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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
15static 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
29static 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
43int 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
50static 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
63static 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
69static struct ieee80211_chanctx *
70ieee80211_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.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
83static const struct cfg80211_chan_def *
84ieee80211_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
106static const struct cfg80211_chan_def *
107ieee80211_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
132static const struct cfg80211_chan_def *
133ieee80211_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
150static bool
151ieee80211_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
167static struct ieee80211_chanctx *
168ieee80211_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
196static 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.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
213
214
215
216
217
218
219
220 return NL80211_CHAN_WIDTH_160;
221 default:
222 WARN_ON(1);
223 return NL80211_CHAN_WIDTH_20;
224 }
225}
226
227static enum nl80211_chan_width
228ieee80211_get_max_required_bw(struct ieee80211_sub_if_data *sdata)
229{
230 enum nl80211_chan_width max_bw = NL80211_CHAN_WIDTH_20_NOHT;
231 struct sta_info *sta;
232
233 rcu_read_lock();
234 list_for_each_entry_rcu(sta, &sdata->local->sta_list, list) {
235 if (sdata != sta->sdata &&
236 !(sta->sdata->bss && sta->sdata->bss == sdata->bss))
237 continue;
238
239 max_bw = max(max_bw, ieee80211_get_sta_bw(sta));
240 }
241 rcu_read_unlock();
242
243 return max_bw;
244}
245
246static enum nl80211_chan_width
247ieee80211_get_chanctx_max_required_bw(struct ieee80211_local *local,
248 struct ieee80211_chanctx_conf *conf)
249{
250 struct ieee80211_sub_if_data *sdata;
251 enum nl80211_chan_width max_bw = NL80211_CHAN_WIDTH_20_NOHT;
252
253 rcu_read_lock();
254 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
255 struct ieee80211_vif *vif = &sdata->vif;
256 enum nl80211_chan_width width = NL80211_CHAN_WIDTH_20_NOHT;
257
258 if (!ieee80211_sdata_running(sdata))
259 continue;
260
261 if (rcu_access_pointer(sdata->vif.chanctx_conf) != conf)
262 continue;
263
264 switch (vif->type) {
265 case NL80211_IFTYPE_AP:
266 case NL80211_IFTYPE_AP_VLAN:
267 width = ieee80211_get_max_required_bw(sdata);
268 break;
269 case NL80211_IFTYPE_STATION:
270
271
272
273
274
275 width = max(vif->bss_conf.chandef.width,
276 ieee80211_get_max_required_bw(sdata));
277 break;
278 case NL80211_IFTYPE_P2P_DEVICE:
279 case NL80211_IFTYPE_NAN:
280 continue;
281 case NL80211_IFTYPE_ADHOC:
282 case NL80211_IFTYPE_MESH_POINT:
283 case NL80211_IFTYPE_OCB:
284 width = vif->bss_conf.chandef.width;
285 break;
286 case NL80211_IFTYPE_WDS:
287 case NL80211_IFTYPE_UNSPECIFIED:
288 case NUM_NL80211_IFTYPES:
289 case NL80211_IFTYPE_MONITOR:
290 case NL80211_IFTYPE_P2P_CLIENT:
291 case NL80211_IFTYPE_P2P_GO:
292 WARN_ON_ONCE(1);
293 }
294 max_bw = max(max_bw, width);
295 }
296
297
298 sdata = rcu_dereference(local->monitor_sdata);
299 if (sdata && rcu_access_pointer(sdata->vif.chanctx_conf) == conf)
300 max_bw = max(max_bw, conf->def.width);
301
302 rcu_read_unlock();
303
304 return max_bw;
305}
306
307
308
309
310
311
312static u32 _ieee80211_recalc_chanctx_min_def(struct ieee80211_local *local,
313 struct ieee80211_chanctx *ctx)
314{
315 enum nl80211_chan_width max_bw;
316 struct cfg80211_chan_def min_def;
317
318 lockdep_assert_held(&local->chanctx_mtx);
319
320
321 if (ctx->conf.def.width == NL80211_CHAN_WIDTH_5 ||
322 ctx->conf.def.width == NL80211_CHAN_WIDTH_10 ||
323 ctx->conf.def.width == NL80211_CHAN_WIDTH_1 ||
324 ctx->conf.def.width == NL80211_CHAN_WIDTH_2 ||
325 ctx->conf.def.width == NL80211_CHAN_WIDTH_4 ||
326 ctx->conf.def.width == NL80211_CHAN_WIDTH_8 ||
327 ctx->conf.def.width == NL80211_CHAN_WIDTH_16 ||
328 ctx->conf.radar_enabled) {
329 ctx->conf.min_def = ctx->conf.def;
330 return 0;
331 }
332
333 max_bw = ieee80211_get_chanctx_max_required_bw(local, &ctx->conf);
334
335
336 min_def = ctx->conf.def;
337 while (min_def.width > max_bw)
338 ieee80211_chandef_downgrade(&min_def);
339
340 if (cfg80211_chandef_identical(&ctx->conf.min_def, &min_def))
341 return 0;
342
343 ctx->conf.min_def = min_def;
344 if (!ctx->driver_present)
345 return 0;
346
347 return IEEE80211_CHANCTX_CHANGE_MIN_WIDTH;
348}
349
350
351
352
353static void ieee80211_chan_bw_change(struct ieee80211_local *local,
354 struct ieee80211_chanctx *ctx,
355 bool narrowed)
356{
357 struct sta_info *sta;
358 struct ieee80211_supported_band *sband =
359 local->hw.wiphy->bands[ctx->conf.def.chan->band];
360
361 rcu_read_lock();
362 list_for_each_entry_rcu(sta, &local->sta_list,
363 list) {
364 enum ieee80211_sta_rx_bandwidth new_sta_bw;
365
366 if (!ieee80211_sdata_running(sta->sdata))
367 continue;
368
369 if (rcu_access_pointer(sta->sdata->vif.chanctx_conf) !=
370 &ctx->conf)
371 continue;
372
373 new_sta_bw = ieee80211_sta_cur_vht_bw(sta);
374
375
376 if (new_sta_bw == sta->sta.bandwidth)
377 continue;
378
379
380
381 if ((new_sta_bw < sta->sta.bandwidth) == !narrowed)
382 continue;
383
384 sta->sta.bandwidth = new_sta_bw;
385 rate_control_rate_update(local, sband, sta,
386 IEEE80211_RC_BW_CHANGED);
387 }
388 rcu_read_unlock();
389}
390
391
392
393
394
395
