rt2x00: Refactor beacon code to make use of start- and stop_queue

This patch allows to dynamically remove beaconing interfaces without
shutting beaconing down on all interfaces.

The only place to start and stop beaconing are now the start- and
stop_queue callbacks. Hence, we can remove some register writes during
interface bring up (config_intf) and only write the correct sync mode
to the register there.

When multiple beaconing interfaces are present we should enable
beaconing as soon as mac80211 enables beaconing on at least one of
them. The beacon queue gets stopped when the last beaconing
interface was stopped by mac80211. Therefore, introduce another
interface counter to keep track ot the number of enabled beaconing
interfaces and start or stop the beacon queue accordingly.

To allow single interfaces to stop beaconing, add a new driver
callback clear_beacon to clear a single interface's beacon without
affecting the other interfaces. Don't overload the clear_entry callback
for clearing beacons as that would introduce additional overhead
(check for each TX queue) into the clear_entry callback which is used
on the drivers TX/RX hotpaths.

Furthermore, the write beacon callback doesn't need to enable beaconing
anymore but since beaconing should be disabled while a new beacon is
written or cleared we still disable beacon generation and enable it
afterwards again in the driver specific callbacks. However, beacon
related interrupts should not be disabled/enabled here, that's solely
done from the start- and stop queue callbacks. It would be nice to stop
the beacon queue just before the beacon update and enable it afterwards
in rt2x00queue itself instead of the current implementation that relies
on the driver doing the right thing. However, since start- and
stop_queue are mutex protected we cannot use them for atomic beacon
updates.

Signed-off-by: Helmut Schaa <helmut.schaa@googlemail.com>
Acked-by: Gertjan van Wingerde <gwingerde@gmail.com>
Signed-off-by: Ivo van Doorn <IvDoorn@gmail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 28 insertions, 14 deletions

diff --git a/drivers/net/wireless/rt2x00/rt73usb.c b/drivers/net/wireless/rt2x00/rt73usb.c
index 029be3c6c030..330353ec5c96 100644
--- a/drivers/net/wireless/rt2x00/rt73usb.c
+++ b/drivers/net/wireless/rt2x00/rt73usb.c
@@ -502,26 +502,14 @@ static void rt73usb_config_intf(struct rt2x00_dev *rt2x00dev,
 				struct rt2x00intf_conf *conf,
 				const unsigned int flags)
 {
-	unsigned int beacon_base;
 	u32 reg;
 
 	if (flags & CONFIG_UPDATE_TYPE) {
 		/*
-		 * Clear current synchronisation setup.
-		 * For the Beacon base registers we only need to clear
-		 * the first byte since that byte contains the VALID and OWNER
-		 * bits which (when set to 0) will invalidate the entire beacon.
-		 */
-		beacon_base = HW_BEACON_OFFSET(intf->beacon->entry_idx);
-		rt2x00usb_register_write(rt2x00dev, beacon_base, 0);
-
-		/*
 		 * Enable synchronisation.
 		 */
 		rt2x00usb_register_read(rt2x00dev, TXRX_CSR9, &reg);
-		rt2x00_set_field32(&reg, TXRX_CSR9_TSF_TICKING, 1);
 		rt2x00_set_field32(&reg, TXRX_CSR9_TSF_SYNC, conf->sync);
-		rt2x00_set_field32(&reg, TXRX_CSR9_TBTT_ENABLE, 1);
 		rt2x00usb_register_write(rt2x00dev, TXRX_CSR9, reg);
 	}
 
@@ -1590,8 +1578,6 @@ static void rt73usb_write_beacon(struct queue_entry *entry,
 	 */
 	rt2x00usb_register_write(rt2x00dev, TXRX_CSR10, 0x00001008);
 
-	rt2x00_set_field32(&reg, TXRX_CSR9_TSF_TICKING, 1);
-	rt2x00_set_field32(&reg, TXRX_CSR9_TBTT_ENABLE, 1);
 	rt2x00_set_field32(&reg, TXRX_CSR9_BEACON_GEN, 1);
 	rt2x00usb_register_write(rt2x00dev, TXRX_CSR9, reg);
 
@@ -1602,6 +1588,33 @@ static void rt73usb_write_beacon(struct queue_entry *entry,
 	entry->skb = NULL;
 }
 
+static void rt73usb_clear_beacon(struct queue_entry *entry)
+{
+	struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev;
+	unsigned int beacon_base;
+	u32 reg;
+
+	/*
+	 * Disable beaconing while we are reloading the beacon data,
+	 * otherwise we might be sending out invalid data.
+	 */
+	rt2x00usb_register_read(rt2x00dev, TXRX_CSR9, &reg);
+	rt2x00_set_field32(&reg, TXRX_CSR9_BEACON_GEN, 0);
+	rt2x00usb_register_write(rt2x00dev, TXRX_CSR9, reg);
+
+	/*
+	 * Clear beacon.
+	 */
+	beacon_base = HW_BEACON_OFFSET(entry->entry_idx);
+	rt2x00usb_register_write(rt2x00dev, beacon_base, 0);
+
+	/*
+	 * Enable beaconing again.
+	 */
+	rt2x00_set_field32(&reg, TXRX_CSR9_BEACON_GEN, 1);
+	rt2x00usb_register_write(rt2x00dev, TXRX_CSR9, reg);
+}
+
 static int rt73usb_get_tx_data_len(struct queue_entry *entry)
 {
 	int length;
@@ -2313,6 +2326,7 @@ static const struct rt2x00lib_ops rt73usb_rt2x00_ops = {
 	.flush_queue		= rt2x00usb_flush_queue,
 	.write_tx_desc		= rt73usb_write_tx_desc,
 	.write_beacon		= rt73usb_write_beacon,
+	.clear_beacon		= rt73usb_clear_beacon,
 	.get_tx_data_len	= rt73usb_get_tx_data_len,
 	.fill_rxdone		= rt73usb_fill_rxdone,
 	.config_shared_key	= rt73usb_config_shared_key,