netdev - Re: [PATCH v2 net-next 3/6] net/sched: act

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Message-ID: <87sefkfujn.fsf@toke.dk>
Date: Wed, 15 Oct 2025 10:17:32 +0200
From: Toke Høiland-Jørgensen <toke@...hat.com>
To: Eric Dumazet <edumazet@...gle.com>, "David S . Miller"
 <davem@...emloft.net>, Jakub Kicinski <kuba@...nel.org>, Paolo Abeni
 <pabeni@...hat.com>
Cc: Simon Horman <horms@...nel.org>, Jamal Hadi Salim <jhs@...atatu.com>,
 Cong Wang <xiyou.wangcong@...il.com>, Jiri Pirko <jiri@...nulli.us>,
 Kuniyuki Iwashima <kuniyu@...gle.com>, Willem de Bruijn
 <willemb@...gle.com>, netdev@...r.kernel.org, eric.dumazet@...il.com, Eric
 Dumazet <edumazet@...gle.com>
Subject: Re: [PATCH v2 net-next 3/6] net/sched: act_mirred: add loop detection

Eric Dumazet <edumazet@...gle.com> writes:

> Commit 0f022d32c3ec ("net/sched: Fix mirred deadlock on device recursion")
> added code in the fast path, even when act_mirred is not used.
>
> Prepare its revert by implementing loop detection in act_mirred.
>
> Adds an array of device pointers in struct netdev_xmit.
>
> tcf_mirred_is_act_redirect() can detect if the array
> already contains the target device.
>
> Signed-off-by: Eric Dumazet <edumazet@...gle.com>

Reviewed-by: Toke Høiland-Jørgensen <toke@...hat.com>