wifi: mac80211: make channel context code MLO-aware

Make the channel context code MLO aware, along with some
functions that it uses, so that the chan.c file is now
MLD-clean and no longer uses deflink/bss_conf/etc.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>

19 files changed, 566 insertions, 391 deletions

diff --git a/net/mac80211/cfg.c b/net/mac80211/cfg.c
index 69f540b0cbc6..884d2cfcec1e 100644
--- a/net/mac80211/cfg.c
+++ b/net/mac80211/cfg.c
@@ -840,9 +840,10 @@ static int ieee80211_set_monitor_channel(struct wiphy *wiphy,
 		sdata = wiphy_dereference(local->hw.wiphy,
 					  local->monitor_sdata);
 		if (sdata) {
-			ieee80211_vif_release_channel(sdata);
-			ret = ieee80211_vif_use_channel(sdata, chandef,
-					IEEE80211_CHANCTX_EXCLUSIVE);
+			ieee80211_link_release_channel(sdata->link[0]);
+			ret = ieee80211_link_use_channel(sdata->link[0],
+							 chandef,
+							 IEEE80211_CHANCTX_EXCLUSIVE);
 		}
 	} else if (local->open_count == local->monitors) {
 		local->_oper_chandef = *chandef;
@@ -1183,10 +1184,12 @@ static int ieee80211_start_ap(struct wiphy *wiphy, struct net_device *dev,
 	}
 
 	mutex_lock(&local->mtx);
-	err = ieee80211_vif_use_channel(sdata, &params->chandef,
-					IEEE80211_CHANCTX_SHARED);
+	err = ieee80211_link_use_channel(sdata->link[params->beacon.link_id],
+					 &params->chandef,
+					 IEEE80211_CHANCTX_SHARED);
 	if (!err)
-		ieee80211_vif_copy_chanctx_to_vlans(sdata, false);
+		ieee80211_link_copy_chanctx_to_vlans(sdata->link[params->beacon.link_id],
+						     false);
 	mutex_unlock(&local->mtx);
 	if (err) {
 		sdata->vif.bss_conf.beacon_int = prev_beacon_int;
@@ -1296,7 +1299,7 @@ static int ieee80211_start_ap(struct wiphy *wiphy, struct net_device *dev,
 
 error:
 	mutex_lock(&local->mtx);
-	ieee80211_vif_release_channel(sdata);
+	ieee80211_link_release_channel(sdata->link[params->beacon.link_id]);
 	mutex_unlock(&local->mtx);
 
 	return err;
@@ -1433,8 +1436,8 @@ static int ieee80211_stop_ap(struct wiphy *wiphy, struct net_device *dev,
 	ieee80211_purge_tx_queue(&local->hw, &sdata->u.ap.ps.bc_buf);
 
 	mutex_lock(&local->mtx);
-	ieee80211_vif_copy_chanctx_to_vlans(sdata, true);
-	ieee80211_vif_release_channel(sdata);
+	ieee80211_link_copy_chanctx_to_vlans(sdata->link[link_id], true);
+	ieee80211_link_release_channel(sdata->link[link_id]);
 	mutex_unlock(&local->mtx);
 
 	return 0;
@@ -2401,8 +2404,8 @@ static int ieee80211_join_mesh(struct wiphy *wiphy, struct net_device *dev,
 	sdata->deflink.needed_rx_chains = sdata->local->rx_chains;
 
 	mutex_lock(&sdata->local->mtx);
-	err = ieee80211_vif_use_channel(sdata, &setup->chandef,
-					IEEE80211_CHANCTX_SHARED);
+	err = ieee80211_link_use_channel(sdata->link[0], &setup->chandef,
+					 IEEE80211_CHANCTX_SHARED);
 	mutex_unlock(&sdata->local->mtx);
 	if (err)
 		return err;
@@ -2416,7 +2419,7 @@ static int ieee80211_leave_mesh(struct wiphy *wiphy, struct net_device *dev)
 
 	ieee80211_stop_mesh(sdata);
 	mutex_lock(&sdata->local->mtx);
-	ieee80211_vif_release_channel(sdata);
+	ieee80211_link_release_channel(sdata->link[0]);
 	kfree(sdata->u.mesh.ie);
 	mutex_unlock(&sdata->local->mtx);
 
@@ -3145,8 +3148,8 @@ static int ieee80211_start_radar_detection(struct wiphy *wiphy,
 	sdata->deflink.smps_mode = IEEE80211_SMPS_OFF;
 	sdata->deflink.needed_rx_chains = local->rx_chains;
 
-	err = ieee80211_vif_use_channel(sdata, chandef,
-					IEEE80211_CHANCTX_SHARED);
+	err = ieee80211_link_use_channel(sdata->link[0], chandef,
+					 IEEE80211_CHANCTX_SHARED);
 	if (err)
 		goto out_unlock;
 
