1 files changed, 108 insertions, 72 deletions

diff --git a/drivers/infiniband/ulp/isert/ib_isert.c b/drivers/infiniband/ulp/isert/ib_isert.c
index d18d08a076e8..8ee228e9ab5a 100644
--- a/drivers/infiniband/ulp/isert/ib_isert.c
+++ b/drivers/infiniband/ulp/isert/ib_isert.c
@@ -492,12 +492,11 @@ isert_connect_request(struct rdma_cm_id *cma_id, struct rdma_cm_event *event)
         isert_conn->state = ISER_CONN_INIT;
         INIT_LIST_HEAD(&isert_conn->conn_accept_node);
         init_completion(&isert_conn->conn_login_comp);
-        init_waitqueue_head(&isert_conn->conn_wait);
-        init_waitqueue_head(&isert_conn->conn_wait_comp_err);
+        init_completion(&isert_conn->conn_wait);
+        init_completion(&isert_conn->conn_wait_comp_err);
         kref_init(&isert_conn->conn_kref);
         kref_get(&isert_conn->conn_kref);
         mutex_init(&isert_conn->conn_mutex);
-        mutex_init(&isert_conn->conn_comp_mutex);
         spin_lock_init(&isert_conn->conn_lock);
 
         cma_id->context = isert_conn;
@@ -688,11 +687,11 @@ isert_disconnect_work(struct work_struct *work)
 
         pr_debug("isert_disconnect_work(): >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>\n");
         mutex_lock(&isert_conn->conn_mutex);
-        isert_conn->state = ISER_CONN_DOWN;
+        if (isert_conn->state == ISER_CONN_UP)
+                isert_conn->state = ISER_CONN_TERMINATING;
 
         if (isert_conn->post_recv_buf_count == 0 &&
             atomic_read(&isert_conn->post_send_buf_count) == 0) {
-                pr_debug("Calling wake_up(&isert_conn->conn_wait);\n");
                 mutex_unlock(&isert_conn->conn_mutex);
                 goto wake_up;
         }
@@ -712,7 +711,7 @@ isert_disconnect_work(struct work_struct *work)
         mutex_unlock(&isert_conn->conn_mutex);
 
 wake_up:
-        wake_up(&isert_conn->conn_wait);
+        complete(&isert_conn->conn_wait);
         isert_put_conn(isert_conn);
 }
 
@@ -888,16 +887,17 @@ isert_init_send_wr(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd,
          * Coalesce send completion interrupts by only setting IB_SEND_SIGNALED
          * bit for every ISERT_COMP_BATCH_COUNT number of ib_post_send() calls.
          */
-        mutex_lock(&isert_conn->conn_comp_mutex);
-        if (coalesce &&
+        mutex_lock(&isert_conn->conn_mutex);
+        if (coalesce && isert_conn->state == ISER_CONN_UP &&
             ++isert_conn->conn_comp_batch < ISERT_COMP_BATCH_COUNT) {
+                tx_desc->llnode_active = true;
                 llist_add(&tx_desc->comp_llnode, &isert_conn->conn_comp_llist);
-                mutex_unlock(&isert_conn->conn_comp_mutex);
+                mutex_unlock(&isert_conn->conn_mutex);
                 return;
         }
         isert_conn->conn_comp_batch = 0;
         tx_desc->comp_llnode_batch = llist_del_all(&isert_conn->conn_comp_llist);
-        mutex_unlock(&isert_conn->conn_comp_mutex);
+        mutex_unlock(&isert_conn->conn_mutex);
 
         send_wr->send_flags = IB_SEND_SIGNALED;
 }
@@ -1464,7 +1464,7 @@ isert_put_cmd(struct isert_cmd *isert_cmd)
         case ISCSI_OP_SCSI_CMD:
                 spin_lock_bh(&conn->cmd_lock);
                 if (!list_empty(&cmd->i_conn_node))
-                        list_del(&cmd->i_conn_node);
+                        list_del_init(&cmd->i_conn_node);
                 spin_unlock_bh(&conn->cmd_lock);
 
                 if (cmd->data_direction == DMA_TO_DEVICE)
@@ -1476,7 +1476,7 @@ isert_put_cmd(struct isert_cmd *isert_cmd)
         case ISCSI_OP_SCSI_TMFUNC:
                 spin_lock_bh(&conn->cmd_lock);
                 if (!list_empty(&cmd->i_conn_node))
-                        list_del(&cmd->i_conn_node);
+                        list_del_init(&cmd->i_conn_node);
                 spin_unlock_bh(&conn->cmd_lock);
 
                 transport_generic_free_cmd(&cmd->se_cmd, 0);
@@ -1486,7 +1486,7 @@ isert_put_cmd(struct isert_cmd *isert_cmd)
         case ISCSI_OP_TEXT:
                 spin_lock_bh(&conn->cmd_lock);
                 if (!list_empty(&cmd->i_conn_node))
-                        list_del(&cmd->i_conn_node);
+                        list_del_init(&cmd->i_conn_node);
                 spin_unlock_bh(&conn->cmd_lock);
 
