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 __maybe_unused = 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 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))
234 if (!sta->uploaded || !test_sta_flag(sta, WLAN_STA_ASSOC))
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_STATION:
269 * The ap's sta->bandwidth is not set yet at this
270 * point, so take the width from the chandef, but
271 * account also for TDLS peers
273 width = max(vif->bss_conf.chandef.width,
274 ieee80211_get_max_required_bw(sdata));
276 case NL80211_IFTYPE_P2P_DEVICE:
278 case NL80211_IFTYPE_ADHOC:
279 case NL80211_IFTYPE_WDS:
280 case NL80211_IFTYPE_MESH_POINT:
281 case NL80211_IFTYPE_OCB:
282 width = vif->bss_conf.chandef.width;
284 case NL80211_IFTYPE_UNSPECIFIED:
285 case NUM_NL80211_IFTYPES:
286 case NL80211_IFTYPE_MONITOR:
287 case NL80211_IFTYPE_P2P_CLIENT:
288 case NL80211_IFTYPE_P2P_GO:
291 max_bw = max(max_bw, width);
294 /* use the configured bandwidth in case of monitor interface */
295 sdata = rcu_dereference(local->monitor_sdata);
296 if (sdata && rcu_access_pointer(sdata->vif.chanctx_conf) == conf)
297 max_bw = max(max_bw, conf->def.width);
305 * recalc the min required chan width of the channel context, which is
306 * the max of min required widths of all the interfaces bound to this
309 void ieee80211_recalc_chanctx_min_def(struct ieee80211_local *local,
310 struct ieee80211_chanctx *ctx)
312 enum nl80211_chan_width max_bw;
313 struct cfg80211_chan_def min_def;
315 lockdep_assert_held(&local->chanctx_mtx);
317 /* don't optimize 5MHz, 10MHz, and radar_enabled confs */
318 if (ctx->conf.def.width == NL80211_CHAN_WIDTH_5 ||
319 ctx->conf.def.width == NL80211_CHAN_WIDTH_10 ||
320 ctx->conf.radar_enabled) {
321 ctx->conf.min_def = ctx->conf.def;
325 max_bw = ieee80211_get_chanctx_max_required_bw(local, &ctx->conf);
327 /* downgrade chandef up to max_bw */
328 min_def = ctx->conf.def;
329 while (min_def.width > max_bw)
330 ieee80211_chandef_downgrade(&min_def);
332 if (cfg80211_chandef_identical(&ctx->conf.min_def, &min_def))
335 ctx->conf.min_def = min_def;
336 if (!ctx->driver_present)
339 drv_change_chanctx(local, ctx, IEEE80211_CHANCTX_CHANGE_MIN_WIDTH);
342 static void ieee80211_change_chanctx(struct ieee80211_local *local,
343 struct ieee80211_chanctx *ctx,
344 const struct cfg80211_chan_def *chandef)
346 if (cfg80211_chandef_identical(&ctx->conf.def, chandef))
349 WARN_ON(!cfg80211_chandef_compatible(&ctx->conf.def, chandef));
351 ctx->conf.def = *chandef;
352 drv_change_chanctx(local, ctx, IEEE80211_CHANCTX_CHANGE_WIDTH);
353 ieee80211_recalc_chanctx_min_def(local, ctx);
355 if (!local->use_chanctx) {
356 local->_oper_chandef = *chandef;
357 ieee80211_hw_config(local, 0);
361 static struct ieee80211_chanctx *
362 ieee80211_find_chanctx(struct ieee80211_local *local,
363 const struct cfg80211_chan_def *chandef,
364 enum ieee80211_chanctx_mode mode)
366 struct ieee80211_chanctx *ctx;
368 lockdep_assert_held(&local->chanctx_mtx);
370 if (mode == IEEE80211_CHANCTX_EXCLUSIVE)
373 list_for_each_entry(ctx, &local->chanctx_list, list) {
374 const struct cfg80211_chan_def *compat;
376 if (ctx->replace_state != IEEE80211_CHANCTX_REPLACE_NONE)
379 if (ctx->mode == IEEE80211_CHANCTX_EXCLUSIVE)
382 compat = cfg80211_chandef_compatible(&ctx->conf.def, chandef);
386 compat = ieee80211_chanctx_reserved_chandef(local, ctx,
391 ieee80211_change_chanctx(local, ctx, compat);
399 bool ieee80211_is_radar_required(struct ieee80211_local *local)
401 struct ieee80211_sub_if_data *sdata;
403 lockdep_assert_held(&local->mtx);
406 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
407 if (sdata->radar_required) {
418 ieee80211_chanctx_radar_required(struct ieee80211_local *local,
419 struct ieee80211_chanctx *ctx)
421 struct ieee80211_chanctx_conf *conf = &ctx->conf;
422 struct ieee80211_sub_if_data *sdata;
423 bool required = false;
425 lockdep_assert_held(&local->chanctx_mtx);
426 lockdep_assert_held(&local->mtx);
429 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
430 if (!ieee80211_sdata_running(sdata))
432 if (rcu_access_pointer(sdata->vif.chanctx_conf) != conf)
434 if (!sdata->radar_required)
445 static struct ieee80211_chanctx *
446 ieee80211_alloc_chanctx(struct ieee80211_local *local,
