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

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Message-ID: <8037fb73-4e18-4ed1-9eaf-e4cd8b2c9d53@kernel.org>
Date: Wed, 4 Feb 2026 11:47:13 +0100
From: Matthieu Baerts <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,
 Gang Yan <yangang@...inos.cn>
Subject: Re: [PATCH net-next 07/15] mptcp: allow overridden write_space to be
 invoked

Hello,

On 03/02/2026 19:41, Matthieu Baerts (NGI0) wrote:
> 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);

Is it possible to drop only this patch from this series? It is
independent of the rest, and the AI review tool spotted that
sk->sk_write_space is not sk_stream_write_space by default.

I can send a v2 without this patch if preferred.

>  }
>  
>  static inline void __mptcp_sync_sndbuf(struct sock *sk)
> 

Cheers,
Matt
-- 
Sponsored by the NGI0 Core fund.