tools/lib/bpf/libbpf.h

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This source file includes following definitions.
prog_type
map_type
libbpf_num_possible_cpus
   1 /* SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause) */
   2 
   3 /*
   4  * Common eBPF ELF object loading operations.
   5  *
   6  * Copyright (C) 2013-2015 Alexei Starovoitov <ast@kernel.org>
   7  * Copyright (C) 2015 Wang Nan <wangnan0@huawei.com>
   8  * Copyright (C) 2015 Huawei Inc.
   9  */
  10 #ifndef __LIBBPF_LIBBPF_H
  11 #define __LIBBPF_LIBBPF_H
  12 
  13 #include <stdarg.h>
  14 #include <stdio.h>
  15 #include <stdint.h>
  16 #include <stdbool.h>
  17 #include <sys/types.h>  // for size_t
  18 #include <linux/bpf.h>
  19 
  20 #ifdef __cplusplus
  21 extern "C" {
  22 #endif
  23 
  24 #ifndef LIBBPF_API
  25 #define LIBBPF_API __attribute__((visibility("default")))
  26 #endif
  27 
  28 enum libbpf_errno {
  29         __LIBBPF_ERRNO__START = 4000,
  30 
  31         /* Something wrong in libelf */
  32         LIBBPF_ERRNO__LIBELF = __LIBBPF_ERRNO__START,
  33         LIBBPF_ERRNO__FORMAT,   /* BPF object format invalid */
  34         LIBBPF_ERRNO__KVERSION, /* Incorrect or no 'version' section */
  35         LIBBPF_ERRNO__ENDIAN,   /* Endian mismatch */
  36         LIBBPF_ERRNO__INTERNAL, /* Internal error in libbpf */
  37         LIBBPF_ERRNO__RELOC,    /* Relocation failed */
  38         LIBBPF_ERRNO__LOAD,     /* Load program failure for unknown reason */
  39         LIBBPF_ERRNO__VERIFY,   /* Kernel verifier blocks program loading */
  40         LIBBPF_ERRNO__PROG2BIG, /* Program too big */
  41         LIBBPF_ERRNO__KVER,     /* Incorrect kernel version */
  42         LIBBPF_ERRNO__PROGTYPE, /* Kernel doesn't support this program type */
  43         LIBBPF_ERRNO__WRNGPID,  /* Wrong pid in netlink message */
  44         LIBBPF_ERRNO__INVSEQ,   /* Invalid netlink sequence */
  45         LIBBPF_ERRNO__NLPARSE,  /* netlink parsing error */
  46         __LIBBPF_ERRNO__END,
  47 };
  48 
  49 LIBBPF_API int libbpf_strerror(int err, char *buf, size_t size);
  50 
  51 enum libbpf_print_level {
  52         LIBBPF_WARN,
  53         LIBBPF_INFO,
  54         LIBBPF_DEBUG,
  55 };
  56 
  57 typedef int (*libbpf_print_fn_t)(enum libbpf_print_level level,
  58                                  const char *, va_list ap);
  59 
  60 LIBBPF_API libbpf_print_fn_t libbpf_set_print(libbpf_print_fn_t fn);
  61 
  62 /* Hide internal to user */
  63 struct bpf_object;
  64 
  65 struct bpf_object_open_attr {
  66         const char *file;
  67         enum bpf_prog_type prog_type;
  68 };
  69 
  70 LIBBPF_API struct bpf_object *bpf_object__open(const char *path);
  71 LIBBPF_API struct bpf_object *
  72 bpf_object__open_xattr(struct bpf_object_open_attr *attr);
  73 struct bpf_object *__bpf_object__open_xattr(struct bpf_object_open_attr *attr,
  74                                             int flags);
  75 LIBBPF_API struct bpf_object *bpf_object__open_buffer(void *obj_buf,
  76                                                       size_t obj_buf_sz,
  77                                                       const char *name);
  78 int bpf_object__section_size(const struct bpf_object *obj, const char *name,
  79                              __u32 *size);
  80 int bpf_object__variable_offset(const struct bpf_object *obj, const char *name,
  81                                 __u32 *off);
  82 LIBBPF_API int bpf_object__pin_maps(struct bpf_object *obj, const char *path);
  83 LIBBPF_API int bpf_object__unpin_maps(struct bpf_object *obj,
  84                                       const char *path);
  85 LIBBPF_API int bpf_object__pin_programs(struct bpf_object *obj,
