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TOMOYO Linux Cross Reference
Linux/net/mac80211/chan.c

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  1 // SPDX-License-Identifier: GPL-2.0-only
  2 /*
  3  * mac80211 - channel management
  4  */
  5 
  6 #include <linux/nl80211.h>
  7 #include <linux/export.h>
  8 #include <linux/rtnetlink.h>
  9 #include <net/cfg80211.h>
 10 #include "ieee80211_i.h"
 11 #include "driver-ops.h"
 12 
 13 static int ieee80211_chanctx_num_assigned(struct ieee80211_local *local,
 14                                           struct ieee80211_chanctx *ctx)
 15 {
 16         struct ieee80211_sub_if_data *sdata;
 17         int num = 0;
 18 
 19         lockdep_assert_held(&local->chanctx_mtx);
 20 
 21         list_for_each_entry(sdata, &ctx->assigned_vifs, assigned_chanctx_list)
 22                 num++;
 23 
 24         return num;
 25 }
 26 
 27 static int ieee80211_chanctx_num_reserved(struct ieee80211_local *local,
 28                                           struct ieee80211_chanctx *ctx)
 29 {
 30         struct ieee80211_sub_if_data *sdata;
 31         int num = 0;
 32 
 33         lockdep_assert_held(&local->chanctx_mtx);
 34 
 35         list_for_each_entry(sdata, &ctx->reserved_vifs, reserved_chanctx_list)
 36                 num++;
 37 
 38         return num;
 39 }
 40 
 41 int ieee80211_chanctx_refcount(struct ieee80211_local *local,
 42                                struct ieee80211_chanctx *ctx)
 43 {
 44         return ieee80211_chanctx_num_assigned(local, ctx) +
 45                ieee80211_chanctx_num_reserved(local, ctx);
 46 }
 47 
 48 static int ieee80211_num_chanctx(struct ieee80211_local *local)
 49 {
 50         struct ieee80211_chanctx *ctx;
 51         int num = 0;
 52 
 53         lockdep_assert_held(&local->chanctx_mtx);
 54 
 55         list_for_each_entry(ctx, &local->chanctx_list, list)
 56                 num++;
 57 
 58         return num;
 59 }
 60 
 61 static bool ieee80211_can_create_new_chanctx(struct ieee80211_local *local)
 62 {
 63         lockdep_assert_held(&local->chanctx_mtx);
 64         return ieee80211_num_chanctx(local) < ieee80211_max_num_channels(local);
 65 }
 66 
 67 static struct ieee80211_chanctx *
 68 ieee80211_vif_get_chanctx(struct ieee80211_sub_if_data *sdata)
 69 {
 70         struct ieee80211_local *local __maybe_unused = sdata->local;
 71         struct ieee80211_chanctx_conf *conf;
 72 
 73         conf = rcu_dereference_protected(sdata->vif.chanctx_conf,
 74                                          lockdep_is_held(&local->chanctx_mtx));
 75         if (!conf)
 76                 return NULL;
 77 
 78         return container_of(conf, struct ieee80211_chanctx, conf);
 79 }
 80 
 81 static const struct cfg80211_chan_def *
 82 ieee80211_chanctx_reserved_chandef(struct ieee80211_local *local,
 83                                    struct ieee80211_chanctx *ctx,
 84                                    const struct cfg80211_chan_def *compat)
 85 {
 86         struct ieee80211_sub_if_data *sdata;
 87 
 88         lockdep_assert_held(&local->chanctx_mtx);
 89 
 90         list_for_each_entry(sdata, &ctx->reserved_vifs,
 91                             reserved_chanctx_list) {
 92                 if (!compat)
 93                         compat = &sdata->reserved_chandef;
 94 
 95                 compat = cfg80211_chandef_compatible(&sdata->reserved_chandef,
 96                                                      compat);
 97                 if (!compat)
 98                         break;
 99         }
100 
101         return compat;
102 }
103 
104 static const struct cfg80211_chan_def *
105 ieee80211_chanctx_non_reserved_chandef(struct ieee80211_local *local,
106                                        struct ieee80211_chanctx *ctx,
107                                        const struct cfg80211_chan_def *compat)
108 {
109         struct ieee80211_sub_if_data *sdata;
110 
111         lockdep_assert_held(&local->chanctx_mtx);
112 
113         list_for_each_entry(sdata, &ctx->assigned_vifs,
114                             assigned_chanctx_list) {
115                 if (sdata->reserved_chanctx != NULL)
116                         continue;
117 
118                 if (!compat)
119                         compat = &sdata->vif.bss_conf.chandef;
120 
121                 compat = cfg80211_chandef_compatible(
122                                 &sdata->vif.bss_conf.chandef, compat);
123                 if (!compat)
124                         break;
125         }
126 
127         return compat;
128 }
129 
130 static const struct cfg80211_chan_def *
131 ieee80211_chanctx_combined_chandef(struct ieee80211_local *local,
132                                    struct ieee80211_chanctx *ctx,
133                                    const struct cfg80211_chan_def *compat)
134 {
135         lockdep_assert_held(&local->chanctx_mtx);
136 
137         compat = ieee80211_chanctx_reserved_chandef(local, ctx, compat);
138         if (!compat)
139                 return NULL;
140 
141         compat = ieee80211_chanctx_non_reserved_chandef(local, ctx, compat);
142         if (!compat)
143                 return NULL;
144 
145         return compat;
146 }
147 
148 static bool
149 ieee80211_chanctx_can_reserve_chandef(struct ieee80211_local *local,
150                                       struct ieee80211_chanctx *ctx,
151                                       const struct cfg80211_chan_def *def)
152 {
153         lockdep_assert_held(&local->chanctx_mtx);
154 
155         if (ieee80211_chanctx_combined_chandef(local, ctx, def))
156                 return true;
157 
158         if (!list_empty(&ctx->reserved_vifs) &&
159             ieee80211_chanctx_reserved_chandef(local, ctx, def))
160                 return true;
161 
162         return false;
163 }
164 
165 static struct ieee80211_chanctx *
166 ieee80211_find_reservation_chanctx(struct ieee80211_local *local,
167                                    const struct cfg80211_chan_def *chandef,
168                                    enum ieee80211_chanctx_mode mode)
169 {
170         struct ieee80211_chanctx *ctx;
171 
172         lockdep_assert_held(&local->chanctx_mtx);
173 
174         if (mode == IEEE80211_CHANCTX_EXCLUSIVE)
175                 return NULL;
176 
177         list_for_each_entry(ctx, &local->chanctx_list, list) {
178                 if (ctx->replace_state == IEEE80211_CHANCTX_WILL_BE_REPLACED)
179                         continue;
180 
181                 if (ctx->mode == IEEE80211_CHANCTX_EXCLUSIVE)
182                         continue;
183 
184                 if (!ieee80211_chanctx_can_reserve_chandef(local, ctx,
185                                                            chandef))
186                         continue;
187 
188                 return ctx;
189         }
190 
191         return NULL;
192 }
193 
194 enum nl80211_chan_width ieee80211_get_sta_bw(struct ieee80211_sta *sta)
195 {
196         switch (sta->bandwidth) {
197         case IEEE80211_STA_RX_BW_20:
198                 if (sta->ht_cap.ht_supported)
199                         return NL80211_CHAN_WIDTH_20;
200                 else
201                         return NL80211_CHAN_WIDTH_20_NOHT;
202         case IEEE80211_STA_RX_BW_40:
203                 return NL80211_CHAN_WIDTH_40;
204         case IEEE80211_STA_RX_BW_80:
205                 return NL80211_CHAN_WIDTH_80;
206         case IEEE80211_STA_RX_BW_160:
207                 /*
208                  * This applied for both 160 and 80+80. since we use
209                  * the returned value to consider degradation of
210                  * ctx->conf.min_def, we have to make sure to take
211                  * the bigger one (NL80211_CHAN_WIDTH_160).
212                  * Otherwise we might try degrading even when not
213                  * needed, as the max required sta_bw returned (80+80)
214                  * might be smaller than the configured bw (160).
