link side: the association is terminated.
+ */
+static void
+nvme_fc_delete_association(struct nvme_fc_ctrl *ctrl)
+{
+ unsigned long flags;
+
+ spin_lock_irqsave(&ctrl->lock, flags);
+ ctrl->flags |= FCCTRL_TERMIO;
+ ctrl->iocnt = 0;
+ spin_unlock_irqrestore(&ctrl->lock, flags);
+
+ /*
+ * If io queues are present, stop them and terminate all outstanding
+ * ios on them. As FC allocates FC exchange for each io, the
+ * transport must contact the LLDD to terminate the exchange,
+ * thus releasing the FC exchange. We use blk_mq_tagset_busy_itr()
+ * to tell us what io's are busy and invoke a transport routine
+ * to kill them with the LLDD. After terminating the exchange
+ * the LLDD will call the transport's normal io done path, but it
+ * will have an aborted status. The done path will return the
+ * io requests back to the block layer as part of normal completions
+ * (but with error status).
+ */
+ if (ctrl->ctrl.queue_count > 1) {
+ nvme_stop_queues(&ctrl->ctrl);
+ blk_mq_tagset_busy_iter(&ctrl->tag_set,
+ nvme_fc_terminate_exchange, &ctrl->ctrl);
+ }
+
+ /*
+ * Other transports, which don't have link-level contexts bound
+ * to sqe's, would try to gracefully shutdown the controller by
+ * writing the registers for shutdown and polling (call
+ * nvme_shutdown_ctrl()). Given a bunch of i/o was potentially
+ * just aborted and we will wait on those contexts, and given
+ * there was no indication of how live the controlelr is on the
+ * link, don't send more io to create more contexts for the
+ * shutdown. Let the controller fail via keepalive failure if
+ * its still present.
+ */
+
+ /*
+ * clean up the admin queue. Same thing as above.
+ * use blk_mq_tagset_busy_itr() and the transport routine to
+ * terminate the exchanges.
+ */
+ blk_mq_quiesce_queue(ctrl->ctrl.admin_q);
+ blk_mq_tagset_busy_iter(&ctrl->admin_tag_set,
+ nvme_fc_terminate_exchange, &ctrl->ctrl);
+
+ /* kill the aens as they are a separate path */
+ nvme_fc_abort_aen_ops(ctrl);
+
+ /* wait for all io that had to be aborted */
+ spin_lock_irq(&ctrl->lock);
+ wait_event_lock_irq(ctrl->ioabort_wait, ctrl->iocnt == 0, ctrl->lock);
+ ctrl->flags &= ~FCCTRL_TERMIO;
+ spin_unlock_irq(&ctrl->lock);
+
+ nvme_fc_term_aen_ops(ctrl);
+
+ /*
+ * send a Disconnect(association) LS to fc-nvme target
+ * Note: could have been sent at top of process, but
+ * cleaner on link traffic if after the aborts complete.
+ * Note: if association doesn't exist, association_id will be 0
+ */
+ if (ctrl->association_id)
+ nvme_fc_xmt_disconnect_assoc(ctrl);
+
+ if (ctrl->ctrl.tagset) {
+ nvme_fc_delete_hw_io_queues(ctrl);
+ nvme_fc_free_io_queues(ctrl);
+ }
+
+ __nvme_fc_delete_hw_queue(ctrl, &ctrl->queues[0], 0);
+ nvme_fc_free_queue(&ctrl->queues[0]);
+}
+
+static void
+nvme_fc_delete_ctrl_work(struct work_struct *work)
+{
+ struct nvme_fc_ctrl *ctrl =
+ container_of(work, struct nvme_fc_ctrl, delete_work);
+
+ cancel_work_sync(&ctrl->ctrl.reset_work);
+ cancel_delayed_work_sync(&ctrl->connect_work);
+ nvme_stop_ctrl(&ctrl->ctrl);
+ nvme_remove_namespaces(&ctrl->ctrl);
+ /*
+ * kill the association on the link side. this will block
+ * waiting for io to terminate
+ */
+ nvme_fc_delete_association(ctrl);
+
+ /*
+ * tear down the controller
+ * After the last reference on the nvme ctrl is removed,
+ * the transport nvme_fc_nvme_ctrl_freed() callback will be
+ * invoked. From there, the transport will tear down it's
+ * logical queues and association.
+ */
+ nvme_uninit_ctrl(&ctrl->ctrl);
+
+ nvme_put_ctrl(&ctrl->ctrl);
+}
+
+static bool
+__nvme_fc_schedule_delete_work(struct nvme_fc_ctrl *ctrl)
+{
+ if (!nvme_change_ctrl_state(&ctrl->ctrl, NVME_CTRL_DELETING))
+ return true;
+
+ if (!queue_work(nvme_wq, &ctrl->delete_work))
+ return true;
+
+ return false;
+}
+
+static int
+__nvme_fc_del_ctrl(struct nvme_fc_ctrl *ctrl)
+{
+ return __nvme_fc_schedule_delete_work(ctrl) ? -EBUSY : 0;
+}
+
+/*
+ * Request from nvme core layer to delete the controller
+ */
+static int
+nvme_fc_del_nvme_ctrl(struct nvme_ctrl *nctrl)
+{
+ struct nvme_fc_ctrl *ctrl = to_fc_ctrl(nctrl);
+ int ret;
+
+ if (!kref_get_unless_zero(&ctrl->ctrl.kref))
+ return -EBUSY;
+
+ ret = __nvme_fc_del_ctrl(ctrl);
+
+ if (!ret)
+ flush_workqueue(nvme_wq);
+
+ nvme_put_ctrl(&ctrl->ctrl);
+
+ return ret;
+}
+
+static void
+nvme_fc_reconnect_or_delete(struct nvme_fc_ctrl *ctrl, int status)
+{
+ /* If we are resetting/deleting then do nothing */
+ if (ctrl->ctrl.state != NVME_CTRL_RECONNECTING) {
+ WARN_ON_ONCE(ctrl->ctrl.state == NVME_CTRL_NEW ||
+ ctrl->ctrl.state == NVME_CTRL_LIVE);
+ return;
+ }
+
+ dev_info(ctrl->ctrl.device,
+ "NVME-FC{%d}: reset: Reconnect attempt failed (%d)\n",
+ ctrl->cnum, status);
+
+ if (nvmf_should_reconnect(&ctrl->ctrl)) {
+ dev_info(ctrl->ctrl.device,
+ "NVME-FC{%d}: Reconnect attempt in %d seconds.\n",
+ ctrl->cnum, ctrl->ctrl.opts->reconnect_delay);
+ queue_delayed_work(nvme_wq, &ctrl->connect_work,
+ ctrl->ctrl.opts->reconnect_delay * HZ);
+ } else {
+ dev_warn(ctrl->ctrl.device,
+ "NVME-FC{%d}: Max reconnect attempts (%d) "
+ "reached. Removing controller\n",
+ ctrl->cnum, ctrl->ctrl.nr_reconnects);
+ WARN_ON(__nvme_fc_schedule_delete_work(ctrl));
+ }
+}
+
+static void
+nvme_fc_reset_ctrl_work(struct work_struct *work)
+{
+ struct nvme_fc_ctrl *ctrl =
+ container_of(work, struct nvme_fc_ctrl, ctrl.reset_work);
+ int ret;
+
+ nvme_stop_ctrl(&ctrl->ctrl);
+ /* will block will waiting for io to terminate */
+ nvme_fc_delete_association(ctrl);
+
+ ret = nvme_fc_create_association(ctrl);
+ if (ret)
+ nvme_fc_reconnect_or_delete(ctrl, ret);
+ else
+ dev_info(ctrl->ctrl.device,
+ "NVME-FC{%d}: controller reset complete\n", ctrl->cnum);
+}
+
+static const struct nvme_ctrl_ops nvme_fc_ctrl_ops = {
+ .name = "fc",
+ .module = THIS_MODULE,
+ .flags = NVME_F_FABRICS,
+ .reg_read32 = nvmf_reg_read32,
+ .reg_read64 = nvmf_reg_read64,
+ .reg_write32 = nvmf_reg_write32,
+ .free_ctrl = nvme_fc_nvme_ctrl_freed,
+ .submit_async_event = nvme_fc_submit_async_event,
+ .delete_ctrl = nvme_fc_del_nvme_ctrl,
+ .get_address = nvmf_get_address,
+};
+
+static void
+nvme_fc_connect_ctrl_work(struct work_struct *work)
+{
+ int ret;
+
+ struct nvme_fc_ctrl *ctrl =
+ container_of(to_delayed_work(work),
+ struct nvme_fc_ctrl, connect_work);
+
+ ret = nvme_fc_create_association(ctrl);
+ if (ret)
+ nvme_fc_reconnect_or_delete(ctrl, ret);
+ else
+ dev_info(ctrl->ctrl.device,
+ "NVME-FC{%d}: controller reconnect complete\n",
+ ctrl->cnum);
+}
+
+
+static const struct blk_mq_ops nvme_fc_admin_mq_ops = {
+ .queue_rq = nvme_fc_queue_rq,
+ .complete = nvme_fc_complete_rq,
+ .init_request = nvme_fc_init_request,
+ .exit_request = nvme_fc_exit_request,
+ .init_hctx = nvme_fc_init_admin_hctx,
+ .timeout = nvme_fc_timeout,
+};
+
+
+static struct nvme_ctrl *
+nvme_fc_init_ctrl(struct device *dev, struct nvmf_ctrl_options *opts,
+ struct nvme_fc_lport *lport, struct nvme_fc_rport *rport)
+{
+ struct nvme_fc_ctrl *ctrl;
+ unsigned long flags;
+ int ret, idx, retry;
+
+ if (!(rport->remoteport.port_role &
+ (FC_PORT_ROLE_NVME_DISCOVERY | FC_PORT_ROLE_NVME_TARGET))) {
+ ret = -EBADR;
+ goto out_fail;
+ }
+
+ ctrl = kzalloc(sizeof(*ctrl), GFP_KERNEL);
+ if (!ctrl) {
+ ret = -ENOMEM;
+ goto out_fail;
+ }
+
+ idx = ida_simple_get(&nvme_fc_ctrl_cnt, 0, 0, GFP_KERNEL);
+ if (idx < 0) {
+ ret = -ENOSPC;
+ goto out_free_ctrl;
+ }
+
+ ctrl->ctrl.opts = opts;
+ INIT_LIST_HEAD(&ctrl->ctrl_list);
+ ctrl->lport = lport;
+ ctrl->rport = rport;
+ ctrl->dev = lport->dev;
+ ctrl->cnum = idx;
+ init_waitqueue_head(&ctrl->ioabort_wait);
+
+ get_device(ctrl->dev);
+ kref_init(&ctrl->ref);
+
+ INIT_WORK(&ctrl->delete_work, nvme_fc_delete_ctrl_work);
+ INIT_WORK(&ctrl->ctrl.reset_work, nvme_fc_reset_ctrl_work);
+ INIT_DELAYED_WORK(&ctrl->connect_work, nvme_fc_connect_ctrl_work);
+ spin_lock_init(&ctrl->lock);
+
+ /* io queue count */
+ ctrl->ctrl.queue_count = min_t(unsigned int,
+ opts->nr_io_queues,
+ lport->ops->max_hw_queues);
+ ctrl->ctrl.queue_count++; /* +1 for admin queue */
+
+ ctrl->ctrl.sqsize = opts->queue_size - 1;
+ ctrl->ctrl.kato = opts->kato;
+
+ ret = -ENOMEM;
+ ctrl->queues = kcalloc(ctrl->ctrl.queue_count,
+ sizeof(struct nvme_fc_queue), GFP_KERNEL);
+ if (!ctrl->queues)
+ goto out_free_ida;
+
+ memset(&ctrl->admin_tag_set, 0, sizeof(ctrl->admin_tag_set));
+ ctrl->admin_tag_set.ops = &nvme_fc_admin_mq_ops;
+ ctrl->admin_tag_set.queue_depth = NVME_FC_AQ_BLKMQ_DEPTH;
+ ctrl->admin_tag_set.reserved_tags = 2; /* fabric connect + Keep-Alive */
+ ctrl->admin_tag_set.numa_node = NUMA_NO_NODE;
+ ctrl->admin_tag_set.cmd_size = sizeof(struct nvme_fc_fcp_op) +
+ (SG_CHUNK_SIZE *
+ sizeof(struct scatterlist)) +
+ ctrl->lport->ops->fcprqst_priv_sz;
+ ctrl->admin_tag_set.driver_data = ctrl;
+ ctrl->admin_tag_set.nr_hw_queues = 1;
+ ctrl->admin_tag_set.timeout = ADMIN_TIMEOUT;
+
+ ret = blk_mq_alloc_tag_set(&ctrl->admin_tag_set);
+ if (ret)
+ goto out_free_queues;
+ ctrl->ctrl.admin_tagset = &ctrl->admin_tag_set;
+
+ ctrl->ctrl.admin_q = blk_mq_init_queue(&ctrl->admin_tag_set);
+ if (IS_ERR(ctrl->ctrl.admin_q)) {
+ ret = PTR_ERR(ctrl->ctrl.admin_q);
+ goto out_free_admin_tag_set;
+ }
+
+ /*
+ * Would have been nice to init io queues tag set as well.
+ * However, we require interaction from the controller
+ * for max io queue count before we can do so.
+ * Defer this to the connect path.
+ */
+
+ ret = nvme_init_ctrl(&ctrl->ctrl, dev, &nvme_fc_ctrl_ops, 0);
+ if (ret)
+ goto out_cleanup_admin_q;
+
+ /* at this point, teardown path changes to ref counting on nvme ctrl */
+
+ spin_lock_irqsave(&rport->lock, flags);
+ list_add_tail(&ctrl->ctrl_list, &rport->ctrl_list);
+ spin_unlock_irqrestore(&rport->lock, flags);
+
+ /*
+ * It's possible that transactions used to create the association
+ * may fail. Examples: CreateAssociation LS or CreateIOConnection
+ * LS gets dropped/corrupted/fails; or a frame gets dropped or a
+ * command times out for one of the actions to init the controller
+ * (Connect, Get/Set_Property, Set_Features, etc). Many of these
+ * transport errors (frame drop, LS failure) inherently must kill
+ * the association. The transport is coded so that any command used
+ * to create the association (prior to a LIVE state transition
+ * while NEW or RECONNECTING) will fail if it completes in error or
+ * times out.
+ *
+ * As such: as the connect request was mostly likely due to a
+ * udev event that discovered the remote port, meaning there is
+ * not an admin or script there to restart if the connect
+ * request fails, retry the initial connection creation up to
+ * three times before giving up and declaring failure.
+ */
+ for (retry = 0; retry < 3; retry++) {
+ ret = nvme_fc_create_association(ctrl);
+ if (!ret)
+ break;
+ }
+
+ if (ret) {
+ nvme_change_ctrl_state(&ctrl->ctrl, NVME_CTRL_DELETING);
+ cancel_work_sync(&ctrl->ctrl.reset_work);
+ cancel_delayed_work_sync(&ctrl->connect_work);
+
+ /* couldn't schedule retry - fail out */
+ dev_err(ctrl->ctrl.device,
+ "NVME-FC{%d}: Connect retry failed\n", ctrl->cnum);
+
+ ctrl->ctrl.opts = NULL;
+
+ /* initiate nvme ctrl ref counting teardown */
+ nvme_uninit_ctrl(&ctrl->ctrl);
+
+ /* Remove core ctrl ref. */
+ nvme_put_ctrl(&ctrl->ctrl);
+
+ /* as we're past the point where we transition to the ref
+ * counting teardown path, if we return a bad pointer here,
+ * the calling routine, thinking it's prior to the
+ * transition, will do an rport put. Since the teardown
+ * path also does a rport put, we do an extra get here to
+ * so proper order/teardown happens.
+ */
+ nvme_fc_rport_get(rport);
+
+ if (ret > 0)
+ ret = -EIO;
+ return ERR_PTR(ret);
+ }
+
+ kref_get(&ctrl->ctrl.kref);
+
+ dev_info(ctrl->ctrl.device,
+ "NVME-FC{%d}: new ctrl: NQN \"%s\"\n",
+ ctrl->cnum, ctrl->ctrl.opts->subsysnqn);
+
+ return &ctrl->ctrl;
+
+out_cleanup_admin_q:
+ blk_cleanup_queue(ctrl->ctrl.admin_q);
+out_free_admin_tag_set:
+ blk_mq_free_tag_set(&ctrl->admin_tag_set);
+out_free_queues:
+ kfree(ctrl->queues);
+out_free_ida:
+ put_device(ctrl->dev);
+ ida_simple_remove(&nvme_fc_ctrl_cnt, ctrl->cnum);
+out_free_ctrl:
+ kfree(ctrl);
+out_fail:
+ /* exit via here doesn't follow ctlr ref points */
+ return ERR_PTR(ret);
+}
+
+
+struct nvmet_fc_traddr {
+ u64 nn;
+ u64 pn;
+};
+
+static int
+__nvme_fc_parse_u64(substring_t *sstr, u64 *val)
+{
+ u64 token64;
+
+ if (match_u64(sstr, &token64))
+ return -EINVAL;
+ *val = token64;
+
+ return 0;
+}
+
+/*
+ * This routine validates and extracts the WWN's from the TRADDR string.
+ * As kernel parsers need the 0x to determine number base, universally
+ * build string to parse with 0x prefix before parsing name strings.
+ */
+static int
+nvme_fc_parse_traddr(struct nvmet_fc_traddr *traddr, char *buf, size_t blen)
+{
+ char name[2 + NVME_FC_TRADDR_HEXNAMELEN + 1];
+ substring_t wwn = { name, &name[sizeof(name)-1] };
+ int nnoffset, pnoffset;
+
+ /* validate it string one of the 2 allowed formats */
+ if (strnlen(buf, blen) == NVME_FC_TRADDR_MAXLENGTH &&
+ !strncmp(buf, "nn-0x", NVME_FC_TRADDR_OXNNLEN) &&
+ !strncmp(&buf[NVME_FC_TRADDR_MAX_PN_OFFSET],
+ "pn-0x", NVME_FC_TRADDR_OXNNLEN)) {
+ nnoffset = NVME_FC_TRADDR_OXNNLEN;
+ pnoffset = NVME_FC_TRADDR_MAX_PN_OFFSET +
+ NVME_FC_TRADDR_OXNNLEN;
+ } else if ((strnlen(buf, blen) == NVME_FC_TRADDR_MINLENGTH &&
+ !strncmp(buf, "nn-", NVME_FC_TRADDR_NNLEN) &&
+ !strncmp(&buf[NVME_FC_TRADDR_MIN_PN_OFFSET],
+ "pn-", NVME_FC_TRADDR_NNLEN))) {
+ nnoffset = NVME_FC_TRADDR_NNLEN;
+ pnoffset = NVME_FC_TRADDR_MIN_PN_OFFSET + NVME_FC_TRADDR_NNLEN;
+ } else
+ goto out_einval;
+
+ name[0] = '0';
+ name[1] = 'x';
+ name[2 + NVME_FC_TRADDR_HEXNAMELEN] = 0;
+
+ memcpy(&name[2], &buf[nnoffset], NVME_FC_TRADDR_HEXNAMELEN);
+ if (__nvme_fc_parse_u64(&wwn, &traddr->nn))
+ goto out_einval;
+
+ memcpy(&name[2], &buf[pnoffset], NVME_FC_TRADDR_HEXNAMELEN);
+ if (__nvme_fc_parse_u64(&wwn, &traddr->pn))
+ goto out_einval;
+
+ return 0;
+
+out_einval:
+ pr_warn("%s: bad traddr string\n", __func__);
+ return -EINVAL;
+}
+
+static struct nvme_ctrl *
+nvme_fc_create_ctrl(struct device *dev, struct nvmf_ctrl_options *opts)
+{
+ struct nvme_fc_lport *lport;
+ struct nvme_fc_rport *rport;
+ struct nvme_ctrl *ctrl;
+ struct nvmet_fc_traddr laddr = { 0L, 0L };
+ struct nvmet_fc_traddr raddr = { 0L, 0L };
+ unsigned long flags;
+ int ret;
+
+ ret = nvme_fc_parse_traddr(&raddr, opts->traddr, NVMF_TRADDR_SIZE);
+ if (ret || !raddr.nn || !raddr.pn)
+ return ERR_PTR(-EINVAL);
+
+ ret = nvme_fc_parse_traddr(&laddr, opts->host_traddr, NVMF_TRADDR_SIZE);
+ if (ret || !laddr.nn || !laddr.pn)
+ return ERR_PTR(-EINVAL);
+
+ /* find the host and remote ports to connect together */
+ spin_lock_irqsave(&nvme_fc_lock, flags);
+ list_for_each_entry(lport, &nvme_fc_lport_list, port_list) {
+ if (lport->localport.node_name != laddr.nn ||
+ lport->localport.port_name != laddr.pn)
+ continue;
+
+ list_for_each_entry(rport, &lport->endp_list, endp_list) {
+ if (rport->remoteport.node_name != raddr.nn ||
+ rport->remoteport.port_name != raddr.pn)
+ continue;
+
+ /* if fail to get reference fall through. Will error */
+ if (!nvme_fc_rport_get(rport))
+ break;
+
+ spin_unlock_irqrestore(&nvme_fc_lock, flags);
+
+ ctrl = nvme_fc_init_ctrl(dev, opts, lport, rport);
+ if (IS_ERR(ctrl))
+ nvme_fc_rport_put(rport);
+ return ctrl;
+ }
+ }
+ spin_unlock_irqrestore(&nvme_fc_lock, flags);
+
+ return ERR_PTR(-ENOENT);
+}
+
+
+static struct nvmf_transport_ops nvme_fc_transport = {
+ .name = "fc",
+ .required_opts = NVMF_OPT_TRADDR | NVMF_OPT_HOST_TRADDR,
+ .allowed_opts = NVMF_OPT_RECONNECT_DELAY | NVMF_OPT_CTRL_LOSS_TMO,
+ .create_ctrl = nvme_fc_create_ctrl,
+};
+
+static int __init nvme_fc_init_module(void)
+{
+ return nvmf_register_transport(&nvme_fc_transport);
+}
+
+static void __exit nvme_fc_exit_module(void)
+{
+ /* sanity check - all lports should be removed */
+ if (!list_empty(&nvme_fc_lport_list))
+ pr_warn("%s: localport list not empty\n", __func__);
+
+ nvmf_unregister_transport(&nvme_fc_transport);
+
+ ida_destroy(&nvme_fc_local_port_cnt);
+ ida_destroy(&nvme_fc_ctrl_cnt);
+}
+
+module_init(nvme_fc_init_module);
+module_exit(nvme_fc_exit_module);
+
+MODULE_LICENSE("GPL v2");
diff --git a/src/kernel/linux/v4.14/drivers/nvme/host/lightnvm.c b/src/kernel/linux/v4.14/drivers/nvme/host/lightnvm.c
new file mode 100644
index 0000000..1f79e3f
--- /dev/null
+++ b/src/kernel/linux/v4.14/drivers/nvme/host/lightnvm.c
@@ -0,0 +1,957 @@
+/*
+ * nvme-lightnvm.c - LightNVM NVMe device
+ *
+ * Copyright (C) 2014-2015 IT University of Copenhagen
+ * Initial release: Matias Bjorling <mb@lightnvm.io>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License version
+ * 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; see the file COPYING. If not, write to
+ * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139,
+ * USA.
+ *
+ */
+
+#include "nvme.h"
+
+#include <linux/nvme.h>
+#include <linux/bitops.h>
+#include <linux/lightnvm.h>
+#include <linux/vmalloc.h>
+#include <linux/sched/sysctl.h>
+#include <uapi/linux/lightnvm.h>
+
+enum nvme_nvm_admin_opcode {
+ nvme_nvm_admin_identity = 0xe2,
+ nvme_nvm_admin_get_l2p_tbl = 0xea,
+ nvme_nvm_admin_get_bb_tbl = 0xf2,
+ nvme_nvm_admin_set_bb_tbl = 0xf1,
+};
+
+struct nvme_nvm_hb_rw {
+ __u8 opcode;
+ __u8 flags;
+ __u16 command_id;
+ __le32 nsid;
+ __u64 rsvd2;
+ __le64 metadata;
+ __le64 prp1;
+ __le64 prp2;
+ __le64 spba;
+ __le16 length;
+ __le16 control;
+ __le32 dsmgmt;
+ __le64 slba;
+};
+
+struct nvme_nvm_ph_rw {
+ __u8 opcode;
+ __u8 flags;
+ __u16 command_id;
+ __le32 nsid;
+ __u64 rsvd2;
+ __le64 metadata;
+ __le64 prp1;
+ __le64 prp2;
+ __le64 spba;
+ __le16 length;
+ __le16 control;
+ __le32 dsmgmt;
+ __le64 resv;
+};
+
+struct nvme_nvm_identity {
+ __u8 opcode;
+ __u8 flags;
+ __u16 command_id;
+ __le32 nsid;
+ __u64 rsvd[2];
+ __le64 prp1;
+ __le64 prp2;
+ __le32 chnl_off;
+ __u32 rsvd11[5];
+};
+
+struct nvme_nvm_l2ptbl {
+ __u8 opcode;
+ __u8 flags;
+ __u16 command_id;
+ __le32 nsid;
+ __le32 cdw2[4];
+ __le64 prp1;
+ __le64 prp2;
+ __le64 slba;
+ __le32 nlb;
+ __le16 cdw14[6];
+};
+
+struct nvme_nvm_getbbtbl {
+ __u8 opcode;
+ __u8 flags;
+ __u16 command_id;
+ __le32 nsid;
+ __u64 rsvd[2];
+ __le64 prp1;
+ __le64 prp2;
+ __le64 spba;
+ __u32 rsvd4[4];
+};
+
+struct nvme_nvm_setbbtbl {
+ __u8 opcode;
+ __u8 flags;
+ __u16 command_id;
+ __le32 nsid;
+ __le64 rsvd[2];
+ __le64 prp1;
+ __le64 prp2;
+ __le64 spba;
+ __le16 nlb;
+ __u8 value;
+ __u8 rsvd3;
+ __u32 rsvd4[3];
+};
+
+struct nvme_nvm_erase_blk {
+ __u8 opcode;
+ __u8 flags;
+ __u16 command_id;
+ __le32 nsid;
+ __u64 rsvd[2];
+ __le64 prp1;
+ __le64 prp2;
+ __le64 spba;
+ __le16 length;
+ __le16 control;
+ __le32 dsmgmt;
+ __le64 resv;
+};
+
+struct nvme_nvm_command {
+ union {
+ struct nvme_common_command common;
+ struct nvme_nvm_identity identity;
+ struct nvme_nvm_hb_rw hb_rw;
+ struct nvme_nvm_ph_rw ph_rw;
+ struct nvme_nvm_l2ptbl l2p;
+ struct nvme_nvm_getbbtbl get_bb;
+ struct nvme_nvm_setbbtbl set_bb;
+ struct nvme_nvm_erase_blk erase;
+ };
+};
+
+#define NVME_NVM_LP_MLC_PAIRS 886
+struct nvme_nvm_lp_mlc {
+ __le16 num_pairs;
+ __u8 pairs[NVME_NVM_LP_MLC_PAIRS];
+};
+
+struct nvme_nvm_lp_tbl {
+ __u8 id[8];
+ struct nvme_nvm_lp_mlc mlc;
+};
+
+struct nvme_nvm_id_group {
+ __u8 mtype;
+ __u8 fmtype;
+ __le16 res16;
+ __u8 num_ch;
+ __u8 num_lun;
+ __u8 num_pln;
+ __u8 rsvd1;
+ __le16 num_blk;
+ __le16 num_pg;
+ __le16 fpg_sz;
+ __le16 csecs;
+ __le16 sos;
+ __le16 rsvd2;
+ __le32 trdt;
+ __le32 trdm;
+ __le32 tprt;
+ __le32 tprm;
+ __le32 tbet;
+ __le32 tbem;
+ __le32 mpos;
+ __le32 mccap;
+ __le16 cpar;
+ __u8 reserved[10];
+ struct nvme_nvm_lp_tbl lptbl;
+} __packed;
+
+struct nvme_nvm_addr_format {
+ __u8 ch_offset;
+ __u8 ch_len;
+ __u8 lun_offset;
+ __u8 lun_len;
+ __u8 pln_offset;
+ __u8 pln_len;
+ __u8 blk_offset;
+ __u8 blk_len;
+ __u8 pg_offset;
+ __u8 pg_len;
+ __u8 sect_offset;
+ __u8 sect_len;
+ __u8 res[4];
+} __packed;
+
+struct nvme_nvm_id {
+ __u8 ver_id;
+ __u8 vmnt;
+ __u8 cgrps;
+ __u8 res;
+ __le32 cap;
+ __le32 dom;
+ struct nvme_nvm_addr_format ppaf;
+ __u8 resv[228];
+ struct nvme_nvm_id_group groups[4];
+} __packed;
+
+struct nvme_nvm_bb_tbl {
+ __u8 tblid[4];
+ __le16 verid;
+ __le16 revid;
+ __le32 rvsd1;
+ __le32 tblks;
+ __le32 tfact;
+ __le32 tgrown;
+ __le32 tdresv;
+ __le32 thresv;
+ __le32 rsvd2[8];
+ __u8 blk[0];
+};
+
+/*
+ * Check we didn't inadvertently grow the command struct
+ */
+static inline void _nvme_nvm_check_size(void)
+{
+ BUILD_BUG_ON(sizeof(struct nvme_nvm_identity) != 64);
+ BUILD_BUG_ON(sizeof(struct nvme_nvm_hb_rw) != 64);
+ BUILD_BUG_ON(sizeof(struct nvme_nvm_ph_rw) != 64);
+ BUILD_BUG_ON(sizeof(struct nvme_nvm_getbbtbl) != 64);
+ BUILD_BUG_ON(sizeof(struct nvme_nvm_setbbtbl) != 64);
+ BUILD_BUG_ON(sizeof(struct nvme_nvm_l2ptbl) != 64);
+ BUILD_BUG_ON(sizeof(struct nvme_nvm_erase_blk) != 64);
+ BUILD_BUG_ON(sizeof(struct nvme_nvm_id_group) != 960);
+ BUILD_BUG_ON(sizeof(struct nvme_nvm_addr_format) != 16);
+ BUILD_BUG_ON(sizeof(struct nvme_nvm_id) != NVME_IDENTIFY_DATA_SIZE);
+ BUILD_BUG_ON(sizeof(struct nvme_nvm_bb_tbl) != 64);
+}
+
+static int init_grps(struct nvm_id *nvm_id, struct nvme_nvm_id *nvme_nvm_id)
+{
+ struct nvme_nvm_id_group *src;
+ struct nvm_id_group *dst;
+
+ if (nvme_nvm_id->cgrps != 1)
+ return -EINVAL;
+
+ src = &nvme_nvm_id->groups[0];
+ dst = &nvm_id->grp;
+
+ dst->mtype = src->mtype;
+ dst->fmtype = src->fmtype;
+ dst->num_ch = src->num_ch;
+ dst->num_lun = src->num_lun;
+ dst->num_pln = src->num_pln;
+
+ dst->num_pg = le16_to_cpu(src->num_pg);
+ dst->num_blk = le16_to_cpu(src->num_blk);
+ dst->fpg_sz = le16_to_cpu(src->fpg_sz);
+ dst->csecs = le16_to_cpu(src->csecs);
+ dst->sos = le16_to_cpu(src->sos);
+
+ dst->trdt = le32_to_cpu(src->trdt);
+ dst->trdm = le32_to_cpu(src->trdm);
+ dst->tprt = le32_to_cpu(src->tprt);
+ dst->tprm = le32_to_cpu(src->tprm);
+ dst->tbet = le32_to_cpu(src->tbet);
+ dst->tbem = le32_to_cpu(src->tbem);
+ dst->mpos = le32_to_cpu(src->mpos);
+ dst->mccap = le32_to_cpu(src->mccap);
+
+ dst->cpar = le16_to_cpu(src->cpar);
+
+ if (dst->fmtype == NVM_ID_FMTYPE_MLC) {
+ memcpy(dst->lptbl.id, src->lptbl.id, 8);
+ dst->lptbl.mlc.num_pairs =
+ le16_to_cpu(src->lptbl.mlc.num_pairs);
+
+ if (dst->lptbl.mlc.num_pairs > NVME_NVM_LP_MLC_PAIRS) {
+ pr_err("nvm: number of MLC pairs not supported\n");
+ return -EINVAL;
+ }
+
+ memcpy(dst->lptbl.mlc.pairs, src->lptbl.mlc.pairs,
+ dst->lptbl.mlc.num_pairs);
+ }
+
+ return 0;
+}
+
+static int nvme_nvm_identity(struct nvm_dev *nvmdev, struct nvm_id *nvm_id)
+{
+ struct nvme_ns *ns = nvmdev->q->queuedata;
+ struct nvme_nvm_id *nvme_nvm_id;
+ struct nvme_nvm_command c = {};
+ int ret;
+
+ c.identity.opcode = nvme_nvm_admin_identity;
+ c.identity.nsid = cpu_to_le32(ns->ns_id);
+ c.identity.chnl_off = 0;
+
+ nvme_nvm_id = kmalloc(sizeof(struct nvme_nvm_id), GFP_KERNEL);
+ if (!nvme_nvm_id)
+ return -ENOMEM;
+
+ ret = nvme_submit_sync_cmd(ns->ctrl->admin_q, (struct nvme_command *)&c,
+ nvme_nvm_id, sizeof(struct nvme_nvm_id));
+ if (ret) {
+ ret = -EIO;
+ goto out;
+ }
+
+ nvm_id->ver_id = nvme_nvm_id->ver_id;
+ nvm_id->vmnt = nvme_nvm_id->vmnt;
+ nvm_id->cap = le32_to_cpu(nvme_nvm_id->cap);
+ nvm_id->dom = le32_to_cpu(nvme_nvm_id->dom);
+ memcpy(&nvm_id->ppaf, &nvme_nvm_id->ppaf,
+ sizeof(struct nvm_addr_format));
+
+ ret = init_grps(nvm_id, nvme_nvm_id);
+out:
+ kfree(nvme_nvm_id);
+ return ret;
+}
+
+static int nvme_nvm_get_l2p_tbl(struct nvm_dev *nvmdev, u64 slba, u32 nlb,
+ nvm_l2p_update_fn *update_l2p, void *priv)
+{
+ struct nvme_ns *ns = nvmdev->q->queuedata;
+ struct nvme_nvm_command c = {};
+ u32 len = queue_max_hw_sectors(ns->ctrl->admin_q) << 9;
+ u32 nlb_pr_rq = len / sizeof(u64);
+ u64 cmd_slba = slba;
+ void *entries;
+ int ret = 0;
+
+ c.l2p.opcode = nvme_nvm_admin_get_l2p_tbl;
+ c.l2p.nsid = cpu_to_le32(ns->ns_id);
+ entries = kmalloc(len, GFP_KERNEL);
+ if (!entries)
+ return -ENOMEM;
+
+ while (nlb) {
+ u32 cmd_nlb = min(nlb_pr_rq, nlb);
+ u64 elba = slba + cmd_nlb;
+
+ c.l2p.slba = cpu_to_le64(cmd_slba);
+ c.l2p.nlb = cpu_to_le32(cmd_nlb);
+
+ ret = nvme_submit_sync_cmd(ns->ctrl->admin_q,
+ (struct nvme_command *)&c, entries, len);
+ if (ret) {
+ dev_err(ns->ctrl->device,
+ "L2P table transfer failed (%d)\n", ret);
+ ret = -EIO;
+ goto out;
+ }
+
+ if (unlikely(elba > nvmdev->total_secs)) {
+ pr_err("nvm: L2P data from device is out of bounds!\n");
+ ret = -EINVAL;
+ goto out;
+ }
+
+ /* Transform physical address to target address space */
+ nvm_part_to_tgt(nvmdev, entries, cmd_nlb);
+
+ if (update_l2p(cmd_slba, cmd_nlb, entries, priv)) {
+ ret = -EINTR;
+ goto out;
+ }
+
+ cmd_slba += cmd_nlb;
+ nlb -= cmd_nlb;
+ }
+
+out:
+ kfree(entries);
+ return ret;
+}
+
+static int nvme_nvm_get_bb_tbl(struct nvm_dev *nvmdev, struct ppa_addr ppa,
+ u8 *blks)
+{
+ struct request_queue *q = nvmdev->q;
+ struct nvm_geo *geo = &nvmdev->geo;
+ struct nvme_ns *ns = q->queuedata;
+ struct nvme_ctrl *ctrl = ns->ctrl;
+ struct nvme_nvm_command c = {};
+ struct nvme_nvm_bb_tbl *bb_tbl;
+ int nr_blks = geo->blks_per_lun * geo->plane_mode;
+ int tblsz = sizeof(struct nvme_nvm_bb_tbl) + nr_blks;
+ int ret = 0;
+
+ c.get_bb.opcode = nvme_nvm_admin_get_bb_tbl;
+ c.get_bb.nsid = cpu_to_le32(ns->ns_id);
+ c.get_bb.spba = cpu_to_le64(ppa.ppa);
+
+ bb_tbl = kzalloc(tblsz, GFP_KERNEL);
+ if (!bb_tbl)
+ return -ENOMEM;
+
+ ret = nvme_submit_sync_cmd(ctrl->admin_q, (struct nvme_command *)&c,
+ bb_tbl, tblsz);
+ if (ret) {
+ dev_err(ctrl->device, "get bad block table failed (%d)\n", ret);
+ ret = -EIO;
+ goto out;
+ }
+
+ if (bb_tbl->tblid[0] != 'B' || bb_tbl->tblid[1] != 'B' ||
+ bb_tbl->tblid[2] != 'L' || bb_tbl->tblid[3] != 'T') {
+ dev_err(ctrl->device, "bbt format mismatch\n");
+ ret = -EINVAL;
+ goto out;
+ }
+
+ if (le16_to_cpu(bb_tbl->verid) != 1) {
+ ret = -EINVAL;
+ dev_err(ctrl->device, "bbt version not supported\n");
+ goto out;
+ }
+
+ if (le32_to_cpu(bb_tbl->tblks) != nr_blks) {
+ ret = -EINVAL;
+ dev_err(ctrl->device,
+ "bbt unsuspected blocks returned (%u!=%u)",
+ le32_to_cpu(bb_tbl->tblks), nr_blks);
+ goto out;
+ }
+
+ memcpy(blks, bb_tbl->blk, geo->blks_per_lun * geo->plane_mode);
+out:
+ kfree(bb_tbl);
+ return ret;
+}
+
+static int nvme_nvm_set_bb_tbl(struct nvm_dev *nvmdev, struct ppa_addr *ppas,
+ int nr_ppas, int type)
+{
+ struct nvme_ns *ns = nvmdev->q->queuedata;
+ struct nvme_nvm_command c = {};
+ int ret = 0;
+
+ c.set_bb.opcode = nvme_nvm_admin_set_bb_tbl;
+ c.set_bb.nsid = cpu_to_le32(ns->ns_id);
+ c.set_bb.spba = cpu_to_le64(ppas->ppa);
+ c.set_bb.nlb = cpu_to_le16(nr_ppas - 1);
+ c.set_bb.value = type;
+
+ ret = nvme_submit_sync_cmd(ns->ctrl->admin_q, (struct nvme_command *)&c,
+ NULL, 0);
+ if (ret)
+ dev_err(ns->ctrl->device, "set bad block table failed (%d)\n",
+ ret);
+ return ret;
+}
+
+static inline void nvme_nvm_rqtocmd(struct nvm_rq *rqd, struct nvme_ns *ns,
+ struct nvme_nvm_command *c)
+{
+ c->ph_rw.opcode = rqd->opcode;
+ c->ph_rw.nsid = cpu_to_le32(ns->ns_id);
+ c->ph_rw.spba = cpu_to_le64(rqd->ppa_addr.ppa);
+ c->ph_rw.metadata = cpu_to_le64(rqd->dma_meta_list);
+ c->ph_rw.control = cpu_to_le16(rqd->flags);
+ c->ph_rw.length = cpu_to_le16(rqd->nr_ppas - 1);
+
+ if (rqd->opcode == NVM_OP_HBWRITE || rqd->opcode == NVM_OP_HBREAD)
+ c->hb_rw.slba = cpu_to_le64(nvme_block_nr(ns,
+ rqd->bio->bi_iter.bi_sector));
+}
+
+static void nvme_nvm_end_io(struct request *rq, blk_status_t status)
+{
+ struct nvm_rq *rqd = rq->end_io_data;
+
+ rqd->ppa_status = le64_to_cpu(nvme_req(rq)->result.u64);
+ rqd->error = nvme_req(rq)->status;
+ nvm_end_io(rqd);
+
+ kfree(nvme_req(rq)->cmd);
+ blk_mq_free_request(rq);
+}
+
+static int nvme_nvm_submit_io(struct nvm_dev *dev, struct nvm_rq *rqd)
+{
+ struct request_queue *q = dev->q;
+ struct nvme_ns *ns = q->queuedata;
+ struct request *rq;
+ struct bio *bio = rqd->bio;
+ struct nvme_nvm_command *cmd;
+
+ cmd = kzalloc(sizeof(struct nvme_nvm_command), GFP_KERNEL);
+ if (!cmd)
+ return -ENOMEM;
+
+ nvme_nvm_rqtocmd(rqd, ns, cmd);
+
+ rq = nvme_alloc_request(q, (struct nvme_command *)cmd, 0, NVME_QID_ANY);
+ if (IS_ERR(rq)) {
+ kfree(cmd);
+ return PTR_ERR(rq);
+ }
+ rq->cmd_flags &= ~REQ_FAILFAST_DRIVER;
+
+ if (bio) {
+ blk_init_request_from_bio(rq, bio);
+ } else {
+ rq->ioprio = IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, IOPRIO_NORM);
+ rq->__data_len = 0;
+ }
+
+ rq->end_io_data = rqd;
+
+ blk_execute_rq_nowait(q, NULL, rq, 0, nvme_nvm_end_io);
+
+ return 0;
+}
+
+static void *nvme_nvm_create_dma_pool(struct nvm_dev *nvmdev, char *name)
+{
+ struct nvme_ns *ns = nvmdev->q->queuedata;
+
+ return dma_pool_create(name, ns->ctrl->dev, PAGE_SIZE, PAGE_SIZE, 0);
+}
+
+static void nvme_nvm_destroy_dma_pool(void *pool)
+{
+ struct dma_pool *dma_pool = pool;
+
+ dma_pool_destroy(dma_pool);
+}
+
+static void *nvme_nvm_dev_dma_alloc(struct nvm_dev *dev, void *pool,
+ gfp_t mem_flags, dma_addr_t *dma_handler)
+{
+ return dma_pool_alloc(pool, mem_flags, dma_handler);
+}
+
+static void nvme_nvm_dev_dma_free(void *pool, void *addr,
+ dma_addr_t dma_handler)
+{
+ dma_pool_free(pool, addr, dma_handler);
+}
+
+static struct nvm_dev_ops nvme_nvm_dev_ops = {
+ .identity = nvme_nvm_identity,
+
+ .get_l2p_tbl = nvme_nvm_get_l2p_tbl,
+
+ .get_bb_tbl = nvme_nvm_get_bb_tbl,
+ .set_bb_tbl = nvme_nvm_set_bb_tbl,
+
+ .submit_io = nvme_nvm_submit_io,
+
+ .create_dma_pool = nvme_nvm_create_dma_pool,
+ .destroy_dma_pool = nvme_nvm_destroy_dma_pool,
+ .dev_dma_alloc = nvme_nvm_dev_dma_alloc,
+ .dev_dma_free = nvme_nvm_dev_dma_free,
+
+ .max_phys_sect = 64,
+};
+
+static int nvme_nvm_submit_user_cmd(struct request_queue *q,
+ struct nvme_ns *ns,
+ struct nvme_nvm_command *vcmd,
+ void __user *ubuf, unsigned int bufflen,
+ void __user *meta_buf, unsigned int meta_len,
+ void __user *ppa_buf, unsigned int ppa_len,
+ u32 *result, u64 *status, unsigned int timeout)
+{
+ bool write = nvme_is_write((struct nvme_command *)vcmd);
+ struct nvm_dev *dev = ns->ndev;
+ struct gendisk *disk = ns->disk;
+ struct request *rq;
+ struct bio *bio = NULL;
+ __le64 *ppa_list = NULL;
+ dma_addr_t ppa_dma;
+ __le64 *metadata = NULL;
+ dma_addr_t metadata_dma;
+ DECLARE_COMPLETION_ONSTACK(wait);
+ int ret = 0;
+
+ rq = nvme_alloc_request(q, (struct nvme_command *)vcmd, 0,
+ NVME_QID_ANY);
+ if (IS_ERR(rq)) {
+ ret = -ENOMEM;
+ goto err_cmd;
+ }
+
+ rq->timeout = timeout ? timeout : ADMIN_TIMEOUT;
+
+ rq->cmd_flags &= ~REQ_FAILFAST_DRIVER;
+
+ if (ppa_buf && ppa_len) {
+ ppa_list = dma_pool_alloc(dev->dma_pool, GFP_KERNEL, &ppa_dma);
+ if (!ppa_list) {
+ ret = -ENOMEM;
+ goto err_rq;
+ }
+ if (copy_from_user(ppa_list, (void __user *)ppa_buf,
+ sizeof(u64) * (ppa_len + 1))) {
+ ret = -EFAULT;
+ goto err_ppa;
+ }
+ vcmd->ph_rw.spba = cpu_to_le64(ppa_dma);
+ } else {
+ vcmd->ph_rw.spba = cpu_to_le64((uintptr_t)ppa_buf);
+ }
+
+ if (ubuf && bufflen) {
+ ret = blk_rq_map_user(q, rq, NULL, ubuf, bufflen, GFP_KERNEL);
+ if (ret)
+ goto err_ppa;
+ bio = rq->bio;
+
+ if (meta_buf && meta_len) {
+ metadata = dma_pool_alloc(dev->dma_pool, GFP_KERNEL,
+ &metadata_dma);
+ if (!metadata) {
+ ret = -ENOMEM;
+ goto err_map;
+ }
+
+ if (write) {
+ if (copy_from_user(metadata,
+ (void __user *)meta_buf,
+ meta_len)) {
+ ret = -EFAULT;
+ goto err_meta;
+ }
+ }
+ vcmd->ph_rw.metadata = cpu_to_le64(metadata_dma);
+ }
+
+ bio->bi_disk = disk;
+ }
+
+ blk_execute_rq(q, NULL, rq, 0);
+
+ if (nvme_req(rq)->flags & NVME_REQ_CANCELLED)
+ ret = -EINTR;
+ else if (nvme_req(rq)->status & 0x7ff)
+ ret = -EIO;
+ if (result)
+ *result = nvme_req(rq)->status & 0x7ff;
+ if (status)
+ *status = le64_to_cpu(nvme_req(rq)->result.u64);
+
+ if (metadata && !ret && !write) {
+ if (copy_to_user(meta_buf, (void *)metadata, meta_len))
+ ret = -EFAULT;
+ }
+err_meta:
+ if (meta_buf && meta_len)
+ dma_pool_free(dev->dma_pool, metadata, metadata_dma);
+err_map:
+ if (bio)
+ blk_rq_unmap_user(bio);
+err_ppa:
+ if (ppa_buf && ppa_len)
+ dma_pool_free(dev->dma_pool, ppa_list, ppa_dma);
+err_rq:
+ blk_mq_free_request(rq);
+err_cmd:
+ return ret;
+}
+
+static int nvme_nvm_submit_vio(struct nvme_ns *ns,
+ struct nvm_user_vio __user *uvio)
+{
+ struct nvm_user_vio vio;
+ struct nvme_nvm_command c;
+ unsigned int length;
+ int ret;
+
+ if (copy_from_user(&vio, uvio, sizeof(vio)))
+ return -EFAULT;
+ if (vio.flags)
+ return -EINVAL;
+
+ memset(&c, 0, sizeof(c));
+ c.ph_rw.opcode = vio.opcode;
+ c.ph_rw.nsid = cpu_to_le32(ns->ns_id);
+ c.ph_rw.control = cpu_to_le16(vio.control);
+ c.ph_rw.length = cpu_to_le16(vio.nppas);
+
+ length = (vio.nppas + 1) << ns->lba_shift;
+
+ ret = nvme_nvm_submit_user_cmd(ns->queue, ns, &c,
+ (void __user *)(uintptr_t)vio.addr, length,
+ (void __user *)(uintptr_t)vio.metadata,
+ vio.metadata_len,
+ (void __user *)(uintptr_t)vio.ppa_list, vio.nppas,
+ &vio.result, &vio.status, 0);
+
+ if (ret && copy_to_user(uvio, &vio, sizeof(vio)))
+ return -EFAULT;
+
+ return ret;
+}
+
+static int nvme_nvm_user_vcmd(struct nvme_ns *ns, int admin,
+ struct nvm_passthru_vio __user *uvcmd)
+{
+ struct nvm_passthru_vio vcmd;
+ struct nvme_nvm_command c;
+ struct request_queue *q;
+ unsigned int timeout = 0;
+ int ret;
+
+ if (copy_from_user(&vcmd, uvcmd, sizeof(vcmd)))
+ return -EFAULT;
+ if ((vcmd.opcode != 0xF2) && (!capable(CAP_SYS_ADMIN)))
+ return -EACCES;
+ if (vcmd.flags)
+ return -EINVAL;
+
+ memset(&c, 0, sizeof(c));
+ c.common.opcode = vcmd.opcode;
+ c.common.nsid = cpu_to_le32(ns->ns_id);
+ c.common.cdw2[0] = cpu_to_le32(vcmd.cdw2);
+ c.common.cdw2[1] = cpu_to_le32(vcmd.cdw3);
+ /* cdw11-12 */
+ c.ph_rw.length = cpu_to_le16(vcmd.nppas);
+ c.ph_rw.control = cpu_to_le16(vcmd.control);
+ c.common.cdw10[3] = cpu_to_le32(vcmd.cdw13);
+ c.common.cdw10[4] = cpu_to_le32(vcmd.cdw14);
+ c.common.cdw10[5] = cpu_to_le32(vcmd.cdw15);
+
+ if (vcmd.timeout_ms)
+ timeout = msecs_to_jiffies(vcmd.timeout_ms);
+
+ q = admin ? ns->ctrl->admin_q : ns->queue;
+
+ ret = nvme_nvm_submit_user_cmd(q, ns,
+ (struct nvme_nvm_command *)&c,
+ (void __user *)(uintptr_t)vcmd.addr, vcmd.data_len,
+ (void __user *)(uintptr_t)vcmd.metadata,
+ vcmd.metadata_len,
+ (void __user *)(uintptr_t)vcmd.ppa_list, vcmd.nppas,
+ &vcmd.result, &vcmd.status, timeout);
+
+ if (ret && copy_to_user(uvcmd, &vcmd, sizeof(vcmd)))
+ return -EFAULT;
+
+ return ret;
+}
+
+int nvme_nvm_ioctl(struct nvme_ns *ns, unsigned int cmd, unsigned long arg)
+{
+ switch (cmd) {
+ case NVME_NVM_IOCTL_ADMIN_VIO:
+ return nvme_nvm_user_vcmd(ns, 1, (void __user *)arg);
+ case NVME_NVM_IOCTL_IO_VIO:
+ return nvme_nvm_user_vcmd(ns, 0, (void __user *)arg);
+ case NVME_NVM_IOCTL_SUBMIT_VIO:
+ return nvme_nvm_submit_vio(ns, (void __user *)arg);
+ default:
+ return -ENOTTY;
+ }
+}
+
+int nvme_nvm_register(struct nvme_ns *ns, char *disk_name, int node)
+{
+ struct request_queue *q = ns->queue;
+ struct nvm_dev *dev;
+
+ _nvme_nvm_check_size();
+
+ dev = nvm_alloc_dev(node);
+ if (!dev)
+ return -ENOMEM;
+
+ dev->q = q;
+ memcpy(dev->name, disk_name, DISK_NAME_LEN);
+ dev->ops = &nvme_nvm_dev_ops;
+ dev->private_data = ns;
+ ns->ndev = dev;
+
+ return nvm_register(dev);
+}
+
+void nvme_nvm_unregister(struct nvme_ns *ns)
+{
+ nvm_unregister(ns->ndev);
+}
+
+static ssize_t nvm_dev_attr_show(struct device *dev,
+ struct device_attribute *dattr, char *page)
+{
+ struct nvme_ns *ns = nvme_get_ns_from_dev(dev);
+ struct nvm_dev *ndev = ns->ndev;
+ struct nvm_id *id;
+ struct nvm_id_group *grp;
+ struct attribute *attr;
+
+ if (!ndev)
+ return 0;
+
+ id = &ndev->identity;
+ grp = &id->grp;
+ attr = &dattr->attr;
+
+ if (strcmp(attr->name, "version") == 0) {
+ return scnprintf(page, PAGE_SIZE, "%u\n", id->ver_id);
+ } else if (strcmp(attr->name, "vendor_opcode") == 0) {
+ return scnprintf(page, PAGE_SIZE, "%u\n", id->vmnt);
+ } else if (strcmp(attr->name, "capabilities") == 0) {
+ return scnprintf(page, PAGE_SIZE, "%u\n", id->cap);
+ } else if (strcmp(attr->name, "device_mode") == 0) {
+ return scnprintf(page, PAGE_SIZE, "%u\n", id->dom);
+ /* kept for compatibility */
+ } else if (strcmp(attr->name, "media_manager") == 0) {
+ return scnprintf(page, PAGE_SIZE, "%s\n", "gennvm");
+ } else if (strcmp(attr->name, "ppa_format") == 0) {
+ return scnprintf(page, PAGE_SIZE,
+ "0x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x\n",
+ id->ppaf.ch_offset, id->ppaf.ch_len,
+ id->ppaf.lun_offset, id->ppaf.lun_len,
+ id->ppaf.pln_offset, id->ppaf.pln_len,
+ id->ppaf.blk_offset, id->ppaf.blk_len,
+ id->ppaf.pg_offset, id->ppaf.pg_len,
+ id->ppaf.sect_offset, id->ppaf.sect_len);
+ } else if (strcmp(attr->name, "media_type") == 0) { /* u8 */
+ return scnprintf(page, PAGE_SIZE, "%u\n", grp->mtype);
+ } else if (strcmp(attr->name, "flash_media_type") == 0) {
+ return scnprintf(page, PAGE_SIZE, "%u\n", grp->fmtype);
+ } else if (strcmp(attr->name, "num_channels") == 0) {
+ return scnprintf(page, PAGE_SIZE, "%u\n", grp->num_ch);
+ } else if (strcmp(attr->name, "num_luns") == 0) {
+ return scnprintf(page, PAGE_SIZE, "%u\n", grp->num_lun);
+ } else if (strcmp(attr->name, "num_planes") == 0) {
+ return scnprintf(page, PAGE_SIZE, "%u\n", grp->num_pln);
+ } else if (strcmp(attr->name, "num_blocks") == 0) { /* u16 */
+ return scnprintf(page, PAGE_SIZE, "%u\n", grp->num_blk);
+ } else if (strcmp(attr->name, "num_pages") == 0) {
+ return scnprintf(page, PAGE_SIZE, "%u\n", grp->num_pg);
+ } else if (strcmp(attr->name, "page_size") == 0) {
+ return scnprintf(page, PAGE_SIZE, "%u\n", grp->fpg_sz);
+ } else if (strcmp(attr->name, "hw_sector_size") == 0) {
+ return scnprintf(page, PAGE_SIZE, "%u\n", grp->csecs);
+ } else if (strcmp(attr->name, "oob_sector_size") == 0) {/* u32 */
+ return scnprintf(page, PAGE_SIZE, "%u\n", grp->sos);
+ } else if (strcmp(attr->name, "read_typ") == 0) {
+ return scnprintf(page, PAGE_SIZE, "%u\n", grp->trdt);
+ } else if (strcmp(attr->name, "read_max") == 0) {
+ return scnprintf(page, PAGE_SIZE, "%u\n", grp->trdm);
+ } else if (strcmp(attr->name, "prog_typ") == 0) {
+ return scnprintf(page, PAGE_SIZE, "%u\n", grp->tprt);
+ } else if (strcmp(attr->name, "prog_max") == 0) {
+ return scnprintf(page, PAGE_SIZE, "%u\n", grp->tprm);
+ } else if (strcmp(attr->name, "erase_typ") == 0) {
+ return scnprintf(page, PAGE_SIZE, "%u\n", grp->tbet);
+ } else if (strcmp(attr->name, "erase_max") == 0) {
+ return scnprintf(page, PAGE_SIZE, "%u\n", grp->tbem);
+ } else if (strcmp(attr->name, "multiplane_modes") == 0) {
+ return scnprintf(page, PAGE_SIZE, "0x%08x\n", grp->mpos);
+ } else if (strcmp(attr->name, "media_capabilities") == 0) {
+ return scnprintf(page, PAGE_SIZE, "0x%08x\n", grp->mccap);
+ } else if (strcmp(attr->name, "max_phys_secs") == 0) {
+ return scnprintf(page, PAGE_SIZE, "%u\n",
+ ndev->ops->max_phys_sect);
+ } else {
+ return scnprintf(page,
+ PAGE_SIZE,
+ "Unhandled attr(%s) in `nvm_dev_attr_show`\n",
+ attr->name);
+ }
+}
+
+#define NVM_DEV_ATTR_RO(_name) \
+ DEVICE_ATTR(_name, S_IRUGO, nvm_dev_attr_show, NULL)
+
+static NVM_DEV_ATTR_RO(version);
+static NVM_DEV_ATTR_RO(vendor_opcode);
+static NVM_DEV_ATTR_RO(capabilities);
+static NVM_DEV_ATTR_RO(device_mode);
+static NVM_DEV_ATTR_RO(ppa_format);
+static NVM_DEV_ATTR_RO(media_manager);
+
+static NVM_DEV_ATTR_RO(media_type);
+static NVM_DEV_ATTR_RO(flash_media_type);
+static NVM_DEV_ATTR_RO(num_channels);
+static NVM_DEV_ATTR_RO(num_luns);
+static NVM_DEV_ATTR_RO(num_planes);
+static NVM_DEV_ATTR_RO(num_blocks);
+static NVM_DEV_ATTR_RO(num_pages);
+static NVM_DEV_ATTR_RO(page_size);
+static NVM_DEV_ATTR_RO(hw_sector_size);
+static NVM_DEV_ATTR_RO(oob_sector_size);
+static NVM_DEV_ATTR_RO(read_typ);
+static NVM_DEV_ATTR_RO(read_max);
+static NVM_DEV_ATTR_RO(prog_typ);
+static NVM_DEV_ATTR_RO(prog_max);
+static NVM_DEV_ATTR_RO(erase_typ);
+static NVM_DEV_ATTR_RO(erase_max);
+static NVM_DEV_ATTR_RO(multiplane_modes);
+static NVM_DEV_ATTR_RO(media_capabilities);
+static NVM_DEV_ATTR_RO(max_phys_secs);
+
+static struct attribute *nvm_dev_attrs[] = {
+ &dev_attr_version.attr,
+ &dev_attr_vendor_opcode.attr,
+ &dev_attr_capabilities.attr,
+ &dev_attr_device_mode.attr,
+ &dev_attr_media_manager.attr,
+
+ &dev_attr_ppa_format.attr,
+ &dev_attr_media_type.attr,
+ &dev_attr_flash_media_type.attr,
+ &dev_attr_num_channels.attr,
+ &dev_attr_num_luns.attr,
+ &dev_attr_num_planes.attr,
+ &dev_attr_num_blocks.attr,
+ &dev_attr_num_pages.attr,
+ &dev_attr_page_size.attr,
+ &dev_attr_hw_sector_size.attr,
+ &dev_attr_oob_sector_size.attr,
+ &dev_attr_read_typ.attr,
+ &dev_attr_read_max.attr,
+ &dev_attr_prog_typ.attr,
+ &dev_attr_prog_max.attr,
+ &dev_attr_erase_typ.attr,
+ &dev_attr_erase_max.attr,
+ &dev_attr_multiplane_modes.attr,
+ &dev_attr_media_capabilities.attr,
+ &dev_attr_max_phys_secs.attr,
+ NULL,
+};
+
+static const struct attribute_group nvm_dev_attr_group = {
+ .name = "lightnvm",
+ .attrs = nvm_dev_attrs,
+};
+
+int nvme_nvm_register_sysfs(struct nvme_ns *ns)
+{
+ return sysfs_create_group(&disk_to_dev(ns->disk)->kobj,
+ &nvm_dev_attr_group);
+}
+
+void nvme_nvm_unregister_sysfs(struct nvme_ns *ns)
+{
+ sysfs_remove_group(&disk_to_dev(ns->disk)->kobj,
+ &nvm_dev_attr_group);
+}
diff --git a/src/kernel/linux/v4.14/drivers/nvme/host/nvme.h b/src/kernel/linux/v4.14/drivers/nvme/host/nvme.h
new file mode 100644
index 0000000..7ef0a8e
--- /dev/null
+++ b/src/kernel/linux/v4.14/drivers/nvme/host/nvme.h
@@ -0,0 +1,369 @@
+/*
+ * Copyright (c) 2011-2014, Intel Corporation.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ */
+
+#ifndef _NVME_H
+#define _NVME_H
+
+#include <linux/nvme.h>
+#include <linux/pci.h>
+#include <linux/kref.h>
+#include <linux/blk-mq.h>
+#include <linux/lightnvm.h>
+#include <linux/sed-opal.h>
+
+extern unsigned char nvme_io_timeout;
+#define NVME_IO_TIMEOUT (nvme_io_timeout * HZ)
+
+extern unsigned char admin_timeout;
+#define ADMIN_TIMEOUT (admin_timeout * HZ)
+
+#define NVME_DEFAULT_KATO 5
+#define NVME_KATO_GRACE 10
+
+extern struct workqueue_struct *nvme_wq;
+
+enum {
+ NVME_NS_LBA = 0,
+ NVME_NS_LIGHTNVM = 1,
+};
+
+/*
+ * List of workarounds for devices that required behavior not specified in
+ * the standard.
+ */
+enum nvme_quirks {
+ /*
+ * Prefers I/O aligned to a stripe size specified in a vendor
+ * specific Identify field.
+ */
+ NVME_QUIRK_STRIPE_SIZE = (1 << 0),
+
+ /*
+ * The controller doesn't handle Identify value others than 0 or 1
+ * correctly.
+ */
+ NVME_QUIRK_IDENTIFY_CNS = (1 << 1),
+
+ /*
+ * The controller deterministically returns O's on reads to
+ * logical blocks that deallocate was called on.
+ */
+ NVME_QUIRK_DEALLOCATE_ZEROES = (1 << 2),
+
+ /*
+ * The controller needs a delay before starts checking the device
+ * readiness, which is done by reading the NVME_CSTS_RDY bit.
+ */
+ NVME_QUIRK_DELAY_BEFORE_CHK_RDY = (1 << 3),
+
+ /*
+ * APST should not be used.
+ */
+ NVME_QUIRK_NO_APST = (1 << 4),
+
+ /*
+ * The deepest sleep state should not be used.
+ */
+ NVME_QUIRK_NO_DEEPEST_PS = (1 << 5),
+
+ /*
+ * Supports the LighNVM command set if indicated in vs[1].
+ */
+ NVME_QUIRK_LIGHTNVM = (1 << 6),
+
+ /*
+ * Set MEDIUM priority on SQ creation
+ */
+ NVME_QUIRK_MEDIUM_PRIO_SQ = (1 << 7),
+};
+
+/*
+ * Common request structure for NVMe passthrough. All drivers must have
+ * this structure as the first member of their request-private data.
+ */
+struct nvme_request {
+ struct nvme_command *cmd;
+ union nvme_result result;
+ u8 retries;
+ u8 flags;
+ u16 status;
+};
+
+enum {
+ NVME_REQ_CANCELLED = (1 << 0),
+};
+
+static inline struct nvme_request *nvme_req(struct request *req)
+{
+ return blk_mq_rq_to_pdu(req);
+}
+
+/* The below value is the specific amount of delay needed before checking
+ * readiness in case of the PCI_DEVICE(0x1c58, 0x0003), which needs the
+ * NVME_QUIRK_DELAY_BEFORE_CHK_RDY quirk enabled. The value (in ms) was
+ * found empirically.
+ */
+#define NVME_QUIRK_DELAY_AMOUNT 2300
+
+enum nvme_ctrl_state {
+ NVME_CTRL_NEW,
+ NVME_CTRL_LIVE,
+ NVME_CTRL_RESETTING,
+ NVME_CTRL_RECONNECTING,
+ NVME_CTRL_DELETING,
+ NVME_CTRL_DEAD,
+};
+
+struct nvme_ctrl {
+ enum nvme_ctrl_state state;
+ bool identified;
+ spinlock_t lock;
+ const struct nvme_ctrl_ops *ops;
+ struct request_queue *admin_q;
+ struct request_queue *connect_q;
+ struct device *dev;
+ struct kref kref;
+ int instance;
+ struct blk_mq_tag_set *tagset;
+ struct blk_mq_tag_set *admin_tagset;
+ struct list_head namespaces;
+ struct mutex namespaces_mutex;
+ struct device *device; /* char device */
+ struct list_head node;
+ struct ida ns_ida;
+ struct work_struct reset_work;
+
+ struct opal_dev *opal_dev;
+
+ char name[12];
+ char serial[20];
+ char model[40];
+ char firmware_rev[8];
+ char subnqn[NVMF_NQN_SIZE];
+ u16 cntlid;
+
+ u32 ctrl_config;
+ u16 mtfa;
+ u32 queue_count;
+
+ u64 cap;
+ u32 page_size;
+ u32 max_hw_sectors;
+ u16 oncs;
+ u16 vid;
+ u16 oacs;
+ u16 nssa;
+ u16 nr_streams;
+ atomic_t abort_limit;
+ u8 event_limit;
+ u8 vwc;
+ u32 vs;
+ u32 sgls;
+ u16 kas;
+ u8 npss;
+ u8 apsta;
+ unsigned int shutdown_timeout;
+ unsigned int kato;
+ bool subsystem;
+ unsigned long quirks;
+ struct nvme_id_power_state psd[32];
+ struct work_struct scan_work;
+ struct work_struct async_event_work;
+ struct delayed_work ka_work;
+ struct work_struct fw_act_work;
+
+ /* Power saving configuration */
+ u64 ps_max_latency_us;
+ bool apst_enabled;
+
+ /* PCIe only: */
+ u32 hmpre;
+ u32 hmmin;
+ u32 hmminds;
+ u16 hmmaxd;
+
+ /* Fabrics only */
+ u16 sqsize;
+ u32 ioccsz;
+ u32 iorcsz;
+ u16 icdoff;
+ u16 maxcmd;
+ int nr_reconnects;
+ struct nvmf_ctrl_options *opts;
+};
+
+struct nvme_ns {
+ struct list_head list;
+
+ struct nvme_ctrl *ctrl;
+ struct request_queue *queue;
+ struct gendisk *disk;
+ struct nvm_dev *ndev;
+ struct kref kref;
+ int instance;
+
+ u8 eui[8];
+ u8 nguid[16];
+ uuid_t uuid;
+
+ unsigned ns_id;
+ int lba_shift;
+ u16 ms;
+ u16 sgs;
+ u32 sws;
+ bool ext;
+ u8 pi_type;
+ unsigned long flags;
+#define NVME_NS_REMOVING 0
+#define NVME_NS_DEAD 1
+ u16 noiob;
+};
+
+struct nvme_ctrl_ops {
+ const char *name;
+ struct module *module;
+ unsigned int flags;
+#define NVME_F_FABRICS (1 << 0)
+#define NVME_F_METADATA_SUPPORTED (1 << 1)
+ int (*reg_read32)(struct nvme_ctrl *ctrl, u32 off, u32 *val);
+ int (*reg_write32)(struct nvme_ctrl *ctrl, u32 off, u32 val);
+ int (*reg_read64)(struct nvme_ctrl *ctrl, u32 off, u64 *val);
+ void (*free_ctrl)(struct nvme_ctrl *ctrl);
+ void (*submit_async_event)(struct nvme_ctrl *ctrl, int aer_idx);
+ int (*delete_ctrl)(struct nvme_ctrl *ctrl);
+ int (*get_address)(struct nvme_ctrl *ctrl, char *buf, int size);
+};
+
+static inline bool nvme_ctrl_ready(struct nvme_ctrl *ctrl)
+{
+ u32 val = 0;
+
+ if (ctrl->ops->reg_read32(ctrl, NVME_REG_CSTS, &val))
+ return false;
+ return val & NVME_CSTS_RDY;
+}
+
+static inline int nvme_reset_subsystem(struct nvme_ctrl *ctrl)
+{
+ if (!ctrl->subsystem)
+ return -ENOTTY;
+ return ctrl->ops->reg_write32(ctrl, NVME_REG_NSSR, 0x4E564D65);
+}
+
+static inline u64 nvme_block_nr(struct nvme_ns *ns, sector_t sector)
+{
+ return (sector >> (ns->lba_shift - 9));
+}
+
+static inline void nvme_cleanup_cmd(struct request *req)
+{
+ if (req->rq_flags & RQF_SPECIAL_PAYLOAD) {
+ kfree(page_address(req->special_vec.bv_page) +
+ req->special_vec.bv_offset);
+ }
+}
+
+static inline void nvme_end_request(struct request *req, __le16 status,
+ union nvme_result result)
+{
+ struct nvme_request *rq = nvme_req(req);
+
+ rq->status = le16_to_cpu(status) >> 1;
+ rq->result = result;
+ blk_mq_complete_request(req);
+}
+
+void nvme_complete_rq(struct request *req);
+void nvme_cancel_request(struct request *req, void *data, bool reserved);
+bool nvme_change_ctrl_state(struct nvme_ctrl *ctrl,
+ enum nvme_ctrl_state new_state);
+int nvme_disable_ctrl(struct nvme_ctrl *ctrl, u64 cap);
+int nvme_enable_ctrl(struct nvme_ctrl *ctrl, u64 cap);
+int nvme_shutdown_ctrl(struct nvme_ctrl *ctrl);
+int nvme_init_ctrl(struct nvme_ctrl *ctrl, struct device *dev,
+ const struct nvme_ctrl_ops *ops, unsigned long quirks);
+void nvme_uninit_ctrl(struct nvme_ctrl *ctrl);
+void nvme_start_ctrl(struct nvme_ctrl *ctrl);
+void nvme_stop_ctrl(struct nvme_ctrl *ctrl);
+void nvme_put_ctrl(struct nvme_ctrl *ctrl);
+int nvme_init_identify(struct nvme_ctrl *ctrl);
+
+void nvme_queue_scan(struct nvme_ctrl *ctrl);
+void nvme_remove_namespaces(struct nvme_ctrl *ctrl);
+
+int nvme_sec_submit(void *data, u16 spsp, u8 secp, void *buffer, size_t len,
+ bool send);
+
+#define NVME_NR_AERS 1
+void nvme_complete_async_event(struct nvme_ctrl *ctrl, __le16 status,
+ union nvme_result *res);
+void nvme_queue_async_events(struct nvme_ctrl *ctrl);
+
+void nvme_stop_queues(struct nvme_ctrl *ctrl);
+void nvme_start_queues(struct nvme_ctrl *ctrl);
+void nvme_kill_queues(struct nvme_ctrl *ctrl);
+void nvme_unfreeze(struct nvme_ctrl *ctrl);
+void nvme_wait_freeze(struct nvme_ctrl *ctrl);
+void nvme_wait_freeze_timeout(struct nvme_ctrl *ctrl, long timeout);
+void nvme_start_freeze(struct nvme_ctrl *ctrl);
+
+#define NVME_QID_ANY -1
+struct request *nvme_alloc_request(struct request_queue *q,
+ struct nvme_command *cmd, unsigned int flags, int qid);
+blk_status_t nvme_setup_cmd(struct nvme_ns *ns, struct request *req,
+ struct nvme_command *cmd);
+int nvme_submit_sync_cmd(struct request_queue *q, struct nvme_command *cmd,
+ void *buf, unsigned bufflen);
+int __nvme_submit_sync_cmd(struct request_queue *q, struct nvme_command *cmd,
+ union nvme_result *result, void *buffer, unsigned bufflen,
+ unsigned timeout, int qid, int at_head, int flags);
+int nvme_set_queue_count(struct nvme_ctrl *ctrl, int *count);
+void nvme_start_keep_alive(struct nvme_ctrl *ctrl);
+void nvme_stop_keep_alive(struct nvme_ctrl *ctrl);
+int nvme_reset_ctrl(struct nvme_ctrl *ctrl);
+
+#ifdef CONFIG_NVM
+int nvme_nvm_register(struct nvme_ns *ns, char *disk_name, int node);
+void nvme_nvm_unregister(struct nvme_ns *ns);
+int nvme_nvm_register_sysfs(struct nvme_ns *ns);
+void nvme_nvm_unregister_sysfs(struct nvme_ns *ns);
+int nvme_nvm_ioctl(struct nvme_ns *ns, unsigned int cmd, unsigned long arg);
+#else
+static inline int nvme_nvm_register(struct nvme_ns *ns, char *disk_name,
+ int node)
+{
+ return 0;
+}
+
+static inline void nvme_nvm_unregister(struct nvme_ns *ns) {};
+static inline int nvme_nvm_register_sysfs(struct nvme_ns *ns)
+{
+ return 0;
+}
+static inline void nvme_nvm_unregister_sysfs(struct nvme_ns *ns) {};
+static inline int nvme_nvm_ioctl(struct nvme_ns *ns, unsigned int cmd,
+ unsigned long arg)
+{
+ return -ENOTTY;
+}
+#endif /* CONFIG_NVM */
+
+static inline struct nvme_ns *nvme_get_ns_from_dev(struct device *dev)
+{
+ return dev_to_disk(dev)->private_data;
+}
+
+int __init nvme_core_init(void);
+void nvme_core_exit(void);
+
+#endif /* _NVME_H */
diff --git a/src/kernel/linux/v4.14/drivers/nvme/host/pci.c b/src/kernel/linux/v4.14/drivers/nvme/host/pci.c
new file mode 100644
index 0000000..3788c05
--- /dev/null
+++ b/src/kernel/linux/v4.14/drivers/nvme/host/pci.c
@@ -0,0 +1,2610 @@
+/*
+ * NVM Express device driver
+ * Copyright (c) 2011-2014, Intel Corporation.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ */
+
+#include <linux/aer.h>
+#include <linux/bitops.h>
+#include <linux/blkdev.h>
+#include <linux/blk-mq.h>
+#include <linux/blk-mq-pci.h>
+#include <linux/dmi.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/io.h>
+#include <linux/mm.h>
+#include <linux/module.h>
+#include <linux/mutex.h>
+#include <linux/once.h>
+#include <linux/pci.h>
+#include <linux/poison.h>
+#include <linux/t10-pi.h>
+#include <linux/timer.h>
+#include <linux/types.h>
+#include <linux/io-64-nonatomic-lo-hi.h>
+#include <asm/unaligned.h>
+#include <linux/sed-opal.h>
+
+#include "nvme.h"
+
+#define SQ_SIZE(depth) (depth * sizeof(struct nvme_command))
+#define CQ_SIZE(depth) (depth * sizeof(struct nvme_completion))
+
+/*
+ * We handle AEN commands ourselves and don't even let the
+ * block layer know about them.
+ */
+#define NVME_AQ_BLKMQ_DEPTH (NVME_AQ_DEPTH - NVME_NR_AERS)
+
+static int use_threaded_interrupts;
+module_param(use_threaded_interrupts, int, 0);
+
+static bool use_cmb_sqes = true;
+module_param(use_cmb_sqes, bool, 0644);
+MODULE_PARM_DESC(use_cmb_sqes, "use controller's memory buffer for I/O SQes");
+
+static unsigned int max_host_mem_size_mb = 128;
+module_param(max_host_mem_size_mb, uint, 0444);
+MODULE_PARM_DESC(max_host_mem_size_mb,
+ "Maximum Host Memory Buffer (HMB) size per controller (in MiB)");
+
+static int io_queue_depth_set(const char *val, const struct kernel_param *kp);
+static const struct kernel_param_ops io_queue_depth_ops = {
+ .set = io_queue_depth_set,
+ .get = param_get_int,
+};
+
+static int io_queue_depth = 1024;
+module_param_cb(io_queue_depth, &io_queue_depth_ops, &io_queue_depth, 0644);
+MODULE_PARM_DESC(io_queue_depth, "set io queue depth, should >= 2");
+
+struct nvme_dev;
+struct nvme_queue;
+
+static void nvme_process_cq(struct nvme_queue *nvmeq);
+static void nvme_dev_disable(struct nvme_dev *dev, bool shutdown);
+
+/*
+ * Represents an NVM Express device. Each nvme_dev is a PCI function.