447 const struct cfg80211_chan_def *chandef,
448 enum ieee80211_chanctx_mode mode)
450 struct ieee80211_chanctx *ctx;
452 lockdep_assert_held(&local->chanctx_mtx);
454 ctx = kzalloc(sizeof(*ctx) + local->hw.chanctx_data_size, GFP_KERNEL);
458 INIT_LIST_HEAD(&ctx->assigned_vifs);
459 INIT_LIST_HEAD(&ctx->reserved_vifs);
460 ctx->conf.def = *chandef;
461 ctx->conf.rx_chains_static = 1;
462 ctx->conf.rx_chains_dynamic = 1;
464 ctx->conf.radar_enabled = false;
465 ieee80211_recalc_chanctx_min_def(local, ctx);
470 static int ieee80211_add_chanctx(struct ieee80211_local *local,
471 struct ieee80211_chanctx *ctx)
476 lockdep_assert_held(&local->mtx);
477 lockdep_assert_held(&local->chanctx_mtx);
479 if (!local->use_chanctx)
480 local->hw.conf.radar_enabled = ctx->conf.radar_enabled;
482 /* turn idle off *before* setting channel -- some drivers need that */
483 changed = ieee80211_idle_off(local);
485 ieee80211_hw_config(local, changed);
487 if (!local->use_chanctx) {
488 local->_oper_chandef = ctx->conf.def;
489 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL);
491 err = drv_add_chanctx(local, ctx);
493 ieee80211_recalc_idle(local);
501 static struct ieee80211_chanctx *
502 ieee80211_new_chanctx(struct ieee80211_local *local,
503 const struct cfg80211_chan_def *chandef,
504 enum ieee80211_chanctx_mode mode)
506 struct ieee80211_chanctx *ctx;
509 lockdep_assert_held(&local->mtx);
510 lockdep_assert_held(&local->chanctx_mtx);
512 ctx = ieee80211_alloc_chanctx(local, chandef, mode);
514 return ERR_PTR(-ENOMEM);
516 err = ieee80211_add_chanctx(local, ctx);
522 list_add_rcu(&ctx->list, &local->chanctx_list);
526 static void ieee80211_del_chanctx(struct ieee80211_local *local,
527 struct ieee80211_chanctx *ctx)
529 lockdep_assert_held(&local->chanctx_mtx);
531 if (!local->use_chanctx) {
532 struct cfg80211_chan_def *chandef = &local->_oper_chandef;
533 chandef->width = NL80211_CHAN_WIDTH_20_NOHT;
534 chandef->center_freq1 = chandef->chan->center_freq;
535 chandef->center_freq2 = 0;
537 /* NOTE: Disabling radar is only valid here for
538 * single channel context. To be sure, check it ...
540 WARN_ON(local->hw.conf.radar_enabled &&
541 !list_empty(&local->chanctx_list));
543 local->hw.conf.radar_enabled = false;
545 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL);
547 drv_remove_chanctx(local, ctx);
550 ieee80211_recalc_idle(local);
553 static void ieee80211_free_chanctx(struct ieee80211_local *local,
554 struct ieee80211_chanctx *ctx)
556 lockdep_assert_held(&local->chanctx_mtx);
558 WARN_ON_ONCE(ieee80211_chanctx_refcount(local, ctx) != 0);
560 list_del_rcu(&ctx->list);
561 ieee80211_del_chanctx(local, ctx);
562 kfree_rcu(ctx, rcu_head);
565 void ieee80211_recalc_chanctx_chantype(struct ieee80211_local *local,
566 struct ieee80211_chanctx *ctx)
568 struct ieee80211_chanctx_conf *conf = &ctx->conf;
569 struct ieee80211_sub_if_data *sdata;
570 const struct cfg80211_chan_def *compat = NULL;
571 struct sta_info *sta;
573 lockdep_assert_held(&local->chanctx_mtx);
576 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
578 if (!ieee80211_sdata_running(sdata))
580 if (rcu_access_pointer(sdata->vif.chanctx_conf) != conf)
582 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
586 compat = &sdata->vif.bss_conf.chandef;
588 compat = cfg80211_chandef_compatible(
589 &sdata->vif.bss_conf.chandef, compat);
590 if (WARN_ON_ONCE(!compat))
594 /* TDLS peers can sometimes affect the chandef width */
595 list_for_each_entry_rcu(sta, &local->sta_list, list) {
596 if (!sta->uploaded ||
597 !test_sta_flag(sta, WLAN_STA_TDLS_WIDER_BW) ||
598 !test_sta_flag(sta, WLAN_STA_AUTHORIZED) ||
599 !sta->tdls_chandef.chan)
602 compat = cfg80211_chandef_compatible(&sta->tdls_chandef,
604 if (WARN_ON_ONCE(!compat))
612 ieee80211_change_chanctx(local, ctx, compat);
615 static void ieee80211_recalc_radar_chanctx(struct ieee80211_local *local,
616 struct ieee80211_chanctx *chanctx)
620 lockdep_assert_held(&local->chanctx_mtx);
621 /* for ieee80211_is_radar_required */
622 lockdep_assert_held(&local->mtx);
624 radar_enabled = ieee80211_chanctx_radar_required(local, chanctx);
626 if (radar_enabled == chanctx->conf.radar_enabled)
629 chanctx->conf.radar_enabled = radar_enabled;
631 if (!local->use_chanctx) {
