samples/bpf/bpf_load.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef __BPF_LOAD_H
   3 #define __BPF_LOAD_H
   4
   5 #include "libbpf.h"
   6
   7 #define MAX_MAPS 32
   8 #define MAX_PROGS 32
   9
  10 struct bpf_map_def {
  11         unsigned int type;
  12         unsigned int key_size;
  13         unsigned int value_size;
  14         unsigned int max_entries;
  15         unsigned int map_flags;
  16         unsigned int inner_map_idx;
  17         unsigned int numa_node;
  18 };
  19
  20 struct bpf_map_data {
  21         int fd;
  22         char *name;
  23         size_t elf_offset;
  24         struct bpf_map_def def;
  25 };
  26
  27 typedef void (*fixup_map_cb)(struct bpf_map_data *map, int idx);
  28
  29 extern int prog_fd[MAX_PROGS];
  30 extern int event_fd[MAX_PROGS];
  31 extern char bpf_log_buf[BPF_LOG_BUF_SIZE];
  32 extern int prog_cnt;
  33
  34 /* There is a one-to-one mapping between map_fd[] and map_data[].
  35  * The map_data[] just contains more rich info on the given map.
  36  */
  37 extern int map_fd[MAX_MAPS];
  38 extern struct bpf_map_data map_data[MAX_MAPS];
  39 extern int map_data_count;
  40
  41 /* parses elf file compiled by llvm .c->.o
  42  * . parses 'maps' section and creates maps via BPF syscall
  43  * . parses 'license' section and passes it to syscall
  44  * . parses elf relocations for BPF maps and adjusts BPF_LD_IMM64 insns by
  45  *   storing map_fd into insn->imm and marking such insns as BPF_PSEUDO_MAP_FD
  46  * . loads eBPF programs via BPF syscall
  47  *
  48  * One ELF file can contain multiple BPF programs which will be loaded
  49  * and their FDs stored stored in prog_fd array
  50  *
  51  * returns zero on success
  52  */
  53 int load_bpf_file(char *path);
  54 int load_bpf_file_fixup_map(const char *path, fixup_map_cb fixup_map);
  55
  56 void read_trace_pipe(void);
  57 struct ksym {
  58         long addr;
  59         char *name;
  60 };
  61
  62 int load_kallsyms(void);
  63 struct ksym *ksym_search(long key);
  64 int set_link_xdp_fd(int ifindex, int fd, __u32 flags);
  65 #endif