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

1.1     ! root        1: /*     if_pcl.c        6.1     83/07/29        */
        !             2: 
        !             3: #include "pcl.h"
        !             4: #if NPCL > 0
        !             5: /*
        !             6:  * DEC CSS PCL-11B Parallel Communications Interface
        !             7:  *
        !             8:  * Written by Mike Muuss and Jeff Schwab.
        !             9:  */
        !            10: #include "../machine/pte.h"
        !            11: 
        !            12: #include "../h/param.h"
        !            13: #include "../h/systm.h"
        !            14: #include "../h/mbuf.h"
        !            15: #include "../h/buf.h"
        !            16: #include "../h/protosw.h"
        !            17: #include "../h/socket.h"
        !            18: #include "../h/vmmac.h"
        !            19: #include "../h/ioctl.h"
        !            20: #include "../h/errno.h"
        !            21: 
        !            22: #include "../net/if.h"
        !            23: #include "../net/netisr.h"
        !            24: #include "../net/route.h"
        !            25: #include "../netinet/in.h"
        !            26: #include "../netinet/in_systm.h"
        !            27: #include "../netinet/ip.h"
        !            28: #include "../netinet/ip_var.h"
        !            29: 
        !            30: #include "../vax/cpu.h"
        !            31: #include "../vax/mtpr.h"
        !            32: #include "../vaxif/if_pclreg.h"
        !            33: #include "../vaxif/if_uba.h"
        !            34: #include "../vaxuba/ubareg.h"
        !            35: #include "../vaxuba/ubavar.h"
        !            36: 
        !            37: /* The MTU has been carefully selected to prevent fragmentation <-> ArpaNet */
        !            38: #define        PCLMTU          (1006)  /* Max transmission unit (bytes) */
        !            39: #define        PCLMAXTDM       7       /* Max unit number on TDM bus */
        !            40: 
        !            41: int    pclprobe(), pclattach(), pclrint(), pclxint();
        !            42: int    pclinit(), pclioctl(), pcloutput(), pclreset();
        !            43: 
        !            44: struct uba_device      *pclinfo[NPCL];
        !            45: u_short pclstd[] = { 0 };
        !            46: #define        PCLUNIT(x)      minor(x)
        !            47: struct uba_driver pcldriver =
        !            48:        { pclprobe, 0, pclattach, 0, pclstd, "pcl", pclinfo };
        !            49: 
        !            50: /*
        !            51:  * PCL software status per interface.
        !            52:  *
        !            53:  * Each interface is referenced by a network interface structure,
        !            54:  * sc_if, which the routing code uses to locate the interface.
        !            55:  * This structure contains the output queue for the interface, its address, ...
        !            56:  * We also have, for each interface, a UBA interface structure, which
        !            57:  * contains information about the UNIBUS resources held by the interface:
        !            58:  * map registers, buffered data paths, etc.  Information is cached in this
        !            59:  * structure for use by the if_uba.c routines in running the interface
        !            60:  * efficiently.
        !            61:  */
        !            62: struct pcl_softc {
        !            63:        struct  ifnet sc_if;            /* network-visible interface */
        !            64:        struct  ifuba sc_ifuba;         /* UNIBUS resources */
        !            65:        short   sc_oactive;             /* is output active? */
        !            66:        short   sc_olen;                /* length of last output */
        !            67:        short   sc_lastdest;            /* previous destination */
        !            68:        short   sc_odest;               /* current xmit destination */
        !            69:        short   sc_bdest;               /* buffer's stated destination */
        !            70:        short   sc_pattern;             /* identification pattern */
        !            71: } pcl_softc[NPCL];
        !            72: 
        !            73: /*
        !            74:  * Structure of "local header", which only goes between
        !            75:  * pcloutput and pclstart.
        !            76:  */
        !            77: struct pcl_header {
        !            78:        short   pcl_dest;               /* Destination PCL station */
        !            79: };
        !            80: 
        !            81: /*
        !            82:  * Do non-DMA output of 1 word to determine presence of interface,
        !            83:  * and to find the interupt vector.  1 word messages are a special
        !            84:  * case in the receiver routine, and will be discarded.
