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[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 /* one ArcProto per possible proto ID. None of the elements of
67 * arc_proto_map are allowed to be NULL; they will get set to
68 * arc_proto_default instead. It also must not be NULL; if you would like
69 * to set it to NULL, set it to &arc_proto_null instead.
70 */
71 struct ArcProto *arc_proto_map[256], *arc_proto_default,
72 *arc_bcast_proto, *arc_raw_proto;
73
74 static struct ArcProto arc_proto_null = {
75 .suffix = '?',
76 .mtu = XMTU,
77 .is_ip = 0,
78 .rx = null_rx,
79 .build_header = null_build_header,
80 .prepare_tx = null_prepare_tx,
81 .continue_tx = NULL,
82 .ack_tx = NULL
83 };
84
85 /* Exported function prototypes */
86 int arcnet_debug = ARCNET_DEBUG;
87
88 EXPORT_SYMBOL(arc_proto_map);
89 EXPORT_SYMBOL(arc_proto_default);
90 EXPORT_SYMBOL(arc_bcast_proto);
91 EXPORT_SYMBOL(arc_raw_proto);
92 EXPORT_SYMBOL(arcnet_unregister_proto);
93 EXPORT_SYMBOL(arcnet_debug);
94 EXPORT_SYMBOL(alloc_arcdev);
95 EXPORT_SYMBOL(arcnet_interrupt);
96 EXPORT_SYMBOL(arcnet_open);
97 EXPORT_SYMBOL(arcnet_close);
98 EXPORT_SYMBOL(arcnet_send_packet);
99 EXPORT_SYMBOL(arcnet_timeout);
100
101 /* Internal function prototypes */
102 static int arcnet_header(struct sk_buff *skb, struct net_device *dev,
103 unsigned short type, const void *daddr,
104 const void *saddr, unsigned len);
105 static int go_tx(struct net_device *dev);
106
107 static int debug = ARCNET_DEBUG;
108 module_param(debug, int, 0);
109 MODULE_LICENSE("GPL");
110
111 static int __init arcnet_init(void)
112 {
113 int count;
114
115 arcnet_debug = debug;
116
117 printk("arcnet loaded.\n");
118
119 #ifdef ALPHA_WARNING
120 BUGLVL(D_EXTRA) {
121 printk("arcnet: ***\n"
122 "arcnet: * Read arcnet.txt for important release notes!\n"
123 "arcnet: *\n"
124 "arcnet: * This is an ALPHA version! (Last stable release: v3.02) E-mail\n"
125 "arcnet: * me if you have any questions, comments, or bug reports.\n"
126 "arcnet: ***\n");
127 }
128 #endif
129
130 /* initialize the protocol map */
131 arc_raw_proto = arc_proto_default = arc_bcast_proto = &arc_proto_null;
132 for (count = 0; count < 256; count++)
133 arc_proto_map[count] = arc_proto_default;
134
135 BUGLVL(D_DURING)
136 printk("arcnet: struct sizes: %Zd %Zd %Zd %Zd %Zd\n",
137 sizeof(struct arc_hardware), sizeof(struct arc_rfc1201),
138 sizeof(struct arc_rfc1051), sizeof(struct arc_eth_encap),
139 sizeof(struct archdr));
140
141 return 0;
142 }
143
144 static void __exit arcnet_exit(void)
145 {
146 }
147
148 module_init(arcnet_init);
149 module_exit(arcnet_exit);
150
151 /* Dump the contents of an sk_buff */
152 #if ARCNET_DEBUG_MAX & D_SKB
153 void arcnet_dump_skb(struct net_device *dev,
154 struct sk_buff *skb, char *desc)
155 {
156 char hdr[32];
157
158 /* dump the packet */
159 snprintf(hdr, sizeof(hdr), "%6s:%s skb->data:", dev->name, desc);
160 print_hex_dump(KERN_DEBUG, hdr, DUMP_PREFIX_OFFSET,
161 16, 1, skb->data, skb->len, true);
162 }
163
164 EXPORT_SYMBOL(arcnet_dump_skb);
165 #endif
166
167 /* Dump the contents of an ARCnet buffer */
168 #if (ARCNET_DEBUG_MAX & (D_RX | D_TX))
169 static void arcnet_dump_packet(struct net_device *dev, int bufnum,
170 char *desc, int take_arcnet_lock)
171 {
172 struct arcnet_local *lp = netdev_priv(dev);
173 int i, length;
174 unsigned long flags = 0;
175 static uint8_t buf[512];
176 char hdr[32];
177
178 /* hw.copy_from_card expects IRQ context so take the IRQ lock
179 * to keep it single threaded
180 */
181 if (take_arcnet_lock)
182 spin_lock_irqsave(&lp->lock, flags);
183
184 lp->hw.copy_from_card(dev, bufnum, 0, buf, 512);
185 if (take_arcnet_lock)
186 spin_unlock_irqrestore(&lp->lock, flags);
187
188 /* if the offset[0] byte is nonzero, this is a 256-byte packet */
189 length = (buf[2] ? 256 : 512);
190
191 /* dump the packet */
192 snprintf(hdr, sizeof(hdr), "%6s:%s packet dump:", dev->name, desc);
193 print_hex_dump(KERN_DEBUG, hdr, DUMP_PREFIX_OFFSET,
194 16, 1, buf, length, true);
195 }
196
197 #else
198
199 #define arcnet_dump_packet(dev, bufnum, desc, take_arcnet_lock) do { } while (0)
200
201 #endif
202
203 /* Unregister a protocol driver from the arc_proto_map. Protocol drivers
204 * are responsible for registering themselves, but the unregister routine
205 * is pretty generic so we'll do it here.
