2 * mac80211 - channel management
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"
12 static int ieee80211_chanctx_num_assigned(struct ieee80211_local *local,
13 struct ieee80211_chanctx *ctx)
15 struct ieee80211_sub_if_data *sdata;
18 lockdep_assert_held(&local->chanctx_mtx);
20 list_for_each_entry(sdata, &ctx->assigned_vifs, assigned_chanctx_list)
26 static int ieee80211_chanctx_num_reserved(struct ieee80211_local *local,
27 struct ieee80211_chanctx *ctx)
29 struct ieee80211_sub_if_data *sdata;
32 lockdep_assert_held(&local->chanctx_mtx);
34 list_for_each_entry(sdata, &ctx->reserved_vifs, reserved_chanctx_list)
40 int ieee80211_chanctx_refcount(struct ieee80211_local *local,
41 struct ieee80211_chanctx *ctx)
43 return ieee80211_chanctx_num_assigned(local, ctx) +
44 ieee80211_chanctx_num_reserved(local, ctx);
47 static int ieee80211_num_chanctx(struct ieee80211_local *local)
49 struct ieee80211_chanctx *ctx;
52 lockdep_assert_held(&local->chanctx_mtx);
54 list_for_each_entry(ctx, &local->chanctx_list, list)
60 static bool ieee80211_can_create_new_chanctx(struct ieee80211_local *local)
62 lockdep_assert_held(&local->chanctx_mtx);
63 return ieee80211_num_chanctx(local) < ieee80211_max_num_channels(local);
66 static struct ieee80211_chanctx *
67 ieee80211_vif_get_chanctx(struct ieee80211_sub_if_data *sdata)
69 struct ieee80211_local *local = sdata->local;
70 struct ieee80211_chanctx_conf *conf;
72 conf = rcu_dereference_protected(sdata->vif.chanctx_conf,
73 lockdep_is_held(&local->chanctx_mtx));
77 return container_of(conf, struct ieee80211_chanctx, conf);
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)
85 struct ieee80211_sub_if_data *sdata;
87 lockdep_assert_held(&local->chanctx_mtx);
89 list_for_each_entry(sdata, &ctx->reserved_vifs,
90 reserved_chanctx_list) {
92 compat = &sdata->reserved_chandef;
94 compat = cfg80211_chandef_compatible(&sdata->reserved_chandef,
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)
108 struct ieee80211_sub_if_data *sdata;
110 lockdep_assert_held(&local->chanctx_mtx);
112 list_for_each_entry(sdata, &ctx->assigned_vifs,
113 assigned_chanctx_list) {
114 if (sdata->reserved_chanctx != NULL)
118 compat = &sdata->vif.bss_conf.chandef;
120 compat = cfg80211_chandef_compatible(
121 &sdata->vif.bss_conf.chandef, compat);
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)
134 lockdep_assert_held(&local->chanctx_mtx);
136 compat = ieee80211_chanctx_reserved_chandef(local, ctx, compat);
140 compat = ieee80211_chanctx_non_reserved_chandef(local, ctx, compat);
148 ieee80211_chanctx_can_reserve_chandef(struct ieee80211_local *local,
149 struct ieee80211_chanctx *ctx,
150 const struct cfg80211_chan_def *def)
152 lockdep_assert_held(&local->chanctx_mtx);
154 if (ieee80211_chanctx_combined_chandef(local, ctx, def))
157 if (!list_empty(&ctx->reserved_vifs) &&
158 ieee80211_chanctx_reserved_chandef(local, ctx, def))
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)
169 struct ieee80211_chanctx *ctx;
171 lockdep_assert_held(&local->chanctx_mtx);
173 if (mode == IEEE80211_CHANCTX_EXCLUSIVE)
176 list_for_each_entry(ctx, &local->chanctx_list, list) {
177 if (ctx->replace_state == IEEE80211_CHANCTX_WILL_BE_REPLACED)
180 if (ctx->mode == IEEE80211_CHANCTX_EXCLUSIVE)
183 if (!ieee80211_chanctx_can_reserve_chandef(local, ctx,
193 static enum nl80211_chan_width ieee80211_get_sta_bw(struct ieee80211_sta *sta)
195 switch (sta->bandwidth) {
196 case IEEE80211_STA_RX_BW_20:
197 if (sta->ht_cap.ht_supported)
198 return NL80211_CHAN_WIDTH_20;
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:
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).
