IB/uverbs: Return link layer type to userspace for query port operation

Signed-off-by: Eli Cohen <[e-mail]>
Signed-off-by: Roland Dreier <[e-mail]>

drivers/infiniband/core/uverbs_cmd.c

···
 	resp.active_width    = attr.active_width;
 	resp.active_speed    = attr.active_speed;
 	resp.phys_state      = attr.phys_state;
+	resp.link_layer      = rdma_port_get_link_layer(file->device->ib_dev,
+							cmd.port_num);
 
 	if (copy_to_user((void __user *) (unsigned long) cmd.response,
 			 &resp, sizeof resp))

include/rdma/ib_user_verbs.h

···
 	__u8  active_width;
 	__u8  active_speed;
 	__u8  phys_state;
-	__u8  reserved[3];
+	__u8  link_layer;
+	__u8  reserved[2];
 };
 
 struct ib_uverbs_alloc_pd {