Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * Linux ARCnet driver - device-independent routines | |
cb334648 | 3 | * |
1da177e4 LT |
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 | * ********************** | |
cb334648 | 23 | * |
1da177e4 LT |
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. | |
cb334648 | 28 | * - arcnet.c v0.00 dated 1/1/94 and apparently by |
1da177e4 LT |
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 | */ | |
cb334648 JP |
72 | struct ArcProto *arc_proto_map[256], *arc_proto_default, |
73 | *arc_bcast_proto, *arc_raw_proto; | |
1da177e4 | 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", | |
cb334648 JP |
139 | sizeof(struct arc_hardware), sizeof(struct arc_rfc1201), |
140 | sizeof(struct arc_rfc1051), sizeof(struct arc_eth_encap), | |
1da177e4 LT |
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 | ||
1da177e4 LT |
171 | /* |
172 | * Dump the contents of an ARCnet buffer | |
173 | */ | |
174 | #if (ARCNET_DEBUG_MAX & (D_RX | D_TX)) | |
f03aa2d8 AB |
175 | static void arcnet_dump_packet(struct net_device *dev, int bufnum, |
176 | char *desc, int take_arcnet_lock) | |
1da177e4 | 177 | { |
454d7c9b | 178 | struct arcnet_local *lp = netdev_priv(dev); |
1da177e4 LT |
179 | int i, length; |
180 | unsigned long flags = 0; | |
181 | static uint8_t buf[512]; | |
ad361c98 | 182 | char hdr[32]; |
1da177e4 LT |
183 | |
184 | /* hw.copy_from_card expects IRQ context so take the IRQ lock | |
185 | to keep it single threaded */ | |
cb334648 | 186 | if (take_arcnet_lock) |
1da177e4 LT |
187 | spin_lock_irqsave(&lp->lock, flags); |
188 | ||
189 | lp->hw.copy_from_card(dev, bufnum, 0, buf, 512); | |
cb334648 | 190 | if (take_arcnet_lock) |
1da177e4 LT |
191 | spin_unlock_irqrestore(&lp->lock, flags); |
192 | ||
193 | /* if the offset[0] byte is nonzero, this is a 256-byte packet */ | |
194 | length = (buf[2] ? 256 : 512); | |
195 | ||
ad361c98 JP |
196 | /* dump the packet */ |
197 | snprintf(hdr, sizeof(hdr), "%6s:%s packet dump:", dev->name, desc); | |
198 | print_hex_dump(KERN_DEBUG, hdr, DUMP_PREFIX_OFFSET, | |
199 | 16, 1, buf, length, true); | |
1da177e4 LT |
200 | } |
201 | ||
f03aa2d8 AB |
202 | #else |
203 | ||
cb334648 | 204 | #define arcnet_dump_packet(dev, bufnum, desc, take_arcnet_lock) do { } while (0) |
f03aa2d8 | 205 | |
1da177e4 LT |
206 | #endif |
207 | ||
1da177e4 LT |
208 | /* |
209 | * Unregister a protocol driver from the arc_proto_map. Protocol drivers | |
210 | * are responsible for registering themselves, but the unregister routine | |
211 | * is pretty generic so we'll do it here. | |
212 | */ | |
213 | void arcnet_unregister_proto(struct ArcProto *proto) | |
214 | { | |
215 | int count; | |
216 | ||
217 | if (arc_proto_default == proto) | |
218 | arc_proto_default = &arc_proto_null; | |
219 | if (arc_bcast_proto == proto) | |
220 | arc_bcast_proto = arc_proto_default; | |
221 | if (arc_raw_proto == proto) | |
222 | arc_raw_proto = arc_proto_default; | |
223 | ||
224 | for (count = 0; count < 256; count++) { | |
225 | if (arc_proto_map[count] == proto) | |
226 | arc_proto_map[count] = arc_proto_default; | |
227 | } | |
228 | } | |
229 | ||
1da177e4 LT |
230 | /* |
231 | * Add a buffer to the queue. Only the interrupt handler is allowed to do | |
232 | * this, unless interrupts are disabled. | |
cb334648 | 233 | * |
1da177e4 LT |
234 | * Note: we don't check for a full queue, since there aren't enough buffers |
235 | * to more than fill it. | |
236 | */ | |
237 | static void release_arcbuf(struct net_device *dev, int bufnum) | |
238 | { | |
454d7c9b | 239 | struct arcnet_local *lp = netdev_priv(dev); |
1da177e4 LT |
240 | int i; |
241 | ||
242 | lp->buf_queue[lp->first_free_buf++] = bufnum; | |
243 | lp->first_free_buf %= 5; | |
244 | ||
245 | BUGLVL(D_DURING) { | |
246 | BUGMSG(D_DURING, "release_arcbuf: freed #%d; buffer queue is now: ", | |
247 | bufnum); | |
cb334648 | 248 | for (i = lp->next_buf; i != lp->first_free_buf; i = (i + 1) % 5) |
1da177e4 LT |
249 | BUGMSG2(D_DURING, "#%d ", lp->buf_queue[i]); |
250 | BUGMSG2(D_DURING, "\n"); | |
251 | } | |
252 | } | |
253 | ||
1da177e4 LT |
254 | /* |
