netdev - [6.14][mlx5] bug with wireguard and rx-gro-list FYI

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Message-ID: <CAA85sZsxTsHq0bbrnRwbD9XmUzFk4s5Loabpmqyw7hipyTcUDQ@mail.gmail.com>
Date: Mon, 24 Mar 2025 23:03:58 +0100
From: Ian Kumlien <ian.kumlien@...il.com>
To: Linux Kernel Network Developers <netdev@...r.kernel.org>
Cc: saeedm@...dia.com
Subject: [6.14][mlx5] bug with wireguard and rx-gro-list FYI

Hi,

I have been wondering why my wireguard connection to another part of
the building became extremely slow
and almost unusable - even issuing "dmesg" was so slow that you saw it
update in chunks and it took a long, long time
to complete.

Well, eventually you get fed up and angry, so a wireshark session
reveals that there is lost packets and ALOT of retransmissions....

It turns out that disabling rx-gro-list on the external interface
fixes it... Everything is now fast again!
(I had a leftover script enabling it for my old config, turns out that
i didn't disable it as i thought after all)

Anyway, FYI, enabling it causes issues with mlx5...