ASR_BASE
Change-Id: Icf3719cc0afe3eeb3edc7fa80a2eb5199ca9dda1
diff --git a/marvell/linux/drivers/target/iscsi/iscsi_target_util.c b/marvell/linux/drivers/target/iscsi/iscsi_target_util.c
new file mode 100644
index 0000000..89183b3
--- /dev/null
+++ b/marvell/linux/drivers/target/iscsi/iscsi_target_util.c
@@ -0,0 +1,1405 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*******************************************************************************
+ * This file contains the iSCSI Target specific utility functions.
+ *
+ * (c) Copyright 2007-2013 Datera, Inc.
+ *
+ * Author: Nicholas A. Bellinger <nab@linux-iscsi.org>
+ *
+ ******************************************************************************/
+
+#include <linux/list.h>
+#include <linux/sched/signal.h>
+#include <net/ipv6.h> /* ipv6_addr_equal() */
+#include <scsi/scsi_tcq.h>
+#include <scsi/iscsi_proto.h>
+#include <target/target_core_base.h>
+#include <target/target_core_fabric.h>
+#include <target/iscsi/iscsi_transport.h>
+
+#include <target/iscsi/iscsi_target_core.h>
+#include "iscsi_target_parameters.h"
+#include "iscsi_target_seq_pdu_list.h"
+#include "iscsi_target_datain_values.h"
+#include "iscsi_target_erl0.h"
+#include "iscsi_target_erl1.h"
+#include "iscsi_target_erl2.h"
+#include "iscsi_target_tpg.h"
+#include "iscsi_target_util.h"
+#include "iscsi_target.h"
+
+#define PRINT_BUFF(buff, len) \
+{ \
+ int zzz; \
+ \
+ pr_debug("%d:\n", __LINE__); \
+ for (zzz = 0; zzz < len; zzz++) { \
+ if (zzz % 16 == 0) { \
+ if (zzz) \
+ pr_debug("\n"); \
+ pr_debug("%4i: ", zzz); \
+ } \
+ pr_debug("%02x ", (unsigned char) (buff)[zzz]); \
+ } \
+ if ((len + 1) % 16) \
+ pr_debug("\n"); \
+}
+
+extern struct list_head g_tiqn_list;
+extern spinlock_t tiqn_lock;
+
+int iscsit_add_r2t_to_list(
+ struct iscsi_cmd *cmd,
+ u32 offset,
+ u32 xfer_len,
+ int recovery,
+ u32 r2t_sn)
+{
+ struct iscsi_r2t *r2t;
+
+ lockdep_assert_held(&cmd->r2t_lock);
+
+ WARN_ON_ONCE((s32)xfer_len < 0);
+
+ r2t = kmem_cache_zalloc(lio_r2t_cache, GFP_ATOMIC);
+ if (!r2t) {
+ pr_err("Unable to allocate memory for struct iscsi_r2t.\n");
+ return -1;
+ }
+ INIT_LIST_HEAD(&r2t->r2t_list);
+
+ r2t->recovery_r2t = recovery;
+ r2t->r2t_sn = (!r2t_sn) ? cmd->r2t_sn++ : r2t_sn;
+ r2t->offset = offset;
+ r2t->xfer_len = xfer_len;
+ list_add_tail(&r2t->r2t_list, &cmd->cmd_r2t_list);
+ spin_unlock_bh(&cmd->r2t_lock);
+
+ iscsit_add_cmd_to_immediate_queue(cmd, cmd->conn, ISTATE_SEND_R2T);
+
+ spin_lock_bh(&cmd->r2t_lock);
+ return 0;
+}
+
+struct iscsi_r2t *iscsit_get_r2t_for_eos(
+ struct iscsi_cmd *cmd,
+ u32 offset,
+ u32 length)
+{
+ struct iscsi_r2t *r2t;
+
+ spin_lock_bh(&cmd->r2t_lock);
+ list_for_each_entry(r2t, &cmd->cmd_r2t_list, r2t_list) {
+ if ((r2t->offset <= offset) &&
+ (r2t->offset + r2t->xfer_len) >= (offset + length)) {
+ spin_unlock_bh(&cmd->r2t_lock);
+ return r2t;
+ }
+ }
+ spin_unlock_bh(&cmd->r2t_lock);
+
+ pr_err("Unable to locate R2T for Offset: %u, Length:"
+ " %u\n", offset, length);
+ return NULL;
+}
+
+struct iscsi_r2t *iscsit_get_r2t_from_list(struct iscsi_cmd *cmd)
+{
+ struct iscsi_r2t *r2t;
+
+ spin_lock_bh(&cmd->r2t_lock);
+ list_for_each_entry(r2t, &cmd->cmd_r2t_list, r2t_list) {
+ if (!r2t->sent_r2t) {
+ spin_unlock_bh(&cmd->r2t_lock);
+ return r2t;
+ }
+ }
+ spin_unlock_bh(&cmd->r2t_lock);
+
+ pr_err("Unable to locate next R2T to send for ITT:"
+ " 0x%08x.\n", cmd->init_task_tag);
+ return NULL;
+}
+
+void iscsit_free_r2t(struct iscsi_r2t *r2t, struct iscsi_cmd *cmd)
+{
+ lockdep_assert_held(&cmd->r2t_lock);
+
+ list_del(&r2t->r2t_list);
+ kmem_cache_free(lio_r2t_cache, r2t);
+}
+
+void iscsit_free_r2ts_from_list(struct iscsi_cmd *cmd)
+{
+ struct iscsi_r2t *r2t, *r2t_tmp;
+
+ spin_lock_bh(&cmd->r2t_lock);
+ list_for_each_entry_safe(r2t, r2t_tmp, &cmd->cmd_r2t_list, r2t_list)
+ iscsit_free_r2t(r2t, cmd);
+ spin_unlock_bh(&cmd->r2t_lock);
+}
+
+static int iscsit_wait_for_tag(struct se_session *se_sess, int state, int *cpup)
+{
+ int tag = -1;
+ DEFINE_SBQ_WAIT(wait);
+ struct sbq_wait_state *ws;
+ struct sbitmap_queue *sbq;
+
+ if (state == TASK_RUNNING)
+ return tag;
+
+ sbq = &se_sess->sess_tag_pool;
+ ws = &sbq->ws[0];
+ for (;;) {
+ sbitmap_prepare_to_wait(sbq, ws, &wait, state);
+ if (signal_pending_state(state, current))
+ break;
+ tag = sbitmap_queue_get(sbq, cpup);
+ if (tag >= 0)
+ break;
+ schedule();
+ }
+
+ sbitmap_finish_wait(sbq, ws, &wait);
+ return tag;
+}
+
+/*
+ * May be called from software interrupt (timer) context for allocating
+ * iSCSI NopINs.