+ */
+struct nvme_dev {
+ struct nvme_queue *queues;
+ struct blk_mq_tag_set tagset;
+ struct blk_mq_tag_set admin_tagset;
+ u32 __iomem *dbs;
+ struct device *dev;
+ struct dma_pool *prp_page_pool;
+ struct dma_pool *prp_small_pool;
+ unsigned online_queues;
+ unsigned max_qid;
+ int q_depth;
+ u32 db_stride;
+ void __iomem *bar;
+ unsigned long bar_mapped_size;
+ struct work_struct remove_work;
+ struct mutex shutdown_lock;
+ bool subsystem;
+ void __iomem *cmb;
+ pci_bus_addr_t cmb_bus_addr;
+ u64 cmb_size;
+ u32 cmbsz;
+ u32 cmbloc;
+ struct nvme_ctrl ctrl;
+ struct completion ioq_wait;
+
+ /* shadow doorbell buffer support: */
+ u32 *dbbuf_dbs;
+ dma_addr_t dbbuf_dbs_dma_addr;
+ u32 *dbbuf_eis;
+ dma_addr_t dbbuf_eis_dma_addr;
+
+ /* host memory buffer support: */
+ u64 host_mem_size;
+ u32 nr_host_mem_descs;
+ dma_addr_t host_mem_descs_dma;
+ struct nvme_host_mem_buf_desc *host_mem_descs;
+ void **host_mem_desc_bufs;
+};
+
+static int io_queue_depth_set(const char *val, const struct kernel_param *kp)
+{
+ int n = 0, ret;
+
+ ret = kstrtoint(val, 10, &n);
+ if (ret != 0 || n < 2)
+ return -EINVAL;
+
+ return param_set_int(val, kp);
+}
+
+static inline unsigned int sq_idx(unsigned int qid, u32 stride)
+{
+ return qid * 2 * stride;
+}
+
+static inline unsigned int cq_idx(unsigned int qid, u32 stride)
+{
+ return (qid * 2 + 1) * stride;
+}
+
+static inline struct nvme_dev *to_nvme_dev(struct nvme_ctrl *ctrl)
+{
+ return container_of(ctrl, struct nvme_dev, ctrl);
+}
+
+/*
+ * An NVM Express queue. Each device has at least two (one for admin
+ * commands and one for I/O commands).
+ */
+struct nvme_queue {
+ struct device *q_dmadev;
+ struct nvme_dev *dev;
+ spinlock_t q_lock;
+ struct nvme_command *sq_cmds;
+ struct nvme_command __iomem *sq_cmds_io;
+ volatile struct nvme_completion *cqes;
+ struct blk_mq_tags **tags;
+ dma_addr_t sq_dma_addr;
+ dma_addr_t cq_dma_addr;
+ u32 __iomem *q_db;
+ u16 q_depth;
+ s16 cq_vector;
+ u16 sq_tail;
+ u16 cq_head;
+ u16 qid;
+ u8 cq_phase;
+ u8 cqe_seen;
+ u32 *dbbuf_sq_db;
+ u32 *dbbuf_cq_db;
+ u32 *dbbuf_sq_ei;
+ u32 *dbbuf_cq_ei;
+};
+
+/*
+ * The nvme_iod describes the data in an I/O, including the list of PRP
+ * entries. You can't see it in this data structure because C doesn't let
+ * me express that. Use nvme_init_iod to ensure there's enough space
+ * allocated to store the PRP list.
+ */
+struct nvme_iod {
+ struct nvme_request req;
+ struct nvme_queue *nvmeq;
+ int aborted;
+ int npages; /* In the PRP list. 0 means small pool in use */
+ int nents; /* Used in scatterlist */
+ int length; /* Of data, in bytes */
+ dma_addr_t first_dma;
+ struct scatterlist meta_sg; /* metadata requires single contiguous buffer */
+ struct scatterlist *sg;
+ struct scatterlist inline_sg[0];
+};
+
+/*
+ * Check we didin't inadvertently grow the command struct
+ */
+static inline void _nvme_check_size(void)
+{
+ BUILD_BUG_ON(sizeof(struct nvme_rw_command) != 64);
+ BUILD_BUG_ON(sizeof(struct nvme_create_cq) != 64);
+ BUILD_BUG_ON(sizeof(struct nvme_create_sq) != 64);
+ BUILD_BUG_ON(sizeof(struct nvme_delete_queue) != 64);
+ BUILD_BUG_ON(sizeof(struct nvme_features) != 64);
+ BUILD_BUG_ON(sizeof(struct nvme_format_cmd) != 64);
+ BUILD_BUG_ON(sizeof(struct nvme_abort_cmd) != 64);
+ BUILD_BUG_ON(sizeof(struct nvme_command) != 64);
+ BUILD_BUG_ON(sizeof(struct nvme_id_ctrl) != NVME_IDENTIFY_DATA_SIZE);
+ BUILD_BUG_ON(sizeof(struct nvme_id_ns) != NVME_IDENTIFY_DATA_SIZE);
+ BUILD_BUG_ON(sizeof(struct nvme_lba_range_type) != 64);
+ BUILD_BUG_ON(sizeof(struct nvme_smart_log) != 512);
+ BUILD_BUG_ON(sizeof(struct nvme_dbbuf) != 64);
+}
+
+static inline unsigned int nvme_dbbuf_size(u32 stride)
+{
+ return ((num_possible_cpus() + 1) * 8 * stride);
+}
+
+static int nvme_dbbuf_dma_alloc(struct nvme_dev *dev)
+{
+ unsigned int mem_size = nvme_dbbuf_size(dev->db_stride);
+
+ if (dev->dbbuf_dbs)
+ return 0;
+
+ dev->dbbuf_dbs = dma_alloc_coherent(dev->dev, mem_size,
+ &dev->dbbuf_dbs_dma_addr,
+ GFP_KERNEL);
+ if (!dev->dbbuf_dbs)
+ return -ENOMEM;
+ dev->dbbuf_eis = dma_alloc_coherent(dev->dev, mem_size,
+ &dev->dbbuf_eis_dma_addr,
+ GFP_KERNEL);
+ if (!dev->dbbuf_eis) {
+ dma_free_coherent(dev->dev, mem_size,
+ dev->dbbuf_dbs, dev->dbbuf_dbs_dma_addr);
+ dev->dbbuf_dbs = NULL;
+ return -ENOMEM;
+ }
+
+ return 0;
+}
+
+static void nvme_dbbuf_dma_free(struct nvme_dev *dev)
+{
+ unsigned int mem_size = nvme_dbbuf_size(dev->db_stride);
+
+ if (dev->dbbuf_dbs) {
+ dma_free_coherent(dev->dev, mem_size,
+ dev->dbbuf_dbs, dev->dbbuf_dbs_dma_addr);
+ dev->dbbuf_dbs = NULL;
+ }
+ if (dev->dbbuf_eis) {
+ dma_free_coherent(dev->dev, mem_size,
+ dev->dbbuf_eis, dev->dbbuf_eis_dma_addr);
+ dev->dbbuf_eis = NULL;
+ }
+}
+
+static void nvme_dbbuf_init(struct nvme_dev *dev,
+ struct nvme_queue *nvmeq, int qid)
+{
+ if (!dev->dbbuf_dbs || !qid)
+ return;
+
+ nvmeq->dbbuf_sq_db = &dev->dbbuf_dbs[sq_idx(qid, dev->db_stride)];
+ nvmeq->dbbuf_cq_db = &dev->dbbuf_dbs[cq_idx(qid, dev->db_stride)];
+ nvmeq->dbbuf_sq_ei = &dev->dbbuf_eis[sq_idx(qid, dev->db_stride)];
+ nvmeq->dbbuf_cq_ei = &dev->dbbuf_eis[cq_idx(qid, dev->db_stride)];
+}
+
+static void nvme_dbbuf_set(struct nvme_dev *dev)
+{
+ struct nvme_command c;
+
+ if (!dev->dbbuf_dbs)
+ return;
+
+ memset(&c, 0, sizeof(c));
+ c.dbbuf.opcode = nvme_admin_dbbuf;
+ c.dbbuf.prp1 = cpu_to_le64(dev->dbbuf_dbs_dma_addr);
+ c.dbbuf.prp2 = cpu_to_le64(dev->dbbuf_eis_dma_addr);
+
+ if (nvme_submit_sync_cmd(dev->ctrl.admin_q, &c, NULL, 0)) {
+ dev_warn(dev->ctrl.device, "unable to set dbbuf\n");
+ /* Free memory and continue on */
+ nvme_dbbuf_dma_free(dev);
+ }
+}
+
+static inline int nvme_dbbuf_need_event(u16 event_idx, u16 new_idx, u16 old)
+{
+ return (u16)(new_idx - event_idx - 1) < (u16)(new_idx - old);
+}
+
+/* Update dbbuf and return true if an MMIO is required */
+static bool nvme_dbbuf_update_and_check_event(u16 value, u32 *dbbuf_db,
+ volatile u32 *dbbuf_ei)
+{
+ if (dbbuf_db) {
+ u16 old_value;
+
+ /*
+ * Ensure that the queue is written before updating
+ * the doorbell in memory
+ */
+ wmb();
+
+ old_value = *dbbuf_db;
+ *dbbuf_db = value;
+
+ /*
+ * Ensure that the doorbell is updated before reading the event
+ * index from memory. The controller needs to provide similar
+ * ordering to ensure the envent index is updated before reading
+ * the doorbell.
+ */
+ mb();
+
+ if (!nvme_dbbuf_need_event(*dbbuf_ei, value, old_value))
+ return false;
+ }
+
+ return true;
+}
+
+/*
+ * Max size of iod being embedded in the request payload
+ */
+#define NVME_INT_PAGES 2
+#define NVME_INT_BYTES(dev) (NVME_INT_PAGES * (dev)->ctrl.page_size)
+
+/*
+ * Will slightly overestimate the number of pages needed. This is OK
+ * as it only leads to a small amount of wasted memory for the lifetime of
+ * the I/O.
+ */
+static int nvme_npages(unsigned size, struct nvme_dev *dev)
+{
+ unsigned nprps = DIV_ROUND_UP(size + dev->ctrl.page_size,
+ dev->ctrl.page_size);
+ return DIV_ROUND_UP(8 * nprps, PAGE_SIZE - 8);
+}
+
+static unsigned int nvme_iod_alloc_size(struct nvme_dev *dev,
+ unsigned int size, unsigned int nseg)
+{
+ return sizeof(__le64 *) * nvme_npages(size, dev) +
+ sizeof(struct scatterlist) * nseg;
+}
+
+static unsigned int nvme_cmd_size(struct nvme_dev *dev)
+{
+ return sizeof(struct nvme_iod) +
+ nvme_iod_alloc_size(dev, NVME_INT_BYTES(dev), NVME_INT_PAGES);
+}
+
+static int nvme_admin_init_hctx(struct blk_mq_hw_ctx *hctx, void *data,
+ unsigned int hctx_idx)
+{
+ struct nvme_dev *dev = data;
+ struct nvme_queue *nvmeq = &dev->queues[0];
+
+ WARN_ON(hctx_idx != 0);
+ WARN_ON(dev->admin_tagset.tags[0] != hctx->tags);
+ WARN_ON(nvmeq->tags);
+
+ hctx->driver_data = nvmeq;
+ nvmeq->tags = &dev->admin_tagset.tags[0];
+ return 0;
+}
+
+static void nvme_admin_exit_hctx(struct blk_mq_hw_ctx *hctx, unsigned int hctx_idx)
+{
+ struct nvme_queue *nvmeq = hctx->driver_data;
+
+ nvmeq->tags = NULL;
+}
+
+static int nvme_init_hctx(struct blk_mq_hw_ctx *hctx, void *data,
+ unsigned int hctx_idx)
+{
+ struct nvme_dev *dev = data;
+ struct nvme_queue *nvmeq = &dev->queues[hctx_idx + 1];
+
+ if (!nvmeq->tags)
+ nvmeq->tags = &dev->tagset.tags[hctx_idx];
+
+ WARN_ON(dev->tagset.tags[hctx_idx] != hctx->tags);
+ hctx->driver_data = nvmeq;
+ return 0;
+}
+
+static int nvme_init_request(struct blk_mq_tag_set *set, struct request *req,
+ unsigned int hctx_idx, unsigned int numa_node)
+{
+ struct nvme_dev *dev = set->driver_data;
+ struct nvme_iod *iod = blk_mq_rq_to_pdu(req);
+ int queue_idx = (set == &dev->tagset) ? hctx_idx + 1 : 0;
+ struct nvme_queue *nvmeq = &dev->queues[queue_idx];
+
+ BUG_ON(!nvmeq);
+ iod->nvmeq = nvmeq;
+ return 0;
+}
+
+static int nvme_pci_map_queues(struct blk_mq_tag_set *set)
+{
+ struct nvme_dev *dev = set->driver_data;
+
+ return blk_mq_pci_map_queues(set, to_pci_dev(dev->dev));
+}
+
+/**
+ * __nvme_submit_cmd() - Copy a command into a queue and ring the doorbell
+ * @nvmeq: The queue to use
+ * @cmd: The command to send
+ *
+ * Safe to use from interrupt context
+ */
+static void __nvme_submit_cmd(struct nvme_queue *nvmeq,
+ struct nvme_command *cmd)
+{
+ u16 tail = nvmeq->sq_tail;
+
+ if (nvmeq->sq_cmds_io)
+ memcpy_toio(&nvmeq->sq_cmds_io[tail], cmd, sizeof(*cmd));
+ else
+ memcpy(&nvmeq->sq_cmds[tail], cmd, sizeof(*cmd));
+
+ if (++tail == nvmeq->q_depth)
+ tail = 0;
+ if (nvme_dbbuf_update_and_check_event(tail, nvmeq->dbbuf_sq_db,
+ nvmeq->dbbuf_sq_ei))
+ writel(tail, nvmeq->q_db);
+ nvmeq->sq_tail = tail;
+}
+
+static __le64 **iod_list(struct request *req)
+{
+ struct nvme_iod *iod = blk_mq_rq_to_pdu(req);
+ return (__le64 **)(iod->sg + blk_rq_nr_phys_segments(req));
+}
+
+static blk_status_t nvme_init_iod(struct request *rq, struct nvme_dev *dev)
+{
+ struct nvme_iod *iod = blk_mq_rq_to_pdu(rq);
+ int nseg = blk_rq_nr_phys_segments(rq);
+ unsigned int size = blk_rq_payload_bytes(rq);
+
+ if (nseg > NVME_INT_PAGES || size > NVME_INT_BYTES(dev)) {
+ iod->sg = kmalloc(nvme_iod_alloc_size(dev, size, nseg), GFP_ATOMIC);
+ if (!iod->sg)
+ return BLK_STS_RESOURCE;
+ } else {
+ iod->sg = iod->inline_sg;
+ }
+
+ iod->aborted = 0;
+ iod->npages = -1;
+ iod->nents = 0;
+ iod->length = size;
+
+ return BLK_STS_OK;
+}
+
+static void nvme_free_iod(struct nvme_dev *dev, struct request *req)
+{
+ struct nvme_iod *iod = blk_mq_rq_to_pdu(req);
+ const int last_prp = dev->ctrl.page_size / 8 - 1;
+ int i;
+ __le64 **list = iod_list(req);
+ dma_addr_t prp_dma = iod->first_dma;
+
+ if (iod->npages == 0)
+ dma_pool_free(dev->prp_small_pool, list[0], prp_dma);
+ for (i = 0; i < iod->npages; i++) {
+ __le64 *prp_list = list[i];
+ dma_addr_t next_prp_dma = le64_to_cpu(prp_list[last_prp]);
+ dma_pool_free(dev->prp_page_pool, prp_list, prp_dma);
+ prp_dma = next_prp_dma;
+ }
+
+ if (iod->sg != iod->inline_sg)
+ kfree(iod->sg);
+}
+
+#ifdef CONFIG_BLK_DEV_INTEGRITY
+static void nvme_dif_prep(u32 p, u32 v, struct t10_pi_tuple *pi)
+{
+ if (be32_to_cpu(pi->ref_tag) == v)
+ pi->ref_tag = cpu_to_be32(p);
+}
+
+static void nvme_dif_complete(u32 p, u32 v, struct t10_pi_tuple *pi)
+{
+ if (be32_to_cpu(pi->ref_tag) == p)
+ pi->ref_tag = cpu_to_be32(v);
+}
+
+/**
+ * nvme_dif_remap - remaps ref tags to bip seed and physical lba
+ *
+ * The virtual start sector is the one that was originally submitted by the
+ * block layer. Due to partitioning, MD/DM cloning, etc. the actual physical
+ * start sector may be different. Remap protection information to match the
+ * physical LBA on writes, and back to the original seed on reads.
+ *
+ * Type 0 and 3 do not have a ref tag, so no remapping required.
+ */
+static void nvme_dif_remap(struct request *req,
+ void (*dif_swap)(u32 p, u32 v, struct t10_pi_tuple *pi))
+{
+ struct nvme_ns *ns = req->rq_disk->private_data;
+ struct bio_integrity_payload *bip;
+ struct t10_pi_tuple *pi;
+ void *p, *pmap;
+ u32 i, nlb, ts, phys, virt;
+
+ if (!ns->pi_type || ns->pi_type == NVME_NS_DPS_PI_TYPE3)
+ return;
+
+ bip = bio_integrity(req->bio);
+ if (!bip)
+ return;
+
+ pmap = kmap_atomic(bip->bip_vec->bv_page) + bip->bip_vec->bv_offset;
+
+ p = pmap;
+ virt = bip_get_seed(bip);
+ phys = nvme_block_nr(ns, blk_rq_pos(req));
+ nlb = (blk_rq_bytes(req) >> ns->lba_shift);
+ ts = ns->disk->queue->integrity.tuple_size;
+
+ for (i = 0; i < nlb; i++, virt++, phys++) {
+ pi = (struct t10_pi_tuple *)p;
+ dif_swap(phys, virt, pi);
+ p += ts;
+ }
+ kunmap_atomic(pmap);
+}
+#else /* CONFIG_BLK_DEV_INTEGRITY */
+static void nvme_dif_remap(struct request *req,
+ void (*dif_swap)(u32 p, u32 v, struct t10_pi_tuple *pi))
+{
+}
+static void nvme_dif_prep(u32 p, u32 v, struct t10_pi_tuple *pi)
+{
+}
+static void nvme_dif_complete(u32 p, u32 v, struct t10_pi_tuple *pi)
+{
+}
+#endif
+
+static void nvme_print_sgl(struct scatterlist *sgl, int nents)
+{
+ int i;
+ struct scatterlist *sg;
+
+ for_each_sg(sgl, sg, nents, i) {
+ dma_addr_t phys = sg_phys(sg);
+ pr_warn("sg[%d] phys_addr:%pad offset:%d length:%d "
+ "dma_address:%pad dma_length:%d\n",
+ i, &phys, sg->offset, sg->length, &sg_dma_address(sg),
+ sg_dma_len(sg));
+ }
+}
+
+static blk_status_t nvme_setup_prps(struct nvme_dev *dev, struct request *req)
+{
+ struct nvme_iod *iod = blk_mq_rq_to_pdu(req);
+ struct dma_pool *pool;
+ int length = blk_rq_payload_bytes(req);
+ struct scatterlist *sg = iod->sg;
+ int dma_len = sg_dma_len(sg);
+ u64 dma_addr = sg_dma_address(sg);
+ u32 page_size = dev->ctrl.page_size;
+ int offset = dma_addr & (page_size - 1);
+ __le64 *prp_list;
+ __le64 **list = iod_list(req);
+ dma_addr_t prp_dma;
+ int nprps, i;
+
+ length -= (page_size - offset);
+ if (length <= 0) {
+ iod->first_dma = 0;
+ return BLK_STS_OK;
+ }
+
+ dma_len -= (page_size - offset);
+ if (dma_len) {
+ dma_addr += (page_size - offset);
+ } else {
+ sg = sg_next(sg);
+ dma_addr = sg_dma_address(sg);
+ dma_len = sg_dma_len(sg);
+ }
+
+ if (length <= page_size) {
+ iod->first_dma = dma_addr;
+ return BLK_STS_OK;
+ }
+
+ nprps = DIV_ROUND_UP(length, page_size);
+ if (nprps <= (256 / 8)) {
+ pool = dev->prp_small_pool;
+ iod->npages = 0;
+ } else {
+ pool = dev->prp_page_pool;
+ iod->npages = 1;
+ }
+
+ prp_list = dma_pool_alloc(pool, GFP_ATOMIC, &prp_dma);
+ if (!prp_list) {
+ iod->first_dma = dma_addr;
+ iod->npages = -1;
+ return BLK_STS_RESOURCE;
+ }
+ list[0] = prp_list;
+ iod->first_dma = prp_dma;
+ i = 0;
+ for (;;) {
+ if (i == page_size >> 3) {
+ __le64 *old_prp_list = prp_list;
+ prp_list = dma_pool_alloc(pool, GFP_ATOMIC, &prp_dma);
+ if (!prp_list)
+ return BLK_STS_RESOURCE;
+ list[iod->npages++] = prp_list;
+ prp_list[0] = old_prp_list[i - 1];
+ old_prp_list[i - 1] = cpu_to_le64(prp_dma);
+ i = 1;
+ }
+ prp_list[i++] = cpu_to_le64(dma_addr);
+ dma_len -= page_size;
+ dma_addr += page_size;
+ length -= page_size;
+ if (length <= 0)
+ break;
+ if (dma_len > 0)
+ continue;
+ if (unlikely(dma_len < 0))
+ goto bad_sgl;
+ sg = sg_next(sg);
+ dma_addr = sg_dma_address(sg);
+ dma_len = sg_dma_len(sg);
+ }
+
+ return BLK_STS_OK;
+
+ bad_sgl:
+ WARN(DO_ONCE(nvme_print_sgl, iod->sg, iod->nents),
+ "Invalid SGL for payload:%d nents:%d\n",
+ blk_rq_payload_bytes(req), iod->nents);
+ return BLK_STS_IOERR;
+}
+
+static blk_status_t nvme_map_data(struct nvme_dev *dev, struct request *req,
+ struct nvme_command *cmnd)
+{
+ struct nvme_iod *iod = blk_mq_rq_to_pdu(req);
+ struct request_queue *q = req->q;
+ enum dma_data_direction dma_dir = rq_data_dir(req) ?
+ DMA_TO_DEVICE : DMA_FROM_DEVICE;
+ blk_status_t ret = BLK_STS_IOERR;
+
+ sg_init_table(iod->sg, blk_rq_nr_phys_segments(req));
+ iod->nents = blk_rq_map_sg(q, req, iod->sg);
+ if (!iod->nents)
+ goto out;
+
+ ret = BLK_STS_RESOURCE;
+ if (!dma_map_sg_attrs(dev->dev, iod->sg, iod->nents, dma_dir,
+ DMA_ATTR_NO_WARN))
+ goto out;
+
+ ret = nvme_setup_prps(dev, req);
+ if (ret != BLK_STS_OK)
+ goto out_unmap;
+
+ ret = BLK_STS_IOERR;
+ if (blk_integrity_rq(req)) {
+ if (blk_rq_count_integrity_sg(q, req->bio) != 1)
+ goto out_unmap;
+
+ sg_init_table(&iod->meta_sg, 1);
+ if (blk_rq_map_integrity_sg(q, req->bio, &iod->meta_sg) != 1)
+ goto out_unmap;
+
+ if (req_op(req) == REQ_OP_WRITE)
+ nvme_dif_remap(req, nvme_dif_prep);
+
+ if (!dma_map_sg(dev->dev, &iod->meta_sg, 1, dma_dir))
+ goto out_unmap;
+ }
+
+ cmnd->rw.dptr.prp1 = cpu_to_le64(sg_dma_address(iod->sg));
+ cmnd->rw.dptr.prp2 = cpu_to_le64(iod->first_dma);
+ if (blk_integrity_rq(req))
+ cmnd->rw.metadata = cpu_to_le64(sg_dma_address(&iod->meta_sg));
+ return BLK_STS_OK;
+
+out_unmap:
+ dma_unmap_sg(dev->dev, iod->sg, iod->nents, dma_dir);
+out:
+ return ret;
+}
+
+static void nvme_unmap_data(struct nvme_dev *dev, struct request *req)
+{
+ struct nvme_iod *iod = blk_mq_rq_to_pdu(req);
+ enum dma_data_direction dma_dir = rq_data_dir(req) ?
+ DMA_TO_DEVICE : DMA_FROM_DEVICE;
+
+ if (iod->nents) {
+ dma_unmap_sg(dev->dev, iod->sg, iod->nents, dma_dir);
+ if (blk_integrity_rq(req)) {
+ if (req_op(req) == REQ_OP_READ)
+ nvme_dif_remap(req, nvme_dif_complete);
+ dma_unmap_sg(dev->dev, &iod->meta_sg, 1, dma_dir);
+ }
+ }
+
+ nvme_cleanup_cmd(req);
+ nvme_free_iod(dev, req);
+}
+
+/*
+ * NOTE: ns is NULL when called on the admin queue.
+ */
+static blk_status_t nvme_queue_rq(struct blk_mq_hw_ctx *hctx,
+ const struct blk_mq_queue_data *bd)
+{
+ struct nvme_ns *ns = hctx->queue->queuedata;
+ struct nvme_queue *nvmeq = hctx->driver_data;
+ struct nvme_dev *dev = nvmeq->dev;
+ struct request *req = bd->rq;
+ struct nvme_command cmnd;
+ blk_status_t ret;
+
+ ret = nvme_setup_cmd(ns, req, &cmnd);
+ if (ret)
+ return ret;
+
+ ret = nvme_init_iod(req, dev);
+ if (ret)
+ goto out_free_cmd;
+
+ if (blk_rq_nr_phys_segments(req)) {
+ ret = nvme_map_data(dev, req, &cmnd);
+ if (ret)
+ goto out_cleanup_iod;
+ }
+
+ blk_mq_start_request(req);
+
+ spin_lock_irq(&nvmeq->q_lock);
+ if (unlikely(nvmeq->cq_vector < 0)) {
+ ret = BLK_STS_IOERR;
+ spin_unlock_irq(&nvmeq->q_lock);
+ goto out_cleanup_iod;
+ }
+ __nvme_submit_cmd(nvmeq, &cmnd);
+ nvme_process_cq(nvmeq);
+ spin_unlock_irq(&nvmeq->q_lock);
+ return BLK_STS_OK;
+out_cleanup_iod:
+ nvme_free_iod(dev, req);
+out_free_cmd:
+ nvme_cleanup_cmd(req);
+ return ret;
+}
+
+static void nvme_pci_complete_rq(struct request *req)
+{
+ struct nvme_iod *iod = blk_mq_rq_to_pdu(req);
+
+ nvme_unmap_data(iod->nvmeq->dev, req);
+ nvme_complete_rq(req);
+}
+
+/* We read the CQE phase first to check if the rest of the entry is valid */
+static inline bool nvme_cqe_valid(struct nvme_queue *nvmeq, u16 head,
+ u16 phase)
+{
+ return (le16_to_cpu(nvmeq->cqes[head].status) & 1) == phase;
+}
+
+static inline void nvme_ring_cq_doorbell(struct nvme_queue *nvmeq)
+{
+ u16 head = nvmeq->cq_head;
+
+ if (likely(nvmeq->cq_vector >= 0)) {
+ if (nvme_dbbuf_update_and_check_event(head, nvmeq->dbbuf_cq_db,
+ nvmeq->dbbuf_cq_ei))
+ writel(head, nvmeq->q_db + nvmeq->dev->db_stride);
+ }
+}
+
+static inline void nvme_handle_cqe(struct nvme_queue *nvmeq,
+ struct nvme_completion *cqe)
+{
+ struct request *req;
+
+ if (unlikely(cqe->command_id >= nvmeq->q_depth)) {
+ dev_warn(nvmeq->dev->ctrl.device,
+ "invalid id %d completed on queue %d\n",
+ cqe->command_id, le16_to_cpu(cqe->sq_id));
+ return;
+ }
+
+ /*
+ * AEN requests are special as they don't time out and can
+ * survive any kind of queue freeze and often don't respond to
+ * aborts. We don't even bother to allocate a struct request
+ * for them but rather special case them here.
+ */
+ if (unlikely(nvmeq->qid == 0 &&
+ cqe->command_id >= NVME_AQ_BLKMQ_DEPTH)) {
+ nvme_complete_async_event(&nvmeq->dev->ctrl,
+ cqe->status, &cqe->result);
+ return;
+ }
+
+ nvmeq->cqe_seen = 1;
+ req = blk_mq_tag_to_rq(*nvmeq->tags, cqe->command_id);
+ nvme_end_request(req, cqe->status, cqe->result);
+}
+
+static inline bool nvme_read_cqe(struct nvme_queue *nvmeq,
+ struct nvme_completion *cqe)
+{
+ if (nvme_cqe_valid(nvmeq, nvmeq->cq_head, nvmeq->cq_phase)) {
+ *cqe = nvmeq->cqes[nvmeq->cq_head];
+
+ if (++nvmeq->cq_head == nvmeq->q_depth) {
+ nvmeq->cq_head = 0;
+ nvmeq->cq_phase = !nvmeq->cq_phase;
+ }
+ return true;
+ }
+ return false;
+}
+
+static void nvme_process_cq(struct nvme_queue *nvmeq)
+{
+ struct nvme_completion cqe;
+ int consumed = 0;
+
+ while (nvme_read_cqe(nvmeq, &cqe)) {
+ nvme_handle_cqe(nvmeq, &cqe);
+ consumed++;
+ }
+
+ if (consumed)
+ nvme_ring_cq_doorbell(nvmeq);
+}
+
+static irqreturn_t nvme_irq(int irq, void *data)
+{
+ irqreturn_t result;
+ struct nvme_queue *nvmeq = data;
+ spin_lock(&nvmeq->q_lock);
+ nvme_process_cq(nvmeq);
+ result = nvmeq->cqe_seen ? IRQ_HANDLED : IRQ_NONE;
+ nvmeq->cqe_seen = 0;
+ spin_unlock(&nvmeq->q_lock);
+ return result;
+}
+
+static irqreturn_t nvme_irq_check(int irq, void *data)
+{
+ struct nvme_queue *nvmeq = data;
+ if (nvme_cqe_valid(nvmeq, nvmeq->cq_head, nvmeq->cq_phase))
+ return IRQ_WAKE_THREAD;
+ return IRQ_NONE;
+}
+
+static int __nvme_poll(struct nvme_queue *nvmeq, unsigned int tag)
+{
+ struct nvme_completion cqe;
+ int found = 0, consumed = 0;
+
+ if (!nvme_cqe_valid(nvmeq, nvmeq->cq_head, nvmeq->cq_phase))
+ return 0;
+
+ spin_lock_irq(&nvmeq->q_lock);
+ while (nvme_read_cqe(nvmeq, &cqe)) {
+ nvme_handle_cqe(nvmeq, &cqe);
+ consumed++;
+
+ if (tag == cqe.command_id) {
+ found = 1;
+ break;
+ }
+ }
+
+ if (consumed)
+ nvme_ring_cq_doorbell(nvmeq);
+ spin_unlock_irq(&nvmeq->q_lock);
+
+ return found;
+}
+
+static int nvme_poll(struct blk_mq_hw_ctx *hctx, unsigned int tag)
+{
+ struct nvme_queue *nvmeq = hctx->driver_data;
+
+ return __nvme_poll(nvmeq, tag);
+}
+
+static void nvme_pci_submit_async_event(struct nvme_ctrl *ctrl, int aer_idx)
+{
+ struct nvme_dev *dev = to_nvme_dev(ctrl);
+ struct nvme_queue *nvmeq = &dev->queues[0];
+ struct nvme_command c;
+
+ memset(&c, 0, sizeof(c));
+ c.common.opcode = nvme_admin_async_event;
+ c.common.command_id = NVME_AQ_BLKMQ_DEPTH + aer_idx;
+
+ spin_lock_irq(&nvmeq->q_lock);
+ __nvme_submit_cmd(nvmeq, &c);
+ spin_unlock_irq(&nvmeq->q_lock);
+}
+
+static int adapter_delete_queue(struct nvme_dev *dev, u8 opcode, u16 id)
+{
+ struct nvme_command c;
+
+ memset(&c, 0, sizeof(c));
+ c.delete_queue.opcode = opcode;
+ c.delete_queue.qid = cpu_to_le16(id);
+
+ return nvme_submit_sync_cmd(dev->ctrl.admin_q, &c, NULL, 0);
+}
+
+static int adapter_alloc_cq(struct nvme_dev *dev, u16 qid,
+ struct nvme_queue *nvmeq)
+{
+ struct nvme_command c;
+ int flags = NVME_QUEUE_PHYS_CONTIG | NVME_CQ_IRQ_ENABLED;
+
+ /*
+ * Note: we (ab)use the fact the the prp fields survive if no data
+ * is attached to the request.
+ */
+ memset(&c, 0, sizeof(c));
+ c.create_cq.opcode = nvme_admin_create_cq;
+ c.create_cq.prp1 = cpu_to_le64(nvmeq->cq_dma_addr);
+ c.create_cq.cqid = cpu_to_le16(qid);
+ c.create_cq.qsize = cpu_to_le16(nvmeq->q_depth - 1);
+ c.create_cq.cq_flags = cpu_to_le16(flags);
+ c.create_cq.irq_vector = cpu_to_le16(nvmeq->cq_vector);
+
+ return nvme_submit_sync_cmd(dev->ctrl.admin_q, &c, NULL, 0);
+}
+
+static int adapter_alloc_sq(struct nvme_dev *dev, u16 qid,
+ struct nvme_queue *nvmeq)
+{
+ struct nvme_ctrl *ctrl = &dev->ctrl;
+ struct nvme_command c;
+ int flags = NVME_QUEUE_PHYS_CONTIG;
+
+ /*
+ * Some drives have a bug that auto-enables WRRU if MEDIUM isn't
+ * set. Since URGENT priority is zeroes, it makes all queues
+ * URGENT.
+ */
+ if (ctrl->quirks & NVME_QUIRK_MEDIUM_PRIO_SQ)
+ flags |= NVME_SQ_PRIO_MEDIUM;
+
+ /*
+ * Note: we (ab)use the fact the the prp fields survive if no data
+ * is attached to the request.
+ */
+ memset(&c, 0, sizeof(c));
+ c.create_sq.opcode = nvme_admin_create_sq;
+ c.create_sq.prp1 = cpu_to_le64(nvmeq->sq_dma_addr);
+ c.create_sq.sqid = cpu_to_le16(qid);
+ c.create_sq.qsize = cpu_to_le16(nvmeq->q_depth - 1);
+ c.create_sq.sq_flags = cpu_to_le16(flags);
+ c.create_sq.cqid = cpu_to_le16(qid);
+
+ return nvme_submit_sync_cmd(dev->ctrl.admin_q, &c, NULL, 0);
+}
+
+static int adapter_delete_cq(struct nvme_dev *dev, u16 cqid)
+{
+ return adapter_delete_queue(dev, nvme_admin_delete_cq, cqid);
+}
+
+static int adapter_delete_sq(struct nvme_dev *dev, u16 sqid)
+{
+ return adapter_delete_queue(dev, nvme_admin_delete_sq, sqid);
+}
+
+static void abort_endio(struct request *req, blk_status_t error)
+{
+ struct nvme_iod *iod = blk_mq_rq_to_pdu(req);
+ struct nvme_queue *nvmeq = iod->nvmeq;
+
+ dev_warn(nvmeq->dev->ctrl.device,
+ "Abort status: 0x%x", nvme_req(req)->status);
+ atomic_inc(&nvmeq->dev->ctrl.abort_limit);
+ blk_mq_free_request(req);
+}
+
+static bool nvme_should_reset(struct nvme_dev *dev, u32 csts)
+{
+
+ /* If true, indicates loss of adapter communication, possibly by a
+ * NVMe Subsystem reset.
+ */
+ bool nssro = dev->subsystem && (csts & NVME_CSTS_NSSRO);
+
+ /* If there is a reset ongoing, we shouldn't reset again. */
+ if (dev->ctrl.state == NVME_CTRL_RESETTING)
+ return false;
+
+ /* We shouldn't reset unless the controller is on fatal error state
+ * _or_ if we lost the communication with it.
+ */
+ if (!(csts & NVME_CSTS_CFS) && !nssro)
+ return false;
+
+ return true;
+}
+
+static void nvme_warn_reset(struct nvme_dev *dev, u32 csts)
+{
+ /* Read a config register to help see what died. */
+ u16 pci_status;
+ int result;
+
+ result = pci_read_config_word(to_pci_dev(dev->dev), PCI_STATUS,
+ &pci_status);
+ if (result == PCIBIOS_SUCCESSFUL)
+ dev_warn(dev->ctrl.device,
+ "controller is down; will reset: CSTS=0x%x, PCI_STATUS=0x%hx\n",
+ csts, pci_status);
+ else
+ dev_warn(dev->ctrl.device,
+ "controller is down; will reset: CSTS=0x%x, PCI_STATUS read failed (%d)\n",
+ csts, result);
+}
+
+static enum blk_eh_timer_return nvme_timeout(struct request *req, bool reserved)
+{
+ struct nvme_iod *iod = blk_mq_rq_to_pdu(req);
+ struct nvme_queue *nvmeq = iod->nvmeq;
+ struct nvme_dev *dev = nvmeq->dev;
+ struct request *abort_req;
+ struct nvme_command cmd;
+ u32 csts = readl(dev->bar + NVME_REG_CSTS);
+
+ /* If PCI error recovery process is happening, we cannot reset or
+ * the recovery mechanism will surely fail.
+ */
+ mb();
+ if (pci_channel_offline(to_pci_dev(dev->dev)))
+ return BLK_EH_RESET_TIMER;
+
+ /*
+ * Reset immediately if the controller is failed
+ */
+ if (nvme_should_reset(dev, csts)) {
+ nvme_warn_reset(dev, csts);
+ nvme_dev_disable(dev, false);
+ nvme_reset_ctrl(&dev->ctrl);
+ return BLK_EH_HANDLED;
+ }
+
+ /*
+ * Did we miss an interrupt?
+ */
+ if (__nvme_poll(nvmeq, req->tag)) {
+ dev_warn(dev->ctrl.device,
+ "I/O %d QID %d timeout, completion polled\n",
+ req->tag, nvmeq->qid);
+ return BLK_EH_HANDLED;
+ }
+
+ /*
+ * Shutdown immediately if controller times out while starting. The
+ * reset work will see the pci device disabled when it gets the forced
+ * cancellation error. All outstanding requests are completed on
+ * shutdown, so we return BLK_EH_HANDLED.
+ */
+ if (dev->ctrl.state == NVME_CTRL_RESETTING) {
+ dev_warn(dev->ctrl.device,
+ "I/O %d QID %d timeout, disable controller\n",
+ req->tag, nvmeq->qid);
+ nvme_dev_disable(dev, false);
+ nvme_req(req)->flags |= NVME_REQ_CANCELLED;
+ return BLK_EH_HANDLED;
+ }
+
+ /*
+ * Shutdown the controller immediately and schedule a reset if the
+ * command was already aborted once before and still hasn't been
+ * returned to the driver, or if this is the admin queue.
+ */
+ if (!nvmeq->qid || iod->aborted) {
+ dev_warn(dev->ctrl.device,
+ "I/O %d QID %d timeout, reset controller\n",
+ req->tag, nvmeq->qid);
+ nvme_dev_disable(dev, false);
+ nvme_reset_ctrl(&dev->ctrl);
+
+ /*
+ * Mark the request as handled, since the inline shutdown
+ * forces all outstanding requests to complete.
+ */
+ nvme_req(req)->flags |= NVME_REQ_CANCELLED;
+ return BLK_EH_HANDLED;
+ }
+
+ if (atomic_dec_return(&dev->ctrl.abort_limit) < 0) {
+ atomic_inc(&dev->ctrl.abort_limit);
+ return BLK_EH_RESET_TIMER;
+ }
+ iod->aborted = 1;
+
+ memset(&cmd, 0, sizeof(cmd));
+ cmd.abort.opcode = nvme_admin_abort_cmd;
+ cmd.abort.cid = req->tag;
+ cmd.abort.sqid = cpu_to_le16(nvmeq->qid);
+
+ dev_warn(nvmeq->dev->ctrl.device,
+ "I/O %d QID %d timeout, aborting\n",
+ req->tag, nvmeq->qid);
+
+ abort_req = nvme_alloc_request(dev->ctrl.admin_q, &cmd,
+ BLK_MQ_REQ_NOWAIT, NVME_QID_ANY);
+ if (IS_ERR(abort_req)) {
+ atomic_inc(&dev->ctrl.abort_limit);
+ return BLK_EH_RESET_TIMER;
+ }
+
+ abort_req->timeout = ADMIN_TIMEOUT;
+ abort_req->end_io_data = NULL;
+ blk_execute_rq_nowait(abort_req->q, NULL, abort_req, 0, abort_endio);
+
+ /*
+ * The aborted req will be completed on receiving the abort req.
+ * We enable the timer again. If hit twice, it'll cause a device reset,
+ * as the device then is in a faulty state.
+ */
+ return BLK_EH_RESET_TIMER;
+}
+
+static void nvme_free_queue(struct nvme_queue *nvmeq)
+{
+ dma_free_coherent(nvmeq->q_dmadev, CQ_SIZE(nvmeq->q_depth),
+ (void *)nvmeq->cqes, nvmeq->cq_dma_addr);
+ if (nvmeq->sq_cmds)
+ dma_free_coherent(nvmeq->q_dmadev, SQ_SIZE(nvmeq->q_depth),
+ nvmeq->sq_cmds, nvmeq->sq_dma_addr);
+}
+
+static void nvme_free_queues(struct nvme_dev *dev, int lowest)
+{
+ int i;
+
+ for (i = dev->ctrl.queue_count - 1; i >= lowest; i--) {
+ dev->ctrl.queue_count--;
+ nvme_free_queue(&dev->queues[i]);
+ }
+}
+
+/**
+ * nvme_suspend_queue - put queue into suspended state
+ * @nvmeq - queue to suspend
+ */
+static int nvme_suspend_queue(struct nvme_queue *nvmeq)
+{
+ int vector;
+
+ spin_lock_irq(&nvmeq->q_lock);
+ if (nvmeq->cq_vector == -1) {
+ spin_unlock_irq(&nvmeq->q_lock);
+ return 1;
+ }
+ vector = nvmeq->cq_vector;
+ nvmeq->dev->online_queues--;
+ nvmeq->cq_vector = -1;
+ spin_unlock_irq(&nvmeq->q_lock);
+
+ if (!nvmeq->qid && nvmeq->dev->ctrl.admin_q)
+ blk_mq_quiesce_queue(nvmeq->dev->ctrl.admin_q);
+
+ pci_free_irq(to_pci_dev(nvmeq->dev->dev), vector, nvmeq);
+
+ return 0;
+}
+
+static void nvme_disable_admin_queue(struct nvme_dev *dev, bool shutdown)
+{
+ struct nvme_queue *nvmeq = &dev->queues[0];
+
+ if (nvme_suspend_queue(nvmeq))
+ return;
+
+ if (shutdown)
+ nvme_shutdown_ctrl(&dev->ctrl);
+ else
+ nvme_disable_ctrl(&dev->ctrl, dev->ctrl.cap);
+
+ spin_lock_irq(&nvmeq->q_lock);
+ nvme_process_cq(nvmeq);
+ spin_unlock_irq(&nvmeq->q_lock);
+}
+
+static int nvme_cmb_qdepth(struct nvme_dev *dev, int nr_io_queues,
+ int entry_size)
+{
+ int q_depth = dev->q_depth;
+ unsigned q_size_aligned = roundup(q_depth * entry_size,
+ dev->ctrl.page_size);
+
+ if (q_size_aligned * nr_io_queues > dev->cmb_size) {
+ u64 mem_per_q = div_u64(dev->cmb_size, nr_io_queues);
+ mem_per_q = round_down(mem_per_q, dev->ctrl.page_size);
+ q_depth = div_u64(mem_per_q, entry_size);
+
+ /*
+ * Ensure the reduced q_depth is above some threshold where it
+ * would be better to map queues in system memory with the
+ * original depth
+ */
+ if (q_depth < 64)
+ return -ENOMEM;
+ }
+
+ return q_depth;
+}
+
+static int nvme_alloc_sq_cmds(struct nvme_dev *dev, struct nvme_queue *nvmeq,
+ int qid, int depth)
+{
+
+ /* CMB SQEs will be mapped before creation */
+ if (qid && dev->cmb && use_cmb_sqes && NVME_CMB_SQS(dev->cmbsz))
+ return 0;
+
+ nvmeq->sq_cmds = dma_alloc_coherent(dev->dev, SQ_SIZE(depth),
+ &nvmeq->sq_dma_addr, GFP_KERNEL);
+ if (!nvmeq->sq_cmds)
+ return -ENOMEM;
+
+ return 0;
+}
+
+static int nvme_alloc_queue(struct nvme_dev *dev, int qid,
+ int depth, int node)
+{
+ struct nvme_queue *nvmeq = &dev->queues[qid];
+
+ if (dev->ctrl.queue_count > qid)
+ return 0;
+
+ nvmeq->cqes = dma_zalloc_coherent(dev->dev, CQ_SIZE(depth),
+ &nvmeq->cq_dma_addr, GFP_KERNEL);
+ if (!nvmeq->cqes)
+ goto free_nvmeq;
+
+ if (nvme_alloc_sq_cmds(dev, nvmeq, qid, depth))
+ goto free_cqdma;
+
+ nvmeq->q_dmadev = dev->dev;
+ nvmeq->dev = dev;
+ spin_lock_init(&nvmeq->q_lock);
+ nvmeq->cq_head = 0;
+ nvmeq->cq_phase = 1;
+ nvmeq->q_db = &dev->dbs[qid * 2 * dev->db_stride];
+ nvmeq->q_depth = depth;
+ nvmeq->qid = qid;
+ nvmeq->cq_vector = -1;
+ dev->ctrl.queue_count++;
+
+ return 0;
+
+ free_cqdma:
+ dma_free_coherent(dev->dev, CQ_SIZE(depth), (void *)nvmeq->cqes,
+ nvmeq->cq_dma_addr);
+ free_nvmeq:
+ return -ENOMEM;
+}
+
+static int queue_request_irq(struct nvme_queue *nvmeq)
+{
+ struct pci_dev *pdev = to_pci_dev(nvmeq->dev->dev);
+ int nr = nvmeq->dev->ctrl.instance;
+
+ if (use_threaded_interrupts) {
+ return pci_request_irq(pdev, nvmeq->cq_vector, nvme_irq_check,
+ nvme_irq, nvmeq, "nvme%dq%d", nr, nvmeq->qid);
+ } else {
+ return pci_request_irq(pdev, nvmeq->cq_vector, nvme_irq,
+ NULL, nvmeq, "nvme%dq%d", nr, nvmeq->qid);
+ }
+}
+
+static void nvme_init_queue(struct nvme_queue *nvmeq, u16 qid)
+{
+ struct nvme_dev *dev = nvmeq->dev;
+
+ spin_lock_irq(&nvmeq->q_lock);
+ nvmeq->sq_tail = 0;
+ nvmeq->cq_head = 0;
+ nvmeq->cq_phase = 1;
+ nvmeq->q_db = &dev->dbs[qid * 2 * dev->db_stride];
+ memset((void *)nvmeq->cqes, 0, CQ_SIZE(nvmeq->q_depth));
+ nvme_dbbuf_init(dev, nvmeq, qid);
+ dev->online_queues++;
+ spin_unlock_irq(&nvmeq->q_lock);
+}
+
+static int nvme_create_queue(struct nvme_queue *nvmeq, int qid)
+{
+ struct nvme_dev *dev = nvmeq->dev;
+ int result;
+
+ if (qid && dev->cmb && use_cmb_sqes && NVME_CMB_SQS(dev->cmbsz)) {
+ unsigned offset = (qid - 1) * roundup(SQ_SIZE(nvmeq->q_depth),
+ dev->ctrl.page_size);
+ nvmeq->sq_dma_addr = dev->cmb_bus_addr + offset;
+ nvmeq->sq_cmds_io = dev->cmb + offset;
+ }
+
+ nvmeq->cq_vector = qid - 1;
+ result = adapter_alloc_cq(dev, qid, nvmeq);
+ if (result < 0)
+ goto release_vector;
+
+ result = adapter_alloc_sq(dev, qid, nvmeq);
+ if (result < 0)
+ goto release_cq;
+
+ nvme_init_queue(nvmeq, qid);
+ result = queue_request_irq(nvmeq);
+ if (result < 0)
+ goto release_sq;
+
+ return result;
+
+ release_sq:
+ dev->online_queues--;
+ adapter_delete_sq(dev, qid);
+ release_cq:
+ adapter_delete_cq(dev, qid);
+ release_vector:
+ nvmeq->cq_vector = -1;
+ return result;
+}
+
+static const struct blk_mq_ops nvme_mq_admin_ops = {
+ .queue_rq = nvme_queue_rq,
+ .complete = nvme_pci_complete_rq,
+ .init_hctx = nvme_admin_init_hctx,
+ .exit_hctx = nvme_admin_exit_hctx,
+ .init_request = nvme_init_request,
+ .timeout = nvme_timeout,
+};
+
+static const struct blk_mq_ops nvme_mq_ops = {
+ .queue_rq = nvme_queue_rq,
+ .complete = nvme_pci_complete_rq,
+ .init_hctx = nvme_init_hctx,
+ .init_request = nvme_init_request,
+ .map_queues = nvme_pci_map_queues,
+ .timeout = nvme_timeout,
+ .poll = nvme_poll,
+};
+
+static void nvme_dev_remove_admin(struct nvme_dev *dev)
+{
+ if (dev->ctrl.admin_q && !blk_queue_dying(dev->ctrl.admin_q)) {
+ /*
+ * If the controller was reset during removal, it's possible
+ * user requests may be waiting on a stopped queue. Start the
+ * queue to flush these to completion.
+ */
+ blk_mq_unquiesce_queue(dev->ctrl.admin_q);
+ blk_cleanup_queue(dev->ctrl.admin_q);
+ blk_mq_free_tag_set(&dev->admin_tagset);
+ }
+}
+
+static int nvme_alloc_admin_tags(struct nvme_dev *dev)
+{
+ if (!dev->ctrl.admin_q) {
+ dev->admin_tagset.ops = &nvme_mq_admin_ops;
+ dev->admin_tagset.nr_hw_queues = 1;
+
+ /*
+ * Subtract one to leave an empty queue entry for 'Full Queue'
+ * condition. See NVM-Express 1.2 specification, section 4.1.2.
+ */
+ dev->admin_tagset.queue_depth = NVME_AQ_BLKMQ_DEPTH - 1;
+ dev->admin_tagset.timeout = ADMIN_TIMEOUT;
+ dev->admin_tagset.numa_node = dev_to_node(dev->dev);
+ dev->admin_tagset.cmd_size = nvme_cmd_size(dev);
+ dev->admin_tagset.flags = BLK_MQ_F_NO_SCHED;
+ dev->admin_tagset.driver_data = dev;
+
+ if (blk_mq_alloc_tag_set(&dev->admin_tagset))
+ return -ENOMEM;
+ dev->ctrl.admin_tagset = &dev->admin_tagset;
+
+ dev->ctrl.admin_q = blk_mq_init_queue(&dev->admin_tagset);
+ if (IS_ERR(dev->ctrl.admin_q)) {
+ blk_mq_free_tag_set(&dev->admin_tagset);
+ return -ENOMEM;
+ }
+ if (!blk_get_queue(dev->ctrl.admin_q)) {
+ nvme_dev_remove_admin(dev);
+ dev->ctrl.admin_q = NULL;
+ return -ENODEV;
+ }
+ } else
+ blk_mq_unquiesce_queue(dev->ctrl.admin_q);
+
+ return 0;
+}
+
+static unsigned long db_bar_size(struct nvme_dev *dev, unsigned nr_io_queues)
+{
+ return NVME_REG_DBS + ((nr_io_queues + 1) * 8 * dev->db_stride);
+}
+
+static int nvme_remap_bar(struct nvme_dev *dev, unsigned long size)
+{
+ struct pci_dev *pdev = to_pci_dev(dev->dev);
+
+ if (size <= dev->bar_mapped_size)
+ return 0;
+ if (size > pci_resource_len(pdev, 0))
+ return -ENOMEM;
+ if (dev->bar)
+ iounmap(dev->bar);
+ dev->bar = ioremap(pci_resource_start(pdev, 0), size);
+ if (!dev->bar) {
+ dev->bar_mapped_size = 0;
+ return -ENOMEM;
+ }
+ dev->bar_mapped_size = size;
+ dev->dbs = dev->bar + NVME_REG_DBS;
+
+ return 0;
+}
+
+static int nvme_pci_configure_admin_queue(struct nvme_dev *dev)
+{
+ int result;
+ u32 aqa;
+ struct nvme_queue *nvmeq;
+
+ result = nvme_remap_bar(dev, db_bar_size(dev, 0));
+ if (result < 0)
+ return result;
+
+ dev->subsystem = readl(dev->bar + NVME_REG_VS) >= NVME_VS(1, 1, 0) ?
+ NVME_CAP_NSSRC(dev->ctrl.cap) : 0;
+
+ if (dev->subsystem &&
+ (readl(dev->bar + NVME_REG_CSTS) & NVME_CSTS_NSSRO))
+ writel(NVME_CSTS_NSSRO, dev->bar + NVME_REG_CSTS);
+
+ result = nvme_disable_ctrl(&dev->ctrl, dev->ctrl.cap);
+ if (result < 0)
+ return result;
+
+ result = nvme_alloc_queue(dev, 0, NVME_AQ_DEPTH,
+ dev_to_node(dev->dev));
+ if (result)
+ return result;
+
+ nvmeq = &dev->queues[0];
+ aqa = nvmeq->q_depth - 1;
+ aqa |= aqa << 16;
+
+ writel(aqa, dev->bar + NVME_REG_AQA);
+ lo_hi_writeq(nvmeq->sq_dma_addr, dev->bar + NVME_REG_ASQ);
+ lo_hi_writeq(nvmeq->cq_dma_addr, dev->bar + NVME_REG_ACQ);
+
+ result = nvme_enable_ctrl(&dev->ctrl, dev->ctrl.cap);
+ if (result)
+ return result;
+
+ nvmeq->cq_vector = 0;
+ nvme_init_queue(nvmeq, 0);
+ result = queue_request_irq(nvmeq);
+ if (result) {
+ nvmeq->cq_vector = -1;
+ return result;
+ }
+
+ return result;
+}
+
+static int nvme_create_io_queues(struct nvme_dev *dev)
+{
+ unsigned i, max;
+ int ret = 0;
+
+ for (i = dev->ctrl.queue_count; i <= dev->max_qid; i++) {
+ /* vector == qid - 1, match nvme_create_queue */
+ if (nvme_alloc_queue(dev, i, dev->q_depth,
+ pci_irq_get_node(to_pci_dev(dev->dev), i - 1))) {
+ ret = -ENOMEM;
+ break;
+ }
+ }
+
+ max = min(dev->max_qid, dev->ctrl.queue_count - 1);
+ for (i = dev->online_queues; i <= max; i++) {
+ ret = nvme_create_queue(&dev->queues[i], i);
+ if (ret)
+ break;
+ }
+
+ /*
+ * Ignore failing Create SQ/CQ commands, we can continue with less
+ * than the desired aount of queues, and even a controller without
+ * I/O queues an still be used to issue admin commands. This might
+ * be useful to upgrade a buggy firmware for example.
+ */
+ return ret >= 0 ? 0 : ret;
+}
+
+static ssize_t nvme_cmb_show(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct nvme_dev *ndev = to_nvme_dev(dev_get_drvdata(dev));
+
+ return scnprintf(buf, PAGE_SIZE, "cmbloc : x%08x\ncmbsz : x%08x\n",
+ ndev->cmbloc, ndev->cmbsz);
+}
+static DEVICE_ATTR(cmb, S_IRUGO, nvme_cmb_show, NULL);
+
+static void __iomem *nvme_map_cmb(struct nvme_dev *dev)
+{
+ u64 szu, size, offset;
+ resource_size_t bar_size;
+ struct pci_dev *pdev = to_pci_dev(dev->dev);
+ void __iomem *cmb;
+ int bar;
+
+ dev->cmbsz = readl(dev->bar + NVME_REG_CMBSZ);
+ if (!(NVME_CMB_SZ(dev->cmbsz)))
+ return NULL;
+ dev->cmbloc = readl(dev->bar + NVME_REG_CMBLOC);
+
+ if (!use_cmb_sqes)
+ return NULL;
+
+ szu = (u64)1 << (12 + 4 * NVME_CMB_SZU(dev->cmbsz));
+ size = szu * NVME_CMB_SZ(dev->cmbsz);
+ offset = szu * NVME_CMB_OFST(dev->cmbloc);
+ bar = NVME_CMB_BIR(dev->cmbloc);
+ bar_size = pci_resource_len(pdev, bar);
+
+ if (offset > bar_size)
+ return NULL;
+
+ /*
+ * Controllers may support a CMB size larger than their BAR,
+ * for example, due to being behind a bridge. Reduce the CMB to
+ * the reported size of the BAR
+ */
+ if (size > bar_size - offset)
+ size = bar_size - offset;
+
+ cmb = ioremap_wc(pci_resource_start(pdev, bar) + offset, size);
+ if (!cmb)
+ return NULL;
+
+ dev->cmb_bus_addr = pci_bus_address(pdev, bar) + offset;
+ dev->cmb_size = size;
+ return cmb;
+}
+
+static inline void nvme_release_cmb(struct nvme_dev *dev)
+{
+ if (dev->cmb) {
+ iounmap(dev->cmb);
+ dev->cmb = NULL;
+ sysfs_remove_file_from_group(&dev->ctrl.device->kobj,
+ &dev_attr_cmb.attr, NULL);
+ dev->cmbsz = 0;
+ }
+}
+
+static int nvme_set_host_mem(struct nvme_dev *dev, u32 bits)
+{
+ u64 dma_addr = dev->host_mem_descs_dma;
+ struct nvme_command c;
+ int ret;
+
+ memset(&c, 0, sizeof(c));
+ c.features.opcode = nvme_admin_set_features;
+ c.features.fid = cpu_to_le32(NVME_FEAT_HOST_MEM_BUF);
+ c.features.dword11 = cpu_to_le32(bits);
+ c.features.dword12 = cpu_to_le32(dev->host_mem_size >>
+ ilog2(dev->ctrl.page_size));
+ c.features.dword13 = cpu_to_le32(lower_32_bits(dma_addr));
+ c.features.dword14 = cpu_to_le32(upper_32_bits(dma_addr));
+ c.features.dword15 = cpu_to_le32(dev->nr_host_mem_descs);
+
+ ret = nvme_submit_sync_cmd(dev->ctrl.admin_q, &c, NULL, 0);
+ if (ret) {
+ dev_warn(dev->ctrl.device,
+ "failed to set host mem (err %d, flags %#x).\n",
+ ret, bits);
+ }
+ return ret;
+}
+
+static void nvme_free_host_mem(struct nvme_dev *dev)
+{
+ int i;
+
+ for (i = 0; i < dev->nr_host_mem_descs; i++) {
+ struct nvme_host_mem_buf_desc *desc = &dev->host_mem_descs[i];
+ size_t size = le32_to_cpu(desc->size) * dev->ctrl.page_size;
+
+ dma_free_attrs(dev->dev, size, dev->host_mem_desc_bufs[i],
+ le64_to_cpu(desc->addr),
+ DMA_ATTR_NO_KERNEL_MAPPING | DMA_ATTR_NO_WARN);
+ }
+
+ kfree(dev->host_mem_desc_bufs);
+ dev->host_mem_desc_bufs = NULL;
+ dma_free_coherent(dev->dev,
+ dev->nr_host_mem_descs * sizeof(*dev->host_mem_descs),
+ dev->host_mem_descs, dev->host_mem_descs_dma);
+ dev->host_mem_descs = NULL;
+ dev->nr_host_mem_descs = 0;
+}
+
+static int __nvme_alloc_host_mem(struct nvme_dev *dev, u64 preferred,
+ u32 chunk_size)
+{
+ struct nvme_host_mem_buf_desc *descs;
+ u32 max_entries, len;
+ dma_addr_t descs_dma;
+ int i = 0;
+ void **bufs;
+ u64 size = 0, tmp;
+
+ tmp = (preferred + chunk_size - 1);
+ do_div(tmp, chunk_size);
+ max_entries = tmp;
+
+ if (dev->ctrl.hmmaxd && dev->ctrl.hmmaxd < max_entries)
+ max_entries = dev->ctrl.hmmaxd;
+
+ descs = dma_zalloc_coherent(dev->dev, max_entries * sizeof(*descs),
+ &descs_dma, GFP_KERNEL);
+ if (!descs)
+ goto out;
+
+ bufs = kcalloc(max_entries, sizeof(*bufs), GFP_KERNEL);
+ if (!bufs)
+ goto out_free_descs;
+
+ for (size = 0; size < preferred && i < max_entries; size += len) {
+ dma_addr_t dma_addr;
+
+ len = min_t(u64, chunk_size, preferred - size);
+ bufs[i] = dma_alloc_attrs(dev->dev, len, &dma_addr, GFP_KERNEL,
+ DMA_ATTR_NO_KERNEL_MAPPING | DMA_ATTR_NO_WARN);
+ if (!bufs[i])
+ break;
+
+ descs[i].addr = cpu_to_le64(dma_addr);
+ descs[i].size = cpu_to_le32(len / dev->ctrl.page_size);
+ i++;
+ }
+
+ if (!size)
+ goto out_free_bufs;
+
+ dev->nr_host_mem_descs = i;
+ dev->host_mem_size = size;
+ dev->host_mem_descs = descs;
+ dev->host_mem_descs_dma = descs_dma;
+ dev->host_mem_desc_bufs = bufs;
+ return 0;
+
+out_free_bufs:
+ while (--i >= 0) {
+ size_t size = le32_to_cpu(descs[i].size) * dev->ctrl.page_size;
+
+ dma_free_attrs(dev->dev, size, bufs[i],
+ le64_to_cpu(descs[i].addr),
+ DMA_ATTR_NO_KERNEL_MAPPING | DMA_ATTR_NO_WARN);
+ }
+
+ kfree(bufs);
+out_free_descs:
+ dma_free_coherent(dev->dev, max_entries * sizeof(*descs), descs,
+ descs_dma);
+out:
+ dev->host_mem_descs = NULL;
+ return -ENOMEM;
+}
+
+static int nvme_alloc_host_mem(struct nvme_dev *dev, u64 min, u64 preferred)
+{
+ u32 chunk_size;
+
+ /* start big and work our way down */
+ for (chunk_size = min_t(u64, preferred, PAGE_SIZE * MAX_ORDER_NR_PAGES);
+ chunk_size >= max_t(u32, dev->ctrl.hmminds * 4096, PAGE_SIZE * 2);
+ chunk_size /= 2) {
+ if (!__nvme_alloc_host_mem(dev, preferred, chunk_size)) {
+ if (!min || dev->host_mem_size >= min)
+ return 0;
+ nvme_free_host_mem(dev);
+ }
+ }
+
+ return -ENOMEM;
+}
+
+static int nvme_setup_host_mem(struct nvme_dev *dev)
+{
+ u64 max = (u64)max_host_mem_size_mb * SZ_1M;
+ u64 preferred = (u64)dev->ctrl.hmpre * 4096;
+ u64 min = (u64)dev->ctrl.hmmin * 4096;
+ u32 enable_bits = NVME_HOST_MEM_ENABLE;
+ int ret = 0;
+
+ preferred = min(preferred, max);
+ if (min > max) {
+ dev_warn(dev->ctrl.device,
+ "min host memory (%lld MiB) above limit (%d MiB).\n",
+ min >> ilog2(SZ_1M), max_host_mem_size_mb);
+ nvme_free_host_mem(dev);
+ return 0;
+ }
+
+ /*
+ * If we already have a buffer allocated check if we can reuse it.
+ */
+ if (dev->host_mem_descs) {
+ if (dev->host_mem_size >= min)
+ enable_bits |= NVME_HOST_MEM_RETURN;
+ else
+ nvme_free_host_mem(dev);
+ }
+
+ if (!dev->host_mem_descs) {
+ if (nvme_alloc_host_mem(dev, min, preferred)) {
+ dev_warn(dev->ctrl.device,
+ "failed to allocate host memory buffer.\n");
+ return 0; /* controller must work without HMB */
+ }
+
+ dev_info(dev->ctrl.device,
+ "allocated %lld MiB host memory buffer.\n",
+ dev->host_mem_size >> ilog2(SZ_1M));
+ }
+
+ ret = nvme_set_host_mem(dev, enable_bits);
+ if (ret)
+ nvme_free_host_mem(dev);
+ return ret;
+}
+
+static int nvme_setup_io_queues(struct nvme_dev *dev)
+{
+ struct nvme_queue *adminq = &dev->queues[0];
+ struct pci_dev *pdev = to_pci_dev(dev->dev);
+ int result, nr_io_queues;
+ unsigned long size;
+
+ nr_io_queues = num_possible_cpus();
+ result = nvme_set_queue_count(&dev->ctrl, &nr_io_queues);
+ if (result < 0)
+ return result;
+
+ if (nr_io_queues == 0)
+ return 0;
+
+ if (dev->cmb && NVME_CMB_SQS(dev->cmbsz)) {
+ result = nvme_cmb_qdepth(dev, nr_io_queues,
+ sizeof(struct nvme_command));
+ if (result > 0)
+ dev->q_depth = result;
+ else
+ nvme_release_cmb(dev);
+ }
+
+ do {
+ size = db_bar_size(dev, nr_io_queues);
+ result = nvme_remap_bar(dev, size);
+ if (!result)
+ break;
+ if (!--nr_io_queues)
+ return -ENOMEM;
+ } while (1);
+ adminq->q_db = dev->dbs;
+
+ /* Deregister the admin queue's interrupt */
+ pci_free_irq(pdev, 0, adminq);
+
+ /*
+ * If we enable msix early due to not intx, disable it again before
+ * setting up the full range we need.
+ */
+ pci_free_irq_vectors(pdev);
+ nr_io_queues = pci_alloc_irq_vectors(pdev, 1, nr_io_queues,
+ PCI_IRQ_ALL_TYPES | PCI_IRQ_AFFINITY);
+ if (nr_io_queues <= 0)
+ return -EIO;
+ dev->max_qid = nr_io_queues;
+
+ /*
+ * Should investigate if there's a performance win from allocating
+ * more queues than interrupt vectors; it might allow the submission
+ * path to scale better, even if the receive path is limited by the
+ * number of interrupts.
+ */
+
+ result = queue_request_irq(adminq);
+ if (result) {
+ adminq->cq_vector = -1;
+ return result;
+ }
+ return nvme_create_io_queues(dev);
+}
+
+static void nvme_del_queue_end(struct request *req, blk_status_t error)
+{
+ struct nvme_queue *nvmeq = req->end_io_data;
+
+ blk_mq_free_request(req);
+ complete(&nvmeq->dev->ioq_wait);
+}
+
+static void nvme_del_cq_end(struct request *req, blk_status_t error)
+{
+ struct nvme_queue *nvmeq = req->end_io_data;
+
+ if (!error) {
+ unsigned long flags;
+
+ /*
+ * We might be called with the AQ q_lock held
+ * and the I/O queue q_lock should always
+ * nest inside the AQ one.
+ */
+ spin_lock_irqsave_nested(&nvmeq->q_lock, flags,
+ SINGLE_DEPTH_NESTING);
+ nvme_process_cq(nvmeq);
+ spin_unlock_irqrestore(&nvmeq->q_lock, flags);
+ }
+
+ nvme_del_queue_end(req, error);
+}
+
+static int nvme_delete_queue(struct nvme_queue *nvmeq, u8 opcode)
+{
+ struct request_queue *q = nvmeq->dev->ctrl.admin_q;
+ struct request *req;
+ struct nvme_command cmd;
+
+ memset(&cmd, 0, sizeof(cmd));
+ cmd.delete_queue.opcode = opcode;
+ cmd.delete_queue.qid = cpu_to_le16(nvmeq->qid);
+
+ req = nvme_alloc_request(q, &cmd, BLK_MQ_REQ_NOWAIT, NVME_QID_ANY);
+ if (IS_ERR(req))
+ return PTR_ERR(req);
+
+ req->timeout = ADMIN_TIMEOUT;
+ req->end_io_data = nvmeq;
+
+ blk_execute_rq_nowait(q, NULL, req, false,
+ opcode == nvme_admin_delete_cq ?
+ nvme_del_cq_end : nvme_del_queue_end);
+ return 0;
+}
+
+static void nvme_disable_io_queues(struct nvme_dev *dev, int queues)
+{
+ int pass;
+ unsigned long timeout;
+ u8 opcode = nvme_admin_delete_sq;
+
+ for (pass = 0; pass < 2; pass++) {
+ int sent = 0, i = queues;
+
+ reinit_completion(&dev->ioq_wait);
+ retry:
+ timeout = ADMIN_TIMEOUT;
+ for (; i > 0; i--, sent++)
+ if (nvme_delete_queue(&dev->queues[i], opcode))
+ break;
+
+ while (sent--) {
+ timeout = wait_for_completion_io_timeout(&dev->ioq_wait, timeout);
+ if (timeout == 0)
+ return;
+ if (i)
+ goto retry;
+ }
+ opcode = nvme_admin_delete_cq;
+ }
+}
+
+/*
+ * Return: error value if an error occurred setting up the queues or calling
+ * Identify Device. 0 if these succeeded, even if adding some of the
+ * namespaces failed. At the moment, these failures are silent. TBD which
+ * failures should be reported.
+ */
+static int nvme_dev_add(struct nvme_dev *dev)
+{
+ if (!dev->ctrl.tagset) {
+ dev->tagset.ops = &nvme_mq_ops;
+ dev->tagset.nr_hw_queues = dev->online_queues - 1;
+ dev->tagset.timeout = NVME_IO_TIMEOUT;
+ dev->tagset.numa_node = dev_to_node(dev->dev);
+ dev->tagset.queue_depth =
+ min_t(int, dev->q_depth, BLK_MQ_MAX_DEPTH) - 1;
+ dev->tagset.cmd_size = nvme_cmd_size(dev);
+ dev->tagset.flags = BLK_MQ_F_SHOULD_MERGE;
+ dev->tagset.driver_data = dev;
+
+ if (blk_mq_alloc_tag_set(&dev->tagset))
+ return 0;
+ dev->ctrl.tagset = &dev->tagset;
+
+ nvme_dbbuf_set(dev);
+ } else {
+ blk_mq_update_nr_hw_queues(&dev->tagset, dev->online_queues - 1);
+
+ /* Free previously allocated queues that are no longer usable */
+ nvme_free_queues(dev, dev->online_queues);
+ }
+
+ return 0;
+}
+
+static int nvme_pci_enable(struct nvme_dev *dev)
+{
+ int result = -ENOMEM;
+ struct pci_dev *pdev = to_pci_dev(dev->dev);
+
+ if (pci_enable_device_mem(pdev))
+ return result;
+
+ pci_set_master(pdev);
+
+ if (dma_set_mask_and_coherent(dev->dev, DMA_BIT_MASK(64)) &&
+ dma_set_mask_and_coherent(dev->dev, DMA_BIT_MASK(32)))
+ goto disable;
+
+ if (readl(dev->bar + NVME_REG_CSTS) == -1) {
+ result = -ENODEV;
+ goto disable;
+ }
+
+ /*
+ * Some devices and/or platforms don't advertise or work with INTx
+ * interrupts. Pre-enable a single MSIX or MSI vec for setup. We'll
+ * adjust this later.
+ */
+ result = pci_alloc_irq_vectors(pdev, 1, 1, PCI_IRQ_ALL_TYPES);
+ if (result < 0)
+ return result;
+
+ dev->ctrl.cap = lo_hi_readq(dev->bar + NVME_REG_CAP);
+
+ dev->q_depth = min_t(int, NVME_CAP_MQES(dev->ctrl.cap) + 1,
+ io_queue_depth);
+ dev->db_stride = 1 << NVME_CAP_STRIDE(dev->ctrl.cap);
+ dev->dbs = dev->bar + 4096;
+
+ /*
+ * Temporary fix for the Apple controller found in the MacBook8,1 and
+ * some MacBook7,1 to avoid controller resets and data loss.
+ */
+ if (pdev->vendor == PCI_VENDOR_ID_APPLE && pdev->device == 0x2001) {
+ dev->q_depth = 2;
+ dev_warn(dev->ctrl.device, "detected Apple NVMe controller, "
+ "set queue depth=%u to work around controller resets\n",
+ dev->q_depth);
+ } else if (pdev->vendor == PCI_VENDOR_ID_SAMSUNG &&
+ (pdev->device == 0xa821 || pdev->device == 0xa822) &&
+ NVME_CAP_MQES(dev->ctrl.cap) == 0) {
+ dev->q_depth = 64;
+ dev_err(dev->ctrl.device, "detected PM1725 NVMe controller, "
+ "set queue depth=%u\n", dev->q_depth);
+ }
+
+ /*
+ * CMBs can currently only exist on >=1.2 PCIe devices. We only
+ * populate sysfs if a CMB is implemented. Since nvme_dev_attrs_group
+ * has no name we can pass NULL as final argument to
+ * sysfs_add_file_to_group.
+ */
+
+ if (readl(dev->bar + NVME_REG_VS) >= NVME_VS(1, 2, 0)) {
+ dev->cmb = nvme_map_cmb(dev);
+ if (dev->cmb) {
+ if (sysfs_add_file_to_group(&dev->ctrl.device->kobj,
+ &dev_attr_cmb.attr, NULL))
+ dev_warn(dev->ctrl.device,
+ "failed to add sysfs attribute for CMB\n");
+ }
+ }
+
+ pci_enable_pcie_error_reporting(pdev);
+ pci_save_state(pdev);
+ return 0;
+
+ disable:
+ pci_disable_device(pdev);
+ return result;
+}
+
+static void nvme_dev_unmap(struct nvme_dev *dev)
+{
+ if (dev->bar)
+ iounmap(dev->bar);
+ pci_release_mem_regions(to_pci_dev(dev->dev));
+}
+
+static void nvme_pci_disable(struct nvme_dev *dev)
+{
+ struct pci_dev *pdev = to_pci_dev(dev->dev);
+
+ nvme_release_cmb(dev);
+ pci_free_irq_vectors(pdev);
+
+ if (pci_is_enabled(pdev)) {
+ pci_disable_pcie_error_reporting(pdev);
+ pci_disable_device(pdev);
+ }
+}
+
+static void nvme_dev_disable(struct nvme_dev *dev, bool shutdown)
+{
+ int i, queues;
+ bool dead = true;
+ struct pci_dev *pdev = to_pci_dev(dev->dev);
+
+ mutex_lock(&dev->shutdown_lock);
+ if (pci_is_enabled(pdev)) {
+ u32 csts = readl(dev->bar + NVME_REG_CSTS);
+
+ if (dev->ctrl.state == NVME_CTRL_LIVE ||
+ dev->ctrl.state == NVME_CTRL_RESETTING)
+ nvme_start_freeze(&dev->ctrl);
+ dead = !!((csts & NVME_CSTS_CFS) || !(csts & NVME_CSTS_RDY) ||
+ pdev->error_state != pci_channel_io_normal);
+ }
+
+ /*
+ * Give the controller a chance to complete all entered requests if
+ * doing a safe shutdown.
+ */
+ if (!dead) {
+ if (shutdown)
+ nvme_wait_freeze_timeout(&dev->ctrl, NVME_IO_TIMEOUT);
+
+ /*
+ * If the controller is still alive tell it to stop using the
+ * host memory buffer. In theory the shutdown / reset should
+ * make sure that it doesn't access the host memoery anymore,
+ * but I'd rather be safe than sorry..
+ */
+ if (dev->host_mem_descs)
+ nvme_set_host_mem(dev, 0);
+
+ }
+ nvme_stop_queues(&dev->ctrl);
+
+ queues = dev->online_queues - 1;
+ for (i = dev->ctrl.queue_count - 1; i > 0; i--)
+ nvme_suspend_queue(&dev->queues[i]);
+
+ if (dead) {
+ /* A device might become IO incapable very soon during
+ * probe, before the admin queue is configured. Thus,
+ * queue_count can be 0 here.
+ */
+ if (dev->ctrl.queue_count)
+ nvme_suspend_queue(&dev->queues[0]);
+ } else {
+ nvme_disable_io_queues(dev, queues);
+ nvme_disable_admin_queue(dev, shutdown);
+ }
+ nvme_pci_disable(dev);
+
+ blk_mq_tagset_busy_iter(&dev->tagset, nvme_cancel_request, &dev->ctrl);
+ blk_mq_tagset_busy_iter(&dev->admin_tagset, nvme_cancel_request, &dev->ctrl);
+
+ /*
+ * The driver will not be starting up queues again if shutting down so
+ * must flush all entered requests to their failed completion to avoid
+ * deadlocking blk-mq hot-cpu notifier.
