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Annotation of 43BSDReno/sys/vaxif/if_en.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 is only permitted until one year after the first shipment
        !             6:  * of 4.4BSD by the Regents.  Otherwise, redistribution and use in source and
        !             7:  * binary forms are permitted provided that: (1) source distributions retain
        !             8:  * this entire copyright notice and comment, and (2) distributions including
        !             9:  * binaries display the following acknowledgement:  This product includes
        !            10:  * software developed by the University of California, Berkeley and its
        !            11:  * contributors'' in the documentation or other materials provided with the
        !            12:  * distribution and in all advertising materials mentioning features or use
        !            13:  * of this software.  Neither the name of the University nor the names of
        !            14:  * its contributors may be used to endorse or promote products derived from
        !            15:  * this software without specific prior written permission.
        !            16:  * THIS SOFTWARE IS PROVIDED AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
        !            17:  * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
        !            18:  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
        !            19:  *
        !            20:  *     @(#)if_en.c     7.6 (Berkeley) 6/28/90
        !            21:  */
        !            22: 
        !            23: #include "en.h"
        !            24: #if NEN > 0
        !            25: 
        !            26: /*
        !            27:  * Xerox prototype (3 Mb) Ethernet interface driver.
        !            28:  */
        !            29: #include "machine/pte.h"
        !            30: 
        !            31: #include "param.h"
        !            32: #include "systm.h"
        !            33: #include "mbuf.h"
        !            34: #include "buf.h"
        !            35: #include "protosw.h"
        !            36: #include "socket.h"
        !            37: #include "vmmac.h"
        !            38: #include "errno.h"
        !            39: #include "ioctl.h"
        !            40: 
        !            41: #include "../net/if.h"
        !            42: #include "../net/netisr.h"
        !            43: #include "../net/route.h"
        !            44: 
        !            45: #ifdef INET
        !            46: #include "../netinet/in.h"
        !            47: #include "../netinet/in_systm.h"
        !            48: #include "../netinet/in_var.h"
        !            49: #include "../netinet/ip.h"
        !            50: #endif
        !            51: 
        !            52: #ifdef PUP
        !            53: #include "../netpup/pup.h"
        !            54: #include "../netpup/ether.h"
        !            55: #endif
        !            56: 
        !            57: #ifdef NS
        !            58: #include "../netns/ns.h"
        !            59: #include "../netns/ns_if.h"
        !            60: #endif
        !            61: 
        !            62: #include "../vax/cpu.h"
        !            63: #include "../vax/mtpr.h"
        !            64: #include "if_en.h"
        !            65: #include "if_enreg.h"
        !            66: #include "if_uba.h"
        !            67: #include "../vaxuba/ubareg.h"
        !            68: #include "../vaxuba/ubavar.h"
        !            69: 
        !            70: #define        ENMTU   (1024+512)
        !            71: #define        ENMRU   (1024+512+16)           /* 16 is enough to receive trailer */
        !            72: 
        !            73: int    enprobe(), enattach(), enrint(), enxint(), encollide();
        !            74: struct uba_device *eninfo[NEN];
        !            75: u_short enstd[] = { 0 };
        !            76: struct uba_driver endriver =
        !            77:        { enprobe, 0, enattach, 0, enstd, "en", eninfo };
        !            78: #define        ENUNIT(x)       minor(x)
        !            79: 
        !            80: int    eninit(),oldenoutput(),enreset(),enioctl(), enstart();
        !            81: 
        !            82: #ifdef notdef
        !            83: /*
        !            84:  * If you need to byte swap IP's in the system, define
        !            85:  * this and do a SIOCSIFFLAGS at boot time.
        !            86:  */
        !            87: #define        ENF_SWABIPS     0x1000
        !            88: #endif
        !            89: 
        !            90: /*
        !            91:  * Ethernet software status per interface.
        !            92:  *
        !            93:  * Each interface is referenced by a network interface structure,
        !            94:  * es_if, which the routing code uses to locate the interface.
        !            95:  * This structure contains the output queue for the interface, its address, ...
