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 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 case NL80211_IFTYPE_OCB:
274 width = vif->bss_conf.chandef.width;
276 case NL80211_IFTYPE_UNSPECIFIED:
277 case NUM_NL80211_IFTYPES:
278 case NL80211_IFTYPE_MONITOR:
279 case NL80211_IFTYPE_P2P_CLIENT:
280 case NL80211_IFTYPE_P2P_GO:
283 max_bw = max(max_bw, width);
286 /* use the configured bandwidth in case of monitor interface */
287 sdata = rcu_dereference(local->monitor_sdata);
288 if (sdata && rcu_access_pointer(sdata->vif.chanctx_conf) == conf)
289 max_bw = max(max_bw, conf->def.width);
297 * recalc the min required chan width of the channel context, which is
298 * the max of min required widths of all the interfaces bound to this
301 void ieee80211_recalc_chanctx_min_def(struct ieee80211_local *local,
302 struct ieee80211_chanctx *ctx)
304 enum nl80211_chan_width max_bw;
305 struct cfg80211_chan_def min_def;
307 lockdep_assert_held(&local->chanctx_mtx);
309 /* don't optimize 5MHz, 10MHz, and radar_enabled confs */
310 if (ctx->conf.def.width == NL80211_CHAN_WIDTH_5 ||
311 ctx->conf.def.width == NL80211_CHAN_WIDTH_10 ||
312 ctx->conf.radar_enabled) {
313 ctx->conf.min_def = ctx->conf.def;
317 max_bw = ieee80211_get_chanctx_max_required_bw(local, &ctx->conf);
319 /* downgrade chandef up to max_bw */
320 min_def = ctx->conf.def;
321 while (min_def.width > max_bw)
322 ieee80211_chandef_downgrade(&min_def);
324 if (cfg80211_chandef_identical(&ctx->conf.min_def, &min_def))
327 ctx->conf.min_def = min_def;
328 if (!ctx->driver_present)
331 drv_change_chanctx(local, ctx, IEEE80211_CHANCTX_CHANGE_MIN_WIDTH);
334 static void ieee80211_change_chanctx(struct ieee80211_local *local,
335 struct ieee80211_chanctx *ctx,
336 const struct cfg80211_chan_def *chandef)
338 if (cfg80211_chandef_identical(&ctx->conf.def, chandef))
341 WARN_ON(!cfg80211_chandef_compatible(&ctx->conf.def, chandef));
343 ctx->conf.def = *chandef;
344 drv_change_chanctx(local, ctx, IEEE80211_CHANCTX_CHANGE_WIDTH);
345 ieee80211_recalc_chanctx_min_def(local, ctx);
347 if (!local->use_chanctx) {
348 local->_oper_chandef = *chandef;
349 ieee80211_hw_config(local, 0);
353 static struct ieee80211_chanctx *
354 ieee80211_find_chanctx(struct ieee80211_local *local,
355 const struct cfg80211_chan_def *chandef,
356 enum ieee80211_chanctx_mode mode)
358 struct ieee80211_chanctx *ctx;
360 lockdep_assert_held(&local->chanctx_mtx);
362 if (mode == IEEE80211_CHANCTX_EXCLUSIVE)
365 list_for_each_entry(ctx, &local->chanctx_list, list) {
366 const struct cfg80211_chan_def *compat;
368 if (ctx->replace_state != IEEE80211_CHANCTX_REPLACE_NONE)
371 if (ctx->mode == IEEE80211_CHANCTX_EXCLUSIVE)
374 compat = cfg80211_chandef_compatible(&ctx->conf.def, chandef);
378 compat = ieee80211_chanctx_reserved_chandef(local, ctx,
383 ieee80211_change_chanctx(local, ctx, compat);
391 static bool ieee80211_is_radar_required(struct ieee80211_local *local)
393 struct ieee80211_sub_if_data *sdata;
395 lockdep_assert_held(&local->mtx);
398 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
399 if (sdata->radar_required) {
409 static struct ieee80211_chanctx *
410 ieee80211_alloc_chanctx(struct ieee80211_local *local,
411 const struct cfg80211_chan_def *chandef,
412 enum ieee80211_chanctx_mode mode)
414 struct ieee80211_chanctx *ctx;
416 lockdep_assert_held(&local->chanctx_mtx);
418 ctx = kzalloc(sizeof(*ctx) + local->hw.chanctx_data_size, GFP_KERNEL);
422 INIT_LIST_HEAD(&ctx->assigned_vifs);
423 INIT_LIST_HEAD(&ctx->reserved_vifs);
424 ctx->conf.def = *chandef;
425 ctx->conf.rx_chains_static = 1;
426 ctx->conf.rx_chains_dynamic = 1;
428 ctx->conf.radar_enabled = ieee80211_is_radar_required(local);
429 ieee80211_recalc_chanctx_min_def(local, ctx);
434 static int ieee80211_add_chanctx(struct ieee80211_local *local,
435 struct ieee80211_chanctx *ctx)
440 lockdep_assert_held(&local->mtx);
441 lockdep_assert_held(&local->chanctx_mtx);
443 if (!local->use_chanctx)
444 local->hw.conf.radar_enabled = ctx->conf.radar_enabled;
446 /* turn idle off *before* setting channel -- some drivers need that */
447 changed = ieee80211_idle_off(local);
449 ieee80211_hw_config(local, changed);
451 if (!local->use_chanctx) {
452 local->_oper_chandef = ctx->conf.def;
453 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL);
455 err = drv_add_chanctx(local, ctx);
457 ieee80211_recalc_idle(local);
465 static struct ieee80211_chanctx *
466 ieee80211_new_chanctx(struct ieee80211_local *local,
467 const struct cfg80211_chan_def *chandef,
468 enum ieee80211_chanctx_mode mode)
470 struct ieee80211_chanctx *ctx;
473 lockdep_assert_held(&local->mtx);
474 lockdep_assert_held(&local->chanctx_mtx);
476 ctx = ieee80211_alloc_chanctx(local, chandef, mode);
478 return ERR_PTR(-ENOMEM);
480 err = ieee80211_add_chanctx(local, ctx);
486 list_add_rcu(&ctx->list, &local->chanctx_list);
490 static void ieee80211_del_chanctx(struct ieee80211_local *local,
491 struct ieee80211_chanctx *ctx)
493 lockdep_assert_held(&local->chanctx_mtx);
495 if (!local->use_chanctx) {
496 struct cfg80211_chan_def *chandef = &local->_oper_chandef;
497 chandef->width = NL80211_CHAN_WIDTH_20_NOHT;
498 chandef->center_freq1 = chandef->chan->center_freq;
499 chandef->center_freq2 = 0;
501 /* NOTE: Disabling radar is only valid here for
502 * single channel context. To be sure, check it ...
