sys/dev/netif/lnc/if_lnc.c

   1 /*-
   2  * Copyright (c) 1994-2000
   3  *      Paul Richards.  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  *    verbatim and that no modifications are made prior to this
  11  *    point in the file.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  * 3. The name Paul Richards may not be used to endorse or promote products
  16  *    derived from this software without specific prior written permission.
  17  *
  18  * THIS SOFTWARE IS PROVIDED BY PAUL RICHARDS ``AS IS'' AND
  19  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  20  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  21  * ARE DISCLAIMED.  IN NO EVENT SHALL PAUL RICHARDS BE LIABLE
  22  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  23  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  24  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  25  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  26  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  27  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  28  * SUCH DAMAGE.
  29  *
  30  * $FreeBSD: src/sys/dev/lnc/if_lnc.c,v 1.89 2001/07/04 13:00:19 nyan Exp $
  31  * $DragonFly: src/sys/dev/netif/lnc/Attic/if_lnc.c,v 1.13 2004/07/29 08:46:22 dillon Exp $
  32  */
  33
  34 /*
  35 #define DIAGNOSTIC
  36 #define DEBUG
  37  *
  38  * TODO ----
  39  *
  40  * Check all the XXX comments -- some of them are just things I've left
  41  * unfinished rather than "difficult" problems that were hacked around.
  42  *
  43  * Check log settings.
  44  *
  45  * Check how all the arpcom flags get set and used.
  46  *
  47  * Re-inline and re-static all routines after debugging.
  48  *
  49  * Remember to assign iobase in SHMEM probe routines.
  50  *
  51  * Replace all occurences of LANCE-controller-card etc in prints by the name
  52  * strings of the appropriate type -- nifty window dressing
  53  *
  54  * Add DEPCA support -- mostly done.
  55  *
  56  */
  57
  58 #include "opt_inet.h"
  59
  60 /* Some defines that should really be in generic locations */
  61 #define FCS_LEN 4
  62 #define MULTICAST_FILTER_LEN 8
  63
  64 #include <sys/param.h>
  65 #include <sys/systm.h>
  66 #include <sys/bus.h>
  67 #include <sys/kernel.h>
  68 #include <sys/malloc.h>
  69 #include <sys/mbuf.h>
  70 #include <sys/module.h>
  71 #include <sys/socket.h>
  72 #include <sys/sockio.h>
  73 #include <sys/syslog.h>
  74
  75 #include <machine/bus.h>
  76 #include <machine/resource.h>
  77 #include <sys/rman.h>
  78
  79 #include <net/ethernet.h>
  80 #include <net/if.h>
  81 #include <net/if_dl.h>
  82 #include <net/if_types.h>
  83
  84 #include <netinet/in.h>
  85 #include <netinet/if_ether.h>
  86
  87 #include <net/bpf.h>
  88
  89 #include <machine/md_var.h>
  90
  91 #include <dev/netif/lnc/if_lncvar.h>
  92 #include <dev/netif/lnc/if_lncreg.h>
  93
  94 DECLARE_DUMMY_MODULE(if_lnc);
  95
  96 devclass_t lnc_devclass;
  97
  98 static char const * const nic_ident[] = {
  99         "Unknown",
 100         "BICC",
 101         "NE2100",
 102         "DEPCA",
 103         "CNET98S",      /* PC-98 */
 104 };
 105
 106 static char const * const ic_ident[] = {
 107         "Unknown",
 108         "LANCE",
 109         "C-LANCE",
 110         "PCnet-ISA",
 111         "PCnet-ISA+",
 112         "PCnet-ISA II",
 113         "PCnet-32 VL-Bus",
 114         "PCnet-PCI",
 115         "PCnet-PCI II",
 116         "PCnet-FAST",
 117         "PCnet-FAST+",
 118         "PCnet-Home",
 119 };
 120
 121 static void lnc_setladrf(struct lnc_softc *sc);
 122 static void lnc_reset(struct lnc_softc *sc);
 123 static void lnc_free_mbufs(struct lnc_softc *sc);
 124 static __inline int alloc_mbuf_cluster(struct lnc_softc *sc,
 125                                             struct host_ring_entry *desc);
 126 static __inline struct mbuf *chain_mbufs(struct lnc_softc *sc,
 127                                               int start_of_packet,
 128                                               int pkt_len);
 129 static __inline struct mbuf *mbuf_packet(struct lnc_softc *sc,
 130                                               int start_of_packet,
 131                                               int pkt_len);
 132 static __inline void lnc_rint(struct lnc_softc *sc);
 133 static __inline void lnc_tint(struct lnc_softc *sc);
 134
 135 static void lnc_init(void *);
 136 static __inline int mbuf_to_buffer(struct mbuf *m, char *buffer);
 137 static __inline struct mbuf *chain_to_cluster(struct mbuf *m);
 138 static void lnc_start(struct ifnet *ifp);
 139 static int lnc_ioctl(struct ifnet *ifp, u_long command, caddr_t data,
 140                      struct ucred *);
 141 static void lnc_watchdog(struct ifnet *ifp);
 142 #ifdef DEBUG
 143 void lnc_dump_state(struct lnc_softc *sc);
 144 void mbuf_dump_chain(struct mbuf *m);
 145 #endif
 146
 147 u_short
 148 read_csr(struct lnc_softc *sc, u_short port)
 149 {
 150         lnc_outw(sc->rap, port);
 151         return (lnc_inw(sc->rdp));
 152 }
 153
 154 void
 155 write_csr(struct lnc_softc *sc, u_short port, u_short val)
 156 {
 157         lnc_outw(sc->rap, port);
 158         lnc_outw(sc->rdp, val);
 159 }
 160
 161 static __inline void
 162 write_bcr(struct lnc_softc *sc, u_short port, u_short val)
 163 {
 164         lnc_outw(sc->rap, port);
 165         lnc_outw(sc->bdp, val);
 166 }
 167
 168 static __inline u_short
 169 read_bcr(struct lnc_softc *sc, u_short port)
 170 {
 171         lnc_outw(sc->rap, port);
 172         return (lnc_inw(sc->bdp));
 173 }
 174
 175 int
 176 lance_probe(struct lnc_softc *sc)
 177 {
 178         write_csr(sc, CSR0, STOP);
 179
 180         if ((lnc_inw(sc->rdp) & STOP) && ! (read_csr(sc, CSR3))) {
 181                 /*
 182                  * Check to see if it's a C-LANCE. For the LANCE the INEA bit
 183                  * cannot be set while the STOP bit is. This restriction is
 184                  * removed for the C-LANCE.
 185                  */
 186                 write_csr(sc, CSR0, INEA);
 187                 if (read_csr(sc, CSR0) & INEA)
 188                         return (C_LANCE);
 189                 else
 190                         return (LANCE);
 191         } else
 192                 return (UNKNOWN);
 193 }
 194
 195 static __inline u_long
 196 ether_crc(const u_char *ether_addr)
 197 {
 198 #define POLYNOMIAL           0xEDB88320UL
 199     u_char i, j, addr;
 200     u_int crc = 0xFFFFFFFFUL;
 201
 202     for (i = 0; i < ETHER_ADDR_LEN; i++) {
 203         addr = *ether_addr++;
 204         for (j = 0; j < MULTICAST_FILTER_LEN; j++) {
 205             crc = (crc >> 1) ^ (((crc ^ addr) & 1) ? POLYNOMIAL : 0);
 206             addr >>= 1;
 207         }
 208     }
 209     return crc;
 210 #undef POLYNOMIAL
 211 }
 212
 213 void
 214 lnc_release_resources(device_t dev)
 215 {
 216         lnc_softc_t *sc = device_get_softc(dev);
 217
 218         if (sc->irqres) {
 219                 bus_teardown_intr(dev, sc->irqres, sc->intrhand);
 220                 bus_release_resource(dev, SYS_RES_IRQ, sc->irqrid, sc->irqres);
 221         }
 222
 223         if (sc->portres)
 224                 bus_release_resource(dev, SYS_RES_IOPORT,
 225                                      sc->portrid, sc->portres);
 226         if (sc->drqres)
 227                 bus_release_resource(dev, SYS_RES_DRQ, sc->drqrid, sc->drqres);
 228
 229         if (sc->dmat) {
 230                 if (sc->dmamap) {
 231                         bus_dmamap_unload(sc->dmat, sc->dmamap);
 232                         bus_dmamem_free(sc->dmat, sc->recv_ring, sc->dmamap);
 233                 }
 234                 bus_dma_tag_destroy(sc->dmat);
 235         }
 236 }
 237
 238 /*
 239  * Set up the logical address filter for multicast packets
 240  */
 241 static __inline void
 242 lnc_setladrf(struct lnc_softc *sc)
 243 {
 244         struct ifnet *ifp = &sc->arpcom.ac_if;
 245         struct ifmultiaddr *ifma;
 246         u_long index;
 247         int i;
 248
 249         if (sc->flags & IFF_ALLMULTI) {
 250             for (i=0; i < MULTICAST_FILTER_LEN; i++)
 251                 sc->init_block->ladrf[i] = 0xFF;
 252             return;
 253         }
 254
 255         /*
 256          * For each multicast address, calculate a crc for that address and
 257          * then use the high order 6 bits of the crc as a hash code where
 258          * bits 3-5 select the byte of the address filter and bits 0-2 select
 259          * the bit within that byte.