  86                                         const char *path);
  87 LIBBPF_API int bpf_object__unpin_programs(struct bpf_object *obj,
  88                                           const char *path);
  89 LIBBPF_API int bpf_object__pin(struct bpf_object *object, const char *path);
  90 LIBBPF_API void bpf_object__close(struct bpf_object *object);
  91 
  92 struct bpf_object_load_attr {
  93         struct bpf_object *obj;
  94         int log_level;
  95         const char *target_btf_path;
  96 };
  97 
  98 /* Load/unload object into/from kernel */
  99 LIBBPF_API int bpf_object__load(struct bpf_object *obj);
 100 LIBBPF_API int bpf_object__load_xattr(struct bpf_object_load_attr *attr);
 101 LIBBPF_API int bpf_object__unload(struct bpf_object *obj);
 102 LIBBPF_API const char *bpf_object__name(const struct bpf_object *obj);
 103 LIBBPF_API unsigned int bpf_object__kversion(const struct bpf_object *obj);
 104 
 105 struct btf;
 106 LIBBPF_API struct btf *bpf_object__btf(const struct bpf_object *obj);
 107 LIBBPF_API int bpf_object__btf_fd(const struct bpf_object *obj);
 108 
 109 LIBBPF_API struct bpf_program *
 110 bpf_object__find_program_by_title(const struct bpf_object *obj,
 111                                   const char *title);
 112 
 113 LIBBPF_API struct bpf_object *bpf_object__next(struct bpf_object *prev);
 114 #define bpf_object__for_each_safe(pos, tmp)                     \
 115         for ((pos) = bpf_object__next(NULL),            \
 116                 (tmp) = bpf_object__next(pos);          \
 117              (pos) != NULL;                             \
 118              (pos) = (tmp), (tmp) = bpf_object__next(tmp))
 119 
 120 typedef void (*bpf_object_clear_priv_t)(struct bpf_object *, void *);
 121 LIBBPF_API int bpf_object__set_priv(struct bpf_object *obj, void *priv,
 122                                     bpf_object_clear_priv_t clear_priv);
 123 LIBBPF_API void *bpf_object__priv(const struct bpf_object *prog);
 124 
 125 LIBBPF_API int
 126 libbpf_prog_type_by_name(const char *name, enum bpf_prog_type *prog_type,
 127                          enum bpf_attach_type *expected_attach_type);
 128 LIBBPF_API int libbpf_attach_type_by_name(const char *name,
 129                                           enum bpf_attach_type *attach_type);
 130 
 131 /* Accessors of bpf_program */
 132 struct bpf_program;
 133 LIBBPF_API struct bpf_program *bpf_program__next(struct bpf_program *prog,
 134                                                  const struct bpf_object *obj);
 135 
 136 #define bpf_object__for_each_program(pos, obj)          \
 137         for ((pos) = bpf_program__next(NULL, (obj));    \
 138              (pos) != NULL;                             \
 139              (pos) = bpf_program__next((pos), (obj)))
 140 
 141 LIBBPF_API struct bpf_program *bpf_program__prev(struct bpf_program *prog,
 142                                                  const struct bpf_object *obj);
 143 
 144 typedef void (*bpf_program_clear_priv_t)(struct bpf_program *, void *);
 145 
 146 LIBBPF_API int bpf_program__set_priv(struct bpf_program *prog, void *priv,
 147                                      bpf_program_clear_priv_t clear_priv);
 148 
 149 LIBBPF_API void *bpf_program__priv(const struct bpf_program *prog);
 150 LIBBPF_API void bpf_program__set_ifindex(struct bpf_program *prog,
 151                                          __u32 ifindex);
 152 
 153 LIBBPF_API const char *bpf_program__title(const struct bpf_program *prog,
 154                                           bool needs_copy);
 155 
 156 LIBBPF_API int bpf_program__load(struct bpf_program *prog, char *license,
 157                                  __u32 kern_version);
 158 LIBBPF_API int bpf_program__fd(const struct bpf_program *prog);
