1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * mac80211 - channel management
4 * Copyright 2020 - 2022 Intel Corporation
5 */
6
7 #include <linux/nl80211.h>
8 #include <linux/export.h>
9 #include <linux/rtnetlink.h>
10 #include <net/cfg80211.h>
11 #include "ieee80211_i.h"
12 #include "driver-ops.h"
13 #include "rate.h"
14
ieee80211_chanctx_num_assigned(struct ieee80211_local * local,struct ieee80211_chanctx * ctx)15 static int ieee80211_chanctx_num_assigned(struct ieee80211_local *local,
16 struct ieee80211_chanctx *ctx)
17 {
18 struct ieee80211_sub_if_data *sdata;
19 int num = 0;
20
21 lockdep_assert_held(&local->chanctx_mtx);
22
23 list_for_each_entry(sdata, &ctx->assigned_vifs, assigned_chanctx_list)
24 num++;
25
26 return num;
27 }
28
ieee80211_chanctx_num_reserved(struct ieee80211_local * local,struct ieee80211_chanctx * ctx)29 static int ieee80211_chanctx_num_reserved(struct ieee80211_local *local,
30 struct ieee80211_chanctx *ctx)
31 {
32 struct ieee80211_sub_if_data *sdata;
33 int num = 0;
34
35 lockdep_assert_held(&local->chanctx_mtx);
36
37 list_for_each_entry(sdata, &ctx->reserved_vifs, reserved_chanctx_list)
38 num++;
39
40 return num;
41 }
42
ieee80211_chanctx_refcount(struct ieee80211_local * local,struct ieee80211_chanctx * ctx)43 int ieee80211_chanctx_refcount(struct ieee80211_local *local,
44 struct ieee80211_chanctx *ctx)
45 {
46 return ieee80211_chanctx_num_assigned(local, ctx) +
47 ieee80211_chanctx_num_reserved(local, ctx);
48 }
49
ieee80211_num_chanctx(struct ieee80211_local * local)50 static int ieee80211_num_chanctx(struct ieee80211_local *local)
51 {
52 struct ieee80211_chanctx *ctx;
53 int num = 0;
54
55 lockdep_assert_held(&local->chanctx_mtx);
56
57 list_for_each_entry(ctx, &local->chanctx_list, list)
58 num++;
59
60 return num;
61 }
62
ieee80211_can_create_new_chanctx(struct ieee80211_local * local)63 static bool ieee80211_can_create_new_chanctx(struct ieee80211_local *local)
64 {
65 lockdep_assert_held(&local->chanctx_mtx);
66 return ieee80211_num_chanctx(local) < ieee80211_max_num_channels(local);
67 }
68
69 static struct ieee80211_chanctx *
ieee80211_vif_get_chanctx(struct ieee80211_sub_if_data * sdata)70 ieee80211_vif_get_chanctx(struct ieee80211_sub_if_data *sdata)
71 {
72 struct ieee80211_local *local __maybe_unused = sdata->local;
73 struct ieee80211_chanctx_conf *conf;
74
75 conf = rcu_dereference_protected(sdata->vif.bss_conf.chanctx_conf,
76 lockdep_is_held(&local->chanctx_mtx));
77 if (!conf)
78 return NULL;
79
80 return container_of(conf, struct ieee80211_chanctx, conf);
81 }
82
83 static const struct cfg80211_chan_def *
ieee80211_chanctx_reserved_chandef(struct ieee80211_local * local,struct ieee80211_chanctx * ctx,const struct cfg80211_chan_def * compat)84 ieee80211_chanctx_reserved_chandef(struct ieee80211_local *local,
85 struct ieee80211_chanctx *ctx,
86 const struct cfg80211_chan_def *compat)
87 {
88 struct ieee80211_sub_if_data *sdata;
89
90 lockdep_assert_held(&local->chanctx_mtx);
91
92 list_for_each_entry(sdata, &ctx->reserved_vifs,
93 reserved_chanctx_list) {
94 if (!compat)
95 compat = &sdata->reserved_chandef;
96
97 compat = cfg80211_chandef_compatible(&sdata->reserved_chandef,
98 compat);
99 if (!compat)
100 break;
101 }
102
103 return compat;
104 }
105
106 static const struct cfg80211_chan_def *
ieee80211_chanctx_non_reserved_chandef(struct ieee80211_local * local,struct ieee80211_chanctx * ctx,const struct cfg80211_chan_def * compat)107 ieee80211_chanctx_non_reserved_chandef(struct ieee80211_local *local,
108 struct ieee80211_chanctx *ctx,
109 const struct cfg80211_chan_def *compat)
110 {
111 struct ieee80211_sub_if_data *sdata;
112
113 lockdep_assert_held(&local->chanctx_mtx);
114
115 list_for_each_entry(sdata, &ctx->assigned_vifs,
116 assigned_chanctx_list) {
117 if (sdata->reserved_chanctx != NULL)
118 continue;
119
120 if (!compat)
121 compat = &sdata->vif.bss_conf.chandef;
122
123 compat = cfg80211_chandef_compatible(
124 &sdata->vif.bss_conf.chandef, compat);
125 if (!compat)
126 break;
127 }
128
129 return compat;
130 }
131
132 static const struct cfg80211_chan_def *
ieee80211_chanctx_combined_chandef(struct ieee80211_local * local,struct ieee80211_chanctx * ctx,const struct cfg80211_chan_def * compat)133 ieee80211_chanctx_combined_chandef(struct ieee80211_local *local,
134 struct ieee80211_chanctx *ctx,
135 const struct cfg80211_chan_def *compat)
136 {
137 lockdep_assert_held(&local->chanctx_mtx);
138
139 compat = ieee80211_chanctx_reserved_chandef(local, ctx, compat);
140 if (!compat)
141 return NULL;
142
143 compat = ieee80211_chanctx_non_reserved_chandef(local, ctx, compat);
144 if (!compat)
145 return NULL;
146
147 return compat;
148 }
149
150 static bool
ieee80211_chanctx_can_reserve_chandef(struct ieee80211_local * local,struct ieee80211_chanctx * ctx,const struct cfg80211_chan_def * def)151 ieee80211_chanctx_can_reserve_chandef(struct ieee80211_local *local,
152 struct ieee80211_chanctx *ctx,
153 const struct cfg80211_chan_def *def)
154 {
155 lockdep_assert_held(&local->chanctx_mtx);
156
157 if (ieee80211_chanctx_combined_chandef(local, ctx, def))
158 return true;
159
160 if (!list_empty(&ctx->reserved_vifs) &&
161 ieee80211_chanctx_reserved_chandef(local, ctx, def))
162 return true;
163
164 return false;
165 }
166
167 static struct ieee80211_chanctx *
ieee80211_find_reservation_chanctx(struct ieee80211_local * local,const struct cfg80211_chan_def * chandef,enum ieee80211_chanctx_mode mode)168 ieee80211_find_reservation_chanctx(struct ieee80211_local *local,
169 const struct cfg80211_chan_def *chandef,
170 enum ieee80211_chanctx_mode mode)
171 {
172 struct ieee80211_chanctx *ctx;
173
174 lockdep_assert_held(&local->chanctx_mtx);
175
176 if (mode == IEEE80211_CHANCTX_EXCLUSIVE)
177 return NULL;
178
179 list_for_each_entry(ctx, &local->chanctx_list, list) {
180 if (ctx->replace_state == IEEE80211_CHANCTX_WILL_BE_REPLACED)
181 continue;
182
183 if (ctx->mode == IEEE80211_CHANCTX_EXCLUSIVE)
184 continue;
185
186 if (!ieee80211_chanctx_can_reserve_chandef(local, ctx,
187 chandef))
188 continue;
189
190 return ctx;
191 }
192
193 return NULL;
194 }
195
ieee80211_get_sta_bw(struct sta_info * sta)196 static enum nl80211_chan_width ieee80211_get_sta_bw(struct sta_info *sta)
197 {
198 enum ieee80211_sta_rx_bandwidth width = ieee80211_sta_cap_rx_bw(sta);
199
200 switch (width) {
201 case IEEE80211_STA_RX_BW_20:
202 if (sta->sta.deflink.ht_cap.ht_supported)
203 return NL80211_CHAN_WIDTH_20;
204 else
205 return NL80211_CHAN_WIDTH_20_NOHT;
206 case IEEE80211_STA_RX_BW_40:
207 return NL80211_CHAN_WIDTH_40;
208 case IEEE80211_STA_RX_BW_80:
209 return NL80211_CHAN_WIDTH_80;
210 case IEEE80211_STA_RX_BW_160:
211 /*
212 * This applied for both 160 and 80+80. since we use
213 * the returned value to consider degradation of
214 * ctx->conf.min_def, we have to make sure to take
215 * the bigger one (NL80211_CHAN_WIDTH_160).
216 * Otherwise we might try degrading even when not
217 * needed, as the max required sta_bw returned (80+80)
218 * might be smaller than the configured bw (160).
