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43
44#define VERSION "arcnet: v3.94 BETA 2007/02/08 - by Avery Pennarun et al.\n"
45
46#include <linux/module.h>
47#include <linux/types.h>
48#include <linux/delay.h>
49#include <linux/netdevice.h>
50#include <linux/if_arp.h>
51#include <net/arp.h>
52#include <linux/init.h>
53#include <linux/arcdevice.h>
54#include <linux/jiffies.h>
55
56
57static void null_rx(struct net_device *dev, int bufnum,
58 struct archdr *pkthdr, int length);
59static int null_build_header(struct sk_buff *skb, struct net_device *dev,
60 unsigned short type, uint8_t daddr);
61static int null_prepare_tx(struct net_device *dev, struct archdr *pkt,
62 int length, int bufnum);
63
64static void arcnet_rx(struct net_device *dev, int bufnum);
65
66
67
68
69
70
71
72 struct ArcProto *arc_proto_map[256], *arc_proto_default,
73 *arc_bcast_proto, *arc_raw_proto;
74
75static struct ArcProto arc_proto_null =
76{
77 .suffix = '?',
78 .mtu = XMTU,
79 .is_ip = 0,
80 .rx = null_rx,
81 .build_header = null_build_header,
82 .prepare_tx = null_prepare_tx,
83 .continue_tx = NULL,
84 .ack_tx = NULL
85};
86
87
88int arcnet_debug = ARCNET_DEBUG;
89
90EXPORT_SYMBOL(arc_proto_map);
91EXPORT_SYMBOL(arc_proto_default);
92EXPORT_SYMBOL(arc_bcast_proto);
93EXPORT_SYMBOL(arc_raw_proto);
94EXPORT_SYMBOL(arcnet_unregister_proto);
95EXPORT_SYMBOL(arcnet_debug);
96EXPORT_SYMBOL(alloc_arcdev);
97EXPORT_SYMBOL(arcnet_interrupt);
98EXPORT_SYMBOL(arcnet_open);
99EXPORT_SYMBOL(arcnet_close);
100EXPORT_SYMBOL(arcnet_send_packet);
101EXPORT_SYMBOL(arcnet_timeout);
102
103
104static int arcnet_header(struct sk_buff *skb, struct net_device *dev,
105 unsigned short type, const void *daddr,
106 const void *saddr, unsigned len);
107static int arcnet_rebuild_header(struct sk_buff *skb);
108static int go_tx(struct net_device *dev);
109
110static int debug = ARCNET_DEBUG;
111module_param(debug, int, 0);
112MODULE_LICENSE("GPL");
113
114static int __init arcnet_init(void)
115{
116 int count;
117
118 arcnet_debug = debug;
119
120 printk("arcnet loaded.\n");
121
122#ifdef ALPHA_WARNING
123 BUGLVL(D_EXTRA) {
124 printk("arcnet: ***\n"
125 "arcnet: * Read arcnet.txt for important release notes!\n"
126 "arcnet: *\n"
127 "arcnet: * This is an ALPHA version! (Last stable release: v3.02) E-mail\n"
128 "arcnet: * me if you have any questions, comments, or bug reports.\n"
129 "arcnet: ***\n");
130 }
131#endif
132
133
134 arc_raw_proto = arc_proto_default = arc_bcast_proto = &arc_proto_null;
135 for (count = 0; count < 256; count++)
136 arc_proto_map[count] = arc_proto_default;
137
138 BUGLVL(D_DURING)
139 printk("arcnet: struct sizes: %Zd %Zd %Zd %Zd %Zd\n",
140 sizeof(struct arc_hardware), sizeof(struct arc_rfc1201),
141 sizeof(struct arc_rfc1051), sizeof(struct arc_eth_encap),
142 sizeof(struct archdr));
143
144 return 0;
145}
146
147static void __exit arcnet_exit(void)
148{
149}
150
151module_init(arcnet_init);
152module_exit(arcnet_exit);
153
154
155
156
157#if ARCNET_DEBUG_MAX & D_SKB
158void arcnet_dump_skb(struct net_device *dev,
159 struct sk_buff *skb, char *desc)
