[dpdk-dev] [RFC] Generic flow director/filtering/classification API

Chilikin, Andrey andrey.chilikin at intel.com
Fri Jul 15 12:02:17 CEST 2016


Hi Sugesh,

> -----Original Message-----
> From: dev [mailto:dev-bounces at dpdk.org] On Behalf Of Chandran, Sugesh
> Sent: Friday, July 15, 2016 10:23 AM
> To: 'Adrien Mazarguil' <adrien.mazarguil at 6wind.com>

<snip>

> > > > To PMD maintainers: please comment if you know devices that
> > > > support tagging matching packets with more than 32 bits of
> > > > user-provided data!
> > > [Sugesh] I guess the flow director ID is 64 bit , The XL710 datasheet says so.
> > > And in the 'rte_mbuf' structure the 64 bit FDIR-ID is shared with
> > > rss hash. This can be a software driver limitation that expose only
> > > 32 bit. Possibly because of cache alignment issues? Since the
> > > hardware can support 64 bit, I feel it make sense to support 64 bit as well.

XL710 supports 32bit FDIR ID only, I believe you mix it up with flexible payload data which can take 0, 4 or 8 bytes of the RX descriptor.

Regards,
Andrey


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