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Commit | Line | Data |
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caab277b | 1 | // SPDX-License-Identifier: GPL-2.0-only |
8cc13a09 DV |
2 | /* |
3 | * UWB reservation management. | |
4 | * | |
5 | * Copyright (C) 2008 Cambridge Silicon Radio Ltd. | |
8cc13a09 | 6 | */ |
8cc13a09 DV |
7 | #include <linux/kernel.h> |
8 | #include <linux/uwb.h> | |
5a0e3ad6 | 9 | #include <linux/slab.h> |
5b37717a | 10 | #include <linux/random.h> |
475c0a6b | 11 | #include <linux/export.h> |
8cc13a09 DV |
12 | |
13 | #include "uwb-internal.h" | |
14 | ||
e99e88a9 | 15 | static void uwb_rsv_timer(struct timer_list *t); |
8cc13a09 DV |
16 | |
17 | static const char *rsv_states[] = { | |
5b37717a SP |
18 | [UWB_RSV_STATE_NONE] = "none ", |
19 | [UWB_RSV_STATE_O_INITIATED] = "o initiated ", | |
20 | [UWB_RSV_STATE_O_PENDING] = "o pending ", | |
21 | [UWB_RSV_STATE_O_MODIFIED] = "o modified ", | |
22 | [UWB_RSV_STATE_O_ESTABLISHED] = "o established ", | |
23 | [UWB_RSV_STATE_O_TO_BE_MOVED] = "o to be moved ", | |
24 | [UWB_RSV_STATE_O_MOVE_EXPANDING] = "o move expanding", | |
25 | [UWB_RSV_STATE_O_MOVE_COMBINING] = "o move combining", | |
26 | [UWB_RSV_STATE_O_MOVE_REDUCING] = "o move reducing ", | |
27 | [UWB_RSV_STATE_T_ACCEPTED] = "t accepted ", | |
28 | [UWB_RSV_STATE_T_CONFLICT] = "t conflict ", | |
29 | [UWB_RSV_STATE_T_PENDING] = "t pending ", | |
30 | [UWB_RSV_STATE_T_DENIED] = "t denied ", | |
31 | [UWB_RSV_STATE_T_RESIZED] = "t resized ", | |
32 | [UWB_RSV_STATE_T_EXPANDING_ACCEPTED] = "t expanding acc ", | |
33 | [UWB_RSV_STATE_T_EXPANDING_CONFLICT] = "t expanding conf", | |
34 | [UWB_RSV_STATE_T_EXPANDING_PENDING] = "t expanding pend", | |
35 | [UWB_RSV_STATE_T_EXPANDING_DENIED] = "t expanding den ", | |
8cc13a09 DV |
36 | }; |
37 | ||
38 | static const char *rsv_types[] = { | |
39 | [UWB_DRP_TYPE_ALIEN_BP] = "alien-bp", | |
40 | [UWB_DRP_TYPE_HARD] = "hard", | |
41 | [UWB_DRP_TYPE_SOFT] = "soft", | |
42 | [UWB_DRP_TYPE_PRIVATE] = "private", | |
43 | [UWB_DRP_TYPE_PCA] = "pca", | |
44 | }; | |
45 | ||
5b37717a SP |
46 | bool uwb_rsv_has_two_drp_ies(struct uwb_rsv *rsv) |
47 | { | |
48 | static const bool has_two_drp_ies[] = { | |
49 | [UWB_RSV_STATE_O_INITIATED] = false, | |
50 | [UWB_RSV_STATE_O_PENDING] = false, | |
51 | [UWB_RSV_STATE_O_MODIFIED] = false, | |
52 | [UWB_RSV_STATE_O_ESTABLISHED] = false, | |
53 | [UWB_RSV_STATE_O_TO_BE_MOVED] = false, | |
54 | [UWB_RSV_STATE_O_MOVE_COMBINING] = false, | |
55 | [UWB_RSV_STATE_O_MOVE_REDUCING] = false, | |
56 | [UWB_RSV_STATE_O_MOVE_EXPANDING] = true, | |
57 | [UWB_RSV_STATE_T_ACCEPTED] = false, | |
58 | [UWB_RSV_STATE_T_CONFLICT] = false, | |
59 | [UWB_RSV_STATE_T_PENDING] = false, | |
60 | [UWB_RSV_STATE_T_DENIED] = false, | |
61 | [UWB_RSV_STATE_T_RESIZED] = false, | |
62 | [UWB_RSV_STATE_T_EXPANDING_ACCEPTED] = true, | |
63 | [UWB_RSV_STATE_T_EXPANDING_CONFLICT] = true, | |
64 | [UWB_RSV_STATE_T_EXPANDING_PENDING] = true, | |
65 | [UWB_RSV_STATE_T_EXPANDING_DENIED] = true, | |
66 | }; | |
67 | ||
68 | return has_two_drp_ies[rsv->state]; | |
69 | } | |
70 | ||
8cc13a09 DV |
71 | /** |
72 | * uwb_rsv_state_str - return a string for a reservation state | |
73 | * @state: the reservation state. | |
74 | */ | |
75 | const char *uwb_rsv_state_str(enum uwb_rsv_state state) | |
76 | { | |
77 | if (state < UWB_RSV_STATE_NONE || state >= UWB_RSV_STATE_LAST) | |
78 | return "unknown"; | |
79 | return rsv_states[state]; | |
80 | } | |
81 | EXPORT_SYMBOL_GPL(uwb_rsv_state_str); | |
82 | ||
83 | /** | |
84 | * uwb_rsv_type_str - return a string for a reservation type | |
85 | * @type: the reservation type | |
86 | */ | |
87 | const char *uwb_rsv_type_str(enum uwb_drp_type type) | |
88 | { | |
89 | if (type < UWB_DRP_TYPE_ALIEN_BP || type > UWB_DRP_TYPE_PCA) | |
90 | return "invalid"; | |
91 | return rsv_types[type]; | |
92 | } | |
93 | EXPORT_SYMBOL_GPL(uwb_rsv_type_str); | |
94 | ||
5b37717a | 95 | void uwb_rsv_dump(char *text, struct uwb_rsv *rsv) |
8cc13a09 DV |
96 | { |
97 | struct device *dev = &rsv->rc->uwb_dev.dev; | |
98 | struct uwb_dev_addr devaddr; | |
99 | char owner[UWB_ADDR_STRSIZE], target[UWB_ADDR_STRSIZE]; | |
100 | ||
101 | uwb_dev_addr_print(owner, sizeof(owner), &rsv->owner->dev_addr); | |
102 | if (rsv->target.type == UWB_RSV_TARGET_DEV) | |
103 | devaddr = rsv->target.dev->dev_addr; | |
104 | else | |
105 | devaddr = rsv->target.devaddr; | |
106 | uwb_dev_addr_print(target, sizeof(target), &devaddr); | |
107 | ||
2226b1c2 DV |
108 | dev_dbg(dev, "rsv %s %s -> %s: %s\n", |
109 | text, owner, target, uwb_rsv_state_str(rsv->state)); | |
8cc13a09 DV |
110 | } |
111 | ||
cae1c114 DV |
