1
2
3
4
5#include <linux/nl80211.h>
6#include <linux/export.h>
7#include <linux/rtnetlink.h>
8#include <net/cfg80211.h>
9#include "ieee80211_i.h"
10#include "driver-ops.h"
11
12static int ieee80211_chanctx_num_assigned(struct ieee80211_local *local,
13 struct ieee80211_chanctx *ctx)
14{
15 struct ieee80211_sub_if_data *sdata;
16 int num = 0;
17
18 lockdep_assert_held(&local->chanctx_mtx);
19
20 list_for_each_entry(sdata, &ctx->assigned_vifs, assigned_chanctx_list)
21 num++;
22
23 return num;
24}
25
26static int ieee80211_chanctx_num_reserved(struct ieee80211_local *local,
27 struct ieee80211_chanctx *ctx)
28{
29 struct ieee80211_sub_if_data *sdata;
30 int num = 0;
31
32 lockdep_assert_held(&local->chanctx_mtx);
33
34 list_for_each_entry(sdata, &ctx->reserved_vifs, reserved_chanctx_list)
35 num++;
36
37 return num;
38}
39
40int ieee80211_chanctx_refcount(struct ieee80211_local *local,
41 struct ieee80211_chanctx *ctx)
42{
43 return ieee80211_chanctx_num_assigned(local, ctx) +
44 ieee80211_chanctx_num_reserved(local, ctx);
45}
46
47static int ieee80211_num_chanctx(struct ieee80211_local *local)
48{
49 struct ieee80211_chanctx *ctx;
50 int num = 0;
51
52 lockdep_assert_held(&local->chanctx_mtx);
53
54 list_for_each_entry(ctx, &local->chanctx_list, list)
55 num++;
56
57 return num;
58}
59
60static bool ieee80211_can_create_new_chanctx(struct ieee80211_local *local)
61{
62 lockdep_assert_held(&local->chanctx_mtx);
63 return ieee80211_num_chanctx(local) < ieee80211_max_num_channels(local);
64}
65
66static struct ieee80211_chanctx *
67ieee80211_vif_get_chanctx(struct ieee80211_sub_if_data *sdata)
68{
69 struct ieee80211_local *local __maybe_unused = sdata->local;
70 struct ieee80211_chanctx_conf *conf;
71
72 conf = rcu_dereference_protected(sdata->vif.chanctx_conf,
73 lockdep_is_held(&local->chanctx_mtx));
74 if (!conf)
75 return NULL;
76
77 return container_of(conf, struct ieee80211_chanctx, conf);
78}
79
80static const struct cfg80211_chan_def *
81ieee80211_chanctx_reserved_chandef(struct ieee80211_local *local,
82 struct ieee80211_chanctx *ctx,
83 const struct cfg80211_chan_def *compat)
84{
85 struct ieee80211_sub_if_data *sdata;
86
87 lockdep_assert_held(&local->chanctx_mtx);
88
89 list_for_each_entry(sdata, &ctx->reserved_vifs,
90 reserved_chanctx_list) {
91 if (!compat)
92 compat = &sdata->reserved_chandef;
93
94 compat = cfg80211_chandef_compatible(&sdata->reserved_chandef,
95 compat);
96 if (!compat)
97 break;
98 }
99
100 return compat;
101}
102
103static const struct cfg80211_chan_def *
104ieee80211_chanctx_non_reserved_chandef(struct ieee80211_local *local,
105 struct ieee80211_chanctx *ctx,
106 const struct cfg80211_chan_def *compat)
107{
108 struct ieee80211_sub_if_data *sdata;
109
110 lockdep_assert_held(&local->chanctx_mtx);
111
112 list_for_each_entry(sdata, &ctx->assigned_vifs,
113 assigned_chanctx_list) {
114 if (sdata->reserved_chanctx != NULL)
115 continue;
116
117 if (!compat)
118 compat = &sdata->vif.bss_conf.chandef;
119
120 compat = cfg80211_chandef_compatible(
121 &sdata->vif.bss_conf.chandef, compat);
122 if (!compat)
123 break;
124 }
125
126 return compat;
127}
128
129static const struct cfg80211_chan_def *
130ieee80211_chanctx_combined_chandef(struct ieee80211_local *local,
131 struct ieee80211_chanctx *ctx,
132 const struct cfg80211_chan_def *compat)
133{
134 lockdep_assert_held(&local->chanctx_mtx);
135
136 compat = ieee80211_chanctx_reserved_chandef(local, ctx, compat);
137 if (!compat)
138 return NULL;
139
140 compat = ieee80211_chanctx_non_reserved_chandef(local, ctx, compat);
141 if (!compat)
142 return NULL;
143
144 return compat;
145}
146
147static bool
148ieee80211_chanctx_can_reserve_chandef(struct ieee80211_local *local,
149 struct ieee80211_chanctx *ctx,
150 const struct cfg80211_chan_def *def)
151{
152 lockdep_assert_held(&local->chanctx_mtx);
153
154 if (ieee80211_chanctx_combined_chandef(local, ctx, def))
155 return true;
156
157 if (!list_empty(&ctx->reserved_vifs) &&
158 ieee80211_chanctx_reserved_chandef(local, ctx, def))
159 return true;
160
161 return false;
162}
163
164static struct ieee80211_chanctx *
165ieee80211_find_reservation_chanctx(struct ieee80211_local *local,
166 const struct cfg80211_chan_def *chandef,
167 enum ieee80211_chanctx_mode mode)
168{
169 struct ieee80211_chanctx *ctx;
170
171 lockdep_assert_held(&local->chanctx_mtx);
172
173 if (mode == IEEE80211_CHANCTX_EXCLUSIVE)
174 return NULL;
175
176 list_for_each_entry(ctx, &local->chanctx_list, list) {
177 if (ctx->replace_state == IEEE80211_CHANCTX_WILL_BE_REPLACED)
178 continue;
179
180 if (ctx->mode == IEEE80211_CHANCTX_EXCLUSIVE)
181 continue;
182
183 if (!ieee80211_chanctx_can_reserve_chandef(local, ctx,
184 chandef))
185 continue;
186
187 return ctx;
188 }
189
190 return NULL;
191}
192
193enum nl80211_chan_width ieee80211_get_sta_bw(struct ieee80211_sta *sta)
194{
195 switch (sta->bandwidth) {
196 case IEEE80211_STA_RX_BW_20:
197 if (sta->ht_cap.ht_supported)
198 return NL80211_CHAN_WIDTH_20;
199 else
200 return NL80211_CHAN_WIDTH_20_NOHT;
201 case IEEE80211_STA_RX_BW_40:
202 return NL80211_CHAN_WIDTH_40;
203 case IEEE80211_STA_RX_BW_80:
204 return NL80211_CHAN_WIDTH_80;
205 case IEEE80211_STA_RX_BW_160:
206
207
208
209
210
211
212
213
214
215 return NL80211_CHAN_WIDTH_160;
216 default:
217 WARN_ON(1);
218 return NL80211_CHAN_WIDTH_20;
219 }
220}
221
222static enum nl80211_chan_width
223ieee80211_get_max_required_bw(struct ieee80211_sub_if_data *sdata)
224{
225 enum nl80211_chan_width max_bw = NL80211_CHAN_WIDTH_20_NOHT;
226 struct sta_info *sta;
227
228 rcu_read_lock();
229 list_for_each_entry_rcu(sta, &sdata->local->sta_list, list) {
230 if (sdata != sta->sdata &&
231 !(sta->sdata->bss && sta->sdata->bss == sdata->bss))
