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> | |
5b37717a | 20 | #include <linux/random.h> |
8cc13a09 DV |
21 | |
22 | #include "uwb-internal.h" | |
23 | ||
24 | static void uwb_rsv_timer(unsigned long arg); | |
25 | ||
26 | static const char *rsv_states[] = { | |
5b37717a SP |
27 | [UWB_RSV_STATE_NONE] = "none ", |
28 | [UWB_RSV_STATE_O_INITIATED] = "o initiated ", | |
29 | [UWB_RSV_STATE_O_PENDING] = "o pending ", | |
30 | [UWB_RSV_STATE_O_MODIFIED] = "o modified ", | |
31 | [UWB_RSV_STATE_O_ESTABLISHED] = "o established ", | |
32 | [UWB_RSV_STATE_O_TO_BE_MOVED] = "o to be moved ", | |
33 | [UWB_RSV_STATE_O_MOVE_EXPANDING] = "o move expanding", | |
34 | [UWB_RSV_STATE_O_MOVE_COMBINING] = "o move combining", | |
35 | [UWB_RSV_STATE_O_MOVE_REDUCING] = "o move reducing ", | |
36 | [UWB_RSV_STATE_T_ACCEPTED] = "t accepted ", | |
37 | [UWB_RSV_STATE_T_CONFLICT] = "t conflict ", | |
38 | [UWB_RSV_STATE_T_PENDING] = "t pending ", | |
39 | [UWB_RSV_STATE_T_DENIED] = "t denied ", | |
40 | [UWB_RSV_STATE_T_RESIZED] = "t resized ", | |
41 | [UWB_RSV_STATE_T_EXPANDING_ACCEPTED] = "t expanding acc ", | |
42 | [UWB_RSV_STATE_T_EXPANDING_CONFLICT] = "t expanding conf", | |
43 | [UWB_RSV_STATE_T_EXPANDING_PENDING] = "t expanding pend", | |
44 | [UWB_RSV_STATE_T_EXPANDING_DENIED] = "t expanding den ", | |
8cc13a09 DV |
45 | }; |
46 | ||
47 | static const char *rsv_types[] = { | |
48 | [UWB_DRP_TYPE_ALIEN_BP] = "alien-bp", | |
49 | [UWB_DRP_TYPE_HARD] = "hard", | |
50 | [UWB_DRP_TYPE_SOFT] = "soft", | |
51 | [UWB_DRP_TYPE_PRIVATE] = "private", | |
52 | [UWB_DRP_TYPE_PCA] = "pca", | |
53 | }; | |
54 | ||
5b37717a SP |
55 | bool uwb_rsv_has_two_drp_ies(struct uwb_rsv *rsv) |
56 | { | |
57 | static const bool has_two_drp_ies[] = { | |
58 | [UWB_RSV_STATE_O_INITIATED] = false, | |
59 | [UWB_RSV_STATE_O_PENDING] = false, | |
60 | [UWB_RSV_STATE_O_MODIFIED] = false, | |
61 | [UWB_RSV_STATE_O_ESTABLISHED] = false, | |
62 | [UWB_RSV_STATE_O_TO_BE_MOVED] = false, | |
63 | [UWB_RSV_STATE_O_MOVE_COMBINING] = false, | |
64 | [UWB_RSV_STATE_O_MOVE_REDUCING] = false, | |
65 | [UWB_RSV_STATE_O_MOVE_EXPANDING] = true, | |
66 | [UWB_RSV_STATE_T_ACCEPTED] = false, | |
67 | [UWB_RSV_STATE_T_CONFLICT] = false, | |
68 | [UWB_RSV_STATE_T_PENDING] = false, | |
69 | [UWB_RSV_STATE_T_DENIED] = false, | |
70 | [UWB_RSV_STATE_T_RESIZED] = false, | |
71 | [UWB_RSV_STATE_T_EXPANDING_ACCEPTED] = true, | |
72 | [UWB_RSV_STATE_T_EXPANDING_CONFLICT] = true, | |
73 | [UWB_RSV_STATE_T_EXPANDING_PENDING] = true, | |
74 | [UWB_RSV_STATE_T_EXPANDING_DENIED] = true, | |
75 | }; | |
76 | ||
77 | return has_two_drp_ies[rsv->state]; | |
78 | } | |
79 | ||
8cc13a09 DV |
80 | /** |
81 | * uwb_rsv_state_str - return a string for a reservation state | |
82 | * @state: the reservation state. | |
83 | */ | |
84 | const char *uwb_rsv_state_str(enum uwb_rsv_state state) | |
85 | { | |
86 | if (state < UWB_RSV_STATE_NONE || state >= UWB_RSV_STATE_LAST) | |
87 | return "unknown"; | |
88 | return rsv_states[state]; | |
89 | } | |
90 | EXPORT_SYMBOL_GPL(uwb_rsv_state_str); | |
91 | ||
92 | /** | |
93 | * uwb_rsv_type_str - return a string for a reservation type | |
94 | * @type: the reservation type | |
95 | */ | |
96 | const char *uwb_rsv_type_str(enum uwb_drp_type type) | |
97 | { | |
98 | if (type < UWB_DRP_TYPE_ALIEN_BP || type > UWB_DRP_TYPE_PCA) | |
99 | return "invalid"; | |
100 | return rsv_types[type]; | |
101 | } | |
102 | EXPORT_SYMBOL_GPL(uwb_rsv_type_str); | |
103 | ||
5b37717a | 104 | void uwb_rsv_dump(char *text, struct uwb_rsv *rsv) |
8cc13a09 DV |
105 | { |
106 | struct device *dev = &rsv->rc->uwb_dev.dev; | |
107 | struct uwb_dev_addr devaddr; | |
108 | char owner[UWB_ADDR_STRSIZE], target[UWB_ADDR_STRSIZE]; | |
109 | ||
110 | uwb_dev_addr_print(owner, sizeof(owner), &rsv->owner->dev_addr); | |
111 | if (rsv->target.type == UWB_RSV_TARGET_DEV) | |
112 | devaddr = rsv->target.dev->dev_addr; | |
113 | else | |
114 | devaddr = rsv->target.devaddr; | |
115 | uwb_dev_addr_print(target, sizeof(target), &devaddr); | |
116 | ||
117 | dev_dbg(dev, "rsv %s -> %s: %s\n", owner, target, uwb_rsv_state_str(rsv->state)); | |
118 | } | |
119 | ||
cae1c114 DV |
120 | static void uwb_rsv_release(struct kref *kref) |
121 | { | |
122 | struct uwb_rsv *rsv = container_of(kref, struct uwb_rsv, kref); | |
123 | ||
124 | kfree(rsv); | |
125 | } | |
126 | ||
5b37717a | 127 | void uwb_rsv_get(struct uwb_rsv *rsv) |
cae1c114 DV |
128 | { |
129 | kref_get(&rsv->kref); | |
130 | } | |
131 | ||
