1 /* $NetBSD: if_mc.c,v 1.19 2002/01/16 06:00:37 thorpej Exp $ */ 2 3 /*- 4 * Copyright (c) 1997 David Huang <khym@bga.com> 5 * All rights reserved. 6 * 7 * Portions of this code are based on code by Denton Gentry <denny1@home.com>, 8 * Charles M. Hannum, Yanagisawa Takeshi <yanagisw@aa.ap.titech.ac.jp>, and 9 * Jason R. Thorpe. 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following conditions 13 * are met: 14 * 1. Redistributions of source code must retain the above copyright 15 * notice, this list of conditions and the following disclaimer. 16 * 2. The name of the author may not be used to endorse or promote products 17 * derived from this software without specific prior written permission 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 20 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 21 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 22 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 23 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 24 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 25 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 26 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 28 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 29 * 30 */ 31 32 /* 33 * Driver for the AMD Am79C940 (MACE) ethernet chip, used for onboard 34 * ethernet on the Centris/Quadra 660av and Quadra 840av. 35 */ 36 37 #include "opt_ddb.h" 38 #include "opt_inet.h" 39 #include "opt_ccitt.h" 40 #include "opt_llc.h" 41 #include "opt_ns.h" 42 43 #include <sys/param.h> 44 #include <sys/systm.h> 45 #include <sys/mbuf.h> 46 #include <sys/buf.h> 47 #include <sys/protosw.h> 48 #include <sys/socket.h> 49 #include <sys/syslog.h> 50 #include <sys/ioctl.h> 51 #include <sys/errno.h> 52 #include <sys/device.h> 53 54 #include <net/if.h> 55 #include <net/if_dl.h> 56 #include <net/if_ether.h> 57 58 #ifdef INET 59 #include <netinet/in.h> 60 #include <netinet/if_inarp.h> 61 #include <netinet/in_systm.h> 62 #include <netinet/in_var.h> 63 #include <netinet/ip.h> 64 #endif 65 66 #ifdef NS 67 #include <netns/ns.h> 68 #include <netns/ns_if.h> 69 #endif 70 71 #if defined(CCITT) && defined(LLC) 72 #include <sys/socketvar.h> 73 #include <netccitt/x25.h> 74 #include <netccitt/pk.h> 75 #include <netccitt/pk_var.h> 76 #include <netccitt/pk_extern.h> 77 #endif 78 79 #include <uvm/uvm_extern.h> 80 81 #include "bpfilter.h" 82 #if NBPFILTER > 0 83 #include <net/bpf.h> 84 #include <net/bpfdesc.h> 85 #endif 86 87 #include <machine/bus.h> 88 #include <mac68k/dev/if_mcreg.h> 89 #include <mac68k/dev/if_mcvar.h> 90 91 hide void mcwatchdog __P((struct ifnet *)); 92 hide int mcinit __P((struct mc_softc *sc)); 93 hide int mcstop __P((struct mc_softc *sc)); 94 hide int mcioctl __P((struct ifnet *ifp, u_long cmd, caddr_t data)); 95 hide void mcstart __P((struct ifnet *ifp)); 96 hide void mcreset __P((struct mc_softc *sc)); 97 98 integrate u_int maceput __P((struct mc_softc *sc, struct mbuf *m0)); 99 integrate void mc_tint __P((struct mc_softc *sc)); 100 integrate void mace_read __P((struct mc_softc *, caddr_t, int)); 101 integrate struct mbuf *mace_get __P((struct mc_softc *, caddr_t, int)); 102 static void mace_calcladrf __P((struct ethercom *ac, u_int8_t *af)); 103 static inline u_int16_t ether_cmp __P((void *, void *)); 104 105 106 /* 107 * Compare two Ether/802 addresses for equality, inlined and 108 * unrolled for speed. Use this like bcmp(). 