mac80211: add unified BSS configuration

This patch (based on Ron Rindjunsky's) creates a framework for
a unified way to pass BSS configuration to drivers that require
the information, e.g. for implementing power save mode.

This patch introduces new ieee80211_bss_conf structure that is
passed to the driver via the new bss_info_changed() callback
when the BSS configuration changes.

This new BSS configuration infrastructure adds the following
new features:
 * drivers are notified of their association AID
 * drivers are notified of association status

and replaces the erp_ie_changed() callback. The patch also does
the relevant driver updates for the latter change.

Signed-off-by: Ron Rindjunsky <ron.rindjunsky@intel.com>
Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/drivers/net/wireless/rt2x00/rt2400pci.c b/drivers/net/wireless/rt2x00/rt2400pci.c
index f4d0c77..d6cba13 100644
--- a/drivers/net/wireless/rt2x00/rt2400pci.c
+++ b/drivers/net/wireless/rt2x00/rt2400pci.c
@@ -1524,7 +1524,7 @@
 	.configure_filter	= rt2400pci_configure_filter,
 	.get_stats		= rt2x00mac_get_stats,
 	.set_retry_limit	= rt2400pci_set_retry_limit,
-	.erp_ie_changed		= rt2x00mac_erp_ie_changed,
+	.bss_info_changed	= rt2x00mac_bss_info_changed,
 	.conf_tx		= rt2400pci_conf_tx,
 	.get_tx_stats		= rt2x00mac_get_tx_stats,
 	.get_tsf		= rt2400pci_get_tsf,
diff --git a/drivers/net/wireless/rt2x00/rt2500pci.c b/drivers/net/wireless/rt2x00/rt2500pci.c
index 206b50f..e874fdc 100644
--- a/drivers/net/wireless/rt2x00/rt2500pci.c
+++ b/drivers/net/wireless/rt2x00/rt2500pci.c
@@ -1835,7 +1835,7 @@
 	.configure_filter	= rt2500pci_configure_filter,
 	.get_stats		= rt2x00mac_get_stats,
 	.set_retry_limit	= rt2500pci_set_retry_limit,
-	.erp_ie_changed		= rt2x00mac_erp_ie_changed,
+	.bss_info_changed	= rt2x00mac_bss_info_changed,
 	.conf_tx		= rt2x00mac_conf_tx,
 	.get_tx_stats		= rt2x00mac_get_tx_stats,
 	.get_tsf		= rt2500pci_get_tsf,
diff --git a/drivers/net/wireless/rt2x00/rt2500usb.c b/drivers/net/wireless/rt2x00/rt2500usb.c
index 6579718..1933113 100644
--- a/drivers/net/wireless/rt2x00/rt2500usb.c
+++ b/drivers/net/wireless/rt2x00/rt2500usb.c
@@ -1776,7 +1776,7 @@
 	.config_interface	= rt2x00mac_config_interface,
 	.configure_filter	= rt2500usb_configure_filter,
 	.get_stats		= rt2x00mac_get_stats,
-	.erp_ie_changed		= rt2x00mac_erp_ie_changed,
+	.bss_info_changed	= rt2x00mac_bss_info_changed,
 	.conf_tx		= rt2x00mac_conf_tx,
 	.get_tx_stats		= rt2x00mac_get_tx_stats,
 	.beacon_update		= rt2500usb_beacon_update,
diff --git a/drivers/net/wireless/rt2x00/rt2x00.h b/drivers/net/wireless/rt2x00/rt2x00.h
index 94a8a7c..05927b9 100644
--- a/drivers/net/wireless/rt2x00/rt2x00.h
+++ b/drivers/net/wireless/rt2x00/rt2x00.h
@@ -936,8 +936,10 @@
 			struct ieee80211_low_level_stats *stats);
 int rt2x00mac_get_tx_stats(struct ieee80211_hw *hw,
 			   struct ieee80211_tx_queue_stats *stats);
-void rt2x00mac_erp_ie_changed(struct ieee80211_hw *hw, u8 changes,
-			      int cts_protection, int preamble);
+void rt2x00mac_bss_info_changed(struct ieee80211_hw *hw,
+				struct ieee80211_vif *vif,
+				struct ieee80211_bss_conf *bss_conf,
+				u32 changes);
 int rt2x00mac_conf_tx(struct ieee80211_hw *hw, int queue,
 		      const struct ieee80211_tx_queue_params *params);
 
diff --git a/drivers/net/wireless/rt2x00/rt2x00dev.c b/drivers/net/wireless/rt2x00/rt2x00dev.c
index b26c634..72cfe6f 100644
--- a/drivers/net/wireless/rt2x00/rt2x00dev.c
+++ b/drivers/net/wireless/rt2x00/rt2x00dev.c
@@ -481,10 +481,17 @@
 {
 	struct rt2x00_dev *rt2x00dev =
 	    container_of(work, struct rt2x00_dev, config_work);
-	int preamble = !test_bit(CONFIG_SHORT_PREAMBLE, &rt2x00dev->flags);
+	struct ieee80211_bss_conf bss_conf;
 