232 continue;
233
234 if (!sta->uploaded)
235 continue;
236
237 max_bw = max(max_bw, ieee80211_get_sta_bw(&sta->sta));
238 }
239 rcu_read_unlock();
240
241 return max_bw;
242}
243
244static enum nl80211_chan_width
245ieee80211_get_chanctx_max_required_bw(struct ieee80211_local *local,
246 struct ieee80211_chanctx_conf *conf)
247{
248 struct ieee80211_sub_if_data *sdata;
249 enum nl80211_chan_width max_bw = NL80211_CHAN_WIDTH_20_NOHT;
250
251 rcu_read_lock();
252 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
253 struct ieee80211_vif *vif = &sdata->vif;
254 enum nl80211_chan_width width = NL80211_CHAN_WIDTH_20_NOHT;
255
256 if (!ieee80211_sdata_running(sdata))
257 continue;
258
259 if (rcu_access_pointer(sdata->vif.chanctx_conf) != conf)
260 continue;
261
262 switch (vif->type) {
263 case NL80211_IFTYPE_AP:
264 case NL80211_IFTYPE_AP_VLAN:
265 width = ieee80211_get_max_required_bw(sdata);
266 break;
267 case NL80211_IFTYPE_STATION:
268
269
270
271
272
273 width = max(vif->bss_conf.chandef.width,
274 ieee80211_get_max_required_bw(sdata));
275 break;
276 case NL80211_IFTYPE_P2P_DEVICE:
277 continue;
278 case NL80211_IFTYPE_ADHOC:
279 case NL80211_IFTYPE_WDS:
280 case NL80211_IFTYPE_MESH_POINT:
281 case NL80211_IFTYPE_OCB:
282 width = vif->bss_conf.chandef.width;
283 break;
284 case NL80211_IFTYPE_UNSPECIFIED:
285 case NUM_NL80211_IFTYPES:
286 case NL80211_IFTYPE_MONITOR:
287 case NL80211_IFTYPE_P2P_CLIENT:
288 case NL80211_IFTYPE_P2P_GO:
289 WARN_ON_ONCE(1);
290 }
291 max_bw = max(max_bw, width);
292 }
293
294
295 sdata = rcu_dereference(local->monitor_sdata);
296 if (sdata && rcu_access_pointer(sdata->vif.chanctx_conf) == conf)
297 max_bw = max(max_bw, conf->def.width);
298
299 rcu_read_unlock();
300
301 return max_bw;
302}
303
304
305
306
307
308
309void ieee80211_recalc_chanctx_min_def(struct ieee80211_local *local,
310 struct ieee80211_chanctx *ctx)
311{
312 enum nl80211_chan_width max_bw;
313 struct cfg80211_chan_def min_def;
314
315 lockdep_assert_held(&local->chanctx_mtx);
316
317
318 if (ctx->conf.def.width == NL80211_CHAN_WIDTH_5 ||
319 ctx->conf.def.width == NL80211_CHAN_WIDTH_10 ||
320 ctx->conf.radar_enabled) {
321 ctx->conf.min_def = ctx->conf.def;
322 return;
323 }
324
325 max_bw = ieee80211_get_chanctx_max_required_bw(local, &ctx->conf);
326
327
328 min_def = ctx->conf.def;
329 while (min_def.width > max_bw)
330 ieee80211_chandef_downgrade(&min_def);
331
332 if (cfg80211_chandef_identical(&ctx->conf.min_def, &min_def))
333 return;
334
335 ctx->conf.min_def = min_def;
336 if (!ctx->driver_present)
337 return;
338
339 drv_change_chanctx(local, ctx, IEEE80211_CHANCTX_CHANGE_MIN_WIDTH);
340}
341
342static void ieee80211_change_chanctx(struct ieee80211_local *local,
343 struct ieee80211_chanctx *ctx,
344 const struct cfg80211_chan_def *chandef)
345{
346 if (cfg80211_chandef_identical(&ctx->conf.def, chandef))
347 return;
348
349 WARN_ON(!cfg80211_chandef_compatible(&ctx->conf.def, chandef));
350
351 ctx->conf.def = *chandef;
352 drv_change_chanctx(local, ctx, IEEE80211_CHANCTX_CHANGE_WIDTH);
353 ieee80211_recalc_chanctx_min_def(local, ctx);
354
355 if (!local->use_chanctx) {
356 local->_oper_chandef = *chandef;
357 ieee80211_hw_config(local, 0);
358 }
359}
360
361static struct ieee80211_chanctx *
362ieee80211_find_chanctx(struct ieee80211_local *local,
363 const struct cfg80211_chan_def *chandef,
364 enum ieee80211_chanctx_mode mode)
365{
366 struct ieee80211_chanctx *ctx;
367
368 lockdep_assert_held(&local->chanctx_mtx);
369
370 if (mode == IEEE80211_CHANCTX_EXCLUSIVE)
371 return NULL;
372
373 list_for_each_entry(ctx, &local->chanctx_list, list) {
374 const struct cfg80211_chan_def *compat;
375
376 if (ctx->replace_state != IEEE80211_CHANCTX_REPLACE_NONE)
377 continue;
378
379 if (ctx->mode == IEEE80211_CHANCTX_EXCLUSIVE)
380 continue;
381
382 compat = cfg80211_chandef_compatible(&ctx->conf.def, chandef);
383 if (!compat)
384 continue;
385
386 compat = ieee80211_chanctx_reserved_chandef(local, ctx,
387 compat);
388 if (!compat)
389 continue;
390
391 ieee80211_change_chanctx(local, ctx, compat);
392
393 return ctx;
394 }
395
396 return NULL;
397}
398
399bool ieee80211_is_radar_required(struct ieee80211_local *local)
400{
401 struct ieee80211_sub_if_data *sdata;
402
403 lockdep_assert_held(&local->mtx);
404
405 rcu_read_lock();
406 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
407 if (sdata->radar_required) {
408 rcu_read_unlock();
409 return true;
410 }
411 }
412 rcu_read_unlock();
413
414 return false;
415}
416
417static bool
418ieee80211_chanctx_radar_required(struct ieee80211_local *local,
419 struct ieee80211_chanctx *ctx)
420{
421 struct ieee80211_chanctx_conf *conf = &ctx->conf;
422 struct ieee80211_sub_if_data *sdata;
423 bool required = false;
424
425 lockdep_assert_held(&local->chanctx_mtx);
426 lockdep_assert_held(&local->mtx);
427
428 rcu_read_lock();
429 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
430 if (!ieee80211_sdata_running(sdata))
431 continue;
432 if (rcu_access_pointer(sdata->vif.chanctx_conf) != conf)
433 continue;
434 if (!sdata->radar_required)
435 continue;
436
437 required = true;
438 break;
439 }
440 rcu_read_unlock();
441
442 return required;
443}
444
445static struct ieee80211_chanctx *
446ieee80211_alloc_chanctx(struct ieee80211_local *local,
447 const struct cfg80211_chan_def *chandef,
448 enum ieee80211_chanctx_mode mode)
449{
450 struct ieee80211_chanctx *ctx;
451
452 lockdep_assert_held(&local->chanctx_mtx);
453
454 ctx = kzalloc(sizeof(*ctx) + local->hw.chanctx_data_size, GFP_KERNEL);
455 if (!ctx)
456 return NULL;
457
458 INIT_LIST_HEAD(&ctx->assigned_vifs);
459 INIT_LIST_HEAD(&ctx->reserved_vifs);
460 ctx->conf.def = *chandef;
461 ctx->conf.rx_chains_static = 1;
