The Design and Implementation of the FreeBSD Operating System, Second Edition
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FreeBSD/Linux Kernel Cross Reference
sys/dev/le/am79900.c

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    1 /*      $NetBSD: am79900.c,v 1.17 2005/12/24 20:27:29 perry Exp $       */
    2 
    3 /*-
    4  * Copyright (c) 1997 The NetBSD Foundation, Inc.
    5  * All rights reserved.
    6  *
    7  * This code is derived from software contributed to The NetBSD Foundation
    8  * by Jason R. Thorpe.
    9  *
   10  * Redistribution and use in source and binary forms, with or without
   11  * modification, are permitted provided that the following conditions
   12  * are met:
   13  * 1. Redistributions of source code must retain the above copyright
   14  *    notice, this list of conditions and the following disclaimer.
   15  * 2. Redistributions in binary form must reproduce the above copyright
   16  *    notice, this list of conditions and the following disclaimer in the
   17  *    documentation and/or other materials provided with the distribution.
   18  * 3. All advertising materials mentioning features or use of this software
   19  *    must display the following acknowledgement:
   20  *      This product includes software developed by the NetBSD
   21  *      Foundation, Inc. and its contributors.
   22  * 4. Neither the name of The NetBSD Foundation nor the names of its
   23  *    contributors may be used to endorse or promote products derived
   24  *    from this software without specific prior written permission.
   25  *
   26  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
   27  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
   28  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
   29  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
   30  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
   31  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
   32  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
   33  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
   34  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
   35  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
   36  * POSSIBILITY OF SUCH DAMAGE.
   37  */
   38 
   39 /*-
   40  * Copyright (c) 1992, 1993
   41  *      The Regents of the University of California.  All rights reserved.
   42  *
   43  * This code is derived from software contributed to Berkeley by
   44  * Ralph Campbell and Rick Macklem.
   45  *
   46  * Redistribution and use in source and binary forms, with or without
   47  * modification, are permitted provided that the following conditions
   48  * are met:
   49  * 1. Redistributions of source code must retain the above copyright
   50  *    notice, this list of conditions and the following disclaimer.
   51  * 2. Redistributions in binary form must reproduce the above copyright
   52  *    notice, this list of conditions and the following disclaimer in the
   53  *    documentation and/or other materials provided with the distribution.
   54  * 3. Neither the name of the University nor the names of its contributors
   55  *    may be used to endorse or promote products derived from this software
   56  *    without specific prior written permission.
   57  *
   58  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   59  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   60  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   61  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   62  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   63  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   64  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   65  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   66  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   67  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   68  * SUCH DAMAGE.
   69  *
   70  *      @(#)if_le.c     8.2 (Berkeley) 11/16/93
   71  */
   72 
   73 /*-
   74  * Copyright (c) 1998
   75  *      Matthias Drochner.  All rights reserved.
   76  * Copyright (c) 1995 Charles M. Hannum.  All rights reserved.
   77  *
   78  * This code is derived from software contributed to Berkeley by
   79  * Ralph Campbell and Rick Macklem.
   80  *
   81  * Redistribution and use in source and binary forms, with or without
   82  * modification, are permitted provided that the following conditions
   83  * are met:
   84  * 1. Redistributions of source code must retain the above copyright
   85  *    notice, this list of conditions and the following disclaimer.
   86  * 2. Redistributions in binary form must reproduce the above copyright
   87  *    notice, this list of conditions and the following disclaimer in the
   88  *    documentation and/or other materials provided with the distribution.
   89  * 3. All advertising materials mentioning features or use of this software
   90  *    must display the following acknowledgement:
   91  *      This product includes software developed by the University of
   92  *      California, Berkeley and its contributors.
   93  * 4. Neither the name of the University nor the names of its contributors
   94  *    may be used to endorse or promote products derived from this software
   95  *    without specific prior written permission.
   96  *
   97  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   98  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   99  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  100  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  101  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  102  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  103  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  104  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  105  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  106  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  107  * SUCH DAMAGE.