        !            85:  */
        !            86: pclprobe(reg)
        !            87:        caddr_t reg;
        !            88: {
        !            89:        register int br, cvec;          /* r11, r10 value-result */
        !            90:        register struct pcldevice *addr = (struct pcldevice *)reg;
        !            91: 
        !            92: #ifdef lint
        !            93:        br = 0; cvec = br; br = cvec;
        !            94:        pclrint(0); pclxint(0);
        !            95: #endif
        !            96:        addr->pcl_rcr = PCL_RCINIT;
        !            97:        addr->pcl_tcr = PCL_TXINIT;
        !            98:        addr->pcl_tsba = 0xFFFE;
        !            99:        /* going for 01777776 */
        !           100:        addr->pcl_tsbc = -4;            /* really short */
        !           101:        addr->pcl_tcr =
        !           102:         ((1 & 0xF) << 8) | PCL_TXNPR | PCL_SNDWD | PCL_STTXM | PCL_IE | 0x0030;
        !           103:        DELAY(100000);
        !           104:        addr->pcl_tcr = PCL_TXINIT;
        !           105:        return (sizeof (struct pcldevice));
        !           106: }
        !           107: 
        !           108: /*
        !           109:  * Interface exists: make available by filling in network interface
        !           110:  * record.  System will initialize the interface when it is ready
        !           111:  * to accept packets.
        !           112:  */
        !           113: pclattach(ui)
        !           114:        struct uba_device *ui;
        !           115: {
        !           116:        register struct pcl_softc *sc = &pcl_softc[ui->ui_unit];
        !           117: 
        !           118:        sc->sc_if.if_unit = ui->ui_unit;
        !           119:        sc->sc_if.if_name = "pcl";
        !           120:        sc->sc_if.if_mtu = PCLMTU;
        !           121:        sc->sc_if.if_init = pclinit;
        !           122:        sc->sc_if.if_output = pcloutput;
        !           123:        sc->sc_if.if_ioctl = pclioctl;
        !           124:        sc->sc_if.if_reset = pclreset;
        !           125:        sc->sc_ifuba.ifu_flags = UBA_NEEDBDP;
        !           126:        if_attach(&sc->sc_if);
        !           127: }
        !           128: 
        !           129: /*
        !           130:  * Reset of interface after UNIBUS reset.
        !           131:  * If interface is on specified uba, reset its state.
        !           132:  */
        !           133: pclreset(unit, uban)
        !           134:        int unit, uban;
        !           135: {
        !           136:        register struct uba_device *ui;
        !           137: 
        !           138:        if (unit >= NPCL || (ui = pclinfo[unit]) == 0 || ui->ui_alive == 0 ||
        !           139:            ui->ui_ubanum != uban)
        !           140:                return;
        !           141:        printf(" pcl%d", unit);
        !           142:        pclinit(unit);
        !           143: }
        !           144: 
        !           145: /*
        !           146:  * Initialization of interface; clear recorded pending
        !           147:  * operations, and reinitialize UNIBUS usage.
        !           148:  */
        !           149: pclinit(unit)
        !           150:        int unit;
        !           151: {
        !           152:        register struct pcl_softc *sc = &pcl_softc[unit];
        !           153:        register struct uba_device *ui = pclinfo[unit];
        !           154:        register struct pcldevice *addr;
        !           155:        struct sockaddr_in *sin;
        !           156:        int s;
        !           157: 
        !           158:        sin = (struct sockaddr_in *)&sc->sc_if.if_addr;
        !           159:        if (sin->sin_addr.s_addr == 0)
        !           160:                return;
        !           161:        if (if_ubainit(&sc->sc_ifuba, ui->ui_ubanum, 0,
        !           162:            (int)btoc(PCLMTU)) == 0) { 
        !           163:                printf("pcl%d: can't init\n", unit);
        !           164:                sc->sc_if.if_flags &= ~IFF_UP;
        !           165:                return;
        !           166:        }
        !           167:        addr = (struct pcldevice *)ui->ui_addr;
        !           168:        addr->pcl_rcr = PCL_RCINIT;
        !           169:        addr->pcl_tcr = PCL_TXINIT;
        !           170: 
        !           171:        /*
        !           172:         * Hang a receive and start any
        !           173:         * pending writes by faking a transmit complete.
