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