1 2 /* 3 * Copyright (C) Max Romanov 4 * Copyright (C) NGINX, Inc. 5 */ 6 7 #include <nxt_main.h> 8 9 #if (NXT_HAVE_MEMFD_CREATE) 10 11 #include <linux/memfd.h> 12 #include <unistd.h> 13 #include <sys/syscall.h> 14 15 #endif 16 17 #include <nxt_port_memory_int.h> 18 19 20 nxt_inline void 21 nxt_port_mmap_handler_use(nxt_port_mmap_handler_t *mmap_handler, int i) 22 { 23 int c; 24 25 c = nxt_atomic_fetch_add(&mmap_handler->use_count, i); 26 27 if (i < 0 && c == -i) { 28 if (mmap_handler->hdr != NULL) { 29 nxt_mem_munmap(mmap_handler->hdr, PORT_MMAP_SIZE); 30 mmap_handler->hdr = NULL; 31 } 32 33 nxt_free(mmap_handler); 34 } 35 } 36 37 38 static nxt_port_mmap_t * 39 nxt_port_mmap_at(nxt_port_mmaps_t *port_mmaps, uint32_t i) 40 { 41 uint32_t cap; 42 43 cap = port_mmaps->cap; 44 45 if (cap == 0) { 46 cap = i + 1; 47 } 48 49 while (i + 1 > cap) { 50 51 if (cap < 16) { 52 cap = cap * 2; 53 54 } else { 55 cap = cap + cap / 2; 56 } 57 } 58 59 if (cap != port_mmaps->cap) { 60 61 port_mmaps->elts = nxt_realloc(port_mmaps->elts, 62 cap * sizeof(nxt_port_mmap_t)); 63 if (nxt_slow_path(port_mmaps->elts == NULL)) { 64 return NULL; 65 } 66 67 nxt_memzero(port_mmaps->elts + port_mmaps->cap, 68 sizeof(nxt_port_mmap_t) * (cap - port_mmaps->cap)); 69 70 port_mmaps->cap = cap; 71 } 72 73 if (i + 1 > port_mmaps->size) { 74 port_mmaps->size = i + 1; 75 } 76 77 return port_mmaps->elts + i; 78 } 79 80 81 void 82 nxt_port_mmaps_destroy(nxt_port_mmaps_t *port_mmaps, nxt_bool_t free_elts) 83 { 84 uint32_t i; 85 nxt_port_mmap_t *port_mmap; 86 87 if (port_mmaps == NULL) { 88 return; 89 } 90 91 port_mmap = port_mmaps->elts; 92 93 for (i = 0; i < port_mmaps->size; i++) { 94 nxt_port_mmap_handler_use(port_mmap[i].mmap_handler, -1); 95 } 96 97 port_mmaps->size = 0; 98 99 if (free_elts != 0) { 100 nxt_free(port_mmaps->elts); 101 } 102 } 103 104 105 #define nxt_port_mmap_free_junk(p, size) \ 106 memset((p), 0xA5, size) 107 108 109 static void 110 nxt_port_mmap_buf_completion(nxt_task_t *task, void *obj, void *data) 111 { 112 u_char *p; 113 nxt_mp_t *mp; 114 nxt_buf_t *b; 115 nxt_chunk_id_t c; 116 nxt_port_mmap_header_t *hdr; 117 nxt_port_mmap_handler_t *mmap_handler; 118 119 if (nxt_buf_ts_handle(task, obj, data)) { 120 return; 121 } 122 123 b = obj; 124 125 mp = b->data; 126 127 nxt_assert(data == b->parent); 128 129 mmap_handler = data; 130 hdr = mmap_handler->hdr; 131 132 if (nxt_slow_path(hdr->src_pid != nxt_pid && hdr->dst_pid != nxt_pid)) { 133 nxt_debug(task, "mmap buf completion: mmap for other process pair " 134 "%PI->%PI", hdr->src_pid, hdr->dst_pid); 135 136 goto release_buf; 137 } 138 139 if (b->is_port_mmap_sent && b->mem.pos > b->mem.start) { 140 /* 141 * Chunks until b->mem.pos has been sent to other side, 142 * let's release rest (if any). 