zte's code,first commit
Change-Id: I9a04da59e459a9bc0d67f101f700d9d7dc8d681b
diff --git a/ap/os/linux/linux-3.4.x/net/rds/iw_cm.c b/ap/os/linux/linux-3.4.x/net/rds/iw_cm.c
new file mode 100644
index 0000000..a91e1db
--- /dev/null
+++ b/ap/os/linux/linux-3.4.x/net/rds/iw_cm.c
@@ -0,0 +1,765 @@
+/*
+ * Copyright (c) 2006 Oracle. All rights reserved.
+ *
+ * This software is available to you under a choice of one of two
+ * licenses. You may choose to be licensed under the terms of the GNU
+ * General Public License (GPL) Version 2, available from the file
+ * COPYING in the main directory of this source tree, or the
+ * OpenIB.org BSD license below:
+ *
+ * Redistribution and use in source and binary forms, with or
+ * without modification, are permitted provided that the following
+ * conditions are met:
+ *
+ * - Redistributions of source code must retain the above
+ * copyright notice, this list of conditions and the following
+ * disclaimer.
+ *
+ * - Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following
+ * disclaimer in the documentation and/or other materials
+ * provided with the distribution.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+ * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ *
+ */
+#include <linux/kernel.h>
+#include <linux/in.h>
+#include <linux/slab.h>
+#include <linux/vmalloc.h>
+#include <linux/ratelimit.h>
+
+#include "rds.h"
+#include "iw.h"
+
+/*
+ * Set the selected protocol version
+ */
+static void rds_iw_set_protocol(struct rds_connection *conn, unsigned int version)
+{
+ conn->c_version = version;
+}
+
+/*
+ * Set up flow control
+ */
+static void rds_iw_set_flow_control(struct rds_connection *conn, u32 credits)
+{
+ struct rds_iw_connection *ic = conn->c_transport_data;
+
+ if (rds_iw_sysctl_flow_control && credits != 0) {
+ /* We're doing flow control */
+ ic->i_flowctl = 1;
+ rds_iw_send_add_credits(conn, credits);
+ } else {
+ ic->i_flowctl = 0;
+ }
+}
+
+/*
+ * Connection established.
+ * We get here for both outgoing and incoming connection.
+ */
+void rds_iw_cm_connect_complete(struct rds_connection *conn, struct rdma_cm_event *event)
+{
+ const struct rds_iw_connect_private *dp = NULL;
+ struct rds_iw_connection *ic = conn->c_transport_data;
+ struct rds_iw_device *rds_iwdev;
+ int err;
+
+ if (event->param.conn.private_data_len) {
+ dp = event->param.conn.private_data;
+
+ rds_iw_set_protocol(conn,
+ RDS_PROTOCOL(dp->dp_protocol_major,
+ dp->dp_protocol_minor));
+ rds_iw_set_flow_control(conn, be32_to_cpu(dp->dp_credit));
+ }
+
+ /* update ib_device with this local ipaddr & conn */
+ rds_iwdev = ib_get_client_data(ic->i_cm_id->device, &rds_iw_client);
+ err = rds_iw_update_cm_id(rds_iwdev, ic->i_cm_id);
+ if (err)
+ printk(KERN_ERR "rds_iw_update_ipaddr failed (%d)\n", err);
+ rds_iw_add_conn(rds_iwdev, conn);
+
+ /* If the peer gave us the last packet it saw, process this as if
+ * we had received a regular ACK. */
+ if (dp && dp->dp_ack_seq)
+ rds_send_drop_acked(conn, be64_to_cpu(dp->dp_ack_seq), NULL);
+
+ printk(KERN_NOTICE "RDS/IW: connected to %pI4<->%pI4 version %u.%u%s\n",
+ &conn->c_laddr, &conn->c_faddr,
+ RDS_PROTOCOL_MAJOR(conn->c_version),
+ RDS_PROTOCOL_MINOR(conn->c_version),
+ ic->i_flowctl ? ", flow control" : "");
+
+ rds_connect_complete(conn);
+}
+
+static void rds_iw_cm_fill_conn_param(struct rds_connection *conn,
+ struct rdma_conn_param *conn_param,
+ struct rds_iw_connect_private *dp,
+ u32 protocol_version)
+{
+ struct rds_iw_connection *ic = conn->c_transport_data;
+
+ memset(conn_param, 0, sizeof(struct rdma_conn_param));
+ /* XXX tune these? */
