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, bool orphaned) 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_bool_field(json_wtr, "orphaned", orphaned); 465 jsonw_uint_field(json_wtr, "bytes_xlated", info->xlated_prog_len); 466 467 if (info->jited_prog_len) { 468 jsonw_bool_field(json_wtr, "jited", true); 469 jsonw_uint_field(json_wtr, "bytes_jited", info->jited_prog_len); 470 } else { 471 jsonw_bool_field(json_wtr, "jited", false); 472 } 473 474 memlock = get_fdinfo(fd, "memlock"); 475 if (memlock) 476 jsonw_int_field(json_wtr, "bytes_memlock", atoll(memlock)); 477 free(memlock); 478 479 if (info->nr_map_ids) 480 show_prog_maps(fd, info->nr_map_ids); 481 482 if (info->btf_id) 483 jsonw_int_field(json_wtr, "btf_id", info->btf_id); 484 485 if (!hashmap__empty(prog_table)) { 486 struct hashmap_entry *entry; 487 488 jsonw_name(json_wtr, "pinned"); 489 jsonw_start_array(json_wtr); 490 hashmap__for_each_key_entry(prog_table, entry, info->id) 491 jsonw_string(json_wtr, entry->pvalue); 492 jsonw_end_array(json_wtr); 493 } 494 495 emit_obj_refs_json(refs_table, info->id, json_wtr); 496 497 show_prog_metadata(fd, info->nr_map_ids); 498 499 jsonw_end_object(json_wtr); 500 } 501 502 static void print_prog_header_plain(struct bpf_prog_info *info, int fd) 503 { 504 const char *prog_type_str; 505 char prog_name[MAX_PROG_FULL_NAME]; 506 507 printf("%u: ", info->id); 508 prog_type_str = libbpf_bpf_prog_type_str(info->type); 509 if (prog_type_str) 510 printf("%s ", prog_type_str); 511 else 512 printf("type %u ", info->type); 513 514 if (*info->name) { 515 get_prog_full_name(info, fd, prog_name, sizeof(prog_name)); 516 printf("name %s ", prog_name); 517 } 518 519 printf("tag "); 520 fprint_hex(stdout, info->tag, BPF_TAG_SIZE, ""); 521 print_dev_plain(info->ifindex, info->netns_dev, info->netns_ino); 522 printf("%s", info->gpl_compatible ? " gpl" : ""); 523 if (info->run_time_ns) 524 printf(" run_time_ns %llu run_cnt %llu", 525 info->run_time_ns, info->run_cnt); 526 if (info->recursion_misses) 527 printf(" recursion_misses %llu", info->recursion_misses); 528 printf("\n"); 529 } 530 531 static void print_prog_plain(struct bpf_prog_info *info, int fd, bool orphaned) 532 { 533 char *memlock; 534 535 print_prog_header_plain(info, fd); 536 537 if (info->load_time) { 538 char buf[32]; 539 540 print_boot_time(info->load_time, buf, sizeof(buf)); 541 542 /* Piggy back on load_time, since 0 uid is a valid one */ 543 printf("\tloaded_at %s uid %u\n", buf, info->created_by_uid); 544 } 545 546 printf("\txlated %uB", info->xlated_prog_len); 547 548 if (info->jited_prog_len) 549 printf(" jited %uB", info->jited_prog_len); 550 else 551 printf(" not jited"); 552 553 memlock = get_fdinfo(fd, "memlock"); 554 if (memlock) 555 printf(" memlock %sB", memlock); 556 free(memlock); 557 558 if (orphaned) 559 printf(" orphaned"); 560 561 if (info->nr_map_ids) 562 show_prog_maps(fd, info->nr_map_ids); 563 564 if (!hashmap__empty(prog_table)) { 565 struct hashmap_entry *entry; 566 567 hashmap__for_each_key_entry(prog_table, entry, info->id) 568 printf("\n\tpinned %s", (char *)entry->pvalue); 569 } 570 571 if (info->btf_id) 572 printf("\n\tbtf_id %u", info->btf_id); 573 574 emit_obj_refs_plain(refs_table, info->id, "\n\tpids "); 575 576 printf("\n"); 577 578 show_prog_metadata(fd, info->nr_map_ids); 579 } 580 581 static int show_prog(int fd) 582 { 583 struct bpf_prog_info info = {}; 584 __u32 len = sizeof(info); 585 int err; 586 587 err = bpf_prog_get_info_by_fd(fd, &info, &len); 588 if (err && err != -ENODEV) { 589 p_err("can't get prog info: %s", strerror(errno)); 590 return -1; 591 } 592 593 if (json_output) 594 print_prog_json(&info, fd, err == -ENODEV); 595 else 596 print_prog_plain(&info, fd, err == -ENODEV); 597 598 return 0; 599 } 600 601 static int do_show_subset(int argc, char **argv) 602 { 603 int *fds = NULL; 604 int nb_fds, i; 605 int err = -1; 606 607 fds = malloc(sizeof(int)); 608 if (!fds) { 609 p_err("mem alloc failed"); 610 return -1; 611 } 612 nb_fds = prog_parse_fds(&argc, &argv, &fds); 613 if (nb_fds < 1) 614 goto exit_free; 615 616 if (json_output && nb_fds > 1) 617 jsonw_start_array(json_wtr); /* root array */ 618 for (i = 0; i < nb_fds; i++) { 619 err = show_prog(fds[i]); 620 if (err) { 621 for (; i < nb_fds; i++) 622 close(fds[i]); 623 break; 624 } 625 close(fds[i]); 626 } 627 if (json_output && nb_fds > 1) 628 jsonw_end_array(json_wtr); /* root array */ 629 630 exit_free: 631 free(fds); 632 return err; 633 } 634 635 static int do_show(int argc, char **argv) 636 { 637 __u32 id = 0; 638 int err; 639 int fd; 640 641 if (show_pinned) { 642 prog_table = hashmap__new(hash_fn_for_key_as_id, 643 equal_fn_for_key_as_id, NULL); 644 if (IS_ERR(prog_table)) { 645 p_err("failed to create hashmap for pinned paths"); 646 return -1; 647 } 648 build_pinned_obj_table(prog_table, BPF_OBJ_PROG); 649 } 650 build_obj_refs_table(&refs_table, BPF_OBJ_PROG); 651 652 if (argc == 2) 653 return do_show_subset(argc, argv); 654 655 if (argc) 656 return BAD_ARG(); 657 658 if (json_output) 659 jsonw_start_array(json_wtr); 660 while (true) { 661 err = bpf_prog_get_next_id(id, &id); 662 if (err) { 663 if (errno == ENOENT) { 664 err = 0; 665 break; 666 } 667 p_err("can't get next program: %s%s", strerror(errno), 668 errno == EINVAL ? " -- kernel too old?" : ""); 669 err = -1; 670 break; 671 } 672 673 fd = bpf_prog_get_fd_by_id(id); 674 if (fd < 0) { 675 if (errno == ENOENT) 676 continue; 677 p_err("can't get prog by id (%u): %s", 678 id, strerror(errno)); 679 err = -1; 680 break; 681 } 682 683 err = show_prog(fd); 684 close(fd); 685 if (err) 686 break; 687 } 688 689 if (json_output) 690 jsonw_end_array(json_wtr); 691 692 delete_obj_refs_table(refs_table); 693 694 if (show_pinned) 695 delete_pinned_obj_table(prog_table); 696 697 return err; 698 } 699 700 static int 701 prog_dump(struct bpf_prog_info *info, enum dump_mode mode, 702 char *filepath, bool opcodes, bool visual, bool linum) 703 { 704 struct bpf_prog_linfo *prog_linfo = NULL; 705 const char *disasm_opt = NULL; 706 struct dump_data dd = {}; 707 void *func_info = NULL; 708 struct btf *btf = NULL; 709 char func_sig[1024]; 710 unsigned char *buf; 711 __u32 member_len; 712 int fd, err = -1; 713 ssize_t n; 714 715 if (mode == DUMP_JITED) { 716 if (info->jited_prog_len == 0 || !info->jited_prog_insns) { 717 p_info("no instructions returned"); 718 return -1; 719 } 720 buf = u64_to_ptr(info->jited_prog_insns); 721 member_len = info->jited_prog_len; 722 } else { /* DUMP_XLATED */ 723 if (info->xlated_prog_len == 0 || !info->xlated_prog_insns) { 724 p_err("error retrieving insn dump: kernel.kptr_restrict set?"); 725 return -1; 726 } 727 buf = u64_to_ptr(info->xlated_prog_insns); 728 member_len = info->xlated_prog_len; 729 } 730 731 if (info->btf_id) { 732 btf = btf__load_from_kernel_by_id(info->btf_id); 733 if (!btf) { 734 p_err("failed to get btf"); 735 return -1; 736 } 737 } 738 739 func_info = u64_to_ptr(info->func_info); 740 741 if (info->nr_line_info) { 742 prog_linfo = bpf_prog_linfo__new(info); 743 if (!prog_linfo) 744 p_info("error in processing bpf_line_info. continue without it."); 745 } 746 747 if (filepath) { 748 fd = open(filepath, O_WRONLY | O_CREAT | O_TRUNC, 0600); 749 if (fd < 0) { 750 p_err("can't open file %s: %s", filepath, 751 strerror(errno)); 752 goto exit_free; 753 } 754 755 n = write(fd, buf, member_len); 756 close(fd); 757 if (n != (ssize_t)member_len) { 758 p_err("error writing output file: %s", 759 n < 0 ? strerror(errno) : "short write"); 760 goto exit_free; 761 } 762 763 if (json_output) 764 jsonw_null(json_wtr); 765 } else if (mode == DUMP_JITED) { 766 const char *name = NULL; 767 768 if (info->ifindex) { 769 name = ifindex_to_arch(info->ifindex, info->netns_dev, 770 info->netns_ino, &disasm_opt); 771 if (!name) 772 goto exit_free; 773 } 774 775 if (info->nr_jited_func_lens && info->jited_func_lens) { 776 struct kernel_sym *sym = NULL; 777 struct bpf_func_info *record; 778 char sym_name[SYM_MAX_NAME]; 779 unsigned char *img = buf; 780 __u64 *ksyms = NULL; 781 __u32 *lens; 782 __u32 i; 783 if (info->nr_jited_ksyms) { 784 kernel_syms_load(&dd); 785 ksyms = u64_to_ptr(info->jited_ksyms); 786 } 787 788 if (json_output) 789 jsonw_start_array(json_wtr); 790 791 lens = u64_to_ptr(info->jited_func_lens); 792 for (i = 0; i < info->nr_jited_func_lens; i++) { 793 if (ksyms) { 794 sym = kernel_syms_search(&dd, ksyms[i]); 795 if (sym) 796 sprintf(sym_name, "%s", sym->name); 797 else 798 sprintf(sym_name, "0x%016llx", ksyms[i]); 799 } else { 800 strcpy(sym_name, "unknown"); 801 } 802 803 if (func_info) { 804 record = func_info + i * info->func_info_rec_size; 805 btf_dumper_type_only(btf, record->type_id, 806 func_sig, 807 sizeof(func_sig)); 808 } 809 810 if (json_output) { 811 jsonw_start_object(json_wtr); 812 if (func_info && func_sig[0] != '\0') { 813 jsonw_name(json_wtr, "proto"); 814 jsonw_string(json_wtr, func_sig); 815 } 816 jsonw_name(json_wtr, "name"); 817 jsonw_string(json_wtr, sym_name); 818 jsonw_name(json_wtr, "insns"); 819 } else { 820 if (func_info && func_sig[0] != '\0') 821 printf("%s:\n", func_sig); 822 printf("%s:\n", sym_name); 823 } 824 825 if (ksyms) { 826 if (disasm_print_insn(img, lens[i], opcodes, 827 name, disasm_opt, btf, 828 prog_linfo, ksyms[i], i, 829 linum)) 830 goto exit_free; 831 } else { 832 if (disasm_print_insn(img, lens[i], opcodes, 833 name, disasm_opt, btf, 834 NULL, 0, 0, false)) 835 goto exit_free; 836 } 837 838 img += lens[i]; 839 840 if (json_output) 841 jsonw_end_object(json_wtr); 842 else 843 printf("\n"); 844 } 845 846 if (json_output) 847 jsonw_end_array(json_wtr); 848 } else { 849 if (disasm_print_insn(buf, member_len, opcodes, name, 850 disasm_opt, btf, NULL, 0, 0, 851 false)) 852 goto exit_free; 853 } 854 } else { 855 kernel_syms_load(&dd); 856 dd.nr_jited_ksyms = info->nr_jited_ksyms; 857 dd.jited_ksyms = u64_to_ptr(info->jited_ksyms); 858 dd.btf = btf; 859 dd.func_info = func_info; 860 dd.finfo_rec_size = info->func_info_rec_size; 861 dd.prog_linfo = prog_linfo; 862 863 if (json_output) 864 dump_xlated_json(&dd, buf, member_len, opcodes, linum); 865 else if (visual) 866 dump_xlated_cfg(&dd, buf, member_len, opcodes, linum); 867 else 868 dump_xlated_plain(&dd, buf, member_len, opcodes, linum); 869 kernel_syms_destroy(&dd); 870 } 871 872 err = 0; 873 874 exit_free: 875 btf__free(btf); 876 bpf_prog_linfo__free(prog_linfo); 877 return err; 878 } 879 880 static int do_dump(int argc, char **argv) 881 { 882 struct bpf_prog_info info; 883 __u32 info_len = sizeof(info); 884 size_t info_data_sz = 0; 885 void *info_data = NULL; 886 char *filepath = NULL; 887 bool opcodes = false; 888 bool visual = false; 889 enum dump_mode mode; 890 bool linum = false; 891 int nb_fds, i = 0; 892 int *fds = NULL; 893 int err = -1; 894 895 if (is_prefix(*argv, "jited")) { 896 if (disasm_init()) 897 return -1; 898 mode = DUMP_JITED; 899 } else if (is_prefix(*argv, "xlated")) { 900 mode = DUMP_XLATED; 901 } else { 902 p_err("expected 'xlated' or 'jited', got: %s", *argv); 903 return -1; 904 } 905 NEXT_ARG(); 906 907 if (argc < 2) 908 usage(); 909 910 fds = malloc(sizeof(int)); 911 if (!fds) { 912 p_err("mem alloc failed"); 913 return -1; 914 } 915 nb_fds = prog_parse_fds(&argc, &argv, &fds); 916 if (nb_fds < 1) 917 goto exit_free; 918 919 while (argc) { 920 if (is_prefix(*argv, "file")) { 921 NEXT_ARG(); 922 if (!argc) { 923 p_err("expected file path"); 924 goto exit_close; 925 } 926 if (nb_fds > 1) { 927 p_err("several programs matched"); 928 goto exit_close; 929 } 930 931 filepath = *argv; 932 NEXT_ARG(); 933 } else if (is_prefix(*argv, "opcodes")) { 934 opcodes = true; 935 NEXT_ARG(); 936 } else if (is_prefix(*argv, "visual")) { 937 if (nb_fds > 1) { 938 p_err("several programs matched"); 939 goto exit_close; 940 } 941 942 visual = true; 943 NEXT_ARG(); 944 } else if (is_prefix(*argv, "linum")) { 945 linum = true; 946 NEXT_ARG(); 947 } else { 948 usage(); 949 goto exit_close; 950 } 951 } 952 953 if (filepath && (opcodes || visual || linum)) { 954 p_err("'file' is not compatible with 'opcodes', 'visual', or 'linum'"); 955 goto exit_close; 956 } 957 if (json_output && visual) { 958 p_err("'visual' is not compatible with JSON output"); 959 goto exit_close; 960 } 961 962 if (json_output && nb_fds > 1) 963 jsonw_start_array(json_wtr); /* root array */ 964 for (i = 0; i < nb_fds; i++) { 965 memset(&info, 0, sizeof(info)); 966 967 err = bpf_prog_get_info_by_fd(fds[i], &info, &info_len); 968 if (err) { 969 p_err("can't get prog info: %s", strerror(errno)); 970 break; 971 } 972 973 err = prep_prog_info(&info, mode, &info_data, &info_data_sz); 974 if (err) { 975 p_err("can't grow prog info_data"); 976 break; 977 } 978 979 err = bpf_prog_get_info_by_fd(fds[i], &info, &info_len); 980 if (err) { 981 p_err("can't get prog info: %s", strerror(errno)); 982 break; 983 } 984 985 if (json_output && nb_fds > 1) { 986 jsonw_start_object(json_wtr); /* prog object */ 987 print_prog_header_json(&info, fds[i]); 988 jsonw_name(json_wtr, "insns"); 989 } else if (nb_fds > 1) { 990 print_prog_header_plain(&info, fds[i]); 991 } 992 993 err = prog_dump(&info, mode, filepath, opcodes, visual, linum); 994 995 if (json_output && nb_fds > 1) 996 jsonw_end_object(json_wtr); /* prog object */ 997 else if (i != nb_fds - 1 && nb_fds > 1) 998 printf("\n"); 999 1000 if (err) 1001 break; 1002 close(fds[i]); 1003 } 1004 if (json_output && nb_fds > 1) 1005 jsonw_end_array(json_wtr); /* root array */ 1006 