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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 | ||
a768851f | 81 | static const char *const irlap_event[] __maybe_unused = { |
1da177e4 LT |
82 | "DISCOVERY_REQUEST", |
83 | "CONNECT_REQUEST", | |
84 | "CONNECT_RESPONSE", | |
85 | "DISCONNECT_REQUEST", | |
86 | "DATA_REQUEST", | |
87 | "RESET_REQUEST", | |
88 | "RESET_RESPONSE", | |
89 | "SEND_I_CMD", | |
90 | "SEND_UI_FRAME", | |
91 | "RECV_DISCOVERY_XID_CMD", | |
92 | "RECV_DISCOVERY_XID_RSP", | |
93 | "RECV_SNRM_CMD", | |
94 | "RECV_TEST_CMD", | |
95 | "RECV_TEST_RSP", | |
96 | "RECV_UA_RSP", | |
97 | "RECV_DM_RSP", | |
98 | "RECV_RD_RSP", | |
99 | "RECV_I_CMD", | |
100 | "RECV_I_RSP", | |
101 | "RECV_UI_FRAME", | |
102 | "RECV_FRMR_RSP", | |
103 | "RECV_RR_CMD", | |
104 | "RECV_RR_RSP", | |
105 | "RECV_RNR_CMD", | |
106 | "RECV_RNR_RSP", | |
107 | "RECV_REJ_CMD", | |
108 | "RECV_REJ_RSP", | |
109 | "RECV_SREJ_CMD", | |
110 | "RECV_SREJ_RSP", | |
111 | "RECV_DISC_CMD", | |
112 | "SLOT_TIMER_EXPIRED", | |
113 | "QUERY_TIMER_EXPIRED", | |
114 | "FINAL_TIMER_EXPIRED", | |
115 | "POLL_TIMER_EXPIRED", | |
116 | "DISCOVERY_TIMER_EXPIRED", | |
117 | "WD_TIMER_EXPIRED", | |
118 | "BACKOFF_TIMER_EXPIRED", | |
119 | "MEDIA_BUSY_TIMER_EXPIRED", | |
120 | }; | |
1da177e4 | 121 | |
36cbd3dc | 122 | const char *const irlap_state[] = { |
1da177e4 LT |
123 | "LAP_NDM", |
124 | "LAP_QUERY", | |
125 | "LAP_REPLY", | |
126 | "LAP_CONN", | |
127 | "LAP_SETUP", | |
128 | "LAP_OFFLINE", | |
129 | "LAP_XMIT_P", | |
130 | "LAP_PCLOSE", | |
131 | "LAP_NRM_P", | |
132 | "LAP_RESET_WAIT", | |
133 | "LAP_RESET", | |
134 | "LAP_NRM_S", | |
135 | "LAP_XMIT_S", | |
136 | "LAP_SCLOSE", | |
137 | "LAP_RESET_CHECK", | |
138 | }; | |
139 | ||
140 | static int (*state[])(struct irlap_cb *self, IRLAP_EVENT event, | |
141 | struct sk_buff *skb, struct irlap_info *info) = | |
142 | { | |
143 | irlap_state_ndm, | |
144 | irlap_state_query, | |
145 | irlap_state_reply, | |
146 | irlap_state_conn, | |
147 | irlap_state_setup, | |
148 | irlap_state_offline, | |
149 | irlap_state_xmit_p, | |
150 | irlap_state_pclose, | |
151 | irlap_state_nrm_p, | |
152 | irlap_state_reset_wait, | |
153 | irlap_state_reset, | |
154 | irlap_state_nrm_s, | |
155 | irlap_state_xmit_s, | |
156 | irlap_state_sclose, | |
157 | irlap_state_reset_check, | |
158 | }; | |
159 | ||
160 | /* | |
161 | * Function irda_poll_timer_expired (data) | |
162 | * | |
163 | * Poll timer has expired. Normally we must now send a RR frame to the | |
164 | * remote device | |
165 | */ | |
166 | static void irlap_poll_timer_expired(void *data) | |
167 | { | |
168 | struct irlap_cb *self = (struct irlap_cb *) data; | |
169 | ||
170 | IRDA_ASSERT(self != NULL, return;); | |
171 | IRDA_ASSERT(self->magic == LAP_MAGIC, return;); | |
172 | ||
173 | irlap_do_event(self, POLL_TIMER_EXPIRED, NULL, NULL); | |
174 | } | |
175 | ||
176 | /* | |
177 | * Calculate and set time before we will have to send back the pf bit | |
178 | * to the peer. Use in primary. | |
179 | * Make sure that state is XMIT_P/XMIT_S when calling this function | |
180 | * (and that nobody messed up with the state). - Jean II | |
181 | */ | |
182 | static void irlap_start_poll_timer(struct irlap_cb *self, int timeout) | |
183 | { | |
184 | IRDA_ASSERT(self != NULL, return;); | |
185 | IRDA_ASSERT(self->magic == LAP_MAGIC, return;); | |
186 | ||
187 | #ifdef CONFIG_IRDA_FAST_RR | |
188 | /* | |
189 | * Send out the RR frames faster if our own transmit queue is empty, or | |
190 | * if the peer is busy. The effect is a much faster conversation | |
191 | */ | |
b03efcfb | 192 | if (skb_queue_empty(&self->txq) || self->remote_busy) { |
1da177e4 LT |
193 | if (self->fast_RR == TRUE) { |
194 | /* | |
195 | * Assert that the fast poll timer has not reached the | |
196 | * normal poll timer yet | |
197 | */ | |
198 | if (self->fast_RR_timeout < timeout) { | |
199 | /* | |
200 | * FIXME: this should be a more configurable | |
201 | * function | |
202 | */ | |
203 | self->fast_RR_timeout += | |
204 | (sysctl_fast_poll_increase * HZ/1000); | |
205 | ||
206 | /* Use this fast(er) timeout instead */ | |
207 | timeout = self->fast_RR_timeout; | |
208 | } | |
209 | } else { | |
210 | self->fast_RR = TRUE; | |
211 | ||
212 | /* Start with just 0 ms */ | |
213 | self->fast_RR_timeout = 0; | |
214 | timeout = 0; | |
215 | } | |
216 | } else | |
217 | self->fast_RR = FALSE; | |
218 | ||
955a9d20 | 219 | pr_debug("%s(), timeout=%d (%ld)\n", __func__, timeout, jiffies); |
1da177e4 LT |
220 | #endif /* CONFIG_IRDA_FAST_RR */ |
221 | ||
222 | if (timeout == 0) | |
223 | irlap_do_event(self, POLL_TIMER_EXPIRED, NULL, NULL); | |
224 | else | |
225 | irda_start_timer(&self->poll_timer, timeout, self, | |
226 | irlap_poll_timer_expired); | |
227 | } | |
228 | ||
229 | /* | |
230 | * Function irlap_do_event (event, skb, info) | |
231 | * | |
232 | * Rushes through the state machine without any delay. If state == XMIT | |
233 | * then send queued data frames. | |
234 | */ | |
235 | void irlap_do_event(struct irlap_cb *self, IRLAP_EVENT event, | |
236 | struct sk_buff *skb, struct irlap_info *info) | |
237 | { | |
238 | int ret; | |
239 | ||
240 | if (!self || self->magic != LAP_MAGIC) | |
241 | return; | |
242 | ||
955a9d20 JP |
243 | pr_debug("%s(), event = %s, state = %s\n", __func__, |
244 | irlap_event[event], irlap_state[self->state]); | |
1da177e4 LT |
245 | |
246 | ret = (*state[self->state])(self, event, skb, info); | |
247 | ||
248 | /* | |
249 | * Check if there are any pending events that needs to be executed | |
250 | */ | |
251 | switch (self->state) { | |
252 | case LAP_XMIT_P: /* FALLTHROUGH */ | |
253 | case LAP_XMIT_S: | |
254 | /* | |
255 | * We just received the pf bit and are at the beginning | |
256 | * of a new LAP transmit window. | |
257 | * Check if there are any queued data frames, and do not | |
258 | * try to disconnect link if we send any data frames, since | |
259 | * that will change the state away form XMIT | |
260 | */ | |
955a9d20 JP |
261 | pr_debug("%s() : queue len = %d\n", __func__, |
262 | skb_queue_len(&self->txq)); | |
1da177e4 | 263 | |
b03efcfb | 264 | if (!skb_queue_empty(&self->txq)) { |
1da177e4 LT |
265 | /* Prevent race conditions with irlap_data_request() */ |
266 | self->local_busy = TRUE; | |
267 | ||
268 | /* Theory of operation. | |
269 | * We send frames up to when we fill the window or | |
270 | * reach line capacity. Those frames will queue up | |
271 | * in the device queue, and the driver will slowly | |
272 | * send them. | |
273 | * After each frame that we send, we poll the higher | |
274 | * layer for more data. It's the right time to do | |
275 | * that because the link layer need to perform the mtt | |
276 | * and then send the first frame, so we can afford | |
277 | * to send a bit of time in kernel space. | |
278 | * The explicit flow indication allow to minimise | |
279 | * buffers (== lower latency), to avoid higher layer | |
280 | * polling via timers (== less context switches) and | |
281 | * to implement a crude scheduler - Jean II */ | |
282 | ||
283 | /* Try to send away all queued data frames */ | |
284 | while ((skb = skb_dequeue(&self->txq)) != NULL) { | |
285 | /* Send one frame */ | |
286 | ret = (*state[self->state])(self, SEND_I_CMD, | |
287 | skb, NULL); | |
288 | /* Drop reference count. | |
289 | * It will be increase as needed in | |
290 | * irlap_send_data_xxx() */ | |
291 | kfree_skb(skb); | |
292 | ||
293 | /* Poll the higher layers for one more frame */ | |
294 | irlmp_flow_indication(self->notify.instance, | |
295 | FLOW_START); | |
296 | ||
297 | if (ret == -EPROTO) | |
298 | break; /* Try again later! */ | |
299 | } | |
300 | /* Finished transmitting */ | |
301 | self->local_busy = FALSE; | |
302 | } else if (self->disconnect_pending) { | |
303 | self->disconnect_pending = FALSE; | |
304 | ||
305 | ret = (*state[self->state])(self, DISCONNECT_REQUEST, | |
306 | NULL, NULL); | |
307 | } | |
308 | break; | |
309 | /* case LAP_NDM: */ | |
310 | /* case LAP_CONN: */ | |
311 | /* case LAP_RESET_WAIT: */ | |
312 | /* case LAP_RESET_CHECK: */ | |
313 | default: | |
314 | break; | |
315 | } | |
316 | } | |
317 | ||
1da177e4 LT |
318 | /* |
319 | * Function irlap_state_ndm (event, skb, frame) | |
320 | * | |
321 | * NDM (Normal Disconnected Mode) state | |
322 | * | |
323 | */ | |
324 | static int irlap_state_ndm(struct irlap_cb *self, IRLAP_EVENT event, | |
325 | struct sk_buff *skb, struct irlap_info *info) | |
326 | { | |
327 | discovery_t *discovery_rsp; | |
328 | int ret = 0; | |
329 | ||
330 | IRDA_ASSERT(self != NULL, return -1;); | |
331 | IRDA_ASSERT(self->magic == LAP_MAGIC, return -1;); | |
332 | ||
333 | switch (event) { | |
334 | case CONNECT_REQUEST: | |
335 | IRDA_ASSERT(self->netdev != NULL, return -1;); | |
336 | ||
337 | if (self->media_busy) { | |
338 | /* Note : this will never happen, because we test | |
339 | * media busy in irlap_connect_request() and | |
340 | * postpone the event... - Jean II */ | |
955a9d20 JP |
341 | pr_debug("%s(), CONNECT_REQUEST: media busy!\n", |
342 | __func__); | |
1da177e4 LT |
343 | |
344 | /* Always switch state before calling upper layers */ | |
345 | irlap_next_state(self, LAP_NDM); | |
346 | ||
347 | irlap_disconnect_indication(self, LAP_MEDIA_BUSY); | |
348 | } else { | |
349 | irlap_send_snrm_frame(self, &self->qos_rx); | |
350 | ||
351 | /* Start Final-bit timer */ | |
352 | irlap_start_final_timer(self, self->final_timeout); | |
353 | ||
354 | self->retry_count = 0; | |
355 | irlap_next_state(self, LAP_SETUP); | |
356 | } | |
357 | break; | |
358 | case RECV_SNRM_CMD: | |
359 | /* Check if the frame contains and I field */ | |
360 | if (info) { | |
361 | self->daddr = info->daddr; | |
362 | self->caddr = info->caddr; | |
363 | ||
364 | irlap_next_state(self, LAP_CONN); | |
365 | ||
366 | irlap_connect_indication(self, skb); | |
367 | } else { | |
955a9d20 JP |
368 | pr_debug("%s(), SNRM frame does not contain an I field!\n", |
369 | __func__); | |
1da177e4 LT |
370 | } |
371 | break; | |
372 | case DISCOVERY_REQUEST: | |
373 | IRDA_ASSERT(info != NULL, return -1;); | |
374 | ||
375 | if (self->media_busy) { | |
955a9d20 JP |
376 | pr_debug("%s(), DISCOVERY_REQUEST: media busy!\n", |
