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Commit | Line | Data |
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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 | ||
05a24b23 | 44 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
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> | |
ff5688ae | 53 | #include <linux/jiffies.h> |
1da177e4 | 54 | |
8890624a MG |
55 | #include <linux/leds.h> |
56 | ||
26c6d281 | 57 | #include "arcdevice.h" |
8e0f295e | 58 | #include "com9026.h" |
26c6d281 | 59 | |
1da177e4 LT |
60 | /* "do nothing" functions for protocol drivers */ |
61 | static void null_rx(struct net_device *dev, int bufnum, | |
62 | struct archdr *pkthdr, int length); | |
63 | static int null_build_header(struct sk_buff *skb, struct net_device *dev, | |
64 | unsigned short type, uint8_t daddr); | |
65 | static int null_prepare_tx(struct net_device *dev, struct archdr *pkt, | |
66 | int length, int bufnum); | |
67 | ||
f03aa2d8 | 68 | static void arcnet_rx(struct net_device *dev, int bufnum); |
1da177e4 | 69 | |
f2f0a16b | 70 | /* one ArcProto per possible proto ID. None of the elements of |
1da177e4 LT |
71 | * arc_proto_map are allowed to be NULL; they will get set to |
72 | * arc_proto_default instead. It also must not be NULL; if you would like | |
73 | * to set it to NULL, set it to &arc_proto_null instead. | |
74 | */ | |
811eafc0 JP |
75 | struct ArcProto *arc_proto_map[256]; |
76 | EXPORT_SYMBOL(arc_proto_map); | |
77 | ||
78 | struct ArcProto *arc_proto_default; | |
79 | EXPORT_SYMBOL(arc_proto_default); | |
80 | ||
81 | struct ArcProto *arc_bcast_proto; | |
82 | EXPORT_SYMBOL(arc_bcast_proto); | |
83 | ||
84 | struct ArcProto *arc_raw_proto; | |
85 | EXPORT_SYMBOL(arc_raw_proto); | |
1da177e4 | 86 | |
7f5e760c | 87 | static struct ArcProto arc_proto_null = { |
1da177e4 LT |
88 | .suffix = '?', |
89 | .mtu = XMTU, | |
90 | .is_ip = 0, | |
91 | .rx = null_rx, | |
92 | .build_header = null_build_header, | |
93 | .prepare_tx = null_prepare_tx, | |
94 | .continue_tx = NULL, | |
95 | .ack_tx = NULL | |
96 | }; | |
97 | ||
98 | /* Exported function prototypes */ | |
99 | int arcnet_debug = ARCNET_DEBUG; | |
1da177e4 | 100 | EXPORT_SYMBOL(arcnet_debug); |
1da177e4 LT |
101 | |
102 | /* Internal function prototypes */ | |
1da177e4 | 103 | static int arcnet_header(struct sk_buff *skb, struct net_device *dev, |
3b04ddde SH |
104 | unsigned short type, const void *daddr, |
105 | const void *saddr, unsigned len); | |
1da177e4 LT |
106 | static int go_tx(struct net_device *dev); |
107 | ||
108 | static int debug = ARCNET_DEBUG; | |
109 | module_param(debug, int, 0); | |
110 | MODULE_LICENSE("GPL"); | |
111 | ||
112 | static int __init arcnet_init(void) | |
113 | { | |
114 | int count; | |
115 | ||
116 | arcnet_debug = debug; | |
117 | ||
05a24b23 | 118 | pr_info("arcnet loaded\n"); |
1da177e4 LT |
119 | |
120 | /* initialize the protocol map */ | |
121 | arc_raw_proto = arc_proto_default = arc_bcast_proto = &arc_proto_null; | |
122 | for (count = 0; count < 256; count++) | |
123 | arc_proto_map[count] = arc_proto_default; | |
124 | ||
72aeea48 | 125 | if (BUGLVL(D_DURING)) |
05a24b23 JP |
126 | pr_info("struct sizes: %Zd %Zd %Zd %Zd %Zd\n", |
127 | sizeof(struct arc_hardware), | |
128 | sizeof(struct arc_rfc1201), | |
129 | sizeof(struct arc_rfc1051), | |
130 | sizeof(struct arc_eth_encap), | |
131 | sizeof(struct archdr)); | |
1da177e4 LT |
132 | |
133 | return 0; | |
134 | } | |
135 | ||
136 | static void __exit arcnet_exit(void) | |
137 | { | |
138 | } | |
139 | ||
140 | module_init(arcnet_init); | |
141 | module_exit(arcnet_exit); | |
142 | ||
f2f0a16b | 143 | /* Dump the contents of an sk_buff */ |
1da177e4 LT |
144 | #if ARCNET_DEBUG_MAX & D_SKB |
145 | void arcnet_dump_skb(struct net_device *dev, | |
146 | struct sk_buff *skb, char *desc) | |
147 | { | |
ad361c98 | 148 | char hdr[32]; |
1da177e4 | 149 | |
ad361c98 JP |
150 | /* dump the packet */ |
151 | snprintf(hdr, sizeof(hdr), "%6s:%s skb->data:", dev->name, desc); | |
152 | print_hex_dump(KERN_DEBUG, hdr, DUMP_PREFIX_OFFSET, | |
153 | 16, 1, skb->data, skb->len, true); | |
1da177e4 | 154 | } |
1da177e4 LT |
155 | EXPORT_SYMBOL(arcnet_dump_skb); |
156 | #endif | |
157 | ||
f2f0a16b | 158 | /* Dump the contents of an ARCnet buffer */ |
1da177e4 | 159 | #if (ARCNET_DEBUG_MAX & (D_RX | D_TX)) |
f03aa2d8 AB |
160 | static void arcnet_dump_packet(struct net_device *dev, int bufnum, |
161 | char *desc, int take_arcnet_lock) | |
1da177e4 | 162 | { |
454d7c9b | 163 | struct arcnet_local *lp = netdev_priv(dev); |
1da177e4 LT |
164 | int i, length; |
165 | unsigned long flags = 0; | |
166 | static uint8_t buf[512]; | |
ad361c98 | 167 | char hdr[32]; |
1da177e4 LT |
168 | |
169 | /* hw.copy_from_card expects IRQ context so take the IRQ lock | |
f2f0a16b JP |
170 | * to keep it single threaded |
171 | */ | |
cb334648 | 172 | if (take_arcnet_lock) |
1da177e4 LT |
173 | spin_lock_irqsave(&lp->lock, flags); |
174 | ||
175 | lp->hw.copy_from_card(dev, bufnum, 0, buf, 512); | |
cb334648 | 176 | if (take_arcnet_lock) |
1da177e4 LT |
177 | spin_unlock_irqrestore(&lp->lock, flags); |
178 | ||
179 | /* if the offset[0] byte is nonzero, this is a 256-byte packet */ | |
180 | length = (buf[2] ? 256 : 512); | |
