netdev - Re: Question about TC filter

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Date:   Wed, 5 Aug 2020 23:58:36 +0530
From:   satish dhote <sdhote926@...il.com>
To:     Jakub Kicinski <kuba@...nel.org>
Cc:     netdev@...r.kernel.org, xiyou.wangcong@...il.com, jiri@...nulli.us,
        jhs@...atatu.com, daniel@...earbox.net
Subject: Re: Question about TC filter

Hi Jakub,

Thanks for your response. Below are the OS and Kernel version I'm using.

OS: Ubuntu 20.04.1 LTS
Kernel Version: 5.4.0-42-generic

Thanks
Satish

On Wed, Aug 5, 2020 at 10:15 PM Jakub Kicinski <kuba@...nel.org> wrote:
>
> On Wed, 5 Aug 2020 11:08:08 +0530 satish dhote wrote:
> > Hi Team,
> >
> > I have a question regarding tc filter behavior. I tried to look
> > for the answer over the web and netdev FAQ but didn't get the
> > answer. Hence I'm looking for your help.
> >
> > I added ingress qdisc for interface enp0s25 and then configured the
> > tc filter as shown below, but after adding filters I realize that
> > rule is reflected as a result of both ingress and egress filter
> > command?  Is this the expected behaviour? or a bug? Why should the
> > same filter be reflected in both ingress and egress path?
> >
> > I understand that policy is always configured for ingress traffic,
> > so I believe that filters should not be reflected with egress.
> > Behaviour is same when I offloaded ovs flow to the tc software
> > datapath.
>
> I feel like this was discussed and perhaps fixed by:
>
> a7df4870d79b ("net_sched: fix tcm_parent in tc filter dump")
>
> What's your kernel version?