8139too: Support RX-FCS flag.

This allows the NIC to pass the Ethernet FCS on up
the stack, and is useful when sniffing networks.

Signed-off-by: Ben Greear <greearb@candelatech.com>

1 files changed, 5 insertions, 1 deletions

diff --git a/drivers/net/ethernet/realtek/8139too.c b/drivers/net/ethernet/realtek/8139too.c
index 1b9a090d4865..abd6aca70e9b 100644
--- a/drivers/net/ethernet/realtek/8139too.c
+++ b/drivers/net/ethernet/realtek/8139too.c
@@ -1023,6 +1023,7 @@ static int __devinit rtl8139_init_one (struct pci_dev *pdev,
         dev->vlan_features = dev->features;
 
         dev->hw_features |= NETIF_F_RXALL;
+        dev->hw_features |= NETIF_F_RXFCS;
 
         dev->irq = pdev->irq;
 
@@ -1970,7 +1971,10 @@ static int rtl8139_rx(struct net_device *dev, struct rtl8139_private *tp,
                 /* read size+status of next frame from DMA ring buffer */
                 rx_status = le32_to_cpu (*(__le32 *) (rx_ring + ring_offset));
                 rx_size = rx_status >> 16;
-                pkt_size = rx_size - 4;
+                if (likely(!(dev->features & NETIF_F_RXFCS)))
+                        pkt_size = rx_size - 4;
+                else
+                        pkt_size = rx_size;
 
                 netif_dbg(tp, rx_status, dev, "%s() status %04x, size %04x, cur %04x\n",
                           __func__, rx_status, rx_size, cur_rx);