netdev - Re: [PATCH net-next 1/2 v2] net sched actions: dump more than TCA_ACT_MAX

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Date:   Wed, 19 Apr 2017 07:06:12 -0400
From:   Jamal Hadi Salim <jhs@...atatu.com>
To:     Cong Wang <xiyou.wangcong@...il.com>
Cc:     Eric Dumazet <eric.dumazet@...il.com>,
        David Miller <davem@...emloft.net>,
        Linux Kernel Network Developers <netdev@...r.kernel.org>,
        Jiri Pirko <jiri@...nulli.us>
Subject: Re: [PATCH net-next 1/2 v2] net sched actions: dump more than
 TCA_ACT_MAX_PRIO actions per batch

On 17-04-19 02:12 AM, Cong Wang wrote:
> On Tue, Apr 18, 2017 at 7:32 PM, Jamal Hadi Salim <jhs@...atatu.com> wrote:
>> On 17-04-18 09:49 PM, Eric Dumazet wrote:

>> With this change I ask the kernel to fit as many actions as
>> possible in the 32K (all these 128 will fit in one batch).
>> Then it has to tell user space how many are in that batch
>> using TCAA_ACT_COUNT attribute.
>>
>> Make sense?
>
> Hmm? How do tc filters do dumping? There is no max and no
> COUNT attribute either, IIUC.
>

They dont have this hard coded 32 entries limit. So standard
dumping works fine. Note: count is a very speacial attribute to
make sure we can distinguish between old kernels which send
only 32 and new kernels which could send more.

cheers,
jamal