181 | ||
ad361c98 JP |
182 | /* dump the packet */ |
183 | snprintf(hdr, sizeof(hdr), "%6s:%s packet dump:", dev->name, desc); | |
184 | print_hex_dump(KERN_DEBUG, hdr, DUMP_PREFIX_OFFSET, | |
185 | 16, 1, buf, length, true); | |
1da177e4 LT |
186 | } |
187 | ||
f03aa2d8 AB |
188 | #else |
189 | ||
cb334648 | 190 | #define arcnet_dump_packet(dev, bufnum, desc, take_arcnet_lock) do { } while (0) |
f03aa2d8 | 191 | |
1da177e4 LT |
192 | #endif |
193 | ||
8890624a MG |
194 | /* Trigger a LED event in response to a ARCNET device event */ |
195 | void arcnet_led_event(struct net_device *dev, enum arcnet_led_event event) | |
196 | { | |
197 | struct arcnet_local *lp = netdev_priv(dev); | |
198 | unsigned long led_delay = 350; | |
199 | unsigned long tx_delay = 50; | |
200 | ||
201 | switch (event) { | |
202 | case ARCNET_LED_EVENT_RECON: | |
203 | led_trigger_blink_oneshot(lp->recon_led_trig, | |
204 | &led_delay, &led_delay, 0); | |
205 | break; | |
206 | case ARCNET_LED_EVENT_OPEN: | |
207 | led_trigger_event(lp->tx_led_trig, LED_OFF); | |
208 | led_trigger_event(lp->recon_led_trig, LED_OFF); | |
209 | break; | |
210 | case ARCNET_LED_EVENT_STOP: | |
211 | led_trigger_event(lp->tx_led_trig, LED_OFF); | |
212 | led_trigger_event(lp->recon_led_trig, LED_OFF); | |
213 | break; | |
214 | case ARCNET_LED_EVENT_TX: | |
215 | led_trigger_blink_oneshot(lp->tx_led_trig, | |
216 | &tx_delay, &tx_delay, 0); | |
217 | break; | |
218 | } | |
219 | } | |
220 | EXPORT_SYMBOL_GPL(arcnet_led_event); | |
221 | ||
222 | static void arcnet_led_release(struct device *gendev, void *res) | |
223 | { | |
224 | struct arcnet_local *lp = netdev_priv(to_net_dev(gendev)); | |
225 | ||
226 | led_trigger_unregister_simple(lp->tx_led_trig); | |
227 | led_trigger_unregister_simple(lp->recon_led_trig); | |
228 | } | |
229 | ||
230 | /* Register ARCNET LED triggers for a arcnet device | |
231 | * | |
232 | * This is normally called from a driver's probe function | |
233 | */ | |
234 | void devm_arcnet_led_init(struct net_device *netdev, int index, int subid) | |
235 | { | |
236 | struct arcnet_local *lp = netdev_priv(netdev); | |
237 | void *res; | |
238 | ||
239 | res = devres_alloc(arcnet_led_release, 0, GFP_KERNEL); | |
240 | if (!res) { | |
241 | netdev_err(netdev, "cannot register LED triggers\n"); | |
242 | return; | |
243 | } | |
244 | ||
245 | snprintf(lp->tx_led_trig_name, sizeof(lp->tx_led_trig_name), | |
246 | "arc%d-%d-tx", index, subid); | |
247 | snprintf(lp->recon_led_trig_name, sizeof(lp->recon_led_trig_name), | |
248 | "arc%d-%d-recon", index, subid); | |
249 | ||
250 | led_trigger_register_simple(lp->tx_led_trig_name, | |
251 | &lp->tx_led_trig); | |
252 | led_trigger_register_simple(lp->recon_led_trig_name, | |
253 | &lp->recon_led_trig); | |
254 | ||
255 | devres_add(&netdev->dev, res); | |
256 | } | |
257 | EXPORT_SYMBOL_GPL(devm_arcnet_led_init); | |
258 | ||
f2f0a16b | 259 | /* Unregister a protocol driver from the arc_proto_map. Protocol drivers |
1da177e4 LT |
260 | * are responsible for registering themselves, but the unregister routine |
261 | * is pretty generic so we'll do it here. | |
262 | */ | |
263 | void arcnet_unregister_proto(struct ArcProto *proto) | |
264 | { | |
265 | int count; | |
266 | ||
267 | if (arc_proto_default == proto) | |
268 | arc_proto_default = &arc_proto_null; | |
269 | if (arc_bcast_proto == proto) | |
270 | arc_bcast_proto = arc_proto_default; | |
271 | if (arc_raw_proto == proto) | |
272 | arc_raw_proto = arc_proto_default; | |
273 | ||
274 | for (count = 0; count < 256; count++) { | |
275 | if (arc_proto_map[count] == proto) | |
276 | arc_proto_map[count] = arc_proto_default; | |
277 | } | |
278 | } | |
811eafc0 | 279 | EXPORT_SYMBOL(arcnet_unregister_proto); |
1da177e4 | 280 | |
f2f0a16b | 281 | /* Add a buffer to the queue. Only the interrupt handler is allowed to do |
1da177e4 | 282 | * this, unless interrupts are disabled. |
cb334648 | 283 | * |
1da177e4 LT |
284 | * Note: we don't check for a full queue, since there aren't enough buffers |
285 | * to more than fill it. | |
286 | */ | |
287 | static void release_arcbuf(struct net_device *dev, int bufnum) | |
288 | { | |
454d7c9b | 289 | struct arcnet_local *lp = netdev_priv(dev); |
1da177e4 LT |
290 | int i; |
291 | ||
292 | lp->buf_queue[lp->first_free_buf++] = bufnum; | |
293 | lp->first_free_buf %= 5; | |
294 | ||
72aeea48 | 295 | if (BUGLVL(D_DURING)) { |
a34c0932 JP |
296 | arc_printk(D_DURING, dev, "release_arcbuf: freed #%d; buffer queue is now: ", |
297 | bufnum); | |
cb334648 | 298 | for (i = lp->next_buf; i != lp->first_free_buf; i = (i + 1) % 5) |
a34c0932 JP |
299 | arc_cont(D_DURING, "#%d ", lp->buf_queue[i]); |
300 | arc_cont(D_DURING, "\n"); | |
1da177e4 LT |
301 | } |
302 | } | |
303 | ||
f2f0a16b JP |
304 | /* Get a buffer from the queue. |
305 | * If this returns -1, there are no buffers available. | |
1da177e4 LT |
306 | */ |
307 | static int get_arcbuf(struct net_device *dev) | |
308 | { | |
454d7c9b | 309 | struct arcnet_local *lp = netdev_priv(dev); |
1da177e4 LT |
310 | int buf = -1, i; |
311 | ||
312 | if (!atomic_dec_and_test(&lp->buf_lock)) { | |
313 | /* already in this function */ | |
a34c0932 JP |
314 | arc_printk(D_NORMAL, dev, "get_arcbuf: overlap (%d)!\n", |
