1 /* 2 * Copyright (c) 1996 Gardner Buchanan <gbuchanan@shl.com> 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by Gardner Buchanan. 16 * 4. The name of Gardner Buchanan may not be used to endorse or promote 17 * products derived from this software without specific prior written 18 * permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 21 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 22 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 23 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 24 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 25 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 26 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 27 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 28 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 29 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 30 * 31 * $FreeBSD: src/sys/dev/sn/if_sn.c,v 1.7.2.3 2001/02/04 04:38:38 toshi Exp $ 32 * $DragonFly: src/sys/dev/netif/sn/if_sn.c,v 1.11 2004/07/23 07:16:28 joerg Exp $ 33 */ 34 35 /* 36 * This is a driver for SMC's 9000 series of Ethernet adapters. 37 * 38 * This FreeBSD driver is derived from the smc9194 Linux driver by 39 * Erik Stahlman and is Copyright (C) 1996 by Erik Stahlman. 40 * This driver also shamelessly borrows from the FreeBSD ep driver 41 * which is Copyright (C) 1994 Herb Peyerl <hpeyerl@novatel.ca> 42 * All rights reserved. 43 * 44 * It is set up for my SMC91C92 equipped Ampro LittleBoard embedded 45 * PC. It is adapted from Erik Stahlman's Linux driver which worked 46 * with his EFA Info*Express SVC VLB adaptor. According to SMC's databook, 47 * it will work for the entire SMC 9xxx series. (Ha Ha) 48 * 49 * "Features" of the SMC chip: 50 * 4608 byte packet memory. (for the 91C92. Others have more) 51 * EEPROM for configuration 52 * AUI/TP selection 53 * 54 * Authors: 55 * Erik Stahlman erik@vt.edu 56 * Herb Peyerl hpeyerl@novatel.ca 57 * Andres Vega Garcia avega@sophia.inria.fr 58 * Serge Babkin babkin@hq.icb.chel.su 59 * Gardner Buchanan gbuchanan@shl.com 60 * 61 * Sources: 62 * o SMC databook 63 * o "smc9194.c:v0.10(FIXED) 02/15/96 by Erik Stahlman (erik@vt.edu)" 64 * o "if_ep.c,v 1.19 1995/01/24 20:53:45 davidg Exp" 65 * 66 * Known Bugs: 67 * o The hardware multicast filter isn't used yet. 68 * o Setting of the hardware address isn't supported. 69 * o Hardware padding isn't used. 70 */ 71 72 /* 73 * Modifications for Megahertz X-Jack Ethernet Card (XJ-10BT) 74 * 75 * Copyright (c) 1996 by Tatsumi Hosokawa <hosokawa@jp.FreeBSD.org> 76 * BSD-nomads, Tokyo, Japan. 77 */ 78 /* 79 * Multicast support by Kei TANAKA <kei@pal.xerox.com> 80 * Special thanks to itojun@itojun.org 81 */ 82 83 #undef SN_DEBUG /* (by hosokawa) */ 84 85 #include <sys/param.h> 86 #include <sys/systm.h> 87 #include <sys/kernel.h> 88 #include <sys/errno.h> 89 #include <sys/sockio.h> 90 #include <sys/malloc.h> 91 #include <sys/mbuf.h> 92 #include <sys/socket.h> 93 #include <sys/syslog.h> 94 95 #include <sys/module.h> 96 #include <sys/bus.h> 97 98 #include <machine/bus.h> 99 #include <machine/resource.h> 100 #include <sys/rman.h> 101 102 #include <net/ethernet.h> 103 #include <net/if.h> 104 #include <net/if_arp.h> 105 #include <net/if_dl.h> 106 #include <net/if_types.h> 107 #include <net/if_mib.h> 108 109 #ifdef INET 110 #include <netinet/in.h> 111 #include <netinet/in_systm.h> 112 #include <netinet/in_var.h> 113 #include <netinet/ip.h> 114 #endif 115 116 #ifdef NS 117 #include <netns/ns.h> 118 #include <netns/ns_if.h> 119 #endif 120 121 #include <net/bpf.h> 122 #include <net/bpfdesc.h> 123 124 #include <machine/clock.h> 125 126 #include "if_snreg.h" 127 #include "if_snvar.h" 128 129 /* Exported variables */ 130 devclass_t sn_devclass; 131 132 static int snioctl(struct ifnet * ifp, u_long, caddr_t, struct ucred *); 133 134 static void snresume(struct ifnet *); 135 136 void sninit(void *); 137 void snread(struct ifnet *); 138 void snreset(struct sn_softc *); 139 void snstart(struct ifnet *); 140 void snstop(struct sn_softc *); 141 void snwatchdog(struct ifnet *); 142 143 static void sn_setmcast(struct sn_softc *); 144 static int sn_getmcf(struct arpcom *ac, u_char *mcf); 145 static u_int smc_crc(u_char *); 146 147 DECLARE_DUMMY_MODULE(if_sn); 148 149 /* I (GB) have been unlucky getting the hardware padding 150 * to work properly. 