632 local->hw.conf.radar_enabled = chanctx->conf.radar_enabled;
633 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL);
636 drv_change_chanctx(local, chanctx, IEEE80211_CHANCTX_CHANGE_RADAR);
639 static int ieee80211_assign_vif_chanctx(struct ieee80211_sub_if_data *sdata,
640 struct ieee80211_chanctx *new_ctx)
642 struct ieee80211_local *local = sdata->local;
643 struct ieee80211_chanctx_conf *conf;
644 struct ieee80211_chanctx *curr_ctx = NULL;
647 conf = rcu_dereference_protected(sdata->vif.chanctx_conf,
648 lockdep_is_held(&local->chanctx_mtx));
651 curr_ctx = container_of(conf, struct ieee80211_chanctx, conf);
653 drv_unassign_vif_chanctx(local, sdata, curr_ctx);
655 list_del(&sdata->assigned_chanctx_list);
659 ret = drv_assign_vif_chanctx(local, sdata, new_ctx);
663 conf = &new_ctx->conf;
664 list_add(&sdata->assigned_chanctx_list,
665 &new_ctx->assigned_vifs);
669 rcu_assign_pointer(sdata->vif.chanctx_conf, conf);
671 sdata->vif.bss_conf.idle = !conf;
673 if (curr_ctx && ieee80211_chanctx_num_assigned(local, curr_ctx) > 0) {
674 ieee80211_recalc_chanctx_chantype(local, curr_ctx);
675 ieee80211_recalc_smps_chanctx(local, curr_ctx);
676 ieee80211_recalc_radar_chanctx(local, curr_ctx);
677 ieee80211_recalc_chanctx_min_def(local, curr_ctx);
680 if (new_ctx && ieee80211_chanctx_num_assigned(local, new_ctx) > 0) {
681 ieee80211_recalc_txpower(sdata, false);
682 ieee80211_recalc_chanctx_min_def(local, new_ctx);
685 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE &&
686 sdata->vif.type != NL80211_IFTYPE_MONITOR)
687 ieee80211_bss_info_change_notify(sdata,
690 ieee80211_check_fast_xmit_iface(sdata);
695 void ieee80211_recalc_smps_chanctx(struct ieee80211_local *local,
696 struct ieee80211_chanctx *chanctx)
698 struct ieee80211_sub_if_data *sdata;
699 u8 rx_chains_static, rx_chains_dynamic;
701 lockdep_assert_held(&local->chanctx_mtx);
703 rx_chains_static = 1;
704 rx_chains_dynamic = 1;
707 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
708 u8 needed_static, needed_dynamic;
710 if (!ieee80211_sdata_running(sdata))
713 if (rcu_access_pointer(sdata->vif.chanctx_conf) !=
717 switch (sdata->vif.type) {
718 case NL80211_IFTYPE_P2P_DEVICE:
720 case NL80211_IFTYPE_STATION:
721 if (!sdata->u.mgd.associated)
724 case NL80211_IFTYPE_AP_VLAN:
726 case NL80211_IFTYPE_AP:
727 case NL80211_IFTYPE_ADHOC:
728 case NL80211_IFTYPE_WDS:
729 case NL80211_IFTYPE_MESH_POINT:
730 case NL80211_IFTYPE_OCB:
736 switch (sdata->smps_mode) {
738 WARN_ONCE(1, "Invalid SMPS mode %d\n",
741 case IEEE80211_SMPS_OFF:
742 needed_static = sdata->needed_rx_chains;
743 needed_dynamic = sdata->needed_rx_chains;
745 case IEEE80211_SMPS_DYNAMIC:
747 needed_dynamic = sdata->needed_rx_chains;
749 case IEEE80211_SMPS_STATIC:
755 rx_chains_static = max(rx_chains_static, needed_static);
756 rx_chains_dynamic = max(rx_chains_dynamic, needed_dynamic);
759 /* Disable SMPS for the monitor interface */
760 sdata = rcu_dereference(local->monitor_sdata);
762 rcu_access_pointer(sdata->vif.chanctx_conf) == &chanctx->conf)
763 rx_chains_dynamic = rx_chains_static = local->rx_chains;
767 if (!local->use_chanctx) {
768 if (rx_chains_static > 1)
769 local->smps_mode = IEEE80211_SMPS_OFF;
770 else if (rx_chains_dynamic > 1)
771 local->smps_mode = IEEE80211_SMPS_DYNAMIC;
773 local->smps_mode = IEEE80211_SMPS_STATIC;
774 ieee80211_hw_config(local, 0);
777 if (rx_chains_static == chanctx->conf.rx_chains_static &&
778 rx_chains_dynamic == chanctx->conf.rx_chains_dynamic)
781 chanctx->conf.rx_chains_static = rx_chains_static;
782 chanctx->conf.rx_chains_dynamic = rx_chains_dynamic;
783 drv_change_chanctx(local, chanctx, IEEE80211_CHANCTX_CHANGE_RX_CHAINS);
787 __ieee80211_vif_copy_chanctx_to_vlans(struct ieee80211_sub_if_data *sdata,
790 struct ieee80211_local *local __maybe_unused = sdata->local;
791 struct ieee80211_sub_if_data *vlan;
792 struct ieee80211_chanctx_conf *conf;
794 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_AP))
797 lockdep_assert_held(&local->mtx);
799 /* Check that conf exists, even when clearing this function
800 * must be called with the AP's channel context still there
801 * as it would otherwise cause VLANs to have an invalid
802 * channel context pointer for a while, possibly pointing
803 * to a channel context that has already been freed.
