summaryrefslogtreecommitdiffstats
path: root/sys/dev/le/am79900.c
blob: 5129eb60f7da53233e658843bac9a4a1fd8d201d (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
/*	$NetBSD: am79900.c,v 1.17 2005/12/24 20:27:29 perry Exp $	*/

/*-
 * Copyright (c) 1997 The NetBSD Foundation, Inc.
 * All rights reserved.
 *
 * This code is derived from software contributed to The NetBSD Foundation
 * by Jason R. Thorpe.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by the NetBSD
 *	Foundation, Inc. and its contributors.
 * 4. Neither the name of The NetBSD Foundation nor the names of its
 *    contributors may be used to endorse or promote products derived
 *    from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

/*-
 * Copyright (c) 1992, 1993
 *	The Regents of the University of California.  All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * Ralph Campbell and Rick Macklem.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 *	@(#)if_le.c	8.2 (Berkeley) 11/16/93
 */

/*-
 * Copyright (c) 1998
 *	Matthias Drochner.  All rights reserved.
 * Copyright (c) 1995 Charles M. Hannum.  All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * Ralph Campbell and Rick Macklem.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by the University of
 *	California, Berkeley and its contributors.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 *	@(#)if_le.c	8.2 (Berkeley) 11/16/93
 */

#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");

#include <sys/param.h>
#include <sys/bus.h>
#include <sys/endian.h>
#include <sys/lock.h>
#include <sys/mbuf.h>
#include <sys/mutex.h>
#include <sys/socket.h>

#include <net/bpf.h>
#include <net/ethernet.h>
#include <net/if.h>
#include <net/if_arp.h>
#include <net/if_dl.h>
#include <net/if_media.h>
#include <net/if_var.h>

#include <machine/bus.h>

#include <dev/le/lancereg.h>
#include <dev/le/lancevar.h>
#include <dev/le/am79900reg.h>
#include <dev/le/am79900var.h>

static void	am79900_meminit(struct lance_softc *);
static void	am79900_rint(struct lance_softc *);
static void	am79900_tint(struct lance_softc *);
static void	am79900_start_locked(struct lance_softc *sc);

#ifdef LEDEBUG
static void	am79900_recv_print(struct lance_softc *, int);
static void	am79900_xmit_print(struct lance_softc *, int);
#endif

int
am79900_config(struct am79900_softc *sc, const char* name, int unit)
{
	int error, mem;

	sc->lsc.sc_meminit = am79900_meminit;
	sc->lsc.sc_start_locked = am79900_start_locked;

	error = lance_config(&sc->lsc, name, unit);
	if (error != 0)
		return (error);

	mem = 0;
	sc->lsc.sc_initaddr = mem;
	mem += sizeof(struct leinit);
	sc->lsc.sc_rmdaddr = mem;
	mem += sizeof(struct lermd) * sc->lsc.sc_nrbuf;
	sc->lsc.sc_tmdaddr = mem;
	mem += sizeof(struct letmd) * sc->lsc.sc_ntbuf;
	sc->lsc.sc_rbufaddr = mem;
	mem += LEBLEN * sc->lsc.sc_nrbuf;
	sc->lsc.sc_tbufaddr = mem;
	mem += LEBLEN * sc->lsc.sc_ntbuf;

	if (mem > sc->lsc.sc_memsize)
		panic("%s: memsize", __func__);

	lance_attach(&sc->lsc);

	return (0);
}

void
am79900_detach(struct am79900_softc *sc)
{

	lance_detach(&sc->lsc);
}

/*
 * Set up the initialization block and the descriptor rings.
 */
static void
am79900_meminit(struct lance_softc *sc)
{
	struct ifnet *ifp = sc->sc_ifp;
	struct leinit init;
	struct lermd rmd;
	struct letmd tmd;
	u_long a;
	int bix;

