tools/testing/selftests/bpf/bpf_util.h

   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 #include <libbpf.h> /* libbpf_num_possible_cpus */
  10
  11 static inline unsigned int bpf_num_possible_cpus(void)
  12 {
  13         int possible_cpus = libbpf_num_possible_cpus();
  14
  15         if (possible_cpus < 0) {
  16                 printf("Failed to get # of possible cpus: '%s'!\n",
  17                        strerror(-possible_cpus));
  18                 exit(1);
  19         }
  20         return possible_cpus;
  21 }
  22
  23 #define __bpf_percpu_val_align  __attribute__((__aligned__(8)))
  24
  25 #define BPF_DECLARE_PERCPU(type, name)                          \
  26         struct { type v; /* padding */ } __bpf_percpu_val_align \
  27                 name[bpf_num_possible_cpus()]
  28 #define bpf_percpu(name, cpu) name[(cpu)].v
  29
  30 #ifndef ARRAY_SIZE
  31 # define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0]))
  32 #endif
  33
  34 #ifndef sizeof_field
  35 #define sizeof_field(TYPE, MEMBER) sizeof((((TYPE *)0)->MEMBER))
  36 #endif
  37
  38 #ifndef offsetofend
  39 #define offsetofend(TYPE, MEMBER) \
  40         (offsetof(TYPE, MEMBER) + sizeof_field(TYPE, MEMBER))
  41 #endif
  42
  43 #endif /* __BPF_UTIL__ */