 159 LIBBPF_API int bpf_program__pin_instance(struct bpf_program *prog,
 160                                          const char *path,
 161                                          int instance);
 162 LIBBPF_API int bpf_program__unpin_instance(struct bpf_program *prog,
 163                                            const char *path,
 164                                            int instance);
 165 LIBBPF_API int bpf_program__pin(struct bpf_program *prog, const char *path);
 166 LIBBPF_API int bpf_program__unpin(struct bpf_program *prog, const char *path);
 167 LIBBPF_API void bpf_program__unload(struct bpf_program *prog);
 168 
 169 struct bpf_link;
 170 
 171 LIBBPF_API int bpf_link__destroy(struct bpf_link *link);
 172 
 173 LIBBPF_API struct bpf_link *
 174 bpf_program__attach_perf_event(struct bpf_program *prog, int pfd);
 175 LIBBPF_API struct bpf_link *
 176 bpf_program__attach_kprobe(struct bpf_program *prog, bool retprobe,
 177                            const char *func_name);
 178 LIBBPF_API struct bpf_link *
 179 bpf_program__attach_uprobe(struct bpf_program *prog, bool retprobe,
 180                            pid_t pid, const char *binary_path,
 181                            size_t func_offset);
 182 LIBBPF_API struct bpf_link *
 183 bpf_program__attach_tracepoint(struct bpf_program *prog,
 184                                const char *tp_category,
 185                                const char *tp_name);
 186 LIBBPF_API struct bpf_link *
 187 bpf_program__attach_raw_tracepoint(struct bpf_program *prog,
 188                                    const char *tp_name);
 189 
 190 struct bpf_insn;
 191 
 192 /*
 193  * Libbpf allows callers to adjust BPF programs before being loaded
 194  * into kernel. One program in an object file can be transformed into
 195  * multiple variants to be attached to different hooks.
 196  *
 197  * bpf_program_prep_t, bpf_program__set_prep and bpf_program__nth_fd
 198  * form an API for this purpose.
 199  *
 200  * - bpf_program_prep_t:
 201  *   Defines a 'preprocessor', which is a caller defined function
 202  *   passed to libbpf through bpf_program__set_prep(), and will be
 203  *   called before program is loaded. The processor should adjust
 204  *   the program one time for each instance according to the instance id
 205  *   passed to it.
 206  *
 207  * - bpf_program__set_prep:
 208  *   Attaches a preprocessor to a BPF program. The number of instances
 209  *   that should be created is also passed through this function.
 210  *
 211  * - bpf_program__nth_fd:
 212  *   After the program is loaded, get resulting FD of a given instance
 213  *   of the BPF program.
 214  *
 215  * If bpf_program__set_prep() is not used, the program would be loaded
 216  * without adjustment during bpf_object__load(). The program has only
 217  * one instance. In this case bpf_program__fd(prog) is equal to
 218  * bpf_program__nth_fd(prog, 0).
 219  */
 220 
 221 struct bpf_prog_prep_result {
 222         /*
 223          * If not NULL, load new instruction array.
 224          * If set to NULL, don't load this instance.
 225          */
 226         struct bpf_insn *new_insn_ptr;
 227         int new_insn_cnt;
 228 
 229         /* If not NULL, result FD is written to it. */
 230         int *pfd;
 231 };
 232 
 233 /*
 234  * Parameters of bpf_program_prep_t:
 235  *  - prog:     The bpf_program being loaded.
 236  *  - n:        Index of instance being generated.
 237  *  - insns:    BPF instructions array.
 238  *  - insns_cnt:Number of instructions in insns.
 239  *  - res:      Output parameter, result of transformation.
 240  *
 241  * Return value:
 242  *  - Zero:     pre-processing success.
 243  *  - Non-zero: pre-processing error, stop loading.
