[dpdk-users] eBPF in DPDK

[Stephen Hemminger]

On Mon, 8 Apr 2019 21:16:53 +0300
Avi Cohen <acohen at ves.io> wrote:

> Stephen
> I did not understand. Is this eBPF dpdk feature can run in the kernel or
> userspace ?
> Regards avi
> 
> בתאריך יום ב׳, 8 באפר׳ 2019, 18:09, מאת Stephen Hemminger ‏<
> stephen at networkplumber.org>:  
> 
> > On Mon, 8 Apr 2019 17:25:55 +0300
> > Avi Cohen <acohen at ves.io> wrote:
> >  
> > > Hi All,
> > > can someone refer to the flow of a packet that is processed  in eBPF
> > > program in the kernel . and then forwarded to DPDK-app in user space.
> > > this was integrated into DPDK 18.05   but not documented. (
> > > https://doc.dpdk.org/guides-18.05/prog_guide/bpf_lib.html)
> > > what is the PMD type for this flow ? new socket ? what is the penalty ?
> > > i thought to do some traffic filtering  there.
> > > pros/cons ?
> > > Best Regards
> > > Avi  
> >
> >
> > Unlike Linux which has a predetermined set of steps in processing packets.
> > DPDK is a raw toolkit where the processing is composed totally by the
> > network application.
> >
> > Therefore DPDK has a raw eBPF library, it is up to the application to
> > install it where
> > it wants in the packet processing. One example is done via rx and tx
> > callbacks
> > as shown in the rte_bpf_ethdev.h.
> >  

DPDK is all in userspace. The eBPF library is just another facility
like LPM lookup, hash library and ACL.