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Annotation of Net2/arch/vax/if/if_ec.c, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 1982, 1986 Regents of the University of California.
        !             3:  * All rights reserved.
        !             4:  *
        !             5:  * Redistribution and use in source and binary forms, with or without
        !             6:  * modification, are permitted provided that the following conditions
        !             7:  * are met:
        !             8:  * 1. Redistributions of source code must retain the above copyright
        !             9:  *    notice, this list of conditions and the following disclaimer.
        !            10:  * 2. Redistributions in binary form must reproduce the above copyright
        !            11:  *    notice, this list of conditions and the following disclaimer in the
        !            12:  *    documentation and/or other materials provided with the distribution.
        !            13:  * 3. All advertising materials mentioning features or use of this software
        !            14:  *    must display the following acknowledgement:
        !            15:  *     This product includes software developed by the University of
        !            16:  *     California, Berkeley and its contributors.
        !            17:  * 4. Neither the name of the University nor the names of its contributors
        !            18:  *    may be used to endorse or promote products derived from this software
        !            19:  *    without specific prior written permission.
        !            20:  *
        !            21:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
        !            22:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
        !            23:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
        !            24:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
        !            25:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
        !            26:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
        !            27:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
        !            28:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
        !            29:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
        !            30:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
        !            31:  * SUCH DAMAGE.
        !            32:  *
        !            33:  *     @(#)if_ec.c     7.8 (Berkeley) 12/16/90
        !            34:  */
        !            35: 
        !            36: #include "ec.h"
        !            37: #if NEC > 0
        !            38: 
        !            39: /*
        !            40:  * 3Com Ethernet Controller interface
        !            41:  */
        !            42: #include "../include/pte.h"
        !            43: 
        !            44: #include "sys/param.h"
        !            45: #include "sys/systm.h"
        !            46: #include "sys/mbuf.h"
        !            47: #include "sys/buf.h"
        !            48: #include "sys/protosw.h"
        !            49: #include "sys/socket.h"
        !            50: #include "sys/syslog.h"
        !            51: #include "sys/vmmac.h"
        !            52: #include "sys/ioctl.h"
        !            53: #include "sys/errno.h"
        !            54: 
        !            55: #include "net/if.h"
        !            56: #include "net/netisr.h"
        !            57: #include "net/route.h"
        !            58: 
        !            59: #ifdef INET
        !            60: #include "netinet/in.h"
        !            61: #include "netinet/in_systm.h"
        !            62: #include "netinet/in_var.h"
        !            63: #include "netinet/ip.h"
        !            64: #include "netinet/if_ether.h"
        !            65: #endif
        !            66: 
        !            67: #ifdef NS
        !            68: #include "netns/ns.h"
        !            69: #include "netns/ns_if.h"
        !            70: #endif
        !            71: 
        !            72: #include "../include/cpu.h"
        !            73: #include "../include/mtpr.h"
        !            74: #include "if_ecreg.h"
        !            75: #include "if_uba.h"
        !            76: #include "../uba/ubareg.h"
        !            77: #include "../uba/ubavar.h"
        !            78: 
        !            79: #if CLSIZE == 2
        !            80: #define ECBUFSIZE      32              /* on-board memory, clusters */
        !            81: #endif
        !            82: 
        !            83: int    ecubamem(), ecprobe(), ecattach(), ecrint(), ecxint(), eccollide();
        !            84: struct uba_device *ecinfo[NEC];
        !            85: u_short ecstd[] = { 0 };
        !            86: struct uba_driver ecdriver =
        !            87:        { ecprobe, 0, ecattach, 0, ecstd, "ec", ecinfo, 0, 0, 0, 0, ecubamem };
        !            88: 
        !            89: int    ecinit(),ecioctl(),ecstart(),ecreset(),ether_output();
        !            90: struct mbuf *ecget();
        !            91: 
        !            92: extern struct ifnet loif;
        !            93: 
        !            94: /*
        !            95:  * Ethernet software status per interface.
        !            96:  *
        !            97:  * Each interface is referenced by a network interface structure,
        !            98:  * es_if, which the routing code uses to locate the interface.
        !            99:  * This structure contains the output queue for the interface, its address, ...
        !           100:  * We also have, for each interface, a UBA interface structure, which
        !           101:  * contains information about the UNIBUS resources held by the interface:
        !           102:  * map registers, buffered data paths, etc.  Information is cached in this
        !           103:  * structure for use by the if_uba.c routines in running the interface
        !           104:  * efficiently.
        !           105:  */
        !           106: struct ec_softc {
        !           107:        struct  arpcom es_ac;           /* common Ethernet structures */
        !           108: #define        es_if   es_ac.ac_if             /* network-visible interface */
        !           109: #define        es_addr es_ac.ac_enaddr         /* hardware Ethernet address */
        !           110:        struct  ifuba es_ifuba;         /* UNIBUS resources */
        !           111:        short   es_mask;                /* mask for current output delay */
        !           112:        u_char  *es_buf[16];            /* virtual addresses of buffers */
        !           113: } ec_softc[NEC];
        !           114: 
        !           115: /*
        !           116:  * Configure on-board memory for an interface.