377 | __func__); | |
1da177e4 LT |
378 | /* irlap->log.condition = MEDIA_BUSY; */ |
379 | ||
380 | /* This will make IrLMP try again */ | |
381 | irlap_discovery_confirm(self, NULL); | |
382 | /* Note : the discovery log is not cleaned up here, | |
383 | * it will be done in irlap_discovery_request() | |
384 | * Jean II */ | |
385 | return 0; | |
386 | } | |
387 | ||
388 | self->S = info->S; | |
389 | self->s = info->s; | |
390 | irlap_send_discovery_xid_frame(self, info->S, info->s, TRUE, | |
391 | info->discovery); | |
392 | self->frame_sent = FALSE; | |
393 | self->s++; | |
394 | ||
395 | irlap_start_slot_timer(self, self->slot_timeout); | |
396 | irlap_next_state(self, LAP_QUERY); | |
397 | break; | |
398 | case RECV_DISCOVERY_XID_CMD: | |
399 | IRDA_ASSERT(info != NULL, return -1;); | |
400 | ||
401 | /* Assert that this is not the final slot */ | |
402 | if (info->s <= info->S) { | |
403 | self->slot = irlap_generate_rand_time_slot(info->S, | |
404 | info->s); | |
405 | if (self->slot == info->s) { | |
406 | discovery_rsp = irlmp_get_discovery_response(); | |
407 | discovery_rsp->data.daddr = info->daddr; | |
408 | ||
409 | irlap_send_discovery_xid_frame(self, info->S, | |
410 | self->slot, | |
411 | FALSE, | |
412 | discovery_rsp); | |
413 | self->frame_sent = TRUE; | |
414 | } else | |
415 | self->frame_sent = FALSE; | |
416 | ||
417 | /* | |
418 | * Go to reply state until end of discovery to | |
419 | * inhibit our own transmissions. Set the timer | |
420 | * to not stay forever there... Jean II | |
421 | */ | |
422 | irlap_start_query_timer(self, info->S, info->s); | |
423 | irlap_next_state(self, LAP_REPLY); | |
424 | } else { | |
425 | /* This is the final slot. How is it possible ? | |
426 | * This would happen is both discoveries are just slightly | |
427 | * offset (if they are in sync, all packets are lost). | |
428 | * Most often, all the discovery requests will be received | |
429 | * in QUERY state (see my comment there), except for the | |
430 | * last frame that will come here. | |
431 | * The big trouble when it happen is that active discovery | |
432 | * doesn't happen, because nobody answer the discoveries | |
433 | * frame of the other guy, so the log shows up empty. | |
434 | * What should we do ? | |
435 | * Not much. It's too late to answer those discovery frames, | |
436 | * so we just pass the info to IrLMP who will put it in the | |
437 | * log (and post an event). | |
438 | * Another cause would be devices that do discovery much | |
439 | * slower than us, however the latest fixes should minimise | |
440 | * those cases... | |
441 | * Jean II | |
442 | */ | |
955a9d20 JP |
443 | pr_debug("%s(), Receiving final discovery request, missed the discovery slots :-(\n", |
444 | __func__); | |
1da177e4 LT |
445 | |
446 | /* Last discovery request -> in the log */ | |
447 | irlap_discovery_indication(self, info->discovery); | |
448 | } | |
449 | break; | |
450 | case MEDIA_BUSY_TIMER_EXPIRED: | |
451 | /* A bunch of events may be postponed because the media is | |
452 | * busy (usually immediately after we close a connection), | |
453 | * or while we are doing discovery (state query/reply). | |
454 | * In all those cases, the media busy flag will be cleared | |
455 | * when it's OK for us to process those postponed events. | |
456 | * This event is not mentioned in the state machines in the | |
457 | * IrLAP spec. It's because they didn't consider Ultra and | |
458 | * postponing connection request is optional. | |
459 | * Jean II */ | |
460 | #ifdef CONFIG_IRDA_ULTRA | |
461 | /* Send any pending Ultra frames if any */ | |
462 | if (!skb_queue_empty(&self->txq_ultra)) { | |
463 | /* We don't send the frame, just post an event. | |
464 | * Also, previously this code was in timer.c... | |
465 | * Jean II */ | |
466 | ret = (*state[self->state])(self, SEND_UI_FRAME, | |
467 | NULL, NULL); | |
468 | } | |
469 | #endif /* CONFIG_IRDA_ULTRA */ | |
470 | /* Check if we should try to connect. | |
471 | * This code was previously in irlap_do_event() */ | |
472 | if (self->connect_pending) { | |
473 | self->connect_pending = FALSE; | |
474 | ||
475 | /* This one *should* not pend in this state, except | |
476 | * if a socket try to connect and immediately | |
477 | * disconnect. - clear - Jean II */ | |
478 | if (self->disconnect_pending) | |
479 | irlap_disconnect_indication(self, LAP_DISC_INDICATION); | |
480 | else | |
481 | ret = (*state[self->state])(self, | |
482 | CONNECT_REQUEST, | |
483 | NULL, NULL); | |
484 | self->disconnect_pending = FALSE; | |
485 | } | |
486 | /* Note : one way to test if this code works well (including | |
487 | * media busy and small busy) is to create a user space | |
488 | * application generating an Ultra packet every 3.05 sec (or | |
489 | * 2.95 sec) and to see how it interact with discovery. | |
490 | * It's fairly easy to check that no packet is lost, that the | |
491 | * packets are postponed during discovery and that after | |
492 | * discovery indication you have a 100ms "gap". | |
493 | * As connection request and Ultra are now processed the same | |
494 | * way, this avoid the tedious job of trying IrLAP connection | |
495 | * in all those cases... | |
496 | * Jean II */ | |
497 | break; | |
498 | #ifdef CONFIG_IRDA_ULTRA | |
499 | case SEND_UI_FRAME: | |
500 | { | |
501 | int i; | |
502 | /* Only allowed to repeat an operation twice */ | |
503 | for (i=0; ((i<2) && (self->media_busy == FALSE)); i++) { | |
504 | skb = skb_dequeue(&self->txq_ultra); | |
505 | if (skb) | |
506 | irlap_send_ui_frame(self, skb, CBROADCAST, | |
507 | CMD_FRAME); | |
508 | else | |
509 | break; | |
510 | /* irlap_send_ui_frame() won't increase skb reference | |
511 | * count, so no dev_kfree_skb() - Jean II */ | |
512 | } | |
513 | if (i == 2) { | |
514 | /* Force us to listen 500 ms again */ | |
515 | irda_device_set_media_busy(self->netdev, TRUE); | |
516 | } | |
517 | break; | |
518 | } | |
519 | case RECV_UI_FRAME: | |
520 | /* Only accept broadcast frames in NDM mode */ | |
521 | if (info->caddr != CBROADCAST) { | |
955a9d20 JP |
522 | pr_debug("%s(), not a broadcast frame!\n", |
523 | __func__); | |
1da177e4 LT |
524 | } else |
525 | irlap_unitdata_indication(self, skb); | |
526 | break; | |
527 | #endif /* CONFIG_IRDA_ULTRA */ | |
528 | case RECV_TEST_CMD: | |
529 | /* Remove test frame header */ | |
530 | skb_pull(skb, sizeof(struct test_frame)); | |
531 | ||
532 | /* | |
533 | * Send response. This skb will not be sent out again, and | |
534 | * will only be used to send out the same info as the cmd | |
535 | */ | |
536 | irlap_send_test_frame(self, CBROADCAST, info->daddr, skb); | |
537 | break; | |
538 | case RECV_TEST_RSP: | |
955a9d20 | 539 | pr_debug("%s() not implemented!\n", __func__); |
1da177e4 LT |
540 | break; |
541 | default: | |
955a9d20 JP |
542 | pr_debug("%s(), Unknown event %s\n", __func__, |
543 | irlap_event[event]); | |
1da177e4 LT |
544 | |
545 | ret = -1; | |
546 | break; | |
547 | } | |
548 | return ret; | |
549 | } | |
550 | ||
551 | /* | |
552 | * Function irlap_state_query (event, skb, info) | |
553 | * | |
554 | * QUERY state | |
555 | * | |
556 | */ | |
557 | static int irlap_state_query(struct irlap_cb *self, IRLAP_EVENT event, | |
558 | struct sk_buff *skb, struct irlap_info *info) | |
559 | { | |
560 | int ret = 0; | |
561 | ||
562 | IRDA_ASSERT(self != NULL, return -1;); | |
563 | IRDA_ASSERT(self->magic == LAP_MAGIC, return -1;); | |
564 | ||
565 | switch (event) { | |
566 | case RECV_DISCOVERY_XID_RSP: | |
567 | IRDA_ASSERT(info != NULL, return -1;); | |
568 | IRDA_ASSERT(info->discovery != NULL, return -1;); | |
569 | ||
955a9d20 JP |
570 | pr_debug("%s(), daddr=%08x\n", __func__, |
571 | info->discovery->data.daddr); | |
1da177e4 LT |
572 | |
573 | if (!self->discovery_log) { | |
6c91023d JP |
574 | net_warn_ratelimited("%s: discovery log is gone! maybe the discovery timeout has been set too short?\n", |
575 | __func__); | |
1da177e4 LT |
576 | break; |
577 | } | |
578 | hashbin_insert(self->discovery_log, | |
579 | (irda_queue_t *) info->discovery, | |
580 | info->discovery->data.daddr, NULL); | |
581 | ||
582 | /* Keep state */ | |
583 | /* irlap_next_state(self, LAP_QUERY); */ | |
584 | ||
585 | break; | |
586 | case RECV_DISCOVERY_XID_CMD: | |
587 | /* Yes, it is possible to receive those frames in this mode. | |
588 | * Note that most often the last discovery request won't | |
589 | * occur here but in NDM state (see my comment there). | |
590 | * What should we do ? | |
591 | * Not much. We are currently performing our own discovery, | |
592 | * therefore we can't answer those frames. We don't want | |
593 | * to change state either. We just pass the info to | |
594 | * IrLMP who will put it in the log (and post an event). | |
595 | * Jean II | |
596 | */ | |
597 | ||
598 | IRDA_ASSERT(info != NULL, return -1;); | |
599 | ||
955a9d20 JP |
600 | pr_debug("%s(), Receiving discovery request (s = %d) while performing discovery :-(\n", |
601 | __func__, info->s); | |
1da177e4 LT |
602 | |
603 | /* Last discovery request ? */ | |
604 | if (info->s == 0xff) | |
605 | irlap_discovery_indication(self, info->discovery); | |
606 | break; | |
607 | case SLOT_TIMER_EXPIRED: | |
608 | /* | |
609 | * Wait a little longer if we detect an incoming frame. This | |
610 | * is not mentioned in the spec, but is a good thing to do, | |
611 | * since we want to work even with devices that violate the | |
612 | * timing requirements. | |
613 | */ | |
614 | if (irda_device_is_receiving(self->netdev) && !self->add_wait) { | |
955a9d20 JP |
615 | pr_debug("%s(), device is slow to answer, waiting some more!\n", |
616 | __func__); | |
1da177e4 LT |
617 | irlap_start_slot_timer(self, msecs_to_jiffies(10)); |
618 | self->add_wait = TRUE; | |
619 | return ret; | |
620 | } | |
621 | self->add_wait = FALSE; | |
622 | ||
623 | if (self->s < self->S) { | |
624 | irlap_send_discovery_xid_frame(self, self->S, | |
625 | self->s, TRUE, | |
626 | self->discovery_cmd); | |
627 | self->s++; | |
628 | irlap_start_slot_timer(self, self->slot_timeout); | |
629 | ||
630 | /* Keep state */ | |
631 | irlap_next_state(self, LAP_QUERY); | |
632 | } else { | |
633 | /* This is the final slot! */ | |
