blob: d8f029303754a76c4feae384986b2b6efbc21ca1 [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);
Stephen Hemmingerbca5b892009-01-09 13:01:09 +000098EXPORT_SYMBOL(arcnet_open);
99EXPORT_SYMBOL(arcnet_close);
100EXPORT_SYMBOL(arcnet_send_packet);
101EXPORT_SYMBOL(arcnet_timeout);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700102
103/* Internal function prototypes */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700104static 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);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700108static int go_tx(struct net_device *dev);
109
110static int debug = ARCNET_DEBUG;
111module_param(debug, int, 0);
112MODULE_LICENSE("GPL");
113
114static int __init arcnet_init(void)
115{
116 int count;
117
118 arcnet_debug = debug;
119
Adrian Bunkf03aa2d2006-01-14 03:10:22 +0100120 printk("arcnet loaded.\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700121
122#ifdef ALPHA_WARNING
123 BUGLVL(D_EXTRA) {
124 printk("arcnet: ***\n"
125 "arcnet: * Read arcnet.txt for important release notes!\n"
126 "arcnet: *\n"
127 "arcnet: * This is an ALPHA version! (Last stable release: v3.02) E-mail\n"
128 "arcnet: * me if you have any questions, comments, or bug reports.\n"
129 "arcnet: ***\n");
130 }
131#endif
132
133 /* initialize the protocol map */
134 arc_raw_proto = arc_proto_default = arc_bcast_proto = &arc_proto_null;
135 for (count = 0; count < 256; count++)
136 arc_proto_map[count] = arc_proto_default;
137
138 BUGLVL(D_DURING)
139 printk("arcnet: struct sizes: %Zd %Zd %Zd %Zd %Zd\n",
140 sizeof(struct arc_hardware), sizeof(struct arc_rfc1201),
141 sizeof(struct arc_rfc1051), sizeof(struct arc_eth_encap),
142 sizeof(struct archdr));
143
144 return 0;
145}
146
147static void __exit arcnet_exit(void)
148{
149}
150
151module_init(arcnet_init);
152module_exit(arcnet_exit);
153
154/*
155 * Dump the contents of an sk_buff
156 */
157#if ARCNET_DEBUG_MAX & D_SKB
158void arcnet_dump_skb(struct net_device *dev,
159 struct sk_buff *skb, char *desc)
160{
Joe Perchesad361c92009-07-06 13:05:40 -0700161 char hdr[32];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700162
Joe Perchesad361c92009-07-06 13:05:40 -0700163 /* dump the packet */
164 snprintf(hdr, sizeof(hdr), "%6s:%s skb->data:", dev->name, desc);
165 print_hex_dump(KERN_DEBUG, hdr, DUMP_PREFIX_OFFSET,
166 16, 1, skb->data, skb->len, true);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700167}
168
169EXPORT_SYMBOL(arcnet_dump_skb);
170#endif
171
172
173/*
174 * Dump the contents of an ARCnet buffer
175 */
176#if (ARCNET_DEBUG_MAX & (D_RX | D_TX))
Adrian Bunkf03aa2d2006-01-14 03:10:22 +0100177static void arcnet_dump_packet(struct net_device *dev, int bufnum,
178 char *desc, int take_arcnet_lock)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700179{
Wang Chen454d7c92008-11-12 23:37:49 -0800180 struct arcnet_local *lp = netdev_priv(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700181 int i, length;
182 unsigned long flags = 0;
183 static uint8_t buf[512];
Joe Perchesad361c92009-07-06 13:05:40 -0700184 char hdr[32];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700185
186 /* hw.copy_from_card expects IRQ context so take the IRQ lock
187 to keep it single threaded */
188 if(take_arcnet_lock)
189 spin_lock_irqsave(&lp->lock, flags);
190
191 lp->hw.copy_from_card(dev, bufnum, 0, buf, 512);
192 if(take_arcnet_lock)
193 spin_unlock_irqrestore(&lp->lock, flags);
194
195 /* if the offset[0] byte is nonzero, this is a 256-byte packet */
196 length = (buf[2] ? 256 : 512);
197
Joe Perchesad361c92009-07-06 13:05:40 -0700198 /* dump the packet */
199 snprintf(hdr, sizeof(hdr), "%6s:%s packet dump:", dev->name, desc);
200 print_hex_dump(KERN_DEBUG, hdr, DUMP_PREFIX_OFFSET,
201 16, 1, buf, length, true);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700202}
203
Adrian Bunkf03aa2d2006-01-14 03:10:22 +0100204#else
205
206#define arcnet_dump_packet(dev, bufnum, desc,take_arcnet_lock) do { } while (0)
207
Linus Torvalds1da177e2005-04-16 15:20:36 -0700208#endif
209
210
211/*
212 * Unregister a protocol driver from the arc_proto_map. Protocol drivers
213 * are responsible for registering themselves, but the unregister routine
214 * is pretty generic so we'll do it here.
215 */
216void arcnet_unregister_proto(struct ArcProto *proto)
217{
218 int count;
219
220 if (arc_proto_default == proto)
221 arc_proto_default = &arc_proto_null;
222 if (arc_bcast_proto == proto)
223 arc_bcast_proto = arc_proto_default;
224 if (arc_raw_proto == proto)
225 arc_raw_proto = arc_proto_default;
226
227 for (count = 0; count < 256; count++) {
228 if (arc_proto_map[count] == proto)
229 arc_proto_map[count] = arc_proto_default;
230 }
231}
232
233
234/*
235 * Add a buffer to the queue. Only the interrupt handler is allowed to do
236 * this, unless interrupts are disabled.
