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1 | /* |
2 | * UWB reservation management. |
3 | * |
4 | * Copyright (C) 2008 Cambridge Silicon Radio Ltd. |
5 | * |
6 | * This program is free software; you can redistribute it and/or |
7 | * modify it under the terms of the GNU General Public License version |
8 | * 2 as published by the Free Software Foundation. |
9 | * |
10 | * This program is distributed in the hope that it will be useful, |
11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
13 | * GNU General Public License for more details. |
14 | * |
15 | * You should have received a copy of the GNU General Public License |
16 | * along with this program. If not, see <http://www.gnu.org/licenses/>. |
17 | */ |
18 | #include <linux/kernel.h> |
19 | #include <linux/uwb.h> |
20 | #include <linux/slab.h> |
21 | #include <linux/random.h> |
22 | |
23 | #include "uwb-internal.h" |
24 | |
25 | static void uwb_rsv_timer(unsigned long arg); |
26 | |
27 | static const char *rsv_states[] = { |
28 | [UWB_RSV_STATE_NONE] = "none ", |
29 | [UWB_RSV_STATE_O_INITIATED] = "o initiated ", |
30 | [UWB_RSV_STATE_O_PENDING] = "o pending ", |
31 | [UWB_RSV_STATE_O_MODIFIED] = "o modified ", |
32 | [UWB_RSV_STATE_O_ESTABLISHED] = "o established ", |
33 | [UWB_RSV_STATE_O_TO_BE_MOVED] = "o to be moved ", |
34 | [UWB_RSV_STATE_O_MOVE_EXPANDING] = "o move expanding", |
35 | [UWB_RSV_STATE_O_MOVE_COMBINING] = "o move combining", |
36 | [UWB_RSV_STATE_O_MOVE_REDUCING] = "o move reducing ", |
37 | [UWB_RSV_STATE_T_ACCEPTED] = "t accepted ", |
38 | [UWB_RSV_STATE_T_CONFLICT] = "t conflict ", |
39 | [UWB_RSV_STATE_T_PENDING] = "t pending ", |
40 | [UWB_RSV_STATE_T_DENIED] = "t denied ", |
41 | [UWB_RSV_STATE_T_RESIZED] = "t resized ", |
42 | [UWB_RSV_STATE_T_EXPANDING_ACCEPTED] = "t expanding acc ", |
43 | [UWB_RSV_STATE_T_EXPANDING_CONFLICT] = "t expanding conf", |
44 | [UWB_RSV_STATE_T_EXPANDING_PENDING] = "t expanding pend", |
45 | [UWB_RSV_STATE_T_EXPANDING_DENIED] = "t expanding den ", |
46 | }; |
47 | |
48 | static const char *rsv_types[] = { |
49 | [UWB_DRP_TYPE_ALIEN_BP] = "alien-bp", |
50 | [UWB_DRP_TYPE_HARD] = "hard", |
51 | [UWB_DRP_TYPE_SOFT] = "soft", |
52 | [UWB_DRP_TYPE_PRIVATE] = "private", |
53 | [UWB_DRP_TYPE_PCA] = "pca", |
54 | }; |
55 | |
56 | bool uwb_rsv_has_two_drp_ies(struct uwb_rsv *rsv) |
57 | { |
58 | static const bool has_two_drp_ies[] = { |
59 | [UWB_RSV_STATE_O_INITIATED] = false, |
60 | [UWB_RSV_STATE_O_PENDING] = false, |
61 | [UWB_RSV_STATE_O_MODIFIED] = false, |
62 | [UWB_RSV_STATE_O_ESTABLISHED] = false, |
63 | [UWB_RSV_STATE_O_TO_BE_MOVED] = false, |
64 | [UWB_RSV_STATE_O_MOVE_COMBINING] = false, |
65 | [UWB_RSV_STATE_O_MOVE_REDUCING] = false, |
66 | [UWB_RSV_STATE_O_MOVE_EXPANDING] = true, |
67 | [UWB_RSV_STATE_T_ACCEPTED] = false, |
68 | [UWB_RSV_STATE_T_CONFLICT] = false, |
69 | [UWB_RSV_STATE_T_PENDING] = false, |
70 | [UWB_RSV_STATE_T_DENIED] = false, |
71 | [UWB_RSV_STATE_T_RESIZED] = false, |
72 | [UWB_RSV_STATE_T_EXPANDING_ACCEPTED] = true, |
73 | [UWB_RSV_STATE_T_EXPANDING_CONFLICT] = true, |
74 | [UWB_RSV_STATE_T_EXPANDING_PENDING] = true, |
75 | [UWB_RSV_STATE_T_EXPANDING_DENIED] = true, |
76 | }; |
77 | |
78 | return has_two_drp_ies[rsv->state]; |
79 | } |
80 | |
81 | /** |
82 | * uwb_rsv_state_str - return a string for a reservation state |
83 | * @state: the reservation state. |
84 | */ |
85 | const char *uwb_rsv_state_str(enum uwb_rsv_state state) |
86 | { |
87 | if (state < UWB_RSV_STATE_NONE || state >= UWB_RSV_STATE_LAST) |
88 | return "unknown"; |
89 | return rsv_states[state]; |
90 | } |
91 | EXPORT_SYMBOL_GPL(uwb_rsv_state_str); |
92 | |
93 | /** |
94 | * uwb_rsv_type_str - return a string for a reservation type |
95 | * @type: the reservation type |
96 | */ |
97 | const char *uwb_rsv_type_str(enum uwb_drp_type type) |
98 | { |
99 | if (type < UWB_DRP_TYPE_ALIEN_BP || type > UWB_DRP_TYPE_PCA) |
100 | return "invalid"; |
101 | return rsv_types[type]; |
102 | } |
103 | EXPORT_SYMBOL_GPL(uwb_rsv_type_str); |
104 | |
105 | void uwb_rsv_dump(char *text, struct uwb_rsv *rsv) |
106 | { |
107 | struct device *dev = &rsv->rc->uwb_dev.dev; |
108 | struct uwb_dev_addr devaddr; |
109 | char owner[UWB_ADDR_STRSIZE], target[UWB_ADDR_STRSIZE]; |
