netdev - Re: [PATCH bpf 1/2] tools: bpftool: remove duplicated error message on prog load

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Message-ID: <CAPhsuW5wppE7VYznYuCMwrxUXcHc-+z6fCSzdkXjsg=FwBcatA@mail.gmail.com>
Date:   Wed, 20 Jun 2018 22:36:03 -0700
From:   Song Liu <liu.song.a23@...il.com>
To:     Jakub Kicinski <jakub.kicinski@...ronome.com>
Cc:     Alexei Starovoitov <alexei.starovoitov@...il.com>,
        Daniel Borkmann <daniel@...earbox.net>,
        Networking <netdev@...r.kernel.org>, oss-drivers@...ronome.com
Subject: Re: [PATCH bpf 1/2] tools: bpftool: remove duplicated error message
 on prog load

On Wed, Jun 20, 2018 at 11:42 AM, Jakub Kicinski
<jakub.kicinski@...ronome.com> wrote:
> do_pin_fd() will already print out an error message if something
> goes wrong.  Printing another error is unnecessary and will break
> JSON output, since error messages are full objects:
>
> $ bpftool -jp prog load tracex1_kern.o /sys/fs/bpf/a
> {
>     "error": "can't pin the object (/sys/fs/bpf/a): File exists"
> },{
>     "error": "failed to pin program"
> }
>
> Fixes: 49a086c201a9 ("bpftool: implement prog load command")
> Signed-off-by: Jakub Kicinski <jakub.kicinski@...ronome.com>
> Reviewed-by: Quentin Monnet <quentin.monnet@...ronome.com>

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

> ---
>  tools/bpf/bpftool/prog.c | 4 +---
>  1 file changed, 1 insertion(+), 3 deletions(-)
>
> diff --git a/tools/bpf/bpftool/prog.c b/tools/bpf/bpftool/prog.c
> index 05f42a46d6ed..12b694fe0404 100644
> --- a/tools/bpf/bpftool/prog.c
> +++ b/tools/bpf/bpftool/prog.c
> @@ -694,10 +694,8 @@ static int do_load(int argc, char **argv)
>                 return -1;
>         }
>
> -       if (do_pin_fd(prog_fd, argv[1])) {
> -               p_err("failed to pin program");
> +       if (do_pin_fd(prog_fd, argv[1]))
>                 return -1;
> -       }
>
>         if (json_output)
>                 jsonw_null(json_wtr);
> --
> 2.17.1
>