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_prog_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_prog_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_prog_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_map_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_prog_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 { 844 kernel_syms_load(&dd); 845 dd.nr_jited_ksyms = info->nr_jited_ksyms; 846 dd.jited_ksyms = u64_to_ptr(info->jited_ksyms); 847 dd.btf = btf; 848 dd.func_info = func_info; 849 dd.finfo_rec_size = info->func_info_rec_size; 850 dd.prog_linfo = prog_linfo; 851 852 if (json_output) 853 dump_xlated_json(&dd, buf, member_len, opcodes, linum); 854 else if (visual) 855 dump_xlated_cfg(&dd, buf, member_len, opcodes, linum); 856 else 857 dump_xlated_plain(&dd, buf, member_len, opcodes, linum); 858 kernel_syms_destroy(&dd); 859 } 860 861 err = 0; 862 863 exit_free: 864 btf__free(btf); 865 bpf_prog_linfo__free(prog_linfo); 866 return err; 867 } 868 869 static int do_dump(int argc, char **argv) 870 { 871 struct bpf_prog_info info; 872 __u32 info_len = sizeof(info); 873 size_t info_data_sz = 0; 874 void *info_data = NULL; 875 char *filepath = NULL; 876 bool opcodes = false; 877 bool visual = false; 878 enum dump_mode mode; 879 bool linum = false; 880 int nb_fds, i = 0; 881 int *fds = NULL; 882 int err = -1; 883 884 if (is_prefix(*argv, "jited")) { 885 if (disasm_init()) 886 return -1; 887 mode = DUMP_JITED; 888 } else if (is_prefix(*argv, "xlated")) { 889 mode = DUMP_XLATED; 890 } else { 891 p_err("expected 'xlated' or 'jited', got: %s", *argv); 892 return -1; 893 } 894 NEXT_ARG(); 895 896 if (argc < 2) 897 usage(); 898 899 fds = malloc(sizeof(int)); 900 if (!fds) { 901 p_err("mem alloc failed"); 902 return -1; 903 } 904 nb_fds = prog_parse_fds(&argc, &argv, &fds); 905 if (nb_fds < 1) 906 goto exit_free; 907 908 while (argc) { 909 if (is_prefix(*argv, "file")) { 910 NEXT_ARG(); 911 if (!argc) { 912 p_err("expected file path"); 913 goto exit_close; 914 } 915 if (nb_fds > 1) { 916 p_err("several programs matched"); 917 goto exit_close; 918 } 919 920 filepath = *argv; 921 NEXT_ARG(); 922 } else if (is_prefix(*argv, "opcodes")) { 923 opcodes = true; 924 NEXT_ARG(); 925 } else if (is_prefix(*argv, "visual")) { 926 if (nb_fds > 1) { 927 p_err("several programs matched"); 928 goto exit_close; 929 } 930 931 visual = true; 932 NEXT_ARG(); 933 } else if (is_prefix(*argv, "linum")) { 934 linum = true; 935 NEXT_ARG(); 936 } else { 937 usage(); 938 goto exit_close; 939 } 940 } 941 942 if (filepath && (opcodes || visual || linum)) { 943 p_err("'file' is not compatible with 'opcodes', 'visual', or 'linum'"); 944 goto exit_close; 945 } 946 if (json_output && visual) { 947 p_err("'visual' is not compatible with JSON output"); 948 goto exit_close; 949 } 950 951 if (json_output && nb_fds > 1) 952 jsonw_start_array(json_wtr); /* root array */ 953 for (i = 0; i < nb_fds; i++) { 954 memset(&info, 0, sizeof(info)); 955 956 err = bpf_prog_get_info_by_fd(fds[i], &info, &info_len); 957 if (err) { 958 p_err("can't get prog info: %s", strerror(errno)); 959 break; 960 } 961 962 err = prep_prog_info(&info, mode, &info_data, &info_data_sz); 963 if (err) { 964 p_err("can't grow prog info_data"); 965 break; 966 } 967 968 err = bpf_prog_get_info_by_fd(fds[i], &info, &info_len); 969 if (err) { 970 p_err("can't get prog info: %s", strerror(errno)); 971 break; 972 } 973 974 if (json_output && nb_fds > 1) { 975 jsonw_start_object(json_wtr); /* prog object */ 976 print_prog_header_json(&info, fds[i]); 977 jsonw_name(json_wtr, "insns"); 978 } else if (nb_fds > 1) { 979 print_prog_header_plain(&info, fds[i]); 980 } 981 982 err = prog_dump(&info, mode, filepath, opcodes, visual, linum); 983 984 if (json_output && nb_fds > 1) 985 jsonw_end_object(json_wtr); /* prog object */ 986 else if (i != nb_fds - 1 && nb_fds > 1) 987 printf("\n"); 988 989 if (err) 990 break; 991 close(fds[i]); 992 } 993 if (json_output && nb_fds > 1) 994 jsonw_end_array(json_wtr); /* root array */ 995 996 exit_close: 997 for (; i < nb_fds; i++) 998 close(fds[i]); 999 exit_free: 1000 free(info_data); 1001 free(fds); 1002 return err; 1003 } 1004 1005 static int do_pin(int argc, char **argv) 1006 { 1007 int err; 1008 1009 err = do_pin_any(argc, argv, prog_parse_fd); 1010 if (!err && json_output) 1011 jsonw_null(json_wtr); 1012 return err; 1013 } 1014 1015 struct map_replace { 1016 int idx; 1017 int fd; 1018 char *name; 1019 }; 1020 1021 static int map_replace_compar(const void *p1, const void *p2) 1022 { 1023 const struct map_replace *a = p1, *b = p2; 1024 1025 return a->idx - b->idx; 1026 } 1027 1028 static int parse_attach_detach_args(int argc, char **argv, int *progfd, 1029 enum bpf_attach_type *attach_type, 1030 int *mapfd) 1031 { 1032 if (!REQ_ARGS(3)) 1033 return -EINVAL; 1034 1035 *progfd = prog_parse_fd(&argc, &argv); 1036 if (*progfd < 0) 1037 return *progfd; 1038 1039 *attach_type = parse_attach_type(*argv); 1040 if (*attach_type == __MAX_BPF_ATTACH_TYPE) { 1041 p_err("invalid attach/detach type"); 1042 return -EINVAL; 1043 } 1044 1045 if (*attach_type == BPF_FLOW_DISSECTOR) { 1046 *mapfd = 0; 1047 return 0; 1048 } 1049 1050 NEXT_ARG(); 1051 if (!REQ_ARGS(2)) 1052 return -EINVAL; 1053 1054 *mapfd = map_parse_fd(&argc, &argv); 1055 if (*mapfd < 0) 1056 return *mapfd; 1057 1058 return 0; 1059 } 1060 1061 static int do_attach(int argc, char **argv) 1062 { 1063 enum bpf_attach_type attach_type; 1064 int err, progfd; 1065 int