1 // SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) 2 /* Copyright (C) 2017-2018 Netronome Systems, Inc. */ 3 4 #ifndef _GNU_SOURCE 5 #define _GNU_SOURCE 6 #endif 7 #include <errno.h> 8 #include <fcntl.h> 9 #include <signal.h> 10 #include <stdarg.h> 11 #include <stdio.h> 12 #include <stdlib.h> 13 #include <string.h> 14 #include <time.h> 15 #include <unistd.h> 16 #include <net/if.h> 17 #include <sys/ioctl.h> 18 #include <sys/types.h> 19 #include <sys/stat.h> 20 #include <sys/syscall.h> 21 #include <dirent.h> 22 23 #include <linux/err.h> 24 #include <linux/perf_event.h> 25 #include <linux/sizes.h> 26 27 #include <bpf/bpf.h> 28 #include <bpf/btf.h> 29 #include <bpf/hashmap.h> 30 #include <bpf/libbpf.h> 31 #include <bpf/libbpf_internal.h> 32 #include <bpf/skel_internal.h> 33 34 #include "cfg.h" 35 #include "main.h" 36 #include "xlated_dumper.h" 37 38 #define BPF_METADATA_PREFIX "bpf_metadata_" 39 #define BPF_METADATA_PREFIX_LEN (sizeof(BPF_METADATA_PREFIX) - 1) 40 41 enum dump_mode { 42 DUMP_JITED, 43 DUMP_XLATED, 44 }; 45 46 static const bool attach_types[] = { 47 [BPF_SK_SKB_STREAM_PARSER] = true, 48 [BPF_SK_SKB_STREAM_VERDICT] = true, 49 [BPF_SK_SKB_VERDICT] = true, 50 [BPF_SK_MSG_VERDICT] = true, 51 [BPF_FLOW_DISSECTOR] = true, 52 [__MAX_BPF_ATTACH_TYPE] = false, 53 }; 54 55 /* Textual representations traditionally used by the program and kept around 56 * for the sake of backwards compatibility. 57 */ 58 static const char * const attach_type_strings[] = { 59 [BPF_SK_SKB_STREAM_PARSER] = "stream_parser", 60 [BPF_SK_SKB_STREAM_VERDICT] = "stream_verdict", 61 [BPF_SK_SKB_VERDICT] = "skb_verdict", 62 [BPF_SK_MSG_VERDICT] = "msg_verdict", 63 [__MAX_BPF_ATTACH_TYPE] = NULL, 64 }; 65 66 static struct hashmap *prog_table; 67 68 static enum bpf_attach_type parse_attach_type(const char *str) 69 { 70 enum bpf_attach_type type; 71 72 for (type = 0; type < __MAX_BPF_ATTACH_TYPE; type++) { 73 if (attach_types[type]) { 74 const char *attach_type_str; 75 76 attach_type_str = libbpf_bpf_attach_type_str(type); 77 if (!strcmp(str, attach_type_str)) 78 return type; 79 } 80 81 if (attach_type_strings[type] && 82 is_prefix(str, attach_type_strings[type])) 83 return type; 84 } 85 86 return __MAX_BPF_ATTACH_TYPE; 87 } 88 89 static int prep_prog_info(struct bpf_prog_info *const info, enum dump_mode mode, 90 void **info_data, size_t *const info_data_sz) 91 { 92 struct bpf_prog_info holder = {}; 93 size_t needed = 0; 94 void *ptr; 95 96 if (mode == DUMP_JITED) { 97 holder.jited_prog_len = info->jited_prog_len; 98 needed += info->jited_prog_len; 99 } else { 100 holder.xlated_prog_len = info->xlated_prog_len; 101 needed += info->xlated_prog_len; 102 } 103 104 holder.nr_jited_ksyms = info->nr_jited_ksyms; 105 needed += info->nr_jited_ksyms * sizeof(__u64); 106 107 holder.nr_jited_func_lens = info->nr_jited_func_lens; 108 needed += info->nr_jited_func_lens * sizeof(__u32); 109 110 holder.nr_func_info = info->nr_func_info; 111 holder.func_info_rec_size = info->func_info_rec_size; 112 needed += info->nr_func_info * info->func_info_rec_size; 113 114 holder.nr_line_info = info->nr_line_info; 115 holder.line_info_rec_size = info->line_info_rec_size; 116 needed += info->nr_line_info * info->line_info_rec_size; 117 118 holder.nr_jited_line_info = info->nr_jited_line_info; 119 holder.jited_line_info_rec_size = info->jited_line_info_rec_size; 120 needed += info->nr_jited_line_info * info->jited_line_info_rec_size; 121 122 if (needed > *info_data_sz) { 123 ptr = realloc(*info_data, needed); 124 if (!ptr) 125 return -1; 126 127 *info_data = ptr; 128 *info_data_sz = needed; 129 } 130 ptr = *info_data; 131 132 if (mode == DUMP_JITED) { 133 holder.jited_prog_insns = ptr_to_u64(ptr); 134 ptr += holder.jited_prog_len; 135 } else { 136 holder.xlated_prog_insns = ptr_to_u64(ptr); 137 ptr += holder.xlated_prog_len; 138 } 139 140 holder.jited_ksyms = ptr_to_u64(ptr); 141 ptr += holder.nr_jited_ksyms * sizeof(__u64); 142 143 holder.jited_func_lens = ptr_to_u64(ptr); 144 ptr += holder.nr_jited_func_lens * sizeof(__u32); 145 146 holder.func_info = ptr_to_u64(ptr); 147 ptr += holder.nr_func_info * holder.func_info_rec_size; 148 149 holder.line_info = ptr_to_u64(ptr); 150 ptr += holder.nr_line_info * holder.line_info_rec_size; 151 152 holder.jited_line_info = ptr_to_u64(ptr); 153 ptr += holder.nr_jited_line_info * holder.jited_line_info_rec_size; 154 155 *info = holder; 156 return 0; 157 } 158 159 static void print_boot_time(__u64 nsecs, char *buf, unsigned int size) 160 { 161 struct timespec real_time_ts, boot_time_ts; 162 time_t wallclock_secs; 163 struct tm load_tm; 164 165 buf[--size] = '\0'; 166 167 if (clock_gettime(CLOCK_REALTIME, &real_time_ts) || 168 clock_gettime(CLOCK_BOOTTIME, &boot_time_ts)) { 169 perror("Can't read clocks"); 170 snprintf(buf, size, "%llu", nsecs / 1000000000); 171 return; 172 } 173 174 wallclock_secs = (real_time_ts.tv_sec - boot_time_ts.tv_sec) + 175 (real_time_ts.tv_nsec - boot_time_ts.tv_nsec + nsecs) / 176 1000000000; 177 178 179 if (!localtime_r(&wallclock_secs, &load_tm)) { 180 snprintf(buf, size, "%llu", nsecs / 1000000000); 181 return; 182 } 183 184 if (json_output) 185 strftime(buf, size, "%s", &load_tm); 186 else 187 strftime(buf, size, "%FT%T%z", &load_tm); 188 } 189 190 static void show_prog_maps(int fd, __u32 num_maps) 191 { 192 struct bpf_prog_info info = {}; 193 __u32 len = sizeof(info); 194 __u32 map_ids[num_maps]; 195 unsigned int i; 196 int err; 197 198 info.nr_map_ids = num_maps; 199 info.map_ids = ptr_to_u64(map_ids); 200 201 err = bpf_obj_get_info_by_fd(fd, &info, &len); 202 if (err || !info.nr_map_ids) 203 return; 204 205 if (json_output) { 206 jsonw_name(json_wtr, "map_ids"); 207 jsonw_start_array(json_wtr); 208 for (i = 0; i < info.nr_map_ids; i++) 209 jsonw_uint(json_wtr, map_ids[i]); 210 jsonw_end_array(json_wtr); 211 } else { 212 printf(" map_ids "); 213 for (i = 0; i < info.nr_map_ids; i++) 214 printf("%u%s", map_ids[i], 215 i == info.nr_map_ids - 1 ? "" : ","); 216 } 217 } 218 219 static void *find_metadata(int prog_fd, struct bpf_map_info *map_info) 220 { 221 struct bpf_prog_info prog_info; 222 __u32 prog_info_len; 223 __u32 map_info_len; 224 void *value = NULL; 225 __u32 *map_ids; 226 int nr_maps; 227 int key = 0; 228 int map_fd; 229 int ret; 230 __u32 i; 231 232 memset(&prog_info, 0, sizeof(prog_info)); 233 prog_info_len = sizeof(prog_info); 234 ret = bpf_obj_get_info_by_fd(prog_fd, &prog_info, &prog_info_len); 235 if (ret) 236 return NULL; 237 238 if (!prog_info.nr_map_ids) 239 return NULL; 240 241 map_ids = calloc(prog_info.nr_map_ids, sizeof(__u32)); 242 if (!map_ids) 243 return NULL; 244 245 nr_maps = prog_info.nr_map_ids; 246 memset(&prog_info, 0, sizeof(prog_info)); 247 prog_info.nr_map_ids = nr_maps; 248 prog_info.map_ids = ptr_to_u64(map_ids); 249 prog_info_len = sizeof(prog_info); 250 251 ret = bpf_obj_get_info_by_fd(prog_fd, &prog_info, &prog_info_len); 252 if (ret) 253 goto free_map_ids; 254 255 for (i = 0; i < prog_info.nr_map_ids; i++) { 256 map_fd = bpf_map_get_fd_by_id(map_ids[i]); 257 if (map_fd < 0) 258 goto free_map_ids; 259 260 memset(map_info, 0, sizeof(*map_info)); 261 map_info_len = sizeof(*map_info); 262 ret = bpf_obj_get_info_by_fd(map_fd, map_info, &map_info_len); 263 if (ret < 0) { 264 close(map_fd); 265 goto free_map_ids; 266 } 267 268 if (map_info->type != BPF_MAP_TYPE_ARRAY || 269 map_info->key_size != sizeof(int) || 270 