From af74d1956f780253d643a15f30d6aaa1c2e4836d Mon Sep 17 00:00:00 2001 From: Devesh Sharma Date: Tue, 20 Oct 2015 14:17:59 +0530 Subject: [PATCH] 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: Devesh Sharma Signed-off-by: Selvin Xavier Signed-off-by: Doug Ledford --- drivers/infiniband/hw/ocrdma/ocrdma_verbs.c | 11 +++-------- 1 file changed, 3 insertions(+), 8 deletions(-) diff --git a/drivers/infiniband/hw/ocrdma/ocrdma_verbs.c b/drivers/infiniband/hw/ocrdma/ocrdma_verbs.c index 1f3affb6a477..1c4e83d5d153 100644 --- a/drivers/infiniband/hw/ocrdma/ocrdma_verbs.c +++ b/drivers/infiniband/hw/ocrdma/ocrdma_verbs.c @@ -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; -- GitLab