mac80211: use channel contexts

Instead of operating on a single channel only,
use the new channel context infrastructure in
all mac80211 code.

This enables drivers that want to use the new
channel context infrastructure to use multiple
channels, while nothing should change for all
the other drivers that don't support it.

Right now this disables both TX power settings
and spatial multiplexing powersave. Both need
to be re-enabled on a channel context basis.

Additionally, when channel contexts are used
drop the connection when channel switch is
received rather than trying to handle it. This
will have to be improved later.

[With fixes from Eliad and Emmanuel incorporated]
Signed-off-by: Eliad Peller <eliad@wizery.com>
Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

1 files changed, 32 insertions, 9 deletions

diff --git a/net/mac80211/mesh.c b/net/mac80211/mesh.c
index ff0296c7bab..19725e0a051 100644
--- a/net/mac80211/mesh.c
+++ b/net/mac80211/mesh.c
@@ -97,7 +97,7 @@ bool mesh_matches_local(struct ieee80211_sub_if_data *sdata,
 	     (ifmsh->mesh_auth_id == ie->mesh_config->meshconf_auth)))
 		goto mismatch;
 
-	ieee80211_sta_get_rates(local, ie, local->oper_channel->band,
+	ieee80211_sta_get_rates(local, ie, ieee80211_get_sdata_band(sdata),
 				&basic_rates);
 
 	if (sdata->vif.bss_conf.basic_rates != basic_rates)
@@ -355,12 +355,22 @@ int mesh_add_ds_params_ie(struct sk_buff *skb,
 {
 	struct ieee80211_local *local = sdata->local;
 	struct ieee80211_supported_band *sband;
-	struct ieee80211_channel *chan = local->oper_channel;
+	struct ieee80211_chanctx_conf *chanctx_conf;
+	struct ieee80211_channel *chan;
 	u8 *pos;
 
 	if (skb_tailroom(skb) < 3)
 		return -ENOMEM;
 
+	rcu_read_lock();
+	chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
+	if (WARN_ON(!chanctx_conf)) {
+		rcu_read_unlock();
+		return -EINVAL;
+	}
+	chan = chanctx_conf->channel;
+	rcu_read_unlock();
+
 	sband = local->hw.wiphy->bands[chan->band];
 	if (sband->band == IEEE80211_BAND_2GHZ) {
 		pos = skb_put(skb, 2 + 1);
@@ -376,10 +386,11 @@ int mesh_add_ht_cap_ie(struct sk_buff *skb,
 		       struct ieee80211_sub_if_data *sdata)
 {
 	struct ieee80211_local *local = sdata->local;
+	enum ieee80211_band band = ieee80211_get_sdata_band(sdata);
 	struct ieee80211_supported_band *sband;
 	u8 *pos;
 
-	sband = local->hw.wiphy->bands[local->oper_channel->band];
+	sband = local->hw.wiphy->bands[band];
 	if (!sband->ht_cap.ht_supported ||
 	    sdata->vif.bss_conf.channel_type == NL80211_CHAN_NO_HT)
 		return 0;
@@ -397,14 +408,26 @@ int mesh_add_ht_oper_ie(struct sk_buff *skb,
 			struct ieee80211_sub_if_data *sdata)
 {
 	struct ieee80211_local *local = sdata->local;
-	struct ieee80211_channel *channel = local->oper_channel;
+	struct ieee80211_chanctx_conf *chanctx_conf;
+	struct ieee80211_channel *channel;
 	enum nl80211_channel_type channel_type =
-				sdata->vif.bss_conf.channel_type;
-	struct ieee80211_supported_band *sband =
-				local->hw.wiphy->bands[channel->band];
-	struct ieee80211_sta_ht_cap *ht_cap = &sband->ht_cap;
+		sdata->vif.bss_conf.channel_type;
+	struct ieee80211_supported_band *sband;
+	struct ieee80211_sta_ht_cap *ht_cap;
 	u8 *pos;
 
+	rcu_read_lock();
+	chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
+	if (WARN_ON(!chanctx_conf)) {
+		rcu_read_unlock();
+		return -EINVAL;
+	}
+	channel = chanctx_conf->channel;
+	rcu_read_unlock();
+
+	sband = local->hw.wiphy->bands[channel->band];
+	ht_cap = &sband->ht_cap;
+
 	if (!ht_cap->ht_supported || channel_type == NL80211_CHAN_NO_HT)
 		return 0;
 
@@ -610,7 +633,7 @@ void ieee80211_start_mesh(struct ieee80211_sub_if_data *sdata)
 	sdata->vif.bss_conf.beacon_int = MESH_DEFAULT_BEACON_INTERVAL;
 	sdata->vif.bss_conf.basic_rates =
 		ieee80211_mandatory_rates(sdata->local,
-					  sdata->local->oper_channel->band);
+					  ieee80211_get_sdata_band(sdata));
 	ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON |
 						BSS_CHANGED_BEACON_ENABLED |
 						BSS_CHANGED_HT |