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

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Date: Thu, 3 Aug 2023 14:21:07 -0300
From: Victor Nogueira <victor@...atatu.com>
To: Vladimir Oltean <vladimir.oltean@....com>, netdev@...r.kernel.org
Cc: "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 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).

cheers,
Victor