From 27ca34f54a70cb85895aa7147a6c35f1cd07fa55 Mon Sep 17 00:00:00 2001 From: Steve Wise Date: Tue, 6 Aug 2013 21:04:36 +0530 Subject: [PATCH] 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: Steve Wise Signed-off-by: Vipul Pandya Signed-off-by: Roland Dreier --- drivers/infiniband/hw/cxgb4/cq.c | 7 +++++-- 1 file changed, 5 insertions(+), 2 deletions(-) diff --git a/drivers/infiniband/hw/cxgb4/cq.c b/drivers/infiniband/hw/cxgb4/cq.c index 6657390..88de3aa 100644 --- a/drivers/infiniband/hw/cxgb4/cq.c +++ b/drivers/infiniband/hw/cxgb4/cq.c @@ -611,9 +611,12 @@ proc_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! */ - wq->sq.in_use -= idx - wq->sq.cidx; + 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); wq->sq.cidx = (uint16_t)idx; -- 2.7.4