From ad954cbe084935b42e50d665fcbf2f8ac1df8c7e Mon Sep 17 00:00:00 2001 From: Tao Chen Date: Sat, 7 Jun 2025 00:58:16 +0800 Subject: [PATCH] bpftool: Display cookie for tracing link probe Display cookie for tracing link probe, in plain mode: #bpftool link 5: tracing prog 34 prog_type tracing attach_type trace_fentry target_obj_id 1 target_btf_id 60355 cookie 4503599627370496 pids test_progs(176) And in json mode: #bpftool link -j | jq { "id": 5, "type": "tracing", "prog_id": 34, "prog_type": "tracing", "attach_type": "trace_fentry", "target_obj_id": 1, "target_btf_id": 60355, "cookie": 4503599627370496, "pids": [ { "pid": 176, "comm": "test_progs" } ] } Signed-off-by: Tao Chen Signed-off-by: Andrii Nakryiko Link: https://lore.kernel.org/bpf/20250606165818.3394397-3-chen.dylane@linux.dev --- tools/bpf/bpftool/link.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/tools/bpf/bpftool/link.c b/tools/bpf/bpftool/link.c index cb67ce4eba241..03513ffffb79b 100644 --- a/tools/bpf/bpftool/link.c +++ b/tools/bpf/bpftool/link.c @@ -503,6 +503,7 @@ static int show_link_close_json(int fd, struct bpf_link_info *info) json_wtr); jsonw_uint_field(json_wtr, "target_obj_id", info->tracing.target_obj_id); jsonw_uint_field(json_wtr, "target_btf_id", info->tracing.target_btf_id); + jsonw_uint_field(json_wtr, "cookie", info->tracing.cookie); break; case BPF_LINK_TYPE_CGROUP: jsonw_lluint_field(json_wtr, "cgroup_id", @@ -900,6 +901,8 @@ static int show_link_close_plain(int fd, struct bpf_link_info *info) printf("\n\ttarget_obj_id %u target_btf_id %u ", info->tracing.target_obj_id, info->tracing.target_btf_id); + if (info->tracing.cookie) + printf("\n\tcookie %llu ", info->tracing.cookie); break; case BPF_LINK_TYPE_CGROUP: printf("\n\tcgroup_id %zu ", (size_t)info->cgroup.cgroup_id); -- 2.47.2