This is a note to let you know that I've just added the patch titled
RDMA/hns: Fix incorrect post-send with direct wqe of wr-list
to the 6.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
rdma-hns-fix-incorrect-post-send-with-direct-wqe-of-.patch
and it can be found in the queue-6.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit ee16a66135c939ea955f6d51fc2acd808077bf80
Author: Junxian Huang <huangjunxian6@xxxxxxxxxxxxx>
Date: Fri Aug 4 09:27:09 2023 +0800
RDMA/hns: Fix incorrect post-send with direct wqe of wr-list
[ Upstream commit 706efac4477cdb8be857f6322457de524acc02ff ]
Currently, direct wqe is not supported for wr-list. RoCE driver excludes
direct wqe for wr-list by judging whether the number of wr is 1.
For a wr-list where the second wr is a length-error atomic wr, the
post-send driver handles the first wr and adds 1 to the wr number counter
firstly. While handling the second wr, the driver finds out a length error
and terminates the wr handle process, remaining the counter at 1. This
causes the driver mistakenly judges there is only 1 wr and thus enters
the direct wqe process, carrying the current length-error atomic wqe.
This patch fixes the error by adding a judgement whether the current wr
is a bad wr. If so, use the normal doorbell process but not direct wqe
despite the wr number is 1.
Fixes: 01584a5edcc4 ("RDMA/hns: Add support of direct wqe")
Signed-off-by: Junxian Huang <huangjunxian6@xxxxxxxxxxxxx>
Link: https://lore.kernel.org/r/20230804012711.808069-3-huangjunxian6@xxxxxxxxxxxxx
Signed-off-by: Leon Romanovsky <leon@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/infiniband/hw/hns/hns_roce_hw_v2.c b/drivers/infiniband/hw/hns/hns_roce_hw_v2.c
index d4c6b9bc0a4ea..fe7908ed39022 100644
--- a/drivers/infiniband/hw/hns/hns_roce_hw_v2.c
+++ b/drivers/infiniband/hw/hns/hns_roce_hw_v2.c
@@ -757,7 +757,8 @@ static int hns_roce_v2_post_send(struct ib_qp *ibqp,
qp->sq.head += nreq;
qp->next_sge = sge_idx;
- if (nreq == 1 && (qp->en_flags & HNS_ROCE_QP_CAP_DIRECT_WQE))
+ if (nreq == 1 && !ret &&
+ (qp->en_flags & HNS_ROCE_QP_CAP_DIRECT_WQE))
write_dwqe(hr_dev, qp, wqe);
else
update_sq_db(hr_dev, qp);