        !            96:  * We also have, for each interface, a UBA interface structure, which
        !            97:  * contains information about the UNIBUS resources held by the interface:
        !            98:  * map registers, buffered data paths, etc.  Information is cached in this
        !            99:  * structure for use by the if_uba.c routines in running the interface
        !           100:  * efficiently.
        !           101:  */
        !           102: struct en_softc {
        !           103:        struct  ifnet es_if;            /* network-visible interface */
        !           104:        struct  ifuba es_ifuba;         /* UNIBUS resources */
        !           105:        short   es_host;                /* hardware host number */
        !           106:        short   es_delay;               /* current output delay */
        !           107:        short   es_mask;                /* mask for current output delay */
        !           108:        short   es_lastx;               /* host last transmitted to */
        !           109:        short   es_oactive;             /* is output active? */
        !           110:        short   es_olen;                /* length of last output */
        !           111:        short   es_nsactive;            /* is interface enabled for ns? */
        !           112: } en_softc[NEN];
        !           113: 
        !           114: /*
        !           115:  * Do output DMA to determine interface presence and
        !           116:  * interrupt vector.  DMA is too short to disturb other hosts.
        !           117:  */
        !           118: enprobe(reg)
        !           119:        caddr_t reg;
        !           120: {
        !           121:        register int br, cvec;          /* r11, r10 value-result */
        !           122:        register struct endevice *addr = (struct endevice *)reg;
        !           123: 
        !           124: #ifdef lint
        !           125:        br = 0; cvec = br; br = cvec;
        !           126:        enrint(0); enxint(0); encollide(0);
        !           127: #endif
        !           128:        addr->en_istat = 0;
        !           129:        addr->en_owc = -1;
        !           130:        addr->en_oba = 0;
        !           131:        addr->en_ostat = EN_IEN|EN_GO;
        !           132:        DELAY(100000);
        !           133:        addr->en_ostat = 0;
        !           134:        return (1);
        !           135: }
        !           136: 
        !           137: /*
        !           138:  * Interface exists: make available by filling in network interface
        !           139:  * record.  System will initialize the interface when it is ready
        !           140:  * to accept packets.
        !           141:  */
        !           142: enattach(ui)
        !           143:        struct uba_device *ui;
        !           144: {
        !           145:        register struct en_softc *es = &en_softc[ui->ui_unit];
        !           146: 
        !           147:        es->es_if.if_unit = ui->ui_unit;
        !           148:        es->es_if.if_name = "en";
        !           149:        es->es_if.if_mtu = ENMTU;
        !           150:        es->es_if.if_flags = IFF_BROADCAST;
        !           151:        es->es_if.if_init = eninit;
        !           152:        es->es_if.if_output = oldenoutput;
        !           153:        es->es_if.if_start = enstart;
        !           154:        es->es_if.if_ioctl = enioctl;
        !           155:        es->es_if.if_reset = enreset;
        !           156:        es->es_ifuba.ifu_flags = UBA_NEEDBDP | UBA_NEED16 | UBA_CANTWAIT;
        !           157: #if defined(VAX750)
        !           158:        /* don't chew up 750 bdp's */
        !           159:        if (cpu == VAX_750 && ui->ui_unit > 0)
        !           160:                es->es_ifuba.ifu_flags &= ~UBA_NEEDBDP;
        !           161: #endif
        !           162:        if_attach(&es->es_if);
        !           163: }
        !           164: 
        !           165: /*
        !           166:  * Reset of interface after UNIBUS reset.
        !           167:  * If interface is on specified uba, reset its state.
        !           168:  */
        !           169: enreset(unit, uban)
        !           170:        int unit, uban;
        !           171: {
        !           172:        register struct uba_device *ui;
        !           173: 
        !           174:        if (unit >= NEN || (ui = eninfo[unit]) == 0 || ui->ui_alive == 0 ||
        !           175:            ui->ui_ubanum != uban)
        !           176:                return;
        !           177:        printf(" en%d", unit);
        !           178:        eninit(unit);
        !           179: }
        !           180: 
        !           181: /*
        !           182:  * Initialization of interface; clear recorded pending
        !           183:  * operations, and reinitialize UNIBUS usage.