+ */
+ if (shutdown) {
+ nvme_start_queues(&dev->ctrl);
+ if (dev->ctrl.admin_q && !blk_queue_dying(dev->ctrl.admin_q))
+ blk_mq_unquiesce_queue(dev->ctrl.admin_q);
+ }
+ mutex_unlock(&dev->shutdown_lock);
+}
+
+static int nvme_setup_prp_pools(struct nvme_dev *dev)
+{
+ dev->prp_page_pool = dma_pool_create("prp list page", dev->dev,
+ PAGE_SIZE, PAGE_SIZE, 0);
+ if (!dev->prp_page_pool)
+ return -ENOMEM;
+
+ /* Optimisation for I/Os between 4k and 128k */
+ dev->prp_small_pool = dma_pool_create("prp list 256", dev->dev,
+ 256, 256, 0);
+ if (!dev->prp_small_pool) {
+ dma_pool_destroy(dev->prp_page_pool);
+ return -ENOMEM;
+ }
+ return 0;
+}
+
+static void nvme_release_prp_pools(struct nvme_dev *dev)
+{
+ dma_pool_destroy(dev->prp_page_pool);
+ dma_pool_destroy(dev->prp_small_pool);
+}
+
+static void nvme_pci_free_ctrl(struct nvme_ctrl *ctrl)
+{
+ struct nvme_dev *dev = to_nvme_dev(ctrl);
+
+ nvme_dbbuf_dma_free(dev);
+ put_device(dev->dev);
+ if (dev->tagset.tags)
+ blk_mq_free_tag_set(&dev->tagset);
+ if (dev->ctrl.admin_q)
+ blk_put_queue(dev->ctrl.admin_q);
+ kfree(dev->queues);
+ free_opal_dev(dev->ctrl.opal_dev);
+ kfree(dev);
+}
+
+static void nvme_remove_dead_ctrl(struct nvme_dev *dev, int status)
+{
+ dev_warn(dev->ctrl.device, "Removing after probe failure status: %d\n", status);
+
+ kref_get(&dev->ctrl.kref);
+ nvme_dev_disable(dev, false);
+ if (!schedule_work(&dev->remove_work))
+ nvme_put_ctrl(&dev->ctrl);
+}
+
+static void nvme_reset_work(struct work_struct *work)
+{
+ struct nvme_dev *dev =
+ container_of(work, struct nvme_dev, ctrl.reset_work);
+ bool was_suspend = !!(dev->ctrl.ctrl_config & NVME_CC_SHN_NORMAL);
+ int result = -ENODEV;
+
+ if (WARN_ON(dev->ctrl.state != NVME_CTRL_RESETTING))
+ goto out;
+
+ /*
+ * If we're called to reset a live controller first shut it down before
+ * moving on.
+ */
+ if (dev->ctrl.ctrl_config & NVME_CC_ENABLE)
+ nvme_dev_disable(dev, false);
+
+ result = nvme_pci_enable(dev);
+ if (result)
+ goto out;
+
+ result = nvme_pci_configure_admin_queue(dev);
+ if (result)
+ goto out;
+
+ result = nvme_alloc_admin_tags(dev);
+ if (result)
+ goto out;
+
+ result = nvme_init_identify(&dev->ctrl);
+ if (result)
+ goto out;
+
+ if (dev->ctrl.oacs & NVME_CTRL_OACS_SEC_SUPP) {
+ if (!dev->ctrl.opal_dev)
+ dev->ctrl.opal_dev =
+ init_opal_dev(&dev->ctrl, &nvme_sec_submit);
+ else if (was_suspend)
+ opal_unlock_from_suspend(dev->ctrl.opal_dev);
+ } else {
+ free_opal_dev(dev->ctrl.opal_dev);
+ dev->ctrl.opal_dev = NULL;
+ }
+
+ if (dev->ctrl.oacs & NVME_CTRL_OACS_DBBUF_SUPP) {
+ result = nvme_dbbuf_dma_alloc(dev);
+ if (result)
+ dev_warn(dev->dev,
+ "unable to allocate dma for dbbuf\n");
+ }
+
+ if (dev->ctrl.hmpre) {
+ result = nvme_setup_host_mem(dev);
+ if (result < 0)
+ goto out;
+ }
+
+ result = nvme_setup_io_queues(dev);
+ if (result)
+ goto out;
+
+ /*
+ * Keep the controller around but remove all namespaces if we don't have
+ * any working I/O queue.
+ */
+ if (dev->online_queues < 2) {
+ dev_warn(dev->ctrl.device, "IO queues not created\n");
+ nvme_kill_queues(&dev->ctrl);
+ nvme_remove_namespaces(&dev->ctrl);
+ } else {
+ nvme_start_queues(&dev->ctrl);
+ nvme_wait_freeze(&dev->ctrl);
+ nvme_dev_add(dev);
+ nvme_unfreeze(&dev->ctrl);
+ }
+
+ if (!nvme_change_ctrl_state(&dev->ctrl, NVME_CTRL_LIVE)) {
+ dev_warn(dev->ctrl.device, "failed to mark controller live\n");
+ goto out;
+ }
+
+ nvme_start_ctrl(&dev->ctrl);
+ return;
+
+ out:
+ nvme_remove_dead_ctrl(dev, result);
+}
+
+static void nvme_remove_dead_ctrl_work(struct work_struct *work)
+{
+ struct nvme_dev *dev = container_of(work, struct nvme_dev, remove_work);
+ struct pci_dev *pdev = to_pci_dev(dev->dev);
+
+ nvme_kill_queues(&dev->ctrl);
+ if (pci_get_drvdata(pdev))
+ device_release_driver(&pdev->dev);
+ nvme_put_ctrl(&dev->ctrl);
+}
+
+static int nvme_pci_reg_read32(struct nvme_ctrl *ctrl, u32 off, u32 *val)
+{
+ *val = readl(to_nvme_dev(ctrl)->bar + off);
+ return 0;
+}
+
+static int nvme_pci_reg_write32(struct nvme_ctrl *ctrl, u32 off, u32 val)
+{
+ writel(val, to_nvme_dev(ctrl)->bar + off);
+ return 0;
+}
+
+static int nvme_pci_reg_read64(struct nvme_ctrl *ctrl, u32 off, u64 *val)
+{
+ *val = lo_hi_readq(to_nvme_dev(ctrl)->bar + off);
+ return 0;
+}
+
+static const struct nvme_ctrl_ops nvme_pci_ctrl_ops = {
+ .name = "pcie",
+ .module = THIS_MODULE,
+ .flags = NVME_F_METADATA_SUPPORTED,
+ .reg_read32 = nvme_pci_reg_read32,
+ .reg_write32 = nvme_pci_reg_write32,
+ .reg_read64 = nvme_pci_reg_read64,
+ .free_ctrl = nvme_pci_free_ctrl,
+ .submit_async_event = nvme_pci_submit_async_event,
+};
+
+static int nvme_dev_map(struct nvme_dev *dev)
+{
+ struct pci_dev *pdev = to_pci_dev(dev->dev);
+
+ if (pci_request_mem_regions(pdev, "nvme"))
+ return -ENODEV;
+
+ if (nvme_remap_bar(dev, NVME_REG_DBS + 4096))
+ goto release;
+
+ return 0;
+ release:
+ pci_release_mem_regions(pdev);
+ return -ENODEV;
+}
+
+static unsigned long check_vendor_combination_bug(struct pci_dev *pdev)
+{
+ if (pdev->vendor == 0x144d && pdev->device == 0xa802) {
+ /*
+ * Several Samsung devices seem to drop off the PCIe bus
+ * randomly when APST is on and uses the deepest sleep state.
+ * This has been observed on a Samsung "SM951 NVMe SAMSUNG
+ * 256GB", a "PM951 NVMe SAMSUNG 512GB", and a "Samsung SSD
+ * 950 PRO 256GB", but it seems to be restricted to two Dell
+ * laptops.
+ */
+ if (dmi_match(DMI_SYS_VENDOR, "Dell Inc.") &&
+ (dmi_match(DMI_PRODUCT_NAME, "XPS 15 9550") ||
+ dmi_match(DMI_PRODUCT_NAME, "Precision 5510")))
+ return NVME_QUIRK_NO_DEEPEST_PS;
+ } else if (pdev->vendor == 0x144d && pdev->device == 0xa804) {
+ /*
+ * Samsung SSD 960 EVO drops off the PCIe bus after system
+ * suspend on a Ryzen board, ASUS PRIME B350M-A, as well as
+ * within few minutes after bootup on a Coffee Lake board -
+ * ASUS PRIME Z370-A
+ */
+ if (dmi_match(DMI_BOARD_VENDOR, "ASUSTeK COMPUTER INC.") &&
+ (dmi_match(DMI_BOARD_NAME, "PRIME B350M-A") ||
+ dmi_match(DMI_BOARD_NAME, "PRIME Z370-A")))
+ return NVME_QUIRK_NO_APST;
+ }
+
+ return 0;
+}
+
+static int nvme_probe(struct pci_dev *pdev, const struct pci_device_id *id)
+{
+ int node, result = -ENOMEM;
+ struct nvme_dev *dev;
+ unsigned long quirks = id->driver_data;
+
+ node = dev_to_node(&pdev->dev);
+ if (node == NUMA_NO_NODE)
+ set_dev_node(&pdev->dev, first_memory_node);
+
+ dev = kzalloc_node(sizeof(*dev), GFP_KERNEL, node);
+ if (!dev)
+ return -ENOMEM;
+
+ dev->queues = kzalloc_node((num_possible_cpus() + 1) * sizeof(struct nvme_queue),
+ GFP_KERNEL, node);
+ if (!dev->queues)
+ goto free;
+
+ dev->dev = get_device(&pdev->dev);
+ pci_set_drvdata(pdev, dev);
+
+ result = nvme_dev_map(dev);
+ if (result)
+ goto put_pci;
+
+ INIT_WORK(&dev->ctrl.reset_work, nvme_reset_work);
+ INIT_WORK(&dev->remove_work, nvme_remove_dead_ctrl_work);
+ mutex_init(&dev->shutdown_lock);
+ init_completion(&dev->ioq_wait);
+
+ result = nvme_setup_prp_pools(dev);
+ if (result)
+ goto unmap;
+
+ quirks |= check_vendor_combination_bug(pdev);
+
+ result = nvme_init_ctrl(&dev->ctrl, &pdev->dev, &nvme_pci_ctrl_ops,
+ quirks);
+ if (result)
+ goto release_pools;
+
+ nvme_change_ctrl_state(&dev->ctrl, NVME_CTRL_RESETTING);
+ dev_info(dev->ctrl.device, "pci function %s\n", dev_name(&pdev->dev));
+
+ queue_work(nvme_wq, &dev->ctrl.reset_work);
+ return 0;
+
+ release_pools:
+ nvme_release_prp_pools(dev);
+ unmap:
+ nvme_dev_unmap(dev);
+ put_pci:
+ put_device(dev->dev);
+ free:
+ kfree(dev->queues);
+ kfree(dev);
+ return result;
+}
+
+static void nvme_reset_prepare(struct pci_dev *pdev)
+{
+ struct nvme_dev *dev = pci_get_drvdata(pdev);
+ nvme_dev_disable(dev, false);
+}
+
+static void nvme_reset_done(struct pci_dev *pdev)
+{
+ struct nvme_dev *dev = pci_get_drvdata(pdev);
+ nvme_reset_ctrl(&dev->ctrl);
+}
+
+static void nvme_shutdown(struct pci_dev *pdev)
+{
+ struct nvme_dev *dev = pci_get_drvdata(pdev);
+ nvme_dev_disable(dev, true);
+}
+
+/*
+ * The driver's remove may be called on a device in a partially initialized
+ * state. This function must not have any dependencies on the device state in
+ * order to proceed.
+ */
+static void nvme_remove(struct pci_dev *pdev)
+{
+ struct nvme_dev *dev = pci_get_drvdata(pdev);
+
+ nvme_change_ctrl_state(&dev->ctrl, NVME_CTRL_DELETING);
+
+ cancel_work_sync(&dev->ctrl.reset_work);
+ pci_set_drvdata(pdev, NULL);
+
+ if (!pci_device_is_present(pdev)) {
+ nvme_change_ctrl_state(&dev->ctrl, NVME_CTRL_DEAD);
+ nvme_dev_disable(dev, false);
+ }
+
+ flush_work(&dev->ctrl.reset_work);
+ nvme_stop_ctrl(&dev->ctrl);
+ nvme_remove_namespaces(&dev->ctrl);
+ nvme_dev_disable(dev, true);
+ nvme_free_host_mem(dev);
+ nvme_dev_remove_admin(dev);
+ nvme_free_queues(dev, 0);
+ nvme_uninit_ctrl(&dev->ctrl);
+ nvme_release_prp_pools(dev);
+ nvme_dev_unmap(dev);
+ nvme_put_ctrl(&dev->ctrl);
+}
+
+static int nvme_pci_sriov_configure(struct pci_dev *pdev, int numvfs)
+{
+ int ret = 0;
+
+ if (numvfs == 0) {
+ if (pci_vfs_assigned(pdev)) {
+ dev_warn(&pdev->dev,
+ "Cannot disable SR-IOV VFs while assigned\n");
+ return -EPERM;
+ }
+ pci_disable_sriov(pdev);
+ return 0;
+ }
+
+ ret = pci_enable_sriov(pdev, numvfs);
+ return ret ? ret : numvfs;
+}
+
+#ifdef CONFIG_PM_SLEEP
+static int nvme_suspend(struct device *dev)
+{
+ struct pci_dev *pdev = to_pci_dev(dev);
+ struct nvme_dev *ndev = pci_get_drvdata(pdev);
+
+ nvme_dev_disable(ndev, true);
+ return 0;
+}
+
+static int nvme_resume(struct device *dev)
+{
+ struct pci_dev *pdev = to_pci_dev(dev);
+ struct nvme_dev *ndev = pci_get_drvdata(pdev);
+
+ nvme_reset_ctrl(&ndev->ctrl);
+ return 0;
+}
+#endif
+
+static SIMPLE_DEV_PM_OPS(nvme_dev_pm_ops, nvme_suspend, nvme_resume);
+
+static pci_ers_result_t nvme_error_detected(struct pci_dev *pdev,
+ pci_channel_state_t state)
+{
+ struct nvme_dev *dev = pci_get_drvdata(pdev);
+
+ /*
+ * A frozen channel requires a reset. When detected, this method will
+ * shutdown the controller to quiesce. The controller will be restarted
+ * after the slot reset through driver's slot_reset callback.
+ */
+ switch (state) {
+ case pci_channel_io_normal:
+ return PCI_ERS_RESULT_CAN_RECOVER;
+ case pci_channel_io_frozen:
+ dev_warn(dev->ctrl.device,
+ "frozen state error detected, reset controller\n");
+ nvme_dev_disable(dev, false);
+ return PCI_ERS_RESULT_NEED_RESET;
+ case pci_channel_io_perm_failure:
+ dev_warn(dev->ctrl.device,
+ "failure state error detected, request disconnect\n");
+ return PCI_ERS_RESULT_DISCONNECT;
+ }
+ return PCI_ERS_RESULT_NEED_RESET;
+}
+
+static pci_ers_result_t nvme_slot_reset(struct pci_dev *pdev)
+{
+ struct nvme_dev *dev = pci_get_drvdata(pdev);
+
+ dev_info(dev->ctrl.device, "restart after slot reset\n");
+ pci_restore_state(pdev);
+ nvme_reset_ctrl(&dev->ctrl);
+ return PCI_ERS_RESULT_RECOVERED;
+}
+
+static void nvme_error_resume(struct pci_dev *pdev)
+{
+ struct nvme_dev *dev = pci_get_drvdata(pdev);
+
+ flush_work(&dev->ctrl.reset_work);
+ pci_cleanup_aer_uncorrect_error_status(pdev);
+}
+
+static const struct pci_error_handlers nvme_err_handler = {
+ .error_detected = nvme_error_detected,
+ .slot_reset = nvme_slot_reset,
+ .resume = nvme_error_resume,
+ .reset_prepare = nvme_reset_prepare,
+ .reset_done = nvme_reset_done,
+};
+
+static const struct pci_device_id nvme_id_table[] = {
+ { PCI_VDEVICE(INTEL, 0x0953),
+ .driver_data = NVME_QUIRK_STRIPE_SIZE |
+ NVME_QUIRK_DEALLOCATE_ZEROES, },
+ { PCI_VDEVICE(INTEL, 0x0a53),
+ .driver_data = NVME_QUIRK_STRIPE_SIZE |
+ NVME_QUIRK_DEALLOCATE_ZEROES, },
+ { PCI_VDEVICE(INTEL, 0x0a54),
+ .driver_data = NVME_QUIRK_STRIPE_SIZE |
+ NVME_QUIRK_DEALLOCATE_ZEROES, },
+ { PCI_VDEVICE(INTEL, 0x0a55),
+ .driver_data = NVME_QUIRK_STRIPE_SIZE |
+ NVME_QUIRK_DEALLOCATE_ZEROES, },
+ { PCI_VDEVICE(INTEL, 0xf1a5), /* Intel 600P/P3100 */
+ .driver_data = NVME_QUIRK_NO_DEEPEST_PS |
+ NVME_QUIRK_MEDIUM_PRIO_SQ },
+ { PCI_VDEVICE(INTEL, 0x5845), /* Qemu emulated controller */
+ .driver_data = NVME_QUIRK_IDENTIFY_CNS, },
+ { PCI_DEVICE(0x1c58, 0x0003), /* HGST adapter */
+ .driver_data = NVME_QUIRK_DELAY_BEFORE_CHK_RDY, },
+ { PCI_DEVICE(0x1c58, 0x0023), /* WDC SN200 adapter */
+ .driver_data = NVME_QUIRK_DELAY_BEFORE_CHK_RDY, },
+ { PCI_DEVICE(0x1c5f, 0x0540), /* Memblaze Pblaze4 adapter */
+ .driver_data = NVME_QUIRK_DELAY_BEFORE_CHK_RDY, },
+ { PCI_DEVICE(0x144d, 0xa821), /* Samsung PM1725 */
+ .driver_data = NVME_QUIRK_DELAY_BEFORE_CHK_RDY, },
+ { PCI_DEVICE(0x144d, 0xa822), /* Samsung PM1725a */
+ .driver_data = NVME_QUIRK_DELAY_BEFORE_CHK_RDY, },
+ { PCI_DEVICE(0x1d1d, 0x1f1f), /* LighNVM qemu device */
+ .driver_data = NVME_QUIRK_LIGHTNVM, },
+ { PCI_DEVICE(0x1d1d, 0x2807), /* CNEX WL */
+ .driver_data = NVME_QUIRK_LIGHTNVM, },
+ { PCI_DEVICE(0x1d1d, 0x2601), /* CNEX Granby */
+ .driver_data = NVME_QUIRK_LIGHTNVM, },
+ { PCI_DEVICE_CLASS(PCI_CLASS_STORAGE_EXPRESS, 0xffffff) },
+ { PCI_DEVICE(PCI_VENDOR_ID_APPLE, 0x2001) },
+ { PCI_DEVICE(PCI_VENDOR_ID_APPLE, 0x2003) },
+ { 0, }
+};
+MODULE_DEVICE_TABLE(pci, nvme_id_table);
+
+static struct pci_driver nvme_driver = {
+ .name = "nvme",
+ .id_table = nvme_id_table,
+ .probe = nvme_probe,
+ .remove = nvme_remove,
+ .shutdown = nvme_shutdown,
+ .driver = {
+ .pm = &nvme_dev_pm_ops,
+ },
+ .sriov_configure = nvme_pci_sriov_configure,
+ .err_handler = &nvme_err_handler,
+};
+
+static int __init nvme_init(void)
+{
+ return pci_register_driver(&nvme_driver);
+}
+
+static void __exit nvme_exit(void)
+{
+ pci_unregister_driver(&nvme_driver);
+ _nvme_check_size();
+}
+
+MODULE_AUTHOR("Matthew Wilcox <willy@linux.intel.com>");
+MODULE_LICENSE("GPL");
+MODULE_VERSION("1.0");
+module_init(nvme_init);
+module_exit(nvme_exit);
diff --git a/src/kernel/linux/v4.14/drivers/nvme/host/rdma.c b/src/kernel/linux/v4.14/drivers/nvme/host/rdma.c
new file mode 100644
index 0000000..c91bfd8
--- /dev/null
+++ b/src/kernel/linux/v4.14/drivers/nvme/host/rdma.c
@@ -0,0 +1,2027 @@
+/*
+ * NVMe over Fabrics RDMA host code.
+ * Copyright (c) 2015-2016 HGST, a Western Digital Company.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ */
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/slab.h>
+#include <linux/err.h>
+#include <linux/string.h>
+#include <linux/atomic.h>
+#include <linux/blk-mq.h>
+#include <linux/blk-mq-rdma.h>
+#include <linux/types.h>
+#include <linux/list.h>
+#include <linux/mutex.h>
+#include <linux/scatterlist.h>
+#include <linux/nvme.h>
+#include <asm/unaligned.h>
+
+#include <rdma/ib_verbs.h>
+#include <rdma/rdma_cm.h>
+#include <linux/nvme-rdma.h>
+
+#include "nvme.h"
+#include "fabrics.h"
+
+
+#define NVME_RDMA_CONNECT_TIMEOUT_MS 3000 /* 3 second */
+
+#define NVME_RDMA_MAX_SEGMENTS 256
+
+#define NVME_RDMA_MAX_INLINE_SEGMENTS 1
+
+/*
+ * We handle AEN commands ourselves and don't even let the
+ * block layer know about them.
+ */
+#define NVME_RDMA_NR_AEN_COMMANDS 1
+#define NVME_RDMA_AQ_BLKMQ_DEPTH \
+ (NVME_AQ_DEPTH - NVME_RDMA_NR_AEN_COMMANDS)
+
+struct nvme_rdma_device {
+ struct ib_device *dev;
+ struct ib_pd *pd;
+ struct kref ref;
+ struct list_head entry;
+};
+
+struct nvme_rdma_qe {
+ struct ib_cqe cqe;
+ void *data;
+ u64 dma;
+};
+
+struct nvme_rdma_queue;
+struct nvme_rdma_request {
+ struct nvme_request req;
+ struct ib_mr *mr;
+ struct nvme_rdma_qe sqe;
+ union nvme_result result;
+ __le16 status;
+ refcount_t ref;
+ struct ib_sge sge[1 + NVME_RDMA_MAX_INLINE_SEGMENTS];
+ u32 num_sge;
+ int nents;
+ bool inline_data;
+ struct ib_reg_wr reg_wr;
+ struct ib_cqe reg_cqe;
+ struct nvme_rdma_queue *queue;
+ struct sg_table sg_table;
+ struct scatterlist first_sgl[];
+};
+
+enum nvme_rdma_queue_flags {
+ NVME_RDMA_Q_LIVE = 0,
+ NVME_RDMA_Q_DELETING = 1,
+};
+
+struct nvme_rdma_queue {
+ struct nvme_rdma_qe *rsp_ring;
+ int queue_size;
+ size_t cmnd_capsule_len;
+ struct nvme_rdma_ctrl *ctrl;
+ struct nvme_rdma_device *device;
+ struct ib_cq *ib_cq;
+ struct ib_qp *qp;
+
+ unsigned long flags;
+ struct rdma_cm_id *cm_id;
+ int cm_error;
+ struct completion cm_done;
+};
+
+struct nvme_rdma_ctrl {
+ /* read only in the hot path */
+ struct nvme_rdma_queue *queues;
+
+ /* other member variables */
+ struct blk_mq_tag_set tag_set;
+ struct work_struct delete_work;
+ struct work_struct err_work;
+
+ struct nvme_rdma_qe async_event_sqe;
+
+ struct delayed_work reconnect_work;
+
+ struct list_head list;
+
+ struct blk_mq_tag_set admin_tag_set;
+ struct nvme_rdma_device *device;
+
+ u32 max_fr_pages;
+
+ struct sockaddr_storage addr;
+ struct sockaddr_storage src_addr;
+
+ struct nvme_ctrl ctrl;
+};
+
+static inline struct nvme_rdma_ctrl *to_rdma_ctrl(struct nvme_ctrl *ctrl)
+{
+ return container_of(ctrl, struct nvme_rdma_ctrl, ctrl);
+}
+
+static LIST_HEAD(device_list);
+static DEFINE_MUTEX(device_list_mutex);
+
+static LIST_HEAD(nvme_rdma_ctrl_list);
+static DEFINE_MUTEX(nvme_rdma_ctrl_mutex);
+
+/*
+ * Disabling this option makes small I/O goes faster, but is fundamentally
+ * unsafe. With it turned off we will have to register a global rkey that
+ * allows read and write access to all physical memory.
+ */
+static bool register_always = true;
+module_param(register_always, bool, 0444);
+MODULE_PARM_DESC(register_always,
+ "Use memory registration even for contiguous memory regions");
+
+static int nvme_rdma_cm_handler(struct rdma_cm_id *cm_id,
+ struct rdma_cm_event *event);
+static void nvme_rdma_recv_done(struct ib_cq *cq, struct ib_wc *wc);
+
+static const struct blk_mq_ops nvme_rdma_mq_ops;
+static const struct blk_mq_ops nvme_rdma_admin_mq_ops;
+
+/* XXX: really should move to a generic header sooner or later.. */
+static inline void put_unaligned_le24(u32 val, u8 *p)
+{
+ *p++ = val;
+ *p++ = val >> 8;
+ *p++ = val >> 16;
+}
+
+static inline int nvme_rdma_queue_idx(struct nvme_rdma_queue *queue)
+{
+ return queue - queue->ctrl->queues;
+}
+
+static inline size_t nvme_rdma_inline_data_size(struct nvme_rdma_queue *queue)
+{
+ return queue->cmnd_capsule_len - sizeof(struct nvme_command);
+}
+
+static void nvme_rdma_free_qe(struct ib_device *ibdev, struct nvme_rdma_qe *qe,
+ size_t capsule_size, enum dma_data_direction dir)
+{
+ ib_dma_unmap_single(ibdev, qe->dma, capsule_size, dir);
+ kfree(qe->data);
+}
+
+static int nvme_rdma_alloc_qe(struct ib_device *ibdev, struct nvme_rdma_qe *qe,
+ size_t capsule_size, enum dma_data_direction dir)
+{
+ qe->data = kzalloc(capsule_size, GFP_KERNEL);
+ if (!qe->data)
+ return -ENOMEM;
+
+ qe->dma = ib_dma_map_single(ibdev, qe->data, capsule_size, dir);
+ if (ib_dma_mapping_error(ibdev, qe->dma)) {
+ kfree(qe->data);
+ return -ENOMEM;
+ }
+
+ return 0;
+}
+
+static void nvme_rdma_free_ring(struct ib_device *ibdev,
+ struct nvme_rdma_qe *ring, size_t ib_queue_size,
+ size_t capsule_size, enum dma_data_direction dir)
+{
+ int i;
+
+ for (i = 0; i < ib_queue_size; i++)
+ nvme_rdma_free_qe(ibdev, &ring[i], capsule_size, dir);
+ kfree(ring);
+}
+
+static struct nvme_rdma_qe *nvme_rdma_alloc_ring(struct ib_device *ibdev,
+ size_t ib_queue_size, size_t capsule_size,
+ enum dma_data_direction dir)
+{
+ struct nvme_rdma_qe *ring;
+ int i;
+
+ ring = kcalloc(ib_queue_size, sizeof(struct nvme_rdma_qe), GFP_KERNEL);
+ if (!ring)
+ return NULL;
+
+ for (i = 0; i < ib_queue_size; i++) {
+ if (nvme_rdma_alloc_qe(ibdev, &ring[i], capsule_size, dir))
+ goto out_free_ring;
+ }
+
+ return ring;
+
+out_free_ring:
+ nvme_rdma_free_ring(ibdev, ring, i, capsule_size, dir);
+ return NULL;
+}
+
+static void nvme_rdma_qp_event(struct ib_event *event, void *context)
+{
+ pr_debug("QP event %s (%d)\n",
+ ib_event_msg(event->event), event->event);
+
+}
+
+static int nvme_rdma_wait_for_cm(struct nvme_rdma_queue *queue)
+{
+ wait_for_completion_interruptible_timeout(&queue->cm_done,
+ msecs_to_jiffies(NVME_RDMA_CONNECT_TIMEOUT_MS) + 1);
+ return queue->cm_error;
+}
+
+static int nvme_rdma_create_qp(struct nvme_rdma_queue *queue, const int factor)
+{
+ struct nvme_rdma_device *dev = queue->device;
+ struct ib_qp_init_attr init_attr;
+ int ret;
+
+ memset(&init_attr, 0, sizeof(init_attr));
+ init_attr.event_handler = nvme_rdma_qp_event;
+ /* +1 for drain */
+ init_attr.cap.max_send_wr = factor * queue->queue_size + 1;
+ /* +1 for drain */
+ init_attr.cap.max_recv_wr = queue->queue_size + 1;
+ init_attr.cap.max_recv_sge = 1;
+ init_attr.cap.max_send_sge = 1 + NVME_RDMA_MAX_INLINE_SEGMENTS;
+ init_attr.sq_sig_type = IB_SIGNAL_REQ_WR;
+ init_attr.qp_type = IB_QPT_RC;
+ init_attr.send_cq = queue->ib_cq;
+ init_attr.recv_cq = queue->ib_cq;
+
+ ret = rdma_create_qp(queue->cm_id, dev->pd, &init_attr);
+
+ queue->qp = queue->cm_id->qp;
+ return ret;
+}
+
+static int nvme_rdma_reinit_request(void *data, struct request *rq)
+{
+ struct nvme_rdma_ctrl *ctrl = data;
+ struct nvme_rdma_device *dev = ctrl->device;
+ struct nvme_rdma_request *req = blk_mq_rq_to_pdu(rq);
+ int ret = 0;
+
+ ib_dereg_mr(req->mr);
+
+ req->mr = ib_alloc_mr(dev->pd, IB_MR_TYPE_MEM_REG,
+ ctrl->max_fr_pages);
+ if (IS_ERR(req->mr)) {
+ ret = PTR_ERR(req->mr);
+ req->mr = NULL;
+ goto out;
+ }
+
+ req->mr->need_inval = false;
+
+out:
+ return ret;
+}
+
+static void nvme_rdma_exit_request(struct blk_mq_tag_set *set,
+ struct request *rq, unsigned int hctx_idx)
+{
+ struct nvme_rdma_ctrl *ctrl = set->driver_data;
+ struct nvme_rdma_request *req = blk_mq_rq_to_pdu(rq);
+ int queue_idx = (set == &ctrl->tag_set) ? hctx_idx + 1 : 0;
+ struct nvme_rdma_queue *queue = &ctrl->queues[queue_idx];
+ struct nvme_rdma_device *dev = queue->device;
+
+ if (req->mr)
+ ib_dereg_mr(req->mr);
+
+ nvme_rdma_free_qe(dev->dev, &req->sqe, sizeof(struct nvme_command),
+ DMA_TO_DEVICE);
+}
+
+static int nvme_rdma_init_request(struct blk_mq_tag_set *set,
+ struct request *rq, unsigned int hctx_idx,
+ unsigned int numa_node)
+{
+ struct nvme_rdma_ctrl *ctrl = set->driver_data;
+ struct nvme_rdma_request *req = blk_mq_rq_to_pdu(rq);
+ int queue_idx = (set == &ctrl->tag_set) ? hctx_idx + 1 : 0;
+ struct nvme_rdma_queue *queue = &ctrl->queues[queue_idx];
+ struct nvme_rdma_device *dev = queue->device;
+ struct ib_device *ibdev = dev->dev;
+ int ret;
+
+ ret = nvme_rdma_alloc_qe(ibdev, &req->sqe, sizeof(struct nvme_command),
+ DMA_TO_DEVICE);
+ if (ret)
+ return ret;
+
+ req->mr = ib_alloc_mr(dev->pd, IB_MR_TYPE_MEM_REG,
+ ctrl->max_fr_pages);
+ if (IS_ERR(req->mr)) {
+ ret = PTR_ERR(req->mr);
+ goto out_free_qe;
+ }
+
+ req->queue = queue;
+
+ return 0;
+
+out_free_qe:
+ nvme_rdma_free_qe(dev->dev, &req->sqe, sizeof(struct nvme_command),
+ DMA_TO_DEVICE);
+ return -ENOMEM;
+}
+
+static int nvme_rdma_init_hctx(struct blk_mq_hw_ctx *hctx, void *data,
+ unsigned int hctx_idx)
+{
+ struct nvme_rdma_ctrl *ctrl = data;
+ struct nvme_rdma_queue *queue = &ctrl->queues[hctx_idx + 1];
+
+ BUG_ON(hctx_idx >= ctrl->ctrl.queue_count);
+
+ hctx->driver_data = queue;
+ return 0;
+}
+
+static int nvme_rdma_init_admin_hctx(struct blk_mq_hw_ctx *hctx, void *data,
+ unsigned int hctx_idx)
+{
+ struct nvme_rdma_ctrl *ctrl = data;
+ struct nvme_rdma_queue *queue = &ctrl->queues[0];
+
+ BUG_ON(hctx_idx != 0);
+
+ hctx->driver_data = queue;
+ return 0;
+}
+
+static void nvme_rdma_free_dev(struct kref *ref)
+{
+ struct nvme_rdma_device *ndev =
+ container_of(ref, struct nvme_rdma_device, ref);
+
+ mutex_lock(&device_list_mutex);
+ list_del(&ndev->entry);
+ mutex_unlock(&device_list_mutex);
+
+ ib_dealloc_pd(ndev->pd);
+ kfree(ndev);
+}
+
+static void nvme_rdma_dev_put(struct nvme_rdma_device *dev)
+{
+ kref_put(&dev->ref, nvme_rdma_free_dev);
+}
+
+static int nvme_rdma_dev_get(struct nvme_rdma_device *dev)
+{
+ return kref_get_unless_zero(&dev->ref);
+}
+
+static struct nvme_rdma_device *
+nvme_rdma_find_get_device(struct rdma_cm_id *cm_id)
+{
+ struct nvme_rdma_device *ndev;
+
+ mutex_lock(&device_list_mutex);
+ list_for_each_entry(ndev, &device_list, entry) {
+ if (ndev->dev->node_guid == cm_id->device->node_guid &&
+ nvme_rdma_dev_get(ndev))
+ goto out_unlock;
+ }
+
+ ndev = kzalloc(sizeof(*ndev), GFP_KERNEL);
+ if (!ndev)
+ goto out_err;
+
+ ndev->dev = cm_id->device;
+ kref_init(&ndev->ref);
+
+ ndev->pd = ib_alloc_pd(ndev->dev,
+ register_always ? 0 : IB_PD_UNSAFE_GLOBAL_RKEY);
+ if (IS_ERR(ndev->pd))
+ goto out_free_dev;
+
+ if (!(ndev->dev->attrs.device_cap_flags &
+ IB_DEVICE_MEM_MGT_EXTENSIONS)) {
+ dev_err(&ndev->dev->dev,
+ "Memory registrations not supported.\n");
+ goto out_free_pd;
+ }
+
+ list_add(&ndev->entry, &device_list);
+out_unlock:
+ mutex_unlock(&device_list_mutex);
+ return ndev;
+
+out_free_pd:
+ ib_dealloc_pd(ndev->pd);
+out_free_dev:
+ kfree(ndev);
+out_err:
+ mutex_unlock(&device_list_mutex);
+ return NULL;
+}
+
+static void nvme_rdma_destroy_queue_ib(struct nvme_rdma_queue *queue)
+{
+ struct nvme_rdma_device *dev;
+ struct ib_device *ibdev;
+
+ dev = queue->device;
+ ibdev = dev->dev;
+ rdma_destroy_qp(queue->cm_id);
+ ib_free_cq(queue->ib_cq);
+
+ nvme_rdma_free_ring(ibdev, queue->rsp_ring, queue->queue_size,
+ sizeof(struct nvme_completion), DMA_FROM_DEVICE);
+
+ nvme_rdma_dev_put(dev);
+}
+
+static int nvme_rdma_create_queue_ib(struct nvme_rdma_queue *queue)
+{
+ struct ib_device *ibdev;
+ const int send_wr_factor = 3; /* MR, SEND, INV */
+ const int cq_factor = send_wr_factor + 1; /* + RECV */
+ int comp_vector, idx = nvme_rdma_queue_idx(queue);
+ int ret;
+
+ queue->device = nvme_rdma_find_get_device(queue->cm_id);
+ if (!queue->device) {
+ dev_err(queue->cm_id->device->dev.parent,
+ "no client data found!\n");
+ return -ECONNREFUSED;
+ }
+ ibdev = queue->device->dev;
+
+ /*
+ * Spread I/O queues completion vectors according their queue index.
+ * Admin queues can always go on completion vector 0.
+ */
+ comp_vector = (idx == 0 ? idx : idx - 1) % ibdev->num_comp_vectors;
+
+ /* +1 for ib_stop_cq */
+ queue->ib_cq = ib_alloc_cq(ibdev, queue,
+ cq_factor * queue->queue_size + 1,
+ comp_vector, IB_POLL_SOFTIRQ);
+ if (IS_ERR(queue->ib_cq)) {
+ ret = PTR_ERR(queue->ib_cq);
+ goto out_put_dev;
+ }
+
+ ret = nvme_rdma_create_qp(queue, send_wr_factor);
+ if (ret)
+ goto out_destroy_ib_cq;
+
+ queue->rsp_ring = nvme_rdma_alloc_ring(ibdev, queue->queue_size,
+ sizeof(struct nvme_completion), DMA_FROM_DEVICE);
+ if (!queue->rsp_ring) {
+ ret = -ENOMEM;
+ goto out_destroy_qp;
+ }
+
+ return 0;
+
+out_destroy_qp:
+ ib_destroy_qp(queue->qp);
+out_destroy_ib_cq:
+ ib_free_cq(queue->ib_cq);
+out_put_dev:
+ nvme_rdma_dev_put(queue->device);
+ return ret;
+}
+
+static int nvme_rdma_alloc_queue(struct nvme_rdma_ctrl *ctrl,
+ int idx, size_t queue_size)
+{
+ struct nvme_rdma_queue *queue;
+ struct sockaddr *src_addr = NULL;
+ int ret;
+
+ queue = &ctrl->queues[idx];
+ queue->ctrl = ctrl;
+ init_completion(&queue->cm_done);
+
+ if (idx > 0)
+ queue->cmnd_capsule_len = ctrl->ctrl.ioccsz * 16;
+ else
+ queue->cmnd_capsule_len = sizeof(struct nvme_command);
+
+ queue->queue_size = queue_size;
+
+ queue->cm_id = rdma_create_id(&init_net, nvme_rdma_cm_handler, queue,
+ RDMA_PS_TCP, IB_QPT_RC);
+ if (IS_ERR(queue->cm_id)) {
+ dev_info(ctrl->ctrl.device,
+ "failed to create CM ID: %ld\n", PTR_ERR(queue->cm_id));
+ return PTR_ERR(queue->cm_id);
+ }
+
+ if (ctrl->ctrl.opts->mask & NVMF_OPT_HOST_TRADDR)
+ src_addr = (struct sockaddr *)&ctrl->src_addr;
+
+ queue->cm_error = -ETIMEDOUT;
+ ret = rdma_resolve_addr(queue->cm_id, src_addr,
+ (struct sockaddr *)&ctrl->addr,
+ NVME_RDMA_CONNECT_TIMEOUT_MS);
+ if (ret) {
+ dev_info(ctrl->ctrl.device,
+ "rdma_resolve_addr failed (%d).\n", ret);
+ goto out_destroy_cm_id;
+ }
+
+ ret = nvme_rdma_wait_for_cm(queue);
+ if (ret) {
+ dev_info(ctrl->ctrl.device,
+ "rdma_resolve_addr wait failed (%d).\n", ret);
+ goto out_destroy_cm_id;
+ }
+
+ clear_bit(NVME_RDMA_Q_DELETING, &queue->flags);
+
+ return 0;
+
+out_destroy_cm_id:
+ rdma_destroy_id(queue->cm_id);
+ return ret;
+}
+
+static void nvme_rdma_stop_queue(struct nvme_rdma_queue *queue)
+{
+ if (!test_and_clear_bit(NVME_RDMA_Q_LIVE, &queue->flags))
+ return;
+
+ rdma_disconnect(queue->cm_id);
+ ib_drain_qp(queue->qp);
+}
+
+static void nvme_rdma_free_queue(struct nvme_rdma_queue *queue)
+{
+ if (test_and_set_bit(NVME_RDMA_Q_DELETING, &queue->flags))
+ return;
+
+ if (nvme_rdma_queue_idx(queue) == 0) {
+ nvme_rdma_free_qe(queue->device->dev,
+ &queue->ctrl->async_event_sqe,
+ sizeof(struct nvme_command), DMA_TO_DEVICE);
+ }
+
+ nvme_rdma_destroy_queue_ib(queue);
+ rdma_destroy_id(queue->cm_id);
+}
+
+static void nvme_rdma_free_io_queues(struct nvme_rdma_ctrl *ctrl)
+{
+ int i;
+
+ for (i = 1; i < ctrl->ctrl.queue_count; i++)
+ nvme_rdma_free_queue(&ctrl->queues[i]);
+}
+
+static void nvme_rdma_stop_io_queues(struct nvme_rdma_ctrl *ctrl)
+{
+ int i;
+
+ for (i = 1; i < ctrl->ctrl.queue_count; i++)
+ nvme_rdma_stop_queue(&ctrl->queues[i]);
+}
+
+static int nvme_rdma_start_queue(struct nvme_rdma_ctrl *ctrl, int idx)
+{
+ int ret;
+
+ if (idx)
+ ret = nvmf_connect_io_queue(&ctrl->ctrl, idx);
+ else
+ ret = nvmf_connect_admin_queue(&ctrl->ctrl);
+
+ if (!ret)
+ set_bit(NVME_RDMA_Q_LIVE, &ctrl->queues[idx].flags);
+ else
+ dev_info(ctrl->ctrl.device,
+ "failed to connect queue: %d ret=%d\n", idx, ret);
+ return ret;
+}
+
+static int nvme_rdma_start_io_queues(struct nvme_rdma_ctrl *ctrl)
+{
+ int i, ret = 0;
+
+ for (i = 1; i < ctrl->ctrl.queue_count; i++) {
+ ret = nvme_rdma_start_queue(ctrl, i);
+ if (ret)
+ goto out_stop_queues;
+ }
+
+ return 0;
+
+out_stop_queues:
+ for (i--; i >= 1; i--)
+ nvme_rdma_stop_queue(&ctrl->queues[i]);
+ return ret;
+}
+
+static int nvme_rdma_alloc_io_queues(struct nvme_rdma_ctrl *ctrl)
+{
+ struct nvmf_ctrl_options *opts = ctrl->ctrl.opts;
+ struct ib_device *ibdev = ctrl->device->dev;
+ unsigned int nr_io_queues;
+ int i, ret;
+
+ nr_io_queues = min(opts->nr_io_queues, num_online_cpus());
+
+ /*
+ * we map queues according to the device irq vectors for
+ * optimal locality so we don't need more queues than
+ * completion vectors.
+ */
+ nr_io_queues = min_t(unsigned int, nr_io_queues,
+ ibdev->num_comp_vectors);
+
+ ret = nvme_set_queue_count(&ctrl->ctrl, &nr_io_queues);
+ if (ret)
+ return ret;
+
+ ctrl->ctrl.queue_count = nr_io_queues + 1;
+ if (ctrl->ctrl.queue_count < 2)
+ return 0;
+
+ dev_info(ctrl->ctrl.device,
+ "creating %d I/O queues.\n", nr_io_queues);
+
+ for (i = 1; i < ctrl->ctrl.queue_count; i++) {
+ ret = nvme_rdma_alloc_queue(ctrl, i,
+ ctrl->ctrl.sqsize + 1);
+ if (ret)
+ goto out_free_queues;
+ }
+
+ return 0;
+
+out_free_queues:
+ for (i--; i >= 1; i--)
+ nvme_rdma_free_queue(&ctrl->queues[i]);
+
+ return ret;
+}
+
+static void nvme_rdma_free_tagset(struct nvme_ctrl *nctrl, bool admin)
+{
+ struct nvme_rdma_ctrl *ctrl = to_rdma_ctrl(nctrl);
+ struct blk_mq_tag_set *set = admin ?
+ &ctrl->admin_tag_set : &ctrl->tag_set;
+
+ blk_mq_free_tag_set(set);
+ nvme_rdma_dev_put(ctrl->device);
+}
+
+static struct blk_mq_tag_set *nvme_rdma_alloc_tagset(struct nvme_ctrl *nctrl,
+ bool admin)
+{
+ struct nvme_rdma_ctrl *ctrl = to_rdma_ctrl(nctrl);
+ struct blk_mq_tag_set *set;
+ int ret;
+
+ if (admin) {
+ set = &ctrl->admin_tag_set;
+ memset(set, 0, sizeof(*set));
+ set->ops = &nvme_rdma_admin_mq_ops;
+ set->queue_depth = NVME_RDMA_AQ_BLKMQ_DEPTH;
+ set->reserved_tags = 2; /* connect + keep-alive */
+ set->numa_node = NUMA_NO_NODE;
+ set->cmd_size = sizeof(struct nvme_rdma_request) +
+ SG_CHUNK_SIZE * sizeof(struct scatterlist);
+ set->driver_data = ctrl;
+ set->nr_hw_queues = 1;
+ set->timeout = ADMIN_TIMEOUT;
+ } else {
+ set = &ctrl->tag_set;
+ memset(set, 0, sizeof(*set));
+ set->ops = &nvme_rdma_mq_ops;
+ set->queue_depth = nctrl->opts->queue_size;
+ set->reserved_tags = 1; /* fabric connect */
+ set->numa_node = NUMA_NO_NODE;
+ set->flags = BLK_MQ_F_SHOULD_MERGE;
+ set->cmd_size = sizeof(struct nvme_rdma_request) +
+ SG_CHUNK_SIZE * sizeof(struct scatterlist);
+ set->driver_data = ctrl;
+ set->nr_hw_queues = nctrl->queue_count - 1;
+ set->timeout = NVME_IO_TIMEOUT;
+ }
+
+ ret = blk_mq_alloc_tag_set(set);
+ if (ret)
+ goto out;
+
+ /*
+ * We need a reference on the device as long as the tag_set is alive,
+ * as the MRs in the request structures need a valid ib_device.
+ */
+ ret = nvme_rdma_dev_get(ctrl->device);
+ if (!ret) {
+ ret = -EINVAL;
+ goto out_free_tagset;
+ }
+
+ return set;
+
+out_free_tagset:
+ blk_mq_free_tag_set(set);
+out:
+ return ERR_PTR(ret);
+}
+
+static void nvme_rdma_destroy_admin_queue(struct nvme_rdma_ctrl *ctrl,
+ bool remove)
+{
+ nvme_rdma_stop_queue(&ctrl->queues[0]);
+ if (remove) {
+ blk_cleanup_queue(ctrl->ctrl.admin_q);
+ nvme_rdma_free_tagset(&ctrl->ctrl, true);
+ }
+ nvme_rdma_free_queue(&ctrl->queues[0]);
+}
+
+static int nvme_rdma_configure_admin_queue(struct nvme_rdma_ctrl *ctrl,
+ bool new)
+{
+ int error;
+
+ error = nvme_rdma_alloc_queue(ctrl, 0, NVME_AQ_DEPTH);
+ if (error)
+ return error;
+
+ ctrl->device = ctrl->queues[0].device;
+
+ ctrl->max_fr_pages = min_t(u32, NVME_RDMA_MAX_SEGMENTS,
+ ctrl->device->dev->attrs.max_fast_reg_page_list_len);
+
+ if (new) {
+ ctrl->ctrl.admin_tagset = nvme_rdma_alloc_tagset(&ctrl->ctrl, true);
+ if (IS_ERR(ctrl->ctrl.admin_tagset)) {
+ error = PTR_ERR(ctrl->ctrl.admin_tagset);
+ goto out_free_queue;
+ }
+
+ ctrl->ctrl.admin_q = blk_mq_init_queue(&ctrl->admin_tag_set);
+ if (IS_ERR(ctrl->ctrl.admin_q)) {
+ error = PTR_ERR(ctrl->ctrl.admin_q);
+ goto out_free_tagset;
+ }
+ } else {
+ error = blk_mq_reinit_tagset(&ctrl->admin_tag_set,
+ nvme_rdma_reinit_request);
+ if (error)
+ goto out_free_queue;
+ }
+
+ error = nvme_rdma_start_queue(ctrl, 0);
+ if (error)
+ goto out_cleanup_queue;
+
+ error = ctrl->ctrl.ops->reg_read64(&ctrl->ctrl, NVME_REG_CAP,
+ &ctrl->ctrl.cap);
+ if (error) {
+ dev_err(ctrl->ctrl.device,
+ "prop_get NVME_REG_CAP failed\n");
+ goto out_stop_queue;
+ }
+
+ ctrl->ctrl.sqsize =
+ min_t(int, NVME_CAP_MQES(ctrl->ctrl.cap), ctrl->ctrl.sqsize);
+
+ error = nvme_enable_ctrl(&ctrl->ctrl, ctrl->ctrl.cap);
+ if (error)
+ goto out_stop_queue;
+
+ ctrl->ctrl.max_hw_sectors =
+ (ctrl->max_fr_pages - 1) << (ilog2(SZ_4K) - 9);
+
+ error = nvme_init_identify(&ctrl->ctrl);
+ if (error)
+ goto out_stop_queue;
+
+ error = nvme_rdma_alloc_qe(ctrl->queues[0].device->dev,
+ &ctrl->async_event_sqe, sizeof(struct nvme_command),
+ DMA_TO_DEVICE);
+ if (error)
+ goto out_stop_queue;
+
+ return 0;
+
+out_stop_queue:
+ nvme_rdma_stop_queue(&ctrl->queues[0]);
+out_cleanup_queue:
+ if (new)
+ blk_cleanup_queue(ctrl->ctrl.admin_q);
+out_free_tagset:
+ if (new)
+ nvme_rdma_free_tagset(&ctrl->ctrl, true);
+out_free_queue:
+ nvme_rdma_free_queue(&ctrl->queues[0]);
+ return error;
+}
+
+static void nvme_rdma_destroy_io_queues(struct nvme_rdma_ctrl *ctrl,
+ bool remove)
+{
+ nvme_rdma_stop_io_queues(ctrl);
+ if (remove) {
+ blk_cleanup_queue(ctrl->ctrl.connect_q);
+ nvme_rdma_free_tagset(&ctrl->ctrl, false);
+ }
+ nvme_rdma_free_io_queues(ctrl);
+}
+
+static int nvme_rdma_configure_io_queues(struct nvme_rdma_ctrl *ctrl, bool new)
+{
+ int ret;
+
+ ret = nvme_rdma_alloc_io_queues(ctrl);
+ if (ret)
+ return ret;
+
+ if (new) {
+ ctrl->ctrl.tagset = nvme_rdma_alloc_tagset(&ctrl->ctrl, false);
+ if (IS_ERR(ctrl->ctrl.tagset)) {
+ ret = PTR_ERR(ctrl->ctrl.tagset);
+ goto out_free_io_queues;
+ }
+
+ ctrl->ctrl.connect_q = blk_mq_init_queue(&ctrl->tag_set);
+ if (IS_ERR(ctrl->ctrl.connect_q)) {
+ ret = PTR_ERR(ctrl->ctrl.connect_q);
+ goto out_free_tag_set;
+ }
+ } else {
+ ret = blk_mq_reinit_tagset(&ctrl->tag_set,
+ nvme_rdma_reinit_request);
+ if (ret)
+ goto out_free_io_queues;
+
+ blk_mq_update_nr_hw_queues(&ctrl->tag_set,
+ ctrl->ctrl.queue_count - 1);
+ }
+
+ ret = nvme_rdma_start_io_queues(ctrl);
+ if (ret)
+ goto out_cleanup_connect_q;
+
+ return 0;
+
+out_cleanup_connect_q:
+ if (new)
+ blk_cleanup_queue(ctrl->ctrl.connect_q);
+out_free_tag_set:
+ if (new)
+ nvme_rdma_free_tagset(&ctrl->ctrl, false);
+out_free_io_queues:
+ nvme_rdma_free_io_queues(ctrl);
+ return ret;
+}
+
+static void nvme_rdma_free_ctrl(struct nvme_ctrl *nctrl)
+{
+ struct nvme_rdma_ctrl *ctrl = to_rdma_ctrl(nctrl);
+
+ if (list_empty(&ctrl->list))
+ goto free_ctrl;
+
+ mutex_lock(&nvme_rdma_ctrl_mutex);
+ list_del(&ctrl->list);
+ mutex_unlock(&nvme_rdma_ctrl_mutex);
+
+ kfree(ctrl->queues);
+ nvmf_free_options(nctrl->opts);
+free_ctrl:
+ kfree(ctrl);
+}
+
+static void nvme_rdma_reconnect_or_remove(struct nvme_rdma_ctrl *ctrl)
+{
+ /* If we are resetting/deleting then do nothing */
+ if (ctrl->ctrl.state != NVME_CTRL_RECONNECTING) {
+ WARN_ON_ONCE(ctrl->ctrl.state == NVME_CTRL_NEW ||
+ ctrl->ctrl.state == NVME_CTRL_LIVE);
+ return;
+ }
+
+ if (nvmf_should_reconnect(&ctrl->ctrl)) {
+ dev_info(ctrl->ctrl.device, "Reconnecting in %d seconds...\n",
+ ctrl->ctrl.opts->reconnect_delay);
+ queue_delayed_work(nvme_wq, &ctrl->reconnect_work,
+ ctrl->ctrl.opts->reconnect_delay * HZ);
+ } else {
+ dev_info(ctrl->ctrl.device, "Removing controller...\n");
+ queue_work(nvme_wq, &ctrl->delete_work);
+ }
+}
+
+static void nvme_rdma_reconnect_ctrl_work(struct work_struct *work)
+{
+ struct nvme_rdma_ctrl *ctrl = container_of(to_delayed_work(work),
+ struct nvme_rdma_ctrl, reconnect_work);
+ bool changed;
+ int ret;
+
+ ++ctrl->ctrl.nr_reconnects;
+
+ if (ctrl->ctrl.queue_count > 1)
+ nvme_rdma_destroy_io_queues(ctrl, false);
+
+ nvme_rdma_destroy_admin_queue(ctrl, false);
+ ret = nvme_rdma_configure_admin_queue(ctrl, false);
+ if (ret)
+ goto requeue;
+
+ if (ctrl->ctrl.queue_count > 1) {
+ ret = nvme_rdma_configure_io_queues(ctrl, false);
+ if (ret)
+ goto requeue;
+ }
+
+ changed = nvme_change_ctrl_state(&ctrl->ctrl, NVME_CTRL_LIVE);
+ if (!changed) {
+ /* state change failure is ok if we're in DELETING state */
+ WARN_ON_ONCE(ctrl->ctrl.state != NVME_CTRL_DELETING);
+ return;
+ }
+
+ ctrl->ctrl.nr_reconnects = 0;
+
+ nvme_start_ctrl(&ctrl->ctrl);
+
+ dev_info(ctrl->ctrl.device, "Successfully reconnected\n");
+
+ return;
+
+requeue:
+ dev_info(ctrl->ctrl.device, "Failed reconnect attempt %d\n",
+ ctrl->ctrl.nr_reconnects);
+ nvme_rdma_reconnect_or_remove(ctrl);
+}
+
+static void nvme_rdma_error_recovery_work(struct work_struct *work)
+{
+ struct nvme_rdma_ctrl *ctrl = container_of(work,
+ struct nvme_rdma_ctrl, err_work);
+
+ nvme_stop_keep_alive(&ctrl->ctrl);
+
+ if (ctrl->ctrl.queue_count > 1) {
+ nvme_stop_queues(&ctrl->ctrl);
+ nvme_rdma_stop_io_queues(ctrl);
+ }
+ blk_mq_quiesce_queue(ctrl->ctrl.admin_q);
+ nvme_rdma_stop_queue(&ctrl->queues[0]);
+
+ /* We must take care of fastfail/requeue all our inflight requests */
+ if (ctrl->ctrl.queue_count > 1)
+ blk_mq_tagset_busy_iter(&ctrl->tag_set,
+ nvme_cancel_request, &ctrl->ctrl);
+ blk_mq_tagset_busy_iter(&ctrl->admin_tag_set,
+ nvme_cancel_request, &ctrl->ctrl);
+
+ /*
+ * queues are not a live anymore, so restart the queues to fail fast
+ * new IO
+ */
+ blk_mq_unquiesce_queue(ctrl->ctrl.admin_q);
+ nvme_start_queues(&ctrl->ctrl);
+
+ nvme_rdma_reconnect_or_remove(ctrl);
+}
+
+static void nvme_rdma_error_recovery(struct nvme_rdma_ctrl *ctrl)
+{
+ if (!nvme_change_ctrl_state(&ctrl->ctrl, NVME_CTRL_RECONNECTING))
+ return;
+
+ queue_work(nvme_wq, &ctrl->err_work);
+}
+
+static void nvme_rdma_wr_error(struct ib_cq *cq, struct ib_wc *wc,
+ const char *op)
+{
+ struct nvme_rdma_queue *queue = cq->cq_context;
+ struct nvme_rdma_ctrl *ctrl = queue->ctrl;
+
+ if (ctrl->ctrl.state == NVME_CTRL_LIVE)
+ dev_info(ctrl->ctrl.device,
+ "%s for CQE 0x%p failed with status %s (%d)\n",
+ op, wc->wr_cqe,
+ ib_wc_status_msg(wc->status), wc->status);
+ nvme_rdma_error_recovery(ctrl);
+}
+
+static void nvme_rdma_memreg_done(struct ib_cq *cq, struct ib_wc *wc)
+{
+ if (unlikely(wc->status != IB_WC_SUCCESS))
+ nvme_rdma_wr_error(cq, wc, "MEMREG");
+}
+
+static void nvme_rdma_inv_rkey_done(struct ib_cq *cq, struct ib_wc *wc)
+{
+ if (unlikely(wc->status != IB_WC_SUCCESS))
+ nvme_rdma_wr_error(cq, wc, "LOCAL_INV");
+}
+
+static int nvme_rdma_inv_rkey(struct nvme_rdma_queue *queue,
+ struct nvme_rdma_request *req)
+{
+ struct ib_send_wr *bad_wr;
+ struct ib_send_wr wr = {
+ .opcode = IB_WR_LOCAL_INV,
+ .next = NULL,
+ .num_sge = 0,
+ .send_flags = 0,
+ .ex.invalidate_rkey = req->mr->rkey,
+ };
+
+ req->reg_cqe.done = nvme_rdma_inv_rkey_done;
+ wr.wr_cqe = &req->reg_cqe;
+
+ return ib_post_send(queue->qp, &wr, &bad_wr);
+}
+
+static void nvme_rdma_unmap_data(struct nvme_rdma_queue *queue,
+ struct request *rq)
+{
+ struct nvme_rdma_request *req = blk_mq_rq_to_pdu(rq);
+ struct nvme_rdma_ctrl *ctrl = queue->ctrl;
+ struct nvme_rdma_device *dev = queue->device;
+ struct ib_device *ibdev = dev->dev;
+ int res;
+
+ if (!blk_rq_bytes(rq))
+ return;
+
+ if (req->mr->need_inval) {
+ res = nvme_rdma_inv_rkey(queue, req);
+ if (unlikely(res < 0)) {
+ dev_err(ctrl->ctrl.device,
+ "Queueing INV WR for rkey %#x failed (%d)\n",
+ req->mr->rkey, res);
+ nvme_rdma_error_recovery(queue->ctrl);
+ }
+ }
+
+ ib_dma_unmap_sg(ibdev, req->sg_table.sgl,
+ req->nents, rq_data_dir(rq) ==
+ WRITE ? DMA_TO_DEVICE : DMA_FROM_DEVICE);
+
+ nvme_cleanup_cmd(rq);
+ sg_free_table_chained(&req->sg_table, true);
+}
+
+static int nvme_rdma_set_sg_null(struct nvme_command *c)
+{
+ struct nvme_keyed_sgl_desc *sg = &c->common.dptr.ksgl;
+
+ sg->addr = 0;
+ put_unaligned_le24(0, sg->length);
+ put_unaligned_le32(0, sg->key);
+ sg->type = NVME_KEY_SGL_FMT_DATA_DESC << 4;
+ return 0;
+}
+
+static int nvme_rdma_map_sg_inline(struct nvme_rdma_queue *queue,
+ struct nvme_rdma_request *req, struct nvme_command *c)
+{
+ struct nvme_sgl_desc *sg = &c->common.dptr.sgl;
+
+ req->sge[1].addr = sg_dma_address(req->sg_table.sgl);
+ req->sge[1].length = sg_dma_len(req->sg_table.sgl);
+ req->sge[1].lkey = queue->device->pd->local_dma_lkey;
+
+ sg->addr = cpu_to_le64(queue->ctrl->ctrl.icdoff);
+ sg->length = cpu_to_le32(sg_dma_len(req->sg_table.sgl));
+ sg->type = (NVME_SGL_FMT_DATA_DESC << 4) | NVME_SGL_FMT_OFFSET;
+
+ req->inline_data = true;
+ req->num_sge++;
+ return 0;
+}
+
+static int nvme_rdma_map_sg_single(struct nvme_rdma_queue *queue,
+ struct nvme_rdma_request *req, struct nvme_command *c)
+{
+ struct nvme_keyed_sgl_desc *sg = &c->common.dptr.ksgl;
+
+ sg->addr = cpu_to_le64(sg_dma_address(req->sg_table.sgl));
+ put_unaligned_le24(sg_dma_len(req->sg_table.sgl), sg->length);
+ put_unaligned_le32(queue->device->pd->unsafe_global_rkey, sg->key);
+ sg->type = NVME_KEY_SGL_FMT_DATA_DESC << 4;
+ return 0;
+}
+
+static int nvme_rdma_map_sg_fr(struct nvme_rdma_queue *queue,
+ struct nvme_rdma_request *req, struct nvme_command *c,
+ int count)
+{
+ struct nvme_keyed_sgl_desc *sg = &c->common.dptr.ksgl;
+ int nr;
+
+ /*
+ * Align the MR to a 4K page size to match the ctrl page size and
+ * the block virtual boundary.
+ */
+ nr = ib_map_mr_sg(req->mr, req->sg_table.sgl, count, NULL, SZ_4K);
+ if (unlikely(nr < count)) {
+ if (nr < 0)
+ return nr;
+ return -EINVAL;
+ }
+
+ ib_update_fast_reg_key(req->mr, ib_inc_rkey(req->mr->rkey));
+
+ req->reg_cqe.done = nvme_rdma_memreg_done;
+ memset(&req->reg_wr, 0, sizeof(req->reg_wr));
+ req->reg_wr.wr.opcode = IB_WR_REG_MR;
+ req->reg_wr.wr.wr_cqe = &req->reg_cqe;
+ req->reg_wr.wr.num_sge = 0;
+ req->reg_wr.mr = req->mr;
+ req->reg_wr.key = req->mr->rkey;
+ req->reg_wr.access = IB_ACCESS_LOCAL_WRITE |
+ IB_ACCESS_REMOTE_READ |
+ IB_ACCESS_REMOTE_WRITE;
+
+ req->mr->need_inval = true;
+
+ sg->addr = cpu_to_le64(req->mr->iova);
+ put_unaligned_le24(req->mr->length, sg->length);
+ put_unaligned_le32(req->mr->rkey, sg->key);
+ sg->type = (NVME_KEY_SGL_FMT_DATA_DESC << 4) |
+ NVME_SGL_FMT_INVALIDATE;
+
+ return 0;
+}
+
+static int nvme_rdma_map_data(struct nvme_rdma_queue *queue,
+ struct request *rq, struct nvme_command *c)
+{
+ struct nvme_rdma_request *req = blk_mq_rq_to_pdu(rq);
+ struct nvme_rdma_device *dev = queue->device;
+ struct ib_device *ibdev = dev->dev;
+ int count, ret;
+
+ req->num_sge = 1;
+ req->inline_data = false;
+ req->mr->need_inval = false;
+ refcount_set(&req->ref, 2); /* send and recv completions */
+
+ c->common.flags |= NVME_CMD_SGL_METABUF;
+
+ if (!blk_rq_bytes(rq))
+ return nvme_rdma_set_sg_null(c);
+
+ req->sg_table.sgl = req->first_sgl;
+ ret = sg_alloc_table_chained(&req->sg_table,
+ blk_rq_nr_phys_segments(rq), req->sg_table.sgl);
+ if (ret)
+ return -ENOMEM;
+
+ req->nents = blk_rq_map_sg(rq->q, rq, req->sg_table.sgl);
+
+ count = ib_dma_map_sg(ibdev, req->sg_table.sgl, req->nents,
+ rq_data_dir(rq) == WRITE ? DMA_TO_DEVICE : DMA_FROM_DEVICE);
+ if (unlikely(count <= 0)) {
+ sg_free_table_chained(&req->sg_table, true);
+ return -EIO;
+ }
+
+ if (count == 1) {
+ if (rq_data_dir(rq) == WRITE && nvme_rdma_queue_idx(queue) &&
+ blk_rq_payload_bytes(rq) <=
+ nvme_rdma_inline_data_size(queue))
+ return nvme_rdma_map_sg_inline(queue, req, c);
+
+ if (dev->pd->flags & IB_PD_UNSAFE_GLOBAL_RKEY)
+ return nvme_rdma_map_sg_single(queue, req, c);
+ }
+
+ return nvme_rdma_map_sg_fr(queue, req, c, count);
+}
+
+static void nvme_rdma_send_done(struct ib_cq *cq, struct ib_wc *wc)
+{
+ struct nvme_rdma_qe *qe =
+ container_of(wc->wr_cqe, struct nvme_rdma_qe, cqe);
+ struct nvme_rdma_request *req =
+ container_of(qe, struct nvme_rdma_request, sqe);
+ struct request *rq = blk_mq_rq_from_pdu(req);
+
+ if (unlikely(wc->status != IB_WC_SUCCESS)) {
+ nvme_rdma_wr_error(cq, wc, "SEND");
+ return;
+ }
+
+ if (refcount_dec_and_test(&req->ref))
+ nvme_end_request(rq, req->status, req->result);
+}
+
+static int nvme_rdma_post_send(struct nvme_rdma_queue *queue,
+ struct nvme_rdma_qe *qe, struct ib_sge *sge, u32 num_sge,
+ struct ib_send_wr *first)
+{
+ struct ib_send_wr wr, *bad_wr;
+ int ret;
+
+ sge->addr = qe->dma;
+ sge->length = sizeof(struct nvme_command),
+ sge->lkey = queue->device->pd->local_dma_lkey;
+
+ wr.next = NULL;
+ wr.wr_cqe = &qe->cqe;
+ wr.sg_list = sge;
+ wr.num_sge = num_sge;
+ wr.opcode = IB_WR_SEND;
+ wr.send_flags = IB_SEND_SIGNALED;
+
+ if (first)
+ first->next = ≀
+ else
+ first = ≀
+
+ ret = ib_post_send(queue->qp, first, &bad_wr);
+ if (unlikely(ret)) {
+ dev_err(queue->ctrl->ctrl.device,
+ "%s failed with error code %d\n", __func__, ret);
+ }
+ return ret;
+}
+
+static int nvme_rdma_post_recv(struct nvme_rdma_queue *queue,
+ struct nvme_rdma_qe *qe)
+{
+ struct ib_recv_wr wr, *bad_wr;
+ struct ib_sge list;
+ int ret;
+
+ list.addr = qe->dma;
+ list.length = sizeof(struct nvme_completion);
+ list.lkey = queue->device->pd->local_dma_lkey;
+
+ qe->cqe.done = nvme_rdma_recv_done;
+
+ wr.next = NULL;
+ wr.wr_cqe = &qe->cqe;
+ wr.sg_list = &list;
+ wr.num_sge = 1;
+
+ ret = ib_post_recv(queue->qp, &wr, &bad_wr);
+ if (unlikely(ret)) {
+ dev_err(queue->ctrl->ctrl.device,
+ "%s failed with error code %d\n", __func__, ret);
+ }
+ return ret;
+}
+
+static struct blk_mq_tags *nvme_rdma_tagset(struct nvme_rdma_queue *queue)
+{
+ u32 queue_idx = nvme_rdma_queue_idx(queue);
+
+ if (queue_idx == 0)
+ return queue->ctrl->admin_tag_set.tags[queue_idx];
+ return queue->ctrl->tag_set.tags[queue_idx - 1];
+}
+
+static void nvme_rdma_async_done(struct ib_cq *cq, struct ib_wc *wc)
+{
+ if (unlikely(wc->status != IB_WC_SUCCESS))
+ nvme_rdma_wr_error(cq, wc, "ASYNC");
+}
+
+static void nvme_rdma_submit_async_event(struct nvme_ctrl *arg, int aer_idx)
+{
+ struct nvme_rdma_ctrl *ctrl = to_rdma_ctrl(arg);
+ struct nvme_rdma_queue *queue = &ctrl->queues[0];
+ struct ib_device *dev = queue->device->dev;
+ struct nvme_rdma_qe *sqe = &ctrl->async_event_sqe;
+ struct nvme_command *cmd = sqe->data;
+ struct ib_sge sge;
+ int ret;
+
+ if (WARN_ON_ONCE(aer_idx != 0))
+ return;
+
+ ib_dma_sync_single_for_cpu(dev, sqe->dma, sizeof(*cmd), DMA_TO_DEVICE);
+
+ memset(cmd, 0, sizeof(*cmd));
+ cmd->common.opcode = nvme_admin_async_event;
+ cmd->common.command_id = NVME_RDMA_AQ_BLKMQ_DEPTH;
+ cmd->common.flags |= NVME_CMD_SGL_METABUF;
+ nvme_rdma_set_sg_null(cmd);
+
+ sqe->cqe.done = nvme_rdma_async_done;
+
+ ib_dma_sync_single_for_device(dev, sqe->dma, sizeof(*cmd),
+ DMA_TO_DEVICE);
+
+ ret = nvme_rdma_post_send(queue, sqe, &sge, 1, NULL);
+ WARN_ON_ONCE(ret);
+}
+
+static int nvme_rdma_process_nvme_rsp(struct nvme_rdma_queue *queue,
+ struct nvme_completion *cqe, struct ib_wc *wc, int tag)
+{
+ struct request *rq;
+ struct nvme_rdma_request *req;
+ int ret = 0;
+
+ rq = blk_mq_tag_to_rq(nvme_rdma_tagset(queue), cqe->command_id);
+ if (!rq) {
+ dev_err(queue->ctrl->ctrl.device,
+ "tag 0x%x on QP %#x not found\n",
+ cqe->command_id, queue->qp->qp_num);
+ nvme_rdma_error_recovery(queue->ctrl);
+ return ret;
+ }
+ req = blk_mq_rq_to_pdu(rq);
+
+ req->status = cqe->status;
+ req->result = cqe->result;
+
+ if ((wc->wc_flags & IB_WC_WITH_INVALIDATE) &&
+ wc->ex.invalidate_rkey == req->mr->rkey)
+ req->mr->need_inval = false;
+
+ if (refcount_dec_and_test(&req->ref)) {
+ if (rq->tag == tag)
+ ret = 1;
+ nvme_end_request(rq, req->status, req->result);
+ }
+
+ return ret;
+}
+
+static int __nvme_rdma_recv_done(struct ib_cq *cq, struct ib_wc *wc, int tag)
+{
+ struct nvme_rdma_qe *qe =
+ container_of(wc->wr_cqe, struct nvme_rdma_qe, cqe);
+ struct nvme_rdma_queue *queue = cq->cq_context;
+ struct ib_device *ibdev = queue->device->dev;
+ struct nvme_completion *cqe = qe->data;
+ const size_t len = sizeof(struct nvme_completion);
+ int ret = 0;
+
+ if (unlikely(wc->status != IB_WC_SUCCESS)) {
+ nvme_rdma_wr_error(cq, wc, "RECV");
+ return 0;
+ }
+
+ ib_dma_sync_single_for_cpu(ibdev, qe->dma, len, DMA_FROM_DEVICE);
+ /*
+ * AEN requests are special as they don't time out and can
+ * survive any kind of queue freeze and often don't respond to
+ * aborts. We don't even bother to allocate a struct request
+ * for them but rather special case them here.
+ */
+ if (unlikely(nvme_rdma_queue_idx(queue) == 0 &&
+ cqe->command_id >= NVME_RDMA_AQ_BLKMQ_DEPTH))
+ nvme_complete_async_event(&queue->ctrl->ctrl, cqe->status,
+ &cqe->result);
+ else
+ ret = nvme_rdma_process_nvme_rsp(queue, cqe, wc, tag);
+ ib_dma_sync_single_for_device(ibdev, qe->dma, len, DMA_FROM_DEVICE);
+
+ nvme_rdma_post_recv(queue, qe);
+ return ret;
+}
+
+static void nvme_rdma_recv_done(struct ib_cq *cq, struct ib_wc *wc)
+{
+ __nvme_rdma_recv_done(cq, wc, -1);
+}
+
+static int nvme_rdma_conn_established(struct nvme_rdma_queue *queue)
+{
+ int ret, i;
+
+ for (i = 0; i < queue->queue_size; i++) {
+ ret = nvme_rdma_post_recv(queue, &queue->rsp_ring[i]);
+ if (ret)
+ goto out_destroy_queue_ib;
+ }
+
+ return 0;
+
+out_destroy_queue_ib:
+ nvme_rdma_destroy_queue_ib(queue);
+ return ret;
+}
+
+static int nvme_rdma_conn_rejected(struct nvme_rdma_queue *queue,
+ struct rdma_cm_event *ev)
+{
+ struct rdma_cm_id *cm_id = queue->cm_id;
+ int status = ev->status;
+ const char *rej_msg;
+ const struct nvme_rdma_cm_rej *rej_data;
+ u8 rej_data_len;
+
+ rej_msg = rdma_reject_msg(cm_id, status);
+ rej_data = rdma_consumer_reject_data(cm_id, ev, &rej_data_len);
+
+ if (rej_data && rej_data_len >= sizeof(u16)) {
+ u16 sts = le16_to_cpu(rej_data->sts);
+
+ dev_err(queue->ctrl->ctrl.device,
+ "Connect rejected: status %d (%s) nvme status %d (%s).\n",
+ status, rej_msg, sts, nvme_rdma_cm_msg(sts));
+ } else {
+ dev_err(queue->ctrl->ctrl.device,
+ "Connect rejected: status %d (%s).\n", status, rej_msg);
+ }
+
+ return -ECONNRESET;
+}
+
+static int nvme_rdma_addr_resolved(struct nvme_rdma_queue *queue)
+{
+ int ret;
+
+ ret = nvme_rdma_create_queue_ib(queue);
+ if (ret)
+ return ret;
+
+ ret = rdma_resolve_route(queue->cm_id, NVME_RDMA_CONNECT_TIMEOUT_MS);
+ if (ret) {
+ dev_err(queue->ctrl->ctrl.device,
+ "rdma_resolve_route failed (%d).\n",
+ queue->cm_error);
+ goto out_destroy_queue;
+ }
+
+ return 0;
+
+out_destroy_queue:
+ nvme_rdma_destroy_queue_ib(queue);
+ return ret;
+}
+
+static int nvme_rdma_route_resolved(struct nvme_rdma_queue *queue)
+{
+ struct nvme_rdma_ctrl *ctrl = queue->ctrl;
+ struct rdma_conn_param param = { };
+ struct nvme_rdma_cm_req priv = { };
+ int ret;
+
+ param.qp_num = queue->qp->qp_num;
+ param.flow_control = 1;
+
+ param.responder_resources = queue->device->dev->attrs.max_qp_rd_atom;
+ /* maximum retry count */
+ param.retry_count = 7;
+ param.rnr_retry_count = 7;
+ param.private_data = &priv;
+ param.private_data_len = sizeof(priv);
+
+ priv.recfmt = cpu_to_le16(NVME_RDMA_CM_FMT_1_0);
+ priv.qid = cpu_to_le16(nvme_rdma_queue_idx(queue));
+ /*
+ * set the admin queue depth to the minimum size
+ * specified by the Fabrics standard.
+ */
+ if (priv.qid == 0) {
+ priv.hrqsize = cpu_to_le16(NVME_AQ_DEPTH);
+ priv.hsqsize = cpu_to_le16(NVME_AQ_DEPTH - 1);
+ } else {
+ /*
+ * current interpretation of the fabrics spec
+ * is at minimum you make hrqsize sqsize+1, or a
+ * 1's based representation of sqsize.
