Merge branch 'MTU-core-range-checking-more'

Jarod Wilson says:

====================
net: use core MTU range checking everywhere

This stack of patches should get absolutely everything in the kernel
converted from doing their own MTU range checking to the core MTU range
checking. This second spin includes alterations to hopefully fix all
concerns raised with the first, as well as including some additional
changes to drivers and infrastructure where I completely missed necessary
updates.

These have all been built through the 0-day build infrastructure via the
(rebasing) master branch at https://github.com/jarodwilson/linux-muck, which
at the time of the most recent compile across 147 configs, was based on
net-next at commit 7b1536ef0aa0.
====================

Signed-off-by: David S. Miller <[e-mail]>

arch/um/drivers/net_kern.c

···
 	netif_wake_queue(dev);
 }
 
-static int uml_net_change_mtu(struct net_device *dev, int new_mtu)
-{
-	dev->mtu = new_mtu;
-
-	return 0;
-}
-
 #ifdef CONFIG_NET_POLL_CONTROLLER
 static void uml_net_poll_controller(struct net_device *dev)
 {
···
 	.ndo_set_rx_mode	= uml_net_set_multicast_list,
 	.ndo_tx_timeout 	= uml_net_tx_timeout,
 	.ndo_set_mac_address	= eth_mac_addr,
-	.ndo_change_mtu 	= uml_net_change_mtu,
 	.ndo_validate_addr	= eth_validate_addr,
 #ifdef CONFIG_NET_POLL_CONTROLLER
 	.ndo_poll_controller = uml_net_poll_controller,

drivers/char/pcmcia/synclink_cs.c

···
 static const struct net_device_ops hdlcdev_ops = {
 	.ndo_open       = hdlcdev_open,
 	.ndo_stop       = hdlcdev_close,
-	.ndo_change_mtu = hdlc_change_mtu,
 	.ndo_start_xmit = hdlc_start_xmit,
 	.ndo_do_ioctl   = hdlcdev_ioctl,
 	.ndo_tx_timeout = hdlcdev_tx_timeout,

drivers/firewire/net.c

···
 	return NETDEV_TX_OK;
 }
 
-static int fwnet_change_mtu(struct net_device *net, int new_mtu)
-{
-	if (new_mtu < 68)
-		return -EINVAL;
-
-	net->mtu = new_mtu;
-	return 0;
-}
-
 static const struct ethtool_ops fwnet_ethtool_ops = {
 	.get_link	= ethtool_op_get_link,
 };
···
 	.ndo_open       = fwnet_open,
 	.ndo_stop	= fwnet_stop,
 	.ndo_start_xmit = fwnet_tx,
-	.ndo_change_mtu = fwnet_change_mtu,
 };
 
 static void fwnet_init_dev(struct net_device *net)
···
 	struct net_device *net;
 	bool allocated_netdev = false;
 	struct fwnet_device *dev;
-	unsigned max_mtu;
 	int ret;
 	union fwnet_hwaddr *ha;
 
···
 	 * Use the RFC 2734 default 1500 octets or the maximum payload
 	 * as initial MTU
 	 */
-	max_mtu = (1 << (card->max_receive + 1))
-		  - sizeof(struct rfc2734_header) - IEEE1394_GASP_HDR_SIZE;
-	net->mtu = min(1500U, max_mtu);
+	net->max_mtu = (1 << (card->max_receive + 1))
+		       - sizeof(struct rfc2734_header) - IEEE1394_GASP_HDR_SIZE;
+	net->mtu = min(1500U, net->max_mtu);
+	net->min_mtu = ETH_MIN_MTU;
 
 	/* Set our hardware address while we're at it */
 	ha = (union fwnet_hwaddr *)net->dev_addr;

drivers/hsi/clients/ssi_protocol.c

···
 	return 0;
 }
 
-static int ssip_pn_set_mtu(struct net_device *dev, int new_mtu)
-{
-	if (new_mtu > SSIP_MAX_MTU || new_mtu < PHONET_MIN_MTU)
-		return -EINVAL;
-	dev->mtu = new_mtu;
-
-	return 0;
-}
-
 static void ssip_xmit_work(struct work_struct *work)
 {
 	struct ssi_protocol *ssi =
···
 	.ndo_open	= ssip_pn_open,
 	.ndo_stop	= ssip_pn_stop,
 	.ndo_start_xmit	= ssip_pn_xmit,
-	.ndo_change_mtu	= ssip_pn_set_mtu,
 };
 
 static void ssip_pn_setup(struct net_device *dev)
···
 		err = -ENOMEM;
 		goto out1;
 	}
+
+	/* MTU range: 6 - 65535 */
+	ssi->netdev->min_mtu = PHONET_MIN_MTU;
+	ssi->netdev->max_mtu = SSIP_MAX_MTU;
 
 	SET_NETDEV_DEV(ssi->netdev, dev);
 	netif_carrier_off(ssi->netdev);

drivers/infiniband/hw/nes/nes.c

···
 MODULE_LICENSE("Dual BSD/GPL");
 MODULE_VERSION(DRV_VERSION);
 
-int max_mtu = 9000;
 int interrupt_mod_interval = 0;
 
 /* Interoperability */

drivers/infiniband/hw/nes/nes.h

···
 #define NES_FIRST_QPN           64
 #define NES_SW_CONTEXT_ALIGN    1024
 
+#define NES_MAX_MTU		9000
+
 #define NES_NIC_MAX_NICS        16
 #define NES_MAX_ARP_TABLE_SIZE  4096
 
···
 #include "nes_cm.h"
 #include "nes_mgt.h"
 
-extern int max_mtu;
-#define max_frame_len (max_mtu+ETH_HLEN)
 extern int interrupt_mod_interval;
 extern int nes_if_count;
 extern int mpa_version;

drivers/infiniband/hw/nes/nes_nic.c

···
 {
 	struct nes_vnic	*nesvnic = netdev_priv(netdev);
 	struct nes_device *nesdev = nesvnic->nesdev;
-	int ret = 0;
 	u8 jumbomode = 0;
 	u32 nic_active;
 	u32 nic_active_bit;
 	u32 uc_all_active;
 	u32 mc_all_active;
 
-	if ((new_mtu < ETH_ZLEN) || (new_mtu > max_mtu))
-		return -EINVAL;
-
 	netdev->mtu = new_mtu;
 	nesvnic->max_frame_size	= new_mtu + VLAN_ETH_HLEN;
 
-	if (netdev->mtu	> 1500)	{
+	if (netdev->mtu	> ETH_DATA_LEN)	{
 		jumbomode=1;
 	}
 	nes_nic_init_timer_defaults(nesdev, jumbomode);
···
 		nes_write_indexed(nesdev, NES_IDX_NIC_UNICAST_ALL, nic_active);
 	}
 
-	return ret;
+	return 0;
 }
 
 
···
 
 	netdev->watchdog_timeo = NES_TX_TIMEOUT;
 	netdev->irq = nesdev->pcidev->irq;
-	netdev->mtu = ETH_DATA_LEN;
+	netdev->max_mtu = NES_MAX_MTU;
 	netdev->hard_header_len = ETH_HLEN;
 	netdev->addr_len = ETH_ALEN;
 	netdev->type = ARPHRD_ETHER;

drivers/infiniband/ulp/ipoib/ipoib_main.c

···
 	/* MTU will be reset when mcast join happens */
 	priv->dev->mtu  = IPOIB_UD_MTU(priv->max_ib_mtu);
 	priv->mcast_mtu  = priv->admin_mtu = priv->dev->mtu;
+	priv->dev->max_mtu = IPOIB_CM_MTU;
 
 	priv->dev->neigh_priv_len = sizeof(struct ipoib_neigh);
 

drivers/message/fusion/mptlan.c

···
 }
 
 /*=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=*/
-static int
-mpt_lan_change_mtu(struct net_device *dev, int new_mtu)
-{
-	if ((new_mtu < MPT_LAN_MIN_MTU) || (new_mtu > MPT_LAN_MAX_MTU))
-		return -EINVAL;
-	dev->mtu = new_mtu;
-	return 0;
-}
-
-/*=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=*/
 /* Tx timeout handler. */
 static void
 mpt_lan_tx_timeout(struct net_device *dev)
···
 	.ndo_open       = mpt_lan_open,
 	.ndo_stop       = mpt_lan_close,
 	.ndo_start_xmit = mpt_lan_sdu_send,
-	.ndo_change_mtu = mpt_lan_change_mtu,
 	.ndo_tx_timeout = mpt_lan_tx_timeout,
 };
 
···
 
 	dev->netdev_ops = &mpt_netdev_ops;
 	dev->watchdog_timeo = MPT_LAN_TX_TIMEOUT;
+
+	/* MTU range: 96 - 65280 */
+	dev->min_mtu = MPT_LAN_MIN_MTU;
+	dev->max_mtu = MPT_LAN_MAX_MTU;
 
 	dlprintk((KERN_INFO MYNAM ": Finished registering dev "
 		"and setting initial values\n"));

drivers/misc/sgi-xp/xpnet.c

···
  * now, the default is 64KB.
  */
 #define XPNET_MAX_MTU (0x800000UL - L1_CACHE_BYTES)
+/* 68 comes from min TCP+IP+MAC header */
+#define XPNET_MIN_MTU 68
 /* 32KB has been determined to be the ideal */
 #define XPNET_DEF_MTU (0x8000UL)
 
···
 	return 0;
 }
 
-static int
-xpnet_dev_change_mtu(struct net_device *dev, int new_mtu)
-{
-	/* 68 comes from min TCP+IP+MAC header */
-	if ((new_mtu < 68) || (new_mtu > XPNET_MAX_MTU)) {
-		dev_err(xpnet, "ifconfig %s mtu %d failed; value must be "
-			"between 68 and %ld\n", dev->name, new_mtu,
-			XPNET_MAX_MTU);
-		return -EINVAL;
-	}
-
-	dev->mtu = new_mtu;
-	dev_dbg(xpnet, "ifconfig %s mtu set to %d\n", dev->name, new_mtu);
-	return 0;
-}
-
 /*
  * Notification that the other end has received the message and
  * DMA'd the skb information.  At this point, they are done with
···
 	.ndo_open		= xpnet_dev_open,
 	.ndo_stop		= xpnet_dev_stop,
 	.ndo_start_xmit		= xpnet_dev_hard_start_xmit,
-	.ndo_change_mtu		= xpnet_dev_change_mtu,
 	.ndo_tx_timeout		= xpnet_dev_tx_timeout,
 	.ndo_set_mac_address 	= eth_mac_addr,
 	.ndo_validate_addr	= eth_validate_addr,
···
 
 	xpnet_device->netdev_ops = &xpnet_netdev_ops;
 	xpnet_device->mtu = XPNET_DEF_MTU;
+	xpnet_device->min_mtu = XPNET_MIN_MTU;
+	xpnet_device->max_mtu = XPNET_MAX_MTU;
 
 	/*
 	 * Multicast assumes the LSB of the first octet is set for multicast

drivers/net/ethernet/alteon/acenic.c

···
 	dev->features |= NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_CTAG_RX;
 
 	dev->watchdog_timeo = 5*HZ;
+	dev->min_mtu = 0;
+	dev->max_mtu = ACE_JUMBO_MTU;
 
 	dev->netdev_ops = &ace_netdev_ops;
 	dev->ethtool_ops = &ace_ethtool_ops;
···
 {
 	struct ace_private *ap = netdev_priv(dev);
 	struct ace_regs __iomem *regs = ap->regs;
-
-	if (new_mtu > ACE_JUMBO_MTU)
-		return -EINVAL;
 
 	writel(new_mtu + ETH_HLEN + 4, &regs->IfMtu);
 	dev->mtu = new_mtu;

drivers/net/ethernet/amazon/ena/ena_netdev.c

···
 	struct ena_adapter *adapter = netdev_priv(dev);
 	int ret;
 
-	if ((new_mtu > adapter->max_mtu) || (new_mtu < ENA_MIN_MTU)) {
-		netif_err(adapter, drv, dev,
-			  "Invalid MTU setting. new_mtu: %d\n", new_mtu);
-
-		return -EINVAL;
-	}
-
 	ret = ena_com_set_dev_mtu(adapter->ena_dev, new_mtu);
 	if (!ret) {
 		netif_dbg(adapter, drv, dev, "set MTU to %d\n", new_mtu);
···
 	ena_set_dev_offloads(feat, netdev);
 
 	adapter->max_mtu = feat->dev_attr.max_mtu;
+	netdev->max_mtu = adapter->max_mtu;
+	netdev->min_mtu = ENA_MIN_MTU;
 }
 
 static int ena_rss_init_default(struct ena_adapter *adapter)

drivers/net/ethernet/amd/xgbe/xgbe-drv.c

···
 {
 	unsigned int rx_buf_size;
 
-	if (mtu > XGMAC_JUMBO_PACKET_MTU) {
-		netdev_alert(netdev, "MTU exceeds maximum supported value\n");
-		return -EINVAL;
-	}
-
 	rx_buf_size = mtu + ETH_HLEN + ETH_FCS_LEN + VLAN_HLEN;
 	rx_buf_size = clamp_val(rx_buf_size, XGBE_RX_MIN_BUF_SIZE, PAGE_SIZE);
 

drivers/net/ethernet/amd/xgbe/xgbe-main.c

···
 	pdata->netdev_features = netdev->features;
 
 	netdev->priv_flags |= IFF_UNICAST_FLT;
+	netdev->min_mtu = 0;
+	netdev->max_mtu = XGMAC_JUMBO_PACKET_MTU;
 
