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Annotation of 43BSDReno/sys/vaxif/if_pcl.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_pcl.c    7.5 (Berkeley) 6/28/90
        !            21:  */
        !            22: 
        !            23: #include "pcl.h"
        !            24: #if NPCL > 0
        !            25: /*
        !            26:  * DEC CSS PCL-11B Parallel Communications Interface
        !            27:  *
        !            28:  * Written by Mike Muuss and Jeff Schwab.
        !            29:  */
        !            30: #include "machine/pte.h"
        !            31: 
        !            32: #include "param.h"
        !            33: #include "systm.h"
        !            34: #include "mbuf.h"
        !            35: #include "buf.h"
        !            36: #include "protosw.h"
        !            37: #include "socket.h"
        !            38: #include "vmmac.h"
        !            39: #include "ioctl.h"
        !            40: #include "errno.h"
        !            41: 
        !            42: #include "../net/if.h"
        !            43: #include "../net/netisr.h"
        !            44: #include "../net/route.h"
        !            45: 
        !            46: #ifdef INET
        !            47: #include "../netinet/in.h"
        !            48: #include "../netinet/in_systm.h"
        !            49: #include "../netinet/in_var.h"
        !            50: #include "../netinet/ip.h"
        !            51: #endif
        !            52: 
        !            53: #include "../vax/cpu.h"
        !            54: #include "../vax/mtpr.h"
        !            55: #include "if_pclreg.h"
        !            56: #include "if_uba.h"
        !            57: #include "../vaxuba/ubareg.h"
        !            58: #include "../vaxuba/ubavar.h"
        !            59: 
        !            60: /* The MTU has been carefully selected to prevent fragmentation <-> ArpaNet */
        !            61: #define        PCLMTU          (1006)  /* Max transmission unit (bytes) */
        !            62: #define        PCLMAXTDM       7       /* Max unit number on TDM bus */
        !            63: 
        !            64: int    pclprobe(), pclattach(), pclrint(), pclxint();
        !            65: int    pclinit(), pclioctl(), pcloutput(), pclreset();
        !            66: 
        !            67: struct uba_device      *pclinfo[NPCL];
        !            68: u_short pclstd[] = { 0 };
        !            69: #define        PCLUNIT(x)      minor(x)
        !            70: struct uba_driver pcldriver =
        !            71:        { pclprobe, 0, pclattach, 0, pclstd, "pcl", pclinfo };
        !            72: 
        !            73: /*
        !            74:  * PCL software status per interface.
        !            75:  *
        !            76:  * Each interface is referenced by a network interface structure,
        !            77:  * sc_if, which the routing code uses to locate the interface.
        !            78:  * This structure contains the output queue for the interface, its address, ...
        !            79:  * We also have, for each interface, a UBA interface structure, which
        !            80:  * contains information about the UNIBUS resources held by the interface:
        !            81:  * map registers, buffered data paths, etc.  Information is cached in this
        !            82:  * structure for use by the if_uba.c routines in running the interface
        !            83:  * efficiently.
        !            84:  */
        !            85: struct pcl_softc {
        !            86:        struct  ifnet sc_if;            /* network-visible interface */
        !            87:        struct  ifuba sc_ifuba;         /* UNIBUS resources */
        !            88:        short   sc_oactive;             /* is output active? */
        !            89:        short   sc_olen;                /* length of last output */
        !            90:        short   sc_lastdest;            /* previous destination */
        !            91:        short   sc_odest;               /* current xmit destination */
        !            92:        short   sc_bdest;               /* buffer's stated destination */
        !            93:        short   sc_pattern;             /* identification pattern */
        !            94: } pcl_softc[NPCL];
        !            95: 
        !            96: /*
        !            97:  * Structure of "local header", which only goes between
        !            98:  * pcloutput and pclstart.
        !            99:  */
        !           100: struct pcl_header {
        !           101:        short   pcl_dest;               /* Destination PCL station */
        !           102: };
        !           103: 
        !           104: /*
        !           105:  * Do non-DMA output of 1 word to determine presence of interface,
        !           106:  * and to find the interupt vector.  1 word messages are a special
        !           107:  * case in the receiver routine, and will be discarded.