237 *
238 * Note: we don't check for a full queue, since there aren't enough buffers
239 * to more than fill it.
240 */
241static void release_arcbuf(struct net_device *dev, int bufnum)
242{
Wang Chen454d7c92008-11-12 23:37:49 -0800243 struct arcnet_local *lp = netdev_priv(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700244 int i;
245
246 lp->buf_queue[lp->first_free_buf++] = bufnum;
247 lp->first_free_buf %= 5;
248
249 BUGLVL(D_DURING) {
250 BUGMSG(D_DURING, "release_arcbuf: freed #%d; buffer queue is now: ",
251 bufnum);
252 for (i = lp->next_buf; i != lp->first_free_buf; i = (i+1) % 5)
253 BUGMSG2(D_DURING, "#%d ", lp->buf_queue[i]);
254 BUGMSG2(D_DURING, "\n");
255 }
256}
257
258
259/*
260 * Get a buffer from the queue. If this returns -1, there are no buffers
261 * available.
262 */
263static int get_arcbuf(struct net_device *dev)
264{
Wang Chen454d7c92008-11-12 23:37:49 -0800265 struct arcnet_local *lp = netdev_priv(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700266 int buf = -1, i;
267
268 if (!atomic_dec_and_test(&lp->buf_lock)) {
269 /* already in this function */
270 BUGMSG(D_NORMAL, "get_arcbuf: overlap (%d)!\n",
271 lp->buf_lock.counter);
272 }
273 else { /* we can continue */
274 if (lp->next_buf >= 5)
275 lp->next_buf -= 5;
276
277 if (lp->next_buf == lp->first_free_buf)
278 BUGMSG(D_NORMAL, "get_arcbuf: BUG: no buffers are available??\n");
279 else {
280 buf = lp->buf_queue[lp->next_buf++];
281 lp->next_buf %= 5;
282 }
283 }
284
285
286 BUGLVL(D_DURING) {
287 BUGMSG(D_DURING, "get_arcbuf: got #%d; buffer queue is now: ", buf);
288 for (i = lp->next_buf; i != lp->first_free_buf; i = (i+1) % 5)
289 BUGMSG2(D_DURING, "#%d ", lp->buf_queue[i]);
290 BUGMSG2(D_DURING, "\n");
291 }
292
293 atomic_inc(&lp->buf_lock);
294 return buf;
295}
296
297
298static int choose_mtu(void)
299{
300 int count, mtu = 65535;
301
302 /* choose the smallest MTU of all available encaps */
303 for (count = 0; count < 256; count++) {
Joe Perches8e95a202009-12-03 07:58:21 +0000304 if (arc_proto_map[count] != &arc_proto_null &&
305 arc_proto_map[count]->mtu < mtu) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700306 mtu = arc_proto_map[count]->mtu;
307 }
308 }
309
310 return mtu == 65535 ? XMTU : mtu;
311}
312
Stephen Hemminger3b04ddd2007-10-09 01:40:57 -0700313static const struct header_ops arcnet_header_ops = {
314 .create = arcnet_header,
315 .rebuild = arcnet_rebuild_header,
316};
317
Stephen Hemmingerbca5b892009-01-09 13:01:09 +0000318static const struct net_device_ops arcnet_netdev_ops = {
319 .ndo_open = arcnet_open,
320 .ndo_stop = arcnet_close,
321 .ndo_start_xmit = arcnet_send_packet,
322 .ndo_tx_timeout = arcnet_timeout,
323};
Linus Torvalds1da177e2005-04-16 15:20:36 -0700324
325/* Setup a struct device for ARCnet. */
326static void arcdev_setup(struct net_device *dev)
327{
328 dev->type = ARPHRD_ARCNET;
Stephen Hemmingerbca5b892009-01-09 13:01:09 +0000329 dev->netdev_ops = &arcnet_netdev_ops;
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
Linus Torvalds1da177e2005-04-16 15:20:36 -0700342}
343
Stephen Hemmingerbca5b892009-01-09 13:01:09 +0000344struct net_device *alloc_arcdev(const char *name)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700345{
346 struct net_device *dev;
347
348 dev = alloc_netdev(sizeof(struct arcnet_local),
349 name && *name ? name : "arc%d", arcdev_setup);
350 if(dev) {
Wang Chen454d7c92008-11-12 23:37:49 -0800351 struct arcnet_local *lp = netdev_priv(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700352 spin_lock_init(&lp->lock);
353 }
354
355 return dev;
356}
357
358/*
359 * Open/initialize the board. This is called sometime after booting when
360 * the 'ifconfig' program is run.
361 *
362 * This routine should set everything up anew at each open, even registers
363 * that "should" only need to be set once at boot, so that there is
364 * non-reboot way to recover if something goes wrong.
