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)) {
347 ieee80211_recalc_chanctx_min_def(local, ctx);
351 WARN_ON(!cfg80211_chandef_compatible(&ctx->conf.def, chandef));
353 ctx->conf.def = *chandef;
354 drv_change_chanctx(local, ctx, IEEE80211_CHANCTX_CHANGE_WIDTH);
355 ieee80211_recalc_chanctx_min_def(local, ctx);
357 if (!local->use_chanctx) {
358 local->_oper_chandef = *chandef;
359 ieee80211_hw_config(local, 0);
363 static struct ieee80211_chanctx *
364 ieee80211_find_chanctx(struct ieee80211_local *local,
365 const struct cfg80211_chan_def *chandef,
366 enum ieee80211_chanctx_mode mode)
368 struct ieee80211_chanctx *ctx;
370 lockdep_assert_held(&local->chanctx_mtx);
372 if (mode == IEEE80211_CHANCTX_EXCLUSIVE)
375 list_for_each_entry(ctx, &local->chanctx_list, list) {
376 const struct cfg80211_chan_def *compat;
378 if (ctx->replace_state != IEEE80211_CHANCTX_REPLACE_NONE)
381 if (ctx->mode == IEEE80211_CHANCTX_EXCLUSIVE)
384 compat = cfg80211_chandef_compatible(&ctx->conf.def, chandef);
388 compat = ieee80211_chanctx_reserved_chandef(local, ctx,
393 ieee80211_change_chanctx(local, ctx, compat);
401 bool ieee80211_is_radar_required(struct ieee80211_local *local)
403 struct ieee80211_sub_if_data *sdata;
405 lockdep_assert_held(&local->mtx);
408 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
409 if (sdata->radar_required) {
420 ieee80211_chanctx_radar_required(struct ieee80211_local *local,
421 struct ieee80211_chanctx *ctx)
423 struct ieee80211_chanctx_conf *conf = &ctx->conf;
424 struct ieee80211_sub_if_data *sdata;
425 bool required = false;
427 lockdep_assert_held(&local->chanctx_mtx);
428 lockdep_assert_held(&local->mtx);
431 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
432 if (!ieee80211_sdata_running(sdata))
434 if (rcu_access_pointer(sdata->vif.chanctx_conf) != conf)
436 if (!sdata->radar_required)
447 static struct ieee80211_chanctx *
448 ieee80211_alloc_chanctx(struct ieee80211_local *local,
449 const struct cfg80211_chan_def *chandef,
450 enum ieee80211_chanctx_mode mode)
452 struct ieee80211_chanctx *ctx;
454 lockdep_assert_held(&local->chanctx_mtx);
456 ctx = kzalloc(sizeof(*ctx) + local->hw.chanctx_data_size, GFP_KERNEL);
460 INIT_LIST_HEAD(&ctx->assigned_vifs);
461 INIT_LIST_HEAD(&ctx->reserved_vifs);
462 ctx->conf.def = *chandef;
463 ctx->conf.rx_chains_static = 1;
464 ctx->conf.rx_chains_dynamic = 1;
466 ctx->conf.radar_enabled = false;
467 ieee80211_recalc_chanctx_min_def(local, ctx);
472 static int ieee80211_add_chanctx(struct ieee80211_local *local,
473 struct ieee80211_chanctx *ctx)
478 lockdep_assert_held(&local->mtx);
479 lockdep_assert_held(&local->chanctx_mtx);
481 if (!local->use_chanctx)
482 local->hw.conf.radar_enabled = ctx->conf.radar_enabled;
484 /* turn idle off *before* setting channel -- some drivers need that */
485 changed = ieee80211_idle_off(local);
487 ieee80211_hw_config(local, changed);
489 if (!local->use_chanctx) {
490 local->_oper_chandef = ctx->conf.def;
491 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL);
493 err = drv_add_chanctx(local, ctx);
495 ieee80211_recalc_idle(local);
503 static struct ieee80211_chanctx *
504 ieee80211_new_chanctx(struct ieee80211_local *local,
505 const struct cfg80211_chan_def *chandef,
506 enum ieee80211_chanctx_mode mode)
508 struct ieee80211_chanctx *ctx;
511 lockdep_assert_held(&local->mtx);
512 lockdep_assert_held(&local->chanctx_mtx);
514 ctx = ieee80211_alloc_chanctx(local, chandef, mode);
516 return ERR_PTR(-ENOMEM);
518 err = ieee80211_add_chanctx(local, ctx);
524 list_add_rcu(&ctx->list, &local->chanctx_list);
528 static void ieee80211_del_chanctx(struct ieee80211_local *local,
529 struct ieee80211_chanctx *ctx)
531 lockdep_assert_held(&local->chanctx_mtx);
533 if (!local->use_chanctx) {
534 struct cfg80211_chan_def *chandef = &local->_oper_chandef;
535 chandef->width = NL80211_CHAN_WIDTH_20_NOHT;
536 chandef->center_freq1 = chandef->chan->center_freq;
537 chandef->center_freq2 = 0;
539 /* NOTE: Disabling radar is only valid here for
540 * single channel context. To be sure, check it ...