805 conf = rcu_dereference_protected(sdata->vif.chanctx_conf,
806 lockdep_is_held(&local->chanctx_mtx));
812 list_for_each_entry(vlan, &sdata->u.ap.vlans, u.vlan.list)
813 rcu_assign_pointer(vlan->vif.chanctx_conf, conf);
816 void ieee80211_vif_copy_chanctx_to_vlans(struct ieee80211_sub_if_data *sdata,
819 struct ieee80211_local *local = sdata->local;
821 mutex_lock(&local->chanctx_mtx);
823 __ieee80211_vif_copy_chanctx_to_vlans(sdata, clear);
825 mutex_unlock(&local->chanctx_mtx);
828 int ieee80211_vif_unreserve_chanctx(struct ieee80211_sub_if_data *sdata)
830 struct ieee80211_chanctx *ctx = sdata->reserved_chanctx;
832 lockdep_assert_held(&sdata->local->chanctx_mtx);
837 list_del(&sdata->reserved_chanctx_list);
838 sdata->reserved_chanctx = NULL;
840 if (ieee80211_chanctx_refcount(sdata->local, ctx) == 0) {
841 if (ctx->replace_state == IEEE80211_CHANCTX_REPLACES_OTHER) {
842 if (WARN_ON(!ctx->replace_ctx))
845 WARN_ON(ctx->replace_ctx->replace_state !=
846 IEEE80211_CHANCTX_WILL_BE_REPLACED);
847 WARN_ON(ctx->replace_ctx->replace_ctx != ctx);
849 ctx->replace_ctx->replace_ctx = NULL;
850 ctx->replace_ctx->replace_state =
851 IEEE80211_CHANCTX_REPLACE_NONE;
853 list_del_rcu(&ctx->list);
854 kfree_rcu(ctx, rcu_head);
856 ieee80211_free_chanctx(sdata->local, ctx);
863 int ieee80211_vif_reserve_chanctx(struct ieee80211_sub_if_data *sdata,
864 const struct cfg80211_chan_def *chandef,
865 enum ieee80211_chanctx_mode mode,
868 struct ieee80211_local *local = sdata->local;
869 struct ieee80211_chanctx *new_ctx, *curr_ctx, *ctx;
871 lockdep_assert_held(&local->chanctx_mtx);
873 curr_ctx = ieee80211_vif_get_chanctx(sdata);
874 if (curr_ctx && local->use_chanctx && !local->ops->switch_vif_chanctx)
877 new_ctx = ieee80211_find_reservation_chanctx(local, chandef, mode);
879 if (ieee80211_can_create_new_chanctx(local)) {
880 new_ctx = ieee80211_new_chanctx(local, chandef, mode);
882 return PTR_ERR(new_ctx);
885 (curr_ctx->replace_state ==
886 IEEE80211_CHANCTX_WILL_BE_REPLACED) ||
887 !list_empty(&curr_ctx->reserved_vifs)) {
889 * Another vif already requested this context
890 * for a reservation. Find another one hoping
891 * all vifs assigned to it will also switch
894 * TODO: This needs a little more work as some
895 * cases (more than 2 chanctx capable devices)
896 * may fail which could otherwise succeed
897 * provided some channel context juggling was
900 * Consider ctx1..3, vif1..6, each ctx has 2
901 * vifs. vif1 and vif2 from ctx1 request new
902 * different chandefs starting 2 in-place
903 * reserations with ctx4 and ctx5 replacing
904 * ctx1 and ctx2 respectively. Next vif5 and
905 * vif6 from ctx3 reserve ctx4. If vif3 and
906 * vif4 remain on ctx2 as they are then this
907 * fails unless `replace_ctx` from ctx5 is
908 * replaced with ctx3.
910 list_for_each_entry(ctx, &local->chanctx_list,
912 if (ctx->replace_state !=
913 IEEE80211_CHANCTX_REPLACE_NONE)
916 if (!list_empty(&ctx->reserved_vifs))
925 * If that's true then all available contexts already
926 * have reservations and cannot be used.
929 (curr_ctx->replace_state ==
930 IEEE80211_CHANCTX_WILL_BE_REPLACED) ||
931 !list_empty(&curr_ctx->reserved_vifs))
934 new_ctx = ieee80211_alloc_chanctx(local, chandef, mode);
938 new_ctx->replace_ctx = curr_ctx;
939 new_ctx->replace_state =
940 IEEE80211_CHANCTX_REPLACES_OTHER;
942 curr_ctx->replace_ctx = new_ctx;
943 curr_ctx->replace_state =
944 IEEE80211_CHANCTX_WILL_BE_REPLACED;
946 list_add_rcu(&new_ctx->list, &local->chanctx_list);
950 list_add(&sdata->reserved_chanctx_list, &new_ctx->reserved_vifs);
951 sdata->reserved_chanctx = new_ctx;
952 sdata->reserved_chandef = *chandef;
953 sdata->reserved_radar_required = radar_required;
954 sdata->reserved_ready = false;
960 ieee80211_vif_chanctx_reservation_complete(struct ieee80211_sub_if_data *sdata)
962 switch (sdata->vif.type) {
963 case NL80211_IFTYPE_ADHOC:
964 case NL80211_IFTYPE_AP:
965 case NL80211_IFTYPE_MESH_POINT:
966 case NL80211_IFTYPE_OCB:
967 ieee80211_queue_work(&sdata->local->hw,
968 &sdata->csa_finalize_work);
970 case NL80211_IFTYPE_STATION:
971 ieee80211_queue_work(&sdata->local->hw,
972 &sdata->u.mgd.chswitch_work);
974 case NL80211_IFTYPE_UNSPECIFIED:
975 case NL80211_IFTYPE_AP_VLAN:
976 case NL80211_IFTYPE_WDS:
977 case NL80211_IFTYPE_MONITOR:
978 case NL80211_IFTYPE_P2P_CLIENT:
979 case NL80211_IFTYPE_P2P_GO:
980 case NL80211_IFTYPE_P2P_DEVICE:
981 case NUM_NL80211_IFTYPES:
988 ieee80211_vif_update_chandef(struct ieee80211_sub_if_data *sdata,
989 const struct cfg80211_chan_def *chandef)
991 struct ieee80211_sub_if_data *vlan;
993 sdata->vif.bss_conf.chandef = *chandef;
995 if (sdata->vif.type != NL80211_IFTYPE_AP)
998 list_for_each_entry(vlan, &sdata->u.ap.vlans, u.vlan.list)
999 vlan->vif.bss_conf.chandef = *chandef;
1003 ieee80211_vif_use_reserved_reassign(struct ieee80211_sub_if_data *sdata)
1005 struct ieee80211_local *local = sdata->local;
