How do I get Socket Direct Protocol kernel modules into Ubuntu Server?

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http://serverfault.com – I'm wanting to use SDP under Ubuntu Server. However, the kernel doesn't seem to have SDP kernel modules in it. I thought I'd try to compile a kernel with them in, but the kernel source that comes with Ubuntu 12.04 doesn't seem to have this module. I've seen comments that suggest it's not in the mainline kernel yet. Although those comments were made in 2009. How do I get SDP into my kernel? (HowTos)