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8cc13a09 DV |
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/version.h> | |
19 | #include <linux/kernel.h> | |
20 | #include <linux/uwb.h> | |
21 | ||
22 | #include "uwb-internal.h" | |
23 | ||
24 | static void uwb_rsv_timer(unsigned long arg); | |
25 | ||
26 | static const char *rsv_states[] = { | |
27 | [UWB_RSV_STATE_NONE] = "none", | |
28 | [UWB_RSV_STATE_O_INITIATED] = "initiated", | |
29 | [UWB_RSV_STATE_O_PENDING] = "pending", | |
30 | [UWB_RSV_STATE_O_MODIFIED] = "modified", | |
31 | [UWB_RSV_STATE_O_ESTABLISHED] = "established", | |
32 | [UWB_RSV_STATE_T_ACCEPTED] = "accepted", | |
33 | [UWB_RSV_STATE_T_DENIED] = "denied", | |
34 | [UWB_RSV_STATE_T_PENDING] = "pending", | |
35 | }; | |
36 | ||
37 | static const char *rsv_types[] = { | |
38 | [UWB_DRP_TYPE_ALIEN_BP] = "alien-bp", | |
39 | [UWB_DRP_TYPE_HARD] = "hard", | |
40 | [UWB_DRP_TYPE_SOFT] = "soft", | |
41 | [UWB_DRP_TYPE_PRIVATE] = "private", | |
42 | [UWB_DRP_TYPE_PCA] = "pca", | |
43 | }; | |
44 | ||
45 | /** | |
46 | * uwb_rsv_state_str - return a string for a reservation state | |
47 | * @state: the reservation state. | |
48 | */ | |
49 | const char *uwb_rsv_state_str(enum uwb_rsv_state state) | |
50 | { | |
51 | if (state < UWB_RSV_STATE_NONE || state >= UWB_RSV_STATE_LAST) | |
52 | return "unknown"; | |
53 | return rsv_states[state]; | |
54 | } | |
55 | EXPORT_SYMBOL_GPL(uwb_rsv_state_str); | |
56 | ||
57 | /** | |
58 | * uwb_rsv_type_str - return a string for a reservation type | |
59 | * @type: the reservation type | |
60 | */ | |
61 | const char *uwb_rsv_type_str(enum uwb_drp_type type) | |
62 | { | |
63 | if (type < UWB_DRP_TYPE_ALIEN_BP || type > UWB_DRP_TYPE_PCA) | |
64 | return "invalid"; | |
65 | return rsv_types[type]; | |
66 | } | |
67 | EXPORT_SYMBOL_GPL(uwb_rsv_type_str); | |
68 | ||
69 | static void uwb_rsv_dump(struct uwb_rsv *rsv) | |
70 | { | |
71 | struct device *dev = &rsv->rc->uwb_dev.dev; | |
72 | struct uwb_dev_addr devaddr; | |
73 | char owner[UWB_ADDR_STRSIZE], target[UWB_ADDR_STRSIZE]; | |
74 | ||
75 | uwb_dev_addr_print(owner, sizeof(owner), &rsv->owner->dev_addr); | |
76 | if (rsv->target.type == UWB_RSV_TARGET_DEV) | |
77 | devaddr = rsv->target.dev->dev_addr; | |
78 | else | |
79 | devaddr = rsv->target.devaddr; | |
80 | uwb_dev_addr_print(target, sizeof(target), &devaddr); | |
81 | ||
82 | dev_dbg(dev, "rsv %s -> %s: %s\n", owner, target, uwb_rsv_state_str(rsv->state)); | |
83 | } | |
84 | ||
85 | /* | |
86 | * Get a free stream index for a reservation. | |
87 | * | |
88 | * If the target is a DevAddr (e.g., a WUSB cluster reservation) then | |
89 | * the stream is allocated from a pool of per-RC stream indexes, | |
90 | * otherwise a unique stream index for the target is selected. | |
91 | */ | |
92 | static int uwb_rsv_get_stream(struct uwb_rsv *rsv) | |
93 | { | |
94 | struct uwb_rc *rc = rsv->rc; | |
95 | unsigned long *streams_bm; | |
96 | int stream; | |
97 | ||
98 | switch (rsv->target.type) { | |
99 | case UWB_RSV_TARGET_DEV: | |
100 | streams_bm = rsv->target.dev->streams; | |
101 | break; | |
102 | case UWB_RSV_TARGET_DEVADDR: | |
