if_plip.c revision 38061 
1/*-
2 * Copyright (c) 1997 Poul-Henning Kamp
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 *
26 *	From Id: lpt.c,v 1.55.2.1 1996/11/12 09:08:38 phk Exp
27 *	$Id$
28 */
29
30/*
31 * Parallel port TCP/IP interfaces added.  I looked at the driver from
32 * MACH but this is a complete rewrite, and btw. incompatible, and it
33 * should perform better too.  I have never run the MACH driver though.
34 *
35 * This driver sends two bytes (0x08, 0x00) in front of each packet,
36 * to allow us to distinguish another format later.
37 *
38 * Now added an Linux/Crynwr compatibility mode which is enabled using
39 * IF_LINK0 - Tim Wilkinson.
40 *
41 * TODO:
42 *    Make HDLC/PPP mode, use IF_LLC1 to enable.
43 *
44 * Connect the two computers using a Laplink parallel cable to use this
45 * feature:
46 *
47 *      +----------------------------------------+
48 * 	|A-name	A-End	B-End	Descr.	Port/Bit |
49 *      +----------------------------------------+
50 *	|DATA0	2	15	Data	0/0x01   |
51 *	|-ERROR	15	2	   	1/0x08   |
52 *      +----------------------------------------+
53 *	|DATA1	3	13	Data	0/0x02	 |
54 *	|+SLCT	13	3	   	1/0x10   |
55 *      +----------------------------------------+
56 *	|DATA2	4	12	Data	0/0x04   |
57 *	|+PE	12	4	   	1/0x20   |
58 *      +----------------------------------------+
59 *	|DATA3	5	10	Strobe	0/0x08   |
60 *	|-ACK	10	5	   	1/0x40   |
61 *      +----------------------------------------+
62 *	|DATA4	6	11	Data	0/0x10   |
63 *	|BUSY	11	6	   	1/~0x80  |
64 *      +----------------------------------------+
65 *	|GND	18-25	18-25	GND	-        |
66 *      +----------------------------------------+
67 *
68 * Expect transfer-rates up to 75 kbyte/sec.
69 *
70 * If GCC could correctly grok
71 *	register int port asm("edx")
72 * the code would be cleaner
73 *
74 * Poul-Henning Kamp <phk@freebsd.org>
75 */
76
77/*
78 * Update for ppbus, PLIP support only - Nicolas Souchu
79 */
80
81#ifdef KERNEL
82#include <sys/param.h>
83#include <sys/systm.h>
84#include <sys/proc.h>
85#include <sys/mbuf.h>
86#include <sys/socket.h>
87#include <sys/filio.h>
88#include <sys/sockio.h>
89#include <sys/kernel.h>
90#include <sys/time.h>
91#include <sys/malloc.h>
92
93#include <net/if.h>
94#include <net/if_types.h>
95#include <net/netisr.h>
96
97#endif /* KERNEL */
98#include <sys/mbuf.h>
99#include <sys/socket.h>
100#include <net/netisr.h>
101#include <net/route.h>
102#include <netinet/in.h>
103#include <netinet/in_systm.h>
104#include <netinet/in_var.h>
105#include <netinet/ip.h>
106#include <netinet/if_ether.h>
107
108#include "bpfilter.h"
109#if NBPFILTER > 0
110#include <net/bpf.h>
111#include <net/bpfdesc.h>
112#endif
113
114#include <dev/ppbus/ppbconf.h>
115#include <dev/ppbus/nlpt.h>
116
117#ifndef LPMTU			/* MTU for the lp# interfaces */
118#define	LPMTU	1500
119#endif
120
121#ifndef LPMAXSPIN1		/* DELAY factor for the lp# interfaces */
122#define	LPMAXSPIN1	8000   /* Spinning for remote intr to happen */
123#endif
124
125#ifndef LPMAXSPIN2		/* DELAY factor for the lp# interfaces */
126#define	LPMAXSPIN2	500	/* Spinning for remote handshake to happen */
127#endif
128
129#ifndef LPMAXERRS		/* Max errors before !RUNNING */
130#define	LPMAXERRS	100
131#endif
132
133#define CLPIPHDRLEN	14	/* We send dummy ethernet addresses (two) + packet type in front of packet */
134#define	CLPIP_SHAKE	0x80	/* This bit toggles between nibble reception */
135#define MLPIPHDRLEN	CLPIPHDRLEN
136