143 */ 144 p = b->mem.pos - 1; 145 c = nxt_port_mmap_chunk_id(hdr, p) + 1; 146 p = nxt_port_mmap_chunk_start(hdr, c); 147 148 } else { 149 p = b->mem.start; 150 c = nxt_port_mmap_chunk_id(hdr, p); 151 } 152 153 nxt_port_mmap_free_junk(p, b->mem.end - p); 154 155 nxt_debug(task, "mmap buf completion: %p [%p,%uz] (sent=%d), " 156 "%PI->%PI,%d,%d", b, b->mem.start, b->mem.end - b->mem.start, 157 b->is_port_mmap_sent, hdr->src_pid, hdr->dst_pid, hdr->id, c); 158 159 while (p < b->mem.end) { 160 nxt_port_mmap_set_chunk_free(hdr->free_map, c); 161 162 p += PORT_MMAP_CHUNK_SIZE; 163 c++; 164 } 165 166 release_buf: 167 168 nxt_port_mmap_handler_use(mmap_handler, -1); 169 170 nxt_mp_free(mp, b); 171 nxt_mp_release(mp); 172 } 173 174 175 nxt_port_mmap_handler_t * 176 nxt_port_incoming_port_mmap(nxt_task_t *task, nxt_process_t *process, 177 nxt_fd_t fd) 178 { 179 void *mem; 180 struct stat mmap_stat; 181 nxt_port_mmap_t *port_mmap; 182 nxt_port_mmap_header_t *hdr; 183 nxt_port_mmap_handler_t *mmap_handler; 184 185 nxt_debug(task, "got new mmap fd #%FD from process %PI", 186 fd, process->pid); 187 188 port_mmap = NULL; 189 190 if (fstat(fd, &mmap_stat) == -1) { 191 nxt_log(task, NXT_LOG_WARN, "fstat(%FD) failed %E", fd, nxt_errno); 192 193 return NULL; 194 } 195 196 mem = nxt_mem_mmap(NULL, mmap_stat.st_size, 197 PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0); 198 199 if (nxt_slow_path(mem == MAP_FAILED)) { 200 nxt_log(task, NXT_LOG_WARN, "mmap() failed %E", nxt_errno); 201 202 return NULL; 203 } 204 205 hdr = mem; 206 207 mmap_handler = nxt_zalloc(sizeof(nxt_port_mmap_handler_t)); 208 if (nxt_slow_path(mmap_handler == NULL)) { 209 nxt_log(task, NXT_LOG_WARN, "failed to allocate mmap_handler"); 210 211 nxt_mem_munmap(mem, PORT_MMAP_SIZE); 212 213 return NULL; 214 } 215 216 mmap_handler->hdr = hdr; 217 218 if (nxt_slow_path(hdr->src_pid != process->pid 219 || hdr->dst_pid != nxt_pid)) 220 { 221 nxt_log(task, NXT_LOG_WARN, "unexpected pid in mmap header detected: " 222 "%PI != %PI or %PI != %PI", hdr->src_pid, process->pid, 223 hdr->dst_pid, nxt_pid); 224 225 return NULL; 226 } 227 228 nxt_thread_mutex_lock(&process->incoming.mutex); 229 230 port_mmap = nxt_port_mmap_at(&process->incoming, hdr->id); 231 if (nxt_slow_path(port_mmap == NULL)) { 232 nxt_log(task, NXT_LOG_WARN, "failed to add mmap to incoming array"); 233 234 nxt_mem_munmap(mem, PORT_MMAP_SIZE); 235 hdr = NULL; 236 237 nxt_free(mmap_handler); 238 mmap_handler = NULL; 239 240 goto fail; 241 } 242 243 port_mmap->mmap_handler = mmap_handler; 244 nxt_port_mmap_handler_use(mmap_handler, 1); 245 246 hdr->sent_over = 0xFFFFu; 247 248 fail: 249 250 nxt_thread_mutex_unlock(&process->incoming.mutex); 251 252 return mmap_handler; 253 } 254 255 256 static nxt_port_mmap_handler_t * 257 nxt_port_new_port_mmap(nxt_task_t *task, nxt_process_t *process, 258 nxt_port_t *port, nxt_bool_t tracking) 259 { 260 void *mem; 261 u_char *p, name[64]; 262 nxt_fd_t fd; 263 