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1/*
2 * Linux ARCnet driver - device-independent routines
3 *
4 * Written 1997 by David Woodhouse.
5 * Written 1994-1999 by Avery Pennarun.
6 * Written 1999-2000 by Martin Mares <mj@ucw.cz>.
7 * Derived from skeleton.c by Donald Becker.
8 *
9 * Special thanks to Contemporary Controls, Inc. (www.ccontrols.com)
10 * for sponsoring the further development of this driver.
11 *
12 * **********************
13 *
14 * The original copyright was as follows:
15 *
16 * skeleton.c Written 1993 by Donald Becker.
17 * Copyright 1993 United States Government as represented by the
18 * Director, National Security Agency. This software may only be used
19 * and distributed according to the terms of the GNU General Public License as
20 * modified by SRC, incorporated herein by reference.
21 *
22 * **********************
23 *
24 * The change log is now in a file called ChangeLog in this directory.
25 *
26 * Sources:
27 * - Crynwr arcnet.com/arcether.com packet drivers.
28 * - arcnet.c v0.00 dated 1/1/94 and apparently by
29 * Donald Becker - it didn't work :)
30 * - skeleton.c v0.05 dated 11/16/93 by Donald Becker
31 * (from Linux Kernel 1.1.45)
32 * - RFC's 1201 and 1051 - re: TCP/IP over ARCnet
33 * - The official ARCnet COM9026 data sheets (!) thanks to
34 * Ken Cornetet <kcornete@nyx10.cs.du.edu>
35 * - The official ARCnet COM20020 data sheets.
36 * - Information on some more obscure ARCnet controller chips, thanks
37 * to the nice people at SMSC.
38 * - net/inet/eth.c (from kernel 1.1.50) for header-building info.
39 * - Alternate Linux ARCnet source by V.Shergin <vsher@sao.stavropol.su>
40 * - Textual information and more alternate source from Joachim Koenig
41 * <jojo@repas.de>
42 */
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/* "do nothing" functions for protocol drivers */
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 * one ArcProto per possible proto ID. None of the elements of
68 * arc_proto_map are allowed to be NULL; they will get set to
69 * arc_proto_default instead. It also must not be NULL; if you would like
70 * to set it to NULL, set it to &arc_proto_null instead.
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/* Exported function prototypes */
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/* Internal function prototypes */
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 /* initialize the protocol map */
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 * Dump the contents of an sk_buff
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 /* dump the packet */
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 * Dump the contents of an ARCnet buffer
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 /* hw.copy_from_card expects IRQ context so take the IRQ lock
187 to keep it single threaded */
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 /* if the offset[0] byte is nonzero, this is a 256-byte packet */
196 length = (buf[2] ? 256 : 512);
197
198 /* dump the packet */
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 * Unregister a protocol driver from the arc_proto_map. Protocol drivers
213 * are responsible for registering themselves, but the unregister routine
214 * is pretty generic so we'll do it here.
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 * Add a buffer to the queue. Only the interrupt handler is allowed to do
236 * this, unless interrupts are disabled.
237 *
238 * Note: we don't check for a full queue, since there aren't enough buffers
239 * to more than fill it.
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 * Get a buffer from the queue. If this returns -1, there are no buffers
261 * available.
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 /* already in this function */
270 BUGMSG(D_NORMAL, "get_arcbuf: overlap (%d)!\n",
271 lp->buf_lock.counter);
272 }
273 else { /* we can continue */
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 /* choose the smallest MTU of all available encaps */
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/* Setup a struct device for ARCnet. */
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; /* for us, broadcasts are address 0 */
337 dev->watchdog_timeo = TX_TIMEOUT;
338
339 /* New-style flags. */
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 * Open/initialize the board. This is called sometime after booting when
360 * the 'ifconfig' program is run.
361 *
362 * This routine should set everything up anew at each open, even registers
363 * that "should" only need to be set once at boot, so that there is
364 * non-reboot way to recover if something goes wrong.
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 /* try to put the card in a defined state - if it fails the first
388 * time, actually reset it.
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 /* autodetect the encapsulation for each host. */
401 memset(lp->default_proto, 0, sizeof(lp->default_proto));
402
403 /* the broadcast address is special - use the 'bcast' protocol */
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 /* initialize buffers */
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 /* bring up the hardware driver */
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 /* make sure we're ready to receive IRQ's. */
444 AINTMASK(0);
445 udelay(1); /* give it time to set the mask before
446 * we reset it again. (may not even be
447 * necessary)
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/* The inverse routine to arcnet_open - shuts down the card. */
465int arcnet_close(struct net_device *dev)
466{
467 struct arcnet_local *lp = netdev_priv(dev);
468
469 netif_stop_queue(dev);
470
471 /* flush TX and disable RX */
472 AINTMASK(0);
473 ACOMMAND(NOTXcmd); /* stop transmit */
474 ACOMMAND(NORXcmd); /* disable receive */
475 mdelay(1);
476
477 /* shut down the card */
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 /* Type is host order - ? */
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 * if the dest addr isn't provided, we can't choose an encapsulation!
512 * Store the packet type (eg. ETH_P_IP) for now, and we'll push on a
513 * real header when we do rebuild_header.
514 */
515 *(uint16_t *) skb_push(skb, 2) = type;
516 /*
517 * XXX: Why not use skb->mac_len?
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; /* return error -- can't transmit yet! */
523 }
524 else {
525 /* otherwise, we can just add the header as usual. */
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 * Rebuild the ARCnet hard header. This is called after an ARP (or in the
543 * future other address resolution) has completed on this sk_buff. We now
544 * let ARP fill in the destination field.
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; /* default is failure */
551 unsigned short type;
552 uint8_t daddr=0;
553 struct ArcProto *proto;
554 /*
555 * XXX: Why not use skb->mac_len?
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 /* if we couldn't resolve the address... give up. */
581 if (!status)
582 return 0;
583
584 /* add the _real_ header this time! */
585 proto = arc_proto_map[lp->default_proto[daddr]];
586 proto->build_header(skb, dev, type, daddr);
587
588 return 1; /* success */
589}
590
591
592
593/* Called by the kernel in order to transmit a packet. */
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 /* fits in one packet? */
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; /* don't try again */
622 }
623
624 /* We're busy transmitting a packet... */
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 /* done right away and we don't want to acknowledge
638 the package later - forget about it now */
639 dev->stats.tx_bytes += skb->len;
640 freeskb = 1;
641 } else {
642 /* do it the 'split' way */
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 /* make sure we didn't ignore a TX IRQ while we were in here */
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; /* no need to try again */
677}
678
679
680/*
681 * Actually start transmitting a packet that was loaded into a buffer
682 * by prepare_tx. This should _only_ be called by the interrupt handler.