160{
161 char hdr[32];
162
163
164 snprintf(hdr, sizeof(hdr), "%6s:%s skb->data:", dev->name, desc);
165 print_hex_dump(KERN_DEBUG, hdr, DUMP_PREFIX_OFFSET,
166 16, 1, skb->data, skb->len, true);
167}
168
169EXPORT_SYMBOL(arcnet_dump_skb);
170#endif
171
172
173
174
175
176#if (ARCNET_DEBUG_MAX & (D_RX | D_TX))
177static void arcnet_dump_packet(struct net_device *dev, int bufnum,
178 char *desc, int take_arcnet_lock)
179{
180 struct arcnet_local *lp = netdev_priv(dev);
181 int i, length;
182 unsigned long flags = 0;
183 static uint8_t buf[512];
184 char hdr[32];
185
186
187
188 if(take_arcnet_lock)
189 spin_lock_irqsave(&lp->lock, flags);
190
191 lp->hw.copy_from_card(dev, bufnum, 0, buf, 512);
192 if(take_arcnet_lock)
193 spin_unlock_irqrestore(&lp->lock, flags);
194
195
196 length = (buf[2] ? 256 : 512);
197
198
199 snprintf(hdr, sizeof(hdr), "%6s:%s packet dump:", dev->name, desc);
200 print_hex_dump(KERN_DEBUG, hdr, DUMP_PREFIX_OFFSET,
201 16, 1, buf, length, true);
202}
203
204#else
205
206#define arcnet_dump_packet(dev, bufnum, desc,take_arcnet_lock) do { } while (0)
207
208#endif
209
210
211
212
213
214
215
216void arcnet_unregister_proto(struct ArcProto *proto)
217{
218 int count;
219
220 if (arc_proto_default == proto)
221 arc_proto_default = &arc_proto_null;
222 if (arc_bcast_proto == proto)
223 arc_bcast_proto = arc_proto_default;
224 if (arc_raw_proto == proto)
225 arc_raw_proto = arc_proto_default;
226
227 for (count = 0; count < 256; count++) {
228 if (arc_proto_map[count] == proto)
229 arc_proto_map[count] = arc_proto_default;
230 }
231}
232
233
234
235
236
237
238
239
240
241static void release_arcbuf(struct net_device *dev, int bufnum)
242{
243 struct arcnet_local *lp = netdev_priv(dev);
244 int i;
245
246 lp->buf_queue[lp->first_free_buf++] = bufnum;
247 lp->first_free_buf %= 5;
248
249 BUGLVL(D_DURING) {
250 BUGMSG(D_DURING, "release_arcbuf: freed #%d; buffer queue is now: ",
251 bufnum);
252 for (i = lp->next_buf; i != lp->first_free_buf; i = (i+1) % 5)
253 BUGMSG2(D_DURING, "#%d ", lp->buf_queue[i]);
254 BUGMSG2(D_DURING, "\n");
255 }
256}
257
258
259
260
261
262
263static int get_arcbuf(struct net_device *dev)
264{
265 struct arcnet_local *lp = netdev_priv(dev);
266 int buf = -1, i;
267
268 if (!atomic_dec_and_test(&lp->buf_lock)) {
269
270 BUGMSG(D_NORMAL, "get_arcbuf: overlap (%d)!\n",
271 lp->buf_lock.counter);
272 }
273 else {
274 if (lp->next_buf >= 5)
275 lp->next_buf -= 5;
276
277 if (lp->next_buf == lp->first_free_buf)
278 BUGMSG(D_NORMAL, "get_arcbuf: BUG: no buffers are available??\n");
279 else {
280 buf = lp->buf_queue[lp->next_buf++];
281 lp->next_buf %= 5;
282 }
283 }
284
285
286 BUGLVL(D_DURING) {
287 BUGMSG(D_DURING, "get_arcbuf: got #%d; buffer queue is now: ", buf);
288 for (i = lp->next_buf; i != lp->first_free_buf; i = (i+1) % 5)
289 BUGMSG2(D_DURING, "#%d ", lp->buf_queue[i]);
290 BUGMSG2(D_DURING, "\n");
291 }
292
293 atomic_inc(&lp->buf_lock);
294 return buf;
295}
296
297
298static int choose_mtu(void)
299{
300 int count, mtu = 65535;
301
302
303 for (count = 0; count < 256; count++) {
