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In the past, some of my colleagues have used Intel's 82599 NICs for kernel bypass. Their Linux driver is quite good, they have a DPDK platform for developing user-space apps to directly access ring buffers on the NIC, and if you do a quick search, you should be able to find examples online.

Cloudflare wrote a blog post recently about accelerated packet IO and their post mentions the 82599 NIC: https://blog.cloudflare.com/kernel-bypass/.

via netmap, yes.

You might be interested in this writeup by Luke Gorrie: https://github.com/lukego/blog/issues/13

His project, Snabb Switch, also utilize the Intel 82599 10G NIC that 'xtacy mentioned.

The netmap project (http://info.iet.unipi.it/~luigi/netmap/) or intel's dpdk help with this and don't require super fancy non-standard NICs.

Just a modified driver and a NIC that supports 'rings'.

Some Solarflare cards?

http://www.openonload.org/

That's a blob driver.