map_info->max_entries != 1 || 271 !map_info->btf_value_type_id || 272 !strstr(map_info->name, ".rodata")) { 273 close(map_fd); 274 continue; 275 } 276 277 value = malloc(map_info->value_size); 278 if (!value) { 279 close(map_fd); 280 goto free_map_ids; 281 } 282 283 if (bpf_map_lookup_elem(map_fd, &key, value)) { 284 close(map_fd); 285 free(value); 286 value = NULL; 287 goto free_map_ids; 288 } 289 290 close(map_fd); 291 break; 292 } 293 294 free_map_ids: 295 free(map_ids); 296 return value; 297 } 298 299 static bool has_metadata_prefix(const char *s) 300 { 301 return strncmp(s, BPF_METADATA_PREFIX, BPF_METADATA_PREFIX_LEN) == 0; 302 } 303 304 static void show_prog_metadata(int fd, __u32 num_maps) 305 { 306 const struct btf_type *t_datasec, *t_var; 307 struct bpf_map_info map_info; 308 struct btf_var_secinfo *vsi; 309 bool printed_header = false; 310 unsigned int i, vlen; 311 void *value = NULL; 312 const char *name; 313 struct btf *btf; 314 int err; 315 316 if (!num_maps) 317 return; 318 319 memset(&map_info, 0, sizeof(map_info)); 320 value = find_metadata(fd, &map_info); 321 if (!value) 322 return; 323 324 btf = btf__load_from_kernel_by_id(map_info.btf_id); 325 if (!btf) 326 goto out_free; 327 328 t_datasec = btf__type_by_id(btf, map_info.btf_value_type_id); 329 if (!btf_is_datasec(t_datasec)) 330 goto out_free; 331 332 vlen = btf_vlen(t_datasec); 333 vsi = btf_var_secinfos(t_datasec); 334 335 /* We don't proceed to check the kinds of the elements of the DATASEC. 336 * The verifier enforces them to be BTF_KIND_VAR. 337 */ 338 339 if (json_output) { 340 struct btf_dumper d = { 341 .btf = btf, 342 .jw = json_wtr, 343 .is_plain_text = false, 344 }; 345 346 for (i = 0; i < vlen; i++, vsi++) { 347 t_var = btf__type_by_id(btf, vsi->type); 348 name = btf__name_by_offset(btf, t_var->name_off); 349 350 if (!has_metadata_prefix(name)) 351 continue; 352 353 if (!printed_header) { 354 jsonw_name(json_wtr, "metadata"); 355 jsonw_start_object(json_wtr); 356 printed_header = true; 357 } 358 359 jsonw_name(json_wtr, name + BPF_METADATA_PREFIX_LEN); 360 err = btf_dumper_type(&d, t_var->type, value + vsi->offset); 361 if (err) { 362 p_err("btf dump failed: %d", err); 363 break; 364 } 365 } 366 if (printed_header) 367 jsonw_end_object(json_wtr); 368 } else { 369 json_writer_t *btf_wtr; 370 struct btf_dumper d = { 371 .btf = btf, 372 .is_plain_text = true, 373 }; 374 375 for (i = 0; i < vlen; i++, vsi++) { 376 t_var = btf__type_by_id(btf, vsi->type); 377 name = btf__name_by_offset(btf, t_var->name_off); 378 379 if (!has_metadata_prefix(name)) 380 continue; 381 382 if (!printed_header) { 383 printf("\tmetadata:"); 384 385 btf_wtr = jsonw_new(stdout); 386 if (!btf_wtr) { 387 p_err("jsonw alloc failed"); 388 goto out_free; 389 } 390 d.jw = btf_wtr, 391 392 printed_header = true; 393 } 394 395 printf("\n\t\t%s = ", name + BPF_METADATA_PREFIX_LEN); 396 397 jsonw_reset(btf_wtr); 398 err = btf_dumper_type(&d, t_var->type, value + vsi->offset); 399 if (err) { 400 p_err("btf dump failed: %d", err); 401 break; 402 } 403 } 404 if (printed_header) 405 jsonw_destroy(&btf_wtr); 406 } 407 408 out_free: 409 btf__free(btf); 410 free(value); 411 } 412 413 static void print_prog_header_json(struct bpf_prog_info *info, int fd) 414 { 415 const char *prog_type_str; 416 char prog_name[MAX_PROG_FULL_NAME]; 417 418 jsonw_uint_field(json_wtr, "id", info->id); 419 prog_type_str = libbpf_bpf_prog_type_str(info->type); 420 421 if (prog_type_str) 422 jsonw_string_field(json_wtr, "type", prog_type_str); 423 else 424 jsonw_uint_field(json_wtr, "type", info->type); 425 426 if (*info->name) { 427 get_prog_full_name(info, fd, prog_name, sizeof(prog_name)); 428 jsonw_string_field(json_wtr, "name", prog_name); 429 } 430 431 jsonw_name(json_wtr, "tag"); 432 jsonw_printf(json_wtr, "\"" BPF_TAG_FMT "\"", 433 info->tag[0], info->tag[1], info->tag[2], info->tag[3], 434 info->tag[4], info->tag[5], info->tag[6], info->tag[7]); 435 436 jsonw_bool_field(json_wtr, "gpl_compatible", info->gpl_compatible); 437 if (info->run_time_ns) { 438 jsonw_uint_field(json_wtr, "run_time_ns", info->run_time_ns); 439 jsonw_uint_field(json_wtr, "run_cnt", info->run_cnt); 440 } 441 if (info->recursion_misses) 442 jsonw_uint_field(json_wtr, "recursion_misses", info->recursion_misses); 443 } 444 445 static void print_prog_json(struct bpf_prog_info *info, int fd) 446 { 447 char *memlock; 448 449 jsonw_start_object(json_wtr); 450 print_prog_header_json(info, fd); 451 print_dev_json(info->ifindex, info->netns_dev, info->netns_ino); 452 453 if (info->load_time) { 454 char buf[32]; 455 456 print_boot_time(info->load_time, buf, sizeof(buf)); 457 458 /* Piggy back on load_time, since 0 uid is a valid one */ 459 jsonw_name(json_wtr, "loaded_at"); 460 jsonw_printf(json_wtr, "%s", buf); 461 jsonw_uint_field(json_wtr, "uid", info->created_by_uid); 462 } 463 464 jsonw_uint_field(json_wtr, "bytes_xlated", info->xlated_prog_len); 465 466 if (info->jited_prog_len) { 467 jsonw_bool_field(json_wtr, "jited", true); 468 jsonw_uint_field(json_wtr, "bytes_jited", info->jited_prog_len); 469 } else { 470 jsonw_bool_field(json_wtr, "jited", false); 471 } 472 473 memlock = get_fdinfo(fd, "memlock"); 474 if (memlock) 475 jsonw_int_field(json_wtr, "bytes_memlock", atoll(memlock)); 476 free(memlock); 477 478 if (info->nr_map_ids) 479 show_prog_maps(fd, info->nr_map_ids); 480 481 if (info->btf_id) 482 jsonw_int_field(json_wtr, "btf_id", info->btf_id); 483 484 if (!hashmap__empty(prog_table)) { 485 struct hashmap_entry *entry; 486 487 jsonw_name(json_wtr, "pinned"); 488 jsonw_start_array(json_wtr); 489 hashmap__for_each_key_entry(prog_table, entry, info->id) 490 jsonw_string(json_wtr, entry->pvalue); 491 jsonw_end_array(json_wtr); 492 } 493 494 emit_obj_refs_json(refs_table, info->id, json_wtr); 495 496 show_prog_metadata(fd, info->nr_map_ids); 497 498 jsonw_end_object(json_wtr); 499 } 500 501 static void print_prog_header_plain(struct bpf_prog_info *info, int fd) 502 { 503 const char *prog_type_str; 504 char prog_name[MAX_PROG_FULL_NAME]; 505 506 printf("%u: ", info->id); 507 prog_type_str = libbpf_bpf_prog_type_str(info->type); 508 if (prog_type_str) 509 printf("%s ", prog_type_str); 510 else 511 printf("type %u ", info->type); 512 513 if (*info->name) { 514 get_prog_full_name(info, fd, prog_name, sizeof(prog_name)); 515 printf("name %s ", prog_name); 516 } 517 518 printf("tag "); 519 fprint_hex(stdout, info->tag, BPF_TAG_SIZE, ""); 520 print_dev_plain(info->ifindex, info->netns_dev, info->netns_ino); 521 printf("%s", info->gpl_compatible ? " gpl" : ""); 522 if (info->run_time_ns) 523 printf(" run_time_ns %lld run_cnt %lld", 524 info->run_time_ns, info->run_cnt); 525 if (info->recursion_misses) 526 printf(" recursion_misses %lld", info->recursion_misses); 527 printf("\n"); 528 } 529 530 static void print_prog_plain(struct bpf_prog_info *info, int fd) 531 { 532 char *memlock; 533 534 print_prog_header_plain(info, fd); 535 536 if (info->load_time) { 537 char buf[32]; 538 539 print_boot_time(info->load_time, buf, sizeof(buf)); 540 541 /* Piggy back on load_time, since 0 uid is a valid one */ 542 printf("\tloaded_at %s uid %u\n", buf, info->created_by_uid); 543 } 544 545 printf("\txlated %uB", info->xlated_prog_len); 546 547 if (info->jited_prog_len) 548 printf(" jited %uB", info->jited_prog_len); 549 else 550 printf(" not jited"); 551 552 memlock = get_fdinfo(fd, "memlock"); 553 if (memlock) 554 printf(" memlock %sB", memlock); 555 free(memlock); 556 557 if (info->nr_map_ids) 558 show_prog_maps(fd, info->nr_map_ids); 559 560 if (!hashmap__empty(prog_table)) { 561 struct hashmap_entry *entry; 562 563 hashmap__for_each_key_entry(prog_table, entry, info->id) 564 printf("\n\tpinned %s", (char *)entry->pvalue); 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 (!