r8169 seems to have the same problem that the via-velocity did with skb padding.
Found by code-inspection only, no hardware to test.

Signed-off-by: Dave Jones <davej@redhat.com>

diff --git a/drivers/net/r8169.c b/drivers/net/r8169.c
index b347340..07b1de1 100644
--- a/drivers/net/r8169.c
+++ b/drivers/net/r8169.c
@@ -3145,7 +3145,9 @@ err_out:
 static void rtl8169_unmap_tx_skb(struct pci_dev *pdev, struct ring_info *tx_skb,
 				 struct TxDesc *desc)
 {
-	unsigned int len = tx_skb->len;
+	unsigned int len;
+
+	len = max_t(unsigned, tx_skb->len, ETH_ZLEN);
 
 	pci_unmap_single(pdev, le64_to_cpu(desc->addr), len, PCI_DMA_TODEVICE);
 	desc->opts1 = 0x00;
@@ -3364,11 +3366,9 @@ static int rtl8169_start_xmit(struct sk_buff *skb, struct net_device *dev)
 	} else {
 		len = skb->len;
 
-		if (unlikely(len < ETH_ZLEN)) {
-			if (skb_padto(skb, ETH_ZLEN))
-				goto err_update_stats;
-			len = ETH_ZLEN;
-		}
+		if (skb_padto(skb, ETH_ZLEN))
+			goto err_update_stats;
+		len = max_t(unsigned, skb->len, ETH_ZLEN);
 
 		opts1 |= FirstFrag | LastFrag;
 		tp->tx_skb[entry].skb = skb;
-- 
http://www.codemonkey.org.uk
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