+ conn_param->responder_resources = 1;
+ conn_param->initiator_depth = 1;
+
+ if (dp) {
+ memset(dp, 0, sizeof(*dp));
+ dp->dp_saddr = conn->c_laddr;
+ dp->dp_daddr = conn->c_faddr;
+ dp->dp_protocol_major = RDS_PROTOCOL_MAJOR(protocol_version);
+ dp->dp_protocol_minor = RDS_PROTOCOL_MINOR(protocol_version);
+ dp->dp_protocol_minor_mask = cpu_to_be16(RDS_IW_SUPPORTED_PROTOCOLS);
+ dp->dp_ack_seq = rds_iw_piggyb_ack(ic);
+
+ /* Advertise flow control */
+ if (ic->i_flowctl) {
+ unsigned int credits;
+
+ credits = IB_GET_POST_CREDITS(atomic_read(&ic->i_credits));
+ dp->dp_credit = cpu_to_be32(credits);
+ atomic_sub(IB_SET_POST_CREDITS(credits), &ic->i_credits);
+ }
+
+ conn_param->private_data = dp;
+ conn_param->private_data_len = sizeof(*dp);
+ }
+}
+
+static void rds_iw_cq_event_handler(struct ib_event *event, void *data)
+{
+ rdsdebug("event %u data %p\n", event->event, data);
+}
+
+static void rds_iw_qp_event_handler(struct ib_event *event, void *data)
+{
+ struct rds_connection *conn = data;
+ struct rds_iw_connection *ic = conn->c_transport_data;
+
+ rdsdebug("conn %p ic %p event %u\n", conn, ic, event->event);
+
+ switch (event->event) {
+ case IB_EVENT_COMM_EST:
+ rdma_notify(ic->i_cm_id, IB_EVENT_COMM_EST);
+ break;
+ case IB_EVENT_QP_REQ_ERR:
+ case IB_EVENT_QP_FATAL:
+ default:
+ rdsdebug("Fatal QP Event %u "
+ "- connection %pI4->%pI4, reconnecting\n",
+ event->event, &conn->c_laddr,
+ &conn->c_faddr);
+ rds_conn_drop(conn);
+ break;
+ }
+}
+
+/*
+ * Create a QP
+ */
+static int rds_iw_init_qp_attrs(struct ib_qp_init_attr *attr,
+ struct rds_iw_device *rds_iwdev,
+ struct rds_iw_work_ring *send_ring,
+ void (*send_cq_handler)(struct ib_cq *, void *),
+ struct rds_iw_work_ring *recv_ring,
+ void (*recv_cq_handler)(struct ib_cq *, void *),
+ void *context)
+{
+ struct ib_device *dev = rds_iwdev->dev;
+ unsigned int send_size, recv_size;
+ int ret;
+
+ /* The offset of 1 is to accommodate the additional ACK WR. */
+ send_size = min_t(unsigned int, rds_iwdev->max_wrs, rds_iw_sysctl_max_send_wr + 1);
+ recv_size = min_t(unsigned int, rds_iwdev->max_wrs, rds_iw_sysctl_max_recv_wr + 1);
+ rds_iw_ring_resize(send_ring, send_size - 1);
+ rds_iw_ring_resize(recv_ring, recv_size - 1);
+
+ memset(attr, 0, sizeof(*attr));
+ attr->event_handler = rds_iw_qp_event_handler;
+ attr->qp_context = context;
+ attr->cap.max_send_wr = send_size;
+ attr->cap.max_recv_wr = recv_size;
+ attr->cap.max_send_sge = rds_iwdev->max_sge;
+ attr->cap.max_recv_sge = RDS_IW_RECV_SGE;
+ attr->sq_sig_type = IB_SIGNAL_REQ_WR;
+ attr->qp_type = IB_QPT_RC;
+
+ attr->send_cq = ib_create_cq(dev, send_cq_handler,
+ rds_iw_cq_event_handler,
+ context, send_size, 0);
+ if (IS_ERR(attr->send_cq)) {
+ ret = PTR_ERR(attr->send_cq);
+ attr->send_cq = NULL;
+ rdsdebug("ib_create_cq send failed: %d\n", ret);
+ goto out;
+ }
+
+ attr->recv_cq = ib_create_cq(dev, recv_cq_handler,
+ rds_iw_cq_event_handler,
+ context, recv_size, 0);
+ if (IS_ERR(attr->recv_cq)) {
+ ret = PTR_ERR(attr->recv_cq);
+ attr->recv_cq = NULL;
+ rdsdebug("ib_create_cq send failed: %d\n", ret);
+ goto out;
+ }
+
+ ret = ib_req_notify_cq(attr->send_cq, IB_CQ_NEXT_COMP);
+ if (ret) {
+ rdsdebug("ib_req_notify_cq send failed: %d\n", ret);
+ goto out;
+ }
+
+ ret = ib_req_notify_cq(attr->recv_cq, IB_CQ_SOLICITED);
+ if (ret) {
+ rdsdebug("ib_req_notify_cq recv failed: %d\n", ret);
+ goto out;
+ }
+
+out:
+ if (ret) {
+ if (attr->send_cq)
+ ib_destroy_cq(attr->send_cq);
+ if (attr->recv_cq)
+ ib_destroy_cq(attr->recv_cq);
+ }
+ return ret;
+}
+
+/*
+ * This needs to be very careful to not leave IS_ERR pointers around for
+ * cleanup to trip over.