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_arch(info->ifindex, info->netns_dev, 766 info->netns_ino, &disasm_opt); 767 if (!name) 768 goto exit_free; 769 } 770 771 if (info->nr_jited_func_lens && info->jited_func_lens) { 772 struct kernel_sym *sym = NULL; 773 struct bpf_func_info *record; 774 char sym_name[SYM_MAX_NAME]; 775 unsigned char *img = buf; 776 __u64 *ksyms = NULL; 777 __u32 *lens; 778 __u32 i; 779 if (info->nr_jited_ksyms) { 780 kernel_syms_load(&dd); 781 ksyms = u64_to_ptr(info->jited_ksyms); 782 } 783 784 if (json_output) 785 jsonw_start_array(json_wtr); 786 787 lens = u64_to_ptr(info->jited_func_lens); 788 for (i = 0; i < info->nr_jited_func_lens; i++) { 789 if (ksyms) { 790 sym = kernel_syms_search(&dd, ksyms[i]); 791 if (sym) 792 sprintf(sym_name, "%s", sym->name); 793 else 794 sprintf(sym_name, "0x%016llx", ksyms[i]); 795 } else { 796 strcpy(sym_name, "unknown"); 797 } 798 799 if (func_info) { 800 record = func_info + i * info->func_info_rec_size; 801 btf_dumper_type_only(btf, record->type_id, 802 func_sig, 803 sizeof(func_sig)); 804 } 805 806 if (json_output) { 807 jsonw_start_object(json_wtr); 808 if (func_info && func_sig[0] != '\0') { 809 jsonw_name(json_wtr, "proto"); 810 jsonw_string(json_wtr, func_sig); 811 } 812 jsonw_name(json_wtr, "name"); 813 jsonw_string(json_wtr, sym_name); 814 jsonw_name(json_wtr, "insns"); 815 } else { 816 if (func_info && func_sig[0] != '\0') 817 printf("%s:\n", func_sig); 818 printf("%s:\n", sym_name); 819 } 820 821 if (disasm_print_insn(img, lens[i], opcodes, 822 name, disasm_opt, btf, 823 prog_linfo, ksyms[i], i, 824 linum)) 825 goto exit_free; 826 827 img += lens[i]; 828 829 if (json_output) 830 jsonw_end_object(json_wtr); 831 else 832 printf("\n"); 833 } 834 835 if (json_output) 836 jsonw_end_array(json_wtr); 837 } else { 838 if (disasm_print_insn(buf, member_len, opcodes, name, 839 disasm_opt, btf, NULL, 0, 0, 840 false)) 841 goto exit_free; 842 } 843 } else if (visual) { 844 if (json_output) 845 jsonw_null(json_wtr); 846 else 847 dump_xlated_cfg(buf, member_len); 848 } else { 849 kernel_syms_load(&dd); 850 dd.nr_jited_ksyms = info->nr_jited_ksyms; 851 dd.jited_ksyms = u64_to_ptr(info->jited_ksyms); 852 dd.btf = btf; 853 dd.func_info = func_info; 854 dd.finfo_rec_size = info->func_info_rec_size; 855 dd.prog_linfo = prog_linfo; 856 857 if (json_output) 858 dump_xlated_json(&dd, buf, member_len, opcodes, 859 linum); 860 else 861 dump_xlated_plain(&dd, buf, member_len, opcodes, 862 linum); 863 kernel_syms_destroy(&dd); 864 } 865 866 err = 0; 867 868 exit_free: 869 btf__free(btf); 870 bpf_prog_linfo__free(prog_linfo); 871 return err; 872 } 873 874 static int do_dump(int argc, char **argv) 875 { 876 struct bpf_prog_info info; 877 __u32 info_len = sizeof(info); 878 size_t info_data_sz = 0; 879 void *info_data = NULL; 880 char *filepath = NULL; 881 bool opcodes = false; 882 bool visual = false; 883 enum dump_mode mode; 884 bool linum = false; 885 int nb_fds, i = 0; 886 int *fds = NULL; 887 int err = -1; 888 889 if (is_prefix(*argv, "jited")) { 890 if (disasm_init()) 891 return -1; 892 mode = DUMP_JITED; 893 } else if (is_prefix(*argv, "xlated")) { 894 mode = DUMP_XLATED; 895 } else { 896 p_err("expected 'xlated' or 'jited', got: %s", *argv); 897 return -1; 898 } 899 NEXT_ARG(); 900 901 if (argc < 2) 902 usage(); 903 904 fds = malloc(sizeof(int)); 905 if (!fds) { 906 p_err("mem alloc failed"); 907 return -1; 908 } 909 nb_fds = prog_parse_fds(&argc, &argv, &fds); 910 if (nb_fds < 1) 911 goto exit_free; 912 913 if (is_prefix(*argv, "file")) { 914 NEXT_ARG(); 915 if (!argc) { 916 p_err("expected file path"); 917 goto exit_close; 918 } 919 if (nb_fds > 1) { 920 p_err("several programs matched"); 921 goto exit_close; 922 } 923 924 filepath = *argv; 925 NEXT_ARG(); 926 } else if (is_prefix(*argv, "opcodes")) { 927 opcodes = true; 928 NEXT_ARG(); 929 } else if (is_prefix(*argv, "visual")) { 930 if (nb_fds > 1) { 931 p_err("several programs matched"); 932 goto exit_close; 933 } 934 935 visual = true; 936 NEXT_ARG(); 937 } else if (is_prefix(*argv, "linum")) { 938 linum = true; 939 NEXT_ARG(); 940 } 941 942 if (argc) { 943 usage(); 944 goto exit_close; 945 } 946 947 if (json_output && nb_fds > 1) 948 jsonw_start_array(json_wtr); /* root array */ 949 for (i = 0; i < nb_fds; i++) { 950 memset(&info, 0, sizeof(info)); 951 952 err = bpf_obj_get_info_by_fd(fds[i], &info, &info_len); 953 if (err) { 954 p_err("can't get prog info: %s", strerror(errno)); 955 break; 956 } 957 958 err = prep_prog_info(&info, mode, &info_data, &info_data_sz); 959 if (err) { 960 p_err("can't grow prog info_data"); 961 break; 962 } 963 964 err = bpf_obj_get_info_by_fd(fds[i], &info, &info_len); 965 if (err) { 966 p_err("can't get prog info: %s", strerror(errno)); 967 break; 968 } 969 970 if (json_output && nb_fds > 1) { 971 jsonw_start_object(json_wtr); /* prog object */ 972 print_prog_header_json(&info, fds[i]); 973 jsonw_name(json_wtr, "insns"); 974 } else if (nb_fds > 1) { 975 print_prog_header_plain(&info, fds[i]); 976 } 977 978 err = prog_dump(&info, mode, filepath, opcodes, visual, linum); 979 980 if (json_output && nb_fds > 1) 981 jsonw_end_object(json_wtr); /* prog object */ 982 else if (i != nb_fds - 1 && nb_fds > 1) 983 printf("\n"); 984 985 if (err) 986 break; 987 close(fds[i]); 988 } 989 if (json_output && nb_fds > 1) 990 jsonw_end_array(json_wtr); /* root array */ 991 992 exit_close: 993 for (; i < nb_fds; i++) 994 close(fds[i]); 995 exit_free: 996 free(info_data); 997 free(fds); 998 return err; 999 } 1000 1001 static int do_pin(int argc, char **argv) 1002 { 1003 int err; 1004 1005 err = do_pin_any(argc, argv, prog_parse_fd); 1006 if (!err && json_output) 1007 jsonw_null(json_wtr); 1008 return err; 1009 } 1010 1011 struct map_replace { 1012 int idx; 1013 int fd; 1014 char *name; 1015 }; 1016 1017 static int map_replace_compar(const void *p1, const void *p2) 1018 { 1019 const struct map_replace *a = p1, *b = p2; 1020 1021 return a->idx - b->idx; 1022 } 1023 1024 static int parse_attach_detach_args(int argc, char **argv, int *progfd, 1025 enum bpf_attach_type *attach_type, 1026 int *mapfd) 1027 { 1028 if (!REQ_ARGS(3)) 1029 return -EINVAL; 1030 1031 *progfd = prog_parse_fd(&argc, &argv); 1032 if (*progfd < 0) 1033 return *progfd; 1034 1035 *attach_type = parse_attach_type(*argv); 1036 if (*attach_type == __MAX_BPF_ATTACH_TYPE) { 1037 p_err("invalid attach/detach type"); 1038 return -EINVAL; 1039 } 1040 1041 if (*attach_type == BPF_FLOW_DISSECTOR) { 1042 *mapfd = 0; 1043 return 0; 1044 } 1045 1046 NEXT_ARG(); 1047 if (!REQ_ARGS(2)) 1048 return -EINVAL; 1049 1050 *mapfd = map_parse_fd(&argc, &argv); 1051 if (*mapfd < 0) 1052 return *mapfd; 1053 1054 return 0; 1055 } 1056 1057 static int do_attach(int argc, char **argv) 1058 { 1059 enum bpf_attach_type attach_type; 1060 int err, progfd; 1061 int mapfd; 1062 1063 err = parse_attach_detach_args(argc, argv, 1064 &progfd, &attach_type, &mapfd); 1065 if (err) 1066 return err; 1067 1068 err = bpf_prog_attach(progfd, mapfd, attach_type, 0); 