PF_PACKET RPS like using bpf

[Alexandre Cassen <acassen@gmail.com>]

Hello,

While implementing a large scale L2 processing soft, there is a need for 
high perf ingress handling.

In short: using BPF socket_filter prog with a hash func over ethernet 
address to distribute load across multiple PF_PACKET sockets: mainly 
filtering out non related hkey packets. It simplify userland app by 
using multiple PF_PACKET sockets in dedicated pthread.

Longer discussion + quick source code illustration here:

https://github.com/acassen/bpf-pfpacket-rps


My question would be related to sockmap. I tried to figure out how to 
perform the same policing design using sockmap. And cant find my way 
around it :/ If bpf verdict prog can get socket fd from __sk_buff then 
it could drives the same hash/policing decision.

Is it possible to get socket fd from __sk_buff from sockmap verdict prog ?

regs,
Alexandre