504 WARN_ON(local->hw.conf.radar_enabled &&
505 !list_empty(&local->chanctx_list));
507 local->hw.conf.radar_enabled = false;
509 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL);
511 drv_remove_chanctx(local, ctx);
514 ieee80211_recalc_idle(local);
517 static void ieee80211_free_chanctx(struct ieee80211_local *local,
518 struct ieee80211_chanctx *ctx)
520 lockdep_assert_held(&local->chanctx_mtx);
522 WARN_ON_ONCE(ieee80211_chanctx_refcount(local, ctx) != 0);
524 list_del_rcu(&ctx->list);
525 ieee80211_del_chanctx(local, ctx);
526 kfree_rcu(ctx, rcu_head);
529 static void ieee80211_recalc_chanctx_chantype(struct ieee80211_local *local,
530 struct ieee80211_chanctx *ctx)
532 struct ieee80211_chanctx_conf *conf = &ctx->conf;
533 struct ieee80211_sub_if_data *sdata;
534 const struct cfg80211_chan_def *compat = NULL;
536 lockdep_assert_held(&local->chanctx_mtx);
539 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
541 if (!ieee80211_sdata_running(sdata))
543 if (rcu_access_pointer(sdata->vif.chanctx_conf) != conf)
545 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
549 compat = &sdata->vif.bss_conf.chandef;
551 compat = cfg80211_chandef_compatible(
552 &sdata->vif.bss_conf.chandef, compat);
553 if (WARN_ON_ONCE(!compat))
561 ieee80211_change_chanctx(local, ctx, compat);
564 static void ieee80211_recalc_radar_chanctx(struct ieee80211_local *local,
565 struct ieee80211_chanctx *chanctx)
569 lockdep_assert_held(&local->chanctx_mtx);
570 /* for setting local->radar_detect_enabled */
571 lockdep_assert_held(&local->mtx);
573 radar_enabled = ieee80211_is_radar_required(local);
575 if (radar_enabled == chanctx->conf.radar_enabled)
578 chanctx->conf.radar_enabled = radar_enabled;
579 local->radar_detect_enabled = chanctx->conf.radar_enabled;
581 if (!local->use_chanctx) {
582 local->hw.conf.radar_enabled = chanctx->conf.radar_enabled;
583 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL);
586 drv_change_chanctx(local, chanctx, IEEE80211_CHANCTX_CHANGE_RADAR);
589 static int ieee80211_assign_vif_chanctx(struct ieee80211_sub_if_data *sdata,
590 struct ieee80211_chanctx *new_ctx)
592 struct ieee80211_local *local = sdata->local;
593 struct ieee80211_chanctx_conf *conf;
594 struct ieee80211_chanctx *curr_ctx = NULL;
597 conf = rcu_dereference_protected(sdata->vif.chanctx_conf,
598 lockdep_is_held(&local->chanctx_mtx));
601 curr_ctx = container_of(conf, struct ieee80211_chanctx, conf);
603 drv_unassign_vif_chanctx(local, sdata, curr_ctx);
605 list_del(&sdata->assigned_chanctx_list);
609 ret = drv_assign_vif_chanctx(local, sdata, new_ctx);
613 conf = &new_ctx->conf;
614 list_add(&sdata->assigned_chanctx_list,
615 &new_ctx->assigned_vifs);
619 rcu_assign_pointer(sdata->vif.chanctx_conf, conf);
621 sdata->vif.bss_conf.idle = !conf;
623 if (curr_ctx && ieee80211_chanctx_num_assigned(local, curr_ctx) > 0) {
624 ieee80211_recalc_chanctx_chantype(local, curr_ctx);
625 ieee80211_recalc_smps_chanctx(local, curr_ctx);
626 ieee80211_recalc_radar_chanctx(local, curr_ctx);
627 ieee80211_recalc_chanctx_min_def(local, curr_ctx);
630 if (new_ctx && ieee80211_chanctx_num_assigned(local, new_ctx) > 0) {
631 ieee80211_recalc_txpower(sdata);
632 ieee80211_recalc_chanctx_min_def(local, new_ctx);
635 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE &&
636 sdata->vif.type != NL80211_IFTYPE_MONITOR)
637 ieee80211_bss_info_change_notify(sdata,
643 void ieee80211_recalc_smps_chanctx(struct ieee80211_local *local,
644 struct ieee80211_chanctx *chanctx)
646 struct ieee80211_sub_if_data *sdata;
647 u8 rx_chains_static, rx_chains_dynamic;
649 lockdep_assert_held(&local->chanctx_mtx);
651 rx_chains_static = 1;
652 rx_chains_dynamic = 1;
655 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
656 u8 needed_static, needed_dynamic;
658 if (!ieee80211_sdata_running(sdata))
661 if (rcu_access_pointer(sdata->vif.chanctx_conf) !=
665 switch (sdata->vif.type) {
666 case NL80211_IFTYPE_P2P_DEVICE:
668 case NL80211_IFTYPE_STATION:
669 if (!sdata->u.mgd.associated)
672 case NL80211_IFTYPE_AP_VLAN:
674 case NL80211_IFTYPE_AP:
675 case NL80211_IFTYPE_ADHOC:
676 case NL80211_IFTYPE_WDS:
677 case NL80211_IFTYPE_MESH_POINT:
678 case NL80211_IFTYPE_OCB:
684 switch (sdata->smps_mode) {
686 WARN_ONCE(1, "Invalid SMPS mode %d\n",
689 case IEEE80211_SMPS_OFF:
690 needed_static = sdata->needed_rx_chains;
691 needed_dynamic = sdata->needed_rx_chains;
693 case IEEE80211_SMPS_DYNAMIC:
695 needed_dynamic = sdata->needed_rx_chains;
697 case IEEE80211_SMPS_STATIC:
703 rx_chains_static = max(rx_chains_static, needed_static);
704 rx_chains_dynamic = max(rx_chains_dynamic, needed_dynamic);
707 /* Disable SMPS for the monitor interface */
708 sdata = rcu_dereference(local->monitor_sdata);
710 rcu_access_pointer(sdata->vif.chanctx_conf) == &chanctx->conf)
711 rx_chains_dynamic = rx_chains_static = local->rx_chains;
715 if (!local->use_chanctx) {
716 if (rx_chains_static > 1)
717 local->smps_mode = IEEE80211_SMPS_OFF;
718 else if (rx_chains_dynamic > 1)
719 local->smps_mode = IEEE80211_SMPS_DYNAMIC;
721 local->smps_mode = IEEE80211_SMPS_STATIC;
722 ieee80211_hw_config(local, 0);
725 if (rx_chains_static == chanctx->conf.rx_chains_static &&
726 rx_chains_dynamic == chanctx->conf.rx_chains_dynamic)
729 chanctx->conf.rx_chains_static = rx_chains_static;
730 chanctx->conf.rx_chains_dynamic = rx_chains_dynamic;
731 drv_change_chanctx(local, chanctx, IEEE80211_CHANCTX_CHANGE_RX_CHAINS);
735 __ieee80211_vif_copy_chanctx_to_vlans(struct ieee80211_sub_if_data *sdata,
738 struct ieee80211_local *local __maybe_unused = sdata->local;
739 struct ieee80211_sub_if_data *vlan;
740 struct ieee80211_chanctx_conf *conf;
742 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_AP))
745 lockdep_assert_held(&local->mtx);
747 /* Check that conf exists, even when clearing this function
748 * must be called with the AP's channel context still there
749 * as it would otherwise cause VLANs to have an invalid
750 * channel context pointer for a while, possibly pointing
751 * to a channel context that has already been freed.
753 conf = rcu_dereference_protected(sdata->vif.chanctx_conf,
754 lockdep_is_held(&local->chanctx_mtx));
760 list_for_each_entry(vlan, &sdata->u.ap.vlans, u.vlan.list)
761 rcu_assign_pointer(vlan->vif.chanctx_conf, conf);
764 void ieee80211_vif_copy_chanctx_to_vlans(struct ieee80211_sub_if_data *sdata,
767 struct ieee80211_local *local = sdata->local;
769 mutex_lock(&local->chanctx_mtx);
771 __ieee80211_vif_copy_chanctx_to_vlans(sdata, clear);
773 mutex_unlock(&local->chanctx_mtx);
776 int ieee80211_vif_unreserve_chanctx(struct ieee80211_sub_if_data *sdata)
778 struct ieee80211_chanctx *ctx = sdata->reserved_chanctx;
780 lockdep_assert_held(&sdata->local->chanctx_mtx);
785 list_del(&sdata->reserved_chanctx_list);
786 sdata->reserved_chanctx = NULL;
788 if (ieee80211_chanctx_refcount(sdata->local, ctx) == 0) {
789 if (ctx->replace_state == IEEE80211_CHANCTX_REPLACES_OTHER) {
790 if (WARN_ON(!ctx->replace_ctx))
793 WARN_ON(ctx->replace_ctx->replace_state !=
794 IEEE80211_CHANCTX_WILL_BE_REPLACED);
795 WARN_ON(ctx->replace_ctx->replace_ctx != ctx);
797 ctx->replace_ctx->replace_ctx = NULL;
798 ctx->replace_ctx->replace_state =
799 IEEE80211_CHANCTX_REPLACE_NONE;
801 list_del_rcu(&ctx->list);
802 kfree_rcu(ctx, rcu_head);
804 ieee80211_free_chanctx(sdata->local, ctx);
811 int ieee80211_vif_reserve_chanctx(struct ieee80211_sub_if_data *sdata,
812 const struct cfg80211_chan_def *chandef,
813 enum ieee80211_chanctx_mode mode,
816 struct ieee80211_local *local = sdata->local;
817 struct ieee80211_chanctx *new_ctx, *curr_ctx, *ctx;
819 lockdep_assert_held(&local->chanctx_mtx);
821 curr_ctx = ieee80211_vif_get_chanctx(sdata);
822 if (curr_ctx && local->use_chanctx && !local->ops->switch_vif_chanctx)
825 new_ctx = ieee80211_find_reservation_chanctx(local, chandef, mode);
827 if (ieee80211_can_create_new_chanctx(local)) {
828 new_ctx = ieee80211_new_chanctx(local, chandef, mode);
830 return PTR_ERR(new_ctx);
833 (curr_ctx->replace_state ==
834 IEEE80211_CHANCTX_WILL_BE_REPLACED) ||
835 !list_empty(&curr_ctx->reserved_vifs)) {
837 * Another vif already requested this context
838 * for a reservation. Find another one hoping
839 * all vifs assigned to it will also switch
842 * TODO: This needs a little more work as some
843 * cases (more than 2 chanctx capable devices)
844 * may fail which could otherwise succeed
845 * provided some channel context juggling was
848 * Consider ctx1..3, vif1..6, each ctx has 2
849 * vifs. vif1 and vif2 from ctx1 request new
850 * different chandefs starting 2 in-place
851 * reserations with ctx4 and ctx5 replacing
852 * ctx1 and ctx2 respectively. Next vif5 and
853 * vif6 from ctx3 reserve ctx4. If vif3 and
854 * vif4 remain on ctx2 as they are then this
855 * fails unless `replace_ctx` from ctx5 is
856 * replaced with ctx3.
