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_int_t n, nxt_bool_t tracking) 398 { 399 nxt_int_t i, res, nchunks; 400 nxt_process_t *process; 401 nxt_free_map_t *free_map; 402 nxt_port_mmap_t *port_mmap; 403 nxt_port_mmap_t *end_port_mmap; 404 nxt_port_mmap_header_t *hdr; 405 nxt_port_mmap_handler_t *mmap_handler; 406 407 process = port->process; 408 if (nxt_slow_path(process == NULL)) { 409 return NULL; 410 } 411 412 nxt_thread_mutex_lock(&process->outgoing.mutex); 413 414 end_port_mmap = process->outgoing.elts + process->outgoing.size; 415 416 for (port_mmap = process->outgoing.elts; 417 port_mmap < end_port_mmap; 418 port_mmap++) 419 { 420 mmap_handler = port_mmap->mmap_handler; 421 hdr = mmap_handler->hdr; 422 423 if (hdr->sent_over != 0xFFFFu && hdr->sent_over != port->id) { 424 continue; 425 } 426 427 *c = 0; 428 429 free_map = tracking ? hdr->free_tracking_map : hdr->free_map; 430 431 while (nxt_port_mmap_get_free_chunk(free_map, c)) { 432 nchunks = 1; 433 434 while (nchunks < n) { 435 res = nxt_port_mmap_chk_set_chunk_busy(free_map, *c + nchunks); 436 437 if (res == 0) { 438 for (i = 0; i < nchunks; i++) { 439 nxt_port_mmap_set_chunk_free(free_map, *c + i); 440 } 441 442 *c += nchunks + 1; 443 nchunks = 0; 444 break; 445 } 446 447 nchunks++; 448 } 449 450 if (nchunks == n) { 451 goto unlock_return; 452 } 453 } 454 } 455 456 /* TODO introduce port_mmap limit and release wait. */ 457 458 *c = 0; 459 mmap_handler = nxt_port_new_port_mmap(task, process, port, tracking); 460 461 unlock_return: 462 463 nxt_thread_mutex_unlock(&process->outgoing.mutex); 464 465 return mmap_handler; 466 } 467 468 469 static nxt_port_mmap_handler_t * 470 nxt_port_get_port_incoming_mmap(nxt_task_t *task, nxt_pid_t spid, uint32_t id) 471 { 472 nxt_process_t *process; 473 nxt_port_mmap_handler_t *mmap_handler; 474 475 process = nxt_runtime_process_find(task->thread->runtime, spid); 476 if (nxt_slow_path(process == NULL)) { 477 return NULL; 478 } 479 480 nxt_thread_mutex_lock(&process->incoming.mutex); 481 482 if (nxt_fast_path(process->incoming.size > id)) { 483 mmap_handler = process->incoming.elts[id].mmap_handler; 484 485 } else { 486 mmap_handler = NULL; 487 488 nxt_debug(task, "invalid incoming mmap id %uD for pid %PI", id, spid); 489 } 490 491 nxt_thread_mutex_unlock(&process->incoming.mutex); 492 493 return mmap_handler; 494 } 495 496 497 nxt_int_t 498 nxt_port_mmap_get_tracking(nxt_task_t *task, nxt_port_t *port, 499 nxt_port_mmap_tracking_t *tracking, uint32_t stream) 500 { 501 nxt_chunk_id_t c; 502 nxt_port_mmap_header_t *hdr; 503 nxt_port_mmap_handler_t *mmap_handler; 504 505 nxt_debug(task, "request tracking for stream #%uD", stream); 506 507 mmap_handler = nxt_port_mmap_get(task, port, &c, 1, 1); 508 if (nxt_slow_path(mmap_handler == NULL)) { 509 return NXT_ERROR; 510 } 511 512 nxt_port_mmap_handler_use(mmap_handler, 1); 513 514 hdr = mmap_handler->hdr; 515 516 tracking->mmap_handler = mmap_handler; 517 tracking->tracking = hdr->tracking + c; 518 519 *tracking->tracking = stream; 520 521 nxt_debug(task, "outgoing tracking allocation: %PI->%PI,%d,%d", 522 hdr->src_pid, hdr->dst_pid, hdr->id, c); 523 524 return NXT_OK; 525 } 526 527 528 nxt_bool_t 529 nxt_port_mmap_tracking_cancel(nxt_task_t *task, 530 nxt_port_mmap_tracking_t *tracking, uint32_t stream) 531 { 532 nxt_bool_t res; 533 nxt_chunk_id_t c; 534 nxt_port_mmap_header_t *hdr; 535 nxt_port_mmap_handler_t *mmap_handler; 536 537 mmap_handler = tracking->mmap_handler; 538 539 if (nxt_slow_path(mmap_handler == NULL)) { 540 return 0; 541 } 542 543 hdr = mmap_handler->hdr; 544 545 res = nxt_atomic_cmp_set(tracking->tracking, stream, 0); 546 547 nxt_debug(task, "%s tracking for stream #%uD", 548 (res ? "cancelled" : "failed to cancel"), stream); 549 550 if (!res) { 551 c = tracking->tracking - hdr->tracking; 552 nxt_port_mmap_set_chunk_free(hdr->free_tracking_map, c); 553 } 554 555 nxt_port_mmap_handler_use(mmap_handler, -1); 556 557 return res; 558 } 559 560 561 nxt_int_t 562 nxt_port_mmap_tracking_write(uint32_t *buf, nxt_port_mmap_tracking_t *t) 563 { 564 nxt_port_mmap_handler_t *mmap_handler; 565 566 mmap_handler = t->mmap_handler; 567 568 #if (NXT_DEBUG) 569 { 570 nxt_atomic_t *tracking; 571 572 tracking = mmap_handler->hdr->tracking; 573 574 nxt_assert(t->tracking >= tracking); 575 nxt_assert(t->tracking < tracking + PORT_MMAP_CHUNK_COUNT); 576 } 577 #endif 578 579 buf[0] = mmap_handler->hdr->id; 580 buf[1] = t->tracking - mmap_handler->hdr->tracking; 581 582 return NXT_OK; 583 } 584 585 nxt_bool_t 586 nxt_port_mmap_tracking_read(nxt_task_t *task, nxt_port_recv_msg_t *msg) 587 { 588 nxt_buf_t *b; 589 nxt_bool_t res; 590 nxt_chunk_id_t c; 591 nxt_port_mmap_header_t *hdr; 592 nxt_port_mmap_handler_t *mmap_handler; 593 nxt_port_mmap_tracking_msg_t *tracking_msg; 594 595 b = msg->buf; 596 597 if (nxt_buf_used_size(b) < (int) sizeof(nxt_port_mmap_tracking_msg_t)) { 598 nxt_debug(task, "too small message %O", nxt_buf_used_size(b)); 599 return 0; 600 } 601 602 tracking_msg = (nxt_port_mmap_tracking_msg_t *) b->mem.pos; 603 604 b->mem.pos += sizeof(nxt_port_mmap_tracking_msg_t); 605 mmap_handler = nxt_port_get_port_incoming_mmap(task, msg->port_msg.pid, 606 tracking_msg->mmap_id); 607 608 if (nxt_slow_path(mmap_handler == NULL)) { 609 return 0; 610 } 611 612 hdr = mmap_handler->hdr; 613 614 c = tracking_msg->tracking_id; 615 res = nxt_atomic_cmp_set(hdr->tracking + c, msg->port_msg.stream, 0); 616 617 nxt_debug(task, "tracking for stream #%uD %s", msg->port_msg.stream, 618 (res ? "received" : "already cancelled")); 619 620 if (!res) { 621 nxt_port_mmap_set_chunk_free(hdr->free_tracking_map, c); 622 } 623 624 return res; 625 } 626 627 628 nxt_buf_t * 629 nxt_port_mmap_get_buf(nxt_task_t *task, nxt_port_t *port, size_t size) 630 { 631 nxt_mp_t *mp; 632 nxt_buf_t *b; 633 nxt_int_t nchunks; 634 nxt_chunk_id_t c; 635 nxt_port_mmap_header_t *hdr; 636 nxt_port_mmap_handler_t *mmap_handler; 637 638 nxt_debug(task, "request %z bytes shm buffer", size); 639 640 nchunks = (size + PORT_MMAP_CHUNK_SIZE - 1) / PORT_MMAP_CHUNK_SIZE; 641 642 if (nxt_slow_path(nchunks > PORT_MMAP_CHUNK_COUNT)) { 643 nxt_alert(task, "requested buffer (%z) too big", size); 644 645 return NULL; 646 } 647 648 b = nxt_buf_mem_ts_alloc(task, task->thread->engine->mem_pool, 0); 649 if (nxt_slow_path(b == NULL)) { 650 return NULL; 651 } 652 653 b->completion_handler = nxt_port_mmap_buf_completion; 654 nxt_buf_set_port_mmap(b); 655 656 mmap_handler = nxt_port_mmap_get(task, port, &c, nchunks, 0); 657 if (nxt_slow_path(mmap_handler == NULL)) { 658 mp = task->thread->engine->mem_pool; 659 nxt_mp_free(mp, b); 660 nxt_mp_release(mp); 661 return NULL; 662 } 663 664 b->parent = mmap_handler; 665 666 nxt_port_mmap_handler_use(mmap_handler, 1); 667 668 hdr = mmap_handler->hdr; 669 670 b->mem.start = nxt_port_mmap_chunk_start(hdr, c); 671 b->mem.pos = b->mem.start; 672 b->mem.free = b->mem.start; 673 b->mem.end = b->mem.start + nchunks * PORT_MMAP_CHUNK_SIZE; 674 675 nxt_debug(task, "outgoing mmap buf allocation: %p [%p,%uz] %PI->%PI,%d,%d", 676 b, b->mem.start, b->mem.end - b->mem.start, 677 hdr->src_pid, hdr->dst_pid, hdr->id, c); 678 679 return b; 680 } 681 682 683 nxt_int_t 684 nxt_port_mmap_increase_buf(nxt_task_t *task, nxt_buf_t *b, size_t size, 685 size_t min_size) 686 { 687 size_t nchunks, free_size; 688 nxt_chunk_id_t c, start; 689 nxt_port_mmap_header_t *hdr; 690 nxt_port_mmap_handler_t *mmap_handler; 691 692 nxt_debug(task, "request increase %z bytes shm buffer", size); 693 694 if (nxt_slow_path(nxt_buf_is_port_mmap(b) == 0)) { 695 nxt_log(task, NXT_LOG_WARN, 696 "failed to increase, not a mmap buffer"); 697 return NXT_ERROR; 698 } 699 700 free_size = nxt_buf_mem_free_size(&b->mem); 701 702 if (nxt_slow_path(size <= free_size)) { 703 return NXT_OK; 704 } 705 706 mmap_handler = b->parent; 707 hdr = mmap_handler->hdr; 708 709 start = nxt_port_mmap_chunk_id(hdr, b->mem.end); 710 711 size -= free_size; 712 713 nchunks = size / PORT_MMAP_CHUNK_SIZE; 714 if ((size % PORT_MMAP_CHUNK_SIZE) != 0 || nchunks == 0) { 715 nchunks++; 716 } 717 718 c = start; 719 720 /* Try to acquire as much chunks as required. */ 721 while (nchunks > 0) { 722 723 if (nxt_port_mmap_chk_set_chunk_busy(hdr->free_map, c) == 0) { 724 break; 725 } 726 727 c++; 728 