        !           174:         */
        !           175:        s = splimp();
        !           176:        addr->pcl_rdba = (short) sc->sc_ifuba.ifu_r.ifrw_info;
        !           177:        addr->pcl_rdbc = -PCLMTU;
        !           178:        addr->pcl_rcr = (((int)(sc->sc_ifuba.ifu_r.ifrw_info>>12))&0x0030) |
        !           179:                PCL_RCNPR | PCL_RCVWD | PCL_RCVDAT | PCL_IE;
        !           180:        sc->sc_oactive = 0;
        !           181:        sc->sc_if.if_flags |= IFF_UP|IFF_RUNNING;
        !           182:        pclstart(unit);
        !           183:        splx(s);
        !           184:        /* Set up routing table entry */
        !           185:        if_rtinit(&sc->sc_if, RTF_UP);
        !           186: }
        !           187: 
        !           188: /*
        !           189:  * PCL output routine.
        !           190:  */
        !           191: pcloutput(ifp, m, dst)
        !           192:        struct ifnet *ifp;
        !           193:        struct mbuf *m;
        !           194:        struct sockaddr *dst;
        !           195: {
        !           196:        int dest, s, error;
        !           197:        struct pcl_header *pclp;
        !           198:        struct mbuf *m2;
        !           199: 
        !           200:        switch (dst->sa_family) {
        !           201: 
        !           202: #ifdef INET
        !           203:        case AF_INET:
        !           204:                dest = in_lnaof(((struct sockaddr_in *)dst)->sin_addr);
        !           205:                if (dest > PCLMAXTDM) {
        !           206:                        error = EHOSTUNREACH;
        !           207:                        goto bad;
        !           208:                }
        !           209:                break;
        !           210: #endif
        !           211:        default:
        !           212:                printf("pcl%d: can't handle af%d\n", ifp->if_unit,
        !           213:                        dst->sa_family);
        !           214:                error = EAFNOSUPPORT;
        !           215:                goto bad;
        !           216:        }
        !           217: 
        !           218:        /*
        !           219:         * Add pseudo local net header.
        !           220:         * Actually, it does not get transmitted, but merely stripped
        !           221:         * off and used by the START routine to route the packet.
        !           222:         * If no space in first mbuf, allocate another.
        !           223:         */
        !           224:        if (m->m_off > MMAXOFF ||
        !           225:            MMINOFF + sizeof (struct pcl_header) > m->m_off) {
        !           226:                m2 = m_get(M_DONTWAIT, MT_HEADER);
        !           227:                if (m2 == 0) {
        !           228:                        error = ENOBUFS;
        !           229:                        goto bad;
        !           230:                }
        !           231:                m2->m_next = m;
        !           232:                m2->m_off = MMINOFF;
        !           233:                m2->m_len = sizeof (struct pcl_header);
        !           234:                m = m2;
        !           235:        } else {
        !           236:                m->m_off -= sizeof (struct pcl_header);
        !           237:                m->m_len += sizeof (struct pcl_header);
        !           238:        }
        !           239:        pclp = mtod(m, struct pcl_header *);
        !           240:        pclp->pcl_dest = dest;
        !           241: 
        !           242:        /*
        !           243:         * Queue message on interface, and start output if interface
        !           244:         * not yet active.
