netdev - Re: [patch net-next RFC] net: sched: don't dump chains only held by actions

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Date:   Fri, 27 Jul 2018 08:13:54 +0200
From:   Jiri Pirko <jiri@...nulli.us>
To:     Cong Wang <xiyou.wangcong@...il.com>
Cc:     Linux Kernel Network Developers <netdev@...r.kernel.org>,
        David Miller <davem@...emloft.net>,
        Jamal Hadi Salim <jhs@...atatu.com>, mlxsw@...lanox.com
Subject: Re: [patch net-next RFC] net: sched: don't dump chains only held by
 actions

Fri, Jul 27, 2018 at 06:18:14AM CEST, xiyou.wangcong@...il.com wrote:
>On Thu, Jul 26, 2018 at 9:33 AM Jiri Pirko <jiri@...nulli.us> wrote:
>>
>> From: Jiri Pirko <jiri@...lanox.com>
>>
>> In case a chain is empty and not explicitly created by a user,
>> such chain should not exist. The only exception is if there is
>> an action "goto chain" pointing to it. In that case, don't show the
>> chain in the dump. Track the chain references held by actions and
>> use them to find out if a chain should or should not be shown
>> in chain dump.
>
>Hiding it makes sense. But you still need to make sure
>user can't find it by ID, hiding it merely means user can't
>see it.
>
>Also, I don't understand why you increase the refcnt
>for a hiding chain either, like Jakub mentioned.
>
>If user can't see it, it must not be found by ID either.

Ack. Will do that.