5b37717a | 132 | void uwb_rsv_put(struct uwb_rsv *rsv) |
cae1c114 DV |
133 | { |
134 | kref_put(&rsv->kref, uwb_rsv_release); | |
135 | } | |
136 | ||
8cc13a09 DV |
137 | /* |
138 | * Get a free stream index for a reservation. | |
139 | * | |
140 | * If the target is a DevAddr (e.g., a WUSB cluster reservation) then | |
141 | * the stream is allocated from a pool of per-RC stream indexes, | |
142 | * otherwise a unique stream index for the target is selected. | |
143 | */ | |
144 | static int uwb_rsv_get_stream(struct uwb_rsv *rsv) | |
145 | { | |
146 | struct uwb_rc *rc = rsv->rc; | |
5b37717a | 147 | struct device *dev = &rc->uwb_dev.dev; |
8cc13a09 DV |
148 | unsigned long *streams_bm; |
149 | int stream; | |
150 | ||
151 | switch (rsv->target.type) { | |
152 | case UWB_RSV_TARGET_DEV: | |
153 | streams_bm = rsv->target.dev->streams; | |
154 | break; | |
155 | case UWB_RSV_TARGET_DEVADDR: | |
156 | streams_bm = rc->uwb_dev.streams; | |
157 | break; | |
158 | default: | |
159 | return -EINVAL; | |
160 | } | |
161 | ||
162 | stream = find_first_zero_bit(streams_bm, UWB_NUM_STREAMS); | |
163 | if (stream >= UWB_NUM_STREAMS) | |
164 | return -EBUSY; | |
165 | ||
166 | rsv->stream = stream; | |
167 | set_bit(stream, streams_bm); | |
168 | ||
5b37717a SP |
169 | dev_dbg(dev, "get stream %d\n", rsv->stream); |
170 | ||
8cc13a09 DV |
171 | return 0; |
172 | } | |
173 | ||
174 | static void uwb_rsv_put_stream(struct uwb_rsv *rsv) | |
175 | { | |
176 | struct uwb_rc *rc = rsv->rc; | |
5b37717a | 177 | struct device *dev = &rc->uwb_dev.dev; |
8cc13a09 DV |
178 | unsigned long *streams_bm; |
179 | ||
180 | switch (rsv->target.type) { | |
181 | case UWB_RSV_TARGET_DEV: | |
182 | streams_bm = rsv->target.dev->streams; | |
183 | break; | |
184 | case UWB_RSV_TARGET_DEVADDR: | |
185 | streams_bm = rc->uwb_dev.streams; | |
186 | break; | |
187 | default: | |
188 | return; | |
189 | } | |
190 | ||
191 | clear_bit(rsv->stream, streams_bm); | |
5b37717a SP |
192 | |
193 | dev_dbg(dev, "put stream %d\n", rsv->stream); | |
8cc13a09 DV |
194 | } |
195 | ||
5b37717a | 196 | void uwb_rsv_backoff_win_timer(unsigned long arg) |
8cc13a09 | 197 | { |
5b37717a SP |
198 | struct uwb_drp_backoff_win *bow = (struct uwb_drp_backoff_win *)arg; |
199 | struct uwb_rc *rc = container_of(bow, struct uwb_rc, bow); | |
200 | struct device *dev = &rc->uwb_dev.dev; | |
8cc13a09 | 201 | |
5b37717a SP |
202 | bow->can_reserve_extra_mases = true; |
203 | if (bow->total_expired <= 4) { | |
204 | bow->total_expired++; | |
205 | } else { | |
206 | /* after 4 backoff window has expired we can exit from | |
207 | * the backoff procedure */ | |
208 | bow->total_expired = 0; | |
209 | bow->window = UWB_DRP_BACKOFF_WIN_MIN >> 1; | |
8cc13a09 | 210 | } |
5b37717a SP |
211 | dev_dbg(dev, "backoff_win_timer total_expired=%d, n=%d\n: ", bow->total_expired, bow->n); |
212 | ||
213 | /* try to relocate all the "to be moved" relocations */ | |
214 | uwb_rsv_handle_drp_avail_change(rc); | |
8cc13a09 DV |
215 | } |
216 | ||
5b37717a | 217 | void uwb_rsv_backoff_win_increment(struct uwb_rc *rc) |
8cc13a09 | 218 | { |
5b37717a SP |
219 | struct uwb_drp_backoff_win *bow = &rc->bow; |
220 | struct device *dev = &rc->uwb_dev.dev; | |
221 | unsigned timeout_us; | |
8cc13a09 | 222 | |
5b37717a | 223 | dev_dbg(dev, "backoff_win_increment: window=%d\n", bow->window); |
8cc13a09 | 224 | |
5b37717a | 225 | bow->can_reserve_extra_mases = false; |
8cc13a09 | 226 | |
5b37717a SP |
227 | if((bow->window << 1) == UWB_DRP_BACKOFF_WIN_MAX) |
228 | return; | |
8cc13a09 | 229 | |
5b37717a SP |
230 | bow->window <<= 1; |
231 | bow->n = random32() & (bow->window - 1); | |
232 | dev_dbg(dev, "new_window=%d, n=%d\n: ", bow->window, bow->n); | |
8cc13a09 | 233 | |
5b37717a SP |
234 | /* reset the timer associated variables */ |
235 | timeout_us = bow->n * UWB_SUPERFRAME_LENGTH_US; | |
236 | bow->total_expired = 0; | |
237 | mod_timer(&bow->timer, jiffies + usecs_to_jiffies(timeout_us)); | |
8cc13a09 DV |
238 | } |
239 | ||
240 | static void uwb_rsv_stroke_timer(struct uwb_rsv *rsv) | |
241 | { | |
242 | int sframes = UWB_MAX_LOST_BEACONS; | |
243 | ||
244 | /* | |
245 | * Multicast reservations can become established within 1 | |
246 | * super frame and should not be terminated if no response is | |
247 | * received. | |
248 | */ | |
249 | if (rsv->is_multicast) { | |
5b37717a SP |
250 | if (rsv->state == UWB_RSV_STATE_O_INITIATED |
251 | || rsv->state == UWB_RSV_STATE_O_MOVE_EXPANDING | |
