netdev - Re: [PATCH v9 bpf-next 3/3] bpf: add selftest for BPF_ENABLE

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Date:   Thu, 30 Apr 2020 11:16:01 -0700
From:   Andrii Nakryiko <andrii.nakryiko@...il.com>
To:     Song Liu <songliubraving@...com>
Cc:     bpf <bpf@...r.kernel.org>, Networking <netdev@...r.kernel.org>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Kernel Team <kernel-team@...com>
Subject: Re: [PATCH v9 bpf-next 3/3] bpf: add selftest for BPF_ENABLE_STATS

On Thu, Apr 30, 2020 at 12:16 AM Song Liu <songliubraving@...com> wrote:
>
> Add test for BPF_ENABLE_STATS, which should enable run_time_ns stats.
>
> ~/selftests/bpf# ./test_progs -t enable_stats  -v
> test_enable_stats:PASS:skel_open_and_load 0 nsec
> test_enable_stats:PASS:get_stats_fd 0 nsec
> test_enable_stats:PASS:attach_raw_tp 0 nsec
> test_enable_stats:PASS:get_prog_info 0 nsec
> test_enable_stats:PASS:check_stats_enabled 0 nsec
> test_enable_stats:PASS:check_run_cnt_valid 0 nsec
> Summary: 1/0 PASSED, 0 SKIPPED, 0 FAILED
>
> Signed-off-by: Song Liu <songliubraving@...com>
> ---

LGTM.

Acked-by: Andrii Nakryiko <andriin@...com>

>  .../selftests/bpf/prog_tests/enable_stats.c   | 45 +++++++++++++++++++
>  .../selftests/bpf/progs/test_enable_stats.c   | 18 ++++++++
>  2 files changed, 63 insertions(+)
>  create mode 100644 tools/testing/selftests/bpf/prog_tests/enable_stats.c
>  create mode 100644 tools/testing/selftests/bpf/progs/test_enable_stats.c
>

[...]

> +       stats_fd = bpf_enable_stats(BPF_STATS_RUN_TIME);
> +       if (CHECK(stats_fd < 0, "get_stats_fd", "failed %d\n", errno)) {
> +               test_enable_stats__destroy(skel);
> +               return;
> +       }
> +
> +       err = test_enable_stats__attach(skel);
> +       if (CHECK(err, "attach_raw_tp", "err %d\n", err))
> +               goto cleanup;
> +
> +       test_enable_stats__detach(skel);

It's a bit subtle that we rely on detach (which does close()) to
trigger attached program :) But it works!

> +
> +       prog_fd = bpf_program__fd(skel->progs.test_enable_stats);
> +       memset(&info, 0, info_len);
> +       err = bpf_obj_get_info_by_fd(prog_fd, &info, &info_len);
> +       if (CHECK(err, "get_prog_info",
> +                 "failed to get bpf_prog_info for fd %d\n", prog_fd))
> +               goto cleanup;
> +       if (CHECK(info.run_time_ns == 0, "check_stats_enabled",
> +                 "failed to enable run_time_ns stats\n"))
> +               goto cleanup;
> +
> +       CHECK(info.run_cnt != skel->bss->count, "check_run_cnt_valid",
> +             "invalid run_cnt stats\n");
> +

[...]