215                  */
216                 return NL80211_CHAN_WIDTH_160;
217         default:
218                 WARN_ON(1);
219                 return NL80211_CHAN_WIDTH_20;
220         }
221 }
222 
223 static enum nl80211_chan_width
224 ieee80211_get_max_required_bw(struct ieee80211_sub_if_data *sdata)
225 {
226         enum nl80211_chan_width max_bw = NL80211_CHAN_WIDTH_20_NOHT;
227         struct sta_info *sta;
228 
229         rcu_read_lock();
230         list_for_each_entry_rcu(sta, &sdata->local->sta_list, list) {
231                 if (sdata != sta->sdata &&
232                     !(sta->sdata->bss && sta->sdata->bss == sdata->bss))
233                         continue;
234 
235                 max_bw = max(max_bw, ieee80211_get_sta_bw(&sta->sta));
236         }
237         rcu_read_unlock();
238 
239         return max_bw;
240 }
241 
242 static enum nl80211_chan_width
243 ieee80211_get_chanctx_max_required_bw(struct ieee80211_local *local,
244                                       struct ieee80211_chanctx_conf *conf)
245 {
246         struct ieee80211_sub_if_data *sdata;
247         enum nl80211_chan_width max_bw = NL80211_CHAN_WIDTH_20_NOHT;
248 
249         rcu_read_lock();
250         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
251                 struct ieee80211_vif *vif = &sdata->vif;
252                 enum nl80211_chan_width width = NL80211_CHAN_WIDTH_20_NOHT;
253 
254                 if (!ieee80211_sdata_running(sdata))
255                         continue;
256 
257                 if (rcu_access_pointer(sdata->vif.chanctx_conf) != conf)
258                         continue;
259 
260                 switch (vif->type) {
261                 case NL80211_IFTYPE_AP:
262                 case NL80211_IFTYPE_AP_VLAN:
263                         width = ieee80211_get_max_required_bw(sdata);
264                         break;
265                 case NL80211_IFTYPE_STATION:
266                         /*
267                          * The ap's sta->bandwidth is not set yet at this
268                          * point, so take the width from the chandef, but
269                          * account also for TDLS peers
270                          */
271                         width = max(vif->bss_conf.chandef.width,
272                                     ieee80211_get_max_required_bw(sdata));
273                         break;
274                 case NL80211_IFTYPE_P2P_DEVICE:
275                 case NL80211_IFTYPE_NAN:
276                         continue;
277                 case NL80211_IFTYPE_ADHOC:
278                 case NL80211_IFTYPE_WDS:
279                 case NL80211_IFTYPE_MESH_POINT:
280                 case NL80211_IFTYPE_OCB:
281                         width = vif->bss_conf.chandef.width;
282                         break;
283                 case NL80211_IFTYPE_UNSPECIFIED:
284                 case NUM_NL80211_IFTYPES:
285                 case NL80211_IFTYPE_MONITOR:
286                 case NL80211_IFTYPE_P2P_CLIENT:
287                 case NL80211_IFTYPE_P2P_GO:
288                         WARN_ON_ONCE(1);
289                 }
290                 max_bw = max(max_bw, width);
291         }
292 
293         /* use the configured bandwidth in case of monitor interface */
294         sdata = rcu_dereference(local->monitor_sdata);
295         if (sdata && rcu_access_pointer(sdata->vif.chanctx_conf) == conf)
296                 max_bw = max(max_bw, conf->def.width);
297 
298         rcu_read_unlock();
299 
300         return max_bw;
301 }
302 
303 /*
304  * recalc the min required chan width of the channel context, which is
305  * the max of min required widths of all the interfaces bound to this
306  * channel context.
307  */
308 void ieee80211_recalc_chanctx_min_def(struct ieee80211_local *local,
309                                       struct ieee80211_chanctx *ctx)
310 {
311         enum nl80211_chan_width max_bw;
312         struct cfg80211_chan_def min_def;
313 
314         lockdep_assert_held(&local->chanctx_mtx);
315 
316         /* don't optimize 5MHz, 10MHz, and radar_enabled confs */
317         if (ctx->conf.def.width == NL80211_CHAN_WIDTH_5 ||
318             ctx->conf.def.width == NL80211_CHAN_WIDTH_10 ||
319             ctx->conf.radar_enabled) {
320                 ctx->conf.min_def = ctx->conf.def;
321                 return;
322         }
323 
324         max_bw = ieee80211_get_chanctx_max_required_bw(local, &ctx->conf);
325 
326         /* downgrade chandef up to max_bw */
327         min_def = ctx->conf.def;
328         while (min_def.width > max_bw)
329                 ieee80211_chandef_downgrade(&min_def);
330 
331         if (cfg80211_chandef_identical(&ctx->conf.min_def, &min_def))
332                 return;
333 
334         ctx->conf.min_def = min_def;
335         if (!ctx->driver_present)
336                 return;
337 
338         drv_change_chanctx(local, ctx, IEEE80211_CHANCTX_CHANGE_MIN_WIDTH);
339 }
340 
341 static void ieee80211_change_chanctx(struct ieee80211_local *local,
342                                      struct ieee80211_chanctx *ctx,
343                                      const struct cfg80211_chan_def *chandef)
344 {
345         if (cfg80211_chandef_identical(&ctx->conf.def, chandef)) {
346                 ieee80211_recalc_chanctx_min_def(local, ctx);
347                 return;
348         }
349 
350         WARN_ON(!cfg80211_chandef_compatible(&ctx->conf.def, chandef));
351 
352         ctx->conf.def = *chandef;
353         drv_change_chanctx(local, ctx, IEEE80211_CHANCTX_CHANGE_WIDTH);
354         ieee80211_recalc_chanctx_min_def(local, ctx);
355 
356         if (!local->use_chanctx) {
357                 local->_oper_chandef = *chandef;
358                 ieee80211_hw_config(local, 0);
359         }
360 }
361 
362 static struct ieee80211_chanctx *
363 ieee80211_find_chanctx(struct ieee80211_local *local,
364                        const struct cfg80211_chan_def *chandef,
365                        enum ieee80211_chanctx_mode mode)
366 {
367         struct ieee80211_chanctx *ctx;
368 
369         lockdep_assert_held(&local->chanctx_mtx);
370 
371         if (mode == IEEE80211_CHANCTX_EXCLUSIVE)
372                 return NULL;
373 
374         list_for_each_entry(ctx, &local->chanctx_list, list) {
375                 const struct cfg80211_chan_def *compat;
376 
377                 if (ctx->replace_state != IEEE80211_CHANCTX_REPLACE_NONE)
378                         continue;
379 
380                 if (ctx->mode == IEEE80211_CHANCTX_EXCLUSIVE)
381                         continue;
382 
383                 compat = cfg80211_chandef_compatible(&ctx->conf.def, chandef);
384                 if (!compat)
385                         continue;
386 
387                 compat = ieee80211_chanctx_reserved_chandef(local, ctx,
388                                                             compat);
389                 if (!compat)
390                         continue;
391 
392                 ieee80211_change_chanctx(local, ctx, compat);
393 
394                 return ctx;
395         }
396 
397         return NULL;
398 }
399 
400 bool ieee80211_is_radar_required(struct ieee80211_local *local)
401 {
402         struct ieee80211_sub_if_data *sdata;
403 
404         lockdep_assert_held(&local->mtx);
405 
406         rcu_read_lock();
407         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
408                 if (sdata->radar_required) {
409                         rcu_read_unlock();
410                         return true;
411                 }
412         }
413         rcu_read_unlock();
414 
415         return false;
416 }
417 
418 static bool
419 ieee80211_chanctx_radar_required(struct ieee80211_local *local,
420                                  struct ieee80211_chanctx *ctx)
421 {
422         struct ieee80211_chanctx_conf *conf = &ctx->conf;
423         struct ieee80211_sub_if_data *sdata;
424         bool required = false;
425 
426         lockdep_assert_held(&local->chanctx_mtx);
427         lockdep_assert_held(&local->mtx);
428 
429         rcu_read_lock();
430         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
431                 if (!ieee80211_sdata_running(sdata))
432                         continue;
433                 if (rcu_access_pointer(sdata->vif.chanctx_conf) != conf)
434                         continue;
435                 if (!sdata->radar_required)
436                         continue;
437 
438                 required = true;
439                 break;
440         }
441         rcu_read_unlock();
442 
443         return required;
444 }
445 
446 static struct ieee80211_chanctx *
447 ieee80211_alloc_chanctx(struct ieee80211_local *local,
448                         const struct cfg80211_chan_def *chandef,
449                         enum ieee80211_chanctx_mode mode)
450 {
451         struct ieee80211_chanctx *ctx;
452 
453         lockdep_assert_held(&local->chanctx_mtx);
454 
455         ctx = kzalloc(sizeof(*ctx) + local->hw.chanctx_data_size, GFP_KERNEL);
456         if (!ctx)
457                 return NULL;
458 
459         INIT_LIST_HEAD(&ctx->assigned_vifs);
460         INIT_LIST_HEAD(&ctx->reserved_vifs);
461         ctx->conf.def = *chandef;
462         ctx->conf.rx_chains_static = 1;
463         ctx->conf.rx_chains_dynamic = 1;
464         ctx->mode = mode;
465         ctx->conf.radar_enabled = false;
466         ieee80211_recalc_chanctx_min_def(local, ctx);
467 
468         return ctx;
469 }
470 
471 static int ieee80211_add_chanctx(struct ieee80211_local *local,
472                                  struct ieee80211_chanctx *ctx)
473 {
474         u32 changed;
475         int err;
476 
477         lockdep_assert_held(&local->mtx);
478         lockdep_assert_held(&local->chanctx_mtx);
479 
480         if (!local->use_chanctx)
481                 local->hw.conf.radar_enabled = ctx->conf.radar_enabled;
482 
483         /* turn idle off *before* setting channel -- some drivers need that */
484         changed = ieee80211_idle_off(local);
485         if (changed)
486                 ieee80211_hw_config(local, changed);
487 
488         if (!local->use_chanctx) {
489                 local->_oper_chandef = ctx->conf.def;
490                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL);
491         } else {
492                 err = drv_add_chanctx(local, ctx);
493                 if (err) {
494                         ieee80211_recalc_idle(local);
495                         return err;
496                 }
497         }
498 
499         return 0;
500 }
501 
502 static struct ieee80211_chanctx *
503 ieee80211_new_chanctx(struct ieee80211_local *local,
504                       const struct cfg80211_chan_def *chandef,
505                       enum ieee80211_chanctx_mode mode)
506 {
507         struct ieee80211_chanctx *ctx;
508         int err;
509 
510         lockdep_assert_held(&local->mtx);
511         lockdep_assert_held(&local->chanctx_mtx);
512 
513         ctx = ieee80211_alloc_chanctx(local, chandef, mode);
514         if (!ctx)
515                 return ERR_PTR(-ENOMEM);
516 
517         err = ieee80211_add_chanctx(local, ctx);
518         if (err) {
519                 kfree(ctx);
520                 return ERR_PTR(err);
521         }
522 
523         list_add_rcu(&ctx->list, &local->chanctx_list);
524         return ctx;
525 }
526 
527 static void ieee80211_del_chanctx(struct ieee80211_local *local,
528                                   struct ieee80211_chanctx *ctx)
529 {
530         lockdep_assert_held(&local->chanctx_mtx);
531 
532         if (!local->use_chanctx) {
533                 struct cfg80211_chan_def *chandef = &local->_oper_chandef;
534                 chandef->width = NL80211_CHAN_WIDTH_20_NOHT;
535                 chandef->center_freq1 = chandef->chan->center_freq;
536                 chandef->center_freq2 = 0;
537 
538                 /* NOTE: Disabling radar is only valid here for
539                  * single channel context. To be sure, check it ...