 260          */
 261
 262         bzero(sc->init_block->ladrf, MULTICAST_FILTER_LEN);
 263         LIST_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) {
 264                 if (ifma->ifma_addr->sa_family != AF_LINK)
 265                         continue;
 266
 267                 index = ether_crc(LLADDR((struct sockaddr_dl *)ifma->ifma_addr))
 268                                 >> 26;
 269                 sc->init_block->ladrf[index >> 3] |= 1 << (index & 7);
 270         }
 271 }
 272
 273 void
 274 lnc_stop(struct lnc_softc *sc)
 275 {
 276         write_csr(sc, CSR0, STOP);
 277 }
 278
 279 static void
 280 lnc_reset(struct lnc_softc *sc)
 281 {
 282         lnc_init(sc);
 283 }
 284
 285 static void
 286 lnc_free_mbufs(struct lnc_softc *sc)
 287 {
 288         int i;
 289
 290         /*
 291          * We rely on other routines to keep the buff.mbuf field valid. If
 292          * it's not NULL then we assume it points to an allocated mbuf.
 293          */
 294
 295         for (i = 0; i < NDESC(sc->nrdre); i++)
 296                 if ((sc->recv_ring + i)->buff.mbuf)
 297                         m_free((sc->recv_ring + i)->buff.mbuf);
 298
 299         for (i = 0; i < NDESC(sc->ntdre); i++)
 300                 if ((sc->trans_ring + i)->buff.mbuf)
 301                         m_free((sc->trans_ring + i)->buff.mbuf);
 302
 303         if (sc->mbuf_count)
 304                 m_freem(sc->mbufs);
 305 }
 306
 307 static __inline int
 308 alloc_mbuf_cluster(struct lnc_softc *sc, struct host_ring_entry *desc)
 309 {
 310         register struct mds *md = desc->md;
 311         struct mbuf *m=0;
 312         int addr;
 313
 314         /* Try and get cluster off local cache */
 315         if (sc->mbuf_count) {
 316                 sc->mbuf_count--;
 317                 m = sc->mbufs;
 318                 sc->mbufs = m->m_next;
 319                 /* XXX m->m_data = m->m_ext.ext_buf;*/
 320         } else {
 321                 MGET(m, MB_DONTWAIT, MT_DATA);
 322         if (!m)
 323                         return(1);
 324       MCLGET(m, MB_DONTWAIT);
 325         if (!m->m_ext.ext_buf) {
 326                         m_free(m);
 327                         return(1);
 328                 }
 329         }
 330
 331         desc->buff.mbuf = m;
 332         addr = kvtop(m->m_data);
 333         md->md0 = addr;
 334         md->md1= ((addr >> 16) & 0xff) | OWN;
 335         md->md2 = -(short)(MCLBYTES - sizeof(struct pkthdr));
 336         md->md3 = 0;
 337         return(0);
 338 }
 339
 340 static __inline struct mbuf *
 341 chain_mbufs(struct lnc_softc *sc, int start_of_packet, int pkt_len)
 342 {
 343         struct mbuf *head, *m;
 344         struct host_ring_entry *desc;
 345
 346         /*
 347          * Turn head into a pkthdr mbuf --
 348          * assumes a pkthdr type mbuf was
 349          * allocated to the descriptor
 350          * originally.
 351          */
 352
 353         desc = sc->recv_ring + start_of_packet;
 354
 355         head = desc->buff.mbuf;
 356         head->m_flags |= M_PKTHDR;
 357         bzero(&head->m_pkthdr, sizeof(head->m_pkthdr));
 358
 359         m = head;
 360         do {
 361                 m = desc->buff.mbuf;
 362                 m->m_len = min((MCLBYTES - sizeof(struct pkthdr)), pkt_len);
 363                 pkt_len -= m->m_len;
 364                 if (alloc_mbuf_cluster(sc, desc))
 365                         return((struct mbuf *)NULL);
 366                 INC_MD_PTR(start_of_packet, sc->nrdre)
 367                 desc = sc->recv_ring + start_of_packet;
 368                 m->m_next = desc->buff.mbuf;
 369         } while (start_of_packet != sc->recv_next);
 370
 371         m->m_next = 0;
 372         return(head);
 373 }
 374
 375 static __inline struct mbuf *
 376 mbuf_packet(struct lnc_softc *sc, int start_of_packet, int pkt_len)
 377 {
 378
 379         struct host_ring_entry *start;
 380         struct mbuf *head,*m,*m_prev;
 381         char *data,*mbuf_data;
 382         short blen;
 383         int amount;
 384
 385         /* Get a pkthdr mbuf for the start of packet */
 386         MGETHDR(head, MB_DONTWAIT, MT_DATA);
 387         if (!head) {
 388                 LNCSTATS(drop_packet)
 389                 return(0);
 390         }
 391
 392         m = head;
 393         m->m_len = 0;
 394         start = sc->recv_ring + start_of_packet;
 395         /*blen = -(start->md->md2);*/
 396         blen = RECVBUFSIZE; /* XXX More PCnet-32 crap */
 397         data = start->buff.data;
 398         mbuf_data = m->m_data;
 399
 400         while (start_of_packet != sc->recv_next) {
 401                 /*
 402                  * If the data left fits in a single buffer then set
 403                  * blen to the size of the data left.
 404                  */
 405                 if (pkt_len < blen)
 406                         blen = pkt_len;
 407
 408                 /*
 409                  * amount is least of data in current ring buffer and
 410                  * amount of space left in current mbuf.
 411                  */
 412                 amount = min(blen, M_TRAILINGSPACE(m));
 413                 if (amount == 0) {
 414                         /* mbuf must be empty */
 415                         m_prev = m;
 416                         MGET(m, MB_DONTWAIT, MT_DATA);
 417                         if (!m) {
 418                                 m_freem(head);
 419                                 return(0);
 420                         }
 421                         if (pkt_len >= MINCLSIZE)
 422                                 MCLGET(m, MB_DONTWAIT);
 423                         m->m_len = 0;
 424                         m_prev->m_next = m;
 425                         amount = min(blen, M_TRAILINGSPACE(m));
 426                         mbuf_data = m->m_data;
 427                 }
 428                 bcopy(data, mbuf_data, amount);
 429                 blen -= amount;
 430                 pkt_len -= amount;
 431                 m->m_len += amount;
 432                 data += amount;
 433                 mbuf_data += amount;
 434
 435                 if (blen == 0) {
 436                         start->md->md1 &= HADR;
 437                         start->md->md1 |= OWN;
 438                         start->md->md2 = -RECVBUFSIZE; /* XXX - shouldn't be necessary */
 439                         INC_MD_PTR(start_of_packet, sc->nrdre)
 440                         start = sc->recv_ring + start_of_packet;
 441                         data = start->buff.data;
 442                         /*blen = -(start->md->md2);*/
 443                         blen = RECVBUFSIZE; /* XXX More PCnet-32 crap */
 444                 }
 445         }
 446         return(head);
 447 }
 448
 449
 450 static __inline void
 451 lnc_rint(struct lnc_softc *sc)
 452 {
 453         struct ifnet *ifp = &sc->arpcom.ac_if;
 454         struct host_ring_entry *next, *start;
 455         int start_of_packet;
 456         struct mbuf *head;
 457         struct ether_header *eh;
 458         int lookahead;
 459         int flags;
 460         int pkt_len;
 461
 462         /*
 463          * The LANCE will issue a RINT interrupt when the ownership of the
 464          * last buffer of a receive packet has been relinquished by the LANCE.