215 return NL80211_CHAN_WIDTH_160;
218 return NL80211_CHAN_WIDTH_20;
222 static enum nl80211_chan_width
223 ieee80211_get_max_required_bw(struct ieee80211_sub_if_data *sdata)
225 enum nl80211_chan_width max_bw = NL80211_CHAN_WIDTH_20_NOHT;
226 struct sta_info *sta;
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))
237 max_bw = max(max_bw, ieee80211_get_sta_bw(&sta->sta));
244 static enum nl80211_chan_width
245 ieee80211_get_chanctx_max_required_bw(struct ieee80211_local *local,
246 struct ieee80211_chanctx_conf *conf)
248 struct ieee80211_sub_if_data *sdata;
249 enum nl80211_chan_width max_bw = NL80211_CHAN_WIDTH_20_NOHT;
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;
256 if (!ieee80211_sdata_running(sdata))
259 if (rcu_access_pointer(sdata->vif.chanctx_conf) != conf)
263 case NL80211_IFTYPE_AP:
264 case NL80211_IFTYPE_AP_VLAN:
265 width = ieee80211_get_max_required_bw(sdata);
267 case NL80211_IFTYPE_P2P_DEVICE:
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;
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:
282 max_bw = max(max_bw, width);
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);
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
300 void ieee80211_recalc_chanctx_min_def(struct ieee80211_local *local,
301 struct ieee80211_chanctx *ctx)
303 enum nl80211_chan_width max_bw;
304 struct cfg80211_chan_def min_def;
306 lockdep_assert_held(&local->chanctx_mtx);
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;
316 max_bw = ieee80211_get_chanctx_max_required_bw(local, &ctx->conf);
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);
323 if (cfg80211_chandef_identical(&ctx->conf.min_def, &min_def))
326 ctx->conf.min_def = min_def;
327 if (!ctx->driver_present)
330 drv_change_chanctx(local, ctx, IEEE80211_CHANCTX_CHANGE_MIN_WIDTH);
333 static void ieee80211_change_chanctx(struct ieee80211_local *local,
334 struct ieee80211_chanctx *ctx,
335 const struct cfg80211_chan_def *chandef)
337 if (cfg80211_chandef_identical(&ctx->conf.def, chandef))
340 WARN_ON(!cfg80211_chandef_compatible(&ctx->conf.def, chandef));
342 ctx->conf.def = *chandef;
343 drv_change_chanctx(local, ctx, IEEE80211_CHANCTX_CHANGE_WIDTH);
344 ieee80211_recalc_chanctx_min_def(local, ctx);
346 if (!local->use_chanctx) {
347 local->_oper_chandef = *chandef;
348 ieee80211_hw_config(local, 0);
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)
357 struct ieee80211_chanctx *ctx;
359 lockdep_assert_held(&local->chanctx_mtx);
361 if (mode == IEEE80211_CHANCTX_EXCLUSIVE)
364 list_for_each_entry(ctx, &local->chanctx_list, list) {
365 const struct cfg80211_chan_def *compat;
367 if (ctx->replace_state != IEEE80211_CHANCTX_REPLACE_NONE)
370 if (ctx->mode == IEEE80211_CHANCTX_EXCLUSIVE)
373 compat = cfg80211_chandef_compatible(&ctx->conf.def, chandef);
377 compat = ieee80211_chanctx_reserved_chandef(local, ctx,
382 ieee80211_change_chanctx(local, ctx, compat);
390 static bool ieee80211_is_radar_required(struct ieee80211_local *local)
392 struct ieee80211_sub_if_data *sdata;
394 lockdep_assert_held(&local->mtx);
397 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
398 if (sdata->radar_required) {
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)
413 struct ieee80211_chanctx *ctx;
415 lockdep_assert_held(&local->chanctx_mtx);
417 ctx = kzalloc(sizeof(*ctx) + local->hw.chanctx_data_size, GFP_KERNEL);
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;
427 ctx->conf.radar_enabled = ieee80211_is_radar_required(local);
428 ieee80211_recalc_chanctx_min_def(local, ctx);
433 static int ieee80211_add_chanctx(struct ieee80211_local *local,
434 struct ieee80211_chanctx *ctx)
439 lockdep_assert_held(&local->mtx);
440 lockdep_assert_held(&local->chanctx_mtx);
442 if (!local->use_chanctx)
443 local->hw.conf.radar_enabled = ctx->conf.radar_enabled;
445 /* turn idle off *before* setting channel -- some drivers need that */
446 changed = ieee80211_idle_off(local);
448 ieee80211_hw_config(local, changed);
450 if (!local->use_chanctx) {
451 local->_oper_chandef = ctx->conf.def;
452 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL);
454 err = drv_add_chanctx(local, ctx);
456 ieee80211_recalc_idle(local);
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)
469 struct ieee80211_chanctx *ctx;
472 lockdep_assert_held(&local->mtx);
473 lockdep_assert_held(&local->chanctx_mtx);
475 ctx = ieee80211_alloc_chanctx(local, chandef, mode);
477 return ERR_PTR(-ENOMEM);
479 err = ieee80211_add_chanctx(local, ctx);
485 list_add_rcu(&ctx->list, &local->chanctx_list);
489 static void ieee80211_del_chanctx(struct ieee80211_local *local,
490 struct ieee80211_chanctx *ctx)
492 lockdep_assert_held(&local->chanctx_mtx);
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;
500 /* NOTE: Disabling radar is only valid here for
501 * single channel context. To be sure, check it ...
503 WARN_ON(local->hw.conf.radar_enabled &&
504 !list_empty(&local->chanctx_list));
506 local->hw.conf.radar_enabled = false;
508 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL);
510 drv_remove_chanctx(local, ctx);
513 ieee80211_recalc_idle(local);
516 static void ieee80211_free_chanctx(struct ieee80211_local *local,
517 struct ieee80211_chanctx *ctx)
519 lockdep_assert_held(&local->chanctx_mtx);
