ethernet: use core min/max MTU checking

et131x: min_mtu 64, max_mtu 9216

altera_tse: min_mtu 64, max_mtu 1500

amd8111e: min_mtu 60, max_mtu 9000

bnad: min_mtu 46, max_mtu 9000

macb: min_mtu 68, max_mtu 1500 or 10240 depending on hardware capability

xgmac: min_mtu 46, max_mtu 9000

cxgb2: min_mtu 68, max_mtu 9582 (pm3393) or 9600 (vsc7326)

enic: min_mtu 68, max_mtu 9000

gianfar: min_mtu 50, max_mu 9586

hns_enet: min_mtu 68, max_mtu 9578 (v1) or 9706 (v2)

ksz884x: min_mtu 60, max_mtu 1894

myri10ge: min_mtu 68, max_mtu 9000

natsemi: min_mtu 64, max_mtu 2024

nfp: min_mtu 68, max_mtu hardware-specific

forcedeth: min_mtu 64, max_mtu 1500 or 9100, depending on hardware

pch_gbe: min_mtu 46, max_mtu 10300

pasemi_mac: min_mtu 64, max_mtu 9000

qcaspi: min_mtu 46, max_mtu 1500
- remove qcaspi_netdev_change_mtu as it is now redundant

rocker: min_mtu 68, max_mtu 9000

sxgbe: min_mtu 68, max_mtu 9000

stmmac: min_mtu 46, max_mtu depends on hardware

tehuti: min_mtu 60, max_mtu 16384
- driver had no max mtu checking, but product docs say 16k jumbo packets
  are supported by the hardware

netcp: min_mtu 68, max_mtu 9486
- remove netcp_ndo_change_mtu as it is now redundant

via-velocity: min_mtu 64, max_mtu 9000

octeon: min_mtu 46, max_mtu 65370

CC: netdev@vger.kernel.org
CC: Mark Einon <mark.einon@gmail.com>
CC: Vince Bridgers <vbridger@opensource.altera.com>
CC: Rasesh Mody <rasesh.mody@qlogic.com>
CC: Nicolas Ferre <nicolas.ferre@atmel.com>
CC: Santosh Raspatur <santosh@chelsio.com>
CC: Hariprasad S <hariprasad@chelsio.com>
CC:  Christian Benvenuti <benve@cisco.com>
CC: Sujith Sankar <ssujith@cisco.com>
CC: Govindarajulu Varadarajan <_govind@gmx.com>
CC: Neel Patel <neepatel@cisco.com>
CC: Claudiu Manoil <claudiu.manoil@freescale.com>
CC: Yisen Zhuang <yisen.zhuang@huawei.com>
CC: Salil Mehta <salil.mehta@huawei.com>
CC: Hyong-Youb Kim <hykim@myri.com>
CC: Jakub Kicinski <jakub.kicinski@netronome.com>
CC: Olof Johansson <olof@lixom.net>
CC: Jiri Pirko <jiri@resnulli.us>
CC: Byungho An <bh74.an@samsung.com>
CC: Girish K S <ks.giri@samsung.com>
CC: Vipul Pandya <vipul.pandya@samsung.com>
CC: Giuseppe Cavallaro <peppe.cavallaro@st.com>
CC: Alexandre Torgue <alexandre.torgue@st.com>
CC: Andy Gospodarek <andy@greyhouse.net>
CC: Wingman Kwok <w-kwok2@ti.com>
CC: Murali Karicheri <m-karicheri2@ti.com>
CC: Francois Romieu <romieu@fr.zoreil.com>
Signed-off-by: Jarod Wilson <jarod@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/micrel/ksz884x.c

@@ -5807,24 +5807,19 @@ static int netdev_change_mtu(struct net_device *dev, int new_mtu)
 	if (hw->dev_count > 1)
 		if (dev != hw_priv->dev)
 			return 0;
-	if (new_mtu < 60)
-		return -EINVAL;
 
-	if (dev->mtu != new_mtu) {
-		hw_mtu = new_mtu + ETHERNET_HEADER_SIZE + 4;
-		if (hw_mtu > MAX_RX_BUF_SIZE)
-			return -EINVAL;
-		if (hw_mtu > REGULAR_RX_BUF_SIZE) {
-			hw->features |= RX_HUGE_FRAME;
-			hw_mtu = MAX_RX_BUF_SIZE;
-		} else {
-			hw->features &= ~RX_HUGE_FRAME;
-			hw_mtu = REGULAR_RX_BUF_SIZE;
-		}
-		hw_mtu = (hw_mtu + 3) & ~3;
-		hw_priv->mtu = hw_mtu;
-		dev->mtu = new_mtu;
+	hw_mtu = new_mtu + ETHERNET_HEADER_SIZE + 4;
+	if (hw_mtu > REGULAR_RX_BUF_SIZE) {
+		hw->features |= RX_HUGE_FRAME;
+		hw_mtu = MAX_RX_BUF_SIZE;
+	} else {
+		hw->features &= ~RX_HUGE_FRAME;
+		hw_mtu = REGULAR_RX_BUF_SIZE;
 	}
+	hw_mtu = (hw_mtu + 3) & ~3;
+	hw_priv->mtu = hw_mtu;
+	dev->mtu = new_mtu;
+
 	return 0;
 }
 
@@ -7099,6 +7094,12 @@ static int pcidev_init(struct pci_dev *pdev, const struct pci_device_id *id)
 
 		dev->netdev_ops = &netdev_ops;
 		dev->ethtool_ops = &netdev_ethtool_ops;
+
+		/* MTU range: 60 - 1894 */
+		dev->min_mtu = ETH_ZLEN;
+		dev->max_mtu = MAX_RX_BUF_SIZE -
+			       (ETH_HLEN + ETH_FCS_LEN + VLAN_HLEN);
+
 		if (register_netdev(dev))
 			goto pcidev_init_reg_err;
 		port_set_power_saving(port, true);