@@ -3174,7 +3177,7 @@ static void ieee80211_end_cac(struct wiphy *wiphy,
 		cancel_delayed_work(&sdata->deflink.dfs_cac_timer_work);
 
 		if (sdata->wdev.cac_started) {
-			ieee80211_vif_release_channel(sdata);
+			ieee80211_link_release_channel(sdata->link[0]);
 			sdata->wdev.cac_started = false;
 		}
 	}
@@ -3378,7 +3381,7 @@ static int __ieee80211_csa_finalize(struct ieee80211_sub_if_data *sdata)
 		if (sdata->deflink.reserved_ready)
 			return 0;
 
-		return ieee80211_vif_use_reserved_context(sdata);
+		return ieee80211_link_use_reserved_context(sdata->link[0]);
 	}
 
 	if (!cfg80211_chandef_identical(&sdata->vif.bss_conf.chandef,
@@ -3643,16 +3646,16 @@ __ieee80211_channel_switch(struct wiphy *wiphy, struct net_device *dev,
 	if (err)
 		goto out;
 
-	err = ieee80211_vif_reserve_chanctx(sdata, &params->chandef,
-					    chanctx->mode,
-					    params->radar_required);
+	err = ieee80211_link_reserve_chanctx(sdata->link[0], &params->chandef,
+					     chanctx->mode,
+					     params->radar_required);
 	if (err)
 		goto out;
 
 	/* if reservation is invalid then this will fail */
 	err = ieee80211_check_combinations(sdata, NULL, chanctx->mode, 0);
 	if (err) {
-		ieee80211_vif_unreserve_chanctx(sdata);
+		ieee80211_link_unreserve_chanctx(sdata->link[0]);
 		goto out;
 	}
 
@@ -3662,7 +3665,7 @@ __ieee80211_channel_switch(struct wiphy *wiphy, struct net_device *dev,
 
 	err = ieee80211_set_csa_beacon(sdata, params, &changed);
 	if (err) {
-		ieee80211_vif_unreserve_chanctx(sdata);
+		ieee80211_link_unreserve_chanctx(sdata->link[0]);
 		goto out;
 	}
 
@@ -3921,9 +3924,9 @@ static int ieee80211_cfg_get_channel(struct wiphy *wiphy,
 	int ret = -ENODATA;
 
 	rcu_read_lock();
-	chanctx_conf = rcu_dereference(sdata->vif.bss_conf.chanctx_conf);
+	chanctx_conf = rcu_dereference(sdata->vif.link_conf[link_id]->chanctx_conf);
 	if (chanctx_conf) {
-		*chandef = sdata->vif.bss_conf.chandef;
+		*chandef = sdata->vif.link_conf[link_id]->chandef;
 		ret = 0;
 	} else if (local->open_count > 0 &&
 		   local->open_count == local->monitors &&
@@ -3980,7 +3983,8 @@ static int ieee80211_set_ap_chanwidth(struct wiphy *wiphy,
 	int ret;
 	u32 changed = 0;
 
-	ret = ieee80211_vif_change_bandwidth(sdata, chandef, &changed);
+	ret = ieee80211_link_change_bandwidth(sdata->link[link_id], chandef,
+					      &changed);
 	if (ret == 0)
 		ieee80211_link_info_change_notify(sdata, link_id, changed);
 
diff --git a/net/mac80211/chan.c b/net/mac80211/chan.c
index 5d8b49f20198..4f25660d0eeb 100644
--- a/net/mac80211/chan.c
+++ b/net/mac80211/chan.c
@@ -15,12 +15,12 @@
 static int ieee80211_chanctx_num_assigned(struct ieee80211_local *local,
 					  struct ieee80211_chanctx *ctx)
 {
-	struct ieee80211_sub_if_data *sdata;
+	struct ieee80211_link_data *link;
 	int num = 0;
 
 	lockdep_assert_held(&local->chanctx_mtx);
 
-	list_for_each_entry(sdata, &ctx->assigned_vifs, assigned_chanctx_list)
+	list_for_each_entry(link, &ctx->assigned_links, assigned_chanctx_list)
 		num++;
 
 	return num;
@@ -29,12 +29,12 @@ static int ieee80211_chanctx_num_assigned(struct ieee80211_local *local,
 static int ieee80211_chanctx_num_reserved(struct ieee80211_local *local,
 					  struct ieee80211_chanctx *ctx)
 {
-	struct ieee80211_sub_if_data *sdata;
+	struct ieee80211_link_data *link;
 	int num = 0;
 
 	lockdep_assert_held(&local->chanctx_mtx);
 
-	list_for_each_entry(sdata, &ctx->reserved_vifs, reserved_chanctx_list)
+	list_for_each_entry(link, &ctx->reserved_links, reserved_chanctx_list)
 		num++;
 
 	return num;
@@ -67,12 +67,14 @@ static bool ieee80211_can_create_new_chanctx(struct ieee80211_local *local)
 }
 
 static struct ieee80211_chanctx *
-ieee80211_vif_get_chanctx(struct ieee80211_sub_if_data *sdata)
+ieee80211_vif_get_chanctx(struct ieee80211_sub_if_data *sdata,
+			  unsigned int link_id)
 {
+	struct ieee80211_bss_conf *link_conf = sdata->vif.link_conf[link_id];
 	struct ieee80211_local *local __maybe_unused = sdata->local;
 	struct ieee80211_chanctx_conf *conf;
 
