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Date:   Wed, 2 Sep 2020 09:32:48 +0200
From:   Eric Dumazet <>
To:     Yunsheng Lin <>,
        Cong Wang <>
Cc:     Jamal Hadi Salim <>, Jiri Pirko <>,
        David Miller <>,
        Jakub Kicinski <>,
        Linux Kernel Network Developers <>,
        LKML <>,
Subject: Re: [PATCH net-next] net: sch_generic: aviod concurrent reset and
 enqueue op for lockless qdisc

On 9/1/20 11:34 PM, Yunsheng Lin wrote:

> I am not familiar with TCQ_F_CAN_BYPASS.
> From my understanding, the problem is that there is no order between
> qdisc enqueuing and qdisc reset.

Thw qdisc_reset() should be done after rcu grace period, when there is guarantee no enqueue is in progress.

qdisc_destroy() already has a qdisc_reset() call, I am not sure why qdisc_deactivate() is also calling qdisc_reset()

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