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Merge tag 'for-linus-4.2-rc0-tag' of git://git.kernel.org/pub/scm/linux/kernel/git...
[deliverable/linux.git] / drivers / net / arcnet / arcnet.c
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 */
57 static void null_rx(struct net_device *dev, int bufnum,
58 struct archdr *pkthdr, int length);
59 static int null_build_header(struct sk_buff *skb, struct net_device *dev,
60 unsigned short type, uint8_t daddr);
61 static int null_prepare_tx(struct net_device *dev, struct archdr *pkt,
62 int length, int bufnum);
63
64 static 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
75 static 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 */
88 int arcnet_debug = ARCNET_DEBUG;
89
90 EXPORT_SYMBOL(arc_proto_map);
91 EXPORT_SYMBOL(arc_proto_default);
92 EXPORT_SYMBOL(arc_bcast_proto);
93 EXPORT_SYMBOL(arc_raw_proto);
94 EXPORT_SYMBOL(arcnet_unregister_proto);
95 EXPORT_SYMBOL(arcnet_debug);
96 EXPORT_SYMBOL(alloc_arcdev);
97 EXPORT_SYMBOL(arcnet_interrupt);
98 EXPORT_SYMBOL(arcnet_open);
99 EXPORT_SYMBOL(arcnet_close);
100 EXPORT_SYMBOL(arcnet_send_packet);
101 EXPORT_SYMBOL(arcnet_timeout);
102
103 /* Internal function prototypes */
104 static int arcnet_header(struct sk_buff *skb, struct net_device *dev,
105 unsigned short type, const void *daddr,
106 const void *saddr, unsigned len);
107 static int go_tx(struct net_device *dev);
108
109 static int debug = ARCNET_DEBUG;
110 module_param(debug, int, 0);
111 MODULE_LICENSE("GPL");
112
113 static int __init arcnet_init(void)
114 {
115 int count;
116
117 arcnet_debug = debug;
118
119 printk("arcnet loaded.\n");
120
121 #ifdef ALPHA_WARNING
122 BUGLVL(D_EXTRA) {
123 printk("arcnet: ***\n"
124 "arcnet: * Read arcnet.txt for important release notes!\n"
125 "arcnet: *\n"
126 "arcnet: * This is an ALPHA version! (Last stable release: v3.02) E-mail\n"
127 "arcnet: * me if you have any questions, comments, or bug reports.\n"
128 "arcnet: ***\n");
129 }
130 #endif
131
132 /* initialize the protocol map */
133 arc_raw_proto = arc_proto_default = arc_bcast_proto = &arc_proto_null;
134 for (count = 0; count < 256; count++)
135 arc_proto_map[count] = arc_proto_default;
136
137 BUGLVL(D_DURING)
138 printk("arcnet: struct sizes: %Zd %Zd %Zd %Zd %Zd\n",
139 sizeof(struct arc_hardware), sizeof(struct arc_rfc1201),
140 sizeof(struct arc_rfc1051), sizeof(struct arc_eth_encap),
141 sizeof(struct archdr));
142
143 return 0;
144 }
145
146 static void __exit arcnet_exit(void)
147 {
148 }
149
150 module_init(arcnet_init);
151 module_exit(arcnet_exit);
152
153 /*
154 * Dump the contents of an sk_buff
155 */
156 #if ARCNET_DEBUG_MAX & D_SKB
157 void arcnet_dump_skb(struct net_device *dev,
158 struct sk_buff *skb, char *desc)
159 {
160 char hdr[32];
161
162 /* dump the packet */
163 snprintf(hdr, sizeof(hdr), "%6s:%s skb->data:", dev->name, desc);
164 print_hex_dump(KERN_DEBUG, hdr, DUMP_PREFIX_OFFSET,
165 16, 1, skb->data, skb->len, true);
166 }
167
168 EXPORT_SYMBOL(arcnet_dump_skb);
169 #endif
170
171
172 /*
173 * Dump the contents of an ARCnet buffer
174 */
175 #if (ARCNET_DEBUG_MAX & (D_RX | D_TX))
176 static void arcnet_dump_packet(struct net_device *dev, int bufnum,
177 char *desc, int take_arcnet_lock)
178 {
179 struct arcnet_local *lp = netdev_priv(dev);
180 int i, length;
181 unsigned long flags = 0;
182 static uint8_t buf[512];
183 char hdr[32];
184
185 /* hw.copy_from_card expects IRQ context so take the IRQ lock
186 to keep it single threaded */
187 if(take_arcnet_lock)
188 spin_lock_irqsave(&lp->lock, flags);
189
190 lp->hw.copy_from_card(dev, bufnum, 0, buf, 512);
191 if(take_arcnet_lock)
192 spin_unlock_irqrestore(&lp->lock, flags);
193
194 /* if the offset[0] byte is nonzero, this is a 256-byte packet */
195 length = (buf[2] ? 256 : 512);
196
197 /* dump the packet */
198 snprintf(hdr, sizeof(hdr), "%6s:%s packet dump:", dev->name, desc);
199 print_hex_dump(KERN_DEBUG, hdr, DUMP_PREFIX_OFFSET,
200 16, 1, buf, length, true);
201 }
202
203 #else
204
205 #define arcnet_dump_packet(dev, bufnum, desc,take_arcnet_lock) do { } while (0)
206
207 #endif
208
209
210 /*
211 * Unregister a protocol driver from the arc_proto_map. Protocol drivers
212 * are responsible for registering themselves, but the unregister routine
213 * is pretty generic so we'll do it here.