nxt_free_map_t *free_map; 264 nxt_port_mmap_t *port_mmap; 265 nxt_port_mmap_header_t *hdr; 266 nxt_port_mmap_handler_t *mmap_handler; 267 268 mmap_handler = nxt_zalloc(sizeof(nxt_port_mmap_handler_t)); 269 if (nxt_slow_path(mmap_handler == NULL)) { 270 nxt_log(task, NXT_LOG_WARN, "failed to allocate mmap_handler"); 271 272 return NULL; 273 } 274 275 port_mmap = nxt_port_mmap_at(&process->outgoing, process->outgoing.size); 276 if (nxt_slow_path(port_mmap == NULL)) { 277 nxt_log(task, NXT_LOG_WARN, 278 "failed to add port mmap to outgoing array"); 279 280 nxt_free(mmap_handler); 281 return NULL; 282 } 283 284 p = nxt_sprintf(name, name + sizeof(name), NXT_SHM_PREFIX "unit.%PI.%uxD", 285 nxt_pid, nxt_random(&task->thread->random)); 286 *p = '\0'; 287 288 #if (NXT_HAVE_MEMFD_CREATE) 289 290 fd = syscall(SYS_memfd_create, name, MFD_CLOEXEC); 291 292 if (nxt_slow_path(fd == -1)) { 293 nxt_alert(task, "memfd_create(%s) failed %E", name, nxt_errno); 294 295 goto remove_fail; 296 } 297 298 nxt_debug(task, "memfd_create(%s): %FD", name, fd); 299 300 #elif (NXT_HAVE_SHM_OPEN_ANON) 301 302 fd = shm_open(SHM_ANON, O_RDWR, S_IRUSR | S_IWUSR); 303 304 nxt_debug(task, "shm_open(SHM_ANON): %FD", fd); 305 306 if (nxt_slow_path(fd == -1)) { 307 nxt_alert(task, "shm_open(SHM_ANON) failed %E", nxt_errno); 308 309 goto remove_fail; 310 } 311 312 #elif (NXT_HAVE_SHM_OPEN) 313 314 /* Just in case. */ 315 shm_unlink((char *) name); 316 317 fd = shm_open((char *) name, O_CREAT | O_EXCL | O_RDWR, S_IRUSR | S_IWUSR); 318 319 nxt_debug(task, "shm_open(%s): %FD", name, fd); 320 321 if (nxt_slow_path(fd == -1)) { 322 nxt_alert(task, "shm_open(%s) failed %E", name, nxt_errno); 323 324 goto remove_fail; 325 } 326 327 if (nxt_slow_path(shm_unlink((char *) name) == -1)) { 328 nxt_log(task, NXT_LOG_WARN, "shm_unlink(%s) failed %E", name, 329 nxt_errno); 330 } 331 332 #else 333 334 #error No working shared memory implementation. 335 336 #endif 337 338 if (nxt_slow_path(ftruncate(fd, PORT_MMAP_SIZE) == -1)) { 339 nxt_log(task, NXT_LOG_WARN, "ftruncate() failed %E", nxt_errno); 340 341 goto remove_fail; 342 } 343 344 mem = nxt_mem_mmap(NULL, PORT_MMAP_SIZE, PROT_READ | PROT_WRITE, 345 MAP_SHARED, fd, 0); 346 347 if (nxt_slow_path(mem == MAP_FAILED)) { 348 goto remove_fail; 349 } 350 351 mmap_handler->hdr = mem; 352 port_mmap->mmap_handler = mmap_handler; 353 nxt_port_mmap_handler_use(mmap_handler, 1); 354 355 /* Init segment header. */ 356 hdr = mmap_handler->hdr; 357 358 nxt_memset(hdr->free_map, 0xFFU, sizeof(hdr->free_map)); 359 nxt_memset(hdr->free_tracking_map, 0xFFU, sizeof(hdr->free_tracking_map)); 360 361 hdr->id = process->outgoing.size - 1; 362 hdr->src_pid = nxt_pid; 363 hdr->dst_pid = process->pid; 364 hdr->sent_over = port->id; 365 366 /* Mark first chunk as busy */ 367 free_map = tracking ? hdr->free_tracking_map : hdr->free_map; 368 369 