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authorHaishuang Yan <yanhaishuang@cmss.chinamobile.com>2019-09-27 14:58:20 +0800
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2019-10-07 18:57:20 +0200
commit7f30c44b7ca43e6960f22e7a1efec30fbfed6bea (patch)
tree9301e01017f75f6b5bdc7607112f81ea1a1252db
parent2b83891122921c4698c8229ea22d618dc509af2c (diff)
erspan: remove the incorrect mtu limit for erspan
[ Upstream commit 0e141f757b2c78c983df893e9993313e2dc21e38 ] erspan 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 erspan device to not be greater than 1500, this limit value is not correct for ipgre tap device. Tested: Before patch: # ip link set erspan0 mtu 1600 Error: mtu greater than device maximum. After patch: # ip link set erspan0 mtu 1600 # ip -d link show erspan0 21: erspan0@NONE: <BROADCAST,MULTICAST> mtu 1600 qdisc noop state DOWN mode DEFAULT group default qlen 1000 link/ether 00:00:00:00:00:00 brd ff:ff:ff:ff:ff:ff promiscuity 0 minmtu 68 maxmtu 0 Fixes: 61e84623ace3 ("net: centralize net_device min/max MTU checking") Signed-off-by: Haishuang Yan <yanhaishuang@cmss.chinamobile.com> Signed-off-by: David S. Miller <davem@davemloft.net> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
-rw-r--r--net/ipv4/ip_gre.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/net/ipv4/ip_gre.c b/net/ipv4/ip_gre.c
index 3c734832bb7c..0b87558f265e 100644
--- a/net/ipv4/ip_gre.c
+++ b/net/ipv4/ip_gre.c
@@ -1531,6 +1531,7 @@ static void erspan_setup(struct net_device *dev)
struct ip_tunnel *t = netdev_priv(dev);
ether_setup(dev);
+ dev->max_mtu = 0;
dev->netdev_ops = &erspan_netdev_ops;
dev->priv_flags &= ~IFF_TX_SKB_SHARING;
dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;