Re: [PATCH 0/6] Enable VF RSS for Niantic

["Ouyang, Changchun" <changchun.ouyang-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>]

Hi Bruce,

> -----Original Message-----
> From: Richardson, Bruce
> Sent: Monday, December 15, 2014 6:55 PM
> To: Ouyang, Changchun
> Cc: dev-VfR2kkLFssw@public.gmane.org
> Subject: Re: [dpdk-dev] [PATCH 0/6] Enable VF RSS for Niantic
> 
> On Mon, Dec 15, 2014 at 10:56:59AM +0800, Ouyang Changchun wrote:
> > This patch enables VF RSS for Niantic, which allow each VF having at most 4
> queues.
> > The actual queue number per VF depends on the number of VF:
> > VF number from 1~32: 4 queues per VF;
> > VF number from 33~max vf num: 2 queues per VF;
> >
> > On host, to enable VF RSS functionality, mq mode should be set as
> > ETH_MQ_RX_VMDQ_RSS or ETH_MQ_RX_RSS mode, and SRIOV mode
> should be activated.
> > It also needs config VF RSS information like hash function, RSS key, RSS key
> length.
> >
> 
> Hi Changchun,
> 
> are there limitations to this support, as I understood that that RSS support for
> VFs was not fully available in Niantic-based hardware?
> 

The limitation here is RETA table, RSS key, Hash function are shared by pf and vf,
This is not like FVL, in FVL each VF may has its own RETA.

DPDK can setup 4 queues per vf while Linux ixgbe driver setup only 2 queues per vf.
This is a little advantage in DPDK over Linux driver .

Thanks
Changchun