137#define LPIPHDRLEN	2	/* We send 0x08, 0x00 in front of packet */
138#define	LPIP_SHAKE	0x40	/* This bit toggles between nibble reception */
139#if !defined(MLPIPHDRLEN) || LPIPHDRLEN > MLPIPHDRLEN
140#define MLPIPHDRLEN	LPIPHDRLEN
141#endif
142
143#define	LPIPTBLSIZE	256	/* Size of octet translation table */
144
145#define DEBUG
146
147#ifndef DEBUG
148#define lprintf (void)
149#else
150#define lprintf		if (lptflag) printf
151static int volatile lptflag = 1;
152#endif
153
154struct lpt_softc {
155	unsigned short lp_unit;
156
157	struct ppb_device lp_dev;
158
159	struct  ifnet	sc_if;
160	u_char		*sc_ifbuf;
161	int		sc_iferrs;
162};
163
164static int	nlp = 0;
165#define MAXPLIP	8			/* XXX not much better! */
166static struct lpt_softc *lpdata[MAXPLIP];
167
168
169/* Tables for the lp# interface */
170static u_char *txmith;
171#define txmitl (txmith+(1*LPIPTBLSIZE))
172#define trecvh (txmith+(2*LPIPTBLSIZE))
173#define trecvl (txmith+(3*LPIPTBLSIZE))
174
175static u_char *ctxmith;
176#define ctxmitl (ctxmith+(1*LPIPTBLSIZE))
177#define ctrecvh (ctxmith+(2*LPIPTBLSIZE))
178#define ctrecvl (ctxmith+(3*LPIPTBLSIZE))
179
180/* Functions for the lp# interface */
181static struct ppb_device	*lpprobe(struct ppb_data *);
182static int			lpattach(struct ppb_device *);
183
184static int lpinittables(void);
185static int lpioctl(struct ifnet *, u_long, caddr_t);
186static int lpoutput(struct ifnet *, struct mbuf *, struct sockaddr *,
187	struct rtentry *);
188static void lpintr(int);
189
190/*
191 * Make ourselves visible as a ppbus driver
192 */
193
194static struct ppb_driver lpdriver = {
195    lpprobe, lpattach, "lp"
196};
197DATA_SET(ppbdriver_set, lpdriver);
198
199
200/*
201 * lpprobe()
202 */
203static struct ppb_device *
204lpprobe(struct ppb_data *ppb)
205{
206	struct lpt_softc *lp;
207
208	/* if we haven't interrupts, the probe fails */
209	if (!ppb->ppb_link->id_irq)
210		return (0);
211
212	lp = (struct lpt_softc *) malloc(sizeof(struct lpt_softc),
213							M_TEMP, M_NOWAIT);
214	if (!lp) {
215		printf("lp: cannot malloc!\n");
216		return (0);
217	}
218	bzero(lp, sizeof(struct lpt_softc));
219
220	lpdata[nlp] = lp;
221
222	/*
223	 * lp dependent initialisation.
224	 */
225	lp->lp_unit = nlp;
226
227	if (bootverbose)
228		printf("plip: irq %d", ppb->ppb_link->id_irq);
229
230	/*
231	 * ppbus dependent initialisation.
232	 */
233	lp->lp_dev.id_unit = lp->lp_unit;
234	lp->lp_dev.name = lpdriver.name;
235	lp->lp_dev.ppb = ppb;
236	lp->lp_dev.intr = lpintr;
237
238	/* Ok, go to next device on next probe */
239	nlp ++;
240
241	return (&lp->lp_dev);
242}
243
244static int
245lpattach (struct ppb_device *dev)
246{
247	int unit = dev->id_unit;
248	struct lpt_softc *sc = lpdata[unit];
249	struct ifnet *ifp = &sc->sc_if;
250
251	/*
252	 * Report ourselves
253	 */
254	printf("plip%d: <PLIP network interface> on ppbus %d\n",
255	       dev->id_unit, dev->ppb->ppb_link->adapter_unit);
256
257	ifp->if_softc = sc;
258	ifp->if_name = "lp";
259	ifp->if_unit = unit;
260	ifp->if_mtu = LPMTU;
261	ifp->if_flags = IFF_SIMPLEX | IFF_POINTOPOINT | IFF_MULTICAST;
262	ifp->if_ioctl = lpioctl;
263	ifp->if_output = lpoutput;
264	ifp->if_type = IFT_PARA;
265	ifp->if_hdrlen = 0;
266	ifp->if_addrlen = 0;
267	ifp->if_snd.ifq_maxlen = IFQ_MAXLEN;
268	if_attach(ifp);
269
270#if NBPFILTER > 0
271	bpfattach(ifp, DLT_NULL, LPIPHDRLEN);
272#endif
273
274	return (1);
275}
276/*
277 * Build the translation tables for the LPIP (BSD unix) protocol.