112 | static void uwb_rsv_release(struct kref *kref) |
113 | { | |
114 | struct uwb_rsv *rsv = container_of(kref, struct uwb_rsv, kref); | |
115 | ||
116 | kfree(rsv); | |
117 | } | |
118 | ||
5b37717a | 119 | void uwb_rsv_get(struct uwb_rsv *rsv) |
cae1c114 DV |
120 | { |
121 | kref_get(&rsv->kref); | |
122 | } | |
123 | ||
5b37717a | 124 | void uwb_rsv_put(struct uwb_rsv *rsv) |
cae1c114 DV |
125 | { |
126 | kref_put(&rsv->kref, uwb_rsv_release); | |
127 | } | |
128 | ||
8cc13a09 DV |
129 | /* |
130 | * Get a free stream index for a reservation. | |
131 | * | |
132 | * If the target is a DevAddr (e.g., a WUSB cluster reservation) then | |
133 | * the stream is allocated from a pool of per-RC stream indexes, | |
134 | * otherwise a unique stream index for the target is selected. | |
135 | */ | |
136 | static int uwb_rsv_get_stream(struct uwb_rsv *rsv) | |
137 | { | |
138 | struct uwb_rc *rc = rsv->rc; | |
5b37717a | 139 | struct device *dev = &rc->uwb_dev.dev; |
8cc13a09 DV |
140 | unsigned long *streams_bm; |
141 | int stream; | |
142 | ||
143 | switch (rsv->target.type) { | |
144 | case UWB_RSV_TARGET_DEV: | |
145 | streams_bm = rsv->target.dev->streams; | |
146 | break; | |
147 | case UWB_RSV_TARGET_DEVADDR: | |
148 | streams_bm = rc->uwb_dev.streams; | |
149 | break; | |
150 | default: | |
151 | return -EINVAL; | |
152 | } | |
153 | ||
154 | stream = find_first_zero_bit(streams_bm, UWB_NUM_STREAMS); | |
7b360ee0 TP |
155 | if (stream >= UWB_NUM_STREAMS) { |
156 | dev_err(dev, "%s: no available stream found\n", __func__); | |
8cc13a09 | 157 | return -EBUSY; |
7b360ee0 | 158 | } |
8cc13a09 DV |
159 | |
160 | rsv->stream = stream; | |
161 | set_bit(stream, streams_bm); | |
162 | ||
5b37717a SP |
163 | dev_dbg(dev, "get stream %d\n", rsv->stream); |
164 | ||
8cc13a09 DV |
165 | return 0; |
166 | } | |
167 | ||
168 | static void uwb_rsv_put_stream(struct uwb_rsv *rsv) | |
169 | { | |
170 | struct uwb_rc *rc = rsv->rc; | |
5b37717a | 171 | struct device *dev = &rc->uwb_dev.dev; |
8cc13a09 DV |
172 | unsigned long *streams_bm; |
173 | ||
174 | switch (rsv->target.type) { | |
175 | case UWB_RSV_TARGET_DEV: | |
176 | streams_bm = rsv->target.dev->streams; | |
177 | break; | |
178 | case UWB_RSV_TARGET_DEVADDR: | |
179 | streams_bm = rc->uwb_dev.streams; | |
180 | break; | |
181 | default: | |
182 | return; | |
183 | } | |
184 | ||
185 | clear_bit(rsv->stream, streams_bm); | |
5b37717a SP |
186 | |
187 | dev_dbg(dev, "put stream %d\n", rsv->stream); | |
8cc13a09 DV |
188 | } |
189 | ||
e99e88a9 | 190 | void uwb_rsv_backoff_win_timer(struct timer_list *t) |
8cc13a09 | 191 | { |
e99e88a9 | 192 | struct uwb_drp_backoff_win *bow = from_timer(bow, t, timer); |
5b37717a SP |
193 | struct uwb_rc *rc = container_of(bow, struct uwb_rc, bow); |
194 | struct device *dev = &rc->uwb_dev.dev; | |
8cc13a09 | 195 | |
5b37717a SP |
196 | bow->can_reserve_extra_mases = true; |
197 | if (bow->total_expired <= 4) { | |
198 | bow->total_expired++; | |
199 | } else { | |
200 | /* after 4 backoff window has expired we can exit from | |
201 | * the backoff procedure */ | |
202 | bow->total_expired = 0; | |
203 | bow->window = UWB_DRP_BACKOFF_WIN_MIN >> 1; | |
8cc13a09 | 204 | } |
d9c3ae28 | 205 | dev_dbg(dev, "backoff_win_timer total_expired=%d, n=%d\n", bow->total_expired, bow->n); |
5b37717a SP |
206 | |
207 | /* try to relocate all the "to be moved" relocations */ | |
208 | uwb_rsv_handle_drp_avail_change(rc); | |
8cc13a09 DV |
209 | } |
210 | ||
5b37717a | 211 | void uwb_rsv_backoff_win_increment(struct uwb_rc *rc) |
8cc13a09 | 212 | { |
5b37717a SP |
213 | struct uwb_drp_backoff_win *bow = &rc->bow; |
214 | struct device *dev = &rc->uwb_dev.dev; | |
215 | unsigned timeout_us; | |
8cc13a09 | 216 | |
5b37717a | 217 | dev_dbg(dev, "backoff_win_increment: window=%d\n", bow->window); |
8cc13a09 | 218 | |
5b37717a | 219 | bow->can_reserve_extra_mases = false; |
8cc13a09 | 220 | |
5b37717a SP |
221 | if((bow->window << 1) == UWB_DRP_BACKOFF_WIN_MAX) |
222 | return; | |
8cc13a09 | 223 | |
5b37717a | 224 | bow->window <<= 1; |
78782023 | 225 | bow->n = prandom_u32() & (bow->window - 1); |
d9c3ae28 | 226 | dev_dbg(dev, "new_window=%d, n=%d\n", bow->window, bow->n); |
8cc13a09 | 227 | |
5b37717a SP |
228 | /* reset the timer associated variables */ |
229 | timeout_us = bow->n * UWB_SUPERFRAME_LENGTH_US; | |
230 | bow->total_expired = 0; | |
67d0fb25 | 231 | mod_timer(&bow->timer, jiffies + usecs_to_jiffies(timeout_us)); |
8cc13a09 DV |
232 | } |
233 | ||
234 | static void uwb_rsv_stroke_timer(struct uwb_rsv *rsv) | |
235 | { | |
236 | int sframes = UWB_MAX_LOST_BEACONS; | |
237 | ||
238 | /* | |
239 | * Multicast reservations can become established within 1 | |
