netdev - Re: [PATCH net-next 1/3] net/sched: taprio: fix calculation of maximum gate durations

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Message-ID: <87ilg2ot82.fsf@kurt>
Date:   Thu, 16 Feb 2023 10:27:41 +0100
From:   Kurt Kanzenbach <kurt@...utronix.de>
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>,
        Gerhard Engleder <gerhard@...leder-embedded.com>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH net-next 1/3] net/sched: taprio: fix calculation of
 maximum gate durations

On Thu Feb 16 2023, Vladimir Oltean wrote:
> taprio_calculate_gate_durations() depends on netdev_get_num_tc() and
> this returns 0. So it calculates the maximum gate durations for no
> traffic class.
>
> I had tested the blamed commit only with another patch in my tree, one
> which in the end I decided isn't valuable enough to submit ("net/sched:
> taprio: mask off bits in gate mask that exceed number of TCs").
>
> The problem is that having this patch threw off my testing. By moving
> the netdev_set_num_tc() call earlier, we implicitly gave to
> taprio_calculate_gate_durations() the information it needed.
>
> Extract only the portion from the unsubmitted change which applies the
> mqprio configuration to the netdev earlier.
>
> Link: https://patchwork.kernel.org/project/netdevbpf/patch/20230130173145.475943-15-vladimir.oltean@nxp.com/
> Fixes: a306a90c8ffe ("net/sched: taprio: calculate tc gate durations")
> Signed-off-by: Vladimir Oltean <vladimir.oltean@....com>

Reviewed-by: Kurt Kanzenbach <kurt@...utronix.de>

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