634 | irlap_send_discovery_xid_frame(self, self->S, 0xff, | |
635 | TRUE, | |
636 | self->discovery_cmd); | |
637 | ||
638 | /* Always switch state before calling upper layers */ | |
639 | irlap_next_state(self, LAP_NDM); | |
640 | ||
641 | /* | |
642 | * We are now finished with the discovery procedure, | |
643 | * so now we must return the results | |
644 | */ | |
645 | irlap_discovery_confirm(self, self->discovery_log); | |
646 | ||
647 | /* IrLMP should now have taken care of the log */ | |
648 | self->discovery_log = NULL; | |
649 | } | |
650 | break; | |
651 | default: | |
955a9d20 JP |
652 | pr_debug("%s(), Unknown event %s\n", __func__, |
653 | irlap_event[event]); | |
1da177e4 LT |
654 | |
655 | ret = -1; | |
656 | break; | |
657 | } | |
658 | return ret; | |
659 | } | |
660 | ||
661 | /* | |
662 | * Function irlap_state_reply (self, event, skb, info) | |
663 | * | |
664 | * REPLY, we have received a XID discovery frame from a device and we | |
665 | * are waiting for the right time slot to send a response XID frame | |
666 | * | |
667 | */ | |
668 | static int irlap_state_reply(struct irlap_cb *self, IRLAP_EVENT event, | |
669 | struct sk_buff *skb, struct irlap_info *info) | |
670 | { | |
671 | discovery_t *discovery_rsp; | |
672 | int ret=0; | |
673 | ||
1da177e4 LT |
674 | IRDA_ASSERT(self != NULL, return -1;); |
675 | IRDA_ASSERT(self->magic == LAP_MAGIC, return -1;); | |
676 | ||
677 | switch (event) { | |
678 | case QUERY_TIMER_EXPIRED: | |
955a9d20 JP |
679 | pr_debug("%s(), QUERY_TIMER_EXPIRED <%ld>\n", |
680 | __func__, jiffies); | |
1da177e4 LT |
681 | irlap_next_state(self, LAP_NDM); |
682 | break; | |
683 | case RECV_DISCOVERY_XID_CMD: | |
684 | IRDA_ASSERT(info != NULL, return -1;); | |
685 | /* Last frame? */ | |
686 | if (info->s == 0xff) { | |
687 | del_timer(&self->query_timer); | |
688 | ||
689 | /* info->log.condition = REMOTE; */ | |
690 | ||
691 | /* Always switch state before calling upper layers */ | |
692 | irlap_next_state(self, LAP_NDM); | |
693 | ||
694 | irlap_discovery_indication(self, info->discovery); | |
695 | } else { | |
696 | /* If it's our slot, send our reply */ | |
697 | if ((info->s >= self->slot) && (!self->frame_sent)) { | |
698 | discovery_rsp = irlmp_get_discovery_response(); | |
699 | discovery_rsp->data.daddr = info->daddr; | |
700 | ||
701 | irlap_send_discovery_xid_frame(self, info->S, | |
702 | self->slot, | |
703 | FALSE, | |
704 | discovery_rsp); | |
705 | ||
706 | self->frame_sent = TRUE; | |
707 | } | |
25985edc | 708 | /* Readjust our timer to accommodate devices |
1da177e4 LT |
709 | * doing faster or slower discovery than us... |
710 | * Jean II */ | |
711 | irlap_start_query_timer(self, info->S, info->s); | |
712 | ||
713 | /* Keep state */ | |
714 | //irlap_next_state(self, LAP_REPLY); | |
715 | } | |
716 | break; | |
717 | default: | |
955a9d20 JP |
718 | pr_debug("%s(), Unknown event %d, %s\n", __func__, |
719 | event, irlap_event[event]); | |
1da177e4 LT |
720 | |
721 | ret = -1; | |
722 | break; | |
723 | } | |
724 | return ret; | |
725 | } | |
726 | ||
727 | /* | |
728 | * Function irlap_state_conn (event, skb, info) | |
729 | * | |
730 | * CONN, we have received a SNRM command and is waiting for the upper | |
731 | * layer to accept or refuse connection | |
732 | * | |
733 | */ | |
734 | static int irlap_state_conn(struct irlap_cb *self, IRLAP_EVENT event, | |
735 | struct sk_buff *skb, struct irlap_info *info) | |
736 | { | |
737 | int ret = 0; | |
738 | ||
955a9d20 | 739 | pr_debug("%s(), event=%s\n", __func__, irlap_event[event]); |
1da177e4 LT |
740 | |
741 | IRDA_ASSERT(self != NULL, return -1;); | |
742 | IRDA_ASSERT(self->magic == LAP_MAGIC, return -1;); | |
743 | ||
744 | switch (event) { | |
745 | case CONNECT_RESPONSE: | |
746 | skb_pull(skb, sizeof(struct snrm_frame)); | |
747 | ||
748 | IRDA_ASSERT(self->netdev != NULL, return -1;); | |
749 | ||
750 | irlap_qos_negotiate(self, skb); | |
751 | ||
752 | irlap_initiate_connection_state(self); | |
753 | ||
754 | /* | |
755 | * Applying the parameters now will make sure we change speed | |
756 | * *after* we have sent the next frame | |
757 | */ | |
758 | irlap_apply_connection_parameters(self, FALSE); | |
759 | ||
760 | /* | |
761 | * Sending this frame will force a speed change after it has | |
762 | * been sent (i.e. the frame will be sent at 9600). | |
763 | */ | |
764 | irlap_send_ua_response_frame(self, &self->qos_rx); | |
765 | ||
766 | #if 0 | |
767 | /* | |
768 | * We are allowed to send two frames, but this may increase | |
769 | * the connect latency, so lets not do it for now. | |
770 | */ | |
771 | /* This is full of good intentions, but doesn't work in | |
772 | * practice. | |
773 | * After sending the first UA response, we switch the | |
774 | * dongle to the negotiated speed, which is usually | |
775 | * different than 9600 kb/s. | |
776 | * From there, there is two solutions : | |
777 | * 1) The other end has received the first UA response : | |
778 | * it will set up the connection, move to state LAP_NRM_P, | |
779 | * and will ignore and drop the second UA response. | |
780 | * Actually, it's even worse : the other side will almost | |
781 | * immediately send a RR that will likely collide with the | |
782 | * UA response (depending on negotiated turnaround). | |
783 | * 2) The other end has not received the first UA response, | |
784 | * will stay at 9600 and will never see the second UA response. | |
785 | * Jean II */ | |
786 | irlap_send_ua_response_frame(self, &self->qos_rx); | |
787 | #endif | |
788 | ||
789 | /* | |
790 | * The WD-timer could be set to the duration of the P-timer | |
791 | * for this case, but it is recommended to use twice the | |
792 | * value (note 3 IrLAP p. 60). | |
793 | */ | |
794 | irlap_start_wd_timer(self, self->wd_timeout); | |
795 | irlap_next_state(self, LAP_NRM_S); | |
796 | ||
797 | break; | |
798 | case RECV_DISCOVERY_XID_CMD: | |
955a9d20 JP |
799 | pr_debug("%s(), event RECV_DISCOVER_XID_CMD!\n", |
800 | __func__); | |
1da177e4 LT |
801 | irlap_next_state(self, LAP_NDM); |
802 | ||
803 | break; | |
804 | case DISCONNECT_REQUEST: | |
955a9d20 | 805 | pr_debug("%s(), Disconnect request!\n", __func__); |
1da177e4 LT |
806 | irlap_send_dm_frame(self); |
807 | irlap_next_state( self, LAP_NDM); | |
808 | irlap_disconnect_indication(self, LAP_DISC_INDICATION); | |
809 | break; | |
810 | default: | |
955a9d20 JP |
811 | pr_debug("%s(), Unknown event %d, %s\n", __func__, |
812 | event, irlap_event[event]); | |
1da177e4 LT |
813 | |
814 | ret = -1; | |
815 | break; | |
816 | } | |
817 | ||
818 | return ret; | |
819 | } | |
820 | ||
821 | /* | |
822 | * Function irlap_state_setup (event, skb, frame) | |
823 | * | |
824 | * SETUP state, The local layer has transmitted a SNRM command frame to | |
825 | * a remote peer layer and is awaiting a reply . | |
826 | * | |
827 | */ | |
828 | static int irlap_state_setup(struct irlap_cb *self, IRLAP_EVENT event, | |
829 | struct sk_buff *skb, struct irlap_info *info) | |
830 | { | |
831 | int ret = 0; | |
832 | ||
1da177e4 LT |
833 | IRDA_ASSERT(self != NULL, return -1;); |
834 | IRDA_ASSERT(self->magic == LAP_MAGIC, return -1;); | |
835 | ||
836 | switch (event) { | |
837 | case FINAL_TIMER_EXPIRED: | |
838 | if (self->retry_count < self->N3) { | |
839 | /* | |
840 | * Perform random backoff, Wait a random number of time units, minimum | |
841 | * duration half the time taken to transmitt a SNRM frame, maximum duration | |
842 | * 1.5 times the time taken to transmit a SNRM frame. So this time should | |
843 | * between 15 msecs and 45 msecs. | |
844 | */ | |
845 | irlap_start_backoff_timer(self, msecs_to_jiffies(20 + | |
6819bc2e | 846 | (jiffies % 30))); |
1da177e4 LT |
847 | } else { |
848 | /* Always switch state before calling upper layers */ | |
849 | irlap_next_state(self, LAP_NDM); | |
850 | ||
851 | irlap_disconnect_indication(self, LAP_FOUND_NONE); | |
852 | } | |
853 | break; | |
854 | case BACKOFF_TIMER_EXPIRED: | |
855 | irlap_send_snrm_frame(self, &self->qos_rx); | |
856 | irlap_start_final_timer(self, self->final_timeout); | |
857 | self->retry_count++; | |
858 | break; | |
859 | case RECV_SNRM_CMD: | |
955a9d20 | 860 | pr_debug("%s(), SNRM battle!\n", __func__); |
1da177e4 LT |
861 | |
862 | IRDA_ASSERT(skb != NULL, return 0;); | |
863 | IRDA_ASSERT(info != NULL, return 0;); | |
864 | ||
865 | /* | |
866 | * The device with the largest device address wins the battle | |
867 | * (both have sent a SNRM command!) | |
868 | */ | |
869 | if (info &&(info->daddr > self->saddr)) { | |
870 | del_timer(&self->final_timer); | |
871 | irlap_initiate_connection_state(self); | |
872 | ||
873 | IRDA_ASSERT(self->netdev != NULL, return -1;); | |
874 | ||
875 | skb_pull(skb, sizeof(struct snrm_frame)); | |
876 | ||
877 | irlap_qos_negotiate(self, skb); | |
878 | ||
879 | /* Send UA frame and then change link settings */ | |
880 | irlap_apply_connection_parameters(self, FALSE); | |
881 | irlap_send_ua_response_frame(self, &self->qos_rx); | |
882 | ||
883 | irlap_next_state(self, LAP_NRM_S); | |
884 | irlap_connect_confirm(self, skb); | |
885 | ||
886 | /* | |
887 | * The WD-timer could be set to the duration of the | |
888 | * P-timer for this case, but it is recommended | |
889 | * to use twice the value (note 3 IrLAP p. 60). | |
890 | */ | |
891 | irlap_start_wd_timer(self, self->wd_timeout); | |
892 | } else { | |
893 | /* We just ignore the other device! */ | |
894 | irlap_next_state(self, LAP_SETUP); | |
895 | } | |
896 | break; | |
897 | case RECV_UA_RSP: | |
898 | /* Stop F-timer */ | |
899 | del_timer(&self->final_timer); | |
900 | ||
901 | /* Initiate connection state */ | |
902 | irlap_initiate_connection_state(self); | |
903 | ||
904 | /* Negotiate connection parameters */ | |
905 | IRDA_ASSERT(skb->len > 10, return -1;); | |
906 | ||
907 | skb_pull(skb, sizeof(struct ua_frame)); | |
908 | ||
909 | IRDA_ASSERT(self->netdev != NULL, return -1;); | |
910 | ||
911 | irlap_qos_negotiate(self, skb); | |
912 | ||
913 | /* Set the new link setting *now* (before the rr frame) */ | |
914 | irlap_apply_connection_parameters(self, TRUE); | |
915 | self->retry_count = 0; | |
916 | ||
917 | /* Wait for turnaround time to give a chance to the other | |
918 | * device to be ready to receive us. | |
