| 1 | |
| 2 |
|
| 3 |
|
| 4 | #include <errno.h>
|
| 5 | #include <stdio.h>
|
| 6 | #include <unistd.h>
|
| 7 |
|
| 8 | #include <linux/err.h>
|
| 9 |
|
| 10 | #include <bpf/bpf.h>
|
| 11 | #include <bpf/btf.h>
|
| 12 | #include <bpf/libbpf.h>
|
| 13 |
|
| 14 | #include "json_writer.h"
|
| 15 | #include "main.h"
|
| 16 |
|
| 17 | #define STRUCT_OPS_VALUE_PREFIX "bpf_struct_ops_"
|
| 18 |
|
| 19 | static const struct btf_type *map_info_type;
|
| 20 | static __u32 map_info_alloc_len;
|
| 21 | static struct btf *btf_vmlinux;
|
| 22 | static __s32 map_info_type_id;
|
| 23 |
|
| 24 | struct res {
|
| 25 | unsigned int nr_maps;
|
| 26 | unsigned int nr_errs;
|
| 27 | };
|
| 28 |
|
| 29 | static const struct btf *get_btf_vmlinux(void)
|
| 30 | {
|
| 31 | if (btf_vmlinux)
|
| 32 | return btf_vmlinux;
|
| 33 |
|
| 34 | btf_vmlinux = libbpf_find_kernel_btf();
|
| 35 | if (!btf_vmlinux)
|
| 36 | p_err("struct_ops requires kernel CONFIG_DEBUG_INFO_BTF=y");
|
| 37 |
|
| 38 | return btf_vmlinux;
|
| 39 | }
|
| 40 |
|
| 41 | static const char *get_kern_struct_ops_name(const struct bpf_map_info *info)
|
| 42 | {
|
| 43 | const struct btf *kern_btf;
|
| 44 | const struct btf_type *t;
|
| 45 | const char *st_ops_name;
|
| 46 |
|
| 47 | kern_btf = get_btf_vmlinux();
|
| 48 | if (!kern_btf)
|
| 49 | return "<btf_vmlinux_not_found>";
|
| 50 |
|
| 51 | t = btf__type_by_id(kern_btf, info->btf_vmlinux_value_type_id);
|
| 52 | st_ops_name = btf__name_by_offset(kern_btf, t->name_off);
|
| 53 | st_ops_name += strlen(STRUCT_OPS_VALUE_PREFIX);
|
| 54 |
|
| 55 | return st_ops_name;
|
| 56 | }
|
| 57 |
|
| 58 | static __s32 get_map_info_type_id(void)
|
| 59 | {
|
| 60 | const struct btf *kern_btf;
|
| 61 |
|
| 62 | if (map_info_type_id)
|
| 63 | return map_info_type_id;
|
| 64 |
|
| 65 | kern_btf = get_btf_vmlinux();
|
| 66 | if (!kern_btf)
|
| 67 | return 0;
|
| 68 |
|
| 69 | map_info_type_id = btf__find_by_name_kind(kern_btf, "bpf_map_info",
|
| 70 | BTF_KIND_STRUCT);
|
| 71 | if (map_info_type_id < 0) {
|
| 72 | p_err("can't find bpf_map_info from btf_vmlinux");
|
| 73 | return map_info_type_id;
|
| 74 | }
|
| 75 | map_info_type = btf__type_by_id(kern_btf, map_info_type_id);
|
| 76 |
|
| 77 |
|
| 78 | map_info_alloc_len = map_info_type->size;
|
| 79 | if (map_info_alloc_len < sizeof(struct bpf_map_info))
|
| 80 | map_info_alloc_len = sizeof(struct bpf_map_info);
|
| 81 |
|
| 82 | return map_info_type_id;
|
| 83 | }
|
| 84 |
|
| 85 | |
| 86 | * it should always call map_info_alloc to allocate
|
| 87 | * a bpf_map_info object instead of allocating it
|
| 88 | * on the stack.