278 * We don't want to calculate these nasties in our tight loop, so we
279 * precalculate them when we initialize.
280 */
281static int
282lpinittables (void)
283{
284    int i;
285
286    if (!txmith)
287	txmith = malloc(4*LPIPTBLSIZE, M_DEVBUF, M_NOWAIT);
288
289    if (!txmith)
290	return 1;
291
292    if (!ctxmith)
293	ctxmith = malloc(4*LPIPTBLSIZE, M_DEVBUF, M_NOWAIT);
294
295    if (!ctxmith)
296	return 1;
297
298    for (i=0; i < LPIPTBLSIZE; i++) {
299	ctxmith[i] = (i & 0xF0) >> 4;
300	ctxmitl[i] = 0x10 | (i & 0x0F);
301	ctrecvh[i] = (i & 0x78) << 1;
302	ctrecvl[i] = (i & 0x78) >> 3;
303    }
304
305    for (i=0; i < LPIPTBLSIZE; i++) {
306	txmith[i] = ((i & 0x80) >> 3) | ((i & 0x70) >> 4) | 0x08;
307	txmitl[i] = ((i & 0x08) << 1) | (i & 0x07);
308	trecvh[i] = ((~i) & 0x80) | ((i & 0x38) << 1);
309	trecvl[i] = (((~i) & 0x80) >> 4) | ((i & 0x38) >> 3);
310    }
311
312    return 0;
313}
314
315/*
316 * Process an ioctl request.
317 */
318
319static int
320lpioctl (struct ifnet *ifp, u_long cmd, caddr_t data)
321{
322    struct lpt_softc *sc = lpdata[ifp->if_unit];
323    struct ifaddr *ifa = (struct ifaddr *)data;
324    struct ifreq *ifr = (struct ifreq *)data;
325    u_char *ptr;
326    int error;
327
328    switch (cmd) {
329
330    case SIOCSIFDSTADDR:
331    case SIOCAIFADDR:
332    case SIOCSIFADDR:
333	if (ifa->ifa_addr->sa_family != AF_INET)
334	    return EAFNOSUPPORT;
335
336	ifp->if_flags |= IFF_UP;
337	/* FALLTHROUGH */
338    case SIOCSIFFLAGS:
339	if ((!(ifp->if_flags & IFF_UP)) && (ifp->if_flags & IFF_RUNNING)) {
340
341	    ppb_wctr(&sc->lp_dev, 0x00);
342	    ifp->if_flags &= ~IFF_RUNNING;
343
344	    /* IFF_UP is not set, try to release the bus anyway */
345	    ppb_release_bus(&sc->lp_dev);
346	    break;
347	}
348	if (((ifp->if_flags & IFF_UP)) && (!(ifp->if_flags & IFF_RUNNING))) {
349
350	    /*
351	     * Try to allocate the ppbus as soon as possible
352	     * With ppbus allocation, interrupts are enabled
353	     * Now IFF_UP means that we own the bus
354	     *
355	     * XXX
356	     * Should the request be interruptible?