110 | |
111 | uwb_dev_addr_print(owner, sizeof(owner), &rsv->owner->dev_addr); |
112 | if (rsv->target.type == UWB_RSV_TARGET_DEV) |
113 | devaddr = rsv->target.dev->dev_addr; |
114 | else |
115 | devaddr = rsv->target.devaddr; |
116 | uwb_dev_addr_print(target, sizeof(target), &devaddr); |
117 | |
118 | dev_dbg(dev, "rsv %s %s -> %s: %s\n", |
119 | text, owner, target, uwb_rsv_state_str(rsv->state)); |
120 | } |
121 | |
122 | static void uwb_rsv_release(struct kref *kref) |
123 | { |
124 | struct uwb_rsv *rsv = container_of(kref, struct uwb_rsv, kref); |
125 | |
126 | kfree(rsv); |
127 | } |
128 | |
129 | void uwb_rsv_get(struct uwb_rsv *rsv) |
130 | { |
131 | kref_get(&rsv->kref); |
132 | } |
133 | |
134 | void uwb_rsv_put(struct uwb_rsv *rsv) |
135 | { |
136 | kref_put(&rsv->kref, uwb_rsv_release); |
137 | } |
138 | |
139 | /* |
140 | * Get a free stream index for a reservation. |
141 | * |
142 | * If the target is a DevAddr (e.g., a WUSB cluster reservation) then |
143 | * the stream is allocated from a pool of per-RC stream indexes, |
144 | * otherwise a unique stream index for the target is selected. |
145 | */ |
146 | static int uwb_rsv_get_stream(struct uwb_rsv *rsv) |
147 | { |
148 | struct uwb_rc *rc = rsv->rc; |
149 | struct device *dev = &rc->uwb_dev.dev; |
150 | unsigned long *streams_bm; |
151 | int stream; |
152 | |
153 | switch (rsv->target.type) { |
154 | case UWB_RSV_TARGET_DEV: |
155 | streams_bm = rsv->target.dev->streams; |
156 | break; |
157 | case UWB_RSV_TARGET_DEVADDR: |
158 | streams_bm = rc->uwb_dev.streams; |
159 | break; |
160 | default: |
161 | return -EINVAL; |
162 | } |
163 | |
164 | stream = find_first_zero_bit(streams_bm, UWB_NUM_STREAMS); |
165 | if (stream >= UWB_NUM_STREAMS) |
166 | return -EBUSY; |
167 | |
168 | rsv->stream = stream; |
169 | set_bit(stream, streams_bm); |
170 | |
171 | dev_dbg(dev, "get stream %d\n", rsv->stream); |
172 | |
173 | return 0; |
174 | } |
175 | |
176 | static void uwb_rsv_put_stream(struct uwb_rsv *rsv) |
177 | { |
178 | struct uwb_rc *rc = rsv->rc; |
179 | struct device *dev = &rc->uwb_dev.dev; |
180 | unsigned long *streams_bm; |
181 | |
182 | switch (rsv->target.type) { |
183 | case UWB_RSV_TARGET_DEV: |
184 | streams_bm = rsv->target.dev->streams; |
185 | break; |
186 | case UWB_RSV_TARGET_DEVADDR: |
187 | streams_bm = rc->uwb_dev.streams; |
188 | break; |
189 | default: |
190 | return; |
191 | } |
192 | |
193 | clear_bit(rsv->stream, streams_bm); |
194 | |
195 | dev_dbg(dev, "put stream %d\n", rsv->stream); |
196 | } |
197 | |
198 | void uwb_rsv_backoff_win_timer(unsigned long arg) |
199 | { |
200 | struct uwb_drp_backoff_win *bow = (struct uwb_drp_backoff_win *)arg; |
201 | struct uwb_rc *rc = container_of(bow, struct uwb_rc, bow); |
202 | struct device *dev = &rc->uwb_dev.dev; |
203 | |
204 | bow->can_reserve_extra_mases = true; |
205 | if (bow->total_expired <= 4) { |
206 | bow->total_expired++; |
207 | } else { |
208 | /* after 4 backoff window has expired we can exit from |
209 | * the backoff procedure */ |
210 | bow->total_expired = 0; |
211 | bow->window = UWB_DRP_BACKOFF_WIN_MIN >> 1; |
212 | } |
213 | dev_dbg(dev, "backoff_win_timer total_expired=%d, n=%d\n: ", bow->total_expired, bow->n); |
214 | |
215 | /* try to relocate all the "to be moved" relocations */ |
216 | uwb_rsv_handle_drp_avail_change(rc); |
217 | } |
218 | |
219 | void uwb_rsv_backoff_win_increment(struct uwb_rc *rc) |
220 | { |
221 | struct uwb_drp_backoff_win *bow = &rc->bow; |
222 | struct device *dev = &rc->uwb_dev.dev; |
223 | unsigned timeout_us; |
224 | |
225 | dev_dbg(dev, "backoff_win_increment: window=%d\n", bow->window); |
226 | |
227 | bow->can_reserve_extra_mases = false; |
228 | |
229 | if((bow->window << 1) == UWB_DRP_BACKOFF_WIN_MAX) |
230 | return; |
231 | |
232 | bow->window <<= 1; |
233 | bow->n = random32() & (bow->window - 1); |
234 | dev_dbg(dev, "new_window=%d, n=%d\n: ", bow->window, bow->n); |
235 | |
236 | /* reset the timer associated variables */ |
237 | timeout_us = bow->n * UWB_SUPERFRAME_LENGTH_US; |
238 | bow->total_expired = 0; |
239 | mod_timer(&bow->timer, jiffies + usecs_to_jiffies(timeout_us)); |
240 | } |
241 | |