103 | streams_bm = rc->uwb_dev.streams; | |
104 | break; | |
105 | default: | |
106 | return -EINVAL; | |
107 | } | |
108 | ||
109 | stream = find_first_zero_bit(streams_bm, UWB_NUM_STREAMS); | |
110 | if (stream >= UWB_NUM_STREAMS) | |
111 | return -EBUSY; | |
112 | ||
113 | rsv->stream = stream; | |
114 | set_bit(stream, streams_bm); | |
115 | ||
116 | return 0; | |
117 | } | |
118 | ||
119 | static void uwb_rsv_put_stream(struct uwb_rsv *rsv) | |
120 | { | |
121 | struct uwb_rc *rc = rsv->rc; | |
122 | unsigned long *streams_bm; | |
123 | ||
124 | switch (rsv->target.type) { | |
125 | case UWB_RSV_TARGET_DEV: | |
126 | streams_bm = rsv->target.dev->streams; | |
127 | break; | |
128 | case UWB_RSV_TARGET_DEVADDR: | |
129 | streams_bm = rc->uwb_dev.streams; | |
130 | break; | |
131 | default: | |
132 | return; | |
133 | } | |
134 | ||
135 | clear_bit(rsv->stream, streams_bm); | |
136 | } | |
137 | ||
138 | /* | |
139 | * Generate a MAS allocation with a single row component. | |
140 | */ | |
141 | static void uwb_rsv_gen_alloc_row(struct uwb_mas_bm *mas, | |
142 | int first_mas, int mas_per_zone, | |
143 | int zs, int ze) | |
144 | { | |
145 | struct uwb_mas_bm col; | |
146 | int z; | |
147 | ||
148 | bitmap_zero(mas->bm, UWB_NUM_MAS); | |
149 | bitmap_zero(col.bm, UWB_NUM_MAS); | |
150 | bitmap_fill(col.bm, mas_per_zone); | |
151 | bitmap_shift_left(col.bm, col.bm, first_mas + zs * UWB_MAS_PER_ZONE, UWB_NUM_MAS); | |
152 | ||
153 | for (z = zs; z <= ze; z++) { | |
154 | bitmap_or(mas->bm, mas->bm, col.bm, UWB_NUM_MAS); | |
155 | bitmap_shift_left(col.bm, col.bm, UWB_MAS_PER_ZONE, UWB_NUM_MAS); | |
156 | } | |
157 | } | |
158 | ||
159 | /* | |
160 | * Allocate some MAS for this reservation based on current local | |
161 | * availability, the reservation parameters (max_mas, min_mas, | |
162 | * sparsity), and the WiMedia rules for MAS allocations. | |
163 | * | |
164 | * Returns -EBUSY is insufficient free MAS are available. | |
165 | * | |
166 | * FIXME: to simplify this, only safe reservations with a single row | |
167 | * component in zones 1 to 15 are tried (zone 0 is skipped to avoid | |
168 | * problems with the MAS reserved for the BP). | |
169 | * | |
170 | * [ECMA-368] section B.2. | |
171 | */ | |
172 | static int uwb_rsv_alloc_mas(struct uwb_rsv *rsv) | |
173 | { | |
174 | static const int safe_mas_in_row[UWB_NUM_ZONES] = { | |
175 | 8, 7, 6, 5, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 2, 1, | |
176 | }; | |
177 | int n, r; | |
178 | struct uwb_mas_bm mas; | |
179 | bool found = false; | |
180 | ||
181 | /* | |
182 | * Search all valid safe allocations until either: too few MAS | |
183 | * are available; or the smallest allocation with sufficient | |
184 | * MAS is found. | |
185 | * | |
186 | * The top of the zones are preferred, so space for larger | |
187 | * allocations is available in the bottom of the zone (e.g., a | |
188 | * 15 MAS allocation should start in row 14 leaving space for | |
189 | * a 120 MAS allocation at row 0). | |
190 | */ | |
191 | for (n = safe_mas_in_row[0]; n >= 1; n--) { | |
192 | int num_mas; | |
193 | ||
