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 pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
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/jiffies.h> |
54 | #include <linux/errqueue.h> |
55 | |
56 | #include <linux/leds.h> |
57 | |
58 | #include "arcdevice.h" |
59 | #include "com9026.h" |
60 | |
61 | /* "do nothing" functions for protocol drivers */ |
62 | static void null_rx(struct net_device *dev, int bufnum, |
63 | struct archdr *pkthdr, int length); |
64 | static int null_build_header(struct sk_buff *skb, struct net_device *dev, |
65 | unsigned short type, uint8_t daddr); |
66 | static int null_prepare_tx(struct net_device *dev, struct archdr *pkt, |
67 | int length, int bufnum); |
68 | |
69 | static void arcnet_rx(struct net_device *dev, int bufnum); |
70 | |
71 | /* one ArcProto per possible proto ID. None of the elements of |
72 | * arc_proto_map are allowed to be NULL; they will get set to |
73 | * arc_proto_default instead. It also must not be NULL; if you would like |
74 | * to set it to NULL, set it to &arc_proto_null instead. |
75 | */ |
76 | struct ArcProto *arc_proto_map[256]; |
77 | EXPORT_SYMBOL(arc_proto_map); |
78 | |
79 | struct ArcProto *arc_proto_default; |
80 | EXPORT_SYMBOL(arc_proto_default); |
81 | |
82 | struct ArcProto *arc_bcast_proto; |
83 | EXPORT_SYMBOL(arc_bcast_proto); |
84 | |
85 | struct ArcProto *arc_raw_proto; |
86 | EXPORT_SYMBOL(arc_raw_proto); |
87 | |
88 | static struct ArcProto arc_proto_null = { |
89 | .suffix = '?', |
90 | .mtu = XMTU, |
91 | .is_ip = 0, |
92 | .rx = null_rx, |
93 | .build_header = null_build_header, |
94 | .prepare_tx = null_prepare_tx, |
95 | .continue_tx = NULL, |
96 | .ack_tx = NULL |
97 | }; |
98 | |
99 | /* Exported function prototypes */ |
100 | int arcnet_debug = ARCNET_DEBUG; |
101 | EXPORT_SYMBOL(arcnet_debug); |
102 | |
103 | /* Internal function prototypes */ |
104 | static int arcnet_header(struct sk_buff *skb, struct net_device *dev, |
105 | unsigned short type, const void *daddr, |
106 | const void *saddr, unsigned len); |
107 | static int go_tx(struct net_device *dev); |
108 | |
109 | static int debug = ARCNET_DEBUG; |
110 | module_param(debug, int, 0); |
111 | MODULE_LICENSE("GPL" ); |
112 | |
113 | static int __init arcnet_init(void) |
114 | { |
115 | int count; |
116 | |
117 | arcnet_debug = debug; |
118 | |
119 | pr_info("arcnet loaded\n" ); |
120 | |
121 | /* initialize the protocol map */ |
122 | arc_raw_proto = arc_proto_default = arc_bcast_proto = &arc_proto_null; |
123 | for (count = 0; count < 256; count++) |
124 | arc_proto_map[count] = arc_proto_default; |
125 | |
126 | if (BUGLVL(D_DURING)) |
127 | pr_info("struct sizes: %zd %zd %zd %zd %zd\n" , |
128 | sizeof(struct arc_hardware), |
129 | sizeof(struct arc_rfc1201), |
130 | sizeof(struct arc_rfc1051), |
131 | sizeof(struct arc_eth_encap), |
132 | sizeof(struct archdr)); |
133 | |
134 | return 0; |
135 | } |
136 | |
137 | static void __exit arcnet_exit(void) |
138 | { |
139 | } |
140 | |
141 | module_init(arcnet_init); |
142 | module_exit(arcnet_exit); |
143 | |
144 | /* Dump the contents of an sk_buff */ |
145 | #if ARCNET_DEBUG_MAX & D_SKB |
146 | void arcnet_dump_skb(struct net_device *dev, |
147 | struct sk_buff *skb, char *desc) |
148 | { |
149 | char hdr[32]; |
150 | |
151 | /* dump the packet */ |
152 | snprintf(hdr, sizeof(hdr), "%6s:%s skb->data:" , dev->name, desc); |
153 | print_hex_dump(KERN_DEBUG, hdr, DUMP_PREFIX_OFFSET, |
154 | 16, 1, skb->data, skb->len, true); |
155 | } |
156 | EXPORT_SYMBOL(arcnet_dump_skb); |
157 | #endif |
158 | |
159 | /* Dump the contents of an ARCnet buffer */ |
160 | #if (ARCNET_DEBUG_MAX & (D_RX | D_TX)) |
161 | static void arcnet_dump_packet(struct net_device *dev, int bufnum, |
162 | char *desc, int take_arcnet_lock) |
163 | { |
164 | struct arcnet_local *lp = netdev_priv(dev); |
165 | int i, length; |
166 | unsigned long flags = 0; |
167 | static uint8_t buf[512]; |
168 | char hdr[32]; |
169 | |
170 | /* hw.copy_from_card expects IRQ context so take the IRQ lock |
171 | * to keep it single threaded |
172 | */ |
173 | if (take_arcnet_lock) |
174 | spin_lock_irqsave(&lp->lock, flags); |
175 | |
176 | lp->hw.copy_from_card(dev, bufnum, 0, buf, 512); |
177 | if (take_arcnet_lock) |
178 | spin_unlock_irqrestore(&lp->lock, flags); |
179 | |
180 | /* if the offset[0] byte is nonzero, this is a 256-byte packet */ |
181 | length = (buf[2] ? 256 : 512); |
182 | |
183 | /* dump the packet */ |
184 | snprintf(hdr, sizeof(hdr), "%6s:%s packet dump:" , dev->name, desc); |
185 | print_hex_dump(KERN_DEBUG, hdr, DUMP_PREFIX_OFFSET, |
186 | 16, 1, buf, length, true); |
187 | } |
188 | |
189 | #else |
190 | |
191 | #define arcnet_dump_packet(dev, bufnum, desc, take_arcnet_lock) do { } while (0) |
