Add constant for FCS/CRC length (frame check sequence)

About a dozen drivers that have some form of crc checksumming or offloading
use this constant, warranting a global define for it.

Signed-off-by: Auke Kok <auke-jan.h.kok@intel.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>

diff --git a/include/linux/if_ether.h b/include/linux/if_ether.h
index 1db774c..3213f6f 100644 (file)
--- a/include/linux/if_ether.h
+++ b/include/linux/if_ether.h
@@ -33,6 +33,7 @@
 #define ETH_ZLEN       60              /* Min. octets in frame sans FCS */
 #define ETH_DATA_LEN   1500            /* Max. octets in payload        */
 #define ETH_FRAME_LEN  1514            /* Max. octets in frame sans FCS */
+#define ETH_FCS_LEN    4               /* Octets in the FCS             */
 
 /*
  *     These are the defined Ethernet Protocol ID's.