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> |
475c0a6b | 22 | #include <linux/export.h> |
8cc13a09 DV |
23 | |
24 | #include "uwb-internal.h" | |
25 | ||
26 | static void uwb_rsv_timer(unsigned long arg); | |
27 | ||
28 | static const char *rsv_states[] = { | |
5b37717a SP |
29 | [UWB_RSV_STATE_NONE] = "none ", |
30 | [UWB_RSV_STATE_O_INITIATED] = "o initiated ", | |
31 | [UWB_RSV_STATE_O_PENDING] = "o pending ", | |
32 | [UWB_RSV_STATE_O_MODIFIED] = "o modified ", | |
33 | [UWB_RSV_STATE_O_ESTABLISHED] = "o established ", | |
34 | [UWB_RSV_STATE_O_TO_BE_MOVED] = "o to be moved ", | |
35 | [UWB_RSV_STATE_O_MOVE_EXPANDING] = "o move expanding", | |
36 | [UWB_RSV_STATE_O_MOVE_COMBINING] = "o move combining", | |
37 | [UWB_RSV_STATE_O_MOVE_REDUCING] = "o move reducing ", | |
38 | [UWB_RSV_STATE_T_ACCEPTED] = "t accepted ", | |
39 | [UWB_RSV_STATE_T_CONFLICT] = "t conflict ", | |
40 | [UWB_RSV_STATE_T_PENDING] = "t pending ", | |
41 | [UWB_RSV_STATE_T_DENIED] = "t denied ", | |
42 | [UWB_RSV_STATE_T_RESIZED] = "t resized ", | |
43 | [UWB_RSV_STATE_T_EXPANDING_ACCEPTED] = "t expanding acc ", | |
44 | [UWB_RSV_STATE_T_EXPANDING_CONFLICT] = "t expanding conf", | |
45 | [UWB_RSV_STATE_T_EXPANDING_PENDING] = "t expanding pend", | |
46 | [UWB_RSV_STATE_T_EXPANDING_DENIED] = "t expanding den ", | |
8cc13a09 DV |
47 | }; |
48 | ||
49 | static const char *rsv_types[] = { | |
50 | [UWB_DRP_TYPE_ALIEN_BP] = "alien-bp", | |
51 | [UWB_DRP_TYPE_HARD] = "hard", | |
52 | [UWB_DRP_TYPE_SOFT] = "soft", | |
53 | [UWB_DRP_TYPE_PRIVATE] = "private", | |
54 | [UWB_DRP_TYPE_PCA] = "pca", | |
55 | }; | |
56 | ||
5b37717a SP |
57 | bool uwb_rsv_has_two_drp_ies(struct uwb_rsv *rsv) |
58 | { | |
59 | static const bool has_two_drp_ies[] = { | |
60 | [UWB_RSV_STATE_O_INITIATED] = false, | |
61 | [UWB_RSV_STATE_O_PENDING] = false, | |
62 | [UWB_RSV_STATE_O_MODIFIED] = false, | |
63 | [UWB_RSV_STATE_O_ESTABLISHED] = false, | |
64 | [UWB_RSV_STATE_O_TO_BE_MOVED] = false, | |
65 | [UWB_RSV_STATE_O_MOVE_COMBINING] = false, | |
66 | [UWB_RSV_STATE_O_MOVE_REDUCING] = false, | |
67 | [UWB_RSV_STATE_O_MOVE_EXPANDING] = true, | |
68 | [UWB_RSV_STATE_T_ACCEPTED] = false, | |
69 | [UWB_RSV_STATE_T_CONFLICT] = false, | |
70 | [UWB_RSV_STATE_T_PENDING] = false, | |
71 | [UWB_RSV_STATE_T_DENIED] = false, | |
72 | [UWB_RSV_STATE_T_RESIZED] = false, | |
73 | [UWB_RSV_STATE_T_EXPANDING_ACCEPTED] = true, | |
74 | [UWB_RSV_STATE_T_EXPANDING_CONFLICT] = true, | |
75 | [UWB_RSV_STATE_T_EXPANDING_PENDING] = true, | |
76 | [UWB_RSV_STATE_T_EXPANDING_DENIED] = true, | |
77 | }; | |
78 | ||
79 | return has_two_drp_ies[rsv->state]; | |
80 | } | |
81 | ||
8cc13a09 DV |
82 | /** |
83 | * uwb_rsv_state_str - return a string for a reservation state | |
84 | * @state: the reservation state. | |
85 | */ | |
86 | const char *uwb_rsv_state_str(enum uwb_rsv_state state) | |
87 | { | |
88 | if (state < UWB_RSV_STATE_NONE || state >= UWB_RSV_STATE_LAST) | |
89 | return "unknown"; | |
90 | return rsv_states[state]; | |
91 | } | |
92 | EXPORT_SYMBOL_GPL(uwb_rsv_state_str); | |
93 | ||
94 | /** | |
95 | * uwb_rsv_type_str - return a string for a reservation type | |
96 | * @type: the reservation type | |
97 | */ | |
98 | const char *uwb_rsv_type_str(enum uwb_drp_type type) | |
99 | { | |
100 | if (type < UWB_DRP_TYPE_ALIEN_BP || type > UWB_DRP_TYPE_PCA) | |
101 | return "invalid"; | |
102 | return rsv_types[type]; | |
103 | } | |
104 | EXPORT_SYMBOL_GPL(uwb_rsv_type_str); | |
105 | ||
5b37717a | 106 | void uwb_rsv_dump(char *text, struct uwb_rsv *rsv) |
8cc13a09 DV |
107 | { |
108 | struct device *dev = &rsv->rc->uwb_dev.dev; | |
109 | struct uwb_dev_addr devaddr; | |
110 | char owner[UWB_ADDR_STRSIZE], target[UWB_ADDR_STRSIZE]; | |
111 | ||
112 | uwb_dev_addr_print(owner, sizeof(owner), &rsv->owner->dev_addr); | |
113 | if (rsv->target.type == UWB_RSV_TARGET_DEV) | |
114 | devaddr = rsv->target.dev->dev_addr; | |
115 | else | |
116 | devaddr = rsv->target.devaddr; | |
117 | uwb_dev_addr_print(target, sizeof(target), &devaddr); | |
118 | ||
2226b1c2 DV |
119 | dev_dbg(dev, "rsv %s %s -> %s: %s\n", |
120 | text, owner, target, uwb_rsv_state_str(rsv->state)); | |
8cc13a09 DV |
121 | } |
122 | ||
cae1c114 DV |
123 | static void uwb_rsv_release(struct kref *kref) |
124 | { | |
125 | struct uwb_rsv *rsv = container_of(kref, struct uwb_rsv, kref); | |
126 | ||
127 | kfree(rsv); | |
128 | } | |
129 | ||
5b37717a | 130 | void uwb_rsv_get(struct uwb_rsv *rsv) |
cae1c114 DV |
131 | { |
132 | kref_get(&rsv->kref); | |
133 | } | |
134 | ||
5b37717a | 135 | void uwb_rsv_put(struct uwb_rsv *rsv) |
cae1c114 DV |
136 | { |
137 | kref_put(&rsv->kref, uwb_rsv_release); | |