        !           117:  * Called from autoconfig and after a uba reset.
        !           118:  * The address of the memory on the uba is supplied in the device flags.
        !           119:  */
        !           120: ecubamem(ui, uban)
        !           121:        register struct uba_device *ui;
        !           122: {
        !           123:        register caddr_t ecbuf = (caddr_t) &umem[uban][ui->ui_flags];
        !           124:        register struct ecdevice *addr = (struct ecdevice *)ui->ui_addr;
        !           125: 
        !           126:        /*
        !           127:         * Make sure csr is there (we run before ecprobe).
        !           128:         */
        !           129:        if (badaddr((caddr_t)addr, 2))
        !           130:                return (-1);
        !           131: #if VAX780
        !           132:        if (cpu == VAX_780 && uba_hd[uban].uh_uba->uba_sr) {
        !           133:                uba_hd[uban].uh_uba->uba_sr = uba_hd[uban].uh_uba->uba_sr;
        !           134:                return (-1);
        !           135:        }
        !           136: #endif
        !           137:        /*
        !           138:         * Make sure memory is turned on
        !           139:         */
        !           140:        addr->ec_rcr = EC_AROM;
        !           141:        /*
        !           142:         * Tell the system that the board has memory here, so it won't
        !           143:         * attempt to allocate the addresses later.
        !           144:         */
        !           145:        if (ubamem(uban, ui->ui_flags, ECBUFSIZE*CLSIZE, 1) == 0) {
        !           146:                printf("ec%d: cannot reserve uba addresses\n", ui->ui_unit);
        !           147:                addr->ec_rcr = EC_MDISAB;       /* disable memory */
        !           148:                return (-1);
        !           149:        }
        !           150:        /*
        !           151:         * Check for existence of buffers on Unibus.
        !           152:         */
        !           153:        if (badaddr((caddr_t)ecbuf, 2)) {
        !           154: bad:
        !           155:                printf("ec%d: buffer mem not found\n", ui->ui_unit);
        !           156:                (void) ubamem(uban, ui->ui_flags, ECBUFSIZE*2, 0);
        !           157:                addr->ec_rcr = EC_MDISAB;       /* disable memory */
        !           158:                return (-1);
        !           159:        }
        !           160: #if VAX780
        !           161:        if (cpu == VAX_780 && uba_hd[uban].uh_uba->uba_sr) {
        !           162:                uba_hd[uban].uh_uba->uba_sr = uba_hd[uban].uh_uba->uba_sr;
        !           163:                goto bad;
        !           164:        }
        !           165: #endif
        !           166:        if (ui->ui_alive == 0)          /* Only printf from autoconfig */
        !           167:                printf("ec%d: mem %x-%x\n", ui->ui_unit,
        !           168:                        ui->ui_flags, ui->ui_flags + ECBUFSIZE*CLBYTES - 1);
        !           169:        ui->ui_type = 1;                /* Memory on, allocated */
        !           170:        return (0);
        !           171: }
        !           172: 
        !           173: /*
        !           174:  * Do output DMA to determine interface presence and
        !           175:  * interrupt vector.  DMA is too short to disturb other hosts.
        !           176:  */
        !           177: ecprobe(reg, ui)
        !           178:        caddr_t reg;
        !           179:        struct uba_device *ui;
        !           180: {
        !           181:        register int br, cvec;          /* r11, r10 value-result */
        !           182:        register struct ecdevice *addr = (struct ecdevice *)reg;
        !           183:        register caddr_t ecbuf = (caddr_t) &umem[ui->ui_ubanum][ui->ui_flags];
        !           184: 
        !           185: #ifdef lint
        !           186:        br = 0; cvec = br; br = cvec;
        !           187:        ecrint(0); ecxint(0); eccollide(0);
        !           188: #endif
        !           189: 
        !           190:        /*
        !           191:         * Check that buffer memory was found and enabled.
        !           192:         */
        !           193:        if (ui->ui_type == 0)
        !           194:                return(0);
        !           195:        /*
        !           196:         * Make a one byte packet in what should be buffer #0.
        !           197:         * Submit it for sending.  This should cause an xmit interrupt.
        !           198:         * The xmit interrupt vector is 8 bytes after the receive vector,
        !           199:         * so adjust for this before returning.
