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

Version: ~ [ linux-5.6-rc1 ] ~ [ linux-5.5.2 ] ~ [ linux-5.4.17 ] ~ [ linux-5.3.18 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.102 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.170 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.213 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.213 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.19.8 ] ~ [ linux-3.18.140 ] ~ [ linux-3.17.8 ] ~ [ linux-3.16.81 ] ~ [ linux-3.15.10 ] ~ [ linux-3.14.79 ] ~ [ linux-3.13.11 ] ~ [ linux-3.12.74 ] ~ [ linux-3.11.10 ] ~ [ linux-3.10.108 ] ~ [ linux-3.9.11 ] ~ [ linux-3.8.13 ] ~ [ linux-3.7.10 ] ~ [ linux-3.6.11 ] ~ [ linux-3.5.7 ] ~ [ linux-3.4.113 ] ~ [ linux-3.3.8 ] ~ [ linux-3.2.102 ] ~ [ linux-3.1.10 ] ~ [ linux-3.0.101 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.5 ] ~ [ policy-sample ] ~
Architecture: ~ [ i386 ] ~ [ alpha ] ~ [ m68k ] ~ [ mips ] ~ [ ppc ] ~ [ sparc ] ~ [ sparc64 ] ~

  1 /*
  2  * mac80211 - channel management
  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 
 12 static 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 
 26 static 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 
 40 int 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 
 47 static 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 
 60 static 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 
 66 static struct ieee80211_chanctx *
 67 ieee80211_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 
 80 static const struct cfg80211_chan_def *
 81 ieee80211_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 
103 static const struct cfg80211_chan_def *
104 ieee80211_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 
129 static const struct cfg80211_chan_def *
130 ieee80211_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 
147 static bool
148 ieee80211_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 
164 static struct ieee80211_chanctx *
165 ieee80211_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 
193 static enum 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                  * This applied for both 160 and 80+80. since we use
208                  * the returned value to consider degradation of
209                  * ctx->conf.min_def, we have to make sure to take
210                  * the bigger one (NL80211_CHAN_WIDTH_160).
211                  * Otherwise we might try degrading even when not
212                  * needed, as the max required sta_bw returned (80+80)
213                  * might be smaller than the configured bw (160).
214                  */
215                 return NL80211_CHAN_WIDTH_160;
216         default:
217                 WARN_ON(1);
218                 return NL80211_CHAN_WIDTH_20;
219         }
220 }
221 
222 static enum nl80211_chan_width
223 ieee80211_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 
244 static enum nl80211_chan_width
245 ieee80211_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_P2P_DEVICE:
268                         continue;
269                 case NL80211_IFTYPE_STATION:
270                 case NL80211_IFTYPE_ADHOC:
271                 case NL80211_IFTYPE_WDS:
272                 case NL80211_IFTYPE_MESH_POINT:
273                         width = vif->bss_conf.chandef.width;
274                         break;
275                 case NL80211_IFTYPE_UNSPECIFIED:
276                 case NUM_NL80211_IFTYPES:
277                 case NL80211_IFTYPE_MONITOR:
278                 case NL80211_IFTYPE_P2P_CLIENT:
279                 case NL80211_IFTYPE_P2P_GO:
280                         WARN_ON_ONCE(1);
281                 }
282                 max_bw = max(max_bw, width);
283         }
284 
285         /* use the configured bandwidth in case of monitor interface */
286         sdata = rcu_dereference(local->monitor_sdata);
287         if (sdata && rcu_access_pointer(sdata->vif.chanctx_conf) == conf)
288                 max_bw = max(max_bw, conf->def.width);
289 
290         rcu_read_unlock();
291 
292         return max_bw;
293 }
294 
295 /*
296  * recalc the min required chan width of the channel context, which is
297  * the max of min required widths of all the interfaces bound to this
298  * channel context.
299  */
300 void ieee80211_recalc_chanctx_min_def(struct ieee80211_local *local,
301                                       struct ieee80211_chanctx *ctx)
302 {
303         enum nl80211_chan_width max_bw;
304         struct cfg80211_chan_def min_def;
305 
306         lockdep_assert_held(&local->chanctx_mtx);
307 
308         /* don't optimize 5MHz, 10MHz, and radar_enabled confs */
309         if (ctx->conf.def.width == NL80211_CHAN_WIDTH_5 ||
310             ctx->conf.def.width == NL80211_CHAN_WIDTH_10 ||
311             ctx->conf.radar_enabled) {
312                 ctx->conf.min_def = ctx->conf.def;
313                 return;
314         }
315 
316         max_bw = ieee80211_get_chanctx_max_required_bw(local, &ctx->conf);
317 
318         /* downgrade chandef up to max_bw */
319         min_def = ctx->conf.def;
320         while (min_def.width > max_bw)
321                 ieee80211_chandef_downgrade(&min_def);
322 
323         if (cfg80211_chandef_identical(&ctx->conf.min_def, &min_def))
324                 return;
325 
326         ctx->conf.min_def = min_def;
327         if (!ctx->driver_present)
328                 return;
329 
330         drv_change_chanctx(local, ctx, IEEE80211_CHANCTX_CHANGE_MIN_WIDTH);
331 }
332 
333 static void ieee80211_change_chanctx(struct ieee80211_local *local,
334                                      struct ieee80211_chanctx *ctx,
335                                      const struct cfg80211_chan_def *chandef)
336 {
337         if (cfg80211_chandef_identical(&ctx->conf.def, chandef))
338                 return;
339 
340         WARN_ON(!cfg80211_chandef_compatible(&ctx->conf.def, chandef));
341 
342         ctx->conf.def = *chandef;
343         drv_change_chanctx(local, ctx, IEEE80211_CHANCTX_CHANGE_WIDTH);
344         ieee80211_recalc_chanctx_min_def(local, ctx);
345 
346         if (!local->use_chanctx) {
347                 local->_oper_chandef = *chandef;
348                 ieee80211_hw_config(local, 0);
349         }
350 }
351 
352 static struct ieee80211_chanctx *
353 ieee80211_find_chanctx(struct ieee80211_local *local,
354                        const struct cfg80211_chan_def *chandef,
355                        enum ieee80211_chanctx_mode mode)
356 {
357         struct ieee80211_chanctx *ctx;
358 
359         lockdep_assert_held(&local->chanctx_mtx);
360 
361         if (mode == IEEE80211_CHANCTX_EXCLUSIVE)
362                 return NULL;
363 
364         list_for_each_entry(ctx, &local->chanctx_list, list) {
365                 const struct cfg80211_chan_def *compat;
366 
367                 if (ctx->replace_state != IEEE80211_CHANCTX_REPLACE_NONE)
368                         continue;
369 
370                 if (ctx->mode == IEEE80211_CHANCTX_EXCLUSIVE)
371                         continue;
372 
373                 compat = cfg80211_chandef_compatible(&ctx->conf.def, chandef);
374                 if (!compat)
375                         continue;
376 
377                 compat = ieee80211_chanctx_reserved_chandef(local, ctx,
378                                                             compat);
379                 if (!compat)
380                         continue;
381 
382                 ieee80211_change_chanctx(local, ctx, compat);
383 
384                 return ctx;
385         }
386 
387         return NULL;
388 }
389 
390 static bool ieee80211_is_radar_required(struct ieee80211_local *local)
391 {
392         struct ieee80211_sub_if_data *sdata;
393 
394         lockdep_assert_held(&local->mtx);
395 
396         rcu_read_lock();
397         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
398                 if (sdata->radar_required) {
399                         rcu_read_unlock();
400                         return true;
401                 }
402         }
403         rcu_read_unlock();
404 
405         return false;
406 }
407 
408 static struct ieee80211_chanctx *
409 ieee80211_alloc_chanctx(struct ieee80211_local *local,
410                         const struct cfg80211_chan_def *chandef,
411                         enum ieee80211_chanctx_mode mode)
