diff mbox series

[v2] tools/testing/selftests/bpf/test_tc_tunnel.sh: Prevent client connect before server bind

Message ID 20240314105911.213411-1-alessandro.carminati@gmail.com (mailing list archive)
State Accepted
Commit f803bcf9208a2540acb4c32bdc3616673169f490
Delegated to: BPF
Headers show
Series [v2] tools/testing/selftests/bpf/test_tc_tunnel.sh: Prevent client connect before server bind | expand

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Commit Message

Alessandro Carminati March 14, 2024, 10:59 a.m. UTC 
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.

The issue stems from a race condition between the netcat client and server.
The test author had addressed this problem by implementing a sleep, which
I have removed in this patch.
This patch introduces a function capable of sleeping for up to two seconds.
However, it can terminate the waiting period early if the port is reported
to be listening.

Signed-off-by: Alessandro Carminati (Red Hat) <alessandro.carminati@gmail.com>
---
 tools/testing/selftests/bpf/test_tc_tunnel.sh | 13 ++++++++++++-
 1 file changed, 12 insertions(+), 1 deletion(-)

Comments

patchwork-bot+netdevbpf@kernel.org March 19, 2024, 11:20 p.m. UTC | #1 
Hello:

This patch was applied to bpf/bpf-next.git (master)
by Andrii Nakryiko <andrii@kernel.org>:

On Thu, 14 Mar 2024 10:59:11 +0000 you 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.
> 
> [...]

Here is the summary with links:
  - [v2] tools/testing/selftests/bpf/test_tc_tunnel.sh: Prevent client connect before server bind
    https://git.kernel.org/bpf/bpf-next/c/f803bcf9208a

You are awesome, thank you!
diff mbox series

Patch

diff --git a/tools/testing/selftests/bpf/test_tc_tunnel.sh b/tools/testing/selftests/bpf/test_tc_tunnel.sh
index 910044f08908..7989ec608454 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 +92,16 @@  verify_data() {
 	fi
 }
 
+wait_for_port() {
+	for i in $(seq 20); do
+		if ip netns exec "${ns2}" ss ${2:--4}OHntl | grep -q "$1"; then
+			return 0
+		fi
+		sleep 0.1
+	done
+	return 1
+}
+
 set -e
 
 # no arguments: automated test, run all
@@ -193,6 +202,7 @@  setup
 # basic communication works
 echo "test basic connectivity"
 server_listen
+wait_for_port ${port} ${netcat_opt}
 client_connect
 verify_data
 
@@ -204,6 +214,7 @@  ip netns exec "${ns1}" tc filter add dev veth1 egress \
 	section "encap_${tuntype}_${mac}"
 echo "test bpf encap without decap (expect failure)"
 server_listen
+wait_for_port ${port} ${netcat_opt}
 ! client_connect
 
 if [[ "$tuntype" =~ "udp" ]]; then