138 | } | |
139 | ||
8cc13a09 DV |
140 | /* |
141 | * Get a free stream index for a reservation. | |
142 | * | |
143 | * If the target is a DevAddr (e.g., a WUSB cluster reservation) then | |
144 | * the stream is allocated from a pool of per-RC stream indexes, | |
145 | * otherwise a unique stream index for the target is selected. | |
146 | */ | |
147 | static int uwb_rsv_get_stream(struct uwb_rsv *rsv) | |
148 | { | |
149 | struct uwb_rc *rc = rsv->rc; | |
5b37717a | 150 | struct device *dev = &rc->uwb_dev.dev; |
8cc13a09 DV |
151 | unsigned long *streams_bm; |
152 | int stream; | |
153 | ||
154 | switch (rsv->target.type) { | |
155 | case UWB_RSV_TARGET_DEV: | |
156 | streams_bm = rsv->target.dev->streams; | |
157 | break; | |
158 | case UWB_RSV_TARGET_DEVADDR: | |
159 | streams_bm = rc->uwb_dev.streams; | |
160 | break; | |
161 | default: | |
162 | return -EINVAL; | |
163 | } | |
164 | ||
165 | stream = find_first_zero_bit(streams_bm, UWB_NUM_STREAMS); | |
7b360ee0 TP |
166 | if (stream >= UWB_NUM_STREAMS) { |
167 | dev_err(dev, "%s: no available stream found\n", __func__); | |
8cc13a09 | 168 | return -EBUSY; |
7b360ee0 | 169 | } |
8cc13a09 DV |
170 | |
171 | rsv->stream = stream; | |
172 | set_bit(stream, streams_bm); | |
173 | ||
5b37717a SP |
174 | dev_dbg(dev, "get stream %d\n", rsv->stream); |
175 | ||
8cc13a09 DV |
176 | return 0; |
177 | } | |
178 | ||
179 | static void uwb_rsv_put_stream(struct uwb_rsv *rsv) | |
180 | { | |
181 | struct uwb_rc *rc = rsv->rc; | |
5b37717a | 182 | struct device *dev = &rc->uwb_dev.dev; |
8cc13a09 DV |
183 | unsigned long *streams_bm; |
184 | ||
185 | switch (rsv->target.type) { | |
186 | case UWB_RSV_TARGET_DEV: | |
187 | streams_bm = rsv->target.dev->streams; | |
188 | break; | |
189 | case UWB_RSV_TARGET_DEVADDR: | |
190 | streams_bm = rc->uwb_dev.streams; | |
191 | break; | |
192 | default: | |
193 | return; | |
194 | } | |
195 | ||
196 | clear_bit(rsv->stream, streams_bm); | |
5b37717a SP |
197 | |
198 | dev_dbg(dev, "put stream %d\n", rsv->stream); | |
8cc13a09 DV |
199 | } |
200 | ||
5b37717a | 201 | void uwb_rsv_backoff_win_timer(unsigned long arg) |
8cc13a09 | 202 | { |
5b37717a SP |
203 | struct uwb_drp_backoff_win *bow = (struct uwb_drp_backoff_win *)arg; |
204 | struct uwb_rc *rc = container_of(bow, struct uwb_rc, bow); | |
205 | struct device *dev = &rc->uwb_dev.dev; | |
8cc13a09 | 206 | |
5b37717a SP |
207 | bow->can_reserve_extra_mases = true; |
208 | if (bow->total_expired <= 4) { | |
209 | bow->total_expired++; | |
210 | } else { | |
211 | /* after 4 backoff window has expired we can exit from | |
212 | * the backoff procedure */ | |
213 | bow->total_expired = 0; | |
214 | bow->window = UWB_DRP_BACKOFF_WIN_MIN >> 1; | |
8cc13a09 | 215 | } |
d9c3ae28 | 216 | dev_dbg(dev, "backoff_win_timer total_expired=%d, n=%d\n", bow->total_expired, bow->n); |
5b37717a SP |
217 | |
218 | /* try to relocate all the "to be moved" relocations */ | |
219 | uwb_rsv_handle_drp_avail_change(rc); | |
8cc13a09 DV |
220 | } |
221 | ||
5b37717a | 222 | void uwb_rsv_backoff_win_increment(struct uwb_rc *rc) |
8cc13a09 | 223 | { |
5b37717a SP |
224 | struct uwb_drp_backoff_win *bow = &rc->bow; |
225 | struct device *dev = &rc->uwb_dev.dev; | |
226 | unsigned timeout_us; | |
8cc13a09 | 227 | |
5b37717a | 228 | dev_dbg(dev, "backoff_win_increment: window=%d\n", bow->window); |
8cc13a09 | 229 | |
5b37717a | 230 | bow->can_reserve_extra_mases = false; |
8cc13a09 | 231 | |
5b37717a SP |
232 | if((bow->window << 1) == UWB_DRP_BACKOFF_WIN_MAX) |
233 | return; | |
8cc13a09 | 234 | |
5b37717a | 235 | bow->window <<= 1; |
78782023 | 236 | bow->n = prandom_u32() & (bow->window - 1); |
d9c3ae28 | 237 | dev_dbg(dev, "new_window=%d, n=%d\n", bow->window, bow->n); |
8cc13a09 | 238 | |
5b37717a SP |
239 | /* reset the timer associated variables */ |
240 | timeout_us = bow->n * UWB_SUPERFRAME_LENGTH_US; | |
241 | bow->total_expired = 0; | |
67d0fb25 | 242 | mod_timer(&bow->timer, jiffies + usecs_to_jiffies(timeout_us)); |
8cc13a09 DV |
243 | } |
244 | ||
245 | static void uwb_rsv_stroke_timer(struct uwb_rsv *rsv) | |
246 | { | |
247 | int sframes = UWB_MAX_LOST_BEACONS; | |
248 | ||
249 | /* | |
250 | * Multicast reservations can become established within 1 | |
251 | * super frame and should not be terminated if no response is | |
252 | * received. | |
253 | */ | |
90ec00d5 TP |
254 | if (rsv->state == UWB_RSV_STATE_NONE) { |
255 | sframes = 0; | |
256 | } else if (rsv->is_multicast) { | |
5b37717a SP |
257 | if (rsv->state == UWB_RSV_STATE_O_INITIATED |
258 | || rsv->state == UWB_RSV_STATE_O_MOVE_EXPANDING | |
259 | || rsv->state == UWB_RSV_STATE_O_MOVE_COMBINING | |