        !           245:         */
        !           246:        s = splimp();
        !           247:        if (IF_QFULL(&ifp->if_snd)) {
        !           248:                IF_DROP(&ifp->if_snd);
        !           249:                error = ENOBUFS;
        !           250:                goto qfull;
        !           251:        }
        !           252:        IF_ENQUEUE(&ifp->if_snd, m);
        !           253:        if (pcl_softc[ifp->if_unit].sc_oactive == 0)
        !           254:                pclstart(ifp->if_unit);
        !           255:        splx(s);
        !           256:        return (0);
        !           257: qfull:
        !           258:        splx(s);
        !           259: bad:
        !           260:        m_freem(m);
        !           261:        return (error);
        !           262: }
        !           263: 
        !           264: /*
        !           265:  * Start or restart output on interface.
        !           266:  * If interface is already active, then this is a retransmit.
        !           267:  * If interface is not already active, get another datagram
        !           268:  * to send off of the interface queue, and map it to the interface
        !           269:  * before starting the output.
        !           270:  */
        !           271: pclstart(dev)
        !           272:        dev_t dev;
        !           273: {
        !           274:         int unit = PCLUNIT(dev);
        !           275:        struct uba_device *ui = pclinfo[unit];
        !           276:        register struct pcl_softc *sc = &pcl_softc[unit];
        !           277:        register struct pcldevice *addr;
        !           278:        struct mbuf *m;
        !           279: 
        !           280:        if (sc->sc_oactive)
        !           281:                goto restart;
        !           282: 
        !           283:        /*
        !           284:         * Not already active: dequeue another request
        !           285:         * and map it to the UNIBUS.  If no more requests,
        !           286:         * just return.
        !           287:         */
        !           288:        IF_DEQUEUE(&sc->sc_if.if_snd, m);
        !           289:        if (m == 0) {
        !           290:                sc->sc_oactive = 0;
        !           291:                return;
        !           292:        }
        !           293: 
        !           294:        /*
        !           295:         * Pull destination node out of pseudo-local net header.
        !           296:         * remove it from outbound data.
        !           297:         * Note that if_wubaput calls m_bcopy, which is prepared for
        !           298:         * m_len to be 0 in the first mbuf in the chain.
        !           299:         */
        !           300:        sc->sc_bdest = mtod(m, struct pcl_header *)->pcl_dest;
        !           301:        sc->sc_odest = sc->sc_bdest? sc->sc_bdest: 1;
        !           302:        m->m_off += sizeof (struct pcl_header);
        !           303:        m->m_len -= sizeof (struct pcl_header);
        !           304: 
        !           305:        /* Map out to the DMA area */
        !           306:        sc->sc_olen = if_wubaput(&sc->sc_ifuba, m);
        !           307: 
        !           308: restart:
        !           309:        /*
        !           310:         * Have request mapped to UNIBUS for transmission.
        !           311:         * Purge any stale data from this BDP, and start the output.
        !           312:         */
        !           313:        if (sc->sc_ifuba.ifu_flags & UBA_NEEDBDP)
        !           314:                UBAPURGE(sc->sc_ifuba.ifu_uba, sc->sc_ifuba.ifu_w.ifrw_bdp);
        !           315:        addr = (struct pcldevice *)ui->ui_addr;
        !           316:        addr->pcl_tcr = PCL_TXINIT;
        !           317:        addr->pcl_tsba = (int)sc->sc_ifuba.ifu_w.ifrw_info;
        !           318:        addr->pcl_tsbc = -sc->sc_olen;
        !           319: 
        !           320:        /*
        !           321:         * RIB (retry if busy) is used on the second and subsequent packets
        !           322:         * to a single host, because TCP often wants to transmit multiple
        !           323:         * buffers in a row,
        !           324:         * and if they are all going to the same place, the second and
        !           325:         * subsequent ones may be lost due to receiver not ready again yet.
        !           326:         * This can cause serious problems, because the TCP will resend the
        !           327:         * whole window, which just repeats the problem.  The result is that
        !           328:         * a perfectly good link appears not to work unless we take steps here.
