bpf: Add cookie to tracing bpf_link_info

bpf_tramp_link includes cookie info, we can add it in bpf_link_info.

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

Author: Tao Chen

include/uapi/linux/bpf.h

@@ -6665,6 +6665,8 @@ struct bpf_link_info {
 			__u32 attach_type;
 			__u32 target_obj_id; /* prog_id for PROG_EXT, otherwise btf object id */
 			__u32 target_btf_id; /* BTF type id inside the object */
+			__u32 :32;
+			__u64 cookie;
 		} tracing;
 		struct {
 			__u64 cgroup_id;

kernel/bpf/syscall.c

@@ -3416,6 +3416,7 @@ static int bpf_tracing_link_fill_link_info(const struct bpf_link *link,
 		container_of(link, struct bpf_tracing_link, link.link);
 
 	info->tracing.attach_type = tr_link->attach_type;
+	info->tracing.cookie = tr_link->link.cookie;
 	bpf_trampoline_unpack_key(tr_link->trampoline->key,
 				  &info->tracing.target_obj_id,
 				  &info->tracing.target_btf_id);

tools/include/uapi/linux/bpf.h

@@ -6665,6 +6665,8 @@ struct bpf_link_info {
 			__u32 attach_type;
 			__u32 target_obj_id; /* prog_id for PROG_EXT, otherwise btf object id */
 			__u32 target_btf_id; /* BTF type id inside the object */
+			__u32 :32;
+			__u64 cookie;
 		} tracing;
 		struct {
 			__u64 cgroup_id;