240 | * super frame and should not be terminated if no response is | |
241 | * received. | |
242 | */ | |
90ec00d5 TP |
243 | if (rsv->state == UWB_RSV_STATE_NONE) { |
244 | sframes = 0; | |
245 | } else if (rsv->is_multicast) { | |
5b37717a SP |
246 | if (rsv->state == UWB_RSV_STATE_O_INITIATED |
247 | || rsv->state == UWB_RSV_STATE_O_MOVE_EXPANDING | |
248 | || rsv->state == UWB_RSV_STATE_O_MOVE_COMBINING | |
249 | || rsv->state == UWB_RSV_STATE_O_MOVE_REDUCING) | |
8cc13a09 DV |
250 | sframes = 1; |
251 | if (rsv->state == UWB_RSV_STATE_O_ESTABLISHED) | |
252 | sframes = 0; | |
67d0fb25 | 253 | |
8cc13a09 DV |
254 | } |
255 | ||
8cc13a09 DV |
256 | if (sframes > 0) { |
257 | /* | |
258 | * Add an additional 2 superframes to account for the | |
259 | * time to send the SET DRP IE command. | |
260 | */ | |
261 | unsigned timeout_us = (sframes + 2) * UWB_SUPERFRAME_LENGTH_US; | |
262 | mod_timer(&rsv->timer, jiffies + usecs_to_jiffies(timeout_us)); | |
263 | } else | |
264 | del_timer(&rsv->timer); | |
265 | } | |
266 | ||
267 | /* | |
268 | * Update a reservations state, and schedule an update of the | |
269 | * transmitted DRP IEs. | |
270 | */ | |
271 | static void uwb_rsv_state_update(struct uwb_rsv *rsv, | |
272 | enum uwb_rsv_state new_state) | |
273 | { | |
274 | rsv->state = new_state; | |
275 | rsv->ie_valid = false; | |
276 | ||
5b37717a | 277 | uwb_rsv_dump("SU", rsv); |
8cc13a09 DV |
278 | |
279 | uwb_rsv_stroke_timer(rsv); | |
280 | uwb_rsv_sched_update(rsv->rc); | |
281 | } | |
282 | ||
283 | static void uwb_rsv_callback(struct uwb_rsv *rsv) | |
284 | { | |
285 | if (rsv->callback) | |
286 | rsv->callback(rsv); | |
287 | } | |
288 | ||
289 | void uwb_rsv_set_state(struct uwb_rsv *rsv, enum uwb_rsv_state new_state) | |
290 | { | |
5b37717a SP |
291 | struct uwb_rsv_move *mv = &rsv->mv; |
292 | ||
8cc13a09 DV |
293 | if (rsv->state == new_state) { |
294 | switch (rsv->state) { | |
295 | case UWB_RSV_STATE_O_ESTABLISHED: | |
5b37717a SP |
296 | case UWB_RSV_STATE_O_MOVE_EXPANDING: |
297 | case UWB_RSV_STATE_O_MOVE_COMBINING: | |
298 | case UWB_RSV_STATE_O_MOVE_REDUCING: | |
8cc13a09 | 299 | case UWB_RSV_STATE_T_ACCEPTED: |
5b37717a SP |
300 | case UWB_RSV_STATE_T_EXPANDING_ACCEPTED: |
301 | case UWB_RSV_STATE_T_RESIZED: | |
8cc13a09 DV |
302 | case UWB_RSV_STATE_NONE: |
303 | uwb_rsv_stroke_timer(rsv); | |
304 | break; | |
305 | default: | |
306 | /* Expecting a state transition so leave timer | |
307 | as-is. */ | |
308 | break; | |
309 | } | |
310 | return; | |
311 | } | |
312 | ||
5b37717a SP |
313 | uwb_rsv_dump("SC", rsv); |
314 | ||
8cc13a09 DV |
315 | switch (new_state) { |
316 | case UWB_RSV_STATE_NONE: | |
8cc13a09 | 317 | uwb_rsv_state_update(rsv, UWB_RSV_STATE_NONE); |
90ec00d5 | 318 | uwb_rsv_remove(rsv); |
8cc13a09 DV |
319 | uwb_rsv_callback(rsv); |
320 | break; | |
321 | case UWB_RSV_STATE_O_INITIATED: | |
322 | uwb_rsv_state_update(rsv, UWB_RSV_STATE_O_INITIATED); | |
323 | break; | |
324 | case UWB_RSV_STATE_O_PENDING: | |
325 | uwb_rsv_state_update(rsv, UWB_RSV_STATE_O_PENDING); | |
326 | break; | |
5b37717a SP |
327 | case UWB_RSV_STATE_O_MODIFIED: |
328 | /* in the companion there are the MASes to drop */ | |
329 | bitmap_andnot(rsv->mas.bm, rsv->mas.bm, mv->companion_mas.bm, UWB_NUM_MAS); | |
330 | uwb_rsv_state_update(rsv, UWB_RSV_STATE_O_MODIFIED); | |
331 | break; | |
8cc13a09 | 332 | case UWB_RSV_STATE_O_ESTABLISHED: |
5b37717a SP |
333 | if (rsv->state == UWB_RSV_STATE_O_MODIFIED |
334 | || rsv->state == UWB_RSV_STATE_O_MOVE_REDUCING) { | |
335 | uwb_drp_avail_release(rsv->rc, &mv->companion_mas); | |
336 | rsv->needs_release_companion_mas = false; | |
337 | } | |
8cc13a09 DV |
338 | uwb_drp_avail_reserve(rsv->rc, &rsv->mas); |
339 | uwb_rsv_state_update(rsv, UWB_RSV_STATE_O_ESTABLISHED); | |
340 | uwb_rsv_callback(rsv); | |
341 | break; | |
5b37717a SP |
342 | case UWB_RSV_STATE_O_MOVE_EXPANDING: |
343 | rsv->needs_release_companion_mas = true; | |
344 | uwb_rsv_state_update(rsv, UWB_RSV_STATE_O_MOVE_EXPANDING); | |
345 | break; | |
346 | case UWB_RSV_STATE_O_MOVE_COMBINING: | |
347 | rsv->needs_release_companion_mas = false; | |
348 | uwb_drp_avail_reserve(rsv->rc, &mv->companion_mas); | |
349 | bitmap_or(rsv->mas.bm, rsv->mas.bm, mv->companion_mas.bm, UWB_NUM_MAS); | |
350 | rsv->mas.safe += mv->companion_mas.safe; | |
351 | rsv->mas.unsafe += mv->companion_mas.unsafe; | |
352 | uwb_rsv_state_update(rsv, UWB_RSV_STATE_O_MOVE_COMBINING); | |
353 | break; | |
354 | case UWB_RSV_STATE_O_MOVE_REDUCING: | |
355 | bitmap_andnot(mv->companion_mas.bm, rsv->mas.bm, mv->final_mas.bm, UWB_NUM_MAS); | |
356 | rsv->needs_release_companion_mas = true; | |
357 | rsv->mas.safe = mv->final_mas.safe; | |