 	/* Use default watchdog timeout */
 	netdev->watchdog_timeo = 0;

drivers/net/ethernet/broadcom/sb1250-mac.c

···
 	}
 }
 
-static int sb1250_change_mtu(struct net_device *_dev, int new_mtu)
-{
-	if (new_mtu >  ENET_PACKET_SIZE)
-		return -EINVAL;
-	_dev->mtu = new_mtu;
-	pr_info("changing the mtu to %d\n", new_mtu);
-	return 0;
-}
-
 static const struct net_device_ops sbmac_netdev_ops = {
 	.ndo_open		= sbmac_open,
 	.ndo_stop		= sbmac_close,
···
 	.ndo_set_rx_mode	= sbmac_set_rx_mode,
 	.ndo_tx_timeout		= sbmac_tx_timeout,
 	.ndo_do_ioctl		= sbmac_mii_ioctl,
-	.ndo_change_mtu		= sb1250_change_mtu,
 	.ndo_validate_addr	= eth_validate_addr,
 	.ndo_set_mac_address	= eth_mac_addr,
 #ifdef CONFIG_NET_POLL_CONTROLLER
···
 
 	dev->netdev_ops = &sbmac_netdev_ops;
 	dev->watchdog_timeo = TX_TIMEOUT;
+	dev->max_mtu = 0;
+	dev->max_mtu = ENET_PACKET_SIZE;
 
 	netif_napi_add(dev, &sc->napi, sbmac_poll, 16);
 

drivers/net/ethernet/chelsio/cxgb3/cxgb3_main.c

···
 	struct adapter *adapter = pi->adapter;
 	int ret;
 
-	if (new_mtu < 81)	/* accommodate SACK */
-		return -EINVAL;
 	if ((ret = t3_mac_set_mtu(&pi->mac, new_mtu)))
 		return ret;
 	dev->mtu = new_mtu;
···
 
 		netdev->netdev_ops = &cxgb_netdev_ops;
 		netdev->ethtool_ops = &cxgb_ethtool_ops;
+		netdev->min_mtu = 81;
+		netdev->max_mtu = ETH_MAX_MTU;
 	}
 
 	pci_set_drvdata(pdev, adapter);

drivers/net/ethernet/chelsio/cxgb4/cxgb4_main.c

···
 	int ret;
 	struct port_info *pi = netdev_priv(dev);
 
-	if (new_mtu < 81 || new_mtu > MAX_MTU)         /* accommodate SACK */
-		return -EINVAL;
 	ret = t4_set_rxmode(pi->adapter, pi->adapter->pf, pi->viid, new_mtu, -1,
 			    -1, -1, -1, true);
 	if (!ret)
···
 		netdev->vlan_features = netdev->features & VLAN_FEAT;
 
 		netdev->priv_flags |= IFF_UNICAST_FLT;
+
+		/* MTU range: 81 - 9600 */
+		netdev->min_mtu = 81;
+		netdev->max_mtu = MAX_MTU;
 
 		netdev->netdev_ops = &cxgb4_netdev_ops;
 #ifdef CONFIG_CHELSIO_T4_DCB

drivers/net/ethernet/chelsio/cxgb4vf/cxgb4vf_main.c

···
 	int ret;
 	struct port_info *pi = netdev_priv(dev);
 
-	/* accommodate SACK */
-	if (new_mtu < 81)
-		return -EINVAL;
-
 	ret = t4vf_set_rxmode(pi->adapter, pi->viid, new_mtu,
 			      -1, -1, -1, -1, true);
 	if (!ret)
···
 			netdev->features |= NETIF_F_HIGHDMA;
 
 		netdev->priv_flags |= IFF_UNICAST_FLT;
+		netdev->min_mtu = 81;
+		netdev->max_mtu = ETH_MAX_MTU;
 
 		netdev->netdev_ops = &cxgb4vf_netdev_ops;
 		netdev->ethtool_ops = &cxgb4vf_ethtool_ops;

drivers/net/ethernet/emulex/benet/be_main.c

···
 	return NETDEV_TX_OK;
 }
 
-static int be_change_mtu(struct net_device *netdev, int new_mtu)
-{
-	struct be_adapter *adapter = netdev_priv(netdev);
-	struct device *dev = &adapter->pdev->dev;
-
-	if (new_mtu < BE_MIN_MTU || new_mtu > BE_MAX_MTU) {
-		dev_info(dev, "MTU must be between %d and %d bytes\n",
-			 BE_MIN_MTU, BE_MAX_MTU);
-		return -EINVAL;
-	}
-
-	dev_info(dev, "MTU changed from %d to %d bytes\n",
-		 netdev->mtu, new_mtu);
-	netdev->mtu = new_mtu;
-	return 0;
-}
-
 static inline bool be_in_all_promisc(struct be_adapter *adapter)
 {
 	return (adapter->if_flags & BE_IF_FLAGS_ALL_PROMISCUOUS) ==
···
 	.ndo_start_xmit		= be_xmit,
 	.ndo_set_rx_mode	= be_set_rx_mode,
 	.ndo_set_mac_address	= be_mac_addr_set,
-	.ndo_change_mtu		= be_change_mtu,
 	.ndo_get_stats64	= be_get_stats64,
 	.ndo_validate_addr	= eth_validate_addr,
 	.ndo_vlan_rx_add_vid	= be_vlan_add_vid,
···
 	netdev->netdev_ops = &be_netdev_ops;
 
 	netdev->ethtool_ops = &be_ethtool_ops;
+
+	/* MTU range: 256 - 9000 */
+	netdev->min_mtu = BE_MIN_MTU;
+	netdev->max_mtu = BE_MAX_MTU;
 }
 
 static void be_cleanup(struct be_adapter *adapter)

drivers/net/ethernet/ibm/ibmveth.c

···
 	int i, rc;
 	int need_restart = 0;
 
-	if (new_mtu < IBMVETH_MIN_MTU)
-		return -EINVAL;
-
 	for (i = 0; i < IBMVETH_NUM_BUFF_POOLS; i++)
 		if (new_mtu_oh <= adapter->rx_buff_pool[i].buff_size)
 			break;
···
 	} else {
 		netdev->hw_features |= NETIF_F_TSO;
 	}
+
+	netdev->min_mtu = IBMVETH_MIN_MTU;
+	netdev->min_mtu = ETH_MAX_MTU;
 
 	memcpy(netdev->dev_addr, mac_addr_p, ETH_ALEN);
 

drivers/net/ethernet/ibm/ibmvnic.c

···
 	return 0;
 }
 
-static int ibmvnic_change_mtu(struct net_device *netdev, int new_mtu)
-{
-	struct ibmvnic_adapter *adapter = netdev_priv(netdev);
-
-	if (new_mtu > adapter->req_mtu || new_mtu < adapter->min_mtu)
-		return -EINVAL;
-
-	netdev->mtu = new_mtu;
-	return 0;
-}
-
 static void ibmvnic_tx_timeout(struct net_device *dev)
 {
 	struct ibmvnic_adapter *adapter = netdev_priv(dev);
···
 	.ndo_set_rx_mode	= ibmvnic_set_multi,
 	.ndo_set_mac_address	= ibmvnic_set_mac,
 	.ndo_validate_addr	= eth_validate_addr,
-	.ndo_change_mtu		= ibmvnic_change_mtu,
 	.ndo_tx_timeout		= ibmvnic_tx_timeout,
 #ifdef CONFIG_NET_POLL_CONTROLLER
 	.ndo_poll_controller	= ibmvnic_netpoll_controller,
···
 		break;
 	case MIN_MTU:
 		adapter->min_mtu = be64_to_cpu(crq->query_capability.number);
+		netdev->min_mtu = adapter->min_mtu;
 		netdev_dbg(netdev, "min_mtu = %lld\n", adapter->min_mtu);
 		break;
 	case MAX_MTU:
 		adapter->max_mtu = be64_to_cpu(crq->query_capability.number);
+		netdev->max_mtu = adapter->max_mtu;
 		netdev_dbg(netdev, "max_mtu = %lld\n", adapter->max_mtu);
 		break;
 	case MAX_MULTICAST_FILTERS:
···
 		goto task_failed;
 
 	netdev->real_num_tx_queues = adapter->req_tx_queues;
+	netdev->min_mtu = adapter->min_mtu;
+	netdev->max_mtu = adapter->max_mtu;
 
 	if (adapter->failover) {
 		adapter->failover = false;

drivers/net/ethernet/jme.c

···
 {
 	struct jme_adapter *jme = netdev_priv(netdev);
 
-	if (new_mtu == jme->old_mtu)
-		return 0;
-
-	if (((new_mtu + ETH_HLEN) > MAX_ETHERNET_JUMBO_PACKET_SIZE) ||
-		((new_mtu) < IPV6_MIN_MTU))
-		return -EINVAL;
-
-
 	netdev->mtu = new_mtu;
 	netdev_update_features(netdev);
 
···
 						NETIF_F_HW_VLAN_CTAG_RX;
 	if (using_dac)
 		netdev->features	|=	NETIF_F_HIGHDMA;
+
+	/* MTU range: 1280 - 9202*/
+	netdev->min_mtu = IPV6_MIN_MTU;
+	netdev->max_mtu = MAX_ETHERNET_JUMBO_PACKET_SIZE - ETH_HLEN;
 
 	SET_NETDEV_DEV(netdev, &pdev->dev);
 	pci_set_drvdata(pdev, netdev);

drivers/net/ethernet/marvell/mv643xx_eth.c

···
 {
 	struct mv643xx_eth_private *mp = netdev_priv(dev);
 
-	if (new_mtu < 64 || new_mtu > 9500)
-		return -EINVAL;
-
 	dev->mtu = new_mtu;
 	mv643xx_eth_recalc_skb_size(mp);
 	tx_set_rate(mp, 1000000000, 16777216);
···
 
 	dev->priv_flags |= IFF_UNICAST_FLT;
 	dev->gso_max_segs = MV643XX_MAX_TSO_SEGS;
+
+	/* MTU range: 64 - 9500 */
+	dev->min_mtu = 64;
+	dev->max_mtu = 9500;
 
 	SET_NETDEV_DEV(dev, &pdev->dev);
 

drivers/net/ethernet/mellanox/mlxsw/spectrum.c

···
 			 NETIF_F_HW_VLAN_CTAG_FILTER | NETIF_F_HW_TC;
 	dev->hw_features |= NETIF_F_HW_TC;
 
+	dev->min_mtu = 0;
+	dev->max_mtu = ETH_MAX_MTU;
+
 	/* Each packet needs to have a Tx header (metadata) on top all other
 	 * headers.
 	 */

drivers/net/ethernet/mellanox/mlxsw/switchx2.c

···
 	dev->features |= NETIF_F_NETNS_LOCAL | NETIF_F_LLTX | NETIF_F_SG |
 			 NETIF_F_VLAN_CHALLENGED;
 
+	dev->min_mtu = 0;
+	dev->max_mtu = ETH_MAX_MTU;
+
 	/* Each packet needs to have a Tx header (metadata) on top all other
 	 * headers.
 	 */

drivers/net/ethernet/natsemi/ns83820.c

···
 	}
 }
 
-static int ns83820_change_mtu(struct net_device *ndev, int new_mtu)
-{
-	if (new_mtu > RX_BUF_SIZE)
-		return -EINVAL;
-	ndev->mtu = new_mtu;
-	return 0;
-}
-
 static void ns83820_set_multicast(struct net_device *ndev)
 {
 	struct ns83820 *dev = PRIV(ndev);
···
 	.ndo_stop		= ns83820_stop,
 	.ndo_start_xmit		= ns83820_hard_start_xmit,
 	.ndo_get_stats		= ns83820_get_stats,
-	.ndo_change_mtu		= ns83820_change_mtu,
 	.ndo_set_rx_mode	= ns83820_set_multicast,
 	.ndo_validate_addr	= eth_validate_addr,
 	.ndo_set_mac_address	= eth_mac_addr,
···
 	/* Yes, we support dumb IP checksum on transmit */
 	ndev->features |= NETIF_F_SG;
 	ndev->features |= NETIF_F_IP_CSUM;
+
+	ndev->min_mtu = 0;
 
 #ifdef NS83820_VLAN_ACCEL_SUPPORT
 	/* We also support hardware vlan acceleration */

drivers/net/ethernet/qlogic/netxen/netxen_nic_hw.c

···
 int netxen_nic_change_mtu(struct net_device *netdev, int mtu)
 {
 	struct netxen_adapter *adapter = netdev_priv(netdev);
-	int max_mtu;
 	int rc = 0;
-
-	if (NX_IS_REVISION_P3(adapter->ahw.revision_id))
-		max_mtu = P3_MAX_MTU;
-	else
-		max_mtu = P2_MAX_MTU;
-
-	if (mtu > max_mtu) {
-		printk(KERN_ERR "%s: mtu > %d bytes unsupported\n",
-				netdev->name, max_mtu);
-		return -EINVAL;
-	}
 
 	if (adapter->set_mtu)
 		rc = adapter->set_mtu(adapter, mtu);

drivers/net/ethernet/qlogic/netxen/netxen_nic_main.c

···
 			adapter->physical_port = i;
 	}
 
+	/* MTU range: 0 - 8000 (P2) or 9600 (P3) */
+	netdev->min_mtu = 0;
+	if (NX_IS_REVISION_P3(adapter->ahw.revision_id))
+		netdev->max_mtu = P3_MAX_MTU;
+	else
+		netdev->max_mtu = P2_MAX_MTU;
+
 	netxen_nic_clear_stats(adapter);
 
 	err = netxen_setup_intr(adapter);

drivers/net/ethernet/qlogic/qlge/qlge_main.c

···
 	ndev->ethtool_ops = &qlge_ethtool_ops;
 	ndev->watchdog_timeo = 10 * HZ;
 