|
| 89 | *
|
| 90 | * map_info_alloc() will take the running kernel's btf
|
| 91 | * into account. i.e. it will consider the
|
| 92 | * sizeof(struct bpf_map_info) of the running kernel.
|
| 93 | *
|
| 94 | * It will enable the "struct_ops" cmd to print the latest
|
| 95 | * "struct bpf_map_info".
|
| 96 | *
|
| 97 | * [ Recall that "struct_ops" requires the kernel's btf to
|
| 98 | * be available ]
|
| 99 |
|
| 100 | static struct bpf_map_info *map_info_alloc(__u32 *alloc_len)
|
| 101 | {
|
| 102 | struct bpf_map_info *info;
|
| 103 |
|
| 104 | if (get_map_info_type_id() < 0)
|
| 105 | return NULL;
|
| 106 |
|
| 107 | info = calloc(1, map_info_alloc_len);
|
| 108 | if (!info)
|
| 109 | p_err("mem alloc failed");
|
| 110 | else
|
| 111 | *alloc_len = map_info_alloc_len;
|
| 112 |
|
| 113 | return info;
|
| 114 | }
|
| 115 |
|
| 116 | |
| 117 | * It returns the fd in "*res_fd" and map_info in "*info".
|
| 118 | * In the very first iteration, info->id should be 0.
|
| 119 | * An optional map "*name" filter can be specified.
|
| 120 | * The filter can be made more flexible in the future.
|
| 121 | * e.g. filter by kernel-struct-ops-name, regex-name, glob-name, ...etc.
|
| 122 | *
|
| 123 | * Return value:
|
| 124 | * 1: A struct_ops map found. It is returned in "*res_fd" and "*info".
|
| 125 | * The caller can continue to call get_next in the future.
|
| 126 | * 0: No struct_ops map is returned.
|
| 127 | * All struct_ops map has been found.
|
| 128 | * -1: Error and the caller should abort the iteration.
|
| 129 |
|
| 130 | static int get_next_struct_ops_map(const char *name, int *res_fd,
|
| 131 | struct bpf_map_info *info, __u32 info_len)
|
| 132 | {
|
| 133 | __u32 id = info->id;
|
| 134 | int err, fd;
|
| 135 |
|
| 136 | while (true) {
|
| 137 | err = bpf_map_get_next_id(id, &id);
|
| 138 | if (err) {
|
| 139 | if (errno == ENOENT)
|
| 140 | return 0;
|
| 141 | p_err("can't get next map: %s", strerror(errno));
|
| 142 | return -1;
|
| 143 | }
|
| 144 |
|
| 145 | fd = bpf_map_get_fd_by_id(id);
|
| 146 | if (fd < 0) {
|
| 147 | if (errno == ENOENT)
|
| 148 | continue;
|
| 149 | p_err("can't get map by id (%u): %s",
|
| 150 | id, strerror(errno));
|
| 151 | return -1;
|
| 152 | }
|
| 153 |
|
| 154 | err = bpf_map_get_info_by_fd(fd, info, &info_len);
|
| 155 | if (err) {
|
| 156 | p_err("can't get map info: %s", strerror(errno));
|
| 157 | close(fd);
|
| 158 | return -1;
|
| 159 | }
|
| 160 |
|
| 161 | if (info->type == BPF_MAP_TYPE_STRUCT_OPS &&
|
| 162 | (!name || !strcmp(name, info->name))) {
|
| 163 | *res_fd = fd;
|
| 164 | return 1;
|
| 165 | }
|
| 166 | close(fd);
|
| 167 | }
|
| 168 | }
|
| 169 |
|
| 170 | static int cmd_retval(const struct res *res, bool must_have_one_map)
|
| 171 | {
|
| 172 | if (res->nr_errs || (!res->nr_maps && must_have_one_map))
|
| 173 | return -1;
|
| 174 |
|
| 175 | return 0;
|
| 176 | }
|
| 177 |
|
| 178 |
|
| 179 | typedef int (*work_func)(int fd, const struct bpf_map_info *info, void *data,
|
| 180 | struct json_writer *wtr);
|
| 181 |
|
| 182 | |
| 183 | * Filter out by "name" (if specified).
