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Commit 27ca34f5 authored by Steve Wise's avatar Steve Wise Committed by Roland Dreier
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RDMA/cxgb4: Fix accounting for unsignaled SQ WRs to deal with wrap 



When determining how many WRs are completed with a signaled CQE,
correctly deal with queue wraps.

Signed-off-by: default avatarSteve Wise <swise@opengridcomputing.com>
Signed-off-by: default avatarVipul Pandya <vipul@chelsio.com>
Signed-off-by: default avatarRoland Dreier <roland@purestorage.com>
parent 1cf24dce

drivers/infiniband/hw/cxgb4/cq.c

+5 −2
Original line number Diff line number Diff line
@@ -611,8 +611,11 @@ static int poll_cq(struct t4_wq *wq, struct t4_cq *cq, struct t4_cqe *cqe, 
		* to the first unsignaled one, and idx points to the

		* signaled one.  So adjust in_use based on this delta.

		* if this is not completing any unsigned wrs, then the

		* delta will be 0.

		* delta will be 0. Handle wrapping also!

		*/

		if (idx < wq->sq.cidx)

			wq->sq.in_use -= wq->sq.size + idx - wq->sq.cidx;

		else

			wq->sq.in_use -= idx - wq->sq.cidx;

		BUG_ON(wq->sq.in_use < 0 && wq->sq.in_use < wq->sq.size);