206 */
207 void arcnet_unregister_proto(struct ArcProto *proto)
208 {
209 int count;
210
211 if (arc_proto_default == proto)
212 arc_proto_default = &arc_proto_null;
213 if (arc_bcast_proto == proto)
214 arc_bcast_proto = arc_proto_default;
215 if (arc_raw_proto == proto)
216 arc_raw_proto = arc_proto_default;
217
218 for (count = 0; count < 256; count++) {
219 if (arc_proto_map[count] == proto)
220 arc_proto_map[count] = arc_proto_default;
221 }
222 }
223
224 /* Add a buffer to the queue. Only the interrupt handler is allowed to do
225 * this, unless interrupts are disabled.
226 *
227 * Note: we don't check for a full queue, since there aren't enough buffers
228 * to more than fill it.
229 */
230 static void release_arcbuf(struct net_device *dev, int bufnum)
231 {
232 struct arcnet_local *lp = netdev_priv(dev);
233 int i;
234
235 lp->buf_queue[lp->first_free_buf++] = bufnum;
236 lp->first_free_buf %= 5;
237
238 BUGLVL(D_DURING) {
239 BUGMSG(D_DURING, "release_arcbuf: freed #%d; buffer queue is now: ",
240 bufnum);
241 for (i = lp->next_buf; i != lp->first_free_buf; i = (i + 1) % 5)
242 BUGMSG2(D_DURING, "#%d ", lp->buf_queue[i]);
243 BUGMSG2(D_DURING, "\n");
244 }
245 }
246
247 /* Get a buffer from the queue.
248 * If this returns -1, there are no buffers available.
249 */
250 static int get_arcbuf(struct net_device *dev)
251 {
252 struct arcnet_local *lp = netdev_priv(dev);
253 int buf = -1, i;
254
255 if (!atomic_dec_and_test(&lp->buf_lock)) {
256 /* already in this function */
257 BUGMSG(D_NORMAL, "get_arcbuf: overlap (%d)!\n",
258 lp->buf_lock.counter);
259 } else { /* we can continue */
260 if (lp->next_buf >= 5)
261 lp->next_buf -= 5;
262
263 if (lp->next_buf == lp->first_free_buf) {
264 BUGMSG(D_NORMAL, "get_arcbuf: BUG: no buffers are available??\n");
265 } else {
266 buf = lp->buf_queue[lp->next_buf++];
267 lp->next_buf %= 5;
268 }
269 }
270
271 BUGLVL(D_DURING) {
272 BUGMSG(D_DURING, "get_arcbuf: got #%d; buffer queue is now: ", buf);
273 for (i = lp->next_buf; i != lp->first_free_buf; i = (i + 1) % 5)
274 BUGMSG2(D_DURING, "#%d ", lp->buf_queue[i]);
275 BUGMSG2(D_DURING, "\n");
276 }
277
278 atomic_inc(&lp->buf_lock);
279 return buf;
280 }
281
282 static int choose_mtu(void)
283 {
284 int count, mtu = 65535;
285
286 /* choose the smallest MTU of all available encaps */
287 for (count = 0; count < 256; count++) {
288 if (arc_proto_map[count] != &arc_proto_null &&
289 arc_proto_map[count]->mtu < mtu) {
290 mtu = arc_proto_map[count]->mtu;
291 }
292 }
293
294 return mtu == 65535 ? XMTU : mtu;
295 }
296
297 static const struct header_ops arcnet_header_ops = {
298 .create = arcnet_header,
299 };
300
301 static const struct net_device_ops arcnet_netdev_ops = {
302 .ndo_open = arcnet_open,
303 .ndo_stop = arcnet_close,
304 .ndo_start_xmit = arcnet_send_packet,
305 .ndo_tx_timeout = arcnet_timeout,
306 };
307
308 /* Setup a struct device for ARCnet. */
309 static void arcdev_setup(struct net_device *dev)
310 {
311 dev->type = ARPHRD_ARCNET;
312 dev->netdev_ops = &arcnet_netdev_ops;
313 dev->header_ops = &arcnet_header_ops;
314 dev->hard_header_len = sizeof(struct archdr);
315 dev->mtu = choose_mtu();
316
317 dev->addr_len = ARCNET_ALEN;
318 dev->tx_queue_len = 100;
319 dev->broadcast[0] = 0x00; /* for us, broadcasts are address 0 */
320 dev->watchdog_timeo = TX_TIMEOUT;
321
322 /* New-style flags. */
323 dev->flags = IFF_BROADCAST;
324 }
325