365 */
Stephen Hemmingerbca5b892009-01-09 13:01:09 +0000366int arcnet_open(struct net_device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700367{
Wang Chen454d7c92008-11-12 23:37:49 -0800368 struct arcnet_local *lp = netdev_priv(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700369 int count, newmtu, error;
370
371 BUGMSG(D_INIT,"opened.");
372
373 if (!try_module_get(lp->hw.owner))
374 return -ENODEV;
375
376 BUGLVL(D_PROTO) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700377 BUGMSG(D_PROTO, "protocol map (default is '%c'): ",
378 arc_proto_default->suffix);
379 for (count = 0; count < 256; count++)
380 BUGMSG2(D_PROTO, "%c", arc_proto_map[count]->suffix);
381 BUGMSG2(D_PROTO, "\n");
382 }
383
384
385 BUGMSG(D_INIT, "arcnet_open: resetting card.\n");
386
387 /* try to put the card in a defined state - if it fails the first
388 * time, actually reset it.
389 */
390 error = -ENODEV;
391 if (ARCRESET(0) && ARCRESET(1))
392 goto out_module_put;
393
394 newmtu = choose_mtu();
395 if (newmtu < dev->mtu)
396 dev->mtu = newmtu;
397
398 BUGMSG(D_INIT, "arcnet_open: mtu: %d.\n", dev->mtu);
399
400 /* autodetect the encapsulation for each host. */
401 memset(lp->default_proto, 0, sizeof(lp->default_proto));
402
403 /* the broadcast address is special - use the 'bcast' protocol */
404 for (count = 0; count < 256; count++) {
405 if (arc_proto_map[count] == arc_bcast_proto) {
406 lp->default_proto[0] = count;
407 break;
408 }
409 }
410
411 /* initialize buffers */
412 atomic_set(&lp->buf_lock, 1);
413
414 lp->next_buf = lp->first_free_buf = 0;
415 release_arcbuf(dev, 0);
416 release_arcbuf(dev, 1);
417 release_arcbuf(dev, 2);
418 release_arcbuf(dev, 3);
419 lp->cur_tx = lp->next_tx = -1;
420 lp->cur_rx = -1;
421
422 lp->rfc1201.sequence = 1;
423
424 /* bring up the hardware driver */
425 if (lp->hw.open)
426 lp->hw.open(dev);
427
428 if (dev->dev_addr[0] == 0)
429 BUGMSG(D_NORMAL, "WARNING! Station address 00 is reserved "
430 "for broadcasts!\n");
431 else if (dev->dev_addr[0] == 255)
432 BUGMSG(D_NORMAL, "WARNING! Station address FF may confuse "
433 "DOS networking programs!\n");
434
Harvey Harrisonb39d66a2008-08-20 16:52:04 -0700435 BUGMSG(D_DEBUG, "%s: %d: %s\n",__FILE__,__LINE__,__func__);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700436 if (ASTATUS() & RESETflag) {
Harvey Harrisonb39d66a2008-08-20 16:52:04 -0700437 BUGMSG(D_DEBUG, "%s: %d: %s\n",__FILE__,__LINE__,__func__);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700438 ACOMMAND(CFLAGScmd | RESETclear);
439 }
440
441
Harvey Harrisonb39d66a2008-08-20 16:52:04 -0700442 BUGMSG(D_DEBUG, "%s: %d: %s\n",__FILE__,__LINE__,__func__);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700443 /* make sure we're ready to receive IRQ's. */
444 AINTMASK(0);
445 udelay(1); /* give it time to set the mask before
446 * we reset it again. (may not even be
447 * necessary)
448 */
Harvey Harrisonb39d66a2008-08-20 16:52:04 -0700449 BUGMSG(D_DEBUG, "%s: %d: %s\n",__FILE__,__LINE__,__func__);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700450 lp->intmask = NORXflag | RECONflag;
451 AINTMASK(lp->intmask);
Harvey Harrisonb39d66a2008-08-20 16:52:04 -0700452 BUGMSG(D_DEBUG, "%s: %d: %s\n",__FILE__,__LINE__,__func__);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700453
454 netif_start_queue(dev);
455
456 return 0;
457
458 out_module_put:
459 module_put(lp->hw.owner);
460 return error;
461}
462
463
464/* The inverse routine to arcnet_open - shuts down the card. */
Stephen Hemmingerbca5b892009-01-09 13:01:09 +0000465int arcnet_close(struct net_device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700466{
Wang Chen454d7c92008-11-12 23:37:49 -0800467 struct arcnet_local *lp = netdev_priv(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700468
469 netif_stop_queue(dev);
470
471 /* flush TX and disable RX */
472 AINTMASK(0);
473 ACOMMAND(NOTXcmd); /* stop transmit */
474 ACOMMAND(NORXcmd); /* disable receive */
475 mdelay(1);
476
477 /* shut down the card */
478 lp->hw.close(dev);
479 module_put(lp->hw.owner);
480 return 0;
481}
482
483
484static int arcnet_header(struct sk_buff *skb, struct net_device *dev,
Stephen Hemminger3b04ddd2007-10-09 01:40:57 -0700485 unsigned short type, const void *daddr,
486 const void *saddr, unsigned len)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700487{
Stephen Hemminger3b04ddd2007-10-09 01:40:57 -0700488 const struct arcnet_local *lp = netdev_priv(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700489 uint8_t _daddr, proto_num;
490 struct ArcProto *proto;
491
492 BUGMSG(D_DURING,
493 "create header from %d to %d; protocol %d (%Xh); size %u.\n",
494 saddr ? *(uint8_t *) saddr : -1,
495 daddr ? *(uint8_t *) daddr : -1,
496 type, type, len);
497
498 if (skb->len!=0 && len != skb->len)
499 BUGMSG(D_NORMAL, "arcnet_header: Yikes! skb->len(%d) != len(%d)!\n",
500 skb->len, len);
501
502
503 /* Type is host order - ? */
504 if(type == ETH_P_ARCNET) {
505 proto = arc_raw_proto;
506 BUGMSG(D_DEBUG, "arc_raw_proto used. proto='%c'\n",proto->suffix);
507 _daddr = daddr ? *(uint8_t *) daddr : 0;
508 }
509 else if (!daddr) {
510 /*
511 * if the dest addr isn't provided, we can't choose an encapsulation!