358 | rsv->mas.unsafe = mv->final_mas.unsafe; | |
359 | bitmap_copy(rsv->mas.bm, mv->final_mas.bm, UWB_NUM_MAS); | |
360 | bitmap_copy(rsv->mas.unsafe_bm, mv->final_mas.unsafe_bm, UWB_NUM_MAS); | |
361 | uwb_rsv_state_update(rsv, UWB_RSV_STATE_O_MOVE_REDUCING); | |
362 | break; | |
8cc13a09 | 363 | case UWB_RSV_STATE_T_ACCEPTED: |
5b37717a SP |
364 | case UWB_RSV_STATE_T_RESIZED: |
365 | rsv->needs_release_companion_mas = false; | |
8cc13a09 DV |
366 | uwb_drp_avail_reserve(rsv->rc, &rsv->mas); |
367 | uwb_rsv_state_update(rsv, UWB_RSV_STATE_T_ACCEPTED); | |
368 | uwb_rsv_callback(rsv); | |
369 | break; | |
370 | case UWB_RSV_STATE_T_DENIED: | |
371 | uwb_rsv_state_update(rsv, UWB_RSV_STATE_T_DENIED); | |
372 | break; | |
5b37717a SP |
373 | case UWB_RSV_STATE_T_CONFLICT: |
374 | uwb_rsv_state_update(rsv, UWB_RSV_STATE_T_CONFLICT); | |
375 | break; | |
376 | case UWB_RSV_STATE_T_PENDING: | |
377 | uwb_rsv_state_update(rsv, UWB_RSV_STATE_T_PENDING); | |
378 | break; | |
379 | case UWB_RSV_STATE_T_EXPANDING_ACCEPTED: | |
380 | rsv->needs_release_companion_mas = true; | |
381 | uwb_drp_avail_reserve(rsv->rc, &mv->companion_mas); | |
382 | uwb_rsv_state_update(rsv, UWB_RSV_STATE_T_EXPANDING_ACCEPTED); | |
383 | break; | |
8cc13a09 DV |
384 | default: |
385 | dev_err(&rsv->rc->uwb_dev.dev, "unhandled state: %s (%d)\n", | |
386 | uwb_rsv_state_str(new_state), new_state); | |
387 | } | |
388 | } | |
389 | ||
5b37717a SP |
390 | static void uwb_rsv_handle_timeout_work(struct work_struct *work) |
391 | { | |
392 | struct uwb_rsv *rsv = container_of(work, struct uwb_rsv, | |
393 | handle_timeout_work); | |
394 | struct uwb_rc *rc = rsv->rc; | |
395 | ||
396 | mutex_lock(&rc->rsvs_mutex); | |
397 | ||
398 | uwb_rsv_dump("TO", rsv); | |
399 | ||
400 | switch (rsv->state) { | |
401 | case UWB_RSV_STATE_O_INITIATED: | |
402 | if (rsv->is_multicast) { | |
403 | uwb_rsv_set_state(rsv, UWB_RSV_STATE_O_ESTABLISHED); | |
404 | goto unlock; | |
405 | } | |
406 | break; | |
407 | case UWB_RSV_STATE_O_MOVE_EXPANDING: | |
408 | if (rsv->is_multicast) { | |
409 | uwb_rsv_set_state(rsv, UWB_RSV_STATE_O_MOVE_COMBINING); | |
410 | goto unlock; | |
411 | } | |
412 | break; | |
413 | case UWB_RSV_STATE_O_MOVE_COMBINING: | |
414 | if (rsv->is_multicast) { | |
415 | uwb_rsv_set_state(rsv, UWB_RSV_STATE_O_MOVE_REDUCING); | |
416 | goto unlock; | |
417 | } | |
418 | break; | |
419 | case UWB_RSV_STATE_O_MOVE_REDUCING: | |
420 | if (rsv->is_multicast) { | |
421 | uwb_rsv_set_state(rsv, UWB_RSV_STATE_O_ESTABLISHED); | |
422 | goto unlock; | |
423 | } | |
424 | break; | |
425 | case UWB_RSV_STATE_O_ESTABLISHED: | |
426 | if (rsv->is_multicast) | |
427 | goto unlock; | |
428 | break; | |
429 | case UWB_RSV_STATE_T_EXPANDING_ACCEPTED: | |
430 | /* | |
431 | * The time out could be for the main or of the | |
432 | * companion DRP, assume it's for the companion and | |
433 | * drop that first. A further time out is required to | |
434 | * drop the main. | |
435 | */ | |
436 | uwb_rsv_set_state(rsv, UWB_RSV_STATE_T_ACCEPTED); | |
437 | uwb_drp_avail_release(rsv->rc, &rsv->mv.companion_mas); | |
438 | goto unlock; | |
90ec00d5 TP |
439 | case UWB_RSV_STATE_NONE: |
440 | goto unlock; | |
5b37717a SP |
441 | default: |
442 | break; | |
443 | } | |
444 | ||
445 | uwb_rsv_remove(rsv); | |
446 | ||
447 | unlock: | |
448 | mutex_unlock(&rc->rsvs_mutex); | |
449 | } | |
450 | ||
8cc13a09 DV |
451 | static struct uwb_rsv *uwb_rsv_alloc(struct uwb_rc *rc) |
452 | { | |
453 | struct uwb_rsv *rsv; | |
454 | ||
455 | rsv = kzalloc(sizeof(struct uwb_rsv), GFP_KERNEL); | |
456 | if (!rsv) | |
457 | return NULL; | |
458 | ||
459 | INIT_LIST_HEAD(&rsv->rc_node); | |
460 | INIT_LIST_HEAD(&rsv->pal_node); | |
cae1c114 | 461 | kref_init(&rsv->kref); |
e99e88a9 | 462 | timer_setup(&rsv->timer, uwb_rsv_timer, 0); |
8cc13a09 DV |
463 | |
464 | rsv->rc = rc; | |
5b37717a | 465 | INIT_WORK(&rsv->handle_timeout_work, uwb_rsv_handle_timeout_work); |
8cc13a09 DV |
466 | |
467 | return rsv; | |
468 | } | |
469 | ||
8cc13a09 DV |
470 | /** |
471 | * uwb_rsv_create - allocate and initialize a UWB reservation structure | |
472 | * @rc: the radio controller | |
473 | * @cb: callback to use when the reservation completes or terminates | |
474 | * @pal_priv: data private to the PAL to be passed in the callback | |
475 | * | |
476 | * The callback is called when the state of the reservation changes from: | |
477 | * | |
478 | * - pending to accepted | |
479 | * - pending to denined | |
480 | * - accepted to terminated | |
481 | * - pending to terminated | |
482 | */ | |
483 | struct uwb_rsv *uwb_rsv_create(struct uwb_rc *rc, uwb_rsv_cb_f cb, void *pal_priv) | |
484 | { | |