        !           184:  */
        !           185: eninit(unit)
        !           186:        int unit;
        !           187: {
        !           188:        register struct en_softc *es = &en_softc[unit];
        !           189:        register struct uba_device *ui = eninfo[unit];
        !           190:        register struct endevice *addr;
        !           191:        int s;
        !           192: 
        !           193:        if (es->es_if.if_addrlist == (struct ifaddr *)0)
        !           194:                return;
        !           195:        if (if_ubainit(&es->es_ifuba, ui->ui_ubanum,
        !           196:            sizeof (struct en_header), (int)btoc(ENMRU)) == 0) { 
        !           197:                printf("en%d: can't initialize\n", unit);
        !           198:                es->es_if.if_flags &= ~IFF_UP;
        !           199:                return;
        !           200:        }
        !           201:        addr = (struct endevice *)ui->ui_addr;
        !           202:        addr->en_istat = addr->en_ostat = 0;
        !           203: 
        !           204:        /*
        !           205:         * Hang a receive and start any
        !           206:         * pending writes by faking a transmit complete.
        !           207:         */
        !           208:        s = splimp();
        !           209:        addr->en_iba = es->es_ifuba.ifu_r.ifrw_info;
        !           210:        addr->en_iwc = -(sizeof (struct en_header) + ENMRU) >> 1;
        !           211:        addr->en_istat = EN_IEN|EN_GO;
        !           212:        es->es_oactive = 1;
        !           213:        es->es_if.if_flags |= IFF_RUNNING;
        !           214:        enxint(unit);
        !           215:        splx(s);
        !           216: }
        !           217: 
        !           218: int    enalldelay = 0;
        !           219: int    enlastdel = 50;
        !           220: int    enlastmask = (~0) << 5;
        !           221: 
        !           222: /*
        !           223:  * Start or restart output on interface.
        !           224:  * If interface is already active, then this is a retransmit
        !           225:  * after a collision, and just restuff registers and delay.
        !           226:  * If interface is not already active, get another datagram
        !           227:  * to send off of the interface queue, and map it to the interface
        !           228:  * before starting the output.
        !           229:  */
        !           230: enstart(dev)
        !           231:        dev_t dev;
        !           232: {
        !           233:         int unit = ENUNIT(dev);
        !           234:        struct uba_device *ui = eninfo[unit];
        !           235:        register struct en_softc *es = &en_softc[unit];
        !           236:        register struct endevice *addr;
        !           237:        register struct en_header *en;
        !           238:        struct mbuf *m;
        !           239:        int dest;
        !           240: 
        !           241:        if (es->es_oactive)
        !           242:                goto restart;
        !           243: 
        !           244:        /*
        !           245:         * Not already active: dequeue another request
        !           246:         * and map it to the UNIBUS.  If no more requests,
        !           247:         * just return.
        !           248:         */
        !           249:        IF_DEQUEUE(&es->es_if.if_snd, m);
        !           250:        if (m == 0) {
        !           251:                es->es_oactive = 0;
        !           252:                return;
        !           253:        }
        !           254:        en = mtod(m, struct en_header *);
        !           255:        dest = en->en_dhost;
        !           256:        en->en_shost = es->es_host;
        !           257:        es->es_olen = if_wubaput(&es->es_ifuba, m);
        !           258: #ifdef ENF_SWABIPS
        !           259:        /*
        !           260:         * The Xerox interface does word at a time DMA, so
        !           261:         * someone must do byte swapping of user data if high
        !           262:         * and low ender machines are to communicate.  It doesn't
        !           263:         * belong here, but certain people depend on it, so...
        !           264:         *
        !           265:         * Should swab everybody, but this is a kludge anyway.
