]>
Commit | Line | Data |
---|---|---|
1da177e4 LT |
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 | ||
52edc17f | 44 | #define VERSION "arcnet: v3.94 BETA 2007/02/08 - by Avery Pennarun et al.\n" |
1da177e4 LT |
45 | |
46 | #include <linux/module.h> | |
1da177e4 LT |
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> | |
ff5688ae | 54 | #include <linux/jiffies.h> |
1da177e4 LT |
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 | ||
f03aa2d8 | 64 | static void arcnet_rx(struct net_device *dev, int bufnum); |
1da177e4 LT |
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 | ||
f03aa2d8 | 75 | static struct ArcProto arc_proto_null = |
1da177e4 LT |
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); | |
1da177e4 LT |
94 | EXPORT_SYMBOL(arcnet_unregister_proto); |
95 | EXPORT_SYMBOL(arcnet_debug); | |
96 | EXPORT_SYMBOL(alloc_arcdev); | |
97 | EXPORT_SYMBOL(arcnet_interrupt); | |
bca5b893 SH |
98 | EXPORT_SYMBOL(arcnet_open); |
99 | EXPORT_SYMBOL(arcnet_close); | |
100 | EXPORT_SYMBOL(arcnet_send_packet); | |
101 | EXPORT_SYMBOL(arcnet_timeout); | |
1da177e4 LT |
102 | |
103 | /* Internal function prototypes */ | |
1da177e4 | 104 | static int arcnet_header(struct sk_buff *skb, struct net_device *dev, |
3b04ddde SH |
105 | unsigned short type, const void *daddr, |
106 | const void *saddr, unsigned len); | |
1da177e4 LT |
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 | ||
f03aa2d8 | 119 | printk("arcnet loaded.\n"); |
1da177e4 LT |
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 | { | |
ad361c98 | 160 | char hdr[32]; |
1da177e4 | 161 | |
ad361c98 JP |
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); | |
1da177e4 LT |
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)) | |
f03aa2d8 AB |
176 | static void arcnet_dump_packet(struct net_device *dev, int bufnum, |
177 | char *desc, int take_arcnet_lock) | |
1da177e4 | 178 | { |
454d7c9b | 179 | struct arcnet_local *lp = netdev_priv(dev); |
1da177e4 LT |
180 | int i, length; |
181 | unsigned long flags = 0; | |
182 | static uint8_t buf[512]; | |
ad361c98 | 183 | char hdr[32]; |
1da177e4 LT |
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 | ||
ad361c98 JP |
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); | |
1da177e4 LT |
201 | } |
202 | ||
f03aa2d8 AB |
203 | #else |
204 | ||
205 | #define arcnet_dump_packet(dev, bufnum, desc,take_arcnet_lock) do { } while (0) | |
206 | ||
1da177e4 LT |
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 | { | |
454d7c9b | 242 | struct arcnet_local *lp = netdev_priv(dev); |
1da177e4 LT |
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 | { | |
454d7c9b | 264 | struct arcnet_local *lp = netdev_priv(dev); |
1da177e4 LT |
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++) { | |
8e95a202 JP |
303 | if (arc_proto_map[count] != &arc_proto_null && |
304 | arc_proto_map[count]->mtu < mtu) { | |
1da177e4 LT |
305 | mtu = arc_proto_map[count]->mtu; |
306 | } | |
307 | } | |
308 | ||
309 | return mtu == 65535 ? XMTU : mtu; | |
310 | } | |
311 | ||
3b04ddde SH |
312 | static const struct header_ops arcnet_header_ops = { |
313 | .create = arcnet_header, | |
3b04ddde SH |
314 | }; |
315 | ||
bca5b893 SH |
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 | }; | |
1da177e4 LT |
322 | |
323 | /* Setup a struct device for ARCnet. */ | |
324 | static void arcdev_setup(struct net_device *dev) | |
325 | { | |
326 | dev->type = ARPHRD_ARCNET; | |
bca5b893 | 327 | dev->netdev_ops = &arcnet_netdev_ops; |
3b04ddde | 328 | dev->header_ops = &arcnet_header_ops; |
1da177e4 LT |
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 | ||
1da177e4 LT |
340 | } |
341 | ||
bca5b893 | 342 | struct net_device *alloc_arcdev(const char *name) |
1da177e4 LT |
343 | { |
344 | struct net_device *dev; | |
345 | ||
346 | dev = alloc_netdev(sizeof(struct arcnet_local), | |
c835a677 TG |
347 | name && *name ? name : "arc%d", NET_NAME_UNKNOWN, |
348 | arcdev_setup); | |
1da177e4 | 349 | if(dev) { |
454d7c9b | 350 | struct arcnet_local *lp = netdev_priv(dev); |
1da177e4 LT |