+ */
+struct iscsi_cmd *iscsit_allocate_cmd(struct iscsi_conn *conn, int state)
+{
+ struct iscsi_cmd *cmd;
+ struct se_session *se_sess = conn->sess->se_sess;
+ int size, tag, cpu;
+
+ tag = sbitmap_queue_get(&se_sess->sess_tag_pool, &cpu);
+ if (tag < 0)
+ tag = iscsit_wait_for_tag(se_sess, state, &cpu);
+ if (tag < 0)
+ return NULL;
+
+ size = sizeof(struct iscsi_cmd) + conn->conn_transport->priv_size;
+ cmd = (struct iscsi_cmd *)(se_sess->sess_cmd_map + (tag * size));
+ memset(cmd, 0, size);
+
+ cmd->se_cmd.map_tag = tag;
+ cmd->se_cmd.map_cpu = cpu;
+ cmd->conn = conn;
+ cmd->data_direction = DMA_NONE;
+ INIT_LIST_HEAD(&cmd->i_conn_node);
+ INIT_LIST_HEAD(&cmd->datain_list);
+ INIT_LIST_HEAD(&cmd->cmd_r2t_list);
+ spin_lock_init(&cmd->datain_lock);
+ spin_lock_init(&cmd->dataout_timeout_lock);
+ spin_lock_init(&cmd->istate_lock);
+ spin_lock_init(&cmd->error_lock);
+ spin_lock_init(&cmd->r2t_lock);
+ timer_setup(&cmd->dataout_timer, iscsit_handle_dataout_timeout, 0);
+
+ return cmd;
+}
+EXPORT_SYMBOL(iscsit_allocate_cmd);
+
+struct iscsi_seq *iscsit_get_seq_holder_for_datain(
+ struct iscsi_cmd *cmd,
+ u32 seq_send_order)
+{
+ u32 i;
+
+ for (i = 0; i < cmd->seq_count; i++)
+ if (cmd->seq_list[i].seq_send_order == seq_send_order)
+ return &cmd->seq_list[i];
+
+ return NULL;
+}
+
+struct iscsi_seq *iscsit_get_seq_holder_for_r2t(struct iscsi_cmd *cmd)
+{
+ u32 i;
+
+ if (!cmd->seq_list) {
+ pr_err("struct iscsi_cmd->seq_list is NULL!\n");
+ return NULL;
+ }
+
+ for (i = 0; i < cmd->seq_count; i++) {
+ if (cmd->seq_list[i].type != SEQTYPE_NORMAL)
+ continue;
+ if (cmd->seq_list[i].seq_send_order == cmd->seq_send_order) {
+ cmd->seq_send_order++;
+ return &cmd->seq_list[i];
+ }
+ }
+
+ return NULL;
+}
+
+struct iscsi_r2t *iscsit_get_holder_for_r2tsn(
+ struct iscsi_cmd *cmd,
+ u32 r2t_sn)
+{
+ struct iscsi_r2t *r2t;
+
+ spin_lock_bh(&cmd->r2t_lock);
+ list_for_each_entry(r2t, &cmd->cmd_r2t_list, r2t_list) {
+ if (r2t->r2t_sn == r2t_sn) {
+ spin_unlock_bh(&cmd->r2t_lock);
+ return r2t;
+ }
+ }
+ spin_unlock_bh(&cmd->r2t_lock);
+
+ return NULL;
+}
+
+static inline int iscsit_check_received_cmdsn(struct iscsi_session *sess, u32 cmdsn)
+{
+ u32 max_cmdsn;
+ int ret;
+
+ /*
+ * This is the proper method of checking received CmdSN against
+ * ExpCmdSN and MaxCmdSN values, as well as accounting for out
+ * or order CmdSNs due to multiple connection sessions and/or
+ * CRC failures.
+ */
+ max_cmdsn = atomic_read(&sess->max_cmd_sn);
+ if (iscsi_sna_gt(cmdsn, max_cmdsn)) {
+ pr_err("Received CmdSN: 0x%08x is greater than"
+ " MaxCmdSN: 0x%08x, ignoring.\n", cmdsn, max_cmdsn);
+ ret = CMDSN_MAXCMDSN_OVERRUN;
+
+ } else if (cmdsn == sess->exp_cmd_sn) {
+ sess->exp_cmd_sn++;
+ pr_debug("Received CmdSN matches ExpCmdSN,"
+ " incremented ExpCmdSN to: 0x%08x\n",
+ sess->exp_cmd_sn);
+ ret = CMDSN_NORMAL_OPERATION;
+
+ } else if (iscsi_sna_gt(cmdsn, sess->exp_cmd_sn)) {
+ pr_debug("Received CmdSN: 0x%08x is greater"
+ " than ExpCmdSN: 0x%08x, not acknowledging.\n",
+ cmdsn, sess->exp_cmd_sn);
+ ret = CMDSN_HIGHER_THAN_EXP;
+
+ } else {
+ pr_err("Received CmdSN: 0x%08x is less than"
+ " ExpCmdSN: 0x%08x, ignoring.\n", cmdsn,
+ sess->exp_cmd_sn);
+ ret = CMDSN_LOWER_THAN_EXP;
+ }
+
+ return ret;
+}
+
+/*
+ * Commands may be received out of order if MC/S is in use.
+ * Ensure they are executed in CmdSN order.
+ */
+int iscsit_sequence_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
+ unsigned char *buf, __be32 cmdsn)
+{
+ int ret, cmdsn_ret;
+ bool reject = false;
+ u8 reason = ISCSI_REASON_BOOKMARK_NO_RESOURCES;
+
+ mutex_lock(&conn->sess->cmdsn_mutex);
+
+ cmdsn_ret = iscsit_check_received_cmdsn(conn->sess, be32_to_cpu(cmdsn));
+ switch (cmdsn_ret) {
+ case CMDSN_NORMAL_OPERATION:
+ ret = iscsit_execute_cmd(cmd, 0);
+ if ((ret >= 0) && !list_empty(&conn->sess->sess_ooo_cmdsn_list))
+ iscsit_execute_ooo_cmdsns(conn->sess);
+ else if (ret < 0) {
+ reject = true;
+ ret = CMDSN_ERROR_CANNOT_RECOVER;
+ }
+ break;
+ case CMDSN_HIGHER_THAN_EXP:
+ ret = iscsit_handle_ooo_cmdsn(conn->sess, cmd, be32_to_cpu(cmdsn));
+ if (ret < 0) {
+ reject = true;
+ ret = CMDSN_ERROR_CANNOT_RECOVER;
+ break;
+ }
+ ret = CMDSN_HIGHER_THAN_EXP;
+ break;
+ case CMDSN_LOWER_THAN_EXP:
+ case CMDSN_MAXCMDSN_OVERRUN:
+ default:
+ cmd->i_state = ISTATE_REMOVE;
+ iscsit_add_cmd_to_immediate_queue(cmd, conn, cmd->i_state);
+ /*
+ * Existing callers for iscsit_sequence_cmd() will silently
+ * ignore commands with CMDSN_LOWER_THAN_EXP, so force this
+ * return for CMDSN_MAXCMDSN_OVERRUN as well..