-	conf = rcu_dereference_protected(sdata->vif.bss_conf.chanctx_conf,
+	conf = rcu_dereference_protected(link_conf->chanctx_conf,
 					 lockdep_is_held(&local->chanctx_mtx));
 	if (!conf)
 		return NULL;
@@ -80,21 +82,27 @@ ieee80211_vif_get_chanctx(struct ieee80211_sub_if_data *sdata)
 	return container_of(conf, struct ieee80211_chanctx, conf);
 }
 
+static struct ieee80211_chanctx *
+ieee80211_link_get_chanctx(struct ieee80211_link_data *link)
+{
+	return ieee80211_vif_get_chanctx(link->sdata, link->link_id);
+}
+
 static const struct cfg80211_chan_def *
 ieee80211_chanctx_reserved_chandef(struct ieee80211_local *local,
 				   struct ieee80211_chanctx *ctx,
 				   const struct cfg80211_chan_def *compat)
 {
-	struct ieee80211_sub_if_data *sdata;
+	struct ieee80211_link_data *link;
 
 	lockdep_assert_held(&local->chanctx_mtx);
 
-	list_for_each_entry(sdata, &ctx->reserved_vifs,
+	list_for_each_entry(link, &ctx->reserved_links,
 			    reserved_chanctx_list) {
 		if (!compat)
-			compat = &sdata->deflink.reserved_chandef;
+			compat = &link->reserved_chandef;
 
-		compat = cfg80211_chandef_compatible(&sdata->deflink.reserved_chandef,
+		compat = cfg80211_chandef_compatible(&link->reserved_chandef,
 						     compat);
 		if (!compat)
 			break;
@@ -108,20 +116,23 @@ ieee80211_chanctx_non_reserved_chandef(struct ieee80211_local *local,
 				       struct ieee80211_chanctx *ctx,
 				       const struct cfg80211_chan_def *compat)
 {
-	struct ieee80211_sub_if_data *sdata;
+	struct ieee80211_link_data *link;
 
 	lockdep_assert_held(&local->chanctx_mtx);
 
-	list_for_each_entry(sdata, &ctx->assigned_vifs,
+	list_for_each_entry(link, &ctx->assigned_links,
 			    assigned_chanctx_list) {
-		if (sdata->deflink.reserved_chanctx != NULL)
+		struct ieee80211_bss_conf *link_conf =
+			link->sdata->vif.link_conf[link->link_id];
+
+		if (link->reserved_chanctx)
 			continue;
 
 		if (!compat)
-			compat = &sdata->vif.bss_conf.chandef;
+			compat = &link_conf->chandef;
 
 		compat = cfg80211_chandef_compatible(
-				&sdata->vif.bss_conf.chandef, compat);
+				&link_conf->chandef, compat);
 		if (!compat)
 			break;
 	}
@@ -157,7 +168,7 @@ ieee80211_chanctx_can_reserve_chandef(struct ieee80211_local *local,
 	if (ieee80211_chanctx_combined_chandef(local, ctx, def))
 		return true;
 
-	if (!list_empty(&ctx->reserved_vifs) &&
+	if (!list_empty(&ctx->reserved_links) &&
 	    ieee80211_chanctx_reserved_chandef(local, ctx, def))
 		return true;
 
@@ -193,13 +204,19 @@ ieee80211_find_reservation_chanctx(struct ieee80211_local *local,
 	return NULL;
 }
 
-static enum nl80211_chan_width ieee80211_get_sta_bw(struct sta_info *sta)
+static enum nl80211_chan_width ieee80211_get_sta_bw(struct sta_info *sta,
+						    unsigned int link_id)
 {
-	enum ieee80211_sta_rx_bandwidth width = ieee80211_sta_cap_rx_bw(sta);
+	enum ieee80211_sta_rx_bandwidth width =
+		ieee80211_sta_cap_rx_bw(sta, link_id);
+
+	/* no effect if this STA has no presence on this link */
+	if (!sta->sta.link[link_id])
+		return NL80211_CHAN_WIDTH_20_NOHT;
 
 	switch (width) {
 	case IEEE80211_STA_RX_BW_20:
-		if (sta->sta.deflink.ht_cap.ht_supported)
+		if (sta->sta.link[link_id]->ht_cap.ht_supported)
 			return NL80211_CHAN_WIDTH_20;
 		else
 			return NL80211_CHAN_WIDTH_20_NOHT;
@@ -227,7 +244,8 @@ static enum nl80211_chan_width ieee80211_get_sta_bw(struct sta_info *sta)
 }
 
 static enum nl80211_chan_width
-ieee80211_get_max_required_bw(struct ieee80211_sub_if_data *sdata)
+ieee80211_get_max_required_bw(struct ieee80211_sub_if_data *sdata,
+			      unsigned int link_id)
 {
 	enum nl80211_chan_width max_bw = NL80211_CHAN_WIDTH_20_NOHT;
 	struct sta_info *sta;
@@ -238,7 +256,7 @@ ieee80211_get_max_required_bw(struct ieee80211_sub_if_data *sdata)
 		    !(sta->sdata->bss && sta->sdata->bss == sdata->bss))
 			continue;
 