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 /* start sending */
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/* Called by the kernel when transmit times out */
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) { /* transmit _DID_ finish */
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 /* make sure we didn't miss a TX or a EXC NAK IRQ */
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 * The typical workload of the driver: Handle the network interface
751 * interrupts. Establish which device needs attention, and call the correct
752 * chipset interrupt handler.
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 * RESET flag was enabled - if device is not running, we must clear it right
772 * away (but nothing else).
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 * RESET flag was enabled - card is resetting and if RX is
796 * disabled, it's NOT because we just got a packet.
797 *
798 * The card is in an undefined state. Clear it out and start over.
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 /* get out of the interrupt handler! */
806 break;
807 }
808 /*
809 * RX is inhibited - we must have received something. Prepare to
810 * receive into the next buffer.
811 *
812 * We don't actually copy the received packet from the card until
813 * after the transmit handler runs (and possibly launches the next
814 * tx); this should improve latency slightly if we get both types
815 * of interrupts at once.
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); /* disable transmit */
837 lp->excnak_pending = 1;
838
839 ACOMMAND(EXCNAKclear);
840 lp->intmask &= ~(EXCNAKflag);
841 didsomething++;
842 }
843
844
845 /* a transmit finished, and we're interested in it. */
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 /* send another packet if there is one */
890 go_tx(dev);
891
892 /* continue a split packet, if any */
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 /* that was the last segment */
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 /* inform upper layers of idleness, if necessary */
909 if (lp->cur_tx == -1)
910 netif_wake_queue(dev);
911 }
912 /* now process the received packet, if any */
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 /* MYRECON bit is at bit 7 of diagstatus */
928 if(diagstatus & 0x80)
929 BUGMSG(D_RECON,"Put out that recon myself\n");
930
931 /* is the RECON info empty or old? */
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 { /* add to current RECON counter */
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 /* if network is marked up;
950 * and first_recon and last_recon are 60+ apart;
951 * and the average no. of recons counted is
952 * > RECON_THRESHOLD/min;
953 * then print a warning message.
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 /* reset counters if we've gone for over a minute. */
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 * This is a generic packet receiver that calls arcnet??_rx depending on the
999 * protocol ID found.
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, sizeof(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 /* get the full header, if possible */
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 /* call the right receiver for the protocol */
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 /* broadcasts will always be done with the last-used encap. */
1050 lp->default_proto[0] = soft->proto;
1051
1052 /* in striking contrast, the following isn't a hack. */
1053 lp->default_proto[pkt.hard.source] = soft->proto;
1054 }
1055 /* call the protocol-specific receiver. */
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 /* always fails */
1079 return 0;
1080}
1081
1082
1083/* the "do nothing" prepare_tx function warns that there's nothing to do. */
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 /* send a packet to myself -- will never get received, of course */
1093 newpkt.source = newpkt.dest = dev->dev_addr[0];
1094
1095 /* only one byte of actual data (and it's random) */
1096 newpkt.offset[0] = 0xFF;
1097
1098 lp->hw.copy_to_card(dev, bufnum, 0, &newpkt, ARC_HDR_SIZE);
1099
1100 return 1; /* done */
1101}
1/*
2 * Linux ARCnet driver - device-independent routines
3 *
4 * Written 1997 by David Woodhouse.
5 * Written 1994-1999 by Avery Pennarun.
6 * Written 1999-2000 by Martin Mares <mj@ucw.cz>.
7 * Derived from skeleton.c by Donald Becker.
8 *
9 * Special thanks to Contemporary Controls, Inc. (www.ccontrols.com)
10 * for sponsoring the further development of this driver.
11 *
12 * **********************
13 *
14 * The original copyright was as follows:
15 *
16 * skeleton.c Written 1993 by Donald Becker.
17 * Copyright 1993 United States Government as represented by the
18 * Director, National Security Agency. This software may only be used
19 * and distributed according to the terms of the GNU General Public License as
20 * modified by SRC, incorporated herein by reference.
21 *
22 * **********************
23 *
24 * The change log is now in a file called ChangeLog in this directory.
25 *
26 * Sources:
27 * - Crynwr arcnet.com/arcether.com packet drivers.
28 * - arcnet.c v0.00 dated 1/1/94 and apparently by
29 * Donald Becker - it didn't work :)
30 * - skeleton.c v0.05 dated 11/16/93 by Donald Becker
31 * (from Linux Kernel 1.1.45)
32 * - RFC's 1201 and 1051 - re: TCP/IP over ARCnet
33 * - The official ARCnet COM9026 data sheets (!) thanks to
34 * Ken Cornetet <kcornete@nyx10.cs.du.edu>
35 * - The official ARCnet COM20020 data sheets.
36 * - Information on some more obscure ARCnet controller chips, thanks
37 * to the nice people at SMSC.
38 * - net/inet/eth.c (from kernel 1.1.50) for header-building info.
39 * - Alternate Linux ARCnet source by V.Shergin <vsher@sao.stavropol.su>
40 * - Textual information and more alternate source from Joachim Koenig
41 * <jojo@repas.de>
42 */
43
44#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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/jiffies.h>
54
55#include <linux/leds.h>
56
57#include "arcdevice.h"
58#include "com9026.h"
59
60/* "do nothing" functions for protocol drivers */
61static void null_rx(struct net_device *dev, int bufnum,
62 struct archdr *pkthdr, int length);
63static int null_build_header(struct sk_buff *skb, struct net_device *dev,
64 unsigned short type, uint8_t daddr);
65static int null_prepare_tx(struct net_device *dev, struct archdr *pkt,
66 int length, int bufnum);
67
68static void arcnet_rx(struct net_device *dev, int bufnum);
69
70/* one ArcProto per possible proto ID. None of the elements of
71 * arc_proto_map are allowed to be NULL; they will get set to
72 * arc_proto_default instead. It also must not be NULL; if you would like
73 * to set it to NULL, set it to &arc_proto_null instead.
