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: [email protected]
CC: Mark Einon <[email protected]>
CC: Vince Bridgers <[email protected]>
CC: Rasesh Mody <[email protected]>
CC: Nicolas Ferre <[email protected]>
CC: Santosh Raspatur <[email protected]>
CC: Hariprasad S <[email protected]>
CC:  Christian Benvenuti <[email protected]>
CC: Sujith Sankar <[email protected]>
CC: Govindarajulu Varadarajan <[email protected]>
CC: Neel Patel <[email protected]>
CC: Claudiu Manoil <[email protected]>
CC: Yisen Zhuang <[email protected]>
CC: Salil Mehta <[email protected]>
CC: Hyong-Youb Kim <[email protected]>
CC: Jakub Kicinski <[email protected]>
CC: Olof Johansson <[email protected]>
CC: Jiri Pirko <[email protected]>
CC: Byungho An <[email protected]>
CC: Girish K S <[email protected]>
CC: Vipul Pandya <[email protected]>
CC: Giuseppe Cavallaro <[email protected]>
CC: Alexandre Torgue <[email protected]>
CC: Andy Gospodarek <[email protected]>
CC: Wingman Kwok <[email protected]>
CC: Murali Karicheri <[email protected]>
CC: Francois Romieu <[email protected]>
Signed-off-by: Jarod Wilson <[email protected]>
Signed-off-by: David S. Miller <[email protected]>

Author: jarodwilson

drivers/net/ethernet/agere/et131x.c

@@ -176,6 +176,8 @@ MODULE_DESCRIPTION("10/100/1000 Base-T Ethernet Driver for the ET1310 by Agere S
 #define NUM_FBRS		2
 
 #define MAX_PACKETS_HANDLED	256
+#define ET131X_MIN_MTU		64
+#define ET131X_MAX_MTU		9216
 
 #define ALCATEL_MULTICAST_PKT	0x01000000
 #define ALCATEL_BROADCAST_PKT	0x02000000
@@ -3869,9 +3871,6 @@ static int et131x_change_mtu(struct net_device *netdev, int new_mtu)
 	int result = 0;
 	struct et131x_adapter *adapter = netdev_priv(netdev);
 
-	if (new_mtu < 64 || new_mtu > 9216)
-		return -EINVAL;
-
 	et131x_disable_txrx(netdev);
 
 	netdev->mtu = new_mtu;
@@ -3958,6 +3957,8 @@ static int et131x_pci_setup(struct pci_dev *pdev,
 
 	netdev->watchdog_timeo = ET131X_TX_TIMEOUT;
 	netdev->netdev_ops     = &et131x_netdev_ops;
+	netdev->min_mtu        = ET131X_MIN_MTU;
+	netdev->max_mtu        = ET131X_MAX_MTU;
 
 	SET_NETDEV_DEV(netdev, &pdev->dev);
 	netdev->ethtool_ops = &et131x_ethtool_ops;

drivers/net/ethernet/altera/altera_tse.h

@@ -443,7 +443,6 @@ struct altera_tse_private {
 	/* RX/TX MAC FIFO configs */
 	u32 tx_fifo_depth;
 	u32 rx_fifo_depth;
-	u32 max_mtu;
 
 	/* Hash filter settings */
 	u32 hash_filter;

drivers/net/ethernet/altera/altera_tse_main.c

@@ -994,20 +994,11 @@ static void tse_set_mac(struct altera_tse_private *priv, bool enable)
  */
 static int tse_change_mtu(struct net_device *dev, int new_mtu)
 {
-	struct altera_tse_private *priv = netdev_priv(dev);
-	unsigned int max_mtu = priv->max_mtu;
-	unsigned int min_mtu = ETH_ZLEN + ETH_FCS_LEN;
-
 	if (netif_running(dev)) {
 		netdev_err(dev, "must be stopped to change its MTU\n");
 		return -EBUSY;
 	}
 
-	if ((new_mtu < min_mtu) || (new_mtu > max_mtu)) {
-		netdev_err(dev, "invalid MTU, max MTU is: %u\n", max_mtu);
-		return -EINVAL;
-	}
-
 	dev->mtu = new_mtu;
 	netdev_update_features(dev);
 
