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authorIvo van Doorn <ivdoorn@gmail.com>2008-05-05 17:23:31 +0200
committerJohn W. Linville <linville@tuxdriver.com>2008-05-12 21:22:17 -0400
commit78720897459a0ed3843c80e9bd9ef1b2f7ae5c8f (patch)
tree7ae55076399b4f58ff12e4bb8ca32a4e1738b83d /drivers/net/wireless/rt2x00/rt61pci.c
parent6243065d308ab566aa318a8adef853bc0418896d (diff)
rt2x00: Don't use pskb_expand_head()
rt2x00pci allocates DMA for descriptor and data, rt61pci doesn't use this for the beacon, but it can use the descriptor part as temporary buffer instead of using pskb_expand_head(). Using this temporary buffer is obviously much better then reallocating the skb buffer... At the same time we can set the data length for the beacon queue at 0, to make sure no DMA is allocated for data (but just for the descriptor). Signed-off-by: Ivo van Doorn <IvDoorn@gmail.com> Signed-off-by: John W. Linville <linville@tuxdriver.com>
Diffstat (limited to 'drivers/net/wireless/rt2x00/rt61pci.c')
-rw-r--r--drivers/net/wireless/rt2x00/rt61pci.c31
1 files changed, 11 insertions, 20 deletions
diff --git a/drivers/net/wireless/rt2x00/rt61pci.c b/drivers/net/wireless/rt2x00/rt61pci.c
index ae12dcdd3c2..14bc7b28165 100644
--- a/drivers/net/wireless/rt2x00/rt61pci.c
+++ b/drivers/net/wireless/rt2x00/rt61pci.c
@@ -2366,6 +2366,7 @@ static int rt61pci_beacon_update(struct ieee80211_hw *hw, struct sk_buff *skb,
{
struct rt2x00_dev *rt2x00dev = hw->priv;
struct rt2x00_intf *intf = vif_to_intf(control->vif);
+ struct queue_entry_priv_pci_tx *priv_tx;
struct skb_frame_desc *skbdesc;
unsigned int beacon_base;
u32 reg;
@@ -2373,21 +2374,8 @@ static int rt61pci_beacon_update(struct ieee80211_hw *hw, struct sk_buff *skb,
if (unlikely(!intf->beacon))
return -ENOBUFS;
- /*
- * We need to append the descriptor in front of the
- * beacon frame.
- */
- if (skb_headroom(skb) < intf->beacon->queue->desc_size) {
- if (pskb_expand_head(skb, intf->beacon->queue->desc_size,
- 0, GFP_ATOMIC))
- return -ENOMEM;
- }
-
- /*
- * Add the descriptor in front of the skb.
- */
- skb_push(skb, intf->beacon->queue->desc_size);
- memset(skb->data, 0, intf->beacon->queue->desc_size);
+ priv_tx = intf->beacon->priv_data;
+ memset(priv_tx->desc, 0, intf->beacon->queue->desc_size);
/*
* Fill in skb descriptor
@@ -2395,9 +2383,9 @@ static int rt61pci_beacon_update(struct ieee80211_hw *hw, struct sk_buff *skb,
skbdesc = get_skb_frame_desc(skb);
memset(skbdesc, 0, sizeof(*skbdesc));
skbdesc->flags |= FRAME_DESC_DRIVER_GENERATED;
- skbdesc->data = skb->data + intf->beacon->queue->desc_size;
- skbdesc->data_len = skb->len - intf->beacon->queue->desc_size;
- skbdesc->desc = skb->data;
+ skbdesc->data = skb->data;
+ skbdesc->data_len = skb->len;
+ skbdesc->desc = priv_tx->desc;
skbdesc->desc_len = intf->beacon->queue->desc_size;
skbdesc->entry = intf->beacon;
@@ -2425,7 +2413,10 @@ static int rt61pci_beacon_update(struct ieee80211_hw *hw, struct sk_buff *skb,
*/
beacon_base = HW_BEACON_OFFSET(intf->beacon->entry_idx);
rt2x00pci_register_multiwrite(rt2x00dev, beacon_base,
- skb->data, skb->len);
+ skbdesc->desc, skbdesc->desc_len);
+ rt2x00pci_register_multiwrite(rt2x00dev,
+ beacon_base + skbdesc->desc_len,
+ skbdesc->data, skbdesc->data_len);
rt61pci_kick_tx_queue(rt2x00dev, control->queue);
return 0;
@@ -2490,7 +2481,7 @@ static const struct data_queue_desc rt61pci_queue_tx = {
static const struct data_queue_desc rt61pci_queue_bcn = {
.entry_num = 4 * BEACON_ENTRIES,
- .data_size = MGMT_FRAME_SIZE,
+ .data_size = 0, /* No DMA required for beacons */
.desc_size = TXINFO_SIZE,
.priv_size = sizeof(struct queue_entry_priv_pci_tx),
};