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Annotation of 42BSD/sys/vaxif/if_en.c, revision 1.1

1.1     ! root        1: /*     if_en.c 6.1     83/07/29        */
        !             2: 
        !             3: #include "en.h"
        !             4: 
        !             5: /*
        !             6:  * Xerox prototype (3 Mb) Ethernet interface driver.
        !             7:  */
        !             8: #include "../machine/pte.h"
        !             9: 
        !            10: #include "../h/param.h"
        !            11: #include "../h/systm.h"
        !            12: #include "../h/mbuf.h"
        !            13: #include "../h/buf.h"
        !            14: #include "../h/protosw.h"
        !            15: #include "../h/socket.h"
        !            16: #include "../h/vmmac.h"
        !            17: #include "../h/errno.h"
        !            18: #include "../h/ioctl.h"
        !            19: 
        !            20: #include "../net/if.h"
        !            21: #include "../net/netisr.h"
        !            22: #include "../net/route.h"
        !            23: #include "../netinet/in.h"
        !            24: #include "../netinet/in_systm.h"
        !            25: #include "../netinet/ip.h"
        !            26: #include "../netinet/ip_var.h"
        !            27: #include "../netpup/pup.h"
        !            28: #include "../netpup/ether.h"
        !            29: 
        !            30: #include "../vax/cpu.h"
        !            31: #include "../vax/mtpr.h"
        !            32: #include "../vaxif/if_en.h"
        !            33: #include "../vaxif/if_enreg.h"
        !            34: #include "../vaxif/if_uba.h"
        !            35: #include "../vaxuba/ubareg.h"
        !            36: #include "../vaxuba/ubavar.h"
        !            37: 
        !            38: #define        ENMTU   (1024+512)
        !            39: #define        ENMRU   (1024+512+16)           /* 16 is enough to receive trailer */
        !            40: 
        !            41: int    enprobe(), enattach(), enrint(), enxint(), encollide();
        !            42: struct uba_device *eninfo[NEN];
        !            43: u_short enstd[] = { 0 };
        !            44: struct uba_driver endriver =
        !            45:        { enprobe, 0, enattach, 0, enstd, "en", eninfo };
        !            46: #define        ENUNIT(x)       minor(x)
        !            47: 
        !            48: int    eninit(),enoutput(),enreset(),enioctl();
        !            49: 
        !            50: #ifdef notdef
        !            51: /*
        !            52:  * If you need to byte swap IP's in the system, define
        !            53:  * this and do a SIOCSIFFLAGS at boot time.
        !            54:  */
        !            55: #define        ENF_SWABIPS     0x100
        !            56: #endif
        !            57: 
        !            58: /*
        !            59:  * Ethernet software status per interface.
        !            60:  *
        !            61:  * Each interface is referenced by a network interface structure,
        !            62:  * es_if, which the routing code uses to locate the interface.
        !            63:  * This structure contains the output queue for the interface, its address, ...
        !            64:  * We also have, for each interface, a UBA interface structure, which
        !            65:  * contains information about the UNIBUS resources held by the interface:
        !            66:  * map registers, buffered data paths, etc.  Information is cached in this
        !            67:  * structure for use by the if_uba.c routines in running the interface
        !            68:  * efficiently.
        !            69:  */
        !            70: struct en_softc {
        !            71:        struct  ifnet es_if;            /* network-visible interface */
        !            72:        struct  ifuba es_ifuba;         /* UNIBUS resources */
        !            73:        short   es_delay;               /* current output delay */
        !            74:        short   es_mask;                /* mask for current output delay */
        !            75:        short   es_lastx;               /* host last transmitted to */
        !            76:        short   es_oactive;             /* is output active? */
        !            77:        short   es_olen;                /* length of last output */
        !            78: } en_softc[NEN];
        !            79: 
        !            80: /*
        !            81:  * Do output DMA to determine interface presence and
        !            82:  * interrupt vector.  DMA is too short to disturb other hosts.
