rt2x00: Add per-interface structure

Rework the interface handling. Delete the interface structure
and replace it with a per-interface structure. This changes the
way rt2x00 handles the active interface drastically.

Copy ieee80211_bss_conf to the this rt2x00_intf structure during
the bss_info_changed() callback function. This will allow us to
reference it later, and removes the requirement for the device flag
SHORT_PREAMBLE flag which is interface specific.

Drivers receive the option to give the maximum number of virtual
interfaces the device can handle. Virtual interface support:
rt2400pci: 1 sta or 1 ap, * monitor interfaces
rt2500pci: 1 sta or 1 ap, * monitor interfaces
rt2500usb: 1 sta or 1 ap, * monitor interfaces
rt61pci: 1 sta or 4 ap, * monitor interfaces
rt73usb: 1 sta or 4 ap, * monitor interfaces

At the moment none of the drivers support AP and STA interfaces
simultaneously, this is a hardware limitation so future support
will be very unlikely.

Each interface structure receives its dedicated beacon entry,
with this we can easily work with beaconing while multiple master
mode interfaces are currently active.

The configuration handlers for the MAC, BSSID and type are
often called together since they all belong to the interface
configuration. Merge the 3 configuration calls and cleanup
the API between rt2x00lib and the drivers. While we are cleaning
up the interface configuration anyway, we might as well clean up
the configuration handler as well.

Signed-off-by: Ivo van Doorn <IvDoorn@gmail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 116 insertions, 91 deletions

diff --git a/drivers/net/wireless/rt2x00/rt2500usb.c b/drivers/net/wireless/rt2x00/rt2500usb.c
index edc16a5fc754..31258ee24ee3 100644
--- a/drivers/net/wireless/rt2x00/rt2500usb.c
+++ b/drivers/net/wireless/rt2x00/rt2500usb.c
@@ -285,70 +285,65 @@ static const struct rt2x00debug rt2500usb_rt2x00debug = {
 /*
  * Configuration handlers.
  */
-static void rt2500usb_config_mac_addr(struct rt2x00_dev *rt2x00dev,
-				      __le32 *mac)
-{
-	rt2500usb_register_multiwrite(rt2x00dev, MAC_CSR2, mac,
-				      (3 * sizeof(__le16)));
-}
-
-static void rt2500usb_config_bssid(struct rt2x00_dev *rt2x00dev,
-				   __le32 *bssid)
-{
-	rt2500usb_register_multiwrite(rt2x00dev, MAC_CSR5, bssid,
-				      (3 * sizeof(__le16)));
-}
-
-static void rt2500usb_config_type(struct rt2x00_dev *rt2x00dev, const int type,
-				  const int tsf_sync)
+static void rt2500usb_config_intf(struct rt2x00_dev *rt2x00dev,
+				  struct rt2x00_intf *intf,
+				  struct rt2x00intf_conf *conf,
+				  const unsigned int flags)
 {
+	unsigned int bcn_preload;
 	u16 reg;
 
-	rt2500usb_register_write(rt2x00dev, TXRX_CSR19, 0);
+	if (flags & CONFIG_UPDATE_TYPE) {
+		rt2500usb_register_write(rt2x00dev, TXRX_CSR19, 0);
 
-	/*
-	 * Enable beacon config
-	 */
-	rt2500usb_register_read(rt2x00dev, TXRX_CSR20, &reg);
-	rt2x00_set_field16(&reg, TXRX_CSR20_OFFSET,
-			   (PREAMBLE + get_duration(IEEE80211_HEADER, 20)) >> 6);
-	if (type == IEEE80211_IF_TYPE_STA)
-		rt2x00_set_field16(&reg, TXRX_CSR20_BCN_EXPECT_WINDOW, 0);
-	else
-		rt2x00_set_field16(&reg, TXRX_CSR20_BCN_EXPECT_WINDOW, 2);
-	rt2500usb_register_write(rt2x00dev, TXRX_CSR20, reg);
+		/*
+		 * Enable beacon config
+		 */
+		bcn_preload = PREAMBLE + get_duration(IEEE80211_HEADER, 20);
+		rt2500usb_register_read(rt2x00dev, TXRX_CSR20, &reg);
+		rt2x00_set_field16(&reg, TXRX_CSR20_OFFSET, bcn_preload >> 6);
+		rt2x00_set_field16(&reg, TXRX_CSR20_BCN_EXPECT_WINDOW,
+				   2 * (conf->type != IEEE80211_IF_TYPE_STA));
+		rt2500usb_register_write(rt2x00dev, TXRX_CSR20, reg);
 
