netdev - Re: [Patch net-next] net_sched: add reverse binding for tc class

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Date:   Wed, 30 Aug 2017 16:15:03 -0700
From:   Cong Wang <xiyou.wangcong@...il.com>
To:     Daniel Borkmann <daniel@...earbox.net>
Cc:     Linux Kernel Network Developers <netdev@...r.kernel.org>,
        Jamal Hadi Salim <jhs@...atatu.com>
Subject: Re: [Patch net-next] net_sched: add reverse binding for tc class

On Wed, Aug 30, 2017 at 3:45 PM, Daniel Borkmann <daniel@...earbox.net> wrote:
> On 08/31/2017 12:22 AM, Daniel Borkmann wrote:
>>
>> The prog->res.classid is the default one, but can be overridden
>> later depending on the specified program. cls_bpf_classify() does
>> after prog return (filter_res holds return code):
>>
>>      [...]
>>          if (filter_res == 0)
>>              continue;
>>          if (filter_res != -1) {
>>              res->class   = 0;
>>              res->classid = filter_res;
>>          } else {
>>              *res = prog->res;
>>          }
>>      [...]
>>
>> Meaning in case of a match (-1), we use the default bound one,
>> but prog may as well return an alternative found classid if it
>> wants to. So both versions are possible.
>
>
> But even for that case your patch looks fine to me actually, since
> for dynamic classid we set class to 0. No objections from my side
> then.

Sounds good. Then I will leave it as it is.

Thanks for explanation.