blob: c59c8067de991989498bceb5b9f0dbc9a60c2e03 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
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
Jeff Morrow52edc172007-02-16 01:42:27 -080044#define VERSION "arcnet: v3.94 BETA 2007/02/08 - by Avery Pennarun et al.\n"
Linus Torvalds1da177e2005-04-16 15:20:36 -070045
46#include <linux/module.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070047#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>
Marcelo Feitoza Parisiff5688a2006-01-09 18:37:15 -080054#include <linux/jiffies.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070055
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
Adrian Bunkf03aa2d2006-01-14 03:10:22 +010064static void arcnet_rx(struct net_device *dev, int bufnum);
Linus Torvalds1da177e2005-04-16 15:20:36 -070065
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
Adrian Bunkf03aa2d2006-01-14 03:10:22 +010075static struct ArcProto arc_proto_null =
Linus Torvalds1da177e2005-04-16 15:20:36 -070076{
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);
Linus Torvalds1da177e2005-04-16 15:20:36 -070094EXPORT_SYMBOL(arcnet_unregister_proto);
95EXPORT_SYMBOL(arcnet_debug);
96EXPORT_SYMBOL(alloc_arcdev);
97EXPORT_SYMBOL(arcnet_interrupt);
98
99/* Internal function prototypes */
100static int arcnet_open(struct net_device *dev);
101static int arcnet_close(struct net_device *dev);
102static int arcnet_send_packet(struct sk_buff *skb, struct net_device *dev);
103static void arcnet_timeout(struct net_device *dev);
104static int arcnet_header(struct sk_buff *skb, struct net_device *dev,
Stephen Hemminger3b04ddd2007-10-09 01:40:57 -0700105 unsigned short type, const void *daddr,
106 const void *saddr, unsigned len);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700107static int arcnet_rebuild_header(struct sk_buff *skb);
108static struct net_device_stats *arcnet_get_stats(struct net_device *dev);
109static int go_tx(struct net_device *dev);
110
111static int debug = ARCNET_DEBUG;
112module_param(debug, int, 0);
113MODULE_LICENSE("GPL");
114
115static int __init arcnet_init(void)
116{
117 int count;
118
119 arcnet_debug = debug;
120
Adrian Bunkf03aa2d2006-01-14 03:10:22 +0100121 printk("arcnet loaded.\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700122
123#ifdef ALPHA_WARNING
124 BUGLVL(D_EXTRA) {
125 printk("arcnet: ***\n"
126 "arcnet: * Read arcnet.txt for important release notes!\n"
127 "arcnet: *\n"
128 "arcnet: * This is an ALPHA version! (Last stable release: v3.02) E-mail\n"
129 "arcnet: * me if you have any questions, comments, or bug reports.\n"
130 "arcnet: ***\n");
131 }
132#endif
133
134 /* initialize the protocol map */
135 arc_raw_proto = arc_proto_default = arc_bcast_proto = &arc_proto_null;
136 for (count = 0; count < 256; count++)
137 arc_proto_map[count] = arc_proto_default;
138
139 BUGLVL(D_DURING)
140 printk("arcnet: struct sizes: %Zd %Zd %Zd %Zd %Zd\n",
141 sizeof(struct arc_hardware), sizeof(struct arc_rfc1201),
142 sizeof(struct arc_rfc1051), sizeof(struct arc_eth_encap),
143 sizeof(struct archdr));
144
145 return 0;
146}
147
148static void __exit arcnet_exit(void)
149{
150}
151
152module_init(arcnet_init);
153module_exit(arcnet_exit);
154
155/*
156 * Dump the contents of an sk_buff
157 */
158#if ARCNET_DEBUG_MAX & D_SKB
159void arcnet_dump_skb(struct net_device *dev,
160 struct sk_buff *skb, char *desc)
161{
162 int i;
163
164 printk(KERN_DEBUG "%6s: skb dump (%s) follows:", dev->name, desc);
165 for (i = 0; i < skb->len; i++) {
166 if (i % 16 == 0)
167 printk("\n" KERN_DEBUG "[%04X] ", i);
168 printk("%02X ", ((u_char *) skb->data)[i]);
169 }
170 printk("\n");
171}
172
173EXPORT_SYMBOL(arcnet_dump_skb);
174#endif
175
176
177/*
178 * Dump the contents of an ARCnet buffer
179 */
180#if (ARCNET_DEBUG_MAX & (D_RX | D_TX))
Adrian Bunkf03aa2d2006-01-14 03:10:22 +0100181static void arcnet_dump_packet(struct net_device *dev, int bufnum,
182 char *desc, int take_arcnet_lock)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700183{
184 struct arcnet_local *lp = dev->priv;
185 int i, length;
186 unsigned long flags = 0;
187 static uint8_t buf[512];
188
189 /* hw.copy_from_card expects IRQ context so take the IRQ lock
190 to keep it single threaded */
191 if(take_arcnet_lock)
192 spin_lock_irqsave(&lp->lock, flags);
193
194 lp->hw.copy_from_card(dev, bufnum, 0, buf, 512);
195 if(take_arcnet_lock)
196 spin_unlock_irqrestore(&lp->lock, flags);
197
198 /* if the offset[0] byte is nonzero, this is a 256-byte packet */
199 length = (buf[2] ? 256 : 512);
200
201 printk(KERN_DEBUG "%6s: packet dump (%s) follows:", dev->name, desc);
202 for (i = 0; i < length; i++) {
203 if (i % 16 == 0)
204 printk("\n" KERN_DEBUG "[%04X] ", i);
205 printk("%02X ", buf[i]);
206 }
207 printk("\n");
208
209}
210
Adrian Bunkf03aa2d2006-01-14 03:10:22 +0100211#else
212
213#define arcnet_dump_packet(dev, bufnum, desc,take_arcnet_lock) do { } while (0)
214
Linus Torvalds1da177e2005-04-16 15:20:36 -0700215#endif
216
217
218/*
219 * Unregister a protocol driver from the arc_proto_map. Protocol drivers
220 * are responsible for registering themselves, but the unregister routine
221 * is pretty generic so we'll do it here.