315 | lp->buf_lock.counter); | |
7f5e760c | 316 | } else { /* we can continue */ |
1da177e4 LT |
317 | if (lp->next_buf >= 5) |
318 | lp->next_buf -= 5; | |
319 | ||
7f5e760c | 320 | if (lp->next_buf == lp->first_free_buf) { |
a34c0932 | 321 | arc_printk(D_NORMAL, dev, "get_arcbuf: BUG: no buffers are available??\n"); |
7f5e760c | 322 | } else { |
1da177e4 LT |
323 | buf = lp->buf_queue[lp->next_buf++]; |
324 | lp->next_buf %= 5; | |
325 | } | |
326 | } | |
327 | ||
72aeea48 | 328 | if (BUGLVL(D_DURING)) { |
a34c0932 JP |
329 | arc_printk(D_DURING, dev, "get_arcbuf: got #%d; buffer queue is now: ", |
330 | buf); | |
cb334648 | 331 | for (i = lp->next_buf; i != lp->first_free_buf; i = (i + 1) % 5) |
a34c0932 JP |
332 | arc_cont(D_DURING, "#%d ", lp->buf_queue[i]); |
333 | arc_cont(D_DURING, "\n"); | |
1da177e4 LT |
334 | } |
335 | ||
336 | atomic_inc(&lp->buf_lock); | |
337 | return buf; | |
338 | } | |
339 | ||
1da177e4 LT |
340 | static int choose_mtu(void) |
341 | { | |
342 | int count, mtu = 65535; | |
343 | ||
344 | /* choose the smallest MTU of all available encaps */ | |
345 | for (count = 0; count < 256; count++) { | |
8e95a202 JP |
346 | if (arc_proto_map[count] != &arc_proto_null && |
347 | arc_proto_map[count]->mtu < mtu) { | |
1da177e4 LT |
348 | mtu = arc_proto_map[count]->mtu; |
349 | } | |
350 | } | |
351 | ||
352 | return mtu == 65535 ? XMTU : mtu; | |
353 | } | |
354 | ||
3b04ddde SH |
355 | static const struct header_ops arcnet_header_ops = { |
356 | .create = arcnet_header, | |
3b04ddde SH |
357 | }; |
358 | ||
bca5b893 SH |
359 | static const struct net_device_ops arcnet_netdev_ops = { |
360 | .ndo_open = arcnet_open, | |
361 | .ndo_stop = arcnet_close, | |
362 | .ndo_start_xmit = arcnet_send_packet, | |
363 | .ndo_tx_timeout = arcnet_timeout, | |
364 | }; | |
1da177e4 LT |
365 | |
366 | /* Setup a struct device for ARCnet. */ | |
367 | static void arcdev_setup(struct net_device *dev) | |
368 | { | |
369 | dev->type = ARPHRD_ARCNET; | |
bca5b893 | 370 | dev->netdev_ops = &arcnet_netdev_ops; |
3b04ddde | 371 | dev->header_ops = &arcnet_header_ops; |
980137a2 | 372 | dev->hard_header_len = sizeof(struct arc_hardware); |
1da177e4 LT |
373 | dev->mtu = choose_mtu(); |
374 | ||
375 | dev->addr_len = ARCNET_ALEN; | |
376 | dev->tx_queue_len = 100; | |
377 | dev->broadcast[0] = 0x00; /* for us, broadcasts are address 0 */ | |
378 | dev->watchdog_timeo = TX_TIMEOUT; | |
379 | ||
380 | /* New-style flags. */ | |
381 | dev->flags = IFF_BROADCAST; | |
1da177e4 LT |
382 | } |
383 | ||
bca5b893 | 384 | struct net_device *alloc_arcdev(const char *name) |
1da177e4 LT |
385 | { |
386 | struct net_device *dev; | |
387 | ||
388 | dev = alloc_netdev(sizeof(struct arcnet_local), | |
c835a677 TG |
389 | name && *name ? name : "arc%d", NET_NAME_UNKNOWN, |
390 | arcdev_setup); | |
cb334648 | 391 | if (dev) { |
454d7c9b | 392 | struct arcnet_local *lp = netdev_priv(dev); |
01a1d5ac | 393 | |
1da177e4 LT |
394 | spin_lock_init(&lp->lock); |
395 | } | |
396 | ||
397 | return dev; | |
398 | } | |
811eafc0 | 399 | EXPORT_SYMBOL(alloc_arcdev); |
1da177e4 | 400 | |
f2f0a16b | 401 | /* Open/initialize the board. This is called sometime after booting when |
1da177e4 LT |
402 | * the 'ifconfig' program is run. |
403 | * | |
404 | * This routine should set everything up anew at each open, even registers | |
405 | * that "should" only need to be set once at boot, so that there is | |
406 | * non-reboot way to recover if something goes wrong. | |
407 | */ | |
bca5b893 | 408 | int arcnet_open(struct net_device *dev) |
1da177e4 | 409 | { |
454d7c9b | 410 | struct arcnet_local *lp = netdev_priv(dev); |
1da177e4 LT |
411 | int count, newmtu, error; |
412 | ||
a34c0932 | 413 | arc_printk(D_INIT, dev, "opened."); |
1da177e4 LT |
414 | |
415 | if (!try_module_get(lp->hw.owner)) | |
416 | return -ENODEV; | |
417 | ||
72aeea48 | 418 | if (BUGLVL(D_PROTO)) { |
a34c0932 JP |
419 | arc_printk(D_PROTO, dev, "protocol map (default is '%c'): ", |
420 | arc_proto_default->suffix); | |
1da177e4 | 421 | for (count = 0; count < 256; count++) |
a34c0932 JP |
422 | arc_cont(D_PROTO, "%c", arc_proto_map[count]->suffix); |
423 | arc_cont(D_PROTO, "\n"); | |
1da177e4 LT |
424 | } |
425 | ||
a34c0932 | 426 | arc_printk(D_INIT, dev, "arcnet_open: resetting card.\n"); |
1da177e4 LT |
427 | |
428 | /* try to put the card in a defined state - if it fails the first | |
429 | * time, actually reset it. | |
430 | */ | |
431 | error = -ENODEV; | |
e15b0362 | 432 | if (lp->hw.reset(dev, 0) && lp->hw.reset(dev, 1)) |
1da177e4 LT |
433 | goto out_module_put; |
434 | ||
435 | newmtu = choose_mtu(); | |
436 | if (newmtu < dev->mtu) | |
437 | dev->mtu = newmtu; | |
438 | ||
a34c0932 | 439 | arc_printk(D_INIT, dev, "arcnet_open: mtu: %d.\n", dev->mtu); |
1da177e4 LT |
440 | |
441 | /* autodetect the encapsulation for each host. */ | |
442 | memset(lp->default_proto, 0, sizeof(lp->default_proto)); | |
443 | ||
444 | /* the broadcast address is special - use the 'bcast' protocol */ | |
445 | for (count = 0; count < 256; count++) { | |
446 | if (arc_proto_map[count] == arc_bcast_proto) { | |
447 | lp->default_proto[0] = count; | |
448 | break; | |
449 | } | |
450 | } | |
451 | ||
452 | /* initialize buffers */ | |