	LE_LOCK_ASSERT(sc, MA_OWNED);

	if (ifp->if_flags & IFF_PROMISC)
		init.init_mode = LE_HTOLE32(LE_MODE_NORMAL | LE_MODE_PROM);
	else
		init.init_mode = LE_HTOLE32(LE_MODE_NORMAL);

	init.init_mode |= LE_HTOLE32(((ffs(sc->sc_ntbuf) - 1) << 28) |
	    ((ffs(sc->sc_nrbuf) - 1) << 20));

	init.init_padr[0] = LE_HTOLE32(sc->sc_enaddr[0] |
	    (sc->sc_enaddr[1] << 8) | (sc->sc_enaddr[2] << 16) |
	    (sc->sc_enaddr[3] << 24));
	init.init_padr[1] = LE_HTOLE32(sc->sc_enaddr[4] |
	    (sc->sc_enaddr[5] << 8));
	lance_setladrf(sc, init.init_ladrf);

	sc->sc_last_rd = 0;
	sc->sc_first_td = sc->sc_last_td = sc->sc_no_td = 0;

	a = sc->sc_addr + LE_RMDADDR(sc, 0);
	init.init_rdra = LE_HTOLE32(a);

	a = sc->sc_addr + LE_TMDADDR(sc, 0);
	init.init_tdra = LE_HTOLE32(a);

	(*sc->sc_copytodesc)(sc, &init, LE_INITADDR(sc), sizeof(init));

	/*
	 * Set up receive ring descriptors.
	 */
	for (bix = 0; bix < sc->sc_nrbuf; bix++) {
		a = sc->sc_addr + LE_RBUFADDR(sc, bix);
		rmd.rmd0 = LE_HTOLE32(a);
		rmd.rmd1 = LE_HTOLE32(LE_R1_OWN | LE_R1_ONES |
		    (-LEBLEN & 0xfff));
		rmd.rmd2 = 0;
		rmd.rmd3 = 0;
		(*sc->sc_copytodesc)(sc, &rmd, LE_RMDADDR(sc, bix),
		    sizeof(rmd));
	}

	/*
	 * Set up transmit ring descriptors.
	 */
	for (bix = 0; bix < sc->sc_ntbuf; bix++) {
		a = sc->sc_addr + LE_TBUFADDR(sc, bix);
		tmd.tmd0 = LE_HTOLE32(a);
		tmd.tmd1 = LE_HTOLE32(LE_T1_ONES);
		tmd.tmd2 = 0;
		tmd.tmd3 = 0;
		(*sc->sc_copytodesc)(sc, &tmd, LE_TMDADDR(sc, bix),
		    sizeof(tmd));
	}
}

static inline void
am79900_rint(struct lance_softc *sc)
{
	struct ifnet *ifp = sc->sc_ifp;
	struct mbuf *m;
	struct lermd rmd;
	uint32_t rmd1;
	int bix, rp;
#if defined(__i386__) && !defined(PC98)
	struct ether_header *eh;
#endif

	bix = sc->sc_last_rd;

	/* Process all buffers with valid data. */
	for (;;) {
		rp = LE_RMDADDR(sc, bix);
		(*sc->sc_copyfromdesc)(sc, &rmd, rp, sizeof(rmd));

		rmd1 = LE_LE32TOH(rmd.rmd1);
		if (rmd1 & LE_R1_OWN)
			break;

		m = NULL;
		if ((rmd1 & (LE_R1_ERR | LE_R1_STP | LE_R1_ENP)) !=
		    (LE_R1_STP | LE_R1_ENP)){
			if (rmd1 & LE_R1_ERR) {
#ifdef LEDEBUG
				if (rmd1 & LE_R1_ENP) {
					if ((rmd1 & LE_R1_OFLO) == 0) {
						if (rmd1 & LE_R1_FRAM)
							if_printf(ifp,
							    "framing error\n");
						if (rmd1 & LE_R1_CRC)
							if_printf(ifp,
							    "crc mismatch\n");
					}
				} else
					if (rmd1 & LE_R1_OFLO)
						if_printf(ifp, "overflow\n");
#endif
				if (rmd1 & LE_R1_BUFF)
					if_printf(ifp,
					    "receive buffer error\n");
			} else if ((rmd1 & (LE_R1_STP | LE_R1_ENP)) !=
			    (LE_R1_STP | LE_R1_ENP))
				if_printf(ifp, "dropping chained buffer\n");
		} else {
#ifdef LEDEBUG
			if (sc->sc_flags & LE_DEBUG)
				am79900_recv_print(sc, bix);
#endif
			/* Pull the packet off the interface. */
			m = lance_get(sc, LE_RBUFADDR(sc, bix),
			    (LE_LE32TOH(rmd.rmd2) & 0xfff) - ETHER_CRC_LEN);
		}

		rmd.rmd1 = LE_HTOLE32(LE_R1_OWN | LE_R1_ONES |
		    (-LEBLEN & 0xfff));
		rmd.rmd2 = 0;
		rmd.rmd3 = 0;
		(*sc->sc_copytodesc)(sc, &rmd, rp, sizeof(rmd));

		if (++bix == sc->sc_nrbuf)
			bix = 0;

		if (m != NULL) {
			ifp->if_ipackets++;

