>> In the future, both simple and sophisticated policy like RSS or other guest >> driven steering policies could be done on top. > > IMHO there should be a more practical example before adding all this > indirection. And it would be nice to understand why this queue selection > needs to be tun specific.
I was thinking the same and this reminds me of the various strategies implemented in packet fanout. tun_cpu_select_queue is analogous to fanout_demux_cpu though it is tun-specific in that it requires tun->numqueues. Fanout accrued various strategies until it gained an eBPF variant. Just supporting BPF is probably sufficient here, too.