919 | * Note : the time to switch speed is typically larger | |
920 | * than the turnaround time, but as we don't have the other | |
921 | * side speed switch time, that's our best guess... | |
922 | * Jean II */ | |
923 | irlap_wait_min_turn_around(self, &self->qos_tx); | |
924 | ||
925 | /* This frame will actually be sent at the new speed */ | |
926 | irlap_send_rr_frame(self, CMD_FRAME); | |
927 | ||
928 | /* The timer is set to half the normal timer to quickly | |
25985edc | 929 | * detect a failure to negotiate the new connection |
1da177e4 LT |
930 | * parameters. IrLAP 6.11.3.2, note 3. |
931 | * Note that currently we don't process this failure | |
932 | * properly, as we should do a quick disconnect. | |
933 | * Jean II */ | |
934 | irlap_start_final_timer(self, self->final_timeout/2); | |
935 | irlap_next_state(self, LAP_NRM_P); | |
936 | ||
937 | irlap_connect_confirm(self, skb); | |
938 | break; | |
939 | case RECV_DM_RSP: /* FALLTHROUGH */ | |
940 | case RECV_DISC_CMD: | |
941 | del_timer(&self->final_timer); | |
942 | irlap_next_state(self, LAP_NDM); | |
943 | ||
944 | irlap_disconnect_indication(self, LAP_DISC_INDICATION); | |
945 | break; | |
946 | default: | |
955a9d20 JP |
947 | pr_debug("%s(), Unknown event %d, %s\n", __func__, |
948 | event, irlap_event[event]); | |
1da177e4 LT |
949 | |
950 | ret = -1; | |
951 | break; | |
952 | } | |
953 | return ret; | |
954 | } | |
955 | ||
956 | /* | |
957 | * Function irlap_state_offline (self, event, skb, info) | |
958 | * | |
959 | * OFFLINE state, not used for now! | |
960 | * | |
961 | */ | |
962 | static int irlap_state_offline(struct irlap_cb *self, IRLAP_EVENT event, | |
963 | struct sk_buff *skb, struct irlap_info *info) | |
964 | { | |
955a9d20 | 965 | pr_debug("%s(), Unknown event\n", __func__); |
1da177e4 LT |
966 | |
967 | return -1; | |
968 | } | |
969 | ||
970 | /* | |
971 | * Function irlap_state_xmit_p (self, event, skb, info) | |
972 | * | |
973 | * XMIT, Only the primary station has right to transmit, and we | |
974 | * therefore do not expect to receive any transmissions from other | |
975 | * stations. | |
976 | * | |
977 | */ | |
978 | static int irlap_state_xmit_p(struct irlap_cb *self, IRLAP_EVENT event, | |
979 | struct sk_buff *skb, struct irlap_info *info) | |
980 | { | |
981 | int ret = 0; | |
982 | ||
983 | switch (event) { | |
984 | case SEND_I_CMD: | |
985 | /* | |
986 | * Only send frame if send-window > 0. | |
987 | */ | |
988 | if ((self->window > 0) && (!self->remote_busy)) { | |
989 | int nextfit; | |
990 | #ifdef CONFIG_IRDA_DYNAMIC_WINDOW | |
991 | struct sk_buff *skb_next; | |
992 | ||
993 | /* With DYNAMIC_WINDOW, we keep the window size | |
994 | * maximum, and adapt on the packets we are sending. | |
995 | * At 115k, we can send only 2 packets of 2048 bytes | |
996 | * in a 500 ms turnaround. Without this option, we | |
997 | * would always limit the window to 2. With this | |
998 | * option, if we send smaller packets, we can send | |
999 | * up to 7 of them (always depending on QoS). | |
1000 | * Jean II */ | |
1001 | ||
1002 | /* Look at the next skb. This is safe, as we are | |
1003 | * the only consumer of the Tx queue (if we are not, | |
1004 | * we have other problems) - Jean II */ | |
1005 | skb_next = skb_peek(&self->txq); | |
1006 | ||
1007 | /* Check if a subsequent skb exist and would fit in | |
1008 | * the current window (with respect to turnaround | |
1009 | * time). | |
1010 | * This allow us to properly mark the current packet | |
1011 | * with the pf bit, to avoid falling back on the | |
1012 | * second test below, and avoid waiting the | |
1013 | * end of the window and sending a extra RR. | |
1014 | * Note : (skb_next != NULL) <=> (skb_queue_len() > 0) | |
1015 | * Jean II */ | |
1016 | nextfit = ((skb_next != NULL) && | |
1017 | ((skb_next->len + skb->len) <= | |
1018 | self->bytes_left)); | |
1019 | ||
1020 | /* | |
1021 | * The current packet may not fit ! Because of test | |
1022 | * above, this should not happen any more !!! | |
1023 | * Test if we have transmitted more bytes over the | |
1024 | * link than its possible to do with the current | |
1025 | * speed and turn-around-time. | |
1026 | */ | |
1027 | if((!nextfit) && (skb->len > self->bytes_left)) { | |
955a9d20 JP |
1028 | pr_debug("%s(), Not allowed to transmit more bytes!\n", |
1029 | __func__); | |
1da177e4 LT |
1030 | /* Requeue the skb */ |
1031 | skb_queue_head(&self->txq, skb_get(skb)); | |
1032 | /* | |
1033 | * We should switch state to LAP_NRM_P, but | |
1034 | * that is not possible since we must be sure | |
1035 | * that we poll the other side. Since we have | |
1036 | * used up our time, the poll timer should | |
1037 | * trigger anyway now, so we just wait for it | |
1038 | * DB | |
1039 | */ | |
1040 | /* | |
1041 | * Sorry, but that's not totally true. If | |
1042 | * we send 2000B packets, we may wait another | |
1043 | * 1000B until our turnaround expire. That's | |
1044 | * why we need to be proactive in avoiding | |
1045 | * coming here. - Jean II | |
1046 | */ | |
1047 | return -EPROTO; | |
1048 | } | |
1049 | ||
25985edc | 1050 | /* Subtract space used by this skb */ |
1da177e4 LT |
1051 | self->bytes_left -= skb->len; |
1052 | #else /* CONFIG_IRDA_DYNAMIC_WINDOW */ | |
1053 | /* Window has been adjusted for the max packet | |
1054 | * size, so much simpler... - Jean II */ | |
b03efcfb | 1055 | nextfit = !skb_queue_empty(&self->txq); |
1da177e4 LT |
1056 | #endif /* CONFIG_IRDA_DYNAMIC_WINDOW */ |
1057 | /* | |
1058 | * Send data with poll bit cleared only if window > 1 | |
1059 | * and there is more frames after this one to be sent | |
1060 | */ | |
1061 | if ((self->window > 1) && (nextfit)) { | |
1062 | /* More packet to send in current window */ | |
1063 | irlap_send_data_primary(self, skb); | |
1064 | irlap_next_state(self, LAP_XMIT_P); | |
1065 | } else { | |
1066 | /* Final packet of window */ | |
1067 | irlap_send_data_primary_poll(self, skb); | |
1da177e4 LT |
1068 | |
1069 | /* | |
1070 | * Make sure state machine does not try to send | |
1071 | * any more frames | |
1072 | */ | |
1073 | ret = -EPROTO; | |
1074 | } | |
1075 | #ifdef CONFIG_IRDA_FAST_RR | |
1076 | /* Peer may want to reply immediately */ | |
1077 | self->fast_RR = FALSE; | |
1078 | #endif /* CONFIG_IRDA_FAST_RR */ | |
1079 | } else { | |
955a9d20 JP |
1080 | pr_debug("%s(), Unable to send! remote busy?\n", |
1081 | __func__); | |
1da177e4 LT |
1082 | skb_queue_head(&self->txq, skb_get(skb)); |
1083 | ||
1084 | /* | |
1085 | * The next ret is important, because it tells | |
1086 | * irlap_next_state _not_ to deliver more frames | |
1087 | */ | |
1088 | ret = -EPROTO; | |
1089 | } | |
1090 | break; | |
1091 | case POLL_TIMER_EXPIRED: | |
955a9d20 JP |
1092 | pr_debug("%s(), POLL_TIMER_EXPIRED <%ld>\n", |
1093 | __func__, jiffies); | |
1da177e4 LT |
1094 | irlap_send_rr_frame(self, CMD_FRAME); |
1095 | /* Return to NRM properly - Jean II */ | |
1096 | self->window = self->window_size; | |
1097 | #ifdef CONFIG_IRDA_DYNAMIC_WINDOW | |
1098 | /* Allowed to transmit a maximum number of bytes again. */ | |
1099 | self->bytes_left = self->line_capacity; | |
1100 | #endif /* CONFIG_IRDA_DYNAMIC_WINDOW */ | |
1101 | irlap_start_final_timer(self, self->final_timeout); | |
1102 | irlap_next_state(self, LAP_NRM_P); | |
1103 | break; | |
1104 | case DISCONNECT_REQUEST: | |
1105 | del_timer(&self->poll_timer); | |
1106 | irlap_wait_min_turn_around(self, &self->qos_tx); | |
1107 | irlap_send_disc_frame(self); | |
1108 | irlap_flush_all_queues(self); | |
1109 | irlap_start_final_timer(self, self->final_timeout); | |
1110 | self->retry_count = 0; | |
1111 | irlap_next_state(self, LAP_PCLOSE); | |
1112 | break; | |
1113 | case DATA_REQUEST: | |
1114 | /* Nothing to do, irlap_do_event() will send the packet | |
1115 | * when we return... - Jean II */ | |
1116 | break; | |
1117 | default: | |
955a9d20 JP |
1118 | pr_debug("%s(), Unknown event %s\n", |
1119 | __func__, irlap_event[event]); | |
1da177e4 LT |
1120 | |
1121 | ret = -EINVAL; | |
1122 | break; | |
1123 | } | |
1124 | return ret; | |
1125 | } | |
1126 | ||
1127 | /* | |
1128 | * Function irlap_state_pclose (event, skb, info) | |
1129 | * | |
1130 | * PCLOSE state | |
1131 | */ | |
1132 | static int irlap_state_pclose(struct irlap_cb *self, IRLAP_EVENT event, | |
1133 | struct sk_buff *skb, struct irlap_info *info) | |
1134 | { | |
1135 | int ret = 0; | |
1136 | ||
1da177e4 LT |
1137 | IRDA_ASSERT(self != NULL, return -1;); |
1138 | IRDA_ASSERT(self->magic == LAP_MAGIC, return -1;); | |
1139 | ||
1140 | switch (event) { | |
1141 | case RECV_UA_RSP: /* FALLTHROUGH */ | |
1142 | case RECV_DM_RSP: | |
1143 | del_timer(&self->final_timer); | |
1144 | ||
1145 | /* Set new link parameters */ | |
1146 | irlap_apply_default_connection_parameters(self); | |
1147 | ||
1148 | /* Always switch state before calling upper layers */ | |
1149 | irlap_next_state(self, LAP_NDM); | |
1150 | ||
1151 | irlap_disconnect_indication(self, LAP_DISC_INDICATION); | |
1152 | break; | |
1153 | case FINAL_TIMER_EXPIRED: | |
1154 | if (self->retry_count < self->N3) { | |
1155 | irlap_wait_min_turn_around(self, &self->qos_tx); | |
1156 | irlap_send_disc_frame(self); | |
1157 | irlap_start_final_timer(self, self->final_timeout); | |
1158 | self->retry_count++; | |
1159 | /* Keep state */ | |
1160 | } else { | |
1161 | irlap_apply_default_connection_parameters(self); | |
1162 | ||
1163 | /* Always switch state before calling upper layers */ | |
1164 | irlap_next_state(self, LAP_NDM); | |
1165 | ||
1166 | irlap_disconnect_indication(self, LAP_NO_RESPONSE); | |
1167 | } | |
1168 | break; | |
1169 | default: | |
955a9d20 | 1170 | pr_debug("%s(), Unknown event %d\n", __func__, event); |
1da177e4 LT |
1171 | |
1172 | ret = -1; | |
1173 | break; | |
1174 | } | |
1175 | return ret; | |
1176 | } | |
1177 | ||
1178 | /* | |
1179 | * Function irlap_state_nrm_p (self, event, skb, info) | |
1180 | * | |
1181 | * NRM_P (Normal Response Mode as Primary), The primary station has given | |
1182 | * permissions to a secondary station to transmit IrLAP resonse frames | |
1183 | * (by sending a frame with the P bit set). The primary station will not | |