485 | struct uwb_rsv *rsv; | |
486 | ||
487 | rsv = uwb_rsv_alloc(rc); | |
488 | if (!rsv) | |
489 | return NULL; | |
490 | ||
491 | rsv->callback = cb; | |
492 | rsv->pal_priv = pal_priv; | |
493 | ||
494 | return rsv; | |
495 | } | |
496 | EXPORT_SYMBOL_GPL(uwb_rsv_create); | |
497 | ||
498 | void uwb_rsv_remove(struct uwb_rsv *rsv) | |
499 | { | |
5b37717a SP |
500 | uwb_rsv_dump("RM", rsv); |
501 | ||
8cc13a09 DV |
502 | if (rsv->state != UWB_RSV_STATE_NONE) |
503 | uwb_rsv_set_state(rsv, UWB_RSV_STATE_NONE); | |
5b37717a SP |
504 | |
505 | if (rsv->needs_release_companion_mas) | |
506 | uwb_drp_avail_release(rsv->rc, &rsv->mv.companion_mas); | |
507 | uwb_drp_avail_release(rsv->rc, &rsv->mas); | |
508 | ||
509 | if (uwb_rsv_is_owner(rsv)) | |
510 | uwb_rsv_put_stream(rsv); | |
2226b1c2 | 511 | |
cae1c114 DV |
512 | uwb_dev_put(rsv->owner); |
513 | if (rsv->target.type == UWB_RSV_TARGET_DEV) | |
514 | uwb_dev_put(rsv->target.dev); | |
515 | ||
516 | list_del_init(&rsv->rc_node); | |
517 | uwb_rsv_put(rsv); | |
8cc13a09 DV |
518 | } |
519 | ||
520 | /** | |
521 | * uwb_rsv_destroy - free a UWB reservation structure | |
522 | * @rsv: the reservation to free | |
523 | * | |
cae1c114 | 524 | * The reservation must already be terminated. |
8cc13a09 DV |
525 | */ |
526 | void uwb_rsv_destroy(struct uwb_rsv *rsv) | |
527 | { | |
cae1c114 | 528 | uwb_rsv_put(rsv); |
8cc13a09 DV |
529 | } |
530 | EXPORT_SYMBOL_GPL(uwb_rsv_destroy); | |
531 | ||
532 | /** | |
533 | * usb_rsv_establish - start a reservation establishment | |
534 | * @rsv: the reservation | |
535 | * | |
536 | * The PAL should fill in @rsv's owner, target, type, max_mas, | |
5b37717a | 537 | * min_mas, max_interval and is_multicast fields. If the target is a |
8cc13a09 DV |
538 | * uwb_dev it must be referenced. |
539 | * | |
540 | * The reservation's callback will be called when the reservation is | |
541 | * accepted, denied or times out. | |
542 | */ | |
543 | int uwb_rsv_establish(struct uwb_rsv *rsv) | |
544 | { | |
545 | struct uwb_rc *rc = rsv->rc; | |
5b37717a | 546 | struct uwb_mas_bm available; |
7b360ee0 | 547 | struct device *dev = &rc->uwb_dev.dev; |
8cc13a09 DV |
548 | int ret; |
549 | ||
550 | mutex_lock(&rc->rsvs_mutex); | |
8cc13a09 | 551 | ret = uwb_rsv_get_stream(rsv); |
7b360ee0 TP |
552 | if (ret) { |
553 | dev_err(dev, "%s: uwb_rsv_get_stream failed: %d\n", | |
554 | __func__, ret); | |
8cc13a09 | 555 | goto out; |
7b360ee0 | 556 | } |
8cc13a09 | 557 | |
78782023 | 558 | rsv->tiebreaker = prandom_u32() & 1; |
5b37717a SP |
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); | |
7b360ee0 TP |
566 | dev_err(dev, "%s: uwb_rsv_find_best_allocation failed: %d\n", |
567 | __func__, ret); | |
5b37717a SP |
568 | goto out; |
569 | } | |
570 | ||
571 | ret = uwb_drp_avail_reserve_pending(rc, &rsv->mas); | |
572 | if (ret != 0) { | |
8cc13a09 | 573 | uwb_rsv_put_stream(rsv); |
7b360ee0 TP |
574 | dev_err(dev, "%s: uwb_drp_avail_reserve_pending failed: %d\n", |
575 | __func__, ret); | |
8cc13a09 DV |
576 | goto out; |
577 | } | |
578 | ||
cae1c114 | 579 | uwb_rsv_get(rsv); |
8cc13a09 DV |
580 | list_add_tail(&rsv->rc_node, &rc->reservations); |
581 | rsv->owner = &rc->uwb_dev; | |
582 | uwb_dev_get(rsv->owner); | |
583 | uwb_rsv_set_state(rsv, UWB_RSV_STATE_O_INITIATED); | |
584 | out: | |
585 | mutex_unlock(&rc->rsvs_mutex); | |
586 | return ret; | |
587 | } | |
588 | EXPORT_SYMBOL_GPL(uwb_rsv_establish); | |
589 | ||
590 | /** | |
591 | * uwb_rsv_modify - modify an already established reservation | |
592 | * @rsv: the reservation to modify | |
593 | * @max_mas: new maximum MAS to reserve | |
594 | * @min_mas: new minimum MAS to reserve | |
5b37717a | 595 | * @max_interval: new max_interval to use |
8cc13a09 DV |
596 | * |
597 | * FIXME: implement this once there are PALs that use it. | |
598 | */ | |
5b37717a | 599 | int uwb_rsv_modify(struct uwb_rsv *rsv, int max_mas, int min_mas, int max_interval) |
8cc13a09 DV |
600 | { |
601 | return -ENOSYS; | |
602 | } | |
603 | EXPORT_SYMBOL_GPL(uwb_rsv_modify); | |
604 | ||
5b37717a SP |
605 | /* |
606 | * move an already established reservation (rc->rsvs_mutex must to be | |
607 | * taken when tis function is called) | |
608 | */ | |
609 | int uwb_rsv_try_move(struct uwb_rsv *rsv, struct uwb_mas_bm *available) | |
610 | { | |
611 | struct uwb_rc *rc = rsv->rc; | |
612 | struct uwb_drp_backoff_win *bow = &rc->bow; | |
613 | struct device *dev = &rc->uwb_dev.dev; | |
614 | struct uwb_rsv_move *mv; | |
615 | int ret = 0; | |
67d0fb25 | 616 | |
5b37717a SP |
617 | if (bow->can_reserve_extra_mases == false) |
618 | return -EBUSY; | |
619 | ||
620 | mv = &rsv->mv; | |
621 | ||
