IB/mlx4: Implement ib_device callbacks

get_netdev: get the net_device on the physical port of the IB transport port. In
port aggregation mode it is required to return the netdev of the active port.

modify_gid: note for a change in the RoCE gid cache. Handle this by writing to
the harsware GID table. It is possible that indexes in cahce and hardware tables
won't match so a translation is required when modifying a QP or creating an
address handle.

Signed-off-by: Moni Shoua <monis@mellanox.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>
diff --git a/drivers/infiniband/core/cache.c b/drivers/infiniband/core/cache.c
index fc39a2f..8f66c67 100644
--- a/drivers/infiniband/core/cache.c
+++ b/drivers/infiniband/core/cache.c
@@ -55,7 +55,8 @@
 	u8                 port_num;
 };
 
-static union ib_gid zgid;
+union ib_gid zgid;
+EXPORT_SYMBOL(zgid);
 
 static const struct ib_gid_attr zattr;