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authorOlof Johansson <olof@lixom.net>2007-05-08 00:47:37 -0500
committerJeff Garzik <jeff@garzik.org>2007-05-08 01:47:53 -0400
commit9f05cfe250498791cd24707aea3b728b52d886d5 (patch)
treeef44ef0636d23656dba9500b06b12ebed34bfaff /drivers/net/pasemi_mac.c
parent6dfa7522d8b08c887bf9f4cb2600b89232f132f5 (diff)
pasemi_mac: Add SKB reuse / copy-break
Add a copy-break and recycle the SKB in the driver for small packets. Signed-off-by: Olof Johansson <olof@lixom.net> Signed-off-by: Jeff Garzik <jeff@garzik.org>
Diffstat (limited to 'drivers/net/pasemi_mac.c')
-rw-r--r--drivers/net/pasemi_mac.c31
1 files changed, 24 insertions, 7 deletions
diff --git a/drivers/net/pasemi_mac.c b/drivers/net/pasemi_mac.c
index 2bf13cf5535..216bb4a2c63 100644
--- a/drivers/net/pasemi_mac.c
+++ b/drivers/net/pasemi_mac.c
@@ -279,8 +279,8 @@ static void pasemi_mac_free_rx_resources(struct net_device *dev)
for (i = 0; i < RX_RING_SIZE; i++) {
info = &RX_DESC_INFO(mac, i);
dp = &RX_DESC(mac, i);
- if (info->dma) {
- if (info->skb) {
+ if (info->skb) {
+ if (info->dma) {
pci_unmap_single(mac->dma_pdev,
info->dma,
info->skb->len,
@@ -329,12 +329,14 @@ static void pasemi_mac_replenish_rx_ring(struct net_device *dev)
struct sk_buff *skb;
dma_addr_t dma;
- skb = dev_alloc_skb(BUF_SIZE);
+ /* skb might still be in there for recycle on short receives */
+ if (info->skb)
+ skb = info->skb;
+ else
+ skb = dev_alloc_skb(BUF_SIZE);
- if (!skb) {
- count = i - start;
+ if (unlikely(!skb))
break;
- }
dma = pci_map_single(mac->dma_pdev, skb->data, skb->len,
PCI_DMA_FROMDEVICE);
@@ -442,13 +444,28 @@ static int pasemi_mac_clean_rx(struct pasemi_mac *mac, int limit)
BUG_ON(!info);
BUG_ON(info->dma != dma);
+ skb = info->skb;
pci_unmap_single(mac->dma_pdev, info->dma, info->skb->len,
PCI_DMA_FROMDEVICE);
+ info->dma = 0;
- skb = info->skb;
len = (dp->macrx & XCT_MACRX_LLEN_M) >> XCT_MACRX_LLEN_S;
+ if (len < 256) {
+ struct sk_buff *new_skb =
+ netdev_alloc_skb(mac->netdev, len + NET_IP_ALIGN);
+ if (new_skb) {
+ skb_reserve(new_skb, NET_IP_ALIGN);
+ memcpy(new_skb->data - NET_IP_ALIGN,
+ skb->data - NET_IP_ALIGN,
+ len + NET_IP_ALIGN);
+ /* save the skb in buffer_info as good */
+ skb = new_skb;
+ }
+ /* else just continue with the old one */
+ } else
+ info->skb = NULL;
skb_put(skb, len);