samples/bpf/xdp_sample_user.h

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 #ifndef XDP_SAMPLE_USER_H
   3 #define XDP_SAMPLE_USER_H
   4
   5 #include <bpf/libbpf.h>
   6 #include <linux/compiler.h>
   7
   8 #include "xdp_sample_shared.h"
   9
  10 enum stats_mask {
  11         _SAMPLE_REDIRECT_MAP         = 1U << 0,
  12         SAMPLE_RX_CNT                = 1U << 1,
  13         SAMPLE_REDIRECT_ERR_CNT      = 1U << 2,
  14         SAMPLE_CPUMAP_ENQUEUE_CNT    = 1U << 3,
  15         SAMPLE_CPUMAP_KTHREAD_CNT    = 1U << 4,
  16         SAMPLE_EXCEPTION_CNT         = 1U << 5,
  17         SAMPLE_DEVMAP_XMIT_CNT       = 1U << 6,
  18         SAMPLE_REDIRECT_CNT          = 1U << 7,
  19         SAMPLE_REDIRECT_MAP_CNT      = SAMPLE_REDIRECT_CNT | _SAMPLE_REDIRECT_MAP,
  20         SAMPLE_REDIRECT_ERR_MAP_CNT  = SAMPLE_REDIRECT_ERR_CNT | _SAMPLE_REDIRECT_MAP,
  21         SAMPLE_DEVMAP_XMIT_CNT_MULTI = 1U << 8,
  22         SAMPLE_SKIP_HEADING          = 1U << 9,
  23 };
  24
  25 /* Exit return codes */
  26 #define EXIT_OK                 0
  27 #define EXIT_FAIL               1
  28 #define EXIT_FAIL_OPTION        2
  29 #define EXIT_FAIL_XDP           3
  30 #define EXIT_FAIL_BPF           4
  31 #define EXIT_FAIL_MEM           5
  32
  33 int sample_setup_maps(struct bpf_map **maps);
  34 int __sample_init(int mask);
  35 void sample_exit(int status);
  36 int sample_run(int interval, void (*post_cb)(void *), void *ctx);
  37
  38 void sample_switch_mode(void);
  39 int sample_install_xdp(struct bpf_program *xdp_prog, int ifindex, bool generic,
  40                        bool force);
  41 void sample_usage(char *argv[], const struct option *long_options,
  42                   const char *doc, int mask, bool error);
  43
  44 const char *get_driver_name(int ifindex);
  45 int get_mac_addr(int ifindex, void *mac_addr);
  46
  47 #pragma GCC diagnostic push
  48 #pragma GCC diagnostic ignored "-Wstringop-truncation"
  49 __attribute__((unused))
  50 static inline char *safe_strncpy(char *dst, const char *src, size_t size)
  51 {
  52         if (!size)
  53                 return dst;
  54         strncpy(dst, src, size - 1);
  55         dst[size - 1] = '\0';
  56         return dst;
  57 }
  58 #pragma GCC diagnostic pop
  59
  60 #define __attach_tp(name)                                                      \
  61         ({                                                                     \
  62                 if (!bpf_program__is_tracing(skel->progs.name))                \
  63                         return -EINVAL;                                        \
  64                 skel->links.name = bpf_program__attach(skel->progs.name);      \
  65                 if (!skel->links.name)                                         \
  66                         return -errno;                                         \
  67         })
  68
  69 #define sample_init_pre_load(skel)                                             \
  70         ({                                                                     \
  71                 skel->rodata->nr_cpus = libbpf_num_possible_cpus();            \
  72                 sample_setup_maps((struct bpf_map *[]){                        \
  73                         skel->maps.rx_cnt, skel->maps.redir_err_cnt,           \
  74                         skel->maps.cpumap_enqueue_cnt,                         \
  75                         skel->maps.cpumap_kthread_cnt,                         \
  76                         skel->maps.exception_cnt, skel->maps.devmap_xmit_cnt,  \
  77                         skel->maps.devmap_xmit_cnt_multi });                   \
  78         })
  79
  80 #define DEFINE_SAMPLE_INIT(name)                                               \
  81         static int sample_init(struct name *skel, int mask)                    \
  82         {                                                                      \
  83                 int ret;                                                       \
  84                 ret = __sample_init(mask);                                     \
  85                 if (ret < 0)                                                   \
  86                         return ret;                                            \
  87                 if (mask & SAMPLE_REDIRECT_MAP_CNT)                            \
  88                         __attach_tp(tp_xdp_redirect_map);                      \
  89                 if (mask & SAMPLE_REDIRECT_CNT)                                \
  90                         __attach_tp(tp_xdp_redirect);                          \
  91                 if (mask & SAMPLE_REDIRECT_ERR_MAP_CNT)                        \
  92                         __attach_tp(tp_xdp_redirect_map_err);                  \
  93                 if (mask & SAMPLE_REDIRECT_ERR_CNT)                            \
  94                         __attach_tp(tp_xdp_redirect_err);                      \
  95                 if (mask & SAMPLE_CPUMAP_ENQUEUE_CNT)                          \
  96                         __attach_tp(tp_xdp_cpumap_enqueue);                    \
  97                 if (mask & SAMPLE_CPUMAP_KTHREAD_CNT)                          \
  98                         __attach_tp(tp_xdp_cpumap_kthread);                    \
  99                 if (mask & SAMPLE_EXCEPTION_CNT)                               \
 100                         __attach_tp(tp_xdp_exception);                         \
 101                 if (mask & SAMPLE_DEVMAP_XMIT_CNT)                             \
 102                         __attach_tp(tp_xdp_devmap_xmit);                       \
 103                 if (mask & SAMPLE_DEVMAP_XMIT_CNT_MULTI)                       \
 104                         __attach_tp(tp_xdp_devmap_xmit_multi);                 \
 105                 return 0;                                                      \
 106         }
 107
 108 #endif