304 if (arc_proto_map[count] != &arc_proto_null &&
305 arc_proto_map[count]->mtu < mtu) {
306 mtu = arc_proto_map[count]->mtu;
307 }
308 }
309
310 return mtu == 65535 ? XMTU : mtu;
311}
312
313static const struct header_ops arcnet_header_ops = {
314 .create = arcnet_header,
315 .rebuild = arcnet_rebuild_header,
316};
317
318static const struct net_device_ops arcnet_netdev_ops = {
319 .ndo_open = arcnet_open,
320 .ndo_stop = arcnet_close,
321 .ndo_start_xmit = arcnet_send_packet,
322 .ndo_tx_timeout = arcnet_timeout,
323};
324
325
326static void arcdev_setup(struct net_device *dev)
327{
328 dev->type = ARPHRD_ARCNET;
329 dev->netdev_ops = &arcnet_netdev_ops;
330 dev->header_ops = &arcnet_header_ops;
331 dev->hard_header_len = sizeof(struct archdr);
332 dev->mtu = choose_mtu();
333
334 dev->addr_len = ARCNET_ALEN;
335 dev->tx_queue_len = 100;
336 dev->broadcast[0] = 0x00;
337 dev->watchdog_timeo = TX_TIMEOUT;
338
339
340 dev->flags = IFF_BROADCAST;
341
342}
343
344struct net_device *alloc_arcdev(const char *name)
345{
346 struct net_device *dev;
347
348 dev = alloc_netdev(sizeof(struct arcnet_local),
349 name && *name ? name : "arc%d", arcdev_setup);
350 if(dev) {
351 struct arcnet_local *lp = netdev_priv(dev);
352 spin_lock_init(&lp->lock);
353 }
354
355 return dev;
356}
357
358
359
360
361
362
363
364
365
366int arcnet_open(struct net_device *dev)
367{
368 struct arcnet_local *lp = netdev_priv(dev);
369 int count, newmtu, error;
370
371 BUGMSG(D_INIT,"opened.");
372
373 if (!try_module_get(lp->hw.owner))
374 return -ENODEV;
375
376 BUGLVL(D_PROTO) {
377 BUGMSG(D_PROTO, "protocol map (default is '%c'): ",
378 arc_proto_default->suffix);
379 for (count = 0; count < 256; count++)
380 BUGMSG2(D_PROTO, "%c", arc_proto_map[count]->suffix);
381 BUGMSG2(D_PROTO, "\n");
382 }
383
384
385 BUGMSG(D_INIT, "arcnet_open: resetting card.\n");
386
387
388
389
390 error = -ENODEV;
391 if (ARCRESET(0) && ARCRESET(1))
392 goto out_module_put;
393
394 newmtu = choose_mtu();
395 if (newmtu < dev->mtu)
396 dev->mtu = newmtu;
397
398 BUGMSG(D_INIT, "arcnet_open: mtu: %d.\n", dev->mtu);
399
400
401 memset(lp->default_proto, 0, sizeof(lp->default_proto));
402
403
404 for (count = 0; count < 256; count++) {
405 if (arc_proto_map[count] == arc_bcast_proto) {
406 lp->default_proto[0] = count;
407 break;
408 }
409 }
410
411
412 atomic_set(&lp->buf_lock, 1);
413
414 lp->next_buf = lp->first_free_buf = 0;
415 release_arcbuf(dev, 0);
416 release_arcbuf(dev, 1);
417 release_arcbuf(dev, 2);
418 release_arcbuf(dev, 3);
419 lp->cur_tx = lp->next_tx = -1;
420 lp->cur_rx = -1;
421
422 lp->rfc1201.sequence = 1;
423
424
425 if (lp->hw.open)
426 lp->hw.open(dev);
427
428 if (dev->dev_addr[0] == 0)
429 BUGMSG(D_NORMAL, "WARNING! Station address 00 is reserved "
430 "for broadcasts!\n");
431 else if (dev->dev_addr[0] == 255)
432 BUGMSG(D_NORMAL, "WARNING! Station address FF may confuse "
433 "DOS networking programs!\n");
434
435 BUGMSG(D_DEBUG, "%s: %d: %s\n",__FILE__,__LINE__,__func__);
436 if (ASTATUS() & RESETflag) {
437 BUGMSG(D_DEBUG, "%s: %d: %s\n",__FILE__,__LINE__,__func__);