        !           108:  */
        !           109: pclprobe(reg)
        !           110:        caddr_t reg;
        !           111: {
        !           112:        register int br, cvec;          /* r11, r10 value-result */
        !           113:        register struct pcldevice *addr = (struct pcldevice *)reg;
        !           114: 
        !           115: #ifdef lint
        !           116:        br = 0; cvec = br; br = cvec;
        !           117:        pclrint(0); pclxint(0);
        !           118: #endif
        !           119:        addr->pcl_rcr = PCL_RCINIT;
        !           120:        addr->pcl_tcr = PCL_TXINIT;
        !           121:        addr->pcl_tsba = 0xFFFE;
        !           122:        /* going for 01777776 */
        !           123:        addr->pcl_tsbc = -4;            /* really short */
        !           124:        addr->pcl_tcr =
        !           125:         ((1 & 0xF) << 8) | PCL_TXNPR | PCL_SNDWD | PCL_STTXM | PCL_IE | 0x0030;
        !           126:        DELAY(100000);
        !           127:        addr->pcl_tcr = PCL_TXINIT;
        !           128:        return (sizeof (struct pcldevice));
        !           129: }
        !           130: 
        !           131: /*
        !           132:  * Interface exists: make available by filling in network interface
        !           133:  * record.  System will initialize the interface when it is ready
        !           134:  * to accept packets.
        !           135:  */
        !           136: pclattach(ui)
        !           137:        struct uba_device *ui;
        !           138: {
        !           139:        register struct pcl_softc *sc = &pcl_softc[ui->ui_unit];
        !           140: 
        !           141:        sc->sc_if.if_unit = ui->ui_unit;
        !           142:        sc->sc_if.if_name = "pcl";
        !           143:        sc->sc_if.if_mtu = PCLMTU;
        !           144:        sc->sc_if.if_init = pclinit;
        !           145:        sc->sc_if.if_output = pcloutput;
        !           146:        sc->sc_if.if_ioctl = pclioctl;
        !           147:        sc->sc_if.if_reset = pclreset;
        !           148:        sc->sc_if.if_flags = IFF_BROADCAST;
        !           149:        sc->sc_ifuba.ifu_flags = UBA_NEEDBDP;
        !           150:        if_attach(&sc->sc_if);
        !           151: }
        !           152: 
        !           153: /*
        !           154:  * Reset of interface after UNIBUS reset.
        !           155:  * If interface is on specified uba, reset its state.
        !           156:  */
        !           157: pclreset(unit, uban)
        !           158:        int unit, uban;
        !           159: {
        !           160:        register struct uba_device *ui;
        !           161: 
        !           162:        if (unit >= NPCL || (ui = pclinfo[unit]) == 0 || ui->ui_alive == 0 ||
        !           163:            ui->ui_ubanum != uban)
        !           164:                return;
        !           165:        printf(" pcl%d", unit);
        !           166:        pclinit(unit);
        !           167: }
        !           168: 
        !           169: /*
        !           170:  * Initialization of interface; clear recorded pending
        !           171:  * operations, and reinitialize UNIBUS usage.
        !           172:  */
        !           173: pclinit(unit)
        !           174:        int unit;
        !           175: {
        !           176:        register struct pcl_softc *sc = &pcl_softc[unit];
        !           177:        register struct uba_device *ui = pclinfo[unit];
        !           178:        register struct pcldevice *addr;
        !           179:        int s;
        !           180: 
        !           181:        if (sc->sc_if.if_addrlist == (struct ifaddr *)0)
        !           182:                return;
        !           183:        if (if_ubainit(&sc->sc_ifuba, ui->ui_ubanum, 0,
        !           184:            (int)btoc(PCLMTU)) == 0) { 
        !           185:                printf("pcl%d: can't init\n", unit);
        !           186:                sc->sc_if.if_flags &= ~(IFF_UP | IFF_RUNNING);
        !           187:                return;
        !           188:        }
        !           189:        sc->sc_if.if_flags |= IFF_RUNNING;
        !           190:        addr = (struct pcldevice *)ui->ui_addr;
        !           191:        addr->pcl_rcr = PCL_RCINIT;
        !           192:        addr->pcl_tcr = PCL_TXINIT;
        !           193: 
        !           194:        /*
        !           195:         * Hang a receive and start any
        !           196:         * pending writes by faking a transmit complete.
        !           197:         */
        !           198:        s = splimp();
        !           199:        addr->pcl_rdba = (short) sc->sc_ifuba.ifu_r.ifrw_info;
        !           200:        addr->pcl_rdbc = -PCLMTU;
        !           201:        addr->pcl_rcr = (((int)(sc->sc_ifuba.ifu_r.ifrw_info>>12))&0x0030) |
        !           202:                PCL_RCNPR | PCL_RCVWD | PCL_RCVDAT | PCL_IE;
        !           203:        sc->sc_oactive = 0;
        !           204:        pclstart(unit);
        !           205:        splx(s);
        !           206: }
        !           207: 
        !           208: /*
        !           209:  * PCL output routine.
