linux-kernel - [PATCH net v3 2/2] selftests/net: test TCP reuseport socket selection

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Message-ID: <20250802092435.288714-3-dongml2@chinatelecom.cn>
Date: Sat,  2 Aug 2025 17:24:35 +0800
From: Menglong Dong <menglong8.dong@...il.com>
To: edumazet@...gle.com,
	kuniyu@...gle.com
Cc: ncardwell@...gle.com,
	davem@...emloft.net,
	dsahern@...nel.org,
	kuba@...nel.org,
	pabeni@...hat.com,
	horms@...nel.org,
	shuah@...nel.org,
	kraig@...gle.com,
	linux-kernel@...r.kernel.org,
	netdev@...r.kernel.org,
	linux-kselftest@...r.kernel.org
Subject: [PATCH net v3 2/2] selftests/net: test TCP reuseport socket selection

The test script is provided by Kuniyuki in [1], which is used to test the
selection of the TCP reuseport socket problem.

Link: https://lore.kernel.org/netdev/20250801040757.1599996-1-kuniyu@google.com/ [1]
Signed-off-by: Menglong Dong <dongml2@...natelecom.cn>
---
 tools/testing/selftests/net/Makefile         |  1 +
 tools/testing/selftests/net/tcp_reuseport.py | 36 ++++++++++++++++++++
 2 files changed, 37 insertions(+)
 create mode 100755 tools/testing/selftests/net/tcp_reuseport.py

diff --git a/tools/testing/selftests/net/Makefile b/tools/testing/selftests/net/Makefile
index b31a71f2b372..0f4c3eea9709 100644
--- a/tools/testing/selftests/net/Makefile
+++ b/tools/testing/selftests/net/Makefile
@@ -117,6 +117,7 @@ TEST_GEN_FILES += tfo
 TEST_PROGS += tfo_passive.sh
 TEST_PROGS += broadcast_pmtu.sh
 TEST_PROGS += ipv6_force_forwarding.sh
+TEST_PROGS += tcp_reuseport.py
 
 # YNL files, must be before "include ..lib.mk"
 YNL_GEN_FILES := busy_poller netlink-dumps
diff --git a/tools/testing/selftests/net/tcp_reuseport.py b/tools/testing/selftests/net/tcp_reuseport.py
new file mode 100755
index 000000000000..eaeb7096382e
--- /dev/null
+++ b/tools/testing/selftests/net/tcp_reuseport.py
@@ -0,0 +1,36 @@
+#!/usr/bin/env python3
+# SPDX-License-Identifier: GPL-2.0
+
+import os
+
+from lib.py import ksft_run, ksft_exit
+from socket import *
+
+def test_reuseport_select() -> None:
+    s1 = socket()
+    s1.setsockopt(SOL_SOCKET, SO_REUSEPORT, 1)
+    s1.setsockopt(SOL_SOCKET, SO_BINDTODEVICE, b'lo')
+    s1.listen()
+    s1.setblocking(False)
+
+    s2 = socket()
+    s2.setsockopt(SOL_SOCKET, SO_REUSEPORT, 1)
+    s2.bind(s1.getsockname())
+    s2.listen()
+    s2.setblocking(False)
+
+    for i in range(3):
+        c = socket()
+        c.connect(s1.getsockname())
+        try:
+            print("SUCCESS: assigned properly:", s1.accept())
+        except:
+            print("FAIL: wrong assignment")
+            os.sys.exit(1)
+
+def main() -> None:
+    ksft_run([test_reuseport_select])
+    ksft_exit()
+
+if __name__ == "__main__":
+    main()
-- 
2.50.1