1069 if (err) { 1070 p_err("failed prog attach to map"); 1071 return -EINVAL; 1072 } 1073 1074 if (json_output) 1075 jsonw_null(json_wtr); 1076 return 0; 1077 } 1078 1079 static int do_detach(int argc, char **argv) 1080 { 1081 enum bpf_attach_type attach_type; 1082 int err, progfd; 1083 int mapfd; 1084 1085 err = parse_attach_detach_args(argc, argv, 1086 &progfd, &attach_type, &mapfd); 1087 if (err) 1088 return err; 1089 1090 err = bpf_prog_detach2(progfd, mapfd, attach_type); 1091 if (err) { 1092 p_err("failed prog detach from map"); 1093 return -EINVAL; 1094 } 1095 1096 if (json_output) 1097 jsonw_null(json_wtr); 1098 return 0; 1099 } 1100 1101 static int check_single_stdin(char *file_data_in, char *file_ctx_in) 1102 { 1103 if (file_data_in && file_ctx_in && 1104 !strcmp(file_data_in, "-") && !strcmp(file_ctx_in, "-")) { 1105 p_err("cannot use standard input for both data_in and ctx_in"); 1106 return -1; 1107 } 1108 1109 return 0; 1110 } 1111 1112 static int get_run_data(const char *fname, void **data_ptr, unsigned int *size) 1113 { 1114 size_t block_size = 256; 1115 size_t buf_size = block_size; 1116 size_t nb_read = 0; 1117 void *tmp; 1118 FILE *f; 1119 1120 if (!fname) { 1121 *data_ptr = NULL; 1122 *size = 0; 1123 return 0; 1124 } 1125 1126 if (!strcmp(fname, "-")) 1127 f = stdin; 1128 else 1129 f = fopen(fname, "r"); 1130 if (!f) { 1131 p_err("failed to open %s: %s", fname, strerror(errno)); 1132 return -1; 1133 } 1134 1135 *data_ptr = malloc(block_size); 1136 if (!*data_ptr) { 1137 p_err("failed to allocate memory for data_in/ctx_in: %s", 1138 strerror(errno)); 1139 goto err_fclose; 1140 } 1141 1142 while ((nb_read += fread(*data_ptr + nb_read, 1, block_size, f))) { 1143 if (feof(f)) 1144 break; 1145 if (ferror(f)) { 1146 p_err("failed to read data_in/ctx_in from %s: %s", 1147 fname, strerror(errno)); 1148 goto err_free; 1149 } 1150 if (nb_read > buf_size - block_size) { 1151 if (buf_size == UINT32_MAX) { 1152 p_err("data_in/ctx_in is too long (max: %d)", 1153 UINT32_MAX); 1154 goto err_free; 1155 } 1156 /* No space for fread()-ing next chunk; realloc() */ 1157 buf_size *= 2; 1158 tmp = realloc(*data_ptr, buf_size); 1159 if (!tmp) { 1160 p_err("failed to reallocate data_in/ctx_in: %s", 1161 strerror(errno)); 1162 goto err_free; 1163 } 1164 *data_ptr = tmp; 1165 } 1166 } 1167 if (f != stdin) 1168 fclose(f); 1169 1170 *size = nb_read; 1171 return 0; 1172 1173 err_free: 1174 free(*data_ptr); 1175 *data_ptr = NULL; 1176 err_fclose: 1177 if (f != stdin) 1178 fclose(f); 1179 return -1; 1180 } 1181 1182 static void hex_print(void *data, unsigned int size, FILE *f) 1183 { 1184 size_t i, j; 1185 char c; 1186 1187 for (i = 0; i < size; i += 16) { 1188 /* Row offset */ 1189 fprintf(f, "%07zx\t", i); 1190 1191 /* Hexadecimal values */ 1192 for (j = i; j < i + 16 && j < size; j++) 1193 fprintf(f, "%02x%s", *(uint8_t *)(data + j), 1194 j % 2 ? " " : ""); 1195 for (; j < i + 16; j++) 1196 fprintf(f, " %s", j % 2 ? " " : ""); 1197 1198 /* ASCII values (if relevant), '.' otherwise */ 1199 fprintf(f, "| "); 1200 for (j = i; j < i + 16 && j < size; j++) { 1201 c = *(char *)(data + j); 1202 if (c < ' ' || c > '~') 1203 c = '.'; 1204 fprintf(f, "%c%s", c, j == i + 7 ? " " : ""); 1205 } 1206 1207 fprintf(f, "\n"); 1208 } 1209 } 1210 1211 static int 1212 print_run_output(void *data, unsigned int size, const char *fname, 1213 const char *json_key) 1214 { 1215 size_t nb_written; 1216 FILE *f; 1217 1218 if (!fname) 1219 return 0; 1220 1221 if (!strcmp(fname, "-")) { 1222 f = stdout; 1223 if (json_output) { 1224 jsonw_name(json_wtr, json_key); 1225 print_data_json(data, size); 1226 } else { 1227 hex_print(data, size, f); 1228 } 1229 return 0; 1230 } 1231 1232 f = fopen(fname, "w"); 1233 if (!f) { 1234 p_err("failed to open %s: %s", fname, strerror(errno)); 1235 return -1; 1236 } 1237 1238 nb_written = fwrite(data, 1, size, f); 1239 fclose(f); 1240 if (nb_written != size) { 1241 p_err("failed to write output data/ctx: %s", strerror(errno)); 1242 return -1; 1243 } 1244 1245 return 0; 1246 } 1247 1248 static int alloc_run_data(void **data_ptr, unsigned int size_out) 1249 { 1250 *data_ptr = calloc(size_out, 1); 1251 if (!*data_ptr) { 1252 p_err("failed to allocate memory for output data/ctx: %s", 1253 strerror(errno)); 1254 return -1; 1255 } 1256 1257 return 0; 1258 } 1259 1260 static int do_run(int argc, char **argv) 1261 { 1262 char *data_fname_in = NULL, *data_fname_out = NULL; 1263 char *ctx_fname_in = NULL, *ctx_fname_out = NULL; 1264 const unsigned int default_size = SZ_32K; 1265 void *data_in = NULL, *data_out = NULL; 1266 void *ctx_in = NULL, *ctx_out = NULL; 1267 unsigned int repeat = 1; 1268 int fd, err; 1269 LIBBPF_OPTS(bpf_test_run_opts, test_attr); 1270 1271 if (!REQ_ARGS(4)) 1272 return -1; 1273 1274 fd = prog_parse_fd(&argc, &argv); 1275 if (fd < 0) 1276 return -1; 1277 1278 while (argc) { 1279 if (detect_common_prefix(*argv, "data_in", "data_out", 1280 "data_size_out", NULL)) 1281 return -1; 1282 if (detect_common_prefix(*argv, "ctx_in", "ctx_out", 1283 "ctx_size_out", NULL)) 1284 return -1; 1285 1286 if (is_prefix(*argv, "data_in")) { 1287 NEXT_ARG(); 1288 if (!REQ_ARGS(1)) 1289 return -1; 1290 1291 data_fname_in = GET_ARG(); 1292 if (check_single_stdin(data_fname_in, ctx_fname_in)) 1293 return -1; 1294 } else if (is_prefix(*argv, "data_out")) { 1295 NEXT_ARG(); 1296 if (!REQ_ARGS(1)) 1297 return -1; 1298 1299 data_fname_out = GET_ARG(); 1300 } else if (is_prefix(*argv, "data_size_out")) { 1301 char *endptr; 1302 1303 NEXT_ARG(); 1304 if (!REQ_ARGS(1)) 1305 return -1; 1306 1307 test_attr.data_size_out = strtoul(*argv, &endptr, 0); 1308 if (*endptr) { 1309 p_err("can't parse %s as output data size", 1310 *argv); 1311 return -1; 1312 } 1313 NEXT_ARG(); 1314 } else if (is_prefix(*argv, "ctx_in")) { 1315 NEXT_ARG(); 1316 if (!REQ_ARGS(1)) 1317 return -1; 1318 1319 ctx_fname_in = GET_ARG(); 1320 if (check_single_stdin(data_fname_in, ctx_fname_in)) 1321 return -1; 1322 } else if (is_prefix(*argv, "ctx_out")) { 1323 NEXT_ARG(); 1324 if (!REQ_ARGS(1)) 1325 return -1; 1326 1327 ctx_fname_out = GET_ARG(); 1328 } else if (is_prefix(*argv, "ctx_size_out")) { 1329 char *endptr; 1330 1331 NEXT_ARG(); 1332 if (!REQ_ARGS(1)) 1333 return -1; 1334 1335 test_attr.ctx_size_out = strtoul(*argv, &endptr, 0); 1336 if (*endptr) { 1337 p_err("can't parse %s as output context size", 1338 *argv); 1339 return -1; 1340 } 1341 NEXT_ARG(); 1342 } else if (is_prefix(*argv, "repeat")) { 1343 char *endptr; 1344 1345 NEXT_ARG(); 1346 if (!REQ_ARGS(1)) 1347 return -1; 1348 1349 repeat = strtoul(*argv, &endptr, 0); 1350 if (*endptr) { 1351 p_err("can't parse %s as repeat number", 1352 *argv); 1353 return -1; 1354 } 1355 NEXT_ARG(); 1356 } else { 1357 p_err("expected no more arguments, 'data_in', 'data_out', 'data_size_out', 'ctx_in', 'ctx_out', 'ctx_size_out' or 'repeat', got: '%s'?", 1358 *argv); 1359 return -1; 1360 } 1361 } 1362 1363 err = get_run_data(data_fname_in, &data_in, &test_attr.data_size_in); 1364 if (err) 1365 return -1; 1366 1367 if (data_in) { 1368 if (!test_attr.data_size_out) 1369 test_attr.data_size_out = default_size; 1370 err = alloc_run_data(&data_out, test_attr.data_size_out); 1371 if (err) 1372 goto free_data_in; 1373 } 1374 1375 err = get_run_data(ctx_fname_in, &ctx_in, &test_attr.ctx_size_in); 1376 if (err) 1377 goto free_data_out; 1378 1379 if (ctx_in) { 1380 if (!test_attr.ctx_size_out) 1381 