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[ Upstream commita17975992c] Fix the way tcpdump is executed by: - Using the right variable for the namespace. Currently the use of the empty "ns" makes the command fail. - Waiting until it starts to capture to ensure the interesting traffic is caught on slow systems. - Using line-buffered output to ensure logs are available when the test is paused with "-p". Otherwise the last chunk of data might only be written when tcpdump is killed. Fixes:74cc26f416("selftests: openvswitch: add interface support") Signed-off-by: Adrian Moreno <amorenoz@redhat.com> Acked-by: Eelco Chaudron <echaudro@redhat.com> Link: https://patch.msgid.link/20241217211652.483016-1-amorenoz@redhat.com Signed-off-by: Jakub Kicinski <kuba@kernel.org> Signed-off-by: Sasha Levin <sashal@kernel.org>