netdev - [PATCHv4 net-next 19/32] iw_cxgb4: ignore read reponse type 1 CQEs

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Message-Id: <1394188409-9739-20-git-send-email-hariprasad@chelsio.com>
Date:	Fri,  7 Mar 2014 16:03:16 +0530
From:	Hariprasad Shenai <hariprasad@...lsio.com>
To:	netdev@...r.kernel.org, linux-rdma@...r.kernel.org
Cc:	davem@...emloft.net, roland@...estorage.com, santosh@...lsio.com,
	dm@...lsio.com, kumaras@...lsio.com, swise@...ngridcomputing.com,
	leedom@...lsio.com, nirranjan@...lsio.com, hariprasad@...lsio.com
Subject: [PATCHv4 net-next 19/32] iw_cxgb4: ignore read reponse type 1 CQEs

From: Steve Wise <swise@...ngridcomputing.com>

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

Signed-off-by: Steve Wise <swise@...ngridcomputing.com>
---
 drivers/infiniband/hw/cxgb4/cq.c | 24 ++++++++++++++++++++----
 1 file changed, 20 insertions(+), 4 deletions(-)

diff --git a/drivers/infiniband/hw/cxgb4/cq.c b/drivers/infiniband/hw/cxgb4/cq.c
index 59f7601..55f7157 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.
 		 */
-- 
1.8.4

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