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 | */ | |
bca5b893 | 365 | int arcnet_open(struct net_device *dev) |
1da177e4 | 366 | { |
454d7c9b | 367 | struct arcnet_local *lp = netdev_priv(dev); |
1da177e4 LT |
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) { | |
1da177e4 LT |
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 | ||
b39d66a8 | 434 | BUGMSG(D_DEBUG, "%s: %d: %s\n",__FILE__,__LINE__,__func__); |
1da177e4 | 435 | if (ASTATUS() & RESETflag) { |
b39d66a8 | 436 | BUGMSG(D_DEBUG, "%s: %d: %s\n",__FILE__,__LINE__,__func__); |
1da177e4 LT |
437 | ACOMMAND(CFLAGScmd | RESETclear); |
438 | } | |
439 | ||
440 | ||
b39d66a8 | 441 | BUGMSG(D_DEBUG, "%s: %d: %s\n",__FILE__,__LINE__,__func__); |
1da177e4 LT |
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 | */ | |
b39d66a8 | 448 | BUGMSG(D_DEBUG, "%s: %d: %s\n",__FILE__,__LINE__,__func__); |
1da177e4 LT |
449 | lp->intmask = NORXflag | RECONflag; |
450 | AINTMASK(lp->intmask); | |
b39d66a8 | 451 | BUGMSG(D_DEBUG, "%s: %d: %s\n",__FILE__,__LINE__,__func__); |
1da177e4 LT |
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. */ | |
bca5b893 | 464 | int arcnet_close(struct net_device *dev) |
1da177e4 | 465 | { |
454d7c9b | 466 | struct arcnet_local *lp = netdev_priv(dev); |
1da177e4 LT |
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, | |
3b04ddde SH |
484 | unsigned short type, const void *daddr, |
485 | const void *saddr, unsigned len) | |
1da177e4 | 486 | { |
3b04ddde | 487 | const struct arcnet_local *lp = netdev_priv(dev); |
1da177e4 LT |
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; | |
b0e380b1 ACM |
515 | /* |
516 | * XXX: Why not use skb->mac_len? | |
517 | */ | |
518 | if (skb->network_header - skb->mac_header != 2) | |
1da177e4 | 519 | BUGMSG(D_NORMAL, "arcnet_header: Yikes! diff (%d) is not 2!\n", |
b0e380b1 | 520 | (int)(skb->network_header - skb->mac_header)); |
1da177e4 LT |
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 | ||
1da177e4 | 539 | /* Called by the kernel in order to transmit a packet. */ |
61357325 SH |
540 | netdev_tx_t arcnet_send_packet(struct sk_buff *skb, |
541 | struct net_device *dev) | |
1da177e4 | 542 | { |
454d7c9b | 543 | struct arcnet_local *lp = netdev_priv(dev); |
1da177e4 LT |
544 | struct archdr *pkt; |
545 | struct arc_rfc1201 *soft; | |
546 | struct ArcProto *proto; | |
547 | int txbuf; | |
548 | unsigned long flags; | |
c6bb15a0 | 549 | int freeskb, retval; |
1da177e4 LT |
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); | |
c6bb15a0 | 567 | return NETDEV_TX_OK; /* don't try again */ |
1da177e4 LT |
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); | |
c6bb15a0 PD |
575 | if(lp->next_tx == -1) |
576 | txbuf = get_arcbuf(dev); | |
577 | else { | |
578 | txbuf = -1; | |
579 | } | |
1da177e4 LT |
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 */ | |
5803c512 | 585 | dev->stats.tx_bytes += skb->len; |
1da177e4 LT |
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 | ||
c6bb15a0 PD |
593 | freeskb = 0; |
594 | ||
1da177e4 LT |
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 | } | |
c6bb15a0 | 602 | retval = NETDEV_TX_OK; |
1da177e4 LT |
603 | lp->next_tx = txbuf; |
604 | } else { | |
c6bb15a0 PD |
605 | retval = NETDEV_TX_BUSY; |
606 | freeskb = 0; | |
1da177e4 LT |
607 | } |
608 | ||
b39d66a8 | 609 | BUGMSG(D_DEBUG, "%s: %d: %s, status: %x\n",__FILE__,__LINE__,__func__,ASTATUS()); |
1da177e4 LT |
610 | /* make sure we didn't ignore a TX IRQ while we were in here */ |
611 | AINTMASK(0); | |
612 | ||
b39d66a8 | 613 | BUGMSG(D_DEBUG, "%s: %d: %s\n",__FILE__,__LINE__,__func__); |
1da177e4 LT |
614 | lp->intmask |= TXFREEflag|EXCNAKflag; |
615 | AINTMASK(lp->intmask); | |
b39d66a8 | 616 | BUGMSG(D_DEBUG, "%s: %d: %s, status: %x\n",__FILE__,__LINE__,__func__,ASTATUS()); |
1da177e4 LT |
617 | |
618 | spin_unlock_irqrestore(&lp->lock, flags); | |
619 | if (freeskb) { | |
620 | dev_kfree_skb(skb); | |
621 | } | |
c6bb15a0 | 622 | return retval; /* no need to try again */ |
1da177e4 LT |