        !            83:  */
        !            84: enprobe(reg)
        !            85:        caddr_t reg;
        !            86: {
        !            87:        register int br, cvec;          /* r11, r10 value-result */
        !            88:        register struct endevice *addr = (struct endevice *)reg;
        !            89: 
        !            90: #ifdef lint
        !            91:        br = 0; cvec = br; br = cvec;
        !            92:        enrint(0); enxint(0); encollide(0);
        !            93: #endif
        !            94:        addr->en_istat = 0;
        !            95:        addr->en_owc = -1;
        !            96:        addr->en_oba = 0;
        !            97:        addr->en_ostat = EN_IEN|EN_GO;
        !            98:        DELAY(100000);
        !            99:        addr->en_ostat = 0;
        !           100:        return (1);
        !           101: }
        !           102: 
        !           103: /*
        !           104:  * Interface exists: make available by filling in network interface
        !           105:  * record.  System will initialize the interface when it is ready
        !           106:  * to accept packets.
        !           107:  */
        !           108: enattach(ui)
        !           109:        struct uba_device *ui;
        !           110: {
        !           111:        register struct en_softc *es = &en_softc[ui->ui_unit];
        !           112: 
        !           113:        es->es_if.if_unit = ui->ui_unit;
        !           114:        es->es_if.if_name = "en";
        !           115:        es->es_if.if_mtu = ENMTU;
        !           116:        es->es_if.if_init = eninit;
        !           117:        es->es_if.if_output = enoutput;
        !           118:        es->es_if.if_ioctl = enioctl;
        !           119:        es->es_if.if_reset = enreset;
        !           120:        es->es_ifuba.ifu_flags = UBA_NEEDBDP | UBA_NEED16 | UBA_CANTWAIT;
        !           121: #if defined(VAX750)
        !           122:        /* don't chew up 750 bdp's */
        !           123:        if (cpu == VAX_750 && ui->ui_unit > 0)
        !           124:                es->es_ifuba.ifu_flags &= ~UBA_NEEDBDP;
        !           125: #endif
        !           126:        if_attach(&es->es_if);
        !           127: }
        !           128: 
        !           129: /*
        !           130:  * Reset of interface after UNIBUS reset.
        !           131:  * If interface is on specified uba, reset its state.
        !           132:  */
        !           133: enreset(unit, uban)
        !           134:        int unit, uban;
        !           135: {
        !           136:        register struct uba_device *ui;
        !           137: 
        !           138:        if (unit >= NEN || (ui = eninfo[unit]) == 0 || ui->ui_alive == 0 ||
        !           139:            ui->ui_ubanum != uban)
        !           140:                return;
        !           141:        printf(" en%d", unit);
        !           142:        eninit(unit);
        !           143: }
        !           144: 
        !           145: /*
        !           146:  * Initialization of interface; clear recorded pending
        !           147:  * operations, and reinitialize UNIBUS usage.
        !           148:  */
        !           149: eninit(unit)
        !           150:        int unit;
        !           151: {
        !           152:        register struct en_softc *es = &en_softc[unit];
        !           153:        register struct uba_device *ui = eninfo[unit];
        !           154:        register struct endevice *addr;
        !           155:        struct sockaddr_in *sin = (struct sockaddr_in *)&es->es_if.if_addr;
        !           156:        int s;
        !           157: 
        !           158:        if (in_netof(sin->sin_addr) == 0)
        !           159:                return;
        !           160:        if (if_ubainit(&es->es_ifuba, ui->ui_ubanum,
        !           161:            sizeof (struct en_header), (int)btoc(ENMRU)) == 0) { 
        !           162:                printf("en%d: can't initialize\n", unit);
        !           163:                es->es_if.if_flags &= ~IFF_UP;
        !           164:                return;
        !           165:        }
        !           166:        addr = (struct endevice *)ui->ui_addr;
        !           167:        addr->en_istat = addr->en_ostat = 0;
        !           168: 
        !           169:        /*
        !           170:         * Hang a receive and start any
        !           171:         * pending writes by faking a transmit complete.
        !           172:         */
        !           173:        s = splimp();
        !           174:        addr->en_iba = es->es_ifuba.ifu_r.ifrw_info;
        !           175:        addr->en_iwc = -(sizeof (struct en_header) + ENMRU) >> 1;
        !           176:        addr->en_istat = EN_IEN|EN_GO;
        !           177:        es->es_oactive = 1;
        !           178:        es->es_if.if_flags |= IFF_UP|IFF_RUNNING;
        !           179:        enxint(unit);
        !           180:        splx(s);
        !           181:        if_rtinit(&es->es_if, RTF_UP);
        !           182: }
        !           183: 
        !           184: int    enalldelay = 0;
        !           185: int    enlastdel = 50;
        !           186: int    enlastmask = (~0) << 5;
        !           187: 
        !           188: /*
        !           189:  * Start or restart output on interface.