194 | num_mas = n * (UWB_NUM_ZONES - 1); | |
195 | if (num_mas < rsv->min_mas) | |
196 | break; | |
197 | if (found && num_mas < rsv->max_mas) | |
198 | break; | |
199 | ||
200 | for (r = UWB_MAS_PER_ZONE-1; r >= 0; r--) { | |
201 | if (safe_mas_in_row[r] < n) | |
202 | continue; | |
203 | uwb_rsv_gen_alloc_row(&mas, r, n, 1, UWB_NUM_ZONES); | |
204 | if (uwb_drp_avail_reserve_pending(rsv->rc, &mas) == 0) { | |
205 | found = true; | |
206 | break; | |
207 | } | |
208 | } | |
209 | } | |
210 | ||
211 | if (!found) | |
212 | return -EBUSY; | |
213 | ||
214 | bitmap_copy(rsv->mas.bm, mas.bm, UWB_NUM_MAS); | |
215 | return 0; | |
216 | } | |
217 | ||
218 | static void uwb_rsv_stroke_timer(struct uwb_rsv *rsv) | |
219 | { | |
220 | int sframes = UWB_MAX_LOST_BEACONS; | |
221 | ||
222 | /* | |
223 | * Multicast reservations can become established within 1 | |
224 | * super frame and should not be terminated if no response is | |
225 | * received. | |
226 | */ | |
227 | if (rsv->is_multicast) { | |
228 | if (rsv->state == UWB_RSV_STATE_O_INITIATED) | |
229 | sframes = 1; | |
230 | if (rsv->state == UWB_RSV_STATE_O_ESTABLISHED) | |
231 | sframes = 0; | |
232 | } | |
233 | ||
234 | rsv->expired = false; | |
235 | if (sframes > 0) { | |
236 | /* | |
237 | * Add an additional 2 superframes to account for the | |
238 | * time to send the SET DRP IE command. | |
239 | */ | |
240 | unsigned timeout_us = (sframes + 2) * UWB_SUPERFRAME_LENGTH_US; | |
241 | mod_timer(&rsv->timer, jiffies + usecs_to_jiffies(timeout_us)); | |
242 | } else | |
243 | del_timer(&rsv->timer); | |
244 | } | |
245 | ||
246 | /* | |
247 | * Update a reservations state, and schedule an update of the | |
248 | * transmitted DRP IEs. | |
249 | */ | |
250 | static void uwb_rsv_state_update(struct uwb_rsv *rsv, | |
251 | enum uwb_rsv_state new_state) | |
252 | { | |
253 | rsv->state = new_state; | |
254 | rsv->ie_valid = false; | |
255 | ||
256 | uwb_rsv_dump(rsv); | |
257 | ||
258 | uwb_rsv_stroke_timer(rsv); | |
259 | uwb_rsv_sched_update(rsv->rc); | |
260 | } | |
261 | ||
262 | static void uwb_rsv_callback(struct uwb_rsv *rsv) | |
263 | { | |
264 | if (rsv->callback) | |
265 | rsv->callback(rsv); | |
266 | } | |
267 | ||
268 | void uwb_rsv_set_state(struct uwb_rsv *rsv, enum uwb_rsv_state new_state) | |
269 | { | |
270 | if (rsv->state == new_state) { | |
271 | switch (rsv->state) { | |
272 | case UWB_RSV_STATE_O_ESTABLISHED: | |
273 | case UWB_RSV_STATE_T_ACCEPTED: | |
274 | case UWB_RSV_STATE_NONE: | |
275 | uwb_rsv_stroke_timer(rsv); | |
276 | break; | |
277 | default: | |
278 | /* Expecting a state transition so leave timer | |
279 | as-is. */ | |
280 | break; | |
281 | } | |
282 | return; | |
283 | } | |
284 | ||
285 | switch (new_state) { | |
286 | case UWB_RSV_STATE_NONE: | |
287 | uwb_drp_avail_release(rsv->rc, &rsv->mas); | |
288 | uwb_rsv_put_stream(rsv); | |
289 | uwb_rsv_state_update(rsv, UWB_RSV_STATE_NONE); | |
290 | uwb_rsv_callback(rsv); | |
291 | break; | |
292 | case UWB_RSV_STATE_O_INITIATED: | |
293 | uwb_rsv_state_update(rsv, UWB_RSV_STATE_O_INITIATED); | |
294 | break; | |
295 | case UWB_RSV_STATE_O_PENDING: | |