219 */
220 return NL80211_CHAN_WIDTH_160;
221 case IEEE80211_STA_RX_BW_320:
222 return NL80211_CHAN_WIDTH_320;
223 default:
224 WARN_ON(1);
225 return NL80211_CHAN_WIDTH_20;
226 }
227 }
228
229 static enum nl80211_chan_width
ieee80211_get_max_required_bw(struct ieee80211_sub_if_data * sdata)230 ieee80211_get_max_required_bw(struct ieee80211_sub_if_data *sdata)
231 {
232 enum nl80211_chan_width max_bw = NL80211_CHAN_WIDTH_20_NOHT;
233 struct sta_info *sta;
234
235 rcu_read_lock();
236 list_for_each_entry_rcu(sta, &sdata->local->sta_list, list) {
237 if (sdata != sta->sdata &&
238 !(sta->sdata->bss && sta->sdata->bss == sdata->bss))
239 continue;
240
241 max_bw = max(max_bw, ieee80211_get_sta_bw(sta));
242 }
243 rcu_read_unlock();
244
245 return max_bw;
246 }
247
248 static enum nl80211_chan_width
ieee80211_get_chanctx_max_required_bw(struct ieee80211_local * local,struct ieee80211_chanctx_conf * conf)249 ieee80211_get_chanctx_max_required_bw(struct ieee80211_local *local,
250 struct ieee80211_chanctx_conf *conf)
251 {
252 struct ieee80211_sub_if_data *sdata;
253 enum nl80211_chan_width max_bw = NL80211_CHAN_WIDTH_20_NOHT;
254
255 rcu_read_lock();
256 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
257 struct ieee80211_vif *vif = &sdata->vif;
258 enum nl80211_chan_width width = NL80211_CHAN_WIDTH_20_NOHT;
259
260 if (!ieee80211_sdata_running(sdata))
261 continue;
262
263 if (rcu_access_pointer(sdata->vif.bss_conf.chanctx_conf) != conf)
264 continue;
265
266 switch (vif->type) {
267 case NL80211_IFTYPE_AP:
268 case NL80211_IFTYPE_AP_VLAN:
269 width = ieee80211_get_max_required_bw(sdata);
270 break;
271 case NL80211_IFTYPE_STATION:
272 /*
273 * The ap's sta->bandwidth is not set yet at this
274 * point, so take the width from the chandef, but
275 * account also for TDLS peers
276 */
277 width = max(vif->bss_conf.chandef.width,
278 ieee80211_get_max_required_bw(sdata));
279 break;
280 case NL80211_IFTYPE_P2P_DEVICE:
281 case NL80211_IFTYPE_NAN:
282 continue;
283 case NL80211_IFTYPE_ADHOC:
284 case NL80211_IFTYPE_MESH_POINT:
285 case NL80211_IFTYPE_OCB:
286 width = vif->bss_conf.chandef.width;
287 break;
288 case NL80211_IFTYPE_WDS:
289 case NL80211_IFTYPE_UNSPECIFIED:
290 case NUM_NL80211_IFTYPES:
291 case NL80211_IFTYPE_MONITOR:
292 case NL80211_IFTYPE_P2P_CLIENT:
293 case NL80211_IFTYPE_P2P_GO:
294 WARN_ON_ONCE(1);
295 }
296 max_bw = max(max_bw, width);
297 }
298
299 /* use the configured bandwidth in case of monitor interface */
300 sdata = rcu_dereference(local->monitor_sdata);
301 if (sdata && rcu_access_pointer(sdata->vif.bss_conf.chanctx_conf) == conf)
302 max_bw = max(max_bw, conf->def.width);
303
304 rcu_read_unlock();
305
306 return max_bw;
307 }
308
309 /*
310 * recalc the min required chan width of the channel context, which is
311 * the max of min required widths of all the interfaces bound to this
312 * channel context.
313 */
_ieee80211_recalc_chanctx_min_def(struct ieee80211_local * local,struct ieee80211_chanctx * ctx)314 static u32 _ieee80211_recalc_chanctx_min_def(struct ieee80211_local *local,
315 struct ieee80211_chanctx *ctx)
316 {
317 enum nl80211_chan_width max_bw;
318 struct cfg80211_chan_def min_def;
319
320 lockdep_assert_held(&local->chanctx_mtx);
321
322 /* don't optimize non-20MHz based and radar_enabled confs */
323 if (ctx->conf.def.width == NL80211_CHAN_WIDTH_5 ||
324 ctx->conf.def.width == NL80211_CHAN_WIDTH_10 ||
325 ctx->conf.def.width == NL80211_CHAN_WIDTH_1 ||
326 ctx->conf.def.width == NL80211_CHAN_WIDTH_2 ||
327 ctx->conf.def.width == NL80211_CHAN_WIDTH_4 ||
328 ctx->conf.def.width == NL80211_CHAN_WIDTH_8 ||
329 ctx->conf.def.width == NL80211_CHAN_WIDTH_16 ||
330 ctx->conf.radar_enabled) {
331 ctx->conf.min_def = ctx->conf.def;
332 return 0;
333 }
334
335 max_bw = ieee80211_get_chanctx_max_required_bw(local, &ctx->conf);
336
337 /* downgrade chandef up to max_bw */
338 min_def = ctx->conf.def;
339 while (min_def.width > max_bw)
340 ieee80211_chandef_downgrade(&min_def);
341
342 if (cfg80211_chandef_identical(&ctx->conf.min_def, &min_def))
343 return 0;
344
345 ctx->conf.min_def = min_def;
346 if (!ctx->driver_present)
347 return 0;
348
349 return IEEE80211_CHANCTX_CHANGE_MIN_WIDTH;
350 }
351
352 /* calling this function is assuming that station vif is updated to
353 * lates changes by calling ieee80211_vif_update_chandef
354 */
ieee80211_chan_bw_change(struct ieee80211_local * local,struct ieee80211_chanctx * ctx,bool narrowed)355 static void ieee80211_chan_bw_change(struct ieee80211_local *local,
356 struct ieee80211_chanctx *ctx,
357 bool narrowed)
358 {
359 struct sta_info *sta;
360 struct ieee80211_supported_band *sband =
361 local->hw.wiphy->bands[ctx->conf.def.chan->band];
362
363 rcu_read_lock();
364 list_for_each_entry_rcu(sta, &local->sta_list,
365 list) {
366 enum ieee80211_sta_rx_bandwidth new_sta_bw;
367
368 if (!ieee80211_sdata_running(sta->sdata))
369 continue;
370
371 if (rcu_access_pointer(sta->sdata->vif.bss_conf.chanctx_conf) !=
372 &ctx->conf)
373 continue;
374
375 new_sta_bw = ieee80211_sta_cur_vht_bw(sta);
376
377 /* nothing change */
378 if (new_sta_bw == sta->sta.deflink.bandwidth)
379 continue;
380
381 /* vif changed to narrow BW and narrow BW for station wasn't
382 * requested or vise versa */
383 if ((new_sta_bw < sta->sta.deflink.bandwidth) == !narrowed)
384 continue;
385
386 sta->sta.deflink.bandwidth = new_sta_bw;
387 rate_control_rate_update(local, sband, sta,
388 IEEE80211_RC_BW_CHANGED);
389 }
390 rcu_read_unlock();
391 }
392
393 /*
394 * recalc the min required chan width of the channel context, which is
395 * the max of min required widths of all the interfaces bound to this
396 * channel context.
397 */
ieee80211_recalc_chanctx_min_def(struct ieee80211_local * local,struct ieee80211_chanctx * ctx)398 void ieee80211_recalc_chanctx_min_def(struct ieee80211_local *local,
399 struct ieee80211_chanctx *ctx)
400 {
401 u32 changed = _ieee80211_recalc_chanctx_min_def(local, ctx);
402
403 if (!changed)
404 return;
405
406 /* check is BW narrowed */
407 ieee80211_chan_bw_change(local, ctx, true);
408
409 drv_change_chanctx(local, ctx, changed);
410
411 /* check is BW wider */
412 ieee80211_chan_bw_change(local, ctx, false);
413 }
414
ieee80211_change_chanctx(struct ieee80211_local * local,struct ieee80211_chanctx * ctx,struct ieee80211_chanctx * old_ctx,const struct cfg80211_chan_def * chandef)415 static void ieee80211_change_chanctx(struct ieee80211_local *local,
416 struct ieee80211_chanctx *ctx,
417 struct ieee80211_chanctx *old_ctx,
418 const struct cfg80211_chan_def *chandef)
419 {
420 u32 changed;
421
422 /* expected to handle only 20/40/80/160/320 channel widths */
423 switch (chandef->width) {
424 case NL80211_CHAN_WIDTH_20_NOHT:
425 case NL80211_CHAN_WIDTH_20:
426 case NL80211_CHAN_WIDTH_40:
427 case NL80211_CHAN_WIDTH_80:
428 case NL80211_CHAN_WIDTH_80P80:
429 case NL80211_CHAN_WIDTH_160:
430 case NL80211_CHAN_WIDTH_320:
431 break;
432 default:
433 WARN_ON(1);
434 }
435
436 /* Check maybe BW narrowed - we do this _before_ calling recalc_chanctx_min_def
437 * due to maybe not returning from it, e.g in case new context was added
438 * first time with all parameters up to date.