151 */ 152 #define SW_PAD 153 154 static const char *chip_ids[15] = { 155 NULL, NULL, NULL, 156 /* 3 */ "SMC91C90/91C92", 157 /* 4 */ "SMC91C94", 158 /* 5 */ "SMC91C95", 159 NULL, 160 /* 7 */ "SMC91C100", 161 /* 8 */ "SMC91C100FD", 162 NULL, NULL, NULL, 163 NULL, NULL, NULL 164 }; 165 166 int 167 sn_attach(device_t dev) 168 { 169 struct sn_softc *sc = device_get_softc(dev); 170 struct ifnet *ifp = &sc->arpcom.ac_if; 171 u_short i; 172 u_char *p; 173 struct ifaddr *ifa; 174 struct sockaddr_dl *sdl; 175 int rev; 176 u_short address; 177 int j; 178 179 sn_activate(dev); 180 181 snstop(sc); 182 183 sc->dev = dev; 184 sc->pages_wanted = -1; 185 186 device_printf(dev, " "); 187 188 SMC_SELECT_BANK(3); 189 rev = inw(BASE + REVISION_REG_W); 190 if (chip_ids[(rev >> 4) & 0xF]) 191 printf("%s ", chip_ids[(rev >> 4) & 0xF]); 192 193 SMC_SELECT_BANK(1); 194 i = inw(BASE + CONFIG_REG_W); 195 printf("%s\n", i & CR_AUI_SELECT ? "AUI" : "UTP"); 196 197 if (sc->pccard_enaddr) 198 for (j = 0; j < 3; j++) { 199 u_short w; 200 201 w = (u_short)sc->arpcom.ac_enaddr[j * 2] | 202 (((u_short)sc->arpcom.ac_enaddr[j * 2 + 1]) << 8); 203 outw(BASE + IAR_ADDR0_REG_W + j * 2, w); 204 } 205 206 /* 207 * Read the station address from the chip. The MAC address is bank 1, 208 * regs 4 - 9 209 */ 210 SMC_SELECT_BANK(1); 211 p = (u_char *) & sc->arpcom.ac_enaddr; 212 for (i = 0; i < 6; i += 2) { 213 address = inw(BASE + IAR_ADDR0_REG_W + i); 214 p[i + 1] = address >> 8; 215 p[i] = address & 0xFF; 216 } 217 ifp->if_softc = sc; 218 if_initname(ifp, "sn", device_get_unit(dev)); 219 ifp->if_mtu = ETHERMTU; 220 ifp->if_flags = IFF_BROADCAST | IFF_SIMPLEX | IFF_MULTICAST; 221 ifp->if_start = snstart; 222 ifp->if_ioctl = snioctl; 223 ifp->if_watchdog = snwatchdog; 224 ifp->if_init = sninit; 225 ifp->if_snd.ifq_maxlen = IFQ_MAXLEN; 226 ifp->if_timer = 0; 227 228 ether_ifattach(ifp, sc->arpcom.ac_enaddr); 229 230 /* 231 * Fill the hardware address into ifa_addr if we find an AF_LINK 232 * entry. We need to do this so bpf's can get the hardware addr of 233 * this card. netstat likes this too! 234 */ 235 ifa = TAILQ_FIRST(&ifp->if_addrhead); 236 while ((ifa != 0) && (ifa->ifa_addr != 0) && 237 (ifa->ifa_addr->sa_family != AF_LINK)) 238 ifa = TAILQ_NEXT(ifa, ifa_link); 239 240 if ((ifa != 0) && (ifa->ifa_addr != 0)) { 241 sdl = (struct sockaddr_dl *) ifa->ifa_addr; 242 sdl->sdl_type = IFT_ETHER; 243 sdl->sdl_alen = ETHER_ADDR_LEN; 244 sdl->sdl_slen = 0; 245 bcopy(sc->arpcom.ac_enaddr, LLADDR(sdl), ETHER_ADDR_LEN); 246 } 247 248 return 0; 249 } 250 251 252 /* 253 * Reset and initialize the chip 254 */ 255 void 256 sninit(void *xsc) 257 { 258 struct sn_softc *sc = xsc; 259 struct ifnet *ifp = &sc->arpcom.ac_if; 260 int s; 261 int flags; 262 int mask; 263 264 s = splimp(); 265 266 /* 267 * This resets the registers mostly to defaults, but doesn't affect 268 * EEPROM. After the reset cycle, we pause briefly for the chip to 269 * be happy. 270 */ 271 SMC_SELECT_BANK(0); 272 outw(BASE + RECV_CONTROL_REG_W, RCR_SOFTRESET); 273 SMC_DELAY(); 274 outw(BASE + RECV_CONTROL_REG_W, 0x0000); 275 SMC_DELAY(); 276 SMC_DELAY(); 277 278 outw(BASE + TXMIT_CONTROL_REG_W, 0x0000); 279 280 /* 281 * Set the control register to automatically release succesfully 282 * transmitted packets (making the best use out of our limited 283 * memory) and to enable the EPH interrupt on certain TX errors. 284 */ 285 SMC_SELECT_BANK(1); 286 outw(BASE + CONTROL_REG_W, (CTR_AUTO_RELEASE | CTR_TE_ENABLE | 287 CTR_CR_ENABLE | CTR_LE_ENABLE)); 288 289 /* Set squelch level to 240mV (default 480mV) */ 290 flags = inw(BASE + CONFIG_REG_W); 291 flags |= CR_SET_SQLCH; 292 outw(BASE + CONFIG_REG_W, flags); 293 294 /* 295 * Reset the MMU and wait for it to be un-busy. 296 */ 297 SMC_SELECT_BANK(2); 298 outw(BASE + MMU_CMD_REG_W, MMUCR_RESET); 299 while (inw(BASE + MMU_CMD_REG_W) & MMUCR_BUSY) /* NOTHING */ 300 ; 301 302 /* 303 * Disable all interrupts 304 */ 305 outb(BASE + INTR_MASK_REG_B, 0x00); 306 307 sn_setmcast(sc); 308 309 /* 310 * Set the transmitter control. We want it enabled. 311 */ 312 flags = TCR_ENABLE; 313 314 #ifndef SW_PAD 315 /* 316 * I (GB) have been unlucky getting this to work. 317 */ 318 flags |= TCR_PAD_ENABLE; 319 #endif /* SW_PAD */ 320 321 outw(BASE + TXMIT_CONTROL_REG_W, flags); 322 323 324 /* 325 * Now, enable interrupts 326 */ 327 SMC_SELECT_BANK(2); 328 329 mask = IM_EPH_INT | 330 IM_RX_OVRN_INT | 331 IM_RCV_INT | 332 IM_TX_INT; 333 334 outb(BASE + INTR_MASK_REG_B, mask); 335 sc->intr_mask = mask; 336 sc->pages_wanted = -1; 337 338 339 /* 340 * Mark the interface running but not active. 341 */ 342 ifp->if_flags |= IFF_RUNNING; 343 ifp->if_flags &= ~IFF_OACTIVE; 344 345 /* 346 * Attempt to push out any waiting packets. 