252 | || rsv->state == UWB_RSV_STATE_O_MOVE_COMBINING | |
253 | || rsv->state == UWB_RSV_STATE_O_MOVE_REDUCING) | |
8cc13a09 DV |
254 | sframes = 1; |
255 | if (rsv->state == UWB_RSV_STATE_O_ESTABLISHED) | |
256 | sframes = 0; | |
5b37717a | 257 | |
8cc13a09 DV |
258 | } |
259 | ||
8cc13a09 DV |
260 | if (sframes > 0) { |
261 | /* | |
262 | * Add an additional 2 superframes to account for the | |
263 | * time to send the SET DRP IE command. | |
264 | */ | |
265 | unsigned timeout_us = (sframes + 2) * UWB_SUPERFRAME_LENGTH_US; | |
266 | mod_timer(&rsv->timer, jiffies + usecs_to_jiffies(timeout_us)); | |
267 | } else | |
268 | del_timer(&rsv->timer); | |
269 | } | |
270 | ||
271 | /* | |
272 | * Update a reservations state, and schedule an update of the | |
273 | * transmitted DRP IEs. | |
274 | */ | |
275 | static void uwb_rsv_state_update(struct uwb_rsv *rsv, | |
276 | enum uwb_rsv_state new_state) | |
277 | { | |
278 | rsv->state = new_state; | |
279 | rsv->ie_valid = false; | |
280 | ||
5b37717a | 281 | uwb_rsv_dump("SU", rsv); |
8cc13a09 DV |
282 | |
283 | uwb_rsv_stroke_timer(rsv); | |
284 | uwb_rsv_sched_update(rsv->rc); | |
285 | } | |
286 | ||
287 | static void uwb_rsv_callback(struct uwb_rsv *rsv) | |
288 | { | |
289 | if (rsv->callback) | |
290 | rsv->callback(rsv); | |
291 | } | |
292 | ||
293 | void uwb_rsv_set_state(struct uwb_rsv *rsv, enum uwb_rsv_state new_state) | |
294 | { | |
5b37717a SP |
295 | struct uwb_rsv_move *mv = &rsv->mv; |
296 | ||
8cc13a09 DV |
297 | if (rsv->state == new_state) { |
298 | switch (rsv->state) { | |
299 | case UWB_RSV_STATE_O_ESTABLISHED: | |
5b37717a SP |
300 | case UWB_RSV_STATE_O_MOVE_EXPANDING: |
301 | case UWB_RSV_STATE_O_MOVE_COMBINING: | |
302 | case UWB_RSV_STATE_O_MOVE_REDUCING: | |
8cc13a09 | 303 | case UWB_RSV_STATE_T_ACCEPTED: |
5b37717a SP |
304 | case UWB_RSV_STATE_T_EXPANDING_ACCEPTED: |
305 | case UWB_RSV_STATE_T_RESIZED: | |
8cc13a09 DV |
306 | case UWB_RSV_STATE_NONE: |
307 | uwb_rsv_stroke_timer(rsv); | |
308 | break; | |
309 | default: | |
310 | /* Expecting a state transition so leave timer | |
311 | as-is. */ | |
312 | break; | |
313 | } | |
314 | return; | |
315 | } | |
316 | ||
5b37717a SP |
317 | uwb_rsv_dump("SC", rsv); |
318 | ||
8cc13a09 DV |
319 | switch (new_state) { |
320 | case UWB_RSV_STATE_NONE: | |
8cc13a09 DV |
321 | uwb_rsv_state_update(rsv, UWB_RSV_STATE_NONE); |
322 | uwb_rsv_callback(rsv); | |
323 | break; | |
324 | case UWB_RSV_STATE_O_INITIATED: | |
325 | uwb_rsv_state_update(rsv, UWB_RSV_STATE_O_INITIATED); | |
326 | break; | |
327 | case UWB_RSV_STATE_O_PENDING: | |
328 | uwb_rsv_state_update(rsv, UWB_RSV_STATE_O_PENDING); | |
329 | break; | |
5b37717a SP |
330 | case UWB_RSV_STATE_O_MODIFIED: |
331 | /* in the companion there are the MASes to drop */ | |
332 | bitmap_andnot(rsv->mas.bm, rsv->mas.bm, mv->companion_mas.bm, UWB_NUM_MAS); | |
333 | uwb_rsv_state_update(rsv, UWB_RSV_STATE_O_MODIFIED); | |
334 | break; | |
8cc13a09 | 335 | case UWB_RSV_STATE_O_ESTABLISHED: |
5b37717a SP |
336 | if (rsv->state == UWB_RSV_STATE_O_MODIFIED |
337 | || rsv->state == UWB_RSV_STATE_O_MOVE_REDUCING) { | |
338 | uwb_drp_avail_release(rsv->rc, &mv->companion_mas); | |
339 | rsv->needs_release_companion_mas = false; | |
340 | } | |
8cc13a09 DV |
341 | uwb_drp_avail_reserve(rsv->rc, &rsv->mas); |
342 | uwb_rsv_state_update(rsv, UWB_RSV_STATE_O_ESTABLISHED); | |
343 | uwb_rsv_callback(rsv); | |
344 | break; | |
5b37717a SP |
345 | case UWB_RSV_STATE_O_MOVE_EXPANDING: |
346 | rsv->needs_release_companion_mas = true; | |
347 | uwb_rsv_state_update(rsv, UWB_RSV_STATE_O_MOVE_EXPANDING); | |
348 | break; | |
349 | case UWB_RSV_STATE_O_MOVE_COMBINING: | |
350 | rsv->needs_release_companion_mas = false; | |
351 | uwb_drp_avail_reserve(rsv->rc, &mv->companion_mas); | |
352 | bitmap_or(rsv->mas.bm, rsv->mas.bm, mv->companion_mas.bm, UWB_NUM_MAS); | |
353 | rsv->mas.safe += mv->companion_mas.safe; | |
354 | rsv->mas.unsafe += mv->companion_mas.unsafe; | |
355 | uwb_rsv_state_update(rsv, UWB_RSV_STATE_O_MOVE_COMBINING); | |
356 | break; | |
357 | case UWB_RSV_STATE_O_MOVE_REDUCING: | |
358 | bitmap_andnot(mv->companion_mas.bm, rsv->mas.bm, mv->final_mas.bm, UWB_NUM_MAS); | |
359 | rsv->needs_release_companion_mas = true; | |
360 | rsv->mas.safe = mv->final_mas.safe; | |
361 | rsv->mas.unsafe = mv->final_mas.unsafe; | |
362 | bitmap_copy(rsv->mas.bm, mv->final_mas.bm, UWB_NUM_MAS); | |
363 | bitmap_copy(rsv->mas.unsafe_bm, mv->final_mas.unsafe_bm, UWB_NUM_MAS); | |
