netdev - Re: [PATCH net-next v2 13/13] bnxt_en: Add support for ntuple filter deletion by ethtool.

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Date: Thu, 4 Jan 2024 15:37:05 -0800
From: Michael Chan <michael.chan@...adcom.com>
To: Jakub Kicinski <kuba@...nel.org>
Cc: davem@...emloft.net, netdev@...r.kernel.org, edumazet@...gle.com, 
	pabeni@...hat.com, pavan.chebbi@...adcom.com, andrew.gospodarek@...adcom.com
Subject: Re: [PATCH net-next v2 13/13] bnxt_en: Add support for ntuple filter
 deletion by ethtool.

On Thu, Jan 4, 2024 at 2:59 PM Jakub Kicinski <kuba@...nel.org> wrote:
>
> On Fri, 22 Dec 2023 20:22:10 -0800 Michael Chan wrote:
> > +     if (fltr_base) {
> > +             struct bnxt_ntuple_filter *fltr;
> > +
> > +             fltr = container_of(fltr_base, struct bnxt_ntuple_filter, base);
> > +             rcu_read_unlock();
> > +             if (!(fltr->base.flags & BNXT_ACT_NO_AGING))
> > +                     return -EINVAL;
>
> This looks pretty suspicious, you drop the RCU lock before ever using
> the object. I'm guessing the filter may be form aRFS and that's why
> we need RCU? Shouldn't you hold the RCU lock when checking that
> NO_AGING is set? If it's an aRFS flow it may disappear..

I think you are right.  The RCU lock should be released after checking
the flags.

There is also another unused variable detected by the kernel test
robot.  I will post the fixes in a day or two.  Thanks.

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