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

[Victor Nogueira]

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@xxxxxxx>
> Reviewed-by: Pedro Tammela <pctammela@xxxxxxxxxxxx>
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