1007 exit_close: 1008 for (; i < nb_fds; i++) 1009 close(fds[i]); 1010 exit_free: 1011 free(info_data); 1012 free(fds); 1013 return err; 1014 } 1015 1016 static int do_pin(int argc, char **argv) 1017 { 1018 int err; 1019 1020 err = do_pin_any(argc, argv, prog_parse_fd); 1021 if (!err && json_output) 1022 jsonw_null(json_wtr); 1023 return err; 1024 } 1025 1026 struct map_replace { 1027 int idx; 1028 int fd; 1029 char *name; 1030 }; 1031 1032 static int map_replace_compar(const void *p1, const void *p2) 1033 { 1034 const struct map_replace *a = p1, *b = p2; 1035 1036 return a->idx - b->idx; 1037 } 1038 1039 static int parse_attach_detach_args(int argc, char **argv, int *progfd, 1040 enum bpf_attach_type *attach_type, 1041 int *mapfd) 1042 { 1043 if (!REQ_ARGS(3)) 1044 return -EINVAL; 1045 1046 *progfd = prog_parse_fd(&argc, &argv); 1047 if (*progfd < 0) 1048 return *progfd; 1049 1050 *attach_type = parse_attach_type(*argv); 1051 if (*attach_type == __MAX_BPF_ATTACH_TYPE) { 1052 p_err("invalid attach/detach type"); 1053 return -EINVAL; 1054 } 1055 1056 if (*attach_type == BPF_FLOW_DISSECTOR) { 1057 *mapfd = 0; 1058 return 0; 1059 } 1060 1061 NEXT_ARG(); 1062 if (!REQ_ARGS(2)) 1063 return -EINVAL; 1064 1065 *mapfd = map_parse_fd(&argc, &argv); 1066 if (*mapfd < 0) 1067 return *mapfd; 1068 1069 return 0; 1070 } 1071 1072 static int do_attach(int argc, char **argv) 1073 { 1074 enum bpf_attach_type attach_type; 1075 int err, progfd; 1076 int mapfd; 1077 1078 err = parse_attach_detach_args(argc, argv, 1079 &progfd, &attach_type, &mapfd); 1080 if (err) 1081 return err; 1082 1083 err = bpf_prog_attach(progfd, mapfd, attach_type, 0); 1084 if (err) { 1085 p_err("failed prog attach to map"); 1086 return -EINVAL; 1087 } 1088 1089 if (json_output) 1090 jsonw_null(json_wtr); 1091 return 0; 1092 } 1093 1094 static int do_detach(int argc, char **argv) 1095 { 1096 enum bpf_attach_type attach_type; 1097 int err, progfd; 1098 int mapfd; 1099 1100 err = parse_attach_detach_args(argc, argv, 1101 &progfd, &attach_type, &mapfd); 1102 if (err) 1103 return err; 1104 1105 err = bpf_prog_detach2(progfd, mapfd, attach_type); 1106 if (err) { 1107 p_err("failed prog detach from map"); 1108 return -EINVAL; 1109 } 1110 1111 if (json_output) 1112 jsonw_null(json_wtr); 1113 return 0; 1114 } 1115 1116 static int check_single_stdin(char *file_data_in, char *file_ctx_in) 1117 { 1118 if (file_data_in && file_ctx_in && 1119 !strcmp(file_data_in, "-") && !strcmp(file_ctx_in, "-")) { 1120 p_err("cannot use standard input for both data_in and ctx_in"); 1121 return -1; 1122 } 1123 1124 return 0; 1125 } 1126 1127 static int get_run_data(const char *fname, void **data_ptr, unsigned int *size) 1128 { 1129 size_t block_size = 256; 1130 size_t buf_size = block_size; 1131 size_t nb_read = 0; 1132 void *tmp; 1133 FILE *f; 1134 1135 if (!fname) { 1136 *data_ptr = NULL; 1137 *size = 0; 1138 return 0; 1139 } 1140 1141 if (!strcmp(fname, "-")) 1142 f = stdin; 1143 else 1144 f = fopen(fname, "r"); 1145 if (!f) { 1146 p_err("failed to open %s: %s", fname, strerror(errno)); 1147 return -1; 1148 } 1149 1150 *data_ptr = malloc(block_size); 1151 if (!*data_ptr) { 1152 p_err("failed to allocate memory for data_in/ctx_in: %s", 1153 strerror(errno)); 1154 goto err_fclose; 1155 } 1156 1157 while ((nb_read += fread(*data_ptr + nb_read, 1, block_size, f))) { 1158 if (feof(f)) 1159 break; 1160 if (ferror(f)) { 1161 p_err("failed to read data_in/ctx_in from %s: %s", 1162 fname, strerror(errno)); 1163 goto err_free; 1164 } 1165 if (nb_read > buf_size - block_size) { 1166 if (buf_size == UINT32_MAX) { 1167 p_err("data_in/ctx_in is too long (max: %u)", 1168 UINT32_MAX); 1169 goto err_free; 1170 } 1171 /* No space for fread()-ing next chunk; realloc() */ 1172 buf_size *= 2; 1173 tmp = realloc(*data_ptr, buf_size); 1174 if (!tmp) { 1175 p_err("failed to reallocate data_in/ctx_in: %s", 1176 strerror(errno)); 1177 goto err_free; 1178 } 1179 *data_ptr = tmp; 1180 } 1181 } 1182 if (f != stdin) 1183 fclose(f); 1184 1185 *size = nb_read; 1186 return 0; 1187 1188 err_free: 1189 free(*data_ptr); 1190 *data_ptr = NULL; 1191 err_fclose: 1192 if (f != stdin) 1193 fclose(f); 1194 return -1; 1195 } 1196 1197 static void hex_print(void *data, unsigned int size, FILE *f) 1198 { 1199 size_t i, j; 1200 char c; 1201 1202 for (i = 0; i < size; i += 16) { 1203 /* Row offset */ 1204 fprintf(f, "%07zx\t", i); 1205 1206 /* Hexadecimal values */ 1207 for (j = i; j < i + 16 && j < size; j++) 1208 fprintf(f, "%02x%s", *(uint8_t *)(data + j), 1209 j % 2 ? " " : ""); 1210 for (; j < i + 16; j++) 1211 fprintf(f, " %s", j % 2 ? " " : ""); 1212 1213 /* ASCII values (if relevant), '.' otherwise */ 1214 fprintf(f, "| "); 1215 for (j = i; j < i + 16 && j < size; j++) { 1216 c = *(char *)(data + j); 1217 if (c < ' ' || c > '~') 1218 c = '.'; 1219 fprintf(f, "%c%s", c, j == i + 7 ? " " : ""); 1220 } 1221 1222 fprintf(f, "\n"); 1223 } 1224 } 1225 1226 static int 1227 print_run_output(void *data, unsigned int size, const char *fname, 1228 const char *json_key) 1229 { 1230 size_t nb_written; 1231 FILE *f; 1232 1233 if (!fname) 1234 return 0; 1235 1236 if (!strcmp(fname, "-")) { 1237 f = stdout; 1238 if (json_output) { 1239 jsonw_name(json_wtr, json_key); 1240 print_data_json(data, size); 1241 } else { 1242 hex_print(data, size, f); 1243 } 1244 return 0; 1245 } 1246 1247 f = fopen(fname, "w"); 1248 if (!f) { 1249 p_err("failed to open %s: %s", fname, strerror(errno)); 1250 return -1; 1251 } 1252 1253 nb_written = fwrite(data, 1, size, f); 1254 fclose(f); 1255 if (nb_written != size) { 1256 p_err("failed to write output data/ctx: %s", strerror(errno)); 1257 return -1; 1258 } 1259 1260 return 0; 1261 } 1262 1263 static int alloc_run_data(void **data_ptr, unsigned int size_out) 1264 { 1265 *data_ptr = calloc(size_out, 1); 1266 if (!