540                  */
541                 WARN_ON(local->hw.conf.radar_enabled &&
542                         !list_empty(&local->chanctx_list));
543 
544                 local->hw.conf.radar_enabled = false;
545 
546                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL);
547         } else {
548                 drv_remove_chanctx(local, ctx);
549         }
550 
551         ieee80211_recalc_idle(local);
552 }
553 
554 static void ieee80211_free_chanctx(struct ieee80211_local *local,
555                                    struct ieee80211_chanctx *ctx)
556 {
557         lockdep_assert_held(&local->chanctx_mtx);
558 
559         WARN_ON_ONCE(ieee80211_chanctx_refcount(local, ctx) != 0);
560 
561         list_del_rcu(&ctx->list);
562         ieee80211_del_chanctx(local, ctx);
563         kfree_rcu(ctx, rcu_head);
564 }
565 
566 void ieee80211_recalc_chanctx_chantype(struct ieee80211_local *local,
567                                        struct ieee80211_chanctx *ctx)
568 {
569         struct ieee80211_chanctx_conf *conf = &ctx->conf;
570         struct ieee80211_sub_if_data *sdata;
571         const struct cfg80211_chan_def *compat = NULL;
572         struct sta_info *sta;
573 
574         lockdep_assert_held(&local->chanctx_mtx);
575 
576         rcu_read_lock();
577         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
578 
579                 if (!ieee80211_sdata_running(sdata))
580                         continue;
581                 if (rcu_access_pointer(sdata->vif.chanctx_conf) != conf)
582                         continue;
583                 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
584                         continue;
585 
586                 if (!compat)
587                         compat = &sdata->vif.bss_conf.chandef;
588 
589                 compat = cfg80211_chandef_compatible(
590                                 &sdata->vif.bss_conf.chandef, compat);
591                 if (WARN_ON_ONCE(!compat))
592                         break;
593         }
594 
595         /* TDLS peers can sometimes affect the chandef width */
596         list_for_each_entry_rcu(sta, &local->sta_list, list) {
597                 if (!sta->uploaded ||
598                     !test_sta_flag(sta, WLAN_STA_TDLS_WIDER_BW) ||
599                     !test_sta_flag(sta, WLAN_STA_AUTHORIZED) ||
600                     !sta->tdls_chandef.chan)
601                         continue;
602 
603                 compat = cfg80211_chandef_compatible(&sta->tdls_chandef,
604                                                      compat);
605                 if (WARN_ON_ONCE(!compat))
606                         break;
607         }
608         rcu_read_unlock();
609 
610         if (!compat)
611                 return;
612 
613         ieee80211_change_chanctx(local, ctx, compat);
614 }
615 
616 static void ieee80211_recalc_radar_chanctx(struct ieee80211_local *local,
617                                            struct ieee80211_chanctx *chanctx)
618 {
619         bool radar_enabled;
620 
621         lockdep_assert_held(&local->chanctx_mtx);
622         /* for ieee80211_is_radar_required */
623         lockdep_assert_held(&local->mtx);
624 
625         radar_enabled = ieee80211_chanctx_radar_required(local, chanctx);
626 
627         if (radar_enabled == chanctx->conf.radar_enabled)
628                 return;
629 
630         chanctx->conf.radar_enabled = radar_enabled;
631 
632         if (!local->use_chanctx) {
633                 local->hw.conf.radar_enabled = chanctx->conf.radar_enabled;
634                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL);
635         }
636 
637         drv_change_chanctx(local, chanctx, IEEE80211_CHANCTX_CHANGE_RADAR);
638 }
639 
640 static int ieee80211_assign_vif_chanctx(struct ieee80211_sub_if_data *sdata,
641                                         struct ieee80211_chanctx *new_ctx)
642 {
643         struct ieee80211_local *local = sdata->local;
644         struct ieee80211_chanctx_conf *conf;
645         struct ieee80211_chanctx *curr_ctx = NULL;
646         int ret = 0;
647 
648         if (WARN_ON(sdata->vif.type == NL80211_IFTYPE_NAN))
649                 return -ENOTSUPP;
650 
651         conf = rcu_dereference_protected(sdata->vif.chanctx_conf,
652                                          lockdep_is_held(&local->chanctx_mtx));
653 
654         if (conf) {
655                 curr_ctx = container_of(conf, struct ieee80211_chanctx, conf);
656 
657                 drv_unassign_vif_chanctx(local, sdata, curr_ctx);
658                 conf = NULL;
659                 list_del(&sdata->assigned_chanctx_list);
660         }
661 
662         if (new_ctx) {
663                 ret = drv_assign_vif_chanctx(local, sdata, new_ctx);
664                 if (ret)
665                         goto out;
666 
667                 conf = &new_ctx->conf;
668                 list_add(&sdata->assigned_chanctx_list,
669                          &new_ctx->assigned_vifs);
670         }
671 
672 out:
673         rcu_assign_pointer(sdata->vif.chanctx_conf, conf);
674 
675         sdata->vif.bss_conf.idle = !conf;
676 
677         if (curr_ctx && ieee80211_chanctx_num_assigned(local, curr_ctx) > 0) {
678                 ieee80211_recalc_chanctx_chantype(local, curr_ctx);
679                 ieee80211_recalc_smps_chanctx(local, curr_ctx);
680                 ieee80211_recalc_radar_chanctx(local, curr_ctx);
681                 ieee80211_recalc_chanctx_min_def(local, curr_ctx);
682         }
683 
684         if (new_ctx && ieee80211_chanctx_num_assigned(local, new_ctx) > 0) {
685                 ieee80211_recalc_txpower(sdata, false);
686                 ieee80211_recalc_chanctx_min_def(local, new_ctx);
687         }
688 
689         if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE &&
690             sdata->vif.type != NL80211_IFTYPE_MONITOR)
691                 ieee80211_bss_info_change_notify(sdata,
692                                                  BSS_CHANGED_IDLE);
693 
694         ieee80211_check_fast_xmit_iface(sdata);
695 
696         return ret;
697 }
698 
699 void ieee80211_recalc_smps_chanctx(struct ieee80211_local *local,
700                                    struct ieee80211_chanctx *chanctx)
701 {
702         struct ieee80211_sub_if_data *sdata;
703         u8 rx_chains_static, rx_chains_dynamic;
704 
705         lockdep_assert_held(&local->chanctx_mtx);
706 
707         rx_chains_static = 1;
708         rx_chains_dynamic = 1;
709 
710         rcu_read_lock();
711         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
712                 u8 needed_static, needed_dynamic;
713 
714                 if (!ieee80211_sdata_running(sdata))
715                         continue;
716 
717                 if (rcu_access_pointer(sdata->vif.chanctx_conf) !=
718                                                 &chanctx->conf)
719                         continue;
720 
721                 switch (sdata->vif.type) {
722                 case NL80211_IFTYPE_P2P_DEVICE:
723                 case NL80211_IFTYPE_NAN:
724                         continue;
725                 case NL80211_IFTYPE_STATION:
726                         if (!sdata->u.mgd.associated)
727                                 continue;
728                         break;
729                 case NL80211_IFTYPE_AP_VLAN:
730                         continue;
731                 case NL80211_IFTYPE_AP:
732                 case NL80211_IFTYPE_ADHOC:
733                 case NL80211_IFTYPE_WDS:
734                 case NL80211_IFTYPE_MESH_POINT:
735                 case NL80211_IFTYPE_OCB:
736                         break;
737                 default:
738                         WARN_ON_ONCE(1);
739                 }
740 
741                 switch (sdata->smps_mode) {
742                 default:
743                         WARN_ONCE(1, "Invalid SMPS mode %d\n",
744                                   sdata->smps_mode);
745                         /* fall through */
746                 case IEEE80211_SMPS_OFF:
747                         needed_static = sdata->needed_rx_chains;
748                         needed_dynamic = sdata->needed_rx_chains;
749                         break;
750                 case IEEE80211_SMPS_DYNAMIC:
751                         needed_static = 1;
