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, *next; 115 nxt_port_t *port; 116 nxt_process_t *process; 117 nxt_chunk_id_t c; 118 nxt_port_mmap_header_t *hdr; 119 nxt_port_mmap_handler_t *mmap_handler; 120 121 if (nxt_buf_ts_handle(task, obj, data)) { 122 return; 123 } 124 125 b = obj; 126 127 nxt_assert(data == b->parent); 128 129 mmap_handler = data; 130 131 complete_buf: 132 133 hdr = mmap_handler->hdr; 134 135 if (nxt_slow_path(hdr->src_pid != nxt_pid && hdr->dst_pid != nxt_pid)) { 136 nxt_debug(task, "mmap buf completion: mmap for other process pair " 137 "%PI->%PI", hdr->src_pid, hdr->dst_pid); 138 139 goto release_buf; 140 } 141 142 if (b->is_port_mmap_sent && b->mem.pos > b->mem.start) { 143 /* 144 * Chunks until b->mem.pos has been sent to other side, 145 * let's release rest (if any). 146 */ 147 p = b->mem.pos - 1; 148 c = nxt_port_mmap_chunk_id(hdr, p) + 1; 149 p = nxt_port_mmap_chunk_start(hdr, c); 150 151 } else { 152 p = b->mem.start; 153 c = nxt_port_mmap_chunk_id(hdr, p); 154 } 155 156 nxt_port_mmap_free_junk(p, b->mem.end - p); 157 158 nxt_debug(task, "mmap buf completion: %p [%p,%uz] (sent=%d), " 159 "%PI->%PI,%d,%d", b, b->mem.start, b->mem.end - b->mem.start, 160 b->is_port_mmap_sent, hdr->src_pid, hdr->dst_pid, hdr->id, c); 161 162 while (p < b->mem.end) { 163 nxt_port_mmap_set_chunk_free(hdr->free_map, c); 164 165 p += PORT_MMAP_CHUNK_SIZE; 166 c++; 167 } 168 169 if (hdr->dst_pid == nxt_pid 170 && nxt_atomic_cmp_set(&hdr->oosm, 1, 0)) 171 { 172 process = nxt_runtime_process_find(task->thread->runtime, hdr->src_pid); 173 174 if (process != NULL && !nxt_queue_is_empty(&process->ports)) { 175 port = nxt_process_port_first(process); 176 177 if (port->type == NXT_PROCESS_APP) { 178 (void) nxt_port_socket_write(task, port, NXT_PORT_MSG_SHM_ACK, 179 -1, 0, 0, NULL); 180 } 181 } 182 } 183 184 release_buf: 185 186 nxt_port_mmap_handler_use(mmap_handler, -1); 187 188 next = b->next; 189 mp = b->data; 190 191 nxt_mp_free(mp, b); 192 nxt_mp_release(mp); 193 194 if (next != NULL) { 195 b = next; 196 mmap_handler = b->parent; 197 198 goto complete_buf; 199 } 200 } 201 202 203 nxt_port_mmap_handler_t * 204 nxt_port_incoming_port_mmap(nxt_task_t *task, nxt_process_t *process, 205 nxt_fd_t fd) 206 { 207 void *mem; 208 struct stat mmap_stat; 209 nxt_port_mmap_t *port_mmap; 210 nxt_port_mmap_header_t *hdr; 211 nxt_port_mmap_handler_t *mmap_handler; 212 213 nxt_debug(task, "got new mmap fd #%FD from process %PI", 214 fd, process->pid); 215 216 port_mmap = NULL; 217 218 if (fstat(fd, &mmap_stat) == -1) { 219 nxt_log(task, NXT_LOG_WARN, "fstat(%FD) failed %E", fd, nxt_errno); 220 221 return NULL; 222 } 223 224 mem = nxt_mem_mmap(NULL, mmap_stat.st_size, 225 PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0); 226 227 if (nxt_slow_path(mem == MAP_FAILED)) { 228 nxt_log(task, NXT_LOG_WARN, "mmap() failed %E", nxt_errno); 229 230 return NULL; 231 } 232 233 hdr = mem; 234 235 mmap_handler = nxt_zalloc(sizeof(nxt_port_mmap_handler_t)); 236 if (nxt_slow_path(mmap_handler == NULL)) { 237 nxt_log(task, NXT_LOG_WARN, "failed to allocate mmap_handler"); 238 239 nxt_mem_munmap(mem, PORT_MMAP_SIZE); 240 241 return NULL; 242 } 243 244 mmap_handler->hdr = hdr; 245 246 if (nxt_slow_path(hdr->src_pid != process->pid 247 || hdr->dst_pid != nxt_pid)) 248 { 249 nxt_log(task, NXT_LOG_WARN, "unexpected pid in mmap header detected: " 250 "%PI != %PI or %PI != %PI", hdr->src_pid, process->pid, 251 hdr->dst_pid, nxt_pid); 252 253 return NULL; 254 } 255 256 nxt_thread_mutex_lock(&process->incoming.mutex); 257 258 port_mmap = nxt_port_mmap_at(&process->incoming, hdr->id); 259 if (nxt_slow_path(port_mmap == NULL)) { 260 nxt_log(task, NXT_LOG_WARN, "failed to add mmap to incoming array"); 261 262 nxt_mem_munmap(mem, PORT_MMAP_SIZE); 263 hdr = NULL; 264 265 nxt_free(mmap_handler); 266 mmap_handler = NULL; 267 268 goto fail; 269 } 270 271 port_mmap->mmap_handler = mmap_handler; 272 nxt_port_mmap_handler_use(mmap_handler, 1); 273 274 hdr->sent_over = 0xFFFFu; 275 276 fail: 277 278 nxt_thread_mutex_unlock(&process->incoming.mutex); 279 280 return mmap_handler; 281 } 282 283 284 static nxt_port_mmap_handler_t * 285 nxt_port_new_port_mmap(nxt_task_t *task, nxt_process_t *process, 286 nxt_port_t *port, nxt_bool_t tracking, nxt_int_t n) 287 { 288 void *mem; 289 u_char *p, name[64]; 290 nxt_fd_t fd; 291 nxt_int_t i; 292 nxt_free_map_t *free_map; 293 nxt_port_mmap_t *port_mmap; 294 nxt_port_mmap_header_t *hdr; 295 nxt_port_mmap_handler_t *mmap_handler; 296 297 mmap_handler = nxt_zalloc(sizeof(nxt_port_mmap_handler_t)); 298 if (nxt_slow_path(mmap_handler == NULL)) { 299 nxt_log(task, NXT_LOG_WARN, "failed to allocate mmap_handler"); 300 301 return NULL; 302 } 303 304 port_mmap = nxt_port_mmap_at(&process->outgoing, process->outgoing.size); 305 if (nxt_slow_path(port_mmap == NULL)) { 306 nxt_log(task, NXT_LOG_WARN, 307 "failed to add port mmap to outgoing array"); 308 309 nxt_free(mmap_handler); 310 return NULL; 311 } 312 313 p = nxt_sprintf(name, name + sizeof(name), NXT_SHM_PREFIX "unit.%PI.