-	/*
-	 * Enable synchronisation.
-	 */
-	rt2500usb_register_read(rt2x00dev, TXRX_CSR18, &reg);
-	rt2x00_set_field16(&reg, TXRX_CSR18_OFFSET, 0);
-	rt2500usb_register_write(rt2x00dev, TXRX_CSR18, reg);
+		/*
+		 * Enable synchronisation.
+		 */
+		rt2500usb_register_read(rt2x00dev, TXRX_CSR18, &reg);
+		rt2x00_set_field16(&reg, TXRX_CSR18_OFFSET, 0);
+		rt2500usb_register_write(rt2x00dev, TXRX_CSR18, reg);
+
+		rt2500usb_register_read(rt2x00dev, TXRX_CSR19, &reg);
+		rt2x00_set_field16(&reg, TXRX_CSR19_TSF_COUNT, 1);
+		rt2x00_set_field16(&reg, TXRX_CSR19_TBCN,
+				   (conf->sync == TSF_SYNC_BEACON));
+		rt2x00_set_field16(&reg, TXRX_CSR19_BEACON_GEN, 0);
+		rt2x00_set_field16(&reg, TXRX_CSR19_TSF_SYNC, conf->sync);
+		rt2500usb_register_write(rt2x00dev, TXRX_CSR19, reg);
+	}
 
-	rt2500usb_register_read(rt2x00dev, TXRX_CSR19, &reg);
-	rt2x00_set_field16(&reg, TXRX_CSR19_TSF_COUNT, 1);
-	rt2x00_set_field16(&reg, TXRX_CSR19_TBCN,
-			   (tsf_sync == TSF_SYNC_BEACON));
-	rt2x00_set_field16(&reg, TXRX_CSR19_BEACON_GEN, 0);
-	rt2x00_set_field16(&reg, TXRX_CSR19_TSF_SYNC, tsf_sync);
-	rt2500usb_register_write(rt2x00dev, TXRX_CSR19, reg);
+	if (flags & CONFIG_UPDATE_MAC)
+		rt2500usb_register_multiwrite(rt2x00dev, MAC_CSR2, conf->mac,
+					      (3 * sizeof(__le16)));
+
+	if (flags & CONFIG_UPDATE_BSSID)
+		rt2500usb_register_multiwrite(rt2x00dev, MAC_CSR5, conf->bssid,
+					      (3 * sizeof(__le16)));
 }
 
-static void rt2500usb_config_preamble(struct rt2x00_dev *rt2x00dev,
-				      const int short_preamble,
-				      const int ack_timeout,
-				      const int ack_consume_time)
+static int rt2500usb_config_preamble(struct rt2x00_dev *rt2x00dev,
+				     const int short_preamble,
+				     const int ack_timeout,
+				     const int ack_consume_time)
 {
 	u16 reg;
 
 	/*
-	 * When in atomic context, reschedule and let rt2x00lib
-	 * call this function again.
+	 * When in atomic context, we should let rt2x00lib
+	 * try this configuration again later.
 	 */
-	if (in_atomic()) {
-		queue_work(rt2x00dev->hw->workqueue, &rt2x00dev->config_work);
-		return;
-	}
+	if (in_atomic())
+		return -EAGAIN;
 
