netdev - Re: [PATCH net v3] sch_htb: Avoid grafting on htb_destroy_class

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Date:   Fri, 13 Jan 2023 13:24:02 +0200
From:   Maxim Mikityanskiy <maxtram95@...il.com>
To:     Rahul Rameshbabu <rrameshbabu@...dia.com>
Cc:     netdev@...r.kernel.org, Tariq Toukan <tariqt@...dia.com>,
        Gal Pressman <gal@...dia.com>,
        Saeed Mahameed <saeedm@...dia.com>,
        Jamal Hadi Salim <jhs@...atatu.com>,
        Cong Wang <xiyou.wangcong@...il.com>,
        Jiri Pirko <jiri@...nulli.us>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        David Miller <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>
Subject: Re: [PATCH net v3] sch_htb: Avoid grafting on
 htb_destroy_class_offload when destroying htb

On Thu, Jan 12, 2023 at 04:55:29PM -0800, Rahul Rameshbabu wrote:
> Peek at old qdisc and graft only when deleting a leaf class in the htb,
> rather than when deleting the htb itself. Do not peek at the qdisc of the
> netdev queue when destroying the htb. The caller may already have grafted a
> new qdisc that is not part of the htb structure being destroyed.
> 
> This fix resolves two use cases.
> 
>   1. Using tc to destroy the htb.
>     - Netdev was being prematurely activated before the htb was fully
>       destroyed.
>   2. Using tc to replace the htb with another qdisc (which also leads to
>      the htb being destroyed).
>     - Premature netdev activation like previous case. Newly grafted qdisc
>       was also getting accidentally overwritten when destroying the htb.
> 
> Fixes: d03b195b5aa0 ("sch_htb: Hierarchical QoS hardware offload")
> Signed-off-by: Rahul Rameshbabu <rrameshbabu@...dia.com>
> Reviewed-by: Saeed Mahameed <saeedm@...dia.com>
> Cc: Eric Dumazet <edumazet@...gle.com>
> Cc: Maxim Mikityanskiy <maxtram95@...il.com>
> ---

Thanks, looks good to me!

Reviewed-by: Maxim Mikityanskiy <maxtram95@...il.com>