255 | * Get a buffer from the queue. If this returns -1, there are no buffers | |
256 | * available. | |
257 | */ | |
258 | static int get_arcbuf(struct net_device *dev) | |
259 | { | |
454d7c9b | 260 | struct arcnet_local *lp = netdev_priv(dev); |
1da177e4 LT |
261 | int buf = -1, i; |
262 | ||
263 | if (!atomic_dec_and_test(&lp->buf_lock)) { | |
264 | /* already in this function */ | |
265 | BUGMSG(D_NORMAL, "get_arcbuf: overlap (%d)!\n", | |
266 | lp->buf_lock.counter); | |
267 | } | |
268 | else { /* we can continue */ | |
269 | if (lp->next_buf >= 5) | |
270 | lp->next_buf -= 5; | |
271 | ||
272 | if (lp->next_buf == lp->first_free_buf) | |
273 | BUGMSG(D_NORMAL, "get_arcbuf: BUG: no buffers are available??\n"); | |
274 | else { | |
275 | buf = lp->buf_queue[lp->next_buf++]; | |
276 | lp->next_buf %= 5; | |
277 | } | |
278 | } | |
279 | ||
1da177e4 LT |
280 | BUGLVL(D_DURING) { |
281 | BUGMSG(D_DURING, "get_arcbuf: got #%d; buffer queue is now: ", buf); | |
cb334648 | 282 | for (i = lp->next_buf; i != lp->first_free_buf; i = (i + 1) % 5) |
1da177e4 LT |
283 | BUGMSG2(D_DURING, "#%d ", lp->buf_queue[i]); |
284 | BUGMSG2(D_DURING, "\n"); | |
285 | } | |
286 | ||
287 | atomic_inc(&lp->buf_lock); | |
288 | return buf; | |
289 | } | |
290 | ||
1da177e4 LT |
291 | static int choose_mtu(void) |
292 | { | |
293 | int count, mtu = 65535; | |
294 | ||
295 | /* choose the smallest MTU of all available encaps */ | |
296 | for (count = 0; count < 256; count++) { | |
8e95a202 JP |
297 | if (arc_proto_map[count] != &arc_proto_null && |
298 | arc_proto_map[count]->mtu < mtu) { | |
1da177e4 LT |
299 | mtu = arc_proto_map[count]->mtu; |
300 | } | |
301 | } | |
302 | ||
303 | return mtu == 65535 ? XMTU : mtu; | |
304 | } | |
305 | ||
3b04ddde SH |
306 | static const struct header_ops arcnet_header_ops = { |
307 | .create = arcnet_header, | |
3b04ddde SH |
308 | }; |
309 | ||
bca5b893 SH |
310 | static const struct net_device_ops arcnet_netdev_ops = { |
311 | .ndo_open = arcnet_open, | |
312 | .ndo_stop = arcnet_close, | |
313 | .ndo_start_xmit = arcnet_send_packet, | |
314 | .ndo_tx_timeout = arcnet_timeout, | |
315 | }; | |
1da177e4 LT |
316 | |
317 | /* Setup a struct device for ARCnet. */ | |
318 | static void arcdev_setup(struct net_device *dev) | |
319 | { | |
320 | dev->type = ARPHRD_ARCNET; | |
bca5b893 | 321 | dev->netdev_ops = &arcnet_netdev_ops; |
3b04ddde | 322 | dev->header_ops = &arcnet_header_ops; |
1da177e4 LT |
323 | dev->hard_header_len = sizeof(struct archdr); |
324 | dev->mtu = choose_mtu(); | |
325 | ||
326 | dev->addr_len = ARCNET_ALEN; | |
327 | dev->tx_queue_len = 100; | |
328 | dev->broadcast[0] = 0x00; /* for us, broadcasts are address 0 */ | |
329 | dev->watchdog_timeo = TX_TIMEOUT; | |
330 | ||
331 | /* New-style flags. */ | |
332 | dev->flags = IFF_BROADCAST; | |
333 | ||
1da177e4 LT |
334 | } |
335 | ||
bca5b893 | 336 | struct net_device *alloc_arcdev(const char *name) |
1da177e4 LT |
337 | { |
338 | struct net_device *dev; | |
339 | ||
340 | dev = alloc_netdev(sizeof(struct arcnet_local), | |
c835a677 TG |
341 | name && *name ? name : "arc%d", NET_NAME_UNKNOWN, |
342 | arcdev_setup); | |
cb334648 | 343 | if (dev) { |
454d7c9b | 344 | struct arcnet_local *lp = netdev_priv(dev); |
01a1d5ac | 345 | |
1da177e4 LT |
346 | spin_lock_init(&lp->lock); |
347 | } | |
348 | ||
349 | return dev; | |
350 | } | |
351 | ||
352 | /* | |
353 | * Open/initialize the board. This is called sometime after booting when | |
354 | * the 'ifconfig' program is run. | |
355 | * | |
356 | * This routine should set everything up anew at each open, even registers | |
357 | * that "should" only need to be set once at boot, so that there is | |
358 | * non-reboot way to recover if something goes wrong. | |
359 | */ | |
bca5b893 | 360 | int arcnet_open(struct net_device *dev) |
1da177e4 | 361 | { |
454d7c9b | 362 | struct arcnet_local *lp = netdev_priv(dev); |
1da177e4 LT |
363 | int count, newmtu, error; |
364 | ||
cb334648 | 365 | BUGMSG(D_INIT, "opened."); |
1da177e4 LT |
366 | |
367 | if (!try_module_get(lp->hw.owner)) | |
368 | return -ENODEV; | |
369 | ||
370 | BUGLVL(D_PROTO) { | |
1da177e4 LT |
371 | BUGMSG(D_PROTO, "protocol map (default is '%c'): ", |