109 * 110 * XXX: Add <machine/inlines.h> for stuff like this? 111 * XXX: or maybe add it to libkern.h instead? 112 * 113 * "I'd love to have an inline assembler version of this." 114 * XXX: Who wanted that? mycroft? I wrote one, but this 115 * version in C is as good as hand-coded assembly. -gwr 116 * 117 * Please do NOT tweak this without looking at the actual 118 * assembly code generated before and after your tweaks! 119 */ 120 static inline u_int16_t 121 ether_cmp(one, two) 122 void *one, *two; 123 { 124 register u_int16_t *a = (u_short *) one; 125 register u_int16_t *b = (u_short *) two; 126 register u_int16_t diff; 127 128 #ifdef m68k 129 /* 130 * The post-increment-pointer form produces the best 131 * machine code for m68k. This was carefully tuned 132 * so it compiles to just 8 short (2-byte) op-codes! 133 */ 134 diff = *a++ - *b++; 135 diff |= *a++ - *b++; 136 diff |= *a++ - *b++; 137 #else 138 /* 139 * Most modern CPUs do better with a single expresion. 140 * Note that short-cut evaluation is NOT helpful here, 141 * because it just makes the code longer, not faster! 142 */ 143 diff = (a[0] - b[0]) | (a[1] - b[1]) | (a[2] - b[2]); 144 #endif 145 146 return (diff); 147 } 148 149 #define ETHER_CMP ether_cmp 150 151 /* 152 * Interface exists: make available by filling in network interface 153 * record. System will initialize the interface when it is ready 154 * to accept packets. 155 */ 156 int 157 mcsetup(sc, lladdr) 158 struct mc_softc *sc; 159 u_int8_t *lladdr; 160 { 161 struct ifnet *ifp = &sc->sc_if; 162 163 /* reset the chip and disable all interrupts */ 164 NIC_PUT(sc, MACE_BIUCC, SWRST); 165 DELAY(100); 166 NIC_PUT(sc, MACE_IMR, ~0); 167 168 bcopy(lladdr, sc->sc_enaddr, ETHER_ADDR_LEN); 169 printf(": address %s\n", ether_sprintf(lladdr)); 170 171 bcopy(sc->sc_dev.dv_xname, ifp->if_xname, IFNAMSIZ); 172 ifp->if_softc = sc; 173 ifp->if_ioctl = mcioctl; 174 ifp->if_start = mcstart; 175 ifp->if_flags = 176 IFF_BROADCAST | IFF_SIMPLEX | IFF_NOTRAILERS | IFF_MULTICAST; 177 ifp->if_watchdog = mcwatchdog; 178 179 if_attach(ifp); 180 ether_ifattach(ifp, lladdr); 181 182 return (0); 183 } 184 185 hide int 186 mcioctl(ifp, cmd, data) 187 struct ifnet *ifp; 188 u_long cmd; 189 caddr_t data; 190 { 191 struct mc_softc *sc = ifp->if_softc; 192 struct ifaddr *ifa; 193 struct ifreq *ifr; 194 195 int s = splnet(), err = 0; 196 int temp; 197 198 switch (cmd) { 199 200 case SIOCSIFADDR: 201 ifa = (struct ifaddr *)data; 202 ifp->if_flags |= IFF_UP; 203 switch (ifa->ifa_addr->sa_family) { 204 #ifdef INET 205 case AF_INET: 206 mcinit(sc); 207 arp_ifinit(ifp, ifa); 208 break; 209 #endif 210 #ifdef NS 211 case AF_NS: 212 { 213 register struct ns_addr *ina = &IA_SNS(ifa)->sns_addr; 214 215 if (ns_nullhost(*ina)) 216 ina->x_host = 217 *(union ns_host *)LLADDR(ifp->if_sadl); 218 else { 219 bcopy(ina->x_host.c_host, 220 LLADDR(ifp->if_sadl), 221 sizeof(sc->sc_enaddr)); 222 } 223 /* Set new address. */ 224 mcinit(sc); 225 break; 226 } 227 #endif 228 default: 229 mcinit(sc); 230 break; 231 } 232 break; 233 234 case SIOCSIFFLAGS: 235 if ((ifp->if_flags & IFF_UP) == 0 && 236 (ifp->if_flags & IFF_RUNNING) != 