192 | |
193 | #endif |
194 | |
195 | /* Trigger a LED event in response to a ARCNET device event */ |
196 | void arcnet_led_event(struct net_device *dev, enum arcnet_led_event event) |
197 | { |
198 | struct arcnet_local *lp = netdev_priv(dev); |
199 | unsigned long led_delay = 350; |
200 | unsigned long tx_delay = 50; |
201 | |
202 | switch (event) { |
203 | case ARCNET_LED_EVENT_RECON: |
204 | led_trigger_blink_oneshot(lp->recon_led_trig, |
205 | &led_delay, &led_delay, 0); |
206 | break; |
207 | case ARCNET_LED_EVENT_OPEN: |
208 | led_trigger_event(lp->tx_led_trig, LED_OFF); |
209 | led_trigger_event(lp->recon_led_trig, LED_OFF); |
210 | break; |
211 | case ARCNET_LED_EVENT_STOP: |
212 | led_trigger_event(lp->tx_led_trig, LED_OFF); |
213 | led_trigger_event(lp->recon_led_trig, LED_OFF); |
214 | break; |
215 | case ARCNET_LED_EVENT_TX: |
216 | led_trigger_blink_oneshot(lp->tx_led_trig, |
217 | &tx_delay, &tx_delay, 0); |
218 | break; |
219 | } |
220 | } |
221 | EXPORT_SYMBOL_GPL(arcnet_led_event); |
222 | |
223 | static void arcnet_led_release(struct device *gendev, void *res) |
224 | { |
225 | struct arcnet_local *lp = netdev_priv(to_net_dev(gendev)); |
226 | |
227 | led_trigger_unregister_simple(lp->tx_led_trig); |
228 | led_trigger_unregister_simple(lp->recon_led_trig); |
229 | } |
230 | |
231 | /* Register ARCNET LED triggers for a arcnet device |
232 | * |
233 | * This is normally called from a driver's probe function |
234 | */ |
235 | void devm_arcnet_led_init(struct net_device *netdev, int index, int subid) |
236 | { |
237 | struct arcnet_local *lp = netdev_priv(netdev); |
238 | void *res; |
239 | |
240 | res = devres_alloc(arcnet_led_release, 0, GFP_KERNEL); |
241 | if (!res) { |
242 | netdev_err(netdev, "cannot register LED triggers\n" ); |
243 | return; |
244 | } |
245 | |
246 | snprintf(lp->tx_led_trig_name, sizeof(lp->tx_led_trig_name), |
247 | "arc%d-%d-tx" , index, subid); |
248 | snprintf(lp->recon_led_trig_name, sizeof(lp->recon_led_trig_name), |
249 | "arc%d-%d-recon" , index, subid); |
250 | |
251 | led_trigger_register_simple(lp->tx_led_trig_name, |
252 | &lp->tx_led_trig); |
253 | led_trigger_register_simple(lp->recon_led_trig_name, |
254 | &lp->recon_led_trig); |
255 | |
256 | devres_add(&netdev->dev, res); |
257 | } |
258 | EXPORT_SYMBOL_GPL(devm_arcnet_led_init); |
259 | |
260 | /* Unregister a protocol driver from the arc_proto_map. Protocol drivers |
261 | * are responsible for registering themselves, but the unregister routine |
262 | * is pretty generic so we'll do it here. |
263 | */ |
264 | void arcnet_unregister_proto(struct ArcProto *proto) |
265 | { |
266 | int count; |
267 | |
268 | if (arc_proto_default == proto) |
269 | arc_proto_default = &arc_proto_null; |
270 | if (arc_bcast_proto == proto) |
271 | arc_bcast_proto = arc_proto_default; |
272 | if (arc_raw_proto == proto) |
273 | arc_raw_proto = arc_proto_default; |
274 | |
275 | for (count = 0; count < 256; count++) { |
276 | if (arc_proto_map[count] == proto) |
277 | arc_proto_map[count] = arc_proto_default; |
278 | } |
279 | } |
280 | EXPORT_SYMBOL(arcnet_unregister_proto); |
281 | |
282 | /* Add a buffer to the queue. Only the interrupt handler is allowed to do |
283 | * this, unless interrupts are disabled. |
284 | * |
285 | * Note: we don't check for a full queue, since there aren't enough buffers |
286 | * to more than fill it. |
287 | */ |
288 | static void release_arcbuf(struct net_device *dev, int bufnum) |
289 | { |
290 | struct arcnet_local *lp = netdev_priv(dev); |
291 | int i; |
292 | |
293 | lp->buf_queue[lp->first_free_buf++] = bufnum; |
294 | lp->first_free_buf %= 5; |
295 | |
296 | if (BUGLVL(D_DURING)) { |
297 | arc_printk(D_DURING, dev, "release_arcbuf: freed #%d; buffer queue is now: " , |
298 | bufnum); |
299 | for (i = lp->next_buf; i != lp->first_free_buf; i = (i + 1) % 5) |
300 | arc_cont(D_DURING, "#%d " , lp->buf_queue[i]); |
301 | arc_cont(D_DURING, "\n" ); |
302 | } |
303 | } |
304 | |
305 | /* Get a buffer from the queue. |
306 | * If this returns -1, there are no buffers available. |
307 | */ |
308 | static int get_arcbuf(struct net_device *dev) |
309 | { |
310 | struct arcnet_local *lp = netdev_priv(dev); |
311 | int buf = -1, i; |
312 | |
313 | if (!atomic_dec_and_test(&lp->buf_lock)) { |
314 | /* already in this function */ |
315 | arc_printk(D_NORMAL, dev, "get_arcbuf: overlap (%d)!\n" , |
316 | lp->buf_lock.counter); |
317 | } else { /* we can continue */ |
318 | if (lp->next_buf >= 5) |
319 | lp->next_buf -= 5; |
320 | |
321 | if (lp->next_buf == lp->first_free_buf) { |
322 | arc_printk(D_NORMAL, dev, "get_arcbuf: BUG: no buffers are available??\n" ); |
323 | } else { |
324 | buf = lp->buf_queue[lp->next_buf++]; |
