Re: [RESEDN PATCH mptcp-net] mptcp: update window_clamp on subflows when SO_RCVBUF is set

[Matthieu Baerts <matttbe@kernel.org>]

On 20/04/2026 11:31, gang.yan@linux.dev wrote:
> -------- Forwarded message -------
> 
> From: gang.yan@linux.dev mailto:gang.yan@linux.dev 
> To: "Matthieu Baerts" <matttbe@kernel.org mailto:matttbe@kernel.org?to=%22Matthieu%20Baerts%22%20%3Cmatttbe%40kernel.org%3E >
> Sent: April 20, 2026 at 5:30 PM
> Subject: Re: [RESEDN PATCH mptcp-net] mptcp: update window_clamp on subflows when SO_RCVBUF is set
> 
> April 20, 2026 at 5:24 PM, "Matthieu Baerts" <matttbe@kernel.org mailto:matttbe@kernel.org?to=%22Matthieu%20Baerts%22%20%3Cmatttbe%40kernel.org%3E > wrote:
> 
> 
> 
>>
>> Hi Gang,
>>  
>>  On 20/04/2026 10:56, Gang Yan wrote:
>>  
>>  
>>  From: Gang Yan <yangang@kylinos.cn>
>>  
>>  Add __mptcp_subflow_set_rcvbuf() helper that calls the tcp_set_rcvbuf
>>  to update window_clamp, in addition to writing sk_rcvbuf. Use it in
>>  both mptcp_sol_socket_sync_intval() (setsockopt path) and
>>  sync_socket_options() (new subflow creation path).
>>  
>>  I didn't review the code yet, but just a note for next time: please
>>  don't use the RESEND tag if you did a modification, even if it is only
>>  in the commit message. Instead, increment the version and add a
>>  changelog describing the modifications.
>>
> Thanks for the advice and reminder!
> 
> The reason I sent this patch with the RESEND tag is that I wanted to
> trigger the CI checks, especially the AI reivew, to see if there are any
> issues that need to be fixed. It seems my previous patch didn't properly
> trigger those tests.

Strange, I don't see your previous patch on Patchew:

  https://patchew.org/MPTCP/

And sashiko had some issues with it:


https://sashiko.dev/#/patchset/20260416122945.324166-1-gang.yan%40linux.dev

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