RDMA/cxgb4: Ignore read reponse type 1 CQEs

These are generated by HW in some error cases and need to be
silently discarded.

Signed-off-by: Steve Wise <swise@opengridcomputing.com>
Signed-off-by: Roland Dreier <roland@purestorage.com>

1 files changed, 20 insertions, 4 deletions

diff --git a/drivers/infiniband/hw/cxgb4/cq.c b/drivers/infiniband/hw/cxgb4/cq.c
index d6a7db2c42f6..ce468e542428 100644
--- a/drivers/infiniband/hw/cxgb4/cq.c
+++ b/drivers/infiniband/hw/cxgb4/cq.c
@@ -365,8 +365,14 @@ void c4iw_flush_hw_cq(struct c4iw_cq *chp)
 
                 if (CQE_OPCODE(hw_cqe) == FW_RI_READ_RESP) {
 
-                        /*
-                         * drop peer2peer RTR reads.
+                        /* If we have reached here because of async
+                         * event or other error, and have egress error
+                         * then drop
+                         */
+                        if (CQE_TYPE(hw_cqe) == 1)
+                                goto next_cqe;
+
+                        /* drop peer2peer RTR reads.
                          */
                         if (CQE_WRID_STAG(hw_cqe) == 1)
                                 goto next_cqe;
@@ -511,8 +517,18 @@ static int poll_cq(struct t4_wq *wq, struct t4_cq *cq, struct t4_cqe *cqe,
          */
         if (RQ_TYPE(hw_cqe) && (CQE_OPCODE(hw_cqe) == FW_RI_READ_RESP)) {
 
-                /*
-                 * If this is an unsolicited read response, then the read
+                /* If we have reached here because of async
+                 * event or other error, and have egress error
+                 * then drop
+                 */
+                if (CQE_TYPE(hw_cqe) == 1) {
+                        if (CQE_STATUS(hw_cqe))
+                                t4_set_wq_in_error(wq);
+                        ret = -EAGAIN;
+                        goto skip_cqe;
+                }
+
+                /* If this is an unsolicited read response, then the read
                  * was generated by the kernel driver as part of peer-2-peer
                  * connection setup.  So ignore the completion.
                  */