On Wed, Jan 20, 2021 at 12:26 PM Toke Høiland-Jørgensen <t...@redhat.com> wrote: > > This argument, however, I buy: bpf_redirect() is the single-purpose > helper for redirecting to an ifindex, bpf_redirect_xsk() is the > single-purpose helper for redirecting to an XSK, and bpf_redirect_map() > is the generic one that does both of those and more. Fair enough, > consider me convinced :) > > > A lot of back-and-forth for *one* if-statement, but it's kind of a > > design thing for me. ;-) > > Surely you don't mean to imply that you have *better* things to do with > your time than have a 10-emails-long argument over a single if > statement? ;)
After reading this thread I think I have to pour cold water on the design. The performance blip comes from hard coded assumptions: + queue_id = xdp->rxq->queue_index; + xs = READ_ONCE(dev->_rx[queue_id].xsk); bpf can have specialized helpers, but imo this is beyond what's reasonable. Please move such things into the program and try to make bpf_redirect_map faster. Making af_xdp non-root is orthogonal. If there is actual need for that it has to be designed thoroughly and not presented as "this helper may help to do that". I don't think "may" will materialize unless people actually work toward the goal of non-root.
