selftests/bpf: test_xdp_veth: Add XDP program on egress test
XDP programs loaded on egress is tested by test_xdp_redirect_multi.sh
but not by the test_progs framework.
Add a test case in test_xdp_veth.c to test the XDP program on egress.
Use the same BPF program than test_xdp_redirect_multi.sh that replaces
the source MAC address by one provided through a BPF map.
Use a BPF program that stores the source MAC of received packets in a
map to check the test results.
Signed-off-by: Bastien Curutchet (eBPF Foundation) <bastien.curutchet@bootlin.com>
Signed-off-by: Martin KaFai Lau <martin.lau@kernel.org>
Acked-by: Stanislav Fomichev <sdf@fomichev.me>
Link: https://patch.msgid.link/20250212-redirect-multi-v5-5-fd0d39fca6e6@bootlin.com