752                         needed_dynamic = sdata->needed_rx_chains;
753                         break;
754                 case IEEE80211_SMPS_STATIC:
755                         needed_static = 1;
756                         needed_dynamic = 1;
757                         break;
758                 }
759 
760                 rx_chains_static = max(rx_chains_static, needed_static);
761                 rx_chains_dynamic = max(rx_chains_dynamic, needed_dynamic);
762         }
763 
764         /* Disable SMPS for the monitor interface */
765         sdata = rcu_dereference(local->monitor_sdata);
766         if (sdata &&
767             rcu_access_pointer(sdata->vif.chanctx_conf) == &chanctx->conf)
768                 rx_chains_dynamic = rx_chains_static = local->rx_chains;
769 
770         rcu_read_unlock();
771 
772         if (!local->use_chanctx) {
773                 if (rx_chains_static > 1)
774                         local->smps_mode = IEEE80211_SMPS_OFF;
775                 else if (rx_chains_dynamic > 1)
776                         local->smps_mode = IEEE80211_SMPS_DYNAMIC;
777                 else
778                         local->smps_mode = IEEE80211_SMPS_STATIC;
779                 ieee80211_hw_config(local, 0);
780         }
781 
782         if (rx_chains_static == chanctx->conf.rx_chains_static &&
783             rx_chains_dynamic == chanctx->conf.rx_chains_dynamic)
784                 return;
785 
786         chanctx->conf.rx_chains_static = rx_chains_static;
787         chanctx->conf.rx_chains_dynamic = rx_chains_dynamic;
788         drv_change_chanctx(local, chanctx, IEEE80211_CHANCTX_CHANGE_RX_CHAINS);
789 }
790 
791 static void
792 __ieee80211_vif_copy_chanctx_to_vlans(struct ieee80211_sub_if_data *sdata,
793                                       bool clear)
794 {
795         struct ieee80211_local *local __maybe_unused = sdata->local;
796         struct ieee80211_sub_if_data *vlan;
797         struct ieee80211_chanctx_conf *conf;
798 
799         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_AP))
800                 return;
801 
802         lockdep_assert_held(&local->mtx);
803 
804         /* Check that conf exists, even when clearing this function
805          * must be called with the AP's channel context still there
806          * as it would otherwise cause VLANs to have an invalid
807          * channel context pointer for a while, possibly pointing
808          * to a channel context that has already been freed.
809          */
810         conf = rcu_dereference_protected(sdata->vif.chanctx_conf,
811                                          lockdep_is_held(&local->chanctx_mtx));
812         WARN_ON(!conf);
813 
814         if (clear)
815                 conf = NULL;
816 
817         list_for_each_entry(vlan, &sdata->u.ap.vlans, u.vlan.list)
818                 rcu_assign_pointer(vlan->vif.chanctx_conf, conf);
819 }
820 
821 void ieee80211_vif_copy_chanctx_to_vlans(struct ieee80211_sub_if_data *sdata,
822                                          bool clear)
823 {
824         struct ieee80211_local *local = sdata->local;
825 
826         mutex_lock(&local->chanctx_mtx);
827 
828         __ieee80211_vif_copy_chanctx_to_vlans(sdata, clear);
829 
830         mutex_unlock(&local->chanctx_mtx);
831 }
832 
833 int ieee80211_vif_unreserve_chanctx(struct ieee80211_sub_if_data *sdata)
834 {
835         struct ieee80211_chanctx *ctx = sdata->reserved_chanctx;
836 
837         lockdep_assert_held(&sdata->local->chanctx_mtx);
838 
839         if (WARN_ON(!ctx))
840                 return -EINVAL;
841 
842         list_del(&sdata->reserved_chanctx_list);
843         sdata->reserved_chanctx = NULL;
844 
845         if (ieee80211_chanctx_refcount(sdata->local, ctx) == 0) {
846                 if (ctx->replace_state == IEEE80211_CHANCTX_REPLACES_OTHER) {
847                         if (WARN_ON(!ctx->replace_ctx))
848                                 return -EINVAL;
849 
850                         WARN_ON(ctx->replace_ctx->replace_state !=
851                                 IEEE80211_CHANCTX_WILL_BE_REPLACED);
852                         WARN_ON(ctx->replace_ctx->replace_ctx != ctx);
853 
854                         ctx->replace_ctx->replace_ctx = NULL;
855                         ctx->replace_ctx->replace_state =
856                                         IEEE80211_CHANCTX_REPLACE_NONE;
857 
858                         list_del_rcu(&ctx->list);
859                         kfree_rcu(ctx, rcu_head);
860                 } else {
861                         ieee80211_free_chanctx(sdata->local, ctx);
862                 }
863         }
864 
865         return 0;
866 }
867 
868 int ieee80211_vif_reserve_chanctx(struct ieee80211_sub_if_data *sdata,
869                                   const struct cfg80211_chan_def *chandef,
870                                   enum ieee80211_chanctx_mode mode,
871                                   bool radar_required)
872 {
873         struct ieee80211_local *local = sdata->local;
874         struct ieee80211_chanctx *new_ctx, *curr_ctx, *ctx;
875 
876         lockdep_assert_held(&local->chanctx_mtx);
877 
878         curr_ctx = ieee80211_vif_get_chanctx(sdata);
879         if (curr_ctx && local->use_chanctx && !local->ops->switch_vif_chanctx)
880                 return -ENOTSUPP;
881 
882         new_ctx = ieee80211_find_reservation_chanctx(local, chandef, mode);
883         if (!new_ctx) {
884                 if (ieee80211_can_create_new_chanctx(local)) {
885                         new_ctx = ieee80211_new_chanctx(local, chandef, mode);
886                         if (IS_ERR(new_ctx))
887                                 return PTR_ERR(new_ctx);
888                 } else {
889                         if (!curr_ctx ||
890                             (curr_ctx->replace_state ==
891                              IEEE80211_CHANCTX_WILL_BE_REPLACED) ||
892                             !list_empty(&curr_ctx->reserved_vifs)) {
893                                 /*
894                                  * Another vif already requested this context
895                                  * for a reservation. Find another one hoping
896                                  * all vifs assigned to it will also switch
897                                  * soon enough.
898                                  *
899                                  * TODO: This needs a little more work as some
900                                  * cases (more than 2 chanctx capable devices)
901                                  * may fail which could otherwise succeed
902                                  * provided some channel context juggling was
903                                  * performed.
904                                  *
905                                  * Consider ctx1..3, vif1..6, each ctx has 2
906                                  * vifs. vif1 and vif2 from ctx1 request new
907                                  * different chandefs starting 2 in-place
908                                  * reserations with ctx4 and ctx5 replacing
909                                  * ctx1 and ctx2 respectively. Next vif5 and
910                                  * vif6 from ctx3 reserve ctx4. If vif3 and
911                                  * vif4 remain on ctx2 as they are then this
912                                  * fails unless `replace_ctx` from ctx5 is
913                                  * replaced with ctx3.
914                                  */
915                                 list_for_each_entry(ctx, &local->chanctx_list,
916                                                     list) {
917                                         if (ctx->replace_state !=
918                                             IEEE80211_CHANCTX_REPLACE_NONE)
919                                                 continue;
920 
921                                         if (!list_empty(&ctx->reserved_vifs))
922                                                 continue;
923 
924                                         curr_ctx = ctx;
925                                         break;
926                                 }
927                         }
928 
929                         /*
930                          * If that's true then all available contexts already
931                          * have reservations and cannot be used.