542 WARN_ON(local->hw.conf.radar_enabled &&
543 !list_empty(&local->chanctx_list));
545 local->hw.conf.radar_enabled = false;
547 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL);
549 drv_remove_chanctx(local, ctx);
552 ieee80211_recalc_idle(local);
555 static void ieee80211_free_chanctx(struct ieee80211_local *local,
556 struct ieee80211_chanctx *ctx)
558 lockdep_assert_held(&local->chanctx_mtx);
560 WARN_ON_ONCE(ieee80211_chanctx_refcount(local, ctx) != 0);
562 list_del_rcu(&ctx->list);
563 ieee80211_del_chanctx(local, ctx);
564 kfree_rcu(ctx, rcu_head);
567 void ieee80211_recalc_chanctx_chantype(struct ieee80211_local *local,
568 struct ieee80211_chanctx *ctx)
570 struct ieee80211_chanctx_conf *conf = &ctx->conf;
571 struct ieee80211_sub_if_data *sdata;
572 const struct cfg80211_chan_def *compat = NULL;
573 struct sta_info *sta;
575 lockdep_assert_held(&local->chanctx_mtx);
578 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
580 if (!ieee80211_sdata_running(sdata))
582 if (rcu_access_pointer(sdata->vif.chanctx_conf) != conf)
584 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
588 compat = &sdata->vif.bss_conf.chandef;
590 compat = cfg80211_chandef_compatible(
591 &sdata->vif.bss_conf.chandef, compat);
592 if (WARN_ON_ONCE(!compat))
596 /* TDLS peers can sometimes affect the chandef width */
597 list_for_each_entry_rcu(sta, &local->sta_list, list) {
598 if (!sta->uploaded ||
599 !test_sta_flag(sta, WLAN_STA_TDLS_WIDER_BW) ||
600 !test_sta_flag(sta, WLAN_STA_AUTHORIZED) ||
601 !sta->tdls_chandef.chan)
604 compat = cfg80211_chandef_compatible(&sta->tdls_chandef,
606 if (WARN_ON_ONCE(!compat))
614 ieee80211_change_chanctx(local, ctx, compat);
617 static void ieee80211_recalc_radar_chanctx(struct ieee80211_local *local,
618 struct ieee80211_chanctx *chanctx)
622 lockdep_assert_held(&local->chanctx_mtx);
623 /* for ieee80211_is_radar_required */
624 lockdep_assert_held(&local->mtx);
626 radar_enabled = ieee80211_chanctx_radar_required(local, chanctx);
628 if (radar_enabled == chanctx->conf.radar_enabled)
631 chanctx->conf.radar_enabled = radar_enabled;
633 if (!local->use_chanctx) {
634 local->hw.conf.radar_enabled = chanctx->conf.radar_enabled;
635 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL);
638 drv_change_chanctx(local, chanctx, IEEE80211_CHANCTX_CHANGE_RADAR);
641 static int ieee80211_assign_vif_chanctx(struct ieee80211_sub_if_data *sdata,
642 struct ieee80211_chanctx *new_ctx)
644 struct ieee80211_local *local = sdata->local;
645 struct ieee80211_chanctx_conf *conf;
646 struct ieee80211_chanctx *curr_ctx = NULL;
649 conf = rcu_dereference_protected(sdata->vif.chanctx_conf,
650 lockdep_is_held(&local->chanctx_mtx));
653 curr_ctx = container_of(conf, struct ieee80211_chanctx, conf);
655 drv_unassign_vif_chanctx(local, sdata, curr_ctx);
657 list_del(&sdata->assigned_chanctx_list);
661 ret = drv_assign_vif_chanctx(local, sdata, new_ctx);
665 conf = &new_ctx->conf;
666 list_add(&sdata->assigned_chanctx_list,
667 &new_ctx->assigned_vifs);
671 rcu_assign_pointer(sdata->vif.chanctx_conf, conf);
673 sdata->vif.bss_conf.idle = !conf;
675 if (curr_ctx && ieee80211_chanctx_num_assigned(local, curr_ctx) > 0) {
676 ieee80211_recalc_chanctx_chantype(local, curr_ctx);
677 ieee80211_recalc_smps_chanctx(local, curr_ctx);
678 ieee80211_recalc_radar_chanctx(local, curr_ctx);
679 ieee80211_recalc_chanctx_min_def(local, curr_ctx);
682 if (new_ctx && ieee80211_chanctx_num_assigned(local, new_ctx) > 0) {
683 ieee80211_recalc_txpower(sdata, false);
684 ieee80211_recalc_chanctx_min_def(local, new_ctx);
687 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE &&
688 sdata->vif.type != NL80211_IFTYPE_MONITOR)
689 ieee80211_bss_info_change_notify(sdata,
692 ieee80211_check_fast_xmit_iface(sdata);
697 void ieee80211_recalc_smps_chanctx(struct ieee80211_local *local,
698 struct ieee80211_chanctx *chanctx)
700 struct ieee80211_sub_if_data *sdata;
701 u8 rx_chains_static, rx_chains_dynamic;
703 lockdep_assert_held(&local->chanctx_mtx);
705 rx_chains_static = 1;
706 rx_chains_dynamic = 1;
709 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
710 u8 needed_static, needed_dynamic;
712 if (!ieee80211_sdata_running(sdata))
715 if (rcu_access_pointer(sdata->vif.chanctx_conf) !=
719 switch (sdata->vif.type) {
720 case NL80211_IFTYPE_P2P_DEVICE:
722 case NL80211_IFTYPE_STATION:
723 if (!sdata->u.mgd.associated)
726 case NL80211_IFTYPE_AP_VLAN:
728 case NL80211_IFTYPE_AP:
729 case NL80211_IFTYPE_ADHOC:
730 case NL80211_IFTYPE_WDS:
731 case NL80211_IFTYPE_MESH_POINT:
732 case NL80211_IFTYPE_OCB:
738 switch (sdata->smps_mode) {