 465          * Therefore, it can be assumed that a complete packet can be found
 466          * before hitting buffers that are still owned by the LANCE, if not
 467          * then there is a bug in the driver that is causing the descriptors
 468          * to get out of sync.
 469          */
 470
 471 #ifdef DIAGNOSTIC
 472         if ((sc->recv_ring + sc->recv_next)->md->md1 & OWN) {
 473                 int unit = ifp->if_dunit;
 474                 log(LOG_ERR, "lnc%d: Receive interrupt with buffer still owned by controller -- Resetting\n", unit);
 475                 lnc_reset(sc);
 476                 return;
 477         }
 478         if (!((sc->recv_ring + sc->recv_next)->md->md1 & STP)) {
 479                 int unit = ifp->if_dunit;
 480                 log(LOG_ERR, "lnc%d: Receive interrupt but not start of packet -- Resetting\n", unit);
 481                 lnc_reset(sc);
 482                 return;
 483         }
 484 #endif
 485
 486         lookahead = 0;
 487         next = sc->recv_ring + sc->recv_next;
 488         while ((flags = next->md->md1) & STP) {
 489
 490                 /* Make a note of the start of the packet */
 491                 start_of_packet = sc->recv_next;
 492
 493                 /*
 494                  * Find the end of the packet. Even if not data chaining,
 495                  * jabber packets can overrun into a second descriptor.
 496                  * If there is no error, then the ENP flag is set in the last
 497                  * descriptor of the packet. If there is an error then the ERR
 498                  * flag will be set in the descriptor where the error occured.
 499                  * Therefore, to find the last buffer of a packet we search for
 500                  * either ERR or ENP.
 501                  */
 502
 503                 if (!(flags & (ENP | MDERR))) {
 504                         do {
 505                                 INC_MD_PTR(sc->recv_next, sc->nrdre)
 506                                 next = sc->recv_ring + sc->recv_next;
 507                                 flags = next->md->md1;
 508                         } while (!(flags & (STP | OWN | ENP | MDERR)));
 509
 510                         if (flags & STP) {
 511                                 int unit = ifp->if_dunit;
 512                                 log(LOG_ERR, "lnc%d: Start of packet found before end of previous in receive ring -- Resetting\n", unit);
 513                                 lnc_reset(sc);
 514                                 return;
 515                         }
 516                         if (flags & OWN) {
 517                                 if (lookahead) {
 518                                         /*
 519                                          * Looked ahead into a packet still
 520                                          * being received
 521                                          */
 522                                         sc->recv_next = start_of_packet;
 523                                         break;
 524                                 } else {
 525                                         int unit = ifp->if_dunit;
 526                                         log(LOG_ERR, "lnc%d: End of received packet not found-- Resetting\n", unit);
 527                                         lnc_reset(sc);
 528                                         return;
 529                                 }
 530                         }
 531                 }
 532
 533                 pkt_len = (next->md->md3 & MCNT) - FCS_LEN;
 534
 535                 /* Move pointer onto start of next packet */
 536                 INC_MD_PTR(sc->recv_next, sc->nrdre)
 537                 next = sc->recv_ring + sc->recv_next;
 538
 539                 if (flags & MDERR) {
 540                         int unit = ifp->if_dunit;
 541                         if (flags & RBUFF) {
 542                                 LNCSTATS(rbuff)
 543                                 log(LOG_ERR, "lnc%d: Receive buffer error\n", unit);
 544                         }
 545                         if (flags & OFLO) {
 546                                 /* OFLO only valid if ENP is not set */
 547                                 if (!(flags & ENP)) {
 548                                         LNCSTATS(oflo)
 549                                         log(LOG_ERR, "lnc%d: Receive overflow error \n", unit);
 550                                 }
 551                         } else if (flags & ENP) {
 552                             if ((ifp->if_flags & IFF_PROMISC)==0) {
 553                                 /*
 554                                  * FRAM and CRC are valid only if ENP
 555                                  * is set and OFLO is not.
 556                                  */
 557                                 if (flags & FRAM) {
 558                                         LNCSTATS(fram)
 559                                         log(LOG_ERR, "lnc%d: Framing error\n", unit);
 560                                         /*
 561                                          * FRAM is only set if there's a CRC
 562                                          * error so avoid multiple messages
 563                                          */
 564                                 } else if (flags & CRC) {
 565                                         LNCSTATS(crc)
 566                                         log(LOG_ERR, "lnc%d: Receive CRC error\n", unit);
 567                                 }
 568                             }
 569                         }
 570
 571                         /* Drop packet */
 572                         LNCSTATS(rerr)
 573                         ifp->if_ierrors++;
 574                         while (start_of_packet != sc->recv_next) {
 575                                 start = sc->recv_ring + start_of_packet;
 576                                 start->md->md2 = -RECVBUFSIZE; /* XXX - shouldn't be necessary */
 577                                 start->md->md1 &= HADR;
 578                                 start->md->md1 |= OWN;
 579                                 INC_MD_PTR(start_of_packet, sc->nrdre)
 580                         }
 581                 } else { /* Valid packet */
 582
 583                         ifp->if_ipackets++;
 584
 585
 586                         if (sc->nic.mem_mode == DMA_MBUF)
 587                                 head = chain_mbufs(sc, start_of_packet, pkt_len);
 588                         else
 589                                 head = mbuf_packet(sc, start_of_packet, pkt_len);
 590
 591                         if (head) {
 592                                 /*
 593                                  * First mbuf in packet holds the
 594                                  * ethernet and packet headers
 595                                  */
 596                                 head->m_pkthdr.rcvif = ifp;
 597                                 head->m_pkthdr.len = pkt_len ;
 598                                 eh = mtod(head, struct ether_header *);
 599
 600                                 /*
 601                                  * vmware ethernet hardware emulation loops
 602                                  * packets back to itself, violates IFF_SIMPLEX.
 603                                  * drop it if it is from myself.
 604                                 */
 605                                 if (bcmp(eh->ether_shost,
 606                                       sc->arpcom.ac_enaddr, ETHER_ADDR_LEN) == 0) {
 607                                     m_freem(head);
 608                                 } else {
 609                                         (ifp->if_input)(ifp, head);
 610                                 }
 611                         } else {
 612                                 int unit = ifp->if_dunit;
 613                                 log(LOG_ERR,"lnc%d: Packet dropped, no mbufs\n",unit);
 614                                 LNCSTATS(drop_packet)
 615                         }
 616                 }
 617
 618                 lookahead++;
 619         }
 620
 621         /*
 622          * At this point all completely received packets have been processed
 623          * so clear RINT since any packets that have arrived while we were in
 624          * here have been dealt with.
 625          */
 626
 627         lnc_outw(sc->rdp, RINT | INEA);
 628 }
 629
 630 static __inline void
 631 lnc_tint(struct lnc_softc *sc)
 632 {
 633         struct host_ring_entry *next, *start;
 634         int start_of_packet;
 635         int lookahead;
 636
 637         /*
 638          * If the driver is reset in this routine then we return immediately to
 639          * the interrupt driver routine. Any interrupts that have occured
 640          * since the reset will be dealt with there. sc->trans_next
 641          * should point to the start of the first packet that was awaiting
 642          * transmission after the last transmit interrupt was dealt with. The
 643          * LANCE should have relinquished ownership of that descriptor before
 644          * the interrupt. Therefore, sc->trans_next should point to a
 645          * descriptor with STP set and OWN cleared. If not then the driver's
 646          * pointers are out of sync with the LANCE, which signifies a bug in
 647          * the driver. Therefore, the following two checks are really
 648          * diagnostic, since if the driver is working correctly they should
 649          * never happen.