        !           200:         */
        !           201:        *(u_short *)ecbuf = (u_short) 03777;
        !           202:        ecbuf[03777] = '\0';
        !           203:        addr->ec_xcr = EC_XINTEN|EC_XWBN;
        !           204:        DELAY(100000);
        !           205:        addr->ec_xcr = EC_XCLR;
        !           206:        if (cvec > 0 && cvec != 0x200) {
        !           207:                if (cvec & 04) {        /* collision interrupt */
        !           208:                        cvec -= 04;
        !           209:                        br += 1;                /* rcv is collision + 1 */
        !           210:                } else {                /* xmit interrupt */
        !           211:                        cvec -= 010;
        !           212:                        br += 2;                /* rcv is xmit + 2 */
        !           213:                }
        !           214:        }
        !           215:        return (1);
        !           216: }
        !           217: 
        !           218: /*
        !           219:  * Interface exists: make available by filling in network interface
        !           220:  * record.  System will initialize the interface when it is ready
        !           221:  * to accept packets.
        !           222:  */
        !           223: ecattach(ui)
        !           224:        struct uba_device *ui;
        !           225: {
        !           226:        struct ec_softc *es = &ec_softc[ui->ui_unit];
        !           227:        register struct ifnet *ifp = &es->es_if;
        !           228:        register struct ecdevice *addr = (struct ecdevice *)ui->ui_addr;
        !           229:        int i, j;
        !           230:        u_char *cp;
        !           231: 
        !           232:        ifp->if_unit = ui->ui_unit;
        !           233:        ifp->if_name = "ec";
        !           234:        ifp->if_mtu = ETHERMTU;
        !           235: 
        !           236:        /*
        !           237:         * Read the ethernet address off the board, one nibble at a time.
        !           238:         */
        !           239:        addr->ec_xcr = EC_UECLR; /* zero address pointer */
        !           240:        addr->ec_rcr = EC_AROM;
        !           241:        cp = es->es_addr;
        !           242: #define        NEXTBIT addr->ec_rcr = EC_AROM|EC_ASTEP; addr->ec_rcr = EC_AROM
        !           243:        for (i=0; i < sizeof (es->es_addr); i++) {
        !           244:                *cp = 0;
        !           245:                for (j=0; j<=4; j+=4) {
        !           246:                        *cp |= ((addr->ec_rcr >> 8) & 0xf) << j;
        !           247:                        NEXTBIT; NEXTBIT; NEXTBIT; NEXTBIT;
        !           248:                }
        !           249:                cp++;
        !           250:        }
        !           251:        printf("ec%d: hardware address %s\n", ui->ui_unit,
        !           252:                ether_sprintf(es->es_addr));
        !           253:        ifp->if_init = ecinit;
        !           254:        ifp->if_ioctl = ecioctl;
        !           255:        ifp->if_output = ether_output;
        !           256:        ifp->if_start = ecstart;
        !           257:        ifp->if_reset = ecreset;
        !           258:        ifp->if_flags = IFF_BROADCAST | IFF_SIMPLEX;
        !           259:        for (i=0; i<16; i++)
        !           260:                es->es_buf[i] 
        !           261:                    = (u_char *)&umem[ui->ui_ubanum][ui->ui_flags + 2048*i];
        !           262:        if_attach(ifp);
        !           263: }
        !           264: 
        !           265: /*
        !           266:  * Reset of interface after UNIBUS reset.
        !           267:  * If interface is on specified uba, reset its state.
        !           268:  */
        !           269: ecreset(unit, uban)
        !           270:        int unit, uban;
        !           271: {
        !           272:        register struct uba_device *ui;
        !           273: 
        !           274:        if (unit >= NEC || (ui = ecinfo[unit]) == 0 || ui->ui_alive == 0 ||
        !           275:            ui->ui_ubanum != uban)
        !           276:                return;
        !           277:        printf(" ec%d", unit);
        !           278:        ec_softc[unit].es_if.if_flags &= ~IFF_RUNNING;
        !           279:        ecinit(unit);
        !           280: }
        !           281: 
        !           282: /*
        !           283:  * Initialization of interface; clear recorded pending
        !           284:  * operations, and reinitialize UNIBUS usage.
        !           285:  */
        !           286: ecinit(unit)
        !           287:        int unit;
        !           288: {
        !           289:        struct ec_softc *es = &ec_softc[unit];
        !           290:        struct ecdevice *addr;
        !           291:        register struct ifnet *ifp = &es->es_if;
        !           292:        int i, s;
        !           293: 
        !           294:        /* not yet, if address still unknown */
        !           295:        if (ifp->if_addrlist == (struct ifaddr *)0)
        !           296:                return;
        !           297: 
        !           298:        /*
        !           299:         * Hang receive buffers and start any pending writes.
        !           300:         * Writing into the rcr also makes sure the memory
        !           301:         * is turned on.
        !           302:         */
        !           303:        if ((ifp->if_flags & IFF_RUNNING) == 0) {
        !           304:                u_short start_read;
        !           305:                addr = (struct ecdevice *)ecinfo[unit]->ui_addr;
        !           306:                s = splimp();
        !           307:                /*
        !           308:                 * write our ethernet address into the address recognition ROM 
        !           309:                 * so we can always use the same EC_READ bits (referencing ROM),
        !           310:                 * in case we change the address sometime.