347 */ 348 snstart(ifp); 349 350 splx(s); 351 } 352 353 354 void 355 snstart(struct ifnet *ifp) 356 { 357 struct sn_softc *sc = ifp->if_softc; 358 u_int len; 359 struct mbuf *m; 360 struct mbuf *top; 361 int s, pad; 362 int mask; 363 u_short length; 364 u_short numPages; 365 u_char packet_no; 366 int time_out; 367 368 s = splimp(); 369 370 if (sc->arpcom.ac_if.if_flags & IFF_OACTIVE) { 371 splx(s); 372 return; 373 } 374 if (sc->pages_wanted != -1) { 375 splx(s); 376 printf("%s: snstart() while memory allocation pending\n", 377 ifp->if_xname); 378 return; 379 } 380 startagain: 381 382 /* 383 * Sneak a peek at the next packet 384 */ 385 m = sc->arpcom.ac_if.if_snd.ifq_head; 386 if (m == 0) { 387 splx(s); 388 return; 389 } 390 /* 391 * Compute the frame length and set pad to give an overall even 392 * number of bytes. Below we assume that the packet length is even. 393 */ 394 for (len = 0, top = m; m; m = m->m_next) 395 len += m->m_len; 396 397 pad = (len & 1); 398 399 /* 400 * We drop packets that are too large. Perhaps we should truncate 401 * them instead? 402 */ 403 if (len + pad > ETHER_MAX_LEN - ETHER_CRC_LEN) { 404 printf("%s: large packet discarded (A)\n", ifp->if_xname); 405 ++sc->arpcom.ac_if.if_oerrors; 406 IF_DEQUEUE(&sc->arpcom.ac_if.if_snd, m); 407 m_freem(m); 408 goto readcheck; 409 } 410 #ifdef SW_PAD 411 412 /* 413 * If HW padding is not turned on, then pad to ETHER_MIN_LEN. 414 */ 415 if (len < ETHER_MIN_LEN - ETHER_CRC_LEN) 416 pad = ETHER_MIN_LEN - ETHER_CRC_LEN - len; 417 418 #endif /* SW_PAD */ 419 420 length = pad + len; 421 422 /* 423 * The MMU wants the number of pages to be the number of 256 byte 424 * 'pages', minus 1 (A packet can't ever have 0 pages. We also 425 * include space for the status word, byte count and control bytes in 426 * the allocation request. 427 */ 428 numPages = (length + 6) >> 8; 429 430 431 /* 432 * Now, try to allocate the memory 433 */ 434 SMC_SELECT_BANK(2); 435 outw(BASE + MMU_CMD_REG_W, MMUCR_ALLOC | numPages); 436 437 /* 438 * Wait a short amount of time to see if the allocation request 439 * completes. Otherwise, I enable the interrupt and wait for 440 * completion asyncronously. 441 */ 442 443 time_out = MEMORY_WAIT_TIME; 444 do { 445 if (inb(BASE + INTR_STAT_REG_B) & IM_ALLOC_INT) 446 break; 447 } while (--time_out); 448 449 if (!time_out) { 450 451 /* 452 * No memory now. Oh well, wait until the chip finds memory 453 * later. Remember how many pages we were asking for and 454 * enable the allocation completion interrupt. Also set a 455 * watchdog in case we miss the interrupt. We mark the 456 * interface active since there is no point in attempting an 457 * snstart() until after the memory is available. 458 */ 459 mask = inb(BASE + INTR_MASK_REG_B) | IM_ALLOC_INT; 460 outb(BASE + INTR_MASK_REG_B, mask); 461 sc->intr_mask = mask; 462 463 sc->arpcom.ac_if.if_timer = 1; 464 sc->arpcom.ac_if.if_flags |= IFF_OACTIVE; 465 sc->pages_wanted = numPages; 466 467 splx(s); 468 return; 469 } 470 /* 471 * The memory allocation completed. Check the results. 472 */ 473 packet_no = inb(BASE + ALLOC_RESULT_REG_B); 474 if (packet_no & ARR_FAILED) { 475 printf("%s: Memory allocation failed\n", ifp->if_xname); 476 goto startagain; 477 } 478 /* 479 * We have a packet number, so tell the card to use it. 480 */ 481 outb(BASE + PACKET_NUM_REG_B, packet_no); 482 483 /* 484 * Point to the beginning of the packet 485 */ 486 outw(BASE + POINTER_REG_W, PTR_AUTOINC | 0x0000); 487 488 /* 489 * Send the packet length (+6 for status, length and control byte) 490 * and the status word (set to zeros) 491 */ 492 outw(BASE + DATA_REG_W, 0); 493 outb(BASE + DATA_REG_B, (length + 6) & 0xFF); 494 outb(BASE + DATA_REG_B, (length + 6) >> 8); 495 496 /* 497 * Get the packet from the kernel. This will include the Ethernet 498 * frame header, MAC Addresses etc. 499 */ 500 IF_DEQUEUE(&sc->arpcom.ac_if.if_snd, m); 501 502 /* 503 * Push out the data to the card. 504 */ 505 for (top = m; m != 0; m = m->m_next) { 506 507 /* 508 * Push out words. 509 */ 510 outsw(BASE + DATA_REG_W, mtod(m, caddr_t), m->m_len / 2); 511 512 /* 513 * Push out remaining byte. 514 */ 515 if (m->m_len & 1) 516 outb(BASE + DATA_REG_B, *(mtod(m, caddr_t) + m->m_len - 1)); 517 } 518 519 /* 520 * Push out padding. 521 */ 522 while (pad > 1) { 523 outw(BASE + DATA_REG_W, 0); 524 pad -= 2; 525 } 526 if (pad) 527 outb(BASE + DATA_REG_B, 0); 528 529 /* 530 * Push out control byte and unused packet byte The control byte is 0 531 * meaning the packet is even lengthed and no special CRC handling is 532 * desired. 533 */ 534 outw(BASE + DATA_REG_W, 0); 535 536 /* 537 * Enable the interrupts and let the chipset deal with it Also set a 538 * watchdog in case we miss the interrupt. 