netdev - Re: [PATCH net v3] net/sched: cbs: Fix not adding cbs instance to list

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Date:   Mon, 23 Sep 2019 22:13:44 -0700
From:   Cong Wang <xiyou.wangcong@...il.com>
To:     Vinicius Costa Gomes <vinicius.gomes@...el.com>
Cc:     Linux Kernel Network Developers <netdev@...r.kernel.org>,
        Jamal Hadi Salim <jhs@...atatu.com>,
        Jiri Pirko <jiri@...nulli.us>,
        David Miller <davem@...emloft.net>
Subject: Re: [PATCH net v3] net/sched: cbs: Fix not adding cbs instance to list

On Mon, Sep 23, 2019 at 10:04 PM Vinicius Costa Gomes
<vinicius.gomes@...el.com> wrote:
>
> When removing a cbs instance when offloading is enabled, the crash
> below can be observed.
>
> The problem happens because that when offloading is enabled, the cbs
> instance is not added to the list.
>
> Also, the current code doesn't handle correctly the case when offload
> is disabled without removing the qdisc: if the link speed changes the
> credit calculations will be wrong. When we create the cbs instance
> with offloading enabled, it's not added to the notification list, when
> later we disable offloading, it's not in the list, so link speed
> changes will not affect it.
>
> The solution for both issues is the same, add the cbs instance being
> created unconditionally to the global list, even if the link state
> notification isn't useful "right now".
>
...
> Fixes: e0a7683 ("net/sched: cbs: fix port_rate miscalculation")
> Signed-off-by: Vinicius Costa Gomes <vinicius.gomes@...el.com>

Acked-by: Cong Wang <xiyou.wangcong@...il.com>