linux-kernel - [PATCH 3/3] RDMA/rxe: Generate error completion for error requester state

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Message-ID: <20220412022903.574238-3-lizhijian@fujitsu.com>
Date:   Tue, 12 Apr 2022 10:29:03 +0800
From:   Li Zhijian <lizhijian@...itsu.com>
To:     <zyjzyj2000@...il.com>, <jgg@...pe.ca>,
        <linux-rdma@...r.kernel.org>
CC:     <linux-kernel@...r.kernel.org>, Li Zhijian <lizhijian@...itsu.com>
Subject: [PATCH 3/3] 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 euqueues a wqe.

Once requester state becomes QP_STATE_ERROR, we should generate error
completion for all subsequent wqe. So 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 c369bebaf02e..9b35f6528d73 100644
--- a/drivers/infiniband/sw/rxe/rxe_req.c
+++ b/drivers/infiniband/sw/rxe/rxe_req.c
@@ -611,7 +611,7 @@ 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)) {
@@ -633,6 +633,14 @@ 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