242 | static void uwb_rsv_stroke_timer(struct uwb_rsv *rsv) |
243 | { |
244 | int sframes = UWB_MAX_LOST_BEACONS; |
245 | |
246 | /* |
247 | * Multicast reservations can become established within 1 |
248 | * super frame and should not be terminated if no response is |
249 | * received. |
250 | */ |
251 | if (rsv->is_multicast) { |
252 | if (rsv->state == UWB_RSV_STATE_O_INITIATED |
253 | || rsv->state == UWB_RSV_STATE_O_MOVE_EXPANDING |
254 | || rsv->state == UWB_RSV_STATE_O_MOVE_COMBINING |
255 | || rsv->state == UWB_RSV_STATE_O_MOVE_REDUCING) |
256 | sframes = 1; |
257 | if (rsv->state == UWB_RSV_STATE_O_ESTABLISHED) |
258 | sframes = 0; |
259 | |
260 | } |
261 | |
262 | if (sframes > 0) { |
263 | /* |
264 | * Add an additional 2 superframes to account for the |
265 | * time to send the SET DRP IE command. |
266 | */ |
267 | unsigned timeout_us = (sframes + 2) * UWB_SUPERFRAME_LENGTH_US; |
268 | mod_timer(&rsv->timer, jiffies + usecs_to_jiffies(timeout_us)); |
269 | } else |
270 | del_timer(&rsv->timer); |
271 | } |
272 | |
273 | /* |
274 | * Update a reservations state, and schedule an update of the |
275 | * transmitted DRP IEs. |
276 | */ |
277 | static void uwb_rsv_state_update(struct uwb_rsv *rsv, |
278 | enum uwb_rsv_state new_state) |
279 | { |
280 | rsv->state = new_state; |
281 | rsv->ie_valid = false; |
282 | |
283 | uwb_rsv_dump("SU", rsv); |
284 | |
285 | uwb_rsv_stroke_timer(rsv); |
286 | uwb_rsv_sched_update(rsv->rc); |
287 | } |
288 | |
289 | static void uwb_rsv_callback(struct uwb_rsv *rsv) |
290 | { |
291 | if (rsv->callback) |
292 | rsv->callback(rsv); |
293 | } |
294 | |
295 | void uwb_rsv_set_state(struct uwb_rsv *rsv, enum uwb_rsv_state new_state) |
296 | { |
297 | struct uwb_rsv_move *mv = &rsv->mv; |
298 | |
299 | if (rsv->state == new_state) { |
300 | switch (rsv->state) { |
301 | case UWB_RSV_STATE_O_ESTABLISHED: |
302 | case UWB_RSV_STATE_O_MOVE_EXPANDING: |
303 | case UWB_RSV_STATE_O_MOVE_COMBINING: |
304 | case UWB_RSV_STATE_O_MOVE_REDUCING: |
305 | case UWB_RSV_STATE_T_ACCEPTED: |
306 | case UWB_RSV_STATE_T_EXPANDING_ACCEPTED: |
307 | case UWB_RSV_STATE_T_RESIZED: |
308 | case UWB_RSV_STATE_NONE: |
309 | uwb_rsv_stroke_timer(rsv); |
310 | break; |
311 | default: |
312 | /* Expecting a state transition so leave timer |
313 | as-is. */ |
314 | break; |
315 | } |
316 | return; |
317 | } |
318 | |
319 | uwb_rsv_dump("SC", rsv); |
320 | |
321 | switch (new_state) { |
322 | case UWB_RSV_STATE_NONE: |
323 | uwb_rsv_state_update(rsv, UWB_RSV_STATE_NONE); |
324 | uwb_rsv_callback(rsv); |
325 | break; |
326 | case UWB_RSV_STATE_O_INITIATED: |
327 | uwb_rsv_state_update(rsv, UWB_RSV_STATE_O_INITIATED); |
328 | break; |
329 | case UWB_RSV_STATE_O_PENDING: |
330 | uwb_rsv_state_update(rsv, UWB_RSV_STATE_O_PENDING); |
331 | break; |
332 | case UWB_RSV_STATE_O_MODIFIED: |
333 | /* in the companion there are the MASes to drop */ |
334 | bitmap_andnot(rsv->mas.bm, rsv->mas.bm, mv->companion_mas.bm, UWB_NUM_MAS); |
335 | uwb_rsv_state_update(rsv, UWB_RSV_STATE_O_MODIFIED); |
336 | break; |
337 | case UWB_RSV_STATE_O_ESTABLISHED: |
338 | if (rsv->state == UWB_RSV_STATE_O_MODIFIED |
339 | || rsv->state == UWB_RSV_STATE_O_MOVE_REDUCING) { |
340 | uwb_drp_avail_release(rsv->rc, &mv->companion_mas); |
341 | rsv->needs_release_companion_mas = false; |
342 | } |
343 | uwb_drp_avail_reserve(rsv->rc, &rsv->mas); |
344 | uwb_rsv_state_update(rsv, UWB_RSV_STATE_O_ESTABLISHED); |
345 | uwb_rsv_callback(rsv); |
346 | break; |
347 | case UWB_RSV_STATE_O_MOVE_EXPANDING: |
348 | rsv->needs_release_companion_mas = true; |
349 | uwb_rsv_state_update(rsv, UWB_RSV_STATE_O_MOVE_EXPANDING); |
350 | break; |
351 | case UWB_RSV_STATE_O_MOVE_COMBINING: |
352 | rsv->needs_release_companion_mas = false; |
353 | uwb_drp_avail_reserve(rsv->rc, &mv->companion_mas); |
354 | bitmap_or(rsv->mas.bm, rsv->mas.bm, mv->companion_mas.bm, UWB_NUM_MAS); |
355 | rsv->mas.safe += mv->companion_mas.safe; |
356 | rsv->mas.unsafe += mv->companion_mas.unsafe; |
357 | uwb_rsv_state_update(rsv, UWB_RSV_STATE_O_MOVE_COMBINING); |
358 | break; |
359 | case UWB_RSV_STATE_O_MOVE_REDUCING: |
360 | bitmap_andnot(mv->companion_mas.bm, rsv->mas.bm, mv->final_mas.bm, UWB_NUM_MAS); |
361 | rsv->needs_release_companion_mas = true; |
