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mac80211: add min required channel definition field
[linux-block.git] / net / mac80211 / chan.c
CommitLineData
f444de05
JB		 1/*
2 * mac80211 - channel management
3 */
4
0aaffa9b 5#include <linux/nl80211.h>
3448c005 6#include <linux/export.h>
4d76d21b 7#include <linux/rtnetlink.h>
3117bbdb 8#include <net/cfg80211.h>
f444de05 9#include "ieee80211_i.h"
35f2fce9 10#include "driver-ops.h"
f444de05 11
21f659bf
EP		 12static enum nl80211_chan_width ieee80211_get_sta_bw(struct ieee80211_sta *sta)
13{
14 switch (sta->bandwidth) {
15 case IEEE80211_STA_RX_BW_20:
16 if (sta->ht_cap.ht_supported)
17 return NL80211_CHAN_WIDTH_20;
18 else
19 return NL80211_CHAN_WIDTH_20_NOHT;
20 case IEEE80211_STA_RX_BW_40:
21 return NL80211_CHAN_WIDTH_40;
22 case IEEE80211_STA_RX_BW_80:
23 return NL80211_CHAN_WIDTH_80;
24 case IEEE80211_STA_RX_BW_160:
25 /*
26 * This applied for both 160 and 80+80. since we use
27 * the returned value to consider degradation of
28 * ctx->conf.min_def, we have to make sure to take
29 * the bigger one (NL80211_CHAN_WIDTH_160).
30 * Otherwise we might try degrading even when not
31 * needed, as the max required sta_bw returned (80+80)
32 * might be smaller than the configured bw (160).
33 */
34 return NL80211_CHAN_WIDTH_160;
35 default:
36 WARN_ON(1);
37 return NL80211_CHAN_WIDTH_20;
38 }
39}
40
41static enum nl80211_chan_width
42ieee80211_get_max_required_bw(struct ieee80211_sub_if_data *sdata)
43{
44 enum nl80211_chan_width max_bw = NL80211_CHAN_WIDTH_20_NOHT;
45 struct sta_info *sta;
46
47 rcu_read_lock();
48 list_for_each_entry_rcu(sta, &sdata->local->sta_list, list) {
49 if (sdata != sta->sdata &&
50 !(sta->sdata->bss && sta->sdata->bss == sdata->bss))
51 continue;
52
53 if (!sta->uploaded)
54 continue;
55
56 max_bw = max(max_bw, ieee80211_get_sta_bw(&sta->sta));
57 }
58 rcu_read_unlock();
59
60 return max_bw;
61}
62
63static enum nl80211_chan_width
64ieee80211_get_chanctx_max_required_bw(struct ieee80211_local *local,
65 struct ieee80211_chanctx_conf *conf)
66{
67 struct ieee80211_sub_if_data *sdata;
68 enum nl80211_chan_width max_bw = NL80211_CHAN_WIDTH_20_NOHT;
69
70 rcu_read_lock();
71 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
72 struct ieee80211_vif *vif = &sdata->vif;
73 enum nl80211_chan_width width = NL80211_CHAN_WIDTH_20_NOHT;
74
75 if (!ieee80211_sdata_running(sdata))
76 continue;
77
78 if (rcu_access_pointer(sdata->vif.chanctx_conf) != conf)
79 continue;
80
81 switch (vif->type) {
82 case NL80211_IFTYPE_AP:
83 case NL80211_IFTYPE_AP_VLAN:
84 width = ieee80211_get_max_required_bw(sdata);
85 break;
86 case NL80211_IFTYPE_P2P_DEVICE:
87 continue;
88 case NL80211_IFTYPE_STATION:
89 case NL80211_IFTYPE_ADHOC:
90 case NL80211_IFTYPE_WDS:
91 case NL80211_IFTYPE_MESH_POINT:
92 width = vif->bss_conf.chandef.width;
93 break;
94 case NL80211_IFTYPE_UNSPECIFIED:
95 case NUM_NL80211_IFTYPES:
96 case NL80211_IFTYPE_MONITOR:
97 case NL80211_IFTYPE_P2P_CLIENT:
98 case NL80211_IFTYPE_P2P_GO:
99 WARN_ON_ONCE(1);
100 }
101 max_bw = max(max_bw, width);
102 }
103 rcu_read_unlock();
104
105 return max_bw;
106}
107
108/*
109 * recalc the min required chan width of the channel context, which is
110 * the max of min required widths of all the interfaces bound to this
111 * channel context.