        !           190:  * If interface is already active, then this is a retransmit
        !           191:  * after a collision, and just restuff registers and delay.
        !           192:  * If interface is not already active, get another datagram
        !           193:  * to send off of the interface queue, and map it to the interface
        !           194:  * before starting the output.
        !           195:  */
        !           196: enstart(dev)
        !           197:        dev_t dev;
        !           198: {
        !           199:         int unit = ENUNIT(dev);
        !           200:        struct uba_device *ui = eninfo[unit];
        !           201:        register struct en_softc *es = &en_softc[unit];
        !           202:        register struct endevice *addr;
        !           203:        struct mbuf *m;
        !           204:        int dest;
        !           205: 
        !           206:        if (es->es_oactive)
        !           207:                goto restart;
        !           208: 
        !           209:        /*
        !           210:         * Not already active: dequeue another request
        !           211:         * and map it to the UNIBUS.  If no more requests,
        !           212:         * just return.
        !           213:         */
        !           214:        IF_DEQUEUE(&es->es_if.if_snd, m);
        !           215:        if (m == 0) {
        !           216:                es->es_oactive = 0;
        !           217:                return;
        !           218:        }
        !           219:        dest = mtod(m, struct en_header *)->en_dhost;
        !           220:        es->es_olen = if_wubaput(&es->es_ifuba, m);
        !           221: #ifdef ENF_SWABIPS
        !           222:        /*
        !           223:         * The Xerox interface does word at a time DMA, so
        !           224:         * someone must do byte swapping of user data if high
        !           225:         * and low ender machines are to communicate.  It doesn't
        !           226:         * belong here, but certain people depend on it, so...
        !           227:         *
        !           228:         * Should swab everybody, but this is a kludge anyway.
        !           229:         */
        !           230:        if (es->es_if.if_flags & ENF_SWABIPS) {
        !           231:                register struct en_header *en;
        !           232: 
        !           233:                en = (struct en_header *)es->es_ifuba.ifu_w.ifrw_addr;
        !           234:                if (en->en_type == ENTYPE_IP)
        !           235:                        enswab((caddr_t)(en + 1), (caddr_t)(en + 1),
        !           236:                            es->es_olen - sizeof (struct en_header) + 1);
        !           237:        }
        !           238: #endif
        !           239: 
        !           240:        /*
        !           241:         * Ethernet cannot take back-to-back packets (no
        !           242:         * buffering in interface.  To help avoid overrunning
        !           243:         * receivers, enforce a small delay (about 1ms) in interface:
        !           244:         *      * between all packets when enalldelay
        !           245:         *      * whenever last packet was broadcast
        !           246:         *      * whenever this packet is to same host as last packet
        !           247:         */
        !           248:        if (enalldelay || es->es_lastx == 0 || es->es_lastx == dest) {
        !           249:                es->es_delay = enlastdel;
        !           250:                es->es_mask = enlastmask;
        !           251:        }
        !           252:        es->es_lastx = dest;
        !           253: 
        !           254: restart:
        !           255:        /*
        !           256:         * Have request mapped to UNIBUS for transmission.
        !           257:         * Purge any stale data from this BDP, and start the otput.
        !           258:         */
        !           259:        if (es->es_ifuba.ifu_flags & UBA_NEEDBDP)
        !           260:                UBAPURGE(es->es_ifuba.ifu_uba, es->es_ifuba.ifu_w.ifrw_bdp);
        !           261:        addr = (struct endevice *)ui->ui_addr;
        !           262:        addr->en_oba = (int)es->es_ifuba.ifu_w.ifrw_info;
        !           263:        addr->en_odelay = es->es_delay;
        !           264:        addr->en_owc = -((es->es_olen + 1) >> 1);
        !           265:        addr->en_ostat = EN_IEN|EN_GO;
        !           266:        es->es_oactive = 1;
        !           267: }
        !           268: 
        !           269: /*
        !           270:  * Ethernet interface transmitter interrupt.
        !           271:  * Start another output if more data to send.