-		max_bw = max(max_bw, ieee80211_get_sta_bw(sta));
+		max_bw = max(max_bw, ieee80211_get_sta_bw(sta, link_id));
 	}
 	rcu_read_unlock();
 
@@ -246,27 +264,28 @@ ieee80211_get_max_required_bw(struct ieee80211_sub_if_data *sdata)
 }
 
 static enum nl80211_chan_width
-ieee80211_get_chanctx_max_required_bw(struct ieee80211_local *local,
-				      struct ieee80211_chanctx_conf *conf)
+ieee80211_get_chanctx_vif_max_required_bw(struct ieee80211_sub_if_data *sdata,
+					  struct ieee80211_chanctx_conf *conf)
 {
-	struct ieee80211_sub_if_data *sdata;
 	enum nl80211_chan_width max_bw = NL80211_CHAN_WIDTH_20_NOHT;
+	struct ieee80211_vif *vif = &sdata->vif;
+	int link_id;
 
-	rcu_read_lock();
-	list_for_each_entry_rcu(sdata, &local->interfaces, list) {
-		struct ieee80211_vif *vif = &sdata->vif;
+	for (link_id = 0; link_id < ARRAY_SIZE(sdata->link); link_id++) {
 		enum nl80211_chan_width width = NL80211_CHAN_WIDTH_20_NOHT;
+		struct ieee80211_bss_conf *link_conf =
+			sdata->vif.link_conf[link_id];
 
-		if (!ieee80211_sdata_running(sdata))
+		if (!link_conf)
 			continue;
 
-		if (rcu_access_pointer(sdata->vif.bss_conf.chanctx_conf) != conf)
+		if (rcu_access_pointer(link_conf->chanctx_conf) != conf)
 			continue;
 
 		switch (vif->type) {
 		case NL80211_IFTYPE_AP:
 		case NL80211_IFTYPE_AP_VLAN:
-			width = ieee80211_get_max_required_bw(sdata);
+			width = ieee80211_get_max_required_bw(sdata, link_id);
 			break;
 		case NL80211_IFTYPE_STATION:
 			/*
@@ -274,8 +293,8 @@ ieee80211_get_chanctx_max_required_bw(struct ieee80211_local *local,
 			 * point, so take the width from the chandef, but
 			 * account also for TDLS peers
 			 */
-			width = max(vif->bss_conf.chandef.width,
-				    ieee80211_get_max_required_bw(sdata));
+			width = max(link_conf->chandef.width,
+				    ieee80211_get_max_required_bw(sdata, link_id));
 			break;
 		case NL80211_IFTYPE_P2P_DEVICE:
 		case NL80211_IFTYPE_NAN:
@@ -283,7 +302,7 @@ ieee80211_get_chanctx_max_required_bw(struct ieee80211_local *local,
 		case NL80211_IFTYPE_ADHOC:
 		case NL80211_IFTYPE_MESH_POINT:
 		case NL80211_IFTYPE_OCB:
-			width = vif->bss_conf.chandef.width;
+			width = link_conf->chandef.width;
 			break;
 		case NL80211_IFTYPE_WDS:
 		case NL80211_IFTYPE_UNSPECIFIED:
@@ -293,12 +312,36 @@ ieee80211_get_chanctx_max_required_bw(struct ieee80211_local *local,
 		case NL80211_IFTYPE_P2P_GO:
 			WARN_ON_ONCE(1);
 		}
+
+		max_bw = max(max_bw, width);
+	}
+
+	return max_bw;
+}
+
+static enum nl80211_chan_width
+ieee80211_get_chanctx_max_required_bw(struct ieee80211_local *local,
+				      struct ieee80211_chanctx_conf *conf)
+{
+	struct ieee80211_sub_if_data *sdata;
+	enum nl80211_chan_width max_bw = NL80211_CHAN_WIDTH_20_NOHT;
+
+	rcu_read_lock();
+	list_for_each_entry_rcu(sdata, &local->interfaces, list) {
+		enum nl80211_chan_width width;
+
+		if (!ieee80211_sdata_running(sdata))
+			continue;
+
+		width = ieee80211_get_chanctx_vif_max_required_bw(sdata, conf);
+
 		max_bw = max(max_bw, width);
 	}
 
 	/* use the configured bandwidth in case of monitor interface */
 	sdata = rcu_dereference(local->monitor_sdata);
-	if (sdata && rcu_access_pointer(sdata->vif.bss_conf.chanctx_conf) == conf)
+	if (sdata &&
+	    rcu_access_pointer(sdata->vif.link_conf[0]->chanctx_conf) == conf)
 		max_bw = max(max_bw, conf->def.width);
 
 	rcu_read_unlock();
@@ -350,7 +393,7 @@ static u32 _ieee80211_recalc_chanctx_min_def(struct ieee80211_local *local,
 }
 