462 ctx->conf.rx_chains_dynamic = 1;
463 ctx->mode = mode;
464 ctx->conf.radar_enabled = false;
465 ieee80211_recalc_chanctx_min_def(local, ctx);
466
467 return ctx;
468}
469
470static int ieee80211_add_chanctx(struct ieee80211_local *local,
471 struct ieee80211_chanctx *ctx)
472{
473 u32 changed;
474 int err;
475
476 lockdep_assert_held(&local->mtx);
477 lockdep_assert_held(&local->chanctx_mtx);
478
479 if (!local->use_chanctx)
480 local->hw.conf.radar_enabled = ctx->conf.radar_enabled;
481
482
483 changed = ieee80211_idle_off(local);
484 if (changed)
485 ieee80211_hw_config(local, changed);
486
487 if (!local->use_chanctx) {
488 local->_oper_chandef = ctx->conf.def;
489 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL);
490 } else {
491 err = drv_add_chanctx(local, ctx);
492 if (err) {
493 ieee80211_recalc_idle(local);
494 return err;
495 }
496 }
497
498 return 0;
499}
500
501static struct ieee80211_chanctx *
502ieee80211_new_chanctx(struct ieee80211_local *local,
503 const struct cfg80211_chan_def *chandef,
504 enum ieee80211_chanctx_mode mode)
505{
506 struct ieee80211_chanctx *ctx;
507 int err;
508
509 lockdep_assert_held(&local->mtx);
510 lockdep_assert_held(&local->chanctx_mtx);
511
512 ctx = ieee80211_alloc_chanctx(local, chandef, mode);
513 if (!ctx)
514 return ERR_PTR(-ENOMEM);
515
516 err = ieee80211_add_chanctx(local, ctx);
517 if (err) {
518 kfree(ctx);
519 return ERR_PTR(err);
520 }
521
522 list_add_rcu(&ctx->list, &local->chanctx_list);
523 return ctx;
524}
525
526static void ieee80211_del_chanctx(struct ieee80211_local *local,
527 struct ieee80211_chanctx *ctx)
528{
529 lockdep_assert_held(&local->chanctx_mtx);
530
531 if (!local->use_chanctx) {
532 struct cfg80211_chan_def *chandef = &local->_oper_chandef;
533 chandef->width = NL80211_CHAN_WIDTH_20_NOHT;
534 chandef->center_freq1 = chandef->chan->center_freq;
535 chandef->center_freq2 = 0;
536
537
538
539
540 WARN_ON(local->hw.conf.radar_enabled &&
541 !list_empty(&local->chanctx_list));
542
543 local->hw.conf.radar_enabled = false;
544
545 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL);
546 } else {
547 drv_remove_chanctx(local, ctx);
548 }
549
550 ieee80211_recalc_idle(local);
551}
552
553static void ieee80211_free_chanctx(struct ieee80211_local *local,
554 struct ieee80211_chanctx *ctx)
555{
556 lockdep_assert_held(&local->chanctx_mtx);
557
558 WARN_ON_ONCE(ieee80211_chanctx_refcount(local, ctx) != 0);
559
560 list_del_rcu(&ctx->list);
561 ieee80211_del_chanctx(local, ctx);
562 kfree_rcu(ctx, rcu_head);
563}
564
565void ieee80211_recalc_chanctx_chantype(struct ieee80211_local *local,
566 struct ieee80211_chanctx *ctx)
567{
568 struct ieee80211_chanctx_conf *conf = &ctx->conf;
569 struct ieee80211_sub_if_data *sdata;
570 const struct cfg80211_chan_def *compat = NULL;
571 struct sta_info *sta;
572
573 lockdep_assert_held(&local->chanctx_mtx);
574
575 rcu_read_lock();
576 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
577
578 if (!ieee80211_sdata_running(sdata))
579 continue;
580 if (rcu_access_pointer(sdata->vif.chanctx_conf) != conf)
581 continue;
582 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
583 continue;
584
585 if (!compat)
586 compat = &sdata->vif.bss_conf.chandef;
587
588 compat = cfg80211_chandef_compatible(
589 &sdata->vif.bss_conf.chandef, compat);
590 if (WARN_ON_ONCE(!compat))
591 break;
592 }
593
594
595 list_for_each_entry_rcu(sta, &local->sta_list, list) {
596 if (!sta->uploaded ||
597 !test_sta_flag(sta, WLAN_STA_TDLS_WIDER_BW) ||
598 !test_sta_flag(sta, WLAN_STA_AUTHORIZED) ||
599 !sta->tdls_chandef.chan)
600 continue;
601
602 compat = cfg80211_chandef_compatible(&sta->tdls_chandef,
603 compat);
604 if (WARN_ON_ONCE(!compat))
605 break;
606 }
607 rcu_read_unlock();
608
609 if (!compat)
610 return;
611
612 ieee80211_change_chanctx(local, ctx, compat);
613}
614
615static void ieee80211_recalc_radar_chanctx(struct ieee80211_local *local,
616 struct ieee80211_chanctx *chanctx)
617{
618 bool radar_enabled;
619
620 lockdep_assert_held(&local->chanctx_mtx);
621
622 lockdep_assert_held(&local->mtx);
623
624 radar_enabled = ieee80211_chanctx_radar_required(local, chanctx);
625
626 if (radar_enabled == chanctx->conf.radar_enabled)
627 return;
628
629 chanctx->conf.radar_enabled = radar_enabled;
630
631 if (!local->use_chanctx) {
632 local->hw.conf.radar_enabled = chanctx->conf.radar_enabled;
633 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL);
634 }
635
636 drv_change_chanctx(local, chanctx, IEEE80211_CHANCTX_CHANGE_RADAR);
637}
638
639static int ieee80211_assign_vif_chanctx(struct ieee80211_sub_if_data *sdata,
640 struct ieee80211_chanctx *new_ctx)
641{
642 struct ieee80211_local *local = sdata->local;
643 struct ieee80211_chanctx_conf *conf;
644 struct ieee80211_chanctx *curr_ctx = NULL;
645 int ret = 0;
646
647 conf = rcu_dereference_protected(sdata->vif.chanctx_conf,
648 lockdep_is_held(&local->chanctx_mtx));
649
650 if (conf) {
651 curr_ctx = container_of(conf, struct ieee80211_chanctx, conf);
652
653 drv_unassign_vif_chanctx(local, sdata, curr_ctx);
654 conf = NULL;
655 list_del(&sdata->assigned_chanctx_list);
656 }
657
658 if (new_ctx) {
659 ret = drv_assign_vif_chanctx(local, sdata, new_ctx);
660 if (ret)
661 goto out;
662
663 conf = &new_ctx->conf;
664 list_add(&sdata->assigned_chanctx_list,
665 &new_ctx->assigned_vifs);
666 }
667
668out:
669 rcu_assign_pointer(sdata->vif.chanctx_conf, conf);
670
671 sdata->vif.bss_conf.idle = !conf;
672
673 if (curr_ctx && ieee80211_chanctx_num_assigned(local, curr_ctx) > 0) {
674 ieee80211_recalc_chanctx_chantype(local, curr_ctx);
675 ieee80211_recalc_smps_chanctx(local, curr_ctx);
676 ieee80211_recalc_radar_chanctx(local, curr_ctx);
677 ieee80211_recalc_chanctx_min_def(local, curr_ctx);