        !           266:         */
        !           267:        if (es->es_if.if_flags & ENF_SWABIPS) {
        !           268:                en = (struct en_header *)es->es_ifuba.ifu_w.ifrw_addr;
        !           269:                if (en->en_type == ENTYPE_IP)
        !           270:                        enswab((caddr_t)(en + 1), (caddr_t)(en + 1),
        !           271:                            es->es_olen - sizeof (struct en_header) + 1);
        !           272:        }
        !           273: #endif
        !           274: 
        !           275:        /*
        !           276:         * Ethernet cannot take back-to-back packets (no
        !           277:         * buffering in interface.  To help avoid overrunning
        !           278:         * receivers, enforce a small delay (about 1ms) in interface:
        !           279:         *      * between all packets when enalldelay
        !           280:         *      * whenever last packet was broadcast
        !           281:         *      * whenever this packet is to same host as last packet
        !           282:         */
        !           283:        if (enalldelay || es->es_lastx == 0 || es->es_lastx == dest) {
        !           284:                es->es_delay = enlastdel;
        !           285:                es->es_mask = enlastmask;
        !           286:        }
        !           287:        es->es_lastx = dest;
        !           288: 
        !           289: restart:
        !           290:        /*
        !           291:         * Have request mapped to UNIBUS for transmission.
        !           292:         * Purge any stale data from this BDP, and start the otput.
        !           293:         */
        !           294:        if (es->es_ifuba.ifu_flags & UBA_NEEDBDP)
        !           295:                UBAPURGE(es->es_ifuba.ifu_uba, es->es_ifuba.ifu_w.ifrw_bdp);
        !           296:        addr = (struct endevice *)ui->ui_addr;
        !           297:        addr->en_oba = (int)es->es_ifuba.ifu_w.ifrw_info;
        !           298:        addr->en_odelay = es->es_delay;
        !           299:        addr->en_owc = -((es->es_olen + 1) >> 1);
        !           300:        addr->en_ostat = EN_IEN|EN_GO;
        !           301:        es->es_oactive = 1;
        !           302: }
        !           303: 
        !           304: /*
        !           305:  * Ethernet interface transmitter interrupt.
        !           306:  * Start another output if more data to send.
        !           307:  */
        !           308: enxint(unit)
        !           309:        int unit;
        !           310: {
        !           311:        register struct uba_device *ui = eninfo[unit];
        !           312:        register struct en_softc *es = &en_softc[unit];
        !           313:        register struct endevice *addr = (struct endevice *)ui->ui_addr;
        !           314: 
        !           315:        if (es->es_oactive == 0)
        !           316:                return;
        !           317:        if (es->es_mask && (addr->en_ostat&EN_OERROR)) {
        !           318:                es->es_if.if_oerrors++;
        !           319:                endocoll(unit);
        !           320:                return;
        !           321:        }
        !           322:        es->es_if.if_opackets++;
        !           323:        es->es_oactive = 0;
        !           324:        es->es_delay = 0;
        !           325:        es->es_mask = ~0;
        !           326:        if (es->es_ifuba.ifu_xtofree) {
        !           327:                m_freem(es->es_ifuba.ifu_xtofree);
        !           328:                es->es_ifuba.ifu_xtofree = 0;
        !           329:        }
        !           330:        if (es->es_if.if_snd.ifq_head == 0) {
        !           331:                es->es_lastx = 256;             /* putatively illegal */
        !           332:                return;
        !           333:        }
        !           334:        enstart(unit);
        !           335: }
        !           336: 
        !           337: /*
        !           338:  * Collision on ethernet interface.  Do exponential
        !           339:  * backoff, and retransmit.  If have backed off all
        !           340:  * the way print warning diagnostic, and drop packet.
        !           341:  */
        !           342: encollide(unit)
        !           343:        int unit;
        !           344: {
        !           345:        struct en_softc *es = &en_softc[unit];
        !           346: 
        !           347:        es->es_if.if_collisions++;
        !           348:        if (es->es_oactive == 0)
        !           349:                return;
        !           350:        endocoll(unit);
        !           351: }
        !           352: 
        !           353: endocoll(unit)
        !           354:        int unit;
        !           355: {
        !           356:        register struct en_softc *es = &en_softc[unit];
        !           357: 
        !           358:        /*
        !           359:         * Es_mask is a 16 bit number with n low zero bits, with
        !           360:         * n the number of backoffs.  When es_mask is 0 we have
        !           361:         * backed off 16 times, and give up.
