@@ -3415,6 +3415,20 @@ union bpf_attr {
* A non-negative value equal to or less than *size* on success,
* or a negative error in case of failure.
*
+ * void *bpf_per_cpu_ptr(const void *ptr, u32 cpu)
+ * Description
+ * Take the address of a percpu ksym and return a pointer pointing
+ * to the variable on *cpu*. A ksym is an extern variable decorated
+ * with '__ksym'. A ksym is percpu if there is a global percpu var
+ * (either static or global) defined of the same name in the kernel.
+ *
+ * bpf_per_cpu_ptr() has the same semantic as per_cpu_ptr() in the
+ * kernel, except that bpf_per_cpu_ptr() may return NULL. This
+ * happens if *cpu* is larger than nr_cpu_ids. The caller of
+ * bpf_per_cpu_ptr() must check the returned value.
+ * Return
+ * A generic pointer pointing to the variable on *cpu*.
+ *
*/
#define __BPF_FUNC_MAPPER(FN) \
FN(unspec), \
@@ -3559,6 +3573,7 @@ union bpf_attr {
FN(skc_to_tcp_request_sock), \
FN(skc_to_udp6_sock), \
FN(get_task_stack), \
+ FN(bpf_per_cpu_ptr), \
/* */
/* integer value in 'imm' field of BPF_CALL instruction selects which helper
Sync tools/include/linux/uapi/bpf.h with include/linux/uapi/bpf.h Signed-off-by: Hao Luo <haoluo@google.com> --- tools/include/uapi/linux/bpf.h | 15 +++++++++++++++ 1 file changed, 15 insertions(+)