512 * Store the packet type (eg. ETH_P_IP) for now, and we'll push on a
513 * real header when we do rebuild_header.
514 */
515 *(uint16_t *) skb_push(skb, 2) = type;
Arnaldo Carvalho de Melob0e380b2007-04-10 21:21:55 -0700516 /*
517 * XXX: Why not use skb->mac_len?
518 */
519 if (skb->network_header - skb->mac_header != 2)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700520 BUGMSG(D_NORMAL, "arcnet_header: Yikes! diff (%d) is not 2!\n",
Arnaldo Carvalho de Melob0e380b2007-04-10 21:21:55 -0700521 (int)(skb->network_header - skb->mac_header));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700522 return -2; /* return error -- can't transmit yet! */
523 }
524 else {
525 /* otherwise, we can just add the header as usual. */
526 _daddr = *(uint8_t *) daddr;
527 proto_num = lp->default_proto[_daddr];
528 proto = arc_proto_map[proto_num];
529 BUGMSG(D_DURING, "building header for %02Xh using protocol '%c'\n",
530 proto_num, proto->suffix);
531 if (proto == &arc_proto_null && arc_bcast_proto != proto) {
532 BUGMSG(D_DURING, "actually, let's use '%c' instead.\n",
533 arc_bcast_proto->suffix);
534 proto = arc_bcast_proto;
535 }
536 }
537 return proto->build_header(skb, dev, type, _daddr);
538}
539
540
541/*
542 * Rebuild the ARCnet hard header. This is called after an ARP (or in the
543 * future other address resolution) has completed on this sk_buff. We now
544 * let ARP fill in the destination field.
545 */
546static int arcnet_rebuild_header(struct sk_buff *skb)
547{
548 struct net_device *dev = skb->dev;
Wang Chen454d7c92008-11-12 23:37:49 -0800549 struct arcnet_local *lp = netdev_priv(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700550 int status = 0; /* default is failure */
551 unsigned short type;
552 uint8_t daddr=0;
553 struct ArcProto *proto;
Arnaldo Carvalho de Melob0e380b2007-04-10 21:21:55 -0700554 /*
555 * XXX: Why not use skb->mac_len?
556 */
557 if (skb->network_header - skb->mac_header != 2) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700558 BUGMSG(D_NORMAL,
Arnaldo Carvalho de Melob0e380b2007-04-10 21:21:55 -0700559 "rebuild_header: shouldn't be here! (hdrsize=%d)\n",
560 (int)(skb->network_header - skb->mac_header));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700561 return 0;
562 }
563 type = *(uint16_t *) skb_pull(skb, 2);
564 BUGMSG(D_DURING, "rebuild header for protocol %Xh\n", type);
565
566 if (type == ETH_P_IP) {
567#ifdef CONFIG_INET
568 BUGMSG(D_DURING, "rebuild header for ethernet protocol %Xh\n", type);
569 status = arp_find(&daddr, skb) ? 1 : 0;
570 BUGMSG(D_DURING, " rebuilt: dest is %d; protocol %Xh\n",
571 daddr, type);
572#endif
573 } else {
574 BUGMSG(D_NORMAL,
575 "I don't understand ethernet protocol %Xh addresses!\n", type);
Stephen Hemminger5803c512009-01-09 13:01:08 +0000576 dev->stats.tx_errors++;
577 dev->stats.tx_aborted_errors++;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700578 }
579
580 /* if we couldn't resolve the address... give up. */
581 if (!status)
582 return 0;
583
584 /* add the _real_ header this time! */
585 proto = arc_proto_map[lp->default_proto[daddr]];
586 proto->build_header(skb, dev, type, daddr);
587
588 return 1; /* success */
589}
590
591
592
593/* Called by the kernel in order to transmit a packet. */
Stephen Hemminger613573252009-08-31 19:50:58 +0000594netdev_tx_t arcnet_send_packet(struct sk_buff *skb,
595 struct net_device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700596{
Wang Chen454d7c92008-11-12 23:37:49 -0800597 struct arcnet_local *lp = netdev_priv(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700598 struct archdr *pkt;
599 struct arc_rfc1201 *soft;
600 struct ArcProto *proto;
601 int txbuf;
602 unsigned long flags;
Pieter Dejaegherec6bb15a2005-09-06 19:54:48 -0700603 int freeskb, retval;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700604
605 BUGMSG(D_DURING,
606 "transmit requested (status=%Xh, txbufs=%d/%d, len=%d, protocol %x)\n",
607 ASTATUS(), lp->cur_tx, lp->next_tx, skb->len,skb->protocol);
608
609 pkt = (struct archdr *) skb->data;
610 soft = &pkt->soft.rfc1201;
611 proto = arc_proto_map[soft->proto];
612
613 BUGMSG(D_SKB_SIZE, "skb: transmitting %d bytes to %02X\n",
614 skb->len, pkt->hard.dest);
615 BUGLVL(D_SKB) arcnet_dump_skb(dev, skb, "tx");
616
617 /* fits in one packet? */
618 if (skb->len - ARC_HDR_SIZE > XMTU && !proto->continue_tx) {
619 BUGMSG(D_NORMAL, "fixme: packet too large: compensating badly!\n");
620 dev_kfree_skb(skb);
Pieter Dejaegherec6bb15a2005-09-06 19:54:48 -0700621 return NETDEV_TX_OK; /* don't try again */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700622 }
623
624 /* We're busy transmitting a packet... */
625 netif_stop_queue(dev);
626
627 spin_lock_irqsave(&lp->lock, flags);
628 AINTMASK(0);
Pieter Dejaegherec6bb15a2005-09-06 19:54:48 -0700629 if(lp->next_tx == -1)
630 txbuf = get_arcbuf(dev);
631 else {
632 txbuf = -1;
