netdev - Re: [patch net-next v4 0/4] return offloaded stats as default and expose original sw stats

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Date:	Sun, 19 Jun 2016 20:06:46 -0700
From:	Roopa Prabhu <roopa@...ulusnetworks.com>
To:	Jamal Hadi Salim <jhs@...atatu.com>
Cc:	Jiri Pirko <jiri@...nulli.us>,
	David Ahern <dsa@...ulusnetworks.com>,
	David Miller <davem@...emloft.net>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	Nogah Frankel <nogahf@...lanox.com>,
	Ido Schimmel <idosch@...lanox.com>,
	Elad Raz <eladr@...lanox.com>,
	Yotam Gigi <yotamg@...lanox.com>,
	Or Gerlitz <ogerlitz@...lanox.com>,
	Nikolay Aleksandrov <nikolay@...ulusnetworks.com>,
	John Linville <linville@...driver.com>,
	Thomas Graf <tgraf@...g.ch>,
	Andy Gospodarek <gospo@...ulusnetworks.com>,
	Scott Feldman <sfeldma@...il.com>, sd@...asysnail.net,
	eranbe@...lanox.com, Alexei Starovoitov <ast@...mgrid.com>,
	Eric Dumazet <edumazet@...gle.com>,
	"hannes@...essinduktion.org" <hannes@...essinduktion.org>,
	Florian Fainelli <f.fainelli@...il.com>
Subject: Re: [patch net-next v4 0/4] return offloaded stats as default and
 expose original sw stats

On Fri, Jun 17, 2016 at 7:54 AM, Jamal Hadi Salim <jhs@...atatu.com> wrote:
> On 16-06-17 10:05 AM, Jiri Pirko wrote:
>>
>> Fri, Jun 17, 2016 at 03:48:35PM CEST, dsa@...ulusnetworks.com wrote:
>>>
>>> On 6/17/16 2:24 AM, Jiri Pirko wrote:
>>>>
>>>>
>
>>
>> That is problematic. Existing apps depend on rtnetlink stats. But if we
>> don't count offloaded forwarded packets, the apps don't see anything.
>> Therefore I believe that this patchset approach is better. The existing
>> apps continue to work and future apps can use newly introduces sw_stats
>> to query slowpath traffic. Makes sense to me.
>>
>
> I agree with Jiri. It is a bad idea to depend on ethtool for any of
> this stuff.

The concern should not be that it is an ethtool api.
In all previous discussions on this patchset and also my
stats api patches, i have indicated that we have to move all stats
in one place, so naturally, ethtool stats should move eventually to the
stats api as a new nested netlink attribute. I think i called it
IFLA_STATS_LINK_HW  (or something like that)...
and this nested attribute should provide the flexibility and extensibility
of the current ethtool stats api.


> Is there a way we can tag netlink stats instead
> to indicate they are hardware or software?
> We already have a use case with the tc where someone could get/set
> hardware and/or software.
>
> cheers,
> jamal