icl.c revision 270888
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 */ 30 31/* 32 * iSCSI Common Layer. It's used by both the initiator and target to send 33 * and receive iSCSI PDUs. 34 */ 35 36#include <sys/cdefs.h> 37__FBSDID("$FreeBSD: stable/10/sys/dev/iscsi/icl.c 270888 2014-08-31 20:21:08Z trasz $"); 38 39#include <sys/param.h> 40#include <sys/capability.h> 41#include <sys/condvar.h> 42#include <sys/conf.h> 43#include <sys/file.h> 44#include <sys/kernel.h> 45#include <sys/kthread.h> 46#include <sys/lock.h> 47#include <sys/mbuf.h> 48#include <sys/mutex.h> 49#include <sys/module.h> 50#include <sys/protosw.h> 51#include <sys/socket.h> 52#include <sys/socketvar.h> 53#include <sys/sysctl.h> 54#include <sys/systm.h> 55#include <sys/sx.h> 56#include <sys/uio.h> 57#include <vm/uma.h> 58#include <netinet/in.h> 59#include <netinet/tcp.h> 60 61#include "icl.h" 62#include "iscsi_proto.h" 63 64SYSCTL_NODE(_kern, OID_AUTO, icl, CTLFLAG_RD, 0, "iSCSI Common Layer"); 65static int debug = 1; 66TUNABLE_INT("kern.icl.debug", &debug); 67SYSCTL_INT(_kern_icl, OID_AUTO, debug, CTLFLAG_RWTUN, 68 &debug, 0, "Enable debug messages"); 69static int coalesce = 1; 70TUNABLE_INT("kern.icl.coalesce", &coalesce); 71SYSCTL_INT(_kern_icl, OID_AUTO, coalesce, CTLFLAG_RWTUN, 72 &coalesce, 0, "Try to coalesce PDUs before sending"); 73static int partial_receive_len = 128 * 1024; 74TUNABLE_INT("kern.icl.partial_receive_len", &partial_receive_len); 75SYSCTL_INT(_kern_icl, OID_AUTO, partial_receive_len, CTLFLAG_RWTUN, 76 &partial_receive_len, 0, "Minimum read size for partially received " 77 "data segment"); 78static int sendspace = 1048576; 79TUNABLE_INT("kern.icl.sendspace", &sendspace); 80SYSCTL_INT(_kern_icl, OID_AUTO, sendspace, CTLFLAG_RWTUN, 81 &sendspace, 0, "Default send socket buffer size"); 82static int recvspace = 1048576; 83TUNABLE_INT("kern.icl.recvspace", &recvspace); 84SYSCTL_INT(_kern_icl, OID_AUTO, recvspace, CTLFLAG_RWTUN, 85 &recvspace, 0, "Default receive socket buffer size"); 86 87static uma_zone_t icl_conn_zone; 88static uma_zone_t icl_pdu_zone; 89 90static volatile u_int icl_ncons; 91 92#define ICL_DEBUG(X, ...) \ 93 do { \ 94 if (debug > 1) \ 95 printf("%s: " X "\n", __func__, ## __VA_ARGS__);\ 96 } while (0) 97 98#define ICL_WARN(X, ...) \ 99 do { \ 100 if (debug > 0) { \ 101 printf("WARNING: %s: " X "\n", \ 102 __func__, ## __VA_ARGS__); \ 103 } \ 104 } while (0) 105 106#define ICL_CONN_LOCK(X) mtx_lock(X->ic_lock) 107#define ICL_CONN_UNLOCK(X) mtx_unlock(X->ic_lock) 108#define ICL_CONN_LOCK_ASSERT(X) mtx_assert(X->ic_lock, MA_OWNED) 109#define ICL_CONN_LOCK_ASSERT_NOT(X) mtx_assert(X->ic_lock, MA_NOTOWNED) 110 111STAILQ_HEAD(icl_pdu_stailq, icl_pdu); 112 113static void 114icl_conn_fail(struct icl_conn *ic) 115{ 116 if (ic->ic_socket == NULL) 117 return; 118 119 /* 120 * XXX 121 */ 122 ic->ic_socket->so_error = EDOOFUS; 123 (ic->ic_error)(ic); 124} 125 126static struct mbuf * 127icl_conn_receive(struct icl_conn *ic, size_t len) 128{ 129 struct uio uio; 130 struct socket *so; 131 struct mbuf *m; 132 int error, flags; 133 134 so = ic->ic_socket; 135 136 memset(&uio, 0, sizeof(uio)); 137 uio.uio_resid = len; 138 139 flags = MSG_DONTWAIT; 140 error = soreceive(so, NULL, &uio, &m, NULL, &flags); 141 if (error != 0) { 142 ICL_DEBUG("soreceive error %d", error); 143 return (NULL); 144 } 145 if (uio.uio_resid != 0) { 146 m_freem(m); 147 ICL_DEBUG("short read"); 148 return (NULL); 149 } 150 151 return (m); 152} 153 154static struct icl_pdu * 155icl_pdu_new(struct icl_conn *ic, int flags) 156{ 157 struct icl_pdu *ip; 158 159#ifdef DIAGNOSTIC 160 refcount_acquire(&ic->ic_outstanding_pdus); 161#endif 162 ip = uma_zalloc(icl_pdu_zone, flags | M_ZERO); 163 if (ip == NULL) { 164 ICL_WARN("failed to allocate %zd bytes", sizeof(*ip)); 165#ifdef DIAGNOSTIC 166 refcount_release(&ic->ic_outstanding_pdus); 167#endif 168 return (NULL); 169 } 170 171 ip->ip_conn = ic; 172 173 return (ip); 174} 175 176void 177icl_pdu_free(struct icl_pdu *ip) 178{ 179 struct icl_conn *ic; 180 181 ic = ip->ip_conn; 182 183 m_freem(ip->ip_bhs_mbuf); 184 m_freem(ip->ip_ahs_mbuf); 185 m_freem(ip->ip_data_mbuf); 186 uma_zfree(icl_pdu_zone, ip); 187#ifdef DIAGNOSTIC 188 refcount_release(&ic->ic_outstanding_pdus); 189#endif 190} 191 192/* 193 * Allocate icl_pdu with empty BHS to fill up by the caller. 