412 {
413         struct ieee80211_chanctx *ctx;
414 
415         lockdep_assert_held(&local->chanctx_mtx);
416 
417         ctx = kzalloc(sizeof(*ctx) + local->hw.chanctx_data_size, GFP_KERNEL);
418         if (!ctx)
419                 return NULL;
420 
421         INIT_LIST_HEAD(&ctx->assigned_vifs);
422         INIT_LIST_HEAD(&ctx->reserved_vifs);
423         ctx->conf.def = *chandef;
424         ctx->conf.rx_chains_static = 1;
425         ctx->conf.rx_chains_dynamic = 1;
426         ctx->mode = mode;
427         ctx->conf.radar_enabled = ieee80211_is_radar_required(local);
428         ieee80211_recalc_chanctx_min_def(local, ctx);
429 
430         return ctx;
431 }
432 
433 static int ieee80211_add_chanctx(struct ieee80211_local *local,
434                                  struct ieee80211_chanctx *ctx)
435 {
436         u32 changed;
437         int err;
438 
439         lockdep_assert_held(&local->mtx);
440         lockdep_assert_held(&local->chanctx_mtx);
441 
442         if (!local->use_chanctx)
443                 local->hw.conf.radar_enabled = ctx->conf.radar_enabled;
444 
445         /* turn idle off *before* setting channel -- some drivers need that */
446         changed = ieee80211_idle_off(local);
447         if (changed)
448                 ieee80211_hw_config(local, changed);
449 
450         if (!local->use_chanctx) {
451                 local->_oper_chandef = ctx->conf.def;
452                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL);
453         } else {
454                 err = drv_add_chanctx(local, ctx);
455                 if (err) {
456                         ieee80211_recalc_idle(local);
457                         return err;
458                 }
459         }
460 
461         return 0;
462 }
463 
464 static struct ieee80211_chanctx *
465 ieee80211_new_chanctx(struct ieee80211_local *local,
466                       const struct cfg80211_chan_def *chandef,
467                       enum ieee80211_chanctx_mode mode)
468 {
469         struct ieee80211_chanctx *ctx;
470         int err;
471 
472         lockdep_assert_held(&local->mtx);
473         lockdep_assert_held(&local->chanctx_mtx);
474 
475         ctx = ieee80211_alloc_chanctx(local, chandef, mode);
476         if (!ctx)
477                 return ERR_PTR(-ENOMEM);
478 
479         err = ieee80211_add_chanctx(local, ctx);
480         if (err) {
481                 kfree(ctx);
482                 return ERR_PTR(err);
483         }
484 
485         list_add_rcu(&ctx->list, &local->chanctx_list);
486         return ctx;
487 }
488 
489 static void ieee80211_del_chanctx(struct ieee80211_local *local,
490                                   struct ieee80211_chanctx *ctx)
491 {
492         lockdep_assert_held(&local->chanctx_mtx);
493 
494         if (!local->use_chanctx) {
495                 struct cfg80211_chan_def *chandef = &local->_oper_chandef;
496                 chandef->width = NL80211_CHAN_WIDTH_20_NOHT;
497                 chandef->center_freq1 = chandef->chan->center_freq;
498                 chandef->center_freq2 = 0;
499 
500                 /* NOTE: Disabling radar is only valid here for
501                  * single channel context. To be sure, check it ...
502                  */
503                 WARN_ON(local->hw.conf.radar_enabled &&
504                         !list_empty(&local->chanctx_list));
505 
506                 local->hw.conf.radar_enabled = false;
507 
508                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL);
509         } else {
510                 drv_remove_chanctx(local, ctx);
511         }
512 
513         ieee80211_recalc_idle(local);
514 }
515 
516 static void ieee80211_free_chanctx(struct ieee80211_local *local,
517                                    struct ieee80211_chanctx *ctx)
518 {
519         lockdep_assert_held(&local->chanctx_mtx);
520 
521         WARN_ON_ONCE(ieee80211_chanctx_refcount(local, ctx) != 0);
522 
523         list_del_rcu(&ctx->list);
524         ieee80211_del_chanctx(local, ctx);
525         kfree_rcu(ctx, rcu_head);
526 }
527 
528 static void ieee80211_recalc_chanctx_chantype(struct ieee80211_local *local,
529                                               struct ieee80211_chanctx *ctx)
530 {
531         struct ieee80211_chanctx_conf *conf = &ctx->conf;
532         struct ieee80211_sub_if_data *sdata;
533         const struct cfg80211_chan_def *compat = NULL;
534 
535         lockdep_assert_held(&local->chanctx_mtx);
536 
537         rcu_read_lock();
538         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
539 
540                 if (!ieee80211_sdata_running(sdata))
541                         continue;
542                 if (rcu_access_pointer(sdata->vif.chanctx_conf) != conf)
543                         continue;
544                 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
545                         continue;
546 
547                 if (!compat)
548                         compat = &sdata->vif.bss_conf.chandef;
549 
550                 compat = cfg80211_chandef_compatible(
551                                 &sdata->vif.bss_conf.chandef, compat);
552                 if (!compat)
553                         break;
554         }
555         rcu_read_unlock();
556 
557         if (WARN_ON_ONCE(!compat))
558                 return;
559 
560         ieee80211_change_chanctx(local, ctx, compat);
561 }
562 
563 static void ieee80211_recalc_radar_chanctx(struct ieee80211_local *local,
564                                            struct ieee80211_chanctx *chanctx)
565 {
566         bool radar_enabled;
567 
568         lockdep_assert_held(&local->chanctx_mtx);
569         /* for setting local->radar_detect_enabled */
570         lockdep_assert_held(&local->mtx);
571 
572         radar_enabled = ieee80211_is_radar_required(local);
573 
574         if (radar_enabled == chanctx->conf.radar_enabled)
575                 return;
576 
577         chanctx->conf.radar_enabled = radar_enabled;
578         local->radar_detect_enabled = chanctx->conf.radar_enabled;
579 
580         if (!local->use_chanctx) {
581                 local->hw.conf.radar_enabled = chanctx->conf.radar_enabled;
582                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL);
583         }
584 
585         drv_change_chanctx(local, chanctx, IEEE80211_CHANCTX_CHANGE_RADAR);
586 }
587 
588 static int ieee80211_assign_vif_chanctx(struct ieee80211_sub_if_data *sdata,
589                                         struct ieee80211_chanctx *new_ctx)
590 {
591         struct ieee80211_local *local = sdata->local;
592         struct ieee80211_chanctx_conf *conf;
593         struct ieee80211_chanctx *curr_ctx = NULL;
594         int ret = 0;
595 
596         conf = rcu_dereference_protected(sdata->vif.chanctx_conf,
597                                          lockdep_is_held(&local->chanctx_mtx));
598 
599         if (conf) {
600                 curr_ctx = container_of(conf, struct ieee80211_chanctx, conf);
601 
602                 drv_unassign_vif_chanctx(local, sdata, curr_ctx);
603                 conf = NULL;
604                 list_del(&sdata->assigned_chanctx_list);
605         }
606 
607         if (new_ctx) {
608                 ret = drv_assign_vif_chanctx(local, sdata, new_ctx);
609                 if (ret)
610                         goto out;
611 
612                 conf = &new_ctx->conf;
613                 list_add(&sdata->assigned_chanctx_list,
614                          &new_ctx->assigned_vifs);
615         }
616 
617 out:
618         rcu_assign_pointer(sdata->vif.chanctx_conf, conf);
619 
620         sdata->vif.bss_conf.idle = !conf;
621 
622         if (curr_ctx && ieee80211_chanctx_num_assigned(local, curr_ctx) > 0) {
623                 ieee80211_recalc_chanctx_chantype(local, curr_ctx);
624                 ieee80211_recalc_smps_chanctx(local, curr_ctx);
625                 ieee80211_recalc_radar_chanctx(local, curr_ctx);
626                 ieee80211_recalc_chanctx_min_def(local, curr_ctx);
627         }
628 
629         if (new_ctx && ieee80211_chanctx_num_assigned(local, new_ctx) > 0) {
630                 ieee80211_recalc_txpower(sdata);
631                 ieee80211_recalc_chanctx_min_def(local, new_ctx);
632         }
633 
634         if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE &&