396void ieee80211_recalc_chanctx_min_def(struct ieee80211_local *local,
397 struct ieee80211_chanctx *ctx)
398{
399 u32 changed = _ieee80211_recalc_chanctx_min_def(local, ctx);
400
401 if (!changed)
402 return;
403
404
405 ieee80211_chan_bw_change(local, ctx, true);
406
407 drv_change_chanctx(local, ctx, changed);
408
409
410 ieee80211_chan_bw_change(local, ctx, false);
411}
412
413static void ieee80211_change_chanctx(struct ieee80211_local *local,
414 struct ieee80211_chanctx *ctx,
415 struct ieee80211_chanctx *old_ctx,
416 const struct cfg80211_chan_def *chandef)
417{
418 u32 changed;
419
420
421 switch (chandef->width) {
422 case NL80211_CHAN_WIDTH_20_NOHT:
423 case NL80211_CHAN_WIDTH_20:
424 case NL80211_CHAN_WIDTH_40:
425 case NL80211_CHAN_WIDTH_80:
426 case NL80211_CHAN_WIDTH_80P80:
427 case NL80211_CHAN_WIDTH_160:
428 break;
429 default:
430 WARN_ON(1);
431 }
432
433
434
435
436
437 ieee80211_chan_bw_change(local, old_ctx, true);
438
439 if (cfg80211_chandef_identical(&ctx->conf.def, chandef)) {
440 ieee80211_recalc_chanctx_min_def(local, ctx);
441 return;
442 }
443
444 WARN_ON(!cfg80211_chandef_compatible(&ctx->conf.def, chandef));
445
446 ctx->conf.def = *chandef;
447
448
449 changed = IEEE80211_CHANCTX_CHANGE_WIDTH |
450 _ieee80211_recalc_chanctx_min_def(local, ctx);
451 drv_change_chanctx(local, ctx, changed);
452
453 if (!local->use_chanctx) {
454 local->_oper_chandef = *chandef;
455 ieee80211_hw_config(local, 0);
456 }
457
458
459 ieee80211_chan_bw_change(local, old_ctx, false);
460}
461
462static struct ieee80211_chanctx *
463ieee80211_find_chanctx(struct ieee80211_local *local,
464 const struct cfg80211_chan_def *chandef,
465 enum ieee80211_chanctx_mode mode)
466{
467 struct ieee80211_chanctx *ctx;
468
469 lockdep_assert_held(&local->chanctx_mtx);
470
471 if (mode == IEEE80211_CHANCTX_EXCLUSIVE)
472 return NULL;
473
474 list_for_each_entry(ctx, &local->chanctx_list, list) {
475 const struct cfg80211_chan_def *compat;
476
477 if (ctx->replace_state != IEEE80211_CHANCTX_REPLACE_NONE)
478 continue;
479
480 if (ctx->mode == IEEE80211_CHANCTX_EXCLUSIVE)
481 continue;
482
483 compat = cfg80211_chandef_compatible(&ctx->conf.def, chandef);
484 if (!compat)
485 continue;
486
487 compat = ieee80211_chanctx_reserved_chandef(local, ctx,
488 compat);
489 if (!compat)
490 continue;
491
492 ieee80211_change_chanctx(local, ctx, ctx, compat);
493
494 return ctx;
495 }
496
497 return NULL;
498}
499
500bool ieee80211_is_radar_required(struct ieee80211_local *local)
501{
502 struct ieee80211_sub_if_data *sdata;
503
504 lockdep_assert_held(&local->mtx);
505
506 rcu_read_lock();
507 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
508 if (sdata->radar_required) {
509 rcu_read_unlock();
510 return true;
511 }
512 }
513 rcu_read_unlock();
514
515 return false;
516}
517
518static bool
519ieee80211_chanctx_radar_required(struct ieee80211_local *local,
520 struct ieee80211_chanctx *ctx)
521{
522 struct ieee80211_chanctx_conf *conf = &ctx->conf;
523 struct ieee80211_sub_if_data *sdata;
524 bool required = false;
525
526 lockdep_assert_held(&local->chanctx_mtx);
527 lockdep_assert_held(&local->mtx);
528
529 rcu_read_lock();
530 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
531 if (!ieee80211_sdata_running(sdata))
532 continue;
533 if (rcu_access_pointer(sdata->vif.chanctx_conf) != conf)
534 continue;
535 if (!sdata->radar_required)
536 continue;
537
538 required = true;
539 break;
540 }
541 rcu_read_unlock();
542
543 return required;
544}
545
546static struct ieee80211_chanctx *
547ieee80211_alloc_chanctx(struct ieee80211_local *local,
548 const struct cfg80211_chan_def *chandef,
549 enum ieee80211_chanctx_mode mode)
550{
551 struct ieee80211_chanctx *ctx;
552
553 lockdep_assert_held(&local->chanctx_mtx);
554
555 ctx = kzalloc(sizeof(*ctx) + local->hw.chanctx_data_size, GFP_KERNEL);
556 if (!ctx)
557 return NULL;
558
559 INIT_LIST_HEAD(&ctx->assigned_vifs);
560 INIT_LIST_HEAD(&ctx->reserved_vifs);
561 ctx->conf.def = *chandef;
562 ctx->conf.rx_chains_static = 1;
563 ctx->conf.rx_chains_dynamic = 1;
564 ctx->mode = mode;
565 ctx->conf.radar_enabled = false;
566 ieee80211_recalc_chanctx_min_def(local, ctx);
567
568 return ctx;
569}
570
571static int ieee80211_add_chanctx(struct ieee80211_local *local,
572 struct ieee80211_chanctx *ctx)
573{
574 u32 changed;
575 int err;
576
577 lockdep_assert_held(&local->mtx);
578 lockdep_assert_held(&local->chanctx_mtx);
579
580 if (!local->use_chanctx)
581 local->hw.conf.radar_enabled = ctx->conf.radar_enabled;
582
583
584 changed = ieee80211_idle_off(local);
585 if (changed)
586 ieee80211_hw_config(local, changed);
587
588 if (!local->use_chanctx) {
589 local->_oper_chandef = ctx->conf.def;
590 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL);
591 } else {
592 err = drv_add_chanctx(local, ctx);
593 if (err) {
594 ieee80211_recalc_idle(local);
595 return err;
596 }
597 }
598
599 return 0;
600}
601
602static struct ieee80211_chanctx *
603ieee80211_new_chanctx(struct ieee80211_local *local,
604 const struct cfg80211_chan_def *chandef,
605 enum ieee80211_chanctx_mode mode)
606{
607 struct ieee80211_chanctx *ctx;
608 int err;
609
610 lockdep_assert_held(&local->mtx);
611 lockdep_assert_held(&local->chanctx_mtx);
612
613 ctx = ieee80211_alloc_chanctx(local, chandef, mode);
614 if (!ctx)
615 return ERR_PTR(-ENOMEM);
616
617 err = ieee80211_add_chanctx(local, ctx);
618 if (err) {
619 kfree(ctx);
620 return ERR_PTR(err);
621 }
622
623 list_add_rcu(&ctx->list, &local->chanctx_list);
624 return ctx;
625}
626
