summaryrefslogtreecommitdiffstats
path: root/tools/lib/bpf/bpf_helpers.h
blob: e9a4ecddb7a52400a6502957263509637b3cada2 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
/* SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause) */
#ifndef __BPF_HELPERS__
#define __BPF_HELPERS__

/*
 * Note that bpf programs need to include either
 * vmlinux.h (auto-generated from BTF) or linux/types.h
 * in advance since bpf_helper_defs.h uses such types
 * as __u64.
 */
#include "bpf_helper_defs.h"

#define __uint(name, val) int (*name)[val]
#define __type(name, val) typeof(val) *name
#define __array(name, val) typeof(val) *name[]

/* Helper macro to print out debug messages */
#define bpf_printk(fmt, ...)				\
({							\
	char ____fmt[] = fmt;				\
	bpf_trace_printk(____fmt, sizeof(____fmt),	\
			 ##__VA_ARGS__);		\
})

/*
 * Helper macro to place programs, maps, license in
 * different sections in elf_bpf file. Section names
 * are interpreted by elf_bpf loader
 */
#define SEC(NAME) __attribute__((section(NAME), used))

#ifndef __always_inline
#define __always_inline __attribute__((always_inline))
#endif
#ifndef __weak
#define __weak __attribute__((weak))
#endif

/*
 * Helper macro to manipulate data structures
 */
#ifndef offsetof
#define offsetof(TYPE, MEMBER)	((unsigned long)&((TYPE *)0)->MEMBER)
#endif
#ifndef container_of
#define container_of(ptr, type, member)				\
	({							\
		void *__mptr = (void *)(ptr);			\
		((type *)(__mptr - offsetof(type, member)));	\
	})
#endif

/*
 * Helper structure used by eBPF C program
 * to describe BPF map attributes to libbpf loader
 */
struct bpf_map_def {
	unsigned int type;
	unsigned int key_size;
	unsigned int value_size;
	unsigned int max_entries;
	unsigned int map_flags;
};

enum libbpf_pin_type {
	LIBBPF_PIN_NONE,
	/* PIN_BY_NAME: pin maps by name (in /sys/fs/bpf by default) */
	LIBBPF_PIN_BY_NAME,
};

enum libbpf_tristate {
	TRI_NO = 0,
	TRI_YES = 1,
	TRI_MODULE = 2,
};

#define __kconfig __attribute__((section(".kconfig")))
#define __ksym __attribute__((section(".ksyms")))

#endif