1006 struct ieee80211_vif_chanctx_switch vif_chsw[1] = {};
1007 struct ieee80211_chanctx *old_ctx, *new_ctx;
1008 const struct cfg80211_chan_def *chandef;
1012 lockdep_assert_held(&local->mtx);
1013 lockdep_assert_held(&local->chanctx_mtx);
1015 new_ctx = sdata->reserved_chanctx;
1016 old_ctx = ieee80211_vif_get_chanctx(sdata);
1018 if (WARN_ON(!sdata->reserved_ready))
1021 if (WARN_ON(!new_ctx))
1024 if (WARN_ON(!old_ctx))
1027 if (WARN_ON(new_ctx->replace_state ==
1028 IEEE80211_CHANCTX_REPLACES_OTHER))
1031 chandef = ieee80211_chanctx_non_reserved_chandef(local, new_ctx,
1032 &sdata->reserved_chandef);
1033 if (WARN_ON(!chandef))
1036 ieee80211_change_chanctx(local, new_ctx, chandef);
1038 vif_chsw[0].vif = &sdata->vif;
1039 vif_chsw[0].old_ctx = &old_ctx->conf;
1040 vif_chsw[0].new_ctx = &new_ctx->conf;
1042 list_del(&sdata->reserved_chanctx_list);
1043 sdata->reserved_chanctx = NULL;
1045 err = drv_switch_vif_chanctx(local, vif_chsw, 1,
1046 CHANCTX_SWMODE_REASSIGN_VIF);
1048 if (ieee80211_chanctx_refcount(local, new_ctx) == 0)
1049 ieee80211_free_chanctx(local, new_ctx);
1054 list_move(&sdata->assigned_chanctx_list, &new_ctx->assigned_vifs);
1055 rcu_assign_pointer(sdata->vif.chanctx_conf, &new_ctx->conf);
1057 if (sdata->vif.type == NL80211_IFTYPE_AP)
1058 __ieee80211_vif_copy_chanctx_to_vlans(sdata, false);
1060 ieee80211_check_fast_xmit_iface(sdata);
1062 if (ieee80211_chanctx_refcount(local, old_ctx) == 0)
1063 ieee80211_free_chanctx(local, old_ctx);
1065 if (sdata->vif.bss_conf.chandef.width != sdata->reserved_chandef.width)
1066 changed = BSS_CHANGED_BANDWIDTH;
1068 ieee80211_vif_update_chandef(sdata, &sdata->reserved_chandef);
1070 ieee80211_recalc_smps_chanctx(local, new_ctx);
1071 ieee80211_recalc_radar_chanctx(local, new_ctx);
1072 ieee80211_recalc_chanctx_min_def(local, new_ctx);
1075 ieee80211_bss_info_change_notify(sdata, changed);
1078 ieee80211_vif_chanctx_reservation_complete(sdata);
1083 ieee80211_vif_use_reserved_assign(struct ieee80211_sub_if_data *sdata)
1085 struct ieee80211_local *local = sdata->local;
1086 struct ieee80211_chanctx *old_ctx, *new_ctx;
1087 const struct cfg80211_chan_def *chandef;
1090 old_ctx = ieee80211_vif_get_chanctx(sdata);
1091 new_ctx = sdata->reserved_chanctx;
1093 if (WARN_ON(!sdata->reserved_ready))
1096 if (WARN_ON(old_ctx))
1099 if (WARN_ON(!new_ctx))
1102 if (WARN_ON(new_ctx->replace_state ==
1103 IEEE80211_CHANCTX_REPLACES_OTHER))
1106 chandef = ieee80211_chanctx_non_reserved_chandef(local, new_ctx,
1107 &sdata->reserved_chandef);
1108 if (WARN_ON(!chandef))
1111 ieee80211_change_chanctx(local, new_ctx, chandef);
1113 list_del(&sdata->reserved_chanctx_list);
1114 sdata->reserved_chanctx = NULL;
1116 err = ieee80211_assign_vif_chanctx(sdata, new_ctx);
1118 if (ieee80211_chanctx_refcount(local, new_ctx) == 0)
1119 ieee80211_free_chanctx(local, new_ctx);
1125 ieee80211_vif_chanctx_reservation_complete(sdata);
1130 ieee80211_vif_has_in_place_reservation(struct ieee80211_sub_if_data *sdata)
1132 struct ieee80211_chanctx *old_ctx, *new_ctx;
1134 lockdep_assert_held(&sdata->local->chanctx_mtx);
1136 new_ctx = sdata->reserved_chanctx;
1137 old_ctx = ieee80211_vif_get_chanctx(sdata);
1142 if (WARN_ON(!new_ctx))
1145 if (old_ctx->replace_state != IEEE80211_CHANCTX_WILL_BE_REPLACED)
1148 if (new_ctx->replace_state != IEEE80211_CHANCTX_REPLACES_OTHER)
1154 static int ieee80211_chsw_switch_hwconf(struct ieee80211_local *local,
1155 struct ieee80211_chanctx *new_ctx)
1157 const struct cfg80211_chan_def *chandef;
1159 lockdep_assert_held(&local->mtx);
1160 lockdep_assert_held(&local->chanctx_mtx);
1162 chandef = ieee80211_chanctx_reserved_chandef(local, new_ctx, NULL);
1163 if (WARN_ON(!chandef))
1166 local->hw.conf.radar_enabled = new_ctx->conf.radar_enabled;
1167 local->_oper_chandef = *chandef;
1168 ieee80211_hw_config(local, 0);
1173 static int ieee80211_chsw_switch_vifs(struct ieee80211_local *local,
1176 struct ieee80211_vif_chanctx_switch *vif_chsw;
1177 struct ieee80211_sub_if_data *sdata;
1178 struct ieee80211_chanctx *ctx, *old_ctx;
1181 lockdep_assert_held(&local->mtx);
1182 lockdep_assert_held(&local->chanctx_mtx);
1184 vif_chsw = kzalloc(sizeof(vif_chsw[0]) * n_vifs, GFP_KERNEL);
1189 list_for_each_entry(ctx, &local->chanctx_list, list) {
1190 if (ctx->replace_state != IEEE80211_CHANCTX_REPLACES_OTHER)
1193 if (WARN_ON(!ctx->replace_ctx)) {
1198 list_for_each_entry(sdata, &ctx->reserved_vifs,
1199 reserved_chanctx_list) {
1200 if (!ieee80211_vif_has_in_place_reservation(
1204 old_ctx = ieee80211_vif_get_chanctx(sdata);
1205 vif_chsw[i].vif = &sdata->vif;
1206 vif_chsw[i].old_ctx = &old_ctx->conf;
1207 vif_chsw[i].new_ctx = &ctx->conf;
1213 err = drv_switch_vif_chanctx(local, vif_chsw, n_vifs,
1214 CHANCTX_SWMODE_SWAP_CONTEXTS);
1221 static int ieee80211_chsw_switch_ctxs(struct ieee80211_local *local)
1223 struct ieee80211_chanctx *ctx;
1226 lockdep_assert_held(&local->mtx);
