mirror of
https://github.com/torvalds/linux.git
synced 2024-12-04 01:51:34 +00:00
5fbc220862
These two helpers will be used later in bpf_iter bpf program bpf_iter_netlink.c. Put them in bpf_helpers.h since they could be useful in other cases. Signed-off-by: Yonghong Song <yhs@fb.com> Signed-off-by: Alexei Starovoitov <ast@kernel.org> Acked-by: Andrii Nakryiko <andriin@fb.com> Link: https://lore.kernel.org/bpf/20200509175919.2477104-1-yhs@fb.com
80 lines
1.8 KiB
C
80 lines
1.8 KiB
C
/* 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) ((size_t)&((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")))
|
|
|
|
#endif
|