74 */
75struct ArcProto *arc_proto_map[256];
76EXPORT_SYMBOL(arc_proto_map);
77
78struct ArcProto *arc_proto_default;
79EXPORT_SYMBOL(arc_proto_default);
80
81struct ArcProto *arc_bcast_proto;
82EXPORT_SYMBOL(arc_bcast_proto);
83
84struct ArcProto *arc_raw_proto;
85EXPORT_SYMBOL(arc_raw_proto);
86
87static struct ArcProto arc_proto_null = {
88 .suffix = '?',
89 .mtu = XMTU,
90 .is_ip = 0,
91 .rx = null_rx,
92 .build_header = null_build_header,
93 .prepare_tx = null_prepare_tx,
94 .continue_tx = NULL,
95 .ack_tx = NULL
96};
97
98/* Exported function prototypes */
99int arcnet_debug = ARCNET_DEBUG;
100EXPORT_SYMBOL(arcnet_debug);
101
102/* Internal function prototypes */
103static int arcnet_header(struct sk_buff *skb, struct net_device *dev,
104 unsigned short type, const void *daddr,
105 const void *saddr, unsigned len);
106static int go_tx(struct net_device *dev);
107
108static int debug = ARCNET_DEBUG;
109module_param(debug, int, 0);
110MODULE_LICENSE("GPL");
111
112static int __init arcnet_init(void)
113{
114 int count;
115
116 arcnet_debug = debug;
117
118 pr_info("arcnet loaded\n");
119
120 /* initialize the protocol map */
121 arc_raw_proto = arc_proto_default = arc_bcast_proto = &arc_proto_null;
122 for (count = 0; count < 256; count++)
123 arc_proto_map[count] = arc_proto_default;
124
125 if (BUGLVL(D_DURING))
126 pr_info("struct sizes: %Zd %Zd %Zd %Zd %Zd\n",
127 sizeof(struct arc_hardware),
128 sizeof(struct arc_rfc1201),
129 sizeof(struct arc_rfc1051),
130 sizeof(struct arc_eth_encap),
131 sizeof(struct archdr));
132
133 return 0;
134}
135
136static void __exit arcnet_exit(void)
137{
138}
139
140module_init(arcnet_init);
141module_exit(arcnet_exit);
142
143/* Dump the contents of an sk_buff */
144#if ARCNET_DEBUG_MAX & D_SKB
145void arcnet_dump_skb(struct net_device *dev,
146 struct sk_buff *skb, char *desc)
147{
148 char hdr[32];
149
150 /* dump the packet */
151 snprintf(hdr, sizeof(hdr), "%6s:%s skb->data:", dev->name, desc);
152 print_hex_dump(KERN_DEBUG, hdr, DUMP_PREFIX_OFFSET,
153 16, 1, skb->data, skb->len, true);
154}
155EXPORT_SYMBOL(arcnet_dump_skb);
156#endif
157
158/* Dump the contents of an ARCnet buffer */
159#if (ARCNET_DEBUG_MAX & (D_RX | D_TX))
160static void arcnet_dump_packet(struct net_device *dev, int bufnum,
161 char *desc, int take_arcnet_lock)
162{
163 struct arcnet_local *lp = netdev_priv(dev);
164 int i, length;
165 unsigned long flags = 0;
166 static uint8_t buf[512];
167 char hdr[32];
168
169 /* hw.copy_from_card expects IRQ context so take the IRQ lock
170 * to keep it single threaded
171 */
172 if (take_arcnet_lock)
173 spin_lock_irqsave(&lp->lock, flags);
174
175 lp->hw.copy_from_card(dev, bufnum, 0, buf, 512);
176 if (take_arcnet_lock)
177 spin_unlock_irqrestore(&lp->lock, flags);
178
179 /* if the offset[0] byte is nonzero, this is a 256-byte packet */
180 length = (buf[2] ? 256 : 512);
181
182 /* dump the packet */
183 snprintf(hdr, sizeof(hdr), "%6s:%s packet dump:", dev->name, desc);
184 print_hex_dump(KERN_DEBUG, hdr, DUMP_PREFIX_OFFSET,
185 16, 1, buf, length, true);
186}
187
188#else
189
190#define arcnet_dump_packet(dev, bufnum, desc, take_arcnet_lock) do { } while (0)
191
192#endif
193
194/* Trigger a LED event in response to a ARCNET device event */
195void arcnet_led_event(struct net_device *dev, enum arcnet_led_event event)
196{
197 struct arcnet_local *lp = netdev_priv(dev);
198 unsigned long led_delay = 350;
199 unsigned long tx_delay = 50;
200
201 switch (event) {
202 case ARCNET_LED_EVENT_RECON:
203 led_trigger_blink_oneshot(lp->recon_led_trig,
204 &led_delay, &led_delay, 0);
205 break;
206 case ARCNET_LED_EVENT_OPEN:
207 led_trigger_event(lp->tx_led_trig, LED_OFF);
208 led_trigger_event(lp->recon_led_trig, LED_OFF);
209 break;
210 case ARCNET_LED_EVENT_STOP:
211 led_trigger_event(lp->tx_led_trig, LED_OFF);
212 led_trigger_event(lp->recon_led_trig, LED_OFF);
213 break;
214 case ARCNET_LED_EVENT_TX:
215 led_trigger_blink_oneshot(lp->tx_led_trig,
216 &tx_delay, &tx_delay, 0);
217 break;
218 }
219}
220EXPORT_SYMBOL_GPL(arcnet_led_event);
221
222static void arcnet_led_release(struct device *gendev, void *res)
223{
224 struct arcnet_local *lp = netdev_priv(to_net_dev(gendev));
225
226 led_trigger_unregister_simple(lp->tx_led_trig);
227 led_trigger_unregister_simple(lp->recon_led_trig);
228}
229
230/* Register ARCNET LED triggers for a arcnet device
231 *
232 * This is normally called from a driver's probe function
233 */
234void devm_arcnet_led_init(struct net_device *netdev, int index, int subid)
235{
236 struct arcnet_local *lp = netdev_priv(netdev);
237 void *res;
238
239 res = devres_alloc(arcnet_led_release, 0, GFP_KERNEL);
240 if (!res) {
241 netdev_err(netdev, "cannot register LED triggers\n");
242 return;
243 }
244
245 snprintf(lp->tx_led_trig_name, sizeof(lp->tx_led_trig_name),
246 "arc%d-%d-tx", index, subid);
247 snprintf(lp->recon_led_trig_name, sizeof(lp->recon_led_trig_name),
248 "arc%d-%d-recon", index, subid);
249
250 led_trigger_register_simple(lp->tx_led_trig_name,
251 &lp->tx_led_trig);
252 led_trigger_register_simple(lp->recon_led_trig_name,
253 &lp->recon_led_trig);
254
255 devres_add(&netdev->dev, res);
256}
257EXPORT_SYMBOL_GPL(devm_arcnet_led_init);
258
259/* Unregister a protocol driver from the arc_proto_map. Protocol drivers
260 * are responsible for registering themselves, but the unregister routine
261 * is pretty generic so we'll do it here.