112 */
113void ieee80211_recalc_chanctx_min_def(struct ieee80211_local *local,
114 struct ieee80211_chanctx *ctx)
115{
116 enum nl80211_chan_width max_bw;
117 struct cfg80211_chan_def min_def;
118
119 lockdep_assert_held(&local->chanctx_mtx);
120
121 /* don't optimize 5MHz, 10MHz, and radar_enabled confs */
122 if (ctx->conf.def.width == NL80211_CHAN_WIDTH_5 ||
123 ctx->conf.def.width == NL80211_CHAN_WIDTH_10 ||
124 ctx->conf.radar_enabled) {
125 ctx->conf.min_def = ctx->conf.def;
126 return;
127 }
128
129 max_bw = ieee80211_get_chanctx_max_required_bw(local, &ctx->conf);
130
131 /* downgrade chandef up to max_bw */
132 min_def = ctx->conf.def;
133 while (min_def.width > max_bw)
134 ieee80211_chandef_downgrade(&min_def);
135
136 if (cfg80211_chandef_identical(&ctx->conf.min_def, &min_def))
137 return;
138
139 ctx->conf.min_def = min_def;
140 if (!ctx->driver_present)
141 return;
142
143 drv_change_chanctx(local, ctx, IEEE80211_CHANCTX_CHANGE_MIN_WIDTH);
144}
145
18942d3b 146static void ieee80211_change_chanctx(struct ieee80211_local *local,
4bf88530
JB		 147 struct ieee80211_chanctx *ctx,
148 const struct cfg80211_chan_def *chandef)
23a85b45 149{
4bf88530 150 if (cfg80211_chandef_identical(&ctx->conf.def, chandef))
e89a96f5 151 return;
0aaffa9b 152
4bf88530
JB		 153 WARN_ON(!cfg80211_chandef_compatible(&ctx->conf.def, chandef));
154
155 ctx->conf.def = *chandef;
156 drv_change_chanctx(local, ctx, IEEE80211_CHANCTX_CHANGE_WIDTH);
21f659bf 157 ieee80211_recalc_chanctx_min_def(local, ctx);
55de908a
JB		 158
159 if (!local->use_chanctx) {
675a0b04 160 local->_oper_chandef = *chandef;
55de908a
JB		 161 ieee80211_hw_config(local, 0);
162 }
0aaffa9b 163}
d01a1e65
MK		 164
165static struct ieee80211_chanctx *
166ieee80211_find_chanctx(struct ieee80211_local *local,
4bf88530 167 const struct cfg80211_chan_def *chandef,
d01a1e65
MK		 168 enum ieee80211_chanctx_mode mode)
169{
170 struct ieee80211_chanctx *ctx;
171
172 lockdep_assert_held(&local->chanctx_mtx);
173
174 if (mode == IEEE80211_CHANCTX_EXCLUSIVE)
175 return NULL;
d01a1e65
MK		 176
177 list_for_each_entry(ctx, &local->chanctx_list, list) {
4bf88530 178 const struct cfg80211_chan_def *compat;
e89a96f5 179
d01a1e65
MK		 180 if (ctx->mode == IEEE80211_CHANCTX_EXCLUSIVE)
181 continue;
4bf88530
JB		 182
183 compat = cfg80211_chandef_compatible(&ctx->conf.def, chandef);
184 if (!compat)
d01a1e65
MK		 185 continue;
186
18942d3b 187 ieee80211_change_chanctx(local, ctx, compat);
e89a96f5 188
d01a1e65
MK		 189 return ctx;
190 }
191
192 return NULL;
193}
194
e4746851
SW		 195static bool ieee80211_is_radar_required(struct ieee80211_local *local)
196{
197 struct ieee80211_sub_if_data *sdata;
198
199 rcu_read_lock();
200 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
201 if (sdata->radar_required) {
202 rcu_read_unlock();
203 return true;
204 }
205 }
206 rcu_read_unlock();
207
208 return false;
209}
210
d01a1e65
MK		 211static struct ieee80211_chanctx *
212ieee80211_new_chanctx(struct ieee80211_local *local,
4bf88530 213 const struct cfg80211_chan_def *chandef,
d01a1e65
MK		 214 enum ieee80211_chanctx_mode mode)
215{
216 struct ieee80211_chanctx *ctx;
382a103b 217 u32 changed;
35f2fce9 218 int err;