372 | arc_proto_default->suffix); | |
373 | for (count = 0; count < 256; count++) | |
374 | BUGMSG2(D_PROTO, "%c", arc_proto_map[count]->suffix); | |
375 | BUGMSG2(D_PROTO, "\n"); | |
376 | } | |
377 | ||
1da177e4 LT |
378 | BUGMSG(D_INIT, "arcnet_open: resetting card.\n"); |
379 | ||
380 | /* try to put the card in a defined state - if it fails the first | |
381 | * time, actually reset it. | |
382 | */ | |
383 | error = -ENODEV; | |
384 | if (ARCRESET(0) && ARCRESET(1)) | |
385 | goto out_module_put; | |
386 | ||
387 | newmtu = choose_mtu(); | |
388 | if (newmtu < dev->mtu) | |
389 | dev->mtu = newmtu; | |
390 | ||
391 | BUGMSG(D_INIT, "arcnet_open: mtu: %d.\n", dev->mtu); | |
392 | ||
393 | /* autodetect the encapsulation for each host. */ | |
394 | memset(lp->default_proto, 0, sizeof(lp->default_proto)); | |
395 | ||
396 | /* the broadcast address is special - use the 'bcast' protocol */ | |
397 | for (count = 0; count < 256; count++) { | |
398 | if (arc_proto_map[count] == arc_bcast_proto) { | |
399 | lp->default_proto[0] = count; | |
400 | break; | |
401 | } | |
402 | } | |
403 | ||
404 | /* initialize buffers */ | |
405 | atomic_set(&lp->buf_lock, 1); | |
406 | ||
407 | lp->next_buf = lp->first_free_buf = 0; | |
408 | release_arcbuf(dev, 0); | |
409 | release_arcbuf(dev, 1); | |
410 | release_arcbuf(dev, 2); | |
411 | release_arcbuf(dev, 3); | |
412 | lp->cur_tx = lp->next_tx = -1; | |
413 | lp->cur_rx = -1; | |
414 | ||
415 | lp->rfc1201.sequence = 1; | |
416 | ||
417 | /* bring up the hardware driver */ | |
418 | if (lp->hw.open) | |
419 | lp->hw.open(dev); | |
420 | ||
421 | if (dev->dev_addr[0] == 0) | |
422 | BUGMSG(D_NORMAL, "WARNING! Station address 00 is reserved " | |
423 | "for broadcasts!\n"); | |
424 | else if (dev->dev_addr[0] == 255) | |
425 | BUGMSG(D_NORMAL, "WARNING! Station address FF may confuse " | |
426 | "DOS networking programs!\n"); | |
427 | ||
cb334648 | 428 | BUGMSG(D_DEBUG, "%s: %d: %s\n", __FILE__, __LINE__, __func__); |
1da177e4 | 429 | if (ASTATUS() & RESETflag) { |
cb334648 | 430 | BUGMSG(D_DEBUG, "%s: %d: %s\n", __FILE__, __LINE__, __func__); |
1da177e4 LT |
431 | ACOMMAND(CFLAGScmd | RESETclear); |
432 | } | |
433 | ||
cb334648 | 434 | BUGMSG(D_DEBUG, "%s: %d: %s\n", __FILE__, __LINE__, __func__); |
1da177e4 LT |
435 | /* make sure we're ready to receive IRQ's. */ |
436 | AINTMASK(0); | |
437 | udelay(1); /* give it time to set the mask before | |
438 | * we reset it again. (may not even be | |
439 | * necessary) | |
440 | */ | |
cb334648 | 441 | BUGMSG(D_DEBUG, "%s: %d: %s\n", __FILE__, __LINE__, __func__); |
1da177e4 LT |
442 | lp->intmask = NORXflag | RECONflag; |
443 | AINTMASK(lp->intmask); | |
cb334648 | 444 | BUGMSG(D_DEBUG, "%s: %d: %s\n", __FILE__, __LINE__, __func__); |
1da177e4 LT |
445 | |
446 | netif_start_queue(dev); | |
447 | ||
448 | return 0; | |
449 | ||
450 | out_module_put: | |
451 | module_put(lp->hw.owner); | |
452 | return error; | |
453 | } | |
454 | ||
1da177e4 | 455 | /* The inverse routine to arcnet_open - shuts down the card. */ |
bca5b893 | 456 | int arcnet_close(struct net_device *dev) |
1da177e4 | 457 | { |
454d7c9b | 458 | struct arcnet_local *lp = netdev_priv(dev); |
1da177e4 LT |
459 | |
460 | netif_stop_queue(dev); | |
461 | ||
462 | /* flush TX and disable RX */ | |
463 | AINTMASK(0); | |
464 | ACOMMAND(NOTXcmd); /* stop transmit */ | |
465 | ACOMMAND(NORXcmd); /* disable receive */ | |
466 | mdelay(1); | |
467 | ||
468 | /* shut down the card */ | |
469 | lp->hw.close(dev); | |
470 | module_put(lp->hw.owner); | |
471 | return 0; | |
472 | } | |
473 | ||
1da177e4 | 474 | static int arcnet_header(struct sk_buff *skb, struct net_device *dev, |
3b04ddde SH |
475 | unsigned short type, const void *daddr, |
476 | const void *saddr, unsigned len) | |
1da177e4 | 477 | { |
3b04ddde | 478 | const struct arcnet_local *lp = netdev_priv(dev); |
1da177e4 LT |
479 | uint8_t _daddr, proto_num; |
480 | struct ArcProto *proto; | |
481 | ||
482 | BUGMSG(D_DURING, | |
cb334648 JP |
483 | "create header from %d to %d; protocol %d (%Xh); size %u.\n", |
484 | saddr ? *(uint8_t *)saddr : -1, | |
485 | daddr ? *(uint8_t *)daddr : -1, | |
