48 lines
1.0 KiB
C
48 lines
1.0 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef __BPF_UTIL__
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#define __BPF_UTIL__
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <errno.h>
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static inline unsigned int bpf_num_possible_cpus(void)
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{
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static const char *fcpu = "/sys/devices/system/cpu/possible";
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unsigned int start, end, possible_cpus = 0;
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char buff[128];
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FILE *fp;
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int n;
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fp = fopen(fcpu, "r");
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if (!fp) {
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printf("Failed to open %s: '%s'!\n", fcpu, strerror(errno));
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exit(1);
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}
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while (fgets(buff, sizeof(buff), fp)) {
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n = sscanf(buff, "%u-%u", &start, &end);
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if (n == 0) {
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printf("Failed to retrieve # possible CPUs!\n");
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exit(1);
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} else if (n == 1) {
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end = start;
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}
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possible_cpus = start == 0 ? end + 1 : 0;
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break;
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}
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fclose(fp);
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return possible_cpus;
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}
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#define __bpf_percpu_val_align __attribute__((__aligned__(8)))
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#define BPF_DECLARE_PERCPU(type, name) \
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struct { type v; /* padding */ } __bpf_percpu_val_align \
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name[bpf_num_possible_cpus()]
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#define bpf_percpu(name, cpu) name[(cpu)].v
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#endif /* __BPF_UTIL__ */
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