I don’t think the result would be compatible with the socket or io_uring API, but maybe io_uring could be extended a bit. Basically the kernel would opportunistically program a “flow director” or similar rule to send packets to special rx queue, and that queue would point to (pinned) application memory. Getting this to be compatible with iptables/nftables would be a mess or maybe entirely impossible.

I’ve never seen the accelerated steering stuff work well in practice, sadly. The code is messy, the diagnostics are basically nonexistent, and it’s not clear to me that many drivers support it well.