test_attr.ctx_size_out = default_size; 1382 err = alloc_run_data(&ctx_out, test_attr.ctx_size_out); 1383 if (err) 1384 goto free_ctx_in; 1385 } 1386 1387 test_attr.repeat = repeat; 1388 test_attr.data_in = data_in; 1389 test_attr.data_out = data_out; 1390 test_attr.ctx_in = ctx_in; 1391 test_attr.ctx_out = ctx_out; 1392 1393 err = bpf_prog_test_run_opts(fd, &test_attr); 1394 if (err) { 1395 p_err("failed to run program: %s", strerror(errno)); 1396 goto free_ctx_out; 1397 } 1398 1399 err = 0; 1400 1401 if (json_output) 1402 jsonw_start_object(json_wtr); /* root */ 1403 1404 /* Do not exit on errors occurring when printing output data/context, 1405 * we still want to print return value and duration for program run. 1406 */ 1407 if (test_attr.data_size_out) 1408 err += print_run_output(test_attr.data_out, 1409 test_attr.data_size_out, 1410 data_fname_out, "data_out"); 1411 if (test_attr.ctx_size_out) 1412 err += print_run_output(test_attr.ctx_out, 1413 test_attr.ctx_size_out, 1414 ctx_fname_out, "ctx_out"); 1415 1416 if (json_output) { 1417 jsonw_uint_field(json_wtr, "retval", test_attr.retval); 1418 jsonw_uint_field(json_wtr, "duration", test_attr.duration); 1419 jsonw_end_object(json_wtr); /* root */ 1420 } else { 1421 fprintf(stdout, "Return value: %u, duration%s: %uns\n", 1422 test_attr.retval, 1423 repeat > 1 ? " (average)" : "", test_attr.duration); 1424 } 1425 1426 free_ctx_out: 1427 free(ctx_out); 1428 free_ctx_in: 1429 free(ctx_in); 1430 free_data_out: 1431 free(data_out); 1432 free_data_in: 1433 free(data_in); 1434 1435 return err; 1436 } 1437 1438 static int 1439 get_prog_type_by_name(const char *name, enum bpf_prog_type *prog_type, 1440 enum bpf_attach_type *expected_attach_type) 1441 { 1442 libbpf_print_fn_t print_backup; 1443 int ret; 1444 1445 ret = libbpf_prog_type_by_name(name, prog_type, expected_attach_type); 1446 if (!ret) 1447 return ret; 1448 1449 /* libbpf_prog_type_by_name() failed, let's re-run with debug level */ 1450 print_backup = libbpf_set_print(print_all_levels); 1451 ret = libbpf_prog_type_by_name(name, prog_type, expected_attach_type); 1452 libbpf_set_print(print_backup); 1453 1454 return ret; 1455 } 1456 1457 static int 1458 auto_attach_program(struct bpf_program *prog, const char *path) 1459 { 1460 struct bpf_link *link; 1461 int err; 1462 1463 link = bpf_program__attach(prog); 1464 if (!link) { 1465 p_info("Program %s does not support autoattach, falling back to pinning", 1466 bpf_program__name(prog)); 1467 return bpf_obj_pin(bpf_program__fd(prog), path); 1468 } 1469 1470 err = bpf_link__pin(link, path); 1471 bpf_link__destroy(link); 1472 return err; 1473 } 1474 1475 static int pathname_concat(char *buf, size_t buf_sz, const char *path, const char *name) 1476 { 1477 int len; 1478 1479 len = snprintf(buf, buf_sz, "%s/%s", path, name); 1480 if (len < 0) 1481 return -EINVAL; 1482 if ((size_t)len >= buf_sz) 1483 return -ENAMETOOLONG; 1484 1485 return 0; 1486 } 1487 1488 static int 1489 auto_attach_programs(struct bpf_object *obj, const char *path) 1490 { 1491 struct bpf_program *prog; 1492 char buf[PATH_MAX]; 1493 int err; 1494 1495 bpf_object__for_each_program(prog, obj) { 1496 err = pathname_concat(buf, sizeof(buf), path, bpf_program__name(prog)); 1497 if (err) 1498 goto err_unpin_programs; 1499 1500 err = auto_attach_program(prog, buf); 1501 if (err) 1502 goto err_unpin_programs; 1503 } 1504 1505 return 0; 1506 1507 err_unpin_programs: 1508 while ((prog = bpf_object__prev_program(obj, prog))) { 1509 if (pathname_concat(buf, sizeof(buf), path, bpf_program__name(prog))) 1510 continue; 1511 1512 bpf_program__unpin(prog, buf); 1513 } 1514 1515 return err; 1516 } 1517 1518 static int load_with_options(int argc, char **argv, bool first_prog_only) 1519 { 1520 enum bpf_prog_type common_prog_type = BPF_PROG_TYPE_UNSPEC; 1521 DECLARE_LIBBPF_OPTS(bpf_object_open_opts, open_opts, 1522 .relaxed_maps = relaxed_maps, 1523 ); 1524 enum bpf_attach_type expected_attach_type; 1525 struct map_replace *map_replace = NULL; 1526 struct bpf_program *prog = NULL, *pos; 1527 unsigned int old_map_fds = 0; 1528 const char *pinmaps = NULL; 1529 bool auto_attach = false; 1530 struct bpf_object *obj; 1531 struct bpf_map *map; 1532 const char *pinfile; 1533 unsigned int i, j; 1534 __u32 ifindex = 0; 1535 const char *file; 1536 int idx, err; 1537 1538 1539 if (!REQ_ARGS(2)) 1540 return -1; 1541 file = GET_ARG(); 1542 pinfile = GET_ARG(); 1543 1544 while (argc) { 1545 if (is_prefix(*argv, "type")) { 1546 NEXT_ARG(); 1547 1548 if (common_prog_type != BPF_PROG_TYPE_UNSPEC) { 1549 p_err("program type already specified"); 1550 goto err_free_reuse_maps; 1551 } 1552 if (!REQ_ARGS(1)) 1553 goto err_free_reuse_maps; 1554 1555 err = libbpf_prog_type_by_name(*argv, &common_prog_type, 1556 &expected_attach_type); 1557 if (err < 0) { 1558 /* Put a '/' at the end of type to appease libbpf */ 1559 char *type = malloc(strlen(*argv) + 2); 1560 1561 if (!type) { 1562 p_err("mem alloc failed"); 1563 goto err_free_reuse_maps; 1564 } 1565 *type = 0; 1566 strcat(type, *argv); 1567 strcat(type, "/"); 1568 1569 err = get_prog_type_by_name(type, &common_prog_type, 1570 &expected_attach_type); 1571 free(type); 1572 if (err < 0) 1573 goto err_free_reuse_maps; 1574 } 1575 1576 NEXT_ARG(); 1577 } else if (is_prefix(*argv, "map")) { 1578 void *new_map_replace; 1579 char *endptr, *name; 1580 int fd; 1581 1582 NEXT_ARG(); 1583 1584 if (!REQ_ARGS(4)) 1585 goto err_free_reuse_maps; 1586 1587 if (is_prefix(*argv, "idx")) { 1588 NEXT_ARG(); 1589 1590 idx = strtoul(*argv, &endptr, 0); 1591 if (*endptr) { 1592 p_err("can't parse %s as IDX", *argv); 1593 goto err_free_reuse_maps; 1594 } 1595 name = NULL; 1596 } else if (is_prefix(*argv, "name")) { 1597 NEXT_ARG(); 1598 1599 name = *argv; 1600 idx = -1; 1601 } else { 1602 p_err("expected 'idx' or 'name', got: '%s'?", 1603 *argv); 1604 goto err_free_reuse_maps; 1605 } 1606 NEXT_ARG(); 1607 1608 fd = map_parse_fd(&argc, &argv); 1609 if (fd < 0) 1610 goto err_free_reuse_maps; 1611 1612 new_map_replace = libbpf_reallocarray(map_replace, 1613 old_map_fds + 1, 1614 sizeof(*map_replace)); 1615 if (!new_map_replace) { 1616 p_err("mem alloc failed"); 1617 goto err_free_reuse_maps; 1618 } 1619 map_replace = new_map_replace; 1620 1621 map_replace[old_map_fds].idx = idx; 1622 map_replace[old_map_fds].name = name; 1623 map_replace[old_map_fds].fd = fd; 1624 old_map_fds++; 1625 } else if (is_prefix(*argv, "dev")) { 1626 NEXT_ARG(); 1627 1628 if (ifindex) { 1629 p_err("offload device already specified"); 1630 goto err_free_reuse_maps; 1631 } 1632 if (!REQ_ARGS(1)) 1633 goto err_free_reuse_maps; 1634 1635 ifindex = if_nametoindex(*argv); 1636 if (!ifindex) { 1637 p_err("unrecognized netdevice '%s': %s", 1638 *argv, strerror(errno)); 1639 goto err_free_reuse_maps; 1640 } 1641 NEXT_ARG(); 1642 } else if (is_prefix(*argv, "pinmaps")) { 1643 NEXT_ARG(); 1644 1645 if (!REQ_ARGS(1)) 1646 goto err_free_reuse_maps; 1647 1648 pinmaps = GET_ARG(); 1649 } else if (is_prefix(*argv, "autoattach")) { 1650 auto_attach = true; 1651 NEXT_ARG(); 1652 } else { 1653 p_err("expected no more arguments, 'type', 'map' or 'dev', got: '%s'?", 1654 *argv); 1655 goto err_free_reuse_maps; 1656 } 1657 } 1658 1659 set_max_rlimit(); 1660 1661 if (verifier_logs) 1662 /* log_level1 + log_level2 + stats, but not stable UAPI */ 1663 open_opts.kernel_log_level = 1 + 2 + 4; 1664 1665 obj = bpf_object__open_file(file, &open_opts); 