tools/lib/bpf/bpf_helpers.h

   1 /* SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause) */
   2 #ifndef __BPF_HELPERS__
   3 #define __BPF_HELPERS__
   4
   5 #include "bpf_helper_defs.h"
   6
   7 #define __uint(name, val) int (*name)[val]
   8 #define __type(name, val) typeof(val) *name
   9
  10 /* Helper macro to print out debug messages */
  11 #define bpf_printk(fmt, ...)                            \
  12 ({                                                      \
  13         char ____fmt[] = fmt;                           \
  14         bpf_trace_printk(____fmt, sizeof(____fmt),      \
  15                          ##__VA_ARGS__);                \
  16 })
  17
  18 /*
  19  * Helper macro to place programs, maps, license in
  20  * different sections in elf_bpf file. Section names
  21  * are interpreted by elf_bpf loader
  22  */
  23 #define SEC(NAME) __attribute__((section(NAME), used))
  24
  25 #ifndef __always_inline
  26 #define __always_inline __attribute__((always_inline))
  27 #endif
  28 #ifndef __weak
  29 #define __weak __attribute__((weak))
  30 #endif
  31
  32 /*
  33  * Helper structure used by eBPF C program
  34  * to describe BPF map attributes to libbpf loader
  35  */
  36 struct bpf_map_def {
  37         unsigned int type;
  38         unsigned int key_size;
  39         unsigned int value_size;
  40         unsigned int max_entries;
  41         unsigned int map_flags;
  42 };
  43
  44 enum libbpf_pin_type {
  45         LIBBPF_PIN_NONE,
  46         /* PIN_BY_NAME: pin maps by name (in /sys/fs/bpf by default) */
  47         LIBBPF_PIN_BY_NAME,
  48 };
  49
  50 enum libbpf_tristate {
  51         TRI_NO = 0,
  52         TRI_YES = 1,
  53         TRI_MODULE = 2,
  54 };
  55
  56 #define __kconfig __attribute__((section(".kconfig")))
  57
  58 #endif