d01a1e65
MK		 219
220 lockdep_assert_held(&local->chanctx_mtx);
221
222 ctx = kzalloc(sizeof(*ctx) + local->hw.chanctx_data_size, GFP_KERNEL);
223 if (!ctx)
224 return ERR_PTR(-ENOMEM);
225
4bf88530 226 ctx->conf.def = *chandef;
04ecd257
JB		 227 ctx->conf.rx_chains_static = 1;
228 ctx->conf.rx_chains_dynamic = 1;
d01a1e65 229 ctx->mode = mode;
e4746851 230 ctx->conf.radar_enabled = ieee80211_is_radar_required(local);
21f659bf 231 ieee80211_recalc_chanctx_min_def(local, ctx);
e4746851
SW		 232 if (!local->use_chanctx)
233 local->hw.conf.radar_enabled = ctx->conf.radar_enabled;
d01a1e65 234
382a103b
JB		 235 /* acquire mutex to prevent idle from changing */
236 mutex_lock(&local->mtx);
237 /* turn idle off *before* setting channel -- some drivers need that */
238 changed = ieee80211_idle_off(local);
239 if (changed)
240 ieee80211_hw_config(local, changed);
241
55de908a 242 if (!local->use_chanctx) {
675a0b04 243 local->_oper_chandef = *chandef;
55de908a
JB		 244 ieee80211_hw_config(local, 0);
245 } else {
246 err = drv_add_chanctx(local, ctx);
247 if (err) {
248 kfree(ctx);
382a103b
JB		 249 ctx = ERR_PTR(err);
250
251 ieee80211_recalc_idle(local);
252 goto out;
55de908a 253 }
35f2fce9
MK		 254 }
255
382a103b 256 /* and keep the mutex held until the new chanctx is on the list */
3448c005 257 list_add_rcu(&ctx->list, &local->chanctx_list);
d01a1e65 258
382a103b 259 out:
fd0f979a
JB		 260 mutex_unlock(&local->mtx);
261
d01a1e65
MK		 262 return ctx;
263}
264
265static void ieee80211_free_chanctx(struct ieee80211_local *local,
266 struct ieee80211_chanctx *ctx)
267{
e4746851 268 bool check_single_channel = false;
d01a1e65
MK		 269 lockdep_assert_held(&local->chanctx_mtx);
270
271 WARN_ON_ONCE(ctx->refcount != 0);
272
55de908a 273 if (!local->use_chanctx) {
675a0b04
KB		 274 struct cfg80211_chan_def *chandef = &local->_oper_chandef;
275 chandef->width = NL80211_CHAN_WIDTH_20_NOHT;
276 chandef->center_freq1 = chandef->chan->center_freq;
277 chandef->center_freq2 = 0;
e4746851
SW		 278
279 /* NOTE: Disabling radar is only valid here for
280 * single channel context. To be sure, check it ...
281 */
282 if (local->hw.conf.radar_enabled)
283 check_single_channel = true;
284 local->hw.conf.radar_enabled = false;
285
55de908a
JB		 286 ieee80211_hw_config(local, 0);
287 } else {
288 drv_remove_chanctx(local, ctx);
289 }
35f2fce9 290
3448c005 291 list_del_rcu(&ctx->list);
d01a1e65 292 kfree_rcu(ctx, rcu_head);
fd0f979a 293
e4746851
SW		 294 /* throw a warning if this wasn't the only channel context. */
295 WARN_ON(check_single_channel && !list_empty(&local->chanctx_list));
296
fd0f979a
JB		 297 mutex_lock(&local->mtx);
298 ieee80211_recalc_idle(local);
299 mutex_unlock(&local->mtx);
d01a1e65
MK		 300}
301
302static int ieee80211_assign_vif_chanctx(struct ieee80211_sub_if_data *sdata,
303 struct ieee80211_chanctx *ctx)
304{
35f2fce9
MK		 305 struct ieee80211_local *local = sdata->local;
306 int ret;
d01a1e65
MK		 307
308 lockdep_assert_held(&local->chanctx_mtx);
309
35f2fce9
MK		 310 ret = drv_assign_vif_chanctx(local, sdata, ctx);
311 if (ret)
312 return ret;
313
d01a1e65
MK		 314 rcu_assign_pointer(sdata->vif.chanctx_conf, &ctx->conf);
315 ctx->refcount++;