 	rt2500usb_register_read(rt2x00dev, TXRX_CSR1, &reg);
 	rt2x00_set_field16(&reg, TXRX_CSR1_ACK_TIMEOUT, ack_timeout);
@@ -358,6 +353,8 @@ static void rt2500usb_config_preamble(struct rt2x00_dev *rt2x00dev,
 	rt2x00_set_field16(&reg, TXRX_CSR10_AUTORESPOND_PREAMBLE,
 			   !!short_preamble);
 	rt2500usb_register_write(rt2x00dev, TXRX_CSR10, reg);
+
+	return 0;
 }
 
 static void rt2500usb_config_phymode(struct rt2x00_dev *rt2x00dev,
@@ -518,8 +515,8 @@ static void rt2500usb_config_duration(struct rt2x00_dev *rt2x00dev,
 }
 
 static void rt2500usb_config(struct rt2x00_dev *rt2x00dev,
-			     const unsigned int flags,
-			     struct rt2x00lib_conf *libconf)
+			     struct rt2x00lib_conf *libconf,
+			     const unsigned int flags)
 {
 	if (flags & CONFIG_UPDATE_PHYMODE)
 		rt2500usb_config_phymode(rt2x00dev, libconf->phymode,
@@ -626,6 +623,24 @@ static void rt2500usb_link_tuner(struct rt2x00_dev *rt2x00dev)
 	u8 low_bound;
 
 	/*
+	 * Read current r17 value, as well as the sensitivity values
+	 * for the r17 register.
+	 */
+	rt2500usb_bbp_read(rt2x00dev, 17, &r17);
+	rt2x00_eeprom_read(rt2x00dev, EEPROM_BBPTUNE_R17, &r17_sens);
+
+	rt2x00_eeprom_read(rt2x00dev, EEPROM_BBPTUNE_VGC, &vgc_bound);
+	up_bound = rt2x00_get_field16(vgc_bound, EEPROM_BBPTUNE_VGCUPPER);
+	low_bound = rt2x00_get_field16(vgc_bound, EEPROM_BBPTUNE_VGCLOWER);
+
+	/*
+	 * If we are not associated, we should go straight to the
+	 * dynamic CCA tuning.
+	 */
+	if (!rt2x00dev->intf_associated)
+		goto dynamic_cca_tune;
+
+	/*
 	 * Determine the BBP tuning threshold and correctly
 	 * set BBP 24, 25 and 61.
 	 */
@@ -651,13 +666,6 @@ static void rt2500usb_link_tuner(struct rt2x00_dev *rt2x00dev)
 	rt2500usb_bbp_write(rt2x00dev, 61, r61);
 
 	/*
-	 * Read current r17 value, as well as the sensitivity values
-	 * for the r17 register.
-	 */
-	rt2500usb_bbp_read(rt2x00dev, 17, &r17);
-	rt2x00_eeprom_read(rt2x00dev, EEPROM_BBPTUNE_R17, &r17_sens);
-
-	/*
 	 * A too low RSSI will cause too much false CCA which will
 	 * then corrupt the R17 tuning. To remidy this the tuning should
 	 * be stopped (While making sure the R17 value will not exceed limits)
@@ -692,14 +700,9 @@ static void rt2500usb_link_tuner(struct rt2x00_dev *rt2x00dev)
 	 * Leave short or middle distance condition, restore r17
 	 * to the dynamic tuning range.
 	 */
-	rt2x00_eeprom_read(rt2x00dev, EEPROM_BBPTUNE_VGC, &vgc_bound);
-	vgc_bound = rt2x00_get_field16(vgc_bound, EEPROM_BBPTUNE_VGCUPPER);
-
 	low_bound = 0x32;
-	if (rssi >= -77)
-		up_bound = vgc_bound;
-	else
-		up_bound = vgc_bound - (-77 - rssi);
+	if (rssi < -77)
+		up_bound -= (-77 - rssi);
 
