On 2/29/24 6:00 AM, Alessandro Carminati (Red Hat) wrote:
In some systems, the netcat server can incur in delay to start listening.
When this happens, the test can randomly fail in various points.
This is an example error message:
# ip gre none gso
# encap 192.168.1.1 to 192.168.1.2, type gre, mac none len 2000
# test basic connectivity
# Ncat: Connection refused.
This explained what is the issue. Please also explain how the patch solves it.
Signed-off-by: Alessandro Carminati (Red Hat) <alessandro.carminati@xxxxxxxxx>
---
tools/testing/selftests/bpf/test_tc_tunnel.sh | 19 ++++++++++++++++++-
1 file changed, 18 insertions(+), 1 deletion(-)
diff --git a/tools/testing/selftests/bpf/test_tc_tunnel.sh b/tools/testing/selftests/bpf/test_tc_tunnel.sh
index 910044f08908..01c0f4b1a8c2 100755
--- a/tools/testing/selftests/bpf/test_tc_tunnel.sh
+++ b/tools/testing/selftests/bpf/test_tc_tunnel.sh
@@ -72,7 +72,6 @@ cleanup() {
server_listen() {
ip netns exec "${ns2}" nc "${netcat_opt}" -l "${port}" > "${outfile}" &
server_pid=$!
- sleep 0.2
}
client_connect() {
@@ -93,6 +92,22 @@ verify_data() {
fi
}
+wait_for_port() {
+ local digits=8
+ local port2check=$(printf ":%04X" $1)
+ local prot=$([ "$2" == "-6" ] && echo 6 && digits=32)
+
+ for i in $(seq 20); do
+ if ip netns exec "${ns2}" cat /proc/net/tcp${prot} | \
+ sed -r 's/^[ \t]+[0-9]+: ([0-9A-F]{'${digits}'}:[0-9A-F]{4}) .*$/\1/' | \
+ grep -q "${port2check}"; then
The idea is to check if there is socket listening on port 8888?
May be something simpler like "ss -OHtl src :$1" instead?
--
pw-bot: cr
The check-and-wait fix in this patch is fine to get your test environment going.
Eventually, it will be good to see the test_tc_tunnel.sh test moved to
test_progs. The test_tc_tunnel.sh is not run by bpf CI and issue like this got
unnoticed. Some other "*.sh" tests have already been moved to test_progs.
