[Cake] fq in p4

[Toke Høiland-Jørgensen]

Dave Taht <dave.taht at gmail.com> writes:

> some word from avind's group.
>
> "Thanks Dave for the pointer!  Sounds very interesting, so we will
> definitely take a look.
>
> We do have p4 code for AFQ and happy to send it your way. There are
> two crucial components to the AFQ implementation -- one is the switch
> state stuff and that is easily expressed in p4, and the other is the
> queue scheduling stuff which p4 currently doesn't provide any
> knobs/mechanisms for realizing it. But there are some upcoming
> Barefoot mechanisms that can help us directly realize the necessary
> mechanism (i.e., the rotating priority queue mechanism as described in
> the paper) and we do think that the queue scheduling disciplines would
> eventually make its way into standard p4 in some time..."

Yeah, the lack of any interface to the queueing in p4 always bothered
be. Good to see that is (hopefully) being worked on :)

-Toke