        !           210:  */
        !           211: pcloutput(ifp, m, dst)
        !           212:        struct ifnet *ifp;
        !           213:        struct mbuf *m;
        !           214:        struct sockaddr *dst;
        !           215: {
        !           216:        int dest, s, error;
        !           217:        struct pcl_header *pclp;
        !           218:        struct mbuf *m2;
        !           219: 
        !           220:        switch (dst->sa_family) {
        !           221: 
        !           222: #ifdef INET
        !           223:        case AF_INET:
        !           224:                if (in_broadcast(((struct sockaddr_in *)dst)->sin_addr))
        !           225:                        dest = 0;
        !           226:                else
        !           227:                        dest = in_lnaof(((struct sockaddr_in *)dst)->sin_addr);
        !           228:                if (dest > PCLMAXTDM) {
        !           229:                        error = EHOSTUNREACH;
        !           230:                        goto bad;
        !           231:                }
        !           232:                break;
        !           233: #endif
        !           234:        default:
        !           235:                printf("pcl%d: can't handle af%d\n", ifp->if_unit,
        !           236:                        dst->sa_family);
        !           237:                error = EAFNOSUPPORT;
        !           238:                goto bad;
        !           239:        }
        !           240: 
        !           241:        /*
        !           242:         * Add pseudo local net header.
        !           243:         * Actually, it does not get transmitted, but merely stripped
        !           244:         * off and used by the START routine to route the packet.
        !           245:         * If no space in first mbuf, allocate another.
        !           246:         */
        !           247:        M_PREPEND(m, sizeof(struct pcl_header), M_DONTWAIT);
        !           248:        if (m == 0) {
        !           249:                error = ENOBUFS;
        !           250:                goto bad;
        !           251:        }
        !           252:        pclp = mtod(m, struct pcl_header *);
        !           253:        pclp->pcl_dest = dest;
        !           254: 
        !           255:        /*
        !           256:         * Queue message on interface, and start output if interface
        !           257:         * not yet active.
        !           258:         */
        !           259:        s = splimp();
        !           260:        if (IF_QFULL(&ifp->if_snd)) {
        !           261:                IF_DROP(&ifp->if_snd);
        !           262:                error = ENOBUFS;
        !           263:                goto qfull;
        !           264:        }
        !           265:        IF_ENQUEUE(&ifp->if_snd, m);
        !           266:        if (pcl_softc[ifp->if_unit].sc_oactive == 0)
        !           267:                pclstart(ifp->if_unit);
        !           268:        splx(s);
        !           269:        return (0);
        !           270: qfull:
        !           271:        splx(s);
        !           272: bad:
        !           273:        m_freem(m);
        !           274:        return (error);
        !           275: }
        !           276: 
        !           277: /*
        !           278:  * Start or restart output on interface.
        !           279:  * If interface is already active, then this is a retransmit.
        !           280:  * If interface is not already active, get another datagram
        !           281:  * to send off of the interface queue, and map it to the interface
        !           282:  * before starting the output.
        !           283:  */
        !           284: pclstart(dev)
        !           285:        dev_t dev;
        !           286: {
        !           287:         int unit = PCLUNIT(dev);
        !           288:        struct uba_device *ui = pclinfo[unit];
        !           289:        register struct pcl_softc *sc = &pcl_softc[unit];
        !           290:        register struct pcldevice *addr;
        !           291:        struct mbuf *m;
        !           292: 
        !           293:        if (sc->sc_oactive)
        !           294:                goto restart;
        !           295: 
        !           296:        /*
        !           297:         * Not already active: dequeue another request
        !           298:         * and map it to the UNIBUS.  If no more requests,
        !           299:         * just return.
        !           300:         */
        !           301:        IF_DEQUEUE(&sc->sc_if.if_snd, m);
        !           302:        if (m == 0) {
        !           303:                sc->sc_oactive = 0;
        !           304:                return;
        !           305:        }
        !           306: 
        !           307:        /*
        !           308:         * Pull destination node out of pseudo-local net header.
        !           309:         * remove it from outbound data.
        !           310:         * Note that if_wubaput calls m_bcopy, which is prepared for
        !           311:         * m_len to be 0 in the first mbuf in the chain.
