mac80211: track needed RX chains for channel contexts

On each channel that the device is operating on, it
may need to listen using one or more chains depending
on the SMPS settings of the interfaces using it. The
previous channel context changes completely removed
this ability (before, it was available as the SMPS
mode).

Add per-context tracking of the required static and
dynamic RX chains and notify the driver on changes.
To achieve this, track the chains and SMPS mode used
on each virtual interface and update the channel
context whenever this changes.

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

1 files changed, 10 insertions, 0 deletions

diff --git a/net/mac80211/iface.c b/net/mac80211/iface.c
index 7cb8382b19e5..99f2b19c8f0d 100644
--- a/net/mac80211/iface.c
+++ b/net/mac80211/iface.c
@@ -739,6 +739,8 @@ static void ieee80211_do_stop(struct ieee80211_sub_if_data *sdata,
         del_timer_sync(&local->dynamic_ps_timer);
         cancel_work_sync(&local->dynamic_ps_enable_work);
 
+        cancel_work_sync(&sdata->recalc_smps);
+
         /* APs need special treatment */
         if (sdata->vif.type == NL80211_IFTYPE_AP) {
                 struct ieee80211_sub_if_data *vlan, *tmpsdata;
@@ -1125,6 +1127,13 @@ static void ieee80211_iface_work(struct work_struct *work)
         }
 }
 
+static void ieee80211_recalc_smps_work(struct work_struct *work)
+{
+        struct ieee80211_sub_if_data *sdata =
+                container_of(work, struct ieee80211_sub_if_data, recalc_smps);
+
+        ieee80211_recalc_smps(sdata);
+}
 
 /*
  * Helper function to initialise an interface to a specific type.
@@ -1153,6 +1162,7 @@ static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata,
 
         skb_queue_head_init(&sdata->skb_queue);
         INIT_WORK(&sdata->work, ieee80211_iface_work);
+        INIT_WORK(&sdata->recalc_smps, ieee80211_recalc_smps_work);
 
         switch (type) {
         case NL80211_IFTYPE_P2P_GO: