intel: Move the Intel wired LAN drivers

Moves the Intel wired LAN drivers into drivers/net/ethernet/intel/ and
the necessary Kconfig and Makefile changes.

Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>

1 files changed, 2332 insertions, 0 deletions

diff --git a/drivers/net/ethernet/intel/ixgb/ixgb_main.c b/drivers/net/ethernet/intel/ixgb/ixgb_main.c
new file mode 100644
index 000000000000..6a130eb51cfa
--- /dev/null
+++ b/drivers/net/ethernet/intel/ixgb/ixgb_main.c
@@ -0,0 +1,2332 @@
+/*******************************************************************************
+
+  Intel PRO/10GbE Linux driver
+  Copyright(c) 1999 - 2008 Intel Corporation.
+
+  This program is free software; you can redistribute it and/or modify it
+  under the terms and conditions of the GNU General Public License,
+  version 2, as published by the Free Software Foundation.
+
+  This program is distributed in the hope it will be useful, but WITHOUT
+  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+  more details.
+
+  You should have received a copy of the GNU General Public License along with
+  this program; if not, write to the Free Software Foundation, Inc.,
+  51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
+
+  The full GNU General Public License is included in this distribution in
+  the file called "COPYING".
+
+  Contact Information:
+  Linux NICS <linux.nics@intel.com>
+  e1000-devel Mailing List <e1000-devel@lists.sourceforge.net>
+  Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
+
+*******************************************************************************/
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/prefetch.h>
+#include "ixgb.h"
+
+char ixgb_driver_name[] = "ixgb";
+static char ixgb_driver_string[] = "Intel(R) PRO/10GbE Network Driver";
+
+#define DRIVERNAPI "-NAPI"
+#define DRV_VERSION "1.0.135-k2" DRIVERNAPI
+const char ixgb_driver_version[] = DRV_VERSION;
+static const char ixgb_copyright[] = "Copyright (c) 1999-2008 Intel Corporation.";
+
+#define IXGB_CB_LENGTH 256
+static unsigned int copybreak __read_mostly = IXGB_CB_LENGTH;
+module_param(copybreak, uint, 0644);
+MODULE_PARM_DESC(copybreak,
+	"Maximum size of packet that is copied to a new buffer on receive");
+
+/* ixgb_pci_tbl - PCI Device ID Table
+ *
+ * Wildcard entries (PCI_ANY_ID) should come last
+ * Last entry must be all 0s
+ *
+ * { Vendor ID, Device ID, SubVendor ID, SubDevice ID,
+ *   Class, Class Mask, private data (not used) }
+ */
+static DEFINE_PCI_DEVICE_TABLE(ixgb_pci_tbl) = {
+	{INTEL_VENDOR_ID, IXGB_DEVICE_ID_82597EX,
+	 PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
+	{INTEL_VENDOR_ID, IXGB_DEVICE_ID_82597EX_CX4,
+	 PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
+	{INTEL_VENDOR_ID, IXGB_DEVICE_ID_82597EX_SR,
+	 PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
+	{INTEL_VENDOR_ID, IXGB_DEVICE_ID_82597EX_LR,
+	 PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
+
+	/* required last entry */
+	{0,}
+};
+
+MODULE_DEVICE_TABLE(pci, ixgb_pci_tbl);
+
+/* Local Function Prototypes */
+static int ixgb_init_module(void);
+static void ixgb_exit_module(void);
+static int ixgb_probe(struct pci_dev *pdev, const struct pci_device_id *ent);
+static void __devexit ixgb_remove(struct pci_dev *pdev);
+static int ixgb_sw_init(struct ixgb_adapter *adapter);
+static int ixgb_open(struct net_device *netdev);
+static int ixgb_close(struct net_device *netdev);
+static void ixgb_configure_tx(struct ixgb_adapter *adapter);
+static void ixgb_configure_rx(struct ixgb_adapter *adapter);
+static void ixgb_setup_rctl(struct ixgb_adapter *adapter);