        !           272:  */
        !           273: enxint(unit)
        !           274:        int unit;
        !           275: {
        !           276:        register struct uba_device *ui = eninfo[unit];
        !           277:        register struct en_softc *es = &en_softc[unit];
        !           278:        register struct endevice *addr = (struct endevice *)ui->ui_addr;
        !           279: 
        !           280:        if (es->es_oactive == 0)
        !           281:                return;
        !           282:        if (es->es_mask && (addr->en_ostat&EN_OERROR)) {
        !           283:                es->es_if.if_oerrors++;
        !           284:                endocoll(unit);
        !           285:                return;
        !           286:        }
        !           287:        es->es_if.if_opackets++;
        !           288:        es->es_oactive = 0;
        !           289:        es->es_delay = 0;
        !           290:        es->es_mask = ~0;
        !           291:        if (es->es_ifuba.ifu_xtofree) {
        !           292:                m_freem(es->es_ifuba.ifu_xtofree);
        !           293:                es->es_ifuba.ifu_xtofree = 0;
        !           294:        }
        !           295:        if (es->es_if.if_snd.ifq_head == 0) {
        !           296:                es->es_lastx = 256;             /* putatively illegal */
        !           297:                return;
        !           298:        }
        !           299:        enstart(unit);
        !           300: }
        !           301: 
        !           302: /*
        !           303:  * Collision on ethernet interface.  Do exponential
        !           304:  * backoff, and retransmit.  If have backed off all
        !           305:  * the way print warning diagnostic, and drop packet.
        !           306:  */
        !           307: encollide(unit)
        !           308:        int unit;
        !           309: {
        !           310:        struct en_softc *es = &en_softc[unit];
        !           311: 
        !           312:        es->es_if.if_collisions++;
        !           313:        if (es->es_oactive == 0)
        !           314:                return;
        !           315:        endocoll(unit);
        !           316: }
        !           317: 
        !           318: endocoll(unit)
        !           319:        int unit;
        !           320: {
        !           321:        register struct en_softc *es = &en_softc[unit];
        !           322: 
        !           323:        /*
        !           324:         * Es_mask is a 16 bit number with n low zero bits, with
        !           325:         * n the number of backoffs.  When es_mask is 0 we have
        !           326:         * backed off 16 times, and give up.
        !           327:         */
        !           328:        if (es->es_mask == 0) {
        !           329:                printf("en%d: send error\n", unit);
        !           330:                enxint(unit);
        !           331:                return;
        !           332:        }
        !           333:        /*
        !           334:         * Another backoff.  Restart with delay based on n low bits
        !           335:         * of the interval timer.
        !           336:         */
        !           337:        es->es_mask <<= 1;
        !           338:        es->es_delay = mfpr(ICR) &~ es->es_mask;
        !           339:        enstart(unit);
        !           340: }
        !           341: 
        !           342: #ifdef notdef
        !           343: struct sockproto enproto = { AF_ETHERLINK };
        !           344: struct sockaddr_en endst = { AF_ETHERLINK };
        !           345: struct sockaddr_en ensrc = { AF_ETHERLINK };
        !           346: #endif
        !           347: /*
        !           348:  * Ethernet interface receiver interrupt.
        !           349:  * If input error just drop packet.
        !           350:  * Otherwise purge input buffered data path and examine 
        !           351:  * packet to determine type.  If can't determine length
        !           352:  * from type, then have to drop packet.  Othewise decapsulate
        !           353:  * packet based on type and pass to type specific higher-level
        !           354:  * input routine.
        !           355:  */
        !           356: enrint(unit)
        !           357:        int unit;
        !           358: {
        !           359:        register struct en_softc *es = &en_softc[unit];
        !           360:        struct endevice *addr = (struct endevice *)eninfo[unit]->ui_addr;
        !           361:        register struct en_header *en;
        !           362:        struct mbuf *m;
        !           363:        int len; short resid;
        !           364:        register struct ifqueue *inq;
        !           365:        int off;
        !           366: 
        !           367:        es->es_if.if_ipackets++;
        !           368: 
        !           369:        /*
        !           370:         * Purge BDP; drop if input error indicated.
        !           371:         */
        !           372:        if (es->es_ifuba.ifu_flags & UBA_NEEDBDP)
        !           373:                UBAPURGE(es->es_ifuba.ifu_uba, es->es_ifuba.ifu_r.ifrw_bdp);
        !           374:        if (addr->en_istat&EN_IERROR) {
        !           375:                es->es_if.if_ierrors++;
        !           376:                goto setup;
        !           377:        }
        !           378: 
        !           379:        /*
        !           380:         * Calculate input data length.