 	if (up_bound < low_bound)
 		up_bound = low_bound;
@@ -707,7 +710,16 @@ static void rt2500usb_link_tuner(struct rt2x00_dev *rt2x00dev)
 	if (r17 > up_bound) {
 		rt2500usb_bbp_write(rt2x00dev, 17, up_bound);
 		rt2x00dev->link.vgc_level = up_bound;
-	} else if (rt2x00dev->link.qual.false_cca > 512 && r17 < up_bound) {
+		return;
+	}
+
+dynamic_cca_tune:
+
+	/*
+	 * R17 is inside the dynamic tuning range,
+	 * start tuning the link based on the false cca counter.
+	 */
+	if (rt2x00dev->link.qual.false_cca > 512 && r17 < up_bound) {
 		rt2500usb_bbp_write(rt2x00dev, 17, ++r17);
 		rt2x00dev->link.vgc_level = r17;
 	} else if (rt2x00dev->link.qual.false_cca < 100 && r17 > low_bound) {
@@ -1203,6 +1215,7 @@ static int rt2500usb_validate_eeprom(struct rt2x00_dev *rt2x00dev)
 {
 	u16 word;
 	u8 *mac;
+	u8 bbp;
 
 	rt2x00usb_eeprom_read(rt2x00dev, rt2x00dev->eeprom, EEPROM_SIZE);
 
@@ -1257,9 +1270,17 @@ static int rt2500usb_validate_eeprom(struct rt2x00_dev *rt2x00dev)
 		EEPROM(rt2x00dev, "BBPtune: 0x%04x\n", word);
 	}
 
+	/*
+	 * Switch lower vgc bound to current BBP R17 value,
+	 * lower the value a bit for better quality.
+	 */
+	rt2500usb_bbp_read(rt2x00dev, 17, &bbp);
+	bbp -= 6;
+
 	rt2x00_eeprom_read(rt2x00dev, EEPROM_BBPTUNE_VGC, &word);
 	if (word == 0xffff) {
 		rt2x00_set_field16(&word, EEPROM_BBPTUNE_VGCUPPER, 0x40);
+		rt2x00_set_field16(&word, EEPROM_BBPTUNE_VGCLOWER, bbp);
 		rt2x00_eeprom_write(rt2x00dev, EEPROM_BBPTUNE_VGC, word);
 		EEPROM(rt2x00dev, "BBPtune vgc: 0x%04x\n", word);
 	}
@@ -1270,6 +1291,9 @@ static int rt2500usb_validate_eeprom(struct rt2x00_dev *rt2x00dev)
 		rt2x00_set_field16(&word, EEPROM_BBPTUNE_R17_HIGH, 0x41);
 		rt2x00_eeprom_write(rt2x00dev, EEPROM_BBPTUNE_R17, word);
 		EEPROM(rt2x00dev, "BBPtune r17: 0x%04x\n", word);
+	} else {
+		rt2x00_set_field16(&word, EEPROM_BBPTUNE_VGCLOWER, bbp);
+		rt2x00_eeprom_write(rt2x00dev, EEPROM_BBPTUNE_VGC, word);
 	}
 
 	rt2x00_eeprom_read(rt2x00dev, EEPROM_BBPTUNE_R24, &word);
@@ -1705,40 +1729,40 @@ static int rt2500usb_beacon_update(struct ieee80211_hw *hw,
 {
 	struct rt2x00_dev *rt2x00dev = hw->priv;
 	struct usb_device *usb_dev = rt2x00dev_usb_dev(rt2x00dev);
+	struct rt2x00_intf *intf = vif_to_intf(control->vif);
 	struct queue_entry_priv_usb_bcn *priv_bcn;
 	struct skb_frame_desc *skbdesc;
-	struct data_queue *queue;
-	struct queue_entry *entry;
 	int pipe = usb_sndbulkpipe(usb_dev, 1);
 	int length;
 
-	/*
-	 * Just in case the ieee80211 doesn't set this,
-	 * but we need this queue set for the descriptor
-	 * initialization.
-	 */
-	control->queue = IEEE80211_TX_QUEUE_BEACON;
-	queue = rt2x00queue_get_queue(rt2x00dev, control->queue);
-	entry = rt2x00queue_get_entry(queue, Q_INDEX);
-	priv_bcn = entry->priv_data;
+	if (unlikely(!intf->beacon))
+		return -ENOBUFS;
+
+	priv_bcn = intf->beacon->priv_data;
 
