63 lines
1.6 KiB
C
63 lines
1.6 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
|
|
#ifndef __BPF_UTIL__
|
|
#define __BPF_UTIL__
|
|
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
#include <errno.h>
|
|
#include <bpf/libbpf.h> /* libbpf_num_possible_cpus */
|
|
|
|
static inline unsigned int bpf_num_possible_cpus(void)
|
|
{
|
|
int possible_cpus = libbpf_num_possible_cpus();
|
|
|
|
if (possible_cpus < 0) {
|
|
printf("Failed to get # of possible cpus: '%s'!\n",
|
|
strerror(-possible_cpus));
|
|
exit(1);
|
|
}
|
|
return possible_cpus;
|
|
}
|
|
|
|
/* Copy up to sz - 1 bytes from zero-terminated src string and ensure that dst
|
|
* is zero-terminated string no matter what (unless sz == 0, in which case
|
|
* it's a no-op). It's conceptually close to FreeBSD's strlcpy(), but differs
|
|
* in what is returned. Given this is internal helper, it's trivial to extend
|
|
* this, when necessary. Use this instead of strncpy inside libbpf source code.
|
|
*/
|
|
static inline void bpf_strlcpy(char *dst, const char *src, size_t sz)
|
|
{
|
|
size_t i;
|
|
|
|
if (sz == 0)
|
|
return;
|
|
|
|
sz--;
|
|
for (i = 0; i < sz && src[i]; i++)
|
|
dst[i] = src[i];
|
|
dst[i] = '\0';
|
|
}
|
|
|
|
#define __bpf_percpu_val_align __attribute__((__aligned__(8)))
|
|
|
|
#define BPF_DECLARE_PERCPU(type, name) \
|
|
struct { type v; /* padding */ } __bpf_percpu_val_align \
|
|
name[bpf_num_possible_cpus()]
|
|
#define bpf_percpu(name, cpu) name[(cpu)].v
|
|
|
|
#ifndef ARRAY_SIZE
|
|
# define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0]))
|
|
#endif
|
|
|
|
#ifndef sizeof_field
|
|
#define sizeof_field(TYPE, MEMBER) sizeof((((TYPE *)0)->MEMBER))
|
|
#endif
|
|
|
|
#ifndef offsetofend
|
|
#define offsetofend(TYPE, MEMBER) \
|
|
(offsetof(TYPE, MEMBER) + sizeof_field(TYPE, MEMBER))
|
|
#endif
|
|
|
|
#endif /* __BPF_UTIL__ */
|