*data_ptr) { 1267 p_err("failed to allocate memory for output data/ctx: %s", 1268 strerror(errno)); 1269 return -1; 1270 } 1271 1272 return 0; 1273 } 1274 1275 static int do_run(int argc, char **argv) 1276 { 1277 char *data_fname_in = NULL, *data_fname_out = NULL; 1278 char *ctx_fname_in = NULL, *ctx_fname_out = NULL; 1279 const unsigned int default_size = SZ_32K; 1280 void *data_in = NULL, *data_out = NULL; 1281 void *ctx_in = NULL, *ctx_out = NULL; 1282 unsigned int repeat = 1; 1283 int fd, err; 1284 LIBBPF_OPTS(bpf_test_run_opts, test_attr); 1285 1286 if (!REQ_ARGS(4)) 1287 return -1; 1288 1289 fd = prog_parse_fd(&argc, &argv); 1290 if (fd < 0) 1291 return -1; 1292 1293 while (argc) { 1294 if (detect_common_prefix(*argv, "data_in", "data_out", 1295 "data_size_out", NULL)) 1296 return -1; 1297 if (detect_common_prefix(*argv, "ctx_in", "ctx_out", 1298 "ctx_size_out", NULL)) 1299 return -1; 1300 1301 if (is_prefix(*argv, "data_in")) { 1302 NEXT_ARG(); 1303 if (!REQ_ARGS(1)) 1304 return -1; 1305 1306 data_fname_in = GET_ARG(); 1307 if (check_single_stdin(data_fname_in, ctx_fname_in)) 1308 return -1; 1309 } else if (is_prefix(*argv, "data_out")) { 1310 NEXT_ARG(); 1311 if (!REQ_ARGS(1)) 1312 return -1; 1313 1314 data_fname_out = GET_ARG(); 1315 } else if (is_prefix(*argv, "data_size_out")) { 1316 char *endptr; 1317 1318 NEXT_ARG(); 1319 if (!REQ_ARGS(1)) 1320 return -1; 1321 1322 test_attr.data_size_out = strtoul(*argv, &endptr, 0); 1323 if (*endptr) { 1324 p_err("can't parse %s as output data size", 1325 *argv); 1326 return -1; 1327 } 1328 NEXT_ARG(); 1329 } else if (is_prefix(*argv, "ctx_in")) { 1330 NEXT_ARG(); 1331 if (!REQ_ARGS(1)) 1332 return -1; 1333 1334 ctx_fname_in = GET_ARG(); 1335 if (check_single_stdin(data_fname_in, ctx_fname_in)) 1336 return -1; 1337 } else if (is_prefix(*argv, "ctx_out")) { 1338 NEXT_ARG(); 1339 if (!REQ_ARGS(1)) 1340 return -1; 1341 1342 ctx_fname_out = GET_ARG(); 1343 } else if (is_prefix(*argv, "ctx_size_out")) { 1344 char *endptr; 1345 1346 NEXT_ARG(); 1347 if (!REQ_ARGS(1)) 1348 return -1; 1349 1350 test_attr.ctx_size_out = strtoul(*argv, &endptr, 0); 1351 if (*endptr) { 1352 p_err("can't parse %s as output context size", 1353 *argv); 1354 return -1; 1355 } 1356 NEXT_ARG(); 1357 } else if (is_prefix(*argv, "repeat")) { 1358 char *endptr; 1359 1360 NEXT_ARG(); 1361 if (!REQ_ARGS(1)) 1362 return -1; 1363 1364 repeat = strtoul(*argv, &endptr, 0); 1365 if (*endptr) { 1366 p_err("can't parse %s as repeat number", 1367 *argv); 1368 return -1; 1369 } 1370 NEXT_ARG(); 1371 } else { 1372 p_err("expected no more arguments, 'data_in', 'data_out', 'data_size_out', 'ctx_in', 'ctx_out', 'ctx_size_out' or 'repeat', got: '%s'?", 1373 *argv); 1374 return -1; 1375 } 1376 } 1377 1378 err = get_run_data(data_fname_in, &data_in, &test_attr.data_size_in); 1379 if (err) 1380 return -1; 1381 1382 if (data_in) { 1383 if (!test_attr.data_size_out) 1384 test_attr.data_size_out = default_size; 1385 err = alloc_run_data(&data_out, test_attr.data_size_out); 1386 if (err) 1387 goto free_data_in; 1388 } 1389 1390 err = get_run_data(ctx_fname_in, &ctx_in, &test_attr.ctx_size_in); 1391 if (err) 1392 goto free_data_out; 1393 1394 if (ctx_in) { 1395 if (!test_attr.ctx_size_out) 1396 test_attr.ctx_size_out = default_size; 1397 err = alloc_run_data(&ctx_out, test_attr.ctx_size_out); 1398 if (err) 1399 goto free_ctx_in; 1400 } 1401 1402 test_attr.repeat = repeat; 1403 test_attr.data_in = data_in; 1404 test_attr.data_out = data_out; 1405 test_attr.ctx_in = ctx_in; 1406 test_attr.ctx_out = ctx_out; 1407 1408 err = bpf_prog_test_run_opts(fd, &test_attr); 1409 if (err) { 1410 p_err("failed to run program: %s", strerror(errno)); 1411 goto free_ctx_out; 1412 } 1413 1414 err = 0; 1415 1416 if (json_output) 1417 jsonw_start_object(json_wtr); /* root */ 1418 1419 /* Do not exit on errors occurring when printing output data/context, 1420 * we still want to print return value and duration for program run. 1421 */ 1422 if (test_attr.data_size_out) 1423 err += print_run_output(test_attr.data_out, 1424 test_attr.data_size_out, 1425 data_fname_out, "data_out"); 1426 if (test_attr.ctx_size_out) 1427 err += print_run_output(test_attr.ctx_out, 1428 test_attr.ctx_size_out, 1429 ctx_fname_out, "ctx_out"); 1430 1431 if (json_output) { 1432 jsonw_uint_field(json_wtr, "retval", test_attr.retval); 1433 jsonw_uint_field(json_wtr, "duration", test_attr.duration); 1434 jsonw_end_object(json_wtr); /* root */ 1435 } else { 1436 fprintf(stdout, "Return value: %u, duration%s: %uns\n", 1437 test_attr.retval, 1438 repeat > 1 ? " (average)" : "", test_attr.duration); 1439 } 1440 1441 free_ctx_out: 1442 free(ctx_out); 1443 free_ctx_in: 1444 free(ctx_in); 1445 free_data_out: 1446 free(data_out); 1447 free_data_in: 1448 free(data_in); 1449 1450 return err; 1451 } 1452 1453 static int 1454 get_prog_type_by_name(const char *name, enum bpf_prog_type *prog_type, 1455 enum bpf_attach_type *expected_attach_type) 1456 { 1457 libbpf_print_fn_t print_backup; 1458 int ret; 1459 1460 ret = libbpf_prog_type_by_name(name, prog_type, expected_attach_type); 1461 if (!ret) 1462 return ret; 1463 1464 /* libbpf_prog_type_by_name() failed, let's re-run with debug level */ 1465 print_backup = libbpf_set_print(print_all_levels); 1466 ret = libbpf_prog_type_by_name(name, prog_type, expected_attach_type); 1467 libbpf_set_print(print_backup); 1468 1469 return ret; 1470 } 1471 1472 static int 1473 auto_attach_program(struct bpf_program *prog, const char *path) 1474 { 1475 struct bpf_link *link; 1476 int err; 1477 1478 link = bpf_program__attach(prog); 1479 if (!link) { 1480 p_info("Program %s does not support autoattach, falling back to pinning", 1481 bpf_program__name(prog)); 1482 return bpf_obj_pin(bpf_program__fd(prog), path); 1483 } 1484 1485 err = bpf_link__pin(link, path); 1486 bpf_link__destroy(link); 1487 return err; 1488 } 1489 1490 static int 1491 auto_attach_programs(struct bpf_object *obj, const char *path) 1492 { 1493 struct bpf_program *prog; 1494 char buf[PATH_MAX]; 1495 int err; 1496 1497 bpf_object__for_each_program(prog, obj) { 1498 err = pathname_concat(buf, sizeof(buf), path, bpf_program__name(prog)); 1499 if (err) 1500 goto err_unpin_programs; 1501 1502 err = auto_attach_program(prog, buf); 1503 if (err) 1504 goto err_unpin_programs; 1505 } 1506 1507 return 0; 1508 1509 err_unpin_programs: 1510 while ((prog = bpf_object__prev_program(obj, prog))) { 1511 if (pathname_concat(buf, sizeof(buf), path, bpf_program__name(prog))) 1512 continue; 1513 1514 bpf_program__unpin(prog, buf); 1515 } 1516 1517 return err; 1518 } 1519 1520 static int load_with_options(int argc, char **argv, bool first_prog_only) 1521 { 1522 enum bpf_prog_type common_prog_type = BPF_PROG_TYPE_UNSPEC; 1523 DECLARE_LIBBPF_OPTS(bpf_object_open_opts, open_opts, 1524 .relaxed_maps = relaxed_maps, 1525 ); 1526 enum bpf_attach_type expected_attach_type; 1527 struct map_replace *map_replace = NULL; 1528 struct bpf_program *prog = NULL, *pos; 1529 unsigned int old_map_fds = 0; 1530 const char *pinmaps = NULL; 1531 __u32 xdpmeta_ifindex = 0; 1532 __u32 offload_ifindex = 0; 1533 bool auto_attach = false; 1534 struct bpf_object *obj; 1535 struct bpf_map *map; 1536 const char *pinfile; 1537 unsigned int i, j; 1538 const char *file; 1539 int idx, err; 1540 1541 1542 if (!REQ_ARGS(2)) 1543 return -1; 1544 file = GET_ARG(); 1545 pinfile = GET_ARG(); 1546 1547 while (argc) { 1548 if (is_prefix(*argv, "type")) { 1549 NEXT_ARG(); 1550 1551 if (common_prog_type != BPF_PROG_TYPE_UNSPEC) { 1552 p_err("program type already specified"); 1553 goto err_free_reuse_maps; 1554 } 1555 if (!REQ_ARGS(1)) 