1/* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License (the "License"). 6 * You may not use this file except in compliance with the License. 7 * 8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9 * or http://www.opensolaris.org/os/licensing. 10 * See the License for the specific language governing permissions 11 * and limitations under the License. 12 * 13 * When distributing Covered Code, include this CDDL HEADER in each 14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15 * If applicable, add the following below this CDDL HEADER, with the 16 * fields enclosed by brackets "[]" replaced with your own identifying 17 * information: Portions Copyright [yyyy] [name of copyright owner] 18 * 19 * CDDL HEADER END 20 */ 21 22/* 23 * Copyright 2010 Sun Microsystems, Inc. All rights reserved. 24 * Use is subject to license terms. 25 */ 26 27/* 28 * Xen network backend - mac client edition. 29 * 30 * A driver that sits above an existing GLDv3/Nemo MAC driver and 31 * relays packets to/from that driver from/to a guest domain. 32 */ 33 34#ifdef DEBUG 35#define XNBO_DEBUG 1 36#endif /* DEBUG */ 37 38#include "xnb.h" 39 40#include <sys/sunddi.h> 41#include <sys/ddi.h> 42#include <sys/modctl.h> 43#include <sys/strsubr.h> 44#include <sys/mac_client.h> 45#include <sys/mac_provider.h> 46#include <sys/mac_client_priv.h> 47#include <sys/mac.h> 48#include <net/if.h> 49#include <sys/dlpi.h> 50#include <sys/pattr.h> 51#include <xen/sys/xenbus_impl.h> 52#include <xen/sys/xendev.h> 53#include <sys/sdt.h> 54#include <sys/note.h> 55 56#ifdef XNBO_DEBUG 57boolean_t xnbo_cksum_offload_to_peer = B_TRUE; 58boolean_t xnbo_cksum_offload_from_peer = B_TRUE; 59#endif /* XNBO_DEBUG */ 60 61/* Track multicast addresses. */ 62typedef struct xmca { 63 struct xmca *next; 64 ether_addr_t addr; 65} xmca_t; 66 67/* State about this device instance. */ 68typedef struct xnbo { 69 mac_handle_t o_mh; 70 mac_client_handle_t o_mch; 71 mac_unicast_handle_t o_mah; 72 mac_promisc_handle_t o_mphp; 73 boolean_t o_running; 74 boolean_t o_promiscuous; 75 uint32_t o_hcksum_capab; 76 xmca_t *o_mca; 77 char o_link_name[LIFNAMSIZ]; 78 boolean_t o_need_rx_filter; 79 boolean_t o_need_setphysaddr; 80 boolean_t o_multicast_control; 81} xnbo_t; 82 83static void xnbo_close_mac(xnb_t *); 84static void i_xnbo_close_mac(xnb_t *, boolean_t); 85 86/* 87 * Packets from the peer come here. We pass them to the mac device. 88 */ 89static void 90xnbo_to_mac(xnb_t *xnbp, mblk_t *mp) 91{ 92 xnbo_t *xnbop = xnbp->xnb_flavour_data; 93 94 ASSERT(mp != NULL); 95 96 if (!xnbop->o_running) { 97 xnbp->xnb_stat_tx_too_early++; 98 goto fail; 99 } 100 101 if (mac_tx(xnbop->o_mch, mp, 0, 102 MAC_DROP_ON_NO_DESC, NULL) != NULL) { 103 xnbp->xnb_stat_mac_full++; 104 } 105 106 return; 107 108fail: 109 freemsgchain(mp); 110} 111 112/* 113 * Process the checksum flags `flags' provided by the peer for the 114 * packet `mp'. 