+ */
+ ret = CMDSN_LOWER_THAN_EXP;
+ break;
+ }
+ mutex_unlock(&conn->sess->cmdsn_mutex);
+
+ if (reject)
+ iscsit_reject_cmd(cmd, reason, buf);
+
+ return ret;
+}
+EXPORT_SYMBOL(iscsit_sequence_cmd);
+
+int iscsit_check_unsolicited_dataout(struct iscsi_cmd *cmd, unsigned char *buf)
+{
+ struct iscsi_conn *conn = cmd->conn;
+ struct se_cmd *se_cmd = &cmd->se_cmd;
+ struct iscsi_data *hdr = (struct iscsi_data *) buf;
+ u32 payload_length = ntoh24(hdr->dlength);
+
+ if (conn->sess->sess_ops->InitialR2T) {
+ pr_err("Received unexpected unsolicited data"
+ " while InitialR2T=Yes, protocol error.\n");
+ transport_send_check_condition_and_sense(se_cmd,
+ TCM_UNEXPECTED_UNSOLICITED_DATA, 0);
+ return -1;
+ }
+
+ if ((cmd->first_burst_len + payload_length) >
+ conn->sess->sess_ops->FirstBurstLength) {
+ pr_err("Total %u bytes exceeds FirstBurstLength: %u"
+ " for this Unsolicited DataOut Burst.\n",
+ (cmd->first_burst_len + payload_length),
+ conn->sess->sess_ops->FirstBurstLength);
+ transport_send_check_condition_and_sense(se_cmd,
+ TCM_INCORRECT_AMOUNT_OF_DATA, 0);
+ return -1;
+ }
+
+ if (!(hdr->flags & ISCSI_FLAG_CMD_FINAL))
+ return 0;
+
+ if (((cmd->first_burst_len + payload_length) != cmd->se_cmd.data_length) &&
+ ((cmd->first_burst_len + payload_length) !=
+ conn->sess->sess_ops->FirstBurstLength)) {
+ pr_err("Unsolicited non-immediate data received %u"
+ " does not equal FirstBurstLength: %u, and does"
+ " not equal ExpXferLen %u.\n",
+ (cmd->first_burst_len + payload_length),
+ conn->sess->sess_ops->FirstBurstLength, cmd->se_cmd.data_length);
+ transport_send_check_condition_and_sense(se_cmd,
+ TCM_INCORRECT_AMOUNT_OF_DATA, 0);
+ return -1;
+ }
+ return 0;
+}
+
+struct iscsi_cmd *iscsit_find_cmd_from_itt(
+ struct iscsi_conn *conn,
+ itt_t init_task_tag)
+{
+ struct iscsi_cmd *cmd;
+
+ spin_lock_bh(&conn->cmd_lock);
+ list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) {
+ if (cmd->init_task_tag == init_task_tag) {
+ spin_unlock_bh(&conn->cmd_lock);
+ return cmd;
+ }
+ }
+ spin_unlock_bh(&conn->cmd_lock);
+
+ pr_err("Unable to locate ITT: 0x%08x on CID: %hu",
+ init_task_tag, conn->cid);
+ return NULL;
+}
+EXPORT_SYMBOL(iscsit_find_cmd_from_itt);
+
+struct iscsi_cmd *iscsit_find_cmd_from_itt_or_dump(
+ struct iscsi_conn *conn,
+ itt_t init_task_tag,
+ u32 length)
+{
+ struct iscsi_cmd *cmd;
+
+ spin_lock_bh(&conn->cmd_lock);
+ list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) {
+ if (cmd->cmd_flags & ICF_GOT_LAST_DATAOUT)
+ continue;
+ if (cmd->init_task_tag == init_task_tag) {
+ spin_unlock_bh(&conn->cmd_lock);
+ return cmd;
+ }
+ }
+ spin_unlock_bh(&conn->cmd_lock);
+
+ pr_err("Unable to locate ITT: 0x%08x on CID: %hu,"
+ " dumping payload\n", init_task_tag, conn->cid);
+ if (length)
+ iscsit_dump_data_payload(conn, length, 1);
+
+ return NULL;
+}
+EXPORT_SYMBOL(iscsit_find_cmd_from_itt_or_dump);
+
+struct iscsi_cmd *iscsit_find_cmd_from_ttt(
+ struct iscsi_conn *conn,
+ u32 targ_xfer_tag)
+{
+ struct iscsi_cmd *cmd = NULL;
+
+ spin_lock_bh(&conn->cmd_lock);
+ list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) {
+ if (cmd->targ_xfer_tag == targ_xfer_tag) {
+ spin_unlock_bh(&conn->cmd_lock);
+ return cmd;
+ }
+ }
+ spin_unlock_bh(&conn->cmd_lock);
+
+ pr_err("Unable to locate TTT: 0x%08x on CID: %hu\n",
+ targ_xfer_tag, conn->cid);
+ return NULL;
+}
+
+int iscsit_find_cmd_for_recovery(
+ struct iscsi_session *sess,
+ struct iscsi_cmd **cmd_ptr,
+ struct iscsi_conn_recovery **cr_ptr,
+ itt_t init_task_tag)
+{
+ struct iscsi_cmd *cmd = NULL;
+ struct iscsi_conn_recovery *cr;
+ /*
+ * Scan through the inactive connection recovery list's command list.
+ * If init_task_tag matches the command is still alligent.
+ */
+ spin_lock(&sess->cr_i_lock);
+ list_for_each_entry(cr, &sess->cr_inactive_list, cr_list) {
+ spin_lock(&cr->conn_recovery_cmd_lock);
+ list_for_each_entry(cmd, &cr->conn_recovery_cmd_list, i_conn_node) {
+ if (cmd->init_task_tag == init_task_tag) {
+ spin_unlock(&cr->conn_recovery_cmd_lock);
+ spin_unlock(&sess->cr_i_lock);
+
+ *cr_ptr = cr;
+ *cmd_ptr = cmd;
+ return -2;
+ }
+ }
+ spin_unlock(&cr->conn_recovery_cmd_lock);
+ }
+ spin_unlock(&sess->cr_i_lock);
+ /*
+ * Scan through the active connection recovery list's command list.
+ * If init_task_tag matches the command is ready to be reassigned.