nxt_port_mmap_set_chunk_busy(free_map, 0); 370 371 /* Mark as busy chunk followed the last available chunk. */ 372 nxt_port_mmap_set_chunk_busy(hdr->free_map, PORT_MMAP_CHUNK_COUNT); 373 nxt_port_mmap_set_chunk_busy(hdr->free_tracking_map, PORT_MMAP_CHUNK_COUNT); 374 375 nxt_debug(task, "send mmap fd %FD to process %PI", fd, port->pid); 376 377 /* TODO handle error */ 378 (void) nxt_port_socket_write(task, port, NXT_PORT_MSG_MMAP, fd, 0, 0, NULL); 379 380 nxt_log(task, NXT_LOG_DEBUG, "new mmap #%D created for %PI -> %PI", 381 hdr->id, nxt_pid, process->pid); 382 383 return mmap_handler; 384 385 remove_fail: 386 387 nxt_free(mmap_handler); 388 389 process->outgoing.size--; 390 391 return NULL; 392 } 393 394 395 static nxt_port_mmap_handler_t * 396 nxt_port_mmap_get(nxt_task_t *task, nxt_port_t *port, nxt_chunk_id_t *c, 397 nxt_bool_t tracking) 398 { 399 nxt_process_t *process; 400 nxt_free_map_t *free_map; 401 nxt_port_mmap_t *port_mmap; 402 nxt_port_mmap_t *end_port_mmap; 403 nxt_port_mmap_header_t *hdr; 404 nxt_port_mmap_handler_t *mmap_handler; 405 406 process = port->process; 407 if (nxt_slow_path(process == NULL)) { 408 return NULL; 409 } 410 411 *c = 0; 412 413 nxt_thread_mutex_lock(&process->outgoing.mutex); 414 415 end_port_mmap = process->outgoing.elts + process->outgoing.size; 416 417 for (port_mmap = process->outgoing.elts; 418 port_mmap < end_port_mmap; 419 port_mmap++) 420 { 421 mmap_handler = port_mmap->mmap_handler; 422 hdr = mmap_handler->hdr; 423 424 if (hdr->sent_over != 0xFFFFu && hdr->sent_over != port->id) { 425 continue; 426 } 427 428 free_map = tracking ? hdr->free_tracking_map : hdr->free_map; 429 430 if (nxt_port_mmap_get_free_chunk(free_map, c)) { 431 goto unlock_return; 432 } 433 } 434 435 /* TODO introduce port_mmap limit and release wait. */ 436 437 mmap_handler = nxt_port_new_port_mmap(task, process, port, tracking); 438 439 unlock_return: 440 441 nxt_thread_mutex_unlock(&process->outgoing.mutex); 442 443 return mmap_handler; 444 } 445 446 447 static nxt_port_mmap_handler_t * 448 nxt_port_get_port_incoming_mmap(nxt_task_t *task, nxt_pid_t spid, uint32_t id) 449 { 450 nxt_process_t *process; 451 nxt_port_mmap_handler_t *mmap_handler; 452 453 process = nxt_runtime_process_find(task->thread->runtime, spid); 454 if (nxt_slow_path(process == NULL)) { 455 return NULL; 456 } 457 458 nxt_thread_mutex_lock(&process->incoming.mutex); 459 460 if (nxt_fast_path(process->incoming.size > id)) { 461 mmap_handler = process->incoming.elts[id].mmap_handler; 462 463 } else { 464 mmap_handler = NULL; 465 466 nxt_debug(task, "invalid incoming mmap id %uD for pid %PI", id, spid); 467 } 468 469 nxt_thread_mutex_unlock(&process->incoming.mutex); 470 471 return mmap_handler; 472 } 473 474 475 nxt_int_t 476 nxt_port_mmap_get_tracking(nxt_task_t *task, nxt_port_t *port, 477 nxt_port_mmap_tracking_t *tracking, uint32_t