635             sdata->vif.type != NL80211_IFTYPE_MONITOR)
636                 ieee80211_bss_info_change_notify(sdata,
637                                                  BSS_CHANGED_IDLE);
638 
639         return ret;
640 }
641 
642 static void __ieee80211_vif_release_channel(struct ieee80211_sub_if_data *sdata)
643 {
644         struct ieee80211_local *local = sdata->local;
645         struct ieee80211_chanctx_conf *conf;
646         struct ieee80211_chanctx *ctx;
647         bool use_reserved_switch = false;
648 
649         lockdep_assert_held(&local->chanctx_mtx);
650 
651         conf = rcu_dereference_protected(sdata->vif.chanctx_conf,
652                                          lockdep_is_held(&local->chanctx_mtx));
653         if (!conf)
654                 return;
655 
656         ctx = container_of(conf, struct ieee80211_chanctx, conf);
657 
658         if (sdata->reserved_chanctx) {
659                 if (sdata->reserved_chanctx->replace_state ==
660                     IEEE80211_CHANCTX_REPLACES_OTHER &&
661                     ieee80211_chanctx_num_reserved(local,
662                                                    sdata->reserved_chanctx) > 1)
663                         use_reserved_switch = true;
664 
665                 ieee80211_vif_unreserve_chanctx(sdata);
666         }
667 
668         ieee80211_assign_vif_chanctx(sdata, NULL);
669         if (ieee80211_chanctx_refcount(local, ctx) == 0)
670                 ieee80211_free_chanctx(local, ctx);
671 
672         /* Unreserving may ready an in-place reservation. */
673         if (use_reserved_switch)
674                 ieee80211_vif_use_reserved_switch(local);
675 }
676 
677 void ieee80211_recalc_smps_chanctx(struct ieee80211_local *local,
678                                    struct ieee80211_chanctx *chanctx)
679 {
680         struct ieee80211_sub_if_data *sdata;
681         u8 rx_chains_static, rx_chains_dynamic;
682 
683         lockdep_assert_held(&local->chanctx_mtx);
684 
685         rx_chains_static = 1;
686         rx_chains_dynamic = 1;
687 
688         rcu_read_lock();
689         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
690                 u8 needed_static, needed_dynamic;
691 
692                 if (!ieee80211_sdata_running(sdata))
693                         continue;
694 
695                 if (rcu_access_pointer(sdata->vif.chanctx_conf) !=
696                                                 &chanctx->conf)
697                         continue;
698 
699                 switch (sdata->vif.type) {
700                 case NL80211_IFTYPE_P2P_DEVICE:
701                         continue;
702                 case NL80211_IFTYPE_STATION:
703                         if (!sdata->u.mgd.associated)
704                                 continue;
705                         break;
706                 case NL80211_IFTYPE_AP_VLAN:
707                         continue;
708                 case NL80211_IFTYPE_AP:
709                 case NL80211_IFTYPE_ADHOC:
710                 case NL80211_IFTYPE_WDS:
711                 case NL80211_IFTYPE_MESH_POINT:
712                         break;
713                 default:
714                         WARN_ON_ONCE(1);
715                 }
716 
717                 switch (sdata->smps_mode) {
718                 default:
719                         WARN_ONCE(1, "Invalid SMPS mode %d\n",
720                                   sdata->smps_mode);
721                         /* fall through */
722                 case IEEE80211_SMPS_OFF:
723                         needed_static = sdata->needed_rx_chains;
724                         needed_dynamic = sdata->needed_rx_chains;
725                         break;
726                 case IEEE80211_SMPS_DYNAMIC:
727                         needed_static = 1;
728                         needed_dynamic = sdata->needed_rx_chains;
729                         break;
730                 case IEEE80211_SMPS_STATIC:
731                         needed_static = 1;
732                         needed_dynamic = 1;
733                         break;
734                 }
735 
736                 rx_chains_static = max(rx_chains_static, needed_static);
737                 rx_chains_dynamic = max(rx_chains_dynamic, needed_dynamic);
738         }
739 
740         /* Disable SMPS for the monitor interface */
741         sdata = rcu_dereference(local->monitor_sdata);
742         if (sdata &&
743             rcu_access_pointer(sdata->vif.chanctx_conf) == &chanctx->conf)
744                 rx_chains_dynamic = rx_chains_static = local->rx_chains;
745 
746         rcu_read_unlock();
747 
748         if (!local->use_chanctx) {
749                 if (rx_chains_static > 1)
750                         local->smps_mode = IEEE80211_SMPS_OFF;
751                 else if (rx_chains_dynamic > 1)
752                         local->smps_mode = IEEE80211_SMPS_DYNAMIC;
753                 else
754                         local->smps_mode = IEEE80211_SMPS_STATIC;
755                 ieee80211_hw_config(local, 0);
756         }
757 
758         if (rx_chains_static == chanctx->conf.rx_chains_static &&
759             rx_chains_dynamic == chanctx->conf.rx_chains_dynamic)
760                 return;
761 
762         chanctx->conf.rx_chains_static = rx_chains_static;
763         chanctx->conf.rx_chains_dynamic = rx_chains_dynamic;
764         drv_change_chanctx(local, chanctx, IEEE80211_CHANCTX_CHANGE_RX_CHAINS);
765 }
766 
767 int ieee80211_vif_use_channel(struct ieee80211_sub_if_data *sdata,
768                               const struct cfg80211_chan_def *chandef,
769                               enum ieee80211_chanctx_mode mode)
770 {
771         struct ieee80211_local *local = sdata->local;
772         struct ieee80211_chanctx *ctx;
773         u8 radar_detect_width = 0;
774         int ret;
775 
776         lockdep_assert_held(&local->mtx);
777 
778         WARN_ON(sdata->dev && netif_carrier_ok(sdata->dev));
779 
780         mutex_lock(&local->chanctx_mtx);
781 
782         ret = cfg80211_chandef_dfs_required(local->hw.wiphy,
783                                             chandef,
784                                             sdata->wdev.iftype);
785         if (ret < 0)
786                 goto out;
787         if (ret > 0)
788                 radar_detect_width = BIT(chandef->width);
789 
790         sdata->radar_required = ret;
791 
792         ret = ieee80211_check_combinations(sdata, chandef, mode,
793                                            radar_detect_width);
794         if (ret < 0)
795                 goto out;
796 
797         __ieee80211_vif_release_channel(sdata);
798 
799         ctx = ieee80211_find_chanctx(local, chandef, mode);
800         if (!ctx)
801                 ctx = ieee80211_new_chanctx(local, chandef, mode);
802         if (IS_ERR(ctx)) {
803                 ret = PTR_ERR(ctx);
804                 goto out;
805         }
806 
807         sdata->vif.bss_conf.chandef = *chandef;
808 
809         ret = ieee80211_assign_vif_chanctx(sdata, ctx);
810         if (ret) {
811                 /* if assign fails refcount stays the same */
812                 if (ieee80211_chanctx_refcount(local, ctx) == 0)
813                         ieee80211_free_chanctx(local, ctx);
814                 goto out;
815         }
816 
817         ieee80211_recalc_smps_chanctx(local, ctx);
818         ieee80211_recalc_radar_chanctx(local, ctx);
819  out:
820         mutex_unlock(&local->chanctx_mtx);
821         return ret;
822 }
823 
824 static void
825 __ieee80211_vif_copy_chanctx_to_vlans(struct ieee80211_sub_if_data *sdata,
826                                       bool clear)
827 {
828         struct ieee80211_local *local __maybe_unused = sdata->local;
829         struct ieee80211_sub_if_data *vlan;
830         struct ieee80211_chanctx_conf *conf;
831 
832         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_AP))
833                 return;
834 
835         lockdep_assert_held(&local->mtx);
836 
837         /* Check that conf exists, even when clearing this function
838          * must be called with the AP's channel context still there
839          * as it would otherwise cause VLANs to have an invalid
840          * channel context pointer for a while, possibly pointing
841          * to a channel context that has already been freed.
