From: Xin Long <lucien.xin@gmail.com>
Date: Mon, 18 Dec 2017 14:24:35 +0800
Subject: ip_gre: remove the incorrect mtu limit for ipgre tap
Patch-mainline: v4.15-rc5
Git-commit: cfddd4c33c254954927942599d299b3865743146
References: bsc#1056787
ipgre tap driver calls ether_setup(), after commit 61e84623ace3
("net: centralize net_device min/max MTU checking"), the range
of mtu is [min_mtu, max_mtu], which is [68, 1500] by default.
It causes the dev mtu of the ipgre tap device to not be greater
than 1500, this limit value is not correct for ipgre tap device.
Besides, it's .change_mtu already does the right check. So this
patch is just to set max_mtu as 0, and leave the check to it's
.change_mtu.
Fixes: 61e84623ace3 ("net: centralize net_device min/max MTU checking")
Reported-by: Jianlin Shi <jishi@redhat.com>
Signed-off-by: Xin Long <lucien.xin@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Acked-by: Thomas Bogendoerfer <tbogendoerfer@suse.de>
---
net/ipv4/ip_gre.c | 1 +
1 file changed, 1 insertion(+)
--- a/net/ipv4/ip_gre.c
+++ b/net/ipv4/ip_gre.c
@@ -950,6 +950,7 @@ static const struct net_device_ops gre_t
static void ipgre_tap_setup(struct net_device *dev)
{
ether_setup(dev);
+ dev->max_mtu = 0;
dev->netdev_ops = &gre_tap_netdev_ops;
dev->priv_flags &= ~IFF_TX_SKB_SHARING;
dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;