+ */
+static int rds_iw_setup_qp(struct rds_connection *conn)
+{
+ struct rds_iw_connection *ic = conn->c_transport_data;
+ struct ib_device *dev = ic->i_cm_id->device;
+ struct ib_qp_init_attr attr;
+ struct rds_iw_device *rds_iwdev;
+ int ret;
+
+ /* rds_iw_add_one creates a rds_iw_device object per IB device,
+ * and allocates a protection domain, memory range and MR pool
+ * for each. If that fails for any reason, it will not register
+ * the rds_iwdev at all.
+ */
+ rds_iwdev = ib_get_client_data(dev, &rds_iw_client);
+ if (!rds_iwdev) {
+ printk_ratelimited(KERN_NOTICE "RDS/IW: No client_data for device %s\n",
+ dev->name);
+ return -EOPNOTSUPP;
+ }
+
+ /* Protection domain and memory range */
+ ic->i_pd = rds_iwdev->pd;
+ ic->i_mr = rds_iwdev->mr;
+
+ ret = rds_iw_init_qp_attrs(&attr, rds_iwdev,
+ &ic->i_send_ring, rds_iw_send_cq_comp_handler,
+ &ic->i_recv_ring, rds_iw_recv_cq_comp_handler,
+ conn);
+ if (ret < 0)
+ goto out;
+
+ ic->i_send_cq = attr.send_cq;
+ ic->i_recv_cq = attr.recv_cq;
+
+ /*
+ * XXX this can fail if max_*_wr is too large? Are we supposed
+ * to back off until we get a value that the hardware can support?
+ */
+ ret = rdma_create_qp(ic->i_cm_id, ic->i_pd, &attr);
+ if (ret) {
+ rdsdebug("rdma_create_qp failed: %d\n", ret);
+ goto out;
+ }
+
+ ic->i_send_hdrs = ib_dma_alloc_coherent(dev,
+ ic->i_send_ring.w_nr *
+ sizeof(struct rds_header),
+ &ic->i_send_hdrs_dma, GFP_KERNEL);
+ if (!ic->i_send_hdrs) {
+ ret = -ENOMEM;
+ rdsdebug("ib_dma_alloc_coherent send failed\n");
+ goto out;
+ }
+
+ ic->i_recv_hdrs = ib_dma_alloc_coherent(dev,
+ ic->i_recv_ring.w_nr *
+ sizeof(struct rds_header),
+ &ic->i_recv_hdrs_dma, GFP_KERNEL);
+ if (!ic->i_recv_hdrs) {
+ ret = -ENOMEM;
+ rdsdebug("ib_dma_alloc_coherent recv failed\n");
+ goto out;
+ }
+
+ ic->i_ack = ib_dma_alloc_coherent(dev, sizeof(struct rds_header),
+ &ic->i_ack_dma, GFP_KERNEL);
+ if (!ic->i_ack) {
+ ret = -ENOMEM;
+ rdsdebug("ib_dma_alloc_coherent ack failed\n");
+ goto out;
+ }
+
+ ic->i_sends = vmalloc(ic->i_send_ring.w_nr * sizeof(struct rds_iw_send_work));
+ if (!ic->i_sends) {
+ ret = -ENOMEM;
+ rdsdebug("send allocation failed\n");
+ goto out;
+ }
+ rds_iw_send_init_ring(ic);
+
+ ic->i_recvs = vmalloc(ic->i_recv_ring.w_nr * sizeof(struct rds_iw_recv_work));
+ if (!ic->i_recvs) {
+ ret = -ENOMEM;
+ rdsdebug("recv allocation failed\n");
+ goto out;
+ }
+
+ rds_iw_recv_init_ring(ic);
+ rds_iw_recv_init_ack(ic);
+
+ /* Post receive buffers - as a side effect, this will update
+ * the posted credit count. */
+ rds_iw_recv_refill(conn, GFP_KERNEL, GFP_HIGHUSER, 1);
+
+ rdsdebug("conn %p pd %p mr %p cq %p %p\n", conn, ic->i_pd, ic->i_mr,
+ ic->i_send_cq, ic->i_recv_cq);
+
+out:
+ return ret;
+}
+
+static u32 rds_iw_protocol_compatible(const struct rds_iw_connect_private *dp)
+{
+ u16 common;
+ u32 version = 0;
+
+ /* rdma_cm private data is odd - when there is any private data in the
+ * request, we will be given a pretty large buffer without telling us the
+ * original size. The only way to tell the difference is by looking at
+ * the contents, which are initialized to zero.