842          */
843         conf = rcu_dereference_protected(sdata->vif.chanctx_conf,
844                                          lockdep_is_held(&local->chanctx_mtx));
845         WARN_ON(!conf);
846 
847         if (clear)
848                 conf = NULL;
849 
850         list_for_each_entry(vlan, &sdata->u.ap.vlans, u.vlan.list)
851                 rcu_assign_pointer(vlan->vif.chanctx_conf, conf);
852 }
853 
854 void ieee80211_vif_copy_chanctx_to_vlans(struct ieee80211_sub_if_data *sdata,
855                                          bool clear)
856 {
857         struct ieee80211_local *local = sdata->local;
858 
859         mutex_lock(&local->chanctx_mtx);
860 
861         __ieee80211_vif_copy_chanctx_to_vlans(sdata, clear);
862 
863         mutex_unlock(&local->chanctx_mtx);
864 }
865 
866 int ieee80211_vif_unreserve_chanctx(struct ieee80211_sub_if_data *sdata)
867 {
868         struct ieee80211_chanctx *ctx = sdata->reserved_chanctx;
869 
870         lockdep_assert_held(&sdata->local->chanctx_mtx);
871 
872         if (WARN_ON(!ctx))
873                 return -EINVAL;
874 
875         list_del(&sdata->reserved_chanctx_list);
876         sdata->reserved_chanctx = NULL;
877 
878         if (ieee80211_chanctx_refcount(sdata->local, ctx) == 0) {
879                 if (ctx->replace_state == IEEE80211_CHANCTX_REPLACES_OTHER) {
880                         if (WARN_ON(!ctx->replace_ctx))
881                                 return -EINVAL;
882 
883                         WARN_ON(ctx->replace_ctx->replace_state !=
884                                 IEEE80211_CHANCTX_WILL_BE_REPLACED);
885                         WARN_ON(ctx->replace_ctx->replace_ctx != ctx);
886 
887                         ctx->replace_ctx->replace_ctx = NULL;
888                         ctx->replace_ctx->replace_state =
889                                         IEEE80211_CHANCTX_REPLACE_NONE;
890 
891                         list_del_rcu(&ctx->list);
892                         kfree_rcu(ctx, rcu_head);
893                 } else {
894                         ieee80211_free_chanctx(sdata->local, ctx);
895                 }
896         }
897 
898         return 0;
899 }
900 
901 int ieee80211_vif_reserve_chanctx(struct ieee80211_sub_if_data *sdata,
902                                   const struct cfg80211_chan_def *chandef,
903                                   enum ieee80211_chanctx_mode mode,
904                                   bool radar_required)
905 {
906         struct ieee80211_local *local = sdata->local;
907         struct ieee80211_chanctx *new_ctx, *curr_ctx, *ctx;
908 
909         lockdep_assert_held(&local->chanctx_mtx);
910 
911         curr_ctx = ieee80211_vif_get_chanctx(sdata);
912         if (curr_ctx && local->use_chanctx && !local->ops->switch_vif_chanctx)
913                 return -ENOTSUPP;
914 
915         new_ctx = ieee80211_find_reservation_chanctx(local, chandef, mode);
916         if (!new_ctx) {
917                 if (ieee80211_can_create_new_chanctx(local)) {
918                         new_ctx = ieee80211_new_chanctx(local, chandef, mode);
919                         if (IS_ERR(new_ctx))
920                                 return PTR_ERR(new_ctx);
921                 } else {
922                         if (!curr_ctx ||
923                             (curr_ctx->replace_state ==
924                              IEEE80211_CHANCTX_WILL_BE_REPLACED) ||
925                             !list_empty(&curr_ctx->reserved_vifs)) {
926                                 /*
927                                  * Another vif already requested this context
928                                  * for a reservation. Find another one hoping
929                                  * all vifs assigned to it will also switch
930                                  * soon enough.
931                                  *
932                                  * TODO: This needs a little more work as some
933                                  * cases (more than 2 chanctx capable devices)
934                                  * may fail which could otherwise succeed
935                                  * provided some channel context juggling was
936                                  * performed.
937                                  *
938                                  * Consider ctx1..3, vif1..6, each ctx has 2
939                                  * vifs. vif1 and vif2 from ctx1 request new
940                                  * different chandefs starting 2 in-place
941                                  * reserations with ctx4 and ctx5 replacing
942                                  * ctx1 and ctx2 respectively. Next vif5 and
943                                  * vif6 from ctx3 reserve ctx4. If vif3 and
944                                  * vif4 remain on ctx2 as they are then this
945                                  * fails unless `replace_ctx` from ctx5 is
946                                  * replaced with ctx3.
947                                  */
948                                 list_for_each_entry(ctx, &local->chanctx_list,
949                                                     list) {
950                                         if (ctx->replace_state !=
951                                             IEEE80211_CHANCTX_REPLACE_NONE)
952                                                 continue;
953 
954                                         if (!list_empty(&ctx->reserved_vifs))
955                                                 continue;
956 
957                                         curr_ctx = ctx;
958                                         break;
959                                 }
960                         }
961 
962                         /*
963                          * If that's true then all available contexts already
964                          * have reservations and cannot be used.