364 | uwb_rsv_state_update(rsv, UWB_RSV_STATE_O_MOVE_REDUCING); | |
365 | break; | |
8cc13a09 | 366 | case UWB_RSV_STATE_T_ACCEPTED: |
5b37717a SP |
367 | case UWB_RSV_STATE_T_RESIZED: |
368 | rsv->needs_release_companion_mas = false; | |
8cc13a09 DV |
369 | uwb_drp_avail_reserve(rsv->rc, &rsv->mas); |
370 | uwb_rsv_state_update(rsv, UWB_RSV_STATE_T_ACCEPTED); | |
371 | uwb_rsv_callback(rsv); | |
372 | break; | |
373 | case UWB_RSV_STATE_T_DENIED: | |
374 | uwb_rsv_state_update(rsv, UWB_RSV_STATE_T_DENIED); | |
375 | break; | |
5b37717a SP |
376 | case UWB_RSV_STATE_T_CONFLICT: |
377 | uwb_rsv_state_update(rsv, UWB_RSV_STATE_T_CONFLICT); | |
378 | break; | |
379 | case UWB_RSV_STATE_T_PENDING: | |
380 | uwb_rsv_state_update(rsv, UWB_RSV_STATE_T_PENDING); | |
381 | break; | |
382 | case UWB_RSV_STATE_T_EXPANDING_ACCEPTED: | |
383 | rsv->needs_release_companion_mas = true; | |
384 | uwb_drp_avail_reserve(rsv->rc, &mv->companion_mas); | |
385 | uwb_rsv_state_update(rsv, UWB_RSV_STATE_T_EXPANDING_ACCEPTED); | |
386 | break; | |
8cc13a09 DV |
387 | default: |
388 | dev_err(&rsv->rc->uwb_dev.dev, "unhandled state: %s (%d)\n", | |
389 | uwb_rsv_state_str(new_state), new_state); | |
390 | } | |
391 | } | |
392 | ||
5b37717a SP |
393 | static void uwb_rsv_handle_timeout_work(struct work_struct *work) |
394 | { | |
395 | struct uwb_rsv *rsv = container_of(work, struct uwb_rsv, | |
396 | handle_timeout_work); | |
397 | struct uwb_rc *rc = rsv->rc; | |
398 | ||
399 | mutex_lock(&rc->rsvs_mutex); | |
400 | ||
401 | uwb_rsv_dump("TO", rsv); | |
402 | ||
403 | switch (rsv->state) { | |
404 | case UWB_RSV_STATE_O_INITIATED: | |
405 | if (rsv->is_multicast) { | |
406 | uwb_rsv_set_state(rsv, UWB_RSV_STATE_O_ESTABLISHED); | |
407 | goto unlock; | |
408 | } | |
409 | break; | |
410 | case UWB_RSV_STATE_O_MOVE_EXPANDING: | |
411 | if (rsv->is_multicast) { | |
412 | uwb_rsv_set_state(rsv, UWB_RSV_STATE_O_MOVE_COMBINING); | |
413 | goto unlock; | |
414 | } | |
415 | break; | |
416 | case UWB_RSV_STATE_O_MOVE_COMBINING: | |
417 | if (rsv->is_multicast) { | |
418 | uwb_rsv_set_state(rsv, UWB_RSV_STATE_O_MOVE_REDUCING); | |
419 | goto unlock; | |
420 | } | |
421 | break; | |
422 | case UWB_RSV_STATE_O_MOVE_REDUCING: | |
423 | if (rsv->is_multicast) { | |
424 | uwb_rsv_set_state(rsv, UWB_RSV_STATE_O_ESTABLISHED); | |
425 | goto unlock; | |
426 | } | |
427 | break; | |
428 | case UWB_RSV_STATE_O_ESTABLISHED: | |
429 | if (rsv->is_multicast) | |
430 | goto unlock; | |
431 | break; | |
432 | case UWB_RSV_STATE_T_EXPANDING_ACCEPTED: | |
433 | /* | |
434 | * The time out could be for the main or of the | |
435 | * companion DRP, assume it's for the companion and | |
436 | * drop that first. A further time out is required to | |
437 | * drop the main. | |
438 | */ | |
439 | uwb_rsv_set_state(rsv, UWB_RSV_STATE_T_ACCEPTED); | |
440 | uwb_drp_avail_release(rsv->rc, &rsv->mv.companion_mas); | |
441 | goto unlock; | |
442 | default: | |
443 | break; | |
444 | } | |
445 | ||
446 | uwb_rsv_remove(rsv); | |
447 | ||
448 | unlock: | |
449 | mutex_unlock(&rc->rsvs_mutex); | |
450 | } | |
451 | ||
8cc13a09 DV |
452 | static struct uwb_rsv *uwb_rsv_alloc(struct uwb_rc *rc) |
453 | { | |
454 | struct uwb_rsv *rsv; | |
455 | ||
456 | rsv = kzalloc(sizeof(struct uwb_rsv), GFP_KERNEL); | |
457 | if (!rsv) | |
458 | return NULL; | |
459 | ||
460 | INIT_LIST_HEAD(&rsv->rc_node); | |
461 | INIT_LIST_HEAD(&rsv->pal_node); | |
cae1c114 | 462 | kref_init(&rsv->kref); |
8cc13a09 DV |
463 | init_timer(&rsv->timer); |
464 | rsv->timer.function = uwb_rsv_timer; | |
465 | rsv->timer.data = (unsigned long)rsv; | |
466 | ||
467 | rsv->rc = rc; | |
5b37717a | 468 | INIT_WORK(&rsv->handle_timeout_work, uwb_rsv_handle_timeout_work); |
8cc13a09 DV |
469 | |
470 | return rsv; | |
471 | } | |
472 | ||
8cc13a09 DV |
473 | /** |
474 | * uwb_rsv_create - allocate and initialize a UWB reservation structure | |
475 | * @rc: the radio controller | |
476 | * @cb: callback to use when the reservation completes or terminates | |
477 | * @pal_priv: data private to the PAL to be passed in the callback | |
478 | * | |
479 | * The callback is called when the state of the reservation changes from: | |
480 | * | |
481 | * - pending to accepted | |
482 | * - pending to denined | |
483 | * - accepted to terminated | |
484 | * - pending to terminated | |
485 | */ | |
486 | struct uwb_rsv *uwb_rsv_create(struct uwb_rc *rc, uwb_rsv_cb_f cb, void *pal_priv) | |
487 | { | |
488 | struct uwb_rsv *rsv; | |
489 | ||
490 | rsv = uwb_rsv_alloc(rc); | |