1227 lockdep_assert_held(&local->chanctx_mtx);
1229 list_for_each_entry(ctx, &local->chanctx_list, list) {
1230 if (ctx->replace_state != IEEE80211_CHANCTX_REPLACES_OTHER)
1233 if (!list_empty(&ctx->replace_ctx->assigned_vifs))
1236 ieee80211_del_chanctx(local, ctx->replace_ctx);
1237 err = ieee80211_add_chanctx(local, ctx);
1245 WARN_ON(ieee80211_add_chanctx(local, ctx));
1246 list_for_each_entry_continue_reverse(ctx, &local->chanctx_list, list) {
1247 if (ctx->replace_state != IEEE80211_CHANCTX_REPLACES_OTHER)
1250 if (!list_empty(&ctx->replace_ctx->assigned_vifs))
1253 ieee80211_del_chanctx(local, ctx);
1254 WARN_ON(ieee80211_add_chanctx(local, ctx->replace_ctx));
1260 static int ieee80211_vif_use_reserved_switch(struct ieee80211_local *local)
1262 struct ieee80211_sub_if_data *sdata, *sdata_tmp;
1263 struct ieee80211_chanctx *ctx, *ctx_tmp, *old_ctx;
1264 struct ieee80211_chanctx *new_ctx = NULL;
1265 int i, err, n_assigned, n_reserved, n_ready;
1266 int n_ctx = 0, n_vifs_switch = 0, n_vifs_assign = 0, n_vifs_ctxless = 0;
1268 lockdep_assert_held(&local->mtx);
1269 lockdep_assert_held(&local->chanctx_mtx);
1272 * If there are 2 independent pairs of channel contexts performing
1273 * cross-switch of their vifs this code will still wait until both are
1274 * ready even though it could be possible to switch one before the
1277 * For practical reasons and code simplicity just do a single huge
1282 * Verify if the reservation is still feasible.
1283 * - if it's not then disconnect
1284 * - if it is but not all vifs necessary are ready then defer
1287 list_for_each_entry(ctx, &local->chanctx_list, list) {
1288 if (ctx->replace_state != IEEE80211_CHANCTX_REPLACES_OTHER)
1291 if (WARN_ON(!ctx->replace_ctx)) {
1296 if (!local->use_chanctx)
1305 list_for_each_entry(sdata, &ctx->replace_ctx->assigned_vifs,
1306 assigned_chanctx_list) {
1308 if (sdata->reserved_chanctx) {
1310 if (sdata->reserved_ready)
1315 if (n_assigned != n_reserved) {
1316 if (n_ready == n_reserved) {
1317 wiphy_info(local->hw.wiphy,
1318 "channel context reservation cannot be finalized because some interfaces aren't switching\n");
1326 ctx->conf.radar_enabled = false;
1327 list_for_each_entry(sdata, &ctx->reserved_vifs,
1328 reserved_chanctx_list) {
1329 if (ieee80211_vif_has_in_place_reservation(sdata) &&
1330 !sdata->reserved_ready)
1333 old_ctx = ieee80211_vif_get_chanctx(sdata);
1335 if (old_ctx->replace_state ==
1336 IEEE80211_CHANCTX_WILL_BE_REPLACED)
1344 if (sdata->reserved_radar_required)
1345 ctx->conf.radar_enabled = true;
1349 if (WARN_ON(n_ctx == 0) ||
1350 WARN_ON(n_vifs_switch == 0 &&
1351 n_vifs_assign == 0 &&
1352 n_vifs_ctxless == 0) ||
1353 WARN_ON(n_ctx > 1 && !local->use_chanctx) ||
1354 WARN_ON(!new_ctx && !local->use_chanctx)) {
1360 * All necessary vifs are ready. Perform the switch now depending on
1361 * reservations and driver capabilities.
1364 if (local->use_chanctx) {
1365 if (n_vifs_switch > 0) {
1366 err = ieee80211_chsw_switch_vifs(local, n_vifs_switch);
1371 if (n_vifs_assign > 0 || n_vifs_ctxless > 0) {
1372 err = ieee80211_chsw_switch_ctxs(local);
1377 err = ieee80211_chsw_switch_hwconf(local, new_ctx);
1383 * Update all structures, values and pointers to point to new channel
1388 list_for_each_entry(ctx, &local->chanctx_list, list) {
1389 if (ctx->replace_state != IEEE80211_CHANCTX_REPLACES_OTHER)
1392 if (WARN_ON(!ctx->replace_ctx)) {
1397 list_for_each_entry(sdata, &ctx->reserved_vifs,
1398 reserved_chanctx_list) {
1401 if (!ieee80211_vif_has_in_place_reservation(sdata))
1404 rcu_assign_pointer(sdata->vif.chanctx_conf, &ctx->conf);
1406 if (sdata->vif.type == NL80211_IFTYPE_AP)
1407 __ieee80211_vif_copy_chanctx_to_vlans(sdata,
1410 ieee80211_check_fast_xmit_iface(sdata);
1412 sdata->radar_required = sdata->reserved_radar_required;
1414 if (sdata->vif.bss_conf.chandef.width !=
1415 sdata->reserved_chandef.width)
1416 changed = BSS_CHANGED_BANDWIDTH;
1418 ieee80211_vif_update_chandef(sdata, &sdata->reserved_chandef);
1420 ieee80211_bss_info_change_notify(sdata,
1423 ieee80211_recalc_txpower(sdata, false);
1426 ieee80211_recalc_chanctx_chantype(local, ctx);
1427 ieee80211_recalc_smps_chanctx(local, ctx);
1428 ieee80211_recalc_radar_chanctx(local, ctx);
1429 ieee80211_recalc_chanctx_min_def(local, ctx);
1431 list_for_each_entry_safe(sdata, sdata_tmp, &ctx->reserved_vifs,
1432 reserved_chanctx_list) {
1433 if (ieee80211_vif_get_chanctx(sdata) != ctx)
1436 list_del(&sdata->reserved_chanctx_list);
1437 list_move(&sdata->assigned_chanctx_list,
1438 &ctx->assigned_vifs);
1439 sdata->reserved_chanctx = NULL;
1441 ieee80211_vif_chanctx_reservation_complete(sdata);
1445 * This context might have been a dependency for an already
1446 * ready re-assign reservation interface that was deferred. Do
1447 * not propagate error to the caller though. The in-place
1448 * reservation for originally requested interface has already
1449 * succeeded at this point.