633 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700634 if (txbuf != -1) {
635 if (proto->prepare_tx(dev, pkt, skb->len, txbuf) &&
636 !proto->ack_tx) {
637 /* done right away and we don't want to acknowledge
638 the package later - forget about it now */
Stephen Hemminger5803c512009-01-09 13:01:08 +0000639 dev->stats.tx_bytes += skb->len;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700640 freeskb = 1;
641 } else {
642 /* do it the 'split' way */
643 lp->outgoing.proto = proto;
644 lp->outgoing.skb = skb;
645 lp->outgoing.pkt = pkt;
646
Pieter Dejaegherec6bb15a2005-09-06 19:54:48 -0700647 freeskb = 0;
648
Linus Torvalds1da177e2005-04-16 15:20:36 -0700649 if (proto->continue_tx &&
650 proto->continue_tx(dev, txbuf)) {
651 BUGMSG(D_NORMAL,
652 "bug! continue_tx finished the first time! "
653 "(proto='%c')\n", proto->suffix);
654 }
655 }
Pieter Dejaegherec6bb15a2005-09-06 19:54:48 -0700656 retval = NETDEV_TX_OK;
657 dev->trans_start = jiffies;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700658 lp->next_tx = txbuf;
659 } else {
Pieter Dejaegherec6bb15a2005-09-06 19:54:48 -0700660 retval = NETDEV_TX_BUSY;
661 freeskb = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700662 }
663
Harvey Harrisonb39d66a2008-08-20 16:52:04 -0700664 BUGMSG(D_DEBUG, "%s: %d: %s, status: %x\n",__FILE__,__LINE__,__func__,ASTATUS());
Linus Torvalds1da177e2005-04-16 15:20:36 -0700665 /* make sure we didn't ignore a TX IRQ while we were in here */
666 AINTMASK(0);
667
Harvey Harrisonb39d66a2008-08-20 16:52:04 -0700668 BUGMSG(D_DEBUG, "%s: %d: %s\n",__FILE__,__LINE__,__func__);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700669 lp->intmask |= TXFREEflag|EXCNAKflag;
670 AINTMASK(lp->intmask);
Harvey Harrisonb39d66a2008-08-20 16:52:04 -0700671 BUGMSG(D_DEBUG, "%s: %d: %s, status: %x\n",__FILE__,__LINE__,__func__,ASTATUS());
Linus Torvalds1da177e2005-04-16 15:20:36 -0700672
673 spin_unlock_irqrestore(&lp->lock, flags);
674 if (freeskb) {
675 dev_kfree_skb(skb);
676 }
Pieter Dejaegherec6bb15a2005-09-06 19:54:48 -0700677 return retval; /* no need to try again */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700678}
679
680
681/*
682 * Actually start transmitting a packet that was loaded into a buffer
683 * by prepare_tx. This should _only_ be called by the interrupt handler.
684 */
685static int go_tx(struct net_device *dev)
686{
Wang Chen454d7c92008-11-12 23:37:49 -0800687 struct arcnet_local *lp = netdev_priv(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700688
689 BUGMSG(D_DURING, "go_tx: status=%Xh, intmask=%Xh, next_tx=%d, cur_tx=%d\n",
690 ASTATUS(), lp->intmask, lp->next_tx, lp->cur_tx);
691
692 if (lp->cur_tx != -1 || lp->next_tx == -1)
693 return 0;
694
695 BUGLVL(D_TX) arcnet_dump_packet(dev, lp->next_tx, "go_tx", 0);
696
697 lp->cur_tx = lp->next_tx;
698 lp->next_tx = -1;
699
700 /* start sending */
701 ACOMMAND(TXcmd | (lp->cur_tx << 3));
702
Stephen Hemminger5803c512009-01-09 13:01:08 +0000703 dev->stats.tx_packets++;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700704 lp->lasttrans_dest = lp->lastload_dest;
705 lp->lastload_dest = 0;
706 lp->excnak_pending = 0;
707 lp->intmask |= TXFREEflag|EXCNAKflag;
708
709 return 1;
710}
711
712
713/* Called by the kernel when transmit times out */
Stephen Hemmingerbca5b892009-01-09 13:01:09 +0000714void arcnet_timeout(struct net_device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700715{
716 unsigned long flags;
Wang Chen454d7c92008-11-12 23:37:49 -0800717 struct arcnet_local *lp = netdev_priv(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700718 int status = ASTATUS();
719 char *msg;
720
721 spin_lock_irqsave(&lp->lock, flags);
722 if (status & TXFREEflag) { /* transmit _DID_ finish */
723 msg = " - missed IRQ?";
724 } else {
725 msg = "";
Stephen Hemminger5803c512009-01-09 13:01:08 +0000726 dev->stats.tx_aborted_errors++;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700727 lp->timed_out = 1;
728 ACOMMAND(NOTXcmd | (lp->cur_tx << 3));
729 }
Stephen Hemminger5803c512009-01-09 13:01:08 +0000730 dev->stats.tx_errors++;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700731
732 /* make sure we didn't miss a TX or a EXC NAK IRQ */
733 AINTMASK(0);
734 lp->intmask |= TXFREEflag|EXCNAKflag;
735 AINTMASK(lp->intmask);
736
737 spin_unlock_irqrestore(&lp->lock, flags);
738
Marcelo Feitoza Parisiff5688a2006-01-09 18:37:15 -0800739 if (time_after(jiffies, lp->last_timeout + 10*HZ)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700740 BUGMSG(D_EXTRA, "tx timed out%s (status=%Xh, intmask=%Xh, dest=%02Xh)\n",
741 msg, status, lp->intmask, lp->lasttrans_dest);
742 lp->last_timeout = jiffies;
743 }
744
745 if (lp->cur_tx == -1)
746 netif_wake_queue(dev);
747}
748
749
750/*
751 * The typical workload of the driver: Handle the network interface
752 * interrupts. Establish which device needs attention, and call the correct
753 * chipset interrupt handler.