 244  */
 245 typedef int (*bpf_program_prep_t)(struct bpf_program *prog, int n,
 246                                   struct bpf_insn *insns, int insns_cnt,
 247                                   struct bpf_prog_prep_result *res);
 248 
 249 LIBBPF_API int bpf_program__set_prep(struct bpf_program *prog, int nr_instance,
 250                                      bpf_program_prep_t prep);
 251 
 252 LIBBPF_API int bpf_program__nth_fd(const struct bpf_program *prog, int n);
 253 
 254 /*
 255  * Adjust type of BPF program. Default is kprobe.
 256  */
 257 LIBBPF_API int bpf_program__set_socket_filter(struct bpf_program *prog);
 258 LIBBPF_API int bpf_program__set_tracepoint(struct bpf_program *prog);
 259 LIBBPF_API int bpf_program__set_raw_tracepoint(struct bpf_program *prog);
 260 LIBBPF_API int bpf_program__set_kprobe(struct bpf_program *prog);
 261 LIBBPF_API int bpf_program__set_sched_cls(struct bpf_program *prog);
 262 LIBBPF_API int bpf_program__set_sched_act(struct bpf_program *prog);
 263 LIBBPF_API int bpf_program__set_xdp(struct bpf_program *prog);
 264 LIBBPF_API int bpf_program__set_perf_event(struct bpf_program *prog);
 265 LIBBPF_API void bpf_program__set_type(struct bpf_program *prog,
 266                                       enum bpf_prog_type type);
 267 LIBBPF_API void
 268 bpf_program__set_expected_attach_type(struct bpf_program *prog,
 269                                       enum bpf_attach_type type);
 270 
 271 LIBBPF_API bool bpf_program__is_socket_filter(const struct bpf_program *prog);
 272 LIBBPF_API bool bpf_program__is_tracepoint(const struct bpf_program *prog);
 273 LIBBPF_API bool bpf_program__is_raw_tracepoint(const struct bpf_program *prog);
 274 LIBBPF_API bool bpf_program__is_kprobe(const struct bpf_program *prog);
 275 LIBBPF_API bool bpf_program__is_sched_cls(const struct bpf_program *prog);
 276 LIBBPF_API bool bpf_program__is_sched_act(const struct bpf_program *prog);
 277 LIBBPF_API bool bpf_program__is_xdp(const struct bpf_program *prog);
 278 LIBBPF_API bool bpf_program__is_perf_event(const struct bpf_program *prog);
 279 
 280 /*
 281  * No need for __attribute__((packed)), all members of 'bpf_map_def'
 282  * are all aligned.  In addition, using __attribute__((packed))
 283  * would trigger a -Wpacked warning message, and lead to an error
 284  * if -Werror is set.
 285  */
 286 struct bpf_map_def {
 287         unsigned int type;
 288         unsigned int key_size;
 289         unsigned int value_size;
 290         unsigned int max_entries;
 291         unsigned int map_flags;
 292 };
 293 
 294 /*
 295  * The 'struct bpf_map' in include/linux/bpf.h is internal to the kernel,
 296  * so no need to worry about a name clash.
 297  */
 298 struct bpf_map;
 299 LIBBPF_API struct bpf_map *
 300 bpf_object__find_map_by_name(const struct bpf_object *obj, const char *name);
 301 
 302 LIBBPF_API int
 303 bpf_object__find_map_fd_by_name(const struct bpf_object *obj, const char *name);
 304 
 305 /*
 306  * Get bpf_map through the offset of corresponding struct bpf_map_def
 307  * in the BPF object file.