362 | rsv->mas.safe = mv->final_mas.safe; |
363 | rsv->mas.unsafe = mv->final_mas.unsafe; |
364 | bitmap_copy(rsv->mas.bm, mv->final_mas.bm, UWB_NUM_MAS); |
365 | bitmap_copy(rsv->mas.unsafe_bm, mv->final_mas.unsafe_bm, UWB_NUM_MAS); |
366 | uwb_rsv_state_update(rsv, UWB_RSV_STATE_O_MOVE_REDUCING); |
367 | break; |
368 | case UWB_RSV_STATE_T_ACCEPTED: |
369 | case UWB_RSV_STATE_T_RESIZED: |
370 | rsv->needs_release_companion_mas = false; |
371 | uwb_drp_avail_reserve(rsv->rc, &rsv->mas); |
372 | uwb_rsv_state_update(rsv, UWB_RSV_STATE_T_ACCEPTED); |
373 | uwb_rsv_callback(rsv); |
374 | break; |
375 | case UWB_RSV_STATE_T_DENIED: |
376 | uwb_rsv_state_update(rsv, UWB_RSV_STATE_T_DENIED); |
377 | break; |
378 | case UWB_RSV_STATE_T_CONFLICT: |
379 | uwb_rsv_state_update(rsv, UWB_RSV_STATE_T_CONFLICT); |
380 | break; |
381 | case UWB_RSV_STATE_T_PENDING: |
382 | uwb_rsv_state_update(rsv, UWB_RSV_STATE_T_PENDING); |
383 | break; |
384 | case UWB_RSV_STATE_T_EXPANDING_ACCEPTED: |
385 | rsv->needs_release_companion_mas = true; |
386 | uwb_drp_avail_reserve(rsv->rc, &mv->companion_mas); |
387 | uwb_rsv_state_update(rsv, UWB_RSV_STATE_T_EXPANDING_ACCEPTED); |
388 | break; |
389 | default: |
390 | dev_err(&rsv->rc->uwb_dev.dev, "unhandled state: %s (%d)\n", |
391 | uwb_rsv_state_str(new_state), new_state); |
392 | } |
393 | } |
394 | |
395 | static void uwb_rsv_handle_timeout_work(struct work_struct *work) |
396 | { |
397 | struct uwb_rsv *rsv = container_of(work, struct uwb_rsv, |
398 | handle_timeout_work); |
399 | struct uwb_rc *rc = rsv->rc; |
400 | |
401 | mutex_lock(&rc->rsvs_mutex); |
402 | |
403 | uwb_rsv_dump("TO", rsv); |
404 | |
405 | switch (rsv->state) { |
406 | case UWB_RSV_STATE_O_INITIATED: |
407 | if (rsv->is_multicast) { |
408 | uwb_rsv_set_state(rsv, UWB_RSV_STATE_O_ESTABLISHED); |
409 | goto unlock; |
410 | } |
411 | break; |
412 | case UWB_RSV_STATE_O_MOVE_EXPANDING: |
413 | if (rsv->is_multicast) { |
414 | uwb_rsv_set_state(rsv, UWB_RSV_STATE_O_MOVE_COMBINING); |
415 | goto unlock; |
416 | } |
417 | break; |
418 | case UWB_RSV_STATE_O_MOVE_COMBINING: |
419 | if (rsv->is_multicast) { |
420 | uwb_rsv_set_state(rsv, UWB_RSV_STATE_O_MOVE_REDUCING); |
421 | goto unlock; |
422 | } |
423 | break; |
424 | case UWB_RSV_STATE_O_MOVE_REDUCING: |
425 | if (rsv->is_multicast) { |
426 | uwb_rsv_set_state(rsv, UWB_RSV_STATE_O_ESTABLISHED); |
427 | goto unlock; |
428 | } |
429 | break; |
430 | case UWB_RSV_STATE_O_ESTABLISHED: |
431 | if (rsv->is_multicast) |
432 | goto unlock; |
433 | break; |
434 | case UWB_RSV_STATE_T_EXPANDING_ACCEPTED: |
435 | /* |
436 | * The time out could be for the main or of the |
437 | * companion DRP, assume it's for the companion and |
438 | * drop that first. A further time out is required to |
439 | * drop the main. |
440 | */ |
441 | uwb_rsv_set_state(rsv, UWB_RSV_STATE_T_ACCEPTED); |
442 | uwb_drp_avail_release(rsv->rc, &rsv->mv.companion_mas); |
443 | goto unlock; |
444 | default: |
445 | break; |
446 | } |
447 | |
448 | uwb_rsv_remove(rsv); |
449 | |
450 | unlock: |
451 | mutex_unlock(&rc->rsvs_mutex); |
452 | } |
453 | |
454 | static struct uwb_rsv *uwb_rsv_alloc(struct uwb_rc *rc) |
455 | { |
456 | struct uwb_rsv *rsv; |
457 | |
458 | rsv = kzalloc(sizeof(struct uwb_rsv), GFP_KERNEL); |
459 | if (!rsv) |
460 | return NULL; |
461 | |
462 | INIT_LIST_HEAD(&rsv->rc_node); |
463 | INIT_LIST_HEAD(&rsv->pal_node); |
464 | kref_init(&rsv->kref); |
465 | init_timer(&rsv->timer); |
466 | rsv->timer.function = uwb_rsv_timer; |
467 | rsv->timer.data = (unsigned long)rsv; |
468 | |
469 | rsv->rc = rc; |
470 | INIT_WORK(&rsv->handle_timeout_work, uwb_rsv_handle_timeout_work); |
471 | |
472 | return rsv; |
473 | } |
474 | |
475 | /** |
476 | * uwb_rsv_create - allocate and initialize a UWB reservation structure |
477 | * @rc: the radio controller |
478 | * @cb: callback to use when the reservation completes or terminates |
479 | * @pal_priv: data private to the PAL to be passed in the callback |
480 | * |
481 | * The callback is called when the state of the reservation changes from: |
482 | * |
483 | * - pending to accepted |
484 | * - pending to denined |
485 | * - accepted to terminated |