1da177e4 LT |
486 | type, type, len); |
487 | ||
cb334648 | 488 | if (skb->len != 0 && len != skb->len) |
1da177e4 LT |
489 | BUGMSG(D_NORMAL, "arcnet_header: Yikes! skb->len(%d) != len(%d)!\n", |
490 | skb->len, len); | |
491 | ||
cb334648 JP |
492 | /* Type is host order - ? */ |
493 | if (type == ETH_P_ARCNET) { | |
494 | proto = arc_raw_proto; | |
495 | BUGMSG(D_DEBUG, "arc_raw_proto used. proto='%c'\n", proto->suffix); | |
496 | _daddr = daddr ? *(uint8_t *)daddr : 0; | |
497 | } | |
1da177e4 LT |
498 | else if (!daddr) { |
499 | /* | |
500 | * if the dest addr isn't provided, we can't choose an encapsulation! | |
501 | * Store the packet type (eg. ETH_P_IP) for now, and we'll push on a | |
502 | * real header when we do rebuild_header. | |
503 | */ | |
cb334648 | 504 | *(uint16_t *)skb_push(skb, 2) = type; |
b0e380b1 ACM |
505 | /* |
506 | * XXX: Why not use skb->mac_len? | |
507 | */ | |
508 | if (skb->network_header - skb->mac_header != 2) | |
1da177e4 | 509 | BUGMSG(D_NORMAL, "arcnet_header: Yikes! diff (%d) is not 2!\n", |
b0e380b1 | 510 | (int)(skb->network_header - skb->mac_header)); |
1da177e4 LT |
511 | return -2; /* return error -- can't transmit yet! */ |
512 | } | |
513 | else { | |
514 | /* otherwise, we can just add the header as usual. */ | |
cb334648 | 515 | _daddr = *(uint8_t *)daddr; |
1da177e4 LT |
516 | proto_num = lp->default_proto[_daddr]; |
517 | proto = arc_proto_map[proto_num]; | |
518 | BUGMSG(D_DURING, "building header for %02Xh using protocol '%c'\n", | |
519 | proto_num, proto->suffix); | |
520 | if (proto == &arc_proto_null && arc_bcast_proto != proto) { | |
521 | BUGMSG(D_DURING, "actually, let's use '%c' instead.\n", | |
522 | arc_bcast_proto->suffix); | |
523 | proto = arc_bcast_proto; | |
524 | } | |
525 | } | |
526 | return proto->build_header(skb, dev, type, _daddr); | |
527 | } | |
528 | ||
1da177e4 | 529 | /* Called by the kernel in order to transmit a packet. */ |
61357325 | 530 | netdev_tx_t arcnet_send_packet(struct sk_buff *skb, |
cb334648 | 531 | struct net_device *dev) |
1da177e4 | 532 | { |
454d7c9b | 533 | struct arcnet_local *lp = netdev_priv(dev); |
1da177e4 LT |
534 | struct archdr *pkt; |
535 | struct arc_rfc1201 *soft; | |
536 | struct ArcProto *proto; | |
537 | int txbuf; | |
538 | unsigned long flags; | |
c6bb15a0 | 539 | int freeskb, retval; |
1da177e4 LT |
540 | |
541 | BUGMSG(D_DURING, | |
542 | "transmit requested (status=%Xh, txbufs=%d/%d, len=%d, protocol %x)\n", | |
cb334648 | 543 | ASTATUS(), lp->cur_tx, lp->next_tx, skb->len, skb->protocol); |
1da177e4 | 544 | |
cb334648 | 545 | pkt = (struct archdr *)skb->data; |
1da177e4 LT |
546 | soft = &pkt->soft.rfc1201; |
547 | proto = arc_proto_map[soft->proto]; | |
548 | ||
549 | BUGMSG(D_SKB_SIZE, "skb: transmitting %d bytes to %02X\n", | |
cb334648 | 550 | skb->len, pkt->hard.dest); |
1da177e4 LT |
551 | BUGLVL(D_SKB) arcnet_dump_skb(dev, skb, "tx"); |
552 | ||
553 | /* fits in one packet? */ | |
554 | if (skb->len - ARC_HDR_SIZE > XMTU && !proto->continue_tx) { | |
555 | BUGMSG(D_NORMAL, "fixme: packet too large: compensating badly!\n"); | |
556 | dev_kfree_skb(skb); | |
c6bb15a0 | 557 | return NETDEV_TX_OK; /* don't try again */ |
1da177e4 LT |
558 | } |
559 | ||
560 | /* We're busy transmitting a packet... */ | |
561 | netif_stop_queue(dev); | |
562 | ||
563 | spin_lock_irqsave(&lp->lock, flags); | |
564 | AINTMASK(0); | |
cb334648 | 565 | if (lp->next_tx == -1) |
c6bb15a0 PD |
566 | txbuf = get_arcbuf(dev); |
567 | else { | |
568 | txbuf = -1; | |
569 | } | |
1da177e4 LT |
570 | if (txbuf != -1) { |
571 | if (proto->prepare_tx(dev, pkt, skb->len, txbuf) && | |
572 | !proto->ack_tx) { | |
573 | /* done right away and we don't want to acknowledge | |
574 | the package later - forget about it now */ | |
5803c512 | 575 | dev->stats.tx_bytes += skb->len; |
1da177e4 LT |
576 | freeskb = 1; |
577 | } else { | |
578 | /* do it the 'split' way */ | |
579 | lp->outgoing.proto = proto; | |
580 | lp->outgoing.skb = skb; | |
581 | lp->outgoing.pkt = pkt; | |
582 | ||
c6bb15a0 PD |
583 | freeskb = 0; |
584 | ||
1da177e4 LT |
585 | if (proto->continue_tx && |
586 | proto->continue_tx(dev, txbuf)) { | |