0) { 237 /* 238 * If interface is marked down and it is running, 239 * then stop it. 240 */ 241 mcstop(sc); 242 ifp->if_flags &= ~IFF_RUNNING; 243 } else if ((ifp->if_flags & IFF_UP) != 0 && 244 (ifp->if_flags & IFF_RUNNING) == 0) { 245 /* 246 * If interface is marked up and it is stopped, 247 * then start it. 248 */ 249 (void)mcinit(sc); 250 } else { 251 /* 252 * reset the interface to pick up any other changes 253 * in flags 254 */ 255 temp = ifp->if_flags & IFF_UP; 256 mcreset(sc); 257 ifp->if_flags |= temp; 258 mcstart(ifp); 259 } 260 break; 261 262 case SIOCADDMULTI: 263 case SIOCDELMULTI: 264 ifr = (struct ifreq *) data; 265 err = (cmd == SIOCADDMULTI) ? 266 ether_addmulti(ifr, &sc->sc_ethercom) : 267 ether_delmulti(ifr, &sc->sc_ethercom); 268 269 if (err == ENETRESET) { 270 /* 271 * Multicast list has changed; set the hardware 272 * filter accordingly. But remember UP flag! 273 */ 274 temp = ifp->if_flags & IFF_UP; 275 mcreset(sc); 276 ifp->if_flags |= temp; 277 err = 0; 278 } 279 break; 280 default: 281 err = EINVAL; 282 } 283 splx(s); 284 return (err); 285 } 286 287 /* 288 * Encapsulate a packet of type family for the local net. 289 */ 290 hide void 291 mcstart(ifp) 292 struct ifnet *ifp; 293 { 294 struct mc_softc *sc = ifp->if_softc; 295 struct mbuf *m; 296 297 if ((ifp->if_flags & (IFF_RUNNING | IFF_OACTIVE)) != IFF_RUNNING) 298 return; 299 300 while (1) { 301 if (ifp->if_flags & IFF_OACTIVE) 302 return; 303 304 IF_DEQUEUE(&ifp->if_snd, m); 305 if (m == 0) 306 return; 307 308 #if NBPFILTER > 0 309 /* 310 * If bpf is listening on this interface, let it 311 * see the packet before we commit it to the wire. 312 */ 313 if (ifp->if_bpf) 314 bpf_mtap(ifp->if_bpf, m); 315 #endif 316 317 /* 318 * Copy the mbuf chain into the transmit buffer. 319 */ 320 ifp->if_flags |= IFF_OACTIVE; 321 maceput(sc, m); 322 323 ifp->if_opackets++; /* # of pkts */ 324 } 325 } 326 327 /* 328 * reset and restart the MACE. Called in case of fatal 329 * hardware/software errors. 330 */ 331 hide void 332 mcreset(sc) 333 struct mc_softc *sc; 334 { 335 mcstop(sc); 336 mcinit(sc); 337 } 338 339 hide int 340 mcinit(sc) 341 struct mc_softc *sc; 342 { 343 int s; 344 u_int8_t maccc, ladrf[8]; 345 346 if (sc->sc_if.if_flags & IFF_RUNNING) 347 /* already running */ 348 return (0); 349 350 s = splnet(); 351 352 NIC_PUT(sc, MACE_BIUCC, sc->sc_biucc); 353 NIC_PUT(sc, MACE_FIFOCC, sc->sc_fifocc); 354 NIC_PUT(sc, MACE_IMR, ~0); /* disable all interrupts */ 355 NIC_PUT(sc, MACE_PLSCC, sc->sc_plscc); 356 357 NIC_PUT(sc, MACE_UTR, RTRD); /* disable reserved test registers */ 358 359 /* set MAC address */ 360 NIC_PUT(sc, MACE_IAC, ADDRCHG); 361 while (NIC_GET(sc, MACE_IAC) & ADDRCHG) 362 ; 363 NIC_PUT(sc, MACE_IAC, PHYADDR); 364 bus_space_write_multi_1(sc->sc_regt, sc->sc_regh, MACE_REG(MACE_PADR), 365 sc->sc_enaddr, ETHER_ADDR_LEN); 366 367 /* set logical address filter */ 368 mace_calcladrf(&sc->sc_ethercom, ladrf); 369 370 NIC_PUT(sc, MACE_IAC, ADDRCHG); 371 while (NIC_GET(sc, MACE_IAC) & ADDRCHG) 372 ; 373 NIC_PUT(sc, MACE_IAC, LOGADDR); 374 bus_space_write_multi_1(sc->sc_regt, sc->sc_regh, MACE_REG(MACE_LADRF), 375 ladrf, 8); 376 377 NIC_PUT(sc, MACE_XMTFC, APADXMT); 378 /* 379 * No need to autostrip padding on receive... Ethernet frames 380 * don't have a length field, unlike 802.3 frames, so the MACE 381 * can't figure out the length of the packet anyways. 