438 ACOMMAND(CFLAGScmd | RESETclear);
439 }
440
441
442 BUGMSG(D_DEBUG, "%s: %d: %s\n",__FILE__,__LINE__,__func__);
443
444 AINTMASK(0);
445 udelay(1);
446
447
448
449 BUGMSG(D_DEBUG, "%s: %d: %s\n",__FILE__,__LINE__,__func__);
450 lp->intmask = NORXflag | RECONflag;
451 AINTMASK(lp->intmask);
452 BUGMSG(D_DEBUG, "%s: %d: %s\n",__FILE__,__LINE__,__func__);
453
454 netif_start_queue(dev);
455
456 return 0;
457
458 out_module_put:
459 module_put(lp->hw.owner);
460 return error;
461}
462
463
464
465int arcnet_close(struct net_device *dev)
466{
467 struct arcnet_local *lp = netdev_priv(dev);
468
469 netif_stop_queue(dev);
470
471
472 AINTMASK(0);
473 ACOMMAND(NOTXcmd);
474 ACOMMAND(NORXcmd);
475 mdelay(1);
476
477
478 lp->hw.close(dev);
479 module_put(lp->hw.owner);
480 return 0;
481}
482
483
484static int arcnet_header(struct sk_buff *skb, struct net_device *dev,
485 unsigned short type, const void *daddr,
486 const void *saddr, unsigned len)
487{
488 const struct arcnet_local *lp = netdev_priv(dev);
489 uint8_t _daddr, proto_num;
490 struct ArcProto *proto;
491
492 BUGMSG(D_DURING,
493 "create header from %d to %d; protocol %d (%Xh); size %u.\n",
494 saddr ? *(uint8_t *) saddr : -1,
495 daddr ? *(uint8_t *) daddr : -1,
496 type, type, len);
497
498 if (skb->len!=0 && len != skb->len)
499 BUGMSG(D_NORMAL, "arcnet_header: Yikes! skb->len(%d) != len(%d)!\n",
500 skb->len, len);
501
502
503
504 if(type == ETH_P_ARCNET) {
505 proto = arc_raw_proto;
506 BUGMSG(D_DEBUG, "arc_raw_proto used. proto='%c'\n",proto->suffix);
507 _daddr = daddr ? *(uint8_t *) daddr : 0;
508 }
509 else if (!daddr) {
510
511
512
513
514
515 *(uint16_t *) skb_push(skb, 2) = type;
516
517
518
519 if (skb->network_header - skb->mac_header != 2)
520 BUGMSG(D_NORMAL, "arcnet_header: Yikes! diff (%d) is not 2!\n",
521 (int)(skb->network_header - skb->mac_header));
522 return -2;
523 }
524 else {
525
526 _daddr = *(uint8_t *) daddr;
527 proto_num = lp->default_proto[_daddr];
528 proto = arc_proto_map[proto_num];
529 BUGMSG(D_DURING, "building header for %02Xh using protocol '%c'\n",
530 proto_num, proto->suffix);
531 if (proto == &arc_proto_null && arc_bcast_proto != proto) {
532 BUGMSG(D_DURING, "actually, let's use '%c' instead.\n",
533 arc_bcast_proto->suffix);
534 proto = arc_bcast_proto;
535 }
536 }
537 return proto->build_header(skb, dev, type, _daddr);
538}
539
540
541
542
543
544
545
546static int arcnet_rebuild_header(struct sk_buff *skb)
547{
548 struct net_device *dev = skb->dev;
549 struct arcnet_local *lp = netdev_priv(dev);
550 int status = 0;
551 unsigned short type;
552 uint8_t daddr=0;
553 struct ArcProto *proto;
554
555
556
557 if (skb->network_header - skb->mac_header != 2) {
558 BUGMSG(D_NORMAL,
559 "rebuild_header: shouldn't be here! (hdrsize=%d)\n",
560 (int)(skb->network_header - skb->mac_header));
561 return 0;
562 }
563 type = *(uint16_t *) skb_pull(skb, 2);
564 BUGMSG(D_DURING, "rebuild header for protocol %Xh\n", type);
565
566 if (type == ETH_P_IP) {
567#ifdef CONFIG_INET
568 BUGMSG(D_DURING, "rebuild header for ethernet protocol %Xh\n", type);