325 | lp->next_buf %= 5; |
326 | } |
327 | } |
328 | |
329 | if (BUGLVL(D_DURING)) { |
330 | arc_printk(D_DURING, dev, "get_arcbuf: got #%d; buffer queue is now: " , |
331 | buf); |
332 | for (i = lp->next_buf; i != lp->first_free_buf; i = (i + 1) % 5) |
333 | arc_cont(D_DURING, "#%d " , lp->buf_queue[i]); |
334 | arc_cont(D_DURING, "\n" ); |
335 | } |
336 | |
337 | atomic_inc(&lp->buf_lock); |
338 | return buf; |
339 | } |
340 | |
341 | static int choose_mtu(void) |
342 | { |
343 | int count, mtu = 65535; |
344 | |
345 | /* choose the smallest MTU of all available encaps */ |
346 | for (count = 0; count < 256; count++) { |
347 | if (arc_proto_map[count] != &arc_proto_null && |
348 | arc_proto_map[count]->mtu < mtu) { |
349 | mtu = arc_proto_map[count]->mtu; |
350 | } |
351 | } |
352 | |
353 | return mtu == 65535 ? XMTU : mtu; |
354 | } |
355 | |
356 | static const struct header_ops = { |
357 | .create = arcnet_header, |
358 | }; |
359 | |
360 | static const struct net_device_ops arcnet_netdev_ops = { |
361 | .ndo_open = arcnet_open, |
362 | .ndo_stop = arcnet_close, |
363 | .ndo_start_xmit = arcnet_send_packet, |
364 | .ndo_tx_timeout = arcnet_timeout, |
365 | }; |
366 | |
367 | /* Setup a struct device for ARCnet. */ |
368 | static void arcdev_setup(struct net_device *dev) |
369 | { |
370 | dev->type = ARPHRD_ARCNET; |
371 | dev->netdev_ops = &arcnet_netdev_ops; |
372 | dev->header_ops = &arcnet_header_ops; |
373 | dev->hard_header_len = sizeof(struct arc_hardware); |
374 | dev->mtu = choose_mtu(); |
375 | |
376 | dev->addr_len = ARCNET_ALEN; |
377 | dev->tx_queue_len = 100; |
378 | dev->broadcast[0] = 0x00; /* for us, broadcasts are address 0 */ |
379 | dev->watchdog_timeo = TX_TIMEOUT; |
380 | |
381 | /* New-style flags. */ |
382 | dev->flags = IFF_BROADCAST; |
383 | } |
384 | |
385 | static void arcnet_timer(struct timer_list *t) |
386 | { |
387 | struct arcnet_local *lp = from_timer(lp, t, timer); |
388 | struct net_device *dev = lp->dev; |
389 | |
390 | if (!netif_carrier_ok(dev)) { |
391 | netif_carrier_on(dev); |
392 | netdev_info(dev, "link up\n" ); |
393 | } |
394 | } |
395 | |
396 | static void arcnet_reply_tasklet(unsigned long data) |
397 | { |
398 | struct arcnet_local *lp = (struct arcnet_local *)data; |
399 | |
400 | struct sk_buff *ackskb, *skb; |
401 | struct sock_exterr_skb *serr; |
402 | struct sock *sk; |
403 | int ret; |
404 | |
405 | local_irq_disable(); |
406 | skb = lp->outgoing.skb; |
407 | if (!skb || !skb->sk) { |
408 | local_irq_enable(); |
409 | return; |
410 | } |
411 | |
412 | sock_hold(skb->sk); |
413 | sk = skb->sk; |
414 | ackskb = skb_clone_sk(skb); |
415 | sock_put(skb->sk); |
416 | |
417 | if (!ackskb) { |
418 | local_irq_enable(); |
419 | return; |
420 | } |
421 | |
422 | serr = SKB_EXT_ERR(ackskb); |
423 | memset(serr, 0, sizeof(*serr)); |
424 | serr->ee.ee_errno = ENOMSG; |
425 | serr->ee.ee_origin = SO_EE_ORIGIN_TXSTATUS; |
426 | serr->ee.ee_data = skb_shinfo(skb)->tskey; |
427 | serr->ee.ee_info = lp->reply_status; |
428 | |
429 | /* finally erasing outgoing skb */ |
430 | dev_kfree_skb(lp->outgoing.skb); |
431 | lp->outgoing.skb = NULL; |
432 | |
433 | ackskb->dev = lp->dev; |
434 | |
435 | ret = sock_queue_err_skb(sk, ackskb); |
436 | if (ret) |
437 | kfree_skb(ackskb); |
438 | |
439 | local_irq_enable(); |
440 | }; |
441 | |
442 | struct net_device *alloc_arcdev(const char *name) |
443 | { |
444 | struct net_device *dev; |
445 | |
446 | dev = alloc_netdev(sizeof(struct arcnet_local), |
447 | name && *name ? name : "arc%d" , NET_NAME_UNKNOWN, |
448 | arcdev_setup); |
449 | if (dev) { |
450 | struct arcnet_local *lp = netdev_priv(dev); |
451 | |
452 | lp->dev = dev; |
453 | spin_lock_init(&lp->lock); |
454 | timer_setup(&lp->timer, arcnet_timer, 0); |
455 | } |
456 | |
457 | return dev; |
458 | } |
459 | EXPORT_SYMBOL(alloc_arcdev); |
460 | |
461 | /* Open/initialize the board. This is called sometime after booting when |
462 | * the 'ifconfig' program is run. |
463 | * |
464 | * This routine should set everything up anew at each open, even registers |
465 | * that "should" only need to be set once at boot, so that there is |
466 | * non-reboot way to recover if something goes wrong. |
467 | */ |
468 | int arcnet_open(struct net_device *dev) |
469 | { |
470 | struct arcnet_local *lp = netdev_priv(dev); |
471 | int count, newmtu, error; |
472 | |
473 | arc_printk(D_INIT, dev, "opened." ); |
474 | |
475 | if (!try_module_get(lp->hw.owner)) |
476 | return -ENODEV; |
477 | |
478 | if (BUGLVL(D_PROTO)) { |
479 | arc_printk(D_PROTO, dev, "protocol map (default is '%c'): " , |
480 | arc_proto_default->suffix); |
481 | for (count = 0; count < 256; count++) |
482 | arc_cont(D_PROTO, "%c" , arc_proto_map[count]->suffix); |
