Patchwork [net-next,08/16] e1000: Support RX-FCS flag.

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Submitter Jeff Kirsher
Date Feb. 24, 2012, 10:13 a.m.
Message ID <1330078389-8203-9-git-send-email-jeffrey.t.kirsher@intel.com>
Download mbox | patch
Permalink /patch/142787/
State Accepted
Delegated to: David Miller
Headers show

Comments

Jeff Kirsher - Feb. 24, 2012, 10:13 a.m.
From: Ben Greear <greearb@candelatech.com>

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>
---
 drivers/net/ethernet/intel/e1000/e1000_main.c |   21 +++++++++++----------
 1 files changed, 11 insertions(+), 10 deletions(-)

Patch

diff --git a/drivers/net/ethernet/intel/e1000/e1000_main.c b/drivers/net/ethernet/intel/e1000/e1000_main.c
index bd1d28f..8aa8097 100644
--- 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);