627static void ieee80211_del_chanctx(struct ieee80211_local *local,
628 struct ieee80211_chanctx *ctx)
629{
630 lockdep_assert_held(&local->chanctx_mtx);
631
632 if (!local->use_chanctx) {
633 struct cfg80211_chan_def *chandef = &local->_oper_chandef;
634
635
636
637 if (chandef->chan->band == NL80211_BAND_S1GHZ)
638 chandef->width =
639 ieee80211_s1g_channel_width(chandef->chan);
640 else
641 chandef->width = NL80211_CHAN_WIDTH_20_NOHT;
642 chandef->center_freq1 = chandef->chan->center_freq;
643 chandef->freq1_offset = chandef->chan->freq_offset;
644 chandef->center_freq2 = 0;
645
646
647
648
649 WARN_ON(local->hw.conf.radar_enabled &&
650 !list_empty(&local->chanctx_list));
651
652 local->hw.conf.radar_enabled = false;
653
654 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL);
655 } else {
656 drv_remove_chanctx(local, ctx);
657 }
658
659 ieee80211_recalc_idle(local);
660}
661
662static void ieee80211_free_chanctx(struct ieee80211_local *local,
663 struct ieee80211_chanctx *ctx)
664{
665 lockdep_assert_held(&local->chanctx_mtx);
666
667 WARN_ON_ONCE(ieee80211_chanctx_refcount(local, ctx) != 0);
668
669 list_del_rcu(&ctx->list);
670 ieee80211_del_chanctx(local, ctx);
671 kfree_rcu(ctx, rcu_head);
672}
673
674void ieee80211_recalc_chanctx_chantype(struct ieee80211_local *local,
675 struct ieee80211_chanctx *ctx)
676{
677 struct ieee80211_chanctx_conf *conf = &ctx->conf;
678 struct ieee80211_sub_if_data *sdata;
679 const struct cfg80211_chan_def *compat = NULL;
680 struct sta_info *sta;
681
682 lockdep_assert_held(&local->chanctx_mtx);
683
684 rcu_read_lock();
685 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
686
687 if (!ieee80211_sdata_running(sdata))
688 continue;
689 if (rcu_access_pointer(sdata->vif.chanctx_conf) != conf)
690 continue;
691 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
692 continue;
693
694 if (!compat)
695 compat = &sdata->vif.bss_conf.chandef;
696
697 compat = cfg80211_chandef_compatible(
698 &sdata->vif.bss_conf.chandef, compat);
699 if (WARN_ON_ONCE(!compat))
700 break;
701 }
702
703
704 list_for_each_entry_rcu(sta, &local->sta_list, list) {
705 if (!sta->uploaded ||
706 !test_sta_flag(sta, WLAN_STA_TDLS_WIDER_BW) ||
707 !test_sta_flag(sta, WLAN_STA_AUTHORIZED) ||
708 !sta->tdls_chandef.chan)
709 continue;
710
711 compat = cfg80211_chandef_compatible(&sta->tdls_chandef,
712 compat);
713 if (WARN_ON_ONCE(!compat))
714 break;
715 }
716 rcu_read_unlock();
717
718 if (!compat)
719 return;
720
721 ieee80211_change_chanctx(local, ctx, ctx, compat);
722}
723
724static void ieee80211_recalc_radar_chanctx(struct ieee80211_local *local,
725 struct ieee80211_chanctx *chanctx)
726{
727 bool radar_enabled;
728
729 lockdep_assert_held(&local->chanctx_mtx);
730
731 lockdep_assert_held(&local->mtx);
732
733 radar_enabled = ieee80211_chanctx_radar_required(local, chanctx);
734
735 if (radar_enabled == chanctx->conf.radar_enabled)
736 return;
737
738 chanctx->conf.radar_enabled = radar_enabled;
739
740 if (!local->use_chanctx) {
741 local->hw.conf.radar_enabled = chanctx->conf.radar_enabled;
742 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL);
743 }
744
745 drv_change_chanctx(local, chanctx, IEEE80211_CHANCTX_CHANGE_RADAR);
746}
747
748static int ieee80211_assign_vif_chanctx(struct ieee80211_sub_if_data *sdata,
749 struct ieee80211_chanctx *new_ctx)
750{
751 struct ieee80211_local *local = sdata->local;
752 struct ieee80211_chanctx_conf *conf;
753 struct ieee80211_chanctx *curr_ctx = NULL;
754 int ret = 0;
755
756 if (WARN_ON(sdata->vif.type == NL80211_IFTYPE_NAN))
757 return -ENOTSUPP;
758
759 conf = rcu_dereference_protected(sdata->vif.chanctx_conf,
760 lockdep_is_held(&local->chanctx_mtx));
761
762 if (conf) {
763 curr_ctx = container_of(conf, struct ieee80211_chanctx, conf);
764
765 drv_unassign_vif_chanctx(local, sdata, curr_ctx);
766 conf = NULL;
767 list_del(&sdata->assigned_chanctx_list);
768 }
769
770 if (new_ctx) {
771 ret = drv_assign_vif_chanctx(local, sdata, new_ctx);
772 if (ret)
773 goto out;
774
775 conf = &new_ctx->conf;
776 list_add(&sdata->assigned_chanctx_list,
777 &new_ctx->assigned_vifs);
778 }
779
780out:
781 rcu_assign_pointer(sdata->vif.chanctx_conf, conf);
782
783 sdata->vif.bss_conf.idle = !conf;
784
785 if (curr_ctx && ieee80211_chanctx_num_assigned(local, curr_ctx) > 0) {
786 ieee80211_recalc_chanctx_chantype(local, curr_ctx);
787 ieee80211_recalc_smps_chanctx(local, curr_ctx);
788 ieee80211_recalc_radar_chanctx(local, curr_ctx);
789 ieee80211_recalc_chanctx_min_def(local, curr_ctx);
790 }
791
792 if (new_ctx && ieee80211_chanctx_num_assigned(local, new_ctx) > 0) {
793 ieee80211_recalc_txpower(sdata, false);
794 ieee80211_recalc_chanctx_min_def(local, new_ctx);
795 }
796
797 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE &&
798 sdata->vif.type != NL80211_IFTYPE_MONITOR)
799 ieee80211_bss_info_change_notify(sdata,
800 BSS_CHANGED_IDLE);
801
802 ieee80211_check_fast_xmit_iface(sdata);
803
804 return ret;
805}
806
807void ieee80211_recalc_smps_chanctx(struct ieee80211_local *local,
808 struct ieee80211_chanctx *chanctx)
809{
810 struct ieee80211_sub_if_data *sdata;
811 u8 rx_chains_static, rx_chains_dynamic;
812
813 lockdep_assert_held(&local->chanctx_mtx);
814
815 rx_chains_static = 1;
816 rx_chains_dynamic = 1;
817
818 rcu_read_lock();
819 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
820 u8 needed_static, needed_dynamic;
821
822 if (!ieee80211_sdata_running(sdata))
823 continue;
824
825 if (rcu_access_pointer(sdata->vif.chanctx_conf) !=
826 &chanctx->conf)
827 continue;
828
