ipvlan: fix IFLA_MTU ignored on NEWLINK
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 <jishi@redhat.com>
Signed-off-by: Xin Long <lucien.xin@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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);