tools/bpf: sync uapi bpf.h for bpf_get_current_cgroup_id() helper

Sync kernel uapi/linux/bpf.h with tools uapi/linux/bpf.h.
Also add the necessary helper define in bpf_helpers.h.
Acked-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: Yonghong Song <yhs@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>

tools/include/uapi/linux/bpf.h

@@ -2070,6 +2070,11 @@ union bpf_attr {
  * 		**CONFIG_SOCK_CGROUP_DATA** configuration option.
  * 	Return
  * 		The id is returned or 0 in case the id could not be retrieved.
+ *
+ * u64 bpf_get_current_cgroup_id(void)
+ * 	Return
+ * 		A 64-bit integer containing the current cgroup id based
+ * 		on the cgroup within which the current task is running.
  */
 #define __BPF_FUNC_MAPPER(FN)		\
 	FN(unspec),			\
@@ -2151,7 +2156,8 @@ union bpf_attr {
 	FN(lwt_seg6_action),		\
 	FN(rc_repeat),			\
 	FN(rc_keydown),			\
-	FN(skb_cgroup_id),
+	FN(skb_cgroup_id),		\
+	FN(get_current_cgroup_id),
 
 /* integer value in 'imm' field of BPF_CALL instruction selects which helper
  * function eBPF program intends to call

tools/testing/selftests/bpf/bpf_helpers.h

@@ -131,6 +131,8 @@ static int (*bpf_rc_repeat)(void *ctx) =
 static int (*bpf_rc_keydown)(void *ctx, unsigned int protocol,
 			     unsigned long long scancode, unsigned int toggle) =
 	(void *) BPF_FUNC_rc_keydown;
+static unsigned long long (*bpf_get_current_cgroup_id)(void) =
+	(void *) BPF_FUNC_get_current_cgroup_id;
 
 /* llvm builtin functions that eBPF C program may use to
  * emit BPF_LD_ABS and BPF_LD_IND instructions