mac80211: dont use interface indices in drivers

This patch gets rid of the if_id stuff where possible in favour of
a new per-virtual-interface structure "struct ieee80211_vif". This
structure is located at the end of the per-interface structure and
contains a variable length driver-use data area.

This has two advantages:
 * removes the need to look up interfaces by if_id, this is better
   for working with network namespaces and performance
 * allows drivers to store and retrieve per-interface data without
   having to allocate own lists/hash tables

Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 15 insertions, 30 deletions

diff --git a/net/mac80211/util.c b/net/mac80211/util.c
index adb85dd..15503ca 100644
--- a/net/mac80211/util.c
+++ b/net/mac80211/util.c
@@ -302,44 +302,34 @@ int ieee80211_frame_duration(struct ieee80211_local *local, size_t len,
 }
 
 /* Exported duration function for driver use */
-__le16 ieee80211_generic_frame_duration(struct ieee80211_hw *hw, int if_id,
+__le16 ieee80211_generic_frame_duration(struct ieee80211_hw *hw,
+					struct ieee80211_vif *vif,
 					size_t frame_len, int rate)
 {
 	struct ieee80211_local *local = hw_to_local(hw);
-	struct net_device *bdev = dev_get_by_index(&init_net, if_id);
-	struct ieee80211_sub_if_data *sdata;
+	struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
 	u16 dur;
 	int erp;
 
-	if (unlikely(!bdev))
-		return 0;
-
-	sdata = IEEE80211_DEV_TO_SUB_IF(bdev);
 	erp = ieee80211_is_erp_rate(hw->conf.phymode, rate);
 	dur = ieee80211_frame_duration(local, frame_len, rate,
 		       erp, sdata->flags & IEEE80211_SDATA_SHORT_PREAMBLE);
 
-	dev_put(bdev);
 	return cpu_to_le16(dur);
 }
 EXPORT_SYMBOL(ieee80211_generic_frame_duration);
 
-__le16 ieee80211_rts_duration(struct ieee80211_hw *hw, int if_id,
-			      size_t frame_len,
+__le16 ieee80211_rts_duration(struct ieee80211_hw *hw,
+			      struct ieee80211_vif *vif, size_t frame_len,
 			      const struct ieee80211_tx_control *frame_txctl)
 {
 	struct ieee80211_local *local = hw_to_local(hw);
 	struct ieee80211_rate *rate;
-	struct net_device *bdev = dev_get_by_index(&init_net, if_id);
-	struct ieee80211_sub_if_data *sdata;
+	struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
 	int short_preamble;
 	int erp;
 	u16 dur;
 
-	if (unlikely(!bdev))
-		return 0;
-
-	sdata = IEEE80211_DEV_TO_SUB_IF(bdev);
 	short_preamble = sdata->flags & IEEE80211_SDATA_SHORT_PREAMBLE;
 
 	rate = frame_txctl->rts_rate;
@@ -355,27 +345,22 @@ __le16 ieee80211_rts_duration(struct ieee80211_hw *hw, int if_id,
 	dur += ieee80211_frame_duration(local, 10, rate->rate,
 					erp, short_preamble);
 
-	dev_put(bdev);
 	return cpu_to_le16(dur);
 }
 EXPORT_SYMBOL(ieee80211_rts_duration);
 
-__le16 ieee80211_ctstoself_duration(struct ieee80211_hw *hw, int if_id,
+__le16 ieee80211_ctstoself_duration(struct ieee80211_hw *hw,
+				    struct ieee80211_vif *vif,
 				    size_t frame_len,
 				    const struct ieee80211_tx_control *frame_txctl)
 {
 	struct ieee80211_local *local = hw_to_local(hw);
 	struct ieee80211_rate *rate;
-	struct net_device *bdev = dev_get_by_index(&init_net, if_id);
-	struct ieee80211_sub_if_data *sdata;
+	struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
 	int short_preamble;
 	int erp;
 	u16 dur;
 
-	if (unlikely(!bdev))
-		return 0;
-
-	sdata = IEEE80211_DEV_TO_SUB_IF(bdev);
 	short_preamble = sdata->flags & IEEE80211_SDATA_SHORT_PREAMBLE;
 
 	rate = frame_txctl->rts_rate;
@@ -390,7 +375,6 @@ __le16 ieee80211_ctstoself_duration(struct ieee80211_hw *hw, int if_id,
 						erp, short_preamble);
 	}
 
-	dev_put(bdev);
 	return cpu_to_le16(dur);
 }
 EXPORT_SYMBOL(ieee80211_ctstoself_duration);
@@ -475,10 +459,11 @@ void ieee80211_wake_queues(struct ieee80211_hw *hw)
 }
 EXPORT_SYMBOL(ieee80211_wake_queues);
 
-void ieee80211_iterate_active_interfaces(struct ieee80211_hw *hw,
-					 void (*iterator)(void *data, u8 *mac,
-							  int if_id),
-					 void *data)
+void ieee80211_iterate_active_interfaces(
+	struct ieee80211_hw *hw,
+	void (*iterator)(void *data, u8 *mac,
+			 struct ieee80211_vif *vif),
+	void *data)
 {
 	struct ieee80211_local *local = hw_to_local(hw);
 	struct ieee80211_sub_if_data *sdata;
@@ -501,7 +486,7 @@ void ieee80211_iterate_active_interfaces(struct ieee80211_hw *hw,
 			continue;
 		if (netif_running(sdata->dev))
 			iterator(data, sdata->dev->dev_addr,
-				 sdata->dev->ifindex);
+				 &sdata->vif);
 	}
 
 	rcu_read_unlock();