lance.c revision 1.25.2.2
1 /* $NetBSD: lance.c,v 1.25.2.2 2002/09/06 08:44:26 jdolecek Exp $ */ 2 3 /*- 4 * Copyright (c) 1997, 1998 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Charles M. Hannum and by Jason R. Thorpe of the Numerical Aerospace 9 * Simulation Facility, NASA Ames Research Center. 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. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in the 18 * documentation and/or other materials provided with the distribution. 19 * 3. All advertising materials mentioning features or use of this software 20 * must display the following acknowledgement: 21 * This product includes software developed by the NetBSD 22 * Foundation, Inc. and its contributors. 23 * 4. Neither the name of The NetBSD Foundation nor the names of its 24 * contributors may be used to endorse or promote products derived 25 * from this software without specific prior written permission. 26 * 27 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 28 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 29 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 30 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 31 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 32 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 33 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 34 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 35 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 36 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 37 * POSSIBILITY OF SUCH DAMAGE. 38 */ 39 40 /*- 41 * Copyright (c) 1992, 1993 42 * The Regents of the University of California. All rights reserved. 43 * 44 * This code is derived from software contributed to Berkeley by 45 * Ralph Campbell and Rick Macklem. 46 * 47 * Redistribution and use in source and binary forms, with or without 48 * modification, are permitted provided that the following conditions 49 * are met: 50 * 1. Redistributions of source code must retain the above copyright 51 * notice, this list of conditions and the following disclaimer. 52 * 2. Redistributions in binary form must reproduce the above copyright 53 * notice, this list of conditions and the following disclaimer in the 54 * documentation and/or other materials provided with the distribution. 55 * 3. All advertising materials mentioning features or use of this software 56 * must display the following acknowledgement: 57 * This product includes software developed by the University of 58 * California, Berkeley and its contributors. 59 * 4. Neither the name of the University nor the names of its contributors 60 * may be used to endorse or promote products derived from this software 61 * without specific prior written permission. 62 * 63 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 64 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 65 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 66 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 67 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 68 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 69 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 70 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 71 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 72 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 73 * SUCH DAMAGE. 