483 | arc_cont(D_PROTO, "\n" ); |
484 | } |
485 | |
486 | tasklet_init(&lp->reply_tasklet, arcnet_reply_tasklet, |
487 | (unsigned long)lp); |
488 | |
489 | arc_printk(D_INIT, dev, "arcnet_open: resetting card.\n" ); |
490 | |
491 | /* try to put the card in a defined state - if it fails the first |
492 | * time, actually reset it. |
493 | */ |
494 | error = -ENODEV; |
495 | if (lp->hw.reset(dev, 0) && lp->hw.reset(dev, 1)) |
496 | goto out_module_put; |
497 | |
498 | newmtu = choose_mtu(); |
499 | if (newmtu < dev->mtu) |
500 | dev->mtu = newmtu; |
501 | |
502 | arc_printk(D_INIT, dev, "arcnet_open: mtu: %d.\n" , dev->mtu); |
503 | |
504 | /* autodetect the encapsulation for each host. */ |
505 | memset(lp->default_proto, 0, sizeof(lp->default_proto)); |
506 | |
507 | /* the broadcast address is special - use the 'bcast' protocol */ |
508 | for (count = 0; count < 256; count++) { |
509 | if (arc_proto_map[count] == arc_bcast_proto) { |
510 | lp->default_proto[0] = count; |
511 | break; |
512 | } |
513 | } |
514 | |
515 | /* initialize buffers */ |
516 | atomic_set(&lp->buf_lock, 1); |
517 | |
518 | lp->next_buf = lp->first_free_buf = 0; |
519 | release_arcbuf(dev, 0); |
520 | release_arcbuf(dev, 1); |
521 | release_arcbuf(dev, 2); |
522 | release_arcbuf(dev, 3); |
523 | lp->cur_tx = lp->next_tx = -1; |
524 | lp->cur_rx = -1; |
525 | |
526 | lp->rfc1201.sequence = 1; |
527 | |
528 | /* bring up the hardware driver */ |
529 | if (lp->hw.open) |
530 | lp->hw.open(dev); |
531 | |
532 | if (dev->dev_addr[0] == 0) |
533 | arc_printk(D_NORMAL, dev, "WARNING! Station address 00 is reserved for broadcasts!\n" ); |
534 | else if (dev->dev_addr[0] == 255) |
535 | arc_printk(D_NORMAL, dev, "WARNING! Station address FF may confuse DOS networking programs!\n" ); |
536 | |
537 | arc_printk(D_DEBUG, dev, "%s: %d: %s\n" , __FILE__, __LINE__, __func__); |
538 | if (lp->hw.status(dev) & RESETflag) { |
539 | arc_printk(D_DEBUG, dev, "%s: %d: %s\n" , |
540 | __FILE__, __LINE__, __func__); |
541 | lp->hw.command(dev, CFLAGScmd | RESETclear); |
542 | } |
543 | |
544 | arc_printk(D_DEBUG, dev, "%s: %d: %s\n" , __FILE__, __LINE__, __func__); |
545 | /* make sure we're ready to receive IRQ's. */ |
546 | lp->hw.intmask(dev, 0); |
547 | udelay(1); /* give it time to set the mask before |
548 | * we reset it again. (may not even be |
549 | * necessary) |
550 | */ |
551 | arc_printk(D_DEBUG, dev, "%s: %d: %s\n" , __FILE__, __LINE__, __func__); |
552 | lp->intmask = NORXflag | RECONflag; |
553 | lp->hw.intmask(dev, lp->intmask); |
554 | arc_printk(D_DEBUG, dev, "%s: %d: %s\n" , __FILE__, __LINE__, __func__); |
555 | |
556 | netif_carrier_off(dev); |
557 | netif_start_queue(dev); |
558 | mod_timer(&lp->timer, jiffies + msecs_to_jiffies(1000)); |
559 | |
560 | arcnet_led_event(dev, ARCNET_LED_EVENT_OPEN); |
561 | return 0; |
562 | |
563 | out_module_put: |
564 | module_put(lp->hw.owner); |
565 | return error; |
566 | } |
567 | EXPORT_SYMBOL(arcnet_open); |
568 | |
569 | /* The inverse routine to arcnet_open - shuts down the card. */ |
570 | int arcnet_close(struct net_device *dev) |
571 | { |
572 | struct arcnet_local *lp = netdev_priv(dev); |
573 | |
574 | arcnet_led_event(dev, ARCNET_LED_EVENT_STOP); |
575 | del_timer_sync(&lp->timer); |
576 | |
577 | netif_stop_queue(dev); |
578 | netif_carrier_off(dev); |
579 | |
580 | tasklet_kill(&lp->reply_tasklet); |
581 | |
582 | /* flush TX and disable RX */ |
583 | lp->hw.intmask(dev, 0); |
584 | lp->hw.command(dev, NOTXcmd); /* stop transmit */ |
585 | lp->hw.command(dev, NORXcmd); /* disable receive */ |
586 | mdelay(1); |
587 | |
588 | /* shut down the card */ |
589 | lp->hw.close(dev); |
590 | module_put(lp->hw.owner); |
591 | return 0; |
592 | } |
593 | EXPORT_SYMBOL(arcnet_close); |
594 | |
595 | static int (struct sk_buff *skb, struct net_device *dev, |
596 | unsigned short type, const void *daddr, |
597 | const void *saddr, unsigned len) |
598 | { |
599 | const struct arcnet_local *lp = netdev_priv(dev); |
600 | uint8_t _daddr, proto_num; |
601 | struct ArcProto *proto; |
602 | |
603 | arc_printk(D_DURING, dev, |
604 | "create header from %d to %d; protocol %d (%Xh); size %u.\n" , |
605 | saddr ? *(uint8_t *)saddr : -1, |
606 | daddr ? *(uint8_t *)daddr : -1, |
607 | type, type, len); |
608 | |
609 | if (skb->len != 0 && len != skb->len) |
610 | arc_printk(D_NORMAL, dev, "arcnet_header: Yikes! skb->len(%d) != len(%d)!\n" , |
611 | skb->len, len); |
612 | |
613 | /* Type is host order - ? */ |
614 | if (type == ETH_P_ARCNET) { |
615 | proto = arc_raw_proto; |
616 | arc_printk(D_DEBUG, dev, "arc_raw_proto used. proto='%c'\n" , |
617 | proto->suffix); |
618 | _daddr = daddr ? *(uint8_t *)daddr : 0; |
619 | } else if (!daddr) { |