+	/* MTU range: this driver only supports 1500 or 9000, so this only
+	 * filters out values above or below, and we'll rely on
+	 * qlge_change_mtu to make sure only 1500 or 9000 are allowed
+	 */
+	ndev->min_mtu = ETH_DATA_LEN;
+	ndev->max_mtu = 9000;
+
 	err = register_netdev(ndev);
 	if (err) {
 		dev_err(&pdev->dev, "net device registration failed.\n");

drivers/net/ethernet/qualcomm/emac/emac.c

···
 /* Change the Maximum Transfer Unit (MTU) */
 static int emac_change_mtu(struct net_device *netdev, int new_mtu)
 {
-	unsigned int max_frame = new_mtu + ETH_HLEN + ETH_FCS_LEN + VLAN_HLEN;
 	struct emac_adapter *adpt = netdev_priv(netdev);
-
-	if ((max_frame < EMAC_MIN_ETH_FRAME_SIZE) ||
-	    (max_frame > EMAC_MAX_ETH_FRAME_SIZE)) {
-		netdev_err(adpt->netdev, "error: invalid MTU setting\n");
-		return -EINVAL;
-	}
 
 	netif_info(adpt, hw, adpt->netdev,
 		   "changing MTU from %d to %d\n", netdev->mtu,
···
 
 	netdev->vlan_features |= NETIF_F_SG | NETIF_F_HW_CSUM |
 				 NETIF_F_TSO | NETIF_F_TSO6;
+
+	/* MTU range: 46 - 9194 */
+	netdev->min_mtu = EMAC_MIN_ETH_FRAME_SIZE -
+			  (ETH_HLEN + ETH_FCS_LEN + VLAN_HLEN);
+	netdev->max_mtu = EMAC_MAX_ETH_FRAME_SIZE -
+			  (ETH_HLEN + ETH_FCS_LEN + VLAN_HLEN);
 
 	INIT_WORK(&adpt->work_thread, emac_work_thread);
 

drivers/net/ethernet/xilinx/xilinx_axienet_main.c

···
 		XAE_TRL_SIZE) > lp->rxmem)
 		return -EINVAL;
 
-	if ((new_mtu > XAE_JUMBO_MTU) || (new_mtu < 64))
-		return -EINVAL;
-
 	ndev->mtu = new_mtu;
 
 	return 0;
···
 	ndev->features = NETIF_F_SG;
 	ndev->netdev_ops = &axienet_netdev_ops;
 	ndev->ethtool_ops = &axienet_ethtool_ops;
+
+	/* MTU range: 64 - 9000 */
+	ndev->min_mtu = 64;
+	ndev->max_mtu = XAE_JUMBO_MTU;
 
 	lp = netdev_priv(ndev);
 	lp->ndev = ndev;

drivers/net/fddi/skfp/skfddi.c

···
 	.ndo_stop		= skfp_close,
 	.ndo_start_xmit		= skfp_send_pkt,
 	.ndo_get_stats		= skfp_ctl_get_stats,
-	.ndo_change_mtu		= fddi_change_mtu,
 	.ndo_set_rx_mode	= skfp_ctl_set_multicast_list,
 	.ndo_set_mac_address	= skfp_ctl_set_mac_address,
 	.ndo_do_ioctl		= skfp_ioctl,

drivers/net/fjes/fjes_main.c

···
 	netdev->netdev_ops = &fjes_netdev_ops;
 	fjes_set_ethtool_ops(netdev);
 	netdev->mtu = fjes_support_mtu[3];
+	netdev->min_mtu = fjes_support_mtu[0];
+	netdev->max_mtu = fjes_support_mtu[3];
 	netdev->flags |= IFF_BROADCAST;
 	netdev->features |= NETIF_F_HW_CSUM | NETIF_F_HW_VLAN_CTAG_FILTER;
 }

drivers/net/geneve.c

···
 	return geneve_xmit_skb(skb, dev, info);
 }
 
-static int __geneve_change_mtu(struct net_device *dev, int new_mtu, bool strict)
+static int geneve_change_mtu(struct net_device *dev, int new_mtu)
 {
-	struct geneve_dev *geneve = netdev_priv(dev);
-	/* The max_mtu calculation does not take account of GENEVE
-	 * options, to avoid excluding potentially valid
-	 * configurations.
+	/* Only possible if called internally, ndo_change_mtu path's new_mtu
+	 * is guaranteed to be between dev->min_mtu and dev->max_mtu.
 	 */
-	int max_mtu = IP_MAX_MTU - GENEVE_BASE_HLEN - dev->hard_header_len;
-
-	if (geneve->remote.sa.sa_family == AF_INET6)
-		max_mtu -= sizeof(struct ipv6hdr);
-	else
-		max_mtu -= sizeof(struct iphdr);
-
-	if (new_mtu < 68)
-		return -EINVAL;
-
-	if (new_mtu > max_mtu) {
-		if (strict)
-			return -EINVAL;
-
-		new_mtu = max_mtu;
-	}
+	if (new_mtu > dev->max_mtu)
+		new_mtu = dev->max_mtu;
 
 	dev->mtu = new_mtu;
 	return 0;
-}
-
-static int geneve_change_mtu(struct net_device *dev, int new_mtu)
-{
-	return __geneve_change_mtu(dev, new_mtu, true);
 }
 
 static int geneve_fill_metadata_dst(struct net_device *dev, struct sk_buff *skb)
···
 
 	dev->hw_features |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_RXCSUM;
 	dev->hw_features |= NETIF_F_GSO_SOFTWARE;
+
+	/* MTU range: 68 - (something less than 65535) */
+	dev->min_mtu = ETH_MIN_MTU;
+	/* The max_mtu calculation does not take account of GENEVE
+	 * options, to avoid excluding potentially valid
+	 * configurations. This will be further reduced by IPvX hdr size.
+	 */
+	dev->max_mtu = IP_MAX_MTU - GENEVE_BASE_HLEN - dev->hard_header_len;
 
 	netif_keep_dst(dev);
 	dev->priv_flags &= ~IFF_TX_SKB_SHARING;
···
 
 	/* make enough headroom for basic scenario */
 	encap_len = GENEVE_BASE_HLEN + ETH_HLEN;
-	if (remote->sa.sa_family == AF_INET)
+	if (remote->sa.sa_family == AF_INET) {
 		encap_len += sizeof(struct iphdr);
-	else
+		dev->max_mtu -= sizeof(struct iphdr);
+	} else {
 		encap_len += sizeof(struct ipv6hdr);
+		dev->max_mtu -= sizeof(struct ipv6hdr);
+	}
 	dev->needed_headroom = encap_len + ETH_HLEN;
 
 	if (metadata) {
···
 	/* openvswitch users expect packet sizes to be unrestricted,
 	 * so set the largest MTU we can.
 	 */
-	err = __geneve_change_mtu(dev, IP_MAX_MTU, false);
+	err = geneve_change_mtu(dev, IP_MAX_MTU);
 	if (err)
 		goto err;
 

drivers/net/hippi/rrunner.c

···
 	.ndo_stop		= rr_close,
 	.ndo_do_ioctl		= rr_ioctl,
 	.ndo_start_xmit		= rr_start_xmit,
-	.ndo_change_mtu		= hippi_change_mtu,
 	.ndo_set_mac_address	= hippi_mac_addr,
 };
 

drivers/net/hyperv/hyperv_net.h

···
 } __packed;
 
 
-#define NETVSC_MTU 65536
-#define NETVSC_MTU_MIN 68
+#define NETVSC_MTU 65535
+#define NETVSC_MTU_MIN ETH_MIN_MTU
 
 #define NETVSC_RECEIVE_BUFFER_SIZE		(1024*1024*16)	/* 16MB */
 #define NETVSC_RECEIVE_BUFFER_SIZE_LEGACY	(1024*1024*15)  /* 15MB */

drivers/net/hyperv/netvsc_drv.c

···
 	struct netvsc_device *nvdev = ndevctx->nvdev;
 	struct hv_device *hdev = ndevctx->device_ctx;
 	struct netvsc_device_info device_info;
-	int limit = ETH_DATA_LEN;
 	u32 num_chn;
 	int ret = 0;
 
 	if (ndevctx->start_remove || !nvdev || nvdev->destroy)
 		return -ENODEV;
-
-	if (nvdev->nvsp_version >= NVSP_PROTOCOL_VERSION_2)
-		limit = NETVSC_MTU - ETH_HLEN;
-
-	if (mtu < NETVSC_MTU_MIN || mtu > limit)
-		return -EINVAL;
 
 	ret = netvsc_close(ndev);
 	if (ret)
···
 	nvdev = net_device_ctx->nvdev;
 	netif_set_real_num_tx_queues(net, nvdev->num_chn);
 	netif_set_real_num_rx_queues(net, nvdev->num_chn);
+
+	/* MTU range: 68 - 1500 or 65521 */
+	net->min_mtu = NETVSC_MTU_MIN;
+	if (nvdev->nvsp_version >= NVSP_PROTOCOL_VERSION_2)
+		net->max_mtu = NETVSC_MTU - ETH_HLEN;
+	else
+		net->max_mtu = ETH_DATA_LEN;
 
 	ret = register_netdev(net);
 	if (ret != 0) {

drivers/net/macsec.c

···
 static void macsec_setup(struct net_device *dev)
 {
 	ether_setup(dev);
+	dev->min_mtu = 0;
+	dev->max_mtu = ETH_MAX_MTU;
 	dev->priv_flags |= IFF_NO_QUEUE;
 	dev->netdev_ops = &macsec_netdev_ops;
 	dev->destructor = macsec_free_netdev;

drivers/net/macvlan.c

···
 {
 	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;
···
 {
 	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;
···
 		dev->mtu = lowerdev->mtu;
 	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);

drivers/net/ntb_netdev.c

···
 	ndev->netdev_ops = &ntb_netdev_ops;
 	ndev->ethtool_ops = &ntb_ethtool_ops;
 
+	ndev->min_mtu = 0;
+	ndev->max_mtu = ETH_MAX_MTU;
+
 	dev->qp = ntb_transport_create_queue(ndev, client_dev,
 					     &ntb_netdev_handlers);
 	if (!dev->qp) {

drivers/net/rionet.c

···
 	rnet->msg_enable = value;
 }
 
-static int rionet_change_mtu(struct net_device *ndev, int new_mtu)
-{
-	if ((new_mtu < 68) || (new_mtu > RIONET_MAX_MTU)) {
-		printk(KERN_ERR "%s: Invalid MTU size %d\n",
-		       ndev->name, new_mtu);
-		return -EINVAL;
-	}
-	ndev->mtu = new_mtu;
-	return 0;
-}
-
 static const struct ethtool_ops rionet_ethtool_ops = {
 	.get_drvinfo = rionet_get_drvinfo,
 	.get_msglevel = rionet_get_msglevel,
···
 	.ndo_open		= rionet_open,
 	.ndo_stop		= rionet_close,
 	.ndo_start_xmit		= rionet_start_xmit,
-	.ndo_change_mtu		= rionet_change_mtu,
 	.ndo_validate_addr	= eth_validate_addr,
 	.ndo_set_mac_address	= eth_mac_addr,
 };
···
 
 	ndev->netdev_ops = &rionet_netdev_ops;
 	ndev->mtu = RIONET_MAX_MTU;
+	/* MTU range: 68 - 4082 */
+	ndev->min_mtu = ETH_MIN_MTU;
+	ndev->max_mtu = RIONET_MAX_MTU;
 	ndev->features = NETIF_F_LLTX;
 	SET_NETDEV_DEV(ndev, &mport->dev);
 	ndev->ethtool_ops = &rionet_ethtool_ops;

drivers/net/slip/slip.c

···
 {
 	struct slip *sl = netdev_priv(dev);
 
-	if (new_mtu < 68 || new_mtu > 65534)
-		return -EINVAL;
-
-	if (new_mtu != dev->mtu)
-		return sl_realloc_bufs(sl, new_mtu);
-	return 0;
+	return sl_realloc_bufs(sl, new_mtu);
 }
 
 /* Netdevice get statistics request */
···
 	dev->hard_header_len	= 0;
 	dev->addr_len		= 0;
 	dev->tx_queue_len	= 10;
+
+	/* MTU range: 68 - 65534 */
+	dev->min_mtu = 68;
+	dev->max_mtu = 65534;
 
 	/* New-style flags. */
 	dev->flags		= IFF_NOARP|IFF_POINTOPOINT|IFF_MULTICAST;

drivers/net/tun.c

···
 	 */
 }
 
-#define MIN_MTU 68
-#define MAX_MTU 65535
-
-static int
-tun_net_change_mtu(struct net_device *dev, int new_mtu)
-{
-	if (new_mtu < MIN_MTU || new_mtu + dev->hard_header_len > MAX_MTU)
-		return -EINVAL;
-	dev->mtu = new_mtu;
-	return 0;
-}
-
 static netdev_features_t tun_net_fix_features(struct net_device *dev,
 	netdev_features_t features)
 {
···
 	.ndo_open		= tun_net_open,
 	.ndo_stop		= tun_net_close,
 	.ndo_start_xmit		= tun_net_xmit,
-	.ndo_change_mtu		= tun_net_change_mtu,
 	.ndo_fix_features	= tun_net_fix_features,
 	.ndo_select_queue	= tun_select_queue,
 #ifdef CONFIG_NET_POLL_CONTROLLER
···
 	.ndo_open		= tun_net_open,
 	.ndo_stop		= tun_net_close,
 	.ndo_start_xmit		= tun_net_xmit,
-	.ndo_change_mtu		= tun_net_change_mtu,
 	.ndo_fix_features	= tun_net_fix_features,
 	.ndo_set_rx_mode	= tun_net_mclist,
 	.ndo_set_mac_address	= eth_mac_addr,
···
 	tun_flow_flush(tun);
 }
 
+#define MIN_MTU 68
+#define MAX_MTU 65535
+
 /* Initialize net device. */
 static void tun_net_init(struct net_device *dev)
 {
···
 
 		break;
 	}
+
+	dev->min_mtu = MIN_MTU;
+	dev->max_mtu = MAX_MTU - dev->hard_header_len;
 }
 