        !           362:         */
        !           363:        if (es->es_mask == 0) {
        !           364:                printf("en%d: send error\n", unit);
        !           365:                enxint(unit);
        !           366:                return;
        !           367:        }
        !           368:        /*
        !           369:         * Another backoff.  Restart with delay based on n low bits
        !           370:         * of the interval timer.
        !           371:         */
        !           372:        es->es_mask <<= 1;
        !           373:        es->es_delay = mfpr(ICR) &~ es->es_mask;
        !           374:        enstart(unit);
        !           375: }
        !           376: 
        !           377: #ifdef notdef
        !           378: struct sockproto enproto = { AF_ETHERLINK };
        !           379: struct sockaddr_en endst = { sizeof(endst), AF_ETHERLINK };
        !           380: struct sockaddr_en ensrc = { sizeof(ensrc), AF_ETHERLINK };
        !           381: #endif
        !           382: /*
        !           383:  * Ethernet interface receiver interrupt.
        !           384:  * If input error just drop packet.
        !           385:  * Otherwise purge input buffered data path and examine 
        !           386:  * packet to determine type.  If can't determine length
        !           387:  * from type, then have to drop packet.  Othewise decapsulate
        !           388:  * packet based on type and pass to type specific higher-level
        !           389:  * input routine.
        !           390:  */
        !           391: enrint(unit)
        !           392:        int unit;
        !           393: {
        !           394:        register struct en_softc *es = &en_softc[unit];
        !           395:        struct endevice *addr = (struct endevice *)eninfo[unit]->ui_addr;
        !           396:        register struct en_header *en;
        !           397:        struct mbuf *m;
        !           398:        int len; short resid;
        !           399:        register struct ifqueue *inq;
        !           400:        int off, s;
        !           401: 
        !           402:        es->es_if.if_ipackets++;
        !           403: 
        !           404:        /*
        !           405:         * Purge BDP; drop if input error indicated.
        !           406:         */
        !           407:        if (es->es_ifuba.ifu_flags & UBA_NEEDBDP)
        !           408:                UBAPURGE(es->es_ifuba.ifu_uba, es->es_ifuba.ifu_r.ifrw_bdp);
        !           409:        if (addr->en_istat&EN_IERROR) {
        !           410:                es->es_if.if_ierrors++;
        !           411:                goto setup;
        !           412:        }
        !           413: 
        !           414:        /*
        !           415:         * Calculate input data length.
        !           416:         * Get pointer to ethernet header (in input buffer).
        !           417:         * Deal with trailer protocol: if type is PUP trailer
        !           418:         * get true type from first 16-bit word past data.
        !           419:         * Remember that type was trailer by setting off.
        !           420:         */
        !           421:        resid = addr->en_iwc;
        !           422:        if (resid)
        !           423:                resid |= 0176000;
        !           424:        len = (((sizeof (struct en_header) + ENMRU) >> 1) + resid) << 1;
        !           425:        len -= sizeof (struct en_header);
        !           426:        if (len > ENMRU)
        !           427:                goto setup;                     /* sanity */
        !           428:        en = (struct en_header *)(es->es_ifuba.ifu_r.ifrw_addr);
        !           429:        en->en_type = ntohs(en->en_type);
        !           430: #define        endataaddr(en, off, type)       ((type)(((caddr_t)((en)+1)+(off))))
        !           431:        if (en->en_type >= ENTYPE_TRAIL &&
        !           432:            en->en_type < ENTYPE_TRAIL+ENTYPE_NTRAILER) {
        !           433:                off = (en->en_type - ENTYPE_TRAIL) * 512;
        !           434:                if (off > ENMTU)
        !           435:                        goto setup;             /* sanity */
        !           436:                en->en_type = ntohs(*endataaddr(en, off, u_short *));
        !           437:                resid = ntohs(*(endataaddr(en, off+2, u_short *)));
        !           438:                if (off + resid > len)
        !           439:                        goto setup;             /* sanity */
        !           440:                len = off + resid;
        !           441:        } else
        !           442:                off = 0;
        !           443:        if (len == 0)
        !           444:                goto setup;
        !           445: #ifdef ENF_SWABIPS
        !           446:        if (es->es_if.if_flags & ENF_SWABIPS && en->en_type == ENTYPE_IP)
        !           447:                enswab((caddr_t)(en + 1), (caddr_t)(en + 1), len);
        !           448: #endif
        !           449:        /*
        !           450:         * Pull packet off interface.  Off is nonzero if packet
        !           451:         * has trailing header; if_rubaget will then force this header
        !           452:         * information to be at the front, but we still have to drop
        !           453:         * the type and length which are at the front of any trailer data.