+static void ixgb_clean_tx_ring(struct ixgb_adapter *adapter);
+static void ixgb_clean_rx_ring(struct ixgb_adapter *adapter);
+static void ixgb_set_multi(struct net_device *netdev);
+static void ixgb_watchdog(unsigned long data);
+static netdev_tx_t ixgb_xmit_frame(struct sk_buff *skb,
+				   struct net_device *netdev);
+static struct net_device_stats *ixgb_get_stats(struct net_device *netdev);
+static int ixgb_change_mtu(struct net_device *netdev, int new_mtu);
+static int ixgb_set_mac(struct net_device *netdev, void *p);
+static irqreturn_t ixgb_intr(int irq, void *data);
+static bool ixgb_clean_tx_irq(struct ixgb_adapter *adapter);
+
+static int ixgb_clean(struct napi_struct *, int);
+static bool ixgb_clean_rx_irq(struct ixgb_adapter *, int *, int);
+static void ixgb_alloc_rx_buffers(struct ixgb_adapter *, int);
+
+static void ixgb_tx_timeout(struct net_device *dev);
+static void ixgb_tx_timeout_task(struct work_struct *work);
+
+static void ixgb_vlan_strip_enable(struct ixgb_adapter *adapter);
+static void ixgb_vlan_strip_disable(struct ixgb_adapter *adapter);
+static void ixgb_vlan_rx_add_vid(struct net_device *netdev, u16 vid);
+static void ixgb_vlan_rx_kill_vid(struct net_device *netdev, u16 vid);
+static void ixgb_restore_vlan(struct ixgb_adapter *adapter);
+
+#ifdef CONFIG_NET_POLL_CONTROLLER
+/* for netdump / net console */
+static void ixgb_netpoll(struct net_device *dev);
+#endif
+
+static pci_ers_result_t ixgb_io_error_detected (struct pci_dev *pdev,
+                             enum pci_channel_state state);
+static pci_ers_result_t ixgb_io_slot_reset (struct pci_dev *pdev);
+static void ixgb_io_resume (struct pci_dev *pdev);
+
+static struct pci_error_handlers ixgb_err_handler = {
+	.error_detected = ixgb_io_error_detected,
+	.slot_reset = ixgb_io_slot_reset,
+	.resume = ixgb_io_resume,
+};
+
+static struct pci_driver ixgb_driver = {
+	.name     = ixgb_driver_name,
+	.id_table = ixgb_pci_tbl,
+	.probe    = ixgb_probe,
+	.remove   = __devexit_p(ixgb_remove),
+	.err_handler = &ixgb_err_handler
+};
+
+MODULE_AUTHOR("Intel Corporation, <linux.nics@intel.com>");
+MODULE_DESCRIPTION("Intel(R) PRO/10GbE Network Driver");
+MODULE_LICENSE("GPL");
+MODULE_VERSION(DRV_VERSION);
+
+#define DEFAULT_DEBUG_LEVEL_SHIFT 3
+static int debug = DEFAULT_DEBUG_LEVEL_SHIFT;
+module_param(debug, int, 0);
+MODULE_PARM_DESC(debug, "Debug level (0=none,...,16=all)");
+
+/**
+ * ixgb_init_module - Driver Registration Routine
+ *
+ * ixgb_init_module is the first routine called when the driver is
+ * loaded. All it does is register with the PCI subsystem.
+ **/
+
+static int __init
+ixgb_init_module(void)
+{
+	pr_info("%s - version %s\n", ixgb_driver_string, ixgb_driver_version);
+	pr_info("%s\n", ixgb_copyright);
+
+	return pci_register_driver(&ixgb_driver);
+}
+
+module_init(ixgb_init_module);
+
+/**
+ * ixgb_exit_module - Driver Exit Cleanup Routine
+ *
+ * ixgb_exit_module is called just before the driver is removed
+ * from memory.
+ **/
+
+static void __exit
+ixgb_exit_module(void)
+{
+	pci_unregister_driver(&ixgb_driver);
+}
+
+module_exit(ixgb_exit_module);
+
+/**
+ * ixgb_irq_disable - Mask off interrupt generation on the NIC
+ * @adapter: board private structure
+ **/
+
+static void
+ixgb_irq_disable(struct ixgb_adapter *adapter)
+{
+	IXGB_WRITE_REG(&adapter->hw, IMC, ~0);
+	IXGB_WRITE_FLUSH(&adapter->hw);
+	synchronize_irq(adapter->pdev->irq);
+}
+
+/**
+ * ixgb_irq_enable - Enable default interrupt generation settings
+ * @adapter: board private structure
+ **/
+
+static void
+ixgb_irq_enable(struct ixgb_adapter *adapter)