569 status = arp_find(&daddr, skb) ? 1 : 0;
570 BUGMSG(D_DURING, " rebuilt: dest is %d; protocol %Xh\n",
571 daddr, type);
572#endif
573 } else {
574 BUGMSG(D_NORMAL,
575 "I don't understand ethernet protocol %Xh addresses!\n", type);
576 dev->stats.tx_errors++;
577 dev->stats.tx_aborted_errors++;
578 }
579
580
581 if (!status)
582 return 0;
583
584
585 proto = arc_proto_map[lp->default_proto[daddr]];
586 proto->build_header(skb, dev, type, daddr);
587
588 return 1;
589}
590
591
592
593
594netdev_tx_t arcnet_send_packet(struct sk_buff *skb,
595 struct net_device *dev)
596{
597 struct arcnet_local *lp = netdev_priv(dev);
598 struct archdr *pkt;
599 struct arc_rfc1201 *soft;
600 struct ArcProto *proto;
601 int txbuf;
602 unsigned long flags;
603 int freeskb, retval;
604
605 BUGMSG(D_DURING,
606 "transmit requested (status=%Xh, txbufs=%d/%d, len=%d, protocol %x)\n",
607 ASTATUS(), lp->cur_tx, lp->next_tx, skb->len,skb->protocol);
608
609 pkt = (struct archdr *) skb->data;
610 soft = &pkt->soft.rfc1201;
611 proto = arc_proto_map[soft->proto];
612
613 BUGMSG(D_SKB_SIZE, "skb: transmitting %d bytes to %02X\n",
614 skb->len, pkt->hard.dest);
615 BUGLVL(D_SKB) arcnet_dump_skb(dev, skb, "tx");
616
617
618 if (skb->len - ARC_HDR_SIZE > XMTU && !proto->continue_tx) {
619 BUGMSG(D_NORMAL, "fixme: packet too large: compensating badly!\n");
620 dev_kfree_skb(skb);
621 return NETDEV_TX_OK;
622 }
623
624
625 netif_stop_queue(dev);
626
627 spin_lock_irqsave(&lp->lock, flags);
628 AINTMASK(0);
629 if(lp->next_tx == -1)
630 txbuf = get_arcbuf(dev);
631 else {
632 txbuf = -1;
633 }
634 if (txbuf != -1) {
635 if (proto->prepare_tx(dev, pkt, skb->len, txbuf) &&
636 !proto->ack_tx) {
637
638
639 dev->stats.tx_bytes += skb->len;
640 freeskb = 1;
641 } else {
642
643 lp->outgoing.proto = proto;
644 lp->outgoing.skb = skb;
645 lp->outgoing.pkt = pkt;
646
647 freeskb = 0;
648
649 if (proto->continue_tx &&
650 proto->continue_tx(dev, txbuf)) {
651 BUGMSG(D_NORMAL,
652 "bug! continue_tx finished the first time! "
653 "(proto='%c')\n", proto->suffix);
654 }
655 }
656 retval = NETDEV_TX_OK;
657 lp->next_tx = txbuf;
658 } else {
659 retval = NETDEV_TX_BUSY;
660 freeskb = 0;
661 }
662
663 BUGMSG(D_DEBUG, "%s: %d: %s, status: %x\n",__FILE__,__LINE__,__func__,ASTATUS());
664
665 AINTMASK(0);
666
667 BUGMSG(D_DEBUG, "%s: %d: %s\n",__FILE__,__LINE__,__func__);
668 lp->intmask |= TXFREEflag|EXCNAKflag;
669 AINTMASK(lp->intmask);
670 BUGMSG(D_DEBUG, "%s: %d: %s, status: %x\n",__FILE__,__LINE__,__func__,ASTATUS());
671
672 spin_unlock_irqrestore(&lp->lock, flags);
673 if (freeskb) {
674 dev_kfree_skb(skb);
675 }
676 return retval;
677}
678
679
680
681
682
683
684static int go_tx(struct net_device *dev)
685{
686 struct arcnet_local *lp = netdev_priv(dev);
687
688 BUGMSG(D_DURING, "go_tx: status=%Xh, intmask=%Xh, next_tx=%d, cur_tx=%d\n",
689 ASTATUS(), lp->intmask, lp->next_tx, lp->cur_tx);
690
691 if (lp->cur_tx != -1 || lp->next_tx == -1)
692 return 0;
693
694 BUGLVL(D_TX) arcnet_dump_packet(dev, lp->next_tx, "go_tx", 0);
695
696 lp->cur_tx = lp->next_tx;
697 lp->next_tx = -1;
698
699