1556 goto err_free_reuse_maps; 1557 1558 err = libbpf_prog_type_by_name(*argv, &common_prog_type, 1559 &expected_attach_type); 1560 if (err < 0) { 1561 /* Put a '/' at the end of type to appease libbpf */ 1562 char *type = malloc(strlen(*argv) + 2); 1563 1564 if (!type) { 1565 p_err("mem alloc failed"); 1566 goto err_free_reuse_maps; 1567 } 1568 *type = 0; 1569 strcat(type, *argv); 1570 strcat(type, "/"); 1571 1572 err = get_prog_type_by_name(type, &common_prog_type, 1573 &expected_attach_type); 1574 free(type); 1575 if (err < 0) 1576 goto err_free_reuse_maps; 1577 } 1578 1579 NEXT_ARG(); 1580 } else if (is_prefix(*argv, "map")) { 1581 void *new_map_replace; 1582 char *endptr, *name; 1583 int fd; 1584 1585 NEXT_ARG(); 1586 1587 if (!REQ_ARGS(4)) 1588 goto err_free_reuse_maps; 1589 1590 if (is_prefix(*argv, "idx")) { 1591 NEXT_ARG(); 1592 1593 idx = strtoul(*argv, &endptr, 0); 1594 if (*endptr) { 1595 p_err("can't parse %s as IDX", *argv); 1596 goto err_free_reuse_maps; 1597 } 1598 name = NULL; 1599 } else if (is_prefix(*argv, "name")) { 1600 NEXT_ARG(); 1601 1602 name = *argv; 1603 idx = -1; 1604 } else { 1605 p_err("expected 'idx' or 'name', got: '%s'?", 1606 *argv); 1607 goto err_free_reuse_maps; 1608 } 1609 NEXT_ARG(); 1610 1611 fd = map_parse_fd(&argc, &argv); 1612 if (fd < 0) 1613 goto err_free_reuse_maps; 1614 1615 new_map_replace = libbpf_reallocarray(map_replace, 1616 old_map_fds + 1, 1617 sizeof(*map_replace)); 1618 if (!new_map_replace) { 1619 p_err("mem alloc failed"); 1620 goto err_free_reuse_maps; 1621 } 1622 map_replace = new_map_replace; 1623 1624 map_replace[old_map_fds].idx = idx; 1625 map_replace[old_map_fds].name = name; 1626 map_replace[old_map_fds].fd = fd; 1627 old_map_fds++; 1628 } else if (is_prefix(*argv, "dev")) { 1629 p_info("Warning: 'bpftool prog load [...] dev <ifname>' syntax is deprecated.\n" 1630 "Going further, please use 'offload_dev <ifname>' to offload program to device.\n" 1631 "For applications using XDP hints only, use 'xdpmeta_dev <ifname>'."); 1632 goto offload_dev; 1633 } else if (is_prefix(*argv, "offload_dev")) { 1634 offload_dev: 1635 NEXT_ARG(); 1636 1637 if (offload_ifindex) { 1638 p_err("offload_dev already specified"); 1639 goto err_free_reuse_maps; 1640 } else if (xdpmeta_ifindex) { 1641 p_err("xdpmeta_dev and offload_dev are mutually exclusive"); 1642 goto err_free_reuse_maps; 1643 } 1644 if (!REQ_ARGS(1)) 1645 goto err_free_reuse_maps; 1646 1647 offload_ifindex = if_nametoindex(*argv); 1648 if (!offload_ifindex) { 1649 p_err("unrecognized netdevice '%s': %s", 1650 *argv, strerror(errno)); 1651 goto err_free_reuse_maps; 1652 } 1653 NEXT_ARG(); 1654 } else if (is_prefix(*argv, "xdpmeta_dev")) { 1655 NEXT_ARG(); 1656 1657 if (xdpmeta_ifindex) { 1658 p_err("xdpmeta_dev already specified"); 1659 goto err_free_reuse_maps; 1660 } else if (offload_ifindex) { 1661 p_err("xdpmeta_dev and offload_dev are mutually exclusive"); 1662 goto err_free_reuse_maps; 1663 } 1664 if (!REQ_ARGS(1)) 1665 goto err_free_reuse_maps; 1666 1667 xdpmeta_ifindex = if_nametoindex(*argv); 1668 if (!xdpmeta_ifindex) { 1669 p_err("unrecognized netdevice '%s': %s", 1670 *argv, strerror(errno)); 1671 goto err_free_reuse_maps; 1672 } 1673 NEXT_ARG(); 1674 } else if (is_prefix(*argv, "pinmaps")) { 1675 NEXT_ARG(); 1676 1677 if (!REQ_ARGS(1)) 1678 goto err_free_reuse_maps; 1679 1680 pinmaps = GET_ARG(); 1681 } else if (is_prefix(*argv, "autoattach")) { 1682 auto_attach = true; 1683 NEXT_ARG(); 1684 } else if (is_prefix(*argv, "kernel_btf")) { 1685 NEXT_ARG(); 1686 1687 if (!REQ_ARGS(1)) 1688 goto err_free_reuse_maps; 1689 1690 open_opts.btf_custom_path = GET_ARG(); 1691 } else { 1692 p_err("expected no more arguments, " 1693 "'type', 'map', 'offload_dev', 'xdpmeta_dev', 'pinmaps', " 1694 "'autoattach', or 'kernel_btf', got: '%s'?", 1695 *argv); 1696 goto err_free_reuse_maps; 1697 } 1698 } 1699 1700 set_max_rlimit(); 1701 1702 if (verifier_logs) 1703 /* log_level1 + log_level2 + stats, but not stable UAPI */ 1704 open_opts.kernel_log_level = 1 + 2 + 4; 1705 1706 obj = bpf_object__open_file(file, &open_opts); 1707 if (!obj) { 1708 p_err("failed to open object file"); 1709 goto err_free_reuse_maps; 1710 } 1711 1712 bpf_object__for_each_program(pos, obj) { 1713 enum bpf_prog_type prog_type = common_prog_type; 1714 1715 if (prog_type == BPF_PROG_TYPE_UNSPEC) { 1716 const char *sec_name = bpf_program__section_name(pos); 1717 1718 err = get_prog_type_by_name(sec_name, &prog_type, 1719 &expected_attach_type); 1720 if (err < 0) 1721 goto err_close_obj; 1722 } 1723 1724 if (prog_type == BPF_PROG_TYPE_XDP && xdpmeta_ifindex) { 1725 bpf_program__set_flags(pos, BPF_F_XDP_DEV_BOUND_ONLY); 1726 bpf_program__set_ifindex(pos, xdpmeta_ifindex); 1727 } else { 1728 bpf_program__set_ifindex(pos, offload_ifindex); 1729 } 1730 if (bpf_program__type(pos) != prog_type) 1731 bpf_program__set_type(pos, prog_type); 1732 bpf_program__set_expected_attach_type(pos, expected_attach_type); 1733 } 1734 1735 qsort(map_replace, old_map_fds, sizeof(*map_replace), 1736 map_replace_compar); 1737 1738 /* After the sort maps by name will be first on the list, because they 1739 * have idx == -1. Resolve them. 1740 */ 1741 j = 0; 1742 while (j < old_map_fds && map_replace[j].name) { 1743 i = 0; 1744 bpf_object__for_each_map(map, obj) { 1745 if (!strcmp(bpf_map__name(map), map_replace[j].name)) { 1746 map_replace[j].idx = i; 1747 break; 1748 } 1749 i++; 1750 } 1751 if (map_replace[j].idx == -1) { 1752 p_err("unable to find map '%s'", map_replace[j].name); 1753 goto err_close_obj; 1754 } 1755 j++; 1756 } 1757 /* Resort if any names were resolved */ 1758 if (j) 1759 qsort(map_replace, old_map_fds, sizeof(*map_replace), 1760 map_replace_compar); 1761 1762 /* Set ifindex and name reuse */ 1763 j = 0; 1764 idx = 0; 1765 bpf_object__for_each_map(map, obj) { 1766 if (bpf_map__type(map) != BPF_MAP_TYPE_PERF_EVENT_ARRAY) 1767 bpf_map__set_ifindex(map, offload_ifindex); 1768 1769 if (j < old_map_fds && idx == map_replace[j].idx) { 1770 err = bpf_map__reuse_fd(map, map_replace[j++].fd); 1771 if (err) { 1772 p_err("unable to set up map reuse: %d", err); 1773 goto err_close_obj; 1774 } 1775 1776 /* Next reuse wants to apply to the same map */ 1777 if (j < old_map_fds && map_replace[j].idx == idx) { 1778 p_err("replacement for map idx %d specified more than once", 1779 idx); 1780 goto err_close_obj; 1781 } 1782 } 1783 1784 idx++; 1785 } 1786 if (j < old_map_fds) { 1787 p_err("map idx '%d' not used", map_replace[j].idx); 1788 goto err_close_obj; 1789 } 1790 1791 err = bpf_object__load(obj); 1792 if (err) { 1793 p_err("failed to load object file"); 1794 goto err_close_obj; 1795 } 1796 1797 if (first_prog_only) 1798 err = mount_bpffs_for_file(pinfile); 