  108  *
  109  *      @(#)if_le.c     8.2 (Berkeley) 11/16/93
  110  */
  111 
  112 #include <sys/cdefs.h>
  113 __FBSDID("$FreeBSD$");
  114 
  115 #include <sys/param.h>
  116 #include <sys/bus.h>
  117 #include <sys/endian.h>
  118 #include <sys/lock.h>
  119 #include <sys/mbuf.h>
  120 #include <sys/mutex.h>
  121 #include <sys/socket.h>
  122 
  123 #include <net/bpf.h>
  124 #include <net/ethernet.h>
  125 #include <net/if.h>
  126 #include <net/if_arp.h>
  127 #include <net/if_dl.h>
  128 #include <net/if_media.h>
  129 #include <net/if_var.h>
  130 
  131 #include <machine/bus.h>
  132 
  133 #include <dev/le/lancereg.h>
  134 #include <dev/le/lancevar.h>
  135 #include <dev/le/am79900reg.h>
  136 #include <dev/le/am79900var.h>
  137 
  138 static void     am79900_meminit(struct lance_softc *);
  139 static void     am79900_rint(struct lance_softc *);
  140 static void     am79900_tint(struct lance_softc *);
  141 static void     am79900_start_locked(struct lance_softc *sc);
  142 
  143 #ifdef LEDEBUG
  144 static void     am79900_recv_print(struct lance_softc *, int);
  145 static void     am79900_xmit_print(struct lance_softc *, int);
  146 #endif
  147 
  148 int
  149 am79900_config(struct am79900_softc *sc, const char* name, int unit)
  150 {
  151         int error, mem;
  152 
  153         sc->lsc.sc_meminit = am79900_meminit;
  154         sc->lsc.sc_start_locked = am79900_start_locked;
  155 
  156         error = lance_config(&sc->lsc, name, unit);
  157         if (error != 0)
  158                 return (error);
  159 
  160         mem = 0;
  161         sc->lsc.sc_initaddr = mem;
  162         mem += sizeof(struct leinit);
  163         sc->lsc.sc_rmdaddr = mem;
  164         mem += sizeof(struct lermd) * sc->lsc.sc_nrbuf;
  165         sc->lsc.sc_tmdaddr = mem;
  166         mem += sizeof(struct letmd) * sc->lsc.sc_ntbuf;
  167         sc->lsc.sc_rbufaddr = mem;
  168         mem += LEBLEN * sc->lsc.sc_nrbuf;
  169         sc->lsc.sc_tbufaddr = mem;
  170         mem += LEBLEN * sc->lsc.sc_ntbuf;
  171 
  172         if (mem > sc->lsc.sc_memsize)
  173                 panic("%s: memsize", __func__);
  174 
  175         lance_attach(&sc->lsc);
  176 
  177         return (0);
  178 }
  179 
  180 void
  181 am79900_detach(struct am79900_softc *sc)
  182 {
  183 
  184         lance_detach(&sc->lsc);
  185 }
  186 
  187 /*
  188  * Set up the initialization block and the descriptor rings.