382 */ 383 NIC_PUT(sc, MACE_RCVFC, 0); 384 385 maccc = ENXMT | ENRCV; 386 if (sc->sc_if.if_flags & IFF_PROMISC) 387 maccc |= PROM; 388 389 NIC_PUT(sc, MACE_MACCC, maccc); 390 391 if (sc->sc_bus_init) 392 (*sc->sc_bus_init)(sc); 393 394 /* 395 * Enable all interrupts except receive, since we use the DMA 396 * completion interrupt for that. 397 */ 398 NIC_PUT(sc, MACE_IMR, RCVINTM); 399 400 /* flag interface as "running" */ 401 sc->sc_if.if_flags |= IFF_RUNNING; 402 sc->sc_if.if_flags &= ~IFF_OACTIVE; 403 404 splx(s); 405 return (0); 406 } 407 408 /* 409 * close down an interface and free its buffers 410 * Called on final close of device, or if mcinit() fails 411 * part way through. 412 */ 413 hide int 414 mcstop(sc) 415 struct mc_softc *sc; 416 { 417 int s = splnet(); 418 419 NIC_PUT(sc, MACE_BIUCC, SWRST); 420 DELAY(100); 421 422 sc->sc_if.if_timer = 0; 423 sc->sc_if.if_flags &= ~(IFF_RUNNING | IFF_UP); 424 425 splx(s); 426 return (0); 427 } 428 429 /* 430 * Called if any Tx packets remain unsent after 5 seconds, 431 * In all cases we just reset the chip, and any retransmission 432 * will be handled by higher level protocol timeouts. 433 */ 434 hide void 435 mcwatchdog(ifp) 436 struct ifnet *ifp; 437 { 438 struct mc_softc *sc = ifp->if_softc; 439 int temp; 440 441 printf("mcwatchdog: resetting chip\n"); 442 temp = ifp->if_flags & IFF_UP; 443 mcreset(sc); 444 ifp->if_flags |= temp; 445 } 446 447 /* 448 * stuff packet into MACE (at splnet) 449 */ 450 integrate u_int 451 maceput(sc, m) 452 struct mc_softc *sc; 453 struct mbuf *m; 454 { 455 struct mbuf *n; 456 u_int len, totlen = 0; 457 u_char *buff; 458 459 buff = sc->sc_txbuf; 460 461 for (; m; m = n) { 462 u_char *data = mtod(m, u_char *); 463 len = m->m_len; 464 totlen += len; 465 bcopy(data, buff, len); 466 buff += len; 467 MFREE(m, n); 468 } 469 470 if (totlen > NBPG) 471 panic("%s: maceput: packet overflow", sc->sc_dev.dv_xname); 472 473 #if 0 474 if (totlen < ETHERMIN + sizeof(struct ether_header)) { 475 int pad = ETHERMIN + sizeof(struct ether_header) - totlen; 476 bzero(sc->sc_txbuf + totlen, pad); 477 totlen = ETHERMIN + sizeof(struct ether_header); 478 } 479 #endif 480 481 (*sc->sc_putpacket)(sc, totlen); 482 483 sc->sc_if.if_timer = 5; /* 5 seconds to watch for failing to transmit */ 484 return (totlen); 485 } 486 487 void 488 mcintr(arg) 489 void *arg; 490 { 491 struct mc_softc *sc = arg; 492 u_int8_t ir; 493 494 ir = NIC_GET(sc, MACE_IR) & ~NIC_GET(sc, MACE_IMR); 495 if (ir & JAB) { 496 #ifdef MCDEBUG 497 printf("%s: jabber error\n", sc->sc_dev.dv_xname); 498 #endif 499 sc->sc_if.if_oerrors++; 500 } 501 502 if (ir & BABL) { 503 #ifdef MCDEBUG 504 printf("%s: babble\n", sc->sc_dev.dv_xname); 505 #endif 506 sc->sc_if.if_oerrors++; 507 } 508 509 if (ir & CERR) { 510 #ifdef MCDEBUG 511 printf("%s: collision error\n", sc->sc_dev.dv_xname); 512 #endif 513 sc->sc_if.if_collisions++; 514 } 515 516 /* 517 * Pretend we have carrier; if we don't this will be cleared 518 * shortly. 