linux-kernel - Re: [PATCH bpf-next 2/4] selftests/bpf: add non-BPF

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Date:   Mon, 11 Jan 2021 23:06:38 -0800
From:   Andrii Nakryiko <andrii.nakryiko@...il.com>
To:     Song Liu <songliubraving@...com>
Cc:     bpf <bpf@...r.kernel.org>, Networking <netdev@...r.kernel.org>,
        open list <linux-kernel@...r.kernel.org>,
        Ingo Molnar <mingo@...hat.com>,
        Peter Ziljstra <peterz@...radead.org>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Andrii Nakryiko <andrii@...nel.org>,
        john fastabend <john.fastabend@...il.com>,
        KP Singh <kpsingh@...omium.org>,
        Kernel Team <kernel-team@...com>, Hao Luo <haoluo@...gle.com>
Subject: Re: [PATCH bpf-next 2/4] selftests/bpf: add non-BPF_LSM test for task
 local storage

On Fri, Jan 8, 2021 at 3:30 PM Song Liu <songliubraving@...com> wrote:
>
> Task local storage is enabled for tracing programs. Add a test for it
> without CONFIG_BPF_LSM.
>
> Signed-off-by: Song Liu <songliubraving@...com>
> ---
>  .../bpf/prog_tests/test_task_local_storage.c  | 34 +++++++++++++++++
>  .../selftests/bpf/progs/task_local_storage.c  | 37 +++++++++++++++++++
>  2 files changed, 71 insertions(+)
>  create mode 100644 tools/testing/selftests/bpf/prog_tests/test_task_local_storage.c
>  create mode 100644 tools/testing/selftests/bpf/progs/task_local_storage.c
>
> diff --git a/tools/testing/selftests/bpf/prog_tests/test_task_local_storage.c b/tools/testing/selftests/bpf/prog_tests/test_task_local_storage.c
> new file mode 100644
> index 0000000000000..7de7a154ebbe6
> --- /dev/null
> +++ b/tools/testing/selftests/bpf/prog_tests/test_task_local_storage.c
> @@ -0,0 +1,34 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/* Copyright (c) 2020 Facebook */
> +
> +#include <sys/types.h>
> +#include <unistd.h>
> +#include <test_progs.h>
> +#include "task_local_storage.skel.h"
> +
> +static unsigned int duration;
> +
> +void test_test_task_local_storage(void)

nit: let's not use "test_test_" tautology. It can be simply
test_task_local_storage() and this file itself should be called
task_local_storage.c.

> +{
> +       struct task_local_storage *skel;
> +       const int count = 10;
> +       int i, err;
> +
> +       skel = task_local_storage__open_and_load();
> +
> +       if (CHECK(!skel, "skel_open_and_load", "skeleton open and load failed\n"))

btw, can you ASSERT_OK_PTR(skel, "skel_open_and_load"); and save
yourself a bunch of typing

> +               return;
> +
> +       err = task_local_storage__attach(skel);
> +
> +       if (CHECK(err, "skel_attach", "skeleton attach failed\n"))
> +               goto out;

similarly, ASSERT_OK(err, "skel_attach")

> +
> +       for (i = 0; i < count; i++)
> +               usleep(1000);
> +       CHECK(skel->bss->value < count, "task_local_storage_value",
> +             "task local value too small\n");
> +
> +out:
> +       task_local_storage__destroy(skel);
> +}

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