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-rw-r--r--Documentation/networking/netdev-features.txt13
1 files changed, 13 insertions, 0 deletions
diff --git a/Documentation/networking/netdev-features.txt b/Documentation/networking/netdev-features.txt
index 4b1c0dc..4164f5c 100644
--- a/Documentation/networking/netdev-features.txt
+++ b/Documentation/networking/netdev-features.txt
@@ -152,3 +152,16 @@ 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.
+
+* rx-all
+
+This requests that the NIC receive all possible frames, including errored
+frames (such as bad FCS, etc). This can be helpful when sniffing a link with
+bad packets on it. Some NICs may receive more packets if also put into normal
+PROMISC mdoe.