netdev - Re: [PATCH v2 bpf-next 7/7] selftests/bpf: Add unit tests for global functions

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Date:   Thu, 9 Jan 2020 09:27:26 -0800
From:   Song Liu <song@...nel.org>
To:     Alexei Starovoitov <ast@...nel.org>
Cc:     "David S . Miller" <davem@...emloft.net>,
        Daniel Borkmann <daniel@...earbox.net>,
        Networking <netdev@...r.kernel.org>, bpf <bpf@...r.kernel.org>,
        Kernel Team <kernel-team@...com>
Subject: Re: [PATCH v2 bpf-next 7/7] selftests/bpf: Add unit tests for global functions

On Wed, Jan 8, 2020 at 10:39 PM Alexei Starovoitov <ast@...nel.org> wrote:
>
> test_global_func[12] - check 512 stack limit.
> test_global_func[34] - check 8 frame call chain limit.
> test_global_func5    - check that non-ctx pointer cannot be passed into
>                        a function that expects context.
> test_global_func6    - check that ctx pointer is unmodified.
>
> Signed-off-by: Alexei Starovoitov <ast@...nel.org>

Acked-by: Song Liu <songliubraving@...com>

> ---
>  .../bpf/prog_tests/test_global_funcs.c        | 81 +++++++++++++++++++
>  .../selftests/bpf/progs/test_global_func1.c   | 45 +++++++++++
>  .../selftests/bpf/progs/test_global_func2.c   |  4 +
>  .../selftests/bpf/progs/test_global_func3.c   | 65 +++++++++++++++
>  .../selftests/bpf/progs/test_global_func4.c   |  4 +
>  .../selftests/bpf/progs/test_global_func5.c   | 31 +++++++
>  .../selftests/bpf/progs/test_global_func6.c   | 31 +++++++
>  7 files changed, 261 insertions(+)
>  create mode 100644 tools/testing/selftests/bpf/prog_tests/test_global_funcs.c
>  create mode 100644 tools/testing/selftests/bpf/progs/test_global_func1.c
>  create mode 100644 tools/testing/selftests/bpf/progs/test_global_func2.c
>  create mode 100644 tools/testing/selftests/bpf/progs/test_global_func3.c
>  create mode 100644 tools/testing/selftests/bpf/progs/test_global_func4.c
>  create mode 100644 tools/testing/selftests/bpf/progs/test_global_func5.c
>  create mode 100644 tools/testing/selftests/bpf/progs/test_global_func6.c
>
> diff --git a/tools/testing/selftests/bpf/prog_tests/test_global_funcs.c b/tools/testing/selftests/bpf/prog_tests/test_global_funcs.c
> new file mode 100644
> index 000000000000..bc588fa87d65
> --- /dev/null
> +++ b/tools/testing/selftests/bpf/prog_tests/test_global_funcs.c
> @@ -0,0 +1,81 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/* Copyright (c) 2020 Facebook */
> +#include <test_progs.h>
> +
> +const char *err_str;
> +bool found;
> +
> +static int libbpf_debug_print(enum libbpf_print_level level,
> +                             const char *format, va_list args)
> +{
> +       char *log_buf;
> +
> +       if (level != LIBBPF_WARN ||
> +           strcmp(format, "libbpf: \n%s\n")) {
> +               vprintf(format, args);
> +               return 0;
> +       }
> +
> +       log_buf = va_arg(args, char *);
> +       if (!log_buf)
> +               goto out;
> +       if (strstr(log_buf, err_str) == 0)
> +               found = true;
> +out:
> +       printf(format, log_buf);
> +       return 0;
> +}

libbpf_debug_print() looks very useful. Maybe we can move it to some
header files?

Thanks,
Song