74 * 75 * @(#)if_le.c 8.2 (Berkeley) 11/16/93 76 */ 77 78 #include <sys/cdefs.h> 79 __KERNEL_RCSID(0, "$NetBSD: lance.c,v 1.25.2.2 2002/09/06 08:44:26 jdolecek Exp $"); 80 81 #include "opt_ccitt.h" 82 #include "opt_llc.h" 83 #include "bpfilter.h" 84 #include "rnd.h" 85 86 #include <sys/param.h> 87 #include <sys/systm.h> 88 #include <sys/mbuf.h> 89 #include <sys/syslog.h> 90 #include <sys/socket.h> 91 #include <sys/device.h> 92 #include <sys/malloc.h> 93 #include <sys/ioctl.h> 94 #include <sys/errno.h> 95 #if NRND > 0 96 #include <sys/rnd.h> 97 #endif 98 99 #include <net/if.h> 100 #include <net/if_dl.h> 101 #include <net/if_ether.h> 102 #include <net/if_media.h> 103 104 #if defined(CCITT) && defined(LLC) 105 #include <sys/socketvar.h> 106 #include <netccitt/x25.h> 107 #include <netccitt/pk.h> 108 #include <netccitt/pk_var.h> 109 #include <netccitt/pk_extern.h> 110 #endif 111 112 #if NBPFILTER > 0 113 #include <net/bpf.h> 114 #include <net/bpfdesc.h> 115 #endif 116 117 #include <dev/ic/lancereg.h> 118 #include <dev/ic/lancevar.h> 119 120 #if defined(_KERNEL_OPT) 121 #include "opt_ddb.h" 122 #endif 123 124 #ifdef DDB 125 #define integrate 126 #define hide 127 #else 128 #define integrate static __inline 129 #define hide static 130 #endif 131 132 integrate struct mbuf *lance_get __P((struct lance_softc *, int, int)); 133 134 hide void lance_shutdown __P((void *)); 135 136 int lance_mediachange __P((struct ifnet *)); 137 void lance_mediastatus __P((struct ifnet *, struct ifmediareq *)); 138 139 static inline u_int16_t ether_cmp __P((void *, void *)); 140 141 void lance_stop __P((struct ifnet *, int)); 142 int lance_ioctl __P((struct ifnet *, u_long, caddr_t)); 143 void lance_watchdog __P((struct ifnet *)); 144 145 /* 146 * Compare two Ether/802 addresses for equality, inlined and 147 * unrolled for speed. Use this like memcmp(). 148 * 149 * XXX: Add <machine/inlines.h> for stuff like this? 150 * XXX: or maybe add it to libkern.h instead? 151 * 152 * "I'd love to have an inline assembler version of this." 153 * XXX: Who wanted that? mycroft? I wrote one, but this 154 * version in C is as good as hand-coded assembly. -gwr 155 * 156 * Please do NOT tweak this without looking at the actual 157 * assembly code generated before and after your tweaks! 158 */ 159 static inline u_int16_t 160 ether_cmp(one, two) 161 void *one, *two; 162 { 163 u_int16_t *a = (u_short *) one; 164 u_int16_t *b = (u_short *) two; 165 u_int16_t diff; 166 167 #ifdef m68k 168 /* 169 * The post-increment-pointer form produces the best 170 * machine code for m68k. This was carefully tuned 171 * so it compiles to just 8 short (2-byte) op-codes! 172 */ 173 diff = *a++ - *b++; 174 diff |= *a++ - *b++; 175 diff |= *a++ - *b++; 176 #else 177 /* 178 * Most modern CPUs do better with a single expresion. 179 * Note that short-cut evaluation is NOT helpful here, 180 * because it just makes the code longer, not faster! 