222 */
223void arcnet_unregister_proto(struct ArcProto *proto)
224{
225 int count;
226
227 if (arc_proto_default == proto)
228 arc_proto_default = &arc_proto_null;
229 if (arc_bcast_proto == proto)
230 arc_bcast_proto = arc_proto_default;
231 if (arc_raw_proto == proto)
232 arc_raw_proto = arc_proto_default;
233
234 for (count = 0; count < 256; count++) {
235 if (arc_proto_map[count] == proto)
236 arc_proto_map[count] = arc_proto_default;
237 }
238}
239
240
241/*
242 * Add a buffer to the queue. Only the interrupt handler is allowed to do
243 * this, unless interrupts are disabled.
244 *
245 * Note: we don't check for a full queue, since there aren't enough buffers
246 * to more than fill it.
247 */
248static void release_arcbuf(struct net_device *dev, int bufnum)
249{
250 struct arcnet_local *lp = dev->priv;
251 int i;
252
253 lp->buf_queue[lp->first_free_buf++] = bufnum;
254 lp->first_free_buf %= 5;
255
256 BUGLVL(D_DURING) {
257 BUGMSG(D_DURING, "release_arcbuf: freed #%d; buffer queue is now: ",
258 bufnum);
259 for (i = lp->next_buf; i != lp->first_free_buf; i = (i+1) % 5)
260 BUGMSG2(D_DURING, "#%d ", lp->buf_queue[i]);
261 BUGMSG2(D_DURING, "\n");
262 }
263}
264
265
266/*
267 * Get a buffer from the queue. If this returns -1, there are no buffers
268 * available.
269 */
270static int get_arcbuf(struct net_device *dev)
271{
272 struct arcnet_local *lp = dev->priv;
273 int buf = -1, i;
274
275 if (!atomic_dec_and_test(&lp->buf_lock)) {
276 /* already in this function */
277 BUGMSG(D_NORMAL, "get_arcbuf: overlap (%d)!\n",
278 lp->buf_lock.counter);
279 }
280 else { /* we can continue */
281 if (lp->next_buf >= 5)
282 lp->next_buf -= 5;
283
284 if (lp->next_buf == lp->first_free_buf)
285 BUGMSG(D_NORMAL, "get_arcbuf: BUG: no buffers are available??\n");
286 else {
287 buf = lp->buf_queue[lp->next_buf++];
288 lp->next_buf %= 5;
289 }
290 }
291
292
293 BUGLVL(D_DURING) {
294 BUGMSG(D_DURING, "get_arcbuf: got #%d; buffer queue is now: ", buf);
295 for (i = lp->next_buf; i != lp->first_free_buf; i = (i+1) % 5)
296 BUGMSG2(D_DURING, "#%d ", lp->buf_queue[i]);
297 BUGMSG2(D_DURING, "\n");
298 }
299
300 atomic_inc(&lp->buf_lock);
301 return buf;
302}
303
304
305static int choose_mtu(void)
306{
307 int count, mtu = 65535;
308
309 /* choose the smallest MTU of all available encaps */
310 for (count = 0; count < 256; count++) {
311 if (arc_proto_map[count] != &arc_proto_null
312 && arc_proto_map[count]->mtu < mtu) {
313 mtu = arc_proto_map[count]->mtu;
314 }
315 }
316
317 return mtu == 65535 ? XMTU : mtu;
318}
319
Stephen Hemminger3b04ddd2007-10-09 01:40:57 -0700320static const struct header_ops arcnet_header_ops = {
321 .create = arcnet_header,
322 .rebuild = arcnet_rebuild_header,
323};
324
Linus Torvalds1da177e2005-04-16 15:20:36 -0700325
326/* Setup a struct device for ARCnet. */
327static void arcdev_setup(struct net_device *dev)
328{
329 dev->type = ARPHRD_ARCNET;
Stephen Hemminger3b04ddd2007-10-09 01:40:57 -0700330 dev->header_ops = &arcnet_header_ops;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700331 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 * Put in this stuff here, so we don't have to export the symbols to
344 * the chipset drivers.