316
1ea6f9c0 317 ieee80211_recalc_txpower(sdata);
21f659bf 318 ieee80211_recalc_chanctx_min_def(local, ctx);
fd0f979a 319 sdata->vif.bss_conf.idle = false;
5bbe754d
JB		 320
321 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE &&
322 sdata->vif.type != NL80211_IFTYPE_MONITOR)
323 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_IDLE);
1ea6f9c0 324
d01a1e65
MK		 325 return 0;
326}
327
4bf88530
JB		 328static void ieee80211_recalc_chanctx_chantype(struct ieee80211_local *local,
329 struct ieee80211_chanctx *ctx)
e89a96f5
MK		 330{
331 struct ieee80211_chanctx_conf *conf = &ctx->conf;
332 struct ieee80211_sub_if_data *sdata;
4bf88530 333 const struct cfg80211_chan_def *compat = NULL;
e89a96f5
MK		 334
335 lockdep_assert_held(&local->chanctx_mtx);
336
337 rcu_read_lock();
338 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
4bf88530 339
e89a96f5
MK		 340 if (!ieee80211_sdata_running(sdata))
341 continue;
342 if (rcu_access_pointer(sdata->vif.chanctx_conf) != conf)
343 continue;
344
4bf88530
JB		 345 if (!compat)
346 compat = &sdata->vif.bss_conf.chandef;
347
348 compat = cfg80211_chandef_compatible(
349 &sdata->vif.bss_conf.chandef, compat);
350 if (!compat)
351 break;
e89a96f5
MK		 352 }
353 rcu_read_unlock();
354
4bf88530
JB		 355 if (WARN_ON_ONCE(!compat))
356 return;
e89a96f5 357
18942d3b 358 ieee80211_change_chanctx(local, ctx, compat);
e89a96f5
MK		 359}
360
d01a1e65
MK		 361static void ieee80211_unassign_vif_chanctx(struct ieee80211_sub_if_data *sdata,
362 struct ieee80211_chanctx *ctx)
363{
35f2fce9 364 struct ieee80211_local *local = sdata->local;
d01a1e65
MK		 365
366 lockdep_assert_held(&local->chanctx_mtx);
367
368 ctx->refcount--;
369 rcu_assign_pointer(sdata->vif.chanctx_conf, NULL);
35f2fce9 370
fd0f979a 371 sdata->vif.bss_conf.idle = true;
5bbe754d
JB		 372
373 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE &&
374 sdata->vif.type != NL80211_IFTYPE_MONITOR)
375 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_IDLE);
fd0f979a 376
35f2fce9 377 drv_unassign_vif_chanctx(local, sdata, ctx);
e89a96f5 378
04ecd257 379 if (ctx->refcount > 0) {
e89a96f5 380 ieee80211_recalc_chanctx_chantype(sdata->local, ctx);
04ecd257 381 ieee80211_recalc_smps_chanctx(local, ctx);
164eb02d 382 ieee80211_recalc_radar_chanctx(local, ctx);
21f659bf 383 ieee80211_recalc_chanctx_min_def(local, ctx);
04ecd257 384 }
d01a1e65
MK		 385}
386
387static void __ieee80211_vif_release_channel(struct ieee80211_sub_if_data *sdata)
388{
389 struct ieee80211_local *local = sdata->local;
390 struct ieee80211_chanctx_conf *conf;
391 struct ieee80211_chanctx *ctx;
392
393 lockdep_assert_held(&local->chanctx_mtx);
394
395 conf = rcu_dereference_protected(sdata->vif.chanctx_conf,
396 lockdep_is_held(&local->chanctx_mtx));
397 if (!conf)
398 return;
399
400 ctx = container_of(conf, struct ieee80211_chanctx, conf);
401
402 ieee80211_unassign_vif_chanctx(sdata, ctx);
403 if (ctx->refcount == 0)
404 ieee80211_free_chanctx(local, ctx);
405}
406
164eb02d
SW		 407void ieee80211_recalc_radar_chanctx(struct ieee80211_local *local,
408 struct ieee80211_chanctx *chanctx)
409{
e4746851 410 bool radar_enabled;
164eb02d
SW		 411
