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

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Date:   Fri, 13 Jan 2023 15:23:58 +0100
From:   Jiri Pirko <jiri@...nulli.us>
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>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        David Miller <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Maxim Mikityanskiy <maxtram95@...il.com>
Subject: Re: [PATCH net v3] sch_htb: Avoid grafting on
 htb_destroy_class_offload when destroying htb

Fri, Jan 13, 2023 at 01:55:29AM CET, rrameshbabu@...dia.com 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>

Reviewed-by: Jiri Pirko <jiri@...dia.com>