326 struct net_device *alloc_arcdev(const char *name)
327 {
328 struct net_device *dev;
329
330 dev = alloc_netdev(sizeof(struct arcnet_local),
331 name && *name ? name : "arc%d", NET_NAME_UNKNOWN,
332 arcdev_setup);
333 if (dev) {
334 struct arcnet_local *lp = netdev_priv(dev);
335
336 spin_lock_init(&lp->lock);
337 }
338
339 return dev;
340 }
341
342 /* Open/initialize the board. This is called sometime after booting when
343 * the 'ifconfig' program is run.
344 *
345 * This routine should set everything up anew at each open, even registers
346 * that "should" only need to be set once at boot, so that there is
347 * non-reboot way to recover if something goes wrong.
348 */
349 int arcnet_open(struct net_device *dev)
350 {
351 struct arcnet_local *lp = netdev_priv(dev);
352 int count, newmtu, error;
353
354 BUGMSG(D_INIT, "opened.");
355
356 if (!try_module_get(lp->hw.owner))
357 return -ENODEV;
358
359 BUGLVL(D_PROTO) {
360 BUGMSG(D_PROTO, "protocol map (default is '%c'): ",
361 arc_proto_default->suffix);
362 for (count = 0; count < 256; count++)
363 BUGMSG2(D_PROTO, "%c", arc_proto_map[count]->suffix);
364 BUGMSG2(D_PROTO, "\n");
365 }
366
367 BUGMSG(D_INIT, "arcnet_open: resetting card.\n");
368
369 /* try to put the card in a defined state - if it fails the first
370 * time, actually reset it.
371 */
372 error = -ENODEV;
373 if (ARCRESET(0) && ARCRESET(1))
374 goto out_module_put;
375
376 newmtu = choose_mtu();
377 if (newmtu < dev->mtu)
378 dev->mtu = newmtu;
379
380 BUGMSG(D_INIT, "arcnet_open: mtu: %d.\n", dev->mtu);
381
382 /* autodetect the encapsulation for each host. */
383 memset(lp->default_proto, 0, sizeof(lp->default_proto));
384
385 /* the broadcast address is special - use the 'bcast' protocol */
386 for (count = 0; count < 256; count++) {
387 if (arc_proto_map[count] == arc_bcast_proto) {
388 lp->default_proto[0] = count;
389 break;
390 }
391 }
392
393 /* initialize buffers */
394 atomic_set(&lp->buf_lock, 1);
395
396 lp->next_buf = lp->first_free_buf = 0;
397 release_arcbuf(dev, 0);
398 release_arcbuf(dev, 1);
399 release_arcbuf(dev, 2);
400 release_arcbuf(dev, 3);
401 lp->cur_tx = lp->next_tx = -1;
402 lp->cur_rx = -1;
403
404 lp->rfc1201.sequence = 1;
405
406 /* bring up the hardware driver */
407 if (lp->hw.open)
408 lp->hw.open(dev);
409
410 if (dev->dev_addr[0] == 0)
411 BUGMSG(D_NORMAL, "WARNING! Station address 00 is reserved for broadcasts!\n");
412 else if (dev->dev_addr[0] == 255)
413 BUGMSG(D_NORMAL, "WARNING! Station address FF may confuse DOS networking programs!\n");
414
415 BUGMSG(D_DEBUG, "%s: %d: %s\n", __FILE__, __LINE__, __func__);
416 if (ASTATUS() & RESETflag) {
417 BUGMSG(D_DEBUG, "%s: %d: %s\n", __FILE__, __LINE__, __func__);
418 ACOMMAND(CFLAGScmd | RESETclear);
419 }
420
421 BUGMSG(D_DEBUG, "%s: %d: %s\n", __FILE__, __LINE__, __func__);
422 /* make sure we're ready to receive IRQ's. */
423 AINTMASK(0);
424 udelay(1); /* give it time to set the mask before
425 * we reset it again. (may not even be
426 * necessary)
427 */
428 BUGMSG(D_DEBUG, "%s: %d: %s\n", __FILE__, __LINE__, __func__);
429 lp->intmask = NORXflag | RECONflag;
430 AINTMASK(lp->intmask);
431 BUGMSG(D_DEBUG, "%s: %d: %s\n", __FILE__, __LINE__, __func__);
432
433 netif_start_queue(dev);
434
435 return 0;
436
437 out_module_put:
438 module_put(lp->hw.owner);
439 return error;
440 }
441
442 /* The inverse routine to arcnet_open - shuts down the card. */
443 int arcnet_close(struct net_device *dev)
