linux-kernel - Re: [PATCHv2] selftests: net: devlink_port_split.py: skip test if no suitable device available

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Date:   Fri, 10 Mar 2023 16:05:41 -0800
From:   Jakub Kicinski <kuba@...nel.org>
To:     Po-Hsu Lin <po-hsu.lin@...onical.com>
Cc:     linux-kernel@...r.kernel.org, linux-kselftest@...r.kernel.org,
        netdev@...r.kernel.org, idosch@...lanox.com,
        danieller@...lanox.com, petrm@...lanox.com, shuah@...nel.org,
        pabeni@...hat.com, edumazet@...gle.com, davem@...emloft.net
Subject: Re: [PATCHv2] selftests: net: devlink_port_split.py: skip test if
 no suitable device available

On Tue,  7 Mar 2023 23:00:30 +0800 Po-Hsu Lin wrote:
>  def main(cmdline=None):
> +    test_ran = False

Could you move this variable init right before the 

	for port in ports.if_names:

line, and call it something like found_max_lanes ?

>      parser = make_parser()
>      args = parser.parse_args(cmdline)
>  
> @@ -240,12 +264,9 @@ def main(cmdline=None):
>          stdout, stderr = run_command(cmd)
>          assert stderr == ""
>  
> +        validate_devlink_output(json.loads(stdout))
>          devs = json.loads(stdout)['dev']
> -        if devs:
> -            dev = list(devs.keys())[0]
> -        else:
> -            print("no devlink device was found, test skipped")
> -            sys.exit(KSFT_SKIP)
> +        dev = list(devs.keys())[0]
>  
>      cmd = "devlink dev show %s" % dev
>      stdout, stderr = run_command(cmd)
> @@ -277,6 +298,11 @@ def main(cmdline=None):
>                  split_splittable_port(port, lane, max_lanes, dev)
>  
>                  lane //= 2
> +        test_ran = True
> +
> +    if not test_ran:
> +        print("Test not started, no suitable device for the test")

Then change the message to 

	f"Test not started, no port of device {dev} reports max_lanes"

> +        sys.exit(KSFT_SKIP)
>