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pasemi_mac: Add SKB reuse / copy-break

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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>
This commit is contained in:
Olof Johansson 2007-05-08 00:47:37 -05:00 committed by Jeff Garzik
parent 6dfa7522d8
commit 9f05cfe250
1 changed files with 24 additions and 7 deletions
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31
drivers/net/pasemi_mac.c
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@ -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);