        !           311:                 * Note that this is safe here as the receiver is NOT armed.
        !           312:                 */
        !           313:                ec_setaddr(es->es_addr, unit);
        !           314:                /*
        !           315:                 * Arm the receiver
        !           316: #ifdef MULTI
        !           317:                if (es->es_if.if_flags & IFF_PROMISC)
        !           318:                        start_read = EC_PROMISC;
        !           319:                else if (es->es_if.if_flags & IFF_MULTI)
        !           320:                        start_read = EC_MULTI;
        !           321:                else
        !           322: #endif MULTI
        !           323:                        start_read = EC_READ;
        !           324:                 */
        !           325:                for (i = ECRHBF; i >= ECRLBF; i--)
        !           326:                        addr->ec_rcr = EC_READ | i;
        !           327:                es->es_if.if_flags &= ~IFF_OACTIVE;
        !           328:                es->es_mask = ~0;
        !           329:                es->es_if.if_flags |= IFF_RUNNING;
        !           330:                if (es->es_if.if_snd.ifq_head)
        !           331:                        (void) ecstart(&es->es_if);
        !           332:                splx(s);
        !           333:        }
        !           334: }
        !           335: 
        !           336: /*
        !           337:  * Start output on interface.  Get another datagram to send
        !           338:  * off of the interface queue, and copy it to the interface
        !           339:  * before starting the output.
        !           340:  */
        !           341: ecstart(ifp)
        !           342: struct ifnet *ifp;
        !           343: {
        !           344:        int unit = ifp->if_unit;
        !           345:        register struct ec_softc *es = &ec_softc[unit];
        !           346:        struct ecdevice *addr;
        !           347:        struct mbuf *m;
        !           348: 
        !           349:        if ((es->es_if.if_flags & IFF_RUNNING) == 0)
        !           350:                return (0);
        !           351:        IF_DEQUEUE(&es->es_if.if_snd, m);
        !           352:        if (m == 0)
        !           353:                return (0);
        !           354:        ecput(es->es_buf[ECTBF], m);
        !           355:        addr = (struct ecdevice *)ecinfo[unit]->ui_addr;
        !           356:        addr->ec_xcr = EC_WRITE|ECTBF;
        !           357:        es->es_if.if_flags |= IFF_OACTIVE;
        !           358:        return (0);
        !           359: }
        !           360: 
        !           361: /*
        !           362:  * Ethernet interface transmitter interrupt.
        !           363:  * Start another output if more data to send.
        !           364:  */
        !           365: ecxint(unit)
        !           366:        int unit;
        !           367: {
        !           368:        register struct ec_softc *es = &ec_softc[unit];
        !           369:        register struct ecdevice *addr =
        !           370:                (struct ecdevice *)ecinfo[unit]->ui_addr;
        !           371: 
        !           372:        if ((es->es_if.if_flags & IFF_OACTIVE) == 0)
        !           373:                return;
        !           374:        if ((addr->ec_xcr&EC_XDONE) == 0 || (addr->ec_xcr&EC_XBN) != ECTBF) {
        !           375:                printf("ec%d: stray xmit interrupt, xcr=%b\n", unit,
        !           376:                        addr->ec_xcr, EC_XBITS);
        !           377:                es->es_if.if_flags &= ~IFF_OACTIVE;
        !           378:                addr->ec_xcr = EC_XCLR;
        !           379:                return;
        !           380:        }
        !           381:        es->es_if.if_opackets++;
        !           382:        es->es_if.if_flags &= ~IFF_OACTIVE;
        !           383:        es->es_mask = ~0;
        !           384:        addr->ec_xcr = EC_XCLR;
        !           385:        if (es->es_if.if_snd.ifq_head)
        !           386:                (void) ecstart(&es->es_if);
        !           387: }
        !           388: 
        !           389: /*
        !           390:  * Collision on ethernet interface.  Do exponential
        !           391:  * backoff, and retransmit.  If have backed off all
        !           392:  * the way print warning diagnostic, and drop packet.
        !           393:  */
        !           394: eccollide(unit)
        !           395:        int unit;
        !           396: {
        !           397:        register struct ec_softc *es = &ec_softc[unit];
        !           398:        register struct ecdevice *addr =
        !           399:            (struct ecdevice *)ecinfo[unit]->ui_addr;
        !           400:        register i;
        !           401:        int delay;
        !           402: 
        !           403:        es->es_if.if_collisions++;
        !           404:        if ((es->es_if.if_flags & IFF_OACTIVE) == 0)
        !           405:                return;
        !           406: 
        !           407:        /*
        !           408:         * Es_mask is a 16 bit number with n low zero bits, with
        !           409:         * n the number of backoffs.  When es_mask is 0 we have
        !           410:         * backed off 16 times, and give up.
