[linux-2.6-block.git] / tools / testing / selftests / bpf / bpf_util.h

/* SPDX-License-Identifier: GPL-2.0 */
#ifndef __BPF_UTIL__
#define __BPF_UTIL__

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>

static inline unsigned int bpf_num_possible_cpus(void)
{
	static const char *fcpu = "/sys/devices/system/cpu/possible";
	unsigned int start, end, possible_cpus = 0;
	char buff[128];
	FILE *fp;
	int len, n, i, j = 0;

	fp = fopen(fcpu, "r");
	if (!fp) {
		printf("Failed to open %s: '%s'!\n", fcpu, strerror(errno));
		exit(1);
	}

	if (!fgets(buff, sizeof(buff), fp)) {
		printf("Failed to read %s!\n", fcpu);
		exit(1);
	}

	len = strlen(buff);
	for (i = 0; i <= len; i++) {
		if (buff[i] == ',' || buff[i] == '\0') {
			buff[i] = '\0';
			n = sscanf(&buff[j], "%u-%u", &start, &end);
			if (n <= 0) {
				printf("Failed to retrieve # possible CPUs!\n");
				exit(1);
			} else if (n == 1) {
				end = start;
			}
			possible_cpus += end - start + 1;
			j = i + 1;
		}
	}

	fclose(fp);

	return possible_cpus;
}

#define __bpf_percpu_val_align	__attribute__((__aligned__(8)))

#define BPF_DECLARE_PERCPU(type, name)				\
	struct { type v; /* padding */ } __bpf_percpu_val_align	\
		name[bpf_num_possible_cpus()]
#define bpf_percpu(name, cpu) name[(cpu)].v

#ifndef ARRAY_SIZE
# define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0]))
#endif

#endif /* __BPF_UTIL__ */
Commit	Line	Data
b2441318	1	/* SPDX-License-Identifier: GPL-2.0 */
e00c7b21 DB	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;
1bb54c40	16	int len, n, i, j = 0;
e00c7b21 DB	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
1bb54c40 MP	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;
e00c7b21 DB	42	}
e00c7b21 DB	43	}
1bb54c40	44
e00c7b21	45	fclose(fp);
e00c7b21 DB	46
	47	return possible_cpus;
	48	}
	49
f3515b5d DB	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
aa5f0c96 MKL	57	#ifndef ARRAY_SIZE
	58	# define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0]))
	59	#endif
	60
e00c7b21	61	#endif /* __BPF_UTIL__ */