439 */
440 ieee80211_chan_bw_change(local, old_ctx, true);
441
442 if (cfg80211_chandef_identical(&ctx->conf.def, chandef)) {
443 ieee80211_recalc_chanctx_min_def(local, ctx);
444 return;
445 }
446
447 WARN_ON(!cfg80211_chandef_compatible(&ctx->conf.def, chandef));
448
449 ctx->conf.def = *chandef;
450
451 /* check if min chanctx also changed */
452 changed = IEEE80211_CHANCTX_CHANGE_WIDTH |
453 _ieee80211_recalc_chanctx_min_def(local, ctx);
454 drv_change_chanctx(local, ctx, changed);
455
456 if (!local->use_chanctx) {
457 local->_oper_chandef = *chandef;
458 ieee80211_hw_config(local, 0);
459 }
460
461 /* check is BW wider */
462 ieee80211_chan_bw_change(local, old_ctx, false);
463 }
464
465 static struct ieee80211_chanctx *
ieee80211_find_chanctx(struct ieee80211_local * local,const struct cfg80211_chan_def * chandef,enum ieee80211_chanctx_mode mode)466 ieee80211_find_chanctx(struct ieee80211_local *local,
467 const struct cfg80211_chan_def *chandef,
468 enum ieee80211_chanctx_mode mode)
469 {
470 struct ieee80211_chanctx *ctx;
471
472 lockdep_assert_held(&local->chanctx_mtx);
473
474 if (mode == IEEE80211_CHANCTX_EXCLUSIVE)
475 return NULL;
476
477 list_for_each_entry(ctx, &local->chanctx_list, list) {
478 const struct cfg80211_chan_def *compat;
479
480 if (ctx->replace_state != IEEE80211_CHANCTX_REPLACE_NONE)
481 continue;
482
483 if (ctx->mode == IEEE80211_CHANCTX_EXCLUSIVE)
484 continue;
485
486 compat = cfg80211_chandef_compatible(&ctx->conf.def, chandef);
487 if (!compat)
488 continue;
489
490 compat = ieee80211_chanctx_reserved_chandef(local, ctx,
491 compat);
492 if (!compat)
493 continue;
494
495 ieee80211_change_chanctx(local, ctx, ctx, compat);
496
497 return ctx;
498 }
499
500 return NULL;
501 }
502
ieee80211_is_radar_required(struct ieee80211_local * local)503 bool ieee80211_is_radar_required(struct ieee80211_local *local)
504 {
505 struct ieee80211_sub_if_data *sdata;
506
507 lockdep_assert_held(&local->mtx);
508
509 rcu_read_lock();
510 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
511 if (sdata->radar_required) {
512 rcu_read_unlock();
513 return true;
514 }
515 }
516 rcu_read_unlock();
517
518 return false;
519 }
520
521 static bool
ieee80211_chanctx_radar_required(struct ieee80211_local * local,struct ieee80211_chanctx * ctx)522 ieee80211_chanctx_radar_required(struct ieee80211_local *local,
523 struct ieee80211_chanctx *ctx)
524 {
525 struct ieee80211_chanctx_conf *conf = &ctx->conf;
526 struct ieee80211_sub_if_data *sdata;
527 bool required = false;
528
529 lockdep_assert_held(&local->chanctx_mtx);
530 lockdep_assert_held(&local->mtx);
531
532 rcu_read_lock();
533 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
534 if (!ieee80211_sdata_running(sdata))
535 continue;
536 if (rcu_access_pointer(sdata->vif.bss_conf.chanctx_conf) != conf)
537 continue;
538 if (!sdata->radar_required)
539 continue;
540
541 required = true;
542 break;
543 }
544 rcu_read_unlock();
545
546 return required;
547 }
548
549 static struct ieee80211_chanctx *
ieee80211_alloc_chanctx(struct ieee80211_local * local,const struct cfg80211_chan_def * chandef,enum ieee80211_chanctx_mode mode)550 ieee80211_alloc_chanctx(struct ieee80211_local *local,
551 const struct cfg80211_chan_def *chandef,
552 enum ieee80211_chanctx_mode mode)
553 {
554 struct ieee80211_chanctx *ctx;
555
556 lockdep_assert_held(&local->chanctx_mtx);
557
558 ctx = kzalloc(sizeof(*ctx) + local->hw.chanctx_data_size, GFP_KERNEL);
559 if (!ctx)
560 return NULL;
561
562 INIT_LIST_HEAD(&ctx->assigned_vifs);
563 INIT_LIST_HEAD(&ctx->reserved_vifs);
564 ctx->conf.def = *chandef;
565 ctx->conf.rx_chains_static = 1;
566 ctx->conf.rx_chains_dynamic = 1;
567 ctx->mode = mode;
568 ctx->conf.radar_enabled = false;
569 ieee80211_recalc_chanctx_min_def(local, ctx);
570
571 return ctx;
572 }
573
ieee80211_add_chanctx(struct ieee80211_local * local,struct ieee80211_chanctx * ctx)574 static int ieee80211_add_chanctx(struct ieee80211_local *local,
575 struct ieee80211_chanctx *ctx)
576 {
577 u32 changed;
578 int err;
579
580 lockdep_assert_held(&local->mtx);
581 lockdep_assert_held(&local->chanctx_mtx);
582
583 if (!local->use_chanctx)
584 local->hw.conf.radar_enabled = ctx->conf.radar_enabled;
585
586 /* turn idle off *before* setting channel -- some drivers need that */
587 changed = ieee80211_idle_off(local);
588 if (changed)
589 ieee80211_hw_config(local, changed);
590
591 if (!local->use_chanctx) {
592 local->_oper_chandef = ctx->conf.def;
593 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL);
594 } else {
595 err = drv_add_chanctx(local, ctx);
596 if (err) {
597 ieee80211_recalc_idle(local);
598 return err;
599 }
600 }
601
602 return 0;
603 }
604
605 static struct ieee80211_chanctx *
ieee80211_new_chanctx(struct ieee80211_local * local,const struct cfg80211_chan_def * chandef,enum ieee80211_chanctx_mode mode)606 ieee80211_new_chanctx(struct ieee80211_local *local,
607 const struct cfg80211_chan_def *chandef,
608 enum ieee80211_chanctx_mode mode)
609 {
610 struct ieee80211_chanctx *ctx;
611 int err;
612
613 lockdep_assert_held(&local->mtx);
614 lockdep_assert_held(&local->chanctx_mtx);
615
616 ctx = ieee80211_alloc_chanctx(local, chandef, mode);
617 if (!ctx)
618 return ERR_PTR(-ENOMEM);
619
620 err = ieee80211_add_chanctx(local, ctx);
621 if (err) {
622 kfree(ctx);
623 return ERR_PTR(err);
624 }
625
626 list_add_rcu(&ctx->list, &local->chanctx_list);
627 return ctx;
628 }
629
ieee80211_del_chanctx(struct ieee80211_local * local,struct ieee80211_chanctx * ctx)630 static void ieee80211_del_chanctx(struct ieee80211_local *local,
631 struct ieee80211_chanctx *ctx)
632 {
633 lockdep_assert_held(&local->chanctx_mtx);
634
635 if (!local->use_chanctx) {
636 struct cfg80211_chan_def *chandef = &local->_oper_chandef;
637 /* S1G doesn't have 20MHz, so get the correct width for the
638 * current channel.
639 */
640 if (chandef->chan->band == NL80211_BAND_S1GHZ)
641 chandef->width =
642 ieee80211_s1g_channel_width(chandef->chan);
643 else
644 chandef->width = NL80211_CHAN_WIDTH_20_NOHT;
645 chandef->center_freq1 = chandef->chan->center_freq;
646 chandef->freq1_offset = chandef->chan->freq_offset;
647 chandef->center_freq2 = 0;
648
649 /* NOTE: Disabling radar is only valid here for
650 * single channel context. To be sure, check it ...
651 */
652 WARN_ON(local->hw.conf.radar_enabled &&
653 !list_empty(&local->chanctx_list));
654
655 local->hw.conf.radar_enabled = false;
656
657 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL);
658 } else {
659 drv_remove_chanctx(local, ctx);
660 }
661
662 ieee80211_recalc_idle(local);
663 }
664
ieee80211_free_chanctx(struct ieee80211_local * local,struct ieee80211_chanctx * ctx)665 static void ieee80211_free_chanctx(struct ieee80211_local *local,
666 struct ieee80211_chanctx *ctx)
667 {
668 lockdep_assert_held(&local->chanctx_mtx);
669
670 WARN_ON_ONCE(ieee80211_chanctx_refcount(local, ctx) != 0);
671
672 list_del_rcu(&ctx->list);
673 ieee80211_del_chanctx(local, ctx);
674 kfree_rcu(ctx, rcu_head);
675 }
676
ieee80211_recalc_chanctx_chantype(struct ieee80211_local * local,struct ieee80211_chanctx * ctx)677 void ieee80211_recalc_chanctx_chantype(struct ieee80211_local *local,
678 struct ieee80211_chanctx *ctx)
679 {
680 struct ieee80211_chanctx_conf *conf = &ctx->conf;
681 struct ieee80211_sub_if_data *sdata;
682 const struct cfg80211_chan_def *compat = NULL;
683 struct sta_info *sta;
684
685 lockdep_assert_held(&local->chanctx_mtx);
686
687 rcu_read_lock();
688 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
689
690 if (!ieee80211_sdata_running(sdata))
691 continue;
692 if (rcu_access_pointer(sdata->vif.bss_conf.chanctx_conf) != conf)
693 continue;
694 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
695 continue;
696
697 if (!compat)
698 compat = &sdata->vif.bss_conf.chandef;
699
700 compat = cfg80211_chandef_compatible(
701 &sdata->vif.bss_conf.chandef, compat);
702 if (WARN_ON_ONCE(!compat))
703 break;
704 }
705
706 /* TDLS peers can sometimes affect the chandef width */
707 list_for_each_entry_rcu(sta, &local->sta_list, list) {
708 if (!sta->uploaded ||
709 !test_sta_flag(sta, WLAN_STA_TDLS_WIDER_BW) ||
710 !test_sta_flag(sta, WLAN_STA_AUTHORIZED) ||
711 !sta->tdls_chandef.chan)
712 continue;
713
714 compat = cfg80211_chandef_compatible(&sta->tdls_chandef,
715 compat);
716 if (WARN_ON_ONCE(!compat))
717 break;
718 }
719 rcu_read_unlock();
720
721 if (!compat)
722 return;
723
724 ieee80211_change_chanctx(local, ctx, ctx, compat);
725 }
726
ieee80211_recalc_radar_chanctx(struct ieee80211_local * local,struct ieee80211_chanctx * chanctx)727 static void ieee80211_recalc_radar_chanctx(struct ieee80211_local *local,
728 struct ieee80211_chanctx *chanctx)
729 {
730 bool radar_enabled;
731
732 lockdep_assert_held(&local->chanctx_mtx);
