Patch "RDMA/hns: Fix incorrect post-send with direct wqe of wr-list" has been added to the 6.5-stable tree

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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 6.5-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-6.5 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.



commit 6373acaf89ba9f96a636ab033ebbb8c93320e707
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 8f7eb11066b43..f95551b6d4072 100644
--- a/drivers/infiniband/hw/hns/hns_roce_hw_v2.c
+++ b/drivers/infiniband/hw/hns/hns_roce_hw_v2.c
@@ -750,7 +750,8 @@ 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);



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