@@ -1446,15 +1437,16 @@ static int altera_tse_probe(struct platform_device *pdev)
 		of_property_read_bool(pdev->dev.of_node,
 				      "altr,has-supplementary-unicast");
 
+	priv->dev->min_mtu = ETH_ZLEN + ETH_FCS_LEN;
 	/* Max MTU is 1500, ETH_DATA_LEN */
-	priv->max_mtu = ETH_DATA_LEN;
+	priv->dev->max_mtu = ETH_DATA_LEN;
 
 	/* Get the max mtu from the device tree. Note that the
 	 * "max-frame-size" parameter is actually max mtu. Definition
 	 * in the ePAPR v1.1 spec and usage differ, so go with usage.
 	 */
 	of_property_read_u32(pdev->dev.of_node, "max-frame-size",
-			     &priv->max_mtu);
+			     &priv->dev->max_mtu);
 
 	/* The DMA buffer size already accounts for an alignment bias
 	 * to avoid unaligned access exceptions for the NIOS processor,

drivers/net/ethernet/amd/amd8111e.c

@@ -1556,9 +1556,6 @@ static int amd8111e_change_mtu(struct net_device *dev, int new_mtu)
 	struct amd8111e_priv *lp = netdev_priv(dev);
 	int err;
 
-	if ((new_mtu < AMD8111E_MIN_MTU) || (new_mtu > AMD8111E_MAX_MTU))
-		return -EINVAL;
-
 	if (!netif_running(dev)) {
 		/* new_mtu will be used
 		 * when device starts netxt time
@@ -1874,6 +1871,8 @@ static int amd8111e_probe_one(struct pci_dev *pdev,
 	dev->ethtool_ops = &ops;
 	dev->irq =pdev->irq;
 	dev->watchdog_timeo = AMD8111E_TX_TIMEOUT;
+	dev->min_mtu = AMD8111E_MIN_MTU;
+	dev->max_mtu = AMD8111E_MAX_MTU;
 	netif_napi_add(dev, &lp->napi, amd8111e_rx_poll, 32);
 
 #if AMD8111E_VLAN_TAG_USED

drivers/net/ethernet/brocade/bna/bnad.c

@@ -3296,9 +3296,6 @@ bnad_change_mtu(struct net_device *netdev, int new_mtu)
 	struct bnad *bnad = netdev_priv(netdev);
 	u32 rx_count = 0, frame, new_frame;
 
-	if (new_mtu + ETH_HLEN < ETH_ZLEN || new_mtu > BNAD_JUMBO_MTU)
-		return -EINVAL;
-
 	mutex_lock(&bnad->conf_mutex);
 
 	mtu = netdev->mtu;
@@ -3465,6 +3462,10 @@ bnad_netdev_init(struct bnad *bnad, bool using_dac)
 	netdev->mem_start = bnad->mmio_start;
 	netdev->mem_end = bnad->mmio_start + bnad->mmio_len - 1;
 
+	/* MTU range: 46 - 9000 */
+	netdev->min_mtu = ETH_ZLEN - ETH_HLEN;
+	netdev->max_mtu = BNAD_JUMBO_MTU;
+
 	netdev->netdev_ops = &bnad_netdev_ops;
 	bnad_set_ethtool_ops(netdev);
 }

drivers/net/ethernet/cadence/macb.c

@@ -56,7 +56,7 @@
 #define MACB_MAX_TX_LEN		((unsigned int)((1 << MACB_TX_FRMLEN_SIZE) - 1))
 #define GEM_MAX_TX_LEN		((unsigned int)((1 << GEM_TX_FRMLEN_SIZE) - 1))
 
-#define GEM_MTU_MIN_SIZE	68
+#define GEM_MTU_MIN_SIZE	ETH_MIN_MTU
 
 #define MACB_WOL_HAS_MAGIC_PACKET	(0x1 << 0)
 #define MACB_WOL_ENABLED		(0x1 << 1)
@@ -1986,19 +1986,9 @@ static int macb_close(struct net_device *dev)
 
 static int macb_change_mtu(struct net_device *dev, int new_mtu)
 {
-	struct macb *bp = netdev_priv(dev);
-	u32 max_mtu;
-
 	if (netif_running(dev))
 		return -EBUSY;
 