740 WARN_ONCE(1, "Invalid SMPS mode %d\n",
743 case IEEE80211_SMPS_OFF:
744 needed_static = sdata->needed_rx_chains;
745 needed_dynamic = sdata->needed_rx_chains;
747 case IEEE80211_SMPS_DYNAMIC:
749 needed_dynamic = sdata->needed_rx_chains;
751 case IEEE80211_SMPS_STATIC:
757 rx_chains_static = max(rx_chains_static, needed_static);
758 rx_chains_dynamic = max(rx_chains_dynamic, needed_dynamic);
761 /* Disable SMPS for the monitor interface */
762 sdata = rcu_dereference(local->monitor_sdata);
764 rcu_access_pointer(sdata->vif.chanctx_conf) == &chanctx->conf)
765 rx_chains_dynamic = rx_chains_static = local->rx_chains;
769 if (!local->use_chanctx) {
770 if (rx_chains_static > 1)
771 local->smps_mode = IEEE80211_SMPS_OFF;
772 else if (rx_chains_dynamic > 1)
773 local->smps_mode = IEEE80211_SMPS_DYNAMIC;
775 local->smps_mode = IEEE80211_SMPS_STATIC;
776 ieee80211_hw_config(local, 0);
779 if (rx_chains_static == chanctx->conf.rx_chains_static &&
780 rx_chains_dynamic == chanctx->conf.rx_chains_dynamic)
783 chanctx->conf.rx_chains_static = rx_chains_static;
784 chanctx->conf.rx_chains_dynamic = rx_chains_dynamic;
785 drv_change_chanctx(local, chanctx, IEEE80211_CHANCTX_CHANGE_RX_CHAINS);
789 __ieee80211_vif_copy_chanctx_to_vlans(struct ieee80211_sub_if_data *sdata,
792 struct ieee80211_local *local __maybe_unused = sdata->local;
793 struct ieee80211_sub_if_data *vlan;
794 struct ieee80211_chanctx_conf *conf;
796 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_AP))
799 lockdep_assert_held(&local->mtx);
801 /* Check that conf exists, even when clearing this function
802 * must be called with the AP's channel context still there
803 * as it would otherwise cause VLANs to have an invalid
804 * channel context pointer for a while, possibly pointing
805 * to a channel context that has already been freed.
807 conf = rcu_dereference_protected(sdata->vif.chanctx_conf,
808 lockdep_is_held(&local->chanctx_mtx));
814 list_for_each_entry(vlan, &sdata->u.ap.vlans, u.vlan.list)
815 rcu_assign_pointer(vlan->vif.chanctx_conf, conf);
818 void ieee80211_vif_copy_chanctx_to_vlans(struct ieee80211_sub_if_data *sdata,
821 struct ieee80211_local *local = sdata->local;
823 mutex_lock(&local->chanctx_mtx);
825 __ieee80211_vif_copy_chanctx_to_vlans(sdata, clear);
827 mutex_unlock(&local->chanctx_mtx);
830 int ieee80211_vif_unreserve_chanctx(struct ieee80211_sub_if_data *sdata)
832 struct ieee80211_chanctx *ctx = sdata->reserved_chanctx;
834 lockdep_assert_held(&sdata->local->chanctx_mtx);
839 list_del(&sdata->reserved_chanctx_list);
840 sdata->reserved_chanctx = NULL;
842 if (ieee80211_chanctx_refcount(sdata->local, ctx) == 0) {
843 if (ctx->replace_state == IEEE80211_CHANCTX_REPLACES_OTHER) {
844 if (WARN_ON(!ctx->replace_ctx))
847 WARN_ON(ctx->replace_ctx->replace_state !=
848 IEEE80211_CHANCTX_WILL_BE_REPLACED);
849 WARN_ON(ctx->replace_ctx->replace_ctx != ctx);
851 ctx->replace_ctx->replace_ctx = NULL;
852 ctx->replace_ctx->replace_state =
853 IEEE80211_CHANCTX_REPLACE_NONE;
855 list_del_rcu(&ctx->list);
856 kfree_rcu(ctx, rcu_head);
858 ieee80211_free_chanctx(sdata->local, ctx);
865 int ieee80211_vif_reserve_chanctx(struct ieee80211_sub_if_data *sdata,
866 const struct cfg80211_chan_def *chandef,
867 enum ieee80211_chanctx_mode mode,
870 struct ieee80211_local *local = sdata->local;
871 struct ieee80211_chanctx *new_ctx, *curr_ctx, *ctx;
873 lockdep_assert_held(&local->chanctx_mtx);
875 curr_ctx = ieee80211_vif_get_chanctx(sdata);
876 if (curr_ctx && local->use_chanctx && !local->ops->switch_vif_chanctx)
879 new_ctx = ieee80211_find_reservation_chanctx(local, chandef, mode);
881 if (ieee80211_can_create_new_chanctx(local)) {
882 new_ctx = ieee80211_new_chanctx(local, chandef, mode);
884 return PTR_ERR(new_ctx);
887 (curr_ctx->replace_state ==
888 IEEE80211_CHANCTX_WILL_BE_REPLACED) ||
889 !list_empty(&curr_ctx->reserved_vifs)) {
891 * Another vif already requested this context
892 * for a reservation. Find another one hoping
893 * all vifs assigned to it will also switch
896 * TODO: This needs a little more work as some
897 * cases (more than 2 chanctx capable devices)
898 * may fail which could otherwise succeed
899 * provided some channel context juggling was
902 * Consider ctx1..3, vif1..6, each ctx has 2
903 * vifs. vif1 and vif2 from ctx1 request new
904 * different chandefs starting 2 in-place
905 * reserations with ctx4 and ctx5 replacing
906 * ctx1 and ctx2 respectively. Next vif5 and
907 * vif6 from ctx3 reserve ctx4. If vif3 and
908 * vif4 remain on ctx2 as they are then this
909 * fails unless `replace_ctx` from ctx5 is
910 * replaced with ctx3.