491 | if (!rsv) | |
492 | return NULL; | |
493 | ||
494 | rsv->callback = cb; | |
495 | rsv->pal_priv = pal_priv; | |
496 | ||
497 | return rsv; | |
498 | } | |
499 | EXPORT_SYMBOL_GPL(uwb_rsv_create); | |
500 | ||
501 | void uwb_rsv_remove(struct uwb_rsv *rsv) | |
502 | { | |
5b37717a SP |
503 | uwb_rsv_dump("RM", rsv); |
504 | ||
8cc13a09 DV |
505 | if (rsv->state != UWB_RSV_STATE_NONE) |
506 | uwb_rsv_set_state(rsv, UWB_RSV_STATE_NONE); | |
5b37717a SP |
507 | |
508 | if (rsv->needs_release_companion_mas) | |
509 | uwb_drp_avail_release(rsv->rc, &rsv->mv.companion_mas); | |
510 | uwb_drp_avail_release(rsv->rc, &rsv->mas); | |
511 | ||
512 | if (uwb_rsv_is_owner(rsv)) | |
513 | uwb_rsv_put_stream(rsv); | |
514 | ||
8cc13a09 | 515 | del_timer_sync(&rsv->timer); |
cae1c114 DV |
516 | uwb_dev_put(rsv->owner); |
517 | if (rsv->target.type == UWB_RSV_TARGET_DEV) | |
518 | uwb_dev_put(rsv->target.dev); | |
519 | ||
520 | list_del_init(&rsv->rc_node); | |
521 | uwb_rsv_put(rsv); | |
8cc13a09 DV |
522 | } |
523 | ||
524 | /** | |
525 | * uwb_rsv_destroy - free a UWB reservation structure | |
526 | * @rsv: the reservation to free | |
527 | * | |
cae1c114 | 528 | * The reservation must already be terminated. |
8cc13a09 DV |
529 | */ |
530 | void uwb_rsv_destroy(struct uwb_rsv *rsv) | |
531 | { | |
cae1c114 | 532 | uwb_rsv_put(rsv); |
8cc13a09 DV |
533 | } |
534 | EXPORT_SYMBOL_GPL(uwb_rsv_destroy); | |
535 | ||
536 | /** | |
537 | * usb_rsv_establish - start a reservation establishment | |
538 | * @rsv: the reservation | |
539 | * | |
540 | * The PAL should fill in @rsv's owner, target, type, max_mas, | |
5b37717a | 541 | * min_mas, max_interval and is_multicast fields. If the target is a |
8cc13a09 DV |
542 | * uwb_dev it must be referenced. |
543 | * | |
544 | * The reservation's callback will be called when the reservation is | |
545 | * accepted, denied or times out. | |
546 | */ | |
547 | int uwb_rsv_establish(struct uwb_rsv *rsv) | |
548 | { | |
549 | struct uwb_rc *rc = rsv->rc; | |
5b37717a | 550 | struct uwb_mas_bm available; |
8cc13a09 DV |
551 | int ret; |
552 | ||
553 | mutex_lock(&rc->rsvs_mutex); | |
8cc13a09 DV |
554 | ret = uwb_rsv_get_stream(rsv); |
555 | if (ret) | |
556 | goto out; | |
557 | ||
5b37717a SP |
558 | rsv->tiebreaker = random32() & 1; |
559 | /* get available mas bitmap */ | |
560 | uwb_drp_available(rc, &available); | |
561 | ||
562 | ret = uwb_rsv_find_best_allocation(rsv, &available, &rsv->mas); | |
563 | if (ret == UWB_RSV_ALLOC_NOT_FOUND) { | |
564 | ret = -EBUSY; | |
565 | uwb_rsv_put_stream(rsv); | |
566 | goto out; | |
567 | } | |
568 | ||
569 | ret = uwb_drp_avail_reserve_pending(rc, &rsv->mas); | |
570 | if (ret != 0) { | |
8cc13a09 DV |
571 | uwb_rsv_put_stream(rsv); |
572 | goto out; | |
573 | } | |
574 | ||
cae1c114 | 575 | uwb_rsv_get(rsv); |
8cc13a09 DV |
576 | list_add_tail(&rsv->rc_node, &rc->reservations); |
577 | rsv->owner = &rc->uwb_dev; | |
578 | uwb_dev_get(rsv->owner); | |
579 | uwb_rsv_set_state(rsv, UWB_RSV_STATE_O_INITIATED); | |
580 | out: | |
581 | mutex_unlock(&rc->rsvs_mutex); | |
582 | return ret; | |
583 | } | |
584 | EXPORT_SYMBOL_GPL(uwb_rsv_establish); | |
585 | ||
586 | /** | |
587 | * uwb_rsv_modify - modify an already established reservation | |
588 | * @rsv: the reservation to modify | |
589 | * @max_mas: new maximum MAS to reserve | |
590 | * @min_mas: new minimum MAS to reserve | |
5b37717a | 591 | * @max_interval: new max_interval to use |
8cc13a09 DV |
592 | * |
593 | * FIXME: implement this once there are PALs that use it. | |
594 | */ | |
5b37717a | 595 | int uwb_rsv_modify(struct uwb_rsv *rsv, int max_mas, int min_mas, int max_interval) |
8cc13a09 DV |
596 | { |
597 | return -ENOSYS; | |
598 | } | |
599 | EXPORT_SYMBOL_GPL(uwb_rsv_modify); | |
600 | ||
5b37717a SP |
601 | /* |
602 | * move an already established reservation (rc->rsvs_mutex must to be | |
603 | * taken when tis function is called) | |
604 | */ | |
605 | int uwb_rsv_try_move(struct uwb_rsv *rsv, struct uwb_mas_bm *available) | |
606 | { | |
607 | struct uwb_rc *rc = rsv->rc; | |
608 | struct uwb_drp_backoff_win *bow = &rc->bow; | |
609 | struct device *dev = &rc->uwb_dev.dev; | |
610 | struct uwb_rsv_move *mv; | |
611 | int ret = 0; | |
612 | ||
613 | if (bow->can_reserve_extra_mases == false) | |
614 | return -EBUSY; | |
615 | ||
616 | mv = &rsv->mv; | |
617 | ||
618 | if (uwb_rsv_find_best_allocation(rsv, available, &mv->final_mas) == UWB_RSV_ALLOC_FOUND) { | |
619 | ||
