diff options
| author | Olof Johansson <olof@lixom.net> | 2007-05-08 09:47:37 +0400 |
|---|---|---|
| committer | Jeff Garzik <jeff@garzik.org> | 2007-05-08 09:47:53 +0400 |
| commit | 9f05cfe250498791cd24707aea3b728b52d886d5 (patch) | |
| tree | ef44ef0636d23656dba9500b06b12ebed34bfaff /drivers/net | |
| parent | 6dfa7522d8b08c887bf9f4cb2600b89232f132f5 (diff) | |
| download | linux-9f05cfe250498791cd24707aea3b728b52d886d5.tar.xz | |
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')
| -rw-r--r-- | drivers/net/pasemi_mac.c | 31 |
1 files changed, 24 insertions, 7 deletions
diff --git a/drivers/net/pasemi_mac.c b/drivers/net/pasemi_mac.c index 2bf13cf55358..216bb4a2c633 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); |