cb334648 JP |
587 | BUGMSG(D_NORMAL, |
588 | "bug! continue_tx finished the first time! " | |
589 | "(proto='%c')\n", proto->suffix); | |
1da177e4 LT |
590 | } |
591 | } | |
c6bb15a0 | 592 | retval = NETDEV_TX_OK; |
1da177e4 LT |
593 | lp->next_tx = txbuf; |
594 | } else { | |
c6bb15a0 PD |
595 | retval = NETDEV_TX_BUSY; |
596 | freeskb = 0; | |
1da177e4 LT |
597 | } |
598 | ||
cb334648 | 599 | BUGMSG(D_DEBUG, "%s: %d: %s, status: %x\n", __FILE__, __LINE__, __func__, ASTATUS()); |
1da177e4 LT |
600 | /* make sure we didn't ignore a TX IRQ while we were in here */ |
601 | AINTMASK(0); | |
602 | ||
cb334648 JP |
603 | BUGMSG(D_DEBUG, "%s: %d: %s\n", __FILE__, __LINE__, __func__); |
604 | lp->intmask |= TXFREEflag | EXCNAKflag; | |
1da177e4 | 605 | AINTMASK(lp->intmask); |
cb334648 | 606 | BUGMSG(D_DEBUG, "%s: %d: %s, status: %x\n", __FILE__, __LINE__, __func__, ASTATUS()); |
1da177e4 LT |
607 | |
608 | spin_unlock_irqrestore(&lp->lock, flags); | |
609 | if (freeskb) { | |
610 | dev_kfree_skb(skb); | |
611 | } | |
c6bb15a0 | 612 | return retval; /* no need to try again */ |
1da177e4 LT |
613 | } |
614 | ||
1da177e4 LT |
615 | /* |
616 | * Actually start transmitting a packet that was loaded into a buffer | |
617 | * by prepare_tx. This should _only_ be called by the interrupt handler. | |
618 | */ | |
619 | static int go_tx(struct net_device *dev) | |
620 | { | |
454d7c9b | 621 | struct arcnet_local *lp = netdev_priv(dev); |
1da177e4 LT |
622 | |
623 | BUGMSG(D_DURING, "go_tx: status=%Xh, intmask=%Xh, next_tx=%d, cur_tx=%d\n", | |
624 | ASTATUS(), lp->intmask, lp->next_tx, lp->cur_tx); | |
625 | ||
626 | if (lp->cur_tx != -1 || lp->next_tx == -1) | |
627 | return 0; | |
628 | ||
629 | BUGLVL(D_TX) arcnet_dump_packet(dev, lp->next_tx, "go_tx", 0); | |
630 | ||
631 | lp->cur_tx = lp->next_tx; | |
632 | lp->next_tx = -1; | |
633 | ||
634 | /* start sending */ | |
635 | ACOMMAND(TXcmd | (lp->cur_tx << 3)); | |
636 | ||
5803c512 | 637 | dev->stats.tx_packets++; |
1da177e4 LT |
638 | lp->lasttrans_dest = lp->lastload_dest; |
639 | lp->lastload_dest = 0; | |
640 | lp->excnak_pending = 0; | |
cb334648 | 641 | lp->intmask |= TXFREEflag | EXCNAKflag; |
1da177e4 LT |
642 | |
643 | return 1; | |
644 | } | |
645 | ||
1da177e4 | 646 | /* Called by the kernel when transmit times out */ |
bca5b893 | 647 | void arcnet_timeout(struct net_device *dev) |
1da177e4 LT |
648 | { |
649 | unsigned long flags; | |
454d7c9b | 650 | struct arcnet_local *lp = netdev_priv(dev); |
1da177e4 LT |
651 | int status = ASTATUS(); |
652 | char *msg; | |
653 | ||
654 | spin_lock_irqsave(&lp->lock, flags); | |
655 | if (status & TXFREEflag) { /* transmit _DID_ finish */ | |
656 | msg = " - missed IRQ?"; | |
657 | } else { | |
658 | msg = ""; | |
5803c512 | 659 | dev->stats.tx_aborted_errors++; |
1da177e4 LT |
660 | lp->timed_out = 1; |
661 | ACOMMAND(NOTXcmd | (lp->cur_tx << 3)); | |
662 | } | |
5803c512 | 663 | dev->stats.tx_errors++; |
1da177e4 LT |
664 | |
665 | /* make sure we didn't miss a TX or a EXC NAK IRQ */ | |
666 | AINTMASK(0); | |
cb334648 | 667 | lp->intmask |= TXFREEflag | EXCNAKflag; |
1da177e4 | 668 | AINTMASK(lp->intmask); |
cb334648 | 669 | |
1da177e4 LT |
670 | spin_unlock_irqrestore(&lp->lock, flags); |
671 | ||
cb334648 | 672 | if (time_after(jiffies, lp->last_timeout + 10 * HZ)) { |
1da177e4 LT |
673 | BUGMSG(D_EXTRA, "tx timed out%s (status=%Xh, intmask=%Xh, dest=%02Xh)\n", |
674 | msg, status, lp->intmask, lp->lasttrans_dest); | |
675 | lp->last_timeout = jiffies; | |
676 | } | |
677 | ||
678 | if (lp->cur_tx == -1) | |
679 | netif_wake_queue(dev); | |
680 | } | |
681 | ||
1da177e4 LT |
682 | /* |
683 | * The typical workload of the driver: Handle the network interface | |
684 | * interrupts. Establish which device needs attention, and call the correct | |
685 | * chipset interrupt handler. | |
686 | */ | |
7d12e780 | 687 | irqreturn_t arcnet_interrupt(int irq, void *dev_id) |
1da177e4 LT |
688 | { |
689 | struct net_device *dev = dev_id; | |
690 | struct arcnet_local *lp; | |
691 | int recbuf, status, diagstatus, didsomething, boguscount; | |
692 | int retval = IRQ_NONE; | |
693 | ||
694 | BUGMSG(D_DURING, "\n"); | |
695 | ||
