1 /*- 2 * Copyright (c) 2012 The FreeBSD Foundation 3 * All rights reserved. 4 * 5 * This software was developed by Edward Tomasz Napierala under sponsorship 6 * from the FreeBSD Foundation. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 * 29 * $FreeBSD$ 30 */ 31 32 /* 33 * iSCSI Common Layer. It's used by both the initiator and target to send 34 * and receive iSCSI PDUs. 35 */ 36 37 #include <sys/param.h> 38 #include <sys/capsicum.h> 39 #include <sys/condvar.h> 40 #include <sys/conf.h> 41 #include <sys/file.h> 42 #include <sys/kernel.h> 43 #include <sys/kthread.h> 44 #include <sys/lock.h> 45 #include <sys/mbuf.h> 46 #include <sys/mutex.h> 47 #include <sys/module.h> 48 #include <sys/protosw.h> 49 #include <sys/socket.h> 50 #include <sys/socketvar.h> 51 #include <sys/sysctl.h> 52 #include <sys/systm.h> 53 #include <sys/sx.h> 54 #include <sys/uio.h> 55 #include <vm/uma.h> 56 #include <netinet/in.h> 57 #include <netinet/tcp.h> 58 59 #include "icl.h" 60 #include "iscsi_proto.h" 61 62 SYSCTL_NODE(_kern, OID_AUTO, icl, CTLFLAG_RD, 0, "iSCSI Common Layer"); 63 static int debug = 1; 64 TUNABLE_INT("kern.icl.debug", &debug); 65 SYSCTL_INT(_kern_icl, OID_AUTO, debug, CTLFLAG_RWTUN, 66 &debug, 0, "Enable debug messages"); 67 static int coalesce = 1; 68 TUNABLE_INT("kern.icl.coalesce", &coalesce); 69 SYSCTL_INT(_kern_icl, OID_AUTO, coalesce, CTLFLAG_RWTUN, 70 &coalesce, 0, "Try to coalesce PDUs before sending"); 71 static int partial_receive_len = 128 * 1024; 72 TUNABLE_INT("kern.icl.partial_receive_len", &partial_receive_len); 73 SYSCTL_INT(_kern_icl, OID_AUTO, partial_receive_len, CTLFLAG_RWTUN, 74 &partial_receive_len, 0, "Minimum read size for partially received " 75 "data segment"); 76 static int sendspace = 1048576; 77 TUNABLE_INT("kern.icl.sendspace", &sendspace); 78 SYSCTL_INT(_kern_icl, OID_AUTO, sendspace, CTLFLAG_RWTUN, 79 &sendspace, 0, "Default send socket buffer size"); 80 static int recvspace = 1048576; 81 TUNABLE_INT("kern.icl.recvspace", &recvspace); 82 SYSCTL_INT(_kern_icl, OID_AUTO, recvspace, CTLFLAG_RWTUN, 83 &recvspace, 0, "Default receive socket buffer size"); 84 85 static uma_zone_t icl_conn_zone; 86 static uma_zone_t icl_pdu_zone; 87 88 static volatile u_int icl_ncons; 89 90 #define ICL_DEBUG(X, ...) \ 91 do { \ 92 if (debug > 1) \ 93 printf("%s: " X "\n", __func__, ## __VA_ARGS__);\ 94 } while (0) 95 96 #define ICL_WARN(X, ...) \ 97 do { \ 98 if (debug > 0) { \ 99 printf("WARNING: %s: " X "\n", \ 100 __func__, ## __VA_ARGS__); \ 101 } \ 102 } while (0) 103 104 #define ICL_CONN_LOCK(X) mtx_lock(X->ic_lock) 105 #define ICL_CONN_UNLOCK(X) mtx_unlock(X->ic_lock) 106 #define ICL_CONN_LOCK_ASSERT(X) mtx_assert(X->ic_lock, MA_OWNED) 107 #define ICL_CONN_LOCK_ASSERT_NOT(X) mtx_assert(X->ic_lock, MA_NOTOWNED) 108 109 STAILQ_HEAD(icl_pdu_stailq, icl_pdu); 110 111 static void 112 icl_conn_fail(struct icl_conn *ic) 113 { 114 if (ic->ic_socket == NULL) 115 return; 116 117 /* 118 * XXX 119 */ 120 ic->ic_socket->so_error = EDOOFUS; 121 (ic->ic_error)(ic); 122 } 123 124 static struct mbuf * 125 icl_conn_receive(struct icl_conn *ic, size_t len) 126 { 127 struct uio uio; 128 struct socket *so; 129 struct mbuf *m; 130 int error, flags; 131 132 so = ic->ic_socket; 133 134 memset(&uio, 0, sizeof(uio)); 135 uio.uio_resid = len; 136 137 flags = MSG_DONTWAIT; 138 error = soreceive(so, NULL, &uio, &m, NULL, &flags); 139 if (error != 0) { 140 ICL_DEBUG("soreceive error %d", error); 141 return (NULL); 142 } 143 if (uio.uio_resid != 0) { 144 m_freem(m); 145 ICL_DEBUG("short read"); 146 return (NULL); 147 } 148 149 return (m); 150 } 151 152 static struct icl_pdu * 153 icl_pdu_new(struct icl_conn *ic, int flags) 154 { 155 struct icl_pdu *ip; 156 157 #ifdef DIAGNOSTIC 158 refcount_acquire(&ic->ic_outstanding_pdus); 159 #endif 160 ip = uma_zalloc(icl_pdu_zone, flags | M_ZERO); 161 if (ip == NULL) { 162 ICL_WARN("failed to allocate %zd bytes", sizeof(*ip)); 163 #ifdef DIAGNOSTIC 164 refcount_release(&ic->ic_outstanding_pdus); 165 #endif 166 return (NULL); 167 } 168 169 ip->ip_conn = ic; 170 171 return (ip); 172 } 173 174 void 175 icl_pdu_free(struct icl_pdu *ip) 176 { 177 struct icl_conn *ic; 178 179 ic = ip->ip_conn; 180 181 m_freem(ip->ip_bhs_mbuf); 182 m_freem(ip->ip_ahs_mbuf); 183 m_freem(ip->ip_data_mbuf); 184 uma_zfree(icl_pdu_zone, ip); 185 #ifdef DIAGNOSTIC 186 refcount_release(&ic->ic_outstanding_pdus); 187 #endif 188 } 189 190 /* 191 * Allocate icl_pdu with empty BHS to fill up by the caller. 