bonding: enable gro by default

gro can be enabled by default on bonding devices.

Actual support depends on the lower devices.

One can still use ethtool to switch off GRO if needed.
Signed-off-by: NEric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

drivers/net/bonding/bond_main.c

@@ -4678,6 +4678,10 @@ static void bond_setup(struct net_device *bond_dev)
 			       NETIF_F_HW_VLAN_RX |
 			       NETIF_F_HW_VLAN_FILTER);
 
+	/* By default, we enable GRO on bonding devices.
+	 * Actual support requires lowlevel drivers are GRO ready.
+	 */
+	bond_dev->features |= NETIF_F_GRO;
 }
 
 static void bond_work_cancel_all(struct bonding *bond)