622 | if (uwb_rsv_find_best_allocation(rsv, available, &mv->final_mas) == UWB_RSV_ALLOC_FOUND) { | |
623 | ||
624 | if (!bitmap_equal(rsv->mas.bm, mv->final_mas.bm, UWB_NUM_MAS)) { | |
625 | /* We want to move the reservation */ | |
626 | bitmap_andnot(mv->companion_mas.bm, mv->final_mas.bm, rsv->mas.bm, UWB_NUM_MAS); | |
627 | uwb_drp_avail_reserve_pending(rc, &mv->companion_mas); | |
628 | uwb_rsv_set_state(rsv, UWB_RSV_STATE_O_MOVE_EXPANDING); | |
629 | } | |
630 | } else { | |
631 | dev_dbg(dev, "new allocation not found\n"); | |
632 | } | |
67d0fb25 | 633 | |
5b37717a SP |
634 | return ret; |
635 | } | |
636 | ||
637 | /* It will try to move every reservation in state O_ESTABLISHED giving | |
638 | * to the MAS allocator algorithm an availability that is the real one | |
639 | * plus the allocation already established from the reservation. */ | |
640 | void uwb_rsv_handle_drp_avail_change(struct uwb_rc *rc) | |
641 | { | |
642 | struct uwb_drp_backoff_win *bow = &rc->bow; | |
643 | struct uwb_rsv *rsv; | |
644 | struct uwb_mas_bm mas; | |
67d0fb25 | 645 | |
5b37717a SP |
646 | if (bow->can_reserve_extra_mases == false) |
647 | return; | |
648 | ||
649 | list_for_each_entry(rsv, &rc->reservations, rc_node) { | |
650 | if (rsv->state == UWB_RSV_STATE_O_ESTABLISHED || | |
651 | rsv->state == UWB_RSV_STATE_O_TO_BE_MOVED) { | |
652 | uwb_drp_available(rc, &mas); | |
653 | bitmap_or(mas.bm, mas.bm, rsv->mas.bm, UWB_NUM_MAS); | |
654 | uwb_rsv_try_move(rsv, &mas); | |
655 | } | |
656 | } | |
67d0fb25 | 657 | |
5b37717a SP |
658 | } |
659 | ||
8cc13a09 DV |
660 | /** |
661 | * uwb_rsv_terminate - terminate an established reservation | |
662 | * @rsv: the reservation to terminate | |
663 | * | |
664 | * A reservation is terminated by removing the DRP IE from the beacon, | |
665 | * the other end will consider the reservation to be terminated when | |
666 | * it does not see the DRP IE for at least mMaxLostBeacons. | |
667 | * | |
668 | * If applicable, the reference to the target uwb_dev will be released. | |
669 | */ | |
670 | void uwb_rsv_terminate(struct uwb_rsv *rsv) | |
671 | { | |
672 | struct uwb_rc *rc = rsv->rc; | |
673 | ||
674 | mutex_lock(&rc->rsvs_mutex); | |
675 | ||
671e470e DV |
676 | if (rsv->state != UWB_RSV_STATE_NONE) |
677 | uwb_rsv_set_state(rsv, UWB_RSV_STATE_NONE); | |
8cc13a09 DV |
678 | |
679 | mutex_unlock(&rc->rsvs_mutex); | |
680 | } | |
681 | EXPORT_SYMBOL_GPL(uwb_rsv_terminate); | |
682 | ||
683 | /** | |
684 | * uwb_rsv_accept - accept a new reservation from a peer | |
685 | * @rsv: the reservation | |
686 | * @cb: call back for reservation changes | |
687 | * @pal_priv: data to be passed in the above call back | |
688 | * | |
689 | * Reservation requests from peers are denied unless a PAL accepts it | |
690 | * by calling this function. | |
cae1c114 DV |
691 | * |
692 | * The PAL call uwb_rsv_destroy() for all accepted reservations before | |
693 | * calling uwb_pal_unregister(). | |
8cc13a09 DV |
694 | */ |
695 | void uwb_rsv_accept(struct uwb_rsv *rsv, uwb_rsv_cb_f cb, void *pal_priv) | |
696 | { | |
cae1c114 DV |
697 | uwb_rsv_get(rsv); |
698 | ||
8cc13a09 DV |
699 | rsv->callback = cb; |
700 | rsv->pal_priv = pal_priv; | |
701 | rsv->state = UWB_RSV_STATE_T_ACCEPTED; | |
702 | } | |
703 | EXPORT_SYMBOL_GPL(uwb_rsv_accept); | |
704 | ||
705 | /* | |
706 | * Is a received DRP IE for this reservation? | |
707 | */ | |
708 | static bool uwb_rsv_match(struct uwb_rsv *rsv, struct uwb_dev *src, | |
709 | struct uwb_ie_drp *drp_ie) | |
710 | { | |
711 | struct uwb_dev_addr *rsv_src; | |
712 | int stream; | |
713 | ||
714 | stream = uwb_ie_drp_stream_index(drp_ie); | |
715 | ||
716 | if (rsv->stream != stream) | |
717 | return false; | |
718 | ||
719 | switch (rsv->target.type) { | |
720 | case UWB_RSV_TARGET_DEVADDR: | |
721 | return rsv->stream == stream; | |
722 | case UWB_RSV_TARGET_DEV: | |
723 | if (uwb_ie_drp_owner(drp_ie)) | |
724 | rsv_src = &rsv->owner->dev_addr; | |
725 | else | |
726 | rsv_src = &rsv->target.dev->dev_addr; | |
727 | return uwb_dev_addr_cmp(&src->dev_addr, rsv_src) == 0; | |
728 | } | |
729 | return false; | |
730 | } | |
731 | ||
732 | static struct uwb_rsv *uwb_rsv_new_target(struct uwb_rc *rc, | |
733 | struct uwb_dev *src, | |
734 | struct uwb_ie_drp *drp_ie) | |
735 | { | |
736 | struct uwb_rsv *rsv; | |
737 | struct uwb_pal *pal; | |
738 | enum uwb_rsv_state state; | |
739 | ||
740 | rsv = uwb_rsv_alloc(rc); | |
741 | if (!rsv) | |
742 | return NULL; | |
743 | ||
744 | rsv->rc = rc; | |
745 | rsv->owner = src; | |
746 | uwb_dev_get(rsv->owner); | |
747 | rsv->target.type = UWB_RSV_TARGET_DEV; | |
748 | rsv->target.dev = &rc->uwb_dev; | |
5b37717a | 749 | uwb_dev_get(&rc->uwb_dev); |