700 ACOMMAND(TXcmd | (lp->cur_tx << 3));
701
702 dev->stats.tx_packets++;
703 lp->lasttrans_dest = lp->lastload_dest;
704 lp->lastload_dest = 0;
705 lp->excnak_pending = 0;
706 lp->intmask |= TXFREEflag|EXCNAKflag;
707
708 return 1;
709}
710
711
712
713void arcnet_timeout(struct net_device *dev)
714{
715 unsigned long flags;
716 struct arcnet_local *lp = netdev_priv(dev);
717 int status = ASTATUS();
718 char *msg;
719
720 spin_lock_irqsave(&lp->lock, flags);
721 if (status & TXFREEflag) {
722 msg = " - missed IRQ?";
723 } else {
724 msg = "";
725 dev->stats.tx_aborted_errors++;
726 lp->timed_out = 1;
727 ACOMMAND(NOTXcmd | (lp->cur_tx << 3));
728 }
729 dev->stats.tx_errors++;
730
731
732 AINTMASK(0);
733 lp->intmask |= TXFREEflag|EXCNAKflag;
734 AINTMASK(lp->intmask);
735
736 spin_unlock_irqrestore(&lp->lock, flags);
737
738 if (time_after(jiffies, lp->last_timeout + 10*HZ)) {
739 BUGMSG(D_EXTRA, "tx timed out%s (status=%Xh, intmask=%Xh, dest=%02Xh)\n",
740 msg, status, lp->intmask, lp->lasttrans_dest);
741 lp->last_timeout = jiffies;
742 }
743
744 if (lp->cur_tx == -1)
745 netif_wake_queue(dev);
746}
747
748
749
750
751
752
753
754irqreturn_t arcnet_interrupt(int irq, void *dev_id)
755{
756 struct net_device *dev = dev_id;
757 struct arcnet_local *lp;
758 int recbuf, status, diagstatus, didsomething, boguscount;
759 int retval = IRQ_NONE;
760
761 BUGMSG(D_DURING, "\n");
762
763 BUGMSG(D_DURING, "in arcnet_interrupt\n");
764
765 lp = netdev_priv(dev);
766 BUG_ON(!lp);
767
768 spin_lock(&lp->lock);
769
770
771
772
773
774 if (!netif_running(dev)) {
775 if (ASTATUS() & RESETflag)
776 ACOMMAND(CFLAGScmd | RESETclear);
777 AINTMASK(0);
778 spin_unlock(&lp->lock);
779 return IRQ_HANDLED;
780 }
781
782 BUGMSG(D_DURING, "in arcnet_inthandler (status=%Xh, intmask=%Xh)\n",
783 ASTATUS(), lp->intmask);
784
785 boguscount = 5;
786 do {
787 status = ASTATUS();
788 diagstatus = (status >> 8) & 0xFF;
789
790 BUGMSG(D_DEBUG, "%s: %d: %s: status=%x\n",
791 __FILE__,__LINE__,__func__,status);
792 didsomething = 0;
793
794
795
796
797
798
799
800 if (status & RESETflag) {
801 BUGMSG(D_NORMAL, "spurious reset (status=%Xh)\n", status);
802 arcnet_close(dev);
803 arcnet_open(dev);
804
805
806 break;
807 }
808
809
810
811
812
813
814
815
816
817 recbuf = -1;
818 if (status & lp->intmask & NORXflag) {
819 recbuf = lp->cur_rx;
820 BUGMSG(D_DURING, "Buffer #%d: receive irq (status=%Xh)\n",
821 recbuf, status);
822
823 lp->cur_rx = get_arcbuf(dev);
824 if (lp->cur_rx != -1) {
825 BUGMSG(D_DURING, "enabling receive to buffer #%d\n",
826 lp->cur_rx);
827 ACOMMAND(RXcmd | (lp->cur_rx << 3) | RXbcasts);
828 }
829 didsomething++;
830 }
831
832 if((diagstatus & EXCNAKflag)) {
833 BUGMSG(D_DURING, "EXCNAK IRQ (diagstat=%Xh)\n",
834 diagstatus);
835
836 ACOMMAND(NOTXcmd);
837 lp->excnak_pending = 1;
838
839 ACOMMAND(EXCNAKclear);
840 lp->intmask &= ~(EXCNAKflag);
841 didsomething++;
842 }
843
844
845
846 if ((status & lp->intmask & TXFREEflag) || lp->timed_out) {
847 lp->intmask &= ~(TXFREEflag|EXCNAKflag);
848
849 BUGMSG(D_DURING, "TX IRQ (stat=%Xh)\n", status);
850