539 */ 540 mask = inb(BASE + INTR_MASK_REG_B) | (IM_TX_INT | IM_TX_EMPTY_INT); 541 outb(BASE + INTR_MASK_REG_B, mask); 542 sc->intr_mask = mask; 543 544 outw(BASE + MMU_CMD_REG_W, MMUCR_ENQUEUE); 545 546 sc->arpcom.ac_if.if_flags |= IFF_OACTIVE; 547 sc->arpcom.ac_if.if_timer = 1; 548 549 if (ifp->if_bpf) { 550 bpf_mtap(ifp, top); 551 } 552 553 sc->arpcom.ac_if.if_opackets++; 554 m_freem(top); 555 556 557 readcheck: 558 559 /* 560 * Is another packet coming in? We don't want to overflow the tiny 561 * RX FIFO. If nothing has arrived then attempt to queue another 562 * transmit packet. 563 */ 564 if (inw(BASE + FIFO_PORTS_REG_W) & FIFO_REMPTY) 565 goto startagain; 566 567 splx(s); 568 return; 569 } 570 571 572 573 /* Resume a packet transmit operation after a memory allocation 574 * has completed. 575 * 576 * This is basically a hacked up copy of snstart() which handles 577 * a completed memory allocation the same way snstart() does. 578 * It then passes control to snstart to handle any other queued 579 * packets. 580 */ 581 static void 582 snresume(struct ifnet *ifp) 583 { 584 struct sn_softc *sc = ifp->if_softc; 585 u_int len; 586 struct mbuf *m; 587 struct mbuf *top; 588 int pad; 589 int mask; 590 u_short length; 591 u_short numPages; 592 u_short pages_wanted; 593 u_char packet_no; 594 595 if (sc->pages_wanted < 0) 596 return; 597 598 pages_wanted = sc->pages_wanted; 599 sc->pages_wanted = -1; 600 601 /* 602 * Sneak a peek at the next packet 603 */ 604 m = sc->arpcom.ac_if.if_snd.ifq_head; 605 if (m == 0) { 606 printf("%s: snresume() with nothing to send\n", ifp->if_xname); 607 return; 608 } 609 /* 610 * Compute the frame length and set pad to give an overall even 611 * number of bytes. Below we assume that the packet length is even. 612 */ 613 for (len = 0, top = m; m; m = m->m_next) 614 len += m->m_len; 615 616 pad = (len & 1); 617 618 /* 619 * We drop packets that are too large. Perhaps we should truncate 620 * them instead? 621 */ 622 if (len + pad > ETHER_MAX_LEN - ETHER_CRC_LEN) { 623 printf("%s: large packet discarded (B)\n", ifp->if_xname); 624 ++sc->arpcom.ac_if.if_oerrors; 625 IF_DEQUEUE(&sc->arpcom.ac_if.if_snd, m); 626 m_freem(m); 627 return; 628 } 629 #ifdef SW_PAD 630 631 /* 632 * If HW padding is not turned on, then pad to ETHER_MIN_LEN. 633 */ 634 if (len < ETHER_MIN_LEN - ETHER_CRC_LEN) 635 pad = ETHER_MIN_LEN - ETHER_CRC_LEN - len; 636 637 #endif /* SW_PAD */ 638 639 length = pad + len; 640 641 642 /* 643 * The MMU wants the number of pages to be the number of 256 byte 644 * 'pages', minus 1 (A packet can't ever have 0 pages. We also 645 * include space for the status word, byte count and control bytes in 646 * the allocation request. 647 */ 648 numPages = (length + 6) >> 8; 649 650 651 SMC_SELECT_BANK(2); 652 653 /* 654 * The memory allocation completed. Check the results. If it failed, 655 * we simply set a watchdog timer and hope for the best. 656 */ 657 packet_no = inb(BASE + ALLOC_RESULT_REG_B); 658 if (packet_no & ARR_FAILED) { 659 printf("%s: Memory allocation failed. Weird.\n", ifp->if_xname); 660 sc->arpcom.ac_if.if_timer = 1; 661 goto try_start; 662 } 663 /* 664 * We have a packet number, so tell the card to use it. 665 */ 666 outb(BASE + PACKET_NUM_REG_B, packet_no); 667 668 /* 669 * Now, numPages should match the pages_wanted recorded when the 670 * memory allocation was initiated. 671 */ 672 if (pages_wanted != numPages) { 673 printf("%s: memory allocation wrong size. Weird.\n", ifp->if_xname); 674 /* 675 * If the allocation was the wrong size we simply release the 676 * memory once it is granted. Wait for the MMU to be un-busy. 677 */ 678 while (inw(BASE + MMU_CMD_REG_W) & MMUCR_BUSY) /* NOTHING */ 679 ; 680 outw(BASE + MMU_CMD_REG_W, MMUCR_FREEPKT); 681 682 return; 683 } 684 /* 685 * Point to the beginning of the packet 686 */ 687 outw(BASE + POINTER_REG_W, PTR_AUTOINC | 0x0000); 688 689 /* 690 * Send the packet length (+6 for status, length and control byte) 691 * and the status word (set to zeros) 692 */ 693 outw(BASE + DATA_REG_W, 0); 694 outb(BASE + DATA_REG_B, (length + 6) & 0xFF); 695 outb(BASE + DATA_REG_B, (length + 6) >> 8); 696 697 /* 698 * Get the packet from the kernel. This will include the Ethernet 699 * frame header, MAC Addresses etc. 700 */ 701 IF_DEQUEUE(&sc->arpcom.ac_if.if_snd, m); 702 703 /* 704 * Push out the data to the card. 705 */ 706 for (top = m; m != 0; m = m->m_next) { 707 708 /* 709 * Push out words. 710 */ 711 outsw(BASE + DATA_REG_W, mtod(m, caddr_t), m->m_len / 2); 712 713 /* 714 * Push out remaining byte. 715 */ 716 if (m->m_len & 1) 717 outb(BASE + DATA_REG_B, *(mtod(m, caddr_t) + m->m_len - 1)); 718 } 719 720 /* 721 * Push out padding. 