        !           454:         */
        !           455:        m = if_rubaget(&es->es_ifuba, len, off, &es->es_if);
        !           456:        if (m == 0)
        !           457:                goto setup;
        !           458:        switch (en->en_type) {
        !           459: 
        !           460: #ifdef INET
        !           461:        case ENTYPE_IP:
        !           462:                schednetisr(NETISR_IP);
        !           463:                inq = &ipintrq;
        !           464:                break;
        !           465: #endif
        !           466: #ifdef PUP
        !           467:        case ENTYPE_PUP:
        !           468:                rpup_input(m);
        !           469:                goto setup;
        !           470: #endif
        !           471: #ifdef NS
        !           472:        case ETHERTYPE_NS:
        !           473:                if (es->es_nsactive) {
        !           474:                        schednetisr(NETISR_NS);
        !           475:                        inq = &nsintrq;
        !           476:                } else {
        !           477:                        m_freem(m);
        !           478:                        goto setup;
        !           479:                }
        !           480:                break;
        !           481: #endif
        !           482: 
        !           483:        default:
        !           484: #ifdef notdef
        !           485:                enproto.sp_protocol = en->en_type;
        !           486:                endst.sen_host = en->en_dhost;
        !           487:                endst.sen_net = ensrc.sen_net = es->es_if.if_net;
        !           488:                ensrc.sen_host = en->en_shost;
        !           489:                raw_input(m, &enproto,
        !           490:                    (struct sockaddr *)&ensrc, (struct sockaddr *)&endst);
        !           491: #else
        !           492:                m_freem(m);
        !           493: #endif
        !           494:                goto setup;
        !           495:        }
        !           496: 
        !           497:        s = splimp();
        !           498:        if (IF_QFULL(inq)) {
        !           499:                IF_DROP(inq);
        !           500:                m_freem(m);
        !           501:        } else
        !           502:                IF_ENQUEUE(inq, m);
        !           503:        splx(s);
        !           504: 
        !           505: setup:
        !           506:        /*
        !           507:         * Reset for next packet.
        !           508:         */
        !           509:        addr->en_iba = es->es_ifuba.ifu_r.ifrw_info;
        !           510:        addr->en_iwc = -(sizeof (struct en_header) + ENMRU) >> 1;
        !           511:        addr->en_istat = EN_IEN|EN_GO;
        !           512: }
        !           513: 
        !           514: /*
        !           515:  * Ethernet output routine.
        !           516:  * Encapsulate a packet of type family for the local net.
        !           517:  * Use trailer local net encapsulation if enough data in first
        !           518:  * packet leaves a multiple of 512 bytes of data in remainder.