+ */
+ spin_lock(&sess->cr_a_lock);
+ list_for_each_entry(cr, &sess->cr_active_list, cr_list) {
+ spin_lock(&cr->conn_recovery_cmd_lock);
+ list_for_each_entry(cmd, &cr->conn_recovery_cmd_list, i_conn_node) {
+ if (cmd->init_task_tag == init_task_tag) {
+ spin_unlock(&cr->conn_recovery_cmd_lock);
+ spin_unlock(&sess->cr_a_lock);
+
+ *cr_ptr = cr;
+ *cmd_ptr = cmd;
+ return 0;
+ }
+ }
+ spin_unlock(&cr->conn_recovery_cmd_lock);
+ }
+ spin_unlock(&sess->cr_a_lock);
+
+ return -1;
+}
+
+void iscsit_add_cmd_to_immediate_queue(
+ struct iscsi_cmd *cmd,
+ struct iscsi_conn *conn,
+ u8 state)
+{
+ struct iscsi_queue_req *qr;
+
+ qr = kmem_cache_zalloc(lio_qr_cache, GFP_ATOMIC);
+ if (!qr) {
+ pr_err("Unable to allocate memory for"
+ " struct iscsi_queue_req\n");
+ return;
+ }
+ INIT_LIST_HEAD(&qr->qr_list);
+ qr->cmd = cmd;
+ qr->state = state;
+
+ spin_lock_bh(&conn->immed_queue_lock);
+ list_add_tail(&qr->qr_list, &conn->immed_queue_list);
+ atomic_inc(&cmd->immed_queue_count);
+ atomic_set(&conn->check_immediate_queue, 1);
+ spin_unlock_bh(&conn->immed_queue_lock);
+
+ wake_up(&conn->queues_wq);
+}
+EXPORT_SYMBOL(iscsit_add_cmd_to_immediate_queue);
+
+struct iscsi_queue_req *iscsit_get_cmd_from_immediate_queue(struct iscsi_conn *conn)
+{
+ struct iscsi_queue_req *qr;
+
+ spin_lock_bh(&conn->immed_queue_lock);
+ if (list_empty(&conn->immed_queue_list)) {
+ spin_unlock_bh(&conn->immed_queue_lock);
+ return NULL;
+ }
+ qr = list_first_entry(&conn->immed_queue_list,
+ struct iscsi_queue_req, qr_list);
+
+ list_del(&qr->qr_list);
+ if (qr->cmd)
+ atomic_dec(&qr->cmd->immed_queue_count);
+ spin_unlock_bh(&conn->immed_queue_lock);
+
+ return qr;
+}
+
+static void iscsit_remove_cmd_from_immediate_queue(
+ struct iscsi_cmd *cmd,
+ struct iscsi_conn *conn)
+{
+ struct iscsi_queue_req *qr, *qr_tmp;
+
+ spin_lock_bh(&conn->immed_queue_lock);
+ if (!atomic_read(&cmd->immed_queue_count)) {
+ spin_unlock_bh(&conn->immed_queue_lock);
+ return;
+ }
+
+ list_for_each_entry_safe(qr, qr_tmp, &conn->immed_queue_list, qr_list) {
+ if (qr->cmd != cmd)
+ continue;
+
+ atomic_dec(&qr->cmd->immed_queue_count);
+ list_del(&qr->qr_list);
+ kmem_cache_free(lio_qr_cache, qr);
+ }
+ spin_unlock_bh(&conn->immed_queue_lock);
+
+ if (atomic_read(&cmd->immed_queue_count)) {
+ pr_err("ITT: 0x%08x immed_queue_count: %d\n",
+ cmd->init_task_tag,
+ atomic_read(&cmd->immed_queue_count));
+ }
+}
+
+int iscsit_add_cmd_to_response_queue(
+ struct iscsi_cmd *cmd,
+ struct iscsi_conn *conn,
+ u8 state)
+{
+ struct iscsi_queue_req *qr;
+
+ qr = kmem_cache_zalloc(lio_qr_cache, GFP_ATOMIC);
+ if (!qr) {
+ pr_err("Unable to allocate memory for"
+ " struct iscsi_queue_req\n");
+ return -ENOMEM;
+ }
+ INIT_LIST_HEAD(&qr->qr_list);
+ qr->cmd = cmd;
+ qr->state = state;
+
+ spin_lock_bh(&conn->response_queue_lock);
+ list_add_tail(&qr->qr_list, &conn->response_queue_list);
+ atomic_inc(&cmd->response_queue_count);
+ spin_unlock_bh(&conn->response_queue_lock);
+
+ wake_up(&conn->queues_wq);
+ return 0;
+}
+
+struct iscsi_queue_req *iscsit_get_cmd_from_response_queue(struct iscsi_conn *conn)
+{
+ struct iscsi_queue_req *qr;
+
+ spin_lock_bh(&conn->response_queue_lock);
+ if (list_empty(&conn->response_queue_list)) {
+ spin_unlock_bh(&conn->response_queue_lock);
+ return NULL;
+ }
+
+ qr = list_first_entry(&conn->response_queue_list,
+ struct iscsi_queue_req, qr_list);
+
+ list_del(&qr->qr_list);
+ if (qr->cmd)
+ atomic_dec(&qr->cmd->response_queue_count);
+ spin_unlock_bh(&conn->response_queue_lock);
+
+ return qr;
+}
+
+static void iscsit_remove_cmd_from_response_queue(
+ struct iscsi_cmd *cmd,
+ struct iscsi_conn *conn)
+{
+ struct iscsi_queue_req *qr, *qr_tmp;
+
+ spin_lock_bh(&conn->response_queue_lock);
+ if (!atomic_read(&cmd->response_queue_count)) {
+ spin_unlock_bh(&conn->response_queue_lock);
+ return;
+ }
+
+ list_for_each_entry_safe(qr, qr_tmp, &conn->response_queue_list,
+ qr_list) {
+ if (qr->cmd != cmd)
+ continue;
+
+ atomic_dec(&qr->cmd->response_queue_count);
+ list_del(&qr->qr_list);
+ kmem_cache_free(lio_qr_cache, qr);
+ }
+ spin_unlock_bh(&conn->response_queue_lock);
+
+ if (atomic_read(&cmd->response_queue_count)) {
+ pr_err("ITT: 0x%08x response_queue_count: %d\n",
+ cmd->init_task_tag,
+ atomic_read(&cmd->response_queue_count));
+ }
+}
+
+bool iscsit_conn_all_queues_empty(struct iscsi_conn *conn)
+{
+ bool empty;
+
+ spin_lock_bh(&conn->immed_queue_lock);
+ empty = list_empty(&conn->immed_queue_list);
+ spin_unlock_bh(&conn->immed_queue_lock);
+
+ if (!empty)
+ return empty;
+
+ spin_lock_bh(&conn->response_queue_lock);
+ empty = list_empty(&conn->response_queue_list);
+ spin_unlock_bh(&conn->response_queue_lock);
+
+ return empty;
+}
+
+void iscsit_free_queue_reqs_for_conn(struct iscsi_conn *conn)
+{
+ struct iscsi_queue_req *qr, *qr_tmp;
+
+ spin_lock_bh(&conn->immed_queue_lock);
+ list_for_each_entry_safe(qr, qr_tmp, &conn->immed_queue_list, qr_list) {
+ list_del(&qr->qr_list);
+ if (qr->cmd)
+ atomic_dec(&qr->cmd->immed_queue_count);
+
+ kmem_cache_free(lio_qr_cache, qr);
+ }