194 */ 195struct icl_pdu * 196icl_pdu_new_bhs(struct icl_conn *ic, int flags) 197{ 198 struct icl_pdu *ip; 199 200 ip = icl_pdu_new(ic, flags); 201 if (ip == NULL) 202 return (NULL); 203 204 ip->ip_bhs_mbuf = m_getm2(NULL, sizeof(struct iscsi_bhs), 205 flags, MT_DATA, M_PKTHDR); 206 if (ip->ip_bhs_mbuf == NULL) { 207 ICL_WARN("failed to allocate %zd bytes", sizeof(*ip)); 208 icl_pdu_free(ip); 209 return (NULL); 210 } 211 ip->ip_bhs = mtod(ip->ip_bhs_mbuf, struct iscsi_bhs *); 212 memset(ip->ip_bhs, 0, sizeof(struct iscsi_bhs)); 213 ip->ip_bhs_mbuf->m_len = sizeof(struct iscsi_bhs); 214 215 return (ip); 216} 217 218static int 219icl_pdu_ahs_length(const struct icl_pdu *request) 220{ 221 222 return (request->ip_bhs->bhs_total_ahs_len * 4); 223} 224 225size_t 226icl_pdu_data_segment_length(const struct icl_pdu *request) 227{ 228 uint32_t len = 0; 229 230 len += request->ip_bhs->bhs_data_segment_len[0]; 231 len <<= 8; 232 len += request->ip_bhs->bhs_data_segment_len[1]; 233 len <<= 8; 234 len += request->ip_bhs->bhs_data_segment_len[2]; 235 236 return (len); 237} 238 239static void 240icl_pdu_set_data_segment_length(struct icl_pdu *response, uint32_t len) 241{ 242 243 response->ip_bhs->bhs_data_segment_len[2] = len; 244 response->ip_bhs->bhs_data_segment_len[1] = len >> 8; 245 response->ip_bhs->bhs_data_segment_len[0] = len >> 16; 246} 247 248static size_t 249icl_pdu_padding(const struct icl_pdu *ip) 250{ 251 252 if ((ip->ip_data_len % 4) != 0) 253 return (4 - (ip->ip_data_len % 4)); 254 255 return (0); 256} 257 258static size_t 259icl_pdu_size(const struct icl_pdu *response) 260{ 261 size_t len; 262 263 KASSERT(response->ip_ahs_len == 0, ("responding with AHS")); 264 265 len = sizeof(struct iscsi_bhs) + response->ip_data_len + 266 icl_pdu_padding(response); 267 if (response->ip_conn->ic_header_crc32c) 268 len += ISCSI_HEADER_DIGEST_SIZE; 269 if (response->ip_data_len != 0 && response->ip_conn->ic_data_crc32c) 270 len += ISCSI_DATA_DIGEST_SIZE; 271 272 return (len); 273} 274 275static int 276icl_pdu_receive_bhs(struct icl_pdu *request, size_t *availablep) 277{ 278 struct mbuf *m; 279 280 m = icl_conn_receive(request->ip_conn, sizeof(struct iscsi_bhs)); 281 if (m == NULL) { 282 ICL_DEBUG("failed to receive BHS"); 283 return (-1); 284 } 285 286 request->ip_bhs_mbuf = m_pullup(m, sizeof(struct iscsi_bhs)); 287 if (request->ip_bhs_mbuf == NULL) { 288 ICL_WARN("m_pullup failed"); 289 return (-1); 290 } 291 request->ip_bhs = mtod(request->ip_bhs_mbuf, struct iscsi_bhs *); 292 293 /* 294 * XXX: For architectures with strict alignment requirements 295 * we may need to allocate ip_bhs and copy the data into it. 296 * For some reason, though, not doing this doesn't seem 297 * to cause problems; tested on sparc64. 298 */ 299 300 *availablep -= sizeof(struct iscsi_bhs); 301 return (0); 302} 303 304static int 305icl_pdu_receive_ahs(struct icl_pdu *request, size_t *availablep) 306{ 307 308 request->ip_ahs_len = icl_pdu_ahs_length(request); 309 if (request->ip_ahs_len == 0) 310 return (0); 311 312 request->ip_ahs_mbuf = icl_conn_receive(request->ip_conn, 313 request->ip_ahs_len); 314 if (request->ip_ahs_mbuf == NULL) { 315 ICL_DEBUG("failed to receive AHS"); 316 return (-1); 317 } 318 319 *availablep -= request->ip_ahs_len; 320 return (0); 321} 322 323static uint32_t 324icl_mbuf_to_crc32c(const struct mbuf *m0) 325{ 326 uint32_t digest = 0xffffffff; 327 const struct mbuf *m; 328 329 for (m = m0; m != NULL; m = m->m_next) 330 digest = calculate_crc32c(digest, 331 mtod(m, const void *), m->m_len); 332 333 digest = digest ^ 0xffffffff; 334 335 return (digest); 336} 337 338static int 339icl_pdu_check_header_digest(struct icl_pdu *request, size_t *availablep) 340{ 341 struct mbuf *m; 342 uint32_t received_digest, valid_digest; 343 344 if (request->ip_conn->ic_header_crc32c == false) 345 return (0); 346 347 m = icl_conn_receive(request->ip_conn, ISCSI_HEADER_DIGEST_SIZE); 348 if (m == NULL) { 349 ICL_DEBUG("failed to receive header digest"); 350 return (-1); 351 } 352 353 CTASSERT(sizeof(received_digest) == ISCSI_HEADER_DIGEST_SIZE); 354 m_copydata(m, 0, ISCSI_HEADER_DIGEST_SIZE, (void *)&received_digest); 355 m_freem(m); 356 357 *availablep -= ISCSI_HEADER_DIGEST_SIZE; 358 359 /* 360 * XXX: Handle AHS. 361 */ 362 valid_digest = icl_mbuf_to_crc32c(request->ip_bhs_mbuf); 363 if (received_digest != valid_digest) { 364 ICL_WARN("header digest check failed; got 0x%x, " 365 "should be 0x%x", received_digest, valid_digest); 366 return (-1); 367 } 368 369 return (0); 370} 371 372/* 373 * Return the number of bytes that should be waiting in the receive socket 374 * before icl_pdu_receive_data_segment() gets called. 