        !           381:         * Get pointer to ethernet header (in input buffer).
        !           382:         * Deal with trailer protocol: if type is PUP trailer
        !           383:         * get true type from first 16-bit word past data.
        !           384:         * Remember that type was trailer by setting off.
        !           385:         */
        !           386:        resid = addr->en_iwc;
        !           387:        if (resid)
        !           388:                resid |= 0176000;
        !           389:        len = (((sizeof (struct en_header) + ENMRU) >> 1) + resid) << 1;
        !           390:        len -= sizeof (struct en_header);
        !           391:        if (len > ENMRU)
        !           392:                goto setup;                     /* sanity */
        !           393:        en = (struct en_header *)(es->es_ifuba.ifu_r.ifrw_addr);
        !           394:        en->en_type = ntohs(en->en_type);
        !           395: #define        endataaddr(en, off, type)       ((type)(((caddr_t)((en)+1)+(off))))
        !           396:        if (en->en_type >= ENTYPE_TRAIL &&
        !           397:            en->en_type < ENTYPE_TRAIL+ENTYPE_NTRAILER) {
        !           398:                off = (en->en_type - ENTYPE_TRAIL) * 512;
        !           399:                if (off > ENMTU)
        !           400:                        goto setup;             /* sanity */
        !           401:                en->en_type = ntohs(*endataaddr(en, off, u_short *));
        !           402:                resid = ntohs(*(endataaddr(en, off+2, u_short *)));
        !           403:                if (off + resid > len)
        !           404:                        goto setup;             /* sanity */
        !           405:                len = off + resid;
        !           406:        } else
        !           407:                off = 0;
        !           408:        if (len == 0)
        !           409:                goto setup;
        !           410: #ifdef ENF_SWABIPS
        !           411:        if (es->es_if.if_flags & ENF_SWABIPS && en->en_type == ENTYPE_IP)
        !           412:                enswab((caddr_t)(en + 1), (caddr_t)(en + 1), len);
        !           413: #endif
        !           414:        /*
        !           415:         * Pull packet off interface.  Off is nonzero if packet
        !           416:         * has trailing header; if_rubaget will then force this header
        !           417:         * information to be at the front, but we still have to drop
        !           418:         * the type and length which are at the front of any trailer data.
        !           419:         */
        !           420:        m = if_rubaget(&es->es_ifuba, len, off);
        !           421:        if (m == 0)
        !           422:                goto setup;
        !           423:        if (off) {
        !           424:                m->m_off += 2 * sizeof (u_short);
        !           425:                m->m_len -= 2 * sizeof (u_short);
        !           426:        }
        !           427:        switch (en->en_type) {
        !           428: 
        !           429: #ifdef INET
        !           430:        case ENTYPE_IP:
        !           431:                schednetisr(NETISR_IP);
        !           432:                inq = &ipintrq;
        !           433:                break;
        !           434: #endif
        !           435: #ifdef PUP
        !           436:        case ENTYPE_PUP:
        !           437:                rpup_input(m);
        !           438:                goto setup;
        !           439: #endif
        !           440:        default:
        !           441: #ifdef notdef
        !           442:                enproto.sp_protocol = en->en_type;
        !           443:                endst.sen_host = en->en_dhost;
        !           444:                endst.sen_net = ensrc.sen_net = es->es_if.if_net;
        !           445:                ensrc.sen_host = en->en_shost;
        !           446:                raw_input(m, &enproto,
        !           447:                    (struct sockaddr *)&ensrc, (struct sockaddr *)&endst);
        !           448: #else
        !           449:                m_freem(m);
        !           450: #endif
        !           451:                goto setup;
        !           452:        }
        !           453: 
        !           454:        if (IF_QFULL(inq)) {
        !           455:                IF_DROP(inq);
        !           456:                m_freem(m);
        !           457:        } else
        !           458:                IF_ENQUEUE(inq, m);
        !           459: 
        !           460: setup:
        !           461:        /*
        !           462:         * Reset for next packet.