345 */
346 dev->open = arcnet_open;
347 dev->stop = arcnet_close;
348 dev->hard_start_xmit = arcnet_send_packet;
349 dev->tx_timeout = arcnet_timeout;
350 dev->get_stats = arcnet_get_stats;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700351}
352
353struct net_device *alloc_arcdev(char *name)
354{
355 struct net_device *dev;
356
357 dev = alloc_netdev(sizeof(struct arcnet_local),
358 name && *name ? name : "arc%d", arcdev_setup);
359 if(dev) {
360 struct arcnet_local *lp = (struct arcnet_local *) dev->priv;
361 spin_lock_init(&lp->lock);
362 }
363
364 return dev;
365}
366
367/*
368 * Open/initialize the board. This is called sometime after booting when
369 * the 'ifconfig' program is run.
370 *
371 * This routine should set everything up anew at each open, even registers
372 * that "should" only need to be set once at boot, so that there is
373 * non-reboot way to recover if something goes wrong.
374 */
375static int arcnet_open(struct net_device *dev)
376{
377 struct arcnet_local *lp = dev->priv;
378 int count, newmtu, error;
379
380 BUGMSG(D_INIT,"opened.");
381
382 if (!try_module_get(lp->hw.owner))
383 return -ENODEV;
384
385 BUGLVL(D_PROTO) {
386 int count;
387 BUGMSG(D_PROTO, "protocol map (default is '%c'): ",
388 arc_proto_default->suffix);
389 for (count = 0; count < 256; count++)
390 BUGMSG2(D_PROTO, "%c", arc_proto_map[count]->suffix);
391 BUGMSG2(D_PROTO, "\n");
392 }
393
394
395 BUGMSG(D_INIT, "arcnet_open: resetting card.\n");
396
397 /* try to put the card in a defined state - if it fails the first
398 * time, actually reset it.
399 */
400 error = -ENODEV;
401 if (ARCRESET(0) && ARCRESET(1))
402 goto out_module_put;
403
404 newmtu = choose_mtu();
405 if (newmtu < dev->mtu)
406 dev->mtu = newmtu;
407
408 BUGMSG(D_INIT, "arcnet_open: mtu: %d.\n", dev->mtu);
409
410 /* autodetect the encapsulation for each host. */
411 memset(lp->default_proto, 0, sizeof(lp->default_proto));
412
413 /* the broadcast address is special - use the 'bcast' protocol */
414 for (count = 0; count < 256; count++) {
415 if (arc_proto_map[count] == arc_bcast_proto) {
416 lp->default_proto[0] = count;
417 break;
418 }
419 }
420
421 /* initialize buffers */
422 atomic_set(&lp->buf_lock, 1);
423
424 lp->next_buf = lp->first_free_buf = 0;
425 release_arcbuf(dev, 0);
426 release_arcbuf(dev, 1);
427 release_arcbuf(dev, 2);
428 release_arcbuf(dev, 3);
429 lp->cur_tx = lp->next_tx = -1;
430 lp->cur_rx = -1;
431
432 lp->rfc1201.sequence = 1;
433
434 /* bring up the hardware driver */
435 if (lp->hw.open)
436 lp->hw.open(dev);
437
438 if (dev->dev_addr[0] == 0)
439 BUGMSG(D_NORMAL, "WARNING! Station address 00 is reserved "
440 "for broadcasts!\n");
441 else if (dev->dev_addr[0] == 255)
442 BUGMSG(D_NORMAL, "WARNING! Station address FF may confuse "
443 "DOS networking programs!\n");
444
445 BUGMSG(D_DEBUG, "%s: %d: %s\n",__FILE__,__LINE__,__FUNCTION__);
446 if (ASTATUS() & RESETflag) {
447 BUGMSG(D_DEBUG, "%s: %d: %s\n",__FILE__,__LINE__,__FUNCTION__);
448 ACOMMAND(CFLAGScmd | RESETclear);
449 }
450
451
452 BUGMSG(D_DEBUG, "%s: %d: %s\n",__FILE__,__LINE__,__FUNCTION__);
453 /* make sure we're ready to receive IRQ's. */
454 AINTMASK(0);
455 udelay(1); /* give it time to set the mask before
456 * we reset it again. (may not even be
457 * necessary)
458 */
459 BUGMSG(D_DEBUG, "%s: %d: %s\n",__FILE__,__LINE__,__FUNCTION__);
460 lp->intmask = NORXflag | RECONflag;
461 AINTMASK(lp->intmask);
462 BUGMSG(D_DEBUG, "%s: %d: %s\n",__FILE__,__LINE__,__FUNCTION__);
463
464 netif_start_queue(dev);
465
466 return 0;
467
468 out_module_put:
469 module_put(lp->hw.owner);
470 return error;
471}
472
473
474/* The inverse routine to arcnet_open - shuts down the card. */
475static int arcnet_close(struct net_device *dev)
476{
477 struct arcnet_local *lp = dev->priv;
478
479 netif_stop_queue(dev);
480
481 /* flush TX and disable RX */
482 AINTMASK(0);
483 ACOMMAND(NOTXcmd); /* stop transmit */
484 ACOMMAND(NORXcmd); /* disable receive */
485 mdelay(1);
486
487 /* shut down the card */
488 lp->hw.close(dev);
489 module_put(lp->hw.owner);
490 return 0;
491}
492
493
494static int arcnet_header(struct sk_buff *skb, struct net_device *dev,
Stephen Hemminger3b04ddd2007-10-09 01:40:57 -0700495 unsigned short type, const void *daddr,
496 const void *saddr, unsigned len)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700497{
Stephen Hemminger3b04ddd2007-10-09 01:40:57 -0700498 const struct arcnet_local *lp = netdev_priv(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700499 uint8_t _daddr, proto_num;
500 struct ArcProto *proto;
501
502 BUGMSG(D_DURING,
503 "create header from %d to %d; protocol %d (%Xh); size %u.\n",
504 saddr ? *(uint8_t *) saddr : -1,
505 daddr ? *(uint8_t *) daddr : -1,
506 type, type, len);
507
508 if (skb->len!=0 && len != skb->len)
509 BUGMSG(D_NORMAL, "arcnet_header: Yikes! skb->len(%d) != len(%d)!\n",
510 skb->len, len);
511
512
513 /* Type is host order - ? */
514 if(type == ETH_P_ARCNET) {
515 proto = arc_raw_proto;
516 BUGMSG(D_DEBUG, "arc_raw_proto used. proto='%c'\n",proto->suffix);
517 _daddr = daddr ? *(uint8_t *) daddr : 0;
518 }
519 else if (!daddr) {
520 /*
521 * if the dest addr isn't provided, we can't choose an encapsulation!