|
| 184 | * Then call "func(fd, info, data, wtr)" on each struct_ops map found.
|
| 185 |
|
| 186 | static struct res do_search(const char *name, work_func func, void *data,
|
| 187 | struct json_writer *wtr)
|
| 188 | {
|
| 189 | struct bpf_map_info *info;
|
| 190 | struct res res = {};
|
| 191 | __u32 info_len;
|
| 192 | int fd, err;
|
| 193 |
|
| 194 | info = map_info_alloc(&info_len);
|
| 195 | if (!info) {
|
| 196 | res.nr_errs++;
|
| 197 | return res;
|
| 198 | }
|
| 199 |
|
| 200 | if (wtr)
|
| 201 | jsonw_start_array(wtr);
|
| 202 | while ((err = get_next_struct_ops_map(name, &fd, info, info_len)) == 1) {
|
| 203 | res.nr_maps++;
|
| 204 | err = func(fd, info, data, wtr);
|
| 205 | if (err)
|
| 206 | res.nr_errs++;
|
| 207 | close(fd);
|
| 208 | }
|
| 209 | if (wtr)
|
| 210 | jsonw_end_array(wtr);
|
| 211 |
|
| 212 | if (err)
|
| 213 | res.nr_errs++;
|
| 214 |
|
| 215 | if (!wtr && name && !res.nr_errs && !res.nr_maps)
|
| 216 | |
| 217 | * Thus, needs to specifically say nothing found
|
| 218 | * for "name" here.
|
| 219 |
|
| 220 | p_err("no struct_ops found for %s", name);
|
| 221 | else if (!wtr && json_output && !res.nr_errs)
|
| 222 | |
| 223 | * test here).
|
| 224 | *
|
| 225 | * However, "-j" is enabled and there is no errs here,
|
| 226 | * so call json_null() as the current convention of
|
| 227 | * other cmds.
|
| 228 |
|
| 229 | jsonw_null(json_wtr);
|
| 230 |
|
| 231 | free(info);
|
| 232 | return res;
|
| 233 | }
|
| 234 |
|
| 235 | static struct res do_one_id(const char *id_str, work_func func, void *data,
|
| 236 | struct json_writer *wtr)
|
| 237 | {
|
| 238 | struct bpf_map_info *info;
|
| 239 | struct res res = {};
|
| 240 | unsigned long id;
|
| 241 | __u32 info_len;
|
| 242 | char *endptr;
|
| 243 | int fd;
|
| 244 |
|
| 245 | id = strtoul(id_str, &endptr, 0);
|
| 246 | if (*endptr || !id || id > UINT32_MAX) {
|
| 247 | p_err("invalid id %s", id_str);
|
| 248 | res.nr_errs++;
|
| 249 | return res;
|
| 250 | }
|
| 251 |
|
| 252 | fd = bpf_map_get_fd_by_id(id);
|
| 253 | if (fd < 0) {
|
| 254 | p_err("can't get map by id (%lu): %s", id, strerror(errno));
|
| 255 | res.nr_errs++;
|
| 256 | return res;
|
| 257 | }
|
| 258 |
|
| 259 | info = map_info_alloc(&info_len);
|
| 260 | if (!info) {
|
| 261 | res.nr_errs++;
|
| 262 | goto done;
|
| 263 | }
|
| 264 |
|
| 265 | if (bpf_map_get_info_by_fd(fd, info, &info_len)) {
|
| 266 | p_err("can't get map info: %s", strerror(errno));
|
| 267 | res.nr_errs++;
|
| 268 | goto done;
|
| 269 | }
|
| 270 |
|
| 271 | if (info->type != BPF_MAP_TYPE_STRUCT_OPS) {
|
| 272 | p_err("%s id %u is not a struct_ops map", info->name, info->id);
|
| 273 | res.nr_errs++;
|
| 274 | goto done;
|
| 275 | }
|
| 276 |
|
| 277 | res.nr_maps++;
|
| 278 |
|
| 279 | if (wtr)
|
| 280 | jsonw_start_array(wtr);
|
| 281 |
|
| 282 | if (func(fd, info, data, wtr))
|
| 283 | res.nr_errs++;
|
| 284 | else if (!wtr && json_output)
|
| 285 | |
| 286 | * test here).