 308  */
 309 LIBBPF_API struct bpf_map *
 310 bpf_object__find_map_by_offset(struct bpf_object *obj, size_t offset);
 311 
 312 LIBBPF_API struct bpf_map *
 313 bpf_map__next(const struct bpf_map *map, const struct bpf_object *obj);
 314 #define bpf_object__for_each_map(pos, obj)              \
 315         for ((pos) = bpf_map__next(NULL, (obj));        \
 316              (pos) != NULL;                             \
 317              (pos) = bpf_map__next((pos), (obj)))
 318 #define bpf_map__for_each bpf_object__for_each_map
 319 
 320 LIBBPF_API struct bpf_map *
 321 bpf_map__prev(const struct bpf_map *map, const struct bpf_object *obj);
 322 
 323 LIBBPF_API int bpf_map__fd(const struct bpf_map *map);
 324 LIBBPF_API const struct bpf_map_def *bpf_map__def(const struct bpf_map *map);
 325 LIBBPF_API const char *bpf_map__name(const struct bpf_map *map);
 326 LIBBPF_API __u32 bpf_map__btf_key_type_id(const struct bpf_map *map);
 327 LIBBPF_API __u32 bpf_map__btf_value_type_id(const struct bpf_map *map);
 328 
 329 typedef void (*bpf_map_clear_priv_t)(struct bpf_map *, void *);
 330 LIBBPF_API int bpf_map__set_priv(struct bpf_map *map, void *priv,
 331                                  bpf_map_clear_priv_t clear_priv);
 332 LIBBPF_API void *bpf_map__priv(const struct bpf_map *map);
 333 LIBBPF_API int bpf_map__reuse_fd(struct bpf_map *map, int fd);
 334 LIBBPF_API int bpf_map__resize(struct bpf_map *map, __u32 max_entries);
 335 LIBBPF_API bool bpf_map__is_offload_neutral(const struct bpf_map *map);
 336 LIBBPF_API bool bpf_map__is_internal(const struct bpf_map *map);
 337 LIBBPF_API void bpf_map__set_ifindex(struct bpf_map *map, __u32 ifindex);
 338 LIBBPF_API int bpf_map__pin(struct bpf_map *map, const char *path);
 339 LIBBPF_API int bpf_map__unpin(struct bpf_map *map, const char *path);
 340 
 341 LIBBPF_API int bpf_map__set_inner_map_fd(struct bpf_map *map, int fd);
 342 
 343 LIBBPF_API long libbpf_get_error(const void *ptr);
 344 
 345 struct bpf_prog_load_attr {
 346         const char *file;
 347         enum bpf_prog_type prog_type;
 348         enum bpf_attach_type expected_attach_type;
 349         int ifindex;
 350         int log_level;
 351         int prog_flags;
 352 };
 353 
 354 LIBBPF_API int bpf_prog_load_xattr(const struct bpf_prog_load_attr *attr,
 355                                    struct bpf_object **pobj, int *prog_fd);
 356 LIBBPF_API int bpf_prog_load(const char *file, enum bpf_prog_type type,
 357                              struct bpf_object **pobj, int *prog_fd);
 358 
 359 LIBBPF_API int bpf_set_link_xdp_fd(int ifindex, int fd, __u32 flags);
 360 LIBBPF_API int bpf_get_link_xdp_id(int ifindex, __u32 *prog_id, __u32 flags);
 361 
 362 struct perf_buffer;
 363 
 364 typedef void (*perf_buffer_sample_fn)(void *ctx, int cpu,
 365                                       void *data, __u32 size);
 366 typedef void (*perf_buffer_lost_fn)(void *ctx, int cpu, __u64 cnt);
 367 
 368 /* common use perf buffer options */
 369 struct perf_buffer_opts {
 370         /* if specified, sample_cb is called for each sample */
 371         perf_buffer_sample_fn sample_cb;
 372         /* if specified, lost_cb is called for each batch of lost samples */
 373         perf_buffer_lost_fn lost_cb;
 374         /* ctx is provided to sample_cb and lost_cb */
 375         void *ctx;
 376 };
 377 
 378 LIBBPF_API struct perf_buffer *
 379 perf_buffer__new(int map_fd, size_t page_cnt,
 380                  const struct perf_buffer_opts *opts);
 381 
 382 enum bpf_perf_event_ret {
 383         LIBBPF_PERF_EVENT_DONE  = 0,
