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 
10 static inline unsigned int bpf_num_possible_cpus(void)
11 {
12 	static const char *fcpu = "/sys/devices/system/cpu/possible";
13 	unsigned int start, end, possible_cpus = 0;
14 	char buff[128];
15 	FILE *fp;
16 	int len, n, i, j = 0;
17 
18 	fp = fopen(fcpu, "r");
19 	if (!fp) {
20 		printf("Failed to open %s: '%s'!\n", fcpu, strerror(errno));
21 		exit(1);
22 	}
23 
24 	if (!fgets(buff, sizeof(buff), fp)) {
25 		printf("Failed to read %s!\n", fcpu);
26 		exit(1);
27 	}
28 
29 	len = strlen(buff);
30 	for (i = 0; i <= len; i++) {
31 		if (buff[i] == ',' || buff[i] == '\0') {
32 			buff[i] = '\0';
33 			n = sscanf(&buff[j], "%u-%u", &start, &end);
34 			if (n <= 0) {
35 				printf("Failed to retrieve # possible CPUs!\n");
36 				exit(1);
37 			} else if (n == 1) {
38 				end = start;
39 			}
40 			possible_cpus += end - start + 1;
41 			j = i + 1;
42 		}
43 	}
44 
45 	fclose(fp);
46 
47 	return possible_cpus;
48 }
49 
50 #define __bpf_percpu_val_align	__attribute__((__aligned__(8)))
51 
52 #define BPF_DECLARE_PERCPU(type, name)				\
53 	struct { type v; /* padding */ } __bpf_percpu_val_align	\
54 		name[bpf_num_possible_cpus()]
55 #define bpf_percpu(name, cpu) name[(cpu)].v
56 
57 #ifndef ARRAY_SIZE
58 # define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0]))
59 #endif
60 
61 #ifndef sizeof_field
62 #define sizeof_field(TYPE, MEMBER) sizeof((((TYPE *)0)->MEMBER))
63 #endif
64 
65 #ifndef offsetofend
66 #define offsetofend(TYPE, MEMBER) \
67 	(offsetof(TYPE, MEMBER)	+ sizeof_field(TYPE, MEMBER))
68 #endif
69 
70 #endif /* __BPF_UTIL__ */
71