+ * If the protocol version fields aren't set, this is a connection attempt
+ * from an older version. This could could be 3.0 or 2.0 - we can't tell.
+ * We really should have changed this for OFED 1.3 :-( */
+ if (dp->dp_protocol_major == 0)
+ return RDS_PROTOCOL_3_0;
+
+ common = be16_to_cpu(dp->dp_protocol_minor_mask) & RDS_IW_SUPPORTED_PROTOCOLS;
+ if (dp->dp_protocol_major == 3 && common) {
+ version = RDS_PROTOCOL_3_0;
+ while ((common >>= 1) != 0)
+ version++;
+ }
+ printk_ratelimited(KERN_NOTICE "RDS: Connection from %pI4 using "
+ "incompatible protocol version %u.%u\n",
+ &dp->dp_saddr,
+ dp->dp_protocol_major,
+ dp->dp_protocol_minor);
+ return version;
+}
+
+int rds_iw_cm_handle_connect(struct rdma_cm_id *cm_id,
+ struct rdma_cm_event *event)
+{
+ const struct rds_iw_connect_private *dp = event->param.conn.private_data;
+ struct rds_iw_connect_private dp_rep;
+ struct rds_connection *conn = NULL;
+ struct rds_iw_connection *ic = NULL;
+ struct rdma_conn_param conn_param;
+ struct rds_iw_device *rds_iwdev;
+ u32 version;
+ int err, destroy = 1;
+
+ /* Check whether the remote protocol version matches ours. */
+ version = rds_iw_protocol_compatible(dp);
+ if (!version)
+ goto out;
+
+ rdsdebug("saddr %pI4 daddr %pI4 RDSv%u.%u\n",
+ &dp->dp_saddr, &dp->dp_daddr,
+ RDS_PROTOCOL_MAJOR(version), RDS_PROTOCOL_MINOR(version));
+
+ conn = rds_conn_create(dp->dp_daddr, dp->dp_saddr, &rds_iw_transport,
+ GFP_KERNEL);
+ if (IS_ERR(conn)) {
+ rdsdebug("rds_conn_create failed (%ld)\n", PTR_ERR(conn));
+ conn = NULL;
+ goto out;
+ }
+
+ /*
+ * The connection request may occur while the
+ * previous connection exist, e.g. in case of failover.
