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

David Ahern
2016-06-17T15:36:03Z

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@cumulusnetworks.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.