262 */
263void arcnet_unregister_proto(struct ArcProto *proto)
264{
265 int count;
266
267 if (arc_proto_default == proto)
268 arc_proto_default = &arc_proto_null;
269 if (arc_bcast_proto == proto)
270 arc_bcast_proto = arc_proto_default;
271 if (arc_raw_proto == proto)
272 arc_raw_proto = arc_proto_default;
273
274 for (count = 0; count < 256; count++) {
275 if (arc_proto_map[count] == proto)
276 arc_proto_map[count] = arc_proto_default;
277 }
278}
279EXPORT_SYMBOL(arcnet_unregister_proto);
280
281/* Add a buffer to the queue. Only the interrupt handler is allowed to do
282 * this, unless interrupts are disabled.
283 *
284 * Note: we don't check for a full queue, since there aren't enough buffers
285 * to more than fill it.
286 */
287static void release_arcbuf(struct net_device *dev, int bufnum)
288{
289 struct arcnet_local *lp = netdev_priv(dev);
290 int i;
291
292 lp->buf_queue[lp->first_free_buf++] = bufnum;
293 lp->first_free_buf %= 5;
294
295 if (BUGLVL(D_DURING)) {
296 arc_printk(D_DURING, dev, "release_arcbuf: freed #%d; buffer queue is now: ",
297 bufnum);
298 for (i = lp->next_buf; i != lp->first_free_buf; i = (i + 1) % 5)
299 arc_cont(D_DURING, "#%d ", lp->buf_queue[i]);
300 arc_cont(D_DURING, "\n");
301 }
302}
303
304/* Get a buffer from the queue.
305 * If this returns -1, there are no buffers available.
306 */
307static int get_arcbuf(struct net_device *dev)
308{
309 struct arcnet_local *lp = netdev_priv(dev);
310 int buf = -1, i;
311
312 if (!atomic_dec_and_test(&lp->buf_lock)) {
313 /* already in this function */
314 arc_printk(D_NORMAL, dev, "get_arcbuf: overlap (%d)!\n",
315 lp->buf_lock.counter);
316 } else { /* we can continue */
317 if (lp->next_buf >= 5)
318 lp->next_buf -= 5;
319
320 if (lp->next_buf == lp->first_free_buf) {
321 arc_printk(D_NORMAL, dev, "get_arcbuf: BUG: no buffers are available??\n");
322 } else {
323 buf = lp->buf_queue[lp->next_buf++];
324 lp->next_buf %= 5;
325 }
326 }
327
328 if (BUGLVL(D_DURING)) {
329 arc_printk(D_DURING, dev, "get_arcbuf: got #%d; buffer queue is now: ",
330 buf);
331 for (i = lp->next_buf; i != lp->first_free_buf; i = (i + 1) % 5)
332 arc_cont(D_DURING, "#%d ", lp->buf_queue[i]);
333 arc_cont(D_DURING, "\n");
334 }
335
336 atomic_inc(&lp->buf_lock);
337 return buf;
338}
339
340static int choose_mtu(void)
341{
342 int count, mtu = 65535;
343
344 /* choose the smallest MTU of all available encaps */
345 for (count = 0; count < 256; count++) {
346 if (arc_proto_map[count] != &arc_proto_null &&
347 arc_proto_map[count]->mtu < mtu) {
348 mtu = arc_proto_map[count]->mtu;
349 }
350 }
351
352 return mtu == 65535 ? XMTU : mtu;
353}
354
355static const struct header_ops arcnet_header_ops = {
356 .create = arcnet_header,
357};
358
359static const struct net_device_ops arcnet_netdev_ops = {
360 .ndo_open = arcnet_open,
361 .ndo_stop = arcnet_close,
362 .ndo_start_xmit = arcnet_send_packet,
363 .ndo_tx_timeout = arcnet_timeout,
364};
365
366/* Setup a struct device for ARCnet. */
367static void arcdev_setup(struct net_device *dev)
368{
369 dev->type = ARPHRD_ARCNET;
370 dev->netdev_ops = &arcnet_netdev_ops;
371 dev->header_ops = &arcnet_header_ops;
372 dev->hard_header_len = sizeof(struct arc_hardware);
373 dev->mtu = choose_mtu();
374
375 dev->addr_len = ARCNET_ALEN;
376 dev->tx_queue_len = 100;
377 dev->broadcast[0] = 0x00; /* for us, broadcasts are address 0 */
378 dev->watchdog_timeo = TX_TIMEOUT;
379
380 /* New-style flags. */
381 dev->flags = IFF_BROADCAST;
382}
383
384static void arcnet_timer(unsigned long data)
385{
386 struct net_device *dev = (struct net_device *)data;
387
388 if (!netif_carrier_ok(dev)) {
389 netif_carrier_on(dev);
390 netdev_info(dev, "link up\n");
391 }
392}
393
394struct net_device *alloc_arcdev(const char *name)
395{
396 struct net_device *dev;
397
398 dev = alloc_netdev(sizeof(struct arcnet_local),
399 name && *name ? name : "arc%d", NET_NAME_UNKNOWN,
400 arcdev_setup);
401 if (dev) {
402 struct arcnet_local *lp = netdev_priv(dev);
403
404 spin_lock_init(&lp->lock);
405 init_timer(&lp->timer);
406 lp->timer.data = (unsigned long) dev;
407 lp->timer.function = arcnet_timer;
408 }
409
410 return dev;
411}
412EXPORT_SYMBOL(alloc_arcdev);
413
414/* Open/initialize the board. This is called sometime after booting when
415 * the 'ifconfig' program is run.
416 *
417 * This routine should set everything up anew at each open, even registers
418 * that "should" only need to be set once at boot, so that there is
419 * non-reboot way to recover if something goes wrong.
420 */
421int arcnet_open(struct net_device *dev)
422{
423 struct arcnet_local *lp = netdev_priv(dev);
424 int count, newmtu, error;
425
426 arc_printk(D_INIT, dev, "opened.");
427
428 if (!try_module_get(lp->hw.owner))
429 return -ENODEV;
430
431 if (BUGLVL(D_PROTO)) {
432 arc_printk(D_PROTO, dev, "protocol map (default is '%c'): ",
433 arc_proto_default->suffix);
434 for (count = 0; count < 256; count++)
435 arc_cont(D_PROTO, "%c", arc_proto_map[count]->suffix);
436 arc_cont(D_PROTO, "\n");
437 }
438
439 arc_printk(D_INIT, dev, "arcnet_open: resetting card.\n");
440
441 /* try to put the card in a defined state - if it fails the first
442 * time, actually reset it.