357	     */
358	    if ((error = ppb_request_bus(&sc->lp_dev, PPB_WAIT|PPB_INTR)))
359		return (error);
360
361	    if (lpinittables()) {
362		ppb_release_bus(&sc->lp_dev);
363		return ENOBUFS;
364	    }
365
366	    sc->sc_ifbuf = malloc(sc->sc_if.if_mtu + MLPIPHDRLEN,
367				  M_DEVBUF, M_WAITOK);
368	    if (!sc->sc_ifbuf) {
369		ppb_release_bus(&sc->lp_dev);
370		return ENOBUFS;
371	    }
372
373	    ppb_wctr(&sc->lp_dev, LPC_ENA);
374	    ifp->if_flags |= IFF_RUNNING;
375	}
376	break;
377
378    case SIOCSIFMTU:
379	ptr = sc->sc_ifbuf;
380	sc->sc_ifbuf = malloc(ifr->ifr_mtu+MLPIPHDRLEN, M_DEVBUF, M_NOWAIT);
381	if (!sc->sc_ifbuf) {
382	    sc->sc_ifbuf = ptr;
383	    return ENOBUFS;
384	}
385	if (ptr)
386	    free(ptr,M_DEVBUF);
387	sc->sc_if.if_mtu = ifr->ifr_mtu;
388	break;
389
390    case SIOCGIFMTU:
391	ifr->ifr_mtu = sc->sc_if.if_mtu;
392	break;
393
394    case SIOCADDMULTI:
395    case SIOCDELMULTI:
396	if (ifr == 0) {
397	    return EAFNOSUPPORT;		/* XXX */
398	}
399	switch (ifr->ifr_addr.sa_family) {
400
401	case AF_INET:
402	    break;
403
404	default:
405	    return EAFNOSUPPORT;
406	}
407	break;
408
409    default:
410	lprintf("LP:ioctl(0x%x)\n",cmd);
411	return EINVAL;
412    }
413    return 0;
414}
415
416static __inline int
417clpoutbyte (u_char byte, int spin, struct ppb_device *dev)
418{
419	ppb_wdtr(dev, ctxmitl[byte]);
420	while (ppb_rstr(dev) & CLPIP_SHAKE)
421		if (--spin == 0) {
422			return 1;
423		}
424	ppb_wdtr(dev, ctxmith[byte]);
425	while (!(ppb_rstr(dev) & CLPIP_SHAKE))
426		if (--spin == 0) {
427			return 1;
428		}
429	return 0;
430}
431
432static __inline int
433clpinbyte (int spin, struct ppb_device *dev)
434{
435	int c, cl;
436
437	while((ppb_rstr(dev) & CLPIP_SHAKE))
438	    if(!--spin) {
439		return -1;
440	    }
441	cl = ppb_rstr(dev);
442	ppb_wdtr(dev, 0x10);
443
444	while(!(ppb_rstr(dev) & CLPIP_SHAKE))
445	    if(!--spin) {
446		return -1;
447	    }
448	c = ppb_rstr(dev);
449	ppb_wdtr(dev, 0x00);
450
451	return (ctrecvl[cl] | ctrecvh[c]);
452}
453
454static void
455lpintr (int unit)
456{
457	struct   lpt_softc *sc = lpdata[unit];
458	int len, s, j;
459	u_char *bp;
460	u_char c, cl;
461	struct mbuf *top;
462
463	s = splhigh();
464
465	if (sc->sc_if.if_flags & IFF_LINK0) {
466
467	    /* Ack. the request */
468	    ppb_wdtr(&sc->lp_dev, 0x01);
469
470	    /* Get the packet length */
471	    j = clpinbyte(LPMAXSPIN2, &sc->lp_dev);
472	    if (j == -1)
473		goto err;
474	    len = j;
475	    j = clpinbyte(LPMAXSPIN2, &sc->lp_dev);
476	    if (j == -1)
477		goto err;
478	    len = len + (j << 8);
479	    if (len > sc->sc_if.if_mtu + MLPIPHDRLEN)
480		goto err;
481
482	    bp  = sc->sc_ifbuf;
483
484	    while (len--) {
485	        j = clpinbyte(LPMAXSPIN2, &sc->lp_dev);
486	        if (j == -1) {
487		    goto err;
488	        }
489	        *bp++ = j;
490	    }
491	    /* Get and ignore checksum */
492	    j = clpinbyte(LPMAXSPIN2, &sc->lp_dev);
493	    if (j == -1) {
494	        goto err;
495	    }
496
497	    len = bp - sc->sc_ifbuf;
498	    if (len <= CLPIPHDRLEN)
499	        goto err;
500
501	    sc->sc_iferrs = 0;
502
503	    if (IF_QFULL(&ipintrq)) {
504	        lprintf("DROP");
505	        IF_DROP(&ipintrq);
