linux-kernel - Re: [PATCH net-next 3/3] net/sched: taprio: dynamic max_sdu larger than the max

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Message-ID: <87cz6aot67.fsf@kurt>
Date:   Thu, 16 Feb 2023 10:28:48 +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 3/3] net/sched: taprio: dynamic max_sdu larger
 than the max_mtu is unlimited

On Thu Feb 16 2023, Vladimir Oltean wrote:
> It makes no sense to keep randomly large max_sdu values, especially if
> larger than the device's max_mtu. These are visible in "tc qdisc show".
> Such a max_sdu is practically unlimited and will cause no packets for
> that traffic class to be dropped on enqueue.
>
> Just set max_sdu_dynamic to U32_MAX, which in the logic below causes
> taprio to save a max_frm_len of U32_MAX and a max_sdu presented to user
> space of 0 (unlimited).
>
> Signed-off-by: Vladimir Oltean <vladimir.oltean@....com>

Doesn't this deserve a Fixes tag as well?

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