Commit | Line | Data |
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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 | */ | |
8cc13a09 DV |
18 | #include <linux/kernel.h> |
19 | #include <linux/uwb.h> | |
5a0e3ad6 | 20 | #include <linux/slab.h> |
5b37717a | 21 | #include <linux/random.h> |
8cc13a09 DV |
22 | |
23 | #include "uwb-internal.h" | |
24 | ||
25 | static void uwb_rsv_timer(unsigned long arg); | |
26 | ||
27 | static const char *rsv_states[] = { | |
5b37717a SP |
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 ", | |
8cc13a09 DV |
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 | ||
5b37717a SP |
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 | ||
8cc13a09 DV |
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 | ||
5b37717a | 105 | void uwb_rsv_dump(char *text, struct uwb_rsv *rsv) |
8cc13a09 DV |
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 | ||
2226b1c2 DV |
118 | dev_dbg(dev, "rsv %s %s -> %s: %s\n", |
119 | text, owner, target, uwb_rsv_state_str(rsv->state)); | |
8cc13a09 DV |
120 | } |
121 | ||
cae1c114 DV |
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 | ||
5b37717a | 129 | void uwb_rsv_get(struct uwb_rsv *rsv) |
cae1c114 DV |
130 | { |
131 | kref_get(&rsv->kref); | |
132 | } | |
133 | ||
5b37717a | 134 | void uwb_rsv_put(struct uwb_rsv *rsv) |
cae1c114 DV |
135 | { |
136 | kref_put(&rsv->kref, uwb_rsv_release); | |
137 | } | |
138 | ||
8cc13a09 DV |
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; | |
5b37717a | 149 | struct device *dev = &rc->uwb_dev.dev; |
8cc13a09 DV |
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 | ||
5b37717a SP |
171 | dev_dbg(dev, "get stream %d\n", rsv->stream); |
172 | ||
8cc13a09 DV |
173 | return 0; |
174 | } | |
175 | ||
176 | static void uwb_rsv_put_stream(struct uwb_rsv *rsv) | |
177 | { | |
178 | struct uwb_rc *rc = rsv->rc; | |
5b37717a | 179 | struct device *dev = &rc->uwb_dev.dev; |
8cc13a09 DV |
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); | |
5b37717a SP |
194 | |
195 | dev_dbg(dev, "put stream %d\n", rsv->stream); | |
8cc13a09 DV |
196 | } |
197 | ||
5b37717a | 198 | void uwb_rsv_backoff_win_timer(unsigned long arg) |
8cc13a09 | 199 | { |
5b37717a SP |
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; | |
8cc13a09 | 203 | |
5b37717a SP |
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; | |
8cc13a09 | 212 | } |
5b37717a SP |
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); | |
8cc13a09 DV |
217 | } |
218 | ||
5b37717a | 219 | void uwb_rsv_backoff_win_increment(struct uwb_rc *rc) |
8cc13a09 | 220 | { |
5b37717a SP |
221 | struct uwb_drp_backoff_win *bow = &rc->bow; |
222 | struct device *dev = &rc->uwb_dev.dev; | |
223 | unsigned timeout_us; | |
8cc13a09 | 224 | |
5b37717a | 225 | dev_dbg(dev, "backoff_win_increment: window=%d\n", bow->window); |
8cc13a09 | 226 | |
5b37717a | 227 | bow->can_reserve_extra_mases = false; |
8cc13a09 | 228 | |
5b37717a SP |
229 | if((bow->window << 1) == UWB_DRP_BACKOFF_WIN_MAX) |
230 | return; | |
8cc13a09 | 231 | |
5b37717a SP |
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); | |
8cc13a09 | 235 | |
5b37717a SP |
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)); | |
8cc13a09 DV |
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) { | |
5b37717a SP |
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) | |
8cc13a09 DV |
256 | sframes = 1; |
257 | if (rsv->state == UWB_RSV_STATE_O_ESTABLISHED) | |
258 | sframes = 0; | |
5b37717a | 259 | |
8cc13a09 DV |
260 | } |
261 | ||
8cc13a09 DV |
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 | ||
5b37717a | 283 | uwb_rsv_dump("SU", rsv); |
8cc13a09 DV |
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 | { | |
5b37717a SP |
297 | struct uwb_rsv_move *mv = &rsv->mv; |
298 | ||
8cc13a09 DV |
299 | if (rsv->state == new_state) { |
300 | switch (rsv->state) { | |
301 | case UWB_RSV_STATE_O_ESTABLISHED: | |