260 | || rsv->state == UWB_RSV_STATE_O_MOVE_REDUCING) | |
8cc13a09 DV |
261 | sframes = 1; |
262 | if (rsv->state == UWB_RSV_STATE_O_ESTABLISHED) | |
263 | sframes = 0; | |
67d0fb25 | 264 | |
8cc13a09 DV |
265 | } |
266 | ||
8cc13a09 DV |
267 | if (sframes > 0) { |
268 | /* | |
269 | * Add an additional 2 superframes to account for the | |
270 | * time to send the SET DRP IE command. | |
271 | */ | |
272 | unsigned timeout_us = (sframes + 2) * UWB_SUPERFRAME_LENGTH_US; | |
273 | mod_timer(&rsv->timer, jiffies + usecs_to_jiffies(timeout_us)); | |
274 | } else | |
275 | del_timer(&rsv->timer); | |
276 | } | |
277 | ||
278 | /* | |
279 | * Update a reservations state, and schedule an update of the | |
280 | * transmitted DRP IEs. | |
281 | */ | |
282 | static void uwb_rsv_state_update(struct uwb_rsv *rsv, | |
283 | enum uwb_rsv_state new_state) | |
284 | { | |
285 | rsv->state = new_state; | |
286 | rsv->ie_valid = false; | |
287 | ||
5b37717a | 288 | uwb_rsv_dump("SU", rsv); |
8cc13a09 DV |
289 | |
290 | uwb_rsv_stroke_timer(rsv); | |
291 | uwb_rsv_sched_update(rsv->rc); | |
292 | } | |
293 | ||
294 | static void uwb_rsv_callback(struct uwb_rsv *rsv) | |
295 | { | |
296 | if (rsv->callback) | |
297 | rsv->callback(rsv); | |
298 | } | |
299 | ||
300 | void uwb_rsv_set_state(struct uwb_rsv *rsv, enum uwb_rsv_state new_state) | |
301 | { | |
5b37717a SP |
302 | struct uwb_rsv_move *mv = &rsv->mv; |
303 | ||
8cc13a09 DV |
304 | if (rsv->state == new_state) { |
305 | switch (rsv->state) { | |
306 | case UWB_RSV_STATE_O_ESTABLISHED: | |
5b37717a SP |
307 | case UWB_RSV_STATE_O_MOVE_EXPANDING: |
308 | case UWB_RSV_STATE_O_MOVE_COMBINING: | |
309 | case UWB_RSV_STATE_O_MOVE_REDUCING: | |
8cc13a09 | 310 | case UWB_RSV_STATE_T_ACCEPTED: |
5b37717a SP |
311 | case UWB_RSV_STATE_T_EXPANDING_ACCEPTED: |
312 | case UWB_RSV_STATE_T_RESIZED: | |
8cc13a09 DV |
313 | case UWB_RSV_STATE_NONE: |
314 | uwb_rsv_stroke_timer(rsv); | |
315 | break; | |
316 | default: | |
317 | /* Expecting a state transition so leave timer | |
318 | as-is. */ | |
319 | break; | |
320 | } | |
321 | return; | |
322 | } | |
323 | ||
5b37717a SP |
324 | uwb_rsv_dump("SC", rsv); |
325 | ||
8cc13a09 DV |
326 | switch (new_state) { |
327 | case UWB_RSV_STATE_NONE: | |
8cc13a09 | 328 | uwb_rsv_state_update(rsv, UWB_RSV_STATE_NONE); |
90ec00d5 | 329 | uwb_rsv_remove(rsv); |
8cc13a09 DV |
330 | uwb_rsv_callback(rsv); |
331 | break; | |
332 | case UWB_RSV_STATE_O_INITIATED: | |
333 | uwb_rsv_state_update(rsv, UWB_RSV_STATE_O_INITIATED); | |
334 | break; | |
335 | case UWB_RSV_STATE_O_PENDING: | |
336 | uwb_rsv_state_update(rsv, UWB_RSV_STATE_O_PENDING); | |
337 | break; | |
5b37717a SP |
338 | case UWB_RSV_STATE_O_MODIFIED: |
339 | /* in the companion there are the MASes to drop */ | |
340 | bitmap_andnot(rsv->mas.bm, rsv->mas.bm, mv->companion_mas.bm, UWB_NUM_MAS); | |
341 | uwb_rsv_state_update(rsv, UWB_RSV_STATE_O_MODIFIED); | |
342 | break; | |
8cc13a09 | 343 | case UWB_RSV_STATE_O_ESTABLISHED: |
5b37717a SP |
344 | if (rsv->state == UWB_RSV_STATE_O_MODIFIED |
345 | || rsv->state == UWB_RSV_STATE_O_MOVE_REDUCING) { | |
346 | uwb_drp_avail_release(rsv->rc, &mv->companion_mas); | |
347 | rsv->needs_release_companion_mas = false; | |
348 | } | |
8cc13a09 DV |
349 | uwb_drp_avail_reserve(rsv->rc, &rsv->mas); |
350 | uwb_rsv_state_update(rsv, UWB_RSV_STATE_O_ESTABLISHED); | |
351 | uwb_rsv_callback(rsv); | |
352 | break; | |
5b37717a SP |
353 | case UWB_RSV_STATE_O_MOVE_EXPANDING: |
354 | rsv->needs_release_companion_mas = true; | |
355 | uwb_rsv_state_update(rsv, UWB_RSV_STATE_O_MOVE_EXPANDING); | |
356 | break; | |
357 | case UWB_RSV_STATE_O_MOVE_COMBINING: | |
358 | rsv->needs_release_companion_mas = false; | |
359 | uwb_drp_avail_reserve(rsv->rc, &mv->companion_mas); | |
360 | bitmap_or(rsv->mas.bm, rsv->mas.bm, mv->companion_mas.bm, UWB_NUM_MAS); | |
361 | rsv->mas.safe += mv->companion_mas.safe; | |
362 | rsv->mas.unsafe += mv->companion_mas.unsafe; | |
363 | uwb_rsv_state_update(rsv, UWB_RSV_STATE_O_MOVE_COMBINING); | |
364 | break; | |
365 | case UWB_RSV_STATE_O_MOVE_REDUCING: | |
366 | bitmap_andnot(mv->companion_mas.bm, rsv->mas.bm, mv->final_mas.bm, UWB_NUM_MAS); | |
367 | rsv->needs_release_companion_mas = true; | |
368 | rsv->mas.safe = mv->final_mas.safe; | |
369 | rsv->mas.unsafe = mv->final_mas.unsafe; | |
370 | bitmap_copy(rsv->mas.bm, mv->final_mas.bm, UWB_NUM_MAS); | |
371 | bitmap_copy(rsv->mas.unsafe_bm, mv->final_mas.unsafe_bm, UWB_NUM_MAS); | |
372 | uwb_rsv_state_update(rsv, UWB_RSV_STATE_O_MOVE_REDUCING); | |
373 | break; | |
8cc13a09 | 374 | case UWB_RSV_STATE_T_ACCEPTED: |
5b37717a SP |
375 | case UWB_RSV_STATE_T_RESIZED: |