+ * But as connections may be initiated simultaneously
+ * by both hosts, we have a random backoff mechanism -
+ * see the comment above rds_queue_reconnect()
+ */
+ mutex_lock(&conn->c_cm_lock);
+ if (!rds_conn_transition(conn, RDS_CONN_DOWN, RDS_CONN_CONNECTING)) {
+ if (rds_conn_state(conn) == RDS_CONN_UP) {
+ rdsdebug("incoming connect while connecting\n");
+ rds_conn_drop(conn);
+ rds_iw_stats_inc(s_iw_listen_closed_stale);
+ } else
+ if (rds_conn_state(conn) == RDS_CONN_CONNECTING) {
+ /* Wait and see - our connect may still be succeeding */
+ rds_iw_stats_inc(s_iw_connect_raced);
+ }
+ mutex_unlock(&conn->c_cm_lock);
+ goto out;
+ }
+
+ ic = conn->c_transport_data;
+
+ rds_iw_set_protocol(conn, version);
+ rds_iw_set_flow_control(conn, be32_to_cpu(dp->dp_credit));
+
+ /* If the peer gave us the last packet it saw, process this as if
+ * we had received a regular ACK. */
+ if (dp->dp_ack_seq)
+ rds_send_drop_acked(conn, be64_to_cpu(dp->dp_ack_seq), NULL);
+
+ BUG_ON(cm_id->context);
+ BUG_ON(ic->i_cm_id);
+
+ ic->i_cm_id = cm_id;
+ cm_id->context = conn;
+
+ rds_iwdev = ib_get_client_data(cm_id->device, &rds_iw_client);
+ ic->i_dma_local_lkey = rds_iwdev->dma_local_lkey;
+
+ /* We got halfway through setting up the ib_connection, if we
+ * fail now, we have to take the long route out of this mess. */
+ destroy = 0;
+
+ err = rds_iw_setup_qp(conn);
+ if (err) {
+ rds_iw_conn_error(conn, "rds_iw_setup_qp failed (%d)\n", err);
+ mutex_unlock(&conn->c_cm_lock);
+ goto out;
+ }
+
+ rds_iw_cm_fill_conn_param(conn, &conn_param, &dp_rep, version);
+
+ /* rdma_accept() calls rdma_reject() internally if it fails */
+ err = rdma_accept(cm_id, &conn_param);
+ mutex_unlock(&conn->c_cm_lock);
+ if (err) {
+ rds_iw_conn_error(conn, "rdma_accept failed (%d)\n", err);
+ goto out;
+ }
+
+ return 0;
+
+out:
+ rdma_reject(cm_id, NULL, 0);
+ return destroy;
+}
+
+
+int rds_iw_cm_initiate_connect(struct rdma_cm_id *cm_id)
+{
+ struct rds_connection *conn = cm_id->context;
+ struct rds_iw_connection *ic = conn->c_transport_data;
+ struct rdma_conn_param conn_param;
+ struct rds_iw_connect_private dp;
+ int ret;
+
+ /* If the peer doesn't do protocol negotiation, we must
+ * default to RDSv3.0 */
+ rds_iw_set_protocol(conn, RDS_PROTOCOL_3_0);
+ ic->i_flowctl = rds_iw_sysctl_flow_control; /* advertise flow control */
+
+ ret = rds_iw_setup_qp(conn);
+ if (ret) {
+ rds_iw_conn_error(conn, "rds_iw_setup_qp failed (%d)\n", ret);
+ goto out;
+ }
+
+ rds_iw_cm_fill_conn_param(conn, &conn_param, &dp, RDS_PROTOCOL_VERSION);
+
+ ret = rdma_connect(cm_id, &conn_param);
+ if (ret)
+ rds_iw_conn_error(conn, "rdma_connect failed (%d)\n", ret);
+
+out:
+ /* Beware - returning non-zero tells the rdma_cm to destroy
+ * the cm_id. We should certainly not do it as long as we still
+ * "own" the cm_id. */
+ if (ret) {
+ struct rds_iw_connection *ic = conn->c_transport_data;
+
+ if (ic->i_cm_id == cm_id)
+ ret = 0;
+ }
+ return ret;
+}
+
+int rds_iw_conn_connect(struct rds_connection *conn)
+{
+ struct rds_iw_connection *ic = conn->c_transport_data;
+ struct rds_iw_device *rds_iwdev;
+ struct sockaddr_in src, dest;
+ int ret;
+
+ /* XXX I wonder what affect the port space has */
