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 <bpf/libbpf.h> /* libbpf_num_possible_cpus */
10
11static 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__ */

 
 1#ifndef __BPF_UTIL__
 2#define __BPF_UTIL__
 3
 4#include <stdio.h>
 5#include <stdlib.h>
 6#include <string.h>
 7#include <errno.h>
 
 8
 9static inline unsigned int bpf_num_possible_cpus(void)
10{
11	static const char *fcpu = "/sys/devices/system/cpu/possible";
12	unsigned int start, end, possible_cpus = 0;
13	char buff[128];
14	FILE *fp;
15
16	fp = fopen(fcpu, "r");
17	if (!fp) {
18		printf("Failed to open %s: '%s'!\n", fcpu, strerror(errno));
19		exit(1);
20	}
21
22	while (fgets(buff, sizeof(buff), fp)) {
23		if (sscanf(buff, "%u-%u", &start, &end) == 2) {
24			possible_cpus = start == 0 ? end + 1 : 0;
25			break;
26		}
27	}
28
29	fclose(fp);
30	if (!possible_cpus) {
31		printf("Failed to retrieve # possible CPUs!\n");
32		exit(1);
33	}
34
35	return possible_cpus;
36}
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
37
38#endif /* __BPF_UTIL__ */