Re: [PATCH v2 bpf-next] selftests/bpf: Improve by-name subtest selection logic in prog_tests

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On Wed, Apr 6, 2022 at 1:37 PM Mykola Lysenko <mykolal@xxxxxx> wrote:
>
> Improve subtest selection logic when using -t/-a/-d parameters.
> In particular, more than one subtest can be specified or a
> combination of tests / subtests.
>
> -a send_signal -d send_signal/send_signal_nmi* - runs send_signal
> test without nmi tests
>
> -a send_signal/send_signal_nmi*,find_vma - runs two send_signal
> subtests and find_vma test
>
> -a 'send_signal*' -a find_vma -d send_signal/send_signal_nmi* -
> runs 2 send_signal test and find_vma test. Disables two send_signal
> nmi subtests
>
> -t send_signal -t find_vma - runs two *send_signal* tests and one
> *find_vma* test
>
> This will allow us to have granular control over which subtests
> to disable in the CI system instead of disabling whole tests.
>
> Also, add new selftest to avoid possible regression when
> changing prog_test test name selection logic.
>
> Signed-off-by: Mykola Lysenko <mykolal@xxxxxx>
> ---

Unfortunately there is some regression introduced by these changes,
which is not easy to spot unless you try hard because of the annoying
lack of visibility into subtest results. But if you try running:

sudo ./test_progs -v -t bpf_cookie/trace

You'll notice that with our change we don't execute any subtest at
all. While before we'd execute bpf_cookie/tracepoint subtest properly.
Please take a look, must be some subtle thing somewhere.

>  .../selftests/bpf/prog_tests/arg_parsing.c    |  99 +++++++++++
>  tools/testing/selftests/bpf/test_progs.c      | 156 +++++++++---------
>  tools/testing/selftests/bpf/test_progs.h      |  15 +-
>  tools/testing/selftests/bpf/testing_helpers.c |  84 ++++++++++
>  tools/testing/selftests/bpf/testing_helpers.h |   8 +
>  5 files changed, 275 insertions(+), 87 deletions(-)
>  create mode 100644 tools/testing/selftests/bpf/prog_tests/arg_parsing.c

[...]



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