214 */
215 void arcnet_unregister_proto(struct ArcProto *proto)
216 {
217 int count;
218
219 if (arc_proto_default == proto)
220 arc_proto_default = &arc_proto_null;
221 if (arc_bcast_proto == proto)
222 arc_bcast_proto = arc_proto_default;
223 if (arc_raw_proto == proto)
224 arc_raw_proto = arc_proto_default;
225
226 for (count = 0; count < 256; count++) {
227 if (arc_proto_map[count] == proto)
228 arc_proto_map[count] = arc_proto_default;
229 }
230 }
231
232
233 /*
234 * Add a buffer to the queue. Only the interrupt handler is allowed to do
235 * this, unless interrupts are disabled.
236 *
237 * Note: we don't check for a full queue, since there aren't enough buffers
238 * to more than fill it.
239 */
240 static void release_arcbuf(struct net_device *dev, int bufnum)
241 {
242 struct arcnet_local *lp = netdev_priv(dev);
243 int i;
244
245 lp->buf_queue[lp->first_free_buf++] = bufnum;
246 lp->first_free_buf %= 5;
247
248 BUGLVL(D_DURING) {
249 BUGMSG(D_DURING, "release_arcbuf: freed #%d; buffer queue is now: ",
250 bufnum);
251 for (i = lp->next_buf; i != lp->first_free_buf; i = (i+1) % 5)
252 BUGMSG2(D_DURING, "#%d ", lp->buf_queue[i]);
253 BUGMSG2(D_DURING, "\n");
254 }
255 }
256
257
258 /*
259 * Get a buffer from the queue. If this returns -1, there are no buffers
260 * available.
261 */
262 static int get_arcbuf(struct net_device *dev)
263 {
264 struct arcnet_local *lp = netdev_priv(dev);
265 int buf = -1, i;
266
267 if (!atomic_dec_and_test(&lp->buf_lock)) {
268 /* already in this function */
269 BUGMSG(D_NORMAL, "get_arcbuf: overlap (%d)!\n",
270 lp->buf_lock.counter);
271 }
272 else { /* we can continue */
273 if (lp->next_buf >= 5)
274 lp->next_buf -= 5;
275
276 if (lp->next_buf == lp->first_free_buf)
277 BUGMSG(D_NORMAL, "get_arcbuf: BUG: no buffers are available??\n");
278 else {
279 buf = lp->buf_queue[lp->next_buf++];
280 lp->next_buf %= 5;
281 }
282 }
283
284
285 BUGLVL(D_DURING) {
286 BUGMSG(D_DURING, "get_arcbuf: got #%d; buffer queue is now: ", buf);
287 for (i = lp->next_buf; i != lp->first_free_buf; i = (i+1) % 5)
288 BUGMSG2(D_DURING, "#%d ", lp->buf_queue[i]);
289 BUGMSG2(D_DURING, "\n");
290 }
291
292 atomic_inc(&lp->buf_lock);
293 return buf;
294 }
295
296
297 static int choose_mtu(void)
298 {
299 int count, mtu = 65535;
300
301 /* choose the smallest MTU of all available encaps */
302 for (count = 0; count < 256; count++) {
303 if (arc_proto_map[count] != &arc_proto_null &&
304 arc_proto_map[count]->mtu < mtu) {
305 mtu = arc_proto_map[count]->mtu;
306 }
307 }
308
309 return mtu == 65535 ? XMTU : mtu;
310 }
311
312 static const struct header_ops arcnet_header_ops = {
313 .create = arcnet_header,
314 };
315
316 static const struct net_device_ops arcnet_netdev_ops = {
317 .ndo_open = arcnet_open,
318 .ndo_stop = arcnet_close,
319 .ndo_start_xmit = arcnet_send_packet,
320 .ndo_tx_timeout = arcnet_timeout,
321 };
322
323 /* Setup a struct device for ARCnet. */
324 static void arcdev_setup(struct net_device *dev)
325 {
326 dev->type = ARPHRD_ARCNET;
327 dev->netdev_ops = &arcnet_netdev_ops;
328 dev->header_ops = &arcnet_header_ops;
329 dev->hard_header_len = sizeof(struct archdr);
330 dev->mtu = choose_mtu();
331
332 dev->addr_len = ARCNET_ALEN;
333 dev->tx_queue_len = 100;
334 dev->broadcast[0] = 0x00; /* for us, broadcasts are address 0 */
335 dev->watchdog_timeo = TX_TIMEOUT;
336
337 /* New-style flags. */
338 dev->flags = IFF_BROADCAST;
339
340 }
341
342 struct net_device *alloc_arcdev(const char *name)
343 {
344 struct net_device *dev;
345
346 dev = alloc_netdev(sizeof(struct arcnet_local),
347 name && *name ? name : "arc%d", NET_NAME_UNKNOWN,
348 arcdev_setup);
349 if(dev) {
350 struct arcnet_local *lp = netdev_priv(dev);
351 spin_lock_init(&lp->lock);
352 }
353
354 return dev;
355 }
356
357 /*
358 * Open/initialize the board. This is called sometime after booting when
359 * the 'ifconfig' program is run.