829 switch (sdata->vif.type) {
830 case NL80211_IFTYPE_P2P_DEVICE:
831 case NL80211_IFTYPE_NAN:
832 continue;
833 case NL80211_IFTYPE_STATION:
834 if (!sdata->u.mgd.associated)
835 continue;
836 break;
837 case NL80211_IFTYPE_AP_VLAN:
838 continue;
839 case NL80211_IFTYPE_AP:
840 case NL80211_IFTYPE_ADHOC:
841 case NL80211_IFTYPE_MESH_POINT:
842 case NL80211_IFTYPE_OCB:
843 break;
844 default:
845 WARN_ON_ONCE(1);
846 }
847
848 switch (sdata->smps_mode) {
849 default:
850 WARN_ONCE(1, "Invalid SMPS mode %d\n",
851 sdata->smps_mode);
852 fallthrough;
853 case IEEE80211_SMPS_OFF:
854 needed_static = sdata->needed_rx_chains;
855 needed_dynamic = sdata->needed_rx_chains;
856 break;
857 case IEEE80211_SMPS_DYNAMIC:
858 needed_static = 1;
859 needed_dynamic = sdata->needed_rx_chains;
860 break;
861 case IEEE80211_SMPS_STATIC:
862 needed_static = 1;
863 needed_dynamic = 1;
864 break;
865 }
866
867 rx_chains_static = max(rx_chains_static, needed_static);
868 rx_chains_dynamic = max(rx_chains_dynamic, needed_dynamic);
869 }
870
871
872 sdata = rcu_dereference(local->monitor_sdata);
873 if (sdata &&
874 rcu_access_pointer(sdata->vif.chanctx_conf) == &chanctx->conf)
875 rx_chains_dynamic = rx_chains_static = local->rx_chains;
876
877 rcu_read_unlock();
878
879 if (!local->use_chanctx) {
880 if (rx_chains_static > 1)
881 local->smps_mode = IEEE80211_SMPS_OFF;
882 else if (rx_chains_dynamic > 1)
883 local->smps_mode = IEEE80211_SMPS_DYNAMIC;
884 else
885 local->smps_mode = IEEE80211_SMPS_STATIC;
886 ieee80211_hw_config(local, 0);
887 }
888
889 if (rx_chains_static == chanctx->conf.rx_chains_static &&
890 rx_chains_dynamic == chanctx->conf.rx_chains_dynamic)
891 return;
892
893 chanctx->conf.rx_chains_static = rx_chains_static;
894 chanctx->conf.rx_chains_dynamic = rx_chains_dynamic;
895 drv_change_chanctx(local, chanctx, IEEE80211_CHANCTX_CHANGE_RX_CHAINS);
896}
897
898static void
899__ieee80211_vif_copy_chanctx_to_vlans(struct ieee80211_sub_if_data *sdata,
900 bool clear)
901{
902 struct ieee80211_local *local __maybe_unused = sdata->local;
903 struct ieee80211_sub_if_data *vlan;
904 struct ieee80211_chanctx_conf *conf;
905
906 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_AP))
907 return;
908
909 lockdep_assert_held(&local->mtx);
910
911
912
913
914
915
916
917 conf = rcu_dereference_protected(sdata->vif.chanctx_conf,
918 lockdep_is_held(&local->chanctx_mtx));
919 WARN_ON(!conf);
920
921 if (clear)
922 conf = NULL;
923
924 list_for_each_entry(vlan, &sdata->u.ap.vlans, u.vlan.list)
925 rcu_assign_pointer(vlan->vif.chanctx_conf, conf);
926}
927
928void ieee80211_vif_copy_chanctx_to_vlans(struct ieee80211_sub_if_data *sdata,
929 bool clear)
930{
931 struct ieee80211_local *local = sdata->local;
932
933 mutex_lock(&local->chanctx_mtx);
934
935 __ieee80211_vif_copy_chanctx_to_vlans(sdata, clear);
936
937 mutex_unlock(&local->chanctx_mtx);
938}
939
940int ieee80211_vif_unreserve_chanctx(struct ieee80211_sub_if_data *sdata)
941{
942 struct ieee80211_chanctx *ctx = sdata->reserved_chanctx;
943
944 lockdep_assert_held(&sdata->local->chanctx_mtx);
945
946 if (WARN_ON(!ctx))
947 return -EINVAL;
948
949 list_del(&sdata->reserved_chanctx_list);
950 sdata->reserved_chanctx = NULL;
951
952 if (ieee80211_chanctx_refcount(sdata->local, ctx) == 0) {
953 if (ctx->replace_state == IEEE80211_CHANCTX_REPLACES_OTHER) {
954 if (WARN_ON(!ctx->replace_ctx))
955 return -EINVAL;
956
957 WARN_ON(ctx->replace_ctx->replace_state !=
958 IEEE80211_CHANCTX_WILL_BE_REPLACED);
959 WARN_ON(ctx->replace_ctx->replace_ctx != ctx);
960
961 ctx->replace_ctx->replace_ctx = NULL;
962 ctx->replace_ctx->replace_state =
963 IEEE80211_CHANCTX_REPLACE_NONE;
964
965 list_del_rcu(&ctx->list);
966 kfree_rcu(ctx, rcu_head);
967 } else {
968 ieee80211_free_chanctx(sdata->local, ctx);
969 }
970 }
971
972 return 0;
973}
974
975int ieee80211_vif_reserve_chanctx(struct ieee80211_sub_if_data *sdata,
976 const struct cfg80211_chan_def *chandef,
977 enum ieee80211_chanctx_mode mode,
978 bool radar_required)
979{
980 struct ieee80211_local *local = sdata->local;
981 struct ieee80211_chanctx *new_ctx, *curr_ctx, *ctx;
982
983 lockdep_assert_held(&local->chanctx_mtx);
984
985 curr_ctx = ieee80211_vif_get_chanctx(sdata);
986 if (curr_ctx && local->use_chanctx && !local->ops->switch_vif_chanctx)
987 return -ENOTSUPP;
988
989 new_ctx = ieee80211_find_reservation_chanctx(local, chandef, mode);
990 if (!new_ctx) {
991 if (ieee80211_can_create_new_chanctx(local)) {
992 new_ctx = ieee80211_new_chanctx(local, chandef, mode);
993 if (IS_ERR(new_ctx))
994 return PTR_ERR(new_ctx);
995 } else {
996 if (!curr_ctx ||
997 (curr_ctx->replace_state ==
998 IEEE80211_CHANCTX_WILL_BE_REPLACED) ||
999 !list_empty(&curr_ctx->reserved_vifs)) {
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022 list_for_each_entry(ctx, &local->chanctx_list,
1023 list) {
1024 if (ctx->replace_state !=
1025 IEEE80211_CHANCTX_REPLACE_NONE)
1026 continue;
1027
1028 if (!list_empty(&ctx->reserved_vifs))
1029 continue;
1030
1031 curr_ctx = ctx;
1032 break;
1033 }
1034 }
1035
1036
1037
1038
1039
1040 if (!curr_ctx ||
1041 (curr_ctx->replace_state ==
1042 IEEE80211_CHANCTX_WILL_BE_REPLACED) ||
1043 !list_empty(&curr_ctx->reserved_vifs))
1044 return -EBUSY;
1045
1046 new_ctx = ieee80211_alloc_chanctx(local, chandef, mode);
1047 if (!new_ctx)
1048 return -ENOMEM;
1049
1050 new_ctx->replace_ctx = curr_ctx;
1051 new_ctx->replace_state =
1052 IEEE80211_CHANCTX_REPLACES_OTHER;
1053
1054 curr_ctx->replace_ctx = new_ctx;
1055 curr_ctx->replace_state =
1056 IEEE80211_CHANCTX_WILL_BE_REPLACED;