+ spin_unlock_bh(&conn->immed_queue_lock);
+
+ spin_lock_bh(&conn->response_queue_lock);
+ list_for_each_entry_safe(qr, qr_tmp, &conn->response_queue_list,
+ qr_list) {
+ list_del(&qr->qr_list);
+ if (qr->cmd)
+ atomic_dec(&qr->cmd->response_queue_count);
+
+ kmem_cache_free(lio_qr_cache, qr);
+ }
+ spin_unlock_bh(&conn->response_queue_lock);
+}
+
+void iscsit_release_cmd(struct iscsi_cmd *cmd)
+{
+ struct iscsi_session *sess;
+ struct se_cmd *se_cmd = &cmd->se_cmd;
+
+ WARN_ON(!list_empty(&cmd->i_conn_node));
+
+ if (cmd->conn)
+ sess = cmd->conn->sess;
+ else
+ sess = cmd->sess;
+
+ BUG_ON(!sess || !sess->se_sess);
+
+ kfree(cmd->buf_ptr);
+ kfree(cmd->pdu_list);
+ kfree(cmd->seq_list);
+ kfree(cmd->tmr_req);
+ kfree(cmd->overflow_buf);
+ kfree(cmd->iov_data);
+ kfree(cmd->text_in_ptr);
+
+ target_free_tag(sess->se_sess, se_cmd);
+}
+EXPORT_SYMBOL(iscsit_release_cmd);
+
+void __iscsit_free_cmd(struct iscsi_cmd *cmd, bool check_queues)
+{
+ struct iscsi_conn *conn = cmd->conn;
+
+ WARN_ON(!list_empty(&cmd->i_conn_node));
+
+ if (cmd->data_direction == DMA_TO_DEVICE) {
+ iscsit_stop_dataout_timer(cmd);
+ iscsit_free_r2ts_from_list(cmd);
+ }
+ if (cmd->data_direction == DMA_FROM_DEVICE)
+ iscsit_free_all_datain_reqs(cmd);
+
+ if (conn && check_queues) {
+ iscsit_remove_cmd_from_immediate_queue(cmd, conn);
+ iscsit_remove_cmd_from_response_queue(cmd, conn);
+ }
+
+ if (conn && conn->conn_transport->iscsit_unmap_cmd)
+ conn->conn_transport->iscsit_unmap_cmd(conn, cmd);
+}
+
+void iscsit_free_cmd(struct iscsi_cmd *cmd, bool shutdown)
+{
+ struct se_cmd *se_cmd = cmd->se_cmd.se_tfo ? &cmd->se_cmd : NULL;
+ int rc;
+
+ WARN_ON(!list_empty(&cmd->i_conn_node));
+
+ __iscsit_free_cmd(cmd, shutdown);
+ if (se_cmd) {
+ rc = transport_generic_free_cmd(se_cmd, shutdown);
+ if (!rc && shutdown && se_cmd->se_sess) {
+ __iscsit_free_cmd(cmd, shutdown);
+ target_put_sess_cmd(se_cmd);
+ }
+ } else {
+ iscsit_release_cmd(cmd);
+ }
+}
+EXPORT_SYMBOL(iscsit_free_cmd);
+
+int iscsit_check_session_usage_count(struct iscsi_session *sess)
+{
+ spin_lock_bh(&sess->session_usage_lock);
+ if (sess->session_usage_count != 0) {
+ sess->session_waiting_on_uc = 1;
+ spin_unlock_bh(&sess->session_usage_lock);
+ if (in_interrupt())
+ return 2;
+
+ wait_for_completion(&sess->session_waiting_on_uc_comp);
+ return 1;
+ }
+ spin_unlock_bh(&sess->session_usage_lock);
+
+ return 0;
+}
+
+void iscsit_dec_session_usage_count(struct iscsi_session *sess)
+{
+ spin_lock_bh(&sess->session_usage_lock);
+ sess->session_usage_count--;
+
+ if (!sess->session_usage_count && sess->session_waiting_on_uc)
+ complete(&sess->session_waiting_on_uc_comp);
+
+ spin_unlock_bh(&sess->session_usage_lock);
+}
+
+void iscsit_inc_session_usage_count(struct iscsi_session *sess)
+{
+ spin_lock_bh(&sess->session_usage_lock);
+ sess->session_usage_count++;
+ spin_unlock_bh(&sess->session_usage_lock);
+}
+
+struct iscsi_conn *iscsit_get_conn_from_cid(struct iscsi_session *sess, u16 cid)
+{
+ struct iscsi_conn *conn;
+
+ spin_lock_bh(&sess->conn_lock);
+ list_for_each_entry(conn, &sess->sess_conn_list, conn_list) {
+ if ((conn->cid == cid) &&
+ (conn->conn_state == TARG_CONN_STATE_LOGGED_IN)) {
+ iscsit_inc_conn_usage_count(conn);
+ spin_unlock_bh(&sess->conn_lock);
+ return conn;
+ }
+ }
+ spin_unlock_bh(&sess->conn_lock);
+
+ return NULL;
+}
+
+struct iscsi_conn *iscsit_get_conn_from_cid_rcfr(struct iscsi_session *sess, u16 cid)
+{
+ struct iscsi_conn *conn;
+
+ spin_lock_bh(&sess->conn_lock);
+ list_for_each_entry(conn, &sess->sess_conn_list, conn_list) {
+ if (conn->cid == cid) {
+ iscsit_inc_conn_usage_count(conn);
+ spin_lock(&conn->state_lock);
+ atomic_set(&conn->connection_wait_rcfr, 1);
+ spin_unlock(&conn->state_lock);
+ spin_unlock_bh(&sess->conn_lock);
+ return conn;
+ }
+ }
+ spin_unlock_bh(&sess->conn_lock);
+
+ return NULL;
+}
+
+void iscsit_check_conn_usage_count(struct iscsi_conn *conn)
+{
+ spin_lock_bh(&conn->conn_usage_lock);
+ if (conn->conn_usage_count != 0) {
+ conn->conn_waiting_on_uc = 1;
+ spin_unlock_bh(&conn->conn_usage_lock);
+
+ wait_for_completion(&conn->conn_waiting_on_uc_comp);
+ return;
+ }
+ spin_unlock_bh(&conn->conn_usage_lock);
+}
+
+void iscsit_dec_conn_usage_count(struct iscsi_conn *conn)
+{
+ spin_lock_bh(&conn->conn_usage_lock);
+ conn->conn_usage_count--;
+
+ if (!conn->conn_usage_count && conn->conn_waiting_on_uc)
+ complete(&conn->conn_waiting_on_uc_comp);
+
+ spin_unlock_bh(&conn->conn_usage_lock);
+}
+
+void iscsit_inc_conn_usage_count(struct iscsi_conn *conn)
+{
+ spin_lock_bh(&conn->conn_usage_lock);
+ conn->conn_usage_count++;
+ spin_unlock_bh(&conn->conn_usage_lock);
+}
+
+static int iscsit_add_nopin(struct iscsi_conn *conn, int want_response)
+{
+ u8 state;
+ struct iscsi_cmd *cmd;
+
+ cmd = iscsit_allocate_cmd(conn, TASK_RUNNING);
+ if (!cmd)
+ return -1;
+
+ cmd->iscsi_opcode = ISCSI_OP_NOOP_IN;
+ state = (want_response) ? ISTATE_SEND_NOPIN_WANT_RESPONSE :
+ ISTATE_SEND_NOPIN_NO_RESPONSE;
+ cmd->init_task_tag = RESERVED_ITT;
+ cmd->targ_xfer_tag = (want_response) ?