                 /*
@@ -1549,6 +1549,7 @@ isert_completion_rdma_read(struct iser_tx_desc *tx_desc,
         iscsit_stop_dataout_timer(cmd);
         device->unreg_rdma_mem(isert_cmd, isert_conn);
         cmd->write_data_done = wr->cur_rdma_length;
+        wr->send_wr_num = 0;
 
         pr_debug("Cmd: %p RDMA_READ comp calling execute_cmd\n", isert_cmd);
         spin_lock_bh(&cmd->istate_lock);
@@ -1589,7 +1590,7 @@ isert_do_control_comp(struct work_struct *work)
                 pr_debug("Calling iscsit_logout_post_handler >>>>>>>>>>>>>>\n");
                 /*
                  * Call atomic_dec(&isert_conn->post_send_buf_count)
-                 * from isert_free_conn()
+                 * from isert_wait_conn()
                  */
                 isert_conn->logout_posted = true;
                 iscsit_logout_post_handler(cmd, cmd->conn);
@@ -1613,6 +1614,7 @@ isert_response_completion(struct iser_tx_desc *tx_desc,
                           struct ib_device *ib_dev)
 {
         struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd;
+        struct isert_rdma_wr *wr = &isert_cmd->rdma_wr;
 
         if (cmd->i_state == ISTATE_SEND_TASKMGTRSP ||
             cmd->i_state == ISTATE_SEND_LOGOUTRSP ||
@@ -1624,7 +1626,7 @@ isert_response_completion(struct iser_tx_desc *tx_desc,
                 queue_work(isert_comp_wq, &isert_cmd->comp_work);
                 return;
         }
-        atomic_dec(&isert_conn->post_send_buf_count);
+        atomic_sub(wr->send_wr_num + 1, &isert_conn->post_send_buf_count);
 
         cmd->i_state = ISTATE_SENT_STATUS;
         isert_completion_put(tx_desc, isert_cmd, ib_dev);
@@ -1662,7 +1664,7 @@ __isert_send_completion(struct iser_tx_desc *tx_desc,
         case ISER_IB_RDMA_READ:
                 pr_debug("isert_send_completion: Got ISER_IB_RDMA_READ:\n");
 
-                atomic_dec(&isert_conn->post_send_buf_count);
+                atomic_sub(wr->send_wr_num, &isert_conn->post_send_buf_count);
                 isert_completion_rdma_read(tx_desc, isert_cmd);
                 break;
         default:
@@ -1691,31 +1693,76 @@ isert_send_completion(struct iser_tx_desc *tx_desc,
 }
 
 static void
-isert_cq_comp_err(struct iser_tx_desc *tx_desc, struct isert_conn *isert_conn)
+isert_cq_drain_comp_llist(struct isert_conn *isert_conn, struct ib_device *ib_dev)
+{
+        struct llist_node *llnode;
+        struct isert_rdma_wr *wr;
+        struct iser_tx_desc *t;
+
+        mutex_lock(&isert_conn->conn_mutex);
+        llnode = llist_del_all(&isert_conn->conn_comp_llist);
+        isert_conn->conn_comp_batch = 0;
+        mutex_unlock(&isert_conn->conn_mutex);
+
+        while (llnode) {
+                t = llist_entry(llnode, struct iser_tx_desc, comp_llnode);
+                llnode = llist_next(llnode);
+                wr = &t->isert_cmd->rdma_wr;
+
+                atomic_sub(wr->send_wr_num + 1, &isert_conn->post_send_buf_count);
+                isert_completion_put(t, t->isert_cmd, ib_dev);
+        }
+}
+
+static void
+isert_cq_tx_comp_err(struct iser_tx_desc *tx_desc, struct isert_conn *isert_conn)
 {
         struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
+        struct isert_cmd *isert_cmd = tx_desc->isert_cmd;
+        struct llist_node *llnode = tx_desc->comp_llnode_batch;
+        struct isert_rdma_wr *wr;
+        struct iser_tx_desc *t;
 
-        if (tx_desc) {
-                struct isert_cmd *isert_cmd = tx_desc->isert_cmd;
+        while (llnode) {
+                t = llist_entry(llnode, struct iser_tx_desc, comp_llnode);
+                llnode = llist_next(llnode);
+                wr = &t->isert_cmd->rdma_wr;
 