 384         LIBBPF_PERF_EVENT_ERROR = -1,
 385         LIBBPF_PERF_EVENT_CONT  = -2,
 386 };
 387 
 388 struct perf_event_header;
 389 
 390 typedef enum bpf_perf_event_ret
 391 (*perf_buffer_event_fn)(void *ctx, int cpu, struct perf_event_header *event);
 392 
 393 /* raw perf buffer options, giving most power and control */
 394 struct perf_buffer_raw_opts {
 395         /* perf event attrs passed directly into perf_event_open() */
 396         struct perf_event_attr *attr;
 397         /* raw event callback */
 398         perf_buffer_event_fn event_cb;
 399         /* ctx is provided to event_cb */
 400         void *ctx;
 401         /* if cpu_cnt == 0, open all on all possible CPUs (up to the number of
 402          * max_entries of given PERF_EVENT_ARRAY map)
 403          */
 404         int cpu_cnt;
 405         /* if cpu_cnt > 0, cpus is an array of CPUs to open ring buffers on */
 406         int *cpus;
 407         /* if cpu_cnt > 0, map_keys specify map keys to set per-CPU FDs for */
 408         int *map_keys;
 409 };
 410 
 411 LIBBPF_API struct perf_buffer *
 412 perf_buffer__new_raw(int map_fd, size_t page_cnt,
 413                      const struct perf_buffer_raw_opts *opts);
 414 
 415 LIBBPF_API void perf_buffer__free(struct perf_buffer *pb);
 416 LIBBPF_API int perf_buffer__poll(struct perf_buffer *pb, int timeout_ms);
 417 
 418 typedef enum bpf_perf_event_ret
 419         (*bpf_perf_event_print_t)(struct perf_event_header *hdr,
 420                                   void *private_data);
 421 LIBBPF_API enum bpf_perf_event_ret
 422 bpf_perf_event_read_simple(void *mmap_mem, size_t mmap_size, size_t page_size,
 423                            void **copy_mem, size_t *copy_size,
 424                            bpf_perf_event_print_t fn, void *private_data);
 425 
 426 struct nlattr;
 427 typedef int (*libbpf_dump_nlmsg_t)(void *cookie, void *msg, struct nlattr **tb);
 428 int libbpf_netlink_open(unsigned int *nl_pid);
 429 int libbpf_nl_get_link(int sock, unsigned int nl_pid,
 430                        libbpf_dump_nlmsg_t dump_link_nlmsg, void *cookie);
 431 int libbpf_nl_get_class(int sock, unsigned int nl_pid, int ifindex,
 432                         libbpf_dump_nlmsg_t dump_class_nlmsg, void *cookie);
 433 int libbpf_nl_get_qdisc(int sock, unsigned int nl_pid, int ifindex,
 434                         libbpf_dump_nlmsg_t dump_qdisc_nlmsg, void *cookie);
 435 int libbpf_nl_get_filter(int sock, unsigned int nl_pid, int ifindex, int handle,
 436                          libbpf_dump_nlmsg_t dump_filter_nlmsg, void *cookie);
 437 
 438 struct bpf_prog_linfo;
 439 struct bpf_prog_info;
 440 
 441 LIBBPF_API void bpf_prog_linfo__free(struct bpf_prog_linfo *prog_linfo);
 442 LIBBPF_API struct bpf_prog_linfo *
 443 bpf_prog_linfo__new(const struct bpf_prog_info *info);
 444 LIBBPF_API const struct bpf_line_info *
 445 bpf_prog_linfo__lfind_addr_func(const struct bpf_prog_linfo *prog_linfo,
 446                                 __u64 addr, __u32 func_idx, __u32 nr_skip);
 447 LIBBPF_API const struct bpf_line_info *
 448 bpf_prog_linfo__lfind(const struct bpf_prog_linfo *prog_linfo,
 449                       __u32 insn_off, __u32 nr_skip);
 450 
 451 /*
 452  * Probe for supported system features
 453  *
 454  * Note that running many of these probes in a short amount of time can cause
 455  * the kernel to reach the maximal size of lockable memory allowed for the
 456  * user, causing subsequent probes to fail. In this case, the caller may want
 457  * to adjust that limit with setrlimit().
