netdev - [PATCH net-next v2 v2 2/2] net: mctp: support MSG

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Message-Id: <20260116090032.1952063-1-zhangjian.3032@bytedance.com>
Date: Fri, 16 Jan 2026 17:00:32 +0800
From: "Jian Zhang" <zhangjian.3032@...edance.com>
To: "Jeremy Kerr" <jk@...econstruct.com.au>, 
	"Matt Johnston" <matt@...econstruct.com.au>, 
	"Andrew Lunn" <andrew+netdev@...n.ch>, 
	"David S. Miller" <davem@...emloft.net>, 
	"Eric Dumazet" <edumazet@...gle.com>, "Jakub Kicinski" <kuba@...nel.org>, 
	"Paolo Abeni" <pabeni@...hat.com>, <netdev@...r.kernel.org>, 
	<linux-kernel@...r.kernel.org>, <mkl@...gutronix.de>
Cc: "Simon Horman" <horms@...nel.org>
Subject: [PATCH net-next v2 v2 2/2] net: mctp: support MSG_ERRQUEUE in recvmsg()

This enables userspace to retrieve struct sock_extended_err for
locally detected transmit failures, using the standard socket
error queue mechanism.

At this point, only the generic errno information is reported.
No MCTP-specific control messages or extended error details are
provided.

Signed-off-by: Jian Zhang <zhangjian.3032@...edance.com>
---
 net/mctp/af_mctp.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/net/mctp/af_mctp.c b/net/mctp/af_mctp.c
index 209a963112e3..353599812a0a 100644
--- a/net/mctp/af_mctp.c
+++ b/net/mctp/af_mctp.c
@@ -291,9 +291,12 @@ static int mctp_recvmsg(struct socket *sock, struct msghdr *msg, size_t len,
 	u8 type;
 	int rc;
 
-	if (flags & ~(MSG_DONTWAIT | MSG_TRUNC | MSG_PEEK))
+	if (flags & ~(MSG_DONTWAIT | MSG_TRUNC | MSG_PEEK | MSG_ERRQUEUE))
 		return -EOPNOTSUPP;
 
+	if (flags & MSG_ERRQUEUE)
+		return sock_recv_errqueue(sk, msg, len, SOL_MCTP, 0);
+
 	skb = skb_recv_datagram(sk, flags, &rc);
 	if (!skb)
 		return rc;
-- 
2.20.1