netdev - Re: [PATCH bpf-next 1/3] libbpf: Add names for auxiliary maps

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Date:   Fri, 4 Feb 2022 15:04:21 -0800
From:   Andrii Nakryiko <andrii.nakryiko@...il.com>
To:     Jiri Olsa <jolsa@...hat.com>
Cc:     Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Andrii Nakryiko <andrii@...nel.org>,
        Networking <netdev@...r.kernel.org>, bpf <bpf@...r.kernel.org>,
        Martin KaFai Lau <kafai@...com>,
        Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>,
        John Fastabend <john.fastabend@...il.com>,
        KP Singh <kpsingh@...omium.org>,
        Toke Høiland-Jørgensen <toke@...hat.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Jiri Pirko <jiri@...lanox.com>
Subject: Re: [PATCH bpf-next 1/3] libbpf: Add names for auxiliary maps

On Fri, Feb 4, 2022 at 2:58 PM Jiri Olsa <jolsa@...hat.com> wrote:
>
> Adding names for maps that bpftool uses for various detections.
> These maps can appear in final map show output (due to deferred
> removal in kernel) so some tests (like test_offload.py) needs
> to filter them out.
>
> Signed-off-by: Jiri Olsa <jolsa@...nel.org>
> ---
>  tools/lib/bpf/libbpf.c | 6 +++---
>  1 file changed, 3 insertions(+), 3 deletions(-)
>
> diff --git a/tools/lib/bpf/libbpf.c b/tools/lib/bpf/libbpf.c
> index 904cdf83002b..38294ce935d6 100644
> --- a/tools/lib/bpf/libbpf.c
> +++ b/tools/lib/bpf/libbpf.c
> @@ -4412,7 +4412,7 @@ static int probe_kern_global_data(void)
>         };
>         int ret, map, insn_cnt = ARRAY_SIZE(insns);
>
> -       map = bpf_map_create(BPF_MAP_TYPE_ARRAY, NULL, sizeof(int), 32, 1, NULL);
> +       map = bpf_map_create(BPF_MAP_TYPE_ARRAY, "global_data", sizeof(int), 32, 1, NULL);

some old kernel versions don't support map names, so you can't just
blindly specify them and log error

I'd rather fix test_offload.py instead of "fixing" libbpf.


>         if (map < 0) {
>                 ret = -errno;
>                 cp = libbpf_strerror_r(ret, errmsg, sizeof(errmsg));
> @@ -4545,7 +4545,7 @@ static int probe_kern_array_mmap(void)
>         LIBBPF_OPTS(bpf_map_create_opts, opts, .map_flags = BPF_F_MMAPABLE);
>         int fd;
>
> -       fd = bpf_map_create(BPF_MAP_TYPE_ARRAY, NULL, sizeof(int), sizeof(int), 1, &opts);
> +       fd = bpf_map_create(BPF_MAP_TYPE_ARRAY, "array_mmap", sizeof(int), sizeof(int), 1, &opts);
>         return probe_fd(fd);
>  }
>
> @@ -4592,7 +4592,7 @@ static int probe_prog_bind_map(void)
>         };
>         int ret, map, prog, insn_cnt = ARRAY_SIZE(insns);
>
> -       map = bpf_map_create(BPF_MAP_TYPE_ARRAY, NULL, sizeof(int), 32, 1, NULL);
> +       map = bpf_map_create(BPF_MAP_TYPE_ARRAY, "bind_map_detect", sizeof(int), 32, 1, NULL);
>         if (map < 0) {
>                 ret = -errno;
>                 cp = libbpf_strerror_r(ret, errmsg, sizeof(errmsg));
> --
> 2.34.1
>