linux-kernel - Re: [PATCH v3 net-next 09/10] selftests/tc-testing: test that taprio can only be attached as root

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Message-ID: <20230804111431.cjtj3kbcwhk5wcaf@skbuf>
Date:   Fri, 4 Aug 2023 14:14:31 +0300
From:   Vladimir Oltean <vladimir.oltean@....com>
To:     Victor Nogueira <victor@...atatu.com>
Cc:     netdev@...r.kernel.org, "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Jamal Hadi Salim <jhs@...atatu.com>,
        Cong Wang <xiyou.wangcong@...il.com>,
        Jiri Pirko <jiri@...nulli.us>,
        Vinicius Costa Gomes <vinicius.gomes@...el.com>,
        linux-kernel@...r.kernel.org, intel-wired-lan@...ts.osuosl.org,
        Muhammad Husaini Zulkifli <muhammad.husaini.zulkifli@...el.com>,
        Peilin Ye <yepeilin.cs@...il.com>,
        Pedro Tammela <pctammela@...atatu.com>,
        Richard Cochran <richardcochran@...il.com>,
        Zhengchao Shao <shaozhengchao@...wei.com>,
        Maxim Georgiev <glipus@...il.com>
Subject: Re: [PATCH v3 net-next 09/10] selftests/tc-testing: test that taprio
 can only be attached as root

On Thu, Aug 03, 2023 at 02:21:07PM -0300, Victor Nogueira wrote:
> On 01/08/2023 15:24, Vladimir Oltean wrote:
> > Check that the "Can only be attached as root qdisc" error message from
> > taprio is effective by attempting to attach it to a class of another
> > taprio qdisc. That operation should fail.
> > 
> > In the bug that was squashed by change "net/sched: taprio: try again to
> > report q->qdiscs[] to qdisc_leaf()", grafting a child taprio to a root
> > software taprio would be misinterpreted as a change() to the root
> > taprio. Catch this by looking at whether the base-time of the root
> > taprio has changed to follow the base-time of the child taprio,
> > something which should have absolutely never happened assuming correct
> > semantics.
> > 
> > Signed-off-by: Vladimir Oltean <vladimir.oltean@....com>
> > Reviewed-by: Pedro Tammela <pctammela@...atatu.com>
> If I understood correctly, these tests depend on CONFIG_PTP_1588_CLOCK_MOCK.
> If that is the case, you should add it to the tdc
> config file (tools/testing/selftests/tc-testing/config).

Thanks, will do.