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>
diff --git a/drivers/net/r8169.c b/drivers/net/r8169.c
index d8862cd..1942bf7 100644
--- a/drivers/net/r8169.c
+++ b/drivers/net/r8169.c
@@ -1415,7 +1415,7 @@
[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 @@
{
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);