696 | BUGMSG(D_DURING, "in arcnet_interrupt\n"); | |
454d7c9b WC |
697 | |
698 | lp = netdev_priv(dev); | |
5d9428de | 699 | BUG_ON(!lp); |
cb334648 | 700 | |
1da177e4 LT |
701 | spin_lock(&lp->lock); |
702 | ||
703 | /* | |
704 | * RESET flag was enabled - if device is not running, we must clear it right | |
705 | * away (but nothing else). | |
706 | */ | |
707 | if (!netif_running(dev)) { | |
708 | if (ASTATUS() & RESETflag) | |
709 | ACOMMAND(CFLAGScmd | RESETclear); | |
710 | AINTMASK(0); | |
711 | spin_unlock(&lp->lock); | |
226ee675 | 712 | return retval; |
1da177e4 LT |
713 | } |
714 | ||
715 | BUGMSG(D_DURING, "in arcnet_inthandler (status=%Xh, intmask=%Xh)\n", | |
716 | ASTATUS(), lp->intmask); | |
717 | ||
718 | boguscount = 5; | |
719 | do { | |
720 | status = ASTATUS(); | |
cb334648 | 721 | diagstatus = (status >> 8) & 0xFF; |
1da177e4 LT |
722 | |
723 | BUGMSG(D_DEBUG, "%s: %d: %s: status=%x\n", | |
cb334648 | 724 | __FILE__, __LINE__, __func__, status); |
1da177e4 LT |
725 | didsomething = 0; |
726 | ||
727 | /* | |
728 | * RESET flag was enabled - card is resetting and if RX is | |
729 | * disabled, it's NOT because we just got a packet. | |
cb334648 | 730 | * |
1da177e4 LT |
731 | * The card is in an undefined state. Clear it out and start over. |
732 | */ | |
733 | if (status & RESETflag) { | |
734 | BUGMSG(D_NORMAL, "spurious reset (status=%Xh)\n", status); | |
735 | arcnet_close(dev); | |
736 | arcnet_open(dev); | |
737 | ||
738 | /* get out of the interrupt handler! */ | |
739 | break; | |
740 | } | |
cb334648 | 741 | /* |
1da177e4 LT |
742 | * RX is inhibited - we must have received something. Prepare to |
743 | * receive into the next buffer. | |
cb334648 | 744 | * |
1da177e4 LT |
745 | * We don't actually copy the received packet from the card until |
746 | * after the transmit handler runs (and possibly launches the next | |
747 | * tx); this should improve latency slightly if we get both types | |
cb334648 | 748 | * of interrupts at once. |
1da177e4 LT |
749 | */ |
750 | recbuf = -1; | |
751 | if (status & lp->intmask & NORXflag) { | |
752 | recbuf = lp->cur_rx; | |
753 | BUGMSG(D_DURING, "Buffer #%d: receive irq (status=%Xh)\n", | |
754 | recbuf, status); | |
755 | ||
756 | lp->cur_rx = get_arcbuf(dev); | |
757 | if (lp->cur_rx != -1) { | |
758 | BUGMSG(D_DURING, "enabling receive to buffer #%d\n", | |
759 | lp->cur_rx); | |
760 | ACOMMAND(RXcmd | (lp->cur_rx << 3) | RXbcasts); | |
761 | } | |
762 | didsomething++; | |
763 | } | |
764 | ||
cb334648 | 765 | if ((diagstatus & EXCNAKflag)) { |
1da177e4 LT |
766 | BUGMSG(D_DURING, "EXCNAK IRQ (diagstat=%Xh)\n", |
767 | diagstatus); | |
768 | ||
cb334648 JP |
769 | ACOMMAND(NOTXcmd); /* disable transmit */ |
770 | lp->excnak_pending = 1; | |
1da177e4 | 771 | |
cb334648 | 772 | ACOMMAND(EXCNAKclear); |
1da177e4 | 773 | lp->intmask &= ~(EXCNAKflag); |
cb334648 JP |
774 | didsomething++; |
775 | } | |
1da177e4 | 776 | |
1da177e4 LT |
777 | /* a transmit finished, and we're interested in it. */ |
778 | if ((status & lp->intmask & TXFREEflag) || lp->timed_out) { | |
cb334648 | 779 | lp->intmask &= ~(TXFREEflag | EXCNAKflag); |
1da177e4 LT |
780 | |
781 | BUGMSG(D_DURING, "TX IRQ (stat=%Xh)\n", status); | |
782 | ||
783 | if (lp->cur_tx != -1 && !lp->timed_out) { | |
cb334648 | 784 | if (!(status & TXACKflag)) { |
1da177e4 LT |
785 | if (lp->lasttrans_dest != 0) { |
786 | BUGMSG(D_EXTRA, | |
787 | "transmit was not acknowledged! " | |
788 | "(status=%Xh, dest=%02Xh)\n", | |
789 | status, lp->lasttrans_dest); | |
5803c512 SH |
790 | dev->stats.tx_errors++; |
791 | dev->stats.tx_carrier_errors++; | |
1da177e4 LT |
792 | } else { |
793 | BUGMSG(D_DURING, | |
794 | "broadcast was not acknowledged; that's normal " | |
795 | "(status=%Xh, dest=%02Xh)\n", | |
796 | status, lp->lasttrans_dest); | |
797 | } | |
798 | } | |
799 | ||
800 | if (lp->outgoing.proto && | |
801 | lp->outgoing.proto->ack_tx) { | |
cb334648 | 802 | int ackstatus; |
01a1d5ac | 803 | |
cb334648 JP |
804 | if (status & TXACKflag) |
805 | ackstatus = 2; | |
806 | else if (lp->excnak_pending) | |
807 | ackstatus = 1; | |
808 | else | |
809 | ackstatus = 0; | |
810 | ||