-	rt2x00mac_erp_ie_changed(rt2x00dev->hw,
-				 IEEE80211_ERP_CHANGE_PREAMBLE, 0, preamble);
+	bss_conf.use_short_preamble =
+		test_bit(CONFIG_SHORT_PREAMBLE, &rt2x00dev->flags);
+
+	/*
+	 * FIXME: shouldn't invoke it this way because all other contents
+	 *	  of bss_conf is invalid.
+	 */
+	rt2x00mac_bss_info_changed(rt2x00dev->hw, rt2x00dev->interface.id,
+				   &bss_conf, BSS_CHANGED_ERP_PREAMBLE);
 }
 
 /*
diff --git a/drivers/net/wireless/rt2x00/rt2x00mac.c b/drivers/net/wireless/rt2x00/rt2x00mac.c
index 1d67bcd..e3f15e5 100644
--- a/drivers/net/wireless/rt2x00/rt2x00mac.c
+++ b/drivers/net/wireless/rt2x00/rt2x00mac.c
@@ -342,23 +342,27 @@
 }
 EXPORT_SYMBOL_GPL(rt2x00mac_get_tx_stats);
 
-void rt2x00mac_erp_ie_changed(struct ieee80211_hw *hw, u8 changes,
-			      int cts_protection, int preamble)
+void rt2x00mac_bss_info_changed(struct ieee80211_hw *hw,
+				struct ieee80211_vif *vif,
+				struct ieee80211_bss_conf *bss_conf,
+				u32 changes)
 {
 	struct rt2x00_dev *rt2x00dev = hw->priv;
 	int short_preamble;
 	int ack_timeout;
 	int ack_consume_time;
 	int difs;
+	int preamble;
 
 	/*
 	 * We only support changing preamble mode.
 	 */
-	if (!(changes & IEEE80211_ERP_CHANGE_PREAMBLE))
+	if (!(changes & BSS_CHANGED_ERP_PREAMBLE))
 		return;
 
-	short_preamble = !preamble;
-	preamble = !!(preamble) ? PREAMBLE : SHORT_PREAMBLE;
+	short_preamble = bss_conf->use_short_preamble;
+	preamble = bss_conf->use_short_preamble ?
+				SHORT_PREAMBLE : PREAMBLE;
 
 	difs = (hw->conf.flags & IEEE80211_CONF_SHORT_SLOT_TIME) ?
 		SHORT_DIFS : DIFS;
@@ -374,7 +378,7 @@
 	rt2x00dev->ops->lib->config_preamble(rt2x00dev, short_preamble,
 					     ack_timeout, ack_consume_time);
 }
-EXPORT_SYMBOL_GPL(rt2x00mac_erp_ie_changed);
+EXPORT_SYMBOL_GPL(rt2x00mac_bss_info_changed);
 
 int rt2x00mac_conf_tx(struct ieee80211_hw *hw, int queue,
 		      const struct ieee80211_tx_queue_params *params)
diff --git a/drivers/net/wireless/rt2x00/rt61pci.c b/drivers/net/wireless/rt2x00/rt61pci.c
index 88d1698..ab52f22 100644
--- a/drivers/net/wireless/rt2x00/rt61pci.c
+++ b/drivers/net/wireless/rt2x00/rt61pci.c
@@ -2441,7 +2441,7 @@
 	.configure_filter	= rt61pci_configure_filter,
 	.get_stats		= rt2x00mac_get_stats,
 	.set_retry_limit	= rt61pci_set_retry_limit,
-	.erp_ie_changed		= rt2x00mac_erp_ie_changed,
+	.bss_info_changed	= rt2x00mac_bss_info_changed,
 	.conf_tx		= rt2x00mac_conf_tx,
 	.get_tx_stats		= rt2x00mac_get_tx_stats,
 	.get_tsf		= rt61pci_get_tsf,
diff --git a/drivers/net/wireless/rt2x00/rt73usb.c b/drivers/net/wireless/rt2x00/rt73usb.c
index 47ed307..f951876 100644
--- a/drivers/net/wireless/rt2x00/rt73usb.c
+++ b/drivers/net/wireless/rt2x00/rt73usb.c
@@ -2024,7 +2024,7 @@
 	.configure_filter	= rt73usb_configure_filter,
 	.get_stats		= rt2x00mac_get_stats,
 	.set_retry_limit	= rt73usb_set_retry_limit,
-	.erp_ie_changed		= rt2x00mac_erp_ie_changed,
+	.bss_info_changed	= rt2x00mac_bss_info_changed,
 	.conf_tx		= rt2x00mac_conf_tx,
 	.get_tx_stats		= rt2x00mac_get_tx_stats,
 	.get_tsf		= rt73usb_get_tsf,