+ */
+ priv.hrqsize = cpu_to_le16(queue->queue_size);
+ priv.hsqsize = cpu_to_le16(queue->ctrl->ctrl.sqsize);
+ }
+
+ ret = rdma_connect(queue->cm_id, ¶m);
+ if (ret) {
+ dev_err(ctrl->ctrl.device,
+ "rdma_connect failed (%d).\n", ret);
+ goto out_destroy_queue_ib;
+ }
+
+ return 0;
+
+out_destroy_queue_ib:
+ nvme_rdma_destroy_queue_ib(queue);
+ return ret;
+}
+
+static int nvme_rdma_cm_handler(struct rdma_cm_id *cm_id,
+ struct rdma_cm_event *ev)
+{
+ struct nvme_rdma_queue *queue = cm_id->context;
+ int cm_error = 0;
+
+ dev_dbg(queue->ctrl->ctrl.device, "%s (%d): status %d id %p\n",
+ rdma_event_msg(ev->event), ev->event,
+ ev->status, cm_id);
+
+ switch (ev->event) {
+ case RDMA_CM_EVENT_ADDR_RESOLVED:
+ cm_error = nvme_rdma_addr_resolved(queue);
+ break;
+ case RDMA_CM_EVENT_ROUTE_RESOLVED:
+ cm_error = nvme_rdma_route_resolved(queue);
+ break;
+ case RDMA_CM_EVENT_ESTABLISHED:
+ queue->cm_error = nvme_rdma_conn_established(queue);
+ /* complete cm_done regardless of success/failure */
+ complete(&queue->cm_done);
+ return 0;
+ case RDMA_CM_EVENT_REJECTED:
+ nvme_rdma_destroy_queue_ib(queue);
+ cm_error = nvme_rdma_conn_rejected(queue, ev);
+ break;
+ case RDMA_CM_EVENT_ROUTE_ERROR:
+ case RDMA_CM_EVENT_CONNECT_ERROR:
+ case RDMA_CM_EVENT_UNREACHABLE:
+ nvme_rdma_destroy_queue_ib(queue);
+ case RDMA_CM_EVENT_ADDR_ERROR:
+ dev_dbg(queue->ctrl->ctrl.device,
+ "CM error event %d\n", ev->event);
+ cm_error = -ECONNRESET;
+ break;
+ case RDMA_CM_EVENT_DISCONNECTED:
+ case RDMA_CM_EVENT_ADDR_CHANGE:
+ case RDMA_CM_EVENT_TIMEWAIT_EXIT:
+ dev_dbg(queue->ctrl->ctrl.device,
+ "disconnect received - connection closed\n");
+ nvme_rdma_error_recovery(queue->ctrl);
+ break;
+ case RDMA_CM_EVENT_DEVICE_REMOVAL:
+ /* device removal is handled via the ib_client API */
+ break;
+ default:
+ dev_err(queue->ctrl->ctrl.device,
+ "Unexpected RDMA CM event (%d)\n", ev->event);
+ nvme_rdma_error_recovery(queue->ctrl);
+ break;
+ }
+
+ if (cm_error) {
+ queue->cm_error = cm_error;
+ complete(&queue->cm_done);
+ }
+
+ return 0;
+}
+
+static enum blk_eh_timer_return
+nvme_rdma_timeout(struct request *rq, bool reserved)
+{
+ struct nvme_rdma_request *req = blk_mq_rq_to_pdu(rq);
+
+ /* queue error recovery */
+ nvme_rdma_error_recovery(req->queue->ctrl);
+
+ /* fail with DNR on cmd timeout */
+ nvme_req(rq)->status = NVME_SC_ABORT_REQ | NVME_SC_DNR;
+
+ return BLK_EH_HANDLED;
+}
+
+/*
+ * We cannot accept any other command until the Connect command has completed.
+ */
+static inline blk_status_t
+nvme_rdma_is_ready(struct nvme_rdma_queue *queue, struct request *rq)
+{
+ if (unlikely(!test_bit(NVME_RDMA_Q_LIVE, &queue->flags)))
+ return nvmf_check_init_req(&queue->ctrl->ctrl, rq);
+ return BLK_STS_OK;
+}
+
+static blk_status_t nvme_rdma_queue_rq(struct blk_mq_hw_ctx *hctx,
+ const struct blk_mq_queue_data *bd)
+{
+ struct nvme_ns *ns = hctx->queue->queuedata;
+ struct nvme_rdma_queue *queue = hctx->driver_data;
+ struct request *rq = bd->rq;
+ struct nvme_rdma_request *req = blk_mq_rq_to_pdu(rq);
+ struct nvme_rdma_qe *sqe = &req->sqe;
+ struct nvme_command *c = sqe->data;
+ struct ib_device *dev;
+ blk_status_t ret;
+ int err;
+
+ WARN_ON_ONCE(rq->tag < 0);
+
+ ret = nvme_rdma_is_ready(queue, rq);
+ if (unlikely(ret))
+ return ret;
+
+ dev = queue->device->dev;
+ ib_dma_sync_single_for_cpu(dev, sqe->dma,
+ sizeof(struct nvme_command), DMA_TO_DEVICE);
+
+ ret = nvme_setup_cmd(ns, rq, c);
+ if (ret)
+ return ret;
+
+ blk_mq_start_request(rq);
+
+ err = nvme_rdma_map_data(queue, rq, c);
+ if (unlikely(err < 0)) {
+ dev_err(queue->ctrl->ctrl.device,
+ "Failed to map data (%d)\n", err);
+ nvme_cleanup_cmd(rq);
+ goto err;
+ }
+
+ sqe->cqe.done = nvme_rdma_send_done;
+
+ ib_dma_sync_single_for_device(dev, sqe->dma,
+ sizeof(struct nvme_command), DMA_TO_DEVICE);
+
+ err = nvme_rdma_post_send(queue, sqe, req->sge, req->num_sge,
+ req->mr->need_inval ? &req->reg_wr.wr : NULL);
+ if (unlikely(err)) {
+ nvme_rdma_unmap_data(queue, rq);
+ goto err;
+ }
+
+ return BLK_STS_OK;
+err:
+ if (err == -ENOMEM || err == -EAGAIN)
+ return BLK_STS_RESOURCE;
+ return BLK_STS_IOERR;
+}
+
+static int nvme_rdma_poll(struct blk_mq_hw_ctx *hctx, unsigned int tag)
+{
+ struct nvme_rdma_queue *queue = hctx->driver_data;
+ struct ib_cq *cq = queue->ib_cq;
+ struct ib_wc wc;
+ int found = 0;
+
+ while (ib_poll_cq(cq, 1, &wc) > 0) {
+ struct ib_cqe *cqe = wc.wr_cqe;
+
+ if (cqe) {
+ if (cqe->done == nvme_rdma_recv_done)
+ found |= __nvme_rdma_recv_done(cq, &wc, tag);
+ else
+ cqe->done(cq, &wc);
+ }
+ }
+
+ return found;
+}
+
+static void nvme_rdma_complete_rq(struct request *rq)
+{
+ struct nvme_rdma_request *req = blk_mq_rq_to_pdu(rq);
+
+ nvme_rdma_unmap_data(req->queue, rq);
+ nvme_complete_rq(rq);
+}
+
+static int nvme_rdma_map_queues(struct blk_mq_tag_set *set)
+{
+ struct nvme_rdma_ctrl *ctrl = set->driver_data;
+
+ return blk_mq_rdma_map_queues(set, ctrl->device->dev, 0);
+}
+
+static const struct blk_mq_ops nvme_rdma_mq_ops = {
+ .queue_rq = nvme_rdma_queue_rq,
+ .complete = nvme_rdma_complete_rq,
+ .init_request = nvme_rdma_init_request,
+ .exit_request = nvme_rdma_exit_request,
+ .init_hctx = nvme_rdma_init_hctx,
+ .poll = nvme_rdma_poll,
+ .timeout = nvme_rdma_timeout,
+ .map_queues = nvme_rdma_map_queues,
+};
+
+static const struct blk_mq_ops nvme_rdma_admin_mq_ops = {
+ .queue_rq = nvme_rdma_queue_rq,
+ .complete = nvme_rdma_complete_rq,
+ .init_request = nvme_rdma_init_request,
+ .exit_request = nvme_rdma_exit_request,
+ .init_hctx = nvme_rdma_init_admin_hctx,
+ .timeout = nvme_rdma_timeout,
+};
+
+static void nvme_rdma_shutdown_ctrl(struct nvme_rdma_ctrl *ctrl, bool shutdown)
+{
+ cancel_work_sync(&ctrl->err_work);
+ cancel_delayed_work_sync(&ctrl->reconnect_work);
+
+ if (ctrl->ctrl.queue_count > 1) {
+ nvme_stop_queues(&ctrl->ctrl);
+ blk_mq_tagset_busy_iter(&ctrl->tag_set,
+ nvme_cancel_request, &ctrl->ctrl);
+ if (shutdown)
+ nvme_start_queues(&ctrl->ctrl);
+ nvme_rdma_destroy_io_queues(ctrl, shutdown);
+ }
+
+ if (shutdown)
+ nvme_shutdown_ctrl(&ctrl->ctrl);
+ else
+ nvme_disable_ctrl(&ctrl->ctrl, ctrl->ctrl.cap);
+
+ blk_mq_quiesce_queue(ctrl->ctrl.admin_q);
+ blk_mq_tagset_busy_iter(&ctrl->admin_tag_set,
+ nvme_cancel_request, &ctrl->ctrl);
+ blk_mq_unquiesce_queue(ctrl->ctrl.admin_q);
+ nvme_rdma_destroy_admin_queue(ctrl, shutdown);
+}
+
+static void nvme_rdma_remove_ctrl(struct nvme_rdma_ctrl *ctrl)
+{
+ nvme_remove_namespaces(&ctrl->ctrl);
+ nvme_rdma_shutdown_ctrl(ctrl, true);
+ nvme_uninit_ctrl(&ctrl->ctrl);
+ nvme_put_ctrl(&ctrl->ctrl);
+}
+
+static void nvme_rdma_del_ctrl_work(struct work_struct *work)
+{
+ struct nvme_rdma_ctrl *ctrl = container_of(work,
+ struct nvme_rdma_ctrl, delete_work);
+
+ nvme_stop_ctrl(&ctrl->ctrl);
+ nvme_rdma_remove_ctrl(ctrl);
+}
+
+static int __nvme_rdma_del_ctrl(struct nvme_rdma_ctrl *ctrl)
+{
+ if (!nvme_change_ctrl_state(&ctrl->ctrl, NVME_CTRL_DELETING))
+ return -EBUSY;
+
+ if (!queue_work(nvme_wq, &ctrl->delete_work))
+ return -EBUSY;
+
+ return 0;
+}
+
+static int nvme_rdma_del_ctrl(struct nvme_ctrl *nctrl)
+{
+ struct nvme_rdma_ctrl *ctrl = to_rdma_ctrl(nctrl);
+ int ret = 0;
+
+ /*
+ * Keep a reference until all work is flushed since
+ * __nvme_rdma_del_ctrl can free the ctrl mem
+ */
+ if (!kref_get_unless_zero(&ctrl->ctrl.kref))
+ return -EBUSY;
+ ret = __nvme_rdma_del_ctrl(ctrl);
+ if (!ret)
+ flush_work(&ctrl->delete_work);
+ nvme_put_ctrl(&ctrl->ctrl);
+ return ret;
+}
+
+static void nvme_rdma_reset_ctrl_work(struct work_struct *work)
+{
+ struct nvme_rdma_ctrl *ctrl =
+ container_of(work, struct nvme_rdma_ctrl, ctrl.reset_work);
+ int ret;
+ bool changed;
+
+ nvme_stop_ctrl(&ctrl->ctrl);
+ nvme_rdma_shutdown_ctrl(ctrl, false);
+
+ ret = nvme_rdma_configure_admin_queue(ctrl, false);
+ if (ret)
+ goto out_fail;
+
+ if (ctrl->ctrl.queue_count > 1) {
+ ret = nvme_rdma_configure_io_queues(ctrl, false);
+ if (ret)
+ goto out_fail;
+ }
+
+ changed = nvme_change_ctrl_state(&ctrl->ctrl, NVME_CTRL_LIVE);
+ WARN_ON_ONCE(!changed);
+
+ nvme_start_ctrl(&ctrl->ctrl);
+
+ return;
+
+out_fail:
+ dev_warn(ctrl->ctrl.device, "Removing after reset failure\n");
+ nvme_rdma_remove_ctrl(ctrl);
+}
+
+static const struct nvme_ctrl_ops nvme_rdma_ctrl_ops = {
+ .name = "rdma",
+ .module = THIS_MODULE,
+ .flags = NVME_F_FABRICS,
+ .reg_read32 = nvmf_reg_read32,
+ .reg_read64 = nvmf_reg_read64,
+ .reg_write32 = nvmf_reg_write32,
+ .free_ctrl = nvme_rdma_free_ctrl,
+ .submit_async_event = nvme_rdma_submit_async_event,
+ .delete_ctrl = nvme_rdma_del_ctrl,
+ .get_address = nvmf_get_address,
+};
+
+static struct nvme_ctrl *nvme_rdma_create_ctrl(struct device *dev,
+ struct nvmf_ctrl_options *opts)
+{
+ struct nvme_rdma_ctrl *ctrl;
+ int ret;
+ bool changed;
+ char *port;
+
+ ctrl = kzalloc(sizeof(*ctrl), GFP_KERNEL);
+ if (!ctrl)
+ return ERR_PTR(-ENOMEM);
+ ctrl->ctrl.opts = opts;
+ INIT_LIST_HEAD(&ctrl->list);
+
+ if (opts->mask & NVMF_OPT_TRSVCID)
+ port = opts->trsvcid;
+ else
+ port = __stringify(NVME_RDMA_IP_PORT);
+
+ ret = inet_pton_with_scope(&init_net, AF_UNSPEC,
+ opts->traddr, port, &ctrl->addr);
+ if (ret) {
+ pr_err("malformed address passed: %s:%s\n", opts->traddr, port);
+ goto out_free_ctrl;
+ }
+
+ if (opts->mask & NVMF_OPT_HOST_TRADDR) {
+ ret = inet_pton_with_scope(&init_net, AF_UNSPEC,
+ opts->host_traddr, NULL, &ctrl->src_addr);
+ if (ret) {
+ pr_err("malformed src address passed: %s\n",
+ opts->host_traddr);
+ goto out_free_ctrl;
+ }
+ }
+
+ ret = nvme_init_ctrl(&ctrl->ctrl, dev, &nvme_rdma_ctrl_ops,
+ 0 /* no quirks, we're perfect! */);
+ if (ret)
+ goto out_free_ctrl;
+
+ INIT_DELAYED_WORK(&ctrl->reconnect_work,
+ nvme_rdma_reconnect_ctrl_work);
+ INIT_WORK(&ctrl->err_work, nvme_rdma_error_recovery_work);
+ INIT_WORK(&ctrl->delete_work, nvme_rdma_del_ctrl_work);
+ INIT_WORK(&ctrl->ctrl.reset_work, nvme_rdma_reset_ctrl_work);
+
+ ctrl->ctrl.queue_count = opts->nr_io_queues + 1; /* +1 for admin queue */
+ ctrl->ctrl.sqsize = opts->queue_size - 1;
+ ctrl->ctrl.kato = opts->kato;
+
+ ret = -ENOMEM;
+ ctrl->queues = kcalloc(ctrl->ctrl.queue_count, sizeof(*ctrl->queues),
+ GFP_KERNEL);
+ if (!ctrl->queues)
+ goto out_uninit_ctrl;
+
+ ret = nvme_rdma_configure_admin_queue(ctrl, true);
+ if (ret)
+ goto out_kfree_queues;
+
+ /* sanity check icdoff */
+ if (ctrl->ctrl.icdoff) {
+ dev_err(ctrl->ctrl.device, "icdoff is not supported!\n");
+ ret = -EINVAL;
+ goto out_remove_admin_queue;
+ }
+
+ /* sanity check keyed sgls */
+ if (!(ctrl->ctrl.sgls & (1 << 20))) {
+ dev_err(ctrl->ctrl.device, "Mandatory keyed sgls are not support\n");
+ ret = -EINVAL;
+ goto out_remove_admin_queue;
+ }
+
+ if (opts->queue_size > ctrl->ctrl.maxcmd) {
+ /* warn if maxcmd is lower than queue_size */
+ dev_warn(ctrl->ctrl.device,
+ "queue_size %zu > ctrl maxcmd %u, clamping down\n",
+ opts->queue_size, ctrl->ctrl.maxcmd);
+ opts->queue_size = ctrl->ctrl.maxcmd;
+ }
+
+ if (opts->queue_size > ctrl->ctrl.sqsize + 1) {
+ /* warn if sqsize is lower than queue_size */
+ dev_warn(ctrl->ctrl.device,
+ "queue_size %zu > ctrl sqsize %u, clamping down\n",
+ opts->queue_size, ctrl->ctrl.sqsize + 1);
+ opts->queue_size = ctrl->ctrl.sqsize + 1;
+ }
+
+ if (opts->nr_io_queues) {
+ ret = nvme_rdma_configure_io_queues(ctrl, true);
+ if (ret)
+ goto out_remove_admin_queue;
+ }
+
+ changed = nvme_change_ctrl_state(&ctrl->ctrl, NVME_CTRL_LIVE);
+ WARN_ON_ONCE(!changed);
+
+ dev_info(ctrl->ctrl.device, "new ctrl: NQN \"%s\", addr %pISpcs\n",
+ ctrl->ctrl.opts->subsysnqn, &ctrl->addr);
+
+ kref_get(&ctrl->ctrl.kref);
+
+ mutex_lock(&nvme_rdma_ctrl_mutex);
+ list_add_tail(&ctrl->list, &nvme_rdma_ctrl_list);
+ mutex_unlock(&nvme_rdma_ctrl_mutex);
+
+ nvme_start_ctrl(&ctrl->ctrl);
+
+ return &ctrl->ctrl;
+
+out_remove_admin_queue:
+ nvme_rdma_destroy_admin_queue(ctrl, true);
+out_kfree_queues:
+ kfree(ctrl->queues);
+out_uninit_ctrl:
+ nvme_uninit_ctrl(&ctrl->ctrl);
+ nvme_put_ctrl(&ctrl->ctrl);
+ if (ret > 0)
+ ret = -EIO;
+ return ERR_PTR(ret);
+out_free_ctrl:
+ kfree(ctrl);
+ return ERR_PTR(ret);
+}
+
+static struct nvmf_transport_ops nvme_rdma_transport = {
+ .name = "rdma",
+ .required_opts = NVMF_OPT_TRADDR,
+ .allowed_opts = NVMF_OPT_TRSVCID | NVMF_OPT_RECONNECT_DELAY |
+ NVMF_OPT_HOST_TRADDR | NVMF_OPT_CTRL_LOSS_TMO,
+ .create_ctrl = nvme_rdma_create_ctrl,
+};
+
+static void nvme_rdma_remove_one(struct ib_device *ib_device, void *client_data)
+{
+ struct nvme_rdma_ctrl *ctrl;
+
+ /* Delete all controllers using this device */
+ mutex_lock(&nvme_rdma_ctrl_mutex);
+ list_for_each_entry(ctrl, &nvme_rdma_ctrl_list, list) {
+ if (ctrl->device->dev != ib_device)
+ continue;
+ dev_info(ctrl->ctrl.device,
+ "Removing ctrl: NQN \"%s\", addr %pISp\n",
+ ctrl->ctrl.opts->subsysnqn, &ctrl->addr);
+ __nvme_rdma_del_ctrl(ctrl);
+ }
+ mutex_unlock(&nvme_rdma_ctrl_mutex);
+
+ flush_workqueue(nvme_wq);
+}
+
+static struct ib_client nvme_rdma_ib_client = {
+ .name = "nvme_rdma",
+ .remove = nvme_rdma_remove_one
+};
+
+static int __init nvme_rdma_init_module(void)
+{
+ int ret;
+
+ ret = ib_register_client(&nvme_rdma_ib_client);
+ if (ret)
+ return ret;
+
+ ret = nvmf_register_transport(&nvme_rdma_transport);
+ if (ret)
+ goto err_unreg_client;
+
+ return 0;
+
+err_unreg_client:
+ ib_unregister_client(&nvme_rdma_ib_client);
+ return ret;
+}
+
+static void __exit nvme_rdma_cleanup_module(void)
+{
+ nvmf_unregister_transport(&nvme_rdma_transport);
+ ib_unregister_client(&nvme_rdma_ib_client);
+}
+
+module_init(nvme_rdma_init_module);
+module_exit(nvme_rdma_cleanup_module);
+
+MODULE_LICENSE("GPL v2");
diff --git a/src/kernel/linux/v4.14/drivers/nvme/target/Kconfig b/src/kernel/linux/v4.14/drivers/nvme/target/Kconfig
new file mode 100644
index 0000000..48d20c2
--- /dev/null
+++ b/src/kernel/linux/v4.14/drivers/nvme/target/Kconfig
@@ -0,0 +1,60 @@
+
+config NVME_TARGET
+ tristate "NVMe Target support"
+ depends on BLOCK
+ depends on CONFIGFS_FS
+ help
+ This enabled target side support for the NVMe protocol, that is
+ it allows the Linux kernel to implement NVMe subsystems and
+ controllers and export Linux block devices as NVMe namespaces.
+ You need to select at least one of the transports below to make this
+ functionality useful.
+
+ To configure the NVMe target you probably want to use the nvmetcli
+ tool from http://git.infradead.org/users/hch/nvmetcli.git.
+
+config NVME_TARGET_LOOP
+ tristate "NVMe loopback device support"
+ depends on NVME_TARGET
+ select NVME_CORE
+ select NVME_FABRICS
+ select SG_POOL
+ help
+ This enables the NVMe loopback device support, which can be useful
+ to test NVMe host and target side features.
+
+ If unsure, say N.
+
+config NVME_TARGET_RDMA
+ tristate "NVMe over Fabrics RDMA target support"
+ depends on INFINIBAND && INFINIBAND_ADDR_TRANS
+ depends on NVME_TARGET
+ help
+ This enables the NVMe RDMA target support, which allows exporting NVMe
+ devices over RDMA.
+
+ If unsure, say N.
+
+config NVME_TARGET_FC
+ tristate "NVMe over Fabrics FC target driver"
+ depends on NVME_TARGET
+ depends on HAS_DMA
+ help
+ This enables the NVMe FC target support, which allows exporting NVMe
+ devices over FC.
+
+ If unsure, say N.
+
+config NVME_TARGET_FCLOOP
+ tristate "NVMe over Fabrics FC Transport Loopback Test driver"
+ depends on NVME_TARGET
+ select NVME_CORE
+ select NVME_FABRICS
+ select SG_POOL
+ depends on NVME_FC
+ depends on NVME_TARGET_FC
+ help
+ This enables the NVMe FC loopback test support, which can be useful
+ to test NVMe-FC transport interfaces.
+
+ If unsure, say N.
diff --git a/src/kernel/linux/v4.14/drivers/nvme/target/Makefile b/src/kernel/linux/v4.14/drivers/nvme/target/Makefile
new file mode 100644
index 0000000..4882501
--- /dev/null
+++ b/src/kernel/linux/v4.14/drivers/nvme/target/Makefile
@@ -0,0 +1,14 @@
+# SPDX-License-Identifier: GPL-2.0
+
+obj-$(CONFIG_NVME_TARGET) += nvmet.o
+obj-$(CONFIG_NVME_TARGET_LOOP) += nvme-loop.o
+obj-$(CONFIG_NVME_TARGET_RDMA) += nvmet-rdma.o
+obj-$(CONFIG_NVME_TARGET_FC) += nvmet-fc.o
+obj-$(CONFIG_NVME_TARGET_FCLOOP) += nvme-fcloop.o
+
+nvmet-y += core.o configfs.o admin-cmd.o io-cmd.o fabrics-cmd.o \
+ discovery.o
+nvme-loop-y += loop.o
+nvmet-rdma-y += rdma.o
+nvmet-fc-y += fc.o
+nvme-fcloop-y += fcloop.o
diff --git a/src/kernel/linux/v4.14/drivers/nvme/target/admin-cmd.c b/src/kernel/linux/v4.14/drivers/nvme/target/admin-cmd.c
new file mode 100644
index 0000000..0e94fd7
--- /dev/null
+++ b/src/kernel/linux/v4.14/drivers/nvme/target/admin-cmd.c
@@ -0,0 +1,619 @@
+/*
+ * NVMe admin command implementation.
+ * Copyright (c) 2015-2016 HGST, a Western Digital Company.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ */
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+#include <linux/module.h>
+#include <linux/rculist.h>
+
+#include <generated/utsrelease.h>
+#include <asm/unaligned.h>
+#include "nvmet.h"
+
+u32 nvmet_get_log_page_len(struct nvme_command *cmd)
+{
+ u32 len = le16_to_cpu(cmd->get_log_page.numdu);
+
+ len <<= 16;
+ len += le16_to_cpu(cmd->get_log_page.numdl);
+ /* NUMD is a 0's based value */
+ len += 1;
+ len *= sizeof(u32);
+
+ return len;
+}
+
+static u16 nvmet_get_smart_log_nsid(struct nvmet_req *req,
+ struct nvme_smart_log *slog)
+{
+ u16 status;
+ struct nvmet_ns *ns;
+ u64 host_reads, host_writes, data_units_read, data_units_written;
+
+ status = NVME_SC_SUCCESS;
+ ns = nvmet_find_namespace(req->sq->ctrl, req->cmd->get_log_page.nsid);
+ if (!ns) {
+ status = NVME_SC_INVALID_NS;
+ pr_err("nvmet : Could not find namespace id : %d\n",
+ le32_to_cpu(req->cmd->get_log_page.nsid));
+ goto out;
+ }
+
+ host_reads = part_stat_read(ns->bdev->bd_part, ios[READ]);
+ data_units_read = DIV_ROUND_UP(part_stat_read(ns->bdev->bd_part,
+ sectors[READ]), 1000);
+ host_writes = part_stat_read(ns->bdev->bd_part, ios[WRITE]);
+ data_units_written = DIV_ROUND_UP(part_stat_read(ns->bdev->bd_part,
+ sectors[WRITE]), 1000);
+
+ put_unaligned_le64(host_reads, &slog->host_reads[0]);
+ put_unaligned_le64(data_units_read, &slog->data_units_read[0]);
+ put_unaligned_le64(host_writes, &slog->host_writes[0]);
+ put_unaligned_le64(data_units_written, &slog->data_units_written[0]);
+ nvmet_put_namespace(ns);
+out:
+ return status;
+}
+
+static u16 nvmet_get_smart_log_all(struct nvmet_req *req,
+ struct nvme_smart_log *slog)
+{
+ u16 status;
+ u64 host_reads = 0, host_writes = 0;
+ u64 data_units_read = 0, data_units_written = 0;
+ struct nvmet_ns *ns;
+ struct nvmet_ctrl *ctrl;
+
+ status = NVME_SC_SUCCESS;
+ ctrl = req->sq->ctrl;
+
+ rcu_read_lock();
+ list_for_each_entry_rcu(ns, &ctrl->subsys->namespaces, dev_link) {
+ host_reads += part_stat_read(ns->bdev->bd_part, ios[READ]);
+ data_units_read += DIV_ROUND_UP(
+ part_stat_read(ns->bdev->bd_part, sectors[READ]), 1000);
+ host_writes += part_stat_read(ns->bdev->bd_part, ios[WRITE]);
+ data_units_written += DIV_ROUND_UP(
+ part_stat_read(ns->bdev->bd_part, sectors[WRITE]), 1000);
+
+ }
+ rcu_read_unlock();
+
+ put_unaligned_le64(host_reads, &slog->host_reads[0]);
+ put_unaligned_le64(data_units_read, &slog->data_units_read[0]);
+ put_unaligned_le64(host_writes, &slog->host_writes[0]);
+ put_unaligned_le64(data_units_written, &slog->data_units_written[0]);
+
+ return status;
+}
+
+static u16 nvmet_get_smart_log(struct nvmet_req *req,
+ struct nvme_smart_log *slog)
+{
+ u16 status;
+
+ WARN_ON(req == NULL || slog == NULL);
+ if (req->cmd->get_log_page.nsid == cpu_to_le32(NVME_NSID_ALL))
+ status = nvmet_get_smart_log_all(req, slog);
+ else
+ status = nvmet_get_smart_log_nsid(req, slog);
+ return status;
+}
+
+static void nvmet_execute_get_log_page(struct nvmet_req *req)
+{
+ struct nvme_smart_log *smart_log;
+ size_t data_len = nvmet_get_log_page_len(req->cmd);
+ void *buf;
+ u16 status = 0;
+
+ buf = kzalloc(data_len, GFP_KERNEL);
+ if (!buf) {
+ status = NVME_SC_INTERNAL;
+ goto out;
+ }
+
+ switch (req->cmd->get_log_page.lid) {
+ case NVME_LOG_ERROR:
+ /*
+ * We currently never set the More bit in the status field,
+ * so all error log entries are invalid and can be zeroed out.
+ * This is called a minum viable implementation (TM) of this
+ * mandatory log page.
+ */
+ break;
+ case NVME_LOG_SMART:
+ /*
+ * XXX: fill out actual smart log
+ *
+ * We might have a hard time coming up with useful values for
+ * many of the fields, and even when we have useful data
+ * available (e.g. units or commands read/written) those aren't
+ * persistent over power loss.
+ */
+ if (data_len != sizeof(*smart_log)) {
+ status = NVME_SC_INTERNAL;
+ goto err;
+ }
+ smart_log = buf;
+ status = nvmet_get_smart_log(req, smart_log);
+ if (status) {
+ memset(buf, '\0', data_len);
+ goto err;
+ }
+ break;
+ case NVME_LOG_FW_SLOT:
+ /*
+ * We only support a single firmware slot which always is
+ * active, so we can zero out the whole firmware slot log and
+ * still claim to fully implement this mandatory log page.
+ */
+ break;
+ default:
+ BUG();
+ }
+
+ status = nvmet_copy_to_sgl(req, 0, buf, data_len);
+
+err:
+ kfree(buf);
+out:
+ nvmet_req_complete(req, status);
+}
+
+static void nvmet_execute_identify_ctrl(struct nvmet_req *req)
+{
+ struct nvmet_ctrl *ctrl = req->sq->ctrl;
+ struct nvme_id_ctrl *id;
+ u16 status = 0;
+ const char model[] = "Linux";
+
+ id = kzalloc(sizeof(*id), GFP_KERNEL);
+ if (!id) {
+ status = NVME_SC_INTERNAL;
+ goto out;
+ }
+
+ /* XXX: figure out how to assign real vendors IDs. */
+ id->vid = 0;
+ id->ssvid = 0;
+
+ bin2hex(id->sn, &ctrl->subsys->serial,
+ min(sizeof(ctrl->subsys->serial), sizeof(id->sn) / 2));
+ memcpy_and_pad(id->mn, sizeof(id->mn), model, sizeof(model) - 1, ' ');
+ memcpy_and_pad(id->fr, sizeof(id->fr),
+ UTS_RELEASE, strlen(UTS_RELEASE), ' ');
+
+ id->rab = 6;
+
+ /*
+ * XXX: figure out how we can assign a IEEE OUI, but until then
+ * the safest is to leave it as zeroes.
+ */
+
+ /* we support multiple ports and multiples hosts: */
+ id->cmic = (1 << 0) | (1 << 1);
+
+ /* no limit on data transfer sizes for now */
+ id->mdts = 0;
+ id->cntlid = cpu_to_le16(ctrl->cntlid);
+ id->ver = cpu_to_le32(ctrl->subsys->ver);
+
+ /* XXX: figure out what to do about RTD3R/RTD3 */
+ id->oaes = cpu_to_le32(1 << 8);
+ id->ctratt = cpu_to_le32(1 << 0);
+
+ id->oacs = 0;
+
+ /*
+ * We don't really have a practical limit on the number of abort
+ * comands. But we don't do anything useful for abort either, so
+ * no point in allowing more abort commands than the spec requires.
+ */
+ id->acl = 3;
+
+ id->aerl = NVMET_ASYNC_EVENTS - 1;
+
+ /* first slot is read-only, only one slot supported */
+ id->frmw = (1 << 0) | (1 << 1);
+ id->lpa = (1 << 0) | (1 << 2);
+ id->elpe = NVMET_ERROR_LOG_SLOTS - 1;
+ id->npss = 0;
+
+ /* We support keep-alive timeout in granularity of seconds */
+ id->kas = cpu_to_le16(NVMET_KAS);
+
+ id->sqes = (0x6 << 4) | 0x6;
+ id->cqes = (0x4 << 4) | 0x4;
+
+ /* no enforcement soft-limit for maxcmd - pick arbitrary high value */
+ id->maxcmd = cpu_to_le16(NVMET_MAX_CMD);
+
+ id->nn = cpu_to_le32(ctrl->subsys->max_nsid);
+ id->oncs = cpu_to_le16(NVME_CTRL_ONCS_DSM |
+ NVME_CTRL_ONCS_WRITE_ZEROES);
+
+ /* XXX: don't report vwc if the underlying device is write through */
+ id->vwc = NVME_CTRL_VWC_PRESENT;
+
+ /*
+ * We can't support atomic writes bigger than a LBA without support
+ * from the backend device.
+ */
+ id->awun = 0;
+ id->awupf = 0;
+
+ id->sgls = cpu_to_le32(1 << 0); /* we always support SGLs */
+ if (ctrl->ops->has_keyed_sgls)
+ id->sgls |= cpu_to_le32(1 << 2);
+ if (ctrl->ops->sqe_inline_size)
+ id->sgls |= cpu_to_le32(1 << 20);
+
+ strcpy(id->subnqn, ctrl->subsys->subsysnqn);
+
+ /* Max command capsule size is sqe + single page of in-capsule data */
+ id->ioccsz = cpu_to_le32((sizeof(struct nvme_command) +
+ ctrl->ops->sqe_inline_size) / 16);
+ /* Max response capsule size is cqe */
+ id->iorcsz = cpu_to_le32(sizeof(struct nvme_completion) / 16);
+
+ id->msdbd = ctrl->ops->msdbd;
+
+ /*
+ * Meh, we don't really support any power state. Fake up the same
+ * values that qemu does.
+ */
+ id->psd[0].max_power = cpu_to_le16(0x9c4);
+ id->psd[0].entry_lat = cpu_to_le32(0x10);
+ id->psd[0].exit_lat = cpu_to_le32(0x4);
+
+ status = nvmet_copy_to_sgl(req, 0, id, sizeof(*id));
+
+ kfree(id);
+out:
+ nvmet_req_complete(req, status);
+}
+
+static void nvmet_execute_identify_ns(struct nvmet_req *req)
+{
+ struct nvmet_ns *ns;
+ struct nvme_id_ns *id;
+ u16 status = 0;
+
+ ns = nvmet_find_namespace(req->sq->ctrl, req->cmd->identify.nsid);
+ if (!ns) {
+ status = NVME_SC_INVALID_NS | NVME_SC_DNR;
+ goto out;
+ }
+
+ id = kzalloc(sizeof(*id), GFP_KERNEL);
+ if (!id) {
+ status = NVME_SC_INTERNAL;
+ goto out_put_ns;
+ }
+
+ /*
+ * nuse = ncap = nsze isn't aways true, but we have no way to find
+ * that out from the underlying device.
+ */
+ id->ncap = id->nuse = id->nsze =
+ cpu_to_le64(ns->size >> ns->blksize_shift);
+
+ /*
+ * We just provide a single LBA format that matches what the
+ * underlying device reports.
+ */
+ id->nlbaf = 0;
+ id->flbas = 0;
+
+ /*
+ * Our namespace might always be shared. Not just with other
+ * controllers, but also with any other user of the block device.
+ */
+ id->nmic = (1 << 0);
+
+ memcpy(&id->nguid, &ns->nguid, sizeof(uuid_le));
+
+ id->lbaf[0].ds = ns->blksize_shift;
+
+ status = nvmet_copy_to_sgl(req, 0, id, sizeof(*id));
+
+ kfree(id);
+out_put_ns:
+ nvmet_put_namespace(ns);
+out:
+ nvmet_req_complete(req, status);
+}
+
+static void nvmet_execute_identify_nslist(struct nvmet_req *req)
+{
+ static const int buf_size = NVME_IDENTIFY_DATA_SIZE;
+ struct nvmet_ctrl *ctrl = req->sq->ctrl;
+ struct nvmet_ns *ns;
+ u32 min_nsid = le32_to_cpu(req->cmd->identify.nsid);
+ __le32 *list;
+ u16 status = 0;
+ int i = 0;
+
+ list = kzalloc(buf_size, GFP_KERNEL);
+ if (!list) {
+ status = NVME_SC_INTERNAL;
+ goto out;
+ }
+
+ rcu_read_lock();
+ list_for_each_entry_rcu(ns, &ctrl->subsys->namespaces, dev_link) {
+ if (ns->nsid <= min_nsid)
+ continue;
+ list[i++] = cpu_to_le32(ns->nsid);
+ if (i == buf_size / sizeof(__le32))
+ break;
+ }
+ rcu_read_unlock();
+
+ status = nvmet_copy_to_sgl(req, 0, list, buf_size);
+
+ kfree(list);
+out:
+ nvmet_req_complete(req, status);
+}
+
+static u16 nvmet_copy_ns_identifier(struct nvmet_req *req, u8 type, u8 len,
+ void *id, off_t *off)
+{
+ struct nvme_ns_id_desc desc = {
+ .nidt = type,
+ .nidl = len,
+ };
+ u16 status;
+
+ status = nvmet_copy_to_sgl(req, *off, &desc, sizeof(desc));
+ if (status)
+ return status;
+ *off += sizeof(desc);
+
+ status = nvmet_copy_to_sgl(req, *off, id, len);
+ if (status)
+ return status;
+ *off += len;
+
+ return 0;
+}
+
+static void nvmet_execute_identify_desclist(struct nvmet_req *req)
+{
+ struct nvmet_ns *ns;
+ u16 status = 0;
+ off_t off = 0;
+
+ ns = nvmet_find_namespace(req->sq->ctrl, req->cmd->identify.nsid);
+ if (!ns) {
+ status = NVME_SC_INVALID_NS | NVME_SC_DNR;
+ goto out;
+ }
+
+ if (memchr_inv(&ns->uuid, 0, sizeof(ns->uuid))) {
+ status = nvmet_copy_ns_identifier(req, NVME_NIDT_UUID,
+ NVME_NIDT_UUID_LEN,
+ &ns->uuid, &off);
+ if (status)
+ goto out_put_ns;
+ }
+ if (memchr_inv(ns->nguid, 0, sizeof(ns->nguid))) {
+ status = nvmet_copy_ns_identifier(req, NVME_NIDT_NGUID,
+ NVME_NIDT_NGUID_LEN,
+ &ns->nguid, &off);
+ if (status)
+ goto out_put_ns;
+ }
+
+ if (sg_zero_buffer(req->sg, req->sg_cnt, NVME_IDENTIFY_DATA_SIZE - off,
+ off) != NVME_IDENTIFY_DATA_SIZE - off)
+ status = NVME_SC_INTERNAL | NVME_SC_DNR;
+out_put_ns:
+ nvmet_put_namespace(ns);
+out:
+ nvmet_req_complete(req, status);
+}
+
+/*
+ * A "mimimum viable" abort implementation: the command is mandatory in the
+ * spec, but we are not required to do any useful work. We couldn't really
+ * do a useful abort, so don't bother even with waiting for the command
+ * to be exectuted and return immediately telling the command to abort
+ * wasn't found.
+ */
+static void nvmet_execute_abort(struct nvmet_req *req)
+{
+ nvmet_set_result(req, 1);
+ nvmet_req_complete(req, 0);
+}
+
+static void nvmet_execute_set_features(struct nvmet_req *req)
+{
+ struct nvmet_subsys *subsys = req->sq->ctrl->subsys;
+ u32 cdw10 = le32_to_cpu(req->cmd->common.cdw10[0]);
+ u32 val32;
+ u16 status = 0;
+
+ switch (cdw10 & 0xff) {
+ case NVME_FEAT_NUM_QUEUES:
+ nvmet_set_result(req,
+ (subsys->max_qid - 1) | ((subsys->max_qid - 1) << 16));
+ break;
+ case NVME_FEAT_KATO:
+ val32 = le32_to_cpu(req->cmd->common.cdw10[1]);
+ req->sq->ctrl->kato = DIV_ROUND_UP(val32, 1000);
+ nvmet_set_result(req, req->sq->ctrl->kato);
+ break;
+ case NVME_FEAT_HOST_ID:
+ status = NVME_SC_CMD_SEQ_ERROR | NVME_SC_DNR;
+ break;
+ default:
+ status = NVME_SC_INVALID_FIELD | NVME_SC_DNR;
+ break;
+ }
+
+ nvmet_req_complete(req, status);
+}
+
+static void nvmet_execute_get_features(struct nvmet_req *req)
+{
+ struct nvmet_subsys *subsys = req->sq->ctrl->subsys;
+ u32 cdw10 = le32_to_cpu(req->cmd->common.cdw10[0]);
+ u16 status = 0;
+
+ switch (cdw10 & 0xff) {
+ /*
+ * These features are mandatory in the spec, but we don't
+ * have a useful way to implement them. We'll eventually
+ * need to come up with some fake values for these.
+ */
+#if 0
+ case NVME_FEAT_ARBITRATION:
+ break;
+ case NVME_FEAT_POWER_MGMT:
+ break;
+ case NVME_FEAT_TEMP_THRESH:
+ break;
+ case NVME_FEAT_ERR_RECOVERY:
+ break;
+ case NVME_FEAT_IRQ_COALESCE:
+ break;
+ case NVME_FEAT_IRQ_CONFIG:
+ break;
+ case NVME_FEAT_WRITE_ATOMIC:
+ break;
+ case NVME_FEAT_ASYNC_EVENT:
+ break;
+#endif
+ case NVME_FEAT_VOLATILE_WC:
+ nvmet_set_result(req, 1);
+ break;
+ case NVME_FEAT_NUM_QUEUES:
+ nvmet_set_result(req,
+ (subsys->max_qid-1) | ((subsys->max_qid-1) << 16));
+ break;
+ case NVME_FEAT_KATO:
+ nvmet_set_result(req, req->sq->ctrl->kato * 1000);
+ break;
+ case NVME_FEAT_HOST_ID:
+ /* need 128-bit host identifier flag */
+ if (!(req->cmd->common.cdw10[1] & cpu_to_le32(1 << 0))) {
+ status = NVME_SC_INVALID_FIELD | NVME_SC_DNR;
+ break;
+ }
+
+ status = nvmet_copy_to_sgl(req, 0, &req->sq->ctrl->hostid,
+ sizeof(req->sq->ctrl->hostid));
+ break;
+ default:
+ status = NVME_SC_INVALID_FIELD | NVME_SC_DNR;
+ break;
+ }
+
+ nvmet_req_complete(req, status);
+}
+
+static void nvmet_execute_async_event(struct nvmet_req *req)
+{
+ struct nvmet_ctrl *ctrl = req->sq->ctrl;
+
+ mutex_lock(&ctrl->lock);
+ if (ctrl->nr_async_event_cmds >= NVMET_ASYNC_EVENTS) {
+ mutex_unlock(&ctrl->lock);
+ nvmet_req_complete(req, NVME_SC_ASYNC_LIMIT | NVME_SC_DNR);
+ return;
+ }
+ ctrl->async_event_cmds[ctrl->nr_async_event_cmds++] = req;
+ mutex_unlock(&ctrl->lock);
+
+ schedule_work(&ctrl->async_event_work);
+}
+
+static void nvmet_execute_keep_alive(struct nvmet_req *req)
+{
+ struct nvmet_ctrl *ctrl = req->sq->ctrl;
+
+ pr_debug("ctrl %d update keep-alive timer for %d secs\n",
+ ctrl->cntlid, ctrl->kato);
+
+ mod_delayed_work(system_wq, &ctrl->ka_work, ctrl->kato * HZ);
+ nvmet_req_complete(req, 0);
+}
+
+u16 nvmet_parse_admin_cmd(struct nvmet_req *req)
+{
+ struct nvme_command *cmd = req->cmd;
+ u16 ret;
+
+ req->ns = NULL;
+
+ ret = nvmet_check_ctrl_status(req, cmd);
+ if (unlikely(ret))
+ return ret;
+
+ switch (cmd->common.opcode) {
+ case nvme_admin_get_log_page:
+ req->data_len = nvmet_get_log_page_len(cmd);
+
+ switch (cmd->get_log_page.lid) {
+ case NVME_LOG_ERROR:
+ case NVME_LOG_SMART:
+ case NVME_LOG_FW_SLOT:
+ req->execute = nvmet_execute_get_log_page;
+ return 0;
+ }
+ break;
+ case nvme_admin_identify:
+ req->data_len = NVME_IDENTIFY_DATA_SIZE;
+ switch (cmd->identify.cns) {
+ case NVME_ID_CNS_NS:
+ req->execute = nvmet_execute_identify_ns;
+ return 0;
+ case NVME_ID_CNS_CTRL:
+ req->execute = nvmet_execute_identify_ctrl;
+ return 0;
+ case NVME_ID_CNS_NS_ACTIVE_LIST:
+ req->execute = nvmet_execute_identify_nslist;
+ return 0;
+ case NVME_ID_CNS_NS_DESC_LIST:
+ req->execute = nvmet_execute_identify_desclist;
+ return 0;
+ }
+ break;
+ case nvme_admin_abort_cmd:
+ req->execute = nvmet_execute_abort;
+ req->data_len = 0;
+ return 0;
+ case nvme_admin_set_features:
+ req->execute = nvmet_execute_set_features;
+ req->data_len = 0;
+ return 0;
+ case nvme_admin_get_features:
+ req->execute = nvmet_execute_get_features;
+ req->data_len = 0;
+ return 0;
+ case nvme_admin_async_event:
+ req->execute = nvmet_execute_async_event;
+ req->data_len = 0;
+ return 0;
+ case nvme_admin_keep_alive:
+ req->execute = nvmet_execute_keep_alive;
+ req->data_len = 0;
+ return 0;
+ }
+
+ pr_err("unhandled cmd %d on qid %d\n", cmd->common.opcode,
+ req->sq->qid);
+ return NVME_SC_INVALID_OPCODE | NVME_SC_DNR;
+}
diff --git a/src/kernel/linux/v4.14/drivers/nvme/target/configfs.c b/src/kernel/linux/v4.14/drivers/nvme/target/configfs.c
new file mode 100644
index 0000000..b6aeb1d
--- /dev/null
+++ b/src/kernel/linux/v4.14/drivers/nvme/target/configfs.c
@@ -0,0 +1,1020 @@
+/*
+ * Configfs interface for the NVMe target.
+ * Copyright (c) 2015-2016 HGST, a Western Digital Company.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ */
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/stat.h>
+#include <linux/ctype.h>
+
+#include "nvmet.h"
+
+static struct config_item_type nvmet_host_type;
+static struct config_item_type nvmet_subsys_type;
+
+/*
+ * nvmet_port Generic ConfigFS definitions.
+ * Used in any place in the ConfigFS tree that refers to an address.
+ */
+static ssize_t nvmet_addr_adrfam_show(struct config_item *item,
+ char *page)
+{
+ switch (to_nvmet_port(item)->disc_addr.adrfam) {
+ case NVMF_ADDR_FAMILY_IP4:
+ return sprintf(page, "ipv4\n");
+ case NVMF_ADDR_FAMILY_IP6:
+ return sprintf(page, "ipv6\n");
+ case NVMF_ADDR_FAMILY_IB:
+ return sprintf(page, "ib\n");
+ case NVMF_ADDR_FAMILY_FC:
+ return sprintf(page, "fc\n");
+ default:
+ return sprintf(page, "\n");
+ }
+}
+
+static ssize_t nvmet_addr_adrfam_store(struct config_item *item,
+ const char *page, size_t count)
+{
+ struct nvmet_port *port = to_nvmet_port(item);
+
+ if (port->enabled) {
+ pr_err("Cannot modify address while enabled\n");
+ pr_err("Disable the address before modifying\n");
+ return -EACCES;
+ }
+
+ if (sysfs_streq(page, "ipv4")) {
+ port->disc_addr.adrfam = NVMF_ADDR_FAMILY_IP4;
+ } else if (sysfs_streq(page, "ipv6")) {
+ port->disc_addr.adrfam = NVMF_ADDR_FAMILY_IP6;
+ } else if (sysfs_streq(page, "ib")) {
+ port->disc_addr.adrfam = NVMF_ADDR_FAMILY_IB;
+ } else if (sysfs_streq(page, "fc")) {
+ port->disc_addr.adrfam = NVMF_ADDR_FAMILY_FC;
+ } else {
+ pr_err("Invalid value '%s' for adrfam\n", page);
+ return -EINVAL;
+ }
+
+ return count;
+}
+
+CONFIGFS_ATTR(nvmet_, addr_adrfam);
+
+static ssize_t nvmet_addr_portid_show(struct config_item *item,
+ char *page)
+{
+ struct nvmet_port *port = to_nvmet_port(item);
+
+ return snprintf(page, PAGE_SIZE, "%d\n",
+ le16_to_cpu(port->disc_addr.portid));
+}
+
+static ssize_t nvmet_addr_portid_store(struct config_item *item,
+ const char *page, size_t count)
+{
+ struct nvmet_port *port = to_nvmet_port(item);
+ u16 portid = 0;
+
+ if (kstrtou16(page, 0, &portid)) {
+ pr_err("Invalid value '%s' for portid\n", page);
+ return -EINVAL;
+ }
+
+ if (port->enabled) {
+ pr_err("Cannot modify address while enabled\n");
+ pr_err("Disable the address before modifying\n");
+ return -EACCES;
+ }
+ port->disc_addr.portid = cpu_to_le16(portid);
+ return count;
+}
+
+CONFIGFS_ATTR(nvmet_, addr_portid);
+
+static ssize_t nvmet_addr_traddr_show(struct config_item *item,
+ char *page)
+{
+ struct nvmet_port *port = to_nvmet_port(item);
+
+ return snprintf(page, PAGE_SIZE, "%s\n",
+ port->disc_addr.traddr);
+}
+
+static ssize_t nvmet_addr_traddr_store(struct config_item *item,
+ const char *page, size_t count)
+{
+ struct nvmet_port *port = to_nvmet_port(item);
+
+ if (count > NVMF_TRADDR_SIZE) {
+ pr_err("Invalid value '%s' for traddr\n", page);
+ return -EINVAL;
+ }
+
+ if (port->enabled) {
+ pr_err("Cannot modify address while enabled\n");
+ pr_err("Disable the address before modifying\n");
+ return -EACCES;
+ }
+ return snprintf(port->disc_addr.traddr,
+ sizeof(port->disc_addr.traddr), "%s", page);
+}
+
+CONFIGFS_ATTR(nvmet_, addr_traddr);
+
+static ssize_t nvmet_addr_treq_show(struct config_item *item,
+ char *page)
+{
+ switch (to_nvmet_port(item)->disc_addr.treq) {
+ case NVMF_TREQ_NOT_SPECIFIED:
+ return sprintf(page, "not specified\n");
+ case NVMF_TREQ_REQUIRED:
+ return sprintf(page, "required\n");
+ case NVMF_TREQ_NOT_REQUIRED:
+ return sprintf(page, "not required\n");
+ default:
+ return sprintf(page, "\n");
+ }
+}
+
+static ssize_t nvmet_addr_treq_store(struct config_item *item,
+ const char *page, size_t count)
+{
+ struct nvmet_port *port = to_nvmet_port(item);
+
+ if (port->enabled) {
+ pr_err("Cannot modify address while enabled\n");
+ pr_err("Disable the address before modifying\n");
+ return -EACCES;
+ }
+
+ if (sysfs_streq(page, "not specified")) {
+ port->disc_addr.treq = NVMF_TREQ_NOT_SPECIFIED;
+ } else if (sysfs_streq(page, "required")) {
+ port->disc_addr.treq = NVMF_TREQ_REQUIRED;
+ } else if (sysfs_streq(page, "not required")) {
+ port->disc_addr.treq = NVMF_TREQ_NOT_REQUIRED;
+ } else {
+ pr_err("Invalid value '%s' for treq\n", page);
+ return -EINVAL;
+ }
+
+ return count;
+}
+
+CONFIGFS_ATTR(nvmet_, addr_treq);
+
+static ssize_t nvmet_addr_trsvcid_show(struct config_item *item,
+ char *page)
+{
+ struct nvmet_port *port = to_nvmet_port(item);
+
+ return snprintf(page, PAGE_SIZE, "%s\n",
+ port->disc_addr.trsvcid);
+}
+
+static ssize_t nvmet_addr_trsvcid_store(struct config_item *item,
+ const char *page, size_t count)
+{
+ struct nvmet_port *port = to_nvmet_port(item);
+
+ if (count > NVMF_TRSVCID_SIZE) {
+ pr_err("Invalid value '%s' for trsvcid\n", page);
+ return -EINVAL;
+ }
+ if (port->enabled) {
+ pr_err("Cannot modify address while enabled\n");
+ pr_err("Disable the address before modifying\n");
+ return -EACCES;
+ }
+ return snprintf(port->disc_addr.trsvcid,
+ sizeof(port->disc_addr.trsvcid), "%s", page);
+}
+
+CONFIGFS_ATTR(nvmet_, addr_trsvcid);
+
+static ssize_t nvmet_addr_trtype_show(struct config_item *item,
+ char *page)
+{
+ switch (to_nvmet_port(item)->disc_addr.trtype) {
+ case NVMF_TRTYPE_RDMA:
+ return sprintf(page, "rdma\n");
+ case NVMF_TRTYPE_LOOP:
+ return sprintf(page, "loop\n");
+ case NVMF_TRTYPE_FC:
+ return sprintf(page, "fc\n");
+ default:
+ return sprintf(page, "\n");
+ }
+}
+
+static void nvmet_port_init_tsas_rdma(struct nvmet_port *port)
+{
+ port->disc_addr.trtype = NVMF_TRTYPE_RDMA;
+ memset(&port->disc_addr.tsas.rdma, 0, NVMF_TSAS_SIZE);
+ port->disc_addr.tsas.rdma.qptype = NVMF_RDMA_QPTYPE_CONNECTED;
+ port->disc_addr.tsas.rdma.prtype = NVMF_RDMA_PRTYPE_NOT_SPECIFIED;
+ port->disc_addr.tsas.rdma.cms = NVMF_RDMA_CMS_RDMA_CM;
+}
+
+static void nvmet_port_init_tsas_loop(struct nvmet_port *port)
+{
+ port->disc_addr.trtype = NVMF_TRTYPE_LOOP;
+ memset(&port->disc_addr.tsas, 0, NVMF_TSAS_SIZE);
+}
+
+static void nvmet_port_init_tsas_fc(struct nvmet_port *port)
+{
+ port->disc_addr.trtype = NVMF_TRTYPE_FC;
+ memset(&port->disc_addr.tsas, 0, NVMF_TSAS_SIZE);
+}
+
+static ssize_t nvmet_addr_trtype_store(struct config_item *item,
+ const char *page, size_t count)
+{
+ struct nvmet_port *port = to_nvmet_port(item);
+
+ if (port->enabled) {
+ pr_err("Cannot modify address while enabled\n");
+ pr_err("Disable the address before modifying\n");
+ return -EACCES;
+ }
+
+ if (sysfs_streq(page, "rdma")) {
+ nvmet_port_init_tsas_rdma(port);
+ } else if (sysfs_streq(page, "loop")) {
+ nvmet_port_init_tsas_loop(port);
+ } else if (sysfs_streq(page, "fc")) {
+ nvmet_port_init_tsas_fc(port);
+ } else {
+ pr_err("Invalid value '%s' for trtype\n", page);
+ return -EINVAL;
+ }
+
+ return count;
+}
+
+CONFIGFS_ATTR(nvmet_, addr_trtype);
+
+/*
+ * Namespace structures & file operation functions below
+ */
+static ssize_t nvmet_ns_device_path_show(struct config_item *item, char *page)
+{
+ return sprintf(page, "%s\n", to_nvmet_ns(item)->device_path);
+}
+
+static ssize_t nvmet_ns_device_path_store(struct config_item *item,
+ const char *page, size_t count)
+{
+ struct nvmet_ns *ns = to_nvmet_ns(item);
+ struct nvmet_subsys *subsys = ns->subsys;
+ int ret;
+
+ mutex_lock(&subsys->lock);
+ ret = -EBUSY;
+ if (ns->enabled)
+ goto out_unlock;
+
+ kfree(ns->device_path);
+
+ ret = -ENOMEM;
+ ns->device_path = kstrdup(page, GFP_KERNEL);
+ if (!ns->device_path)
+ goto out_unlock;
+
+ mutex_unlock(&subsys->lock);
+ return count;
+
+out_unlock:
+ mutex_unlock(&subsys->lock);
+ return ret;
+}
+
+CONFIGFS_ATTR(nvmet_ns_, device_path);
+
+static ssize_t nvmet_ns_device_uuid_show(struct config_item *item, char *page)
+{
+ return sprintf(page, "%pUb\n", &to_nvmet_ns(item)->uuid);
+}
+
+static ssize_t nvmet_ns_device_uuid_store(struct config_item *item,
+ const char *page, size_t count)
+{
+ struct nvmet_ns *ns = to_nvmet_ns(item);
+ struct nvmet_subsys *subsys = ns->subsys;
+ int ret = 0;
+
+
+ mutex_lock(&subsys->lock);
+ if (ns->enabled) {
+ ret = -EBUSY;
+ goto out_unlock;
+ }
+
+
+ if (uuid_parse(page, &ns->uuid))
+ ret = -EINVAL;
+
+out_unlock:
+ mutex_unlock(&subsys->lock);
+ return ret ? ret : count;
+}
+
+static ssize_t nvmet_ns_device_nguid_show(struct config_item *item, char *page)
+{
+ return sprintf(page, "%pUb\n", &to_nvmet_ns(item)->nguid);
+}
+
+CONFIGFS_ATTR(nvmet_ns_, device_uuid);
+
+static ssize_t nvmet_ns_device_nguid_store(struct config_item *item,
+ const char *page, size_t count)
+{
+ struct nvmet_ns *ns = to_nvmet_ns(item);
+ struct nvmet_subsys *subsys = ns->subsys;
+ u8 nguid[16];
+ const char *p = page;
+ int i;
+ int ret = 0;
+
+ mutex_lock(&subsys->lock);
+ if (ns->enabled) {
+ ret = -EBUSY;
+ goto out_unlock;
+ }
+
+ for (i = 0; i < 16; i++) {
+ if (p + 2 > page + count) {
+ ret = -EINVAL;
+ goto out_unlock;
+ }
+ if (!isxdigit(p[0]) || !isxdigit(p[1])) {
+ ret = -EINVAL;
+ goto out_unlock;
+ }
+
+ nguid[i] = (hex_to_bin(p[0]) << 4) | hex_to_bin(p[1]);
+ p += 2;
+
+ if (*p == '-' || *p == ':')
+ p++;
+ }
+
+ memcpy(&ns->nguid, nguid, sizeof(nguid));
+out_unlock:
+ mutex_unlock(&subsys->lock);
+ return ret ? ret : count;
+}
+
+CONFIGFS_ATTR(nvmet_ns_, device_nguid);
+
+static ssize_t nvmet_ns_enable_show(struct config_item *item, char *page)
+{
+ return sprintf(page, "%d\n", to_nvmet_ns(item)->enabled);
+}
+
+static ssize_t nvmet_ns_enable_store(struct config_item *item,
+ const char *page, size_t count)
+{
+ struct nvmet_ns *ns = to_nvmet_ns(item);
+ bool enable;
+ int ret = 0;
+
+ if (strtobool(page, &enable))
+ return -EINVAL;
+
+ if (enable)
+ ret = nvmet_ns_enable(ns);
+ else
+ nvmet_ns_disable(ns);
+
+ return ret ? ret : count;
+}
+
+CONFIGFS_ATTR(nvmet_ns_, enable);
+
+static struct configfs_attribute *nvmet_ns_attrs[] = {
+ &nvmet_ns_attr_device_path,
+ &nvmet_ns_attr_device_nguid,
+ &nvmet_ns_attr_device_uuid,
+ &nvmet_ns_attr_enable,
+ NULL,
+};
+
+static void nvmet_ns_release(struct config_item *item)
+{
+ struct nvmet_ns *ns = to_nvmet_ns(item);
+
+ nvmet_ns_free(ns);
+}
+
+static struct configfs_item_operations nvmet_ns_item_ops = {
+ .release = nvmet_ns_release,
+};
+
+static struct config_item_type nvmet_ns_type = {
+ .ct_item_ops = &nvmet_ns_item_ops,
+ .ct_attrs = nvmet_ns_attrs,
+ .ct_owner = THIS_MODULE,
+};
+
+static struct config_group *nvmet_ns_make(struct config_group *group,
+ const char *name)
+{
+ struct nvmet_subsys *subsys = namespaces_to_subsys(&group->cg_item);
+ struct nvmet_ns *ns;
+ int ret;
+ u32 nsid;
+
+ ret = kstrtou32(name, 0, &nsid);
+ if (ret)
+ goto out;
+
+ ret = -EINVAL;
+ if (nsid == 0 || nsid == NVME_NSID_ALL)
+ goto out;
+
+ ret = -ENOMEM;
+ ns = nvmet_ns_alloc(subsys, nsid);
+ if (!ns)
+ goto out;
+ config_group_init_type_name(&ns->group, name, &nvmet_ns_type);
+
+ pr_info("adding nsid %d to subsystem %s\n", nsid, subsys->subsysnqn);
+
+ return &ns->group;
+out:
+ return ERR_PTR(ret);
+}
+
+static struct configfs_group_operations nvmet_namespaces_group_ops = {
+ .make_group = nvmet_ns_make,
+};
+
+static struct config_item_type nvmet_namespaces_type = {
+ .ct_group_ops = &nvmet_namespaces_group_ops,
+ .ct_owner = THIS_MODULE,
+};
+
+static int nvmet_port_subsys_allow_link(struct config_item *parent,
+ struct config_item *target)
+{
+ struct nvmet_port *port = to_nvmet_port(parent->ci_parent);
+ struct nvmet_subsys *subsys;
+ struct nvmet_subsys_link *link, *p;
+ int ret;
+
+ if (target->ci_type != &nvmet_subsys_type) {
+ pr_err("can only link subsystems into the subsystems dir.!\n");
+ return -EINVAL;
+ }
+ subsys = to_subsys(target);
+ link = kmalloc(sizeof(*link), GFP_KERNEL);
+ if (!link)
+ return -ENOMEM;
+ link->subsys = subsys;
+
+ down_write(&nvmet_config_sem);
+ ret = -EEXIST;
+ list_for_each_entry(p, &port->subsystems, entry) {
+ if (p->subsys == subsys)
+ goto out_free_link;
+ }
+
+ if (list_empty(&port->subsystems)) {
+ ret = nvmet_enable_port(port);
+ if (ret)
+ goto out_free_link;
+ }
+
+ list_add_tail(&link->entry, &port->subsystems);
+ nvmet_genctr++;
+ up_write(&nvmet_config_sem);
+ return 0;
+
+out_free_link:
+ up_write(&nvmet_config_sem);
+ kfree(link);
+ return ret;
+}
+
+static void nvmet_port_subsys_drop_link(struct config_item *parent,
+ struct config_item *target)
+{
+ struct nvmet_port *port = to_nvmet_port(parent->ci_parent);
+ struct nvmet_subsys *subsys = to_subsys(target);
+ struct nvmet_subsys_link *p;
+
+ down_write(&nvmet_config_sem);
+ list_for_each_entry(p, &port->subsystems, entry) {
+ if (p->subsys == subsys)
+ goto found;
+ }
+ up_write(&nvmet_config_sem);
+ return;
+
+found:
+ list_del(&p->entry);
+ nvmet_genctr++;
+ if (list_empty(&port->subsystems))
+ nvmet_disable_port(port);
+ up_write(&nvmet_config_sem);
+ kfree(p);
+}
+
+static struct configfs_item_operations nvmet_port_subsys_item_ops = {
+ .allow_link = nvmet_port_subsys_allow_link,
+ .drop_link = nvmet_port_subsys_drop_link,
+};
+
+static struct config_item_type nvmet_port_subsys_type = {
+ .ct_item_ops = &nvmet_port_subsys_item_ops,
+ .ct_owner = THIS_MODULE,
+};
+
+static int nvmet_allowed_hosts_allow_link(struct config_item *parent,
+ struct config_item *target)
+{
+ struct nvmet_subsys *subsys = to_subsys(parent->ci_parent);
+ struct nvmet_host *host;
+ struct nvmet_host_link *link, *p;
+ int ret;
+
+ if (target->ci_type != &nvmet_host_type) {
+ pr_err("can only link hosts into the allowed_hosts directory!\n");
+ return -EINVAL;
+ }
+
+ host = to_host(target);
+ link = kmalloc(sizeof(*link), GFP_KERNEL);
+ if (!link)
+ return -ENOMEM;
+ link->host = host;
+
+ down_write(&nvmet_config_sem);
+ ret = -EINVAL;
+ if (subsys->allow_any_host) {
+ pr_err("can't add hosts when allow_any_host is set!\n");
+ goto out_free_link;
+ }
+
+ ret = -EEXIST;
+ list_for_each_entry(p, &subsys->hosts, entry) {
+ if (!strcmp(nvmet_host_name(p->host), nvmet_host_name(host)))
+ goto out_free_link;
+ }
+ list_add_tail(&link->entry, &subsys->hosts);
+ nvmet_genctr++;
+ up_write(&nvmet_config_sem);
+ return 0;
+out_free_link:
+ up_write(&nvmet_config_sem);
+ kfree(link);
+ return ret;
+}
+
+static void nvmet_allowed_hosts_drop_link(struct config_item *parent,
+ struct config_item *target)
+{
+ struct nvmet_subsys *subsys = to_subsys(parent->ci_parent);
+ struct nvmet_host *host = to_host(target);
+ struct nvmet_host_link *p;
+
+ down_write(&nvmet_config_sem);
+ list_for_each_entry(p, &subsys->hosts, entry) {
+ if (!strcmp(nvmet_host_name(p->host), nvmet_host_name(host)))
+ goto found;
+ }
+ up_write(&nvmet_config_sem);
+ return;
+
+found:
+ list_del(&p->entry);
+ nvmet_genctr++;
+ up_write(&nvmet_config_sem);
+ kfree(p);
+}
+
+static struct configfs_item_operations nvmet_allowed_hosts_item_ops = {
+ .allow_link = nvmet_allowed_hosts_allow_link,
+ .drop_link = nvmet_allowed_hosts_drop_link,
+};
+
+static struct config_item_type nvmet_allowed_hosts_type = {
+ .ct_item_ops = &nvmet_allowed_hosts_item_ops,
+ .ct_owner = THIS_MODULE,
+};
+
+static ssize_t nvmet_subsys_attr_allow_any_host_show(struct config_item *item,
+ char *page)
+{
+ return snprintf(page, PAGE_SIZE, "%d\n",
+ to_subsys(item)->allow_any_host);
+}
+
+static ssize_t nvmet_subsys_attr_allow_any_host_store(struct config_item *item,
+ const char *page, size_t count)
+{
+ struct nvmet_subsys *subsys = to_subsys(item);
+ bool allow_any_host;
+ int ret = 0;
+
+ if (strtobool(page, &allow_any_host))
+ return -EINVAL;
+
+ down_write(&nvmet_config_sem);
+ if (allow_any_host && !list_empty(&subsys->hosts)) {
+ pr_err("Can't set allow_any_host when explicit hosts are set!\n");
+ ret = -EINVAL;
+ goto out_unlock;
+ }
+
+ subsys->allow_any_host = allow_any_host;
+out_unlock:
+ up_write(&nvmet_config_sem);
+ return ret ? ret : count;
+}
+
+CONFIGFS_ATTR(nvmet_subsys_, attr_allow_any_host);
+
+static ssize_t nvmet_subsys_attr_version_show(struct config_item *item,
+ char *page)
+{
+ struct nvmet_subsys *subsys = to_subsys(item);
+
+ if (NVME_TERTIARY(subsys->ver))
+ return snprintf(page, PAGE_SIZE, "%d.%d.%d\n",
+ (int)NVME_MAJOR(subsys->ver),
+ (int)NVME_MINOR(subsys->ver),
+ (int)NVME_TERTIARY(subsys->ver));
+ else
+ return snprintf(page, PAGE_SIZE, "%d.%d\n",
+ (int)NVME_MAJOR(subsys->ver),
+ (int)NVME_MINOR(subsys->ver));
+}
+
+static ssize_t nvmet_subsys_attr_version_store(struct config_item *item,
+ const char *page, size_t count)
+{
+ struct nvmet_subsys *subsys = to_subsys(item);
+ int major, minor, tertiary = 0;
+ int ret;
+
+
+ ret = sscanf(page, "%d.%d.%d\n", &major, &minor, &tertiary);
+ if (ret != 2 && ret != 3)
+ return -EINVAL;
+
+ down_write(&nvmet_config_sem);
+ subsys->ver = NVME_VS(major, minor, tertiary);
+ up_write(&nvmet_config_sem);
+
+ return count;
+}
+CONFIGFS_ATTR(nvmet_subsys_, attr_version);
+
+static ssize_t nvmet_subsys_attr_serial_show(struct config_item *item,
+ char *page)
+{
+ struct nvmet_subsys *subsys = to_subsys(item);
+
+ return snprintf(page, PAGE_SIZE, "%llx\n", subsys->serial);
+}
+
+static ssize_t nvmet_subsys_attr_serial_store(struct config_item *item,
+ const char *page, size_t count)
+{
+ struct nvmet_subsys *subsys = to_subsys(item);
+
+ down_write(&nvmet_config_sem);
+ sscanf(page, "%llx\n", &subsys->serial);
+ up_write(&nvmet_config_sem);
+
+ return count;
+}
+CONFIGFS_ATTR(nvmet_subsys_, attr_serial);
+
+static struct configfs_attribute *nvmet_subsys_attrs[] = {
+ &nvmet_subsys_attr_attr_allow_any_host,
+ &nvmet_subsys_attr_attr_version,
+ &nvmet_subsys_attr_attr_serial,
+ NULL,
+};
+
+/*
+ * Subsystem structures & folder operation functions below
+ */
+static void nvmet_subsys_release(struct config_item *item)
+{
+ struct nvmet_subsys *subsys = to_subsys(item);
+
+ nvmet_subsys_del_ctrls(subsys);
+ nvmet_subsys_put(subsys);
+}
+
+static struct configfs_item_operations nvmet_subsys_item_ops = {
+ .release = nvmet_subsys_release,
+};
+
+static struct config_item_type nvmet_subsys_type = {
+ .ct_item_ops = &nvmet_subsys_item_ops,
+ .ct_attrs = nvmet_subsys_attrs,
+ .ct_owner = THIS_MODULE,
+};
+
+static struct config_group *nvmet_subsys_make(struct config_group *group,
+ const char *name)
+{
+ struct nvmet_subsys *subsys;
+
+ if (sysfs_streq(name, NVME_DISC_SUBSYS_NAME)) {
+ pr_err("can't create discovery subsystem through configfs\n");
+ return ERR_PTR(-EINVAL);
+ }
+
+ subsys = nvmet_subsys_alloc(name, NVME_NQN_NVME);
+ if (!subsys)
+ return ERR_PTR(-ENOMEM);
+
+ config_group_init_type_name(&subsys->group, name, &nvmet_subsys_type);
+
+ config_group_init_type_name(&subsys->namespaces_group,
+ "namespaces", &nvmet_namespaces_type);
+ configfs_add_default_group(&subsys->namespaces_group, &subsys->group);
+
+ config_group_init_type_name(&subsys->allowed_hosts_group,
+ "allowed_hosts", &nvmet_allowed_hosts_type);
+ configfs_add_default_group(&subsys->allowed_hosts_group,
+ &subsys->group);
+
+ return &subsys->group;
+}
+
+static struct configfs_group_operations nvmet_subsystems_group_ops = {
+ .make_group = nvmet_subsys_make,
+};
+
+static struct config_item_type nvmet_subsystems_type = {
+ .ct_group_ops = &nvmet_subsystems_group_ops,
+ .ct_owner = THIS_MODULE,
+};
+
+static ssize_t nvmet_referral_enable_show(struct config_item *item,
+ char *page)
+{
+ return snprintf(page, PAGE_SIZE, "%d\n", to_nvmet_port(item)->enabled);
+}
+
+static ssize_t nvmet_referral_enable_store(struct config_item *item,
+ const char *page, size_t count)
+{
+ struct nvmet_port *parent = to_nvmet_port(item->ci_parent->ci_parent);
+ struct nvmet_port *port = to_nvmet_port(item);
+ bool enable;
+
+ if (strtobool(page, &enable))
+ goto inval;
+
+ if (enable)
+ nvmet_referral_enable(parent, port);
+ else
+ nvmet_referral_disable(port);
+
+ return count;
+inval:
+ pr_err("Invalid value '%s' for enable\n", page);
+ return -EINVAL;
+}
+
+CONFIGFS_ATTR(nvmet_referral_, enable);
+
+/*
+ * Discovery Service subsystem definitions
+ */
+static struct configfs_attribute *nvmet_referral_attrs[] = {
+ &nvmet_attr_addr_adrfam,
+ &nvmet_attr_addr_portid,
+ &nvmet_attr_addr_treq,
+ &nvmet_attr_addr_traddr,
+ &nvmet_attr_addr_trsvcid,
+ &nvmet_attr_addr_trtype,
+ &nvmet_referral_attr_enable,
+ NULL,
+};
+
+static void nvmet_referral_release(struct config_item *item)
+{
+ struct nvmet_port *port = to_nvmet_port(item);
+
+ nvmet_referral_disable(port);
+ kfree(port);
+}
+
+static struct configfs_item_operations nvmet_referral_item_ops = {
+ .release = nvmet_referral_release,
+};
+
+static struct config_item_type nvmet_referral_type = {
+ .ct_owner = THIS_MODULE,
+ .ct_attrs = nvmet_referral_attrs,
+ .ct_item_ops = &nvmet_referral_item_ops,
+};
+
+static struct config_group *nvmet_referral_make(
+ struct config_group *group, const char *name)
+{
+ struct nvmet_port *port;
+
+ port = kzalloc(sizeof(*port), GFP_KERNEL);
+ if (!port)
+ return ERR_PTR(-ENOMEM);
+
+ INIT_LIST_HEAD(&port->entry);
+ config_group_init_type_name(&port->group, name, &nvmet_referral_type);
+
+ return &port->group;
+}
+
+static struct configfs_group_operations nvmet_referral_group_ops = {
+ .make_group = nvmet_referral_make,
+};
+
+static struct config_item_type nvmet_referrals_type = {
+ .ct_owner = THIS_MODULE,
+ .ct_group_ops = &nvmet_referral_group_ops,
+};
+
+/*
+ * Ports definitions.
+ */
+static void nvmet_port_release(struct config_item *item)
+{
+ struct nvmet_port *port = to_nvmet_port(item);
+
+ kfree(port);
+}
+
+static struct configfs_attribute *nvmet_port_attrs[] = {
+ &nvmet_attr_addr_adrfam,
+ &nvmet_attr_addr_treq,
+ &nvmet_attr_addr_traddr,
+ &nvmet_attr_addr_trsvcid,
+ &nvmet_attr_addr_trtype,
+ NULL,
+};
+
+static struct configfs_item_operations nvmet_port_item_ops = {
+ .release = nvmet_port_release,
+};
+
+static struct config_item_type nvmet_port_type = {
+ .ct_attrs = nvmet_port_attrs,
+ .ct_item_ops = &nvmet_port_item_ops,
+ .ct_owner = THIS_MODULE,
+};
+
+static struct config_group *nvmet_ports_make(struct config_group *group,
+ const char *name)
+{
+ struct nvmet_port *port;
+ u16 portid;
+
+ if (kstrtou16(name, 0, &portid))
+ return ERR_PTR(-EINVAL);
+
+ port = kzalloc(sizeof(*port), GFP_KERNEL);
+ if (!port)
+ return ERR_PTR(-ENOMEM);
+
+ INIT_LIST_HEAD(&port->entry);
+ INIT_LIST_HEAD(&port->subsystems);
+ INIT_LIST_HEAD(&port->referrals);
+
+ port->disc_addr.portid = cpu_to_le16(portid);
+ config_group_init_type_name(&port->group, name, &nvmet_port_type);
+
+ config_group_init_type_name(&port->subsys_group,
+ "subsystems", &nvmet_port_subsys_type);
+ configfs_add_default_group(&port->subsys_group, &port->group);
+
+ config_group_init_type_name(&port->referrals_group,
+ "referrals", &nvmet_referrals_type);
+ configfs_add_default_group(&port->referrals_group, &port->group);
+
+ return &port->group;
+}
+
+static struct configfs_group_operations nvmet_ports_group_ops = {
+ .make_group = nvmet_ports_make,
+};
+
+static struct config_item_type nvmet_ports_type = {
+ .ct_group_ops = &nvmet_ports_group_ops,
+ .ct_owner = THIS_MODULE,
+};
+
+static struct config_group nvmet_subsystems_group;
+static struct config_group nvmet_ports_group;
+
+static void nvmet_host_release(struct config_item *item)
+{
+ struct nvmet_host *host = to_host(item);
+
+ kfree(host);
+}
+
+static struct configfs_item_operations nvmet_host_item_ops = {
+ .release = nvmet_host_release,
+};
+
+static struct config_item_type nvmet_host_type = {
+ .ct_item_ops = &nvmet_host_item_ops,
+ .ct_owner = THIS_MODULE,
+};
+
+static struct config_group *nvmet_hosts_make_group(struct config_group *group,
+ const char *name)
+{
+ struct nvmet_host *host;
+
+ host = kzalloc(sizeof(*host), GFP_KERNEL);
+ if (!host)
+ return ERR_PTR(-ENOMEM);
+
+ config_group_init_type_name(&host->group, name, &nvmet_host_type);
+
+ return &host->group;
+}
+
+static struct configfs_group_operations nvmet_hosts_group_ops = {
+ .make_group = nvmet_hosts_make_group,
+};
+
+static struct config_item_type nvmet_hosts_type = {
+ .ct_group_ops = &nvmet_hosts_group_ops,
+ .ct_owner = THIS_MODULE,
+};
+
+static struct config_group nvmet_hosts_group;
+
+static struct config_item_type nvmet_root_type = {
+ .ct_owner = THIS_MODULE,
+};
+
+static struct configfs_subsystem nvmet_configfs_subsystem = {
+ .su_group = {
+ .cg_item = {
+ .ci_namebuf = "nvmet",
+ .ci_type = &nvmet_root_type,
+ },
+ },
+};
+
+int __init nvmet_init_configfs(void)
+{
+ int ret;
+
+ config_group_init(&nvmet_configfs_subsystem.su_group);
+ mutex_init(&nvmet_configfs_subsystem.su_mutex);
+
+ config_group_init_type_name(&nvmet_subsystems_group,
+ "subsystems", &nvmet_subsystems_type);
+ configfs_add_default_group(&nvmet_subsystems_group,
+ &nvmet_configfs_subsystem.su_group);
+
+ config_group_init_type_name(&nvmet_ports_group,
+ "ports", &nvmet_ports_type);
+ configfs_add_default_group(&nvmet_ports_group,
+ &nvmet_configfs_subsystem.su_group);
+
+ config_group_init_type_name(&nvmet_hosts_group,
+ "hosts", &nvmet_hosts_type);
+ configfs_add_default_group(&nvmet_hosts_group,
+ &nvmet_configfs_subsystem.su_group);
+
+ ret = configfs_register_subsystem(&nvmet_configfs_subsystem);
+ if (ret) {
+ pr_err("configfs_register_subsystem: %d\n", ret);
+ return ret;
+ }
+
+ return 0;
+}
+
+void __exit nvmet_exit_configfs(void)
+{
+ configfs_unregister_subsystem(&nvmet_configfs_subsystem);
+}
diff --git a/src/kernel/linux/v4.14/drivers/nvme/target/core.c b/src/kernel/linux/v4.14/drivers/nvme/target/core.c
new file mode 100644
index 0000000..d0be85d
--- /dev/null
+++ b/src/kernel/linux/v4.14/drivers/nvme/target/core.c
@@ -0,0 +1,1047 @@
+/*
+ * Common code for the NVMe target.