1057
1058 list_add_rcu(&new_ctx->list, &local->chanctx_list);
1059 }
1060 }
1061
1062 list_add(&sdata->reserved_chanctx_list, &new_ctx->reserved_vifs);
1063 sdata->reserved_chanctx = new_ctx;
1064 sdata->reserved_chandef = *chandef;
1065 sdata->reserved_radar_required = radar_required;
1066 sdata->reserved_ready = false;
1067
1068 return 0;
1069}
1070
1071static void
1072ieee80211_vif_chanctx_reservation_complete(struct ieee80211_sub_if_data *sdata)
1073{
1074 switch (sdata->vif.type) {
1075 case NL80211_IFTYPE_ADHOC:
1076 case NL80211_IFTYPE_AP:
1077 case NL80211_IFTYPE_MESH_POINT:
1078 case NL80211_IFTYPE_OCB:
1079 ieee80211_queue_work(&sdata->local->hw,
1080 &sdata->csa_finalize_work);
1081 break;
1082 case NL80211_IFTYPE_STATION:
1083 ieee80211_queue_work(&sdata->local->hw,
1084 &sdata->u.mgd.chswitch_work);
1085 break;
1086 case NL80211_IFTYPE_UNSPECIFIED:
1087 case NL80211_IFTYPE_AP_VLAN:
1088 case NL80211_IFTYPE_WDS:
1089 case NL80211_IFTYPE_MONITOR:
1090 case NL80211_IFTYPE_P2P_CLIENT:
1091 case NL80211_IFTYPE_P2P_GO:
1092 case NL80211_IFTYPE_P2P_DEVICE:
1093 case NL80211_IFTYPE_NAN:
1094 case NUM_NL80211_IFTYPES:
1095 WARN_ON(1);
1096 break;
1097 }
1098}
1099
1100static void
1101ieee80211_vif_update_chandef(struct ieee80211_sub_if_data *sdata,
1102 const struct cfg80211_chan_def *chandef)
1103{
1104 struct ieee80211_sub_if_data *vlan;
1105
1106 sdata->vif.bss_conf.chandef = *chandef;
1107
1108 if (sdata->vif.type != NL80211_IFTYPE_AP)
1109 return;
1110
1111 list_for_each_entry(vlan, &sdata->u.ap.vlans, u.vlan.list)
1112 vlan->vif.bss_conf.chandef = *chandef;
1113}
1114
1115static int
1116ieee80211_vif_use_reserved_reassign(struct ieee80211_sub_if_data *sdata)
1117{
1118 struct ieee80211_local *local = sdata->local;
1119 struct ieee80211_vif_chanctx_switch vif_chsw[1] = {};
1120 struct ieee80211_chanctx *old_ctx, *new_ctx;
1121 const struct cfg80211_chan_def *chandef;
1122 u32 changed = 0;
1123 int err;
1124
1125 lockdep_assert_held(&local->mtx);
1126 lockdep_assert_held(&local->chanctx_mtx);
1127
1128 new_ctx = sdata->reserved_chanctx;
1129 old_ctx = ieee80211_vif_get_chanctx(sdata);
1130
1131 if (WARN_ON(!sdata->reserved_ready))
1132 return -EBUSY;
1133
1134 if (WARN_ON(!new_ctx))
1135 return -EINVAL;
1136
1137 if (WARN_ON(!old_ctx))
1138 return -EINVAL;
1139
1140 if (WARN_ON(new_ctx->replace_state ==
1141 IEEE80211_CHANCTX_REPLACES_OTHER))
1142 return -EINVAL;
1143
1144 chandef = ieee80211_chanctx_non_reserved_chandef(local, new_ctx,
1145 &sdata->reserved_chandef);
1146 if (WARN_ON(!chandef))
1147 return -EINVAL;
1148
1149 if (sdata->vif.bss_conf.chandef.width != sdata->reserved_chandef.width)
1150 changed = BSS_CHANGED_BANDWIDTH;
1151
1152 ieee80211_vif_update_chandef(sdata, &sdata->reserved_chandef);
1153
1154 ieee80211_change_chanctx(local, new_ctx, old_ctx, chandef);
1155
1156 vif_chsw[0].vif = &sdata->vif;
1157 vif_chsw[0].old_ctx = &old_ctx->conf;
1158 vif_chsw[0].new_ctx = &new_ctx->conf;
1159
1160 list_del(&sdata->reserved_chanctx_list);
1161 sdata->reserved_chanctx = NULL;
1162
1163 err = drv_switch_vif_chanctx(local, vif_chsw, 1,
1164 CHANCTX_SWMODE_REASSIGN_VIF);
1165 if (err) {
1166 if (ieee80211_chanctx_refcount(local, new_ctx) == 0)
1167 ieee80211_free_chanctx(local, new_ctx);
1168
1169 goto out;
1170 }
1171
1172 list_move(&sdata->assigned_chanctx_list, &new_ctx->assigned_vifs);
1173 rcu_assign_pointer(sdata->vif.chanctx_conf, &new_ctx->conf);
1174
1175 if (sdata->vif.type == NL80211_IFTYPE_AP)
1176 __ieee80211_vif_copy_chanctx_to_vlans(sdata, false);
1177
1178 ieee80211_check_fast_xmit_iface(sdata);
1179
1180 if (ieee80211_chanctx_refcount(local, old_ctx) == 0)
1181 ieee80211_free_chanctx(local, old_ctx);
1182
1183 ieee80211_recalc_chanctx_min_def(local, new_ctx);
1184 ieee80211_recalc_smps_chanctx(local, new_ctx);
1185 ieee80211_recalc_radar_chanctx(local, new_ctx);
1186
1187 if (changed)
1188 ieee80211_bss_info_change_notify(sdata, changed);
1189
1190out:
1191 ieee80211_vif_chanctx_reservation_complete(sdata);
1192 return err;
1193}
1194
1195static int
1196ieee80211_vif_use_reserved_assign(struct ieee80211_sub_if_data *sdata)
1197{
1198 struct ieee80211_local *local = sdata->local;
1199 struct ieee80211_chanctx *old_ctx, *new_ctx;
1200 const struct cfg80211_chan_def *chandef;
1201 int err;
1202
1203 old_ctx = ieee80211_vif_get_chanctx(sdata);
1204 new_ctx = sdata->reserved_chanctx;
1205
1206 if (WARN_ON(!sdata->reserved_ready))
1207 return -EINVAL;
1208
1209 if (WARN_ON(old_ctx))
1210 return -EINVAL;
1211
1212 if (WARN_ON(!new_ctx))
1213 return -EINVAL;
1214
1215 if (WARN_ON(new_ctx->replace_state ==
1216 IEEE80211_CHANCTX_REPLACES_OTHER))
1217 return -EINVAL;
1218
1219 chandef = ieee80211_chanctx_non_reserved_chandef(local, new_ctx,
1220 &sdata->reserved_chandef);
1221 if (WARN_ON(!chandef))
1222 return -EINVAL;
1223
1224 ieee80211_change_chanctx(local, new_ctx, new_ctx, chandef);
1225
1226 list_del(&sdata->reserved_chanctx_list);
1227 sdata->reserved_chanctx = NULL;
1228
1229 err = ieee80211_assign_vif_chanctx(sdata, new_ctx);
1230 if (err) {
1231 if (ieee80211_chanctx_refcount(local, new_ctx) == 0)
1232 ieee80211_free_chanctx(local, new_ctx);
1233
1234 goto out;
1235 }
1236
1237out:
1238 ieee80211_vif_chanctx_reservation_complete(sdata);
1239 return err;
1240}
1241
1242static bool
1243ieee80211_vif_has_in_place_reservation(struct ieee80211_sub_if_data *sdata)
1244{
1245 struct ieee80211_chanctx *old_ctx, *new_ctx;
1246
1247 lockdep_assert_held(&sdata->local->chanctx_mtx);
1248
1249 new_ctx = sdata->reserved_chanctx;