453 | atomic_set(&lp->buf_lock, 1); | |
454 | ||
455 | lp->next_buf = lp->first_free_buf = 0; | |
456 | release_arcbuf(dev, 0); | |
457 | release_arcbuf(dev, 1); | |
458 | release_arcbuf(dev, 2); | |
459 | release_arcbuf(dev, 3); | |
460 | lp->cur_tx = lp->next_tx = -1; | |
461 | lp->cur_rx = -1; | |
462 | ||
463 | lp->rfc1201.sequence = 1; | |
464 | ||
465 | /* bring up the hardware driver */ | |
466 | if (lp->hw.open) | |
467 | lp->hw.open(dev); | |
468 | ||
469 | if (dev->dev_addr[0] == 0) | |
a34c0932 | 470 | arc_printk(D_NORMAL, dev, "WARNING! Station address 00 is reserved for broadcasts!\n"); |
1da177e4 | 471 | else if (dev->dev_addr[0] == 255) |
a34c0932 | 472 | arc_printk(D_NORMAL, dev, "WARNING! Station address FF may confuse DOS networking programs!\n"); |
1da177e4 | 473 | |
a34c0932 | 474 | arc_printk(D_DEBUG, dev, "%s: %d: %s\n", __FILE__, __LINE__, __func__); |
e15b0362 | 475 | if (lp->hw.status(dev) & RESETflag) { |
a34c0932 JP |
476 | arc_printk(D_DEBUG, dev, "%s: %d: %s\n", |
477 | __FILE__, __LINE__, __func__); | |
e15b0362 | 478 | lp->hw.command(dev, CFLAGScmd | RESETclear); |
1da177e4 LT |
479 | } |
480 | ||
a34c0932 | 481 | arc_printk(D_DEBUG, dev, "%s: %d: %s\n", __FILE__, __LINE__, __func__); |
1da177e4 | 482 | /* make sure we're ready to receive IRQ's. */ |
e15b0362 | 483 | lp->hw.intmask(dev, 0); |
1da177e4 LT |
484 | udelay(1); /* give it time to set the mask before |
485 | * we reset it again. (may not even be | |
486 | * necessary) | |
487 | */ | |
a34c0932 | 488 | arc_printk(D_DEBUG, dev, "%s: %d: %s\n", __FILE__, __LINE__, __func__); |
1da177e4 | 489 | lp->intmask = NORXflag | RECONflag; |
e15b0362 | 490 | lp->hw.intmask(dev, lp->intmask); |
a34c0932 | 491 | arc_printk(D_DEBUG, dev, "%s: %d: %s\n", __FILE__, __LINE__, __func__); |
1da177e4 LT |
492 | |
493 | netif_start_queue(dev); | |
494 | ||
8890624a | 495 | arcnet_led_event(dev, ARCNET_LED_EVENT_OPEN); |
1da177e4 LT |
496 | return 0; |
497 | ||
498 | out_module_put: | |
499 | module_put(lp->hw.owner); | |
500 | return error; | |
501 | } | |
811eafc0 | 502 | EXPORT_SYMBOL(arcnet_open); |
1da177e4 | 503 | |
1da177e4 | 504 | /* The inverse routine to arcnet_open - shuts down the card. */ |
bca5b893 | 505 | int arcnet_close(struct net_device *dev) |
1da177e4 | 506 | { |
454d7c9b | 507 | struct arcnet_local *lp = netdev_priv(dev); |
1da177e4 | 508 | |
8890624a | 509 | arcnet_led_event(dev, ARCNET_LED_EVENT_STOP); |
1da177e4 LT |
510 | netif_stop_queue(dev); |
511 | ||
512 | /* flush TX and disable RX */ | |
e15b0362 JP |
513 | lp->hw.intmask(dev, 0); |
514 | lp->hw.command(dev, NOTXcmd); /* stop transmit */ | |
515 | lp->hw.command(dev, NORXcmd); /* disable receive */ | |
1da177e4 LT |
516 | mdelay(1); |
517 | ||
518 | /* shut down the card */ | |
519 | lp->hw.close(dev); | |
520 | module_put(lp->hw.owner); | |
521 | return 0; | |
522 | } | |
811eafc0 | 523 | EXPORT_SYMBOL(arcnet_close); |
1da177e4 | 524 | |
1da177e4 | 525 | static int arcnet_header(struct sk_buff *skb, struct net_device *dev, |
3b04ddde SH |
526 | unsigned short type, const void *daddr, |
527 | const void *saddr, unsigned len) | |
1da177e4 | 528 | { |
3b04ddde | 529 | const struct arcnet_local *lp = netdev_priv(dev); |
1da177e4 LT |
530 | uint8_t _daddr, proto_num; |
531 | struct ArcProto *proto; | |
532 | ||
a34c0932 JP |
533 | arc_printk(D_DURING, dev, |
534 | "create header from %d to %d; protocol %d (%Xh); size %u.\n", | |
535 | saddr ? *(uint8_t *)saddr : -1, | |
536 | daddr ? *(uint8_t *)daddr : -1, | |
537 | type, type, len); | |
1da177e4 | 538 | |
cb334648 | 539 | if (skb->len != 0 && len != skb->len) |
a34c0932 JP |
540 | arc_printk(D_NORMAL, dev, "arcnet_header: Yikes! skb->len(%d) != len(%d)!\n", |
541 | skb->len, len); | |
1da177e4 | 542 | |
cb334648 JP |
543 | /* Type is host order - ? */ |
544 | if (type == ETH_P_ARCNET) { | |
545 | proto = arc_raw_proto; | |
a34c0932 JP |
546 | arc_printk(D_DEBUG, dev, "arc_raw_proto used. proto='%c'\n", |
547 | proto->suffix); | |
cb334648 | 548 | _daddr = daddr ? *(uint8_t *)daddr : 0; |
7f5e760c | 549 | } else if (!daddr) { |
f2f0a16b JP |
550 | /* if the dest addr isn't provided, we can't choose an |
551 | * encapsulation! Store the packet type (eg. ETH_P_IP) | |
552 | * for now, and we'll push on a real header when we do | |
553 | * rebuild_header. | |
1da177e4 | 554 | */ |
cb334648 | 555 | *(uint16_t *)skb_push(skb, 2) = type; |
f2f0a16b | 556 | /* XXX: Why not use skb->mac_len? */ |
b0e380b1 | 557 | if (skb->network_header - skb->mac_header != 2) |
a34c0932 JP |
558 | arc_printk(D_NORMAL, dev, "arcnet_header: Yikes! diff (%u) is not 2!\n", |
559 | skb->network_header - skb->mac_header); | |
1da177e4 | 560 | return -2; /* return error -- can't transmit yet! */ |
7f5e760c | 561 | } else { |
1da177e4 | 562 | /* otherwise, we can just add the header as usual. */ |
cb334648 | 563 | _daddr = *(uint8_t *)daddr; |
1da177e4 LT |
564 | proto_num = lp->default_proto[_daddr]; |
565 | proto = arc_proto_map[proto_num]; | |
a34c0932 JP |
566 | arc_printk(D_DURING, dev, "building header for %02Xh using protocol '%c'\n", |
567 | proto_num, proto->suffix); | |
1da177e4 | 568 | if (proto == &arc_proto_null && arc_bcast_proto != proto) { |
a34c0932 JP |
