--- zzzz-none-000/linux-4.9.279/drivers/net/macvlan.c	2021-08-08 06:38:54.000000000 +0000
+++ puma7-atom-6591-750/linux-4.9.279/drivers/net/macvlan.c	2023-02-08 11:43:42.000000000 +0000
@@ -786,7 +786,7 @@
 {
 	struct macvlan_dev *vlan = netdev_priv(dev);
 
-	if (new_mtu < 68 || vlan->lowerdev->mtu < new_mtu)
+	if (vlan->lowerdev->mtu < new_mtu)
 		return -EINVAL;
 	dev->mtu = new_mtu;
 	return 0;
@@ -1094,6 +1094,8 @@
 {
 	ether_setup(dev);
 
+	dev->min_mtu		= 0;
+	dev->max_mtu		= ETH_MAX_MTU;
 	dev->priv_flags	       &= ~IFF_TX_SKB_SHARING;
 	netif_keep_dst(dev);
 	dev->priv_flags	       |= IFF_UNICAST_FLT;
@@ -1316,6 +1318,10 @@
 	else if (dev->mtu > lowerdev->mtu)
 		return -EINVAL;
 
+	/* MTU range: 68 - lowerdev->max_mtu */
+	dev->min_mtu = ETH_MIN_MTU;
+	dev->max_mtu = lowerdev->max_mtu;
+
 	if (!tb[IFLA_ADDRESS])
 		eth_hw_addr_random(dev);