912 list_for_each_entry(ctx, &local->chanctx_list,
914 if (ctx->replace_state !=
915 IEEE80211_CHANCTX_REPLACE_NONE)
918 if (!list_empty(&ctx->reserved_vifs))
927 * If that's true then all available contexts already
928 * have reservations and cannot be used.
931 (curr_ctx->replace_state ==
932 IEEE80211_CHANCTX_WILL_BE_REPLACED) ||
933 !list_empty(&curr_ctx->reserved_vifs))
936 new_ctx = ieee80211_alloc_chanctx(local, chandef, mode);
940 new_ctx->replace_ctx = curr_ctx;
941 new_ctx->replace_state =
942 IEEE80211_CHANCTX_REPLACES_OTHER;
944 curr_ctx->replace_ctx = new_ctx;
945 curr_ctx->replace_state =
946 IEEE80211_CHANCTX_WILL_BE_REPLACED;
948 list_add_rcu(&new_ctx->list, &local->chanctx_list);
952 list_add(&sdata->reserved_chanctx_list, &new_ctx->reserved_vifs);
953 sdata->reserved_chanctx = new_ctx;
954 sdata->reserved_chandef = *chandef;
955 sdata->reserved_radar_required = radar_required;
956 sdata->reserved_ready = false;
962 ieee80211_vif_chanctx_reservation_complete(struct ieee80211_sub_if_data *sdata)
964 switch (sdata->vif.type) {
965 case NL80211_IFTYPE_ADHOC:
966 case NL80211_IFTYPE_AP:
967 case NL80211_IFTYPE_MESH_POINT:
968 case NL80211_IFTYPE_OCB:
969 ieee80211_queue_work(&sdata->local->hw,
970 &sdata->csa_finalize_work);
972 case NL80211_IFTYPE_STATION:
973 ieee80211_queue_work(&sdata->local->hw,
974 &sdata->u.mgd.chswitch_work);
976 case NL80211_IFTYPE_UNSPECIFIED:
977 case NL80211_IFTYPE_AP_VLAN:
978 case NL80211_IFTYPE_WDS:
979 case NL80211_IFTYPE_MONITOR:
980 case NL80211_IFTYPE_P2P_CLIENT:
981 case NL80211_IFTYPE_P2P_GO:
982 case NL80211_IFTYPE_P2P_DEVICE:
983 case NUM_NL80211_IFTYPES:
990 ieee80211_vif_update_chandef(struct ieee80211_sub_if_data *sdata,
991 const struct cfg80211_chan_def *chandef)
993 struct ieee80211_sub_if_data *vlan;
995 sdata->vif.bss_conf.chandef = *chandef;
997 if (sdata->vif.type != NL80211_IFTYPE_AP)
1000 list_for_each_entry(vlan, &sdata->u.ap.vlans, u.vlan.list)
1001 vlan->vif.bss_conf.chandef = *chandef;
1005 ieee80211_vif_use_reserved_reassign(struct ieee80211_sub_if_data *sdata)
1007 struct ieee80211_local *local = sdata->local;
1008 struct ieee80211_vif_chanctx_switch vif_chsw[1] = {};
1009 struct ieee80211_chanctx *old_ctx, *new_ctx;
1010 const struct cfg80211_chan_def *chandef;
1014 lockdep_assert_held(&local->mtx);
1015 lockdep_assert_held(&local->chanctx_mtx);
1017 new_ctx = sdata->reserved_chanctx;
1018 old_ctx = ieee80211_vif_get_chanctx(sdata);
1020 if (WARN_ON(!sdata->reserved_ready))
1023 if (WARN_ON(!new_ctx))
1026 if (WARN_ON(!old_ctx))
1029 if (WARN_ON(new_ctx->replace_state ==
1030 IEEE80211_CHANCTX_REPLACES_OTHER))
1033 chandef = ieee80211_chanctx_non_reserved_chandef(local, new_ctx,
1034 &sdata->reserved_chandef);
1035 if (WARN_ON(!chandef))
1038 ieee80211_change_chanctx(local, new_ctx, chandef);
1040 vif_chsw[0].vif = &sdata->vif;
1041 vif_chsw[0].old_ctx = &old_ctx->conf;
1042 vif_chsw[0].new_ctx = &new_ctx->conf;
1044 list_del(&sdata->reserved_chanctx_list);
1045 sdata->reserved_chanctx = NULL;
1047 err = drv_switch_vif_chanctx(local, vif_chsw, 1,
1048 CHANCTX_SWMODE_REASSIGN_VIF);
1050 if (ieee80211_chanctx_refcount(local, new_ctx) == 0)
1051 ieee80211_free_chanctx(local, new_ctx);
1056 list_move(&sdata->assigned_chanctx_list, &new_ctx->assigned_vifs);
1057 rcu_assign_pointer(sdata->vif.chanctx_conf, &new_ctx->conf);
1059 if (sdata->vif.type == NL80211_IFTYPE_AP)
1060 __ieee80211_vif_copy_chanctx_to_vlans(sdata, false);
1062 ieee80211_check_fast_xmit_iface(sdata);
1064 if (ieee80211_chanctx_refcount(local, old_ctx) == 0)
1065 ieee80211_free_chanctx(local, old_ctx);
1067 if (sdata->vif.bss_conf.chandef.width != sdata->reserved_chandef.width)
1068 changed = BSS_CHANGED_BANDWIDTH;
1070 ieee80211_vif_update_chandef(sdata, &sdata->reserved_chandef);
1072 ieee80211_recalc_smps_chanctx(local, new_ctx);
1073 ieee80211_recalc_radar_chanctx(local, new_ctx);
1074 ieee80211_recalc_chanctx_min_def(local, new_ctx);
1077 ieee80211_bss_info_change_notify(sdata, changed);
1080 ieee80211_vif_chanctx_reservation_complete(sdata);
1085 ieee80211_vif_use_reserved_assign(struct ieee80211_sub_if_data *sdata)
1087 struct ieee80211_local *local = sdata->local;
1088 struct ieee80211_chanctx *old_ctx, *new_ctx;
