netdev - Re: RFH, where did I go wrong?

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Message-ID: <ee967071-abbe-c0e3-db96-6963d1b886b2@gmail.com>
Date:   Wed, 12 Oct 2022 14:08:34 -0700
From:   Eric Dumazet <eric.dumazet@...il.com>
To:     Thorsten Glaser <t.glaser@...ent.de>
Cc:     Dave Taht <dave.taht@...il.com>, netdev@...r.kernel.org
Subject: Re: RFH, where did I go wrong?

On 10/12/22 14:05, Thorsten Glaser wrote:
> On Wed, 12 Oct 2022, Eric Dumazet wrote:
>
>> I guess RTNL is not held at this point.
> OIC, so it’s held for .init and .reset but not the other methods.
> I wish this were documented…

RTNL being a mutex it only can be acquired in process context.

qdisc fast path (queue/dequeue) can be called from (soft)irq context, so 
RTNL is out of reach.

>
> Looking good so far. Thank you very much!
>
> bye,
> //mirabilos