192 */ 193 struct icl_pdu * 194 icl_pdu_new_bhs(struct icl_conn *ic, int flags) 195 { 196 struct icl_pdu *ip; 197 198 ip = icl_pdu_new(ic, flags); 199 if (ip == NULL) 200 return (NULL); 201 202 ip->ip_bhs_mbuf = m_getm2(NULL, sizeof(struct iscsi_bhs), 203 flags, MT_DATA, M_PKTHDR); 204 if (ip->ip_bhs_mbuf == NULL) { 205 ICL_WARN("failed to allocate %zd bytes", sizeof(*ip)); 206 icl_pdu_free(ip); 207 return (NULL); 208 } 209 ip->ip_bhs = mtod(ip->ip_bhs_mbuf, struct iscsi_bhs *); 210 memset(ip->ip_bhs, 0, sizeof(struct iscsi_bhs)); 211 ip->ip_bhs_mbuf->m_len = sizeof(struct iscsi_bhs); 212 213 return (ip); 214 } 215 216 static int 217 icl_pdu_ahs_length(const struct icl_pdu *request) 218 { 219 220 return (request->ip_bhs->bhs_total_ahs_len * 4); 221 } 222 223 size_t 224 icl_pdu_data_segment_length(const struct icl_pdu *request) 225 { 226 uint32_t len = 0; 227 228 len += request->ip_bhs->bhs_data_segment_len[0]; 229 len <<= 8; 230 len += request->ip_bhs->bhs_data_segment_len[1]; 231 len <<= 8; 232 len += request->ip_bhs->bhs_data_segment_len[2]; 233 234 return (len); 235 } 236 237 static void 238 icl_pdu_set_data_segment_length(struct icl_pdu *response, uint32_t len) 239 { 240 241 response->ip_bhs->bhs_data_segment_len[2] = len; 242 response->ip_bhs->bhs_data_segment_len[1] = len >> 8; 243 response->ip_bhs->bhs_data_segment_len[0] = len >> 16; 244 } 245 246 static size_t 247 icl_pdu_padding(const struct icl_pdu *ip) 248 { 249 250 if ((ip->ip_data_len % 4) != 0) 251 return (4 - (ip->ip_data_len % 4)); 252 253 return (0); 254 } 255 256 static size_t 257 icl_pdu_size(const struct icl_pdu *response) 258 { 259 size_t len; 260 261 KASSERT(response->ip_ahs_len == 0, ("responding with AHS")); 262 263 len = sizeof(struct iscsi_bhs) + response->ip_data_len + 264 icl_pdu_padding(response); 265 if (response->ip_conn->ic_header_crc32c) 266 len += ISCSI_HEADER_DIGEST_SIZE; 267 if (response->ip_data_len != 0 && response->ip_conn->ic_data_crc32c) 268 len += ISCSI_DATA_DIGEST_SIZE; 269 270 return (len); 271 } 272 273 static int 274 icl_pdu_receive_bhs(struct icl_pdu *request, size_t *availablep) 275 { 276 struct mbuf *m; 277 278 m = icl_conn_receive(request->ip_conn, sizeof(struct iscsi_bhs)); 279 if (m == NULL) { 280 ICL_DEBUG("failed to receive BHS"); 281 return (-1); 282 } 283 284 request->ip_bhs_mbuf = m_pullup(m, sizeof(struct iscsi_bhs)); 285 if (request->ip_bhs_mbuf == NULL) { 286 ICL_WARN("m_pullup failed"); 287 return (-1); 288 } 289 request->ip_bhs = mtod(request->ip_bhs_mbuf, struct iscsi_bhs *); 290 291 /* 292 * XXX: For architectures with strict alignment requirements 293 * we may need to allocate ip_bhs and copy the data into it. 294 * For some reason, though, not doing this doesn't seem 295 * to cause problems; tested on sparc64. 296 */ 297 298 *availablep -= sizeof(struct iscsi_bhs); 299 return (0); 300 } 301 302 static int 303 icl_pdu_receive_ahs(struct icl_pdu *request, size_t *availablep) 304 { 305 306 request->ip_ahs_len = icl_pdu_ahs_length(request); 307 if (request->ip_ahs_len == 0) 308 return (0); 309 310 request->ip_ahs_mbuf = icl_conn_receive(request->ip_conn, 311 request->ip_ahs_len); 312 if (request->ip_ahs_mbuf == NULL) { 313 ICL_DEBUG("failed to receive AHS"); 314 return (-1); 315 } 316 317 *availablep -= request->ip_ahs_len; 318 return (0); 319 } 320 321 static uint32_t 322 icl_mbuf_to_crc32c(const struct mbuf *m0) 323 { 324 uint32_t digest = 0xffffffff; 325 const struct mbuf *m; 326 327 for (m = m0; m != NULL; m = m->m_next) 328 digest = calculate_crc32c(digest, 329 mtod(m, const void *), m->m_len); 330 331 digest = digest ^ 0xffffffff; 332 333 return (digest); 334 } 335 336 static int 337 icl_pdu_check_header_digest(struct icl_pdu *request, size_t *availablep) 338 { 339 struct mbuf *m; 340 uint32_t received_digest, valid_digest; 341 342 if (request->ip_conn->ic_header_crc32c == false) 343 return (0); 344 345 m = icl_conn_receive(request->ip_conn, ISCSI_HEADER_DIGEST_SIZE); 346 if (m == NULL) { 347 ICL_DEBUG("failed to receive header digest"); 348 return (-1); 349 } 350 351 CTASSERT(sizeof(received_digest) == ISCSI_HEADER_DIGEST_SIZE); 352 m_copydata(m, 0, ISCSI_HEADER_DIGEST_SIZE, (void *)&received_digest); 353 m_freem(m); 354 355 *availablep -= ISCSI_HEADER_DIGEST_SIZE; 356 357 /* 358 * XXX: Handle AHS. 359 */ 360 valid_digest = icl_mbuf_to_crc32c(request->ip_bhs_mbuf); 361 if (received_digest != valid_digest) { 362 ICL_WARN("header digest check failed; got 0x%x, " 363 "should be 0x%x", received_digest, valid_digest); 364 return (-1); 365 } 366 367 return (0); 368 } 369 370 /* 371 * Return the number of bytes that should be waiting in the receive socket 372 * before icl_pdu_receive_data_segment() gets called. 