1184 | * transmit any frames and is expecting to receive frames only from the | |
1185 | * secondary to which transmission permissions has been given. | |
1186 | */ | |
1187 | static int irlap_state_nrm_p(struct irlap_cb *self, IRLAP_EVENT event, | |
1188 | struct sk_buff *skb, struct irlap_info *info) | |
1189 | { | |
1190 | int ret = 0; | |
1191 | int ns_status; | |
1192 | int nr_status; | |
1193 | ||
1194 | switch (event) { | |
1195 | case RECV_I_RSP: /* Optimize for the common case */ | |
5d780cd6 RB |
1196 | if (unlikely(skb->len <= LAP_ADDR_HEADER + LAP_CTRL_HEADER)) { |
1197 | /* | |
1198 | * Input validation check: a stir4200/mcp2150 | |
1199 | * combination sometimes results in an empty i:rsp. | |
1200 | * This makes no sense; we can just ignore the frame | |
1201 | * and send an rr:cmd immediately. This happens before | |
1202 | * changing nr or ns so triggers a retransmit | |
1203 | */ | |
1204 | irlap_wait_min_turn_around(self, &self->qos_tx); | |
1205 | irlap_send_rr_frame(self, CMD_FRAME); | |
1206 | /* Keep state */ | |
1207 | break; | |
1208 | } | |
1da177e4 LT |
1209 | /* FIXME: must check for remote_busy below */ |
1210 | #ifdef CONFIG_IRDA_FAST_RR | |
1211 | /* | |
1212 | * Reset the fast_RR so we can use the fast RR code with | |
1213 | * full speed the next time since peer may have more frames | |
1214 | * to transmitt | |
1215 | */ | |
1216 | self->fast_RR = FALSE; | |
1217 | #endif /* CONFIG_IRDA_FAST_RR */ | |
1218 | IRDA_ASSERT( info != NULL, return -1;); | |
1219 | ||
1220 | ns_status = irlap_validate_ns_received(self, info->ns); | |
1221 | nr_status = irlap_validate_nr_received(self, info->nr); | |
1222 | ||
1223 | /* | |
1224 | * Check for expected I(nformation) frame | |
1225 | */ | |
1226 | if ((ns_status == NS_EXPECTED) && (nr_status == NR_EXPECTED)) { | |
1227 | ||
1228 | /* Update Vr (next frame for us to receive) */ | |
1229 | self->vr = (self->vr + 1) % 8; | |
1230 | ||
1231 | /* Update Nr received, cleanup our retry queue */ | |
1232 | irlap_update_nr_received(self, info->nr); | |
1233 | ||
1234 | /* | |
1235 | * Got expected NR, so reset the | |
1236 | * retry_count. This is not done by IrLAP spec, | |
1237 | * which is strange! | |
1238 | */ | |
1239 | self->retry_count = 0; | |
1240 | self->ack_required = TRUE; | |
1241 | ||
1242 | /* poll bit cleared? */ | |
1243 | if (!info->pf) { | |
1244 | /* Keep state, do not move this line */ | |
1245 | irlap_next_state(self, LAP_NRM_P); | |
1246 | ||
1247 | irlap_data_indication(self, skb, FALSE); | |
1248 | } else { | |
1249 | /* No longer waiting for pf */ | |
1250 | del_timer(&self->final_timer); | |
1251 | ||
1252 | irlap_wait_min_turn_around(self, &self->qos_tx); | |
1253 | ||
1254 | /* Call higher layer *before* changing state | |
1255 | * to give them a chance to send data in the | |
1256 | * next LAP frame. | |
1257 | * Jean II */ | |
1258 | irlap_data_indication(self, skb, FALSE); | |
1259 | ||
1260 | /* XMIT states are the most dangerous state | |
1261 | * to be in, because user requests are | |
1262 | * processed directly and may change state. | |
1263 | * On the other hand, in NDM_P, those | |
1264 | * requests are queued and we will process | |
1265 | * them when we return to irlap_do_event(). | |
1266 | * Jean II | |
1267 | */ | |
1268 | irlap_next_state(self, LAP_XMIT_P); | |
1269 | ||
1270 | /* This is the last frame. | |
1271 | * Make sure it's always called in XMIT state. | |
1272 | * - Jean II */ | |
1273 | irlap_start_poll_timer(self, self->poll_timeout); | |
1274 | } | |
1275 | break; | |
1276 | ||
1277 | } | |
1278 | /* Unexpected next to send (Ns) */ | |
1279 | if ((ns_status == NS_UNEXPECTED) && (nr_status == NR_EXPECTED)) | |
1280 | { | |
1281 | if (!info->pf) { | |
1282 | irlap_update_nr_received(self, info->nr); | |
1283 | ||
1284 | /* | |
1285 | * Wait until the last frame before doing | |
1286 | * anything | |
1287 | */ | |
1288 | ||
1289 | /* Keep state */ | |
1290 | irlap_next_state(self, LAP_NRM_P); | |
1291 | } else { | |
955a9d20 JP |
1292 | pr_debug("%s(), missing or duplicate frame!\n", |
1293 | __func__); | |
1da177e4 LT |
1294 | |
1295 | /* Update Nr received */ | |
1296 | irlap_update_nr_received(self, info->nr); | |
1297 | ||
1298 | irlap_wait_min_turn_around(self, &self->qos_tx); | |
1299 | irlap_send_rr_frame(self, CMD_FRAME); | |
1300 | ||
1301 | self->ack_required = FALSE; | |
1302 | ||
1303 | irlap_start_final_timer(self, self->final_timeout); | |
1304 | irlap_next_state(self, LAP_NRM_P); | |
1305 | } | |
1306 | break; | |
1307 | } | |
1308 | /* | |
1309 | * Unexpected next to receive (Nr) | |
1310 | */ | |
1311 | if ((ns_status == NS_EXPECTED) && (nr_status == NR_UNEXPECTED)) | |
1312 | { | |
1313 | if (info->pf) { | |
1314 | self->vr = (self->vr + 1) % 8; | |
1315 | ||
1316 | /* Update Nr received */ | |
1317 | irlap_update_nr_received(self, info->nr); | |
1318 | ||
1319 | /* Resend rejected frames */ | |
1320 | irlap_resend_rejected_frames(self, CMD_FRAME); | |
1321 | ||
1322 | self->ack_required = FALSE; | |
1323 | ||
1324 | /* Make sure we account for the time | |
1325 | * to transmit our frames. See comemnts | |
1326 | * in irlap_send_data_primary_poll(). | |
1327 | * Jean II */ | |
1328 | irlap_start_final_timer(self, 2 * self->final_timeout); | |
1329 | ||
1330 | /* Keep state, do not move this line */ | |
1331 | irlap_next_state(self, LAP_NRM_P); | |
1332 | ||
1333 | irlap_data_indication(self, skb, FALSE); | |
1334 | } else { | |
1335 | /* | |
1336 | * Do not resend frames until the last | |
1337 | * frame has arrived from the other | |
1338 | * device. This is not documented in | |
1339 | * IrLAP!! | |
1340 | */ | |
1341 | self->vr = (self->vr + 1) % 8; | |
1342 | ||
1343 | /* Update Nr received */ | |
1344 | irlap_update_nr_received(self, info->nr); | |
1345 | ||
1346 | self->ack_required = FALSE; | |
1347 | ||
1348 | /* Keep state, do not move this line!*/ | |
1349 | irlap_next_state(self, LAP_NRM_P); | |
1350 | ||
1351 | irlap_data_indication(self, skb, FALSE); | |
1352 | } | |
1353 | break; | |
1354 | } | |
1355 | /* | |
1356 | * Unexpected next to send (Ns) and next to receive (Nr) | |
1357 | * Not documented by IrLAP! | |
1358 | */ | |
1359 | if ((ns_status == NS_UNEXPECTED) && | |
1360 | (nr_status == NR_UNEXPECTED)) | |
1361 | { | |
955a9d20 JP |
1362 | pr_debug("%s(), unexpected nr and ns!\n", |
1363 | __func__); | |
1da177e4 LT |
1364 | if (info->pf) { |
1365 | /* Resend rejected frames */ | |
1366 | irlap_resend_rejected_frames(self, CMD_FRAME); | |
1367 | ||
6819bc2e | 1368 | /* Give peer some time to retransmit! |
1da177e4 LT |
1369 | * But account for our own Tx. */ |
1370 | irlap_start_final_timer(self, 2 * self->final_timeout); | |
1371 | ||
1372 | /* Keep state, do not move this line */ | |
1373 | irlap_next_state(self, LAP_NRM_P); | |
1374 | } else { | |
1375 | /* Update Nr received */ | |
1376 | /* irlap_update_nr_received( info->nr); */ | |
1377 | ||
1378 | self->ack_required = FALSE; | |
1379 | } | |
1380 | break; | |
1381 | } | |
1382 | ||
1383 | /* | |
1384 | * Invalid NR or NS | |
1385 | */ | |
1386 | if ((nr_status == NR_INVALID) || (ns_status == NS_INVALID)) { | |
1387 | if (info->pf) { | |
1388 | del_timer(&self->final_timer); | |
1389 | ||
1390 | irlap_next_state(self, LAP_RESET_WAIT); | |
1391 | ||
1392 | irlap_disconnect_indication(self, LAP_RESET_INDICATION); | |
1393 | self->xmitflag = TRUE; | |
1394 | } else { | |
1395 | del_timer(&self->final_timer); | |
1396 | ||
1397 | irlap_disconnect_indication(self, LAP_RESET_INDICATION); | |
1398 | ||
1399 | self->xmitflag = FALSE; | |
1400 | } | |
1401 | break; | |
1402 | } | |
955a9d20 JP |
1403 | pr_debug("%s(), Not implemented!\n", __func__); |
1404 | pr_debug("%s(), event=%s, ns_status=%d, nr_status=%d\n", | |
1405 | __func__, irlap_event[event], ns_status, nr_status); | |
1da177e4 LT |
1406 | break; |
1407 | case RECV_UI_FRAME: | |
1408 | /* Poll bit cleared? */ | |
1409 | if (!info->pf) { | |
1410 | irlap_data_indication(self, skb, TRUE); | |
1411 | irlap_next_state(self, LAP_NRM_P); | |
1412 | } else { | |
1413 | del_timer(&self->final_timer); | |
1414 | irlap_data_indication(self, skb, TRUE); | |
1415 | irlap_next_state(self, LAP_XMIT_P); | |
955a9d20 JP |
1416 | pr_debug("%s: RECV_UI_FRAME: next state %s\n", |
1417 | __func__, irlap_state[self->state]); | |
1da177e4 LT |
1418 | irlap_start_poll_timer(self, self->poll_timeout); |
1419 | } | |
1420 | break; | |
1421 | case RECV_RR_RSP: | |
1422 | /* | |
1423 | * If you get a RR, the remote isn't busy anymore, | |
1424 | * no matter what the NR | |
1425 | */ | |
1426 | self->remote_busy = FALSE; | |
1427 | ||
b7e773b8 L |
1428 | /* Stop final timer */ |
1429 | del_timer(&self->final_timer); | |
1430 | ||
1da177e4 LT |
1431 | /* |
1432 | * Nr as expected? | |
1433 | */ | |
1434 | ret = irlap_validate_nr_received(self, info->nr); | |
1435 | if (ret == NR_EXPECTED) { | |
1da177e4 LT |
1436 | /* Update Nr received */ |
1437 | irlap_update_nr_received(self, info->nr); | |
1438 | ||
1439 | /* | |
1440 | * Got expected NR, so reset the retry_count. This | |
1441 | * is not done by the IrLAP standard , which is | |
1442 | * strange! DB. | |
1443 | */ | |
1444 | self->retry_count = 0; | |
1445 | irlap_wait_min_turn_around(self, &self->qos_tx); | |
1446 | ||
1447 | irlap_next_state(self, LAP_XMIT_P); | |
1448 | ||
1449 | /* Start poll timer */ | |
1450 | irlap_start_poll_timer(self, self->poll_timeout); | |
1451 | } else if (ret == NR_UNEXPECTED) { | |
1452 | IRDA_ASSERT(info != NULL, return -1;); | |
1453 | /* | |
1454 | * Unexpected nr! | |
1455 | */ | |
1456 | ||
1457 | /* Update Nr received */ | |
1458 | irlap_update_nr_received(self, info->nr); | |
1459 | ||
955a9d20 JP |
1460 | pr_debug("RECV_RR_FRAME: Retrans:%d, nr=%d, va=%d, vs=%d, vr=%d\n", |
1461 | self->retry_count, info->nr, self->va, | |
1462 | self->vs, self->vr); | |
1da177e4 LT |
1463 | |
1464 | /* Resend rejected frames */ | |
1465 | irlap_resend_rejected_frames(self, CMD_FRAME); | |
b7e773b8 | 1466 | irlap_start_final_timer(self, self->final_timeout * 2); |
1da177e4 LT |
1467 | |
1468 | irlap_next_state(self, LAP_NRM_P); | |
1469 | } else if (ret == NR_INVALID) { | |
955a9d20 JP |
1470 | pr_debug("%s(), Received RR with invalid nr !\n", |
1471 | __func__); | |
1da177e4 LT |
1472 | |
