netdev - [PATCH net-next v3 3/5] selftests: drv-net: Make rand

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Message-ID: <20250216182453.226325-4-gal@nvidia.com>
Date: Sun, 16 Feb 2025 20:24:51 +0200
From: Gal Pressman <gal@...dia.com>
To: "David S. Miller" <davem@...emloft.net>, Jakub Kicinski <kuba@...nel.org>
CC: <netdev@...r.kernel.org>, Eric Dumazet <edumazet@...gle.com>, Paolo Abeni
	<pabeni@...hat.com>, Simon Horman <horms@...nel.org>, Jonathan Corbet
	<corbet@....net>, Tony Nguyen <anthony.l.nguyen@...el.com>, Przemek Kitszel
	<przemyslaw.kitszel@...el.com>, Andrew Lunn <andrew+netdev@...n.ch>, "Tariq
 Toukan" <tariqt@...dia.com>, Edward Cree <ecree.xilinx@...il.com>, Ahmed Zaki
	<ahmed.zaki@...el.com>, <linux-doc@...r.kernel.org>, Gal Pressman
	<gal@...dia.com>, Nimrod Oren <noren@...dia.com>
Subject: [PATCH net-next v3 3/5] selftests: drv-net: Make rand_port() get a port more reliably

Instead of guessing a port and checking whether it's available, get an
available port from the OS.

Reviewed-by: Nimrod Oren <noren@...dia.com>
Signed-off-by: Gal Pressman <gal@...dia.com>
---
 tools/testing/selftests/net/lib/py/utils.py | 15 ++++-----------
 1 file changed, 4 insertions(+), 11 deletions(-)

diff --git a/tools/testing/selftests/net/lib/py/utils.py b/tools/testing/selftests/net/lib/py/utils.py
index 9e3bcddcf3e8..5a13f4fd3784 100644
--- a/tools/testing/selftests/net/lib/py/utils.py
+++ b/tools/testing/selftests/net/lib/py/utils.py
@@ -125,18 +125,11 @@ def ethtool(args, json=None, ns=None, host=None):
 
 def rand_port():
     """
-    Get a random unprivileged port, try to make sure it's not already used.
+    Get a random unprivileged port.
     """
-    for _ in range(1000):
-        port = random.randint(10000, 65535)
-        try:
-            with socket.socket(socket.AF_INET6, socket.SOCK_STREAM) as s:
-                s.bind(("", port))
-            return port
-        except OSError as e:
-            if e.errno != errno.EADDRINUSE:
-                raise
-    raise Exception("Can't find any free unprivileged port")
+    with socket.socket(socket.AF_INET6, socket.SOCK_STREAM) as s:
+        s.bind(("", 0))
+        return s.getsockname()[1]
 
 
 def wait_port_listen(port, proto="tcp", ns=None, host=None, sleep=0.005, deadline=5):
-- 
2.40.1