netdev - [PATCH net-next] net/smc: return ETIMEDOUT when smc_connect

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Date:   Tue, 15 Feb 2022 16:24:50 +0800
From:   "D. Wythe" <alibuda@...ux.alibaba.com>
To:     kgraul@...ux.ibm.com
Cc:     kuba@...nel.org, davem@...emloft.net, netdev@...r.kernel.org,
        linux-s390@...r.kernel.org, linux-rdma@...r.kernel.org
Subject: [PATCH net-next] net/smc: return ETIMEDOUT when smc_connect_clc() timeout

From: "D. Wythe" <alibuda@...ux.alibaba.com>

When smc_connect_clc() times out, it will return -EAGAIN(tcp_recvmsg
retuns -EAGAIN while timeout), then this value will passed to the
application, which is quite confusing to the applications, makes
inconsistency with TCP.

>From the manual of connect, ETIMEDOUT is more suitable, and this patch
try convert EAGAIN to ETIMEDOUT in that case.

Signed-off-by: D. Wythe <alibuda@...ux.alibaba.com>
---
 net/smc/af_smc.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/net/smc/af_smc.c b/net/smc/af_smc.c
index 246c874..38a4064 100644
--- a/net/smc/af_smc.c
+++ b/net/smc/af_smc.c
@@ -1372,8 +1372,14 @@ static int __smc_connect(struct smc_sock *smc)
 
 	/* perform CLC handshake */
 	rc = smc_connect_clc(smc, aclc2, ini);
-	if (rc)
+	if (rc) {
+		/* -EAGAIN on timeout, see tcp_recvmsg() */
+		if (rc == -EAGAIN) {
+			rc = -ETIMEDOUT;
+			smc->sk.sk_err = ETIMEDOUT;
+		}
 		goto vlan_cleanup;
+	}
 
 	/* check if smc modes and versions of CLC proposal and accept match */
 	rc = smc_connect_check_aclc(ini, aclc);
-- 
1.8.3.1