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

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Date:	Fri, 17 Jun 2016 09:35:53 -0600
From:	David Ahern <dsa@...ulusnetworks.com>
To:	Jamal Hadi Salim <jhs@...atatu.com>, Jiri Pirko <jiri@...nulli.us>
Cc:	David Miller <davem@...emloft.net>, netdev@...r.kernel.org,
	nogahf@...lanox.com, idosch@...lanox.com, eladr@...lanox.com,
	yotamg@...lanox.com, ogerlitz@...lanox.com,
	roopa@...ulusnetworks.com, nikolay@...ulusnetworks.com,
	linville@...driver.com, tgraf@...g.ch, gospo@...ulusnetworks.com,
	sfeldma@...il.com, sd@...asysnail.net, eranbe@...lanox.com,
	ast@...mgrid.com, edumazet@...gle.com, hannes@...essinduktion.org,
	f.fainelli@...il.com
Subject: Re: [patch net-next v4 0/4] return offloaded stats as default and
 expose original sw stats

On 6/17/16 8:54 AM, Jamal Hadi Salim 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. Is there a way we can tag netlink stats instead
> to indicate they are hardware or software?

Right, old API but the key here is that low level h/w stats are returned 
by a different API.

By default ip, ifconfig, snmpd, etc all continue to get traditional S/W 
stats - counters as seen by the CPU.