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

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Message-ID: <CAM_iQpUHjoohcMgXd8y9GVn8hdFwMRGJeCJ5wSfphModf0qZ-A@mail.gmail.com>
Date:   Tue, 24 Jul 2018 13:38:29 -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 1:07 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.