tests: add AF_XDP test using xdpilone

[Tuetuopay]

This is a follow-up PR to #527 where the AF_XDP integration test got dropped due to them depending on libbpf. We use the xdpilone crate there that is a pure-rust AF_XDP userspace library.

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[mergify]

@Tuetuopay, this pull request is now in conflict and requires a rebase.

[Tuetuopay]

Rebased on main + align on 16k for Apple Silicon.

[cameronelliott]

Hey, I think xdpilone is under the EUPL license, which is very similar to the GPL.
Can it be used in aya? I'm not sure it can.

I have also been studying this a little bit:
https://github.com/aws/s2n-quic/tree/main/tools/xdp/s2n-quic-xdp

Which may (or may not) have many of the pieces to do AF_XDP from Rust without libbpf or libxdp. (And it is Apache licensed)

Also, I think xdpilone only has the parts to do tx, and not rx, so maybe another path would be good from that perspective.

[Tuetuopay]

Hey, I think xdpilone is under the EUPL license, which is very similar to the GPL. Can it be used in aya? I'm not sure it can.

This has been discussed in my original XDP maps PR. IANAL but this is for tests only, this should not affect the library itself. Since artifacts based on xdpilone are not distributed it should not matter.

I have also been studying this a little bit: https://github.com/aws/s2n-quic/tree/main/tools/xdp/s2n-quic-xdp

Which may (or may not) have many of the pieces to do AF_XDP from Rust without libbpf or libxdp. (And it is Apache licensed)

Oh that's a pretty nice one. Seems a bit "as-is" but that's promising, if that's possible to pry it out of the aws lib.

Also, I think xdpilone only has the parts to do tx, and not rx, so maybe another path would be good from that perspective.

It definitely has the parts for RX since it's what's being tested in the integration tests. It lacks the XDP probe to send the packet to the socket map, but that's where Aya comes in. So it's not batteries included like libbpf is, but that does not matter.