 	/*
 	 * Add the descriptor in front of the skb.
 	 */
-	skb_push(skb, queue->desc_size);
-	memset(skb->data, 0, queue->desc_size);
+	skb_push(skb, intf->beacon->queue->desc_size);
+	memset(skb->data, 0, intf->beacon->queue->desc_size);
 
 	/*
 	 * Fill in skb descriptor
 	 */
 	skbdesc = get_skb_frame_desc(skb);
 	memset(skbdesc, 0, sizeof(*skbdesc));
-	skbdesc->data = skb->data + queue->desc_size;
-	skbdesc->data_len = queue->data_size;
+	skbdesc->data = skb->data + intf->beacon->queue->desc_size;
+	skbdesc->data_len = skb->len - intf->beacon->queue->desc_size;
 	skbdesc->desc = skb->data;
-	skbdesc->desc_len = queue->desc_size;
-	skbdesc->entry = entry;
+	skbdesc->desc_len = intf->beacon->queue->desc_size;
+	skbdesc->entry = intf->beacon;
 
+	/*
+	 * Just in case mac80211 doesn't set this correctly,
+	 * but we need this queue set for the descriptor
+	 * initialization.
+	 */
+	control->queue = IEEE80211_TX_QUEUE_BEACON;
 	rt2x00lib_write_tx_desc(rt2x00dev, skb, control);
 
 	/*
@@ -1749,7 +1773,8 @@ static int rt2500usb_beacon_update(struct ieee80211_hw *hw,
 	length = rt2500usb_get_tx_data_len(rt2x00dev, skb);
 
 	usb_fill_bulk_urb(priv_bcn->urb, usb_dev, pipe,
-			  skb->data, length, rt2500usb_beacondone, entry);
+			  skb->data, length, rt2500usb_beacondone,
+			  intf->beacon);
 
 	/*
 	 * Second we need to create the guardian byte.
@@ -1759,7 +1784,7 @@ static int rt2500usb_beacon_update(struct ieee80211_hw *hw,
 	priv_bcn->guardian_data = 0;
 	usb_fill_bulk_urb(priv_bcn->guardian_urb, usb_dev, pipe,
 			  &priv_bcn->guardian_data, 1, rt2500usb_beacondone,
-			  entry);
+			  intf->beacon);
 
 	/*
 	 * Send out the guardian byte.
@@ -1769,7 +1794,7 @@ static int rt2500usb_beacon_update(struct ieee80211_hw *hw,
 	/*
 	 * Enable beacon generation.
 	 */
-	rt2500usb_kick_tx_queue(rt2x00dev, IEEE80211_TX_QUEUE_BEACON);
+	rt2500usb_kick_tx_queue(rt2x00dev, control->queue);
 
 	return 0;
 }
@@ -1805,9 +1830,7 @@ static const struct rt2x00lib_ops rt2500usb_rt2x00_ops = {
 	.get_tx_data_len	= rt2500usb_get_tx_data_len,
 	.kick_tx_queue		= rt2500usb_kick_tx_queue,
 	.fill_rxdone		= rt2500usb_fill_rxdone,
-	.config_mac_addr	= rt2500usb_config_mac_addr,
-	.config_bssid		= rt2500usb_config_bssid,
-	.config_type		= rt2500usb_config_type,
+	.config_intf		= rt2500usb_config_intf,
 	.config_preamble	= rt2500usb_config_preamble,
 	.config			= rt2500usb_config,
 };
@@ -1842,6 +1865,8 @@ static const struct data_queue_desc rt2500usb_queue_atim = {
 
 static const struct rt2x00_ops rt2500usb_ops = {
 	.name		= KBUILD_MODNAME,
+	.max_sta_intf	= 1,
+	.max_ap_intf	= 1,
 	.eeprom_size	= EEPROM_SIZE,
 	.rf_size	= RF_SIZE,
 	.rx		= &rt2500usb_queue_rx,