+{
+	u32 val = IXGB_INT_RXT0 | IXGB_INT_RXDMT0 |
+		  IXGB_INT_TXDW | IXGB_INT_LSC;
+	if (adapter->hw.subsystem_vendor_id == SUN_SUBVENDOR_ID)
+		val |= IXGB_INT_GPI0;
+	IXGB_WRITE_REG(&adapter->hw, IMS, val);
+	IXGB_WRITE_FLUSH(&adapter->hw);
+}
+
+int
+ixgb_up(struct ixgb_adapter *adapter)
+{
+	struct net_device *netdev = adapter->netdev;
+	int err, irq_flags = IRQF_SHARED;
+	int max_frame = netdev->mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;
+	struct ixgb_hw *hw = &adapter->hw;
+
+	/* hardware has been reset, we need to reload some things */
+
+	ixgb_rar_set(hw, netdev->dev_addr, 0);
+	ixgb_set_multi(netdev);
+
+	ixgb_restore_vlan(adapter);
+
+	ixgb_configure_tx(adapter);
+	ixgb_setup_rctl(adapter);
+	ixgb_configure_rx(adapter);
+	ixgb_alloc_rx_buffers(adapter, IXGB_DESC_UNUSED(&adapter->rx_ring));
+
+	/* disable interrupts and get the hardware into a known state */
+	IXGB_WRITE_REG(&adapter->hw, IMC, 0xffffffff);
+
+	/* only enable MSI if bus is in PCI-X mode */
+	if (IXGB_READ_REG(&adapter->hw, STATUS) & IXGB_STATUS_PCIX_MODE) {
+		err = pci_enable_msi(adapter->pdev);
+		if (!err) {
+			adapter->have_msi = 1;
+			irq_flags = 0;
+		}
+		/* proceed to try to request regular interrupt */
+	}
+
+	err = request_irq(adapter->pdev->irq, ixgb_intr, irq_flags,
+	                  netdev->name, netdev);
+	if (err) {
+		if (adapter->have_msi)
+			pci_disable_msi(adapter->pdev);
+		netif_err(adapter, probe, adapter->netdev,
+			  "Unable to allocate interrupt Error: %d\n", err);
+		return err;
+	}
+
+	if ((hw->max_frame_size != max_frame) ||
+		(hw->max_frame_size !=
+		(IXGB_READ_REG(hw, MFS) >> IXGB_MFS_SHIFT))) {
+
+		hw->max_frame_size = max_frame;
+
+		IXGB_WRITE_REG(hw, MFS, hw->max_frame_size << IXGB_MFS_SHIFT);
+
+		if (hw->max_frame_size >
+		   IXGB_MAX_ENET_FRAME_SIZE_WITHOUT_FCS + ENET_FCS_LENGTH) {
+			u32 ctrl0 = IXGB_READ_REG(hw, CTRL0);
+
+			if (!(ctrl0 & IXGB_CTRL0_JFE)) {
+				ctrl0 |= IXGB_CTRL0_JFE;
+				IXGB_WRITE_REG(hw, CTRL0, ctrl0);
+			}
+		}
+	}
+
+	clear_bit(__IXGB_DOWN, &adapter->flags);
+
+	napi_enable(&adapter->napi);
+	ixgb_irq_enable(adapter);
+
+	netif_wake_queue(netdev);
+
+	mod_timer(&adapter->watchdog_timer, jiffies);
+
+	return 0;
+}
+
+void
+ixgb_down(struct ixgb_adapter *adapter, bool kill_watchdog)
+{
+	struct net_device *netdev = adapter->netdev;
+
+	/* prevent the interrupt handler from restarting watchdog */
+	set_bit(__IXGB_DOWN, &adapter->flags);
+
+	napi_disable(&adapter->napi);
+	/* waiting for NAPI to complete can re-enable interrupts */
+	ixgb_irq_disable(adapter);
+	free_irq(adapter->pdev->irq, netdev);
+
+	if (adapter->have_msi)
+		pci_disable_msi(adapter->pdev);
+
+	if (kill_watchdog)
+		del_timer_sync(&adapter->watchdog_timer);
+
+	adapter->link_speed = 0;
+	adapter->link_duplex = 0;
+	netif_carrier_off(netdev);
+	netif_stop_queue(netdev);
+
+	ixgb_reset(adapter);
+	ixgb_clean_tx_ring(adapter);
+	ixgb_clean_rx_ring(adapter);
+}
+
+void
+ixgb_reset(struct ixgb_adapter *adapter)
+{
+	struct ixgb_hw *hw = &adapter->hw;
+
+	ixgb_adapter_stop(hw);
+	if (!ixgb_init_hw(hw))
+		netif_err(adapter, probe, adapter->netdev, "ixgb_init_hw failed\n");
+
+	/* restore frame size information */
+	IXGB_WRITE_REG(hw, MFS, hw->max_frame_size << IXGB_MFS_SHIFT);
+	if (hw->max_frame_size >
+	    IXGB_MAX_ENET_FRAME_SIZE_WITHOUT_FCS + ENET_FCS_LENGTH) {
+		u32 ctrl0 = IXGB_READ_REG(hw, CTRL0);
+		if (!(ctrl0 & IXGB_CTRL0_JFE)) {
+			ctrl0 |= IXGB_CTRL0_JFE;
+			IXGB_WRITE_REG(hw, CTRL0, ctrl0);
+		}
+	}
+}
+
+static const struct net_device_ops ixgb_netdev_ops = {
+	.ndo_open 		= ixgb_open,