        !           312:         */
        !           313:        sc->sc_bdest = mtod(m, struct pcl_header *)->pcl_dest;
        !           314:        sc->sc_odest = sc->sc_bdest? sc->sc_bdest: 1;
        !           315:        m->m_data += sizeof (struct pcl_header);
        !           316:        m->m_len -= sizeof (struct pcl_header);
        !           317:        if (m->m_flags & M_PKTHDR)
        !           318:                m->m_pkthdr.len -= sizeof (struct pcl_header);
        !           319: 
        !           320:        /* Map out to the DMA area */
        !           321:        sc->sc_olen = if_wubaput(&sc->sc_ifuba, m);
        !           322: 
        !           323: restart:
        !           324:        /*
        !           325:         * Have request mapped to UNIBUS for transmission.
        !           326:         * Purge any stale data from this BDP, and start the output.
        !           327:         */
        !           328:        if (sc->sc_ifuba.ifu_flags & UBA_NEEDBDP)
        !           329:                UBAPURGE(sc->sc_ifuba.ifu_uba, sc->sc_ifuba.ifu_w.ifrw_bdp);
        !           330:        addr = (struct pcldevice *)ui->ui_addr;
        !           331:        addr->pcl_tcr = PCL_TXINIT;
        !           332:        addr->pcl_tsba = (int)sc->sc_ifuba.ifu_w.ifrw_info;
        !           333:        addr->pcl_tsbc = -sc->sc_olen;
        !           334: 
        !           335:        /*
        !           336:         * RIB (retry if busy) is used on the second and subsequent packets
        !           337:         * to a single host, because TCP often wants to transmit multiple
        !           338:         * buffers in a row,
        !           339:         * and if they are all going to the same place, the second and
        !           340:         * subsequent ones may be lost due to receiver not ready again yet.
        !           341:         * This can cause serious problems, because the TCP will resend the
        !           342:         * whole window, which just repeats the problem.  The result is that
        !           343:         * a perfectly good link appears not to work unless we take steps here.
        !           344:         */
        !           345:        addr->pcl_tcr = (((int)(sc->sc_ifuba.ifu_w.ifrw_info>>12))&0x0030) |
        !           346:                ((sc->sc_odest & 0xF)<<8) |
        !           347:                PCL_TXNPR | PCL_SNDWD | PCL_STTXM | PCL_IE |
        !           348:                (sc->sc_odest == sc->sc_lastdest ? PCL_RIB : 0);
        !           349:        sc->sc_lastdest = sc->sc_odest;
        !           350:        sc->sc_oactive = 1;
        !           351: }
        !           352: 
        !           353: /*
        !           354:  * PCL transmitter interrupt.
        !           355:  * Start another output if more data to send.
        !           356:  */
        !           357: pclxint(unit)
        !           358:        int unit;
        !           359: {
        !           360:        register struct uba_device *ui = pclinfo[unit];
        !           361:        register struct pcl_softc *sc = &pcl_softc[unit];
        !           362:        register struct pcldevice *addr = (struct pcldevice *)ui->ui_addr;
        !           363: 
        !           364:        if (sc->sc_oactive == 0) {
        !           365:                printf ("pcl%d: stray interrupt\n", unit);
        !           366:                return;
        !           367:        }
        !           368:        if (addr->pcl_tsr & PCL_ERR) {
        !           369:                sc->sc_lastdest = 0;            /* don't bother with RIB */
        !           370:                if (addr->pcl_tsr & PCL_MSTDWN) {
        !           371:                        addr->pcl_tmmr = PCL_MASTER|PCL_AUTOADDR;
        !           372:                        pclstart(unit); /* Retry */
        !           373:                        printf("pcl%d: master\n", unit );
        !           374:                        return;
        !           375:                }
        !           376: #ifndef PCL_TESTING
        !           377:                if ((addr->pcl_tsr & (PCL_ERR|PCL_RESPB)) == (PCL_ERR|0))  {
        !           378:                        ;       /* Receiver Offline -- not exactly an error */
        !           379:                }  else  {
        !           380: #else
        !           381:                {
        !           382: #endif
        !           383:                        /* Log as an error */
        !           384:                        printf("pcl%d: send error, tcr=%b tsr=%b\n",
        !           385:                                unit, addr->pcl_tcr, PCL_TCSRBITS,
        !           386:                                addr->pcl_tsr, PCL_TERRBITS);
        !           387:                        sc->sc_if.if_oerrors++;
        !           388:                }
        !           389:        } else
        !           390:                sc->sc_if.if_opackets++;
        !           391:        if (sc->sc_bdest == 0 && sc->sc_odest < PCLMAXTDM) {
        !           392:                sc->sc_odest++;         /* do next host (broadcast) */
        !           393:        } else {
        !           394:                sc->sc_oactive = 0;
        !           395:                if (sc->sc_ifuba.ifu_xtofree) {
        !           396:                        m_freem(sc->sc_ifuba.ifu_xtofree);
        !           397:                        sc->sc_ifuba.ifu_xtofree = 0;
        !           398:                }
        !           399:        }
        !           400:        pclstart(unit);
        !           401: }
        !           402: 
        !           403: /*
        !           404:  * PCL interface receiver interrupt.
