On 19/10/23 (水) 2:45:05, Toke Høiland-Jørgensen wrote:

John Fastabend [off-list ref] writes:

quoted

I think for sysadmins in general (not OVS) use case I would work
with Jesper and Toke. They seem to be working on this specific
problem.

We're definitely thinking about how we can make "XDP magically speeds up
my network stack" a reality, if that's what you mean. Not that we have
arrived at anything specific yet...

And yeah, I'd also be happy to discuss what it would take to make a
native XDP implementation of the OVS datapath; including what (if
anything) is missing from the current XDP feature set to make this
feasible. I must admit that I'm not quite clear on why that wasn't the
approach picked for the first attempt to speed up OVS using XDP...

Here's some history from William Tu et al.
https://linuxplumbersconf.org/event/2/contributions/107/

Although his aim was not to speed up OVS but to add kernel-independent 
datapath, his experience shows full OVS support by eBPF is very difficult.
Later I discussed this xdp_flow approach with William and we find value 
performance-wise in such a way of partial offloading to XDP. TC is one 
of ways to achieve the partial offloading.

Toshiaki Makita