1250 old_ctx = ieee80211_vif_get_chanctx(sdata);
1251
1252 if (!old_ctx)
1253 return false;
1254
1255 if (WARN_ON(!new_ctx))
1256 return false;
1257
1258 if (old_ctx->replace_state != IEEE80211_CHANCTX_WILL_BE_REPLACED)
1259 return false;
1260
1261 if (new_ctx->replace_state != IEEE80211_CHANCTX_REPLACES_OTHER)
1262 return false;
1263
1264 return true;
1265}
1266
1267static int ieee80211_chsw_switch_hwconf(struct ieee80211_local *local,
1268 struct ieee80211_chanctx *new_ctx)
1269{
1270 const struct cfg80211_chan_def *chandef;
1271
1272 lockdep_assert_held(&local->mtx);
1273 lockdep_assert_held(&local->chanctx_mtx);
1274
1275 chandef = ieee80211_chanctx_reserved_chandef(local, new_ctx, NULL);
1276 if (WARN_ON(!chandef))
1277 return -EINVAL;
1278
1279 local->hw.conf.radar_enabled = new_ctx->conf.radar_enabled;
1280 local->_oper_chandef = *chandef;
1281 ieee80211_hw_config(local, 0);
1282
1283 return 0;
1284}
1285
1286static int ieee80211_chsw_switch_vifs(struct ieee80211_local *local,
1287 int n_vifs)
1288{
1289 struct ieee80211_vif_chanctx_switch *vif_chsw;
1290 struct ieee80211_sub_if_data *sdata;
1291 struct ieee80211_chanctx *ctx, *old_ctx;
1292 int i, err;
1293
1294 lockdep_assert_held(&local->mtx);
1295 lockdep_assert_held(&local->chanctx_mtx);
1296
1297 vif_chsw = kcalloc(n_vifs, sizeof(vif_chsw[0]), GFP_KERNEL);
1298 if (!vif_chsw)
1299 return -ENOMEM;
1300
1301 i = 0;
1302 list_for_each_entry(ctx, &local->chanctx_list, list) {
1303 if (ctx->replace_state != IEEE80211_CHANCTX_REPLACES_OTHER)
1304 continue;
1305
1306 if (WARN_ON(!ctx->replace_ctx)) {
1307 err = -EINVAL;
1308 goto out;
1309 }
1310
1311 list_for_each_entry(sdata, &ctx->reserved_vifs,
1312 reserved_chanctx_list) {
1313 if (!ieee80211_vif_has_in_place_reservation(
1314 sdata))
1315 continue;
1316
1317 old_ctx = ieee80211_vif_get_chanctx(sdata);
1318 vif_chsw[i].vif = &sdata->vif;
1319 vif_chsw[i].old_ctx = &old_ctx->conf;
1320 vif_chsw[i].new_ctx = &ctx->conf;
1321
1322 i++;
1323 }
1324 }
1325
1326 err = drv_switch_vif_chanctx(local, vif_chsw, n_vifs,
1327 CHANCTX_SWMODE_SWAP_CONTEXTS);
1328
1329out:
1330 kfree(vif_chsw);
1331 return err;
1332}
1333
1334static int ieee80211_chsw_switch_ctxs(struct ieee80211_local *local)
1335{
1336 struct ieee80211_chanctx *ctx;
1337 int err;
1338
1339 lockdep_assert_held(&local->mtx);
1340 lockdep_assert_held(&local->chanctx_mtx);
1341
1342 list_for_each_entry(ctx, &local->chanctx_list, list) {
1343 if (ctx->replace_state != IEEE80211_CHANCTX_REPLACES_OTHER)
1344 continue;
1345
1346 if (!list_empty(&ctx->replace_ctx->assigned_vifs))
1347 continue;
1348
1349 ieee80211_del_chanctx(local, ctx->replace_ctx);
1350 err = ieee80211_add_chanctx(local, ctx);
1351 if (err)
1352 goto err;
1353 }
1354
1355 return 0;
1356
1357err:
1358 WARN_ON(ieee80211_add_chanctx(local, ctx));
1359 list_for_each_entry_continue_reverse(ctx, &local->chanctx_list, list) {
1360 if (ctx->replace_state != IEEE80211_CHANCTX_REPLACES_OTHER)
1361 continue;
1362
1363 if (!list_empty(&ctx->replace_ctx->assigned_vifs))
1364 continue;
1365
1366 ieee80211_del_chanctx(local, ctx);
1367 WARN_ON(ieee80211_add_chanctx(local, ctx->replace_ctx));
1368 }
1369
1370 return err;
1371}
1372
1373static int ieee80211_vif_use_reserved_switch(struct ieee80211_local *local)
1374{
1375 struct ieee80211_sub_if_data *sdata, *sdata_tmp;
1376 struct ieee80211_chanctx *ctx, *ctx_tmp, *old_ctx;
1377 struct ieee80211_chanctx *new_ctx = NULL;
1378 int err, n_assigned, n_reserved, n_ready;
1379 int n_ctx = 0, n_vifs_switch = 0, n_vifs_assign = 0, n_vifs_ctxless = 0;
1380
1381 lockdep_assert_held(&local->mtx);
1382 lockdep_assert_held(&local->chanctx_mtx);
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400 list_for_each_entry(ctx, &local->chanctx_list, list) {
1401 if (ctx->replace_state != IEEE80211_CHANCTX_REPLACES_OTHER)
1402 continue;
1403
1404 if (WARN_ON(!ctx->replace_ctx)) {
1405 err = -EINVAL;
1406 goto err;
1407 }
1408
1409 if (!local->use_chanctx)
1410 new_ctx = ctx;
1411
1412 n_ctx++;
1413
1414 n_assigned = 0;
1415 n_reserved = 0;
1416 n_ready = 0;
1417
1418 list_for_each_entry(sdata, &ctx->replace_ctx->assigned_vifs,
1419 assigned_chanctx_list) {
1420 n_assigned++;
1421 if (sdata->reserved_chanctx) {
1422 n_reserved++;
1423 if (sdata->reserved_ready)
1424 n_ready++;
1425 }
1426 }
1427
1428 if (n_assigned != n_reserved) {
1429 if (n_ready == n_reserved) {
1430 wiphy_info(local->hw.wiphy,
1431 "channel context reservation cannot be finalized because some interfaces aren't switching\n");
1432 err = -EBUSY;
1433 goto err;
1434 }
1435
1436 return -EAGAIN;
1437 }
1438
1439 ctx->conf.radar_enabled = false;
1440 list_for_each_entry(sdata, &ctx->reserved_vifs,
1441 reserved_chanctx_list) {
1442 if (ieee80211_vif_has_in_place_reservation(sdata) &&
1443 !sdata->reserved_ready)
1444 return -EAGAIN;
1445
1446 old_ctx = ieee80211_vif_get_chanctx(sdata);
1447 if (old_ctx) {
1448 if (old_ctx->replace_state ==
1449 IEEE80211_CHANCTX_WILL_BE_REPLACED)
1450 n_vifs_switch++;
1451 else
1452 n_vifs_assign++;
1453 } else {
1454 n_vifs_ctxless++;
1455 }
1456
1457 if (sdata->reserved_radar_required)
1458 ctx->conf.radar_enabled = true;
1459 }
1460 }
1461
1462 if (WARN_ON(n_ctx == 0) ||
1463 WARN_ON(n_vifs_switch == 0 &&
1464 n_vifs_assign == 0 &&
1465 n_vifs_ctxless == 0) ||
1466 WARN_ON(n_ctx > 1 && !local->use_chanctx) ||
1467 WARN_ON(!new_ctx && !local->use_chanctx)) {
1468 err = -EINVAL;
1469 goto err;
1470 }
1471
1472
1473
1474
1475
1476
1477 if (local->use_chanctx) {
1478 if (n_vifs_switch > 0) {
