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1da177e4 LT |
1 | /********************************************************************* |
2 | * | |
3 | * Filename: irlap_event.c | |
4 | * Version: 0.9 | |
5 | * Description: IrLAP state machine implementation | |
6 | * Status: Experimental. | |
7 | * Author: Dag Brattli <dag@brattli.net> | |
8 | * Created at: Sat Aug 16 00:59:29 1997 | |
9 | * Modified at: Sat Dec 25 21:07:57 1999 | |
10 | * Modified by: Dag Brattli <dag@brattli.net> | |
11 | * | |
12 | * Copyright (c) 1998-2000 Dag Brattli <dag@brattli.net>, | |
13 | * Copyright (c) 1998 Thomas Davis <ratbert@radiks.net> | |
14 | * All Rights Reserved. | |
15 | * Copyright (c) 2000-2003 Jean Tourrilhes <jt@hpl.hp.com> | |
16 | * | |
17 | * This program is free software; you can redistribute it and/or | |
18 | * modify it under the terms of the GNU General Public License as | |
19 | * published by the Free Software Foundation; either version 2 of | |
20 | * the License, or (at your option) any later version. | |
21 | * | |
96de0e25 | 22 | * Neither Dag Brattli nor University of Tromsø admit liability nor |
1da177e4 LT |
23 | * provide warranty for any of this software. This material is |
24 | * provided "AS-IS" and at no charge. | |
25 | * | |
26 | ********************************************************************/ | |
27 | ||
1da177e4 LT |
28 | #include <linux/string.h> |
29 | #include <linux/kernel.h> | |
30 | #include <linux/delay.h> | |
31 | #include <linux/skbuff.h> | |
5a0e3ad6 | 32 | #include <linux/slab.h> |
1da177e4 LT |
33 | |
34 | #include <net/irda/irda.h> | |
35 | #include <net/irda/irlap_event.h> | |
36 | ||
37 | #include <net/irda/timer.h> | |
38 | #include <net/irda/irlap.h> | |
39 | #include <net/irda/irlap_frame.h> | |
40 | #include <net/irda/qos.h> | |
41 | #include <net/irda/parameters.h> | |
42 | #include <net/irda/irlmp.h> /* irlmp_flow_indication(), ... */ | |
43 | ||
44 | #include <net/irda/irda_device.h> | |
45 | ||
46 | #ifdef CONFIG_IRDA_FAST_RR | |
47 | int sysctl_fast_poll_increase = 50; | |
48 | #endif | |
49 | ||
50 | static int irlap_state_ndm (struct irlap_cb *self, IRLAP_EVENT event, | |
51 | struct sk_buff *skb, struct irlap_info *info); | |
52 | static int irlap_state_query (struct irlap_cb *self, IRLAP_EVENT event, | |
53 | struct sk_buff *skb, struct irlap_info *info); | |
54 | static int irlap_state_reply (struct irlap_cb *self, IRLAP_EVENT event, | |
55 | struct sk_buff *skb, struct irlap_info *info); | |
56 | static int irlap_state_conn (struct irlap_cb *self, IRLAP_EVENT event, | |
57 | struct sk_buff *skb, struct irlap_info *info); | |
58 | static int irlap_state_setup (struct irlap_cb *self, IRLAP_EVENT event, | |
59 | struct sk_buff *skb, struct irlap_info *info); | |
60 | static int irlap_state_offline(struct irlap_cb *self, IRLAP_EVENT event, | |
61 | struct sk_buff *skb, struct irlap_info *info); | |
62 | static int irlap_state_xmit_p (struct irlap_cb *self, IRLAP_EVENT event, | |
63 | struct sk_buff *skb, struct irlap_info *info); | |
64 | static int irlap_state_pclose (struct irlap_cb *self, IRLAP_EVENT event, | |
65 | struct sk_buff *skb, struct irlap_info *info); | |
66 | static int irlap_state_nrm_p (struct irlap_cb *self, IRLAP_EVENT event, | |
67 | struct sk_buff *skb, struct irlap_info *info); | |
68 | static int irlap_state_reset_wait(struct irlap_cb *self, IRLAP_EVENT event, | |
69 | struct sk_buff *skb, struct irlap_info *info); | |
70 | static int irlap_state_reset (struct irlap_cb *self, IRLAP_EVENT event, | |
71 | struct sk_buff *skb, struct irlap_info *info); | |
72 | static int irlap_state_nrm_s (struct irlap_cb *self, IRLAP_EVENT event, | |
73 | struct sk_buff *skb, struct irlap_info *info); | |
74 | static int irlap_state_xmit_s (struct irlap_cb *self, IRLAP_EVENT event, | |
75 | struct sk_buff *skb, struct irlap_info *info); | |
76 | static int irlap_state_sclose (struct irlap_cb *self, IRLAP_EVENT event, | |
77 | struct sk_buff *skb, struct irlap_info *info); | |
78 | static int irlap_state_reset_check(struct irlap_cb *, IRLAP_EVENT event, | |
79 | struct sk_buff *, struct irlap_info *); | |
80 | ||
81 | #ifdef CONFIG_IRDA_DEBUG | |
36cbd3dc | 82 | static const char *const irlap_event[] = { |
1da177e4 LT |
83 | "DISCOVERY_REQUEST", |
84 | "CONNECT_REQUEST", | |
85 | "CONNECT_RESPONSE", | |
86 | "DISCONNECT_REQUEST", | |
87 | "DATA_REQUEST", | |
88 | "RESET_REQUEST", | |
89 | "RESET_RESPONSE", | |
90 | "SEND_I_CMD", | |
91 | "SEND_UI_FRAME", | |
92 | "RECV_DISCOVERY_XID_CMD", | |
93 | "RECV_DISCOVERY_XID_RSP", | |
94 | "RECV_SNRM_CMD", | |
95 | "RECV_TEST_CMD", | |
96 | "RECV_TEST_RSP", | |
97 | "RECV_UA_RSP", | |
98 | "RECV_DM_RSP", | |
99 | "RECV_RD_RSP", | |
100 | "RECV_I_CMD", | |
101 | "RECV_I_RSP", | |
102 | "RECV_UI_FRAME", | |
103 | "RECV_FRMR_RSP", | |
104 | "RECV_RR_CMD", | |
105 | "RECV_RR_RSP", | |
106 | "RECV_RNR_CMD", | |
107 | "RECV_RNR_RSP", | |
108 | "RECV_REJ_CMD", | |
109 | "RECV_REJ_RSP", | |
110 | "RECV_SREJ_CMD", | |
111 | "RECV_SREJ_RSP", | |
112 | "RECV_DISC_CMD", | |
113 | "SLOT_TIMER_EXPIRED", | |
114 | "QUERY_TIMER_EXPIRED", | |
115 | "FINAL_TIMER_EXPIRED", | |
116 | "POLL_TIMER_EXPIRED", | |
117 | "DISCOVERY_TIMER_EXPIRED", | |
118 | "WD_TIMER_EXPIRED", | |
119 | "BACKOFF_TIMER_EXPIRED", | |
120 | "MEDIA_BUSY_TIMER_EXPIRED", | |
121 | }; | |
122 | #endif /* CONFIG_IRDA_DEBUG */ | |
123 | ||
36cbd3dc | 124 | const char *const irlap_state[] = { |
1da177e4 LT |
125 | "LAP_NDM", |
126 | "LAP_QUERY", | |
127 | "LAP_REPLY", | |
128 | "LAP_CONN", | |
129 | "LAP_SETUP", | |
130 | "LAP_OFFLINE", | |
131 | "LAP_XMIT_P", | |
132 | "LAP_PCLOSE", | |
133 | "LAP_NRM_P", | |
134 | "LAP_RESET_WAIT", | |
135 | "LAP_RESET", | |
136 | "LAP_NRM_S", | |
137 | "LAP_XMIT_S", | |
138 | "LAP_SCLOSE", | |
139 | "LAP_RESET_CHECK", | |
140 | }; | |
141 | ||
142 | static int (*state[])(struct irlap_cb *self, IRLAP_EVENT event, | |
143 | struct sk_buff *skb, struct irlap_info *info) = | |
144 | { | |
145 | irlap_state_ndm, | |
146 | irlap_state_query, | |
147 | irlap_state_reply, | |
148 | irlap_state_conn, | |
149 | irlap_state_setup, | |
150 | irlap_state_offline, | |
151 | irlap_state_xmit_p, | |
152 | irlap_state_pclose, | |
153 | irlap_state_nrm_p, | |
154 | irlap_state_reset_wait, | |
155 | irlap_state_reset, | |
156 | irlap_state_nrm_s, | |
157 | irlap_state_xmit_s, | |
158 | irlap_state_sclose, | |
159 | irlap_state_reset_check, | |
160 | }; | |
161 | ||
162 | /* | |
163 | * Function irda_poll_timer_expired (data) | |
164 | * | |
165 | * Poll timer has expired. Normally we must now send a RR frame to the | |
166 | * remote device | |
167 | */ | |
168 | static void irlap_poll_timer_expired(void *data) | |
169 | { | |
170 | struct irlap_cb *self = (struct irlap_cb *) data; | |
171 | ||
172 | IRDA_ASSERT(self != NULL, return;); | |
173 | IRDA_ASSERT(self->magic == LAP_MAGIC, return;); | |
174 | ||
175 | irlap_do_event(self, POLL_TIMER_EXPIRED, NULL, NULL); | |
176 | } | |
177 | ||
178 | /* | |
179 | * Calculate and set time before we will have to send back the pf bit | |
180 | * to the peer. Use in primary. | |
181 | * Make sure that state is XMIT_P/XMIT_S when calling this function | |
182 | * (and that nobody messed up with the state). - Jean II | |
183 | */ | |
184 | static void irlap_start_poll_timer(struct irlap_cb *self, int timeout) | |
185 | { | |
186 | IRDA_ASSERT(self != NULL, return;); | |
187 | IRDA_ASSERT(self->magic == LAP_MAGIC, return;); | |
188 | ||
189 | #ifdef CONFIG_IRDA_FAST_RR | |
190 | /* | |
191 | * Send out the RR frames faster if our own transmit queue is empty, or | |
192 | * if the peer is busy. The effect is a much faster conversation | |
193 | */ | |
b03efcfb | 194 | if (skb_queue_empty(&self->txq) || self->remote_busy) { |
1da177e4 LT |
195 | if (self->fast_RR == TRUE) { |
196 | /* | |
197 | * Assert that the fast poll timer has not reached the | |
198 | * normal poll timer yet | |
199 | */ | |
200 | if (self->fast_RR_timeout < timeout) { | |
201 | /* | |
202 | * FIXME: this should be a more configurable | |
203 | * function | |
204 | */ | |
205 | self->fast_RR_timeout += | |
206 | (sysctl_fast_poll_increase * HZ/1000); | |
207 | ||
208 | /* Use this fast(er) timeout instead */ | |
209 | timeout = self->fast_RR_timeout; | |
210 | } | |
211 | } else { | |
212 | self->fast_RR = TRUE; | |
213 | ||
214 | /* Start with just 0 ms */ | |
215 | self->fast_RR_timeout = 0; | |
216 | timeout = 0; | |
217 | } | |
218 | } else | |
219 | self->fast_RR = FALSE; | |
220 | ||
955a9d20 | 221 | pr_debug("%s(), timeout=%d (%ld)\n", __func__, timeout, jiffies); |
1da177e4 LT |
222 | #endif /* CONFIG_IRDA_FAST_RR */ |
223 | ||
224 | if (timeout == 0) | |
225 | irlap_do_event(self, POLL_TIMER_EXPIRED, NULL, NULL); | |
226 | else | |
227 | irda_start_timer(&self->poll_timer, timeout, self, | |
228 | irlap_poll_timer_expired); | |
229 | } | |
230 | ||
231 | /* | |
232 | * Function irlap_do_event (event, skb, info) | |
233 | * | |
234 | * Rushes through the state machine without any delay. If state == XMIT | |
235 | * then send queued data frames. | |
236 | */ | |
237 | void irlap_do_event(struct irlap_cb *self, IRLAP_EVENT event, | |
238 | struct sk_buff *skb, struct irlap_info *info) | |
239 | { | |
240 | int ret; | |
241 | ||
242 | if (!self || self->magic != LAP_MAGIC) | |
243 | return; | |
244 | ||
955a9d20 JP |
245 | pr_debug("%s(), event = %s, state = %s\n", __func__, |
246 | irlap_event[event], irlap_state[self->state]); | |
1da177e4 LT |
247 | |
248 | ret = (*state[self->state])(self, event, skb, info); | |
249 | ||
250 | /* | |
251 | * Check if there are any pending events that needs to be executed | |
252 | */ | |
253 | switch (self->state) { | |
254 | case LAP_XMIT_P: /* FALLTHROUGH */ | |
255 | case LAP_XMIT_S: | |
256 | /* | |
257 | * We just received the pf bit and are at the beginning | |
258 | * of a new LAP transmit window. | |
259 | * Check if there are any queued data frames, and do not | |
260 | * try to disconnect link if we send any data frames, since | |
261 | * that will change the state away form XMIT | |
262 | */ | |
955a9d20 JP |
263 | pr_debug("%s() : queue len = %d\n", __func__, |
264 | skb_queue_len(&self->txq)); | |
1da177e4 | 265 | |
b03efcfb | 266 | if (!skb_queue_empty(&self->txq)) { |
1da177e4 LT |
267 | /* Prevent race conditions with irlap_data_request() */ |
268 | self->local_busy = TRUE; | |
269 | ||
270 | /* Theory of operation. | |
271 | * We send frames up to when we fill the window or | |
272 | * reach line capacity. Those frames will queue up | |
273 | * in the device queue, and the driver will slowly | |
274 | * send them. | |
275 | * After each frame that we send, we poll the higher | |
276 | * layer for more data. It's the right time to do | |