569 | arc_printk(D_DURING, dev, "actually, let's use '%c' instead.\n", |
570 | arc_bcast_proto->suffix); | |
1da177e4 LT |
571 | proto = arc_bcast_proto; |
572 | } | |
573 | } | |
574 | return proto->build_header(skb, dev, type, _daddr); | |
575 | } | |
576 | ||
1da177e4 | 577 | /* Called by the kernel in order to transmit a packet. */ |
61357325 | 578 | netdev_tx_t arcnet_send_packet(struct sk_buff *skb, |
cb334648 | 579 | struct net_device *dev) |
1da177e4 | 580 | { |
454d7c9b | 581 | struct arcnet_local *lp = netdev_priv(dev); |
1da177e4 LT |
582 | struct archdr *pkt; |
583 | struct arc_rfc1201 *soft; | |
584 | struct ArcProto *proto; | |
585 | int txbuf; | |
586 | unsigned long flags; | |
b82de0e2 | 587 | int retval; |
1da177e4 | 588 | |
a34c0932 JP |
589 | arc_printk(D_DURING, dev, |
590 | "transmit requested (status=%Xh, txbufs=%d/%d, len=%d, protocol %x)\n", | |
e15b0362 | 591 | lp->hw.status(dev), lp->cur_tx, lp->next_tx, skb->len, skb->protocol); |
1da177e4 | 592 | |
cb334648 | 593 | pkt = (struct archdr *)skb->data; |
1da177e4 LT |
594 | soft = &pkt->soft.rfc1201; |
595 | proto = arc_proto_map[soft->proto]; | |
596 | ||
a34c0932 JP |
597 | arc_printk(D_SKB_SIZE, dev, "skb: transmitting %d bytes to %02X\n", |
598 | skb->len, pkt->hard.dest); | |
72aeea48 JP |
599 | if (BUGLVL(D_SKB)) |
600 | arcnet_dump_skb(dev, skb, "tx"); | |
1da177e4 LT |
601 | |
602 | /* fits in one packet? */ | |
603 | if (skb->len - ARC_HDR_SIZE > XMTU && !proto->continue_tx) { | |
a34c0932 | 604 | arc_printk(D_NORMAL, dev, "fixme: packet too large: compensating badly!\n"); |
1da177e4 | 605 | dev_kfree_skb(skb); |
c6bb15a0 | 606 | return NETDEV_TX_OK; /* don't try again */ |
1da177e4 LT |
607 | } |
608 | ||
609 | /* We're busy transmitting a packet... */ | |
610 | netif_stop_queue(dev); | |
611 | ||
612 | spin_lock_irqsave(&lp->lock, flags); | |
e15b0362 | 613 | lp->hw.intmask(dev, 0); |
cb334648 | 614 | if (lp->next_tx == -1) |
c6bb15a0 | 615 | txbuf = get_arcbuf(dev); |
7f5e760c | 616 | else |
c6bb15a0 | 617 | txbuf = -1; |
7f5e760c | 618 | |
1da177e4 LT |
619 | if (txbuf != -1) { |
620 | if (proto->prepare_tx(dev, pkt, skb->len, txbuf) && | |
621 | !proto->ack_tx) { | |
622 | /* done right away and we don't want to acknowledge | |
f2f0a16b JP |
623 | * the package later - forget about it now |
624 | */ | |
5803c512 | 625 | dev->stats.tx_bytes += skb->len; |
b82de0e2 | 626 | dev_kfree_skb(skb); |
1da177e4 LT |
627 | } else { |
628 | /* do it the 'split' way */ | |
629 | lp->outgoing.proto = proto; | |
630 | lp->outgoing.skb = skb; | |
631 | lp->outgoing.pkt = pkt; | |
632 | ||
633 | if (proto->continue_tx && | |
634 | proto->continue_tx(dev, txbuf)) { | |
a34c0932 JP |
635 | arc_printk(D_NORMAL, dev, |
636 | "bug! continue_tx finished the first time! (proto='%c')\n", | |
637 | proto->suffix); | |
1da177e4 LT |
638 | } |
639 | } | |
c6bb15a0 | 640 | retval = NETDEV_TX_OK; |
1da177e4 LT |
641 | lp->next_tx = txbuf; |
642 | } else { | |
c6bb15a0 | 643 | retval = NETDEV_TX_BUSY; |
1da177e4 LT |
644 | } |
645 | ||
a34c0932 | 646 | arc_printk(D_DEBUG, dev, "%s: %d: %s, status: %x\n", |
e15b0362 | 647 | __FILE__, __LINE__, __func__, lp->hw.status(dev)); |
1da177e4 | 648 | /* make sure we didn't ignore a TX IRQ while we were in here */ |
e15b0362 | 649 | lp->hw.intmask(dev, 0); |
1da177e4 | 650 | |
a34c0932 | 651 | arc_printk(D_DEBUG, dev, "%s: %d: %s\n", __FILE__, __LINE__, __func__); |
cb334648 | 652 | lp->intmask |= TXFREEflag | EXCNAKflag; |
e15b0362 | 653 | lp->hw.intmask(dev, lp->intmask); |
a34c0932 | 654 | arc_printk(D_DEBUG, dev, "%s: %d: %s, status: %x\n", |
e15b0362 | 655 | __FILE__, __LINE__, __func__, lp->hw.status(dev)); |
1da177e4 | 656 | |
8890624a MG |
657 | arcnet_led_event(dev, ARCNET_LED_EVENT_TX); |
658 | ||
1da177e4 | 659 | spin_unlock_irqrestore(&lp->lock, flags); |
c6bb15a0 | 660 | return retval; /* no need to try again */ |
1da177e4 | 661 | } |
811eafc0 | 662 | EXPORT_SYMBOL(arcnet_send_packet); |
1da177e4 | 663 | |
f2f0a16b | 664 | /* Actually start transmitting a packet that was loaded into a buffer |
1da177e4 LT |
665 | * by prepare_tx. This should _only_ be called by the interrupt handler. |
666 | */ | |
667 | static int go_tx(struct net_device *dev) | |
668 | { | |
454d7c9b | 669 | struct arcnet_local *lp = netdev_priv(dev); |
1da177e4 | 670 | |
a34c0932 | 671 | arc_printk(D_DURING, dev, "go_tx: status=%Xh, intmask=%Xh, next_tx=%d, cur_tx=%d\n", |
e15b0362 | 672 | lp->hw.status(dev), lp->intmask, lp->next_tx, lp->cur_tx); |
1da177e4 LT |
673 | |
674 | if (lp->cur_tx != -1 || lp->next_tx == -1) | |
675 | return 0; | |
676 | ||
72aeea48 JP |
677 | if (BUGLVL(D_TX)) |
678 | arcnet_dump_packet(dev, lp->next_tx, "go_tx", 0); | |
1da177e4 LT |
679 | |
680 | lp->cur_tx = lp->next_tx; | |
681 | lp->next_tx = -1; | |
682 | ||
683 | /* start sending */ | |
e15b0362 | 684 | lp->hw.command(dev, TXcmd | (lp->cur_tx << 3)); |
1da177e4 | 685 | |
5803c512 | 686 | dev->stats.tx_packets++; |
1da177e4 LT |
687 | lp->lasttrans_dest = lp->lastload_dest; |
688 | lp->lastload_dest = 0; | |
689 | lp->excnak_pending = 0; | |
cb334648 | 690 | lp->intmask |= TXFREEflag | EXCNAKflag; |
1da177e4 LT |
691 | |
692 | return 1; | |
693 | } | |
694 | ||
1da177e4 | 695 | /* Called by the kernel when transmit times out */ |