858 list_for_each_entry(ctx, &local->chanctx_list,
860 if (ctx->replace_state !=
861 IEEE80211_CHANCTX_REPLACE_NONE)
864 if (!list_empty(&ctx->reserved_vifs))
873 * If that's true then all available contexts already
874 * have reservations and cannot be used.
877 (curr_ctx->replace_state ==
878 IEEE80211_CHANCTX_WILL_BE_REPLACED) ||
879 !list_empty(&curr_ctx->reserved_vifs))
882 new_ctx = ieee80211_alloc_chanctx(local, chandef, mode);
886 new_ctx->replace_ctx = curr_ctx;
887 new_ctx->replace_state =
888 IEEE80211_CHANCTX_REPLACES_OTHER;
890 curr_ctx->replace_ctx = new_ctx;
891 curr_ctx->replace_state =
892 IEEE80211_CHANCTX_WILL_BE_REPLACED;
894 list_add_rcu(&new_ctx->list, &local->chanctx_list);
898 list_add(&sdata->reserved_chanctx_list, &new_ctx->reserved_vifs);
899 sdata->reserved_chanctx = new_ctx;
900 sdata->reserved_chandef = *chandef;
901 sdata->reserved_radar_required = radar_required;
902 sdata->reserved_ready = false;
908 ieee80211_vif_chanctx_reservation_complete(struct ieee80211_sub_if_data *sdata)
910 switch (sdata->vif.type) {
911 case NL80211_IFTYPE_ADHOC:
912 case NL80211_IFTYPE_AP:
913 case NL80211_IFTYPE_MESH_POINT:
914 case NL80211_IFTYPE_OCB:
915 ieee80211_queue_work(&sdata->local->hw,
916 &sdata->csa_finalize_work);
918 case NL80211_IFTYPE_STATION:
919 ieee80211_queue_work(&sdata->local->hw,
920 &sdata->u.mgd.chswitch_work);
922 case NL80211_IFTYPE_UNSPECIFIED:
923 case NL80211_IFTYPE_AP_VLAN:
924 case NL80211_IFTYPE_WDS:
925 case NL80211_IFTYPE_MONITOR:
926 case NL80211_IFTYPE_P2P_CLIENT:
927 case NL80211_IFTYPE_P2P_GO:
928 case NL80211_IFTYPE_P2P_DEVICE:
929 case NUM_NL80211_IFTYPES:
936 ieee80211_vif_update_chandef(struct ieee80211_sub_if_data *sdata,
937 const struct cfg80211_chan_def *chandef)
939 struct ieee80211_sub_if_data *vlan;
941 sdata->vif.bss_conf.chandef = *chandef;
943 if (sdata->vif.type != NL80211_IFTYPE_AP)
946 list_for_each_entry(vlan, &sdata->u.ap.vlans, u.vlan.list)
947 vlan->vif.bss_conf.chandef = *chandef;
951 ieee80211_vif_use_reserved_reassign(struct ieee80211_sub_if_data *sdata)
953 struct ieee80211_local *local = sdata->local;
954 struct ieee80211_vif_chanctx_switch vif_chsw[1] = {};
955 struct ieee80211_chanctx *old_ctx, *new_ctx;
956 const struct cfg80211_chan_def *chandef;
960 lockdep_assert_held(&local->mtx);
961 lockdep_assert_held(&local->chanctx_mtx);
963 new_ctx = sdata->reserved_chanctx;
964 old_ctx = ieee80211_vif_get_chanctx(sdata);
966 if (WARN_ON(!sdata->reserved_ready))
969 if (WARN_ON(!new_ctx))
972 if (WARN_ON(!old_ctx))
975 if (WARN_ON(new_ctx->replace_state ==
976 IEEE80211_CHANCTX_REPLACES_OTHER))
979 chandef = ieee80211_chanctx_non_reserved_chandef(local, new_ctx,
980 &sdata->reserved_chandef);
981 if (WARN_ON(!chandef))
984 vif_chsw[0].vif = &sdata->vif;
985 vif_chsw[0].old_ctx = &old_ctx->conf;
986 vif_chsw[0].new_ctx = &new_ctx->conf;
988 list_del(&sdata->reserved_chanctx_list);
989 sdata->reserved_chanctx = NULL;
991 err = drv_switch_vif_chanctx(local, vif_chsw, 1,
992 CHANCTX_SWMODE_REASSIGN_VIF);
994 if (ieee80211_chanctx_refcount(local, new_ctx) == 0)
995 ieee80211_free_chanctx(local, new_ctx);
1000 list_move(&sdata->assigned_chanctx_list, &new_ctx->assigned_vifs);
1001 rcu_assign_pointer(sdata->vif.chanctx_conf, &new_ctx->conf);
1003 if (sdata->vif.type == NL80211_IFTYPE_AP)
1004 __ieee80211_vif_copy_chanctx_to_vlans(sdata, false);
1006 if (ieee80211_chanctx_refcount(local, old_ctx) == 0)
1007 ieee80211_free_chanctx(local, old_ctx);
1009 if (sdata->vif.bss_conf.chandef.width != sdata->reserved_chandef.width)
1010 changed = BSS_CHANGED_BANDWIDTH;
1012 ieee80211_vif_update_chandef(sdata, &sdata->reserved_chandef);
1014 ieee80211_recalc_smps_chanctx(local, new_ctx);
1015 ieee80211_recalc_radar_chanctx(local, new_ctx);
1016 ieee80211_recalc_chanctx_min_def(local, new_ctx);
1019 ieee80211_bss_info_change_notify(sdata, changed);
1022 ieee80211_vif_chanctx_reservation_complete(sdata);