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 | { | |
454d7c9b | 632 | struct arcnet_local *lp = netdev_priv(dev); |
1da177e4 LT |
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 | ||
5803c512 | 648 | dev->stats.tx_packets++; |
1da177e4 LT |
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 */ | |
bca5b893 | 659 | void arcnet_timeout(struct net_device *dev) |
1da177e4 LT |
660 | { |
661 | unsigned long flags; | |
454d7c9b | 662 | struct arcnet_local *lp = netdev_priv(dev); |
1da177e4 LT |
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 = ""; | |
5803c512 | 671 | dev->stats.tx_aborted_errors++; |
1da177e4 LT |
672 | lp->timed_out = 1; |
673 | ACOMMAND(NOTXcmd | (lp->cur_tx << 3)); | |
674 | } | |
5803c512 | 675 | dev->stats.tx_errors++; |
1da177e4 LT |
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 | ||
ff5688ae | 684 | if (time_after(jiffies, lp->last_timeout + 10*HZ)) { |
1da177e4 LT |
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 | */ | |
7d12e780 | 700 | irqreturn_t arcnet_interrupt(int irq, void *dev_id) |
1da177e4 LT |
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"); | |
454d7c9b WC |
710 | |
711 | lp = netdev_priv(dev); | |
5d9428de | 712 | BUG_ON(!lp); |
1da177e4 LT |
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); | |
226ee675 | 725 | return retval; |
1da177e4 LT |
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", | |
b39d66a8 | 737 | __FILE__,__LINE__,__func__,status); |
1da177e4 LT |
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); | |
5803c512 SH |
804 | dev->stats.tx_errors++; |
805 | dev->stats.tx_carrier_errors++; | |
1da177e4 LT |
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 */ | |
5803c512 | 844 | dev->stats.tx_bytes += lp->outgoing.skb->len; |
1da177e4 LT |
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); | |
5803c512 | 869 | dev->stats.tx_carrier_errors++; |
1da177e4 LT |
870 | |
871 | BUGMSG(D_RECON, "Network reconfiguration detected (status=%Xh)\n", | |
872 | status); | |
c6bb15a0 PD |
873 | /* MYRECON bit is at bit 7 of diagstatus */ |
874 | if(diagstatus & 0x80) | |
875 | BUGMSG(D_RECON,"Put out that recon myself\n"); | |
1da177e4 LT |
876 | |
877 | /* is the RECON info empty or old? */ | |
878 | if (!lp->first_recon || !lp->last_recon || | |
9307b570 | 879 | time_after(jiffies, lp->last_recon + HZ * 10)) { |
1da177e4 LT |
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 | */ | |
8e95a202 JP |
901 | if (!lp->network_down && |
902 | (lp->last_recon - lp->first_recon) <= HZ * 60 && | |
903 | lp->num_recons >= RECON_THRESHOLD) { | |
1da177e4 LT |
904 | lp->network_down = 1; |
905 | BUGMSG(D_NORMAL, "many reconfigurations detected: cabling problem?\n"); | |
8e95a202 JP |
906 | } else if (!lp->network_down && |
907 | lp->last_recon - lp->first_recon > HZ * 60) { | |
1da177e4 LT |
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 | } | |
9307b570 ÇO |
913 | } else if (lp->network_down && |
914 | time_after(jiffies, lp->last_recon + HZ * 10)) { | |
1da177e4 LT |
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 | */ | |
f03aa2d8 | 947 | static void arcnet_rx(struct net_device *dev, int bufnum) |
1da177e4 | 948 | { |
454d7c9b | 949 | struct arcnet_local *lp = netdev_priv(dev); |
1da177e4 LT |
950 | struct archdr pkt; |
951 | struct arc_rfc1201 *soft; | |
952 | int length, ofs; | |
953 | ||
954 | soft = &pkt.soft.rfc1201; | |
955 | ||
087d273c | 956 | lp->hw.copy_from_card(dev, bufnum, 0, &pkt, ARC_HDR_SIZE); |
1da177e4 LT |
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 | ||
5803c512 SH |
977 | dev->stats.rx_packets++; |
978 | dev->stats.rx_bytes += length + ARC_HDR_SIZE; | |
1da177e4 LT |
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 | ||
1da177e4 LT |
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 | { | |
454d7c9b | 1018 | struct arcnet_local *lp = netdev_priv(dev); |
1da177e4 LT |
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 | { | |
454d7c9b | 1033 | struct arcnet_local *lp = netdev_priv(dev); |
1da177e4 LT |
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 | } |