From mboxrd@z Thu Jan  1 00:00:00 1970
From: Stephen Hemminger <shemming@brocade.com>
Subject: [PATCH net] gre: allow live address change
Date: Sat, 27 Dec 2014 10:01:42 -0800
Message-ID: <20141227100142.13b7ed79@urahara>
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Cc: <netdev@vger.kernel.org>
To: David Miller <davem@davemloft.net>
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The GRE tap device supports Ethernet over GRE, but doesn't
care about the source address of the tunnel, therefore it
can be changed without bring device down.

Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>

--- a/net/ipv4/ip_gre.c	2014-12-27 09:43:49.070032631 -0800
+++ b/net/ipv4/ip_gre.c	2014-12-27 09:43:49.066032607 -0800
@@ -673,6 +673,7 @@ static bool ipgre_netlink_encap_parms(st
 static int gre_tap_init(struct net_device *dev)
 {
 	__gre_tunnel_init(dev);
+	dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
 
 	return ip_tunnel_init(dev);
 }