include/bpf_elf.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef __BPF_ELF__
   3 #define __BPF_ELF__
   4
   5 #include <asm/types.h>
   6
   7 /* Note:
   8  *
   9  * Below ELF section names and bpf_elf_map structure definition
  10  * are not (!) kernel ABI. It's rather a "contract" between the
  11  * application and the BPF loader in tc. For compatibility, the
  12  * section names should stay as-is. Introduction of aliases, if
  13  * needed, are a possibility, though.
  14  */
  15
  16 /* ELF section names, etc */
  17 #define ELF_SECTION_LICENSE     "license"
  18 #define ELF_SECTION_MAPS        "maps"
  19 #define ELF_SECTION_PROG        "prog"
  20 #define ELF_SECTION_CLASSIFIER  "classifier"
  21 #define ELF_SECTION_ACTION      "action"
  22
  23 #define ELF_MAX_MAPS            64
  24 #define ELF_MAX_LICENSE_LEN     128
  25
  26 /* Object pinning settings */
  27 #define PIN_NONE                0
  28 #define PIN_OBJECT_NS           1
  29 #define PIN_GLOBAL_NS           2
  30
  31 /* ELF map definition */
  32 struct bpf_elf_map {
  33         __u32 type;
  34         __u32 size_key;
  35         __u32 size_value;
  36         __u32 max_elem;
  37         __u32 flags;
  38         __u32 id;
  39         __u32 pinning;
  40         __u32 inner_id;
  41         __u32 inner_idx;
  42 };
  43
  44 #define BPF_ANNOTATE_KV_PAIR(name, type_key, type_val)          \
  45         struct ____btf_map_##name {                             \
  46                 type_key key;                                   \
  47                 type_val value;                                 \
  48         };                                                      \
  49         struct ____btf_map_##name                               \
  50             __attribute__ ((section(".maps." #name), used))     \
  51             ____btf_map_##name = { }
  52
  53 #endif /* __BPF_ELF__ */