 650          */
 651
 652 #ifdef DIAGNOSTIC
 653         if ((sc->trans_ring + sc->trans_next)->md->md1 & OWN) {
 654                 int unit = sc->arpcom.ac_if.if_dunit;
 655                 log(LOG_ERR, "lnc%d: Transmit interrupt with buffer still owned by controller -- Resetting\n", unit);
 656                 lnc_reset(sc);
 657                 return;
 658         }
 659 #endif
 660
 661
 662         /*
 663          * The LANCE will write the status information for the packet it just
 664          * tried to transmit in one of two places. If the packet was
 665          * transmitted successfully then the status will be written into the
 666          * last descriptor of the packet. If the transmit failed then the
 667          * status will be written into the descriptor that was being accessed
 668          * when the error occured and all subsequent descriptors in that
 669          * packet will have been relinquished by the LANCE.
 670          *
 671          * At this point we know that sc->trans_next points to the start
 672          * of a packet that the LANCE has just finished trying to transmit.
 673          * We now search for a buffer with either ENP or ERR set.
 674          */
 675
 676         lookahead = 0;
 677
 678         do {
 679                 start_of_packet = sc->trans_next;
 680                 next = sc->trans_ring + sc->trans_next;
 681
 682 #ifdef DIAGNOSTIC
 683         if (!(next->md->md1 & STP)) {
 684                 int unit = sc->arpcom.ac_if.if_dunit;
 685                 log(LOG_ERR, "lnc%d: Transmit interrupt but not start of packet -- Resetting\n", unit);
 686                 lnc_reset(sc);
 687                 return;
 688         }
 689 #endif
 690
 691                 /*
 692                  * Find end of packet.
 693                  */
 694
 695                 if (!(next->md->md1 & (ENP | MDERR))) {
 696                         do {
 697                                 INC_MD_PTR(sc->trans_next, sc->ntdre)
 698                                 next = sc->trans_ring + sc->trans_next;
 699                         } while (!(next->md->md1 & (STP | OWN | ENP | MDERR)));
 700
 701                         if (next->md->md1 & STP) {
 702                                 int unit = sc->arpcom.ac_if.if_dunit;
 703                                 log(LOG_ERR, "lnc%d: Start of packet found before end of previous in transmit ring -- Resetting\n", unit);
 704                                 lnc_reset(sc);
 705                                 return;
 706                         }
 707                         if (next->md->md1 & OWN) {
 708                                 if (lookahead) {
 709                                         /*
 710                                          * Looked ahead into a packet still
 711                                          * being transmitted
 712                                          */
 713                                         sc->trans_next = start_of_packet;
 714                                         break;
 715                                 } else {
 716                                         int unit = sc->arpcom.ac_if.if_dunit;
 717                                         log(LOG_ERR, "lnc%d: End of transmitted packet not found -- Resetting\n", unit);
 718                                         lnc_reset(sc);
 719                                         return;
 720                                 }
 721                         }
 722                 }
 723                 /*
 724                  * Check for ERR first since other flags are irrelevant if an
 725                  * error occurred.
 726                  */
 727                 if (next->md->md1 & MDERR) {
 728
 729                         int unit = sc->arpcom.ac_if.if_dunit;
 730
 731                         LNCSTATS(terr)
 732                                 sc->arpcom.ac_if.if_oerrors++;
 733
 734                         if (next->md->md3 & LCOL) {
 735                                 LNCSTATS(lcol)
 736                                 log(LOG_ERR, "lnc%d: Transmit late collision  -- Net error?\n", unit);
 737                                 sc->arpcom.ac_if.if_collisions++;
 738                                 /*
 739                                  * Clear TBUFF since it's not valid when LCOL
 740                                  * set
 741                                  */
 742                                 next->md->md3 &= ~TBUFF;
 743                         }
 744                         if (next->md->md3 & LCAR) {
 745                                 LNCSTATS(lcar)
 746                                 log(LOG_ERR, "lnc%d: Loss of carrier during transmit -- Net error?\n", unit);
 747                         }
 748                         if (next->md->md3 & RTRY) {
 749                                 LNCSTATS(rtry)
 750                                 log(LOG_ERR, "lnc%d: Transmit of packet failed after 16 attempts -- TDR = %d\n", unit, ((sc->trans_ring + sc->trans_next)->md->md3 & TDR));
 751                                 sc->arpcom.ac_if.if_collisions += 16;
 752                                 /*
 753                                  * Clear TBUFF since it's not valid when RTRY
 754                                  * set
 755                                  */
 756                                 next->md->md3 &= ~TBUFF;
 757                         }
 758                         /*
 759                          * TBUFF is only valid if neither LCOL nor RTRY are set.
 760                          * We need to check UFLO after LCOL and RTRY so that we
 761                          * know whether or not TBUFF is valid. If either are
 762                          * set then TBUFF will have been cleared above. A
 763                          * UFLO error will turn off the transmitter so we
 764                          * have to reset.
 765                          *
 766                          */
 767
 768                         if (next->md->md3 & UFLO) {
 769                                 LNCSTATS(uflo)
 770                                 /*
 771                                  * If an UFLO has occured it's possibly due
 772                                  * to a TBUFF error
 773                                  */
 774                                 if (next->md->md3 & TBUFF) {
 775                                         LNCSTATS(tbuff)
 776                                         log(LOG_ERR, "lnc%d: Transmit buffer error -- Resetting\n", unit);
 777                                 } else
 778                                         log(LOG_ERR, "lnc%d: Transmit underflow error -- Resetting\n", unit);
 779                                 lnc_reset(sc);
 780                                 return;
 781                         }
 782                         do {
 783                                 INC_MD_PTR(sc->trans_next, sc->ntdre)
 784                                 next = sc->trans_ring + sc->trans_next;
 785                         } while (!(next->md->md1 & STP) && (sc->trans_next != sc->next_to_send));
 786
 787                 } else {
 788                         /*
 789                          * Since we check for ERR first then if we get here
 790                          * the packet was transmitted correctly. There may
 791                          * still have been non-fatal errors though.
 792                          * Don't bother checking for DEF, waste of time.
 793                          */
 794
 795                         sc->arpcom.ac_if.if_opackets++;
 796
 797                         if (next->md->md1 & MORE) {
 798                                 LNCSTATS(more)
 799                                 sc->arpcom.ac_if.if_collisions += 2;
 800                         }
 801
 802                         /*
 803                          * ONE is invalid if LCOL is set. If LCOL was set then
 804                          * ERR would have also been set and we would have
 805                          * returned from lnc_tint above. Therefore we can
 806                          * assume if we arrive here that ONE is valid.
 807                          *
 808                          */
 809
 810                         if (next->md->md1 & ONE) {
 811                                 LNCSTATS(one)
 812                                 sc->arpcom.ac_if.if_collisions++;
 813                         }
 814                         INC_MD_PTR(sc->trans_next, sc->ntdre)
 815                         next = sc->trans_ring + sc->trans_next;
 816                 }
 817
 818                 /*
 819                  * Clear descriptors and free any mbufs.
 820                  */
 821
 822                 do {
 823                         start = sc->trans_ring + start_of_packet;
 824                         start->md->md1 &= HADR;
 825                         if (sc->nic.mem_mode == DMA_MBUF) {
 826                                 /* Cache clusters on a local queue */
 827                                 if ((start->buff.mbuf->m_flags & M_EXT) && (sc->mbuf_count < MBUF_CACHE_LIMIT)) {
 828                                         if (sc->mbuf_count) {
 829                                                 start->buff.mbuf->m_next = sc->mbufs;
 830                                                 sc->mbufs = start->buff.mbuf;
 831                                         } else
 832                                                 sc->mbufs = start->buff.mbuf;
 833                                         sc->mbuf_count++;
 834                                         start->buff.mbuf = 0;
 835                                 } else {
 836                                         m_free(start->buff.mbuf);
 837                                         start->buff.mbuf = NULL;
 838                                 }
 839                         }
 840                         sc->pending_transmits--;
 841                         INC_MD_PTR(start_of_packet, sc->ntdre)
 842                 }while (start_of_packet != sc->trans_next);
 843
 844                 /*
 845                  * There's now at least one free descriptor
 846                  * in the ring so indicate that we can accept
 847                  * more packets again.
