netdev - Re: [PATCH RFC net 1/1] net/sched: Fix mirred to self recursion

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Message-ID: <CAKa-r6tNMuAR0RXuGbYLFW0jhpbPn4BvW1erGcqu0nCLRzH-aA@mail.gmail.com>
Date: Tue, 16 Apr 2024 10:05:31 +0200
From: Davide Caratti <dcaratti@...hat.com>
To: Jamal Hadi Salim <jhs@...atatu.com>
Cc: Eric Dumazet <edumazet@...gle.com>, davem@...emloft.net, kuba@...nel.org, 
	pabeni@...hat.com, jiri@...nulli.us, xiyou.wangcong@...il.com, 
	netdev@...r.kernel.org, renmingshuai@...wei.com, 
	Victor Nogueira <victor@...atatu.com>
Subject: Re: [PATCH RFC net 1/1] net/sched: Fix mirred to self recursion

hello,

On Mon, Apr 15, 2024 at 11:15 PM Jamal Hadi Salim <jhs@...atatu.com> wrote:
>
[...]

> Victor sent the patch. As i mentioned earlier, we found a lockdep
> false positive for the case of redirect from eth0->eth1->eth0
> (potential fix attached)

I tried a similar approach some months ago [1],  but  _ like Eric
noticed  _ it might slowdown qdisc_destroy() too much because of the
call to synchronize_rcu(). Maybe the key unregistering can be done
later (e.g. when the qdisc is freed) ?

[1] https://lore.kernel.org/netdev/73065927a49619fcd60e5b765c929f899a66cd1a.1701853200.git.dcaratti@redhat.com/

-- 
davide