bpftool: Display cookie for raw_tp link probe

Display cookie for raw_tp link probe, in plain mode:

 #bpftool link

22: raw_tracepoint  prog 14
        tp 'sys_enter'  cookie 23925373020405760
        pids test_progs(176)

And in json mode:

 #bpftool link -j | jq

[
  {
    "id": 47,
    "type": "raw_tracepoint",
    "prog_id": 79,
    "tp_name": "sys_enter",
    "cookie": 23925373020405760,
    "pids": [
      {
        "pid": 274,
        "comm": "test_progs"
      }
    ]
  }
]

Signed-off-by: Tao Chen <[email protected]>
Signed-off-by: Andrii Nakryiko <[email protected]>
Acked-by: Quentin Monnet <[email protected]>
Link: https://lore.kernel.org/bpf/[email protected]

Author: Tao Chen

src/link.c

@@ -485,6 +485,7 @@ static int show_link_close_json(int fd, struct bpf_link_info *info)
 	case BPF_LINK_TYPE_RAW_TRACEPOINT:
 		jsonw_string_field(json_wtr, "tp_name",
 				   u64_to_ptr(info->raw_tracepoint.tp_name));
+		jsonw_uint_field(json_wtr, "cookie", info->raw_tracepoint.cookie);
 		break;
 	case BPF_LINK_TYPE_TRACING:
 		err = get_prog_info(info->prog_id, &prog_info);
@@ -879,6 +880,8 @@ static int show_link_close_plain(int fd, struct bpf_link_info *info)
 	case BPF_LINK_TYPE_RAW_TRACEPOINT:
 		printf("\n\ttp '%s'  ",
 		       (const char *)u64_to_ptr(info->raw_tracepoint.tp_name));
+		if (info->raw_tracepoint.cookie)
+			printf("cookie %llu  ", info->raw_tracepoint.cookie);
 		break;
 	case BPF_LINK_TYPE_TRACING:
 		err = get_prog_info(info->prog_id, &prog_info);