115 */ 116static mblk_t * 117xnbo_cksum_from_peer(xnb_t *xnbp, mblk_t *mp, uint16_t flags) 118{ 119 xnbo_t *xnbop = xnbp->xnb_flavour_data; 120 121 ASSERT(mp->b_next == NULL); 122 123 if ((flags & NETTXF_csum_blank) != 0) { 124 uint32_t capab = xnbop->o_hcksum_capab; 125 126#ifdef XNBO_DEBUG 127 if (!xnbo_cksum_offload_from_peer) 128 capab = 0; 129#endif /* XNBO_DEBUG */ 130 131 /* 132 * The checksum in the packet is blank. Determine 133 * whether we can do hardware offload and, if so, 134 * update the flags on the mblk according. If not, 135 * calculate and insert the checksum using software. 136 */ 137 mp = xnb_process_cksum_flags(xnbp, mp, capab); 138 } 139 140 return (mp); 141} 142 143/* 144 * Calculate the checksum flags to be relayed to the peer for the 145 * packet `mp'. 146 */ 147static uint16_t 148xnbo_cksum_to_peer(xnb_t *xnbp, mblk_t *mp) 149{ 150 _NOTE(ARGUNUSED(xnbp)); 151 uint16_t r = 0; 152 uint32_t pflags, csum; 153 154#ifdef XNBO_DEBUG 155 if (!xnbo_cksum_offload_to_peer) 156 return (0); 157#endif /* XNBO_DEBUG */ 158 159 /* 160 * We might also check for HCK_PARTIALCKSUM here and, 161 * providing that the partial checksum covers the TCP/UDP 162 * payload, return NETRXF_data_validated. 163 * 164 * It seems that it's probably not worthwhile, as even MAC 165 * devices which advertise HCKSUM_INET_PARTIAL in their 166 * capabilities tend to use HCK_FULLCKSUM on the receive side 167 * - they are actually saying that in the output path the 168 * caller must use HCK_PARTIALCKSUM. 169 * 170 * Then again, if a NIC supports HCK_PARTIALCKSUM in its' 171 * output path, the host IP stack will use it. If such packets 172 * are destined for the peer (i.e. looped around) we would 173 * gain some advantage. 174 */ 175 176 mac_hcksum_get(mp, NULL, NULL, NULL, &csum, &pflags); 177 178 /* 179 * If the MAC driver has asserted that the checksum is 180 * good, let the peer know. 181 */ 182 if (((pflags & HCK_FULLCKSUM) != 0) && 183 (((pflags & HCK_FULLCKSUM_OK) != 0) || 184 (csum == 0xffff))) 185 r |= NETRXF_data_validated; 186 187 return (r); 188} 189 190/* 191 * Packets from the mac device come here. We pass them to the peer. 192 */ 193/*ARGSUSED*/ 194static void 195xnbo_from_mac(void *arg, mac_resource_handle_t mrh, mblk_t *mp, 196 boolean_t loopback) 197{ 198 xnb_t *xnbp = arg; 199 200 mp = xnb_copy_to_peer(xnbp, mp); 201 202 if (mp != NULL) 203 freemsgchain(mp); 204} 205 206/* 207 * Packets from the mac device come here. We pass them to the peer if 208 * the destination mac address matches or it's a multicast/broadcast 209 * address. 210 */ 211static void 212xnbo_from_mac_filter(void *arg, mac_resource_handle_t mrh, mblk_t *mp, 213 boolean_t loopback) 214{ 215 _NOTE(ARGUNUSED(loopback)); 216 xnb_t *xnbp = arg; 217 xnbo_t *xnbop = xnbp->xnb_flavour_data; 218 mblk_t *next, *keep, *keep_head, *free, *free_head; 219 220 keep = keep_head = free = free_head = NULL; 221 222#define ADD(list, bp) \ 223 if (list != NULL) \ 224 list->b_next = bp; \ 225 else \ 226 list##_head = bp; \ 227 list = bp; 228 229 for (; mp != NULL; mp = next) { 230 mac_header_info_t hdr_info; 231 232 next = mp->b_next; 233 mp->b_next = NULL; 234 235 if (mac_header_info(xnbop->o_mh, mp, &hdr_info) != 0) { 236 ADD(free, mp); 237 continue; 238 } 239 240 if ((hdr_info.mhi_dsttype == MAC_ADDRTYPE_BROADCAST) || 241 (hdr_info.mhi_dsttype == MAC_ADDRTYPE_MULTICAST)) { 242 ADD(keep, mp); 243 continue; 244 } 245 246 if (bcmp(hdr_info.mhi_daddr, xnbp->xnb_mac_addr, 247 sizeof (xnbp->xnb_mac_addr)) == 0) { 248 ADD(keep, mp); 249 continue; 250 } 251 252 ADD(free, mp); 253 } 254#undef ADD 255 256 if (keep_head != NULL) 257 xnbo_from_mac(xnbp, mrh, keep_head, B_FALSE); 258 259 if (free_head != NULL) 260 freemsgchain(free_head); 261} 262 263static boolean_t 264xnbo_open_mac(xnb_t *xnbp, char *mac) 265{ 266 xnbo_t *xnbop = xnbp->xnb_flavour_data; 267 int err; 268 const mac_info_t *mi; 269 void (*rx_fn)(void *, mac_resource_handle_t, mblk_t *, boolean_t); 270 struct ether_addr ea; 271 uint_t max_sdu; 272 mac_diag_t diag; 273 274 if ((err = mac_open_by_linkname(mac, &xnbop->o_mh)) != 0) { 275 cmn_err(CE_WARN, "xnbo_open_mac: " 276 "cannot open mac for link %s (%d)", mac, err); 277 return (B_FALSE); 278 } 279 ASSERT(xnbop->o_mh != NULL); 280 281 mi = mac_info(xnbop->o_mh); 282 ASSERT(mi != NULL); 283 284 if (mi->mi_media != DL_ETHER) { 285 cmn_err(CE_WARN, "xnbo_open_mac: " 286 "device is not DL_ETHER (%d)", mi->mi_media); 287 i_xnbo_close_mac(xnbp, B_TRUE); 288 return (B_FALSE); 289 } 290 if (mi->mi_media != mi->mi_nativemedia) { 291 cmn_err(CE_WARN, "xnbo_open_mac: " 292 "device media and native media mismatch (%d != %d)", 293 mi->mi_media, mi->mi_nativemedia); 294 i_xnbo_close_mac(xnbp, B_TRUE); 295 return (B_FALSE); 296 } 297 298 mac_sdu_get(xnbop->o_mh, NULL, &max_sdu); 299 if (max_sdu > XNBMAXPKT) { 300 cmn_err(CE_WARN, "xnbo_open_mac: mac device SDU too big (%d)", 301 max_sdu); 302 i_xnbo_close_mac(xnbp, B_TRUE); 303 return (B_FALSE); 304 } 305 306 /* 307 * MAC_OPEN_FLAGS_MULTI_PRIMARY is relevant when we are migrating a 308 * guest on the localhost itself. In this case we would have the MAC 309 * client open for the guest being migrated *and* also for the 310 * migrated guest (i.e. the former will be active till the migration 311 * is complete when the latter will be activated). This flag states 312 * that it is OK for mac_unicast_add to add the primary MAC unicast 313 * address multiple times. 314 */ 315 if (mac_client_open(xnbop->o_mh, &xnbop->o_mch, NULL, 316 MAC_OPEN_FLAGS_USE_DATALINK_NAME | 317 MAC_OPEN_FLAGS_MULTI_PRIMARY) != 0) { 318 cmn_err(CE_WARN, "xnbo_open_mac: " 319 "error (%d) opening mac client", err); 320 i_xnbo_close_mac(xnbp, B_TRUE); 321 return (B_FALSE); 322 } 323 324 if (xnbop->o_need_rx_filter) 325 rx_fn = xnbo_from_mac_filter; 326 else 327 rx_fn = xnbo_from_mac; 328 329 err = mac_unicast_add_set_rx(xnbop->o_mch, NULL, MAC_UNICAST_PRIMARY, 330 &xnbop->o_mah, 0, &diag, xnbop->o_multicast_control ? rx_fn : NULL, 331 xnbp); 332 if (err != 0) { 333 cmn_err(CE_WARN, "xnbo_open_mac: failed to get the primary " 334 "MAC address of %s: %d", mac, err); 335 i_xnbo_close_mac(xnbp, B_TRUE); 336 return (B_FALSE); 337 } 338 if (!xnbop->o_multicast_control) { 339 err = mac_promisc_add(xnbop->o_mch, MAC_CLIENT_PROMISC_ALL, 340 rx_fn, xnbp, &xnbop->o_mphp, MAC_PROMISC_FLAGS_NO_TX_LOOP | 341 MAC_PROMISC_FLAGS_VLAN_TAG_STRIP); 342 if (err != 0) { 343 cmn_err(CE_WARN, "xnbo_open_mac: " 344 "cannot enable promiscuous mode of %s: %d", 345 mac, err); 346 i_xnbo_close_mac(xnbp, B_TRUE); 347 return (B_FALSE); 348 } 349 xnbop->o_promiscuous = B_TRUE; 350 } 351 352 if (xnbop->o_need_setphysaddr) { 353 err = mac_unicast_primary_set(xnbop->o_mh, xnbp->xnb_mac_addr); 354 /* Warn, but continue on. */ 355 if (err != 0) { 356 bcopy(xnbp->xnb_mac_addr, ea.ether_addr_octet, 357 ETHERADDRL); 358 cmn_err(CE_WARN, "xnbo_open_mac: " 359 "cannot set MAC address of %s to " 360 "%s: %d", mac, ether_sprintf(&ea), err); 361 } 362 } 363 364 if (!mac_capab_get(xnbop->o_mh, MAC_CAPAB_HCKSUM, 365 &xnbop->o_hcksum_capab)) 366 xnbop->o_hcksum_capab = 0; 367 368 xnbop->o_running = B_TRUE; 369 370 return (B_TRUE); 371} 372 373static void 374xnbo_close_mac(xnb_t *xnbp) 375{ 376 i_xnbo_close_mac(xnbp, B_FALSE); 377} 378 379static void 380i_xnbo_close_mac(xnb_t *xnbp, boolean_t locked) 381{ 382 xnbo_t *xnbop = xnbp->xnb_flavour_data; 383 xmca_t *loop; 384 385 ASSERT(!locked || MUTEX_HELD(&xnbp->xnb_state_lock)); 386 387 if (xnbop->o_mh == NULL) 388 return; 389 390 if (xnbop->o_running) 391 xnbop->o_running = B_FALSE; 392 393 if (!locked) 394 mutex_enter(&xnbp->xnb_state_lock); 395 loop = xnbop->o_mca; 396 xnbop->o_mca = NULL; 397 if (!locked) 398 mutex_exit(&xnbp->xnb_state_lock); 399 400 while (loop != NULL) { 401 xmca_t *next = loop->next; 402 403 DTRACE_PROBE3(mcast_remove, 404 (char *), "close", 405 (void *), xnbp, 406 (etheraddr_t *), loop->addr); 407 (void) mac_multicast_remove(xnbop->o_mch, loop->addr); 408 kmem_free(loop, sizeof (*loop)); 409 loop = next; 410 } 411 412 if (xnbop->o_promiscuous) { 413 if (xnbop->o_mphp != NULL) { 414 mac_promisc_remove(xnbop->o_mphp); 415 xnbop->o_mphp = NULL; 416 } 417 xnbop->o_promiscuous = B_FALSE; 418 } else { 419 if (xnbop->o_mch != NULL) 420 mac_rx_clear(xnbop->o_mch); 421 } 422 423 if (xnbop->o_mah != NULL) { 424 (void) mac_unicast_remove(xnbop->o_mch, xnbop->o_mah); 425 xnbop->o_mah = NULL; 426 } 427 428 if (xnbop->o_mch != NULL) { 429 mac_client_close(xnbop->o_mch, 0); 430 xnbop->o_mch = NULL; 431 } 432 433 mac_close(xnbop->o_mh); 434 xnbop->o_mh = NULL; 435} 436 437/* 438 * Hotplug has completed and we are connected to the peer. We have all 439 * the information we need to exchange traffic, so open the MAC device 440 * and configure it appropriately. 441 */ 442static boolean_t 443xnbo_start_connect(xnb_t *xnbp) 444{ 445 xnbo_t *xnbop = xnbp->xnb_flavour_data; 446 447 return (xnbo_open_mac(xnbp, xnbop->o_link_name)); 448} 449 450/* 451 * The guest has successfully synchronize with this instance. We read 452 * the configuration of the guest from xenstore to check whether the 453 * guest requests multicast control. If not (the default) we make a 454 * note that the MAC device needs to be used in promiscious mode. 455 */ 456static boolean_t 457xnbo_peer_connected(xnb_t *xnbp) 458{ 459 char *oename; 460 int request; 461 xnbo_t *xnbop = xnbp->xnb_flavour_data; 462 463 oename = xvdi_get_oename(xnbp->xnb_devinfo); 464 465 if (xenbus_scanf(XBT_NULL, oename, 466 "request-multicast-control", "%d", &request) != 0) 467 request = 0; 468 xnbop->o_multicast_control = (request > 0); 469 470 return (B_TRUE); 471} 472 473/* 474 * The guest domain has closed down the inter-domain connection. We 475 * close the underlying MAC device. 