412 lockdep_assert_held(&local->chanctx_mtx);
413
e4746851 414 radar_enabled = ieee80211_is_radar_required(local);
164eb02d
SW		 415
416 if (radar_enabled == chanctx->conf.radar_enabled)
417 return;
418
419 chanctx->conf.radar_enabled = radar_enabled;
420 local->radar_detect_enabled = chanctx->conf.radar_enabled;
421
422 if (!local->use_chanctx) {
423 local->hw.conf.radar_enabled = chanctx->conf.radar_enabled;
424 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL);
425 }
426
427 drv_change_chanctx(local, chanctx, IEEE80211_CHANCTX_CHANGE_RADAR);
428}
429
04ecd257
JB		 430void ieee80211_recalc_smps_chanctx(struct ieee80211_local *local,
431 struct ieee80211_chanctx *chanctx)
432{
433 struct ieee80211_sub_if_data *sdata;
434 u8 rx_chains_static, rx_chains_dynamic;
435
436 lockdep_assert_held(&local->chanctx_mtx);
437
438 rx_chains_static = 1;
439 rx_chains_dynamic = 1;
440
441 rcu_read_lock();
442 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
443 u8 needed_static, needed_dynamic;
444
445 if (!ieee80211_sdata_running(sdata))
446 continue;
447
448 if (rcu_access_pointer(sdata->vif.chanctx_conf) !=
449 &chanctx->conf)
450 continue;
451
452 switch (sdata->vif.type) {
453 case NL80211_IFTYPE_P2P_DEVICE:
454 continue;
455 case NL80211_IFTYPE_STATION:
456 if (!sdata->u.mgd.associated)
457 continue;
458 break;
459 case NL80211_IFTYPE_AP_VLAN:
460 continue;
461 case NL80211_IFTYPE_AP:
462 case NL80211_IFTYPE_ADHOC:
463 case NL80211_IFTYPE_WDS:
464 case NL80211_IFTYPE_MESH_POINT:
465 break;
466 default:
467 WARN_ON_ONCE(1);
468 }
469
470 switch (sdata->smps_mode) {
471 default:
472 WARN_ONCE(1, "Invalid SMPS mode %d\n",
473 sdata->smps_mode);
474 /* fall through */
475 case IEEE80211_SMPS_OFF:
476 needed_static = sdata->needed_rx_chains;
477 needed_dynamic = sdata->needed_rx_chains;
478 break;
479 case IEEE80211_SMPS_DYNAMIC:
480 needed_static = 1;
481 needed_dynamic = sdata->needed_rx_chains;
482 break;
483 case IEEE80211_SMPS_STATIC:
484 needed_static = 1;
485 needed_dynamic = 1;
486 break;
487 }
488
489 rx_chains_static = max(rx_chains_static, needed_static);
490 rx_chains_dynamic = max(rx_chains_dynamic, needed_dynamic);
491 }
492 rcu_read_unlock();
493
494 if (!local->use_chanctx) {
495 if (rx_chains_static > 1)
496 local->smps_mode = IEEE80211_SMPS_OFF;
497 else if (rx_chains_dynamic > 1)
498 local->smps_mode = IEEE80211_SMPS_DYNAMIC;
499 else
500 local->smps_mode = IEEE80211_SMPS_STATIC;
501 ieee80211_hw_config(local, 0);
502 }
503
504 if (rx_chains_static == chanctx->conf.rx_chains_static &&
505 rx_chains_dynamic == chanctx->conf.rx_chains_dynamic)
506 return;
507
508 chanctx->conf.rx_chains_static = rx_chains_static;
509 chanctx->conf.rx_chains_dynamic = rx_chains_dynamic;
510 drv_change_chanctx(local, chanctx, IEEE80211_CHANCTX_CHANGE_RX_CHAINS);
511}
512
d01a1e65 513int ieee80211_vif_use_channel(struct ieee80211_sub_if_data *sdata,
4bf88530 514 const struct cfg80211_chan_def *chandef,
d01a1e65
MK		 515 enum ieee80211_chanctx_mode mode)
516{
517 struct ieee80211_local *local = sdata->local;
518 struct ieee80211_chanctx *ctx;
519 int ret;
520
55de908a
JB		 521 WARN_ON(sdata->dev && netif_carrier_ok(sdata->dev));
522
d01a1e65
MK		 523 mutex_lock(&local->chanctx_mtx);