nchunks--; 729 } 730 731 if (nchunks != 0 732 && min_size > free_size + PORT_MMAP_CHUNK_SIZE * (c - start)) 733 { 734 c--; 735 while (c >= start) { 736 nxt_port_mmap_set_chunk_free(hdr->free_map, c); 737 c--; 738 } 739 740 nxt_debug(task, "failed to increase, %uz chunks busy", nchunks); 741 742 return NXT_ERROR; 743 744 } else { 745 b->mem.end += PORT_MMAP_CHUNK_SIZE * (c - start); 746 747 return NXT_OK; 748 } 749 } 750 751 752 static nxt_buf_t * 753 nxt_port_mmap_get_incoming_buf(nxt_task_t *task, nxt_port_t *port, 754 nxt_pid_t spid, nxt_port_mmap_msg_t *mmap_msg) 755 { 756 size_t nchunks; 757 nxt_buf_t *b; 758 nxt_port_mmap_header_t *hdr; 759 nxt_port_mmap_handler_t *mmap_handler; 760 761 mmap_handler = nxt_port_get_port_incoming_mmap(task, spid, 762 mmap_msg->mmap_id); 763 if (nxt_slow_path(mmap_handler == NULL)) { 764 return NULL; 765 } 766 767 b = nxt_buf_mem_ts_alloc(task, port->mem_pool, 0); 768 if (nxt_slow_path(b == NULL)) { 769 return NULL; 770 } 771 772 b->completion_handler = nxt_port_mmap_buf_completion; 773 774 nxt_buf_set_port_mmap(b); 775 776 nchunks = mmap_msg->size / PORT_MMAP_CHUNK_SIZE; 777 if ((mmap_msg->size % PORT_MMAP_CHUNK_SIZE) != 0) { 778 nchunks++; 779 } 780 781 hdr = mmap_handler->hdr; 782 783 b->mem.start = nxt_port_mmap_chunk_start(hdr, mmap_msg->chunk_id); 784 b->mem.pos = b->mem.start; 785 b->mem.free = b->mem.start + mmap_msg->size; 786 b->mem.end = b->mem.start + nchunks * PORT_MMAP_CHUNK_SIZE; 787 788 b->parent = mmap_handler; 789 nxt_port_mmap_handler_use(mmap_handler, 1); 790 791 nxt_debug(task, "incoming mmap buf allocation: %p [%p,%uz] %PI->%PI,%d,%d", 792 b, b->mem.start, b->mem.end - b->mem.start, 793 hdr->src_pid, hdr->dst_pid, hdr->id, mmap_msg->chunk_id); 794 795 return b; 796 } 797 798 799 void 800 nxt_port_mmap_write(nxt_task_t *task, nxt_port_t *port, 801 nxt_port_send_msg_t *msg, nxt_sendbuf_coalesce_t *sb) 802 { 803 size_t bsize; 804 nxt_buf_t *bmem; 805 nxt_uint_t i; 806 nxt_port_mmap_msg_t *mmap_msg; 807 nxt_port_mmap_header_t *hdr; 808 nxt_port_mmap_handler_t *mmap_handler; 809 810 nxt_debug(task, "prepare %z bytes message for transfer to process %PI " 811 "via shared memory", sb->size, port->pid); 812 813 bsize = sb->niov * sizeof(nxt_port_mmap_msg_t); 814 mmap_msg = port->mmsg_buf; 815 816 bmem = msg->buf; 817 818 for (i = 0; i < sb->niov; i++, mmap_msg++) { 819 820 /* Lookup buffer which starts current iov_base. */ 821 while (bmem && sb->iobuf[i].iov_base != bmem->mem.pos) { 822 bmem = bmem->next; 823 } 824 825 if (nxt_slow_path(bmem == NULL)) { 826 nxt_log_error(NXT_LOG_ERR, task->log, 827 "failed to find buf for iobuf[%d]", i); 828 return; 829 /* TODO clear b and exit */ 830 } 831 832 mmap_handler = bmem->parent; 833 hdr = mmap_handler->hdr; 834 835 mmap_msg->mmap_id = hdr->id; 836 mmap_msg->chunk_id = nxt_port_mmap_chunk_id(hdr, bmem->mem.pos); 837 mmap_msg->size = sb->iobuf[i].iov_len; 838 839 nxt_debug(task, "mmap_msg={%D, %D, %D} to %PI", 840 mmap_msg->mmap_id, mmap_msg->chunk_id, mmap_msg->size, 841 port->pid); 842 } 843 844 sb->iobuf[0].iov_base = port->mmsg_buf; 845 sb->iobuf[0].iov_len = bsize; 846 sb->niov = 1; 847 sb->size = bsize; 848 849 msg->port_msg.mmap = 1; 850 } 851 852 853 void 854 nxt_port_mmap_read(nxt_task_t *task, nxt_port_recv_msg_t *msg) 855 { 856 nxt_buf_t *b, **pb; 857 nxt_port_mmap_msg_t *end, *mmap_msg; 858 859 pb = &msg->buf; 860 msg->size = 0; 861 862 for (b = msg->buf; b != NULL; b = b->next) { 863 864 mmap_msg = (nxt_port_mmap_msg_t *) b->mem.pos; 865 end = (nxt_port_mmap_msg_t *) b->mem.free; 866 867 while (mmap_msg < end) { 868 nxt_debug(task, "mmap_msg={%D, %D, %D} from %PI", 869 mmap_msg->mmap_id, mmap_msg->chunk_id, mmap_msg->size, 870 msg->port_msg.pid); 871 872 *pb = nxt_port_mmap_get_incoming_buf(task, msg->port, 873 msg->port_msg.pid, mmap_msg); 874 if (nxt_slow_path(*pb == NULL)) { 875 nxt_log_error(NXT_LOG_ERR, task->log, 876 "failed to get mmap buffer"); 877 878 break; 879 } 880 881 msg->size += mmap_msg->size; 882 pb = &(*pb)->next; 883 mmap_msg++; 884 885 /* Mark original buf as complete. */ 886 b->mem.pos += sizeof(nxt_port_mmap_msg_t); 887 } 888 } 889 } 890 891 892 nxt_port_method_t 893 nxt_port_mmap_get_method(nxt_task_t *task, nxt_port_t *port, nxt_buf_t *b) 894 { 895 nxt_port_method_t m; 896 nxt_port_mmap_header_t *hdr; 897 nxt_port_mmap_handler_t *mmap_handler; 898 899 m = NXT_PORT_METHOD_ANY; 900 901 for (/* void */; b != NULL; b = b->next) { 902 if (nxt_buf_used_size(b) == 0) { 903 /* empty buffers does not affect method */ 904 continue; 905 } 906 907 if (nxt_buf_is_port_mmap(b)) { 908 mmap_handler = b->parent; 909 hdr = mmap_handler->hdr; 910 911 if (m == NXT_PORT_METHOD_PLAIN) { 912 nxt_log_error(NXT_LOG_ERR, task->log, 913 "mixing plain and mmap buffers, " 914 "using plain mode"); 915 916 break; 917 } 918 919 if (port->pid != hdr->dst_pid) { 920 nxt_log_error(NXT_LOG_ERR, task->log, 921 "send mmap buffer for %PI to %PI, " 922 "using plain mode", hdr->dst_pid, port->pid); 923 924 m = NXT_PORT_METHOD_PLAIN; 925 926 break; 927 } 928 929 if (m == NXT_PORT_METHOD_ANY) { 930 nxt_debug(task, "using mmap mode"); 931 932 m = NXT_PORT_METHOD_MMAP; 933 } 934 } else { 935 if (m == NXT_PORT_METHOD_MMAP) { 936 nxt_log_error(NXT_LOG_ERR, task->log, 937 "mixing mmap and plain buffers, " 938 "switching to plain mode"); 939 940 m = NXT_PORT_METHOD_PLAIN; 941 942 break; 943 } 944 945 if (m == NXT_PORT_METHOD_ANY) { 946 nxt_debug(task, "using plain mode"); 947 948 m = NXT_PORT_METHOD_PLAIN; 949 } 950 } 951 } 952 953 return m; 954 } 955