 /* Character device part */

drivers/net/usb/asix_devices.c

···
 
 	netdev_dbg(dev->net, "ax88178_change_mtu() new_mtu=%d\n", new_mtu);
 
-	if (new_mtu <= 0 || ll_mtu > 16384)
-		return -EINVAL;
-
 	if ((ll_mtu % dev->maxpacket) == 0)
 		return -EDOM;
 
···
 
 	dev->net->netdev_ops = &ax88178_netdev_ops;
 	dev->net->ethtool_ops = &ax88178_ethtool_ops;
+	dev->net->max_mtu = 16384 - (dev->net->hard_header_len + 4);
 
 	/* Blink LEDS so users know driver saw dongle */
 	asix_sw_reset(dev, 0, 0);

drivers/net/usb/ax88179_178a.c

···
 	struct usbnet *dev = netdev_priv(net);
 	u16 tmp16;
 
-	if (new_mtu <= 0 || new_mtu > 4088)
-		return -EINVAL;
-
 	net->mtu = new_mtu;
 	dev->hard_mtu = net->mtu + net->hard_header_len;
 
···
 	dev->net->netdev_ops = &ax88179_netdev_ops;
 	dev->net->ethtool_ops = &ax88179_ethtool_ops;
 	dev->net->needed_headroom = 8;
+	dev->net->max_mtu = 4088;
 
 	/* Initialize MII structure */
 	dev->mii.dev = dev->net;

drivers/net/usb/cdc-phonet.c

···
 	return -ENOIOCTLCMD;
 }
 
-static int usbpn_set_mtu(struct net_device *dev, int new_mtu)
-{
-	if ((new_mtu < PHONET_MIN_MTU) || (new_mtu > PHONET_MAX_MTU))
-		return -EINVAL;
-
-	dev->mtu = new_mtu;
-	return 0;
-}
-
 static const struct net_device_ops usbpn_ops = {
 	.ndo_open	= usbpn_open,
 	.ndo_stop	= usbpn_close,
 	.ndo_start_xmit = usbpn_xmit,
 	.ndo_do_ioctl	= usbpn_ioctl,
-	.ndo_change_mtu = usbpn_set_mtu,
 };
 
 static void usbpn_setup(struct net_device *dev)
···
 	dev->type		= ARPHRD_PHONET;
 	dev->flags		= IFF_POINTOPOINT | IFF_NOARP;
 	dev->mtu		= PHONET_MAX_MTU;
+	dev->min_mtu		= PHONET_MIN_MTU;
+	dev->max_mtu		= PHONET_MAX_MTU;
 	dev->hard_header_len	= 1;
 	dev->dev_addr[0]	= PN_MEDIA_USB;
 	dev->addr_len		= 1;

drivers/net/usb/cdc_ncm.c

···
 int cdc_ncm_change_mtu(struct net_device *net, int new_mtu)
 {
 	struct usbnet *dev = netdev_priv(net);
-	int maxmtu = cdc_ncm_max_dgram_size(dev) - cdc_ncm_eth_hlen(dev);
-
-	if (new_mtu <= 0 || new_mtu > maxmtu)
-		return -EINVAL;
 
 	net->mtu = new_mtu;
 	cdc_ncm_set_dgram_size(dev, new_mtu + cdc_ncm_eth_hlen(dev));
···
 
 	/* must handle MTU changes */
 	dev->net->netdev_ops = &cdc_ncm_netdev_ops;
+	dev->net->max_mtu = cdc_ncm_max_dgram_size(dev) - cdc_ncm_eth_hlen(dev);
 
 	return 0;
 

drivers/net/usb/lan78xx.c

···
 	int old_rx_urb_size = dev->rx_urb_size;
 	int ret;
 
-	if (new_mtu > MAX_SINGLE_PACKET_SIZE)
-		return -EINVAL;
-
-	if (new_mtu <= 0)
-		return -EINVAL;
 	/* no second zero-length packet read wanted after mtu-sized packets */
 	if ((ll_mtu % dev->maxpacket) == 0)
 		return -EDOM;
···
 
 	if (netdev->mtu > (dev->hard_mtu - netdev->hard_header_len))
 		netdev->mtu = dev->hard_mtu - netdev->hard_header_len;
+
+	/* MTU range: 68 - 9000 */
+	netdev->max_mtu = MAX_SINGLE_PACKET_SIZE;
 
 	dev->ep_blkin = (intf->cur_altsetting)->endpoint + 0;
 	dev->ep_blkout = (intf->cur_altsetting)->endpoint + 1;

drivers/net/usb/r8152.c

···
 		break;
 	}
 
-	if (new_mtu < 68 || new_mtu > RTL8153_MAX_MTU)
-		return -EINVAL;
-
 	ret = usb_autopm_get_interface(tp->intf);
 	if (ret < 0)
 		return ret;
···
 
 	netdev->ethtool_ops = &ops;
 	netif_set_gso_max_size(netdev, RTL_LIMITED_TSO_SIZE);
+
+	/* MTU range: 68 - 1500 or 9194 */
+	netdev->min_mtu = ETH_MIN_MTU;
+	switch (tp->version) {
+	case RTL_VER_01:
+	case RTL_VER_02:
+		netdev->max_mtu = ETH_DATA_LEN;
+		break;
+	default:
+		netdev->max_mtu = RTL8153_MAX_MTU;
+		break;
+	}
 
 	tp->mii.dev = netdev;
 	tp->mii.mdio_read = read_mii_word;

drivers/net/usb/sierra_net.c

···
 
 /* Forward definitions */
 static void sierra_sync_timer(unsigned long syncdata);
-static int sierra_net_change_mtu(struct net_device *net, int new_mtu);
 
 /* Our own net device operations structure */
 static const struct net_device_ops sierra_net_device_ops = {
···
 	.ndo_stop               = usbnet_stop,
 	.ndo_start_xmit         = usbnet_start_xmit,
 	.ndo_tx_timeout         = usbnet_tx_timeout,
-	.ndo_change_mtu         = sierra_net_change_mtu,
+	.ndo_change_mtu         = usbnet_change_mtu,
 	.ndo_set_mac_address    = eth_mac_addr,
 	.ndo_validate_addr      = eth_validate_addr,
 };
···
 	.nway_reset = usbnet_nway_reset,
 };
 
-/* MTU can not be more than 1500 bytes, enforce it. */
-static int sierra_net_change_mtu(struct net_device *net, int new_mtu)
-{
-	if (new_mtu > SIERRA_NET_MAX_SUPPORTED_MTU)
-		return -EINVAL;
-
-	return usbnet_change_mtu(net, new_mtu);
-}
-
 static int sierra_net_get_fw_attr(struct usbnet *dev, u16 *datap)
 {
 	int result = 0;
···
 
 	dev->net->hard_header_len += SIERRA_NET_HIP_EXT_HDR_LEN;
 	dev->hard_mtu = dev->net->mtu + dev->net->hard_header_len;
+	dev->net->max_mtu = SIERRA_NET_MAX_SUPPORTED_MTU;
 
 	/* Set up the netdev */
 	dev->net->flags |= IFF_NOARP;

drivers/net/usb/smsc75xx.c

···
 	struct usbnet *dev = netdev_priv(netdev);
 	int ret;
 
-	if (new_mtu > MAX_SINGLE_PACKET_SIZE)
-		return -EINVAL;
-
 	ret = smsc75xx_set_rx_max_frame_length(dev, new_mtu + ETH_HLEN);
 	if (ret < 0) {
 		netdev_warn(dev->net, "Failed to set mac rx frame length\n");
···
 	dev->net->flags |= IFF_MULTICAST;
 	dev->net->hard_header_len += SMSC75XX_TX_OVERHEAD;
 	dev->hard_mtu = dev->net->mtu + dev->net->hard_header_len;
+	dev->net->max_mtu = MAX_SINGLE_PACKET_SIZE;
 	return 0;
 }
 

drivers/net/usb/usbnet.c

···
 	int		old_hard_mtu = dev->hard_mtu;
 	int		old_rx_urb_size = dev->rx_urb_size;
 
-	if (new_mtu <= 0)
-		return -EINVAL;
 	// no second zero-length packet read wanted after mtu-sized packets
 	if ((ll_mtu % dev->maxpacket) == 0)
 		return -EDOM;
···
 	 * bind() should set rx_urb_size in that case.
 	 */
 	dev->hard_mtu = net->mtu + net->hard_header_len;
+	net->min_mtu = 0;
+	net->max_mtu = ETH_MAX_MTU;
 
 	net->netdev_ops = &usbnet_netdev_ops;
 	net->watchdog_timeo = TX_TIMEOUT_JIFFIES;

drivers/net/veth.c

···
 #define DRV_NAME	"veth"
 #define DRV_VERSION	"1.0"
 
-#define MIN_MTU 68		/* Min L3 MTU */
-#define MAX_MTU 65535		/* Max L3 MTU (arbitrary) */
-
 struct pcpu_vstats {
 	u64			packets;
 	u64			bytes;
···
 	return 0;
 }
 
-static int is_valid_veth_mtu(int new_mtu)
+static int is_valid_veth_mtu(int mtu)
 {
-	return new_mtu >= MIN_MTU && new_mtu <= MAX_MTU;
-}
-
-static int veth_change_mtu(struct net_device *dev, int new_mtu)
-{
-	if (!is_valid_veth_mtu(new_mtu))
-		return -EINVAL;
-	dev->mtu = new_mtu;
-	return 0;
+	return mtu >= ETH_MIN_MTU && mtu <= ETH_MAX_MTU;
 }
 
 static int veth_dev_init(struct net_device *dev)
···
 	.ndo_open            = veth_open,
 	.ndo_stop            = veth_close,
 	.ndo_start_xmit      = veth_xmit,
-	.ndo_change_mtu      = veth_change_mtu,
 	.ndo_get_stats64     = veth_get_stats64,
 	.ndo_set_rx_mode     = veth_set_multicast_list,
 	.ndo_set_mac_address = eth_mac_addr,
···
 			       NETIF_F_HW_VLAN_CTAG_RX |
 			       NETIF_F_HW_VLAN_STAG_RX);
 	dev->destructor = veth_dev_free;
+	dev->max_mtu = ETH_MAX_MTU;
 
 	dev->hw_features = VETH_FEATURES;
 	dev->hw_enc_features = VETH_FEATURES;

drivers/net/virtio_net.c

···
 	.set_settings = virtnet_set_settings,
 };
 
-#define MIN_MTU 68
-#define MAX_MTU 65535
-
-static int virtnet_change_mtu(struct net_device *dev, int new_mtu)
-{
-	if (new_mtu < MIN_MTU || new_mtu > MAX_MTU)
-		return -EINVAL;
-	dev->mtu = new_mtu;
-	return 0;
-}
-
 static const struct net_device_ops virtnet_netdev = {
 	.ndo_open            = virtnet_open,
 	.ndo_stop   	     = virtnet_close,
···
 	.ndo_validate_addr   = eth_validate_addr,
 	.ndo_set_mac_address = virtnet_set_mac_address,
 	.ndo_set_rx_mode     = virtnet_set_rx_mode,
-	.ndo_change_mtu	     = virtnet_change_mtu,
 	.ndo_get_stats64     = virtnet_stats,
 	.ndo_vlan_rx_add_vid = virtnet_vlan_rx_add_vid,
 	.ndo_vlan_rx_kill_vid = virtnet_vlan_rx_kill_vid,
···
 	return true;
 }
 
+#define MIN_MTU ETH_MIN_MTU
+#define MAX_MTU ETH_MAX_MTU
+
 static int virtnet_probe(struct virtio_device *vdev)
 {
 	int i, err;
···
 
 	dev->vlan_features = dev->features;
 
+	/* MTU range: 68 - 65535 */
+	dev->min_mtu = MIN_MTU;
+	dev->max_mtu = MAX_MTU;
+
 	/* Configuration may specify what MAC to use.  Otherwise random. */
 	if (virtio_has_feature(vdev, VIRTIO_NET_F_MAC))
 		virtio_cread_bytes(vdev,
···
 		mtu = virtio_cread16(vdev,
 				     offsetof(struct virtio_net_config,
 					      mtu));
-		if (virtnet_change_mtu(dev, mtu))
+		if (mtu < dev->min_mtu || mtu > dev->max_mtu)
 			__virtio_clear_bit(vdev, VIRTIO_NET_F_MTU);
+		else
+			dev->mtu = mtu;
 	}
 
 	if (vi->any_header_sg)

drivers/net/vmxnet3/vmxnet3_drv.c

···
 	struct vmxnet3_adapter *adapter = netdev_priv(netdev);
 	int err = 0;
 
-	if (new_mtu < VMXNET3_MIN_MTU || new_mtu > VMXNET3_MAX_MTU)
-		return -EINVAL;
-
 	netdev->mtu = new_mtu;
 
 	/*
···
 	netdev->netdev_ops = &vmxnet3_netdev_ops;
 	vmxnet3_set_ethtool_ops(netdev);
 	netdev->watchdog_timeo = 5 * HZ;
+
+	/* MTU range: 60 - 9000 */
+	netdev->min_mtu = VMXNET3_MIN_MTU;
+	netdev->max_mtu = VMXNET3_MAX_MTU;
 
