netdev - Re: [PATCH v2 bpf-next 4/4] selftests/bpf: add bpf_iter test with bpf_get_task

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Date:   Fri, 26 Jun 2020 13:21:03 -0700
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>,
        Peter Ziljstra <peterz@...radead.org>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Kernel Team <kernel-team@...com>,
        john fastabend <john.fastabend@...il.com>,
        KP Singh <kpsingh@...omium.org>
Subject: Re: [PATCH v2 bpf-next 4/4] selftests/bpf: add bpf_iter test with bpf_get_task_stack()

On Thu, Jun 25, 2020 at 5:15 PM Song Liu <songliubraving@...com> wrote:
>
> The new test is similar to other bpf_iter tests.
>
> Signed-off-by: Song Liu <songliubraving@...com>
> ---
>  .../selftests/bpf/prog_tests/bpf_iter.c       | 17 ++++++
>  .../selftests/bpf/progs/bpf_iter_task_stack.c | 60 +++++++++++++++++++
>  2 files changed, 77 insertions(+)
>  create mode 100644 tools/testing/selftests/bpf/progs/bpf_iter_task_stack.c
>
> diff --git a/tools/testing/selftests/bpf/prog_tests/bpf_iter.c b/tools/testing/selftests/bpf/prog_tests/bpf_iter.c
> index 87c29dde1cf96..baa83328f810d 100644
> --- a/tools/testing/selftests/bpf/prog_tests/bpf_iter.c
> +++ b/tools/testing/selftests/bpf/prog_tests/bpf_iter.c
> @@ -5,6 +5,7 @@
>  #include "bpf_iter_netlink.skel.h"
>  #include "bpf_iter_bpf_map.skel.h"
>  #include "bpf_iter_task.skel.h"
> +#include "bpf_iter_task_stack.skel.h"
>  #include "bpf_iter_task_file.skel.h"
>  #include "bpf_iter_test_kern1.skel.h"
>  #include "bpf_iter_test_kern2.skel.h"
> @@ -106,6 +107,20 @@ static void test_task(void)
>         bpf_iter_task__destroy(skel);
>  }
>
> +static void test_task_stack(void)
> +{
> +       struct bpf_iter_task_stack *skel;
> +
> +       skel = bpf_iter_task_stack__open_and_load();
> +       if (CHECK(!skel, "bpf_iter_task_stack__open_and_load",
> +                 "skeleton open_and_load failed\n"))
> +               return;
> +
> +       do_dummy_read(skel->progs.dump_task_stack);
> +
> +       bpf_iter_task_stack__destroy(skel);
> +}
> +
>  static void test_task_file(void)
>  {
>         struct bpf_iter_task_file *skel;
> @@ -392,6 +407,8 @@ void test_bpf_iter(void)
>                 test_bpf_map();
>         if (test__start_subtest("task"))
>                 test_task();
> +       if (test__start_subtest("task_stack"))
> +               test_task_stack();
>         if (test__start_subtest("task_file"))
>                 test_task_file();
>         if (test__start_subtest("anon"))
> diff --git a/tools/testing/selftests/bpf/progs/bpf_iter_task_stack.c b/tools/testing/selftests/bpf/progs/bpf_iter_task_stack.c
> new file mode 100644
> index 0000000000000..83aca5b1a7965
> --- /dev/null
> +++ b/tools/testing/selftests/bpf/progs/bpf_iter_task_stack.c
> @@ -0,0 +1,60 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/* Copyright (c) 2020 Facebook */
> +/* "undefine" structs in vmlinux.h, because we "override" them below */
> +#define bpf_iter_meta bpf_iter_meta___not_used
> +#define bpf_iter__task bpf_iter__task___not_used
> +#include "vmlinux.h"
> +#undef bpf_iter_meta
> +#undef bpf_iter__task
> +#include <bpf/bpf_helpers.h>
> +#include <bpf/bpf_tracing.h>
> +
> +char _license[] SEC("license") = "GPL";
> +
> +/* bpf_get_task_stack needs a stackmap to work */

no it doesn't anymore :) please drop


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