rt2x00: Cleanup TX/RX entry handling

Merge the callback functions init_txentry() and
init_rxentry(). This makes life in rt2x00lib a
lot simpler and we can cleanup several functions.

rt2x00pci contained "fake" FIELD definitions for
descriptor words. This is not flexible since it
assumes the driver will always have the same field
to indicate if a driver is available or not.
This should be dependent on the driver, and we
should add a callback function for this.

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

drivers/net/wireless/rt2x00/rt2400pci.c

@@ -626,36 +626,47 @@ static void rt2400pci_link_tuner(struct rt2x00_dev *rt2x00dev)
 /*
  * Initialization functions.
  */
-static void rt2400pci_init_rxentry(struct rt2x00_dev *rt2x00dev,
-				   struct queue_entry *entry)
+static bool rt2400pci_get_entry_state(struct queue_entry *entry)
 {
 	struct queue_entry_priv_pci *entry_priv = entry->priv_data;
-	struct skb_frame_desc *skbdesc = get_skb_frame_desc(entry->skb);
 	u32 word;
 
-	rt2x00_desc_read(entry_priv->desc, 2, &word);
-	rt2x00_set_field32(&word, RXD_W2_BUFFER_LENGTH, entry->skb->len);
-	rt2x00_desc_write(entry_priv->desc, 2, word);
+	if (entry->queue->qid == QID_RX) {
+		rt2x00_desc_read(entry_priv->desc, 0, &word);
 
-	rt2x00_desc_read(entry_priv->desc, 1, &word);
-	rt2x00_set_field32(&word, RXD_W1_BUFFER_ADDRESS, skbdesc->skb_dma);
-	rt2x00_desc_write(entry_priv->desc, 1, word);
+		return rt2x00_get_field32(word, RXD_W0_OWNER_NIC);
+	} else {
+		rt2x00_desc_read(entry_priv->desc, 0, &word);
 
-	rt2x00_desc_read(entry_priv->desc, 0, &word);
-	rt2x00_set_field32(&word, RXD_W0_OWNER_NIC, 1);
-	rt2x00_desc_write(entry_priv->desc, 0, word);
+		return (rt2x00_get_field32(word, TXD_W0_OWNER_NIC) ||
+		        rt2x00_get_field32(word, TXD_W0_VALID));
+	}
 }
 
-static void rt2400pci_init_txentry(struct rt2x00_dev *rt2x00dev,
-				   struct queue_entry *entry)
+static void rt2400pci_clear_entry(struct queue_entry *entry)
 {
 	struct queue_entry_priv_pci *entry_priv = entry->priv_data;
+	struct skb_frame_desc *skbdesc = get_skb_frame_desc(entry->skb);
 	u32 word;
 
-	rt2x00_desc_read(entry_priv->desc, 0, &word);
-	rt2x00_set_field32(&word, TXD_W0_VALID, 0);
-	rt2x00_set_field32(&word, TXD_W0_OWNER_NIC, 0);
-	rt2x00_desc_write(entry_priv->desc, 0, word);
+	if (entry->queue->qid == QID_RX) {
+		rt2x00_desc_read(entry_priv->desc, 2, &word);
+		rt2x00_set_field32(&word, RXD_W2_BUFFER_LENGTH, entry->skb->len);
+		rt2x00_desc_write(entry_priv->desc, 2, word);
+
+		rt2x00_desc_read(entry_priv->desc, 1, &word);
+		rt2x00_set_field32(&word, RXD_W1_BUFFER_ADDRESS, skbdesc->skb_dma);
+		rt2x00_desc_write(entry_priv->desc, 1, word);
+
+		rt2x00_desc_read(entry_priv->desc, 0, &word);
+		rt2x00_set_field32(&word, RXD_W0_OWNER_NIC, 1);
+		rt2x00_desc_write(entry_priv->desc, 0, word);
+	} else {
+		rt2x00_desc_read(entry_priv->desc, 0, &word);
+		rt2x00_set_field32(&word, TXD_W0_VALID, 0);
+		rt2x00_set_field32(&word, TXD_W0_OWNER_NIC, 0);
+		rt2x00_desc_write(entry_priv->desc, 0, word);
+	}
 }
 