443 */
444 error = -ENODEV;
445 if (lp->hw.reset(dev, 0) && lp->hw.reset(dev, 1))
446 goto out_module_put;
447
448 newmtu = choose_mtu();
449 if (newmtu < dev->mtu)
450 dev->mtu = newmtu;
451
452 arc_printk(D_INIT, dev, "arcnet_open: mtu: %d.\n", dev->mtu);
453
454 /* autodetect the encapsulation for each host. */
455 memset(lp->default_proto, 0, sizeof(lp->default_proto));
456
457 /* the broadcast address is special - use the 'bcast' protocol */
458 for (count = 0; count < 256; count++) {
459 if (arc_proto_map[count] == arc_bcast_proto) {
460 lp->default_proto[0] = count;
461 break;
462 }
463 }
464
465 /* initialize buffers */
466 atomic_set(&lp->buf_lock, 1);
467
468 lp->next_buf = lp->first_free_buf = 0;
469 release_arcbuf(dev, 0);
470 release_arcbuf(dev, 1);
471 release_arcbuf(dev, 2);
472 release_arcbuf(dev, 3);
473 lp->cur_tx = lp->next_tx = -1;
474 lp->cur_rx = -1;
475
476 lp->rfc1201.sequence = 1;
477
478 /* bring up the hardware driver */
479 if (lp->hw.open)
480 lp->hw.open(dev);
481
482 if (dev->dev_addr[0] == 0)
483 arc_printk(D_NORMAL, dev, "WARNING! Station address 00 is reserved for broadcasts!\n");
484 else if (dev->dev_addr[0] == 255)
485 arc_printk(D_NORMAL, dev, "WARNING! Station address FF may confuse DOS networking programs!\n");
486
487 arc_printk(D_DEBUG, dev, "%s: %d: %s\n", __FILE__, __LINE__, __func__);
488 if (lp->hw.status(dev) & RESETflag) {
489 arc_printk(D_DEBUG, dev, "%s: %d: %s\n",
490 __FILE__, __LINE__, __func__);
491 lp->hw.command(dev, CFLAGScmd | RESETclear);
492 }
493
494 arc_printk(D_DEBUG, dev, "%s: %d: %s\n", __FILE__, __LINE__, __func__);
495 /* make sure we're ready to receive IRQ's. */
496 lp->hw.intmask(dev, 0);
497 udelay(1); /* give it time to set the mask before
498 * we reset it again. (may not even be
499 * necessary)
500 */
501 arc_printk(D_DEBUG, dev, "%s: %d: %s\n", __FILE__, __LINE__, __func__);
502 lp->intmask = NORXflag | RECONflag;
503 lp->hw.intmask(dev, lp->intmask);
504 arc_printk(D_DEBUG, dev, "%s: %d: %s\n", __FILE__, __LINE__, __func__);
505
506 netif_carrier_off(dev);
507 netif_start_queue(dev);
508 mod_timer(&lp->timer, jiffies + msecs_to_jiffies(1000));
509
510 arcnet_led_event(dev, ARCNET_LED_EVENT_OPEN);
511 return 0;
512
513 out_module_put:
514 module_put(lp->hw.owner);
515 return error;
516}
517EXPORT_SYMBOL(arcnet_open);
518
519/* The inverse routine to arcnet_open - shuts down the card. */
520int arcnet_close(struct net_device *dev)
521{
522 struct arcnet_local *lp = netdev_priv(dev);
523
524 arcnet_led_event(dev, ARCNET_LED_EVENT_STOP);
525 del_timer_sync(&lp->timer);
526
527 netif_stop_queue(dev);
528 netif_carrier_off(dev);
529
530 /* flush TX and disable RX */
531 lp->hw.intmask(dev, 0);
532 lp->hw.command(dev, NOTXcmd); /* stop transmit */
533 lp->hw.command(dev, NORXcmd); /* disable receive */
534 mdelay(1);
535
536 /* shut down the card */
537 lp->hw.close(dev);
538 module_put(lp->hw.owner);
539 return 0;
540}
541EXPORT_SYMBOL(arcnet_close);
542
543static int arcnet_header(struct sk_buff *skb, struct net_device *dev,
544 unsigned short type, const void *daddr,
545 const void *saddr, unsigned len)
546{
547 const struct arcnet_local *lp = netdev_priv(dev);
548 uint8_t _daddr, proto_num;
549 struct ArcProto *proto;
550
551 arc_printk(D_DURING, dev,
552 "create header from %d to %d; protocol %d (%Xh); size %u.\n",
553 saddr ? *(uint8_t *)saddr : -1,
554 daddr ? *(uint8_t *)daddr : -1,
555 type, type, len);
556
557 if (skb->len != 0 && len != skb->len)
558 arc_printk(D_NORMAL, dev, "arcnet_header: Yikes! skb->len(%d) != len(%d)!\n",
559 skb->len, len);
560
561 /* Type is host order - ? */
562 if (type == ETH_P_ARCNET) {
563 proto = arc_raw_proto;
564 arc_printk(D_DEBUG, dev, "arc_raw_proto used. proto='%c'\n",
565 proto->suffix);
566 _daddr = daddr ? *(uint8_t *)daddr : 0;
567 } else if (!daddr) {
568 /* if the dest addr isn't provided, we can't choose an
569 * encapsulation! Store the packet type (eg. ETH_P_IP)
570 * for now, and we'll push on a real header when we do
571 * rebuild_header.
