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Or better yet, Mellanox VMA since it's open source (unlike Solarflare OpenOnload) and the NICs are far less expensive.

That's not true. OpenOnload is open source:

It as been OSS since forever, but I thought that there were some patent gotchas. In any case it now apparently even support non-SolarFlare NICs!

Onload has also has other nice features like accelerating machine-local stuff (pipes, unix sockets and other stuff).

I have found OpenOnload to be easier to use than VMA, although I think you can go a bit faster with Mellanox NICs.