296 | uwb_rsv_state_update(rsv, UWB_RSV_STATE_O_PENDING); | |
297 | break; | |
298 | case UWB_RSV_STATE_O_ESTABLISHED: | |
299 | uwb_drp_avail_reserve(rsv->rc, &rsv->mas); | |
300 | uwb_rsv_state_update(rsv, UWB_RSV_STATE_O_ESTABLISHED); | |
301 | uwb_rsv_callback(rsv); | |
302 | break; | |
303 | case UWB_RSV_STATE_T_ACCEPTED: | |
304 | uwb_drp_avail_reserve(rsv->rc, &rsv->mas); | |
305 | uwb_rsv_state_update(rsv, UWB_RSV_STATE_T_ACCEPTED); | |
306 | uwb_rsv_callback(rsv); | |
307 | break; | |
308 | case UWB_RSV_STATE_T_DENIED: | |
309 | uwb_rsv_state_update(rsv, UWB_RSV_STATE_T_DENIED); | |
310 | break; | |
311 | default: | |
312 | dev_err(&rsv->rc->uwb_dev.dev, "unhandled state: %s (%d)\n", | |
313 | uwb_rsv_state_str(new_state), new_state); | |
314 | } | |
315 | } | |
316 | ||
317 | static struct uwb_rsv *uwb_rsv_alloc(struct uwb_rc *rc) | |
318 | { | |
319 | struct uwb_rsv *rsv; | |
320 | ||
321 | rsv = kzalloc(sizeof(struct uwb_rsv), GFP_KERNEL); | |
322 | if (!rsv) | |
323 | return NULL; | |
324 | ||
325 | INIT_LIST_HEAD(&rsv->rc_node); | |
326 | INIT_LIST_HEAD(&rsv->pal_node); | |
327 | init_timer(&rsv->timer); | |
328 | rsv->timer.function = uwb_rsv_timer; | |
329 | rsv->timer.data = (unsigned long)rsv; | |
330 | ||
331 | rsv->rc = rc; | |
332 | ||
333 | return rsv; | |
334 | } | |
335 | ||
336 | static void uwb_rsv_free(struct uwb_rsv *rsv) | |
337 | { | |
338 | uwb_dev_put(rsv->owner); | |
339 | if (rsv->target.type == UWB_RSV_TARGET_DEV) | |
340 | uwb_dev_put(rsv->target.dev); | |
341 | kfree(rsv); | |
342 | } | |
343 | ||
344 | /** | |
345 | * uwb_rsv_create - allocate and initialize a UWB reservation structure | |
346 | * @rc: the radio controller | |
347 | * @cb: callback to use when the reservation completes or terminates | |
348 | * @pal_priv: data private to the PAL to be passed in the callback | |
349 | * | |
350 | * The callback is called when the state of the reservation changes from: | |
351 | * | |
352 | * - pending to accepted | |
353 | * - pending to denined | |
354 | * - accepted to terminated | |
355 | * - pending to terminated | |
356 | */ | |
357 | struct uwb_rsv *uwb_rsv_create(struct uwb_rc *rc, uwb_rsv_cb_f cb, void *pal_priv) | |
358 | { | |
359 | struct uwb_rsv *rsv; | |
360 | ||
361 | rsv = uwb_rsv_alloc(rc); | |
362 | if (!rsv) | |
363 | return NULL; | |
364 | ||
365 | rsv->callback = cb; | |
366 | rsv->pal_priv = pal_priv; | |
367 | ||
368 | return rsv; | |
369 | } | |
370 | EXPORT_SYMBOL_GPL(uwb_rsv_create); | |
371 | ||
372 | void uwb_rsv_remove(struct uwb_rsv *rsv) | |
373 | { | |
374 | if (rsv->state != UWB_RSV_STATE_NONE) | |
375 | uwb_rsv_set_state(rsv, UWB_RSV_STATE_NONE); | |
376 | del_timer_sync(&rsv->timer); | |
377 | list_del(&rsv->rc_node); | |
378 | uwb_rsv_free(rsv); | |
379 | } | |
380 | ||
381 | /** | |
382 | * uwb_rsv_destroy - free a UWB reservation structure | |
383 | * @rsv: the reservation to free | |
384 | * | |
385 | * The reservation will be terminated if it is pending or established. | |
386 | */ | |
387 | void uwb_rsv_destroy(struct uwb_rsv *rsv) | |
388 | { | |
389 | struct uwb_rc *rc = rsv->rc; | |
390 | ||
391 | mutex_lock(&rc->rsvs_mutex); | |
