1 // SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) 2 /* Copyright (C) 2017-2018 Netronome Systems, Inc. */ 3 4 #define _GNU_SOURCE 5 #include <errno.h> 6 #include <fcntl.h> 7 #include <signal.h> 8 #include <stdarg.h> 9 #include <stdio.h> 10 #include <stdlib.h> 11 #include <string.h> 12 #include <time.h> 13 #include <unistd.h> 14 #include <net/if.h> 15 #include <sys/ioctl.h> 16 #include <sys/types.h> 17 #include <sys/stat.h> 18 #include <sys/syscall.h> 19 #include <dirent.h> 20 21 #include <linux/err.h> 22 #include <linux/perf_event.h> 23 #include <linux/sizes.h> 24 25 #include <bpf/bpf.h> 26 #include <bpf/btf.h> 27 #include <bpf/hashmap.h> 28 #include <bpf/libbpf.h> 29 #include <bpf/libbpf_internal.h> 30 #include <bpf/skel_internal.h> 31 32 #include "cfg.h" 33 #include "main.h" 34 #include "xlated_dumper.h" 35 36 #define BPF_METADATA_PREFIX "bpf_metadata_" 37 #define BPF_METADATA_PREFIX_LEN (sizeof(BPF_METADATA_PREFIX) - 1) 38 39 enum dump_mode { 40 DUMP_JITED, 41 DUMP_XLATED, 42 }; 43 44 static const bool attach_types[] = { 45 [BPF_SK_SKB_STREAM_PARSER] = true, 46 [BPF_SK_SKB_STREAM_VERDICT] = true, 47 [BPF_SK_SKB_VERDICT] = true, 48 [BPF_SK_MSG_VERDICT] = true, 49 [BPF_FLOW_DISSECTOR] = true, 50 [__MAX_BPF_ATTACH_TYPE] = false, 51 }; 52 53 /* Textual representations traditionally used by the program and kept around 54 * for the sake of backwards compatibility. 55 */ 56 static const char * const attach_type_strings[] = { 57 [BPF_SK_SKB_STREAM_PARSER] = "stream_parser", 58 [BPF_SK_SKB_STREAM_VERDICT] = "stream_verdict", 59 [BPF_SK_SKB_VERDICT] = "skb_verdict", 60 [BPF_SK_MSG_VERDICT] = "msg_verdict", 61 [__MAX_BPF_ATTACH_TYPE] = NULL, 62 }; 63 64 static struct hashmap *prog_table; 65 66 static enum bpf_attach_type parse_attach_type(const char *str) 67 { 68 enum bpf_attach_type type; 69 70 for (type = 0; type < __MAX_BPF_ATTACH_TYPE; type++) { 71 if (attach_types[type]) { 72 const char *attach_type_str; 73 74 attach_type_str = libbpf_bpf_attach_type_str(type); 75 if (!strcmp(str, attach_type_str)) 76 return type; 77 } 78 79 if (attach_type_strings[type] && 80 is_prefix(str, attach_type_strings[type])) 81 return type; 82 } 83 84 return __MAX_BPF_ATTACH_TYPE; 85 } 86 87 static int prep_prog_info(struct bpf_prog_info *const info, enum dump_mode mode, 88 void **info_data, size_t *const info_data_sz) 89 { 90 struct bpf_prog_info holder = {}; 91 size_t needed = 0; 92 void *ptr; 93 94 if (mode == DUMP_JITED) { 95 holder.jited_prog_len = info->jited_prog_len; 96 needed += info->jited_prog_len; 97 } else { 98 holder.xlated_prog_len = info->xlated_prog_len; 99 needed += info->xlated_prog_len; 100 } 101 102 holder.nr_jited_ksyms = info->nr_jited_ksyms; 103 needed += info->nr_jited_ksyms * sizeof(__u64); 104 105 holder.nr_jited_func_lens = info->nr_jited_func_lens; 106 needed += info->nr_jited_func_lens * sizeof(__u32); 107 108 holder.nr_func_info = info->nr_func_info; 109 holder.func_info_rec_size = info->func_info_rec_size; 110 needed += info->nr_func_info * info->func_info_rec_size; 111 112 holder.nr_line_info = info->nr_line_info; 113 holder.line_info_rec_size = info->line_info_rec_size; 114 needed += info->nr_line_info * info->line_info_rec_size; 115 116 holder.nr_jited_line_info = info->nr_jited_line_info; 117 holder.jited_line_info_rec_size = info->jited_line_info_rec_size; 118 needed += info->nr_jited_line_info * info->jited_line_info_rec_size; 119 120 if (needed > *info_data_sz) { 121 ptr = realloc(*info_data, needed); 122 if (!ptr) 123 return -1; 124 125 *info_data = ptr; 126 *info_data_sz = needed; 127 } 128 ptr = *info_data; 129 130 if (mode == DUMP_JITED) { 131 holder.jited_prog_insns = ptr_to_u64(ptr); 132 ptr += holder.jited_prog_len; 133 } else { 134 holder.xlated_prog_insns = ptr_to_u64(ptr); 135 ptr += holder.xlated_prog_len; 136 } 137 138 holder.jited_ksyms = ptr_to_u64(ptr); 139 ptr += holder.nr_jited_ksyms * sizeof(__u64); 140 141 holder.jited_func_lens = ptr_to_u64(ptr); 142 ptr += holder.nr_jited_func_lens * sizeof(__u32); 143 144 holder.func_info = ptr_to_u64(ptr); 145 ptr += holder.nr_func_info * holder.func_info_rec_size; 146 147 holder.line_info = ptr_to_u64(ptr); 148 ptr += holder.nr_line_info * holder.line_info_rec_size; 149 150 holder.jited_line_info = ptr_to_u64(ptr); 151 ptr += holder.nr_jited_line_info * holder.jited_line_info_rec_size; 152 153 *info = holder; 154 return 0; 155 } 156 157 static void print_boot_time(__u64 nsecs, char *buf, unsigned int size) 158 { 159 struct timespec real_time_ts, boot_time_ts; 160 time_t wallclock_secs; 161 struct tm load_tm; 162 163 buf[--size] = '\0'; 164 165 if (clock_gettime(CLOCK_REALTIME, &real_time_ts) || 166 clock_gettime(CLOCK_BOOTTIME, &boot_time_ts)) { 167 perror("Can't read clocks"); 168 snprintf(buf, size, "%llu", nsecs / 1000000000); 169 return; 170 } 171 172 wallclock_secs = (real_time_ts.tv_sec - boot_time_ts.tv_sec) + 173 (real_time_ts.tv_nsec - boot_time_ts.tv_nsec + nsecs) / 174 1000000000; 175 176 177 if (!localtime_r(&wallclock_secs, &load_tm)) { 178 snprintf(buf, size, "%llu", nsecs / 1000000000); 179 return; 180 } 181 182 if (json_output) 183 strftime(buf, size, "%s", &load_tm); 184 else 185 strftime(buf, size, "%FT%T%z", &load_tm); 186 } 187 188 static void show_prog_maps(int fd, __u32 num_maps) 189 { 190 struct bpf_prog_info info = {}; 191 __u32 len = sizeof(info); 192 __u32 map_ids[num_maps]; 193 unsigned int i; 194 int err; 195 196 info.nr_map_ids = num_maps; 197 info.map_ids = ptr_to_u64(map_ids); 198 199 err = bpf_obj_get_info_by_fd(fd, &info, &len); 200 if (err || !info.nr_map_ids) 201 return; 202 203 if (json_output) { 204 jsonw_name(json_wtr, "map_ids"); 205 jsonw_start_array(json_wtr); 206 for (i = 0; i < info.nr_map_ids; i++) 207 jsonw_uint(json_wtr, map_ids[i]); 208 jsonw_end_array(json_wtr); 209 } else { 210 printf(" map_ids "); 211 for (i = 0; i < info.nr_map_ids; i++) 212 printf("%u%s", map_ids[i], 213 i == info.nr_map_ids - 1 ? "" : ","); 214 } 215 } 216 217 static void *find_metadata(int prog_fd, struct bpf_map_info *map_info) 218 { 219 struct bpf_prog_info prog_info; 220 __u32 prog_info_len; 221 __u32 map_info_len; 222 void *value = NULL; 223 __u32 *map_ids; 224 int nr_maps; 225 int key = 0; 226 int map_fd; 227 int ret; 228 __u32 i; 229 230 memset(&prog_info, 0, sizeof(prog_info)); 231 prog_info_len = sizeof(prog_info); 232 ret = bpf_obj_get_info_by_fd(prog_fd, &prog_info, &prog_info_len); 233 if (ret) 234 return NULL; 235 236 if (!prog_info.nr_map_ids) 237 return NULL; 238 239 map_ids = calloc(prog_info.nr_map_ids, sizeof(__u32)); 240 if (!map_ids) 241 return NULL; 242 243 nr_maps = prog_info.nr_map_ids; 244 memset(&prog_info, 0, sizeof(prog_info)); 245 prog_info.nr_map_ids = nr_maps; 246 prog_info.map_ids = ptr_to_u64(map_ids); 247 prog_info_len = sizeof(prog_info); 248 249 ret = bpf_obj_get_info_by_fd(prog_fd, &prog_info, &prog_info_len); 250 if (ret) 251 goto free_map_ids; 252 253 for (i = 0; i < prog_info.nr_map_ids; i++) { 254 map_fd = bpf_map_get_fd_by_id(map_ids[i]); 255 if (map_fd < 0) 256 goto free_map_ids; 257 258 memset(map_info, 0, sizeof(*map_info)); 259 map_info_len = sizeof(*map_info); 260 ret = bpf_obj_get_info_by_fd(map_fd, map_info, &map_info_len); 261 if (ret < 0) { 262 close(map_fd); 263 goto free_map_ids; 264 } 265 266 if (map_info->type != BPF_MAP_TYPE_ARRAY || 267 map_info->key_size != sizeof(int) || 268 map_info->max_entries != 1 || 269 !map_info->btf_value_type_id || 270 !strstr(map_info->name, ".rodata")) { 271 close(map_fd); 272 continue; 273 } 274 275 value = malloc(map_info->value_size); 276 if (!value) { 277 close(map_fd); 278 goto free_map_ids; 279 } 280 281 if (bpf_map_lookup_elem(map_fd, &key, value)) { 282 close(map_fd); 283 free(value); 284 value = NULL; 285 goto free_map_ids; 286 } 287 288 close(map_fd); 289 break; 290 } 291 292 free_map_ids: 293 free(map_ids); 294 return value; 295 } 296 297 static bool has_metadata_prefix(const char *s) 298 { 299 return strncmp(s, BPF_METADATA_PREFIX, BPF_METADATA_PREFIX_LEN) == 0; 300 } 301 302 static void show_prog_metadata(int fd, __u32 num_maps) 303 { 304 const struct btf_type *t_datasec, *t_var; 305 struct bpf_map_info map_info; 306 struct btf_var_secinfo *vsi; 307 bool printed_header = false; 308 unsigned int i, vlen; 309 void *value = NULL; 310 const char *name; 311 struct btf *btf; 312 int err; 313 314 if (!num_maps) 315 return; 316 317 memset(&map_info, 0, sizeof(map_info)); 318 value = find_metadata(fd, &map_info); 319 if (!value) 320 return; 321 322 btf = btf__load_from_kernel_by_id(map_info.btf_id); 323 if (libbpf_get_error(btf)) 324 goto out_free; 325 326 t_datasec = btf__type_by_id(btf, map_info.btf_value_type_id); 327 if (!btf_is_datasec(t_datasec)) 328 goto out_free; 329 330 vlen = btf_vlen(t_datasec); 331 vsi = btf_var_secinfos(t_datasec); 332 333 /* We don't proceed to check the kinds of the elements of the DATASEC. 