1473 | irlap_next_state(self, LAP_RESET_WAIT); | |
1474 | ||
1475 | irlap_disconnect_indication(self, LAP_RESET_INDICATION); | |
1476 | self->xmitflag = TRUE; | |
1477 | } | |
1478 | break; | |
1479 | case RECV_RNR_RSP: | |
1480 | IRDA_ASSERT(info != NULL, return -1;); | |
1481 | ||
1482 | /* Stop final timer */ | |
1483 | del_timer(&self->final_timer); | |
1484 | self->remote_busy = TRUE; | |
1485 | ||
1486 | /* Update Nr received */ | |
1487 | irlap_update_nr_received(self, info->nr); | |
1488 | irlap_next_state(self, LAP_XMIT_P); | |
1489 | ||
1490 | /* Start poll timer */ | |
1491 | irlap_start_poll_timer(self, self->poll_timeout); | |
1492 | break; | |
1493 | case RECV_FRMR_RSP: | |
1494 | del_timer(&self->final_timer); | |
1495 | self->xmitflag = TRUE; | |
1496 | irlap_next_state(self, LAP_RESET_WAIT); | |
1497 | irlap_reset_indication(self); | |
1498 | break; | |
1499 | case FINAL_TIMER_EXPIRED: | |
1500 | /* | |
1501 | * We are allowed to wait for additional 300 ms if | |
1502 | * final timer expires when we are in the middle | |
1503 | * of receiving a frame (page 45, IrLAP). Check that | |
1504 | * we only do this once for each frame. | |
1505 | */ | |
1506 | if (irda_device_is_receiving(self->netdev) && !self->add_wait) { | |
955a9d20 | 1507 | pr_debug("FINAL_TIMER_EXPIRED when receiving a frame! Waiting a little bit more!\n"); |
1da177e4 LT |
1508 | irlap_start_final_timer(self, msecs_to_jiffies(300)); |
1509 | ||
1510 | /* | |
1511 | * Don't allow this to happen one more time in a row, | |
1512 | * or else we can get a pretty tight loop here if | |
1513 | * if we only receive half a frame. DB. | |
1514 | */ | |
1515 | self->add_wait = TRUE; | |
1516 | break; | |
1517 | } | |
1518 | self->add_wait = FALSE; | |
1519 | ||
1520 | /* N2 is the disconnect timer. Until we reach it, we retry */ | |
1521 | if (self->retry_count < self->N2) { | |
6d97b53e RB |
1522 | if (skb_peek(&self->wx_list) == NULL) { |
1523 | /* Retry sending the pf bit to the secondary */ | |
955a9d20 | 1524 | pr_debug("nrm_p: resending rr"); |
6d97b53e RB |
1525 | irlap_wait_min_turn_around(self, &self->qos_tx); |
1526 | irlap_send_rr_frame(self, CMD_FRAME); | |
1527 | } else { | |
955a9d20 | 1528 | pr_debug("nrm_p: resend frames"); |
6d97b53e RB |
1529 | irlap_resend_rejected_frames(self, CMD_FRAME); |
1530 | } | |
1da177e4 LT |
1531 | |
1532 | irlap_start_final_timer(self, self->final_timeout); | |
1533 | self->retry_count++; | |
955a9d20 JP |
1534 | pr_debug("irlap_state_nrm_p: FINAL_TIMER_EXPIRED: retry_count=%d\n", |
1535 | self->retry_count); | |
1da177e4 LT |
1536 | |
1537 | /* Early warning event. I'm using a pretty liberal | |
1538 | * interpretation of the spec and generate an event | |
1539 | * every time the timer is multiple of N1 (and not | |
1540 | * only the first time). This allow application | |
1541 | * to know precisely if connectivity restart... | |
1542 | * Jean II */ | |
1543 | if((self->retry_count % self->N1) == 0) | |
1544 | irlap_status_indication(self, | |
1545 | STATUS_NO_ACTIVITY); | |
1546 | ||
1547 | /* Keep state */ | |
1548 | } else { | |
1549 | irlap_apply_default_connection_parameters(self); | |
1550 | ||
1551 | /* Always switch state before calling upper layers */ | |
1552 | irlap_next_state(self, LAP_NDM); | |
1553 | irlap_disconnect_indication(self, LAP_NO_RESPONSE); | |
1554 | } | |
1555 | break; | |
1556 | case RECV_REJ_RSP: | |
1557 | irlap_update_nr_received(self, info->nr); | |
1558 | if (self->remote_busy) { | |
1559 | irlap_wait_min_turn_around(self, &self->qos_tx); | |
1560 | irlap_send_rr_frame(self, CMD_FRAME); | |
1561 | } else | |
1562 | irlap_resend_rejected_frames(self, CMD_FRAME); | |
1563 | irlap_start_final_timer(self, 2 * self->final_timeout); | |
1564 | break; | |
1565 | case RECV_SREJ_RSP: | |
1566 | irlap_update_nr_received(self, info->nr); | |
1567 | if (self->remote_busy) { | |
1568 | irlap_wait_min_turn_around(self, &self->qos_tx); | |
1569 | irlap_send_rr_frame(self, CMD_FRAME); | |
1570 | } else | |
1571 | irlap_resend_rejected_frame(self, CMD_FRAME); | |
1572 | irlap_start_final_timer(self, 2 * self->final_timeout); | |
1573 | break; | |
1574 | case RECV_RD_RSP: | |
955a9d20 | 1575 | pr_debug("%s(), RECV_RD_RSP\n", __func__); |
1da177e4 LT |
1576 | |
1577 | irlap_flush_all_queues(self); | |
1578 | irlap_next_state(self, LAP_XMIT_P); | |
1579 | /* Call back the LAP state machine to do a proper disconnect */ | |
1580 | irlap_disconnect_request(self); | |
1581 | break; | |
1582 | default: | |
955a9d20 JP |
1583 | pr_debug("%s(), Unknown event %s\n", |
1584 | __func__, irlap_event[event]); | |
1da177e4 LT |
1585 | |
1586 | ret = -1; | |
1587 | break; | |
1588 | } | |
1589 | return ret; | |
1590 | } | |
1591 | ||
1592 | /* | |
1593 | * Function irlap_state_reset_wait (event, skb, info) | |
1594 | * | |
1595 | * We have informed the service user of a reset condition, and is | |
1596 | * awaiting reset of disconnect request. | |
1597 | * | |
1598 | */ | |
1599 | static int irlap_state_reset_wait(struct irlap_cb *self, IRLAP_EVENT event, | |
1600 | struct sk_buff *skb, struct irlap_info *info) | |
1601 | { | |
1602 | int ret = 0; | |
1603 | ||
955a9d20 | 1604 | pr_debug("%s(), event = %s\n", __func__, irlap_event[event]); |
1da177e4 LT |
1605 | |
1606 | IRDA_ASSERT(self != NULL, return -1;); | |
1607 | IRDA_ASSERT(self->magic == LAP_MAGIC, return -1;); | |
1608 | ||
1609 | switch (event) { | |
1610 | case RESET_REQUEST: | |
1611 | if (self->xmitflag) { | |
1612 | irlap_wait_min_turn_around(self, &self->qos_tx); | |
1613 | irlap_send_snrm_frame(self, NULL); | |
1614 | irlap_start_final_timer(self, self->final_timeout); | |
1615 | irlap_next_state(self, LAP_RESET); | |
1616 | } else { | |
1617 | irlap_start_final_timer(self, self->final_timeout); | |
1618 | irlap_next_state(self, LAP_RESET); | |
1619 | } | |
1620 | break; | |
1621 | case DISCONNECT_REQUEST: | |
1622 | irlap_wait_min_turn_around( self, &self->qos_tx); | |
1623 | irlap_send_disc_frame( self); | |
1624 | irlap_flush_all_queues( self); | |
1625 | irlap_start_final_timer( self, self->final_timeout); | |
1626 | self->retry_count = 0; | |
1627 | irlap_next_state( self, LAP_PCLOSE); | |
1628 | break; | |
1629 | default: | |
955a9d20 JP |
1630 | pr_debug("%s(), Unknown event %s\n", __func__, |
1631 | irlap_event[event]); | |
1da177e4 LT |
1632 | |
1633 | ret = -1; | |
1634 | break; | |
1635 | } | |
1636 | return ret; | |
1637 | } | |
1638 | ||
1639 | /* | |
1640 | * Function irlap_state_reset (self, event, skb, info) | |
1641 | * | |
1642 | * We have sent a SNRM reset command to the peer layer, and is awaiting | |
1643 | * reply. | |
1644 | * | |
1645 | */ | |
1646 | static int irlap_state_reset(struct irlap_cb *self, IRLAP_EVENT event, | |
1647 | struct sk_buff *skb, struct irlap_info *info) | |
1648 | { | |
1649 | int ret = 0; | |
1650 | ||
955a9d20 | 1651 | pr_debug("%s(), event = %s\n", __func__, irlap_event[event]); |
1da177e4 LT |
1652 | |
1653 | IRDA_ASSERT(self != NULL, return -1;); | |
1654 | IRDA_ASSERT(self->magic == LAP_MAGIC, return -1;); | |
1655 | ||
1656 | switch (event) { | |
1657 | case RECV_DISC_CMD: | |
1658 | del_timer(&self->final_timer); | |
1659 | ||
1660 | irlap_apply_default_connection_parameters(self); | |
1661 | ||
1662 | /* Always switch state before calling upper layers */ | |
1663 | irlap_next_state(self, LAP_NDM); | |
1664 | ||
1665 | irlap_disconnect_indication(self, LAP_NO_RESPONSE); | |
1666 | ||
1667 | break; | |
1668 | case RECV_UA_RSP: | |
1669 | del_timer(&self->final_timer); | |
1670 | ||
1671 | /* Initiate connection state */ | |
1672 | irlap_initiate_connection_state(self); | |
1673 | ||
1674 | irlap_reset_confirm(); | |
1675 | ||
1676 | self->remote_busy = FALSE; | |
1677 | ||
1678 | irlap_next_state(self, LAP_XMIT_P); | |
1679 | ||
1680 | irlap_start_poll_timer(self, self->poll_timeout); | |
1681 | ||
1682 | break; | |
1683 | case FINAL_TIMER_EXPIRED: | |
1684 | if (self->retry_count < 3) { | |
1685 | irlap_wait_min_turn_around(self, &self->qos_tx); | |
1686 | ||
1687 | IRDA_ASSERT(self->netdev != NULL, return -1;); | |
1688 | irlap_send_snrm_frame(self, self->qos_dev); | |
1689 | ||
1690 | self->retry_count++; /* Experimental!! */ | |
1691 | ||
1692 | irlap_start_final_timer(self, self->final_timeout); | |
1693 | irlap_next_state(self, LAP_RESET); | |
1694 | } else if (self->retry_count >= self->N3) { | |
1695 | irlap_apply_default_connection_parameters(self); | |
1696 | ||
1697 | /* Always switch state before calling upper layers */ | |
1698 | irlap_next_state(self, LAP_NDM); | |
1699 | ||
1700 | irlap_disconnect_indication(self, LAP_NO_RESPONSE); | |
1701 | } | |
1702 | break; | |
1703 | case RECV_SNRM_CMD: | |
1704 | /* | |
1705 | * SNRM frame is not allowed to contain an I-field in this | |
1706 | * state | |
1707 | */ | |
1708 | if (!info) { | |
955a9d20 | 1709 | pr_debug("%s(), RECV_SNRM_CMD\n", __func__); |
1da177e4 LT |
1710 | irlap_initiate_connection_state(self); |
1711 | irlap_wait_min_turn_around(self, &self->qos_tx); | |
1712 | irlap_send_ua_response_frame(self, &self->qos_rx); | |
1713 | irlap_reset_confirm(); | |
1714 | irlap_start_wd_timer(self, self->wd_timeout); | |
1715 | irlap_next_state(self, LAP_NDM); | |
1716 | } else { | |
955a9d20 JP |
1717 | pr_debug("%s(), SNRM frame contained an I field!\n", |
1718 | __func__); | |
1da177e4 LT |
1719 | } |
1720 | break; | |
1721 | default: | |
955a9d20 JP |
1722 | pr_debug("%s(), Unknown event %s\n", |
1723 | __func__, irlap_event[event]); | |
1da177e4 LT |
1724 | |
1725 | ret = -1; | |
1726 | break; | |
1727 | } | |
1728 | return ret; | |
1729 | } | |
1730 | ||
1731 | /* | |
1732 | * Function irlap_state_xmit_s (event, skb, info) | |
1733 | * | |
1734 | * XMIT_S, The secondary station has been given the right to transmit, | |
af901ca1 | 1735 | * and we therefore do not expect to receive any transmissions from other |
1da177e4 LT |
1736 | * stations. |
1737 | */ | |
1738 | static int irlap_state_xmit_s(struct irlap_cb *self, IRLAP_EVENT event, | |
1739 | struct sk_buff *skb, struct irlap_info *info) | |
1740 | { | |
1741 | int ret = 0; | |
1742 | ||
955a9d20 | 1743 | pr_debug("%s(), event=%s\n", __func__, irlap_event[event]); |
1da177e4 LT |
1744 | |
