Re: [PATCH v9] virtio-net: support inner header hash

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

On Mon, Feb 27, 2023 at 12:07:17PM +0800, Jason Wang wrote:
> Btw, this kind of 1:1 hash features seems not scalable and flexible.
> It requires an endless extension on bits/fields. Modern NICs allow the
> user to customize the hash calculation, for virtio-net we can allow to
> use eBPF program to classify the packets. It seems to be more flexible
> and scalable and there's almost no maintain burden in the spec (only
> bytecode is required, no need any fancy features/interactions like
> maps), easy to be migrated etc.
> 
> Prototype is also easy, tun/tap had an eBPF classifier for years.
> 
> Thanks

Yea BPF offload would be great to have. We have been discussing it for
years though - security issues keep blocking it. *Maybe* it's finally
going to be there but I'm not going to block this work waiting for BPF
offload.  And easily migrated is what BPF is not.

-- 
MST