522 * Store the packet type (eg. ETH_P_IP) for now, and we'll push on a
523 * real header when we do rebuild_header.
524 */
525 *(uint16_t *) skb_push(skb, 2) = type;
Arnaldo Carvalho de Melob0e380b2007-04-10 21:21:55 -0700526 /*
527 * XXX: Why not use skb->mac_len?
528 */
529 if (skb->network_header - skb->mac_header != 2)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700530 BUGMSG(D_NORMAL, "arcnet_header: Yikes! diff (%d) is not 2!\n",
Arnaldo Carvalho de Melob0e380b2007-04-10 21:21:55 -0700531 (int)(skb->network_header - skb->mac_header));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700532 return -2; /* return error -- can't transmit yet! */
533 }
534 else {
535 /* otherwise, we can just add the header as usual. */
536 _daddr = *(uint8_t *) daddr;
537 proto_num = lp->default_proto[_daddr];
538 proto = arc_proto_map[proto_num];
539 BUGMSG(D_DURING, "building header for %02Xh using protocol '%c'\n",
540 proto_num, proto->suffix);
541 if (proto == &arc_proto_null && arc_bcast_proto != proto) {
542 BUGMSG(D_DURING, "actually, let's use '%c' instead.\n",
543 arc_bcast_proto->suffix);
544 proto = arc_bcast_proto;
545 }
546 }
547 return proto->build_header(skb, dev, type, _daddr);
548}
549
550
551/*
552 * Rebuild the ARCnet hard header. This is called after an ARP (or in the
553 * future other address resolution) has completed on this sk_buff. We now
554 * let ARP fill in the destination field.
555 */
556static int arcnet_rebuild_header(struct sk_buff *skb)
557{
558 struct net_device *dev = skb->dev;
559 struct arcnet_local *lp = dev->priv;
560 int status = 0; /* default is failure */
561 unsigned short type;
562 uint8_t daddr=0;
563 struct ArcProto *proto;
Arnaldo Carvalho de Melob0e380b2007-04-10 21:21:55 -0700564 /*
565 * XXX: Why not use skb->mac_len?
566 */
567 if (skb->network_header - skb->mac_header != 2) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700568 BUGMSG(D_NORMAL,
Arnaldo Carvalho de Melob0e380b2007-04-10 21:21:55 -0700569 "rebuild_header: shouldn't be here! (hdrsize=%d)\n",
570 (int)(skb->network_header - skb->mac_header));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700571 return 0;
572 }
573 type = *(uint16_t *) skb_pull(skb, 2);
574 BUGMSG(D_DURING, "rebuild header for protocol %Xh\n", type);
575
576 if (type == ETH_P_IP) {
577#ifdef CONFIG_INET
578 BUGMSG(D_DURING, "rebuild header for ethernet protocol %Xh\n", type);
579 status = arp_find(&daddr, skb) ? 1 : 0;
580 BUGMSG(D_DURING, " rebuilt: dest is %d; protocol %Xh\n",
581 daddr, type);
582#endif
583 } else {
584 BUGMSG(D_NORMAL,
585 "I don't understand ethernet protocol %Xh addresses!\n", type);
586 lp->stats.tx_errors++;
587 lp->stats.tx_aborted_errors++;
588 }
589
590 /* if we couldn't resolve the address... give up. */
591 if (!status)
592 return 0;
593
594 /* add the _real_ header this time! */
595 proto = arc_proto_map[lp->default_proto[daddr]];
596 proto->build_header(skb, dev, type, daddr);
597
598 return 1; /* success */
599}
600
601
602
603/* Called by the kernel in order to transmit a packet. */
604static int arcnet_send_packet(struct sk_buff *skb, struct net_device *dev)
605{
606 struct arcnet_local *lp = dev->priv;
607 struct archdr *pkt;