376 | rsv->needs_release_companion_mas = false; | |
8cc13a09 DV |
377 | uwb_drp_avail_reserve(rsv->rc, &rsv->mas); |
378 | uwb_rsv_state_update(rsv, UWB_RSV_STATE_T_ACCEPTED); | |
379 | uwb_rsv_callback(rsv); | |
380 | break; | |
381 | case UWB_RSV_STATE_T_DENIED: | |
382 | uwb_rsv_state_update(rsv, UWB_RSV_STATE_T_DENIED); | |
383 | break; | |
5b37717a SP |
384 | case UWB_RSV_STATE_T_CONFLICT: |
385 | uwb_rsv_state_update(rsv, UWB_RSV_STATE_T_CONFLICT); | |
386 | break; | |
387 | case UWB_RSV_STATE_T_PENDING: | |
388 | uwb_rsv_state_update(rsv, UWB_RSV_STATE_T_PENDING); | |
389 | break; | |
390 | case UWB_RSV_STATE_T_EXPANDING_ACCEPTED: | |
391 | rsv->needs_release_companion_mas = true; | |
392 | uwb_drp_avail_reserve(rsv->rc, &mv->companion_mas); | |
393 | uwb_rsv_state_update(rsv, UWB_RSV_STATE_T_EXPANDING_ACCEPTED); | |
394 | break; | |
8cc13a09 DV |
395 | default: |
396 | dev_err(&rsv->rc->uwb_dev.dev, "unhandled state: %s (%d)\n", | |
397 | uwb_rsv_state_str(new_state), new_state); | |
398 | } | |
399 | } | |
400 | ||
5b37717a SP |
401 | static void uwb_rsv_handle_timeout_work(struct work_struct *work) |
402 | { | |
403 | struct uwb_rsv *rsv = container_of(work, struct uwb_rsv, | |
404 | handle_timeout_work); | |
405 | struct uwb_rc *rc = rsv->rc; | |
406 | ||
407 | mutex_lock(&rc->rsvs_mutex); | |
408 | ||
409 | uwb_rsv_dump("TO", rsv); | |
410 | ||
411 | switch (rsv->state) { | |
412 | case UWB_RSV_STATE_O_INITIATED: | |
413 | if (rsv->is_multicast) { | |
414 | uwb_rsv_set_state(rsv, UWB_RSV_STATE_O_ESTABLISHED); | |
415 | goto unlock; | |
416 | } | |
417 | break; | |
418 | case UWB_RSV_STATE_O_MOVE_EXPANDING: | |
419 | if (rsv->is_multicast) { | |
420 | uwb_rsv_set_state(rsv, UWB_RSV_STATE_O_MOVE_COMBINING); | |
421 | goto unlock; | |
422 | } | |
423 | break; | |
424 | case UWB_RSV_STATE_O_MOVE_COMBINING: | |
425 | if (rsv->is_multicast) { | |
426 | uwb_rsv_set_state(rsv, UWB_RSV_STATE_O_MOVE_REDUCING); | |
427 | goto unlock; | |
428 | } | |
429 | break; | |
430 | case UWB_RSV_STATE_O_MOVE_REDUCING: | |
431 | if (rsv->is_multicast) { | |
432 | uwb_rsv_set_state(rsv, UWB_RSV_STATE_O_ESTABLISHED); | |
433 | goto unlock; | |
434 | } | |
435 | break; | |
436 | case UWB_RSV_STATE_O_ESTABLISHED: | |
437 | if (rsv->is_multicast) | |
438 | goto unlock; | |
439 | break; | |
440 | case UWB_RSV_STATE_T_EXPANDING_ACCEPTED: | |
441 | /* | |
442 | * The time out could be for the main or of the | |
443 | * companion DRP, assume it's for the companion and | |
444 | * drop that first. A further time out is required to | |
445 | * drop the main. | |
446 | */ | |
447 | uwb_rsv_set_state(rsv, UWB_RSV_STATE_T_ACCEPTED); | |
448 | uwb_drp_avail_release(rsv->rc, &rsv->mv.companion_mas); | |
449 | goto unlock; | |
90ec00d5 TP |
450 | case UWB_RSV_STATE_NONE: |
451 | goto unlock; | |
5b37717a SP |
452 | default: |
453 | break; | |
454 | } | |
455 | ||
456 | uwb_rsv_remove(rsv); | |
457 | ||
458 | unlock: | |
459 | mutex_unlock(&rc->rsvs_mutex); | |
460 | } | |
461 | ||
8cc13a09 DV |
462 | static struct uwb_rsv *uwb_rsv_alloc(struct uwb_rc *rc) |
463 | { | |
464 | struct uwb_rsv *rsv; | |
465 | ||
466 | rsv = kzalloc(sizeof(struct uwb_rsv), GFP_KERNEL); | |
467 | if (!rsv) | |
468 | return NULL; | |
469 | ||
470 | INIT_LIST_HEAD(&rsv->rc_node); | |
471 | INIT_LIST_HEAD(&rsv->pal_node); | |
cae1c114 | 472 | kref_init(&rsv->kref); |
8cc13a09 DV |
473 | init_timer(&rsv->timer); |
474 | rsv->timer.function = uwb_rsv_timer; | |
475 | rsv->timer.data = (unsigned long)rsv; | |
476 | ||
477 | rsv->rc = rc; | |
5b37717a | 478 | INIT_WORK(&rsv->handle_timeout_work, uwb_rsv_handle_timeout_work); |
8cc13a09 DV |
479 | |
480 | return rsv; | |
481 | } | |
482 | ||
8cc13a09 DV |
483 | /** |
484 | * uwb_rsv_create - allocate and initialize a UWB reservation structure | |
485 | * @rc: the radio controller | |
486 | * @cb: callback to use when the reservation completes or terminates | |
487 | * @pal_priv: data private to the PAL to be passed in the callback | |
488 | * | |
489 | * The callback is called when the state of the reservation changes from: | |
490 | * | |
491 | * - pending to accepted | |
492 | * - pending to denined | |
493 | * - accepted to terminated | |
494 | * - pending to terminated | |
495 | */ | |
496 | struct uwb_rsv *uwb_rsv_create(struct uwb_rc *rc, uwb_rsv_cb_f cb, void *pal_priv) | |
497 | { | |
498 | struct uwb_rsv *rsv; | |
499 | ||
500 | rsv = uwb_rsv_alloc(rc); | |
501 | if (!rsv) | |
502 | return NULL; | |
503 | ||
504 | rsv->callback = cb; | |
505 | rsv->pal_priv = pal_priv; | |
506 | ||
507 | return rsv; | |
508 | } | |
509 | EXPORT_SYMBOL_GPL(uwb_rsv_create); | |
510 | ||
511 | void uwb_rsv_remove(struct uwb_rsv *rsv) | |
