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