1666 if (!obj) { 1667 p_err("failed to open object file"); 1668 goto err_free_reuse_maps; 1669 } 1670 1671 bpf_object__for_each_program(pos, obj) { 1672 enum bpf_prog_type prog_type = common_prog_type; 1673 1674 if (prog_type == BPF_PROG_TYPE_UNSPEC) { 1675 const char *sec_name = bpf_program__section_name(pos); 1676 1677 err = get_prog_type_by_name(sec_name, &prog_type, 1678 &expected_attach_type); 1679 if (err < 0) 1680 goto err_close_obj; 1681 } 1682 1683 bpf_program__set_ifindex(pos, ifindex); 1684 bpf_program__set_type(pos, prog_type); 1685 bpf_program__set_expected_attach_type(pos, expected_attach_type); 1686 } 1687 1688 qsort(map_replace, old_map_fds, sizeof(*map_replace), 1689 map_replace_compar); 1690 1691 /* After the sort maps by name will be first on the list, because they 1692 * have idx == -1. Resolve them. 1693 */ 1694 j = 0; 1695 while (j < old_map_fds && map_replace[j].name) { 1696 i = 0; 1697 bpf_object__for_each_map(map, obj) { 1698 if (!strcmp(bpf_map__name(map), map_replace[j].name)) { 1699 map_replace[j].idx = i; 1700 break; 1701 } 1702 i++; 1703 } 1704 if (map_replace[j].idx == -1) { 1705 p_err("unable to find map '%s'", map_replace[j].name); 1706 goto err_close_obj; 1707 } 1708 j++; 1709 } 1710 /* Resort if any names were resolved */ 1711 if (j) 1712 qsort(map_replace, old_map_fds, sizeof(*map_replace), 1713 map_replace_compar); 1714 1715 /* Set ifindex and name reuse */ 1716 j = 0; 1717 idx = 0; 1718 bpf_object__for_each_map(map, obj) { 1719 if (bpf_map__type(map) != BPF_MAP_TYPE_PERF_EVENT_ARRAY) 1720 bpf_map__set_ifindex(map, ifindex); 1721 1722 if (j < old_map_fds && idx == map_replace[j].idx) { 1723 err = bpf_map__reuse_fd(map, map_replace[j++].fd); 1724 if (err) { 1725 p_err("unable to set up map reuse: %d", err); 1726 goto err_close_obj; 1727 } 1728 1729 /* Next reuse wants to apply to the same map */ 1730 if (j < old_map_fds && map_replace[j].idx == idx) { 1731 p_err("replacement for map idx %d specified more than once", 1732 idx); 1733 goto err_close_obj; 1734 } 1735 } 1736 1737 idx++; 1738 } 1739 if (j < old_map_fds) { 1740 p_err("map idx '%d' not used", map_replace[j].idx); 1741 goto err_close_obj; 1742 } 1743 1744 err = bpf_object__load(obj); 1745 if (err) { 1746 p_err("failed to load object file"); 1747 goto err_close_obj; 1748 } 1749 1750 err = mount_bpffs_for_pin(pinfile); 1751 if (err) 1752 goto err_close_obj; 1753 1754 if (first_prog_only) { 1755 prog = bpf_object__next_program(obj, NULL); 1756 if (!prog) { 1757 p_err("object file doesn't contain any bpf program"); 1758 goto err_close_obj; 1759 } 1760 1761 if (auto_attach) 1762 err = auto_attach_program(prog, pinfile); 1763 else 1764 err = bpf_obj_pin(bpf_program__fd(prog), pinfile); 1765 if (err) { 1766 p_err("failed to pin program %s", 1767 bpf_program__section_name(prog)); 1768 goto err_close_obj; 1769 } 1770 } else { 1771 if (auto_attach) 1772 err = auto_attach_programs(obj, pinfile); 1773 else 1774 err = bpf_object__pin_programs(obj, pinfile); 1775 if (err) { 1776 p_err("failed to pin all programs"); 1777 goto err_close_obj; 1778 } 1779 } 1780 1781 if (pinmaps) { 1782 err = bpf_object__pin_maps(obj, pinmaps); 1783 if (err) { 1784 p_err("failed to pin all maps"); 1785 goto err_unpin; 1786 } 1787 } 1788 1789 if (json_output) 1790 jsonw_null(json_wtr); 1791 1792 bpf_object__close(obj); 1793 for (i = 0; i < old_map_fds; i++) 1794 close(map_replace[i].fd); 1795 free(map_replace); 1796 1797 return 0; 1798 1799 err_unpin: 1800 if (first_prog_only) 1801 unlink(pinfile); 1802 else 1803 bpf_object__unpin_programs(obj, pinfile); 1804 err_close_obj: 1805 bpf_object__close(obj); 1806 err_free_reuse_maps: 1807 for (i = 0; i < old_map_fds; i++) 1808 close(map_replace[i].fd); 1809 free(map_replace); 1810 return -1; 1811 } 1812 1813 static int count_open_fds(void) 1814 { 1815 DIR *dp = opendir("/proc/self/fd"); 1816 struct dirent *de; 1817 int cnt = -3; 1818 1819 if (!dp) 1820 return -1; 1821 1822 while ((de = readdir(dp))) 1823 cnt++; 1824 1825 closedir(dp); 1826 return cnt; 1827 } 1828 1829 static int try_loader(struct gen_loader_opts *gen) 1830 { 1831 struct bpf_load_and_run_opts opts = {}; 1832 struct bpf_loader_ctx *ctx; 1833 int ctx_sz = sizeof(*ctx) + 64 * max(sizeof(struct bpf_map_desc), 1834 sizeof(struct bpf_prog_desc)); 1835 int log_buf_sz = (1u << 24) - 1; 1836 int err, fds_before, fd_delta; 1837 char *log_buf = NULL; 1838 1839 ctx = alloca(ctx_sz); 1840 memset(ctx, 0, ctx_sz); 1841 ctx->sz = ctx_sz; 1842 if (verifier_logs) { 1843 ctx->log_level = 1 + 2 + 4; 1844 ctx->log_size = log_buf_sz; 1845 log_buf = malloc(log_buf_sz); 1846 if (!log_buf) 1847 return -ENOMEM; 1848 ctx->log_buf = (long) log_buf; 1849 } 1850 opts.ctx = ctx; 1851 opts.data = gen->data; 1852 opts.data_sz = gen->data_sz; 1853 opts.insns = gen->insns; 1854 opts.insns_sz = gen->insns_sz; 1855 fds_before = count_open_fds(); 1856 err = bpf_load_and_run(&opts); 1857 fd_delta = count_open_fds() - fds_before; 1858 if (err < 0 || verifier_logs) { 1859 fprintf(stderr, "err %d\n%s\n%s", err, opts.errstr, log_buf); 1860 if (fd_delta && err < 0) 1861 fprintf(stderr, "loader prog leaked %d FDs\n", 1862 fd_delta); 1863 } 1864 free(log_buf); 1865 return err; 1866 } 1867 1868 static int do_loader(int argc, char **argv) 1869 { 1870 DECLARE_LIBBPF_OPTS(bpf_object_open_opts, open_opts); 1871 DECLARE_LIBBPF_OPTS(gen_loader_opts, gen); 1872 struct bpf_object *obj; 1873 const char *file; 1874 int err = 0; 1875 1876 if (!REQ_ARGS(1)) 1877 return -1; 1878 file = GET_ARG(); 1879 1880 if (verifier_logs) 1881 /* log_level1 + log_level2 + stats, but not stable UAPI */ 1882 open_opts.kernel_log_level = 1 + 2 + 4; 1883 1884 obj = bpf_object__open_file(file, &open_opts); 1885 if (!obj) { 1886 p_err("failed to open object file"); 1887 goto err_close_obj; 1888 } 1889 1890 err = bpf_object__gen_loader(obj, &gen); 1891 if (err) 1892 goto err_close_obj; 1893 1894 err = bpf_object__load(obj); 1895 if (err) { 1896 p_err("failed to load object file"); 1897 goto err_close_obj; 1898 } 1899 1900 if (verifier_logs) { 1901 struct dump_data dd = {}; 1902 1903 kernel_syms_load(&dd); 1904 dump_xlated_plain(&dd, (void *)gen.insns, gen.insns_sz, false, false); 1905 kernel_syms_destroy(&dd); 1906 } 1907 err = try_loader(&gen); 1908 err_close_obj: 1909 bpf_object__close(obj); 1910 return err; 1911 } 1912 1913 static int do_load(int argc, char **argv) 1914 { 1915 if (use_loader) 1916 return do_loader(argc, argv); 1917 return load_with_options(argc, argv, true); 1918 } 1919 1920 static int do_loadall(int argc, char **argv) 1921 { 1922 return load_with_options(argc, argv, false); 1923 } 1924 1925 #ifdef BPFTOOL_WITHOUT_SKELETONS 1926 1927 static int do_profile(int argc, char **argv) 1928 { 1929 p_err("bpftool prog profile command is not supported. Please build bpftool with clang >= 10.0.0"); 1930 return 0; 1931 } 1932 1933 #else /* BPFTOOL_WITHOUT_SKELETONS */ 1934 1935 #include "profiler.skel.h" 1936 1937 struct profile_metric { 1938 const char *name; 1939 struct bpf_perf_event_value val; 1940 struct perf_event_attr attr; 1941 bool selected; 1942 1943 /* calculate ratios like instructions per cycle */ 1944 const int ratio_metric; /* 0 for N/A, 1 for index 0 (cycles) */ 1945 const char *ratio_desc; 1946 const float ratio_mul; 1947 } metrics[] = { 1948 { 1949 .name = "cycles", 1950 .attr = { 1951 .type = PERF_TYPE_HARDWARE, 1952 .config = PERF_COUNT_HW_CPU_CYCLES, 