-	max_mtu = ETH_DATA_LEN;
-	if (bp->caps & MACB_CAPS_JUMBO)
-		max_mtu = gem_readl(bp, JML) - ETH_HLEN - ETH_FCS_LEN;
-
-	if ((new_mtu > max_mtu) || (new_mtu < GEM_MTU_MIN_SIZE))
-		return -EINVAL;
-
 	dev->mtu = new_mtu;
 
 	return 0;
@@ -3027,6 +3017,13 @@ static int macb_probe(struct platform_device *pdev)
 		goto err_out_free_netdev;
 	}
 
+	/* MTU range: 68 - 1500 or 10240 */
+	dev->min_mtu = GEM_MTU_MIN_SIZE;
+	if (bp->caps & MACB_CAPS_JUMBO)
+		dev->max_mtu = gem_readl(bp, JML) - ETH_HLEN - ETH_FCS_LEN;
+	else
+		dev->max_mtu = ETH_DATA_LEN;
+
 	mac = of_get_mac_address(np);
 	if (mac)
 		ether_addr_copy(bp->dev->dev_addr, mac);

drivers/net/ethernet/calxeda/xgmac.c

@@ -394,7 +394,7 @@ struct xgmac_priv {
 };
 
 /* XGMAC Configuration Settings */
-#define MAX_MTU			9000
+#define XGMAC_MAX_MTU		9000
 #define PAUSE_TIME		0x400
 
 #define DMA_RX_RING_SZ		256
@@ -1360,20 +1360,6 @@ static void xgmac_set_rx_mode(struct net_device *dev)
  */
 static int xgmac_change_mtu(struct net_device *dev, int new_mtu)
 {
-	struct xgmac_priv *priv = netdev_priv(dev);
-	int old_mtu;
-
-	if ((new_mtu < 46) || (new_mtu > MAX_MTU)) {
-		netdev_err(priv->dev, "invalid MTU, max MTU is: %d\n", MAX_MTU);
-		return -EINVAL;
-	}
-
-	old_mtu = dev->mtu;
-
-	/* return early if the buffer sizes will not change */
-	if (old_mtu == new_mtu)
-		return 0;
-
 	/* Stop everything, get ready to change the MTU */
 	if (!netif_running(dev))
 		return 0;
@@ -1804,6 +1790,10 @@ static int xgmac_probe(struct platform_device *pdev)
 	ndev->features |= ndev->hw_features;
 	ndev->priv_flags |= IFF_UNICAST_FLT;
 
+	/* MTU range: 46 - 9000 */
+	ndev->min_mtu = ETH_ZLEN - ETH_HLEN;
+	ndev->max_mtu = XGMAC_MAX_MTU;
+
 	/* Get the MAC address */
 	xgmac_get_mac_addr(priv->base, ndev->dev_addr, 0);
 	if (!is_valid_ether_addr(ndev->dev_addr))

drivers/net/ethernet/chelsio/cxgb/common.h

@@ -85,6 +85,11 @@ struct t1_rx_mode {
 #define SPEED_INVALID 0xffff
 #define DUPLEX_INVALID 0xff
 
+/* Max frame size PM3393 can handle. Includes Ethernet header and CRC. */
+#define PM3393_MAX_FRAME_SIZE 9600
+
+#define VSC7326_MAX_MTU 9600
+
 enum {
 	CHBT_BOARD_N110,
 	CHBT_BOARD_N210,

drivers/net/ethernet/chelsio/cxgb/cxgb2.c

@@ -825,8 +825,6 @@ static int t1_change_mtu(struct net_device *dev, int new_mtu)
 
 	if (!mac->ops->set_mtu)
 		return -EOPNOTSUPP;
-	if (new_mtu < 68)
-		return -EINVAL;
 	if ((ret = mac->ops->set_mtu(mac, new_mtu)))
 		return ret;
 	dev->mtu = new_mtu;
@@ -1101,6 +1099,22 @@ static int init_one(struct pci_dev *pdev, const struct pci_device_id *ent)
 		netif_napi_add(netdev, &adapter->napi, t1_poll, 64);
 