+ /* delegate cm event handler to rdma_transport */
+ ic->i_cm_id = rdma_create_id(rds_rdma_cm_event_handler, conn,
+ RDMA_PS_TCP, IB_QPT_RC);
+ if (IS_ERR(ic->i_cm_id)) {
+ ret = PTR_ERR(ic->i_cm_id);
+ ic->i_cm_id = NULL;
+ rdsdebug("rdma_create_id() failed: %d\n", ret);
+ goto out;
+ }
+
+ rdsdebug("created cm id %p for conn %p\n", ic->i_cm_id, conn);
+
+ src.sin_family = AF_INET;
+ src.sin_addr.s_addr = (__force u32)conn->c_laddr;
+ src.sin_port = (__force u16)htons(0);
+
+ /* First, bind to the local address and device. */
+ ret = rdma_bind_addr(ic->i_cm_id, (struct sockaddr *) &src);
+ if (ret) {
+ rdsdebug("rdma_bind_addr(%pI4) failed: %d\n",
+ &conn->c_laddr, ret);
+ rdma_destroy_id(ic->i_cm_id);
+ ic->i_cm_id = NULL;
+ goto out;
+ }
+
+ rds_iwdev = ib_get_client_data(ic->i_cm_id->device, &rds_iw_client);
+ ic->i_dma_local_lkey = rds_iwdev->dma_local_lkey;
+
+ dest.sin_family = AF_INET;
+ dest.sin_addr.s_addr = (__force u32)conn->c_faddr;
+ dest.sin_port = (__force u16)htons(RDS_PORT);
+
+ ret = rdma_resolve_addr(ic->i_cm_id, (struct sockaddr *)&src,
+ (struct sockaddr *)&dest,
+ RDS_RDMA_RESOLVE_TIMEOUT_MS);
+ if (ret) {
+ rdsdebug("addr resolve failed for cm id %p: %d\n", ic->i_cm_id,
+ ret);
+ rdma_destroy_id(ic->i_cm_id);
+ ic->i_cm_id = NULL;
+ }
+
+out:
+ return ret;
+}
+
+/*
+ * This is so careful about only cleaning up resources that were built up
+ * so that it can be called at any point during startup. In fact it
+ * can be called multiple times for a given connection.
+ */
+void rds_iw_conn_shutdown(struct rds_connection *conn)
+{
+ struct rds_iw_connection *ic = conn->c_transport_data;
+ int err = 0;
+ struct ib_qp_attr qp_attr;
+
+ rdsdebug("cm %p pd %p cq %p %p qp %p\n", ic->i_cm_id,
+ ic->i_pd, ic->i_send_cq, ic->i_recv_cq,
+ ic->i_cm_id ? ic->i_cm_id->qp : NULL);
+
+ if (ic->i_cm_id) {
+ struct ib_device *dev = ic->i_cm_id->device;
+
+ rdsdebug("disconnecting cm %p\n", ic->i_cm_id);
+ err = rdma_disconnect(ic->i_cm_id);
+ if (err) {
+ /* Actually this may happen quite frequently, when
+ * an outgoing connect raced with an incoming connect.
+ */
+ rdsdebug("rds_iw_conn_shutdown: failed to disconnect,"
+ " cm: %p err %d\n", ic->i_cm_id, err);
+ }
+
+ if (ic->i_cm_id->qp) {
+ qp_attr.qp_state = IB_QPS_ERR;
+ ib_modify_qp(ic->i_cm_id->qp, &qp_attr, IB_QP_STATE);
+ }
+
+ wait_event(rds_iw_ring_empty_wait,
+ rds_iw_ring_empty(&ic->i_send_ring) &&
+ rds_iw_ring_empty(&ic->i_recv_ring));
+
+ if (ic->i_send_hdrs)
+ ib_dma_free_coherent(dev,
+ ic->i_send_ring.w_nr *
+ sizeof(struct rds_header),
+ ic->i_send_hdrs,
+ ic->i_send_hdrs_dma);
+
+ if (ic->i_recv_hdrs)
+ ib_dma_free_coherent(dev,
+ ic->i_recv_ring.w_nr *
+ sizeof(struct rds_header),
+ ic->i_recv_hdrs,
+ ic->i_recv_hdrs_dma);
+
+ if (ic->i_ack)
+ ib_dma_free_coherent(dev, sizeof(struct rds_header),
+ ic->i_ack, ic->i_ack_dma);
+
+ if (ic->i_sends)
+ rds_iw_send_clear_ring(ic);
+ if (ic->i_recvs)
+ rds_iw_recv_clear_ring(ic);
+
+ if (ic->i_cm_id->qp)
+ rdma_destroy_qp(ic->i_cm_id);
+ if (ic->i_send_cq)
+ ib_destroy_cq(ic->i_send_cq);
+ if (ic->i_recv_cq)
+ ib_destroy_cq(ic->i_recv_cq);
+
+ /*
+ * If associated with an rds_iw_device:
+ * Move connection back to the nodev list.
+ * Remove cm_id from the device cm_id list.
