r8169: fix 8168evl frame padding.

commit e5195c1f31f399289347e043d6abf3ffa80f0005 upstream.

Signed-off-by: Stefan Bader <stefan.bader@canonical.com>
Acked-by: Francois Romieu <romieu@fr.zoreil.com>
Cc: hayeswang <hayeswang@realtek.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/net/ethernet/realtek/r8169.c b/drivers/net/ethernet/realtek/r8169.c
index 978af217ef0b03d9638d3594cd61d2607fb2eed2..dd037dda7855293a7950966ed24e664614f16441 100644 (file)
--- a/drivers/net/ethernet/realtek/r8169.c
+++ b/drivers/net/ethernet/realtek/r8169.c
@@ -5168,6 +5168,14 @@ static netdev_tx_t rtl8169_start_xmit(struct sk_buff *skb,
                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;
 
@@ -5239,6 +5247,7 @@ 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;