181 */ 182 diff = (a[0] - b[0]) | (a[1] - b[1]) | (a[2] - b[2]); 183 #endif 184 185 return (diff); 186 } 187 188 #define ETHER_CMP ether_cmp 189 190 #ifdef LANCE_REVC_BUG 191 /* Make sure this is short-aligned, for ether_cmp(). */ 192 static u_int16_t bcast_enaddr[3] = { ~0, ~0, ~0 }; 193 #endif 194 195 void 196 lance_config(sc) 197 struct lance_softc *sc; 198 { 199 int i, nbuf; 200 struct ifnet *ifp = &sc->sc_ethercom.ec_if; 201 202 /* Initialize ifnet structure. */ 203 strcpy(ifp->if_xname, sc->sc_dev.dv_xname); 204 ifp->if_softc = sc; 205 ifp->if_start = sc->sc_start; 206 ifp->if_ioctl = lance_ioctl; 207 ifp->if_watchdog = lance_watchdog; 208 ifp->if_init = lance_init; 209 ifp->if_stop = lance_stop; 210 ifp->if_flags = 211 IFF_BROADCAST | IFF_SIMPLEX | IFF_NOTRAILERS | IFF_MULTICAST; 212 #ifdef LANCE_REVC_BUG 213 ifp->if_flags &= ~IFF_MULTICAST; 214 #endif 215 IFQ_SET_READY(&ifp->if_snd); 216 217 /* Initialize ifmedia structures. */ 218 ifmedia_init(&sc->sc_media, 0, lance_mediachange, lance_mediastatus); 219 if (sc->sc_supmedia != NULL) { 220 for (i = 0; i < sc->sc_nsupmedia; i++) 221 ifmedia_add(&sc->sc_media, sc->sc_supmedia[i], 222 0, NULL); 223 ifmedia_set(&sc->sc_media, sc->sc_defaultmedia); 224 } else { 225 ifmedia_add(&sc->sc_media, IFM_ETHER|IFM_MANUAL, 0, NULL); 226 ifmedia_set(&sc->sc_media, IFM_ETHER|IFM_MANUAL); 227 } 228 229 switch (sc->sc_memsize) { 230 case 8192: 231 sc->sc_nrbuf = 4; 232 sc->sc_ntbuf = 1; 233 break; 234 case 16384: 235 sc->sc_nrbuf = 8; 236 sc->sc_ntbuf = 2; 237 break; 238 case 32768: 239 sc->sc_nrbuf = 16; 240 sc->sc_ntbuf = 4; 241 break; 242 case 65536: 243 sc->sc_nrbuf = 32; 244 sc->sc_ntbuf = 8; 245 break; 246 case 131072: 247 sc->sc_nrbuf = 64; 248 sc->sc_ntbuf = 16; 249 break; 250 case 262144: 251 sc->sc_nrbuf = 128; 252 sc->sc_ntbuf = 32; 253 break; 254 default: 255 /* weird memory size; cope with it */ 256 nbuf = sc->sc_memsize / LEBLEN; 257 sc->sc_ntbuf = nbuf / 5; 258 sc->sc_nrbuf = nbuf - sc->sc_ntbuf; 259 } 260 261 printf(": address %s\n", ether_sprintf(sc->sc_enaddr)); 262 printf("%s: %d receive buffers, %d transmit buffers\n", 263 sc->sc_dev.dv_xname, sc->sc_nrbuf, sc->sc_ntbuf); 264 265 /* Make sure the chip is stopped. */ 266 lance_stop(ifp, 0); 267 268 /* claim 802.1q capability */ 269 sc->sc_ethercom.ec_capabilities |= ETHERCAP_VLAN_MTU; 270 /* Attach the interface. */ 271 if_attach(ifp); 272 ether_ifattach(ifp, sc->sc_enaddr); 273 274 sc->sc_sh = shutdownhook_establish(lance_shutdown, ifp); 275 if (sc->sc_sh == NULL) 276 panic("lance_config: can't establish shutdownhook"); 277 sc->sc_rbufaddr = malloc(sc->sc_nrbuf * sizeof(int), M_DEVBUF, 278 M_WAITOK); 279 sc->sc_tbufaddr = malloc(sc->sc_ntbuf * sizeof(int), M_DEVBUF, 280 M_WAITOK); 281 282 #if NRND > 0 283 rnd_attach_source(&sc->rnd_source, sc->sc_dev.dv_xname, 284 RND_TYPE_NET, 0); 285 #endif 286 } 287 288 void 289 lance_reset(sc) 290 struct lance_softc *sc; 291 { 292 int s; 293 294 s = splnet(); 295 lance_init(&sc->sc_ethercom.ec_if); 296 splx(s); 297 } 298 299 void 300 lance_stop(ifp, disable) 301 struct ifnet *ifp; 302 int disable; 303 { 304 struct lance_softc *sc = ifp->if_softc; 305 306 (*sc->sc_wrcsr)(sc, LE_CSR0, LE_C0_STOP); 307 } 308 309 /* 310 * Initialization of interface; set up initialization block 311 * and transmit/receive descriptor rings. 