unicast hash in ixgbe and ixgbevf

unicast hash in ixgbe and ixgbevf

[J.Hwan.Kim]

Hi, everyone

I'm using intel ixgbe and ixgbevf driver and SR-IOV option.

Is there any method for distributing the random IP packet stream
into several VF queues evenly?

For example, for each 4 VF queues,
can each a quarter of the IP stream be distributed to each 4 VF queues?

I checked the PFUTA register and tested it, but as far as I know,
with the 4K bit hash table, the stream is directed to queues
of which ROPE bit is set.
So, the stream is duplicated to the queues of which ROPE bit is set.
That is not what I want to do.

How can I distribute the random IP packets to several VF queues
without duplicating?

Thanks in advance.

Best Regards,

J.Hwan Kim

RE: unicast hash in ixgbe and ixgbevf

[Rose, Gregory V]

> -----Original Message-----
> From: netdev-owner@vger.kernel.org [mailto:netdev-owner@vger.kernel.org]
> On Behalf Of J.Hwan.Kim
> Sent: Saturday, September 17, 2011 4:03 AM
> To: netdev@vger.kernel.org
> Subject: unicast hash in ixgbe and ixgbevf
> 
> Hi, everyone
> 
> I'm using intel ixgbe and ixgbevf driver and SR-IOV option.
> 
> Is there any method for distributing the random IP packet stream
> into several VF queues evenly?
> 
> For example, for each 4 VF queues,
> can each a quarter of the IP stream be distributed to each 4 VF queues?
> 
> I checked the PFUTA register and tested it, but as far as I know,
> with the 4K bit hash table, the stream is directed to queues
> of which ROPE bit is set.
> So, the stream is duplicated to the queues of which ROPE bit is set.
> That is not what I want to do.
> 
> How can I distribute the random IP packets to several VF queues
> without duplicating?
[Greg Rose] 

Distribution of packets to different queues based upon IP address requires RSS which is not supported in our SR-IOV functions at this time.

Also, on the Intel 82599 and X540 adapters the VFs only support single queue operation.  There are plans for multiple queue operation based upon RSS in future products, but there is not support for it now.

- Greg Rose
LAN Access Division
Intel Corp.