572 */
573 *(uint16_t *)skb_push(skb, 2) = type;
574 /* XXX: Why not use skb->mac_len? */
575 if (skb->network_header - skb->mac_header != 2)
576 arc_printk(D_NORMAL, dev, "arcnet_header: Yikes! diff (%u) is not 2!\n",
577 skb->network_header - skb->mac_header);
578 return -2; /* return error -- can't transmit yet! */
579 } else {
580 /* otherwise, we can just add the header as usual. */
581 _daddr = *(uint8_t *)daddr;
582 proto_num = lp->default_proto[_daddr];
583 proto = arc_proto_map[proto_num];
584 arc_printk(D_DURING, dev, "building header for %02Xh using protocol '%c'\n",
585 proto_num, proto->suffix);
586 if (proto == &arc_proto_null && arc_bcast_proto != proto) {
587 arc_printk(D_DURING, dev, "actually, let's use '%c' instead.\n",
588 arc_bcast_proto->suffix);
589 proto = arc_bcast_proto;
590 }
591 }
592 return proto->build_header(skb, dev, type, _daddr);
593}
594
595/* Called by the kernel in order to transmit a packet. */
596netdev_tx_t arcnet_send_packet(struct sk_buff *skb,
597 struct net_device *dev)
598{
599 struct arcnet_local *lp = netdev_priv(dev);
600 struct archdr *pkt;
601 struct arc_rfc1201 *soft;
602 struct ArcProto *proto;
603 int txbuf;
604 unsigned long flags;
605 int retval;
606
607 arc_printk(D_DURING, dev,
608 "transmit requested (status=%Xh, txbufs=%d/%d, len=%d, protocol %x)\n",
609 lp->hw.status(dev), lp->cur_tx, lp->next_tx, skb->len, skb->protocol);
610
611 pkt = (struct archdr *)skb->data;
612 soft = &pkt->soft.rfc1201;
613 proto = arc_proto_map[soft->proto];
614
615 arc_printk(D_SKB_SIZE, dev, "skb: transmitting %d bytes to %02X\n",
616 skb->len, pkt->hard.dest);
617 if (BUGLVL(D_SKB))
618 arcnet_dump_skb(dev, skb, "tx");
619
620 /* fits in one packet? */
621 if (skb->len - ARC_HDR_SIZE > XMTU && !proto->continue_tx) {
622 arc_printk(D_NORMAL, dev, "fixme: packet too large: compensating badly!\n");
623 dev_kfree_skb(skb);
624 return NETDEV_TX_OK; /* don't try again */
625 }
626
627 /* We're busy transmitting a packet... */
628 netif_stop_queue(dev);
629
630 spin_lock_irqsave(&lp->lock, flags);
631 lp->hw.intmask(dev, 0);
632 if (lp->next_tx == -1)
633 txbuf = get_arcbuf(dev);
634 else
635 txbuf = -1;
636
637 if (txbuf != -1) {
638 if (proto->prepare_tx(dev, pkt, skb->len, txbuf) &&
639 !proto->ack_tx) {
640 /* done right away and we don't want to acknowledge
641 * the package later - forget about it now
642 */
643 dev->stats.tx_bytes += skb->len;
644 dev_kfree_skb(skb);
645 } else {
646 /* do it the 'split' way */
647 lp->outgoing.proto = proto;
648 lp->outgoing.skb = skb;
649 lp->outgoing.pkt = pkt;
650
651 if (proto->continue_tx &&
652 proto->continue_tx(dev, txbuf)) {
653 arc_printk(D_NORMAL, dev,
654 "bug! continue_tx finished the first time! (proto='%c')\n",
655 proto->suffix);
656 }
657 }
658 retval = NETDEV_TX_OK;
659 lp->next_tx = txbuf;
660 } else {
661 retval = NETDEV_TX_BUSY;
662 }
663
664 arc_printk(D_DEBUG, dev, "%s: %d: %s, status: %x\n",
665 __FILE__, __LINE__, __func__, lp->hw.status(dev));
666 /* make sure we didn't ignore a TX IRQ while we were in here */
667 lp->hw.intmask(dev, 0);
668
669 arc_printk(D_DEBUG, dev, "%s: %d: %s\n", __FILE__, __LINE__, __func__);
670 lp->intmask |= TXFREEflag | EXCNAKflag;
671 lp->hw.intmask(dev, lp->intmask);
672 arc_printk(D_DEBUG, dev, "%s: %d: %s, status: %x\n",
673 __FILE__, __LINE__, __func__, lp->hw.status(dev));
674
675 arcnet_led_event(dev, ARCNET_LED_EVENT_TX);
676
677 spin_unlock_irqrestore(&lp->lock, flags);
678 return retval; /* no need to try again */
679}
680EXPORT_SYMBOL(arcnet_send_packet);
681
682/* Actually start transmitting a packet that was loaded into a buffer
683 * by prepare_tx. This should _only_ be called by the interrupt handler.
684 */
685static int go_tx(struct net_device *dev)
686{
687 struct arcnet_local *lp = netdev_priv(dev);
688
689 arc_printk(D_DURING, dev, "go_tx: status=%Xh, intmask=%Xh, next_tx=%d, cur_tx=%d\n",
690 lp->hw.status(dev), lp->intmask, lp->next_tx, lp->cur_tx);
691
692 if (lp->cur_tx != -1 || lp->next_tx == -1)
693 return 0;
694
695 if (BUGLVL(D_TX))
696 arcnet_dump_packet(dev, lp->next_tx, "go_tx", 0);
697
698 lp->cur_tx = lp->next_tx;
699 lp->next_tx = -1;
700
701 /* start sending */
702 lp->hw.command(dev, TXcmd | (lp->cur_tx << 3));
703
704 dev->stats.tx_packets++;
705 lp->lasttrans_dest = lp->lastload_dest;
706 lp->lastload_dest = 0;
707 lp->excnak_pending = 0;
708 lp->intmask |= TXFREEflag | EXCNAKflag;
709
710 return 1;
711}
712
713/* Called by the kernel when transmit times out */
714void arcnet_timeout(struct net_device *dev)
715{
716 unsigned long flags;
717 struct arcnet_local *lp = netdev_priv(dev);
718 int status = lp->hw.status(dev);
719 char *msg;
720
721 spin_lock_irqsave(&lp->lock, flags);
722 if (status & TXFREEflag) { /* transmit _DID_ finish */
723 msg = " - missed IRQ?";
724 } else {
725 msg = "";
726 dev->stats.tx_aborted_errors++;
727 lp->timed_out = 1;
728 lp->hw.command(dev, NOTXcmd | (lp->cur_tx << 3));
729 }
730 dev->stats.tx_errors++;
731
732 /* make sure we didn't miss a TX or a EXC NAK IRQ */
733 lp->hw.intmask(dev, 0);
734 lp->intmask |= TXFREEflag | EXCNAKflag;
735 lp->hw.intmask(dev, lp->intmask);
736
737 spin_unlock_irqrestore(&lp->lock, flags);
738
739 if (time_after(jiffies, lp->last_timeout + 10 * HZ)) {
740 arc_printk(D_EXTRA, dev, "tx timed out%s (status=%Xh, intmask=%Xh, dest=%02Xh)\n",
741 msg, status, lp->intmask, lp->lasttrans_dest);
742 lp->last_timeout = jiffies;
743 }
744
745 if (lp->cur_tx == -1)
746 netif_wake_queue(dev);
747}
748EXPORT_SYMBOL(arcnet_timeout);
749
750/* The typical workload of the driver: Handle the network interface
751 * interrupts. Establish which device needs attention, and call the correct
752 * chipset interrupt handler.
