[PATCH] selftests/net: give more time to udpgro bg processes to complete startup

[Adrien Thierry <athierry@redhat.com>]

In some conditions, background processes in udpgro don't have enough
time to set up the sockets. When foreground processes start, this
results in the test failing with "./udpgso_bench_tx: sendmsg: Connection
refused". For instance, this happens from time to time on a Qualcomm
SA8540P SoC running CentOS Stream 9.

To fix this, increase the time given to background processes to
complete the startup before foreground processes start.

Signed-off-by: Adrien Thierry <athierry@redhat.com>
---
This is a continuation of the hack that's present in those tests. Other
ideas are welcome to fix this in a more permanent way.

 tools/testing/selftests/net/udpgro.sh         | 4 ++--
 tools/testing/selftests/net/udpgro_bench.sh   | 2 +-
 tools/testing/selftests/net/udpgro_frglist.sh | 2 +-
 3 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/tools/testing/selftests/net/udpgro.sh b/tools/testing/selftests/net/udpgro.sh
index ebbd0b282432..6a443ca3cd3a 100755
--- a/tools/testing/selftests/net/udpgro.sh
+++ b/tools/testing/selftests/net/udpgro.sh
@@ -50,7 +50,7 @@ run_one() {
 		echo "failed" &
 
 	# Hack: let bg programs complete the startup
-	sleep 0.1
+	sleep 0.2
 	./udpgso_bench_tx ${tx_args}
 	ret=$?
 	wait $(jobs -p)
@@ -117,7 +117,7 @@ run_one_2sock() {
 		echo "failed" &
 
 	# Hack: let bg programs complete the startup
-	sleep 0.1
+	sleep 0.2
 	./udpgso_bench_tx ${tx_args} -p 12345
 	sleep 0.1
 	# first UDP GSO socket should be closed at this point
diff --git a/tools/testing/selftests/net/udpgro_bench.sh b/tools/testing/selftests/net/udpgro_bench.sh
index fad2d1a71cac..8a1109a545db 100755
--- a/tools/testing/selftests/net/udpgro_bench.sh
+++ b/tools/testing/selftests/net/udpgro_bench.sh
@@ -39,7 +39,7 @@ run_one() {
 	ip netns exec "${PEER_NS}" ./udpgso_bench_rx -t ${rx_args} -r &
 
 	# Hack: let bg programs complete the startup
-	sleep 0.1
+	sleep 0.2
 	./udpgso_bench_tx ${tx_args}
 }
 
diff --git a/tools/testing/selftests/net/udpgro_frglist.sh b/tools/testing/selftests/net/udpgro_frglist.sh
index 832c738cc3c2..7fe85ba51075 100755
--- a/tools/testing/selftests/net/udpgro_frglist.sh
+++ b/tools/testing/selftests/net/udpgro_frglist.sh
@@ -44,7 +44,7 @@ run_one() {
 	ip netns exec "${PEER_NS}" ./udpgso_bench_rx ${rx_args} -r &
 
 	# Hack: let bg programs complete the startup
-	sleep 0.1
+	sleep 0.2
 	./udpgso_bench_tx ${tx_args}
 }
 
-- 
2.38.1