 /* calling this function is assuming that station vif is updated to
- * lates changes by calling ieee80211_vif_update_chandef
+ * lates changes by calling ieee80211_link_update_chandef
  */
 static void ieee80211_chan_bw_change(struct ieee80211_local *local,
 				     struct ieee80211_chanctx *ctx,
@@ -363,29 +406,38 @@ static void ieee80211_chan_bw_change(struct ieee80211_local *local,
 	rcu_read_lock();
 	list_for_each_entry_rcu(sta, &local->sta_list,
 				list) {
+		struct ieee80211_sub_if_data *sdata = sta->sdata;
 		enum ieee80211_sta_rx_bandwidth new_sta_bw;
+		unsigned int link_id;
 
 		if (!ieee80211_sdata_running(sta->sdata))
 			continue;
 
-		if (rcu_access_pointer(sta->sdata->vif.bss_conf.chanctx_conf) !=
-		    &ctx->conf)
-			continue;
+		for (link_id = 0; link_id < ARRAY_SIZE(sta->sdata->link); link_id++) {
+			struct ieee80211_bss_conf *link_conf =
+				sdata->vif.link_conf[link_id];
+
+			if (!link_conf)
+				continue;
 
-		new_sta_bw = ieee80211_sta_cur_vht_bw(sta);
+			if (rcu_access_pointer(link_conf->chanctx_conf) != &ctx->conf)
+				continue;
 
-		/* nothing change */
-		if (new_sta_bw == sta->sta.deflink.bandwidth)
-			continue;
+			new_sta_bw = ieee80211_sta_cur_vht_bw(sta, link_id);
 
-		/* vif changed to narrow BW and narrow BW for station wasn't
-		 * requested or vise versa */
-		if ((new_sta_bw < sta->sta.deflink.bandwidth) == !narrowed)
-			continue;
+			/* nothing change */
+			if (new_sta_bw == sta->sta.link[link_id]->bandwidth)
+				continue;
+
+			/* vif changed to narrow BW and narrow BW for station wasn't
+			 * requested or vise versa */
+			if ((new_sta_bw < sta->sta.link[link_id]->bandwidth) == !narrowed)
+				continue;
 
-		sta->sta.deflink.bandwidth = new_sta_bw;
-		rate_control_rate_update(local, sband, sta,
-					 IEEE80211_RC_BW_CHANGED);
+			sta->sta.link[link_id]->bandwidth = new_sta_bw;
+			rate_control_rate_update(local, sband, sta, link_id,
+						 IEEE80211_RC_BW_CHANGED);
+		}
 	}
 	rcu_read_unlock();
 }
@@ -508,9 +560,14 @@ bool ieee80211_is_radar_required(struct ieee80211_local *local)
 
 	rcu_read_lock();
 	list_for_each_entry_rcu(sdata, &local->interfaces, list) {
-		if (sdata->deflink.radar_required) {
-			rcu_read_unlock();
-			return true;
+		unsigned int link_id;
+
+		for (link_id = 0; link_id < ARRAY_SIZE(sdata->link); link_id++) {
+			if (sdata->link[link_id] &&
+			    sdata->link[link_id]->radar_required) {
+				rcu_read_unlock();
+				return true;
+			}
 		}
 	}
 	rcu_read_unlock();
@@ -531,15 +588,27 @@ ieee80211_chanctx_radar_required(struct ieee80211_local *local,
 
 	rcu_read_lock();
 	list_for_each_entry_rcu(sdata, &local->interfaces, list) {
+		unsigned int link_id;
+
 		if (!ieee80211_sdata_running(sdata))
 			continue;
-		if (rcu_access_pointer(sdata->vif.bss_conf.chanctx_conf) != conf)
-			continue;
-		if (!sdata->deflink.radar_required)
-			continue;
+		for (link_id = 0; link_id < ARRAY_SIZE(sdata->link); link_id++) {
+			struct ieee80211_bss_conf *link_conf =
+				sdata->vif.link_conf[link_id];
 
-		required = true;
-		break;
+			if (!link_conf)
+				continue;
+
+			if (rcu_access_pointer(link_conf->chanctx_conf) != conf)
+				continue;
+			if (!sdata->link[link_id]->radar_required)
+				continue;
+			required = true;
+			break;
+		}
+
+		if (required)
+			break;
 	}
 	rcu_read_unlock();
 
@@ -559,8 +628,8 @@ ieee80211_alloc_chanctx(struct ieee80211_local *local,
 	if (!ctx)
 		return NULL;
 
