netdev - Re: [RFC PATCH] net: enable SO_REUSEPORT for AF

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Message-ID: <318ad96d-99ba-4c53-a08d-7f257dbc3d6a@suse.com>
Date: Wed, 12 Mar 2025 18:44:10 +0100
From: Nicolas Morey <nicolas.morey@...e.com>
To: Kuniyuki Iwashima <kuniyu@...zon.com>
Cc: edumazet@...gle.com, netdev@...r.kernel.org
Subject: Re: [RFC PATCH] net: enable SO_REUSEPORT for AF_TIPC sockets

On 2025-03-12 17:35, Kuniyuki Iwashima wrote:
> From: Nicolas Morey <nicolas.morey@...e.com>
> Date: Wed, 12 Mar 2025 14:48:01 +0100
>> Commit 5b0af621c3f6 ("net: restrict SO_REUSEPORT to inet sockets") disabled
>> SO_REUSEPORT for all non inet sockets, including AF_TIPC sockets which broke
>> one of our customer applications.
>> Re-enable SO_REUSEPORT for AF_TIPC to restore the original behaviour.
> 
> AFAIU, AF_TIPC does not actually implement SO_REUSEPORT logic, no ?
> If so, please tell your customer not to set it on AF_TIPC sockets.
> 
> There were similar reports about AF_VSOCK and AF_UNIX, and we told
> that the userspace should not set SO_REUSEPORT for such sockets
> that do not support the option.
> 
> https://lore.kernel.org/stable/CAGxU2F57EgVGbPifRuCvrUVjx06mrOXNdLcPdqhV9bdM0VqGvg@mail.gmail.com/
> https://github.com/amazonlinux/amazon-linux-2023/issues/901
> 
> 
Isn't the sk_reuseport inherited/used by the underlying UDP socket ?

Nicolas