392 | uwb_rsv_remove(rsv); | |
393 | mutex_unlock(&rc->rsvs_mutex); | |
394 | } | |
395 | EXPORT_SYMBOL_GPL(uwb_rsv_destroy); | |
396 | ||
397 | /** | |
398 | * usb_rsv_establish - start a reservation establishment | |
399 | * @rsv: the reservation | |
400 | * | |
401 | * The PAL should fill in @rsv's owner, target, type, max_mas, | |
402 | * min_mas, sparsity and is_multicast fields. If the target is a | |
403 | * uwb_dev it must be referenced. | |
404 | * | |
405 | * The reservation's callback will be called when the reservation is | |
406 | * accepted, denied or times out. | |
407 | */ | |
408 | int uwb_rsv_establish(struct uwb_rsv *rsv) | |
409 | { | |
410 | struct uwb_rc *rc = rsv->rc; | |
411 | int ret; | |
412 | ||
413 | mutex_lock(&rc->rsvs_mutex); | |
414 | ||
415 | ret = uwb_rsv_get_stream(rsv); | |
416 | if (ret) | |
417 | goto out; | |
418 | ||
419 | ret = uwb_rsv_alloc_mas(rsv); | |
420 | if (ret) { | |
421 | uwb_rsv_put_stream(rsv); | |
422 | goto out; | |
423 | } | |
424 | ||
425 | list_add_tail(&rsv->rc_node, &rc->reservations); | |
426 | rsv->owner = &rc->uwb_dev; | |
427 | uwb_dev_get(rsv->owner); | |
428 | uwb_rsv_set_state(rsv, UWB_RSV_STATE_O_INITIATED); | |
429 | out: | |
430 | mutex_unlock(&rc->rsvs_mutex); | |
431 | return ret; | |
432 | } | |
433 | EXPORT_SYMBOL_GPL(uwb_rsv_establish); | |
434 | ||
435 | /** | |
436 | * uwb_rsv_modify - modify an already established reservation | |
437 | * @rsv: the reservation to modify | |
438 | * @max_mas: new maximum MAS to reserve | |
439 | * @min_mas: new minimum MAS to reserve | |
440 | * @sparsity: new sparsity to use | |
441 | * | |
442 | * FIXME: implement this once there are PALs that use it. | |
443 | */ | |
444 | int uwb_rsv_modify(struct uwb_rsv *rsv, int max_mas, int min_mas, int sparsity) | |
445 | { | |
446 | return -ENOSYS; | |
447 | } | |
448 | EXPORT_SYMBOL_GPL(uwb_rsv_modify); | |
449 | ||
450 | /** | |
451 | * uwb_rsv_terminate - terminate an established reservation | |
452 | * @rsv: the reservation to terminate | |
453 | * | |
454 | * A reservation is terminated by removing the DRP IE from the beacon, | |
455 | * the other end will consider the reservation to be terminated when | |
456 | * it does not see the DRP IE for at least mMaxLostBeacons. | |
457 | * | |
458 | * If applicable, the reference to the target uwb_dev will be released. | |
459 | */ | |
460 | void uwb_rsv_terminate(struct uwb_rsv *rsv) | |
461 | { | |
462 | struct uwb_rc *rc = rsv->rc; | |
463 | ||
464 | mutex_lock(&rc->rsvs_mutex); | |
465 | ||
466 | uwb_rsv_set_state(rsv, UWB_RSV_STATE_NONE); | |
467 | ||
468 | mutex_unlock(&rc->rsvs_mutex); | |
469 | } | |
470 | EXPORT_SYMBOL_GPL(uwb_rsv_terminate); | |
471 | ||
472 | /** | |
473 | * uwb_rsv_accept - accept a new reservation from a peer | |
474 | * @rsv: the reservation | |
475 | * @cb: call back for reservation changes | |
476 | * @pal_priv: data to be passed in the above call back | |
477 | * | |
478 | * Reservation requests from peers are denied unless a PAL accepts it | |
479 | * by calling this function. | |
480 | */ | |
481 | void uwb_rsv_accept(struct uwb_rsv *rsv, uwb_rsv_cb_f cb, void *pal_priv) | |