5b37717a SP |
302 | case UWB_RSV_STATE_O_MOVE_EXPANDING: |
303 | case UWB_RSV_STATE_O_MOVE_COMBINING: | |
304 | case UWB_RSV_STATE_O_MOVE_REDUCING: | |
8cc13a09 | 305 | case UWB_RSV_STATE_T_ACCEPTED: |
5b37717a SP |
306 | case UWB_RSV_STATE_T_EXPANDING_ACCEPTED: |
307 | case UWB_RSV_STATE_T_RESIZED: | |
8cc13a09 DV |
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 | ||
5b37717a SP |
319 | uwb_rsv_dump("SC", rsv); |
320 | ||
8cc13a09 DV |
321 | switch (new_state) { |
322 | case UWB_RSV_STATE_NONE: | |
8cc13a09 DV |
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; | |
5b37717a SP |
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; | |
8cc13a09 | 337 | case UWB_RSV_STATE_O_ESTABLISHED: |
5b37717a SP |
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 | } | |
8cc13a09 DV |
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; | |
5b37717a SP |
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; | |
8cc13a09 | 368 | case UWB_RSV_STATE_T_ACCEPTED: |
5b37717a SP |
369 | case UWB_RSV_STATE_T_RESIZED: |
370 | rsv->needs_release_companion_mas = false; | |
8cc13a09 DV |
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; | |
5b37717a SP |
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; | |
8cc13a09 DV |
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 | ||
5b37717a SP |
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 | ||
8cc13a09 DV |
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); | |
cae1c114 | 464 | kref_init(&rsv->kref); |
8cc13a09 DV |
465 | init_timer(&rsv->timer); |
466 | rsv->timer.function = uwb_rsv_timer; | |
467 | rsv->timer.data = (unsigned long)rsv; | |
468 | ||
469 | rsv->rc = rc; | |
5b37717a | 470 | INIT_WORK(&rsv->handle_timeout_work, uwb_rsv_handle_timeout_work); |
8cc13a09 DV |
471 | |
472 | return rsv; | |
473 | } | |
474 | ||
8cc13a09 DV |
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 | { | |
5b37717a SP |
505 | uwb_rsv_dump("RM", rsv); |
506 | ||
8cc13a09 DV |
507 | if (rsv->state != UWB_RSV_STATE_NONE) |
508 | uwb_rsv_set_state(rsv, UWB_RSV_STATE_NONE); | |
5b37717a SP |
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); | |
2226b1c2 | 516 | |
cae1c114 DV |
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); | |
8cc13a09 DV |
523 | } |
524 | ||
525 | /** | |
526 | * uwb_rsv_destroy - free a UWB reservation structure | |
527 | * @rsv: the reservation to free | |
528 | * | |
cae1c114 | 529 | * The reservation must already be terminated. |
8cc13a09 DV |
530 | */ |
531 | void uwb_rsv_destroy(struct uwb_rsv *rsv) | |
532 | { | |
cae1c114 | 533 | uwb_rsv_put(rsv); |
8cc13a09 DV |
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, | |
5b37717a | 542 | * min_mas, max_interval and is_multicast fields. If the target is a |
8cc13a09 DV |
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; | |
5b37717a | 551 | struct uwb_mas_bm available; |
8cc13a09 DV |
552 | int ret; |
553 | ||
554 | mutex_lock(&rc->rsvs_mutex); | |
8cc13a09 DV |
555 | ret = uwb_rsv_get_stream(rsv); |
556 | if (ret) | |
557 | goto out; | |
558 | ||
5b37717a SP |
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) { | |
8cc13a09 DV |
572 | uwb_rsv_put_stream(rsv); |
573 | goto out; | |
574 | } | |
575 | ||
cae1c114 | 576 | uwb_rsv_get(rsv); |
8cc13a09 DV |
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 | |
5b37717a | 592 | * @max_interval: new max_interval to use |
8cc13a09 DV |
593 | * |
594 | * FIXME: implement this once there are PALs that use it. | |
595 | */ | |
5b37717a | 596 | int uwb_rsv_modify(struct uwb_rsv *rsv, int max_mas, int min_mas, int max_interval) |
8cc13a09 DV |
597 | { |
598 | return -ENOSYS; | |
599 | } | |
600 | EXPORT_SYMBOL_GPL(uwb_rsv_modify); | |
601 | ||
5b37717a SP |
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 | ||
8cc13a09 DV |
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 | ||
671e470e DV |
673 | if (rsv->state != UWB_RSV_STATE_NONE) |
