From: "Alessandro Carminati (Red Hat)" <alessandro.carminati@gmail.com>
To: Andrii Nakryiko <andrii@kernel.org>,
Shuah Khan <shuah@kernel.org>,
Martin KaFai Lau <martin.lau@linux.dev>
Cc: Mykola Lysenko <mykolal@fb.com>,
Alexei Starovoitov <ast@kernel.org>,
Daniel Borkmann <daniel@iogearbox.net>,
Song Liu <song@kernel.org>,
Yonghong Song <yonghong.song@linux.dev>,
John Fastabend <john.fastabend@gmail.com>,
KP Singh <kpsingh@kernel.org>,
Stanislav Fomichev <sdf@google.com>, Hao Luo <haoluo@google.com>,
Jiri Olsa <jolsa@kernel.org>,
Alessandro Carminati <alessandro.carminati@gmail.com>,
bpf@vger.kernel.org, linux-kselftest@vger.kernel.org,
linux-kernel@vger.kernel.org
Subject: [PATCH v2] tools/testing/selftests/bpf/test_tc_tunnel.sh: Prevent client connect before server bind
Date: Thu, 14 Mar 2024 10:59:11 +0000 [thread overview]
Message-ID: <20240314105911.213411-1-alessandro.carminati@gmail.com> (raw)
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(-)
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
--
2.34.1
next reply other threads:[~2024-03-14 10:59 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-03-14 10:59 Alessandro Carminati (Red Hat) [this message]
2024-03-19 23:20 ` [PATCH v2] tools/testing/selftests/bpf/test_tc_tunnel.sh: Prevent client connect before server bind patchwork-bot+netdevbpf
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20240314105911.213411-1-alessandro.carminati@gmail.com \
--to=alessandro.carminati@gmail.com \
--cc=andrii@kernel.org \
--cc=ast@kernel.org \
--cc=bpf@vger.kernel.org \
--cc=daniel@iogearbox.net \
--cc=haoluo@google.com \
--cc=john.fastabend@gmail.com \
--cc=jolsa@kernel.org \
--cc=kpsingh@kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-kselftest@vger.kernel.org \
--cc=martin.lau@linux.dev \
--cc=mykolal@fb.com \
--cc=sdf@google.com \
--cc=shuah@kernel.org \
--cc=song@kernel.org \
--cc=yonghong.song@linux.dev \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.