+ session_get_next_ttt(conn->sess) : 0xFFFFFFFF;
+ spin_lock_bh(&conn->cmd_lock);
+ list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
+ spin_unlock_bh(&conn->cmd_lock);
+
+ if (want_response)
+ iscsit_start_nopin_response_timer(conn);
+ iscsit_add_cmd_to_immediate_queue(cmd, conn, state);
+
+ return 0;
+}
+
+void iscsit_handle_nopin_response_timeout(struct timer_list *t)
+{
+ struct iscsi_conn *conn = from_timer(conn, t, nopin_response_timer);
+ struct iscsi_session *sess = conn->sess;
+
+ iscsit_inc_conn_usage_count(conn);
+
+ spin_lock_bh(&conn->nopin_timer_lock);
+ if (conn->nopin_response_timer_flags & ISCSI_TF_STOP) {
+ spin_unlock_bh(&conn->nopin_timer_lock);
+ iscsit_dec_conn_usage_count(conn);
+ return;
+ }
+
+ pr_err("Did not receive response to NOPIN on CID: %hu, failing"
+ " connection for I_T Nexus %s,i,0x%6phN,%s,t,0x%02x\n",
+ conn->cid, sess->sess_ops->InitiatorName, sess->isid,
+ sess->tpg->tpg_tiqn->tiqn, (u32)sess->tpg->tpgt);
+ conn->nopin_response_timer_flags &= ~ISCSI_TF_RUNNING;
+ spin_unlock_bh(&conn->nopin_timer_lock);
+
+ iscsit_fill_cxn_timeout_err_stats(sess);
+ iscsit_cause_connection_reinstatement(conn, 0);
+ iscsit_dec_conn_usage_count(conn);
+}
+
+void iscsit_mod_nopin_response_timer(struct iscsi_conn *conn)
+{
+ struct iscsi_session *sess = conn->sess;
+ struct iscsi_node_attrib *na = iscsit_tpg_get_node_attrib(sess);
+
+ spin_lock_bh(&conn->nopin_timer_lock);
+ if (!(conn->nopin_response_timer_flags & ISCSI_TF_RUNNING)) {
+ spin_unlock_bh(&conn->nopin_timer_lock);
+ return;
+ }
+
+ mod_timer(&conn->nopin_response_timer,
+ (get_jiffies_64() + na->nopin_response_timeout * HZ));
+ spin_unlock_bh(&conn->nopin_timer_lock);
+}
+
+void iscsit_start_nopin_response_timer(struct iscsi_conn *conn)
+{
+ struct iscsi_session *sess = conn->sess;
+ struct iscsi_node_attrib *na = iscsit_tpg_get_node_attrib(sess);
+
+ spin_lock_bh(&conn->nopin_timer_lock);
+ if (conn->nopin_response_timer_flags & ISCSI_TF_RUNNING) {
+ spin_unlock_bh(&conn->nopin_timer_lock);
+ return;
+ }
+
+ conn->nopin_response_timer_flags &= ~ISCSI_TF_STOP;
+ conn->nopin_response_timer_flags |= ISCSI_TF_RUNNING;
+ mod_timer(&conn->nopin_response_timer,
+ jiffies + na->nopin_response_timeout * HZ);
+
+ pr_debug("Started NOPIN Response Timer on CID: %d to %u"
+ " seconds\n", conn->cid, na->nopin_response_timeout);
+ spin_unlock_bh(&conn->nopin_timer_lock);
+}
+
+void iscsit_stop_nopin_response_timer(struct iscsi_conn *conn)
+{
+ spin_lock_bh(&conn->nopin_timer_lock);
+ if (!(conn->nopin_response_timer_flags & ISCSI_TF_RUNNING)) {
+ spin_unlock_bh(&conn->nopin_timer_lock);
+ return;
+ }
+ conn->nopin_response_timer_flags |= ISCSI_TF_STOP;
+ spin_unlock_bh(&conn->nopin_timer_lock);
+
+ del_timer_sync(&conn->nopin_response_timer);
+
+ spin_lock_bh(&conn->nopin_timer_lock);
+ conn->nopin_response_timer_flags &= ~ISCSI_TF_RUNNING;
+ spin_unlock_bh(&conn->nopin_timer_lock);
+}
+
+void iscsit_handle_nopin_timeout(struct timer_list *t)
+{
+ struct iscsi_conn *conn = from_timer(conn, t, nopin_timer);
+
+ iscsit_inc_conn_usage_count(conn);
+
+ spin_lock_bh(&conn->nopin_timer_lock);
+ if (conn->nopin_timer_flags & ISCSI_TF_STOP) {
+ spin_unlock_bh(&conn->nopin_timer_lock);
+ iscsit_dec_conn_usage_count(conn);
+ return;
+ }
+ conn->nopin_timer_flags &= ~ISCSI_TF_RUNNING;
+ spin_unlock_bh(&conn->nopin_timer_lock);
+
+ iscsit_add_nopin(conn, 1);
+ iscsit_dec_conn_usage_count(conn);
+}
+
+void __iscsit_start_nopin_timer(struct iscsi_conn *conn)
+{
+ struct iscsi_session *sess = conn->sess;
+ struct iscsi_node_attrib *na = iscsit_tpg_get_node_attrib(sess);
+
+ lockdep_assert_held(&conn->nopin_timer_lock);
+
+ /*
+ * NOPIN timeout is disabled.
