netdev - Re: [PATCH net-next 4/4] net/sched: act_mirred: Implement ingress actions

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Message-ID: <4387324a-de66-aa1b-86f0-1a9a2f8294f5@mojatatu.com>
Date:   Thu, 22 Sep 2016 19:40:15 -0400
From:   Jamal Hadi Salim <jhs@...atatu.com>
To:     Shmulik Ladkani <shmulik.ladkani@...ellosystems.com>,
        "David S. Miller" <davem@...emloft.net>
Cc:     WANG Cong <xiyou.wangcong@...il.com>,
        Eric Dumazet <edumazet@...gle.com>, netdev@...r.kernel.org,
        Shmulik Ladkani <shmulik.ladkani@...il.com>
Subject: Re: [PATCH net-next 4/4] net/sched: act_mirred: Implement ingress
 actions

On 16-09-22 09:21 AM, Shmulik Ladkani wrote:
> From: Shmulik Ladkani <shmulik.ladkani@...il.com>
>
> Up until now, 'action mirred' supported only egress actions (either
> TCA_EGRESS_REDIR or TCA_EGRESS_MIRROR).
>
> This patch implements the corresponding ingress actions
> TCA_INGRESS_REDIR and TCA_INGRESS_MIRROR.
>
> This allows attaching filters whose target is to hand matching skbs into
> the rx processing of a specified device.
>

Thank you for doing this. There was something that made me remove
initial support for this feature - I am blanking out right now but
will find my notes and give more details. It may be around preventing
loops maybe. If that was the thought then:
I am just wondering is there a use case for a packet that is redirected
from egress ethx to ingress of ethy that then requires ingress of ethy
classify? Otherwise you could just set the "dont classify" flag.
i.e SET_TC_NCLS()

cheers,
jamal