312 */ 313 int 314 lance_init(ifp) 315 struct ifnet *ifp; 316 { 317 struct lance_softc *sc = ifp->if_softc; 318 int timo; 319 u_long a; 320 321 (*sc->sc_wrcsr)(sc, LE_CSR0, LE_C0_STOP); 322 DELAY(100); 323 324 /* Newer LANCE chips have a reset register */ 325 if (sc->sc_hwreset) 326 (*sc->sc_hwreset)(sc); 327 328 /* Set the correct byte swapping mode, etc. */ 329 (*sc->sc_wrcsr)(sc, LE_CSR3, sc->sc_conf3); 330 331 /* Set up LANCE init block. */ 332 (*sc->sc_meminit)(sc); 333 334 /* Give LANCE the physical address of its init block. */ 335 a = sc->sc_addr + LE_INITADDR(sc); 336 (*sc->sc_wrcsr)(sc, LE_CSR1, a); 337 (*sc->sc_wrcsr)(sc, LE_CSR2, a >> 16); 338 339 /* Try to initialize the LANCE. */ 340 DELAY(100); 341 (*sc->sc_wrcsr)(sc, LE_CSR0, LE_C0_INIT); 342 343 /* Wait for initialization to finish. */ 344 for (timo = 100000; timo; timo--) 345 if ((*sc->sc_rdcsr)(sc, LE_CSR0) & LE_C0_IDON) 346 break; 347 348 if ((*sc->sc_rdcsr)(sc, LE_CSR0) & LE_C0_IDON) { 349 /* Start the LANCE. */ 350 (*sc->sc_wrcsr)(sc, LE_CSR0, LE_C0_INEA | LE_C0_STRT | 351 LE_C0_IDON); 352 ifp->if_flags |= IFF_RUNNING; 353 ifp->if_flags &= ~IFF_OACTIVE; 354 ifp->if_timer = 0; 355 (*sc->sc_start)(ifp); 356 } else 357 printf("%s: controller failed to initialize\n", 358 sc->sc_dev.dv_xname); 359 if (sc->sc_hwinit) 360 (*sc->sc_hwinit)(sc); 361 362 return (0); 363 } 364 365 /* 366 * Routine to copy from mbuf chain to transmit buffer in 367 * network buffer memory. 368 */ 369 int 370 lance_put(sc, boff, m) 371 struct lance_softc *sc; 372 int boff; 373 struct mbuf *m; 374 { 375 struct mbuf *n; 376 int len, tlen = 0; 377 378 for (; m; m = n) { 379 len = m->m_len; 380 if (len == 0) { 381 MFREE(m, n); 382 continue; 383 } 384 (*sc->sc_copytobuf)(sc, mtod(m, caddr_t), boff, len); 385 boff += len; 386 tlen += len; 387 MFREE(m, n); 388 } 389 if (tlen < LEMINSIZE) { 390 (*sc->sc_zerobuf)(sc, boff, LEMINSIZE - tlen); 391 tlen = LEMINSIZE; 392 } 393 return (tlen); 394 } 395 396 /* 397 * Pull data off an interface. 398 * Len is length of data, with local net header stripped. 399 * We copy the data into mbufs. When full cluster sized units are present 400 * we copy into clusters. 401 */ 402 integrate struct mbuf * 403 lance_get(sc, boff, totlen) 404 struct lance_softc *sc; 405 int boff, totlen; 406 { 407 struct mbuf *m, *m0, *newm; 408 int len; 409 410 MGETHDR(m0, M_DONTWAIT, MT_DATA); 411 if (m0 == 0) 412 return (0); 413 m0->m_pkthdr.rcvif = &sc->sc_ethercom.ec_if; 414 m0->m_pkthdr.len = totlen; 415 len = MHLEN; 416 m = m0; 417 418 while (totlen > 0) { 419 if (totlen >= MINCLSIZE) { 420 MCLGET(m, M_DONTWAIT); 421 if ((m->m_flags & M_EXT) == 0) 422 goto bad; 423 len = MCLBYTES; 424 } 425 426 if (m == m0) { 427 caddr_t newdata = (caddr_t) 428 ALIGN(m->m_data + sizeof(struct ether_header)) - 429 sizeof(struct ether_header); 430 len -= newdata - m->m_data; 431 m->m_data = newdata; 432 } 433 434 m->m_len = len = min(totlen, len); 435 (*sc->sc_copyfrombuf)(sc, mtod(m, caddr_t), boff, len); 436 boff += len; 437 438 totlen -= len; 439 if (totlen > 0) { 440 MGET(newm, M_DONTWAIT, MT_DATA); 441 if (newm == 0) 442 goto bad; 443 len = MLEN; 444 m = m->m_next = newm; 445 } 446 } 447 448 return (m0); 449 450 bad: 451 m_freem(m0); 452 return (0); 453 } 454 455 /* 456 * Pass a packet to the higher levels. 457 */ 458 void 459 lance_read(sc, boff, len) 460 struct lance_softc *sc; 461 int boff, len; 462 { 463 struct mbuf *m; 464 struct ifnet *ifp = &sc->sc_ethercom.ec_if; 465 struct ether_header *eh; 466 467 if (len <= sizeof(struct ether_header) || 468 len > ((sc->sc_ethercom.ec_capenable & ETHERCAP_VLAN_MTU) ? 