linux-kernel - [PATCH net-next 07/15] mptcp: allow overridden write

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Message-Id: <20260203-net-next-mptcp-misc-feat-6-20-v1-7-31ec8bfc56d1@kernel.org>
Date: Tue, 03 Feb 2026 19:41:23 +0100
From: "Matthieu Baerts (NGI0)" <matttbe@...nel.org>
To: Mat Martineau <martineau@...nel.org>, Geliang Tang <geliang@...nel.org>, 
 "David S. Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>, 
 Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>, 
 Simon Horman <horms@...nel.org>, Shuah Khan <shuah@...nel.org>
Cc: netdev@...r.kernel.org, mptcp@...ts.linux.dev, 
 linux-kernel@...r.kernel.org, linux-kselftest@...r.kernel.org, 
 "Matthieu Baerts (NGI0)" <matttbe@...nel.org>, 
 Gang Yan <yangang@...inos.cn>, Geliang Tang <geliang@...nel.org>
Subject: [PATCH net-next 07/15] mptcp: allow overridden write_space to be
 invoked

From: Geliang Tang <tanggeliang@...inos.cn>

Future extensions with psock will override their own sk->sk_write_space
callback. This patch ensures that the overridden sk_write_space can be
invoked by MPTCP.

INDIRECT_CALL is used to keep the default path optimised.

This patch is shared early to ease discussions around future RFC and
avoid confusions with this "fix" that is needed for different future
extensions.

Suggested-by: Paolo Abeni <pabeni@...hat.com>
Co-developed-by: Gang Yan <yangang@...inos.cn>
Signed-off-by: Gang Yan <yangang@...inos.cn>
Signed-off-by: Geliang Tang <tanggeliang@...inos.cn>
Reviewed-by: Matthieu Baerts (NGI0) <matttbe@...nel.org>
Signed-off-by: Matthieu Baerts (NGI0) <matttbe@...nel.org>
---
 net/mptcp/protocol.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/mptcp/protocol.h b/net/mptcp/protocol.h
index f4bfe91ca7f9..0bd1ee860316 100644
--- a/net/mptcp/protocol.h
+++ b/net/mptcp/protocol.h
@@ -975,7 +975,7 @@ static inline void mptcp_write_space(struct sock *sk)
 	/* pairs with memory barrier in mptcp_poll */
 	smp_mb();
 	if (mptcp_stream_memory_free(sk, 1))
-		sk_stream_write_space(sk);
+		INDIRECT_CALL_1(sk->sk_write_space, sk_stream_write_space, sk);
 }

 static inline void __mptcp_sync_sndbuf(struct sock *sk)

-- 
2.51.0