444 {
445 struct arcnet_local *lp = netdev_priv(dev);
446
447 netif_stop_queue(dev);
448
449 /* flush TX and disable RX */
450 AINTMASK(0);
451 ACOMMAND(NOTXcmd); /* stop transmit */
452 ACOMMAND(NORXcmd); /* disable receive */
453 mdelay(1);
454
455 /* shut down the card */
456 lp->hw.close(dev);
457 module_put(lp->hw.owner);
458 return 0;
459 }
460
461 static int arcnet_header(struct sk_buff *skb, struct net_device *dev,
462 unsigned short type, const void *daddr,
463 const void *saddr, unsigned len)
464 {
465 const struct arcnet_local *lp = netdev_priv(dev);
466 uint8_t _daddr, proto_num;
467 struct ArcProto *proto;
468
469 BUGMSG(D_DURING,
470 "create header from %d to %d; protocol %d (%Xh); size %u.\n",
471 saddr ? *(uint8_t *)saddr : -1,
472 daddr ? *(uint8_t *)daddr : -1,
473 type, type, len);
474
475 if (skb->len != 0 && len != skb->len)
476 BUGMSG(D_NORMAL, "arcnet_header: Yikes! skb->len(%d) != len(%d)!\n",
477 skb->len, len);
478
479 /* Type is host order - ? */
480 if (type == ETH_P_ARCNET) {
481 proto = arc_raw_proto;
482 BUGMSG(D_DEBUG, "arc_raw_proto used. proto='%c'\n", proto->suffix);
483 _daddr = daddr ? *(uint8_t *)daddr : 0;
484 } else if (!daddr) {
485 /* if the dest addr isn't provided, we can't choose an
486 * encapsulation! Store the packet type (eg. ETH_P_IP)
487 * for now, and we'll push on a real header when we do
488 * rebuild_header.
489 */
490 *(uint16_t *)skb_push(skb, 2) = type;
491 /* XXX: Why not use skb->mac_len? */
492 if (skb->network_header - skb->mac_header != 2)
493 BUGMSG(D_NORMAL, "arcnet_header: Yikes! diff (%d) is not 2!\n",
494 (int)(skb->network_header - skb->mac_header));
495 return -2; /* return error -- can't transmit yet! */
496 } else {
497 /* otherwise, we can just add the header as usual. */
498 _daddr = *(uint8_t *)daddr;
499 proto_num = lp->default_proto[_daddr];
500 proto = arc_proto_map[proto_num];
501 BUGMSG(D_DURING, "building header for %02Xh using protocol '%c'\n",
502 proto_num, proto->suffix);
503 if (proto == &arc_proto_null && arc_bcast_proto != proto) {
504 BUGMSG(D_DURING, "actually, let's use '%c' instead.\n",
505 arc_bcast_proto->suffix);
506 proto = arc_bcast_proto;
507 }
508 }
509 return proto->build_header(skb, dev, type, _daddr);
510 }
511
512 /* Called by the kernel in order to transmit a packet. */
513 netdev_tx_t arcnet_send_packet(struct sk_buff *skb,
514 struct net_device *dev)
515 {
516 struct arcnet_local *lp = netdev_priv(dev);
517 struct archdr *pkt;
518 struct arc_rfc1201 *soft;
519 struct ArcProto *proto;
520 int txbuf;
521 unsigned long flags;
522 int freeskb, retval;
523
524 BUGMSG(D_DURING,
525 "transmit requested (status=%Xh, txbufs=%d/%d, len=%d, protocol %x)\n",
526 ASTATUS(), lp->cur_tx, lp->next_tx, skb->len, skb->protocol);
527
528 pkt = (struct archdr *)skb->data;
529 soft = &pkt->soft.rfc1201;
530 proto = arc_proto_map[soft->proto];
531
532 BUGMSG(D_SKB_SIZE, "skb: transmitting %d bytes to %02X\n",
533 skb->len, pkt->hard.dest);
534 BUGLVL(D_SKB) arcnet_dump_skb(dev, skb, "tx");
535
536 /* fits in one packet? */
537 if (skb->len - ARC_HDR_SIZE > XMTU && !proto->continue_tx) {
538 BUGMSG(D_NORMAL, "fixme: packet too large: compensating badly!\n");
539 dev_kfree_skb(skb);
540 return NETDEV_TX_OK; /* don't try again */
541 }
542
543 /* We're busy transmitting a packet... */
544 netif_stop_queue(dev);
545
546 spin_lock_irqsave(&lp->lock, flags);
547 AINTMASK(0);