  189  */
  190 static void
  191 am79900_meminit(struct lance_softc *sc)
  192 {
  193         struct ifnet *ifp = sc->sc_ifp;
  194         struct leinit init;
  195         struct lermd rmd;
  196         struct letmd tmd;
  197         u_long a;
  198         int bix;
  199 
  200         LE_LOCK_ASSERT(sc, MA_OWNED);
  201 
  202         if (ifp->if_flags & IFF_PROMISC)
  203                 init.init_mode = LE_HTOLE32(LE_MODE_NORMAL | LE_MODE_PROM);
  204         else
  205                 init.init_mode = LE_HTOLE32(LE_MODE_NORMAL);
  206 
  207         init.init_mode |= LE_HTOLE32(((ffs(sc->sc_ntbuf) - 1) << 28) |
  208             ((ffs(sc->sc_nrbuf) - 1) << 20));
  209 
  210         init.init_padr[0] = LE_HTOLE32(sc->sc_enaddr[0] |
  211             (sc->sc_enaddr[1] << 8) | (sc->sc_enaddr[2] << 16) |
  212             (sc->sc_enaddr[3] << 24));
  213         init.init_padr[1] = LE_HTOLE32(sc->sc_enaddr[4] |
  214             (sc->sc_enaddr[5] << 8));
  215         lance_setladrf(sc, init.init_ladrf);
  216 
  217         sc->sc_last_rd = 0;
  218         sc->sc_first_td = sc->sc_last_td = sc->sc_no_td = 0;
  219 
  220         a = sc->sc_addr + LE_RMDADDR(sc, 0);
  221         init.init_rdra = LE_HTOLE32(a);
  222 
  223         a = sc->sc_addr + LE_TMDADDR(sc, 0);
  224         init.init_tdra = LE_HTOLE32(a);
  225 
  226         (*sc->sc_copytodesc)(sc, &init, LE_INITADDR(sc), sizeof(init));
  227 
  228         /*
  229          * Set up receive ring descriptors.
  230          */
  231         for (bix = 0; bix < sc->sc_nrbuf; bix++) {
  232                 a = sc->sc_addr + LE_RBUFADDR(sc, bix);
  233                 rmd.rmd0 = LE_HTOLE32(a);
  234                 rmd.rmd1 = LE_HTOLE32(LE_R1_OWN | LE_R1_ONES |
  235                     (-LEBLEN & 0xfff));
  236                 rmd.rmd2 = 0;
  237                 rmd.rmd3 = 0;
  238                 (*sc->sc_copytodesc)(sc, &rmd, LE_RMDADDR(sc, bix),
  239                     sizeof(rmd));
  240         }
  241 
  242         /*
  243          * Set up transmit ring descriptors.
  244          */
  245         for (bix = 0; bix < sc->sc_ntbuf; bix++) {
  246                 a = sc->sc_addr + LE_TBUFADDR(sc, bix);
  247                 tmd.tmd0 = LE_HTOLE32(a);
  248                 tmd.tmd1 = LE_HTOLE32(LE_T1_ONES);
  249                 tmd.tmd2 = 0;
  250                 tmd.tmd3 = 0;
  251                 (*sc->sc_copytodesc)(sc, &tmd, LE_TMDADDR(sc, bix),
  252                     sizeof(tmd));
  253         }
  254 }
  255 
  256 static inline void
  257 am79900_rint(struct lance_softc *sc)
  258 {
  259         struct ifnet *ifp = sc->sc_ifp;
  260         struct mbuf *m;
  261         struct lermd rmd;
  262         uint32_t rmd1;
  263         int bix, rp;
  264 #if defined(__i386__) && !defined(PC98)
  265         struct ether_header *eh;
  266 #endif
  267 
  268         bix = sc->sc_last_rd;
  269 
  270         /* Process all buffers with valid data. */
  271         for (;;) {
  272                 rp = LE_RMDADDR(sc, bix);
  273                 (*sc->sc_copyfromdesc)(sc, &rmd, rp, sizeof(rmd));
  274 
  275                 rmd1 = LE_LE32TOH(rmd.rmd1);
  276                 if (rmd1 & LE_R1_OWN)
  277                         break;
  278 
  279                 m = NULL;
  280                 if ((rmd1 & (LE_R1_ERR | LE_R1_STP | LE_R1_ENP)) !=
  281                     (LE_R1_STP | LE_R1_ENP)){
  282                         if (rmd1 & LE_R1_ERR) {
  283 #ifdef LEDEBUG
  284                                 if (rmd1 & LE_R1_ENP) {
  285                                         if ((rmd1 & LE_R1_OFLO) == 0) {
  286                                                 if (rmd1 & LE_R1_FRAM)
  287                                                         if_printf(ifp,