620 | /* if the dest addr isn't provided, we can't choose an |
621 | * encapsulation! Store the packet type (eg. ETH_P_IP) |
622 | * for now, and we'll push on a real header when we do |
623 | * rebuild_header. |
624 | */ |
625 | *(uint16_t *)skb_push(skb, 2) = type; |
626 | /* XXX: Why not use skb->mac_len? */ |
627 | if (skb->network_header - skb->mac_header != 2) |
628 | arc_printk(D_NORMAL, dev, "arcnet_header: Yikes! diff (%u) is not 2!\n" , |
629 | skb->network_header - skb->mac_header); |
630 | return -2; /* return error -- can't transmit yet! */ |
631 | } else { |
632 | /* otherwise, we can just add the header as usual. */ |
633 | _daddr = *(uint8_t *)daddr; |
634 | proto_num = lp->default_proto[_daddr]; |
635 | proto = arc_proto_map[proto_num]; |
636 | arc_printk(D_DURING, dev, "building header for %02Xh using protocol '%c'\n" , |
637 | proto_num, proto->suffix); |
638 | if (proto == &arc_proto_null && arc_bcast_proto != proto) { |
639 | arc_printk(D_DURING, dev, "actually, let's use '%c' instead.\n" , |
640 | arc_bcast_proto->suffix); |
641 | proto = arc_bcast_proto; |
642 | } |
643 | } |
644 | return proto->build_header(skb, dev, type, _daddr); |
645 | } |
646 | |
647 | /* Called by the kernel in order to transmit a packet. */ |
648 | netdev_tx_t arcnet_send_packet(struct sk_buff *skb, |
649 | struct net_device *dev) |
650 | { |
651 | struct arcnet_local *lp = netdev_priv(dev); |
652 | struct archdr *pkt; |
653 | struct arc_rfc1201 *soft; |
654 | struct ArcProto *proto; |
655 | int txbuf; |
656 | unsigned long flags; |
657 | int retval; |
658 | |
659 | arc_printk(D_DURING, dev, |
660 | "transmit requested (status=%Xh, txbufs=%d/%d, len=%d, protocol %x)\n" , |
661 | lp->hw.status(dev), lp->cur_tx, lp->next_tx, skb->len, skb->protocol); |
662 | |
663 | pkt = (struct archdr *)skb->data; |
664 | soft = &pkt->soft.rfc1201; |
665 | proto = arc_proto_map[soft->proto]; |
666 | |
667 | arc_printk(D_SKB_SIZE, dev, "skb: transmitting %d bytes to %02X\n" , |
668 | skb->len, pkt->hard.dest); |
669 | if (BUGLVL(D_SKB)) |
670 | arcnet_dump_skb(dev, skb, "tx" ); |
671 | |
672 | /* fits in one packet? */ |
673 | if (skb->len - ARC_HDR_SIZE > XMTU && !proto->continue_tx) { |
674 | arc_printk(D_NORMAL, dev, "fixme: packet too large: compensating badly!\n" ); |
675 | dev_kfree_skb(skb); |
676 | return NETDEV_TX_OK; /* don't try again */ |
677 | } |
678 | |
679 | /* We're busy transmitting a packet... */ |
680 | netif_stop_queue(dev); |
681 | |
682 | spin_lock_irqsave(&lp->lock, flags); |
683 | lp->hw.intmask(dev, 0); |
684 | if (lp->next_tx == -1) |
685 | txbuf = get_arcbuf(dev); |
686 | else |
687 | txbuf = -1; |
688 | |
689 | if (txbuf != -1) { |
690 | lp->outgoing.skb = skb; |
691 | if (proto->prepare_tx(dev, pkt, skb->len, txbuf) && |
692 | !proto->ack_tx) { |
693 | /* done right away and we don't want to acknowledge |
694 | * the package later - forget about it now |
695 | */ |
696 | dev->stats.tx_bytes += skb->len; |
697 | } else { |
698 | /* do it the 'split' way */ |
699 | lp->outgoing.proto = proto; |
700 | lp->outgoing.skb = skb; |
701 | lp->outgoing.pkt = pkt; |
702 | |
703 | if (proto->continue_tx && |
704 | proto->continue_tx(dev, txbuf)) { |
705 | arc_printk(D_NORMAL, dev, |
706 | "bug! continue_tx finished the first time! (proto='%c')\n" , |
707 | proto->suffix); |
708 | } |
709 | } |
710 | retval = NETDEV_TX_OK; |
711 | lp->next_tx = txbuf; |
712 | } else { |
713 | retval = NETDEV_TX_BUSY; |
714 | } |
715 | |
716 | arc_printk(D_DEBUG, dev, "%s: %d: %s, status: %x\n" , |
717 | __FILE__, __LINE__, __func__, lp->hw.status(dev)); |
718 | /* make sure we didn't ignore a TX IRQ while we were in here */ |
719 | lp->hw.intmask(dev, 0); |
720 | |
721 | arc_printk(D_DEBUG, dev, "%s: %d: %s\n" , __FILE__, __LINE__, __func__); |
722 | lp->intmask |= TXFREEflag | EXCNAKflag; |
723 | lp->hw.intmask(dev, lp->intmask); |
724 | arc_printk(D_DEBUG, dev, "%s: %d: %s, status: %x\n" , |
725 | __FILE__, __LINE__, __func__, lp->hw.status(dev)); |
726 | |
727 | arcnet_led_event(dev, ARCNET_LED_EVENT_TX); |
728 | |
729 | spin_unlock_irqrestore(&lp->lock, flags); |
730 | return retval; /* no need to try again */ |
731 | } |
732 | EXPORT_SYMBOL(arcnet_send_packet); |
733 | |
734 | /* Actually start transmitting a packet that was loaded into a buffer |
735 | * by prepare_tx. This should _only_ be called by the interrupt handler. |
736 | */ |
737 | static int go_tx(struct net_device *dev) |
738 | { |
739 | struct arcnet_local *lp = netdev_priv(dev); |
740 | |
741 | arc_printk(D_DURING, dev, "go_tx: status=%Xh, intmask=%Xh, next_tx=%d, cur_tx=%d\n" , |
742 | lp->hw.status(dev), lp->intmask, lp->next_tx, lp->cur_tx); |
743 | |
744 | if (lp->cur_tx != -1 || lp->next_tx == -1) |
745 | return 0; |
746 | |