548 if (lp->next_tx == -1)
549 txbuf = get_arcbuf(dev);
550 else
551 txbuf = -1;
552
553 if (txbuf != -1) {
554 if (proto->prepare_tx(dev, pkt, skb->len, txbuf) &&
555 !proto->ack_tx) {
556 /* done right away and we don't want to acknowledge
557 * the package later - forget about it now
558 */
559 dev->stats.tx_bytes += skb->len;
560 freeskb = 1;
561 } else {
562 /* do it the 'split' way */
563 lp->outgoing.proto = proto;
564 lp->outgoing.skb = skb;
565 lp->outgoing.pkt = pkt;
566
567 freeskb = 0;
568
569 if (proto->continue_tx &&
570 proto->continue_tx(dev, txbuf)) {
571 BUGMSG(D_NORMAL,
572 "bug! continue_tx finished the first time! (proto='%c')\n",
573 proto->suffix);
574 }
575 }
576 retval = NETDEV_TX_OK;
577 lp->next_tx = txbuf;
578 } else {
579 retval = NETDEV_TX_BUSY;
580 freeskb = 0;
581 }
582
583 BUGMSG(D_DEBUG, "%s: %d: %s, status: %x\n", __FILE__, __LINE__, __func__, ASTATUS());
584 /* make sure we didn't ignore a TX IRQ while we were in here */
585 AINTMASK(0);
586
587 BUGMSG(D_DEBUG, "%s: %d: %s\n", __FILE__, __LINE__, __func__);
588 lp->intmask |= TXFREEflag | EXCNAKflag;
589 AINTMASK(lp->intmask);
590 BUGMSG(D_DEBUG, "%s: %d: %s, status: %x\n", __FILE__, __LINE__, __func__, ASTATUS());
591
592 spin_unlock_irqrestore(&lp->lock, flags);
593 if (freeskb)
594 dev_kfree_skb(skb);
595
596 return retval; /* no need to try again */
597 }
598
599 /* Actually start transmitting a packet that was loaded into a buffer
600 * by prepare_tx. This should _only_ be called by the interrupt handler.
601 */
602 static int go_tx(struct net_device *dev)
603 {
604 struct arcnet_local *lp = netdev_priv(dev);
605
606 BUGMSG(D_DURING, "go_tx: status=%Xh, intmask=%Xh, next_tx=%d, cur_tx=%d\n",
607 ASTATUS(), lp->intmask, lp->next_tx, lp->cur_tx);
608
609 if (lp->cur_tx != -1 || lp->next_tx == -1)
610 return 0;
611
612 BUGLVL(D_TX) arcnet_dump_packet(dev, lp->next_tx, "go_tx", 0);
613
614 lp->cur_tx = lp->next_tx;
615 lp->next_tx = -1;
616
617 /* start sending */
618 ACOMMAND(TXcmd | (lp->cur_tx << 3));
619
620 dev->stats.tx_packets++;
621 lp->lasttrans_dest = lp->lastload_dest;
622 lp->lastload_dest = 0;
623 lp->excnak_pending = 0;
624 lp->intmask |= TXFREEflag | EXCNAKflag;
625
626 return 1;
627 }
628
629 /* Called by the kernel when transmit times out */
630 void arcnet_timeout(struct net_device *dev)
631 {
632 unsigned long flags;
633 struct arcnet_local *lp = netdev_priv(dev);
634 int status = ASTATUS();
635 char *msg;
636
637 spin_lock_irqsave(&lp->lock, flags);
638 if (status & TXFREEflag) { /* transmit _DID_ finish */
639 msg = " - missed IRQ?";
640 } else {
641 msg = "";
642 dev->stats.tx_aborted_errors++;
643 lp->timed_out = 1;
644 ACOMMAND(NOTXcmd | (lp->cur_tx << 3));
645 }
646 dev->stats.tx_errors++;
647
648 /* make sure we didn't miss a TX or a EXC NAK IRQ */
649 AINTMASK(0);
650 lp->intmask |= TXFREEflag | EXCNAKflag;
651 AINTMASK(lp->intmask);
652
653 spin_unlock_irqrestore(&lp->lock, flags);
654
655 if (time_after(jiffies, lp->last_timeout + 10 * HZ)) {
656 BUGMSG(D_EXTRA, "tx timed out%s (status=%Xh, intmask=%Xh, dest=%02Xh)\n",
657 msg, status, lp->intmask, lp->lasttrans_dest);
658 lp->last_timeout = jiffies;
659 }
660
661 if (lp->cur_tx == -1)
662 netif_wake_queue(dev);
663 }
664
665 /* The typical workload of the driver: Handle the network interface
666 * interrupts. Establish which device needs attention, and call the correct
667 * chipset interrupt handler.