1745 | IRDA_ASSERT(self != NULL, return -ENODEV;); | |
1746 | IRDA_ASSERT(self->magic == LAP_MAGIC, return -EBADR;); | |
1747 | ||
1748 | switch (event) { | |
1749 | case SEND_I_CMD: | |
1750 | /* | |
1751 | * Send frame only if send window > 0 | |
1752 | */ | |
1753 | if ((self->window > 0) && (!self->remote_busy)) { | |
1754 | int nextfit; | |
1755 | #ifdef CONFIG_IRDA_DYNAMIC_WINDOW | |
1756 | struct sk_buff *skb_next; | |
1757 | ||
1758 | /* | |
1759 | * Same deal as in irlap_state_xmit_p(), so see | |
1760 | * the comments at that point. | |
1761 | * We are the secondary, so there are only subtle | |
1762 | * differences. - Jean II | |
1763 | */ | |
1764 | ||
1765 | /* Check if a subsequent skb exist and would fit in | |
1766 | * the current window (with respect to turnaround | |
1767 | * time). - Jean II */ | |
1768 | skb_next = skb_peek(&self->txq); | |
1769 | nextfit = ((skb_next != NULL) && | |
1770 | ((skb_next->len + skb->len) <= | |
1771 | self->bytes_left)); | |
1772 | ||
1773 | /* | |
1774 | * Test if we have transmitted more bytes over the | |
1775 | * link than its possible to do with the current | |
1776 | * speed and turn-around-time. | |
1777 | */ | |
1778 | if((!nextfit) && (skb->len > self->bytes_left)) { | |
955a9d20 JP |
1779 | pr_debug("%s(), Not allowed to transmit more bytes!\n", |
1780 | __func__); | |
1da177e4 LT |
1781 | /* Requeue the skb */ |
1782 | skb_queue_head(&self->txq, skb_get(skb)); | |
1783 | ||
1784 | /* | |
1785 | * Switch to NRM_S, this is only possible | |
1786 | * when we are in secondary mode, since we | |
1787 | * must be sure that we don't miss any RR | |
1788 | * frames | |
1789 | */ | |
1790 | self->window = self->window_size; | |
1791 | self->bytes_left = self->line_capacity; | |
1792 | irlap_start_wd_timer(self, self->wd_timeout); | |
1793 | ||
1794 | irlap_next_state(self, LAP_NRM_S); | |
1795 | /* Slight difference with primary : | |
1796 | * here we would wait for the other side to | |
1797 | * expire the turnaround. - Jean II */ | |
1798 | ||
1799 | return -EPROTO; /* Try again later */ | |
1800 | } | |
25985edc | 1801 | /* Subtract space used by this skb */ |
1da177e4 LT |
1802 | self->bytes_left -= skb->len; |
1803 | #else /* CONFIG_IRDA_DYNAMIC_WINDOW */ | |
1804 | /* Window has been adjusted for the max packet | |
1805 | * size, so much simpler... - Jean II */ | |
b03efcfb | 1806 | nextfit = !skb_queue_empty(&self->txq); |
1da177e4 LT |
1807 | #endif /* CONFIG_IRDA_DYNAMIC_WINDOW */ |
1808 | /* | |
1809 | * Send data with final bit cleared only if window > 1 | |
1810 | * and there is more frames to be sent | |
1811 | */ | |
1812 | if ((self->window > 1) && (nextfit)) { | |
1813 | irlap_send_data_secondary(self, skb); | |
1814 | irlap_next_state(self, LAP_XMIT_S); | |
1815 | } else { | |
1816 | irlap_send_data_secondary_final(self, skb); | |
1817 | irlap_next_state(self, LAP_NRM_S); | |
1818 | ||
1819 | /* | |
1820 | * Make sure state machine does not try to send | |
1821 | * any more frames | |
1822 | */ | |
1823 | ret = -EPROTO; | |
1824 | } | |
1825 | } else { | |
955a9d20 | 1826 | pr_debug("%s(), Unable to send!\n", __func__); |
1da177e4 LT |
1827 | skb_queue_head(&self->txq, skb_get(skb)); |
1828 | ret = -EPROTO; | |
1829 | } | |
1830 | break; | |
1831 | case DISCONNECT_REQUEST: | |
1832 | irlap_send_rd_frame(self); | |
1833 | irlap_flush_all_queues(self); | |
1834 | irlap_start_wd_timer(self, self->wd_timeout); | |
1835 | irlap_next_state(self, LAP_SCLOSE); | |
1836 | break; | |
1837 | case DATA_REQUEST: | |
1838 | /* Nothing to do, irlap_do_event() will send the packet | |
1839 | * when we return... - Jean II */ | |
1840 | break; | |
1841 | default: | |
955a9d20 JP |
1842 | pr_debug("%s(), Unknown event %s\n", __func__, |
1843 | irlap_event[event]); | |
1da177e4 LT |
1844 | |
1845 | ret = -EINVAL; | |
1846 | break; | |
1847 | } | |
1848 | return ret; | |
1849 | } | |
1850 | ||
1851 | /* | |
1852 | * Function irlap_state_nrm_s (event, skb, info) | |
1853 | * | |
1854 | * NRM_S (Normal Response Mode as Secondary) state, in this state we are | |
1855 | * expecting to receive frames from the primary station | |
1856 | * | |
1857 | */ | |
1858 | static int irlap_state_nrm_s(struct irlap_cb *self, IRLAP_EVENT event, | |
1859 | struct sk_buff *skb, struct irlap_info *info) | |
1860 | { | |
1861 | int ns_status; | |
1862 | int nr_status; | |
1863 | int ret = 0; | |
1864 | ||
955a9d20 | 1865 | pr_debug("%s(), event=%s\n", __func__, irlap_event[event]); |
1da177e4 LT |
1866 | |
1867 | IRDA_ASSERT(self != NULL, return -1;); | |
1868 | IRDA_ASSERT(self->magic == LAP_MAGIC, return -1;); | |
1869 | ||
1870 | switch (event) { | |
1871 | case RECV_I_CMD: /* Optimize for the common case */ | |
1872 | /* FIXME: must check for remote_busy below */ | |
955a9d20 JP |
1873 | pr_debug("%s(), event=%s nr=%d, vs=%d, ns=%d, vr=%d, pf=%d\n", |
1874 | __func__, irlap_event[event], info->nr, | |
1875 | self->vs, info->ns, self->vr, info->pf); | |
1da177e4 LT |
1876 | |
1877 | self->retry_count = 0; | |
1878 | ||
1879 | ns_status = irlap_validate_ns_received(self, info->ns); | |
1880 | nr_status = irlap_validate_nr_received(self, info->nr); | |
1881 | /* | |
1882 | * Check for expected I(nformation) frame | |
1883 | */ | |
1884 | if ((ns_status == NS_EXPECTED) && (nr_status == NR_EXPECTED)) { | |
1885 | ||
1886 | /* Update Vr (next frame for us to receive) */ | |
1887 | self->vr = (self->vr + 1) % 8; | |
1888 | ||
1889 | /* Update Nr received */ | |
1890 | irlap_update_nr_received(self, info->nr); | |
1891 | ||
1892 | /* | |
1893 | * poll bit cleared? | |
1894 | */ | |
1895 | if (!info->pf) { | |
1896 | ||
1897 | self->ack_required = TRUE; | |
1898 | ||
1899 | /* | |
1900 | * Starting WD-timer here is optional, but | |
1901 | * not recommended. Note 6 IrLAP p. 83 | |
1902 | */ | |
1903 | #if 0 | |
1904 | irda_start_timer(WD_TIMER, self->wd_timeout); | |
1905 | #endif | |
1906 | /* Keep state, do not move this line */ | |
1907 | irlap_next_state(self, LAP_NRM_S); | |
1908 | ||
1909 | irlap_data_indication(self, skb, FALSE); | |
1910 | break; | |
1911 | } else { | |
1912 | /* | |
1913 | * We should wait before sending RR, and | |
1914 | * also before changing to XMIT_S | |
1915 | * state. (note 1, IrLAP p. 82) | |
1916 | */ | |
1917 | irlap_wait_min_turn_around(self, &self->qos_tx); | |
1918 | ||
1919 | /* | |
1920 | * Give higher layers a chance to | |
1921 | * immediately reply with some data before | |
1922 | * we decide if we should send a RR frame | |
1923 | * or not | |
1924 | */ | |
1925 | irlap_data_indication(self, skb, FALSE); | |
1926 | ||
1927 | /* Any pending data requests? */ | |
b03efcfb | 1928 | if (!skb_queue_empty(&self->txq) && |
1da177e4 LT |
1929 | (self->window > 0)) |
1930 | { | |
1931 | self->ack_required = TRUE; | |
1932 | ||
1933 | del_timer(&self->wd_timer); | |
1934 | ||
1935 | irlap_next_state(self, LAP_XMIT_S); | |
1936 | } else { | |
1937 | irlap_send_rr_frame(self, RSP_FRAME); | |
1938 | irlap_start_wd_timer(self, | |
1939 | self->wd_timeout); | |
1940 | ||
1941 | /* Keep the state */ | |
1942 | irlap_next_state(self, LAP_NRM_S); | |
1943 | } | |
1944 | break; | |
1945 | } | |
1946 | } | |
1947 | /* | |
1948 | * Check for Unexpected next to send (Ns) | |
1949 | */ | |
1950 | if ((ns_status == NS_UNEXPECTED) && (nr_status == NR_EXPECTED)) | |
1951 | { | |
1952 | /* Unexpected next to send, with final bit cleared */ | |
1953 | if (!info->pf) { | |
1954 | irlap_update_nr_received(self, info->nr); | |
1955 | ||
1956 | irlap_start_wd_timer(self, self->wd_timeout); | |
1957 | } else { | |
1958 | /* Update Nr received */ | |
1959 | irlap_update_nr_received(self, info->nr); | |
1960 | ||
1961 | irlap_wait_min_turn_around(self, &self->qos_tx); | |
1962 | irlap_send_rr_frame(self, RSP_FRAME); | |
1963 | ||
1964 | irlap_start_wd_timer(self, self->wd_timeout); | |
1965 | } | |
1966 | break; | |
1967 | } | |
1968 | ||
1969 | /* | |
1970 | * Unexpected Next to Receive(NR) ? | |
1971 | */ | |
1972 | if ((ns_status == NS_EXPECTED) && (nr_status == NR_UNEXPECTED)) | |
1973 | { | |
1974 | if (info->pf) { | |
955a9d20 | 1975 | pr_debug("RECV_I_RSP: frame(s) lost\n"); |
1da177e4 LT |
1976 | |
1977 | self->vr = (self->vr + 1) % 8; | |
1978 | ||
1979 | /* Update Nr received */ | |
1980 | irlap_update_nr_received(self, info->nr); | |
1981 | ||
1982 | /* Resend rejected frames */ | |
1983 | irlap_resend_rejected_frames(self, RSP_FRAME); | |
1984 | ||
1985 | /* Keep state, do not move this line */ | |
1986 | irlap_next_state(self, LAP_NRM_S); | |
1987 | ||
1988 | irlap_data_indication(self, skb, FALSE); | |
1989 | irlap_start_wd_timer(self, self->wd_timeout); | |
1990 | break; | |
1991 | } | |
1992 | /* | |
1993 | * This is not documented in IrLAP!! Unexpected NR | |
1994 | * with poll bit cleared | |
1995 | */ | |
1996 | if (!info->pf) { | |
1997 | self->vr = (self->vr + 1) % 8; | |
1998 | ||
1999 | /* Update Nr received */ | |
2000 | irlap_update_nr_received(self, info->nr); | |
2001 | ||
2002 | /* Keep state, do not move this line */ | |
2003 | irlap_next_state(self, LAP_NRM_S); | |
2004 | ||
2005 | irlap_data_indication(self, skb, FALSE); | |
2006 | irlap_start_wd_timer(self, self->wd_timeout); | |
2007 | } | |
2008 | break; | |
2009 | } | |
2010 | ||
2011 | if (ret == NR_INVALID) { | |
955a9d20 | 2012 | pr_debug("NRM_S, NR_INVALID not implemented!\n"); |
1da177e4 LT |
2013 | } |
2014 | if (ret == NS_INVALID) { | |
955a9d20 | 2015 | pr_debug("NRM_S, NS_INVALID not implemented!\n"); |
1da177e4 LT |
2016 | } |
2017 | break; | |
2018 | case RECV_UI_FRAME: | |
2019 | /* | |
2020 | * poll bit cleared? | |
2021 | */ | |
2022 | if (!info->pf) { | |
2023 | irlap_data_indication(self, skb, TRUE); | |
2024 | irlap_next_state(self, LAP_NRM_S); /* Keep state */ | |
2025 | } else { | |
2026 | /* | |
2027 | * Any pending data requests? | |
2028 | */ | |
b03efcfb | 2029 | if (!skb_queue_empty(&self->txq) && |
1da177e4 LT |
2030 | (self->window > 0) && !self->remote_busy) |
2031 | { | |
2032 | irlap_data_indication(self, skb, TRUE); | |
2033 | ||
2034 | del_timer(&self->wd_timer); | |
2035 | ||
2036 | irlap_next_state(self, LAP_XMIT_S); | |
2037 | } else { | |
2038 | irlap_data_indication(self, skb, TRUE); | |
2039 | ||
2040 | irlap_wait_min_turn_around(self, &self->qos_tx); | |