486 | * - pending to terminated |
487 | */ |
488 | struct uwb_rsv *uwb_rsv_create(struct uwb_rc *rc, uwb_rsv_cb_f cb, void *pal_priv) |
489 | { |
490 | struct uwb_rsv *rsv; |
491 | |
492 | rsv = uwb_rsv_alloc(rc); |
493 | if (!rsv) |
494 | return NULL; |
495 | |
496 | rsv->callback = cb; |
497 | rsv->pal_priv = pal_priv; |
498 | |
499 | return rsv; |
500 | } |
501 | EXPORT_SYMBOL_GPL(uwb_rsv_create); |
502 | |
503 | void uwb_rsv_remove(struct uwb_rsv *rsv) |
504 | { |
505 | uwb_rsv_dump("RM", rsv); |
506 | |
507 | if (rsv->state != UWB_RSV_STATE_NONE) |
508 | uwb_rsv_set_state(rsv, UWB_RSV_STATE_NONE); |
509 | |
510 | if (rsv->needs_release_companion_mas) |
511 | uwb_drp_avail_release(rsv->rc, &rsv->mv.companion_mas); |
512 | uwb_drp_avail_release(rsv->rc, &rsv->mas); |
513 | |
514 | if (uwb_rsv_is_owner(rsv)) |
515 | uwb_rsv_put_stream(rsv); |
516 | |
517 | uwb_dev_put(rsv->owner); |
518 | if (rsv->target.type == UWB_RSV_TARGET_DEV) |
519 | uwb_dev_put(rsv->target.dev); |
520 | |
521 | list_del_init(&rsv->rc_node); |
522 | uwb_rsv_put(rsv); |
523 | } |
524 | |
525 | /** |
526 | * uwb_rsv_destroy - free a UWB reservation structure |
527 | * @rsv: the reservation to free |
528 | * |
529 | * The reservation must already be terminated. |
530 | */ |
531 | void uwb_rsv_destroy(struct uwb_rsv *rsv) |
532 | { |
533 | uwb_rsv_put(rsv); |
534 | } |
535 | EXPORT_SYMBOL_GPL(uwb_rsv_destroy); |
536 | |
537 | /** |
538 | * usb_rsv_establish - start a reservation establishment |
539 | * @rsv: the reservation |
540 | * |
541 | * The PAL should fill in @rsv's owner, target, type, max_mas, |
542 | * min_mas, max_interval and is_multicast fields. If the target is a |
543 | * uwb_dev it must be referenced. |
544 | * |
545 | * The reservation's callback will be called when the reservation is |
546 | * accepted, denied or times out. |
547 | */ |
548 | int uwb_rsv_establish(struct uwb_rsv *rsv) |
549 | { |
550 | struct uwb_rc *rc = rsv->rc; |
551 | struct uwb_mas_bm available; |
552 | int ret; |
553 | |
554 | mutex_lock(&rc->rsvs_mutex); |
555 | ret = uwb_rsv_get_stream(rsv); |
556 | if (ret) |
557 | goto out; |
558 | |
559 | rsv->tiebreaker = random32() & 1; |
560 | /* get available mas bitmap */ |
561 | uwb_drp_available(rc, &available); |
562 | |
563 | ret = uwb_rsv_find_best_allocation(rsv, &available, &rsv->mas); |
564 | if (ret == UWB_RSV_ALLOC_NOT_FOUND) { |
565 | ret = -EBUSY; |
566 | uwb_rsv_put_stream(rsv); |
567 | goto out; |
568 | } |
569 | |
570 | ret = uwb_drp_avail_reserve_pending(rc, &rsv->mas); |
571 | if (ret != 0) { |
572 | uwb_rsv_put_stream(rsv); |
573 | goto out; |
574 | } |
575 | |
576 | uwb_rsv_get(rsv); |
577 | list_add_tail(&rsv->rc_node, &rc->reservations); |
578 | rsv->owner = &rc->uwb_dev; |
579 | uwb_dev_get(rsv->owner); |
580 | uwb_rsv_set_state(rsv, UWB_RSV_STATE_O_INITIATED); |
581 | out: |
582 | mutex_unlock(&rc->rsvs_mutex); |
583 | return ret; |
584 | } |
585 | EXPORT_SYMBOL_GPL(uwb_rsv_establish); |
586 | |
587 | /** |
588 | * uwb_rsv_modify - modify an already established reservation |
589 | * @rsv: the reservation to modify |
590 | * @max_mas: new maximum MAS to reserve |
591 | * @min_mas: new minimum MAS to reserve |
592 | * @max_interval: new max_interval to use |
593 | * |
594 | * FIXME: implement this once there are PALs that use it. |
595 | */ |
596 | int uwb_rsv_modify(struct uwb_rsv *rsv, int max_mas, int min_mas, int max_interval) |
597 | { |
598 | return -ENOSYS; |
599 | } |
600 | EXPORT_SYMBOL_GPL(uwb_rsv_modify); |
601 | |
602 | /* |
603 | * move an already established reservation (rc->rsvs_mutex must to be |
604 | * taken when tis function is called) |
605 | */ |
606 | int uwb_rsv_try_move(struct uwb_rsv *rsv, struct uwb_mas_bm *available) |
607 | { |
608 | struct uwb_rc *rc = rsv->rc; |
609 | struct uwb_drp_backoff_win *bow = &rc->bow; |
610 | struct device *dev = &rc->uwb_dev.dev; |
611 | struct uwb_rsv_move *mv; |
612 | int ret = 0; |
613 | |
614 | if (bow->can_reserve_extra_mases == false) |
615 | return -EBUSY; |
616 | |
617 | mv = &rsv->mv; |
618 | |
619 | if (uwb_rsv_find_best_allocation(rsv, available, &mv->final_mas) == UWB_RSV_ALLOC_FOUND) { |
620 | |
621 | if (!bitmap_equal(rsv->mas.bm, mv->final_mas.bm, UWB_NUM_MAS)) { |
