[112/118] r8169: fix 8168evl frame padding.

[Ben Hutchings]

3.2.45-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Francois Romieu <romieu@xxxxxxxxxxxxx>

From: Stefan Bader <stefan.bader@xxxxxxxxxxxxx>

commit e5195c1f31f399289347e043d6abf3ffa80f0005 upstream.

Signed-off-by: Stefan Bader <stefan.bader@xxxxxxxxxxxxx>
Acked-by: Francois Romieu <romieu@xxxxxxxxxxxxx>
Cc: hayeswang <hayeswang@xxxxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Ben Hutchings <ben@xxxxxxxxxxxxxxx>
---
 drivers/net/ethernet/realtek/r8169.c | 9 +++++++++
 1 file changed, 9 insertions(+)

--- a/drivers/net/ethernet/realtek/r8169.c
+++ b/drivers/net/ethernet/realtek/r8169.c
@@ -5566,6 +5566,14 @@ static netdev_tx_t rtl8169_start_xmit(st
 		goto err_stop_0;
 	}
 
+	/* 8168evl does not automatically pad to minimum length. */
+	if (unlikely(tp->mac_version == RTL_GIGA_MAC_VER_34 &&
+		     skb->len < ETH_ZLEN)) {
+		if (skb_padto(skb, ETH_ZLEN))
+			goto err_update_stats;
+		skb_put(skb, ETH_ZLEN - skb->len);
+	}
+
 	if (unlikely(le32_to_cpu(txd->opts1) & DescOwn))
 		goto err_stop_0;
 
@@ -5633,6 +5641,7 @@ err_dma_1:
 	rtl8169_unmap_tx_skb(d, tp->tx_skb + entry, txd);
 err_dma_0:
 	dev_kfree_skb(skb);
+err_update_stats:
 	dev->stats.tx_dropped++;
 	return NETDEV_TX_OK;
 

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