 848                  */
 849
 850                 sc->arpcom.ac_if.if_flags &= ~IFF_OACTIVE;
 851
 852                 lookahead++;
 853
 854         } while (sc->pending_transmits && !(next->md->md1 & OWN));
 855
 856         /*
 857          * Clear TINT since we've dealt with all
 858          * the completed transmissions.
 859          */
 860
 861         lnc_outw(sc->rdp, TINT | INEA);
 862 }
 863
 864 int
 865 lnc_attach_common(device_t dev)
 866 {
 867         lnc_softc_t *sc = device_get_softc(dev);
 868         struct ifnet *ifp = &sc->arpcom.ac_if;
 869         int i;
 870         int skip;
 871
 872         switch (sc->nic.ident) {
 873         case BICC:
 874         case CNET98S:
 875                 skip = 2;
 876                 break;
 877         default:
 878                 skip = 1;
 879                 break;
 880         }
 881
 882         /* Set default mode */
 883         sc->nic.mode = NORMAL;
 884
 885         /* Fill in arpcom structure entries */
 886
 887         ifp->if_softc = sc;
 888         if_initname(ifp, device_get_name(dev), device_get_unit(dev));
 889         ifp->if_flags = IFF_BROADCAST | IFF_SIMPLEX | IFF_MULTICAST;
 890         ifp->if_timer = 0;
 891         ifp->if_start = lnc_start;
 892         ifp->if_ioctl = lnc_ioctl;
 893         ifp->if_watchdog = lnc_watchdog;
 894         ifp->if_init = lnc_init;
 895         ifp->if_snd.ifq_maxlen = IFQ_MAXLEN;
 896
 897         /* Extract MAC address from PROM */
 898         for (i = 0; i < ETHER_ADDR_LEN; i++)
 899                 sc->arpcom.ac_enaddr[i] = lnc_inb(i * skip);
 900
 901         /*
 902          * XXX -- should check return status of if_attach
 903          */
 904
 905         ether_ifattach(&sc->arpcom.ac_if, sc->arpcom.ac_enaddr);
 906
 907         if (sc->nic.ic == LANCE || sc->nic.ic == C_LANCE)
 908                 if_printf(ifp, "%s (%s)", nic_ident[sc->nic.ident],
 909                           ic_ident[sc->nic.ic]);
 910         else
 911                 if_printf(ifp, "%s\n", ic_ident[sc->nic.ic]);
 912
 913         return (1);
 914 }
 915
 916 static void
 917 lnc_init(xsc)
 918         void *xsc;
 919 {
 920         struct lnc_softc *sc = xsc;
 921         int s, i;
 922         char *lnc_mem;
 923
 924         /* Check that interface has valid address */
 925
 926         if (TAILQ_EMPTY(&sc->arpcom.ac_if.if_addrhead)) { /* XXX unlikely */
 927 printf("XXX no address?\n");
 928                 return;
 929         }
 930
 931         /* Shut down interface */
 932
 933         s = splimp();
 934         lnc_stop(sc);
 935         sc->arpcom.ac_if.if_flags |= IFF_BROADCAST | IFF_SIMPLEX | IFF_MULTICAST; /* XXX??? */
 936
 937         /*
 938          * This sets up the memory area for the controller. Memory is set up for
 939          * the initialisation block (12 words of contiguous memory starting
 940          * on a word boundary),the transmit and receive ring structures (each
 941          * entry is 4 words long and must start on a quadword boundary) and
 942          * the data buffers.
 943          *
 944          * The alignment tests are particularly paranoid.
 945          */
 946
 947         sc->recv_next = 0;
 948         sc->trans_ring = sc->recv_ring + NDESC(sc->nrdre);
 949         sc->trans_next = 0;
 950
 951         if (sc->nic.mem_mode == SHMEM)
 952                 lnc_mem = (char *) sc->nic.iobase;
 953         else
 954                 lnc_mem = (char *) (sc->trans_ring + NDESC(sc->ntdre));
 955
 956         lnc_mem = (char *)(((int)lnc_mem + 1) & ~1);
 957         sc->init_block = (struct init_block *) ((int) lnc_mem & ~1);
 958         lnc_mem = (char *) (sc->init_block + 1);
 959         lnc_mem = (char *)(((int)lnc_mem + 7) & ~7);
 960
 961         /* Initialise pointers to descriptor entries */
 962         for (i = 0; i < NDESC(sc->nrdre); i++) {
 963                 (sc->recv_ring + i)->md = (struct mds *) lnc_mem;
 964                 lnc_mem += sizeof(struct mds);
 965         }
 966         for (i = 0; i < NDESC(sc->ntdre); i++) {
 967                 (sc->trans_ring + i)->md = (struct mds *) lnc_mem;
 968                 lnc_mem += sizeof(struct mds);
 969         }
 970
 971         /* Initialise the remaining ring entries */
 972
 973         if (sc->nic.mem_mode == DMA_MBUF) {
 974
 975                 sc->mbufs = 0;
 976                 sc->mbuf_count = 0;
 977
 978                 /* Free previously allocated mbufs */
 979                 if (sc->flags & LNC_INITIALISED)
 980                         lnc_free_mbufs(sc);
 981
 982
 983                 for (i = 0; i < NDESC(sc->nrdre); i++) {
 984                         if (alloc_mbuf_cluster(sc, sc->recv_ring+i)) {
 985                                 log(LOG_ERR, "Initialisation failed -- no mbufs\n");
 986                                 splx(s);
 987                                 return;
 988                         }
 989                 }
 990
 991                 for (i = 0; i < NDESC(sc->ntdre); i++) {
 992                         (sc->trans_ring + i)->buff.mbuf = 0;
 993                         (sc->trans_ring + i)->md->md0 = 0;
 994                         (sc->trans_ring + i)->md->md1 = 0;
 995                         (sc->trans_ring + i)->md->md2 = 0;
 996                         (sc->trans_ring + i)->md->md3 = 0;
 997                 }
 998         } else {
 999                 for (i = 0; i < NDESC(sc->nrdre); i++) {
1000                         (sc->recv_ring + i)->md->md0 = kvtop(lnc_mem);
1001                         (sc->recv_ring + i)->md->md1 = ((kvtop(lnc_mem) >> 16) & 0xff) | OWN;
1002                         (sc->recv_ring + i)->md->md2 = -RECVBUFSIZE;
1003                         (sc->recv_ring + i)->md->md3 = 0;
1004                         (sc->recv_ring + i)->buff.data = lnc_mem;
1005                         lnc_mem += RECVBUFSIZE;
1006                 }
1007                 for (i = 0; i < NDESC(sc->ntdre); i++) {
1008                         (sc->trans_ring + i)->md->md0 = kvtop(lnc_mem);
1009                         (sc->trans_ring + i)->md->md1 = ((kvtop(lnc_mem) >> 16) & 0xff);
1010                         (sc->trans_ring + i)->md->md2 = 0;
1011                         (sc->trans_ring + i)->md->md3 = 0;
1012                         (sc->trans_ring + i)->buff.data = lnc_mem;
1013                         lnc_mem += TRANSBUFSIZE;
1014                 }
1015         }
1016
1017         sc->next_to_send = 0;
1018
1019         /* Set up initialisation block */
1020
1021         sc->init_block->mode = sc->nic.mode;
1022
1023         for (i = 0; i < ETHER_ADDR_LEN; i++)
1024                 sc->init_block->padr[i] = sc->arpcom.ac_enaddr[i];
1025
1026         lnc_setladrf(sc);
1027
1028         sc->init_block->rdra = kvtop(sc->recv_ring->md);
1029         sc->init_block->rlen = ((kvtop(sc->recv_ring->md) >> 16) & 0xff) | (sc->nrdre << 13);
1030         sc->init_block->tdra = kvtop(sc->trans_ring->md);
1031         sc->init_block->tlen = ((kvtop(sc->trans_ring->md) >> 16) & 0xff) | (sc->ntdre << 13);
1032
1033
1034         /* Set flags to show that the memory area is valid */
1035         sc->flags |= LNC_INITIALISED;
1036
1037         sc->pending_transmits = 0;
1038
1039         /* Give the LANCE the physical address of the initialisation block */
1040
1041         if (sc->nic.ic == PCnet_Home) {
1042                 u_short media;
1043                 /* Set PHY_SEL to HomeRun */
1044                 media = read_bcr(sc, BCR49);
1045                 media &= ~3;
1046                 media |= 1;
1047                 write_bcr(sc, BCR49, media);
1048         }
1049
1050         write_csr(sc, CSR1, kvtop(sc->init_block));
1051         write_csr(sc, CSR2, (kvtop(sc->init_block) >> 16) & 0xff);
1052
1053         /*
1054          * Depending on which controller this is, CSR3 has different meanings.