678 }
679
680 if (new_ctx && ieee80211_chanctx_num_assigned(local, new_ctx) > 0) {
681 ieee80211_recalc_txpower(sdata, false);
682 ieee80211_recalc_chanctx_min_def(local, new_ctx);
683 }
684
685 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE &&
686 sdata->vif.type != NL80211_IFTYPE_MONITOR)
687 ieee80211_bss_info_change_notify(sdata,
688 BSS_CHANGED_IDLE);
689
690 ieee80211_check_fast_xmit_iface(sdata);
691
692 return ret;
693}
694
695void ieee80211_recalc_smps_chanctx(struct ieee80211_local *local,
696 struct ieee80211_chanctx *chanctx)
697{
698 struct ieee80211_sub_if_data *sdata;
699 u8 rx_chains_static, rx_chains_dynamic;
700
701 lockdep_assert_held(&local->chanctx_mtx);
702
703 rx_chains_static = 1;
704 rx_chains_dynamic = 1;
705
706 rcu_read_lock();
707 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
708 u8 needed_static, needed_dynamic;
709
710 if (!ieee80211_sdata_running(sdata))
711 continue;
712
713 if (rcu_access_pointer(sdata->vif.chanctx_conf) !=
714 &chanctx->conf)
715 continue;
716
717 switch (sdata->vif.type) {
718 case NL80211_IFTYPE_P2P_DEVICE:
719 continue;
720 case NL80211_IFTYPE_STATION:
721 if (!sdata->u.mgd.associated)
722 continue;
723 break;
724 case NL80211_IFTYPE_AP_VLAN:
725 continue;
726 case NL80211_IFTYPE_AP:
727 case NL80211_IFTYPE_ADHOC:
728 case NL80211_IFTYPE_WDS:
729 case NL80211_IFTYPE_MESH_POINT:
730 case NL80211_IFTYPE_OCB:
731 break;
732 default:
733 WARN_ON_ONCE(1);
734 }
735
736 switch (sdata->smps_mode) {
737 default:
738 WARN_ONCE(1, "Invalid SMPS mode %d\n",
739 sdata->smps_mode);
740
741 case IEEE80211_SMPS_OFF:
742 needed_static = sdata->needed_rx_chains;
743 needed_dynamic = sdata->needed_rx_chains;
744 break;
745 case IEEE80211_SMPS_DYNAMIC:
746 needed_static = 1;
747 needed_dynamic = sdata->needed_rx_chains;
748 break;
749 case IEEE80211_SMPS_STATIC:
750 needed_static = 1;
751 needed_dynamic = 1;
752 break;
753 }
754
755 rx_chains_static = max(rx_chains_static, needed_static);
756 rx_chains_dynamic = max(rx_chains_dynamic, needed_dynamic);
757 }
758
759
760 sdata = rcu_dereference(local->monitor_sdata);
761 if (sdata &&
762 rcu_access_pointer(sdata->vif.chanctx_conf) == &chanctx->conf)
763 rx_chains_dynamic = rx_chains_static = local->rx_chains;
764
765 rcu_read_unlock();
766
767 if (!local->use_chanctx) {
768 if (rx_chains_static > 1)
769 local->smps_mode = IEEE80211_SMPS_OFF;
770 else if (rx_chains_dynamic > 1)
771 local->smps_mode = IEEE80211_SMPS_DYNAMIC;
772 else
773 local->smps_mode = IEEE80211_SMPS_STATIC;
774 ieee80211_hw_config(local, 0);
775 }
776
777 if (rx_chains_static == chanctx->conf.rx_chains_static &&
778 rx_chains_dynamic == chanctx->conf.rx_chains_dynamic)
779 return;
780
781 chanctx->conf.rx_chains_static = rx_chains_static;
782 chanctx->conf.rx_chains_dynamic = rx_chains_dynamic;
783 drv_change_chanctx(local, chanctx, IEEE80211_CHANCTX_CHANGE_RX_CHAINS);
784}
785
786static void
787__ieee80211_vif_copy_chanctx_to_vlans(struct ieee80211_sub_if_data *sdata,
788 bool clear)
789{
790 struct ieee80211_local *local __maybe_unused = sdata->local;
791 struct ieee80211_sub_if_data *vlan;
792 struct ieee80211_chanctx_conf *conf;
793
794 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_AP))
795 return;
796
797 lockdep_assert_held(&local->mtx);
798
799
800
801
802
803
804
805 conf = rcu_dereference_protected(sdata->vif.chanctx_conf,
806 lockdep_is_held(&local->chanctx_mtx));
807 WARN_ON(!conf);
808
809 if (clear)
810 conf = NULL;
811
812 list_for_each_entry(vlan, &sdata->u.ap.vlans, u.vlan.list)
813 rcu_assign_pointer(vlan->vif.chanctx_conf, conf);
814}
815
816void ieee80211_vif_copy_chanctx_to_vlans(struct ieee80211_sub_if_data *sdata,
817 bool clear)
818{
819 struct ieee80211_local *local = sdata->local;
820
821 mutex_lock(&local->chanctx_mtx);
822
823 __ieee80211_vif_copy_chanctx_to_vlans(sdata, clear);
824
825 mutex_unlock(&local->chanctx_mtx);
826}
827
828int ieee80211_vif_unreserve_chanctx(struct ieee80211_sub_if_data *sdata)
829{
830 struct ieee80211_chanctx *ctx = sdata->reserved_chanctx;
831
832 lockdep_assert_held(&sdata->local->chanctx_mtx);
833
834 if (WARN_ON(!ctx))
835 return -EINVAL;
836
837 list_del(&sdata->reserved_chanctx_list);
838 sdata->reserved_chanctx = NULL;
839
840 if (ieee80211_chanctx_refcount(sdata->local, ctx) == 0) {
841 if (ctx->replace_state == IEEE80211_CHANCTX_REPLACES_OTHER) {
842 if (WARN_ON(!ctx->replace_ctx))
843 return -EINVAL;
844
845 WARN_ON(ctx->replace_ctx->replace_state !=
846 IEEE80211_CHANCTX_WILL_BE_REPLACED);
847 WARN_ON(ctx->replace_ctx->replace_ctx != ctx);
848
849 ctx->replace_ctx->replace_ctx = NULL;
850 ctx->replace_ctx->replace_state =
851 IEEE80211_CHANCTX_REPLACE_NONE;
852
853 list_del_rcu(&ctx->list);
854 kfree_rcu(ctx, rcu_head);
855 } else {
856 ieee80211_free_chanctx(sdata->local, ctx);
857 }
858 }
859
860 return 0;
861}
862
863int ieee80211_vif_reserve_chanctx(struct ieee80211_sub_if_data *sdata,
864 const struct cfg80211_chan_def *chandef,
865 enum ieee80211_chanctx_mode mode,
866 bool radar_required)
867{
868 struct ieee80211_local *local = sdata->local;
869 struct ieee80211_chanctx *new_ctx, *curr_ctx, *ctx;
870
871 lockdep_assert_held(&local->chanctx_mtx);
872
873 curr_ctx = ieee80211_vif_get_chanctx(sdata);
874 if (curr_ctx && local->use_chanctx && !local->ops->switch_vif_chanctx)
875 return -ENOTSUPP;
876
877 new_ctx = ieee80211_find_reservation_chanctx(local, chandef, mode);
878 if (!new_ctx) {
879 if (ieee80211_can_create_new_chanctx(local)) {
880 new_ctx = ieee80211_new_chanctx(local, chandef, mode);
881 if (IS_ERR(new_ctx))
882 return PTR_ERR(new_ctx);
883 } else {
884 if (!curr_ctx ||
885 (curr_ctx->replace_state ==
886 IEEE80211_CHANCTX_WILL_BE_REPLACED) ||