965                          */
966                         if (!curr_ctx ||
967                             (curr_ctx->replace_state ==
968                              IEEE80211_CHANCTX_WILL_BE_REPLACED) ||
969                             !list_empty(&curr_ctx->reserved_vifs))
970                                 return -EBUSY;
971 
972                         new_ctx = ieee80211_alloc_chanctx(local, chandef, mode);
973                         if (!new_ctx)
974                                 return -ENOMEM;
975 
976                         new_ctx->replace_ctx = curr_ctx;
977                         new_ctx->replace_state =
978                                         IEEE80211_CHANCTX_REPLACES_OTHER;
979 
980                         curr_ctx->replace_ctx = new_ctx;
981                         curr_ctx->replace_state =
982                                         IEEE80211_CHANCTX_WILL_BE_REPLACED;
983 
984                         list_add_rcu(&new_ctx->list, &local->chanctx_list);
985                 }
986         }
987 
988         list_add(&sdata->reserved_chanctx_list, &new_ctx->reserved_vifs);
989         sdata->reserved_chanctx = new_ctx;
990         sdata->reserved_chandef = *chandef;
991         sdata->reserved_radar_required = radar_required;
992         sdata->reserved_ready = false;
993 
994         return 0;
995 }
996 
997 static void
998 ieee80211_vif_chanctx_reservation_complete(struct ieee80211_sub_if_data *sdata)
999 {
1000         switch (sdata->vif.type) {
1001         case NL80211_IFTYPE_ADHOC:
1002         case NL80211_IFTYPE_AP:
1003         case NL80211_IFTYPE_MESH_POINT:
1004                 ieee80211_queue_work(&sdata->local->hw,
1005                                      &sdata->csa_finalize_work);
1006                 break;
1007         case NL80211_IFTYPE_STATION:
1008                 ieee80211_queue_work(&sdata->local->hw,
1009                                      &sdata->u.mgd.chswitch_work);
1010                 break;
1011         case NL80211_IFTYPE_UNSPECIFIED:
1012         case NL80211_IFTYPE_AP_VLAN:
1013         case NL80211_IFTYPE_WDS:
1014         case NL80211_IFTYPE_MONITOR:
1015         case NL80211_IFTYPE_P2P_CLIENT:
1016         case NL80211_IFTYPE_P2P_GO:
1017         case NL80211_IFTYPE_P2P_DEVICE:
1018         case NUM_NL80211_IFTYPES:
1019                 WARN_ON(1);
1020                 break;
1021         }
1022 }
1023 
1024 static int
1025 ieee80211_vif_use_reserved_reassign(struct ieee80211_sub_if_data *sdata)
1026 {
1027         struct ieee80211_local *local = sdata->local;
1028         struct ieee80211_vif_chanctx_switch vif_chsw[1] = {};
1029         struct ieee80211_chanctx *old_ctx, *new_ctx;
1030         const struct cfg80211_chan_def *chandef;
1031         u32 changed = 0;
1032         int err;
1033 
1034         lockdep_assert_held(&local->mtx);
1035         lockdep_assert_held(&local->chanctx_mtx);
1036 
1037         new_ctx = sdata->reserved_chanctx;
1038         old_ctx = ieee80211_vif_get_chanctx(sdata);
1039 
1040         if (WARN_ON(!sdata->reserved_ready))
1041                 return -EBUSY;
1042 
1043         if (WARN_ON(!new_ctx))
1044                 return -EINVAL;
1045 
1046         if (WARN_ON(!old_ctx))
1047                 return -EINVAL;
1048 
1049         if (WARN_ON(new_ctx->replace_state ==
1050                     IEEE80211_CHANCTX_REPLACES_OTHER))
1051                 return -EINVAL;
1052 
1053         chandef = ieee80211_chanctx_non_reserved_chandef(local, new_ctx,
1054                                 &sdata->reserved_chandef);
1055         if (WARN_ON(!chandef))
1056                 return -EINVAL;
1057 
1058         vif_chsw[0].vif = &sdata->vif;
1059         vif_chsw[0].old_ctx = &old_ctx->conf;
1060         vif_chsw[0].new_ctx = &new_ctx->conf;
1061 
1062         list_del(&sdata->reserved_chanctx_list);
1063         sdata->reserved_chanctx = NULL;
1064 
1065         err = drv_switch_vif_chanctx(local, vif_chsw, 1,
1066                                      CHANCTX_SWMODE_REASSIGN_VIF);
1067         if (err) {
1068                 if (ieee80211_chanctx_refcount(local, new_ctx) == 0)
1069                         ieee80211_free_chanctx(local, new_ctx);
1070 
1071                 goto out;
1072         }
1073 
1074         list_move(&sdata->assigned_chanctx_list, &new_ctx->assigned_vifs);
1075         rcu_assign_pointer(sdata->vif.chanctx_conf, &new_ctx->conf);
1076 
1077         if (sdata->vif.type == NL80211_IFTYPE_AP)
1078                 __ieee80211_vif_copy_chanctx_to_vlans(sdata, false);
1079 
1080         if (ieee80211_chanctx_refcount(local, old_ctx) == 0)
1081                 ieee80211_free_chanctx(local, old_ctx);
1082 
1083         if (sdata->vif.bss_conf.chandef.width != sdata->reserved_chandef.width)
1084                 changed = BSS_CHANGED_BANDWIDTH;
1085 
1086         sdata->vif.bss_conf.chandef = sdata->reserved_chandef;
1087 
1088         if (changed)
1089                 ieee80211_bss_info_change_notify(sdata, changed);
1090 
1091 out:
1092         ieee80211_vif_chanctx_reservation_complete(sdata);
1093         return err;
1094 }
1095 
1096 static int
1097 ieee80211_vif_use_reserved_assign(struct ieee80211_sub_if_data *sdata)
1098 {
1099         struct ieee80211_local *local = sdata->local;
1100         struct ieee80211_chanctx *old_ctx, *new_ctx;
1101         const struct cfg80211_chan_def *chandef;
1102         int err;
1103 
1104         old_ctx = ieee80211_vif_get_chanctx(sdata);
1105         new_ctx = sdata->reserved_chanctx;
1106 
1107         if (WARN_ON(!sdata->reserved_ready))
1108                 return -EINVAL;
1109 
1110         if (WARN_ON(old_ctx))
1111                 return -EINVAL;
1112 
1113         if (WARN_ON(!new_ctx))
1114                 return -EINVAL;
1115 
1116         if (WARN_ON(new_ctx->replace_state ==
1117                     IEEE80211_CHANCTX_REPLACES_OTHER))
1118                 return -EINVAL;
1119 
1120         chandef = ieee80211_chanctx_non_reserved_chandef(local, new_ctx,
1121                                 &sdata->reserved_chandef);
1122         if (WARN_ON(!chandef))
1123                 return -EINVAL;
1124 
1125         list_del(&sdata->reserved_chanctx_list);
1126         sdata->reserved_chanctx = NULL;
1127 
1128         err = ieee80211_assign_vif_chanctx(sdata, new_ctx);
1129         if (err) {
1130                 if (ieee80211_chanctx_refcount(local, new_ctx) == 0)
1131                         ieee80211_free_chanctx(local, new_ctx);
1132 
1133                 goto out;
1134         }
1135 
1136 out:
1137         ieee80211_vif_chanctx_reservation_complete(sdata);
1138         return err;
1139 }
1140 
1141 static bool
1142 ieee80211_vif_has_in_place_reservation(struct ieee80211_sub_if_data *sdata)
1143 {
1144         struct ieee80211_chanctx *old_ctx, *new_ctx;
1145 
1146         lockdep_assert_held(&sdata->local->chanctx_mtx);
1147 
1148         new_ctx = sdata->reserved_chanctx;
1149         old_ctx = ieee80211_vif_get_chanctx(sdata);
1150 
1151         if (!old_ctx)
1152                 return false;
1153 
1154         if (WARN_ON(!new_ctx))
1155                 return false;
1156 
1157         if (old_ctx->replace_state != IEEE80211_CHANCTX_WILL_BE_REPLACED)
1158                 return false;
1159 
1160         if (new_ctx->replace_state != IEEE80211_CHANCTX_REPLACES_OTHER)
1161                 return false;
1162 
1163         return true;
1164 }
1165 
1166 static int ieee80211_chsw_switch_hwconf(struct ieee80211_local *local,
1167                                         struct ieee80211_chanctx *new_ctx)
1168 {
1169         const struct cfg80211_chan_def *chandef;
1170 
1171         lockdep_assert_held(&local->mtx);
1172         lockdep_assert_held(&local->chanctx_mtx);
1173 
1174         chandef = ieee80211_chanctx_reserved_chandef(local, new_ctx, NULL);
1175         if (WARN_ON(!chandef))
1176                 return -EINVAL;
1177 
