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Sun Jian
f0eff94d07
Strengthen xdp_veth_egress to check that each destination observes the MAC selected for its own egress ifindex, instead of only checking that the observed MAC differs from a single magic value. Add a generic XDP last-destination test where an earlier destination does not have a devmap egress program while the final destination does. This covers the case where the final destination runs on the original skb and could otherwise rewrite packet data still shared with an earlier cloned skb. Use deterministic DEVMAP_HASH keys for the egress map so the intended last destination is stable. Initialize the result map with a sentinel value and check that store_mac_1 overwrites it before checking that the earlier destination did not observe the MAC written by the final destination. Suggested-by: Jiayuan Chen <jiayuan.chen@linux.dev> Signed-off-by: Sun Jian <sun.jian.kdev@gmail.com> Link: https://lore.kernel.org/r/20260612114032.244616-3-sun.jian.kdev@gmail.com Signed-off-by: Alexei Starovoitov <ast@kernel.org>