  288                                                             "framing error\n");
  289                                                 if (rmd1 & LE_R1_CRC)
  290                                                         if_printf(ifp,
  291                                                             "crc mismatch\n");
  292                                         }
  293                                 } else
  294                                         if (rmd1 & LE_R1_OFLO)
  295                                                 if_printf(ifp, "overflow\n");
  296 #endif
  297                                 if (rmd1 & LE_R1_BUFF)
  298                                         if_printf(ifp,
  299                                             "receive buffer error\n");
  300                         } else if ((rmd1 & (LE_R1_STP | LE_R1_ENP)) !=
  301                             (LE_R1_STP | LE_R1_ENP))
  302                                 if_printf(ifp, "dropping chained buffer\n");
  303                 } else {
  304 #ifdef LEDEBUG
  305                         if (sc->sc_flags & LE_DEBUG)
  306                                 am79900_recv_print(sc, bix);
  307 #endif
  308                         /* Pull the packet off the interface. */
  309                         m = lance_get(sc, LE_RBUFADDR(sc, bix),
  310                             (LE_LE32TOH(rmd.rmd2) & 0xfff) - ETHER_CRC_LEN);
  311                 }
  312 
  313                 rmd.rmd1 = LE_HTOLE32(LE_R1_OWN | LE_R1_ONES |
  314                     (-LEBLEN & 0xfff));
  315                 rmd.rmd2 = 0;
  316                 rmd.rmd3 = 0;
  317                 (*sc->sc_copytodesc)(sc, &rmd, rp, sizeof(rmd));
  318 
  319                 if (++bix == sc->sc_nrbuf)
  320                         bix = 0;
  321 
  322                 if (m != NULL) {
  323                         ifp->if_ipackets++;
  324 
  325 #if defined(__i386__) && !defined(PC98)
  326                         /*
  327                          * The VMware LANCE does not present IFF_SIMPLEX
  328                          * behavior on multicast packets. Thus drop the
  329                          * packet if it is from ourselves.
  330                          */
  331                         eh = mtod(m, struct ether_header *);
  332                         if (!ether_cmp(eh->ether_shost, sc->sc_enaddr)) {
  333                                 m_freem(m);
  334                                 continue;
  335                         }
  336 #endif
  337 
  338                         /* Pass the packet up. */
  339                         LE_UNLOCK(sc);
  340                         (*ifp->if_input)(ifp, m);
  341                         LE_LOCK(sc);
  342                 } else
  343                         ifp->if_ierrors++;
  344         }
  345 
  346         sc->sc_last_rd = bix;
  347 }
  348 
  349 static inline void
  350 am79900_tint(struct lance_softc *sc)
  351 {
  352         struct ifnet *ifp = sc->sc_ifp;
  353         struct letmd tmd;
  354         uint32_t tmd1, tmd2;
  355         int bix;
  356 
  357         bix = sc->sc_first_td;
  358 
  359         for (;;) {
  360                 if (sc->sc_no_td <= 0)
  361                         break;
  362 
  363                 (*sc->sc_copyfromdesc)(sc, &tmd, LE_TMDADDR(sc, bix),
  364                     sizeof(tmd));
  365 
  366                 tmd1 = LE_LE32TOH(tmd.tmd1);
  367 
  368 #ifdef LEDEBUG
  369                 if (sc->sc_flags & LE_DEBUG)
  370                         if_printf(ifp, "trans tmd: "
  371                             "adr %08x, flags/blen %08x\n",
  372                             LE_LE32TOH(tmd.tmd0), tmd1);
  373 #endif
  374 