277 | * that because the link layer need to perform the mtt | |
278 | * and then send the first frame, so we can afford | |
279 | * to send a bit of time in kernel space. | |
280 | * The explicit flow indication allow to minimise | |
281 | * buffers (== lower latency), to avoid higher layer | |
282 | * polling via timers (== less context switches) and | |
283 | * to implement a crude scheduler - Jean II */ | |
284 | ||
285 | /* Try to send away all queued data frames */ | |
286 | while ((skb = skb_dequeue(&self->txq)) != NULL) { | |
287 | /* Send one frame */ | |
288 | ret = (*state[self->state])(self, SEND_I_CMD, | |
289 | skb, NULL); | |
290 | /* Drop reference count. | |
291 | * It will be increase as needed in | |
292 | * irlap_send_data_xxx() */ | |
293 | kfree_skb(skb); | |
294 | ||
295 | /* Poll the higher layers for one more frame */ | |
296 | irlmp_flow_indication(self->notify.instance, | |
297 | FLOW_START); | |
298 | ||
299 | if (ret == -EPROTO) | |
300 | break; /* Try again later! */ | |
301 | } | |
302 | /* Finished transmitting */ | |
303 | self->local_busy = FALSE; | |
304 | } else if (self->disconnect_pending) { | |
305 | self->disconnect_pending = FALSE; | |
306 | ||
307 | ret = (*state[self->state])(self, DISCONNECT_REQUEST, | |
308 | NULL, NULL); | |
309 | } | |
310 | break; | |
311 | /* case LAP_NDM: */ | |
312 | /* case LAP_CONN: */ | |
313 | /* case LAP_RESET_WAIT: */ | |
314 | /* case LAP_RESET_CHECK: */ | |
315 | default: | |
316 | break; | |
317 | } | |
318 | } | |
319 | ||
1da177e4 LT |
320 | /* |
321 | * Function irlap_state_ndm (event, skb, frame) | |
322 | * | |
323 | * NDM (Normal Disconnected Mode) state | |
324 | * | |
325 | */ | |
326 | static int irlap_state_ndm(struct irlap_cb *self, IRLAP_EVENT event, | |
327 | struct sk_buff *skb, struct irlap_info *info) | |
328 | { | |
329 | discovery_t *discovery_rsp; | |
330 | int ret = 0; | |
331 | ||
332 | IRDA_ASSERT(self != NULL, return -1;); | |
333 | IRDA_ASSERT(self->magic == LAP_MAGIC, return -1;); | |
334 | ||
335 | switch (event) { | |
336 | case CONNECT_REQUEST: | |
337 | IRDA_ASSERT(self->netdev != NULL, return -1;); | |
338 | ||
339 | if (self->media_busy) { | |
340 | /* Note : this will never happen, because we test | |
341 | * media busy in irlap_connect_request() and | |
342 | * postpone the event... - Jean II */ | |
955a9d20 JP |
343 | pr_debug("%s(), CONNECT_REQUEST: media busy!\n", |
344 | __func__); | |
1da177e4 LT |
345 | |
346 | /* Always switch state before calling upper layers */ | |
347 | irlap_next_state(self, LAP_NDM); | |
348 | ||
349 | irlap_disconnect_indication(self, LAP_MEDIA_BUSY); | |
350 | } else { | |
351 | irlap_send_snrm_frame(self, &self->qos_rx); | |
352 | ||
353 | /* Start Final-bit timer */ | |
354 | irlap_start_final_timer(self, self->final_timeout); | |
355 | ||
356 | self->retry_count = 0; | |
357 | irlap_next_state(self, LAP_SETUP); | |
358 | } | |
359 | break; | |
360 | case RECV_SNRM_CMD: | |
361 | /* Check if the frame contains and I field */ | |
362 | if (info) { | |
363 | self->daddr = info->daddr; | |
364 | self->caddr = info->caddr; | |
365 | ||
366 | irlap_next_state(self, LAP_CONN); | |
367 | ||
368 | irlap_connect_indication(self, skb); | |
369 | } else { | |
955a9d20 JP |
370 | pr_debug("%s(), SNRM frame does not contain an I field!\n", |
371 | __func__); | |
1da177e4 LT |
372 | } |
373 | break; | |
374 | case DISCOVERY_REQUEST: | |
375 | IRDA_ASSERT(info != NULL, return -1;); | |
376 | ||
377 | if (self->media_busy) { | |
955a9d20 JP |
378 | pr_debug("%s(), DISCOVERY_REQUEST: media busy!\n", |
379 | __func__); | |
1da177e4 LT |
380 | /* irlap->log.condition = MEDIA_BUSY; */ |
381 | ||
382 | /* This will make IrLMP try again */ | |
383 | irlap_discovery_confirm(self, NULL); | |
384 | /* Note : the discovery log is not cleaned up here, | |
385 | * it will be done in irlap_discovery_request() | |
386 | * Jean II */ | |
387 | return 0; | |
388 | } | |
389 | ||
390 | self->S = info->S; | |
391 | self->s = info->s; | |
392 | irlap_send_discovery_xid_frame(self, info->S, info->s, TRUE, | |
393 | info->discovery); | |
394 | self->frame_sent = FALSE; | |
395 | self->s++; | |
396 | ||
397 | irlap_start_slot_timer(self, self->slot_timeout); | |
398 | irlap_next_state(self, LAP_QUERY); | |
399 | break; | |
400 | case RECV_DISCOVERY_XID_CMD: | |
401 | IRDA_ASSERT(info != NULL, return -1;); | |
402 | ||
403 | /* Assert that this is not the final slot */ | |
404 | if (info->s <= info->S) { | |
405 | self->slot = irlap_generate_rand_time_slot(info->S, | |
406 | info->s); | |
407 | if (self->slot == info->s) { | |
408 | discovery_rsp = irlmp_get_discovery_response(); | |
409 | discovery_rsp->data.daddr = info->daddr; | |
410 | ||
411 | irlap_send_discovery_xid_frame(self, info->S, | |
412 | self->slot, | |
413 | FALSE, | |
414 | discovery_rsp); | |
415 | self->frame_sent = TRUE; | |
416 | } else | |
417 | self->frame_sent = FALSE; | |
418 | ||
419 | /* | |
420 | * Go to reply state until end of discovery to | |
421 | * inhibit our own transmissions. Set the timer | |
422 | * to not stay forever there... Jean II | |
423 | */ | |
424 | irlap_start_query_timer(self, info->S, info->s); | |
425 | irlap_next_state(self, LAP_REPLY); | |
426 | } else { | |
427 | /* This is the final slot. How is it possible ? | |
428 | * This would happen is both discoveries are just slightly | |
429 | * offset (if they are in sync, all packets are lost). | |
430 | * Most often, all the discovery requests will be received | |
431 | * in QUERY state (see my comment there), except for the | |
432 | * last frame that will come here. | |
433 | * The big trouble when it happen is that active discovery | |
434 | * doesn't happen, because nobody answer the discoveries | |
435 | * frame of the other guy, so the log shows up empty. | |
436 | * What should we do ? | |
437 | * Not much. It's too late to answer those discovery frames, | |
438 | * so we just pass the info to IrLMP who will put it in the | |
439 | * log (and post an event). | |
440 | * Another cause would be devices that do discovery much | |
441 | * slower than us, however the latest fixes should minimise | |
442 | * those cases... | |
443 | * Jean II | |
444 | */ | |
955a9d20 JP |
445 | pr_debug("%s(), Receiving final discovery request, missed the discovery slots :-(\n", |
446 | __func__); | |
1da177e4 LT |
447 | |
448 | /* Last discovery request -> in the log */ | |
449 | irlap_discovery_indication(self, info->discovery); | |
450 | } | |
451 | break; | |
452 | case MEDIA_BUSY_TIMER_EXPIRED: | |
453 | /* A bunch of events may be postponed because the media is | |
454 | * busy (usually immediately after we close a connection), | |
455 | * or while we are doing discovery (state query/reply). | |
456 | * In all those cases, the media busy flag will be cleared | |
457 | * when it's OK for us to process those postponed events. | |
458 | * This event is not mentioned in the state machines in the | |
459 | * IrLAP spec. It's because they didn't consider Ultra and | |
460 | * postponing connection request is optional. | |
461 | * Jean II */ | |
462 | #ifdef CONFIG_IRDA_ULTRA | |
463 | /* Send any pending Ultra frames if any */ | |
464 | if (!skb_queue_empty(&self->txq_ultra)) { | |
465 | /* We don't send the frame, just post an event. | |
466 | * Also, previously this code was in timer.c... | |
467 | * Jean II */ | |
468 | ret = (*state[self->state])(self, SEND_UI_FRAME, | |
469 | NULL, NULL); | |
470 | } | |
471 | #endif /* CONFIG_IRDA_ULTRA */ | |
472 | /* Check if we should try to connect. | |
473 | * This code was previously in irlap_do_event() */ | |
474 | if (self->connect_pending) { | |
475 | self->connect_pending = FALSE; | |
476 | ||
477 | /* This one *should* not pend in this state, except | |
478 | * if a socket try to connect and immediately | |
479 | * disconnect. - clear - Jean II */ | |
480 | if (self->disconnect_pending) | |
481 | irlap_disconnect_indication(self, LAP_DISC_INDICATION); | |
482 | else | |
483 | ret = (*state[self->state])(self, | |
484 | CONNECT_REQUEST, | |
485 | NULL, NULL); | |
486 | self->disconnect_pending = FALSE; | |
487 | } | |
488 | /* Note : one way to test if this code works well (including | |
489 | * media busy and small busy) is to create a user space | |
490 | * application generating an Ultra packet every 3.05 sec (or | |
491 | * 2.95 sec) and to see how it interact with discovery. | |
492 | * It's fairly easy to check that no packet is lost, that the | |
493 | * packets are postponed during discovery and that after | |
494 | * discovery indication you have a 100ms "gap". | |
495 | * As connection request and Ultra are now processed the same | |
496 | * way, this avoid the tedious job of trying IrLAP connection | |
497 | * in all those cases... | |
498 | * Jean II */ | |
499 | break; | |
500 | #ifdef CONFIG_IRDA_ULTRA | |
501 | case SEND_UI_FRAME: | |
502 | { | |
503 | int i; | |
504 | /* Only allowed to repeat an operation twice */ | |
505 | for (i=0; ((i<2) && (self->media_busy == FALSE)); i++) { | |
506 | skb = skb_dequeue(&self->txq_ultra); | |
507 | if (skb) | |
508 | irlap_send_ui_frame(self, skb, CBROADCAST, | |
509 | CMD_FRAME); | |
510 | else | |
511 | break; | |
512 | /* irlap_send_ui_frame() won't increase skb reference | |
513 | * count, so no dev_kfree_skb() - Jean II */ | |
514 | } | |
515 | if (i == 2) { | |
516 | /* Force us to listen 500 ms again */ | |
517 | irda_device_set_media_busy(self->netdev, TRUE); | |
518 | } | |
519 | break; | |
520 | } | |
521 | case RECV_UI_FRAME: | |
522 | /* Only accept broadcast frames in NDM mode */ | |
523 | if (info->caddr != CBROADCAST) { | |
955a9d20 JP |
524 | pr_debug("%s(), not a broadcast frame!\n", |
525 | __func__); | |
1da177e4 LT |
526 | } else |
527 | irlap_unitdata_indication(self, skb); | |
528 | break; | |
529 | #endif /* CONFIG_IRDA_ULTRA */ | |
530 | case RECV_TEST_CMD: | |
531 | /* Remove test frame header */ | |
532 | skb_pull(skb, sizeof(struct test_frame)); | |
533 | ||
534 | /* | |
535 | * Send response. This skb will not be sent out again, and | |
536 | * will only be used to send out the same info as the cmd | |
537 | */ | |
538 | irlap_send_test_frame(self, CBROADCAST, info->daddr, skb); | |
539 | break; | |
540 | case RECV_TEST_RSP: | |
955a9d20 | 541 | pr_debug("%s() not implemented!\n", __func__); |
1da177e4 LT |
542 | break; |
543 | default: | |
955a9d20 JP |
544 | pr_debug("%s(), Unknown event %s\n", __func__, |
545 | irlap_event[event]); | |
1da177e4 LT |
546 | |
547 | ret = -1; | |
548 | break; | |
549 | } | |
550 | return ret; | |
551 | } | |
552 | ||
553 | /* | |
554 | * Function irlap_state_query (event, skb, info) | |
555 | * | |
556 | * QUERY state | |
557 | * | |
558 | */ | |