622 | /* We want to move the reservation */ |
623 | bitmap_andnot(mv->companion_mas.bm, mv->final_mas.bm, rsv->mas.bm, UWB_NUM_MAS); |
624 | uwb_drp_avail_reserve_pending(rc, &mv->companion_mas); |
625 | uwb_rsv_set_state(rsv, UWB_RSV_STATE_O_MOVE_EXPANDING); |
626 | } |
627 | } else { |
628 | dev_dbg(dev, "new allocation not found\n"); |
629 | } |
630 | |
631 | return ret; |
632 | } |
633 | |
634 | /* It will try to move every reservation in state O_ESTABLISHED giving |
635 | * to the MAS allocator algorithm an availability that is the real one |
636 | * plus the allocation already established from the reservation. */ |
637 | void uwb_rsv_handle_drp_avail_change(struct uwb_rc *rc) |
638 | { |
639 | struct uwb_drp_backoff_win *bow = &rc->bow; |
640 | struct uwb_rsv *rsv; |
641 | struct uwb_mas_bm mas; |
642 | |
643 | if (bow->can_reserve_extra_mases == false) |
644 | return; |
645 | |
646 | list_for_each_entry(rsv, &rc->reservations, rc_node) { |
647 | if (rsv->state == UWB_RSV_STATE_O_ESTABLISHED || |
648 | rsv->state == UWB_RSV_STATE_O_TO_BE_MOVED) { |
649 | uwb_drp_available(rc, &mas); |
650 | bitmap_or(mas.bm, mas.bm, rsv->mas.bm, UWB_NUM_MAS); |
651 | uwb_rsv_try_move(rsv, &mas); |
652 | } |
653 | } |
654 | |
655 | } |
656 | |
657 | /** |
658 | * uwb_rsv_terminate - terminate an established reservation |
659 | * @rsv: the reservation to terminate |
660 | * |
661 | * A reservation is terminated by removing the DRP IE from the beacon, |
662 | * the other end will consider the reservation to be terminated when |
663 | * it does not see the DRP IE for at least mMaxLostBeacons. |
664 | * |
665 | * If applicable, the reference to the target uwb_dev will be released. |
666 | */ |
667 | void uwb_rsv_terminate(struct uwb_rsv *rsv) |
668 | { |
669 | struct uwb_rc *rc = rsv->rc; |
670 | |
671 | mutex_lock(&rc->rsvs_mutex); |
672 | |
673 | if (rsv->state != UWB_RSV_STATE_NONE) |
674 | uwb_rsv_set_state(rsv, UWB_RSV_STATE_NONE); |
675 | |
676 | mutex_unlock(&rc->rsvs_mutex); |
677 | } |
678 | EXPORT_SYMBOL_GPL(uwb_rsv_terminate); |
679 | |
680 | /** |
681 | * uwb_rsv_accept - accept a new reservation from a peer |
682 | * @rsv: the reservation |
683 | * @cb: call back for reservation changes |
684 | * @pal_priv: data to be passed in the above call back |
685 | * |
686 | * Reservation requests from peers are denied unless a PAL accepts it |
687 | * by calling this function. |
688 | * |
689 | * The PAL call uwb_rsv_destroy() for all accepted reservations before |
690 | * calling uwb_pal_unregister(). |
691 | */ |
692 | void uwb_rsv_accept(struct uwb_rsv *rsv, uwb_rsv_cb_f cb, void *pal_priv) |
693 | { |
694 | uwb_rsv_get(rsv); |
695 | |
696 | rsv->callback = cb; |
697 | rsv->pal_priv = pal_priv; |
698 | rsv->state = UWB_RSV_STATE_T_ACCEPTED; |
699 | } |
700 | EXPORT_SYMBOL_GPL(uwb_rsv_accept); |
701 | |
702 | /* |
703 | * Is a received DRP IE for this reservation? |
704 | */ |
705 | static bool uwb_rsv_match(struct uwb_rsv *rsv, struct uwb_dev *src, |
706 | struct uwb_ie_drp *drp_ie) |
707 | { |
708 | struct uwb_dev_addr *rsv_src; |
709 | int stream; |
710 | |
711 | stream = uwb_ie_drp_stream_index(drp_ie); |
712 | |
713 | if (rsv->stream != stream) |
714 | return false; |
715 | |
716 | switch (rsv->target.type) { |
717 | case UWB_RSV_TARGET_DEVADDR: |
718 | return rsv->stream == stream; |
719 | case UWB_RSV_TARGET_DEV: |
720 | if (uwb_ie_drp_owner(drp_ie)) |
721 | rsv_src = &rsv->owner->dev_addr; |
722 | else |
723 | rsv_src = &rsv->target.dev->dev_addr; |
724 | return uwb_dev_addr_cmp(&src->dev_addr, rsv_src) == 0; |
725 | } |
726 | return false; |
727 | } |
728 | |
729 | static struct uwb_rsv *uwb_rsv_new_target(struct uwb_rc *rc, |
730 | struct uwb_dev *src, |
731 | struct uwb_ie_drp *drp_ie) |
732 | { |
733 | struct uwb_rsv *rsv; |
734 | struct uwb_pal *pal; |
735 | enum uwb_rsv_state state; |
736 | |
737 | rsv = uwb_rsv_alloc(rc); |
738 | if (!rsv) |
739 | return NULL; |
740 | |
741 | rsv->rc = rc; |
742 | rsv->owner = src; |
743 | uwb_dev_get(rsv->owner); |
744 | rsv->target.type = UWB_RSV_TARGET_DEV; |
745 | rsv->target.dev = &rc->uwb_dev; |
746 | uwb_dev_get(&rc->uwb_dev); |
747 | rsv->type = uwb_ie_drp_type(drp_ie); |