 	INIT_WORK(&adapter->work, vmxnet3_reset_work);
 	set_bit(VMXNET3_STATE_BIT_QUIESCED, &adapter->state);

drivers/net/vxlan.c

···
 {
 }
 
-static int __vxlan_change_mtu(struct net_device *dev,
-			      struct net_device *lowerdev,
-			      struct vxlan_rdst *dst, int new_mtu, bool strict)
-{
-	int max_mtu = IP_MAX_MTU;
-
-	if (lowerdev)
-		max_mtu = lowerdev->mtu;
-
-	if (dst->remote_ip.sa.sa_family == AF_INET6)
-		max_mtu -= VXLAN6_HEADROOM;
-	else
-		max_mtu -= VXLAN_HEADROOM;
-
-	if (new_mtu < 68)
-		return -EINVAL;
-
-	if (new_mtu > max_mtu) {
-		if (strict)
-			return -EINVAL;
-
-		new_mtu = max_mtu;
-	}
-
-	dev->mtu = new_mtu;
-	return 0;
-}
-
 static int vxlan_change_mtu(struct net_device *dev, int new_mtu)
 {
 	struct vxlan_dev *vxlan = netdev_priv(dev);
 	struct vxlan_rdst *dst = &vxlan->default_dst;
 	struct net_device *lowerdev = __dev_get_by_index(vxlan->net,
 							 dst->remote_ifindex);
-	return __vxlan_change_mtu(dev, lowerdev, dst, new_mtu, true);
+	bool use_ipv6 = false;
+
+	if (dst->remote_ip.sa.sa_family == AF_INET6)
+		use_ipv6 = true;
+
+	/* This check is different than dev->max_mtu, because it looks at
+	 * the lowerdev->mtu, rather than the static dev->max_mtu
+	 */
+	if (lowerdev) {
+		int max_mtu = lowerdev->mtu -
+			      (use_ipv6 ? VXLAN6_HEADROOM : VXLAN_HEADROOM);
+		if (new_mtu > max_mtu)
+			return -EINVAL;
+	}
+
+	dev->mtu = new_mtu;
+	return 0;
 }
 
 static int vxlan_fill_metadata_dst(struct net_device *dev, struct sk_buff *skb)
···
 		vxlan_ether_setup(dev);
 	}
 
+	/* MTU range: 68 - 65535 */
+	dev->min_mtu = ETH_MIN_MTU;
+	dev->max_mtu = ETH_MAX_MTU;
+
 	vxlan->net = src_net;
 
 	dst->remote_vni = conf->vni;
···
 #endif
 
 		if (!conf->mtu)
-			dev->mtu = lowerdev->mtu - (use_ipv6 ? VXLAN6_HEADROOM : VXLAN_HEADROOM);
+			dev->mtu = lowerdev->mtu -
+				   (use_ipv6 ? VXLAN6_HEADROOM : VXLAN_HEADROOM);
 
 		needed_headroom = lowerdev->hard_header_len;
 	} else if (vxlan_addr_multicast(&dst->remote_ip)) {
···
 	}
 
 	if (conf->mtu) {
-		err = __vxlan_change_mtu(dev, lowerdev, dst, conf->mtu, false);
-		if (err)
-			return err;
+		int max_mtu = ETH_MAX_MTU;
+
+		if (lowerdev)
+			max_mtu = lowerdev->mtu;
+
+		max_mtu -= (use_ipv6 ? VXLAN6_HEADROOM : VXLAN_HEADROOM);
+
+		if (conf->mtu < dev->min_mtu || conf->mtu > dev->max_mtu)
+			return -EINVAL;
+
+		dev->mtu = conf->mtu;
+
+		if (conf->mtu > max_mtu)
+			dev->mtu = max_mtu;
 	}
 
 	if (use_ipv6 || conf->flags & VXLAN_F_COLLECT_METADATA)

drivers/net/wan/c101.c

···
 static const struct net_device_ops c101_ops = {
 	.ndo_open       = c101_open,
 	.ndo_stop       = c101_close,
-	.ndo_change_mtu = hdlc_change_mtu,
 	.ndo_start_xmit = hdlc_start_xmit,
 	.ndo_do_ioctl   = c101_ioctl,
 };

drivers/net/wan/cosa.c

···
 static const struct net_device_ops cosa_ops = {
 	.ndo_open       = cosa_net_open,
 	.ndo_stop       = cosa_net_close,
-	.ndo_change_mtu = hdlc_change_mtu,
 	.ndo_start_xmit = hdlc_start_xmit,
 	.ndo_do_ioctl   = cosa_net_ioctl,
 	.ndo_tx_timeout = cosa_net_timeout,

drivers/net/wan/dscc4.c

···
 static const struct net_device_ops dscc4_ops = {
 	.ndo_open       = dscc4_open,
 	.ndo_stop       = dscc4_close,
-	.ndo_change_mtu = hdlc_change_mtu,
 	.ndo_start_xmit = hdlc_start_xmit,
 	.ndo_do_ioctl   = dscc4_ioctl,
 	.ndo_tx_timeout = dscc4_tx_timeout,

drivers/net/wan/farsync.c

···
 static const struct net_device_ops fst_ops = {
 	.ndo_open       = fst_open,
 	.ndo_stop       = fst_close,
-	.ndo_change_mtu = hdlc_change_mtu,
 	.ndo_start_xmit = hdlc_start_xmit,
 	.ndo_do_ioctl   = fst_ioctl,
 	.ndo_tx_timeout = fst_tx_timeout,

drivers/net/wan/fsl_ucc_hdlc.c

···
 static const struct net_device_ops uhdlc_ops = {
 	.ndo_open       = uhdlc_open,
 	.ndo_stop       = uhdlc_close,
-	.ndo_change_mtu = hdlc_change_mtu,
 	.ndo_start_xmit = hdlc_start_xmit,
 	.ndo_do_ioctl   = uhdlc_ioctl,
 };

drivers/net/wan/hdlc.c

···
 
 static struct hdlc_proto *first_proto;
 
-int hdlc_change_mtu(struct net_device *dev, int new_mtu)
-{
-	if ((new_mtu < 68) || (new_mtu > HDLC_MAX_MTU))
-		return -EINVAL;
-	dev->mtu = new_mtu;
-	return 0;
-}
-
 static int hdlc_rcv(struct sk_buff *skb, struct net_device *dev,
 		    struct packet_type *p, struct net_device *orig_dev)
 {
···
 	dev->flags		 = IFF_POINTOPOINT | IFF_NOARP;
 	dev->priv_flags		 = IFF_WAN_HDLC;
 	dev->mtu		 = HDLC_MAX_MTU;
+	dev->min_mtu		 = 68;
+	dev->max_mtu		 = HDLC_MAX_MTU;
 	dev->type		 = ARPHRD_RAWHDLC;
 	dev->hard_header_len	 = 16;
 	dev->addr_len		 = 0;
···
 MODULE_DESCRIPTION("HDLC support module");
 MODULE_LICENSE("GPL v2");
 
-EXPORT_SYMBOL(hdlc_change_mtu);
 EXPORT_SYMBOL(hdlc_start_xmit);
 EXPORT_SYMBOL(hdlc_open);
 EXPORT_SYMBOL(hdlc_close);

drivers/net/wan/hdlc_fr.c

···
 static const struct net_device_ops pvc_ops = {
 	.ndo_open       = pvc_open,
 	.ndo_stop       = pvc_close,
-	.ndo_change_mtu = hdlc_change_mtu,
 	.ndo_start_xmit = pvc_xmit,
 	.ndo_do_ioctl   = pvc_ioctl,
 };
···
 	}
 	dev->netdev_ops = &pvc_ops;
 	dev->mtu = HDLC_MAX_MTU;
+	dev->min_mtu = 68;
+	dev->max_mtu = HDLC_MAX_MTU;
 	dev->priv_flags |= IFF_NO_QUEUE;
 	dev->ml_priv = pvc;
 

drivers/net/wan/hostess_sv11.c

···
 static const struct net_device_ops hostess_ops = {
 	.ndo_open       = hostess_open,
 	.ndo_stop       = hostess_close,
-	.ndo_change_mtu = hdlc_change_mtu,
 	.ndo_start_xmit = hdlc_start_xmit,
 	.ndo_do_ioctl   = hostess_ioctl,
 };

drivers/net/wan/ixp4xx_hss.c

···
 static const struct net_device_ops hss_hdlc_ops = {
 	.ndo_open       = hss_hdlc_open,
 	.ndo_stop       = hss_hdlc_close,
-	.ndo_change_mtu = hdlc_change_mtu,
 	.ndo_start_xmit = hdlc_start_xmit,
 	.ndo_do_ioctl   = hss_hdlc_ioctl,
 };

drivers/net/wan/lmc/lmc_main.c

···
 static const struct net_device_ops lmc_ops = {
 	.ndo_open       = lmc_open,
 	.ndo_stop       = lmc_close,
-	.ndo_change_mtu = hdlc_change_mtu,
 	.ndo_start_xmit = hdlc_start_xmit,
 	.ndo_do_ioctl   = lmc_ioctl,
 	.ndo_tx_timeout = lmc_driver_timeout,

drivers/net/wan/n2.c

···
 static const struct net_device_ops n2_ops = {
 	.ndo_open       = n2_open,
 	.ndo_stop       = n2_close,
-	.ndo_change_mtu = hdlc_change_mtu,
 	.ndo_start_xmit = hdlc_start_xmit,
 	.ndo_do_ioctl   = n2_ioctl,
 };

drivers/net/wan/pc300too.c

···
 static const struct net_device_ops pc300_ops = {
 	.ndo_open       = pc300_open,
 	.ndo_stop       = pc300_close,
-	.ndo_change_mtu = hdlc_change_mtu,
 	.ndo_start_xmit = hdlc_start_xmit,
 	.ndo_do_ioctl   = pc300_ioctl,
 };

drivers/net/wan/pci200syn.c

···
 static const struct net_device_ops pci200_ops = {
 	.ndo_open       = pci200_open,
 	.ndo_stop       = pci200_close,
-	.ndo_change_mtu = hdlc_change_mtu,
 	.ndo_start_xmit = hdlc_start_xmit,
 	.ndo_do_ioctl   = pci200_ioctl,
 };

drivers/net/wan/sealevel.c

···
 static const struct net_device_ops sealevel_ops = {
 	.ndo_open       = sealevel_open,
 	.ndo_stop       = sealevel_close,
-	.ndo_change_mtu = hdlc_change_mtu,
 	.ndo_start_xmit = hdlc_start_xmit,
 	.ndo_do_ioctl   = sealevel_ioctl,
 };

drivers/net/wan/wanxl.c

···
 static const struct net_device_ops wanxl_ops = {
 	.ndo_open       = wanxl_open,
 	.ndo_stop       = wanxl_close,
-	.ndo_change_mtu = hdlc_change_mtu,
 	.ndo_start_xmit = hdlc_start_xmit,
 	.ndo_do_ioctl   = wanxl_ioctl,
 	.ndo_get_stats  = wanxl_get_stats,

drivers/net/wan/x25_asy.c

···
 	unsigned char *xbuff, *rbuff;
 	int len;
 
-	if (newmtu > 65534)
-		return -EINVAL;
-
 	len = 2 * newmtu;
 	xbuff = kmalloc(len + 4, GFP_ATOMIC);
 	rbuff = kmalloc(len + 4, GFP_ATOMIC);
···
 	 */
 
 	dev->mtu		= SL_MTU;
+	dev->min_mtu		= 0;
+	dev->max_mtu		= 65534;
 	dev->netdev_ops		= &x25_asy_netdev_ops;
 	dev->watchdog_timeo	= HZ*20;
 	dev->hard_header_len	= 0;

drivers/net/wimax/i2400m/netdev.c

···
 
 
 static
-int i2400m_change_mtu(struct net_device *net_dev, int new_mtu)
-{
-	int result;
-	struct i2400m *i2400m = net_dev_to_i2400m(net_dev);
-	struct device *dev = i2400m_dev(i2400m);
-
-	if (new_mtu >= I2400M_MAX_MTU) {
-		dev_err(dev, "Cannot change MTU to %d (max is %d)\n",
-			new_mtu, I2400M_MAX_MTU);
-		result = -EINVAL;
-	} else {
-		net_dev->mtu = new_mtu;
-		result = 0;
-	}
-	return result;
-}
-
-
-static
 void i2400m_tx_timeout(struct net_device *net_dev)
 {
 	/*
···
 	.ndo_stop = i2400m_stop,
 	.ndo_start_xmit = i2400m_hard_start_xmit,
 	.ndo_tx_timeout = i2400m_tx_timeout,
-	.ndo_change_mtu = i2400m_change_mtu,
 };
 
 static void i2400m_get_drvinfo(struct net_device *net_dev,
···
 	d_fnstart(3, NULL, "(net_dev %p)\n", net_dev);
 	ether_setup(net_dev);
 	net_dev->mtu = I2400M_MAX_MTU;
+	net_dev->min_mtu = 0;
+	net_dev->max_mtu = I2400M_MAX_MTU;
 	net_dev->tx_queue_len = I2400M_TX_QLEN;
 	net_dev->features =
 		  NETIF_F_VLAN_CHALLENGED

drivers/net/wireless/ath/wil6210/netdev.c

···
 	return wil_down(wil);
 }
 
-static int wil_change_mtu(struct net_device *ndev, int new_mtu)
-{
-	struct wil6210_priv *wil = ndev_to_wil(ndev);
-
-	if (new_mtu < 68 || new_mtu > mtu_max) {
-		wil_err(wil, "invalid MTU %d\n", new_mtu);
-		return -EINVAL;
-	}
-
-	wil_dbg_misc(wil, "change MTU %d -> %d\n", ndev->mtu, new_mtu);
-	ndev->mtu = new_mtu;
-
-	return 0;
-}
-
 static int wil_do_ioctl(struct net_device *ndev, struct ifreq *ifr, int cmd)
 {
 	struct wil6210_priv *wil = ndev_to_wil(ndev);
···
 	.ndo_start_xmit		= wil_start_xmit,
 	.ndo_set_mac_address	= eth_mac_addr,
 	.ndo_validate_addr	= eth_validate_addr,
-	.ndo_change_mtu		= wil_change_mtu,
 	.ndo_do_ioctl		= wil_do_ioctl,
 };
 