        !           405:  * If input error just drop packet.
        !           406:  */
        !           407: pclrint(unit)
        !           408:        int unit;
        !           409: {
        !           410:        register struct pcl_softc *sc = &pcl_softc[unit];
        !           411:        struct pcldevice *addr = (struct pcldevice *)pclinfo[unit]->ui_addr;
        !           412:        struct mbuf *m;
        !           413:        int len;
        !           414:        register struct ifqueue *inq;
        !           415: 
        !           416:        sc->sc_if.if_ipackets++;
        !           417:        /*
        !           418:         * Purge BDP; drop if input error indicated.
        !           419:         */
        !           420:        if (sc->sc_ifuba.ifu_flags & UBA_NEEDBDP)
        !           421:                UBAPURGE(sc->sc_ifuba.ifu_uba, sc->sc_ifuba.ifu_r.ifrw_bdp);
        !           422:        if (addr->pcl_rsr & PCL_ERR) {
        !           423:                printf("pcl%d: rcv error, rcr=%b rsr=%b\n",
        !           424:                        unit, addr->pcl_rcr, PCL_RCSRBITS,
        !           425:                        addr->pcl_rsr, PCL_RERRBITS);
        !           426:                sc->sc_if.if_ierrors++;
        !           427:                goto setup;
        !           428:        }
        !           429:        len = PCLMTU + addr->pcl_rdbc;
        !           430:        if (len <= 0 || len > PCLMTU) {
        !           431:                printf("pcl%d: bad len=%d.\n", unit, len);
        !           432:                sc->sc_if.if_ierrors++;
        !           433:                goto setup;
        !           434:        }
        !           435: 
        !           436:        /* Really short packets will be part of the startup sequence */
        !           437:        if (len <= 4) {
        !           438:                /* Later, do comming-up processing here */
        !           439:                goto setup;     /* drop packet */
        !           440:        }
        !           441: 
        !           442:        /*
        !           443:         * Pull packet off interface.
        !           444:         */
        !           445:        m = if_rubaget(&sc->sc_ifuba, len, 0, &sc->sc_if);
        !           446:        if (m == 0)
        !           447:                goto setup;
        !           448: 
        !           449:        schednetisr(NETISR_IP);
        !           450:        inq = &ipintrq;
        !           451: 
        !           452:        if (IF_QFULL(inq)) {
        !           453:                IF_DROP(inq);
        !           454:                m_freem(m);
        !           455:        } else
        !           456:                IF_ENQUEUE(inq, m);
        !           457: setup:
        !           458:        /*
        !           459:         * Reset for next packet.
        !           460:         */
        !           461:        addr->pcl_rcr = PCL_RCINIT;
        !           462:        addr->pcl_rdba = (int)sc->sc_ifuba.ifu_r.ifrw_info;
        !           463:        addr->pcl_rdbc = -PCLMTU;
        !           464:        addr->pcl_rcr = (((int)(sc->sc_ifuba.ifu_w.ifrw_info>>12))&0x0030) |
        !           465:                PCL_RCNPR | PCL_RCVWD | PCL_RCVDAT | PCL_IE;
        !           466: }
        !           467: 
        !           468: /*
        !           469:  * Process an ioctl request.
        !           470:  */
        !           471: /* ARGSUSED */
        !           472: pclioctl(ifp, cmd, data)
        !           473:        register struct ifnet *ifp;
        !           474:        int cmd;
        !           475:        caddr_t data;
        !           476: {
        !           477:        int s = splimp(), error = 0;
        !           478: 
        !           479:        switch (cmd) {
        !           480: 
        !           481:        case SIOCSIFADDR:
        !           482:                ifp->if_flags |= IFF_UP;
        !           483:                if ((ifp->if_flags & IFF_RUNNING) == 0)
        !           484:                        pclinit(ifp->if_unit);
        !           485:                break;
        !           486: 
        !           487:        default:
        !           488:                error = EINVAL;
        !           489:        }
        !           490:        splx(s);
        !           491:        return (error);
        !           492: }
        !           493: #endif

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