-	INIT_LIST_HEAD(&ctx->assigned_vifs);
-	INIT_LIST_HEAD(&ctx->reserved_vifs);
+	INIT_LIST_HEAD(&ctx->assigned_links);
+	INIT_LIST_HEAD(&ctx->reserved_links);
 	ctx->conf.def = *chandef;
 	ctx->conf.rx_chains_static = 1;
 	ctx->conf.rx_chains_dynamic = 1;
@@ -686,21 +755,32 @@ void ieee80211_recalc_chanctx_chantype(struct ieee80211_local *local,
 
 	rcu_read_lock();
 	list_for_each_entry_rcu(sdata, &local->interfaces, list) {
+		int link_id;
 
 		if (!ieee80211_sdata_running(sdata))
 			continue;
-		if (rcu_access_pointer(sdata->vif.bss_conf.chanctx_conf) != conf)
-			continue;
+
 		if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
 			continue;
 
-		if (!compat)
-			compat = &sdata->vif.bss_conf.chandef;
+		for (link_id = 0; link_id < ARRAY_SIZE(sdata->link); link_id++) {
+			struct ieee80211_bss_conf *link_conf =
+				sdata->vif.link_conf[link_id];
 
-		compat = cfg80211_chandef_compatible(
-				&sdata->vif.bss_conf.chandef, compat);
-		if (WARN_ON_ONCE(!compat))
-			break;
+			if (!link_conf)
+				continue;
+
+			if (rcu_access_pointer(link_conf->chanctx_conf) != conf)
+				continue;
+
+			if (!compat)
+				compat = &link_conf->chandef;
+
+			compat = cfg80211_chandef_compatible(&link_conf->chandef,
+							     compat);
+			if (WARN_ON_ONCE(!compat))
+				break;
+		}
 	}
 
 	/* TDLS peers can sometimes affect the chandef width */
@@ -748,9 +828,11 @@ static void ieee80211_recalc_radar_chanctx(struct ieee80211_local *local,
 	drv_change_chanctx(local, chanctx, IEEE80211_CHANCTX_CHANGE_RADAR);
 }
 
-static int ieee80211_assign_vif_chanctx(struct ieee80211_sub_if_data *sdata,
-					struct ieee80211_chanctx *new_ctx)
+static int ieee80211_assign_link_chanctx(struct ieee80211_link_data *link,
+					 struct ieee80211_chanctx *new_ctx)
 {
+	struct ieee80211_sub_if_data *sdata = link->sdata;
+	unsigned int link_id = link->link_id;
 	struct ieee80211_local *local = sdata->local;
 	struct ieee80211_chanctx_conf *conf;
 	struct ieee80211_chanctx *curr_ctx = NULL;
@@ -759,29 +841,29 @@ static int ieee80211_assign_vif_chanctx(struct ieee80211_sub_if_data *sdata,
 	if (WARN_ON(sdata->vif.type == NL80211_IFTYPE_NAN))
 		return -ENOTSUPP;
 
-	conf = rcu_dereference_protected(sdata->vif.bss_conf.chanctx_conf,
+	conf = rcu_dereference_protected(sdata->vif.link_conf[link_id]->chanctx_conf,
 					 lockdep_is_held(&local->chanctx_mtx));
 
 	if (conf) {
 		curr_ctx = container_of(conf, struct ieee80211_chanctx, conf);
 
-		drv_unassign_vif_chanctx(local, sdata, curr_ctx);
+		drv_unassign_vif_chanctx(local, sdata, link_id, curr_ctx);
 		conf = NULL;
-		list_del(&sdata->assigned_chanctx_list);
+		list_del(&link->assigned_chanctx_list);
 	}
 
 	if (new_ctx) {
-		ret = drv_assign_vif_chanctx(local, sdata, new_ctx);
+		ret = drv_assign_vif_chanctx(local, sdata, link_id, new_ctx);
 		if (ret)
 			goto out;
 
 		conf = &new_ctx->conf;
-		list_add(&sdata->assigned_chanctx_list,
-			 &new_ctx->assigned_vifs);
+		list_add(&link->assigned_chanctx_list,
+			 &new_ctx->assigned_links);
 	}
 
 out:
-	rcu_assign_pointer(sdata->vif.bss_conf.chanctx_conf, conf);
+	rcu_assign_pointer(sdata->vif.link_conf[link_id]->chanctx_conf, conf);
 
 	sdata->vif.cfg.idle = !conf;
 
@@ -820,60 +902,64 @@ void ieee80211_recalc_smps_chanctx(struct ieee80211_local *local,
 	rcu_read_lock();
 	list_for_each_entry_rcu(sdata, &local->interfaces, list) {
 		u8 needed_static, needed_dynamic;
+		unsigned int link_id;
 
 		if (!ieee80211_sdata_running(sdata))
 			continue;
 
-		if (rcu_access_pointer(sdata->vif.bss_conf.chanctx_conf) !=
-						&chanctx->conf)
-			continue;
-
 		switch (sdata->vif.type) {
-		case NL80211_IFTYPE_P2P_DEVICE:
-		case NL80211_IFTYPE_NAN:
-			continue;
 		case NL80211_IFTYPE_STATION:
 			if (!sdata->u.mgd.associated)
 				continue;
 			break;
-		case NL80211_IFTYPE_AP_VLAN:
-			continue;
 		case NL80211_IFTYPE_AP:
 		case NL80211_IFTYPE_ADHOC:
 		case NL80211_IFTYPE_MESH_POINT:
 		case NL80211_IFTYPE_OCB:
 			break;
 		default:
-			WARN_ON_ONCE(1);
+			continue;
 		}
 