%uxD", 314 nxt_pid, nxt_random(&task->thread->random)); 315 *p = '\0'; 316 317 #if (NXT_HAVE_MEMFD_CREATE) 318 319 fd = syscall(SYS_memfd_create, name, MFD_CLOEXEC); 320 321 if (nxt_slow_path(fd == -1)) { 322 nxt_alert(task, "memfd_create(%s) failed %E", name, nxt_errno); 323 324 goto remove_fail; 325 } 326 327 nxt_debug(task, "memfd_create(%s): %FD", name, fd); 328 329 #elif (NXT_HAVE_SHM_OPEN_ANON) 330 331 fd = shm_open(SHM_ANON, O_RDWR, S_IRUSR | S_IWUSR); 332 333 nxt_debug(task, "shm_open(SHM_ANON): %FD", fd); 334 335 if (nxt_slow_path(fd == -1)) { 336 nxt_alert(task, "shm_open(SHM_ANON) failed %E", nxt_errno); 337 338 goto remove_fail; 339 } 340 341 #elif (NXT_HAVE_SHM_OPEN) 342 343 /* Just in case. */ 344 shm_unlink((char *) name); 345 346 fd = shm_open((char *) name, O_CREAT | O_EXCL | O_RDWR, S_IRUSR | S_IWUSR); 347 348 nxt_debug(task, "shm_open(%s): %FD", name, fd); 349 350 if (nxt_slow_path(fd == -1)) { 351 nxt_alert(task, "shm_open(%s) failed %E", name, nxt_errno); 352 353 goto remove_fail; 354 } 355 356 if (nxt_slow_path(shm_unlink((char *) name) == -1)) { 357 nxt_log(task, NXT_LOG_WARN, "shm_unlink(%s) failed %E", name, 358 nxt_errno); 359 } 360 361 #else 362 363 #error No working shared memory implementation. 364 365 #endif 366 367 if (nxt_slow_path(ftruncate(fd, PORT_MMAP_SIZE) == -1)) { 368 nxt_log(task, NXT_LOG_WARN, "ftruncate() failed %E", nxt_errno); 369 370 goto remove_fail; 371 } 372 373 mem = nxt_mem_mmap(NULL, PORT_MMAP_SIZE, PROT_READ | PROT_WRITE, 374 MAP_SHARED, fd, 0); 375 376 if (nxt_slow_path(mem == MAP_FAILED)) { 377 goto remove_fail; 378 } 379 380 mmap_handler->hdr = mem; 381 port_mmap->mmap_handler = mmap_handler; 382 nxt_port_mmap_handler_use(mmap_handler, 1); 383 384 /* Init segment header. */ 385 hdr = mmap_handler->hdr; 386 387 nxt_memset(hdr->free_map, 0xFFU, sizeof(hdr->free_map)); 388 nxt_memset(hdr->free_tracking_map, 0xFFU, sizeof(hdr->free_tracking_map)); 389 390 hdr->id = process->outgoing.size - 1; 391 hdr->src_pid = nxt_pid; 392 hdr->dst_pid = process->pid; 393 hdr->sent_over = port->id; 394 395 /* Mark first chunk as busy */ 396 free_map = tracking ? hdr->free_tracking_map : hdr->free_map; 397 398 for (i = 0; i < n; i++) { 399 nxt_port_mmap_set_chunk_busy(free_map, i); 400 } 401 402 /* Mark as busy chunk followed the last available chunk. */ 403 nxt_port_mmap_set_chunk_busy(hdr->free_map, PORT_MMAP_CHUNK_COUNT); 404 nxt_port_mmap_set_chunk_busy(hdr->free_tracking_map, PORT_MMAP_CHUNK_COUNT); 405 406 nxt_debug(task, "send mmap fd %FD to process %PI", fd, port->pid); 407 408 /* TODO handle error */ 409 (void) nxt_port_socket_write(task, port, NXT_PORT_MSG_MMAP, fd, 0, 0, NULL); 410 411 nxt_log(task, NXT_LOG_DEBUG, "new mmap #%D created for %PI -> %PI", 412 hdr->id, nxt_pid, process->pid); 413 414 return mmap_handler; 415 416 remove_fail: 417 418 nxt_free(mmap_handler); 419 420 process->outgoing.size--; 421 422 return NULL; 423 } 424 425 426 static nxt_port_mmap_handler_t * 427 nxt_port_mmap_get(nxt_task_t *task, nxt_port_t *port, nxt_chunk_id_t *c, 428 nxt_int_t n, nxt_bool_t tracking) 429 { 430 nxt_int_t i, res, nchunks; 431 nxt_process_t *process; 432 nxt_free_map_t *free_map; 433 nxt_port_mmap_t *port_mmap; 434 nxt_port_mmap_t *end_port_mmap; 435 nxt_port_mmap_header_t *hdr; 436 nxt_port_mmap_handler_t *mmap_handler; 437 438 process = port->process; 439 if (nxt_slow_path(process == NULL)) { 440 return NULL; 441 } 442 443 nxt_thread_mutex_lock(&process->outgoing.mutex); 444 445 end_port_mmap = process->outgoing.elts + process->outgoing.size; 446 447 for (port_mmap = process->outgoing.elts; 448 port_mmap < end_port_mmap; 449 port_mmap++) 450 { 451 mmap_handler = port_mmap->mmap_handler; 452 hdr = mmap_handler->hdr; 453 454 if (hdr->sent_over != 0xFFFFu && hdr->sent_over != port->id) { 455 continue; 456 } 457 458 *c = 0; 459 460 free_map = tracking ? hdr->free_tracking_map : hdr->free_map; 461 462 while (nxt_port_mmap_get_free_chunk(free_map, c)) { 463 nchunks = 1; 464 465 while (nchunks < n) { 466 res = nxt_port_mmap_chk_set_chunk_busy(free_map, *c + nchunks); 467 468 if (res == 0) { 469 for (i = 0; i < nchunks; i++) { 470 nxt_port_mmap_set_chunk_free(free_map, *c + i); 471 } 472 473 *c += nchunks + 1; 474 nchunks = 0; 475 break; 476 } 477 478 nchunks++; 479 } 480 481 if (nchunks == n) { 482 goto unlock_return; 483 } 484 } 485 486 hdr->oosm = 1; 487 } 488 489 /* TODO introduce port_mmap limit and release wait. */ 490 491 *c = 0; 492 mmap_handler = nxt_port_new_port_mmap(task, process, port, tracking, n); 493 494 unlock_return: 495 496 nxt_thread_mutex_unlock(&process->outgoing.mutex); 497 498 return mmap_handler; 499 } 500 501 502 static nxt_port_mmap_handler_t * 503 nxt_port_get_port_incoming_mmap(nxt_task_t *task, nxt_pid_t spid, uint32_t id) 504 { 505 nxt_process_t *process; 506 nxt_port_mmap_handler_t *mmap_handler; 507 508 process = nxt_runtime_process_find(task->thread->runtime, spid); 509 if (nxt_slow_path(process == NULL)) { 510 return NULL; 511 } 512 513 nxt_thread_mutex_lock(&process->incoming.mutex); 514 515 if (nxt_fast_path(process->incoming.size > id)) { 516 mmap_handler = process->incoming.elts[id].mmap_handler; 517 518 } else { 519 mmap_handler = NULL; 520 521 nxt_debug(task, "invalid incoming mmap id %uD for pid %PI", id, spid); 522 } 523 524 nxt_thread_mutex_unlock(&process->incoming.mutex); 525 526 return mmap_handler; 527 } 528 529 530 nxt_int_t 531 nxt_port_mmap_get_tracking(nxt_task_t *task, nxt_port_t *port, 532 nxt_port_mmap_tracking_t *tracking, uint32_t stream) 533 { 534 nxt_chunk_id_t c; 535 nxt_port_mmap_header_t *hdr; 536 nxt_port_mmap_handler_t *mmap_handler; 537 538 nxt_debug(task, "request tracking for stream #%uD", stream); 539 540 mmap_handler = nxt_port_mmap_get(task, port, &c, 1, 1); 541 if (nxt_slow_path(mmap_handler == NULL)) { 542 return NXT_ERROR; 543 } 544 545 