668 */
669 irqreturn_t arcnet_interrupt(int irq, void *dev_id)
670 {
671 struct net_device *dev = dev_id;
672 struct arcnet_local *lp;
673 int recbuf, status, diagstatus, didsomething, boguscount;
674 int retval = IRQ_NONE;
675
676 BUGMSG(D_DURING, "\n");
677
678 BUGMSG(D_DURING, "in arcnet_interrupt\n");
679
680 lp = netdev_priv(dev);
681 BUG_ON(!lp);
682
683 spin_lock(&lp->lock);
684
685 /* RESET flag was enabled - if device is not running, we must
686 * clear it right away (but nothing else).
687 */
688 if (!netif_running(dev)) {
689 if (ASTATUS() & RESETflag)
690 ACOMMAND(CFLAGScmd | RESETclear);
691 AINTMASK(0);
692 spin_unlock(&lp->lock);
693 return retval;
694 }
695
696 BUGMSG(D_DURING, "in arcnet_inthandler (status=%Xh, intmask=%Xh)\n",
697 ASTATUS(), lp->intmask);
698
699 boguscount = 5;
700 do {
701 status = ASTATUS();
702 diagstatus = (status >> 8) & 0xFF;
703
704 BUGMSG(D_DEBUG, "%s: %d: %s: status=%x\n",
705 __FILE__, __LINE__, __func__, status);
706 didsomething = 0;
707
708 /* RESET flag was enabled - card is resetting and if RX is
709 * disabled, it's NOT because we just got a packet.
710 *
711 * The card is in an undefined state.
712 * Clear it out and start over.
713 */
714 if (status & RESETflag) {
715 BUGMSG(D_NORMAL, "spurious reset (status=%Xh)\n", status);
716 arcnet_close(dev);
717 arcnet_open(dev);
718
719 /* get out of the interrupt handler! */
720 break;
721 }
722 /* RX is inhibited - we must have received something.
723 * Prepare to receive into the next buffer.
724 *
725 * We don't actually copy the received packet from the card
726 * until after the transmit handler runs (and possibly
727 * launches the next tx); this should improve latency slightly
728 * if we get both types of interrupts at once.
729 */
730 recbuf = -1;
731 if (status & lp->intmask & NORXflag) {
732 recbuf = lp->cur_rx;
733 BUGMSG(D_DURING, "Buffer #%d: receive irq (status=%Xh)\n",
734 recbuf, status);
735
736 lp->cur_rx = get_arcbuf(dev);
737 if (lp->cur_rx != -1) {
738 BUGMSG(D_DURING, "enabling receive to buffer #%d\n",
739 lp->cur_rx);
740 ACOMMAND(RXcmd | (lp->cur_rx << 3) | RXbcasts);
741 }
742 didsomething++;
743 }
744
745 if ((diagstatus & EXCNAKflag)) {
746 BUGMSG(D_DURING, "EXCNAK IRQ (diagstat=%Xh)\n",
747 diagstatus);
748
749 ACOMMAND(NOTXcmd); /* disable transmit */
750 lp->excnak_pending = 1;
751
752 ACOMMAND(EXCNAKclear);
753 lp->intmask &= ~(EXCNAKflag);
754 didsomething++;
755 }
756
757 /* a transmit finished, and we're interested in it. */
758 if ((status & lp->intmask & TXFREEflag) || lp->timed_out) {
759 lp->intmask &= ~(TXFREEflag | EXCNAKflag);
760
761 BUGMSG(D_DURING, "TX IRQ (stat=%Xh)\n", status);
762
763 if (lp->cur_tx != -1 && !lp->timed_out) {
764 if (!(status & TXACKflag)) {
765 if (lp->lasttrans_dest != 0) {
766 BUGMSG(D_EXTRA,
767 "transmit was not acknowledged! (status=%Xh, dest=%02Xh)\n",
768 status, lp->lasttrans_dest);
769 dev->stats.tx_errors++;
770 dev->stats.tx_carrier_errors++;
771 } else {
772 BUGMSG(D_DURING,
773 "broadcast was not acknowledged; that's normal (status=%Xh, dest=%02Xh)\n",
774 status, lp->lasttrans_dest);
775 }
776 }
777
778 if (lp->outgoing.proto &&
779 lp->outgoing.proto->ack_tx) {
780 int ackstatus;
781
782 if (status & TXACKflag)
783 ackstatus = 2;
784 else if (lp->excnak_pending)
785 ackstatus = 1;
786 else
787 ackstatus = 0;
788
789 lp->outgoing.proto
790 ->ack_tx(dev, ackstatus);
791 }
792 }