+	.ndo_stop		= ixgb_close,
+	.ndo_start_xmit		= ixgb_xmit_frame,
+	.ndo_get_stats		= ixgb_get_stats,
+	.ndo_set_multicast_list	= ixgb_set_multi,
+	.ndo_validate_addr	= eth_validate_addr,
+	.ndo_set_mac_address	= ixgb_set_mac,
+	.ndo_change_mtu		= ixgb_change_mtu,
+	.ndo_tx_timeout		= ixgb_tx_timeout,
+	.ndo_vlan_rx_add_vid	= ixgb_vlan_rx_add_vid,
+	.ndo_vlan_rx_kill_vid	= ixgb_vlan_rx_kill_vid,
+#ifdef CONFIG_NET_POLL_CONTROLLER
+	.ndo_poll_controller	= ixgb_netpoll,
+#endif
+};
+
+/**
+ * ixgb_probe - Device Initialization Routine
+ * @pdev: PCI device information struct
+ * @ent: entry in ixgb_pci_tbl
+ *
+ * Returns 0 on success, negative on failure
+ *
+ * ixgb_probe initializes an adapter identified by a pci_dev structure.
+ * The OS initialization, configuring of the adapter private structure,
+ * and a hardware reset occur.
+ **/
+
+static int __devinit
+ixgb_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
+{
+	struct net_device *netdev = NULL;
+	struct ixgb_adapter *adapter;
+	static int cards_found = 0;
+	int pci_using_dac;
+	int i;
+	int err;
+
+	err = pci_enable_device(pdev);
+	if (err)
+		return err;
+
+	pci_using_dac = 0;
+	err = dma_set_mask(&pdev->dev, DMA_BIT_MASK(64));
+	if (!err) {
+		err = dma_set_coherent_mask(&pdev->dev, DMA_BIT_MASK(64));
+		if (!err)
+			pci_using_dac = 1;
+	} else {
+		err = dma_set_mask(&pdev->dev, DMA_BIT_MASK(32));
+		if (err) {
+			err = dma_set_coherent_mask(&pdev->dev,
+						    DMA_BIT_MASK(32));
+			if (err) {
+				pr_err("No usable DMA configuration, aborting\n");
+				goto err_dma_mask;
+			}
+		}
+	}
+
+	err = pci_request_regions(pdev, ixgb_driver_name);
+	if (err)
+		goto err_request_regions;
+
+	pci_set_master(pdev);
+
+	netdev = alloc_etherdev(sizeof(struct ixgb_adapter));
+	if (!netdev) {
+		err = -ENOMEM;
+		goto err_alloc_etherdev;
+	}
+
+	SET_NETDEV_DEV(netdev, &pdev->dev);
+
+	pci_set_drvdata(pdev, netdev);
+	adapter = netdev_priv(netdev);
+	adapter->netdev = netdev;
+	adapter->pdev = pdev;
+	adapter->hw.back = adapter;
+	adapter->msg_enable = netif_msg_init(debug, DEFAULT_DEBUG_LEVEL_SHIFT);
+
+	adapter->hw.hw_addr = pci_ioremap_bar(pdev, BAR_0);
+	if (!adapter->hw.hw_addr) {
+		err = -EIO;
+		goto err_ioremap;
+	}
+
+	for (i = BAR_1; i <= BAR_5; i++) {
+		if (pci_resource_len(pdev, i) == 0)
+			continue;
+		if (pci_resource_flags(pdev, i) & IORESOURCE_IO) {
+			adapter->hw.io_base = pci_resource_start(pdev, i);
+			break;
+		}
+	}
+
+	netdev->netdev_ops = &ixgb_netdev_ops;
+	ixgb_set_ethtool_ops(netdev);
+	netdev->watchdog_timeo = 5 * HZ;
+	netif_napi_add(netdev, &adapter->napi, ixgb_clean, 64);
+
+	strncpy(netdev->name, pci_name(pdev), sizeof(netdev->name) - 1);
+
+	adapter->bd_number = cards_found;
+	adapter->link_speed = 0;
+	adapter->link_duplex = 0;
+
+	/* setup the private structure */
+
+	err = ixgb_sw_init(adapter);
+	if (err)
+		goto err_sw_init;
+
+	netdev->features = NETIF_F_SG |
+			   NETIF_F_HW_CSUM |
+			   NETIF_F_HW_VLAN_TX |
+			   NETIF_F_HW_VLAN_RX |
+			   NETIF_F_HW_VLAN_FILTER;
+	netdev->features |= NETIF_F_TSO;
+
+	if (pci_using_dac) {
+		netdev->features |= NETIF_F_HIGHDMA;
+		netdev->vlan_features |= NETIF_F_HIGHDMA;
+	}
+
+	/* make sure the EEPROM is good */
+
+	if (!ixgb_validate_eeprom_checksum(&adapter->hw)) {
+		netif_err(adapter, probe, adapter->netdev,
+			  "The EEPROM Checksum Is Not Valid\n");
+		err = -EIO;
+		goto err_eeprom;
+	}
+
+	ixgb_get_ee_mac_addr(&adapter->hw, netdev->dev_addr);
+	memcpy(netdev->perm_addr, netdev->dev_addr, netdev->addr_len);
+
+	if (!is_valid_ether_addr(netdev->perm_addr)) {
+		netif_err(adapter, probe, adapter->netdev, "Invalid MAC Address\n");
