1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef __BPF_UTIL__
3 #define __BPF_UTIL__
4 
5 #include <stdio.h>
6 #include <stdlib.h>
7 #include <string.h>
8 #include <errno.h>
9 #include <libbpf.h> /* libbpf_num_possible_cpus */
10 
11 static inline unsigned int bpf_num_possible_cpus(void)
12 {
13 	int possible_cpus = libbpf_num_possible_cpus();
14 
15 	if (possible_cpus < 0) {
16 		printf("Failed to get # of possible cpus: '%s'!\n",
17 		       strerror(-possible_cpus));
18 		exit(1);
19 	}
20 	return possible_cpus;
21 }
22 
23 #define __bpf_percpu_val_align	__attribute__((__aligned__(8)))
24 
25 #define BPF_DECLARE_PERCPU(type, name)				\
26 	struct { type v; /* padding */ } __bpf_percpu_val_align	\
27 		name[bpf_num_possible_cpus()]
28 #define bpf_percpu(name, cpu) name[(cpu)].v
29 
30 #ifndef ARRAY_SIZE
31 # define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0]))
32 #endif
33 
34 #ifndef sizeof_field
35 #define sizeof_field(TYPE, MEMBER) sizeof((((TYPE *)0)->MEMBER))
36 #endif
37 
38 #ifndef offsetofend
39 #define offsetofend(TYPE, MEMBER) \
40 	(offsetof(TYPE, MEMBER)	+ sizeof_field(TYPE, MEMBER))
41 #endif
42 
43 #endif /* __BPF_UTIL__ */
44