Merge branch 'xdp-metadata-support-for-tun-driver'

Marcus Wichelmann says:

====================
XDP metadata support for tun driver

Hi all,

this v5 of the patch series is very similar to v4, but rebased onto the
bpf-next/net branch instead of bpf-next/master.
Because the commit c047e0e0e435 ("selftests/bpf: Optionally open a
dedicated namespace to run test in it") is not yet included in this branch,
I changed the xdp_context_tuntap test to manually create a namespace to run
the test in.

Not so successful pipeline: https://github.com/kernel-patches/bpf/actions/runs/13682405154

The CI pipeline failed because of veristat changes in seemingly unrelated
eBPF programs. I don't think this has to do with the changes from this
patch series, but if it does, please let me know what I may have to do
different to make the CI pass.
====================

Link: https://patch.msgid.link/20250305213438.3863922-1-marcus.wichelmann@hetzner-cloud.de
Signed-off-by: Martin KaFai Lau <martin.lau@kernel.org>