375 */ 376static size_t 377icl_pdu_data_segment_receive_len(const struct icl_pdu *request) 378{ 379 size_t len; 380 381 len = icl_pdu_data_segment_length(request); 382 if (len == 0) 383 return (0); 384 385 /* 386 * Account for the parts of data segment already read from 387 * the socket buffer. 388 */ 389 KASSERT(len > request->ip_data_len, ("len <= request->ip_data_len")); 390 len -= request->ip_data_len; 391 392 /* 393 * Don't always wait for the full data segment to be delivered 394 * to the socket; this might badly affect performance due to 395 * TCP window scaling. 396 */ 397 if (len > partial_receive_len) { 398#if 0 399 ICL_DEBUG("need %zd bytes of data, limiting to %zd", 400 len, partial_receive_len)); 401#endif 402 len = partial_receive_len; 403 404 return (len); 405 } 406 407 /* 408 * Account for padding. Note that due to the way code is written, 409 * the icl_pdu_receive_data_segment() must always receive padding 410 * along with the last part of data segment, because it would be 411 * impossible to tell whether we've already received the full data 412 * segment including padding, or without it. 413 */ 414 if ((len % 4) != 0) 415 len += 4 - (len % 4); 416 417#if 0 418 ICL_DEBUG("need %zd bytes of data", len)); 419#endif 420 421 return (len); 422} 423 424static int 425icl_pdu_receive_data_segment(struct icl_pdu *request, 426 size_t *availablep, bool *more_neededp) 427{ 428 struct icl_conn *ic; 429 size_t len, padding = 0; 430 struct mbuf *m; 431 432 ic = request->ip_conn; 433 434 *more_neededp = false; 435 ic->ic_receive_len = 0; 436 437 len = icl_pdu_data_segment_length(request); 438 if (len == 0) 439 return (0); 440 441 if ((len % 4) != 0) 442 padding = 4 - (len % 4); 443 444 /* 445 * Account for already received parts of data segment. 446 */ 447 KASSERT(len > request->ip_data_len, ("len <= request->ip_data_len")); 448 len -= request->ip_data_len; 449 450 if (len + padding > *availablep) { 451 /* 452 * Not enough data in the socket buffer. Receive as much 453 * as we can. Don't receive padding, since, obviously, it's 454 * not the end of data segment yet. 455 */ 456#if 0 457 ICL_DEBUG("limited from %zd to %zd", 458 len + padding, *availablep - padding)); 459#endif 460 len = *availablep - padding; 461 *more_neededp = true; 462 padding = 0; 463 } 464 465 /* 466 * Must not try to receive padding without at least one byte 467 * of actual data segment. 468 */ 469 if (len > 0) { 470 m = icl_conn_receive(request->ip_conn, len + padding); 471 if (m == NULL) { 472 ICL_DEBUG("failed to receive data segment"); 473 return (-1); 474 } 475 476 if (request->ip_data_mbuf == NULL) 477 request->ip_data_mbuf = m; 478 else 479 m_cat(request->ip_data_mbuf, m); 480 481 request->ip_data_len += len; 482 *availablep -= len + padding; 483 } else 484 ICL_DEBUG("len 0"); 485 486 if (*more_neededp) 487 ic->ic_receive_len = 488 icl_pdu_data_segment_receive_len(request); 489 490 return (0); 491} 492 493static int 494icl_pdu_check_data_digest(struct icl_pdu *request, size_t *availablep) 495{ 496 struct mbuf *m; 497 uint32_t received_digest, valid_digest; 498 499 if (request->ip_conn->ic_data_crc32c == false) 500 return (0); 501 502 if (request->ip_data_len == 0) 503 return (0); 504 505 m = icl_conn_receive(request->ip_conn, ISCSI_DATA_DIGEST_SIZE); 506 if (m == NULL) { 507 ICL_DEBUG("failed to receive data digest"); 508 return (-1); 509 } 510 511 CTASSERT(sizeof(received_digest) == ISCSI_DATA_DIGEST_SIZE); 512 m_copydata(m, 0, ISCSI_DATA_DIGEST_SIZE, (void *)&received_digest); 513 m_freem(m); 514 515 *availablep -= ISCSI_DATA_DIGEST_SIZE; 516 517 /* 518 * Note that ip_data_mbuf also contains padding; since digest 519 * calculation is supposed to include that, we iterate over 520 * the entire ip_data_mbuf chain, not just ip_data_len bytes of it. 521 */ 522 valid_digest = icl_mbuf_to_crc32c(request->ip_data_mbuf); 523 if (received_digest != valid_digest) { 524 ICL_WARN("data digest check failed; got 0x%x, " 525 "should be 0x%x", received_digest, valid_digest); 526 return (-1); 527 } 528 529 return (0); 530} 531 532/* 533 * Somewhat contrary to the name, this attempts to receive only one 534 * "part" of PDU at a time; call it repeatedly until it returns non-NULL. 535 */ 536static struct icl_pdu * 537icl_conn_receive_pdu(struct icl_conn *ic, size_t *availablep) 538{ 539 struct icl_pdu *request; 540 struct socket *so; 541 size_t len; 542 int error; 543 bool more_needed; 544 545 so = ic->ic_socket; 546 547 if (ic->ic_receive_state == ICL_CONN_STATE_BHS) { 548 KASSERT(ic->ic_receive_pdu == NULL, 549 ("ic->ic_receive_pdu != NULL")); 550 request = icl_pdu_new(ic, M_NOWAIT); 