[PATCH 6.1 148/280] selftests: net: amt: wait longer for connection before sending packets

Greg Kroah-Hartman
2026-02-04T15:11:25Z

From: Taehee Yoo <ap420073@gmail.com>

[ Upstream commit 04708606fd7bdc34b69089a4ff848ff36d7088f9 ]

Both send_mcast4() and send_mcast6() use sleep 2 to wait for the tunnel
connection between the gateway and the relay, and for the listener
socket to be created in the LISTENER namespace.

However, tests sometimes fail because packets are sent before the
connection is fully established.

Increase the waiting time to make the tests more reliable, and use
wait_local_port_listen() to explicitly wait for the listener socket.

Fixes: c08e8baea78e ("selftests: add amt interface selftest script")
Signed-off-by: Taehee Yoo <ap420073@gmail.com>
Link: https://patch.msgid.link/20260120133930.863845-1-ap420073@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
tools/testing/selftests/net/amt.sh | 7 +++++--
1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/tools/testing/selftests/net/amt.sh b/tools/testing/selftests/net/amt.sh
index 7e7ed6c558da9..ea40b469a8c11 100755
--- a/tools/testing/selftests/net/amt.sh
+++ b/tools/testing/selftests/net/amt.sh
@@ -73,6 +73,8 @@
# +------------------------+
#==============================================================================

+source lib.sh
+
readonly LISTENER=$(mktemp -u listener-XXXXXXXX)
readonly GATEWAY=$(mktemp -u gateway-XXXXXXXX)
readonly RELAY=$(mktemp -u relay-XXXXXXXX)
@@ -240,14 +242,15 @@ test_ipv6_forward()

send_mcast4()
{
- sleep 2
+ sleep 5
+ wait_local_port_listen ${LISTENER} 4000 udp
ip netns exec "${SOURCE}" bash -c \
'printf "%s %128s" 172.17.0.2 | nc -w 1 -u 239.0.0.1 4000' &
}

send_mcast6()
{
- sleep 2
+ wait_local_port_listen ${LISTENER} 6000 udp
ip netns exec "${SOURCE}" bash -c \
'printf "%s %128s" 2001:db8:3::2 | nc -w 1 -u ff0e::5:6 6000' &
}
--
2.51.0