1055          * For the Am7990 it controls DMA operations, for the Am79C960 it
1056          * controls interrupt masks and transmitter algorithms. In either
1057          * case, none of the flags are set.
1058          *
1059          */
1060
1061         write_csr(sc, CSR3, 0);
1062
1063         /* Let's see if it starts */
1064 /*
1065 printf("Enabling lnc interrupts\n");
1066         sc->arpcom.ac_if.if_timer = 10;
1067         write_csr(sc, CSR0, INIT|INEA);
1068 */
1069
1070         /*
1071          * Now that the initialisation is complete there's no reason to
1072          * access anything except CSR0, so we leave RAP pointing there
1073          * so we can just access RDP from now on, saving an outw each
1074          * time.
1075          */
1076
1077         write_csr(sc, CSR0, INIT);
1078         for(i=0; i < 1000; i++)
1079                 if (read_csr(sc, CSR0) & IDON)
1080                         break;
1081
1082         if (read_csr(sc, CSR0) & IDON) {
1083                 /*
1084                  * Enable interrupts, start the LANCE, mark the interface as
1085                  * running and transmit any pending packets.
1086                  */
1087                 write_csr(sc, CSR0, STRT | INEA);
1088                 sc->arpcom.ac_if.if_flags |= IFF_RUNNING;
1089                 sc->arpcom.ac_if.if_flags &= ~IFF_OACTIVE;
1090                 lnc_start(&sc->arpcom.ac_if);
1091         } else
1092                 log(LOG_ERR, "%s: Initialisation failed\n",
1093                     sc->arpcom.ac_if.if_xname);
1094
1095         splx(s);
1096 }
1097
1098 /*
1099  * The interrupt flag (INTR) will be set and provided that the interrupt enable
1100  * flag (INEA) is also set, the interrupt pin will be driven low when any of
1101  * the following occur:
1102  *
1103  * 1) Completion of the initialisation routine (IDON). 2) The reception of a
1104  * packet (RINT). 3) The transmission of a packet (TINT). 4) A transmitter
1105  * timeout error (BABL). 5) A missed packet (MISS). 6) A memory error (MERR).
1106  *
1107  * The interrupt flag is cleared when all of the above conditions are cleared.
1108  *
1109  * If the driver is reset from this routine then it first checks to see if any
1110  * interrupts have ocurred since the reset and handles them before returning.
1111  * This is because the NIC may signify a pending interrupt in CSR0 using the
1112  * INTR flag even if a hardware interrupt is currently inhibited (at least I
1113  * think it does from reading the data sheets). We may as well deal with
1114  * these pending interrupts now rather than get the overhead of another
1115  * hardware interrupt immediately upon returning from the interrupt handler.
1116  *
1117  */
1118
1119 void
1120 lncintr(void *arg)
1121 {
1122         lnc_softc_t *sc = arg;
1123         int unit = sc->arpcom.ac_if.if_dunit;
1124         u_short csr0;
1125
1126         /*
1127          * INEA is the only bit that can be cleared by writing a 0 to it so
1128          * we have to include it in any writes that clear other flags.
1129          */
1130
1131         while ((csr0 = lnc_inw(sc->rdp)) & INTR) {
1132
1133                 /*
1134                  * Clear interrupt flags early to avoid race conditions. The
1135                  * controller can still set these flags even while we're in
1136                  * this interrupt routine. If the flag is still set from the
1137                  * event that caused this interrupt any new events will
1138                  * be missed.
1139                  */
1140
1141                 lnc_outw(sc->rdp, csr0);
1142                 /*lnc_outw(sc->rdp, IDON | CERR | BABL | MISS | MERR | RINT | TINT | INEA);*/
1143
1144 #ifdef notyet
1145                 if (csr0 & IDON) {
1146 printf("IDON\n");
1147                         sc->arpcom.ac_if.if_timer = 0;
1148                         write_csr(sc, CSR0, STRT | INEA);
1149                         sc->arpcom.ac_if.if_flags |= IFF_RUNNING;
1150                         sc->arpcom.ac_if.if_flags &= ~IFF_OACTIVE;
1151                         lnc_start(&sc->arpcom.ac_if);
1152                         continue;
1153                 }
1154 #endif
1155
1156                 if (csr0 & ERR) {
1157                         if (csr0 & CERR) {
1158                                 log(LOG_ERR, "lnc%d: Heartbeat error -- SQE test failed\n", unit);
1159                                 LNCSTATS(cerr)
1160                         }
1161                         if (csr0 & BABL) {
1162                                 log(LOG_ERR, "lnc%d: Babble error - more than 1519 bytes transmitted\n", unit);
1163                                 LNCSTATS(babl)
1164                                 sc->arpcom.ac_if.if_oerrors++;
1165                         }
1166                         if (csr0 & MISS) {
1167                                 log(LOG_ERR, "lnc%d: Missed packet -- no receive buffer\n", unit);
1168                                 LNCSTATS(miss)
1169                                 sc->arpcom.ac_if.if_ierrors++;
1170                         }
1171                         if (csr0 & MERR) {
1172                                 log(LOG_ERR, "lnc%d: Memory error  -- Resetting\n", unit);
1173                                 LNCSTATS(merr)
1174                                 lnc_reset(sc);
1175                                 continue;
1176                         }
1177                 }
1178                 if (csr0 & RINT) {
1179                         LNCSTATS(rint)
1180                         lnc_rint(sc);
1181                 }
1182                 if (csr0 & TINT) {
1183                         LNCSTATS(tint)
1184                         sc->arpcom.ac_if.if_timer = 0;
1185                         lnc_tint(sc);
1186                 }
1187
1188                 /*
1189                  * If there's room in the transmit descriptor ring then queue
1190                  * some more transmit packets.
1191                  */
1192
1193                 if (!(sc->arpcom.ac_if.if_flags & IFF_OACTIVE))
1194                         lnc_start(&sc->arpcom.ac_if);
1195         }
1196 }
1197
1198 static __inline int
1199 mbuf_to_buffer(struct mbuf *m, char *buffer)
1200 {
1201
1202         int len=0;
1203
1204         for( ; m; m = m->m_next) {
1205                 bcopy(mtod(m, caddr_t), buffer, m->m_len);
1206                 buffer += m->m_len;
1207                 len += m->m_len;
1208         }
1209
1210         return(len);
1211 }
1212
1213 static __inline struct mbuf *
1214 chain_to_cluster(struct mbuf *m)
1215 {
1216         struct mbuf *new;
1217
1218         MGET(new, MB_DONTWAIT, MT_DATA);
1219         if (new) {
1220                 MCLGET(new, MB_DONTWAIT);
1221                 if (new->m_ext.ext_buf) {
1222                         new->m_len = mbuf_to_buffer(m, new->m_data);
1223                         m_freem(m);
1224                         return(new);
1225                 } else
1226                         m_free(new);
1227         }
1228         return(0);
1229 }
1230
1231 /*
1232  * IFF_OACTIVE and IFF_RUNNING are checked in ether_output so it's redundant
1233  * to check them again since we wouldn't have got here if they were not
1234  * appropriately set. This is also called from lnc_init and lncintr but the
1235  * flags should be ok at those points too.
