3 files changed, 9 insertions, 0 deletions

diff --git a/Documentation/networking/netdev-features.txt b/Documentation/networking/netdev-features.txt
index 4b1c0dcef84c..7d2781230d30 100644
--- a/Documentation/networking/netdev-features.txt
+++ b/Documentation/networking/netdev-features.txt
@@ -152,3 +152,9 @@ NETIF_F_VLAN_CHALLENGED should be set for devices which can't cope with VLAN
 headers. Some drivers set this because the cards can't handle the bigger MTU.
 [FIXME: Those cases could be fixed in VLAN code by allowing only reduced-MTU
 VLANs. This may be not useful, though.]
+
+*  rx-fcs
+
+This requests that the NIC append the Ethernet Frame Checksum (FCS)
+to the end of the skb data.  This allows sniffers and other tools to
+read the CRC recorded by the NIC on receipt of the packet.
diff --git a/include/linux/netdev_features.h b/include/linux/netdev_features.h
index 77f5202977ce..d1331865f830 100644
--- a/include/linux/netdev_features.h
+++ b/include/linux/netdev_features.h
@@ -54,6 +54,7 @@ enum {
         NETIF_F_RXCSUM_BIT,             /* Receive checksumming offload */
         NETIF_F_NOCACHE_COPY_BIT,       /* Use no-cache copyfromuser */
         NETIF_F_LOOPBACK_BIT,           /* Enable loopback */
+        NETIF_F_RXFCS_BIT,              /* Append FCS to skb pkt data */
 
         /*
          * Add your fresh new feature above and remember to update
@@ -98,6 +99,7 @@ enum {
 #define NETIF_F_TSO             __NETIF_F(TSO)
 #define NETIF_F_UFO             __NETIF_F(UFO)
 #define NETIF_F_VLAN_CHALLENGED __NETIF_F(VLAN_CHALLENGED)
+#define NETIF_F_RXFCS           __NETIF_F(RXFCS)
 
 /* Features valid for ethtool to change */
 /* = all defined minus driver/device-class-related */
diff --git a/net/core/ethtool.c b/net/core/ethtool.c
index 3f79db1b612a..080161924a0d 100644
--- a/net/core/ethtool.c
+++ b/net/core/ethtool.c
@@ -73,6 +73,7 @@ static const char netdev_features_strings[NETDEV_FEATURE_COUNT][ETH_GSTRING_LEN]
         [NETIF_F_RXCSUM_BIT] =           "rx-checksum",
         [NETIF_F_NOCACHE_COPY_BIT] =     "tx-nocache-copy",
         [NETIF_F_LOOPBACK_BIT] =         "loopback",
+        [NETIF_F_RXFCS_BIT] =            "rx-fcs",
 };
 
 static int ethtool_get_features(struct net_device *dev, void __user *useraddr)