506		goto done;
507	    }
508	    len -= CLPIPHDRLEN;
509	    sc->sc_if.if_ipackets++;
510	    sc->sc_if.if_ibytes += len;
511	    top = m_devget(sc->sc_ifbuf + CLPIPHDRLEN, len, 0, &sc->sc_if, 0);
512	    if (top) {
513	        IF_ENQUEUE(&ipintrq, top);
514	        schednetisr(NETISR_IP);
515	    }
516	    goto done;
517	}
518	while ((ppb_rstr(&sc->lp_dev) & LPIP_SHAKE)) {
519	    len = sc->sc_if.if_mtu + LPIPHDRLEN;
520	    bp  = sc->sc_ifbuf;
521	    while (len--) {
522
523		cl = ppb_rstr(&sc->lp_dev);
524		ppb_wdtr(&sc->lp_dev, 8);
525
526		j = LPMAXSPIN2;
527		while((ppb_rstr(&sc->lp_dev) & LPIP_SHAKE))
528		    if(!--j) goto err;
529
530		c = ppb_rstr(&sc->lp_dev);
531		ppb_wdtr(&sc->lp_dev, 0);
532
533		*bp++= trecvh[cl] | trecvl[c];
534
535		j = LPMAXSPIN2;
536		while (!((cl=ppb_rstr(&sc->lp_dev)) & LPIP_SHAKE)) {
537		    if (cl != c &&
538			(((cl = ppb_rstr(&sc->lp_dev)) ^ 0xb8) & 0xf8) ==
539			  (c & 0xf8))
540			goto end;
541		    if (!--j) goto err;
542		}
543	    }
544
545	end:
546	    len = bp - sc->sc_ifbuf;
547	    if (len <= LPIPHDRLEN)
548		goto err;
549
550	    sc->sc_iferrs = 0;
551
552	    if (IF_QFULL(&ipintrq)) {
553		lprintf("DROP");
554		IF_DROP(&ipintrq);
555		goto done;
556	    }
557#if NBPFILTER > 0
558	    if (sc->sc_if.if_bpf) {
559		bpf_tap(&sc->sc_if, sc->sc_ifbuf, len);
560	    }
561#endif
562	    len -= LPIPHDRLEN;
563	    sc->sc_if.if_ipackets++;
564	    sc->sc_if.if_ibytes += len;
565	    top = m_devget(sc->sc_ifbuf + LPIPHDRLEN, len, 0, &sc->sc_if, 0);
566	    if (top) {
567		    IF_ENQUEUE(&ipintrq, top);
568		    schednetisr(NETISR_IP);
569	    }
570	}
571	goto done;
572
573    err:
574	ppb_wdtr(&sc->lp_dev, 0);
575	lprintf("R");
576	sc->sc_if.if_ierrors++;
577	sc->sc_iferrs++;
578
579	/*
580	 * We are not able to send receive anything for now,
581	 * so stop wasting our time
582	 */
583	if (sc->sc_iferrs > LPMAXERRS) {
584	    printf("lp%d: Too many errors, Going off-line.\n", unit);
585	    ppb_wctr(&sc->lp_dev, 0x00);
586	    sc->sc_if.if_flags &= ~IFF_RUNNING;
587	    sc->sc_iferrs=0;
588	}
589
590    done:
591	splx(s);
592	return;
593}
594
595static __inline int
596lpoutbyte (u_char byte, int spin, struct ppb_device *dev)
597{
598    ppb_wdtr(dev, txmith[byte]);
599    while (!(ppb_rstr(dev) & LPIP_SHAKE))
600	if (--spin == 0)
601		return 1;
602    ppb_wdtr(dev, txmitl[byte]);
603    while (ppb_rstr(dev) & LPIP_SHAKE)
604	if (--spin == 0)
605		return 1;
606    return 0;
607}
608
609static int
610lpoutput (struct ifnet *ifp, struct mbuf *m,
611	  struct sockaddr *dst, struct rtentry *rt)
612{
613    struct lpt_softc *sc = lpdata[ifp->if_unit];
614    int s, err;
615    struct mbuf *mm;
616    u_char *cp = "\0\0";
617    u_char chksum = 0;
618    int count = 0;
619    int i;
620    int spin;
621
622    /* We need a sensible value if we abort */
623    cp++;
624    ifp->if_flags |= IFF_RUNNING;
625
626    err = 1;			/* assume we're aborting because of an error */
627
628    s = splhigh();
629
630    /* Suspend (on laptops) or receive-errors might have taken us offline */
631    ppb_wctr(&sc->lp_dev, LPC_ENA);
632
633    if (ifp->if_flags & IFF_LINK0) {
634
635	if (!(ppb_rstr(&sc->lp_dev) & CLPIP_SHAKE)) {