360 *
361 * This routine should set everything up anew at each open, even registers
362 * that "should" only need to be set once at boot, so that there is
363 * non-reboot way to recover if something goes wrong.
364 */
365 int arcnet_open(struct net_device *dev)
366 {
367 struct arcnet_local *lp = netdev_priv(dev);
368 int count, newmtu, error;
369
370 BUGMSG(D_INIT,"opened.");
371
372 if (!try_module_get(lp->hw.owner))
373 return -ENODEV;
374
375 BUGLVL(D_PROTO) {
376 BUGMSG(D_PROTO, "protocol map (default is '%c'): ",
377 arc_proto_default->suffix);
378 for (count = 0; count < 256; count++)
379 BUGMSG2(D_PROTO, "%c", arc_proto_map[count]->suffix);
380 BUGMSG2(D_PROTO, "\n");
381 }
382
383
384 BUGMSG(D_INIT, "arcnet_open: resetting card.\n");
385
386 /* try to put the card in a defined state - if it fails the first
387 * time, actually reset it.
388 */
389 error = -ENODEV;
390 if (ARCRESET(0) && ARCRESET(1))
391 goto out_module_put;
392
393 newmtu = choose_mtu();
394 if (newmtu < dev->mtu)
395 dev->mtu = newmtu;
396
397 BUGMSG(D_INIT, "arcnet_open: mtu: %d.\n", dev->mtu);
398
399 /* autodetect the encapsulation for each host. */
400 memset(lp->default_proto, 0, sizeof(lp->default_proto));
401
402 /* the broadcast address is special - use the 'bcast' protocol */
403 for (count = 0; count < 256; count++) {
404 if (arc_proto_map[count] == arc_bcast_proto) {
405 lp->default_proto[0] = count;
406 break;
407 }
408 }
409
410 /* initialize buffers */
411 atomic_set(&lp->buf_lock, 1);
412
413 lp->next_buf = lp->first_free_buf = 0;
414 release_arcbuf(dev, 0);
415 release_arcbuf(dev, 1);
416 release_arcbuf(dev, 2);
417 release_arcbuf(dev, 3);
418 lp->cur_tx = lp->next_tx = -1;
419 lp->cur_rx = -1;
420
421 lp->rfc1201.sequence = 1;
422
423 /* bring up the hardware driver */
424 if (lp->hw.open)
425 lp->hw.open(dev);
426
427 if (dev->dev_addr[0] == 0)
428 BUGMSG(D_NORMAL, "WARNING! Station address 00 is reserved "
429 "for broadcasts!\n");
430 else if (dev->dev_addr[0] == 255)
431 BUGMSG(D_NORMAL, "WARNING! Station address FF may confuse "
432 "DOS networking programs!\n");
433
434 BUGMSG(D_DEBUG, "%s: %d: %s\n",__FILE__,__LINE__,__func__);
435 if (ASTATUS() & RESETflag) {
436 BUGMSG(D_DEBUG, "%s: %d: %s\n",__FILE__,__LINE__,__func__);
437 ACOMMAND(CFLAGScmd | RESETclear);
438 }
439
440
441 BUGMSG(D_DEBUG, "%s: %d: %s\n",__FILE__,__LINE__,__func__);
442 /* make sure we're ready to receive IRQ's. */
443 AINTMASK(0);
444 udelay(1); /* give it time to set the mask before
445 * we reset it again. (may not even be
446 * necessary)
447 */
448 BUGMSG(D_DEBUG, "%s: %d: %s\n",__FILE__,__LINE__,__func__);
449 lp->intmask = NORXflag | RECONflag;
450 AINTMASK(lp->intmask);
451 BUGMSG(D_DEBUG, "%s: %d: %s\n",__FILE__,__LINE__,__func__);
452
453 netif_start_queue(dev);
454
455 return 0;
456
457 out_module_put:
458 module_put(lp->hw.owner);
459 return error;
460 }
461
462
463 /* The inverse routine to arcnet_open - shuts down the card. */
464 int arcnet_close(struct net_device *dev)
465 {
466 struct arcnet_local *lp = netdev_priv(dev);
467
468 netif_stop_queue(dev);
469
470 /* flush TX and disable RX */
471 AINTMASK(0);
472 ACOMMAND(NOTXcmd); /* stop transmit */
473 ACOMMAND(NORXcmd); /* disable receive */
474 mdelay(1);
475
476 /* shut down the card */
