[PATCH 6.6 056/116] selftests: openvswitch: fix tcpdump execution

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6.6-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Adrian Moreno <amorenoz@xxxxxxxxxx>

[ Upstream commit a17975992cc11588767175247ccaae1213a8b582 ]

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: 74cc26f416b9 ("selftests: openvswitch: add interface support")
Signed-off-by: Adrian Moreno <amorenoz@xxxxxxxxxx>
Acked-by: Eelco Chaudron <echaudro@xxxxxxxxxx>
Link: https://patch.msgid.link/20241217211652.483016-1-amorenoz@xxxxxxxxxx
Signed-off-by: Jakub Kicinski <kuba@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
 tools/testing/selftests/net/openvswitch/openvswitch.sh | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/tools/testing/selftests/net/openvswitch/openvswitch.sh b/tools/testing/selftests/net/openvswitch/openvswitch.sh
index bab7436c6834..a0f4764ad0af 100755
--- a/tools/testing/selftests/net/openvswitch/openvswitch.sh
+++ b/tools/testing/selftests/net/openvswitch/openvswitch.sh
@@ -128,8 +128,10 @@ ovs_add_netns_and_veths () {
 		ovs_add_if "$1" "$2" "$4" -u || return 1
 	fi
 
-	[ $TRACING -eq 1 ] && ovs_netns_spawn_daemon "$1" "$ns" \
-			tcpdump -i any -s 65535
+	if [ $TRACING -eq 1 ]; then
+		ovs_netns_spawn_daemon "$1" "$3" tcpdump -l -i any -s 6553
+		ovs_wait grep -q "listening on any" ${ovs_dir}/stderr
+	fi
 
 	return 0
 }
-- 
2.39.5







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