[IPV6]: ARCnet support, driver side.

drivers/net/arcnet/arcnet.c

@@ -340,7 +340,7 @@ void arcdev_setup(struct net_device *dev)
 	dev->hard_header_len = sizeof(struct archdr);
 	dev->mtu = choose_mtu();
 
-	dev->addr_len = 1;
+	dev->addr_len = ARCNET_ALEN;
 	dev->tx_queue_len = 30;
 	dev->broadcast[0] = 0x00;	/* for us, broadcasts are address 0 */
 	dev->watchdog_timeo = TX_TIMEOUT;

drivers/net/arcnet/rfc1201.c

@@ -56,6 +56,7 @@ struct ArcProto rfc1201_proto =
 void __init arcnet_rfc1201_init(void)
 {
 	arc_proto_map[ARC_P_IP]
+	    = arc_proto_map[ARC_P_IPV6]
 	    = arc_proto_map[ARC_P_ARP]
 	    = arc_proto_map[ARC_P_RARP]
 	    = arc_proto_map[ARC_P_IPX]
@@ -114,6 +115,8 @@ static unsigned short type_trans(struct sk_buff *skb, struct net_device *dev)
 	switch (soft->proto) {
 	case ARC_P_IP:
 		return htons(ETH_P_IP);
+	case ARC_P_IPV6:
+		return htons(ETH_P_IPV6);
 	case ARC_P_ARP:
 		return htons(ETH_P_ARP);
 	case ARC_P_RARP:
@@ -389,6 +392,9 @@ static int build_header(struct sk_buff *skb, unsigned short type,
 	case ETH_P_IP:
 		soft->proto = ARC_P_IP;
 		break;
+	case ETH_P_IPV6:
+		soft->proto = ARC_P_IPV6;
+		break;
 	case ETH_P_ARP:
 		soft->proto = ARC_P_ARP;
 		break;

include/linux/if_arcnet.h

@@ -25,6 +25,7 @@
 
 /* RFC1201 Protocol ID's */
 #define ARC_P_IP		212	/* 0xD4 */
+#define ARC_P_IPV6		196	/* 0xC4: RFC2497 */
 #define ARC_P_ARP		213	/* 0xD5 */
 #define ARC_P_RARP		214	/* 0xD6 */
 #define ARC_P_IPX		250	/* 0xFA */
@@ -45,6 +46,9 @@
 #define ARC_P_LANSOFT		251	/* 0xFB - what is this? */
 #define ARC_P_ATALK		0xDD
 
+/* Hardware address length */
+#define ARCNET_ALEN	1
+
 /*
  * The RFC1201-specific components of an arcnet packet header.
  */