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[ Upstream commit57531b3416] It seems that most of the tests prepare the interfaces once before the test run (setup_prepare()), rely on setup_wait() to wait for link and only then run the test(s). local_termination brings the physical interfaces down and up during test run but never wait for them to come up. If the auto-negotiation takes some seconds, first test packets are being lost, which leads to false-negative test results. Use setup_wait() in run_test() to make sure auto-negotiation has been completed after all simple_if_init() calls on physical interfaces and test packets will not be lost because of the race against link establishment. Fixes:90b9566aa5("selftests: forwarding: add a test for local_termination.sh") Reviewed-by: Vladimir Oltean <vladimir.oltean@nxp.com> Signed-off-by: Alexander Sverdlin <alexander.sverdlin@siemens.com> Link: https://patch.msgid.link/20251106161213.459501-1-alexander.sverdlin@siemens.com Signed-off-by: Jakub Kicinski <kuba@kernel.org> Signed-off-by: Sasha Levin <sashal@kernel.org>