From: Xin Long lucien.xin@gmail.com
[ Upstream commit cfddd4c33c254954927942599d299b3865743146 ]
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 Signed-off-by: Sasha Levin alexander.levin@microsoft.com --- net/ipv4/ip_gre.c | 1 + 1 file changed, 1 insertion(+)
diff --git a/net/ipv4/ip_gre.c b/net/ipv4/ip_gre.c index 045331204097..1933654007c4 100644 --- a/net/ipv4/ip_gre.c +++ b/net/ipv4/ip_gre.c @@ -1274,6 +1274,7 @@ static const struct net_device_ops erspan_netdev_ops = { 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;