+		err = -EIO;
+		goto err_eeprom;
+	}
+
+	adapter->part_num = ixgb_get_ee_pba_number(&adapter->hw);
+
+	init_timer(&adapter->watchdog_timer);
+	adapter->watchdog_timer.function = ixgb_watchdog;
+	adapter->watchdog_timer.data = (unsigned long)adapter;
+
+	INIT_WORK(&adapter->tx_timeout_task, ixgb_tx_timeout_task);
+
+	strcpy(netdev->name, "eth%d");
+	err = register_netdev(netdev);
+	if (err)
+		goto err_register;
+
+	/* carrier off reporting is important to ethtool even BEFORE open */
+	netif_carrier_off(netdev);
+
+	netif_info(adapter, probe, adapter->netdev,
+		   "Intel(R) PRO/10GbE Network Connection\n");
+	ixgb_check_options(adapter);
+	/* reset the hardware with the new settings */
+
+	ixgb_reset(adapter);
+
+	cards_found++;
+	return 0;
+
+err_register:
+err_sw_init:
+err_eeprom:
+	iounmap(adapter->hw.hw_addr);
+err_ioremap:
+	free_netdev(netdev);
+err_alloc_etherdev:
+	pci_release_regions(pdev);
+err_request_regions:
+err_dma_mask:
+	pci_disable_device(pdev);
+	return err;
+}
+
+/**
+ * ixgb_remove - Device Removal Routine
+ * @pdev: PCI device information struct
+ *
+ * ixgb_remove is called by the PCI subsystem to alert the driver
+ * that it should release a PCI device.  The could be caused by a
+ * Hot-Plug event, or because the driver is going to be removed from
+ * memory.
+ **/
+
+static void __devexit
+ixgb_remove(struct pci_dev *pdev)
+{
+	struct net_device *netdev = pci_get_drvdata(pdev);
+	struct ixgb_adapter *adapter = netdev_priv(netdev);
+
+	cancel_work_sync(&adapter->tx_timeout_task);
+
+	unregister_netdev(netdev);
+
+	iounmap(adapter->hw.hw_addr);
+	pci_release_regions(pdev);
+
+	free_netdev(netdev);
+	pci_disable_device(pdev);
+}
+
+/**
+ * ixgb_sw_init - Initialize general software structures (struct ixgb_adapter)
+ * @adapter: board private structure to initialize
+ *
+ * ixgb_sw_init initializes the Adapter private data structure.
+ * Fields are initialized based on PCI device information and
+ * OS network device settings (MTU size).
+ **/
+
+static int __devinit
+ixgb_sw_init(struct ixgb_adapter *adapter)
+{
+	struct ixgb_hw *hw = &adapter->hw;
+	struct net_device *netdev = adapter->netdev;
+	struct pci_dev *pdev = adapter->pdev;
+
+	/* PCI config space info */
+
+	hw->vendor_id = pdev->vendor;
+	hw->device_id = pdev->device;
+	hw->subsystem_vendor_id = pdev->subsystem_vendor;
+	hw->subsystem_id = pdev->subsystem_device;
+
+	hw->max_frame_size = netdev->mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;
+	adapter->rx_buffer_len = hw->max_frame_size + 8; /* + 8 for errata */
+
+	if ((hw->device_id == IXGB_DEVICE_ID_82597EX) ||
+	    (hw->device_id == IXGB_DEVICE_ID_82597EX_CX4) ||
+	    (hw->device_id == IXGB_DEVICE_ID_82597EX_LR) ||
+	    (hw->device_id == IXGB_DEVICE_ID_82597EX_SR))
+		hw->mac_type = ixgb_82597;
+	else {
+		/* should never have loaded on this device */
+		netif_err(adapter, probe, adapter->netdev, "unsupported device id\n");
+	}
+
+	/* enable flow control to be programmed */
+	hw->fc.send_xon = 1;
+
+	set_bit(__IXGB_DOWN, &adapter->flags);
+	return 0;
+}
+
+/**
+ * ixgb_open - Called when a network interface is made active
+ * @netdev: network interface device structure
+ *
+ * Returns 0 on success, negative value on failure
+ *
+ * The open entry point is called when a network interface is made
+ * active by the system (IFF_UP).  At this point all resources needed
+ * for transmit and receive operations are allocated, the interrupt
+ * handler is registered with the OS, the watchdog timer is started,
+ * and the stack is notified that the interface is ready.