-                if (!isert_cmd)
-                        isert_unmap_tx_desc(tx_desc, ib_dev);
-                else
-                        isert_completion_put(tx_desc, isert_cmd, ib_dev);
+                atomic_sub(wr->send_wr_num + 1, &isert_conn->post_send_buf_count);
+                isert_completion_put(t, t->isert_cmd, ib_dev);
         }
+        tx_desc->comp_llnode_batch = NULL;
 
-        if (isert_conn->post_recv_buf_count == 0 &&
-            atomic_read(&isert_conn->post_send_buf_count) == 0) {
-                pr_debug("isert_cq_comp_err >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>\n");
-                pr_debug("Calling wake_up from isert_cq_comp_err\n");
+        if (!isert_cmd)
+                isert_unmap_tx_desc(tx_desc, ib_dev);
+        else
+                isert_completion_put(tx_desc, isert_cmd, ib_dev);
+}
 
-                mutex_lock(&isert_conn->conn_mutex);
-                if (isert_conn->state != ISER_CONN_DOWN)
-                        isert_conn->state = ISER_CONN_TERMINATING;
-                mutex_unlock(&isert_conn->conn_mutex);
+static void
+isert_cq_rx_comp_err(struct isert_conn *isert_conn)
+{
+        struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
+        struct iscsi_conn *conn = isert_conn->conn;
 
-                wake_up(&isert_conn->conn_wait_comp_err);
+        if (isert_conn->post_recv_buf_count)
+                return;
+
+        isert_cq_drain_comp_llist(isert_conn, ib_dev);
+
+        if (conn->sess) {
+                target_sess_cmd_list_set_waiting(conn->sess->se_sess);
+                target_wait_for_sess_cmds(conn->sess->se_sess);
         }
+
+        while (atomic_read(&isert_conn->post_send_buf_count))
+                msleep(3000);
+
+        mutex_lock(&isert_conn->conn_mutex);
+        isert_conn->state = ISER_CONN_DOWN;
+        mutex_unlock(&isert_conn->conn_mutex);
+
+        complete(&isert_conn->conn_wait_comp_err);
 }
 
 static void
@@ -1740,8 +1787,14 @@ isert_cq_tx_work(struct work_struct *work)
                         pr_debug("TX wc.status != IB_WC_SUCCESS >>>>>>>>>>>>>>\n");
                         pr_debug("TX wc.status: 0x%08x\n", wc.status);
                         pr_debug("TX wc.vendor_err: 0x%08x\n", wc.vendor_err);
-                        atomic_dec(&isert_conn->post_send_buf_count);
-                        isert_cq_comp_err(tx_desc, isert_conn);
+
+                        if (wc.wr_id != ISER_FASTREG_LI_WRID) {
+                                if (tx_desc->llnode_active)
+                                        continue;
+
+                                atomic_dec(&isert_conn->post_send_buf_count);
+                                isert_cq_tx_comp_err(tx_desc, isert_conn);
+                        }
                 }
         }
 
@@ -1784,7 +1837,7 @@ isert_cq_rx_work(struct work_struct *work)
                                          wc.vendor_err);
                         }
                         isert_conn->post_recv_buf_count--;
-                        isert_cq_comp_err(NULL, isert_conn);
+                        isert_cq_rx_comp_err(isert_conn);
                 }
         }
 
@@ -2202,6 +2255,7 @@ isert_fast_reg_mr(struct fast_reg_descriptor *fr_desc,
 
         if (!fr_desc->valid) {
                 memset(&inv_wr, 0, sizeof(inv_wr));
+                inv_wr.wr_id = ISER_FASTREG_LI_WRID;
                 inv_wr.opcode = IB_WR_LOCAL_INV;
                 inv_wr.ex.invalidate_rkey = fr_desc->data_mr->rkey;
                 wr = &inv_wr;
@@ -2212,6 +2266,7 @@ isert_fast_reg_mr(struct fast_reg_descriptor *fr_desc,
 
         /* Prepare FASTREG WR */
         memset(&fr_wr, 0, sizeof(fr_wr));
+        fr_wr.wr_id = ISER_FASTREG_LI_WRID;
         fr_wr.opcode = IB_WR_FAST_REG_MR;
         fr_wr.wr.fast_reg.iova_start =
                 fr_desc->data_frpl->page_list[0] + page_off;
@@ -2377,12 +2432,12 @@ isert_put_datain(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
         isert_init_send_wr(isert_conn, isert_cmd,
                            &isert_cmd->tx_desc.send_wr, true);
 