···
 static void wil_dev_setup(struct net_device *dev)
 {
 	ether_setup(dev);
+	dev->max_mtu = mtu_max;
 	dev->tx_queue_len = WIL_TX_Q_LEN_DEFAULT;
 }
 

drivers/net/wireless/atmel/atmel.c

···
 	return &priv->wstats;
 }
 
-static int atmel_change_mtu(struct net_device *dev, int new_mtu)
-{
-	if ((new_mtu < 68) || (new_mtu > 2312))
-		return -EINVAL;
-	dev->mtu = new_mtu;
-	return 0;
-}
-
 static int atmel_set_mac_address(struct net_device *dev, void *p)
 {
 	struct sockaddr *addr = p;
···
 static const struct net_device_ops atmel_netdev_ops = {
 	.ndo_open 		= atmel_open,
 	.ndo_stop		= atmel_close,
-	.ndo_change_mtu 	= atmel_change_mtu,
 	.ndo_set_mac_address 	= atmel_set_mac_address,
 	.ndo_start_xmit 	= start_tx,
 	.ndo_do_ioctl 		= atmel_ioctl,
···
 	dev->wireless_handlers = &atmel_handler_def;
 	dev->irq = irq;
 	dev->base_addr = port;
+
+	/* MTU range: 68 - 2312 */
+	dev->min_mtu = 68;
+	dev->max_mtu = MAX_WIRELESS_BODY - ETH_FCS_LEN;
 
 	SET_NETDEV_DEV(dev, sys_dev);
 

drivers/net/wireless/cisco/airo.c

···
 	return 0;
 }
 
-static int airo_change_mtu(struct net_device *dev, int new_mtu)
-{
-	if ((new_mtu < 68) || (new_mtu > 2400))
-		return -EINVAL;
-	dev->mtu = new_mtu;
-	return 0;
-}
-
 static LIST_HEAD(airo_devices);
 
 static void add_airo_dev(struct airo_info *ai)
···
 	.ndo_get_stats 		= airo_get_stats,
 	.ndo_set_mac_address	= airo_set_mac_address,
 	.ndo_do_ioctl		= airo_ioctl,
-	.ndo_change_mtu		= airo_change_mtu,
 };
 
 static void wifi_setup(struct net_device *dev)
···
 	dev->type               = ARPHRD_IEEE80211;
 	dev->hard_header_len    = ETH_HLEN;
 	dev->mtu                = AIRO_DEF_MTU;
+	dev->min_mtu            = 68;
+	dev->max_mtu            = MIC_MSGLEN_MAX;
 	dev->addr_len           = ETH_ALEN;
 	dev->tx_queue_len       = 100; 
 
···
 	.ndo_set_rx_mode	= airo_set_multicast_list,
 	.ndo_set_mac_address	= airo_set_mac_address,
 	.ndo_do_ioctl		= airo_ioctl,
-	.ndo_change_mtu		= airo_change_mtu,
 	.ndo_validate_addr	= eth_validate_addr,
 };
 
···
 	.ndo_set_rx_mode	= airo_set_multicast_list,
 	.ndo_set_mac_address	= airo_set_mac_address,
 	.ndo_do_ioctl		= airo_ioctl,
-	.ndo_change_mtu		= airo_change_mtu,
 	.ndo_validate_addr	= eth_validate_addr,
 };
 
···
 	dev->irq = irq;
 	dev->base_addr = port;
 	dev->priv_flags &= ~IFF_TX_SKB_SHARING;
+	dev->max_mtu = MIC_MSGLEN_MAX;
 
 	SET_NETDEV_DEV(dev, dmdev);
 

drivers/net/wireless/intel/ipw2x00/ipw2100.c

···
 	.ndo_open		= ipw2100_open,
 	.ndo_stop		= ipw2100_close,
 	.ndo_start_xmit		= libipw_xmit,
-	.ndo_change_mtu		= libipw_change_mtu,
 	.ndo_tx_timeout		= ipw2100_tx_timeout,
 	.ndo_set_mac_address	= ipw2100_set_address,
 	.ndo_validate_addr	= eth_validate_addr,
···
 	dev->wireless_data = &priv->wireless_data;
 	dev->watchdog_timeo = 3 * HZ;
 	dev->irq = 0;
+	dev->min_mtu = 68;
+	dev->max_mtu = LIBIPW_DATA_LEN;
 
 	/* NOTE: We don't use the wireless_handlers hook
 	 * in dev as the system will start throwing WX requests

drivers/net/wireless/intel/ipw2x00/ipw2200.c

···
 	.ndo_open 		= ipw_prom_open,
 	.ndo_stop		= ipw_prom_stop,
 	.ndo_start_xmit		= ipw_prom_hard_start_xmit,
-	.ndo_change_mtu		= libipw_change_mtu,
 	.ndo_set_mac_address 	= eth_mac_addr,
 	.ndo_validate_addr	= eth_validate_addr,
 };
···
 
 	priv->prom_net_dev->type = ARPHRD_IEEE80211_RADIOTAP;
 	priv->prom_net_dev->netdev_ops = &ipw_prom_netdev_ops;
+
+	priv->prom_net_dev->min_mtu = 68;
+	priv->prom_net_dev->max_mtu = LIBIPW_DATA_LEN;
 
 	priv->prom_priv->ieee->iw_mode = IW_MODE_MONITOR;
 	SET_NETDEV_DEV(priv->prom_net_dev, &priv->pci_dev->dev);
···
 	.ndo_set_rx_mode	= ipw_net_set_multicast_list,
 	.ndo_set_mac_address	= ipw_net_set_mac_address,
 	.ndo_start_xmit		= libipw_xmit,
-	.ndo_change_mtu		= libipw_change_mtu,
 	.ndo_validate_addr	= eth_validate_addr,
 };
 
···
 	net_dev->wireless_data = &priv->wireless_data;
 	net_dev->wireless_handlers = &ipw_wx_handler_def;
 	net_dev->ethtool_ops = &ipw_ethtool_ops;
+
+	net_dev->min_mtu = 68;
+	net_dev->max_mtu = LIBIPW_DATA_LEN;
 
 	err = sysfs_create_group(&pdev->dev.kobj, &ipw_attribute_group);
 	if (err) {

drivers/net/wireless/intel/ipw2x00/libipw.h

···
 /* libipw.c */
 void free_libipw(struct net_device *dev, int monitor);
 struct net_device *alloc_libipw(int sizeof_priv, int monitor);
-int libipw_change_mtu(struct net_device *dev, int new_mtu);
 
 void libipw_networks_age(struct libipw_device *ieee, unsigned long age_secs);
 

drivers/net/wireless/intel/ipw2x00/libipw_module.c

···
 			      &ieee->network_free_list);
 }
 
-int libipw_change_mtu(struct net_device *dev, int new_mtu)
-{
-	if ((new_mtu < 68) || (new_mtu > LIBIPW_DATA_LEN))
-		return -EINVAL;
-	dev->mtu = new_mtu;
-	return 0;
-}
-EXPORT_SYMBOL(libipw_change_mtu);
-
 struct net_device *alloc_libipw(int sizeof_priv, int monitor)
 {
 	struct libipw_device *ieee;

drivers/net/wireless/intersil/hostap/hostap_main.c

···
 }
 
 
-static int prism2_change_mtu(struct net_device *dev, int new_mtu)
-{
-	if (new_mtu < PRISM2_MIN_MTU || new_mtu > PRISM2_MAX_MTU)
-		return -EINVAL;
-
-	dev->mtu = new_mtu;
-	return 0;
-}
-
-
 static void prism2_tx_timeout(struct net_device *dev)
 {
 	struct hostap_interface *iface;
···
 	.ndo_do_ioctl		= hostap_ioctl,
 	.ndo_set_mac_address	= prism2_set_mac_address,
 	.ndo_set_rx_mode	= hostap_set_multicast_list,
-	.ndo_change_mtu 	= prism2_change_mtu,
 	.ndo_tx_timeout 	= prism2_tx_timeout,
 	.ndo_validate_addr	= eth_validate_addr,
 };
···
 	.ndo_do_ioctl		= hostap_ioctl,
 	.ndo_set_mac_address	= prism2_set_mac_address,
 	.ndo_set_rx_mode	= hostap_set_multicast_list,
-	.ndo_change_mtu 	= prism2_change_mtu,
 	.ndo_tx_timeout 	= prism2_tx_timeout,
 	.ndo_validate_addr	= eth_validate_addr,
 };
···
 	.ndo_do_ioctl		= hostap_ioctl,
 	.ndo_set_mac_address	= prism2_set_mac_address,
 	.ndo_set_rx_mode	= hostap_set_multicast_list,
-	.ndo_change_mtu 	= prism2_change_mtu,
 	.ndo_tx_timeout 	= prism2_tx_timeout,
 	.ndo_validate_addr	= eth_validate_addr,
 };
···
 
 	iface = netdev_priv(dev);
 	ether_setup(dev);
+	dev->min_mtu = PRISM2_MIN_MTU;
+	dev->max_mtu = PRISM2_MAX_MTU;
 	dev->priv_flags &= ~IFF_TX_SKB_SHARING;
 
 	/* kernel callbacks */

drivers/net/wireless/intersil/orinoco/main.c

···
 {
 	struct orinoco_private *priv = ndev_priv(dev);
 
-	if ((new_mtu < ORINOCO_MIN_MTU) || (new_mtu > ORINOCO_MAX_MTU))
-		return -EINVAL;
-
 	/* MTU + encapsulation + header length */
 	if ((new_mtu + ENCAPS_OVERHEAD + sizeof(struct ieee80211_hdr)) >
 	     (priv->nicbuf_size - ETH_HLEN))
···
 
 	dev->base_addr = base_addr;
 	dev->irq = irq;
+
+	dev->min_mtu = ORINOCO_MIN_MTU;
+	dev->max_mtu = ORINOCO_MAX_MTU;
 
 	SET_NETDEV_DEV(dev, priv->dev);
 	ret = register_netdev(dev);

drivers/net/xen-netback/interface.c

···
 static int xenvif_change_mtu(struct net_device *dev, int mtu)
 {
 	struct xenvif *vif = netdev_priv(dev);
-	int max = vif->can_sg ? 65535 - VLAN_ETH_HLEN : ETH_DATA_LEN;
+	int max = vif->can_sg ? ETH_MAX_MTU - VLAN_ETH_HLEN : ETH_DATA_LEN;
 
 	if (mtu > max)
 		return -EINVAL;
···
 	dev->ethtool_ops = &xenvif_ethtool_ops;
 
 	dev->tx_queue_len = XENVIF_QUEUE_LENGTH;
+
+	dev->min_mtu = 0;
+	dev->max_mtu = ETH_MAX_MTU - VLAN_ETH_HLEN;
 
 	/*
 	 * Initialise a dummy MAC address. We choose the numerically

drivers/net/xen-netfront.c

···
 	netdev->features |= netdev->hw_features;
 
 	netdev->ethtool_ops = &xennet_ethtool_ops;
+	netdev->min_mtu = 0;
+	netdev->max_mtu = XEN_NETIF_MAX_TX_SIZE;
 	SET_NETDEV_DEV(netdev, &dev->dev);
 
 	np->netdev = netdev;

drivers/s390/net/ctcm_main.c

···
 	struct ctcm_priv *priv;
 	int max_bufsize;
 
-	if (new_mtu < 576 || new_mtu > 65527)
-		return -EINVAL;
-
 	priv = dev->ml_priv;
 	max_bufsize = priv->channel[CTCM_READ]->max_bufsize;
 
···
 	dev->type = ARPHRD_SLIP;
 	dev->tx_queue_len = 100;
 	dev->flags = IFF_POINTOPOINT | IFF_NOARP;
+	dev->min_mtu = 576;
+	dev->max_mtu = 65527;
 }
 
 /*

drivers/s390/net/netiucv.c

···
 	return &priv->stats;
 }
 
-/**
- * netiucv_change_mtu
- * @dev: Pointer to interface struct.
- * @new_mtu: The new MTU to use for this interface.
- *
- * Sets MTU of an interface.
- *
- * Returns 0 on success, -EINVAL if MTU is out of valid range.
- *         (valid range is 576 .. NETIUCV_MTU_MAX).
- */
-static int netiucv_change_mtu(struct net_device * dev, int new_mtu)
-{
-	IUCV_DBF_TEXT(trace, 3, __func__);
-	if (new_mtu < 576 || new_mtu > NETIUCV_MTU_MAX) {
-		IUCV_DBF_TEXT(setup, 2, "given MTU out of valid range\n");
-		return -EINVAL;
-	}
-	dev->mtu = new_mtu;
-	return 0;
-}
-
 /*
  * attributes in sysfs
  */
···
 	.ndo_stop		= netiucv_close,
 	.ndo_get_stats		= netiucv_stats,
 	.ndo_start_xmit		= netiucv_tx,
-	.ndo_change_mtu	   	= netiucv_change_mtu,
 };
 
 static void netiucv_setup_netdevice(struct net_device *dev)
 {
 	dev->mtu	         = NETIUCV_MTU_DEFAULT;
+	dev->min_mtu		 = 576;
+	dev->max_mtu		 = NETIUCV_MTU_MAX;
 	dev->destructor          = netiucv_free_netdevice;
 	dev->hard_header_len     = NETIUCV_HDRLEN;
 	dev->addr_len            = 0;

drivers/s390/net/qeth_core_main.c

···
 	sprintf(dbf_text, "%8x", new_mtu);
 	QETH_CARD_TEXT(card, 4, dbf_text);
 