477 lp->hw.close(dev);
478 module_put(lp->hw.owner);
479 return 0;
480 }
481
482
483 static int arcnet_header(struct sk_buff *skb, struct net_device *dev,
484 unsigned short type, const void *daddr,
485 const void *saddr, unsigned len)
486 {
487 const struct arcnet_local *lp = netdev_priv(dev);
488 uint8_t _daddr, proto_num;
489 struct ArcProto *proto;
490
491 BUGMSG(D_DURING,
492 "create header from %d to %d; protocol %d (%Xh); size %u.\n",
493 saddr ? *(uint8_t *) saddr : -1,
494 daddr ? *(uint8_t *) daddr : -1,
495 type, type, len);
496
497 if (skb->len!=0 && len != skb->len)
498 BUGMSG(D_NORMAL, "arcnet_header: Yikes! skb->len(%d) != len(%d)!\n",
499 skb->len, len);
500
501
502 /* Type is host order - ? */
503 if(type == ETH_P_ARCNET) {
504 proto = arc_raw_proto;
505 BUGMSG(D_DEBUG, "arc_raw_proto used. proto='%c'\n",proto->suffix);
506 _daddr = daddr ? *(uint8_t *) daddr : 0;
507 }
508 else if (!daddr) {
509 /*
510 * if the dest addr isn't provided, we can't choose an encapsulation!
511 * Store the packet type (eg. ETH_P_IP) for now, and we'll push on a
512 * real header when we do rebuild_header.
513 */
514 *(uint16_t *) skb_push(skb, 2) = type;
515 /*
516 * XXX: Why not use skb->mac_len?
517 */
518 if (skb->network_header - skb->mac_header != 2)
519 BUGMSG(D_NORMAL, "arcnet_header: Yikes! diff (%d) is not 2!\n",
520 (int)(skb->network_header - skb->mac_header));
521 return -2; /* return error -- can't transmit yet! */
522 }
523 else {
524 /* otherwise, we can just add the header as usual. */
525 _daddr = *(uint8_t *) daddr;
526 proto_num = lp->default_proto[_daddr];
527 proto = arc_proto_map[proto_num];
528 BUGMSG(D_DURING, "building header for %02Xh using protocol '%c'\n",
529 proto_num, proto->suffix);
530 if (proto == &arc_proto_null && arc_bcast_proto != proto) {
531 BUGMSG(D_DURING, "actually, let's use '%c' instead.\n",
532 arc_bcast_proto->suffix);
533 proto = arc_bcast_proto;
534 }
535 }
536 return proto->build_header(skb, dev, type, _daddr);
537 }
538
539 /* Called by the kernel in order to transmit a packet. */
540 netdev_tx_t arcnet_send_packet(struct sk_buff *skb,
541 struct net_device *dev)
542 {
543 struct arcnet_local *lp = netdev_priv(dev);
544 struct archdr *pkt;
545 struct arc_rfc1201 *soft;
546 struct ArcProto *proto;
547 int txbuf;
548 unsigned long flags;
549 int freeskb, retval;
550
551 BUGMSG(D_DURING,
552 "transmit requested (status=%Xh, txbufs=%d/%d, len=%d, protocol %x)\n",
553 ASTATUS(), lp->cur_tx, lp->next_tx, skb->len,skb->protocol);
554
555 pkt = (struct archdr *) skb->data;
556 soft = &pkt->soft.rfc1201;
557 proto = arc_proto_map[soft->proto];
558
559 BUGMSG(D_SKB_SIZE, "skb: transmitting %d bytes to %02X\n",
560 skb->len, pkt->hard.dest);
561 BUGLVL(D_SKB) arcnet_dump_skb(dev, skb, "tx");
562
563 /* fits in one packet? */
564 if (skb->len - ARC_HDR_SIZE > XMTU && !proto->continue_tx) {
565 BUGMSG(D_NORMAL, "fixme: packet too large: compensating badly!\n");
566 dev_kfree_skb(skb);
567 return NETDEV_TX_OK; /* don't try again */
568 }
569
570 /* We're busy transmitting a packet... */
571 netif_stop_queue(dev);
572
573 spin_lock_irqsave(&lp->lock, flags);
574 AINTMASK(0);
575 if(lp->next_tx == -1)
576 txbuf = get_arcbuf(dev);
577 else {
578 txbuf = -1;
579 }
580 if (txbuf != -1) {
581 if (proto->prepare_tx(dev, pkt, skb->len, txbuf) &&
