rt2x00: Replace statically allocated DMA buffers with mapped skb's.

The current PCI drivers require a lot of pre-allocated DMA buffers. Reduce this
by using dynamically mapped skb's (using pci_map_single) instead of the pre-
allocated DMA buffers that are allocated at device start-up time.

At the same time move common RX path code into rt2x00lib from rt2x00pci and
rt2x00usb, as the RX paths now are now almost the same.

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

1 files changed, 6 insertions, 4 deletions

diff --git a/drivers/net/wireless/rt2x00/rt2500pci.c b/drivers/net/wireless/rt2x00/rt2500pci.c
index 5f0117f9a88b..5077b62dcc5a 100644
--- a/drivers/net/wireless/rt2x00/rt2500pci.c
+++ b/drivers/net/wireless/rt2x00/rt2500pci.c
@@ -727,10 +727,11 @@ static void rt2500pci_init_rxentry(struct rt2x00_dev *rt2x00dev,
                                    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, entry_priv->data_dma);
+        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);
@@ -1171,7 +1172,7 @@ static void rt2500pci_write_tx_desc(struct rt2x00_dev *rt2x00dev,
          * Start writing the descriptor words.
          */
         rt2x00_desc_read(entry_priv->desc, 1, &word);
-        rt2x00_set_field32(&word, TXD_W1_BUFFER_ADDRESS, entry_priv->data_dma);
+        rt2x00_set_field32(&word, TXD_W1_BUFFER_ADDRESS, skbdesc->skb_dma);
         rt2x00_desc_write(entry_priv->desc, 1, word);
 
         rt2x00_desc_read(txd, 2, &word);
@@ -1752,9 +1753,10 @@ static int rt2500pci_probe_hw(struct rt2x00_dev *rt2x00dev)
         rt2500pci_probe_hw_mode(rt2x00dev);
 
         /*
-         * This device requires the atim queue
+         * This device requires the atim queue and DMA-mapped skbs.
          */
         __set_bit(DRIVER_REQUIRE_ATIM_QUEUE, &rt2x00dev->flags);
+        __set_bit(DRIVER_REQUIRE_DMA, &rt2x00dev->flags);
 
         /*
          * Set the rssi offset.
@@ -1842,7 +1844,7 @@ static int rt2500pci_beacon_update(struct ieee80211_hw *hw, struct sk_buff *skb)
          * Write entire beacon with descriptor to register,
          * and kick the beacon generator.
          */
-        memcpy(entry_priv->data, skb->data, skb->len);
+        rt2x00queue_map_txskb(rt2x00dev, intf->beacon->skb);
         rt2x00queue_write_tx_descriptor(intf->beacon, &txdesc);
         rt2x00dev->ops->lib->kick_tx_queue(rt2x00dev, QID_BEACON);