netdev - Re: [PATCH net-next v3 4/5] net/tc: introduce TC_ACT

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Date:   Tue, 24 Jul 2018 13:50:44 -0700
From:   Cong Wang <xiyou.wangcong@...il.com>
To:     Paolo Abeni <pabeni@...hat.com>
Cc:     Linux Kernel Network Developers <netdev@...r.kernel.org>,
        Jamal Hadi Salim <jhs@...atatu.com>,
        Jiri Pirko <jiri@...nulli.us>,
        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 4/5] net/tc: introduce TC_ACT_REINJECT.

On Tue, Jul 24, 2018 at 1:38 PM Cong Wang <xiyou.wangcong@...il.com> wrote:
>
> On Tue, Jul 24, 2018 at 1:07 PM Paolo Abeni <pabeni@...hat.com> wrote:
> > +static inline void skb_tc_reinject(struct sk_buff *skb, struct tcf_result *res)
> > +{
> > +       struct gnet_stats_queue *stats = res->qstats;
> > +       int ret;
> > +
> > +       if (res->ingress)
> > +               ret = netif_receive_skb(skb);
> > +       else
> > +               ret = dev_queue_xmit(skb);
> > +       if (ret && stats)
> > +               qstats_overlimit_inc(res->qstats);
>
> Why increasing overlimit? Overlimit is typically increased
> by traffic shapers to indicate there is no bandwidth to send
> out the packet.
>
> I fail to understand why overlimit is increased in your case
> here. I guess you want to increase 'drops' instead.

Hmm, actually the current mirred code increases overlimit too.
But I still don't think it makes sense.