582 !proto->ack_tx) {
583 /* done right away and we don't want to acknowledge
584 the package later - forget about it now */
585 dev->stats.tx_bytes += skb->len;
586 freeskb = 1;
587 } else {
588 /* do it the 'split' way */
589 lp->outgoing.proto = proto;
590 lp->outgoing.skb = skb;
591 lp->outgoing.pkt = pkt;
592
593 freeskb = 0;
594
595 if (proto->continue_tx &&
596 proto->continue_tx(dev, txbuf)) {
597 BUGMSG(D_NORMAL,
598 "bug! continue_tx finished the first time! "
599 "(proto='%c')\n", proto->suffix);
600 }
601 }
602 retval = NETDEV_TX_OK;
603 lp->next_tx = txbuf;
604 } else {
605 retval = NETDEV_TX_BUSY;
606 freeskb = 0;
607 }
608
609 BUGMSG(D_DEBUG, "%s: %d: %s, status: %x\n",__FILE__,__LINE__,__func__,ASTATUS());
610 /* make sure we didn't ignore a TX IRQ while we were in here */
611 AINTMASK(0);
612
613 BUGMSG(D_DEBUG, "%s: %d: %s\n",__FILE__,__LINE__,__func__);
614 lp->intmask |= TXFREEflag|EXCNAKflag;
615 AINTMASK(lp->intmask);
616 BUGMSG(D_DEBUG, "%s: %d: %s, status: %x\n",__FILE__,__LINE__,__func__,ASTATUS());
617
618 spin_unlock_irqrestore(&lp->lock, flags);
619 if (freeskb) {
620 dev_kfree_skb(skb);
621 }
622 return retval; /* no need to try again */
623 }
624
625
626 /*
627 * Actually start transmitting a packet that was loaded into a buffer
628 * by prepare_tx. This should _only_ be called by the interrupt handler.
629 */
630 static int go_tx(struct net_device *dev)
631 {
632 struct arcnet_local *lp = netdev_priv(dev);
633
634 BUGMSG(D_DURING, "go_tx: status=%Xh, intmask=%Xh, next_tx=%d, cur_tx=%d\n",
635 ASTATUS(), lp->intmask, lp->next_tx, lp->cur_tx);
636
637 if (lp->cur_tx != -1 || lp->next_tx == -1)
638 return 0;
639
640 BUGLVL(D_TX) arcnet_dump_packet(dev, lp->next_tx, "go_tx", 0);
641
642 lp->cur_tx = lp->next_tx;
643 lp->next_tx = -1;
644
645 /* start sending */
646 ACOMMAND(TXcmd | (lp->cur_tx << 3));
647
648 dev->stats.tx_packets++;
649 lp->lasttrans_dest = lp->lastload_dest;
650 lp->lastload_dest = 0;
651 lp->excnak_pending = 0;
652 lp->intmask |= TXFREEflag|EXCNAKflag;
653
654 return 1;
655 }
656
657
658 /* Called by the kernel when transmit times out */
659 void arcnet_timeout(struct net_device *dev)
660 {
661 unsigned long flags;
662 struct arcnet_local *lp = netdev_priv(dev);
663 int status = ASTATUS();
664 char *msg;
665
666 spin_lock_irqsave(&lp->lock, flags);
667 if (status & TXFREEflag) { /* transmit _DID_ finish */
668 msg = " - missed IRQ?";
669 } else {
670 msg = "";
671 dev->stats.tx_aborted_errors++;
672 lp->timed_out = 1;
673 ACOMMAND(NOTXcmd | (lp->cur_tx << 3));
674 }
675 dev->stats.tx_errors++;
676
677 /* make sure we didn't miss a TX or a EXC NAK IRQ */
678 AINTMASK(0);
679 lp->intmask |= TXFREEflag|EXCNAKflag;
680 AINTMASK(lp->intmask);
681
682 spin_unlock_irqrestore(&lp->lock, flags);
683
684 if (time_after(jiffies, lp->last_timeout + 10*HZ)) {
685 BUGMSG(D_EXTRA, "tx timed out%s (status=%Xh, intmask=%Xh, dest=%02Xh)\n",
686 msg, status, lp->intmask, lp->lasttrans_dest);
687 lp->last_timeout = jiffies;
688 }
689
690 if (lp->cur_tx == -1)
691 netif_wake_queue(dev);
692 }
693
694
695 /*
696 * The typical workload of the driver: Handle the network interface
697 * interrupts. Establish which device needs attention, and call the correct
698 * chipset interrupt handler.