        !           411:         */
        !           412:        if (es->es_mask == 0) {
        !           413:                u_short start_read;
        !           414:                es->es_if.if_oerrors++;
        !           415:                log(LOG_ERR, "ec%d: send error\n", unit);
        !           416:                /*
        !           417:                 * Reset interface, then requeue rcv buffers.
        !           418:                 * Some incoming packets may be lost, but that
        !           419:                 * can't be helped.
        !           420:                 */
        !           421:                addr->ec_xcr = EC_UECLR;
        !           422: #ifdef MULTI
        !           423:                if (es->es_if.if_flags & IFF_PROMISC)
        !           424:                        start_read = EC_PROMISC;
        !           425:                else if (es->es_if.if_flags & IFF_MULTI)
        !           426:                        start_read = EC_MULTI;
        !           427:                else
        !           428: #endif MULTI
        !           429:                        start_read = EC_READ;
        !           430:                for (i=ECRHBF; i>=ECRLBF; i--)
        !           431:                        addr->ec_rcr = start_read|i;
        !           432:                /*
        !           433:                 * Reset and transmit next packet (if any).
        !           434:                 */
        !           435:                es->es_if.if_flags &= ~IFF_OACTIVE;
        !           436:                es->es_mask = ~0;
        !           437:                if (es->es_if.if_snd.ifq_head)
        !           438:                        (void) ecstart(&es->es_if);
        !           439:                return;
        !           440:        }
        !           441:        /*
        !           442:         * Do exponential backoff.  Compute delay based on low bits
        !           443:         * of the interval timer (1 bit for each transmission attempt,
        !           444:         * but at most 5 bits).  Then delay for that number of
        !           445:         * slot times.  A slot time is 51.2 microseconds (rounded to 51).
        !           446:         * This does not take into account the time already used to
        !           447:         * process the interrupt.
        !           448:         */
        !           449:        es->es_mask <<= 1;
        !           450:        delay = mfpr(ICR) & 0x1f &~ es->es_mask;
        !           451:        DELAY(delay * 51);
        !           452:        /*
        !           453:         * Clear the controller's collision flag, thus enabling retransmit.
        !           454:         */
        !           455:        addr->ec_xcr = EC_CLEAR;
        !           456: }
        !           457: 
        !           458: /*
        !           459:  * Ethernet interface receiver interrupt.
        !           460:  * If input error just drop packet.
        !           461:  * Otherwise examine 
        !           462:  * packet to determine type.  If can't determine length
        !           463:  * from type, then have to drop packet.  Othewise decapsulate
        !           464:  * packet based on type and pass to type specific higher-level
        !           465:  * input routine.
        !           466:  */
        !           467: ecrint(unit)
        !           468:        int unit;
        !           469: {
        !           470:        struct ecdevice *addr = (struct ecdevice *)ecinfo[unit]->ui_addr;
        !           471: 
        !           472:        while (addr->ec_rcr & EC_RDONE)
        !           473:                ecread(unit);
        !           474: }
        !           475: 
        !           476: ecread(unit)
        !           477:        int unit;
        !           478: {
        !           479:        register struct ec_softc *es = &ec_softc[unit];
        !           480:        struct ecdevice *addr = (struct ecdevice *)ecinfo[unit]->ui_addr;
        !           481:        register struct ether_header *ec;
        !           482:        struct mbuf *m;
        !           483:        int len, off, resid, ecoff, rbuf;
        !           484:        register struct ifqueue *inq;
        !           485:        u_short start_read;
        !           486:        u_char *ecbuf;
        !           487: 
        !           488:        es->es_if.if_ipackets++;
        !           489:        rbuf = addr->ec_rcr & EC_RBN;
        !           490:        if (rbuf < ECRLBF || rbuf > ECRHBF)
        !           491:                panic("ecrint");
        !           492:        ecbuf = es->es_buf[rbuf];
        !           493:        ecoff = *(short *)ecbuf;
        !           494:        if (ecoff <= ECRDOFF || ecoff > 2046) {
        !           495:                es->es_if.if_ierrors++;
        !           496: #ifdef notdef
        !           497:                if (es->es_if.if_ierrors % 100 == 0)
        !           498:                        printf("ec%d: += 100 input errors\n", unit);
        !           499: #endif
        !           500:                goto setup;
        !           501:        }
        !           502: 
        !           503:        /*
        !           504:         * Get input data length.
        !           505:         * Get pointer to ethernet header (in input buffer).
        !           506:         * Deal with trailer protocol: if type is trailer type
        !           507:         * get true type from first 16-bit word past data.
        !           508:         * Remember that type was trailer by setting off.
