This patch is actually a preparation for an upcoming patch set that I want to integrate into virtio-net which implements the RSS feature. ( https://lists.oasis-open.org/archives/virtio-dev/201805/msg00024.html) So there is a use case. The rationale behind this is to distinguish the infrastructure preparation needed for the BPF from the actual RSS feature implementation.
On Tue, Jun 19, 2018 at 4:49 PM, Daniel P. Berrangé <berra...@redhat.com> wrote: > On Tue, Jun 19, 2018 at 04:21:59PM +0300, Sameeh Jubran wrote: > > From: Sameeh Jubran <sjub...@redhat.com> > > > > The Berkeley Packet Filter has been in the kernel for a while now and I > > think it is time that it is introduced to Qemu. This patch is an > > infrastructure for any future usage of the BPF in Qemu. > > > > It is important to note that the tun driver had started supporting using > > BPF programs through ioctls (TUNSETSTEERINGEBPF and TUNSETFILTEREBPF). > > > > At first, instead of adding the syscall wrappers, I wanted to integrate > libbpf > > library which resides in the Linux source tree under tools/lib/bpf. It > appears > > to be that by default it compiles to x64 on x64 arch - which can't be > > integrated into Qemu - and my attempts to compile the 32 bit versions > have > > failed. What's more interesting is that the vendors don't provide this > library > > in any package, which makes this library a nasty dependency. > > > > Please share your thoughts :) > > IMHO there should be example usage illustrated for some part of QEMU > before we add any general infrastructure, as you can't really do a > useful design evaluation without understanding its usage. > > It isn't clear that QEMU is neccessarily the best place to even do it, if > the intended usage is to provide network traffic firewalling for guest > NICs. eg libvirt already provides a firewalling system based on iptables, > that could have an BPFilter implementation added to it. > > Regards, > Daniel > -- > |: https://berrange.com -o- https://www.flickr.com/photos/ > dberrange :| > |: https://libvirt.org -o- > https://fstop138.berrange.com :| > |: https://entangle-photo.org -o- https://www.instagram.com/ > dberrange :| > -- Respectfully, *Sameeh Jubran* *Linkedin <https://il.linkedin.com/pub/sameeh-jubran/87/747/a8a>* *Software Engineer @ Daynix <http://www.daynix.com>.*