699 */
700 irqreturn_t arcnet_interrupt(int irq, void *dev_id)
701 {
702 struct net_device *dev = dev_id;
703 struct arcnet_local *lp;
704 int recbuf, status, diagstatus, didsomething, boguscount;
705 int retval = IRQ_NONE;
706
707 BUGMSG(D_DURING, "\n");
708
709 BUGMSG(D_DURING, "in arcnet_interrupt\n");
710
711 lp = netdev_priv(dev);
712 BUG_ON(!lp);
713
714 spin_lock(&lp->lock);
715
716 /*
717 * RESET flag was enabled - if device is not running, we must clear it right
718 * away (but nothing else).
719 */
720 if (!netif_running(dev)) {
721 if (ASTATUS() & RESETflag)
722 ACOMMAND(CFLAGScmd | RESETclear);
723 AINTMASK(0);
724 spin_unlock(&lp->lock);
725 return retval;
726 }
727
728 BUGMSG(D_DURING, "in arcnet_inthandler (status=%Xh, intmask=%Xh)\n",
729 ASTATUS(), lp->intmask);
730
731 boguscount = 5;
732 do {
733 status = ASTATUS();
734 diagstatus = (status >> 8) & 0xFF;
735
736 BUGMSG(D_DEBUG, "%s: %d: %s: status=%x\n",
737 __FILE__,__LINE__,__func__,status);
738 didsomething = 0;
739
740 /*
741 * RESET flag was enabled - card is resetting and if RX is
742 * disabled, it's NOT because we just got a packet.
743 *
744 * The card is in an undefined state. Clear it out and start over.
745 */
746 if (status & RESETflag) {
747 BUGMSG(D_NORMAL, "spurious reset (status=%Xh)\n", status);
748 arcnet_close(dev);
749 arcnet_open(dev);
750
751 /* get out of the interrupt handler! */
752 break;
753 }
754 /*
755 * RX is inhibited - we must have received something. Prepare to
756 * receive into the next buffer.
757 *
758 * We don't actually copy the received packet from the card until
759 * after the transmit handler runs (and possibly launches the next
760 * tx); this should improve latency slightly if we get both types
761 * of interrupts at once.
762 */
763 recbuf = -1;
764 if (status & lp->intmask & NORXflag) {
765 recbuf = lp->cur_rx;
766 BUGMSG(D_DURING, "Buffer #%d: receive irq (status=%Xh)\n",
767 recbuf, status);
768
769 lp->cur_rx = get_arcbuf(dev);
770 if (lp->cur_rx != -1) {
771 BUGMSG(D_DURING, "enabling receive to buffer #%d\n",
772 lp->cur_rx);
773 ACOMMAND(RXcmd | (lp->cur_rx << 3) | RXbcasts);
774 }
775 didsomething++;
776 }
777
778 if((diagstatus & EXCNAKflag)) {
779 BUGMSG(D_DURING, "EXCNAK IRQ (diagstat=%Xh)\n",
780 diagstatus);
781
782 ACOMMAND(NOTXcmd); /* disable transmit */
783 lp->excnak_pending = 1;
784
785 ACOMMAND(EXCNAKclear);
786 lp->intmask &= ~(EXCNAKflag);
787 didsomething++;
788 }
789
790
791 /* a transmit finished, and we're interested in it. */
792 if ((status & lp->intmask & TXFREEflag) || lp->timed_out) {
793 lp->intmask &= ~(TXFREEflag|EXCNAKflag);
794
795 BUGMSG(D_DURING, "TX IRQ (stat=%Xh)\n", status);
796
797 if (lp->cur_tx != -1 && !lp->timed_out) {
798 if(!(status & TXACKflag)) {
799 if (lp->lasttrans_dest != 0) {
800 BUGMSG(D_EXTRA,
801 "transmit was not acknowledged! "
802 "(status=%Xh, dest=%02Xh)\n",
803 status, lp->lasttrans_dest);
804 dev->stats.tx_errors++;
805 dev->stats.tx_carrier_errors++;
806 } else {
807 BUGMSG(D_DURING,
808 "broadcast was not acknowledged; that's normal "
809 "(status=%Xh, dest=%02Xh)\n",
810 status, lp->lasttrans_dest);
811 }
812 }
813
814 if (lp->outgoing.proto &&
815 lp->outgoing.proto->ack_tx) {
816 int ackstatus;
817 if(status & TXACKflag)
818 ackstatus=2;
819 else if(lp->excnak_pending)
820 ackstatus=1;
821 else
822 ackstatus=0;
823
824 lp->outgoing.proto
825 ->ack_tx(dev, ackstatus);
826 }
827 }