373 */ 374 static size_t 375 icl_pdu_data_segment_receive_len(const struct icl_pdu *request) 376 { 377 size_t len; 378 379 len = icl_pdu_data_segment_length(request); 380 if (len == 0) 381 return (0); 382 383 /* 384 * Account for the parts of data segment already read from 385 * the socket buffer. 386 */ 387 KASSERT(len > request->ip_data_len, ("len <= request->ip_data_len")); 388 len -= request->ip_data_len; 389 390 /* 391 * Don't always wait for the full data segment to be delivered 392 * to the socket; this might badly affect performance due to 393 * TCP window scaling. 394 */ 395 if (len > partial_receive_len) { 396 #if 0 397 ICL_DEBUG("need %zd bytes of data, limiting to %zd", 398 len, partial_receive_len)); 399 #endif 400 len = partial_receive_len; 401 402 return (len); 403 } 404 405 /* 406 * Account for padding. Note that due to the way code is written, 407 * the icl_pdu_receive_data_segment() must always receive padding 408 * along with the last part of data segment, because it would be 409 * impossible to tell whether we've already received the full data 410 * segment including padding, or without it. 411 */ 412 if ((len % 4) != 0) 413 len += 4 - (len % 4); 414 415 #if 0 416 ICL_DEBUG("need %zd bytes of data", len)); 417 #endif 418 419 return (len); 420 } 421 422 static int 423 icl_pdu_receive_data_segment(struct icl_pdu *request, 424 size_t *availablep, bool *more_neededp) 425 { 426 struct icl_conn *ic; 427 size_t len, padding = 0; 428 struct mbuf *m; 429 430 ic = request->ip_conn; 431 432 *more_neededp = false; 433 ic->ic_receive_len = 0; 434 435 len = icl_pdu_data_segment_length(request); 436 if (len == 0) 437 return (0); 438 439 if ((len % 4) != 0) 440 padding = 4 - (len % 4); 441 442 /* 443 * Account for already received parts of data segment. 444 */ 445 KASSERT(len > request->ip_data_len, ("len <= request->ip_data_len")); 446 len -= request->ip_data_len; 447 448 if (len + padding > *availablep) { 449 /* 450 * Not enough data in the socket buffer. Receive as much 451 * as we can. Don't receive padding, since, obviously, it's 452 * not the end of data segment yet. 453 */ 454 #if 0 455 ICL_DEBUG("limited from %zd to %zd", 456 len + padding, *availablep - padding)); 457 #endif 458 len = *availablep - padding; 459 *more_neededp = true; 460 padding = 0; 461 } 462 463 /* 464 * Must not try to receive padding without at least one byte 465 * of actual data segment. 466 */ 467 if (len > 0) { 468 m = icl_conn_receive(request->ip_conn, len + padding); 469 if (m == NULL) { 470 ICL_DEBUG("failed to receive data segment"); 471 return (-1); 472 } 473 474 if (request->ip_data_mbuf == NULL) 475 request->ip_data_mbuf = m; 476 else 477 m_cat(request->ip_data_mbuf, m); 478 479 request->ip_data_len += len; 480 *availablep -= len + padding; 481 } else 482 ICL_DEBUG("len 0"); 483 484 if (*more_neededp) 485 ic->ic_receive_len = 486 icl_pdu_data_segment_receive_len(request); 487 488 return (0); 489 } 490 491 static int 492 icl_pdu_check_data_digest(struct icl_pdu *request, size_t *availablep) 493 { 494 struct mbuf *m; 495 uint32_t received_digest, valid_digest; 496 497 if (request->ip_conn->ic_data_crc32c == false) 498 return (0); 499 500 if (request->ip_data_len == 0) 501 return (0); 502 503 m = icl_conn_receive(request->ip_conn, ISCSI_DATA_DIGEST_SIZE); 504 if (m == NULL) { 505 ICL_DEBUG("failed to receive data digest"); 506 return (-1); 507 } 508 509 CTASSERT(sizeof(received_digest) == ISCSI_DATA_DIGEST_SIZE); 510 m_copydata(m, 0, ISCSI_DATA_DIGEST_SIZE, (void *)&received_digest); 511 m_freem(m); 512 513 *availablep -= ISCSI_DATA_DIGEST_SIZE; 514 515 /* 516 * Note that ip_data_mbuf also contains padding; since digest 517 * calculation is supposed to include that, we iterate over 518 * the entire ip_data_mbuf chain, not just ip_data_len bytes of it. 519 */ 520 valid_digest = icl_mbuf_to_crc32c(request->ip_data_mbuf); 521 if (received_digest != valid_digest) { 522 ICL_WARN("data digest check failed; got 0x%x, " 523 "should be 0x%x", received_digest, valid_digest); 524 return (-1); 525 } 526 527 return (0); 528 } 529 530 /* 531 * Somewhat contrary to the name, this attempts to receive only one 532 * "part" of PDU at a time; call it repeatedly until it returns non-NULL. 533 */ 534 static struct icl_pdu * 535 icl_conn_receive_pdu(struct icl_conn *ic, size_t *availablep) 536 { 537 struct icl_pdu *request; 538 struct socket *so; 539 size_t len; 540 int error; 541 bool more_needed; 542 543 so = ic->ic_socket; 544 545 if (ic->ic_receive_state == ICL_CONN_STATE_BHS) { 546 KASSERT(ic->ic_receive_pdu == NULL, 547 ("ic->ic_receive_pdu != NULL")); 548 request = icl_pdu_new(ic, M_NOWAIT); 549 if (request == NULL) { 550 ICL_DEBUG("failed to allocate PDU; " 551 "dropping connection"); 552 icl_conn_fail(ic); 553 return (NULL); 554 } 555 ic->ic_receive_pdu = request; 556 } else { 557 KASSERT(ic->ic_receive_pdu != NULL, 558 ("ic->ic_receive_pdu == NULL")); 559 request = ic->ic_receive_pdu; 560 } 561 562 if (*availablep < ic->ic_receive_len) { 563 #if 0 564 ICL_DEBUG("not enough data; need %zd, " 565 "have %zd", ic->ic_receive_len, *availablep); 566 #endif 567 return (NULL); 568 } 569 570 switch (ic->ic_receive_state) { 571 case ICL_CONN_STATE_BHS: 572 //ICL_DEBUG("receiving BHS"); 573 error = icl_pdu_receive_bhs(request, availablep); 574 if (error != 0) { 575 ICL_DEBUG("failed to receive BHS; " 576 "dropping connection"); 577 break; 578 } 579 580 /* 581 * We don't enforce any limit for AHS length; 582 * its length is stored in 8 bit field. 583 */ 584 585 len = icl_pdu_data_segment_length(request); 586 if (len > ic->ic_max_data_segment_length) { 587 ICL_WARN("received data segment " 588 "length %zd is larger than negotiated " 589 "MaxDataSegmentLength %zd; " 590 "dropping connection", 591 len, ic->ic_max_data_segment_length); 592 error = EINVAL; 593 break; 594 } 595 596 ic->ic_receive_state = ICL_CONN_STATE_AHS; 597 ic->ic_receive_len = icl_pdu_ahs_length(request); 598 break; 599 600 case ICL_CONN_STATE_AHS: 601 //ICL_DEBUG("receiving AHS"); 602 error = icl_pdu_receive_ahs(request, availablep); 603 if (error != 0) { 604 ICL_DEBUG("failed to receive AHS; " 605 "dropping connection"); 606 break; 607 } 608 ic->ic_receive_state = ICL_CONN_STATE_HEADER_DIGEST; 609 if (ic->ic_header_crc32c == false) 610 ic->ic_receive_len = 0; 611 else 612 ic->ic_receive_len = ISCSI_HEADER_DIGEST_SIZE; 613 break; 614 615 case ICL_CONN_STATE_HEADER_DIGEST: 616 //ICL_DEBUG("receiving header digest"); 617 error = icl_pdu_check_header_digest(request, availablep); 618 if (error != 0) { 619 ICL_DEBUG("header digest failed; " 620 "dropping connection"); 621 break; 622 } 623 624 ic->ic_receive_state = ICL_CONN_STATE_DATA; 625 ic->ic_receive_len = 626 icl_pdu_data_segment_receive_len(request); 627 break; 628 629 case ICL_CONN_STATE_DATA: 630 //ICL_DEBUG("receiving data segment"); 631 error = icl_pdu_receive_data_segment(request, availablep, 632 &more_needed); 633 if (error != 0) { 634 ICL_DEBUG("failed to receive data segment;" 635 "dropping connection"); 636 break; 637 } 638 639 if (more_needed) 640 break; 641 642 ic->ic_receive_state = ICL_CONN_STATE_DATA_DIGEST; 643 if (request->ip_data_len == 0 || ic->ic_data_crc32c == false) 644 ic->ic_receive_len = 0; 645 else 646 ic->ic_receive_len = ISCSI_DATA_DIGEST_SIZE; 647 break; 648 649 case ICL_CONN_STATE_DATA_DIGEST: 650 //ICL_DEBUG("receiving data digest"); 651 error = icl_pdu_check_data_digest(request, availablep); 652 if (error != 0) { 653 ICL_DEBUG("data digest failed; " 654 "dropping connection"); 655 break; 656 } 657 658 /* 659 * We've received complete PDU; reset the receive state machine 660 * and return the PDU. 661 */ 662 ic->ic_receive_state = ICL_CONN_STATE_BHS; 663 ic->ic_receive_len = sizeof(struct iscsi_bhs); 664 ic->ic_receive_pdu = NULL; 665 return (request); 666 667 default: 668 panic("invalid ic_receive_state %d\n", ic->ic_receive_state); 669 } 670 671 if (error != 0) { 672 icl_pdu_free(request); 673 icl_conn_fail(ic); 674 } 675 676 return (NULL); 677 } 678 679 static void 680 icl_conn_receive_pdus(struct icl_conn *ic, size_t available) 681 { 682 struct icl_pdu *response; 683 struct socket *so; 684 685 so = ic->ic_socket; 686 687 /* 688 * This can never happen; we're careful to only mess with ic->ic_socket 689 * pointer when the send/receive threads are not running. 690 */ 691 KASSERT(so != NULL, ("NULL socket")); 692 693 for (;;) { 694 if (ic->ic_disconnecting) 695 return; 696 697 if (so->so_error != 0) { 698 ICL_DEBUG("connection error %d; " 699 "dropping connection", so->so_error); 700 icl_conn_fail(ic); 701 return; 702 } 703 704 /* 705 * Loop until we have a complete PDU or there is not enough 706 * data in the socket buffer. 