|
| 287 | *
|
| 288 | * However, "-j" is enabled and there is no errs here,
|
| 289 | * so call json_null() as the current convention of
|
| 290 | * other cmds.
|
| 291 |
|
| 292 | jsonw_null(json_wtr);
|
| 293 |
|
| 294 | if (wtr)
|
| 295 | jsonw_end_array(wtr);
|
| 296 |
|
| 297 | done:
|
| 298 | free(info);
|
| 299 | close(fd);
|
| 300 |
|
| 301 | return res;
|
| 302 | }
|
| 303 |
|
| 304 | static struct res do_work_on_struct_ops(const char *search_type,
|
| 305 | const char *search_term,
|
| 306 | work_func func, void *data,
|
| 307 | struct json_writer *wtr)
|
| 308 | {
|
| 309 | if (search_type) {
|
| 310 | if (is_prefix(search_type, "id"))
|
| 311 | return do_one_id(search_term, func, data, wtr);
|
| 312 | else if (!is_prefix(search_type, "name"))
|
| 313 | usage();
|
| 314 | }
|
| 315 |
|
| 316 | return do_search(search_term, func, data, wtr);
|
| 317 | }
|
| 318 |
|
| 319 | static int __do_show(int fd, const struct bpf_map_info *info, void *data,
|
| 320 | struct json_writer *wtr)
|
| 321 | {
|
| 322 | if (wtr) {
|
| 323 | jsonw_start_object(wtr);
|
| 324 | jsonw_uint_field(wtr, "id", info->id);
|
| 325 | jsonw_string_field(wtr, "name", info->name);
|
| 326 | jsonw_string_field(wtr, "kernel_struct_ops",
|
| 327 | get_kern_struct_ops_name(info));
|
| 328 | jsonw_end_object(wtr);
|
| 329 | } else {
|
| 330 | printf("%u: %-15s %-32s\n", info->id, info->name,
|
| 331 | get_kern_struct_ops_name(info));
|
| 332 | }
|
| 333 |
|
| 334 | return 0;
|
| 335 | }
|
| 336 |
|
| 337 | static int do_show(int argc, char **argv)
|
| 338 | {
|
| 339 | const char *search_type = NULL, *search_term = NULL;
|
| 340 | struct res res;
|
| 341 |
|
| 342 | if (argc && argc != 2)
|
| 343 | usage();
|
| 344 |
|
| 345 | if (argc == 2) {
|
| 346 | search_type = GET_ARG();
|
| 347 | search_term = GET_ARG();
|
| 348 | }
|
| 349 |
|
| 350 | res = do_work_on_struct_ops(search_type, search_term, __do_show,
|
| 351 | NULL, json_wtr);
|
| 352 |
|
| 353 | return cmd_retval(&res, !!search_term);
|
| 354 | }
|
| 355 |
|
| 356 | static int __do_dump(int fd, const struct bpf_map_info *info, void *data,
|
| 357 | struct json_writer *wtr)
|
| 358 | {
|
| 359 | struct btf_dumper *d = (struct btf_dumper *)data;
|
| 360 | const struct btf_type *struct_ops_type;
|
| 361 | const struct btf *kern_btf = d->btf;
|
| 362 | const char *struct_ops_name;
|
| 363 | int zero = 0;
|
| 364 | void *value;
|
| 365 |
|
| 366 |
|
| 367 |
|
| 368 | kern_btf = d->btf;
|
| 369 |
|
| 370 | |
| 371 | * btf_vmlinux_value_type_id.