559 | static int irlap_state_query(struct irlap_cb *self, IRLAP_EVENT event, | |
560 | struct sk_buff *skb, struct irlap_info *info) | |
561 | { | |
562 | int ret = 0; | |
563 | ||
564 | IRDA_ASSERT(self != NULL, return -1;); | |
565 | IRDA_ASSERT(self->magic == LAP_MAGIC, return -1;); | |
566 | ||
567 | switch (event) { | |
568 | case RECV_DISCOVERY_XID_RSP: | |
569 | IRDA_ASSERT(info != NULL, return -1;); | |
570 | IRDA_ASSERT(info->discovery != NULL, return -1;); | |
571 | ||
955a9d20 JP |
572 | pr_debug("%s(), daddr=%08x\n", __func__, |
573 | info->discovery->data.daddr); | |
1da177e4 LT |
574 | |
575 | if (!self->discovery_log) { | |
6c91023d JP |
576 | net_warn_ratelimited("%s: discovery log is gone! maybe the discovery timeout has been set too short?\n", |
577 | __func__); | |
1da177e4 LT |
578 | break; |
579 | } | |
580 | hashbin_insert(self->discovery_log, | |
581 | (irda_queue_t *) info->discovery, | |
582 | info->discovery->data.daddr, NULL); | |
583 | ||
584 | /* Keep state */ | |
585 | /* irlap_next_state(self, LAP_QUERY); */ | |
586 | ||
587 | break; | |
588 | case RECV_DISCOVERY_XID_CMD: | |
589 | /* Yes, it is possible to receive those frames in this mode. | |
590 | * Note that most often the last discovery request won't | |
591 | * occur here but in NDM state (see my comment there). | |
592 | * What should we do ? | |
593 | * Not much. We are currently performing our own discovery, | |
594 | * therefore we can't answer those frames. We don't want | |
595 | * to change state either. We just pass the info to | |
596 | * IrLMP who will put it in the log (and post an event). | |
597 | * Jean II | |
598 | */ | |
599 | ||
600 | IRDA_ASSERT(info != NULL, return -1;); | |
601 | ||
955a9d20 JP |
602 | pr_debug("%s(), Receiving discovery request (s = %d) while performing discovery :-(\n", |
603 | __func__, info->s); | |
1da177e4 LT |
604 | |
605 | /* Last discovery request ? */ | |
606 | if (info->s == 0xff) | |
607 | irlap_discovery_indication(self, info->discovery); | |
608 | break; | |
609 | case SLOT_TIMER_EXPIRED: | |
610 | /* | |
611 | * Wait a little longer if we detect an incoming frame. This | |
612 | * is not mentioned in the spec, but is a good thing to do, | |
613 | * since we want to work even with devices that violate the | |
614 | * timing requirements. | |
615 | */ | |
616 | if (irda_device_is_receiving(self->netdev) && !self->add_wait) { | |
955a9d20 JP |
617 | pr_debug("%s(), device is slow to answer, waiting some more!\n", |
618 | __func__); | |
1da177e4 LT |
619 | irlap_start_slot_timer(self, msecs_to_jiffies(10)); |
620 | self->add_wait = TRUE; | |
621 | return ret; | |
622 | } | |
623 | self->add_wait = FALSE; | |
624 | ||
625 | if (self->s < self->S) { | |
626 | irlap_send_discovery_xid_frame(self, self->S, | |
627 | self->s, TRUE, | |
628 | self->discovery_cmd); | |
629 | self->s++; | |
630 | irlap_start_slot_timer(self, self->slot_timeout); | |
631 | ||
632 | /* Keep state */ | |
633 | irlap_next_state(self, LAP_QUERY); | |
634 | } else { | |
635 | /* This is the final slot! */ | |
636 | irlap_send_discovery_xid_frame(self, self->S, 0xff, | |
637 | TRUE, | |
638 | self->discovery_cmd); | |
639 | ||
640 | /* Always switch state before calling upper layers */ | |
641 | irlap_next_state(self, LAP_NDM); | |
642 | ||
643 | /* | |
644 | * We are now finished with the discovery procedure, | |
645 | * so now we must return the results | |
646 | */ | |
647 | irlap_discovery_confirm(self, self->discovery_log); | |
648 | ||
649 | /* IrLMP should now have taken care of the log */ | |
650 | self->discovery_log = NULL; | |
651 | } | |
652 | break; | |
653 | default: | |
955a9d20 JP |
654 | pr_debug("%s(), Unknown event %s\n", __func__, |
655 | irlap_event[event]); | |
1da177e4 LT |
656 | |
657 | ret = -1; | |
658 | break; | |
659 | } | |
660 | return ret; | |
661 | } | |
662 | ||
663 | /* | |
664 | * Function irlap_state_reply (self, event, skb, info) | |
665 | * | |
666 | * REPLY, we have received a XID discovery frame from a device and we | |
667 | * are waiting for the right time slot to send a response XID frame | |
668 | * | |
669 | */ | |
670 | static int irlap_state_reply(struct irlap_cb *self, IRLAP_EVENT event, | |
671 | struct sk_buff *skb, struct irlap_info *info) | |
672 | { | |
673 | discovery_t *discovery_rsp; | |
674 | int ret=0; | |
675 | ||
1da177e4 LT |
676 | IRDA_ASSERT(self != NULL, return -1;); |
677 | IRDA_ASSERT(self->magic == LAP_MAGIC, return -1;); | |
678 | ||
679 | switch (event) { | |
680 | case QUERY_TIMER_EXPIRED: | |
955a9d20 JP |
681 | pr_debug("%s(), QUERY_TIMER_EXPIRED <%ld>\n", |
682 | __func__, jiffies); | |
1da177e4 LT |
683 | irlap_next_state(self, LAP_NDM); |
684 | break; | |
685 | case RECV_DISCOVERY_XID_CMD: | |
686 | IRDA_ASSERT(info != NULL, return -1;); | |
687 | /* Last frame? */ | |
688 | if (info->s == 0xff) { | |
689 | del_timer(&self->query_timer); | |
690 | ||
691 | /* info->log.condition = REMOTE; */ | |
692 | ||
693 | /* Always switch state before calling upper layers */ | |
694 | irlap_next_state(self, LAP_NDM); | |
695 | ||
696 | irlap_discovery_indication(self, info->discovery); | |
697 | } else { | |
698 | /* If it's our slot, send our reply */ | |
699 | if ((info->s >= self->slot) && (!self->frame_sent)) { | |
700 | discovery_rsp = irlmp_get_discovery_response(); | |
701 | discovery_rsp->data.daddr = info->daddr; | |
702 | ||
703 | irlap_send_discovery_xid_frame(self, info->S, | |
704 | self->slot, | |
705 | FALSE, | |
706 | discovery_rsp); | |
707 | ||
708 | self->frame_sent = TRUE; | |
709 | } | |
25985edc | 710 | /* Readjust our timer to accommodate devices |
1da177e4 LT |
711 | * doing faster or slower discovery than us... |
712 | * Jean II */ | |
713 | irlap_start_query_timer(self, info->S, info->s); | |
714 | ||
715 | /* Keep state */ | |
716 | //irlap_next_state(self, LAP_REPLY); | |
717 | } | |
718 | break; | |
719 | default: | |
955a9d20 JP |
720 | pr_debug("%s(), Unknown event %d, %s\n", __func__, |
721 | event, irlap_event[event]); | |
1da177e4 LT |
722 | |
723 | ret = -1; | |
724 | break; | |
725 | } | |
726 | return ret; | |
727 | } | |
728 | ||
729 | /* | |
730 | * Function irlap_state_conn (event, skb, info) | |
731 | * | |
732 | * CONN, we have received a SNRM command and is waiting for the upper | |
733 | * layer to accept or refuse connection | |
734 | * | |
735 | */ | |
736 | static int irlap_state_conn(struct irlap_cb *self, IRLAP_EVENT event, | |
737 | struct sk_buff *skb, struct irlap_info *info) | |
738 | { | |
739 | int ret = 0; | |
740 | ||
955a9d20 | 741 | pr_debug("%s(), event=%s\n", __func__, irlap_event[event]); |
1da177e4 LT |
742 | |
743 | IRDA_ASSERT(self != NULL, return -1;); | |
744 | IRDA_ASSERT(self->magic == LAP_MAGIC, return -1;); | |
745 | ||
746 | switch (event) { | |
747 | case CONNECT_RESPONSE: | |
748 | skb_pull(skb, sizeof(struct snrm_frame)); | |
749 | ||
750 | IRDA_ASSERT(self->netdev != NULL, return -1;); | |
751 | ||
752 | irlap_qos_negotiate(self, skb); | |
753 | ||
754 | irlap_initiate_connection_state(self); | |
755 | ||
756 | /* | |
757 | * Applying the parameters now will make sure we change speed | |
758 | * *after* we have sent the next frame | |
759 | */ | |
760 | irlap_apply_connection_parameters(self, FALSE); | |
761 | ||
762 | /* | |
763 | * Sending this frame will force a speed change after it has | |
764 | * been sent (i.e. the frame will be sent at 9600). | |
765 | */ | |
766 | irlap_send_ua_response_frame(self, &self->qos_rx); | |
767 | ||
768 | #if 0 | |
769 | /* | |
770 | * We are allowed to send two frames, but this may increase | |
771 | * the connect latency, so lets not do it for now. | |
772 | */ | |
773 | /* This is full of good intentions, but doesn't work in | |
774 | * practice. | |
775 | * After sending the first UA response, we switch the | |
776 | * dongle to the negotiated speed, which is usually | |
777 | * different than 9600 kb/s. | |
778 | * From there, there is two solutions : | |
779 | * 1) The other end has received the first UA response : | |
780 | * it will set up the connection, move to state LAP_NRM_P, | |
781 | * and will ignore and drop the second UA response. | |
782 | * Actually, it's even worse : the other side will almost | |
783 | * immediately send a RR that will likely collide with the | |
784 | * UA response (depending on negotiated turnaround). | |
785 | * 2) The other end has not received the first UA response, | |
786 | * will stay at 9600 and will never see the second UA response. | |
787 | * Jean II */ | |
788 | irlap_send_ua_response_frame(self, &self->qos_rx); | |
789 | #endif | |
790 | ||
791 | /* | |
792 | * The WD-timer could be set to the duration of the P-timer | |
793 | * for this case, but it is recommended to use twice the | |
794 | * value (note 3 IrLAP p. 60). | |
795 | */ | |
796 | irlap_start_wd_timer(self, self->wd_timeout); | |
797 | irlap_next_state(self, LAP_NRM_S); | |
798 | ||
799 | break; | |
800 | case RECV_DISCOVERY_XID_CMD: | |
955a9d20 JP |
801 | pr_debug("%s(), event RECV_DISCOVER_XID_CMD!\n", |
802 | __func__); | |
1da177e4 LT |
803 | irlap_next_state(self, LAP_NDM); |
804 | ||
805 | break; | |
806 | case DISCONNECT_REQUEST: | |
955a9d20 | 807 | pr_debug("%s(), Disconnect request!\n", __func__); |
1da177e4 LT |
808 | irlap_send_dm_frame(self); |
809 | irlap_next_state( self, LAP_NDM); | |
810 | irlap_disconnect_indication(self, LAP_DISC_INDICATION); | |
811 | break; | |
812 | default: | |
955a9d20 JP |
813 | pr_debug("%s(), Unknown event %d, %s\n", __func__, |
814 | event, irlap_event[event]); | |
1da177e4 LT |
815 | |
816 | ret = -1; | |
817 | break; | |
818 | } | |
819 | ||
820 | return ret; | |
821 | } | |
822 | ||
823 | /* | |
824 | * Function irlap_state_setup (event, skb, frame) | |
825 | * | |
826 | * SETUP state, The local layer has transmitted a SNRM command frame to | |
827 | * a remote peer layer and is awaiting a reply . | |
828 | * | |
829 | */ | |
830 | static int irlap_state_setup(struct irlap_cb *self, IRLAP_EVENT event, | |
831 | struct sk_buff *skb, struct irlap_info *info) | |
832 | { | |
833 | int ret = 0; | |
834 | ||
1da177e4 LT |
835 | IRDA_ASSERT(self != NULL, return -1;); |
836 | IRDA_ASSERT(self->magic == LAP_MAGIC, return -1;); | |
837 | ||
838 | switch (event) { | |
839 | case FINAL_TIMER_EXPIRED: | |
840 | if (self->retry_count < self->N3) { | |
841 | /* | |
842 | * Perform random backoff, Wait a random number of time units, minimum | |
843 | * duration half the time taken to transmitt a SNRM frame, maximum duration | |
844 | * 1.5 times the time taken to transmit a SNRM frame. So this time should | |
845 | * between 15 msecs and 45 msecs. | |
846 | */ | |
847 | irlap_start_backoff_timer(self, msecs_to_jiffies(20 + | |
6819bc2e | 848 | (jiffies % 30))); |
1da177e4 LT |
