net: Add ethernet FCS length macro in net.h

Some ethernet drivers use their own version of ethernet FCS length
macro which is really common. We define ETH_FCS_LEN in net.h and
replace those custom versions in various places.

Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Acked-by: Joe Hershberger <joe.hershberger@ni.com>

drivers/net/e1000.h

@@ -430,12 +430,11 @@ struct e1000_phy_stats {
 #define ENET_HEADER_SIZE	     14
 #define MAXIMUM_ETHERNET_FRAME_SIZE  1518	/* With FCS */
 #define MINIMUM_ETHERNET_FRAME_SIZE  64	/* With FCS */
-#define ETHERNET_FCS_SIZE	     4
 #define MAXIMUM_ETHERNET_PACKET_SIZE \
-    (MAXIMUM_ETHERNET_FRAME_SIZE - ETHERNET_FCS_SIZE)
+	(MAXIMUM_ETHERNET_FRAME_SIZE - ETH_FCS_LEN)
 #define MINIMUM_ETHERNET_PACKET_SIZE \
-    (MINIMUM_ETHERNET_FRAME_SIZE - ETHERNET_FCS_SIZE)
-#define CRC_LENGTH		     ETHERNET_FCS_SIZE
+	(MINIMUM_ETHERNET_FRAME_SIZE - ETH_FCS_LEN)
+#define CRC_LENGTH		     ETH_FCS_LEN
 #define MAX_JUMBO_FRAME_SIZE	     0x3F00
 
 /* 802.1q VLAN Packet Sizes */

drivers/usb/gadget/ether.c

@@ -68,7 +68,6 @@ unsigned packet_received, packet_sent;
 #define ETH_ZLEN	60		/* Min. octets in frame sans FCS */
 #define ETH_DATA_LEN	1500		/* Max. octets in payload	 */
 #define ETH_FRAME_LEN	PKTSIZE_ALIGN	/* Max. octets in frame sans FCS */
-#define ETH_FCS_LEN	4		/* Octets in the FCS		 */
 
 #define DRIVER_DESC		"Ethernet Gadget"
 /* Based on linux 2.6.27 version */

drivers/usb/gadget/rndis.c

@@ -43,7 +43,6 @@
 #define ETH_ZLEN	60		/* Min. octets in frame sans FCS */
 #define ETH_DATA_LEN	1500		/* Max. octets in payload	 */
 #define ETH_FRAME_LEN	PKTSIZE_ALIGN	/* Max. octets in frame sans FCS */
-#define ETH_FCS_LEN	4		/* Octets in the FCS		 */
 #define ENOTSUPP        524     /* Operation is not supported */
 
 

include/net.h

@@ -191,6 +191,8 @@ struct ethernet_hdr {
 /* Ethernet header size */
 #define ETHER_HDR_SIZE	(sizeof(struct ethernet_hdr))
 
+#define ETH_FCS_LEN	4		/* Octets in the FCS		*/
+
 struct e802_hdr {
 	uchar		et_dest[6];	/* Destination node		*/
 	uchar		et_src[6];	/* Source node			*/

include/usb_ether.h

@@ -18,7 +18,6 @@
 #define ETH_ZLEN	60		/* Min. octets in frame sans FCS */
 #define ETH_DATA_LEN	1500		/* Max. octets in payload	 */
 #define ETH_FRAME_LEN	PKTSIZE_ALIGN	/* Max. octets in frame sans FCS */
-#define ETH_FCS_LEN	4		/* Octets in the FCS		 */
 
 struct ueth_data {
 	/* eth info */