887 !list_empty(&curr_ctx->reserved_vifs)) {
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910 list_for_each_entry(ctx, &local->chanctx_list,
911 list) {
912 if (ctx->replace_state !=
913 IEEE80211_CHANCTX_REPLACE_NONE)
914 continue;
915
916 if (!list_empty(&ctx->reserved_vifs))
917 continue;
918
919 curr_ctx = ctx;
920 break;
921 }
922 }
923
924
925
926
927
928 if (!curr_ctx ||
929 (curr_ctx->replace_state ==
930 IEEE80211_CHANCTX_WILL_BE_REPLACED) ||
931 !list_empty(&curr_ctx->reserved_vifs))
932 return -EBUSY;
933
934 new_ctx = ieee80211_alloc_chanctx(local, chandef, mode);
935 if (!new_ctx)
936 return -ENOMEM;
937
938 new_ctx->replace_ctx = curr_ctx;
939 new_ctx->replace_state =
940 IEEE80211_CHANCTX_REPLACES_OTHER;
941
942 curr_ctx->replace_ctx = new_ctx;
943 curr_ctx->replace_state =
944 IEEE80211_CHANCTX_WILL_BE_REPLACED;
945
946 list_add_rcu(&new_ctx->list, &local->chanctx_list);
947 }
948 }
949
950 list_add(&sdata->reserved_chanctx_list, &new_ctx->reserved_vifs);
951 sdata->reserved_chanctx = new_ctx;
952 sdata->reserved_chandef = *chandef;
953 sdata->reserved_radar_required = radar_required;
954 sdata->reserved_ready = false;
955
956 return 0;
957}
958
959static void
960ieee80211_vif_chanctx_reservation_complete(struct ieee80211_sub_if_data *sdata)
961{
962 switch (sdata->vif.type) {
963 case NL80211_IFTYPE_ADHOC:
964 case NL80211_IFTYPE_AP:
965 case NL80211_IFTYPE_MESH_POINT:
966 case NL80211_IFTYPE_OCB:
967 ieee80211_queue_work(&sdata->local->hw,
968 &sdata->csa_finalize_work);
969 break;
970 case NL80211_IFTYPE_STATION:
971 ieee80211_queue_work(&sdata->local->hw,
972 &sdata->u.mgd.chswitch_work);
973 break;
974 case NL80211_IFTYPE_UNSPECIFIED:
975 case NL80211_IFTYPE_AP_VLAN:
976 case NL80211_IFTYPE_WDS:
977 case NL80211_IFTYPE_MONITOR:
978 case NL80211_IFTYPE_P2P_CLIENT:
979 case NL80211_IFTYPE_P2P_GO:
980 case NL80211_IFTYPE_P2P_DEVICE:
981 case NUM_NL80211_IFTYPES:
982 WARN_ON(1);
983 break;
984 }
985}
986
987static void
988ieee80211_vif_update_chandef(struct ieee80211_sub_if_data *sdata,
989 const struct cfg80211_chan_def *chandef)
990{
991 struct ieee80211_sub_if_data *vlan;
992
993 sdata->vif.bss_conf.chandef = *chandef;
994
995 if (sdata->vif.type != NL80211_IFTYPE_AP)
996 return;
997
998 list_for_each_entry(vlan, &sdata->u.ap.vlans, u.vlan.list)
999 vlan->vif.bss_conf.chandef = *chandef;
1000}
1001
1002static int
1003ieee80211_vif_use_reserved_reassign(struct ieee80211_sub_if_data *sdata)
1004{
1005 struct ieee80211_local *local = sdata->local;
1006 struct ieee80211_vif_chanctx_switch vif_chsw[1] = {};
1007 struct ieee80211_chanctx *old_ctx, *new_ctx;
1008 const struct cfg80211_chan_def *chandef;
1009 u32 changed = 0;
1010 int err;
1011
1012 lockdep_assert_held(&local->mtx);
1013 lockdep_assert_held(&local->chanctx_mtx);
1014
1015 new_ctx = sdata->reserved_chanctx;
1016 old_ctx = ieee80211_vif_get_chanctx(sdata);
1017
1018 if (WARN_ON(!sdata->reserved_ready))
1019 return -EBUSY;
1020
1021 if (WARN_ON(!new_ctx))
1022 return -EINVAL;
1023
1024 if (WARN_ON(!old_ctx))
1025 return -EINVAL;
1026
1027 if (WARN_ON(new_ctx->replace_state ==
1028 IEEE80211_CHANCTX_REPLACES_OTHER))
1029 return -EINVAL;
1030
1031 chandef = ieee80211_chanctx_non_reserved_chandef(local, new_ctx,
1032 &sdata->reserved_chandef);
1033 if (WARN_ON(!chandef))
1034 return -EINVAL;
1035
1036 ieee80211_change_chanctx(local, new_ctx, chandef);
1037
1038 vif_chsw[0].vif = &sdata->vif;
1039 vif_chsw[0].old_ctx = &old_ctx->conf;
1040 vif_chsw[0].new_ctx = &new_ctx->conf;
1041
1042 list_del(&sdata->reserved_chanctx_list);
1043 sdata->reserved_chanctx = NULL;
1044
1045 err = drv_switch_vif_chanctx(local, vif_chsw, 1,
1046 CHANCTX_SWMODE_REASSIGN_VIF);
1047 if (err) {
1048 if (ieee80211_chanctx_refcount(local, new_ctx) == 0)
1049 ieee80211_free_chanctx(local, new_ctx);
1050
1051 goto out;
1052 }
1053
1054 list_move(&sdata->assigned_chanctx_list, &new_ctx->assigned_vifs);
1055 rcu_assign_pointer(sdata->vif.chanctx_conf, &new_ctx->conf);
1056
1057 if (sdata->vif.type == NL80211_IFTYPE_AP)
1058 __ieee80211_vif_copy_chanctx_to_vlans(sdata, false);
1059
1060 ieee80211_check_fast_xmit_iface(sdata);
1061
1062 if (ieee80211_chanctx_refcount(local, old_ctx) == 0)
1063 ieee80211_free_chanctx(local, old_ctx);
1064
1065 if (sdata->vif.bss_conf.chandef.width != sdata->reserved_chandef.width)
1066 changed = BSS_CHANGED_BANDWIDTH;
1067
1068 ieee80211_vif_update_chandef(sdata, &sdata->reserved_chandef);
1069
1070 ieee80211_recalc_smps_chanctx(local, new_ctx);
1071 ieee80211_recalc_radar_chanctx(local, new_ctx);
1072 ieee80211_recalc_chanctx_min_def(local, new_ctx);
1073
1074 if (changed)
1075 ieee80211_bss_info_change_notify(sdata, changed);
1076
1077out:
1078 ieee80211_vif_chanctx_reservation_complete(sdata);
1079 return err;
1080}
1081
1082static int
1083ieee80211_vif_use_reserved_assign(struct ieee80211_sub_if_data *sdata)
1084{
1085 struct ieee80211_local *local = sdata->local;
1086 struct ieee80211_chanctx *old_ctx, *new_ctx;
1087 const struct cfg80211_chan_def *chandef;
1088 int err;
1089
1090 old_ctx = ieee80211_vif_get_chanctx(sdata);
1091 new_ctx = sdata->reserved_chanctx;
1092
1093 if (WARN_ON(!sdata->reserved_ready))
1094 return -EINVAL;
1095
1096 if (WARN_ON(old_ctx))
1097 return -EINVAL;
1098
1099 if (WARN_ON(!new_ctx))
1100 return -EINVAL;
1101
1102 if (WARN_ON(new_ctx->replace_state ==
1103 IEEE80211_CHANCTX_REPLACES_OTHER))
1104 return -EINVAL;
1105
1106 chandef = ieee80211_chanctx_non_reserved_chandef(local, new_ctx,
1107 &sdata->reserved_chandef);
1108 if (WARN_ON(!chandef))
1109 return -EINVAL;
1110
1111 ieee80211_change_chanctx(local, new_ctx, chandef);
1112
1113 list_del(&sdata->reserved_chanctx_list);
1114 sdata->reserved_chanctx = NULL;
1115