512 | { | |
5b37717a SP |
513 | uwb_rsv_dump("RM", rsv); |
514 | ||
8cc13a09 DV |
515 | if (rsv->state != UWB_RSV_STATE_NONE) |
516 | uwb_rsv_set_state(rsv, UWB_RSV_STATE_NONE); | |
5b37717a SP |
517 | |
518 | if (rsv->needs_release_companion_mas) | |
519 | uwb_drp_avail_release(rsv->rc, &rsv->mv.companion_mas); | |
520 | uwb_drp_avail_release(rsv->rc, &rsv->mas); | |
521 | ||
522 | if (uwb_rsv_is_owner(rsv)) | |
523 | uwb_rsv_put_stream(rsv); | |
2226b1c2 | 524 | |
cae1c114 DV |
525 | uwb_dev_put(rsv->owner); |
526 | if (rsv->target.type == UWB_RSV_TARGET_DEV) | |
527 | uwb_dev_put(rsv->target.dev); | |
528 | ||
529 | list_del_init(&rsv->rc_node); | |
530 | uwb_rsv_put(rsv); | |
8cc13a09 DV |
531 | } |
532 | ||
533 | /** | |
534 | * uwb_rsv_destroy - free a UWB reservation structure | |
535 | * @rsv: the reservation to free | |
536 | * | |
cae1c114 | 537 | * The reservation must already be terminated. |
8cc13a09 DV |
538 | */ |
539 | void uwb_rsv_destroy(struct uwb_rsv *rsv) | |
540 | { | |
cae1c114 | 541 | uwb_rsv_put(rsv); |
8cc13a09 DV |
542 | } |
543 | EXPORT_SYMBOL_GPL(uwb_rsv_destroy); | |
544 | ||
545 | /** | |
546 | * usb_rsv_establish - start a reservation establishment | |
547 | * @rsv: the reservation | |
548 | * | |
549 | * The PAL should fill in @rsv's owner, target, type, max_mas, | |
5b37717a | 550 | * min_mas, max_interval and is_multicast fields. If the target is a |
8cc13a09 DV |
551 | * uwb_dev it must be referenced. |
552 | * | |
553 | * The reservation's callback will be called when the reservation is | |
554 | * accepted, denied or times out. | |
555 | */ | |
556 | int uwb_rsv_establish(struct uwb_rsv *rsv) | |
557 | { | |
558 | struct uwb_rc *rc = rsv->rc; | |
5b37717a | 559 | struct uwb_mas_bm available; |
7b360ee0 | 560 | struct device *dev = &rc->uwb_dev.dev; |
8cc13a09 DV |
561 | int ret; |
562 | ||
563 | mutex_lock(&rc->rsvs_mutex); | |
8cc13a09 | 564 | ret = uwb_rsv_get_stream(rsv); |
7b360ee0 TP |
565 | if (ret) { |
566 | dev_err(dev, "%s: uwb_rsv_get_stream failed: %d\n", | |
567 | __func__, ret); | |
8cc13a09 | 568 | goto out; |
7b360ee0 | 569 | } |
8cc13a09 | 570 | |
78782023 | 571 | rsv->tiebreaker = prandom_u32() & 1; |
5b37717a SP |
572 | /* get available mas bitmap */ |
573 | uwb_drp_available(rc, &available); | |
574 | ||
575 | ret = uwb_rsv_find_best_allocation(rsv, &available, &rsv->mas); | |
576 | if (ret == UWB_RSV_ALLOC_NOT_FOUND) { | |
577 | ret = -EBUSY; | |
578 | uwb_rsv_put_stream(rsv); | |
7b360ee0 TP |
579 | dev_err(dev, "%s: uwb_rsv_find_best_allocation failed: %d\n", |
580 | __func__, ret); | |
5b37717a SP |
581 | goto out; |
582 | } | |
583 | ||
584 | ret = uwb_drp_avail_reserve_pending(rc, &rsv->mas); | |
585 | if (ret != 0) { | |
8cc13a09 | 586 | uwb_rsv_put_stream(rsv); |
7b360ee0 TP |
587 | dev_err(dev, "%s: uwb_drp_avail_reserve_pending failed: %d\n", |
588 | __func__, ret); | |
8cc13a09 DV |
589 | goto out; |
590 | } | |
591 | ||
cae1c114 | 592 | uwb_rsv_get(rsv); |
8cc13a09 DV |
593 | list_add_tail(&rsv->rc_node, &rc->reservations); |
594 | rsv->owner = &rc->uwb_dev; | |
595 | uwb_dev_get(rsv->owner); | |
596 | uwb_rsv_set_state(rsv, UWB_RSV_STATE_O_INITIATED); | |
597 | out: | |
598 | mutex_unlock(&rc->rsvs_mutex); | |
599 | return ret; | |
600 | } | |
601 | EXPORT_SYMBOL_GPL(uwb_rsv_establish); | |
602 | ||
603 | /** | |
604 | * uwb_rsv_modify - modify an already established reservation | |
605 | * @rsv: the reservation to modify | |
606 | * @max_mas: new maximum MAS to reserve | |
607 | * @min_mas: new minimum MAS to reserve | |
5b37717a | 608 | * @max_interval: new max_interval to use |
8cc13a09 DV |
609 | * |
610 | * FIXME: implement this once there are PALs that use it. | |
611 | */ | |
5b37717a | 612 | int uwb_rsv_modify(struct uwb_rsv *rsv, int max_mas, int min_mas, int max_interval) |
8cc13a09 DV |
613 | { |
614 | return -ENOSYS; | |
615 | } | |
616 | EXPORT_SYMBOL_GPL(uwb_rsv_modify); | |
617 | ||
5b37717a SP |
618 | /* |
619 | * move an already established reservation (rc->rsvs_mutex must to be | |
620 | * taken when tis function is called) | |
621 | */ | |
622 | int uwb_rsv_try_move(struct uwb_rsv *rsv, struct uwb_mas_bm *available) | |
623 | { | |
624 | struct uwb_rc *rc = rsv->rc; | |
625 | struct uwb_drp_backoff_win *bow = &rc->bow; | |
626 | struct device *dev = &rc->uwb_dev.dev; | |
627 | struct uwb_rsv_move *mv; | |
628 | int ret = 0; | |
67d0fb25 | 629 | |
5b37717a SP |
630 | if (bow->can_reserve_extra_mases == false) |
631 | return -EBUSY; | |
632 | ||
633 | mv = &rsv->mv; | |
634 | ||
635 | if (uwb_rsv_find_best_allocation(rsv, available, &mv->final_mas) == UWB_RSV_ALLOC_FOUND) { | |
636 | ||