stream) 478 { 479 nxt_chunk_id_t c; 480 nxt_port_mmap_header_t *hdr; 481 nxt_port_mmap_handler_t *mmap_handler; 482 483 nxt_debug(task, "request tracking for stream #%uD", stream); 484 485 mmap_handler = nxt_port_mmap_get(task, port, &c, 1); 486 if (nxt_slow_path(mmap_handler == NULL)) { 487 return NXT_ERROR; 488 } 489 490 nxt_port_mmap_handler_use(mmap_handler, 1); 491 492 hdr = mmap_handler->hdr; 493 494 tracking->mmap_handler = mmap_handler; 495 tracking->tracking = hdr->tracking + c; 496 497 *tracking->tracking = stream; 498 499 nxt_debug(task, "outgoing tracking allocation: %PI->%PI,%d,%d", 500 hdr->src_pid, hdr->dst_pid, hdr->id, c); 501 502 return NXT_OK; 503 } 504 505 506 nxt_bool_t 507 nxt_port_mmap_tracking_cancel(nxt_task_t *task, 508 nxt_port_mmap_tracking_t *tracking, uint32_t stream) 509 { 510 nxt_bool_t res; 511 nxt_chunk_id_t c; 512 nxt_port_mmap_header_t *hdr; 513 nxt_port_mmap_handler_t *mmap_handler; 514 515 mmap_handler = tracking->mmap_handler; 516 517 if (nxt_slow_path(mmap_handler == NULL)) { 518 return 0; 519 } 520 521 hdr = mmap_handler->hdr; 522 523 res = nxt_atomic_cmp_set(tracking->tracking, stream, 0); 524 525 nxt_debug(task, "%s tracking for stream #%uD", 526 (res ? "cancelled" : "failed to cancel"), stream); 527 528 if (!res) { 529 c = tracking->tracking - hdr->tracking; 530 nxt_port_mmap_set_chunk_free(hdr->free_tracking_map, c); 531 } 532 533 nxt_port_mmap_handler_use(mmap_handler, -1); 534 535 return res; 536 } 537 538 539 nxt_int_t 540 nxt_port_mmap_tracking_write(uint32_t *buf, nxt_port_mmap_tracking_t *t) 541 { 542 nxt_port_mmap_handler_t *mmap_handler; 543 544 mmap_handler = t->mmap_handler; 545 546 #if (NXT_DEBUG) 547 { 548 nxt_atomic_t *tracking; 549 550 tracking = mmap_handler->hdr->tracking; 551 552 nxt_assert(t->tracking >= tracking); 553 nxt_assert(t->tracking < tracking + PORT_MMAP_CHUNK_COUNT); 554 } 555 #endif 556 557 buf[0] = mmap_handler->hdr->id; 558 buf[1] = t->tracking - mmap_handler->hdr->tracking; 559 560 return NXT_OK; 561 } 562 563 nxt_bool_t 564 nxt_port_mmap_tracking_read(nxt_task_t *task, nxt_port_recv_msg_t *msg) 565 { 566 nxt_buf_t *b; 567 nxt_bool_t res; 568 nxt_chunk_id_t c; 569 nxt_port_mmap_header_t *hdr; 570 nxt_port_mmap_handler_t *mmap_handler; 571 nxt_port_mmap_tracking_msg_t *tracking_msg; 572 573 b = msg->buf; 574 575 if (nxt_buf_used_size(b) < (int) sizeof(nxt_port_mmap_tracking_msg_t)) { 576 nxt_debug(task, "too small message %O", nxt_buf_used_size(b)); 577 return 0; 578 } 579 580 tracking_msg = (nxt_port_mmap_tracking_msg_t *) b->mem.pos; 581 582 b->mem.pos += sizeof(nxt_port_mmap_tracking_msg_t); 583 mmap_handler = nxt_port_get_port_incoming_mmap(task, msg->port_msg.pid, 584 tracking_msg->mmap_id); 585 586 if (nxt_slow_path(mmap_handler == NULL)) { 587 return 0; 588 } 589 590 hdr = mmap_handler->hdr; 591 592 c = tracking_msg->tracking_id; 593 