  375                 if (tmd1 & LE_T1_OWN)
  376                         break;
  377 
  378                 ifp->if_drv_flags &= ~IFF_DRV_OACTIVE;
  379 
  380                 if (tmd1 & LE_T1_ERR) {
  381                         tmd2 = LE_LE32TOH(tmd.tmd2);
  382                         if (tmd2 & LE_T2_BUFF)
  383                                 if_printf(ifp, "transmit buffer error\n");
  384                         else if (tmd2 & LE_T2_UFLO)
  385                                 if_printf(ifp, "underflow\n");
  386                         if (tmd2 & (LE_T2_BUFF | LE_T2_UFLO)) {
  387                                 lance_init_locked(sc);
  388                                 return;
  389                         }
  390                         if (tmd2 & LE_T2_LCAR) {
  391                                 if (sc->sc_flags & LE_CARRIER)
  392                                         if_link_state_change(ifp,
  393                                             LINK_STATE_DOWN);
  394                                 sc->sc_flags &= ~LE_CARRIER;
  395                                 if (sc->sc_nocarrier)
  396                                         (*sc->sc_nocarrier)(sc);
  397                                 else
  398                                         if_printf(ifp, "lost carrier\n");
  399                         }
  400                         if (tmd2 & LE_T2_LCOL)
  401                                 ifp->if_collisions++;
  402                         if (tmd2 & LE_T2_RTRY) {
  403 #ifdef LEDEBUG
  404                                 if_printf(ifp, "excessive collisions\n");
  405 #endif
  406                                 ifp->if_collisions += 16;
  407                         }
  408                         ifp->if_oerrors++;
  409                 } else {
  410                         if (tmd1 & LE_T1_ONE)
  411                                 ifp->if_collisions++;
  412                         else if (tmd1 & LE_T1_MORE)
  413                                 /* Real number is unknown. */
  414                                 ifp->if_collisions += 2;
  415                         ifp->if_opackets++;
  416                 }
  417 
  418                 if (++bix == sc->sc_ntbuf)
  419                         bix = 0;
  420 
  421                 --sc->sc_no_td;
  422         }
  423 
  424         sc->sc_first_td = bix;
  425 
  426         sc->sc_wdog_timer = sc->sc_no_td > 0 ? 5 : 0;
  427 }
  428 
  429 /*
  430  * Controller interrupt
  431  */
  432 void
  433 am79900_intr(void *arg)
  434 {
  435         struct lance_softc *sc = arg;
  436         struct ifnet *ifp = sc->sc_ifp;
  437         uint16_t isr;
  438 
  439         LE_LOCK(sc);
  440 
  441         if (sc->sc_hwintr && (*sc->sc_hwintr)(sc) == -1) {
  442                 ifp->if_ierrors++;
  443                 lance_init_locked(sc);
  444                 LE_UNLOCK(sc);
  445                 return;
  446         }
  447 
  448         isr = (*sc->sc_rdcsr)(sc, LE_CSR0);
  449 #if defined(LEDEBUG) && LEDEBUG > 1
  450         if (sc->sc_flags & LE_DEBUG)
  451                 if_printf(ifp, "%s: entering with isr=%04x\n", __func__, isr);
  452 #endif
  453         if ((isr & LE_C0_INTR) == 0) {
  454                 LE_UNLOCK(sc);
  455                 return;
  456         }
  457 
  458         /*
  459          * Clear interrupt source flags and turn off interrupts. If we
  460          * don't clear these flags before processing their sources we
  461          * could completely miss some interrupt events as the NIC can
  462          * change these flags while we're in this handler. We toggle
  463          * the interrupt enable bit in order to keep receiving them
  464          * (some chips work without this, some don't).
