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

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Message-ID: <d2ec62c3-afab-8a55-9329-555fc3ff23f0@mojatatu.com>
Date:   Fri, 25 Oct 2019 17:05:45 -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


Like attached...

cheers,
jamal

On 2019-10-25 2:17 p.m., Jamal Hadi Salim wrote:
> On 2019-10-25 12:53 p.m., Vlad Buslov wrote:
> [..]
> 
> Sorry, the distractions here are not helping.
> When i responded i had started to do below
> 
> enum {
>          TCA_ACT_UNSPEC,
>          TCA_ACT_KIND,
>          TCA_ACT_OPTIONS,
>          TCA_ACT_INDEX,
>          TCA_ACT_STATS,
>          TCA_ACT_PAD,
>          TCA_ACT_COOKIE,
>          TCA_ACT_ROOT_FLAGS,
>          __TCA_ACT_MAX
> };
> 
> Note: "TCA_ACT_ROOT_FLAGS"
> I think your other email may have tried to do the same?
> So i claimed it was there in that email because grep showed it
> but that's because i had added it;->
> 
>> For cls API lets take flower as an example: fl_change() parses 
>> TCA_FLOWER, and calls
>> fl_set_parms()->tcf_exts_validate()->tcf_action_init() with
>> TCA_FLOWER_ACT nested attribute. No TCA_ROOT is expected, TCA_FLOWER_ACT
>> contains up to TCA_ACT_MAX_PRIO nested TCA_ACT attributes. So where can
>> I include it without breaking backward compatibility?
>>
> Not a clean solution but avoids the per action TLV attribute:
> 
> in user space parse_action() you add TCA_ACT_ROOT_FLAGS
> if the user specifies this on the command line.
> 
> in the kernel everything just passes NULL for root_flags
> when invocation is from tcf_exts_validate() i.e both
> tcf_action_init_1() and
> tcf_action_init()
> 
> In tcf_action_init_1(), if root_flags is NULL
> you try to get flags from from tb[TCA_ACT_ROOT_FLAGS]
> 
> Apologies in advance for any latency - I will have time tomorrow.
> 
> cheers,
> jamal


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