722 */ 723 while (pad > 1) { 724 outw(BASE + DATA_REG_W, 0); 725 pad -= 2; 726 } 727 if (pad) 728 outb(BASE + DATA_REG_B, 0); 729 730 /* 731 * Push out control byte and unused packet byte The control byte is 0 732 * meaning the packet is even lengthed and no special CRC handling is 733 * desired. 734 */ 735 outw(BASE + DATA_REG_W, 0); 736 737 /* 738 * Enable the interrupts and let the chipset deal with it Also set a 739 * watchdog in case we miss the interrupt. 740 */ 741 mask = inb(BASE + INTR_MASK_REG_B) | (IM_TX_INT | IM_TX_EMPTY_INT); 742 outb(BASE + INTR_MASK_REG_B, mask); 743 sc->intr_mask = mask; 744 outw(BASE + MMU_CMD_REG_W, MMUCR_ENQUEUE); 745 746 if (ifp->if_bpf) { 747 bpf_mtap(ifp, top); 748 } 749 750 sc->arpcom.ac_if.if_opackets++; 751 m_freem(top); 752 753 try_start: 754 755 /* 756 * Now pass control to snstart() to queue any additional packets 757 */ 758 sc->arpcom.ac_if.if_flags &= ~IFF_OACTIVE; 759 snstart(ifp); 760 761 /* 762 * We've sent something, so we're active. Set a watchdog in case the 763 * TX_EMPTY interrupt is lost. 764 */ 765 sc->arpcom.ac_if.if_flags |= IFF_OACTIVE; 766 sc->arpcom.ac_if.if_timer = 1; 767 768 return; 769 } 770 771 772 void 773 sn_intr(void *arg) 774 { 775 int status, interrupts; 776 struct sn_softc *sc = (struct sn_softc *) arg; 777 struct ifnet *ifp = &sc->arpcom.ac_if; 778 int x; 779 780 /* 781 * Chip state registers 782 */ 783 u_char mask; 784 u_char packet_no; 785 u_short tx_status; 786 u_short card_stats; 787 788 /* 789 * if_ep.c did this, so I do too. Yet if_ed.c doesn't. I wonder... 790 */ 791 x = splbio(); 792 793 /* 794 * Clear the watchdog. 795 */ 796 ifp->if_timer = 0; 797 798 SMC_SELECT_BANK(2); 799 800 /* 801 * Obtain the current interrupt mask and clear the hardware mask 802 * while servicing interrupts. 803 */ 804 mask = inb(BASE + INTR_MASK_REG_B); 805 outb(BASE + INTR_MASK_REG_B, 0x00); 806 807 /* 808 * Get the set of interrupts which occurred and eliminate any which 809 * are masked. 810 */ 811 interrupts = inb(BASE + INTR_STAT_REG_B); 812 status = interrupts & mask; 813 814 /* 815 * Now, process each of the interrupt types. 816 */ 817 818 /* 819 * Receive Overrun. 820 */ 821 if (status & IM_RX_OVRN_INT) { 822 823 /* 824 * Acknowlege Interrupt 825 */ 826 SMC_SELECT_BANK(2); 827 outb(BASE + INTR_ACK_REG_B, IM_RX_OVRN_INT); 828 829 ++sc->arpcom.ac_if.if_ierrors; 830 } 831 /* 832 * Got a packet. 833 */ 834 if (status & IM_RCV_INT) { 835 #if 1 836 int packet_number; 837 838 SMC_SELECT_BANK(2); 839 packet_number = inw(BASE + FIFO_PORTS_REG_W); 840 841 if (packet_number & FIFO_REMPTY) { 842 843 /* 844 * we got called , but nothing was on the FIFO 845 */ 846 printf("sn: Receive interrupt with nothing on FIFO\n"); 847 848 goto out; 849 } 850 #endif 851 snread(ifp); 852 } 853 /* 854 * An on-card memory allocation came through. 855 */ 856 if (status & IM_ALLOC_INT) { 857 858 /* 859 * Disable this interrupt. 860 */ 861 mask &= ~IM_ALLOC_INT; 862 sc->arpcom.ac_if.if_flags &= ~IFF_OACTIVE; 863 snresume(&sc->arpcom.ac_if); 864 } 865 /* 866 * TX Completion. Handle a transmit error message. This will only be 867 * called when there is an error, because of the AUTO_RELEASE mode. 868 */ 869 if (status & IM_TX_INT) { 870 871 /* 872 * Acknowlege Interrupt 873 */ 874 SMC_SELECT_BANK(2); 875 outb(BASE + INTR_ACK_REG_B, IM_TX_INT); 876 877 packet_no = inw(BASE + FIFO_PORTS_REG_W); 878 packet_no &= FIFO_TX_MASK; 879 880 /* 881 * select this as the packet to read from 882 */ 883 outb(BASE + PACKET_NUM_REG_B, packet_no); 884 885 /* 886 * Position the pointer to the first word from this packet 887 */ 888 outw(BASE + POINTER_REG_W, PTR_AUTOINC | PTR_READ | 0x0000); 889 890 /* 891 * Fetch the TX status word. The value found here will be a 892 * copy of the EPH_STATUS_REG_W at the time the transmit 893 * failed. 894 */ 895 tx_status = inw(BASE + DATA_REG_W); 896 897 if (tx_status & EPHSR_TX_SUC) { 898 device_printf(sc->dev, 899 "Successful packet caused interrupt\n"); 900 } else { 901 ++sc->arpcom.ac_if.if_oerrors; 902 } 903 904 if (tx_status & EPHSR_LATCOL) 905 ++sc->arpcom.ac_if.if_collisions; 906 907 /* 908 * Some of these errors will have disabled transmit. 909 * Re-enable transmit now. 910 */ 911 SMC_SELECT_BANK(0); 912 913 #ifdef SW_PAD 914 outw(BASE + TXMIT_CONTROL_REG_W, TCR_ENABLE); 915 #else 916 outw(BASE + TXMIT_CONTROL_REG_W, TCR_ENABLE | TCR_PAD_ENABLE); 917 #endif /* SW_PAD */ 918 919 /* 920 * kill the failed packet. Wait for the MMU to be un-busy. 921 */ 922 SMC_SELECT_BANK(2); 923 while (inw(BASE + MMU_CMD_REG_W) & MMUCR_BUSY) /* NOTHING */ 924 ; 925 outw(BASE + MMU_CMD_REG_W, MMUCR_FREEPKT); 926 927 /* 928 * Attempt to queue more transmits. 