733 /* for ieee80211_is_radar_required */
734 lockdep_assert_held(&local->mtx);
735
736 radar_enabled = ieee80211_chanctx_radar_required(local, chanctx);
737
738 if (radar_enabled == chanctx->conf.radar_enabled)
739 return;
740
741 chanctx->conf.radar_enabled = radar_enabled;
742
743 if (!local->use_chanctx) {
744 local->hw.conf.radar_enabled = chanctx->conf.radar_enabled;
745 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL);
746 }
747
748 drv_change_chanctx(local, chanctx, IEEE80211_CHANCTX_CHANGE_RADAR);
749 }
750
ieee80211_assign_vif_chanctx(struct ieee80211_sub_if_data * sdata,struct ieee80211_chanctx * new_ctx)751 static int ieee80211_assign_vif_chanctx(struct ieee80211_sub_if_data *sdata,
752 struct ieee80211_chanctx *new_ctx)
753 {
754 struct ieee80211_local *local = sdata->local;
755 struct ieee80211_chanctx_conf *conf;
756 struct ieee80211_chanctx *curr_ctx = NULL;
757 int ret = 0;
758
759 if (WARN_ON(sdata->vif.type == NL80211_IFTYPE_NAN))
760 return -ENOTSUPP;
761
762 conf = rcu_dereference_protected(sdata->vif.bss_conf.chanctx_conf,
763 lockdep_is_held(&local->chanctx_mtx));
764
765 if (conf) {
766 curr_ctx = container_of(conf, struct ieee80211_chanctx, conf);
767
768 drv_unassign_vif_chanctx(local, sdata, curr_ctx);
769 conf = NULL;
770 list_del(&sdata->assigned_chanctx_list);
771 }
772
773 if (new_ctx) {
774 ret = drv_assign_vif_chanctx(local, sdata, new_ctx);
775 if (ret)
776 goto out;
777
778 conf = &new_ctx->conf;
779 list_add(&sdata->assigned_chanctx_list,
780 &new_ctx->assigned_vifs);
781 }
782
783 out:
784 rcu_assign_pointer(sdata->vif.bss_conf.chanctx_conf, conf);
785
786 sdata->vif.bss_conf.idle = !conf;
787
788 if (curr_ctx && ieee80211_chanctx_num_assigned(local, curr_ctx) > 0) {
789 ieee80211_recalc_chanctx_chantype(local, curr_ctx);
790 ieee80211_recalc_smps_chanctx(local, curr_ctx);
791 ieee80211_recalc_radar_chanctx(local, curr_ctx);
792 ieee80211_recalc_chanctx_min_def(local, curr_ctx);
793 }
794
795 if (new_ctx && ieee80211_chanctx_num_assigned(local, new_ctx) > 0) {
796 ieee80211_recalc_txpower(sdata, false);
797 ieee80211_recalc_chanctx_min_def(local, new_ctx);
798 }
799
800 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE &&
801 sdata->vif.type != NL80211_IFTYPE_MONITOR)
802 ieee80211_bss_info_change_notify(sdata,
803 BSS_CHANGED_IDLE);
804
805 ieee80211_check_fast_xmit_iface(sdata);
806
807 return ret;
808 }
809
ieee80211_recalc_smps_chanctx(struct ieee80211_local * local,struct ieee80211_chanctx * chanctx)810 void ieee80211_recalc_smps_chanctx(struct ieee80211_local *local,
811 struct ieee80211_chanctx *chanctx)
812 {
813 struct ieee80211_sub_if_data *sdata;
814 u8 rx_chains_static, rx_chains_dynamic;
815
816 lockdep_assert_held(&local->chanctx_mtx);
817
818 rx_chains_static = 1;
819 rx_chains_dynamic = 1;
820
821 rcu_read_lock();
822 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
823 u8 needed_static, needed_dynamic;
824
825 if (!ieee80211_sdata_running(sdata))
826 continue;
827
828 if (rcu_access_pointer(sdata->vif.bss_conf.chanctx_conf) !=
829 &chanctx->conf)
830 continue;
831
832 switch (sdata->vif.type) {
833 case NL80211_IFTYPE_P2P_DEVICE:
834 case NL80211_IFTYPE_NAN:
835 continue;
836 case NL80211_IFTYPE_STATION:
837 if (!sdata->u.mgd.associated)
838 continue;
839 break;
840 case NL80211_IFTYPE_AP_VLAN:
841 continue;
842 case NL80211_IFTYPE_AP:
843 case NL80211_IFTYPE_ADHOC:
844 case NL80211_IFTYPE_MESH_POINT:
845 case NL80211_IFTYPE_OCB:
846 break;
847 default:
848 WARN_ON_ONCE(1);
849 }
850
851 switch (sdata->smps_mode) {
852 default:
853 WARN_ONCE(1, "Invalid SMPS mode %d\n",
854 sdata->smps_mode);
855 fallthrough;
856 case IEEE80211_SMPS_OFF:
857 needed_static = sdata->needed_rx_chains;
858 needed_dynamic = sdata->needed_rx_chains;
859 break;
860 case IEEE80211_SMPS_DYNAMIC:
861 needed_static = 1;
862 needed_dynamic = sdata->needed_rx_chains;
863 break;
864 case IEEE80211_SMPS_STATIC:
865 needed_static = 1;
866 needed_dynamic = 1;
867 break;
868 }
869
870 rx_chains_static = max(rx_chains_static, needed_static);
871 rx_chains_dynamic = max(rx_chains_dynamic, needed_dynamic);
872 }
873
874 /* Disable SMPS for the monitor interface */
875 sdata = rcu_dereference(local->monitor_sdata);
876 if (sdata &&
877 rcu_access_pointer(sdata->vif.bss_conf.chanctx_conf) == &chanctx->conf)
878 rx_chains_dynamic = rx_chains_static = local->rx_chains;
879
880 rcu_read_unlock();
881
882 if (!local->use_chanctx) {
883 if (rx_chains_static > 1)
884 local->smps_mode = IEEE80211_SMPS_OFF;
885 else if (rx_chains_dynamic > 1)
886 local->smps_mode = IEEE80211_SMPS_DYNAMIC;
887 else
888 local->smps_mode = IEEE80211_SMPS_STATIC;
889 ieee80211_hw_config(local, 0);
890 }
891
892 if (rx_chains_static == chanctx->conf.rx_chains_static &&
893 rx_chains_dynamic == chanctx->conf.rx_chains_dynamic)
894 return;
895
896 chanctx->conf.rx_chains_static = rx_chains_static;
897 chanctx->conf.rx_chains_dynamic = rx_chains_dynamic;
898 drv_change_chanctx(local, chanctx, IEEE80211_CHANCTX_CHANGE_RX_CHAINS);
899 }
900
901 static void
__ieee80211_vif_copy_chanctx_to_vlans(struct ieee80211_sub_if_data * sdata,bool clear)902 __ieee80211_vif_copy_chanctx_to_vlans(struct ieee80211_sub_if_data *sdata,
903 bool clear)
904 {
905 struct ieee80211_local *local __maybe_unused = sdata->local;
906 struct ieee80211_sub_if_data *vlan;
907 struct ieee80211_chanctx_conf *conf;
908
909 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_AP))
910 return;
911
912 lockdep_assert_held(&local->mtx);
913
914 /* Check that conf exists, even when clearing this function
915 * must be called with the AP's channel context still there
916 * as it would otherwise cause VLANs to have an invalid
917 * channel context pointer for a while, possibly pointing
918 * to a channel context that has already been freed.
919 */
920 conf = rcu_dereference_protected(sdata->vif.bss_conf.chanctx_conf,
921 lockdep_is_held(&local->chanctx_mtx));
922 WARN_ON(!conf);
923
924 if (clear)
925 conf = NULL;
926
927 list_for_each_entry(vlan, &sdata->u.ap.vlans, u.vlan.list)
928 rcu_assign_pointer(vlan->vif.bss_conf.chanctx_conf, conf);
929 }
930
ieee80211_vif_copy_chanctx_to_vlans(struct ieee80211_sub_if_data * sdata,bool clear)931 void ieee80211_vif_copy_chanctx_to_vlans(struct ieee80211_sub_if_data *sdata,
932 bool clear)
933 {
934 struct ieee80211_local *local = sdata->local;
935
936 mutex_lock(&local->chanctx_mtx);
937
938 __ieee80211_vif_copy_chanctx_to_vlans(sdata, clear);
939
940 mutex_unlock(&local->chanctx_mtx);
941 }
942
ieee80211_vif_unreserve_chanctx(struct ieee80211_sub_if_data * sdata)943 int ieee80211_vif_unreserve_chanctx(struct ieee80211_sub_if_data *sdata)
944 {
945 struct ieee80211_chanctx *ctx = sdata->reserved_chanctx;
946
947 lockdep_assert_held(&sdata->local->chanctx_mtx);
948
949 if (WARN_ON(!ctx))
950 return -EINVAL;
951
952 list_del(&sdata->reserved_chanctx_list);
953 sdata->reserved_chanctx = NULL;
954
955 if (ieee80211_chanctx_refcount(sdata->local, ctx) == 0) {
956 if (ctx->replace_state == IEEE80211_CHANCTX_REPLACES_OTHER) {
957 if (WARN_ON(!ctx->replace_ctx))
958 return -EINVAL;
959
960 WARN_ON(ctx->replace_ctx->replace_state !=
961 IEEE80211_CHANCTX_WILL_BE_REPLACED);
962 WARN_ON(ctx->replace_ctx->replace_ctx != ctx);
963
964 ctx->replace_ctx->replace_ctx = NULL;
965 ctx->replace_ctx->replace_state =
966 IEEE80211_CHANCTX_REPLACE_NONE;
967
968 list_del_rcu(&ctx->list);
969 kfree_rcu(ctx, rcu_head);
970 } else {
971 ieee80211_free_chanctx(sdata->local, ctx);
972 }
973 }
974
975 return 0;
976 }
977
ieee80211_vif_reserve_chanctx(struct ieee80211_sub_if_data * sdata,const struct cfg80211_chan_def * chandef,enum ieee80211_chanctx_mode mode,bool radar_required)978 int ieee80211_vif_reserve_chanctx(struct ieee80211_sub_if_data *sdata,
979 const struct cfg80211_chan_def *chandef,
980 enum ieee80211_chanctx_mode mode,
981 bool radar_required)
982 {
983 struct ieee80211_local *local = sdata->local;
984 struct ieee80211_chanctx *new_ctx, *curr_ctx, *ctx;
985
986 lockdep_assert_held(&local->chanctx_mtx);
987
988 curr_ctx = ieee80211_vif_get_chanctx(sdata);
989 if (curr_ctx && local->use_chanctx && !local->ops->switch_vif_chanctx)
990 return -ENOTSUPP;
991
992 new_ctx = ieee80211_find_reservation_chanctx(local, chandef, mode);
993 if (!new_ctx) {
994 if (ieee80211_can_create_new_chanctx(local)) {
995 new_ctx = ieee80211_new_chanctx(local, chandef, mode);
996 if (IS_ERR(new_ctx))
997 return PTR_ERR(new_ctx);
998 } else {
999 if (!curr_ctx ||
1000 (curr_ctx->replace_state ==
1001 IEEE80211_CHANCTX_WILL_BE_REPLACED) ||
1002 !list_empty(&curr_ctx->reserved_vifs)) {
1003 /*
1004 * Another vif already requested this context
1005 * for a reservation. Find another one hoping
1006 * all vifs assigned to it will also switch
1007 * soon enough.