+ **/
+
+static int
+ixgb_open(struct net_device *netdev)
+{
+	struct ixgb_adapter *adapter = netdev_priv(netdev);
+	int err;
+
+	/* allocate transmit descriptors */
+	err = ixgb_setup_tx_resources(adapter);
+	if (err)
+		goto err_setup_tx;
+
+	netif_carrier_off(netdev);
+
+	/* allocate receive descriptors */
+
+	err = ixgb_setup_rx_resources(adapter);
+	if (err)
+		goto err_setup_rx;
+
+	err = ixgb_up(adapter);
+	if (err)
+		goto err_up;
+
+	netif_start_queue(netdev);
+
+	return 0;
+
+err_up:
+	ixgb_free_rx_resources(adapter);
+err_setup_rx:
+	ixgb_free_tx_resources(adapter);
+err_setup_tx:
+	ixgb_reset(adapter);
+
+	return err;
+}
+
+/**
+ * ixgb_close - Disables a network interface
+ * @netdev: network interface device structure
+ *
+ * Returns 0, this is not allowed to fail
+ *
+ * The close entry point is called when an interface is de-activated
+ * by the OS.  The hardware is still under the drivers control, but
+ * needs to be disabled.  A global MAC reset is issued to stop the
+ * hardware, and all transmit and receive resources are freed.
+ **/
+
+static int
+ixgb_close(struct net_device *netdev)
+{
+	struct ixgb_adapter *adapter = netdev_priv(netdev);
+
+	ixgb_down(adapter, true);
+
+	ixgb_free_tx_resources(adapter);
+	ixgb_free_rx_resources(adapter);
+
+	return 0;
+}
+
+/**
+ * ixgb_setup_tx_resources - allocate Tx resources (Descriptors)
+ * @adapter: board private structure
+ *
+ * Return 0 on success, negative on failure
+ **/
+
+int
+ixgb_setup_tx_resources(struct ixgb_adapter *adapter)
+{
+	struct ixgb_desc_ring *txdr = &adapter->tx_ring;
+	struct pci_dev *pdev = adapter->pdev;
+	int size;
+
+	size = sizeof(struct ixgb_buffer) * txdr->count;
+	txdr->buffer_info = vzalloc(size);
+	if (!txdr->buffer_info) {
+		netif_err(adapter, probe, adapter->netdev,
+			  "Unable to allocate transmit descriptor ring memory\n");
+		return -ENOMEM;
+	}
+
+	/* round up to nearest 4K */
+
+	txdr->size = txdr->count * sizeof(struct ixgb_tx_desc);
+	txdr->size = ALIGN(txdr->size, 4096);
+
+	txdr->desc = dma_alloc_coherent(&pdev->dev, txdr->size, &txdr->dma,
+					GFP_KERNEL);
+	if (!txdr->desc) {
+		vfree(txdr->buffer_info);
+		netif_err(adapter, probe, adapter->netdev,
+			  "Unable to allocate transmit descriptor memory\n");
+		return -ENOMEM;
+	}
+	memset(txdr->desc, 0, txdr->size);
+
+	txdr->next_to_use = 0;
+	txdr->next_to_clean = 0;
+
+	return 0;
+}
+
+/**
+ * ixgb_configure_tx - Configure 82597 Transmit Unit after Reset.
+ * @adapter: board private structure
+ *
+ * Configure the Tx unit of the MAC after a reset.
