linux-kernel - Re: [PATCH v3 net] udp: gso: do not drop small packets when PMTU reduces

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Message-Id: 
 <173857803108.3097404.4630945302894168269.git-patchwork-notify@kernel.org>
Date: Mon, 03 Feb 2025 10:20:31 +0000
From: patchwork-bot+netdevbpf@...nel.org
To: Yan Zhai <yan@...udflare.com>
Cc: netdev@...r.kernel.org, willemdebruijn.kernel@...il.com,
 davem@...emloft.net, dsahern@...nel.org, edumazet@...gle.com,
 kuba@...nel.org, pabeni@...hat.com, horms@...nel.org, shuah@...nel.org,
 johunt@...mai.com, alexander.h.duyck@...ux.intel.com,
 linux-kernel@...r.kernel.org, linux-kselftest@...r.kernel.org,
 kernel-team@...udflare.com
Subject: Re: [PATCH v3 net] udp: gso: do not drop small packets when PMTU reduces

Hello:

This patch was applied to netdev/net.git (main)
by David S. Miller <davem@...emloft.net>:

On Fri, 31 Jan 2025 00:31:39 -0800 you wrote:
> Commit 4094871db1d6 ("udp: only do GSO if # of segs > 1") avoided GSO
> for small packets. But the kernel currently dismisses GSO requests only
> after checking MTU/PMTU on gso_size. This means any packets, regardless
> of their payload sizes, could be dropped when PMTU becomes smaller than
> requested gso_size. We encountered this issue in production and it
> caused a reliability problem that new QUIC connection cannot be
> established before PMTU cache expired, while non GSO sockets still
> worked fine at the same time.
> 
> [...]

Here is the summary with links:
  - [v3,net] udp: gso: do not drop small packets when PMTU reduces
    https://git.kernel.org/netdev/net/c/235174b2bed8

You are awesome, thank you!
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