1008 *
1009 * TODO: This needs a little more work as some
1010 * cases (more than 2 chanctx capable devices)
1011 * may fail which could otherwise succeed
1012 * provided some channel context juggling was
1013 * performed.
1014 *
1015 * Consider ctx1..3, vif1..6, each ctx has 2
1016 * vifs. vif1 and vif2 from ctx1 request new
1017 * different chandefs starting 2 in-place
1018 * reserations with ctx4 and ctx5 replacing
1019 * ctx1 and ctx2 respectively. Next vif5 and
1020 * vif6 from ctx3 reserve ctx4. If vif3 and
1021 * vif4 remain on ctx2 as they are then this
1022 * fails unless `replace_ctx` from ctx5 is
1023 * replaced with ctx3.
1024 */
1025 list_for_each_entry(ctx, &local->chanctx_list,
1026 list) {
1027 if (ctx->replace_state !=
1028 IEEE80211_CHANCTX_REPLACE_NONE)
1029 continue;
1030
1031 if (!list_empty(&ctx->reserved_vifs))
1032 continue;
1033
1034 curr_ctx = ctx;
1035 break;
1036 }
1037 }
1038
1039 /*
1040 * If that's true then all available contexts already
1041 * have reservations and cannot be used.
1042 */
1043 if (!curr_ctx ||
1044 (curr_ctx->replace_state ==
1045 IEEE80211_CHANCTX_WILL_BE_REPLACED) ||
1046 !list_empty(&curr_ctx->reserved_vifs))
1047 return -EBUSY;
1048
1049 new_ctx = ieee80211_alloc_chanctx(local, chandef, mode);
1050 if (!new_ctx)
1051 return -ENOMEM;
1052
1053 new_ctx->replace_ctx = curr_ctx;
1054 new_ctx->replace_state =
1055 IEEE80211_CHANCTX_REPLACES_OTHER;
1056
1057 curr_ctx->replace_ctx = new_ctx;
1058 curr_ctx->replace_state =
1059 IEEE80211_CHANCTX_WILL_BE_REPLACED;
1060
1061 list_add_rcu(&new_ctx->list, &local->chanctx_list);
1062 }
1063 }
1064
1065 list_add(&sdata->reserved_chanctx_list, &new_ctx->reserved_vifs);
1066 sdata->reserved_chanctx = new_ctx;
1067 sdata->reserved_chandef = *chandef;
1068 sdata->reserved_radar_required = radar_required;
1069 sdata->reserved_ready = false;
1070
1071 return 0;
1072 }
1073
1074 static void
ieee80211_vif_chanctx_reservation_complete(struct ieee80211_sub_if_data * sdata)1075 ieee80211_vif_chanctx_reservation_complete(struct ieee80211_sub_if_data *sdata)
1076 {
1077 switch (sdata->vif.type) {
1078 case NL80211_IFTYPE_ADHOC:
1079 case NL80211_IFTYPE_AP:
1080 case NL80211_IFTYPE_MESH_POINT:
1081 case NL80211_IFTYPE_OCB:
1082 ieee80211_queue_work(&sdata->local->hw,
1083 &sdata->csa_finalize_work);
1084 break;
1085 case NL80211_IFTYPE_STATION:
1086 ieee80211_queue_work(&sdata->local->hw,
1087 &sdata->u.mgd.chswitch_work);
1088 break;
1089 case NL80211_IFTYPE_UNSPECIFIED:
1090 case NL80211_IFTYPE_AP_VLAN:
1091 case NL80211_IFTYPE_WDS:
1092 case NL80211_IFTYPE_MONITOR:
1093 case NL80211_IFTYPE_P2P_CLIENT:
1094 case NL80211_IFTYPE_P2P_GO:
1095 case NL80211_IFTYPE_P2P_DEVICE:
1096 case NL80211_IFTYPE_NAN:
1097 case NUM_NL80211_IFTYPES:
1098 WARN_ON(1);
1099 break;
1100 }
1101 }
1102
1103 static void
ieee80211_vif_update_chandef(struct ieee80211_sub_if_data * sdata,const struct cfg80211_chan_def * chandef)1104 ieee80211_vif_update_chandef(struct ieee80211_sub_if_data *sdata,
1105 const struct cfg80211_chan_def *chandef)
1106 {
1107 struct ieee80211_sub_if_data *vlan;
1108
1109 sdata->vif.bss_conf.chandef = *chandef;
1110
1111 if (sdata->vif.type != NL80211_IFTYPE_AP)
1112 return;
1113
1114 list_for_each_entry(vlan, &sdata->u.ap.vlans, u.vlan.list)
1115 vlan->vif.bss_conf.chandef = *chandef;
1116 }
1117
1118 static int
ieee80211_vif_use_reserved_reassign(struct ieee80211_sub_if_data * sdata)1119 ieee80211_vif_use_reserved_reassign(struct ieee80211_sub_if_data *sdata)
1120 {
1121 struct ieee80211_local *local = sdata->local;
1122 struct ieee80211_vif_chanctx_switch vif_chsw[1] = {};
1123 struct ieee80211_chanctx *old_ctx, *new_ctx;
1124 const struct cfg80211_chan_def *chandef;
1125 u32 changed = 0;
1126 int err;
1127
1128 lockdep_assert_held(&local->mtx);
1129 lockdep_assert_held(&local->chanctx_mtx);
1130
1131 new_ctx = sdata->reserved_chanctx;
1132 old_ctx = ieee80211_vif_get_chanctx(sdata);
1133
1134 if (WARN_ON(!sdata->reserved_ready))
1135 return -EBUSY;
1136
1137 if (WARN_ON(!new_ctx))
1138 return -EINVAL;
1139
1140 if (WARN_ON(!old_ctx))
1141 return -EINVAL;
1142
1143 if (WARN_ON(new_ctx->replace_state ==
1144 IEEE80211_CHANCTX_REPLACES_OTHER))
1145 return -EINVAL;
1146
1147 chandef = ieee80211_chanctx_non_reserved_chandef(local, new_ctx,
1148 &sdata->reserved_chandef);
1149 if (WARN_ON(!chandef))
1150 return -EINVAL;
1151
1152 if (sdata->vif.bss_conf.chandef.width != sdata->reserved_chandef.width)
1153 changed = BSS_CHANGED_BANDWIDTH;
1154
1155 ieee80211_vif_update_chandef(sdata, &sdata->reserved_chandef);
1156
1157 ieee80211_change_chanctx(local, new_ctx, old_ctx, chandef);
1158
1159 vif_chsw[0].vif = &sdata->vif;
1160 vif_chsw[0].old_ctx = &old_ctx->conf;
1161 vif_chsw[0].new_ctx = &new_ctx->conf;
1162
1163 list_del(&sdata->reserved_chanctx_list);
1164 sdata->reserved_chanctx = NULL;
1165
1166 err = drv_switch_vif_chanctx(local, vif_chsw, 1,
1167 CHANCTX_SWMODE_REASSIGN_VIF);
1168 if (err) {
1169 if (ieee80211_chanctx_refcount(local, new_ctx) == 0)
1170 ieee80211_free_chanctx(local, new_ctx);
1171
1172 goto out;
1173 }
1174
1175 list_move(&sdata->assigned_chanctx_list, &new_ctx->assigned_vifs);
1176 rcu_assign_pointer(sdata->vif.bss_conf.chanctx_conf, &new_ctx->conf);
1177
1178 if (sdata->vif.type == NL80211_IFTYPE_AP)
1179 __ieee80211_vif_copy_chanctx_to_vlans(sdata, false);
1180
1181 ieee80211_check_fast_xmit_iface(sdata);
1182
1183 if (ieee80211_chanctx_refcount(local, old_ctx) == 0)
1184 ieee80211_free_chanctx(local, old_ctx);
1185
1186 ieee80211_recalc_chanctx_min_def(local, new_ctx);
1187 ieee80211_recalc_smps_chanctx(local, new_ctx);
1188 ieee80211_recalc_radar_chanctx(local, new_ctx);
1189
1190 if (changed)
1191 ieee80211_bss_info_change_notify(sdata, changed);
1192
1193 out:
1194 ieee80211_vif_chanctx_reservation_complete(sdata);
1195 return err;
1196 }
1197
1198 static int
ieee80211_vif_use_reserved_assign(struct ieee80211_sub_if_data * sdata)1199 ieee80211_vif_use_reserved_assign(struct ieee80211_sub_if_data *sdata)
