iser-target: Ignore completions for FRWRs in isert_cq_tx_work

This patch changes IB_WR_FAST_REG_MR + IB_WR_LOCAL_INV related
work requests to include a ISER_FRWR_LI_WRID value in order to
signal isert_cq_tx_work() that these requests should be ignored.

This is necessary because even though IB_SEND_SIGNALED is not
set for either work request, during a QP failure event the work
requests will be returned with exception status from the TX
completion queue.

v2 changes:
 - Rename ISER_FRWR_LI_WRID -> ISER_FASTREG_LI_WRID (Sagi)

Acked-by: Sagi Grimberg <sagig@mellanox.com>
Cc: Or Gerlitz <ogerlitz@mellanox.com>
Cc: <stable@vger.kernel.org> #3.12+
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>

diff --git a/drivers/infiniband/ulp/isert/ib_isert.c b/drivers/infiniband/ulp/isert/ib_isert.c
index a70b0cf..614a6ef 100644 (file)
--- a/drivers/infiniband/ulp/isert/ib_isert.c
+++ b/drivers/infiniband/ulp/isert/ib_isert.c
@@ -1751,8 +1751,10 @@ isert_cq_tx_work(struct work_struct *work)
                        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_tx_comp_err(tx_desc, isert_conn);
+                       if (wc.wr_id != ISER_FASTREG_LI_WRID) {
+                               atomic_dec(&isert_conn->post_send_buf_count);
+                               isert_cq_tx_comp_err(tx_desc, isert_conn);
+                       }
                }
        }
 
@@ -2213,6 +2215,7 @@ 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;
@@ -2223,6 +2226,7 @@ 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;

diff --git a/drivers/infiniband/ulp/isert/ib_isert.h b/drivers/infiniband/ulp/isert/ib_isert.h
index 41e799f..10be55a 100644 (file)
--- a/drivers/infiniband/ulp/isert/ib_isert.h
+++ b/drivers/infiniband/ulp/isert/ib_isert.h
@@ -6,6 +6,7 @@
 
 #define ISERT_RDMA_LISTEN_BACKLOG      10
 #define ISCSI_ISER_SG_TABLESIZE                256
+#define ISER_FASTREG_LI_WRID           0xffffffffffffffffULL
 
 enum isert_desc_type {
        ISCSI_TX_CONTROL,