        !           509:         */
        !           510:        len = ecoff - ECRDOFF - sizeof (struct ether_header);
        !           511:        ec = (struct ether_header *)(ecbuf + ECRDOFF);
        !           512:        ec->ether_type = ntohs((u_short)ec->ether_type);
        !           513: #define        ecdataaddr(ec, off, type)       ((type)(((caddr_t)((ec)+1)+(off))))
        !           514:        if (ec->ether_type >= ETHERTYPE_TRAIL &&
        !           515:            ec->ether_type < ETHERTYPE_TRAIL+ETHERTYPE_NTRAILER) {
        !           516:                off = (ec->ether_type - ETHERTYPE_TRAIL) * 512;
        !           517:                if (off >= ETHERMTU)
        !           518:                        goto setup;             /* sanity */
        !           519:                ec->ether_type = ntohs(*ecdataaddr(ec, off, u_short *));
        !           520:                resid = ntohs(*(ecdataaddr(ec, off+2, u_short *)));
        !           521:                if (off + resid > len)
        !           522:                        goto setup;             /* sanity */
        !           523:                len = off + resid;
        !           524:        } else
        !           525:                off = 0;
        !           526:        if (len == 0)
        !           527:                goto setup;
        !           528: 
        !           529:        /*
        !           530:         * Pull packet off interface.  Off is nonzero if packet
        !           531:         * has trailing header; ecget will then force this header
        !           532:         * information to be at the front, but we still have to drop
        !           533:         * the type and length which are at the front of any trailer data.
        !           534:         */
        !           535:        m = ecget(ecbuf, len, off, &es->es_if);
        !           536:        if (m)
        !           537:                ether_input(&es->es_if, ec, m);
        !           538:        /*
        !           539:         * Reset for next packet.
        !           540:         */
        !           541: setup:
        !           542: #ifdef MULTI
        !           543:                if (es->es_if.if_flags & IFF_PROMISC)
        !           544:                        start_read = EC_PROMISC;
        !           545:                else if (es->es_if.if_flags & IFF_MULTI)
        !           546:                        start_read = EC_MULTI;
        !           547:                else
        !           548: #endif MULTI
        !           549:                        start_read = EC_READ;
        !           550:        addr->ec_rcr = start_read|EC_RCLR|rbuf;
        !           551: }
        !           552: 
        !           553: /*
        !           554:  * Routine to copy from mbuf chain to transmit
        !           555:  * buffer in UNIBUS memory.
        !           556:  * If packet size is less than the minimum legal size,
        !           557:  * the buffer is expanded.  We probably should zero out the extra
        !           558:  * bytes for security, but that would slow things down.
        !           559:  */
        !           560: ecput(ecbuf, m)
        !           561:        u_char *ecbuf;
        !           562:        struct mbuf *m;
        !           563: {
        !           564:        register struct mbuf *mp;
        !           565:        register int off;
        !           566:        u_char *bp;
        !           567: 
        !           568:        for (off = 2048, mp = m; mp; mp = mp->m_next)
        !           569:                off -= mp->m_len;
        !           570:        if (2048 - off < ETHERMIN + sizeof (struct ether_header))
        !           571:                off = 2048 - ETHERMIN - sizeof (struct ether_header);
        !           572:        *(u_short *)ecbuf = off;
        !           573:        bp = (u_char *)(ecbuf + off);
        !           574:        for (mp = m; mp; mp = mp->m_next) {
        !           575:                register unsigned len = mp->m_len;
        !           576:                u_char *mcp;
        !           577: 
        !           578:                if (len == 0)
        !           579:                        continue;
        !           580:                mcp = mtod(mp, u_char *);
        !           581:                if ((unsigned)bp & 01) {
        !           582:                        *bp++ = *mcp++;
        !           583:                        len--;
        !           584:                }
        !           585:                if (off = (len >> 1)) {
        !           586:                        register u_short *to, *from;
        !           587: 
        !           588:                        to = (u_short *)bp;
        !           589:                        from = (u_short *)mcp;
        !           590:                        do
        !           591:                                *to++ = *from++;
        !           592:                        while (--off > 0);
        !           593:                        bp = (u_char *)to,
        !           594:                        mcp = (u_char *)from;
        !           595:                }
        !           596:                if (len & 01)
        !           597:                        *bp++ = *mcp++;
        !           598:        }
        !           599:        m_freem(m);
        !           600: }
        !           601: 
        !           602: /*
        !           603:  * Routine to copy from UNIBUS memory into mbufs.
        !           604:  * Similar in spirit to if_rubaget.
        !           605:  *
        !           606:  * Warning: This makes the fairly safe assumption that
        !           607:  * mbufs have even lengths.
