net: macvlan: change schedule system_wq to system_unbound_wq

For FT2000+/64 devices,
when four virtual machines share the same physical network interface,
DROP will occur due to the single core CPU performance problem.

ip_check_defrag and macvlan_process_broadcast is on the same CPU.
When the MACVLAN PORT increases, the CPU usage reaches more than 90%.
bc_queue > bc_queue_len_used (default 1000), causing DROP.
Signed-off-by: zhangxiangqian <zhangxiangqian@kylinos.cn>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/macvlan.c

@@ -361,7 +361,7 @@ static void macvlan_broadcast_enqueue(struct macvlan_port *port,
 	}
 	spin_unlock(&port->bc_queue.lock);
 
-	schedule_work(&port->bc_work);
+	queue_work(system_unbound_wq, &port->bc_work);
 
 	if (err)
 		goto free_nskb;