707 */ 708 if (available < ic->ic_receive_len) { 709 #if 0 710 ICL_DEBUG("not enough data; have %zd, " 711 "need %zd", available, 712 ic->ic_receive_len); 713 #endif 714 return; 715 } 716 717 response = icl_conn_receive_pdu(ic, &available); 718 if (response == NULL) 719 continue; 720 721 if (response->ip_ahs_len > 0) { 722 ICL_WARN("received PDU with unsupported " 723 "AHS; opcode 0x%x; dropping connection", 724 response->ip_bhs->bhs_opcode); 725 icl_pdu_free(response); 726 icl_conn_fail(ic); 727 return; 728 } 729 730 (ic->ic_receive)(response); 731 } 732 } 733 734 static void 735 icl_receive_thread(void *arg) 736 { 737 struct icl_conn *ic; 738 size_t available; 739 struct socket *so; 740 741 ic = arg; 742 so = ic->ic_socket; 743 744 ICL_CONN_LOCK(ic); 745 ic->ic_receive_running = true; 746 ICL_CONN_UNLOCK(ic); 747 748 for (;;) { 749 if (ic->ic_disconnecting) { 750 //ICL_DEBUG("terminating"); 751 break; 752 } 753 754 /* 755 * Set the low watermark, to be checked by 756 * soreadable() in icl_soupcall_receive() 757 * to avoid unneccessary wakeups until there 758 * is enough data received to read the PDU. 759 */ 760 SOCKBUF_LOCK(&so->so_rcv); 761 available = so->so_rcv.sb_cc; 762 if (available < ic->ic_receive_len) { 763 so->so_rcv.sb_lowat = ic->ic_receive_len; 764 cv_wait(&ic->ic_receive_cv, &so->so_rcv.sb_mtx); 765 } else 766 so->so_rcv.sb_lowat = so->so_rcv.sb_hiwat + 1; 767 SOCKBUF_UNLOCK(&so->so_rcv); 768 769 icl_conn_receive_pdus(ic, available); 770 } 771 772 ICL_CONN_LOCK(ic); 773 ic->ic_receive_running = false; 774 ICL_CONN_UNLOCK(ic); 775 kthread_exit(); 776 } 777 778 static int 779 icl_soupcall_receive(struct socket *so, void *arg, int waitflag) 780 { 781 struct icl_conn *ic; 782 783 if (!soreadable(so)) 784 return (SU_OK); 785 786 ic = arg; 787 cv_signal(&ic->ic_receive_cv); 788 return (SU_OK); 789 } 790 791 static int 792 icl_pdu_finalize(struct icl_pdu *request) 793 { 794 size_t padding, pdu_len; 795 uint32_t digest, zero = 0; 796 int ok; 797 struct icl_conn *ic; 798 799 ic = request->ip_conn; 800 801 icl_pdu_set_data_segment_length(request, request->ip_data_len); 802 803 pdu_len = icl_pdu_size(request); 804 805 if (ic->ic_header_crc32c) { 806 digest = icl_mbuf_to_crc32c(request->ip_bhs_mbuf); 807 ok = m_append(request->ip_bhs_mbuf, sizeof(digest), 808 (void *)&digest); 809 if (ok != 1) { 810 ICL_WARN("failed to append header digest"); 811 return (1); 812 } 813 } 814 815 if (request->ip_data_len != 0) { 816 padding = icl_pdu_padding(request); 817 if (padding > 0) { 818 ok = m_append(request->ip_data_mbuf, padding, 819 (void *)&zero); 820 if (ok != 1) { 821 ICL_WARN("failed to append padding"); 822 return (1); 823 } 824 } 825 826 if (ic->ic_data_crc32c) { 827 digest = icl_mbuf_to_crc32c(request->ip_data_mbuf); 828 829 ok = m_append(request->ip_data_mbuf, sizeof(digest), 830 (void *)&digest); 831 if (ok != 1) { 832 ICL_WARN("failed to append data digest"); 833 return (1); 834 } 835 } 836 837 m_cat(request->ip_bhs_mbuf, request->ip_data_mbuf); 838 request->ip_data_mbuf = NULL; 839 } 840 841 request->ip_bhs_mbuf->m_pkthdr.len = pdu_len; 842 843 return (0); 844 } 845 846 static void 847 icl_conn_send_pdus(struct icl_conn *ic, struct icl_pdu_stailq *queue) 848 { 849 struct icl_pdu *request, *request2; 850 struct socket *so; 851 size_t available, size, size2; 852 int coalesced, error; 853 854 ICL_CONN_LOCK_ASSERT_NOT(ic); 855 856 so = ic->ic_socket; 857 858 SOCKBUF_LOCK(&so->so_snd); 859 /* 860 * Check how much space do we have for transmit. We can't just 861 * call sosend() and retry when we get EWOULDBLOCK or EMSGSIZE, 862 * as it always frees the mbuf chain passed to it, even in case 863 * of error. 864 */ 865 available = sbspace(&so->so_snd); 866 867 /* 868 * Notify the socket upcall that we don't need wakeups 869 * for the time being. 870 */ 871 so->so_snd.sb_lowat = so->so_snd.sb_hiwat + 1; 872 SOCKBUF_UNLOCK(&so->so_snd); 873 874 while (!STAILQ_EMPTY(queue)) { 875 if (ic->ic_disconnecting) 876 return; 877 request = STAILQ_FIRST(queue); 878 size = icl_pdu_size(request); 879 if (available < size) { 880 #if 1 881 ICL_DEBUG("no space to send; " 882 "have %zd, need %zd", 883 available, size); 884 #endif 885 886 /* 887 * Set the low watermark, to be checked by 888 * sowritable() in icl_soupcall_send() 889 * to avoid unneccessary wakeups until there 890 * is enough space for the PDU to fit. 891 */ 892 SOCKBUF_LOCK(&so->so_snd); 893 so->so_snd.sb_lowat = size; 894 SOCKBUF_UNLOCK(&so->so_snd); 895 return; 896 } 897 STAILQ_REMOVE_HEAD(queue, ip_next); 898 error = icl_pdu_finalize(request); 899 if (error != 0) { 900 ICL_DEBUG("failed to finalize PDU; " 901 "dropping connection"); 902 icl_conn_fail(ic); 903 icl_pdu_free(request); 904 return; 905 } 906 if (coalesce) { 907 coalesced = 1; 908 for (;;) { 909 request2 = STAILQ_FIRST(queue); 910 if (request2 == NULL) 911 break; 912 size2 = icl_pdu_size(request2); 913 if (available < size + size2) 914 break; 915 