1200 {
1201 struct ieee80211_local *local = sdata->local;
1202 struct ieee80211_chanctx *old_ctx, *new_ctx;
1203 const struct cfg80211_chan_def *chandef;
1204 int err;
1205
1206 old_ctx = ieee80211_vif_get_chanctx(sdata);
1207 new_ctx = sdata->reserved_chanctx;
1208
1209 if (WARN_ON(!sdata->reserved_ready))
1210 return -EINVAL;
1211
1212 if (WARN_ON(old_ctx))
1213 return -EINVAL;
1214
1215 if (WARN_ON(!new_ctx))
1216 return -EINVAL;
1217
1218 if (WARN_ON(new_ctx->replace_state ==
1219 IEEE80211_CHANCTX_REPLACES_OTHER))
1220 return -EINVAL;
1221
1222 chandef = ieee80211_chanctx_non_reserved_chandef(local, new_ctx,
1223 &sdata->reserved_chandef);
1224 if (WARN_ON(!chandef))
1225 return -EINVAL;
1226
1227 ieee80211_change_chanctx(local, new_ctx, new_ctx, chandef);
1228
1229 list_del(&sdata->reserved_chanctx_list);
1230 sdata->reserved_chanctx = NULL;
1231
1232 err = ieee80211_assign_vif_chanctx(sdata, new_ctx);
1233 if (err) {
1234 if (ieee80211_chanctx_refcount(local, new_ctx) == 0)
1235 ieee80211_free_chanctx(local, new_ctx);
1236
1237 goto out;
1238 }
1239
1240 out:
1241 ieee80211_vif_chanctx_reservation_complete(sdata);
1242 return err;
1243 }
1244
1245 static bool
ieee80211_vif_has_in_place_reservation(struct ieee80211_sub_if_data * sdata)1246 ieee80211_vif_has_in_place_reservation(struct ieee80211_sub_if_data *sdata)
1247 {
1248 struct ieee80211_chanctx *old_ctx, *new_ctx;
1249
1250 lockdep_assert_held(&sdata->local->chanctx_mtx);
1251
1252 new_ctx = sdata->reserved_chanctx;
1253 old_ctx = ieee80211_vif_get_chanctx(sdata);
1254
1255 if (!old_ctx)
1256 return false;
1257
1258 if (WARN_ON(!new_ctx))
1259 return false;
1260
1261 if (old_ctx->replace_state != IEEE80211_CHANCTX_WILL_BE_REPLACED)
1262 return false;
1263
1264 if (new_ctx->replace_state != IEEE80211_CHANCTX_REPLACES_OTHER)
1265 return false;
1266
1267 return true;
1268 }
1269
ieee80211_chsw_switch_hwconf(struct ieee80211_local * local,struct ieee80211_chanctx * new_ctx)1270 static int ieee80211_chsw_switch_hwconf(struct ieee80211_local *local,
1271 struct ieee80211_chanctx *new_ctx)
1272 {
1273 const struct cfg80211_chan_def *chandef;
1274
1275 lockdep_assert_held(&local->mtx);
1276 lockdep_assert_held(&local->chanctx_mtx);
1277
1278 chandef = ieee80211_chanctx_reserved_chandef(local, new_ctx, NULL);
1279 if (WARN_ON(!chandef))
1280 return -EINVAL;
1281
1282 local->hw.conf.radar_enabled = new_ctx->conf.radar_enabled;
1283 local->_oper_chandef = *chandef;
1284 ieee80211_hw_config(local, 0);
1285
1286 return 0;
1287 }
1288
ieee80211_chsw_switch_vifs(struct ieee80211_local * local,int n_vifs)1289 static int ieee80211_chsw_switch_vifs(struct ieee80211_local *local,
1290 int n_vifs)
1291 {
1292 struct ieee80211_vif_chanctx_switch *vif_chsw;
1293 struct ieee80211_sub_if_data *sdata;
1294 struct ieee80211_chanctx *ctx, *old_ctx;
1295 int i, err;
1296
1297 lockdep_assert_held(&local->mtx);
1298 lockdep_assert_held(&local->chanctx_mtx);
1299
1300 vif_chsw = kcalloc(n_vifs, sizeof(vif_chsw[0]), GFP_KERNEL);
1301 if (!vif_chsw)
1302 return -ENOMEM;
1303
1304 i = 0;
1305 list_for_each_entry(ctx, &local->chanctx_list, list) {
1306 if (ctx->replace_state != IEEE80211_CHANCTX_REPLACES_OTHER)
1307 continue;
1308
1309 if (WARN_ON(!ctx->replace_ctx)) {
1310 err = -EINVAL;
1311 goto out;
1312 }
1313
1314 list_for_each_entry(sdata, &ctx->reserved_vifs,
1315 reserved_chanctx_list) {
1316 if (!ieee80211_vif_has_in_place_reservation(
1317 sdata))
1318 continue;
1319
1320 old_ctx = ieee80211_vif_get_chanctx(sdata);
1321 vif_chsw[i].vif = &sdata->vif;
1322 vif_chsw[i].old_ctx = &old_ctx->conf;
1323 vif_chsw[i].new_ctx = &ctx->conf;
1324
1325 i++;
1326 }
1327 }
1328
1329 err = drv_switch_vif_chanctx(local, vif_chsw, n_vifs,
1330 CHANCTX_SWMODE_SWAP_CONTEXTS);
1331
1332 out:
1333 kfree(vif_chsw);
1334 return err;
1335 }
1336
ieee80211_chsw_switch_ctxs(struct ieee80211_local * local)1337 static int ieee80211_chsw_switch_ctxs(struct ieee80211_local *local)
1338 {
1339 struct ieee80211_chanctx *ctx;
1340 int err;
1341
1342 lockdep_assert_held(&local->mtx);
1343 lockdep_assert_held(&local->chanctx_mtx);
1344
1345 list_for_each_entry(ctx, &local->chanctx_list, list) {
1346 if (ctx->replace_state != IEEE80211_CHANCTX_REPLACES_OTHER)
1347 continue;
1348
1349 if (!list_empty(&ctx->replace_ctx->assigned_vifs))
1350 continue;
1351
1352 ieee80211_del_chanctx(local, ctx->replace_ctx);
1353 err = ieee80211_add_chanctx(local, ctx);
1354 if (err)
1355 goto err;
1356 }
1357
1358 return 0;
1359
1360 err:
1361 WARN_ON(ieee80211_add_chanctx(local, ctx));
1362 list_for_each_entry_continue_reverse(ctx, &local->chanctx_list, list) {
1363 if (ctx->replace_state != IEEE80211_CHANCTX_REPLACES_OTHER)
1364 continue;
1365
1366 if (!list_empty(&ctx->replace_ctx->assigned_vifs))
1367 continue;
1368
1369 ieee80211_del_chanctx(local, ctx);
1370 WARN_ON(ieee80211_add_chanctx(local, ctx->replace_ctx));
1371 }
1372
1373 return err;
1374 }
1375
ieee80211_vif_use_reserved_switch(struct ieee80211_local * local)1376 static int ieee80211_vif_use_reserved_switch(struct ieee80211_local *local)
1377 {
1378 struct ieee80211_sub_if_data *sdata, *sdata_tmp;
1379 struct ieee80211_chanctx *ctx, *ctx_tmp, *old_ctx;
1380 struct ieee80211_chanctx *new_ctx = NULL;
1381 int err, n_assigned, n_reserved, n_ready;
1382 int n_ctx = 0, n_vifs_switch = 0, n_vifs_assign = 0, n_vifs_ctxless = 0;
1383
1384 lockdep_assert_held(&local->mtx);
1385 lockdep_assert_held(&local->chanctx_mtx);
1386
1387 /*
1388 * If there are 2 independent pairs of channel contexts performing
1389 * cross-switch of their vifs this code will still wait until both are
1390 * ready even though it could be possible to switch one before the
1391 * other is ready.
1392 *
1393 * For practical reasons and code simplicity just do a single huge
1394 * switch.
1395 */
1396
1397 /*
1398 * Verify if the reservation is still feasible.