1479 err = ieee80211_chsw_switch_vifs(local, n_vifs_switch);
1480 if (err)
1481 goto err;
1482 }
1483
1484 if (n_vifs_assign > 0 || n_vifs_ctxless > 0) {
1485 err = ieee80211_chsw_switch_ctxs(local);
1486 if (err)
1487 goto err;
1488 }
1489 } else {
1490 err = ieee80211_chsw_switch_hwconf(local, new_ctx);
1491 if (err)
1492 goto err;
1493 }
1494
1495
1496
1497
1498
1499 list_for_each_entry(ctx, &local->chanctx_list, list) {
1500 if (ctx->replace_state != IEEE80211_CHANCTX_REPLACES_OTHER)
1501 continue;
1502
1503 if (WARN_ON(!ctx->replace_ctx)) {
1504 err = -EINVAL;
1505 goto err;
1506 }
1507
1508 list_for_each_entry(sdata, &ctx->reserved_vifs,
1509 reserved_chanctx_list) {
1510 u32 changed = 0;
1511
1512 if (!ieee80211_vif_has_in_place_reservation(sdata))
1513 continue;
1514
1515 rcu_assign_pointer(sdata->vif.chanctx_conf, &ctx->conf);
1516
1517 if (sdata->vif.type == NL80211_IFTYPE_AP)
1518 __ieee80211_vif_copy_chanctx_to_vlans(sdata,
1519 false);
1520
1521 ieee80211_check_fast_xmit_iface(sdata);
1522
1523 sdata->radar_required = sdata->reserved_radar_required;
1524
1525 if (sdata->vif.bss_conf.chandef.width !=
1526 sdata->reserved_chandef.width)
1527 changed = BSS_CHANGED_BANDWIDTH;
1528
1529 ieee80211_vif_update_chandef(sdata, &sdata->reserved_chandef);
1530 if (changed)
1531 ieee80211_bss_info_change_notify(sdata,
1532 changed);
1533
1534 ieee80211_recalc_txpower(sdata, false);
1535 }
1536
1537 ieee80211_recalc_chanctx_chantype(local, ctx);
1538 ieee80211_recalc_smps_chanctx(local, ctx);
1539 ieee80211_recalc_radar_chanctx(local, ctx);
1540 ieee80211_recalc_chanctx_min_def(local, ctx);
1541
1542 list_for_each_entry_safe(sdata, sdata_tmp, &ctx->reserved_vifs,
1543 reserved_chanctx_list) {
1544 if (ieee80211_vif_get_chanctx(sdata) != ctx)
1545 continue;
1546
1547 list_del(&sdata->reserved_chanctx_list);
1548 list_move(&sdata->assigned_chanctx_list,
1549 &ctx->assigned_vifs);
1550 sdata->reserved_chanctx = NULL;
1551
1552 ieee80211_vif_chanctx_reservation_complete(sdata);
1553 }
1554
1555
1556
1557
1558
1559
1560
1561
1562 list_for_each_entry_safe(sdata, sdata_tmp, &ctx->reserved_vifs,
1563 reserved_chanctx_list) {
1564 if (WARN_ON(ieee80211_vif_has_in_place_reservation(
1565 sdata)))
1566 continue;
1567
1568 if (WARN_ON(sdata->reserved_chanctx != ctx))
1569 continue;
1570
1571 if (!sdata->reserved_ready)
1572 continue;
1573
1574 if (ieee80211_vif_get_chanctx(sdata))
1575 err = ieee80211_vif_use_reserved_reassign(
1576 sdata);
1577 else
1578 err = ieee80211_vif_use_reserved_assign(sdata);
1579
1580 if (err) {
1581 sdata_info(sdata,
1582 "failed to finalize (re-)assign reservation (err=%d)\n",
1583 err);
1584 ieee80211_vif_unreserve_chanctx(sdata);
1585 cfg80211_stop_iface(local->hw.wiphy,
1586 &sdata->wdev,
1587 GFP_KERNEL);
1588 }
1589 }
1590 }
1591
1592
1593
1594
1595
1596 list_for_each_entry_safe(ctx, ctx_tmp, &local->chanctx_list, list) {
1597 if (ctx->replace_state != IEEE80211_CHANCTX_WILL_BE_REPLACED)
1598 continue;
1599
1600 ctx->replace_ctx->replace_ctx = NULL;
1601 ctx->replace_ctx->replace_state =
1602 IEEE80211_CHANCTX_REPLACE_NONE;
1603
1604 list_del_rcu(&ctx->list);
1605 kfree_rcu(ctx, rcu_head);
1606 }
1607
1608 return 0;
1609
1610err:
1611 list_for_each_entry(ctx, &local->chanctx_list, list) {
1612 if (ctx->replace_state != IEEE80211_CHANCTX_REPLACES_OTHER)
1613 continue;
1614
1615 list_for_each_entry_safe(sdata, sdata_tmp, &ctx->reserved_vifs,
1616 reserved_chanctx_list) {
1617 ieee80211_vif_unreserve_chanctx(sdata);
1618 ieee80211_vif_chanctx_reservation_complete(sdata);
1619 }
1620 }
1621
1622 return err;
1623}
1624
1625static void __ieee80211_vif_release_channel(struct ieee80211_sub_if_data *sdata)
1626{
1627 struct ieee80211_local *local = sdata->local;
1628 struct ieee80211_chanctx_conf *conf;
1629 struct ieee80211_chanctx *ctx;
1630 bool use_reserved_switch = false;
1631
1632 lockdep_assert_held(&local->chanctx_mtx);
1633
1634 conf = rcu_dereference_protected(sdata->vif.chanctx_conf,
1635 lockdep_is_held(&local->chanctx_mtx));
1636 if (!conf)
1637 return;
1638
1639 ctx = container_of(conf, struct ieee80211_chanctx, conf);
1640
1641 if (sdata->reserved_chanctx) {
1642 if (sdata->reserved_chanctx->replace_state ==
1643 IEEE80211_CHANCTX_REPLACES_OTHER &&
1644 ieee80211_chanctx_num_reserved(local,
1645 sdata->reserved_chanctx) > 1)
1646 use_reserved_switch = true;
1647
1648 ieee80211_vif_unreserve_chanctx(sdata);
1649 }
1650
1651 ieee80211_assign_vif_chanctx(sdata, NULL);
1652 if (ieee80211_chanctx_refcount(local, ctx) == 0)
1653 ieee80211_free_chanctx(local, ctx);
1654
1655 sdata->radar_required = false;
1656
1657
1658 if (use_reserved_switch)
1659 ieee80211_vif_use_reserved_switch(local);
1660}
1661
1662int ieee80211_vif_use_channel(struct ieee80211_sub_if_data *sdata,
1663 const struct cfg80211_chan_def *chandef,
1664 enum ieee80211_chanctx_mode mode)
1665{
1666 struct ieee80211_local *local = sdata->local;
1667 struct ieee80211_chanctx *ctx;
1668 u8 radar_detect_width = 0;
1669 int ret;
1670
1671 lockdep_assert_held(&local->mtx);
1672
1673 WARN_ON(sdata->dev && netif_carrier_ok(sdata->dev));
1674
1675 mutex_lock(&local->chanctx_mtx);
1676
1677 ret = cfg80211_chandef_dfs_required(local->hw.wiphy,
1678 chandef,
1679 sdata->wdev.iftype);
1680 if (ret < 0)
1681 goto out;
1682 if (ret > 0)
1683 radar_detect_width = BIT(chandef->width);
1684
1685 sdata->radar_required = ret;
1686
1687 ret = ieee80211_check_combinations(sdata, chandef, mode,
1688 radar_detect_width);
1689 if (ret < 0)
1690 goto out;
1691
1692 __ieee80211_vif_release_channel(sdata);
