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Three tests are cooking GSO packets but do not provide gso_size information to the kernel, triggering this message: TCP: tun0: Driver has suspect GRO implementation, TCP performance may be compromised. Add --mss option to avoid this warning. Signed-off-by: Eric Dumazet <edumazet@google.com> Reviewed-by: Willem de Bruijn <willemb@google.com> Link: https://patch.msgid.link/20250710155641.3028726-1-edumazet@google.com Signed-off-by: Jakub Kicinski <kuba@kernel.org>