[PATCH 4.4 14/75] vxlan: Accept user specified MTU value when create new vxlan link

Greg Kroah-Hartman
2016-06-22T22:41:46Z

From: Chen Haiquan <oc@yunify.com>

[ Upstream commit ce577668a426c6a9e2470a09dcd07fbd6e45272a ]

When create a new vxlan link, example:
ip link add vtap mtu 1440 type vxlan vni 1 dev eth0

The argument "mtu" has no effect, because it is not set to conf->mtu. The
default value is used in vxlan_dev_configure function.

This problem was introduced by commit 0dfbdf4102b9 (vxlan: Factor out device
configuration).

Fixes: 0dfbdf4102b9 (vxlan: Factor out device configuration)
Signed-off-by: Chen Haiquan <oc@yunify.com>
Acked-by: Cong Wang <xiyou.wangcong@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
drivers/net/vxlan.c | 3 +++
1 file changed, 3 insertions(+)

--- a/drivers/net/vxlan.c
+++ b/drivers/net/vxlan.c
@@ -2985,6 +2985,9 @@ static int vxlan_newlink(struct net *src
if (data[IFLA_VXLAN_REMCSUM_NOPARTIAL])
conf.flags |= VXLAN_F_REMCSUM_NOPARTIAL;

+ if (tb[IFLA_MTU])
+ conf.mtu = nla_get_u32(tb[IFLA_MTU]);
+
err = vxlan_dev_configure(src_net, dev, &conf);
switch (err) {