#if defined(__i386__) && !defined(PC98)
			/*
			 * The VMware LANCE does not present IFF_SIMPLEX
			 * behavior on multicast packets. Thus drop the
			 * packet if it is from ourselves.
			 */
			eh = mtod(m, struct ether_header *);
			if (!ether_cmp(eh->ether_shost, sc->sc_enaddr)) {
				m_freem(m);
				continue;
			}
#endif

			/* Pass the packet up. */
			LE_UNLOCK(sc);
			(*ifp->if_input)(ifp, m);
			LE_LOCK(sc);
		} else
			ifp->if_ierrors++;
	}

	sc->sc_last_rd = bix;
}

static inline void
am79900_tint(struct lance_softc *sc)
{
	struct ifnet *ifp = sc->sc_ifp;
	struct letmd tmd;
	uint32_t tmd1, tmd2;
	int bix;

	bix = sc->sc_first_td;

	for (;;) {
		if (sc->sc_no_td <= 0)
			break;

		(*sc->sc_copyfromdesc)(sc, &tmd, LE_TMDADDR(sc, bix),
		    sizeof(tmd));

		tmd1 = LE_LE32TOH(tmd.tmd1);

#ifdef LEDEBUG
		if (sc->sc_flags & LE_DEBUG)
			if_printf(ifp, "trans tmd: "
			    "adr %08x, flags/blen %08x\n",
			    LE_LE32TOH(tmd.tmd0), tmd1);
#endif

		if (tmd1 & LE_T1_OWN)
			break;

		ifp->if_drv_flags &= ~IFF_DRV_OACTIVE;

		if (tmd1 & LE_T1_ERR) {
			tmd2 = LE_LE32TOH(tmd.tmd2);
			if (tmd2 & LE_T2_BUFF)
				if_printf(ifp, "transmit buffer error\n");
			else if (tmd2 & LE_T2_UFLO)
				if_printf(ifp, "underflow\n");
			if (tmd2 & (LE_T2_BUFF | LE_T2_UFLO)) {
				lance_init_locked(sc);
				return;
			}
			if (tmd2 & LE_T2_LCAR) {
				if (sc->sc_flags & LE_CARRIER)
					if_link_state_change(ifp,
					    LINK_STATE_DOWN);
				sc->sc_flags &= ~LE_CARRIER;
				if (sc->sc_nocarrier)
					(*sc->sc_nocarrier)(sc);
				else
					if_printf(ifp, "lost carrier\n");
			}
			if (tmd2 & LE_T2_LCOL)
				ifp->if_collisions++;
			if (tmd2 & LE_T2_RTRY) {
#ifdef LEDEBUG
				if_printf(ifp, "excessive collisions\n");
#endif
				ifp->if_collisions += 16;
			}
			ifp->if_oerrors++;
		} else {
			if (tmd1 & LE_T1_ONE)
				ifp->if_collisions++;
			else if (tmd1 & LE_T1_MORE)
				/* Real number is unknown. */
				ifp->if_collisions += 2;
			ifp->if_opackets++;
		}

		if (++bix == sc->sc_ntbuf)
			bix = 0;

		--sc->sc_no_td;
	}

	sc->sc_first_td = bix;

	sc->sc_wdog_timer = sc->sc_no_td > 0 ? 5 : 0;
}

/*
 * Controller interrupt
 */
void
am79900_intr(void *arg)
{
	struct lance_softc *sc = arg;
	struct ifnet *ifp = sc->sc_ifp;
	uint16_t isr;