849 | } else { |
850 | /* Always switch state before calling upper layers */ | |
851 | irlap_next_state(self, LAP_NDM); | |
852 | ||
853 | irlap_disconnect_indication(self, LAP_FOUND_NONE); | |
854 | } | |
855 | break; | |
856 | case BACKOFF_TIMER_EXPIRED: | |
857 | irlap_send_snrm_frame(self, &self->qos_rx); | |
858 | irlap_start_final_timer(self, self->final_timeout); | |
859 | self->retry_count++; | |
860 | break; | |
861 | case RECV_SNRM_CMD: | |
955a9d20 | 862 | pr_debug("%s(), SNRM battle!\n", __func__); |
1da177e4 LT |
863 | |
864 | IRDA_ASSERT(skb != NULL, return 0;); | |
865 | IRDA_ASSERT(info != NULL, return 0;); | |
866 | ||
867 | /* | |
868 | * The device with the largest device address wins the battle | |
869 | * (both have sent a SNRM command!) | |
870 | */ | |
871 | if (info &&(info->daddr > self->saddr)) { | |
872 | del_timer(&self->final_timer); | |
873 | irlap_initiate_connection_state(self); | |
874 | ||
875 | IRDA_ASSERT(self->netdev != NULL, return -1;); | |
876 | ||
877 | skb_pull(skb, sizeof(struct snrm_frame)); | |
878 | ||
879 | irlap_qos_negotiate(self, skb); | |
880 | ||
881 | /* Send UA frame and then change link settings */ | |
882 | irlap_apply_connection_parameters(self, FALSE); | |
883 | irlap_send_ua_response_frame(self, &self->qos_rx); | |
884 | ||
885 | irlap_next_state(self, LAP_NRM_S); | |
886 | irlap_connect_confirm(self, skb); | |
887 | ||
888 | /* | |
889 | * The WD-timer could be set to the duration of the | |
890 | * P-timer for this case, but it is recommended | |
891 | * to use twice the value (note 3 IrLAP p. 60). | |
892 | */ | |
893 | irlap_start_wd_timer(self, self->wd_timeout); | |
894 | } else { | |
895 | /* We just ignore the other device! */ | |
896 | irlap_next_state(self, LAP_SETUP); | |
897 | } | |
898 | break; | |
899 | case RECV_UA_RSP: | |
900 | /* Stop F-timer */ | |
901 | del_timer(&self->final_timer); | |
902 | ||
903 | /* Initiate connection state */ | |
904 | irlap_initiate_connection_state(self); | |
905 | ||
906 | /* Negotiate connection parameters */ | |
907 | IRDA_ASSERT(skb->len > 10, return -1;); | |
908 | ||
909 | skb_pull(skb, sizeof(struct ua_frame)); | |
910 | ||
911 | IRDA_ASSERT(self->netdev != NULL, return -1;); | |
912 | ||
913 | irlap_qos_negotiate(self, skb); | |
914 | ||
915 | /* Set the new link setting *now* (before the rr frame) */ | |
916 | irlap_apply_connection_parameters(self, TRUE); | |
917 | self->retry_count = 0; | |
918 | ||
919 | /* Wait for turnaround time to give a chance to the other | |
920 | * device to be ready to receive us. | |
921 | * Note : the time to switch speed is typically larger | |
922 | * than the turnaround time, but as we don't have the other | |
923 | * side speed switch time, that's our best guess... | |
924 | * Jean II */ | |
925 | irlap_wait_min_turn_around(self, &self->qos_tx); | |
926 | ||
927 | /* This frame will actually be sent at the new speed */ | |
928 | irlap_send_rr_frame(self, CMD_FRAME); | |
929 | ||
930 | /* The timer is set to half the normal timer to quickly | |
25985edc | 931 | * detect a failure to negotiate the new connection |
1da177e4 LT |
932 | * parameters. IrLAP 6.11.3.2, note 3. |
933 | * Note that currently we don't process this failure | |
934 | * properly, as we should do a quick disconnect. | |
935 | * Jean II */ | |
936 | irlap_start_final_timer(self, self->final_timeout/2); | |
937 | irlap_next_state(self, LAP_NRM_P); | |
938 | ||
939 | irlap_connect_confirm(self, skb); | |
940 | break; | |
941 | case RECV_DM_RSP: /* FALLTHROUGH */ | |
942 | case RECV_DISC_CMD: | |
943 | del_timer(&self->final_timer); | |
944 | irlap_next_state(self, LAP_NDM); | |
945 | ||
946 | irlap_disconnect_indication(self, LAP_DISC_INDICATION); | |
947 | break; | |
948 | default: | |
955a9d20 JP |
949 | pr_debug("%s(), Unknown event %d, %s\n", __func__, |
950 | event, irlap_event[event]); | |
1da177e4 LT |
951 | |
952 | ret = -1; | |
953 | break; | |
954 | } | |
955 | return ret; | |
956 | } | |
957 | ||
958 | /* | |
959 | * Function irlap_state_offline (self, event, skb, info) | |
960 | * | |
961 | * OFFLINE state, not used for now! | |
962 | * | |
963 | */ | |
964 | static int irlap_state_offline(struct irlap_cb *self, IRLAP_EVENT event, | |
965 | struct sk_buff *skb, struct irlap_info *info) | |
966 | { | |
955a9d20 | 967 | pr_debug("%s(), Unknown event\n", __func__); |
1da177e4 LT |
968 | |
969 | return -1; | |
970 | } | |
971 | ||
972 | /* | |
973 | * Function irlap_state_xmit_p (self, event, skb, info) | |
974 | * | |
975 | * XMIT, Only the primary station has right to transmit, and we | |
976 | * therefore do not expect to receive any transmissions from other | |
977 | * stations. | |
978 | * | |
979 | */ | |
980 | static int irlap_state_xmit_p(struct irlap_cb *self, IRLAP_EVENT event, | |
981 | struct sk_buff *skb, struct irlap_info *info) | |
982 | { | |
983 | int ret = 0; | |
984 | ||
985 | switch (event) { | |
986 | case SEND_I_CMD: | |
987 | /* | |
988 | * Only send frame if send-window > 0. | |
989 | */ | |
990 | if ((self->window > 0) && (!self->remote_busy)) { | |
991 | int nextfit; | |
992 | #ifdef CONFIG_IRDA_DYNAMIC_WINDOW | |
993 | struct sk_buff *skb_next; | |
994 | ||
995 | /* With DYNAMIC_WINDOW, we keep the window size | |
996 | * maximum, and adapt on the packets we are sending. | |
997 | * At 115k, we can send only 2 packets of 2048 bytes | |
998 | * in a 500 ms turnaround. Without this option, we | |
999 | * would always limit the window to 2. With this | |
1000 | * option, if we send smaller packets, we can send | |
1001 | * up to 7 of them (always depending on QoS). | |
1002 | * Jean II */ | |
1003 | ||
1004 | /* Look at the next skb. This is safe, as we are | |
1005 | * the only consumer of the Tx queue (if we are not, | |
1006 | * we have other problems) - Jean II */ | |
1007 | skb_next = skb_peek(&self->txq); | |
1008 | ||
1009 | /* Check if a subsequent skb exist and would fit in | |
1010 | * the current window (with respect to turnaround | |
1011 | * time). | |
1012 | * This allow us to properly mark the current packet | |
1013 | * with the pf bit, to avoid falling back on the | |
1014 | * second test below, and avoid waiting the | |
1015 | * end of the window and sending a extra RR. | |
1016 | * Note : (skb_next != NULL) <=> (skb_queue_len() > 0) | |
1017 | * Jean II */ | |
1018 | nextfit = ((skb_next != NULL) && | |
1019 | ((skb_next->len + skb->len) <= | |
1020 | self->bytes_left)); | |
1021 | ||
1022 | /* | |
1023 | * The current packet may not fit ! Because of test | |
1024 | * above, this should not happen any more !!! | |
1025 | * Test if we have transmitted more bytes over the | |
1026 | * link than its possible to do with the current | |
1027 | * speed and turn-around-time. | |
1028 | */ | |
1029 | if((!nextfit) && (skb->len > self->bytes_left)) { | |
955a9d20 JP |
1030 | pr_debug("%s(), Not allowed to transmit more bytes!\n", |
1031 | __func__); | |
1da177e4 LT |
1032 | /* Requeue the skb */ |
1033 | skb_queue_head(&self->txq, skb_get(skb)); | |
1034 | /* | |
1035 | * We should switch state to LAP_NRM_P, but | |
1036 | * that is not possible since we must be sure | |
1037 | * that we poll the other side. Since we have | |
1038 | * used up our time, the poll timer should | |
1039 | * trigger anyway now, so we just wait for it | |
1040 | * DB | |
1041 | */ | |
1042 | /* | |
1043 | * Sorry, but that's not totally true. If | |
1044 | * we send 2000B packets, we may wait another | |
1045 | * 1000B until our turnaround expire. That's | |
1046 | * why we need to be proactive in avoiding | |
1047 | * coming here. - Jean II | |
1048 | */ | |
1049 | return -EPROTO; | |
1050 | } | |
1051 | ||
25985edc | 1052 | /* Subtract space used by this skb */ |
1da177e4 LT |
1053 | self->bytes_left -= skb->len; |
1054 | #else /* CONFIG_IRDA_DYNAMIC_WINDOW */ | |
1055 | /* Window has been adjusted for the max packet | |
1056 | * size, so much simpler... - Jean II */ | |
b03efcfb | 1057 | nextfit = !skb_queue_empty(&self->txq); |
1da177e4 LT |
1058 | #endif /* CONFIG_IRDA_DYNAMIC_WINDOW */ |
1059 | /* | |
1060 | * Send data with poll bit cleared only if window > 1 | |
1061 | * and there is more frames after this one to be sent | |
1062 | */ | |
1063 | if ((self->window > 1) && (nextfit)) { | |
1064 | /* More packet to send in current window */ | |
1065 | irlap_send_data_primary(self, skb); | |
1066 | irlap_next_state(self, LAP_XMIT_P); | |
1067 | } else { | |
1068 | /* Final packet of window */ | |
1069 | irlap_send_data_primary_poll(self, skb); | |
1da177e4 LT |
1070 | |
1071 | /* | |
1072 | * Make sure state machine does not try to send | |
1073 | * any more frames | |
1074 | */ | |
1075 | ret = -EPROTO; | |
1076 | } | |
1077 | #ifdef CONFIG_IRDA_FAST_RR | |
1078 | /* Peer may want to reply immediately */ | |
1079 | self->fast_RR = FALSE; | |
1080 | #endif /* CONFIG_IRDA_FAST_RR */ | |
1081 | } else { | |
955a9d20 JP |
1082 | pr_debug("%s(), Unable to send! remote busy?\n", |
1083 | __func__); | |
1da177e4 LT |
1084 | skb_queue_head(&self->txq, skb_get(skb)); |
1085 | ||
1086 | /* | |
1087 | * The next ret is important, because it tells | |
1088 | * irlap_next_state _not_ to deliver more frames | |
1089 | */ | |
1090 | ret = -EPROTO; | |
1091 | } | |
1092 | break; | |
1093 | case POLL_TIMER_EXPIRED: | |
955a9d20 JP |
1094 | pr_debug("%s(), POLL_TIMER_EXPIRED <%ld>\n", |
1095 | __func__, jiffies); | |
1da177e4 LT |
1096 | irlap_send_rr_frame(self, CMD_FRAME); |
1097 | /* Return to NRM properly - Jean II */ | |
1098 | self->window = self->window_size; | |
1099 | #ifdef CONFIG_IRDA_DYNAMIC_WINDOW | |
1100 | /* Allowed to transmit a maximum number of bytes again. */ | |
1101 | self->bytes_left = self->line_capacity; | |
1102 | #endif /* CONFIG_IRDA_DYNAMIC_WINDOW */ | |
1103 | irlap_start_final_timer(self, self->final_timeout); | |
1104 | irlap_next_state(self, LAP_NRM_P); | |
1105 | break; | |
1106 | case DISCONNECT_REQUEST: | |
1107 | del_timer(&self->poll_timer); | |
1108 | irlap_wait_min_turn_around(self, &self->qos_tx); | |
1109 | irlap_send_disc_frame(self); | |
1110 | irlap_flush_all_queues(self); | |
1111 | irlap_start_final_timer(self, self->final_timeout); | |
1112 | self->retry_count = 0; | |
1113 | irlap_next_state(self, LAP_PCLOSE); | |
1114 | break; | |
1115 | case DATA_REQUEST: | |
1116 | /* Nothing to do, irlap_do_event() will send the packet | |
1117 | * when we return... - Jean II */ | |
1118 | break; | |
1119 | default: | |
955a9d20 JP |
1120 | pr_debug("%s(), Unknown event %s\n", |
1121 | __func__, irlap_event[event]); | |
1da177e4 LT |
1122 | |
1123 | ret = -EINVAL; | |
1124 | break; | |
1125 | } | |
1126 | return ret; | |
1127 | } | |
1128 | ||
1129 | /* | |
1130 | * Function irlap_state_pclose (event, skb, info) | |
