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