8cc13a09 DV |
750 | rsv->type = uwb_ie_drp_type(drp_ie); |
751 | rsv->stream = uwb_ie_drp_stream_index(drp_ie); | |
8cc13a09 DV |
752 | uwb_drp_ie_to_bm(&rsv->mas, drp_ie); |
753 | ||
754 | /* | |
755 | * See if any PALs are interested in this reservation. If not, | |
756 | * deny the request. | |
757 | */ | |
758 | rsv->state = UWB_RSV_STATE_T_DENIED; | |
6fae35f9 | 759 | mutex_lock(&rc->uwb_dev.mutex); |
8cc13a09 DV |
760 | list_for_each_entry(pal, &rc->pals, node) { |
761 | if (pal->new_rsv) | |
e17be2b2 | 762 | pal->new_rsv(pal, rsv); |
8cc13a09 DV |
763 | if (rsv->state == UWB_RSV_STATE_T_ACCEPTED) |
764 | break; | |
765 | } | |
6fae35f9 | 766 | mutex_unlock(&rc->uwb_dev.mutex); |
8cc13a09 DV |
767 | |
768 | list_add_tail(&rsv->rc_node, &rc->reservations); | |
769 | state = rsv->state; | |
770 | rsv->state = UWB_RSV_STATE_NONE; | |
5b37717a SP |
771 | |
772 | /* FIXME: do something sensible here */ | |
773 | if (state == UWB_RSV_STATE_T_ACCEPTED | |
774 | && uwb_drp_avail_reserve_pending(rc, &rsv->mas) == -EBUSY) { | |
775 | /* FIXME: do something sensible here */ | |
776 | } else { | |
777 | uwb_rsv_set_state(rsv, state); | |
778 | } | |
8cc13a09 DV |
779 | |
780 | return rsv; | |
781 | } | |
782 | ||
5b37717a SP |
783 | /** |
784 | * uwb_rsv_get_usable_mas - get the bitmap of the usable MAS of a reservations | |
785 | * @rsv: the reservation. | |
786 | * @mas: returns the available MAS. | |
787 | * | |
788 | * The usable MAS of a reservation may be less than the negotiated MAS | |
789 | * if alien BPs are present. | |
790 | */ | |
791 | void uwb_rsv_get_usable_mas(struct uwb_rsv *rsv, struct uwb_mas_bm *mas) | |
792 | { | |
793 | bitmap_zero(mas->bm, UWB_NUM_MAS); | |
794 | bitmap_andnot(mas->bm, rsv->mas.bm, rsv->rc->cnflt_alien_bitmap.bm, UWB_NUM_MAS); | |
795 | } | |
796 | EXPORT_SYMBOL_GPL(uwb_rsv_get_usable_mas); | |
797 | ||
8cc13a09 DV |
798 | /** |
799 | * uwb_rsv_find - find a reservation for a received DRP IE. | |
800 | * @rc: the radio controller | |
801 | * @src: source of the DRP IE | |
802 | * @drp_ie: the DRP IE | |
803 | * | |
804 | * If the reservation cannot be found and the DRP IE is from a peer | |
805 | * attempting to establish a new reservation, create a new reservation | |
806 | * and add it to the list. | |
807 | */ | |
808 | struct uwb_rsv *uwb_rsv_find(struct uwb_rc *rc, struct uwb_dev *src, | |
809 | struct uwb_ie_drp *drp_ie) | |
810 | { | |
811 | struct uwb_rsv *rsv; | |
812 | ||
813 | list_for_each_entry(rsv, &rc->reservations, rc_node) { | |
814 | if (uwb_rsv_match(rsv, src, drp_ie)) | |
815 | return rsv; | |
816 | } | |
817 | ||
818 | if (uwb_ie_drp_owner(drp_ie)) | |
819 | return uwb_rsv_new_target(rc, src, drp_ie); | |
820 | ||
821 | return NULL; | |
822 | } | |
823 | ||
824 | /* | |
825 | * Go through all the reservations and check for timeouts and (if | |
826 | * necessary) update their DRP IEs. | |
827 | * | |
828 | * FIXME: look at building the SET_DRP_IE command here rather than | |
829 | * having to rescan the list in uwb_rc_send_all_drp_ie(). | |
830 | */ | |
831 | static bool uwb_rsv_update_all(struct uwb_rc *rc) | |
832 | { | |
833 | struct uwb_rsv *rsv, *t; | |
834 | bool ie_updated = false; | |
835 | ||
836 | list_for_each_entry_safe(rsv, t, &rc->reservations, rc_node) { | |
8cc13a09 DV |
837 | if (!rsv->ie_valid) { |
838 | uwb_drp_ie_update(rsv); | |
839 | ie_updated = true; | |
840 | } | |
841 | } | |
842 | ||
843 | return ie_updated; | |
844 | } | |
845 | ||
5b37717a SP |
846 | void uwb_rsv_queue_update(struct uwb_rc *rc) |
847 | { | |
848 | unsigned long delay_us = UWB_MAS_LENGTH_US * UWB_MAS_PER_ZONE; | |
849 | ||
850 | queue_delayed_work(rc->rsv_workq, &rc->rsv_update_work, usecs_to_jiffies(delay_us)); | |
851 | } | |
852 | ||
853 | /** | |
854 | * uwb_rsv_sched_update - schedule an update of the DRP IEs | |
855 | * @rc: the radio controller. | |
856 | * | |
857 | * To improve performance and ensure correctness with [ECMA-368] the | |
858 | * number of SET-DRP-IE commands that are done are limited. | |
859 | * | |
860 | * DRP IEs update come from two sources: DRP events from the hardware | |
861 | * which all occur at the beginning of the superframe ('syncronous' | |
862 | * events) and reservation establishment/termination requests from | |
863 | * PALs or timers ('asynchronous' events). | |
864 | * | |
865 | * A delayed work ensures that all the synchronous events result in | |
866 | * one SET-DRP-IE command. | |
867 | * | |
868 | * Additional logic (the set_drp_ie_pending and rsv_updated_postponed | |
869 | * flags) will prevent an asynchrous event starting a SET-DRP-IE | |
870 | * command if one is currently awaiting a response. | |
871 | * | |