482 | { | |
483 | rsv->callback = cb; | |
484 | rsv->pal_priv = pal_priv; | |
485 | rsv->state = UWB_RSV_STATE_T_ACCEPTED; | |
486 | } | |
487 | EXPORT_SYMBOL_GPL(uwb_rsv_accept); | |
488 | ||
489 | /* | |
490 | * Is a received DRP IE for this reservation? | |
491 | */ | |
492 | static bool uwb_rsv_match(struct uwb_rsv *rsv, struct uwb_dev *src, | |
493 | struct uwb_ie_drp *drp_ie) | |
494 | { | |
495 | struct uwb_dev_addr *rsv_src; | |
496 | int stream; | |
497 | ||
498 | stream = uwb_ie_drp_stream_index(drp_ie); | |
499 | ||
500 | if (rsv->stream != stream) | |
501 | return false; | |
502 | ||
503 | switch (rsv->target.type) { | |
504 | case UWB_RSV_TARGET_DEVADDR: | |
505 | return rsv->stream == stream; | |
506 | case UWB_RSV_TARGET_DEV: | |
507 | if (uwb_ie_drp_owner(drp_ie)) | |
508 | rsv_src = &rsv->owner->dev_addr; | |
509 | else | |
510 | rsv_src = &rsv->target.dev->dev_addr; | |
511 | return uwb_dev_addr_cmp(&src->dev_addr, rsv_src) == 0; | |
512 | } | |
513 | return false; | |
514 | } | |
515 | ||
516 | static struct uwb_rsv *uwb_rsv_new_target(struct uwb_rc *rc, | |
517 | struct uwb_dev *src, | |
518 | struct uwb_ie_drp *drp_ie) | |
519 | { | |
520 | struct uwb_rsv *rsv; | |
521 | struct uwb_pal *pal; | |
522 | enum uwb_rsv_state state; | |
523 | ||
524 | rsv = uwb_rsv_alloc(rc); | |
525 | if (!rsv) | |
526 | return NULL; | |
527 | ||
528 | rsv->rc = rc; | |
529 | rsv->owner = src; | |
530 | uwb_dev_get(rsv->owner); | |
531 | rsv->target.type = UWB_RSV_TARGET_DEV; | |
532 | rsv->target.dev = &rc->uwb_dev; | |
533 | rsv->type = uwb_ie_drp_type(drp_ie); | |
534 | rsv->stream = uwb_ie_drp_stream_index(drp_ie); | |
535 | set_bit(rsv->stream, rsv->owner->streams); | |
536 | uwb_drp_ie_to_bm(&rsv->mas, drp_ie); | |
537 | ||
538 | /* | |
539 | * See if any PALs are interested in this reservation. If not, | |
540 | * deny the request. | |
541 | */ | |
542 | rsv->state = UWB_RSV_STATE_T_DENIED; | |
543 | spin_lock(&rc->pal_lock); | |
544 | list_for_each_entry(pal, &rc->pals, node) { | |
545 | if (pal->new_rsv) | |
546 | pal->new_rsv(rsv); | |
547 | if (rsv->state == UWB_RSV_STATE_T_ACCEPTED) | |
548 | break; | |
549 | } | |
550 | spin_unlock(&rc->pal_lock); | |
551 | ||
552 | list_add_tail(&rsv->rc_node, &rc->reservations); | |
553 | state = rsv->state; | |
554 | rsv->state = UWB_RSV_STATE_NONE; | |
555 | uwb_rsv_set_state(rsv, state); | |
556 | ||
557 | return rsv; | |
558 | } | |
559 | ||
560 | /** | |
561 | * uwb_rsv_find - find a reservation for a received DRP IE. | |
562 | * @rc: the radio controller | |
563 | * @src: source of the DRP IE | |
564 | * @drp_ie: the DRP IE | |
565 | * | |
566 | * If the reservation cannot be found and the DRP IE is from a peer | |
567 | * attempting to establish a new reservation, create a new reservation | |
568 | * and add it to the list. | |
569 | */ | |
570 | struct uwb_rsv *uwb_rsv_find(struct uwb_rc *rc, struct uwb_dev *src, | |
571 | struct uwb_ie_drp *drp_ie) | |
572 | { | |
573 | struct uwb_rsv *rsv; | |
574 | ||
575 | list_for_each_entry(rsv, &rc->reservations, rc_node) { | |
576 | if (uwb_rsv_match(rsv, src, drp_ie)) | |