524 __ieee80211_vif_release_channel(sdata);
525
4bf88530 526 ctx = ieee80211_find_chanctx(local, chandef, mode);
d01a1e65 527 if (!ctx)
4bf88530 528 ctx = ieee80211_new_chanctx(local, chandef, mode);
d01a1e65
MK		 529 if (IS_ERR(ctx)) {
530 ret = PTR_ERR(ctx);
531 goto out;
532 }
533
4bf88530 534 sdata->vif.bss_conf.chandef = *chandef;
55de908a 535
d01a1e65
MK		 536 ret = ieee80211_assign_vif_chanctx(sdata, ctx);
537 if (ret) {
538 /* if assign fails refcount stays the same */
539 if (ctx->refcount == 0)
540 ieee80211_free_chanctx(local, ctx);
541 goto out;
542 }
543
04ecd257 544 ieee80211_recalc_smps_chanctx(local, ctx);
164eb02d 545 ieee80211_recalc_radar_chanctx(local, ctx);
d01a1e65
MK		 546 out:
547 mutex_unlock(&local->chanctx_mtx);
548 return ret;
549}
550
73da7d5b 551int ieee80211_vif_change_channel(struct ieee80211_sub_if_data *sdata,
73da7d5b
SW		 552 u32 *changed)
553{
554 struct ieee80211_local *local = sdata->local;
555 struct ieee80211_chanctx_conf *conf;
556 struct ieee80211_chanctx *ctx;
33787fc4 557 const struct cfg80211_chan_def *chandef = &sdata->csa_chandef;
73da7d5b
SW		 558 int ret;
559 u32 chanctx_changed = 0;
560
561 /* should never be called if not performing a channel switch. */
562 if (WARN_ON(!sdata->vif.csa_active))
563 return -EINVAL;
564
565 if (!cfg80211_chandef_usable(sdata->local->hw.wiphy, chandef,
566 IEEE80211_CHAN_DISABLED))
567 return -EINVAL;
568
569 mutex_lock(&local->chanctx_mtx);
570 conf = rcu_dereference_protected(sdata->vif.chanctx_conf,
571 lockdep_is_held(&local->chanctx_mtx));
572 if (!conf) {
573 ret = -EINVAL;
574 goto out;
575 }
576
577 ctx = container_of(conf, struct ieee80211_chanctx, conf);
578 if (ctx->refcount != 1) {
579 ret = -EINVAL;
580 goto out;
581 }
582
583 if (sdata->vif.bss_conf.chandef.width != chandef->width) {
584 chanctx_changed = IEEE80211_CHANCTX_CHANGE_WIDTH;
585 *changed |= BSS_CHANGED_BANDWIDTH;
586 }
587
588 sdata->vif.bss_conf.chandef = *chandef;
589 ctx->conf.def = *chandef;
590
591 chanctx_changed |= IEEE80211_CHANCTX_CHANGE_CHANNEL;
592 drv_change_chanctx(local, ctx, chanctx_changed);
593
73da7d5b
SW		 594 ieee80211_recalc_chanctx_chantype(local, ctx);
595 ieee80211_recalc_smps_chanctx(local, ctx);
596 ieee80211_recalc_radar_chanctx(local, ctx);
21f659bf 597 ieee80211_recalc_chanctx_min_def(local, ctx);
73da7d5b
SW		 598
599 ret = 0;
600 out:
601 mutex_unlock(&local->chanctx_mtx);
602 return ret;
603}
604
2c9b7359
JB		 605int ieee80211_vif_change_bandwidth(struct ieee80211_sub_if_data *sdata,
606 const struct cfg80211_chan_def *chandef,
607 u32 *changed)
608{
609 struct ieee80211_local *local = sdata->local;
610 struct ieee80211_chanctx_conf *conf;
611 struct ieee80211_chanctx *ctx;
612 int ret;
613
614 if (!cfg80211_chandef_usable(sdata->local->hw.wiphy, chandef,
615 IEEE80211_CHAN_DISABLED))
616 return -EINVAL;
617
618 mutex_lock(&local->chanctx_mtx);
619 if (cfg80211_chandef_identical(chandef, &sdata->vif.bss_conf.chandef)) {
620 ret = 0;
621 goto out;
622 }
623
624 if (chandef->width == NL80211_CHAN_WIDTH_20_NOHT ||
625 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_20_NOHT) {
626 ret = -EINVAL;
627 goto out;
628 }
629