334 * The verifier enforces them to be BTF_KIND_VAR. 335 */ 336 337 if (json_output) { 338 struct btf_dumper d = { 339 .btf = btf, 340 .jw = json_wtr, 341 .is_plain_text = false, 342 }; 343 344 for (i = 0; i < vlen; i++, vsi++) { 345 t_var = btf__type_by_id(btf, vsi->type); 346 name = btf__name_by_offset(btf, t_var->name_off); 347 348 if (!has_metadata_prefix(name)) 349 continue; 350 351 if (!printed_header) { 352 jsonw_name(json_wtr, "metadata"); 353 jsonw_start_object(json_wtr); 354 printed_header = true; 355 } 356 357 jsonw_name(json_wtr, name + BPF_METADATA_PREFIX_LEN); 358 err = btf_dumper_type(&d, t_var->type, value + vsi->offset); 359 if (err) { 360 p_err("btf dump failed: %d", err); 361 break; 362 } 363 } 364 if (printed_header) 365 jsonw_end_object(json_wtr); 366 } else { 367 json_writer_t *btf_wtr; 368 struct btf_dumper d = { 369 .btf = btf, 370 .is_plain_text = true, 371 }; 372 373 for (i = 0; i < vlen; i++, vsi++) { 374 t_var = btf__type_by_id(btf, vsi->type); 375 name = btf__name_by_offset(btf, t_var->name_off); 376 377 if (!has_metadata_prefix(name)) 378 continue; 379 380 if (!printed_header) { 381 printf("\tmetadata:"); 382 383 btf_wtr = jsonw_new(stdout); 384 if (!btf_wtr) { 385 p_err("jsonw alloc failed"); 386 goto out_free; 387 } 388 d.jw = btf_wtr, 389 390 printed_header = true; 391 } 392 393 printf("\n\t\t%s = ", name + BPF_METADATA_PREFIX_LEN); 394 395 jsonw_reset(btf_wtr); 396 err = btf_dumper_type(&d, t_var->type, value + vsi->offset); 397 if (err) { 398 p_err("btf dump failed: %d", err); 399 break; 400 } 401 } 402 if (printed_header) 403 jsonw_destroy(&btf_wtr); 404 } 405 406 out_free: 407 btf__free(btf); 408 free(value); 409 } 410 411 static void print_prog_header_json(struct bpf_prog_info *info, int fd) 412 { 413 const char *prog_type_str; 414 char prog_name[MAX_PROG_FULL_NAME]; 415 416 jsonw_uint_field(json_wtr, "id", info->id); 417 prog_type_str = libbpf_bpf_prog_type_str(info->type); 418 419 if (prog_type_str) 420 jsonw_string_field(json_wtr, "type", prog_type_str); 421 else 422 jsonw_uint_field(json_wtr, "type", info->type); 423 424 if (*info->name) { 425 get_prog_full_name(info, fd, prog_name, sizeof(prog_name)); 426 jsonw_string_field(json_wtr, "name", prog_name); 427 } 428 429 jsonw_name(json_wtr, "tag"); 430 jsonw_printf(json_wtr, "\"" BPF_TAG_FMT "\"", 431 info->tag[0], info->tag[1], info->tag[2], info->tag[3], 432 info->tag[4], info->tag[5], info->tag[6], info->tag[7]); 433 434 jsonw_bool_field(json_wtr, "gpl_compatible", info->gpl_compatible); 435 if (info->run_time_ns) { 436 jsonw_uint_field(json_wtr, "run_time_ns", info->run_time_ns); 437 jsonw_uint_field(json_wtr, "run_cnt", info->run_cnt); 438 } 439 if (info->recursion_misses) 440 jsonw_uint_field(json_wtr, "recursion_misses", info->recursion_misses); 441 } 442 443 static void print_prog_json(struct bpf_prog_info *info, int fd) 444 { 445 char *memlock; 446 447 jsonw_start_object(json_wtr); 448 print_prog_header_json(info, fd); 449 print_dev_json(info->ifindex, info->netns_dev, info->netns_ino); 450 451 if (info->load_time) { 452 char buf[32]; 453 454 print_boot_time(info->load_time, buf, sizeof(buf)); 455 456 /* Piggy back on load_time, since 0 uid is a valid one */ 457 jsonw_name(json_wtr, "loaded_at"); 458 jsonw_printf(json_wtr, "%s", buf); 459 jsonw_uint_field(json_wtr, "uid", info->created_by_uid); 460 } 461 462 jsonw_uint_field(json_wtr, "bytes_xlated", info->xlated_prog_len); 463 464 if (info->jited_prog_len) { 465 jsonw_bool_field(json_wtr, "jited", true); 466 jsonw_uint_field(json_wtr, "bytes_jited", info->jited_prog_len); 467 } else { 468 jsonw_bool_field(json_wtr, "jited", false); 469 } 470 471 memlock = get_fdinfo(fd, "memlock"); 472 if (memlock) 473 jsonw_int_field(json_wtr, "bytes_memlock", atoll(memlock)); 474 free(memlock); 475 476 if (info->nr_map_ids) 477 show_prog_maps(fd, info->nr_map_ids); 478 479 if (info->btf_id) 480 jsonw_int_field(json_wtr, "btf_id", info->btf_id); 481 482 if (!hashmap__empty(prog_table)) { 483 struct hashmap_entry *entry; 484 485 jsonw_name(json_wtr, "pinned"); 486 jsonw_start_array(json_wtr); 487 hashmap__for_each_key_entry(prog_table, entry, 488 u32_as_hash_field(info->id)) 489 jsonw_string(json_wtr, entry->value); 490 jsonw_end_array(json_wtr); 491 } 492 493 emit_obj_refs_json(refs_table, info->id, json_wtr); 494 495 show_prog_metadata(fd, info->nr_map_ids); 496 497 jsonw_end_object(json_wtr); 498 } 499 500 static void print_prog_header_plain(struct bpf_prog_info *info, int fd) 501 { 502 const char *prog_type_str; 503 char prog_name[MAX_PROG_FULL_NAME]; 504 505 printf("%u: ", info->id); 506 prog_type_str = libbpf_bpf_prog_type_str(info->type); 507 if (prog_type_str) 508 printf("%s ", prog_type_str); 509 else 510 printf("type %u ", info->type); 511 512 if (*info->name) { 513 get_prog_full_name(info, fd, prog_name, sizeof(prog_name)); 514 printf("name %s ", prog_name); 515 } 516 517 printf("tag "); 518 fprint_hex(stdout, info->tag, BPF_TAG_SIZE, ""); 519 print_dev_plain(info->ifindex, info->netns_dev, info->netns_ino); 520 printf("%s", info->gpl_compatible ? " gpl" : ""); 521 if (info->run_time_ns) 522 printf(" run_time_ns %lld run_cnt %lld", 523 info->run_time_ns, info->run_cnt); 524 if (info->recursion_misses) 525 printf(" recursion_misses %lld", info->recursion_misses); 526 printf("\n"); 527 } 528 529 static void print_prog_plain(struct bpf_prog_info *info, int fd) 530 { 531 char *memlock; 532 533 print_prog_header_plain(info, fd); 534 535 if (info->load_time) { 536 char buf[32]; 537 538 print_boot_time(info->load_time, buf, sizeof(buf)); 539 540 /* Piggy back on load_time, since 0 uid is a valid one */ 541 printf("\tloaded_at %s uid %u\n", buf, info->created_by_uid); 542 } 543 544 printf("\txlated %uB", info->xlated_prog_len); 545 546 if (info->jited_prog_len) 547 printf(" jited %uB", info->jited_prog_len); 548 else 549 printf(" not jited"); 550 551 memlock = get_fdinfo(fd, "memlock"); 552 if (memlock) 553 printf(" memlock %sB", memlock); 554 free(memlock); 555 556 if (info->nr_map_ids) 557 show_prog_maps(fd, info->nr_map_ids); 558 559 if (!hashmap__empty(prog_table)) { 560 struct hashmap_entry *entry; 561 562 hashmap__for_each_key_entry(prog_table, entry, 563 u32_as_hash_field(info->id)) 564 printf("\n\tpinned %s", (char *)entry->value); 565 } 566 567 if (info->btf_id) 568 printf("\n\tbtf_id %d", info->btf_id); 569 570 emit_obj_refs_plain(refs_table, info->id, "\n\tpids "); 571 572 printf("\n"); 573 574 show_prog_metadata(fd, info->nr_map_ids); 575 } 576 577 static int show_prog(int fd) 578 { 579 struct bpf_prog_info info = {}; 580 __u32 len = sizeof(info); 581 int err; 582 583 err = bpf_obj_get_info_by_fd(fd, &info, &len); 584 if (err) { 585 p_err("can't get prog info: %s", strerror(errno)); 586 return -1; 587 } 588 589 if (json_output) 590 print_prog_json(&info, fd); 591 else 592 print_prog_plain(&info, fd); 593 594 return 0; 595 } 596 597 static int do_show_subset(int argc, char **argv) 598 { 599 int *fds = NULL; 600 int nb_fds, i; 601 int err = -1; 602 603 fds = malloc(sizeof(int)); 604 if (!fds) { 605 p_err("mem alloc failed"); 606 return -1; 607 } 608 nb_fds = prog_parse_fds(&argc, &argv, &fds); 609 if (nb_fds < 1) 610 goto exit_free; 611 612 if (json_output && nb_fds > 1) 613 jsonw_start_array(json_wtr); /* root array */ 614 for (i = 0; i < nb_fds; i++) { 615 err = show_prog(fds[i]); 616 if (err) { 617 for (; i < nb_fds; i++) 618 close(fds[i]); 619 break; 620 } 621 close(fds[i]); 622 } 623 if (json_output && nb_fds > 1) 624 jsonw_end_array(json_wtr); /* root array */ 625 626 exit_free: 627 free(fds); 628 return err; 629 } 630 631 static int do_show(int argc, char **argv) 632 { 633 __u32 id = 0; 634 int err; 635 int fd; 636 637 if (show_pinned) { 638 prog_table = hashmap__new(hash_fn_for_key_as_id, 639 equal_fn_for_key_as_id, NULL); 640 if (IS_ERR(prog_table)) { 641 p_err("failed to create hashmap for pinned paths"); 642 return -1; 643 } 644 build_pinned_obj_table(prog_table, BPF_OBJ_PROG); 645 } 646 build_obj_refs_table(&refs_table, BPF_OBJ_PROG); 647 648 if (argc == 2) 649 return do_show_subset(argc, argv); 650 651 if (argc) 652 return BAD_ARG(); 653 654 if (json_output) 655 jsonw_start_array(json_wtr); 656 while (true) { 657 err = bpf_prog_get_next_id(id, &id); 658 if (err) { 659 if (errno == ENOENT) { 660 err = 0; 661 break; 662 } 663 p_err("can't get next program: %s%s", strerror(errno), 664 errno == EINVAL ? " -- kernel too old?" : ""); 665 err = -1; 666 break; 667 } 668 669 fd = bpf_prog_get_fd_by_id(id); 670 if (fd < 0) { 671 if (errno == ENOENT) 672 continue; 673 p_err("can't get prog by id (%u): %s", 674 id, strerror(errno)); 675 err = -1; 676 break; 677 } 678 679 err = show_prog(fd); 680 close(fd); 681 if (err) 682 break; 683 } 684 685 if (json_output) 686 jsonw_end_array(json_wtr); 687 688 delete_obj_refs_table(refs_table); 689 690 if (show_pinned) 691 delete_pinned_obj_table(prog_table); 692 693 return err; 694 } 695 696 static int 697 prog_dump(struct bpf_prog_info *info, enum dump_mode mode, 698 char *filepath, bool opcodes, bool visual, bool linum) 699 { 700 struct bpf_prog_linfo *prog_linfo = NULL; 701 const char *disasm_opt = NULL; 702 struct dump_data dd = {}; 703 void *func_info = NULL; 704 struct btf *btf = NULL; 705 char func_sig[1024]; 706 unsigned char *buf; 707 __u32 member_len; 708 int fd, err = -1; 709 ssize_t n; 710 711 if (mode == DUMP_JITED) { 712 if (info->jited_prog_len == 0 || !info->jited_prog_insns) { 713 p_info("no instructions returned"); 714 return -1; 715 } 716 buf = u64_to_ptr(info->jited_prog_insns); 717 member_len = info->jited_prog_len; 718 } else { /* DUMP_XLATED */ 719 if (info->xlated_prog_len == 0 || !info->xlated_prog_insns) { 720 p_err("error retrieving insn dump: kernel.kptr_restrict set?"); 721 return -1; 722 } 723 buf = u64_to_ptr(info->xlated_prog_insns); 724 member_len = info->xlated_prog_len; 725 } 726 727 if (info->btf_id) { 728 btf = btf__load_from_kernel_by_id(info->btf_id); 729 if (libbpf_get_error(btf)) { 730 p_err("failed to get btf"); 731 return -1; 732 } 733 } 734 735 func_info = u64_to_ptr(info->func_info); 736 737 if (info->nr_line_info) { 738 prog_linfo = bpf_prog_linfo__new(info); 739 if (!prog_linfo) 740 p_info("error in processing bpf_line_info. continue without it."); 741 } 742 743 if (filepath) { 744 fd = open(filepath, O_WRONLY | O_CREAT | O_TRUNC, 0600); 745 if (fd < 0) { 746 p_err("can't open file %s: %s", filepath, 747 strerror(errno)); 748 goto exit_free; 749 } 750 751 n = write(fd, buf, member_len); 752 close(fd); 753 if (n != (ssize_t)member_len) { 754 p_err("error writing output file: %s", 755 n < 0 ? strerror(errno) : "short write"); 756 goto exit_free; 757 } 758 759 if (json_output) 760 jsonw_null(json_wtr); 761 } else if (mode == DUMP_JITED) { 762 const char *name = NULL; 763 764 if (info->ifindex) { 765 name = ifindex_to_bfd_params(info->ifindex, 766 info->netns_dev, 767 info->netns_ino, 768 &disasm_opt); 769 if (!name) 770 goto exit_free; 771 } 772 773 if (info->nr_jited_func_lens && info->jited_func_lens) { 774 struct kernel_sym *sym = NULL; 775 struct bpf_func_info *record; 776 char sym_name[SYM_MAX_NAME]; 777 unsigned char *img = buf; 778 __u64 *ksyms = NULL; 779 __u32 *lens; 780 __u32 i; 781 if (info->nr_jited_ksyms) { 782 kernel_syms_load(&dd); 783 ksyms = u64_to_ptr(info->jited_ksyms); 784 } 785 786 if (json_output) 787 jsonw_start_array(json_wtr); 788 789 lens = u64_to_ptr(info->jited_func_lens); 790 for (i = 0; i < info->nr_jited_func_lens; i++) { 791 if (ksyms) { 792 sym = kernel_syms_search(&dd, ksyms[i]); 793 if (sym) 794 sprintf(sym_name, "%s", sym->name); 795 else 796 sprintf(sym_name, "0x%016llx", ksyms[i]); 797 } else { 798 strcpy(sym_name, "unknown"); 799 } 800 801 if (func_info) { 802 record = func_info + i * info->func_info_rec_size; 803 btf_dumper_type_only(btf, record->type_id, 804 func_sig, 805 sizeof(func_sig)); 806 } 807 808 if (json_output) { 809 jsonw_start_object(json_wtr); 810 if (func_info && func_sig[0] != '\0') { 811 jsonw_name(json_wtr, "proto"); 812 jsonw_string(json_wtr, func_sig); 813 } 814 jsonw_name(json_wtr, "name"); 815 jsonw_string(json_wtr, sym_name); 816 jsonw_name(json_wtr, "insns"); 817 } else { 818 if (func_info && func_sig[0] != '\0') 819 printf("%s:\n", func_sig); 820 printf("%s:\n", sym_name); 821 } 822 823 disasm_print_insn(img, lens[i], opcodes, 824 name, disasm_opt, btf, 825 prog_linfo, ksyms[i], i, 826 linum); 827 828 img += lens[i]; 829 830 if (json_output) 831 jsonw_end_object(json_wtr); 832 else 833 printf("\n"); 834 } 835 836 if (json_output) 837 jsonw_end_array(json_wtr); 838 } else { 839 disasm_print_insn(buf, member_len, opcodes, name, 840 disasm_opt, btf, NULL, 0, 0, false); 841 } 842 } else if (visual) { 843 if (json_output) 844 jsonw_null(json_wtr); 845 else 846 dump_xlated_cfg(buf, member_len); 847 } else { 848 kernel_syms_load(&dd); 849 dd.nr_jited_ksyms = info->nr_jited_ksyms; 850 dd.jited_ksyms = u64_to_ptr(info->jited_ksyms); 851 dd.btf = btf; 852 dd.func_info = func_info; 853 dd.finfo_rec_size = info->func_info_rec_size; 854 dd.prog_linfo = prog_linfo; 855 856 if (json_output) 857 dump_xlated_json(&dd, buf, member_len, opcodes, 858 linum); 859 else 860 dump_xlated_plain(&dd, buf, member_len, opcodes, 861 linum); 862 kernel_syms_destroy(&dd); 863 } 864 865 err = 0; 866 867 exit_free: 868 btf__free(btf); 869 bpf_prog_linfo__free(prog_linfo); 870 return err; 871 } 872 873 static int do_dump(int argc, char **argv) 874 { 875 struct bpf_prog_info info; 876 __u32 info_len = sizeof(info); 877 size_t info_data_sz = 0; 878 void *info_data = NULL; 879 char *filepath = NULL; 880 bool opcodes = false; 881 bool visual = false; 882 enum dump_mode mode; 883 bool linum = false; 884 int nb_fds, i = 0; 885 int *fds = NULL; 886 int err = -1; 887 888 if (is_prefix(*argv, "jited")) { 889 if (disasm_init()) 890 return -1; 891 mode = DUMP_JITED; 892 } else if (is_prefix(*argv, "xlated")) { 893 mode = DUMP_XLATED; 894 } else { 895 p_err("expected 'xlated' or 'jited', got: %s", *argv); 896 return -1; 897 } 898 NEXT_ARG(); 899 900 if (argc < 2) 901 usage(); 902 903 fds = malloc(sizeof(int)); 904 if (!fds) { 905 p_err("mem alloc failed"); 906 return -1; 907 } 908 nb_fds = prog_parse_fds(&argc, &argv, &fds); 909 if (nb_fds < 1) 910 goto exit_free; 911 912 if (is_prefix(*argv, "file")) { 913 NEXT_ARG(); 914 if (!argc) { 915 p_err("expected file path"); 916 goto exit_close; 917 } 918 if (nb_fds > 1) { 919 p_err("several programs matched"); 920 goto exit_close; 921 } 922 923 filepath = *argv; 924 NEXT_ARG(); 925 } else if (is_prefix(*argv, "opcodes")) { 926 opcodes = true; 927 NEXT_ARG(); 928 } else if (is_prefix(*argv, "visual")) { 929 if (nb_fds > 1) { 930 p_err("several programs matched"); 931 goto exit_close; 932 } 933 934 visual = true; 935 NEXT_ARG(); 936 } else if (is_prefix(*argv, "linum")) { 937 linum = true; 938 NEXT_ARG(); 939 } 940 941 if (argc) { 942 usage(); 943 goto exit_close; 944 } 945 946 if (json_output && nb_fds > 1) 947 