872 | * FIXME: this does leave a window where an asynchrous event can delay | |
873 | * the SET-DRP-IE for a synchronous event by one superframe. | |
874 | */ | |
8cc13a09 DV |
875 | void uwb_rsv_sched_update(struct uwb_rc *rc) |
876 | { | |
3138887b | 877 | spin_lock_irq(&rc->rsvs_lock); |
5b37717a SP |
878 | if (!delayed_work_pending(&rc->rsv_update_work)) { |
879 | if (rc->set_drp_ie_pending > 0) { | |
880 | rc->set_drp_ie_pending++; | |
881 | goto unlock; | |
882 | } | |
883 | uwb_rsv_queue_update(rc); | |
884 | } | |
885 | unlock: | |
3138887b | 886 | spin_unlock_irq(&rc->rsvs_lock); |
8cc13a09 DV |
887 | } |
888 | ||
889 | /* | |
890 | * Update DRP IEs and, if necessary, the DRP Availability IE and send | |
891 | * the updated IEs to the radio controller. | |
892 | */ | |
893 | static void uwb_rsv_update_work(struct work_struct *work) | |
894 | { | |
5b37717a SP |
895 | struct uwb_rc *rc = container_of(work, struct uwb_rc, |
896 | rsv_update_work.work); | |
8cc13a09 DV |
897 | bool ie_updated; |
898 | ||
899 | mutex_lock(&rc->rsvs_mutex); | |
900 | ||
901 | ie_updated = uwb_rsv_update_all(rc); | |
902 | ||
903 | if (!rc->drp_avail.ie_valid) { | |
904 | uwb_drp_avail_ie_update(rc); | |
905 | ie_updated = true; | |
906 | } | |
907 | ||
5b37717a | 908 | if (ie_updated && (rc->set_drp_ie_pending == 0)) |
8cc13a09 DV |
909 | uwb_rc_send_all_drp_ie(rc); |
910 | ||
911 | mutex_unlock(&rc->rsvs_mutex); | |
912 | } | |
913 | ||
5b37717a SP |
914 | static void uwb_rsv_alien_bp_work(struct work_struct *work) |
915 | { | |
916 | struct uwb_rc *rc = container_of(work, struct uwb_rc, | |
917 | rsv_alien_bp_work.work); | |
918 | struct uwb_rsv *rsv; | |
919 | ||
920 | mutex_lock(&rc->rsvs_mutex); | |
67d0fb25 | 921 | |
5b37717a SP |
922 | list_for_each_entry(rsv, &rc->reservations, rc_node) { |
923 | if (rsv->type != UWB_DRP_TYPE_ALIEN_BP) { | |
bf359dff | 924 | uwb_rsv_callback(rsv); |
5b37717a SP |
925 | } |
926 | } | |
927 | ||
928 | mutex_unlock(&rc->rsvs_mutex); | |
929 | } | |
930 | ||
e99e88a9 | 931 | static void uwb_rsv_timer(struct timer_list *t) |
8cc13a09 | 932 | { |
e99e88a9 | 933 | struct uwb_rsv *rsv = from_timer(rsv, t, timer); |
8cc13a09 | 934 | |
5b37717a | 935 | queue_work(rsv->rc->rsv_workq, &rsv->handle_timeout_work); |
8cc13a09 DV |
936 | } |
937 | ||
307ba6dd DV |
938 | /** |
939 | * uwb_rsv_remove_all - remove all reservations | |
940 | * @rc: the radio controller | |
941 | * | |
942 | * A DRP IE update is not done. | |
943 | */ | |
944 | void uwb_rsv_remove_all(struct uwb_rc *rc) | |
945 | { | |
946 | struct uwb_rsv *rsv, *t; | |
947 | ||
948 | mutex_lock(&rc->rsvs_mutex); | |
949 | list_for_each_entry_safe(rsv, t, &rc->reservations, rc_node) { | |
2226b1c2 DV |
950 | if (rsv->state != UWB_RSV_STATE_NONE) |
951 | uwb_rsv_set_state(rsv, UWB_RSV_STATE_NONE); | |
952 | del_timer_sync(&rsv->timer); | |
307ba6dd | 953 | } |
5b37717a SP |
954 | /* Cancel any postponed update. */ |
955 | rc->set_drp_ie_pending = 0; | |
307ba6dd DV |
956 | mutex_unlock(&rc->rsvs_mutex); |
957 | ||
5b37717a | 958 | cancel_delayed_work_sync(&rc->rsv_update_work); |
2226b1c2 DV |
959 | flush_workqueue(rc->rsv_workq); |
960 | ||
961 | mutex_lock(&rc->rsvs_mutex); | |
962 | list_for_each_entry_safe(rsv, t, &rc->reservations, rc_node) { | |
963 | uwb_rsv_remove(rsv); | |
964 | } | |
965 | mutex_unlock(&rc->rsvs_mutex); | |
307ba6dd DV |
966 | } |
967 | ||
8cc13a09 DV |
968 | void uwb_rsv_init(struct uwb_rc *rc) |
969 | { | |
970 | INIT_LIST_HEAD(&rc->reservations); | |
5b37717a | 971 | INIT_LIST_HEAD(&rc->cnflt_alien_list); |
8cc13a09 | 972 | mutex_init(&rc->rsvs_mutex); |
5b37717a SP |
973 | spin_lock_init(&rc->rsvs_lock); |
974 | INIT_DELAYED_WORK(&rc->rsv_update_work, uwb_rsv_update_work); | |
975 | INIT_DELAYED_WORK(&rc->rsv_alien_bp_work, uwb_rsv_alien_bp_work); | |
976 | rc->bow.can_reserve_extra_mases = true; | |
977 | rc->bow.total_expired = 0; | |
978 | rc->bow.window = UWB_DRP_BACKOFF_WIN_MIN >> 1; | |
e99e88a9 | 979 | timer_setup(&rc->bow.timer, uwb_rsv_backoff_win_timer, 0); |
8cc13a09 DV |
980 | |
981 | bitmap_complement(rc->uwb_dev.streams, rc->uwb_dev.streams, UWB_NUM_STREAMS); | |
982 | } | |
983 | ||
984 | int uwb_rsv_setup(struct uwb_rc *rc) | |
985 | { | |
986 | char name[16]; | |
987 | ||
988 | snprintf(name, sizeof(name), "%s_rsvd", dev_name(&rc->uwb_dev.dev)); | |
989 | rc->rsv_workq = create_singlethread_workqueue(name); | |
990 | if (rc->rsv_workq == NULL) | |
991 | return -ENOMEM; | |
992 | ||
993 | return 0; | |
994 | } | |
995 | ||
996 | void uwb_rsv_cleanup(struct uwb_rc *rc) | |
997 | { | |
307ba6dd | 998 | uwb_rsv_remove_all(rc); |
8cc13a09 DV |
999 | destroy_workqueue(rc->rsv_workq); |
1000 | } |