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

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

On Thu, Mar 30, 2023 at 08:37:21PM +0800, Heng Qi wrote:
> 
> 
> 在 2023/3/21 上午3:48, Michael S. Tsirkin 写道:
> > On Wed, Mar 15, 2023 at 08:55:45PM +0800, Heng Qi wrote:
> > > We use the most basic GRE header fields (not NVGRE), not even optional
> > > fields.
> > I'd say yes, the most convincing usecase is with legacy GRE.
> 
> Yes. But we still have a strong need for VXLAN and GENEVE to do symmetric
> hashing. Please consider this.

Using a specific key seems fragile though in that a different one is
needed for e.g. ipv4 and ipv6.  An issue with VXLAN and GENEVE, yes?
Will support for XOR hashing address this sufficiently or is that not
acceptable to you? Or alternatively a modified Toeplitz, e.g. this
https://inbox.dpdk.org/dev/20190731123040.GG4512@6wind.com/
suggests Mellanox supports that. WDYT?

-- 
MST


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