1131 | * | |
1132 | * PCLOSE state | |
1133 | */ | |
1134 | static int irlap_state_pclose(struct irlap_cb *self, IRLAP_EVENT event, | |
1135 | struct sk_buff *skb, struct irlap_info *info) | |
1136 | { | |
1137 | int ret = 0; | |
1138 | ||
1da177e4 LT |
1139 | IRDA_ASSERT(self != NULL, return -1;); |
1140 | IRDA_ASSERT(self->magic == LAP_MAGIC, return -1;); | |
1141 | ||
1142 | switch (event) { | |
1143 | case RECV_UA_RSP: /* FALLTHROUGH */ | |
1144 | case RECV_DM_RSP: | |
1145 | del_timer(&self->final_timer); | |
1146 | ||
1147 | /* Set new link parameters */ | |
1148 | irlap_apply_default_connection_parameters(self); | |
1149 | ||
1150 | /* Always switch state before calling upper layers */ | |
1151 | irlap_next_state(self, LAP_NDM); | |
1152 | ||
1153 | irlap_disconnect_indication(self, LAP_DISC_INDICATION); | |
1154 | break; | |
1155 | case FINAL_TIMER_EXPIRED: | |
1156 | if (self->retry_count < self->N3) { | |
1157 | irlap_wait_min_turn_around(self, &self->qos_tx); | |
1158 | irlap_send_disc_frame(self); | |
1159 | irlap_start_final_timer(self, self->final_timeout); | |
1160 | self->retry_count++; | |
1161 | /* Keep state */ | |
1162 | } else { | |
1163 | irlap_apply_default_connection_parameters(self); | |
1164 | ||
1165 | /* Always switch state before calling upper layers */ | |
1166 | irlap_next_state(self, LAP_NDM); | |
1167 | ||
1168 | irlap_disconnect_indication(self, LAP_NO_RESPONSE); | |
1169 | } | |
1170 | break; | |
1171 | default: | |
955a9d20 | 1172 | pr_debug("%s(), Unknown event %d\n", __func__, event); |
1da177e4 LT |
1173 | |
1174 | ret = -1; | |
1175 | break; | |
1176 | } | |
1177 | return ret; | |
1178 | } | |
1179 | ||
1180 | /* | |
1181 | * Function irlap_state_nrm_p (self, event, skb, info) | |
1182 | * | |
1183 | * NRM_P (Normal Response Mode as Primary), The primary station has given | |
1184 | * permissions to a secondary station to transmit IrLAP resonse frames | |
1185 | * (by sending a frame with the P bit set). The primary station will not | |
1186 | * transmit any frames and is expecting to receive frames only from the | |
1187 | * secondary to which transmission permissions has been given. | |
1188 | */ | |
1189 | static int irlap_state_nrm_p(struct irlap_cb *self, IRLAP_EVENT event, | |
1190 | struct sk_buff *skb, struct irlap_info *info) | |
1191 | { | |
1192 | int ret = 0; | |
1193 | int ns_status; | |
1194 | int nr_status; | |
1195 | ||
1196 | switch (event) { | |
1197 | case RECV_I_RSP: /* Optimize for the common case */ | |
5d780cd6 RB |
1198 | if (unlikely(skb->len <= LAP_ADDR_HEADER + LAP_CTRL_HEADER)) { |
1199 | /* | |
1200 | * Input validation check: a stir4200/mcp2150 | |
1201 | * combination sometimes results in an empty i:rsp. | |
1202 | * This makes no sense; we can just ignore the frame | |
1203 | * and send an rr:cmd immediately. This happens before | |
1204 | * changing nr or ns so triggers a retransmit | |
1205 | */ | |
1206 | irlap_wait_min_turn_around(self, &self->qos_tx); | |
1207 | irlap_send_rr_frame(self, CMD_FRAME); | |
1208 | /* Keep state */ | |
1209 | break; | |
1210 | } | |
1da177e4 LT |
1211 | /* FIXME: must check for remote_busy below */ |
1212 | #ifdef CONFIG_IRDA_FAST_RR | |
1213 | /* | |
1214 | * Reset the fast_RR so we can use the fast RR code with | |
1215 | * full speed the next time since peer may have more frames | |
1216 | * to transmitt | |
1217 | */ | |
1218 | self->fast_RR = FALSE; | |
1219 | #endif /* CONFIG_IRDA_FAST_RR */ | |
1220 | IRDA_ASSERT( info != NULL, return -1;); | |
1221 | ||
1222 | ns_status = irlap_validate_ns_received(self, info->ns); | |
1223 | nr_status = irlap_validate_nr_received(self, info->nr); | |
1224 | ||
1225 | /* | |
1226 | * Check for expected I(nformation) frame | |
1227 | */ | |
1228 | if ((ns_status == NS_EXPECTED) && (nr_status == NR_EXPECTED)) { | |
1229 | ||
1230 | /* Update Vr (next frame for us to receive) */ | |
1231 | self->vr = (self->vr + 1) % 8; | |
1232 | ||
1233 | /* Update Nr received, cleanup our retry queue */ | |
1234 | irlap_update_nr_received(self, info->nr); | |
1235 | ||
1236 | /* | |
1237 | * Got expected NR, so reset the | |
1238 | * retry_count. This is not done by IrLAP spec, | |
1239 | * which is strange! | |
1240 | */ | |
1241 | self->retry_count = 0; | |
1242 | self->ack_required = TRUE; | |
1243 | ||
1244 | /* poll bit cleared? */ | |
1245 | if (!info->pf) { | |
1246 | /* Keep state, do not move this line */ | |
1247 | irlap_next_state(self, LAP_NRM_P); | |
1248 | ||
1249 | irlap_data_indication(self, skb, FALSE); | |
1250 | } else { | |
1251 | /* No longer waiting for pf */ | |
1252 | del_timer(&self->final_timer); | |
1253 | ||
1254 | irlap_wait_min_turn_around(self, &self->qos_tx); | |
1255 | ||
1256 | /* Call higher layer *before* changing state | |
1257 | * to give them a chance to send data in the | |
1258 | * next LAP frame. | |
1259 | * Jean II */ | |
1260 | irlap_data_indication(self, skb, FALSE); | |
1261 | ||
1262 | /* XMIT states are the most dangerous state | |
1263 | * to be in, because user requests are | |
1264 | * processed directly and may change state. | |
1265 | * On the other hand, in NDM_P, those | |
1266 | * requests are queued and we will process | |
1267 | * them when we return to irlap_do_event(). | |
1268 | * Jean II | |
1269 | */ | |
1270 | irlap_next_state(self, LAP_XMIT_P); | |
1271 | ||
1272 | /* This is the last frame. | |
1273 | * Make sure it's always called in XMIT state. | |
1274 | * - Jean II */ | |
1275 | irlap_start_poll_timer(self, self->poll_timeout); | |
1276 | } | |
1277 | break; | |
1278 | ||
1279 | } | |
1280 | /* Unexpected next to send (Ns) */ | |
1281 | if ((ns_status == NS_UNEXPECTED) && (nr_status == NR_EXPECTED)) | |
1282 | { | |
1283 | if (!info->pf) { | |
1284 | irlap_update_nr_received(self, info->nr); | |
1285 | ||
1286 | /* | |
1287 | * Wait until the last frame before doing | |
1288 | * anything | |
1289 | */ | |
1290 | ||
1291 | /* Keep state */ | |
1292 | irlap_next_state(self, LAP_NRM_P); | |
1293 | } else { | |
955a9d20 JP |
1294 | pr_debug("%s(), missing or duplicate frame!\n", |
1295 | __func__); | |
1da177e4 LT |
1296 | |
1297 | /* Update Nr received */ | |
1298 | irlap_update_nr_received(self, info->nr); | |
1299 | ||
1300 | irlap_wait_min_turn_around(self, &self->qos_tx); | |
1301 | irlap_send_rr_frame(self, CMD_FRAME); | |
1302 | ||
1303 | self->ack_required = FALSE; | |
1304 | ||
1305 | irlap_start_final_timer(self, self->final_timeout); | |
1306 | irlap_next_state(self, LAP_NRM_P); | |
1307 | } | |
1308 | break; | |
1309 | } | |
1310 | /* | |
1311 | * Unexpected next to receive (Nr) | |
1312 | */ | |
1313 | if ((ns_status == NS_EXPECTED) && (nr_status == NR_UNEXPECTED)) | |
1314 | { | |
1315 | if (info->pf) { | |
1316 | self->vr = (self->vr + 1) % 8; | |
1317 | ||
1318 | /* Update Nr received */ | |
1319 | irlap_update_nr_received(self, info->nr); | |
1320 | ||
1321 | /* Resend rejected frames */ | |
1322 | irlap_resend_rejected_frames(self, CMD_FRAME); | |
1323 | ||
1324 | self->ack_required = FALSE; | |
1325 | ||
1326 | /* Make sure we account for the time | |
1327 | * to transmit our frames. See comemnts | |
1328 | * in irlap_send_data_primary_poll(). | |
1329 | * Jean II */ | |
1330 | irlap_start_final_timer(self, 2 * self->final_timeout); | |
1331 | ||
1332 | /* Keep state, do not move this line */ | |
1333 | irlap_next_state(self, LAP_NRM_P); | |
1334 | ||
1335 | irlap_data_indication(self, skb, FALSE); | |
1336 | } else { | |
1337 | /* | |
1338 | * Do not resend frames until the last | |
1339 | * frame has arrived from the other | |
1340 | * device. This is not documented in | |
1341 | * IrLAP!! | |
1342 | */ | |
1343 | self->vr = (self->vr + 1) % 8; | |
1344 | ||
1345 | /* Update Nr received */ | |
1346 | irlap_update_nr_received(self, info->nr); | |
1347 | ||
1348 | self->ack_required = FALSE; | |
1349 | ||
1350 | /* Keep state, do not move this line!*/ | |
1351 | irlap_next_state(self, LAP_NRM_P); | |
1352 | ||
1353 | irlap_data_indication(self, skb, FALSE); | |
1354 | } | |
1355 | break; | |
1356 | } | |
1357 | /* | |
1358 | * Unexpected next to send (Ns) and next to receive (Nr) | |
1359 | * Not documented by IrLAP! | |
1360 | */ | |
1361 | if ((ns_status == NS_UNEXPECTED) && | |
1362 | (nr_status == NR_UNEXPECTED)) | |
1363 | { | |
955a9d20 JP |
1364 | pr_debug("%s(), unexpected nr and ns!\n", |
1365 | __func__); | |
1da177e4 LT |
1366 | if (info->pf) { |
1367 | /* Resend rejected frames */ | |
1368 | irlap_resend_rejected_frames(self, CMD_FRAME); | |
1369 | ||
6819bc2e | 1370 | /* Give peer some time to retransmit! |
1da177e4 LT |
1371 | * But account for our own Tx. */ |
1372 | irlap_start_final_timer(self, 2 * self->final_timeout); | |
1373 | ||
1374 | /* Keep state, do not move this line */ | |
1375 | irlap_next_state(self, LAP_NRM_P); | |
1376 | } else { | |
1377 | /* Update Nr received */ | |
1378 | /* irlap_update_nr_received( info->nr); */ | |
1379 | ||
1380 | self->ack_required = FALSE; | |
1381 | } | |
1382 | break; | |
1383 | } | |
1384 | ||
1385 | /* | |
1386 | * Invalid NR or NS | |
1387 | */ | |
1388 | if ((nr_status == NR_INVALID) || (ns_status == NS_INVALID)) { | |
1389 | if (info->pf) { | |
1390 | del_timer(&self->final_timer); | |
1391 | ||
1392 | irlap_next_state(self, LAP_RESET_WAIT); | |
1393 | ||
1394 | irlap_disconnect_indication(self, LAP_RESET_INDICATION); | |
1395 | self->xmitflag = TRUE; | |
1396 | } else { | |
1397 | del_timer(&self->final_timer); | |
1398 | ||
1399 | irlap_disconnect_indication(self, LAP_RESET_INDICATION); | |
1400 | ||
1401 | self->xmitflag = FALSE; | |
1402 | } | |
1403 | break; | |
1404 | } | |
955a9d20 JP |
1405 | pr_debug("%s(), Not implemented!\n", __func__); |
1406 | pr_debug("%s(), event=%s, ns_status=%d, nr_status=%d\n", | |
1407 | __func__, irlap_event[event], ns_status, nr_status); | |
1da177e4 LT |
1408 | break; |
1409 | case RECV_UI_FRAME: | |
1410 | /* Poll bit cleared? */ | |
1411 | if (!info->pf) { | |
1412 | irlap_data_indication(self, skb, TRUE); | |
1413 | irlap_next_state(self, LAP_NRM_P); | |
1414 | } else { | |
1415 | del_timer(&self->final_timer); | |
1416 | irlap_data_indication(self, skb, TRUE); | |
1417 | irlap_next_state(self, LAP_XMIT_P); | |
955a9d20 JP |
1418 | pr_debug("%s: RECV_UI_FRAME: next state %s\n", |
1419 | __func__, irlap_state[self->state]); | |
1da177e4 LT |
1420 | irlap_start_poll_timer(self, self->poll_timeout); |
1421 | } | |
1422 | break; | |
1423 | case RECV_RR_RSP: | |
1424 | /* | |
1425 | * If you get a RR, the remote isn't busy anymore, | |
1426 | * no matter what the NR | |
1427 | */ | |
1428 | self->remote_busy = FALSE; | |
1429 | ||
b7e773b8 L |
1430 | /* Stop final timer */ |
1431 | del_timer(&self->final_timer); | |
1432 | ||
1da177e4 LT |
1433 | /* |