793 if (lp->cur_tx != -1)
794 release_arcbuf(dev, lp->cur_tx);
795
796 lp->cur_tx = -1;
797 lp->timed_out = 0;
798 didsomething++;
799
800 /* send another packet if there is one */
801 go_tx(dev);
802
803 /* continue a split packet, if any */
804 if (lp->outgoing.proto && lp->outgoing.proto->continue_tx) {
805 int txbuf = get_arcbuf(dev);
806
807 if (txbuf != -1) {
808 if (lp->outgoing.proto->continue_tx(dev, txbuf)) {
809 /* that was the last segment */
810 dev->stats.tx_bytes += lp->outgoing.skb->len;
811 if (!lp->outgoing.proto->ack_tx) {
812 dev_kfree_skb_irq(lp->outgoing.skb);
813 lp->outgoing.proto = NULL;
814 }
815 }
816 lp->next_tx = txbuf;
817 }
818 }
819 /* inform upper layers of idleness, if necessary */
820 if (lp->cur_tx == -1)
821 netif_wake_queue(dev);
822 }
823 /* now process the received packet, if any */
824 if (recbuf != -1) {
825 BUGLVL(D_RX) arcnet_dump_packet(dev, recbuf, "rx irq", 0);
826
827 arcnet_rx(dev, recbuf);
828 release_arcbuf(dev, recbuf);
829
830 didsomething++;
831 }
832 if (status & lp->intmask & RECONflag) {
833 ACOMMAND(CFLAGScmd | CONFIGclear);
834 dev->stats.tx_carrier_errors++;
835
836 BUGMSG(D_RECON, "Network reconfiguration detected (status=%Xh)\n",
837 status);
838 /* MYRECON bit is at bit 7 of diagstatus */
839 if (diagstatus & 0x80)
840 BUGMSG(D_RECON, "Put out that recon myself\n");
841
842 /* is the RECON info empty or old? */
843 if (!lp->first_recon || !lp->last_recon ||
844 time_after(jiffies, lp->last_recon + HZ * 10)) {
845 if (lp->network_down)
846 BUGMSG(D_NORMAL, "reconfiguration detected: cabling restored?\n");
847 lp->first_recon = lp->last_recon = jiffies;
848 lp->num_recons = lp->network_down = 0;
849
850 BUGMSG(D_DURING, "recon: clearing counters.\n");
851 } else { /* add to current RECON counter */
852 lp->last_recon = jiffies;
853 lp->num_recons++;
854
855 BUGMSG(D_DURING, "recon: counter=%d, time=%lds, net=%d\n",
856 lp->num_recons,
857 (lp->last_recon - lp->first_recon) / HZ,
858 lp->network_down);
859
860 /* if network is marked up;
861 * and first_recon and last_recon are 60+ apart;
862 * and the average no. of recons counted is
863 * > RECON_THRESHOLD/min;
864 * then print a warning message.
865 */
866 if (!lp->network_down &&
867 (lp->last_recon - lp->first_recon) <= HZ * 60 &&
868 lp->num_recons >= RECON_THRESHOLD) {
869 lp->network_down = 1;
870 BUGMSG(D_NORMAL, "many reconfigurations detected: cabling problem?\n");
871 } else if (!lp->network_down &&
872 lp->last_recon - lp->first_recon > HZ * 60) {
873 /* reset counters if we've gone for over a minute. */
874 lp->first_recon = lp->last_recon;
875 lp->num_recons = 1;
876 }
877 }
878 } else if (lp->network_down &&
879 time_after(jiffies, lp->last_recon + HZ * 10)) {
880 if (lp->network_down)
881 BUGMSG(D_NORMAL, "cabling restored?\n");
882 lp->first_recon = lp->last_recon = 0;
883 lp->num_recons = lp->network_down = 0;
884
885 BUGMSG(D_DURING, "not recon: clearing counters anyway.\n");
886 }
887
888 if (didsomething)
889 retval |= IRQ_HANDLED;
890 } while (--boguscount && didsomething);
891
892 BUGMSG(D_DURING, "arcnet_interrupt complete (status=%Xh, count=%d)\n",
893 ASTATUS(), boguscount);
894 BUGMSG(D_DURING, "\n");
895
896 AINTMASK(0);
897 udelay(1);
898 AINTMASK(lp->intmask);
899
900 spin_unlock(&lp->lock);
901 return retval;
902 }
903
904 /* This is a generic packet receiver that calls arcnet??_rx depending on the
905 * protocol ID found.