551 if (request == NULL) { 552 ICL_DEBUG("failed to allocate PDU; " 553 "dropping connection"); 554 icl_conn_fail(ic); 555 return (NULL); 556 } 557 ic->ic_receive_pdu = request; 558 } else { 559 KASSERT(ic->ic_receive_pdu != NULL, 560 ("ic->ic_receive_pdu == NULL")); 561 request = ic->ic_receive_pdu; 562 } 563 564 if (*availablep < ic->ic_receive_len) { 565#if 0 566 ICL_DEBUG("not enough data; need %zd, " 567 "have %zd", ic->ic_receive_len, *availablep); 568#endif 569 return (NULL); 570 } 571 572 switch (ic->ic_receive_state) { 573 case ICL_CONN_STATE_BHS: 574 //ICL_DEBUG("receiving BHS"); 575 error = icl_pdu_receive_bhs(request, availablep); 576 if (error != 0) { 577 ICL_DEBUG("failed to receive BHS; " 578 "dropping connection"); 579 break; 580 } 581 582 /* 583 * We don't enforce any limit for AHS length; 584 * its length is stored in 8 bit field. 585 */ 586 587 len = icl_pdu_data_segment_length(request); 588 if (len > ic->ic_max_data_segment_length) { 589 ICL_WARN("received data segment " 590 "length %zd is larger than negotiated " 591 "MaxDataSegmentLength %zd; " 592 "dropping connection", 593 len, ic->ic_max_data_segment_length); 594 error = EINVAL; 595 break; 596 } 597 598 ic->ic_receive_state = ICL_CONN_STATE_AHS; 599 ic->ic_receive_len = icl_pdu_ahs_length(request); 600 break; 601 602 case ICL_CONN_STATE_AHS: 603 //ICL_DEBUG("receiving AHS"); 604 error = icl_pdu_receive_ahs(request, availablep); 605 if (error != 0) { 606 ICL_DEBUG("failed to receive AHS; " 607 "dropping connection"); 608 break; 609 } 610 ic->ic_receive_state = ICL_CONN_STATE_HEADER_DIGEST; 611 if (ic->ic_header_crc32c == false) 612 ic->ic_receive_len = 0; 613 else 614 ic->ic_receive_len = ISCSI_HEADER_DIGEST_SIZE; 615 break; 616 617 case ICL_CONN_STATE_HEADER_DIGEST: 618 //ICL_DEBUG("receiving header digest"); 619 error = icl_pdu_check_header_digest(request, availablep); 620 if (error != 0) { 621 ICL_DEBUG("header digest failed; " 622 "dropping connection"); 623 break; 624 } 625 626 ic->ic_receive_state = ICL_CONN_STATE_DATA; 627 ic->ic_receive_len = 628 icl_pdu_data_segment_receive_len(request); 629 break; 630 631 case ICL_CONN_STATE_DATA: 632 //ICL_DEBUG("receiving data segment"); 633 error = icl_pdu_receive_data_segment(request, availablep, 634 &more_needed); 635 if (error != 0) { 636 ICL_DEBUG("failed to receive data segment;" 637 "dropping connection"); 638 break; 639 } 640 641 if (more_needed) 642 break; 643 644 ic->ic_receive_state = ICL_CONN_STATE_DATA_DIGEST; 645 if (request->ip_data_len == 0 || ic->ic_data_crc32c == false) 646 ic->ic_receive_len = 0; 647 else 648 ic->ic_receive_len = ISCSI_DATA_DIGEST_SIZE; 649 break; 650 651 case ICL_CONN_STATE_DATA_DIGEST: 652 //ICL_DEBUG("receiving data digest"); 653 error = icl_pdu_check_data_digest(request, availablep); 654 if (error != 0) { 655 ICL_DEBUG("data digest failed; " 656 "dropping connection"); 657 break; 658 } 659 660 /* 661 * We've received complete PDU; reset the receive state machine 662 * and return the PDU. 663 */ 664 ic->ic_receive_state = ICL_CONN_STATE_BHS; 665 ic->ic_receive_len = sizeof(struct iscsi_bhs); 666 ic->ic_receive_pdu = NULL; 667 return (request); 668 669 default: 670 panic("invalid ic_receive_state %d\n", ic->ic_receive_state); 671 } 672 673 if (error != 0) { 674 /* 675 * Don't free the PDU; it's pointed to by ic->ic_receive_pdu 676 * and will get freed in icl_conn_close(). 677 */ 678 icl_conn_fail(ic); 679 } 680 681 return (NULL); 682} 683 684static void 685icl_conn_receive_pdus(struct icl_conn *ic, size_t available) 686{ 687 struct icl_pdu *response; 688 struct socket *so; 689 690 so = ic->ic_socket; 691 692 /* 693 * This can never happen; we're careful to only mess with ic->ic_socket 694 * pointer when the send/receive threads are not running. 695 */ 696 KASSERT(so != NULL, ("NULL socket")); 697 698 for (;;) { 699 if (ic->ic_disconnecting) 700 return; 701 702 if (so->so_error != 0) { 703 ICL_DEBUG("connection error %d; " 704 "dropping connection", so->so_error); 705 icl_conn_fail(ic); 706 return; 707 } 708 709 /* 710 * Loop until we have a complete PDU or there is not enough 711 * data in the socket buffer. 