        !           608:  */
        !           609: struct mbuf *
        !           610: ecget(ecbuf, totlen, off0, ifp)
        !           611:        u_char *ecbuf;
        !           612:        int totlen, off0;
        !           613:        struct ifnet *ifp;
        !           614: {
        !           615:        register struct mbuf *m;
        !           616:        struct mbuf *top = 0, **mp = &top;
        !           617:        register int off = off0, len;
        !           618:        u_char *cp = (ecbuf += ECRDOFF + sizeof (struct ether_header));
        !           619:        u_char *packet_end = cp + totlen;
        !           620: 
        !           621:        if (off) {
        !           622:                off += 2 * sizeof(u_short);
        !           623:                totlen -= 2 *sizeof(u_short);
        !           624:                cp += off;
        !           625:        }
        !           626: 
        !           627:        MGETHDR(m, M_DONTWAIT, MT_DATA);
        !           628:        if (m == 0)
        !           629:                return (0);
        !           630:        m->m_pkthdr.rcvif = ifp;
        !           631:        m->m_pkthdr.len = totlen;
        !           632:        m->m_len = MHLEN;
        !           633: 
        !           634:        while (totlen > 0) {
        !           635:                register int words;
        !           636:                u_char *mcp;
        !           637: 
        !           638:                if (top) {
        !           639:                        MGET(m, M_DONTWAIT, MT_DATA);
        !           640:                        if (m == 0) {
        !           641:                                m_freem(top);
        !           642:                                return (0);
        !           643:                        }
        !           644:                        m->m_len = MLEN;
        !           645:                }
        !           646:                len = min(totlen, (packet_end - cp));
        !           647:                if (len >= MINCLSIZE) {
        !           648:                        MCLGET(m, M_DONTWAIT);
        !           649:                        if (m->m_flags & M_EXT)
        !           650:                                m->m_len = len = min(len, MCLBYTES);
        !           651:                        else
        !           652:                                len = m->m_len;
        !           653:                } else {
        !           654:                        /*
        !           655:                         * Place initial small packet/header at end of mbuf.
        !           656:                         */
        !           657:                        if (len < m->m_len) {
        !           658:                                if (top == 0 && len + max_linkhdr <= m->m_len)
        !           659:                                        m->m_data += max_linkhdr;
        !           660:                                m->m_len = len;
        !           661:                        } else
        !           662:                                len = m->m_len;
        !           663:                }
        !           664:                mcp = mtod(m, u_char *);
        !           665:                if (words = (len >> 1)) {
        !           666:                        register u_short *to, *from;
        !           667: 
        !           668:                        to = (u_short *)mcp;
        !           669:                        from = (u_short *)cp;
        !           670:                        do
        !           671:                                *to++ = *from++;
        !           672:                        while (--words > 0);
        !           673:                        mcp = (u_char *)to;
        !           674:                        cp = (u_char *)from;
        !           675:                }
        !           676:                if (len & 01)
        !           677:                        *mcp++ = *cp++;
        !           678:                *mp = m;
        !           679:                mp = &m->m_next;
        !           680:                totlen -= len;
        !           681:                if (cp == packet_end)
        !           682:                        cp = ecbuf;
        !           683:        }
        !           684:        return (top);
        !           685: bad:
        !           686:        m_freem(top);
        !           687:        return (0);
        !           688: }
        !           689: 
        !           690: /*
        !           691:  * Process an ioctl request.
        !           692:  */
        !           693: ecioctl(ifp, cmd, data)
        !           694:        register struct ifnet *ifp;
        !           695:        int cmd;
        !           696:        caddr_t data;
        !           697: {
        !           698:        register struct ifaddr *ifa = (struct ifaddr *)data;
        !           699:        struct ec_softc *es = &ec_softc[ifp->if_unit];
        !           700:        struct ecdevice *addr;
        !           701:        int s = splimp(), error = 0;
        !           702: 
        !           703:        addr = (struct ecdevice *)(ecinfo[ifp->if_unit]->ui_addr);
        !           704: 
        !           705:        switch (cmd) {
        !           706: 
        !           707:        case SIOCSIFADDR:
        !           708:                ifp->if_flags |= IFF_UP;
        !           709: 
        !           710:                switch (ifa->ifa_addr->sa_family) {
        !           711: #ifdef INET
        !           712:                case AF_INET:
        !           713:                        ecinit(ifp->if_unit);   /* before arpwhohas */
        !           714:                        ((struct arpcom *)ifp)->ac_ipaddr =
        !           715:                                IA_SIN(ifa)->sin_addr;
        !           716:                        arpwhohas((struct arpcom *)ifp, &IA_SIN(ifa)->sin_addr);
        !           717:                        break;
        !           718: #endif
        !           719: #ifdef NS
        !           720:                case AF_NS:
        !           721:                    {