674 | uwb_rsv_set_state(rsv, UWB_RSV_STATE_NONE); | |
8cc13a09 DV |
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. | |
cae1c114 DV |
688 | * |
689 | * The PAL call uwb_rsv_destroy() for all accepted reservations before | |
690 | * calling uwb_pal_unregister(). | |
8cc13a09 DV |
691 | */ |
692 | void uwb_rsv_accept(struct uwb_rsv *rsv, uwb_rsv_cb_f cb, void *pal_priv) | |
693 | { | |
cae1c114 DV |
694 | uwb_rsv_get(rsv); |
695 | ||
8cc13a09 DV |
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; | |
5b37717a | 746 | uwb_dev_get(&rc->uwb_dev); |
8cc13a09 DV |
747 | rsv->type = uwb_ie_drp_type(drp_ie); |
748 | rsv->stream = uwb_ie_drp_stream_index(drp_ie); | |
8cc13a09 DV |
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; | |
6fae35f9 | 756 | mutex_lock(&rc->uwb_dev.mutex); |
8cc13a09 DV |
757 | list_for_each_entry(pal, &rc->pals, node) { |
758 | if (pal->new_rsv) | |
e17be2b2 | 759 | pal->new_rsv(pal, rsv); |
8cc13a09 DV |
760 | if (rsv->state == UWB_RSV_STATE_T_ACCEPTED) |
761 | break; | |
762 | } | |
6fae35f9 | 763 | mutex_unlock(&rc->uwb_dev.mutex); |
8cc13a09 DV |
764 | |
765 | list_add_tail(&rsv->rc_node, &rc->reservations); | |
766 | state = rsv->state; | |
767 | rsv->state = UWB_RSV_STATE_NONE; | |
5b37717a SP |
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 | } | |
8cc13a09 DV |
776 | |
777 | return rsv; | |
778 | } | |
779 | ||
5b37717a SP |
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 | ||
8cc13a09 DV |
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) { | |
8cc13a09 DV |
834 | if (!rsv->ie_valid) { |
835 | uwb_drp_ie_update(rsv); | |
836 | ie_updated = true; | |
837 | } | |
838 | } | |
839 | ||
840 | return ie_updated; | |
841 | } | |
842 | ||
5b37717a SP |
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 | */ | |
8cc13a09 DV |
872 | void uwb_rsv_sched_update(struct uwb_rc *rc) |
873 | { | |
8f5140a6 | 874 | spin_lock_bh(&rc->rsvs_lock); |
5b37717a SP |
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: | |
8f5140a6 | 883 | spin_unlock_bh(&rc->rsvs_lock); |
8cc13a09 DV |
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 | { | |
5b37717a SP |
892 | struct uwb_rc *rc = container_of(work, struct uwb_rc, |
893 | rsv_update_work.work); | |
8cc13a09 DV |
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 | ||
5b37717a | 905 | if (ie_updated && (rc->set_drp_ie_pending == 0)) |
8cc13a09 DV |
906 | uwb_rc_send_all_drp_ie(rc); |
907 | ||
908 | mutex_unlock(&rc->rsvs_mutex); | |
909 | } | |
910 | ||
5b37717a SP |
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 | ||
8cc13a09 DV |
928 | static void uwb_rsv_timer(unsigned long arg) |
929 | { | |
930 | struct uwb_rsv *rsv = (struct uwb_rsv *)arg; | |
931 | ||
5b37717a | 932 | queue_work(rsv->rc->rsv_workq, &rsv->handle_timeout_work); |
8cc13a09 DV |
933 | } |
934 | ||
307ba6dd DV |
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) { | |
2226b1c2 DV |
947 | if (rsv->state != UWB_RSV_STATE_NONE) |
948 | uwb_rsv_set_state(rsv, UWB_RSV_STATE_NONE); | |
949 | del_timer_sync(&rsv->timer); | |
307ba6dd | 950 | } |
5b37717a SP |
951 | /* Cancel any postponed update. */ |
952 | rc->set_drp_ie_pending = 0; | |
307ba6dd DV |
953 | mutex_unlock(&rc->rsvs_mutex); |
954 | ||
5b37717a | 955 | cancel_delayed_work_sync(&rc->rsv_update_work); |
2226b1c2 DV |
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); | |
307ba6dd DV |
963 | } |
964 | ||
8cc13a09 DV |
965 | void uwb_rsv_init(struct uwb_rc *rc) |
966 | { | |
967 | INIT_LIST_HEAD(&rc->reservations); | |
5b37717a | 968 | INIT_LIST_HEAD(&rc->cnflt_alien_list); |
8cc13a09 | 969 | mutex_init(&rc->rsvs_mutex); |
5b37717a SP |
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; | |
8cc13a09 DV |
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 | { | |
307ba6dd | 997 | uwb_rsv_remove_all(rc); |
8cc13a09 DV |
998 | destroy_workqueue(rc->rsv_workq); |
999 | } |