        !           463:         */
        !           464:        addr->en_iba = es->es_ifuba.ifu_r.ifrw_info;
        !           465:        addr->en_iwc = -(sizeof (struct en_header) + ENMRU) >> 1;
        !           466:        addr->en_istat = EN_IEN|EN_GO;
        !           467: }
        !           468: 
        !           469: /*
        !           470:  * Ethernet output routine.
        !           471:  * Encapsulate a packet of type family for the local net.
        !           472:  * Use trailer local net encapsulation if enough data in first
        !           473:  * packet leaves a multiple of 512 bytes of data in remainder.
        !           474:  */
        !           475: enoutput(ifp, m0, dst)
        !           476:        struct ifnet *ifp;
        !           477:        struct mbuf *m0;
        !           478:        struct sockaddr *dst;
        !           479: {
        !           480:        int type, dest, s, error;
        !           481:        register struct mbuf *m = m0;
        !           482:        register struct en_header *en;
        !           483:        register int off;
        !           484: 
        !           485:        switch (dst->sa_family) {
        !           486: 
        !           487: #ifdef INET
        !           488:        case AF_INET:
        !           489:                dest = ((struct sockaddr_in *)dst)->sin_addr.s_addr;
        !           490:                if (in_lnaof(*((struct in_addr *)&dest)) >= 0x100) {
        !           491:                        error = EPERM;          /* ??? */
        !           492:                        goto bad;
        !           493:                }
        !           494:                dest = (dest >> 24) & 0xff;
        !           495:                off = ntohs((u_short)mtod(m, struct ip *)->ip_len) - m->m_len;
        !           496:                /* need per host negotiation */
        !           497:                if ((ifp->if_flags & IFF_NOTRAILERS) == 0)
        !           498:                if (off > 0 && (off & 0x1ff) == 0 &&
        !           499:                    m->m_off >= MMINOFF + 2 * sizeof (u_short)) {
        !           500:                        type = ENTYPE_TRAIL + (off>>9);
        !           501:                        m->m_off -= 2 * sizeof (u_short);
        !           502:                        m->m_len += 2 * sizeof (u_short);
        !           503:                        *mtod(m, u_short *) = htons((u_short)ENTYPE_IP);
        !           504:                        *(mtod(m, u_short *) + 1) = ntohs((u_short)m->m_len);
        !           505:                        goto gottrailertype;
        !           506:                }
        !           507:                type = ENTYPE_IP;
        !           508:                off = 0;
        !           509:                goto gottype;
        !           510: #endif
        !           511: #ifdef PUP
        !           512:        case AF_PUP:
        !           513:                dest = ((struct sockaddr_pup *)dst)->spup_host;
        !           514:                type = ENTYPE_PUP;
        !           515:                off = 0;
        !           516:                goto gottype;
        !           517: #endif
        !           518: 
        !           519: #ifdef notdef
        !           520:        case AF_ETHERLINK:
        !           521:                goto gotheader;
        !           522: #endif
        !           523: 
        !           524:        default:
        !           525:                printf("en%d: can't handle af%d\n", ifp->if_unit,
        !           526:                        dst->sa_family);
        !           527:                error = EAFNOSUPPORT;
        !           528:                goto bad;
        !           529:        }
        !           530: 
        !           531: gottrailertype:
        !           532:        /*
        !           533:         * Packet to be sent as trailer: move first packet
        !           534:         * (control information) to end of chain.
        !           535:         */
        !           536:        while (m->m_next)
        !           537:                m = m->m_next;
        !           538:        m->m_next = m0;
        !           539:        m = m0->m_next;
        !           540:        m0->m_next = 0;
        !           541:        m0 = m;
        !           542: 
        !           543: gottype:
        !           544:        /*
        !           545:         * Add local net header.  If no space in first mbuf,
        !           546:         * allocate another.
        !           547:         */
        !           548:        if (m->m_off > MMAXOFF ||
        !           549:            MMINOFF + sizeof (struct en_header) > m->m_off) {
        !           550:                m = m_get(M_DONTWAIT, MT_HEADER);
        !           551:                if (m == 0) {
        !           552:                        error = ENOBUFS;
        !           553:                        goto bad;
        !           554:                }
        !           555:                m->m_next = m0;
        !           556:                m->m_off = MMINOFF;
        !           557:                m->m_len = sizeof (struct en_header);
        !           558:        } else {
        !           559:                m->m_off -= sizeof (struct en_header);
        !           560:                m->m_len += sizeof (struct en_header);
        !           561:        }
        !           562:        en = mtod(m, struct en_header *);
        !           563:        en->en_shost = ifp->if_host[0];
        !           564:        en->en_dhost = dest;
        !           565:        en->en_type = htons((u_short)type);
        !           566: 
        !           567: gotheader:
        !           568:        /*
        !           569:         * Queue message on interface, and start output if interface
        !           570:         * not yet active.