 static int rt2400pci_init_queues(struct rt2x00_dev *rt2x00dev)
@@ -1570,8 +1581,8 @@ static const struct rt2x00lib_ops rt2400pci_rt2x00_ops = {
 	.probe_hw		= rt2400pci_probe_hw,
 	.initialize		= rt2x00pci_initialize,
 	.uninitialize		= rt2x00pci_uninitialize,
-	.init_rxentry		= rt2400pci_init_rxentry,
-	.init_txentry		= rt2400pci_init_txentry,
+	.get_entry_state	= rt2400pci_get_entry_state,
+	.clear_entry		= rt2400pci_clear_entry,
 	.set_device_state	= rt2400pci_set_device_state,
 	.rfkill_poll		= rt2400pci_rfkill_poll,
 	.link_stats		= rt2400pci_link_stats,

drivers/net/wireless/rt2x00/rt2500pci.c

@@ -722,32 +722,43 @@ static void rt2500pci_link_tuner(struct rt2x00_dev *rt2x00dev)
 /*
  * Initialization functions.
  */
-static void rt2500pci_init_rxentry(struct rt2x00_dev *rt2x00dev,
-				   struct queue_entry *entry)
+static bool rt2500pci_get_entry_state(struct queue_entry *entry)
 {
 	struct queue_entry_priv_pci *entry_priv = entry->priv_data;
-	struct skb_frame_desc *skbdesc = get_skb_frame_desc(entry->skb);
 	u32 word;
 
-	rt2x00_desc_read(entry_priv->desc, 1, &word);
-	rt2x00_set_field32(&word, RXD_W1_BUFFER_ADDRESS, skbdesc->skb_dma);
-	rt2x00_desc_write(entry_priv->desc, 1, word);
+	if (entry->queue->qid == QID_RX) {
+		rt2x00_desc_read(entry_priv->desc, 0, &word);
+
+		return rt2x00_get_field32(word, RXD_W0_OWNER_NIC);
+	} else {
+		rt2x00_desc_read(entry_priv->desc, 0, &word);
 
-	rt2x00_desc_read(entry_priv->desc, 0, &word);
-	rt2x00_set_field32(&word, RXD_W0_OWNER_NIC, 1);
-	rt2x00_desc_write(entry_priv->desc, 0, word);
+		return (rt2x00_get_field32(word, TXD_W0_OWNER_NIC) ||
+		        rt2x00_get_field32(word, TXD_W0_VALID));
+	}
 }
 
-static void rt2500pci_init_txentry(struct rt2x00_dev *rt2x00dev,
-				   struct queue_entry *entry)
+static void rt2500pci_clear_entry(struct queue_entry *entry)
 {
 	struct queue_entry_priv_pci *entry_priv = entry->priv_data;
+	struct skb_frame_desc *skbdesc = get_skb_frame_desc(entry->skb);
 	u32 word;
 
-	rt2x00_desc_read(entry_priv->desc, 0, &word);
-	rt2x00_set_field32(&word, TXD_W0_VALID, 0);
-	rt2x00_set_field32(&word, TXD_W0_OWNER_NIC, 0);
-	rt2x00_desc_write(entry_priv->desc, 0, word);
+	if (entry->queue->qid == QID_RX) {
+		rt2x00_desc_read(entry_priv->desc, 1, &word);
+		rt2x00_set_field32(&word, RXD_W1_BUFFER_ADDRESS, skbdesc->skb_dma);
+		rt2x00_desc_write(entry_priv->desc, 1, word);
+
+		rt2x00_desc_read(entry_priv->desc, 0, &word);
+		rt2x00_set_field32(&word, RXD_W0_OWNER_NIC, 1);
+		rt2x00_desc_write(entry_priv->desc, 0, word);
+	} else {
+		rt2x00_desc_read(entry_priv->desc, 0, &word);
+		rt2x00_set_field32(&word, TXD_W0_VALID, 0);
+		rt2x00_set_field32(&word, TXD_W0_OWNER_NIC, 0);
+		rt2x00_desc_write(entry_priv->desc, 0, word);
+	}
 }
 
