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Add a selftest covering ETH_HLEN-sized IPv4/IPv6 EtherType inputs for bpf_prog_test_run_skb(). Reuse a single zero-initialized struct ethhdr eth_hlen and set eth_hlen.h_proto from the per-test h_proto field. Also add a dedicated tc_adjust_room program and route the short IPv4/IPv6 cases to it, so the selftest actually exercises the bpf_skb_adjust_room() path from the report. Signed-off-by: Sun Jian <sun.jian.kdev@gmail.com> Link: https://lore.kernel.org/r/20260408034623.180320-3-sun.jian.kdev@gmail.com Signed-off-by: Alexei Starovoitov <ast@kernel.org>