+ **/
+
+static void
+ixgb_configure_tx(struct ixgb_adapter *adapter)
+{
+	u64 tdba = adapter->tx_ring.dma;
+	u32 tdlen = adapter->tx_ring.count * sizeof(struct ixgb_tx_desc);
+	u32 tctl;
+	struct ixgb_hw *hw = &adapter->hw;
+
+	/* Setup the Base and Length of the Tx Descriptor Ring
+	 * tx_ring.dma can be either a 32 or 64 bit value
+	 */
+
+	IXGB_WRITE_REG(hw, TDBAL, (tdba & 0x00000000ffffffffULL));
+	IXGB_WRITE_REG(hw, TDBAH, (tdba >> 32));
+
+	IXGB_WRITE_REG(hw, TDLEN, tdlen);
+
+	/* Setup the HW Tx Head and Tail descriptor pointers */
+
+	IXGB_WRITE_REG(hw, TDH, 0);
+	IXGB_WRITE_REG(hw, TDT, 0);
+
+	/* don't set up txdctl, it induces performance problems if configured
+	 * incorrectly */
+	/* Set the Tx Interrupt Delay register */
+
+	IXGB_WRITE_REG(hw, TIDV, adapter->tx_int_delay);
+
+	/* Program the Transmit Control Register */
+
+	tctl = IXGB_TCTL_TCE | IXGB_TCTL_TXEN | IXGB_TCTL_TPDE;
+	IXGB_WRITE_REG(hw, TCTL, tctl);
+
+	/* Setup Transmit Descriptor Settings for this adapter */
+	adapter->tx_cmd_type =
+		IXGB_TX_DESC_TYPE |
+		(adapter->tx_int_delay_enable ? IXGB_TX_DESC_CMD_IDE : 0);
+}
+
+/**
+ * ixgb_setup_rx_resources - allocate Rx resources (Descriptors)
+ * @adapter: board private structure
+ *
+ * Returns 0 on success, negative on failure
+ **/
+
+int
+ixgb_setup_rx_resources(struct ixgb_adapter *adapter)
+{
+	struct ixgb_desc_ring *rxdr = &adapter->rx_ring;
+	struct pci_dev *pdev = adapter->pdev;
+	int size;
+
+	size = sizeof(struct ixgb_buffer) * rxdr->count;
+	rxdr->buffer_info = vzalloc(size);
+	if (!rxdr->buffer_info) {
+		netif_err(adapter, probe, adapter->netdev,
+			  "Unable to allocate receive descriptor ring\n");
+		return -ENOMEM;
+	}
+
+	/* Round up to nearest 4K */
+
+	rxdr->size = rxdr->count * sizeof(struct ixgb_rx_desc);
+	rxdr->size = ALIGN(rxdr->size, 4096);
+
+	rxdr->desc = dma_alloc_coherent(&pdev->dev, rxdr->size, &rxdr->dma,
+					GFP_KERNEL);
+
+	if (!rxdr->desc) {
+		vfree(rxdr->buffer_info);
+		netif_err(adapter, probe, adapter->netdev,
+			  "Unable to allocate receive descriptors\n");
+		return -ENOMEM;
+	}
+	memset(rxdr->desc, 0, rxdr->size);
+
+	rxdr->next_to_clean = 0;
+	rxdr->next_to_use = 0;
+
+	return 0;
+}
+
+/**
+ * ixgb_setup_rctl - configure the receive control register
+ * @adapter: Board private structure
+ **/
+
+static void
+ixgb_setup_rctl(struct ixgb_adapter *adapter)
+{
+	u32 rctl;
+
+	rctl = IXGB_READ_REG(&adapter->hw, RCTL);
+
+	rctl &= ~(3 << IXGB_RCTL_MO_SHIFT);
+
+	rctl |=
+		IXGB_RCTL_BAM | IXGB_RCTL_RDMTS_1_2 |
+		IXGB_RCTL_RXEN | IXGB_RCTL_CFF |
+		(adapter->hw.mc_filter_type << IXGB_RCTL_MO_SHIFT);
+
+	rctl |= IXGB_RCTL_SECRC;
+
+	if (adapter->rx_buffer_len <= IXGB_RXBUFFER_2048)
+		rctl |= IXGB_RCTL_BSIZE_2048;
+	else if (adapter->rx_buffer_len <= IXGB_RXBUFFER_4096)
+		rctl |= IXGB_RCTL_BSIZE_4096;
+	else if (adapter->rx_buffer_len <= IXGB_RXBUFFER_8192)
+		rctl |= IXGB_RCTL_BSIZE_8192;
+	else if (adapter->rx_buffer_len <= IXGB_RXBUFFER_16384)
+		rctl |= IXGB_RCTL_BSIZE_16384;
+
+	IXGB_WRITE_REG(&adapter->hw, RCTL, rctl);
+}
+
+/**
+ * ixgb_configure_rx - Configure 82597 Receive Unit after Reset.
