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RDMA/ocrdma: Prevent CQ-Doorbell floods

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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>
Signed-off-by: Doug Ledford <dledford@redhat.com>
This commit is contained in:
Devesh Sharma 2015-10-20 14:17:59 +05:30 committed by Doug Ledford
parent aeb922df2c
commit af74d1956f
1 changed files with 3 additions and 8 deletions
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11
drivers/infiniband/hw/ocrdma/ocrdma_verbs.c
View file

@ -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;