-		switch (sdata->deflink.smps_mode) {
-		default:
-			WARN_ONCE(1, "Invalid SMPS mode %d\n",
-				  sdata->deflink.smps_mode);
-			fallthrough;
-		case IEEE80211_SMPS_OFF:
-			needed_static = sdata->deflink.needed_rx_chains;
-			needed_dynamic = sdata->deflink.needed_rx_chains;
-			break;
-		case IEEE80211_SMPS_DYNAMIC:
-			needed_static = 1;
-			needed_dynamic = sdata->deflink.needed_rx_chains;
-			break;
-		case IEEE80211_SMPS_STATIC:
-			needed_static = 1;
-			needed_dynamic = 1;
-			break;
-		}
+		for (link_id = 0; link_id < ARRAY_SIZE(sdata->link); link_id++) {
+			struct ieee80211_link_data *link = sdata->link[link_id];
+			struct ieee80211_bss_conf *link_conf =
+				sdata->vif.link_conf[link_id];
+
+			if (!link_conf)
+				continue;
+
+			if (rcu_access_pointer(link_conf->chanctx_conf) != &chanctx->conf)
+				continue;
+
+			switch (link->smps_mode) {
+			default:
+				WARN_ONCE(1, "Invalid SMPS mode %d\n",
+					  link->smps_mode);
+				fallthrough;
+			case IEEE80211_SMPS_OFF:
+				needed_static = link->needed_rx_chains;
+				needed_dynamic = link->needed_rx_chains;
+				break;
+			case IEEE80211_SMPS_DYNAMIC:
+				needed_static = 1;
+				needed_dynamic = link->needed_rx_chains;
+				break;
+			case IEEE80211_SMPS_STATIC:
+				needed_static = 1;
+				needed_dynamic = 1;
+				break;
+			}
 
-		rx_chains_static = max(rx_chains_static, needed_static);
-		rx_chains_dynamic = max(rx_chains_dynamic, needed_dynamic);
+			rx_chains_static = max(rx_chains_static, needed_static);
+			rx_chains_dynamic = max(rx_chains_dynamic, needed_dynamic);
+		}
 	}
 
 	/* Disable SMPS for the monitor interface */
 	sdata = rcu_dereference(local->monitor_sdata);
 	if (sdata &&
-	    rcu_access_pointer(sdata->vif.bss_conf.chanctx_conf) == &chanctx->conf)
+	    rcu_access_pointer(sdata->vif.link_conf[0]->chanctx_conf) == &chanctx->conf)
 		rx_chains_dynamic = rx_chains_static = local->rx_chains;
 
 	rcu_read_unlock();
@@ -898,9 +984,12 @@ void ieee80211_recalc_smps_chanctx(struct ieee80211_local *local,
 }
 
 static void
-__ieee80211_vif_copy_chanctx_to_vlans(struct ieee80211_sub_if_data *sdata,
-				      bool clear)
+__ieee80211_link_copy_chanctx_to_vlans(struct ieee80211_link_data *link,
+				       bool clear)
 {
+	struct ieee80211_sub_if_data *sdata = link->sdata;
+	unsigned int link_id = link->link_id;
+	struct ieee80211_bss_conf *link_conf = sdata->vif.link_conf[link_id];
 	struct ieee80211_local *local __maybe_unused = sdata->local;
 	struct ieee80211_sub_if_data *vlan;
 	struct ieee80211_chanctx_conf *conf;
@@ -916,7 +1005,7 @@ __ieee80211_vif_copy_chanctx_to_vlans(struct ieee80211_sub_if_data *sdata,
 	 * channel context pointer for a while, possibly pointing
 	 * to a channel context that has already been freed.
 	 */
-	conf = rcu_dereference_protected(sdata->vif.bss_conf.chanctx_conf,
+	conf = rcu_dereference_protected(link_conf->chanctx_conf,
 					 lockdep_is_held(&local->chanctx_mtx));
 	WARN_ON(!conf);
 
@@ -924,32 +1013,34 @@ __ieee80211_vif_copy_chanctx_to_vlans(struct ieee80211_sub_if_data *sdata,
 		conf = NULL;
 
 	list_for_each_entry(vlan, &sdata->u.ap.vlans, u.vlan.list)
-		rcu_assign_pointer(vlan->vif.bss_conf.chanctx_conf, conf);
+		rcu_assign_pointer(vlan->vif.link_conf[link_id]->chanctx_conf,
+				   conf);
 }
 
-void ieee80211_vif_copy_chanctx_to_vlans(struct ieee80211_sub_if_data *sdata,
-					 bool clear)
+void ieee80211_link_copy_chanctx_to_vlans(struct ieee80211_link_data *link,
+					  bool clear)
 {
-	struct ieee80211_local *local = sdata->local;
+	struct ieee80211_local *local = link->sdata->local;
 
 	mutex_lock(&local->chanctx_mtx);
 
