netdev - Re: [PATCH net-next 1/4] selftests: drv-net: try to check if port is in use

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Date: Thu, 20 Jun 2024 18:52:40 -0700
From: David Wei <dw@...idwei.uk>
To: Jakub Kicinski <kuba@...nel.org>, davem@...emloft.net
Cc: netdev@...r.kernel.org, edumazet@...gle.com, pabeni@...hat.com,
 willemdebruijn.kernel@...il.com, ecree.xilinx@...il.com
Subject: Re: [PATCH net-next 1/4] selftests: drv-net: try to check if port is
 in use

On 2024-06-20 16:28, Jakub Kicinski wrote:
> We use random ports for communication. As Willem predicted
> this leads to occasional failures. Try to check if port is
> already in use by opening a socket and binding to that port.
> 
> Signed-off-by: Jakub Kicinski <kuba@...nel.org>
> ---
>  tools/testing/selftests/net/lib/py/utils.py | 13 ++++++++++++-
>  1 file changed, 12 insertions(+), 1 deletion(-)
> 
> diff --git a/tools/testing/selftests/net/lib/py/utils.py b/tools/testing/selftests/net/lib/py/utils.py
> index 0540ea24921d..9fa9ec720c89 100644
> --- a/tools/testing/selftests/net/lib/py/utils.py
> +++ b/tools/testing/selftests/net/lib/py/utils.py
> @@ -3,6 +3,7 @@
>  import json as _json
>  import random
>  import re
> +import socket
>  import subprocess
>  import time
>  
> @@ -81,7 +82,17 @@ import time
>      """
>      Get unprivileged port, for now just random, one day we may decide to check if used.

That day is today ;)

>      """
> -    return random.randint(10000, 65535)
> +    while True:
> +        port = random.randint(10000, 65535)
> +        try:
> +            with socket.socket(socket.AF_INET, socket.SOCK_STREAM) as s:
> +                s.bind(("", port))
> +            with socket.socket(socket.AF_INET6, socket.SOCK_STREAM) as s:
> +                s.bind(("", port))
> +            return port
> +        except OSError as e:
> +            if e.errno != 98:  # already in use
> +                raise
>  
>  
>  def wait_port_listen(port, proto="tcp", ns=None, host=None, sleep=0.005, deadline=5):