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bpftool: Implement link show support for xdp

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Add support to dump XDP link information to bpftool. This reuses the
recently added show_link_ifindex_{plain,json}(). The XDP link info only
exposes the ifindex.

Below shows an example link dump output, and a cgroup link is included
for comparison, too:

  # bpftool link
  [...]
  10: cgroup  prog 2466
        cgroup_id 1  attach_type cgroup_inet6_post_bind
  [...]
  16: xdp  prog 2477
        ifindex enp5s0(3)
  [...]

Equivalent json output:

  # bpftool link --json
  [...]
  {
    "id": 10,
    "type": "cgroup",
    "prog_id": 2466,
    "cgroup_id": 1,
    "attach_type": "cgroup_inet6_post_bind"
  },
  [...]
  {
    "id": 16,
    "type": "xdp",
    "prog_id": 2477,
    "devname": "enp5s0",
    "ifindex": 3
  }
  [...]

Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Reviewed-by: Quentin Monnet <quentin@isovalent.com>
Link: https://lore.kernel.org/r/20230816095651.10014-2-daniel@iogearbox.net
Signed-off-by: Martin KaFai Lau <martin.lau@kernel.org>
This commit is contained in:
Daniel Borkmann 2023-08-16 11:56:51 +02:00 committed by Martin KaFai Lau
parent e16e6c6df4
commit 053bbf9bff
1 changed files with 7 additions and 0 deletions
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7
tools/bpf/bpftool/link.c
View File

@ -449,6 +449,9 @@ static int show_link_close_json(int fd, struct bpf_link_info *info)
show_link_ifindex_json(info->tcx.ifindex, json_wtr);
show_link_attach_type_json(info->tcx.attach_type, json_wtr);
break;
case BPF_LINK_TYPE_XDP:
show_link_ifindex_json(info->xdp.ifindex, json_wtr);
break;
case BPF_LINK_TYPE_STRUCT_OPS:
jsonw_uint_field(json_wtr, "map_id",
info->struct_ops.map_id);
@ -782,6 +785,10 @@ static int show_link_close_plain(int fd, struct bpf_link_info *info)
show_link_ifindex_plain(info->tcx.ifindex);
show_link_attach_type_plain(info->tcx.attach_type);
break;
case BPF_LINK_TYPE_XDP:
printf("\n\t");
show_link_ifindex_plain(info->xdp.ifindex);
break;
case BPF_LINK_TYPE_KPROBE_MULTI:
show_kprobe_multi_plain(info);
break;