906 */
907 static void arcnet_rx(struct net_device *dev, int bufnum)
908 {
909 struct arcnet_local *lp = netdev_priv(dev);
910 struct archdr pkt;
911 struct arc_rfc1201 *soft;
912 int length, ofs;
913
914 soft = &pkt.soft.rfc1201;
915
916 lp->hw.copy_from_card(dev, bufnum, 0, &pkt, ARC_HDR_SIZE);
917 if (pkt.hard.offset[0]) {
918 ofs = pkt.hard.offset[0];
919 length = 256 - ofs;
920 } else {
921 ofs = pkt.hard.offset[1];
922 length = 512 - ofs;
923 }
924
925 /* get the full header, if possible */
926 if (sizeof(pkt.soft) <= length) {
927 lp->hw.copy_from_card(dev, bufnum, ofs, soft, sizeof(pkt.soft));
928 } else {
929 memset(&pkt.soft, 0, sizeof(pkt.soft));
930 lp->hw.copy_from_card(dev, bufnum, ofs, soft, length);
931 }
932
933 BUGMSG(D_DURING, "Buffer #%d: received packet from %02Xh to %02Xh (%d+4 bytes)\n",
934 bufnum, pkt.hard.source, pkt.hard.dest, length);
935
936 dev->stats.rx_packets++;
937 dev->stats.rx_bytes += length + ARC_HDR_SIZE;
938
939 /* call the right receiver for the protocol */
940 if (arc_proto_map[soft->proto]->is_ip) {
941 BUGLVL(D_PROTO) {
942 struct ArcProto
943 *oldp = arc_proto_map[lp->default_proto[pkt.hard.source]],
944 *newp = arc_proto_map[soft->proto];
945
946 if (oldp != newp) {
947 BUGMSG(D_PROTO,
948 "got protocol %02Xh; encap for host %02Xh is now '%c' (was '%c')\n",
949 soft->proto, pkt.hard.source,
950 newp->suffix, oldp->suffix);
951 }
952 }
953
954 /* broadcasts will always be done with the last-used encap. */
955 lp->default_proto[0] = soft->proto;
956
957 /* in striking contrast, the following isn't a hack. */
958 lp->default_proto[pkt.hard.source] = soft->proto;
959 }
960 /* call the protocol-specific receiver. */
961 arc_proto_map[soft->proto]->rx(dev, bufnum, &pkt, length);
962 }
963
964 static void null_rx(struct net_device *dev, int bufnum,
965 struct archdr *pkthdr, int length)
966 {
967 BUGMSG(D_PROTO,
968 "rx: don't know how to deal with proto %02Xh from host %02Xh.\n",
969 pkthdr->soft.rfc1201.proto, pkthdr->hard.source);
970 }
971
972 static int null_build_header(struct sk_buff *skb, struct net_device *dev,
973 unsigned short type, uint8_t daddr)
974 {
975 struct arcnet_local *lp = netdev_priv(dev);
976
977 BUGMSG(D_PROTO,
978 "tx: can't build header for encap %02Xh; load a protocol driver.\n",
979 lp->default_proto[daddr]);
980
981 /* always fails */
982 return 0;
983 }
984
985 /* the "do nothing" prepare_tx function warns that there's nothing to do. */
986 static int null_prepare_tx(struct net_device *dev, struct archdr *pkt,
987 int length, int bufnum)
988 {
989 struct arcnet_local *lp = netdev_priv(dev);
990 struct arc_hardware newpkt;
991
992 BUGMSG(D_PROTO, "tx: no encap for this host; load a protocol driver.\n");
993
994 /* send a packet to myself -- will never get received, of course */
995 newpkt.source = newpkt.dest = dev->dev_addr[0];
996
997 /* only one byte of actual data (and it's random) */
998 newpkt.offset[0] = 0xFF;
999
1000 lp->hw.copy_to_card(dev, bufnum, 0, &newpkt, ARC_HDR_SIZE);
1001
1002 return 1; /* done */
1003 }
Linux kernel - Deliverables
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