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

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Message-ID: <CAAVpQUCmQWBUM6xNhz_oznOUXJOKV8Q8h_w-oLTZnsN6OaBnXA@mail.gmail.com>
Date: Tue, 14 Oct 2025 22:24:19 -0700
From: Kuniyuki Iwashima <kuniyu@...gle.com>
To: Eric Dumazet <edumazet@...gle.com>
Cc: "David S . Miller" <davem@...emloft.net>, Jakub Kicinski <kuba@...nel.org>, 
	Paolo Abeni <pabeni@...hat.com>, Simon Horman <horms@...nel.org>, 
	Jamal Hadi Salim <jhs@...atatu.com>, Cong Wang <xiyou.wangcong@...il.com>, 
	Jiri Pirko <jiri@...nulli.us>, Willem de Bruijn <willemb@...gle.com>, netdev@...r.kernel.org, 
	eric.dumazet@...il.com
Subject: Re: [PATCH v2 net-next 3/6] net/sched: act_mirred: add loop detection

On Tue, Oct 14, 2025 at 10:19 AM Eric Dumazet <edumazet@...gle.com> wrote:
>
> 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: Kuniyuki Iwashima <kuniyu@...gle.com>