929 */ 930 sc->arpcom.ac_if.if_flags &= ~IFF_OACTIVE; 931 snstart(&sc->arpcom.ac_if); 932 } 933 /* 934 * Transmit underrun. We use this opportunity to update transmit 935 * statistics from the card. 936 */ 937 if (status & IM_TX_EMPTY_INT) { 938 939 /* 940 * Acknowlege Interrupt 941 */ 942 SMC_SELECT_BANK(2); 943 outb(BASE + INTR_ACK_REG_B, IM_TX_EMPTY_INT); 944 945 /* 946 * Disable this interrupt. 947 */ 948 mask &= ~IM_TX_EMPTY_INT; 949 950 SMC_SELECT_BANK(0); 951 card_stats = inw(BASE + COUNTER_REG_W); 952 953 /* 954 * Single collisions 955 */ 956 sc->arpcom.ac_if.if_collisions += card_stats & ECR_COLN_MASK; 957 958 /* 959 * Multiple collisions 960 */ 961 sc->arpcom.ac_if.if_collisions += (card_stats & ECR_MCOLN_MASK) >> 4; 962 963 SMC_SELECT_BANK(2); 964 965 /* 966 * Attempt to enqueue some more stuff. 967 */ 968 sc->arpcom.ac_if.if_flags &= ~IFF_OACTIVE; 969 snstart(&sc->arpcom.ac_if); 970 } 971 /* 972 * Some other error. Try to fix it by resetting the adapter. 973 */ 974 if (status & IM_EPH_INT) { 975 snstop(sc); 976 sninit(sc); 977 } 978 979 out: 980 /* 981 * Handled all interrupt sources. 982 */ 983 984 SMC_SELECT_BANK(2); 985 986 /* 987 * Reestablish interrupts from mask which have not been deselected 988 * during this interrupt. Note that the hardware mask, which was set 989 * to 0x00 at the start of this service routine, may have been 990 * updated by one or more of the interrupt handers and we must let 991 * those new interrupts stay enabled here. 992 */ 993 mask |= inb(BASE + INTR_MASK_REG_B); 994 outb(BASE + INTR_MASK_REG_B, mask); 995 sc->intr_mask = mask; 996 997 splx(x); 998 } 999 1000 void 1001 snread(struct ifnet *ifp) 1002 { 1003 struct sn_softc *sc = ifp->if_softc; 1004 struct mbuf *m; 1005 short status; 1006 int packet_number; 1007 u_short packet_length; 1008 u_char *data; 1009 1010 SMC_SELECT_BANK(2); 1011 #if 0 1012 packet_number = inw(BASE + FIFO_PORTS_REG_W); 1013 1014 if (packet_number & FIFO_REMPTY) { 1015 1016 /* 1017 * we got called , but nothing was on the FIFO 1018 */ 1019 printf("sn: Receive interrupt with nothing on FIFO\n"); 1020 return; 1021 } 1022 #endif 1023 read_another: 1024 1025 /* 1026 * Start reading from the start of the packet. Since PTR_RCV is set, 1027 * packet number is found in FIFO_PORTS_REG_W, FIFO_RX_MASK. 1028 */ 1029 outw(BASE + POINTER_REG_W, PTR_READ | PTR_RCV | PTR_AUTOINC | 0x0000); 1030 1031 /* 1032 * First two words are status and packet_length 1033 */ 1034 status = inw(BASE + DATA_REG_W); 1035 packet_length = inw(BASE + DATA_REG_W) & RLEN_MASK; 1036 1037 /* 1038 * The packet length contains 3 extra words: status, length, and a 1039 * extra word with the control byte. 1040 */ 1041 packet_length -= 6; 1042 1043 /* 1044 * Account for receive errors and discard. 1045 */ 1046 if (status & RS_ERRORS) { 1047 ++ifp->if_ierrors; 1048 goto out; 1049 } 1050 /* 1051 * A packet is received. 1052 */ 1053 1054 /* 1055 * Adjust for odd-length packet. 1056 */ 1057 if (status & RS_ODDFRAME) 1058 packet_length++; 1059 1060 /* 1061 * Allocate a header mbuf from the kernel. 1062 */ 1063 MGETHDR(m, MB_DONTWAIT, MT_DATA); 1064 if (m == NULL) 1065 goto out; 1066 1067 m->m_pkthdr.rcvif = ifp; 1068 m->m_pkthdr.len = m->m_len = packet_length; 1069 1070 /* 1071 * Attach an mbuf cluster 1072 */ 1073 MCLGET(m, MB_DONTWAIT); 1074 1075 /* 1076 * Insist on getting a cluster 1077 */ 1078 if ((m->m_flags & M_EXT) == 0) { 1079 m_freem(m); 1080 ++ifp->if_ierrors; 1081 printf("sn: snread() kernel memory allocation problem\n"); 1082 goto out; 1083 } 1084 1085 /* 1086 * Get packet, including link layer address, from interface. 1087 */ 1088 1089 data = mtod(m, u_char *); 1090 insw(BASE + DATA_REG_W, data, packet_length >> 1); 1091 if (packet_length & 1) { 1092 data += packet_length & ~1; 1093 *data = inb(BASE + DATA_REG_B); 1094 } 1095 ++ifp->if_ipackets; 1096 1097 m->m_pkthdr.len = m->m_len = packet_length; 1098 1099 (*ifp->if_input)(ifp, m); 1100 1101 out: 1102 1103 /* 1104 * Error or good, tell the card to get rid of this packet Wait for 1105 * the MMU to be un-busy. 1106 */ 1107 SMC_SELECT_BANK(2); 1108 while (inw(BASE + MMU_CMD_REG_W) & MMUCR_BUSY) /* NOTHING */ 1109 ; 1110 outw(BASE + MMU_CMD_REG_W, MMUCR_RELEASE); 1111 1112 /* 1113 * Check whether another packet is ready 1114 */ 1115 packet_number = inw(BASE + FIFO_PORTS_REG_W); 1116 if (packet_number & FIFO_REMPTY) { 1117 return; 1118 } 1119 goto read_another; 1120 } 1121 1122 1123 /* 1124 * Handle IOCTLS. This function is completely stolen from if_ep.c 1125 * As with its progenitor, it does not handle hardware address 1126 * changes. 