1089 const struct cfg80211_chan_def *chandef;
1092 old_ctx = ieee80211_vif_get_chanctx(sdata);
1093 new_ctx = sdata->reserved_chanctx;
1095 if (WARN_ON(!sdata->reserved_ready))
1098 if (WARN_ON(old_ctx))
1101 if (WARN_ON(!new_ctx))
1104 if (WARN_ON(new_ctx->replace_state ==
1105 IEEE80211_CHANCTX_REPLACES_OTHER))
1108 chandef = ieee80211_chanctx_non_reserved_chandef(local, new_ctx,
1109 &sdata->reserved_chandef);
1110 if (WARN_ON(!chandef))
1113 ieee80211_change_chanctx(local, new_ctx, chandef);
1115 list_del(&sdata->reserved_chanctx_list);
1116 sdata->reserved_chanctx = NULL;
1118 err = ieee80211_assign_vif_chanctx(sdata, new_ctx);
1120 if (ieee80211_chanctx_refcount(local, new_ctx) == 0)
1121 ieee80211_free_chanctx(local, new_ctx);
1127 ieee80211_vif_chanctx_reservation_complete(sdata);
1132 ieee80211_vif_has_in_place_reservation(struct ieee80211_sub_if_data *sdata)
1134 struct ieee80211_chanctx *old_ctx, *new_ctx;
1136 lockdep_assert_held(&sdata->local->chanctx_mtx);
1138 new_ctx = sdata->reserved_chanctx;
1139 old_ctx = ieee80211_vif_get_chanctx(sdata);
1144 if (WARN_ON(!new_ctx))
1147 if (old_ctx->replace_state != IEEE80211_CHANCTX_WILL_BE_REPLACED)
1150 if (new_ctx->replace_state != IEEE80211_CHANCTX_REPLACES_OTHER)
1156 static int ieee80211_chsw_switch_hwconf(struct ieee80211_local *local,
1157 struct ieee80211_chanctx *new_ctx)
1159 const struct cfg80211_chan_def *chandef;
1161 lockdep_assert_held(&local->mtx);
1162 lockdep_assert_held(&local->chanctx_mtx);
1164 chandef = ieee80211_chanctx_reserved_chandef(local, new_ctx, NULL);
1165 if (WARN_ON(!chandef))
1168 local->hw.conf.radar_enabled = new_ctx->conf.radar_enabled;
1169 local->_oper_chandef = *chandef;
1170 ieee80211_hw_config(local, 0);
1175 static int ieee80211_chsw_switch_vifs(struct ieee80211_local *local,
1178 struct ieee80211_vif_chanctx_switch *vif_chsw;
1179 struct ieee80211_sub_if_data *sdata;
1180 struct ieee80211_chanctx *ctx, *old_ctx;
1183 lockdep_assert_held(&local->mtx);
1184 lockdep_assert_held(&local->chanctx_mtx);
1186 vif_chsw = kzalloc(sizeof(vif_chsw[0]) * n_vifs, GFP_KERNEL);
1191 list_for_each_entry(ctx, &local->chanctx_list, list) {
1192 if (ctx->replace_state != IEEE80211_CHANCTX_REPLACES_OTHER)
1195 if (WARN_ON(!ctx->replace_ctx)) {
1200 list_for_each_entry(sdata, &ctx->reserved_vifs,
1201 reserved_chanctx_list) {
1202 if (!ieee80211_vif_has_in_place_reservation(
1206 old_ctx = ieee80211_vif_get_chanctx(sdata);
1207 vif_chsw[i].vif = &sdata->vif;
1208 vif_chsw[i].old_ctx = &old_ctx->conf;
1209 vif_chsw[i].new_ctx = &ctx->conf;
1215 err = drv_switch_vif_chanctx(local, vif_chsw, n_vifs,
1216 CHANCTX_SWMODE_SWAP_CONTEXTS);
1223 static int ieee80211_chsw_switch_ctxs(struct ieee80211_local *local)
1225 struct ieee80211_chanctx *ctx;
1228 lockdep_assert_held(&local->mtx);
1229 lockdep_assert_held(&local->chanctx_mtx);
1231 list_for_each_entry(ctx, &local->chanctx_list, list) {
1232 if (ctx->replace_state != IEEE80211_CHANCTX_REPLACES_OTHER)
1235 if (!list_empty(&ctx->replace_ctx->assigned_vifs))
1238 ieee80211_del_chanctx(local, ctx->replace_ctx);
1239 err = ieee80211_add_chanctx(local, ctx);
1247 WARN_ON(ieee80211_add_chanctx(local, ctx));
1248 list_for_each_entry_continue_reverse(ctx, &local->chanctx_list, list) {
1249 if (ctx->replace_state != IEEE80211_CHANCTX_REPLACES_OTHER)
1252 if (!list_empty(&ctx->replace_ctx->assigned_vifs))
1255 ieee80211_del_chanctx(local, ctx);
1256 WARN_ON(ieee80211_add_chanctx(local, ctx->replace_ctx));
1262 static int ieee80211_vif_use_reserved_switch(struct ieee80211_local *local)
1264 struct ieee80211_sub_if_data *sdata, *sdata_tmp;
1265 struct ieee80211_chanctx *ctx, *ctx_tmp, *old_ctx;
1266 struct ieee80211_chanctx *new_ctx = NULL;
1267 int i, err, n_assigned, n_reserved, n_ready;
1268 int n_ctx = 0, n_vifs_switch = 0, n_vifs_assign = 0, n_vifs_ctxless = 0;
1270 lockdep_assert_held(&local->mtx);
1271 lockdep_assert_held(&local->chanctx_mtx);
1274 * If there are 2 independent pairs of channel contexts performing
1275 * cross-switch of their vifs this code will still wait until both are
1276 * ready even though it could be possible to switch one before the
1279 * For practical reasons and code simplicity just do a single huge
1284 * Verify if the reservation is still feasible.
