[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 n;

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

	while (fgets(buff, sizeof(buff), fp)) {
		n = sscanf(buff, "%u-%u", &start, &end);
		if (n == 0) {
			printf("Failed to retrieve # possible CPUs!\n");
			exit(1);
		} else if (n == 1) {
			end = start;
		}
		possible_cpus = start == 0 ? end + 1 : 0;
		break;
	}
	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

#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;
56a268cd	16	int n;
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
	24	while (fgets(buff, sizeof(buff), fp)) {
56a268cd TM	25	n = sscanf(buff, "%u-%u", &start, &end);
	26	if (n == 0) {
	27	printf("Failed to retrieve # possible CPUs!\n");
	28	exit(1);
	29	} else if (n == 1) {
	30	end = start;
e00c7b21	31	}
56a268cd TM	32	possible_cpus = start == 0 ? end + 1 : 0;
56a268cd TM	33	break;
e00c7b21	34	}
e00c7b21	35	fclose(fp);
e00c7b21 DB	36
	37	return possible_cpus;
	38	}
	39
f3515b5d DB	40	#define __bpf_percpu_val_align __attribute__((__aligned__(8)))
	41
	42	#define BPF_DECLARE_PERCPU(type, name) \
	43	struct { type v; /* padding */ } __bpf_percpu_val_align \
	44	name[bpf_num_possible_cpus()]
	45	#define bpf_percpu(name, cpu) name[(cpu)].v
	46
e00c7b21	47	#endif /* __BPF_UTIL__ */