712 */ 713 if (available < ic->ic_receive_len) { 714#if 0 715 ICL_DEBUG("not enough data; have %zd, " 716 "need %zd", available, 717 ic->ic_receive_len); 718#endif 719 return; 720 } 721 722 response = icl_conn_receive_pdu(ic, &available); 723 if (response == NULL) 724 continue; 725 726 if (response->ip_ahs_len > 0) { 727 ICL_WARN("received PDU with unsupported " 728 "AHS; opcode 0x%x; dropping connection", 729 response->ip_bhs->bhs_opcode); 730 icl_pdu_free(response); 731 icl_conn_fail(ic); 732 return; 733 } 734 735 (ic->ic_receive)(response); 736 } 737} 738 739static void 740icl_receive_thread(void *arg) 741{ 742 struct icl_conn *ic; 743 size_t available; 744 struct socket *so; 745 746 ic = arg; 747 so = ic->ic_socket; 748 749 ICL_CONN_LOCK(ic); 750 ic->ic_receive_running = true; 751 ICL_CONN_UNLOCK(ic); 752 753 for (;;) { 754 if (ic->ic_disconnecting) { 755 //ICL_DEBUG("terminating"); 756 break; 757 } 758 759 /* 760 * Set the low watermark, to be checked by 761 * soreadable() in icl_soupcall_receive() 762 * to avoid unneccessary wakeups until there 763 * is enough data received to read the PDU. 764 */ 765 SOCKBUF_LOCK(&so->so_rcv); 766 available = so->so_rcv.sb_cc; 767 if (available < ic->ic_receive_len) { 768 so->so_rcv.sb_lowat = ic->ic_receive_len; 769 cv_wait(&ic->ic_receive_cv, &so->so_rcv.sb_mtx); 770 } else 771 so->so_rcv.sb_lowat = so->so_rcv.sb_hiwat + 1; 772 SOCKBUF_UNLOCK(&so->so_rcv); 773 774 icl_conn_receive_pdus(ic, available); 775 } 776 777 ICL_CONN_LOCK(ic); 778 ic->ic_receive_running = false; 779 ICL_CONN_UNLOCK(ic); 780 kthread_exit(); 781} 782 783static int 784icl_soupcall_receive(struct socket *so, void *arg, int waitflag) 785{ 786 struct icl_conn *ic; 787 788 if (!soreadable(so)) 789 return (SU_OK); 790 791 ic = arg; 792 cv_signal(&ic->ic_receive_cv); 793 return (SU_OK); 794} 795 796static int 797icl_pdu_finalize(struct icl_pdu *request) 798{ 799 size_t padding, pdu_len; 800 uint32_t digest, zero = 0; 801 int ok; 802 struct icl_conn *ic; 803 804 ic = request->ip_conn; 805 806 icl_pdu_set_data_segment_length(request, request->ip_data_len); 807 808 pdu_len = icl_pdu_size(request); 809 810 if (ic->ic_header_crc32c) { 811 digest = icl_mbuf_to_crc32c(request->ip_bhs_mbuf); 812 ok = m_append(request->ip_bhs_mbuf, sizeof(digest), 813 (void *)&digest); 814 if (ok != 1) { 815 ICL_WARN("failed to append header digest"); 816 return (1); 817 } 818 } 819 820 if (request->ip_data_len != 0) { 821 padding = icl_pdu_padding(request); 822 if (padding > 0) { 823 ok = m_append(request->ip_data_mbuf, padding, 824 (void *)&zero); 825 if (ok != 1) { 826 ICL_WARN("failed to append padding"); 827 return (1); 828 } 829 } 830 831 if (ic->ic_data_crc32c) { 832 digest = icl_mbuf_to_crc32c(request->ip_data_mbuf); 833 834 ok = m_append(request->ip_data_mbuf, sizeof(digest), 835 (void *)&digest); 836 if (ok != 1) { 837 ICL_WARN("failed to append data digest"); 838 return (1); 839 } 840 } 841 842 m_cat(request->ip_bhs_mbuf, request->ip_data_mbuf); 843 request->ip_data_mbuf = NULL; 844 } 845 846 request->ip_bhs_mbuf->m_pkthdr.len = pdu_len; 847 848 return (0); 849} 850 851static void 852icl_conn_send_pdus(struct icl_conn *ic, struct icl_pdu_stailq *queue) 853{ 854 struct icl_pdu *request, *request2; 855 struct socket *so; 856 size_t available, size, size2; 857 int coalesced, error; 858 859 ICL_CONN_LOCK_ASSERT_NOT(ic); 860 861 so = ic->ic_socket; 862 863 SOCKBUF_LOCK(&so->so_snd); 864 /* 865 * Check how much space do we have for transmit. We can't just 866 * call sosend() and retry when we get EWOULDBLOCK or EMSGSIZE, 867 * as it always frees the mbuf chain passed to it, even in case 868 * of error. 869 */ 870 available = sbspace(&so->so_snd); 871 872 /* 873 * Notify the socket upcall that we don't need wakeups 874 * for the time being. 875 */ 876 so->so_snd.sb_lowat = so->so_snd.sb_hiwat + 1; 877 SOCKBUF_UNLOCK(&so->so_snd); 878 879 while (!STAILQ_EMPTY(queue)) { 880 if (ic->ic_disconnecting) 881 return; 882 request = STAILQ_FIRST(queue); 883 size = icl_pdu_size(request); 884 if (available < size) { 885 886 /* 887 * Set the low watermark, to be checked by 888 * sowriteable() 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 available = sbspace(&so->so_snd); 894 if (available < size) { 895#if 1 896 ICL_DEBUG("no space to send; " 897 "have %zd, need %zd", 898 available, size); 899#endif 900 so->so_snd.sb_lowat = size; 901 SOCKBUF_UNLOCK(&so->so_snd); 902 return; 903 } 904 SOCKBUF_UNLOCK(&so->so_snd); 905 } 906 STAILQ_REMOVE_HEAD(queue, ip_next); 907 error = icl_pdu_finalize(request); 908 if (error != 0) { 909 ICL_DEBUG("failed to finalize PDU; " 910 "dropping connection"); 911 icl_conn_fail(ic); 912 icl_pdu_free(request); 913 return; 914 } 915 if (coalesce) { 916 coalesced = 1; 917 for (;;) { 918 request2 = STAILQ_FIRST(queue); 919 if (request2 == NULL) 920 break; 921 size2 = icl_pdu_size(request2); 922 if (available < size + size2) 923 break; 924 