1285 * - if it's not then disconnect
1286 * - if it is but not all vifs necessary are ready then defer
1289 list_for_each_entry(ctx, &local->chanctx_list, list) {
1290 if (ctx->replace_state != IEEE80211_CHANCTX_REPLACES_OTHER)
1293 if (WARN_ON(!ctx->replace_ctx)) {
1298 if (!local->use_chanctx)
1307 list_for_each_entry(sdata, &ctx->replace_ctx->assigned_vifs,
1308 assigned_chanctx_list) {
1310 if (sdata->reserved_chanctx) {
1312 if (sdata->reserved_ready)
1317 if (n_assigned != n_reserved) {
1318 if (n_ready == n_reserved) {
1319 wiphy_info(local->hw.wiphy,
1320 "channel context reservation cannot be finalized because some interfaces aren't switching\n");
1328 ctx->conf.radar_enabled = false;
1329 list_for_each_entry(sdata, &ctx->reserved_vifs,
1330 reserved_chanctx_list) {
1331 if (ieee80211_vif_has_in_place_reservation(sdata) &&
1332 !sdata->reserved_ready)
1335 old_ctx = ieee80211_vif_get_chanctx(sdata);
1337 if (old_ctx->replace_state ==
1338 IEEE80211_CHANCTX_WILL_BE_REPLACED)
1346 if (sdata->reserved_radar_required)
1347 ctx->conf.radar_enabled = true;
1351 if (WARN_ON(n_ctx == 0) ||
1352 WARN_ON(n_vifs_switch == 0 &&
1353 n_vifs_assign == 0 &&
1354 n_vifs_ctxless == 0) ||
1355 WARN_ON(n_ctx > 1 && !local->use_chanctx) ||
1356 WARN_ON(!new_ctx && !local->use_chanctx)) {
1362 * All necessary vifs are ready. Perform the switch now depending on
1363 * reservations and driver capabilities.
1366 if (local->use_chanctx) {
1367 if (n_vifs_switch > 0) {
1368 err = ieee80211_chsw_switch_vifs(local, n_vifs_switch);
1373 if (n_vifs_assign > 0 || n_vifs_ctxless > 0) {
1374 err = ieee80211_chsw_switch_ctxs(local);
1379 err = ieee80211_chsw_switch_hwconf(local, new_ctx);
1385 * Update all structures, values and pointers to point to new channel
1390 list_for_each_entry(ctx, &local->chanctx_list, list) {
1391 if (ctx->replace_state != IEEE80211_CHANCTX_REPLACES_OTHER)
1394 if (WARN_ON(!ctx->replace_ctx)) {
1399 list_for_each_entry(sdata, &ctx->reserved_vifs,
1400 reserved_chanctx_list) {
1403 if (!ieee80211_vif_has_in_place_reservation(sdata))
1406 rcu_assign_pointer(sdata->vif.chanctx_conf, &ctx->conf);
1408 if (sdata->vif.type == NL80211_IFTYPE_AP)
1409 __ieee80211_vif_copy_chanctx_to_vlans(sdata,
1412 ieee80211_check_fast_xmit_iface(sdata);
1414 sdata->radar_required = sdata->reserved_radar_required;
1416 if (sdata->vif.bss_conf.chandef.width !=
1417 sdata->reserved_chandef.width)
1418 changed = BSS_CHANGED_BANDWIDTH;
1420 ieee80211_vif_update_chandef(sdata, &sdata->reserved_chandef);
1422 ieee80211_bss_info_change_notify(sdata,
1425 ieee80211_recalc_txpower(sdata, false);
1428 ieee80211_recalc_chanctx_chantype(local, ctx);
1429 ieee80211_recalc_smps_chanctx(local, ctx);
1430 ieee80211_recalc_radar_chanctx(local, ctx);
1431 ieee80211_recalc_chanctx_min_def(local, ctx);
1433 list_for_each_entry_safe(sdata, sdata_tmp, &ctx->reserved_vifs,
1434 reserved_chanctx_list) {
1435 if (ieee80211_vif_get_chanctx(sdata) != ctx)
1438 list_del(&sdata->reserved_chanctx_list);
1439 list_move(&sdata->assigned_chanctx_list,
1440 &ctx->assigned_vifs);
1441 sdata->reserved_chanctx = NULL;
1443 ieee80211_vif_chanctx_reservation_complete(sdata);
1447 * This context might have been a dependency for an already
1448 * ready re-assign reservation interface that was deferred. Do
1449 * not propagate error to the caller though. The in-place
1450 * reservation for originally requested interface has already
1451 * succeeded at this point.