STAILQ_REMOVE_HEAD(queue, ip_next); 916 error = icl_pdu_finalize(request2); 917 if (error != 0) { 918 ICL_DEBUG("failed to finalize PDU; " 919 "dropping connection"); 920 icl_conn_fail(ic); 921 icl_pdu_free(request); 922 icl_pdu_free(request2); 923 return; 924 } 925 m_cat(request->ip_bhs_mbuf, request2->ip_bhs_mbuf); 926 request2->ip_bhs_mbuf = NULL; 927 request->ip_bhs_mbuf->m_pkthdr.len += size2; 928 size += size2; 929 STAILQ_REMOVE_AFTER(queue, request, ip_next); 930 icl_pdu_free(request2); 931 coalesced++; 932 } 933 #if 0 934 if (coalesced > 1) { 935 ICL_DEBUG("coalesced %d PDUs into %zd bytes", 936 coalesced, size); 937 } 938 #endif 939 } 940 available -= size; 941 error = sosend(so, NULL, NULL, request->ip_bhs_mbuf, 942 NULL, MSG_DONTWAIT, curthread); 943 request->ip_bhs_mbuf = NULL; /* Sosend consumes the mbuf. */ 944 if (error != 0) { 945 ICL_DEBUG("failed to send PDU, error %d; " 946 "dropping connection", error); 947 icl_conn_fail(ic); 948 icl_pdu_free(request); 949 return; 950 } 951 icl_pdu_free(request); 952 } 953 } 954 955 static void 956 icl_send_thread(void *arg) 957 { 958 struct icl_conn *ic; 959 struct icl_pdu_stailq queue; 960 961 ic = arg; 962 963 STAILQ_INIT(&queue); 964 965 ICL_CONN_LOCK(ic); 966 ic->ic_send_running = true; 967 968 for (;;) { 969 if (ic->ic_disconnecting) { 970 //ICL_DEBUG("terminating"); 971 break; 972 } 973 974 for (;;) { 975 /* 976 * If the local queue is empty, populate it from 977 * the main one. This way the icl_conn_send_pdus() 978 * can go through all the queued PDUs without holding 979 * any locks. 980 */ 981 if (STAILQ_EMPTY(&queue)) 982 STAILQ_SWAP(&ic->ic_to_send, &queue, icl_pdu); 983 984 ic->ic_check_send_space = false; 985 ICL_CONN_UNLOCK(ic); 986 icl_conn_send_pdus(ic, &queue); 987 ICL_CONN_LOCK(ic); 988 989 /* 990 * The icl_soupcall_send() was called since the last 991 * call to sbspace(); go around; 992 */ 993 if (ic->ic_check_send_space) 994 continue; 995 996 /* 997 * Local queue is empty, but we still have PDUs 998 * in the main one; go around. 999 */ 1000 if (STAILQ_EMPTY(&queue) && 1001 !STAILQ_EMPTY(&ic->ic_to_send)) 1002 continue; 1003 1004 /* 1005 * There might be some stuff in the local queue, 1006 * which didn't get sent due to not having enough send 1007 * space. Wait for socket upcall. 1008 */ 1009 break; 1010 } 1011 1012 cv_wait(&ic->ic_send_cv, ic->ic_lock); 1013 } 1014 1015 /* 1016 * We're exiting; move PDUs back to the main queue, so they can 1017 * get freed properly. At this point ordering doesn't matter. 1018 */ 1019 STAILQ_CONCAT(&ic->ic_to_send, &queue); 1020 1021 ic->ic_send_running = false; 1022 ICL_CONN_UNLOCK(ic); 1023 kthread_exit(); 1024 } 1025 1026 static int 1027 icl_soupcall_send(struct socket *so, void *arg, int waitflag) 1028 { 1029 struct icl_conn *ic; 1030 1031 if (!sowriteable(so)) 1032 return (SU_OK); 1033 1034 ic = arg; 1035 1036 ICL_CONN_LOCK(ic); 1037 ic->ic_check_send_space = true; 1038 ICL_CONN_UNLOCK(ic); 1039 1040 cv_signal(&ic->ic_send_cv); 1041 1042 return (SU_OK); 1043 } 1044 1045 int 1046 icl_pdu_append_data(struct icl_pdu *request, const void *addr, size_t len, 1047 int flags) 1048 { 1049 struct mbuf *mb, *newmb; 1050 size_t copylen, off = 0; 1051 1052 KASSERT(len > 0, ("len == 0")); 1053 1054 newmb = m_getm2(NULL, len, flags, MT_DATA, M_PKTHDR); 1055 if (newmb == NULL) { 1056 ICL_WARN("failed to allocate mbuf for %zd bytes", len); 1057 return (ENOMEM); 1058 } 1059 1060 for (mb = newmb; mb != NULL; mb = mb->m_next) { 1061 copylen = min(M_TRAILINGSPACE(mb), len - off); 1062 memcpy(mtod(mb, char *), (const char *)addr + off, copylen); 1063 mb->m_len = copylen; 1064 off += copylen; 1065 } 1066 KASSERT(off == len, ("%s: off != len", __func__)); 1067 1068 if (request->ip_data_mbuf == NULL) { 1069 request->ip_data_mbuf = newmb; 1070 request->ip_data_len = len; 1071 } else { 1072 m_cat(request->ip_data_mbuf, newmb); 1073 request->ip_data_len += len; 1074 } 1075 1076 return (0); 1077 } 1078 1079 void 1080 icl_pdu_get_data(struct icl_pdu *ip, size_t off, void *addr, size_t len) 1081 { 1082 1083 m_copydata(ip->ip_data_mbuf, off, len, addr); 1084 } 1085 1086 void 1087 icl_pdu_queue(struct icl_pdu *ip) 1088 { 1089 struct icl_conn *ic; 1090 1091 ic = ip->ip_conn; 1092 1093 ICL_CONN_LOCK_ASSERT(ic); 1094 1095 if (ic->ic_disconnecting || ic->ic_socket == NULL) { 1096 ICL_DEBUG("icl_pdu_queue on closed connection"); 1097 icl_pdu_free(ip); 1098 return; 1099 } 1100 1101 if (!STAILQ_EMPTY(&ic->ic_to_send)) { 1102 STAILQ_INSERT_TAIL(&ic->ic_to_send, ip, ip_next); 1103 /* 1104 * If the queue is not empty, someone else had already 1105 * signaled the send thread; no need to do that again, 1106 * just return. 