747 | if (BUGLVL(D_TX)) |
748 | arcnet_dump_packet(dev, lp->next_tx, "go_tx" , 0); |
749 | |
750 | lp->cur_tx = lp->next_tx; |
751 | lp->next_tx = -1; |
752 | |
753 | /* start sending */ |
754 | lp->hw.command(dev, TXcmd | (lp->cur_tx << 3)); |
755 | |
756 | dev->stats.tx_packets++; |
757 | lp->lasttrans_dest = lp->lastload_dest; |
758 | lp->lastload_dest = 0; |
759 | lp->excnak_pending = 0; |
760 | lp->intmask |= TXFREEflag | EXCNAKflag; |
761 | |
762 | return 1; |
763 | } |
764 | |
765 | /* Called by the kernel when transmit times out */ |
766 | void arcnet_timeout(struct net_device *dev) |
767 | { |
768 | unsigned long flags; |
769 | struct arcnet_local *lp = netdev_priv(dev); |
770 | int status = lp->hw.status(dev); |
771 | char *msg; |
772 | |
773 | spin_lock_irqsave(&lp->lock, flags); |
774 | if (status & TXFREEflag) { /* transmit _DID_ finish */ |
775 | msg = " - missed IRQ?" ; |
776 | } else { |
777 | msg = "" ; |
778 | dev->stats.tx_aborted_errors++; |
779 | lp->timed_out = 1; |
780 | lp->hw.command(dev, NOTXcmd | (lp->cur_tx << 3)); |
781 | } |
782 | dev->stats.tx_errors++; |
783 | |
784 | /* make sure we didn't miss a TX or a EXC NAK IRQ */ |
785 | lp->hw.intmask(dev, 0); |
786 | lp->intmask |= TXFREEflag | EXCNAKflag; |
787 | lp->hw.intmask(dev, lp->intmask); |
788 | |
789 | spin_unlock_irqrestore(&lp->lock, flags); |
790 | |
791 | if (time_after(jiffies, lp->last_timeout + 10 * HZ)) { |
792 | arc_printk(D_EXTRA, dev, "tx timed out%s (status=%Xh, intmask=%Xh, dest=%02Xh)\n" , |
793 | msg, status, lp->intmask, lp->lasttrans_dest); |
794 | lp->last_timeout = jiffies; |
795 | } |
796 | |
797 | if (lp->cur_tx == -1) |
798 | netif_wake_queue(dev); |
799 | } |
800 | EXPORT_SYMBOL(arcnet_timeout); |
801 | |
802 | /* The typical workload of the driver: Handle the network interface |
803 | * interrupts. Establish which device needs attention, and call the correct |
804 | * chipset interrupt handler. |
805 | */ |
806 | irqreturn_t arcnet_interrupt(int irq, void *dev_id) |
807 | { |
808 | struct net_device *dev = dev_id; |
809 | struct arcnet_local *lp; |
810 | int recbuf, status, diagstatus, didsomething, boguscount; |
811 | unsigned long flags; |
812 | int retval = IRQ_NONE; |
813 | |
814 | arc_printk(D_DURING, dev, "\n" ); |
815 | |
816 | arc_printk(D_DURING, dev, "in arcnet_interrupt\n" ); |
817 | |
818 | lp = netdev_priv(dev); |
819 | BUG_ON(!lp); |
820 | |
821 | spin_lock_irqsave(&lp->lock, flags); |
822 | |
823 | /* RESET flag was enabled - if device is not running, we must |
824 | * clear it right away (but nothing else). |
825 | */ |
826 | if (!netif_running(dev)) { |
827 | if (lp->hw.status(dev) & RESETflag) |
828 | lp->hw.command(dev, CFLAGScmd | RESETclear); |
829 | lp->hw.intmask(dev, 0); |
830 | spin_unlock_irqrestore(&lp->lock, flags); |
831 | return retval; |
832 | } |
833 | |
834 | arc_printk(D_DURING, dev, "in arcnet_inthandler (status=%Xh, intmask=%Xh)\n" , |
835 | lp->hw.status(dev), lp->intmask); |
836 | |
837 | boguscount = 5; |
838 | do { |
839 | status = lp->hw.status(dev); |
840 | diagstatus = (status >> 8) & 0xFF; |
841 | |
842 | arc_printk(D_DEBUG, dev, "%s: %d: %s: status=%x\n" , |
843 | __FILE__, __LINE__, __func__, status); |
844 | didsomething = 0; |
845 | |
846 | /* RESET flag was enabled - card is resetting and if RX is |
847 | * disabled, it's NOT because we just got a packet. |
848 | * |
849 | * The card is in an undefined state. |
850 | * Clear it out and start over. |
851 | */ |
852 | if (status & RESETflag) { |
853 | arc_printk(D_NORMAL, dev, "spurious reset (status=%Xh)\n" , |
854 | status); |
855 | arcnet_close(dev); |
856 | arcnet_open(dev); |
857 | |
858 | /* get out of the interrupt handler! */ |
859 | break; |
860 | } |
861 | /* RX is inhibited - we must have received something. |
862 | * Prepare to receive into the next buffer. |
863 | * |
864 | * We don't actually copy the received packet from the card |
865 | * until after the transmit handler runs (and possibly |
866 | * launches the next tx); this should improve latency slightly |
867 | * if we get both types of interrupts at once. |
868 | */ |
869 | recbuf = -1; |
870 | if (status & lp->intmask & NORXflag) { |
871 | recbuf = lp->cur_rx; |
872 | arc_printk(D_DURING, dev, "Buffer #%d: receive irq (status=%Xh)\n" , |
873 | recbuf, status); |
874 | |
875 | lp->cur_rx = get_arcbuf(dev); |
876 | if (lp->cur_rx != -1) { |
877 | arc_printk(D_DURING, dev, "enabling receive to buffer #%d\n" , |
878 | lp->cur_rx); |
879 | lp->hw.command(dev, RXcmd | (lp->cur_rx << 3) | RXbcasts); |
880 | } |
881 | didsomething++; |
882 | } |
883 | |
884 | if ((diagstatus & EXCNAKflag)) { |
885 | arc_printk(D_DURING, dev, "EXCNAK IRQ (diagstat=%Xh)\n" , |
886 | diagstatus); |
887 | |
