netdev - Re: [RFC PATCH net-next 10/15] net/sched: make stab available before ops->init() call

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Message-ID: <875ycqvp72.fsf@kurt>
Date:   Sat, 28 Jan 2023 13:06:09 +0100
From:   Kurt Kanzenbach <kurt@...utronix.de>
To:     Vladimir Oltean <vladimir.oltean@....com>, netdev@...r.kernel.org
Cc:     Vinicius Costa Gomes <vinicius.gomes@...el.com>
Subject: Re: [RFC PATCH net-next 10/15] net/sched: make stab available
 before ops->init() call

On Sat Jan 28 2023, Vladimir Oltean wrote:
> Some qdiscs like taprio turn out to be actually pretty reliant on a well
> configured stab, to not underestimate the skb transmission time (by
> properly accounting for L1 overhead).
>
> In a future change, taprio will need the stab, if configured by the
> user, to be available at ops->init() time.
>
> However, rcu_assign_pointer(sch->stab, stab) is called right after
> ops->init(), making it unavailable, and I don't really see a good reason
> for that.
>
> Move it earlier, which nicely seems to simplify the error handling path
> as well.
>
> Signed-off-by: Vladimir Oltean <vladimir.oltean@....com>

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

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