jsonw_start_array(json_wtr); /* root array */ 948 for (i = 0; i < nb_fds; i++) { 949 memset(&info, 0, sizeof(info)); 950 951 err = bpf_obj_get_info_by_fd(fds[i], &info, &info_len); 952 if (err) { 953 p_err("can't get prog info: %s", strerror(errno)); 954 break; 955 } 956 957 err = prep_prog_info(&info, mode, &info_data, &info_data_sz); 958 if (err) { 959 p_err("can't grow prog info_data"); 960 break; 961 } 962 963 err = bpf_obj_get_info_by_fd(fds[i], &info, &info_len); 964 if (err) { 965 p_err("can't get prog info: %s", strerror(errno)); 966 break; 967 } 968 969 if (json_output && nb_fds > 1) { 970 jsonw_start_object(json_wtr); /* prog object */ 971 print_prog_header_json(&info, fds[i]); 972 jsonw_name(json_wtr, "insns"); 973 } else if (nb_fds > 1) { 974 print_prog_header_plain(&info, fds[i]); 975 } 976 977 err = prog_dump(&info, mode, filepath, opcodes, visual, linum); 978 979 if (json_output && nb_fds > 1) 980 jsonw_end_object(json_wtr); /* prog object */ 981 else if (i != nb_fds - 1 && nb_fds > 1) 982 printf("\n"); 983 984 if (err) 985 break; 986 close(fds[i]); 987 } 988 if (json_output && nb_fds > 1) 989 jsonw_end_array(json_wtr); /* root array */ 990 991 exit_close: 992 for (; i < nb_fds; i++) 993 close(fds[i]); 994 exit_free: 995 free(info_data); 996 free(fds); 997 return err; 998 } 999 1000 static int do_pin(int argc, char **argv) 1001 { 1002 int err; 1003 1004 err = do_pin_any(argc, argv, prog_parse_fd); 1005 if (!err && json_output) 1006 jsonw_null(json_wtr); 1007 return err; 1008 } 1009 1010 struct map_replace { 1011 int idx; 1012 int fd; 1013 char *name; 1014 }; 1015 1016 static int map_replace_compar(const void *p1, const void *p2) 1017 { 1018 const struct map_replace *a = p1, *b = p2; 1019 1020 return a->idx - b->idx; 1021 } 1022 1023 static int parse_attach_detach_args(int argc, char **argv, int *progfd, 1024 enum bpf_attach_type *attach_type, 1025 int *mapfd) 1026 { 1027 if (!REQ_ARGS(3)) 1028 return -EINVAL; 1029 1030 *progfd = prog_parse_fd(&argc, &argv); 1031 if (*progfd < 0) 1032 return *progfd; 1033 1034 *attach_type = parse_attach_type(*argv); 1035 if (*attach_type == __MAX_BPF_ATTACH_TYPE) { 1036 p_err("invalid attach/detach type"); 1037 return -EINVAL; 1038 } 1039 1040 if (*attach_type == BPF_FLOW_DISSECTOR) { 1041 *mapfd = 0; 1042 return 0; 1043 } 1044 1045 NEXT_ARG(); 1046 if (!REQ_ARGS(2)) 1047 return -EINVAL; 1048 1049 *mapfd = map_parse_fd(&argc, &argv); 1050 if (*mapfd < 0) 1051 return *mapfd; 1052 1053 return 0; 1054 } 1055 1056 static int do_attach(int argc, char **argv) 1057 { 1058 enum bpf_attach_type attach_type; 1059 int err, progfd; 1060 int mapfd; 1061 1062 err = parse_attach_detach_args(argc, argv, 1063 &progfd, &attach_type, &mapfd); 1064 if (err) 1065 return err; 1066 1067 err = bpf_prog_attach(progfd, mapfd, attach_type, 0); 1068 if (err) { 1069 p_err("failed prog attach to map"); 1070 return -EINVAL; 1071 } 1072 1073 if (json_output) 1074 jsonw_null(json_wtr); 1075 return 0; 1076 } 1077 1078 static int do_detach(int argc, char **argv) 1079 { 1080 enum bpf_attach_type attach_type; 1081 int err, progfd; 1082 int mapfd; 1083 1084 err = parse_attach_detach_args(argc, argv, 1085 &progfd, &attach_type, &mapfd); 1086 if (err) 1087 return err; 1088 1089 err = bpf_prog_detach2(progfd, mapfd, attach_type); 1090 if (err) { 1091 p_err("failed prog detach from map"); 1092 return -EINVAL; 1093 } 1094 1095 if (json_output) 1096 jsonw_null(json_wtr); 1097 return 0; 1098 } 1099 1100 static int check_single_stdin(char *file_data_in, char *file_ctx_in) 1101 { 1102 if (file_data_in && file_ctx_in && 1103 !strcmp(file_data_in, "-") && !strcmp(file_ctx_in, "-")) { 1104 p_err("cannot use standard input for both data_in and ctx_in"); 1105 return -1; 1106 } 1107 1108 return 0; 1109 } 1110 1111 static int get_run_data(const char *fname, void **data_ptr, unsigned int *size) 1112 { 1113 size_t block_size = 256; 1114 size_t buf_size = block_size; 1115 size_t nb_read = 0; 1116 void *tmp; 1117 FILE *f; 1118 1119 if (!fname) { 1120 *data_ptr = NULL; 1121 *size = 0; 1122 return 0; 1123 } 1124 1125 if (!strcmp(fname, "-")) 1126 f = stdin; 1127 else 1128 f = fopen(fname, "r"); 1129 if (!f) { 1130 p_err("failed to open %s: %s", fname, strerror(errno)); 1131 return -1; 1132 } 1133 1134 *data_ptr = malloc(block_size); 1135 if (!*data_ptr) { 1136 p_err("failed to allocate memory for data_in/ctx_in: %s", 1137 strerror(errno)); 1138 goto err_fclose; 1139 } 1140 1141 while ((nb_read += fread(*data_ptr + nb_read, 1, block_size, f))) { 1142 if (feof(f)) 1143 break; 1144 if (ferror(f)) { 1145 p_err("failed to read data_in/ctx_in from %s: %s", 1146 fname, strerror(errno)); 1147 goto err_free; 1148 } 1149 if (nb_read > buf_size - block_size) { 1150 if (buf_size == UINT32_MAX) { 1151 p_err("data_in/ctx_in is too long (max: %d)", 1152 UINT32_MAX); 1153 goto err_free; 1154 } 1155 /* No space for fread()-ing next chunk; realloc() */ 1156 buf_size *= 2; 1157 tmp = realloc(*data_ptr, buf_size); 1158 if (!tmp) { 1159 p_err("failed to reallocate data_in/ctx_in: %s", 1160 strerror(errno)); 1161 goto err_free; 1162 } 1163 *data_ptr = tmp; 1164 } 1165 } 1166 if (f != stdin) 1167 fclose(f); 1168 1169 *size = nb_read; 1170 return 0; 1171 1172 err_free: 1173 free(*data_ptr); 1174 *data_ptr = NULL; 1175 err_fclose: 1176 if (f != stdin) 1177 fclose(f); 1178 return -1; 1179 } 1180 1181 static void hex_print(void *data, unsigned int size, FILE *f) 1182 { 1183 size_t i, j; 1184 char c; 1185 1186 for (i = 0; i < size; i += 16) { 1187 /* Row offset */ 1188 fprintf(f, "%07zx\t", i); 1189 1190 /* Hexadecimal values */ 1191 for (j = i; j < i + 16 && j < size; j++) 1192 fprintf(f, "%02x%s", *(uint8_t *)(data + j), 1193 j % 2 ? " " : ""); 1194 for (; j < i + 16; j++) 1195 fprintf(f, " %s", j % 2 ? " " : ""); 1196 1197 /* ASCII values (if relevant), '.' otherwise */ 1198 fprintf(f, "| "); 1199 for (j = i; j < i + 16 && j < size; j++) { 1200 c = *(char *)(data + j); 1201 if (c < ' ' || c > '~') 1202 c = '.'; 1203 fprintf(f, "%c%s", c, j == i + 7 ? " " : ""); 1204 } 1205 1206 fprintf(f, "\n"); 1207 } 1208 } 1209 1210 static int 1211 print_run_output(void *data, unsigned int size, const char *fname, 1212 const char *json_key) 1213 { 1214 size_t nb_written; 1215 FILE *f; 1216 1217 if (!fname) 1218 return 0; 1219 1220 if (!strcmp(fname, "-")) { 1221 f = stdout; 1222 if (json_output) { 1223 jsonw_name(json_wtr, json_key); 1224 print_data_json(data, size); 1225 } else { 1226 hex_print(data, size, f); 1227 } 1228 return 0; 1229 } 1230 1231 f = fopen(fname, "w"); 1232 if (!f) { 1233 p_err("failed to open %s: %s", fname, strerror(errno)); 1234 return -1; 1235 } 1236 1237 nb_written = fwrite(data, 1, size, f); 1238 fclose(f); 1239 if (nb_written != size) { 1240 p_err("failed to write output data/ctx: %s", strerror(errno)); 1241 return -1; 1242 } 1243 1244 return 0; 1245 } 1246 1247 static int alloc_run_data(void **data_ptr, unsigned int size_out) 1248 { 1249 *data_ptr = calloc(size_out, 1); 1250 if (!