netdev - Re: [PATCH iproute2-next 2/2] tc: add new attr TCA_EXT_WARN

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Date:   Sat, 14 Jan 2023 07:59:39 -0500
From:   Jamal Hadi Salim <jhs@...atatu.com>
To:     Stephen Hemminger <stephen@...workplumber.org>
Cc:     Hangbin Liu <liuhangbin@...il.com>, netdev@...r.kernel.org,
        Cong Wang <xiyou.wangcong@...il.com>,
        Jiri Pirko <jiri@...nulli.us>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        David Ahern <dsahern@...nel.org>
Subject: Re: [PATCH iproute2-next 2/2] tc: add new attr TCA_EXT_WARN_MSG

This is not really an error IMO (and therefore doesnt belong in
stderr). If i send a request to add an
entry and ask that it is installed both in the kernel as well as
offloaded into h/w and half of that
worked (example hardware rejected it for some reason) then the event
generated (as observed by
f.e. tc mon) will appear in TCA_EXT_WARN_MSG and the consumer of that
event needs to see it
if they are using the json format.

cheers,
jamal

On Thu, Jan 12, 2023 at 11:30 PM Stephen Hemminger
<stephen@...workplumber.org> wrote:
>
> On Fri, 13 Jan 2023 11:46:17 +0800
> Hangbin Liu <liuhangbin@...il.com> wrote:
>
> >       if (tb[TCA_EXT_WARN_MSG]) {
> > +             print_string(PRINT_ANY, "Warn", "%s ", rta_getattr_str(tb[TCA_EXT_WARN_MSG]));
> > +             print_nl();
> > +     }
> > +
>
> Errors should go to stderr, and not to stdout. And no JSON support please.