|
| 372 |
|
| 373 | struct_ops_type = btf__type_by_id(kern_btf,
|
| 374 | info->btf_vmlinux_value_type_id);
|
| 375 | struct_ops_name = btf__name_by_offset(kern_btf,
|
| 376 | struct_ops_type->name_off);
|
| 377 | value = calloc(1, info->value_size);
|
| 378 | if (!value) {
|
| 379 | p_err("mem alloc failed");
|
| 380 | return -1;
|
| 381 | }
|
| 382 |
|
| 383 | if (bpf_map_lookup_elem(fd, &zero, value)) {
|
| 384 | p_err("can't lookup struct_ops map %s id %u",
|
| 385 | info->name, info->id);
|
| 386 | free(value);
|
| 387 | return -1;
|
| 388 | }
|
| 389 |
|
| 390 | jsonw_start_object(wtr);
|
| 391 | jsonw_name(wtr, "bpf_map_info");
|
| 392 | btf_dumper_type(d, map_info_type_id, (void *)info);
|
| 393 | jsonw_end_object(wtr);
|
| 394 |
|
| 395 | jsonw_start_object(wtr);
|
| 396 | jsonw_name(wtr, struct_ops_name);
|
| 397 | btf_dumper_type(d, info->btf_vmlinux_value_type_id, value);
|
| 398 | jsonw_end_object(wtr);
|
| 399 |
|
| 400 | free(value);
|
| 401 |
|
| 402 | return 0;
|
| 403 | }
|
| 404 |
|
| 405 | static int do_dump(int argc, char **argv)
|
| 406 | {
|
| 407 | const char *search_type = NULL, *search_term = NULL;
|
| 408 | json_writer_t *wtr = json_wtr;
|
| 409 | const struct btf *kern_btf;
|
| 410 | struct btf_dumper d = {};
|
| 411 | struct res res;
|
| 412 |
|
| 413 | if (argc && argc != 2)
|
| 414 | usage();
|
| 415 |
|
| 416 | if (argc == 2) {
|
| 417 | search_type = GET_ARG();
|
| 418 | search_term = GET_ARG();
|
| 419 | }
|
| 420 |
|
| 421 | kern_btf = get_btf_vmlinux();
|
| 422 | if (!kern_btf)
|
| 423 | return -1;
|
| 424 |
|
| 425 | if (!json_output) {
|
| 426 | wtr = jsonw_new(stdout);
|
| 427 | if (!wtr) {
|
| 428 | p_err("can't create json writer");
|
| 429 | return -1;
|
| 430 | }
|
| 431 | jsonw_pretty(wtr, true);
|
| 432 | }
|
| 433 |
|
| 434 | d.btf = kern_btf;
|
| 435 | d.jw = wtr;
|
| 436 | d.is_plain_text = !json_output;
|
| 437 | d.prog_id_as_func_ptr = true;
|
| 438 |
|
| 439 | res = do_work_on_struct_ops(search_type, search_term, __do_dump, &d,
|
| 440 | wtr);
|
| 441 |
|
| 442 | if (!json_output)
|
| 443 | jsonw_destroy(&wtr);
|
| 444 |
|
| 445 | return cmd_retval(&res, !!search_term);
|
| 446 | }
|
| 447 |
|
| 448 | static int __do_unregister(int fd, const struct bpf_map_info *info, void *data,
|
| 449 | struct json_writer *wtr)
|
| 450 | {
|
| 451 | int zero = 0;
|
| 452 |
|
| 453 | if (bpf_map_delete_elem(fd, &zero)) {
|
| 454 | p_err("can't unload %s %s id %u: %s",
|
| 455 | get_kern_struct_ops_name(info), info->name,
|
| 456 | info->id, strerror(errno));
|
| 457 | return -1;
|
| 458 | }
|
| 459 |
|
| 460 | p_info("Unregistered %s %s id %u",
|
| 461 | get_kern_struct_ops_name(info), info->name,
