[PATCH net] ipvlan: fix IFLA_MTU ignored on NEWLINK

[Xin Long]

Commit 296d48568042 ("ipvlan: inherit MTU from master device") adjusted
the mtu from the master device when creating a ipvlan device, but it
would also override the mtu value set in rtnl_create_link. It causes
IFLA_MTU param not to take effect.

So this patch is to not adjust the mtu if IFLA_MTU param is set when
creating a ipvlan device.

Fixes: 296d48568042 ("ipvlan: inherit MTU from master device")
Reported-by: Jianlin Shi <ji...@redhat.com>
Signed-off-by: Xin Long <lucien....@gmail.com>
---
 drivers/net/ipvlan/ipvlan_main.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ipvlan/ipvlan_main.c b/drivers/net/ipvlan/ipvlan_main.c
index d02f0a7..23c1d660 100644
--- a/drivers/net/ipvlan/ipvlan_main.c
+++ b/drivers/net/ipvlan/ipvlan_main.c
@@ -594,7 +594,8 @@ int ipvlan_link_new(struct net *src_net, struct net_device 
*dev,
        ipvlan->phy_dev = phy_dev;
        ipvlan->dev = dev;
        ipvlan->sfeatures = IPVLAN_FEATURES;
-       ipvlan_adjust_mtu(ipvlan, phy_dev);
+       if (!tb[IFLA_MTU])
+               ipvlan_adjust_mtu(ipvlan, phy_dev);
        INIT_LIST_HEAD(&ipvlan->addrs);
        spin_lock_init(&ipvlan->addrs_lock);
 
-- 
2.1.0