748 | rsv->stream = uwb_ie_drp_stream_index(drp_ie); |
749 | uwb_drp_ie_to_bm(&rsv->mas, drp_ie); |
750 | |
751 | /* |
752 | * See if any PALs are interested in this reservation. If not, |
753 | * deny the request. |
754 | */ |
755 | rsv->state = UWB_RSV_STATE_T_DENIED; |
756 | mutex_lock(&rc->uwb_dev.mutex); |
757 | list_for_each_entry(pal, &rc->pals, node) { |
758 | if (pal->new_rsv) |
759 | pal->new_rsv(pal, rsv); |
760 | if (rsv->state == UWB_RSV_STATE_T_ACCEPTED) |
761 | break; |
762 | } |
763 | mutex_unlock(&rc->uwb_dev.mutex); |
764 | |
765 | list_add_tail(&rsv->rc_node, &rc->reservations); |
766 | state = rsv->state; |
767 | rsv->state = UWB_RSV_STATE_NONE; |
768 | |
769 | /* FIXME: do something sensible here */ |
770 | if (state == UWB_RSV_STATE_T_ACCEPTED |
771 | && uwb_drp_avail_reserve_pending(rc, &rsv->mas) == -EBUSY) { |
772 | /* FIXME: do something sensible here */ |
773 | } else { |
774 | uwb_rsv_set_state(rsv, state); |
775 | } |
776 | |
777 | return rsv; |
778 | } |
779 | |
780 | /** |
781 | * uwb_rsv_get_usable_mas - get the bitmap of the usable MAS of a reservations |
782 | * @rsv: the reservation. |
783 | * @mas: returns the available MAS. |
784 | * |
785 | * The usable MAS of a reservation may be less than the negotiated MAS |
786 | * if alien BPs are present. |
787 | */ |
788 | void uwb_rsv_get_usable_mas(struct uwb_rsv *rsv, struct uwb_mas_bm *mas) |
789 | { |
790 | bitmap_zero(mas->bm, UWB_NUM_MAS); |
791 | bitmap_andnot(mas->bm, rsv->mas.bm, rsv->rc->cnflt_alien_bitmap.bm, UWB_NUM_MAS); |
792 | } |
793 | EXPORT_SYMBOL_GPL(uwb_rsv_get_usable_mas); |
794 | |
795 | /** |
796 | * uwb_rsv_find - find a reservation for a received DRP IE. |
797 | * @rc: the radio controller |
798 | * @src: source of the DRP IE |
799 | * @drp_ie: the DRP IE |
800 | * |
801 | * If the reservation cannot be found and the DRP IE is from a peer |
802 | * attempting to establish a new reservation, create a new reservation |
803 | * and add it to the list. |
804 | */ |
805 | struct uwb_rsv *uwb_rsv_find(struct uwb_rc *rc, struct uwb_dev *src, |
806 | struct uwb_ie_drp *drp_ie) |
807 | { |
808 | struct uwb_rsv *rsv; |
809 | |
810 | list_for_each_entry(rsv, &rc->reservations, rc_node) { |
811 | if (uwb_rsv_match(rsv, src, drp_ie)) |
812 | return rsv; |
813 | } |
814 | |
815 | if (uwb_ie_drp_owner(drp_ie)) |
816 | return uwb_rsv_new_target(rc, src, drp_ie); |
817 | |
818 | return NULL; |
819 | } |
820 | |
821 | /* |
822 | * Go through all the reservations and check for timeouts and (if |
823 | * necessary) update their DRP IEs. |
824 | * |
825 | * FIXME: look at building the SET_DRP_IE command here rather than |
826 | * having to rescan the list in uwb_rc_send_all_drp_ie(). |
827 | */ |
828 | static bool uwb_rsv_update_all(struct uwb_rc *rc) |
829 | { |
830 | struct uwb_rsv *rsv, *t; |
831 | bool ie_updated = false; |
832 | |
833 | list_for_each_entry_safe(rsv, t, &rc->reservations, rc_node) { |
834 | if (!rsv->ie_valid) { |
835 | uwb_drp_ie_update(rsv); |
836 | ie_updated = true; |
837 | } |
838 | } |
839 | |
840 | return ie_updated; |
841 | } |
842 | |
843 | void uwb_rsv_queue_update(struct uwb_rc *rc) |
844 | { |
845 | unsigned long delay_us = UWB_MAS_LENGTH_US * UWB_MAS_PER_ZONE; |
846 | |
847 | queue_delayed_work(rc->rsv_workq, &rc->rsv_update_work, usecs_to_jiffies(delay_us)); |
848 | } |
849 | |
850 | /** |
851 | * uwb_rsv_sched_update - schedule an update of the DRP IEs |
852 | * @rc: the radio controller. |
853 | * |
854 | * To improve performance and ensure correctness with [ECMA-368] the |
855 | * number of SET-DRP-IE commands that are done are limited. |
856 | * |
857 | * DRP IEs update come from two sources: DRP events from the hardware |
858 | * which all occur at the beginning of the superframe ('syncronous' |
859 | * events) and reservation establishment/termination requests from |
860 | * PALs or timers ('asynchronous' events). |
861 | * |
862 | * A delayed work ensures that all the synchronous events result in |
863 | * one SET-DRP-IE command. |
864 | * |
865 | * Additional logic (the set_drp_ie_pending and rsv_updated_postponed |
866 | * flags) will prevent an asynchrous event starting a SET-DRP-IE |
867 | * command if one is currently awaiting a response. |
