netdev - Re: [PATCH bpf-next 7/8] selftests/bpf: add test for BTF-defined maps

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Date:   Sat, 15 Jun 2019 15:05:14 -0700
From:   Song Liu <liu.song.a23@...il.com>
To:     Andrii Nakryiko <andriin@...com>
Cc:     Andrii Nakryiko <andrii.nakryiko@...il.com>,
        bpf <bpf@...r.kernel.org>, Networking <netdev@...r.kernel.org>,
        Alexei Starovoitov <ast@...com>,
        Daniel Borkmann <daniel@...earbox.net>,
        Kernel Team <kernel-team@...com>
Subject: Re: [PATCH bpf-next 7/8] selftests/bpf: add test for BTF-defined maps

On Mon, Jun 10, 2019 at 9:49 PM Andrii Nakryiko <andriin@...com> wrote:
>
> Add file test for BTF-defined map definition.
>
> Signed-off-by: Andrii Nakryiko <andriin@...com>

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

> ---
>  .../selftests/bpf/progs/test_btf_newkv.c      | 73 +++++++++++++++++++
>  tools/testing/selftests/bpf/test_btf.c        | 10 +--
>  2 files changed, 76 insertions(+), 7 deletions(-)
>  create mode 100644 tools/testing/selftests/bpf/progs/test_btf_newkv.c
>
> diff --git a/tools/testing/selftests/bpf/progs/test_btf_newkv.c b/tools/testing/selftests/bpf/progs/test_btf_newkv.c
> new file mode 100644
> index 000000000000..28c16bb583b6
> --- /dev/null
> +++ b/tools/testing/selftests/bpf/progs/test_btf_newkv.c
> @@ -0,0 +1,73 @@
> +/* SPDX-License-Identifier: GPL-2.0 */
> +/* Copyright (c) 2018 Facebook */
> +#include <linux/bpf.h>
> +#include "bpf_helpers.h"
> +
> +int _version SEC("version") = 1;
> +
> +struct ipv_counts {
> +       unsigned int v4;
> +       unsigned int v6;
> +};
> +
> +/* just to validate we can handle maps in multiple sections */
> +struct bpf_map_def SEC("maps") btf_map_legacy = {
> +       .type = BPF_MAP_TYPE_ARRAY,
> +       .key_size = sizeof(int),
> +       .value_size = sizeof(long long),
> +       .max_entries = 4,
> +};
> +
> +BPF_ANNOTATE_KV_PAIR(btf_map_legacy, int, struct ipv_counts);
> +
> +struct {
> +       int *key;
> +       struct ipv_counts *value;
> +       unsigned int type;
> +       unsigned int max_entries;
> +} btf_map SEC(".maps") = {
> +       .type = BPF_MAP_TYPE_ARRAY,
> +       .max_entries = 4,
> +};
> +
> +struct dummy_tracepoint_args {
> +       unsigned long long pad;
> +       struct sock *sock;
> +};
> +
> +__attribute__((noinline))
> +static int test_long_fname_2(struct dummy_tracepoint_args *arg)
> +{
> +       struct ipv_counts *counts;
> +       int key = 0;
> +
> +       if (!arg->sock)
> +               return 0;
> +
> +       counts = bpf_map_lookup_elem(&btf_map, &key);
> +       if (!counts)
> +               return 0;
> +
> +       counts->v6++;
> +
> +       /* just verify we can reference both maps */
> +       counts = bpf_map_lookup_elem(&btf_map_legacy, &key);
> +       if (!counts)
> +               return 0;
> +
> +       return 0;
> +}
> +
> +__attribute__((noinline))
> +static int test_long_fname_1(struct dummy_tracepoint_args *arg)
> +{
> +       return test_long_fname_2(arg);
> +}
> +
> +SEC("dummy_tracepoint")
> +int _dummy_tracepoint(struct dummy_tracepoint_args *arg)
> +{
> +       return test_long_fname_1(arg);
> +}
> +
> +char _license[] SEC("license") = "GPL";
> diff --git a/tools/testing/selftests/bpf/test_btf.c b/tools/testing/selftests/bpf/test_btf.c
> index 289daf54dec4..8351cb5f4a20 100644
> --- a/tools/testing/selftests/bpf/test_btf.c
> +++ b/tools/testing/selftests/bpf/test_btf.c
> @@ -4016,13 +4016,9 @@ struct btf_file_test {
>  };
>
>  static struct btf_file_test file_tests[] = {
> -{
> -       .file = "test_btf_haskv.o",
> -},
> -{
> -       .file = "test_btf_nokv.o",
> -       .btf_kv_notfound = true,
> -},
> +       { .file = "test_btf_haskv.o", },
> +       { .file = "test_btf_newkv.o", },
> +       { .file = "test_btf_nokv.o", .btf_kv_notfound = true, },
>  };
>
>  static int do_test_file(unsigned int test_num)
> --
> 2.17.1
>