577 | return rsv; | |
578 | } | |
579 | ||
580 | if (uwb_ie_drp_owner(drp_ie)) | |
581 | return uwb_rsv_new_target(rc, src, drp_ie); | |
582 | ||
583 | return NULL; | |
584 | } | |
585 | ||
586 | /* | |
587 | * Go through all the reservations and check for timeouts and (if | |
588 | * necessary) update their DRP IEs. | |
589 | * | |
590 | * FIXME: look at building the SET_DRP_IE command here rather than | |
591 | * having to rescan the list in uwb_rc_send_all_drp_ie(). | |
592 | */ | |
593 | static bool uwb_rsv_update_all(struct uwb_rc *rc) | |
594 | { | |
595 | struct uwb_rsv *rsv, *t; | |
596 | bool ie_updated = false; | |
597 | ||
598 | list_for_each_entry_safe(rsv, t, &rc->reservations, rc_node) { | |
599 | if (rsv->expired) | |
600 | uwb_drp_handle_timeout(rsv); | |
601 | if (!rsv->ie_valid) { | |
602 | uwb_drp_ie_update(rsv); | |
603 | ie_updated = true; | |
604 | } | |
605 | } | |
606 | ||
607 | return ie_updated; | |
608 | } | |
609 | ||
610 | void uwb_rsv_sched_update(struct uwb_rc *rc) | |
611 | { | |
612 | queue_work(rc->rsv_workq, &rc->rsv_update_work); | |
613 | } | |
614 | ||
615 | /* | |
616 | * Update DRP IEs and, if necessary, the DRP Availability IE and send | |
617 | * the updated IEs to the radio controller. | |
618 | */ | |
619 | static void uwb_rsv_update_work(struct work_struct *work) | |
620 | { | |
621 | struct uwb_rc *rc = container_of(work, struct uwb_rc, rsv_update_work); | |
622 | bool ie_updated; | |
623 | ||
624 | mutex_lock(&rc->rsvs_mutex); | |
625 | ||
626 | ie_updated = uwb_rsv_update_all(rc); | |
627 | ||
628 | if (!rc->drp_avail.ie_valid) { | |
629 | uwb_drp_avail_ie_update(rc); | |
630 | ie_updated = true; | |
631 | } | |
632 | ||
633 | if (ie_updated) | |
634 | uwb_rc_send_all_drp_ie(rc); | |
635 | ||
636 | mutex_unlock(&rc->rsvs_mutex); | |
637 | } | |
638 | ||
639 | static void uwb_rsv_timer(unsigned long arg) | |
640 | { | |
641 | struct uwb_rsv *rsv = (struct uwb_rsv *)arg; | |
642 | ||
643 | rsv->expired = true; | |
644 | uwb_rsv_sched_update(rsv->rc); | |
645 | } | |
646 | ||
647 | void uwb_rsv_init(struct uwb_rc *rc) | |
648 | { | |
649 | INIT_LIST_HEAD(&rc->reservations); | |
650 | mutex_init(&rc->rsvs_mutex); | |
651 | INIT_WORK(&rc->rsv_update_work, uwb_rsv_update_work); | |
652 | ||
653 | bitmap_complement(rc->uwb_dev.streams, rc->uwb_dev.streams, UWB_NUM_STREAMS); | |
654 | } | |
655 | ||
656 | int uwb_rsv_setup(struct uwb_rc *rc) | |
657 | { | |
658 | char name[16]; | |
659 | ||
660 | snprintf(name, sizeof(name), "%s_rsvd", dev_name(&rc->uwb_dev.dev)); | |
661 | rc->rsv_workq = create_singlethread_workqueue(name); | |
662 | if (rc->rsv_workq == NULL) | |
663 | return -ENOMEM; | |
664 | ||
665 | return 0; | |
666 | } | |
667 | ||
668 | void uwb_rsv_cleanup(struct uwb_rc *rc) | |
669 | { | |
670 | struct uwb_rsv *rsv, *t; | |
671 | ||
672 | mutex_lock(&rc->rsvs_mutex); | |
673 | list_for_each_entry_safe(rsv, t, &rc->reservations, rc_node) { | |
674 | uwb_rsv_remove(rsv); | |
675 | } | |
676 | mutex_unlock(&rc->rsvs_mutex); | |
677 | ||
678 | cancel_work_sync(&rc->rsv_update_work); | |
679 | destroy_workqueue(rc->rsv_workq); | |
680 | } |