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authorSteve Wise <swise@opengridcomputing.com>2013-08-06 15:34:36 (GMT)
committerRoland Dreier <roland@purestorage.com>2013-08-13 18:55:46 (GMT)
commit27ca34f54a70cb85895aa7147a6c35f1cd07fa55 (patch)
tree460c3cad1c580ce0070c8312c0311f982d6fffda /drivers/infiniband
parent1cf24dcef4e1dd0c34d8c39b09a9ce9a01accc72 (diff)
downloadlinux-27ca34f54a70cb85895aa7147a6c35f1cd07fa55.tar.xz
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 <swise@opengridcomputing.com> Signed-off-by: Vipul Pandya <vipul@chelsio.com> Signed-off-by: Roland Dreier <roland@purestorage.com>
Diffstat (limited to 'drivers/infiniband')
-rw-r--r--drivers/infiniband/hw/cxgb4/cq.c7
1 files 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;