-	if (new_mtu < 64)
-		return -EINVAL;
-	if (new_mtu > 65535)
-		return -EINVAL;
 	if ((!qeth_is_supported(card, IPA_IP_FRAGMENTATION)) &&
 	    (!qeth_mtu_is_valid(card, new_mtu)))
 		return -EINVAL;

drivers/s390/net/qeth_l2_main.c

···
 	card->dev->ml_priv = card;
 	card->dev->watchdog_timeo = QETH_TX_TIMEOUT;
 	card->dev->mtu = card->info.initial_mtu;
+	card->dev->min_mtu = 64;
+	card->dev->max_mtu = ETH_MAX_MTU;
 	card->dev->netdev_ops = &qeth_l2_netdev_ops;
 	card->dev->ethtool_ops =
 		(card->info.type != QETH_CARD_TYPE_OSN) ?

drivers/s390/net/qeth_l3_main.c

···
 	card->dev->ml_priv = card;
 	card->dev->watchdog_timeo = QETH_TX_TIMEOUT;
 	card->dev->mtu = card->info.initial_mtu;
+	card->dev->min_mtu = 64;
+	card->dev->max_mtu = ETH_MAX_MTU;
 	card->dev->ethtool_ops = &qeth_l3_ethtool_ops;
 	card->dev->features |=	NETIF_F_HW_VLAN_CTAG_TX |
 				NETIF_F_HW_VLAN_CTAG_RX |

drivers/staging/unisys/include/iochannel.h

···
 
 };
 
-#define		ETH_HEADER_SIZE 14	/* size of ethernet header */
-
 #define		ETH_MIN_DATA_SIZE 46	/* minimum eth data size */
-#define		ETH_MIN_PACKET_SIZE (ETH_HEADER_SIZE + ETH_MIN_DATA_SIZE)
+#define		ETH_MIN_PACKET_SIZE (ETH_HLEN + ETH_MIN_DATA_SIZE)
 
-#define		ETH_MAX_MTU 16384	/* maximum data size */
+#define		VISOR_ETH_MAX_MTU 16384	/* maximum data size */
 
 #ifndef MAX_MACADDR_LEN
 #define MAX_MACADDR_LEN 6	/* number of bytes in MAC address */
···
 	int len;	/* full length of data in the packet */
 	int num_frags;	/* number of fragments in frags containing data */
 	struct phys_info frags[MAX_PHYS_INFO];	/* physical page information */
-	char ethhdr[ETH_HEADER_SIZE];	/* the ethernet header  */
+	char ethhdr[ETH_HLEN];	/* the ethernet header  */
 	struct {
 		/* these are needed for csum at uisnic end */
 		u8 valid;	/* 1 = struct is valid - else ignore */
···
  */
 #define RCVPOST_BUF_SIZE 4032
 #define MAX_NET_RCV_CHAIN \
-	((ETH_MAX_MTU + ETH_HEADER_SIZE + RCVPOST_BUF_SIZE - 1) \
+	((VISOR_ETH_MAX_MTU + ETH_HLEN + RCVPOST_BUF_SIZE - 1) \
 	/ RCVPOST_BUF_SIZE)
 
 struct net_pkt_rcvpost {

drivers/staging/unisys/visornic/visornic_main.c

···
 	 * pointing to
 	 */
 	firstfraglen = skb->len - skb->data_len;
-	if (firstfraglen < ETH_HEADER_SIZE) {
+	if (firstfraglen < ETH_HLEN) {
 		spin_unlock_irqrestore(&devdata->priv_lock, flags);
 		devdata->busy_cnt++;
 		dev_err(&netdev->dev,
···
 	/* copy ethernet header from first frag into ocmdrsp
 	 * - everything else will be pass in frags & DMA'ed
 	 */
-	memcpy(cmdrsp->net.xmt.ethhdr, skb->data, ETH_HEADER_SIZE);
+	memcpy(cmdrsp->net.xmt.ethhdr, skb->data, ETH_HLEN);
 	/* copy frags info - from skb->data we need to only provide access
 	 * beyond eth header
 	 */

drivers/staging/wlan-ng/p80211netdev.c

···
 	return result;
 }
 
-static int wlan_change_mtu(struct net_device *dev, int new_mtu)
-{
-	/* 2312 is max 802.11 payload, 20 is overhead, (ether + llc +snap)
-	   and another 8 for wep. */
-	if ((new_mtu < 68) || (new_mtu > (2312 - 20 - 8)))
-		return -EINVAL;
-
-	dev->mtu = new_mtu;
-
-	return 0;
-}
-
 static const struct net_device_ops p80211_netdev_ops = {
 	.ndo_init = p80211knetdev_init,
 	.ndo_open = p80211knetdev_open,
···
 	.ndo_do_ioctl = p80211knetdev_do_ioctl,
 	.ndo_set_mac_address = p80211knetdev_set_mac_address,
 	.ndo_tx_timeout = p80211knetdev_tx_timeout,
-	.ndo_change_mtu = wlan_change_mtu,
 	.ndo_validate_addr = eth_validate_addr,
 };
 
···
 		wdev->wiphy = wiphy;
 		wdev->iftype = NL80211_IFTYPE_STATION;
 		netdev->ieee80211_ptr = wdev;
+		netdev->min_mtu = 68;
+		/* 2312 is max 802.11 payload, 20 is overhead,
+		 * (ether + llc + snap) and another 8 for wep.
+		 */
+		netdev->max_mtu = (2312 - 20 - 8);
 
 		netif_stop_queue(netdev);
 		netif_carrier_off(netdev);

drivers/tty/n_gsm.c

···
 	return;
 }
 
-static int gsm_change_mtu(struct net_device *net, int new_mtu)
-{
-	struct gsm_mux_net *mux_net = netdev_priv(net);
-	if ((new_mtu < 8) || (new_mtu > mux_net->dlci->gsm->mtu))
-		return -EINVAL;
-	net->mtu = new_mtu;
-	return 0;
-}
-
 static void gsm_mux_net_init(struct net_device *net)
 {
 	static const struct net_device_ops gsm_netdev_ops = {
···
 		.ndo_start_xmit		= gsm_mux_net_start_xmit,
 		.ndo_tx_timeout		= gsm_mux_net_tx_timeout,
 		.ndo_get_stats		= gsm_mux_net_get_stats,
-		.ndo_change_mtu		= gsm_change_mtu,
 	};
 
 	net->netdev_ops = &gsm_netdev_ops;
···
 		return -ENOMEM;
 	}
 	net->mtu = dlci->gsm->mtu;
+	net->min_mtu = 8;
+	net->max_mtu = dlci->gsm->mtu;
 	mux_net = netdev_priv(net);
 	mux_net->dlci = dlci;
 	kref_init(&mux_net->ref);

drivers/tty/synclink.c

···
 static const struct net_device_ops hdlcdev_ops = {
 	.ndo_open       = hdlcdev_open,
 	.ndo_stop       = hdlcdev_close,
-	.ndo_change_mtu = hdlc_change_mtu,
 	.ndo_start_xmit = hdlc_start_xmit,
 	.ndo_do_ioctl   = hdlcdev_ioctl,
 	.ndo_tx_timeout = hdlcdev_tx_timeout,

drivers/tty/synclink_gt.c

···
 static const struct net_device_ops hdlcdev_ops = {
 	.ndo_open       = hdlcdev_open,
 	.ndo_stop       = hdlcdev_close,
-	.ndo_change_mtu = hdlc_change_mtu,
 	.ndo_start_xmit = hdlc_start_xmit,
 	.ndo_do_ioctl   = hdlcdev_ioctl,
 	.ndo_tx_timeout = hdlcdev_tx_timeout,

drivers/tty/synclinkmp.c

···
 static const struct net_device_ops hdlcdev_ops = {
 	.ndo_open       = hdlcdev_open,
 	.ndo_stop       = hdlcdev_close,
-	.ndo_change_mtu = hdlc_change_mtu,
 	.ndo_start_xmit = hdlc_start_xmit,
 	.ndo_do_ioctl   = hdlcdev_ioctl,
 	.ndo_tx_timeout = hdlcdev_tx_timeout,

drivers/usb/gadget/function/f_phonet.c

···
 	return NETDEV_TX_OK;
 }
 
-static int pn_net_mtu(struct net_device *dev, int new_mtu)
-{
-	if ((new_mtu < PHONET_MIN_MTU) || (new_mtu > PHONET_MAX_MTU))
-		return -EINVAL;
-	dev->mtu = new_mtu;
-	return 0;
-}
-
 static const struct net_device_ops pn_netdev_ops = {
 	.ndo_open	= pn_net_open,
 	.ndo_stop	= pn_net_close,
 	.ndo_start_xmit	= pn_net_xmit,
-	.ndo_change_mtu	= pn_net_mtu,
 };
 
 static void pn_net_setup(struct net_device *dev)
···
 	dev->type		= ARPHRD_PHONET;
 	dev->flags		= IFF_POINTOPOINT | IFF_NOARP;
 	dev->mtu		= PHONET_DEV_MTU;
+	dev->min_mtu		= PHONET_MIN_MTU;
+	dev->max_mtu		= PHONET_MAX_MTU;
 	dev->hard_header_len	= 1;
 	dev->dev_addr[0]	= PN_MEDIA_USB;
 	dev->addr_len		= 1;

drivers/usb/gadget/function/u_ether.c

···
 
 /* NETWORK DRIVER HOOKUP (to the layer above this driver) */
 
-static int ueth_change_mtu(struct net_device *net, int new_mtu)
-{
-	if (new_mtu <= ETH_HLEN || new_mtu > GETHER_MAX_ETH_FRAME_LEN)
-		return -ERANGE;
-	net->mtu = new_mtu;
-
-	return 0;
-}
-
 static void eth_get_drvinfo(struct net_device *net, struct ethtool_drvinfo *p)
 {
 	struct eth_dev *dev = netdev_priv(net);
···
 	.ndo_open		= eth_open,
 	.ndo_stop		= eth_stop,
 	.ndo_start_xmit		= eth_start_xmit,
-	.ndo_change_mtu		= ueth_change_mtu,
 	.ndo_set_mac_address 	= eth_mac_addr,
 	.ndo_validate_addr	= eth_validate_addr,
 };
···
 	net->netdev_ops = &eth_netdev_ops;
 
 	net->ethtool_ops = &ops;
+
+	/* MTU range: 14 - 15412 */
+	net->min_mtu = ETH_HLEN;
+	net->max_mtu = GETHER_MAX_ETH_FRAME_LEN;
 
 	dev->gadget = g;
 	SET_NETDEV_DEV(net, &g->dev);

include/linux/fddidevice.h

···
 
 #ifdef __KERNEL__
 __be16 fddi_type_trans(struct sk_buff *skb, struct net_device *dev);
-int fddi_change_mtu(struct net_device *dev, int new_mtu);
 struct net_device *alloc_fddidev(int sizeof_priv);
 #endif
 

include/linux/hdlc.h

···
 int hdlc_open(struct net_device *dev);
 /* Must be called by hardware driver when HDLC device is being closed */
 void hdlc_close(struct net_device *dev);
-/* May be used by hardware driver */
-int hdlc_change_mtu(struct net_device *dev, int new_mtu);
 /* Must be pointed to by hw driver's dev->netdev_ops->ndo_start_xmit */
 netdev_tx_t hdlc_start_xmit(struct sk_buff *skb, struct net_device *dev);
 

include/linux/hippidevice.h

···
 };
 
 __be16 hippi_type_trans(struct sk_buff *skb, struct net_device *dev);
-int hippi_change_mtu(struct net_device *dev, int new_mtu);
 int hippi_mac_addr(struct net_device *dev, void *p);
 int hippi_neigh_setup_dev(struct net_device *dev, struct neigh_parms *p);
 struct net_device *alloc_hippi_dev(int sizeof_priv);

include/uapi/linux/if_ether.h

···
 #define ETH_FCS_LEN	4		/* Octets in the FCS		 */
 
 #define ETH_MIN_MTU	68		/* Min IPv4 MTU per RFC791	*/
+#define ETH_MAX_MTU	0xFFFFU		/* 65535, same as IP_MAX_MTU	*/
 
 /*
  *	These are the defined Ethernet Protocol ID's.

net/802/fddi.c

···
 
 EXPORT_SYMBOL(fddi_type_trans);
 
-int fddi_change_mtu(struct net_device *dev, int new_mtu)
-{
-	if ((new_mtu < FDDI_K_SNAP_HLEN) || (new_mtu > FDDI_K_SNAP_DLEN))
-		return -EINVAL;
-	dev->mtu = new_mtu;
-	return 0;
-}
-EXPORT_SYMBOL(fddi_change_mtu);
-
 static const struct header_ops fddi_header_ops = {
 	.create		= fddi_header,
 };
···
 	dev->type		= ARPHRD_FDDI;
 	dev->hard_header_len	= FDDI_K_SNAP_HLEN+3;	/* Assume 802.2 SNAP hdr len + 3 pad bytes */
 	dev->mtu		= FDDI_K_SNAP_DLEN;	/* Assume max payload of 802.2 SNAP frame */
+	dev->min_mtu		= FDDI_K_SNAP_HLEN;
+	dev->max_mtu		= FDDI_K_SNAP_DLEN;
 	dev->addr_len		= FDDI_K_ALEN;
 	dev->tx_queue_len	= 100;			/* Long queues on FDDI */
 	dev->flags		= IFF_BROADCAST | IFF_MULTICAST;

net/802/hippi.c

···
 
 EXPORT_SYMBOL(hippi_type_trans);
 