519 */ 520 sc->sc_havecarrier = 1; 521 522 if (ir & XMTINT) 523 mc_tint(sc); 524 525 if (ir & RCVINT) 526 mc_rint(sc); 527 } 528 529 integrate void 530 mc_tint(sc) 531 struct mc_softc *sc; 532 { 533 u_int8_t xmtrc, xmtfs; 534 535 xmtrc = NIC_GET(sc, MACE_XMTRC); 536 xmtfs = NIC_GET(sc, MACE_XMTFS); 537 538 if ((xmtfs & XMTSV) == 0) 539 return; 540 541 if (xmtfs & UFLO) { 542 printf("%s: underflow\n", sc->sc_dev.dv_xname); 543 mcreset(sc); 544 return; 545 } 546 547 if (xmtfs & LCOL) { 548 printf("%s: late collision\n", sc->sc_dev.dv_xname); 549 sc->sc_if.if_oerrors++; 550 sc->sc_if.if_collisions++; 551 } 552 553 if (xmtfs & MORE) 554 /* Real number is unknown. */ 555 sc->sc_if.if_collisions += 2; 556 else if (xmtfs & ONE) 557 sc->sc_if.if_collisions++; 558 else if (xmtfs & RTRY) { 559 printf("%s: excessive collisions\n", sc->sc_dev.dv_xname); 560 sc->sc_if.if_collisions += 16; 561 sc->sc_if.if_oerrors++; 562 } 563 564 if (xmtfs & LCAR) { 565 sc->sc_havecarrier = 0; 566 printf("%s: lost carrier\n", sc->sc_dev.dv_xname); 567 sc->sc_if.if_oerrors++; 568 } 569 570 sc->sc_if.if_flags &= ~IFF_OACTIVE; 571 sc->sc_if.if_timer = 0; 572 mcstart(&sc->sc_if); 573 } 574 575 void 576 mc_rint(sc) 577 struct mc_softc *sc; 578 { 579 #define rxf sc->sc_rxframe 580 u_int len; 581 582 len = (rxf.rx_rcvcnt | ((rxf.rx_rcvsts & 0xf) << 8)) - 4; 583 584 #ifdef MCDEBUG 585 if (rxf.rx_rcvsts & 0xf0) 586 printf("%s: rcvcnt %02x rcvsts %02x rntpc 0x%02x rcvcc 0x%02x\n", 587 sc->sc_dev.dv_xname, rxf.rx_rcvcnt, rxf.rx_rcvsts, 588 rxf.rx_rntpc, rxf.rx_rcvcc); 589 #endif 590 591 if (rxf.rx_rcvsts & OFLO) { 592 printf("%s: receive FIFO overflow\n", sc->sc_dev.dv_xname); 593 sc->sc_if.if_ierrors++; 594 return; 595 } 596 597 if (rxf.rx_rcvsts & CLSN) 598 sc->sc_if.if_collisions++; 599 600 if (rxf.rx_rcvsts & FRAM) { 601 #ifdef MCDEBUG 602 printf("%s: framing error\n", sc->sc_dev.dv_xname); 603 #endif 604 sc->sc_if.if_ierrors++; 605 return; 606 } 607 608 if (rxf.rx_rcvsts & FCS) { 609 #ifdef MCDEBUG 610 printf("%s: frame control checksum error\n", sc->sc_dev.dv_xname); 611 #endif 612 sc->sc_if.if_ierrors++; 613 return; 614 } 615 616 mace_read(sc, rxf.rx_frame, len); 617 #undef rxf 618 } 619 620 integrate void 621 mace_read(sc, pkt, len) 622 struct mc_softc *sc; 623 caddr_t pkt; 624 int len; 625 { 626 struct ifnet *ifp = &sc->sc_if; 627 struct mbuf *m; 628 629 if (len <= sizeof(struct ether_header) || 630 len > ETHERMTU + sizeof(struct ether_header)) { 631 #ifdef MCDEBUG 632 printf("%s: invalid packet size %d; dropping\n", 633 sc->sc_dev.dv_xname, len); 634 #endif 635 ifp->if_ierrors++; 636 return; 637 } 638 639 m = mace_get(sc, pkt, len); 640 if (m == NULL) { 641 ifp->if_ierrors++; 642 return; 643 } 644 645 ifp->if_ipackets++; 646 647 #if NBPFILTER > 0 648 /* Pass the packet to any BPF listeners. */ 649 if (ifp->if_bpf) 650 bpf_mtap(ifp->if_bpf, m); 651 #endif 652 653 /* Pass the packet up. */ 654 (*ifp->if_input)(ifp, m); 655 } 656 657 /* 658 * Pull data off an interface. 659 * Len is length of data, with local net header stripped. 660 * We copy the data into mbufs. When full cluster sized units are present 661 * we copy into clusters. 