637 | if (!bitmap_equal(rsv->mas.bm, mv->final_mas.bm, UWB_NUM_MAS)) { | |
638 | /* We want to move the reservation */ | |
639 | bitmap_andnot(mv->companion_mas.bm, mv->final_mas.bm, rsv->mas.bm, UWB_NUM_MAS); | |
640 | uwb_drp_avail_reserve_pending(rc, &mv->companion_mas); | |
641 | uwb_rsv_set_state(rsv, UWB_RSV_STATE_O_MOVE_EXPANDING); | |
642 | } | |
643 | } else { | |
644 | dev_dbg(dev, "new allocation not found\n"); | |
645 | } | |
67d0fb25 | 646 | |
5b37717a SP |
647 | return ret; |
648 | } | |
649 | ||
650 | /* It will try to move every reservation in state O_ESTABLISHED giving | |
651 | * to the MAS allocator algorithm an availability that is the real one | |
652 | * plus the allocation already established from the reservation. */ | |
653 | void uwb_rsv_handle_drp_avail_change(struct uwb_rc *rc) | |
654 | { | |
655 | struct uwb_drp_backoff_win *bow = &rc->bow; | |
656 | struct uwb_rsv *rsv; | |
657 | struct uwb_mas_bm mas; | |
67d0fb25 | 658 | |
5b37717a SP |
659 | if (bow->can_reserve_extra_mases == false) |
660 | return; | |
661 | ||
662 | list_for_each_entry(rsv, &rc->reservations, rc_node) { | |
663 | if (rsv->state == UWB_RSV_STATE_O_ESTABLISHED || | |
664 | rsv->state == UWB_RSV_STATE_O_TO_BE_MOVED) { | |
665 | uwb_drp_available(rc, &mas); | |
666 | bitmap_or(mas.bm, mas.bm, rsv->mas.bm, UWB_NUM_MAS); | |
667 | uwb_rsv_try_move(rsv, &mas); | |
668 | } | |
669 | } | |
67d0fb25 | 670 | |
5b37717a SP |
671 | } |
672 | ||
8cc13a09 DV |
673 | /** |
674 | * uwb_rsv_terminate - terminate an established reservation | |
675 | * @rsv: the reservation to terminate | |
676 | * | |
677 | * A reservation is terminated by removing the DRP IE from the beacon, | |
678 | * the other end will consider the reservation to be terminated when | |
679 | * it does not see the DRP IE for at least mMaxLostBeacons. | |
680 | * | |
681 | * If applicable, the reference to the target uwb_dev will be released. | |
682 | */ | |
683 | void uwb_rsv_terminate(struct uwb_rsv *rsv) | |
684 | { | |
685 | struct uwb_rc *rc = rsv->rc; | |
686 | ||
687 | mutex_lock(&rc->rsvs_mutex); | |
688 | ||
671e470e DV |
689 | if (rsv->state != UWB_RSV_STATE_NONE) |
690 | uwb_rsv_set_state(rsv, UWB_RSV_STATE_NONE); | |
8cc13a09 DV |
691 | |
692 | mutex_unlock(&rc->rsvs_mutex); | |
693 | } | |
694 | EXPORT_SYMBOL_GPL(uwb_rsv_terminate); | |
695 | ||
696 | /** | |
697 | * uwb_rsv_accept - accept a new reservation from a peer | |
698 | * @rsv: the reservation | |
699 | * @cb: call back for reservation changes | |
700 | * @pal_priv: data to be passed in the above call back | |
701 | * | |
702 | * Reservation requests from peers are denied unless a PAL accepts it | |
703 | * by calling this function. | |
cae1c114 DV |
704 | * |
705 | * The PAL call uwb_rsv_destroy() for all accepted reservations before | |
706 | * calling uwb_pal_unregister(). | |
8cc13a09 DV |
707 | */ |
708 | void uwb_rsv_accept(struct uwb_rsv *rsv, uwb_rsv_cb_f cb, void *pal_priv) | |
709 | { | |
cae1c114 DV |
710 | uwb_rsv_get(rsv); |
711 | ||
8cc13a09 DV |
712 | rsv->callback = cb; |
713 | rsv->pal_priv = pal_priv; | |
714 | rsv->state = UWB_RSV_STATE_T_ACCEPTED; | |
715 | } | |
716 | EXPORT_SYMBOL_GPL(uwb_rsv_accept); | |
717 | ||
718 | /* | |
719 | * Is a received DRP IE for this reservation? | |
720 | */ | |
721 | static bool uwb_rsv_match(struct uwb_rsv *rsv, struct uwb_dev *src, | |
722 | struct uwb_ie_drp *drp_ie) | |
723 | { | |
724 | struct uwb_dev_addr *rsv_src; | |
725 | int stream; | |
726 | ||
727 | stream = uwb_ie_drp_stream_index(drp_ie); | |
728 | ||
729 | if (rsv->stream != stream) | |
730 | return false; | |
731 | ||
732 | switch (rsv->target.type) { | |
733 | case UWB_RSV_TARGET_DEVADDR: | |
734 | return rsv->stream == stream; | |
735 | case UWB_RSV_TARGET_DEV: | |
736 | if (uwb_ie_drp_owner(drp_ie)) | |
737 | rsv_src = &rsv->owner->dev_addr; | |
738 | else | |
739 | rsv_src = &rsv->target.dev->dev_addr; | |
740 | return uwb_dev_addr_cmp(&src->dev_addr, rsv_src) == 0; | |
741 | } | |
742 | return false; | |
743 | } | |
744 | ||
745 | static struct uwb_rsv *uwb_rsv_new_target(struct uwb_rc *rc, | |
746 | struct uwb_dev *src, | |
747 | struct uwb_ie_drp *drp_ie) | |
748 | { | |
749 | struct uwb_rsv *rsv; | |
750 | struct uwb_pal *pal; | |
751 | enum uwb_rsv_state state; | |
752 | ||
753 | rsv = uwb_rsv_alloc(rc); | |
754 | if (!rsv) | |
755 | return NULL; | |
756 | ||
757 | rsv->rc = rc; | |
758 | rsv->owner = src; | |
759 | uwb_dev_get(rsv->owner); | |
760 | rsv->target.type = UWB_RSV_TARGET_DEV; | |
761 | rsv->target.dev = &rc->uwb_dev; | |
5b37717a | 762 | uwb_dev_get(&rc->uwb_dev); |
8cc13a09 DV |
763 | rsv->type = uwb_ie_drp_type(drp_ie); |