  465          */
  466         (*sc->sc_wrcsr)(sc, LE_CSR0, isr & ~(LE_C0_INEA | LE_C0_TDMD |
  467             LE_C0_STOP | LE_C0_STRT | LE_C0_INIT));
  468 
  469         if (isr & LE_C0_ERR) {
  470                 if (isr & LE_C0_BABL) {
  471 #ifdef LEDEBUG
  472                         if_printf(ifp, "babble\n");
  473 #endif
  474                         ifp->if_oerrors++;
  475                 }
  476 #if 0
  477                 if (isr & LE_C0_CERR) {
  478                         if_printf(ifp, "collision error\n");
  479                         ifp->if_collisions++;
  480                 }
  481 #endif
  482                 if (isr & LE_C0_MISS) {
  483 #ifdef LEDEBUG
  484                         if_printf(ifp, "missed packet\n");
  485 #endif
  486                         ifp->if_ierrors++;
  487                 }
  488                 if (isr & LE_C0_MERR) {
  489                         if_printf(ifp, "memory error\n");
  490                         lance_init_locked(sc);
  491                         LE_UNLOCK(sc);
  492                         return;
  493                 }
  494         }
  495 
  496         if ((isr & LE_C0_RXON) == 0) {
  497                 if_printf(ifp, "receiver disabled\n");
  498                 ifp->if_ierrors++;
  499                 lance_init_locked(sc);
  500                 LE_UNLOCK(sc);
  501                 return;
  502         }
  503         if ((isr & LE_C0_TXON) == 0) {
  504                 if_printf(ifp, "transmitter disabled\n");
  505                 ifp->if_oerrors++;
  506                 lance_init_locked(sc);
  507                 LE_UNLOCK(sc);
  508                 return;
  509         }
  510 
  511         /*
  512          * Pretend we have carrier; if we don't this will be cleared shortly.
  513          */
  514         if (!(sc->sc_flags & LE_CARRIER))
  515                 if_link_state_change(ifp, LINK_STATE_UP);
  516         sc->sc_flags |= LE_CARRIER;
  517 
  518         if (isr & LE_C0_RINT)
  519                 am79900_rint(sc);
  520         if (isr & LE_C0_TINT)
  521                 am79900_tint(sc);
  522 
  523         /* Enable interrupts again. */
  524         (*sc->sc_wrcsr)(sc, LE_CSR0, LE_C0_INEA);
  525 
  526         if (!IFQ_DRV_IS_EMPTY(&ifp->if_snd))
  527                 am79900_start_locked(sc);
  528 
  529         LE_UNLOCK(sc);
  530 }
  531 
  532 /*
  533  * Set up output on interface.
  534  * Get another datagram to send off of the interface queue, and map it to the
  535  * interface before starting the output.
  536  */
  537 static void
  538 am79900_start_locked(struct lance_softc *sc)
  539 {
  540         struct ifnet *ifp = sc->sc_ifp;
  541         struct letmd tmd;
  542         struct mbuf *m;
  543         int bix, enq, len, rp;
  544 
  545         LE_LOCK_ASSERT(sc, MA_OWNED);
  546 
  547         if ((ifp->if_drv_flags & (IFF_DRV_RUNNING | IFF_DRV_OACTIVE)) !=
  548             IFF_DRV_RUNNING)
  549                 return;
  550 
  551         bix = sc->sc_last_td;
  552         enq = 0;
  553 
  554         for (; sc->sc_no_td < sc->sc_ntbuf &&
  555             !IFQ_DRV_IS_EMPTY(&ifp->if_snd);) {
  556                 rp = LE_TMDADDR(sc, bix);
  557                 (*sc->sc_copyfromdesc)(sc, &tmd, rp, sizeof(tmd));
  558 
  559                 if (LE_LE32TOH(tmd.tmd1) & LE_T1_OWN) {
  560                         ifp->if_drv_flags |= IFF_DRV_OACTIVE;
  561                         if_printf(ifp,
  562                             "missing buffer, no_td = %d, last_td = %d\n",
  563                             sc->sc_no_td, sc->sc_last_td);
  564                 }
  565 
  566                 IFQ_DRV_DEQUEUE(&ifp->if_snd, m);
  567                 if (m == 0)
  568                         break;
  569 
  570                 /*
  571                  * If BPF is listening on this interface, let it see the packet
  572                  * before we commit it to the wire.
  573                  */
  574                 BPF_MTAP(ifp, m);
  575 
  576                 /*
  577                  * Copy the mbuf chain into the transmit buffer.
  578                  */
  579                 len = lance_put(sc, LE_TBUFADDR(sc, bix), m);
  580 
  581 #ifdef LEDEBUG
  582                 if (len > ETHERMTU + ETHER_HDR_LEN)
  583                         if_printf(ifp, "packet length %d\n", len);
  584 #endif
  585 
  586                 /*
  587                  * Init transmit registers, and set transmit start flag.