mapfd; 1066 1067 err = parse_attach_detach_args(argc, argv, 1068 &progfd, &attach_type, &mapfd); 1069 if (err) 1070 return err; 1071 1072 err = bpf_prog_attach(progfd, mapfd, attach_type, 0); 1073 if (err) { 1074 p_err("failed prog attach to map"); 1075 return -EINVAL; 1076 } 1077 1078 if (json_output) 1079 jsonw_null(json_wtr); 1080 return 0; 1081 } 1082 1083 static int do_detach(int argc, char **argv) 1084 { 1085 enum bpf_attach_type attach_type; 1086 int err, progfd; 1087 int mapfd; 1088 1089 err = parse_attach_detach_args(argc, argv, 1090 &progfd, &attach_type, &mapfd); 1091 if (err) 1092 return err; 1093 1094 err = bpf_prog_detach2(progfd, mapfd, attach_type); 1095 if (err) { 1096 p_err("failed prog detach from map"); 1097 return -EINVAL; 1098 } 1099 1100 if (json_output) 1101 jsonw_null(json_wtr); 1102 return 0; 1103 } 1104 1105 static int check_single_stdin(char *file_data_in, char *file_ctx_in) 1106 { 1107 if (file_data_in && file_ctx_in && 1108 !strcmp(file_data_in, "-") && !strcmp(file_ctx_in, "-")) { 1109 p_err("cannot use standard input for both data_in and ctx_in"); 1110 return -1; 1111 } 1112 1113 return 0; 1114 } 1115 1116 static int get_run_data(const char *fname, void **data_ptr, unsigned int *size) 1117 { 1118 size_t block_size = 256; 1119 size_t buf_size = block_size; 1120 size_t nb_read = 0; 1121 void *tmp; 1122 FILE *f; 1123 1124 if (!fname) { 1125 *data_ptr = NULL; 1126 *size = 0; 1127 return 0; 1128 } 1129 1130 if (!strcmp(fname, "-")) 1131 f = stdin; 1132 else 1133 f = fopen(fname, "r"); 1134 if (!f) { 1135 p_err("failed to open %s: %s", fname, strerror(errno)); 1136 return -1; 1137 } 1138 1139 *data_ptr = malloc(block_size); 1140 if (!*data_ptr) { 1141 p_err("failed to allocate memory for data_in/ctx_in: %s", 1142 strerror(errno)); 1143 goto err_fclose; 1144 } 1145 1146 while ((nb_read += fread(*data_ptr + nb_read, 1, block_size, f))) { 1147 if (feof(f)) 1148 break; 1149 if (ferror(f)) { 1150 p_err("failed to read data_in/ctx_in from %s: %s", 1151 fname, strerror(errno)); 1152 goto err_free; 1153 } 1154 if (nb_read > buf_size - block_size) { 1155 if (buf_size == UINT32_MAX) { 1156 p_err("data_in/ctx_in is too long (max: %d)", 1157 UINT32_MAX); 1158 goto err_free; 1159 } 1160 /* No space for fread()-ing next chunk; realloc() */ 1161 buf_size *= 2; 1162 tmp = realloc(*data_ptr, buf_size); 1163 if (!tmp) { 1164 p_err("failed to reallocate data_in/ctx_in: %s", 1165 strerror(errno)); 1166 goto err_free; 1167 } 1168 *data_ptr = tmp; 1169 } 1170 } 1171 if (f != stdin) 1172 fclose(f); 1173 1174 *size = nb_read; 1175 return 0; 1176 1177 err_free: 1178 free(*data_ptr); 1179 *data_ptr = NULL; 1180 err_fclose: 1181 if (f != stdin) 1182 fclose(f); 1183 return -1; 1184 } 1185 1186 static void hex_print(void *data, unsigned int size, FILE *f) 1187 { 1188 size_t i, j; 1189 char c; 1190 1191 for (i = 0; i < size; i += 16) { 1192 /* Row offset */ 1193 fprintf(f, "%07zx\t", i); 1194 1195 /* Hexadecimal values */ 1196 for (j = i; j < i + 16 && j < size; j++) 1197 fprintf(f, "%02x%s", *(uint8_t *)(data + j), 1198 j % 2 ? " " : ""); 1199 for (; j < i + 16; j++) 1200 fprintf(f, " %s", j % 2 ? " " : ""); 1201 1202 /* ASCII values (if relevant), '.' otherwise */ 1203 fprintf(f, "| "); 1204 for (j = i; j < i + 16 && j < size; j++) { 1205 c = *(char *)(data + j); 1206 if (c < ' ' || c > '~') 1207 c = '.'; 1208 fprintf(f, "%c%s", c, j == i + 7 ? " " : ""); 1209 } 1210 1211 fprintf(f, "\n"); 1212 } 1213 } 1214 1215 static int 1216 print_run_output(void *data, unsigned int size, const char *fname, 1217 const char *json_key) 1218 { 1219 size_t nb_written; 1220 FILE *f; 1221 1222 if (!fname) 1223 return 0; 1224 1225 if (!strcmp(fname, "-")) { 1226 f = stdout; 1227 if (json_output) { 1228 jsonw_name(json_wtr, json_key); 1229 print_data_json(data, size); 1230 } else { 1231 hex_print(data, size, f); 1232 } 1233 return 0; 1234 } 1235 1236 f = fopen(fname, "w"); 1237 if (!f) { 1238 p_err("failed to open %s: %s", fname, strerror(errno)); 1239 return -1; 1240 } 1241 1242 nb_written = fwrite(data, 1, size, f); 1243 fclose(f); 1244 if (nb_written != size) { 1245 p_err("failed to write output data/ctx: %s", strerror(errno)); 1246 return -1; 1247 } 1248 1249 return 0; 1250 } 1251 1252 static int alloc_run_data(void **data_ptr, unsigned int size_out) 1253 { 1254 *data_ptr = calloc(size_out, 1); 1255 if (!*data_ptr) { 1256 p_err("failed to allocate memory for output data/ctx: %s", 1257 strerror(errno)); 1258 return -1; 1259 } 1260 1261 return 0; 1262 } 1263 1264 static int do_run(int argc, char **argv) 1265 { 1266 char *data_fname_in = NULL, *data_fname_out = NULL; 1267 char *ctx_fname_in = NULL, *ctx_fname_out = NULL; 1268 const unsigned int default_size = SZ_32K; 1269 void *data_in = NULL, *data_out = NULL; 1270 void *ctx_in = NULL, *ctx_out = NULL; 1271 unsigned int repeat = 1; 1272 int fd, err; 1273 LIBBPF_OPTS(bpf_test_run_opts, test_attr); 1274 1275 if (!REQ_ARGS(4)) 1276 return -1; 1277 1278 fd = prog_parse_fd(&argc, &argv); 1279 if (fd < 0) 1280 return -1; 1281 1282 while (argc) { 1283 if (detect_common_prefix(*argv, "data_in", "data_out", 1284 "data_size_out", NULL)) 1285 return -1; 1286 if (detect_common_prefix(*argv, "ctx_in", "ctx_out", 1287 "ctx_size_out", NULL)) 1288 return -1; 1289 1290 if (is_prefix(*argv, "data_in")) { 1291 NEXT_ARG(); 1292 if (!REQ_ARGS(1)) 1293 return -1; 1294 1295 data_fname_in = GET_ARG(); 1296 if (check_single_stdin(data_fname_in, ctx_fname_in)) 1297 return -1; 1298 } else if (is_prefix(*argv, "data_out")) { 1299 NEXT_ARG(); 1300 if (!REQ_ARGS(1)) 1301 return -1; 1302 1303 data_fname_out = GET_ARG(); 1304 } else if (is_prefix(*argv, "data_size_out")) { 1305 char *endptr; 1306 1307 NEXT_ARG(); 1308 if (!REQ_ARGS(1)) 1309 return -1; 1310 1311 test_attr.data_size_out = strtoul(*argv, &endptr, 0); 1312 if (*endptr) { 1313 p_err("can't parse %s as output data size", 1314 *argv); 1315 return -1; 1316 } 1317 NEXT_ARG(); 1318 } else if (is_prefix(*argv, "ctx_in")) { 1319 NEXT_ARG(); 1320 if (!REQ_ARGS(1)) 1321 return -1; 1322 1323 ctx_fname_in = GET_ARG(); 1324 if (check_single_stdin(data_fname_in, ctx_fname_in)) 1325 return -1; 1326 } else if (is_prefix(*argv, "ctx_out")) { 1327 NEXT_ARG(); 1328 if (!REQ_ARGS(1)) 1329 return -1; 1330 1331 ctx_fname_out = GET_ARG(); 1332 } else if (is_prefix(*argv, "ctx_size_out")) { 1333 char *endptr; 1334 1335 NEXT_ARG(); 1336 if (!REQ_ARGS(1)) 1337 return -1; 1338 1339 test_attr.ctx_size_out = strtoul(*argv, &endptr, 0); 1340 if (*endptr) { 1341 p_err("can't parse %s as output context size", 1342 *argv); 1343 return -1; 1344 } 1345 NEXT_ARG(); 1346 } else if (is_prefix(*argv, "repeat")) { 1347 char *endptr; 1348 1349 NEXT_ARG(); 1350 if (!REQ_ARGS(1)) 1351 return -1; 1352 1353 repeat = strtoul(*argv, &endptr, 0); 1354 if (*endptr) { 1355 p_err("can't parse %s as repeat number", 1356 *argv); 1357 return -1; 1358 } 1359 NEXT_ARG(); 1360 } else { 1361 p_err("expected no more arguments, 'data_in', 'data_out', 'data_size_out', 'ctx_in', 'ctx_out', 'ctx_size_out' or 'repeat', got: '%s'?", 1362 *argv); 1363 return -1; 1364 } 1365 } 1366 1367 err = get_run_data(data_fname_in, &data_in, &test_attr.data_size_in); 1368 if (err) 1369 return -1; 1370 1371 if (data_in) { 1372 if (!test_attr.data_size_out) 1373 test_attr.data_size_out = default_size; 1374 err = alloc_run_data(&data_out, test_attr.data_size_out); 1375 if (err) 1376 goto free_data_in; 1377 } 1378 1379 err = get_run_data(ctx_fname_in, &ctx_in, &test_attr.ctx_size_in); 1380 if (err) 1381 goto free_data_out; 1382 1383 if (ctx_in) { 1384 if (!test_attr.ctx_size_out) 1385 test_attr.ctx_size_out = default_size; 1386 err = alloc_run_data(&ctx_out, test_attr.ctx_size_out); 1387 if (err) 1388 goto free_ctx_in; 1389 } 1390 1391 test_attr.repeat = repeat; 1392 test_attr.data_in = data_in; 1393 test_attr.data_out = data_out; 1394 test_attr.ctx_in = ctx_in; 1395 test_attr.ctx_out = ctx_out; 1396 1397 err = bpf_prog_test_run_opts(fd, &test_attr); 1398 if (err) { 1399 p_err("failed to run program: %s", strerror(errno)); 1400 goto free_ctx_out; 1401 } 1402 1403 err = 0; 1404 1405 if (json_output) 1406 jsonw_start_object(json_wtr); /* root */ 1407 1408 /* Do not exit on errors occurring when printing output data/context, 1409 * we still want to print return value and duration for program run. 1410 */ 1411 if (test_attr.data_size_out) 1412 err += print_run_output(test_attr.data_out, 1413 test_attr.data_size_out, 1414 data_fname_out, "data_out"); 1415 if (test_attr.ctx_size_out) 1416 err += print_run_output(test_attr.ctx_out, 1417 test_attr.ctx_size_out, 1418 ctx_fname_out, "ctx_out"); 1419 1420 if (json_output) { 1421 jsonw_uint_field(json_wtr, "retval", test_attr.retval); 1422 jsonw_uint_field(json_wtr, "duration", test_attr.duration); 1423 jsonw_end_object(json_wtr); /* root */ 1424 } else { 1425 fprintf(stdout, "Return value: %u, duration%s: %uns\n", 1426 test_attr.retval, 1427 repeat > 1 ? " (average)" : "", test_attr.duration); 1428 } 1429 1430 free_ctx_out: 1431 free(ctx_out); 1432 free_ctx_in: 1433 free(ctx_in); 1434 free_data_out: 1435 free(data_out); 1436 free_data_in: 1437 free(data_in); 1438 1439 return err; 1440 } 1441 1442 static int 1443 get_prog_type_by_name(const char *name, enum bpf_prog_type *prog_type, 1444 enum bpf_attach_type *expected_attach_type) 1445 { 1446 libbpf_print_fn_t print_backup; 1447 int ret; 1448 1449 ret = libbpf_prog_type_by_name(name, prog_type, expected_attach_type); 1450 if (!ret) 1451 return ret; 1452 1453 /* libbpf_prog_type_by_name() failed, let's re-run with debug level */ 1454 print_backup = libbpf_set_print(print_all_levels); 1455 ret = libbpf_prog_type_by_name(name, prog_type, expected_attach_type); 1456 libbpf_set_print(print_backup); 1457 1458 return ret; 1459 } 1460 1461 static int 1462 auto_attach_program(struct bpf_program *prog, const char *path) 1463 { 1464 struct bpf_link *link; 1465 int err; 1466 1467 link = bpf_program__attach(prog); 1468 if (!link) { 1469 p_info("Program %s does not support autoattach, falling back to pinning", 1470 bpf_program__name(prog)); 1471 return bpf_obj_pin(bpf_program__fd(prog), path); 1472 } 1473 1474 err = bpf_link__pin(link, path); 1475 bpf_link__destroy(link); 1476 return err; 1477 } 1478 1479 static int 1480 auto_attach_programs(struct bpf_object *obj, const char *path) 1481 { 1482 struct bpf_program *prog; 1483 char buf[PATH_MAX]; 1484 int err; 1485 1486 bpf_object__for_each_program(prog, obj) { 1487 err = pathname_concat(buf, sizeof(buf), path, bpf_program__name(prog)); 1488 if (err) 1489 goto err_unpin_programs; 1490 1491 err = auto_attach_program(prog, buf); 1492 if (err) 1493 goto err_unpin_programs; 1494 } 1495 1496 return 0; 1497 1498 err_unpin_programs: 1499 while ((prog = bpf_object__prev_program(obj, prog))) { 1500 if (pathname_concat(buf, sizeof(buf), path, bpf_program__name(prog))) 1501 continue; 1502 1503 bpf_program__unpin(prog, buf); 1504 } 1505 1506 return err; 1507 } 1508 1509 static