620 | if (!bitmap_equal(rsv->mas.bm, mv->final_mas.bm, UWB_NUM_MAS)) { | |
621 | /* We want to move the reservation */ | |
622 | bitmap_andnot(mv->companion_mas.bm, mv->final_mas.bm, rsv->mas.bm, UWB_NUM_MAS); | |
623 | uwb_drp_avail_reserve_pending(rc, &mv->companion_mas); | |
624 | uwb_rsv_set_state(rsv, UWB_RSV_STATE_O_MOVE_EXPANDING); | |
625 | } | |
626 | } else { | |
627 | dev_dbg(dev, "new allocation not found\n"); | |
628 | } | |
629 | ||
630 | return ret; | |
631 | } | |
632 | ||
633 | /* It will try to move every reservation in state O_ESTABLISHED giving | |
634 | * to the MAS allocator algorithm an availability that is the real one | |
635 | * plus the allocation already established from the reservation. */ | |
636 | void uwb_rsv_handle_drp_avail_change(struct uwb_rc *rc) | |
637 | { | |
638 | struct uwb_drp_backoff_win *bow = &rc->bow; | |
639 | struct uwb_rsv *rsv; | |
640 | struct uwb_mas_bm mas; | |
641 | ||
642 | if (bow->can_reserve_extra_mases == false) | |
643 | return; | |
644 | ||
645 | list_for_each_entry(rsv, &rc->reservations, rc_node) { | |
646 | if (rsv->state == UWB_RSV_STATE_O_ESTABLISHED || | |
647 | rsv->state == UWB_RSV_STATE_O_TO_BE_MOVED) { | |
648 | uwb_drp_available(rc, &mas); | |
649 | bitmap_or(mas.bm, mas.bm, rsv->mas.bm, UWB_NUM_MAS); | |
650 | uwb_rsv_try_move(rsv, &mas); | |
651 | } | |
652 | } | |
653 | ||
654 | } | |
655 | ||
8cc13a09 DV |
656 | /** |
657 | * uwb_rsv_terminate - terminate an established reservation | |
658 | * @rsv: the reservation to terminate | |
659 | * | |
660 | * A reservation is terminated by removing the DRP IE from the beacon, | |
661 | * the other end will consider the reservation to be terminated when | |
662 | * it does not see the DRP IE for at least mMaxLostBeacons. | |
663 | * | |
664 | * If applicable, the reference to the target uwb_dev will be released. | |
665 | */ | |
666 | void uwb_rsv_terminate(struct uwb_rsv *rsv) | |
667 | { | |
668 | struct uwb_rc *rc = rsv->rc; | |
669 | ||
670 | mutex_lock(&rc->rsvs_mutex); | |
671 | ||
671e470e DV |
672 | if (rsv->state != UWB_RSV_STATE_NONE) |
673 | uwb_rsv_set_state(rsv, UWB_RSV_STATE_NONE); | |
8cc13a09 DV |
674 | |
675 | mutex_unlock(&rc->rsvs_mutex); | |
676 | } | |
677 | EXPORT_SYMBOL_GPL(uwb_rsv_terminate); | |
678 | ||
679 | /** | |
680 | * uwb_rsv_accept - accept a new reservation from a peer | |
681 | * @rsv: the reservation | |
682 | * @cb: call back for reservation changes | |
683 | * @pal_priv: data to be passed in the above call back | |
684 | * | |
685 | * Reservation requests from peers are denied unless a PAL accepts it | |
686 | * by calling this function. | |
cae1c114 DV |
687 | * |
688 | * The PAL call uwb_rsv_destroy() for all accepted reservations before | |
689 | * calling uwb_pal_unregister(). | |
8cc13a09 DV |
690 | */ |
691 | void uwb_rsv_accept(struct uwb_rsv *rsv, uwb_rsv_cb_f cb, void *pal_priv) | |
692 | { | |
cae1c114 DV |
693 | uwb_rsv_get(rsv); |
694 | ||
8cc13a09 DV |
695 | rsv->callback = cb; |
696 | rsv->pal_priv = pal_priv; | |
697 | rsv->state = UWB_RSV_STATE_T_ACCEPTED; | |
698 | } | |
699 | EXPORT_SYMBOL_GPL(uwb_rsv_accept); | |
700 | ||
701 | /* | |
702 | * Is a received DRP IE for this reservation? | |
703 | */ | |
704 | static bool uwb_rsv_match(struct uwb_rsv *rsv, struct uwb_dev *src, | |
705 | struct uwb_ie_drp *drp_ie) | |
706 | { | |
707 | struct uwb_dev_addr *rsv_src; | |
708 | int stream; | |
709 | ||
710 | stream = uwb_ie_drp_stream_index(drp_ie); | |
711 | ||
712 | if (rsv->stream != stream) | |
713 | return false; | |
714 | ||
715 | switch (rsv->target.type) { | |
716 | case UWB_RSV_TARGET_DEVADDR: | |
717 | return rsv->stream == stream; | |
718 | case UWB_RSV_TARGET_DEV: | |
719 | if (uwb_ie_drp_owner(drp_ie)) | |
720 | rsv_src = &rsv->owner->dev_addr; | |
721 | else | |
722 | rsv_src = &rsv->target.dev->dev_addr; | |
723 | return uwb_dev_addr_cmp(&src->dev_addr, rsv_src) == 0; | |
724 | } | |
725 | return false; | |
726 | } | |
727 | ||
728 | static struct uwb_rsv *uwb_rsv_new_target(struct uwb_rc *rc, | |
729 | struct uwb_dev *src, | |
730 | struct uwb_ie_drp *drp_ie) | |
731 | { | |
732 | struct uwb_rsv *rsv; | |
733 | struct uwb_pal *pal; | |
734 | enum uwb_rsv_state state; | |
735 | ||
736 | rsv = uwb_rsv_alloc(rc); | |
737 | if (!rsv) | |
738 | return NULL; | |
739 | ||
740 | rsv->rc = rc; | |
741 | rsv->owner = src; | |
742 | uwb_dev_get(rsv->owner); | |
743 | rsv->target.type = UWB_RSV_TARGET_DEV; | |
744 | rsv->target.dev = &rc->uwb_dev; | |