754 */
David Howells7d12e782006-10-05 14:55:46 +0100755irqreturn_t arcnet_interrupt(int irq, void *dev_id)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700756{
757 struct net_device *dev = dev_id;
758 struct arcnet_local *lp;
759 int recbuf, status, diagstatus, didsomething, boguscount;
760 int retval = IRQ_NONE;
761
762 BUGMSG(D_DURING, "\n");
763
764 BUGMSG(D_DURING, "in arcnet_interrupt\n");
Wang Chen454d7c92008-11-12 23:37:49 -0800765
766 lp = netdev_priv(dev);
Eric Sesterhenn5d9428d2006-04-02 13:52:48 +0200767 BUG_ON(!lp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700768
769 spin_lock(&lp->lock);
770
771 /*
772 * RESET flag was enabled - if device is not running, we must clear it right
773 * away (but nothing else).
774 */
775 if (!netif_running(dev)) {
776 if (ASTATUS() & RESETflag)
777 ACOMMAND(CFLAGScmd | RESETclear);
778 AINTMASK(0);
779 spin_unlock(&lp->lock);
780 return IRQ_HANDLED;
781 }
782
783 BUGMSG(D_DURING, "in arcnet_inthandler (status=%Xh, intmask=%Xh)\n",
784 ASTATUS(), lp->intmask);
785
786 boguscount = 5;
787 do {
788 status = ASTATUS();
789 diagstatus = (status >> 8) & 0xFF;
790
791 BUGMSG(D_DEBUG, "%s: %d: %s: status=%x\n",
Harvey Harrisonb39d66a2008-08-20 16:52:04 -0700792 __FILE__,__LINE__,__func__,status);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700793 didsomething = 0;
794
795 /*
796 * RESET flag was enabled - card is resetting and if RX is
797 * disabled, it's NOT because we just got a packet.
798 *
799 * The card is in an undefined state. Clear it out and start over.
800 */
801 if (status & RESETflag) {
802 BUGMSG(D_NORMAL, "spurious reset (status=%Xh)\n", status);
803 arcnet_close(dev);
804 arcnet_open(dev);
805
806 /* get out of the interrupt handler! */
807 break;
808 }
809 /*
810 * RX is inhibited - we must have received something. Prepare to
811 * receive into the next buffer.
812 *
813 * We don't actually copy the received packet from the card until
814 * after the transmit handler runs (and possibly launches the next
815 * tx); this should improve latency slightly if we get both types
816 * of interrupts at once.