        !           329:         */
        !           330:        addr->pcl_tcr = (((int)(sc->sc_ifuba.ifu_w.ifrw_info>>12))&0x0030) |
        !           331:                ((sc->sc_odest & 0xF)<<8) |
        !           332:                PCL_TXNPR | PCL_SNDWD | PCL_STTXM | PCL_IE |
        !           333:                (sc->sc_odest == sc->sc_lastdest ? PCL_RIB : 0);
        !           334:        sc->sc_lastdest = sc->sc_odest;
        !           335:        sc->sc_oactive = 1;
        !           336: }
        !           337: 
        !           338: /*
        !           339:  * PCL transmitter interrupt.
        !           340:  * Start another output if more data to send.
        !           341:  */
        !           342: pclxint(unit)
        !           343:        int unit;
        !           344: {
        !           345:        register struct uba_device *ui = pclinfo[unit];
        !           346:        register struct pcl_softc *sc = &pcl_softc[unit];
        !           347:        register struct pcldevice *addr = (struct pcldevice *)ui->ui_addr;
        !           348: 
        !           349:        if (sc->sc_oactive == 0) {
        !           350:                printf ("pcl%d: stray interrupt\n", unit);
        !           351:                return;
        !           352:        }
        !           353:        if (addr->pcl_tsr & PCL_ERR) {
        !           354:                sc->sc_lastdest = 0;            /* don't bother with RIB */
        !           355:                if (addr->pcl_tsr & PCL_MSTDWN) {
        !           356:                        addr->pcl_tmmr = PCL_MASTER|PCL_AUTOADDR;
        !           357:                        pclstart(unit); /* Retry */
        !           358:                        printf("pcl%d: master\n", unit );
        !           359:                        return;
        !           360:                }
        !           361: #ifndef PCL_TESTING
        !           362:                if ((addr->pcl_tsr & (PCL_ERR|PCL_RESPB)) == (PCL_ERR|0))  {
        !           363:                        ;       /* Receiver Offline -- not exactly an error */
        !           364:                }  else  {
        !           365: #else
        !           366:                {
        !           367: #endif
        !           368:                        /* Log as an error */
        !           369:                        printf("pcl%d: send error, tcr=%b tsr=%b\n",
        !           370:                                unit, addr->pcl_tcr, PCL_TCSRBITS,
        !           371:                                addr->pcl_tsr, PCL_TERRBITS);
        !           372:                        sc->sc_if.if_oerrors++;
        !           373:                }
        !           374:        } else
        !           375:                sc->sc_if.if_opackets++;
        !           376:        if (sc->sc_bdest == 0 && sc->sc_odest < PCLMAXTDM) {
        !           377:                sc->sc_odest++;         /* do next host (broadcast) */
        !           378:        } else {
        !           379:                sc->sc_oactive = 0;
        !           380:                if (sc->sc_ifuba.ifu_xtofree) {
        !           381:                        m_freem(sc->sc_ifuba.ifu_xtofree);
        !           382:                        sc->sc_ifuba.ifu_xtofree = 0;
        !           383:                }
        !           384:        }
        !           385:        pclstart(unit);
        !           386: }
        !           387: 
        !           388: /*
        !           389:  * PCL interface receiver interrupt.
        !           390:  * If input error just drop packet.
        !           391:  */
        !           392: pclrint(unit)
        !           393:        int unit;
        !           394: {
        !           395:        register struct pcl_softc *sc = &pcl_softc[unit];
        !           396:        struct pcldevice *addr = (struct pcldevice *)pclinfo[unit]->ui_addr;
        !           397:        struct mbuf *m;
        !           398:        int len;
        !           399:        register struct ifqueue *inq;
        !           400: 
        !           401:        sc->sc_if.if_ipackets++;
        !           402:        /*
        !           403:         * Purge BDP; drop if input error indicated.