+ * Copyright (c) 2015-2016 HGST, a Western Digital Company.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ */
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+#include <linux/module.h>
+#include <linux/random.h>
+#include <linux/rculist.h>
+
+#include "nvmet.h"
+
+static struct nvmet_fabrics_ops *nvmet_transports[NVMF_TRTYPE_MAX];
+static DEFINE_IDA(cntlid_ida);
+
+/*
+ * This read/write semaphore is used to synchronize access to configuration
+ * information on a target system that will result in discovery log page
+ * information change for at least one host.
+ * The full list of resources to protected by this semaphore is:
+ *
+ * - subsystems list
+ * - per-subsystem allowed hosts list
+ * - allow_any_host subsystem attribute
+ * - nvmet_genctr
+ * - the nvmet_transports array
+ *
+ * When updating any of those lists/structures write lock should be obtained,
+ * while when reading (popolating discovery log page or checking host-subsystem
+ * link) read lock is obtained to allow concurrent reads.
+ */
+DECLARE_RWSEM(nvmet_config_sem);
+
+static struct nvmet_subsys *nvmet_find_get_subsys(struct nvmet_port *port,
+ const char *subsysnqn);
+
+u16 nvmet_copy_to_sgl(struct nvmet_req *req, off_t off, const void *buf,
+ size_t len)
+{
+ if (sg_pcopy_from_buffer(req->sg, req->sg_cnt, buf, len, off) != len)
+ return NVME_SC_SGL_INVALID_DATA | NVME_SC_DNR;
+ return 0;
+}
+
+u16 nvmet_copy_from_sgl(struct nvmet_req *req, off_t off, void *buf, size_t len)
+{
+ if (sg_pcopy_to_buffer(req->sg, req->sg_cnt, buf, len, off) != len)
+ return NVME_SC_SGL_INVALID_DATA | NVME_SC_DNR;
+ return 0;
+}
+
+static u32 nvmet_async_event_result(struct nvmet_async_event *aen)
+{
+ return aen->event_type | (aen->event_info << 8) | (aen->log_page << 16);
+}
+
+static void nvmet_async_events_free(struct nvmet_ctrl *ctrl)
+{
+ struct nvmet_req *req;
+
+ while (1) {
+ mutex_lock(&ctrl->lock);
+ if (!ctrl->nr_async_event_cmds) {
+ mutex_unlock(&ctrl->lock);
+ return;
+ }
+
+ req = ctrl->async_event_cmds[--ctrl->nr_async_event_cmds];
+ mutex_unlock(&ctrl->lock);
+ nvmet_req_complete(req, NVME_SC_INTERNAL | NVME_SC_DNR);
+ }
+}
+
+static void nvmet_async_event_work(struct work_struct *work)
+{
+ struct nvmet_ctrl *ctrl =
+ container_of(work, struct nvmet_ctrl, async_event_work);
+ struct nvmet_async_event *aen;
+ struct nvmet_req *req;
+
+ while (1) {
+ mutex_lock(&ctrl->lock);
+ aen = list_first_entry_or_null(&ctrl->async_events,
+ struct nvmet_async_event, entry);
+ if (!aen || !ctrl->nr_async_event_cmds) {
+ mutex_unlock(&ctrl->lock);
+ return;
+ }
+
+ req = ctrl->async_event_cmds[--ctrl->nr_async_event_cmds];
+ nvmet_set_result(req, nvmet_async_event_result(aen));
+
+ list_del(&aen->entry);
+ kfree(aen);
+
+ mutex_unlock(&ctrl->lock);
+ nvmet_req_complete(req, 0);
+ }
+}
+
+static void nvmet_add_async_event(struct nvmet_ctrl *ctrl, u8 event_type,
+ u8 event_info, u8 log_page)
+{
+ struct nvmet_async_event *aen;
+
+ aen = kmalloc(sizeof(*aen), GFP_KERNEL);
+ if (!aen)
+ return;
+
+ aen->event_type = event_type;
+ aen->event_info = event_info;
+ aen->log_page = log_page;
+
+ mutex_lock(&ctrl->lock);
+ list_add_tail(&aen->entry, &ctrl->async_events);
+ mutex_unlock(&ctrl->lock);
+
+ schedule_work(&ctrl->async_event_work);
+}
+
+int nvmet_register_transport(struct nvmet_fabrics_ops *ops)
+{
+ int ret = 0;
+
+ down_write(&nvmet_config_sem);
+ if (nvmet_transports[ops->type])
+ ret = -EINVAL;
+ else
+ nvmet_transports[ops->type] = ops;
+ up_write(&nvmet_config_sem);
+
+ return ret;
+}
+EXPORT_SYMBOL_GPL(nvmet_register_transport);
+
+void nvmet_unregister_transport(struct nvmet_fabrics_ops *ops)
+{
+ down_write(&nvmet_config_sem);
+ nvmet_transports[ops->type] = NULL;
+ up_write(&nvmet_config_sem);
+}
+EXPORT_SYMBOL_GPL(nvmet_unregister_transport);
+
+int nvmet_enable_port(struct nvmet_port *port)
+{
+ struct nvmet_fabrics_ops *ops;
+ int ret;
+
+ lockdep_assert_held(&nvmet_config_sem);
+
+ ops = nvmet_transports[port->disc_addr.trtype];
+ if (!ops) {
+ up_write(&nvmet_config_sem);
+ request_module("nvmet-transport-%d", port->disc_addr.trtype);
+ down_write(&nvmet_config_sem);
+ ops = nvmet_transports[port->disc_addr.trtype];
+ if (!ops) {
+ pr_err("transport type %d not supported\n",
+ port->disc_addr.trtype);
+ return -EINVAL;
+ }
+ }
+
+ if (!try_module_get(ops->owner))
+ return -EINVAL;
+
+ ret = ops->add_port(port);
+ if (ret) {
+ module_put(ops->owner);
+ return ret;
+ }
+
+ port->enabled = true;
+ return 0;
+}
+
+void nvmet_disable_port(struct nvmet_port *port)
+{
+ struct nvmet_fabrics_ops *ops;
+
+ lockdep_assert_held(&nvmet_config_sem);
+
+ port->enabled = false;
+
+ ops = nvmet_transports[port->disc_addr.trtype];
+ ops->remove_port(port);
+ module_put(ops->owner);
+}
+
+static void nvmet_keep_alive_timer(struct work_struct *work)
+{
+ struct nvmet_ctrl *ctrl = container_of(to_delayed_work(work),
+ struct nvmet_ctrl, ka_work);
+
+ pr_err("ctrl %d keep-alive timer (%d seconds) expired!\n",
+ ctrl->cntlid, ctrl->kato);
+
+ nvmet_ctrl_fatal_error(ctrl);
+}
+
+static void nvmet_start_keep_alive_timer(struct nvmet_ctrl *ctrl)
+{
+ if (unlikely(ctrl->kato == 0))
+ return;
+
+ pr_debug("ctrl %d start keep-alive timer for %d secs\n",
+ ctrl->cntlid, ctrl->kato);
+
+ INIT_DELAYED_WORK(&ctrl->ka_work, nvmet_keep_alive_timer);
+ schedule_delayed_work(&ctrl->ka_work, ctrl->kato * HZ);
+}
+
+static void nvmet_stop_keep_alive_timer(struct nvmet_ctrl *ctrl)
+{
+ if (unlikely(ctrl->kato == 0))
+ return;
+
+ pr_debug("ctrl %d stop keep-alive\n", ctrl->cntlid);
+
+ cancel_delayed_work_sync(&ctrl->ka_work);
+}
+
+static struct nvmet_ns *__nvmet_find_namespace(struct nvmet_ctrl *ctrl,
+ __le32 nsid)
+{
+ struct nvmet_ns *ns;
+
+ list_for_each_entry_rcu(ns, &ctrl->subsys->namespaces, dev_link) {
+ if (ns->nsid == le32_to_cpu(nsid))
+ return ns;
+ }
+
+ return NULL;
+}
+
+struct nvmet_ns *nvmet_find_namespace(struct nvmet_ctrl *ctrl, __le32 nsid)
+{
+ struct nvmet_ns *ns;
+
+ rcu_read_lock();
+ ns = __nvmet_find_namespace(ctrl, nsid);
+ if (ns)
+ percpu_ref_get(&ns->ref);
+ rcu_read_unlock();
+
+ return ns;
+}
+
+static void nvmet_destroy_namespace(struct percpu_ref *ref)
+{
+ struct nvmet_ns *ns = container_of(ref, struct nvmet_ns, ref);
+
+ complete(&ns->disable_done);
+}
+
+void nvmet_put_namespace(struct nvmet_ns *ns)
+{
+ percpu_ref_put(&ns->ref);
+}
+
+int nvmet_ns_enable(struct nvmet_ns *ns)
+{
+ struct nvmet_subsys *subsys = ns->subsys;
+ struct nvmet_ctrl *ctrl;
+ int ret = 0;
+
+ mutex_lock(&subsys->lock);
+ if (ns->enabled)
+ goto out_unlock;
+
+ ns->bdev = blkdev_get_by_path(ns->device_path, FMODE_READ | FMODE_WRITE,
+ NULL);
+ if (IS_ERR(ns->bdev)) {
+ pr_err("failed to open block device %s: (%ld)\n",
+ ns->device_path, PTR_ERR(ns->bdev));
+ ret = PTR_ERR(ns->bdev);
+ ns->bdev = NULL;
+ goto out_unlock;
+ }
+
+ ns->size = i_size_read(ns->bdev->bd_inode);
+ ns->blksize_shift = blksize_bits(bdev_logical_block_size(ns->bdev));
+
+ ret = percpu_ref_init(&ns->ref, nvmet_destroy_namespace,
+ 0, GFP_KERNEL);
+ if (ret)
+ goto out_blkdev_put;
+
+ if (ns->nsid > subsys->max_nsid)
+ subsys->max_nsid = ns->nsid;
+
+ /*
+ * The namespaces list needs to be sorted to simplify the implementation
+ * of the Identify Namepace List subcommand.
+ */
+ if (list_empty(&subsys->namespaces)) {
+ list_add_tail_rcu(&ns->dev_link, &subsys->namespaces);
+ } else {
+ struct nvmet_ns *old;
+
+ list_for_each_entry_rcu(old, &subsys->namespaces, dev_link) {
+ BUG_ON(ns->nsid == old->nsid);
+ if (ns->nsid < old->nsid)
+ break;
+ }
+
+ list_add_tail_rcu(&ns->dev_link, &old->dev_link);
+ }
+
+ list_for_each_entry(ctrl, &subsys->ctrls, subsys_entry)
+ nvmet_add_async_event(ctrl, NVME_AER_TYPE_NOTICE, 0, 0);
+
+ ns->enabled = true;
+ ret = 0;
+out_unlock:
+ mutex_unlock(&subsys->lock);
+ return ret;
+out_blkdev_put:
+ blkdev_put(ns->bdev, FMODE_WRITE|FMODE_READ);
+ ns->bdev = NULL;
+ goto out_unlock;
+}
+
+void nvmet_ns_disable(struct nvmet_ns *ns)
+{
+ struct nvmet_subsys *subsys = ns->subsys;
+ struct nvmet_ctrl *ctrl;
+
+ mutex_lock(&subsys->lock);
+ if (!ns->enabled)
+ goto out_unlock;
+
+ ns->enabled = false;
+ list_del_rcu(&ns->dev_link);
+ mutex_unlock(&subsys->lock);
+
+ /*
+ * Now that we removed the namespaces from the lookup list, we
+ * can kill the per_cpu ref and wait for any remaining references
+ * to be dropped, as well as a RCU grace period for anyone only
+ * using the namepace under rcu_read_lock(). Note that we can't
+ * use call_rcu here as we need to ensure the namespaces have
+ * been fully destroyed before unloading the module.
+ */
+ percpu_ref_kill(&ns->ref);
+ synchronize_rcu();
+ wait_for_completion(&ns->disable_done);
+ percpu_ref_exit(&ns->ref);
+
+ mutex_lock(&subsys->lock);
+ list_for_each_entry(ctrl, &subsys->ctrls, subsys_entry)
+ nvmet_add_async_event(ctrl, NVME_AER_TYPE_NOTICE, 0, 0);
+
+ if (ns->bdev)
+ blkdev_put(ns->bdev, FMODE_WRITE|FMODE_READ);
+out_unlock:
+ mutex_unlock(&subsys->lock);
+}
+
+void nvmet_ns_free(struct nvmet_ns *ns)
+{
+ nvmet_ns_disable(ns);
+
+ kfree(ns->device_path);
+ kfree(ns);
+}
+
+struct nvmet_ns *nvmet_ns_alloc(struct nvmet_subsys *subsys, u32 nsid)
+{
+ struct nvmet_ns *ns;
+
+ ns = kzalloc(sizeof(*ns), GFP_KERNEL);
+ if (!ns)
+ return NULL;
+
+ INIT_LIST_HEAD(&ns->dev_link);
+ init_completion(&ns->disable_done);
+
+ ns->nsid = nsid;
+ ns->subsys = subsys;
+ uuid_gen(&ns->uuid);
+
+ return ns;
+}
+
+static void __nvmet_req_complete(struct nvmet_req *req, u16 status)
+{
+ u32 old_sqhd, new_sqhd;
+ u16 sqhd;
+
+ if (status)
+ nvmet_set_status(req, status);
+
+ if (req->sq->size) {
+ do {
+ old_sqhd = req->sq->sqhd;
+ new_sqhd = (old_sqhd + 1) % req->sq->size;
+ } while (cmpxchg(&req->sq->sqhd, old_sqhd, new_sqhd) !=
+ old_sqhd);
+ }
+ sqhd = req->sq->sqhd & 0x0000FFFF;
+ req->rsp->sq_head = cpu_to_le16(sqhd);
+ req->rsp->sq_id = cpu_to_le16(req->sq->qid);
+ req->rsp->command_id = req->cmd->common.command_id;
+
+ if (req->ns)
+ nvmet_put_namespace(req->ns);
+ req->ops->queue_response(req);
+}
+
+void nvmet_req_complete(struct nvmet_req *req, u16 status)
+{
+ __nvmet_req_complete(req, status);
+ percpu_ref_put(&req->sq->ref);
+}
+EXPORT_SYMBOL_GPL(nvmet_req_complete);
+
+void nvmet_cq_setup(struct nvmet_ctrl *ctrl, struct nvmet_cq *cq,
+ u16 qid, u16 size)
+{
+ cq->qid = qid;
+ cq->size = size;
+
+ ctrl->cqs[qid] = cq;
+}
+
+void nvmet_sq_setup(struct nvmet_ctrl *ctrl, struct nvmet_sq *sq,
+ u16 qid, u16 size)
+{
+ sq->sqhd = 0;
+ sq->qid = qid;
+ sq->size = size;
+
+ ctrl->sqs[qid] = sq;
+}
+
+static void nvmet_confirm_sq(struct percpu_ref *ref)
+{
+ struct nvmet_sq *sq = container_of(ref, struct nvmet_sq, ref);
+
+ complete(&sq->confirm_done);
+}
+
+void nvmet_sq_destroy(struct nvmet_sq *sq)
+{
+ /*
+ * If this is the admin queue, complete all AERs so that our
+ * queue doesn't have outstanding requests on it.
+ */
+ if (sq->ctrl && sq->ctrl->sqs && sq->ctrl->sqs[0] == sq)
+ nvmet_async_events_free(sq->ctrl);
+ percpu_ref_kill_and_confirm(&sq->ref, nvmet_confirm_sq);
+ wait_for_completion(&sq->confirm_done);
+ wait_for_completion(&sq->free_done);
+ percpu_ref_exit(&sq->ref);
+
+ if (sq->ctrl) {
+ nvmet_ctrl_put(sq->ctrl);
+ sq->ctrl = NULL; /* allows reusing the queue later */
+ }
+}
+EXPORT_SYMBOL_GPL(nvmet_sq_destroy);
+
+static void nvmet_sq_free(struct percpu_ref *ref)
+{
+ struct nvmet_sq *sq = container_of(ref, struct nvmet_sq, ref);
+
+ complete(&sq->free_done);
+}
+
+int nvmet_sq_init(struct nvmet_sq *sq)
+{
+ int ret;
+
+ ret = percpu_ref_init(&sq->ref, nvmet_sq_free, 0, GFP_KERNEL);
+ if (ret) {
+ pr_err("percpu_ref init failed!\n");
+ return ret;
+ }
+ init_completion(&sq->free_done);
+ init_completion(&sq->confirm_done);
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(nvmet_sq_init);
+
+bool nvmet_req_init(struct nvmet_req *req, struct nvmet_cq *cq,
+ struct nvmet_sq *sq, struct nvmet_fabrics_ops *ops)
+{
+ u8 flags = req->cmd->common.flags;
+ u16 status;
+
+ req->cq = cq;
+ req->sq = sq;
+ req->ops = ops;
+ req->sg = NULL;
+ req->sg_cnt = 0;
+ req->rsp->status = 0;
+
+ /* no support for fused commands yet */
+ if (unlikely(flags & (NVME_CMD_FUSE_FIRST | NVME_CMD_FUSE_SECOND))) {
+ status = NVME_SC_INVALID_FIELD | NVME_SC_DNR;
+ goto fail;
+ }
+
+ /*
+ * For fabrics, PSDT field shall describe metadata pointer (MPTR) that
+ * contains an address of a single contiguous physical buffer that is
+ * byte aligned.
+ */
+ if (unlikely((flags & NVME_CMD_SGL_ALL) != NVME_CMD_SGL_METABUF)) {
+ status = NVME_SC_INVALID_FIELD | NVME_SC_DNR;
+ goto fail;
+ }
+
+ if (unlikely(!req->sq->ctrl))
+ /* will return an error for any Non-connect command: */
+ status = nvmet_parse_connect_cmd(req);
+ else if (likely(req->sq->qid != 0))
+ status = nvmet_parse_io_cmd(req);
+ else if (req->cmd->common.opcode == nvme_fabrics_command)
+ status = nvmet_parse_fabrics_cmd(req);
+ else if (req->sq->ctrl->subsys->type == NVME_NQN_DISC)
+ status = nvmet_parse_discovery_cmd(req);
+ else
+ status = nvmet_parse_admin_cmd(req);
+
+ if (status)
+ goto fail;
+
+ if (unlikely(!percpu_ref_tryget_live(&sq->ref))) {
+ status = NVME_SC_INVALID_FIELD | NVME_SC_DNR;
+ goto fail;
+ }
+
+ return true;
+
+fail:
+ __nvmet_req_complete(req, status);
+ return false;
+}
+EXPORT_SYMBOL_GPL(nvmet_req_init);
+
+void nvmet_req_uninit(struct nvmet_req *req)
+{
+ percpu_ref_put(&req->sq->ref);
+}
+EXPORT_SYMBOL_GPL(nvmet_req_uninit);
+
+static inline bool nvmet_cc_en(u32 cc)
+{
+ return (cc >> NVME_CC_EN_SHIFT) & 0x1;
+}
+
+static inline u8 nvmet_cc_css(u32 cc)
+{
+ return (cc >> NVME_CC_CSS_SHIFT) & 0x7;
+}
+
+static inline u8 nvmet_cc_mps(u32 cc)
+{
+ return (cc >> NVME_CC_MPS_SHIFT) & 0xf;
+}
+
+static inline u8 nvmet_cc_ams(u32 cc)
+{
+ return (cc >> NVME_CC_AMS_SHIFT) & 0x7;
+}
+
+static inline u8 nvmet_cc_shn(u32 cc)
+{
+ return (cc >> NVME_CC_SHN_SHIFT) & 0x3;
+}
+
+static inline u8 nvmet_cc_iosqes(u32 cc)
+{
+ return (cc >> NVME_CC_IOSQES_SHIFT) & 0xf;
+}
+
+static inline u8 nvmet_cc_iocqes(u32 cc)
+{
+ return (cc >> NVME_CC_IOCQES_SHIFT) & 0xf;
+}
+
+static void nvmet_start_ctrl(struct nvmet_ctrl *ctrl)
+{
+ lockdep_assert_held(&ctrl->lock);
+
+ if (nvmet_cc_iosqes(ctrl->cc) != NVME_NVM_IOSQES ||
+ nvmet_cc_iocqes(ctrl->cc) != NVME_NVM_IOCQES ||
+ nvmet_cc_mps(ctrl->cc) != 0 ||
+ nvmet_cc_ams(ctrl->cc) != 0 ||
+ nvmet_cc_css(ctrl->cc) != 0) {
+ ctrl->csts = NVME_CSTS_CFS;
+ return;
+ }
+
+ ctrl->csts = NVME_CSTS_RDY;
+
+ /*
+ * Controllers that are not yet enabled should not really enforce the
+ * keep alive timeout, but we still want to track a timeout and cleanup
+ * in case a host died before it enabled the controller. Hence, simply
+ * reset the keep alive timer when the controller is enabled.
+ */
+ mod_delayed_work(system_wq, &ctrl->ka_work, ctrl->kato * HZ);
+}
+
+static void nvmet_clear_ctrl(struct nvmet_ctrl *ctrl)
+{
+ lockdep_assert_held(&ctrl->lock);
+
+ /* XXX: tear down queues? */
+ ctrl->csts &= ~NVME_CSTS_RDY;
+ ctrl->cc = 0;
+}
+
+void nvmet_update_cc(struct nvmet_ctrl *ctrl, u32 new)
+{
+ u32 old;
+
+ mutex_lock(&ctrl->lock);
+ old = ctrl->cc;
+ ctrl->cc = new;
+
+ if (nvmet_cc_en(new) && !nvmet_cc_en(old))
+ nvmet_start_ctrl(ctrl);
+ if (!nvmet_cc_en(new) && nvmet_cc_en(old))
+ nvmet_clear_ctrl(ctrl);
+ if (nvmet_cc_shn(new) && !nvmet_cc_shn(old)) {
+ nvmet_clear_ctrl(ctrl);
+ ctrl->csts |= NVME_CSTS_SHST_CMPLT;
+ }
+ if (!nvmet_cc_shn(new) && nvmet_cc_shn(old))
+ ctrl->csts &= ~NVME_CSTS_SHST_CMPLT;
+ mutex_unlock(&ctrl->lock);
+}
+
+static void nvmet_init_cap(struct nvmet_ctrl *ctrl)
+{
+ /* command sets supported: NVMe command set: */
+ ctrl->cap = (1ULL << 37);
+ /* CC.EN timeout in 500msec units: */
+ ctrl->cap |= (15ULL << 24);
+ /* maximum queue entries supported: */
+ ctrl->cap |= NVMET_QUEUE_SIZE - 1;
+}
+
+u16 nvmet_ctrl_find_get(const char *subsysnqn, const char *hostnqn, u16 cntlid,
+ struct nvmet_req *req, struct nvmet_ctrl **ret)
+{
+ struct nvmet_subsys *subsys;
+ struct nvmet_ctrl *ctrl;
+ u16 status = 0;
+
+ subsys = nvmet_find_get_subsys(req->port, subsysnqn);
+ if (!subsys) {
+ pr_warn("connect request for invalid subsystem %s!\n",
+ subsysnqn);
+ req->rsp->result.u32 = IPO_IATTR_CONNECT_DATA(subsysnqn);
+ return NVME_SC_CONNECT_INVALID_PARAM | NVME_SC_DNR;
+ }
+
+ mutex_lock(&subsys->lock);
+ list_for_each_entry(ctrl, &subsys->ctrls, subsys_entry) {
+ if (ctrl->cntlid == cntlid) {
+ if (strncmp(hostnqn, ctrl->hostnqn, NVMF_NQN_SIZE)) {
+ pr_warn("hostnqn mismatch.\n");
+ continue;
+ }
+ if (!kref_get_unless_zero(&ctrl->ref))
+ continue;
+
+ *ret = ctrl;
+ goto out;
+ }
+ }
+
+ pr_warn("could not find controller %d for subsys %s / host %s\n",
+ cntlid, subsysnqn, hostnqn);
+ req->rsp->result.u32 = IPO_IATTR_CONNECT_DATA(cntlid);
+ status = NVME_SC_CONNECT_INVALID_PARAM | NVME_SC_DNR;
+
+out:
+ mutex_unlock(&subsys->lock);
+ nvmet_subsys_put(subsys);
+ return status;
+}
+
+u16 nvmet_check_ctrl_status(struct nvmet_req *req, struct nvme_command *cmd)
+{
+ if (unlikely(!(req->sq->ctrl->cc & NVME_CC_ENABLE))) {
+ pr_err("got io cmd %d while CC.EN == 0 on qid = %d\n",
+ cmd->common.opcode, req->sq->qid);
+ return NVME_SC_CMD_SEQ_ERROR | NVME_SC_DNR;
+ }
+
+ if (unlikely(!(req->sq->ctrl->csts & NVME_CSTS_RDY))) {
+ pr_err("got io cmd %d while CSTS.RDY == 0 on qid = %d\n",
+ cmd->common.opcode, req->sq->qid);
+ req->ns = NULL;
+ return NVME_SC_CMD_SEQ_ERROR | NVME_SC_DNR;
+ }
+ return 0;
+}
+
+static bool __nvmet_host_allowed(struct nvmet_subsys *subsys,
+ const char *hostnqn)
+{
+ struct nvmet_host_link *p;
+
+ if (subsys->allow_any_host)
+ return true;
+
+ list_for_each_entry(p, &subsys->hosts, entry) {
+ if (!strcmp(nvmet_host_name(p->host), hostnqn))
+ return true;
+ }
+
+ return false;
+}
+
+static bool nvmet_host_discovery_allowed(struct nvmet_req *req,
+ const char *hostnqn)
+{
+ struct nvmet_subsys_link *s;
+
+ list_for_each_entry(s, &req->port->subsystems, entry) {
+ if (__nvmet_host_allowed(s->subsys, hostnqn))
+ return true;
+ }
+
+ return false;
+}
+
+bool nvmet_host_allowed(struct nvmet_req *req, struct nvmet_subsys *subsys,
+ const char *hostnqn)
+{
+ lockdep_assert_held(&nvmet_config_sem);
+
+ if (subsys->type == NVME_NQN_DISC)
+ return nvmet_host_discovery_allowed(req, hostnqn);
+ else
+ return __nvmet_host_allowed(subsys, hostnqn);
+}
+
+static void nvmet_fatal_error_handler(struct work_struct *work)
+{
+ struct nvmet_ctrl *ctrl =
+ container_of(work, struct nvmet_ctrl, fatal_err_work);
+
+ pr_err("ctrl %d fatal error occurred!\n", ctrl->cntlid);
+ ctrl->ops->delete_ctrl(ctrl);
+}
+
+u16 nvmet_alloc_ctrl(const char *subsysnqn, const char *hostnqn,
+ struct nvmet_req *req, u32 kato, struct nvmet_ctrl **ctrlp)
+{
+ struct nvmet_subsys *subsys;
+ struct nvmet_ctrl *ctrl;
+ int ret;
+ u16 status;
+
+ status = NVME_SC_CONNECT_INVALID_PARAM | NVME_SC_DNR;
+ subsys = nvmet_find_get_subsys(req->port, subsysnqn);
+ if (!subsys) {
+ pr_warn("connect request for invalid subsystem %s!\n",
+ subsysnqn);
+ req->rsp->result.u32 = IPO_IATTR_CONNECT_DATA(subsysnqn);
+ goto out;
+ }
+
+ status = NVME_SC_CONNECT_INVALID_PARAM | NVME_SC_DNR;
+ down_read(&nvmet_config_sem);
+ if (!nvmet_host_allowed(req, subsys, hostnqn)) {
+ pr_info("connect by host %s for subsystem %s not allowed\n",
+ hostnqn, subsysnqn);
+ req->rsp->result.u32 = IPO_IATTR_CONNECT_DATA(hostnqn);
+ up_read(&nvmet_config_sem);
+ status = NVME_SC_CONNECT_INVALID_HOST | NVME_SC_DNR;
+ goto out_put_subsystem;
+ }
+ up_read(&nvmet_config_sem);
+
+ status = NVME_SC_INTERNAL;
+ ctrl = kzalloc(sizeof(*ctrl), GFP_KERNEL);
+ if (!ctrl)
+ goto out_put_subsystem;
+ mutex_init(&ctrl->lock);
+
+ nvmet_init_cap(ctrl);
+
+ INIT_WORK(&ctrl->async_event_work, nvmet_async_event_work);
+ INIT_LIST_HEAD(&ctrl->async_events);
+ INIT_WORK(&ctrl->fatal_err_work, nvmet_fatal_error_handler);
+
+ memcpy(ctrl->subsysnqn, subsysnqn, NVMF_NQN_SIZE);
+ memcpy(ctrl->hostnqn, hostnqn, NVMF_NQN_SIZE);
+
+ kref_init(&ctrl->ref);
+ ctrl->subsys = subsys;
+
+ ctrl->cqs = kcalloc(subsys->max_qid + 1,
+ sizeof(struct nvmet_cq *),
+ GFP_KERNEL);
+ if (!ctrl->cqs)
+ goto out_free_ctrl;
+
+ ctrl->sqs = kcalloc(subsys->max_qid + 1,
+ sizeof(struct nvmet_sq *),
+ GFP_KERNEL);
+ if (!ctrl->sqs)
+ goto out_free_cqs;
+
+ ret = ida_simple_get(&cntlid_ida,
+ NVME_CNTLID_MIN, NVME_CNTLID_MAX,
+ GFP_KERNEL);
+ if (ret < 0) {
+ status = NVME_SC_CONNECT_CTRL_BUSY | NVME_SC_DNR;
+ goto out_free_sqs;
+ }
+ ctrl->cntlid = ret;
+
+ ctrl->ops = req->ops;
+ if (ctrl->subsys->type == NVME_NQN_DISC) {
+ /* Don't accept keep-alive timeout for discovery controllers */
+ if (kato) {
+ status = NVME_SC_INVALID_FIELD | NVME_SC_DNR;
+ goto out_free_sqs;
+ }
+
+ /*
+ * Discovery controllers use some arbitrary high value in order
+ * to cleanup stale discovery sessions
+ *
+ * From the latest base diff RC:
+ * "The Keep Alive command is not supported by
+ * Discovery controllers. A transport may specify a
+ * fixed Discovery controller activity timeout value
+ * (e.g., 2 minutes). If no commands are received
+ * by a Discovery controller within that time
+ * period, the controller may perform the
+ * actions for Keep Alive Timer expiration".
+ */
+ ctrl->kato = NVMET_DISC_KATO;
+ } else {
+ /* keep-alive timeout in seconds */
+ ctrl->kato = DIV_ROUND_UP(kato, 1000);
+ }
+ nvmet_start_keep_alive_timer(ctrl);
+
+ mutex_lock(&subsys->lock);
+ list_add_tail(&ctrl->subsys_entry, &subsys->ctrls);
+ mutex_unlock(&subsys->lock);
+
+ *ctrlp = ctrl;
+ return 0;
+
+out_free_sqs:
+ kfree(ctrl->sqs);
+out_free_cqs:
+ kfree(ctrl->cqs);
+out_free_ctrl:
+ kfree(ctrl);
+out_put_subsystem:
+ nvmet_subsys_put(subsys);
+out:
+ return status;
+}
+
+static void nvmet_ctrl_free(struct kref *ref)
+{
+ struct nvmet_ctrl *ctrl = container_of(ref, struct nvmet_ctrl, ref);
+ struct nvmet_subsys *subsys = ctrl->subsys;
+
+ nvmet_stop_keep_alive_timer(ctrl);
+
+ mutex_lock(&subsys->lock);
+ list_del(&ctrl->subsys_entry);
+ mutex_unlock(&subsys->lock);
+
+ flush_work(&ctrl->async_event_work);
+ cancel_work_sync(&ctrl->fatal_err_work);
+
+ ida_simple_remove(&cntlid_ida, ctrl->cntlid);
+ nvmet_subsys_put(subsys);
+
+ kfree(ctrl->sqs);
+ kfree(ctrl->cqs);
+ kfree(ctrl);
+}
+
+void nvmet_ctrl_put(struct nvmet_ctrl *ctrl)
+{
+ kref_put(&ctrl->ref, nvmet_ctrl_free);
+}
+
+void nvmet_ctrl_fatal_error(struct nvmet_ctrl *ctrl)
+{
+ mutex_lock(&ctrl->lock);
+ if (!(ctrl->csts & NVME_CSTS_CFS)) {
+ ctrl->csts |= NVME_CSTS_CFS;
+ schedule_work(&ctrl->fatal_err_work);
+ }
+ mutex_unlock(&ctrl->lock);
+}
+EXPORT_SYMBOL_GPL(nvmet_ctrl_fatal_error);
+
+static struct nvmet_subsys *nvmet_find_get_subsys(struct nvmet_port *port,
+ const char *subsysnqn)
+{
+ struct nvmet_subsys_link *p;
+
+ if (!port)
+ return NULL;
+
+ if (!strncmp(NVME_DISC_SUBSYS_NAME, subsysnqn,
+ NVMF_NQN_SIZE)) {
+ if (!kref_get_unless_zero(&nvmet_disc_subsys->ref))
+ return NULL;
+ return nvmet_disc_subsys;
+ }
+
+ down_read(&nvmet_config_sem);
+ list_for_each_entry(p, &port->subsystems, entry) {
+ if (!strncmp(p->subsys->subsysnqn, subsysnqn,
+ NVMF_NQN_SIZE)) {
+ if (!kref_get_unless_zero(&p->subsys->ref))
+ break;
+ up_read(&nvmet_config_sem);
+ return p->subsys;
+ }
+ }
+ up_read(&nvmet_config_sem);
+ return NULL;
+}
+
+struct nvmet_subsys *nvmet_subsys_alloc(const char *subsysnqn,
+ enum nvme_subsys_type type)
+{
+ struct nvmet_subsys *subsys;
+
+ subsys = kzalloc(sizeof(*subsys), GFP_KERNEL);
+ if (!subsys)
+ return NULL;
+
+ subsys->ver = NVME_VS(1, 3, 0); /* NVMe 1.3.0 */
+ /* generate a random serial number as our controllers are ephemeral: */
+ get_random_bytes(&subsys->serial, sizeof(subsys->serial));
+
+ switch (type) {
+ case NVME_NQN_NVME:
+ subsys->max_qid = NVMET_NR_QUEUES;
+ break;
+ case NVME_NQN_DISC:
+ subsys->max_qid = 0;
+ break;
+ default:
+ pr_err("%s: Unknown Subsystem type - %d\n", __func__, type);
+ kfree(subsys);
+ return NULL;
+ }
+ subsys->type = type;
+ subsys->subsysnqn = kstrndup(subsysnqn, NVMF_NQN_SIZE,
+ GFP_KERNEL);
+ if (!subsys->subsysnqn) {
+ kfree(subsys);
+ return NULL;
+ }
+
+ kref_init(&subsys->ref);
+
+ mutex_init(&subsys->lock);
+ INIT_LIST_HEAD(&subsys->namespaces);
+ INIT_LIST_HEAD(&subsys->ctrls);
+ INIT_LIST_HEAD(&subsys->hosts);
+
+ return subsys;
+}
+
+static void nvmet_subsys_free(struct kref *ref)
+{
+ struct nvmet_subsys *subsys =
+ container_of(ref, struct nvmet_subsys, ref);
+
+ WARN_ON_ONCE(!list_empty(&subsys->namespaces));
+
+ kfree(subsys->subsysnqn);
+ kfree(subsys);
+}
+
+void nvmet_subsys_del_ctrls(struct nvmet_subsys *subsys)
+{
+ struct nvmet_ctrl *ctrl;
+
+ mutex_lock(&subsys->lock);
+ list_for_each_entry(ctrl, &subsys->ctrls, subsys_entry)
+ ctrl->ops->delete_ctrl(ctrl);
+ mutex_unlock(&subsys->lock);
+}
+
+void nvmet_subsys_put(struct nvmet_subsys *subsys)
+{
+ kref_put(&subsys->ref, nvmet_subsys_free);
+}
+
+static int __init nvmet_init(void)
+{
+ int error;
+
+ error = nvmet_init_discovery();
+ if (error)
+ goto out;
+
+ error = nvmet_init_configfs();
+ if (error)
+ goto out_exit_discovery;
+ return 0;
+
+out_exit_discovery:
+ nvmet_exit_discovery();
+out:
+ return error;
+}
+
+static void __exit nvmet_exit(void)
+{
+ nvmet_exit_configfs();
+ nvmet_exit_discovery();
+ ida_destroy(&cntlid_ida);
+
+ BUILD_BUG_ON(sizeof(struct nvmf_disc_rsp_page_entry) != 1024);
+ BUILD_BUG_ON(sizeof(struct nvmf_disc_rsp_page_hdr) != 1024);
+}
+
+module_init(nvmet_init);
+module_exit(nvmet_exit);
+
+MODULE_LICENSE("GPL v2");
diff --git a/src/kernel/linux/v4.14/drivers/nvme/target/discovery.c b/src/kernel/linux/v4.14/drivers/nvme/target/discovery.c
new file mode 100644
index 0000000..8f3b57b
--- /dev/null
+++ b/src/kernel/linux/v4.14/drivers/nvme/target/discovery.c
@@ -0,0 +1,220 @@
+/*
+ * Discovery service for the NVMe over Fabrics target.
+ * Copyright (C) 2016 Intel Corporation. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License version
+ * 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+#include <linux/slab.h>
+#include <generated/utsrelease.h>
+#include "nvmet.h"
+
+struct nvmet_subsys *nvmet_disc_subsys;
+
+u64 nvmet_genctr;
+
+void nvmet_referral_enable(struct nvmet_port *parent, struct nvmet_port *port)
+{
+ down_write(&nvmet_config_sem);
+ if (list_empty(&port->entry)) {
+ list_add_tail(&port->entry, &parent->referrals);
+ port->enabled = true;
+ nvmet_genctr++;
+ }
+ up_write(&nvmet_config_sem);
+}
+
+void nvmet_referral_disable(struct nvmet_port *port)
+{
+ down_write(&nvmet_config_sem);
+ if (!list_empty(&port->entry)) {
+ port->enabled = false;
+ list_del_init(&port->entry);
+ nvmet_genctr++;
+ }
+ up_write(&nvmet_config_sem);
+}
+
+static void nvmet_format_discovery_entry(struct nvmf_disc_rsp_page_hdr *hdr,
+ struct nvmet_port *port, char *subsys_nqn, u8 type, u32 numrec)
+{
+ struct nvmf_disc_rsp_page_entry *e = &hdr->entries[numrec];
+
+ e->trtype = port->disc_addr.trtype;
+ e->adrfam = port->disc_addr.adrfam;
+ e->treq = port->disc_addr.treq;
+ e->portid = port->disc_addr.portid;
+ /* we support only dynamic controllers */
+ e->cntlid = cpu_to_le16(NVME_CNTLID_DYNAMIC);
+ e->asqsz = cpu_to_le16(NVME_AQ_DEPTH);
+ e->subtype = type;
+ memcpy(e->trsvcid, port->disc_addr.trsvcid, NVMF_TRSVCID_SIZE);
+ memcpy(e->traddr, port->disc_addr.traddr, NVMF_TRADDR_SIZE);
+ memcpy(e->tsas.common, port->disc_addr.tsas.common, NVMF_TSAS_SIZE);
+ memcpy(e->subnqn, subsys_nqn, NVMF_NQN_SIZE);
+}
+
+static void nvmet_execute_get_disc_log_page(struct nvmet_req *req)
+{
+ const int entry_size = sizeof(struct nvmf_disc_rsp_page_entry);
+ struct nvmet_ctrl *ctrl = req->sq->ctrl;
+ struct nvmf_disc_rsp_page_hdr *hdr;
+ size_t data_len = nvmet_get_log_page_len(req->cmd);
+ size_t alloc_len = max(data_len, sizeof(*hdr));
+ int residual_len = data_len - sizeof(*hdr);
+ struct nvmet_subsys_link *p;
+ struct nvmet_port *r;
+ u32 numrec = 0;
+ u16 status = 0;
+
+ /*
+ * Make sure we're passing at least a buffer of response header size.
+ * If host provided data len is less than the header size, only the
+ * number of bytes requested by host will be sent to host.
+ */
+ hdr = kzalloc(alloc_len, GFP_KERNEL);
+ if (!hdr) {
+ status = NVME_SC_INTERNAL;
+ goto out;
+ }
+
+ down_read(&nvmet_config_sem);
+ list_for_each_entry(p, &req->port->subsystems, entry) {
+ if (!nvmet_host_allowed(req, p->subsys, ctrl->hostnqn))
+ continue;
+ if (residual_len >= entry_size) {
+ nvmet_format_discovery_entry(hdr, req->port,
+ p->subsys->subsysnqn,
+ NVME_NQN_NVME, numrec);
+ residual_len -= entry_size;
+ }
+ numrec++;
+ }
+
+ list_for_each_entry(r, &req->port->referrals, entry) {
+ if (residual_len >= entry_size) {
+ nvmet_format_discovery_entry(hdr, r,
+ NVME_DISC_SUBSYS_NAME,
+ NVME_NQN_DISC, numrec);
+ residual_len -= entry_size;
+ }
+ numrec++;
+ }
+
+ hdr->genctr = cpu_to_le64(nvmet_genctr);
+ hdr->numrec = cpu_to_le64(numrec);
+ hdr->recfmt = cpu_to_le16(0);
+
+ up_read(&nvmet_config_sem);
+
+ status = nvmet_copy_to_sgl(req, 0, hdr, data_len);
+ kfree(hdr);
+out:
+ nvmet_req_complete(req, status);
+}
+
+static void nvmet_execute_identify_disc_ctrl(struct nvmet_req *req)
+{
+ struct nvmet_ctrl *ctrl = req->sq->ctrl;
+ struct nvme_id_ctrl *id;
+ u16 status = 0;
+
+ id = kzalloc(sizeof(*id), GFP_KERNEL);
+ if (!id) {
+ status = NVME_SC_INTERNAL;
+ goto out;
+ }
+
+ memset(id->fr, ' ', sizeof(id->fr));
+ strncpy((char *)id->fr, UTS_RELEASE, sizeof(id->fr));
+
+ /* no limit on data transfer sizes for now */
+ id->mdts = 0;
+ id->cntlid = cpu_to_le16(ctrl->cntlid);
+ id->ver = cpu_to_le32(ctrl->subsys->ver);
+ id->lpa = (1 << 2);
+
+ /* no enforcement soft-limit for maxcmd - pick arbitrary high value */
+ id->maxcmd = cpu_to_le16(NVMET_MAX_CMD);
+
+ id->sgls = cpu_to_le32(1 << 0); /* we always support SGLs */
+ if (ctrl->ops->has_keyed_sgls)
+ id->sgls |= cpu_to_le32(1 << 2);
+ if (ctrl->ops->sqe_inline_size)
+ id->sgls |= cpu_to_le32(1 << 20);
+
+ strcpy(id->subnqn, ctrl->subsys->subsysnqn);
+
+ status = nvmet_copy_to_sgl(req, 0, id, sizeof(*id));
+
+ kfree(id);
+out:
+ nvmet_req_complete(req, status);
+}
+
+u16 nvmet_parse_discovery_cmd(struct nvmet_req *req)
+{
+ struct nvme_command *cmd = req->cmd;
+
+ req->ns = NULL;
+
+ if (unlikely(!(req->sq->ctrl->csts & NVME_CSTS_RDY))) {
+ pr_err("got cmd %d while not ready\n",
+ cmd->common.opcode);
+ return NVME_SC_INVALID_OPCODE | NVME_SC_DNR;
+ }
+
+ switch (cmd->common.opcode) {
+ case nvme_admin_get_log_page:
+ req->data_len = nvmet_get_log_page_len(cmd);
+
+ switch (cmd->get_log_page.lid) {
+ case NVME_LOG_DISC:
+ req->execute = nvmet_execute_get_disc_log_page;
+ return 0;
+ default:
+ pr_err("unsupported get_log_page lid %d\n",
+ cmd->get_log_page.lid);
+ return NVME_SC_INVALID_OPCODE | NVME_SC_DNR;
+ }
+ case nvme_admin_identify:
+ req->data_len = NVME_IDENTIFY_DATA_SIZE;
+ switch (cmd->identify.cns) {
+ case NVME_ID_CNS_CTRL:
+ req->execute =
+ nvmet_execute_identify_disc_ctrl;
+ return 0;
+ default:
+ pr_err("unsupported identify cns %d\n",
+ cmd->identify.cns);
+ return NVME_SC_INVALID_OPCODE | NVME_SC_DNR;
+ }
+ default:
+ pr_err("unsupported cmd %d\n", cmd->common.opcode);
+ return NVME_SC_INVALID_OPCODE | NVME_SC_DNR;
+ }
+
+ pr_err("unhandled cmd %d\n", cmd->common.opcode);
+ return NVME_SC_INVALID_OPCODE | NVME_SC_DNR;
+}
+
+int __init nvmet_init_discovery(void)
+{
+ nvmet_disc_subsys =
+ nvmet_subsys_alloc(NVME_DISC_SUBSYS_NAME, NVME_NQN_DISC);
+ if (!nvmet_disc_subsys)
+ return -ENOMEM;
+ return 0;
+}
+
+void nvmet_exit_discovery(void)
+{
+ nvmet_subsys_put(nvmet_disc_subsys);
+}
diff --git a/src/kernel/linux/v4.14/drivers/nvme/target/fabrics-cmd.c b/src/kernel/linux/v4.14/drivers/nvme/target/fabrics-cmd.c
new file mode 100644
index 0000000..db3bf6b
--- /dev/null
+++ b/src/kernel/linux/v4.14/drivers/nvme/target/fabrics-cmd.c
@@ -0,0 +1,264 @@
+/*
+ * NVMe Fabrics command implementation.
+ * Copyright (c) 2015-2016 HGST, a Western Digital Company.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ */
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+#include <linux/blkdev.h>
+#include "nvmet.h"
+
+static void nvmet_execute_prop_set(struct nvmet_req *req)
+{
+ u16 status = 0;
+
+ if (!(req->cmd->prop_set.attrib & 1)) {
+ u64 val = le64_to_cpu(req->cmd->prop_set.value);
+
+ switch (le32_to_cpu(req->cmd->prop_set.offset)) {
+ case NVME_REG_CC:
+ nvmet_update_cc(req->sq->ctrl, val);
+ break;
+ default:
+ status = NVME_SC_INVALID_FIELD | NVME_SC_DNR;
+ break;
+ }
+ } else {
+ status = NVME_SC_INVALID_FIELD | NVME_SC_DNR;
+ }
+
+ nvmet_req_complete(req, status);
+}
+
+static void nvmet_execute_prop_get(struct nvmet_req *req)
+{
+ struct nvmet_ctrl *ctrl = req->sq->ctrl;
+ u16 status = 0;
+ u64 val = 0;
+
+ if (req->cmd->prop_get.attrib & 1) {
+ switch (le32_to_cpu(req->cmd->prop_get.offset)) {
+ case NVME_REG_CAP:
+ val = ctrl->cap;
+ break;
+ default:
+ status = NVME_SC_INVALID_FIELD | NVME_SC_DNR;
+ break;
+ }
+ } else {
+ switch (le32_to_cpu(req->cmd->prop_get.offset)) {
+ case NVME_REG_VS:
+ val = ctrl->subsys->ver;
+ break;
+ case NVME_REG_CC:
+ val = ctrl->cc;
+ break;
+ case NVME_REG_CSTS:
+ val = ctrl->csts;
+ break;
+ default:
+ status = NVME_SC_INVALID_FIELD | NVME_SC_DNR;
+ break;
+ }
+ }
+
+ req->rsp->result.u64 = cpu_to_le64(val);
+ nvmet_req_complete(req, status);
+}
+
+u16 nvmet_parse_fabrics_cmd(struct nvmet_req *req)
+{
+ struct nvme_command *cmd = req->cmd;
+
+ req->ns = NULL;
+
+ switch (cmd->fabrics.fctype) {
+ case nvme_fabrics_type_property_set:
+ req->data_len = 0;
+ req->execute = nvmet_execute_prop_set;
+ break;
+ case nvme_fabrics_type_property_get:
+ req->data_len = 0;
+ req->execute = nvmet_execute_prop_get;
+ break;
+ default:
+ pr_err("received unknown capsule type 0x%x\n",
+ cmd->fabrics.fctype);
+ return NVME_SC_INVALID_OPCODE | NVME_SC_DNR;
+ }
+
+ return 0;
+}
+
+static u16 nvmet_install_queue(struct nvmet_ctrl *ctrl, struct nvmet_req *req)
+{
+ struct nvmf_connect_command *c = &req->cmd->connect;
+ u16 qid = le16_to_cpu(c->qid);
+ u16 sqsize = le16_to_cpu(c->sqsize);
+ struct nvmet_ctrl *old;
+
+ old = cmpxchg(&req->sq->ctrl, NULL, ctrl);
+ if (old) {
+ pr_warn("queue already connected!\n");
+ return NVME_SC_CONNECT_CTRL_BUSY | NVME_SC_DNR;
+ }
+ if (!sqsize) {
+ pr_warn("queue size zero!\n");
+ return NVME_SC_CONNECT_INVALID_PARAM | NVME_SC_DNR;
+ }
+
+ /* note: convert queue size from 0's-based value to 1's-based value */
+ nvmet_cq_setup(ctrl, req->cq, qid, sqsize + 1);
+ nvmet_sq_setup(ctrl, req->sq, qid, sqsize + 1);
+ return 0;
+}
+
+static void nvmet_execute_admin_connect(struct nvmet_req *req)
+{
+ struct nvmf_connect_command *c = &req->cmd->connect;
+ struct nvmf_connect_data *d;
+ struct nvmet_ctrl *ctrl = NULL;
+ u16 status = 0;
+
+ d = kmalloc(sizeof(*d), GFP_KERNEL);
+ if (!d) {
+ status = NVME_SC_INTERNAL;
+ goto complete;
+ }
+
+ status = nvmet_copy_from_sgl(req, 0, d, sizeof(*d));
+ if (status)
+ goto out;
+
+ /* zero out initial completion result, assign values as needed */
+ req->rsp->result.u32 = 0;
+
+ if (c->recfmt != 0) {
+ pr_warn("invalid connect version (%d).\n",
+ le16_to_cpu(c->recfmt));
+ status = NVME_SC_CONNECT_FORMAT | NVME_SC_DNR;
+ goto out;
+ }
+
+ if (unlikely(d->cntlid != cpu_to_le16(0xffff))) {
+ pr_warn("connect attempt for invalid controller ID %#x\n",
+ d->cntlid);
+ status = NVME_SC_CONNECT_INVALID_PARAM | NVME_SC_DNR;
+ req->rsp->result.u32 = IPO_IATTR_CONNECT_DATA(cntlid);
+ goto out;
+ }
+
+ status = nvmet_alloc_ctrl(d->subsysnqn, d->hostnqn, req,
+ le32_to_cpu(c->kato), &ctrl);
+ if (status)
+ goto out;
+ uuid_copy(&ctrl->hostid, &d->hostid);
+
+ status = nvmet_install_queue(ctrl, req);
+ if (status) {
+ nvmet_ctrl_put(ctrl);
+ goto out;
+ }
+
+ pr_info("creating controller %d for subsystem %s for NQN %s.\n",
+ ctrl->cntlid, ctrl->subsys->subsysnqn, ctrl->hostnqn);
+ req->rsp->result.u16 = cpu_to_le16(ctrl->cntlid);
+
+out:
+ kfree(d);
+complete:
+ nvmet_req_complete(req, status);
+}
+
+static void nvmet_execute_io_connect(struct nvmet_req *req)
+{
+ struct nvmf_connect_command *c = &req->cmd->connect;
+ struct nvmf_connect_data *d;
+ struct nvmet_ctrl *ctrl = NULL;
+ u16 qid = le16_to_cpu(c->qid);
+ u16 status = 0;
+
+ d = kmalloc(sizeof(*d), GFP_KERNEL);
+ if (!d) {
+ status = NVME_SC_INTERNAL;
+ goto complete;
+ }
+
+ status = nvmet_copy_from_sgl(req, 0, d, sizeof(*d));
+ if (status)
+ goto out;
+
+ /* zero out initial completion result, assign values as needed */
+ req->rsp->result.u32 = 0;
+
+ if (c->recfmt != 0) {
+ pr_warn("invalid connect version (%d).\n",
+ le16_to_cpu(c->recfmt));
+ status = NVME_SC_CONNECT_FORMAT | NVME_SC_DNR;
+ goto out;
+ }
+
+ status = nvmet_ctrl_find_get(d->subsysnqn, d->hostnqn,
+ le16_to_cpu(d->cntlid),
+ req, &ctrl);
+ if (status)
+ goto out;
+
+ if (unlikely(qid > ctrl->subsys->max_qid)) {
+ pr_warn("invalid queue id (%d)\n", qid);
+ status = NVME_SC_CONNECT_INVALID_PARAM | NVME_SC_DNR;
+ req->rsp->result.u32 = IPO_IATTR_CONNECT_SQE(qid);
+ goto out_ctrl_put;
+ }
+
+ status = nvmet_install_queue(ctrl, req);
+ if (status) {
+ /* pass back cntlid that had the issue of installing queue */
+ req->rsp->result.u16 = cpu_to_le16(ctrl->cntlid);
+ goto out_ctrl_put;
+ }
+
+ pr_info("adding queue %d to ctrl %d.\n", qid, ctrl->cntlid);
+
+out:
+ kfree(d);
+complete:
+ nvmet_req_complete(req, status);
+ return;
+
+out_ctrl_put:
+ nvmet_ctrl_put(ctrl);
+ goto out;
+}
+
+u16 nvmet_parse_connect_cmd(struct nvmet_req *req)
+{
+ struct nvme_command *cmd = req->cmd;
+
+ req->ns = NULL;
+
+ if (cmd->common.opcode != nvme_fabrics_command) {
+ pr_err("invalid command 0x%x on unconnected queue.\n",
+ cmd->fabrics.opcode);
+ return NVME_SC_INVALID_OPCODE | NVME_SC_DNR;
+ }
+ if (cmd->fabrics.fctype != nvme_fabrics_type_connect) {
+ pr_err("invalid capsule type 0x%x on unconnected queue.\n",
+ cmd->fabrics.fctype);
+ return NVME_SC_INVALID_OPCODE | NVME_SC_DNR;
+ }
+
+ req->data_len = sizeof(struct nvmf_connect_data);
+ if (cmd->connect.qid == 0)
+ req->execute = nvmet_execute_admin_connect;
+ else
+ req->execute = nvmet_execute_io_connect;
+ return 0;
+}
diff --git a/src/kernel/linux/v4.14/drivers/nvme/target/fc.c b/src/kernel/linux/v4.14/drivers/nvme/target/fc.c
new file mode 100644
index 0000000..df1c6de
--- /dev/null
+++ b/src/kernel/linux/v4.14/drivers/nvme/target/fc.c
@@ -0,0 +1,2607 @@
+/*
+ * Copyright (c) 2016 Avago Technologies. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of version 2 of the GNU General Public License as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful.
+ * ALL EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND WARRANTIES,
+ * INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS FOR A
+ * PARTICULAR PURPOSE, OR NON-INFRINGEMENT, ARE DISCLAIMED, EXCEPT TO
+ * THE EXTENT THAT SUCH DISCLAIMERS ARE HELD TO BE LEGALLY INVALID.
+ * See the GNU General Public License for more details, a copy of which
+ * can be found in the file COPYING included with this package
+ *
+ */
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/blk-mq.h>
+#include <linux/parser.h>
+#include <linux/random.h>
+#include <uapi/scsi/fc/fc_fs.h>
+#include <uapi/scsi/fc/fc_els.h>
+
+#include "nvmet.h"
+#include <linux/nvme-fc-driver.h>
+#include <linux/nvme-fc.h>
+
+
+/* *************************** Data Structures/Defines ****************** */
+
+
+#define NVMET_LS_CTX_COUNT 4
+
+/* for this implementation, assume small single frame rqst/rsp */
+#define NVME_FC_MAX_LS_BUFFER_SIZE 2048
+
+struct nvmet_fc_tgtport;
+struct nvmet_fc_tgt_assoc;
+
+struct nvmet_fc_ls_iod {
+ struct nvmefc_tgt_ls_req *lsreq;
+ struct nvmefc_tgt_fcp_req *fcpreq; /* only if RS */
+
+ struct list_head ls_list; /* tgtport->ls_list */
+
+ struct nvmet_fc_tgtport *tgtport;
+ struct nvmet_fc_tgt_assoc *assoc;
+
+ u8 *rqstbuf;
+ u8 *rspbuf;
+ u16 rqstdatalen;
+ dma_addr_t rspdma;
+
+ struct scatterlist sg[2];
+
+ struct work_struct work;
+} __aligned(sizeof(unsigned long long));
+
+/* desired maximum for a single sequence - if sg list allows it */
+#define NVMET_FC_MAX_SEQ_LENGTH (256 * 1024)
+
+enum nvmet_fcp_datadir {
+ NVMET_FCP_NODATA,
+ NVMET_FCP_WRITE,
+ NVMET_FCP_READ,
+ NVMET_FCP_ABORTED,
+};
+
+struct nvmet_fc_fcp_iod {
+ struct nvmefc_tgt_fcp_req *fcpreq;
+
+ struct nvme_fc_cmd_iu cmdiubuf;
+ struct nvme_fc_ersp_iu rspiubuf;
+ dma_addr_t rspdma;
+ struct scatterlist *next_sg;
+ struct scatterlist *data_sg;
+ int data_sg_cnt;
+ u32 total_length;
+ u32 offset;
+ enum nvmet_fcp_datadir io_dir;
+ bool active;
+ bool abort;
+ bool aborted;
+ bool writedataactive;
+ spinlock_t flock;
+
+ struct nvmet_req req;
+ struct work_struct work;
+ struct work_struct done_work;
+
+ struct nvmet_fc_tgtport *tgtport;
+ struct nvmet_fc_tgt_queue *queue;
+
+ struct list_head fcp_list; /* tgtport->fcp_list */
+};
+
+struct nvmet_fc_tgtport {
+
+ struct nvmet_fc_target_port fc_target_port;
+
+ struct list_head tgt_list; /* nvmet_fc_target_list */
+ struct device *dev; /* dev for dma mapping */
+ struct nvmet_fc_target_template *ops;
+
+ struct nvmet_fc_ls_iod *iod;
+ spinlock_t lock;
+ struct list_head ls_list;
+ struct list_head ls_busylist;
+ struct list_head assoc_list;
+ struct ida assoc_cnt;
+ struct nvmet_port *port;
+ struct kref ref;
+ u32 max_sg_cnt;
+};
+
+struct nvmet_fc_defer_fcp_req {
+ struct list_head req_list;
+ struct nvmefc_tgt_fcp_req *fcp_req;
+};
+
+struct nvmet_fc_tgt_queue {
+ bool ninetypercent;
+ u16 qid;
+ u16 sqsize;
+ u16 ersp_ratio;
+ __le16 sqhd;
+ int cpu;
+ atomic_t connected;
+ atomic_t sqtail;
+ atomic_t zrspcnt;
+ atomic_t rsn;
+ spinlock_t qlock;
+ struct nvmet_port *port;
+ struct nvmet_cq nvme_cq;
+ struct nvmet_sq nvme_sq;
+ struct nvmet_fc_tgt_assoc *assoc;
+ struct nvmet_fc_fcp_iod *fod; /* array of fcp_iods */
+ struct list_head fod_list;
+ struct list_head pending_cmd_list;
+ struct list_head avail_defer_list;
+ struct workqueue_struct *work_q;
+ struct kref ref;
+} __aligned(sizeof(unsigned long long));
+
+struct nvmet_fc_tgt_assoc {
+ u64 association_id;
+ u32 a_id;
+ struct nvmet_fc_tgtport *tgtport;
+ struct list_head a_list;
+ struct nvmet_fc_tgt_queue *queues[NVMET_NR_QUEUES + 1];
+ struct kref ref;
+};
+
+
+static inline int
+nvmet_fc_iodnum(struct nvmet_fc_ls_iod *iodptr)
+{
+ return (iodptr - iodptr->tgtport->iod);
+}
+
+static inline int
+nvmet_fc_fodnum(struct nvmet_fc_fcp_iod *fodptr)
+{
+ return (fodptr - fodptr->queue->fod);
+}
+
+
+/*
+ * Association and Connection IDs:
+ *
+ * Association ID will have random number in upper 6 bytes and zero
+ * in lower 2 bytes
+ *
+ * Connection IDs will be Association ID with QID or'd in lower 2 bytes
+ *
+ * note: Association ID = Connection ID for queue 0
+ */
+#define BYTES_FOR_QID sizeof(u16)
+#define BYTES_FOR_QID_SHIFT (BYTES_FOR_QID * 8)
+#define NVMET_FC_QUEUEID_MASK ((u64)((1 << BYTES_FOR_QID_SHIFT) - 1))
+
+static inline u64
+nvmet_fc_makeconnid(struct nvmet_fc_tgt_assoc *assoc, u16 qid)
+{
+ return (assoc->association_id | qid);
+}
+
+static inline u64
+nvmet_fc_getassociationid(u64 connectionid)
+{
+ return connectionid & ~NVMET_FC_QUEUEID_MASK;
+}
+
+static inline u16
+nvmet_fc_getqueueid(u64 connectionid)
+{
+ return (u16)(connectionid & NVMET_FC_QUEUEID_MASK);
+}
+
+static inline struct nvmet_fc_tgtport *
+targetport_to_tgtport(struct nvmet_fc_target_port *targetport)
+{
+ return container_of(targetport, struct nvmet_fc_tgtport,
+ fc_target_port);
+}
+
+static inline struct nvmet_fc_fcp_iod *
+nvmet_req_to_fod(struct nvmet_req *nvme_req)
+{
+ return container_of(nvme_req, struct nvmet_fc_fcp_iod, req);
+}
+
+
+/* *************************** Globals **************************** */
+
+
+static DEFINE_SPINLOCK(nvmet_fc_tgtlock);
+
+static LIST_HEAD(nvmet_fc_target_list);
+static DEFINE_IDA(nvmet_fc_tgtport_cnt);
+
+
+static void nvmet_fc_handle_ls_rqst_work(struct work_struct *work);
+static void nvmet_fc_handle_fcp_rqst_work(struct work_struct *work);
+static void nvmet_fc_fcp_rqst_op_done_work(struct work_struct *work);
+static void nvmet_fc_tgt_a_put(struct nvmet_fc_tgt_assoc *assoc);
+static int nvmet_fc_tgt_a_get(struct nvmet_fc_tgt_assoc *assoc);
+static void nvmet_fc_tgt_q_put(struct nvmet_fc_tgt_queue *queue);
+static int nvmet_fc_tgt_q_get(struct nvmet_fc_tgt_queue *queue);
+static void nvmet_fc_tgtport_put(struct nvmet_fc_tgtport *tgtport);
+static int nvmet_fc_tgtport_get(struct nvmet_fc_tgtport *tgtport);
+static void nvmet_fc_handle_fcp_rqst(struct nvmet_fc_tgtport *tgtport,
+ struct nvmet_fc_fcp_iod *fod);
+
+
+/* *********************** FC-NVME DMA Handling **************************** */
+
+/*
+ * The fcloop device passes in a NULL device pointer. Real LLD's will
+ * pass in a valid device pointer. If NULL is passed to the dma mapping
+ * routines, depending on the platform, it may or may not succeed, and
+ * may crash.
+ *
+ * As such:
+ * Wrapper all the dma routines and check the dev pointer.
+ *
+ * If simple mappings (return just a dma address, we'll noop them,
+ * returning a dma address of 0.
+ *
+ * On more complex mappings (dma_map_sg), a pseudo routine fills
+ * in the scatter list, setting all dma addresses to 0.
+ */
+
+static inline dma_addr_t
+fc_dma_map_single(struct device *dev, void *ptr, size_t size,
+ enum dma_data_direction dir)
+{
+ return dev ? dma_map_single(dev, ptr, size, dir) : (dma_addr_t)0L;
+}
+
+static inline int
+fc_dma_mapping_error(struct device *dev, dma_addr_t dma_addr)
+{
+ return dev ? dma_mapping_error(dev, dma_addr) : 0;
+}
+
+static inline void
+fc_dma_unmap_single(struct device *dev, dma_addr_t addr, size_t size,
+ enum dma_data_direction dir)
+{
+ if (dev)
+ dma_unmap_single(dev, addr, size, dir);
+}
+
+static inline void
+fc_dma_sync_single_for_cpu(struct device *dev, dma_addr_t addr, size_t size,
+ enum dma_data_direction dir)
+{
+ if (dev)
+ dma_sync_single_for_cpu(dev, addr, size, dir);
+}
+
+static inline void
+fc_dma_sync_single_for_device(struct device *dev, dma_addr_t addr, size_t size,
+ enum dma_data_direction dir)
+{
+ if (dev)
+ dma_sync_single_for_device(dev, addr, size, dir);
+}
+
+/* pseudo dma_map_sg call */
+static int
+fc_map_sg(struct scatterlist *sg, int nents)
+{
+ struct scatterlist *s;
+ int i;
+
+ WARN_ON(nents == 0 || sg[0].length == 0);
+
+ for_each_sg(sg, s, nents, i) {
+ s->dma_address = 0L;
+#ifdef CONFIG_NEED_SG_DMA_LENGTH
+ s->dma_length = s->length;
+#endif
+ }
+ return nents;
+}
+
+static inline int
+fc_dma_map_sg(struct device *dev, struct scatterlist *sg, int nents,
+ enum dma_data_direction dir)
+{
+ return dev ? dma_map_sg(dev, sg, nents, dir) : fc_map_sg(sg, nents);
+}
+
+static inline void
+fc_dma_unmap_sg(struct device *dev, struct scatterlist *sg, int nents,
+ enum dma_data_direction dir)
+{
+ if (dev)
+ dma_unmap_sg(dev, sg, nents, dir);
+}
+
+
+/* *********************** FC-NVME Port Management ************************ */
+
+
+static int
+nvmet_fc_alloc_ls_iodlist(struct nvmet_fc_tgtport *tgtport)
+{
+ struct nvmet_fc_ls_iod *iod;
+ int i;
+
+ iod = kcalloc(NVMET_LS_CTX_COUNT, sizeof(struct nvmet_fc_ls_iod),
+ GFP_KERNEL);
+ if (!iod)
+ return -ENOMEM;
+
+ tgtport->iod = iod;
+
+ for (i = 0; i < NVMET_LS_CTX_COUNT; iod++, i++) {
+ INIT_WORK(&iod->work, nvmet_fc_handle_ls_rqst_work);
+ iod->tgtport = tgtport;
+ list_add_tail(&iod->ls_list, &tgtport->ls_list);
+
+ iod->rqstbuf = kcalloc(2, NVME_FC_MAX_LS_BUFFER_SIZE,
+ GFP_KERNEL);
+ if (!iod->rqstbuf)
+ goto out_fail;
+
+ iod->rspbuf = iod->rqstbuf + NVME_FC_MAX_LS_BUFFER_SIZE;
+
+ iod->rspdma = fc_dma_map_single(tgtport->dev, iod->rspbuf,
+ NVME_FC_MAX_LS_BUFFER_SIZE,
+ DMA_TO_DEVICE);
+ if (fc_dma_mapping_error(tgtport->dev, iod->rspdma))
+ goto out_fail;
+ }
+
+ return 0;
+
+out_fail:
+ kfree(iod->rqstbuf);
+ list_del(&iod->ls_list);
+ for (iod--, i--; i >= 0; iod--, i--) {
+ fc_dma_unmap_single(tgtport->dev, iod->rspdma,
+ NVME_FC_MAX_LS_BUFFER_SIZE, DMA_TO_DEVICE);
+ kfree(iod->rqstbuf);
+ list_del(&iod->ls_list);
+ }
+
+ kfree(iod);
+
+ return -EFAULT;
+}
+
+static void
+nvmet_fc_free_ls_iodlist(struct nvmet_fc_tgtport *tgtport)
+{
+ struct nvmet_fc_ls_iod *iod = tgtport->iod;
+ int i;
+
+ for (i = 0; i < NVMET_LS_CTX_COUNT; iod++, i++) {
+ fc_dma_unmap_single(tgtport->dev,
+ iod->rspdma, NVME_FC_MAX_LS_BUFFER_SIZE,
+ DMA_TO_DEVICE);
+ kfree(iod->rqstbuf);
+ list_del(&iod->ls_list);
+ }
+ kfree(tgtport->iod);
+}
+
+static struct nvmet_fc_ls_iod *
+nvmet_fc_alloc_ls_iod(struct nvmet_fc_tgtport *tgtport)
+{
+ struct nvmet_fc_ls_iod *iod;
+ unsigned long flags;
+
+ spin_lock_irqsave(&tgtport->lock, flags);
+ iod = list_first_entry_or_null(&tgtport->ls_list,
+ struct nvmet_fc_ls_iod, ls_list);
+ if (iod)
+ list_move_tail(&iod->ls_list, &tgtport->ls_busylist);
+ spin_unlock_irqrestore(&tgtport->lock, flags);
+ return iod;
+}
+
+
+static void
+nvmet_fc_free_ls_iod(struct nvmet_fc_tgtport *tgtport,
+ struct nvmet_fc_ls_iod *iod)
+{
+ unsigned long flags;
+
+ spin_lock_irqsave(&tgtport->lock, flags);
+ list_move(&iod->ls_list, &tgtport->ls_list);
+ spin_unlock_irqrestore(&tgtport->lock, flags);
+}
+
+static void
+nvmet_fc_prep_fcp_iodlist(struct nvmet_fc_tgtport *tgtport,
+ struct nvmet_fc_tgt_queue *queue)
+{
+ struct nvmet_fc_fcp_iod *fod = queue->fod;
+ int i;
+
+ for (i = 0; i < queue->sqsize; fod++, i++) {
+ INIT_WORK(&fod->work, nvmet_fc_handle_fcp_rqst_work);
+ INIT_WORK(&fod->done_work, nvmet_fc_fcp_rqst_op_done_work);
+ fod->tgtport = tgtport;
+ fod->queue = queue;
+ fod->active = false;
+ fod->abort = false;
+ fod->aborted = false;
+ fod->fcpreq = NULL;
+ list_add_tail(&fod->fcp_list, &queue->fod_list);
+ spin_lock_init(&fod->flock);
+
+ fod->rspdma = fc_dma_map_single(tgtport->dev, &fod->rspiubuf,
+ sizeof(fod->rspiubuf), DMA_TO_DEVICE);
+ if (fc_dma_mapping_error(tgtport->dev, fod->rspdma)) {
+ list_del(&fod->fcp_list);
+ for (fod--, i--; i >= 0; fod--, i--) {
+ fc_dma_unmap_single(tgtport->dev, fod->rspdma,
+ sizeof(fod->rspiubuf),
+ DMA_TO_DEVICE);
+ fod->rspdma = 0L;
+ list_del(&fod->fcp_list);
+ }
+
+ return;
+ }
+ }
+}
+
+static void
+nvmet_fc_destroy_fcp_iodlist(struct nvmet_fc_tgtport *tgtport,
+ struct nvmet_fc_tgt_queue *queue)
+{
+ struct nvmet_fc_fcp_iod *fod = queue->fod;
+ int i;
+
+ for (i = 0; i < queue->sqsize; fod++, i++) {
+ if (fod->rspdma)
+ fc_dma_unmap_single(tgtport->dev, fod->rspdma,
+ sizeof(fod->rspiubuf), DMA_TO_DEVICE);
+ }
+}
+
+static struct nvmet_fc_fcp_iod *
+nvmet_fc_alloc_fcp_iod(struct nvmet_fc_tgt_queue *queue)
+{
+ struct nvmet_fc_fcp_iod *fod;
+
+ lockdep_assert_held(&queue->qlock);
+
+ fod = list_first_entry_or_null(&queue->fod_list,
+ struct nvmet_fc_fcp_iod, fcp_list);
+ if (fod) {
+ list_del(&fod->fcp_list);
+ fod->active = true;
+ /*
+ * no queue reference is taken, as it was taken by the
+ * queue lookup just prior to the allocation. The iod
+ * will "inherit" that reference.
+ */
+ }
+ return fod;
+}
+
+
+static void
+nvmet_fc_queue_fcp_req(struct nvmet_fc_tgtport *tgtport,
+ struct nvmet_fc_tgt_queue *queue,
+ struct nvmefc_tgt_fcp_req *fcpreq)
+{
+ struct nvmet_fc_fcp_iod *fod = fcpreq->nvmet_fc_private;
+
+ /*
+ * put all admin cmds on hw queue id 0. All io commands go to
+ * the respective hw queue based on a modulo basis
+ */
+ fcpreq->hwqid = queue->qid ?
+ ((queue->qid - 1) % tgtport->ops->max_hw_queues) : 0;
+
+ if (tgtport->ops->target_features & NVMET_FCTGTFEAT_CMD_IN_ISR)
+ queue_work_on(queue->cpu, queue->work_q, &fod->work);
+ else
+ nvmet_fc_handle_fcp_rqst(tgtport, fod);
+}
+
+static void
+nvmet_fc_free_fcp_iod(struct nvmet_fc_tgt_queue *queue,
+ struct nvmet_fc_fcp_iod *fod)
+{
+ struct nvmefc_tgt_fcp_req *fcpreq = fod->fcpreq;
+ struct nvmet_fc_tgtport *tgtport = fod->tgtport;
+ struct nvmet_fc_defer_fcp_req *deferfcp;
+ unsigned long flags;
+
+ fc_dma_sync_single_for_cpu(tgtport->dev, fod->rspdma,
+ sizeof(fod->rspiubuf), DMA_TO_DEVICE);
+
+ fcpreq->nvmet_fc_private = NULL;
+
+ fod->active = false;
+ fod->abort = false;
+ fod->aborted = false;
+ fod->writedataactive = false;
+ fod->fcpreq = NULL;
+
+ tgtport->ops->fcp_req_release(&tgtport->fc_target_port, fcpreq);
+
+ /* release the queue lookup reference on the completed IO */
+ nvmet_fc_tgt_q_put(queue);
+
+ spin_lock_irqsave(&queue->qlock, flags);
+ deferfcp = list_first_entry_or_null(&queue->pending_cmd_list,
+ struct nvmet_fc_defer_fcp_req, req_list);
+ if (!deferfcp) {
+ list_add_tail(&fod->fcp_list, &fod->queue->fod_list);
+ spin_unlock_irqrestore(&queue->qlock, flags);
+ return;
+ }
+
+ /* Re-use the fod for the next pending cmd that was deferred */
+ list_del(&deferfcp->req_list);
+
+ fcpreq = deferfcp->fcp_req;
+
+ /* deferfcp can be reused for another IO at a later date */
+ list_add_tail(&deferfcp->req_list, &queue->avail_defer_list);
+
+ spin_unlock_irqrestore(&queue->qlock, flags);
+
+ /* Save NVME CMD IO in fod */
+ memcpy(&fod->cmdiubuf, fcpreq->rspaddr, fcpreq->rsplen);
+
+ /* Setup new fcpreq to be processed */
+ fcpreq->rspaddr = NULL;
+ fcpreq->rsplen = 0;
+ fcpreq->nvmet_fc_private = fod;
+ fod->fcpreq = fcpreq;
+ fod->active = true;
+
+ /* inform LLDD IO is now being processed */
+ tgtport->ops->defer_rcv(&tgtport->fc_target_port, fcpreq);
+
+ /* Submit deferred IO for processing */
+ nvmet_fc_queue_fcp_req(tgtport, queue, fcpreq);
+
+ /*
+ * Leave the queue lookup get reference taken when
+ * fod was originally allocated.