1451 list_for_each_entry_safe(sdata, sdata_tmp, &ctx->reserved_vifs,
1452 reserved_chanctx_list) {
1453 if (WARN_ON(ieee80211_vif_has_in_place_reservation(
1457 if (WARN_ON(sdata->reserved_chanctx != ctx))
1460 if (!sdata->reserved_ready)
1463 if (ieee80211_vif_get_chanctx(sdata))
1464 err = ieee80211_vif_use_reserved_reassign(
1467 err = ieee80211_vif_use_reserved_assign(sdata);
1471 "failed to finalize (re-)assign reservation (err=%d)\n",
1473 ieee80211_vif_unreserve_chanctx(sdata);
1474 cfg80211_stop_iface(local->hw.wiphy,
1482 * Finally free old contexts
1485 list_for_each_entry_safe(ctx, ctx_tmp, &local->chanctx_list, list) {
1486 if (ctx->replace_state != IEEE80211_CHANCTX_WILL_BE_REPLACED)
1489 ctx->replace_ctx->replace_ctx = NULL;
1490 ctx->replace_ctx->replace_state =
1491 IEEE80211_CHANCTX_REPLACE_NONE;
1493 list_del_rcu(&ctx->list);
1494 kfree_rcu(ctx, rcu_head);
1500 list_for_each_entry(ctx, &local->chanctx_list, list) {
1501 if (ctx->replace_state != IEEE80211_CHANCTX_REPLACES_OTHER)
1504 list_for_each_entry_safe(sdata, sdata_tmp, &ctx->reserved_vifs,
1505 reserved_chanctx_list) {
1506 ieee80211_vif_unreserve_chanctx(sdata);
1507 ieee80211_vif_chanctx_reservation_complete(sdata);
1514 static void __ieee80211_vif_release_channel(struct ieee80211_sub_if_data *sdata)
1516 struct ieee80211_local *local = sdata->local;
1517 struct ieee80211_chanctx_conf *conf;
1518 struct ieee80211_chanctx *ctx;
1519 bool use_reserved_switch = false;
1521 lockdep_assert_held(&local->chanctx_mtx);
1523 conf = rcu_dereference_protected(sdata->vif.chanctx_conf,
1524 lockdep_is_held(&local->chanctx_mtx));
1528 ctx = container_of(conf, struct ieee80211_chanctx, conf);
1530 if (sdata->reserved_chanctx) {
1531 if (sdata->reserved_chanctx->replace_state ==
1532 IEEE80211_CHANCTX_REPLACES_OTHER &&
1533 ieee80211_chanctx_num_reserved(local,
1534 sdata->reserved_chanctx) > 1)
1535 use_reserved_switch = true;
1537 ieee80211_vif_unreserve_chanctx(sdata);
1540 ieee80211_assign_vif_chanctx(sdata, NULL);
1541 if (ieee80211_chanctx_refcount(local, ctx) == 0)
1542 ieee80211_free_chanctx(local, ctx);
1544 sdata->radar_required = false;
1546 /* Unreserving may ready an in-place reservation. */
1547 if (use_reserved_switch)
1548 ieee80211_vif_use_reserved_switch(local);
1551 int ieee80211_vif_use_channel(struct ieee80211_sub_if_data *sdata,
1552 const struct cfg80211_chan_def *chandef,
1553 enum ieee80211_chanctx_mode mode)
1555 struct ieee80211_local *local = sdata->local;
1556 struct ieee80211_chanctx *ctx;
1557 u8 radar_detect_width = 0;
1560 lockdep_assert_held(&local->mtx);
1562 WARN_ON(sdata->dev && netif_carrier_ok(sdata->dev));
1564 mutex_lock(&local->chanctx_mtx);
1566 ret = cfg80211_chandef_dfs_required(local->hw.wiphy,
1568 sdata->wdev.iftype);
1572 radar_detect_width = BIT(chandef->width);
1574 sdata->radar_required = ret;
1576 ret = ieee80211_check_combinations(sdata, chandef, mode,
1577 radar_detect_width);
1581 __ieee80211_vif_release_channel(sdata);
1583 ctx = ieee80211_find_chanctx(local, chandef, mode);
1585 ctx = ieee80211_new_chanctx(local, chandef, mode);
1591 ieee80211_vif_update_chandef(sdata, chandef);
1593 ret = ieee80211_assign_vif_chanctx(sdata, ctx);
1595 /* if assign fails refcount stays the same */
1596 if (ieee80211_chanctx_refcount(local, ctx) == 0)
1597 ieee80211_free_chanctx(local, ctx);
1601 ieee80211_recalc_smps_chanctx(local, ctx);
1602 ieee80211_recalc_radar_chanctx(local, ctx);
1605 sdata->radar_required = false;
1607 mutex_unlock(&local->chanctx_mtx);
1611 int ieee80211_vif_use_reserved_context(struct ieee80211_sub_if_data *sdata)
1613 struct ieee80211_local *local = sdata->local;
1614 struct ieee80211_chanctx *new_ctx;
1615 struct ieee80211_chanctx *old_ctx;
1618 lockdep_assert_held(&local->mtx);
1619 lockdep_assert_held(&local->chanctx_mtx);
1621 new_ctx = sdata->reserved_chanctx;
1622 old_ctx = ieee80211_vif_get_chanctx(sdata);
1624 if (WARN_ON(!new_ctx))
1627 if (WARN_ON(new_ctx->replace_state ==
1628 IEEE80211_CHANCTX_WILL_BE_REPLACED))
1631 if (WARN_ON(sdata->reserved_ready))
1634 sdata->reserved_ready = true;
1636 if (new_ctx->replace_state == IEEE80211_CHANCTX_REPLACE_NONE) {
1638 err = ieee80211_vif_use_reserved_reassign(sdata);
1640 err = ieee80211_vif_use_reserved_assign(sdata);
1647 * In-place reservation may need to be finalized now either if:
1648 * a) sdata is taking part in the swapping itself and is the last one
1649 * b) sdata has switched with a re-assign reservation to an existing
1650 * context readying in-place switching of old_ctx
1652 * In case of (b) do not propagate the error up because the requested
1653 * sdata already switched successfully. Just spill an extra warning.