        !           519:  */
        !           520: oldenoutput(ifp, m0, dst)
        !           521:        struct ifnet *ifp;
        !           522:        struct mbuf *m0;
        !           523:        struct sockaddr *dst;
        !           524: {
        !           525:        int type, dest, s, error;
        !           526:        register struct mbuf *m = m0;
        !           527:        register struct en_header *en;
        !           528:        register int off;
        !           529: 
        !           530:        if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) != (IFF_UP|IFF_RUNNING)) {
        !           531:                error = ENETDOWN;
        !           532:                goto bad;
        !           533:        }
        !           534:        switch (dst->sa_family) {
        !           535: 
        !           536: #ifdef INET
        !           537:        case AF_INET:
        !           538:                {
        !           539:                struct in_addr in;
        !           540: 
        !           541:                in = ((struct sockaddr_in *)dst)->sin_addr;
        !           542:                if (in_broadcast(in))
        !           543:                        dest = EN_BROADCAST;
        !           544:                else
        !           545:                        dest = in_lnaof(in);
        !           546:                }
        !           547:                if (dest >= 0x100) {
        !           548:                        error = EPERM;          /* ??? */
        !           549:                        goto bad;
        !           550:                }
        !           551:                off = m->m_pkthdr.len - m->m_len;
        !           552:                /* need per host negotiation */
        !           553:                if ((ifp->if_flags & IFF_NOTRAILERS) == 0)
        !           554:                if (off > 0 && (off & 0x1ff) == 0 &&
        !           555:                    (m->m_flags & M_EXT) == 0 &&
        !           556:                    m->m_data >= m->m_pktdat + 2 * sizeof (u_short)) {
        !           557:                        type = ENTYPE_TRAIL + (off>>9);
        !           558:                        m->m_data -= 2 * sizeof (u_short);
        !           559:                        m->m_len += 2 * sizeof (u_short);
        !           560:                        *mtod(m, u_short *) = htons((u_short)ENTYPE_IP);
        !           561:                        *(mtod(m, u_short *) + 1) = ntohs((u_short)m->m_len);
        !           562:                        goto gottrailertype;
        !           563:                }
        !           564:                type = ENTYPE_IP;
        !           565:                off = 0;
        !           566:                goto gottype;
        !           567: #endif
        !           568: #ifdef NS
        !           569:        case AF_NS:
        !           570:        {
        !           571:                u_char *up;
        !           572: 
        !           573:                type = ETHERTYPE_NS;
        !           574:                up = ((struct sockaddr_ns *)dst)->sns_addr.x_host.c_host;
        !           575:                if (*up & 1)
        !           576:                        dest = EN_BROADCAST;
        !           577:                else
        !           578:                        dest = up[5];
        !           579: 
        !           580:                off = 0;
        !           581:                goto gottype;
        !           582:        }
        !           583: #endif
        !           584: #ifdef PUP
        !           585:        case AF_PUP:
        !           586:                dest = ((struct sockaddr_pup *)dst)->spup_host;
        !           587:                type = ENTYPE_PUP;
        !           588:                off = 0;
        !           589:                goto gottype;
        !           590: #endif
        !           591: 
        !           592: #ifdef notdef
        !           593:        case AF_ETHERLINK:
        !           594:                goto gotheader;
        !           595: #endif
        !           596: 
        !           597:        default:
        !           598:                printf("en%d: can't handle af%d\n", ifp->if_unit,
        !           599:                        dst->sa_family);
        !           600:                error = EAFNOSUPPORT;
        !           601:                goto bad;
        !           602:        }
        !           603: 
        !           604: gottrailertype:
        !           605:        /*
        !           606:         * Packet to be sent as trailer: move first packet
        !           607:         * (control information) to end of chain.
        !           608:         */
        !           609:        while (m->m_next)
        !           610:                m = m->m_next;
        !           611:        m->m_next = m0;
        !           612:        m = m0->m_next;
        !           613:        m0->m_next = 0;
        !           614:        m0 = m;
        !           615: 
        !           616: gottype:
        !           617:        /*
        !           618:         * Add local net header.  If no space in first mbuf,
        !           619:         * allocate another.
        !           620:         */
        !           621:        M_PREPEND(m, sizeof (struct en_header), M_DONTWAIT);
        !           622:        if (m == NULL)
        !           623:                return (ENOBUFS);
        !           624:        en = mtod(m, struct en_header *);
        !           625:        /* add en_shost later */
        !           626:        en->en_dhost = dest;
        !           627:        en->en_type = htons((u_short)type);
        !           628: 
        !           629: #ifdef notdef
        !           630: gotheader:
        !           631: #endif
        !           632:        /*
        !           633:         * Queue message on interface, and start output if interface
        !           634:         * not yet active.