608 struct arc_rfc1201 *soft;
609 struct ArcProto *proto;
610 int txbuf;
611 unsigned long flags;
Pieter Dejaegherec6bb15a2005-09-06 19:54:48 -0700612 int freeskb, retval;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700613
614 BUGMSG(D_DURING,
615 "transmit requested (status=%Xh, txbufs=%d/%d, len=%d, protocol %x)\n",
616 ASTATUS(), lp->cur_tx, lp->next_tx, skb->len,skb->protocol);
617
618 pkt = (struct archdr *) skb->data;
619 soft = &pkt->soft.rfc1201;
620 proto = arc_proto_map[soft->proto];
621
622 BUGMSG(D_SKB_SIZE, "skb: transmitting %d bytes to %02X\n",
623 skb->len, pkt->hard.dest);
624 BUGLVL(D_SKB) arcnet_dump_skb(dev, skb, "tx");
625
626 /* fits in one packet? */
627 if (skb->len - ARC_HDR_SIZE > XMTU && !proto->continue_tx) {
628 BUGMSG(D_NORMAL, "fixme: packet too large: compensating badly!\n");
629 dev_kfree_skb(skb);
Pieter Dejaegherec6bb15a2005-09-06 19:54:48 -0700630 return NETDEV_TX_OK; /* don't try again */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700631 }
632
633 /* We're busy transmitting a packet... */
634 netif_stop_queue(dev);
635
636 spin_lock_irqsave(&lp->lock, flags);
637 AINTMASK(0);
Pieter Dejaegherec6bb15a2005-09-06 19:54:48 -0700638 if(lp->next_tx == -1)
639 txbuf = get_arcbuf(dev);
640 else {
641 txbuf = -1;
642 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700643 if (txbuf != -1) {
644 if (proto->prepare_tx(dev, pkt, skb->len, txbuf) &&
645 !proto->ack_tx) {
646 /* done right away and we don't want to acknowledge
647 the package later - forget about it now */
648 lp->stats.tx_bytes += skb->len;
649 freeskb = 1;
650 } else {
651 /* do it the 'split' way */
652 lp->outgoing.proto = proto;
653 lp->outgoing.skb = skb;
654 lp->outgoing.pkt = pkt;
655
Pieter Dejaegherec6bb15a2005-09-06 19:54:48 -0700656 freeskb = 0;
657
Linus Torvalds1da177e2005-04-16 15:20:36 -0700658 if (proto->continue_tx &&
659 proto->continue_tx(dev, txbuf)) {
660 BUGMSG(D_NORMAL,
661 "bug! continue_tx finished the first time! "
662 "(proto='%c')\n", proto->suffix);
663 }
664 }
Pieter Dejaegherec6bb15a2005-09-06 19:54:48 -0700665 retval = NETDEV_TX_OK;
666 dev->trans_start = jiffies;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700667 lp->next_tx = txbuf;
668 } else {
Pieter Dejaegherec6bb15a2005-09-06 19:54:48 -0700669 retval = NETDEV_TX_BUSY;
670 freeskb = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700671 }
672
673 BUGMSG(D_DEBUG, "%s: %d: %s, status: %x\n",__FILE__,__LINE__,__FUNCTION__,ASTATUS());
674 /* make sure we didn't ignore a TX IRQ while we were in here */
675 AINTMASK(0);
676
677 BUGMSG(D_DEBUG, "%s: %d: %s\n",__FILE__,__LINE__,__FUNCTION__);
678 lp->intmask |= TXFREEflag|EXCNAKflag;
679 AINTMASK(lp->intmask);
680 BUGMSG(D_DEBUG, "%s: %d: %s, status: %x\n",__FILE__,__LINE__,__FUNCTION__,ASTATUS());
681
682 spin_unlock_irqrestore(&lp->lock, flags);
683 if (freeskb) {
684 dev_kfree_skb(skb);
685 }
Pieter Dejaegherec6bb15a2005-09-06 19:54:48 -0700686 return retval; /* no need to try again */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700687}
688
689
690/*
691 * Actually start transmitting a packet that was loaded into a buffer
692 * by prepare_tx. This should _only_ be called by the interrupt handler.
