提交 27ca34f5 编写于 作者: S Steve Wise 提交者: Roland Dreier

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: NSteve Wise <swise@opengridcomputing.com>
Signed-off-by: NVipul Pandya <vipul@chelsio.com>
Signed-off-by: NRoland Dreier <roland@purestorage.com>
上级 1cf24dce
......@@ -611,9 +611,12 @@ 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!
*/
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;
......
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