netdev - Re: [PATCH net-next] net/sched: store the last executed chain also for clsact egress

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Date:   Wed, 28 Jul 2021 15:16:02 -0700
From:   Cong Wang <xiyou.wangcong@...il.com>
To:     Davide Caratti <dcaratti@...hat.com>
Cc:     Jamal Hadi Salim <jhs@...atatu.com>, Jiri Pirko <jiri@...nulli.us>,
        Linux Kernel Network Developers <netdev@...r.kernel.org>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Marcelo Ricardo Leitner <marcelo.leitner@...il.com>,
        Alaa Hleilel <alaa@...dia.com>
Subject: Re: [PATCH net-next] net/sched: store the last executed chain also
 for clsact egress

On Wed, Jul 28, 2021 at 11:40 AM Davide Caratti <dcaratti@...hat.com> wrote:
>
> currently, only 'ingress' and 'clsact ingress' qdiscs store the tc 'chain
> id' in the skb extension. However, userspace programs (like ovs) are able
> to setup egress rules, and datapath gets confused in case it doesn't find
> the 'chain id' for a packet that's "recirculated" by tc.
> Change tcf_classify() to have the same semantic as tcf_classify_ingress()
> so that a single function can be called in ingress / egress, using the tc
> ingress / egress block respectively.

I wonder if there is any performance impact with this change? As
tcf_classify() now may allocate skb ext (tc_skb_ext_alloc()) too,
right after __tcf_classify().

Thanks.