1127 */ 1128 static int 1129 snioctl(struct ifnet *ifp, u_long cmd, caddr_t data, struct ucred *cr) 1130 { 1131 struct sn_softc *sc = ifp->if_softc; 1132 int s, error = 0; 1133 1134 s = splimp(); 1135 1136 switch (cmd) { 1137 case SIOCSIFADDR: 1138 case SIOCGIFADDR: 1139 case SIOCSIFMTU: 1140 error = ether_ioctl(ifp, cmd, data); 1141 break; 1142 1143 case SIOCSIFFLAGS: 1144 if ((ifp->if_flags & IFF_UP) == 0 && ifp->if_flags & IFF_RUNNING) { 1145 ifp->if_flags &= ~IFF_RUNNING; 1146 snstop(sc); 1147 break; 1148 } else { 1149 /* reinitialize card on any parameter change */ 1150 sninit(sc); 1151 break; 1152 } 1153 break; 1154 1155 #ifdef notdef 1156 case SIOCGHWADDR: 1157 bcopy((caddr_t) sc->sc_addr, (caddr_t) & ifr->ifr_data, 1158 sizeof(sc->sc_addr)); 1159 break; 1160 #endif 1161 1162 case SIOCADDMULTI: 1163 /* update multicast filter list. */ 1164 sn_setmcast(sc); 1165 error = 0; 1166 break; 1167 case SIOCDELMULTI: 1168 /* update multicast filter list. */ 1169 sn_setmcast(sc); 1170 error = 0; 1171 break; 1172 default: 1173 error = EINVAL; 1174 } 1175 1176 splx(s); 1177 1178 return (error); 1179 } 1180 1181 void 1182 snreset(struct sn_softc *sc) 1183 { 1184 int s; 1185 1186 s = splimp(); 1187 snstop(sc); 1188 sninit(sc); 1189 1190 splx(s); 1191 } 1192 1193 void 1194 snwatchdog(struct ifnet *ifp) 1195 { 1196 int s; 1197 s = splimp(); 1198 sn_intr(ifp->if_softc); 1199 splx(s); 1200 } 1201 1202 1203 /* 1. zero the interrupt mask 1204 * 2. clear the enable receive flag 1205 * 3. clear the enable xmit flags 1206 */ 1207 void 1208 snstop(struct sn_softc *sc) 1209 { 1210 1211 struct ifnet *ifp = &sc->arpcom.ac_if; 1212 1213 /* 1214 * Clear interrupt mask; disable all interrupts. 1215 */ 1216 SMC_SELECT_BANK(2); 1217 outb(BASE + INTR_MASK_REG_B, 0x00); 1218 1219 /* 1220 * Disable transmitter and Receiver 1221 */ 1222 SMC_SELECT_BANK(0); 1223 outw(BASE + RECV_CONTROL_REG_W, 0x0000); 1224 outw(BASE + TXMIT_CONTROL_REG_W, 0x0000); 1225 1226 /* 1227 * Cancel watchdog. 1228 */ 1229 ifp->if_timer = 0; 1230 } 1231 1232 1233 int 1234 sn_activate(device_t dev) 1235 { 1236 struct sn_softc *sc = device_get_softc(dev); 1237 int err; 1238 1239 sc->port_rid = 0; 1240 sc->port_res = bus_alloc_resource(dev, SYS_RES_IOPORT, &sc->port_rid, 1241 0, ~0, SMC_IO_EXTENT, RF_ACTIVE); 1242 if (!sc->port_res) { 1243 #ifdef SN_DEBUG 1244 device_printf(dev, "Cannot allocate ioport\n"); 1245 #endif 1246 return ENOMEM; 1247 } 1248 1249 sc->irq_rid = 0; 1250 sc->irq_res = bus_alloc_resource(dev, SYS_RES_IRQ, &sc->irq_rid, 1251 0, ~0, 1, RF_ACTIVE); 1252 if (!sc->irq_res) { 1253 #ifdef SN_DEBUG 1254 device_printf(dev, "Cannot allocate irq\n"); 1255 #endif 1256 sn_deactivate(dev); 1257 return ENOMEM; 1258 } 1259 if ((err = bus_setup_intr(dev, sc->irq_res, INTR_TYPE_NET, sn_intr, sc, 1260 &sc->intrhand)) != 0) { 1261 sn_deactivate(dev); 1262 return err; 1263 } 1264 1265 sc->sn_io_addr = rman_get_start(sc->port_res); 1266 return (0); 1267 } 1268 1269 void 1270 sn_deactivate(device_t dev) 1271 { 1272 struct sn_softc *sc = device_get_softc(dev); 1273 1274 if (sc->intrhand) 1275 bus_teardown_intr(dev, sc->irq_res, sc->intrhand); 1276 sc->intrhand = 0; 1277 if (sc->port_res) 1278 bus_release_resource(dev, SYS_RES_IOPORT, sc->port_rid, 1279 sc->port_res); 1280 sc->port_res = 0; 1281 if (sc->irq_res) 1282 bus_release_resource(dev, SYS_RES_IRQ, sc->irq_rid, 1283 sc->irq_res); 1284 sc->irq_res = 0; 1285 return; 1286 } 1287 1288 /* 1289 * Function: sn_probe( device_t dev, int pccard ) 1290 * 1291 * Purpose: 1292 * Tests to see if a given ioaddr points to an SMC9xxx chip. 1293 * Tries to cause as little damage as possible if it's not a SMC chip. 1294 * Returns a 0 on success 1295 * 1296 * Algorithm: 1297 * (1) see if the high byte of BANK_SELECT is 0x33 1298 * (2) compare the ioaddr with the base register's address 1299 * (3) see if I recognize the chip ID in the appropriate register 1300 * 1301 * 1302 */ 1303 int 1304 sn_probe(device_t dev, int pccard) 1305 { 1306 struct sn_softc *sc = device_get_softc(dev); 1307 u_int bank; 1308 u_short revision_register; 1309 u_short base_address_register; 1310 u_short ioaddr; 1311 int err; 1312 1313 if ((err = sn_activate(dev)) != 0) 1314 return err; 1315 1316 ioaddr = sc->sn_io_addr; 1317 1318 /* 1319 * First, see if the high byte is 0x33 1320 */ 1321 bank = inw(ioaddr + BANK_SELECT_REG_W); 1322 if ((bank & BSR_DETECT_MASK) != BSR_DETECT_VALUE) { 1323 #ifdef SN_DEBUG 1324 device_printf(dev, "test1 failed\n"); 1325 #endif 1326 goto error; 1327 } 1328 /* 1329 * The above MIGHT indicate a device, but I need to write to further 1330 * test this. Go to bank 0, then test that the register still 1331 * reports the high byte is 0x33. 