linux-kernel - [PATCH v2 2/2] RDMA/rxe: Generate error completion for error requester state

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Message-ID: <20220511023030.229212-3-lizhijian@fujitsu.com>
Date:   Wed, 11 May 2022 10:30:30 +0800
From:   Li Zhijian <lizhijian@...itsu.com>
To:     Zhu Yanjun <zyjzyj2000@...il.com>, Jason Gunthorpe <jgg@...pe.ca>,
        <linux-rdma@...r.kernel.org>
CC:     <linux-kernel@...r.kernel.org>, Li Zhijian <lizhijian@...itsu.com>
Subject: [PATCH v2 2/2] RDMA/rxe: Generate error completion for error requester state

SoftRoCE always returns success when user space is posting a new wqe where
it usually just enqueues a wqe.

Once the requester state becomes QP_STATE_ERROR, we should generate error
completion for all subsequent wqe. So the user is able to poll the
completion event to check if the former wqe is handled correctly.

Here we check QP_STATE_ERROR after req_next_wqe() so that the completion
can associate with its wqe.

Signed-off-by: Li Zhijian <lizhijian@...itsu.com>
---
 drivers/infiniband/sw/rxe/rxe_req.c | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/drivers/infiniband/sw/rxe/rxe_req.c b/drivers/infiniband/sw/rxe/rxe_req.c
index 8bdd0b6b578f..ed6a486c4343 100644
--- a/drivers/infiniband/sw/rxe/rxe_req.c
+++ b/drivers/infiniband/sw/rxe/rxe_req.c
@@ -624,7 +624,7 @@ int rxe_requester(void *arg)
 	rxe_get(qp);
 
 next_wqe:
-	if (unlikely(!qp->valid || qp->req.state == QP_STATE_ERROR))
+	if (unlikely(!qp->valid))
 		goto exit;
 
 	if (unlikely(qp->req.state == QP_STATE_RESET)) {
@@ -646,6 +646,14 @@ int rxe_requester(void *arg)
 	if (unlikely(!wqe))
 		goto exit;
 
+	if (qp->req.state == QP_STATE_ERROR) {
+		/*
+		 * Generate an error completion so that user space is able to
+		 * poll this completion.
+		 */
+		goto err;
+	}
+
 	if (wqe->mask & WR_LOCAL_OP_MASK) {
 		ret = rxe_do_local_ops(qp, wqe);
 		if (unlikely(ret))
-- 
2.31.1