linux-kernel - [PATCH 2/3] RDMA/rxe: Update wqe_index for each wqe error completion

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Message-ID: <20220412022903.574238-2-lizhijian@fujitsu.com>
Date:   Tue, 12 Apr 2022 10:29:02 +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 2/3] RDMA/rxe: Update wqe_index for each wqe error completion

Previously, if user space keep sending abnormal wqe, qeueu.prod will
keep increasing while queue.index doesn't. Once
queue.index==qeueu.prod in next round, req_next_wqe() will treat queue
is empty. In such case, no new completion would be generated.

Update wqe_index for each wqe completion so that
req_next_wqe() can get next wqe properly.

Signed-off-by: Li Zhijian <lizhijian@...itsu.com>
---
 drivers/infiniband/sw/rxe/rxe_req.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/infiniband/sw/rxe/rxe_req.c b/drivers/infiniband/sw/rxe/rxe_req.c
index bf7493bab9b9..c369bebaf02e 100644
--- a/drivers/infiniband/sw/rxe/rxe_req.c
+++ b/drivers/infiniband/sw/rxe/rxe_req.c
@@ -760,6 +760,8 @@ int rxe_requester(void *arg)
 	if (ah)
 		rxe_put(ah);
 err:
+	/* update wqe_index for each wqe completion */
+	qp->req.wqe_index = queue_next_index(qp->sq.queue, qp->req.wqe_index);
 	wqe->state = wqe_state_error;
 	__rxe_do_task(&qp->comp.task);
 
-- 
2.31.1