	LE_LOCK(sc);

	if (sc->sc_hwintr && (*sc->sc_hwintr)(sc) == -1) {
		ifp->if_ierrors++;
		lance_init_locked(sc);
		LE_UNLOCK(sc);
		return;
	}

	isr = (*sc->sc_rdcsr)(sc, LE_CSR0);
#if defined(LEDEBUG) && LEDEBUG > 1
	if (sc->sc_flags & LE_DEBUG)
		if_printf(ifp, "%s: entering with isr=%04x\n", __func__, isr);
#endif
	if ((isr & LE_C0_INTR) == 0) {
		LE_UNLOCK(sc);
		return;
	}

	/*
	 * Clear interrupt source flags and turn off interrupts. If we
	 * don't clear these flags before processing their sources we
	 * could completely miss some interrupt events as the NIC can
	 * change these flags while we're in this handler. We toggle
	 * the interrupt enable bit in order to keep receiving them
	 * (some chips work without this, some don't).
	 */
	(*sc->sc_wrcsr)(sc, LE_CSR0, isr & ~(LE_C0_INEA | LE_C0_TDMD |
	    LE_C0_STOP | LE_C0_STRT | LE_C0_INIT));

	if (isr & LE_C0_ERR) {
		if (isr & LE_C0_BABL) {
#ifdef LEDEBUG
			if_printf(ifp, "babble\n");
#endif
			ifp->if_oerrors++;
		}
#if 0
		if (isr & LE_C0_CERR) {
			if_printf(ifp, "collision error\n");
			ifp->if_collisions++;
		}
#endif
		if (isr & LE_C0_MISS) {
#ifdef LEDEBUG
			if_printf(ifp, "missed packet\n");
#endif
			ifp->if_ierrors++;
		}
		if (isr & LE_C0_MERR) {
			if_printf(ifp, "memory error\n");
			lance_init_locked(sc);
			LE_UNLOCK(sc);
			return;
		}
	}

	if ((isr & LE_C0_RXON) == 0) {
		if_printf(ifp, "receiver disabled\n");
		ifp->if_ierrors++;
		lance_init_locked(sc);
		LE_UNLOCK(sc);
		return;
	}
	if ((isr & LE_C0_TXON) == 0) {
		if_printf(ifp, "transmitter disabled\n");
		ifp->if_oerrors++;
		lance_init_locked(sc);
		LE_UNLOCK(sc);
		return;
	}

	/*
	 * Pretend we have carrier; if we don't this will be cleared shortly.
	 */
	if (!(sc->sc_flags & LE_CARRIER))
		if_link_state_change(ifp, LINK_STATE_UP);
	sc->sc_flags |= LE_CARRIER;

	if (isr & LE_C0_RINT)
		am79900_rint(sc);
	if (isr & LE_C0_TINT)
		am79900_tint(sc);

	/* Enable interrupts again. */
	(*sc->sc_wrcsr)(sc, LE_CSR0, LE_C0_INEA);

	if (!IFQ_DRV_IS_EMPTY(&ifp->if_snd))
		am79900_start_locked(sc);

	LE_UNLOCK(sc);
}

/*
 * Set up output on interface.
 * Get another datagram to send off of the interface queue, and map it to the
 * interface before starting the output.
 */
static void
am79900_start_locked(struct lance_softc *sc)
{
	struct ifnet *ifp = sc->sc_ifp;
	struct letmd tmd;
	struct mbuf *m;
	int bix, enq, len, rp;

	LE_LOCK_ASSERT(sc, MA_OWNED);

	if ((ifp->if_drv_flags & (IFF_DRV_RUNNING | IFF_DRV_OACTIVE)) !=
	    IFF_DRV_RUNNING)
		return;

	bix = sc->sc_last_td;
	enq = 0;

	for (; sc->sc_no_td < sc->sc_ntbuf &&
	    !IFQ_DRV_IS_EMPTY(&ifp->if_snd);) {
		rp = LE_TMDADDR(sc, bix);
		(*sc->sc_copyfromdesc)(sc, &tmd, rp, sizeof(tmd));

		if (LE_LE32TOH(tmd.tmd1) & LE_T1_OWN) {
			ifp->if_drv_flags |= IFF_DRV_OACTIVE;
			if_printf(ifp,
			    "missing buffer, no_td = %d, last_td = %d\n",
			    sc->sc_no_td, sc->sc_last_td);
		}