521 WARN_ON_ONCE(ieee80211_chanctx_refcount(local, ctx) != 0);
523 list_del_rcu(&ctx->list);
524 ieee80211_del_chanctx(local, ctx);
525 kfree_rcu(ctx, rcu_head);
528 static void ieee80211_recalc_chanctx_chantype(struct ieee80211_local *local,
529 struct ieee80211_chanctx *ctx)
531 struct ieee80211_chanctx_conf *conf = &ctx->conf;
532 struct ieee80211_sub_if_data *sdata;
533 const struct cfg80211_chan_def *compat = NULL;
535 lockdep_assert_held(&local->chanctx_mtx);
538 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
540 if (!ieee80211_sdata_running(sdata))
542 if (rcu_access_pointer(sdata->vif.chanctx_conf) != conf)
546 compat = &sdata->vif.bss_conf.chandef;
548 compat = cfg80211_chandef_compatible(
549 &sdata->vif.bss_conf.chandef, compat);
555 if (WARN_ON_ONCE(!compat))
558 ieee80211_change_chanctx(local, ctx, compat);
561 static void ieee80211_recalc_radar_chanctx(struct ieee80211_local *local,
562 struct ieee80211_chanctx *chanctx)
566 lockdep_assert_held(&local->chanctx_mtx);
567 /* for setting local->radar_detect_enabled */
568 lockdep_assert_held(&local->mtx);
570 radar_enabled = ieee80211_is_radar_required(local);
572 if (radar_enabled == chanctx->conf.radar_enabled)
575 chanctx->conf.radar_enabled = radar_enabled;
576 local->radar_detect_enabled = chanctx->conf.radar_enabled;
578 if (!local->use_chanctx) {
579 local->hw.conf.radar_enabled = chanctx->conf.radar_enabled;
580 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL);
583 drv_change_chanctx(local, chanctx, IEEE80211_CHANCTX_CHANGE_RADAR);
586 static int ieee80211_assign_vif_chanctx(struct ieee80211_sub_if_data *sdata,
587 struct ieee80211_chanctx *new_ctx)
589 struct ieee80211_local *local = sdata->local;
590 struct ieee80211_chanctx_conf *conf;
591 struct ieee80211_chanctx *curr_ctx = NULL;
594 conf = rcu_dereference_protected(sdata->vif.chanctx_conf,
595 lockdep_is_held(&local->chanctx_mtx));
598 curr_ctx = container_of(conf, struct ieee80211_chanctx, conf);
600 drv_unassign_vif_chanctx(local, sdata, curr_ctx);
602 list_del(&sdata->assigned_chanctx_list);
606 ret = drv_assign_vif_chanctx(local, sdata, new_ctx);
610 conf = &new_ctx->conf;
611 list_add(&sdata->assigned_chanctx_list,
612 &new_ctx->assigned_vifs);
616 rcu_assign_pointer(sdata->vif.chanctx_conf, conf);
618 sdata->vif.bss_conf.idle = !conf;
620 if (curr_ctx && ieee80211_chanctx_num_assigned(local, curr_ctx) > 0) {
621 ieee80211_recalc_chanctx_chantype(local, curr_ctx);
622 ieee80211_recalc_smps_chanctx(local, curr_ctx);
623 ieee80211_recalc_radar_chanctx(local, curr_ctx);
624 ieee80211_recalc_chanctx_min_def(local, curr_ctx);
627 if (new_ctx && ieee80211_chanctx_num_assigned(local, new_ctx) > 0) {
628 ieee80211_recalc_txpower(sdata);
629 ieee80211_recalc_chanctx_min_def(local, new_ctx);
632 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE &&
633 sdata->vif.type != NL80211_IFTYPE_MONITOR)
634 ieee80211_bss_info_change_notify(sdata,
640 static void __ieee80211_vif_release_channel(struct ieee80211_sub_if_data *sdata)
642 struct ieee80211_local *local = sdata->local;
643 struct ieee80211_chanctx_conf *conf;
644 struct ieee80211_chanctx *ctx;
645 bool use_reserved_switch = false;
647 lockdep_assert_held(&local->chanctx_mtx);
649 conf = rcu_dereference_protected(sdata->vif.chanctx_conf,
650 lockdep_is_held(&local->chanctx_mtx));
654 ctx = container_of(conf, struct ieee80211_chanctx, conf);
656 if (sdata->reserved_chanctx) {
657 if (sdata->reserved_chanctx->replace_state ==
658 IEEE80211_CHANCTX_REPLACES_OTHER &&
659 ieee80211_chanctx_num_reserved(local,
660 sdata->reserved_chanctx) > 1)
661 use_reserved_switch = true;
663 ieee80211_vif_unreserve_chanctx(sdata);
666 ieee80211_assign_vif_chanctx(sdata, NULL);
667 if (ieee80211_chanctx_refcount(local, ctx) == 0)
668 ieee80211_free_chanctx(local, ctx);
670 /* Unreserving may ready an in-place reservation. */
671 if (use_reserved_switch)
672 ieee80211_vif_use_reserved_switch(local);
675 void ieee80211_recalc_smps_chanctx(struct ieee80211_local *local,
676 struct ieee80211_chanctx *chanctx)
678 struct ieee80211_sub_if_data *sdata;
679 u8 rx_chains_static, rx_chains_dynamic;
681 lockdep_assert_held(&local->chanctx_mtx);
683 rx_chains_static = 1;
684 rx_chains_dynamic = 1;
687 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
688 u8 needed_static, needed_dynamic;
690 if (!ieee80211_sdata_running(sdata))
693 if (rcu_access_pointer(sdata->vif.chanctx_conf) !=
697 switch (sdata->vif.type) {
698 case NL80211_IFTYPE_P2P_DEVICE:
700 case NL80211_IFTYPE_STATION:
701 if (!sdata->u.mgd.associated)
704 case NL80211_IFTYPE_AP_VLAN:
706 case NL80211_IFTYPE_AP:
707 case NL80211_IFTYPE_ADHOC:
708 case NL80211_IFTYPE_WDS:
709 case NL80211_IFTYPE_MESH_POINT:
715 switch (sdata->smps_mode) {
717 WARN_ONCE(1, "Invalid SMPS mode %d\n",
720 case IEEE80211_SMPS_OFF:
721 needed_static = sdata->needed_rx_chains;
722 needed_dynamic = sdata->needed_rx_chains;
724 case IEEE80211_SMPS_DYNAMIC:
726 needed_dynamic = sdata->needed_rx_chains;
728 case IEEE80211_SMPS_STATIC:
734 rx_chains_static = max(rx_chains_static, needed_static);
735 rx_chains_dynamic = max(rx_chains_dynamic, needed_dynamic);
738 /* Disable SMPS for the monitor interface */
739 sdata = rcu_dereference(local->monitor_sdata);