1236  */
1237
1238 static void
1239 lnc_start(struct ifnet *ifp)
1240 {
1241
1242         struct lnc_softc *sc = ifp->if_softc;
1243         struct host_ring_entry *desc;
1244         int tmp;
1245         int end_of_packet;
1246         struct mbuf *head, *m;
1247         int len, chunk;
1248         int addr;
1249         int no_entries_needed;
1250
1251         do {
1252
1253                 IF_DEQUEUE(&sc->arpcom.ac_if.if_snd, head);
1254                 if (!head)
1255                         return;
1256
1257                 if (sc->nic.mem_mode == DMA_MBUF) {
1258
1259                         no_entries_needed = 0;
1260                         for (m=head; m; m = m->m_next)
1261                                 no_entries_needed++;
1262
1263                         /*
1264                          * We try and avoid bcopy as much as possible
1265                          * but there are two cases when we use it.
1266                          *
1267                          * 1) If there are not enough free entries in the ring
1268                          * to hold each mbuf in the chain then compact the
1269                          * chain into a single cluster.
1270                          *
1271                          * 2) The Am7990 and Am79C90 must not have less than
1272                          * 100 bytes in the first descriptor of a chained
1273                          * packet so it's necessary to shuffle the mbuf
1274                          * contents to ensure this.
1275                          */
1276
1277
1278                         if (no_entries_needed > (NDESC(sc->ntdre) - sc->pending_transmits)) {
1279                                 if (!(head = chain_to_cluster(head))) {
1280                                         log(LOG_ERR, "%s: Couldn't get mbuf for transmit packet -- Resetting \n ",ifp->if_xname);
1281                                         lnc_reset(sc);
1282                                         return;
1283                                 }
1284                         } else if ((sc->nic.ic == LANCE) || (sc->nic.ic == C_LANCE)) {
1285                                 if ((head->m_len < 100) && (head->m_next)) {
1286                                         len = 100 - head->m_len;
1287                                         if (M_TRAILINGSPACE(head) < len) {
1288                                                 /*
1289                                                  * Move data to start of data
1290                                                  * area. We assume the first
1291                                                  * mbuf has a packet header
1292                                                  * and is not a cluster.
1293                                                  */
1294                                                 bcopy((caddr_t)head->m_data, (caddr_t)head->m_pktdat, head->m_len);
1295                                                 head->m_data = head->m_pktdat;
1296                                         }
1297                                         m = head->m_next;
1298                                         while (m && (len > 0)) {
1299                                                 chunk = min(len, m->m_len);
1300                                                 bcopy(mtod(m, caddr_t), mtod(head, caddr_t) + head->m_len, chunk);
1301                                                 len -= chunk;
1302                                                 head->m_len += chunk;
1303                                                 m->m_len -= chunk;
1304                                                 m->m_data += chunk;
1305                                                 if (m->m_len <= 0) {
1306                                                         m = m_free(m);
1307                                                         head->m_next = m;
1308                                                 }
1309                                         }
1310                                 }
1311                         }
1312
1313                         tmp = sc->next_to_send;
1314
1315                         /*
1316                          * On entering this loop we know that tmp points to a
1317                          * descriptor with a clear OWN bit.
1318                          */
1319
1320                         desc = sc->trans_ring + tmp;
1321                         len = ETHER_MIN_LEN;
1322                         for (m = head; m; m = m->m_next) {
1323                                 desc->buff.mbuf = m;
1324                                 addr = kvtop(m->m_data);
1325                                 desc->md->md0 = addr;
1326                                 desc->md->md1 = ((addr >> 16) & 0xff);
1327                                 desc->md->md3 = 0;
1328                                 desc->md->md2 = -m->m_len;
1329                                 sc->pending_transmits++;
1330                                 len -= m->m_len;
1331
1332                                 INC_MD_PTR(tmp, sc->ntdre)
1333                                 desc = sc->trans_ring + tmp;
1334                         }
1335
1336                         end_of_packet = tmp;
1337                         DEC_MD_PTR(tmp, sc->ntdre)
1338                         desc = sc->trans_ring + tmp;
1339                         desc->md->md1 |= ENP;
1340
1341                         if (len > 0)
1342                                 desc->md->md2 -= len;
1343
1344                         /*
1345                          * Set OWN bits in reverse order, otherwise the Lance
1346                          * could start sending the packet before all the
1347                          * buffers have been relinquished by the host.
1348                          */
1349
1350                         while (tmp != sc->next_to_send) {
1351                                 desc->md->md1 |= OWN;
1352                                 DEC_MD_PTR(tmp, sc->ntdre)
1353                                 desc = sc->trans_ring + tmp;
1354                         }
1355                         sc->next_to_send = end_of_packet;
1356                         desc->md->md1 |= STP | OWN;
1357                 } else {
1358                         sc->pending_transmits++;
1359                         desc = sc->trans_ring + sc->next_to_send;
1360                         len = mbuf_to_buffer(head, desc->buff.data);
1361                         desc->md->md3 = 0;
1362                         desc->md->md2 = -max(len, ETHER_MIN_LEN - ETHER_CRC_LEN);
1363                         desc->md->md1 |= OWN | STP | ENP;
1364                         INC_MD_PTR(sc->next_to_send, sc->ntdre)
1365                 }
1366
1367                 /* Force an immediate poll of the transmit ring */
1368                 lnc_outw(sc->rdp, TDMD | INEA);
1369
1370                 /*
1371                  * Set a timer so if the buggy Am7990.h shuts
1372                  * down we can wake it up.
1373                  */
1374
1375                 ifp->if_timer = 2;
1376
1377                 if (sc->arpcom.ac_if.if_bpf)
1378                         bpf_mtap(&sc->arpcom.ac_if, head);
1379
1380                 if (sc->nic.mem_mode != DMA_MBUF)
1381                         m_freem(head);
1382
1383         } while (sc->pending_transmits < NDESC(sc->ntdre));
1384
1385         /*
1386          * Transmit ring is full so set IFF_OACTIVE
1387          * since we can't buffer any more packets.
1388          */
1389
1390         sc->arpcom.ac_if.if_flags |= IFF_OACTIVE;
1391         LNCSTATS(trans_ring_full)
1392 }
1393
1394 static int
1395 lnc_ioctl(struct ifnet * ifp, u_long command, caddr_t data, struct ucred *cr)
1396 {
1397
1398         struct lnc_softc *sc = ifp->if_softc;
1399         int s, error = 0;
1400
1401         s = splimp();
1402
1403         switch (command) {
1404         case SIOCSIFADDR:
1405         case SIOCGIFADDR:
1406         case SIOCSIFMTU:
1407                 error = ether_ioctl(ifp, command, data);
1408                 break;
1409
1410         case SIOCSIFFLAGS:
1411 #ifdef DEBUG
1412                 if (ifp->if_flags & IFF_DEBUG)
1413                         sc->lnc_debug = 1;
1414                 else
1415                         sc->lnc_debug = 0;
1416 #endif
1417                 if (ifp->if_flags & IFF_PROMISC) {
1418                         if (!(sc->nic.mode & PROM)) {
1419                                 sc->nic.mode |= PROM;
1420                                 lnc_init(sc);
1421                         }
1422                 } else if (sc->nic.mode & PROM) {
1423                         sc->nic.mode &= ~PROM;
1424                         lnc_init(sc);
1425                 }
1426
1427                 if ((ifp->if_flags & IFF_ALLMULTI) &&
1428                     !(sc->flags & LNC_ALLMULTI)) {
1429                         sc->flags |= LNC_ALLMULTI;
1430                         lnc_init(sc);
1431                 } else if (!(ifp->if_flags & IFF_ALLMULTI) &&
1432                             (sc->flags & LNC_ALLMULTI)) {
1433                         sc->flags &= ~LNC_ALLMULTI;
1434                         lnc_init(sc);
1435                 }
1436
1437                 if ((ifp->if_flags & IFF_UP) == 0 &&
1438                     (ifp->if_flags & IFF_RUNNING) != 0) {
1439                         /*
1440                          * If interface is marked down and it is running,
1441                          * then stop it.