662 */ 663 integrate struct mbuf * 664 mace_get(sc, pkt, totlen) 665 struct mc_softc *sc; 666 caddr_t pkt; 667 int totlen; 668 { 669 register struct mbuf *m; 670 struct mbuf *top, **mp; 671 int len; 672 673 MGETHDR(m, M_DONTWAIT, MT_DATA); 674 if (m == 0) 675 return (0); 676 m->m_pkthdr.rcvif = &sc->sc_if; 677 m->m_pkthdr.len = totlen; 678 len = MHLEN; 679 top = 0; 680 mp = ⊤ 681 682 while (totlen > 0) { 683 if (top) { 684 MGET(m, M_DONTWAIT, MT_DATA); 685 if (m == 0) { 686 m_freem(top); 687 return 0; 688 } 689 len = MLEN; 690 } 691 if (totlen >= MINCLSIZE) { 692 MCLGET(m, M_DONTWAIT); 693 if ((m->m_flags & M_EXT) == 0) { 694 m_free(m); 695 m_freem(top); 696 return 0; 697 } 698 len = MCLBYTES; 699 } 700 m->m_len = len = min(totlen, len); 701 bcopy(pkt, mtod(m, caddr_t), len); 702 pkt += len; 703 totlen -= len; 704 *mp = m; 705 mp = &m->m_next; 706 } 707 708 return (top); 709 } 710 711 /* 712 * Go through the list of multicast addresses and calculate the logical 713 * address filter. 714 */ 715 void 716 mace_calcladrf(ac, af) 717 struct ethercom *ac; 718 u_int8_t *af; 719 { 720 struct ifnet *ifp = &ac->ec_if; 721 struct ether_multi *enm; 722 register u_char *cp; 723 register u_int32_t crc; 724 static const u_int32_t crctab[] = { 725 0x00000000, 0x1db71064, 0x3b6e20c8, 0x26d930ac, 726 0x76dc4190, 0x6b6b51f4, 0x4db26158, 0x5005713c, 727 0xedb88320, 0xf00f9344, 0xd6d6a3e8, 0xcb61b38c, 728 0x9b64c2b0, 0x86d3d2d4, 0xa00ae278, 0xbdbdf21c 729 }; 730 register int len; 731 struct ether_multistep step; 732 733 /* 734 * Set up multicast address filter by passing all multicast addresses 735 * through a crc generator, and then using the high order 6 bits as an 736 * index into the 64 bit logical address filter. The high order bit 737 * selects the word, while the rest of the bits select the bit within 738 * the word. 739 */ 740 741 *((u_int32_t *)af) = *((u_int32_t *)af + 1) = 0; 742 ETHER_FIRST_MULTI(step, ac, enm); 743 while (enm != NULL) { 744 if (ETHER_CMP(enm->enm_addrlo, enm->enm_addrhi)) { 745 /* 746 * We must listen to a range of multicast addresses. 747 * For now, just accept all multicasts, rather than 748 * trying to set only those filter bits needed to match 749 * the range. (At this time, the only use of address 750 * ranges is for IP multicast routing, for which the 751 * range is big enough to require all bits set.) 752 */ 753 goto allmulti; 754 } 755 756 cp = enm->enm_addrlo; 757 crc = 0xffffffff; 758 for (len = sizeof(enm->enm_addrlo); --len >= 0;) { 759 crc ^= *cp++; 760 crc = (crc >> 4) ^ crctab[crc & 0xf]; 761 crc = (crc >> 4) ^ crctab[crc & 0xf]; 762 } 763 /* Just want the 6 most significant bits. */ 764 crc >>= 26; 765 766 /* Set the corresponding bit in the filter. */ 767 af[crc >> 3] |= 1 << (crc & 7); 768 769 ETHER_NEXT_MULTI(step, enm); 770 } 771 ifp->if_flags &= ~IFF_ALLMULTI; 772 return; 773 774 allmulti: 775 ifp->if_flags |= IFF_ALLMULTI; 776 *((u_int32_t *)af) = *((u_int32_t *)af + 1) = 0xffffffff; 777 } 778 779 static u_char bbr4[] = {0,8,4,12,2,10,6,14,1,9,5,13,3,11,7,15}; 780 #define bbr(v) ((bbr4[(v)&0xf] << 4) | bbr4[((v)>>4) & 0xf]) 781 782 u_char 783 mc_get_enaddr(t, h, o, dst) 784 bus_space_tag_t t; 785 bus_space_handle_t h; 786 bus_size_t o; 787 u_char *dst; 788 { 789 int i; 790 u_char b, csum; 791 792 /* 793 * The XOR of the 8 bytes of the ROM must be 0xff for it to be 794 * valid 795 */ 796 for (i = 0, csum = 0; i < 8; i++) { 797 b = bus_space_read_1(t, h, o+16*i); 798 if (i < ETHER_ADDR_LEN) 799 dst[i] = bbr(b); 800 csum ^= b; 801 } 802 803 return csum; 804 } 805