netdev - Re: [PATCH bpf-next] libbpf: add debug message for each created program

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Date:   Tue, 23 Jun 2020 23:47:36 -0700
From:   Alexei Starovoitov <alexei.starovoitov@...il.com>
To:     Andrii Nakryiko <andriin@...com>
Cc:     bpf <bpf@...r.kernel.org>,
        Network Development <netdev@...r.kernel.org>,
        Alexei Starovoitov <ast@...com>,
        Daniel Borkmann <daniel@...earbox.net>,
        Andrii Nakryiko <andrii.nakryiko@...il.com>,
        Kernel Team <kernel-team@...com>
Subject: Re: [PATCH bpf-next] libbpf: add debug message for each created program

On Tue, Jun 23, 2020 at 5:34 PM Andrii Nakryiko <andriin@...com> wrote:
>
> Similar message for map creation is extremely useful, so add similar for BPF
> programs.

'extremely useful' is quite subjective.
If we land this patch then everyone will be allowed to add pr_debug()
everywhere in libbpf with the same reasoning: "it's extremely useful pr_debug".

> Signed-off-by: Andrii Nakryiko <andriin@...com>
> ---
>  tools/lib/bpf/libbpf.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
>
> diff --git a/tools/lib/bpf/libbpf.c b/tools/lib/bpf/libbpf.c
> index 18461deb1b19..f24a90c86c58 100644
> --- a/tools/lib/bpf/libbpf.c
> +++ b/tools/lib/bpf/libbpf.c
> @@ -5379,8 +5379,9 @@ load_program(struct bpf_program *prog, struct bpf_insn *insns, int insns_cnt,
>         }
>
>         ret = bpf_load_program_xattr(&load_attr, log_buf, log_buf_size);
> -
>         if (ret >= 0) {
> +               pr_debug("prog '%s' ('%s'): created successfully, fd=%d\n",
> +                        prog->name, prog->section_name, ret);
>                 if (log_buf && load_attr.log_level)
>                         pr_debug("verifier log:\n%s", log_buf);
>                 *pfd = ret;
> --
> 2.24.1
>