*data_ptr) { 1251 p_err("failed to allocate memory for output data/ctx: %s", 1252 strerror(errno)); 1253 return -1; 1254 } 1255 1256 return 0; 1257 } 1258 1259 static int do_run(int argc, char **argv) 1260 { 1261 char *data_fname_in = NULL, *data_fname_out = NULL; 1262 char *ctx_fname_in = NULL, *ctx_fname_out = NULL; 1263 const unsigned int default_size = SZ_32K; 1264 void *data_in = NULL, *data_out = NULL; 1265 void *ctx_in = NULL, *ctx_out = NULL; 1266 unsigned int repeat = 1; 1267 int fd, err; 1268 LIBBPF_OPTS(bpf_test_run_opts, test_attr); 1269 1270 if (!REQ_ARGS(4)) 1271 return -1; 1272 1273 fd = prog_parse_fd(&argc, &argv); 1274 if (fd < 0) 1275 return -1; 1276 1277 while (argc) { 1278 if (detect_common_prefix(*argv, "data_in", "data_out", 1279 "data_size_out", NULL)) 1280 return -1; 1281 if (detect_common_prefix(*argv, "ctx_in", "ctx_out", 1282 "ctx_size_out", NULL)) 1283 return -1; 1284 1285 if (is_prefix(*argv, "data_in")) { 1286 NEXT_ARG(); 1287 if (!REQ_ARGS(1)) 1288 return -1; 1289 1290 data_fname_in = GET_ARG(); 1291 if (check_single_stdin(data_fname_in, ctx_fname_in)) 1292 return -1; 1293 } else if (is_prefix(*argv, "data_out")) { 1294 NEXT_ARG(); 1295 if (!REQ_ARGS(1)) 1296 return -1; 1297 1298 data_fname_out = GET_ARG(); 1299 } else if (is_prefix(*argv, "data_size_out")) { 1300 char *endptr; 1301 1302 NEXT_ARG(); 1303 if (!REQ_ARGS(1)) 1304 return -1; 1305 1306 test_attr.data_size_out = strtoul(*argv, &endptr, 0); 1307 if (*endptr) { 1308 p_err("can't parse %s as output data size", 1309 *argv); 1310 return -1; 1311 } 1312 NEXT_ARG(); 1313 } else if (is_prefix(*argv, "ctx_in")) { 1314 NEXT_ARG(); 1315 if (!REQ_ARGS(1)) 1316 return -1; 1317 1318 ctx_fname_in = GET_ARG(); 1319 if (check_single_stdin(data_fname_in, ctx_fname_in)) 1320 return -1; 1321 } else if (is_prefix(*argv, "ctx_out")) { 1322 NEXT_ARG(); 1323 if (!REQ_ARGS(1)) 1324 return -1; 1325 1326 ctx_fname_out = GET_ARG(); 1327 } else if (is_prefix(*argv, "ctx_size_out")) { 1328 char *endptr; 1329 1330 NEXT_ARG(); 1331 if (!REQ_ARGS(1)) 1332 return -1; 1333 1334 test_attr.ctx_size_out = strtoul(*argv, &endptr, 0); 1335 if (*endptr) { 1336 p_err("can't parse %s as output context size", 1337 *argv); 1338 return -1; 1339 } 1340 NEXT_ARG(); 1341 } else if (is_prefix(*argv, "repeat")) { 1342 char *endptr; 1343 1344 NEXT_ARG(); 1345 if (!REQ_ARGS(1)) 1346 return -1; 1347 1348 repeat = strtoul(*argv, &endptr, 0); 1349 if (*endptr) { 1350 p_err("can't parse %s as repeat number", 1351 *argv); 1352 return -1; 1353 } 1354 NEXT_ARG(); 1355 } else { 1356 p_err("expected no more arguments, 'data_in', 'data_out', 'data_size_out', 'ctx_in', 'ctx_out', 'ctx_size_out' or 'repeat', got: '%s'?", 1357 *argv); 1358 return -1; 1359 } 1360 } 1361 1362 err = get_run_data(data_fname_in, &data_in, &test_attr.data_size_in); 1363 if (err) 1364 return -1; 1365 1366 if (data_in) { 1367 if (!test_attr.data_size_out) 1368 test_attr.data_size_out = default_size; 1369 err = alloc_run_data(&data_out, test_attr.data_size_out); 1370 if (err) 1371 goto free_data_in; 1372 } 1373 1374 err = get_run_data(ctx_fname_in, &ctx_in, &test_attr.ctx_size_in); 1375 if (err) 1376 goto free_data_out; 1377 1378 if (ctx_in) { 1379 if (!test_attr.ctx_size_out) 1380 test_attr.ctx_size_out = default_size; 1381 err = alloc_run_data(&ctx_out, test_attr.ctx_size_out); 1382 if (err) 1383 goto free_ctx_in; 1384 } 1385 1386 test_attr.repeat = repeat; 1387 test_attr.data_in = data_in; 1388 test_attr.data_out = data_out; 1389 test_attr.ctx_in = ctx_in; 1390 test_attr.ctx_out = ctx_out; 1391 1392 err = bpf_prog_test_run_opts(fd, &test_attr); 1393 if (err) { 1394 p_err("failed to run program: %s", strerror(errno)); 1395 goto free_ctx_out; 1396 } 1397 1398 err = 0; 1399 1400 if (json_output) 1401 jsonw_start_object(json_wtr); /* root */ 1402 1403 /* Do not exit on errors occurring when printing output data/context, 1404 * we still want to print return value and duration for program run. 1405 */ 1406 if (test_attr.data_size_out) 1407 err += print_run_output(test_attr.data_out, 1408 test_attr.data_size_out, 1409 data_fname_out, "data_out"); 1410 if (test_attr.ctx_size_out) 1411 err += print_run_output(test_attr.ctx_out, 1412 test_attr.ctx_size_out, 1413 ctx_fname_out, "ctx_out"); 1414 1415 if (json_output) { 1416 jsonw_uint_field(json_wtr, "retval", test_attr.retval); 1417 jsonw_uint_field(json_wtr, "duration", test_attr.duration); 1418 jsonw_end_object(json_wtr); /* root */ 1419 } else { 1420 fprintf(stdout, "Return value: %u, duration%s: %uns\n", 1421 test_attr.retval, 1422 repeat > 1 ? " (average)" : "", test_attr.duration); 1423 } 1424 1425 free_ctx_out: 1426 free(ctx_out); 1427 free_ctx_in: 1428 free(ctx_in); 1429 free_data_out: 1430 free(data_out); 1431 free_data_in: 1432 free(data_in); 1433 1434 return err; 1435 } 1436 1437 static int 1438 get_prog_type_by_name(const char *name, enum bpf_prog_type *prog_type, 1439 enum bpf_attach_type *expected_attach_type) 1440 { 1441 libbpf_print_fn_t print_backup; 1442 int ret; 1443 1444 ret = libbpf_prog_type_by_name(name, prog_type, expected_attach_type); 1445 if (!ret) 1446 return ret; 1447 1448 /* libbpf_prog_type_by_name() failed, let's re-run with debug level */ 1449 print_backup = libbpf_set_print(print_all_levels); 1450 ret = libbpf_prog_type_by_name(name, prog_type, expected_attach_type); 1451 libbpf_set_print(print_backup); 1452 1453 return ret; 1454 } 1455 1456 static int 1457 auto_attach_program(struct bpf_program *prog, const char *path) 1458 { 1459 struct bpf_link *link; 1460 int err; 1461 1462 link = bpf_program__attach(prog); 1463 if (!link) { 1464 p_info("Program %s does not support autoattach, falling back to pinning", 1465 bpf_program__name(prog)); 1466 return bpf_obj_pin(bpf_program__fd(prog), path); 1467 } 1468 1469 err = bpf_link__pin(link, path); 1470 bpf_link__destroy(link); 1471 return err; 1472 } 1473 1474 static int pathname_concat(char *buf, size_t buf_sz, const char *path, const char *name) 1475 { 1476 int len; 1477 1478 len = snprintf(buf, buf_sz, "%s/%s", path, name); 1479 if (len < 0) 1480 return -EINVAL; 1481 if ((size_t)len >= buf_sz) 1482 return -ENAMETOOLONG; 1483 1484 return 0; 1485 } 1486 1487 static int 1488 auto_attach_programs(struct bpf_object *obj, const char *path) 1489 { 1490 struct bpf_program *prog; 1491 char buf[PATH_MAX]; 1492 int err; 1493 1494 bpf_object__for_each_program(prog, obj) { 1495 err = pathname_concat(buf, sizeof(buf), path, bpf_program__name(prog)); 1496 if (err) 1497 goto err_unpin_programs; 1498 1499 err = auto_attach_program(prog, buf); 1500 if (err) 1501 goto err_unpin_programs; 1502 } 1503 1504 return 0; 1505 1506 err_unpin_programs: 1507 while ((prog = bpf_object__prev_program(obj, prog))) { 1508 if (pathname_concat(buf, sizeof(buf), path, bpf_program__name(prog))) 1509 continue; 1510 1511 bpf_program__unpin(prog, buf); 1512 } 1513 1514 return err; 1515 } 1516 1517 static int load_with_options(int argc, char **argv, bool first_prog_only) 1518 { 1519 enum bpf_prog_type common_prog_type = BPF_PROG_TYPE_UNSPEC; 1520 DECLARE_LIBBPF_OPTS(bpf_object_open_opts, open_opts, 1521 .relaxed_maps = relaxed_maps, 1522 ); 1523 enum bpf_attach_type expected_attach_type; 1524 struct map_replace *map_replace = NULL; 1525 struct bpf_program *prog = NULL, *pos; 1526 unsigned int old_map_fds = 0; 1527 const char *pinmaps = NULL; 1528 bool auto_attach = false; 1529 struct bpf_object *obj; 1530 struct bpf_map *map; 1531 const char *pinfile; 1532 unsigned int i, j; 1533 __u32 ifindex = 0; 1534 const char *file; 1535 int idx, err; 1536 1537 1538 if (!REQ_ARGS(2)) 1539 return -1; 1540 file = GET_ARG(); 1541 pinfile = GET_ARG(); 1542 1543 while (argc) { 1544 if (is_prefix(*argv, "type")) { 1545 NEXT_ARG(); 1546 1547 if (common_prog_type != BPF_PROG_TYPE_UNSPEC) { 1548 p_err("program type already specified"); 1549 goto err_free_reuse_maps; 1550 } 1551 if (!REQ_ARGS(1)) 1552 goto err_free_reuse_maps; 1553 1554 err = libbpf_prog_type_by_name(*argv, &common_prog_type, 1555 &expected_attach_type); 1556 if (err < 0) { 1557 /* Put a '/' at the end of type to appease libbpf */ 1558 char *type = malloc(strlen(*argv) + 2); 1559 1560 if (!type) { 1561 p_err("mem alloc failed"); 1562 goto err_free_reuse_maps; 1563 } 1564 *type = 0; 1565 strcat(type, *argv); 1566 strcat(type, "/"); 1567 1568 err = get_prog_type_by_name(type, &common_prog_type, 1569 &expected_attach_type); 1570 free(type); 1571 if (err < 0) 1572 goto err_free_reuse_maps; 1573 } 1574 1575 NEXT_ARG(); 1576 } else if (is_prefix(*argv, "map")) { 1577 void *new_map_replace; 1578 char *endptr, *name; 1579 int fd; 1580 1581 NEXT_ARG(); 1582 1583 if (!REQ_ARGS(4)) 1584 goto err_free_reuse_maps; 1585 1586 if (is_prefix(*argv, "idx")) { 1587 NEXT_ARG(); 1588 1589 idx = strtoul(*argv, &endptr, 0); 1590 if (*endptr) { 1591 p_err("can't parse %s as IDX", *argv); 1592 goto err_free_reuse_maps; 1593 } 1594 name = NULL; 1595 } else if (is_prefix(*argv, "name")) { 1596 NEXT_ARG(); 1597 1598 name = *argv; 1599 idx = -1; 1600 } else { 1601 p_err("expected 'idx' or 'name', got: '%s'?", 1602 *argv); 1603 goto err_free_reuse_maps; 1604 } 1605 NEXT_ARG(); 1606 1607 fd = map_parse_fd(&argc, &argv); 1608 if (fd < 0) 1609 goto err_free_reuse_maps; 1610 1611 new_map_replace = libbpf_reallocarray(map_replace, 1612 old_map_fds + 1, 1613 sizeof(*map_replace)); 1614 if (!new_map_replace) { 1615 p_err("mem alloc failed"); 1616 goto err_free_reuse_maps; 1617 } 1618 map_replace = new_map_replace; 1619 1620 map_replace[old_map_fds].idx = idx; 1621 map_replace[old_map_fds].name = name; 1622 map_replace[old_map_fds].fd = fd; 1623 old_map_fds++; 1624 } else if (is_prefix(*argv, "dev")) { 1625 NEXT_ARG(); 1626 1627 if (ifindex) { 1628 p_err("offload device already specified"); 1629 goto err_free_reuse_maps; 1630 } 1631 if (!REQ_ARGS(1)) 1632 goto err_free_reuse_maps; 1633 1634 ifindex = if_nametoindex(*argv); 1635 if (!ifindex) { 1636 p_err("unrecognized netdevice '%s': %s", 1637 *argv, strerror(errno)); 1638 goto err_free_reuse_maps; 1639 } 1640 NEXT_ARG(); 1641 } else if (is_prefix(*argv, "pinmaps")) { 1642 NEXT_ARG(); 1643 1644 if (!REQ_ARGS(1)) 1645 goto err_free_reuse_maps; 1646 1647 pinmaps = GET_ARG(); 1648 } else if (is_prefix(*argv, "autoattach")) { 1649 auto_attach = true; 1650 NEXT_ARG(); 1651 } else { 1652 p_err("expected no more arguments, 'type', 'map' or 'dev', got: '%s'?", 1653 *argv); 1654 goto err_free_reuse_maps; 1655 } 1656 } 1657 1658 set_max_rlimit(); 1659 1660 if (verifier_logs) 1661 /* log_level1 + log_level2 + stats, but not stable UAPI */ 1662 open_opts.kernel_log_level = 1 + 2 + 4; 1663 1664 obj = bpf_object__open_file(file, &open_opts); 1665 if (libbpf_get_error(obj)) { 1666 p_err("failed to open object file"); 1667 goto err_free_reuse_maps; 1668 } 1669 1670 bpf_object__for_each_program(pos, obj) { 1671 enum bpf_prog_type prog_type = common_prog_type; 1672 1673 if (prog_type == BPF_PROG_TYPE_UNSPEC) { 1674 const char *sec_name = bpf_program__section_name(pos); 1675 1676 err = get_prog_type_by_name(sec_name, &prog_type, 1677 &expected_attach_type); 1678 if (err < 0) 1679 goto err_close_obj; 1680 } 1681 1682 bpf_program__set_ifindex(pos, ifindex); 1683 bpf_program__set_type(pos, prog_type); 1684 bpf_program__set_expected_attach_type(pos, expected_attach_type); 1685 } 1686 1687 qsort(map_replace, old_map_fds, sizeof(*map_replace), 1688 map_replace_compar); 1689 1690 /* After the sort maps by name will be first on the list, because they 1691 * have idx == -1. Resolve them. 1692 */ 1693 j = 0; 1694 while (j < old_map_fds && map_replace[j].name) { 1695 i = 0; 1696 bpf_object__for_each_map(map, obj) { 1697 if (!strcmp(bpf_map__name(map), map_replace[j].name)) { 1698 map_replace[j].idx = i; 1699 break; 1700 } 1701 i++; 1702 } 1703 if (map_replace[j].idx == -1) { 1704 p_err("unable to find map '%s'", map_replace[j].name); 1705 goto err_close_obj; 1706 } 1707 j++; 1708 } 1709 /* Resort if any names were resolved */ 1710 if (j) 1711 qsort(map_replace, old_map_fds, sizeof(*map_replace), 1712 map_replace_compar); 1713 1714 /* Set ifindex and name reuse */ 1715 j = 0; 1716 idx = 0; 1717 bpf_object__for_each_map(map, obj) { 1718 if (bpf_map__type(map) != BPF_MAP_TYPE_PERF_EVENT_ARRAY) 1719 bpf_map__set_ifindex(map, ifindex); 1720 1721 if (j < old_map_fds && idx == map_replace[j].idx) { 1722 err = bpf_map__reuse_fd(map, map_replace[j++].fd); 1723 if (err) { 1724 p_err("unable to set up map reuse: %d", err); 1725 goto err_close_obj; 1726 } 1727 1728 /* Next reuse wants to apply to the same map */ 1729 if (j < old_map_fds && map_replace[j].idx == idx) { 1730 p_err("replacement for map idx %d specified more than once", 1731 idx); 1732 goto err_close_obj; 1733 } 1734 } 1735 1736 idx++; 1737 } 1738 if (j < old_map_fds) { 1739 p_err("map idx '%d' not used", map_replace[j].idx); 1740 goto err_close_obj; 1741 } 1742 1743 err = bpf_object__load(obj); 1744 if (err) { 1745 p_err("failed to load object file"); 1746 goto err_close_obj; 1747 } 1748 1749 err = mount_bpffs_for_pin(pinfile); 1750 if (err) 1751 goto err_close_obj; 1752 1753 if (first_prog_only) { 1754 prog = bpf_object__next_program(obj, NULL); 1755 if (!prog) { 1756 p_err("object file doesn't contain any bpf program"); 1757 goto err_close_obj; 1758 } 1759 1760 if (auto_attach) 1761 err = auto_attach_program(prog, pinfile); 1762 else 1763 err = bpf_obj_pin(bpf_program__fd(prog), pinfile); 1764 if (err) { 1765 p_err("failed to pin program %s", 1766 bpf_program__section_name(prog)); 1767 goto err_close_obj; 1768 } 1769 } else { 1770 if (auto_attach) 1771 err = auto_attach_programs(obj, pinfile); 1772 else 1773 err = bpf_object__pin_programs(obj, pinfile); 1774 if (err) { 1775 p_err("failed to pin all programs"); 1776 goto err_close_obj; 1777 } 1778 } 1779 1780 if (pinmaps) { 1781 err = bpf_object__pin_maps(obj, pinmaps); 1782 if (err) { 1783 p_err("failed to pin all maps"); 1784 goto err_unpin; 1785 } 1786 } 1787 1788 if (json_output) 1789 jsonw_null(json_wtr); 1790 1791 bpf_object__close(obj); 1792 for (i = 0; i < old_map_fds; i++) 1793 close(map_replace[i].fd); 1794 free(map_replace); 1795 1796 return 0; 1797 1798 err_unpin: 1799 if (first_prog_only) 1800 unlink(pinfile); 1801 else 1802 bpf_object__unpin_programs(obj, pinfile); 1803 err_close_obj: 1804 if (!legacy_libbpf) { 1805 p_info("Warning: bpftool is now running in libbpf strict mode and has more stringent requirements about BPF programs.\n" 1806 "If it used to work for this object file but now doesn't, see --legacy option for more details.\n"); 1807 } 1808 1809 bpf_object__close(obj); 1810 err_free_reuse_maps: 1811 for (i = 0; i < old_map_fds; i++) 1812 close(map_replace[i].fd); 1813 free(map_replace); 1814 return -1; 1815 } 1816 1817 static int count_open_fds(void) 1818 { 1819 DIR *dp = opendir("/proc/self/fd"); 1820 struct dirent *de; 1821 int cnt = -3; 1822 1823 if (!dp) 1824 return -1; 1825 1826 while ((de = readdir(dp))) 1827 cnt++; 1828 1829 closedir(dp); 1830 return cnt; 1831 } 1832 1833 static int try_loader(struct gen_loader_opts *gen) 1834 { 1835 struct bpf_load_and_run_opts opts = {}; 1836 struct bpf_loader_ctx *ctx; 1837 int ctx_sz = sizeof(*ctx) + 64 * max(sizeof(struct bpf_map_desc), 1838 sizeof(struct bpf_prog_desc)); 1839 int log_buf_sz = (1u << 24) - 1; 1840 int err, fds_before, fd_delta; 1841 char *log_buf = NULL; 1842 1843 ctx = alloca(ctx_sz); 1844 memset(ctx, 0, ctx_sz); 1845 ctx->sz = ctx_sz; 1846 if (verifier_logs) { 1847 ctx->log_level = 1 + 2 + 4; 1848 ctx->log_size = log_buf_sz; 1849 log_buf = malloc(log_buf_sz); 1850 if (!log_buf) 1851 return -ENOMEM; 1852 ctx->log_buf = (long) log_buf; 1853 } 1854 opts.ctx = ctx; 1855 opts.data = gen->data; 1856 opts.data_sz = gen->data_sz; 1857 opts.insns = gen->insns; 1858 opts.insns_sz = gen->insns_sz; 1859 fds_before = count_open_fds(); 1860 err = bpf_load_and_run(&opts); 1861 fd_delta = count_open_fds() - fds_before; 1862 if (err < 0 || verifier_logs) { 1863 fprintf(stderr, "err %d\n%s\n%s", err, opts.errstr, log_buf); 1864 if (fd_delta && err < 0) 1865 fprintf(stderr, "loader prog leaked %d FDs\n", 1866 fd_delta); 1867 } 1868 free(log_buf); 1869 return err; 1870 } 1871 1872 static int do_loader(int argc, char **argv) 1873 { 1874 DECLARE_LIBBPF_OPTS(bpf_object_open_opts, open_opts); 1875 DECLARE_LIBBPF_OPTS(gen_loader_opts, gen); 1876 struct bpf_object *obj; 1877 const char *file; 1878 int err = 0; 1879 1880 if (!REQ_ARGS(1)) 1881 return -1; 1882 file = GET_ARG(); 1883 1884 if (verifier_logs) 1885 /* log_level1 + log_level2 + stats, but not stable UAPI */ 1886 open_opts.kernel_log_level = 1 + 2 + 4; 1887 1888 obj = bpf_object__open_file(file, &open_opts); 1889 if (libbpf_get_error(obj)) { 1890 p_err("failed to open object file"); 1891 goto err_close_obj; 1892 } 1893 1894 err = bpf_object__gen_loader(obj, &gen); 1895 if (err) 1896 goto err_close_obj; 1897 1898 err = bpf_object__load(obj); 1899 if (err) { 1900 p_err("failed to load object file"); 1901 goto err_close_obj; 1902 } 1903 1904 if (verifier_logs) { 1905 struct dump_data dd = {}; 1906 1907 kernel_syms_load(&dd); 1908 dump_xlated_plain(&dd, (void *)gen.insns, gen.insns_sz, false, false); 1909 kernel_syms_destroy(&dd); 1910 } 1911 err = try_loader(&gen); 1912 err_close_obj: 1913 bpf_object__close(obj); 1914 return err; 1915 } 1916 1917 static int do_load(int argc, char **argv) 1918 { 1919 if (use_loader) 1920 return do_loader(argc, argv); 1921 return load_with_options(argc, argv, true); 1922 } 1923 1924 static int do_loadall(int argc, char **argv) 1925 { 1926 return load_with_options(argc, argv, false); 1927 } 1928 1929 #ifdef BPFTOOL_WITHOUT_SKELETONS 1930 1931 static int do_profile(int argc, char **argv) 1932 { 1933 p_err("bpftool prog profile command is not supported. Please build bpftool with clang >= 10.0.0"); 1934 return 0; 1935 } 1936 1937 #else /* BPFTOOL_WITHOUT_SKELETONS */ 1938 1939 #include "profiler.skel.h" 1940 1941 struct profile_metric { 1942 const char *name; 1943 struct bpf_perf_event_value val; 1944 struct perf_event_attr attr; 1945 bool selected; 1946 1947 /* calculate ratios like instructions per cycle */ 1948 const int ratio_metric; /* 0 for N/A, 1 for index 0 (cycles) */ 1949 const char *ratio_desc; 1950 const float ratio_mul; 1951 } metrics[] = { 1952 { 1953 .name = "cycles", 1954 .attr = { 1955 .type = PERF_TYPE_HARDWARE, 1956 .config = PERF_COUNT_HW_CPU_CYCLES, 1957 .exclude_user = 1, 1958 }, 1959 }, 1960 { 1961 .name = "instructions", 1962 .attr = { 1963 .type = PERF_TYPE_HARDWARE, 1964 .config = PERF_COUNT_HW_INSTRUCTIONS, 1965 .exclude_user = 1, 1966 }, 1967 .ratio_metric = 1, 1968 .ratio_desc = "insns per cycle", 1969 .ratio_mul = 1.0, 1970 }, 1971 { 1972 .name = "l1d_loads", 1973 .attr = { 1974 .type = PERF_TYPE_HW_CACHE, 1975 .config = 1976 PERF_COUNT_HW_CACHE_L1D | 1977 (PERF_COUNT_HW_CACHE_OP_READ << 8) | 1978 (PERF_COUNT_HW_CACHE_RESULT_ACCESS << 16), 1979 .exclude_user = 1, 1980 }, 1981 }, 1982 { 1983 .name = "llc_misses", 1984 .attr = { 1985 .type = PERF_TYPE_HW_CACHE, 1986 .config = 1987 PERF_COUNT_HW_CACHE_LL | 1988 (PERF_COUNT_HW_CACHE_OP_READ << 8) | 1989 (PERF_COUNT_HW_CACHE_RESULT_MISS << 16), 1990 .exclude_user = 1 1991 }, 1992 .ratio_metric = 2, 1993 .ratio_desc = "LLC misses per million insns", 1994 .ratio_mul = 1e6, 1995 }, 1996 { 1997 .name = "itlb_misses", 1998 .attr = { 1999 .type = PERF_TYPE_HW_CACHE, 2000 .config = 2001 PERF_COUNT_HW_CACHE_ITLB | 2002 (PERF_COUNT_HW_CACHE_OP_READ << 8) | 2003 (PERF_COUNT_HW_CACHE_RESULT_MISS << 16), 2004 .exclude_user = 1 2005 }, 2006 .ratio_metric = 2, 2007 .ratio_desc = "itlb misses per million insns", 2008 .ratio_mul = 1e6, 2009 }, 2010 { 2011 .name = "dtlb_misses", 2012 .attr = { 2013 .type = PERF_TYPE_HW_CACHE, 2014 .config = 2015 PERF_COUNT_HW_CACHE_DTLB | 2016 (PERF_COUNT_HW_CACHE_OP_READ << 8) | 2017 (PERF_COUNT_HW_CACHE_RESULT_MISS << 16), 2018 .exclude_user = 1 2019 }, 2020 .ratio_metric = 2, 2021 .ratio_desc = "dtlb misses per million insns", 2022 .ratio_mul = 1e6, 2023 }, 2024 }; 2025 2026 static __u64 profile_total_count; 2027 2028 #define MAX_NUM_PROFILE_METRICS 4 2029 2030 static int profile_parse_metrics(int argc, char **argv) 2031 { 2032 unsigned int metric_cnt; 2033 int selected_cnt = 0; 2034 unsigned int i; 2035 2036 metric_cnt = ARRAY_SIZE(metrics); 2037 2038 while (argc > 0) { 2039 for (i = 0; i < metric_cnt; i++) { 2040 if (is_prefix(argv[0], metrics[i].name)) { 2041 if (!metrics[i].selected) 2042 selected_cnt++; 2043 metrics[i].selected = true; 2044 break; 2045 } 2046 } 2047 if (i == metric_cnt) { 2048 p_err("unknown metric %s", argv[0]); 2049 return -1; 2050 } 2051 NEXT_ARG(); 2052 } 2053 if (selected_cnt > MAX_NUM_PROFILE_METRICS) { 2054 p_err("too many (%d) metrics, please specify no more than %d metrics at at time", 2055 selected_cnt, MAX_NUM_PROFILE_METRICS); 2056 return -1; 2057 } 2058 return selected_cnt; 2059 } 2060 2061 static void profile_read_values(struct profiler_bpf *obj) 2062 { 2063 __u32 m, cpu, num_cpu = obj->rodata->num_cpu; 2064 int reading_map_fd, count_map_fd; 2065 __u64 counts[num_cpu]; 2066 __u32 key = 0; 2067 int err; 2068 2069 reading_map_fd = bpf_map__fd(obj->maps.accum_readings); 2070 count_map_fd = bpf_map__fd(obj->maps.counts); 2071 if (reading_map_fd < 0 || count_map_fd < 0) { 2072 p_err("failed to get fd for map"); 2073 return; 2074 } 2075 2076 err = bpf_map_lookup_elem(count_map_fd, &key, counts); 2077 if (err) { 2078 p_err("failed to read count_map: %s", strerror(errno)); 2079 return; 2080 } 2081 2082 profile_total_count = 0; 2083 for (cpu = 0; cpu < num_cpu; cpu++) 2084 profile_total_count += counts[cpu]; 2085 2086 for (m = 0; m < ARRAY_SIZE(metrics); m++) { 2087 struct bpf_perf_event_value values[num_cpu]; 2088 2089 if (!metrics[m].selected) 2090 continue; 2091 2092 err = bpf_map_lookup_elem(reading_map_fd, &key, values); 2093 if (err) { 2094 p_err("failed to read reading_map: %s", 2095 strerror(errno)); 2096 return; 2097 } 2098 for (cpu = 0; cpu < num_cpu; cpu++) { 2099 metrics[m].val.counter += values[cpu].counter; 2100 metrics[m].val.enabled += values[cpu].enabled; 2101 metrics[m].val.running += values[cpu].running; 2102 } 2103 key++; 2104 } 2105 } 2106 2107 static void profile_print_readings_json(void) 2108 { 2109 __u32 m; 2110 2111 jsonw_start_array(json_wtr); 2112 for (m = 0; m < ARRAY_SIZE(metrics); m++) { 2113 if (!metrics[m].selected) 2114 continue; 2115 jsonw_start_object(json_wtr); 2116 jsonw_string_field(json_wtr, "metric", metrics[m].name); 2117 jsonw_lluint_field(json_wtr, "run_cnt", profile_total_count); 2118 jsonw_lluint_field(json_wtr, "value", metrics[m].val.counter); 2119 jsonw_lluint_field(json_wtr, "enabled", metrics[m].val.enabled); 2120 jsonw_lluint_field(json_wtr, "running", metrics[m].val.running); 2121 2122 jsonw_end_object(json_wtr); 2123 } 2124 jsonw_end_array(json_wtr); 2125 } 2126 2127 static void profile_print_readings_plain(void) 2128 { 2129 __u32 m; 2130 2131 printf("\n%18llu %-20s\n", profile_total_count, "run_cnt"); 2132 for (m = 0; m < ARRAY_SIZE(metrics); m++) { 2133 struct bpf_perf_event_value *val = &metrics[m].val; 2134 int r; 2135 2136 if (!metrics[m].selected) 2137 continue; 2138 printf("%18llu %-20s", val->counter, metrics[m].name); 2139 2140 r = metrics[m].ratio_metric - 1; 2141 if (r >= 0 && metrics[r].selected && 2142 metrics[r].val.counter > 0) { 2143 printf("# %8.2f %-30s", 2144 val->counter * metrics[m].ratio_mul / 2145 metrics[r].val.counter, 2146 metrics[m].ratio_desc); 2147 } else { 2148 printf("%-41s", ""); 2149 } 2150 2151 if (val->enabled > val->running) 2152 printf("(%4.2f%%)", 2153 val->running * 100.0 / val->enabled); 2154 printf("\n"); 2155 } 2156 } 2157 2158 static void profile_print_readings(void) 2159 { 2160 if (json_output) 2161 profile_print_readings_json(); 2162 else 2163 profile_print_readings_plain(); 2164 } 2165 2166 static char *profile_target_name(int tgt_fd) 2167 { 2168 struct bpf_func_info func_info; 2169 struct bpf_prog_info info = {}; 2170 __u32 info_len = sizeof(info); 2171 const struct btf_type *t; 2172 __u32 func_info_rec_size; 2173 struct btf *btf = NULL; 2174 char *name = NULL; 2175 int err; 2176 2177 err = bpf_obj_get_info_by_fd(tgt_fd, &info, &info_len); 2178 if (err) { 2179 p_err("failed to bpf_obj_get_info_by_fd for prog FD %d", tgt_fd); 2180 goto out; 2181 } 2182 2183 if (info.btf_id == 0) { 2184 p_err("prog FD %d doesn't have valid btf", tgt_fd); 2185 goto out; 2186 } 2187 2188 func_info_rec_size = info.func_info_rec_size; 2189 if (info.nr_func_info == 0) { 2190 p_err("bpf_obj_get_info_by_fd for prog FD %d found 0 func_info", tgt_fd); 2191 goto out; 2192 } 2193 2194 memset(&info, 0, sizeof(info)); 2195 info.nr_func_info = 1; 2196 info.func_info_rec_size = func_info_rec_size; 2197 info.func_info = ptr_to_u64(&func_info); 2198 2199 err = bpf_obj_get_info_by_fd(tgt_fd, &info, &info_len); 2200 if (err) { 