        !           722:                        register struct ns_addr *ina = &(IA_SNS(ifa)->sns_addr);
        !           723: 
        !           724:                        if (ns_nullhost(*ina))
        !           725:                                ina->x_host = *(union ns_host *)(es->es_addr);
        !           726:                        else {
        !           727:                                /* 
        !           728:                                 * The manual says we can't change the address 
        !           729:                                 * while the receiver is armed,
        !           730:                                 * so reset everything
        !           731:                                 */
        !           732:                                ifp->if_flags &= ~IFF_RUNNING; 
        !           733:                                bcopy((caddr_t)ina->x_host.c_host,
        !           734:                                    (caddr_t)es->es_addr, sizeof(es->es_addr));
        !           735:                        }
        !           736:                        ecinit(ifp->if_unit); /* does ec_setaddr() */
        !           737:                        break;
        !           738:                    }
        !           739: #endif
        !           740:                default:
        !           741:                        ecinit(ifp->if_unit);
        !           742:                        break;
        !           743:                }
        !           744:                break;
        !           745: 
        !           746:        case SIOCSIFFLAGS:
        !           747:                if ((ifp->if_flags & IFF_UP) == 0 &&
        !           748:                    ifp->if_flags & IFF_RUNNING) {
        !           749:                        addr->ec_xcr = EC_UECLR;
        !           750:                        ifp->if_flags &= ~IFF_RUNNING;
        !           751:                } else if (ifp->if_flags & IFF_UP &&
        !           752:                    (ifp->if_flags & IFF_RUNNING) == 0)
        !           753:                        ecinit(ifp->if_unit);
        !           754:                break;
        !           755: 
        !           756:        default:
        !           757:                error = EINVAL;
        !           758:        }
        !           759:        splx(s);
        !           760:        return (error);
        !           761: }
        !           762: 
        !           763: ec_setaddr(physaddr,unit)
        !           764:        u_char *physaddr;
        !           765:        int unit;
        !           766: {
        !           767:        struct ec_softc *es = &ec_softc[unit];
        !           768:        struct uba_device *ui = ecinfo[unit];
        !           769:        register struct ecdevice *addr = (struct ecdevice *)ui->ui_addr;
        !           770:        register char nibble;
        !           771:        register int i, j;
        !           772: 
        !           773:        /*
        !           774:         * Use the ethernet address supplied
        !           775:         * Note that we do a UECLR here, so the receive buffers
        !           776:         * must be requeued.
        !           777:         */
        !           778:        
        !           779: #ifdef DEBUG
        !           780:        printf("ec_setaddr: setting address for unit %d = %s",
        !           781:                unit, ether_sprintf(physaddr));
        !           782: #endif
        !           783:        addr->ec_xcr = EC_UECLR;
        !           784:        addr->ec_rcr = 0;
        !           785:        /* load requested address */
        !           786:        for (i = 0; i < 6; i++) { /* 6 bytes of address */
        !           787:            es->es_addr[i] = physaddr[i];
        !           788:            nibble = physaddr[i] & 0xf; /* lower nibble */
        !           789:            addr->ec_rcr = (nibble << 8);
        !           790:            addr->ec_rcr = (nibble << 8) + EC_AWCLK; /* latch nibble */
        !           791:            addr->ec_rcr = (nibble << 8);
        !           792:            for (j=0; j < 4; j++) {
        !           793:                addr->ec_rcr = 0;
        !           794:                addr->ec_rcr = EC_ASTEP; /* step counter */
        !           795:                addr->ec_rcr = 0;
        !           796:            }
        !           797:            nibble = (physaddr[i] >> 4) & 0xf; /* upper nibble */
        !           798:            addr->ec_rcr = (nibble << 8);
        !           799:            addr->ec_rcr = (nibble << 8) + EC_AWCLK; /* latch nibble */
        !           800:            addr->ec_rcr = (nibble << 8);
        !           801:            for (j=0; j < 4; j++) {
        !           802:                addr->ec_rcr = 0;
        !           803:                addr->ec_rcr = EC_ASTEP; /* step counter */
        !           804:                addr->ec_rcr = 0;
        !           805:            }
        !           806:        }
        !           807: #ifdef DEBUG
        !           808:        /*
        !           809:         * Read the ethernet address off the board, one nibble at a time.
        !           810:         */
        !           811:        addr->ec_xcr = EC_UECLR;
        !           812:        addr->ec_rcr = 0; /* read RAM */
        !           813:        cp = es->es_addr;
        !           814: #undef NEXTBIT
        !           815: #define        NEXTBIT addr->ec_rcr = EC_ASTEP; addr->ec_rcr = 0
        !           816:        for (i=0; i < sizeof (es->es_addr); i++) {
        !           817:                *cp = 0;
        !           818:                for (j=0; j<=4; j+=4) {
        !           819:                        *cp |= ((addr->ec_rcr >> 8) & 0xf) << j;
        !           820:                        NEXTBIT; NEXTBIT; NEXTBIT; NEXTBIT;
        !           821:                }
        !           822:                cp++;
        !           823:        }
        !           824:        printf("ec_setaddr: RAM address for unit %d = %s",
        !           825:                unit, ether_sprintf(physaddr));
        !           826: #endif
        !           827: }
        !           828: #endif

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