res = nxt_atomic_cmp_set(hdr->tracking + c, msg->port_msg.stream, 0); 594 595 nxt_debug(task, "tracking for stream #%uD %s", msg->port_msg.stream, 596 (res ? "received" : "already cancelled")); 597 598 if (!res) { 599 nxt_port_mmap_set_chunk_free(hdr->free_tracking_map, c); 600 } 601 602 return res; 603 } 604 605 606 nxt_buf_t * 607 nxt_port_mmap_get_buf(nxt_task_t *task, nxt_port_t *port, size_t size) 608 { 609 size_t nchunks; 610 nxt_mp_t *mp; 611 nxt_buf_t *b; 612 nxt_chunk_id_t c; 613 nxt_port_mmap_header_t *hdr; 614 nxt_port_mmap_handler_t *mmap_handler; 615 616 nxt_debug(task, "request %z bytes shm buffer", size); 617 618 b = nxt_buf_mem_ts_alloc(task, task->thread->engine->mem_pool, 0); 619 if (nxt_slow_path(b == NULL)) { 620 return NULL; 621 } 622 623 b->completion_handler = nxt_port_mmap_buf_completion; 624 nxt_buf_set_port_mmap(b); 625 626 mmap_handler = nxt_port_mmap_get(task, port, &c, 0); 627 if (nxt_slow_path(mmap_handler == NULL)) { 628 mp = task->thread->engine->mem_pool; 629 nxt_mp_free(mp, b); 630 nxt_mp_release(mp); 631 return NULL; 632 } 633 634 b->parent = mmap_handler; 635 636 nxt_port_mmap_handler_use(mmap_handler, 1); 637 638 hdr = mmap_handler->hdr; 639 640 b->mem.start = nxt_port_mmap_chunk_start(hdr, c); 641 b->mem.pos = b->mem.start; 642 b->mem.free = b->mem.start; 643 b->mem.end = b->mem.start + PORT_MMAP_CHUNK_SIZE; 644 645 nchunks = size / PORT_MMAP_CHUNK_SIZE; 646 if ((size % PORT_MMAP_CHUNK_SIZE) != 0 || nchunks == 0) { 647 nchunks++; 648 } 649 650 nxt_debug(task, "outgoing mmap buf allocation: %p [%p,%uz] %PI->%PI,%d,%d", 651 b, b->mem.start, b->mem.end - b->mem.start, 652 hdr->src_pid, hdr->dst_pid, hdr->id, c); 653 654 c++; 655 nchunks--; 656 657 /* Try to acquire as much chunks as required. */ 658 while (nchunks > 0) { 659 660 if (nxt_port_mmap_chk_set_chunk_busy(hdr->free_map, c) == 0) { 661 break; 662 } 663 664 b->mem.end += PORT_MMAP_CHUNK_SIZE; 665 c++; 666 nchunks--; 667 } 668 669 return b; 670 } 671 672 673 nxt_int_t 674 nxt_port_mmap_increase_buf(nxt_task_t *task, nxt_buf_t *b, size_t size, 675 size_t min_size) 676 { 677 size_t nchunks, free_size; 678 nxt_chunk_id_t c, start; 679 nxt_port_mmap_header_t *hdr; 680 nxt_port_mmap_handler_t *mmap_handler; 681 682 nxt_debug(task, "request increase %z bytes shm buffer", size); 683 684 if (nxt_slow_path(nxt_buf_is_port_mmap(b) == 0)) { 685 nxt_log(task, NXT_LOG_WARN, 686 "failed to increase, not a mmap buffer"); 687 return NXT_ERROR; 688 } 689 690 free_size = nxt_buf_mem_free_size(&b->mem); 691 692 if (nxt_slow_path(size <= free_size)) { 693 return NXT_OK; 694 } 695 696 mmap_handler = b->parent; 697 hdr = mmap_handler->hdr; 698 699 start = nxt_port_mmap_chunk_id(hdr, b->mem.end); 700 701 size -= free_size; 702 703 nchunks = size / PORT_MMAP_CHUNK_SIZE; 704 if ((size % PORT_MMAP_CHUNK_SIZE) != 0 || nchunks == 0) { 705 nchunks++; 706 } 707 708 c = start; 709 710 /* Try to acquire as much chunks as required. */ 711 while (nchunks > 0) { 712 713 if (nxt_port_mmap_chk_set_chunk_busy(hdr->free_map, c) == 0) { 714 break; 715 } 716 717 c++; 718 nchunks--; 719 } 720 721 if (nchunks != 0 722 && min_size > free_size + PORT_MMAP_CHUNK_SIZE * (c - start)) 723 { 724 c--; 725 while (c >= start) { 726 nxt_port_mmap_set_chunk_free(hdr->free_map, c); 727 c--; 728 } 729 730 nxt_debug(task, "failed to increase, %uz chunks busy", nchunks); 731 732 return NXT_ERROR; 733 734 } else { 735 b->mem.end += PORT_MMAP_CHUNK_SIZE * (c - start); 736 737 return NXT_OK; 738 } 739 } 740 741 742 static nxt_buf_t * 743 nxt_port_mmap_get_incoming_buf(nxt_task_t *task, nxt_port_t *port, 744 nxt_pid_t spid, nxt_port_mmap_msg_t *mmap_msg) 745 { 746 size_t nchunks; 747 nxt_buf_t *b; 748 nxt_port_mmap_header_t *hdr; 749 nxt_port_mmap_handler_t *mmap_handler; 750 751 mmap_handler = nxt_port_get_port_incoming_mmap(task, spid, 752 mmap_msg->mmap_id); 753 if (nxt_slow_path(mmap_handler == NULL)) { 754 return NULL; 755 } 756 757 b = nxt_buf_mem_ts_alloc(task, port->mem_pool, 0); 758 if (nxt_slow_path(b == NULL)) { 759 return NULL; 760 } 761 762 b->completion_handler = nxt_port_mmap_buf_completion; 763 764 nxt_buf_set_port_mmap(b); 765 766 nchunks = mmap_msg->size / PORT_MMAP_CHUNK_SIZE; 767 if ((mmap_msg->size % PORT_MMAP_CHUNK_SIZE) != 0) { 768 nchunks++; 769 } 770 771 hdr = mmap_handler->hdr; 772 773 b->mem.start = nxt_port_mmap_chunk_start(hdr, mmap_msg->chunk_id); 774 b->mem.pos = b->mem.start; 775 b->mem.free = b->mem.start + mmap_msg->size; 776 b->mem.end = b->mem.start + nchunks * PORT_MMAP_CHUNK_SIZE; 777 778 b->parent = mmap_handler; 779 nxt_port_mmap_handler_use(mmap_handler, 1); 780 781 nxt_debug(task, "incoming mmap buf allocation: %p [%p,%uz] %PI->%PI,%d,%d", 782 b, b->mem.start, b->mem.end - b->mem.start, 783 hdr->src_pid, hdr->dst_pid, hdr->id, mmap_msg->chunk_id); 784 785 return b; 786 } 787 788 789 void 790 nxt_port_mmap_write(nxt_task_t *task, nxt_port_t *port, 791 nxt_port_send_msg_t *msg, nxt_sendbuf_coalesce_t *sb) 792 { 793 size_t bsize; 794 nxt_buf_t *bmem; 795 nxt_uint_t i; 796 nxt_port_mmap_msg_t *mmap_msg; 797 nxt_port_mmap_header_t *hdr; 798 nxt_port_mmap_handler_t *mmap_handler; 799 800 nxt_debug(task, "prepare %z bytes message for transfer to process %PI " 801 "via shared memory", sb->size, port->pid); 802 803 bsize = sb->niov * sizeof(nxt_port_mmap_msg_t); 804 mmap_msg = port->mmsg_buf; 805 806 bmem = msg->buf; 807 808 for (i = 0; i < sb->niov; i++, mmap_msg++) { 809 810 /* Lookup buffer which starts current iov_base. */ 811 while (bmem && sb->iobuf[i].iov_base != bmem->mem.pos) { 812 bmem = bmem->next; 813 } 814 815 if (nxt_slow_path(bmem == NULL)) { 816 nxt_log_error(NXT_LOG_ERR, task->log, 817 "failed to find buf for iobuf[%d]", i); 818 return; 819 /* TODO