1107 */ 1108 return; 1109 } 1110 1111 STAILQ_INSERT_TAIL(&ic->ic_to_send, ip, ip_next); 1112 cv_signal(&ic->ic_send_cv); 1113 } 1114 1115 struct icl_conn * 1116 icl_conn_new(const char *name, struct mtx *lock) 1117 { 1118 struct icl_conn *ic; 1119 1120 refcount_acquire(&icl_ncons); 1121 1122 ic = uma_zalloc(icl_conn_zone, M_WAITOK | M_ZERO); 1123 1124 STAILQ_INIT(&ic->ic_to_send); 1125 ic->ic_lock = lock; 1126 cv_init(&ic->ic_send_cv, "icl_tx"); 1127 cv_init(&ic->ic_receive_cv, "icl_rx"); 1128 #ifdef DIAGNOSTIC 1129 refcount_init(&ic->ic_outstanding_pdus, 0); 1130 #endif 1131 ic->ic_max_data_segment_length = ICL_MAX_DATA_SEGMENT_LENGTH; 1132 ic->ic_name = name; 1133 1134 return (ic); 1135 } 1136 1137 void 1138 icl_conn_free(struct icl_conn *ic) 1139 { 1140 1141 cv_destroy(&ic->ic_send_cv); 1142 cv_destroy(&ic->ic_receive_cv); 1143 uma_zfree(icl_conn_zone, ic); 1144 refcount_release(&icl_ncons); 1145 } 1146 1147 static int 1148 icl_conn_start(struct icl_conn *ic) 1149 { 1150 size_t minspace; 1151 struct sockopt opt; 1152 int error, one = 1; 1153 1154 ICL_CONN_LOCK(ic); 1155 1156 /* 1157 * XXX: Ugly hack. 1158 */ 1159 if (ic->ic_socket == NULL) { 1160 ICL_CONN_UNLOCK(ic); 1161 return (EINVAL); 1162 } 1163 1164 ic->ic_receive_state = ICL_CONN_STATE_BHS; 1165 ic->ic_receive_len = sizeof(struct iscsi_bhs); 1166 ic->ic_disconnecting = false; 1167 1168 ICL_CONN_UNLOCK(ic); 1169 1170 /* 1171 * For sendspace, this is required because the current code cannot 1172 * send a PDU in pieces; thus, the minimum buffer size is equal 1173 * to the maximum PDU size. "+4" is to account for possible padding. 1174 * 1175 * What we should actually do here is to use autoscaling, but set 1176 * some minimal buffer size to "minspace". I don't know a way to do 1177 * that, though. 1178 */ 1179 minspace = sizeof(struct iscsi_bhs) + ic->ic_max_data_segment_length + 1180 ISCSI_HEADER_DIGEST_SIZE + ISCSI_DATA_DIGEST_SIZE + 4; 1181 if (sendspace < minspace) { 1182 ICL_WARN("kern.icl.sendspace too low; must be at least %zd", 1183 minspace); 1184 sendspace = minspace; 1185 } 1186 if (recvspace < minspace) { 1187 ICL_WARN("kern.icl.recvspace too low; must be at least %zd", 1188 minspace); 1189 recvspace = minspace; 1190 } 1191 1192 error = soreserve(ic->ic_socket, sendspace, recvspace); 1193 if (error != 0) { 1194 ICL_WARN("soreserve failed with error %d", error); 1195 icl_conn_close(ic); 1196 return (error); 1197 } 1198 1199 /* 1200 * Disable Nagle. 1201 */ 1202 bzero(&opt, sizeof(opt)); 1203 opt.sopt_dir = SOPT_SET; 1204 opt.sopt_level = IPPROTO_TCP; 1205 opt.sopt_name = TCP_NODELAY; 1206 opt.sopt_val = &one; 1207 opt.sopt_valsize = sizeof(one); 1208 error = sosetopt(ic->ic_socket, &opt); 1209 if (error != 0) { 1210 ICL_WARN("disabling TCP_NODELAY failed with error %d", error); 1211 icl_conn_close(ic); 1212 return (error); 1213 } 1214 1215 /* 1216 * Start threads. 1217 */ 1218 error = kthread_add(icl_send_thread, ic, NULL, NULL, 0, 0, "%stx", 1219 ic->ic_name); 1220 if (error != 0) { 1221 ICL_WARN("kthread_add(9) failed with error %d", error); 1222 icl_conn_close(ic); 1223 return (error); 1224 } 1225 1226 error = kthread_add(icl_receive_thread, ic, NULL, NULL, 0, 0, "%srx", 1227 ic->ic_name); 1228 if (error != 0) { 1229 ICL_WARN("kthread_add(9) failed with error %d", error); 1230 icl_conn_close(ic); 1231 return (error); 1232 } 1233 1234 /* 1235 * Register socket upcall, to get notified about incoming PDUs 1236 * and free space to send outgoing ones. 1237 */ 1238 SOCKBUF_LOCK(&ic->ic_socket->so_snd); 1239 soupcall_set(ic->ic_socket, SO_SND, icl_soupcall_send, ic); 1240 SOCKBUF_UNLOCK(&ic->ic_socket->so_snd); 1241 SOCKBUF_LOCK(&ic->ic_socket->so_rcv); 1242 soupcall_set(ic->ic_socket, SO_RCV, icl_soupcall_receive, ic); 1243 SOCKBUF_UNLOCK(&ic->ic_socket->so_rcv); 1244 1245 return (0); 1246 } 1247 1248 int 1249 icl_conn_handoff(struct icl_conn *ic, int fd) 1250 { 1251 struct file *fp; 1252 struct socket *so; 1253 cap_rights_t rights; 1254 int error; 1255 1256 ICL_CONN_LOCK_ASSERT_NOT(ic); 1257 1258 /* 1259 * Steal the socket from userland. 