netdev - Re: [PATCH net-next v3 5/5] act_mirred: use TC_ACT

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Message-ID: <20180725133021.GL2164@nanopsycho>
Date:   Wed, 25 Jul 2018 15:30:21 +0200
From:   Jiri Pirko <jiri@...nulli.us>
To:     Paolo Abeni <pabeni@...hat.com>
Cc:     Cong Wang <xiyou.wangcong@...il.com>,
        Linux Kernel Network Developers <netdev@...r.kernel.org>,
        Jamal Hadi Salim <jhs@...atatu.com>,
        Daniel Borkmann <daniel@...earbox.net>,
        Marcelo Ricardo Leitner <marcelo.leitner@...il.com>,
        Eyal Birger <eyal.birger@...il.com>,
        David Miller <davem@...emloft.net>
Subject: Re: [PATCH net-next v3 5/5] act_mirred: use TC_ACT_REINJECT when
 possible

Wed, Jul 25, 2018 at 12:14:32PM CEST, pabeni@...hat.com wrote:
>On Tue, 2018-07-24 at 14:15 -0700, Cong Wang wrote:
>> On Tue, Jul 24, 2018 at 1:07 PM Paolo Abeni <pabeni@...hat.com> wrote:
>> > +
>> > +               /* let's the caller reinject the packet, if possible */
>> > +               if (skb_at_tc_ingress(skb)) {
>> > +                       res->ingress = want_ingress;
>> > +                       res->qstats = this_cpu_ptr(m->common.cpu_qstats);
>> > +                       return TC_ACT_REINJECT;
>> > +               }
>> 
>> Looks good to me, but here we no longer return user-specified
>> return value here, I am sure it is safe for TC_ACT_STOLEN, but
>> I am not sure if it is safe for other values, like TC_ACT_RECLASSIFY.
>
>I can make it safer, using the no clone path only if tcf_action is
>TC_ACT_STOLEN. That will still cover the relevant use-cases.

That is a good idea. Thanks!


>
>Will do that in v4.
>
>Cheers,
>
>Paolo
>