851 if (lp->cur_tx != -1 && !lp->timed_out) {
852 if(!(status & TXACKflag)) {
853 if (lp->lasttrans_dest != 0) {
854 BUGMSG(D_EXTRA,
855 "transmit was not acknowledged! "
856 "(status=%Xh, dest=%02Xh)\n",
857 status, lp->lasttrans_dest);
858 dev->stats.tx_errors++;
859 dev->stats.tx_carrier_errors++;
860 } else {
861 BUGMSG(D_DURING,
862 "broadcast was not acknowledged; that's normal "
863 "(status=%Xh, dest=%02Xh)\n",
864 status, lp->lasttrans_dest);
865 }
866 }
867
868 if (lp->outgoing.proto &&
869 lp->outgoing.proto->ack_tx) {
870 int ackstatus;
871 if(status & TXACKflag)
872 ackstatus=2;
873 else if(lp->excnak_pending)
874 ackstatus=1;
875 else
876 ackstatus=0;
877
878 lp->outgoing.proto
879 ->ack_tx(dev, ackstatus);
880 }
881 }
882 if (lp->cur_tx != -1)
883 release_arcbuf(dev, lp->cur_tx);
884
885 lp->cur_tx = -1;
886 lp->timed_out = 0;
887 didsomething++;
888
889
890 go_tx(dev);
891
892
893 if (lp->outgoing.proto && lp->outgoing.proto->continue_tx) {
894 int txbuf = get_arcbuf(dev);
895 if (txbuf != -1) {
896 if (lp->outgoing.proto->continue_tx(dev, txbuf)) {
897
898 dev->stats.tx_bytes += lp->outgoing.skb->len;
899 if(!lp->outgoing.proto->ack_tx)
900 {
901 dev_kfree_skb_irq(lp->outgoing.skb);
902 lp->outgoing.proto = NULL;
903 }
904 }
905 lp->next_tx = txbuf;
906 }
907 }
908
909 if (lp->cur_tx == -1)
910 netif_wake_queue(dev);
911 }
912
913 if (recbuf != -1) {
914 BUGLVL(D_RX) arcnet_dump_packet(dev, recbuf, "rx irq", 0);
915
916 arcnet_rx(dev, recbuf);
917 release_arcbuf(dev, recbuf);
918
919 didsomething++;
920 }
921 if (status & lp->intmask & RECONflag) {
922 ACOMMAND(CFLAGScmd | CONFIGclear);
923 dev->stats.tx_carrier_errors++;
924
925 BUGMSG(D_RECON, "Network reconfiguration detected (status=%Xh)\n",
926 status);
927
928 if(diagstatus & 0x80)
929 BUGMSG(D_RECON,"Put out that recon myself\n");
930
931
932 if (!lp->first_recon || !lp->last_recon ||
933 time_after(jiffies, lp->last_recon + HZ * 10)) {
934 if (lp->network_down)
935 BUGMSG(D_NORMAL, "reconfiguration detected: cabling restored?\n");
936 lp->first_recon = lp->last_recon = jiffies;
937 lp->num_recons = lp->network_down = 0;
938
939 BUGMSG(D_DURING, "recon: clearing counters.\n");
940 } else {
941 lp->last_recon = jiffies;
942 lp->num_recons++;
943
944 BUGMSG(D_DURING, "recon: counter=%d, time=%lds, net=%d\n",
945 lp->num_recons,
946 (lp->last_recon - lp->first_recon) / HZ,
947 lp->network_down);
948
949
950
951
952
953
954
955 if (!lp->network_down &&
956 (lp->last_recon - lp->first_recon) <= HZ * 60 &&
957 lp->num_recons >= RECON_THRESHOLD) {
958 lp->network_down = 1;
959 BUGMSG(D_NORMAL, "many reconfigurations detected: cabling problem?\n");
960 } else if (!lp->network_down &&
961 lp->last_recon - lp->first_recon > HZ * 60) {
962
963 lp->first_recon = lp->last_recon;
964 lp->num_recons = 1;
965 }
966 }
967 } else if (lp->network_down &&
968 time_after(jiffies, lp->last_recon + HZ * 10)) {
969 if (lp->network_down)
970 BUGMSG(D_NORMAL, "cabling restored?\n");
971 lp->first_recon = lp->last_recon = 0;
972 lp->num_recons = lp->network_down = 0;
973
974 BUGMSG(D_DURING, "not recon: clearing counters anyway.\n");