int load_with_options(int argc, char **argv, bool first_prog_only) 1510 { 1511 enum bpf_prog_type common_prog_type = BPF_PROG_TYPE_UNSPEC; 1512 DECLARE_LIBBPF_OPTS(bpf_object_open_opts, open_opts, 1513 .relaxed_maps = relaxed_maps, 1514 ); 1515 enum bpf_attach_type expected_attach_type; 1516 struct map_replace *map_replace = NULL; 1517 struct bpf_program *prog = NULL, *pos; 1518 unsigned int old_map_fds = 0; 1519 const char *pinmaps = NULL; 1520 __u32 xdpmeta_ifindex = 0; 1521 __u32 offload_ifindex = 0; 1522 bool auto_attach = false; 1523 struct bpf_object *obj; 1524 struct bpf_map *map; 1525 const char *pinfile; 1526 unsigned int i, j; 1527 const char *file; 1528 int idx, err; 1529 1530 1531 if (!REQ_ARGS(2)) 1532 return -1; 1533 file = GET_ARG(); 1534 pinfile = GET_ARG(); 1535 1536 while (argc) { 1537 if (is_prefix(*argv, "type")) { 1538 NEXT_ARG(); 1539 1540 if (common_prog_type != BPF_PROG_TYPE_UNSPEC) { 1541 p_err("program type already specified"); 1542 goto err_free_reuse_maps; 1543 } 1544 if (!REQ_ARGS(1)) 1545 goto err_free_reuse_maps; 1546 1547 err = libbpf_prog_type_by_name(*argv, &common_prog_type, 1548 &expected_attach_type); 1549 if (err < 0) { 1550 /* Put a '/' at the end of type to appease libbpf */ 1551 char *type = malloc(strlen(*argv) + 2); 1552 1553 if (!type) { 1554 p_err("mem alloc failed"); 1555 goto err_free_reuse_maps; 1556 } 1557 *type = 0; 1558 strcat(type, *argv); 1559 strcat(type, "/"); 1560 1561 err = get_prog_type_by_name(type, &common_prog_type, 1562 &expected_attach_type); 1563 free(type); 1564 if (err < 0) 1565 goto err_free_reuse_maps; 1566 } 1567 1568 NEXT_ARG(); 1569 } else if (is_prefix(*argv, "map")) { 1570 void *new_map_replace; 1571 char *endptr, *name; 1572 int fd; 1573 1574 NEXT_ARG(); 1575 1576 if (!REQ_ARGS(4)) 1577 goto err_free_reuse_maps; 1578 1579 if (is_prefix(*argv, "idx")) { 1580 NEXT_ARG(); 1581 1582 idx = strtoul(*argv, &endptr, 0); 1583 if (*endptr) { 1584 p_err("can't parse %s as IDX", *argv); 1585 goto err_free_reuse_maps; 1586 } 1587 name = NULL; 1588 } else if (is_prefix(*argv, "name")) { 1589 NEXT_ARG(); 1590 1591 name = *argv; 1592 idx = -1; 1593 } else { 1594 p_err("expected 'idx' or 'name', got: '%s'?", 1595 *argv); 1596 goto err_free_reuse_maps; 1597 } 1598 NEXT_ARG(); 1599 1600 fd = map_parse_fd(&argc, &argv); 1601 if (fd < 0) 1602 goto err_free_reuse_maps; 1603 1604 new_map_replace = libbpf_reallocarray(map_replace, 1605 old_map_fds + 1, 1606 sizeof(*map_replace)); 1607 if (!new_map_replace) { 1608 p_err("mem alloc failed"); 1609 goto err_free_reuse_maps; 1610 } 1611 map_replace = new_map_replace; 1612 1613 map_replace[old_map_fds].idx = idx; 1614 map_replace[old_map_fds].name = name; 1615 map_replace[old_map_fds].fd = fd; 1616 old_map_fds++; 1617 } else if (is_prefix(*argv, "dev")) { 1618 p_info("Warning: 'bpftool prog load [...] dev <ifname>' syntax is deprecated.\n" 1619 "Going further, please use 'offload_dev <ifname>' to offload program to device.\n" 1620 "For applications using XDP hints only, use 'xdpmeta_dev <ifname>'."); 1621 goto offload_dev; 1622 } else if (is_prefix(*argv, "offload_dev")) { 1623 offload_dev: 1624 NEXT_ARG(); 1625 1626 if (offload_ifindex) { 1627 p_err("offload_dev already specified"); 1628 goto err_free_reuse_maps; 1629 } else if (xdpmeta_ifindex) { 1630 p_err("xdpmeta_dev and offload_dev are mutually exclusive"); 1631 goto err_free_reuse_maps; 1632 } 1633 if (!REQ_ARGS(1)) 1634 goto err_free_reuse_maps; 1635 1636 offload_ifindex = if_nametoindex(*argv); 1637 if (!offload_ifindex) { 1638 p_err("unrecognized netdevice '%s': %s", 1639 *argv, strerror(errno)); 1640 goto err_free_reuse_maps; 1641 } 1642 NEXT_ARG(); 1643 } else if (is_prefix(*argv, "xdpmeta_dev")) { 1644 NEXT_ARG(); 1645 1646 if (xdpmeta_ifindex) { 1647 p_err("xdpmeta_dev already specified"); 1648 goto err_free_reuse_maps; 1649 } else if (offload_ifindex) { 1650 p_err("xdpmeta_dev and offload_dev are mutually exclusive"); 1651 goto err_free_reuse_maps; 1652 } 1653 if (!REQ_ARGS(1)) 1654 goto err_free_reuse_maps; 1655 1656 xdpmeta_ifindex = if_nametoindex(*argv); 1657 if (!xdpmeta_ifindex) { 1658 p_err("unrecognized netdevice '%s': %s", 1659 *argv, strerror(errno)); 1660 goto err_free_reuse_maps; 1661 } 1662 NEXT_ARG(); 1663 } else if (is_prefix(*argv, "pinmaps")) { 1664 NEXT_ARG(); 1665 1666 if (!REQ_ARGS(1)) 1667 goto err_free_reuse_maps; 1668 1669 pinmaps = GET_ARG(); 1670 } else if (is_prefix(*argv, "autoattach")) { 1671 auto_attach = true; 1672 NEXT_ARG(); 1673 } else { 1674 p_err("expected no more arguments, 'type', 'map' or 'dev', got: '%s'?", 1675 *argv); 1676 goto err_free_reuse_maps; 1677 } 1678 } 1679 1680 set_max_rlimit(); 1681 1682 if (verifier_logs) 1683 /* log_level1 + log_level2 + stats, but not stable UAPI */ 1684 open_opts.kernel_log_level = 1 + 2 + 4; 1685 1686 obj = bpf_object__open_file(file, &open_opts); 1687 if (!obj) { 1688 p_err("failed to open object file"); 1689 goto err_free_reuse_maps; 1690 } 1691 1692 bpf_object__for_each_program(pos, obj) { 1693 enum bpf_prog_type prog_type = common_prog_type; 1694 1695 if (prog_type == BPF_PROG_TYPE_UNSPEC) { 1696 const char *sec_name = bpf_program__section_name(pos); 1697 1698 err = get_prog_type_by_name(sec_name, &prog_type, 1699 &expected_attach_type); 1700 if (err < 0) 1701 goto err_close_obj; 1702 } 1703 1704 if (prog_type == BPF_PROG_TYPE_XDP && xdpmeta_ifindex) { 1705 bpf_program__set_flags(pos, BPF_F_XDP_DEV_BOUND_ONLY); 1706 bpf_program__set_ifindex(pos, xdpmeta_ifindex); 