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From:   Timo Rothenpieler <timo@rothenpieler.org>
To:     Linux NFS Mailing List <linux-nfs@vger.kernel.org>
Cc:     Chuck Lever <chuck.lever@oracle.com>,
        Olga Kornievskaia <aglo@umich.edu>,
        Dai Ngo <dai.ngo@oracle.com>,
        Timo Rothenpieler <timo@rothenpieler.org>
Subject: [PATCH] svcrdma: disable timeouts on rdma backchannel
Date:   Tue, 23 Feb 2021 00:36:19 +0100
Message-Id: <20210222233619.21568-1-timo@rothenpieler.org>
In-Reply-To: <C99EA5DE-814A-418B-9685-D400F4E7B964@oracle.com>
References: <C99EA5DE-814A-418B-9685-D400F4E7B964@oracle.com>
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This brings it in line with the regular tcp backchannel, which also has
all those timeouts disabled.

Prevents the backchannel from timing out, getting some async operations
like server side copying getting stuck indefinitely on the client side.

Signed-off-by: Timo Rothenpieler <timo@rothenpieler.org>
---
Did the same testing with this applied than before, and could not
observe it getting stuck, same as with the previous patch, which I
removed before testing this one.

This obviously still does not fix the issue of it being seemingly unable
to reestablish the disconnected backchannel.
An event that disconnects the backchannel but leaves the main connection
intact seems a pretty rare occurance though, outside of this issue.

 net/sunrpc/xprtrdma/svc_rdma_backchannel.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/net/sunrpc/xprtrdma/svc_rdma_backchannel.c b/net/sunrpc/xprtrdma/svc_rdma_backchannel.c
index 63f8be974df2..8186ab6f99f1 100644
--- a/net/sunrpc/xprtrdma/svc_rdma_backchannel.c
+++ b/net/sunrpc/xprtrdma/svc_rdma_backchannel.c
@@ -252,9 +252,9 @@ xprt_setup_rdma_bc(struct xprt_create *args)
 	xprt->timeout = &xprt_rdma_bc_timeout;
 	xprt_set_bound(xprt);
 	xprt_set_connected(xprt);
-	xprt->bind_timeout = RPCRDMA_BIND_TO;
-	xprt->reestablish_timeout = RPCRDMA_INIT_REEST_TO;
-	xprt->idle_timeout = RPCRDMA_IDLE_DISC_TO;
+	xprt->bind_timeout = 0;
+	xprt->reestablish_timeout = 0;
+	xprt->idle_timeout = 0;
 
 	xprt->prot = XPRT_TRANSPORT_BC_RDMA;
 	xprt->ops = &xprt_rdma_bc_procs;
-- 
2.25.1