netdev - Re: [PATCH net-next 00/13] Control action percpu counters allocation by netlink flag

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Message-ID: <43d4c598-88eb-27b3-a4bd-c777143acf89@mojatatu.com>
Date:   Fri, 25 Oct 2019 12:06:08 -0400
From:   Jamal Hadi Salim <jhs@...atatu.com>
To:     Vlad Buslov <vladbu@...lanox.com>
Cc:     Jiri Pirko <jiri@...nulli.us>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "xiyou.wangcong@...il.com" <xiyou.wangcong@...il.com>,
        "davem@...emloft.net" <davem@...emloft.net>,
        "mleitner@...hat.com" <mleitner@...hat.com>,
        "dcaratti@...hat.com" <dcaratti@...hat.com>,
        Eric Dumazet <edumazet@...gle.com>
Subject: Re: [PATCH net-next 00/13] Control action percpu counters allocation
 by netlink flag

On 2019-10-25 11:43 a.m., Jamal Hadi Salim wrote:
> On 2019-10-25 11:18 a.m., Vlad Buslov wrote:
>>
> 
>> The problem with this approach is that it only works when actions are
>> created through act API, and not when they are created together with
>> filter by cls API which doesn't expect or parse TCA_ROOT. That is why I
>> wanted to have something in tcf_action_init_1() which is called by both
>> of them.
>>
> 
> Aha. So the call path for tcf_action_init_1() via cls_api also needs
> to have this infra. I think i understand better what you wanted
> to do earlier with changing those enums.
> 

Hold on. Looking more at the code, direct call for tcf_action_init_1()
from the cls code path is for backward compat of old policer approach.
I think even modern iproute2 doesnt support that kind of call
anymore. So you can pass NULL there for the *flags.

But: for direct call to tcf_action_init() we would have
to extract the flag from the TLV.
The TLV already has TCA_ROOT_FLAGS in it.


cheers,
jamal