[NET] loopback: Added support for SG

Just like the standard loopback device, SG support here is innate.
So all we need to do is mark it as such and zero the change_mtu method
so that the MTU can be changed at will.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

diff --git a/linux-2.6-xen-sparse/drivers/xen/netback/loopback.c b/linux-2.6-xen-sparse/drivers/xen/netback/loopback.c
index 7e8c4b0bc02cdf48be52b6e2b0975914b5a5fec1..e9337b0005a609fe8412916276b60920840d5f51 100644 (file)
--- a/linux-2.6-xen-sparse/drivers/xen/netback/loopback.c
+++ b/linux-2.6-xen-sparse/drivers/xen/netback/loopback.c
@@ -146,11 +146,13 @@ static void loopback_construct(struct net_device *dev, struct net_device *lo)
        dev->hard_start_xmit = loopback_start_xmit;
        dev->get_stats       = loopback_get_stats;
        dev->set_multicast_list = loopback_set_multicast_list;
+       dev->change_mtu      = NULL; /* allow arbitrary mtu */
 
        dev->tx_queue_len    = 0;
 
        dev->features        = (NETIF_F_HIGHDMA |
                                NETIF_F_LLTX |
+                               NETIF_F_SG |
                                NETIF_F_IP_CSUM);
 
        SET_ETHTOOL_OPS(dev, &network_ethtool_ops);