Re: TC stats / hw offload question

Edward Cree
2019-02-11T11:44:44Z

On 09/02/19 17:39, Jamal Hadi Salim wrote:
> On 2019-02-08 5:26 a.m., Edward Cree wrote:
>>   I can't find any stats counters on
>>   the "match" either in the software path or the offload API.
>
> Hasnt been necessary thus far.
> Is your end goal to match and count?
My end goal is to implement TC offload in some hw we're designing
here at Solarflare.  So I'm trying to determine what hardware is
expected/required to do.
It might be possible to design our new hw so that we can attach a
counter to every action, if that's what TC wants.  But since the
other vendors don't seem to do that, I wondered if there was a
reason, or if perhaps the counter resources (and PCI bw to read
them) could be saved if all those separate counters aren't really
needed.  Right now the design we are considering would only count
packets as-matched, i.e. before any edits.  That's fine for encap
— you can calculate the bytes correction in SW — but not for decap
since in principle the length of the RXed outer headers could
vary (e.g. you might have IP options there).

-Ed