476 */ 477static void 478xnbo_peer_disconnected(xnb_t *xnbp) 479{ 480 xnbo_close_mac(xnbp); 481} 482 483/* 484 * The hotplug script has completed. We read information from xenstore 485 * about our configuration, most notably the name of the MAC device we 486 * should use. 487 */ 488static boolean_t 489xnbo_hotplug_connected(xnb_t *xnbp) 490{ 491 char *xsname; 492 xnbo_t *xnbop = xnbp->xnb_flavour_data; 493 int need; 494 495 xsname = xvdi_get_xsname(xnbp->xnb_devinfo); 496 497 if (xenbus_scanf(XBT_NULL, xsname, 498 "nic", "%s", xnbop->o_link_name) != 0) { 499 cmn_err(CE_WARN, "xnbo_connect: " 500 "cannot read nic name from %s", xsname); 501 return (B_FALSE); 502 } 503 504 if (xenbus_scanf(XBT_NULL, xsname, 505 "SUNW-need-rx-filter", "%d", &need) != 0) 506 need = 0; 507 xnbop->o_need_rx_filter = (need > 0); 508 509 if (xenbus_scanf(XBT_NULL, xsname, 510 "SUNW-need-set-physaddr", "%d", &need) != 0) 511 need = 0; 512 xnbop->o_need_setphysaddr = (need > 0); 513 514 return (B_TRUE); 515} 516 517/* 518 * Find the multicast address `addr', return B_TRUE if it is one that 519 * we receive. If `remove', remove it from the set received. 520 */ 521static boolean_t 522xnbo_mcast_find(xnb_t *xnbp, ether_addr_t *addr, boolean_t remove) 523{ 524 xnbo_t *xnbop = xnbp->xnb_flavour_data; 525 xmca_t *prev, *del, *this; 526 527 ASSERT(MUTEX_HELD(&xnbp->xnb_state_lock)); 528 ASSERT(xnbop->o_promiscuous == B_FALSE); 529 530 prev = del = NULL; 531 532 this = xnbop->o_mca; 533 534 while (this != NULL) { 535 if (bcmp(&this->addr, addr, sizeof (this->addr)) == 0) { 536 del = this; 537 if (remove) { 538 if (prev == NULL) 539 xnbop->o_mca = this->next; 540 else 541 prev->next = this->next; 542 } 543 break; 544 } 545 546 prev = this; 547 this = this->next; 548 } 549 550 if (del == NULL) 551 return (B_FALSE); 552 553 if (remove) { 554 DTRACE_PROBE3(mcast_remove, 555 (char *), "remove", 556 (void *), xnbp, 557 (etheraddr_t *), del->addr); 558 mac_multicast_remove(xnbop->o_mch, del->addr); 559 kmem_free(del, sizeof (*del)); 560 } 561 562 return (B_TRUE); 563} 564 565/* 566 * Add the multicast address `addr' to the set received. 567 */ 568static boolean_t 569xnbo_mcast_add(xnb_t *xnbp, ether_addr_t *addr) 570{ 571 xnbo_t *xnbop = xnbp->xnb_flavour_data; 572 boolean_t r = B_FALSE; 573 574 ASSERT(xnbop->o_promiscuous == B_FALSE); 575 576 mutex_enter(&xnbp->xnb_state_lock); 577 578 if (xnbo_mcast_find(xnbp, addr, B_FALSE)) { 579 r = B_TRUE; 580 } else if (mac_multicast_add(xnbop->o_mch, 581 (const uint8_t *)addr) == 0) { 582 xmca_t *mca; 583 584 DTRACE_PROBE3(mcast_add, 585 (char *), "add", 586 (void *), xnbp, 587 (etheraddr_t *), addr); 588 589 mca = kmem_alloc(sizeof (*mca), KM_SLEEP); 590 bcopy(addr, &mca->addr, sizeof (mca->addr)); 591 592 mca->next = xnbop->o_mca; 593 xnbop->o_mca = mca; 594 595 r = B_TRUE; 596 } 597 598 mutex_exit(&xnbp->xnb_state_lock); 599 600 return (r); 601} 602 603/* 604 * Remove the multicast address `addr' from the set received. 