Started on metadata support this week. I'm really starting to get a feel for how the protocol has been influenced by Nicira's work on Open vSwitch. Although it doesn't yet support much of the 1.1 and 1.2 specifications, they use the constants from 1.2 to define matches. I've submitted a patch for review, parsing metadata messages. With the feedback come back I'm looking at how I can use NXAST (Nicira's action type extensions) to test and verify that the patch works. When the 1.1 instruction support goes through, I'll be able to get OpenFlow to control the metadata rather than just NXAST.