        !           635:         */
        !           636:        s = splimp();
        !           637:        if (IF_QFULL(&ifp->if_snd)) {
        !           638:                IF_DROP(&ifp->if_snd);
        !           639:                error = ENOBUFS;
        !           640:                goto qfull;
        !           641:        }
        !           642:        IF_ENQUEUE(&ifp->if_snd, m);
        !           643:        if (en_softc[ifp->if_unit].es_oactive == 0)
        !           644:                enstart(ifp->if_unit);
        !           645:        splx(s);
        !           646:        return (0);
        !           647: qfull:
        !           648:        m0 = m;
        !           649:        splx(s);
        !           650: bad:
        !           651:        m_freem(m0);
        !           652:        return (error);
        !           653: }
        !           654: 
        !           655: /*
        !           656:  * Process an ioctl request.
        !           657:  */
        !           658: enioctl(ifp, cmd, data)
        !           659:        register struct ifnet *ifp;
        !           660:        int cmd;
        !           661:        caddr_t data;
        !           662: {
        !           663:        register struct en_softc *es = ((struct en_softc *)ifp);
        !           664:        struct ifaddr *ifa = (struct ifaddr *) data;
        !           665:        int s = splimp(), error = 0;
        !           666:        struct endevice *enaddr;
        !           667: 
        !           668:        switch (cmd) {
        !           669: 
        !           670:        case SIOCSIFADDR:
        !           671:                enaddr = (struct endevice *)eninfo[ifp->if_unit]->ui_addr;
        !           672:                es->es_host = (~enaddr->en_addr) & 0xff;
        !           673:                /*
        !           674:                 * Attempt to check agreement of protocol address
        !           675:                 * and board address.
        !           676:                 */
        !           677:                switch (ifa->ifa_addr->sa_family) {
        !           678:                case AF_INET:
        !           679:                        if (in_lnaof(IA_SIN(ifa)->sin_addr) != es->es_host)
        !           680:                                return (EADDRNOTAVAIL);
        !           681:                        break;
        !           682: #ifdef NS
        !           683:                case AF_NS:
        !           684:                        if (IA_SNS(ifa)->sns_addr.x_host.c_host[5]
        !           685:                                                        != es->es_host)
        !           686:                                return (EADDRNOTAVAIL);
        !           687:                        es->es_nsactive = 1;
        !           688:                        break;
        !           689: #endif
        !           690:                }
        !           691:                ifp->if_flags |= IFF_UP;
        !           692:                if ((ifp->if_flags & IFF_RUNNING) == 0)
        !           693:                        eninit(ifp->if_unit);
        !           694:                break;
        !           695: 
        !           696:        default:
        !           697:                error = EINVAL;
        !           698:                break;
        !           699:        }
        !           700:        splx(s);
        !           701:        return (error);
        !           702: }
        !           703: 
        !           704: #ifdef ENF_SWABIPS
        !           705: /*
        !           706:  * Swab bytes
        !           707:  * Jeffrey Mogul, Stanford
        !           708:  */
        !           709: enswab(from, to, n)
        !           710:        register unsigned char *from, *to;
        !           711:        register int n;
        !           712: {
        !           713:        register unsigned long temp;
        !           714: 
        !           715:        if ((n <= 0) || (n > 0xFFFF)) {
        !           716:                printf("enswab: bad len %d\n", n);
        !           717:                return;
        !           718:        }
        !           719:        
        !           720:        n >>= 1; n++;
        !           721: #define        STEP    {temp = *from++;*to++ = *from++;*to++ = temp;}
        !           722:        /* round to multiple of 8 */
        !           723:        while ((--n) & 07)
        !           724:                STEP;
        !           725:        n >>= 3;
        !           726:        while (--n >= 0) {
        !           727:                STEP; STEP; STEP; STEP;
        !           728:                STEP; STEP; STEP; STEP;
        !           729:        }
        !           730: }
        !           731: #endif
        !           732: #endif

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