605 */ 606static boolean_t 607xnbo_mcast_del(xnb_t *xnbp, ether_addr_t *addr) 608{ 609 boolean_t r; 610 611 mutex_enter(&xnbp->xnb_state_lock); 612 r = xnbo_mcast_find(xnbp, addr, B_TRUE); 613 mutex_exit(&xnbp->xnb_state_lock); 614 615 return (r); 616} 617 618static int 619xnbo_attach(dev_info_t *dip, ddi_attach_cmd_t cmd) 620{ 621 static xnb_flavour_t flavour = { 622 xnbo_to_mac, xnbo_peer_connected, xnbo_peer_disconnected, 623 xnbo_hotplug_connected, xnbo_start_connect, 624 xnbo_cksum_from_peer, xnbo_cksum_to_peer, 625 xnbo_mcast_add, xnbo_mcast_del, 626 }; 627 xnbo_t *xnbop; 628 629 switch (cmd) { 630 case DDI_ATTACH: 631 break; 632 case DDI_RESUME: 633 return (DDI_SUCCESS); 634 default: 635 return (DDI_FAILURE); 636 } 637 638 xnbop = kmem_zalloc(sizeof (*xnbop), KM_SLEEP); 639 640 if (xnb_attach(dip, &flavour, xnbop) != DDI_SUCCESS) { 641 kmem_free(xnbop, sizeof (*xnbop)); 642 return (DDI_FAILURE); 643 } 644 645 return (DDI_SUCCESS); 646} 647 648static int 649xnbo_detach(dev_info_t *dip, ddi_detach_cmd_t cmd) 650{ 651 xnb_t *xnbp = ddi_get_driver_private(dip); 652 xnbo_t *xnbop = xnbp->xnb_flavour_data; 653 654 switch (cmd) { 655 case DDI_DETACH: 656 break; 657 case DDI_SUSPEND: 658 return (DDI_SUCCESS); 659 default: 660 return (DDI_FAILURE); 661 } 662 663 mutex_enter(&xnbp->xnb_tx_lock); 664 mutex_enter(&xnbp->xnb_rx_lock); 665 666 if (!xnbp->xnb_detachable || xnbp->xnb_connected || 667 (xnbp->xnb_tx_buf_count > 0)) { 668 mutex_exit(&xnbp->xnb_rx_lock); 669 mutex_exit(&xnbp->xnb_tx_lock); 670 671 return (DDI_FAILURE); 672 } 673 674 mutex_exit(&xnbp->xnb_rx_lock); 675 mutex_exit(&xnbp->xnb_tx_lock); 676 677 xnbo_close_mac(xnbp); 678 kmem_free(xnbop, sizeof (*xnbop)); 679 680 xnb_detach(dip); 681 682 return (DDI_SUCCESS); 683} 684 685static struct cb_ops cb_ops = { 686 nulldev, /* open */ 687 nulldev, /* close */ 688 nodev, /* strategy */ 689 nodev, /* print */ 690 nodev, /* dump */ 691 nodev, /* read */ 692 nodev, /* write */ 693 nodev, /* ioctl */ 694 nodev, /* devmap */ 695 nodev, /* mmap */ 696 nodev, /* segmap */ 697 nochpoll, /* poll */ 698 ddi_prop_op, /* cb_prop_op */ 699 0, /* streamtab */ 700 D_NEW | D_MP | D_64BIT /* Driver compatibility flag */ 701}; 702 703static struct dev_ops ops = { 704 DEVO_REV, /* devo_rev */ 705 0, /* devo_refcnt */ 706 nulldev, /* devo_getinfo */ 707 nulldev, /* devo_identify */ 708 nulldev, /* devo_probe */ 709 xnbo_attach, /* devo_attach */ 710 xnbo_detach, /* devo_detach */ 711 nodev, /* devo_reset */ 712 &cb_ops, /* devo_cb_ops */ 713 (struct bus_ops *)0, /* devo_bus_ops */ 714 NULL, /* devo_power */ 715 ddi_quiesce_not_needed, /* devo_quiesce */ 716}; 717 718static struct modldrv modldrv = { 719 &mod_driverops, "xnbo driver", &ops, 720}; 721 722static struct modlinkage modlinkage = { 723 MODREV_1, &modldrv, NULL 724}; 725 726int 727_init(void) 728{ 729 return (mod_install(&modlinkage)); 730} 731 732int 733_info(struct modinfo *modinfop) 734{ 735 return (mod_info(&modlinkage, modinfop)); 736} 737 738int 739_fini(void) 740{ 741 return (mod_remove(&modlinkage)); 742} 743