5b37717a | 745 | uwb_dev_get(&rc->uwb_dev); |
8cc13a09 DV |
746 | rsv->type = uwb_ie_drp_type(drp_ie); |
747 | rsv->stream = uwb_ie_drp_stream_index(drp_ie); | |
8cc13a09 DV |
748 | uwb_drp_ie_to_bm(&rsv->mas, drp_ie); |
749 | ||
750 | /* | |
751 | * See if any PALs are interested in this reservation. If not, | |
752 | * deny the request. | |
753 | */ | |
754 | rsv->state = UWB_RSV_STATE_T_DENIED; | |
6fae35f9 | 755 | mutex_lock(&rc->uwb_dev.mutex); |
8cc13a09 DV |
756 | list_for_each_entry(pal, &rc->pals, node) { |
757 | if (pal->new_rsv) | |
e17be2b2 | 758 | pal->new_rsv(pal, rsv); |
8cc13a09 DV |
759 | if (rsv->state == UWB_RSV_STATE_T_ACCEPTED) |
760 | break; | |
761 | } | |
6fae35f9 | 762 | mutex_unlock(&rc->uwb_dev.mutex); |
8cc13a09 DV |
763 | |
764 | list_add_tail(&rsv->rc_node, &rc->reservations); | |
765 | state = rsv->state; | |
766 | rsv->state = UWB_RSV_STATE_NONE; | |
5b37717a SP |
767 | |
768 | /* FIXME: do something sensible here */ | |
769 | if (state == UWB_RSV_STATE_T_ACCEPTED | |
770 | && uwb_drp_avail_reserve_pending(rc, &rsv->mas) == -EBUSY) { | |
771 | /* FIXME: do something sensible here */ | |
772 | } else { | |
773 | uwb_rsv_set_state(rsv, state); | |
774 | } | |
8cc13a09 DV |
775 | |
776 | return rsv; | |
777 | } | |
778 | ||
5b37717a SP |
779 | /** |
780 | * uwb_rsv_get_usable_mas - get the bitmap of the usable MAS of a reservations | |
781 | * @rsv: the reservation. | |
782 | * @mas: returns the available MAS. | |
783 | * | |
784 | * The usable MAS of a reservation may be less than the negotiated MAS | |
785 | * if alien BPs are present. | |
786 | */ | |
787 | void uwb_rsv_get_usable_mas(struct uwb_rsv *rsv, struct uwb_mas_bm *mas) | |
788 | { | |
789 | bitmap_zero(mas->bm, UWB_NUM_MAS); | |
790 | bitmap_andnot(mas->bm, rsv->mas.bm, rsv->rc->cnflt_alien_bitmap.bm, UWB_NUM_MAS); | |
791 | } | |
792 | EXPORT_SYMBOL_GPL(uwb_rsv_get_usable_mas); | |
793 | ||
8cc13a09 DV |
794 | /** |
795 | * uwb_rsv_find - find a reservation for a received DRP IE. | |
796 | * @rc: the radio controller | |
797 | * @src: source of the DRP IE | |
798 | * @drp_ie: the DRP IE | |
799 | * | |
800 | * If the reservation cannot be found and the DRP IE is from a peer | |
801 | * attempting to establish a new reservation, create a new reservation | |
802 | * and add it to the list. | |
803 | */ | |
804 | struct uwb_rsv *uwb_rsv_find(struct uwb_rc *rc, struct uwb_dev *src, | |
805 | struct uwb_ie_drp *drp_ie) | |
806 | { | |
807 | struct uwb_rsv *rsv; | |
808 | ||
809 | list_for_each_entry(rsv, &rc->reservations, rc_node) { | |
810 | if (uwb_rsv_match(rsv, src, drp_ie)) | |
811 | return rsv; | |
812 | } | |
813 | ||
814 | if (uwb_ie_drp_owner(drp_ie)) | |
815 | return uwb_rsv_new_target(rc, src, drp_ie); | |
816 | ||
817 | return NULL; | |
818 | } | |
819 | ||
820 | /* | |
821 | * Go through all the reservations and check for timeouts and (if | |
822 | * necessary) update their DRP IEs. | |
823 | * | |
824 | * FIXME: look at building the SET_DRP_IE command here rather than | |
825 | * having to rescan the list in uwb_rc_send_all_drp_ie(). | |
826 | */ | |
827 | static bool uwb_rsv_update_all(struct uwb_rc *rc) | |
828 | { | |
829 | struct uwb_rsv *rsv, *t; | |
830 | bool ie_updated = false; | |
831 | ||
832 | list_for_each_entry_safe(rsv, t, &rc->reservations, rc_node) { | |
8cc13a09 DV |
833 | if (!rsv->ie_valid) { |
834 | uwb_drp_ie_update(rsv); | |
835 | ie_updated = true; | |
836 | } | |
837 | } | |
838 | ||
839 | return ie_updated; | |
840 | } | |
841 | ||
5b37717a SP |
842 | void uwb_rsv_queue_update(struct uwb_rc *rc) |
843 | { | |
844 | unsigned long delay_us = UWB_MAS_LENGTH_US * UWB_MAS_PER_ZONE; | |
845 | ||
846 | queue_delayed_work(rc->rsv_workq, &rc->rsv_update_work, usecs_to_jiffies(delay_us)); | |
847 | } | |
848 | ||
849 | /** | |
850 | * uwb_rsv_sched_update - schedule an update of the DRP IEs | |
851 | * @rc: the radio controller. | |
852 | * | |
853 | * To improve performance and ensure correctness with [ECMA-368] the | |
854 | * number of SET-DRP-IE commands that are done are limited. | |
855 | * | |
856 | * DRP IEs update come from two sources: DRP events from the hardware | |
857 | * which all occur at the beginning of the superframe ('syncronous' | |
858 | * events) and reservation establishment/termination requests from | |
859 | * PALs or timers ('asynchronous' events). | |
860 | * | |
861 | * A delayed work ensures that all the synchronous events result in | |
862 | * one SET-DRP-IE command. | |
863 | * | |