clear b and exit */ 820 } 821 822 mmap_handler = bmem->parent; 823 hdr = mmap_handler->hdr; 824 825 mmap_msg->mmap_id = hdr->id; 826 mmap_msg->chunk_id = nxt_port_mmap_chunk_id(hdr, bmem->mem.pos); 827 mmap_msg->size = sb->iobuf[i].iov_len; 828 829 nxt_debug(task, "mmap_msg={%D, %D, %D} to %PI", 830 mmap_msg->mmap_id, mmap_msg->chunk_id, mmap_msg->size, 831 port->pid); 832 } 833 834 sb->iobuf[0].iov_base = port->mmsg_buf; 835 sb->iobuf[0].iov_len = bsize; 836 sb->niov = 1; 837 sb->size = bsize; 838 839 msg->port_msg.mmap = 1; 840 } 841 842 843 void 844 nxt_port_mmap_read(nxt_task_t *task, nxt_port_recv_msg_t *msg) 845 { 846 nxt_buf_t *b, **pb; 847 nxt_port_mmap_msg_t *end, *mmap_msg; 848 849 pb = &msg->buf; 850 msg->size = 0; 851 852 for (b = msg->buf; b != NULL; b = b->next) { 853 854 mmap_msg = (nxt_port_mmap_msg_t *) b->mem.pos; 855 end = (nxt_port_mmap_msg_t *) b->mem.free; 856 857 while (mmap_msg < end) { 858 nxt_debug(task, "mmap_msg={%D, %D, %D} from %PI", 859 mmap_msg->mmap_id, mmap_msg->chunk_id, mmap_msg->size, 860 msg->port_msg.pid); 861 862 *pb = nxt_port_mmap_get_incoming_buf(task, msg->port, 863 msg->port_msg.pid, mmap_msg); 864 if (nxt_slow_path(*pb == NULL)) { 865 nxt_log_error(NXT_LOG_ERR, task->log, 866 "failed to get mmap buffer"); 867 868 break; 869 } 870 871 msg->size += mmap_msg->size; 872 pb = &(*pb)->next; 873 mmap_msg++; 874 875 /* Mark original buf as complete. */ 876 b->mem.pos += sizeof(nxt_port_mmap_msg_t); 877 } 878 } 879 } 880 881 882 nxt_port_method_t 883 nxt_port_mmap_get_method(nxt_task_t *task, nxt_port_t *port, nxt_buf_t *b) 884 { 885 nxt_port_method_t m; 886 nxt_port_mmap_header_t *hdr; 887 nxt_port_mmap_handler_t *mmap_handler; 888 889 m = NXT_PORT_METHOD_ANY; 890 891 for (; b != NULL; b = b->next) { 892 if (nxt_buf_used_size(b) == 0) { 893 /* empty buffers does not affect method */ 894 continue; 895 } 896 897 if (nxt_buf_is_port_mmap(b)) { 898 mmap_handler = b->parent; 899 hdr = mmap_handler->hdr; 900 901 if (m == NXT_PORT_METHOD_PLAIN) { 902 nxt_log_error(NXT_LOG_ERR, task->log, 903 "mixing plain and mmap buffers, " 904 "using plain mode"); 905 906 break; 907 } 908 909 if (port->pid != hdr->dst_pid) { 910 nxt_log_error(NXT_LOG_ERR, task->log, 911 "send mmap buffer for %PI to %PI, " 912 "using plain mode", hdr->dst_pid, port->pid); 913 914 m = NXT_PORT_METHOD_PLAIN; 915 916 break; 917 } 918 919 if (m == NXT_PORT_METHOD_ANY) { 920 nxt_debug(task, "using mmap mode"); 921 922 m = NXT_PORT_METHOD_MMAP; 923 } 924 } else { 925 if (m == NXT_PORT_METHOD_MMAP) { 926 nxt_log_error(NXT_LOG_ERR, task->log, 927 "mixing mmap and plain buffers, " 928 "switching to plain mode"); 929 930 m = NXT_PORT_METHOD_PLAIN; 931 932 break; 933 } 934 935 if (m == NXT_PORT_METHOD_ANY) { 936 nxt_debug(task, "using plain mode"); 937 938 m = NXT_PORT_METHOD_PLAIN; 939 } 940 } 941 } 942 943 return m; 944 } 945