netdev - Re: [v4,2/4] tools: bpftool: add net detach command to detach XDP on interface

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Date:   Sun, 11 Aug 2019 17:29:13 -0700
From:   Y Song <ys114321@...il.com>
To:     "Daniel T. Lee" <danieltimlee@...il.com>
Cc:     Daniel Borkmann <daniel@...earbox.net>,
        Alexei Starovoitov <ast@...nel.org>,
        netdev <netdev@...r.kernel.org>
Subject: Re: [v4,2/4] tools: bpftool: add net detach command to detach XDP on interface

On Fri, Aug 9, 2019 at 6:35 AM Daniel T. Lee <danieltimlee@...il.com> wrote:
>
> By this commit, using `bpftool net detach`, the attached XDP prog can
> be detached. Detaching the BPF prog will be done through libbpf
> 'bpf_set_link_xdp_fd' with the progfd set to -1.
>
> Signed-off-by: Daniel T. Lee <danieltimlee@...il.com>
> ---
>  tools/bpf/bpftool/net.c | 42 ++++++++++++++++++++++++++++++++++++++++-
>  1 file changed, 41 insertions(+), 1 deletion(-)
>
> diff --git a/tools/bpf/bpftool/net.c b/tools/bpf/bpftool/net.c
> index 74cc346c36cd..ef1e576c6dba 100644
> --- a/tools/bpf/bpftool/net.c
> +++ b/tools/bpf/bpftool/net.c
> @@ -343,6 +343,43 @@ static int do_attach(int argc, char **argv)
>         return 0;
>  }
>
> +static int do_detach(int argc, char **argv)
> +{
> +       enum net_attach_type attach_type;
> +       int progfd, ifindex, err = 0;
> +
> +       /* parse detach args */
> +       if (!REQ_ARGS(3))
> +               return -EINVAL;
> +
> +       attach_type = parse_attach_type(*argv);
> +       if (attach_type == net_attach_type_size) {
> +               p_err("invalid net attach/detach type: %s", *argv);
> +               return -EINVAL;
> +       }
> +       NEXT_ARG();
> +
> +       ifindex = net_parse_dev(&argc, &argv);
> +       if (ifindex < 1)
> +               return -EINVAL;
> +
> +       /* detach xdp prog */
> +       progfd = -1;
> +       if (is_prefix("xdp", attach_type_strings[attach_type]))
> +               err = do_attach_detach_xdp(progfd, attach_type, ifindex, NULL);
> +
> +       if (err < 0) {
> +               p_err("interface %s detach failed: %s",
> +                     attach_type_strings[attach_type], strerror(errno));
> +               return err;
> +       }

Similar to previous patch, here we should use "strerror(-err)".
With this fixed, you can add my ack:
Acked-by: Yonghong Song <yhs@...com>

> +
> +       if (json_output)
> +               jsonw_null(json_wtr);
> +
> +       return 0;
> +}
> +
[...]