828 if (lp->cur_tx != -1)
829 release_arcbuf(dev, lp->cur_tx);
830
831 lp->cur_tx = -1;
832 lp->timed_out = 0;
833 didsomething++;
834
835 /* send another packet if there is one */
836 go_tx(dev);
837
838 /* continue a split packet, if any */
839 if (lp->outgoing.proto && lp->outgoing.proto->continue_tx) {
840 int txbuf = get_arcbuf(dev);
841 if (txbuf != -1) {
842 if (lp->outgoing.proto->continue_tx(dev, txbuf)) {
843 /* that was the last segment */
844 dev->stats.tx_bytes += lp->outgoing.skb->len;
845 if(!lp->outgoing.proto->ack_tx)
846 {
847 dev_kfree_skb_irq(lp->outgoing.skb);
848 lp->outgoing.proto = NULL;
849 }
850 }
851 lp->next_tx = txbuf;
852 }
853 }
854 /* inform upper layers of idleness, if necessary */
855 if (lp->cur_tx == -1)
856 netif_wake_queue(dev);
857 }
858 /* now process the received packet, if any */
859 if (recbuf != -1) {
860 BUGLVL(D_RX) arcnet_dump_packet(dev, recbuf, "rx irq", 0);
861
862 arcnet_rx(dev, recbuf);
863 release_arcbuf(dev, recbuf);
864
865 didsomething++;
866 }
867 if (status & lp->intmask & RECONflag) {
868 ACOMMAND(CFLAGScmd | CONFIGclear);
869 dev->stats.tx_carrier_errors++;
870
871 BUGMSG(D_RECON, "Network reconfiguration detected (status=%Xh)\n",
872 status);
873 /* MYRECON bit is at bit 7 of diagstatus */
874 if(diagstatus & 0x80)
875 BUGMSG(D_RECON,"Put out that recon myself\n");
876
877 /* is the RECON info empty or old? */
878 if (!lp->first_recon || !lp->last_recon ||
879 time_after(jiffies, lp->last_recon + HZ * 10)) {
880 if (lp->network_down)
881 BUGMSG(D_NORMAL, "reconfiguration detected: cabling restored?\n");
882 lp->first_recon = lp->last_recon = jiffies;
883 lp->num_recons = lp->network_down = 0;
884
885 BUGMSG(D_DURING, "recon: clearing counters.\n");
886 } else { /* add to current RECON counter */
887 lp->last_recon = jiffies;
888 lp->num_recons++;
889
890 BUGMSG(D_DURING, "recon: counter=%d, time=%lds, net=%d\n",
891 lp->num_recons,
892 (lp->last_recon - lp->first_recon) / HZ,
893 lp->network_down);
894
895 /* if network is marked up;
896 * and first_recon and last_recon are 60+ apart;
897 * and the average no. of recons counted is
898 * > RECON_THRESHOLD/min;
899 * then print a warning message.
900 */
901 if (!lp->network_down &&
902 (lp->last_recon - lp->first_recon) <= HZ * 60 &&
903 lp->num_recons >= RECON_THRESHOLD) {
904 lp->network_down = 1;
905 BUGMSG(D_NORMAL, "many reconfigurations detected: cabling problem?\n");
906 } else if (!lp->network_down &&
907 lp->last_recon - lp->first_recon > HZ * 60) {
908 /* reset counters if we've gone for over a minute. */
909 lp->first_recon = lp->last_recon;
910 lp->num_recons = 1;
911 }
912 }
913 } else if (lp->network_down &&
914 time_after(jiffies, lp->last_recon + HZ * 10)) {
915 if (lp->network_down)
916 BUGMSG(D_NORMAL, "cabling restored?\n");
917 lp->first_recon = lp->last_recon = 0;
918 lp->num_recons = lp->network_down = 0;
919
920 BUGMSG(D_DURING, "not recon: clearing counters anyway.\n");
921 }
922
923 if(didsomething) {
924 retval |= IRQ_HANDLED;
925 }
926 }
927 while (--boguscount && didsomething);
928
929 BUGMSG(D_DURING, "arcnet_interrupt complete (status=%Xh, count=%d)\n",
930 ASTATUS(), boguscount);
931 BUGMSG(D_DURING, "\n");
932
933
934 AINTMASK(0);
935 udelay(1);
936 AINTMASK(lp->intmask);
937
938 spin_unlock(&lp->lock);
939 return retval;
940 }
941
942
943 /*
944 * This is a generic packet receiver that calls arcnet??_rx depending on the
945 * protocol ID found.
