[$] Accelerating netfilter with hardware offload, part 1

Supporting network protocols at high speeds in pure software is getting
increasingly difficult, with 25-100Gb/s interfaces available now and
200-400Gb/s starting to show up. Packet processing at 100Gb/s for offloading some packet filtering with netfilter. This patch
set not only adds the offload support, but also performs a refactoring of
the existing offload paths in the generic code and the network card
drivers. More work came in the following kernel releases. This seems like a
good moment to review the recent advancements in offloading in the network
stack.