bca5b893 | 696 | void arcnet_timeout(struct net_device *dev) |
1da177e4 LT |
697 | { |
698 | unsigned long flags; | |
454d7c9b | 699 | struct arcnet_local *lp = netdev_priv(dev); |
e15b0362 | 700 | int status = lp->hw.status(dev); |
1da177e4 LT |
701 | char *msg; |
702 | ||
703 | spin_lock_irqsave(&lp->lock, flags); | |
704 | if (status & TXFREEflag) { /* transmit _DID_ finish */ | |
705 | msg = " - missed IRQ?"; | |
706 | } else { | |
707 | msg = ""; | |
5803c512 | 708 | dev->stats.tx_aborted_errors++; |
1da177e4 | 709 | lp->timed_out = 1; |
e15b0362 | 710 | lp->hw.command(dev, NOTXcmd | (lp->cur_tx << 3)); |
1da177e4 | 711 | } |
5803c512 | 712 | dev->stats.tx_errors++; |
1da177e4 LT |
713 | |
714 | /* make sure we didn't miss a TX or a EXC NAK IRQ */ | |
e15b0362 | 715 | lp->hw.intmask(dev, 0); |
cb334648 | 716 | lp->intmask |= TXFREEflag | EXCNAKflag; |
e15b0362 | 717 | lp->hw.intmask(dev, lp->intmask); |
cb334648 | 718 | |
1da177e4 LT |
719 | spin_unlock_irqrestore(&lp->lock, flags); |
720 | ||
cb334648 | 721 | if (time_after(jiffies, lp->last_timeout + 10 * HZ)) { |
a34c0932 JP |
722 | arc_printk(D_EXTRA, dev, "tx timed out%s (status=%Xh, intmask=%Xh, dest=%02Xh)\n", |
723 | msg, status, lp->intmask, lp->lasttrans_dest); | |
1da177e4 LT |
724 | lp->last_timeout = jiffies; |
725 | } | |
726 | ||
727 | if (lp->cur_tx == -1) | |
728 | netif_wake_queue(dev); | |
729 | } | |
811eafc0 | 730 | EXPORT_SYMBOL(arcnet_timeout); |
1da177e4 | 731 | |
f2f0a16b | 732 | /* The typical workload of the driver: Handle the network interface |
1da177e4 LT |
733 | * interrupts. Establish which device needs attention, and call the correct |
734 | * chipset interrupt handler. | |
735 | */ | |
7d12e780 | 736 | irqreturn_t arcnet_interrupt(int irq, void *dev_id) |
1da177e4 LT |
737 | { |
738 | struct net_device *dev = dev_id; | |
739 | struct arcnet_local *lp; | |
740 | int recbuf, status, diagstatus, didsomething, boguscount; | |
741 | int retval = IRQ_NONE; | |
742 | ||
a34c0932 | 743 | arc_printk(D_DURING, dev, "\n"); |
1da177e4 | 744 | |
a34c0932 | 745 | arc_printk(D_DURING, dev, "in arcnet_interrupt\n"); |
454d7c9b WC |
746 | |
747 | lp = netdev_priv(dev); | |
5d9428de | 748 | BUG_ON(!lp); |
cb334648 | 749 | |
1da177e4 LT |
750 | spin_lock(&lp->lock); |
751 | ||
f2f0a16b JP |
752 | /* RESET flag was enabled - if device is not running, we must |
753 | * clear it right away (but nothing else). | |
1da177e4 LT |
754 | */ |
755 | if (!netif_running(dev)) { | |
e15b0362 JP |
756 | if (lp->hw.status(dev) & RESETflag) |
757 | lp->hw.command(dev, CFLAGScmd | RESETclear); | |
758 | lp->hw.intmask(dev, 0); | |
1da177e4 | 759 | spin_unlock(&lp->lock); |
226ee675 | 760 | return retval; |
1da177e4 LT |
761 | } |
762 | ||
a34c0932 | 763 | arc_printk(D_DURING, dev, "in arcnet_inthandler (status=%Xh, intmask=%Xh)\n", |
e15b0362 | 764 | lp->hw.status(dev), lp->intmask); |
1da177e4 LT |
765 | |
766 | boguscount = 5; | |
767 | do { | |
e15b0362 | 768 | status = lp->hw.status(dev); |
cb334648 | 769 | diagstatus = (status >> 8) & 0xFF; |
1da177e4 | 770 | |
a34c0932 JP |
771 | arc_printk(D_DEBUG, dev, "%s: %d: %s: status=%x\n", |
772 | __FILE__, __LINE__, __func__, status); | |
1da177e4 LT |
773 | didsomething = 0; |
774 | ||
f2f0a16b | 775 | /* RESET flag was enabled - card is resetting and if RX is |
1da177e4 | 776 | * disabled, it's NOT because we just got a packet. |
cb334648 | 777 | * |
f2f0a16b JP |
778 | * The card is in an undefined state. |
779 | * Clear it out and start over. | |
1da177e4 LT |
780 | */ |
781 | if (status & RESETflag) { | |
a34c0932 JP |
782 | arc_printk(D_NORMAL, dev, "spurious reset (status=%Xh)\n", |
783 | status); | |
1da177e4 LT |
784 | arcnet_close(dev); |
785 | arcnet_open(dev); | |
786 | ||
787 | /* get out of the interrupt handler! */ | |
788 | break; | |
789 | } | |
f2f0a16b JP |
790 | /* RX is inhibited - we must have received something. |
791 | * Prepare to receive into the next buffer. | |
cb334648 | 792 | * |
f2f0a16b JP |
793 | * We don't actually copy the received packet from the card |
794 | * until after the transmit handler runs (and possibly | |
795 | * launches the next tx); this should improve latency slightly | |
796 | * if we get both types of interrupts at once. | |
1da177e4 LT |
797 | */ |
798 | recbuf = -1; | |
799 | if (status & lp->intmask & NORXflag) { | |
800 | recbuf = lp->cur_rx; | |
a34c0932 JP |
801 | arc_printk(D_DURING, dev, "Buffer #%d: receive irq (status=%Xh)\n", |
802 | recbuf, status); | |
1da177e4 LT |
803 | |
804 | lp->cur_rx = get_arcbuf(dev); | |
805 | if (lp->cur_rx != -1) { | |
a34c0932 JP |
806 | arc_printk(D_DURING, dev, "enabling receive to buffer #%d\n", |
807 | lp->cur_rx); | |
e15b0362 | 808 | lp->hw.command(dev, RXcmd | (lp->cur_rx << 3) | RXbcasts); |
1da177e4 LT |
809 | } |
810 | didsomething++; | |
811 | } | |
812 | ||
cb334648 | 813 | if ((diagstatus & EXCNAKflag)) { |
a34c0932 JP |
814 | arc_printk(D_DURING, dev, "EXCNAK IRQ (diagstat=%Xh)\n", |
815 | diagstatus); | |
1da177e4 | 816 | |
e15b0362 | 817 | lp->hw.command(dev, NOTXcmd); /* disable transmit */ |
cb334648 | 818 | lp->excnak_pending = 1; |
1da177e4 | 819 | |
e15b0362 | 820 | lp->hw.command(dev, EXCNAKclear); |
1da177e4 | 821 | lp->intmask &= ~(EXCNAKflag); |