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 arc_printk(D_DURING, dev, "\n");
762
763 arc_printk(D_DURING, dev, "in arcnet_interrupt\n");
764
765 lp = netdev_priv(dev);
766 BUG_ON(!lp);
767
768 spin_lock(&lp->lock);
769
770 /* RESET flag was enabled - if device is not running, we must
771 * clear it right away (but nothing else).
772 */
773 if (!netif_running(dev)) {
774 if (lp->hw.status(dev) & RESETflag)
775 lp->hw.command(dev, CFLAGScmd | RESETclear);
776 lp->hw.intmask(dev, 0);
777 spin_unlock(&lp->lock);
778 return retval;
779 }
780
781 arc_printk(D_DURING, dev, "in arcnet_inthandler (status=%Xh, intmask=%Xh)\n",
782 lp->hw.status(dev), lp->intmask);
783
784 boguscount = 5;
785 do {
786 status = lp->hw.status(dev);
787 diagstatus = (status >> 8) & 0xFF;
788
789 arc_printk(D_DEBUG, dev, "%s: %d: %s: status=%x\n",
790 __FILE__, __LINE__, __func__, status);
791 didsomething = 0;
792
793 /* RESET flag was enabled - card is resetting and if RX is
794 * disabled, it's NOT because we just got a packet.
795 *
796 * The card is in an undefined state.
797 * Clear it out and start over.
798 */
799 if (status & RESETflag) {
800 arc_printk(D_NORMAL, dev, "spurious reset (status=%Xh)\n",
801 status);
802 arcnet_close(dev);
803 arcnet_open(dev);
804
805 /* get out of the interrupt handler! */
806 break;
807 }
808 /* RX is inhibited - we must have received something.
809 * Prepare to receive into the next buffer.
810 *
811 * We don't actually copy the received packet from the card
812 * until after the transmit handler runs (and possibly
813 * launches the next tx); this should improve latency slightly
814 * if we get both types of interrupts at once.
815 */
816 recbuf = -1;
817 if (status & lp->intmask & NORXflag) {
818 recbuf = lp->cur_rx;
819 arc_printk(D_DURING, dev, "Buffer #%d: receive irq (status=%Xh)\n",
820 recbuf, status);
821
822 lp->cur_rx = get_arcbuf(dev);
823 if (lp->cur_rx != -1) {
824 arc_printk(D_DURING, dev, "enabling receive to buffer #%d\n",
825 lp->cur_rx);
826 lp->hw.command(dev, RXcmd | (lp->cur_rx << 3) | RXbcasts);
827 }
828 didsomething++;
829 }
830
831 if ((diagstatus & EXCNAKflag)) {
832 arc_printk(D_DURING, dev, "EXCNAK IRQ (diagstat=%Xh)\n",
833 diagstatus);
834
835 lp->hw.command(dev, NOTXcmd); /* disable transmit */
836 lp->excnak_pending = 1;
837
838 lp->hw.command(dev, EXCNAKclear);
839 lp->intmask &= ~(EXCNAKflag);
840 didsomething++;
841 }
842
843 /* a transmit finished, and we're interested in it. */
844 if ((status & lp->intmask & TXFREEflag) || lp->timed_out) {
845 lp->intmask &= ~(TXFREEflag | EXCNAKflag);
846
847 arc_printk(D_DURING, dev, "TX IRQ (stat=%Xh)\n",
848 status);
849
850 if (lp->cur_tx != -1 && !lp->timed_out) {
851 if (!(status & TXACKflag)) {
852 if (lp->lasttrans_dest != 0) {
853 arc_printk(D_EXTRA, dev,
854 "transmit was not acknowledged! (status=%Xh, dest=%02Xh)\n",
855 status,
856 lp->lasttrans_dest);
857 dev->stats.tx_errors++;
858 dev->stats.tx_carrier_errors++;
859 } else {
860 arc_printk(D_DURING, dev,
861 "broadcast was not acknowledged; that's normal (status=%Xh, dest=%02Xh)\n",
862 status,
863 lp->lasttrans_dest);
864 }
865 }
866
867 if (lp->outgoing.proto &&
868 lp->outgoing.proto->ack_tx) {
869 int ackstatus;
870
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 /* send another packet if there is one */
890 go_tx(dev);
891
892 /* continue a split packet, if any */
893 if (lp->outgoing.proto &&
894 lp->outgoing.proto->continue_tx) {
895 int txbuf = get_arcbuf(dev);
896
897 if (txbuf != -1) {
898 if (lp->outgoing.proto->continue_tx(dev, txbuf)) {
899 /* that was the last segment */
900 dev->stats.tx_bytes += lp->outgoing.skb->len;
901 if (!lp->outgoing.proto->ack_tx) {
902 dev_kfree_skb_irq(lp->outgoing.skb);
903 lp->outgoing.proto = NULL;
904 }
905 }
906 lp->next_tx = txbuf;
907 }
908 }
909 /* inform upper layers of idleness, if necessary */
910 if (lp->cur_tx == -1)
911 netif_wake_queue(dev);
912 }
913 /* now process the received packet, if any */
914 if (recbuf != -1) {
915 if (BUGLVL(D_RX))
916 arcnet_dump_packet(dev, recbuf, "rx irq", 0);
917
918 arcnet_rx(dev, recbuf);
919 release_arcbuf(dev, recbuf);
920
921 didsomething++;
922 }
923 if (status & lp->intmask & RECONflag) {
924 lp->hw.command(dev, CFLAGScmd | CONFIGclear);
925 dev->stats.tx_carrier_errors++;
926
927 arc_printk(D_RECON, dev, "Network reconfiguration detected (status=%Xh)\n",
928 status);
929 if (netif_carrier_ok(dev)) {
930 netif_carrier_off(dev);
931 netdev_info(dev, "link down\n");
932 }
933 mod_timer(&lp->timer, jiffies + msecs_to_jiffies(1000));
934
935 arcnet_led_event(dev, ARCNET_LED_EVENT_RECON);
936 /* MYRECON bit is at bit 7 of diagstatus */
937 if (diagstatus & 0x80)
938 arc_printk(D_RECON, dev, "Put out that recon myself\n");
939
940 /* is the RECON info empty or old? */
941 if (!lp->first_recon || !lp->last_recon ||
942 time_after(jiffies, lp->last_recon + HZ * 10)) {
943 if (lp->network_down)
944 arc_printk(D_NORMAL, dev, "reconfiguration detected: cabling restored?\n");
945 lp->first_recon = lp->last_recon = jiffies;
946 lp->num_recons = lp->network_down = 0;
947
948 arc_printk(D_DURING, dev, "recon: clearing counters.\n");
949 } else { /* add to current RECON counter */
950 lp->last_recon = jiffies;
951 lp->num_recons++;
952
953 arc_printk(D_DURING, dev, "recon: counter=%d, time=%lds, net=%d\n",
954 lp->num_recons,
955 (lp->last_recon - lp->first_recon) / HZ,
956 lp->network_down);
957
958 /* if network is marked up;
959 * and first_recon and last_recon are 60+ apart;
960 * and the average no. of recons counted is
961 * > RECON_THRESHOLD/min;
962 * then print a warning message.