932                          */
933                         if (!curr_ctx ||
934                             (curr_ctx->replace_state ==
935                              IEEE80211_CHANCTX_WILL_BE_REPLACED) ||
936                             !list_empty(&curr_ctx->reserved_vifs))
937                                 return -EBUSY;
938 
939                         new_ctx = ieee80211_alloc_chanctx(local, chandef, mode);
940                         if (!new_ctx)
941                                 return -ENOMEM;
942 
943                         new_ctx->replace_ctx = curr_ctx;
944                         new_ctx->replace_state =
945                                         IEEE80211_CHANCTX_REPLACES_OTHER;
946 
947                         curr_ctx->replace_ctx = new_ctx;
948                         curr_ctx->replace_state =
949                                         IEEE80211_CHANCTX_WILL_BE_REPLACED;
950 
951                         list_add_rcu(&new_ctx->list, &local->chanctx_list);
952                 }
953         }
954 
955         list_add(&sdata->reserved_chanctx_list, &new_ctx->reserved_vifs);
956         sdata->reserved_chanctx = new_ctx;
957         sdata->reserved_chandef = *chandef;
958         sdata->reserved_radar_required = radar_required;
959         sdata->reserved_ready = false;
960 
961         return 0;
962 }
963 
964 static void
965 ieee80211_vif_chanctx_reservation_complete(struct ieee80211_sub_if_data *sdata)
966 {
967         switch (sdata->vif.type) {
968         case NL80211_IFTYPE_ADHOC:
969         case NL80211_IFTYPE_AP:
970         case NL80211_IFTYPE_MESH_POINT:
971         case NL80211_IFTYPE_OCB:
972                 ieee80211_queue_work(&sdata->local->hw,
973                                      &sdata->csa_finalize_work);
974                 break;
975         case NL80211_IFTYPE_STATION:
976                 ieee80211_queue_work(&sdata->local->hw,
977                                      &sdata->u.mgd.chswitch_work);
978                 break;
979         case NL80211_IFTYPE_UNSPECIFIED:
980         case NL80211_IFTYPE_AP_VLAN:
981         case NL80211_IFTYPE_WDS:
982         case NL80211_IFTYPE_MONITOR:
983         case NL80211_IFTYPE_P2P_CLIENT:
984         case NL80211_IFTYPE_P2P_GO:
985         case NL80211_IFTYPE_P2P_DEVICE:
986         case NL80211_IFTYPE_NAN:
987         case NUM_NL80211_IFTYPES:
988                 WARN_ON(1);
989                 break;
990         }
991 }
992 
993 static void
994 ieee80211_vif_update_chandef(struct ieee80211_sub_if_data *sdata,
995                              const struct cfg80211_chan_def *chandef)
996 {
997         struct ieee80211_sub_if_data *vlan;
998 
999         sdata->vif.bss_conf.chandef = *chandef;
1000 
1001         if (sdata->vif.type != NL80211_IFTYPE_AP)
1002                 return;
1003 
1004         list_for_each_entry(vlan, &sdata->u.ap.vlans, u.vlan.list)
1005                 vlan->vif.bss_conf.chandef = *chandef;
1006 }
1007 
1008 static int
1009 ieee80211_vif_use_reserved_reassign(struct ieee80211_sub_if_data *sdata)
1010 {
1011         struct ieee80211_local *local = sdata->local;
1012         struct ieee80211_vif_chanctx_switch vif_chsw[1] = {};
1013         struct ieee80211_chanctx *old_ctx, *new_ctx;
1014         const struct cfg80211_chan_def *chandef;
1015         u32 changed = 0;
1016         int err;
1017 
1018         lockdep_assert_held(&local->mtx);
1019         lockdep_assert_held(&local->chanctx_mtx);
1020 
1021         new_ctx = sdata->reserved_chanctx;
1022         old_ctx = ieee80211_vif_get_chanctx(sdata);
1023 
1024         if (WARN_ON(!sdata->reserved_ready))
1025                 return -EBUSY;
1026 
1027         if (WARN_ON(!new_ctx))
1028                 return -EINVAL;
1029 
1030         if (WARN_ON(!old_ctx))
1031                 return -EINVAL;
1032 
1033         if (WARN_ON(new_ctx->replace_state ==
1034                     IEEE80211_CHANCTX_REPLACES_OTHER))
1035                 return -EINVAL;
1036 
1037         chandef = ieee80211_chanctx_non_reserved_chandef(local, new_ctx,
1038                                 &sdata->reserved_chandef);
1039         if (WARN_ON(!chandef))
1040                 return -EINVAL;
1041 
1042         ieee80211_change_chanctx(local, new_ctx, chandef);
1043 
1044         vif_chsw[0].vif = &sdata->vif;
1045         vif_chsw[0].old_ctx = &old_ctx->conf;
1046         vif_chsw[0].new_ctx = &new_ctx->conf;
1047 
1048         list_del(&sdata->reserved_chanctx_list);
1049         sdata->reserved_chanctx = NULL;
1050 
1051         err = drv_switch_vif_chanctx(local, vif_chsw, 1,
1052                                      CHANCTX_SWMODE_REASSIGN_VIF);
1053         if (err) {
1054                 if (ieee80211_chanctx_refcount(local, new_ctx) == 0)
1055                         ieee80211_free_chanctx(local, new_ctx);
1056 
1057                 goto out;
1058         }
1059 
1060         list_move(&sdata->assigned_chanctx_list, &new_ctx->assigned_vifs);
1061         rcu_assign_pointer(sdata->vif.chanctx_conf, &new_ctx->conf);
1062 
1063         if (sdata->vif.type == NL80211_IFTYPE_AP)
1064                 __ieee80211_vif_copy_chanctx_to_vlans(sdata, false);
1065 
1066         ieee80211_check_fast_xmit_iface(sdata);
1067 
1068         if (ieee80211_chanctx_refcount(local, old_ctx) == 0)
1069                 ieee80211_free_chanctx(local, old_ctx);
1070 
1071         if (sdata->vif.bss_conf.chandef.width != sdata->reserved_chandef.width)
1072                 changed = BSS_CHANGED_BANDWIDTH;
1073 
1074         ieee80211_vif_update_chandef(sdata, &sdata->reserved_chandef);
1075 
1076         ieee80211_recalc_smps_chanctx(local, new_ctx);
1077         ieee80211_recalc_radar_chanctx(local, new_ctx);
1078         ieee80211_recalc_chanctx_min_def(local, new_ctx);
1079 
1080         if (changed)
1081                 ieee80211_bss_info_change_notify(sdata, changed);
1082 
1083 out:
1084         ieee80211_vif_chanctx_reservation_complete(sdata);
1085         return err;
1086 }
1087 
1088 static int
1089 ieee80211_vif_use_reserved_assign(struct ieee80211_sub_if_data *sdata)
1090 {
1091         struct ieee80211_local *local = sdata->local;
1092         struct ieee80211_chanctx *old_ctx, *new_ctx;
1093         const struct cfg80211_chan_def *chandef;
1094         int err;
1095 
1096         old_ctx = ieee80211_vif_get_chanctx(sdata);
1097         new_ctx = sdata->reserved_chanctx;
1098 
1099         if (WARN_ON(!sdata->reserved_ready))
1100                 return -EINVAL;
1101 
1102         if (WARN_ON(old_ctx))
1103                 return -EINVAL;
1104 
1105         if (WARN_ON(!new_ctx))
1106                 return -EINVAL;
1107 
1108         if (WARN_ON(new_ctx->replace_state ==
1109                     IEEE80211_CHANCTX_REPLACES_OTHER))
1110                 return -EINVAL;
1111 
1112         chandef = ieee80211_chanctx_non_reserved_chandef(local, new_ctx,
1113                                 &sdata->reserved_chandef);
1114         if (WARN_ON(!chandef))
1115                 return -EINVAL;
1116 
1117         ieee80211_change_chanctx(local, new_ctx, chandef);
1118 
1119         list_del(&sdata->reserved_chanctx_list);
1120         sdata->reserved_chanctx = NULL;
1121 
1122         err = ieee80211_assign_vif_chanctx(sdata, new_ctx);
1123         if (err) {
1124                 if (ieee80211_chanctx_refcount(local, new_ctx) == 0)
1125                         ieee80211_free_chanctx(local, new_ctx);
1126 
1127                 goto out;
1128         }
1129 
1130 out:
1131         ieee80211_vif_chanctx_reservation_complete(sdata);
1132         return err;
1133 }
1134 
1135 static bool
1136 ieee80211_vif_has_in_place_reservation(struct ieee80211_sub_if_data *sdata)
1137 {
1138         struct ieee80211_chanctx *old_ctx, *new_ctx;
1139 
1140         lockdep_assert_held(&sdata->local->chanctx_mtx);
1141 
1142         new_ctx = sdata->reserved_chanctx;
1143         old_ctx = ieee80211_vif_get_chanctx(sdata);
1144 
1145         if (!old_ctx)
1146                 return false;
1147 
1148         if (WARN_ON(!new_ctx))
1149                 return false;
1150 
1151         if (old_ctx->replace_state != IEEE80211_CHANCTX_WILL_BE_REPLACED)
1152                 return false;
1153 
1154         if (new_ctx->replace_state != IEEE80211_CHANCTX_REPLACES_OTHER)
1155                 return false;
1156 
1157         return true;
1158 }
1159 