741 rcu_access_pointer(sdata->vif.chanctx_conf) == &chanctx->conf)
742 rx_chains_dynamic = rx_chains_static = local->rx_chains;
746 if (!local->use_chanctx) {
747 if (rx_chains_static > 1)
748 local->smps_mode = IEEE80211_SMPS_OFF;
749 else if (rx_chains_dynamic > 1)
750 local->smps_mode = IEEE80211_SMPS_DYNAMIC;
752 local->smps_mode = IEEE80211_SMPS_STATIC;
753 ieee80211_hw_config(local, 0);
756 if (rx_chains_static == chanctx->conf.rx_chains_static &&
757 rx_chains_dynamic == chanctx->conf.rx_chains_dynamic)
760 chanctx->conf.rx_chains_static = rx_chains_static;
761 chanctx->conf.rx_chains_dynamic = rx_chains_dynamic;
762 drv_change_chanctx(local, chanctx, IEEE80211_CHANCTX_CHANGE_RX_CHAINS);
765 int ieee80211_vif_use_channel(struct ieee80211_sub_if_data *sdata,
766 const struct cfg80211_chan_def *chandef,
767 enum ieee80211_chanctx_mode mode)
769 struct ieee80211_local *local = sdata->local;
770 struct ieee80211_chanctx *ctx;
771 u8 radar_detect_width = 0;
774 lockdep_assert_held(&local->mtx);
776 WARN_ON(sdata->dev && netif_carrier_ok(sdata->dev));
778 mutex_lock(&local->chanctx_mtx);
780 ret = cfg80211_chandef_dfs_required(local->hw.wiphy,
786 radar_detect_width = BIT(chandef->width);
788 sdata->radar_required = ret;
790 ret = ieee80211_check_combinations(sdata, chandef, mode,
795 __ieee80211_vif_release_channel(sdata);
797 ctx = ieee80211_find_chanctx(local, chandef, mode);
799 ctx = ieee80211_new_chanctx(local, chandef, mode);
805 sdata->vif.bss_conf.chandef = *chandef;
807 ret = ieee80211_assign_vif_chanctx(sdata, ctx);
809 /* if assign fails refcount stays the same */
810 if (ieee80211_chanctx_refcount(local, ctx) == 0)
811 ieee80211_free_chanctx(local, ctx);
815 ieee80211_recalc_smps_chanctx(local, ctx);
816 ieee80211_recalc_radar_chanctx(local, ctx);
818 mutex_unlock(&local->chanctx_mtx);
823 __ieee80211_vif_copy_chanctx_to_vlans(struct ieee80211_sub_if_data *sdata,
826 struct ieee80211_local *local __maybe_unused = sdata->local;
827 struct ieee80211_sub_if_data *vlan;
828 struct ieee80211_chanctx_conf *conf;
830 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_AP))
833 lockdep_assert_held(&local->mtx);
835 /* Check that conf exists, even when clearing this function
836 * must be called with the AP's channel context still there
837 * as it would otherwise cause VLANs to have an invalid
838 * channel context pointer for a while, possibly pointing
839 * to a channel context that has already been freed.
841 conf = rcu_dereference_protected(sdata->vif.chanctx_conf,
842 lockdep_is_held(&local->chanctx_mtx));
848 list_for_each_entry(vlan, &sdata->u.ap.vlans, u.vlan.list)
849 rcu_assign_pointer(vlan->vif.chanctx_conf, conf);
852 void ieee80211_vif_copy_chanctx_to_vlans(struct ieee80211_sub_if_data *sdata,
855 struct ieee80211_local *local = sdata->local;
857 mutex_lock(&local->chanctx_mtx);
859 __ieee80211_vif_copy_chanctx_to_vlans(sdata, clear);
861 mutex_unlock(&local->chanctx_mtx);
864 int ieee80211_vif_unreserve_chanctx(struct ieee80211_sub_if_data *sdata)
866 struct ieee80211_chanctx *ctx = sdata->reserved_chanctx;
868 lockdep_assert_held(&sdata->local->chanctx_mtx);
873 list_del(&sdata->reserved_chanctx_list);
874 sdata->reserved_chanctx = NULL;
876 if (ieee80211_chanctx_refcount(sdata->local, ctx) == 0) {
877 if (ctx->replace_state == IEEE80211_CHANCTX_REPLACES_OTHER) {
878 if (WARN_ON(!ctx->replace_ctx))
881 WARN_ON(ctx->replace_ctx->replace_state !=
882 IEEE80211_CHANCTX_WILL_BE_REPLACED);
883 WARN_ON(ctx->replace_ctx->replace_ctx != ctx);
885 ctx->replace_ctx->replace_ctx = NULL;
886 ctx->replace_ctx->replace_state =
887 IEEE80211_CHANCTX_REPLACE_NONE;
889 list_del_rcu(&ctx->list);
890 kfree_rcu(ctx, rcu_head);
892 ieee80211_free_chanctx(sdata->local, ctx);
899 int ieee80211_vif_reserve_chanctx(struct ieee80211_sub_if_data *sdata,
900 const struct cfg80211_chan_def *chandef,
901 enum ieee80211_chanctx_mode mode,
904 struct ieee80211_local *local = sdata->local;
905 struct ieee80211_chanctx *new_ctx, *curr_ctx, *ctx;
907 lockdep_assert_held(&local->chanctx_mtx);
909 curr_ctx = ieee80211_vif_get_chanctx(sdata);
910 if (curr_ctx && local->use_chanctx && !local->ops->switch_vif_chanctx)
913 new_ctx = ieee80211_find_reservation_chanctx(local, chandef, mode);
915 if (ieee80211_can_create_new_chanctx(local)) {
916 new_ctx = ieee80211_new_chanctx(local, chandef, mode);
918 return PTR_ERR(new_ctx);
921 (curr_ctx->replace_state ==
922 IEEE80211_CHANCTX_WILL_BE_REPLACED) ||
923 !list_empty(&curr_ctx->reserved_vifs)) {
925 * Another vif already requested this context
926 * for a reservation. Find another one hoping
927 * all vifs assigned to it will also switch
930 * TODO: This needs a little more work as some
931 * cases (more than 2 chanctx capable devices)
932 * may fail which could otherwise succeed
933 * provided some channel context juggling was
936 * Consider ctx1..3, vif1..6, each ctx has 2
937 * vifs. vif1 and vif2 from ctx1 request new
938 * different chandefs starting 2 in-place
939 * reserations with ctx4 and ctx5 replacing
940 * ctx1 and ctx2 respectively. Next vif5 and
941 * vif6 from ctx3 reserve ctx4. If vif3 and
942 * vif4 remain on ctx2 as they are then this
943 * fails unless `replace_ctx` from ctx5 is
944 * replaced with ctx3.
