netdev - Re: [PATCH v2 bpf-next 3/3] selftests/bpf: add raw_tp_test

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Date:   Wed, 23 Sep 2020 12:40:51 -0700
From:   Andrii Nakryiko <andrii.nakryiko@...il.com>
To:     Song Liu <songliubraving@...com>
Cc:     Networking <netdev@...r.kernel.org>, bpf <bpf@...r.kernel.org>,
        Kernel Team <kernel-team@...com>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        john fastabend <john.fastabend@...il.com>,
        KP Singh <kpsingh@...omium.org>
Subject: Re: [PATCH v2 bpf-next 3/3] selftests/bpf: add raw_tp_test_run

On Wed, Sep 23, 2020 at 9:55 AM Song Liu <songliubraving@...com> wrote:
>
> This test runs test_run for raw_tracepoint program. The test covers ctx
> input, retval output, and proper handling of cpu_plus field.
>
> Signed-off-by: Song Liu <songliubraving@...com>
> ---
>  .../bpf/prog_tests/raw_tp_test_run.c          | 73 +++++++++++++++++++
>  .../bpf/progs/test_raw_tp_test_run.c          | 26 +++++++
>  2 files changed, 99 insertions(+)
>  create mode 100644 tools/testing/selftests/bpf/prog_tests/raw_tp_test_run.c
>  create mode 100644 tools/testing/selftests/bpf/progs/test_raw_tp_test_run.c
>
> diff --git a/tools/testing/selftests/bpf/prog_tests/raw_tp_test_run.c b/tools/testing/selftests/bpf/prog_tests/raw_tp_test_run.c
> new file mode 100644
> index 0000000000000..3c6523b61afc1
> --- /dev/null
> +++ b/tools/testing/selftests/bpf/prog_tests/raw_tp_test_run.c
> @@ -0,0 +1,73 @@
> +// SPDX-License-Identifier: GPL-2.0-only
> +/* Copyright (c) 2019 Facebook */
> +#include <test_progs.h>
> +#include "bpf/libbpf_internal.h"
> +#include "test_raw_tp_test_run.skel.h"
> +
> +static int duration;
> +
> +void test_raw_tp_test_run(void)
> +{
> +       struct bpf_prog_test_run_attr test_attr = {};
> +       __u64 args[2] = {0x1234ULL, 0x5678ULL};
> +       int comm_fd = -1, err, nr_online, i;
> +       int expected_retval = 0x1234 + 0x5678;
> +       struct test_raw_tp_test_run *skel;
> +       char buf[] = "new_name";
> +       bool *online = NULL;
> +
> +       err = parse_cpu_mask_file("/sys/devices/system/cpu/online", &online,
> +                                 &nr_online);
> +       if (CHECK(err, "parse_cpu_mask_file", "err %d\n", err))
> +               return;
> +
> +       skel = test_raw_tp_test_run__open_and_load();
> +       if (CHECK(!skel, "skel_open", "failed to open skeleton\n"))
> +               return;

leaking memory here

> +       err = test_raw_tp_test_run__attach(skel);
> +       if (CHECK(err, "skel_attach", "skeleton attach failed: %d\n", err))
> +               goto cleanup;
> +
> +       comm_fd = open("/proc/self/comm", O_WRONLY|O_TRUNC);
> +       if (CHECK(comm_fd < 0, "open /proc/self/comm", "err %d\n", errno))
> +               goto cleanup;
> +

[...]

> +SEC("raw_tp/task_rename")
> +int BPF_PROG(rename, struct task_struct *task, char *comm)
> +{
> +
> +       count++;
> +       if ((unsigned long long) task == 0x1234 &&
> +           (unsigned long long) comm == 0x5678) {

you can use shorter __u64?

> +               on_cpu = bpf_get_smp_processor_id();
> +               return (int)task + (int)comm;
> +       }
> +
> +       return 0;
> +}
> +
> +char _license[] SEC("license") = "GPL";
> --
> 2.24.1
>