 static int rt2500pci_init_queues(struct rt2x00_dev *rt2x00dev)
@@ -1871,8 +1882,8 @@ static const struct rt2x00lib_ops rt2500pci_rt2x00_ops = {
 	.probe_hw		= rt2500pci_probe_hw,
 	.initialize		= rt2x00pci_initialize,
 	.uninitialize		= rt2x00pci_uninitialize,
-	.init_rxentry		= rt2500pci_init_rxentry,
-	.init_txentry		= rt2500pci_init_txentry,
+	.get_entry_state	= rt2500pci_get_entry_state,
+	.clear_entry		= rt2500pci_clear_entry,
 	.set_device_state	= rt2500pci_set_device_state,
 	.rfkill_poll		= rt2500pci_rfkill_poll,
 	.link_stats		= rt2500pci_link_stats,

drivers/net/wireless/rt2x00/rt2500usb.c

@@ -1777,8 +1777,7 @@ static const struct rt2x00lib_ops rt2500usb_rt2x00_ops = {
 	.probe_hw		= rt2500usb_probe_hw,
 	.initialize		= rt2x00usb_initialize,
 	.uninitialize		= rt2x00usb_uninitialize,
-	.init_rxentry		= rt2x00usb_init_rxentry,
-	.init_txentry		= rt2x00usb_init_txentry,
+	.clear_entry		= rt2x00usb_clear_entry,
 	.set_device_state	= rt2500usb_set_device_state,
 	.link_stats		= rt2500usb_link_stats,
 	.reset_tuner		= rt2500usb_reset_tuner,

drivers/net/wireless/rt2x00/rt2x00.h

@@ -523,10 +523,8 @@ struct rt2x00lib_ops {
 	/*
 	 * queue initialization handlers
 	 */
-	void (*init_rxentry) (struct rt2x00_dev *rt2x00dev,
-			      struct queue_entry *entry);
-	void (*init_txentry) (struct rt2x00_dev *rt2x00dev,
-			      struct queue_entry *entry);
+	bool (*get_entry_state) (struct queue_entry *entry);
+	void (*clear_entry) (struct queue_entry *entry);
 
 	/*
 	 * Radio control handlers.

drivers/net/wireless/rt2x00/rt2x00dev.c

@@ -101,8 +101,7 @@ int rt2x00lib_enable_radio(struct rt2x00_dev *rt2x00dev)
 	/*
 	 * Initialize all data queues.
 	 */
-	rt2x00queue_init_rx(rt2x00dev);
-	rt2x00queue_init_tx(rt2x00dev);
+	rt2x00queue_init_queues(rt2x00dev);
 
 	/*
 	 * Enable radio.
@@ -576,7 +575,7 @@ void rt2x00lib_txdone(struct queue_entry *entry,
 	entry->skb = NULL;
 	entry->flags = 0;
 
-	rt2x00dev->ops->lib->init_txentry(rt2x00dev, entry);
+	rt2x00dev->ops->lib->clear_entry(entry);
 
 	clear_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags);
 	rt2x00queue_index_inc(entry->queue, Q_INDEX_DONE);
@@ -708,7 +707,7 @@ void rt2x00lib_rxdone(struct rt2x00_dev *rt2x00dev,
 	entry->skb = skb;
 	entry->flags = 0;
 
-	rt2x00dev->ops->lib->init_rxentry(rt2x00dev, entry);
+	rt2x00dev->ops->lib->clear_entry(entry);
 
 	rt2x00queue_index_inc(entry->queue, Q_INDEX);
 }

drivers/net/wireless/rt2x00/rt2x00lib.h

@@ -150,8 +150,16 @@ int rt2x00queue_update_beacon(struct rt2x00_dev *rt2x00dev,
  */
 void rt2x00queue_index_inc(struct data_queue *queue, enum queue_index index);
 