1693
1694 ctx = ieee80211_find_chanctx(local, chandef, mode);
1695 if (!ctx)
1696 ctx = ieee80211_new_chanctx(local, chandef, mode);
1697 if (IS_ERR(ctx)) {
1698 ret = PTR_ERR(ctx);
1699 goto out;
1700 }
1701
1702 ieee80211_vif_update_chandef(sdata, chandef);
1703
1704 ret = ieee80211_assign_vif_chanctx(sdata, ctx);
1705 if (ret) {
1706
1707 if (ieee80211_chanctx_refcount(local, ctx) == 0)
1708 ieee80211_free_chanctx(local, ctx);
1709 goto out;
1710 }
1711
1712 ieee80211_recalc_smps_chanctx(local, ctx);
1713 ieee80211_recalc_radar_chanctx(local, ctx);
1714 out:
1715 if (ret)
1716 sdata->radar_required = false;
1717
1718 mutex_unlock(&local->chanctx_mtx);
1719 return ret;
1720}
1721
1722int ieee80211_vif_use_reserved_context(struct ieee80211_sub_if_data *sdata)
1723{
1724 struct ieee80211_local *local = sdata->local;
1725 struct ieee80211_chanctx *new_ctx;
1726 struct ieee80211_chanctx *old_ctx;
1727 int err;
1728
1729 lockdep_assert_held(&local->mtx);
1730 lockdep_assert_held(&local->chanctx_mtx);
1731
1732 new_ctx = sdata->reserved_chanctx;
1733 old_ctx = ieee80211_vif_get_chanctx(sdata);
1734
1735 if (WARN_ON(!new_ctx))
1736 return -EINVAL;
1737
1738 if (WARN_ON(new_ctx->replace_state ==
1739 IEEE80211_CHANCTX_WILL_BE_REPLACED))
1740 return -EINVAL;
1741
1742 if (WARN_ON(sdata->reserved_ready))
1743 return -EINVAL;
1744
1745 sdata->reserved_ready = true;
1746
1747 if (new_ctx->replace_state == IEEE80211_CHANCTX_REPLACE_NONE) {
1748 if (old_ctx)
1749 err = ieee80211_vif_use_reserved_reassign(sdata);
1750 else
1751 err = ieee80211_vif_use_reserved_assign(sdata);
1752
1753 if (err)
1754 return err;
1755 }
1756
1757
1758
1759
1760
1761
1762
1763
1764
1765
1766
1767
1768 if ((old_ctx &&
1769 old_ctx->replace_state == IEEE80211_CHANCTX_WILL_BE_REPLACED) ||
1770 new_ctx->replace_state == IEEE80211_CHANCTX_REPLACES_OTHER) {
1771 err = ieee80211_vif_use_reserved_switch(local);
1772 if (err && err != -EAGAIN) {
1773 if (new_ctx->replace_state ==
1774 IEEE80211_CHANCTX_REPLACES_OTHER)
1775 return err;
1776
1777 wiphy_info(local->hw.wiphy,
1778 "depending in-place reservation failed (err=%d)\n",
1779 err);
1780 }
1781 }
1782
1783 return 0;
1784}
1785
1786int ieee80211_vif_change_bandwidth(struct ieee80211_sub_if_data *sdata,
1787 const struct cfg80211_chan_def *chandef,
1788 u32 *changed)
1789{
1790 struct ieee80211_local *local = sdata->local;
1791 struct ieee80211_chanctx_conf *conf;
1792 struct ieee80211_chanctx *ctx;
1793 const struct cfg80211_chan_def *compat;
1794 int ret;
1795
1796 if (!cfg80211_chandef_usable(sdata->local->hw.wiphy, chandef,
1797 IEEE80211_CHAN_DISABLED))
1798 return -EINVAL;
1799
1800 mutex_lock(&local->chanctx_mtx);
1801 if (cfg80211_chandef_identical(chandef, &sdata->vif.bss_conf.chandef)) {
1802 ret = 0;
1803 goto out;
1804 }
1805
1806 if (chandef->width == NL80211_CHAN_WIDTH_20_NOHT ||
1807 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_20_NOHT) {
1808 ret = -EINVAL;
1809 goto out;
1810 }
1811
1812 conf = rcu_dereference_protected(sdata->vif.chanctx_conf,
1813 lockdep_is_held(&local->chanctx_mtx));
1814 if (!conf) {
1815 ret = -EINVAL;
1816 goto out;
1817 }
1818
1819 ctx = container_of(conf, struct ieee80211_chanctx, conf);
1820
1821 compat = cfg80211_chandef_compatible(&conf->def, chandef);
1822 if (!compat) {
1823 ret = -EINVAL;
1824 goto out;
1825 }
1826
1827 switch (ctx->replace_state) {
1828 case IEEE80211_CHANCTX_REPLACE_NONE:
1829 if (!ieee80211_chanctx_reserved_chandef(local, ctx, compat)) {
1830 ret = -EBUSY;
1831 goto out;
1832 }
1833 break;
1834 case IEEE80211_CHANCTX_WILL_BE_REPLACED:
1835
1836
1837 ret = -EBUSY;
1838 goto out;
1839 case IEEE80211_CHANCTX_REPLACES_OTHER:
1840
1841
1842
1843 WARN_ON(1);
1844 break;
1845 }
1846
1847 ieee80211_vif_update_chandef(sdata, chandef);
1848
1849 ieee80211_recalc_chanctx_chantype(local, ctx);
1850
1851 *changed |= BSS_CHANGED_BANDWIDTH;
1852 ret = 0;
1853 out:
1854 mutex_unlock(&local->chanctx_mtx);
1855 return ret;
1856}
1857
1858void ieee80211_vif_release_channel(struct ieee80211_sub_if_data *sdata)
1859{
1860 WARN_ON(sdata->dev && netif_carrier_ok(sdata->dev));
1861
1862 lockdep_assert_held(&sdata->local->mtx);
1863
1864 mutex_lock(&sdata->local->chanctx_mtx);
1865 __ieee80211_vif_release_channel(sdata);
1866 mutex_unlock(&sdata->local->chanctx_mtx);
1867}
1868
1869void ieee80211_vif_vlan_copy_chanctx(struct ieee80211_sub_if_data *sdata)
1870{
1871 struct ieee80211_local *local = sdata->local;
1872 struct ieee80211_sub_if_data *ap;
1873 struct ieee80211_chanctx_conf *conf;
1874
1875 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_AP_VLAN || !sdata->bss))
1876 return;
1877
1878 ap = container_of(sdata->bss, struct ieee80211_sub_if_data, u.ap);
1879
1880 mutex_lock(&local->chanctx_mtx);
1881
1882 conf = rcu_dereference_protected(ap->vif.chanctx_conf,
1883 lockdep_is_held(&local->chanctx_mtx));
1884 rcu_assign_pointer(sdata->vif.chanctx_conf, conf);
1885 mutex_unlock(&local->chanctx_mtx);
1886}
1887
1888void ieee80211_iter_chan_contexts_atomic(
1889 struct ieee80211_hw *hw,
1890 void (*iter)(struct ieee80211_hw *hw,
1891 struct ieee80211_chanctx_conf *chanctx_conf,
1892 void *data),
1893 void *iter_data)
1894{
1895 struct ieee80211_local *local = hw_to_local(hw);
1896 struct ieee80211_chanctx *ctx;
1897
1898 rcu_read_lock();
1899 list_for_each_entry_rcu(ctx, &local->chanctx_list, list)
1900 if (ctx->driver_present)
1901 iter(hw, &ctx->conf, iter_data);
1902 rcu_read_unlock();
1903}
1904EXPORT_SYMBOL_GPL(ieee80211_iter_chan_contexts_atomic);
1905