1178         local->hw.conf.radar_enabled = new_ctx->conf.radar_enabled;
1179         local->_oper_chandef = *chandef;
1180         ieee80211_hw_config(local, 0);
1181 
1182         return 0;
1183 }
1184 
1185 static int ieee80211_chsw_switch_vifs(struct ieee80211_local *local,
1186                                       int n_vifs)
1187 {
1188         struct ieee80211_vif_chanctx_switch *vif_chsw;
1189         struct ieee80211_sub_if_data *sdata;
1190         struct ieee80211_chanctx *ctx, *old_ctx;
1191         int i, err;
1192 
1193         lockdep_assert_held(&local->mtx);
1194         lockdep_assert_held(&local->chanctx_mtx);
1195 
1196         vif_chsw = kzalloc(sizeof(vif_chsw[0]) * n_vifs, GFP_KERNEL);
1197         if (!vif_chsw)
1198                 return -ENOMEM;
1199 
1200         i = 0;
1201         list_for_each_entry(ctx, &local->chanctx_list, list) {
1202                 if (ctx->replace_state != IEEE80211_CHANCTX_REPLACES_OTHER)
1203                         continue;
1204 
1205                 if (WARN_ON(!ctx->replace_ctx)) {
1206                         err = -EINVAL;
1207                         goto out;
1208                 }
1209 
1210                 list_for_each_entry(sdata, &ctx->reserved_vifs,
1211                                     reserved_chanctx_list) {
1212                         if (!ieee80211_vif_has_in_place_reservation(
1213                                         sdata))
1214                                 continue;
1215 
1216                         old_ctx = ieee80211_vif_get_chanctx(sdata);
1217                         vif_chsw[i].vif = &sdata->vif;
1218                         vif_chsw[i].old_ctx = &old_ctx->conf;
1219                         vif_chsw[i].new_ctx = &ctx->conf;
1220 
1221                         i++;
1222                 }
1223         }
1224 
1225         err = drv_switch_vif_chanctx(local, vif_chsw, n_vifs,
1226                                      CHANCTX_SWMODE_SWAP_CONTEXTS);
1227 
1228 out:
1229         kfree(vif_chsw);
1230         return err;
1231 }
1232 
1233 static int ieee80211_chsw_switch_ctxs(struct ieee80211_local *local)
1234 {
1235         struct ieee80211_chanctx *ctx;
1236         int err;
1237 
1238         lockdep_assert_held(&local->mtx);
1239         lockdep_assert_held(&local->chanctx_mtx);
1240 
1241         list_for_each_entry(ctx, &local->chanctx_list, list) {
1242                 if (ctx->replace_state != IEEE80211_CHANCTX_REPLACES_OTHER)
1243                         continue;
1244 
1245                 if (!list_empty(&ctx->replace_ctx->assigned_vifs))
1246                         continue;
1247 
1248                 ieee80211_del_chanctx(local, ctx->replace_ctx);
1249                 err = ieee80211_add_chanctx(local, ctx);
1250                 if (err)
1251                         goto err;
1252         }
1253 
1254         return 0;
1255 
1256 err:
1257         WARN_ON(ieee80211_add_chanctx(local, ctx));
1258         list_for_each_entry_continue_reverse(ctx, &local->chanctx_list, list) {
1259                 if (ctx->replace_state != IEEE80211_CHANCTX_REPLACES_OTHER)
1260                         continue;
1261 
1262                 if (!list_empty(&ctx->replace_ctx->assigned_vifs))
1263                         continue;
1264 
1265                 ieee80211_del_chanctx(local, ctx);
1266                 WARN_ON(ieee80211_add_chanctx(local, ctx->replace_ctx));
1267         }
1268 
1269         return err;
1270 }
1271 
1272 int
1273 ieee80211_vif_use_reserved_switch(struct ieee80211_local *local)
1274 {
1275         struct ieee80211_sub_if_data *sdata, *sdata_tmp;
1276         struct ieee80211_chanctx *ctx, *ctx_tmp, *old_ctx;
1277         struct ieee80211_chanctx *new_ctx = NULL;
1278         int i, err, n_assigned, n_reserved, n_ready;
1279         int n_ctx = 0, n_vifs_switch = 0, n_vifs_assign = 0, n_vifs_ctxless = 0;
1280 
1281         lockdep_assert_held(&local->mtx);
1282         lockdep_assert_held(&local->chanctx_mtx);
1283 
1284         /*
1285          * If there are 2 independent pairs of channel contexts performing
1286          * cross-switch of their vifs this code will still wait until both are
1287          * ready even though it could be possible to switch one before the
1288          * other is ready.
1289          *
1290          * For practical reasons and code simplicity just do a single huge
1291          * switch.
1292          */
1293 
1294         /*
1295          * Verify if the reservation is still feasible.
1296          *  - if it's not then disconnect
1297          *  - if it is but not all vifs necessary are ready then defer
1298          */
1299 
1300         list_for_each_entry(ctx, &local->chanctx_list, list) {
1301                 if (ctx->replace_state != IEEE80211_CHANCTX_REPLACES_OTHER)
1302                         continue;
1303 
1304                 if (WARN_ON(!ctx->replace_ctx)) {
1305                         err = -EINVAL;
1306                         goto err;
1307                 }
1308 
1309                 if (!local->use_chanctx)
1310                         new_ctx = ctx;
1311 
1312                 n_ctx++;
1313 
1314                 n_assigned = 0;
1315                 n_reserved = 0;
1316                 n_ready = 0;
1317 
1318                 list_for_each_entry(sdata, &ctx->replace_ctx->assigned_vifs,
1319                                     assigned_chanctx_list) {
1320                         n_assigned++;
1321                         if (sdata->reserved_chanctx) {
1322                                 n_reserved++;
1323                                 if (sdata->reserved_ready)
1324                                         n_ready++;
1325                         }
1326                 }
1327 
1328                 if (n_assigned != n_reserved) {
1329                         if (n_ready == n_reserved) {
1330                                 wiphy_info(local->hw.wiphy,
1331                                            "channel context reservation cannot be finalized because some interfaces aren't switching\n");
1332                                 err = -EBUSY;
1333                                 goto err;
1334                         }
1335 
1336                         return -EAGAIN;
1337                 }
1338 
1339                 ctx->conf.radar_enabled = false;
1340                 list_for_each_entry(sdata, &ctx->reserved_vifs,
1341                                     reserved_chanctx_list) {
1342                         if (ieee80211_vif_has_in_place_reservation(sdata) &&
1343                             !sdata->reserved_ready)
1344                                 return -EAGAIN;
1345 
1346                         old_ctx = ieee80211_vif_get_chanctx(sdata);
1347                         if (old_ctx) {
1348                                 if (old_ctx->replace_state ==
1349                                     IEEE80211_CHANCTX_WILL_BE_REPLACED)
1350                                         n_vifs_switch++;
1351                                 else
1352                                         n_vifs_assign++;
1353                         } else {
1354                                 n_vifs_ctxless++;
1355                         }
1356 
1357                         if (sdata->reserved_radar_required)
1358                                 ctx->conf.radar_enabled = true;
1359                 }
1360         }
1361 
1362         if (WARN_ON(n_ctx == 0) ||
1363             WARN_ON(n_vifs_switch == 0 &&
1364                     n_vifs_assign == 0 &&
1365                     n_vifs_ctxless == 0) ||
1366             WARN_ON(n_ctx > 1 && !local->use_chanctx) ||
1367             WARN_ON(!new_ctx && !local->use_chanctx)) {
1368                 err = -EINVAL;
1369                 goto err;
1370         }
1371 
1372         /*
1373          * All necessary vifs are ready. Perform the switch now depending on
1374          * reservations and driver capabilities.
