e1000: Support RX-FCS flag.

This allows the NIC to pass the Ethernet Frame Checksum
(FCS) up the stack.  Useful when sniffing packets.

Signed-off-by: Ben Greear <greearb@candelatech.com>
Tested-by: Aaron Brown <aaron.f.brown@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>

diff --git a/drivers/net/ethernet/intel/e1000/e1000_main.c b/drivers/net/ethernet/intel/e1000/e1000_main.c
index bd1d28f..8aa8097 100644 (file)
--- a/drivers/net/ethernet/intel/e1000/e1000_main.c
+++ b/drivers/net/ethernet/intel/e1000/e1000_main.c
@@ -1071,6 +1071,7 @@ static int __devinit e1000_probe(struct pci_dev *pdev,
 
        netdev->features |= netdev->hw_features;
        netdev->hw_features |= NETIF_F_RXCSUM;
+       netdev->hw_features |= NETIF_F_RXFCS;
 
        if (pci_using_dac) {
                netdev->features |= NETIF_F_HIGHDMA;
@@ -4137,10 +4138,9 @@ static bool e1000_clean_jumbo_rx_irq(struct e1000_adapter *adapter,
                                  ((u32)(rx_desc->errors) << 24),
                                  le16_to_cpu(rx_desc->csum), skb);
 
-               pskb_trim(skb, skb->len - 4);
-
-               /* probably a little skewed due to removing CRC */
-               total_rx_bytes += skb->len;
+               total_rx_bytes += (skb->len - 4); /* don't count FCS */
+               if (likely(!(netdev->features & NETIF_F_RXFCS)))
+                       pskb_trim(skb, skb->len - 4);
                total_rx_packets++;
 
                /* eth type trans needs skb->data to point to something */
@@ -4294,14 +4294,15 @@ static bool e1000_clean_rx_irq(struct e1000_adapter *adapter,
                        }
                }
 
-               /* adjust length to remove Ethernet CRC, this must be
-                * done after the TBI_ACCEPT workaround above */
-               length -= 4;
-
-               /* probably a little skewed due to removing CRC */
-               total_rx_bytes += length;
+               total_rx_bytes += (length - 4); /* don't count FCS */
                total_rx_packets++;
 
+               if (likely(!(netdev->features & NETIF_F_RXFCS)))
+                       /* adjust length to remove Ethernet CRC, this must be
+                        * done after the TBI_ACCEPT workaround above
+                        */
+                       length -= 4;
+
                e1000_check_copybreak(netdev, buffer_info, length, &skb);
 
                skb_put(skb, length);