1160 static int ieee80211_chsw_switch_hwconf(struct ieee80211_local *local,
1161                                         struct ieee80211_chanctx *new_ctx)
1162 {
1163         const struct cfg80211_chan_def *chandef;
1164 
1165         lockdep_assert_held(&local->mtx);
1166         lockdep_assert_held(&local->chanctx_mtx);
1167 
1168         chandef = ieee80211_chanctx_reserved_chandef(local, new_ctx, NULL);
1169         if (WARN_ON(!chandef))
1170                 return -EINVAL;
1171 
1172         local->hw.conf.radar_enabled = new_ctx->conf.radar_enabled;
1173         local->_oper_chandef = *chandef;
1174         ieee80211_hw_config(local, 0);
1175 
1176         return 0;
1177 }
1178 
1179 static int ieee80211_chsw_switch_vifs(struct ieee80211_local *local,
1180                                       int n_vifs)
1181 {
1182         struct ieee80211_vif_chanctx_switch *vif_chsw;
1183         struct ieee80211_sub_if_data *sdata;
1184         struct ieee80211_chanctx *ctx, *old_ctx;
1185         int i, err;
1186 
1187         lockdep_assert_held(&local->mtx);
1188         lockdep_assert_held(&local->chanctx_mtx);
1189 
1190         vif_chsw = kcalloc(n_vifs, sizeof(vif_chsw[0]), GFP_KERNEL);
1191         if (!vif_chsw)
1192                 return -ENOMEM;
1193 
1194         i = 0;
1195         list_for_each_entry(ctx, &local->chanctx_list, list) {
1196                 if (ctx->replace_state != IEEE80211_CHANCTX_REPLACES_OTHER)
1197                         continue;
1198 
1199                 if (WARN_ON(!ctx->replace_ctx)) {
1200                         err = -EINVAL;
1201                         goto out;
1202                 }
1203 
1204                 list_for_each_entry(sdata, &ctx->reserved_vifs,
1205                                     reserved_chanctx_list) {
1206                         if (!ieee80211_vif_has_in_place_reservation(
1207                                         sdata))
1208                                 continue;
1209 
1210                         old_ctx = ieee80211_vif_get_chanctx(sdata);
1211                         vif_chsw[i].vif = &sdata->vif;
1212                         vif_chsw[i].old_ctx = &old_ctx->conf;
1213                         vif_chsw[i].new_ctx = &ctx->conf;
1214 
1215                         i++;
1216                 }
1217         }
1218 
1219         err = drv_switch_vif_chanctx(local, vif_chsw, n_vifs,
1220                                      CHANCTX_SWMODE_SWAP_CONTEXTS);
1221 
1222 out:
1223         kfree(vif_chsw);
1224         return err;
1225 }
1226 
1227 static int ieee80211_chsw_switch_ctxs(struct ieee80211_local *local)
1228 {
1229         struct ieee80211_chanctx *ctx;
1230         int err;
1231 
1232         lockdep_assert_held(&local->mtx);
1233         lockdep_assert_held(&local->chanctx_mtx);
1234 
1235         list_for_each_entry(ctx, &local->chanctx_list, list) {
1236                 if (ctx->replace_state != IEEE80211_CHANCTX_REPLACES_OTHER)
1237                         continue;
1238 
1239                 if (!list_empty(&ctx->replace_ctx->assigned_vifs))
1240                         continue;
1241 
1242                 ieee80211_del_chanctx(local, ctx->replace_ctx);
1243                 err = ieee80211_add_chanctx(local, ctx);
1244                 if (err)
1245                         goto err;
1246         }
1247 
1248         return 0;
1249 
1250 err:
1251         WARN_ON(ieee80211_add_chanctx(local, ctx));
1252         list_for_each_entry_continue_reverse(ctx, &local->chanctx_list, list) {
1253                 if (ctx->replace_state != IEEE80211_CHANCTX_REPLACES_OTHER)
1254                         continue;
1255 
1256                 if (!list_empty(&ctx->replace_ctx->assigned_vifs))
1257                         continue;
1258 
1259                 ieee80211_del_chanctx(local, ctx);
1260                 WARN_ON(ieee80211_add_chanctx(local, ctx->replace_ctx));
1261         }
1262 
1263         return err;
1264 }
1265 
1266 static int ieee80211_vif_use_reserved_switch(struct ieee80211_local *local)
1267 {
1268         struct ieee80211_sub_if_data *sdata, *sdata_tmp;
1269         struct ieee80211_chanctx *ctx, *ctx_tmp, *old_ctx;
1270         struct ieee80211_chanctx *new_ctx = NULL;
1271         int err, n_assigned, n_reserved, n_ready;
1272         int n_ctx = 0, n_vifs_switch = 0, n_vifs_assign = 0, n_vifs_ctxless = 0;
1273 
1274         lockdep_assert_held(&local->mtx);
1275         lockdep_assert_held(&local->chanctx_mtx);
1276 
1277         /*
1278          * If there are 2 independent pairs of channel contexts performing
1279          * cross-switch of their vifs this code will still wait until both are
1280          * ready even though it could be possible to switch one before the
1281          * other is ready.
1282          *
1283          * For practical reasons and code simplicity just do a single huge
1284          * switch.
1285          */
1286 
1287         /*
1288          * Verify if the reservation is still feasible.
1289          *  - if it's not then disconnect
1290          *  - if it is but not all vifs necessary are ready then defer
1291          */
1292 
1293         list_for_each_entry(ctx, &local->chanctx_list, list) {
1294                 if (ctx->replace_state != IEEE80211_CHANCTX_REPLACES_OTHER)
1295                         continue;
1296 
1297                 if (WARN_ON(!ctx->replace_ctx)) {
1298                         err = -EINVAL;
1299                         goto err;
1300                 }
1301 
1302                 if (!local->use_chanctx)
1303                         new_ctx = ctx;
1304 
1305                 n_ctx++;
1306 
1307                 n_assigned = 0;
1308                 n_reserved = 0;
1309                 n_ready = 0;
1310 
1311                 list_for_each_entry(sdata, &ctx->replace_ctx->assigned_vifs,
1312                                     assigned_chanctx_list) {
1313                         n_assigned++;
1314                         if (sdata->reserved_chanctx) {
1315                                 n_reserved++;
1316                                 if (sdata->reserved_ready)
1317                                         n_ready++;
1318                         }
1319                 }
1320 
1321                 if (n_assigned != n_reserved) {
1322                         if (n_ready == n_reserved) {
1323                                 wiphy_info(local->hw.wiphy,
1324                                            "channel context reservation cannot be finalized because some interfaces aren't switching\n");
1325                                 err = -EBUSY;
1326                                 goto err;
1327                         }
1328 
1329                         return -EAGAIN;
1330                 }
1331 
1332                 ctx->conf.radar_enabled = false;
1333                 list_for_each_entry(sdata, &ctx->reserved_vifs,
1334                                     reserved_chanctx_list) {
1335                         if (ieee80211_vif_has_in_place_reservation(sdata) &&
1336                             !sdata->reserved_ready)
1337                                 return -EAGAIN;
1338 
1339                         old_ctx = ieee80211_vif_get_chanctx(sdata);
1340                         if (old_ctx) {
1341                                 if (old_ctx->replace_state ==
1342                                     IEEE80211_CHANCTX_WILL_BE_REPLACED)
1343                                         n_vifs_switch++;
1344                                 else
1345                                         n_vifs_assign++;
1346                         } else {
1347                                 n_vifs_ctxless++;
1348                         }
1349 
1350                         if (sdata->reserved_radar_required)
1351                                 ctx->conf.radar_enabled = true;
1352                 }
1353         }
1354 
1355         if (WARN_ON(n_ctx == 0) ||
1356             WARN_ON(n_vifs_switch == 0 &&
1357                     n_vifs_assign == 0 &&
1358                     n_vifs_ctxless == 0) ||
1359             WARN_ON(n_ctx > 1 && !local->use_chanctx) ||
1360             WARN_ON(!new_ctx && !local->use_chanctx)) {
1361                 err = -EINVAL;
1362                 goto err;
1363         }
1364 
1365         /*
1366          * All necessary vifs are ready. Perform the switch now depending on
1367          * reservations and driver capabilities.