1375          */
1376 
1377         if (local->use_chanctx) {
1378                 if (n_vifs_switch > 0) {
1379                         err = ieee80211_chsw_switch_vifs(local, n_vifs_switch);
1380                         if (err)
1381                                 goto err;
1382                 }
1383 
1384                 if (n_vifs_assign > 0 || n_vifs_ctxless > 0) {
1385                         err = ieee80211_chsw_switch_ctxs(local);
1386                         if (err)
1387                                 goto err;
1388                 }
1389         } else {
1390                 err = ieee80211_chsw_switch_hwconf(local, new_ctx);
1391                 if (err)
1392                         goto err;
1393         }
1394 
1395         /*
1396          * Update all structures, values and pointers to point to new channel
1397          * context(s).
1398          */
1399 
1400         i = 0;
1401         list_for_each_entry(ctx, &local->chanctx_list, list) {
1402                 if (ctx->replace_state != IEEE80211_CHANCTX_REPLACES_OTHER)
1403                         continue;
1404 
1405                 if (WARN_ON(!ctx->replace_ctx)) {
1406                         err = -EINVAL;
1407                         goto err;
1408                 }
1409 
1410                 list_for_each_entry(sdata, &ctx->reserved_vifs,
1411                                     reserved_chanctx_list) {
1412                         u32 changed = 0;
1413 
1414                         if (!ieee80211_vif_has_in_place_reservation(sdata))
1415                                 continue;
1416 
1417                         rcu_assign_pointer(sdata->vif.chanctx_conf, &ctx->conf);
1418 
1419                         if (sdata->vif.type == NL80211_IFTYPE_AP)
1420                                 __ieee80211_vif_copy_chanctx_to_vlans(sdata,
1421                                                                       false);
1422 
1423                         sdata->radar_required = sdata->reserved_radar_required;
1424 
1425                         if (sdata->vif.bss_conf.chandef.width !=
1426                             sdata->reserved_chandef.width)
1427                                 changed = BSS_CHANGED_BANDWIDTH;
1428 
1429                         sdata->vif.bss_conf.chandef = sdata->reserved_chandef;
1430                         if (changed)
1431                                 ieee80211_bss_info_change_notify(sdata,
1432                                                                  changed);
1433 
1434                         ieee80211_recalc_txpower(sdata);
1435                 }
1436 
1437                 ieee80211_recalc_chanctx_chantype(local, ctx);
1438                 ieee80211_recalc_smps_chanctx(local, ctx);
1439                 ieee80211_recalc_radar_chanctx(local, ctx);
1440                 ieee80211_recalc_chanctx_min_def(local, ctx);
1441 
1442                 list_for_each_entry_safe(sdata, sdata_tmp, &ctx->reserved_vifs,
1443                                          reserved_chanctx_list) {
1444                         if (ieee80211_vif_get_chanctx(sdata) != ctx)
1445                                 continue;
1446 
1447                         list_del(&sdata->reserved_chanctx_list);
1448                         list_move(&sdata->assigned_chanctx_list,
1449                                   &ctx->assigned_vifs);
1450                         sdata->reserved_chanctx = NULL;
1451 
1452                         ieee80211_vif_chanctx_reservation_complete(sdata);
1453                 }
1454 
1455                 /*
1456                  * This context might have been a dependency for an already
1457                  * ready re-assign reservation interface that was deferred. Do
1458                  * not propagate error to the caller though. The in-place
1459                  * reservation for originally requested interface has already
1460                  * succeeded at this point.
1461                  */
1462                 list_for_each_entry_safe(sdata, sdata_tmp, &ctx->reserved_vifs,
1463                                          reserved_chanctx_list) {
1464                         if (WARN_ON(ieee80211_vif_has_in_place_reservation(
1465                                         sdata)))
1466                                 continue;
1467 
1468                         if (WARN_ON(sdata->reserved_chanctx != ctx))
1469                                 continue;
1470 
1471                         if (!sdata->reserved_ready)
1472                                 continue;
1473 
1474                         if (ieee80211_vif_get_chanctx(sdata))
1475                                 err = ieee80211_vif_use_reserved_reassign(
1476                                                 sdata);
1477                         else
1478                                 err = ieee80211_vif_use_reserved_assign(sdata);
1479 
1480                         if (err) {
1481                                 sdata_info(sdata,
1482                                            "failed to finalize (re-)assign reservation (err=%d)\n",
1483                                            err);
1484                                 ieee80211_vif_unreserve_chanctx(sdata);
1485                                 cfg80211_stop_iface(local->hw.wiphy,
1486                                                     &sdata->wdev,
1487                                                     GFP_KERNEL);
1488                         }
1489                 }
1490         }
1491 
1492         /*
1493          * Finally free old contexts
1494          */
1495 
1496         list_for_each_entry_safe(ctx, ctx_tmp, &local->chanctx_list, list) {
1497                 if (ctx->replace_state != IEEE80211_CHANCTX_WILL_BE_REPLACED)
1498                         continue;
1499 
1500                 ctx->replace_ctx->replace_ctx = NULL;
1501                 ctx->replace_ctx->replace_state =
1502                                 IEEE80211_CHANCTX_REPLACE_NONE;
1503 
1504                 list_del_rcu(&ctx->list);
1505                 kfree_rcu(ctx, rcu_head);
1506         }
1507 
1508         return 0;
1509 
1510 err:
1511         list_for_each_entry(ctx, &local->chanctx_list, list) {
1512                 if (ctx->replace_state != IEEE80211_CHANCTX_REPLACES_OTHER)
1513                         continue;
1514 
1515                 list_for_each_entry_safe(sdata, sdata_tmp, &ctx->reserved_vifs,
1516                                          reserved_chanctx_list) {
1517                         ieee80211_vif_unreserve_chanctx(sdata);
1518                         ieee80211_vif_chanctx_reservation_complete(sdata);
1519                 }
1520         }
1521 
1522         return err;
1523 }
1524 
1525 int ieee80211_vif_use_reserved_context(struct ieee80211_sub_if_data *sdata)
1526 {
1527         struct ieee80211_local *local = sdata->local;
1528         struct ieee80211_chanctx *new_ctx;
1529         struct ieee80211_chanctx *old_ctx;
1530         int err;
1531 
1532         lockdep_assert_held(&local->mtx);
1533         lockdep_assert_held(&local->chanctx_mtx);
1534 
1535         new_ctx = sdata->reserved_chanctx;
1536         old_ctx = ieee80211_vif_get_chanctx(sdata);
1537 
1538         if (WARN_ON(!new_ctx))
1539                 return -EINVAL;
1540 
1541         if (WARN_ON(new_ctx->replace_state ==
1542                     IEEE80211_CHANCTX_WILL_BE_REPLACED))
1543                 return -EINVAL;
1544 
1545         if (WARN_ON(sdata->reserved_ready))
1546                 return -EINVAL;
1547 
1548         sdata->reserved_ready = true;
1549 
1550         if (new_ctx->replace_state == IEEE80211_CHANCTX_REPLACE_NONE) {
1551                 if (old_ctx)
1552                         err = ieee80211_vif_use_reserved_reassign(sdata);
1553                 else
1554                         err = ieee80211_vif_use_reserved_assign(sdata);
1555 
1556                 if (err)
1557                         return err;
1558         }
1559 
1560         /*
1561          * In-place reservation may need to be finalized now either if:
1562          *  a) sdata is taking part in the swapping itself and is the last one
1563          *  b) sdata has switched with a re-assign reservation to an existing
1564          *     context readying in-place switching of old_ctx
1565          *
1566          * In case of (b) do not propagate the error up because the requested
1567          * sdata already switched successfully. Just spill an extra warning.