1707 } else { 1708 bpf_program__set_ifindex(pos, offload_ifindex); 1709 } 1710 if (bpf_program__type(pos) != prog_type) 1711 bpf_program__set_type(pos, prog_type); 1712 bpf_program__set_expected_attach_type(pos, expected_attach_type); 1713 } 1714 1715 qsort(map_replace, old_map_fds, sizeof(*map_replace), 1716 map_replace_compar); 1717 1718 /* After the sort maps by name will be first on the list, because they 1719 * have idx == -1. Resolve them. 1720 */ 1721 j = 0; 1722 while (j < old_map_fds && map_replace[j].name) { 1723 i = 0; 1724 bpf_object__for_each_map(map, obj) { 1725 if (!strcmp(bpf_map__name(map), map_replace[j].name)) { 1726 map_replace[j].idx = i; 1727 break; 1728 } 1729 i++; 1730 } 1731 if (map_replace[j].idx == -1) { 1732 p_err("unable to find map '%s'", map_replace[j].name); 1733 goto err_close_obj; 1734 } 1735 j++; 1736 } 1737 /* Resort if any names were resolved */ 1738 if (j) 1739 qsort(map_replace, old_map_fds, sizeof(*map_replace), 1740 map_replace_compar); 1741 1742 /* Set ifindex and name reuse */ 1743 j = 0; 1744 idx = 0; 1745 bpf_object__for_each_map(map, obj) { 1746 if (bpf_map__type(map) != BPF_MAP_TYPE_PERF_EVENT_ARRAY) 1747 bpf_map__set_ifindex(map, offload_ifindex); 1748 1749 if (j < old_map_fds && idx == map_replace[j].idx) { 1750 err = bpf_map__reuse_fd(map, map_replace[j++].fd); 1751 if (err) { 1752 p_err("unable to set up map reuse: %d", err); 1753 goto err_close_obj; 1754 } 1755 1756 /* Next reuse wants to apply to the same map */ 1757 if (j < old_map_fds && map_replace[j].idx == idx) { 1758 p_err("replacement for map idx %d specified more than once", 1759 idx); 1760 goto err_close_obj; 1761 } 1762 } 1763 1764 idx++; 1765 } 1766 if (j < old_map_fds) { 1767 p_err("map idx '%d' not used", map_replace[j].idx); 1768 goto err_close_obj; 1769 } 1770 1771 err = bpf_object__load(obj); 1772 if (err) { 1773 p_err("failed to load object file"); 1774 goto err_close_obj; 1775 } 1776 1777 if (first_prog_only) 1778 err = mount_bpffs_for_file(pinfile); 1779 else 1780 err = create_and_mount_bpffs_dir(pinfile); 1781 if (err) 1782 goto err_close_obj; 1783 1784 if (first_prog_only) { 1785 prog = bpf_object__next_program(obj, NULL); 1786 if (!prog) { 1787 p_err("object file doesn't contain any bpf program"); 1788 goto err_close_obj; 1789 } 1790 1791 if (auto_attach) 1792 err = auto_attach_program(prog, pinfile); 1793 else 1794 err = bpf_obj_pin(bpf_program__fd(prog), pinfile); 1795 if (err) { 1796 p_err("failed to pin program %s", 1797 bpf_program__section_name(prog)); 1798 goto err_close_obj; 1799 } 1800 } else { 1801 if (auto_attach) 1802 err = auto_attach_programs(obj, pinfile); 1803 else 1804 err = bpf_object__pin_programs(obj, pinfile); 1805 if (err) { 1806 p_err("failed to pin all programs"); 1807 goto err_close_obj; 1808 } 1809 } 1810 1811 if (pinmaps) { 1812 err = bpf_object__pin_maps(obj, pinmaps); 1813 if (err) { 1814 p_err("failed to pin all maps"); 1815 goto err_unpin; 1816 } 1817 } 1818 1819 if (json_output) 1820 jsonw_null(json_wtr); 1821 1822 bpf_object__close(obj); 1823 for (i = 0; i < old_map_fds; i++) 1824 close(map_replace[i].fd); 1825 free(map_replace); 1826 1827 return 0; 1828 1829 err_unpin: 1830 if (first_prog_only) 1831 unlink(pinfile); 1832 else 1833 bpf_object__unpin_programs(obj, pinfile); 1834 err_close_obj: 1835 bpf_object__close(obj); 1836 err_free_reuse_maps: 1837 for (i = 0; i < old_map_fds; i++) 1838 close(map_replace[i].fd); 1839 free(map_replace); 1840 return -1; 1841 } 1842 1843 static int count_open_fds(void) 1844 { 1845 DIR *dp = opendir("/proc/self/fd"); 1846 struct dirent *de; 1847 int cnt = -3; 1848 1849 if (!dp) 1850 return -1; 1851 1852 while ((de = readdir(dp))) 1853 cnt++; 1854 1855 closedir(dp); 1856 return cnt; 1857 } 1858 1859 static int try_loader(struct gen_loader_opts *gen) 1860 { 1861 struct bpf_load_and_run_opts opts = {}; 1862 struct bpf_loader_ctx *ctx; 1863 int ctx_sz = sizeof(*ctx) + 64 * max(sizeof(struct bpf_map_desc), 1864 sizeof(struct bpf_prog_desc)); 1865 int log_buf_sz = (1u << 24) - 1; 1866 int err, fds_before, fd_delta; 1867 char *log_buf = NULL; 1868 1869 ctx = alloca(ctx_sz); 1870 memset(ctx, 0, ctx_sz); 1871 ctx->sz = ctx_sz; 1872 if (verifier_logs) { 1873 ctx->log_level = 1 + 2 + 4; 1874 ctx->log_size = log_buf_sz; 1875 log_buf = malloc(log_buf_sz); 1876 if (!log_buf) 1877 return -ENOMEM; 1878 ctx->log_buf = (long) log_buf; 1879 } 1880 opts.ctx = ctx; 1881 opts.data = gen->data; 1882 opts.data_sz = gen->data_sz; 1883 opts.insns = gen->insns; 1884 opts.insns_sz = gen->insns_sz; 1885 fds_before = count_open_fds(); 1886 err = bpf_load_and_run(&opts); 1887 fd_delta = count_open_fds() - fds_before; 1888 if (err < 0 || verifier_logs) { 1889 fprintf(stderr, "err %d\n%s\n%s", err, opts.errstr, log_buf); 1890 if (fd_delta && err < 0) 1891 fprintf(stderr, "loader prog leaked %d FDs\n", 1892 fd_delta); 1893 } 1894 free(log_buf); 1895 return err; 1896 } 1897 1898 static int do_loader(int argc, char **argv) 1899 { 1900 DECLARE_LIBBPF_OPTS(bpf_object_open_opts, open_opts); 1901 DECLARE_LIBBPF_OPTS(gen_loader_opts, gen); 1902 struct bpf_object *obj; 1903 const char *file; 1904 int err = 0; 1905 1906 if (!REQ_ARGS(1)) 1907 return -1; 1908 file = GET_ARG(); 1909 1910 if (verifier_logs) 1911 /* log_level1 + log_level2 + stats, but not stable UAPI */ 1912 open_opts.kernel_log_level = 1 + 2 + 4; 1913 1914 obj = bpf_object__open_file(file, &open_opts); 1915 if (!obj) { 1916 p_err("failed to open object file"); 