6.4-stable review patch. If anyone has any objections, please let me know.
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From: Junxian Huang huangjunxian6@hisilicon.com
[ 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@hisilicon.com Link: https://lore.kernel.org/r/20230804012711.808069-3-huangjunxian6@hisilicon.co... Signed-off-by: Leon Romanovsky leon@kernel.org Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/infiniband/hw/hns/hns_roce_hw_v2.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-)
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);