817 */
818 recbuf = -1;
819 if (status & lp->intmask & NORXflag) {
820 recbuf = lp->cur_rx;
821 BUGMSG(D_DURING, "Buffer #%d: receive irq (status=%Xh)\n",
822 recbuf, status);
823
824 lp->cur_rx = get_arcbuf(dev);
825 if (lp->cur_rx != -1) {
826 BUGMSG(D_DURING, "enabling receive to buffer #%d\n",
827 lp->cur_rx);
828 ACOMMAND(RXcmd | (lp->cur_rx << 3) | RXbcasts);
829 }
830 didsomething++;
831 }
832
833 if((diagstatus & EXCNAKflag)) {
834 BUGMSG(D_DURING, "EXCNAK IRQ (diagstat=%Xh)\n",
835 diagstatus);
836
837 ACOMMAND(NOTXcmd); /* disable transmit */
838 lp->excnak_pending = 1;
839
840 ACOMMAND(EXCNAKclear);
841 lp->intmask &= ~(EXCNAKflag);
842 didsomething++;
843 }
844
845
846 /* a transmit finished, and we're interested in it. */
847 if ((status & lp->intmask & TXFREEflag) || lp->timed_out) {
848 lp->intmask &= ~(TXFREEflag|EXCNAKflag);
849
850 BUGMSG(D_DURING, "TX IRQ (stat=%Xh)\n", status);
851
852 if (lp->cur_tx != -1 && !lp->timed_out) {
853 if(!(status & TXACKflag)) {
854 if (lp->lasttrans_dest != 0) {
855 BUGMSG(D_EXTRA,
856 "transmit was not acknowledged! "
857 "(status=%Xh, dest=%02Xh)\n",
858 status, lp->lasttrans_dest);
Stephen Hemminger5803c512009-01-09 13:01:08 +0000859 dev->stats.tx_errors++;
860 dev->stats.tx_carrier_errors++;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700861 } else {
862 BUGMSG(D_DURING,
863 "broadcast was not acknowledged; that's normal "
864 "(status=%Xh, dest=%02Xh)\n",
865 status, lp->lasttrans_dest);
866 }
867 }
868
869 if (lp->outgoing.proto &&
870 lp->outgoing.proto->ack_tx) {
871 int ackstatus;
872 if(status & TXACKflag)
873 ackstatus=2;
874 else if(lp->excnak_pending)
875 ackstatus=1;
876 else
877 ackstatus=0;
878
879 lp->outgoing.proto
880 ->ack_tx(dev, ackstatus);
881 }
882 }
883 if (lp->cur_tx != -1)
884 release_arcbuf(dev, lp->cur_tx);
885
886 lp->cur_tx = -1;
887 lp->timed_out = 0;
888 didsomething++;
889
890 /* send another packet if there is one */
891 go_tx(dev);
892
893 /* continue a split packet, if any */
894 if (lp->outgoing.proto && lp->outgoing.proto->continue_tx) {
895 int txbuf = get_arcbuf(dev);
896 if (txbuf != -1) {
897 if (lp->outgoing.proto->continue_tx(dev, txbuf)) {
898 /* that was the last segment */
Stephen Hemminger5803c512009-01-09 13:01:08 +0000899 dev->stats.tx_bytes += lp->outgoing.skb->len;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700900 if(!lp->outgoing.proto->ack_tx)
901 {
902 dev_kfree_skb_irq(lp->outgoing.skb);
903 lp->outgoing.proto = NULL;
904 }
905 }
906 lp->next_tx = txbuf;
907 }
908 }
909 /* inform upper layers of idleness, if necessary */
910 if (lp->cur_tx == -1)
911 netif_wake_queue(dev);
912 }
913 /* now process the received packet, if any */
914 if (recbuf != -1) {
915 BUGLVL(D_RX) arcnet_dump_packet(dev, recbuf, "rx irq", 0);
916
917 arcnet_rx(dev, recbuf);
918 release_arcbuf(dev, recbuf);
919
920 didsomething++;
921 }
922 if (status & lp->intmask & RECONflag) {
923 ACOMMAND(CFLAGScmd | CONFIGclear);
Stephen Hemminger5803c512009-01-09 13:01:08 +0000924 dev->stats.tx_carrier_errors++;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700925
926 BUGMSG(D_RECON, "Network reconfiguration detected (status=%Xh)\n",
927 status);
Pieter Dejaegherec6bb15a2005-09-06 19:54:48 -0700928 /* MYRECON bit is at bit 7 of diagstatus */
929 if(diagstatus & 0x80)
930 BUGMSG(D_RECON,"Put out that recon myself\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700931
932 /* is the RECON info empty or old? */
933 if (!lp->first_recon || !lp->last_recon ||
S.Caglar Onur9307b572008-03-28 14:41:24 -0700934 time_after(jiffies, lp->last_recon + HZ * 10)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700935 if (lp->network_down)
936 BUGMSG(D_NORMAL, "reconfiguration detected: cabling restored?\n");
937 lp->first_recon = lp->last_recon = jiffies;
938 lp->num_recons = lp->network_down = 0;
939
940 BUGMSG(D_DURING, "recon: clearing counters.\n");
941 } else { /* add to current RECON counter */
942 lp->last_recon = jiffies;
943 lp->num_recons++;
944
945 BUGMSG(D_DURING, "recon: counter=%d, time=%lds, net=%d\n",
946 lp->num_recons,
947 (lp->last_recon - lp->first_recon) / HZ,
948 lp->network_down);
949
950 /* if network is marked up;
951 * and first_recon and last_recon are 60+ apart;
952 * and the average no. of recons counted is
953 * > RECON_THRESHOLD/min;
954 * then print a warning message.
955 */
Joe Perches8e95a202009-12-03 07:58:21 +0000956 if (!lp->network_down &&
957 (lp->last_recon - lp->first_recon) <= HZ * 60 &&
958 lp->num_recons >= RECON_THRESHOLD) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700959 lp->network_down = 1;
960 BUGMSG(D_NORMAL, "many reconfigurations detected: cabling problem?\n");
Joe Perches8e95a202009-12-03 07:58:21 +0000961 } else if (!lp->network_down &&
962 lp->last_recon - lp->first_recon > HZ * 60) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700963 /* reset counters if we've gone for over a minute. */
964 lp->first_recon = lp->last_recon;
965 lp->num_recons = 1;
966 }
967 }
S.Caglar Onur9307b572008-03-28 14:41:24 -0700968 } else if (lp->network_down &&
969 time_after(jiffies, lp->last_recon + HZ * 10)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700970 if (lp->network_down)
971 BUGMSG(D_NORMAL, "cabling restored?\n");
972 lp->first_recon = lp->last_recon = 0;
973 lp->num_recons = lp->network_down = 0;
974
975 BUGMSG(D_DURING, "not recon: clearing counters anyway.\n");
976 }
977
978 if(didsomething) {
979 retval |= IRQ_HANDLED;
980 }
981 }
982 while (--boguscount && didsomething);
983
984 BUGMSG(D_DURING, "arcnet_interrupt complete (status=%Xh, count=%d)\n",
985 ASTATUS(), boguscount);
986 BUGMSG(D_DURING, "\n");
987
988
989 AINTMASK(0);
990 udelay(1);
991 AINTMASK(lp->intmask);
992
993 spin_unlock(&lp->lock);
994 return retval;
995}
996
997
998/*
999 * This is a generic packet receiver that calls arcnet??_rx depending on the
1000 * protocol ID found.