1917 goto err_close_obj; 1918 } 1919 1920 err = bpf_object__gen_loader(obj, &gen); 1921 if (err) 1922 goto err_close_obj; 1923 1924 err = bpf_object__load(obj); 1925 if (err) { 1926 p_err("failed to load object file"); 1927 goto err_close_obj; 1928 } 1929 1930 if (verifier_logs) { 1931 struct dump_data dd = {}; 1932 1933 kernel_syms_load(&dd); 1934 dump_xlated_plain(&dd, (void *)gen.insns, gen.insns_sz, false, false); 1935 kernel_syms_destroy(&dd); 1936 } 1937 err = try_loader(&gen); 1938 err_close_obj: 1939 bpf_object__close(obj); 1940 return err; 1941 } 1942 1943 static int do_load(int argc, char **argv) 1944 { 1945 if (use_loader) 1946 return do_loader(argc, argv); 1947 return load_with_options(argc, argv, true); 1948 } 1949 1950 static int do_loadall(int argc, char **argv) 1951 { 1952 return load_with_options(argc, argv, false); 1953 } 1954 1955 #ifdef BPFTOOL_WITHOUT_SKELETONS 1956 1957 static int do_profile(int argc, char **argv) 1958 { 1959 p_err("bpftool prog profile command is not supported. Please build bpftool with clang >= 10.0.0"); 1960 return 0; 1961 } 1962 1963 #else /* BPFTOOL_WITHOUT_SKELETONS */ 1964 1965 #include "profiler.skel.h" 1966 1967 struct profile_metric { 1968 const char *name; 1969 struct bpf_perf_event_value val; 1970 struct perf_event_attr attr; 1971 bool selected; 1972 1973 /* calculate ratios like instructions per cycle */ 1974 const int ratio_metric; /* 0 for N/A, 1 for index 0 (cycles) */ 1975 const char *ratio_desc; 1976 const float ratio_mul; 1977 } metrics[] = { 1978 { 1979 .name = "cycles", 1980 .attr = { 1981 .type = PERF_TYPE_HARDWARE, 1982 .config = PERF_COUNT_HW_CPU_CYCLES, 1983 .exclude_user = 1, 1984 }, 1985 }, 1986 { 1987 .name = "instructions", 1988 .attr = { 1989 .type = PERF_TYPE_HARDWARE, 1990 .config = PERF_COUNT_HW_INSTRUCTIONS, 1991 .exclude_user = 1, 1992 }, 1993 .ratio_metric = 1, 1994 .ratio_desc = "insns per cycle", 1995 .ratio_mul = 1.0, 1996 }, 1997 { 1998 .name = "l1d_loads", 1999 .attr = { 2000 .type = PERF_TYPE_HW_CACHE, 2001 .config = 2002 PERF_COUNT_HW_CACHE_L1D | 2003 (PERF_COUNT_HW_CACHE_OP_READ << 8) | 2004 (PERF_COUNT_HW_CACHE_RESULT_ACCESS << 16), 2005 .exclude_user = 1, 2006 }, 2007 }, 2008 { 2009 .name = "llc_misses", 2010 .attr = { 2011 .type = PERF_TYPE_HW_CACHE, 2012 .config = 2013 PERF_COUNT_HW_CACHE_LL | 2014 (PERF_COUNT_HW_CACHE_OP_READ << 8) | 2015 (PERF_COUNT_HW_CACHE_RESULT_MISS << 16), 2016 .exclude_user = 1 2017 }, 2018 .ratio_metric = 2, 2019 .ratio_desc = "LLC misses per million insns", 2020 .ratio_mul = 1e6, 2021 }, 2022 { 2023 .name = "itlb_misses", 2024 .attr = { 2025 .type = PERF_TYPE_HW_CACHE, 2026 .config = 2027 PERF_COUNT_HW_CACHE_ITLB | 2028 (PERF_COUNT_HW_CACHE_OP_READ << 8) | 2029 (PERF_COUNT_HW_CACHE_RESULT_MISS << 16), 2030 .exclude_user = 1 2031 }, 2032 .ratio_metric = 2, 2033 .ratio_desc = "itlb misses per million insns", 2034 .ratio_mul = 1e6, 2035 }, 2036 { 2037 .name = "dtlb_misses", 2038 .attr = { 2039 .type = PERF_TYPE_HW_CACHE, 2040 .config = 2041 PERF_COUNT_HW_CACHE_DTLB | 2042 (PERF_COUNT_HW_CACHE_OP_READ << 8) | 2043 (PERF_COUNT_HW_CACHE_RESULT_MISS << 16), 2044 .exclude_user = 1 2045 }, 2046 .ratio_metric = 2, 2047 .ratio_desc = "dtlb misses per million insns", 2048 .ratio_mul = 1e6, 2049 }, 2050 }; 2051 2052 static __u64 profile_total_count; 2053 2054 #define MAX_NUM_PROFILE_METRICS 4 2055 2056 static int profile_parse_metrics(int argc, char **argv) 2057 { 2058 unsigned int metric_cnt; 2059 int selected_cnt = 0; 2060 unsigned int i; 2061 2062 metric_cnt = ARRAY_SIZE(metrics); 2063 2064 while (argc > 0) { 2065 for (i = 0; i < metric_cnt; i++) { 2066 if (is_prefix(argv[0], metrics[i].name)) { 2067 if (!metrics[i].selected) 2068 selected_cnt++; 2069 metrics[i].selected = true; 2070 break; 2071 } 2072 } 2073 if (i == metric_cnt) { 2074 p_err("unknown metric %s", argv[0]); 2075 return -1; 2076 } 2077 NEXT_ARG(); 2078 } 2079 if (selected_cnt > MAX_NUM_PROFILE_METRICS) { 2080 p_err("too many (%d) metrics, please specify no more than %d metrics at at time", 2081 selected_cnt, MAX_NUM_PROFILE_METRICS); 2082 return -1; 2083 } 2084 return selected_cnt; 2085 } 2086 2087 static void profile_read_values(struct profiler_bpf *obj) 2088 { 2089 __u32 m, cpu, num_cpu = obj->rodata->num_cpu; 2090 int reading_map_fd, count_map_fd; 2091 __u64 counts[num_cpu]; 2092 __u32 key = 0; 2093 int err; 2094 2095 reading_map_fd = bpf_map__fd(obj->maps.accum_readings); 2096 count_map_fd = bpf_map__fd(obj->maps.counts); 2097 if (reading_map_fd < 0 || count_map_fd < 0) { 2098 p_err("failed to get fd for map"); 2099 return; 2100 } 2101 2102 err = bpf_map_lookup_elem(count_map_fd, &key, counts); 2103 if (err) { 2104 p_err("failed to read count_map: %s", strerror(errno)); 2105 return; 2106 } 2107 2108 profile_total_count = 0; 2109 for (cpu = 0; cpu < num_cpu; cpu++) 2110 profile_total_count += counts[cpu]; 2111 2112 for (m = 0; m < ARRAY_SIZE(metrics); m++) { 2113 struct bpf_perf_event_value values[num_cpu]; 2114 2115 if (!metrics[m].selected) 2116 continue; 2117 2118 err = bpf_map_lookup_elem(reading_map_fd, &key, values); 2119 if (err) { 2120 p_err("failed to read reading_map: %s", 2121 strerror(errno)); 2122 return; 2123 } 2124 for (cpu = 0; cpu < num_cpu; cpu++) { 2125 metrics[m].val.counter += values[cpu].counter; 2126 metrics[m].val.enabled += values[cpu].enabled; 2127 metrics[m].val.running += values[cpu].running; 2128 } 2129 key++; 2130 } 2131 } 2132 2133 static void profile_print_readings_json(void) 2134 { 2135 __u32 m; 2136 2137 jsonw_start_array(json_wtr); 2138 for (m = 0; m < ARRAY_SIZE(metrics); m++) { 2139 if (!metrics[m].selected) 2140 continue; 2141 jsonw_start_object(json_wtr); 2142 jsonw_string_field(json_wtr, "metric", metrics[m].name); 2143 jsonw_lluint_field(json_wtr, "run_cnt", profile_total_count); 2144 jsonw_lluint_field(json_wtr, "value", metrics[m].val.counter); 2145 jsonw_lluint_field(json_wtr, "enabled", metrics[m].val.enabled); 2146 jsonw_lluint_field(json_wtr, "running", metrics[m].val.running); 2147 2148 jsonw_end_object(json_wtr); 2149 } 2150 jsonw_end_array(json_wtr); 2151 } 2152 2153 static void profile_print_readings_plain(void) 2154 { 2155 __u32 m; 2156 2157 printf("\n%18llu %-20s\n", profile_total_count, "run_cnt"); 2158 for (m = 0; m < ARRAY_SIZE(metrics); m++) { 2159 struct bpf_perf_event_value *val = &metrics[m].val; 2160 int r; 2161 2162 if (!metrics[m].selected) 2163 continue; 2164 printf("%18llu %-20s", val->counter, metrics[m].name); 2165 2166 r = metrics[m].ratio_metric - 1; 2167 if (r >= 0 && metrics[r].selected && 2168 metrics[r].val.counter > 0) { 2169 printf("# %8.2f %-30s", 2170 val->counter * metrics[m].ratio_mul / 2171 metrics[r].val.counter, 2172 metrics[m].ratio_desc); 2173 } else { 2174 printf("%-41s", ""); 2175 } 2176 2177 if (val->enabled > val->running) 2178 printf("(%4.2f%%)", 2179 val->running * 100.0 / val->enabled); 2180 printf("\n"); 2181 } 2182 } 2183 2184 static void profile_print_readings(void) 2185 { 2186 if (json_output) 2187 profile_print_readings_json(); 2188 else 2189 profile_print_readings_plain(); 2190 } 2191 2192 static char *profile_target_name(int tgt_fd) 2193 { 2194 struct bpf_func_info func_info; 2195 struct bpf_prog_info info = {}; 2196 __u32 info_len = sizeof(info); 2197 const struct btf_type *t; 2198 __u32 func_info_rec_size; 2199 struct btf *btf = NULL; 2200 char *name = NULL; 2201 int err; 2202 2203 err = bpf_prog_get_info_by_fd(tgt_fd, &info, &info_len); 2204 if (err) { 2205 p_err("failed to get info for prog FD %d", tgt_fd); 2206 goto out; 2207 } 2208 2209 if (info.btf_id == 0) { 2210 p_err("prog FD %d doesn't have valid btf", tgt_fd); 2211 goto out; 2212 } 2213 2214 func_info_rec_size = info.func_info_rec_size; 2215 if (info.nr_func_info == 0) { 2216 p_err("found 0 func_info for prog FD %d", tgt_fd); 2217 goto out; 2218 } 2219 2220 memset(&info, 0, sizeof(info)); 2221 info.nr_func_info = 1; 2222 info.func_info_rec_size = func_info_rec_size; 2223 info.func_info = ptr_to_u64(&func_info); 2224 2225 err = bpf_prog_get_info_by_fd(tgt_fd, &info, &info_len); 2226 if (err) { 2227 p_err("failed to get func_info for prog FD %d", tgt_fd); 2228 goto out; 2229 } 2230 2231 btf = btf__load_from_kernel_by_id(info.btf_id); 2232 if (!btf) { 2233 p_err("failed to load btf for prog FD %d", tgt_fd); 2234 goto out; 2235 } 2236 2237 t = btf__type_by_id(btf, func_info.type_id); 2238 if (!t) { 2239 p_err("btf %d doesn't have type %d", 2240 info.btf_id, func_info.type_id); 2241 goto out; 2242 } 2243 name = strdup(btf__name_by_offset(btf, t->name_off)); 2244 out: 2245 btf__free(btf); 2246 return name; 2247 } 2248 2249 static struct profiler_bpf *profile_obj; 2250 static int profile_tgt_fd = -1; 2251 static char *profile_tgt_name; 2252 static int *profile_perf_events; 2253 static int profile_perf_event_cnt; 2254 2255 static void profile_close_perf_events(struct profiler_bpf *obj) 2256 { 2257 int i; 2258 2259 for (i = profile_perf_event_cnt - 1; i >= 0; i--) 2260 close(profile_perf_events[i]); 2261 2262 free(profile_perf_events); 2263 profile_perf_event_cnt = 0; 2264 } 2265 2266 static int profile_open_perf_event(int mid, int cpu, int map_fd) 2267 { 2268 int pmu_fd; 2269 2270 pmu_fd = syscall(__NR_perf_event_open, &metrics[mid].attr, 2271 -1 /*pid*/, cpu, -1 /*group_fd*/, 0); 2272 if (pmu_fd < 0) { 2273 if (errno == ENODEV) { 2274 p_info("cpu %d may be offline, skip %s profiling.", 2275 cpu, metrics[mid].name); 2276 profile_perf_event_cnt++; 2277 return 0; 2278 } 2279 return -1; 2280 } 2281 2282 if (bpf_map_update_elem(map_fd, 2283 &profile_perf_event_cnt, 2284 &pmu_fd, BPF_ANY) || 2285 ioctl(pmu_fd, PERF_EVENT_IOC_ENABLE, 0)) { 2286 close(pmu_fd); 2287 return -1; 2288 } 2289 2290 profile_perf_events[profile_perf_event_cnt++] = pmu_fd; 2291 return 0; 2292 } 2293 2294 static int profile_open_perf_events(struct profiler_bpf *obj) 2295 { 2296 unsigned int cpu, m; 2297 int map_fd; 2298 2299 profile_perf_events = calloc( 2300 obj->rodata->num_cpu * obj->rodata->num_metric, sizeof(int)); 2301 if (!profile_perf_events) { 2302 p_err("failed to allocate memory for perf_event array: %s", 2303 strerror(errno)); 2304 return -1; 2305 } 2306 map_fd = bpf_map__fd(obj->maps.events); 2307 if (map_fd < 0) { 2308 p_err("failed to get fd for events map"); 2309 return -1; 2310 } 2311 2312 for (m = 0; m < ARRAY_SIZE(metrics); m++) { 2313 if (!metrics[m].selected) 2314 continue; 2315 for (cpu = 0; cpu < obj->rodata->num_cpu; cpu++) { 2316 if (profile_open_perf_event(m, cpu, map_fd)) { 2317 p_err("failed to create event %s on cpu %d", 2318 metrics[m].name, cpu); 2319 return -1; 2320 } 2321 } 2322 } 2323 return 0; 2324 } 2325 2326 static void profile_print_and_cleanup(void) 2327 { 2328 profile_close_perf_events(profile_obj); 2329 profile_read_values(profile_obj); 2330 profile_print_readings(); 2331 profiler_bpf__destroy(profile_obj); 2332 2333 close(profile_tgt_fd); 2334 free(profile_tgt_name); 2335 } 2336 2337 static void int_exit(int signo) 2338 { 2339 