693 */
694static int go_tx(struct net_device *dev)
695{
696 struct arcnet_local *lp = dev->priv;
697
698 BUGMSG(D_DURING, "go_tx: status=%Xh, intmask=%Xh, next_tx=%d, cur_tx=%d\n",
699 ASTATUS(), lp->intmask, lp->next_tx, lp->cur_tx);
700
701 if (lp->cur_tx != -1 || lp->next_tx == -1)
702 return 0;
703
704 BUGLVL(D_TX) arcnet_dump_packet(dev, lp->next_tx, "go_tx", 0);
705
706 lp->cur_tx = lp->next_tx;
707 lp->next_tx = -1;
708
709 /* start sending */
710 ACOMMAND(TXcmd | (lp->cur_tx << 3));
711
Linus Torvalds1da177e2005-04-16 15:20:36 -0700712 lp->stats.tx_packets++;
713 lp->lasttrans_dest = lp->lastload_dest;
714 lp->lastload_dest = 0;
715 lp->excnak_pending = 0;
716 lp->intmask |= TXFREEflag|EXCNAKflag;
717
718 return 1;
719}
720
721
722/* Called by the kernel when transmit times out */
723static void arcnet_timeout(struct net_device *dev)
724{
725 unsigned long flags;
726 struct arcnet_local *lp = dev->priv;
727 int status = ASTATUS();
728 char *msg;
729
730 spin_lock_irqsave(&lp->lock, flags);
731 if (status & TXFREEflag) { /* transmit _DID_ finish */
732 msg = " - missed IRQ?";
733 } else {
734 msg = "";
735 lp->stats.tx_aborted_errors++;
736 lp->timed_out = 1;
737 ACOMMAND(NOTXcmd | (lp->cur_tx << 3));
738 }
739 lp->stats.tx_errors++;
740
741 /* make sure we didn't miss a TX or a EXC NAK IRQ */
742 AINTMASK(0);
743 lp->intmask |= TXFREEflag|EXCNAKflag;
744 AINTMASK(lp->intmask);
745
746 spin_unlock_irqrestore(&lp->lock, flags);
747
Marcelo Feitoza Parisiff5688a2006-01-09 18:37:15 -0800748 if (time_after(jiffies, lp->last_timeout + 10*HZ)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700749 BUGMSG(D_EXTRA, "tx timed out%s (status=%Xh, intmask=%Xh, dest=%02Xh)\n",
750 msg, status, lp->intmask, lp->lasttrans_dest);
751 lp->last_timeout = jiffies;
752 }
753
754 if (lp->cur_tx == -1)
755 netif_wake_queue(dev);
756}
757
758
759/*
760 * The typical workload of the driver: Handle the network interface
761 * interrupts. Establish which device needs attention, and call the correct
762 * chipset interrupt handler.
763 */
David Howells7d12e782006-10-05 14:55:46 +0100764irqreturn_t arcnet_interrupt(int irq, void *dev_id)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700765{
766 struct net_device *dev = dev_id;
767 struct arcnet_local *lp;
768 int recbuf, status, diagstatus, didsomething, boguscount;
769 int retval = IRQ_NONE;
770
771 BUGMSG(D_DURING, "\n");
772
773 BUGMSG(D_DURING, "in arcnet_interrupt\n");
774
775 lp = dev->priv;
Eric Sesterhenn5d9428d2006-04-02 13:52:48 +0200776 BUG_ON(!lp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700777
778 spin_lock(&lp->lock);
779
780 /*
781 * RESET flag was enabled - if device is not running, we must clear it right
782 * away (but nothing else).
783 */
784 if (!netif_running(dev)) {
785 if (ASTATUS() & RESETflag)
786 ACOMMAND(CFLAGScmd | RESETclear);
787 AINTMASK(0);
788 spin_unlock(&lp->lock);
789 return IRQ_HANDLED;
790 }
791
792 BUGMSG(D_DURING, "in arcnet_inthandler (status=%Xh, intmask=%Xh)\n",
793 ASTATUS(), lp->intmask);
794
795 boguscount = 5;
796 do {
797 status = ASTATUS();
798 diagstatus = (status >> 8) & 0xFF;
799
800 BUGMSG(D_DEBUG, "%s: %d: %s: status=%x\n",
801 __FILE__,__LINE__,__FUNCTION__,status);
802 didsomething = 0;
803
804 /*
805 * RESET flag was enabled - card is resetting and if RX is
806 * disabled, it's NOT because we just got a packet.
807 *
808 * The card is in an undefined state. Clear it out and start over.
809 */
810 if (status & RESETflag) {
811 BUGMSG(D_NORMAL, "spurious reset (status=%Xh)\n", status);
812 arcnet_close(dev);
813 arcnet_open(dev);
814
815 /* get out of the interrupt handler! */
816 break;
817 }
818 /*
819 * RX is inhibited - we must have received something. Prepare to
820 * receive into the next buffer.
821 *
822 * We don't actually copy the received packet from the card until
823 * after the transmit handler runs (and possibly launches the next
824 * tx); this should improve latency slightly if we get both types
825 * of interrupts at once.