nxt_port_mmap_handler_use(mmap_handler, 1); 546 547 hdr = mmap_handler->hdr; 548 549 tracking->mmap_handler = mmap_handler; 550 tracking->tracking = hdr->tracking + c; 551 552 *tracking->tracking = stream; 553 554 nxt_debug(task, "outgoing tracking allocation: %PI->%PI,%d,%d", 555 hdr->src_pid, hdr->dst_pid, hdr->id, c); 556 557 return NXT_OK; 558 } 559 560 561 nxt_bool_t 562 nxt_port_mmap_tracking_cancel(nxt_task_t *task, 563 nxt_port_mmap_tracking_t *tracking, uint32_t stream) 564 { 565 nxt_bool_t res; 566 nxt_chunk_id_t c; 567 nxt_port_mmap_header_t *hdr; 568 nxt_port_mmap_handler_t *mmap_handler; 569 570 mmap_handler = tracking->mmap_handler; 571 572 if (nxt_slow_path(mmap_handler == NULL)) { 573 return 0; 574 } 575 576 hdr = mmap_handler->hdr; 577 578 res = nxt_atomic_cmp_set(tracking->tracking, stream, 0); 579 580 nxt_debug(task, "%s tracking for stream #%uD", 581 (res ? "cancelled" : "failed to cancel"), stream); 582 583 if (!res) { 584 c = tracking->tracking - hdr->tracking; 585 nxt_port_mmap_set_chunk_free(hdr->free_tracking_map, c); 586 } 587 588 nxt_port_mmap_handler_use(mmap_handler, -1); 589 590 return res; 591 } 592 593 594 nxt_int_t 595 nxt_port_mmap_tracking_write(uint32_t *buf, nxt_port_mmap_tracking_t *t) 596 { 597 nxt_port_mmap_handler_t *mmap_handler; 598 599 mmap_handler = t->mmap_handler; 600 601 #if (NXT_DEBUG) 602 { 603 nxt_atomic_t *tracking; 604 605 tracking = mmap_handler->hdr->tracking; 606 607 nxt_assert(t->tracking >= tracking); 608 nxt_assert(t->tracking < tracking + PORT_MMAP_CHUNK_COUNT); 609 } 610 #endif 611 612 buf[0] = mmap_handler->hdr->id; 613 buf[1] = t->tracking - mmap_handler->hdr->tracking; 614 615 return NXT_OK; 616 } 617 618 nxt_bool_t 619 nxt_port_mmap_tracking_read(nxt_task_t *task, nxt_port_recv_msg_t *msg) 620 { 621 nxt_buf_t *b; 622 nxt_bool_t res; 623 nxt_chunk_id_t c; 624 nxt_port_mmap_header_t *hdr; 625 nxt_port_mmap_handler_t *mmap_handler; 626 nxt_port_mmap_tracking_msg_t *tracking_msg; 627 628 b = msg->buf; 629 630 if (nxt_buf_used_size(b) < (int) sizeof(nxt_port_mmap_tracking_msg_t)) { 631 nxt_debug(task, "too small message %O", nxt_buf_used_size(b)); 632 return 0; 633 } 634 635 tracking_msg = (nxt_port_mmap_tracking_msg_t *) b->mem.pos; 636 637 b->mem.pos += sizeof(nxt_port_mmap_tracking_msg_t); 638 mmap_handler = nxt_port_get_port_incoming_mmap(task, msg->port_msg.pid, 639 tracking_msg->mmap_id); 640 641 if (nxt_slow_path(mmap_handler == NULL)) { 642 return 0; 643 } 644 645 hdr = mmap_handler->hdr; 646 647 c = tracking_msg->tracking_id; 648 res = nxt_atomic_cmp_set(hdr->tracking + c, msg->port_msg.stream, 0); 649 650 nxt_debug(task, "tracking for stream #%uD %s", msg->port_msg.stream, 651 (res ? "received" : "already cancelled")); 652 653 if (!res) { 654 nxt_port_mmap_set_chunk_free(hdr->free_tracking_map, c); 655 } 656 657 return res; 658 } 659 660 661 nxt_buf_t * 662 nxt_port_mmap_get_buf(nxt_task_t *task, nxt_port_t *port, size_t size) 663 { 664 nxt_mp_t *mp; 665 nxt_buf_t *b; 666 nxt_int_t nchunks; 667 nxt_chunk_id_t c; 668 nxt_port_mmap_header_t *hdr; 669 nxt_port_mmap_handler_t *mmap_handler; 670 671 nxt_debug(task, "request %z bytes shm buffer", size); 672 673 nchunks = (size + PORT_MMAP_CHUNK_SIZE - 1) / PORT_MMAP_CHUNK_SIZE; 674 675 if (nxt_slow_path(nchunks > PORT_MMAP_CHUNK_COUNT)) { 676 nxt_alert(task, "requested buffer (%z) too big", size); 677 678 return NULL; 679 } 680 681 b = nxt_buf_mem_ts_alloc(task, task->thread->engine->mem_pool, 0); 682 if (nxt_slow_path(b == NULL)) { 683 return NULL; 684 } 685 686 b->completion_handler = nxt_port_mmap_buf_completion; 687 nxt_buf_set_port_mmap(b); 688 689 mmap_handler = nxt_port_mmap_get(task, port, &c, nchunks, 0); 690 if (nxt_slow_path(mmap_handler == NULL)) { 691 mp = task->thread->engine->mem_pool; 692 nxt_mp_free(mp, b); 693 nxt_mp_release(mp); 694 return NULL; 695 } 696 697 b->parent = mmap_handler; 698 699 nxt_port_mmap_handler_use(mmap_handler, 1); 700 701 hdr = mmap_handler->hdr; 702 703 b->mem.start = nxt_port_mmap_chunk_start(hdr, c); 704 b->mem.pos = b->mem.start; 705 b->mem.free = b->mem.start; 706 b->mem.end = b->mem.start + nchunks * PORT_MMAP_CHUNK_SIZE; 707 708 nxt_debug(task, "outgoing mmap buf allocation: %p [%p,%uz] %PI->%PI,%d,%d", 709 b, b->mem.start, b->mem.end - b->mem.start, 710 hdr->src_pid, hdr->dst_pid, hdr->id, c); 711 712 return b; 713 } 714 715 716 nxt_int_t 717 nxt_port_mmap_increase_buf(nxt_task_t *task, nxt_buf_t *b, size_t size, 718 size_t min_size) 719 { 720 size_t nchunks, free_size; 721 nxt_chunk_id_t c, start; 722 nxt_port_mmap_header_t *hdr; 723 nxt_port_mmap_handler_t *mmap_handler; 724 725 nxt_debug(task, "request increase %z bytes shm buffer", size); 726 727 if (nxt_slow_path(nxt_buf_is_port_mmap(b) == 0)) { 728 nxt_log(task, NXT_LOG_WARN, 729 "failed to increase, not a mmap buffer"); 730 return NXT_ERROR; 731 } 732 733 free_size = nxt_buf_mem_free_size(&b->mem); 734 735 if (nxt_slow_path(size <= free_size)) { 736 return NXT_OK; 737 } 738 739 mmap_handler = b->parent; 740 hdr = mmap_handler->hdr; 741 742 start = nxt_port_mmap_chunk_id(hdr, b->mem.end); 743 744 size -= free_size; 745 746 nchunks = (size + PORT_MMAP_CHUNK_SIZE - 1) / PORT_MMAP_CHUNK_SIZE; 747 748 c = start; 749 750 /* Try to acquire as much chunks as required. */ 751 while (nchunks > 0) { 752 753 if (nxt_port_mmap_chk_set_chunk_busy(hdr->free_map, c) == 0) { 754 break; 755 } 756 757 c++; 758 nchunks--; 759 } 760 761 if (nchunks != 0 762 && min_size > free_size + PORT_MMAP_CHUNK_SIZE * (c - start)) 763 { 764 c--; 765 while (c >= start) { 766 nxt_port_mmap_set_chunk_free(hdr->free_map, c); 767 c--; 768 } 769 770 nxt_debug(task, "failed to increase, %uz chunks busy", nchunks); 771 772 return NXT_ERROR; 773 774 } else { 775 b->mem.end += PORT_MMAP_CHUNK_SIZE * (c - start); 776 777 return NXT_OK; 778 } 779 } 780 781 782 static nxt_buf_t * 783 nxt_port_mmap_get_incoming_buf(nxt_task_t *task, nxt_port_t *port, 784 nxt_pid_t spid, nxt_port_mmap_msg_t *mmap_msg) 785 { 786 size_t nchunks; 787 nxt_buf_t *b; 788 nxt_port_mmap_header_t *hdr; 789 nxt_port_mmap_handler_t *mmap_handler; 790 791 mmap_handler = nxt_port_get_port_incoming_mmap(task, spid, 792 mmap_msg->mmap_id); 793 if (nxt_slow_path(mmap_handler == NULL)) { 794 return NULL; 795 } 796 797 b = nxt_buf_mem_ts_alloc(task, port->mem_pool, 0); 798 if (nxt_slow_path(b == NULL)) { 799 return NULL; 800 } 801 802 b->completion_handler = nxt_port_mmap_buf_completion; 803 804 nxt_buf_set_port_mmap(b); 805 806 nchunks = mmap_msg->size / PORT_MMAP_CHUNK_SIZE; 807 if ((mmap_msg->size % PORT_MMAP_CHUNK_SIZE) != 0) { 808 nchunks++; 809 } 810 811 hdr = mmap_handler->hdr; 812 813 b->mem.start = nxt_port_mmap_chunk_start(hdr, mmap_msg->chunk_id); 814 b->mem.pos = b->mem.start; 815 b->mem.free = b->mem.start + mmap_msg->size; 816 b->mem.end = b->mem.start + nchunks * PORT_MMAP_CHUNK_SIZE; 817 818 b->parent = mmap_handler; 819 nxt_port_mmap_handler_use(mmap_handler, 1); 820 821 nxt_debug(task, "incoming mmap buf allocation: %p [%p,%uz] %PI->%PI,%d,%d", 822 b, b->mem.start, b->mem.end - b->mem.start, 823 hdr->src_pid, hdr->dst_pid, hdr->id, mmap_msg->chunk_id); 824 825 return b; 826 } 827 828 829 void 830 nxt_port_mmap_write(nxt_task_t *task, nxt_port_t *port, 831 nxt_port_send_msg_t *msg, nxt_sendbuf_coalesce_t *sb, void *mmsg_buf) 832 { 833 size_t bsize; 834 nxt_buf_t *bmem; 835 nxt_uint_t i; 836 nxt_port_mmap_msg_t *mmap_msg; 837 nxt_port_mmap_header_t *hdr; 838 nxt_port_mmap_handler_t *mmap_handler; 839 840 nxt_debug(task, "prepare %z bytes message for transfer to process %PI " 841 "via shared memory", sb->size, port->pid); 842 843 bsize = sb->niov * sizeof(nxt_port_mmap_msg_t); 844 mmap_msg = mmsg_buf; 845 846 bmem = msg->buf; 847 848 for (i = 0; i < sb->niov; i++, mmap_msg++) { 849 850 /* Lookup buffer which starts current iov_base. */ 851 while (bmem && sb->iobuf[i].iov_base != bmem->mem.pos) { 852 bmem = bmem->next; 853 } 854 855 if (nxt_slow_path(bmem == NULL)) { 856 nxt_log_error(NXT_LOG_ERR, task->log, 857 "failed to find buf for iobuf[%d]", i); 858 return; 859 /* TODO clear b and exit */ 860 } 861 862 mmap_handler = bmem->parent; 863 hdr = mmap_handler->hdr; 864 865 mmap_msg->mmap_id = hdr->id; 866 