469 ETHER_VLAN_ENCAP_LEN + ETHERMTU + sizeof(struct ether_header) : 470 ETHERMTU + sizeof(struct ether_header))) { 471 #ifdef LEDEBUG 472 printf("%s: invalid packet size %d; dropping\n", 473 sc->sc_dev.dv_xname, len); 474 #endif 475 ifp->if_ierrors++; 476 return; 477 } 478 479 /* Pull packet off interface. */ 480 m = lance_get(sc, boff, len); 481 if (m == 0) { 482 ifp->if_ierrors++; 483 return; 484 } 485 486 ifp->if_ipackets++; 487 488 eh = mtod(m, struct ether_header *); 489 490 #ifdef LANCE_REVC_BUG 491 /* 492 * The old LANCE (Rev. C) chips have a bug which causes 493 * garbage to be inserted in front of the received packet. 494 * The work-around is to ignore packets with an invalid 495 * destination address (garbage will usually not match). 496 * Of course, this precludes multicast support... 497 */ 498 if (ETHER_CMP(eh->ether_dhost, sc->sc_enaddr) && 499 ETHER_CMP(eh->ether_dhost, bcast_enaddr)) { 500 m_freem(m); 501 return; 502 } 503 #endif 504 505 /* 506 * Some lance device does not present IFF_SIMPLEX behavior on multicast 507 * packets. Make sure to drop it if it is from ourselves. 508 */ 509 if (!ETHER_CMP(eh->ether_shost, sc->sc_enaddr)) { 510 m_freem(m); 511 return; 512 } 513 514 #if NBPFILTER > 0 515 /* 516 * Check if there's a BPF listener on this interface. 517 * If so, hand off the raw packet to BPF. 518 */ 519 if (ifp->if_bpf) 520 bpf_mtap(ifp->if_bpf, m); 521 #endif 522 523 /* Pass the packet up. */ 524 (*ifp->if_input)(ifp, m); 525 } 526 527 #undef ifp 528 529 void 530 lance_watchdog(ifp) 531 struct ifnet *ifp; 532 { 533 struct lance_softc *sc = ifp->if_softc; 534 535 log(LOG_ERR, "%s: device timeout\n", sc->sc_dev.dv_xname); 536 ++ifp->if_oerrors; 537 538 lance_reset(sc); 539 } 540 541 int 542 lance_mediachange(ifp) 543 struct ifnet *ifp; 544 { 545 struct lance_softc *sc = ifp->if_softc; 546 547 if (sc->sc_mediachange) 548 return ((*sc->sc_mediachange)(sc)); 549 return (0); 550 } 551 552 void 553 lance_mediastatus(ifp, ifmr) 554 struct ifnet *ifp; 555 struct ifmediareq *ifmr; 556 { 557 struct lance_softc *sc = ifp->if_softc; 558 559 if ((ifp->if_flags & IFF_UP) == 0) 560 return; 561 562 ifmr->ifm_status = IFM_AVALID; 563 if (sc->sc_havecarrier) 564 ifmr->ifm_status |= IFM_ACTIVE; 565 566 if (sc->sc_mediastatus) 567 (*sc->sc_mediastatus)(sc, ifmr); 568 } 569 570 /* 571 * Process an ioctl request. 572 */ 573 int 574 lance_ioctl(ifp, cmd, data) 575 struct ifnet *ifp; 576 u_long cmd; 577 caddr_t data; 578 { 579 struct lance_softc *sc = ifp->if_softc; 580 struct ifreq *ifr = (struct ifreq *)data; 581 int s, error = 0; 582 583 s = splnet(); 584 585 switch (cmd) { 586 587 case SIOCSIFADDR: 588 case SIOCSIFFLAGS: 589 error = ether_ioctl(ifp, cmd, data); 590 break; 591 592 #if defined(CCITT) && defined(LLC) 593 case SIOCSIFCONF_X25: 594 { 595 struct ifaddr *ifa = (struct ifaddr *) data; 596 597 ifp->if_flags |= IFF_UP; 598 ifa->ifa_rtrequest = cons_rtrequest; /* XXX */ 599 error = x25_llcglue(PRC_IFUP, ifa->ifa_addr); 600 if (error == 0) 601 lance_init(&sc->sc_ethercom.ec_if); 602 break; 603 } 604 #endif /* CCITT && LLC */ 605 606 case SIOCADDMULTI: 607 case SIOCDELMULTI: 608 error = (cmd == SIOCADDMULTI) ? 609 ether_addmulti(ifr, &sc->sc_ethercom) : 610 ether_delmulti(ifr, &sc->sc_ethercom); 611 612 if (error == ENETRESET) { 613 /* 614 * Multicast list has changed; set the hardware filter 615 * accordingly. 