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[for-next,4/5] RDMA/ocrdma: Prevent CQ-Doorbell floods

Message ID 1445330880-3912-5-git-send-email-selvin.xavier@avagotech.com (mailing list archive)
State Accepted
Headers show

Commit Message

Selvin Xavier Oct. 20, 2015, 8:47 a.m. UTC 
From: Devesh Sharma <devesh.sharma@avagotech.com>

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>
Signed-off-by: Selvin Xavier <selvin.xavier@avagotech.com>
---
 drivers/infiniband/hw/ocrdma/ocrdma_verbs.c | 11 +++--------
 1 file changed, 3 insertions(+), 8 deletions(-)
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Patch

diff --git a/drivers/infiniband/hw/ocrdma/ocrdma_verbs.c b/drivers/infiniband/hw/ocrdma/ocrdma_verbs.c
index 1f3affb..1c4e83d 100644
--- a/drivers/infiniband/hw/ocrdma/ocrdma_verbs.c
+++ b/drivers/infiniband/hw/ocrdma/ocrdma_verbs.c
@@ -2933,16 +2933,11 @@  expand_cqe:
 	}
 stop_cqe:
 	cq->getp = cur_getp;
-	if (cq->deferred_arm) {
-		ocrdma_ring_cq_db(dev, cq->id, true, cq->deferred_sol,
-				  polled_hw_cqes);
+	if (cq->deferred_arm || polled_hw_cqes) {
+		ocrdma_ring_cq_db(dev, cq->id, cq->deferred_arm,
+				  cq->deferred_sol, polled_hw_cqes);
 		cq->deferred_arm = false;
 		cq->deferred_sol = false;
-	} else {
-		/* We need to pop the CQE. No need to arm */
-		ocrdma_ring_cq_db(dev, cq->id, false, cq->deferred_sol,
-				  polled_hw_cqes);
-		cq->deferred_sol = false;
 	}
 
 	return i;