764 | rsv->stream = uwb_ie_drp_stream_index(drp_ie); | |
8cc13a09 DV |
765 | uwb_drp_ie_to_bm(&rsv->mas, drp_ie); |
766 | ||
767 | /* | |
768 | * See if any PALs are interested in this reservation. If not, | |
769 | * deny the request. | |
770 | */ | |
771 | rsv->state = UWB_RSV_STATE_T_DENIED; | |
6fae35f9 | 772 | mutex_lock(&rc->uwb_dev.mutex); |
8cc13a09 DV |
773 | list_for_each_entry(pal, &rc->pals, node) { |
774 | if (pal->new_rsv) | |
e17be2b2 | 775 | pal->new_rsv(pal, rsv); |
8cc13a09 DV |
776 | if (rsv->state == UWB_RSV_STATE_T_ACCEPTED) |
777 | break; | |
778 | } | |
6fae35f9 | 779 | mutex_unlock(&rc->uwb_dev.mutex); |
8cc13a09 DV |
780 | |
781 | list_add_tail(&rsv->rc_node, &rc->reservations); | |
782 | state = rsv->state; | |
783 | rsv->state = UWB_RSV_STATE_NONE; | |
5b37717a SP |
784 | |
785 | /* FIXME: do something sensible here */ | |
786 | if (state == UWB_RSV_STATE_T_ACCEPTED | |
787 | && uwb_drp_avail_reserve_pending(rc, &rsv->mas) == -EBUSY) { | |
788 | /* FIXME: do something sensible here */ | |
789 | } else { | |
790 | uwb_rsv_set_state(rsv, state); | |
791 | } | |
8cc13a09 DV |
792 | |
793 | return rsv; | |
794 | } | |
795 | ||
5b37717a SP |
796 | /** |
797 | * uwb_rsv_get_usable_mas - get the bitmap of the usable MAS of a reservations | |
798 | * @rsv: the reservation. | |
799 | * @mas: returns the available MAS. | |
800 | * | |
801 | * The usable MAS of a reservation may be less than the negotiated MAS | |
802 | * if alien BPs are present. | |
803 | */ | |
804 | void uwb_rsv_get_usable_mas(struct uwb_rsv *rsv, struct uwb_mas_bm *mas) | |
805 | { | |
806 | bitmap_zero(mas->bm, UWB_NUM_MAS); | |
807 | bitmap_andnot(mas->bm, rsv->mas.bm, rsv->rc->cnflt_alien_bitmap.bm, UWB_NUM_MAS); | |
808 | } | |
809 | EXPORT_SYMBOL_GPL(uwb_rsv_get_usable_mas); | |
810 | ||
8cc13a09 DV |
811 | /** |
812 | * uwb_rsv_find - find a reservation for a received DRP IE. | |
813 | * @rc: the radio controller | |
814 | * @src: source of the DRP IE | |
815 | * @drp_ie: the DRP IE | |
816 | * | |
817 | * If the reservation cannot be found and the DRP IE is from a peer | |
818 | * attempting to establish a new reservation, create a new reservation | |
819 | * and add it to the list. | |
820 | */ | |
821 | struct uwb_rsv *uwb_rsv_find(struct uwb_rc *rc, struct uwb_dev *src, | |
822 | struct uwb_ie_drp *drp_ie) | |
823 | { | |
824 | struct uwb_rsv *rsv; | |
825 | ||
826 | list_for_each_entry(rsv, &rc->reservations, rc_node) { | |
827 | if (uwb_rsv_match(rsv, src, drp_ie)) | |
828 | return rsv; | |
829 | } | |
830 | ||
831 | if (uwb_ie_drp_owner(drp_ie)) | |
832 | return uwb_rsv_new_target(rc, src, drp_ie); | |
833 | ||
834 | return NULL; | |
835 | } | |
836 | ||
837 | /* | |
838 | * Go through all the reservations and check for timeouts and (if | |
839 | * necessary) update their DRP IEs. | |
840 | * | |
841 | * FIXME: look at building the SET_DRP_IE command here rather than | |
842 | * having to rescan the list in uwb_rc_send_all_drp_ie(). | |
843 | */ | |
844 | static bool uwb_rsv_update_all(struct uwb_rc *rc) | |
845 | { | |
846 | struct uwb_rsv *rsv, *t; | |
847 | bool ie_updated = false; | |
848 | ||
849 | list_for_each_entry_safe(rsv, t, &rc->reservations, rc_node) { | |
8cc13a09 DV |
850 | if (!rsv->ie_valid) { |
851 | uwb_drp_ie_update(rsv); | |
852 | ie_updated = true; | |
853 | } | |
854 | } | |
855 | ||
856 | return ie_updated; | |
857 | } | |
858 | ||
5b37717a SP |
859 | void uwb_rsv_queue_update(struct uwb_rc *rc) |
860 | { | |
861 | unsigned long delay_us = UWB_MAS_LENGTH_US * UWB_MAS_PER_ZONE; | |
862 | ||
863 | queue_delayed_work(rc->rsv_workq, &rc->rsv_update_work, usecs_to_jiffies(delay_us)); | |
864 | } | |
865 | ||
866 | /** | |
867 | * uwb_rsv_sched_update - schedule an update of the DRP IEs | |
868 | * @rc: the radio controller. | |
869 | * | |
870 | * To improve performance and ensure correctness with [ECMA-368] the | |
871 | * number of SET-DRP-IE commands that are done are limited. | |
872 | * | |
873 | * DRP IEs update come from two sources: DRP events from the hardware | |
874 | * which all occur at the beginning of the superframe ('syncronous' | |
875 | * events) and reservation establishment/termination requests from | |
876 | * PALs or timers ('asynchronous' events). | |
877 | * | |
878 | * A delayed work ensures that all the synchronous events result in | |
879 | * one SET-DRP-IE command. | |
880 | * | |
881 | * Additional logic (the set_drp_ie_pending and rsv_updated_postponed | |
882 | * flags) will prevent an asynchrous event starting a SET-DRP-IE | |
883 | * command if one is currently awaiting a response. | |
884 | * | |
885 | * FIXME: this does leave a window where an asynchrous event can delay | |
