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From: Chuck Lever <cel@kernel.org>
To: linux-nfs@vger.kernel.org, linux-rdma@vger.kernel.org
Subject: [PATCH v2 01/12] svcrdma: Reserve an extra WQE for ib_drain_rq()
Date: Sun, 04 Feb 2024 18:16:37 -0500	[thread overview]
Message-ID: <170708859782.28128.17719864297677716598.stgit@bazille.1015granger.net> (raw)
In-Reply-To: <170708844422.28128.2979813721958631192.stgit@bazille.1015granger.net>

From: Chuck Lever <chuck.lever@oracle.com>

Do as other ULPs already do: ensure there is an extra Receive WQE
reserved for the tear-down drain WR. I haven't heard reports of
problems but it can't hurt.

Note that rq_depth is used to compute the Send Queue depth as well,
so this fix should affect both the SQ and RQ.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
---
 net/sunrpc/xprtrdma/svc_rdma_transport.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/sunrpc/xprtrdma/svc_rdma_transport.c b/net/sunrpc/xprtrdma/svc_rdma_transport.c
index 4f27325ace4a..4a038c7e86f9 100644
--- a/net/sunrpc/xprtrdma/svc_rdma_transport.c
+++ b/net/sunrpc/xprtrdma/svc_rdma_transport.c
@@ -415,7 +415,7 @@ static struct svc_xprt *svc_rdma_accept(struct svc_xprt *xprt)
 	if (newxprt->sc_max_send_sges > dev->attrs.max_send_sge)
 		newxprt->sc_max_send_sges = dev->attrs.max_send_sge;
 	rq_depth = newxprt->sc_max_requests + newxprt->sc_max_bc_requests +
-		   newxprt->sc_recv_batch;
+		   newxprt->sc_recv_batch + 1 /* drain */;
 	if (rq_depth > dev->attrs.max_qp_wr) {
 		rq_depth = dev->attrs.max_qp_wr;
 		newxprt->sc_recv_batch = 1;



  reply	other threads:[~2024-02-04 23:16 UTC|newest]

Thread overview: 13+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2024-02-04 23:16 [PATCH v2 00/12] NFSD RDMA transport improvements Chuck Lever
2024-02-04 23:16 ` Chuck Lever [this message]
2024-02-04 23:16 ` [PATCH v2 02/12] svcrdma: Report CQ depths in debugging output Chuck Lever
2024-02-04 23:16 ` [PATCH v2 03/12] svcrdma: Update max_send_sges after QP is created Chuck Lever
2024-02-04 23:16 ` [PATCH v2 04/12] svcrdma: Increase the per-transport rw_ctx count Chuck Lever
2024-02-04 23:17 ` [PATCH v2 05/12] svcrdma: Fix SQ wake-ups Chuck Lever
2024-02-04 23:17 ` [PATCH v2 06/12] svcrdma: Prevent a UAF in svc_rdma_send() Chuck Lever
2024-02-04 23:17 ` [PATCH v2 07/12] svcrdma: Fix retry loop " Chuck Lever
2024-02-04 23:17 ` [PATCH v2 08/12] svcrdma: Post Send WR chain Chuck Lever
2024-02-04 23:17 ` [PATCH v2 09/12] svcrdma: Move write_info for Reply chunks into struct svc_rdma_send_ctxt Chuck Lever
2024-02-04 23:17 ` [PATCH v2 10/12] svcrdma: Post the Reply chunk and Send WR together Chuck Lever
2024-02-04 23:17 ` [PATCH v2 11/12] svcrdma: Post WRs for Write chunks in svc_rdma_sendto() Chuck Lever
2024-02-04 23:17 ` [PATCH v2 12/12] svcrdma: Add Write chunk WRs to the RPC's Send WR chain Chuck Lever

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