946 */
947 static void arcnet_rx(struct net_device *dev, int bufnum)
948 {
949 struct arcnet_local *lp = netdev_priv(dev);
950 struct archdr pkt;
951 struct arc_rfc1201 *soft;
952 int length, ofs;
953
954 soft = &pkt.soft.rfc1201;
955
956 lp->hw.copy_from_card(dev, bufnum, 0, &pkt, ARC_HDR_SIZE);
957 if (pkt.hard.offset[0]) {
958 ofs = pkt.hard.offset[0];
959 length = 256 - ofs;
960 } else {
961 ofs = pkt.hard.offset[1];
962 length = 512 - ofs;
963 }
964
965 /* get the full header, if possible */
966 if (sizeof(pkt.soft) <= length)
967 lp->hw.copy_from_card(dev, bufnum, ofs, soft, sizeof(pkt.soft));
968 else {
969 memset(&pkt.soft, 0, sizeof(pkt.soft));
970 lp->hw.copy_from_card(dev, bufnum, ofs, soft, length);
971 }
972
973 BUGMSG(D_DURING, "Buffer #%d: received packet from %02Xh to %02Xh "
974 "(%d+4 bytes)\n",
975 bufnum, pkt.hard.source, pkt.hard.dest, length);
976
977 dev->stats.rx_packets++;
978 dev->stats.rx_bytes += length + ARC_HDR_SIZE;
979
980 /* call the right receiver for the protocol */
981 if (arc_proto_map[soft->proto]->is_ip) {
982 BUGLVL(D_PROTO) {
983 struct ArcProto
984 *oldp = arc_proto_map[lp->default_proto[pkt.hard.source]],
985 *newp = arc_proto_map[soft->proto];
986
987 if (oldp != newp) {
988 BUGMSG(D_PROTO,
989 "got protocol %02Xh; encap for host %02Xh is now '%c'"
990 " (was '%c')\n", soft->proto, pkt.hard.source,
991 newp->suffix, oldp->suffix);
992 }
993 }
994
995 /* broadcasts will always be done with the last-used encap. */
996 lp->default_proto[0] = soft->proto;
997
998 /* in striking contrast, the following isn't a hack. */
999 lp->default_proto[pkt.hard.source] = soft->proto;
1000 }
1001 /* call the protocol-specific receiver. */
1002 arc_proto_map[soft->proto]->rx(dev, bufnum, &pkt, length);
1003 }
1004
1005
1006 static void null_rx(struct net_device *dev, int bufnum,
1007 struct archdr *pkthdr, int length)
1008 {
1009 BUGMSG(D_PROTO,
1010 "rx: don't know how to deal with proto %02Xh from host %02Xh.\n",
1011 pkthdr->soft.rfc1201.proto, pkthdr->hard.source);
1012 }
1013
1014
1015 static int null_build_header(struct sk_buff *skb, struct net_device *dev,
1016 unsigned short type, uint8_t daddr)
1017 {
1018 struct arcnet_local *lp = netdev_priv(dev);
1019
1020 BUGMSG(D_PROTO,
1021 "tx: can't build header for encap %02Xh; load a protocol driver.\n",
1022 lp->default_proto[daddr]);
1023
1024 /* always fails */
1025 return 0;
1026 }
1027
1028
1029 /* the "do nothing" prepare_tx function warns that there's nothing to do. */
1030 static int null_prepare_tx(struct net_device *dev, struct archdr *pkt,
1031 int length, int bufnum)
1032 {
1033 struct arcnet_local *lp = netdev_priv(dev);
1034 struct arc_hardware newpkt;
1035
1036 BUGMSG(D_PROTO, "tx: no encap for this host; load a protocol driver.\n");
1037
1038 /* send a packet to myself -- will never get received, of course */
1039 newpkt.source = newpkt.dest = dev->dev_addr[0];
1040
1041 /* only one byte of actual data (and it's random) */
1042 newpkt.offset[0] = 0xFF;
1043
1044 lp->hw.copy_to_card(dev, bufnum, 0, &newpkt, ARC_HDR_SIZE);
1045
1046 return 1; /* done */
1047 }
Linux kernel - Deliverables
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