+ */
+ if (!na->nopin_timeout)
+ return;
+
+ if (conn->nopin_timer_flags & ISCSI_TF_RUNNING)
+ return;
+
+ conn->nopin_timer_flags &= ~ISCSI_TF_STOP;
+ conn->nopin_timer_flags |= ISCSI_TF_RUNNING;
+ mod_timer(&conn->nopin_timer, jiffies + na->nopin_timeout * HZ);
+
+ pr_debug("Started NOPIN Timer on CID: %d at %u second"
+ " interval\n", conn->cid, na->nopin_timeout);
+}
+
+void iscsit_start_nopin_timer(struct iscsi_conn *conn)
+{
+ spin_lock_bh(&conn->nopin_timer_lock);
+ __iscsit_start_nopin_timer(conn);
+ spin_unlock_bh(&conn->nopin_timer_lock);
+}
+
+void iscsit_stop_nopin_timer(struct iscsi_conn *conn)
+{
+ spin_lock_bh(&conn->nopin_timer_lock);
+ if (!(conn->nopin_timer_flags & ISCSI_TF_RUNNING)) {
+ spin_unlock_bh(&conn->nopin_timer_lock);
+ return;
+ }
+ conn->nopin_timer_flags |= ISCSI_TF_STOP;
+ spin_unlock_bh(&conn->nopin_timer_lock);
+
+ del_timer_sync(&conn->nopin_timer);
+
+ spin_lock_bh(&conn->nopin_timer_lock);
+ conn->nopin_timer_flags &= ~ISCSI_TF_RUNNING;
+ spin_unlock_bh(&conn->nopin_timer_lock);
+}
+
+int iscsit_send_tx_data(
+ struct iscsi_cmd *cmd,
+ struct iscsi_conn *conn,
+ int use_misc)
+{
+ int tx_sent, tx_size;
+ u32 iov_count;
+ struct kvec *iov;
+
+send_data:
+ tx_size = cmd->tx_size;
+
+ if (!use_misc) {
+ iov = &cmd->iov_data[0];
+ iov_count = cmd->iov_data_count;
+ } else {
+ iov = &cmd->iov_misc[0];
+ iov_count = cmd->iov_misc_count;
+ }
+
+ tx_sent = tx_data(conn, &iov[0], iov_count, tx_size);
+ if (tx_size != tx_sent) {
+ if (tx_sent == -EAGAIN) {
+ pr_err("tx_data() returned -EAGAIN\n");
+ goto send_data;
+ } else
+ return -1;
+ }
+ cmd->tx_size = 0;
+
+ return 0;
+}
+
+int iscsit_fe_sendpage_sg(
+ struct iscsi_cmd *cmd,
+ struct iscsi_conn *conn)
+{
+ struct scatterlist *sg = cmd->first_data_sg;
+ struct kvec iov;
+ u32 tx_hdr_size, data_len;
+ u32 offset = cmd->first_data_sg_off;
+ int tx_sent, iov_off;
+
+send_hdr:
+ tx_hdr_size = ISCSI_HDR_LEN;
+ if (conn->conn_ops->HeaderDigest)
+ tx_hdr_size += ISCSI_CRC_LEN;
+
+ iov.iov_base = cmd->pdu;
+ iov.iov_len = tx_hdr_size;
+
+ tx_sent = tx_data(conn, &iov, 1, tx_hdr_size);
+ if (tx_hdr_size != tx_sent) {
+ if (tx_sent == -EAGAIN) {
+ pr_err("tx_data() returned -EAGAIN\n");
+ goto send_hdr;
+ }
+ return -1;
+ }
+
+ data_len = cmd->tx_size - tx_hdr_size - cmd->padding;
+ /*
+ * Set iov_off used by padding and data digest tx_data() calls below
+ * in order to determine proper offset into cmd->iov_data[]
+ */
+ if (conn->conn_ops->DataDigest) {
+ data_len -= ISCSI_CRC_LEN;
+ if (cmd->padding)
+ iov_off = (cmd->iov_data_count - 2);
+ else
+ iov_off = (cmd->iov_data_count - 1);
+ } else {
+ iov_off = (cmd->iov_data_count - 1);
+ }
+ /*
+ * Perform sendpage() for each page in the scatterlist
+ */
+ while (data_len) {
+ u32 space = (sg->length - offset);
+ u32 sub_len = min_t(u32, data_len, space);
+send_pg:
+ tx_sent = conn->sock->ops->sendpage(conn->sock,
+ sg_page(sg), sg->offset + offset, sub_len, 0);
+ if (tx_sent != sub_len) {
+ if (tx_sent == -EAGAIN) {
+ pr_err("tcp_sendpage() returned"
+ " -EAGAIN\n");
+ goto send_pg;
+ }
+
+ pr_err("tcp_sendpage() failure: %d\n",
+ tx_sent);
+ return -1;
+ }
+
+ data_len -= sub_len;
+ offset = 0;
+ sg = sg_next(sg);
+ }
+
+send_padding:
+ if (cmd->padding) {
+ struct kvec *iov_p = &cmd->iov_data[iov_off++];
+
+ tx_sent = tx_data(conn, iov_p, 1, cmd->padding);
+ if (cmd->padding != tx_sent) {
+ if (tx_sent == -EAGAIN) {
+ pr_err("tx_data() returned -EAGAIN\n");
+ goto send_padding;
+ }
+ return -1;
+ }
+ }
+
+send_datacrc:
+ if (conn->conn_ops->DataDigest) {
+ struct kvec *iov_d = &cmd->iov_data[iov_off];
+
+ tx_sent = tx_data(conn, iov_d, 1, ISCSI_CRC_LEN);
+ if (ISCSI_CRC_LEN != tx_sent) {
+ if (tx_sent == -EAGAIN) {
+ pr_err("tx_data() returned -EAGAIN\n");
+ goto send_datacrc;
+ }
+ return -1;
+ }
+ }
+
+ return 0;
+}
+
+/*
+ * This function is used for mainly sending a ISCSI_TARG_LOGIN_RSP PDU
+ * back to the Initiator when an expection condition occurs with the
+ * errors set in status_class and status_detail.
+ *
+ * Parameters: iSCSI Connection, Status Class, Status Detail.
+ * Returns: 0 on success, -1 on error.
