ETH_RSS_NONFRAG_IPV4_UDP with netvsc, and memory setup for mlx4

[Sylvain Vasseur]

Hello,

I have been trying to use the netvsc PMD driver lately and face an issue
with the RSS flag for UDP.
I figured that this is because the PMD does not handle NDIS_HASH_UDP_IPV4,
so I am planning at trying to submit a change to the PMD, however I am
unsure about the value of the UDP constant. I found on
https://microsoft.github.io/windows-docs-rs/doc/windows/Win32/NetworkManagement/Ndis/constant.NDIS_HASH_UDP_IPV4.html
that it should be 0x00004000.
Would someone have some proper knowledge about this specific setting?

And after having used that change locally, I am now facing some issues with
the mlx4 PMD used under the hood of netvsc. My memory allocation makes my
buffers exist at a different location than my memory pool and this creates
an issue:
net_mlx4: port 0 unable to find virtually contiguous chunk for address
Did someone already tried to use some custom memory management with the mlx
pmd?

Thanks,
Sylvain
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