Phonet: allocate separate ARP type for GPRS over a Phonet pipe

A separate xmit lock class supports GPRS over a Phonet pipe over a TUN
device (type ARPHRD_NONE).
Signed-off-by: NRémi Denis-Courmont <remi.denis-courmont@nokia.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

include/linux/if_arp.h

@@ -88,6 +88,7 @@
 #define ARPHRD_IEEE80211_RADIOTAP 803	/* IEEE 802.11 + radiotap header */
 
 #define ARPHRD_PHONET	820		/* PhoNet media type		*/
+#define ARPHRD_PHONET_PIPE 821		/* PhoNet pipe header		*/
 
 #define ARPHRD_VOID	  0xFFFF	/* Void type, nothing is known */
 #define ARPHRD_NONE	  0xFFFE	/* zero header length */

net/core/dev.c

@@ -284,7 +284,7 @@ static const unsigned short netdev_lock_type[] =
 	 ARPHRD_IRDA, ARPHRD_FCPP, ARPHRD_FCAL, ARPHRD_FCPL,
 	 ARPHRD_FCFABRIC, ARPHRD_IEEE802_TR, ARPHRD_IEEE80211,
 	 ARPHRD_IEEE80211_PRISM, ARPHRD_IEEE80211_RADIOTAP, ARPHRD_PHONET,
-	 ARPHRD_VOID, ARPHRD_NONE};
+	 ARPHRD_PHONET_PIPE, ARPHRD_VOID, ARPHRD_NONE};
 
 static const char *netdev_lock_name[] =
 	{"_xmit_NETROM", "_xmit_ETHER", "_xmit_EETHER", "_xmit_AX25",
@@ -301,7 +301,7 @@ static const char *netdev_lock_name[] =
 	 "_xmit_IRDA", "_xmit_FCPP", "_xmit_FCAL", "_xmit_FCPL",
 	 "_xmit_FCFABRIC", "_xmit_IEEE802_TR", "_xmit_IEEE80211",
 	 "_xmit_IEEE80211_PRISM", "_xmit_IEEE80211_RADIOTAP", "_xmit_PHONET",
-	 "_xmit_VOID", "_xmit_NONE"};
+	 "_xmit_PHONET_PIPE", "_xmit_VOID", "_xmit_NONE"};
 
 static struct lock_class_key netdev_xmit_lock_key[ARRAY_SIZE(netdev_lock_type)];
 static struct lock_class_key netdev_addr_lock_key[ARRAY_SIZE(netdev_lock_type)];

net/phonet/pep-gprs.c

@@ -260,7 +260,7 @@ static int gprs_set_mtu(struct net_device *dev, int new_mtu)
 static void gprs_setup(struct net_device *dev)
 {
 	dev->features		= NETIF_F_FRAGLIST;
-	dev->type		= ARPHRD_NONE;
+	dev->type		= ARPHRD_PHONET_PIPE;
 	dev->flags		= IFF_POINTOPOINT | IFF_NOARP;
 	dev->mtu		= GPRS_DEFAULT_MTU;
 	dev->hard_header_len	= 0;