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Commit af74d195 authored by Devesh Sharma's avatar Devesh Sharma Committed by Doug Ledford
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RDMA/ocrdma: Prevent CQ-Doorbell floods 



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: default avatarDevesh Sharma <devesh.sharma@avagotech.com>
Signed-off-by: default avatarSelvin Xavier <selvin.xavier@avagotech.com>
Signed-off-by: default avatarDoug Ledford <dledford@redhat.com>
parent aeb922df

drivers/infiniband/hw/ocrdma/ocrdma_verbs.c

+3 −8
Original line number Diff line number Diff line
@@ -2933,16 +2933,11 @@ static int ocrdma_poll_hwcq(struct ocrdma_cq *cq, int num_entries, 
	}

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;