1453 list_for_each_entry_safe(sdata, sdata_tmp, &ctx->reserved_vifs,
1454 reserved_chanctx_list) {
1455 if (WARN_ON(ieee80211_vif_has_in_place_reservation(
1459 if (WARN_ON(sdata->reserved_chanctx != ctx))
1462 if (!sdata->reserved_ready)
1465 if (ieee80211_vif_get_chanctx(sdata))
1466 err = ieee80211_vif_use_reserved_reassign(
1469 err = ieee80211_vif_use_reserved_assign(sdata);
1473 "failed to finalize (re-)assign reservation (err=%d)\n",
1475 ieee80211_vif_unreserve_chanctx(sdata);
1476 cfg80211_stop_iface(local->hw.wiphy,
1484 * Finally free old contexts
1487 list_for_each_entry_safe(ctx, ctx_tmp, &local->chanctx_list, list) {
1488 if (ctx->replace_state != IEEE80211_CHANCTX_WILL_BE_REPLACED)
1491 ctx->replace_ctx->replace_ctx = NULL;
1492 ctx->replace_ctx->replace_state =
1493 IEEE80211_CHANCTX_REPLACE_NONE;
1495 list_del_rcu(&ctx->list);
1496 kfree_rcu(ctx, rcu_head);
1502 list_for_each_entry(ctx, &local->chanctx_list, list) {
1503 if (ctx->replace_state != IEEE80211_CHANCTX_REPLACES_OTHER)
1506 list_for_each_entry_safe(sdata, sdata_tmp, &ctx->reserved_vifs,
1507 reserved_chanctx_list) {
1508 ieee80211_vif_unreserve_chanctx(sdata);
1509 ieee80211_vif_chanctx_reservation_complete(sdata);
1516 static void __ieee80211_vif_release_channel(struct ieee80211_sub_if_data *sdata)
1518 struct ieee80211_local *local = sdata->local;
1519 struct ieee80211_chanctx_conf *conf;
1520 struct ieee80211_chanctx *ctx;
1521 bool use_reserved_switch = false;
1523 lockdep_assert_held(&local->chanctx_mtx);
1525 conf = rcu_dereference_protected(sdata->vif.chanctx_conf,
1526 lockdep_is_held(&local->chanctx_mtx));
1530 ctx = container_of(conf, struct ieee80211_chanctx, conf);
1532 if (sdata->reserved_chanctx) {
1533 if (sdata->reserved_chanctx->replace_state ==
1534 IEEE80211_CHANCTX_REPLACES_OTHER &&
1535 ieee80211_chanctx_num_reserved(local,
1536 sdata->reserved_chanctx) > 1)
1537 use_reserved_switch = true;
1539 ieee80211_vif_unreserve_chanctx(sdata);
1542 ieee80211_assign_vif_chanctx(sdata, NULL);
1543 if (ieee80211_chanctx_refcount(local, ctx) == 0)
1544 ieee80211_free_chanctx(local, ctx);
1546 sdata->radar_required = false;
1548 /* Unreserving may ready an in-place reservation. */
1549 if (use_reserved_switch)
1550 ieee80211_vif_use_reserved_switch(local);
1553 int ieee80211_vif_use_channel(struct ieee80211_sub_if_data *sdata,
1554 const struct cfg80211_chan_def *chandef,
1555 enum ieee80211_chanctx_mode mode)
1557 struct ieee80211_local *local = sdata->local;
1558 struct ieee80211_chanctx *ctx;
1559 u8 radar_detect_width = 0;
1562 lockdep_assert_held(&local->mtx);
1564 WARN_ON(sdata->dev && netif_carrier_ok(sdata->dev));
1566 mutex_lock(&local->chanctx_mtx);
1568 ret = cfg80211_chandef_dfs_required(local->hw.wiphy,
1570 sdata->wdev.iftype);
1574 radar_detect_width = BIT(chandef->width);
1576 sdata->radar_required = ret;
1578 ret = ieee80211_check_combinations(sdata, chandef, mode,
1579 radar_detect_width);
1583 __ieee80211_vif_release_channel(sdata);
1585 ctx = ieee80211_find_chanctx(local, chandef, mode);
1587 ctx = ieee80211_new_chanctx(local, chandef, mode);
1593 ieee80211_vif_update_chandef(sdata, chandef);
1595 ret = ieee80211_assign_vif_chanctx(sdata, ctx);
1597 /* if assign fails refcount stays the same */
1598 if (ieee80211_chanctx_refcount(local, ctx) == 0)
1599 ieee80211_free_chanctx(local, ctx);
1603 ieee80211_recalc_smps_chanctx(local, ctx);
1604 ieee80211_recalc_radar_chanctx(local, ctx);
1607 sdata->radar_required = false;
1609 mutex_unlock(&local->chanctx_mtx);
1613 int ieee80211_vif_use_reserved_context(struct ieee80211_sub_if_data *sdata)
1615 struct ieee80211_local *local = sdata->local;
1616 struct ieee80211_chanctx *new_ctx;
1617 struct ieee80211_chanctx *old_ctx;
1620 lockdep_assert_held(&local->mtx);
1621 lockdep_assert_held(&local->chanctx_mtx);
1623 new_ctx = sdata->reserved_chanctx;
1624 old_ctx = ieee80211_vif_get_chanctx(sdata);
1626 if (WARN_ON(!new_ctx))
1629 if (WARN_ON(new_ctx->replace_state ==
1630 IEEE80211_CHANCTX_WILL_BE_REPLACED))
1633 if (WARN_ON(sdata->reserved_ready))
1636 sdata->reserved_ready = true;
1638 if (new_ctx->replace_state == IEEE80211_CHANCTX_REPLACE_NONE) {
1640 err = ieee80211_vif_use_reserved_reassign(sdata);
1642 err = ieee80211_vif_use_reserved_assign(sdata);
1649 * In-place reservation may need to be finalized now either if:
1650 * a) sdata is taking part in the swapping itself and is the last one
1651 * b) sdata has switched with a re-assign reservation to an existing
1652 * context readying in-place switching of old_ctx
1654 * In case of (b) do not propagate the error up because the requested
1655 * sdata already switched successfully. Just spill an extra warning.