811 | lp->outgoing.proto | |
812 | ->ack_tx(dev, ackstatus); | |
1da177e4 LT |
813 | } |
814 | } | |
815 | if (lp->cur_tx != -1) | |
816 | release_arcbuf(dev, lp->cur_tx); | |
817 | ||
818 | lp->cur_tx = -1; | |
819 | lp->timed_out = 0; | |
820 | didsomething++; | |
821 | ||
822 | /* send another packet if there is one */ | |
823 | go_tx(dev); | |
824 | ||
825 | /* continue a split packet, if any */ | |
826 | if (lp->outgoing.proto && lp->outgoing.proto->continue_tx) { | |
827 | int txbuf = get_arcbuf(dev); | |
01a1d5ac | 828 | |
1da177e4 LT |
829 | if (txbuf != -1) { |
830 | if (lp->outgoing.proto->continue_tx(dev, txbuf)) { | |
831 | /* that was the last segment */ | |
5803c512 | 832 | dev->stats.tx_bytes += lp->outgoing.skb->len; |
cb334648 JP |
833 | if (!lp->outgoing.proto->ack_tx) |
834 | { | |
835 | dev_kfree_skb_irq(lp->outgoing.skb); | |
836 | lp->outgoing.proto = NULL; | |
837 | } | |
1da177e4 LT |
838 | } |
839 | lp->next_tx = txbuf; | |
840 | } | |
841 | } | |
842 | /* inform upper layers of idleness, if necessary */ | |
843 | if (lp->cur_tx == -1) | |
844 | netif_wake_queue(dev); | |
845 | } | |
846 | /* now process the received packet, if any */ | |
847 | if (recbuf != -1) { | |
848 | BUGLVL(D_RX) arcnet_dump_packet(dev, recbuf, "rx irq", 0); | |
849 | ||
850 | arcnet_rx(dev, recbuf); | |
851 | release_arcbuf(dev, recbuf); | |
852 | ||
853 | didsomething++; | |
854 | } | |
855 | if (status & lp->intmask & RECONflag) { | |
856 | ACOMMAND(CFLAGScmd | CONFIGclear); | |
5803c512 | 857 | dev->stats.tx_carrier_errors++; |
1da177e4 LT |
858 | |
859 | BUGMSG(D_RECON, "Network reconfiguration detected (status=%Xh)\n", | |
860 | status); | |
c6bb15a0 | 861 | /* MYRECON bit is at bit 7 of diagstatus */ |
cb334648 JP |
862 | if (diagstatus & 0x80) |
863 | BUGMSG(D_RECON, "Put out that recon myself\n"); | |
1da177e4 LT |
864 | |
865 | /* is the RECON info empty or old? */ | |
866 | if (!lp->first_recon || !lp->last_recon || | |
9307b570 | 867 | time_after(jiffies, lp->last_recon + HZ * 10)) { |
1da177e4 LT |
868 | if (lp->network_down) |
869 | BUGMSG(D_NORMAL, "reconfiguration detected: cabling restored?\n"); | |
870 | lp->first_recon = lp->last_recon = jiffies; | |
871 | lp->num_recons = lp->network_down = 0; | |
872 | ||
873 | BUGMSG(D_DURING, "recon: clearing counters.\n"); | |
874 | } else { /* add to current RECON counter */ | |
875 | lp->last_recon = jiffies; | |
876 | lp->num_recons++; | |
877 | ||
878 | BUGMSG(D_DURING, "recon: counter=%d, time=%lds, net=%d\n", | |
879 | lp->num_recons, | |
cb334648 | 880 | (lp->last_recon - lp->first_recon) / HZ, |
1da177e4 LT |
881 | lp->network_down); |
882 | ||
883 | /* if network is marked up; | |
884 | * and first_recon and last_recon are 60+ apart; | |
885 | * and the average no. of recons counted is | |
886 | * > RECON_THRESHOLD/min; | |
887 | * then print a warning message. | |
888 | */ | |
8e95a202 JP |
889 | if (!lp->network_down && |
890 | (lp->last_recon - lp->first_recon) <= HZ * 60 && | |
891 | lp->num_recons >= RECON_THRESHOLD) { | |
1da177e4 LT |
892 | lp->network_down = 1; |
893 | BUGMSG(D_NORMAL, "many reconfigurations detected: cabling problem?\n"); | |
8e95a202 JP |
894 | } else if (!lp->network_down && |
895 | lp->last_recon - lp->first_recon > HZ * 60) { | |
1da177e4 LT |
896 | /* reset counters if we've gone for over a minute. */ |
897 | lp->first_recon = lp->last_recon; | |
898 | lp->num_recons = 1; | |
899 | } | |
900 | } | |
9307b570 | 901 | } else if (lp->network_down && |
cb334648 | 902 | time_after(jiffies, lp->last_recon + HZ * 10)) { |
1da177e4 LT |
903 | if (lp->network_down) |
904 | BUGMSG(D_NORMAL, "cabling restored?\n"); | |
905 | lp->first_recon = lp->last_recon = 0; | |
906 | lp->num_recons = lp->network_down = 0; | |
907 | ||
908 | BUGMSG(D_DURING, "not recon: clearing counters anyway.\n"); | |
909 | } | |
910 | ||
cb334648 | 911 | if (didsomething) { |
1da177e4 LT |
912 | retval |= IRQ_HANDLED; |
913 | } | |
914 | } | |
915 | while (--boguscount && didsomething); | |
916 | ||
917 | BUGMSG(D_DURING, "arcnet_interrupt complete (status=%Xh, count=%d)\n", | |
918 | ASTATUS(), boguscount); | |
919 | BUGMSG(D_DURING, "\n"); | |
920 | ||
