Re: [virtio-dev] Re: [PATCH v11] virtio-net: support inner header hash

[Heng Qi <hengqi@linux.alibaba.com>]

å 2023/3/23 äå11:58, Heng Qi åé:
> å 2023/3/23 äå11:13, Parav Pandit åé:
> > > From: Michael S. Tsirkin <mst@redhat.com>
> > > Sent: Wednesday, March 22, 2023 12:42 PM
> > > Yes. But my point is this. Some flows can be IPv4 others IPv6.
> > > Do you see a way to have a key that will result in a symmetrical 
> > > hash for both
> > > IPv4 and IPv6? Can you give an example please?
> > Heng,
> >
> > Is that the requirement to have two completely different flows (ipv, 
> > ipv6) to steer to a single RQ?
>
> Michael should be talking about whether there is a symmetric key that 
> can serve both IPv4 and IPv6, so that they can respectively achieve 
> the purpose of symmetric hashing.
> I am not an expert in hashing, but this article [1] deduces a 
> symmetric hash key, and I think it should be possible to deduce a 
> specific key to meet this requirement.

Sorry for the lost link:
[1] https://www.ndsl.kaist.edu/~kyoungsoo/papers/TR-symRSS.pdf

> Or we should support XOR hashing.
>
> Thanks.
>
> > The requirement, what I understood, is between two directions for a 
> > flow to result in a single hash value.
>
>
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