1116 err = ieee80211_assign_vif_chanctx(sdata, new_ctx);
1117 if (err) {
1118 if (ieee80211_chanctx_refcount(local, new_ctx) == 0)
1119 ieee80211_free_chanctx(local, new_ctx);
1120
1121 goto out;
1122 }
1123
1124out:
1125 ieee80211_vif_chanctx_reservation_complete(sdata);
1126 return err;
1127}
1128
1129static bool
1130ieee80211_vif_has_in_place_reservation(struct ieee80211_sub_if_data *sdata)
1131{
1132 struct ieee80211_chanctx *old_ctx, *new_ctx;
1133
1134 lockdep_assert_held(&sdata->local->chanctx_mtx);
1135
1136 new_ctx = sdata->reserved_chanctx;
1137 old_ctx = ieee80211_vif_get_chanctx(sdata);
1138
1139 if (!old_ctx)
1140 return false;
1141
1142 if (WARN_ON(!new_ctx))
1143 return false;
1144
1145 if (old_ctx->replace_state != IEEE80211_CHANCTX_WILL_BE_REPLACED)
1146 return false;
1147
1148 if (new_ctx->replace_state != IEEE80211_CHANCTX_REPLACES_OTHER)
1149 return false;
1150
1151 return true;
1152}
1153
1154static int ieee80211_chsw_switch_hwconf(struct ieee80211_local *local,
1155 struct ieee80211_chanctx *new_ctx)
1156{
1157 const struct cfg80211_chan_def *chandef;
1158
1159 lockdep_assert_held(&local->mtx);
1160 lockdep_assert_held(&local->chanctx_mtx);
1161
1162 chandef = ieee80211_chanctx_reserved_chandef(local, new_ctx, NULL);
1163 if (WARN_ON(!chandef))
1164 return -EINVAL;
1165
1166 local->hw.conf.radar_enabled = new_ctx->conf.radar_enabled;
1167 local->_oper_chandef = *chandef;
1168 ieee80211_hw_config(local, 0);
1169
1170 return 0;
1171}
1172
1173static int ieee80211_chsw_switch_vifs(struct ieee80211_local *local,
1174 int n_vifs)
1175{
1176 struct ieee80211_vif_chanctx_switch *vif_chsw;
1177 struct ieee80211_sub_if_data *sdata;
1178 struct ieee80211_chanctx *ctx, *old_ctx;
1179 int i, err;
1180
1181 lockdep_assert_held(&local->mtx);
1182 lockdep_assert_held(&local->chanctx_mtx);
1183
1184 vif_chsw = kzalloc(sizeof(vif_chsw[0]) * n_vifs, GFP_KERNEL);
1185 if (!vif_chsw)
1186 return -ENOMEM;
1187
1188 i = 0;
1189 list_for_each_entry(ctx, &local->chanctx_list, list) {
1190 if (ctx->replace_state != IEEE80211_CHANCTX_REPLACES_OTHER)
1191 continue;
1192
1193 if (WARN_ON(!ctx->replace_ctx)) {
1194 err = -EINVAL;
1195 goto out;
1196 }
1197
1198 list_for_each_entry(sdata, &ctx->reserved_vifs,
1199 reserved_chanctx_list) {
1200 if (!ieee80211_vif_has_in_place_reservation(
1201 sdata))
1202 continue;
1203
1204 old_ctx = ieee80211_vif_get_chanctx(sdata);
1205 vif_chsw[i].vif = &sdata->vif;
1206 vif_chsw[i].old_ctx = &old_ctx->conf;
1207 vif_chsw[i].new_ctx = &ctx->conf;
1208
1209 i++;
1210 }
1211 }
1212
1213 err = drv_switch_vif_chanctx(local, vif_chsw, n_vifs,
1214 CHANCTX_SWMODE_SWAP_CONTEXTS);
1215
1216out:
1217 kfree(vif_chsw);
1218 return err;
1219}
1220
1221static int ieee80211_chsw_switch_ctxs(struct ieee80211_local *local)
1222{
1223 struct ieee80211_chanctx *ctx;
1224 int err;
1225
1226 lockdep_assert_held(&local->mtx);
1227 lockdep_assert_held(&local->chanctx_mtx);
1228
1229 list_for_each_entry(ctx, &local->chanctx_list, list) {
1230 if (ctx->replace_state != IEEE80211_CHANCTX_REPLACES_OTHER)
1231 continue;
1232
1233 if (!list_empty(&ctx->replace_ctx->assigned_vifs))
1234 continue;
1235
1236 ieee80211_del_chanctx(local, ctx->replace_ctx);
1237 err = ieee80211_add_chanctx(local, ctx);
1238 if (err)
1239 goto err;
1240 }
1241
1242 return 0;
1243
1244err:
1245 WARN_ON(ieee80211_add_chanctx(local, ctx));
1246 list_for_each_entry_continue_reverse(ctx, &local->chanctx_list, list) {
1247 if (ctx->replace_state != IEEE80211_CHANCTX_REPLACES_OTHER)
1248 continue;
1249
1250 if (!list_empty(&ctx->replace_ctx->assigned_vifs))
1251 continue;
1252
1253 ieee80211_del_chanctx(local, ctx);
1254 WARN_ON(ieee80211_add_chanctx(local, ctx->replace_ctx));
1255 }
1256
1257 return err;
1258}
1259
1260static int ieee80211_vif_use_reserved_switch(struct ieee80211_local *local)
1261{
1262 struct ieee80211_sub_if_data *sdata, *sdata_tmp;
1263 struct ieee80211_chanctx *ctx, *ctx_tmp, *old_ctx;
1264 struct ieee80211_chanctx *new_ctx = NULL;
1265 int i, err, n_assigned, n_reserved, n_ready;
1266 int n_ctx = 0, n_vifs_switch = 0, n_vifs_assign = 0, n_vifs_ctxless = 0;
1267
1268 lockdep_assert_held(&local->mtx);
1269 lockdep_assert_held(&local->chanctx_mtx);
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287 list_for_each_entry(ctx, &local->chanctx_list, list) {
1288 if (ctx->replace_state != IEEE80211_CHANCTX_REPLACES_OTHER)
1289 continue;
1290
1291 if (WARN_ON(!ctx->replace_ctx)) {
1292 err = -EINVAL;
1293 goto err;
1294 }
1295
1296 if (!local->use_chanctx)
1297 new_ctx = ctx;
1298
1299 n_ctx++;
1300
1301 n_assigned = 0;
1302 n_reserved = 0;
1303 n_ready = 0;
1304
1305 list_for_each_entry(sdata, &ctx->replace_ctx->assigned_vifs,
1306 assigned_chanctx_list) {
1307 n_assigned++;
1308 if (sdata->reserved_chanctx) {
1309 n_reserved++;
1310 if (sdata->reserved_ready)
1311 n_ready++;
1312 }
1313 }
1314
1315 if (n_assigned != n_reserved) {
1316 if (n_ready == n_reserved) {
1317 wiphy_info(local->hw.wiphy,
1318 "channel context reservation cannot be finalized because some interfaces aren't switching\n");
1319 err = -EBUSY;
1320 goto err;
1321 }
1322
1323 return -EAGAIN;
1324 }
1325
1326 ctx->conf.radar_enabled = false;
1327 list_for_each_entry(sdata, &ctx->reserved_vifs,
1328 reserved_chanctx_list) {
1329 if (ieee80211_vif_has_in_place_reservation(sdata) &&
1330 !sdata->reserved_ready)
1331 return -EAGAIN;
1332
1333 old_ctx = ieee80211_vif_get_chanctx(sdata);
1334 if (old_ctx) {
1335 if (old_ctx->replace_state ==
1336 IEEE80211_CHANCTX_WILL_BE_REPLACED)
1337 n_vifs_switch++;
1338 else
1339 n_vifs_assign++;
1340 } else {
1341 n_vifs_ctxless++;
1342 }
1343
1344 if (sdata->reserved_radar_required)
1345 ctx->conf.radar_enabled = true;
1346 }
1347 }
1348