STAILQ_REMOVE_HEAD(queue, ip_next); 925 error = icl_pdu_finalize(request2); 926 if (error != 0) { 927 ICL_DEBUG("failed to finalize PDU; " 928 "dropping connection"); 929 icl_conn_fail(ic); 930 icl_pdu_free(request); 931 icl_pdu_free(request2); 932 return; 933 } 934 m_cat(request->ip_bhs_mbuf, request2->ip_bhs_mbuf); 935 request2->ip_bhs_mbuf = NULL; 936 request->ip_bhs_mbuf->m_pkthdr.len += size2; 937 size += size2; 938 STAILQ_REMOVE_AFTER(queue, request, ip_next); 939 icl_pdu_free(request2); 940 coalesced++; 941 } 942#if 0 943 if (coalesced > 1) { 944 ICL_DEBUG("coalesced %d PDUs into %zd bytes", 945 coalesced, size); 946 } 947#endif 948 } 949 available -= size; 950 error = sosend(so, NULL, NULL, request->ip_bhs_mbuf, 951 NULL, MSG_DONTWAIT, curthread); 952 request->ip_bhs_mbuf = NULL; /* Sosend consumes the mbuf. */ 953 if (error != 0) { 954 ICL_DEBUG("failed to send PDU, error %d; " 955 "dropping connection", error); 956 icl_conn_fail(ic); 957 icl_pdu_free(request); 958 return; 959 } 960 icl_pdu_free(request); 961 } 962} 963 964static void 965icl_send_thread(void *arg) 966{ 967 struct icl_conn *ic; 968 struct icl_pdu_stailq queue; 969 970 ic = arg; 971 972 STAILQ_INIT(&queue); 973 974 ICL_CONN_LOCK(ic); 975 ic->ic_send_running = true; 976 977 for (;;) { 978 if (ic->ic_disconnecting) { 979 //ICL_DEBUG("terminating"); 980 break; 981 } 982 983 for (;;) { 984 /* 985 * If the local queue is empty, populate it from 986 * the main one. This way the icl_conn_send_pdus() 987 * can go through all the queued PDUs without holding 988 * any locks. 989 */ 990 if (STAILQ_EMPTY(&queue)) 991 STAILQ_SWAP(&ic->ic_to_send, &queue, icl_pdu); 992 993 ic->ic_check_send_space = false; 994 ICL_CONN_UNLOCK(ic); 995 icl_conn_send_pdus(ic, &queue); 996 ICL_CONN_LOCK(ic); 997 998 /* 999 * The icl_soupcall_send() was called since the last 1000 * call to sbspace(); go around; 1001 */ 1002 if (ic->ic_check_send_space) 1003 continue; 1004 1005 /* 1006 * Local queue is empty, but we still have PDUs 1007 * in the main one; go around. 1008 */ 1009 if (STAILQ_EMPTY(&queue) && 1010 !STAILQ_EMPTY(&ic->ic_to_send)) 1011 continue; 1012 1013 /* 1014 * There might be some stuff in the local queue, 1015 * which didn't get sent due to not having enough send 1016 * space. Wait for socket upcall. 1017 */ 1018 break; 1019 } 1020 1021 cv_wait(&ic->ic_send_cv, ic->ic_lock); 1022 } 1023 1024 /* 1025 * We're exiting; move PDUs back to the main queue, so they can 1026 * get freed properly. At this point ordering doesn't matter. 1027 */ 1028 STAILQ_CONCAT(&ic->ic_to_send, &queue); 1029 1030 ic->ic_send_running = false; 1031 ICL_CONN_UNLOCK(ic); 1032 kthread_exit(); 1033} 1034 1035static int 1036icl_soupcall_send(struct socket *so, void *arg, int waitflag) 1037{ 1038 struct icl_conn *ic; 1039 1040 if (!sowriteable(so)) 1041 return (SU_OK); 1042 1043 ic = arg; 1044 1045 ICL_CONN_LOCK(ic); 1046 ic->ic_check_send_space = true; 1047 ICL_CONN_UNLOCK(ic); 1048 1049 cv_signal(&ic->ic_send_cv); 1050 1051 return (SU_OK); 1052} 1053 1054int 1055icl_pdu_append_data(struct icl_pdu *request, const void *addr, size_t len, 1056 int flags) 1057{ 1058 struct mbuf *mb, *newmb; 1059 size_t copylen, off = 0; 1060 1061 KASSERT(len > 0, ("len == 0")); 1062 1063 newmb = m_getm2(NULL, len, flags, MT_DATA, M_PKTHDR); 1064 if (newmb == NULL) { 1065 ICL_WARN("failed to allocate mbuf for %zd bytes", len); 1066 return (ENOMEM); 1067 } 1068 1069 for (mb = newmb; mb != NULL; mb = mb->m_next) { 1070 copylen = min(M_TRAILINGSPACE(mb), len - off); 1071 memcpy(mtod(mb, char *), (const char *)addr + off, copylen); 1072 mb->m_len = copylen; 1073 off += copylen; 1074 } 1075 KASSERT(off == len, ("%s: off != len", __func__)); 1076 1077 if (request->ip_data_mbuf == NULL) { 1078 request->ip_data_mbuf = newmb; 1079 request->ip_data_len = len; 1080 } else { 1081 m_cat(request->ip_data_mbuf, newmb); 1082 request->ip_data_len += len; 1083 } 1084 1085 return (0); 1086} 1087 1088void 1089icl_pdu_get_data(struct icl_pdu *ip, size_t off, void *addr, size_t len) 1090{ 1091 1092 m_copydata(ip->ip_data_mbuf, off, len, addr); 1093} 1094 1095void 1096icl_pdu_queue(struct icl_pdu *ip) 1097{ 1098 struct icl_conn *ic; 1099 1100 ic = ip->ip_conn; 1101 1102 ICL_CONN_LOCK_ASSERT(ic); 1103 1104 if (ic->ic_disconnecting || ic->ic_socket == NULL) { 1105 ICL_DEBUG("icl_pdu_queue on closed connection"); 1106 icl_pdu_free(ip); 1107 return; 1108 } 1109 1110 if (!STAILQ_EMPTY(&ic->ic_to_send)) { 1111 STAILQ_INSERT_TAIL(&ic->ic_to_send, ip, ip_next); 1112 /* 1113 * If the queue is not empty, someone else had already 1114 * signaled the send thread; no need to do that again, 1115 * just return. 