|
| 462 | info->id);
|
| 463 |
|
| 464 | return 0;
|
| 465 | }
|
| 466 |
|
| 467 | static int do_unregister(int argc, char **argv)
|
| 468 | {
|
| 469 | const char *search_type, *search_term;
|
| 470 | struct res res;
|
| 471 |
|
| 472 | if (argc != 2)
|
| 473 | usage();
|
| 474 |
|
| 475 | search_type = GET_ARG();
|
| 476 | search_term = GET_ARG();
|
| 477 |
|
| 478 | res = do_work_on_struct_ops(search_type, search_term,
|
| 479 | __do_unregister, NULL, NULL);
|
| 480 |
|
| 481 | return cmd_retval(&res, true);
|
| 482 | }
|
| 483 |
|
| 484 | static int pin_link(struct bpf_link *link, const char *pindir,
|
| 485 | const char *name)
|
| 486 | {
|
| 487 | char pinfile[PATH_MAX];
|
| 488 | int err;
|
| 489 |
|
| 490 | err = pathname_concat(pinfile, sizeof(pinfile), pindir, name);
|
| 491 | if (err)
|
| 492 | return -1;
|
| 493 |
|
| 494 | return bpf_link__pin(link, pinfile);
|
| 495 | }
|
| 496 |
|
| 497 | static int do_register(int argc, char **argv)
|
| 498 | {
|
| 499 | LIBBPF_OPTS(bpf_object_open_opts, open_opts);
|
| 500 | __u32 link_info_len = sizeof(struct bpf_link_info);
|
| 501 | struct bpf_link_info link_info = {};
|
| 502 | struct bpf_map_info info = {};
|
| 503 | __u32 info_len = sizeof(info);
|
| 504 | int nr_errs = 0, nr_maps = 0;
|
| 505 | const char *linkdir = NULL;
|
| 506 | struct bpf_object *obj;
|
| 507 | struct bpf_link *link;
|
| 508 | struct bpf_map *map;
|
| 509 | const char *file;
|
| 510 |
|
| 511 | if (argc != 1 && argc != 2)
|
| 512 | usage();
|
| 513 |
|
| 514 | file = GET_ARG();
|
| 515 | if (argc == 1)
|
| 516 | linkdir = GET_ARG();
|
| 517 |
|
| 518 | if (linkdir && create_and_mount_bpffs_dir(linkdir)) {
|
| 519 | p_err("can't mount bpffs for pinning");
|
| 520 | return -1;
|
| 521 | }
|
| 522 |
|
| 523 | if (verifier_logs)
|
| 524 |
|
| 525 | open_opts.kernel_log_level = 1 + 2 + 4;
|
| 526 |
|
| 527 | obj = bpf_object__open_file(file, &open_opts);
|
| 528 | if (!obj)
|
| 529 | return -1;
|
| 530 |
|
| 531 | set_max_rlimit();
|
| 532 |
|
| 533 | if (bpf_object__load(obj)) {
|
| 534 | bpf_object__close(obj);
|
| 535 | return -1;
|
| 536 | }
|
| 537 |
|
| 538 | bpf_object__for_each_map(map, obj) {
|
| 539 | if (bpf_map__type(map) != BPF_MAP_TYPE_STRUCT_OPS)
|
| 540 | continue;
|
| 541 |
|
| 542 | link = bpf_map__attach_struct_ops(map);
|
| 543 | if (!link) {
|
| 544 | p_err("can't register struct_ops %s: %s",
|
| 545 | bpf_map__name(map), strerror(errno));
|
| 546 | nr_errs++;
|
| 547 | continue;
|
| 548 | }
|
| 549 | nr_maps++;
|
| 550 |
|
| 551 | if (bpf_map_get_info_by_fd(bpf_map__fd(map), &info,
|
| 552 | &info_len)) {
|
| 553 | |
| 554 | * successfully.