826 */
827 recbuf = -1;
828 if (status & lp->intmask & NORXflag) {
829 recbuf = lp->cur_rx;
830 BUGMSG(D_DURING, "Buffer #%d: receive irq (status=%Xh)\n",
831 recbuf, status);
832
833 lp->cur_rx = get_arcbuf(dev);
834 if (lp->cur_rx != -1) {
835 BUGMSG(D_DURING, "enabling receive to buffer #%d\n",
836 lp->cur_rx);
837 ACOMMAND(RXcmd | (lp->cur_rx << 3) | RXbcasts);
838 }
839 didsomething++;
840 }
841
842 if((diagstatus & EXCNAKflag)) {
843 BUGMSG(D_DURING, "EXCNAK IRQ (diagstat=%Xh)\n",
844 diagstatus);
845
846 ACOMMAND(NOTXcmd); /* disable transmit */
847 lp->excnak_pending = 1;
848
849 ACOMMAND(EXCNAKclear);
850 lp->intmask &= ~(EXCNAKflag);
851 didsomething++;
852 }
853
854
855 /* a transmit finished, and we're interested in it. */
856 if ((status & lp->intmask & TXFREEflag) || lp->timed_out) {
857 lp->intmask &= ~(TXFREEflag|EXCNAKflag);
858
859 BUGMSG(D_DURING, "TX IRQ (stat=%Xh)\n", status);
860
861 if (lp->cur_tx != -1 && !lp->timed_out) {
862 if(!(status & TXACKflag)) {
863 if (lp->lasttrans_dest != 0) {
864 BUGMSG(D_EXTRA,
865 "transmit was not acknowledged! "
866 "(status=%Xh, dest=%02Xh)\n",
867 status, lp->lasttrans_dest);
868 lp->stats.tx_errors++;
869 lp->stats.tx_carrier_errors++;
870 } else {
871 BUGMSG(D_DURING,
872 "broadcast was not acknowledged; that's normal "
873 "(status=%Xh, dest=%02Xh)\n",
874 status, lp->lasttrans_dest);
875 }
876 }
877
878 if (lp->outgoing.proto &&
879 lp->outgoing.proto->ack_tx) {
880 int ackstatus;
881 if(status & TXACKflag)
882 ackstatus=2;
883 else if(lp->excnak_pending)
884 ackstatus=1;
885 else
886 ackstatus=0;
887
888 lp->outgoing.proto
889 ->ack_tx(dev, ackstatus);
890 }
891 }
892 if (lp->cur_tx != -1)
893 release_arcbuf(dev, lp->cur_tx);
894
895 lp->cur_tx = -1;
896 lp->timed_out = 0;
897 didsomething++;
898
899 /* send another packet if there is one */
900 go_tx(dev);
901
902 /* continue a split packet, if any */
903 if (lp->outgoing.proto && lp->outgoing.proto->continue_tx) {
904 int txbuf = get_arcbuf(dev);
905 if (txbuf != -1) {
906 if (lp->outgoing.proto->continue_tx(dev, txbuf)) {
907 /* that was the last segment */
908 lp->stats.tx_bytes += lp->outgoing.skb->len;
909 if(!lp->outgoing.proto->ack_tx)
910 {
911 dev_kfree_skb_irq(lp->outgoing.skb);
912 lp->outgoing.proto = NULL;
913 }
914 }
915 lp->next_tx = txbuf;
916 }
917 }
918 /* inform upper layers of idleness, if necessary */
919 if (lp->cur_tx == -1)
920 netif_wake_queue(dev);
921 }
922 /* now process the received packet, if any */
923 if (recbuf != -1) {
924 BUGLVL(D_RX) arcnet_dump_packet(dev, recbuf, "rx irq", 0);
925
926 arcnet_rx(dev, recbuf);
927 release_arcbuf(dev, recbuf);
928
929 didsomething++;
930 }
931 if (status & lp->intmask & RECONflag) {
932 ACOMMAND(CFLAGScmd | CONFIGclear);
933 lp->stats.tx_carrier_errors++;
934
935 BUGMSG(D_RECON, "Network reconfiguration detected (status=%Xh)\n",
936 status);
Pieter Dejaegherec6bb15a2005-09-06 19:54:48 -0700937 /* MYRECON bit is at bit 7 of diagstatus */
938 if(diagstatus & 0x80)
939 BUGMSG(D_RECON,"Put out that recon myself\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700940
941 /* is the RECON info empty or old? */
942 if (!lp->first_recon || !lp->last_recon ||
943 jiffies - lp->last_recon > HZ * 10) {
944 if (lp->network_down)
945 BUGMSG(D_NORMAL, "reconfiguration detected: cabling restored?\n");
946 lp->first_recon = lp->last_recon = jiffies;
947 lp->num_recons = lp->network_down = 0;
948
949 BUGMSG(D_DURING, "recon: clearing counters.\n");
950 } else { /* add to current RECON counter */
951 lp->last_recon = jiffies;
952 lp->num_recons++;
953
954 BUGMSG(D_DURING, "recon: counter=%d, time=%lds, net=%d\n",
955 lp->num_recons,
956 (lp->last_recon - lp->first_recon) / HZ,
957 lp->network_down);
958
959 /* if network is marked up;
960 * and first_recon and last_recon are 60+ apart;
961 * and the average no. of recons counted is
962 * > RECON_THRESHOLD/min;
963 * then print a warning message.
964 */
965 if (!lp->network_down
966 && (lp->last_recon - lp->first_recon) <= HZ * 60
967 && lp->num_recons >= RECON_THRESHOLD) {
968 lp->network_down = 1;
969 BUGMSG(D_NORMAL, "many reconfigurations detected: cabling problem?\n");
970 } else if (!lp->network_down
971 && lp->last_recon - lp->first_recon > HZ * 60) {
972 /* reset counters if we've gone for over a minute. */
973 lp->first_recon = lp->last_recon;
974 lp->num_recons = 1;
975 }
976 }
977 } else if (lp->network_down && jiffies - lp->last_recon > HZ * 10) {
978 if (lp->network_down)
979 BUGMSG(D_NORMAL, "cabling restored?\n");
980 lp->first_recon = lp->last_recon = 0;
981 lp->num_recons = lp->network_down = 0;
982
983 BUGMSG(D_DURING, "not recon: clearing counters anyway.\n");
984 }
985
986 if(didsomething) {
987 retval |= IRQ_HANDLED;
988 }
989 }
990 while (--boguscount && didsomething);
991
992 BUGMSG(D_DURING, "arcnet_interrupt complete (status=%Xh, count=%d)\n",
993 ASTATUS(), boguscount);
994 BUGMSG(D_DURING, "\n");
995
996
997 AINTMASK(0);
998 udelay(1);
999 AINTMASK(lp->intmask);
1000
1001 spin_unlock(&lp->lock);
1002 return retval;
1003}
1004
1005
1006/*
1007 * This is a generic packet receiver that calls arcnet??_rx depending on the
1008 * protocol ID found.
