Quelle  xdp_sample_user.h   Sprache: C

// SPDX-License-Identifier: GPL-2.0-only
#ifndef XDP_SAMPLE_USER_H
#define XDP_SAMPLE_USER_H

#include <bpf/libbpf.h>
#include <linux/compiler.h>

#include "xdp_sample_shared.h"

enum stats_mask {
 _SAMPLE_REDIRECT_MAP         = 1U << 0,
 SAMPLE_RX_CNT                = 1U << 1,
 SAMPLE_REDIRECT_ERR_CNT      = 1U << 2,
 SAMPLE_CPUMAP_ENQUEUE_CNT    = 1U << 3,
 SAMPLE_CPUMAP_KTHREAD_CNT    = 1U << 4,
 SAMPLE_EXCEPTION_CNT         = 1U << 5,
 SAMPLE_DEVMAP_XMIT_CNT       = 1U << 6,
 SAMPLE_REDIRECT_CNT          = 1U << 7,
 SAMPLE_REDIRECT_MAP_CNT      = SAMPLE_REDIRECT_CNT | _SAMPLE_REDIRECT_MAP,
 SAMPLE_REDIRECT_ERR_MAP_CNT  = SAMPLE_REDIRECT_ERR_CNT | _SAMPLE_REDIRECT_MAP,
 SAMPLE_DEVMAP_XMIT_CNT_MULTI = 1U << 8,
 SAMPLE_SKIP_HEADING      = 1U << 9,
};

/* Exit return codes */
#define EXIT_OK   0
#define EXIT_FAIL  1
#define EXIT_FAIL_OPTION 2
#define EXIT_FAIL_XDP  3
#define EXIT_FAIL_BPF  4
#define EXIT_FAIL_MEM  5

int sample_setup_maps(struct bpf_map **maps);
int __sample_init(int mask);
void sample_exit(int status);
int sample_run(int interval, void (*post_cb)(void *), void *ctx);

void sample_switch_mode(void);
int sample_install_xdp(struct bpf_program *xdp_prog, int ifindex, bool generic,
         bool force);
void sample_usage(char *argv[], const struct option *long_options,
    const char *doc, int mask, bool error);

const char *get_driver_name(int ifindex);
int get_mac_addr(int ifindex, void *mac_addr);

#pragma GCC diagnostic push
#ifndef __clang__
#pragma GCC diagnostic ignored "-Wstringop-truncation"
#endif
__attribute__((unused))
static inline char *safe_strncpy(char *dst, const char *src, size_t size)
{
 if (!size)
  return dst;
 strncpy(dst, src, size - 1);
 dst[size - 1] = '\0';
 return dst;
}
#pragma GCC diagnostic pop

#define __attach_tp(name)                                                      \
 ({                                                                     \
  if (bpf_program__type(skel->progs.name) != BPF_PROG_TYPE_TRACING)\
   return -EINVAL;                                        \
  skel->links.name = bpf_program__attach(skel->progs.name);      \
  if (!skel->links.name)                                         \
   return -errno;                                         \
 })

#define sample_init_pre_load(skel)                                             \
 ({                                                                     \
  skel->rodata->nr_cpus = libbpf_num_possible_cpus();            \
  sample_setup_maps((struct bpf_map *[]){                        \
   skel->maps.rx_cnt, skel->maps.redir_err_cnt,           \
   skel->maps.cpumap_enqueue_cnt,                         \
   skel->maps.cpumap_kthread_cnt,                         \
   skel->maps.exception_cnt, skel->maps.devmap_xmit_cnt,  \
   skel->maps.devmap_xmit_cnt_multi });                   \
 })

#define DEFINE_SAMPLE_INIT(name)                                               \
 static int sample_init(struct name *skel, int mask)                    \
 {                                                                      \
  int ret;                                                       \
  ret = __sample_init(mask);                                     \
  if (ret < 0)                                                   \
   return ret;                                            \
  if (mask & SAMPLE_REDIRECT_MAP_CNT)                            \
   __attach_tp(tp_xdp_redirect_map);                      \
  if (mask & SAMPLE_REDIRECT_CNT)                                \
   __attach_tp(tp_xdp_redirect);                          \
  if (mask & SAMPLE_REDIRECT_ERR_MAP_CNT)                        \
   __attach_tp(tp_xdp_redirect_map_err);                  \
  if (mask & SAMPLE_REDIRECT_ERR_CNT)                            \
   __attach_tp(tp_xdp_redirect_err);                      \
  if (mask & SAMPLE_CPUMAP_ENQUEUE_CNT)                          \
   __attach_tp(tp_xdp_cpumap_enqueue);                    \
  if (mask & SAMPLE_CPUMAP_KTHREAD_CNT)                          \
   __attach_tp(tp_xdp_cpumap_kthread);                    \
  if (mask & SAMPLE_EXCEPTION_CNT)                               \
   __attach_tp(tp_xdp_exception);                         \
  if (mask & SAMPLE_DEVMAP_XMIT_CNT)                             \
   __attach_tp(tp_xdp_devmap_xmit);                       \
  if (mask & SAMPLE_DEVMAP_XMIT_CNT_MULTI)                       \
   __attach_tp(tp_xdp_devmap_xmit_multi);                 \
  return 0;                                                      \
 }

#endif