1349 if (WARN_ON(n_ctx == 0) ||
1350 WARN_ON(n_vifs_switch == 0 &&
1351 n_vifs_assign == 0 &&
1352 n_vifs_ctxless == 0) ||
1353 WARN_ON(n_ctx > 1 && !local->use_chanctx) ||
1354 WARN_ON(!new_ctx && !local->use_chanctx)) {
1355 err = -EINVAL;
1356 goto err;
1357 }
1358
1359
1360
1361
1362
1363
1364 if (local->use_chanctx) {
1365 if (n_vifs_switch > 0) {
1366 err = ieee80211_chsw_switch_vifs(local, n_vifs_switch);
1367 if (err)
1368 goto err;
1369 }
1370
1371 if (n_vifs_assign > 0 || n_vifs_ctxless > 0) {
1372 err = ieee80211_chsw_switch_ctxs(local);
1373 if (err)
1374 goto err;
1375 }
1376 } else {
1377 err = ieee80211_chsw_switch_hwconf(local, new_ctx);
1378 if (err)
1379 goto err;
1380 }
1381
1382
1383
1384
1385
1386
1387 i = 0;
1388 list_for_each_entry(ctx, &local->chanctx_list, list) {
1389 if (ctx->replace_state != IEEE80211_CHANCTX_REPLACES_OTHER)
1390 continue;
1391
1392 if (WARN_ON(!ctx->replace_ctx)) {
1393 err = -EINVAL;
1394 goto err;
1395 }
1396
1397 list_for_each_entry(sdata, &ctx->reserved_vifs,
1398 reserved_chanctx_list) {
1399 u32 changed = 0;
1400
1401 if (!ieee80211_vif_has_in_place_reservation(sdata))
1402 continue;
1403
1404 rcu_assign_pointer(sdata->vif.chanctx_conf, &ctx->conf);
1405
1406 if (sdata->vif.type == NL80211_IFTYPE_AP)
1407 __ieee80211_vif_copy_chanctx_to_vlans(sdata,
1408 false);
1409
1410 ieee80211_check_fast_xmit_iface(sdata);
1411
1412 sdata->radar_required = sdata->reserved_radar_required;
1413
1414 if (sdata->vif.bss_conf.chandef.width !=
1415 sdata->reserved_chandef.width)
1416 changed = BSS_CHANGED_BANDWIDTH;
1417
1418 ieee80211_vif_update_chandef(sdata, &sdata->reserved_chandef);
1419 if (changed)
1420 ieee80211_bss_info_change_notify(sdata,
1421 changed);
1422
1423 ieee80211_recalc_txpower(sdata, false);
1424 }
1425
1426 ieee80211_recalc_chanctx_chantype(local, ctx);
1427 ieee80211_recalc_smps_chanctx(local, ctx);
1428 ieee80211_recalc_radar_chanctx(local, ctx);
1429 ieee80211_recalc_chanctx_min_def(local, ctx);
1430
1431 list_for_each_entry_safe(sdata, sdata_tmp, &ctx->reserved_vifs,
1432 reserved_chanctx_list) {
1433 if (ieee80211_vif_get_chanctx(sdata) != ctx)
1434 continue;
1435
1436 list_del(&sdata->reserved_chanctx_list);
1437 list_move(&sdata->assigned_chanctx_list,
1438 &ctx->assigned_vifs);
1439 sdata->reserved_chanctx = NULL;
1440
1441 ieee80211_vif_chanctx_reservation_complete(sdata);
1442 }
1443
1444
1445
1446
1447
1448
1449
1450
1451 list_for_each_entry_safe(sdata, sdata_tmp, &ctx->reserved_vifs,
1452 reserved_chanctx_list) {
1453 if (WARN_ON(ieee80211_vif_has_in_place_reservation(
1454 sdata)))
1455 continue;
1456
1457 if (WARN_ON(sdata->reserved_chanctx != ctx))
1458 continue;
1459
1460 if (!sdata->reserved_ready)
1461 continue;
1462
1463 if (ieee80211_vif_get_chanctx(sdata))
1464 err = ieee80211_vif_use_reserved_reassign(
1465 sdata);
1466 else
1467 err = ieee80211_vif_use_reserved_assign(sdata);
1468
1469 if (err) {
1470 sdata_info(sdata,
1471 "failed to finalize (re-)assign reservation (err=%d)\n",
1472 err);
1473 ieee80211_vif_unreserve_chanctx(sdata);
1474 cfg80211_stop_iface(local->hw.wiphy,
1475 &sdata->wdev,
1476 GFP_KERNEL);
1477 }
1478 }
1479 }
1480
1481
1482
1483
1484
1485 list_for_each_entry_safe(ctx, ctx_tmp, &local->chanctx_list, list) {
1486 if (ctx->replace_state != IEEE80211_CHANCTX_WILL_BE_REPLACED)
1487 continue;
1488
1489 ctx->replace_ctx->replace_ctx = NULL;
1490 ctx->replace_ctx->replace_state =
1491 IEEE80211_CHANCTX_REPLACE_NONE;
1492
1493 list_del_rcu(&ctx->list);
1494 kfree_rcu(ctx, rcu_head);
1495 }
1496
1497 return 0;
1498
1499err:
1500 list_for_each_entry(ctx, &local->chanctx_list, list) {
1501 if (ctx->replace_state != IEEE80211_CHANCTX_REPLACES_OTHER)
1502 continue;
1503
1504 list_for_each_entry_safe(sdata, sdata_tmp, &ctx->reserved_vifs,
1505 reserved_chanctx_list) {
1506 ieee80211_vif_unreserve_chanctx(sdata);
1507 ieee80211_vif_chanctx_reservation_complete(sdata);
1508 }
1509 }
1510
1511 return err;
1512}
1513
1514static void __ieee80211_vif_release_channel(struct ieee80211_sub_if_data *sdata)
1515{
1516 struct ieee80211_local *local = sdata->local;
1517 struct ieee80211_chanctx_conf *conf;
1518 struct ieee80211_chanctx *ctx;
1519 bool use_reserved_switch = false;
1520
1521 lockdep_assert_held(&local->chanctx_mtx);
1522
1523 conf = rcu_dereference_protected(sdata->vif.chanctx_conf,
1524 lockdep_is_held(&local->chanctx_mtx));
1525 if (!conf)
1526 return;
1527
1528 ctx = container_of(conf, struct ieee80211_chanctx, conf);
1529
1530 if (sdata->reserved_chanctx) {
1531 if (sdata->reserved_chanctx->replace_state ==
1532 IEEE80211_CHANCTX_REPLACES_OTHER &&
1533 ieee80211_chanctx_num_reserved(local,
1534 sdata->reserved_chanctx) > 1)
1535 use_reserved_switch = true;
1536
1537 ieee80211_vif_unreserve_chanctx(sdata);
1538 }
1539
1540 ieee80211_assign_vif_chanctx(sdata, NULL);
1541 if (ieee80211_chanctx_refcount(local, ctx) == 0)
1542 ieee80211_free_chanctx(local, ctx);
1543
1544 sdata->radar_required = false;
1545
1546
1547 if (use_reserved_switch)
1548 ieee80211_vif_use_reserved_switch(local);
1549}
1550
1551int ieee80211_vif_use_channel(struct ieee80211_sub_if_data *sdata,
1552 const struct cfg80211_chan_def *chandef,
1553 enum ieee80211_chanctx_mode mode)
1554{
1555 struct ieee80211_local *local = sdata->local;
1556 struct ieee80211_chanctx *ctx;
1557 u8 radar_detect_width = 0;
1558 int ret;
1559
1560 lockdep_assert_held(&local->mtx);
1561
1562 WARN_ON(sdata->dev && netif_carrier_ok(sdata->dev));
1563
1564 mutex_lock(&local->chanctx_mtx);
1565
1566 ret = cfg80211_chandef_dfs_required(local->hw.wiphy,
1567 chandef,
1568 sdata->wdev.iftype);
1569 if (ret < 0)
1570 goto out;
1571 if (ret > 0)
1572 radar_detect_width = BIT(chandef->width);
1573