1116 */ 1117 return; 1118 } 1119 1120 STAILQ_INSERT_TAIL(&ic->ic_to_send, ip, ip_next); 1121 cv_signal(&ic->ic_send_cv); 1122} 1123 1124struct icl_conn * 1125icl_conn_new(const char *name, struct mtx *lock) 1126{ 1127 struct icl_conn *ic; 1128 1129 refcount_acquire(&icl_ncons); 1130 1131 ic = uma_zalloc(icl_conn_zone, M_WAITOK | M_ZERO); 1132 1133 STAILQ_INIT(&ic->ic_to_send); 1134 ic->ic_lock = lock; 1135 cv_init(&ic->ic_send_cv, "icl_tx"); 1136 cv_init(&ic->ic_receive_cv, "icl_rx"); 1137#ifdef DIAGNOSTIC 1138 refcount_init(&ic->ic_outstanding_pdus, 0); 1139#endif 1140 ic->ic_max_data_segment_length = ICL_MAX_DATA_SEGMENT_LENGTH; 1141 ic->ic_name = name; 1142 1143 return (ic); 1144} 1145 1146void 1147icl_conn_free(struct icl_conn *ic) 1148{ 1149 1150 cv_destroy(&ic->ic_send_cv); 1151 cv_destroy(&ic->ic_receive_cv); 1152 uma_zfree(icl_conn_zone, ic); 1153 refcount_release(&icl_ncons); 1154} 1155 1156static int 1157icl_conn_start(struct icl_conn *ic) 1158{ 1159 size_t minspace; 1160 struct sockopt opt; 1161 int error, one = 1; 1162 1163 ICL_CONN_LOCK(ic); 1164 1165 /* 1166 * XXX: Ugly hack. 1167 */ 1168 if (ic->ic_socket == NULL) { 1169 ICL_CONN_UNLOCK(ic); 1170 return (EINVAL); 1171 } 1172 1173 ic->ic_receive_state = ICL_CONN_STATE_BHS; 1174 ic->ic_receive_len = sizeof(struct iscsi_bhs); 1175 ic->ic_disconnecting = false; 1176 1177 ICL_CONN_UNLOCK(ic); 1178 1179 /* 1180 * For sendspace, this is required because the current code cannot 1181 * send a PDU in pieces; thus, the minimum buffer size is equal 1182 * to the maximum PDU size. "+4" is to account for possible padding. 1183 * 1184 * What we should actually do here is to use autoscaling, but set 1185 * some minimal buffer size to "minspace". I don't know a way to do 1186 * that, though. 1187 */ 1188 minspace = sizeof(struct iscsi_bhs) + ic->ic_max_data_segment_length + 1189 ISCSI_HEADER_DIGEST_SIZE + ISCSI_DATA_DIGEST_SIZE + 4; 1190 if (sendspace < minspace) { 1191 ICL_WARN("kern.icl.sendspace too low; must be at least %zd", 1192 minspace); 1193 sendspace = minspace; 1194 } 1195 if (recvspace < minspace) { 1196 ICL_WARN("kern.icl.recvspace too low; must be at least %zd", 1197 minspace); 1198 recvspace = minspace; 1199 } 1200 1201 error = soreserve(ic->ic_socket, sendspace, recvspace); 1202 if (error != 0) { 1203 ICL_WARN("soreserve failed with error %d", error); 1204 icl_conn_close(ic); 1205 return (error); 1206 } 1207 1208 /* 1209 * Disable Nagle. 1210 */ 1211 bzero(&opt, sizeof(opt)); 1212 opt.sopt_dir = SOPT_SET; 1213 opt.sopt_level = IPPROTO_TCP; 1214 opt.sopt_name = TCP_NODELAY; 1215 opt.sopt_val = &one; 1216 opt.sopt_valsize = sizeof(one); 1217 error = sosetopt(ic->ic_socket, &opt); 1218 if (error != 0) { 1219 ICL_WARN("disabling TCP_NODELAY failed with error %d", error); 1220 icl_conn_close(ic); 1221 return (error); 1222 } 1223 1224 /* 1225 * Start threads. 1226 */ 1227 error = kthread_add(icl_send_thread, ic, NULL, NULL, 0, 0, "%stx", 1228 ic->ic_name); 1229 if (error != 0) { 1230 ICL_WARN("kthread_add(9) failed with error %d", error); 1231 icl_conn_close(ic); 1232 return (error); 1233 } 1234 1235 error = kthread_add(icl_receive_thread, ic, NULL, NULL, 0, 0, "%srx", 1236 ic->ic_name); 1237 if (error != 0) { 1238 ICL_WARN("kthread_add(9) failed with error %d", error); 1239 icl_conn_close(ic); 1240 return (error); 1241 } 1242 1243 /* 1244 * Register socket upcall, to get notified about incoming PDUs 1245 * and free space to send outgoing ones. 1246 */ 1247 SOCKBUF_LOCK(&ic->ic_socket->so_snd); 1248 soupcall_set(ic->ic_socket, SO_SND, icl_soupcall_send, ic); 1249 SOCKBUF_UNLOCK(&ic->ic_socket->so_snd); 1250 SOCKBUF_LOCK(&ic->ic_socket->so_rcv); 1251 soupcall_set(ic->ic_socket, SO_RCV, icl_soupcall_receive, ic); 1252 SOCKBUF_UNLOCK(&ic->ic_socket->so_rcv); 1253 1254 return (0); 1255} 1256 1257int 1258icl_conn_handoff(struct icl_conn *ic, int fd) 1259{ 1260 struct file *fp; 1261 struct socket *so; 1262 cap_rights_t rights; 1263 int error; 1264 1265 ICL_CONN_LOCK_ASSERT_NOT(ic); 1266 1267 /* 1268 * Steal the socket from userland. 