netdev - Re: [PATCH v2 bpf-next 12/12] selftests/bpf: add kfree_skb raw

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Message-ID: <CAEf4BzbDQH6AaSJdA5YUTQiAH8co_nBbZZ30W=8k+JB_xPWEMA@mail.gmail.com>
Date:   Fri, 11 Oct 2019 12:05:32 -0700
From:   Andrii Nakryiko <andrii.nakryiko@...il.com>
To:     Alexei Starovoitov <ast@...nel.org>
Cc:     "David S. Miller" <davem@...emloft.net>,
        Daniel Borkmann <daniel@...earbox.net>, x86@...nel.org,
        Networking <netdev@...r.kernel.org>, bpf <bpf@...r.kernel.org>,
        Kernel Team <kernel-team@...com>
Subject: Re: [PATCH v2 bpf-next 12/12] selftests/bpf: add kfree_skb raw_tp test

On Wed, Oct 9, 2019 at 9:15 PM Alexei Starovoitov <ast@...nel.org> wrote:
>
> Load basic cls_bpf program.
> Load raw_tracepoint program and attach to kfree_skb raw tracepoint.
> Trigger cls_bpf via prog_test_run.
> At the end of test_run kernel will call kfree_skb
> which will trigger trace_kfree_skb tracepoint.
> Which will call our raw_tracepoint program.
> Which will take that skb and will dump it into perf ring buffer.
> Check that user space received correct packet.
>
> Signed-off-by: Alexei Starovoitov <ast@...nel.org>
> Acked-by: Andrii Nakryiko <andriin@...com>
> ---
>  .../selftests/bpf/prog_tests/kfree_skb.c      | 90 +++++++++++++++++++
>  tools/testing/selftests/bpf/progs/kfree_skb.c | 74 +++++++++++++++
>  2 files changed, 164 insertions(+)
>  create mode 100644 tools/testing/selftests/bpf/prog_tests/kfree_skb.c
>  create mode 100644 tools/testing/selftests/bpf/progs/kfree_skb.c
>

[...]

> +
> +void test_kfree_skb(void)
> +{
> +       struct bpf_prog_load_attr attr = {
> +               .file = "./kfree_skb.o",
> +               .log_level = 2,

This is rather verbose and memory-consuming. Do you really want to
leave it at 2?


> +       };
> +
> +       struct bpf_object *obj, *obj2 = NULL;
> +       struct perf_buffer_opts pb_opts = {};
> +       struct perf_buffer *pb = NULL;
> +       struct bpf_link *link = NULL;
> +       struct bpf_map *perf_buf_map;
> +       struct bpf_program *prog;
> +       __u32 duration, retval;
> +       int err, pkt_fd, kfree_skb_fd;
> +       bool passed = false;
> +

[...]