1399 * - if it's not then disconnect
1400 * - if it is but not all vifs necessary are ready then defer
1401 */
1402
1403 list_for_each_entry(ctx, &local->chanctx_list, list) {
1404 if (ctx->replace_state != IEEE80211_CHANCTX_REPLACES_OTHER)
1405 continue;
1406
1407 if (WARN_ON(!ctx->replace_ctx)) {
1408 err = -EINVAL;
1409 goto err;
1410 }
1411
1412 if (!local->use_chanctx)
1413 new_ctx = ctx;
1414
1415 n_ctx++;
1416
1417 n_assigned = 0;
1418 n_reserved = 0;
1419 n_ready = 0;
1420
1421 list_for_each_entry(sdata, &ctx->replace_ctx->assigned_vifs,
1422 assigned_chanctx_list) {
1423 n_assigned++;
1424 if (sdata->reserved_chanctx) {
1425 n_reserved++;
1426 if (sdata->reserved_ready)
1427 n_ready++;
1428 }
1429 }
1430
1431 if (n_assigned != n_reserved) {
1432 if (n_ready == n_reserved) {
1433 wiphy_info(local->hw.wiphy,
1434 "channel context reservation cannot be finalized because some interfaces aren't switching\n");
1435 err = -EBUSY;
1436 goto err;
1437 }
1438
1439 return -EAGAIN;
1440 }
1441
1442 ctx->conf.radar_enabled = false;
1443 list_for_each_entry(sdata, &ctx->reserved_vifs,
1444 reserved_chanctx_list) {
1445 if (ieee80211_vif_has_in_place_reservation(sdata) &&
1446 !sdata->reserved_ready)
1447 return -EAGAIN;
1448
1449 old_ctx = ieee80211_vif_get_chanctx(sdata);
1450 if (old_ctx) {
1451 if (old_ctx->replace_state ==
1452 IEEE80211_CHANCTX_WILL_BE_REPLACED)
1453 n_vifs_switch++;
1454 else
1455 n_vifs_assign++;
1456 } else {
1457 n_vifs_ctxless++;
1458 }
1459
1460 if (sdata->reserved_radar_required)
1461 ctx->conf.radar_enabled = true;
1462 }
1463 }
1464
1465 if (WARN_ON(n_ctx == 0) ||
1466 WARN_ON(n_vifs_switch == 0 &&
1467 n_vifs_assign == 0 &&
1468 n_vifs_ctxless == 0) ||
1469 WARN_ON(n_ctx > 1 && !local->use_chanctx) ||
1470 WARN_ON(!new_ctx && !local->use_chanctx)) {
1471 err = -EINVAL;
1472 goto err;
1473 }
1474
1475 /*
1476 * All necessary vifs are ready. Perform the switch now depending on
1477 * reservations and driver capabilities.
1478 */
1479
1480 if (local->use_chanctx) {
1481 if (n_vifs_switch > 0) {
1482 err = ieee80211_chsw_switch_vifs(local, n_vifs_switch);
1483 if (err)
1484 goto err;
1485 }
1486
1487 if (n_vifs_assign > 0 || n_vifs_ctxless > 0) {
1488 err = ieee80211_chsw_switch_ctxs(local);
1489 if (err)
1490 goto err;
1491 }
1492 } else {
1493 err = ieee80211_chsw_switch_hwconf(local, new_ctx);
1494 if (err)
1495 goto err;
1496 }
1497
1498 /*
1499 * Update all structures, values and pointers to point to new channel
1500 * context(s).
1501 */
1502 list_for_each_entry(ctx, &local->chanctx_list, list) {
1503 if (ctx->replace_state != IEEE80211_CHANCTX_REPLACES_OTHER)
1504 continue;
1505
1506 if (WARN_ON(!ctx->replace_ctx)) {
1507 err = -EINVAL;
1508 goto err;
1509 }
1510
1511 list_for_each_entry(sdata, &ctx->reserved_vifs,
1512 reserved_chanctx_list) {
1513 u32 changed = 0;
1514
1515 if (!ieee80211_vif_has_in_place_reservation(sdata))
1516 continue;
1517
1518 rcu_assign_pointer(sdata->vif.bss_conf.chanctx_conf,
1519 &ctx->conf);
1520
1521 if (sdata->vif.type == NL80211_IFTYPE_AP)
1522 __ieee80211_vif_copy_chanctx_to_vlans(sdata,
1523 false);
1524
1525 ieee80211_check_fast_xmit_iface(sdata);
1526
1527 sdata->radar_required = sdata->reserved_radar_required;
1528
1529 if (sdata->vif.bss_conf.chandef.width !=
1530 sdata->reserved_chandef.width)
1531 changed = BSS_CHANGED_BANDWIDTH;
1532
1533 ieee80211_vif_update_chandef(sdata, &sdata->reserved_chandef);
1534 if (changed)
1535 ieee80211_bss_info_change_notify(sdata,
1536 changed);
1537
1538 ieee80211_recalc_txpower(sdata, false);
1539 }
1540
1541 ieee80211_recalc_chanctx_chantype(local, ctx);
1542 ieee80211_recalc_smps_chanctx(local, ctx);
1543 ieee80211_recalc_radar_chanctx(local, ctx);
1544 ieee80211_recalc_chanctx_min_def(local, ctx);
1545
1546 list_for_each_entry_safe(sdata, sdata_tmp, &ctx->reserved_vifs,
1547 reserved_chanctx_list) {
1548 if (ieee80211_vif_get_chanctx(sdata) != ctx)
1549 continue;
1550
1551 list_del(&sdata->reserved_chanctx_list);
1552 list_move(&sdata->assigned_chanctx_list,
1553 &ctx->assigned_vifs);
1554 sdata->reserved_chanctx = NULL;
1555
1556 ieee80211_vif_chanctx_reservation_complete(sdata);
1557 }
1558
1559 /*
1560 * This context might have been a dependency for an already
1561 * ready re-assign reservation interface that was deferred. Do
1562 * not propagate error to the caller though. The in-place
1563 * reservation for originally requested interface has already
1564 * succeeded at this point.
1565 */
1566 list_for_each_entry_safe(sdata, sdata_tmp, &ctx->reserved_vifs,
1567 reserved_chanctx_list) {
1568 if (WARN_ON(ieee80211_vif_has_in_place_reservation(
1569 sdata)))
1570 continue;
1571
1572 if (WARN_ON(sdata->reserved_chanctx != ctx))
1573 continue;
1574
1575 if (!sdata->reserved_ready)
1576 continue;
1577
1578 if (ieee80211_vif_get_chanctx(sdata))
1579 err = ieee80211_vif_use_reserved_reassign(
1580 sdata);
1581 else
1582 err = ieee80211_vif_use_reserved_assign(sdata);
1583
1584 if (err) {
1585 sdata_info(sdata,
1586 "failed to finalize (re-)assign reservation (err=%d)\n",
1587 err);
1588 ieee80211_vif_unreserve_chanctx(sdata);
1589 cfg80211_stop_iface(local->hw.wiphy,
1590 &sdata->wdev,
1591 GFP_KERNEL);
1592 }
1593 }
1594 }
1595
1596 /*
1597 * Finally free old contexts
1598 */
1599
1600 list_for_each_entry_safe(ctx, ctx_tmp, &local->chanctx_list, list) {
1601 if (ctx->replace_state != IEEE80211_CHANCTX_WILL_BE_REPLACED)
1602 continue;
1603
1604 ctx->replace_ctx->replace_ctx = NULL;
1605 ctx->replace_ctx->replace_state =
1606 IEEE80211_CHANCTX_REPLACE_NONE;
1607
1608 list_del_rcu(&ctx->list);
1609 kfree_rcu(ctx, rcu_head);
1610 }
1611
1612 return 0;
1613
1614 err:
1615 list_for_each_entry(ctx, &local->chanctx_list, list) {
1616 if (ctx->replace_state != IEEE80211_CHANCTX_REPLACES_OTHER)
1617 continue;
1618
1619 list_for_each_entry_safe(sdata, sdata_tmp, &ctx->reserved_vifs,
1620 reserved_chanctx_list) {
1621 ieee80211_vif_unreserve_chanctx(sdata);
1622 ieee80211_vif_chanctx_reservation_complete(sdata);
1623 }
1624 }
1625
1626 return err;
1627 }
1628
__ieee80211_vif_release_channel(struct ieee80211_sub_if_data * sdata)1629 static void __ieee80211_vif_release_channel(struct ieee80211_sub_if_data *sdata)
1630 {
1631 struct ieee80211_local *local = sdata->local;
1632 struct ieee80211_chanctx_conf *conf;
1633 struct ieee80211_chanctx *ctx;
1634 bool use_reserved_switch = false;
1635
1636 lockdep_assert_held(&local->chanctx_mtx);
1637
1638 conf = rcu_dereference_protected(sdata->vif.bss_conf.chanctx_conf,
1639 lockdep_is_held(&local->chanctx_mtx));
1640 if (!conf)
1641 return;
1642
1643 ctx = container_of(conf, struct ieee80211_chanctx, conf);
1644
1645 if (sdata->reserved_chanctx) {
1646 if (sdata->reserved_chanctx->replace_state ==
1647 IEEE80211_CHANCTX_REPLACES_OTHER &&
1648 ieee80211_chanctx_num_reserved(local,
1649 sdata->reserved_chanctx) > 1)
1650 use_reserved_switch = true;
1651
1652 ieee80211_vif_unreserve_chanctx(sdata);
1653 }
1654
1655 ieee80211_assign_vif_chanctx(sdata, NULL);
1656 if (ieee80211_chanctx_refcount(local, ctx) == 0)
1657 ieee80211_free_chanctx(local, ctx);
1658
1659 sdata->radar_required = false;
1660
1661 /* Unreserving may ready an in-place reservation. */
1662 if (use_reserved_switch)
1663 ieee80211_vif_use_reserved_switch(local);
1664 }
1665
ieee80211_vif_use_channel(struct ieee80211_sub_if_data * sdata,const struct cfg80211_chan_def * chandef,enum ieee80211_chanctx_mode mode)1666 int ieee80211_vif_use_channel(struct ieee80211_sub_if_data *sdata,
1667 const struct cfg80211_chan_def *chandef,
