netdev - Re: [PATCHv3 bpf-next 5/7] selftests/bpf: Add test for bpf_get_func

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Message-ID: <CAEf4BzZxDAQZ4Y5n8uCjvrEgmr51CY3AQ8y7zM_Hoh+7zqd6DA@mail.gmail.com>
Date:   Wed, 7 Jul 2021 17:12:07 -0700
From:   Andrii Nakryiko <andrii.nakryiko@...il.com>
To:     Jiri Olsa <jolsa@...hat.com>
Cc:     Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Andrii Nakryiko <andriin@...com>,
        Networking <netdev@...r.kernel.org>, bpf <bpf@...r.kernel.org>,
        Martin KaFai Lau <kafai@...com>,
        Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>,
        John Fastabend <john.fastabend@...il.com>,
        KP Singh <kpsingh@...omium.org>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Alan Maguire <alan.maguire@...cle.com>
Subject: Re: [PATCHv3 bpf-next 5/7] selftests/bpf: Add test for
 bpf_get_func_ip helper

On Wed, Jul 7, 2021 at 2:54 PM Jiri Olsa <jolsa@...hat.com> wrote:
>
> Adding test for bpf_get_func_ip helper for fentry, fexit,
> kprobe, kretprobe and fmod_ret programs.
>
> Signed-off-by: Jiri Olsa <jolsa@...nel.org>
> ---
>  .../bpf/prog_tests/get_func_ip_test.c         | 42 +++++++++++++
>  .../selftests/bpf/progs/get_func_ip_test.c    | 62 +++++++++++++++++++
>  2 files changed, 104 insertions(+)
>  create mode 100644 tools/testing/selftests/bpf/prog_tests/get_func_ip_test.c
>  create mode 100644 tools/testing/selftests/bpf/progs/get_func_ip_test.c
>

[...]

> +       ASSERT_OK(err, "test_run");
> +
> +       result = (__u64 *)skel->bss;
> +       for (i = 0; i < sizeof(*skel->bss) / sizeof(__u64); i++) {
> +               if (!ASSERT_EQ(result[i], 1, "fentry_result"))
> +                       break;
> +       }

I dislike such generic loop over results. It's super error prone and
takes the same 5 lines of code that you'd write for explicit

ASSERT_EQ(testX_result, 1, "testX_result"); /* 5 times */

> +
> +       get_func_ip_test__detach(skel);

no need to explicitly detach, __destroy does that automatically

> +
> +cleanup:
> +       get_func_ip_test__destroy(skel);
> +}

[...]