1260 */ 1261 error = fget(curthread, fd, 1262 cap_rights_init(&rights, CAP_SOCK_CLIENT), &fp); 1263 if (error != 0) 1264 return (error); 1265 if (fp->f_type != DTYPE_SOCKET) { 1266 fdrop(fp, curthread); 1267 return (EINVAL); 1268 } 1269 so = fp->f_data; 1270 if (so->so_type != SOCK_STREAM) { 1271 fdrop(fp, curthread); 1272 return (EINVAL); 1273 } 1274 1275 ICL_CONN_LOCK(ic); 1276 1277 if (ic->ic_socket != NULL) { 1278 ICL_CONN_UNLOCK(ic); 1279 fdrop(fp, curthread); 1280 return (EBUSY); 1281 } 1282 1283 ic->ic_socket = fp->f_data; 1284 fp->f_ops = &badfileops; 1285 fp->f_data = NULL; 1286 fdrop(fp, curthread); 1287 ICL_CONN_UNLOCK(ic); 1288 1289 error = icl_conn_start(ic); 1290 1291 return (error); 1292 } 1293 1294 void 1295 icl_conn_shutdown(struct icl_conn *ic) 1296 { 1297 ICL_CONN_LOCK_ASSERT_NOT(ic); 1298 1299 ICL_CONN_LOCK(ic); 1300 if (ic->ic_socket == NULL) { 1301 ICL_CONN_UNLOCK(ic); 1302 return; 1303 } 1304 ICL_CONN_UNLOCK(ic); 1305 1306 soshutdown(ic->ic_socket, SHUT_RDWR); 1307 } 1308 1309 void 1310 icl_conn_close(struct icl_conn *ic) 1311 { 1312 struct icl_pdu *pdu; 1313 1314 ICL_CONN_LOCK_ASSERT_NOT(ic); 1315 1316 ICL_CONN_LOCK(ic); 1317 if (ic->ic_socket == NULL) { 1318 ICL_CONN_UNLOCK(ic); 1319 return; 1320 } 1321 1322 /* 1323 * Deregister socket upcalls. 1324 */ 1325 ICL_CONN_UNLOCK(ic); 1326 SOCKBUF_LOCK(&ic->ic_socket->so_snd); 1327 if (ic->ic_socket->so_snd.sb_upcall != NULL) 1328 soupcall_clear(ic->ic_socket, SO_SND); 1329 SOCKBUF_UNLOCK(&ic->ic_socket->so_snd); 1330 SOCKBUF_LOCK(&ic->ic_socket->so_rcv); 1331 if (ic->ic_socket->so_rcv.sb_upcall != NULL) 1332 soupcall_clear(ic->ic_socket, SO_RCV); 1333 SOCKBUF_UNLOCK(&ic->ic_socket->so_rcv); 1334 ICL_CONN_LOCK(ic); 1335 1336 ic->ic_disconnecting = true; 1337 1338 /* 1339 * Wake up the threads, so they can properly terminate. 1340 */ 1341 cv_signal(&ic->ic_receive_cv); 1342 cv_signal(&ic->ic_send_cv); 1343 while (ic->ic_receive_running || ic->ic_send_running) { 1344 //ICL_DEBUG("waiting for send/receive threads to terminate"); 1345 ICL_CONN_UNLOCK(ic); 1346 cv_signal(&ic->ic_receive_cv); 1347 cv_signal(&ic->ic_send_cv); 1348 pause("icl_close", 1 * hz); 1349 ICL_CONN_LOCK(ic); 1350 } 1351 //ICL_DEBUG("send/receive threads terminated"); 1352 1353 ICL_CONN_UNLOCK(ic); 1354 soclose(ic->ic_socket); 1355 ICL_CONN_LOCK(ic); 1356 ic->ic_socket = NULL; 1357 1358 if (ic->ic_receive_pdu != NULL) { 1359 //ICL_DEBUG("freeing partially received PDU"); 1360 icl_pdu_free(ic->ic_receive_pdu); 1361 ic->ic_receive_pdu = NULL; 1362 } 1363 1364 /* 1365 * Remove any outstanding PDUs from the send queue. 1366 */ 1367 while (!STAILQ_EMPTY(&ic->ic_to_send)) { 1368 pdu = STAILQ_FIRST(&ic->ic_to_send); 1369 STAILQ_REMOVE_HEAD(&ic->ic_to_send, ip_next); 1370 icl_pdu_free(pdu); 1371 } 1372 1373 KASSERT(STAILQ_EMPTY(&ic->ic_to_send), 1374 ("destroying session with non-empty send queue")); 1375 #ifdef DIAGNOSTIC 1376 KASSERT(ic->ic_outstanding_pdus == 0, 1377 ("destroying session with %d outstanding PDUs", 1378 ic->ic_outstanding_pdus)); 1379 #endif 1380 ICL_CONN_UNLOCK(ic); 1381 } 1382 1383 bool 1384 icl_conn_connected(struct icl_conn *ic) 1385 { 1386 ICL_CONN_LOCK_ASSERT_NOT(ic); 1387 1388 ICL_CONN_LOCK(ic); 1389 if (ic->ic_socket == NULL) { 1390 ICL_CONN_UNLOCK(ic); 1391 return (false); 1392 } 1393 if (ic->ic_socket->so_error != 0) { 1394 ICL_CONN_UNLOCK(ic); 1395 return (false); 1396 } 1397 ICL_CONN_UNLOCK(ic); 1398 return (true); 1399 } 1400 1401 #ifdef ICL_KERNEL_PROXY 1402 int 1403 icl_conn_handoff_sock(struct icl_conn *ic, struct socket *so) 1404 { 1405 int error; 1406 1407 ICL_CONN_LOCK_ASSERT_NOT(ic); 1408 1409 if (so->so_type != SOCK_STREAM) 1410 return (EINVAL); 1411 1412 ICL_CONN_LOCK(ic); 1413 if (ic->ic_socket != NULL) { 1414 ICL_CONN_UNLOCK(ic); 1415 return (EBUSY); 1416 } 1417 ic->ic_socket = so; 1418 ICL_CONN_UNLOCK(ic); 1419 1420 error = icl_conn_start(ic); 1421 1422 return (error); 1423 } 1424 #endif /* ICL_KERNEL_PROXY */ 1425 1426 static int 1427 icl_unload(void) 1428 { 1429 1430 if (icl_ncons != 0) 1431 return (EBUSY); 1432 1433 uma_zdestroy(icl_conn_zone); 1434 uma_zdestroy(icl_pdu_zone); 1435 1436 return (0); 1437 } 1438 1439 static void 1440 icl_load(void) 1441 { 1442 1443 icl_conn_zone = uma_zcreate("icl_conn", 1444 sizeof(struct icl_conn), NULL, NULL, NULL, NULL, 1445 UMA_ALIGN_PTR, 0); 1446 icl_pdu_zone = uma_zcreate("icl_pdu", 1447 sizeof(struct icl_pdu), NULL, NULL, NULL, NULL, 1448 UMA_ALIGN_PTR, 0); 1449 1450 refcount_init(&icl_ncons, 0); 1451 } 1452 1453 static int 1454 icl_modevent(module_t mod, int what, void *arg) 1455 { 1456 1457 switch (what) { 1458 case MOD_LOAD: 1459 icl_load(); 1460 return (0); 1461 case MOD_UNLOAD: 1462 return (icl_unload()); 1463 default: 1464 return (EINVAL); 1465 } 1466 } 1467 1468 moduledata_t icl_data = { 1469 "icl", 1470 icl_modevent, 1471 0 1472 }; 1473 1474 DECLARE_MODULE(icl, icl_data, SI_SUB_DRIVERS, SI_ORDER_FIRST); 1475 MODULE_VERSION(icl, 1); 1476