1001 */
Adrian Bunkf03aa2d2006-01-14 03:10:22 +01001002static void arcnet_rx(struct net_device *dev, int bufnum)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001003{
Wang Chen454d7c92008-11-12 23:37:49 -08001004 struct arcnet_local *lp = netdev_priv(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001005 struct archdr pkt;
1006 struct arc_rfc1201 *soft;
1007 int length, ofs;
1008
1009 soft = &pkt.soft.rfc1201;
1010
1011 lp->hw.copy_from_card(dev, bufnum, 0, &pkt, sizeof(ARC_HDR_SIZE));
1012 if (pkt.hard.offset[0]) {
1013 ofs = pkt.hard.offset[0];
1014 length = 256 - ofs;
1015 } else {
1016 ofs = pkt.hard.offset[1];
1017 length = 512 - ofs;
1018 }
1019
1020 /* get the full header, if possible */
1021 if (sizeof(pkt.soft) <= length)
1022 lp->hw.copy_from_card(dev, bufnum, ofs, soft, sizeof(pkt.soft));
1023 else {
1024 memset(&pkt.soft, 0, sizeof(pkt.soft));
1025 lp->hw.copy_from_card(dev, bufnum, ofs, soft, length);
1026 }
1027
1028 BUGMSG(D_DURING, "Buffer #%d: received packet from %02Xh to %02Xh "
1029 "(%d+4 bytes)\n",
1030 bufnum, pkt.hard.source, pkt.hard.dest, length);
1031
Stephen Hemminger5803c512009-01-09 13:01:08 +00001032 dev->stats.rx_packets++;
1033 dev->stats.rx_bytes += length + ARC_HDR_SIZE;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001034
1035 /* call the right receiver for the protocol */
1036 if (arc_proto_map[soft->proto]->is_ip) {
1037 BUGLVL(D_PROTO) {
1038 struct ArcProto
1039 *oldp = arc_proto_map[lp->default_proto[pkt.hard.source]],
1040 *newp = arc_proto_map[soft->proto];
1041
1042 if (oldp != newp) {
1043 BUGMSG(D_PROTO,
1044 "got protocol %02Xh; encap for host %02Xh is now '%c'"
1045 " (was '%c')\n", soft->proto, pkt.hard.source,
1046 newp->suffix, oldp->suffix);
1047 }
1048 }
1049
1050 /* broadcasts will always be done with the last-used encap. */
1051 lp->default_proto[0] = soft->proto;
1052
1053 /* in striking contrast, the following isn't a hack. */
1054 lp->default_proto[pkt.hard.source] = soft->proto;
1055 }
1056 /* call the protocol-specific receiver. */
1057 arc_proto_map[soft->proto]->rx(dev, bufnum, &pkt, length);
1058}
1059
1060
Linus Torvalds1da177e2005-04-16 15:20:36 -07001061static void null_rx(struct net_device *dev, int bufnum,
1062 struct archdr *pkthdr, int length)
1063{
1064 BUGMSG(D_PROTO,
1065 "rx: don't know how to deal with proto %02Xh from host %02Xh.\n",
1066 pkthdr->soft.rfc1201.proto, pkthdr->hard.source);
1067}
1068
1069
1070static int null_build_header(struct sk_buff *skb, struct net_device *dev,
1071 unsigned short type, uint8_t daddr)
1072{
Wang Chen454d7c92008-11-12 23:37:49 -08001073 struct arcnet_local *lp = netdev_priv(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001074
1075 BUGMSG(D_PROTO,
1076 "tx: can't build header for encap %02Xh; load a protocol driver.\n",
1077 lp->default_proto[daddr]);
1078
1079 /* always fails */
1080 return 0;
1081}
1082
1083
1084/* the "do nothing" prepare_tx function warns that there's nothing to do. */
1085static int null_prepare_tx(struct net_device *dev, struct archdr *pkt,
1086 int length, int bufnum)
1087{
Wang Chen454d7c92008-11-12 23:37:49 -08001088 struct arcnet_local *lp = netdev_priv(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001089 struct arc_hardware newpkt;
1090
1091 BUGMSG(D_PROTO, "tx: no encap for this host; load a protocol driver.\n");
1092
1093 /* send a packet to myself -- will never get received, of course */
1094 newpkt.source = newpkt.dest = dev->dev_addr[0];
1095
1096 /* only one byte of actual data (and it's random) */
1097 newpkt.offset[0] = 0xFF;
1098
1099 lp->hw.copy_to_card(dev, bufnum, 0, &newpkt, ARC_HDR_SIZE);
1100
1101 return 1; /* done */
1102}