cb334648 JP |
822 | didsomething++; |
823 | } | |
1da177e4 | 824 | |
1da177e4 LT |
825 | /* a transmit finished, and we're interested in it. */ |
826 | if ((status & lp->intmask & TXFREEflag) || lp->timed_out) { | |
cb334648 | 827 | lp->intmask &= ~(TXFREEflag | EXCNAKflag); |
1da177e4 | 828 | |
d6d7d3ed JP |
829 | arc_printk(D_DURING, dev, "TX IRQ (stat=%Xh)\n", |
830 | status); | |
1da177e4 LT |
831 | |
832 | if (lp->cur_tx != -1 && !lp->timed_out) { | |
cb334648 | 833 | if (!(status & TXACKflag)) { |
1da177e4 | 834 | if (lp->lasttrans_dest != 0) { |
a34c0932 JP |
835 | arc_printk(D_EXTRA, dev, |
836 | "transmit was not acknowledged! (status=%Xh, dest=%02Xh)\n", | |
837 | status, | |
838 | lp->lasttrans_dest); | |
5803c512 SH |
839 | dev->stats.tx_errors++; |
840 | dev->stats.tx_carrier_errors++; | |
1da177e4 | 841 | } else { |
a34c0932 JP |
842 | arc_printk(D_DURING, dev, |
843 | "broadcast was not acknowledged; that's normal (status=%Xh, dest=%02Xh)\n", | |
844 | status, | |
845 | lp->lasttrans_dest); | |
1da177e4 LT |
846 | } |
847 | } | |
848 | ||
849 | if (lp->outgoing.proto && | |
850 | lp->outgoing.proto->ack_tx) { | |
cb334648 | 851 | int ackstatus; |
01a1d5ac | 852 | |
cb334648 JP |
853 | if (status & TXACKflag) |
854 | ackstatus = 2; | |
855 | else if (lp->excnak_pending) | |
856 | ackstatus = 1; | |
857 | else | |
858 | ackstatus = 0; | |
859 | ||
860 | lp->outgoing.proto | |
861 | ->ack_tx(dev, ackstatus); | |
1da177e4 LT |
862 | } |
863 | } | |
864 | if (lp->cur_tx != -1) | |
865 | release_arcbuf(dev, lp->cur_tx); | |
866 | ||
867 | lp->cur_tx = -1; | |
868 | lp->timed_out = 0; | |
869 | didsomething++; | |
870 | ||
871 | /* send another packet if there is one */ | |
872 | go_tx(dev); | |
873 | ||
874 | /* continue a split packet, if any */ | |
d6d7d3ed JP |
875 | if (lp->outgoing.proto && |
876 | lp->outgoing.proto->continue_tx) { | |
1da177e4 | 877 | int txbuf = get_arcbuf(dev); |
01a1d5ac | 878 | |
1da177e4 LT |
879 | if (txbuf != -1) { |
880 | if (lp->outgoing.proto->continue_tx(dev, txbuf)) { | |
881 | /* that was the last segment */ | |
5803c512 | 882 | dev->stats.tx_bytes += lp->outgoing.skb->len; |
7f5e760c | 883 | if (!lp->outgoing.proto->ack_tx) { |
cb334648 JP |
884 | dev_kfree_skb_irq(lp->outgoing.skb); |
885 | lp->outgoing.proto = NULL; | |
886 | } | |
1da177e4 LT |
887 | } |
888 | lp->next_tx = txbuf; | |
889 | } | |
890 | } | |
891 | /* inform upper layers of idleness, if necessary */ | |
892 | if (lp->cur_tx == -1) | |
893 | netif_wake_queue(dev); | |
894 | } | |
895 | /* now process the received packet, if any */ | |
896 | if (recbuf != -1) { | |
72aeea48 JP |
897 | if (BUGLVL(D_RX)) |
898 | arcnet_dump_packet(dev, recbuf, "rx irq", 0); | |
1da177e4 LT |
899 | |
900 | arcnet_rx(dev, recbuf); | |
901 | release_arcbuf(dev, recbuf); | |
902 | ||
903 | didsomething++; | |
904 | } | |
905 | if (status & lp->intmask & RECONflag) { | |
e15b0362 | 906 | lp->hw.command(dev, CFLAGScmd | CONFIGclear); |
5803c512 | 907 | dev->stats.tx_carrier_errors++; |
1da177e4 | 908 | |
a34c0932 JP |
909 | arc_printk(D_RECON, dev, "Network reconfiguration detected (status=%Xh)\n", |
910 | status); | |
8890624a | 911 | arcnet_led_event(dev, ARCNET_LED_EVENT_RECON); |
c6bb15a0 | 912 | /* MYRECON bit is at bit 7 of diagstatus */ |
cb334648 | 913 | if (diagstatus & 0x80) |
a34c0932 | 914 | arc_printk(D_RECON, dev, "Put out that recon myself\n"); |
1da177e4 LT |
915 | |
916 | /* is the RECON info empty or old? */ | |
917 | if (!lp->first_recon || !lp->last_recon || | |
9307b570 | 918 | time_after(jiffies, lp->last_recon + HZ * 10)) { |
1da177e4 | 919 | if (lp->network_down) |
a34c0932 | 920 | arc_printk(D_NORMAL, dev, "reconfiguration detected: cabling restored?\n"); |
1da177e4 LT |
921 | lp->first_recon = lp->last_recon = jiffies; |
922 | lp->num_recons = lp->network_down = 0; | |
923 | ||
a34c0932 | 924 | arc_printk(D_DURING, dev, "recon: clearing counters.\n"); |
1da177e4 LT |
925 | } else { /* add to current RECON counter */ |
926 | lp->last_recon = jiffies; | |
927 | lp->num_recons++; | |
928 | ||
a34c0932 JP |
929 | arc_printk(D_DURING, dev, "recon: counter=%d, time=%lds, net=%d\n", |
930 | lp->num_recons, | |
931 | (lp->last_recon - lp->first_recon) / HZ, | |
932 | lp->network_down); | |
1da177e4 LT |
933 | |
934 | /* if network is marked up; | |
935 | * and first_recon and last_recon are 60+ apart; | |
936 | * and the average no. of recons counted is | |
937 | * > RECON_THRESHOLD/min; | |
938 | * then print a warning message. | |
939 | */ | |
8e95a202 JP |
940 | if (!lp->network_down && |
941 | (lp->last_recon - lp->first_recon) <= HZ * 60 && | |
942 | lp->num_recons >= RECON_THRESHOLD) { | |
1da177e4 | 943 | lp->network_down = 1; |
a34c0932 | 944 | arc_printk(D_NORMAL, dev, "many reconfigurations detected: cabling problem?\n"); |
8e95a202 JP |
945 | } else if (!lp->network_down && |
946 | lp->last_recon - lp->first_recon > HZ * 60) { | |
d6d7d3ed JP |
947 | /* reset counters if we've gone for |
948 | * over a minute. | |
949 | */ | |
1da177e4 LT |
950 | lp->first_recon = lp->last_recon; |
951 | lp->num_recons = 1; | |
952 | } | |
953 | } | |
9307b570 | 954 | } else if (lp->network_down && |
cb334648 | 955 | time_after(jiffies, lp->last_recon + HZ * 10)) { |
