Re: [virtio-comment] [PATCH v13] virtio-net: support inner header hash

["Michael S. Tsirkin" <mst@redhat.com>]

On Wed, Apr 26, 2023 at 10:14:30PM +0800, Heng Qi wrote:
> This does not mean that every device needs to implement and support all of
> these, they can choose to support some protocols they want.
> 
> I add these because we have scale application scenarios for modern protocols
> VXLAN-GPE/GENEVE:
> 
> +\item In scenarios where the same flow passing through different tunnels is expected to be received in the same queue,
> +      warm caches, lessing locking, etc. are optimized to obtain receiving performance.
> 
> 
> Maybe the legacy GRE, VXLAN-GPE and GENEVE? But it has a little crossover.
> 
> Thanks.

But VXLAN-GPE/GENEVE can use source port for entropy.

	It is recommended that the UDP source port number
	 be calculated using a hash of fields from the inner packet

That is best because
it allows end to end control and is protocol agnostic.
All that is missing is symmetric Toepliz and all is well?

-- 
MST


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