868 | * |
869 | * FIXME: this does leave a window where an asynchrous event can delay |
870 | * the SET-DRP-IE for a synchronous event by one superframe. |
871 | */ |
872 | void uwb_rsv_sched_update(struct uwb_rc *rc) |
873 | { |
874 | spin_lock_bh(&rc->rsvs_lock); |
875 | if (!delayed_work_pending(&rc->rsv_update_work)) { |
876 | if (rc->set_drp_ie_pending > 0) { |
877 | rc->set_drp_ie_pending++; |
878 | goto unlock; |
879 | } |
880 | uwb_rsv_queue_update(rc); |
881 | } |
882 | unlock: |
883 | spin_unlock_bh(&rc->rsvs_lock); |
884 | } |
885 | |
886 | /* |
887 | * Update DRP IEs and, if necessary, the DRP Availability IE and send |
888 | * the updated IEs to the radio controller. |
889 | */ |
890 | static void uwb_rsv_update_work(struct work_struct *work) |
891 | { |
892 | struct uwb_rc *rc = container_of(work, struct uwb_rc, |
893 | rsv_update_work.work); |
894 | bool ie_updated; |
895 | |
896 | mutex_lock(&rc->rsvs_mutex); |
897 | |
898 | ie_updated = uwb_rsv_update_all(rc); |
899 | |
900 | if (!rc->drp_avail.ie_valid) { |
901 | uwb_drp_avail_ie_update(rc); |
902 | ie_updated = true; |
903 | } |
904 | |
905 | if (ie_updated && (rc->set_drp_ie_pending == 0)) |
906 | uwb_rc_send_all_drp_ie(rc); |
907 | |
908 | mutex_unlock(&rc->rsvs_mutex); |
909 | } |
910 | |
911 | static void uwb_rsv_alien_bp_work(struct work_struct *work) |
912 | { |
913 | struct uwb_rc *rc = container_of(work, struct uwb_rc, |
914 | rsv_alien_bp_work.work); |
915 | struct uwb_rsv *rsv; |
916 | |
917 | mutex_lock(&rc->rsvs_mutex); |
918 | |
919 | list_for_each_entry(rsv, &rc->reservations, rc_node) { |
920 | if (rsv->type != UWB_DRP_TYPE_ALIEN_BP) { |
921 | rsv->callback(rsv); |
922 | } |
923 | } |
924 | |
925 | mutex_unlock(&rc->rsvs_mutex); |
926 | } |
927 | |
928 | static void uwb_rsv_timer(unsigned long arg) |
929 | { |
930 | struct uwb_rsv *rsv = (struct uwb_rsv *)arg; |
931 | |
932 | queue_work(rsv->rc->rsv_workq, &rsv->handle_timeout_work); |
933 | } |
934 | |
935 | /** |
936 | * uwb_rsv_remove_all - remove all reservations |
937 | * @rc: the radio controller |
938 | * |
939 | * A DRP IE update is not done. |
940 | */ |
941 | void uwb_rsv_remove_all(struct uwb_rc *rc) |
942 | { |
943 | struct uwb_rsv *rsv, *t; |
944 | |
945 | mutex_lock(&rc->rsvs_mutex); |
946 | list_for_each_entry_safe(rsv, t, &rc->reservations, rc_node) { |
947 | if (rsv->state != UWB_RSV_STATE_NONE) |
948 | uwb_rsv_set_state(rsv, UWB_RSV_STATE_NONE); |
949 | del_timer_sync(&rsv->timer); |
950 | } |
951 | /* Cancel any postponed update. */ |
952 | rc->set_drp_ie_pending = 0; |
953 | mutex_unlock(&rc->rsvs_mutex); |
954 | |
955 | cancel_delayed_work_sync(&rc->rsv_update_work); |
956 | flush_workqueue(rc->rsv_workq); |
957 | |
958 | mutex_lock(&rc->rsvs_mutex); |
959 | list_for_each_entry_safe(rsv, t, &rc->reservations, rc_node) { |
960 | uwb_rsv_remove(rsv); |
961 | } |
962 | mutex_unlock(&rc->rsvs_mutex); |
963 | } |
964 | |
965 | void uwb_rsv_init(struct uwb_rc *rc) |
966 | { |
967 | INIT_LIST_HEAD(&rc->reservations); |
968 | INIT_LIST_HEAD(&rc->cnflt_alien_list); |
969 | mutex_init(&rc->rsvs_mutex); |
970 | spin_lock_init(&rc->rsvs_lock); |
971 | INIT_DELAYED_WORK(&rc->rsv_update_work, uwb_rsv_update_work); |
972 | INIT_DELAYED_WORK(&rc->rsv_alien_bp_work, uwb_rsv_alien_bp_work); |
973 | rc->bow.can_reserve_extra_mases = true; |
974 | rc->bow.total_expired = 0; |
975 | rc->bow.window = UWB_DRP_BACKOFF_WIN_MIN >> 1; |
976 | init_timer(&rc->bow.timer); |
977 | rc->bow.timer.function = uwb_rsv_backoff_win_timer; |
978 | rc->bow.timer.data = (unsigned long)&rc->bow; |
979 | |
980 | bitmap_complement(rc->uwb_dev.streams, rc->uwb_dev.streams, UWB_NUM_STREAMS); |
981 | } |
982 | |
983 | int uwb_rsv_setup(struct uwb_rc *rc) |
984 | { |
985 | char name[16]; |
986 | |
987 | snprintf(name, sizeof(name), "%s_rsvd", dev_name(&rc->uwb_dev.dev)); |
988 | rc->rsv_workq = create_singlethread_workqueue(name); |
989 | if (rc->rsv_workq == NULL) |
990 | return -ENOMEM; |
991 | |
992 | return 0; |
993 | } |
994 | |
995 | void uwb_rsv_cleanup(struct uwb_rc *rc) |
996 | { |
997 | uwb_rsv_remove_all(rc); |
998 | destroy_workqueue(rc->rsv_workq); |
999 | } |
1000 |
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