bpf: Add cookie in fdinfo for raw_tp

Add cookie in fdinfo for raw_tp, the info as follows:

link_type:	raw_tracepoint
link_id:	31
prog_tag:	9dfdf8ef453843bf
prog_id:	32
tp_name:	sys_enter
cookie:	23925373020405760

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

kernel/bpf/syscall.c

@@ -3654,8 +3654,10 @@ static void bpf_raw_tp_link_show_fdinfo(const struct bpf_link *link,
 		container_of(link, struct bpf_raw_tp_link, link);
 
 	seq_printf(seq,
-		   "tp_name:\t%s\n",
-		   raw_tp_link->btp->tp->name);
+		   "tp_name:\t%s\n"
+		   "cookie:\t%llu\n",
+		   raw_tp_link->btp->tp->name,
+		   raw_tp_link->cookie);
 }
 
 static int bpf_copy_to_user(char __user *ubuf, const char *buf, u32 ulen,