        !           571:         */
        !           572:        s = splimp();
        !           573:        if (IF_QFULL(&ifp->if_snd)) {
        !           574:                IF_DROP(&ifp->if_snd);
        !           575:                error = ENOBUFS;
        !           576:                goto qfull;
        !           577:        }
        !           578:        IF_ENQUEUE(&ifp->if_snd, m);
        !           579:        if (en_softc[ifp->if_unit].es_oactive == 0)
        !           580:                enstart(ifp->if_unit);
        !           581:        splx(s);
        !           582:        return (0);
        !           583: qfull:
        !           584:        m0 = m;
        !           585:        splx(s);
        !           586: bad:
        !           587:        m_freem(m0);
        !           588:        return (error);
        !           589: }
        !           590: 
        !           591: /*
        !           592:  * Process an ioctl request.
        !           593:  */
        !           594: enioctl(ifp, cmd, data)
        !           595:        register struct ifnet *ifp;
        !           596:        int cmd;
        !           597:        caddr_t data;
        !           598: {
        !           599:        struct ifreq *ifr = (struct ifreq *)data;
        !           600:        int s = splimp(), error = 0;
        !           601: 
        !           602:        switch (cmd) {
        !           603: 
        !           604:        case SIOCSIFADDR:
        !           605:                if (ifp->if_flags & IFF_RUNNING)
        !           606:                        if_rtinit(ifp, -1);     /* delete previous route */
        !           607:                ensetaddr(ifp, (struct sockaddr_in *)&ifr->ifr_addr);
        !           608:                if (ifp->if_flags & IFF_RUNNING)
        !           609:                        if_rtinit(ifp, RTF_UP);
        !           610:                else
        !           611:                        eninit(ifp->if_unit);
        !           612:                break;
        !           613: 
        !           614:        default:
        !           615:                error = EINVAL;
        !           616:        }
        !           617:        splx(s);
        !           618:        return (error);
        !           619: }
        !           620: 
        !           621: ensetaddr(ifp, sin)
        !           622:        register struct ifnet *ifp;
        !           623:        register struct sockaddr_in *sin;
        !           624: {
        !           625:        struct endevice *enaddr;
        !           626: 
        !           627:        ifp->if_net = in_netof(sin->sin_addr);
        !           628:        enaddr = (struct endevice *)eninfo[ifp->if_unit]->ui_addr;
        !           629:        ifp->if_host[0] = (~enaddr->en_addr) & 0xff;
        !           630:        sin = (struct sockaddr_in *)&ifp->if_addr;
        !           631:        sin->sin_family = AF_INET;
        !           632:        sin->sin_addr = if_makeaddr(ifp->if_net, ifp->if_host[0]);
        !           633:        sin = (struct sockaddr_in *)&ifp->if_broadaddr;
        !           634:        sin->sin_family = AF_INET;
        !           635:        sin->sin_addr = if_makeaddr(ifp->if_net, INADDR_ANY);
        !           636:        ifp->if_flags |= IFF_BROADCAST;
        !           637: }
        !           638: 
        !           639: #ifdef ENF_SWABIPS
        !           640: /*
        !           641:  * Swab bytes
        !           642:  * Jeffrey Mogul, Stanford
        !           643:  */
        !           644: enswab(from, to, n)
        !           645:        register caddr_t *from, *to;
        !           646:        register int n;
        !           647: {
        !           648:        register unsigned long temp;
        !           649:        
        !           650:        n >>= 1; n++;
        !           651: #define        STEP    temp = *from++,*to++ = *from++,*to++ = temp
        !           652:        /* round to multiple of 8 */
        !           653:        while ((--n) & 07)
        !           654:                STEP;
        !           655:        n >>= 3;
        !           656:        while (--n >= 0) {
        !           657:                STEP; STEP; STEP; STEP;
        !           658:                STEP; STEP; STEP; STEP;
        !           659:        }
        !           660: }
        !           661: #endif

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