1368          */
1369 
1370         if (local->use_chanctx) {
1371                 if (n_vifs_switch > 0) {
1372                         err = ieee80211_chsw_switch_vifs(local, n_vifs_switch);
1373                         if (err)
1374                                 goto err;
1375                 }
1376 
1377                 if (n_vifs_assign > 0 || n_vifs_ctxless > 0) {
1378                         err = ieee80211_chsw_switch_ctxs(local);
1379                         if (err)
1380                                 goto err;
1381                 }
1382         } else {
1383                 err = ieee80211_chsw_switch_hwconf(local, new_ctx);
1384                 if (err)
1385                         goto err;
1386         }
1387 
1388         /*
1389          * Update all structures, values and pointers to point to new channel
1390          * context(s).
1391          */
1392         list_for_each_entry(ctx, &local->chanctx_list, list) {
1393                 if (ctx->replace_state != IEEE80211_CHANCTX_REPLACES_OTHER)
1394                         continue;
1395 
1396                 if (WARN_ON(!ctx->replace_ctx)) {
1397                         err = -EINVAL;
1398                         goto err;
1399                 }
1400 
1401                 list_for_each_entry(sdata, &ctx->reserved_vifs,
1402                                     reserved_chanctx_list) {
1403                         u32 changed = 0;
1404 
1405                         if (!ieee80211_vif_has_in_place_reservation(sdata))
1406                                 continue;
1407 
1408                         rcu_assign_pointer(sdata->vif.chanctx_conf, &ctx->conf);
1409 
1410                         if (sdata->vif.type == NL80211_IFTYPE_AP)
1411                                 __ieee80211_vif_copy_chanctx_to_vlans(sdata,
1412                                                                       false);
1413 
1414                         ieee80211_check_fast_xmit_iface(sdata);
1415 
1416                         sdata->radar_required = sdata->reserved_radar_required;
1417 
1418                         if (sdata->vif.bss_conf.chandef.width !=
1419                             sdata->reserved_chandef.width)
1420                                 changed = BSS_CHANGED_BANDWIDTH;
1421 
1422                         ieee80211_vif_update_chandef(sdata, &sdata->reserved_chandef);
1423                         if (changed)
1424                                 ieee80211_bss_info_change_notify(sdata,
1425                                                                  changed);
1426 
1427                         ieee80211_recalc_txpower(sdata, false);
1428                 }
1429 
1430                 ieee80211_recalc_chanctx_chantype(local, ctx);
1431                 ieee80211_recalc_smps_chanctx(local, ctx);
1432                 ieee80211_recalc_radar_chanctx(local, ctx);
1433                 ieee80211_recalc_chanctx_min_def(local, ctx);
1434 
1435                 list_for_each_entry_safe(sdata, sdata_tmp, &ctx->reserved_vifs,
1436                                          reserved_chanctx_list) {
1437                         if (ieee80211_vif_get_chanctx(sdata) != ctx)
1438                                 continue;
1439 
1440                         list_del(&sdata->reserved_chanctx_list);
1441                         list_move(&sdata->assigned_chanctx_list,
1442                                   &ctx->assigned_vifs);
1443                         sdata->reserved_chanctx = NULL;
1444 
1445                         ieee80211_vif_chanctx_reservation_complete(sdata);
1446                 }
1447 
1448                 /*
1449                  * This context might have been a dependency for an already
1450                  * ready re-assign reservation interface that was deferred. Do
1451                  * not propagate error to the caller though. The in-place
1452                  * reservation for originally requested interface has already
1453                  * succeeded at this point.
1454                  */
1455                 list_for_each_entry_safe(sdata, sdata_tmp, &ctx->reserved_vifs,
1456                                          reserved_chanctx_list) {
1457                         if (WARN_ON(ieee80211_vif_has_in_place_reservation(
1458                                         sdata)))
1459                                 continue;
1460 
1461                         if (WARN_ON(sdata->reserved_chanctx != ctx))
1462                                 continue;
1463 
1464                         if (!sdata->reserved_ready)
1465                                 continue;
1466 
1467                         if (ieee80211_vif_get_chanctx(sdata))
1468                                 err = ieee80211_vif_use_reserved_reassign(
1469                                                 sdata);
1470                         else
1471                                 err = ieee80211_vif_use_reserved_assign(sdata);
1472 
1473                         if (err) {
1474                                 sdata_info(sdata,
1475                                            "failed to finalize (re-)assign reservation (err=%d)\n",
1476                                            err);
1477                                 ieee80211_vif_unreserve_chanctx(sdata);
1478                                 cfg80211_stop_iface(local->hw.wiphy,
1479                                                     &sdata->wdev,
1480                                                     GFP_KERNEL);
1481                         }
1482                 }
1483         }
1484 
1485         /*
1486          * Finally free old contexts
1487          */
1488 
1489         list_for_each_entry_safe(ctx, ctx_tmp, &local->chanctx_list, list) {
1490                 if (ctx->replace_state != IEEE80211_CHANCTX_WILL_BE_REPLACED)
1491                         continue;
1492 
1493                 ctx->replace_ctx->replace_ctx = NULL;
1494                 ctx->replace_ctx->replace_state =
1495                                 IEEE80211_CHANCTX_REPLACE_NONE;
1496 
1497                 list_del_rcu(&ctx->list);
1498                 kfree_rcu(ctx, rcu_head);
1499         }
1500 
1501         return 0;
1502 
1503 err:
1504         list_for_each_entry(ctx, &local->chanctx_list, list) {
1505                 if (ctx->replace_state != IEEE80211_CHANCTX_REPLACES_OTHER)
1506                         continue;
1507 
1508                 list_for_each_entry_safe(sdata, sdata_tmp, &ctx->reserved_vifs,
1509                                          reserved_chanctx_list) {
1510                         ieee80211_vif_unreserve_chanctx(sdata);
1511                         ieee80211_vif_chanctx_reservation_complete(sdata);
1512                 }
1513         }
1514 
1515         return err;
1516 }
1517 
1518 static void __ieee80211_vif_release_channel(struct ieee80211_sub_if_data *sdata)
1519 {
1520         struct ieee80211_local *local = sdata->local;
1521         struct ieee80211_chanctx_conf *conf;
1522         struct ieee80211_chanctx *ctx;
1523         bool use_reserved_switch = false;
1524 
1525         lockdep_assert_held(&local->chanctx_mtx);
1526 
1527         conf = rcu_dereference_protected(sdata->vif.chanctx_conf,
1528                                          lockdep_is_held(&local->chanctx_mtx));
1529         if (!conf)
1530                 return;
1531 
1532         ctx = container_of(conf, struct ieee80211_chanctx, conf);
1533 
1534         if (sdata->reserved_chanctx) {
1535                 if (sdata->reserved_chanctx->replace_state ==
1536                     IEEE80211_CHANCTX_REPLACES_OTHER &&
1537                     ieee80211_chanctx_num_reserved(local,
1538                                                    sdata->reserved_chanctx) > 1)
1539                         use_reserved_switch = true;
1540 
1541                 ieee80211_vif_unreserve_chanctx(sdata);
1542         }
1543 
1544         ieee80211_assign_vif_chanctx(sdata, NULL);
1545         if (ieee80211_chanctx_refcount(local, ctx) == 0)
1546                 ieee80211_free_chanctx(local, ctx);
1547 
1548         sdata->radar_required = false;
1549 
1550         /* Unreserving may ready an in-place reservation. */
1551         if (use_reserved_switch)
1552                 ieee80211_vif_use_reserved_switch(local);
1553 }
1554 
1555 int ieee80211_vif_use_channel(struct ieee80211_sub_if_data *sdata,
1556                               const struct cfg80211_chan_def *chandef,
1557                               enum ieee80211_chanctx_mode mode)
1558 {
1559         struct ieee80211_local *local = sdata->local;
1560         struct ieee80211_chanctx *ctx;
1561         u8 radar_detect_width = 0;
1562         int ret;
1563 
1564         lockdep_assert_held(&local->mtx);
1565 
1566         WARN_ON(sdata->dev && netif_carrier_ok(sdata->dev));
1567 
1568         mutex_lock(&local->chanctx_mtx);
1569 
1570         ret = cfg80211_chandef_dfs_required(local->hw.wiphy,