1434 | * Nr as expected? | |
1435 | */ | |
1436 | ret = irlap_validate_nr_received(self, info->nr); | |
1437 | if (ret == NR_EXPECTED) { | |
1da177e4 LT |
1438 | /* Update Nr received */ |
1439 | irlap_update_nr_received(self, info->nr); | |
1440 | ||
1441 | /* | |
1442 | * Got expected NR, so reset the retry_count. This | |
1443 | * is not done by the IrLAP standard , which is | |
1444 | * strange! DB. | |
1445 | */ | |
1446 | self->retry_count = 0; | |
1447 | irlap_wait_min_turn_around(self, &self->qos_tx); | |
1448 | ||
1449 | irlap_next_state(self, LAP_XMIT_P); | |
1450 | ||
1451 | /* Start poll timer */ | |
1452 | irlap_start_poll_timer(self, self->poll_timeout); | |
1453 | } else if (ret == NR_UNEXPECTED) { | |
1454 | IRDA_ASSERT(info != NULL, return -1;); | |
1455 | /* | |
1456 | * Unexpected nr! | |
1457 | */ | |
1458 | ||
1459 | /* Update Nr received */ | |
1460 | irlap_update_nr_received(self, info->nr); | |
1461 | ||
955a9d20 JP |
1462 | pr_debug("RECV_RR_FRAME: Retrans:%d, nr=%d, va=%d, vs=%d, vr=%d\n", |
1463 | self->retry_count, info->nr, self->va, | |
1464 | self->vs, self->vr); | |
1da177e4 LT |
1465 | |
1466 | /* Resend rejected frames */ | |
1467 | irlap_resend_rejected_frames(self, CMD_FRAME); | |
b7e773b8 | 1468 | irlap_start_final_timer(self, self->final_timeout * 2); |
1da177e4 LT |
1469 | |
1470 | irlap_next_state(self, LAP_NRM_P); | |
1471 | } else if (ret == NR_INVALID) { | |
955a9d20 JP |
1472 | pr_debug("%s(), Received RR with invalid nr !\n", |
1473 | __func__); | |
1da177e4 LT |
1474 | |
1475 | irlap_next_state(self, LAP_RESET_WAIT); | |
1476 | ||
1477 | irlap_disconnect_indication(self, LAP_RESET_INDICATION); | |
1478 | self->xmitflag = TRUE; | |
1479 | } | |
1480 | break; | |
1481 | case RECV_RNR_RSP: | |
1482 | IRDA_ASSERT(info != NULL, return -1;); | |
1483 | ||
1484 | /* Stop final timer */ | |
1485 | del_timer(&self->final_timer); | |
1486 | self->remote_busy = TRUE; | |
1487 | ||
1488 | /* Update Nr received */ | |
1489 | irlap_update_nr_received(self, info->nr); | |
1490 | irlap_next_state(self, LAP_XMIT_P); | |
1491 | ||
1492 | /* Start poll timer */ | |
1493 | irlap_start_poll_timer(self, self->poll_timeout); | |
1494 | break; | |
1495 | case RECV_FRMR_RSP: | |
1496 | del_timer(&self->final_timer); | |
1497 | self->xmitflag = TRUE; | |
1498 | irlap_next_state(self, LAP_RESET_WAIT); | |
1499 | irlap_reset_indication(self); | |
1500 | break; | |
1501 | case FINAL_TIMER_EXPIRED: | |
1502 | /* | |
1503 | * We are allowed to wait for additional 300 ms if | |
1504 | * final timer expires when we are in the middle | |
1505 | * of receiving a frame (page 45, IrLAP). Check that | |
1506 | * we only do this once for each frame. | |
1507 | */ | |
1508 | if (irda_device_is_receiving(self->netdev) && !self->add_wait) { | |
955a9d20 | 1509 | pr_debug("FINAL_TIMER_EXPIRED when receiving a frame! Waiting a little bit more!\n"); |
1da177e4 LT |
1510 | irlap_start_final_timer(self, msecs_to_jiffies(300)); |
1511 | ||
1512 | /* | |
1513 | * Don't allow this to happen one more time in a row, | |
1514 | * or else we can get a pretty tight loop here if | |
1515 | * if we only receive half a frame. DB. | |
1516 | */ | |
1517 | self->add_wait = TRUE; | |
1518 | break; | |
1519 | } | |
1520 | self->add_wait = FALSE; | |
1521 | ||
1522 | /* N2 is the disconnect timer. Until we reach it, we retry */ | |
1523 | if (self->retry_count < self->N2) { | |
6d97b53e RB |
1524 | if (skb_peek(&self->wx_list) == NULL) { |
1525 | /* Retry sending the pf bit to the secondary */ | |
955a9d20 | 1526 | pr_debug("nrm_p: resending rr"); |
6d97b53e RB |
1527 | irlap_wait_min_turn_around(self, &self->qos_tx); |
1528 | irlap_send_rr_frame(self, CMD_FRAME); | |
1529 | } else { | |
955a9d20 | 1530 | pr_debug("nrm_p: resend frames"); |
6d97b53e RB |
1531 | irlap_resend_rejected_frames(self, CMD_FRAME); |
1532 | } | |
1da177e4 LT |
1533 | |
1534 | irlap_start_final_timer(self, self->final_timeout); | |
1535 | self->retry_count++; | |
955a9d20 JP |
1536 | pr_debug("irlap_state_nrm_p: FINAL_TIMER_EXPIRED: retry_count=%d\n", |
1537 | self->retry_count); | |
1da177e4 LT |
1538 | |
1539 | /* Early warning event. I'm using a pretty liberal | |
1540 | * interpretation of the spec and generate an event | |
1541 | * every time the timer is multiple of N1 (and not | |
1542 | * only the first time). This allow application | |
1543 | * to know precisely if connectivity restart... | |
1544 | * Jean II */ | |
1545 | if((self->retry_count % self->N1) == 0) | |
1546 | irlap_status_indication(self, | |
1547 | STATUS_NO_ACTIVITY); | |
1548 | ||
1549 | /* Keep state */ | |
1550 | } else { | |
1551 | irlap_apply_default_connection_parameters(self); | |
1552 | ||
1553 | /* Always switch state before calling upper layers */ | |
1554 | irlap_next_state(self, LAP_NDM); | |
1555 | irlap_disconnect_indication(self, LAP_NO_RESPONSE); | |
1556 | } | |
1557 | break; | |
1558 | case RECV_REJ_RSP: | |
1559 | irlap_update_nr_received(self, info->nr); | |
1560 | if (self->remote_busy) { | |
1561 | irlap_wait_min_turn_around(self, &self->qos_tx); | |
1562 | irlap_send_rr_frame(self, CMD_FRAME); | |
1563 | } else | |
1564 | irlap_resend_rejected_frames(self, CMD_FRAME); | |
1565 | irlap_start_final_timer(self, 2 * self->final_timeout); | |
1566 | break; | |
1567 | case RECV_SREJ_RSP: | |
1568 | irlap_update_nr_received(self, info->nr); | |
1569 | if (self->remote_busy) { | |
1570 | irlap_wait_min_turn_around(self, &self->qos_tx); | |
1571 | irlap_send_rr_frame(self, CMD_FRAME); | |
1572 | } else | |
1573 | irlap_resend_rejected_frame(self, CMD_FRAME); | |
1574 | irlap_start_final_timer(self, 2 * self->final_timeout); | |
1575 | break; | |
1576 | case RECV_RD_RSP: | |
955a9d20 | 1577 | pr_debug("%s(), RECV_RD_RSP\n", __func__); |
1da177e4 LT |
1578 | |
1579 | irlap_flush_all_queues(self); | |
1580 | irlap_next_state(self, LAP_XMIT_P); | |
1581 | /* Call back the LAP state machine to do a proper disconnect */ | |
1582 | irlap_disconnect_request(self); | |
1583 | break; | |
1584 | default: | |
955a9d20 JP |
1585 | pr_debug("%s(), Unknown event %s\n", |
1586 | __func__, irlap_event[event]); | |
1da177e4 LT |
1587 | |
1588 | ret = -1; | |
1589 | break; | |
1590 | } | |
1591 | return ret; | |
1592 | } | |
1593 | ||
1594 | /* | |
1595 | * Function irlap_state_reset_wait (event, skb, info) | |
1596 | * | |
1597 | * We have informed the service user of a reset condition, and is | |
1598 | * awaiting reset of disconnect request. | |
1599 | * | |
1600 | */ | |
1601 | static int irlap_state_reset_wait(struct irlap_cb *self, IRLAP_EVENT event, | |
1602 | struct sk_buff *skb, struct irlap_info *info) | |
1603 | { | |
1604 | int ret = 0; | |
1605 | ||
955a9d20 | 1606 | pr_debug("%s(), event = %s\n", __func__, irlap_event[event]); |
1da177e4 LT |
1607 | |
1608 | IRDA_ASSERT(self != NULL, return -1;); | |
1609 | IRDA_ASSERT(self->magic == LAP_MAGIC, return -1;); | |
1610 | ||
1611 | switch (event) { | |
1612 | case RESET_REQUEST: | |
1613 | if (self->xmitflag) { | |
1614 | irlap_wait_min_turn_around(self, &self->qos_tx); | |
1615 | irlap_send_snrm_frame(self, NULL); | |
1616 | irlap_start_final_timer(self, self->final_timeout); | |
1617 | irlap_next_state(self, LAP_RESET); | |
1618 | } else { | |
1619 | irlap_start_final_timer(self, self->final_timeout); | |
1620 | irlap_next_state(self, LAP_RESET); | |
1621 | } | |
1622 | break; | |
1623 | case DISCONNECT_REQUEST: | |
1624 | irlap_wait_min_turn_around( self, &self->qos_tx); | |
1625 | irlap_send_disc_frame( self); | |
1626 | irlap_flush_all_queues( self); | |
1627 | irlap_start_final_timer( self, self->final_timeout); | |
1628 | self->retry_count = 0; | |
1629 | irlap_next_state( self, LAP_PCLOSE); | |
1630 | break; | |
1631 | default: | |
955a9d20 JP |
1632 | pr_debug("%s(), Unknown event %s\n", __func__, |
1633 | irlap_event[event]); | |
1da177e4 LT |
1634 | |
1635 | ret = -1; | |
1636 | break; | |
1637 | } | |
1638 | return ret; | |
1639 | } | |
1640 | ||
1641 | /* | |
1642 | * Function irlap_state_reset (self, event, skb, info) | |
1643 | * | |
1644 | * We have sent a SNRM reset command to the peer layer, and is awaiting | |
1645 | * reply. | |
1646 | * | |
1647 | */ | |
1648 | static int irlap_state_reset(struct irlap_cb *self, IRLAP_EVENT event, | |
1649 | struct sk_buff *skb, struct irlap_info *info) | |
1650 | { | |
1651 | int ret = 0; | |
1652 | ||
955a9d20 | 1653 | pr_debug("%s(), event = %s\n", __func__, irlap_event[event]); |
1da177e4 LT |
1654 | |
1655 | IRDA_ASSERT(self != NULL, return -1;); | |
1656 | IRDA_ASSERT(self->magic == LAP_MAGIC, return -1;); | |
1657 | ||
1658 | switch (event) { | |
1659 | case RECV_DISC_CMD: | |
1660 | del_timer(&self->final_timer); | |
1661 | ||
1662 | irlap_apply_default_connection_parameters(self); | |
1663 | ||
1664 | /* Always switch state before calling upper layers */ | |
1665 | irlap_next_state(self, LAP_NDM); | |
1666 | ||
1667 | irlap_disconnect_indication(self, LAP_NO_RESPONSE); | |
1668 | ||
1669 | break; | |
1670 | case RECV_UA_RSP: | |
1671 | del_timer(&self->final_timer); | |
1672 | ||
1673 | /* Initiate connection state */ | |
1674 | irlap_initiate_connection_state(self); | |
1675 | ||
1676 | irlap_reset_confirm(); | |
1677 | ||
1678 | self->remote_busy = FALSE; | |
1679 | ||
1680 | irlap_next_state(self, LAP_XMIT_P); | |
1681 | ||
1682 | irlap_start_poll_timer(self, self->poll_timeout); | |
1683 | ||
1684 | break; | |
1685 | case FINAL_TIMER_EXPIRED: | |
1686 | if (self->retry_count < 3) { | |
1687 | irlap_wait_min_turn_around(self, &self->qos_tx); | |
1688 | ||
1689 | IRDA_ASSERT(self->netdev != NULL, return -1;); | |
1690 | irlap_send_snrm_frame(self, self->qos_dev); | |
1691 | ||
1692 | self->retry_count++; /* Experimental!! */ | |
1693 | ||
1694 | irlap_start_final_timer(self, self->final_timeout); | |
1695 | irlap_next_state(self, LAP_RESET); | |
1696 | } else if (self->retry_count >= self->N3) { | |
1697 | irlap_apply_default_connection_parameters(self); | |
1698 | ||
1699 | /* Always switch state before calling upper layers */ | |
1700 | irlap_next_state(self, LAP_NDM); | |
1701 | ||
1702 | irlap_disconnect_indication(self, LAP_NO_RESPONSE); | |
1703 | } | |
1704 | break; | |
1705 | case RECV_SNRM_CMD: | |
1706 | /* | |
1707 | * SNRM frame is not allowed to contain an I-field in this | |
1708 | * state | |
1709 | */ | |
1710 | if (!info) { | |
955a9d20 | 1711 | pr_debug("%s(), RECV_SNRM_CMD\n", __func__); |
1da177e4 LT |
1712 | irlap_initiate_connection_state(self); |
1713 | irlap_wait_min_turn_around(self, &self->qos_tx); | |
1714 | irlap_send_ua_response_frame(self, &self->qos_rx); | |
1715 | irlap_reset_confirm(); | |
1716 | irlap_start_wd_timer(self, self->wd_timeout); | |
1717 | irlap_next_state(self, LAP_NDM); | |