+ */
+int iscsit_tx_login_rsp(struct iscsi_conn *conn, u8 status_class, u8 status_detail)
+{
+ struct iscsi_login_rsp *hdr;
+ struct iscsi_login *login = conn->conn_login;
+
+ login->login_failed = 1;
+ iscsit_collect_login_stats(conn, status_class, status_detail);
+
+ memset(&login->rsp[0], 0, ISCSI_HDR_LEN);
+
+ hdr = (struct iscsi_login_rsp *)&login->rsp[0];
+ hdr->opcode = ISCSI_OP_LOGIN_RSP;
+ hdr->status_class = status_class;
+ hdr->status_detail = status_detail;
+ hdr->itt = conn->login_itt;
+
+ return conn->conn_transport->iscsit_put_login_tx(conn, login, 0);
+}
+
+void iscsit_print_session_params(struct iscsi_session *sess)
+{
+ struct iscsi_conn *conn;
+
+ pr_debug("-----------------------------[Session Params for"
+ " SID: %u]-----------------------------\n", sess->sid);
+ spin_lock_bh(&sess->conn_lock);
+ list_for_each_entry(conn, &sess->sess_conn_list, conn_list)
+ iscsi_dump_conn_ops(conn->conn_ops);
+ spin_unlock_bh(&sess->conn_lock);
+
+ iscsi_dump_sess_ops(sess->sess_ops);
+}
+
+static int iscsit_do_rx_data(
+ struct iscsi_conn *conn,
+ struct iscsi_data_count *count)
+{
+ int data = count->data_length, rx_loop = 0, total_rx = 0;
+ struct msghdr msg;
+
+ if (!conn || !conn->sock || !conn->conn_ops)
+ return -1;
+
+ memset(&msg, 0, sizeof(struct msghdr));
+ iov_iter_kvec(&msg.msg_iter, READ, count->iov, count->iov_count, data);
+
+ while (msg_data_left(&msg)) {
+ rx_loop = sock_recvmsg(conn->sock, &msg, MSG_WAITALL);
+ if (rx_loop <= 0) {
+ pr_debug("rx_loop: %d total_rx: %d\n",
+ rx_loop, total_rx);
+ return rx_loop;
+ }
+ total_rx += rx_loop;
+ pr_debug("rx_loop: %d, total_rx: %d, data: %d\n",
+ rx_loop, total_rx, data);
+ }
+
+ return total_rx;
+}
+
+int rx_data(
+ struct iscsi_conn *conn,
+ struct kvec *iov,
+ int iov_count,
+ int data)
+{
+ struct iscsi_data_count c;
+
+ if (!conn || !conn->sock || !conn->conn_ops)
+ return -1;
+
+ memset(&c, 0, sizeof(struct iscsi_data_count));
+ c.iov = iov;
+ c.iov_count = iov_count;
+ c.data_length = data;
+ c.type = ISCSI_RX_DATA;
+
+ return iscsit_do_rx_data(conn, &c);
+}
+
+int tx_data(
+ struct iscsi_conn *conn,
+ struct kvec *iov,
+ int iov_count,
+ int data)
+{
+ struct msghdr msg;
+ int total_tx = 0;
+
+ if (!conn || !conn->sock || !conn->conn_ops)
+ return -1;
+
+ if (data <= 0) {
+ pr_err("Data length is: %d\n", data);
+ return -1;
+ }
+
+ memset(&msg, 0, sizeof(struct msghdr));
+
+ iov_iter_kvec(&msg.msg_iter, WRITE, iov, iov_count, data);
+
+ while (msg_data_left(&msg)) {
+ int tx_loop = sock_sendmsg(conn->sock, &msg);
+ if (tx_loop <= 0) {
+ pr_debug("tx_loop: %d total_tx %d\n",
+ tx_loop, total_tx);
+ return tx_loop;
+ }
+ total_tx += tx_loop;
+ pr_debug("tx_loop: %d, total_tx: %d, data: %d\n",
+ tx_loop, total_tx, data);
+ }
+
+ return total_tx;
+}
+
+void iscsit_collect_login_stats(
+ struct iscsi_conn *conn,
+ u8 status_class,
+ u8 status_detail)
+{
+ struct iscsi_param *intrname = NULL;
+ struct iscsi_tiqn *tiqn;
+ struct iscsi_login_stats *ls;
+
+ tiqn = iscsit_snmp_get_tiqn(conn);
+ if (!tiqn)
+ return;
+
+ ls = &tiqn->login_stats;
+
+ spin_lock(&ls->lock);
+ if (status_class == ISCSI_STATUS_CLS_SUCCESS)
+ ls->accepts++;
+ else if (status_class == ISCSI_STATUS_CLS_REDIRECT) {
+ ls->redirects++;
+ ls->last_fail_type = ISCSI_LOGIN_FAIL_REDIRECT;
+ } else if ((status_class == ISCSI_STATUS_CLS_INITIATOR_ERR) &&
+ (status_detail == ISCSI_LOGIN_STATUS_AUTH_FAILED)) {
+ ls->authenticate_fails++;
+ ls->last_fail_type = ISCSI_LOGIN_FAIL_AUTHENTICATE;
+ } else if ((status_class == ISCSI_STATUS_CLS_INITIATOR_ERR) &&
+ (status_detail == ISCSI_LOGIN_STATUS_TGT_FORBIDDEN)) {
+ ls->authorize_fails++;
+ ls->last_fail_type = ISCSI_LOGIN_FAIL_AUTHORIZE;
+ } else if ((status_class == ISCSI_STATUS_CLS_INITIATOR_ERR) &&
+ (status_detail == ISCSI_LOGIN_STATUS_INIT_ERR)) {
+ ls->negotiate_fails++;
+ ls->last_fail_type = ISCSI_LOGIN_FAIL_NEGOTIATE;
+ } else {
+ ls->other_fails++;
+ ls->last_fail_type = ISCSI_LOGIN_FAIL_OTHER;
+ }
+
+ /* Save initiator name, ip address and time, if it is a failed login */
+ if (status_class != ISCSI_STATUS_CLS_SUCCESS) {
+ if (conn->param_list)
+ intrname = iscsi_find_param_from_key(INITIATORNAME,
+ conn->param_list);
+ strlcpy(ls->last_intr_fail_name,
+ (intrname ? intrname->value : "Unknown"),
+ sizeof(ls->last_intr_fail_name));
+
+ ls->last_intr_fail_ip_family = conn->login_family;
+
+ ls->last_intr_fail_sockaddr = conn->login_sockaddr;
+ ls->last_fail_time = get_jiffies_64();
+ }
+
+ spin_unlock(&ls->lock);
+}
+
+struct iscsi_tiqn *iscsit_snmp_get_tiqn(struct iscsi_conn *conn)
+{
+ struct iscsi_portal_group *tpg;
+
+ if (!conn)
+ return NULL;
+
+ tpg = conn->tpg;
+ if (!tpg)
+ return NULL;
+
+ if (!tpg->tpg_tiqn)
+ return NULL;
+
+ return tpg->tpg_tiqn;
+}
+
+void iscsit_fill_cxn_timeout_err_stats(struct iscsi_session *sess)
+{
+ struct iscsi_portal_group *tpg = sess->tpg;
+ struct iscsi_tiqn *tiqn = tpg->tpg_tiqn;
+
+ if (!tiqn)
+ return;
+
+ spin_lock_bh(&tiqn->sess_err_stats.lock);
+ strlcpy(tiqn->sess_err_stats.last_sess_fail_rem_name,
+ sess->sess_ops->InitiatorName,
+ sizeof(tiqn->sess_err_stats.last_sess_fail_rem_name));
+ tiqn->sess_err_stats.last_sess_failure_type =
+ ISCSI_SESS_ERR_CXN_TIMEOUT;
+ tiqn->sess_err_stats.cxn_timeout_errors++;
+ atomic_long_inc(&sess->conn_timeout_errors);
+ spin_unlock_bh(&tiqn->sess_err_stats.lock);
+}