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[3/4] RDMA/libocrdma: Prevent CQ-Doorbell floods

Message ID 1446446245-534-4-git-send-email-devesh.sharma@avagotech.com (mailing list archive)
State Not Applicable
Headers show

Commit Message

Devesh Sharma Nov. 2, 2015, 6:37 a.m. UTC 
Changing CQ-Doorbell(DB) logic to prevent DB floods, it is supposed to be
pressed only if any hw CQE is polled. If cq-arm was requested
previously then don't bother about number of hw CQEs polled and
arm the CQ.

Signed-off-by: Devesh Sharma <devesh.sharma@avagotech.com>
---
 src/ocrdma_verbs.c | 9 +++------
 1 file changed, 3 insertions(+), 6 deletions(-)
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Patch

diff --git a/src/ocrdma_verbs.c b/src/ocrdma_verbs.c
index d80ab27..cf6f72c 100644
--- a/src/ocrdma_verbs.c
+++ b/src/ocrdma_verbs.c
@@ -2003,14 +2003,11 @@  expand_cqe:
 	}
 stop_cqe:
 	cq->getp = cur_getp;
-	if (cq->deferred_arm) {
-		ocrdma_ring_cq_db(cq, 1, cq->deferred_sol, polled_hw_cqes);
+	if (cq->deferred_arm || polled_hw_cqes) {
+		ocrdma_ring_cq_db(cq, cq->deferred_arm,
+				  cq->deferred_sol, polled_hw_cqes);
 		cq->deferred_arm = 0;
 		cq->deferred_sol = 0;
-	} else {
-		/* We need to pop the CQE. No need to arm */
-		ocrdma_ring_cq_db(cq, 0, cq->deferred_sol, polled_hw_cqes);
-		cq->deferred_sol = 0;
 	}
 
 	return i;