+ */
+}
+
+static int
+nvmet_fc_queue_to_cpu(struct nvmet_fc_tgtport *tgtport, int qid)
+{
+ int cpu, idx, cnt;
+
+ if (tgtport->ops->max_hw_queues == 1)
+ return WORK_CPU_UNBOUND;
+
+ /* Simple cpu selection based on qid modulo active cpu count */
+ idx = !qid ? 0 : (qid - 1) % num_active_cpus();
+
+ /* find the n'th active cpu */
+ for (cpu = 0, cnt = 0; ; ) {
+ if (cpu_active(cpu)) {
+ if (cnt == idx)
+ break;
+ cnt++;
+ }
+ cpu = (cpu + 1) % num_possible_cpus();
+ }
+
+ return cpu;
+}
+
+static struct nvmet_fc_tgt_queue *
+nvmet_fc_alloc_target_queue(struct nvmet_fc_tgt_assoc *assoc,
+ u16 qid, u16 sqsize)
+{
+ struct nvmet_fc_tgt_queue *queue;
+ unsigned long flags;
+ int ret;
+
+ if (qid > NVMET_NR_QUEUES)
+ return NULL;
+
+ queue = kzalloc((sizeof(*queue) +
+ (sizeof(struct nvmet_fc_fcp_iod) * sqsize)),
+ GFP_KERNEL);
+ if (!queue)
+ return NULL;
+
+ if (!nvmet_fc_tgt_a_get(assoc))
+ goto out_free_queue;
+
+ queue->work_q = alloc_workqueue("ntfc%d.%d.%d", 0, 0,
+ assoc->tgtport->fc_target_port.port_num,
+ assoc->a_id, qid);
+ if (!queue->work_q)
+ goto out_a_put;
+
+ queue->fod = (struct nvmet_fc_fcp_iod *)&queue[1];
+ queue->qid = qid;
+ queue->sqsize = sqsize;
+ queue->assoc = assoc;
+ queue->port = assoc->tgtport->port;
+ queue->cpu = nvmet_fc_queue_to_cpu(assoc->tgtport, qid);
+ INIT_LIST_HEAD(&queue->fod_list);
+ INIT_LIST_HEAD(&queue->avail_defer_list);
+ INIT_LIST_HEAD(&queue->pending_cmd_list);
+ atomic_set(&queue->connected, 0);
+ atomic_set(&queue->sqtail, 0);
+ atomic_set(&queue->rsn, 1);
+ atomic_set(&queue->zrspcnt, 0);
+ spin_lock_init(&queue->qlock);
+ kref_init(&queue->ref);
+
+ nvmet_fc_prep_fcp_iodlist(assoc->tgtport, queue);
+
+ ret = nvmet_sq_init(&queue->nvme_sq);
+ if (ret)
+ goto out_fail_iodlist;
+
+ WARN_ON(assoc->queues[qid]);
+ spin_lock_irqsave(&assoc->tgtport->lock, flags);
+ assoc->queues[qid] = queue;
+ spin_unlock_irqrestore(&assoc->tgtport->lock, flags);
+
+ return queue;
+
+out_fail_iodlist:
+ nvmet_fc_destroy_fcp_iodlist(assoc->tgtport, queue);
+ destroy_workqueue(queue->work_q);
+out_a_put:
+ nvmet_fc_tgt_a_put(assoc);
+out_free_queue:
+ kfree(queue);
+ return NULL;
+}
+
+
+static void
+nvmet_fc_tgt_queue_free(struct kref *ref)
+{
+ struct nvmet_fc_tgt_queue *queue =
+ container_of(ref, struct nvmet_fc_tgt_queue, ref);
+ unsigned long flags;
+
+ spin_lock_irqsave(&queue->assoc->tgtport->lock, flags);
+ queue->assoc->queues[queue->qid] = NULL;
+ spin_unlock_irqrestore(&queue->assoc->tgtport->lock, flags);
+
+ nvmet_fc_destroy_fcp_iodlist(queue->assoc->tgtport, queue);
+
+ nvmet_fc_tgt_a_put(queue->assoc);
+
+ destroy_workqueue(queue->work_q);
+
+ kfree(queue);
+}
+
+static void
+nvmet_fc_tgt_q_put(struct nvmet_fc_tgt_queue *queue)
+{
+ kref_put(&queue->ref, nvmet_fc_tgt_queue_free);
+}
+
+static int
+nvmet_fc_tgt_q_get(struct nvmet_fc_tgt_queue *queue)
+{
+ return kref_get_unless_zero(&queue->ref);
+}
+
+
+static void
+nvmet_fc_delete_target_queue(struct nvmet_fc_tgt_queue *queue)
+{
+ struct nvmet_fc_tgtport *tgtport = queue->assoc->tgtport;
+ struct nvmet_fc_fcp_iod *fod = queue->fod;
+ struct nvmet_fc_defer_fcp_req *deferfcp, *tempptr;
+ unsigned long flags;
+ int i, writedataactive;
+ bool disconnect;
+
+ disconnect = atomic_xchg(&queue->connected, 0);
+
+ spin_lock_irqsave(&queue->qlock, flags);
+ /* about outstanding io's */
+ for (i = 0; i < queue->sqsize; fod++, i++) {
+ if (fod->active) {
+ spin_lock(&fod->flock);
+ fod->abort = true;
+ writedataactive = fod->writedataactive;
+ spin_unlock(&fod->flock);
+ /*
+ * only call lldd abort routine if waiting for
+ * writedata. other outstanding ops should finish
+ * on their own.
+ */
+ if (writedataactive) {
+ spin_lock(&fod->flock);
+ fod->aborted = true;
+ spin_unlock(&fod->flock);
+ tgtport->ops->fcp_abort(
+ &tgtport->fc_target_port, fod->fcpreq);
+ }
+ }
+ }
+
+ /* Cleanup defer'ed IOs in queue */
+ list_for_each_entry_safe(deferfcp, tempptr, &queue->avail_defer_list,
+ req_list) {
+ list_del(&deferfcp->req_list);
+ kfree(deferfcp);
+ }
+
+ for (;;) {
+ deferfcp = list_first_entry_or_null(&queue->pending_cmd_list,
+ struct nvmet_fc_defer_fcp_req, req_list);
+ if (!deferfcp)
+ break;
+
+ list_del(&deferfcp->req_list);
+ spin_unlock_irqrestore(&queue->qlock, flags);
+
+ tgtport->ops->defer_rcv(&tgtport->fc_target_port,
+ deferfcp->fcp_req);
+
+ tgtport->ops->fcp_abort(&tgtport->fc_target_port,
+ deferfcp->fcp_req);
+
+ tgtport->ops->fcp_req_release(&tgtport->fc_target_port,
+ deferfcp->fcp_req);
+
+ /* release the queue lookup reference */
+ nvmet_fc_tgt_q_put(queue);
+
+ kfree(deferfcp);
+
+ spin_lock_irqsave(&queue->qlock, flags);
+ }
+ spin_unlock_irqrestore(&queue->qlock, flags);
+
+ flush_workqueue(queue->work_q);
+
+ if (disconnect)
+ nvmet_sq_destroy(&queue->nvme_sq);
+
+ nvmet_fc_tgt_q_put(queue);
+}
+
+static struct nvmet_fc_tgt_queue *
+nvmet_fc_find_target_queue(struct nvmet_fc_tgtport *tgtport,
+ u64 connection_id)
+{
+ struct nvmet_fc_tgt_assoc *assoc;
+ struct nvmet_fc_tgt_queue *queue;
+ u64 association_id = nvmet_fc_getassociationid(connection_id);
+ u16 qid = nvmet_fc_getqueueid(connection_id);
+ unsigned long flags;
+
+ if (qid > NVMET_NR_QUEUES)
+ return NULL;
+
+ spin_lock_irqsave(&tgtport->lock, flags);
+ list_for_each_entry(assoc, &tgtport->assoc_list, a_list) {
+ if (association_id == assoc->association_id) {
+ queue = assoc->queues[qid];
+ if (queue &&
+ (!atomic_read(&queue->connected) ||
+ !nvmet_fc_tgt_q_get(queue)))
+ queue = NULL;
+ spin_unlock_irqrestore(&tgtport->lock, flags);
+ return queue;
+ }
+ }
+ spin_unlock_irqrestore(&tgtport->lock, flags);
+ return NULL;
+}
+
+static struct nvmet_fc_tgt_assoc *
+nvmet_fc_alloc_target_assoc(struct nvmet_fc_tgtport *tgtport)
+{
+ struct nvmet_fc_tgt_assoc *assoc, *tmpassoc;
+ unsigned long flags;
+ u64 ran;
+ int idx;
+ bool needrandom = true;
+
+ assoc = kzalloc(sizeof(*assoc), GFP_KERNEL);
+ if (!assoc)
+ return NULL;
+
+ idx = ida_simple_get(&tgtport->assoc_cnt, 0, 0, GFP_KERNEL);
+ if (idx < 0)
+ goto out_free_assoc;
+
+ if (!nvmet_fc_tgtport_get(tgtport))
+ goto out_ida_put;
+
+ assoc->tgtport = tgtport;
+ assoc->a_id = idx;
+ INIT_LIST_HEAD(&assoc->a_list);
+ kref_init(&assoc->ref);
+
+ while (needrandom) {
+ get_random_bytes(&ran, sizeof(ran) - BYTES_FOR_QID);
+ ran = ran << BYTES_FOR_QID_SHIFT;
+
+ spin_lock_irqsave(&tgtport->lock, flags);
+ needrandom = false;
+ list_for_each_entry(tmpassoc, &tgtport->assoc_list, a_list)
+ if (ran == tmpassoc->association_id) {
+ needrandom = true;
+ break;
+ }
+ if (!needrandom) {
+ assoc->association_id = ran;
+ list_add_tail(&assoc->a_list, &tgtport->assoc_list);
+ }
+ spin_unlock_irqrestore(&tgtport->lock, flags);
+ }
+
+ return assoc;
+
+out_ida_put:
+ ida_simple_remove(&tgtport->assoc_cnt, idx);
+out_free_assoc:
+ kfree(assoc);
+ return NULL;
+}
+
+static void
+nvmet_fc_target_assoc_free(struct kref *ref)
+{
+ struct nvmet_fc_tgt_assoc *assoc =
+ container_of(ref, struct nvmet_fc_tgt_assoc, ref);
+ struct nvmet_fc_tgtport *tgtport = assoc->tgtport;
+ unsigned long flags;
+
+ spin_lock_irqsave(&tgtport->lock, flags);
+ list_del(&assoc->a_list);
+ spin_unlock_irqrestore(&tgtport->lock, flags);
+ ida_simple_remove(&tgtport->assoc_cnt, assoc->a_id);
+ kfree(assoc);
+ nvmet_fc_tgtport_put(tgtport);
+}
+
+static void
+nvmet_fc_tgt_a_put(struct nvmet_fc_tgt_assoc *assoc)
+{
+ kref_put(&assoc->ref, nvmet_fc_target_assoc_free);
+}
+
+static int
+nvmet_fc_tgt_a_get(struct nvmet_fc_tgt_assoc *assoc)
+{
+ return kref_get_unless_zero(&assoc->ref);
+}
+
+static void
+nvmet_fc_delete_target_assoc(struct nvmet_fc_tgt_assoc *assoc)
+{
+ struct nvmet_fc_tgtport *tgtport = assoc->tgtport;
+ struct nvmet_fc_tgt_queue *queue;
+ unsigned long flags;
+ int i;
+
+ spin_lock_irqsave(&tgtport->lock, flags);
+ for (i = NVMET_NR_QUEUES; i >= 0; i--) {
+ queue = assoc->queues[i];
+ if (queue) {
+ if (!nvmet_fc_tgt_q_get(queue))
+ continue;
+ spin_unlock_irqrestore(&tgtport->lock, flags);
+ nvmet_fc_delete_target_queue(queue);
+ nvmet_fc_tgt_q_put(queue);
+ spin_lock_irqsave(&tgtport->lock, flags);
+ }
+ }
+ spin_unlock_irqrestore(&tgtport->lock, flags);
+
+ nvmet_fc_tgt_a_put(assoc);
+}
+
+static struct nvmet_fc_tgt_assoc *
+nvmet_fc_find_target_assoc(struct nvmet_fc_tgtport *tgtport,
+ u64 association_id)
+{
+ struct nvmet_fc_tgt_assoc *assoc;
+ struct nvmet_fc_tgt_assoc *ret = NULL;
+ unsigned long flags;
+
+ spin_lock_irqsave(&tgtport->lock, flags);
+ list_for_each_entry(assoc, &tgtport->assoc_list, a_list) {
+ if (association_id == assoc->association_id) {
+ ret = assoc;
+ nvmet_fc_tgt_a_get(assoc);
+ break;
+ }
+ }
+ spin_unlock_irqrestore(&tgtport->lock, flags);
+
+ return ret;
+}
+
+
+/**
+ * nvme_fc_register_targetport - transport entry point called by an
+ * LLDD to register the existence of a local
+ * NVME subystem FC port.
+ * @pinfo: pointer to information about the port to be registered
+ * @template: LLDD entrypoints and operational parameters for the port
+ * @dev: physical hardware device node port corresponds to. Will be
+ * used for DMA mappings
+ * @portptr: pointer to a local port pointer. Upon success, the routine
+ * will allocate a nvme_fc_local_port structure and place its
+ * address in the local port pointer. Upon failure, local port
+ * pointer will be set to NULL.
+ *
+ * Returns:
+ * a completion status. Must be 0 upon success; a negative errno
+ * (ex: -ENXIO) upon failure.
+ */
+int
+nvmet_fc_register_targetport(struct nvmet_fc_port_info *pinfo,
+ struct nvmet_fc_target_template *template,
+ struct device *dev,
+ struct nvmet_fc_target_port **portptr)
+{
+ struct nvmet_fc_tgtport *newrec;
+ unsigned long flags;
+ int ret, idx;
+
+ if (!template->xmt_ls_rsp || !template->fcp_op ||
+ !template->fcp_abort ||
+ !template->fcp_req_release || !template->targetport_delete ||
+ !template->max_hw_queues || !template->max_sgl_segments ||
+ !template->max_dif_sgl_segments || !template->dma_boundary) {
+ ret = -EINVAL;
+ goto out_regtgt_failed;
+ }
+
+ newrec = kzalloc((sizeof(*newrec) + template->target_priv_sz),
+ GFP_KERNEL);
+ if (!newrec) {
+ ret = -ENOMEM;
+ goto out_regtgt_failed;
+ }
+
+ idx = ida_simple_get(&nvmet_fc_tgtport_cnt, 0, 0, GFP_KERNEL);
+ if (idx < 0) {
+ ret = -ENOSPC;
+ goto out_fail_kfree;
+ }
+
+ if (!get_device(dev) && dev) {
+ ret = -ENODEV;
+ goto out_ida_put;
+ }
+
+ newrec->fc_target_port.node_name = pinfo->node_name;
+ newrec->fc_target_port.port_name = pinfo->port_name;
+ newrec->fc_target_port.private = &newrec[1];
+ newrec->fc_target_port.port_id = pinfo->port_id;
+ newrec->fc_target_port.port_num = idx;
+ INIT_LIST_HEAD(&newrec->tgt_list);
+ newrec->dev = dev;
+ newrec->ops = template;
+ spin_lock_init(&newrec->lock);
+ INIT_LIST_HEAD(&newrec->ls_list);
+ INIT_LIST_HEAD(&newrec->ls_busylist);
+ INIT_LIST_HEAD(&newrec->assoc_list);
+ kref_init(&newrec->ref);
+ ida_init(&newrec->assoc_cnt);
+ newrec->max_sg_cnt = template->max_sgl_segments;
+
+ ret = nvmet_fc_alloc_ls_iodlist(newrec);
+ if (ret) {
+ ret = -ENOMEM;
+ goto out_free_newrec;
+ }
+
+ spin_lock_irqsave(&nvmet_fc_tgtlock, flags);
+ list_add_tail(&newrec->tgt_list, &nvmet_fc_target_list);
+ spin_unlock_irqrestore(&nvmet_fc_tgtlock, flags);
+
+ *portptr = &newrec->fc_target_port;
+ return 0;
+
+out_free_newrec:
+ put_device(dev);
+out_ida_put:
+ ida_simple_remove(&nvmet_fc_tgtport_cnt, idx);
+out_fail_kfree:
+ kfree(newrec);
+out_regtgt_failed:
+ *portptr = NULL;
+ return ret;
+}
+EXPORT_SYMBOL_GPL(nvmet_fc_register_targetport);
+
+
+static void
+nvmet_fc_free_tgtport(struct kref *ref)
+{
+ struct nvmet_fc_tgtport *tgtport =
+ container_of(ref, struct nvmet_fc_tgtport, ref);
+ struct device *dev = tgtport->dev;
+ unsigned long flags;
+
+ spin_lock_irqsave(&nvmet_fc_tgtlock, flags);
+ list_del(&tgtport->tgt_list);
+ spin_unlock_irqrestore(&nvmet_fc_tgtlock, flags);
+
+ nvmet_fc_free_ls_iodlist(tgtport);
+
+ /* let the LLDD know we've finished tearing it down */
+ tgtport->ops->targetport_delete(&tgtport->fc_target_port);
+
+ ida_simple_remove(&nvmet_fc_tgtport_cnt,
+ tgtport->fc_target_port.port_num);
+
+ ida_destroy(&tgtport->assoc_cnt);
+
+ kfree(tgtport);
+
+ put_device(dev);
+}
+
+static void
+nvmet_fc_tgtport_put(struct nvmet_fc_tgtport *tgtport)
+{
+ kref_put(&tgtport->ref, nvmet_fc_free_tgtport);
+}
+
+static int
+nvmet_fc_tgtport_get(struct nvmet_fc_tgtport *tgtport)
+{
+ return kref_get_unless_zero(&tgtport->ref);
+}
+
+static void
+__nvmet_fc_free_assocs(struct nvmet_fc_tgtport *tgtport)
+{
+ struct nvmet_fc_tgt_assoc *assoc, *next;
+ unsigned long flags;
+
+ spin_lock_irqsave(&tgtport->lock, flags);
+ list_for_each_entry_safe(assoc, next,
+ &tgtport->assoc_list, a_list) {
+ if (!nvmet_fc_tgt_a_get(assoc))
+ continue;
+ spin_unlock_irqrestore(&tgtport->lock, flags);
+ nvmet_fc_delete_target_assoc(assoc);
+ nvmet_fc_tgt_a_put(assoc);
+ spin_lock_irqsave(&tgtport->lock, flags);
+ }
+ spin_unlock_irqrestore(&tgtport->lock, flags);
+}
+
+/*
+ * nvmet layer has called to terminate an association
+ */
+static void
+nvmet_fc_delete_ctrl(struct nvmet_ctrl *ctrl)
+{
+ struct nvmet_fc_tgtport *tgtport, *next;
+ struct nvmet_fc_tgt_assoc *assoc;
+ struct nvmet_fc_tgt_queue *queue;
+ unsigned long flags;
+ bool found_ctrl = false;
+
+ /* this is a bit ugly, but don't want to make locks layered */
+ spin_lock_irqsave(&nvmet_fc_tgtlock, flags);
+ list_for_each_entry_safe(tgtport, next, &nvmet_fc_target_list,
+ tgt_list) {
+ if (!nvmet_fc_tgtport_get(tgtport))
+ continue;
+ spin_unlock_irqrestore(&nvmet_fc_tgtlock, flags);
+
+ spin_lock_irqsave(&tgtport->lock, flags);
+ list_for_each_entry(assoc, &tgtport->assoc_list, a_list) {
+ queue = assoc->queues[0];
+ if (queue && queue->nvme_sq.ctrl == ctrl) {
+ if (nvmet_fc_tgt_a_get(assoc))
+ found_ctrl = true;
+ break;
+ }
+ }
+ spin_unlock_irqrestore(&tgtport->lock, flags);
+
+ nvmet_fc_tgtport_put(tgtport);
+
+ if (found_ctrl) {
+ nvmet_fc_delete_target_assoc(assoc);
+ nvmet_fc_tgt_a_put(assoc);
+ return;
+ }
+
+ spin_lock_irqsave(&nvmet_fc_tgtlock, flags);
+ }
+ spin_unlock_irqrestore(&nvmet_fc_tgtlock, flags);
+}
+
+/**
+ * nvme_fc_unregister_targetport - transport entry point called by an
+ * LLDD to deregister/remove a previously
+ * registered a local NVME subsystem FC port.
+ * @tgtport: pointer to the (registered) target port that is to be
+ * deregistered.
+ *
+ * Returns:
+ * a completion status. Must be 0 upon success; a negative errno
+ * (ex: -ENXIO) upon failure.
+ */
+int
+nvmet_fc_unregister_targetport(struct nvmet_fc_target_port *target_port)
+{
+ struct nvmet_fc_tgtport *tgtport = targetport_to_tgtport(target_port);
+
+ /* terminate any outstanding associations */
+ __nvmet_fc_free_assocs(tgtport);
+
+ nvmet_fc_tgtport_put(tgtport);
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(nvmet_fc_unregister_targetport);
+
+
+/* *********************** FC-NVME LS Handling **************************** */
+
+
+static void
+nvmet_fc_format_rsp_hdr(void *buf, u8 ls_cmd, __be32 desc_len, u8 rqst_ls_cmd)
+{
+ struct fcnvme_ls_acc_hdr *acc = buf;
+
+ acc->w0.ls_cmd = ls_cmd;
+ acc->desc_list_len = desc_len;
+ acc->rqst.desc_tag = cpu_to_be32(FCNVME_LSDESC_RQST);
+ acc->rqst.desc_len =
+ fcnvme_lsdesc_len(sizeof(struct fcnvme_lsdesc_rqst));
+ acc->rqst.w0.ls_cmd = rqst_ls_cmd;
+}
+
+static int
+nvmet_fc_format_rjt(void *buf, u16 buflen, u8 ls_cmd,
+ u8 reason, u8 explanation, u8 vendor)
+{
+ struct fcnvme_ls_rjt *rjt = buf;
+
+ nvmet_fc_format_rsp_hdr(buf, FCNVME_LSDESC_RQST,
+ fcnvme_lsdesc_len(sizeof(struct fcnvme_ls_rjt)),
+ ls_cmd);
+ rjt->rjt.desc_tag = cpu_to_be32(FCNVME_LSDESC_RJT);
+ rjt->rjt.desc_len = fcnvme_lsdesc_len(sizeof(struct fcnvme_lsdesc_rjt));
+ rjt->rjt.reason_code = reason;
+ rjt->rjt.reason_explanation = explanation;
+ rjt->rjt.vendor = vendor;
+
+ return sizeof(struct fcnvme_ls_rjt);
+}
+
+/* Validation Error indexes into the string table below */
+enum {
+ VERR_NO_ERROR = 0,
+ VERR_CR_ASSOC_LEN = 1,
+ VERR_CR_ASSOC_RQST_LEN = 2,
+ VERR_CR_ASSOC_CMD = 3,
+ VERR_CR_ASSOC_CMD_LEN = 4,
+ VERR_ERSP_RATIO = 5,
+ VERR_ASSOC_ALLOC_FAIL = 6,
+ VERR_QUEUE_ALLOC_FAIL = 7,
+ VERR_CR_CONN_LEN = 8,
+ VERR_CR_CONN_RQST_LEN = 9,
+ VERR_ASSOC_ID = 10,
+ VERR_ASSOC_ID_LEN = 11,
+ VERR_NO_ASSOC = 12,
+ VERR_CONN_ID = 13,
+ VERR_CONN_ID_LEN = 14,
+ VERR_NO_CONN = 15,
+ VERR_CR_CONN_CMD = 16,
+ VERR_CR_CONN_CMD_LEN = 17,
+ VERR_DISCONN_LEN = 18,
+ VERR_DISCONN_RQST_LEN = 19,
+ VERR_DISCONN_CMD = 20,
+ VERR_DISCONN_CMD_LEN = 21,
+ VERR_DISCONN_SCOPE = 22,
+ VERR_RS_LEN = 23,
+ VERR_RS_RQST_LEN = 24,
+ VERR_RS_CMD = 25,
+ VERR_RS_CMD_LEN = 26,
+ VERR_RS_RCTL = 27,
+ VERR_RS_RO = 28,
+};
+
+static char *validation_errors[] = {
+ "OK",
+ "Bad CR_ASSOC Length",
+ "Bad CR_ASSOC Rqst Length",
+ "Not CR_ASSOC Cmd",
+ "Bad CR_ASSOC Cmd Length",
+ "Bad Ersp Ratio",
+ "Association Allocation Failed",
+ "Queue Allocation Failed",
+ "Bad CR_CONN Length",
+ "Bad CR_CONN Rqst Length",
+ "Not Association ID",
+ "Bad Association ID Length",
+ "No Association",
+ "Not Connection ID",
+ "Bad Connection ID Length",
+ "No Connection",
+ "Not CR_CONN Cmd",
+ "Bad CR_CONN Cmd Length",
+ "Bad DISCONN Length",
+ "Bad DISCONN Rqst Length",
+ "Not DISCONN Cmd",
+ "Bad DISCONN Cmd Length",
+ "Bad Disconnect Scope",
+ "Bad RS Length",
+ "Bad RS Rqst Length",
+ "Not RS Cmd",
+ "Bad RS Cmd Length",
+ "Bad RS R_CTL",
+ "Bad RS Relative Offset",
+};
+
+static void
+nvmet_fc_ls_create_association(struct nvmet_fc_tgtport *tgtport,
+ struct nvmet_fc_ls_iod *iod)
+{
+ struct fcnvme_ls_cr_assoc_rqst *rqst =
+ (struct fcnvme_ls_cr_assoc_rqst *)iod->rqstbuf;
+ struct fcnvme_ls_cr_assoc_acc *acc =
+ (struct fcnvme_ls_cr_assoc_acc *)iod->rspbuf;
+ struct nvmet_fc_tgt_queue *queue;
+ int ret = 0;
+
+ memset(acc, 0, sizeof(*acc));
+
+ /*
+ * FC-NVME spec changes. There are initiators sending different
+ * lengths as padding sizes for Create Association Cmd descriptor
+ * was incorrect.
+ * Accept anything of "minimum" length. Assume format per 1.15
+ * spec (with HOSTID reduced to 16 bytes), ignore how long the
+ * trailing pad length is.
+ */
+ if (iod->rqstdatalen < FCNVME_LSDESC_CRA_RQST_MINLEN)
+ ret = VERR_CR_ASSOC_LEN;
+ else if (be32_to_cpu(rqst->desc_list_len) <
+ FCNVME_LSDESC_CRA_RQST_MIN_LISTLEN)
+ ret = VERR_CR_ASSOC_RQST_LEN;
+ else if (rqst->assoc_cmd.desc_tag !=
+ cpu_to_be32(FCNVME_LSDESC_CREATE_ASSOC_CMD))
+ ret = VERR_CR_ASSOC_CMD;
+ else if (be32_to_cpu(rqst->assoc_cmd.desc_len) <
+ FCNVME_LSDESC_CRA_CMD_DESC_MIN_DESCLEN)
+ ret = VERR_CR_ASSOC_CMD_LEN;
+ else if (!rqst->assoc_cmd.ersp_ratio ||
+ (be16_to_cpu(rqst->assoc_cmd.ersp_ratio) >=
+ be16_to_cpu(rqst->assoc_cmd.sqsize)))
+ ret = VERR_ERSP_RATIO;
+
+ else {
+ /* new association w/ admin queue */
+ iod->assoc = nvmet_fc_alloc_target_assoc(tgtport);
+ if (!iod->assoc)
+ ret = VERR_ASSOC_ALLOC_FAIL;
+ else {
+ queue = nvmet_fc_alloc_target_queue(iod->assoc, 0,
+ be16_to_cpu(rqst->assoc_cmd.sqsize));
+ if (!queue)
+ ret = VERR_QUEUE_ALLOC_FAIL;
+ }
+ }
+
+ if (ret) {
+ dev_err(tgtport->dev,
+ "Create Association LS failed: %s\n",
+ validation_errors[ret]);
+ iod->lsreq->rsplen = nvmet_fc_format_rjt(acc,
+ NVME_FC_MAX_LS_BUFFER_SIZE, rqst->w0.ls_cmd,
+ FCNVME_RJT_RC_LOGIC,
+ FCNVME_RJT_EXP_NONE, 0);
+ return;
+ }
+
+ queue->ersp_ratio = be16_to_cpu(rqst->assoc_cmd.ersp_ratio);
+ atomic_set(&queue->connected, 1);
+ queue->sqhd = 0; /* best place to init value */
+
+ /* format a response */
+
+ iod->lsreq->rsplen = sizeof(*acc);
+
+ nvmet_fc_format_rsp_hdr(acc, FCNVME_LS_ACC,
+ fcnvme_lsdesc_len(
+ sizeof(struct fcnvme_ls_cr_assoc_acc)),
+ FCNVME_LS_CREATE_ASSOCIATION);
+ acc->associd.desc_tag = cpu_to_be32(FCNVME_LSDESC_ASSOC_ID);
+ acc->associd.desc_len =
+ fcnvme_lsdesc_len(
+ sizeof(struct fcnvme_lsdesc_assoc_id));
+ acc->associd.association_id =
+ cpu_to_be64(nvmet_fc_makeconnid(iod->assoc, 0));
+ acc->connectid.desc_tag = cpu_to_be32(FCNVME_LSDESC_CONN_ID);
+ acc->connectid.desc_len =
+ fcnvme_lsdesc_len(
+ sizeof(struct fcnvme_lsdesc_conn_id));
+ acc->connectid.connection_id = acc->associd.association_id;
+}
+
+static void
+nvmet_fc_ls_create_connection(struct nvmet_fc_tgtport *tgtport,
+ struct nvmet_fc_ls_iod *iod)
+{
+ struct fcnvme_ls_cr_conn_rqst *rqst =
+ (struct fcnvme_ls_cr_conn_rqst *)iod->rqstbuf;
+ struct fcnvme_ls_cr_conn_acc *acc =
+ (struct fcnvme_ls_cr_conn_acc *)iod->rspbuf;
+ struct nvmet_fc_tgt_queue *queue;
+ int ret = 0;
+
+ memset(acc, 0, sizeof(*acc));
+
+ if (iod->rqstdatalen < sizeof(struct fcnvme_ls_cr_conn_rqst))
+ ret = VERR_CR_CONN_LEN;
+ else if (rqst->desc_list_len !=
+ fcnvme_lsdesc_len(
+ sizeof(struct fcnvme_ls_cr_conn_rqst)))
+ ret = VERR_CR_CONN_RQST_LEN;
+ else if (rqst->associd.desc_tag != cpu_to_be32(FCNVME_LSDESC_ASSOC_ID))
+ ret = VERR_ASSOC_ID;
+ else if (rqst->associd.desc_len !=
+ fcnvme_lsdesc_len(
+ sizeof(struct fcnvme_lsdesc_assoc_id)))
+ ret = VERR_ASSOC_ID_LEN;
+ else if (rqst->connect_cmd.desc_tag !=
+ cpu_to_be32(FCNVME_LSDESC_CREATE_CONN_CMD))
+ ret = VERR_CR_CONN_CMD;
+ else if (rqst->connect_cmd.desc_len !=
+ fcnvme_lsdesc_len(
+ sizeof(struct fcnvme_lsdesc_cr_conn_cmd)))
+ ret = VERR_CR_CONN_CMD_LEN;
+ else if (!rqst->connect_cmd.ersp_ratio ||
+ (be16_to_cpu(rqst->connect_cmd.ersp_ratio) >=
+ be16_to_cpu(rqst->connect_cmd.sqsize)))
+ ret = VERR_ERSP_RATIO;
+
+ else {
+ /* new io queue */
+ iod->assoc = nvmet_fc_find_target_assoc(tgtport,
+ be64_to_cpu(rqst->associd.association_id));
+ if (!iod->assoc)
+ ret = VERR_NO_ASSOC;
+ else {
+ queue = nvmet_fc_alloc_target_queue(iod->assoc,
+ be16_to_cpu(rqst->connect_cmd.qid),
+ be16_to_cpu(rqst->connect_cmd.sqsize));
+ if (!queue)
+ ret = VERR_QUEUE_ALLOC_FAIL;
+
+ /* release get taken in nvmet_fc_find_target_assoc */
+ nvmet_fc_tgt_a_put(iod->assoc);
+ }
+ }
+
+ if (ret) {
+ dev_err(tgtport->dev,
+ "Create Connection LS failed: %s\n",
+ validation_errors[ret]);
+ iod->lsreq->rsplen = nvmet_fc_format_rjt(acc,
+ NVME_FC_MAX_LS_BUFFER_SIZE, rqst->w0.ls_cmd,
+ (ret == VERR_NO_ASSOC) ?
+ FCNVME_RJT_RC_INV_ASSOC :
+ FCNVME_RJT_RC_LOGIC,
+ FCNVME_RJT_EXP_NONE, 0);
+ return;
+ }
+
+ queue->ersp_ratio = be16_to_cpu(rqst->connect_cmd.ersp_ratio);
+ atomic_set(&queue->connected, 1);
+ queue->sqhd = 0; /* best place to init value */
+
+ /* format a response */
+
+ iod->lsreq->rsplen = sizeof(*acc);
+
+ nvmet_fc_format_rsp_hdr(acc, FCNVME_LS_ACC,
+ fcnvme_lsdesc_len(sizeof(struct fcnvme_ls_cr_conn_acc)),
+ FCNVME_LS_CREATE_CONNECTION);
+ acc->connectid.desc_tag = cpu_to_be32(FCNVME_LSDESC_CONN_ID);
+ acc->connectid.desc_len =
+ fcnvme_lsdesc_len(
+ sizeof(struct fcnvme_lsdesc_conn_id));
+ acc->connectid.connection_id =
+ cpu_to_be64(nvmet_fc_makeconnid(iod->assoc,
+ be16_to_cpu(rqst->connect_cmd.qid)));
+}
+
+static void
+nvmet_fc_ls_disconnect(struct nvmet_fc_tgtport *tgtport,
+ struct nvmet_fc_ls_iod *iod)
+{
+ struct fcnvme_ls_disconnect_rqst *rqst =
+ (struct fcnvme_ls_disconnect_rqst *)iod->rqstbuf;
+ struct fcnvme_ls_disconnect_acc *acc =
+ (struct fcnvme_ls_disconnect_acc *)iod->rspbuf;
+ struct nvmet_fc_tgt_queue *queue = NULL;
+ struct nvmet_fc_tgt_assoc *assoc;
+ int ret = 0;
+ bool del_assoc = false;
+
+ memset(acc, 0, sizeof(*acc));
+
+ if (iod->rqstdatalen < sizeof(struct fcnvme_ls_disconnect_rqst))
+ ret = VERR_DISCONN_LEN;
+ else if (rqst->desc_list_len !=
+ fcnvme_lsdesc_len(
+ sizeof(struct fcnvme_ls_disconnect_rqst)))
+ ret = VERR_DISCONN_RQST_LEN;
+ else if (rqst->associd.desc_tag != cpu_to_be32(FCNVME_LSDESC_ASSOC_ID))
+ ret = VERR_ASSOC_ID;
+ else if (rqst->associd.desc_len !=
+ fcnvme_lsdesc_len(
+ sizeof(struct fcnvme_lsdesc_assoc_id)))
+ ret = VERR_ASSOC_ID_LEN;
+ else if (rqst->discon_cmd.desc_tag !=
+ cpu_to_be32(FCNVME_LSDESC_DISCONN_CMD))
+ ret = VERR_DISCONN_CMD;
+ else if (rqst->discon_cmd.desc_len !=
+ fcnvme_lsdesc_len(
+ sizeof(struct fcnvme_lsdesc_disconn_cmd)))
+ ret = VERR_DISCONN_CMD_LEN;
+ else if ((rqst->discon_cmd.scope != FCNVME_DISCONN_ASSOCIATION) &&
+ (rqst->discon_cmd.scope != FCNVME_DISCONN_CONNECTION))
+ ret = VERR_DISCONN_SCOPE;
+ else {
+ /* match an active association */
+ assoc = nvmet_fc_find_target_assoc(tgtport,
+ be64_to_cpu(rqst->associd.association_id));
+ iod->assoc = assoc;
+ if (assoc) {
+ if (rqst->discon_cmd.scope ==
+ FCNVME_DISCONN_CONNECTION) {
+ queue = nvmet_fc_find_target_queue(tgtport,
+ be64_to_cpu(
+ rqst->discon_cmd.id));
+ if (!queue) {
+ nvmet_fc_tgt_a_put(assoc);
+ ret = VERR_NO_CONN;
+ }
+ }
+ } else
+ ret = VERR_NO_ASSOC;
+ }
+
+ if (ret) {
+ dev_err(tgtport->dev,
+ "Disconnect LS failed: %s\n",
+ validation_errors[ret]);
+ iod->lsreq->rsplen = nvmet_fc_format_rjt(acc,
+ NVME_FC_MAX_LS_BUFFER_SIZE, rqst->w0.ls_cmd,
+ (ret == VERR_NO_ASSOC) ?
+ FCNVME_RJT_RC_INV_ASSOC :
+ (ret == VERR_NO_CONN) ?
+ FCNVME_RJT_RC_INV_CONN :
+ FCNVME_RJT_RC_LOGIC,
+ FCNVME_RJT_EXP_NONE, 0);
+ return;
+ }
+
+ /* format a response */
+
+ iod->lsreq->rsplen = sizeof(*acc);
+
+ nvmet_fc_format_rsp_hdr(acc, FCNVME_LS_ACC,
+ fcnvme_lsdesc_len(
+ sizeof(struct fcnvme_ls_disconnect_acc)),
+ FCNVME_LS_DISCONNECT);
+
+
+ /* are we to delete a Connection ID (queue) */
+ if (queue) {
+ int qid = queue->qid;
+
+ nvmet_fc_delete_target_queue(queue);
+
+ /* release the get taken by find_target_queue */
+ nvmet_fc_tgt_q_put(queue);
+
+ /* tear association down if io queue terminated */
+ if (!qid)
+ del_assoc = true;
+ }
+
+ /* release get taken in nvmet_fc_find_target_assoc */
+ nvmet_fc_tgt_a_put(iod->assoc);
+
+ if (del_assoc)
+ nvmet_fc_delete_target_assoc(iod->assoc);
+}
+
+
+/* *********************** NVME Ctrl Routines **************************** */
+
+
+static void nvmet_fc_fcp_nvme_cmd_done(struct nvmet_req *nvme_req);
+
+static struct nvmet_fabrics_ops nvmet_fc_tgt_fcp_ops;
+
+static void
+nvmet_fc_xmt_ls_rsp_done(struct nvmefc_tgt_ls_req *lsreq)
+{
+ struct nvmet_fc_ls_iod *iod = lsreq->nvmet_fc_private;
+ struct nvmet_fc_tgtport *tgtport = iod->tgtport;
+
+ fc_dma_sync_single_for_cpu(tgtport->dev, iod->rspdma,
+ NVME_FC_MAX_LS_BUFFER_SIZE, DMA_TO_DEVICE);
+ nvmet_fc_free_ls_iod(tgtport, iod);
+ nvmet_fc_tgtport_put(tgtport);
+}
+
+static void
+nvmet_fc_xmt_ls_rsp(struct nvmet_fc_tgtport *tgtport,
+ struct nvmet_fc_ls_iod *iod)
+{
+ int ret;
+
+ fc_dma_sync_single_for_device(tgtport->dev, iod->rspdma,
+ NVME_FC_MAX_LS_BUFFER_SIZE, DMA_TO_DEVICE);
+
+ ret = tgtport->ops->xmt_ls_rsp(&tgtport->fc_target_port, iod->lsreq);
+ if (ret)
+ nvmet_fc_xmt_ls_rsp_done(iod->lsreq);
+}
+
+/*
+ * Actual processing routine for received FC-NVME LS Requests from the LLD
+ */
+static void
+nvmet_fc_handle_ls_rqst(struct nvmet_fc_tgtport *tgtport,
+ struct nvmet_fc_ls_iod *iod)
+{
+ struct fcnvme_ls_rqst_w0 *w0 =
+ (struct fcnvme_ls_rqst_w0 *)iod->rqstbuf;
+
+ iod->lsreq->nvmet_fc_private = iod;
+ iod->lsreq->rspbuf = iod->rspbuf;
+ iod->lsreq->rspdma = iod->rspdma;
+ iod->lsreq->done = nvmet_fc_xmt_ls_rsp_done;
+ /* Be preventative. handlers will later set to valid length */
+ iod->lsreq->rsplen = 0;
+
+ iod->assoc = NULL;
+
+ /*
+ * handlers:
+ * parse request input, execute the request, and format the
+ * LS response
+ */
+ switch (w0->ls_cmd) {
+ case FCNVME_LS_CREATE_ASSOCIATION:
+ /* Creates Association and initial Admin Queue/Connection */
+ nvmet_fc_ls_create_association(tgtport, iod);
+ break;
+ case FCNVME_LS_CREATE_CONNECTION:
+ /* Creates an IO Queue/Connection */
+ nvmet_fc_ls_create_connection(tgtport, iod);
+ break;
+ case FCNVME_LS_DISCONNECT:
+ /* Terminate a Queue/Connection or the Association */
+ nvmet_fc_ls_disconnect(tgtport, iod);
+ break;
+ default:
+ iod->lsreq->rsplen = nvmet_fc_format_rjt(iod->rspbuf,
+ NVME_FC_MAX_LS_BUFFER_SIZE, w0->ls_cmd,
+ FCNVME_RJT_RC_INVAL, FCNVME_RJT_EXP_NONE, 0);
+ }
+
+ nvmet_fc_xmt_ls_rsp(tgtport, iod);
+}
+
+/*
+ * Actual processing routine for received FC-NVME LS Requests from the LLD
+ */
+static void
+nvmet_fc_handle_ls_rqst_work(struct work_struct *work)
+{
+ struct nvmet_fc_ls_iod *iod =
+ container_of(work, struct nvmet_fc_ls_iod, work);
+ struct nvmet_fc_tgtport *tgtport = iod->tgtport;
+
+ nvmet_fc_handle_ls_rqst(tgtport, iod);
+}
+
+
+/**
+ * nvmet_fc_rcv_ls_req - transport entry point called by an LLDD
+ * upon the reception of a NVME LS request.
+ *
+ * The nvmet-fc layer will copy payload to an internal structure for
+ * processing. As such, upon completion of the routine, the LLDD may
+ * immediately free/reuse the LS request buffer passed in the call.
+ *
+ * If this routine returns error, the LLDD should abort the exchange.
+ *
+ * @tgtport: pointer to the (registered) target port the LS was
+ * received on.
+ * @lsreq: pointer to a lsreq request structure to be used to reference
+ * the exchange corresponding to the LS.
+ * @lsreqbuf: pointer to the buffer containing the LS Request
+ * @lsreqbuf_len: length, in bytes, of the received LS request
+ */
+int
+nvmet_fc_rcv_ls_req(struct nvmet_fc_target_port *target_port,
+ struct nvmefc_tgt_ls_req *lsreq,
+ void *lsreqbuf, u32 lsreqbuf_len)
+{
+ struct nvmet_fc_tgtport *tgtport = targetport_to_tgtport(target_port);
+ struct nvmet_fc_ls_iod *iod;
+
+ if (lsreqbuf_len > NVME_FC_MAX_LS_BUFFER_SIZE)
+ return -E2BIG;
+
+ if (!nvmet_fc_tgtport_get(tgtport))
+ return -ESHUTDOWN;
+
+ iod = nvmet_fc_alloc_ls_iod(tgtport);
+ if (!iod) {
+ nvmet_fc_tgtport_put(tgtport);
+ return -ENOENT;
+ }
+
+ iod->lsreq = lsreq;
+ iod->fcpreq = NULL;
+ memcpy(iod->rqstbuf, lsreqbuf, lsreqbuf_len);
+ iod->rqstdatalen = lsreqbuf_len;
+
+ schedule_work(&iod->work);
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(nvmet_fc_rcv_ls_req);
+
+
+/*
+ * **********************
+ * Start of FCP handling
+ * **********************
+ */
+
+static int
+nvmet_fc_alloc_tgt_pgs(struct nvmet_fc_fcp_iod *fod)
+{
+ struct scatterlist *sg;
+ struct page *page;
+ unsigned int nent;
+ u32 page_len, length;
+ int i = 0;
+
+ length = fod->total_length;
+ nent = DIV_ROUND_UP(length, PAGE_SIZE);
+ sg = kmalloc_array(nent, sizeof(struct scatterlist), GFP_KERNEL);
+ if (!sg)
+ goto out;
+
+ sg_init_table(sg, nent);
+
+ while (length) {
+ page_len = min_t(u32, length, PAGE_SIZE);
+
+ page = alloc_page(GFP_KERNEL);
+ if (!page)
+ goto out_free_pages;
+
+ sg_set_page(&sg[i], page, page_len, 0);
+ length -= page_len;
+ i++;
+ }
+
+ fod->data_sg = sg;
+ fod->data_sg_cnt = nent;
+ fod->data_sg_cnt = fc_dma_map_sg(fod->tgtport->dev, sg, nent,
+ ((fod->io_dir == NVMET_FCP_WRITE) ?
+ DMA_FROM_DEVICE : DMA_TO_DEVICE));
+ /* note: write from initiator perspective */
+ fod->next_sg = fod->data_sg;
+
+ return 0;
+
+out_free_pages:
+ while (i > 0) {
+ i--;
+ __free_page(sg_page(&sg[i]));
+ }
+ kfree(sg);
+ fod->data_sg = NULL;
+ fod->data_sg_cnt = 0;
+out:
+ return NVME_SC_INTERNAL;
+}
+
+static void
+nvmet_fc_free_tgt_pgs(struct nvmet_fc_fcp_iod *fod)
+{
+ struct scatterlist *sg;
+ int count;
+
+ if (!fod->data_sg || !fod->data_sg_cnt)
+ return;
+
+ fc_dma_unmap_sg(fod->tgtport->dev, fod->data_sg, fod->data_sg_cnt,
+ ((fod->io_dir == NVMET_FCP_WRITE) ?
+ DMA_FROM_DEVICE : DMA_TO_DEVICE));
+ for_each_sg(fod->data_sg, sg, fod->data_sg_cnt, count)
+ __free_page(sg_page(sg));
+ kfree(fod->data_sg);
+ fod->data_sg = NULL;
+ fod->data_sg_cnt = 0;
+}
+
+
+static bool
+queue_90percent_full(struct nvmet_fc_tgt_queue *q, u32 sqhd)
+{
+ u32 sqtail, used;
+
+ /* egad, this is ugly. And sqtail is just a best guess */
+ sqtail = atomic_read(&q->sqtail) % q->sqsize;
+
+ used = (sqtail < sqhd) ? (sqtail + q->sqsize - sqhd) : (sqtail - sqhd);
+ return ((used * 10) >= (((u32)(q->sqsize - 1) * 9)));
+}
+
+/*
+ * Prep RSP payload.
+ * May be a NVMET_FCOP_RSP or NVMET_FCOP_READDATA_RSP op
+ */
+static void
+nvmet_fc_prep_fcp_rsp(struct nvmet_fc_tgtport *tgtport,
+ struct nvmet_fc_fcp_iod *fod)
+{
+ struct nvme_fc_ersp_iu *ersp = &fod->rspiubuf;
+ struct nvme_common_command *sqe = &fod->cmdiubuf.sqe.common;
+ struct nvme_completion *cqe = &ersp->cqe;
+ u32 *cqewd = (u32 *)cqe;
+ bool send_ersp = false;
+ u32 rsn, rspcnt, xfr_length;
+
+ if (fod->fcpreq->op == NVMET_FCOP_READDATA_RSP)
+ xfr_length = fod->total_length;
+ else
+ xfr_length = fod->offset;
+
+ /*
+ * check to see if we can send a 0's rsp.
+ * Note: to send a 0's response, the NVME-FC host transport will
+ * recreate the CQE. The host transport knows: sq id, SQHD (last
+ * seen in an ersp), and command_id. Thus it will create a
+ * zero-filled CQE with those known fields filled in. Transport
+ * must send an ersp for any condition where the cqe won't match
+ * this.
+ *
+ * Here are the FC-NVME mandated cases where we must send an ersp:
+ * every N responses, where N=ersp_ratio
+ * force fabric commands to send ersp's (not in FC-NVME but good
+ * practice)
+ * normal cmds: any time status is non-zero, or status is zero
+ * but words 0 or 1 are non-zero.
+ * the SQ is 90% or more full
+ * the cmd is a fused command
+ * transferred data length not equal to cmd iu length
+ */
+ rspcnt = atomic_inc_return(&fod->queue->zrspcnt);
+ if (!(rspcnt % fod->queue->ersp_ratio) ||
+ sqe->opcode == nvme_fabrics_command ||
+ xfr_length != fod->total_length ||
+ (le16_to_cpu(cqe->status) & 0xFFFE) || cqewd[0] || cqewd[1] ||
+ (sqe->flags & (NVME_CMD_FUSE_FIRST | NVME_CMD_FUSE_SECOND)) ||
+ queue_90percent_full(fod->queue, le16_to_cpu(cqe->sq_head)))
+ send_ersp = true;
+
+ /* re-set the fields */
+ fod->fcpreq->rspaddr = ersp;
+ fod->fcpreq->rspdma = fod->rspdma;
+
+ if (!send_ersp) {
+ memset(ersp, 0, NVME_FC_SIZEOF_ZEROS_RSP);
+ fod->fcpreq->rsplen = NVME_FC_SIZEOF_ZEROS_RSP;
+ } else {
+ ersp->iu_len = cpu_to_be16(sizeof(*ersp)/sizeof(u32));
+ rsn = atomic_inc_return(&fod->queue->rsn);
+ ersp->rsn = cpu_to_be32(rsn);
+ ersp->xfrd_len = cpu_to_be32(xfr_length);
+ fod->fcpreq->rsplen = sizeof(*ersp);
+ }
+
+ fc_dma_sync_single_for_device(tgtport->dev, fod->rspdma,
+ sizeof(fod->rspiubuf), DMA_TO_DEVICE);
+}
+
+static void nvmet_fc_xmt_fcp_op_done(struct nvmefc_tgt_fcp_req *fcpreq);
+
+static void
+nvmet_fc_abort_op(struct nvmet_fc_tgtport *tgtport,
+ struct nvmet_fc_fcp_iod *fod)
+{
+ struct nvmefc_tgt_fcp_req *fcpreq = fod->fcpreq;
+
+ /* data no longer needed */
+ nvmet_fc_free_tgt_pgs(fod);
+
+ /*
+ * if an ABTS was received or we issued the fcp_abort early
+ * don't call abort routine again.
+ */
+ /* no need to take lock - lock was taken earlier to get here */
+ if (!fod->aborted)
+ tgtport->ops->fcp_abort(&tgtport->fc_target_port, fcpreq);
+
+ nvmet_fc_free_fcp_iod(fod->queue, fod);
+}
+
+static void
+nvmet_fc_xmt_fcp_rsp(struct nvmet_fc_tgtport *tgtport,
+ struct nvmet_fc_fcp_iod *fod)
+{
+ int ret;
+
+ fod->fcpreq->op = NVMET_FCOP_RSP;
+ fod->fcpreq->timeout = 0;
+
+ nvmet_fc_prep_fcp_rsp(tgtport, fod);
+
+ ret = tgtport->ops->fcp_op(&tgtport->fc_target_port, fod->fcpreq);
+ if (ret)
+ nvmet_fc_abort_op(tgtport, fod);
+}
+
+static void
+nvmet_fc_transfer_fcp_data(struct nvmet_fc_tgtport *tgtport,
+ struct nvmet_fc_fcp_iod *fod, u8 op)
+{
+ struct nvmefc_tgt_fcp_req *fcpreq = fod->fcpreq;
+ struct scatterlist *sg = fod->next_sg;
+ unsigned long flags;
+ u32 remaininglen = fod->total_length - fod->offset;
+ u32 tlen = 0;
+ int ret;
+
+ fcpreq->op = op;
+ fcpreq->offset = fod->offset;
+ fcpreq->timeout = NVME_FC_TGTOP_TIMEOUT_SEC;
+
+ /*
+ * for next sequence:
+ * break at a sg element boundary
+ * attempt to keep sequence length capped at
+ * NVMET_FC_MAX_SEQ_LENGTH but allow sequence to
+ * be longer if a single sg element is larger
+ * than that amount. This is done to avoid creating
+ * a new sg list to use for the tgtport api.
+ */
+ fcpreq->sg = sg;
+ fcpreq->sg_cnt = 0;
+ while (tlen < remaininglen &&
+ fcpreq->sg_cnt < tgtport->max_sg_cnt &&
+ tlen + sg_dma_len(sg) < NVMET_FC_MAX_SEQ_LENGTH) {
+ fcpreq->sg_cnt++;
+ tlen += sg_dma_len(sg);
+ sg = sg_next(sg);
+ }
+ if (tlen < remaininglen && fcpreq->sg_cnt == 0) {
+ fcpreq->sg_cnt++;
+ tlen += min_t(u32, sg_dma_len(sg), remaininglen);
+ sg = sg_next(sg);
+ }
+ if (tlen < remaininglen)
+ fod->next_sg = sg;
+ else
+ fod->next_sg = NULL;
+
+ fcpreq->transfer_length = tlen;
+ fcpreq->transferred_length = 0;
+ fcpreq->fcp_error = 0;
+ fcpreq->rsplen = 0;
+
+ /*
+ * If the last READDATA request: check if LLDD supports
+ * combined xfr with response.
+ */
+ if ((op == NVMET_FCOP_READDATA) &&
+ ((fod->offset + fcpreq->transfer_length) == fod->total_length) &&
+ (tgtport->ops->target_features & NVMET_FCTGTFEAT_READDATA_RSP)) {
+ fcpreq->op = NVMET_FCOP_READDATA_RSP;
+ nvmet_fc_prep_fcp_rsp(tgtport, fod);
+ }
+
+ ret = tgtport->ops->fcp_op(&tgtport->fc_target_port, fod->fcpreq);
+ if (ret) {
+ /*
+ * should be ok to set w/o lock as its in the thread of
+ * execution (not an async timer routine) and doesn't
+ * contend with any clearing action
+ */
+ fod->abort = true;
+
+ if (op == NVMET_FCOP_WRITEDATA) {
+ spin_lock_irqsave(&fod->flock, flags);
+ fod->writedataactive = false;
+ spin_unlock_irqrestore(&fod->flock, flags);
+ nvmet_req_complete(&fod->req, NVME_SC_INTERNAL);
+ } else /* NVMET_FCOP_READDATA or NVMET_FCOP_READDATA_RSP */ {
+ fcpreq->fcp_error = ret;
+ fcpreq->transferred_length = 0;
+ nvmet_fc_xmt_fcp_op_done(fod->fcpreq);
+ }
+ }
+}
+
+static inline bool
+__nvmet_fc_fod_op_abort(struct nvmet_fc_fcp_iod *fod, bool abort)
+{
+ struct nvmefc_tgt_fcp_req *fcpreq = fod->fcpreq;
+ struct nvmet_fc_tgtport *tgtport = fod->tgtport;
+
+ /* if in the middle of an io and we need to tear down */
+ if (abort) {
+ if (fcpreq->op == NVMET_FCOP_WRITEDATA) {
+ nvmet_req_complete(&fod->req, NVME_SC_INTERNAL);
+ return true;
+ }
+
+ nvmet_fc_abort_op(tgtport, fod);
+ return true;
+ }
+
+ return false;
+}
+
+/*
+ * actual done handler for FCP operations when completed by the lldd
+ */
+static void
+nvmet_fc_fod_op_done(struct nvmet_fc_fcp_iod *fod)
+{
+ struct nvmefc_tgt_fcp_req *fcpreq = fod->fcpreq;
+ struct nvmet_fc_tgtport *tgtport = fod->tgtport;
+ unsigned long flags;
+ bool abort;
+
+ spin_lock_irqsave(&fod->flock, flags);
+ abort = fod->abort;
+ fod->writedataactive = false;
+ spin_unlock_irqrestore(&fod->flock, flags);
+
+ switch (fcpreq->op) {
+
+ case NVMET_FCOP_WRITEDATA:
+ if (__nvmet_fc_fod_op_abort(fod, abort))
+ return;
+ if (fcpreq->fcp_error ||
+ fcpreq->transferred_length != fcpreq->transfer_length) {
+ spin_lock_irqsave(&fod->flock, flags);
+ fod->abort = true;
+ spin_unlock_irqrestore(&fod->flock, flags);
+
+ nvmet_req_complete(&fod->req, NVME_SC_INTERNAL);
+ return;
+ }
+
+ fod->offset += fcpreq->transferred_length;
+ if (fod->offset != fod->total_length) {
+ spin_lock_irqsave(&fod->flock, flags);
+ fod->writedataactive = true;
+ spin_unlock_irqrestore(&fod->flock, flags);
+
+ /* transfer the next chunk */
+ nvmet_fc_transfer_fcp_data(tgtport, fod,
+ NVMET_FCOP_WRITEDATA);
+ return;
+ }
+
+ /* data transfer complete, resume with nvmet layer */
+
+ fod->req.execute(&fod->req);
+
+ break;
+
+ case NVMET_FCOP_READDATA:
+ case NVMET_FCOP_READDATA_RSP:
+ if (__nvmet_fc_fod_op_abort(fod, abort))
+ return;
+ if (fcpreq->fcp_error ||
+ fcpreq->transferred_length != fcpreq->transfer_length) {
+ nvmet_fc_abort_op(tgtport, fod);
+ return;
+ }
+
+ /* success */
+
+ if (fcpreq->op == NVMET_FCOP_READDATA_RSP) {
+ /* data no longer needed */
+ nvmet_fc_free_tgt_pgs(fod);
+ nvmet_fc_free_fcp_iod(fod->queue, fod);
+ return;
+ }
+
+ fod->offset += fcpreq->transferred_length;
+ if (fod->offset != fod->total_length) {
+ /* transfer the next chunk */
+ nvmet_fc_transfer_fcp_data(tgtport, fod,
+ NVMET_FCOP_READDATA);
+ return;
+ }
+
+ /* data transfer complete, send response */
+
+ /* data no longer needed */
+ nvmet_fc_free_tgt_pgs(fod);
+
+ nvmet_fc_xmt_fcp_rsp(tgtport, fod);
+
+ break;
+
+ case NVMET_FCOP_RSP:
+ if (__nvmet_fc_fod_op_abort(fod, abort))
+ return;
+ nvmet_fc_free_fcp_iod(fod->queue, fod);
+ break;
+
+ default:
+ break;
+ }
+}
+
+static void
+nvmet_fc_fcp_rqst_op_done_work(struct work_struct *work)
+{
+ struct nvmet_fc_fcp_iod *fod =
+ container_of(work, struct nvmet_fc_fcp_iod, done_work);
+
+ nvmet_fc_fod_op_done(fod);
+}
+
+static void
+nvmet_fc_xmt_fcp_op_done(struct nvmefc_tgt_fcp_req *fcpreq)
+{
+ struct nvmet_fc_fcp_iod *fod = fcpreq->nvmet_fc_private;
+ struct nvmet_fc_tgt_queue *queue = fod->queue;
+
+ if (fod->tgtport->ops->target_features & NVMET_FCTGTFEAT_OPDONE_IN_ISR)
+ /* context switch so completion is not in ISR context */
+ queue_work_on(queue->cpu, queue->work_q, &fod->done_work);
+ else
+ nvmet_fc_fod_op_done(fod);
+}
+
+/*
+ * actual completion handler after execution by the nvmet layer
+ */
+static void
+__nvmet_fc_fcp_nvme_cmd_done(struct nvmet_fc_tgtport *tgtport,
+ struct nvmet_fc_fcp_iod *fod, int status)
+{
+ struct nvme_common_command *sqe = &fod->cmdiubuf.sqe.common;
+ struct nvme_completion *cqe = &fod->rspiubuf.cqe;
+ unsigned long flags;
+ bool abort;
+
+ spin_lock_irqsave(&fod->flock, flags);
+ abort = fod->abort;
+ spin_unlock_irqrestore(&fod->flock, flags);
+
+ /* if we have a CQE, snoop the last sq_head value */
+ if (!status)
+ fod->queue->sqhd = cqe->sq_head;
+
+ if (abort) {
+ nvmet_fc_abort_op(tgtport, fod);
+ return;
+ }
+
+ /* if an error handling the cmd post initial parsing */
+ if (status) {
+ /* fudge up a failed CQE status for our transport error */
+ memset(cqe, 0, sizeof(*cqe));
+ cqe->sq_head = fod->queue->sqhd; /* echo last cqe sqhd */
+ cqe->sq_id = cpu_to_le16(fod->queue->qid);
+ cqe->command_id = sqe->command_id;
+ cqe->status = cpu_to_le16(status);
+ } else {
+
+ /*
+ * try to push the data even if the SQE status is non-zero.
+ * There may be a status where data still was intended to
+ * be moved
+ */
+ if ((fod->io_dir == NVMET_FCP_READ) && (fod->data_sg_cnt)) {
+ /* push the data over before sending rsp */
+ nvmet_fc_transfer_fcp_data(tgtport, fod,
+ NVMET_FCOP_READDATA);
+ return;
+ }
+
+ /* writes & no data - fall thru */
+ }
+
+ /* data no longer needed */
+ nvmet_fc_free_tgt_pgs(fod);
+
+ nvmet_fc_xmt_fcp_rsp(tgtport, fod);
+}
+
+
+static void
+nvmet_fc_fcp_nvme_cmd_done(struct nvmet_req *nvme_req)
+{
+ struct nvmet_fc_fcp_iod *fod = nvmet_req_to_fod(nvme_req);
+ struct nvmet_fc_tgtport *tgtport = fod->tgtport;
+
+ __nvmet_fc_fcp_nvme_cmd_done(tgtport, fod, 0);
+}
+
+
+/*
+ * Actual processing routine for received FC-NVME LS Requests from the LLD
+ */
+static void
+nvmet_fc_handle_fcp_rqst(struct nvmet_fc_tgtport *tgtport,
+ struct nvmet_fc_fcp_iod *fod)
+{
+ struct nvme_fc_cmd_iu *cmdiu = &fod->cmdiubuf;
+ int ret;
+
+ /*
+ * Fused commands are currently not supported in the linux
+ * implementation.
+ *
+ * As such, the implementation of the FC transport does not
+ * look at the fused commands and order delivery to the upper
+ * layer until we have both based on csn.
+ */
+
+ fod->fcpreq->done = nvmet_fc_xmt_fcp_op_done;
+
+ fod->total_length = be32_to_cpu(cmdiu->data_len);
+ if (cmdiu->flags & FCNVME_CMD_FLAGS_WRITE) {
+ fod->io_dir = NVMET_FCP_WRITE;
+ if (!nvme_is_write(&cmdiu->sqe))
+ goto transport_error;
+ } else if (cmdiu->flags & FCNVME_CMD_FLAGS_READ) {
+ fod->io_dir = NVMET_FCP_READ;
+ if (nvme_is_write(&cmdiu->sqe))
+ goto transport_error;
+ } else {
+ fod->io_dir = NVMET_FCP_NODATA;
+ if (fod->total_length)
+ goto transport_error;
+ }
+
+ fod->req.cmd = &fod->cmdiubuf.sqe;
+ fod->req.rsp = &fod->rspiubuf.cqe;
+ fod->req.port = fod->queue->port;
+
+ /* ensure nvmet handlers will set cmd handler callback */
+ fod->req.execute = NULL;
+
+ /* clear any response payload */
+ memset(&fod->rspiubuf, 0, sizeof(fod->rspiubuf));
+
+ fod->data_sg = NULL;
+ fod->data_sg_cnt = 0;
+
+ ret = nvmet_req_init(&fod->req,
+ &fod->queue->nvme_cq,
+ &fod->queue->nvme_sq,
+ &nvmet_fc_tgt_fcp_ops);
+ if (!ret) {
+ /* bad SQE content or invalid ctrl state */
+ /* nvmet layer has already called op done to send rsp. */
+ return;
+ }
+
+ /* keep a running counter of tail position */
+ atomic_inc(&fod->queue->sqtail);
+
+ if (fod->total_length) {
+ ret = nvmet_fc_alloc_tgt_pgs(fod);
+ if (ret) {
+ nvmet_req_complete(&fod->req, ret);
+ return;
+ }
+ }
+ fod->req.sg = fod->data_sg;
+ fod->req.sg_cnt = fod->data_sg_cnt;
+ fod->offset = 0;
+
+ if (fod->io_dir == NVMET_FCP_WRITE) {
+ /* pull the data over before invoking nvmet layer */
+ nvmet_fc_transfer_fcp_data(tgtport, fod, NVMET_FCOP_WRITEDATA);
+ return;
+ }
+
+ /*
+ * Reads or no data:
+ *
+ * can invoke the nvmet_layer now. If read data, cmd completion will
+ * push the data
+ */
+
+ fod->req.execute(&fod->req);
+
+ return;
+
+transport_error:
+ nvmet_fc_abort_op(tgtport, fod);
+}
+
+/*
+ * Actual processing routine for received FC-NVME LS Requests from the LLD
+ */
+static void
+nvmet_fc_handle_fcp_rqst_work(struct work_struct *work)
+{
+ struct nvmet_fc_fcp_iod *fod =
+ container_of(work, struct nvmet_fc_fcp_iod, work);
+ struct nvmet_fc_tgtport *tgtport = fod->tgtport;
+
+ nvmet_fc_handle_fcp_rqst(tgtport, fod);
+}
+
+/**
+ * nvmet_fc_rcv_fcp_req - transport entry point called by an LLDD
+ * upon the reception of a NVME FCP CMD IU.
+ *
+ * Pass a FC-NVME FCP CMD IU received from the FC link to the nvmet-fc
+ * layer for processing.
+ *
+ * The nvmet_fc layer allocates a local job structure (struct
+ * nvmet_fc_fcp_iod) from the queue for the io and copies the
+ * CMD IU buffer to the job structure. As such, on a successful
+ * completion (returns 0), the LLDD may immediately free/reuse
+ * the CMD IU buffer passed in the call.
+ *
+ * However, in some circumstances, due to the packetized nature of FC
+ * and the api of the FC LLDD which may issue a hw command to send the
+ * response, but the LLDD may not get the hw completion for that command
+ * and upcall the nvmet_fc layer before a new command may be
+ * asynchronously received - its possible for a command to be received
+ * before the LLDD and nvmet_fc have recycled the job structure. It gives
+ * the appearance of more commands received than fits in the sq.
+ * To alleviate this scenario, a temporary queue is maintained in the
+ * transport for pending LLDD requests waiting for a queue job structure.
+ * In these "overrun" cases, a temporary queue element is allocated
+ * the LLDD request and CMD iu buffer information remembered, and the
+ * routine returns a -EOVERFLOW status. Subsequently, when a queue job
+ * structure is freed, it is immediately reallocated for anything on the
+ * pending request list. The LLDDs defer_rcv() callback is called,
+ * informing the LLDD that it may reuse the CMD IU buffer, and the io
+ * is then started normally with the transport.
+ *
+ * The LLDD, when receiving an -EOVERFLOW completion status, is to treat
+ * the completion as successful but must not reuse the CMD IU buffer
+ * until the LLDD's defer_rcv() callback has been called for the
+ * corresponding struct nvmefc_tgt_fcp_req pointer.
+ *
+ * If there is any other condition in which an error occurs, the
+ * transport will return a non-zero status indicating the error.
+ * In all cases other than -EOVERFLOW, the transport has not accepted the
+ * request and the LLDD should abort the exchange.
+ *
+ * @target_port: pointer to the (registered) target port the FCP CMD IU
+ * was received on.
+ * @fcpreq: pointer to a fcpreq request structure to be used to reference
+ * the exchange corresponding to the FCP Exchange.
+ * @cmdiubuf: pointer to the buffer containing the FCP CMD IU
+ * @cmdiubuf_len: length, in bytes, of the received FCP CMD IU
+ */
+int
+nvmet_fc_rcv_fcp_req(struct nvmet_fc_target_port *target_port,
+ struct nvmefc_tgt_fcp_req *fcpreq,
+ void *cmdiubuf, u32 cmdiubuf_len)
+{
+ struct nvmet_fc_tgtport *tgtport = targetport_to_tgtport(target_port);
+ struct nvme_fc_cmd_iu *cmdiu = cmdiubuf;
+ struct nvmet_fc_tgt_queue *queue;
+ struct nvmet_fc_fcp_iod *fod;
+ struct nvmet_fc_defer_fcp_req *deferfcp;
+ unsigned long flags;
+
+ /* validate iu, so the connection id can be used to find the queue */
+ if ((cmdiubuf_len != sizeof(*cmdiu)) ||
+ (cmdiu->scsi_id != NVME_CMD_SCSI_ID) ||
+ (cmdiu->fc_id != NVME_CMD_FC_ID) ||
+ (be16_to_cpu(cmdiu->iu_len) != (sizeof(*cmdiu)/4)))
+ return -EIO;
+
+ queue = nvmet_fc_find_target_queue(tgtport,
+ be64_to_cpu(cmdiu->connection_id));
+ if (!queue)
+ return -ENOTCONN;
+
+ /*
+ * note: reference taken by find_target_queue
+ * After successful fod allocation, the fod will inherit the
+ * ownership of that reference and will remove the reference
+ * when the fod is freed.
+ */
+
+ spin_lock_irqsave(&queue->qlock, flags);
+
+ fod = nvmet_fc_alloc_fcp_iod(queue);
+ if (fod) {
+ spin_unlock_irqrestore(&queue->qlock, flags);
+
+ fcpreq->nvmet_fc_private = fod;
+ fod->fcpreq = fcpreq;
+
+ memcpy(&fod->cmdiubuf, cmdiubuf, cmdiubuf_len);
+
+ nvmet_fc_queue_fcp_req(tgtport, queue, fcpreq);
+
+ return 0;
+ }
+
+ if (!tgtport->ops->defer_rcv) {
+ spin_unlock_irqrestore(&queue->qlock, flags);
+ /* release the queue lookup reference */
+ nvmet_fc_tgt_q_put(queue);
+ return -ENOENT;
+ }
+
+ deferfcp = list_first_entry_or_null(&queue->avail_defer_list,
+ struct nvmet_fc_defer_fcp_req, req_list);
+ if (deferfcp) {
+ /* Just re-use one that was previously allocated */
+ list_del(&deferfcp->req_list);
+ } else {
+ spin_unlock_irqrestore(&queue->qlock, flags);
+
+ /* Now we need to dynamically allocate one */
+ deferfcp = kmalloc(sizeof(*deferfcp), GFP_KERNEL);
+ if (!deferfcp) {
+ /* release the queue lookup reference */
+ nvmet_fc_tgt_q_put(queue);
+ return -ENOMEM;
+ }
+ spin_lock_irqsave(&queue->qlock, flags);
+ }
+
+ /* For now, use rspaddr / rsplen to save payload information */
+ fcpreq->rspaddr = cmdiubuf;
+ fcpreq->rsplen = cmdiubuf_len;
+ deferfcp->fcp_req = fcpreq;
+
+ /* defer processing till a fod becomes available */
+ list_add_tail(&deferfcp->req_list, &queue->pending_cmd_list);
+
+ /* NOTE: the queue lookup reference is still valid */
+
+ spin_unlock_irqrestore(&queue->qlock, flags);
+
+ return -EOVERFLOW;
+}
+EXPORT_SYMBOL_GPL(nvmet_fc_rcv_fcp_req);
+
+/**
+ * nvmet_fc_rcv_fcp_abort - transport entry point called by an LLDD
+ * upon the reception of an ABTS for a FCP command
+ *
+ * Notify the transport that an ABTS has been received for a FCP command
+ * that had been given to the transport via nvmet_fc_rcv_fcp_req(). The
+ * LLDD believes the command is still being worked on
+ * (template_ops->fcp_req_release() has not been called).
+ *
+ * The transport will wait for any outstanding work (an op to the LLDD,
+ * which the lldd should complete with error due to the ABTS; or the
+ * completion from the nvmet layer of the nvme command), then will
+ * stop processing and call the nvmet_fc_rcv_fcp_req() callback to
+ * return the i/o context to the LLDD. The LLDD may send the BA_ACC
+ * to the ABTS either after return from this function (assuming any
+ * outstanding op work has been terminated) or upon the callback being
+ * called.
+ *
+ * @target_port: pointer to the (registered) target port the FCP CMD IU
+ * was received on.
+ * @fcpreq: pointer to the fcpreq request structure that corresponds
+ * to the exchange that received the ABTS.
+ */
+void
+nvmet_fc_rcv_fcp_abort(struct nvmet_fc_target_port *target_port,
+ struct nvmefc_tgt_fcp_req *fcpreq)
+{
+ struct nvmet_fc_fcp_iod *fod = fcpreq->nvmet_fc_private;
+ struct nvmet_fc_tgt_queue *queue;
+ unsigned long flags;
+
+ if (!fod || fod->fcpreq != fcpreq)
+ /* job appears to have already completed, ignore abort */
+ return;
+
+ queue = fod->queue;
+
+ spin_lock_irqsave(&queue->qlock, flags);
+ if (fod->active) {
+ /*
+ * mark as abort. The abort handler, invoked upon completion
+ * of any work, will detect the aborted status and do the
+ * callback.
+ */
+ spin_lock(&fod->flock);
+ fod->abort = true;
+ fod->aborted = true;
+ spin_unlock(&fod->flock);
+ }
+ spin_unlock_irqrestore(&queue->qlock, flags);
+}
+EXPORT_SYMBOL_GPL(nvmet_fc_rcv_fcp_abort);
+
+
+struct nvmet_fc_traddr {
+ u64 nn;
+ u64 pn;
+};
+
+static int
+__nvme_fc_parse_u64(substring_t *sstr, u64 *val)
+{
+ u64 token64;
+
+ if (match_u64(sstr, &token64))
+ return -EINVAL;
+ *val = token64;
+
+ return 0;
+}
+
+/*
+ * This routine validates and extracts the WWN's from the TRADDR string.
+ * As kernel parsers need the 0x to determine number base, universally
+ * build string to parse with 0x prefix before parsing name strings.