1718 | } else { | |
955a9d20 JP |
1719 | pr_debug("%s(), SNRM frame contained an I field!\n", |
1720 | __func__); | |
1da177e4 LT |
1721 | } |
1722 | break; | |
1723 | default: | |
955a9d20 JP |
1724 | pr_debug("%s(), Unknown event %s\n", |
1725 | __func__, irlap_event[event]); | |
1da177e4 LT |
1726 | |
1727 | ret = -1; | |
1728 | break; | |
1729 | } | |
1730 | return ret; | |
1731 | } | |
1732 | ||
1733 | /* | |
1734 | * Function irlap_state_xmit_s (event, skb, info) | |
1735 | * | |
1736 | * XMIT_S, The secondary station has been given the right to transmit, | |
af901ca1 | 1737 | * and we therefore do not expect to receive any transmissions from other |
1da177e4 LT |
1738 | * stations. |
1739 | */ | |
1740 | static int irlap_state_xmit_s(struct irlap_cb *self, IRLAP_EVENT event, | |
1741 | struct sk_buff *skb, struct irlap_info *info) | |
1742 | { | |
1743 | int ret = 0; | |
1744 | ||
955a9d20 | 1745 | pr_debug("%s(), event=%s\n", __func__, irlap_event[event]); |
1da177e4 LT |
1746 | |
1747 | IRDA_ASSERT(self != NULL, return -ENODEV;); | |
1748 | IRDA_ASSERT(self->magic == LAP_MAGIC, return -EBADR;); | |
1749 | ||
1750 | switch (event) { | |
1751 | case SEND_I_CMD: | |
1752 | /* | |
1753 | * Send frame only if send window > 0 | |
1754 | */ | |
1755 | if ((self->window > 0) && (!self->remote_busy)) { | |
1756 | int nextfit; | |
1757 | #ifdef CONFIG_IRDA_DYNAMIC_WINDOW | |
1758 | struct sk_buff *skb_next; | |
1759 | ||
1760 | /* | |
1761 | * Same deal as in irlap_state_xmit_p(), so see | |
1762 | * the comments at that point. | |
1763 | * We are the secondary, so there are only subtle | |
1764 | * differences. - Jean II | |
1765 | */ | |
1766 | ||
1767 | /* Check if a subsequent skb exist and would fit in | |
1768 | * the current window (with respect to turnaround | |
1769 | * time). - Jean II */ | |
1770 | skb_next = skb_peek(&self->txq); | |
1771 | nextfit = ((skb_next != NULL) && | |
1772 | ((skb_next->len + skb->len) <= | |
1773 | self->bytes_left)); | |
1774 | ||
1775 | /* | |
1776 | * Test if we have transmitted more bytes over the | |
1777 | * link than its possible to do with the current | |
1778 | * speed and turn-around-time. | |
1779 | */ | |
1780 | if((!nextfit) && (skb->len > self->bytes_left)) { | |
955a9d20 JP |
1781 | pr_debug("%s(), Not allowed to transmit more bytes!\n", |
1782 | __func__); | |
1da177e4 LT |
1783 | /* Requeue the skb */ |
1784 | skb_queue_head(&self->txq, skb_get(skb)); | |
1785 | ||
1786 | /* | |
1787 | * Switch to NRM_S, this is only possible | |
1788 | * when we are in secondary mode, since we | |
1789 | * must be sure that we don't miss any RR | |
1790 | * frames | |
1791 | */ | |
1792 | self->window = self->window_size; | |
1793 | self->bytes_left = self->line_capacity; | |
1794 | irlap_start_wd_timer(self, self->wd_timeout); | |
1795 | ||
1796 | irlap_next_state(self, LAP_NRM_S); | |
1797 | /* Slight difference with primary : | |
1798 | * here we would wait for the other side to | |
1799 | * expire the turnaround. - Jean II */ | |
1800 | ||
1801 | return -EPROTO; /* Try again later */ | |
1802 | } | |
25985edc | 1803 | /* Subtract space used by this skb */ |
1da177e4 LT |
1804 | self->bytes_left -= skb->len; |
1805 | #else /* CONFIG_IRDA_DYNAMIC_WINDOW */ | |
1806 | /* Window has been adjusted for the max packet | |
1807 | * size, so much simpler... - Jean II */ | |
b03efcfb | 1808 | nextfit = !skb_queue_empty(&self->txq); |
1da177e4 LT |
1809 | #endif /* CONFIG_IRDA_DYNAMIC_WINDOW */ |
1810 | /* | |
1811 | * Send data with final bit cleared only if window > 1 | |
1812 | * and there is more frames to be sent | |
1813 | */ | |
1814 | if ((self->window > 1) && (nextfit)) { | |
1815 | irlap_send_data_secondary(self, skb); | |
1816 | irlap_next_state(self, LAP_XMIT_S); | |
1817 | } else { | |
1818 | irlap_send_data_secondary_final(self, skb); | |
1819 | irlap_next_state(self, LAP_NRM_S); | |
1820 | ||
1821 | /* | |
1822 | * Make sure state machine does not try to send | |
1823 | * any more frames | |
1824 | */ | |
1825 | ret = -EPROTO; | |
1826 | } | |
1827 | } else { | |
955a9d20 | 1828 | pr_debug("%s(), Unable to send!\n", __func__); |
1da177e4 LT |
1829 | skb_queue_head(&self->txq, skb_get(skb)); |
1830 | ret = -EPROTO; | |
1831 | } | |
1832 | break; | |
1833 | case DISCONNECT_REQUEST: | |
1834 | irlap_send_rd_frame(self); | |
1835 | irlap_flush_all_queues(self); | |
1836 | irlap_start_wd_timer(self, self->wd_timeout); | |
1837 | irlap_next_state(self, LAP_SCLOSE); | |
1838 | break; | |
1839 | case DATA_REQUEST: | |
1840 | /* Nothing to do, irlap_do_event() will send the packet | |
1841 | * when we return... - Jean II */ | |
1842 | break; | |
1843 | default: | |
955a9d20 JP |
1844 | pr_debug("%s(), Unknown event %s\n", __func__, |
1845 | irlap_event[event]); | |
1da177e4 LT |
1846 | |
1847 | ret = -EINVAL; | |
1848 | break; | |
1849 | } | |
1850 | return ret; | |
1851 | } | |
1852 | ||
1853 | /* | |
1854 | * Function irlap_state_nrm_s (event, skb, info) | |
1855 | * | |
1856 | * NRM_S (Normal Response Mode as Secondary) state, in this state we are | |
1857 | * expecting to receive frames from the primary station | |
1858 | * | |
1859 | */ | |
1860 | static int irlap_state_nrm_s(struct irlap_cb *self, IRLAP_EVENT event, | |
1861 | struct sk_buff *skb, struct irlap_info *info) | |
1862 | { | |
1863 | int ns_status; | |
1864 | int nr_status; | |
1865 | int ret = 0; | |
1866 | ||
955a9d20 | 1867 | pr_debug("%s(), event=%s\n", __func__, irlap_event[event]); |
1da177e4 LT |
1868 | |
1869 | IRDA_ASSERT(self != NULL, return -1;); | |
1870 | IRDA_ASSERT(self->magic == LAP_MAGIC, return -1;); | |
1871 | ||
1872 | switch (event) { | |
1873 | case RECV_I_CMD: /* Optimize for the common case */ | |
1874 | /* FIXME: must check for remote_busy below */ | |
955a9d20 JP |
1875 | pr_debug("%s(), event=%s nr=%d, vs=%d, ns=%d, vr=%d, pf=%d\n", |
1876 | __func__, irlap_event[event], info->nr, | |
1877 | self->vs, info->ns, self->vr, info->pf); | |
1da177e4 LT |
1878 | |
1879 | self->retry_count = 0; | |
1880 | ||
1881 | ns_status = irlap_validate_ns_received(self, info->ns); | |
1882 | nr_status = irlap_validate_nr_received(self, info->nr); | |
1883 | /* | |
1884 | * Check for expected I(nformation) frame | |
1885 | */ | |
1886 | if ((ns_status == NS_EXPECTED) && (nr_status == NR_EXPECTED)) { | |
1887 | ||
1888 | /* Update Vr (next frame for us to receive) */ | |
1889 | self->vr = (self->vr + 1) % 8; | |
1890 | ||
1891 | /* Update Nr received */ | |
1892 | irlap_update_nr_received(self, info->nr); | |
1893 | ||
1894 | /* | |
1895 | * poll bit cleared? | |
1896 | */ | |
1897 | if (!info->pf) { | |
1898 | ||
1899 | self->ack_required = TRUE; | |
1900 | ||
1901 | /* | |
1902 | * Starting WD-timer here is optional, but | |
1903 | * not recommended. Note 6 IrLAP p. 83 | |
1904 | */ | |
1905 | #if 0 | |
1906 | irda_start_timer(WD_TIMER, self->wd_timeout); | |
1907 | #endif | |
1908 | /* Keep state, do not move this line */ | |
1909 | irlap_next_state(self, LAP_NRM_S); | |
1910 | ||
1911 | irlap_data_indication(self, skb, FALSE); | |
1912 | break; | |
1913 | } else { | |
1914 | /* | |
1915 | * We should wait before sending RR, and | |
1916 | * also before changing to XMIT_S | |
1917 | * state. (note 1, IrLAP p. 82) | |
1918 | */ | |
1919 | irlap_wait_min_turn_around(self, &self->qos_tx); | |
1920 | ||
1921 | /* | |
1922 | * Give higher layers a chance to | |
1923 | * immediately reply with some data before | |
1924 | * we decide if we should send a RR frame | |
1925 | * or not | |
1926 | */ | |
1927 | irlap_data_indication(self, skb, FALSE); | |
1928 | ||
1929 | /* Any pending data requests? */ | |
b03efcfb | 1930 | if (!skb_queue_empty(&self->txq) && |
1da177e4 LT |
1931 | (self->window > 0)) |
1932 | { | |
1933 | self->ack_required = TRUE; | |
1934 | ||
1935 | del_timer(&self->wd_timer); | |
1936 | ||
1937 | irlap_next_state(self, LAP_XMIT_S); | |
1938 | } else { | |
1939 | irlap_send_rr_frame(self, RSP_FRAME); | |
1940 | irlap_start_wd_timer(self, | |
1941 | self->wd_timeout); | |
1942 | ||
1943 | /* Keep the state */ | |
1944 | irlap_next_state(self, LAP_NRM_S); | |
1945 | } | |
1946 | break; | |
1947 | } | |
1948 | } | |
1949 | /* | |
1950 | * Check for Unexpected next to send (Ns) | |
1951 | */ | |
1952 | if ((ns_status == NS_UNEXPECTED) && (nr_status == NR_EXPECTED)) | |
1953 | { | |
1954 | /* Unexpected next to send, with final bit cleared */ | |
1955 | if (!info->pf) { | |
1956 | irlap_update_nr_received(self, info->nr); | |
1957 | ||
1958 | irlap_start_wd_timer(self, self->wd_timeout); | |
1959 | } else { | |
1960 | /* Update Nr received */ | |
1961 | irlap_update_nr_received(self, info->nr); | |
1962 | ||
1963 | irlap_wait_min_turn_around(self, &self->qos_tx); | |
1964 | irlap_send_rr_frame(self, RSP_FRAME); | |
1965 | ||
1966 | irlap_start_wd_timer(self, self->wd_timeout); | |
1967 | } | |
1968 | break; | |
1969 | } | |
1970 | ||
1971 | /* | |
1972 | * Unexpected Next to Receive(NR) ? | |
1973 | */ | |
1974 | if ((ns_status == NS_EXPECTED) && (nr_status == NR_UNEXPECTED)) | |
1975 | { | |
1976 | if (info->pf) { | |
955a9d20 | 1977 | pr_debug("RECV_I_RSP: frame(s) lost\n"); |
1da177e4 LT |
1978 | |
1979 | self->vr = (self->vr + 1) % 8; | |
1980 | ||
1981 | /* Update Nr received */ | |
1982 | irlap_update_nr_received(self, info->nr); | |
1983 | ||
1984 | /* Resend rejected frames */ | |
1985 | irlap_resend_rejected_frames(self, RSP_FRAME); | |
1986 | ||
1987 | /* Keep state, do not move this line */ | |
1988 | irlap_next_state(self, LAP_NRM_S); | |
1989 | ||
1990 | irlap_data_indication(self, skb, FALSE); | |
1991 | irlap_start_wd_timer(self, self->wd_timeout); | |
1992 | break; | |
1993 | } | |
1994 | /* | |
1995 | * This is not documented in IrLAP!! Unexpected NR | |
1996 | * with poll bit cleared | |
1997 | */ | |
1998 | if (!info->pf) { | |
1999 | self->vr = (self->vr + 1) % 8; | |
2000 | ||
2001 | /* Update Nr received */ | |
2002 | irlap_update_nr_received(self, info->nr); | |
2003 | ||
2004 | /* Keep state, do not move this line */ | |
2005 | irlap_next_state(self, LAP_NRM_S); | |
2006 | ||
2007 | irlap_data_indication(self, skb, FALSE); | |
2008 | irlap_start_wd_timer(self, self->wd_timeout); | |
2009 | } | |
2010 | break; | |
2011 | } | |
2012 | ||
2013 | if (ret == NR_INVALID) { | |
955a9d20 | 2014 | pr_debug("NRM_S, NR_INVALID not implemented!\n"); |
1da177e4 LT |
2015 | } |
2016 | if (ret == NS_INVALID) { | |
955a9d20 | 2017 | pr_debug("NRM_S, NS_INVALID not implemented!\n"); |
1da177e4 LT |
2018 | } |
2019 | break; | |
2020 | case RECV_UI_FRAME: | |
2021 | /* | |
2022 | * poll bit cleared? | |
2023 | */ | |
2024 | if (!info->pf) { | |
2025 | irlap_data_indication(self, skb, TRUE); | |
2026 | irlap_next_state(self, LAP_NRM_S); /* Keep state */ | |