1571                                             chandef,
1572                                             sdata->wdev.iftype);
1573         if (ret < 0)
1574                 goto out;
1575         if (ret > 0)
1576                 radar_detect_width = BIT(chandef->width);
1577 
1578         sdata->radar_required = ret;
1579 
1580         ret = ieee80211_check_combinations(sdata, chandef, mode,
1581                                            radar_detect_width);
1582         if (ret < 0)
1583                 goto out;
1584 
1585         __ieee80211_vif_release_channel(sdata);
1586 
1587         ctx = ieee80211_find_chanctx(local, chandef, mode);
1588         if (!ctx)
1589                 ctx = ieee80211_new_chanctx(local, chandef, mode);
1590         if (IS_ERR(ctx)) {
1591                 ret = PTR_ERR(ctx);
1592                 goto out;
1593         }
1594 
1595         ieee80211_vif_update_chandef(sdata, chandef);
1596 
1597         ret = ieee80211_assign_vif_chanctx(sdata, ctx);
1598         if (ret) {
1599                 /* if assign fails refcount stays the same */
1600                 if (ieee80211_chanctx_refcount(local, ctx) == 0)
1601                         ieee80211_free_chanctx(local, ctx);
1602                 goto out;
1603         }
1604 
1605         ieee80211_recalc_smps_chanctx(local, ctx);
1606         ieee80211_recalc_radar_chanctx(local, ctx);
1607  out:
1608         if (ret)
1609                 sdata->radar_required = false;
1610 
1611         mutex_unlock(&local->chanctx_mtx);
1612         return ret;
1613 }
1614 
1615 int ieee80211_vif_use_reserved_context(struct ieee80211_sub_if_data *sdata)
1616 {
1617         struct ieee80211_local *local = sdata->local;
1618         struct ieee80211_chanctx *new_ctx;
1619         struct ieee80211_chanctx *old_ctx;
1620         int err;
1621 
1622         lockdep_assert_held(&local->mtx);
1623         lockdep_assert_held(&local->chanctx_mtx);
1624 
1625         new_ctx = sdata->reserved_chanctx;
1626         old_ctx = ieee80211_vif_get_chanctx(sdata);
1627 
1628         if (WARN_ON(!new_ctx))
1629                 return -EINVAL;
1630 
1631         if (WARN_ON(new_ctx->replace_state ==
1632                     IEEE80211_CHANCTX_WILL_BE_REPLACED))
1633                 return -EINVAL;
1634 
1635         if (WARN_ON(sdata->reserved_ready))
1636                 return -EINVAL;
1637 
1638         sdata->reserved_ready = true;
1639 
1640         if (new_ctx->replace_state == IEEE80211_CHANCTX_REPLACE_NONE) {
1641                 if (old_ctx)
1642                         err = ieee80211_vif_use_reserved_reassign(sdata);
1643                 else
1644                         err = ieee80211_vif_use_reserved_assign(sdata);
1645 
1646                 if (err)
1647                         return err;
1648         }
1649 
1650         /*
1651          * In-place reservation may need to be finalized now either if:
1652          *  a) sdata is taking part in the swapping itself and is the last one
1653          *  b) sdata has switched with a re-assign reservation to an existing
1654          *     context readying in-place switching of old_ctx
1655          *
1656          * In case of (b) do not propagate the error up because the requested
1657          * sdata already switched successfully. Just spill an extra warning.
1658          * The ieee80211_vif_use_reserved_switch() already stops all necessary
1659          * interfaces upon failure.
1660          */
1661         if ((old_ctx &&
1662              old_ctx->replace_state == IEEE80211_CHANCTX_WILL_BE_REPLACED) ||
1663             new_ctx->replace_state == IEEE80211_CHANCTX_REPLACES_OTHER) {
1664                 err = ieee80211_vif_use_reserved_switch(local);
1665                 if (err && err != -EAGAIN) {
1666                         if (new_ctx->replace_state ==
1667                             IEEE80211_CHANCTX_REPLACES_OTHER)
1668                                 return err;
1669 
1670                         wiphy_info(local->hw.wiphy,
1671                                    "depending in-place reservation failed (err=%d)\n",
1672                                    err);
1673                 }
1674         }
1675 
1676         return 0;
1677 }
1678 
1679 int ieee80211_vif_change_bandwidth(struct ieee80211_sub_if_data *sdata,
1680                                    const struct cfg80211_chan_def *chandef,
1681                                    u32 *changed)
1682 {
1683         struct ieee80211_local *local = sdata->local;
1684         struct ieee80211_chanctx_conf *conf;
1685         struct ieee80211_chanctx *ctx;
1686         const struct cfg80211_chan_def *compat;
1687         int ret;
1688 
1689         if (!cfg80211_chandef_usable(sdata->local->hw.wiphy, chandef,
1690                                      IEEE80211_CHAN_DISABLED))
1691                 return -EINVAL;
1692 
1693         mutex_lock(&local->chanctx_mtx);
1694         if (cfg80211_chandef_identical(chandef, &sdata->vif.bss_conf.chandef)) {
1695                 ret = 0;
1696                 goto out;
1697         }
1698 
1699         if (chandef->width == NL80211_CHAN_WIDTH_20_NOHT ||
1700             sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_20_NOHT) {
1701                 ret = -EINVAL;
1702                 goto out;
1703         }
1704 
1705         conf = rcu_dereference_protected(sdata->vif.chanctx_conf,
1706                                          lockdep_is_held(&local->chanctx_mtx));
1707         if (!conf) {
1708                 ret = -EINVAL;
1709                 goto out;
1710         }
1711 
1712         ctx = container_of(conf, struct ieee80211_chanctx, conf);
1713 
1714         compat = cfg80211_chandef_compatible(&conf->def, chandef);
1715         if (!compat) {
1716                 ret = -EINVAL;
1717                 goto out;
1718         }
1719 
1720         switch (ctx->replace_state) {
1721         case IEEE80211_CHANCTX_REPLACE_NONE:
1722                 if (!ieee80211_chanctx_reserved_chandef(local, ctx, compat)) {
1723                         ret = -EBUSY;
1724                         goto out;
1725                 }
1726                 break;
1727         case IEEE80211_CHANCTX_WILL_BE_REPLACED:
1728                 /* TODO: Perhaps the bandwidth change could be treated as a
1729                  * reservation itself? */
1730                 ret = -EBUSY;
1731                 goto out;
1732         case IEEE80211_CHANCTX_REPLACES_OTHER:
1733                 /* channel context that is going to replace another channel
1734                  * context doesn't really exist and shouldn't be assigned
1735                  * anywhere yet */
1736                 WARN_ON(1);
1737                 break;
1738         }
1739 
1740         ieee80211_vif_update_chandef(sdata, chandef);
1741 
1742         ieee80211_recalc_chanctx_chantype(local, ctx);
1743 
1744         *changed |= BSS_CHANGED_BANDWIDTH;
1745         ret = 0;
1746  out:
1747         mutex_unlock(&local->chanctx_mtx);
1748         return ret;
1749 }
1750 
1751 void ieee80211_vif_release_channel(struct ieee80211_sub_if_data *sdata)
1752 {
1753         WARN_ON(sdata->dev && netif_carrier_ok(sdata->dev));
1754 
1755         lockdep_assert_held(&sdata->local->mtx);
1756 
1757         mutex_lock(&sdata->local->chanctx_mtx);
1758         __ieee80211_vif_release_channel(sdata);
1759         mutex_unlock(&sdata->local->chanctx_mtx);
1760 }
1761 
1762 void ieee80211_vif_vlan_copy_chanctx(struct ieee80211_sub_if_data *sdata)
1763 {
1764         struct ieee80211_local *local = sdata->local;
1765         struct ieee80211_sub_if_data *ap;
1766         struct ieee80211_chanctx_conf *conf;
1767 
1768         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_AP_VLAN || !sdata->bss))
1769                 return;
1770 
1771         ap = container_of(sdata->bss, struct ieee80211_sub_if_data, u.ap);
1772 
1773         mutex_lock(&local->chanctx_mtx);
1774 
1775         conf = rcu_dereference_protected(ap->vif.chanctx_conf,
1776                                          lockdep_is_held(&local->chanctx_mtx));
1777         rcu_assign_pointer(sdata->vif.chanctx_conf, conf);
1778         mutex_unlock(&local->chanctx_mtx);
1779 }
1780 
1781 void ieee80211_iter_chan_contexts_atomic(
1782         struct ieee80211_hw *hw,
1783         void (*iter)(struct ieee80211_hw *hw,
1784                      struct ieee80211_chanctx_conf *chanctx_conf,
1785                      void *data),
1786         void *iter_data)
1787 {
1788         struct ieee80211_local *local = hw_to_local(hw);
1789         struct ieee80211_chanctx *ctx;
1790 
1791         rcu_read_lock();
1792         list_for_each_entry_rcu(ctx, &local->chanctx_list, list)
1793                 if (ctx->driver_present)
1794                         iter(hw, &ctx->conf, iter_data);
1795         rcu_read_unlock();
1796 }
1797 EXPORT_SYMBOL_GPL(ieee80211_iter_chan_contexts_atomic);
1798 

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