1799 else 1800 err = create_and_mount_bpffs_dir(pinfile); 1801 if (err) 1802 goto err_close_obj; 1803 1804 if (first_prog_only) { 1805 prog = bpf_object__next_program(obj, NULL); 1806 if (!prog) { 1807 p_err("object file doesn't contain any bpf program"); 1808 goto err_close_obj; 1809 } 1810 1811 if (auto_attach) 1812 err = auto_attach_program(prog, pinfile); 1813 else 1814 err = bpf_obj_pin(bpf_program__fd(prog), pinfile); 1815 if (err) { 1816 p_err("failed to pin program %s", 1817 bpf_program__section_name(prog)); 1818 goto err_close_obj; 1819 } 1820 } else { 1821 if (auto_attach) 1822 err = auto_attach_programs(obj, pinfile); 1823 else 1824 err = bpf_object__pin_programs(obj, pinfile); 1825 if (err) { 1826 p_err("failed to pin all programs"); 1827 goto err_close_obj; 1828 } 1829 } 1830 1831 if (pinmaps) { 1832 err = create_and_mount_bpffs_dir(pinmaps); 1833 if (err) 1834 goto err_unpin; 1835 1836 err = bpf_object__pin_maps(obj, pinmaps); 1837 if (err) { 1838 p_err("failed to pin all maps"); 1839 goto err_unpin; 1840 } 1841 } 1842 1843 if (json_output) 1844 jsonw_null(json_wtr); 1845 1846 bpf_object__close(obj); 1847 for (i = 0; i < old_map_fds; i++) 1848 close(map_replace[i].fd); 1849 free(map_replace); 1850 1851 return 0; 1852 1853 err_unpin: 1854 if (first_prog_only) 1855 unlink(pinfile); 1856 else 1857 bpf_object__unpin_programs(obj, pinfile); 1858 err_close_obj: 1859 bpf_object__close(obj); 1860 err_free_reuse_maps: 1861 for (i = 0; i < old_map_fds; i++) 1862 close(map_replace[i].fd); 1863 free(map_replace); 1864 return -1; 1865 } 1866 1867 static int count_open_fds(void) 1868 { 1869 DIR *dp = opendir("/proc/self/fd"); 1870 struct dirent *de; 1871 int cnt = -3; 1872 1873 if (!dp) 1874 return -1; 1875 1876 while ((de = readdir(dp))) 1877 cnt++; 1878 1879 closedir(dp); 1880 return cnt; 1881 } 1882 1883 static int try_loader(struct gen_loader_opts *gen) 1884 { 1885 struct bpf_load_and_run_opts opts = {}; 1886 struct bpf_loader_ctx *ctx; 1887 int ctx_sz = sizeof(*ctx) + 64 * max(sizeof(struct bpf_map_desc), 1888 sizeof(struct bpf_prog_desc)); 1889 int log_buf_sz = (1u << 24) - 1; 1890 int err, fds_before, fd_delta; 1891 char *log_buf = NULL; 1892 1893 ctx = alloca(ctx_sz); 1894 memset(ctx, 0, ctx_sz); 1895 ctx->sz = ctx_sz; 1896 if (verifier_logs) { 1897 ctx->log_level = 1 + 2 + 4; 1898 ctx->log_size = log_buf_sz; 1899 log_buf = malloc(log_buf_sz); 1900 if (!log_buf) 1901 return -ENOMEM; 1902 ctx->log_buf = (long) log_buf; 1903 } 1904 opts.ctx = ctx; 1905 opts.data = gen->data; 1906 opts.data_sz = gen->data_sz; 1907 opts.insns = gen->insns; 1908 opts.insns_sz = gen->insns_sz; 1909 fds_before = count_open_fds(); 1910 err = bpf_load_and_run(&opts); 1911 fd_delta = count_open_fds() - fds_before; 1912 if (err < 0 || verifier_logs) { 1913 fprintf(stderr, "err %d\n%s\n%s", err, opts.errstr, log_buf); 1914 if (fd_delta && err < 0) 1915 fprintf(stderr, "loader prog leaked %d FDs\n", 1916 fd_delta); 1917 } 1918 free(log_buf); 1919 return err; 1920 } 1921 1922 static int do_loader(int argc, char **argv) 1923 { 1924 DECLARE_LIBBPF_OPTS(bpf_object_open_opts, open_opts); 1925 DECLARE_LIBBPF_OPTS(gen_loader_opts, gen); 1926 struct bpf_object *obj; 1927 const char *file; 1928 int err = 0; 1929 1930 if (!REQ_ARGS(1)) 1931 return -1; 1932 file = GET_ARG(); 1933 1934 if (verifier_logs) 1935 /* log_level1 + log_level2 + stats, but not stable UAPI */ 1936 open_opts.kernel_log_level = 1 + 2 + 4; 1937 1938 obj = bpf_object__open_file(file, &open_opts); 1939 if (!obj) { 1940 err = -1; 1941 p_err("failed to open object file"); 1942 goto err_close_obj; 1943 } 1944 1945 err = bpf_object__gen_loader(obj, &gen); 1946 if (err) 1947 goto err_close_obj; 1948 1949 err = bpf_object__load(obj); 1950 if (err) { 1951 p_err("failed to load object file"); 1952 goto err_close_obj; 1953 } 1954 1955 if (verifier_logs) { 1956 struct dump_data dd = {}; 1957 1958 kernel_syms_load(&dd); 1959 dump_xlated_plain(&dd, (void *)gen.insns, gen.insns_sz, false, false); 1960 kernel_syms_destroy(&dd); 1961 } 1962 err = try_loader(&gen); 1963 err_close_obj: 1964 bpf_object__close(obj); 1965 return err; 1966 } 1967 1968 static int do_load(int argc, char **argv) 1969 { 1970 if (use_loader) 1971 return do_loader(argc, argv); 1972 return load_with_options(argc, argv, true); 1973 } 1974 1975 static int do_loadall(int argc, char **argv) 1976 { 1977 return load_with_options(argc, argv, false); 1978 } 1979 1980 #ifdef BPFTOOL_WITHOUT_SKELETONS 1981 1982 static int do_profile(int argc, char **argv) 1983 { 1984 p_err("bpftool prog profile command is not supported. Please build bpftool with clang >= 10.0.0"); 1985 return 0; 1986 } 1987 1988 #else /* BPFTOOL_WITHOUT_SKELETONS */ 1989 1990 #include "profiler.skel.h" 1991 1992 struct profile_metric { 1993 const char *name; 1994 struct bpf_perf_event_value val; 1995 struct perf_event_attr attr; 1996 bool selected; 1997 1998 /* calculate ratios like instructions per cycle */ 1999 const int ratio_metric; /* 0 for N/A, 1 for index 0 (cycles) */ 2000 const char *ratio_desc; 2001 const float ratio_mul; 2002 } metrics[] = { 2003 { 2004 .name = "cycles", 2005 .attr = { 2006 .type = PERF_TYPE_HARDWARE, 2007 .config = PERF_COUNT_HW_CPU_CYCLES, 2008 .exclude_user = 1, 2009 }, 2010 }, 2011 { 2012 .name = "instructions", 2013 .attr = { 2014 .type = PERF_TYPE_HARDWARE, 2015 .config = PERF_COUNT_HW_INSTRUCTIONS, 2016 .exclude_user = 1, 2017 }, 2018 .ratio_metric = 1, 2019 .ratio_desc = "insns per cycle", 2020 .ratio_mul = 1.0, 2021 }, 2022 { 2023 .name = "l1d_loads", 2024 .attr = { 2025 .type = PERF_TYPE_HW_CACHE, 2026 .config = 2027 PERF_COUNT_HW_CACHE_L1D | 2028 (PERF_COUNT_HW_CACHE_OP_READ << 8) | 2029 (PERF_COUNT_HW_CACHE_RESULT_ACCESS << 16), 2030 .exclude_user = 1, 2031 }, 2032 }, 2033 { 2034 .name = "llc_misses", 2035 .attr = { 2036 .type = PERF_TYPE_HW_CACHE, 2037 .config = 2038 PERF_COUNT_HW_CACHE_LL | 2039 (PERF_COUNT_HW_CACHE_OP_READ << 8) | 2040 (PERF_COUNT_HW_CACHE_RESULT_MISS << 16), 2041 .exclude_user = 1 2042 }, 2043 .ratio_metric = 2, 2044 .ratio_desc = "LLC misses per million insns", 2045 .ratio_mul = 1e6, 2046 }, 2047 { 2048 .name = "itlb_misses", 2049 .attr = { 2050 .type = PERF_TYPE_HW_CACHE, 2051 .config = 2052 PERF_COUNT_HW_CACHE_ITLB | 2053 (PERF_COUNT_HW_CACHE_OP_READ << 8) | 2054 (PERF_COUNT_HW_CACHE_RESULT_MISS << 16), 2055 .exclude_user = 1 2056 }, 2057 .ratio_metric = 2, 2058 .ratio_desc = "itlb misses per million insns", 2059 .ratio_mul = 1e6, 2060 }, 2061 { 2062 .name = "dtlb_misses", 2063 .attr = { 2064 .type = PERF_TYPE_HW_CACHE, 2065 .config = 2066 PERF_COUNT_HW_CACHE_DTLB | 2067 (PERF_COUNT_HW_CACHE_OP_READ << 8) | 2068 (PERF_COUNT_HW_CACHE_RESULT_MISS << 16), 2069 .exclude_user = 1 2070 }, 2071 .ratio_metric = 2, 2072 .ratio_desc = "dtlb misses per million insns", 2073 .ratio_mul = 1e6, 2074 }, 2075 }; 2076 2077 static __u64 profile_total_count; 2078 2079 #define MAX_NUM_PROFILE_METRICS 4 2080 2081 static int profile_parse_metrics(int argc, char **argv) 2082 { 2083 unsigned int metric_cnt; 2084 int selected_cnt = 0; 2085 unsigned int i; 2086 2087 metric_cnt = ARRAY_SIZE(metrics); 2088 2089 while (argc > 0) { 2090 for (i = 0; i < metric_cnt; i++) { 2091 if (is_prefix(argv[0], metrics[i].name)) { 2092 if (!metrics[i].selected) 2093 selected_cnt++; 2094 metrics[i].selected = true; 2095 break; 2096 } 2097 } 2098 if (i == metric_cnt) { 2099 p_err("unknown metric %s", argv[0]); 2100 return -1; 2101 } 2102 NEXT_ARG(); 2103 } 2104 if (selected_cnt > MAX_NUM_PROFILE_METRICS) { 2105 p_err("too many (%d) metrics, please specify no more than %d metrics at a time", 2106 selected_cnt, MAX_NUM_PROFILE_METRICS); 2107 return -1; 2108 } 2109 return selected_cnt; 2110 } 2111 2112 static void profile_read_values(struct profiler_bpf *obj) 2113 { 2114 __u32 m, cpu, num_cpu = obj->rodata->num_cpu; 2115 int reading_map_fd, count_map_fd; 2116 __u64 counts[num_cpu]; 2117 __u32 key = 0; 2118 int err; 2119 2120 reading_map_fd = bpf_map__fd(obj->maps.accum_readings); 2121 count_map_fd = bpf_map__fd(obj->maps.counts); 2122 if (reading_map_fd < 0 || count_map_fd < 0) { 2123 p_err("failed to get fd for map"); 2124 return; 2125 } 2126 2127 err = bpf_map_lookup_elem(count_map_fd, &key, counts); 2128 if (err) { 2129 p_err("failed to read count_map: %s", strerror(errno)); 2130 return; 2131 } 2132 2133 profile_total_count = 0; 2134 for (cpu = 0; cpu < num_cpu; cpu++) 2135 profile_total_count += counts[cpu]; 2136 2137 for (m = 0; m < ARRAY_SIZE(metrics); m++) { 2138 struct bpf_perf_event_value values[num_cpu]; 2139 2140 if (!metrics[m].selected) 2141 continue; 2142 2143 err = bpf_map_lookup_elem(reading_map_fd, &key, values); 2144 if (err) { 2145 p_err("failed to read reading_map: %s", 2146 strerror(errno)); 2147 return; 2148 } 2149 for (cpu = 0; cpu < num_cpu; cpu++) { 2150 metrics[m].val.counter += values[cpu].counter; 2151 metrics[m].val.enabled += values[cpu].enabled; 2152 metrics[m].val.running += values[cpu].running; 2153 } 2154 key++; 2155 } 2156 } 2157 2158 static void profile_print_readings_json(void) 2159 { 2160 __u32 m; 2161 2162 jsonw_start_array(json_wtr); 2163 for (m = 0; m < ARRAY_SIZE(metrics); m++) { 2164 if (!metrics[m].selected) 2165 continue; 2166 jsonw_start_object(json_wtr); 2167 jsonw_string_field(json_wtr, "metric", metrics[m].name); 2168 jsonw_lluint_field(json_wtr, "run_cnt", profile_total_count); 2169 jsonw_lluint_field(json_wtr, "value", metrics[m].val.counter); 2170 jsonw_lluint_field(json_wtr, "enabled", metrics[m].val.enabled); 2171 jsonw_lluint_field(json_wtr, "running", metrics[m].val.running); 2172 2173 jsonw_end_object(json_wtr); 2174 } 2175 jsonw_end_array(json_wtr); 2176 } 2177 2178 static void profile_print_readings_plain(void) 2179 { 2180 __u32 m; 2181 2182 printf("\n%18llu %-20s\n", profile_total_count, "run_cnt"); 2183 for (m = 0; m < ARRAY_SIZE(metrics); m++) { 2184 struct bpf_perf_event_value *val = &metrics[m].val; 2185 int r; 2186 2187 if (!metrics[m].selected) 2188 continue; 2189 printf("%18llu %-20s", val->counter, metrics[m].name); 2190 2191 r = metrics[m].ratio_metric - 1; 2192 if (r >= 0 && metrics[r].selected && 2193 metrics[r].val.counter > 0) { 2194 printf("# %8.2f %-30s", 2195 val->counter * metrics[m].ratio_mul / 2196 metrics[r].val.counter, 2197 metrics[m].ratio_desc); 2198 } else { 2199 printf("%-41s", ""); 2200 } 2201 2202 if (val->enabled > val->running) 2203 printf("(%4.2f%%)", 2204 val->running * 100.0 / val->enabled); 2205 printf("\n"); 2206 } 2207 } 2208 2209 static void profile_print_readings(void) 2210 { 2211 if (json_output) 2212 profile_print_readings_json(); 2213 else 2214 profile_print_readings_plain(); 2215 } 2216 2217 static char *profile_target_name(int tgt_fd) 2218 { 2219 struct bpf_func_info func_info; 2220 struct bpf_prog_info info = {}; 2221 __u32 info_len = sizeof(info); 2222 const struct btf_type *t; 2223 __u32 func_info_rec_size; 2224 struct btf *btf = NULL; 2225 char *name = NULL; 2226 int err; 2227 2228 err = bpf_prog_get_info_by_fd(tgt_fd, &info, &info_len); 2229 if (err) { 2230 p_err("failed to get info for prog FD %d", tgt_fd); 2231 goto out; 2232 } 2233 2234 if (info.btf_id == 0) { 2235 p_err("prog FD %d doesn't have valid btf", tgt_fd); 2236 goto out; 2237 } 2238 2239 func_info_rec_size = info.func_info_rec_size; 2240 if (info.nr_func_info == 0) { 2241 p_err("found 0 func_info for prog FD %d", tgt_fd); 2242 goto out; 2243 } 2244 2245 memset(&info, 0, sizeof(info)); 2246 info.nr_func_info = 1; 2247 info.func_info_rec_size = func_info_rec_size; 2248 info.func_info = ptr_to_u64(&func_info); 2249 2250 err = bpf_prog_get_info_by_fd(tgt_fd, &info, &info_len); 2251 if (err) { 2252 p_err("failed to get func_info for prog FD %d", tgt_fd); 2253 goto out; 2254 } 2255 2256 btf = btf__load_from_kernel_by_id(info.btf_id); 2257 if (!btf) { 2258 p_err("failed to load btf for prog FD %d", tgt_fd); 2259 goto out; 2260 } 2261 2262 t = btf__type_by_id(btf, func_info.type_id); 2263 if (!t) { 2264 p_err("btf %u doesn't have type %u", 2265 info.btf_id, func_info.type_id); 2266 goto out; 2267 } 2268 name = strdup(btf__name_by_offset(btf, t->name_off)); 2269 out: 2270 btf__free(btf); 2271 return name; 2272 } 2273 2274 static struct profiler_bpf *profile_obj; 2275 static int profile_tgt_fd = -1; 2276 static char *profile_tgt_name; 2277 static int *profile_perf_events; 2278 static int profile_perf_event_cnt; 2279 2280 static void profile_close_perf_events(struct profiler_bpf *obj) 2281 { 2282 int i; 2283 2284 for (i = profile_perf_event_cnt - 1; i >= 0; i--) 2285 close(profile_perf_events[i]); 2286 2287 free(profile_perf_events); 2288 profile_perf_event_cnt = 0; 2289 } 2290 2291 static int profile_open_perf_event(int mid, int cpu, int map_fd) 2292 { 2293 int pmu_fd; 2294 2295 pmu_fd = syscall(__NR_perf_event_open, &metrics[mid].attr, 2296 -1 /*pid*/, cpu, -1 /*group_fd*/, 0); 2297 if (pmu_fd < 0) { 2298 if (errno == ENODEV) { 2299 p_info("cpu %d may be offline, skip %s profiling.", 2300 cpu, metrics[mid].name); 2301 profile_perf_event_cnt++; 2302 return 0; 2303 } 2304 return -1; 2305 } 2306 2307 if (bpf_map_update_elem(map_fd, 2308 &profile_perf_event_cnt, 2309 &pmu_fd, BPF_ANY) || 2310 ioctl(pmu_fd, PERF_EVENT_IOC_ENABLE, 0)) { 2311 close(pmu_fd); 2312 return -1; 2313 } 2314 2315 profile_perf_events[profile_perf_event_cnt++] = pmu_fd; 2316 return 0; 2317 } 2318 2319 static int profile_open_perf_events(struct profiler_bpf *obj) 2320 { 2321 unsigned int cpu, m; 2322 int map_fd; 2323 