1269 */ 1270 error = fget(curthread, fd, 1271 cap_rights_init(&rights, CAP_SOCK_CLIENT), &fp); 1272 if (error != 0) 1273 return (error); 1274 if (fp->f_type != DTYPE_SOCKET) { 1275 fdrop(fp, curthread); 1276 return (EINVAL); 1277 } 1278 so = fp->f_data; 1279 if (so->so_type != SOCK_STREAM) { 1280 fdrop(fp, curthread); 1281 return (EINVAL); 1282 } 1283 1284 ICL_CONN_LOCK(ic); 1285 1286 if (ic->ic_socket != NULL) { 1287 ICL_CONN_UNLOCK(ic); 1288 fdrop(fp, curthread); 1289 return (EBUSY); 1290 } 1291 1292 ic->ic_socket = fp->f_data; 1293 fp->f_ops = &badfileops; 1294 fp->f_data = NULL; 1295 fdrop(fp, curthread); 1296 ICL_CONN_UNLOCK(ic); 1297 1298 error = icl_conn_start(ic); 1299 1300 return (error); 1301} 1302 1303void 1304icl_conn_shutdown(struct icl_conn *ic) 1305{ 1306 ICL_CONN_LOCK_ASSERT_NOT(ic); 1307 1308 ICL_CONN_LOCK(ic); 1309 if (ic->ic_socket == NULL) { 1310 ICL_CONN_UNLOCK(ic); 1311 return; 1312 } 1313 ICL_CONN_UNLOCK(ic); 1314 1315 soshutdown(ic->ic_socket, SHUT_RDWR); 1316} 1317 1318void 1319icl_conn_close(struct icl_conn *ic) 1320{ 1321 struct icl_pdu *pdu; 1322 1323 ICL_CONN_LOCK_ASSERT_NOT(ic); 1324 1325 ICL_CONN_LOCK(ic); 1326 if (ic->ic_socket == NULL) { 1327 ICL_CONN_UNLOCK(ic); 1328 return; 1329 } 1330 1331 /* 1332 * Deregister socket upcalls. 1333 */ 1334 ICL_CONN_UNLOCK(ic); 1335 SOCKBUF_LOCK(&ic->ic_socket->so_snd); 1336 if (ic->ic_socket->so_snd.sb_upcall != NULL) 1337 soupcall_clear(ic->ic_socket, SO_SND); 1338 SOCKBUF_UNLOCK(&ic->ic_socket->so_snd); 1339 SOCKBUF_LOCK(&ic->ic_socket->so_rcv); 1340 if (ic->ic_socket->so_rcv.sb_upcall != NULL) 1341 soupcall_clear(ic->ic_socket, SO_RCV); 1342 SOCKBUF_UNLOCK(&ic->ic_socket->so_rcv); 1343 ICL_CONN_LOCK(ic); 1344 1345 ic->ic_disconnecting = true; 1346 1347 /* 1348 * Wake up the threads, so they can properly terminate. 1349 */ 1350 cv_signal(&ic->ic_receive_cv); 1351 cv_signal(&ic->ic_send_cv); 1352 while (ic->ic_receive_running || ic->ic_send_running) { 1353 //ICL_DEBUG("waiting for send/receive threads to terminate"); 1354 ICL_CONN_UNLOCK(ic); 1355 cv_signal(&ic->ic_receive_cv); 1356 cv_signal(&ic->ic_send_cv); 1357 pause("icl_close", 1 * hz); 1358 ICL_CONN_LOCK(ic); 1359 } 1360 //ICL_DEBUG("send/receive threads terminated"); 1361 1362 ICL_CONN_UNLOCK(ic); 1363 soclose(ic->ic_socket); 1364 ICL_CONN_LOCK(ic); 1365 ic->ic_socket = NULL; 1366 1367 if (ic->ic_receive_pdu != NULL) { 1368 //ICL_DEBUG("freeing partially received PDU"); 1369 icl_pdu_free(ic->ic_receive_pdu); 1370 ic->ic_receive_pdu = NULL; 1371 } 1372 1373 /* 1374 * Remove any outstanding PDUs from the send queue. 1375 */ 1376 while (!STAILQ_EMPTY(&ic->ic_to_send)) { 1377 pdu = STAILQ_FIRST(&ic->ic_to_send); 1378 STAILQ_REMOVE_HEAD(&ic->ic_to_send, ip_next); 1379 icl_pdu_free(pdu); 1380 } 1381 1382 KASSERT(STAILQ_EMPTY(&ic->ic_to_send), 1383 ("destroying session with non-empty send queue")); 1384#ifdef DIAGNOSTIC 1385 KASSERT(ic->ic_outstanding_pdus == 0, 1386 ("destroying session with %d outstanding PDUs", 1387 ic->ic_outstanding_pdus)); 1388#endif 1389 ICL_CONN_UNLOCK(ic); 1390} 1391 1392bool 1393icl_conn_connected(struct icl_conn *ic) 1394{ 1395 ICL_CONN_LOCK_ASSERT_NOT(ic); 1396 1397 ICL_CONN_LOCK(ic); 1398 if (ic->ic_socket == NULL) { 1399 ICL_CONN_UNLOCK(ic); 1400 return (false); 1401 } 1402 if (ic->ic_socket->so_error != 0) { 1403 ICL_CONN_UNLOCK(ic); 1404 return (false); 1405 } 1406 ICL_CONN_UNLOCK(ic); 1407 return (true); 1408} 1409 1410#ifdef ICL_KERNEL_PROXY 1411int 1412icl_conn_handoff_sock(struct icl_conn *ic, struct socket *so) 1413{ 1414 int error; 1415 1416 ICL_CONN_LOCK_ASSERT_NOT(ic); 1417 1418 if (so->so_type != SOCK_STREAM) 1419 return (EINVAL); 1420 1421 ICL_CONN_LOCK(ic); 1422 if (ic->ic_socket != NULL) { 1423 ICL_CONN_UNLOCK(ic); 1424 return (EBUSY); 1425 } 1426 ic->ic_socket = so; 1427 ICL_CONN_UNLOCK(ic); 1428 1429 error = icl_conn_start(ic); 1430 1431 return (error); 1432} 1433#endif /* ICL_KERNEL_PROXY */ 1434 1435static int 1436icl_unload(void) 1437{ 1438 1439 if (icl_ncons != 0) 1440 return (EBUSY); 1441 1442 uma_zdestroy(icl_conn_zone); 1443 uma_zdestroy(icl_pdu_zone); 1444 1445 return (0); 1446} 1447 1448static void 1449icl_load(void) 1450{ 1451 1452 icl_conn_zone = uma_zcreate("icl_conn", 1453 sizeof(struct icl_conn), NULL, NULL, NULL, NULL, 1454 UMA_ALIGN_PTR, 0); 1455 icl_pdu_zone = uma_zcreate("icl_pdu", 1456 sizeof(struct icl_pdu), NULL, NULL, NULL, NULL, 1457 UMA_ALIGN_PTR, 0); 1458 1459 refcount_init(&icl_ncons, 0); 1460} 1461 1462static int 1463icl_modevent(module_t mod, int what, void *arg) 1464{ 1465 1466 switch (what) { 1467 case MOD_LOAD: 1468 icl_load(); 1469 return (0); 1470 case MOD_UNLOAD: 1471 return (icl_unload()); 1472 default: 1473 return (EINVAL); 1474 } 1475} 1476 1477moduledata_t icl_data = { 1478 "icl", 1479 icl_modevent, 1480 0 1481}; 1482 1483DECLARE_MODULE(icl, icl_data, SI_SUB_DRIVERS, SI_ORDER_FIRST); 1484MODULE_VERSION(icl, 1); 1485