1027 ieee80211_vif_use_reserved_assign(struct ieee80211_sub_if_data *sdata)
1029 struct ieee80211_local *local = sdata->local;
1030 struct ieee80211_chanctx *old_ctx, *new_ctx;
1031 const struct cfg80211_chan_def *chandef;
1034 old_ctx = ieee80211_vif_get_chanctx(sdata);
1035 new_ctx = sdata->reserved_chanctx;
1037 if (WARN_ON(!sdata->reserved_ready))
1040 if (WARN_ON(old_ctx))
1043 if (WARN_ON(!new_ctx))
1046 if (WARN_ON(new_ctx->replace_state ==
1047 IEEE80211_CHANCTX_REPLACES_OTHER))
1050 chandef = ieee80211_chanctx_non_reserved_chandef(local, new_ctx,
1051 &sdata->reserved_chandef);
1052 if (WARN_ON(!chandef))
1055 list_del(&sdata->reserved_chanctx_list);
1056 sdata->reserved_chanctx = NULL;
1058 err = ieee80211_assign_vif_chanctx(sdata, new_ctx);
1060 if (ieee80211_chanctx_refcount(local, new_ctx) == 0)
1061 ieee80211_free_chanctx(local, new_ctx);
1067 ieee80211_vif_chanctx_reservation_complete(sdata);
1072 ieee80211_vif_has_in_place_reservation(struct ieee80211_sub_if_data *sdata)
1074 struct ieee80211_chanctx *old_ctx, *new_ctx;
1076 lockdep_assert_held(&sdata->local->chanctx_mtx);
1078 new_ctx = sdata->reserved_chanctx;
1079 old_ctx = ieee80211_vif_get_chanctx(sdata);
1084 if (WARN_ON(!new_ctx))
1087 if (old_ctx->replace_state != IEEE80211_CHANCTX_WILL_BE_REPLACED)
1090 if (new_ctx->replace_state != IEEE80211_CHANCTX_REPLACES_OTHER)
1096 static int ieee80211_chsw_switch_hwconf(struct ieee80211_local *local,
1097 struct ieee80211_chanctx *new_ctx)
1099 const struct cfg80211_chan_def *chandef;
1101 lockdep_assert_held(&local->mtx);
1102 lockdep_assert_held(&local->chanctx_mtx);
1104 chandef = ieee80211_chanctx_reserved_chandef(local, new_ctx, NULL);
1105 if (WARN_ON(!chandef))
1108 local->hw.conf.radar_enabled = new_ctx->conf.radar_enabled;
1109 local->_oper_chandef = *chandef;
1110 ieee80211_hw_config(local, 0);
1115 static int ieee80211_chsw_switch_vifs(struct ieee80211_local *local,
1118 struct ieee80211_vif_chanctx_switch *vif_chsw;
1119 struct ieee80211_sub_if_data *sdata;
1120 struct ieee80211_chanctx *ctx, *old_ctx;
1123 lockdep_assert_held(&local->mtx);
1124 lockdep_assert_held(&local->chanctx_mtx);
1126 vif_chsw = kzalloc(sizeof(vif_chsw[0]) * n_vifs, GFP_KERNEL);
1131 list_for_each_entry(ctx, &local->chanctx_list, list) {
1132 if (ctx->replace_state != IEEE80211_CHANCTX_REPLACES_OTHER)
1135 if (WARN_ON(!ctx->replace_ctx)) {
1140 list_for_each_entry(sdata, &ctx->reserved_vifs,
1141 reserved_chanctx_list) {
1142 if (!ieee80211_vif_has_in_place_reservation(
1146 old_ctx = ieee80211_vif_get_chanctx(sdata);
1147 vif_chsw[i].vif = &sdata->vif;
1148 vif_chsw[i].old_ctx = &old_ctx->conf;
1149 vif_chsw[i].new_ctx = &ctx->conf;
1155 err = drv_switch_vif_chanctx(local, vif_chsw, n_vifs,
1156 CHANCTX_SWMODE_SWAP_CONTEXTS);
1163 static int ieee80211_chsw_switch_ctxs(struct ieee80211_local *local)
1165 struct ieee80211_chanctx *ctx;
1168 lockdep_assert_held(&local->mtx);
1169 lockdep_assert_held(&local->chanctx_mtx);
1171 list_for_each_entry(ctx, &local->chanctx_list, list) {
1172 if (ctx->replace_state != IEEE80211_CHANCTX_REPLACES_OTHER)
1175 if (!list_empty(&ctx->replace_ctx->assigned_vifs))
1178 ieee80211_del_chanctx(local, ctx->replace_ctx);
1179 err = ieee80211_add_chanctx(local, ctx);
1187 WARN_ON(ieee80211_add_chanctx(local, ctx));
1188 list_for_each_entry_continue_reverse(ctx, &local->chanctx_list, list) {
1189 if (ctx->replace_state != IEEE80211_CHANCTX_REPLACES_OTHER)
1192 if (!list_empty(&ctx->replace_ctx->assigned_vifs))
1195 ieee80211_del_chanctx(local, ctx);
1196 WARN_ON(ieee80211_add_chanctx(local, ctx->replace_ctx));
1202 static int ieee80211_vif_use_reserved_switch(struct ieee80211_local *local)
1204 struct ieee80211_sub_if_data *sdata, *sdata_tmp;
1205 struct ieee80211_chanctx *ctx, *ctx_tmp, *old_ctx;
1206 struct ieee80211_chanctx *new_ctx = NULL;
1207 int i, err, n_assigned, n_reserved, n_ready;