  588                  */
  589                 tmd.tmd1 = LE_HTOLE32(LE_T1_OWN | LE_T1_STP | LE_T1_ENP |
  590                     LE_T1_ONES | (-len & 0xfff));
  591                 tmd.tmd2 = 0;
  592                 tmd.tmd3 = 0;
  593 
  594                 (*sc->sc_copytodesc)(sc, &tmd, rp, sizeof(tmd));
  595 
  596 #ifdef LEDEBUG
  597                 if (sc->sc_flags & LE_DEBUG)
  598                         am79900_xmit_print(sc, bix);
  599 #endif
  600 
  601                 (*sc->sc_wrcsr)(sc, LE_CSR0, LE_C0_INEA | LE_C0_TDMD);
  602                 enq++;
  603 
  604                 if (++bix == sc->sc_ntbuf)
  605                         bix = 0;
  606 
  607                 if (++sc->sc_no_td == sc->sc_ntbuf) {
  608                         ifp->if_drv_flags |= IFF_DRV_OACTIVE;
  609                         break;
  610                 }
  611         }
  612 
  613         sc->sc_last_td = bix;
  614 
  615         if (enq > 0)
  616                 sc->sc_wdog_timer = 5;
  617 }
  618 
  619 #ifdef LEDEBUG
  620 static void
  621 am79900_recv_print(struct lance_softc *sc, int no)
  622 {
  623         struct ifnet *ifp = sc->sc_ifp;
  624         struct ether_header eh;
  625         struct lermd rmd;
  626         uint16_t len;
  627 
  628         (*sc->sc_copyfromdesc)(sc, &rmd, LE_RMDADDR(sc, no), sizeof(rmd));
  629         len = LE_LE32TOH(rmd.rmd2) & 0xfff;
  630         if_printf(ifp, "receive buffer %d, len = %d\n", no, len);
  631         if_printf(ifp, "status %04x\n", (*sc->sc_rdcsr)(sc, LE_CSR0));
  632         if_printf(ifp, "adr %08x, flags/blen %08x\n", LE_LE32TOH(rmd.rmd0),
  633             LE_LE32TOH(rmd.rmd1));
  634         if (len - ETHER_CRC_LEN >= sizeof(eh)) {
  635                 (*sc->sc_copyfrombuf)(sc, &eh, LE_RBUFADDR(sc, no), sizeof(eh));
  636                 if_printf(ifp, "dst %s", ether_sprintf(eh.ether_dhost));
  637                 printf(" src %s type %04x\n", ether_sprintf(eh.ether_shost),
  638                     ntohs(eh.ether_type));
  639         }
  640 }
  641 
  642 static void
  643 am79900_xmit_print(struct lance_softc *sc, int no)
  644 {
  645         struct ifnet *ifp = sc->sc_ifp;
  646         struct ether_header eh;
  647         struct letmd tmd;
  648         uint16_t len;
  649 
  650         (*sc->sc_copyfromdesc)(sc, &tmd, LE_TMDADDR(sc, no), sizeof(tmd));
  651         len = -(LE_LE32TOH(tmd.tmd1) & 0xfff);
  652         if_printf(ifp, "transmit buffer %d, len = %d\n", no, len);
  653         if_printf(ifp, "status %04x\n", (*sc->sc_rdcsr)(sc, LE_CSR0));
  654         if_printf(ifp, "adr %08x, flags/blen %08x\n", LE_LE32TOH(tmd.tmd0),
  655             LE_LE32TOH(tmd.tmd1));
  656         if (len >= sizeof(eh)) {
  657                 (*sc->sc_copyfrombuf)(sc, &eh, LE_TBUFADDR(sc, no), sizeof(eh));
  658                 if_printf(ifp, "dst %s", ether_sprintf(eh.ether_dhost));
  659                 printf(" src %s type %04x\n", ether_sprintf(eh.ether_shost),
  660                     ntohs(eh.ether_type));
  661         }
  662 }
  663 #endif /* LEDEBUG */

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