2041 | ||
2042 | irlap_send_rr_frame(self, RSP_FRAME); | |
2043 | self->ack_required = FALSE; | |
2044 | ||
2045 | irlap_start_wd_timer(self, self->wd_timeout); | |
2046 | ||
2047 | /* Keep the state */ | |
2048 | irlap_next_state(self, LAP_NRM_S); | |
2049 | } | |
2050 | } | |
2051 | break; | |
2052 | case RECV_RR_CMD: | |
2053 | self->retry_count = 0; | |
2054 | ||
2055 | /* | |
2056 | * Nr as expected? | |
2057 | */ | |
2058 | nr_status = irlap_validate_nr_received(self, info->nr); | |
2059 | if (nr_status == NR_EXPECTED) { | |
b03efcfb | 2060 | if (!skb_queue_empty(&self->txq) && |
1da177e4 LT |
2061 | (self->window > 0)) { |
2062 | self->remote_busy = FALSE; | |
2063 | ||
2064 | /* Update Nr received */ | |
2065 | irlap_update_nr_received(self, info->nr); | |
2066 | del_timer(&self->wd_timer); | |
2067 | ||
2068 | irlap_wait_min_turn_around(self, &self->qos_tx); | |
2069 | irlap_next_state(self, LAP_XMIT_S); | |
2070 | } else { | |
2071 | self->remote_busy = FALSE; | |
2072 | /* Update Nr received */ | |
2073 | irlap_update_nr_received(self, info->nr); | |
2074 | irlap_wait_min_turn_around(self, &self->qos_tx); | |
2075 | irlap_start_wd_timer(self, self->wd_timeout); | |
2076 | ||
2077 | /* Note : if the link is idle (this case), | |
2078 | * we never go in XMIT_S, so we never get a | |
2079 | * chance to process any DISCONNECT_REQUEST. | |
2080 | * Do it now ! - Jean II */ | |
2081 | if (self->disconnect_pending) { | |
2082 | /* Disconnect */ | |
2083 | irlap_send_rd_frame(self); | |
2084 | irlap_flush_all_queues(self); | |
2085 | ||
2086 | irlap_next_state(self, LAP_SCLOSE); | |
2087 | } else { | |
2088 | /* Just send back pf bit */ | |
2089 | irlap_send_rr_frame(self, RSP_FRAME); | |
2090 | ||
2091 | irlap_next_state(self, LAP_NRM_S); | |
2092 | } | |
2093 | } | |
2094 | } else if (nr_status == NR_UNEXPECTED) { | |
2095 | self->remote_busy = FALSE; | |
2096 | irlap_update_nr_received(self, info->nr); | |
2097 | irlap_resend_rejected_frames(self, RSP_FRAME); | |
2098 | ||
2099 | irlap_start_wd_timer(self, self->wd_timeout); | |
2100 | ||
2101 | /* Keep state */ | |
2102 | irlap_next_state(self, LAP_NRM_S); | |
2103 | } else { | |
955a9d20 JP |
2104 | pr_debug("%s(), invalid nr not implemented!\n", |
2105 | __func__); | |
1da177e4 LT |
2106 | } |
2107 | break; | |
2108 | case RECV_SNRM_CMD: | |
2109 | /* SNRM frame is not allowed to contain an I-field */ | |
2110 | if (!info) { | |
2111 | del_timer(&self->wd_timer); | |
955a9d20 | 2112 | pr_debug("%s(), received SNRM cmd\n", __func__); |
1da177e4 LT |
2113 | irlap_next_state(self, LAP_RESET_CHECK); |
2114 | ||
2115 | irlap_reset_indication(self); | |
2116 | } else { | |
955a9d20 JP |
2117 | pr_debug("%s(), SNRM frame contained an I-field!\n", |
2118 | __func__); | |
1da177e4 LT |
2119 | |
2120 | } | |
2121 | break; | |
2122 | case RECV_REJ_CMD: | |
2123 | irlap_update_nr_received(self, info->nr); | |
2124 | if (self->remote_busy) { | |
2125 | irlap_wait_min_turn_around(self, &self->qos_tx); | |
2126 | irlap_send_rr_frame(self, RSP_FRAME); | |
2127 | } else | |
2128 | irlap_resend_rejected_frames(self, RSP_FRAME); | |
2129 | irlap_start_wd_timer(self, self->wd_timeout); | |
2130 | break; | |
2131 | case RECV_SREJ_CMD: | |
2132 | irlap_update_nr_received(self, info->nr); | |
2133 | if (self->remote_busy) { | |
2134 | irlap_wait_min_turn_around(self, &self->qos_tx); | |
2135 | irlap_send_rr_frame(self, RSP_FRAME); | |
2136 | } else | |
2137 | irlap_resend_rejected_frame(self, RSP_FRAME); | |
2138 | irlap_start_wd_timer(self, self->wd_timeout); | |
2139 | break; | |
2140 | case WD_TIMER_EXPIRED: | |
2141 | /* | |
2142 | * Wait until retry_count * n matches negotiated threshold/ | |
2143 | * disconnect time (note 2 in IrLAP p. 82) | |
2144 | * | |
2145 | * Similar to irlap_state_nrm_p() -> FINAL_TIMER_EXPIRED | |
2146 | * Note : self->wd_timeout = (self->final_timeout * 2), | |
2147 | * which explain why we use (self->N2 / 2) here !!! | |
2148 | * Jean II | |
2149 | */ | |
955a9d20 JP |
2150 | pr_debug("%s(), retry_count = %d\n", __func__, |
2151 | self->retry_count); | |
1da177e4 LT |
2152 | |
2153 | if (self->retry_count < (self->N2 / 2)) { | |
2154 | /* No retry, just wait for primary */ | |
2155 | irlap_start_wd_timer(self, self->wd_timeout); | |
2156 | self->retry_count++; | |
2157 | ||
2158 | if((self->retry_count % (self->N1 / 2)) == 0) | |
2159 | irlap_status_indication(self, | |
2160 | STATUS_NO_ACTIVITY); | |
2161 | } else { | |
2162 | irlap_apply_default_connection_parameters(self); | |
2163 | ||
2164 | /* Always switch state before calling upper layers */ | |
2165 | irlap_next_state(self, LAP_NDM); | |
2166 | irlap_disconnect_indication(self, LAP_NO_RESPONSE); | |
2167 | } | |
2168 | break; | |
2169 | case RECV_DISC_CMD: | |
2170 | /* Always switch state before calling upper layers */ | |
2171 | irlap_next_state(self, LAP_NDM); | |
2172 | ||
2173 | /* Send disconnect response */ | |
2174 | irlap_wait_min_turn_around(self, &self->qos_tx); | |
2175 | irlap_send_ua_response_frame(self, NULL); | |
2176 | ||
2177 | del_timer(&self->wd_timer); | |
2178 | irlap_flush_all_queues(self); | |
2179 | /* Set default link parameters */ | |
2180 | irlap_apply_default_connection_parameters(self); | |
2181 | ||
2182 | irlap_disconnect_indication(self, LAP_DISC_INDICATION); | |
2183 | break; | |
2184 | case RECV_DISCOVERY_XID_CMD: | |
2185 | irlap_wait_min_turn_around(self, &self->qos_tx); | |
2186 | irlap_send_rr_frame(self, RSP_FRAME); | |
2187 | self->ack_required = TRUE; | |
2188 | irlap_start_wd_timer(self, self->wd_timeout); | |
2189 | irlap_next_state(self, LAP_NRM_S); | |
2190 | ||
2191 | break; | |
2192 | case RECV_TEST_CMD: | |
2193 | /* Remove test frame header (only LAP header in NRM) */ | |
2194 | skb_pull(skb, LAP_ADDR_HEADER + LAP_CTRL_HEADER); | |
2195 | ||
2196 | irlap_wait_min_turn_around(self, &self->qos_tx); | |
2197 | irlap_start_wd_timer(self, self->wd_timeout); | |
2198 | ||
2199 | /* Send response (info will be copied) */ | |
2200 | irlap_send_test_frame(self, self->caddr, info->daddr, skb); | |
2201 | break; | |
2202 | default: | |
955a9d20 JP |
2203 | pr_debug("%s(), Unknown event %d, (%s)\n", __func__, |
2204 | event, irlap_event[event]); | |
1da177e4 LT |
2205 | |
2206 | ret = -EINVAL; | |
2207 | break; | |
2208 | } | |
2209 | return ret; | |
2210 | } | |
2211 | ||
2212 | /* | |
2213 | * Function irlap_state_sclose (self, event, skb, info) | |
2214 | */ | |
2215 | static int irlap_state_sclose(struct irlap_cb *self, IRLAP_EVENT event, | |
2216 | struct sk_buff *skb, struct irlap_info *info) | |
2217 | { | |
1da177e4 LT |
2218 | IRDA_ASSERT(self != NULL, return -ENODEV;); |
2219 | IRDA_ASSERT(self->magic == LAP_MAGIC, return -EBADR;); | |
2220 | ||
2221 | switch (event) { | |
2222 | case RECV_DISC_CMD: | |
2223 | /* Always switch state before calling upper layers */ | |
2224 | irlap_next_state(self, LAP_NDM); | |
2225 | ||
2226 | /* Send disconnect response */ | |
2227 | irlap_wait_min_turn_around(self, &self->qos_tx); | |
2228 | irlap_send_ua_response_frame(self, NULL); | |
2229 | ||
2230 | del_timer(&self->wd_timer); | |
2231 | /* Set default link parameters */ | |
2232 | irlap_apply_default_connection_parameters(self); | |
2233 | ||
2234 | irlap_disconnect_indication(self, LAP_DISC_INDICATION); | |
2235 | break; | |
2236 | case RECV_DM_RSP: | |
2237 | /* IrLAP-1.1 p.82: in SCLOSE, S and I type RSP frames | |
2238 | * shall take us down into default NDM state, like DM_RSP | |
2239 | */ | |
2240 | case RECV_RR_RSP: | |
2241 | case RECV_RNR_RSP: | |
2242 | case RECV_REJ_RSP: | |
2243 | case RECV_SREJ_RSP: | |
2244 | case RECV_I_RSP: | |
2245 | /* Always switch state before calling upper layers */ | |
2246 | irlap_next_state(self, LAP_NDM); | |
2247 | ||
2248 | del_timer(&self->wd_timer); | |
2249 | irlap_apply_default_connection_parameters(self); | |
2250 | ||
2251 | irlap_disconnect_indication(self, LAP_DISC_INDICATION); | |
2252 | break; | |
2253 | case WD_TIMER_EXPIRED: | |
2254 | /* Always switch state before calling upper layers */ | |
2255 | irlap_next_state(self, LAP_NDM); | |
2256 | ||
2257 | irlap_apply_default_connection_parameters(self); | |
2258 | ||
2259 | irlap_disconnect_indication(self, LAP_DISC_INDICATION); | |
2260 | break; | |
2261 | default: | |
2262 | /* IrLAP-1.1 p.82: in SCLOSE, basically any received frame | |
2263 | * with pf=1 shall restart the wd-timer and resend the rd:rsp | |
2264 | */ | |
2265 | if (info != NULL && info->pf) { | |
2266 | del_timer(&self->wd_timer); | |
2267 | irlap_wait_min_turn_around(self, &self->qos_tx); | |
2268 | irlap_send_rd_frame(self); | |
2269 | irlap_start_wd_timer(self, self->wd_timeout); | |
2270 | break; /* stay in SCLOSE */ | |
2271 | } | |
2272 | ||
955a9d20 JP |
2273 | pr_debug("%s(), Unknown event %d, (%s)\n", __func__, |
2274 | event, irlap_event[event]); | |
1da177e4 | 2275 | |
1da177e4 LT |
2276 | break; |
2277 | } | |
2278 | ||
2279 | return -1; | |
2280 | } | |
2281 | ||
2282 | static int irlap_state_reset_check( struct irlap_cb *self, IRLAP_EVENT event, | |
2283 | struct sk_buff *skb, | |
2284 | struct irlap_info *info) | |
2285 | { | |
2286 | int ret = 0; | |
2287 | ||
955a9d20 | 2288 | pr_debug("%s(), event=%s\n", __func__, irlap_event[event]); |
1da177e4 LT |
2289 | |
2290 | IRDA_ASSERT(self != NULL, return -ENODEV;); | |
2291 | IRDA_ASSERT(self->magic == LAP_MAGIC, return -EBADR;); | |
2292 | ||
2293 | switch (event) { | |
2294 | case RESET_RESPONSE: | |
2295 | irlap_send_ua_response_frame(self, &self->qos_rx); | |
2296 | irlap_initiate_connection_state(self); | |
2297 | irlap_start_wd_timer(self, WD_TIMEOUT); | |
2298 | irlap_flush_all_queues(self); | |
2299 | ||
2300 | irlap_next_state(self, LAP_NRM_S); | |
2301 | break; | |
2302 | case DISCONNECT_REQUEST: | |
2303 | irlap_wait_min_turn_around(self, &self->qos_tx); | |
2304 | irlap_send_rd_frame(self); | |
2305 | irlap_start_wd_timer(self, WD_TIMEOUT); | |
2306 | irlap_next_state(self, LAP_SCLOSE); | |
2307 | break; | |
2308 | default: | |
955a9d20 JP |
2309 | pr_debug("%s(), Unknown event %d, (%s)\n", __func__, |
2310 | event, irlap_event[event]); | |
1da177e4 LT |
2311 | |
2312 | ret = -EINVAL; | |
2313 | break; | |
2314 | } | |
2315 | return ret; | |
2316 | } |