1953 .exclude_user = 1, 1954 }, 1955 }, 1956 { 1957 .name = "instructions", 1958 .attr = { 1959 .type = PERF_TYPE_HARDWARE, 1960 .config = PERF_COUNT_HW_INSTRUCTIONS, 1961 .exclude_user = 1, 1962 }, 1963 .ratio_metric = 1, 1964 .ratio_desc = "insns per cycle", 1965 .ratio_mul = 1.0, 1966 }, 1967 { 1968 .name = "l1d_loads", 1969 .attr = { 1970 .type = PERF_TYPE_HW_CACHE, 1971 .config = 1972 PERF_COUNT_HW_CACHE_L1D | 1973 (PERF_COUNT_HW_CACHE_OP_READ << 8) | 1974 (PERF_COUNT_HW_CACHE_RESULT_ACCESS << 16), 1975 .exclude_user = 1, 1976 }, 1977 }, 1978 { 1979 .name = "llc_misses", 1980 .attr = { 1981 .type = PERF_TYPE_HW_CACHE, 1982 .config = 1983 PERF_COUNT_HW_CACHE_LL | 1984 (PERF_COUNT_HW_CACHE_OP_READ << 8) | 1985 (PERF_COUNT_HW_CACHE_RESULT_MISS << 16), 1986 .exclude_user = 1 1987 }, 1988 .ratio_metric = 2, 1989 .ratio_desc = "LLC misses per million insns", 1990 .ratio_mul = 1e6, 1991 }, 1992 { 1993 .name = "itlb_misses", 1994 .attr = { 1995 .type = PERF_TYPE_HW_CACHE, 1996 .config = 1997 PERF_COUNT_HW_CACHE_ITLB | 1998 (PERF_COUNT_HW_CACHE_OP_READ << 8) | 1999 (PERF_COUNT_HW_CACHE_RESULT_MISS << 16), 2000 .exclude_user = 1 2001 }, 2002 .ratio_metric = 2, 2003 .ratio_desc = "itlb misses per million insns", 2004 .ratio_mul = 1e6, 2005 }, 2006 { 2007 .name = "dtlb_misses", 2008 .attr = { 2009 .type = PERF_TYPE_HW_CACHE, 2010 .config = 2011 PERF_COUNT_HW_CACHE_DTLB | 2012 (PERF_COUNT_HW_CACHE_OP_READ << 8) | 2013 (PERF_COUNT_HW_CACHE_RESULT_MISS << 16), 2014 .exclude_user = 1 2015 }, 2016 .ratio_metric = 2, 2017 .ratio_desc = "dtlb misses per million insns", 2018 .ratio_mul = 1e6, 2019 }, 2020 }; 2021 2022 static __u64 profile_total_count; 2023 2024 #define MAX_NUM_PROFILE_METRICS 4 2025 2026 static int profile_parse_metrics(int argc, char **argv) 2027 { 2028 unsigned int metric_cnt; 2029 int selected_cnt = 0; 2030 unsigned int i; 2031 2032 metric_cnt = ARRAY_SIZE(metrics); 2033 2034 while (argc > 0) { 2035 for (i = 0; i < metric_cnt; i++) { 2036 if (is_prefix(argv[0], metrics[i].name)) { 2037 if (!metrics[i].selected) 2038 selected_cnt++; 2039 metrics[i].selected = true; 2040 break; 2041 } 2042 } 2043 if (i == metric_cnt) { 2044 p_err("unknown metric %s", argv[0]); 2045 return -1; 2046 } 2047 NEXT_ARG(); 2048 } 2049 if (selected_cnt > MAX_NUM_PROFILE_METRICS) { 2050 p_err("too many (%d) metrics, please specify no more than %d metrics at at time", 2051 selected_cnt, MAX_NUM_PROFILE_METRICS); 2052 return -1; 2053 } 2054 return selected_cnt; 2055 } 2056 2057 static void profile_read_values(struct profiler_bpf *obj) 2058 { 2059 __u32 m, cpu, num_cpu = obj->rodata->num_cpu; 2060 int reading_map_fd, count_map_fd; 2061 __u64 counts[num_cpu]; 2062 __u32 key = 0; 2063 int err; 2064 2065 reading_map_fd = bpf_map__fd(obj->maps.accum_readings); 2066 count_map_fd = bpf_map__fd(obj->maps.counts); 2067 if (reading_map_fd < 0 || count_map_fd < 0) { 2068 p_err("failed to get fd for map"); 2069 return; 2070 } 2071 2072 err = bpf_map_lookup_elem(count_map_fd, &key, counts); 2073 if (err) { 2074 p_err("failed to read count_map: %s", strerror(errno)); 2075 return; 2076 } 2077 2078 profile_total_count = 0; 2079 for (cpu = 0; cpu < num_cpu; cpu++) 2080 profile_total_count += counts[cpu]; 2081 2082 for (m = 0; m < ARRAY_SIZE(metrics); m++) { 2083 struct bpf_perf_event_value values[num_cpu]; 2084 2085 if (!metrics[m].selected) 2086 continue; 2087 2088 err = bpf_map_lookup_elem(reading_map_fd, &key, values); 2089 if (err) { 2090 p_err("failed to read reading_map: %s", 2091 strerror(errno)); 2092 return; 2093 } 2094 for (cpu = 0; cpu < num_cpu; cpu++) { 2095 metrics[m].val.counter += values[cpu].counter; 2096 metrics[m].val.enabled += values[cpu].enabled; 2097 metrics[m].val.running += values[cpu].running; 2098 } 2099 key++; 2100 } 2101 } 2102 2103 static void profile_print_readings_json(void) 2104 { 2105 __u32 m; 2106 2107 jsonw_start_array(json_wtr); 2108 for (m = 0; m < ARRAY_SIZE(metrics); m++) { 2109 if (!metrics[m].selected) 2110 continue; 2111 jsonw_start_object(json_wtr); 2112 jsonw_string_field(json_wtr, "metric", metrics[m].name); 2113 jsonw_lluint_field(json_wtr, "run_cnt", profile_total_count); 2114 jsonw_lluint_field(json_wtr, "value", metrics[m].val.counter); 2115 jsonw_lluint_field(json_wtr, "enabled", metrics[m].val.enabled); 2116 jsonw_lluint_field(json_wtr, "running", metrics[m].val.running); 2117 2118 jsonw_end_object(json_wtr); 2119 } 2120 jsonw_end_array(json_wtr); 2121 } 2122 2123 static void profile_print_readings_plain(void) 2124 { 2125 __u32 m; 2126 2127 printf("\n%18llu %-20s\n", profile_total_count, "run_cnt"); 2128 for (m = 0; m < ARRAY_SIZE(metrics); m++) { 2129 struct bpf_perf_event_value *val = &metrics[m].val; 2130 int r; 2131 2132 if (!metrics[m].selected) 2133 continue; 2134 printf("%18llu %-20s", val->counter, metrics[m].name); 2135 2136 r = metrics[m].ratio_metric - 1; 2137 if (r >= 0 && metrics[r].selected && 2138 metrics[r].val.counter > 0) { 2139 printf("# %8.2f %-30s", 2140 val->counter * metrics[m].ratio_mul / 2141 metrics[r].val.counter, 2142 metrics[m].ratio_desc); 2143 } else { 2144 printf("%-41s", ""); 2145 } 2146 2147 if (val->enabled > val->running) 2148 printf("(%4.2f%%)", 2149 val->running * 100.0 / val->enabled); 2150 printf("\n"); 2151 } 2152 } 2153 2154 static void profile_print_readings(void) 2155 { 2156 if (json_output) 2157 profile_print_readings_json(); 2158 else 2159 profile_print_readings_plain(); 2160 } 2161 2162 static char *profile_target_name(int tgt_fd) 2163 { 2164 struct bpf_func_info func_info; 2165 struct bpf_prog_info info = {}; 2166 __u32 info_len = sizeof(info); 2167 const struct btf_type *t; 2168 __u32 func_info_rec_size; 2169 struct btf *btf = NULL; 2170 char *name = NULL; 2171 int err; 2172 2173 err = bpf_obj_get_info_by_fd(tgt_fd, &info, &info_len); 2174 if (err) { 2175 p_err("failed to bpf_obj_get_info_by_fd for prog FD %d", tgt_fd); 2176 goto out; 2177 } 2178 2179 if (info.btf_id == 0) { 2180 p_err("prog FD %d doesn't have valid btf", tgt_fd); 2181 goto out; 2182 } 2183 2184 func_info_rec_size = info.func_info_rec_size; 2185 if (info.nr_func_info == 0) { 2186 p_err("bpf_obj_get_info_by_fd for prog FD %d found 0 func_info", tgt_fd); 2187 goto out; 2188 } 2189 2190 memset(&info, 0, sizeof(info)); 2191 info.nr_func_info = 1; 2192 info.func_info_rec_size = func_info_rec_size; 2193 info.func_info = ptr_to_u64(&func_info); 2194 2195 err = bpf_obj_get_info_by_fd(tgt_fd, &info, &info_len); 2196 if (err) { 2197 p_err("failed to get func_info for prog FD %d", tgt_fd); 2198 goto out; 2199 } 2200 2201 btf = btf__load_from_kernel_by_id(info.btf_id); 2202 if (!btf) { 2203 p_err("failed to load btf for prog FD %d", tgt_fd); 2204 goto out; 2205 } 2206 2207 t = btf__type_by_id(btf, func_info.type_id); 2208 if (!t) { 2209 p_err("btf %d doesn't have type %d", 2210 info.btf_id, func_info.type_id); 2211 goto out; 2212 } 2213 name = strdup(btf__name_by_offset(btf, t->name_off)); 2214 out: 2215 btf__free(btf); 2216 return name; 2217 } 2218 2219 static struct profiler_bpf *profile_obj; 2220 static int profile_tgt_fd = -1; 2221 static char *profile_tgt_name; 2222 static int *profile_perf_events; 2223 static int profile_perf_event_cnt; 2224 2225 static void profile_close_perf_events(struct profiler_bpf *obj) 2226 { 2227 int i; 2228 2229 for (i = profile_perf_event_cnt - 1; i >= 0; i--) 2230 close(profile_perf_events[i]); 2231 2232 free(profile_perf_events); 