netdev - Re: [PATCH] selftests: net: devlink_port_split.py: skip test if no suitable device available

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Date:   Mon, 6 Mar 2023 10:33:16 -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: [PATCH] selftests: net: devlink_port_split.py: skip test if no
 suitable device available

On Mon,  6 Mar 2023 19:19:59 +0800 Po-Hsu Lin wrote:
> The `devlink -j dev show` command output may not contain the "flavour"
> key, for example:
>   $ devlink -j dev show
>   {"dev":{"pci/0001:00:00.0":{},"pci/0002:00:00.0":{}}}

It's not dev that's supposed to have the flavor, it's port.

  devlink -j port show

Are you running with old kernel or old user space?
Flavor is not an optional attribute.

> This will cause a KeyError exception. Fix this by checking the key
> existence first.
> 
> Also, if max lanes is 0 the port splitting won't be tested at all.
> but the script will end normally and thus causing a false-negative
> test result.
> 
> Use a test_ran flag to determine if these tests were skipped and
> return KSFT_SKIP accordingly.
> 
> Link: https://bugs.launchpad.net/bugs/1937133
> Fixes: f3348a82e727 ("selftests: net: Add port split test")
> Signed-off-by: Po-Hsu Lin <po-hsu.lin@...onical.com>

Could you factor out the existing skipping logic from main()
(the code under "if not dev:") and add the test for flavors
to the same function? It'll be a bit more code but cleaner
result IMHO.