946 list_for_each_entry(ctx, &local->chanctx_list,
948 if (ctx->replace_state !=
949 IEEE80211_CHANCTX_REPLACE_NONE)
952 if (!list_empty(&ctx->reserved_vifs))
961 * If that's true then all available contexts already
962 * have reservations and cannot be used.
965 (curr_ctx->replace_state ==
966 IEEE80211_CHANCTX_WILL_BE_REPLACED) ||
967 !list_empty(&curr_ctx->reserved_vifs))
970 new_ctx = ieee80211_alloc_chanctx(local, chandef, mode);
974 new_ctx->replace_ctx = curr_ctx;
975 new_ctx->replace_state =
976 IEEE80211_CHANCTX_REPLACES_OTHER;
978 curr_ctx->replace_ctx = new_ctx;
979 curr_ctx->replace_state =
980 IEEE80211_CHANCTX_WILL_BE_REPLACED;
982 list_add_rcu(&new_ctx->list, &local->chanctx_list);
986 list_add(&sdata->reserved_chanctx_list, &new_ctx->reserved_vifs);
987 sdata->reserved_chanctx = new_ctx;
988 sdata->reserved_chandef = *chandef;
989 sdata->reserved_radar_required = radar_required;
990 sdata->reserved_ready = false;
996 ieee80211_vif_chanctx_reservation_complete(struct ieee80211_sub_if_data *sdata)
998 switch (sdata->vif.type) {
999 case NL80211_IFTYPE_ADHOC:
1000 case NL80211_IFTYPE_AP:
1001 case NL80211_IFTYPE_MESH_POINT:
1002 ieee80211_queue_work(&sdata->local->hw,
1003 &sdata->csa_finalize_work);
1005 case NL80211_IFTYPE_STATION:
1006 ieee80211_queue_work(&sdata->local->hw,
1007 &sdata->u.mgd.chswitch_work);
1009 case NL80211_IFTYPE_UNSPECIFIED:
1010 case NL80211_IFTYPE_AP_VLAN:
1011 case NL80211_IFTYPE_WDS:
1012 case NL80211_IFTYPE_MONITOR:
1013 case NL80211_IFTYPE_P2P_CLIENT:
1014 case NL80211_IFTYPE_P2P_GO:
1015 case NL80211_IFTYPE_P2P_DEVICE:
1016 case NUM_NL80211_IFTYPES:
1023 ieee80211_vif_use_reserved_reassign(struct ieee80211_sub_if_data *sdata)
1025 struct ieee80211_local *local = sdata->local;
1026 struct ieee80211_vif_chanctx_switch vif_chsw[1] = {};
1027 struct ieee80211_chanctx *old_ctx, *new_ctx;
1028 const struct cfg80211_chan_def *chandef;
1032 lockdep_assert_held(&local->mtx);
1033 lockdep_assert_held(&local->chanctx_mtx);
1035 new_ctx = sdata->reserved_chanctx;
1036 old_ctx = ieee80211_vif_get_chanctx(sdata);
1038 if (WARN_ON(!sdata->reserved_ready))
1041 if (WARN_ON(!new_ctx))
1044 if (WARN_ON(!old_ctx))
1047 if (WARN_ON(new_ctx->replace_state ==
1048 IEEE80211_CHANCTX_REPLACES_OTHER))
1051 chandef = ieee80211_chanctx_non_reserved_chandef(local, new_ctx,
1052 &sdata->reserved_chandef);
1053 if (WARN_ON(!chandef))
1056 vif_chsw[0].vif = &sdata->vif;
1057 vif_chsw[0].old_ctx = &old_ctx->conf;
1058 vif_chsw[0].new_ctx = &new_ctx->conf;
1060 list_del(&sdata->reserved_chanctx_list);
1061 sdata->reserved_chanctx = NULL;
1063 err = drv_switch_vif_chanctx(local, vif_chsw, 1,
1064 CHANCTX_SWMODE_REASSIGN_VIF);
1066 if (ieee80211_chanctx_refcount(local, new_ctx) == 0)
1067 ieee80211_free_chanctx(local, new_ctx);
1072 list_move(&sdata->assigned_chanctx_list, &new_ctx->assigned_vifs);
1073 rcu_assign_pointer(sdata->vif.chanctx_conf, &new_ctx->conf);
1075 if (sdata->vif.type == NL80211_IFTYPE_AP)
1076 __ieee80211_vif_copy_chanctx_to_vlans(sdata, false);
1078 if (ieee80211_chanctx_refcount(local, old_ctx) == 0)
1079 ieee80211_free_chanctx(local, old_ctx);
1081 if (sdata->vif.bss_conf.chandef.width != sdata->reserved_chandef.width)
1082 changed = BSS_CHANGED_BANDWIDTH;
1084 sdata->vif.bss_conf.chandef = sdata->reserved_chandef;
1087 ieee80211_bss_info_change_notify(sdata, changed);
1090 ieee80211_vif_chanctx_reservation_complete(sdata);
1095 ieee80211_vif_use_reserved_assign(struct ieee80211_sub_if_data *sdata)
1097 struct ieee80211_local *local = sdata->local;
1098 struct ieee80211_chanctx *old_ctx, *new_ctx;
1099 const struct cfg80211_chan_def *chandef;
1102 old_ctx = ieee80211_vif_get_chanctx(sdata);
1103 new_ctx = sdata->reserved_chanctx;
1105 if (WARN_ON(!sdata->reserved_ready))
1108 if (WARN_ON(old_ctx))
1111 if (WARN_ON(!new_ctx))
1114 if (WARN_ON(new_ctx->replace_state ==
1115 IEEE80211_CHANCTX_REPLACES_OTHER))