		IFQ_DRV_DEQUEUE(&ifp->if_snd, m);
		if (m == 0)
			break;

		/*
		 * If BPF is listening on this interface, let it see the packet
		 * before we commit it to the wire.
		 */
		BPF_MTAP(ifp, m);

		/*
		 * Copy the mbuf chain into the transmit buffer.
		 */
		len = lance_put(sc, LE_TBUFADDR(sc, bix), m);

#ifdef LEDEBUG
		if (len > ETHERMTU + ETHER_HDR_LEN)
			if_printf(ifp, "packet length %d\n", len);
#endif

		/*
		 * Init transmit registers, and set transmit start flag.
		 */
		tmd.tmd1 = LE_HTOLE32(LE_T1_OWN | LE_T1_STP | LE_T1_ENP |
		    LE_T1_ONES | (-len & 0xfff));
		tmd.tmd2 = 0;
		tmd.tmd3 = 0;

		(*sc->sc_copytodesc)(sc, &tmd, rp, sizeof(tmd));

#ifdef LEDEBUG
		if (sc->sc_flags & LE_DEBUG)
			am79900_xmit_print(sc, bix);
#endif

		(*sc->sc_wrcsr)(sc, LE_CSR0, LE_C0_INEA | LE_C0_TDMD);
		enq++;

		if (++bix == sc->sc_ntbuf)
			bix = 0;

		if (++sc->sc_no_td == sc->sc_ntbuf) {
			ifp->if_drv_flags |= IFF_DRV_OACTIVE;
			break;
		}
	}

	sc->sc_last_td = bix;

	if (enq > 0)
		sc->sc_wdog_timer = 5;
}

#ifdef LEDEBUG
static void
am79900_recv_print(struct lance_softc *sc, int no)
{
	struct ifnet *ifp = sc->sc_ifp;
	struct ether_header eh;
	struct lermd rmd;
	uint16_t len;

	(*sc->sc_copyfromdesc)(sc, &rmd, LE_RMDADDR(sc, no), sizeof(rmd));
	len = LE_LE32TOH(rmd.rmd2) & 0xfff;
	if_printf(ifp, "receive buffer %d, len = %d\n", no, len);
	if_printf(ifp, "status %04x\n", (*sc->sc_rdcsr)(sc, LE_CSR0));
	if_printf(ifp, "adr %08x, flags/blen %08x\n", LE_LE32TOH(rmd.rmd0),
	    LE_LE32TOH(rmd.rmd1));
	if (len - ETHER_CRC_LEN >= sizeof(eh)) {
		(*sc->sc_copyfrombuf)(sc, &eh, LE_RBUFADDR(sc, no), sizeof(eh));
		if_printf(ifp, "dst %s", ether_sprintf(eh.ether_dhost));
		printf(" src %s type %04x\n", ether_sprintf(eh.ether_shost),
		    ntohs(eh.ether_type));
	}
}

static void
am79900_xmit_print(struct lance_softc *sc, int no)
{
	struct ifnet *ifp = sc->sc_ifp;
	struct ether_header eh;
	struct letmd tmd;
	uint16_t len;

	(*sc->sc_copyfromdesc)(sc, &tmd, LE_TMDADDR(sc, no), sizeof(tmd));
	len = -(LE_LE32TOH(tmd.tmd1) & 0xfff);
	if_printf(ifp, "transmit buffer %d, len = %d\n", no, len);
	if_printf(ifp, "status %04x\n", (*sc->sc_rdcsr)(sc, LE_CSR0));
	if_printf(ifp, "adr %08x, flags/blen %08x\n", LE_LE32TOH(tmd.tmd0),
	    LE_LE32TOH(tmd.tmd1));
	if (len >= sizeof(eh)) {
		(*sc->sc_copyfrombuf)(sc, &eh, LE_TBUFADDR(sc, no), sizeof(eh));
		if_printf(ifp, "dst %s", ether_sprintf(eh.ether_dhost));
		printf(" src %s type %04x\n", ether_sprintf(eh.ether_shost),
		    ntohs(eh.ether_type));
	}
}
#endif /* LEDEBUG */
OpenPOWER on IntegriCloud