1208 int n_ctx = 0, n_vifs_switch = 0, n_vifs_assign = 0, n_vifs_ctxless = 0;
1210 lockdep_assert_held(&local->mtx);
1211 lockdep_assert_held(&local->chanctx_mtx);
1214 * If there are 2 independent pairs of channel contexts performing
1215 * cross-switch of their vifs this code will still wait until both are
1216 * ready even though it could be possible to switch one before the
1219 * For practical reasons and code simplicity just do a single huge
1224 * Verify if the reservation is still feasible.
1225 * - if it's not then disconnect
1226 * - if it is but not all vifs necessary are ready then defer
1229 list_for_each_entry(ctx, &local->chanctx_list, list) {
1230 if (ctx->replace_state != IEEE80211_CHANCTX_REPLACES_OTHER)
1233 if (WARN_ON(!ctx->replace_ctx)) {
1238 if (!local->use_chanctx)
1247 list_for_each_entry(sdata, &ctx->replace_ctx->assigned_vifs,
1248 assigned_chanctx_list) {
1250 if (sdata->reserved_chanctx) {
1252 if (sdata->reserved_ready)
1257 if (n_assigned != n_reserved) {
1258 if (n_ready == n_reserved) {
1259 wiphy_info(local->hw.wiphy,
1260 "channel context reservation cannot be finalized because some interfaces aren't switching\n");
1268 ctx->conf.radar_enabled = false;
1269 list_for_each_entry(sdata, &ctx->reserved_vifs,
1270 reserved_chanctx_list) {
1271 if (ieee80211_vif_has_in_place_reservation(sdata) &&
1272 !sdata->reserved_ready)
1275 old_ctx = ieee80211_vif_get_chanctx(sdata);
1277 if (old_ctx->replace_state ==
1278 IEEE80211_CHANCTX_WILL_BE_REPLACED)
1286 if (sdata->reserved_radar_required)
1287 ctx->conf.radar_enabled = true;
1291 if (WARN_ON(n_ctx == 0) ||
1292 WARN_ON(n_vifs_switch == 0 &&
1293 n_vifs_assign == 0 &&
1294 n_vifs_ctxless == 0) ||
1295 WARN_ON(n_ctx > 1 && !local->use_chanctx) ||
1296 WARN_ON(!new_ctx && !local->use_chanctx)) {
1302 * All necessary vifs are ready. Perform the switch now depending on
1303 * reservations and driver capabilities.
1306 if (local->use_chanctx) {
1307 if (n_vifs_switch > 0) {
1308 err = ieee80211_chsw_switch_vifs(local, n_vifs_switch);
1313 if (n_vifs_assign > 0 || n_vifs_ctxless > 0) {
1314 err = ieee80211_chsw_switch_ctxs(local);
1319 err = ieee80211_chsw_switch_hwconf(local, new_ctx);
1325 * Update all structures, values and pointers to point to new channel
1330 list_for_each_entry(ctx, &local->chanctx_list, list) {
1331 if (ctx->replace_state != IEEE80211_CHANCTX_REPLACES_OTHER)
1334 if (WARN_ON(!ctx->replace_ctx)) {
1339 list_for_each_entry(sdata, &ctx->reserved_vifs,
1340 reserved_chanctx_list) {
1343 if (!ieee80211_vif_has_in_place_reservation(sdata))
1346 rcu_assign_pointer(sdata->vif.chanctx_conf, &ctx->conf);
1348 if (sdata->vif.type == NL80211_IFTYPE_AP)
1349 __ieee80211_vif_copy_chanctx_to_vlans(sdata,
1352 sdata->radar_required = sdata->reserved_radar_required;
1354 if (sdata->vif.bss_conf.chandef.width !=
1355 sdata->reserved_chandef.width)
1356 changed = BSS_CHANGED_BANDWIDTH;
1358 ieee80211_vif_update_chandef(sdata, &sdata->reserved_chandef);
1360 ieee80211_bss_info_change_notify(sdata,
1363 ieee80211_recalc_txpower(sdata);
1366 ieee80211_recalc_chanctx_chantype(local, ctx);
1367 ieee80211_recalc_smps_chanctx(local, ctx);
1368 ieee80211_recalc_radar_chanctx(local, ctx);
1369 ieee80211_recalc_chanctx_min_def(local, ctx);
1371 list_for_each_entry_safe(sdata, sdata_tmp, &ctx->reserved_vifs,
1372 reserved_chanctx_list) {
1373 if (ieee80211_vif_get_chanctx(sdata) != ctx)
1376 list_del(&sdata->reserved_chanctx_list);
1377 list_move(&sdata->assigned_chanctx_list,
1378 &ctx->assigned_vifs);
1379 sdata->reserved_chanctx = NULL;
1381 ieee80211_vif_chanctx_reservation_complete(sdata);
1385 * This context might have been a dependency for an already
1386 * ready re-assign reservation interface that was deferred. Do
1387 * not propagate error to the caller though. The in-place
1388 * reservation for originally requested interface has already
1389 * succeeded at this point.