630 conf = rcu_dereference_protected(sdata->vif.chanctx_conf,
631 lockdep_is_held(&local->chanctx_mtx));
632 if (!conf) {
633 ret = -EINVAL;
634 goto out;
635 }
636
637 ctx = container_of(conf, struct ieee80211_chanctx, conf);
638 if (!cfg80211_chandef_compatible(&conf->def, chandef)) {
639 ret = -EINVAL;
640 goto out;
641 }
642
643 sdata->vif.bss_conf.chandef = *chandef;
644
645 ieee80211_recalc_chanctx_chantype(local, ctx);
646
647 *changed |= BSS_CHANGED_BANDWIDTH;
648 ret = 0;
649 out:
650 mutex_unlock(&local->chanctx_mtx);
651 return ret;
652}
653
d01a1e65
MK		 654void ieee80211_vif_release_channel(struct ieee80211_sub_if_data *sdata)
655{
55de908a
JB		 656 WARN_ON(sdata->dev && netif_carrier_ok(sdata->dev));
657
d01a1e65
MK		 658 mutex_lock(&sdata->local->chanctx_mtx);
659 __ieee80211_vif_release_channel(sdata);
660 mutex_unlock(&sdata->local->chanctx_mtx);
661}
3448c005 662
4d76d21b
JB		 663void ieee80211_vif_vlan_copy_chanctx(struct ieee80211_sub_if_data *sdata)
664{
665 struct ieee80211_local *local = sdata->local;
666 struct ieee80211_sub_if_data *ap;
667 struct ieee80211_chanctx_conf *conf;
668
669 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_AP_VLAN || !sdata->bss))
670 return;
671
672 ap = container_of(sdata->bss, struct ieee80211_sub_if_data, u.ap);
673
674 mutex_lock(&local->chanctx_mtx);
675
676 conf = rcu_dereference_protected(ap->vif.chanctx_conf,
677 lockdep_is_held(&local->chanctx_mtx));
678 rcu_assign_pointer(sdata->vif.chanctx_conf, conf);
679 mutex_unlock(&local->chanctx_mtx);
680}
681
1f4ac5a6
JB		 682void ieee80211_vif_copy_chanctx_to_vlans(struct ieee80211_sub_if_data *sdata,
683 bool clear)
684{
685 struct ieee80211_local *local = sdata->local;
686 struct ieee80211_sub_if_data *vlan;
687 struct ieee80211_chanctx_conf *conf;
688
689 ASSERT_RTNL();
690
691 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_AP))
692 return;
693
694 mutex_lock(&local->chanctx_mtx);
695
696 /*
697 * Check that conf exists, even when clearing this function
698 * must be called with the AP's channel context still there
699 * as it would otherwise cause VLANs to have an invalid
700 * channel context pointer for a while, possibly pointing
701 * to a channel context that has already been freed.
702 */
703 conf = rcu_dereference_protected(sdata->vif.chanctx_conf,
704 lockdep_is_held(&local->chanctx_mtx));
705 WARN_ON(!conf);
706
707 if (clear)
708 conf = NULL;
709
710 list_for_each_entry(vlan, &sdata->u.ap.vlans, u.vlan.list)
711 rcu_assign_pointer(vlan->vif.chanctx_conf, conf);
712
713 mutex_unlock(&local->chanctx_mtx);
714}
715
3448c005
JB		 716void ieee80211_iter_chan_contexts_atomic(
717 struct ieee80211_hw *hw,
718 void (*iter)(struct ieee80211_hw *hw,
719 struct ieee80211_chanctx_conf *chanctx_conf,
720 void *data),
721 void *iter_data)
722{
723 struct ieee80211_local *local = hw_to_local(hw);
724 struct ieee80211_chanctx *ctx;
725
726 rcu_read_lock();
727 list_for_each_entry_rcu(ctx, &local->chanctx_list, list)
8a61af65
JB		 728 if (ctx->driver_present)
729 iter(hw, &ctx->conf, iter_data);
3448c005
JB		 730 rcu_read_unlock();
731}
732EXPORT_SYMBOL_GPL(ieee80211_iter_chan_contexts_atomic);
Linux 6.x block layer and io_uring tree(s)