1668 enum ieee80211_chanctx_mode mode)
1669 {
1670 struct ieee80211_local *local = sdata->local;
1671 struct ieee80211_chanctx *ctx;
1672 u8 radar_detect_width = 0;
1673 int ret;
1674
1675 lockdep_assert_held(&local->mtx);
1676
1677 WARN_ON(sdata->dev && netif_carrier_ok(sdata->dev));
1678
1679 mutex_lock(&local->chanctx_mtx);
1680
1681 ret = cfg80211_chandef_dfs_required(local->hw.wiphy,
1682 chandef,
1683 sdata->wdev.iftype);
1684 if (ret < 0)
1685 goto out;
1686 if (ret > 0)
1687 radar_detect_width = BIT(chandef->width);
1688
1689 sdata->radar_required = ret;
1690
1691 ret = ieee80211_check_combinations(sdata, chandef, mode,
1692 radar_detect_width);
1693 if (ret < 0)
1694 goto out;
1695
1696 __ieee80211_vif_release_channel(sdata);
1697
1698 ctx = ieee80211_find_chanctx(local, chandef, mode);
1699 if (!ctx)
1700 ctx = ieee80211_new_chanctx(local, chandef, mode);
1701 if (IS_ERR(ctx)) {
1702 ret = PTR_ERR(ctx);
1703 goto out;
1704 }
1705
1706 ieee80211_vif_update_chandef(sdata, chandef);
1707
1708 ret = ieee80211_assign_vif_chanctx(sdata, ctx);
1709 if (ret) {
1710 /* if assign fails refcount stays the same */
1711 if (ieee80211_chanctx_refcount(local, ctx) == 0)
1712 ieee80211_free_chanctx(local, ctx);
1713 goto out;
1714 }
1715
1716 ieee80211_recalc_smps_chanctx(local, ctx);
1717 ieee80211_recalc_radar_chanctx(local, ctx);
1718 out:
1719 if (ret)
1720 sdata->radar_required = false;
1721
1722 mutex_unlock(&local->chanctx_mtx);
1723 return ret;
1724 }
1725
ieee80211_vif_use_reserved_context(struct ieee80211_sub_if_data * sdata)1726 int ieee80211_vif_use_reserved_context(struct ieee80211_sub_if_data *sdata)
1727 {
1728 struct ieee80211_local *local = sdata->local;
1729 struct ieee80211_chanctx *new_ctx;
1730 struct ieee80211_chanctx *old_ctx;
1731 int err;
1732
1733 lockdep_assert_held(&local->mtx);
1734 lockdep_assert_held(&local->chanctx_mtx);
1735
1736 new_ctx = sdata->reserved_chanctx;
1737 old_ctx = ieee80211_vif_get_chanctx(sdata);
1738
1739 if (WARN_ON(!new_ctx))
1740 return -EINVAL;
1741
1742 if (WARN_ON(new_ctx->replace_state ==
1743 IEEE80211_CHANCTX_WILL_BE_REPLACED))
1744 return -EINVAL;
1745
1746 if (WARN_ON(sdata->reserved_ready))
1747 return -EINVAL;
1748
1749 sdata->reserved_ready = true;
1750
1751 if (new_ctx->replace_state == IEEE80211_CHANCTX_REPLACE_NONE) {
1752 if (old_ctx)
1753 return ieee80211_vif_use_reserved_reassign(sdata);
1754
1755 return ieee80211_vif_use_reserved_assign(sdata);
1756 }
1757
1758 /*
1759 * In-place reservation may need to be finalized now either if:
1760 * a) sdata is taking part in the swapping itself and is the last one
1761 * b) sdata has switched with a re-assign reservation to an existing
1762 * context readying in-place switching of old_ctx
1763 *
1764 * In case of (b) do not propagate the error up because the requested
1765 * sdata already switched successfully. Just spill an extra warning.
1766 * The ieee80211_vif_use_reserved_switch() already stops all necessary
1767 * interfaces upon failure.
1768 */
1769 if ((old_ctx &&
1770 old_ctx->replace_state == IEEE80211_CHANCTX_WILL_BE_REPLACED) ||
1771 new_ctx->replace_state == IEEE80211_CHANCTX_REPLACES_OTHER) {
1772 err = ieee80211_vif_use_reserved_switch(local);
1773 if (err && err != -EAGAIN) {
1774 if (new_ctx->replace_state ==
1775 IEEE80211_CHANCTX_REPLACES_OTHER)
1776 return err;
1777
1778 wiphy_info(local->hw.wiphy,
1779 "depending in-place reservation failed (err=%d)\n",
1780 err);
1781 }
1782 }
1783
1784 return 0;
1785 }
1786
ieee80211_vif_change_bandwidth(struct ieee80211_sub_if_data * sdata,const struct cfg80211_chan_def * chandef,u32 * changed)1787 int ieee80211_vif_change_bandwidth(struct ieee80211_sub_if_data *sdata,
1788 const struct cfg80211_chan_def *chandef,
1789 u32 *changed)
1790 {
1791 struct ieee80211_local *local = sdata->local;
1792 struct ieee80211_chanctx_conf *conf;
1793 struct ieee80211_chanctx *ctx;
1794 const struct cfg80211_chan_def *compat;
1795 int ret;
1796
1797 if (!cfg80211_chandef_usable(sdata->local->hw.wiphy, chandef,
1798 IEEE80211_CHAN_DISABLED))
1799 return -EINVAL;
1800
1801 mutex_lock(&local->chanctx_mtx);
1802 if (cfg80211_chandef_identical(chandef, &sdata->vif.bss_conf.chandef)) {
1803 ret = 0;
1804 goto out;
1805 }
1806
1807 if (chandef->width == NL80211_CHAN_WIDTH_20_NOHT ||
1808 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_20_NOHT) {
1809 ret = -EINVAL;
1810 goto out;
1811 }
1812
1813 conf = rcu_dereference_protected(sdata->vif.bss_conf.chanctx_conf,
1814 lockdep_is_held(&local->chanctx_mtx));
1815 if (!conf) {
1816 ret = -EINVAL;
1817 goto out;
1818 }
1819
1820 ctx = container_of(conf, struct ieee80211_chanctx, conf);
1821
1822 compat = cfg80211_chandef_compatible(&conf->def, chandef);
1823 if (!compat) {
1824 ret = -EINVAL;
1825 goto out;
1826 }
1827
1828 switch (ctx->replace_state) {
1829 case IEEE80211_CHANCTX_REPLACE_NONE:
1830 if (!ieee80211_chanctx_reserved_chandef(local, ctx, compat)) {
1831 ret = -EBUSY;
1832 goto out;
1833 }
1834 break;
1835 case IEEE80211_CHANCTX_WILL_BE_REPLACED:
1836 /* TODO: Perhaps the bandwidth change could be treated as a
1837 * reservation itself? */
1838 ret = -EBUSY;
1839 goto out;
1840 case IEEE80211_CHANCTX_REPLACES_OTHER:
1841 /* channel context that is going to replace another channel
1842 * context doesn't really exist and shouldn't be assigned
1843 * anywhere yet */
1844 WARN_ON(1);
1845 break;
1846 }
1847
1848 ieee80211_vif_update_chandef(sdata, chandef);
1849
1850 ieee80211_recalc_chanctx_chantype(local, ctx);
1851
1852 *changed |= BSS_CHANGED_BANDWIDTH;
1853 ret = 0;
1854 out:
1855 mutex_unlock(&local->chanctx_mtx);
1856 return ret;
1857 }
1858
ieee80211_vif_release_channel(struct ieee80211_sub_if_data * sdata)1859 void ieee80211_vif_release_channel(struct ieee80211_sub_if_data *sdata)
1860 {
1861 WARN_ON(sdata->dev && netif_carrier_ok(sdata->dev));
1862
1863 lockdep_assert_held(&sdata->local->mtx);
1864
1865 mutex_lock(&sdata->local->chanctx_mtx);
1866 __ieee80211_vif_release_channel(sdata);
1867 mutex_unlock(&sdata->local->chanctx_mtx);
1868 }
1869
ieee80211_vif_vlan_copy_chanctx(struct ieee80211_sub_if_data * sdata)1870 void ieee80211_vif_vlan_copy_chanctx(struct ieee80211_sub_if_data *sdata)
1871 {
1872 struct ieee80211_local *local = sdata->local;
1873 struct ieee80211_sub_if_data *ap;
1874 struct ieee80211_chanctx_conf *conf;
1875
1876 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_AP_VLAN || !sdata->bss))
1877 return;
1878
1879 ap = container_of(sdata->bss, struct ieee80211_sub_if_data, u.ap);
1880
1881 mutex_lock(&local->chanctx_mtx);
1882
1883 conf = rcu_dereference_protected(ap->vif.bss_conf.chanctx_conf,
1884 lockdep_is_held(&local->chanctx_mtx));
1885 rcu_assign_pointer(sdata->vif.bss_conf.chanctx_conf, conf);
1886 mutex_unlock(&local->chanctx_mtx);
1887 }
1888
ieee80211_iter_chan_contexts_atomic(struct ieee80211_hw * hw,void (* iter)(struct ieee80211_hw * hw,struct ieee80211_chanctx_conf * chanctx_conf,void * data),void * iter_data)1889 void ieee80211_iter_chan_contexts_atomic(
1890 struct ieee80211_hw *hw,
1891 void (*iter)(struct ieee80211_hw *hw,
1892 struct ieee80211_chanctx_conf *chanctx_conf,
1893 void *data),
1894 void *iter_data)
1895 {
1896 struct ieee80211_local *local = hw_to_local(hw);
1897 struct ieee80211_chanctx *ctx;
1898
1899 rcu_read_lock();
1900 list_for_each_entry_rcu(ctx, &local->chanctx_list, list)
1901 if (ctx->driver_present)
1902 iter(hw, &ctx->conf, iter_data);
1903 rcu_read_unlock();
1904 }
1905 EXPORT_SYMBOL_GPL(ieee80211_iter_chan_contexts_atomic);
1906