        !           404:         */
        !           405:        if (sc->sc_ifuba.ifu_flags & UBA_NEEDBDP)
        !           406:                UBAPURGE(sc->sc_ifuba.ifu_uba, sc->sc_ifuba.ifu_r.ifrw_bdp);
        !           407:        if (addr->pcl_rsr & PCL_ERR) {
        !           408:                printf("pcl%d: rcv error, rcr=%b rsr=%b\n",
        !           409:                        unit, addr->pcl_rcr, PCL_RCSRBITS,
        !           410:                        addr->pcl_rsr, PCL_RERRBITS);
        !           411:                sc->sc_if.if_ierrors++;
        !           412:                goto setup;
        !           413:        }
        !           414:        len = PCLMTU + addr->pcl_rdbc;
        !           415:        if (len <= 0 || len > PCLMTU) {
        !           416:                printf("pcl%d: bad len=%d.\n", unit, len);
        !           417:                sc->sc_if.if_ierrors++;
        !           418:                goto setup;
        !           419:        }
        !           420: 
        !           421:        /* Really short packets will be part of the startup sequence */
        !           422:        if (len <= 4) {
        !           423:                /* Later, do comming-up processing here */
        !           424:                goto setup;     /* drop packet */
        !           425:        }
        !           426: 
        !           427:        /*
        !           428:         * Pull packet off interface.
        !           429:         */
        !           430:        m = if_rubaget(&sc->sc_ifuba, len, 0);
        !           431:        if (m == 0)
        !           432:                goto setup;
        !           433: 
        !           434:        schednetisr(NETISR_IP);
        !           435:        inq = &ipintrq;
        !           436: 
        !           437:        if (IF_QFULL(inq)) {
        !           438:                IF_DROP(inq);
        !           439:                m_freem(m);
        !           440:        } else
        !           441:                IF_ENQUEUE(inq, m);
        !           442: setup:
        !           443:        /*
        !           444:         * Reset for next packet.
        !           445:         */
        !           446:        addr->pcl_rcr = PCL_RCINIT;
        !           447:        addr->pcl_rdba = (int)sc->sc_ifuba.ifu_r.ifrw_info;
        !           448:        addr->pcl_rdbc = -PCLMTU;
        !           449:        addr->pcl_rcr = (((int)(sc->sc_ifuba.ifu_w.ifrw_info>>12))&0x0030) |
        !           450:                PCL_RCNPR | PCL_RCVWD | PCL_RCVDAT | PCL_IE;
        !           451: }
        !           452: 
        !           453: /*
        !           454:  * Process an ioctl request.
        !           455:  */
        !           456: pclioctl(ifp, cmd, data)
        !           457:        register struct ifnet *ifp;
        !           458:        int cmd;
        !           459:        caddr_t data;
        !           460: {
        !           461:        struct ifreq *ifr = (struct ifreq *)data;
        !           462:        struct sockaddr_in *sin;
        !           463:        int s = splimp(), error = 0;
        !           464: 
        !           465:        switch (cmd) {
        !           466: 
        !           467:        case SIOCSIFADDR:
        !           468:                if (ifp->if_flags & IFF_RUNNING)
        !           469:                        if_rtinit(ifp, -1);     /* delete previous route */
        !           470:                sin = (struct sockaddr_in *)&ifr->ifr_addr;
        !           471:                ifp->if_addr = *(struct sockaddr *)sin;
        !           472:                ifp->if_net = in_netof(sin->sin_addr);
        !           473:                ifp->if_host[0] = in_lnaof(sin->sin_addr);
        !           474:                ifp->if_broadaddr = *(struct sockaddr *)sin;
        !           475:                sin = (struct sockaddr_in *)&ifp->if_broadaddr;
        !           476:                sin->sin_addr = if_makeaddr(ifp->if_net, INADDR_ANY);
        !           477:                ifp->if_flags |= IFF_BROADCAST;
        !           478:                if (ifp->if_flags & IFF_RUNNING)
        !           479:                        if_rtinit(ifp, RTF_UP);
        !           480:                else
        !           481:                        pclinit(ifp->if_unit);
        !           482:                break;
        !           483: 
        !           484:        default:
        !           485:                error = EINVAL;
        !           486:        }
        !           487:        splx(s);
        !           488:        return (error);
        !           489: }
        !           490: #endif

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