1009 */
Adrian Bunkf03aa2d2006-01-14 03:10:22 +01001010static void arcnet_rx(struct net_device *dev, int bufnum)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001011{
1012 struct arcnet_local *lp = dev->priv;
1013 struct archdr pkt;
1014 struct arc_rfc1201 *soft;
1015 int length, ofs;
1016
1017 soft = &pkt.soft.rfc1201;
1018
1019 lp->hw.copy_from_card(dev, bufnum, 0, &pkt, sizeof(ARC_HDR_SIZE));
1020 if (pkt.hard.offset[0]) {
1021 ofs = pkt.hard.offset[0];
1022 length = 256 - ofs;
1023 } else {
1024 ofs = pkt.hard.offset[1];
1025 length = 512 - ofs;
1026 }
1027
1028 /* get the full header, if possible */
1029 if (sizeof(pkt.soft) <= length)
1030 lp->hw.copy_from_card(dev, bufnum, ofs, soft, sizeof(pkt.soft));
1031 else {
1032 memset(&pkt.soft, 0, sizeof(pkt.soft));
1033 lp->hw.copy_from_card(dev, bufnum, ofs, soft, length);
1034 }
1035
1036 BUGMSG(D_DURING, "Buffer #%d: received packet from %02Xh to %02Xh "
1037 "(%d+4 bytes)\n",
1038 bufnum, pkt.hard.source, pkt.hard.dest, length);
1039
1040 lp->stats.rx_packets++;
1041 lp->stats.rx_bytes += length + ARC_HDR_SIZE;
1042
1043 /* call the right receiver for the protocol */
1044 if (arc_proto_map[soft->proto]->is_ip) {
1045 BUGLVL(D_PROTO) {
1046 struct ArcProto
1047 *oldp = arc_proto_map[lp->default_proto[pkt.hard.source]],
1048 *newp = arc_proto_map[soft->proto];
1049
1050 if (oldp != newp) {
1051 BUGMSG(D_PROTO,
1052 "got protocol %02Xh; encap for host %02Xh is now '%c'"
1053 " (was '%c')\n", soft->proto, pkt.hard.source,
1054 newp->suffix, oldp->suffix);
1055 }
1056 }
1057
1058 /* broadcasts will always be done with the last-used encap. */
1059 lp->default_proto[0] = soft->proto;
1060
1061 /* in striking contrast, the following isn't a hack. */
1062 lp->default_proto[pkt.hard.source] = soft->proto;
1063 }
1064 /* call the protocol-specific receiver. */
1065 arc_proto_map[soft->proto]->rx(dev, bufnum, &pkt, length);
1066}
1067
1068
1069
1070/*
1071 * Get the current statistics. This may be called with the card open or
1072 * closed.
1073 */
1074static struct net_device_stats *arcnet_get_stats(struct net_device *dev)
1075{
1076 struct arcnet_local *lp = dev->priv;
1077 return &lp->stats;
1078}
1079
1080
1081static void null_rx(struct net_device *dev, int bufnum,
1082 struct archdr *pkthdr, int length)
1083{
1084 BUGMSG(D_PROTO,
1085 "rx: don't know how to deal with proto %02Xh from host %02Xh.\n",
1086 pkthdr->soft.rfc1201.proto, pkthdr->hard.source);
1087}
1088
1089
1090static int null_build_header(struct sk_buff *skb, struct net_device *dev,
1091 unsigned short type, uint8_t daddr)
1092{
1093 struct arcnet_local *lp = dev->priv;
1094
1095 BUGMSG(D_PROTO,
1096 "tx: can't build header for encap %02Xh; load a protocol driver.\n",
1097 lp->default_proto[daddr]);
1098
1099 /* always fails */
1100 return 0;
1101}
1102
1103
1104/* the "do nothing" prepare_tx function warns that there's nothing to do. */
1105static int null_prepare_tx(struct net_device *dev, struct archdr *pkt,
1106 int length, int bufnum)
1107{
1108 struct arcnet_local *lp = dev->priv;
1109 struct arc_hardware newpkt;
1110
1111 BUGMSG(D_PROTO, "tx: no encap for this host; load a protocol driver.\n");
1112
1113 /* send a packet to myself -- will never get received, of course */
1114 newpkt.source = newpkt.dest = dev->dev_addr[0];
1115
1116 /* only one byte of actual data (and it's random) */
1117 newpkt.offset[0] = 0xFF;
1118
1119 lp->hw.copy_to_card(dev, bufnum, 0, &newpkt, ARC_HDR_SIZE);
1120
1121 return 1; /* done */
1122}