888 | lp->hw.command(dev, NOTXcmd); /* disable transmit */ |
889 | lp->excnak_pending = 1; |
890 | |
891 | lp->hw.command(dev, EXCNAKclear); |
892 | lp->intmask &= ~(EXCNAKflag); |
893 | didsomething++; |
894 | } |
895 | |
896 | /* a transmit finished, and we're interested in it. */ |
897 | if ((status & lp->intmask & TXFREEflag) || lp->timed_out) { |
898 | int ackstatus; |
899 | lp->intmask &= ~(TXFREEflag | EXCNAKflag); |
900 | |
901 | if (status & TXACKflag) |
902 | ackstatus = 2; |
903 | else if (lp->excnak_pending) |
904 | ackstatus = 1; |
905 | else |
906 | ackstatus = 0; |
907 | |
908 | arc_printk(D_DURING, dev, "TX IRQ (stat=%Xh)\n" , |
909 | status); |
910 | |
911 | if (lp->cur_tx != -1 && !lp->timed_out) { |
912 | if (!(status & TXACKflag)) { |
913 | if (lp->lasttrans_dest != 0) { |
914 | arc_printk(D_EXTRA, dev, |
915 | "transmit was not acknowledged! (status=%Xh, dest=%02Xh)\n" , |
916 | status, |
917 | lp->lasttrans_dest); |
918 | dev->stats.tx_errors++; |
919 | dev->stats.tx_carrier_errors++; |
920 | } else { |
921 | arc_printk(D_DURING, dev, |
922 | "broadcast was not acknowledged; that's normal (status=%Xh, dest=%02Xh)\n" , |
923 | status, |
924 | lp->lasttrans_dest); |
925 | } |
926 | } |
927 | |
928 | if (lp->outgoing.proto && |
929 | lp->outgoing.proto->ack_tx) { |
930 | lp->outgoing.proto |
931 | ->ack_tx(dev, ackstatus); |
932 | } |
933 | lp->reply_status = ackstatus; |
934 | tasklet_hi_schedule(&lp->reply_tasklet); |
935 | } |
936 | if (lp->cur_tx != -1) |
937 | release_arcbuf(dev, lp->cur_tx); |
938 | |
939 | lp->cur_tx = -1; |
940 | lp->timed_out = 0; |
941 | didsomething++; |
942 | |
943 | /* send another packet if there is one */ |
944 | go_tx(dev); |
945 | |
946 | /* continue a split packet, if any */ |
947 | if (lp->outgoing.proto && |
948 | lp->outgoing.proto->continue_tx) { |
949 | int txbuf = get_arcbuf(dev); |
950 | |
951 | if (txbuf != -1) { |
952 | if (lp->outgoing.proto->continue_tx(dev, txbuf)) { |
953 | /* that was the last segment */ |
954 | dev->stats.tx_bytes += lp->outgoing.skb->len; |
955 | if (!lp->outgoing.proto->ack_tx) { |
956 | dev_kfree_skb_irq(lp->outgoing.skb); |
957 | lp->outgoing.proto = NULL; |
958 | } |
959 | } |
960 | lp->next_tx = txbuf; |
961 | } |
962 | } |
963 | /* inform upper layers of idleness, if necessary */ |
964 | if (lp->cur_tx == -1) |
965 | netif_wake_queue(dev); |
966 | } |
967 | /* now process the received packet, if any */ |
968 | if (recbuf != -1) { |
969 | if (BUGLVL(D_RX)) |
970 | arcnet_dump_packet(dev, recbuf, "rx irq" , 0); |
971 | |
972 | arcnet_rx(dev, recbuf); |
973 | release_arcbuf(dev, recbuf); |
974 | |
975 | didsomething++; |
976 | } |
977 | if (status & lp->intmask & RECONflag) { |
978 | lp->hw.command(dev, CFLAGScmd | CONFIGclear); |
979 | dev->stats.tx_carrier_errors++; |
980 | |
981 | arc_printk(D_RECON, dev, "Network reconfiguration detected (status=%Xh)\n" , |
982 | status); |
983 | if (netif_carrier_ok(dev)) { |
984 | netif_carrier_off(dev); |
985 | netdev_info(dev, "link down\n" ); |
986 | } |
987 | mod_timer(&lp->timer, jiffies + msecs_to_jiffies(1000)); |
988 | |
989 | arcnet_led_event(dev, ARCNET_LED_EVENT_RECON); |
990 | /* MYRECON bit is at bit 7 of diagstatus */ |
991 | if (diagstatus & 0x80) |
992 | arc_printk(D_RECON, dev, "Put out that recon myself\n" ); |
993 | |
994 | /* is the RECON info empty or old? */ |
995 | if (!lp->first_recon || !lp->last_recon || |
996 | time_after(jiffies, lp->last_recon + HZ * 10)) { |
997 | if (lp->network_down) |
998 | arc_printk(D_NORMAL, dev, "reconfiguration detected: cabling restored?\n" ); |
999 | lp->first_recon = lp->last_recon = jiffies; |
1000 | lp->num_recons = lp->network_down = 0; |
1001 | |
1002 | arc_printk(D_DURING, dev, "recon: clearing counters.\n" ); |
1003 | } else { /* add to current RECON counter */ |
1004 | lp->last_recon = jiffies; |
1005 | lp->num_recons++; |
1006 | |
1007 | arc_printk(D_DURING, dev, "recon: counter=%d, time=%lds, net=%d\n" , |
1008 | lp->num_recons, |
1009 | (lp->last_recon - lp->first_recon) / HZ, |
1010 | lp->network_down); |
1011 | |
1012 | /* if network is marked up; |
1013 | * and first_recon and last_recon are 60+ apart; |
1014 | * and the average no. of recons counted is |
1015 | * > RECON_THRESHOLD/min; |
1016 | * then print a warning message. |
1017 | */ |
1018 | if (!lp->network_down && |
1019 | (lp->last_recon - lp->first_recon) <= HZ * 60 && |
1020 | lp->num_recons >= RECON_THRESHOLD) { |
1021 | lp->network_down = 1; |
1022 | arc_printk(D_NORMAL, dev, "many reconfigurations detected: cabling problem?\n" ); |
1023 | } else if (!lp->network_down && |
1024 | lp->last_recon - lp->first_recon > HZ * 60) { |
1025 | /* reset counters if we've gone for |
1026 | * over a minute. |
1027 | */ |