616 */ 617 lance_reset(sc); 618 error = 0; 619 } 620 break; 621 622 case SIOCGIFMEDIA: 623 case SIOCSIFMEDIA: 624 error = ifmedia_ioctl(ifp, ifr, &sc->sc_media, cmd); 625 break; 626 627 default: 628 error = EINVAL; 629 break; 630 } 631 632 splx(s); 633 return (error); 634 } 635 636 hide void 637 lance_shutdown(arg) 638 void *arg; 639 { 640 641 lance_stop((struct ifnet *)arg, 0); 642 } 643 644 /* 645 * Set up the logical address filter. 646 */ 647 void 648 lance_setladrf(ac, af) 649 struct ethercom *ac; 650 u_int16_t *af; 651 { 652 struct ifnet *ifp = &ac->ec_if; 653 struct ether_multi *enm; 654 u_int32_t crc; 655 struct ether_multistep step; 656 657 /* 658 * Set up multicast address filter by passing all multicast addresses 659 * through a crc generator, and then using the high order 6 bits as an 660 * index into the 64 bit logical address filter. The high order bit 661 * selects the word, while the rest of the bits select the bit within 662 * the word. 663 */ 664 665 if (ifp->if_flags & IFF_PROMISC) 666 goto allmulti; 667 668 af[0] = af[1] = af[2] = af[3] = 0x0000; 669 ETHER_FIRST_MULTI(step, ac, enm); 670 while (enm != NULL) { 671 if (ETHER_CMP(enm->enm_addrlo, enm->enm_addrhi)) { 672 /* 673 * We must listen to a range of multicast addresses. 674 * For now, just accept all multicasts, rather than 675 * trying to set only those filter bits needed to match 676 * the range. (At this time, the only use of address 677 * ranges is for IP multicast routing, for which the 678 * range is big enough to require all bits set.) 679 */ 680 goto allmulti; 681 } 682 683 crc = ether_crc32_le(enm->enm_addrlo, ETHER_ADDR_LEN); 684 685 /* Just want the 6 most significant bits. */ 686 crc >>= 26; 687 688 /* Set the corresponding bit in the filter. */ 689 af[crc >> 4] |= 1 << (crc & 0xf); 690 691 ETHER_NEXT_MULTI(step, enm); 692 } 693 ifp->if_flags &= ~IFF_ALLMULTI; 694 return; 695 696 allmulti: 697 ifp->if_flags |= IFF_ALLMULTI; 698 af[0] = af[1] = af[2] = af[3] = 0xffff; 699 } 700 701 /* 702 * Routines for accessing the transmit and receive buffers. 703 * The various CPU and adapter configurations supported by this 704 * driver require three different access methods for buffers 705 * and descriptors: 706 * (1) contig (contiguous data; no padding), 707 * (2) gap2 (two bytes of data followed by two bytes of padding), 708 * (3) gap16 (16 bytes of data followed by 16 bytes of padding). 709 */ 710 711 /* 712 * contig: contiguous data with no padding. 713 * 714 * Buffers may have any alignment. 715 */ 716 717 void 718 lance_copytobuf_contig(sc, from, boff, len) 719 struct lance_softc *sc; 720 void *from; 721 int boff, len; 722 { 723 volatile caddr_t buf = sc->sc_mem; 724 725 /* 726 * Just call memcpy() to do the work. 727 */ 728 memcpy(buf + boff, from, len); 729 } 730 731 void 732 lance_copyfrombuf_contig(sc, to, boff, len) 733 struct lance_softc *sc; 734 void *to; 735 int boff, len; 736 { 737 volatile caddr_t buf = sc->sc_mem; 738 739 /* 740 * Just call memcpy() to do the work. 741 */ 742 memcpy(to, buf + boff, len); 743 } 744 745 void 746 lance_zerobuf_contig(sc, boff, len) 747 struct lance_softc *sc; 748 int boff, len; 749 { 750 volatile caddr_t buf = sc->sc_mem; 751 752 /* 753 * Just let memset() do the work 754 */ 755 memset(buf + boff, 0, len); 756 } 757 758 #if 0 759 /* 760 * Examples only; duplicate these and tweak (if necessary) in 761 * machine-specific front-ends. 762 */ 763 764 /* 765 * gap2: two bytes of data followed by two bytes of pad. 766 * 767 * Buffers must be 4-byte aligned. The code doesn't worry