864 | * Additional logic (the set_drp_ie_pending and rsv_updated_postponed | |
865 | * flags) will prevent an asynchrous event starting a SET-DRP-IE | |
866 | * command if one is currently awaiting a response. | |
867 | * | |
868 | * FIXME: this does leave a window where an asynchrous event can delay | |
869 | * the SET-DRP-IE for a synchronous event by one superframe. | |
870 | */ | |
8cc13a09 DV |
871 | void uwb_rsv_sched_update(struct uwb_rc *rc) |
872 | { | |
5b37717a SP |
873 | spin_lock(&rc->rsvs_lock); |
874 | if (!delayed_work_pending(&rc->rsv_update_work)) { | |
875 | if (rc->set_drp_ie_pending > 0) { | |
876 | rc->set_drp_ie_pending++; | |
877 | goto unlock; | |
878 | } | |
879 | uwb_rsv_queue_update(rc); | |
880 | } | |
881 | unlock: | |
882 | spin_unlock(&rc->rsvs_lock); | |
8cc13a09 DV |
883 | } |
884 | ||
885 | /* | |
886 | * Update DRP IEs and, if necessary, the DRP Availability IE and send | |
887 | * the updated IEs to the radio controller. | |
888 | */ | |
889 | static void uwb_rsv_update_work(struct work_struct *work) | |
890 | { | |
5b37717a SP |
891 | struct uwb_rc *rc = container_of(work, struct uwb_rc, |
892 | rsv_update_work.work); | |
8cc13a09 DV |
893 | bool ie_updated; |
894 | ||
895 | mutex_lock(&rc->rsvs_mutex); | |
896 | ||
897 | ie_updated = uwb_rsv_update_all(rc); | |
898 | ||
899 | if (!rc->drp_avail.ie_valid) { | |
900 | uwb_drp_avail_ie_update(rc); | |
901 | ie_updated = true; | |
902 | } | |
903 | ||
5b37717a | 904 | if (ie_updated && (rc->set_drp_ie_pending == 0)) |
8cc13a09 DV |
905 | uwb_rc_send_all_drp_ie(rc); |
906 | ||
907 | mutex_unlock(&rc->rsvs_mutex); | |
908 | } | |
909 | ||
5b37717a SP |
910 | static void uwb_rsv_alien_bp_work(struct work_struct *work) |
911 | { | |
912 | struct uwb_rc *rc = container_of(work, struct uwb_rc, | |
913 | rsv_alien_bp_work.work); | |
914 | struct uwb_rsv *rsv; | |
915 | ||
916 | mutex_lock(&rc->rsvs_mutex); | |
917 | ||
918 | list_for_each_entry(rsv, &rc->reservations, rc_node) { | |
919 | if (rsv->type != UWB_DRP_TYPE_ALIEN_BP) { | |
920 | rsv->callback(rsv); | |
921 | } | |
922 | } | |
923 | ||
924 | mutex_unlock(&rc->rsvs_mutex); | |
925 | } | |
926 | ||
8cc13a09 DV |
927 | static void uwb_rsv_timer(unsigned long arg) |
928 | { | |
929 | struct uwb_rsv *rsv = (struct uwb_rsv *)arg; | |
930 | ||
5b37717a | 931 | queue_work(rsv->rc->rsv_workq, &rsv->handle_timeout_work); |
8cc13a09 DV |
932 | } |
933 | ||
307ba6dd DV |
934 | /** |
935 | * uwb_rsv_remove_all - remove all reservations | |
936 | * @rc: the radio controller | |
937 | * | |
938 | * A DRP IE update is not done. | |
939 | */ | |
940 | void uwb_rsv_remove_all(struct uwb_rc *rc) | |
941 | { | |
942 | struct uwb_rsv *rsv, *t; | |
943 | ||
944 | mutex_lock(&rc->rsvs_mutex); | |
945 | list_for_each_entry_safe(rsv, t, &rc->reservations, rc_node) { | |
946 | uwb_rsv_remove(rsv); | |
947 | } | |
5b37717a SP |
948 | /* Cancel any postponed update. */ |
949 | rc->set_drp_ie_pending = 0; | |
307ba6dd DV |
950 | mutex_unlock(&rc->rsvs_mutex); |
951 | ||
5b37717a | 952 | cancel_delayed_work_sync(&rc->rsv_update_work); |
307ba6dd DV |
953 | } |
954 | ||
8cc13a09 DV |
955 | void uwb_rsv_init(struct uwb_rc *rc) |
956 | { | |
957 | INIT_LIST_HEAD(&rc->reservations); | |
5b37717a | 958 | INIT_LIST_HEAD(&rc->cnflt_alien_list); |
8cc13a09 | 959 | mutex_init(&rc->rsvs_mutex); |
5b37717a SP |
960 | spin_lock_init(&rc->rsvs_lock); |
961 | INIT_DELAYED_WORK(&rc->rsv_update_work, uwb_rsv_update_work); | |
962 | INIT_DELAYED_WORK(&rc->rsv_alien_bp_work, uwb_rsv_alien_bp_work); | |
963 | rc->bow.can_reserve_extra_mases = true; | |
964 | rc->bow.total_expired = 0; | |
965 | rc->bow.window = UWB_DRP_BACKOFF_WIN_MIN >> 1; | |
966 | init_timer(&rc->bow.timer); | |
967 | rc->bow.timer.function = uwb_rsv_backoff_win_timer; | |
968 | rc->bow.timer.data = (unsigned long)&rc->bow; | |
8cc13a09 DV |
969 | |
970 | bitmap_complement(rc->uwb_dev.streams, rc->uwb_dev.streams, UWB_NUM_STREAMS); | |
971 | } | |
972 | ||
973 | int uwb_rsv_setup(struct uwb_rc *rc) | |
974 | { | |
975 | char name[16]; | |
976 | ||
977 | snprintf(name, sizeof(name), "%s_rsvd", dev_name(&rc->uwb_dev.dev)); | |
978 | rc->rsv_workq = create_singlethread_workqueue(name); | |
979 | if (rc->rsv_workq == NULL) | |
980 | return -ENOMEM; | |
981 | ||
982 | return 0; | |
983 | } | |
984 | ||
985 | void uwb_rsv_cleanup(struct uwb_rc *rc) | |
986 | { | |
307ba6dd | 987 | uwb_rsv_remove_all(rc); |
8cc13a09 DV |
988 | destroy_workqueue(rc->rsv_workq); |
989 | } |