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r8169: align the IP header when there is no DMA constraint 

Align the IP header when the chipset can DMA at any location (plain 0x8169).
Otherwise (0x8136/0x8168) obey the constraint imposed by the hardware.

This patch complements the previous alignment rework done for copybreak.

Original idea from Philip Craig <philipc@snapgear.com>

Signed-off-by: Francois Romieu <romieu@fr.zoreil.com>
Cc: Philip Craig <philipc@snapgear.com>
Cc: Mike Isely <isely@pobox.com>
Cc: Edward Hsu <edward_hsu@realtek.com.tw>
hifive-unleashed-5.1
Francois Romieu 2007-02-28 23:16:57 +01:00 committed by Jeff Garzik
parent 275391a482
commit e9f63f3086
1 changed files with 6 additions and 3 deletions
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9
drivers/net/r8169.c
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@ -1415,7 +1415,7 @@ static const struct rtl_cfg_info {
[RTL_CFG_0] = {
.hw_start = rtl_hw_start_8169,
.region = 1,
.align = 2,
.align = 0,
.intr_event = SYSErr | LinkChg | RxOverflow |
RxFIFOOver | TxErr | TxOK | RxOK | RxErr,
.napi_event = RxFIFOOver | TxErr | TxOK | RxOK | RxOverflow
@ -2076,12 +2076,15 @@ static struct sk_buff *rtl8169_alloc_rx_skb(struct pci_dev *pdev,
{
struct sk_buff *skb;
dma_addr_t mapping;
unsigned int pad;
skb = netdev_alloc_skb(dev, rx_buf_sz + align);
pad = align ? align : NET_IP_ALIGN;
skb = netdev_alloc_skb(dev, rx_buf_sz + pad);
if (!skb)
goto err_out;
skb_reserve(skb, (align - 1) & (unsigned long)skb->data);
skb_reserve(skb, align ? ((pad - 1) & (unsigned long)skb->data) : pad);
mapping = pci_map_single(pdev, skb->data, rx_buf_sz,
PCI_DMA_FROMDEVICE);