1da177e4 | 956 | if (lp->network_down) |
a34c0932 | 957 | arc_printk(D_NORMAL, dev, "cabling restored?\n"); |
1da177e4 LT |
958 | lp->first_recon = lp->last_recon = 0; |
959 | lp->num_recons = lp->network_down = 0; | |
960 | ||
a34c0932 | 961 | arc_printk(D_DURING, dev, "not recon: clearing counters anyway.\n"); |
1da177e4 LT |
962 | } |
963 | ||
7f5e760c | 964 | if (didsomething) |
1da177e4 | 965 | retval |= IRQ_HANDLED; |
7f5e760c | 966 | } while (--boguscount && didsomething); |
1da177e4 | 967 | |
a34c0932 | 968 | arc_printk(D_DURING, dev, "arcnet_interrupt complete (status=%Xh, count=%d)\n", |
e15b0362 | 969 | lp->hw.status(dev), boguscount); |
a34c0932 | 970 | arc_printk(D_DURING, dev, "\n"); |
1da177e4 | 971 | |
e15b0362 | 972 | lp->hw.intmask(dev, 0); |
1da177e4 | 973 | udelay(1); |
e15b0362 | 974 | lp->hw.intmask(dev, lp->intmask); |
cb334648 | 975 | |
1da177e4 LT |
976 | spin_unlock(&lp->lock); |
977 | return retval; | |
978 | } | |
811eafc0 | 979 | EXPORT_SYMBOL(arcnet_interrupt); |
1da177e4 | 980 | |
f2f0a16b | 981 | /* This is a generic packet receiver that calls arcnet??_rx depending on the |
1da177e4 LT |
982 | * protocol ID found. |
983 | */ | |
f03aa2d8 | 984 | static void arcnet_rx(struct net_device *dev, int bufnum) |
1da177e4 | 985 | { |
454d7c9b | 986 | struct arcnet_local *lp = netdev_priv(dev); |
1da177e4 LT |
987 | struct archdr pkt; |
988 | struct arc_rfc1201 *soft; | |
989 | int length, ofs; | |
990 | ||
991 | soft = &pkt.soft.rfc1201; | |
992 | ||
087d273c | 993 | lp->hw.copy_from_card(dev, bufnum, 0, &pkt, ARC_HDR_SIZE); |
1da177e4 LT |
994 | if (pkt.hard.offset[0]) { |
995 | ofs = pkt.hard.offset[0]; | |
996 | length = 256 - ofs; | |
997 | } else { | |
998 | ofs = pkt.hard.offset[1]; | |
999 | length = 512 - ofs; | |
1000 | } | |
1001 | ||
1002 | /* get the full header, if possible */ | |
7f5e760c | 1003 | if (sizeof(pkt.soft) <= length) { |
1da177e4 | 1004 | lp->hw.copy_from_card(dev, bufnum, ofs, soft, sizeof(pkt.soft)); |
7f5e760c | 1005 | } else { |
1da177e4 LT |
1006 | memset(&pkt.soft, 0, sizeof(pkt.soft)); |
1007 | lp->hw.copy_from_card(dev, bufnum, ofs, soft, length); | |
1008 | } | |
1009 | ||
a34c0932 JP |
1010 | arc_printk(D_DURING, dev, "Buffer #%d: received packet from %02Xh to %02Xh (%d+4 bytes)\n", |
1011 | bufnum, pkt.hard.source, pkt.hard.dest, length); | |
1da177e4 | 1012 | |
5803c512 SH |
1013 | dev->stats.rx_packets++; |
1014 | dev->stats.rx_bytes += length + ARC_HDR_SIZE; | |
1da177e4 LT |
1015 | |
1016 | /* call the right receiver for the protocol */ | |
1017 | if (arc_proto_map[soft->proto]->is_ip) { | |
72aeea48 | 1018 | if (BUGLVL(D_PROTO)) { |
1da177e4 LT |
1019 | struct ArcProto |
1020 | *oldp = arc_proto_map[lp->default_proto[pkt.hard.source]], | |
1021 | *newp = arc_proto_map[soft->proto]; | |
1022 | ||
1023 | if (oldp != newp) { | |
a34c0932 JP |
1024 | arc_printk(D_PROTO, dev, |
1025 | "got protocol %02Xh; encap for host %02Xh is now '%c' (was '%c')\n", | |
1026 | soft->proto, pkt.hard.source, | |
1027 | newp->suffix, oldp->suffix); | |
1da177e4 LT |
1028 | } |
1029 | } | |
1030 | ||
1031 | /* broadcasts will always be done with the last-used encap. */ | |
1032 | lp->default_proto[0] = soft->proto; | |
1033 | ||
1034 | /* in striking contrast, the following isn't a hack. */ | |
1035 | lp->default_proto[pkt.hard.source] = soft->proto; | |
1036 | } | |
1037 | /* call the protocol-specific receiver. */ | |
1038 | arc_proto_map[soft->proto]->rx(dev, bufnum, &pkt, length); | |
1039 | } | |
1040 | ||
1da177e4 LT |
1041 | static void null_rx(struct net_device *dev, int bufnum, |
1042 | struct archdr *pkthdr, int length) | |
1043 | { | |
a34c0932 JP |
1044 | arc_printk(D_PROTO, dev, |
1045 | "rx: don't know how to deal with proto %02Xh from host %02Xh.\n", | |
1046 | pkthdr->soft.rfc1201.proto, pkthdr->hard.source); | |
1da177e4 LT |
1047 | } |
1048 | ||
1da177e4 LT |
1049 | static int null_build_header(struct sk_buff *skb, struct net_device *dev, |
1050 | unsigned short type, uint8_t daddr) | |
1051 | { | |
454d7c9b | 1052 | struct arcnet_local *lp = netdev_priv(dev); |
1da177e4 | 1053 | |
a34c0932 JP |
1054 | arc_printk(D_PROTO, dev, |
1055 | "tx: can't build header for encap %02Xh; load a protocol driver.\n", | |
1056 | lp->default_proto[daddr]); | |
1da177e4 LT |
1057 | |
1058 | /* always fails */ | |
1059 | return 0; | |
1060 | } | |
1061 | ||
1da177e4 LT |
1062 | /* the "do nothing" prepare_tx function warns that there's nothing to do. */ |
1063 | static int null_prepare_tx(struct net_device *dev, struct archdr *pkt, | |
1064 | int length, int bufnum) | |
1065 | { | |
454d7c9b | 1066 | struct arcnet_local *lp = netdev_priv(dev); |
1da177e4 LT |
1067 | struct arc_hardware newpkt; |
1068 | ||
a34c0932 | 1069 | arc_printk(D_PROTO, dev, "tx: no encap for this host; load a protocol driver.\n"); |
1da177e4 LT |
1070 | |
1071 | /* send a packet to myself -- will never get received, of course */ | |
1072 | newpkt.source = newpkt.dest = dev->dev_addr[0]; | |
1073 | ||
1074 | /* only one byte of actual data (and it's random) */ | |
1075 | newpkt.offset[0] = 0xFF; | |
1076 | ||
1077 | lp->hw.copy_to_card(dev, bufnum, 0, &newpkt, ARC_HDR_SIZE); | |
1078 | ||
1079 | return 1; /* done */ | |
1080 | } |