linux-kernel - Re: [PATCH net-next] tcp: socket option to check for MPTCP fallback to TCP

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Date: Mon, 13 May 2024 22:00:30 +0000
From: patchwork-bot+netdevbpf@...nel.org
To: Matthieu Baerts (NGI0) <matttbe@...nel.org>
Cc: mptcp@...ts.linux.dev, edumazet@...gle.com, davem@...emloft.net,
 dsahern@...nel.org, kuba@...nel.org, pabeni@...hat.com, martineau@...nel.org,
 geliang@...nel.org, netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH net-next] tcp: socket option to check for MPTCP fallback to
 TCP

Hello:

This patch was applied to netdev/net-next.git (main)
by Jakub Kicinski <kuba@...nel.org>:

On Thu, 09 May 2024 20:10:10 +0200 you wrote:
> A way for an application to know if an MPTCP connection fell back to TCP
> is to use getsockopt(MPTCP_INFO) and look for errors. The issue with
> this technique is that the same errors -- EOPNOTSUPP (IPv4) and
> ENOPROTOOPT (IPv6) -- are returned if there was a fallback, *or* if the
> kernel doesn't support this socket option. The userspace then has to
> look at the kernel version to understand what the errors mean.
> 
> [...]

Here is the summary with links:
  - [net-next] tcp: socket option to check for MPTCP fallback to TCP
    https://git.kernel.org/netdev/net-next/c/c084ebd77a00

You are awesome, thank you!
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