-void rt2x00queue_init_rx(struct rt2x00_dev *rt2x00dev);
-void rt2x00queue_init_tx(struct rt2x00_dev *rt2x00dev);
+/**
+ * rt2x00queue_init_queues - Initialize all data queues
+ * @rt2x00dev: Pointer to &struct rt2x00_dev.
+ *
+ * This function will loop through all available queues to clear all
+ * index numbers and set the queue entry to the correct initialization
+ * state.
+ */
+void rt2x00queue_init_queues(struct rt2x00_dev *rt2x00dev);
+
 int rt2x00queue_initialize(struct rt2x00_dev *rt2x00dev);
 void rt2x00queue_uninitialize(struct rt2x00_dev *rt2x00dev);
 int rt2x00queue_allocate(struct rt2x00_dev *rt2x00dev);

drivers/net/wireless/rt2x00/rt2x00pci.c

@@ -36,20 +36,17 @@
  */
 int rt2x00pci_write_tx_data(struct queue_entry *entry)
 {
+	struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev;
 	struct queue_entry_priv_pci *entry_priv = entry->priv_data;
 	struct skb_frame_desc *skbdesc;
-	u32 word;
-
-	rt2x00_desc_read(entry_priv->desc, 0, &word);
 
 	/*
 	 * This should not happen, we already checked the entry
 	 * was ours. When the hardware disagrees there has been
 	 * a queue corruption!
 	 */
-	if (unlikely(rt2x00_get_field32(word, TXD_ENTRY_OWNER_NIC) ||
-		     rt2x00_get_field32(word, TXD_ENTRY_VALID))) {
-		ERROR(entry->queue->rt2x00dev,
+	if (unlikely(rt2x00dev->ops->lib->get_entry_state(entry))) {
+		ERROR(rt2x00dev,
 		      "Corrupt queue %d, accessing entry which is not ours.\n"
 		      "Please file bug report to %s.\n",
 		      entry->queue->qid, DRV_PROJECT);
@@ -76,14 +73,12 @@ void rt2x00pci_rxdone(struct rt2x00_dev *rt2x00dev)
 	struct queue_entry *entry;
 	struct queue_entry_priv_pci *entry_priv;
 	struct skb_frame_desc *skbdesc;
-	u32 word;
 
 	while (1) {
 		entry = rt2x00queue_get_entry(queue, Q_INDEX);
 		entry_priv = entry->priv_data;
-		rt2x00_desc_read(entry_priv->desc, 0, &word);
 
-		if (rt2x00_get_field32(word, RXD_ENTRY_OWNER_NIC))
+		if (rt2x00dev->ops->lib->get_entry_state(entry))
 			break;
 
 		/*

drivers/net/wireless/rt2x00/rt2x00pci.h

@@ -43,17 +43,6 @@
 #define REGISTER_BUSY_COUNT	5
 #define REGISTER_BUSY_DELAY	100
 
-/*
- * Descriptor availability flags.
- * All PCI device descriptors have these 2 flags
- * with the exact same definition.
- * By storing them here we can use them inside rt2x00pci
- * for some simple entry availability checking.
- */
-#define TXD_ENTRY_OWNER_NIC	FIELD32(0x00000001)
-#define TXD_ENTRY_VALID		FIELD32(0x00000002)
-#define RXD_ENTRY_OWNER_NIC	FIELD32(0x00000001)
-
 /*
  * Register access.
  */

drivers/net/wireless/rt2x00/rt2x00queue.c

@@ -589,40 +589,18 @@ static void rt2x00queue_reset(struct data_queue *queue)
 	spin_unlock_irqrestore(&queue->lock, irqflags);
 }
 