2324 profile_perf_events = calloc( 2325 obj->rodata->num_cpu * obj->rodata->num_metric, sizeof(int)); 2326 if (!profile_perf_events) { 2327 p_err("failed to allocate memory for perf_event array: %s", 2328 strerror(errno)); 2329 return -1; 2330 } 2331 map_fd = bpf_map__fd(obj->maps.events); 2332 if (map_fd < 0) { 2333 p_err("failed to get fd for events map"); 2334 return -1; 2335 } 2336 2337 for (m = 0; m < ARRAY_SIZE(metrics); m++) { 2338 if (!metrics[m].selected) 2339 continue; 2340 for (cpu = 0; cpu < obj->rodata->num_cpu; cpu++) { 2341 if (profile_open_perf_event(m, cpu, map_fd)) { 2342 p_err("failed to create event %s on cpu %u", 2343 metrics[m].name, cpu); 2344 return -1; 2345 } 2346 } 2347 } 2348 return 0; 2349 } 2350 2351 static void profile_print_and_cleanup(void) 2352 { 2353 profile_close_perf_events(profile_obj); 2354 profile_read_values(profile_obj); 2355 profile_print_readings(); 2356 profiler_bpf__destroy(profile_obj); 2357 2358 close(profile_tgt_fd); 2359 free(profile_tgt_name); 2360 } 2361 2362 static void int_exit(int signo) 2363 { 2364 profile_print_and_cleanup(); 2365 exit(0); 2366 } 2367 2368 static int do_profile(int argc, char **argv) 2369 { 2370 int num_metric, num_cpu, err = -1; 2371 struct bpf_program *prog; 2372 unsigned long duration; 2373 char *endptr; 2374 2375 /* we at least need two args for the prog and one metric */ 2376 if (!REQ_ARGS(3)) 2377 return -EINVAL; 2378 2379 /* parse target fd */ 2380 profile_tgt_fd = prog_parse_fd(&argc, &argv); 2381 if (profile_tgt_fd < 0) { 2382 p_err("failed to parse fd"); 2383 return -1; 2384 } 2385 2386 /* parse profiling optional duration */ 2387 if (argc > 2 && is_prefix(argv[0], "duration")) { 2388 NEXT_ARG(); 2389 duration = strtoul(*argv, &endptr, 0); 2390 if (*endptr) 2391 usage(); 2392 NEXT_ARG(); 2393 } else { 2394 duration = UINT_MAX; 2395 } 2396 2397 num_metric = profile_parse_metrics(argc, argv); 2398 if (num_metric <= 0) 2399 goto out; 2400 2401 num_cpu = libbpf_num_possible_cpus(); 2402 if (num_cpu <= 0) { 2403 p_err("failed to identify number of CPUs"); 2404 goto out; 2405 } 2406 2407 profile_obj = profiler_bpf__open(); 2408 if (!profile_obj) { 2409 p_err("failed to open and/or load BPF object"); 2410 goto out; 2411 } 2412 2413 profile_obj->rodata->num_cpu = num_cpu; 2414 profile_obj->rodata->num_metric = num_metric; 2415 2416 /* adjust map sizes */ 2417 bpf_map__set_max_entries(profile_obj->maps.events, num_metric * num_cpu); 2418 bpf_map__set_max_entries(profile_obj->maps.fentry_readings, num_metric); 2419 bpf_map__set_max_entries(profile_obj->maps.accum_readings, num_metric); 2420 bpf_map__set_max_entries(profile_obj->maps.counts, 1); 2421 2422 /* change target name */ 2423 profile_tgt_name = profile_target_name(profile_tgt_fd); 2424 if (!profile_tgt_name) 2425 goto out; 2426 2427 bpf_object__for_each_program(prog, profile_obj->obj) { 2428 err = bpf_program__set_attach_target(prog, profile_tgt_fd, 2429 profile_tgt_name); 2430 if (err) { 2431 p_err("failed to set attach target\n"); 2432 goto out; 2433 } 2434 } 2435 2436 set_max_rlimit(); 2437 err = profiler_bpf__load(profile_obj); 2438 if (err) { 2439 p_err("failed to load profile_obj"); 2440 goto out; 2441 } 2442 2443 err = profile_open_perf_events(profile_obj); 2444 if (err) 2445 goto out; 2446 2447 err = profiler_bpf__attach(profile_obj); 2448 if (err) { 2449 p_err("failed to attach profile_obj"); 2450 goto out; 2451 } 2452 signal(SIGINT, int_exit); 2453 2454 sleep(duration); 2455 profile_print_and_cleanup(); 2456 return 0; 2457 2458 out: 2459 profile_close_perf_events(profile_obj); 2460 if (profile_obj) 2461 profiler_bpf__destroy(profile_obj); 2462 close(profile_tgt_fd); 2463 free(profile_tgt_name); 2464 return err; 2465 } 2466 2467 #endif /* BPFTOOL_WITHOUT_SKELETONS */ 2468 2469 static int do_help(int argc, char **argv) 2470 { 2471 if (json_output) { 2472 jsonw_null(json_wtr); 2473 return 0; 2474 } 2475 2476 fprintf(stderr, 2477 "Usage: %1$s %2$s { show | list } [PROG]\n" 2478 " %1$s %2$s dump xlated PROG [{ file FILE | [opcodes] [linum] [visual] }]\n" 2479 " %1$s %2$s dump jited PROG [{ file FILE | [opcodes] [linum] }]\n" 2480 " %1$s %2$s pin PROG FILE\n" 2481 " %1$s %2$s { load | loadall } OBJ PATH \\\n" 2482 " [type TYPE] [{ offload_dev | xdpmeta_dev } NAME] \\\n" 2483 " [map { idx IDX | name NAME } MAP]\\\n" 2484 " [pinmaps MAP_DIR]\n" 2485 " [autoattach]\n" 2486 " [kernel_btf BTF_FILE]\n" 2487 " %1$s %2$s attach PROG ATTACH_TYPE [MAP]\n" 2488 " %1$s %2$s detach PROG ATTACH_TYPE [MAP]\n" 2489 " %1$s %2$s run PROG \\\n" 2490 " data_in FILE \\\n" 2491 " [data_out FILE [data_size_out L]] \\\n" 2492 " [ctx_in FILE [ctx_out FILE [ctx_size_out M]]] \\\n" 2493 " [repeat N]\n" 2494 " %1$s %2$s profile PROG [duration DURATION] METRICs\n" 2495 " %1$s %2$s tracelog\n" 2496 " %1$s %2$s help\n" 2497 "\n" 2498 " " HELP_SPEC_MAP "\n" 2499 " " HELP_SPEC_PROGRAM "\n" 2500 " TYPE := { socket | kprobe | kretprobe | classifier | action |\n" 2501 " tracepoint | raw_tracepoint | xdp | perf_event | cgroup/skb |\n" 2502 " cgroup/sock | cgroup/dev | lwt_in | lwt_out | lwt_xmit |\n" 2503 " lwt_seg6local | sockops | sk_skb | sk_msg | lirc_mode2 |\n" 2504 " sk_reuseport | flow_dissector | cgroup/sysctl |\n" 2505 " cgroup/bind4 | cgroup/bind6 | cgroup/post_bind4 |\n" 2506 " cgroup/post_bind6 | cgroup/connect4 | cgroup/connect6 |\n" 2507 " cgroup/connect_unix | cgroup/getpeername4 | cgroup/getpeername6 |\n" 2508 " cgroup/getpeername_unix | cgroup/getsockname4 | cgroup/getsockname6 |\n" 2509 " cgroup/getsockname_unix | cgroup/sendmsg4 | cgroup/sendmsg6 |\n" 2510 " cgroup/sendmsg_unix | cgroup/recvmsg4 | cgroup/recvmsg6 | cgroup/recvmsg_unix |\n" 2511 " cgroup/getsockopt | cgroup/setsockopt | cgroup/sock_release |\n" 2512 " struct_ops | fentry | fexit | freplace | sk_lookup }\n" 2513 " ATTACH_TYPE := { sk_msg_verdict | sk_skb_verdict | sk_skb_stream_verdict |\n" 2514 " sk_skb_stream_parser | flow_dissector }\n" 2515 " METRIC := { cycles | instructions | l1d_loads | llc_misses | itlb_misses | dtlb_misses }\n" 2516 " " HELP_SPEC_OPTIONS " |\n" 2517 " {-f|--bpffs} | {-m|--mapcompat} | {-n|--nomount} |\n" 2518 " {-L|--use-loader} }\n" 2519 "", 2520 bin_name, argv[-2]); 2521 2522 return 0; 2523 } 2524 2525 static const struct cmd cmds[] = { 2526 { "show", do_show }, 2527 { "list", do_show }, 2528 { "help", do_help }, 2529 { "dump", do_dump }, 2530 { "pin", do_pin }, 2531 { "load", do_load }, 2532 { "loadall", do_loadall }, 2533 { "attach", do_attach }, 2534 { "detach", do_detach }, 2535 { "tracelog", do_tracelog }, 2536 { "run", do_run }, 2537 { "profile", do_profile }, 2538 { 0 } 2539 }; 2540 2541 int do_prog(int argc, char **argv) 2542 { 2543 return cmd_select(cmds, argc, argv, do_help); 2544 } 2545