1574 sdata->radar_required = ret;
1575
1576 ret = ieee80211_check_combinations(sdata, chandef, mode,
1577 radar_detect_width);
1578 if (ret < 0)
1579 goto out;
1580
1581 __ieee80211_vif_release_channel(sdata);
1582
1583 ctx = ieee80211_find_chanctx(local, chandef, mode);
1584 if (!ctx)
1585 ctx = ieee80211_new_chanctx(local, chandef, mode);
1586 if (IS_ERR(ctx)) {
1587 ret = PTR_ERR(ctx);
1588 goto out;
1589 }
1590
1591 ieee80211_vif_update_chandef(sdata, chandef);
1592
1593 ret = ieee80211_assign_vif_chanctx(sdata, ctx);
1594 if (ret) {
1595
1596 if (ieee80211_chanctx_refcount(local, ctx) == 0)
1597 ieee80211_free_chanctx(local, ctx);
1598 goto out;
1599 }
1600
1601 ieee80211_recalc_smps_chanctx(local, ctx);
1602 ieee80211_recalc_radar_chanctx(local, ctx);
1603 out:
1604 if (ret)
1605 sdata->radar_required = false;
1606
1607 mutex_unlock(&local->chanctx_mtx);
1608 return ret;
1609}
1610
1611int ieee80211_vif_use_reserved_context(struct ieee80211_sub_if_data *sdata)
1612{
1613 struct ieee80211_local *local = sdata->local;
1614 struct ieee80211_chanctx *new_ctx;
1615 struct ieee80211_chanctx *old_ctx;
1616 int err;
1617
1618 lockdep_assert_held(&local->mtx);
1619 lockdep_assert_held(&local->chanctx_mtx);
1620
1621 new_ctx = sdata->reserved_chanctx;
1622 old_ctx = ieee80211_vif_get_chanctx(sdata);
1623
1624 if (WARN_ON(!new_ctx))
1625 return -EINVAL;
1626
1627 if (WARN_ON(new_ctx->replace_state ==
1628 IEEE80211_CHANCTX_WILL_BE_REPLACED))
1629 return -EINVAL;
1630
1631 if (WARN_ON(sdata->reserved_ready))
1632 return -EINVAL;
1633
1634 sdata->reserved_ready = true;
1635
1636 if (new_ctx->replace_state == IEEE80211_CHANCTX_REPLACE_NONE) {
1637 if (old_ctx)
1638 err = ieee80211_vif_use_reserved_reassign(sdata);
1639 else
1640 err = ieee80211_vif_use_reserved_assign(sdata);
1641
1642 if (err)
1643 return err;
1644 }
1645
1646
1647
1648
1649
1650
1651
1652
1653
1654
1655
1656
1657 if ((old_ctx &&
1658 old_ctx->replace_state == IEEE80211_CHANCTX_WILL_BE_REPLACED) ||
1659 new_ctx->replace_state == IEEE80211_CHANCTX_REPLACES_OTHER) {
1660 err = ieee80211_vif_use_reserved_switch(local);
1661 if (err && err != -EAGAIN) {
1662 if (new_ctx->replace_state ==
1663 IEEE80211_CHANCTX_REPLACES_OTHER)
1664 return err;
1665
1666 wiphy_info(local->hw.wiphy,
1667 "depending in-place reservation failed (err=%d)\n",
1668 err);
1669 }
1670 }
1671
1672 return 0;
1673}
1674
1675int ieee80211_vif_change_bandwidth(struct ieee80211_sub_if_data *sdata,
1676 const struct cfg80211_chan_def *chandef,
1677 u32 *changed)
1678{
1679 struct ieee80211_local *local = sdata->local;
1680 struct ieee80211_chanctx_conf *conf;
1681 struct ieee80211_chanctx *ctx;
1682 const struct cfg80211_chan_def *compat;
1683 int ret;
1684
1685 if (!cfg80211_chandef_usable(sdata->local->hw.wiphy, chandef,
1686 IEEE80211_CHAN_DISABLED))
1687 return -EINVAL;
1688
1689 mutex_lock(&local->chanctx_mtx);
1690 if (cfg80211_chandef_identical(chandef, &sdata->vif.bss_conf.chandef)) {
1691 ret = 0;
1692 goto out;
1693 }
1694
1695 if (chandef->width == NL80211_CHAN_WIDTH_20_NOHT ||
1696 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_20_NOHT) {
1697 ret = -EINVAL;
1698 goto out;
1699 }
1700
1701 conf = rcu_dereference_protected(sdata->vif.chanctx_conf,
1702 lockdep_is_held(&local->chanctx_mtx));
1703 if (!conf) {
1704 ret = -EINVAL;
1705 goto out;
1706 }
1707
1708 ctx = container_of(conf, struct ieee80211_chanctx, conf);
1709
1710 compat = cfg80211_chandef_compatible(&conf->def, chandef);
1711 if (!compat) {
1712 ret = -EINVAL;
1713 goto out;
1714 }
1715
1716 switch (ctx->replace_state) {
1717 case IEEE80211_CHANCTX_REPLACE_NONE:
1718 if (!ieee80211_chanctx_reserved_chandef(local, ctx, compat)) {
1719 ret = -EBUSY;
1720 goto out;
1721 }
1722 break;
1723 case IEEE80211_CHANCTX_WILL_BE_REPLACED:
1724
1725
1726 ret = -EBUSY;
1727 goto out;
1728 case IEEE80211_CHANCTX_REPLACES_OTHER:
1729
1730
1731
1732 WARN_ON(1);
1733 break;
1734 }
1735
1736 ieee80211_vif_update_chandef(sdata, chandef);
1737
1738 ieee80211_recalc_chanctx_chantype(local, ctx);
1739
1740 *changed |= BSS_CHANGED_BANDWIDTH;
1741 ret = 0;
1742 out:
1743 mutex_unlock(&local->chanctx_mtx);
1744 return ret;
1745}
1746
1747void ieee80211_vif_release_channel(struct ieee80211_sub_if_data *sdata)
1748{
1749 WARN_ON(sdata->dev && netif_carrier_ok(sdata->dev));
1750
1751 lockdep_assert_held(&sdata->local->mtx);
1752
1753 mutex_lock(&sdata->local->chanctx_mtx);
1754 __ieee80211_vif_release_channel(sdata);
1755 mutex_unlock(&sdata->local->chanctx_mtx);
1756}
1757
1758void ieee80211_vif_vlan_copy_chanctx(struct ieee80211_sub_if_data *sdata)
1759{
1760 struct ieee80211_local *local = sdata->local;
1761 struct ieee80211_sub_if_data *ap;
1762 struct ieee80211_chanctx_conf *conf;
1763
1764 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_AP_VLAN || !sdata->bss))
1765 return;
1766
1767 ap = container_of(sdata->bss, struct ieee80211_sub_if_data, u.ap);
1768
1769 mutex_lock(&local->chanctx_mtx);
1770
1771 conf = rcu_dereference_protected(ap->vif.chanctx_conf,
1772 lockdep_is_held(&local->chanctx_mtx));
1773 rcu_assign_pointer(sdata->vif.chanctx_conf, conf);
1774 mutex_unlock(&local->chanctx_mtx);
1775}
1776
1777void ieee80211_iter_chan_contexts_atomic(
1778 struct ieee80211_hw *hw,
1779 void (*iter)(struct ieee80211_hw *hw,
1780 struct ieee80211_chanctx_conf *chanctx_conf,
1781 void *data),
1782 void *iter_data)
1783{
1784 struct ieee80211_local *local = hw_to_local(hw);
1785 struct ieee80211_chanctx *ctx;
1786
1787 rcu_read_lock();
1788 list_for_each_entry_rcu(ctx, &local->chanctx_list, list)
1789 if (ctx->driver_present)
1790 iter(hw, &ctx->conf, iter_data);
1791 rcu_read_unlock();
1792}
1793EXPORT_SYMBOL_GPL(ieee80211_iter_chan_contexts_atomic);
1794