2233 profile_perf_event_cnt = 0; 2234 } 2235 2236 static int profile_open_perf_event(int mid, int cpu, int map_fd) 2237 { 2238 int pmu_fd; 2239 2240 pmu_fd = syscall(__NR_perf_event_open, &metrics[mid].attr, 2241 -1 /*pid*/, cpu, -1 /*group_fd*/, 0); 2242 if (pmu_fd < 0) { 2243 if (errno == ENODEV) { 2244 p_info("cpu %d may be offline, skip %s profiling.", 2245 cpu, metrics[mid].name); 2246 profile_perf_event_cnt++; 2247 return 0; 2248 } 2249 return -1; 2250 } 2251 2252 if (bpf_map_update_elem(map_fd, 2253 &profile_perf_event_cnt, 2254 &pmu_fd, BPF_ANY) || 2255 ioctl(pmu_fd, PERF_EVENT_IOC_ENABLE, 0)) { 2256 close(pmu_fd); 2257 return -1; 2258 } 2259 2260 profile_perf_events[profile_perf_event_cnt++] = pmu_fd; 2261 return 0; 2262 } 2263 2264 static int profile_open_perf_events(struct profiler_bpf *obj) 2265 { 2266 unsigned int cpu, m; 2267 int map_fd; 2268 2269 profile_perf_events = calloc( 2270 sizeof(int), obj->rodata->num_cpu * obj->rodata->num_metric); 2271 if (!profile_perf_events) { 2272 p_err("failed to allocate memory for perf_event array: %s", 2273 strerror(errno)); 2274 return -1; 2275 } 2276 map_fd = bpf_map__fd(obj->maps.events); 2277 if (map_fd < 0) { 2278 p_err("failed to get fd for events map"); 2279 return -1; 2280 } 2281 2282 for (m = 0; m < ARRAY_SIZE(metrics); m++) { 2283 if (!metrics[m].selected) 2284 continue; 2285 for (cpu = 0; cpu < obj->rodata->num_cpu; cpu++) { 2286 if (profile_open_perf_event(m, cpu, map_fd)) { 2287 p_err("failed to create event %s on cpu %d", 2288 metrics[m].name, cpu); 2289 return -1; 2290 } 2291 } 2292 } 2293 return 0; 2294 } 2295 2296 static void profile_print_and_cleanup(void) 2297 { 2298 profile_close_perf_events(profile_obj); 2299 profile_read_values(profile_obj); 2300 profile_print_readings(); 2301 profiler_bpf__destroy(profile_obj); 2302 2303 close(profile_tgt_fd); 2304 free(profile_tgt_name); 2305 } 2306 2307 static void int_exit(int signo) 2308 { 2309 profile_print_and_cleanup(); 2310 exit(0); 2311 } 2312 2313 static int do_profile(int argc, char **argv) 2314 { 2315 int num_metric, num_cpu, err = -1; 2316 struct bpf_program *prog; 2317 unsigned long duration; 2318 char *endptr; 2319 2320 /* we at least need two args for the prog and one metric */ 2321 if (!REQ_ARGS(3)) 2322 return -EINVAL; 2323 2324 /* parse target fd */ 2325 profile_tgt_fd = prog_parse_fd(&argc, &argv); 2326 if (profile_tgt_fd < 0) { 2327 p_err("failed to parse fd"); 2328 return -1; 2329 } 2330 2331 /* parse profiling optional duration */ 2332 if (argc > 2 && is_prefix(argv[0], "duration")) { 2333 NEXT_ARG(); 2334 duration = strtoul(*argv, &endptr, 0); 2335 if (*endptr) 2336 usage(); 2337 NEXT_ARG(); 2338 } else { 2339 duration = UINT_MAX; 2340 } 2341 2342 num_metric = profile_parse_metrics(argc, argv); 2343 if (num_metric <= 0) 2344 goto out; 2345 2346 num_cpu = libbpf_num_possible_cpus(); 2347 if (num_cpu <= 0) { 2348 p_err("failed to identify number of CPUs"); 2349 goto out; 2350 } 2351 2352 profile_obj = profiler_bpf__open(); 2353 if (!profile_obj) { 2354 p_err("failed to open and/or load BPF object"); 2355 goto out; 2356 } 2357 2358 profile_obj->rodata->num_cpu = num_cpu; 2359 profile_obj->rodata->num_metric = num_metric; 2360 2361 /* adjust map sizes */ 2362 bpf_map__set_max_entries(profile_obj->maps.events, num_metric * num_cpu); 2363 bpf_map__set_max_entries(profile_obj->maps.fentry_readings, num_metric); 2364 bpf_map__set_max_entries(profile_obj->maps.accum_readings, num_metric); 2365 bpf_map__set_max_entries(profile_obj->maps.counts, 1); 2366 2367 /* change target name */ 2368 profile_tgt_name = profile_target_name(profile_tgt_fd); 2369 if (!profile_tgt_name) 2370 goto out; 2371 2372 bpf_object__for_each_program(prog, profile_obj->obj) { 2373 err = bpf_program__set_attach_target(prog, profile_tgt_fd, 2374 profile_tgt_name); 2375 if (err) { 2376 p_err("failed to set attach target\n"); 2377 goto out; 2378 } 2379 } 2380 2381 set_max_rlimit(); 2382 err = profiler_bpf__load(profile_obj); 2383 if (err) { 2384 p_err("failed to load profile_obj"); 2385 goto out; 2386 } 2387 2388 err = profile_open_perf_events(profile_obj); 2389 if (err) 2390 goto out; 2391 2392 err = profiler_bpf__attach(profile_obj); 2393 if (err) { 2394 p_err("failed to attach profile_obj"); 2395 goto out; 2396 } 2397 signal(SIGINT, int_exit); 2398 2399 sleep(duration); 2400 profile_print_and_cleanup(); 2401 return 0; 2402 2403 out: 2404 profile_close_perf_events(profile_obj); 2405 if (profile_obj) 2406 profiler_bpf__destroy(profile_obj); 2407 close(profile_tgt_fd); 2408 free(profile_tgt_name); 2409 return err; 2410 } 2411 2412 #endif /* BPFTOOL_WITHOUT_SKELETONS */ 2413 2414 static int do_help(int argc, char **argv) 2415 { 2416 if (json_output) { 2417 jsonw_null(json_wtr); 2418 return 0; 2419 } 2420 2421 fprintf(stderr, 2422 "Usage: %1$s %2$s { show | list } [PROG]\n" 2423 " %1$s %2$s dump xlated PROG [{ file FILE | opcodes | visual | linum }]\n" 2424 " %1$s %2$s dump jited PROG [{ file FILE | opcodes | linum }]\n" 2425 " %1$s %2$s pin PROG FILE\n" 2426 " %1$s %2$s { load | loadall } OBJ PATH \\\n" 2427 " [type TYPE] [dev NAME] \\\n" 2428 " [map { idx IDX | name NAME } MAP]\\\n" 2429 " [pinmaps MAP_DIR]\n" 2430 " [autoattach]\n" 2431 " %1$s %2$s attach PROG ATTACH_TYPE [MAP]\n" 2432 " %1$s %2$s detach PROG ATTACH_TYPE [MAP]\n" 2433 " %1$s %2$s run PROG \\\n" 2434 " data_in FILE \\\n" 2435 " [data_out FILE [data_size_out L]] \\\n" 2436 " [ctx_in FILE [ctx_out FILE [ctx_size_out M]]] \\\n" 2437 " [repeat N]\n" 2438 " %1$s %2$s profile PROG [duration DURATION] METRICs\n" 2439 " %1$s %2$s tracelog\n" 2440 " %1$s %2$s help\n" 2441 "\n" 2442 " " HELP_SPEC_MAP "\n" 2443 " " HELP_SPEC_PROGRAM "\n" 2444 " TYPE := { socket | kprobe | kretprobe | classifier | action |\n" 2445 " tracepoint | raw_tracepoint | xdp | perf_event | cgroup/skb |\n" 2446 " cgroup/sock | cgroup/dev | lwt_in | lwt_out | lwt_xmit |\n" 2447 " lwt_seg6local | sockops | sk_skb | sk_msg | lirc_mode2 |\n" 2448 " sk_reuseport | flow_dissector | cgroup/sysctl |\n" 2449 " cgroup/bind4 | cgroup/bind6 | cgroup/post_bind4 |\n" 2450 " cgroup/post_bind6 | cgroup/connect4 | cgroup/connect6 |\n" 2451 " cgroup/getpeername4 | cgroup/getpeername6 |\n" 2452 " cgroup/getsockname4 | cgroup/getsockname6 | cgroup/sendmsg4 |\n" 2453 " cgroup/sendmsg6 | cgroup/recvmsg4 | cgroup/recvmsg6 |\n" 2454 " cgroup/getsockopt | cgroup/setsockopt | cgroup/sock_release |\n" 2455 " struct_ops | fentry | fexit | freplace | sk_lookup }\n" 2456 " ATTACH_TYPE := { sk_msg_verdict | sk_skb_verdict | sk_skb_stream_verdict |\n" 2457 " sk_skb_stream_parser | flow_dissector }\n" 2458 " METRIC := { cycles | instructions | l1d_loads | llc_misses | itlb_misses | dtlb_misses }\n" 2459 " " HELP_SPEC_OPTIONS " |\n" 2460 " {-f|--bpffs} | {-m|--mapcompat} | {-n|--nomount} |\n" 2461 " {-L|--use-loader} }\n" 2462 "", 2463 bin_name, argv[-2]); 2464 2465 return 0; 2466 } 2467 2468 static const struct cmd cmds[] = { 2469 { "show", do_show }, 2470 { "list", do_show }, 2471 { "help", do_help }, 2472 { "dump", do_dump }, 2473 { "pin", do_pin }, 2474 { "load", do_load }, 2475 { "loadall", do_loadall }, 2476 { "attach", do_attach }, 2477 { "detach", do_detach }, 2478 { "tracelog", do_tracelog }, 2479 { "run", do_run }, 2480 { "profile", do_profile }, 2481 { 0 } 2482 }; 2483 2484 int do_prog(int argc, char **argv) 2485 { 2486 return cmd_select(cmds, argc, argv, do_help); 2487 } 2488