+ */
+ if (ic->rds_iwdev)
+ rds_iw_remove_conn(ic->rds_iwdev, conn);
+
+ rdma_destroy_id(ic->i_cm_id);
+
+ ic->i_cm_id = NULL;
+ ic->i_pd = NULL;
+ ic->i_mr = NULL;
+ ic->i_send_cq = NULL;
+ ic->i_recv_cq = NULL;
+ ic->i_send_hdrs = NULL;
+ ic->i_recv_hdrs = NULL;
+ ic->i_ack = NULL;
+ }
+ BUG_ON(ic->rds_iwdev);
+
+ /* Clear pending transmit */
+ if (ic->i_rm) {
+ rds_message_put(ic->i_rm);
+ ic->i_rm = NULL;
+ }
+
+ /* Clear the ACK state */
+ clear_bit(IB_ACK_IN_FLIGHT, &ic->i_ack_flags);
+#ifdef KERNEL_HAS_ATOMIC64
+ atomic64_set(&ic->i_ack_next, 0);
+#else
+ ic->i_ack_next = 0;
+#endif
+ ic->i_ack_recv = 0;
+
+ /* Clear flow control state */
+ ic->i_flowctl = 0;
+ atomic_set(&ic->i_credits, 0);
+
+ rds_iw_ring_init(&ic->i_send_ring, rds_iw_sysctl_max_send_wr);
+ rds_iw_ring_init(&ic->i_recv_ring, rds_iw_sysctl_max_recv_wr);
+
+ if (ic->i_iwinc) {
+ rds_inc_put(&ic->i_iwinc->ii_inc);
+ ic->i_iwinc = NULL;
+ }
+
+ vfree(ic->i_sends);
+ ic->i_sends = NULL;
+ vfree(ic->i_recvs);
+ ic->i_recvs = NULL;
+ rdsdebug("shutdown complete\n");
+}
+
+int rds_iw_conn_alloc(struct rds_connection *conn, gfp_t gfp)
+{
+ struct rds_iw_connection *ic;
+ unsigned long flags;
+
+ /* XXX too lazy? */
+ ic = kzalloc(sizeof(struct rds_iw_connection), gfp);
+ if (!ic)
+ return -ENOMEM;
+
+ INIT_LIST_HEAD(&ic->iw_node);
+ tasklet_init(&ic->i_recv_tasklet, rds_iw_recv_tasklet_fn,
+ (unsigned long) ic);
+ mutex_init(&ic->i_recv_mutex);
+#ifndef KERNEL_HAS_ATOMIC64
+ spin_lock_init(&ic->i_ack_lock);
+#endif
+
+ /*
+ * rds_iw_conn_shutdown() waits for these to be emptied so they
+ * must be initialized before it can be called.
+ */
+ rds_iw_ring_init(&ic->i_send_ring, rds_iw_sysctl_max_send_wr);
+ rds_iw_ring_init(&ic->i_recv_ring, rds_iw_sysctl_max_recv_wr);
+
+ ic->conn = conn;
+ conn->c_transport_data = ic;
+
+ spin_lock_irqsave(&iw_nodev_conns_lock, flags);
+ list_add_tail(&ic->iw_node, &iw_nodev_conns);
+ spin_unlock_irqrestore(&iw_nodev_conns_lock, flags);
+
+
+ rdsdebug("conn %p conn ic %p\n", conn, conn->c_transport_data);
+ return 0;
+}
+
+/*
+ * Free a connection. Connection must be shut down and not set for reconnect.
+ */
+void rds_iw_conn_free(void *arg)
+{
+ struct rds_iw_connection *ic = arg;
+ spinlock_t *lock_ptr;
+
+ rdsdebug("ic %p\n", ic);
+
+ /*
+ * Conn is either on a dev's list or on the nodev list.
+ * A race with shutdown() or connect() would cause problems
+ * (since rds_iwdev would change) but that should never happen.
+ */
+ lock_ptr = ic->rds_iwdev ? &ic->rds_iwdev->spinlock : &iw_nodev_conns_lock;
+
+ spin_lock_irq(lock_ptr);
+ list_del(&ic->iw_node);
+ spin_unlock_irq(lock_ptr);
+
+ kfree(ic);
+}
+
+/*
+ * An error occurred on the connection
+ */
+void
+__rds_iw_conn_error(struct rds_connection *conn, const char *fmt, ...)
+{
+ va_list ap;
+
+ rds_conn_drop(conn);
+
+ va_start(ap, fmt);
+ vprintk(fmt, ap);
+ va_end(ap);
+}