1118 chandef = ieee80211_chanctx_non_reserved_chandef(local, new_ctx,
1119 &sdata->reserved_chandef);
1120 if (WARN_ON(!chandef))
1123 list_del(&sdata->reserved_chanctx_list);
1124 sdata->reserved_chanctx = NULL;
1126 err = ieee80211_assign_vif_chanctx(sdata, new_ctx);
1128 if (ieee80211_chanctx_refcount(local, new_ctx) == 0)
1129 ieee80211_free_chanctx(local, new_ctx);
1135 ieee80211_vif_chanctx_reservation_complete(sdata);
1140 ieee80211_vif_has_in_place_reservation(struct ieee80211_sub_if_data *sdata)
1142 struct ieee80211_chanctx *old_ctx, *new_ctx;
1144 lockdep_assert_held(&sdata->local->chanctx_mtx);
1146 new_ctx = sdata->reserved_chanctx;
1147 old_ctx = ieee80211_vif_get_chanctx(sdata);
1152 if (WARN_ON(!new_ctx))
1155 if (old_ctx->replace_state != IEEE80211_CHANCTX_WILL_BE_REPLACED)
1158 if (new_ctx->replace_state != IEEE80211_CHANCTX_REPLACES_OTHER)
1164 static int ieee80211_chsw_switch_hwconf(struct ieee80211_local *local,
1165 struct ieee80211_chanctx *new_ctx)
1167 const struct cfg80211_chan_def *chandef;
1169 lockdep_assert_held(&local->mtx);
1170 lockdep_assert_held(&local->chanctx_mtx);
1172 chandef = ieee80211_chanctx_reserved_chandef(local, new_ctx, NULL);
1173 if (WARN_ON(!chandef))
1176 local->hw.conf.radar_enabled = new_ctx->conf.radar_enabled;
1177 local->_oper_chandef = *chandef;
1178 ieee80211_hw_config(local, 0);
1183 static int ieee80211_chsw_switch_vifs(struct ieee80211_local *local,
1186 struct ieee80211_vif_chanctx_switch *vif_chsw;
1187 struct ieee80211_sub_if_data *sdata;
1188 struct ieee80211_chanctx *ctx, *old_ctx;
1191 lockdep_assert_held(&local->mtx);
1192 lockdep_assert_held(&local->chanctx_mtx);
1194 vif_chsw = kzalloc(sizeof(vif_chsw[0]) * n_vifs, GFP_KERNEL);
1199 list_for_each_entry(ctx, &local->chanctx_list, list) {
1200 if (ctx->replace_state != IEEE80211_CHANCTX_REPLACES_OTHER)
1203 if (WARN_ON(!ctx->replace_ctx)) {
1208 list_for_each_entry(sdata, &ctx->reserved_vifs,
1209 reserved_chanctx_list) {
1210 if (!ieee80211_vif_has_in_place_reservation(
1214 old_ctx = ieee80211_vif_get_chanctx(sdata);
1215 vif_chsw[i].vif = &sdata->vif;
1216 vif_chsw[i].old_ctx = &old_ctx->conf;
1217 vif_chsw[i].new_ctx = &ctx->conf;
1223 err = drv_switch_vif_chanctx(local, vif_chsw, n_vifs,
1224 CHANCTX_SWMODE_SWAP_CONTEXTS);
1231 static int ieee80211_chsw_switch_ctxs(struct ieee80211_local *local)
1233 struct ieee80211_chanctx *ctx;
1236 lockdep_assert_held(&local->mtx);
1237 lockdep_assert_held(&local->chanctx_mtx);
1239 list_for_each_entry(ctx, &local->chanctx_list, list) {
1240 if (ctx->replace_state != IEEE80211_CHANCTX_REPLACES_OTHER)
1243 if (!list_empty(&ctx->replace_ctx->assigned_vifs))
1246 ieee80211_del_chanctx(local, ctx->replace_ctx);
1247 err = ieee80211_add_chanctx(local, ctx);
1255 WARN_ON(ieee80211_add_chanctx(local, ctx));
1256 list_for_each_entry_continue_reverse(ctx, &local->chanctx_list, list) {
1257 if (ctx->replace_state != IEEE80211_CHANCTX_REPLACES_OTHER)
1260 if (!list_empty(&ctx->replace_ctx->assigned_vifs))
1263 ieee80211_del_chanctx(local, ctx);
1264 WARN_ON(ieee80211_add_chanctx(local, ctx->replace_ctx));
1271 ieee80211_vif_use_reserved_switch(struct ieee80211_local *local)
1273 struct ieee80211_sub_if_data *sdata, *sdata_tmp;
1274 struct ieee80211_chanctx *ctx, *ctx_tmp, *old_ctx;
1275 struct ieee80211_chanctx *new_ctx = NULL;
1276 int i, err, n_assigned, n_reserved, n_ready;
1277 int n_ctx = 0, n_vifs_switch = 0, n_vifs_assign = 0, n_vifs_ctxless = 0;
1279 lockdep_assert_held(&local->mtx);
1280 lockdep_assert_held(&local->chanctx_mtx);
1283 * If there are 2 independent pairs of channel contexts performing
1284 * cross-switch of their vifs this code will still wait until both are
1285 * ready even though it could be possible to switch one before the
1288 * For practical reasons and code simplicity just do a single huge
1293 * Verify if the reservation is still feasible.