+ */
+static int
+nvme_fc_parse_traddr(struct nvmet_fc_traddr *traddr, char *buf, size_t blen)
+{
+ char name[2 + NVME_FC_TRADDR_HEXNAMELEN + 1];
+ substring_t wwn = { name, &name[sizeof(name)-1] };
+ int nnoffset, pnoffset;
+
+ /* validate it string one of the 2 allowed formats */
+ if (strnlen(buf, blen) == NVME_FC_TRADDR_MAXLENGTH &&
+ !strncmp(buf, "nn-0x", NVME_FC_TRADDR_OXNNLEN) &&
+ !strncmp(&buf[NVME_FC_TRADDR_MAX_PN_OFFSET],
+ "pn-0x", NVME_FC_TRADDR_OXNNLEN)) {
+ nnoffset = NVME_FC_TRADDR_OXNNLEN;
+ pnoffset = NVME_FC_TRADDR_MAX_PN_OFFSET +
+ NVME_FC_TRADDR_OXNNLEN;
+ } else if ((strnlen(buf, blen) == NVME_FC_TRADDR_MINLENGTH &&
+ !strncmp(buf, "nn-", NVME_FC_TRADDR_NNLEN) &&
+ !strncmp(&buf[NVME_FC_TRADDR_MIN_PN_OFFSET],
+ "pn-", NVME_FC_TRADDR_NNLEN))) {
+ nnoffset = NVME_FC_TRADDR_NNLEN;
+ pnoffset = NVME_FC_TRADDR_MIN_PN_OFFSET + NVME_FC_TRADDR_NNLEN;
+ } else
+ goto out_einval;
+
+ name[0] = '0';
+ name[1] = 'x';
+ name[2 + NVME_FC_TRADDR_HEXNAMELEN] = 0;
+
+ memcpy(&name[2], &buf[nnoffset], NVME_FC_TRADDR_HEXNAMELEN);
+ if (__nvme_fc_parse_u64(&wwn, &traddr->nn))
+ goto out_einval;
+
+ memcpy(&name[2], &buf[pnoffset], NVME_FC_TRADDR_HEXNAMELEN);
+ if (__nvme_fc_parse_u64(&wwn, &traddr->pn))
+ goto out_einval;
+
+ return 0;
+
+out_einval:
+ pr_warn("%s: bad traddr string\n", __func__);
+ return -EINVAL;
+}
+
+static int
+nvmet_fc_add_port(struct nvmet_port *port)
+{
+ struct nvmet_fc_tgtport *tgtport;
+ struct nvmet_fc_traddr traddr = { 0L, 0L };
+ unsigned long flags;
+ int ret;
+
+ /* validate the address info */
+ if ((port->disc_addr.trtype != NVMF_TRTYPE_FC) ||
+ (port->disc_addr.adrfam != NVMF_ADDR_FAMILY_FC))
+ return -EINVAL;
+
+ /* map the traddr address info to a target port */
+
+ ret = nvme_fc_parse_traddr(&traddr, port->disc_addr.traddr,
+ sizeof(port->disc_addr.traddr));
+ if (ret)
+ return ret;
+
+ ret = -ENXIO;
+ spin_lock_irqsave(&nvmet_fc_tgtlock, flags);
+ list_for_each_entry(tgtport, &nvmet_fc_target_list, tgt_list) {
+ if ((tgtport->fc_target_port.node_name == traddr.nn) &&
+ (tgtport->fc_target_port.port_name == traddr.pn)) {
+ /* a FC port can only be 1 nvmet port id */
+ if (!tgtport->port) {
+ tgtport->port = port;
+ port->priv = tgtport;
+ nvmet_fc_tgtport_get(tgtport);
+ ret = 0;
+ } else
+ ret = -EALREADY;
+ break;
+ }
+ }
+ spin_unlock_irqrestore(&nvmet_fc_tgtlock, flags);
+ return ret;
+}
+
+static void
+nvmet_fc_remove_port(struct nvmet_port *port)
+{
+ struct nvmet_fc_tgtport *tgtport = port->priv;
+ unsigned long flags;
+ bool matched = false;
+
+ spin_lock_irqsave(&nvmet_fc_tgtlock, flags);
+ if (tgtport->port == port) {
+ matched = true;
+ tgtport->port = NULL;
+ }
+ spin_unlock_irqrestore(&nvmet_fc_tgtlock, flags);
+
+ if (matched)
+ nvmet_fc_tgtport_put(tgtport);
+}
+
+static struct nvmet_fabrics_ops nvmet_fc_tgt_fcp_ops = {
+ .owner = THIS_MODULE,
+ .type = NVMF_TRTYPE_FC,
+ .msdbd = 1,
+ .add_port = nvmet_fc_add_port,
+ .remove_port = nvmet_fc_remove_port,
+ .queue_response = nvmet_fc_fcp_nvme_cmd_done,
+ .delete_ctrl = nvmet_fc_delete_ctrl,
+};
+
+static int __init nvmet_fc_init_module(void)
+{
+ return nvmet_register_transport(&nvmet_fc_tgt_fcp_ops);
+}
+
+static void __exit nvmet_fc_exit_module(void)
+{
+ /* sanity check - all lports should be removed */
+ if (!list_empty(&nvmet_fc_target_list))
+ pr_warn("%s: targetport list not empty\n", __func__);
+
+ nvmet_unregister_transport(&nvmet_fc_tgt_fcp_ops);
+
+ ida_destroy(&nvmet_fc_tgtport_cnt);
+}
+
+module_init(nvmet_fc_init_module);
+module_exit(nvmet_fc_exit_module);
+
+MODULE_LICENSE("GPL v2");
diff --git a/src/kernel/linux/v4.14/drivers/nvme/target/fcloop.c b/src/kernel/linux/v4.14/drivers/nvme/target/fcloop.c
new file mode 100644
index 0000000..096523d
--- /dev/null
+++ b/src/kernel/linux/v4.14/drivers/nvme/target/fcloop.c
@@ -0,0 +1,1258 @@
+/*
+ * Copyright (c) 2016 Avago Technologies. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of version 2 of the GNU General Public License as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful.
+ * ALL EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND WARRANTIES,
+ * INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS FOR A
+ * PARTICULAR PURPOSE, OR NON-INFRINGEMENT, ARE DISCLAIMED, EXCEPT TO
+ * THE EXTENT THAT SUCH DISCLAIMERS ARE HELD TO BE LEGALLY INVALID.
+ * See the GNU General Public License for more details, a copy of which
+ * can be found in the file COPYING included with this package
+ */
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+#include <linux/module.h>
+#include <linux/parser.h>
+#include <uapi/scsi/fc/fc_fs.h>
+
+#include "../host/nvme.h"
+#include "../target/nvmet.h"
+#include <linux/nvme-fc-driver.h>
+#include <linux/nvme-fc.h>
+
+
+enum {
+ NVMF_OPT_ERR = 0,
+ NVMF_OPT_WWNN = 1 << 0,
+ NVMF_OPT_WWPN = 1 << 1,
+ NVMF_OPT_ROLES = 1 << 2,
+ NVMF_OPT_FCADDR = 1 << 3,
+ NVMF_OPT_LPWWNN = 1 << 4,
+ NVMF_OPT_LPWWPN = 1 << 5,
+};
+
+struct fcloop_ctrl_options {
+ int mask;
+ u64 wwnn;
+ u64 wwpn;
+ u32 roles;
+ u32 fcaddr;
+ u64 lpwwnn;
+ u64 lpwwpn;
+};
+
+static const match_table_t opt_tokens = {
+ { NVMF_OPT_WWNN, "wwnn=%s" },
+ { NVMF_OPT_WWPN, "wwpn=%s" },
+ { NVMF_OPT_ROLES, "roles=%d" },
+ { NVMF_OPT_FCADDR, "fcaddr=%x" },
+ { NVMF_OPT_LPWWNN, "lpwwnn=%s" },
+ { NVMF_OPT_LPWWPN, "lpwwpn=%s" },
+ { NVMF_OPT_ERR, NULL }
+};
+
+static int
+fcloop_parse_options(struct fcloop_ctrl_options *opts,
+ const char *buf)
+{
+ substring_t args[MAX_OPT_ARGS];
+ char *options, *o, *p;
+ int token, ret = 0;
+ u64 token64;
+
+ options = o = kstrdup(buf, GFP_KERNEL);
+ if (!options)
+ return -ENOMEM;
+
+ while ((p = strsep(&o, ",\n")) != NULL) {
+ if (!*p)
+ continue;
+
+ token = match_token(p, opt_tokens, args);
+ opts->mask |= token;
+ switch (token) {
+ case NVMF_OPT_WWNN:
+ if (match_u64(args, &token64)) {
+ ret = -EINVAL;
+ goto out_free_options;
+ }
+ opts->wwnn = token64;
+ break;
+ case NVMF_OPT_WWPN:
+ if (match_u64(args, &token64)) {
+ ret = -EINVAL;
+ goto out_free_options;
+ }
+ opts->wwpn = token64;
+ break;
+ case NVMF_OPT_ROLES:
+ if (match_int(args, &token)) {
+ ret = -EINVAL;
+ goto out_free_options;
+ }
+ opts->roles = token;
+ break;
+ case NVMF_OPT_FCADDR:
+ if (match_hex(args, &token)) {
+ ret = -EINVAL;
+ goto out_free_options;
+ }
+ opts->fcaddr = token;
+ break;
+ case NVMF_OPT_LPWWNN:
+ if (match_u64(args, &token64)) {
+ ret = -EINVAL;
+ goto out_free_options;
+ }
+ opts->lpwwnn = token64;
+ break;
+ case NVMF_OPT_LPWWPN:
+ if (match_u64(args, &token64)) {
+ ret = -EINVAL;
+ goto out_free_options;
+ }
+ opts->lpwwpn = token64;
+ break;
+ default:
+ pr_warn("unknown parameter or missing value '%s'\n", p);
+ ret = -EINVAL;
+ goto out_free_options;
+ }
+ }
+
+out_free_options:
+ kfree(options);
+ return ret;
+}
+
+
+static int
+fcloop_parse_nm_options(struct device *dev, u64 *nname, u64 *pname,
+ const char *buf)
+{
+ substring_t args[MAX_OPT_ARGS];
+ char *options, *o, *p;
+ int token, ret = 0;
+ u64 token64;
+
+ *nname = -1;
+ *pname = -1;
+
+ options = o = kstrdup(buf, GFP_KERNEL);
+ if (!options)
+ return -ENOMEM;
+
+ while ((p = strsep(&o, ",\n")) != NULL) {
+ if (!*p)
+ continue;
+
+ token = match_token(p, opt_tokens, args);
+ switch (token) {
+ case NVMF_OPT_WWNN:
+ if (match_u64(args, &token64)) {
+ ret = -EINVAL;
+ goto out_free_options;
+ }
+ *nname = token64;
+ break;
+ case NVMF_OPT_WWPN:
+ if (match_u64(args, &token64)) {
+ ret = -EINVAL;
+ goto out_free_options;
+ }
+ *pname = token64;
+ break;
+ default:
+ pr_warn("unknown parameter or missing value '%s'\n", p);
+ ret = -EINVAL;
+ goto out_free_options;
+ }
+ }
+
+out_free_options:
+ kfree(options);
+
+ if (!ret) {
+ if (*nname == -1)
+ return -EINVAL;
+ if (*pname == -1)
+ return -EINVAL;
+ }
+
+ return ret;
+}
+
+
+#define LPORT_OPTS (NVMF_OPT_WWNN | NVMF_OPT_WWPN)
+
+#define RPORT_OPTS (NVMF_OPT_WWNN | NVMF_OPT_WWPN | \
+ NVMF_OPT_LPWWNN | NVMF_OPT_LPWWPN)
+
+#define TGTPORT_OPTS (NVMF_OPT_WWNN | NVMF_OPT_WWPN)
+
+
+static DEFINE_SPINLOCK(fcloop_lock);
+static LIST_HEAD(fcloop_lports);
+static LIST_HEAD(fcloop_nports);
+
+struct fcloop_lport {
+ struct nvme_fc_local_port *localport;
+ struct list_head lport_list;
+ struct completion unreg_done;
+};
+
+struct fcloop_lport_priv {
+ struct fcloop_lport *lport;
+};
+
+struct fcloop_rport {
+ struct nvme_fc_remote_port *remoteport;
+ struct nvmet_fc_target_port *targetport;
+ struct fcloop_nport *nport;
+ struct fcloop_lport *lport;
+};
+
+struct fcloop_tport {
+ struct nvmet_fc_target_port *targetport;
+ struct nvme_fc_remote_port *remoteport;
+ struct fcloop_nport *nport;
+ struct fcloop_lport *lport;
+};
+
+struct fcloop_nport {
+ struct fcloop_rport *rport;
+ struct fcloop_tport *tport;
+ struct fcloop_lport *lport;
+ struct list_head nport_list;
+ struct kref ref;
+ u64 node_name;
+ u64 port_name;
+ u32 port_role;
+ u32 port_id;
+};
+
+struct fcloop_lsreq {
+ struct fcloop_tport *tport;
+ struct nvmefc_ls_req *lsreq;
+ struct work_struct work;
+ struct nvmefc_tgt_ls_req tgt_ls_req;
+ int status;
+};
+
+struct fcloop_fcpreq {
+ struct fcloop_tport *tport;
+ struct nvmefc_fcp_req *fcpreq;
+ spinlock_t reqlock;
+ u16 status;
+ bool active;
+ bool aborted;
+ struct work_struct work;
+ struct nvmefc_tgt_fcp_req tgt_fcp_req;
+};
+
+struct fcloop_ini_fcpreq {
+ struct nvmefc_fcp_req *fcpreq;
+ struct fcloop_fcpreq *tfcp_req;
+ struct work_struct iniwork;
+};
+
+static inline struct fcloop_lsreq *
+tgt_ls_req_to_lsreq(struct nvmefc_tgt_ls_req *tgt_lsreq)
+{
+ return container_of(tgt_lsreq, struct fcloop_lsreq, tgt_ls_req);
+}
+
+static inline struct fcloop_fcpreq *
+tgt_fcp_req_to_fcpreq(struct nvmefc_tgt_fcp_req *tgt_fcpreq)
+{
+ return container_of(tgt_fcpreq, struct fcloop_fcpreq, tgt_fcp_req);
+}
+
+
+static int
+fcloop_create_queue(struct nvme_fc_local_port *localport,
+ unsigned int qidx, u16 qsize,
+ void **handle)
+{
+ *handle = localport;
+ return 0;
+}
+
+static void
+fcloop_delete_queue(struct nvme_fc_local_port *localport,
+ unsigned int idx, void *handle)
+{
+}
+
+
+/*
+ * Transmit of LS RSP done (e.g. buffers all set). call back up
+ * initiator "done" flows.
+ */
+static void
+fcloop_tgt_lsrqst_done_work(struct work_struct *work)
+{
+ struct fcloop_lsreq *tls_req =
+ container_of(work, struct fcloop_lsreq, work);
+ struct fcloop_tport *tport = tls_req->tport;
+ struct nvmefc_ls_req *lsreq = tls_req->lsreq;
+
+ if (!tport || tport->remoteport)
+ lsreq->done(lsreq, tls_req->status);
+}
+
+static int
+fcloop_ls_req(struct nvme_fc_local_port *localport,
+ struct nvme_fc_remote_port *remoteport,
+ struct nvmefc_ls_req *lsreq)
+{
+ struct fcloop_lsreq *tls_req = lsreq->private;
+ struct fcloop_rport *rport = remoteport->private;
+ int ret = 0;
+
+ tls_req->lsreq = lsreq;
+ INIT_WORK(&tls_req->work, fcloop_tgt_lsrqst_done_work);
+
+ if (!rport->targetport) {
+ tls_req->status = -ECONNREFUSED;
+ tls_req->tport = NULL;
+ schedule_work(&tls_req->work);
+ return ret;
+ }
+
+ tls_req->status = 0;
+ tls_req->tport = rport->targetport->private;
+ ret = nvmet_fc_rcv_ls_req(rport->targetport, &tls_req->tgt_ls_req,
+ lsreq->rqstaddr, lsreq->rqstlen);
+
+ return ret;
+}
+
+static int
+fcloop_xmt_ls_rsp(struct nvmet_fc_target_port *tport,
+ struct nvmefc_tgt_ls_req *tgt_lsreq)
+{
+ struct fcloop_lsreq *tls_req = tgt_ls_req_to_lsreq(tgt_lsreq);
+ struct nvmefc_ls_req *lsreq = tls_req->lsreq;
+
+ memcpy(lsreq->rspaddr, tgt_lsreq->rspbuf,
+ ((lsreq->rsplen < tgt_lsreq->rsplen) ?
+ lsreq->rsplen : tgt_lsreq->rsplen));
+ tgt_lsreq->done(tgt_lsreq);
+
+ schedule_work(&tls_req->work);
+
+ return 0;
+}
+
+/*
+ * FCP IO operation done by initiator abort.
+ * call back up initiator "done" flows.
+ */
+static void
+fcloop_tgt_fcprqst_ini_done_work(struct work_struct *work)
+{
+ struct fcloop_ini_fcpreq *inireq =
+ container_of(work, struct fcloop_ini_fcpreq, iniwork);
+
+ inireq->fcpreq->done(inireq->fcpreq);
+}
+
+/*
+ * FCP IO operation done by target completion.
+ * call back up initiator "done" flows.
+ */
+static void
+fcloop_tgt_fcprqst_done_work(struct work_struct *work)
+{
+ struct fcloop_fcpreq *tfcp_req =
+ container_of(work, struct fcloop_fcpreq, work);
+ struct fcloop_tport *tport = tfcp_req->tport;
+ struct nvmefc_fcp_req *fcpreq;
+
+ spin_lock(&tfcp_req->reqlock);
+ fcpreq = tfcp_req->fcpreq;
+ tfcp_req->fcpreq = NULL;
+ spin_unlock(&tfcp_req->reqlock);
+
+ if (tport->remoteport && fcpreq) {
+ fcpreq->status = tfcp_req->status;
+ fcpreq->done(fcpreq);
+ }
+
+ kfree(tfcp_req);
+}
+
+
+static int
+fcloop_fcp_req(struct nvme_fc_local_port *localport,
+ struct nvme_fc_remote_port *remoteport,
+ void *hw_queue_handle,
+ struct nvmefc_fcp_req *fcpreq)
+{
+ struct fcloop_rport *rport = remoteport->private;
+ struct fcloop_ini_fcpreq *inireq = fcpreq->private;
+ struct fcloop_fcpreq *tfcp_req;
+ int ret = 0;
+
+ if (!rport->targetport)
+ return -ECONNREFUSED;
+
+ tfcp_req = kzalloc(sizeof(*tfcp_req), GFP_KERNEL);
+ if (!tfcp_req)
+ return -ENOMEM;
+
+ inireq->fcpreq = fcpreq;
+ inireq->tfcp_req = tfcp_req;
+ INIT_WORK(&inireq->iniwork, fcloop_tgt_fcprqst_ini_done_work);
+ tfcp_req->fcpreq = fcpreq;
+ tfcp_req->tport = rport->targetport->private;
+ spin_lock_init(&tfcp_req->reqlock);
+ INIT_WORK(&tfcp_req->work, fcloop_tgt_fcprqst_done_work);
+
+ ret = nvmet_fc_rcv_fcp_req(rport->targetport, &tfcp_req->tgt_fcp_req,
+ fcpreq->cmdaddr, fcpreq->cmdlen);
+
+ return ret;
+}
+
+static void
+fcloop_fcp_copy_data(u8 op, struct scatterlist *data_sg,
+ struct scatterlist *io_sg, u32 offset, u32 length)
+{
+ void *data_p, *io_p;
+ u32 data_len, io_len, tlen;
+
+ io_p = sg_virt(io_sg);
+ io_len = io_sg->length;
+
+ for ( ; offset; ) {
+ tlen = min_t(u32, offset, io_len);
+ offset -= tlen;
+ io_len -= tlen;
+ if (!io_len) {
+ io_sg = sg_next(io_sg);
+ io_p = sg_virt(io_sg);
+ io_len = io_sg->length;
+ } else
+ io_p += tlen;
+ }
+
+ data_p = sg_virt(data_sg);
+ data_len = data_sg->length;
+
+ for ( ; length; ) {
+ tlen = min_t(u32, io_len, data_len);
+ tlen = min_t(u32, tlen, length);
+
+ if (op == NVMET_FCOP_WRITEDATA)
+ memcpy(data_p, io_p, tlen);
+ else
+ memcpy(io_p, data_p, tlen);
+
+ length -= tlen;
+
+ io_len -= tlen;
+ if ((!io_len) && (length)) {
+ io_sg = sg_next(io_sg);
+ io_p = sg_virt(io_sg);
+ io_len = io_sg->length;
+ } else
+ io_p += tlen;
+
+ data_len -= tlen;
+ if ((!data_len) && (length)) {
+ data_sg = sg_next(data_sg);
+ data_p = sg_virt(data_sg);
+ data_len = data_sg->length;
+ } else
+ data_p += tlen;
+ }
+}
+
+static int
+fcloop_fcp_op(struct nvmet_fc_target_port *tgtport,
+ struct nvmefc_tgt_fcp_req *tgt_fcpreq)
+{
+ struct fcloop_fcpreq *tfcp_req = tgt_fcp_req_to_fcpreq(tgt_fcpreq);
+ struct nvmefc_fcp_req *fcpreq;
+ u32 rsplen = 0, xfrlen = 0;
+ int fcp_err = 0, active, aborted;
+ u8 op = tgt_fcpreq->op;
+
+ spin_lock(&tfcp_req->reqlock);
+ fcpreq = tfcp_req->fcpreq;
+ active = tfcp_req->active;
+ aborted = tfcp_req->aborted;
+ tfcp_req->active = true;
+ spin_unlock(&tfcp_req->reqlock);
+
+ if (unlikely(active))
+ /* illegal - call while i/o active */
+ return -EALREADY;
+
+ if (unlikely(aborted)) {
+ /* target transport has aborted i/o prior */
+ spin_lock(&tfcp_req->reqlock);
+ tfcp_req->active = false;
+ spin_unlock(&tfcp_req->reqlock);
+ tgt_fcpreq->transferred_length = 0;
+ tgt_fcpreq->fcp_error = -ECANCELED;
+ tgt_fcpreq->done(tgt_fcpreq);
+ return 0;
+ }
+
+ /*
+ * if fcpreq is NULL, the I/O has been aborted (from
+ * initiator side). For the target side, act as if all is well
+ * but don't actually move data.
+ */
+
+ switch (op) {
+ case NVMET_FCOP_WRITEDATA:
+ xfrlen = tgt_fcpreq->transfer_length;
+ if (fcpreq) {
+ fcloop_fcp_copy_data(op, tgt_fcpreq->sg,
+ fcpreq->first_sgl, tgt_fcpreq->offset,
+ xfrlen);
+ fcpreq->transferred_length += xfrlen;
+ }
+ break;
+
+ case NVMET_FCOP_READDATA:
+ case NVMET_FCOP_READDATA_RSP:
+ xfrlen = tgt_fcpreq->transfer_length;
+ if (fcpreq) {
+ fcloop_fcp_copy_data(op, tgt_fcpreq->sg,
+ fcpreq->first_sgl, tgt_fcpreq->offset,
+ xfrlen);
+ fcpreq->transferred_length += xfrlen;
+ }
+ if (op == NVMET_FCOP_READDATA)
+ break;
+
+ /* Fall-Thru to RSP handling */
+ /* FALLTHRU */
+
+ case NVMET_FCOP_RSP:
+ if (fcpreq) {
+ rsplen = ((fcpreq->rsplen < tgt_fcpreq->rsplen) ?
+ fcpreq->rsplen : tgt_fcpreq->rsplen);
+ memcpy(fcpreq->rspaddr, tgt_fcpreq->rspaddr, rsplen);
+ if (rsplen < tgt_fcpreq->rsplen)
+ fcp_err = -E2BIG;
+ fcpreq->rcv_rsplen = rsplen;
+ fcpreq->status = 0;
+ }
+ tfcp_req->status = 0;
+ break;
+
+ default:
+ fcp_err = -EINVAL;
+ break;
+ }
+
+ spin_lock(&tfcp_req->reqlock);
+ tfcp_req->active = false;
+ spin_unlock(&tfcp_req->reqlock);
+
+ tgt_fcpreq->transferred_length = xfrlen;
+ tgt_fcpreq->fcp_error = fcp_err;
+ tgt_fcpreq->done(tgt_fcpreq);
+
+ return 0;
+}
+
+static void
+fcloop_tgt_fcp_abort(struct nvmet_fc_target_port *tgtport,
+ struct nvmefc_tgt_fcp_req *tgt_fcpreq)
+{
+ struct fcloop_fcpreq *tfcp_req = tgt_fcp_req_to_fcpreq(tgt_fcpreq);
+
+ /*
+ * mark aborted only in case there were 2 threads in transport
+ * (one doing io, other doing abort) and only kills ops posted
+ * after the abort request
+ */
+ spin_lock(&tfcp_req->reqlock);
+ tfcp_req->aborted = true;
+ spin_unlock(&tfcp_req->reqlock);
+
+ tfcp_req->status = NVME_SC_INTERNAL;
+
+ /*
+ * nothing more to do. If io wasn't active, the transport should
+ * immediately call the req_release. If it was active, the op
+ * will complete, and the lldd should call req_release.
+ */
+}
+
+static void
+fcloop_fcp_req_release(struct nvmet_fc_target_port *tgtport,
+ struct nvmefc_tgt_fcp_req *tgt_fcpreq)
+{
+ struct fcloop_fcpreq *tfcp_req = tgt_fcp_req_to_fcpreq(tgt_fcpreq);
+
+ schedule_work(&tfcp_req->work);
+}
+
+static void
+fcloop_ls_abort(struct nvme_fc_local_port *localport,
+ struct nvme_fc_remote_port *remoteport,
+ struct nvmefc_ls_req *lsreq)
+{
+}
+
+static void
+fcloop_fcp_abort(struct nvme_fc_local_port *localport,
+ struct nvme_fc_remote_port *remoteport,
+ void *hw_queue_handle,
+ struct nvmefc_fcp_req *fcpreq)
+{
+ struct fcloop_rport *rport = remoteport->private;
+ struct fcloop_ini_fcpreq *inireq = fcpreq->private;
+ struct fcloop_fcpreq *tfcp_req = inireq->tfcp_req;
+
+ if (!tfcp_req)
+ /* abort has already been called */
+ goto finish;
+
+ /* break initiator/target relationship for io */
+ spin_lock(&tfcp_req->reqlock);
+ inireq->tfcp_req = NULL;
+ tfcp_req->fcpreq = NULL;
+ spin_unlock(&tfcp_req->reqlock);
+
+ if (rport->targetport)
+ nvmet_fc_rcv_fcp_abort(rport->targetport,
+ &tfcp_req->tgt_fcp_req);
+
+finish:
+ /* post the aborted io completion */
+ fcpreq->status = -ECANCELED;
+ schedule_work(&inireq->iniwork);
+}
+
+static void
+fcloop_nport_free(struct kref *ref)
+{
+ struct fcloop_nport *nport =
+ container_of(ref, struct fcloop_nport, ref);
+ unsigned long flags;
+
+ spin_lock_irqsave(&fcloop_lock, flags);
+ list_del(&nport->nport_list);
+ spin_unlock_irqrestore(&fcloop_lock, flags);
+
+ kfree(nport);
+}
+
+static void
+fcloop_nport_put(struct fcloop_nport *nport)
+{
+ kref_put(&nport->ref, fcloop_nport_free);
+}
+
+static int
+fcloop_nport_get(struct fcloop_nport *nport)
+{
+ return kref_get_unless_zero(&nport->ref);
+}
+
+static void
+fcloop_localport_delete(struct nvme_fc_local_port *localport)
+{
+ struct fcloop_lport_priv *lport_priv = localport->private;
+ struct fcloop_lport *lport = lport_priv->lport;
+
+ /* release any threads waiting for the unreg to complete */
+ complete(&lport->unreg_done);
+}
+
+static void
+fcloop_remoteport_delete(struct nvme_fc_remote_port *remoteport)
+{
+ struct fcloop_rport *rport = remoteport->private;
+
+ fcloop_nport_put(rport->nport);
+}
+
+static void
+fcloop_targetport_delete(struct nvmet_fc_target_port *targetport)
+{
+ struct fcloop_tport *tport = targetport->private;
+
+ fcloop_nport_put(tport->nport);
+}
+
+#define FCLOOP_HW_QUEUES 4
+#define FCLOOP_SGL_SEGS 256
+#define FCLOOP_DMABOUND_4G 0xFFFFFFFF
+
+static struct nvme_fc_port_template fctemplate = {
+ .localport_delete = fcloop_localport_delete,
+ .remoteport_delete = fcloop_remoteport_delete,
+ .create_queue = fcloop_create_queue,
+ .delete_queue = fcloop_delete_queue,
+ .ls_req = fcloop_ls_req,
+ .fcp_io = fcloop_fcp_req,
+ .ls_abort = fcloop_ls_abort,
+ .fcp_abort = fcloop_fcp_abort,
+ .max_hw_queues = FCLOOP_HW_QUEUES,
+ .max_sgl_segments = FCLOOP_SGL_SEGS,
+ .max_dif_sgl_segments = FCLOOP_SGL_SEGS,
+ .dma_boundary = FCLOOP_DMABOUND_4G,
+ /* sizes of additional private data for data structures */
+ .local_priv_sz = sizeof(struct fcloop_lport_priv),
+ .remote_priv_sz = sizeof(struct fcloop_rport),
+ .lsrqst_priv_sz = sizeof(struct fcloop_lsreq),
+ .fcprqst_priv_sz = sizeof(struct fcloop_ini_fcpreq),
+};
+
+static struct nvmet_fc_target_template tgttemplate = {
+ .targetport_delete = fcloop_targetport_delete,
+ .xmt_ls_rsp = fcloop_xmt_ls_rsp,
+ .fcp_op = fcloop_fcp_op,
+ .fcp_abort = fcloop_tgt_fcp_abort,
+ .fcp_req_release = fcloop_fcp_req_release,
+ .max_hw_queues = FCLOOP_HW_QUEUES,
+ .max_sgl_segments = FCLOOP_SGL_SEGS,
+ .max_dif_sgl_segments = FCLOOP_SGL_SEGS,
+ .dma_boundary = FCLOOP_DMABOUND_4G,
+ /* optional features */
+ .target_features = NVMET_FCTGTFEAT_CMD_IN_ISR |
+ NVMET_FCTGTFEAT_OPDONE_IN_ISR,
+ /* sizes of additional private data for data structures */
+ .target_priv_sz = sizeof(struct fcloop_tport),
+};
+
+static ssize_t
+fcloop_create_local_port(struct device *dev, struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ struct nvme_fc_port_info pinfo;
+ struct fcloop_ctrl_options *opts;
+ struct nvme_fc_local_port *localport;
+ struct fcloop_lport *lport;
+ struct fcloop_lport_priv *lport_priv;
+ unsigned long flags;
+ int ret = -ENOMEM;
+
+ lport = kzalloc(sizeof(*lport), GFP_KERNEL);
+ if (!lport)
+ return -ENOMEM;
+
+ opts = kzalloc(sizeof(*opts), GFP_KERNEL);
+ if (!opts)
+ goto out_free_lport;
+
+ ret = fcloop_parse_options(opts, buf);
+ if (ret)
+ goto out_free_opts;
+
+ /* everything there ? */
+ if ((opts->mask & LPORT_OPTS) != LPORT_OPTS) {
+ ret = -EINVAL;
+ goto out_free_opts;
+ }
+
+ memset(&pinfo, 0, sizeof(pinfo));
+ pinfo.node_name = opts->wwnn;
+ pinfo.port_name = opts->wwpn;
+ pinfo.port_role = opts->roles;
+ pinfo.port_id = opts->fcaddr;
+
+ ret = nvme_fc_register_localport(&pinfo, &fctemplate, NULL, &localport);
+ if (!ret) {
+ /* success */
+ lport_priv = localport->private;
+ lport_priv->lport = lport;
+
+ lport->localport = localport;
+ INIT_LIST_HEAD(&lport->lport_list);
+
+ spin_lock_irqsave(&fcloop_lock, flags);
+ list_add_tail(&lport->lport_list, &fcloop_lports);
+ spin_unlock_irqrestore(&fcloop_lock, flags);
+ }
+
+out_free_opts:
+ kfree(opts);
+out_free_lport:
+ /* free only if we're going to fail */
+ if (ret)
+ kfree(lport);
+
+ return ret ? ret : count;
+}
+
+
+static void
+__unlink_local_port(struct fcloop_lport *lport)
+{
+ list_del(&lport->lport_list);
+}
+
+static int
+__wait_localport_unreg(struct fcloop_lport *lport)
+{
+ int ret;
+
+ init_completion(&lport->unreg_done);
+
+ ret = nvme_fc_unregister_localport(lport->localport);
+
+ wait_for_completion(&lport->unreg_done);
+
+ kfree(lport);
+
+ return ret;
+}
+
+
+static ssize_t
+fcloop_delete_local_port(struct device *dev, struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ struct fcloop_lport *tlport, *lport = NULL;
+ u64 nodename, portname;
+ unsigned long flags;
+ int ret;
+
+ ret = fcloop_parse_nm_options(dev, &nodename, &portname, buf);
+ if (ret)
+ return ret;
+
+ spin_lock_irqsave(&fcloop_lock, flags);
+
+ list_for_each_entry(tlport, &fcloop_lports, lport_list) {
+ if (tlport->localport->node_name == nodename &&
+ tlport->localport->port_name == portname) {
+ lport = tlport;
+ __unlink_local_port(lport);
+ break;
+ }
+ }
+ spin_unlock_irqrestore(&fcloop_lock, flags);
+
+ if (!lport)
+ return -ENOENT;
+
+ ret = __wait_localport_unreg(lport);
+
+ return ret ? ret : count;
+}
+
+static struct fcloop_nport *
+fcloop_alloc_nport(const char *buf, size_t count, bool remoteport)
+{
+ struct fcloop_nport *newnport, *nport = NULL;
+ struct fcloop_lport *tmplport, *lport = NULL;
+ struct fcloop_ctrl_options *opts;
+ unsigned long flags;
+ u32 opts_mask = (remoteport) ? RPORT_OPTS : TGTPORT_OPTS;
+ int ret;
+
+ opts = kzalloc(sizeof(*opts), GFP_KERNEL);
+ if (!opts)
+ return NULL;
+
+ ret = fcloop_parse_options(opts, buf);
+ if (ret)
+ goto out_free_opts;
+
+ /* everything there ? */
+ if ((opts->mask & opts_mask) != opts_mask) {
+ ret = -EINVAL;
+ goto out_free_opts;
+ }
+
+ newnport = kzalloc(sizeof(*newnport), GFP_KERNEL);
+ if (!newnport)
+ goto out_free_opts;
+
+ INIT_LIST_HEAD(&newnport->nport_list);
+ newnport->node_name = opts->wwnn;
+ newnport->port_name = opts->wwpn;
+ if (opts->mask & NVMF_OPT_ROLES)
+ newnport->port_role = opts->roles;
+ if (opts->mask & NVMF_OPT_FCADDR)
+ newnport->port_id = opts->fcaddr;
+ kref_init(&newnport->ref);
+
+ spin_lock_irqsave(&fcloop_lock, flags);
+
+ list_for_each_entry(tmplport, &fcloop_lports, lport_list) {
+ if (tmplport->localport->node_name == opts->wwnn &&
+ tmplport->localport->port_name == opts->wwpn)
+ goto out_invalid_opts;
+
+ if (tmplport->localport->node_name == opts->lpwwnn &&
+ tmplport->localport->port_name == opts->lpwwpn)
+ lport = tmplport;
+ }
+
+ if (remoteport) {
+ if (!lport)
+ goto out_invalid_opts;
+ newnport->lport = lport;
+ }
+
+ list_for_each_entry(nport, &fcloop_nports, nport_list) {
+ if (nport->node_name == opts->wwnn &&
+ nport->port_name == opts->wwpn) {
+ if ((remoteport && nport->rport) ||
+ (!remoteport && nport->tport)) {
+ nport = NULL;
+ goto out_invalid_opts;
+ }
+
+ fcloop_nport_get(nport);
+
+ spin_unlock_irqrestore(&fcloop_lock, flags);
+
+ if (remoteport)
+ nport->lport = lport;
+ if (opts->mask & NVMF_OPT_ROLES)
+ nport->port_role = opts->roles;
+ if (opts->mask & NVMF_OPT_FCADDR)
+ nport->port_id = opts->fcaddr;
+ goto out_free_newnport;
+ }
+ }
+
+ list_add_tail(&newnport->nport_list, &fcloop_nports);
+
+ spin_unlock_irqrestore(&fcloop_lock, flags);
+
+ kfree(opts);
+ return newnport;
+
+out_invalid_opts:
+ spin_unlock_irqrestore(&fcloop_lock, flags);
+out_free_newnport:
+ kfree(newnport);
+out_free_opts:
+ kfree(opts);
+ return nport;
+}
+
+static ssize_t
+fcloop_create_remote_port(struct device *dev, struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ struct nvme_fc_remote_port *remoteport;
+ struct fcloop_nport *nport;
+ struct fcloop_rport *rport;
+ struct nvme_fc_port_info pinfo;
+ int ret;
+
+ nport = fcloop_alloc_nport(buf, count, true);
+ if (!nport)
+ return -EIO;
+
+ memset(&pinfo, 0, sizeof(pinfo));
+ pinfo.node_name = nport->node_name;
+ pinfo.port_name = nport->port_name;
+ pinfo.port_role = nport->port_role;
+ pinfo.port_id = nport->port_id;
+
+ ret = nvme_fc_register_remoteport(nport->lport->localport,
+ &pinfo, &remoteport);
+ if (ret || !remoteport) {
+ fcloop_nport_put(nport);
+ return ret;
+ }
+
+ /* success */
+ rport = remoteport->private;
+ rport->remoteport = remoteport;
+ rport->targetport = (nport->tport) ? nport->tport->targetport : NULL;
+ if (nport->tport) {
+ nport->tport->remoteport = remoteport;
+ nport->tport->lport = nport->lport;
+ }
+ rport->nport = nport;
+ rport->lport = nport->lport;
+ nport->rport = rport;
+
+ return count;
+}
+
+
+static struct fcloop_rport *
+__unlink_remote_port(struct fcloop_nport *nport)
+{
+ struct fcloop_rport *rport = nport->rport;
+
+ if (rport && nport->tport)
+ nport->tport->remoteport = NULL;
+ nport->rport = NULL;
+
+ return rport;
+}
+
+static int
+__remoteport_unreg(struct fcloop_nport *nport, struct fcloop_rport *rport)
+{
+ if (!rport)
+ return -EALREADY;
+
+ return nvme_fc_unregister_remoteport(rport->remoteport);
+}
+
+static ssize_t
+fcloop_delete_remote_port(struct device *dev, struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ struct fcloop_nport *nport = NULL, *tmpport;
+ static struct fcloop_rport *rport;
+ u64 nodename, portname;
+ unsigned long flags;
+ int ret;
+
+ ret = fcloop_parse_nm_options(dev, &nodename, &portname, buf);
+ if (ret)
+ return ret;
+
+ spin_lock_irqsave(&fcloop_lock, flags);
+
+ list_for_each_entry(tmpport, &fcloop_nports, nport_list) {
+ if (tmpport->node_name == nodename &&
+ tmpport->port_name == portname && tmpport->rport) {
+ nport = tmpport;
+ rport = __unlink_remote_port(nport);
+ break;
+ }
+ }
+
+ spin_unlock_irqrestore(&fcloop_lock, flags);
+
+ if (!nport)
+ return -ENOENT;
+
+ ret = __remoteport_unreg(nport, rport);
+
+ return ret ? ret : count;
+}
+
+static ssize_t
+fcloop_create_target_port(struct device *dev, struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ struct nvmet_fc_target_port *targetport;
+ struct fcloop_nport *nport;
+ struct fcloop_tport *tport;
+ struct nvmet_fc_port_info tinfo;
+ int ret;
+
+ nport = fcloop_alloc_nport(buf, count, false);
+ if (!nport)
+ return -EIO;
+
+ tinfo.node_name = nport->node_name;
+ tinfo.port_name = nport->port_name;
+ tinfo.port_id = nport->port_id;
+
+ ret = nvmet_fc_register_targetport(&tinfo, &tgttemplate, NULL,
+ &targetport);
+ if (ret) {
+ fcloop_nport_put(nport);
+ return ret;
+ }
+
+ /* success */
+ tport = targetport->private;
+ tport->targetport = targetport;
+ tport->remoteport = (nport->rport) ? nport->rport->remoteport : NULL;
+ if (nport->rport)
+ nport->rport->targetport = targetport;
+ tport->nport = nport;
+ tport->lport = nport->lport;
+ nport->tport = tport;
+
+ return count;
+}
+
+
+static struct fcloop_tport *
+__unlink_target_port(struct fcloop_nport *nport)
+{
+ struct fcloop_tport *tport = nport->tport;
+
+ if (tport && nport->rport)
+ nport->rport->targetport = NULL;
+ nport->tport = NULL;
+
+ return tport;
+}
+
+static int
+__targetport_unreg(struct fcloop_nport *nport, struct fcloop_tport *tport)
+{
+ if (!tport)
+ return -EALREADY;
+
+ return nvmet_fc_unregister_targetport(tport->targetport);
+}
+
+static ssize_t
+fcloop_delete_target_port(struct device *dev, struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ struct fcloop_nport *nport = NULL, *tmpport;
+ struct fcloop_tport *tport;
+ u64 nodename, portname;
+ unsigned long flags;
+ int ret;
+
+ ret = fcloop_parse_nm_options(dev, &nodename, &portname, buf);
+ if (ret)
+ return ret;
+
+ spin_lock_irqsave(&fcloop_lock, flags);
+
+ list_for_each_entry(tmpport, &fcloop_nports, nport_list) {
+ if (tmpport->node_name == nodename &&
+ tmpport->port_name == portname && tmpport->tport) {
+ nport = tmpport;
+ tport = __unlink_target_port(nport);
+ break;
+ }
+ }
+
+ spin_unlock_irqrestore(&fcloop_lock, flags);
+
+ if (!nport)
+ return -ENOENT;
+
+ ret = __targetport_unreg(nport, tport);
+
+ return ret ? ret : count;
+}
+
+
+static DEVICE_ATTR(add_local_port, 0200, NULL, fcloop_create_local_port);
+static DEVICE_ATTR(del_local_port, 0200, NULL, fcloop_delete_local_port);
+static DEVICE_ATTR(add_remote_port, 0200, NULL, fcloop_create_remote_port);
+static DEVICE_ATTR(del_remote_port, 0200, NULL, fcloop_delete_remote_port);
+static DEVICE_ATTR(add_target_port, 0200, NULL, fcloop_create_target_port);
+static DEVICE_ATTR(del_target_port, 0200, NULL, fcloop_delete_target_port);
+
+static struct attribute *fcloop_dev_attrs[] = {
+ &dev_attr_add_local_port.attr,
+ &dev_attr_del_local_port.attr,
+ &dev_attr_add_remote_port.attr,
+ &dev_attr_del_remote_port.attr,
+ &dev_attr_add_target_port.attr,
+ &dev_attr_del_target_port.attr,
+ NULL
+};
+
+static struct attribute_group fclopp_dev_attrs_group = {
+ .attrs = fcloop_dev_attrs,
+};
+
+static const struct attribute_group *fcloop_dev_attr_groups[] = {
+ &fclopp_dev_attrs_group,
+ NULL,
+};
+
+static struct class *fcloop_class;
+static struct device *fcloop_device;
+
+
+static int __init fcloop_init(void)
+{
+ int ret;
+
+ fcloop_class = class_create(THIS_MODULE, "fcloop");
+ if (IS_ERR(fcloop_class)) {
+ pr_err("couldn't register class fcloop\n");
+ ret = PTR_ERR(fcloop_class);
+ return ret;
+ }
+
+ fcloop_device = device_create_with_groups(
+ fcloop_class, NULL, MKDEV(0, 0), NULL,
+ fcloop_dev_attr_groups, "ctl");
+ if (IS_ERR(fcloop_device)) {
+ pr_err("couldn't create ctl device!\n");
+ ret = PTR_ERR(fcloop_device);
+ goto out_destroy_class;
+ }
+
+ get_device(fcloop_device);
+
+ return 0;
+
+out_destroy_class:
+ class_destroy(fcloop_class);
+ return ret;
+}
+
+static void __exit fcloop_exit(void)
+{
+ struct fcloop_lport *lport;
+ struct fcloop_nport *nport;
+ struct fcloop_tport *tport;
+ struct fcloop_rport *rport;
+ unsigned long flags;
+ int ret;
+
+ spin_lock_irqsave(&fcloop_lock, flags);
+
+ for (;;) {
+ nport = list_first_entry_or_null(&fcloop_nports,
+ typeof(*nport), nport_list);
+ if (!nport)
+ break;
+
+ tport = __unlink_target_port(nport);
+ rport = __unlink_remote_port(nport);
+
+ spin_unlock_irqrestore(&fcloop_lock, flags);
+
+ ret = __targetport_unreg(nport, tport);
+ if (ret)
+ pr_warn("%s: Failed deleting target port\n", __func__);
+
+ ret = __remoteport_unreg(nport, rport);
+ if (ret)
+ pr_warn("%s: Failed deleting remote port\n", __func__);
+
+ spin_lock_irqsave(&fcloop_lock, flags);
+ }
+
+ for (;;) {
+ lport = list_first_entry_or_null(&fcloop_lports,
+ typeof(*lport), lport_list);
+ if (!lport)
+ break;
+
+ __unlink_local_port(lport);
+
+ spin_unlock_irqrestore(&fcloop_lock, flags);
+
+ ret = __wait_localport_unreg(lport);
+ if (ret)
+ pr_warn("%s: Failed deleting local port\n", __func__);
+
+ spin_lock_irqsave(&fcloop_lock, flags);
+ }
+
+ spin_unlock_irqrestore(&fcloop_lock, flags);
+
+ put_device(fcloop_device);
+
+ device_destroy(fcloop_class, MKDEV(0, 0));
+ class_destroy(fcloop_class);
+}
+
+module_init(fcloop_init);
+module_exit(fcloop_exit);
+
+MODULE_LICENSE("GPL v2");
diff --git a/src/kernel/linux/v4.14/drivers/nvme/target/io-cmd.c b/src/kernel/linux/v4.14/drivers/nvme/target/io-cmd.c
new file mode 100644
index 0000000..0d4c23d
--- /dev/null
+++ b/src/kernel/linux/v4.14/drivers/nvme/target/io-cmd.c
@@ -0,0 +1,237 @@
+/*
+ * NVMe I/O command implementation.
+ * Copyright (c) 2015-2016 HGST, a Western Digital Company.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ */
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+#include <linux/blkdev.h>
+#include <linux/module.h>
+#include "nvmet.h"
+
+static void nvmet_bio_done(struct bio *bio)
+{
+ struct nvmet_req *req = bio->bi_private;
+
+ nvmet_req_complete(req,
+ bio->bi_status ? NVME_SC_INTERNAL | NVME_SC_DNR : 0);
+
+ if (bio != &req->inline_bio)
+ bio_put(bio);
+}
+
+static inline u32 nvmet_rw_len(struct nvmet_req *req)
+{
+ return ((u32)le16_to_cpu(req->cmd->rw.length) + 1) <<
+ req->ns->blksize_shift;
+}
+
+static void nvmet_inline_bio_init(struct nvmet_req *req)
+{
+ struct bio *bio = &req->inline_bio;
+
+ bio_init(bio, req->inline_bvec, NVMET_MAX_INLINE_BIOVEC);
+}
+
+static void nvmet_execute_rw(struct nvmet_req *req)
+{
+ int sg_cnt = req->sg_cnt;
+ struct scatterlist *sg;
+ struct bio *bio;
+ sector_t sector;
+ blk_qc_t cookie;
+ int op, op_flags = 0, i;
+
+ if (!req->sg_cnt) {
+ nvmet_req_complete(req, 0);
+ return;
+ }
+
+ if (req->cmd->rw.opcode == nvme_cmd_write) {
+ op = REQ_OP_WRITE;
+ op_flags = REQ_SYNC | REQ_IDLE;
+ if (req->cmd->rw.control & cpu_to_le16(NVME_RW_FUA))
+ op_flags |= REQ_FUA;
+ } else {
+ op = REQ_OP_READ;
+ }
+
+ sector = le64_to_cpu(req->cmd->rw.slba);
+ sector <<= (req->ns->blksize_shift - 9);
+
+ nvmet_inline_bio_init(req);
+ bio = &req->inline_bio;
+ bio_set_dev(bio, req->ns->bdev);
+ bio->bi_iter.bi_sector = sector;
+ bio->bi_private = req;
+ bio->bi_end_io = nvmet_bio_done;
+ bio_set_op_attrs(bio, op, op_flags);
+
+ for_each_sg(req->sg, sg, req->sg_cnt, i) {
+ while (bio_add_page(bio, sg_page(sg), sg->length, sg->offset)
+ != sg->length) {
+ struct bio *prev = bio;
+
+ bio = bio_alloc(GFP_KERNEL, min(sg_cnt, BIO_MAX_PAGES));
+ bio_set_dev(bio, req->ns->bdev);
+ bio->bi_iter.bi_sector = sector;
+ bio_set_op_attrs(bio, op, op_flags);
+
+ bio_chain(bio, prev);
+ submit_bio(prev);
+ }
+
+ sector += sg->length >> 9;
+ sg_cnt--;
+ }
+
+ cookie = submit_bio(bio);
+
+ blk_mq_poll(bdev_get_queue(req->ns->bdev), cookie);
+}
+
+static void nvmet_execute_flush(struct nvmet_req *req)
+{
+ struct bio *bio;
+
+ nvmet_inline_bio_init(req);
+ bio = &req->inline_bio;
+
+ bio_set_dev(bio, req->ns->bdev);
+ bio->bi_private = req;
+ bio->bi_end_io = nvmet_bio_done;
+ bio->bi_opf = REQ_OP_WRITE | REQ_PREFLUSH;
+
+ submit_bio(bio);
+}
+
+static u16 nvmet_discard_range(struct nvmet_ns *ns,
+ struct nvme_dsm_range *range, struct bio **bio)
+{
+ if (__blkdev_issue_discard(ns->bdev,
+ le64_to_cpu(range->slba) << (ns->blksize_shift - 9),
+ le32_to_cpu(range->nlb) << (ns->blksize_shift - 9),
+ GFP_KERNEL, 0, bio))
+ return NVME_SC_INTERNAL | NVME_SC_DNR;
+ return 0;
+}
+
+static void nvmet_execute_discard(struct nvmet_req *req)
+{
+ struct nvme_dsm_range range;
+ struct bio *bio = NULL;
+ int i;
+ u16 status;
+
+ for (i = 0; i <= le32_to_cpu(req->cmd->dsm.nr); i++) {
+ status = nvmet_copy_from_sgl(req, i * sizeof(range), &range,
+ sizeof(range));
+ if (status)
+ break;
+
+ status = nvmet_discard_range(req->ns, &range, &bio);
+ if (status)
+ break;
+ }
+
+ if (bio) {
+ bio->bi_private = req;
+ bio->bi_end_io = nvmet_bio_done;
+ if (status) {
+ bio->bi_status = BLK_STS_IOERR;
+ bio_endio(bio);
+ } else {
+ submit_bio(bio);
+ }
+ } else {
+ nvmet_req_complete(req, status);
+ }
+}
+
+static void nvmet_execute_dsm(struct nvmet_req *req)
+{
+ switch (le32_to_cpu(req->cmd->dsm.attributes)) {
+ case NVME_DSMGMT_AD:
+ nvmet_execute_discard(req);
+ return;
+ case NVME_DSMGMT_IDR:
+ case NVME_DSMGMT_IDW:
+ default:
+ /* Not supported yet */
+ nvmet_req_complete(req, 0);
+ return;
+ }
+}
+
+static void nvmet_execute_write_zeroes(struct nvmet_req *req)
+{
+ struct nvme_write_zeroes_cmd *write_zeroes = &req->cmd->write_zeroes;
+ struct bio *bio = NULL;
+ u16 status = NVME_SC_SUCCESS;
+ sector_t sector;
+ sector_t nr_sector;
+
+ sector = le64_to_cpu(write_zeroes->slba) <<
+ (req->ns->blksize_shift - 9);
+ nr_sector = (((sector_t)le16_to_cpu(write_zeroes->length)) <<
+ (req->ns->blksize_shift - 9)) + 1;
+
+ if (__blkdev_issue_zeroout(req->ns->bdev, sector, nr_sector,
+ GFP_KERNEL, &bio, 0))
+ status = NVME_SC_INTERNAL | NVME_SC_DNR;
+
+ if (bio) {
+ bio->bi_private = req;
+ bio->bi_end_io = nvmet_bio_done;
+ submit_bio(bio);
+ } else {
+ nvmet_req_complete(req, status);
+ }
+}
+
+u16 nvmet_parse_io_cmd(struct nvmet_req *req)
+{
+ struct nvme_command *cmd = req->cmd;
+ u16 ret;
+
+ ret = nvmet_check_ctrl_status(req, cmd);
+ if (unlikely(ret)) {
+ req->ns = NULL;
+ return ret;
+ }
+
+ req->ns = nvmet_find_namespace(req->sq->ctrl, cmd->rw.nsid);
+ if (unlikely(!req->ns))
+ return NVME_SC_INVALID_NS | NVME_SC_DNR;
+
+ switch (cmd->common.opcode) {
+ case nvme_cmd_read:
+ case nvme_cmd_write:
+ req->execute = nvmet_execute_rw;
+ req->data_len = nvmet_rw_len(req);
+ return 0;
+ case nvme_cmd_flush:
+ req->execute = nvmet_execute_flush;
+ req->data_len = 0;
+ return 0;
+ case nvme_cmd_dsm:
+ req->execute = nvmet_execute_dsm;
+ req->data_len = (le32_to_cpu(cmd->dsm.nr) + 1) *
+ sizeof(struct nvme_dsm_range);
+ return 0;
+ case nvme_cmd_write_zeroes:
+ req->execute = nvmet_execute_write_zeroes;
+ return 0;
+ default:
+ pr_err("unhandled cmd %d on qid %d\n", cmd->common.opcode,
+ req->sq->qid);
+ return NVME_SC_INVALID_OPCODE | NVME_SC_DNR;
+ }
+}
diff --git a/src/kernel/linux/v4.14/drivers/nvme/target/loop.c b/src/kernel/linux/v4.14/drivers/nvme/target/loop.c
new file mode 100644
index 0000000..3388d27
--- /dev/null
+++ b/src/kernel/linux/v4.14/drivers/nvme/target/loop.c
@@ -0,0 +1,761 @@
+/*
+ * NVMe over Fabrics loopback device.
+ * Copyright (c) 2015-2016 HGST, a Western Digital Company.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ */
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+#include <linux/scatterlist.h>
+#include <linux/blk-mq.h>
+#include <linux/nvme.h>
+#include <linux/module.h>
+#include <linux/parser.h>
+#include "nvmet.h"
+#include "../host/nvme.h"
+#include "../host/fabrics.h"
+
+#define NVME_LOOP_MAX_SEGMENTS 256
+
+/*
+ * We handle AEN commands ourselves and don't even let the
+ * block layer know about them.
+ */
+#define NVME_LOOP_NR_AEN_COMMANDS 1
+#define NVME_LOOP_AQ_BLKMQ_DEPTH \
+ (NVME_AQ_DEPTH - NVME_LOOP_NR_AEN_COMMANDS)
+
+struct nvme_loop_iod {
+ struct nvme_request nvme_req;
+ struct nvme_command cmd;
+ struct nvme_completion rsp;
+ struct nvmet_req req;
+ struct nvme_loop_queue *queue;
+ struct work_struct work;
+ struct sg_table sg_table;
+ struct scatterlist first_sgl[];
+};
+
+struct nvme_loop_ctrl {
+ struct nvme_loop_queue *queues;
+
+ struct blk_mq_tag_set admin_tag_set;
+
+ struct list_head list;
+ struct blk_mq_tag_set tag_set;
+ struct nvme_loop_iod async_event_iod;
+ struct nvme_ctrl ctrl;
+
+ struct nvmet_ctrl *target_ctrl;
+ struct work_struct delete_work;
+};
+
+static inline struct nvme_loop_ctrl *to_loop_ctrl(struct nvme_ctrl *ctrl)
+{
+ return container_of(ctrl, struct nvme_loop_ctrl, ctrl);
+}
+
+enum nvme_loop_queue_flags {
+ NVME_LOOP_Q_LIVE = 0,
+};
+
+struct nvme_loop_queue {
+ struct nvmet_cq nvme_cq;
+ struct nvmet_sq nvme_sq;
+ struct nvme_loop_ctrl *ctrl;
+ unsigned long flags;
+};
+
+static struct nvmet_port *nvmet_loop_port;
+
+static LIST_HEAD(nvme_loop_ctrl_list);
+static DEFINE_MUTEX(nvme_loop_ctrl_mutex);
+
+static void nvme_loop_queue_response(struct nvmet_req *nvme_req);
+static void nvme_loop_delete_ctrl(struct nvmet_ctrl *ctrl);
+
+static struct nvmet_fabrics_ops nvme_loop_ops;
+
+static inline int nvme_loop_queue_idx(struct nvme_loop_queue *queue)
+{
+ return queue - queue->ctrl->queues;
+}
+
+static void nvme_loop_complete_rq(struct request *req)
+{
+ struct nvme_loop_iod *iod = blk_mq_rq_to_pdu(req);
+
+ nvme_cleanup_cmd(req);
+ sg_free_table_chained(&iod->sg_table, true);
+ nvme_complete_rq(req);
+}
+
+static struct blk_mq_tags *nvme_loop_tagset(struct nvme_loop_queue *queue)
+{
+ u32 queue_idx = nvme_loop_queue_idx(queue);
+
+ if (queue_idx == 0)
+ return queue->ctrl->admin_tag_set.tags[queue_idx];
+ return queue->ctrl->tag_set.tags[queue_idx - 1];
+}
+
+static void nvme_loop_queue_response(struct nvmet_req *req)
+{
+ struct nvme_loop_queue *queue =
+ container_of(req->sq, struct nvme_loop_queue, nvme_sq);
+ struct nvme_completion *cqe = req->rsp;
+
+ /*
+ * AEN requests are special as they don't time out and can
+ * survive any kind of queue freeze and often don't respond to
+ * aborts. We don't even bother to allocate a struct request
+ * for them but rather special case them here.
+ */
+ if (unlikely(nvme_loop_queue_idx(queue) == 0 &&
+ cqe->command_id >= NVME_LOOP_AQ_BLKMQ_DEPTH)) {
+ nvme_complete_async_event(&queue->ctrl->ctrl, cqe->status,
+ &cqe->result);
+ } else {
+ struct request *rq;
+
+ rq = blk_mq_tag_to_rq(nvme_loop_tagset(queue), cqe->command_id);
+ if (!rq) {
+ dev_err(queue->ctrl->ctrl.device,
+ "tag 0x%x on queue %d not found\n",
+ cqe->command_id, nvme_loop_queue_idx(queue));
+ return;
+ }
+
+ nvme_end_request(rq, cqe->status, cqe->result);
+ }
+}
+
+static void nvme_loop_execute_work(struct work_struct *work)
+{
+ struct nvme_loop_iod *iod =
+ container_of(work, struct nvme_loop_iod, work);
+
+ iod->req.execute(&iod->req);
+}
+
+static enum blk_eh_timer_return
+nvme_loop_timeout(struct request *rq, bool reserved)
+{
+ struct nvme_loop_iod *iod = blk_mq_rq_to_pdu(rq);
+
+ /* queue error recovery */
+ nvme_reset_ctrl(&iod->queue->ctrl->ctrl);
+
+ /* fail with DNR on admin cmd timeout */
+ nvme_req(rq)->status = NVME_SC_ABORT_REQ | NVME_SC_DNR;
+
+ return BLK_EH_HANDLED;
+}
+
+static inline blk_status_t nvme_loop_is_ready(struct nvme_loop_queue *queue,
+ struct request *rq)
+{
+ if (unlikely(!test_bit(NVME_LOOP_Q_LIVE, &queue->flags)))
+ return nvmf_check_init_req(&queue->ctrl->ctrl, rq);
+ return BLK_STS_OK;
+}
+
+static blk_status_t nvme_loop_queue_rq(struct blk_mq_hw_ctx *hctx,
+ const struct blk_mq_queue_data *bd)
+{
+ struct nvme_ns *ns = hctx->queue->queuedata;
+ struct nvme_loop_queue *queue = hctx->driver_data;
+ struct request *req = bd->rq;
+ struct nvme_loop_iod *iod = blk_mq_rq_to_pdu(req);
+ blk_status_t ret;
+
+ ret = nvme_loop_is_ready(queue, req);
+ if (unlikely(ret))
+ return ret;
+
+ ret = nvme_setup_cmd(ns, req, &iod->cmd);
+ if (ret)
+ return ret;
+
+ blk_mq_start_request(req);
+ iod->cmd.common.flags |= NVME_CMD_SGL_METABUF;
+ iod->req.port = nvmet_loop_port;
+ if (!nvmet_req_init(&iod->req, &queue->nvme_cq,
+ &queue->nvme_sq, &nvme_loop_ops))
+ return BLK_STS_OK;
+
+ if (blk_rq_bytes(req)) {
+ iod->sg_table.sgl = iod->first_sgl;
+ if (sg_alloc_table_chained(&iod->sg_table,
+ blk_rq_nr_phys_segments(req),
+ iod->sg_table.sgl))
+ return BLK_STS_RESOURCE;
+
+ iod->req.sg = iod->sg_table.sgl;
+ iod->req.sg_cnt = blk_rq_map_sg(req->q, req, iod->sg_table.sgl);
+ }
+
+ schedule_work(&iod->work);
+ return BLK_STS_OK;
+}
+
+static void nvme_loop_submit_async_event(struct nvme_ctrl *arg, int aer_idx)
+{
+ struct nvme_loop_ctrl *ctrl = to_loop_ctrl(arg);
+ struct nvme_loop_queue *queue = &ctrl->queues[0];
+ struct nvme_loop_iod *iod = &ctrl->async_event_iod;
+
+ memset(&iod->cmd, 0, sizeof(iod->cmd));
+ iod->cmd.common.opcode = nvme_admin_async_event;
+ iod->cmd.common.command_id = NVME_LOOP_AQ_BLKMQ_DEPTH;
+ iod->cmd.common.flags |= NVME_CMD_SGL_METABUF;
+
+ if (!nvmet_req_init(&iod->req, &queue->nvme_cq, &queue->nvme_sq,
+ &nvme_loop_ops)) {
+ dev_err(ctrl->ctrl.device, "failed async event work\n");
+ return;
+ }
+
+ schedule_work(&iod->work);
+}
+
+static int nvme_loop_init_iod(struct nvme_loop_ctrl *ctrl,
+ struct nvme_loop_iod *iod, unsigned int queue_idx)
+{
+ iod->req.cmd = &iod->cmd;
+ iod->req.rsp = &iod->rsp;
+ iod->queue = &ctrl->queues[queue_idx];
+ INIT_WORK(&iod->work, nvme_loop_execute_work);
+ return 0;
+}
+
+static int nvme_loop_init_request(struct blk_mq_tag_set *set,
+ struct request *req, unsigned int hctx_idx,
+ unsigned int numa_node)
+{
+ struct nvme_loop_ctrl *ctrl = set->driver_data;
+
+ return nvme_loop_init_iod(ctrl, blk_mq_rq_to_pdu(req),
+ (set == &ctrl->tag_set) ? hctx_idx + 1 : 0);
+}
+
+static int nvme_loop_init_hctx(struct blk_mq_hw_ctx *hctx, void *data,
+ unsigned int hctx_idx)
+{
+ struct nvme_loop_ctrl *ctrl = data;
+ struct nvme_loop_queue *queue = &ctrl->queues[hctx_idx + 1];
+
+ BUG_ON(hctx_idx >= ctrl->ctrl.queue_count);
+
+ hctx->driver_data = queue;
+ return 0;
+}
+
+static int nvme_loop_init_admin_hctx(struct blk_mq_hw_ctx *hctx, void *data,
+ unsigned int hctx_idx)
+{
+ struct nvme_loop_ctrl *ctrl = data;
+ struct nvme_loop_queue *queue = &ctrl->queues[0];
+
+ BUG_ON(hctx_idx != 0);
+
+ hctx->driver_data = queue;
+ return 0;
+}
+
+static const struct blk_mq_ops nvme_loop_mq_ops = {
+ .queue_rq = nvme_loop_queue_rq,
+ .complete = nvme_loop_complete_rq,
+ .init_request = nvme_loop_init_request,
+ .init_hctx = nvme_loop_init_hctx,
+ .timeout = nvme_loop_timeout,
+};
+
+static const struct blk_mq_ops nvme_loop_admin_mq_ops = {
+ .queue_rq = nvme_loop_queue_rq,
+ .complete = nvme_loop_complete_rq,
+ .init_request = nvme_loop_init_request,
+ .init_hctx = nvme_loop_init_admin_hctx,
+ .timeout = nvme_loop_timeout,
+};
+
+static void nvme_loop_destroy_admin_queue(struct nvme_loop_ctrl *ctrl)
+{
+ clear_bit(NVME_LOOP_Q_LIVE, &ctrl->queues[0].flags);
+ nvmet_sq_destroy(&ctrl->queues[0].nvme_sq);
+ blk_cleanup_queue(ctrl->ctrl.admin_q);
+ blk_mq_free_tag_set(&ctrl->admin_tag_set);
+}
+
+static void nvme_loop_free_ctrl(struct nvme_ctrl *nctrl)
+{
+ struct nvme_loop_ctrl *ctrl = to_loop_ctrl(nctrl);
+
+ if (list_empty(&ctrl->list))
+ goto free_ctrl;
+
+ mutex_lock(&nvme_loop_ctrl_mutex);
+ list_del(&ctrl->list);
+ mutex_unlock(&nvme_loop_ctrl_mutex);
+
+ if (nctrl->tagset) {
+ blk_cleanup_queue(ctrl->ctrl.connect_q);
+ blk_mq_free_tag_set(&ctrl->tag_set);
+ }
+ kfree(ctrl->queues);
+ nvmf_free_options(nctrl->opts);
+free_ctrl:
+ kfree(ctrl);
+}
+
+static void nvme_loop_destroy_io_queues(struct nvme_loop_ctrl *ctrl)
+{
+ int i;
+
+ for (i = 1; i < ctrl->ctrl.queue_count; i++) {
+ clear_bit(NVME_LOOP_Q_LIVE, &ctrl->queues[i].flags);
+ nvmet_sq_destroy(&ctrl->queues[i].nvme_sq);
+ }
+}
+
+static int nvme_loop_init_io_queues(struct nvme_loop_ctrl *ctrl)
+{
+ struct nvmf_ctrl_options *opts = ctrl->ctrl.opts;
+ unsigned int nr_io_queues;
+ int ret, i;
+
+ nr_io_queues = min(opts->nr_io_queues, num_online_cpus());
+ ret = nvme_set_queue_count(&ctrl->ctrl, &nr_io_queues);
+ if (ret || !nr_io_queues)
+ return ret;
+
+ dev_info(ctrl->ctrl.device, "creating %d I/O queues.\n", nr_io_queues);
+
+ for (i = 1; i <= nr_io_queues; i++) {
+ ctrl->queues[i].ctrl = ctrl;
+ ret = nvmet_sq_init(&ctrl->queues[i].nvme_sq);
+ if (ret)
+ goto out_destroy_queues;
+
+ ctrl->ctrl.queue_count++;
+ }
+
+ return 0;
+
+out_destroy_queues:
+ nvme_loop_destroy_io_queues(ctrl);
+ return ret;
+}
+
+static int nvme_loop_connect_io_queues(struct nvme_loop_ctrl *ctrl)
+{
+ int i, ret;
+
+ for (i = 1; i < ctrl->ctrl.queue_count; i++) {
+ ret = nvmf_connect_io_queue(&ctrl->ctrl, i);
+ if (ret)
+ return ret;
+ set_bit(NVME_LOOP_Q_LIVE, &ctrl->queues[i].flags);
+ }
+
+ return 0;
+}
+
+static int nvme_loop_configure_admin_queue(struct nvme_loop_ctrl *ctrl)
+{
+ int error;
+
+ memset(&ctrl->admin_tag_set, 0, sizeof(ctrl->admin_tag_set));
+ ctrl->admin_tag_set.ops = &nvme_loop_admin_mq_ops;
+ ctrl->admin_tag_set.queue_depth = NVME_LOOP_AQ_BLKMQ_DEPTH;
+ ctrl->admin_tag_set.reserved_tags = 2; /* connect + keep-alive */
+ ctrl->admin_tag_set.numa_node = NUMA_NO_NODE;
+ ctrl->admin_tag_set.cmd_size = sizeof(struct nvme_loop_iod) +
+ SG_CHUNK_SIZE * sizeof(struct scatterlist);
+ ctrl->admin_tag_set.driver_data = ctrl;
+ ctrl->admin_tag_set.nr_hw_queues = 1;
+ ctrl->admin_tag_set.timeout = ADMIN_TIMEOUT;
+
+ ctrl->queues[0].ctrl = ctrl;
+ error = nvmet_sq_init(&ctrl->queues[0].nvme_sq);
+ if (error)
+ return error;
+ ctrl->ctrl.queue_count = 1;
+
+ error = blk_mq_alloc_tag_set(&ctrl->admin_tag_set);
+ if (error)
+ goto out_free_sq;
+ ctrl->ctrl.admin_tagset = &ctrl->admin_tag_set;
+
+ ctrl->ctrl.admin_q = blk_mq_init_queue(&ctrl->admin_tag_set);
+ if (IS_ERR(ctrl->ctrl.admin_q)) {
+ error = PTR_ERR(ctrl->ctrl.admin_q);
+ goto out_free_tagset;
+ }
+
+ error = nvmf_connect_admin_queue(&ctrl->ctrl);
+ if (error)
+ goto out_cleanup_queue;
+
+ set_bit(NVME_LOOP_Q_LIVE, &ctrl->queues[0].flags);
+
+ error = nvmf_reg_read64(&ctrl->ctrl, NVME_REG_CAP, &ctrl->ctrl.cap);
+ if (error) {
+ dev_err(ctrl->ctrl.device,
+ "prop_get NVME_REG_CAP failed\n");
+ goto out_cleanup_queue;
+ }
+
+ ctrl->ctrl.sqsize =
+ min_t(int, NVME_CAP_MQES(ctrl->ctrl.cap), ctrl->ctrl.sqsize);
+
+ error = nvme_enable_ctrl(&ctrl->ctrl, ctrl->ctrl.cap);
+ if (error)
+ goto out_cleanup_queue;
+
+ ctrl->ctrl.max_hw_sectors =
+ (NVME_LOOP_MAX_SEGMENTS - 1) << (PAGE_SHIFT - 9);
+
+ error = nvme_init_identify(&ctrl->ctrl);
+ if (error)
+ goto out_cleanup_queue;
+
+ return 0;
+
+out_cleanup_queue:
+ blk_cleanup_queue(ctrl->ctrl.admin_q);
+out_free_tagset:
+ blk_mq_free_tag_set(&ctrl->admin_tag_set);
+out_free_sq:
+ nvmet_sq_destroy(&ctrl->queues[0].nvme_sq);
+ return error;
+}
+
+static void nvme_loop_shutdown_ctrl(struct nvme_loop_ctrl *ctrl)
+{
+ if (ctrl->ctrl.queue_count > 1) {
+ nvme_stop_queues(&ctrl->ctrl);
+ blk_mq_tagset_busy_iter(&ctrl->tag_set,
+ nvme_cancel_request, &ctrl->ctrl);
+ nvme_loop_destroy_io_queues(ctrl);
+ }
+
+ if (ctrl->ctrl.state == NVME_CTRL_LIVE)
+ nvme_shutdown_ctrl(&ctrl->ctrl);
+
+ blk_mq_quiesce_queue(ctrl->ctrl.admin_q);
+ blk_mq_tagset_busy_iter(&ctrl->admin_tag_set,
+ nvme_cancel_request, &ctrl->ctrl);
+ blk_mq_unquiesce_queue(ctrl->ctrl.admin_q);
+ nvme_loop_destroy_admin_queue(ctrl);
+}
+
+static void nvme_loop_del_ctrl_work(struct work_struct *work)
+{
+ struct nvme_loop_ctrl *ctrl = container_of(work,
+ struct nvme_loop_ctrl, delete_work);
+
+ nvme_stop_ctrl(&ctrl->ctrl);
+ nvme_remove_namespaces(&ctrl->ctrl);
+ nvme_loop_shutdown_ctrl(ctrl);
+ nvme_uninit_ctrl(&ctrl->ctrl);
+ nvme_put_ctrl(&ctrl->ctrl);
+}
+
+static int __nvme_loop_del_ctrl(struct nvme_loop_ctrl *ctrl)
+{
+ if (!nvme_change_ctrl_state(&ctrl->ctrl, NVME_CTRL_DELETING))
+ return -EBUSY;
+
+ if (!queue_work(nvme_wq, &ctrl->delete_work))
+ return -EBUSY;
+
+ return 0;
+}
+
+static int nvme_loop_del_ctrl(struct nvme_ctrl *nctrl)
+{
+ struct nvme_loop_ctrl *ctrl = to_loop_ctrl(nctrl);
+ int ret;
+
+ ret = __nvme_loop_del_ctrl(ctrl);
+ if (ret)
+ return ret;
+
+ flush_work(&ctrl->delete_work);
+
+ return 0;
+}
+
+static void nvme_loop_delete_ctrl(struct nvmet_ctrl *nctrl)
+{
+ struct nvme_loop_ctrl *ctrl;
+
+ mutex_lock(&nvme_loop_ctrl_mutex);
+ list_for_each_entry(ctrl, &nvme_loop_ctrl_list, list) {
+ if (ctrl->ctrl.cntlid == nctrl->cntlid)
+ __nvme_loop_del_ctrl(ctrl);
+ }
+ mutex_unlock(&nvme_loop_ctrl_mutex);
+}
+
+static void nvme_loop_reset_ctrl_work(struct work_struct *work)
+{
+ struct nvme_loop_ctrl *ctrl =
+ container_of(work, struct nvme_loop_ctrl, ctrl.reset_work);
+ bool changed;
+ int ret;
+
+ nvme_stop_ctrl(&ctrl->ctrl);
+ nvme_loop_shutdown_ctrl(ctrl);
+
+ ret = nvme_loop_configure_admin_queue(ctrl);
+ if (ret)
+ goto out_disable;
+
+ ret = nvme_loop_init_io_queues(ctrl);
+ if (ret)
+ goto out_destroy_admin;
+
+ ret = nvme_loop_connect_io_queues(ctrl);
+ if (ret)
+ goto out_destroy_io;
+
+ blk_mq_update_nr_hw_queues(&ctrl->tag_set,
+ ctrl->ctrl.queue_count - 1);
+
+ changed = nvme_change_ctrl_state(&ctrl->ctrl, NVME_CTRL_LIVE);
+ WARN_ON_ONCE(!changed);
+
+ nvme_start_ctrl(&ctrl->ctrl);
+
+ return;
+
+out_destroy_io:
+ nvme_loop_destroy_io_queues(ctrl);
+out_destroy_admin:
+ nvme_loop_destroy_admin_queue(ctrl);
+out_disable:
+ dev_warn(ctrl->ctrl.device, "Removing after reset failure\n");
+ nvme_uninit_ctrl(&ctrl->ctrl);
+ nvme_put_ctrl(&ctrl->ctrl);
+}
+
+static const struct nvme_ctrl_ops nvme_loop_ctrl_ops = {
+ .name = "loop",
+ .module = THIS_MODULE,
+ .flags = NVME_F_FABRICS,
+ .reg_read32 = nvmf_reg_read32,
+ .reg_read64 = nvmf_reg_read64,
+ .reg_write32 = nvmf_reg_write32,
+ .free_ctrl = nvme_loop_free_ctrl,
+ .submit_async_event = nvme_loop_submit_async_event,
+ .delete_ctrl = nvme_loop_del_ctrl,
+};
+
+static int nvme_loop_create_io_queues(struct nvme_loop_ctrl *ctrl)
+{
+ int ret;
+
+ ret = nvme_loop_init_io_queues(ctrl);
+ if (ret)
+ return ret;
+
+ memset(&ctrl->tag_set, 0, sizeof(ctrl->tag_set));
+ ctrl->tag_set.ops = &nvme_loop_mq_ops;
+ ctrl->tag_set.queue_depth = ctrl->ctrl.opts->queue_size;
+ ctrl->tag_set.reserved_tags = 1; /* fabric connect */
+ ctrl->tag_set.numa_node = NUMA_NO_NODE;
+ ctrl->tag_set.flags = BLK_MQ_F_SHOULD_MERGE;
+ ctrl->tag_set.cmd_size = sizeof(struct nvme_loop_iod) +
+ SG_CHUNK_SIZE * sizeof(struct scatterlist);
+ ctrl->tag_set.driver_data = ctrl;
+ ctrl->tag_set.nr_hw_queues = ctrl->ctrl.queue_count - 1;
+ ctrl->tag_set.timeout = NVME_IO_TIMEOUT;
+ ctrl->ctrl.tagset = &ctrl->tag_set;
+
+ ret = blk_mq_alloc_tag_set(&ctrl->tag_set);
+ if (ret)
+ goto out_destroy_queues;
+
+ ctrl->ctrl.connect_q = blk_mq_init_queue(&ctrl->tag_set);
+ if (IS_ERR(ctrl->ctrl.connect_q)) {
+ ret = PTR_ERR(ctrl->ctrl.connect_q);
+ goto out_free_tagset;
+ }
+
+ ret = nvme_loop_connect_io_queues(ctrl);
+ if (ret)
+ goto out_cleanup_connect_q;
+
+ return 0;
+
+out_cleanup_connect_q:
+ blk_cleanup_queue(ctrl->ctrl.connect_q);
+out_free_tagset:
+ blk_mq_free_tag_set(&ctrl->tag_set);
+out_destroy_queues:
+ nvme_loop_destroy_io_queues(ctrl);
+ return ret;
+}
+
+static struct nvme_ctrl *nvme_loop_create_ctrl(struct device *dev,
+ struct nvmf_ctrl_options *opts)
+{
+ struct nvme_loop_ctrl *ctrl;
+ bool changed;
+ int ret;
+
+ ctrl = kzalloc(sizeof(*ctrl), GFP_KERNEL);
+ if (!ctrl)
+ return ERR_PTR(-ENOMEM);
+ ctrl->ctrl.opts = opts;
+ INIT_LIST_HEAD(&ctrl->list);
+
+ INIT_WORK(&ctrl->delete_work, nvme_loop_del_ctrl_work);
+ INIT_WORK(&ctrl->ctrl.reset_work, nvme_loop_reset_ctrl_work);
+
+ ret = nvme_init_ctrl(&ctrl->ctrl, dev, &nvme_loop_ctrl_ops,
+ 0 /* no quirks, we're perfect! */);
+ if (ret)
+ goto out_put_ctrl;
+
+ ret = -ENOMEM;
+
+ ctrl->ctrl.sqsize = opts->queue_size - 1;
+ ctrl->ctrl.kato = opts->kato;
+
+ ctrl->queues = kcalloc(opts->nr_io_queues + 1, sizeof(*ctrl->queues),
+ GFP_KERNEL);
+ if (!ctrl->queues)
+ goto out_uninit_ctrl;
+
+ ret = nvme_loop_configure_admin_queue(ctrl);
+ if (ret)
+ goto out_free_queues;
+
+ if (opts->queue_size > ctrl->ctrl.maxcmd) {
+ /* warn if maxcmd is lower than queue_size */
+ dev_warn(ctrl->ctrl.device,
+ "queue_size %zu > ctrl maxcmd %u, clamping down\n",
+ opts->queue_size, ctrl->ctrl.maxcmd);
+ opts->queue_size = ctrl->ctrl.maxcmd;
+ }
+
+ if (opts->nr_io_queues) {
+ ret = nvme_loop_create_io_queues(ctrl);
+ if (ret)
+ goto out_remove_admin_queue;
+ }
+
+ nvme_loop_init_iod(ctrl, &ctrl->async_event_iod, 0);
+
+ dev_info(ctrl->ctrl.device,
+ "new ctrl: \"%s\"\n", ctrl->ctrl.opts->subsysnqn);
+
+ kref_get(&ctrl->ctrl.kref);
+
+ changed = nvme_change_ctrl_state(&ctrl->ctrl, NVME_CTRL_LIVE);
+ WARN_ON_ONCE(!changed);
+
+ mutex_lock(&nvme_loop_ctrl_mutex);
+ list_add_tail(&ctrl->list, &nvme_loop_ctrl_list);
+ mutex_unlock(&nvme_loop_ctrl_mutex);
+
+ nvme_start_ctrl(&ctrl->ctrl);
+
+ return &ctrl->ctrl;
+
+out_remove_admin_queue:
+ nvme_loop_destroy_admin_queue(ctrl);
+out_free_queues:
+ kfree(ctrl->queues);
+out_uninit_ctrl:
+ nvme_uninit_ctrl(&ctrl->ctrl);
+out_put_ctrl:
+ nvme_put_ctrl(&ctrl->ctrl);
+ if (ret > 0)
+ ret = -EIO;
+ return ERR_PTR(ret);
+}
+
+static int nvme_loop_add_port(struct nvmet_port *port)
+{
+ /*
+ * XXX: disalow adding more than one port so
+ * there is no connection rejections when a
+ * a subsystem is assigned to a port for which
+ * loop doesn't have a pointer.
