netdev - Re: [PATCH net-next] net: sched: set dedicated tcf

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Date:   Tue, 26 Feb 2019 14:38:16 -0800
From:   Cong Wang <xiyou.wangcong@...il.com>
To:     Vlad Buslov <vladbu@...lanox.com>
Cc:     Linux Kernel Network Developers <netdev@...r.kernel.org>,
        Jamal Hadi Salim <jhs@...atatu.com>,
        Jiri Pirko <jiri@...nulli.us>,
        David Miller <davem@...emloft.net>
Subject: Re: [PATCH net-next] net: sched: set dedicated tcf_walker flag when
 tp is empty

On Tue, Feb 26, 2019 at 7:08 AM Vlad Buslov <vladbu@...lanox.com> wrote:
>
>
> On Mon 25 Feb 2019 at 22:52, Cong Wang <xiyou.wangcong@...il.com> wrote:
> > On Mon, Feb 25, 2019 at 7:38 AM Vlad Buslov <vladbu@...lanox.com> wrote:
> >>
> >> Using tcf_walker->stop flag to determine when tcf_walker->fn() was called
> >> at least once is unreliable. Some classifiers set 'stop' flag on error
> >> before calling walker callback, other classifiers used to call it with NULL
> >> filter pointer when empty. In order to prevent further regressions, extend
> >> tcf_walker structure with dedicated 'nonempty' flag. Set this flag in
> >> tcf_walker->fn() implementation that is used to check if classifier has
> >> filters configured.
> >
> >
> > So, after this patch commits like 31a998487641 ("net: sched: fw: don't
> > set arg->stop in fw_walk() when empty") can be reverted??
>
> Yes, it is safe now to revert following commits:
>
> 3027ff41f67c ("net: sched: route: don't set arg->stop in route4_walk() when empty")
> 31a998487641 ("net: sched: fw: don't set arg->stop in fw_walk() when empty")

Yeah, and probably commit d66022cd1623
("net: sched: matchall: verify that filter is not NULL in mall_walk()").

Please send a patch to revert them all.

Thanks.