[RFC PATCH bpf-next 4/5] bpftool: Add link dump support for BPF_LINK_TYPE_SK_MSG

[Yonghong Song <yonghong.song@xxxxxxxxx>]

An example output looks like:
  9: sk_msg  prog 108
          map_id 84  attach_type sk_msg_verdict

Signed-off-by: Yonghong Song <yonghong.song@xxxxxxxxx>
---
 tools/bpf/bpftool/link.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/tools/bpf/bpftool/link.c b/tools/bpf/bpftool/link.c
index afde9d0c2ea1..5eb140197d3f 100644
--- a/tools/bpf/bpftool/link.c
+++ b/tools/bpf/bpftool/link.c
@@ -526,6 +526,9 @@ static int show_link_close_json(int fd, struct bpf_link_info *info)
 		show_link_ifindex_json(info->netkit.ifindex, json_wtr);
 		show_link_attach_type_json(info->netkit.attach_type, json_wtr);
 		break;
+	case BPF_LINK_TYPE_SK_MSG:
+		jsonw_uint_field(json_wtr, "map_id", info->skmsg.map_id);
+		show_link_attach_type_json(info->skmsg.attach_type, json_wtr);
 	case BPF_LINK_TYPE_XDP:
 		show_link_ifindex_json(info->xdp.ifindex, json_wtr);
 		break;
@@ -915,6 +918,11 @@ static int show_link_close_plain(int fd, struct bpf_link_info *info)
 		show_link_ifindex_plain(info->netkit.ifindex);
 		show_link_attach_type_plain(info->netkit.attach_type);
 		break;
+	case BPF_LINK_TYPE_SK_MSG:
+		printf("\n\t");
+		printf("map_id %u  ", info->skmsg.map_id);
+		show_link_attach_type_plain(info->skmsg.attach_type);
+		break;
 	case BPF_LINK_TYPE_XDP:
 		printf("\n\t");
 		show_link_ifindex_plain(info->xdp.ifindex);
-- 
2.43.0