1391 list_for_each_entry_safe(sdata, sdata_tmp, &ctx->reserved_vifs,
1392 reserved_chanctx_list) {
1393 if (WARN_ON(ieee80211_vif_has_in_place_reservation(
1397 if (WARN_ON(sdata->reserved_chanctx != ctx))
1400 if (!sdata->reserved_ready)
1403 if (ieee80211_vif_get_chanctx(sdata))
1404 err = ieee80211_vif_use_reserved_reassign(
1407 err = ieee80211_vif_use_reserved_assign(sdata);
1411 "failed to finalize (re-)assign reservation (err=%d)\n",
1413 ieee80211_vif_unreserve_chanctx(sdata);
1414 cfg80211_stop_iface(local->hw.wiphy,
1422 * Finally free old contexts
1425 list_for_each_entry_safe(ctx, ctx_tmp, &local->chanctx_list, list) {
1426 if (ctx->replace_state != IEEE80211_CHANCTX_WILL_BE_REPLACED)
1429 ctx->replace_ctx->replace_ctx = NULL;
1430 ctx->replace_ctx->replace_state =
1431 IEEE80211_CHANCTX_REPLACE_NONE;
1433 list_del_rcu(&ctx->list);
1434 kfree_rcu(ctx, rcu_head);
1440 list_for_each_entry(ctx, &local->chanctx_list, list) {
1441 if (ctx->replace_state != IEEE80211_CHANCTX_REPLACES_OTHER)
1444 list_for_each_entry_safe(sdata, sdata_tmp, &ctx->reserved_vifs,
1445 reserved_chanctx_list) {
1446 ieee80211_vif_unreserve_chanctx(sdata);
1447 ieee80211_vif_chanctx_reservation_complete(sdata);
1454 static void __ieee80211_vif_release_channel(struct ieee80211_sub_if_data *sdata)
1456 struct ieee80211_local *local = sdata->local;
1457 struct ieee80211_chanctx_conf *conf;
1458 struct ieee80211_chanctx *ctx;
1459 bool use_reserved_switch = false;
1461 lockdep_assert_held(&local->chanctx_mtx);
1463 conf = rcu_dereference_protected(sdata->vif.chanctx_conf,
1464 lockdep_is_held(&local->chanctx_mtx));
1468 ctx = container_of(conf, struct ieee80211_chanctx, conf);
1470 if (sdata->reserved_chanctx) {
1471 if (sdata->reserved_chanctx->replace_state ==
1472 IEEE80211_CHANCTX_REPLACES_OTHER &&
1473 ieee80211_chanctx_num_reserved(local,
1474 sdata->reserved_chanctx) > 1)
1475 use_reserved_switch = true;
1477 ieee80211_vif_unreserve_chanctx(sdata);
1480 ieee80211_assign_vif_chanctx(sdata, NULL);
1481 if (ieee80211_chanctx_refcount(local, ctx) == 0)
1482 ieee80211_free_chanctx(local, ctx);
1484 /* Unreserving may ready an in-place reservation. */
1485 if (use_reserved_switch)
1486 ieee80211_vif_use_reserved_switch(local);
1489 int ieee80211_vif_use_channel(struct ieee80211_sub_if_data *sdata,
1490 const struct cfg80211_chan_def *chandef,
1491 enum ieee80211_chanctx_mode mode)
1493 struct ieee80211_local *local = sdata->local;
1494 struct ieee80211_chanctx *ctx;
1495 u8 radar_detect_width = 0;
1498 lockdep_assert_held(&local->mtx);
1500 WARN_ON(sdata->dev && netif_carrier_ok(sdata->dev));
1502 mutex_lock(&local->chanctx_mtx);
1504 ret = cfg80211_chandef_dfs_required(local->hw.wiphy,
1506 sdata->wdev.iftype);
1510 radar_detect_width = BIT(chandef->width);
1512 sdata->radar_required = ret;
1514 ret = ieee80211_check_combinations(sdata, chandef, mode,
1515 radar_detect_width);
1519 __ieee80211_vif_release_channel(sdata);
1521 ctx = ieee80211_find_chanctx(local, chandef, mode);
1523 ctx = ieee80211_new_chanctx(local, chandef, mode);
1529 ieee80211_vif_update_chandef(sdata, chandef);
1531 ret = ieee80211_assign_vif_chanctx(sdata, ctx);
1533 /* if assign fails refcount stays the same */
1534 if (ieee80211_chanctx_refcount(local, ctx) == 0)
1535 ieee80211_free_chanctx(local, ctx);
1539 ieee80211_recalc_smps_chanctx(local, ctx);
1540 ieee80211_recalc_radar_chanctx(local, ctx);
1542 mutex_unlock(&local->chanctx_mtx);
1546 int ieee80211_vif_use_reserved_context(struct ieee80211_sub_if_data *sdata)
1548 struct ieee80211_local *local = sdata->local;
1549 struct ieee80211_chanctx *new_ctx;
1550 struct ieee80211_chanctx *old_ctx;
1553 lockdep_assert_held(&local->mtx);
1554 lockdep_assert_held(&local->chanctx_mtx);
1556 new_ctx = sdata->reserved_chanctx;
1557 old_ctx = ieee80211_vif_get_chanctx(sdata);
1559 if (WARN_ON(!new_ctx))
1562 if (WARN_ON(new_ctx->replace_state ==
1563 IEEE80211_CHANCTX_WILL_BE_REPLACED))
1566 if (WARN_ON(sdata->reserved_ready))
1569 sdata->reserved_ready = true;
1571 if (new_ctx->replace_state == IEEE80211_CHANCTX_REPLACE_NONE) {
1573 err = ieee80211_vif_use_reserved_reassign(sdata);
1575 err = ieee80211_vif_use_reserved_assign(sdata);
1582 * In-place reservation may need to be finalized now either if:
1583 * a) sdata is taking part in the swapping itself and is the last one
1584 * b) sdata has switched with a re-assign reservation to an existing
1585 * context readying in-place switching of old_ctx
1587 * In case of (b) do not propagate the error up because the requested
1588 * sdata already switched successfully. Just spill an extra warning.