1654 * The ieee80211_vif_use_reserved_switch() already stops all necessary
1655 * interfaces upon failure.
1658 old_ctx->replace_state == IEEE80211_CHANCTX_WILL_BE_REPLACED) ||
1659 new_ctx->replace_state == IEEE80211_CHANCTX_REPLACES_OTHER) {
1660 err = ieee80211_vif_use_reserved_switch(local);
1661 if (err && err != -EAGAIN) {
1662 if (new_ctx->replace_state ==
1663 IEEE80211_CHANCTX_REPLACES_OTHER)
1666 wiphy_info(local->hw.wiphy,
1667 "depending in-place reservation failed (err=%d)\n",
1675 int ieee80211_vif_change_bandwidth(struct ieee80211_sub_if_data *sdata,
1676 const struct cfg80211_chan_def *chandef,
1679 struct ieee80211_local *local = sdata->local;
1680 struct ieee80211_chanctx_conf *conf;
1681 struct ieee80211_chanctx *ctx;
1682 const struct cfg80211_chan_def *compat;
1685 if (!cfg80211_chandef_usable(sdata->local->hw.wiphy, chandef,
1686 IEEE80211_CHAN_DISABLED))
1689 mutex_lock(&local->chanctx_mtx);
1690 if (cfg80211_chandef_identical(chandef, &sdata->vif.bss_conf.chandef)) {
1695 if (chandef->width == NL80211_CHAN_WIDTH_20_NOHT ||
1696 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_20_NOHT) {
1701 conf = rcu_dereference_protected(sdata->vif.chanctx_conf,
1702 lockdep_is_held(&local->chanctx_mtx));
1708 ctx = container_of(conf, struct ieee80211_chanctx, conf);
1710 compat = cfg80211_chandef_compatible(&conf->def, chandef);
1716 switch (ctx->replace_state) {
1717 case IEEE80211_CHANCTX_REPLACE_NONE:
1718 if (!ieee80211_chanctx_reserved_chandef(local, ctx, compat)) {
1723 case IEEE80211_CHANCTX_WILL_BE_REPLACED:
1724 /* TODO: Perhaps the bandwidth change could be treated as a
1725 * reservation itself? */
1728 case IEEE80211_CHANCTX_REPLACES_OTHER:
1729 /* channel context that is going to replace another channel
1730 * context doesn't really exist and shouldn't be assigned
1736 ieee80211_vif_update_chandef(sdata, chandef);
1738 ieee80211_recalc_chanctx_chantype(local, ctx);
1740 *changed |= BSS_CHANGED_BANDWIDTH;
1743 mutex_unlock(&local->chanctx_mtx);
1747 void ieee80211_vif_release_channel(struct ieee80211_sub_if_data *sdata)
1749 WARN_ON(sdata->dev && netif_carrier_ok(sdata->dev));
1751 lockdep_assert_held(&sdata->local->mtx);
1753 mutex_lock(&sdata->local->chanctx_mtx);
1754 __ieee80211_vif_release_channel(sdata);
1755 mutex_unlock(&sdata->local->chanctx_mtx);
1758 void ieee80211_vif_vlan_copy_chanctx(struct ieee80211_sub_if_data *sdata)
1760 struct ieee80211_local *local = sdata->local;
1761 struct ieee80211_sub_if_data *ap;
1762 struct ieee80211_chanctx_conf *conf;
1764 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_AP_VLAN || !sdata->bss))
1767 ap = container_of(sdata->bss, struct ieee80211_sub_if_data, u.ap);
1769 mutex_lock(&local->chanctx_mtx);
1771 conf = rcu_dereference_protected(ap->vif.chanctx_conf,
1772 lockdep_is_held(&local->chanctx_mtx));
1773 rcu_assign_pointer(sdata->vif.chanctx_conf, conf);
1774 mutex_unlock(&local->chanctx_mtx);
1777 void ieee80211_iter_chan_contexts_atomic(
1778 struct ieee80211_hw *hw,
1779 void (*iter)(struct ieee80211_hw *hw,
1780 struct ieee80211_chanctx_conf *chanctx_conf,
1784 struct ieee80211_local *local = hw_to_local(hw);
1785 struct ieee80211_chanctx *ctx;
1788 list_for_each_entry_rcu(ctx, &local->chanctx_list, list)
1789 if (ctx->driver_present)
1790 iter(hw, &ctx->conf, iter_data);
1793 EXPORT_SYMBOL_GPL(ieee80211_iter_chan_contexts_atomic);