-	__ieee80211_vif_copy_chanctx_to_vlans(sdata, clear);
+	__ieee80211_link_copy_chanctx_to_vlans(link, clear);
 
 	mutex_unlock(&local->chanctx_mtx);
 }
 
-int ieee80211_vif_unreserve_chanctx(struct ieee80211_sub_if_data *sdata)
+int ieee80211_link_unreserve_chanctx(struct ieee80211_link_data *link)
 {
-	struct ieee80211_chanctx *ctx = sdata->deflink.reserved_chanctx;
+	struct ieee80211_sub_if_data *sdata = link->sdata;
+	struct ieee80211_chanctx *ctx = link->reserved_chanctx;
 
 	lockdep_assert_held(&sdata->local->chanctx_mtx);
 
 	if (WARN_ON(!ctx))
 		return -EINVAL;
 
-	list_del(&sdata->reserved_chanctx_list);
-	sdata->deflink.reserved_chanctx = NULL;
+	list_del(&link->reserved_chanctx_list);
+	link->reserved_chanctx = NULL;
 
 	if (ieee80211_chanctx_refcount(sdata->local, ctx) == 0) {
 		if (ctx->replace_state == IEEE80211_CHANCTX_REPLACES_OTHER) {
@@ -974,17 +1065,18 @@ int ieee80211_vif_unreserve_chanctx(struct ieee80211_sub_if_data *sdata)
 	return 0;
 }
 
-int ieee80211_vif_reserve_chanctx(struct ieee80211_sub_if_data *sdata,
-				  const struct cfg80211_chan_def *chandef,
-				  enum ieee80211_chanctx_mode mode,
-				  bool radar_required)
+int ieee80211_link_reserve_chanctx(struct ieee80211_link_data *link,
+				   const struct cfg80211_chan_def *chandef,
+				   enum ieee80211_chanctx_mode mode,
+				   bool radar_required)
 {
+	struct ieee80211_sub_if_data *sdata = link->sdata;
 	struct ieee80211_local *local = sdata->local;
 	struct ieee80211_chanctx *new_ctx, *curr_ctx, *ctx;
 
 	lockdep_assert_held(&local->chanctx_mtx);
 
-	curr_ctx = ieee80211_vif_get_chanctx(sdata);
+	curr_ctx = ieee80211_link_get_chanctx(link);
 	if (curr_ctx && local->use_chanctx && !local->ops->switch_vif_chanctx)
 		return -ENOTSUPP;
 
@@ -998,11 +1090,11 @@ int ieee80211_vif_reserve_chanctx(struct ieee80211_sub_if_data *sdata,
 			if (!curr_ctx ||
 			    (curr_ctx->replace_state ==
 			     IEEE80211_CHANCTX_WILL_BE_REPLACED) ||
-			    !list_empty(&curr_ctx->reserved_vifs)) {
+			    !list_empty(&curr_ctx->reserved_links)) {
 				/*
-				 * Another vif already requested this context
+				 * Another link already requested this context
 				 * for a reservation. Find another one hoping
-				 * all vifs assigned to it will also switch
+				 * all links assigned to it will also switch
 				 * soon enough.
 				 *
 				 * TODO: This needs a little more work as some
@@ -1011,13 +1103,13 @@ int ieee80211_vif_reserve_chanctx(struct ieee80211_sub_if_data *sdata,
 				 * provided some channel context juggling was
 				 * performed.
 				 *
-				 * Consider ctx1..3, vif1..6, each ctx has 2
-				 * vifs. vif1 and vif2 from ctx1 request new
+				 * Consider ctx1..3, link1..6, each ctx has 2
+				 * links. link1 and link2 from ctx1 request new
 				 * different chandefs starting 2 in-place
 				 * reserations with ctx4 and ctx5 replacing
-				 * ctx1 and ctx2 respectively. Next vif5 and
-				 * vif6 from ctx3 reserve ctx4. If vif3 and
-				 * vif4 remain on ctx2 as they are then this
+				 * ctx1 and ctx2 respectively. Next link5 and
+				 * link6 from ctx3 reserve ctx4. If link3 and
+				 * link4 remain on ctx2 as they are then this
 				 * fails unless `replace_ctx` from ctx5 is
 				 * replaced with ctx3.
 				 */
@@ -1027,7 +1119,7 @@ int ieee80211_vif_reserve_chanctx(struct ieee80211_sub_if_data *sdata,
 					    IEEE80211_CHANCTX_REPLACE_NONE)
 						continue;
 
-					if (!list_empty(&ctx->reserved_vifs))
+					if (!list_empty(&ctx->reserved_links))
 						continue;
 
 					curr_ctx = ctx;
@@ -1042,7 +1134,7 @@ int ieee80211_vif_reserve_chanctx(struct ieee80211_sub_if_data *sdata,
 			if (!curr_ctx ||
 			    (curr_ctx->replace_state ==
 			     IEEE80211_CHANCTX_WILL_BE_REPLACED) ||
-			    !list_empty(&curr_ctx->reserved_vifs))