1da177e4 LT |
921 | AINTMASK(0); |
922 | udelay(1); | |
923 | AINTMASK(lp->intmask); | |
cb334648 | 924 | |
1da177e4 LT |
925 | spin_unlock(&lp->lock); |
926 | return retval; | |
927 | } | |
928 | ||
1da177e4 LT |
929 | /* |
930 | * This is a generic packet receiver that calls arcnet??_rx depending on the | |
931 | * protocol ID found. | |
932 | */ | |
f03aa2d8 | 933 | static void arcnet_rx(struct net_device *dev, int bufnum) |
1da177e4 | 934 | { |
454d7c9b | 935 | struct arcnet_local *lp = netdev_priv(dev); |
1da177e4 LT |
936 | struct archdr pkt; |
937 | struct arc_rfc1201 *soft; | |
938 | int length, ofs; | |
939 | ||
940 | soft = &pkt.soft.rfc1201; | |
941 | ||
087d273c | 942 | lp->hw.copy_from_card(dev, bufnum, 0, &pkt, ARC_HDR_SIZE); |
1da177e4 LT |
943 | if (pkt.hard.offset[0]) { |
944 | ofs = pkt.hard.offset[0]; | |
945 | length = 256 - ofs; | |
946 | } else { | |
947 | ofs = pkt.hard.offset[1]; | |
948 | length = 512 - ofs; | |
949 | } | |
950 | ||
951 | /* get the full header, if possible */ | |
952 | if (sizeof(pkt.soft) <= length) | |
953 | lp->hw.copy_from_card(dev, bufnum, ofs, soft, sizeof(pkt.soft)); | |
954 | else { | |
955 | memset(&pkt.soft, 0, sizeof(pkt.soft)); | |
956 | lp->hw.copy_from_card(dev, bufnum, ofs, soft, length); | |
957 | } | |
958 | ||
959 | BUGMSG(D_DURING, "Buffer #%d: received packet from %02Xh to %02Xh " | |
960 | "(%d+4 bytes)\n", | |
961 | bufnum, pkt.hard.source, pkt.hard.dest, length); | |
962 | ||
5803c512 SH |
963 | dev->stats.rx_packets++; |
964 | dev->stats.rx_bytes += length + ARC_HDR_SIZE; | |
1da177e4 LT |
965 | |
966 | /* call the right receiver for the protocol */ | |
967 | if (arc_proto_map[soft->proto]->is_ip) { | |
968 | BUGLVL(D_PROTO) { | |
969 | struct ArcProto | |
970 | *oldp = arc_proto_map[lp->default_proto[pkt.hard.source]], | |
971 | *newp = arc_proto_map[soft->proto]; | |
972 | ||
973 | if (oldp != newp) { | |
974 | BUGMSG(D_PROTO, | |
975 | "got protocol %02Xh; encap for host %02Xh is now '%c'" | |
976 | " (was '%c')\n", soft->proto, pkt.hard.source, | |
977 | newp->suffix, oldp->suffix); | |
978 | } | |
979 | } | |
980 | ||
981 | /* broadcasts will always be done with the last-used encap. */ | |
982 | lp->default_proto[0] = soft->proto; | |
983 | ||
984 | /* in striking contrast, the following isn't a hack. */ | |
985 | lp->default_proto[pkt.hard.source] = soft->proto; | |
986 | } | |
987 | /* call the protocol-specific receiver. */ | |
988 | arc_proto_map[soft->proto]->rx(dev, bufnum, &pkt, length); | |
989 | } | |
990 | ||
1da177e4 LT |
991 | static void null_rx(struct net_device *dev, int bufnum, |
992 | struct archdr *pkthdr, int length) | |
993 | { | |
994 | BUGMSG(D_PROTO, | |
cb334648 | 995 | "rx: don't know how to deal with proto %02Xh from host %02Xh.\n", |
1da177e4 LT |
996 | pkthdr->soft.rfc1201.proto, pkthdr->hard.source); |
997 | } | |
998 | ||
1da177e4 LT |
999 | static int null_build_header(struct sk_buff *skb, struct net_device *dev, |
1000 | unsigned short type, uint8_t daddr) | |
1001 | { | |
454d7c9b | 1002 | struct arcnet_local *lp = netdev_priv(dev); |
1da177e4 LT |
1003 | |
1004 | BUGMSG(D_PROTO, | |
1005 | "tx: can't build header for encap %02Xh; load a protocol driver.\n", | |
1006 | lp->default_proto[daddr]); | |
1007 | ||
1008 | /* always fails */ | |
1009 | return 0; | |
1010 | } | |
1011 | ||
1da177e4 LT |
1012 | /* the "do nothing" prepare_tx function warns that there's nothing to do. */ |
1013 | static int null_prepare_tx(struct net_device *dev, struct archdr *pkt, | |
1014 | int length, int bufnum) | |
1015 | { | |
454d7c9b | 1016 | struct arcnet_local *lp = netdev_priv(dev); |
1da177e4 LT |
1017 | struct arc_hardware newpkt; |
1018 | ||
1019 | BUGMSG(D_PROTO, "tx: no encap for this host; load a protocol driver.\n"); | |
1020 | ||
1021 | /* send a packet to myself -- will never get received, of course */ | |
1022 | newpkt.source = newpkt.dest = dev->dev_addr[0]; | |
1023 | ||
1024 | /* only one byte of actual data (and it's random) */ | |
1025 | newpkt.offset[0] = 0xFF; | |
1026 | ||
1027 | lp->hw.copy_to_card(dev, bufnum, 0, &newpkt, ARC_HDR_SIZE); | |
1028 | ||
1029 | return 1; /* done */ | |
1030 | } |