|
| 555 |
|
| 556 | p_info("Registered %s but can't find id: %s",
|
| 557 | bpf_map__name(map), strerror(errno));
|
| 558 | goto clean_link;
|
| 559 | }
|
| 560 | if (!(bpf_map__map_flags(map) & BPF_F_LINK)) {
|
| 561 | p_info("Registered %s %s id %u",
|
| 562 | get_kern_struct_ops_name(&info),
|
| 563 | info.name,
|
| 564 | info.id);
|
| 565 | goto clean_link;
|
| 566 | }
|
| 567 | if (bpf_link_get_info_by_fd(bpf_link__fd(link),
|
| 568 | &link_info,
|
| 569 | &link_info_len)) {
|
| 570 | p_err("Registered %s but can't find link id: %s",
|
| 571 | bpf_map__name(map), strerror(errno));
|
| 572 | nr_errs++;
|
| 573 | goto clean_link;
|
| 574 | }
|
| 575 | if (linkdir && pin_link(link, linkdir, info.name)) {
|
| 576 | p_err("can't pin link %u for %s: %s",
|
| 577 | link_info.id, info.name,
|
| 578 | strerror(errno));
|
| 579 | nr_errs++;
|
| 580 | goto clean_link;
|
| 581 | }
|
| 582 | p_info("Registered %s %s map id %u link id %u",
|
| 583 | get_kern_struct_ops_name(&info),
|
| 584 | info.name, info.id, link_info.id);
|
| 585 |
|
| 586 | clean_link:
|
| 587 | bpf_link__disconnect(link);
|
| 588 | bpf_link__destroy(link);
|
| 589 | }
|
| 590 |
|
| 591 | bpf_object__close(obj);
|
| 592 |
|
| 593 | if (nr_errs)
|
| 594 | return -1;
|
| 595 |
|
| 596 | if (!nr_maps) {
|
| 597 | p_err("no struct_ops found in %s", file);
|
| 598 | return -1;
|
| 599 | }
|
| 600 |
|
| 601 | if (json_output)
|
| 602 | jsonw_null(json_wtr);
|
| 603 |
|
| 604 | return 0;
|
| 605 | }
|
| 606 |
|
| 607 | static int do_help(int argc, char **argv)
|
| 608 | {
|
| 609 | if (json_output) {
|
| 610 | jsonw_null(json_wtr);
|
| 611 | return 0;
|
| 612 | }
|
| 613 |
|
| 614 | fprintf(stderr,
|
| 615 | "Usage: %1$s %2$s { show | list } [STRUCT_OPS_MAP]\n"
|
| 616 | " %1$s %2$s dump [STRUCT_OPS_MAP]\n"
|
| 617 | " %1$s %2$s register OBJ [LINK_DIR]\n"
|
| 618 | " %1$s %2$s unregister STRUCT_OPS_MAP\n"
|
| 619 | " %1$s %2$s help\n"
|
| 620 | "\n"
|
| 621 | " STRUCT_OPS_MAP := [ id STRUCT_OPS_MAP_ID | name STRUCT_OPS_MAP_NAME ]\n"
|
| 622 | " " HELP_SPEC_OPTIONS " }\n"
|
| 623 | "",
|
| 624 | bin_name, argv[-2]);
|
| 625 |
|
| 626 | return 0;
|
| 627 | }
|
| 628 |
|
| 629 | static const struct cmd cmds[] = {
|
| 630 | { "show", do_show },
|
| 631 | { "list", do_show },
|
| 632 | { "register", do_register },
|
| 633 | { "unregister", do_unregister },
|
| 634 | { "dump", do_dump },
|
| 635 | { "help", do_help },
|
| 636 | { 0 }
|
| 637 | };
|
| 638 |
|
| 639 | int do_struct_ops(int argc, char **argv)
|
| 640 | {
|
| 641 | int err;
|
| 642 |
|
| 643 | err = cmd_select(cmds, argc, argv, do_help);
|
| 644 |
|
| 645 | btf__free(btf_vmlinux);
|
| 646 | btf_vmlinux = NULL;
|
| 647 | map_info_type = NULL;
|
| 648 | map_info_alloc_len = 0;
|
| 649 | map_info_type_id = 0;
|
| 650 |
|
| 651 | return err;
|
| 652 | }
|