1442                          */
1443                         lnc_stop(sc);
1444                         ifp->if_flags &= ~IFF_RUNNING;
1445                 } else if ((ifp->if_flags & IFF_UP) != 0 &&
1446                            (ifp->if_flags & IFF_RUNNING) == 0) {
1447                         /*
1448                          * If interface is marked up and it is stopped, then
1449                          * start it.
1450                          */
1451                         lnc_init(sc);
1452                 }
1453                 break;
1454         case SIOCADDMULTI:
1455         case SIOCDELMULTI:
1456                 lnc_init(sc);
1457                 error = 0;
1458                 break;
1459         default:
1460                 error = EINVAL;
1461         }
1462         (void) splx(s);
1463         return error;
1464 }
1465
1466 static void
1467 lnc_watchdog(struct ifnet *ifp)
1468 {
1469         log(LOG_ERR, "%s: Device timeout -- Resetting\n", ifp->if_xname);
1470         ifp->if_oerrors++;
1471         lnc_reset(ifp->if_softc);
1472 }
1473
1474 #ifdef DEBUG
1475 void
1476 lnc_dump_state(struct lnc_softc *sc)
1477 {
1478         int             i;
1479
1480         printf("\nDriver/NIC [%d] state dump\n", sc->arpcom.ac_if.if_dunit);
1481         printf("Memory access mode: %b\n", sc->nic.mem_mode, MEM_MODES);
1482         printf("Host memory\n");
1483         printf("-----------\n");
1484
1485         printf("Receive ring: base = %p, next = %p\n",
1486             (void *)sc->recv_ring, (void *)(sc->recv_ring + sc->recv_next));
1487         for (i = 0; i < NDESC(sc->nrdre); i++)
1488                 printf("\t%d:%p md = %p buff = %p\n",
1489                     i, (void *)(sc->recv_ring + i),
1490                     (void *)(sc->recv_ring + i)->md,
1491                     (void *)(sc->recv_ring + i)->buff.data);
1492
1493         printf("Transmit ring: base = %p, next = %p\n",
1494             (void *)sc->trans_ring, (void *)(sc->trans_ring + sc->trans_next));
1495         for (i = 0; i < NDESC(sc->ntdre); i++)
1496                 printf("\t%d:%p md = %p buff = %p\n",
1497                     i, (void *)(sc->trans_ring + i),
1498                     (void *)(sc->trans_ring + i)->md,
1499                     (void *)(sc->trans_ring + i)->buff.data);
1500         printf("Lance memory (may be on host(DMA) or card(SHMEM))\n");
1501         printf("Init block = %p\n", (void *)sc->init_block);
1502         printf("\tmode = %b rlen:rdra = %x:%x tlen:tdra = %x:%x\n",
1503             sc->init_block->mode, INIT_MODE, sc->init_block->rlen,
1504           sc->init_block->rdra, sc->init_block->tlen, sc->init_block->tdra);
1505         printf("Receive descriptor ring\n");
1506         for (i = 0; i < NDESC(sc->nrdre); i++)
1507                 printf("\t%d buffer = 0x%x%x, BCNT = %d,\tMCNT = %u,\tflags = %b\n",
1508                     i, ((sc->recv_ring + i)->md->md1 & HADR),
1509                     (sc->recv_ring + i)->md->md0,
1510                     -(short) (sc->recv_ring + i)->md->md2,
1511                     (sc->recv_ring + i)->md->md3,
1512                     (((sc->recv_ring + i)->md->md1 & ~HADR) >> 8), RECV_MD1);
1513         printf("Transmit descriptor ring\n");
1514         for (i = 0; i < NDESC(sc->ntdre); i++)
1515                 printf("\t%d buffer = 0x%x%x, BCNT = %d,\tflags = %b %b\n",
1516                     i, ((sc->trans_ring + i)->md->md1 & HADR),
1517                     (sc->trans_ring + i)->md->md0,
1518                     -(short) (sc->trans_ring + i)->md->md2,
1519                     ((sc->trans_ring + i)->md->md1 >> 8), TRANS_MD1,
1520                     ((sc->trans_ring + i)->md->md3 >> 10), TRANS_MD3);
1521         printf("\nnext_to_send = %x\n", sc->next_to_send);
1522         printf("\n CSR0 = %b CSR1 = %x CSR2 = %x CSR3 = %x\n\n",
1523             read_csr(sc, CSR0), CSR0_FLAGS, read_csr(sc, CSR1),
1524             read_csr(sc, CSR2), read_csr(sc, CSR3));
1525
1526         /* Set RAP back to CSR0 */
1527         lnc_outw(sc->rap, CSR0);
1528 }
1529
1530 void
1531 mbuf_dump_chain(struct mbuf * m)
1532 {
1533
1534 #define MBUF_FLAGS \
1535         "\20\1M_EXT\2M_PKTHDR\3M_EOR\4UNKNOWN\5M_BCAST\6M_MCAST"
1536
1537         if (!m)
1538                 log(LOG_DEBUG, "m == NULL\n");
1539         do {
1540                 log(LOG_DEBUG, "m = %p\n", (void *)m);
1541                 log(LOG_DEBUG, "m_hdr.mh_next = %p\n",
1542                     (void *)m->m_hdr.mh_next);
1543                 log(LOG_DEBUG, "m_hdr.mh_nextpkt = %p\n",
1544                     (void *)m->m_hdr.mh_nextpkt);
1545                 log(LOG_DEBUG, "m_hdr.mh_len = %d\n", m->m_hdr.mh_len);
1546                 log(LOG_DEBUG, "m_hdr.mh_data = %p\n",
1547                     (void *)m->m_hdr.mh_data);
1548                 log(LOG_DEBUG, "m_hdr.mh_type = %d\n", m->m_hdr.mh_type);
1549                 log(LOG_DEBUG, "m_hdr.mh_flags = %b\n", m->m_hdr.mh_flags,
1550                     MBUF_FLAGS);
1551                 if (!(m->m_hdr.mh_flags & (M_PKTHDR | M_EXT)))
1552                         log(LOG_DEBUG, "M_dat.M_databuf = %p\n",
1553                             (void *)m->M_dat.M_databuf);
1554                 else {
1555                         if (m->m_hdr.mh_flags & M_PKTHDR) {
1556                                 log(LOG_DEBUG, "M_dat.MH.MH_pkthdr.len = %d\n",
1557                                     m->M_dat.MH.MH_pkthdr.len);
1558                                 log(LOG_DEBUG,
1559                                     "M_dat.MH.MH_pkthdr.rcvif = %p\n",
1560                                     (void *)m->M_dat.MH.MH_pkthdr.rcvif);
1561                                 if (!(m->m_hdr.mh_flags & M_EXT))
1562                                         log(LOG_DEBUG,
1563                                             "M_dat.MH.MH_dat.MH_databuf = %p\n",
1564                                         (void *)m->M_dat.MH.MH_dat.MH_databuf);
1565                         }
1566                         if (m->m_hdr.mh_flags & M_EXT) {
1567                                 log(LOG_DEBUG,
1568                                     "M_dat.MH.MH_dat.MH_ext.ext_buff %p\n",
1569                                     (void *)m->M_dat.MH.MH_dat.MH_ext.ext_buf);
1570                                 log(LOG_DEBUG,
1571                                     "M_dat.MH.MH_dat.MH_ext.ext_free %p\n",
1572                                     (void *)m->M_dat.MH.MH_dat.MH_ext.ext_nfree.old);
1573                                 log(LOG_DEBUG,
1574                                     "M_dat.MH.MH_dat.MH_ext.ext_size %d\n",
1575                                     m->M_dat.MH.MH_dat.MH_ext.ext_size);
1576                         }
1577                 }
1578         } while ((m = m->m_next) != NULL);
1579 }
1580 #endif