On Sat, Aug 2, 2025 at 2:24 AM Menglong Dong menglong8.dong@gmail.com wrote:
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@chinatelecom.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)
It seems you don't need to handle an exception with ksft. You can see os.sys.exit(1) triggers another exception when you run it without patch 1.
TAP version 13 1..1 # timeout set to 3600 # selftests: net: tcp_reuseport.py # TAP version 13 # 1..1 # FAIL: wrong assignment # # Exception| Traceback (most recent call last): # # Exception| File "/root/linux/tools/testing/selftests/net/./tcp_reuseport.py", line 26, in test_reuseport_select # # Exception| print("SUCCESS: assigned properly:", s1.accept()) # # Exception| ~~~~~~~~~^^ # # Exception| File "/usr/lib64/python3.13/socket.py", line 295, in accept # # Exception| fd, addr = self._accept() # # Exception| ~~~~~~~~~~~~^^ # # Exception| BlockingIOError: [Errno 11] Resource temporarily unavailable # # Exception| # # Exception| During handling of the above exception, another exception occurred: # # Exception| # # Exception| Traceback (most recent call last): # # Exception| File "/root/linux/tools/testing/selftests/net/lib/py/ksft.py", line 244, in ksft_run # # Exception| case(*args) # # Exception| ~~~~^^^^^^^ # # Exception| File "/root/linux/tools/testing/selftests/net/./tcp_reuseport.py", line 29, in test_reuseport_select # # Exception| os.sys.exit(1) # # Exception| ~~~~~~~~~~~^^^ # # Exception| SystemExit: 1 # not ok 1 tcp_reuseport.test_reuseport_select # # Totals: pass:0 fail:1 xfail:0 xpass:0 skip:0 error:0 not ok 1 selftests: net: tcp_reuseport.py # exit=1
btw, I'd write an official uAPI selftest in plain C for socket as python sometimes does a tricky thing and I don't trust it.
For example, this is...
from socket import *
s = socket() s.listen(-1)
internally translated to:
socket(AF_INET, SOCK_STREAM|SOCK_CLOEXEC, IPPROTO_IP) = 3 listen(3, 0) = 0