profile_print_and_cleanup(); 2340 exit(0); 2341 } 2342 2343 static int do_profile(int argc, char **argv) 2344 { 2345 int num_metric, num_cpu, err = -1; 2346 struct bpf_program *prog; 2347 unsigned long duration; 2348 char *endptr; 2349 2350 /* we at least need two args for the prog and one metric */ 2351 if (!REQ_ARGS(3)) 2352 return -EINVAL; 2353 2354 /* parse target fd */ 2355 profile_tgt_fd = prog_parse_fd(&argc, &argv); 2356 if (profile_tgt_fd < 0) { 2357 p_err("failed to parse fd"); 2358 return -1; 2359 } 2360 2361 /* parse profiling optional duration */ 2362 if (argc > 2 && is_prefix(argv[0], "duration")) { 2363 NEXT_ARG(); 2364 duration = strtoul(*argv, &endptr, 0); 2365 if (*endptr) 2366 usage(); 2367 NEXT_ARG(); 2368 } else { 2369 duration = UINT_MAX; 2370 } 2371 2372 num_metric = profile_parse_metrics(argc, argv); 2373 if (num_metric <= 0) 2374 goto out; 2375 2376 num_cpu = libbpf_num_possible_cpus(); 2377 if (num_cpu <= 0) { 2378 p_err("failed to identify number of CPUs"); 2379 goto out; 2380 } 2381 2382 profile_obj = profiler_bpf__open(); 2383 if (!profile_obj) { 2384 p_err("failed to open and/or load BPF object"); 2385 goto out; 2386 } 2387 2388 profile_obj->rodata->num_cpu = num_cpu; 2389 profile_obj->rodata->num_metric = num_metric; 2390 2391 /* adjust map sizes */ 2392 bpf_map__set_max_entries(profile_obj->maps.events, num_metric * num_cpu); 2393 bpf_map__set_max_entries(profile_obj->maps.fentry_readings, num_metric); 2394 bpf_map__set_max_entries(profile_obj->maps.accum_readings, num_metric); 2395 bpf_map__set_max_entries(profile_obj->maps.counts, 1); 2396 2397 /* change target name */ 2398 profile_tgt_name = profile_target_name(profile_tgt_fd); 2399 if (!profile_tgt_name) 2400 goto out; 2401 2402 bpf_object__for_each_program(prog, profile_obj->obj) { 2403 err = bpf_program__set_attach_target(prog, profile_tgt_fd, 2404 profile_tgt_name); 2405 if (err) { 2406 p_err("failed to set attach target\n"); 2407 goto out; 2408 } 2409 } 2410 2411 set_max_rlimit(); 2412 err = profiler_bpf__load(profile_obj); 2413 if (err) { 2414 p_err("failed to load profile_obj"); 2415 goto out; 2416 } 2417 2418 err = profile_open_perf_events(profile_obj); 2419 if (err) 2420 goto out; 2421 2422 err = profiler_bpf__attach(profile_obj); 2423 if (err) { 2424 p_err("failed to attach profile_obj"); 2425 goto out; 2426 } 2427 signal(SIGINT, int_exit); 2428 2429 sleep(duration); 2430 profile_print_and_cleanup(); 2431 return 0; 2432 2433 out: 2434 profile_close_perf_events(profile_obj); 2435 if (profile_obj) 2436 profiler_bpf__destroy(profile_obj); 2437 close(profile_tgt_fd); 2438 free(profile_tgt_name); 2439 return err; 2440 } 2441 2442 #endif /* BPFTOOL_WITHOUT_SKELETONS */ 2443 2444 static int do_help(int argc, char **argv) 2445 { 2446 if (json_output) { 2447 jsonw_null(json_wtr); 2448 return 0; 2449 } 2450 2451 fprintf(stderr, 2452 "Usage: %1$s %2$s { show | list } [PROG]\n" 2453 " %1$s %2$s dump xlated PROG [{ file FILE | [opcodes] [linum] [visual] }]\n" 2454 " %1$s %2$s dump jited PROG [{ file FILE | [opcodes] [linum] }]\n" 2455 " %1$s %2$s pin PROG FILE\n" 2456 " %1$s %2$s { load | loadall } OBJ PATH \\\n" 2457 " [type TYPE] [{ offload_dev | xdpmeta_dev } NAME] \\\n" 2458 " [map { idx IDX | name NAME } MAP]\\\n" 2459 " [pinmaps MAP_DIR]\n" 2460 " [autoattach]\n" 2461 " %1$s %2$s attach PROG ATTACH_TYPE [MAP]\n" 2462 " %1$s %2$s detach PROG ATTACH_TYPE [MAP]\n" 2463 " %1$s %2$s run PROG \\\n" 2464 " data_in FILE \\\n" 2465 " [data_out FILE [data_size_out L]] \\\n" 2466 " [ctx_in FILE [ctx_out FILE [ctx_size_out M]]] \\\n" 2467 " [repeat N]\n" 2468 " %1$s %2$s profile PROG [duration DURATION] METRICs\n" 2469 " %1$s %2$s tracelog\n" 2470 " %1$s %2$s help\n" 2471 "\n" 2472 " " HELP_SPEC_MAP "\n" 2473 " " HELP_SPEC_PROGRAM "\n" 2474 " TYPE := { socket | kprobe | kretprobe | classifier | action |\n" 2475 " tracepoint | raw_tracepoint | xdp | perf_event | cgroup/skb |\n" 2476 " cgroup/sock | cgroup/dev | lwt_in | lwt_out | lwt_xmit |\n" 2477 " lwt_seg6local | sockops | sk_skb | sk_msg | lirc_mode2 |\n" 2478 " sk_reuseport | flow_dissector | cgroup/sysctl |\n" 2479 " cgroup/bind4 | cgroup/bind6 | cgroup/post_bind4 |\n" 2480 " cgroup/post_bind6 | cgroup/connect4 | cgroup/connect6 |\n" 2481 " cgroup/getpeername4 | cgroup/getpeername6 |\n" 2482 " cgroup/getsockname4 | cgroup/getsockname6 | cgroup/sendmsg4 |\n" 2483 " cgroup/sendmsg6 | cgroup/recvmsg4 | cgroup/recvmsg6 |\n" 2484 " cgroup/getsockopt | cgroup/setsockopt | cgroup/sock_release |\n" 2485 " struct_ops | fentry | fexit | freplace | sk_lookup }\n" 2486 " ATTACH_TYPE := { sk_msg_verdict | sk_skb_verdict | sk_skb_stream_verdict |\n" 2487 " sk_skb_stream_parser | flow_dissector }\n" 2488 " METRIC := { cycles | instructions | l1d_loads | llc_misses | itlb_misses | dtlb_misses }\n" 2489 " " HELP_SPEC_OPTIONS " |\n" 2490 " {-f|--bpffs} | {-m|--mapcompat} | {-n|--nomount} |\n" 2491 " {-L|--use-loader} }\n" 2492 "", 2493 bin_name, argv[-2]); 2494 2495 return 0; 2496 } 2497 2498 static const struct cmd cmds[] = { 2499 { "show", do_show }, 2500 { "list", do_show }, 2501 { "help", do_help }, 2502 { "dump", do_dump }, 2503 { "pin", do_pin }, 2504 { "load", do_load }, 2505 { "loadall", do_loadall }, 2506 { "attach", do_attach }, 2507 { "detach", do_detach }, 2508 { "tracelog", do_tracelog }, 2509 { "run", do_run }, 2510 { "profile", do_profile }, 2511 { 0 } 2512 }; 2513 2514 int do_prog(int argc, char **argv) 2515 { 2516 return cmd_select(cmds, argc, argv, do_help); 2517 } 2518