If protection is involved, iSER target must wait for
completion of RDMA_READ before sending SCSI response.
So we must consider that when calculating post_send_buf_count
additions, also when processing good/error completions.
Signed-off-by: Sagi Grimberg <sagig@xxxxxxxxxxxx>
---
drivers/infiniband/ulp/isert/ib_isert.c | 47 +++++++++++++++++++++++++++----
1 files changed, 41 insertions(+), 6 deletions(-)
diff --git a/drivers/infiniband/ulp/isert/ib_isert.c b/drivers/infiniband/ulp/isert/ib_isert.c
index e4ebb4c..faec224 100644
--- a/drivers/infiniband/ulp/isert/ib_isert.c
+++ b/drivers/infiniband/ulp/isert/ib_isert.c
@@ -1705,6 +1705,7 @@ isert_completion_rdma_write(struct iser_tx_desc *tx_desc,
fail_mr_status:
device->unreg_rdma_mem(isert_cmd, isert_conn);
+ wr->send_wr_num = 0;
if (ret)
transport_send_check_condition_and_sense(se_cmd,
se_cmd->pi_err, 0);
@@ -1838,7 +1839,18 @@ isert_response_completion(struct iser_tx_desc *tx_desc,
queue_work(isert_comp_wq, &isert_cmd->comp_work);
return;
}
- atomic_sub(wr->send_wr_num + 1, &isert_conn->post_send_buf_count);
+
+ /**
+ * If send_wr_num is 0 this means that we got
+ * RDMA completion and we cleared it and we should
+ * simply decrement the response post. else the
+ * response is incorporated in send_wr_num, just
+ * sub it.
+ **/
+ if (wr->send_wr_num)
+ atomic_sub(wr->send_wr_num, &isert_conn->post_send_buf_count);
+ else
+ atomic_dec(&isert_conn->post_send_buf_count);
cmd->i_state = ISTATE_SENT_STATUS;
isert_completion_put(tx_desc, isert_cmd, ib_dev);
@@ -1871,7 +1883,7 @@ __isert_send_completion(struct iser_tx_desc *tx_desc,
break;
case ISER_IB_RDMA_WRITE:
pr_debug("isert_send_completion: Got ISER_IB_RDMA_WRITE\n");
- atomic_dec(&isert_conn->post_send_buf_count);
+ atomic_sub(wr->send_wr_num, &isert_conn->post_send_buf_count);
isert_completion_rdma_write(tx_desc, isert_cmd);
break;
case ISER_IB_RDMA_READ:
@@ -1922,7 +1934,18 @@ isert_cq_drain_comp_llist(struct isert_conn *isert_conn, struct ib_device *ib_de
llnode = llist_next(llnode);
wr = &t->isert_cmd->rdma_wr;
- atomic_sub(wr->send_wr_num + 1, &isert_conn->post_send_buf_count);
+ /**
+ * If send_wr_num is 0 this means that we got
+ * RDMA completion and we cleared it and we should
+ * simply decrement the response post. else the
+ * response is incorporated in send_wr_num, just
+ * sub it.
+ **/
+ if (wr->send_wr_num)
+ atomic_sub(wr->send_wr_num,
+ &isert_conn->post_send_buf_count);
+ else
+ atomic_dec(&isert_conn->post_send_buf_count);
isert_completion_put(t, t->isert_cmd, ib_dev);
}
}
@@ -1941,7 +1964,18 @@ isert_cq_tx_comp_err(struct iser_tx_desc *tx_desc, struct isert_conn *isert_conn
llnode = llist_next(llnode);
wr = &t->isert_cmd->rdma_wr;
- atomic_sub(wr->send_wr_num + 1, &isert_conn->post_send_buf_count);
+ /**
+ * If send_wr_num is 0 this means that we got
+ * RDMA completion and we cleared it and we should
+ * simply decrement the response post. else the
+ * response is incorporated in send_wr_num, just
+ * sub it.
+ **/
+ if (wr->send_wr_num)
+ atomic_sub(wr->send_wr_num,
+ &isert_conn->post_send_buf_count);
+ else
+ atomic_dec(&isert_conn->post_send_buf_count);
isert_completion_put(t, t->isert_cmd, ib_dev);
}
tx_desc->comp_llnode_batch = NULL;
@@ -2795,14 +2829,15 @@ 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);
isert_cmd->rdma_wr.s_send_wr.next = &isert_cmd->tx_desc.send_wr;
+ wr->send_wr_num += 1;
}
- atomic_add(wr->send_wr_num + 1, &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_WRITE\n");
- atomic_sub(wr->send_wr_num + 1, &isert_conn->post_send_buf_count);
+ atomic_sub(wr->send_wr_num, &isert_conn->post_send_buf_count);
}
if (se_cmd->prot_op == TARGET_PROT_NORMAL)
--
1.7.1
--
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