636	    lprintf("&");
637	    lpintr(ifp->if_unit);
638	}
639
640	/* Alert other end to pending packet */
641	spin = LPMAXSPIN1;
642	ppb_wdtr(&sc->lp_dev, 0x08);
643	while ((ppb_rstr(&sc->lp_dev) & 0x08) == 0)
644		if (--spin == 0) {
645			goto nend;
646		}
647
648	/* Calculate length of packet, then send that */
649
650	count += 14;		/* Ethernet header len */
651
652	mm = m;
653	for (mm = m; mm; mm = mm->m_next) {
654		count += mm->m_len;
655	}
656	if (clpoutbyte(count & 0xFF, LPMAXSPIN1, &sc->lp_dev))
657		goto nend;
658	if (clpoutbyte((count >> 8) & 0xFF, LPMAXSPIN1, &sc->lp_dev))
659		goto nend;
660
661	/* Send dummy ethernet header */
662	for (i = 0; i < 12; i++) {
663		if (clpoutbyte(i, LPMAXSPIN1, &sc->lp_dev))
664			goto nend;
665		chksum += i;
666	}
667
668	if (clpoutbyte(0x08, LPMAXSPIN1, &sc->lp_dev))
669		goto nend;
670	if (clpoutbyte(0x00, LPMAXSPIN1, &sc->lp_dev))
671		goto nend;
672	chksum += 0x08 + 0x00;		/* Add into checksum */
673
674	mm = m;
675	do {
676		cp = mtod(mm, u_char *);
677		while (mm->m_len--) {
678			chksum += *cp;
679			if (clpoutbyte(*cp++, LPMAXSPIN2, &sc->lp_dev))
680				goto nend;
681		}
682	} while ((mm = mm->m_next));
683
684	/* Send checksum */
685	if (clpoutbyte(chksum, LPMAXSPIN2, &sc->lp_dev))
686		goto nend;
687
688	/* Go quiescent */
689	ppb_wdtr(&sc->lp_dev, 0);
690
691	err = 0;			/* No errors */
692
693	nend:
694	if (err)  {				/* if we didn't timeout... */
695		ifp->if_oerrors++;
696		lprintf("X");
697	} else {
698		ifp->if_opackets++;
699		ifp->if_obytes += m->m_pkthdr.len;
700	}
701
702	m_freem(m);
703
704	if (!(ppb_rstr(&sc->lp_dev) & CLPIP_SHAKE)) {
705		lprintf("^");
706		lpintr(ifp->if_unit);
707	}
708	(void) splx(s);
709	return 0;
710    }
711
712    if (ppb_rstr(&sc->lp_dev) & LPIP_SHAKE) {
713        lprintf("&");
714        lpintr(ifp->if_unit);
715    }
716
717    if (lpoutbyte(0x08, LPMAXSPIN1, &sc->lp_dev))
718        goto end;
719    if (lpoutbyte(0x00, LPMAXSPIN2, &sc->lp_dev))
720        goto end;
721
722    mm = m;
723    do {
724        cp = mtod(mm,u_char *);
725        while (mm->m_len--)
726	    if (lpoutbyte(*cp++, LPMAXSPIN2, &sc->lp_dev))
727	        goto end;
728    } while ((mm = mm->m_next));
729
730    err = 0;				/* no errors were encountered */
731
732    end:
733    --cp;
734    ppb_wdtr(&sc->lp_dev, txmitl[*cp] ^ 0x17);
735
736    if (err)  {				/* if we didn't timeout... */
737	ifp->if_oerrors++;
738        lprintf("X");
739    } else {
740	ifp->if_opackets++;
741	ifp->if_obytes += m->m_pkthdr.len;
742#if NBPFILTER > 0
743	if (ifp->if_bpf) {
744	    /*
745	     * We need to prepend the packet type as
746	     * a two byte field.  Cons up a dummy header
747	     * to pacify bpf.  This is safe because bpf
748	     * will only read from the mbuf (i.e., it won't
749	     * try to free it or keep a pointer to it).
750	     */
751	    struct mbuf m0;
752	    u_short hdr = 0x800;
753
754	    m0.m_next = m;
755	    m0.m_len = 2;
756	    m0.m_data = (char *)&hdr;
757
758	    bpf_mtap(ifp, &m0);
759	}
760#endif
761    }
762
763    m_freem(m);
764
765    if (ppb_rstr(&sc->lp_dev) & LPIP_SHAKE) {
766	lprintf("^");
767	lpintr(ifp->if_unit);
768    }
769
770    (void) splx(s);
771    return 0;
772}
773