1294 * - if it's not then disconnect
1295 * - if it is but not all vifs necessary are ready then defer
1298 list_for_each_entry(ctx, &local->chanctx_list, list) {
1299 if (ctx->replace_state != IEEE80211_CHANCTX_REPLACES_OTHER)
1302 if (WARN_ON(!ctx->replace_ctx)) {
1307 if (!local->use_chanctx)
1316 list_for_each_entry(sdata, &ctx->replace_ctx->assigned_vifs,
1317 assigned_chanctx_list) {
1319 if (sdata->reserved_chanctx) {
1321 if (sdata->reserved_ready)
1326 if (n_assigned != n_reserved) {
1327 if (n_ready == n_reserved) {
1328 wiphy_info(local->hw.wiphy,
1329 "channel context reservation cannot be finalized because some interfaces aren't switching\n");
1337 ctx->conf.radar_enabled = false;
1338 list_for_each_entry(sdata, &ctx->reserved_vifs,
1339 reserved_chanctx_list) {
1340 if (ieee80211_vif_has_in_place_reservation(sdata) &&
1341 !sdata->reserved_ready)
1344 old_ctx = ieee80211_vif_get_chanctx(sdata);
1346 if (old_ctx->replace_state ==
1347 IEEE80211_CHANCTX_WILL_BE_REPLACED)
1355 if (sdata->reserved_radar_required)
1356 ctx->conf.radar_enabled = true;
1360 if (WARN_ON(n_ctx == 0) ||
1361 WARN_ON(n_vifs_switch == 0 &&
1362 n_vifs_assign == 0 &&
1363 n_vifs_ctxless == 0) ||
1364 WARN_ON(n_ctx > 1 && !local->use_chanctx) ||
1365 WARN_ON(!new_ctx && !local->use_chanctx)) {
1371 * All necessary vifs are ready. Perform the switch now depending on
1372 * reservations and driver capabilities.
1375 if (local->use_chanctx) {
1376 if (n_vifs_switch > 0) {
1377 err = ieee80211_chsw_switch_vifs(local, n_vifs_switch);
1382 if (n_vifs_assign > 0 || n_vifs_ctxless > 0) {
1383 err = ieee80211_chsw_switch_ctxs(local);
1388 err = ieee80211_chsw_switch_hwconf(local, new_ctx);
1394 * Update all structures, values and pointers to point to new channel
1399 list_for_each_entry(ctx, &local->chanctx_list, list) {
1400 if (ctx->replace_state != IEEE80211_CHANCTX_REPLACES_OTHER)
1403 if (WARN_ON(!ctx->replace_ctx)) {
1408 list_for_each_entry(sdata, &ctx->reserved_vifs,
1409 reserved_chanctx_list) {
1412 if (!ieee80211_vif_has_in_place_reservation(sdata))
1415 rcu_assign_pointer(sdata->vif.chanctx_conf, &ctx->conf);
1417 if (sdata->vif.type == NL80211_IFTYPE_AP)
1418 __ieee80211_vif_copy_chanctx_to_vlans(sdata,
1421 sdata->radar_required = sdata->reserved_radar_required;
1423 if (sdata->vif.bss_conf.chandef.width !=
1424 sdata->reserved_chandef.width)
1425 changed = BSS_CHANGED_BANDWIDTH;
1427 sdata->vif.bss_conf.chandef = sdata->reserved_chandef;
1429 ieee80211_bss_info_change_notify(sdata,
1432 ieee80211_recalc_txpower(sdata);
1435 ieee80211_recalc_chanctx_chantype(local, ctx);
1436 ieee80211_recalc_smps_chanctx(local, ctx);
1437 ieee80211_recalc_radar_chanctx(local, ctx);
1438 ieee80211_recalc_chanctx_min_def(local, ctx);
1440 list_for_each_entry_safe(sdata, sdata_tmp, &ctx->reserved_vifs,
1441 reserved_chanctx_list) {
1442 if (ieee80211_vif_get_chanctx(sdata) != ctx)
1445 list_del(&sdata->reserved_chanctx_list);
1446 list_move(&sdata->assigned_chanctx_list,
1447 &new_ctx->assigned_vifs);
1448 sdata->reserved_chanctx = NULL;
1450 ieee80211_vif_chanctx_reservation_complete(sdata);
1454 * This context might have been a dependency for an already
1455 * ready re-assign reservation interface that was deferred. Do
1456 * not propagate error to the caller though. The in-place
1457 * reservation for originally requested interface has already
1458 * succeeded at this point.
1460 list_for_each_entry_safe(sdata, sdata_tmp, &ctx->reserved_vifs,
1461 reserved_chanctx_list) {
1462 if (WARN_ON(ieee80211_vif_has_in_place_reservation(
1466 if (WARN_ON(sdata->reserved_chanctx != ctx))
1469 if (!sdata->reserved_ready)
1472 if (ieee80211_vif_get_chanctx(sdata))
1473 err = ieee80211_vif_use_reserved_reassign(
1476 err = ieee80211_vif_use_reserved_assign(sdata);
1480 "failed to finalize (re-)assign reservation (err=%d)\n",
1482 ieee80211_vif_unreserve_chanctx(sdata);
1483 cfg80211_stop_iface(local->hw.wiphy,
1491 * Finally free old contexts
1494 list_for_each_entry_safe(ctx, ctx_tmp, &local->chanctx_list, list) {
1495 if (ctx->replace_state != IEEE80211_CHANCTX_WILL_BE_REPLACED)
1498 ctx->replace_ctx->replace_ctx = NULL;
1499 ctx->replace_ctx->replace_state =
1500 IEEE80211_CHANCTX_REPLACE_NONE;
1502 list_del_rcu(&ctx->list);
1503 kfree_rcu(ctx, rcu_head);
1509 list_for_each_entry(ctx, &local->chanctx_list, list) {
1510 if (ctx->replace_state != IEEE80211_CHANCTX_REPLACES_OTHER)
1513 list_for_each_entry_safe(sdata, sdata_tmp, &ctx->reserved_vifs,
1514 reserved_chanctx_list) {
1515 ieee80211_vif_unreserve_chanctx(sdata);
1516 ieee80211_vif_chanctx_reservation_complete(sdata);
1523 int ieee80211_vif_use_reserved_context(struct ieee80211_sub_if_data *sdata)
1525 struct ieee80211_local *local = sdata->local;
1526 struct ieee80211_chanctx *new_ctx;
1527 struct ieee80211_chanctx *old_ctx;
1530 lockdep_assert_held(&local->mtx);
1531 lockdep_assert_held(&local->chanctx_mtx);
1533 new_ctx = sdata->reserved_chanctx;
1534 old_ctx = ieee80211_vif_get_chanctx(sdata);
1536 if (WARN_ON(!new_ctx))
1539 if (WARN_ON(new_ctx->replace_state ==
1540 IEEE80211_CHANCTX_WILL_BE_REPLACED))
1543 if (WARN_ON(sdata->reserved_ready))
1546 sdata->reserved_ready = true;
1548 if (new_ctx->replace_state == IEEE80211_CHANCTX_REPLACE_NONE) {
1550 err = ieee80211_vif_use_reserved_reassign(sdata);
1552 err = ieee80211_vif_use_reserved_assign(sdata);
1559 * In-place reservation may need to be finalized now either if:
1560 * a) sdata is taking part in the swapping itself and is the last one
1561 * b) sdata has switched with a re-assign reservation to an existing
1562 * context readying in-place switching of old_ctx
1564 * In case of (b) do not propagate the error up because the requested
1565 * sdata already switched successfully. Just spill an extra warning.