about 768 * doing an extra byte. 769 */ 770 771 void 772 lance_copytobuf_gap2(sc, fromv, boff, len) 773 struct lance_softc *sc; 774 void *fromv; 775 int boff; 776 int len; 777 { 778 volatile caddr_t buf = sc->sc_mem; 779 caddr_t from = fromv; 780 volatile u_int16_t *bptr; 781 782 if (boff & 0x1) { 783 /* handle unaligned first byte */ 784 bptr = ((volatile u_int16_t *)buf) + (boff - 1); 785 *bptr = (*from++ << 8) | (*bptr & 0xff); 786 bptr += 2; 787 len--; 788 } else 789 bptr = ((volatile u_int16_t *)buf) + boff; 790 while (len > 1) { 791 *bptr = (from[1] << 8) | (from[0] & 0xff); 792 bptr += 2; 793 from += 2; 794 len -= 2; 795 } 796 if (len == 1) 797 *bptr = (u_int16_t)*from; 798 } 799 800 void 801 lance_copyfrombuf_gap2(sc, tov, boff, len) 802 struct lance_softc *sc; 803 void *tov; 804 int boff, len; 805 { 806 volatile caddr_t buf = sc->sc_mem; 807 caddr_t to = tov; 808 volatile u_int16_t *bptr; 809 u_int16_t tmp; 810 811 if (boff & 0x1) { 812 /* handle unaligned first byte */ 813 bptr = ((volatile u_int16_t *)buf) + (boff - 1); 814 *to++ = (*bptr >> 8) & 0xff; 815 bptr += 2; 816 len--; 817 } else 818 bptr = ((volatile u_int16_t *)buf) + boff; 819 while (len > 1) { 820 tmp = *bptr; 821 *to++ = tmp & 0xff; 822 *to++ = (tmp >> 8) & 0xff; 823 bptr += 2; 824 len -= 2; 825 } 826 if (len == 1) 827 *to = *bptr & 0xff; 828 } 829 830 void 831 lance_zerobuf_gap2(sc, boff, len) 832 struct lance_softc *sc; 833 int boff, len; 834 { 835 volatile caddr_t buf = sc->sc_mem; 836 volatile u_int16_t *bptr; 837 838 if ((unsigned)boff & 0x1) { 839 bptr = ((volatile u_int16_t *)buf) + (boff - 1); 840 *bptr &= 0xff; 841 bptr += 2; 842 len--; 843 } else 844 bptr = ((volatile u_int16_t *)buf) + boff; 845 while (len > 0) { 846 *bptr = 0; 847 bptr += 2; 848 len -= 2; 849 } 850 } 851 852 /* 853 * gap16: 16 bytes of data followed by 16 bytes of pad. 854 * 855 * Buffers must be 32-byte aligned. 856 */ 857 858 void 859 lance_copytobuf_gap16(sc, fromv, boff, len) 860 struct lance_softc *sc; 861 void *fromv; 862 int boff; 863 int len; 864 { 865 volatile caddr_t buf = sc->sc_mem; 866 caddr_t from = fromv; 867 caddr_t bptr; 868 int xfer; 869 870 bptr = buf + ((boff << 1) & ~0x1f); 871 boff &= 0xf; 872 xfer = min(len, 16 - boff); 873 while (len > 0) { 874 memcpy(bptr + boff, from, xfer); 875 from += xfer; 876 bptr += 32; 877 boff = 0; 878 len -= xfer; 879 xfer = min(len, 16); 880 } 881 } 882 883 void 884 lance_copyfrombuf_gap16(sc, tov, boff, len) 885 struct lance_softc *sc; 886 void *tov; 887 int boff, len; 888 { 889 volatile caddr_t buf = sc->sc_mem; 890 caddr_t to = tov; 891 caddr_t bptr; 892 int xfer; 893 894 bptr = buf + ((boff << 1) & ~0x1f); 895 boff &= 0xf; 896 xfer = min(len, 16 - boff); 897 while (len > 0) { 898 memcpy(to, bptr + boff, xfer); 899 to += xfer; 900 bptr += 32; 901 boff = 0; 902 len -= xfer; 903 xfer = min(len, 16); 904 } 905 } 906 907 void 908 lance_zerobuf_gap16(sc, boff, len) 909 struct lance_softc *sc; 910 int boff, len; 911 { 912 volatile caddr_t buf = sc->sc_mem; 913 caddr_t bptr; 914 int xfer; 915 916 bptr = buf + ((boff << 1) & ~0x1f); 917 boff &= 0xf; 918 xfer = min(len, 16 - boff); 919 while (len > 0) { 920 memset(bptr + boff, 0, xfer); 921 bptr += 32; 922 boff = 0; 923 len -= xfer; 924 xfer = min(len, 16); 925 } 926 } 927 #endif /* Example only */ 928
Indexes created Thu Oct 16 14:10:15 GMT 2025