1028 | lp->first_recon = lp->last_recon; |
1029 | lp->num_recons = 1; |
1030 | } |
1031 | } |
1032 | } else if (lp->network_down && |
1033 | time_after(jiffies, lp->last_recon + HZ * 10)) { |
1034 | if (lp->network_down) |
1035 | arc_printk(D_NORMAL, dev, "cabling restored?\n" ); |
1036 | lp->first_recon = lp->last_recon = 0; |
1037 | lp->num_recons = lp->network_down = 0; |
1038 | |
1039 | arc_printk(D_DURING, dev, "not recon: clearing counters anyway.\n" ); |
1040 | netif_carrier_on(dev); |
1041 | } |
1042 | |
1043 | if (didsomething) |
1044 | retval |= IRQ_HANDLED; |
1045 | } while (--boguscount && didsomething); |
1046 | |
1047 | arc_printk(D_DURING, dev, "arcnet_interrupt complete (status=%Xh, count=%d)\n" , |
1048 | lp->hw.status(dev), boguscount); |
1049 | arc_printk(D_DURING, dev, "\n" ); |
1050 | |
1051 | lp->hw.intmask(dev, 0); |
1052 | udelay(1); |
1053 | lp->hw.intmask(dev, lp->intmask); |
1054 | |
1055 | spin_unlock_irqrestore(&lp->lock, flags); |
1056 | return retval; |
1057 | } |
1058 | EXPORT_SYMBOL(arcnet_interrupt); |
1059 | |
1060 | /* This is a generic packet receiver that calls arcnet??_rx depending on the |
1061 | * protocol ID found. |
1062 | */ |
1063 | static void arcnet_rx(struct net_device *dev, int bufnum) |
1064 | { |
1065 | struct arcnet_local *lp = netdev_priv(dev); |
1066 | struct archdr pkt; |
1067 | struct arc_rfc1201 *soft; |
1068 | int length, ofs; |
1069 | |
1070 | soft = &pkt.soft.rfc1201; |
1071 | |
1072 | lp->hw.copy_from_card(dev, bufnum, 0, &pkt, ARC_HDR_SIZE); |
1073 | if (pkt.hard.offset[0]) { |
1074 | ofs = pkt.hard.offset[0]; |
1075 | length = 256 - ofs; |
1076 | } else { |
1077 | ofs = pkt.hard.offset[1]; |
1078 | length = 512 - ofs; |
1079 | } |
1080 | |
1081 | /* get the full header, if possible */ |
1082 | if (sizeof(pkt.soft) <= length) { |
1083 | lp->hw.copy_from_card(dev, bufnum, ofs, soft, sizeof(pkt.soft)); |
1084 | } else { |
1085 | memset(&pkt.soft, 0, sizeof(pkt.soft)); |
1086 | lp->hw.copy_from_card(dev, bufnum, ofs, soft, length); |
1087 | } |
1088 | |
1089 | arc_printk(D_DURING, dev, "Buffer #%d: received packet from %02Xh to %02Xh (%d+4 bytes)\n" , |
1090 | bufnum, pkt.hard.source, pkt.hard.dest, length); |
1091 | |
1092 | dev->stats.rx_packets++; |
1093 | dev->stats.rx_bytes += length + ARC_HDR_SIZE; |
1094 | |
1095 | /* call the right receiver for the protocol */ |
1096 | if (arc_proto_map[soft->proto]->is_ip) { |
1097 | if (BUGLVL(D_PROTO)) { |
1098 | struct ArcProto |
1099 | *oldp = arc_proto_map[lp->default_proto[pkt.hard.source]], |
1100 | *newp = arc_proto_map[soft->proto]; |
1101 | |
1102 | if (oldp != newp) { |
1103 | arc_printk(D_PROTO, dev, |
1104 | "got protocol %02Xh; encap for host %02Xh is now '%c' (was '%c')\n" , |
1105 | soft->proto, pkt.hard.source, |
1106 | newp->suffix, oldp->suffix); |
1107 | } |
1108 | } |
1109 | |
1110 | /* broadcasts will always be done with the last-used encap. */ |
1111 | lp->default_proto[0] = soft->proto; |
1112 | |
1113 | /* in striking contrast, the following isn't a hack. */ |
1114 | lp->default_proto[pkt.hard.source] = soft->proto; |
1115 | } |
1116 | /* call the protocol-specific receiver. */ |
1117 | arc_proto_map[soft->proto]->rx(dev, bufnum, &pkt, length); |
1118 | } |
1119 | |
1120 | static void null_rx(struct net_device *dev, int bufnum, |
1121 | struct archdr *pkthdr, int length) |
1122 | { |
1123 | arc_printk(D_PROTO, dev, |
1124 | "rx: don't know how to deal with proto %02Xh from host %02Xh.\n" , |
1125 | pkthdr->soft.rfc1201.proto, pkthdr->hard.source); |
1126 | } |
1127 | |
1128 | static int (struct sk_buff *skb, struct net_device *dev, |
1129 | unsigned short type, uint8_t daddr) |
1130 | { |
1131 | struct arcnet_local *lp = netdev_priv(dev); |
1132 | |
1133 | arc_printk(D_PROTO, dev, |
1134 | "tx: can't build header for encap %02Xh; load a protocol driver.\n" , |
1135 | lp->default_proto[daddr]); |
1136 | |
1137 | /* always fails */ |
1138 | return 0; |
1139 | } |
1140 | |
1141 | /* the "do nothing" prepare_tx function warns that there's nothing to do. */ |
1142 | static int null_prepare_tx(struct net_device *dev, struct archdr *pkt, |
1143 | int length, int bufnum) |
1144 | { |
1145 | struct arcnet_local *lp = netdev_priv(dev); |
1146 | struct arc_hardware newpkt; |
1147 | |
1148 | arc_printk(D_PROTO, dev, "tx: no encap for this host; load a protocol driver.\n" ); |
1149 | |
1150 | /* send a packet to myself -- will never get received, of course */ |
1151 | newpkt.source = newpkt.dest = dev->dev_addr[0]; |
1152 | |
1153 | /* only one byte of actual data (and it's random) */ |
1154 | newpkt.offset[0] = 0xFF; |
1155 | |
1156 | lp->hw.copy_to_card(dev, bufnum, 0, &newpkt, ARC_HDR_SIZE); |
1157 | |
1158 | return 1; /* done */ |
1159 | } |
1160 | |