netdev - Re: [PATCH v4 bpf-next 5/5] selftests/bpf: add tests for uprobe auto-attach via skeleton

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Date:   Tue, 15 Mar 2022 21:33:26 -0700
From:   Andrii Nakryiko <andrii.nakryiko@...il.com>
To:     Alan Maguire <alan.maguire@...cle.com>
Cc:     Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Andrii Nakryiko <andrii@...nel.org>, Martin Lau <kafai@...com>,
        Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>,
        john fastabend <john.fastabend@...il.com>,
        KP Singh <kpsingh@...nel.org>,
        Toke Høiland-Jørgensen <toke@...hat.com>,
        Yucong Sun <sunyucong@...il.com>,
        Networking <netdev@...r.kernel.org>, bpf <bpf@...r.kernel.org>
Subject: Re: [PATCH v4 bpf-next 5/5] selftests/bpf: add tests for uprobe
 auto-attach via skeleton

On Fri, Mar 11, 2022 at 4:11 AM Alan Maguire <alan.maguire@...cle.com> wrote:
>
> tests that verify auto-attach works for function entry/return for
> local functions in program, library functions in program and library
> functions in library.
>
> Signed-off-by: Alan Maguire <alan.maguire@...cle.com>
> ---
>  .../selftests/bpf/prog_tests/uprobe_autoattach.c   | 48 +++++++++++++++
>  .../selftests/bpf/progs/test_uprobe_autoattach.c   | 69 ++++++++++++++++++++++
>  2 files changed, 117 insertions(+)
>  create mode 100644 tools/testing/selftests/bpf/prog_tests/uprobe_autoattach.c
>  create mode 100644 tools/testing/selftests/bpf/progs/test_uprobe_autoattach.c
>
> diff --git a/tools/testing/selftests/bpf/prog_tests/uprobe_autoattach.c b/tools/testing/selftests/bpf/prog_tests/uprobe_autoattach.c
> new file mode 100644
> index 0000000..57ed636
> --- /dev/null
> +++ b/tools/testing/selftests/bpf/prog_tests/uprobe_autoattach.c
> @@ -0,0 +1,48 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/* Copyright (c) 2022, Oracle and/or its affiliates. */
> +
> +#include <test_progs.h>
> +#include "test_uprobe_autoattach.skel.h"
> +
> +/* uprobe attach point */
> +static void autoattach_trigger_func(void)
> +{
> +       asm volatile ("");
> +}
> +
> +void test_uprobe_autoattach(void)
> +{
> +       struct test_uprobe_autoattach *skel;
> +       char *mem;
> +
> +       skel = test_uprobe_autoattach__open_and_load();
> +       if (!ASSERT_OK_PTR(skel, "skel_open"))
> +               return;
> +       if (!ASSERT_OK_PTR(skel->bss, "check_bss"))
> +               goto cleanup;

no need to check skel->bss, a lot of tests will be broken if that doesn't work

> +
> +       if (!ASSERT_OK(test_uprobe_autoattach__attach(skel), "skel_attach"))
> +               goto cleanup;
> +
> +       /* trigger & validate uprobe & uretprobe */
> +       autoattach_trigger_func();
> +
> +       /* trigger & validate shared library u[ret]probes attached by name */
> +       mem = malloc(1);
> +       free(mem);
> +
> +       if (!ASSERT_EQ(skel->bss->uprobe_byname_res, 1, "check_uprobe_byname_res"))
> +               goto cleanup;
> +       if (!ASSERT_EQ(skel->bss->uretprobe_byname_res, 2, "check_uretprobe_byname_res"))
> +               goto cleanup;
> +       if (!ASSERT_EQ(skel->bss->uprobe_byname2_res, 3, "check_uprobe_byname2_res"))
> +               goto cleanup;
> +       if (!ASSERT_EQ(skel->bss->uretprobe_byname2_res, 4, "check_uretprobe_byname2_res"))
> +               goto cleanup;
> +       if (!ASSERT_EQ(skel->bss->uprobe_byname3_res, 5, "check_uprobe_byname3_res"))
> +               goto cleanup;
> +       if (!ASSERT_EQ(skel->bss->uretprobe_byname3_res, 6, "check_uretprobe_byname3_res"))
> +               goto cleanup;

same about goto cleanup, for such sequences of value checks it's nice
and succinct to just use unconditional sequence of ASSERT_EQ()s

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

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