963 */
964 if (!lp->network_down &&
965 (lp->last_recon - lp->first_recon) <= HZ * 60 &&
966 lp->num_recons >= RECON_THRESHOLD) {
967 lp->network_down = 1;
968 arc_printk(D_NORMAL, dev, "many reconfigurations detected: cabling problem?\n");
969 } else if (!lp->network_down &&
970 lp->last_recon - lp->first_recon > HZ * 60) {
971 /* reset counters if we've gone for
972 * over a minute.
973 */
974 lp->first_recon = lp->last_recon;
975 lp->num_recons = 1;
976 }
977 }
978 } else if (lp->network_down &&
979 time_after(jiffies, lp->last_recon + HZ * 10)) {
980 if (lp->network_down)
981 arc_printk(D_NORMAL, dev, "cabling restored?\n");
982 lp->first_recon = lp->last_recon = 0;
983 lp->num_recons = lp->network_down = 0;
984
985 arc_printk(D_DURING, dev, "not recon: clearing counters anyway.\n");
986 netif_carrier_on(dev);
987 }
988
989 if (didsomething)
990 retval |= IRQ_HANDLED;
991 } while (--boguscount && didsomething);
992
993 arc_printk(D_DURING, dev, "arcnet_interrupt complete (status=%Xh, count=%d)\n",
994 lp->hw.status(dev), boguscount);
995 arc_printk(D_DURING, dev, "\n");
996
997 lp->hw.intmask(dev, 0);
998 udelay(1);
999 lp->hw.intmask(dev, lp->intmask);
1000
1001 spin_unlock(&lp->lock);
1002 return retval;
1003}
1004EXPORT_SYMBOL(arcnet_interrupt);
1005
1006/* This is a generic packet receiver that calls arcnet??_rx depending on the
1007 * protocol ID found.
1008 */
1009static void arcnet_rx(struct net_device *dev, int bufnum)
1010{
1011 struct arcnet_local *lp = netdev_priv(dev);
1012 struct archdr pkt;
1013 struct arc_rfc1201 *soft;
1014 int length, ofs;
1015
1016 soft = &pkt.soft.rfc1201;
1017
1018 lp->hw.copy_from_card(dev, bufnum, 0, &pkt, ARC_HDR_SIZE);
1019 if (pkt.hard.offset[0]) {
1020 ofs = pkt.hard.offset[0];
1021 length = 256 - ofs;
1022 } else {
1023 ofs = pkt.hard.offset[1];
1024 length = 512 - ofs;
1025 }
1026
1027 /* get the full header, if possible */
1028 if (sizeof(pkt.soft) <= length) {
1029 lp->hw.copy_from_card(dev, bufnum, ofs, soft, sizeof(pkt.soft));
1030 } else {
1031 memset(&pkt.soft, 0, sizeof(pkt.soft));
1032 lp->hw.copy_from_card(dev, bufnum, ofs, soft, length);
1033 }
1034
1035 arc_printk(D_DURING, dev, "Buffer #%d: received packet from %02Xh to %02Xh (%d+4 bytes)\n",
1036 bufnum, pkt.hard.source, pkt.hard.dest, length);
1037
1038 dev->stats.rx_packets++;
1039 dev->stats.rx_bytes += length + ARC_HDR_SIZE;
1040
1041 /* call the right receiver for the protocol */
1042 if (arc_proto_map[soft->proto]->is_ip) {
1043 if (BUGLVL(D_PROTO)) {
1044 struct ArcProto
1045 *oldp = arc_proto_map[lp->default_proto[pkt.hard.source]],
1046 *newp = arc_proto_map[soft->proto];
1047
1048 if (oldp != newp) {
1049 arc_printk(D_PROTO, dev,
1050 "got protocol %02Xh; encap for host %02Xh is now '%c' (was '%c')\n",
1051 soft->proto, pkt.hard.source,
1052 newp->suffix, oldp->suffix);
1053 }
1054 }
1055
1056 /* broadcasts will always be done with the last-used encap. */
1057 lp->default_proto[0] = soft->proto;
1058
1059 /* in striking contrast, the following isn't a hack. */
1060 lp->default_proto[pkt.hard.source] = soft->proto;
1061 }
1062 /* call the protocol-specific receiver. */
1063 arc_proto_map[soft->proto]->rx(dev, bufnum, &pkt, length);
1064}
1065
1066static void null_rx(struct net_device *dev, int bufnum,
1067 struct archdr *pkthdr, int length)
1068{
1069 arc_printk(D_PROTO, dev,
1070 "rx: don't know how to deal with proto %02Xh from host %02Xh.\n",
1071 pkthdr->soft.rfc1201.proto, pkthdr->hard.source);
1072}
1073
1074static int null_build_header(struct sk_buff *skb, struct net_device *dev,
1075 unsigned short type, uint8_t daddr)
1076{
1077 struct arcnet_local *lp = netdev_priv(dev);
1078
1079 arc_printk(D_PROTO, dev,
1080 "tx: can't build header for encap %02Xh; load a protocol driver.\n",
1081 lp->default_proto[daddr]);
1082
1083 /* always fails */
1084 return 0;
1085}
1086
1087/* the "do nothing" prepare_tx function warns that there's nothing to do. */
1088static int null_prepare_tx(struct net_device *dev, struct archdr *pkt,
1089 int length, int bufnum)
1090{
1091 struct arcnet_local *lp = netdev_priv(dev);
1092 struct arc_hardware newpkt;
1093
1094 arc_printk(D_PROTO, dev, "tx: no encap for this host; load a protocol driver.\n");
1095
1096 /* send a packet to myself -- will never get received, of course */
1097 newpkt.source = newpkt.dest = dev->dev_addr[0];
1098
1099 /* only one byte of actual data (and it's random) */
1100 newpkt.offset[0] = 0xFF;
1101
1102 lp->hw.copy_to_card(dev, bufnum, 0, &newpkt, ARC_HDR_SIZE);
1103
1104 return 1; /* done */
1105}