-int hippi_change_mtu(struct net_device *dev, int new_mtu)
-{
-	/*
-	 * HIPPI's got these nice large MTUs.
-	 */
-	if ((new_mtu < 68) || (new_mtu > 65280))
-		return -EINVAL;
-	dev->mtu = new_mtu;
-	return 0;
-}
-EXPORT_SYMBOL(hippi_change_mtu);
-
 /*
  * For HIPPI we will actually use the lower 4 bytes of the hardware
  * address as the I-FIELD rather than the actual hardware address.
···
 	dev->type		= ARPHRD_HIPPI;
 	dev->hard_header_len 	= HIPPI_HLEN;
 	dev->mtu		= 65280;
+	dev->min_mtu		= 68;
+	dev->max_mtu		= 65280;
 	dev->addr_len		= HIPPI_ALEN;
 	dev->tx_queue_len	= 25 /* 5 */;
 	memset(dev->broadcast, 0xFF, HIPPI_ALEN);

net/8021q/vlan_dev.c

···
 	dev->destructor		= vlan_dev_free;
 	dev->ethtool_ops	= &vlan_ethtool_ops;
 
+	dev->min_mtu		= 0;
+	dev->max_mtu		= ETH_MAX_MTU;
+
 	eth_zero_addr(dev->broadcast);
 }

net/atm/lec.c

···
 	return 0;
 }
 
-/* shamelessly stolen from drivers/net/net_init.c */
-static int lec_change_mtu(struct net_device *dev, int new_mtu)
-{
-	if ((new_mtu < 68) || (new_mtu > 18190))
-		return -EINVAL;
-	dev->mtu = new_mtu;
-	return 0;
-}
-
 static void lec_set_multicast_list(struct net_device *dev)
 {
 	/*
···
 	.ndo_open		= lec_open,
 	.ndo_stop		= lec_close,
 	.ndo_start_xmit		= lec_start_xmit,
-	.ndo_change_mtu		= lec_change_mtu,
 	.ndo_tx_timeout		= lec_tx_timeout,
 	.ndo_set_rx_mode	= lec_set_multicast_list,
 };
···
 		if (!dev_lec[i])
 			return -ENOMEM;
 		dev_lec[i]->netdev_ops = &lec_netdev_ops;
+		dev_lec[i]->max_mtu = 18190;
 		snprintf(dev_lec[i]->name, IFNAMSIZ, "lec%d", i);
 		if (register_netdev(dev_lec[i])) {
 			free_netdev(dev_lec[i]);

net/batman-adv/soft-interface.c

···
 	return 0;
 }
 
-static int batadv_interface_change_mtu(struct net_device *dev, int new_mtu)
-{
-	/* check ranges */
-	if ((new_mtu < 68) || (new_mtu > batadv_hardif_min_mtu(dev)))
-		return -EINVAL;
-
-	dev->mtu = new_mtu;
-
-	return 0;
-}
-
 /**
  * batadv_interface_set_rx_mode - set the rx mode of a device
  * @dev: registered network device to modify
···
 	.ndo_vlan_rx_add_vid = batadv_interface_add_vid,
 	.ndo_vlan_rx_kill_vid = batadv_interface_kill_vid,
 	.ndo_set_mac_address = batadv_interface_set_mac_addr,
-	.ndo_change_mtu = batadv_interface_change_mtu,
 	.ndo_set_rx_mode = batadv_interface_set_rx_mode,
 	.ndo_start_xmit = batadv_interface_tx,
 	.ndo_validate_addr = eth_validate_addr,
···
 	dev_net_set(soft_iface, net);
 
 	soft_iface->rtnl_link_ops = &batadv_link_ops;
+	soft_iface->max_mtu = batadv_hardif_min_mtu(soft_iface);
 
 	ret = register_netdevice(soft_iface);
 	if (ret < 0) {

net/bridge/br_device.c

···
 static int br_change_mtu(struct net_device *dev, int new_mtu)
 {
 	struct net_bridge *br = netdev_priv(dev);
-	if (new_mtu < 68 || new_mtu > br_min_mtu(br))
+	if (new_mtu > br_min_mtu(br))
 		return -EINVAL;
 
 	dev->mtu = new_mtu;
···
 	br->bridge_hello_time = br->hello_time = 2 * HZ;
 	br->bridge_forward_delay = br->forward_delay = 15 * HZ;
 	br->ageing_time = BR_DEFAULT_AGEING_TIME;
+	dev->max_mtu = ETH_MAX_MTU;
 
 	br_netfilter_rtable_init(br);
 	br_stp_timer_init(br);

net/hsr/hsr_device.c

···
 	random_ether_addr(dev->dev_addr);
 
 	ether_setup(dev);
+	dev->min_mtu = 0;
 	dev->header_ops = &hsr_header_ops;
 	dev->netdev_ops = &hsr_device_ops;
 	SET_NETDEV_DEVTYPE(dev, &hsr_type);

net/ipv4/ip_tunnel.c

···
 {
 	struct ip_tunnel *nt;
 	struct net_device *dev;
+	int t_hlen;
 
 	BUG_ON(!itn->fb_tunnel_dev);
 	dev = __ip_tunnel_create(net, itn->fb_tunnel_dev->rtnl_link_ops, parms);
···
 	dev->mtu = ip_tunnel_bind_dev(dev);
 
 	nt = netdev_priv(dev);
+	t_hlen = nt->hlen + sizeof(struct iphdr);
+	dev->min_mtu = ETH_MIN_MTU;
+	dev->max_mtu = 0xFFF8 - dev->hard_header_len - t_hlen;
 	ip_tunnel_add(itn, nt);
 	return nt;
 }
···
 	int t_hlen = tunnel->hlen + sizeof(struct iphdr);
 	int max_mtu = 0xFFF8 - dev->hard_header_len - t_hlen;
 
-	if (new_mtu < 68)
+	if (new_mtu < ETH_MIN_MTU)
 		return -EINVAL;
 
 	if (new_mtu > max_mtu) {

net/ipv6/ip6_tunnel.c

···
 	struct ip6_tnl *tnl = netdev_priv(dev);
 
 	if (tnl->parms.proto == IPPROTO_IPIP) {
-		if (new_mtu < 68)
+		if (new_mtu < ETH_MIN_MTU)
 			return -EINVAL;
 	} else {
 		if (new_mtu < IPV6_MIN_MTU)
···
 	dev->mtu = ETH_DATA_LEN - t_hlen;
 	if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
 		dev->mtu -= 8;
+	dev->min_mtu = ETH_MIN_MTU;
+	dev->max_mtu = 0xFFF8 - dev->hard_header_len;
 
 	return 0;
 

net/ipv6/ip6_vti.c

···
 	return err;
 }
 
-/**
- * vti6_tnl_change_mtu - change mtu manually for tunnel device
- *   @dev: virtual device associated with tunnel
- *   @new_mtu: the new mtu
- *
- * Return:
- *   0 on success,
- *   %-EINVAL if mtu too small
- **/
-static int vti6_change_mtu(struct net_device *dev, int new_mtu)
-{
-	if (new_mtu < IPV6_MIN_MTU)
-		return -EINVAL;
-
-	dev->mtu = new_mtu;
-	return 0;
-}
-
 static const struct net_device_ops vti6_netdev_ops = {
 	.ndo_init	= vti6_dev_init,
 	.ndo_uninit	= vti6_dev_uninit,
 	.ndo_start_xmit = vti6_tnl_xmit,
 	.ndo_do_ioctl	= vti6_ioctl,
-	.ndo_change_mtu = vti6_change_mtu,
 	.ndo_get_stats64 = ip_tunnel_get_stats64,
 	.ndo_get_iflink = ip6_tnl_get_iflink,
 };
···
 	dev->type = ARPHRD_TUNNEL6;
 	dev->hard_header_len = LL_MAX_HEADER + sizeof(struct ipv6hdr);
 	dev->mtu = ETH_DATA_LEN;
+	dev->min_mtu = IPV6_MIN_MTU;
+	dev->max_mtu = IP_MAX_MTU;
 	dev->flags |= IFF_NOARP;
 	dev->addr_len = sizeof(struct in6_addr);
 	netif_keep_dst(dev);

net/ipv6/sit.c

···
 	return err;
 }
 
-static int ipip6_tunnel_change_mtu(struct net_device *dev, int new_mtu)
-{
-	struct ip_tunnel *tunnel = netdev_priv(dev);
-	int t_hlen = tunnel->hlen + sizeof(struct iphdr);
-
-	if (new_mtu < IPV6_MIN_MTU || new_mtu > 0xFFF8 - t_hlen)
-		return -EINVAL;
-	dev->mtu = new_mtu;
-	return 0;
-}
-
 static const struct net_device_ops ipip6_netdev_ops = {
 	.ndo_init	= ipip6_tunnel_init,
 	.ndo_uninit	= ipip6_tunnel_uninit,
 	.ndo_start_xmit	= sit_tunnel_xmit,
 	.ndo_do_ioctl	= ipip6_tunnel_ioctl,
-	.ndo_change_mtu	= ipip6_tunnel_change_mtu,
 	.ndo_get_stats64 = ip_tunnel_get_stats64,
 	.ndo_get_iflink = ip_tunnel_get_iflink,
 };
···
 	dev->type		= ARPHRD_SIT;
 	dev->hard_header_len	= LL_MAX_HEADER + t_hlen;
 	dev->mtu		= ETH_DATA_LEN - t_hlen;
+	dev->min_mtu		= IPV6_MIN_MTU;
+	dev->max_mtu		= 0xFFF8 - t_hlen;
 	dev->flags		= IFF_NOARP;
 	netif_keep_dst(dev);
 	dev->addr_len		= 4;

net/mac80211/iface.c

···
 		ieee80211_hw_config(local, change);
 }
 
-static int ieee80211_change_mtu(struct net_device *dev, int new_mtu)
-{
-	if (new_mtu < 256 || new_mtu > IEEE80211_MAX_DATA_LEN)
-		return -EINVAL;
-
-	dev->mtu = new_mtu;
-	return 0;
-}
-
 static int ieee80211_verify_mac(struct ieee80211_sub_if_data *sdata, u8 *addr,
 				bool check_dup)
 {
···
 	.ndo_uninit		= ieee80211_uninit,
 	.ndo_start_xmit		= ieee80211_subif_start_xmit,
 	.ndo_set_rx_mode	= ieee80211_set_multicast_list,
-	.ndo_change_mtu 	= ieee80211_change_mtu,
 	.ndo_set_mac_address 	= ieee80211_change_mac,
 	.ndo_select_queue	= ieee80211_netdev_select_queue,
 	.ndo_get_stats64	= ieee80211_get_stats64,
···
 	.ndo_uninit		= ieee80211_uninit,
 	.ndo_start_xmit		= ieee80211_monitor_start_xmit,
 	.ndo_set_rx_mode	= ieee80211_set_multicast_list,
-	.ndo_change_mtu 	= ieee80211_change_mtu,
 	.ndo_set_mac_address 	= ieee80211_change_mac,
 	.ndo_select_queue	= ieee80211_monitor_select_queue,
 	.ndo_get_stats64	= ieee80211_get_stats64,
···
 		ndev->features |= local->hw.netdev_features;
 
 		netdev_set_default_ethtool_ops(ndev, &ieee80211_ethtool_ops);
+
+		/* MTU range: 256 - 2304 */
+		ndev->min_mtu = 256;
+		ndev->max_mtu = IEEE80211_MAX_DATA_LEN;
 
 		ret = register_netdevice(ndev);
 		if (ret) {

net/openvswitch/vport-internal_dev.c

···
 	.get_link	= ethtool_op_get_link,
 };
 
-static int internal_dev_change_mtu(struct net_device *netdev, int new_mtu)
-{
-	if (new_mtu < 68)
-		return -EINVAL;
-
-	netdev->mtu = new_mtu;
-	return 0;
-}
-
 static void internal_dev_destructor(struct net_device *dev)
 {
 	struct vport *vport = ovs_internal_dev_get_vport(dev);
···
 	.ndo_stop = internal_dev_stop,
 	.ndo_start_xmit = internal_dev_xmit,
 	.ndo_set_mac_address = eth_mac_addr,
-	.ndo_change_mtu = internal_dev_change_mtu,
 	.ndo_get_stats64 = internal_get_stats,
 	.ndo_set_rx_headroom = internal_set_rx_headroom,
 };

net/phonet/pep-gprs.c

···
 	return NETDEV_TX_OK;
 }
 
-static int gprs_set_mtu(struct net_device *dev, int new_mtu)
-{
-	if ((new_mtu < 576) || (new_mtu > (PHONET_MAX_MTU - 11)))
-		return -EINVAL;
-
-	dev->mtu = new_mtu;
-	return 0;
-}
-
 static const struct net_device_ops gprs_netdev_ops = {
 	.ndo_open	= gprs_open,
 	.ndo_stop	= gprs_close,
 	.ndo_start_xmit	= gprs_xmit,
-	.ndo_change_mtu	= gprs_set_mtu,
 };
 
 static void gprs_setup(struct net_device *dev)
···
 	dev->type		= ARPHRD_PHONET_PIPE;
 	dev->flags		= IFF_POINTOPOINT | IFF_NOARP;
 	dev->mtu		= GPRS_DEFAULT_MTU;
+	dev->min_mtu		= 576;
+	dev->max_mtu		= (PHONET_MAX_MTU - 11);
 	dev->hard_header_len	= 0;
 	dev->addr_len		= 0;
 	dev->tx_queue_len	= 10;

net/sched/sch_teql.c

···
 	struct teql_master *m = netdev_priv(dev);
 	struct Qdisc *q;
 
-	if (new_mtu < 68)
-		return -EINVAL;
-
 	q = m->slaves;
 	if (q) {
 		do {
···
 	dev->netdev_ops =       &teql_netdev_ops;
 	dev->type		= ARPHRD_VOID;
 	dev->mtu		= 1500;
+	dev->min_mtu		= 68;
+	dev->max_mtu		= 65535;
 	dev->tx_queue_len	= 100;
 	dev->flags		= IFF_NOARP;
 	dev->hard_header_len	= LL_MAX_HEADER;