2027 | } else { | |
2028 | /* | |
2029 | * Any pending data requests? | |
2030 | */ | |
b03efcfb | 2031 | if (!skb_queue_empty(&self->txq) && |
1da177e4 LT |
2032 | (self->window > 0) && !self->remote_busy) |
2033 | { | |
2034 | irlap_data_indication(self, skb, TRUE); | |
2035 | ||
2036 | del_timer(&self->wd_timer); | |
2037 | ||
2038 | irlap_next_state(self, LAP_XMIT_S); | |
2039 | } else { | |
2040 | irlap_data_indication(self, skb, TRUE); | |
2041 | ||
2042 | irlap_wait_min_turn_around(self, &self->qos_tx); | |
2043 | ||
2044 | irlap_send_rr_frame(self, RSP_FRAME); | |
2045 | self->ack_required = FALSE; | |
2046 | ||
2047 | irlap_start_wd_timer(self, self->wd_timeout); | |
2048 | ||
2049 | /* Keep the state */ | |
2050 | irlap_next_state(self, LAP_NRM_S); | |
2051 | } | |
2052 | } | |
2053 | break; | |
2054 | case RECV_RR_CMD: | |
2055 | self->retry_count = 0; | |
2056 | ||
2057 | /* | |
2058 | * Nr as expected? | |
2059 | */ | |
2060 | nr_status = irlap_validate_nr_received(self, info->nr); | |
2061 | if (nr_status == NR_EXPECTED) { | |
b03efcfb | 2062 | if (!skb_queue_empty(&self->txq) && |
1da177e4 LT |
2063 | (self->window > 0)) { |
2064 | self->remote_busy = FALSE; | |
2065 | ||
2066 | /* Update Nr received */ | |
2067 | irlap_update_nr_received(self, info->nr); | |
2068 | del_timer(&self->wd_timer); | |
2069 | ||
2070 | irlap_wait_min_turn_around(self, &self->qos_tx); | |
2071 | irlap_next_state(self, LAP_XMIT_S); | |
2072 | } else { | |
2073 | self->remote_busy = FALSE; | |
2074 | /* Update Nr received */ | |
2075 | irlap_update_nr_received(self, info->nr); | |
2076 | irlap_wait_min_turn_around(self, &self->qos_tx); | |
2077 | irlap_start_wd_timer(self, self->wd_timeout); | |
2078 | ||
2079 | /* Note : if the link is idle (this case), | |
2080 | * we never go in XMIT_S, so we never get a | |
2081 | * chance to process any DISCONNECT_REQUEST. | |
2082 | * Do it now ! - Jean II */ | |
2083 | if (self->disconnect_pending) { | |
2084 | /* Disconnect */ | |
2085 | irlap_send_rd_frame(self); | |
2086 | irlap_flush_all_queues(self); | |
2087 | ||
2088 | irlap_next_state(self, LAP_SCLOSE); | |
2089 | } else { | |
2090 | /* Just send back pf bit */ | |
2091 | irlap_send_rr_frame(self, RSP_FRAME); | |
2092 | ||
2093 | irlap_next_state(self, LAP_NRM_S); | |
2094 | } | |
2095 | } | |
2096 | } else if (nr_status == NR_UNEXPECTED) { | |
2097 | self->remote_busy = FALSE; | |
2098 | irlap_update_nr_received(self, info->nr); | |
2099 | irlap_resend_rejected_frames(self, RSP_FRAME); | |
2100 | ||
2101 | irlap_start_wd_timer(self, self->wd_timeout); | |
2102 | ||
2103 | /* Keep state */ | |
2104 | irlap_next_state(self, LAP_NRM_S); | |
2105 | } else { | |
955a9d20 JP |
2106 | pr_debug("%s(), invalid nr not implemented!\n", |
2107 | __func__); | |
1da177e4 LT |
2108 | } |
2109 | break; | |
2110 | case RECV_SNRM_CMD: | |
2111 | /* SNRM frame is not allowed to contain an I-field */ | |
2112 | if (!info) { | |
2113 | del_timer(&self->wd_timer); | |
955a9d20 | 2114 | pr_debug("%s(), received SNRM cmd\n", __func__); |
1da177e4 LT |
2115 | irlap_next_state(self, LAP_RESET_CHECK); |
2116 | ||
2117 | irlap_reset_indication(self); | |
2118 | } else { | |
955a9d20 JP |
2119 | pr_debug("%s(), SNRM frame contained an I-field!\n", |
2120 | __func__); | |
1da177e4 LT |
2121 | |
2122 | } | |
2123 | break; | |
2124 | case RECV_REJ_CMD: | |
2125 | irlap_update_nr_received(self, info->nr); | |
2126 | if (self->remote_busy) { | |
2127 | irlap_wait_min_turn_around(self, &self->qos_tx); | |
2128 | irlap_send_rr_frame(self, RSP_FRAME); | |
2129 | } else | |
2130 | irlap_resend_rejected_frames(self, RSP_FRAME); | |
2131 | irlap_start_wd_timer(self, self->wd_timeout); | |
2132 | break; | |
2133 | case RECV_SREJ_CMD: | |
2134 | irlap_update_nr_received(self, info->nr); | |
2135 | if (self->remote_busy) { | |
2136 | irlap_wait_min_turn_around(self, &self->qos_tx); | |
2137 | irlap_send_rr_frame(self, RSP_FRAME); | |
2138 | } else | |
2139 | irlap_resend_rejected_frame(self, RSP_FRAME); | |
2140 | irlap_start_wd_timer(self, self->wd_timeout); | |
2141 | break; | |
2142 | case WD_TIMER_EXPIRED: | |
2143 | /* | |
2144 | * Wait until retry_count * n matches negotiated threshold/ | |
2145 | * disconnect time (note 2 in IrLAP p. 82) | |
2146 | * | |
2147 | * Similar to irlap_state_nrm_p() -> FINAL_TIMER_EXPIRED | |
2148 | * Note : self->wd_timeout = (self->final_timeout * 2), | |
2149 | * which explain why we use (self->N2 / 2) here !!! | |
2150 | * Jean II | |
2151 | */ | |
955a9d20 JP |
2152 | pr_debug("%s(), retry_count = %d\n", __func__, |
2153 | self->retry_count); | |
1da177e4 LT |
2154 | |
2155 | if (self->retry_count < (self->N2 / 2)) { | |
2156 | /* No retry, just wait for primary */ | |
2157 | irlap_start_wd_timer(self, self->wd_timeout); | |
2158 | self->retry_count++; | |
2159 | ||
2160 | if((self->retry_count % (self->N1 / 2)) == 0) | |
2161 | irlap_status_indication(self, | |
2162 | STATUS_NO_ACTIVITY); | |
2163 | } else { | |
2164 | irlap_apply_default_connection_parameters(self); | |
2165 | ||
2166 | /* Always switch state before calling upper layers */ | |
2167 | irlap_next_state(self, LAP_NDM); | |
2168 | irlap_disconnect_indication(self, LAP_NO_RESPONSE); | |
2169 | } | |
2170 | break; | |
2171 | case RECV_DISC_CMD: | |
2172 | /* Always switch state before calling upper layers */ | |
2173 | irlap_next_state(self, LAP_NDM); | |
2174 | ||
2175 | /* Send disconnect response */ | |
2176 | irlap_wait_min_turn_around(self, &self->qos_tx); | |
2177 | irlap_send_ua_response_frame(self, NULL); | |
2178 | ||
2179 | del_timer(&self->wd_timer); | |
2180 | irlap_flush_all_queues(self); | |
2181 | /* Set default link parameters */ | |
2182 | irlap_apply_default_connection_parameters(self); | |
2183 | ||
2184 | irlap_disconnect_indication(self, LAP_DISC_INDICATION); | |
2185 | break; | |
2186 | case RECV_DISCOVERY_XID_CMD: | |
2187 | irlap_wait_min_turn_around(self, &self->qos_tx); | |
2188 | irlap_send_rr_frame(self, RSP_FRAME); | |
2189 | self->ack_required = TRUE; | |
2190 | irlap_start_wd_timer(self, self->wd_timeout); | |
2191 | irlap_next_state(self, LAP_NRM_S); | |
2192 | ||
2193 | break; | |
2194 | case RECV_TEST_CMD: | |
2195 | /* Remove test frame header (only LAP header in NRM) */ | |
2196 | skb_pull(skb, LAP_ADDR_HEADER + LAP_CTRL_HEADER); | |
2197 | ||
2198 | irlap_wait_min_turn_around(self, &self->qos_tx); | |
2199 | irlap_start_wd_timer(self, self->wd_timeout); | |
2200 | ||
2201 | /* Send response (info will be copied) */ | |
2202 | irlap_send_test_frame(self, self->caddr, info->daddr, skb); | |
2203 | break; | |
2204 | default: | |
955a9d20 JP |
2205 | pr_debug("%s(), Unknown event %d, (%s)\n", __func__, |
2206 | event, irlap_event[event]); | |
1da177e4 LT |
2207 | |
2208 | ret = -EINVAL; | |
2209 | break; | |
2210 | } | |
2211 | return ret; | |
2212 | } | |
2213 | ||
2214 | /* | |
2215 | * Function irlap_state_sclose (self, event, skb, info) | |
2216 | */ | |
2217 | static int irlap_state_sclose(struct irlap_cb *self, IRLAP_EVENT event, | |
2218 | struct sk_buff *skb, struct irlap_info *info) | |
2219 | { | |
1da177e4 LT |
2220 | IRDA_ASSERT(self != NULL, return -ENODEV;); |
2221 | IRDA_ASSERT(self->magic == LAP_MAGIC, return -EBADR;); | |
2222 | ||
2223 | switch (event) { | |
2224 | case RECV_DISC_CMD: | |
2225 | /* Always switch state before calling upper layers */ | |
2226 | irlap_next_state(self, LAP_NDM); | |
2227 | ||
2228 | /* Send disconnect response */ | |
2229 | irlap_wait_min_turn_around(self, &self->qos_tx); | |
2230 | irlap_send_ua_response_frame(self, NULL); | |
2231 | ||
2232 | del_timer(&self->wd_timer); | |
2233 | /* Set default link parameters */ | |
2234 | irlap_apply_default_connection_parameters(self); | |
2235 | ||
2236 | irlap_disconnect_indication(self, LAP_DISC_INDICATION); | |
2237 | break; | |
2238 | case RECV_DM_RSP: | |
2239 | /* IrLAP-1.1 p.82: in SCLOSE, S and I type RSP frames | |
2240 | * shall take us down into default NDM state, like DM_RSP | |
2241 | */ | |
2242 | case RECV_RR_RSP: | |
2243 | case RECV_RNR_RSP: | |
2244 | case RECV_REJ_RSP: | |
2245 | case RECV_SREJ_RSP: | |
2246 | case RECV_I_RSP: | |
2247 | /* Always switch state before calling upper layers */ | |
2248 | irlap_next_state(self, LAP_NDM); | |
2249 | ||
2250 | del_timer(&self->wd_timer); | |
2251 | irlap_apply_default_connection_parameters(self); | |
2252 | ||
2253 | irlap_disconnect_indication(self, LAP_DISC_INDICATION); | |
2254 | break; | |
2255 | case WD_TIMER_EXPIRED: | |
2256 | /* Always switch state before calling upper layers */ | |
2257 | irlap_next_state(self, LAP_NDM); | |
2258 | ||
2259 | irlap_apply_default_connection_parameters(self); | |
2260 | ||
2261 | irlap_disconnect_indication(self, LAP_DISC_INDICATION); | |
2262 | break; | |
2263 | default: | |
2264 | /* IrLAP-1.1 p.82: in SCLOSE, basically any received frame | |
2265 | * with pf=1 shall restart the wd-timer and resend the rd:rsp | |
2266 | */ | |
2267 | if (info != NULL && info->pf) { | |
2268 | del_timer(&self->wd_timer); | |
2269 | irlap_wait_min_turn_around(self, &self->qos_tx); | |
2270 | irlap_send_rd_frame(self); | |
2271 | irlap_start_wd_timer(self, self->wd_timeout); | |
2272 | break; /* stay in SCLOSE */ | |
2273 | } | |
2274 | ||
955a9d20 JP |
2275 | pr_debug("%s(), Unknown event %d, (%s)\n", __func__, |
2276 | event, irlap_event[event]); | |
1da177e4 | 2277 | |
1da177e4 LT |
2278 | break; |
2279 | } | |
2280 | ||
2281 | return -1; | |
2282 | } | |
2283 | ||
2284 | static int irlap_state_reset_check( struct irlap_cb *self, IRLAP_EVENT event, | |
2285 | struct sk_buff *skb, | |
2286 | struct irlap_info *info) | |
2287 | { | |
2288 | int ret = 0; | |
2289 | ||
955a9d20 | 2290 | pr_debug("%s(), event=%s\n", __func__, irlap_event[event]); |
1da177e4 LT |
2291 | |
2292 | IRDA_ASSERT(self != NULL, return -ENODEV;); | |
2293 | IRDA_ASSERT(self->magic == LAP_MAGIC, return -EBADR;); | |
2294 | ||
2295 | switch (event) { | |
2296 | case RESET_RESPONSE: | |
2297 | irlap_send_ua_response_frame(self, &self->qos_rx); | |
2298 | irlap_initiate_connection_state(self); | |
2299 | irlap_start_wd_timer(self, WD_TIMEOUT); | |
2300 | irlap_flush_all_queues(self); | |
2301 | ||
2302 | irlap_next_state(self, LAP_NRM_S); | |
2303 | break; | |
2304 | case DISCONNECT_REQUEST: | |
2305 | irlap_wait_min_turn_around(self, &self->qos_tx); | |
2306 | irlap_send_rd_frame(self); | |
2307 | irlap_start_wd_timer(self, WD_TIMEOUT); | |
2308 | irlap_next_state(self, LAP_SCLOSE); | |
2309 | break; | |
2310 | default: | |
955a9d20 JP |
2311 | pr_debug("%s(), Unknown event %d, (%s)\n", __func__, |
2312 | event, irlap_event[event]); | |
1da177e4 LT |
2313 | |
2314 | ret = -EINVAL; | |
2315 | break; | |
2316 | } | |
2317 | return ret; | |
2318 | } |