975 }
976
977 if(didsomething) {
978 retval |= IRQ_HANDLED;
979 }
980 }
981 while (--boguscount && didsomething);
982
983 BUGMSG(D_DURING, "arcnet_interrupt complete (status=%Xh, count=%d)\n",
984 ASTATUS(), boguscount);
985 BUGMSG(D_DURING, "\n");
986
987
988 AINTMASK(0);
989 udelay(1);
990 AINTMASK(lp->intmask);
991
992 spin_unlock(&lp->lock);
993 return retval;
994}
995
996
997
998
999
1000
1001static void arcnet_rx(struct net_device *dev, int bufnum)
1002{
1003 struct arcnet_local *lp = netdev_priv(dev);
1004 struct archdr pkt;
1005 struct arc_rfc1201 *soft;
1006 int length, ofs;
1007
1008 soft = &pkt.soft.rfc1201;
1009
1010 lp->hw.copy_from_card(dev, bufnum, 0, &pkt, ARC_HDR_SIZE);
1011 if (pkt.hard.offset[0]) {
1012 ofs = pkt.hard.offset[0];
1013 length = 256 - ofs;
1014 } else {
1015 ofs = pkt.hard.offset[1];
1016 length = 512 - ofs;
1017 }
1018
1019
1020 if (sizeof(pkt.soft) <= length)
1021 lp->hw.copy_from_card(dev, bufnum, ofs, soft, sizeof(pkt.soft));
1022 else {
1023 memset(&pkt.soft, 0, sizeof(pkt.soft));
1024 lp->hw.copy_from_card(dev, bufnum, ofs, soft, length);
1025 }
1026
1027 BUGMSG(D_DURING, "Buffer #%d: received packet from %02Xh to %02Xh "
1028 "(%d+4 bytes)\n",
1029 bufnum, pkt.hard.source, pkt.hard.dest, length);
1030
1031 dev->stats.rx_packets++;
1032 dev->stats.rx_bytes += length + ARC_HDR_SIZE;
1033
1034
1035 if (arc_proto_map[soft->proto]->is_ip) {
1036 BUGLVL(D_PROTO) {
1037 struct ArcProto
1038 *oldp = arc_proto_map[lp->default_proto[pkt.hard.source]],
1039 *newp = arc_proto_map[soft->proto];
1040
1041 if (oldp != newp) {
1042 BUGMSG(D_PROTO,
1043 "got protocol %02Xh; encap for host %02Xh is now '%c'"
1044 " (was '%c')\n", soft->proto, pkt.hard.source,
1045 newp->suffix, oldp->suffix);
1046 }
1047 }
1048
1049
1050 lp->default_proto[0] = soft->proto;
1051
1052
1053 lp->default_proto[pkt.hard.source] = soft->proto;
1054 }
1055
1056 arc_proto_map[soft->proto]->rx(dev, bufnum, &pkt, length);
1057}
1058
1059
1060static void null_rx(struct net_device *dev, int bufnum,
1061 struct archdr *pkthdr, int length)
1062{
1063 BUGMSG(D_PROTO,
1064 "rx: don't know how to deal with proto %02Xh from host %02Xh.\n",
1065 pkthdr->soft.rfc1201.proto, pkthdr->hard.source);
1066}
1067
1068
1069static int null_build_header(struct sk_buff *skb, struct net_device *dev,
1070 unsigned short type, uint8_t daddr)
1071{
1072 struct arcnet_local *lp = netdev_priv(dev);
1073
1074 BUGMSG(D_PROTO,
1075 "tx: can't build header for encap %02Xh; load a protocol driver.\n",
1076 lp->default_proto[daddr]);
1077
1078
1079 return 0;
1080}
1081
1082
1083
1084static int null_prepare_tx(struct net_device *dev, struct archdr *pkt,
1085 int length, int bufnum)
1086{
1087 struct arcnet_local *lp = netdev_priv(dev);
1088 struct arc_hardware newpkt;
1089
1090 BUGMSG(D_PROTO, "tx: no encap for this host; load a protocol driver.\n");
1091
1092
1093 newpkt.source = newpkt.dest = dev->dev_addr[0];
1094
1095
1096 newpkt.offset[0] = 0xFF;
1097
1098 lp->hw.copy_to_card(dev, bufnum, 0, &newpkt, ARC_HDR_SIZE);
1099
1100 return 1;
1101}
1102