On 08/25/2016 11:22 AM, Aaro Koskinen wrote:

Hi,

On Thu, Aug 25, 2016 at 09:50:15AM -0700, David Daney wrote:

quoted

Ideally we would configure the packet classifiers on the RX side to create
multiple RX queues based on a hash of the TCP 5-tuple, and handle each queue
with a single NAPI instance.  That should result in better performance while
maintaining packet ordering.

Would this need anything else than reprogramming CVMX_PIP_PRT_TAGX, and
eliminating the global pow_receive_group and creating multiple NAPI instances
and registering IRQ handlers?

That is essentially how it works.  Set the tag generation parameters, 
and use the low order bits of the tag to select which POW/SSO group is 
assigned.  The SSO group corresponds to an "rx queue"

In the Yocto tree, the CVMX_PIP_PRT_TAGX register values are actually
documented:

http://git.yoctoproject.org/cgit/cgit.cgi/linux-yocto-contrib/tree/arch/mips/include/asm/octeon/cvmx-pip-defs.h?h=apaliwal/octeon#n3737

Wow, I didn't realize that documentation was made public.

A.