[IOAT] I/OAT patches repost

Hi I'm reposting these, originally posted by Chris Leech a few weeks ago.
However, there is an extra part since I broke up one patch that was too 
big for netdev last time into two (patches 2 and 3).

Of course we're always looking for more style improvement comments, but 
more importantly we're posting these to talk about the larger issues 
around I/OAT and this code making it in upstream at some point.

These are also available on the wiki,  
http://linux-net.osdl.org/index.php/I/OAT .

Thanks -- Andy

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