-        atomic_inc(&isert_conn->post_send_buf_count);
+        atomic_add(wr->send_wr_num + 1, &isert_conn->post_send_buf_count);
 
         rc = ib_post_send(isert_conn->conn_qp, wr->send_wr, &wr_failed);
         if (rc) {
                 pr_warn("ib_post_send() failed for IB_WR_RDMA_WRITE\n");
-                atomic_dec(&isert_conn->post_send_buf_count);
+                atomic_sub(wr->send_wr_num + 1, &isert_conn->post_send_buf_count);
         }
         pr_debug("Cmd: %p posted RDMA_WRITE + Response for iSER Data READ\n",
                  isert_cmd);
@@ -2410,12 +2465,12 @@ isert_get_dataout(struct iscsi_conn *conn, struct iscsi_cmd *cmd, bool recovery)
                 return rc;
         }
 
-        atomic_inc(&isert_conn->post_send_buf_count);
+        atomic_add(wr->send_wr_num, &isert_conn->post_send_buf_count);
 
         rc = ib_post_send(isert_conn->conn_qp, wr->send_wr, &wr_failed);
         if (rc) {
                 pr_warn("ib_post_send() failed for IB_WR_RDMA_READ\n");
-                atomic_dec(&isert_conn->post_send_buf_count);
+                atomic_sub(wr->send_wr_num, &isert_conn->post_send_buf_count);
         }
         pr_debug("Cmd: %p posted RDMA_READ memory for ISER Data WRITE\n",
                  isert_cmd);
@@ -2702,22 +2757,11 @@ isert_free_np(struct iscsi_np *np)
         kfree(isert_np);
 }
 
-static int isert_check_state(struct isert_conn *isert_conn, int state)
-{
-        int ret;
-
-        mutex_lock(&isert_conn->conn_mutex);
-        ret = (isert_conn->state == state);
-        mutex_unlock(&isert_conn->conn_mutex);
-
-        return ret;
-}
-
-static void isert_free_conn(struct iscsi_conn *conn)
+static void isert_wait_conn(struct iscsi_conn *conn)
 {
         struct isert_conn *isert_conn = conn->context;
 
-        pr_debug("isert_free_conn: Starting \n");
+        pr_debug("isert_wait_conn: Starting \n");
         /*
          * Decrement post_send_buf_count for special case when called
          * from isert_do_control_comp() -> iscsit_logout_post_handler()
@@ -2727,38 +2771,29 @@ static void isert_free_conn(struct iscsi_conn *conn)
                 atomic_dec(&isert_conn->post_send_buf_count);
 
         if (isert_conn->conn_cm_id && isert_conn->state != ISER_CONN_DOWN) {
-                pr_debug("Calling rdma_disconnect from isert_free_conn\n");
+                pr_debug("Calling rdma_disconnect from isert_wait_conn\n");
                 rdma_disconnect(isert_conn->conn_cm_id);
         }
         /*
          * Only wait for conn_wait_comp_err if the isert_conn made it
          * into full feature phase..
          */
-        if (isert_conn->state == ISER_CONN_UP) {
-                pr_debug("isert_free_conn: Before wait_event comp_err %d\n",
-                         isert_conn->state);
-                mutex_unlock(&isert_conn->conn_mutex);
-
-                wait_event(isert_conn->conn_wait_comp_err,
-                          (isert_check_state(isert_conn, ISER_CONN_TERMINATING)));
-
-                wait_event(isert_conn->conn_wait,
-                          (isert_check_state(isert_conn, ISER_CONN_DOWN)));
-
-                isert_put_conn(isert_conn);
-                return;
-        }
         if (isert_conn->state == ISER_CONN_INIT) {
                 mutex_unlock(&isert_conn->conn_mutex);
-                isert_put_conn(isert_conn);
                 return;
         }
-        pr_debug("isert_free_conn: wait_event conn_wait %d\n",
-                 isert_conn->state);
+        if (isert_conn->state == ISER_CONN_UP)
+                isert_conn->state = ISER_CONN_TERMINATING;
         mutex_unlock(&isert_conn->conn_mutex);
 
-        wait_event(isert_conn->conn_wait,
-                  (isert_check_state(isert_conn, ISER_CONN_DOWN)));
+        wait_for_completion(&isert_conn->conn_wait_comp_err);
+
+        wait_for_completion(&isert_conn->conn_wait);
+}
+
+static void isert_free_conn(struct iscsi_conn *conn)
+{
+        struct isert_conn *isert_conn = conn->context;
 
         isert_put_conn(isert_conn);
 }
@@ -2771,6 +2806,7 @@ static struct iscsit_transport iser_target_transport = {
         .iscsit_setup_np        = isert_setup_np,
         .iscsit_accept_np       = isert_accept_np,
         .iscsit_free_np         = isert_free_np,
+        .iscsit_wait_conn       = isert_wait_conn,
         .iscsit_free_conn       = isert_free_conn,
         .iscsit_get_login_rx    = isert_get_login_rx,
         .iscsit_put_login_tx    = isert_put_login_tx,