1 /* SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause) */ 2 #ifndef __BPF_HELPERS__ 3 #define __BPF_HELPERS__ 4 5 /* 6 * Note that bpf programs need to include either 7 * vmlinux.h (auto-generated from BTF) or linux/types.h 8 * in advance since bpf_helper_defs.h uses such types 9 * as __u64. 10 */ 11 #include "bpf_helper_defs.h" 12 13 #define __uint(name, val) int (*name)[val] 14 #define __type(name, val) typeof(val) *name 15 #define __array(name, val) typeof(val) *name[] 16 17 /* Helper macro to print out debug messages */ 18 #define bpf_printk(fmt, ...) \ 19 ({ \ 20 char ____fmt[] = fmt; \ 21 bpf_trace_printk(____fmt, sizeof(____fmt), \ 22 ##__VA_ARGS__); \ 23 }) 24 25 /* 26 * Helper macro to place programs, maps, license in 27 * different sections in elf_bpf file. Section names 28 * are interpreted by elf_bpf loader 29 */ 30 #define SEC(NAME) __attribute__((section(NAME), used)) 31 32 #ifndef __always_inline 33 #define __always_inline __attribute__((always_inline)) 34 #endif 35 #ifndef __noinline 36 #define __noinline __attribute__((noinline)) 37 #endif 38 #ifndef __weak 39 #define __weak __attribute__((weak)) 40 #endif 41 42 /* 43 * Helper macro to manipulate data structures 44 */ 45 #ifndef offsetof 46 #define offsetof(TYPE, MEMBER) ((unsigned long)&((TYPE *)0)->MEMBER) 47 #endif 48 #ifndef container_of 49 #define container_of(ptr, type, member) \ 50 ({ \ 51 void *__mptr = (void *)(ptr); \ 52 ((type *)(__mptr - offsetof(type, member))); \ 53 }) 54 #endif 55 56 /* 57 * Helper structure used by eBPF C program 58 * to describe BPF map attributes to libbpf loader 59 */ 60 struct bpf_map_def { 61 unsigned int type; 62 unsigned int key_size; 63 unsigned int value_size; 64 unsigned int max_entries; 65 unsigned int map_flags; 66 }; 67 68 enum libbpf_pin_type { 69 LIBBPF_PIN_NONE, 70 /* PIN_BY_NAME: pin maps by name (in /sys/fs/bpf by default) */ 71 LIBBPF_PIN_BY_NAME, 72 }; 73 74 enum libbpf_tristate { 75 TRI_NO = 0, 76 TRI_YES = 1, 77 TRI_MODULE = 2, 78 }; 79 80 #define __kconfig __attribute__((section(".kconfig"))) 81 #define __ksym __attribute__((section(".ksyms"))) 82 83 #endif 84