1589 * The ieee80211_vif_use_reserved_switch() already stops all necessary
1590 * interfaces upon failure.
1593 old_ctx->replace_state == IEEE80211_CHANCTX_WILL_BE_REPLACED) ||
1594 new_ctx->replace_state == IEEE80211_CHANCTX_REPLACES_OTHER) {
1595 err = ieee80211_vif_use_reserved_switch(local);
1596 if (err && err != -EAGAIN) {
1597 if (new_ctx->replace_state ==
1598 IEEE80211_CHANCTX_REPLACES_OTHER)
1601 wiphy_info(local->hw.wiphy,
1602 "depending in-place reservation failed (err=%d)\n",
1610 int ieee80211_vif_change_bandwidth(struct ieee80211_sub_if_data *sdata,
1611 const struct cfg80211_chan_def *chandef,
1614 struct ieee80211_local *local = sdata->local;
1615 struct ieee80211_chanctx_conf *conf;
1616 struct ieee80211_chanctx *ctx;
1617 const struct cfg80211_chan_def *compat;
1620 if (!cfg80211_chandef_usable(sdata->local->hw.wiphy, chandef,
1621 IEEE80211_CHAN_DISABLED))
1624 mutex_lock(&local->chanctx_mtx);
1625 if (cfg80211_chandef_identical(chandef, &sdata->vif.bss_conf.chandef)) {
1630 if (chandef->width == NL80211_CHAN_WIDTH_20_NOHT ||
1631 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_20_NOHT) {
1636 conf = rcu_dereference_protected(sdata->vif.chanctx_conf,
1637 lockdep_is_held(&local->chanctx_mtx));
1643 ctx = container_of(conf, struct ieee80211_chanctx, conf);
1645 compat = cfg80211_chandef_compatible(&conf->def, chandef);
1651 switch (ctx->replace_state) {
1652 case IEEE80211_CHANCTX_REPLACE_NONE:
1653 if (!ieee80211_chanctx_reserved_chandef(local, ctx, compat)) {
1658 case IEEE80211_CHANCTX_WILL_BE_REPLACED:
1659 /* TODO: Perhaps the bandwidth change could be treated as a
1660 * reservation itself? */
1663 case IEEE80211_CHANCTX_REPLACES_OTHER:
1664 /* channel context that is going to replace another channel
1665 * context doesn't really exist and shouldn't be assigned
1671 ieee80211_vif_update_chandef(sdata, chandef);
1673 ieee80211_recalc_chanctx_chantype(local, ctx);
1675 *changed |= BSS_CHANGED_BANDWIDTH;
1678 mutex_unlock(&local->chanctx_mtx);
1682 void ieee80211_vif_release_channel(struct ieee80211_sub_if_data *sdata)
1684 WARN_ON(sdata->dev && netif_carrier_ok(sdata->dev));
1686 lockdep_assert_held(&sdata->local->mtx);
1688 mutex_lock(&sdata->local->chanctx_mtx);
1689 __ieee80211_vif_release_channel(sdata);
1690 mutex_unlock(&sdata->local->chanctx_mtx);
1693 void ieee80211_vif_vlan_copy_chanctx(struct ieee80211_sub_if_data *sdata)
1695 struct ieee80211_local *local = sdata->local;
1696 struct ieee80211_sub_if_data *ap;
1697 struct ieee80211_chanctx_conf *conf;
1699 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_AP_VLAN || !sdata->bss))
1702 ap = container_of(sdata->bss, struct ieee80211_sub_if_data, u.ap);
1704 mutex_lock(&local->chanctx_mtx);
1706 conf = rcu_dereference_protected(ap->vif.chanctx_conf,
1707 lockdep_is_held(&local->chanctx_mtx));
1708 rcu_assign_pointer(sdata->vif.chanctx_conf, conf);
1709 mutex_unlock(&local->chanctx_mtx);
1712 void ieee80211_iter_chan_contexts_atomic(
1713 struct ieee80211_hw *hw,
1714 void (*iter)(struct ieee80211_hw *hw,
1715 struct ieee80211_chanctx_conf *chanctx_conf,
1719 struct ieee80211_local *local = hw_to_local(hw);
1720 struct ieee80211_chanctx *ctx;
1723 list_for_each_entry_rcu(ctx, &local->chanctx_list, list)
1724 if (ctx->driver_present)
1725 iter(hw, &ctx->conf, iter_data);
1728 EXPORT_SYMBOL_GPL(ieee80211_iter_chan_contexts_atomic);