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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>
This commit is contained in:
Ben Greear 2012-02-11 15:40:11 +00:00 committed by Jeff Kirsher
parent 11a78dcf35
commit b0d1562c82
1 changed files with 11 additions and 10 deletions
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21
drivers/net/ethernet/intel/e1000/e1000_main.c
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@ -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);