 		netdev->ethtool_ops = &t1_ethtool_ops;
+
+		switch (bi->board) {
+		case CHBT_BOARD_CHT110:
+		case CHBT_BOARD_N110:
+		case CHBT_BOARD_N210:
+		case CHBT_BOARD_CHT210:
+			netdev->max_mtu = PM3393_MAX_FRAME_SIZE -
+					  (ETH_HLEN + ETH_FCS_LEN);
+			break;
+		case CHBT_BOARD_CHN204:
+			netdev->max_mtu = VSC7326_MAX_MTU;
+			break;
+		default:
+			netdev->max_mtu = ETH_DATA_LEN;
+			break;
+		}
 	}
 
 	if (t1_init_sw_modules(adapter, bi) < 0) {

drivers/net/ethernet/chelsio/cxgb/pm3393.c

@@ -47,9 +47,6 @@
 
 #define OFFSET(REG_ADDR)    ((REG_ADDR) << 2)
 
-/* Max frame size PM3393 can handle. Includes Ethernet header and CRC. */
-#define MAX_FRAME_SIZE  9600
-
 #define IPG 12
 #define TXXG_CONF1_VAL ((IPG << SUNI1x10GEXP_BITOFF_TXXG_IPGT) | \
 	SUNI1x10GEXP_BITMSK_TXXG_32BIT_ALIGN | SUNI1x10GEXP_BITMSK_TXXG_CRCEN | \
@@ -331,10 +328,7 @@ static int pm3393_set_mtu(struct cmac *cmac, int mtu)
 {
 	int enabled = cmac->instance->enabled;
 
-	/* MAX_FRAME_SIZE includes header + FCS, mtu doesn't */
-	mtu += 14 + 4;
-	if (mtu > MAX_FRAME_SIZE)
-		return -EINVAL;
+	mtu += ETH_HLEN + ETH_FCS_LEN;
 
 	/* Disable Rx/Tx MAC before configuring it. */
 	if (enabled)

drivers/net/ethernet/chelsio/cxgb/vsc7326.c

@@ -11,8 +11,6 @@
 /* 30 minutes for full statistics update */
 #define MAJOR_UPDATE_TICKS (1800 / STATS_TICK_SECS)
 
-#define MAX_MTU 9600
-
 /* The egress WM value 0x01a01fff should be used only when the
  * interface is down (MAC port disabled). This is a workaround
  * for disabling the T2/MAC flow-control. When the interface is
@@ -452,9 +450,6 @@ static int mac_set_mtu(struct cmac *mac, int mtu)
 {
 	int port = mac->instance->index;
 
-	if (mtu > MAX_MTU)
-		return -EINVAL;
-
 	/* max_len includes header and FCS */
 	vsc_write(mac->adapter, REG_MAX_LEN(port), mtu + 14 + 4);
 	return 0;

drivers/net/ethernet/cisco/enic/enic_main.c

@@ -1843,9 +1843,6 @@ static int enic_change_mtu(struct net_device *netdev, int new_mtu)
 	struct enic *enic = netdev_priv(netdev);
 	int running = netif_running(netdev);
 
-	if (new_mtu < ENIC_MIN_MTU || new_mtu > ENIC_MAX_MTU)
-		return -EINVAL;
-
 	if (enic_is_dynamic(enic) || enic_is_sriov_vf(enic))
 		return -EOPNOTSUPP;
 
@@ -2751,6 +2748,10 @@ static int enic_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
 
 	netdev->priv_flags |= IFF_UNICAST_FLT;
 
+	/* MTU range: 68 - 9000 */
+	netdev->min_mtu = ENIC_MIN_MTU;
+	netdev->max_mtu = ENIC_MAX_MTU;
+
 	err = register_netdev(netdev);
 	if (err) {
 		dev_err(dev, "Cannot register net device, aborting\n");

drivers/net/ethernet/cisco/enic/enic_res.h

@@ -30,7 +30,7 @@
 #define ENIC_MIN_RQ_DESCS		64
 #define ENIC_MAX_RQ_DESCS		4096
 