886 | * the SET-DRP-IE for a synchronous event by one superframe. | |
887 | */ | |
8cc13a09 DV |
888 | void uwb_rsv_sched_update(struct uwb_rc *rc) |
889 | { | |
3138887b | 890 | spin_lock_irq(&rc->rsvs_lock); |
5b37717a SP |
891 | if (!delayed_work_pending(&rc->rsv_update_work)) { |
892 | if (rc->set_drp_ie_pending > 0) { | |
893 | rc->set_drp_ie_pending++; | |
894 | goto unlock; | |
895 | } | |
896 | uwb_rsv_queue_update(rc); | |
897 | } | |
898 | unlock: | |
3138887b | 899 | spin_unlock_irq(&rc->rsvs_lock); |
8cc13a09 DV |
900 | } |
901 | ||
902 | /* | |
903 | * Update DRP IEs and, if necessary, the DRP Availability IE and send | |
904 | * the updated IEs to the radio controller. | |
905 | */ | |
906 | static void uwb_rsv_update_work(struct work_struct *work) | |
907 | { | |
5b37717a SP |
908 | struct uwb_rc *rc = container_of(work, struct uwb_rc, |
909 | rsv_update_work.work); | |
8cc13a09 DV |
910 | bool ie_updated; |
911 | ||
912 | mutex_lock(&rc->rsvs_mutex); | |
913 | ||
914 | ie_updated = uwb_rsv_update_all(rc); | |
915 | ||
916 | if (!rc->drp_avail.ie_valid) { | |
917 | uwb_drp_avail_ie_update(rc); | |
918 | ie_updated = true; | |
919 | } | |
920 | ||
5b37717a | 921 | if (ie_updated && (rc->set_drp_ie_pending == 0)) |
8cc13a09 DV |
922 | uwb_rc_send_all_drp_ie(rc); |
923 | ||
924 | mutex_unlock(&rc->rsvs_mutex); | |
925 | } | |
926 | ||
5b37717a SP |
927 | static void uwb_rsv_alien_bp_work(struct work_struct *work) |
928 | { | |
929 | struct uwb_rc *rc = container_of(work, struct uwb_rc, | |
930 | rsv_alien_bp_work.work); | |
931 | struct uwb_rsv *rsv; | |
932 | ||
933 | mutex_lock(&rc->rsvs_mutex); | |
67d0fb25 | 934 | |
5b37717a SP |
935 | list_for_each_entry(rsv, &rc->reservations, rc_node) { |
936 | if (rsv->type != UWB_DRP_TYPE_ALIEN_BP) { | |
bf359dff | 937 | uwb_rsv_callback(rsv); |
5b37717a SP |
938 | } |
939 | } | |
940 | ||
941 | mutex_unlock(&rc->rsvs_mutex); | |
942 | } | |
943 | ||
8cc13a09 DV |
944 | static void uwb_rsv_timer(unsigned long arg) |
945 | { | |
946 | struct uwb_rsv *rsv = (struct uwb_rsv *)arg; | |
947 | ||
5b37717a | 948 | queue_work(rsv->rc->rsv_workq, &rsv->handle_timeout_work); |
8cc13a09 DV |
949 | } |
950 | ||
307ba6dd DV |
951 | /** |
952 | * uwb_rsv_remove_all - remove all reservations | |
953 | * @rc: the radio controller | |
954 | * | |
955 | * A DRP IE update is not done. | |
956 | */ | |
957 | void uwb_rsv_remove_all(struct uwb_rc *rc) | |
958 | { | |
959 | struct uwb_rsv *rsv, *t; | |
960 | ||
961 | mutex_lock(&rc->rsvs_mutex); | |
962 | list_for_each_entry_safe(rsv, t, &rc->reservations, rc_node) { | |
2226b1c2 DV |
963 | if (rsv->state != UWB_RSV_STATE_NONE) |
964 | uwb_rsv_set_state(rsv, UWB_RSV_STATE_NONE); | |
965 | del_timer_sync(&rsv->timer); | |
307ba6dd | 966 | } |
5b37717a SP |
967 | /* Cancel any postponed update. */ |
968 | rc->set_drp_ie_pending = 0; | |
307ba6dd DV |
969 | mutex_unlock(&rc->rsvs_mutex); |
970 | ||
5b37717a | 971 | cancel_delayed_work_sync(&rc->rsv_update_work); |
2226b1c2 DV |
972 | flush_workqueue(rc->rsv_workq); |
973 | ||
974 | mutex_lock(&rc->rsvs_mutex); | |
975 | list_for_each_entry_safe(rsv, t, &rc->reservations, rc_node) { | |
976 | uwb_rsv_remove(rsv); | |
977 | } | |
978 | mutex_unlock(&rc->rsvs_mutex); | |
307ba6dd DV |
979 | } |
980 | ||
8cc13a09 DV |
981 | void uwb_rsv_init(struct uwb_rc *rc) |
982 | { | |
983 | INIT_LIST_HEAD(&rc->reservations); | |
5b37717a | 984 | INIT_LIST_HEAD(&rc->cnflt_alien_list); |
8cc13a09 | 985 | mutex_init(&rc->rsvs_mutex); |
5b37717a SP |
986 | spin_lock_init(&rc->rsvs_lock); |
987 | INIT_DELAYED_WORK(&rc->rsv_update_work, uwb_rsv_update_work); | |
988 | INIT_DELAYED_WORK(&rc->rsv_alien_bp_work, uwb_rsv_alien_bp_work); | |
989 | rc->bow.can_reserve_extra_mases = true; | |
990 | rc->bow.total_expired = 0; | |
991 | rc->bow.window = UWB_DRP_BACKOFF_WIN_MIN >> 1; | |
992 | init_timer(&rc->bow.timer); | |
993 | rc->bow.timer.function = uwb_rsv_backoff_win_timer; | |
994 | rc->bow.timer.data = (unsigned long)&rc->bow; | |
8cc13a09 DV |
995 | |
996 | bitmap_complement(rc->uwb_dev.streams, rc->uwb_dev.streams, UWB_NUM_STREAMS); | |
997 | } | |
998 | ||
999 | int uwb_rsv_setup(struct uwb_rc *rc) | |
1000 | { | |
1001 | char name[16]; | |
1002 | ||
1003 | snprintf(name, sizeof(name), "%s_rsvd", dev_name(&rc->uwb_dev.dev)); | |
1004 | rc->rsv_workq = create_singlethread_workqueue(name); | |
1005 | if (rc->rsv_workq == NULL) | |
1006 | return -ENOMEM; | |
1007 | ||
1008 | return 0; | |
1009 | } | |
1010 | ||
1011 | void uwb_rsv_cleanup(struct uwb_rc *rc) | |
1012 | { | |
307ba6dd | 1013 | uwb_rsv_remove_all(rc); |
8cc13a09 DV |
1014 | destroy_workqueue(rc->rsv_workq); |
1015 | } |