1566 * The ieee80211_vif_use_reserved_switch() already stops all necessary
1567 * interfaces upon failure.
1570 old_ctx->replace_state == IEEE80211_CHANCTX_WILL_BE_REPLACED) ||
1571 new_ctx->replace_state == IEEE80211_CHANCTX_REPLACES_OTHER) {
1572 err = ieee80211_vif_use_reserved_switch(local);
1573 if (err && err != -EAGAIN) {
1574 if (new_ctx->replace_state ==
1575 IEEE80211_CHANCTX_REPLACES_OTHER)
1578 wiphy_info(local->hw.wiphy,
1579 "depending in-place reservation failed (err=%d)\n",
1587 int ieee80211_vif_change_bandwidth(struct ieee80211_sub_if_data *sdata,
1588 const struct cfg80211_chan_def *chandef,
1591 struct ieee80211_local *local = sdata->local;
1592 struct ieee80211_chanctx_conf *conf;
1593 struct ieee80211_chanctx *ctx;
1594 const struct cfg80211_chan_def *compat;
1597 if (!cfg80211_chandef_usable(sdata->local->hw.wiphy, chandef,
1598 IEEE80211_CHAN_DISABLED))
1601 mutex_lock(&local->chanctx_mtx);
1602 if (cfg80211_chandef_identical(chandef, &sdata->vif.bss_conf.chandef)) {
1607 if (chandef->width == NL80211_CHAN_WIDTH_20_NOHT ||
1608 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_20_NOHT) {
1613 conf = rcu_dereference_protected(sdata->vif.chanctx_conf,
1614 lockdep_is_held(&local->chanctx_mtx));
1620 ctx = container_of(conf, struct ieee80211_chanctx, conf);
1622 compat = cfg80211_chandef_compatible(&conf->def, chandef);
1628 switch (ctx->replace_state) {
1629 case IEEE80211_CHANCTX_REPLACE_NONE:
1630 if (!ieee80211_chanctx_reserved_chandef(local, ctx, compat)) {
1635 case IEEE80211_CHANCTX_WILL_BE_REPLACED:
1636 /* TODO: Perhaps the bandwith change could be treated as a
1637 * reservation itself? */
1640 case IEEE80211_CHANCTX_REPLACES_OTHER:
1641 /* channel context that is going to replace another channel
1642 * context doesn't really exist and shouldn't be assigned
1648 sdata->vif.bss_conf.chandef = *chandef;
1650 ieee80211_recalc_chanctx_chantype(local, ctx);
1652 *changed |= BSS_CHANGED_BANDWIDTH;
1655 mutex_unlock(&local->chanctx_mtx);
1659 void ieee80211_vif_release_channel(struct ieee80211_sub_if_data *sdata)
1661 WARN_ON(sdata->dev && netif_carrier_ok(sdata->dev));
1663 lockdep_assert_held(&sdata->local->mtx);
1665 mutex_lock(&sdata->local->chanctx_mtx);
1666 __ieee80211_vif_release_channel(sdata);
1667 mutex_unlock(&sdata->local->chanctx_mtx);
1670 void ieee80211_vif_vlan_copy_chanctx(struct ieee80211_sub_if_data *sdata)
1672 struct ieee80211_local *local = sdata->local;
1673 struct ieee80211_sub_if_data *ap;
1674 struct ieee80211_chanctx_conf *conf;
1676 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_AP_VLAN || !sdata->bss))
1679 ap = container_of(sdata->bss, struct ieee80211_sub_if_data, u.ap);
1681 mutex_lock(&local->chanctx_mtx);
1683 conf = rcu_dereference_protected(ap->vif.chanctx_conf,
1684 lockdep_is_held(&local->chanctx_mtx));
1685 rcu_assign_pointer(sdata->vif.chanctx_conf, conf);
1686 mutex_unlock(&local->chanctx_mtx);
1689 void ieee80211_iter_chan_contexts_atomic(
1690 struct ieee80211_hw *hw,
1691 void (*iter)(struct ieee80211_hw *hw,
1692 struct ieee80211_chanctx_conf *chanctx_conf,
1696 struct ieee80211_local *local = hw_to_local(hw);
1697 struct ieee80211_chanctx *ctx;
1700 list_for_each_entry_rcu(ctx, &local->chanctx_list, list)
1701 if (ctx->driver_present)
1702 iter(hw, &ctx->conf, iter_data);
1705 EXPORT_SYMBOL_GPL(ieee80211_iter_chan_contexts_atomic);