-#define ENIC_MIN_MTU			68
+#define ENIC_MIN_MTU			ETH_MIN_MTU
 #define ENIC_MAX_MTU			9000
 
 #define ENIC_MULTICAST_PERFECT_FILTERS	32

drivers/net/ethernet/freescale/gianfar.c

@@ -1338,7 +1338,10 @@ static int gfar_probe(struct platform_device *ofdev)
 
 	/* Fill in the dev structure */
 	dev->watchdog_timeo = TX_TIMEOUT;
+	/* MTU range: 50 - 9586 */
 	dev->mtu = 1500;
+	dev->min_mtu = 50;
+	dev->max_mtu = GFAR_JUMBO_FRAME_SIZE - ETH_HLEN;
 	dev->netdev_ops = &gfar_netdev_ops;
 	dev->ethtool_ops = &gfar_ethtool_ops;
 
@@ -2592,12 +2595,6 @@ static int gfar_set_mac_address(struct net_device *dev)
 static int gfar_change_mtu(struct net_device *dev, int new_mtu)
 {
 	struct gfar_private *priv = netdev_priv(dev);
-	int frame_size = new_mtu + ETH_HLEN;
-
-	if ((frame_size < 64) || (frame_size > GFAR_JUMBO_FRAME_SIZE)) {
-		netif_err(priv, drv, dev, "Invalid MTU setting\n");
-		return -EINVAL;
-	}
 
 	while (test_and_set_bit_lock(GFAR_RESETTING, &priv->state))
 		cpu_relax();

drivers/net/ethernet/hisilicon/hns/hns_dsaf_mac.c

@@ -446,8 +446,7 @@ int hns_mac_set_mtu(struct hns_mac_cb *mac_cb, u32 new_mtu)
 	if (mac_cb->mac_type == HNAE_PORT_DEBUG)
 		max_frm = MAC_MAX_MTU_DBG;
 
-	if ((new_mtu < MAC_MIN_MTU) || (new_frm > max_frm) ||
-	    (new_frm > HNS_RCB_RING_MAX_BD_PER_PKT * buf_size))
+	if (new_frm > HNS_RCB_RING_MAX_BD_PER_PKT * buf_size)
 		return -EINVAL;
 
 	if (!drv->config_max_frame_length)

drivers/net/ethernet/hisilicon/hns/hns_enet.c

@@ -22,6 +22,7 @@
 
 #include "hnae.h"
 #include "hns_enet.h"
+#include "hns_dsaf_mac.h"
 
 #define NIC_MAX_Q_PER_VF 16
 #define HNS_NIC_TX_TIMEOUT (5 * HZ)
@@ -1405,10 +1406,6 @@ static int hns_nic_change_mtu(struct net_device *ndev, int new_mtu)
 	struct hnae_handle *h = priv->ae_handle;
 	int ret;
 
-	/* MTU < 68 is an error and causes problems on some kernels */
-	if (new_mtu < 68)
-		return -EINVAL;
-
 	if (!h->dev->ops->set_mtu)
 		return -ENOTSUPP;
 
@@ -1953,14 +1950,20 @@ static int hns_nic_dev_probe(struct platform_device *pdev)
 		NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM | NETIF_F_RXCSUM;
 	ndev->vlan_features |= NETIF_F_SG | NETIF_F_GSO | NETIF_F_GRO;
 
+	/* MTU range: 68 - 9578 (v1) or 9706 (v2) */
+	ndev->min_mtu = MAC_MIN_MTU;
 	switch (priv->enet_ver) {
 	case AE_VERSION_2:
 		ndev->features |= NETIF_F_TSO | NETIF_F_TSO6;
 		ndev->hw_features |= NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM |
 			NETIF_F_RXCSUM | NETIF_F_SG | NETIF_F_GSO |
 			NETIF_F_GRO | NETIF_F_TSO | NETIF_F_TSO6;
+		ndev->max_mtu = MAC_MAX_MTU_V2 -
+				(ETH_HLEN + ETH_FCS_LEN + VLAN_HLEN);
 		break;
 	default:
+		ndev->max_mtu = MAC_MAX_MTU -
+				(ETH_HLEN + ETH_FCS_LEN + VLAN_HLEN);
 		break;
 	}