2201 p_err("failed to get func_info for prog FD %d", tgt_fd); 2202 goto out; 2203 } 2204 2205 btf = btf__load_from_kernel_by_id(info.btf_id); 2206 if (libbpf_get_error(btf)) { 2207 p_err("failed to load btf for prog FD %d", tgt_fd); 2208 goto out; 2209 } 2210 2211 t = btf__type_by_id(btf, func_info.type_id); 2212 if (!t) { 2213 p_err("btf %d doesn't have type %d", 2214 info.btf_id, func_info.type_id); 2215 goto out; 2216 } 2217 name = strdup(btf__name_by_offset(btf, t->name_off)); 2218 out: 2219 btf__free(btf); 2220 return name; 2221 } 2222 2223 static struct profiler_bpf *profile_obj; 2224 static int profile_tgt_fd = -1; 2225 static char *profile_tgt_name; 2226 static int *profile_perf_events; 2227 static int profile_perf_event_cnt; 2228 2229 static void profile_close_perf_events(struct profiler_bpf *obj) 2230 { 2231 int i; 2232 2233 for (i = profile_perf_event_cnt - 1; i >= 0; i--) 2234 close(profile_perf_events[i]); 2235 2236 free(profile_perf_events); 2237 profile_perf_event_cnt = 0; 2238 } 2239 2240 static int profile_open_perf_events(struct profiler_bpf *obj) 2241 { 2242 unsigned int cpu, m; 2243 int map_fd, pmu_fd; 2244 2245 profile_perf_events = calloc( 2246 sizeof(int), obj->rodata->num_cpu * obj->rodata->num_metric); 2247 if (!profile_perf_events) { 2248 p_err("failed to allocate memory for perf_event array: %s", 2249 strerror(errno)); 2250 return -1; 2251 } 2252 map_fd = bpf_map__fd(obj->maps.events); 2253 if (map_fd < 0) { 2254 p_err("failed to get fd for events map"); 2255 return -1; 2256 } 2257 2258 for (m = 0; m < ARRAY_SIZE(metrics); m++) { 2259 if (!metrics[m].selected) 2260 continue; 2261 for (cpu = 0; cpu < obj->rodata->num_cpu; cpu++) { 2262 pmu_fd = syscall(__NR_perf_event_open, &metrics[m].attr, 2263 -1/*pid*/, cpu, -1/*group_fd*/, 0); 2264 if (pmu_fd < 0 || 2265 bpf_map_update_elem(map_fd, &profile_perf_event_cnt, 2266 &pmu_fd, BPF_ANY) || 2267 ioctl(pmu_fd, PERF_EVENT_IOC_ENABLE, 0)) { 2268 p_err("failed to create event %s on cpu %d", 2269 metrics[m].name, cpu); 2270 return -1; 2271 } 2272 profile_perf_events[profile_perf_event_cnt++] = pmu_fd; 2273 } 2274 } 2275 return 0; 2276 } 2277 2278 static void profile_print_and_cleanup(void) 2279 { 2280 profile_close_perf_events(profile_obj); 2281 profile_read_values(profile_obj); 2282 profile_print_readings(); 2283 profiler_bpf__destroy(profile_obj); 2284 2285 close(profile_tgt_fd); 2286 free(profile_tgt_name); 2287 } 2288 2289 static void int_exit(int signo) 2290 { 2291 profile_print_and_cleanup(); 2292 exit(0); 2293 } 2294 2295 static int do_profile(int argc, char **argv) 2296 { 2297 int num_metric, num_cpu, err = -1; 2298 struct bpf_program *prog; 2299 unsigned long duration; 2300 char *endptr; 2301 2302 /* we at least need two args for the prog and one metric */ 2303 if (!REQ_ARGS(3)) 2304 return -EINVAL; 2305 2306 /* parse target fd */ 2307 profile_tgt_fd = prog_parse_fd(&argc, &argv); 2308 if (profile_tgt_fd < 0) { 2309 p_err("failed to parse fd"); 2310 return -1; 2311 } 2312 2313 /* parse profiling optional duration */ 2314 if (argc > 2 && is_prefix(argv[0], "duration")) { 2315 NEXT_ARG(); 2316 duration = strtoul(*argv, &endptr, 0); 2317 if (*endptr) 2318 usage(); 2319 NEXT_ARG(); 2320 } else { 2321 duration = UINT_MAX; 2322 } 2323 2324 num_metric = profile_parse_metrics(argc, argv); 2325 if (num_metric <= 0) 2326 goto out; 2327 2328 num_cpu = libbpf_num_possible_cpus(); 2329 if (num_cpu <= 0) { 2330 p_err("failed to identify number of CPUs"); 2331 goto out; 2332 } 2333 2334 profile_obj = profiler_bpf__open(); 2335 if (!profile_obj) { 2336 p_err("failed to open and/or load BPF object"); 2337 goto out; 2338 } 2339 2340 profile_obj->rodata->num_cpu = num_cpu; 2341 profile_obj->rodata->num_metric = num_metric; 2342 2343 /* adjust map sizes */ 2344 bpf_map__set_max_entries(profile_obj->maps.events, num_metric * num_cpu); 2345 bpf_map__set_max_entries(profile_obj->maps.fentry_readings, num_metric); 2346 bpf_map__set_max_entries(profile_obj->maps.accum_readings, num_metric); 2347 bpf_map__set_max_entries(profile_obj->maps.counts, 1); 2348 2349 /* change target name */ 2350 profile_tgt_name = profile_target_name(profile_tgt_fd); 2351 if (!profile_tgt_name) 2352 goto out; 2353 2354 bpf_object__for_each_program(prog, profile_obj->obj) { 2355 err = bpf_program__set_attach_target(prog, profile_tgt_fd, 2356 profile_tgt_name); 2357 if (err) { 2358 p_err("failed to set attach target\n"); 2359 goto out; 2360 } 2361 } 2362 2363 set_max_rlimit(); 2364 err = profiler_bpf__load(profile_obj); 2365 if (err) { 2366 p_err("failed to load profile_obj"); 2367 goto out; 2368 } 2369 2370 err = profile_open_perf_events(profile_obj); 2371 if (err) 2372 goto out; 2373 2374 err = profiler_bpf__attach(profile_obj); 2375 if (err) { 2376 p_err("failed to attach profile_obj"); 2377 goto out; 2378 } 2379 signal(SIGINT, int_exit); 2380 2381 sleep(duration); 2382 profile_print_and_cleanup(); 2383 return 0; 2384 2385 out: 2386 profile_close_perf_events(profile_obj); 2387 if (profile_obj) 2388 profiler_bpf__destroy(profile_obj); 2389 close(profile_tgt_fd); 2390 free(profile_tgt_name); 2391 return err; 2392 } 2393 2394 #endif /* BPFTOOL_WITHOUT_SKELETONS */ 2395 2396 static int do_help(int argc, char **argv) 2397 { 2398 if (json_output) { 2399 jsonw_null(json_wtr); 2400 return 0; 2401 } 2402 2403 fprintf(stderr, 2404 "Usage: %1$s %2$s { show | list } [PROG]\n" 2405 " %1$s %2$s dump xlated PROG [{ file FILE | opcodes | visual | linum }]\n" 2406 " %1$s %2$s dump jited PROG [{ file FILE | opcodes | linum }]\n" 2407 " %1$s %2$s pin PROG FILE\n" 2408 " %1$s %2$s { load | loadall } OBJ PATH \\\n" 2409 " [type TYPE] [dev NAME] \\\n" 2410 " [map { idx IDX | name NAME } MAP]\\\n" 2411 " [pinmaps MAP_DIR]\n" 2412 " [autoattach]\n" 2413 " %1$s %2$s attach PROG ATTACH_TYPE [MAP]\n" 2414 " %1$s %2$s detach PROG ATTACH_TYPE [MAP]\n" 2415 " %1$s %2$s run PROG \\\n" 2416 " data_in FILE \\\n" 2417 " [data_out FILE [data_size_out L]] \\\n" 2418 " [ctx_in FILE [ctx_out FILE [ctx_size_out M]]] \\\n" 2419 " [repeat N]\n" 2420 " %1$s %2$s profile PROG [duration DURATION] METRICs\n" 2421 " %1$s %2$s tracelog\n" 2422 " %1$s %2$s help\n" 2423 "\n" 2424 " " HELP_SPEC_MAP "\n" 2425 " " HELP_SPEC_PROGRAM "\n" 2426 " TYPE := { socket | kprobe | kretprobe | classifier | action |\n" 2427 " tracepoint | raw_tracepoint | xdp | perf_event | cgroup/skb |\n" 2428 " cgroup/sock | cgroup/dev | lwt_in | lwt_out | lwt_xmit |\n" 2429 " lwt_seg6local | sockops | sk_skb | sk_msg | lirc_mode2 |\n" 2430 " sk_reuseport | flow_dissector | cgroup/sysctl |\n" 2431 " cgroup/bind4 | cgroup/bind6 | cgroup/post_bind4 |\n" 2432 " cgroup/post_bind6 | cgroup/connect4 | cgroup/connect6 |\n" 2433 " cgroup/getpeername4 | cgroup/getpeername6 |\n" 2434 " cgroup/getsockname4 | cgroup/getsockname6 | cgroup/sendmsg4 |\n" 2435 " cgroup/sendmsg6 | cgroup/recvmsg4 | cgroup/recvmsg6 |\n" 2436 " cgroup/getsockopt | cgroup/setsockopt | cgroup/sock_release |\n" 2437 " struct_ops | fentry | fexit | freplace | sk_lookup }\n" 2438 " ATTACH_TYPE := { sk_msg_verdict | sk_skb_verdict | sk_skb_stream_verdict |\n" 2439 " sk_skb_stream_parser | flow_dissector }\n" 2440 " METRIC := { cycles | instructions | l1d_loads | llc_misses | itlb_misses | dtlb_misses }\n" 2441 " " HELP_SPEC_OPTIONS " |\n" 2442 " {-f|--bpffs} | {-m|--mapcompat} | {-n|--nomount} |\n" 2443 " {-L|--use-loader} }\n" 2444 "", 2445 bin_name, argv[-2]); 2446 2447 return 0; 2448 } 2449 2450 static const struct cmd cmds[] = { 2451 { "show", do_show }, 2452 { "list", do_show }, 2453 { "help", do_help }, 2454 { "dump", do_dump }, 2455 { "pin", do_pin }, 2456 { "load", do_load }, 2457 { "loadall", do_loadall }, 2458 { "attach", do_attach }, 2459 { "detach", do_detach }, 2460 { "tracelog", do_tracelog }, 2461 { "run", do_run }, 2462 { "profile", do_profile }, 2463 { 0 } 2464 }; 2465 2466 int do_prog(int argc, char **argv) 2467 { 2468 return cmd_select(cmds, argc, argv, do_help); 2469 } 2470