 458  */
 459 LIBBPF_API bool bpf_probe_prog_type(enum bpf_prog_type prog_type,
 460                                     __u32 ifindex);
 461 LIBBPF_API bool bpf_probe_map_type(enum bpf_map_type map_type, __u32 ifindex);
 462 LIBBPF_API bool bpf_probe_helper(enum bpf_func_id id,
 463                                  enum bpf_prog_type prog_type, __u32 ifindex);
 464 
 465 /*
 466  * Get bpf_prog_info in continuous memory
 467  *
 468  * struct bpf_prog_info has multiple arrays. The user has option to choose
 469  * arrays to fetch from kernel. The following APIs provide an uniform way to
 470  * fetch these data. All arrays in bpf_prog_info are stored in a single
 471  * continuous memory region. This makes it easy to store the info in a
 472  * file.
 473  *
 474  * Before writing bpf_prog_info_linear to files, it is necessary to
 475  * translate pointers in bpf_prog_info to offsets. Helper functions
 476  * bpf_program__bpil_addr_to_offs() and bpf_program__bpil_offs_to_addr()
 477  * are introduced to switch between pointers and offsets.
 478  *
 479  * Examples:
 480  *   # To fetch map_ids and prog_tags:
 481  *   __u64 arrays = (1UL << BPF_PROG_INFO_MAP_IDS) |
 482  *           (1UL << BPF_PROG_INFO_PROG_TAGS);
 483  *   struct bpf_prog_info_linear *info_linear =
 484  *           bpf_program__get_prog_info_linear(fd, arrays);
 485  *
 486  *   # To save data in file
 487  *   bpf_program__bpil_addr_to_offs(info_linear);
 488  *   write(f, info_linear, sizeof(*info_linear) + info_linear->data_len);
 489  *
 490  *   # To read data from file
 491  *   read(f, info_linear, <proper_size>);
 492  *   bpf_program__bpil_offs_to_addr(info_linear);
 493  */
 494 enum bpf_prog_info_array {
 495         BPF_PROG_INFO_FIRST_ARRAY = 0,
 496         BPF_PROG_INFO_JITED_INSNS = 0,
 497         BPF_PROG_INFO_XLATED_INSNS,
 498         BPF_PROG_INFO_MAP_IDS,
 499         BPF_PROG_INFO_JITED_KSYMS,
 500         BPF_PROG_INFO_JITED_FUNC_LENS,
 501         BPF_PROG_INFO_FUNC_INFO,
 502         BPF_PROG_INFO_LINE_INFO,
 503         BPF_PROG_INFO_JITED_LINE_INFO,
 504         BPF_PROG_INFO_PROG_TAGS,
 505         BPF_PROG_INFO_LAST_ARRAY,
 506 };
 507 
 508 struct bpf_prog_info_linear {
 509         /* size of struct bpf_prog_info, when the tool is compiled */
 510         __u32                   info_len;
 511         /* total bytes allocated for data, round up to 8 bytes */
 512         __u32                   data_len;
 513         /* which arrays are included in data */
 514         __u64                   arrays;
 515         struct bpf_prog_info    info;
 516         __u8                    data[];
 517 };
 518 
 519 LIBBPF_API struct bpf_prog_info_linear *
 520 bpf_program__get_prog_info_linear(int fd, __u64 arrays);
 521 
 522 LIBBPF_API void
 523 bpf_program__bpil_addr_to_offs(struct bpf_prog_info_linear *info_linear);
 524 
 525 LIBBPF_API void
 526 bpf_program__bpil_offs_to_addr(struct bpf_prog_info_linear *info_linear);
 527 
 528 /*
 529  * A helper function to get the number of possible CPUs before looking up
 530  * per-CPU maps. Negative errno is returned on failure.
 531  *
 532  * Example usage:
 533  *
 534  *     int ncpus = libbpf_num_possible_cpus();
 535  *     if (ncpus < 0) {
 536  *          // error handling
 537  *     }
 538  *     long values[ncpus];
 539  *     bpf_map_lookup_elem(per_cpu_map_fd, key, values);
 540  *
 541  */
 542 LIBBPF_API int libbpf_num_possible_cpus(void);
 543 
 544 #ifdef __cplusplus
 545 } /* extern "C" */
 546 #endif
 547 
 548 #endif /* __LIBBPF_LIBBPF_H */
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root/tools/lib/bpf/libbpf.h

INCLUDED FROM

DEFINITIONS