mmap_msg->chunk_id = nxt_port_mmap_chunk_id(hdr, bmem->mem.pos); 867 mmap_msg->size = sb->iobuf[i].iov_len; 868 869 nxt_debug(task, "mmap_msg={%D, %D, %D} to %PI", 870 mmap_msg->mmap_id, mmap_msg->chunk_id, mmap_msg->size, 871 port->pid); 872 } 873 874 sb->iobuf[0].iov_base = mmsg_buf; 875 sb->iobuf[0].iov_len = bsize; 876 sb->niov = 1; 877 sb->size = bsize; 878 879 msg->port_msg.mmap = 1; 880 } 881 882 883 void 884 nxt_port_mmap_read(nxt_task_t *task, nxt_port_recv_msg_t *msg) 885 { 886 nxt_buf_t *b, **pb; 887 nxt_port_mmap_msg_t *end, *mmap_msg; 888 889 pb = &msg->buf; 890 msg->size = 0; 891 892 for (b = msg->buf; b != NULL; b = b->next) { 893 894 mmap_msg = (nxt_port_mmap_msg_t *) b->mem.pos; 895 end = (nxt_port_mmap_msg_t *) b->mem.free; 896 897 while (mmap_msg < end) { 898 nxt_debug(task, "mmap_msg={%D, %D, %D} from %PI", 899 mmap_msg->mmap_id, mmap_msg->chunk_id, mmap_msg->size, 900 msg->port_msg.pid); 901 902 *pb = nxt_port_mmap_get_incoming_buf(task, msg->port, 903 msg->port_msg.pid, mmap_msg); 904 if (nxt_slow_path(*pb == NULL)) { 905 nxt_log_error(NXT_LOG_ERR, task->log, 906 "failed to get mmap buffer"); 907 908 break; 909 } 910 911 msg->size += mmap_msg->size; 912 pb = &(*pb)->next; 913 mmap_msg++; 914 915 /* Mark original buf as complete. */ 916 b->mem.pos += sizeof(nxt_port_mmap_msg_t); 917 } 918 } 919 } 920 921 922 nxt_port_method_t 923 nxt_port_mmap_get_method(nxt_task_t *task, nxt_port_t *port, nxt_buf_t *b) 924 { 925 nxt_port_method_t m; 926 nxt_port_mmap_header_t *hdr; 927 nxt_port_mmap_handler_t *mmap_handler; 928 929 m = NXT_PORT_METHOD_ANY; 930 931 for (/* void */; b != NULL; b = b->next) { 932 if (nxt_buf_used_size(b) == 0) { 933 /* empty buffers does not affect method */ 934 continue; 935 } 936 937 if (nxt_buf_is_port_mmap(b)) { 938 mmap_handler = b->parent; 939 hdr = mmap_handler->hdr; 940 941 if (m == NXT_PORT_METHOD_PLAIN) { 942 nxt_log_error(NXT_LOG_ERR, task->log, 943 "mixing plain and mmap buffers, " 944 "using plain mode"); 945 946 break; 947 } 948 949 if (port->pid != hdr->dst_pid) { 950 nxt_log_error(NXT_LOG_ERR, task->log, 951 "send mmap buffer for %PI to %PI, " 952 "using plain mode", hdr->dst_pid, port->pid); 953 954 m = NXT_PORT_METHOD_PLAIN; 955 956 break; 957 } 958 959 if (m == NXT_PORT_METHOD_ANY) { 960 nxt_debug(task, "using mmap mode"); 961 962 m = NXT_PORT_METHOD_MMAP; 963 } 964 } else { 965 if (m == NXT_PORT_METHOD_MMAP) { 966 nxt_log_error(NXT_LOG_ERR, task->log, 967 "mixing mmap and plain buffers, " 968 "switching to plain mode"); 969 970 m = NXT_PORT_METHOD_PLAIN; 971 972 break; 973 } 974 975 if (m == NXT_PORT_METHOD_ANY) { 976 nxt_debug(task, "using plain mode"); 977 978 m = NXT_PORT_METHOD_PLAIN; 979 } 980 } 981 } 982 983 return m; 984 } 985