netdev - Re: [PATCH iproute2-next 1/4] man: get rid of doc/actions/mirred-usage

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Date: Mon, 15 Jan 2024 16:04:45 -0500
From: Jamal Hadi Salim <jhs@...atatu.com>
To: Jiri Pirko <jiri@...nulli.us>
Cc: Stephen Hemminger <stephen@...workplumber.org>, netdev@...r.kernel.org
Subject: Re: [PATCH iproute2-next 1/4] man: get rid of doc/actions/mirred-usage

On Fri, Jan 12, 2024 at 10:40 AM Jiri Pirko <jiri@...nulli.us> wrote:
>
> Fri, Jan 12, 2024 at 03:55:46PM CET, jhs@...atatu.com wrote:
> >On Fri, Jan 12, 2024 at 7:42 AM Jiri Pirko <jiri@...nulli.us> wrote:
> >>
> >> Thu, Jan 11, 2024 at 07:44:08PM CET, stephen@...workplumber.org wrote:
> >> >The only bit of information not already on the man page
> >> >is some of the limitations.
> >> >
> >>
> >> [...]
> >>
> >> >diff --git a/man/man8/tc-mirred.8 b/man/man8/tc-mirred.8
> >> >index 38833b452d92..71f3c93df472 100644
> >> >--- a/man/man8/tc-mirred.8
> >> >+++ b/man/man8/tc-mirred.8
> >> >@@ -94,6 +94,14 @@ interface, it is possible to send ingress traffic through an instance of
> >> > .EE
> >> > .RE
> >> >
> >> >+.SH LIMITIATIONS
> >> >+It is possible to create loops which will cause the kernel to hang.
> >>
> >> Hmm, I think this is not true for many many years. Perhaps you can drop
> >> it? Anyway, it was a kernel issue.
> >
> >Hmm back at you: why do you say it is not true anymore? It is still
>
> Ah, I was falsely under impression this happens in reclassify loop.
> Nevermind then.
>

The burden got shifted to mirred with view that it is the only action
that could cause a loop to happen.


cheers,
jamal

>
> >there - all in the marvelous name of saving 2 bits from the skb.
> >If you want to be the hero, here's the last attempt to fix this issue:
> >https://lore.kernel.org/netdev/20231215180827.3638838-1-victor@mojatatu.com/#t
> >
> >Stephen, please cc all the stakeholders when you make these changes.
> >Some of us dont have the luxury to be able to scan every message in
> >the list. I dont have time, at the moment, to review all the
> >documentation you are removing - but if you had Cc me i would have
> >made time.
> >
> >cheers,
> >jamal