-void rt2x00queue_init_rx(struct rt2x00_dev *rt2x00dev)
-{
-	struct data_queue *queue = rt2x00dev->rx;
-	unsigned int i;
-
-	rt2x00queue_reset(queue);
-
-	if (!rt2x00dev->ops->lib->init_rxentry)
-		return;
-
-	for (i = 0; i < queue->limit; i++) {
-		queue->entries[i].flags = 0;
-
-		rt2x00dev->ops->lib->init_rxentry(rt2x00dev,
-						  &queue->entries[i]);
-	}
-}
-
-void rt2x00queue_init_tx(struct rt2x00_dev *rt2x00dev)
+void rt2x00queue_init_queues(struct rt2x00_dev *rt2x00dev)
 {
 	struct data_queue *queue;
 	unsigned int i;
 
-	txall_queue_for_each(rt2x00dev, queue) {
+	queue_for_each(rt2x00dev, queue) {
 		rt2x00queue_reset(queue);
 
-		if (!rt2x00dev->ops->lib->init_txentry)
-			continue;
-
 		for (i = 0; i < queue->limit; i++) {
 			queue->entries[i].flags = 0;
 
-			rt2x00dev->ops->lib->init_txentry(rt2x00dev,
-							  &queue->entries[i]);
+			rt2x00dev->ops->lib->clear_entry(&queue->entries[i]);
 		}
 	}
 }

drivers/net/wireless/rt2x00/rt2x00usb.c

@@ -351,28 +351,25 @@ EXPORT_SYMBOL_GPL(rt2x00usb_disable_radio);
 /*
  * Device initialization handlers.
  */
-void rt2x00usb_init_rxentry(struct rt2x00_dev *rt2x00dev,
-			    struct queue_entry *entry)
+void rt2x00usb_clear_entry(struct queue_entry *entry)
 {
-	struct usb_device *usb_dev = to_usb_device_intf(rt2x00dev->dev);
+	struct usb_device *usb_dev =
+	    to_usb_device_intf(entry->queue->rt2x00dev->dev);
 	struct queue_entry_priv_usb *entry_priv = entry->priv_data;
 
-	usb_fill_bulk_urb(entry_priv->urb, usb_dev,
-			  usb_rcvbulkpipe(usb_dev, 1),
-			  entry->skb->data, entry->skb->len,
-			  rt2x00usb_interrupt_rxdone, entry);
+	if (entry->queue->qid == QID_RX) {
+		usb_fill_bulk_urb(entry_priv->urb, usb_dev,
+				usb_rcvbulkpipe(usb_dev, 1),
+				entry->skb->data, entry->skb->len,
+				rt2x00usb_interrupt_rxdone, entry);
 
-	set_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags);
-	usb_submit_urb(entry_priv->urb, GFP_ATOMIC);
-}
-EXPORT_SYMBOL_GPL(rt2x00usb_init_rxentry);
-
-void rt2x00usb_init_txentry(struct rt2x00_dev *rt2x00dev,
-			    struct queue_entry *entry)
-{
-	entry->flags = 0;
+		set_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags);
+		usb_submit_urb(entry_priv->urb, GFP_ATOMIC);
+	} else {
+		entry->flags = 0;
+	}
 }
-EXPORT_SYMBOL_GPL(rt2x00usb_init_txentry);
+EXPORT_SYMBOL_GPL(rt2x00usb_clear_entry);
 
 static int rt2x00usb_alloc_urb(struct rt2x00_dev *rt2x00dev,
 			       struct data_queue *queue)

drivers/net/wireless/rt2x00/rt2x00usb.h

@@ -286,10 +286,7 @@ void rt2x00usb_kick_tx_queue(struct rt2x00_dev *rt2x00dev,
 /*
  * Device initialization handlers.
  */
-void rt2x00usb_init_rxentry(struct rt2x00_dev *rt2x00dev,
-			    struct queue_entry *entry);
-void rt2x00usb_init_txentry(struct rt2x00_dev *rt2x00dev,
-			    struct queue_entry *entry);
+void rt2x00usb_clear_entry(struct queue_entry *entry);
 int rt2x00usb_initialize(struct rt2x00_dev *rt2x00dev);
 void rt2x00usb_uninitialize(struct rt2x00_dev *rt2x00dev);