mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-12-27 13:05:03 +08:00
e3ed2fef22
This patch introduces bpf.c and bpf.h, which hold common functions issuing bpf syscall. The goal of these two files is to hide syscall completely from user. Note that bpf.c and bpf.h deal with kernel interface only. Things like structure of 'map' section in the ELF object is not cared by of bpf.[ch]. We first introduce bpf_create_map(). Note that, since functions in bpf.[ch] are wrapper of sys_bpf, they don't use OO style naming. Signed-off-by: Wang Nan <wangnan0@huawei.com> Acked-by: Alexei Starovoitov <ast@plumgrid.com> Cc: Brendan Gregg <brendan.d.gregg@gmail.com> Cc: Daniel Borkmann <daniel@iogearbox.net> Cc: David Ahern <dsahern@gmail.com> Cc: He Kuang <hekuang@huawei.com> Cc: Jiri Olsa <jolsa@kernel.org> Cc: Kaixu Xia <xiakaixu@huawei.com> Cc: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Zefan Li <lizefan@huawei.com> Cc: pi3orama@163.com Link: http://lkml.kernel.org/r/1435716878-189507-16-git-send-email-wangnan0@huawei.com Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
52 lines
1.1 KiB
C
52 lines
1.1 KiB
C
/*
|
|
* common eBPF ELF operations.
|
|
*
|
|
* Copyright (C) 2013-2015 Alexei Starovoitov <ast@kernel.org>
|
|
* Copyright (C) 2015 Wang Nan <wangnan0@huawei.com>
|
|
* Copyright (C) 2015 Huawei Inc.
|
|
*/
|
|
|
|
#include <stdlib.h>
|
|
#include <memory.h>
|
|
#include <unistd.h>
|
|
#include <asm/unistd.h>
|
|
#include <linux/bpf.h>
|
|
#include "bpf.h"
|
|
|
|
/*
|
|
* When building perf, unistd.h is override. Define __NR_bpf is
|
|
* required to be defined.
|
|
*/
|
|
#ifndef __NR_bpf
|
|
# if defined(__i386__)
|
|
# define __NR_bpf 357
|
|
# elif defined(__x86_64__)
|
|
# define __NR_bpf 321
|
|
# elif defined(__aarch64__)
|
|
# define __NR_bpf 280
|
|
# else
|
|
# error __NR_bpf not defined. libbpf does not support your arch.
|
|
# endif
|
|
#endif
|
|
|
|
static int sys_bpf(enum bpf_cmd cmd, union bpf_attr *attr,
|
|
unsigned int size)
|
|
{
|
|
return syscall(__NR_bpf, cmd, attr, size);
|
|
}
|
|
|
|
int bpf_create_map(enum bpf_map_type map_type, int key_size,
|
|
int value_size, int max_entries)
|
|
{
|
|
union bpf_attr attr;
|
|
|
|
memset(&attr, '\0', sizeof(attr));
|
|
|
|
attr.map_type = map_type;
|
|
attr.key_size = key_size;
|
|
attr.value_size = value_size;
|
|
attr.max_entries = max_entries;
|
|
|
|
return sys_bpf(BPF_MAP_CREATE, &attr, sizeof(attr));
|
|
}
|