1332 */ 1333 outw(ioaddr + BANK_SELECT_REG_W, 0x0000); 1334 bank = inw(ioaddr + BANK_SELECT_REG_W); 1335 if ((bank & BSR_DETECT_MASK) != BSR_DETECT_VALUE) { 1336 #ifdef SN_DEBUG 1337 device_printf(dev, "test2 failed\n"); 1338 #endif 1339 goto error; 1340 } 1341 /* 1342 * well, we've already written once, so hopefully another time won't 1343 * hurt. This time, I need to switch the bank register to bank 1, so 1344 * I can access the base address register. The contents of the 1345 * BASE_ADDR_REG_W register, after some jiggery pokery, is expected 1346 * to match the I/O port address where the adapter is being probed. 1347 */ 1348 outw(ioaddr + BANK_SELECT_REG_W, 0x0001); 1349 base_address_register = inw(ioaddr + BASE_ADDR_REG_W); 1350 1351 /* 1352 * This test is nonsence on PC-card architecture, so if 1353 * pccard == 1, skip this test. (hosokawa) 1354 */ 1355 if (!pccard && (ioaddr != (base_address_register >> 3 & 0x3E0))) { 1356 1357 /* 1358 * Well, the base address register didn't match. Must not 1359 * have been a SMC chip after all. 1360 */ 1361 /* 1362 * printf("sn: ioaddr %x doesn't match card configuration 1363 * (%x)\n", ioaddr, base_address_register >> 3 & 0x3E0 ); 1364 */ 1365 1366 #ifdef SN_DEBUG 1367 device_printf(dev, "test3 failed ioaddr = 0x%x, " 1368 "base_address_register = 0x%x\n", ioaddr, 1369 base_address_register >> 3 & 0x3E0); 1370 #endif 1371 goto error; 1372 } 1373 /* 1374 * Check if the revision register is something that I recognize. 1375 * These might need to be added to later, as future revisions could 1376 * be added. 1377 */ 1378 outw(ioaddr + BANK_SELECT_REG_W, 0x3); 1379 revision_register = inw(ioaddr + REVISION_REG_W); 1380 if (!chip_ids[(revision_register >> 4) & 0xF]) { 1381 1382 /* 1383 * I don't regonize this chip, so... 1384 */ 1385 #ifdef SN_DEBUG 1386 device_printf(dev, "test4 failed\n"); 1387 #endif 1388 goto error; 1389 } 1390 /* 1391 * at this point I'll assume that the chip is an SMC9xxx. It might be 1392 * prudent to check a listing of MAC addresses against the hardware 1393 * address, or do some other tests. 1394 */ 1395 sn_deactivate(dev); 1396 return 0; 1397 error: 1398 sn_deactivate(dev); 1399 return ENXIO; 1400 } 1401 1402 #define MCFSZ 8 1403 1404 static void 1405 sn_setmcast(struct sn_softc *sc) 1406 { 1407 struct ifnet *ifp = (struct ifnet *)sc; 1408 int flags; 1409 1410 /* 1411 * Set the receiver filter. We want receive enabled and auto strip 1412 * of CRC from received packet. If we are promiscuous then set that 1413 * bit too. 1414 */ 1415 flags = RCR_ENABLE | RCR_STRIP_CRC; 1416 1417 if (ifp->if_flags & IFF_PROMISC) { 1418 flags |= RCR_PROMISC | RCR_ALMUL; 1419 } else if (ifp->if_flags & IFF_ALLMULTI) { 1420 flags |= RCR_ALMUL; 1421 } else { 1422 u_char mcf[MCFSZ]; 1423 if (sn_getmcf(&sc->arpcom, mcf)) { 1424 /* set filter */ 1425 SMC_SELECT_BANK(3); 1426 outw(BASE + MULTICAST1_REG_W, 1427 ((u_short)mcf[1] << 8) | mcf[0]); 1428 outw(BASE + MULTICAST2_REG_W, 1429 ((u_short)mcf[3] << 8) | mcf[2]); 1430 outw(BASE + MULTICAST3_REG_W, 1431 ((u_short)mcf[5] << 8) | mcf[4]); 1432 outw(BASE + MULTICAST4_REG_W, 1433 ((u_short)mcf[7] << 8) | mcf[6]); 1434 } else { 1435 flags |= RCR_ALMUL; 1436 } 1437 } 1438 SMC_SELECT_BANK(0); 1439 outw(BASE + RECV_CONTROL_REG_W, flags); 1440 } 1441 1442 static int 1443 sn_getmcf(struct arpcom *ac, u_char *mcf) 1444 { 1445 int i; 1446 u_int index, index2; 1447 u_char *af = (u_char *) mcf; 1448 struct ifmultiaddr *ifma; 1449 1450 bzero(mcf, MCFSZ); 1451 1452 for (ifma = ac->ac_if.if_multiaddrs.lh_first; ifma; 1453 ifma = ifma->ifma_link.le_next) { 1454 if (ifma->ifma_addr->sa_family != AF_LINK) 1455 return 0; 1456 index = smc_crc(LLADDR((struct sockaddr_dl *)ifma->ifma_addr)) & 0x3f; 1457 index2 = 0; 1458 for (i = 0; i < 6; i++) { 1459 index2 <<= 1; 1460 index2 |= (index & 0x01); 1461 index >>= 1; 1462 } 1463 af[index2 >> 3] |= 1 << (index2 & 7); 1464 } 1465 return 1; /* use multicast filter */ 1466 } 1467 1468 static u_int 1469 smc_crc(u_char *s) 1470 { 1471 int perByte; 1472 int perBit; 1473 const u_int poly = 0xedb88320; 1474 u_int v = 0xffffffff; 1475 u_char c; 1476 1477 for (perByte = 0; perByte < ETHER_ADDR_LEN; perByte++) { 1478 c = s[perByte]; 1479 for (perBit = 0; perBit < 8; perBit++) { 1480 v = (v >> 1)^(((v ^ c) & 0x01) ? poly : 0); 1481 c >>= 1; 1482 } 1483 } 1484 return v; 1485 } 1486