net: cosmetic: Rename OPT_SIZE to OPT_FIELD_SIZE

Clearer constant name.
Also remove related BOOTP_SIZE which was unused and doesn't take
into account VLAN packets.

Signed-off-by: Joe Hershberger <joe.hershberger@ni.com>

net/bootp.c

@@ -71,7 +71,7 @@ static int BootpCheckPkt(uchar *pkt, unsigned dest, unsigned src, unsigned len)
 
 	if (dest != PORT_BOOTPC || src != PORT_BOOTPS)
 		retval = -1;
-	else if (len < sizeof(struct Bootp_t) - OPT_SIZE)
+	else if (len < sizeof(struct Bootp_t) - OPT_FIELD_SIZE)
 		retval = -2;
 	else if (bp->bp_op != OP_BOOTREQUEST &&
 			bp->bp_op != OP_BOOTREPLY &&
@@ -368,8 +368,8 @@ static int DhcpExtended(u8 *e, int message_type, IPaddr_t ServerID,
 
 	*e++ = 57;		/* Maximum DHCP Message Size */
 	*e++ = 2;
-	*e++ = (576 - 312 + OPT_SIZE) >> 8;
-	*e++ = (576 - 312 + OPT_SIZE) & 0xff;
+	*e++ = (576 - 312 + OPT_FIELD_SIZE) >> 8;
+	*e++ = (576 - 312 + OPT_FIELD_SIZE) & 0xff;
 
 	if (ServerID) {
 		int tmp = ntohl(ServerID);
@@ -519,8 +519,8 @@ static int BootpExtended(u8 *e)
 
 	*e++ = 57;		/* Maximum DHCP Message Size */
 	*e++ = 2;
-	*e++ = (576 - 312 + OPT_SIZE) >> 16;
-	*e++ = (576 - 312 + OPT_SIZE) & 0xff;
+	*e++ = (576 - 312 + OPT_FIELD_SIZE) >> 16;
+	*e++ = (576 - 312 + OPT_FIELD_SIZE) & 0xff;
 #endif
 
 #if defined(CONFIG_BOOTP_SUBNETMASK)

net/bootp.h

@@ -20,13 +20,13 @@
  */
 #if defined(CONFIG_CMD_DHCP)
 /* Minimum DHCP Options size per RFC2131 - results in 576 byte pkt */
-#define OPT_SIZE 312
+#define OPT_FIELD_SIZE 312
 #if defined(CONFIG_BOOTP_VENDOREX)
 extern u8 *dhcp_vendorex_prep(u8 *e); /*rtn new e after add own opts. */
 extern u8 *dhcp_vendorex_proc(u8 *e); /*rtn next e if mine,else NULL  */
 #endif
 #else
-#define OPT_SIZE 64
+#define OPT_FIELD_SIZE 64
 #endif
 
 struct Bootp_t {
@@ -48,11 +48,10 @@ struct Bootp_t {
 	uchar		bp_chaddr[16];	/* Client hardware address	*/
 	char		bp_sname[64];	/* Server host name		*/
 	char		bp_file[128];	/* Boot file name		*/
-	char		bp_vend[OPT_SIZE];	/* Vendor information	*/
+	char		bp_vend[OPT_FIELD_SIZE]; /* Vendor information	*/
 };
 
 #define BOOTP_HDR_SIZE	sizeof(struct Bootp_t)
-#define BOOTP_SIZE	(ETHER_HDR_SIZE + IP_UDP_HDR_SIZE + BOOTP_HDR_SIZE)
 
 /**********************************************************************/
 /*