1568          * The ieee80211_vif_use_reserved_switch() already stops all necessary
1569          * interfaces upon failure.
1570          */
1571         if ((old_ctx &&
1572              old_ctx->replace_state == IEEE80211_CHANCTX_WILL_BE_REPLACED) ||
1573             new_ctx->replace_state == IEEE80211_CHANCTX_REPLACES_OTHER) {
1574                 err = ieee80211_vif_use_reserved_switch(local);
1575                 if (err && err != -EAGAIN) {
1576                         if (new_ctx->replace_state ==
1577                             IEEE80211_CHANCTX_REPLACES_OTHER)
1578                                 return err;
1579 
1580                         wiphy_info(local->hw.wiphy,
1581                                    "depending in-place reservation failed (err=%d)\n",
1582                                    err);
1583                 }
1584         }
1585 
1586         return 0;
1587 }
1588 
1589 int ieee80211_vif_change_bandwidth(struct ieee80211_sub_if_data *sdata,
1590                                    const struct cfg80211_chan_def *chandef,
1591                                    u32 *changed)
1592 {
1593         struct ieee80211_local *local = sdata->local;
1594         struct ieee80211_chanctx_conf *conf;
1595         struct ieee80211_chanctx *ctx;
1596         const struct cfg80211_chan_def *compat;
1597         int ret;
1598 
1599         if (!cfg80211_chandef_usable(sdata->local->hw.wiphy, chandef,
1600                                      IEEE80211_CHAN_DISABLED))
1601                 return -EINVAL;
1602 
1603         mutex_lock(&local->chanctx_mtx);
1604         if (cfg80211_chandef_identical(chandef, &sdata->vif.bss_conf.chandef)) {
1605                 ret = 0;
1606                 goto out;
1607         }
1608 
1609         if (chandef->width == NL80211_CHAN_WIDTH_20_NOHT ||
1610             sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_20_NOHT) {
1611                 ret = -EINVAL;
1612                 goto out;
1613         }
1614 
1615         conf = rcu_dereference_protected(sdata->vif.chanctx_conf,
1616                                          lockdep_is_held(&local->chanctx_mtx));
1617         if (!conf) {
1618                 ret = -EINVAL;
1619                 goto out;
1620         }
1621 
1622         ctx = container_of(conf, struct ieee80211_chanctx, conf);
1623 
1624         compat = cfg80211_chandef_compatible(&conf->def, chandef);
1625         if (!compat) {
1626                 ret = -EINVAL;
1627                 goto out;
1628         }
1629 
1630         switch (ctx->replace_state) {
1631         case IEEE80211_CHANCTX_REPLACE_NONE:
1632                 if (!ieee80211_chanctx_reserved_chandef(local, ctx, compat)) {
1633                         ret = -EBUSY;
1634                         goto out;
1635                 }
1636                 break;
1637         case IEEE80211_CHANCTX_WILL_BE_REPLACED:
1638                 /* TODO: Perhaps the bandwith change could be treated as a
1639                  * reservation itself? */
1640                 ret = -EBUSY;
1641                 goto out;
1642         case IEEE80211_CHANCTX_REPLACES_OTHER:
1643                 /* channel context that is going to replace another channel
1644                  * context doesn't really exist and shouldn't be assigned
1645                  * anywhere yet */
1646                 WARN_ON(1);
1647                 break;
1648         }
1649 
1650         sdata->vif.bss_conf.chandef = *chandef;
1651 
1652         ieee80211_recalc_chanctx_chantype(local, ctx);
1653 
1654         *changed |= BSS_CHANGED_BANDWIDTH;
1655         ret = 0;
1656  out:
1657         mutex_unlock(&local->chanctx_mtx);
1658         return ret;
1659 }
1660 
1661 void ieee80211_vif_release_channel(struct ieee80211_sub_if_data *sdata)
1662 {
1663         WARN_ON(sdata->dev && netif_carrier_ok(sdata->dev));
1664 
1665         lockdep_assert_held(&sdata->local->mtx);
1666 
1667         mutex_lock(&sdata->local->chanctx_mtx);
1668         __ieee80211_vif_release_channel(sdata);
1669         mutex_unlock(&sdata->local->chanctx_mtx);
1670 }
1671 
1672 void ieee80211_vif_vlan_copy_chanctx(struct ieee80211_sub_if_data *sdata)
1673 {
1674         struct ieee80211_local *local = sdata->local;
1675         struct ieee80211_sub_if_data *ap;
1676         struct ieee80211_chanctx_conf *conf;
1677 
1678         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_AP_VLAN || !sdata->bss))
1679                 return;
1680 
1681         ap = container_of(sdata->bss, struct ieee80211_sub_if_data, u.ap);
1682 
1683         mutex_lock(&local->chanctx_mtx);
1684 
1685         conf = rcu_dereference_protected(ap->vif.chanctx_conf,
1686                                          lockdep_is_held(&local->chanctx_mtx));
1687         rcu_assign_pointer(sdata->vif.chanctx_conf, conf);
1688         mutex_unlock(&local->chanctx_mtx);
1689 }
1690 
1691 void ieee80211_iter_chan_contexts_atomic(
1692         struct ieee80211_hw *hw,
1693         void (*iter)(struct ieee80211_hw *hw,
1694                      struct ieee80211_chanctx_conf *chanctx_conf,
1695                      void *data),
1696         void *iter_data)
1697 {
1698         struct ieee80211_local *local = hw_to_local(hw);
1699         struct ieee80211_chanctx *ctx;
1700 
1701         rcu_read_lock();
1702         list_for_each_entry_rcu(ctx, &local->chanctx_list, list)
1703                 if (ctx->driver_present)
1704                         iter(hw, &ctx->conf, iter_data);
1705         rcu_read_unlock();
1706 }
1707 EXPORT_SYMBOL_GPL(ieee80211_iter_chan_contexts_atomic);
1708 

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