1656 * The ieee80211_vif_use_reserved_switch() already stops all necessary
1657 * interfaces upon failure.
1660 old_ctx->replace_state == IEEE80211_CHANCTX_WILL_BE_REPLACED) ||
1661 new_ctx->replace_state == IEEE80211_CHANCTX_REPLACES_OTHER) {
1662 err = ieee80211_vif_use_reserved_switch(local);
1663 if (err && err != -EAGAIN) {
1664 if (new_ctx->replace_state ==
1665 IEEE80211_CHANCTX_REPLACES_OTHER)
1668 wiphy_info(local->hw.wiphy,
1669 "depending in-place reservation failed (err=%d)\n",
1677 int ieee80211_vif_change_bandwidth(struct ieee80211_sub_if_data *sdata,
1678 const struct cfg80211_chan_def *chandef,
1681 struct ieee80211_local *local = sdata->local;
1682 struct ieee80211_chanctx_conf *conf;
1683 struct ieee80211_chanctx *ctx;
1684 const struct cfg80211_chan_def *compat;
1687 if (!cfg80211_chandef_usable(sdata->local->hw.wiphy, chandef,
1688 IEEE80211_CHAN_DISABLED))
1691 mutex_lock(&local->chanctx_mtx);
1692 if (cfg80211_chandef_identical(chandef, &sdata->vif.bss_conf.chandef)) {
1697 if (chandef->width == NL80211_CHAN_WIDTH_20_NOHT ||
1698 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_20_NOHT) {
1703 conf = rcu_dereference_protected(sdata->vif.chanctx_conf,
1704 lockdep_is_held(&local->chanctx_mtx));
1710 ctx = container_of(conf, struct ieee80211_chanctx, conf);
1712 compat = cfg80211_chandef_compatible(&conf->def, chandef);
1718 switch (ctx->replace_state) {
1719 case IEEE80211_CHANCTX_REPLACE_NONE:
1720 if (!ieee80211_chanctx_reserved_chandef(local, ctx, compat)) {
1725 case IEEE80211_CHANCTX_WILL_BE_REPLACED:
1726 /* TODO: Perhaps the bandwidth change could be treated as a
1727 * reservation itself? */
1730 case IEEE80211_CHANCTX_REPLACES_OTHER:
1731 /* channel context that is going to replace another channel
1732 * context doesn't really exist and shouldn't be assigned
1738 ieee80211_vif_update_chandef(sdata, chandef);
1740 ieee80211_recalc_chanctx_chantype(local, ctx);
1742 *changed |= BSS_CHANGED_BANDWIDTH;
1745 mutex_unlock(&local->chanctx_mtx);
1749 void ieee80211_vif_release_channel(struct ieee80211_sub_if_data *sdata)
1751 WARN_ON(sdata->dev && netif_carrier_ok(sdata->dev));
1753 lockdep_assert_held(&sdata->local->mtx);
1755 mutex_lock(&sdata->local->chanctx_mtx);
1756 __ieee80211_vif_release_channel(sdata);
1757 mutex_unlock(&sdata->local->chanctx_mtx);
1760 void ieee80211_vif_vlan_copy_chanctx(struct ieee80211_sub_if_data *sdata)
1762 struct ieee80211_local *local = sdata->local;
1763 struct ieee80211_sub_if_data *ap;
1764 struct ieee80211_chanctx_conf *conf;
1766 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_AP_VLAN || !sdata->bss))
1769 ap = container_of(sdata->bss, struct ieee80211_sub_if_data, u.ap);
1771 mutex_lock(&local->chanctx_mtx);
1773 conf = rcu_dereference_protected(ap->vif.chanctx_conf,
1774 lockdep_is_held(&local->chanctx_mtx));
1775 rcu_assign_pointer(sdata->vif.chanctx_conf, conf);
1776 mutex_unlock(&local->chanctx_mtx);
1779 void ieee80211_iter_chan_contexts_atomic(
1780 struct ieee80211_hw *hw,
1781 void (*iter)(struct ieee80211_hw *hw,
1782 struct ieee80211_chanctx_conf *chanctx_conf,
1786 struct ieee80211_local *local = hw_to_local(hw);
1787 struct ieee80211_chanctx *ctx;
1790 list_for_each_entry_rcu(ctx, &local->chanctx_list, list)
1791 if (ctx->driver_present)
1792 iter(hw, &ctx->conf, iter_data);
1795 EXPORT_SYMBOL_GPL(ieee80211_iter_chan_contexts_atomic);