netdev - Re: inter-qdisc communication?

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Date:   Mon, 29 Aug 2022 09:18:19 -0700
From:   Dave Taht <dave.taht@...il.com>
To:     Thorsten Glaser <t.glaser@...ent.de>
Cc:     Linux Kernel Network Developers <netdev@...r.kernel.org>
Subject: Re: inter-qdisc communication?

On Mon, Aug 29, 2022 at 9:08 AM Thorsten Glaser <t.glaser@...ent.de> wrote:
>
> On Mon, 29 Aug 2022, Thorsten Glaser wrote:
>
> > All references to ifb seem to cargo-cult the following filter…
> >
> >       protocol ip u32 match u32 0 0 flowid 1:1
> >        action mirred egress redirect dev ifb0
>
> > I require any and all traffic of all protocols to be redirected.
> > Not just IPv4, and not just traffic that matches anything. Can I
> > do that with the filter, and will this “trick” get me the effect
> > I want to have?
>
> https://wiki.gentoo.org/wiki/Traffic_shaping#Traffic_Shaping_Script
> has “protocol all” but there is still a filter required? Looking at
> net/sched/cls_u32.c this is _quite_ an amount of code involved; is
> there really no pass-all? Maybe it’s time to write one…

In general I would really like to simplify the ingress path within the
kernel for common cases. My dream has been, of course, to be able to
do this:

tc qdisc add dev eth0 ingress cake bandwidth 40Mbit.

without needing a filter, mirred, and especially, have it remain multicore.


> bye,
> //mirabilos
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-- 
FQ World Domination pending: https://blog.cerowrt.org/post/state_of_fq_codel/
Dave Täht CEO, TekLibre, LLC