+ * This scenario would be possible if we allowed
+ * more than one port to be added and a subsystem
+ * was assigned to a port other than nvmet_loop_port.
+ */
+
+ if (nvmet_loop_port)
+ return -EPERM;
+
+ nvmet_loop_port = port;
+ return 0;
+}
+
+static void nvme_loop_remove_port(struct nvmet_port *port)
+{
+ if (port == nvmet_loop_port)
+ nvmet_loop_port = NULL;
+}
+
+static struct nvmet_fabrics_ops nvme_loop_ops = {
+ .owner = THIS_MODULE,
+ .type = NVMF_TRTYPE_LOOP,
+ .add_port = nvme_loop_add_port,
+ .remove_port = nvme_loop_remove_port,
+ .queue_response = nvme_loop_queue_response,
+ .delete_ctrl = nvme_loop_delete_ctrl,
+};
+
+static struct nvmf_transport_ops nvme_loop_transport = {
+ .name = "loop",
+ .create_ctrl = nvme_loop_create_ctrl,
+};
+
+static int __init nvme_loop_init_module(void)
+{
+ int ret;
+
+ ret = nvmet_register_transport(&nvme_loop_ops);
+ if (ret)
+ return ret;
+
+ ret = nvmf_register_transport(&nvme_loop_transport);
+ if (ret)
+ nvmet_unregister_transport(&nvme_loop_ops);
+
+ return ret;
+}
+
+static void __exit nvme_loop_cleanup_module(void)
+{
+ struct nvme_loop_ctrl *ctrl, *next;
+
+ nvmf_unregister_transport(&nvme_loop_transport);
+ nvmet_unregister_transport(&nvme_loop_ops);
+
+ mutex_lock(&nvme_loop_ctrl_mutex);
+ list_for_each_entry_safe(ctrl, next, &nvme_loop_ctrl_list, list)
+ __nvme_loop_del_ctrl(ctrl);
+ mutex_unlock(&nvme_loop_ctrl_mutex);
+
+ flush_workqueue(nvme_wq);
+}
+
+module_init(nvme_loop_init_module);
+module_exit(nvme_loop_cleanup_module);
+
+MODULE_LICENSE("GPL v2");
+MODULE_ALIAS("nvmet-transport-254"); /* 254 == NVMF_TRTYPE_LOOP */
diff --git a/src/kernel/linux/v4.14/drivers/nvme/target/nvmet.h b/src/kernel/linux/v4.14/drivers/nvme/target/nvmet.h
new file mode 100644
index 0000000..87e429b
--- /dev/null
+++ b/src/kernel/linux/v4.14/drivers/nvme/target/nvmet.h
@@ -0,0 +1,335 @@
+/*
+ * Copyright (c) 2015-2016 HGST, a Western Digital Company.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ */
+
+#ifndef _NVMET_H
+#define _NVMET_H
+
+#include <linux/dma-mapping.h>
+#include <linux/types.h>
+#include <linux/device.h>
+#include <linux/kref.h>
+#include <linux/percpu-refcount.h>
+#include <linux/list.h>
+#include <linux/mutex.h>
+#include <linux/uuid.h>
+#include <linux/nvme.h>
+#include <linux/configfs.h>
+#include <linux/rcupdate.h>
+#include <linux/blkdev.h>
+
+#define NVMET_ASYNC_EVENTS 4
+#define NVMET_ERROR_LOG_SLOTS 128
+
+/* Helper Macros when NVMe error is NVME_SC_CONNECT_INVALID_PARAM
+ * The 16 bit shift is to set IATTR bit to 1, which means offending
+ * offset starts in the data section of connect()
+ */
+#define IPO_IATTR_CONNECT_DATA(x) \
+ (cpu_to_le32((1 << 16) | (offsetof(struct nvmf_connect_data, x))))
+#define IPO_IATTR_CONNECT_SQE(x) \
+ (cpu_to_le32(offsetof(struct nvmf_connect_command, x)))
+
+struct nvmet_ns {
+ struct list_head dev_link;
+ struct percpu_ref ref;
+ struct block_device *bdev;
+ u32 nsid;
+ u32 blksize_shift;
+ loff_t size;
+ u8 nguid[16];
+ uuid_t uuid;
+
+ bool enabled;
+ struct nvmet_subsys *subsys;
+ const char *device_path;
+
+ struct config_group device_group;
+ struct config_group group;
+
+ struct completion disable_done;
+};
+
+static inline struct nvmet_ns *to_nvmet_ns(struct config_item *item)
+{
+ return container_of(to_config_group(item), struct nvmet_ns, group);
+}
+
+struct nvmet_cq {
+ u16 qid;
+ u16 size;
+};
+
+struct nvmet_sq {
+ struct nvmet_ctrl *ctrl;
+ struct percpu_ref ref;
+ u16 qid;
+ u16 size;
+ u32 sqhd;
+ struct completion free_done;
+ struct completion confirm_done;
+};
+
+/**
+ * struct nvmet_port - Common structure to keep port
+ * information for the target.
+ * @entry: List head for holding a list of these elements.
+ * @disc_addr: Address information is stored in a format defined
+ * for a discovery log page entry.
+ * @group: ConfigFS group for this element's folder.
+ * @priv: Private data for the transport.
+ */
+struct nvmet_port {
+ struct list_head entry;
+ struct nvmf_disc_rsp_page_entry disc_addr;
+ struct config_group group;
+ struct config_group subsys_group;
+ struct list_head subsystems;
+ struct config_group referrals_group;
+ struct list_head referrals;
+ void *priv;
+ bool enabled;
+};
+
+static inline struct nvmet_port *to_nvmet_port(struct config_item *item)
+{
+ return container_of(to_config_group(item), struct nvmet_port,
+ group);
+}
+
+struct nvmet_ctrl {
+ struct nvmet_subsys *subsys;
+ struct nvmet_cq **cqs;
+ struct nvmet_sq **sqs;
+
+ struct mutex lock;
+ u64 cap;
+ u32 cc;
+ u32 csts;
+
+ uuid_t hostid;
+ u16 cntlid;
+ u32 kato;
+
+ struct nvmet_req *async_event_cmds[NVMET_ASYNC_EVENTS];
+ unsigned int nr_async_event_cmds;
+ struct list_head async_events;
+ struct work_struct async_event_work;
+
+ struct list_head subsys_entry;
+ struct kref ref;
+ struct delayed_work ka_work;
+ struct work_struct fatal_err_work;
+
+ struct nvmet_fabrics_ops *ops;
+
+ char subsysnqn[NVMF_NQN_FIELD_LEN];
+ char hostnqn[NVMF_NQN_FIELD_LEN];
+};
+
+struct nvmet_subsys {
+ enum nvme_subsys_type type;
+
+ struct mutex lock;
+ struct kref ref;
+
+ struct list_head namespaces;
+ unsigned int max_nsid;
+
+ struct list_head ctrls;
+
+ struct list_head hosts;
+ bool allow_any_host;
+
+ u16 max_qid;
+
+ u64 ver;
+ u64 serial;
+ char *subsysnqn;
+
+ struct config_group group;
+
+ struct config_group namespaces_group;
+ struct config_group allowed_hosts_group;
+};
+
+static inline struct nvmet_subsys *to_subsys(struct config_item *item)
+{
+ return container_of(to_config_group(item), struct nvmet_subsys, group);
+}
+
+static inline struct nvmet_subsys *namespaces_to_subsys(
+ struct config_item *item)
+{
+ return container_of(to_config_group(item), struct nvmet_subsys,
+ namespaces_group);
+}
+
+struct nvmet_host {
+ struct config_group group;
+};
+
+static inline struct nvmet_host *to_host(struct config_item *item)
+{
+ return container_of(to_config_group(item), struct nvmet_host, group);
+}
+
+static inline char *nvmet_host_name(struct nvmet_host *host)
+{
+ return config_item_name(&host->group.cg_item);
+}
+
+struct nvmet_host_link {
+ struct list_head entry;
+ struct nvmet_host *host;
+};
+
+struct nvmet_subsys_link {
+ struct list_head entry;
+ struct nvmet_subsys *subsys;
+};
+
+struct nvmet_req;
+struct nvmet_fabrics_ops {
+ struct module *owner;
+ unsigned int type;
+ unsigned int sqe_inline_size;
+ unsigned int msdbd;
+ bool has_keyed_sgls : 1;
+ void (*queue_response)(struct nvmet_req *req);
+ int (*add_port)(struct nvmet_port *port);
+ void (*remove_port)(struct nvmet_port *port);
+ void (*delete_ctrl)(struct nvmet_ctrl *ctrl);
+};
+
+#define NVMET_MAX_INLINE_BIOVEC 8
+
+struct nvmet_req {
+ struct nvme_command *cmd;
+ struct nvme_completion *rsp;
+ struct nvmet_sq *sq;
+ struct nvmet_cq *cq;
+ struct nvmet_ns *ns;
+ struct scatterlist *sg;
+ struct bio inline_bio;
+ struct bio_vec inline_bvec[NVMET_MAX_INLINE_BIOVEC];
+ int sg_cnt;
+ size_t data_len;
+
+ struct nvmet_port *port;
+
+ void (*execute)(struct nvmet_req *req);
+ struct nvmet_fabrics_ops *ops;
+};
+
+static inline void nvmet_set_status(struct nvmet_req *req, u16 status)
+{
+ req->rsp->status = cpu_to_le16(status << 1);
+}
+
+static inline void nvmet_set_result(struct nvmet_req *req, u32 result)
+{
+ req->rsp->result.u32 = cpu_to_le32(result);
+}
+
+/*
+ * NVMe command writes actually are DMA reads for us on the target side.
+ */
+static inline enum dma_data_direction
+nvmet_data_dir(struct nvmet_req *req)
+{
+ return nvme_is_write(req->cmd) ? DMA_FROM_DEVICE : DMA_TO_DEVICE;
+}
+
+struct nvmet_async_event {
+ struct list_head entry;
+ u8 event_type;
+ u8 event_info;
+ u8 log_page;
+};
+
+u16 nvmet_parse_connect_cmd(struct nvmet_req *req);
+u16 nvmet_parse_io_cmd(struct nvmet_req *req);
+u16 nvmet_parse_admin_cmd(struct nvmet_req *req);
+u16 nvmet_parse_discovery_cmd(struct nvmet_req *req);
+u16 nvmet_parse_fabrics_cmd(struct nvmet_req *req);
+
+bool nvmet_req_init(struct nvmet_req *req, struct nvmet_cq *cq,
+ struct nvmet_sq *sq, struct nvmet_fabrics_ops *ops);
+void nvmet_req_uninit(struct nvmet_req *req);
+void nvmet_req_complete(struct nvmet_req *req, u16 status);
+
+void nvmet_cq_setup(struct nvmet_ctrl *ctrl, struct nvmet_cq *cq, u16 qid,
+ u16 size);
+void nvmet_sq_setup(struct nvmet_ctrl *ctrl, struct nvmet_sq *sq, u16 qid,
+ u16 size);
+void nvmet_sq_destroy(struct nvmet_sq *sq);
+int nvmet_sq_init(struct nvmet_sq *sq);
+
+void nvmet_ctrl_fatal_error(struct nvmet_ctrl *ctrl);
+
+void nvmet_update_cc(struct nvmet_ctrl *ctrl, u32 new);
+u16 nvmet_alloc_ctrl(const char *subsysnqn, const char *hostnqn,
+ struct nvmet_req *req, u32 kato, struct nvmet_ctrl **ctrlp);
+u16 nvmet_ctrl_find_get(const char *subsysnqn, const char *hostnqn, u16 cntlid,
+ struct nvmet_req *req, struct nvmet_ctrl **ret);
+void nvmet_ctrl_put(struct nvmet_ctrl *ctrl);
+u16 nvmet_check_ctrl_status(struct nvmet_req *req, struct nvme_command *cmd);
+
+struct nvmet_subsys *nvmet_subsys_alloc(const char *subsysnqn,
+ enum nvme_subsys_type type);
+void nvmet_subsys_put(struct nvmet_subsys *subsys);
+void nvmet_subsys_del_ctrls(struct nvmet_subsys *subsys);
+
+struct nvmet_ns *nvmet_find_namespace(struct nvmet_ctrl *ctrl, __le32 nsid);
+void nvmet_put_namespace(struct nvmet_ns *ns);
+int nvmet_ns_enable(struct nvmet_ns *ns);
+void nvmet_ns_disable(struct nvmet_ns *ns);
+struct nvmet_ns *nvmet_ns_alloc(struct nvmet_subsys *subsys, u32 nsid);
+void nvmet_ns_free(struct nvmet_ns *ns);
+
+int nvmet_register_transport(struct nvmet_fabrics_ops *ops);
+void nvmet_unregister_transport(struct nvmet_fabrics_ops *ops);
+
+int nvmet_enable_port(struct nvmet_port *port);
+void nvmet_disable_port(struct nvmet_port *port);
+
+void nvmet_referral_enable(struct nvmet_port *parent, struct nvmet_port *port);
+void nvmet_referral_disable(struct nvmet_port *port);
+
+u16 nvmet_copy_to_sgl(struct nvmet_req *req, off_t off, const void *buf,
+ size_t len);
+u16 nvmet_copy_from_sgl(struct nvmet_req *req, off_t off, void *buf,
+ size_t len);
+
+u32 nvmet_get_log_page_len(struct nvme_command *cmd);
+
+#define NVMET_QUEUE_SIZE 1024
+#define NVMET_NR_QUEUES 64
+#define NVMET_MAX_CMD NVMET_QUEUE_SIZE
+#define NVMET_KAS 10
+#define NVMET_DISC_KATO 120
+
+int __init nvmet_init_configfs(void);
+void __exit nvmet_exit_configfs(void);
+
+int __init nvmet_init_discovery(void);
+void nvmet_exit_discovery(void);
+
+extern struct nvmet_subsys *nvmet_disc_subsys;
+extern u64 nvmet_genctr;
+extern struct rw_semaphore nvmet_config_sem;
+
+bool nvmet_host_allowed(struct nvmet_req *req, struct nvmet_subsys *subsys,
+ const char *hostnqn);
+
+#endif /* _NVMET_H */
diff --git a/src/kernel/linux/v4.14/drivers/nvme/target/rdma.c b/src/kernel/linux/v4.14/drivers/nvme/target/rdma.c
new file mode 100644
index 0000000..da56cc2
--- /dev/null
+++ b/src/kernel/linux/v4.14/drivers/nvme/target/rdma.c
@@ -0,0 +1,1622 @@
+/*
+ * NVMe over Fabrics RDMA target.
+ * Copyright (c) 2015-2016 HGST, a Western Digital Company.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ */
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+#include <linux/atomic.h>
+#include <linux/ctype.h>
+#include <linux/delay.h>
+#include <linux/err.h>
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/nvme.h>
+#include <linux/slab.h>
+#include <linux/string.h>
+#include <linux/wait.h>
+#include <linux/inet.h>
+#include <asm/unaligned.h>
+
+#include <rdma/ib_verbs.h>
+#include <rdma/rdma_cm.h>
+#include <rdma/rw.h>
+
+#include <linux/nvme-rdma.h>
+#include "nvmet.h"
+
+/*
+ * We allow up to a page of inline data to go with the SQE
+ */
+#define NVMET_RDMA_INLINE_DATA_SIZE PAGE_SIZE
+
+struct nvmet_rdma_cmd {
+ struct ib_sge sge[2];
+ struct ib_cqe cqe;
+ struct ib_recv_wr wr;
+ struct scatterlist inline_sg;
+ struct page *inline_page;
+ struct nvme_command *nvme_cmd;
+ struct nvmet_rdma_queue *queue;
+};
+
+enum {
+ NVMET_RDMA_REQ_INLINE_DATA = (1 << 0),
+ NVMET_RDMA_REQ_INVALIDATE_RKEY = (1 << 1),
+};
+
+struct nvmet_rdma_rsp {
+ struct ib_sge send_sge;
+ struct ib_cqe send_cqe;
+ struct ib_send_wr send_wr;
+
+ struct nvmet_rdma_cmd *cmd;
+ struct nvmet_rdma_queue *queue;
+
+ struct ib_cqe read_cqe;
+ struct rdma_rw_ctx rw;
+
+ struct nvmet_req req;
+
+ bool allocated;
+ u8 n_rdma;
+ u32 flags;
+ u32 invalidate_rkey;
+
+ struct list_head wait_list;
+ struct list_head free_list;
+};
+
+enum nvmet_rdma_queue_state {
+ NVMET_RDMA_Q_CONNECTING,
+ NVMET_RDMA_Q_LIVE,
+ NVMET_RDMA_Q_DISCONNECTING,
+ NVMET_RDMA_IN_DEVICE_REMOVAL,
+};
+
+struct nvmet_rdma_queue {
+ struct rdma_cm_id *cm_id;
+ struct nvmet_port *port;
+ struct ib_cq *cq;
+ atomic_t sq_wr_avail;
+ struct nvmet_rdma_device *dev;
+ spinlock_t state_lock;
+ enum nvmet_rdma_queue_state state;
+ struct nvmet_cq nvme_cq;
+ struct nvmet_sq nvme_sq;
+
+ struct nvmet_rdma_rsp *rsps;
+ struct list_head free_rsps;
+ spinlock_t rsps_lock;
+ struct nvmet_rdma_cmd *cmds;
+
+ struct work_struct release_work;
+ struct list_head rsp_wait_list;
+ struct list_head rsp_wr_wait_list;
+ spinlock_t rsp_wr_wait_lock;
+
+ int idx;
+ int host_qid;
+ int recv_queue_size;
+ int send_queue_size;
+
+ struct list_head queue_list;
+};
+
+struct nvmet_rdma_device {
+ struct ib_device *device;
+ struct ib_pd *pd;
+ struct ib_srq *srq;
+ struct nvmet_rdma_cmd *srq_cmds;
+ size_t srq_size;
+ struct kref ref;
+ struct list_head entry;
+};
+
+static bool nvmet_rdma_use_srq;
+module_param_named(use_srq, nvmet_rdma_use_srq, bool, 0444);
+MODULE_PARM_DESC(use_srq, "Use shared receive queue.");
+
+static DEFINE_IDA(nvmet_rdma_queue_ida);
+static LIST_HEAD(nvmet_rdma_queue_list);
+static DEFINE_MUTEX(nvmet_rdma_queue_mutex);
+
+static LIST_HEAD(device_list);
+static DEFINE_MUTEX(device_list_mutex);
+
+static bool nvmet_rdma_execute_command(struct nvmet_rdma_rsp *rsp);
+static void nvmet_rdma_send_done(struct ib_cq *cq, struct ib_wc *wc);
+static void nvmet_rdma_recv_done(struct ib_cq *cq, struct ib_wc *wc);
+static void nvmet_rdma_read_data_done(struct ib_cq *cq, struct ib_wc *wc);
+static void nvmet_rdma_qp_event(struct ib_event *event, void *priv);
+static void nvmet_rdma_queue_disconnect(struct nvmet_rdma_queue *queue);
+static void nvmet_rdma_free_rsp(struct nvmet_rdma_device *ndev,
+ struct nvmet_rdma_rsp *r);
+static int nvmet_rdma_alloc_rsp(struct nvmet_rdma_device *ndev,
+ struct nvmet_rdma_rsp *r);
+
+static struct nvmet_fabrics_ops nvmet_rdma_ops;
+
+/* XXX: really should move to a generic header sooner or later.. */
+static inline u32 get_unaligned_le24(const u8 *p)
+{
+ return (u32)p[0] | (u32)p[1] << 8 | (u32)p[2] << 16;
+}
+
+static inline bool nvmet_rdma_need_data_in(struct nvmet_rdma_rsp *rsp)
+{
+ return nvme_is_write(rsp->req.cmd) &&
+ rsp->req.data_len &&
+ !(rsp->flags & NVMET_RDMA_REQ_INLINE_DATA);
+}
+
+static inline bool nvmet_rdma_need_data_out(struct nvmet_rdma_rsp *rsp)
+{
+ return !nvme_is_write(rsp->req.cmd) &&
+ rsp->req.data_len &&
+ !rsp->req.rsp->status &&
+ !(rsp->flags & NVMET_RDMA_REQ_INLINE_DATA);
+}
+
+static inline struct nvmet_rdma_rsp *
+nvmet_rdma_get_rsp(struct nvmet_rdma_queue *queue)
+{
+ struct nvmet_rdma_rsp *rsp;
+ unsigned long flags;
+
+ spin_lock_irqsave(&queue->rsps_lock, flags);
+ rsp = list_first_entry_or_null(&queue->free_rsps,
+ struct nvmet_rdma_rsp, free_list);
+ if (likely(rsp))
+ list_del(&rsp->free_list);
+ spin_unlock_irqrestore(&queue->rsps_lock, flags);
+
+ if (unlikely(!rsp)) {
+ int ret;
+
+ rsp = kzalloc(sizeof(*rsp), GFP_KERNEL);
+ if (unlikely(!rsp))
+ return NULL;
+ ret = nvmet_rdma_alloc_rsp(queue->dev, rsp);
+ if (unlikely(ret)) {
+ kfree(rsp);
+ return NULL;
+ }
+
+ rsp->allocated = true;
+ }
+
+ return rsp;
+}
+
+static inline void
+nvmet_rdma_put_rsp(struct nvmet_rdma_rsp *rsp)
+{
+ unsigned long flags;
+
+ if (unlikely(rsp->allocated)) {
+ nvmet_rdma_free_rsp(rsp->queue->dev, rsp);
+ kfree(rsp);
+ return;
+ }
+
+ spin_lock_irqsave(&rsp->queue->rsps_lock, flags);
+ list_add_tail(&rsp->free_list, &rsp->queue->free_rsps);
+ spin_unlock_irqrestore(&rsp->queue->rsps_lock, flags);
+}
+
+static void nvmet_rdma_free_sgl(struct scatterlist *sgl, unsigned int nents)
+{
+ struct scatterlist *sg;
+ int count;
+
+ if (!sgl || !nents)
+ return;
+
+ for_each_sg(sgl, sg, nents, count)
+ __free_page(sg_page(sg));
+ kfree(sgl);
+}
+
+static int nvmet_rdma_alloc_sgl(struct scatterlist **sgl, unsigned int *nents,
+ u32 length)
+{
+ struct scatterlist *sg;
+ struct page *page;
+ unsigned int nent;
+ int i = 0;
+
+ nent = DIV_ROUND_UP(length, PAGE_SIZE);
+ sg = kmalloc_array(nent, sizeof(struct scatterlist), GFP_KERNEL);
+ if (!sg)
+ goto out;
+
+ sg_init_table(sg, nent);
+
+ while (length) {
+ u32 page_len = min_t(u32, length, PAGE_SIZE);
+
+ page = alloc_page(GFP_KERNEL);
+ if (!page)
+ goto out_free_pages;
+
+ sg_set_page(&sg[i], page, page_len, 0);
+ length -= page_len;
+ i++;
+ }
+ *sgl = sg;
+ *nents = nent;
+ return 0;
+
+out_free_pages:
+ while (i > 0) {
+ i--;
+ __free_page(sg_page(&sg[i]));
+ }
+ kfree(sg);
+out:
+ return NVME_SC_INTERNAL;
+}
+
+static int nvmet_rdma_alloc_cmd(struct nvmet_rdma_device *ndev,
+ struct nvmet_rdma_cmd *c, bool admin)
+{
+ /* NVMe command / RDMA RECV */
+ c->nvme_cmd = kmalloc(sizeof(*c->nvme_cmd), GFP_KERNEL);
+ if (!c->nvme_cmd)
+ goto out;
+
+ c->sge[0].addr = ib_dma_map_single(ndev->device, c->nvme_cmd,
+ sizeof(*c->nvme_cmd), DMA_FROM_DEVICE);
+ if (ib_dma_mapping_error(ndev->device, c->sge[0].addr))
+ goto out_free_cmd;
+
+ c->sge[0].length = sizeof(*c->nvme_cmd);
+ c->sge[0].lkey = ndev->pd->local_dma_lkey;
+
+ if (!admin) {
+ c->inline_page = alloc_pages(GFP_KERNEL,
+ get_order(NVMET_RDMA_INLINE_DATA_SIZE));
+ if (!c->inline_page)
+ goto out_unmap_cmd;
+ c->sge[1].addr = ib_dma_map_page(ndev->device,
+ c->inline_page, 0, NVMET_RDMA_INLINE_DATA_SIZE,
+ DMA_FROM_DEVICE);
+ if (ib_dma_mapping_error(ndev->device, c->sge[1].addr))
+ goto out_free_inline_page;
+ c->sge[1].length = NVMET_RDMA_INLINE_DATA_SIZE;
+ c->sge[1].lkey = ndev->pd->local_dma_lkey;
+ }
+
+ c->cqe.done = nvmet_rdma_recv_done;
+
+ c->wr.wr_cqe = &c->cqe;
+ c->wr.sg_list = c->sge;
+ c->wr.num_sge = admin ? 1 : 2;
+
+ return 0;
+
+out_free_inline_page:
+ if (!admin) {
+ __free_pages(c->inline_page,
+ get_order(NVMET_RDMA_INLINE_DATA_SIZE));
+ }
+out_unmap_cmd:
+ ib_dma_unmap_single(ndev->device, c->sge[0].addr,
+ sizeof(*c->nvme_cmd), DMA_FROM_DEVICE);
+out_free_cmd:
+ kfree(c->nvme_cmd);
+
+out:
+ return -ENOMEM;
+}
+
+static void nvmet_rdma_free_cmd(struct nvmet_rdma_device *ndev,
+ struct nvmet_rdma_cmd *c, bool admin)
+{
+ if (!admin) {
+ ib_dma_unmap_page(ndev->device, c->sge[1].addr,
+ NVMET_RDMA_INLINE_DATA_SIZE, DMA_FROM_DEVICE);
+ __free_pages(c->inline_page,
+ get_order(NVMET_RDMA_INLINE_DATA_SIZE));
+ }
+ ib_dma_unmap_single(ndev->device, c->sge[0].addr,
+ sizeof(*c->nvme_cmd), DMA_FROM_DEVICE);
+ kfree(c->nvme_cmd);
+}
+
+static struct nvmet_rdma_cmd *
+nvmet_rdma_alloc_cmds(struct nvmet_rdma_device *ndev,
+ int nr_cmds, bool admin)
+{
+ struct nvmet_rdma_cmd *cmds;
+ int ret = -EINVAL, i;
+
+ cmds = kcalloc(nr_cmds, sizeof(struct nvmet_rdma_cmd), GFP_KERNEL);
+ if (!cmds)
+ goto out;
+
+ for (i = 0; i < nr_cmds; i++) {
+ ret = nvmet_rdma_alloc_cmd(ndev, cmds + i, admin);
+ if (ret)
+ goto out_free;
+ }
+
+ return cmds;
+
+out_free:
+ while (--i >= 0)
+ nvmet_rdma_free_cmd(ndev, cmds + i, admin);
+ kfree(cmds);
+out:
+ return ERR_PTR(ret);
+}
+
+static void nvmet_rdma_free_cmds(struct nvmet_rdma_device *ndev,
+ struct nvmet_rdma_cmd *cmds, int nr_cmds, bool admin)
+{
+ int i;
+
+ for (i = 0; i < nr_cmds; i++)
+ nvmet_rdma_free_cmd(ndev, cmds + i, admin);
+ kfree(cmds);
+}
+
+static int nvmet_rdma_alloc_rsp(struct nvmet_rdma_device *ndev,
+ struct nvmet_rdma_rsp *r)
+{
+ /* NVMe CQE / RDMA SEND */
+ r->req.rsp = kmalloc(sizeof(*r->req.rsp), GFP_KERNEL);
+ if (!r->req.rsp)
+ goto out;
+
+ r->send_sge.addr = ib_dma_map_single(ndev->device, r->req.rsp,
+ sizeof(*r->req.rsp), DMA_TO_DEVICE);
+ if (ib_dma_mapping_error(ndev->device, r->send_sge.addr))
+ goto out_free_rsp;
+
+ r->send_sge.length = sizeof(*r->req.rsp);
+ r->send_sge.lkey = ndev->pd->local_dma_lkey;
+
+ r->send_cqe.done = nvmet_rdma_send_done;
+
+ r->send_wr.wr_cqe = &r->send_cqe;
+ r->send_wr.sg_list = &r->send_sge;
+ r->send_wr.num_sge = 1;
+ r->send_wr.send_flags = IB_SEND_SIGNALED;
+
+ /* Data In / RDMA READ */
+ r->read_cqe.done = nvmet_rdma_read_data_done;
+ return 0;
+
+out_free_rsp:
+ kfree(r->req.rsp);
+out:
+ return -ENOMEM;
+}
+
+static void nvmet_rdma_free_rsp(struct nvmet_rdma_device *ndev,
+ struct nvmet_rdma_rsp *r)
+{
+ ib_dma_unmap_single(ndev->device, r->send_sge.addr,
+ sizeof(*r->req.rsp), DMA_TO_DEVICE);
+ kfree(r->req.rsp);
+}
+
+static int
+nvmet_rdma_alloc_rsps(struct nvmet_rdma_queue *queue)
+{
+ struct nvmet_rdma_device *ndev = queue->dev;
+ int nr_rsps = queue->recv_queue_size * 2;
+ int ret = -EINVAL, i;
+
+ queue->rsps = kcalloc(nr_rsps, sizeof(struct nvmet_rdma_rsp),
+ GFP_KERNEL);
+ if (!queue->rsps)
+ goto out;
+
+ for (i = 0; i < nr_rsps; i++) {
+ struct nvmet_rdma_rsp *rsp = &queue->rsps[i];
+
+ ret = nvmet_rdma_alloc_rsp(ndev, rsp);
+ if (ret)
+ goto out_free;
+
+ list_add_tail(&rsp->free_list, &queue->free_rsps);
+ }
+
+ return 0;
+
+out_free:
+ while (--i >= 0) {
+ struct nvmet_rdma_rsp *rsp = &queue->rsps[i];
+
+ list_del(&rsp->free_list);
+ nvmet_rdma_free_rsp(ndev, rsp);
+ }
+ kfree(queue->rsps);
+out:
+ return ret;
+}
+
+static void nvmet_rdma_free_rsps(struct nvmet_rdma_queue *queue)
+{
+ struct nvmet_rdma_device *ndev = queue->dev;
+ int i, nr_rsps = queue->recv_queue_size * 2;
+
+ for (i = 0; i < nr_rsps; i++) {
+ struct nvmet_rdma_rsp *rsp = &queue->rsps[i];
+
+ list_del(&rsp->free_list);
+ nvmet_rdma_free_rsp(ndev, rsp);
+ }
+ kfree(queue->rsps);
+}
+
+static int nvmet_rdma_post_recv(struct nvmet_rdma_device *ndev,
+ struct nvmet_rdma_cmd *cmd)
+{
+ struct ib_recv_wr *bad_wr;
+
+ ib_dma_sync_single_for_device(ndev->device,
+ cmd->sge[0].addr, cmd->sge[0].length,
+ DMA_FROM_DEVICE);
+
+ if (ndev->srq)
+ return ib_post_srq_recv(ndev->srq, &cmd->wr, &bad_wr);
+ return ib_post_recv(cmd->queue->cm_id->qp, &cmd->wr, &bad_wr);
+}
+
+static void nvmet_rdma_process_wr_wait_list(struct nvmet_rdma_queue *queue)
+{
+ spin_lock(&queue->rsp_wr_wait_lock);
+ while (!list_empty(&queue->rsp_wr_wait_list)) {
+ struct nvmet_rdma_rsp *rsp;
+ bool ret;
+
+ rsp = list_entry(queue->rsp_wr_wait_list.next,
+ struct nvmet_rdma_rsp, wait_list);
+ list_del(&rsp->wait_list);
+
+ spin_unlock(&queue->rsp_wr_wait_lock);
+ ret = nvmet_rdma_execute_command(rsp);
+ spin_lock(&queue->rsp_wr_wait_lock);
+
+ if (!ret) {
+ list_add(&rsp->wait_list, &queue->rsp_wr_wait_list);
+ break;
+ }
+ }
+ spin_unlock(&queue->rsp_wr_wait_lock);
+}
+
+
+static void nvmet_rdma_release_rsp(struct nvmet_rdma_rsp *rsp)
+{
+ struct nvmet_rdma_queue *queue = rsp->queue;
+
+ atomic_add(1 + rsp->n_rdma, &queue->sq_wr_avail);
+
+ if (rsp->n_rdma) {
+ rdma_rw_ctx_destroy(&rsp->rw, queue->cm_id->qp,
+ queue->cm_id->port_num, rsp->req.sg,
+ rsp->req.sg_cnt, nvmet_data_dir(&rsp->req));
+ }
+
+ if (rsp->req.sg != &rsp->cmd->inline_sg)
+ nvmet_rdma_free_sgl(rsp->req.sg, rsp->req.sg_cnt);
+
+ if (unlikely(!list_empty_careful(&queue->rsp_wr_wait_list)))
+ nvmet_rdma_process_wr_wait_list(queue);
+
+ nvmet_rdma_put_rsp(rsp);
+}
+
+static void nvmet_rdma_error_comp(struct nvmet_rdma_queue *queue)
+{
+ if (queue->nvme_sq.ctrl) {
+ nvmet_ctrl_fatal_error(queue->nvme_sq.ctrl);
+ } else {
+ /*
+ * we didn't setup the controller yet in case
+ * of admin connect error, just disconnect and
+ * cleanup the queue
+ */
+ nvmet_rdma_queue_disconnect(queue);
+ }
+}
+
+static void nvmet_rdma_send_done(struct ib_cq *cq, struct ib_wc *wc)
+{
+ struct nvmet_rdma_rsp *rsp =
+ container_of(wc->wr_cqe, struct nvmet_rdma_rsp, send_cqe);
+ struct nvmet_rdma_queue *queue = cq->cq_context;
+
+ nvmet_rdma_release_rsp(rsp);
+
+ if (unlikely(wc->status != IB_WC_SUCCESS &&
+ wc->status != IB_WC_WR_FLUSH_ERR)) {
+ pr_err("SEND for CQE 0x%p failed with status %s (%d).\n",
+ wc->wr_cqe, ib_wc_status_msg(wc->status), wc->status);
+ nvmet_rdma_error_comp(queue);
+ }
+}
+
+static void nvmet_rdma_queue_response(struct nvmet_req *req)
+{
+ struct nvmet_rdma_rsp *rsp =
+ container_of(req, struct nvmet_rdma_rsp, req);
+ struct rdma_cm_id *cm_id = rsp->queue->cm_id;
+ struct ib_send_wr *first_wr, *bad_wr;
+
+ if (rsp->flags & NVMET_RDMA_REQ_INVALIDATE_RKEY) {
+ rsp->send_wr.opcode = IB_WR_SEND_WITH_INV;
+ rsp->send_wr.ex.invalidate_rkey = rsp->invalidate_rkey;
+ } else {
+ rsp->send_wr.opcode = IB_WR_SEND;
+ }
+
+ if (nvmet_rdma_need_data_out(rsp))
+ first_wr = rdma_rw_ctx_wrs(&rsp->rw, cm_id->qp,
+ cm_id->port_num, NULL, &rsp->send_wr);
+ else
+ first_wr = &rsp->send_wr;
+
+ nvmet_rdma_post_recv(rsp->queue->dev, rsp->cmd);
+
+ ib_dma_sync_single_for_device(rsp->queue->dev->device,
+ rsp->send_sge.addr, rsp->send_sge.length,
+ DMA_TO_DEVICE);
+
+ if (ib_post_send(cm_id->qp, first_wr, &bad_wr)) {
+ pr_err("sending cmd response failed\n");
+ nvmet_rdma_release_rsp(rsp);
+ }
+}
+
+static void nvmet_rdma_read_data_done(struct ib_cq *cq, struct ib_wc *wc)
+{
+ struct nvmet_rdma_rsp *rsp =
+ container_of(wc->wr_cqe, struct nvmet_rdma_rsp, read_cqe);
+ struct nvmet_rdma_queue *queue = cq->cq_context;
+
+ WARN_ON(rsp->n_rdma <= 0);
+ atomic_add(rsp->n_rdma, &queue->sq_wr_avail);
+ rdma_rw_ctx_destroy(&rsp->rw, queue->cm_id->qp,
+ queue->cm_id->port_num, rsp->req.sg,
+ rsp->req.sg_cnt, nvmet_data_dir(&rsp->req));
+ rsp->n_rdma = 0;
+
+ if (unlikely(wc->status != IB_WC_SUCCESS)) {
+ nvmet_req_uninit(&rsp->req);
+ nvmet_rdma_release_rsp(rsp);
+ if (wc->status != IB_WC_WR_FLUSH_ERR) {
+ pr_info("RDMA READ for CQE 0x%p failed with status %s (%d).\n",
+ wc->wr_cqe, ib_wc_status_msg(wc->status), wc->status);
+ nvmet_rdma_error_comp(queue);
+ }
+ return;
+ }
+
+ rsp->req.execute(&rsp->req);
+}
+
+static void nvmet_rdma_use_inline_sg(struct nvmet_rdma_rsp *rsp, u32 len,
+ u64 off)
+{
+ sg_init_table(&rsp->cmd->inline_sg, 1);
+ sg_set_page(&rsp->cmd->inline_sg, rsp->cmd->inline_page, len, off);
+ rsp->req.sg = &rsp->cmd->inline_sg;
+ rsp->req.sg_cnt = 1;
+}
+
+static u16 nvmet_rdma_map_sgl_inline(struct nvmet_rdma_rsp *rsp)
+{
+ struct nvme_sgl_desc *sgl = &rsp->req.cmd->common.dptr.sgl;
+ u64 off = le64_to_cpu(sgl->addr);
+ u32 len = le32_to_cpu(sgl->length);
+
+ if (!nvme_is_write(rsp->req.cmd))
+ return NVME_SC_INVALID_FIELD | NVME_SC_DNR;
+
+ if (off + len > NVMET_RDMA_INLINE_DATA_SIZE) {
+ pr_err("invalid inline data offset!\n");
+ return NVME_SC_SGL_INVALID_OFFSET | NVME_SC_DNR;
+ }
+
+ /* no data command? */
+ if (!len)
+ return 0;
+
+ nvmet_rdma_use_inline_sg(rsp, len, off);
+ rsp->flags |= NVMET_RDMA_REQ_INLINE_DATA;
+ return 0;
+}
+
+static u16 nvmet_rdma_map_sgl_keyed(struct nvmet_rdma_rsp *rsp,
+ struct nvme_keyed_sgl_desc *sgl, bool invalidate)
+{
+ struct rdma_cm_id *cm_id = rsp->queue->cm_id;
+ u64 addr = le64_to_cpu(sgl->addr);
+ u32 len = get_unaligned_le24(sgl->length);
+ u32 key = get_unaligned_le32(sgl->key);
+ int ret;
+ u16 status;
+
+ /* no data command? */
+ if (!len)
+ return 0;
+
+ status = nvmet_rdma_alloc_sgl(&rsp->req.sg, &rsp->req.sg_cnt,
+ len);
+ if (status)
+ return status;
+
+ ret = rdma_rw_ctx_init(&rsp->rw, cm_id->qp, cm_id->port_num,
+ rsp->req.sg, rsp->req.sg_cnt, 0, addr, key,
+ nvmet_data_dir(&rsp->req));
+ if (ret < 0)
+ return NVME_SC_INTERNAL;
+ rsp->n_rdma += ret;
+
+ if (invalidate) {
+ rsp->invalidate_rkey = key;
+ rsp->flags |= NVMET_RDMA_REQ_INVALIDATE_RKEY;
+ }
+
+ return 0;
+}
+
+static u16 nvmet_rdma_map_sgl(struct nvmet_rdma_rsp *rsp)
+{
+ struct nvme_keyed_sgl_desc *sgl = &rsp->req.cmd->common.dptr.ksgl;
+
+ switch (sgl->type >> 4) {
+ case NVME_SGL_FMT_DATA_DESC:
+ switch (sgl->type & 0xf) {
+ case NVME_SGL_FMT_OFFSET:
+ return nvmet_rdma_map_sgl_inline(rsp);
+ default:
+ pr_err("invalid SGL subtype: %#x\n", sgl->type);
+ return NVME_SC_INVALID_FIELD | NVME_SC_DNR;
+ }
+ case NVME_KEY_SGL_FMT_DATA_DESC:
+ switch (sgl->type & 0xf) {
+ case NVME_SGL_FMT_ADDRESS | NVME_SGL_FMT_INVALIDATE:
+ return nvmet_rdma_map_sgl_keyed(rsp, sgl, true);
+ case NVME_SGL_FMT_ADDRESS:
+ return nvmet_rdma_map_sgl_keyed(rsp, sgl, false);
+ default:
+ pr_err("invalid SGL subtype: %#x\n", sgl->type);
+ return NVME_SC_INVALID_FIELD | NVME_SC_DNR;
+ }
+ default:
+ pr_err("invalid SGL type: %#x\n", sgl->type);
+ return NVME_SC_SGL_INVALID_TYPE | NVME_SC_DNR;
+ }
+}
+
+static bool nvmet_rdma_execute_command(struct nvmet_rdma_rsp *rsp)
+{
+ struct nvmet_rdma_queue *queue = rsp->queue;
+
+ if (unlikely(atomic_sub_return(1 + rsp->n_rdma,
+ &queue->sq_wr_avail) < 0)) {
+ pr_debug("IB send queue full (needed %d): queue %u cntlid %u\n",
+ 1 + rsp->n_rdma, queue->idx,
+ queue->nvme_sq.ctrl->cntlid);
+ atomic_add(1 + rsp->n_rdma, &queue->sq_wr_avail);
+ return false;
+ }
+
+ if (nvmet_rdma_need_data_in(rsp)) {
+ if (rdma_rw_ctx_post(&rsp->rw, queue->cm_id->qp,
+ queue->cm_id->port_num, &rsp->read_cqe, NULL))
+ nvmet_req_complete(&rsp->req, NVME_SC_DATA_XFER_ERROR);
+ } else {
+ rsp->req.execute(&rsp->req);
+ }
+
+ return true;
+}
+
+static void nvmet_rdma_handle_command(struct nvmet_rdma_queue *queue,
+ struct nvmet_rdma_rsp *cmd)
+{
+ u16 status;
+
+ ib_dma_sync_single_for_cpu(queue->dev->device,
+ cmd->cmd->sge[0].addr, cmd->cmd->sge[0].length,
+ DMA_FROM_DEVICE);
+ ib_dma_sync_single_for_cpu(queue->dev->device,
+ cmd->send_sge.addr, cmd->send_sge.length,
+ DMA_TO_DEVICE);
+
+ if (!nvmet_req_init(&cmd->req, &queue->nvme_cq,
+ &queue->nvme_sq, &nvmet_rdma_ops))
+ return;
+
+ status = nvmet_rdma_map_sgl(cmd);
+ if (status)
+ goto out_err;
+
+ if (unlikely(!nvmet_rdma_execute_command(cmd))) {
+ spin_lock(&queue->rsp_wr_wait_lock);
+ list_add_tail(&cmd->wait_list, &queue->rsp_wr_wait_list);
+ spin_unlock(&queue->rsp_wr_wait_lock);
+ }
+
+ return;
+
+out_err:
+ nvmet_req_complete(&cmd->req, status);
+}
+
+static void nvmet_rdma_recv_done(struct ib_cq *cq, struct ib_wc *wc)
+{
+ struct nvmet_rdma_cmd *cmd =
+ container_of(wc->wr_cqe, struct nvmet_rdma_cmd, cqe);
+ struct nvmet_rdma_queue *queue = cq->cq_context;
+ struct nvmet_rdma_rsp *rsp;
+
+ if (unlikely(wc->status != IB_WC_SUCCESS)) {
+ if (wc->status != IB_WC_WR_FLUSH_ERR) {
+ pr_err("RECV for CQE 0x%p failed with status %s (%d)\n",
+ wc->wr_cqe, ib_wc_status_msg(wc->status),
+ wc->status);
+ nvmet_rdma_error_comp(queue);
+ }
+ return;
+ }
+
+ if (unlikely(wc->byte_len < sizeof(struct nvme_command))) {
+ pr_err("Ctrl Fatal Error: capsule size less than 64 bytes\n");
+ nvmet_rdma_error_comp(queue);
+ return;
+ }
+
+ cmd->queue = queue;
+ rsp = nvmet_rdma_get_rsp(queue);
+ if (unlikely(!rsp)) {
+ /*
+ * we get here only under memory pressure,
+ * silently drop and have the host retry
+ * as we can't even fail it.
+ */
+ nvmet_rdma_post_recv(queue->dev, cmd);
+ return;
+ }
+ rsp->queue = queue;
+ rsp->cmd = cmd;
+ rsp->flags = 0;
+ rsp->req.cmd = cmd->nvme_cmd;
+ rsp->req.port = queue->port;
+ rsp->n_rdma = 0;
+
+ if (unlikely(queue->state != NVMET_RDMA_Q_LIVE)) {
+ unsigned long flags;
+
+ spin_lock_irqsave(&queue->state_lock, flags);
+ if (queue->state == NVMET_RDMA_Q_CONNECTING)
+ list_add_tail(&rsp->wait_list, &queue->rsp_wait_list);
+ else
+ nvmet_rdma_put_rsp(rsp);
+ spin_unlock_irqrestore(&queue->state_lock, flags);
+ return;
+ }
+
+ nvmet_rdma_handle_command(queue, rsp);
+}
+
+static void nvmet_rdma_destroy_srq(struct nvmet_rdma_device *ndev)
+{
+ if (!ndev->srq)
+ return;
+
+ nvmet_rdma_free_cmds(ndev, ndev->srq_cmds, ndev->srq_size, false);
+ ib_destroy_srq(ndev->srq);
+}
+
+static int nvmet_rdma_init_srq(struct nvmet_rdma_device *ndev)
+{
+ struct ib_srq_init_attr srq_attr = { NULL, };
+ struct ib_srq *srq;
+ size_t srq_size;
+ int ret, i;
+
+ srq_size = 4095; /* XXX: tune */
+
+ srq_attr.attr.max_wr = srq_size;
+ srq_attr.attr.max_sge = 2;
+ srq_attr.attr.srq_limit = 0;
+ srq_attr.srq_type = IB_SRQT_BASIC;
+ srq = ib_create_srq(ndev->pd, &srq_attr);
+ if (IS_ERR(srq)) {
+ /*
+ * If SRQs aren't supported we just go ahead and use normal
+ * non-shared receive queues.
+ */
+ pr_info("SRQ requested but not supported.\n");
+ return 0;
+ }
+
+ ndev->srq_cmds = nvmet_rdma_alloc_cmds(ndev, srq_size, false);
+ if (IS_ERR(ndev->srq_cmds)) {
+ ret = PTR_ERR(ndev->srq_cmds);
+ goto out_destroy_srq;
+ }
+
+ ndev->srq = srq;
+ ndev->srq_size = srq_size;
+
+ for (i = 0; i < srq_size; i++)
+ nvmet_rdma_post_recv(ndev, &ndev->srq_cmds[i]);
+
+ return 0;
+
+out_destroy_srq:
+ ib_destroy_srq(srq);
+ return ret;
+}
+
+static void nvmet_rdma_free_dev(struct kref *ref)
+{
+ struct nvmet_rdma_device *ndev =
+ container_of(ref, struct nvmet_rdma_device, ref);
+
+ mutex_lock(&device_list_mutex);
+ list_del(&ndev->entry);
+ mutex_unlock(&device_list_mutex);
+
+ nvmet_rdma_destroy_srq(ndev);
+ ib_dealloc_pd(ndev->pd);
+
+ kfree(ndev);
+}
+
+static struct nvmet_rdma_device *
+nvmet_rdma_find_get_device(struct rdma_cm_id *cm_id)
+{
+ struct nvmet_rdma_device *ndev;
+ int ret;
+
+ mutex_lock(&device_list_mutex);
+ list_for_each_entry(ndev, &device_list, entry) {
+ if (ndev->device->node_guid == cm_id->device->node_guid &&
+ kref_get_unless_zero(&ndev->ref))
+ goto out_unlock;
+ }
+
+ ndev = kzalloc(sizeof(*ndev), GFP_KERNEL);
+ if (!ndev)
+ goto out_err;
+
+ ndev->device = cm_id->device;
+ kref_init(&ndev->ref);
+
+ ndev->pd = ib_alloc_pd(ndev->device, 0);
+ if (IS_ERR(ndev->pd))
+ goto out_free_dev;
+
+ if (nvmet_rdma_use_srq) {
+ ret = nvmet_rdma_init_srq(ndev);
+ if (ret)
+ goto out_free_pd;
+ }
+
+ list_add(&ndev->entry, &device_list);
+out_unlock:
+ mutex_unlock(&device_list_mutex);
+ pr_debug("added %s.\n", ndev->device->name);
+ return ndev;
+
+out_free_pd:
+ ib_dealloc_pd(ndev->pd);
+out_free_dev:
+ kfree(ndev);
+out_err:
+ mutex_unlock(&device_list_mutex);
+ return NULL;
+}
+
+static int nvmet_rdma_create_queue_ib(struct nvmet_rdma_queue *queue)
+{
+ struct ib_qp_init_attr qp_attr;
+ struct nvmet_rdma_device *ndev = queue->dev;
+ int comp_vector, nr_cqe, ret, i;
+
+ /*
+ * Spread the io queues across completion vectors,
+ * but still keep all admin queues on vector 0.
+ */
+ comp_vector = !queue->host_qid ? 0 :
+ queue->idx % ndev->device->num_comp_vectors;
+
+ /*
+ * Reserve CQ slots for RECV + RDMA_READ/RDMA_WRITE + RDMA_SEND.
+ */
+ nr_cqe = queue->recv_queue_size + 2 * queue->send_queue_size;
+
+ queue->cq = ib_alloc_cq(ndev->device, queue,
+ nr_cqe + 1, comp_vector,
+ IB_POLL_WORKQUEUE);
+ if (IS_ERR(queue->cq)) {
+ ret = PTR_ERR(queue->cq);
+ pr_err("failed to create CQ cqe= %d ret= %d\n",
+ nr_cqe + 1, ret);
+ goto out;
+ }
+
+ memset(&qp_attr, 0, sizeof(qp_attr));
+ qp_attr.qp_context = queue;
+ qp_attr.event_handler = nvmet_rdma_qp_event;
+ qp_attr.send_cq = queue->cq;
+ qp_attr.recv_cq = queue->cq;
+ qp_attr.sq_sig_type = IB_SIGNAL_REQ_WR;
+ qp_attr.qp_type = IB_QPT_RC;
+ /* +1 for drain */
+ qp_attr.cap.max_send_wr = queue->send_queue_size + 1;
+ qp_attr.cap.max_rdma_ctxs = queue->send_queue_size;
+ qp_attr.cap.max_send_sge = max(ndev->device->attrs.max_sge_rd,
+ ndev->device->attrs.max_sge);
+
+ if (ndev->srq) {
+ qp_attr.srq = ndev->srq;
+ } else {
+ /* +1 for drain */
+ qp_attr.cap.max_recv_wr = 1 + queue->recv_queue_size;
+ qp_attr.cap.max_recv_sge = 2;
+ }
+
+ ret = rdma_create_qp(queue->cm_id, ndev->pd, &qp_attr);
+ if (ret) {
+ pr_err("failed to create_qp ret= %d\n", ret);
+ goto err_destroy_cq;
+ }
+
+ atomic_set(&queue->sq_wr_avail, qp_attr.cap.max_send_wr);
+
+ pr_debug("%s: max_cqe= %d max_sge= %d sq_size = %d cm_id= %p\n",
+ __func__, queue->cq->cqe, qp_attr.cap.max_send_sge,
+ qp_attr.cap.max_send_wr, queue->cm_id);
+
+ if (!ndev->srq) {
+ for (i = 0; i < queue->recv_queue_size; i++) {
+ queue->cmds[i].queue = queue;
+ nvmet_rdma_post_recv(ndev, &queue->cmds[i]);
+ }
+ }
+
+out:
+ return ret;
+
+err_destroy_cq:
+ ib_free_cq(queue->cq);
+ goto out;
+}
+
+static void nvmet_rdma_destroy_queue_ib(struct nvmet_rdma_queue *queue)
+{
+ ib_drain_qp(queue->cm_id->qp);
+ rdma_destroy_qp(queue->cm_id);
+ ib_free_cq(queue->cq);
+}
+
+static void nvmet_rdma_free_queue(struct nvmet_rdma_queue *queue)
+{
+ pr_info("freeing queue %d\n", queue->idx);
+
+ nvmet_sq_destroy(&queue->nvme_sq);
+
+ nvmet_rdma_destroy_queue_ib(queue);
+ if (!queue->dev->srq) {
+ nvmet_rdma_free_cmds(queue->dev, queue->cmds,
+ queue->recv_queue_size,
+ !queue->host_qid);
+ }
+ nvmet_rdma_free_rsps(queue);
+ ida_simple_remove(&nvmet_rdma_queue_ida, queue->idx);
+ kfree(queue);
+}
+
+static void nvmet_rdma_release_queue_work(struct work_struct *w)
+{
+ struct nvmet_rdma_queue *queue =
+ container_of(w, struct nvmet_rdma_queue, release_work);
+ struct rdma_cm_id *cm_id = queue->cm_id;
+ struct nvmet_rdma_device *dev = queue->dev;
+ enum nvmet_rdma_queue_state state = queue->state;
+
+ nvmet_rdma_free_queue(queue);
+
+ if (state != NVMET_RDMA_IN_DEVICE_REMOVAL)
+ rdma_destroy_id(cm_id);
+
+ kref_put(&dev->ref, nvmet_rdma_free_dev);
+}
+
+static int
+nvmet_rdma_parse_cm_connect_req(struct rdma_conn_param *conn,
+ struct nvmet_rdma_queue *queue)
+{
+ struct nvme_rdma_cm_req *req;
+
+ req = (struct nvme_rdma_cm_req *)conn->private_data;
+ if (!req || conn->private_data_len == 0)
+ return NVME_RDMA_CM_INVALID_LEN;
+
+ if (le16_to_cpu(req->recfmt) != NVME_RDMA_CM_FMT_1_0)
+ return NVME_RDMA_CM_INVALID_RECFMT;
+
+ queue->host_qid = le16_to_cpu(req->qid);
+
+ /*
+ * req->hsqsize corresponds to our recv queue size plus 1
+ * req->hrqsize corresponds to our send queue size
+ */
+ queue->recv_queue_size = le16_to_cpu(req->hsqsize) + 1;
+ queue->send_queue_size = le16_to_cpu(req->hrqsize);
+
+ if (!queue->host_qid && queue->recv_queue_size > NVME_AQ_DEPTH)
+ return NVME_RDMA_CM_INVALID_HSQSIZE;
+
+ /* XXX: Should we enforce some kind of max for IO queues? */
+
+ return 0;
+}
+
+static int nvmet_rdma_cm_reject(struct rdma_cm_id *cm_id,
+ enum nvme_rdma_cm_status status)
+{
+ struct nvme_rdma_cm_rej rej;
+
+ pr_debug("rejecting connect request: status %d (%s)\n",
+ status, nvme_rdma_cm_msg(status));
+
+ rej.recfmt = cpu_to_le16(NVME_RDMA_CM_FMT_1_0);
+ rej.sts = cpu_to_le16(status);
+
+ return rdma_reject(cm_id, (void *)&rej, sizeof(rej));
+}
+
+static struct nvmet_rdma_queue *
+nvmet_rdma_alloc_queue(struct nvmet_rdma_device *ndev,
+ struct rdma_cm_id *cm_id,
+ struct rdma_cm_event *event)
+{
+ struct nvmet_rdma_queue *queue;
+ int ret;
+
+ queue = kzalloc(sizeof(*queue), GFP_KERNEL);
+ if (!queue) {
+ ret = NVME_RDMA_CM_NO_RSC;
+ goto out_reject;
+ }
+
+ ret = nvmet_sq_init(&queue->nvme_sq);
+ if (ret) {
+ ret = NVME_RDMA_CM_NO_RSC;
+ goto out_free_queue;
+ }
+
+ ret = nvmet_rdma_parse_cm_connect_req(&event->param.conn, queue);
+ if (ret)
+ goto out_destroy_sq;
+
+ /*
+ * Schedules the actual release because calling rdma_destroy_id from
+ * inside a CM callback would trigger a deadlock. (great API design..)
+ */
+ INIT_WORK(&queue->release_work, nvmet_rdma_release_queue_work);
+ queue->dev = ndev;
+ queue->cm_id = cm_id;
+
+ spin_lock_init(&queue->state_lock);
+ queue->state = NVMET_RDMA_Q_CONNECTING;
+ INIT_LIST_HEAD(&queue->rsp_wait_list);
+ INIT_LIST_HEAD(&queue->rsp_wr_wait_list);
+ spin_lock_init(&queue->rsp_wr_wait_lock);
+ INIT_LIST_HEAD(&queue->free_rsps);
+ spin_lock_init(&queue->rsps_lock);
+ INIT_LIST_HEAD(&queue->queue_list);
+
+ queue->idx = ida_simple_get(&nvmet_rdma_queue_ida, 0, 0, GFP_KERNEL);
+ if (queue->idx < 0) {
+ ret = NVME_RDMA_CM_NO_RSC;
+ goto out_destroy_sq;
+ }
+
+ ret = nvmet_rdma_alloc_rsps(queue);
+ if (ret) {
+ ret = NVME_RDMA_CM_NO_RSC;
+ goto out_ida_remove;
+ }
+
+ if (!ndev->srq) {
+ queue->cmds = nvmet_rdma_alloc_cmds(ndev,
+ queue->recv_queue_size,
+ !queue->host_qid);
+ if (IS_ERR(queue->cmds)) {
+ ret = NVME_RDMA_CM_NO_RSC;
+ goto out_free_responses;
+ }
+ }
+
+ ret = nvmet_rdma_create_queue_ib(queue);
+ if (ret) {
+ pr_err("%s: creating RDMA queue failed (%d).\n",
+ __func__, ret);
+ ret = NVME_RDMA_CM_NO_RSC;
+ goto out_free_cmds;
+ }
+
+ return queue;
+
+out_free_cmds:
+ if (!ndev->srq) {
+ nvmet_rdma_free_cmds(queue->dev, queue->cmds,
+ queue->recv_queue_size,
+ !queue->host_qid);
+ }
+out_free_responses:
+ nvmet_rdma_free_rsps(queue);
+out_ida_remove:
+ ida_simple_remove(&nvmet_rdma_queue_ida, queue->idx);
+out_destroy_sq:
+ nvmet_sq_destroy(&queue->nvme_sq);
+out_free_queue:
+ kfree(queue);
+out_reject:
+ nvmet_rdma_cm_reject(cm_id, ret);
+ return NULL;
+}
+
+static void nvmet_rdma_qp_event(struct ib_event *event, void *priv)
+{
+ struct nvmet_rdma_queue *queue = priv;
+
+ switch (event->event) {
+ case IB_EVENT_COMM_EST:
+ rdma_notify(queue->cm_id, event->event);
+ break;
+ default:
+ pr_err("received IB QP event: %s (%d)\n",
+ ib_event_msg(event->event), event->event);
+ break;
+ }
+}
+
+static int nvmet_rdma_cm_accept(struct rdma_cm_id *cm_id,
+ struct nvmet_rdma_queue *queue,
+ struct rdma_conn_param *p)
+{
+ struct rdma_conn_param param = { };
+ struct nvme_rdma_cm_rep priv = { };
+ int ret = -ENOMEM;
+
+ param.rnr_retry_count = 7;
+ param.flow_control = 1;
+ param.initiator_depth = min_t(u8, p->initiator_depth,
+ queue->dev->device->attrs.max_qp_init_rd_atom);
+ param.private_data = &priv;
+ param.private_data_len = sizeof(priv);
+ priv.recfmt = cpu_to_le16(NVME_RDMA_CM_FMT_1_0);
+ priv.crqsize = cpu_to_le16(queue->recv_queue_size);
+
+ ret = rdma_accept(cm_id, ¶m);
+ if (ret)
+ pr_err("rdma_accept failed (error code = %d)\n", ret);
+
+ return ret;
+}
+
+static int nvmet_rdma_queue_connect(struct rdma_cm_id *cm_id,
+ struct rdma_cm_event *event)
+{
+ struct nvmet_rdma_device *ndev;
+ struct nvmet_rdma_queue *queue;
+ int ret = -EINVAL;
+
+ ndev = nvmet_rdma_find_get_device(cm_id);
+ if (!ndev) {
+ nvmet_rdma_cm_reject(cm_id, NVME_RDMA_CM_NO_RSC);
+ return -ECONNREFUSED;
+ }
+
+ queue = nvmet_rdma_alloc_queue(ndev, cm_id, event);
+ if (!queue) {
+ ret = -ENOMEM;
+ goto put_device;
+ }
+ queue->port = cm_id->context;
+
+ if (queue->host_qid == 0) {
+ /* Let inflight controller teardown complete */
+ flush_scheduled_work();
+ }
+
+ ret = nvmet_rdma_cm_accept(cm_id, queue, &event->param.conn);
+ if (ret)
+ goto release_queue;
+
+ mutex_lock(&nvmet_rdma_queue_mutex);
+ list_add_tail(&queue->queue_list, &nvmet_rdma_queue_list);
+ mutex_unlock(&nvmet_rdma_queue_mutex);
+
+ return 0;
+
+release_queue:
+ nvmet_rdma_free_queue(queue);
+put_device:
+ kref_put(&ndev->ref, nvmet_rdma_free_dev);
+
+ return ret;
+}
+
+static void nvmet_rdma_queue_established(struct nvmet_rdma_queue *queue)
+{
+ unsigned long flags;
+
+ spin_lock_irqsave(&queue->state_lock, flags);
+ if (queue->state != NVMET_RDMA_Q_CONNECTING) {
+ pr_warn("trying to establish a connected queue\n");
+ goto out_unlock;
+ }
+ queue->state = NVMET_RDMA_Q_LIVE;
+
+ while (!list_empty(&queue->rsp_wait_list)) {
+ struct nvmet_rdma_rsp *cmd;
+
+ cmd = list_first_entry(&queue->rsp_wait_list,
+ struct nvmet_rdma_rsp, wait_list);
+ list_del(&cmd->wait_list);
+
+ spin_unlock_irqrestore(&queue->state_lock, flags);
+ nvmet_rdma_handle_command(queue, cmd);
+ spin_lock_irqsave(&queue->state_lock, flags);
+ }
+
+out_unlock:
+ spin_unlock_irqrestore(&queue->state_lock, flags);
+}
+
+static void __nvmet_rdma_queue_disconnect(struct nvmet_rdma_queue *queue)
+{
+ bool disconnect = false;
+ unsigned long flags;
+
+ pr_debug("cm_id= %p queue->state= %d\n", queue->cm_id, queue->state);
+
+ spin_lock_irqsave(&queue->state_lock, flags);
+ switch (queue->state) {
+ case NVMET_RDMA_Q_CONNECTING:
+ case NVMET_RDMA_Q_LIVE:
+ queue->state = NVMET_RDMA_Q_DISCONNECTING;
+ case NVMET_RDMA_IN_DEVICE_REMOVAL:
+ disconnect = true;
+ break;
+ case NVMET_RDMA_Q_DISCONNECTING:
+ break;
+ }
+ spin_unlock_irqrestore(&queue->state_lock, flags);
+
+ if (disconnect) {
+ rdma_disconnect(queue->cm_id);
+ schedule_work(&queue->release_work);
+ }
+}
+
+static void nvmet_rdma_queue_disconnect(struct nvmet_rdma_queue *queue)
+{
+ bool disconnect = false;
+
+ mutex_lock(&nvmet_rdma_queue_mutex);
+ if (!list_empty(&queue->queue_list)) {
+ list_del_init(&queue->queue_list);
+ disconnect = true;
+ }
+ mutex_unlock(&nvmet_rdma_queue_mutex);
+
+ if (disconnect)
+ __nvmet_rdma_queue_disconnect(queue);
+}
+
+static void nvmet_rdma_queue_connect_fail(struct rdma_cm_id *cm_id,
+ struct nvmet_rdma_queue *queue)
+{
+ WARN_ON_ONCE(queue->state != NVMET_RDMA_Q_CONNECTING);
+
+ mutex_lock(&nvmet_rdma_queue_mutex);
+ if (!list_empty(&queue->queue_list))
+ list_del_init(&queue->queue_list);
+ mutex_unlock(&nvmet_rdma_queue_mutex);
+
+ pr_err("failed to connect queue %d\n", queue->idx);
+ schedule_work(&queue->release_work);
+}
+
+/**
+ * nvme_rdma_device_removal() - Handle RDMA device removal
+ * @cm_id: rdma_cm id, used for nvmet port
+ * @queue: nvmet rdma queue (cm id qp_context)
+ *
+ * DEVICE_REMOVAL event notifies us that the RDMA device is about
+ * to unplug. Note that this event can be generated on a normal
+ * queue cm_id and/or a device bound listener cm_id (where in this
+ * case queue will be null).
+ *
+ * We registered an ib_client to handle device removal for queues,
+ * so we only need to handle the listening port cm_ids. In this case
+ * we nullify the priv to prevent double cm_id destruction and destroying
+ * the cm_id implicitely by returning a non-zero rc to the callout.
+ */
+static int nvmet_rdma_device_removal(struct rdma_cm_id *cm_id,
+ struct nvmet_rdma_queue *queue)
+{
+ struct nvmet_port *port;
+
+ if (queue) {
+ /*
+ * This is a queue cm_id. we have registered
+ * an ib_client to handle queues removal
+ * so don't interfear and just return.
+ */
+ return 0;
+ }
+
+ port = cm_id->context;
+
+ /*
+ * This is a listener cm_id. Make sure that
+ * future remove_port won't invoke a double
+ * cm_id destroy. use atomic xchg to make sure
+ * we don't compete with remove_port.
+ */
+ if (xchg(&port->priv, NULL) != cm_id)
+ return 0;
+
+ /*
+ * We need to return 1 so that the core will destroy
+ * it's own ID. What a great API design..
+ */
+ return 1;
+}
+
+static int nvmet_rdma_cm_handler(struct rdma_cm_id *cm_id,
+ struct rdma_cm_event *event)
+{
+ struct nvmet_rdma_queue *queue = NULL;
+ int ret = 0;
+
+ if (cm_id->qp)
+ queue = cm_id->qp->qp_context;
+
+ pr_debug("%s (%d): status %d id %p\n",
+ rdma_event_msg(event->event), event->event,
+ event->status, cm_id);
+
+ switch (event->event) {
+ case RDMA_CM_EVENT_CONNECT_REQUEST:
+ ret = nvmet_rdma_queue_connect(cm_id, event);
+ break;
+ case RDMA_CM_EVENT_ESTABLISHED:
+ nvmet_rdma_queue_established(queue);
+ break;
+ case RDMA_CM_EVENT_ADDR_CHANGE:
+ case RDMA_CM_EVENT_DISCONNECTED:
+ case RDMA_CM_EVENT_TIMEWAIT_EXIT:
+ /*
+ * We might end up here when we already freed the qp
+ * which means queue release sequence is in progress,
+ * so don't get in the way...
+ */
+ if (queue)
+ nvmet_rdma_queue_disconnect(queue);
+ break;
+ case RDMA_CM_EVENT_DEVICE_REMOVAL:
+ ret = nvmet_rdma_device_removal(cm_id, queue);
+ break;
+ case RDMA_CM_EVENT_REJECTED:
+ pr_debug("Connection rejected: %s\n",
+ rdma_reject_msg(cm_id, event->status));
+ /* FALLTHROUGH */
+ case RDMA_CM_EVENT_UNREACHABLE:
+ case RDMA_CM_EVENT_CONNECT_ERROR:
+ nvmet_rdma_queue_connect_fail(cm_id, queue);
+ break;
+ default:
+ pr_err("received unrecognized RDMA CM event %d\n",
+ event->event);
+ break;
+ }
+
+ return ret;
+}
+
+static void nvmet_rdma_delete_ctrl(struct nvmet_ctrl *ctrl)
+{
+ struct nvmet_rdma_queue *queue;
+
+restart:
+ mutex_lock(&nvmet_rdma_queue_mutex);
+ list_for_each_entry(queue, &nvmet_rdma_queue_list, queue_list) {
+ if (queue->nvme_sq.ctrl == ctrl) {
+ list_del_init(&queue->queue_list);
+ mutex_unlock(&nvmet_rdma_queue_mutex);
+
+ __nvmet_rdma_queue_disconnect(queue);
+ goto restart;
+ }
+ }
+ mutex_unlock(&nvmet_rdma_queue_mutex);
+}
+
+static int nvmet_rdma_add_port(struct nvmet_port *port)
+{
+ struct rdma_cm_id *cm_id;
+ struct sockaddr_storage addr = { };
+ __kernel_sa_family_t af;
+ int ret;
+
+ switch (port->disc_addr.adrfam) {
+ case NVMF_ADDR_FAMILY_IP4:
+ af = AF_INET;
+ break;
+ case NVMF_ADDR_FAMILY_IP6:
+ af = AF_INET6;
+ break;
+ default:
+ pr_err("address family %d not supported\n",
+ port->disc_addr.adrfam);
+ return -EINVAL;
+ }
+
+ ret = inet_pton_with_scope(&init_net, af, port->disc_addr.traddr,
+ port->disc_addr.trsvcid, &addr);
+ if (ret) {
+ pr_err("malformed ip/port passed: %s:%s\n",
+ port->disc_addr.traddr, port->disc_addr.trsvcid);
+ return ret;
+ }
+
+ cm_id = rdma_create_id(&init_net, nvmet_rdma_cm_handler, port,
+ RDMA_PS_TCP, IB_QPT_RC);
+ if (IS_ERR(cm_id)) {
+ pr_err("CM ID creation failed\n");
+ return PTR_ERR(cm_id);
+ }
+
+ /*
+ * Allow both IPv4 and IPv6 sockets to bind a single port
+ * at the same time.
+ */
+ ret = rdma_set_afonly(cm_id, 1);
+ if (ret) {
+ pr_err("rdma_set_afonly failed (%d)\n", ret);
+ goto out_destroy_id;
+ }
+
+ ret = rdma_bind_addr(cm_id, (struct sockaddr *)&addr);
+ if (ret) {
+ pr_err("binding CM ID to %pISpcs failed (%d)\n",
+ (struct sockaddr *)&addr, ret);
+ goto out_destroy_id;
+ }
+
+ ret = rdma_listen(cm_id, 128);
+ if (ret) {
+ pr_err("listening to %pISpcs failed (%d)\n",
+ (struct sockaddr *)&addr, ret);
+ goto out_destroy_id;
+ }
+
+ pr_info("enabling port %d (%pISpcs)\n",
+ le16_to_cpu(port->disc_addr.portid), (struct sockaddr *)&addr);
+ port->priv = cm_id;
+ return 0;
+
+out_destroy_id:
+ rdma_destroy_id(cm_id);
+ return ret;
+}
+
+static void nvmet_rdma_remove_port(struct nvmet_port *port)
+{
+ struct rdma_cm_id *cm_id = xchg(&port->priv, NULL);
+
+ if (cm_id)
+ rdma_destroy_id(cm_id);
+}
+
+static struct nvmet_fabrics_ops nvmet_rdma_ops = {
+ .owner = THIS_MODULE,
+ .type = NVMF_TRTYPE_RDMA,
+ .sqe_inline_size = NVMET_RDMA_INLINE_DATA_SIZE,
+ .msdbd = 1,
+ .has_keyed_sgls = 1,
+ .add_port = nvmet_rdma_add_port,
+ .remove_port = nvmet_rdma_remove_port,
+ .queue_response = nvmet_rdma_queue_response,
+ .delete_ctrl = nvmet_rdma_delete_ctrl,
+};
+
+static void nvmet_rdma_remove_one(struct ib_device *ib_device, void *client_data)
+{
+ struct nvmet_rdma_queue *queue, *tmp;
+
+ /* Device is being removed, delete all queues using this device */
+ mutex_lock(&nvmet_rdma_queue_mutex);
+ list_for_each_entry_safe(queue, tmp, &nvmet_rdma_queue_list,
+ queue_list) {
+ if (queue->dev->device != ib_device)
+ continue;
+
+ pr_info("Removing queue %d\n", queue->idx);
+ list_del_init(&queue->queue_list);
+ __nvmet_rdma_queue_disconnect(queue);
+ }
+ mutex_unlock(&nvmet_rdma_queue_mutex);
+
+ flush_scheduled_work();
+}
+
+static struct ib_client nvmet_rdma_ib_client = {
+ .name = "nvmet_rdma",
+ .remove = nvmet_rdma_remove_one
+};
+
+static int __init nvmet_rdma_init(void)
+{
+ int ret;
+
+ ret = ib_register_client(&nvmet_rdma_ib_client);
+ if (ret)
+ return ret;
+
+ ret = nvmet_register_transport(&nvmet_rdma_ops);
+ if (ret)
+ goto err_ib_client;
+
+ return 0;
+
+err_ib_client:
+ ib_unregister_client(&nvmet_rdma_ib_client);
+ return ret;
+}
+
+static void __exit nvmet_rdma_exit(void)
+{
+ struct nvmet_rdma_queue *queue;
+
+ nvmet_unregister_transport(&nvmet_rdma_ops);
+
+ flush_scheduled_work();
+
+ mutex_lock(&nvmet_rdma_queue_mutex);
+ while ((queue = list_first_entry_or_null(&nvmet_rdma_queue_list,
+ struct nvmet_rdma_queue, queue_list))) {
+ list_del_init(&queue->queue_list);
+
+ mutex_unlock(&nvmet_rdma_queue_mutex);
+ __nvmet_rdma_queue_disconnect(queue);
+ mutex_lock(&nvmet_rdma_queue_mutex);
+ }
+ mutex_unlock(&nvmet_rdma_queue_mutex);
+
+ flush_scheduled_work();
+ ib_unregister_client(&nvmet_rdma_ib_client);
+ ida_destroy(&nvmet_rdma_queue_ida);
+}
+
+module_init(nvmet_rdma_init);
+module_exit(nvmet_rdma_exit);
+
+MODULE_LICENSE("GPL v2");
+MODULE_ALIAS("nvmet-transport-1"); /* 1 == NVMF_TRTYPE_RDMA */