[netdevice] Add method for generating EUI-64 address from link-layer address

Signed-off-by: Michael Brown <mcb30@ipxe.org>

src/drivers/net/ipoib.c

 	.ntoa		= eth_ntoa,
 	.mc_hash	= eth_mc_hash,
 	.eth_addr	= eth_eth_addr,
+	.eui64		= eth_eui64,
 	.flags		= LL_NAME_ONLY,
 };
 

src/include/ipxe/ethernet.h

 extern int eth_mc_hash ( unsigned int af, const void *net_addr,
 			 void *ll_addr );
 extern int eth_eth_addr ( const void *ll_addr, void *eth_addr );
+extern int eth_eui64 ( const void *ll_addr, void *eui64 );
 extern struct net_device * alloc_etherdev ( size_t priv_size );
 
 #endif /* _IPXE_ETHERNET_H */

src/include/ipxe/netdevice.h

 	 *
 	 * @v ll_addr		Link-layer address
 	 * @v eth_addr		Ethernet-compatible address to fill in
+	 * @ret rc		Return status code
 	 */
 	int ( * eth_addr ) ( const void *ll_addr, void *eth_addr );
+	/**
+	 * Generate EUI-64 address
+	 *
+	 * @v ll_addr		Link-layer address
+	 * @v eui64		EUI-64 address to fill in
+	 * @ret rc		Return status code
+	 */
+	int ( * eui64 ) ( const void *ll_addr, void *eui64 );
 	/** Link-layer protocol
 	 *
 	 * This is an ARPHRD_XXX constant, in network byte order.

src/net/80211/net80211.c

 	.ntoa = eth_ntoa,
 	.mc_hash = eth_mc_hash,
 	.eth_addr = eth_eth_addr,
+	.eui64 = eth_eui64,
 	.ll_proto = htons ( ARPHRD_ETHER ),	/* "encapsulated Ethernet" */
 	.hw_addr_len = ETH_ALEN,
 	.ll_addr_len = ETH_ALEN,

src/net/ethernet.c

 	return 0;
 }
 
+/**
+ * Generate EUI-64 address
+ *
+ * @v ll_addr		Link-layer address
+ * @v eui64		EUI-64 address to fill in
+ * @ret rc		Return status code
+ */
+int eth_eui64 ( const void *ll_addr, void *eui64 ) {
+
+	memcpy ( ( eui64 + 0 ), ( ll_addr + 0 ), 3 );
+	memcpy ( ( eui64 + 5 ), ( ll_addr + 3 ), 3 );
+	*( ( uint16_t * ) ( eui64 + 3 ) ) = htons ( 0xfffe );
+	return 0;
+}
+
 /** Ethernet protocol */
 struct ll_protocol ethernet_protocol __ll_protocol = {
 	.name		= "Ethernet",
 	.ntoa		= eth_ntoa,
 	.mc_hash	= eth_mc_hash,
 	.eth_addr	= eth_eth_addr,
+	.eui64		= eth_eui64,
 };
 
 /**