+ * @adapter: board private structure
+ *
+ * Configure the Rx unit of the MAC after a reset.
+ **/
+
+static void
+ixgb_configure_rx(struct ixgb_adapter *adapter)
+{
+	u64 rdba = adapter->rx_ring.dma;
+	u32 rdlen = adapter->rx_ring.count * sizeof(struct ixgb_rx_desc);
+	struct ixgb_hw *hw = &adapter->hw;
+	u32 rctl;
+	u32 rxcsum;
+
+	/* make sure receives are disabled while setting up the descriptors */
+
+	rctl = IXGB_READ_REG(hw, RCTL);
+	IXGB_WRITE_REG(hw, RCTL, rctl & ~IXGB_RCTL_RXEN);
+
+	/* set the Receive Delay Timer Register */
+
+	IXGB_WRITE_REG(hw, RDTR, adapter->rx_int_delay);
+
+	/* Setup the Base and Length of the Rx Descriptor Ring */
+
+	IXGB_WRITE_REG(hw, RDBAL, (rdba & 0x00000000ffffffffULL));
+	IXGB_WRITE_REG(hw, RDBAH, (rdba >> 32));
+
+	IXGB_WRITE_REG(hw, RDLEN, rdlen);
+
+	/* Setup the HW Rx Head and Tail Descriptor Pointers */
+	IXGB_WRITE_REG(hw, RDH, 0);
+	IXGB_WRITE_REG(hw, RDT, 0);
+
+	/* due to the hardware errata with RXDCTL, we are unable to use any of
+	 * the performance enhancing features of it without causing other
+	 * subtle bugs, some of the bugs could include receive length
+	 * corruption at high data rates (WTHRESH > 0) and/or receive
+	 * descriptor ring irregularites (particularly in hardware cache) */
+	IXGB_WRITE_REG(hw, RXDCTL, 0);
+
+	/* Enable Receive Checksum Offload for TCP and UDP */
+	if (adapter->rx_csum) {
+		rxcsum = IXGB_READ_REG(hw, RXCSUM);
+		rxcsum |= IXGB_RXCSUM_TUOFL;
+		IXGB_WRITE_REG(hw, RXCSUM, rxcsum);
+	}
+
+	/* Enable Receives */
+
+	IXGB_WRITE_REG(hw, RCTL, rctl);
+}
+
+/**
+ * ixgb_free_tx_resources - Free Tx Resources
+ * @adapter: board private structure
+ *
+ * Free all transmit software resources
+ **/
+
+void
+ixgb_free_tx_resources(struct ixgb_adapter *adapter)
+{
+	struct pci_dev *pdev = adapter->pdev;
+
+	ixgb_clean_tx_ring(adapter);
+
+	vfree(adapter->tx_ring.buffer_info);
+	adapter->tx_ring.buffer_info = NULL;
+
+	dma_free_coherent(&pdev->dev, adapter->tx_ring.size,
+			  adapter->tx_ring.desc, adapter->tx_ring.dma);
+
+	adapter->tx_ring.desc = NULL;
+}
+
+static void
+ixgb_unmap_and_free_tx_resource(struct ixgb_adapter *adapter,
+                                struct ixgb_buffer *buffer_info)
+{
+	if (buffer_info->dma) {
+		if (buffer_info->mapped_as_page)
+			dma_unmap_page(&adapter->pdev->dev, buffer_info->dma,
+				       buffer_info->length, DMA_TO_DEVICE);
+		else
+			dma_unmap_single(&adapter->pdev->dev, buffer_info->dma,
+					 buffer_info->length, DMA_TO_DEVICE);
+		buffer_info->dma = 0;
+	}
+
+	if (buffer_info->skb) {
+		dev_kfree_skb_any(buffer_info->skb);
+		buffer_info->skb = NULL;
+	}
+	buffer_info->time_stamp = 0;
+	/* these fields must always be initialized in tx
+	 * buffer_info->length = 0;
+	 * buffer_info->next_to_watch = 0; */
+}
+
+/**
+ * ixgb_clean_tx_ring - Free Tx Buffers
+ * @adapter: board private structure
+ **/
+
+static void
+ixgb_clean_tx_ring(struct ixgb_adapter *adapter)
+{
+	struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
+	struct ixgb_buffer *buffer_info;
+	unsigned long size;
+	unsigned int i;
+
+	/* Free all the Tx ring sk_buffs */
+
+	for (i = 0; i < tx_ring->count; i++) {
+		buffer_info = &tx_ring->buffer_info[i];
+		ixgb_unmap_and_free_tx_resource(adapter, buffer_info);
+	}
+
+	size = sizeof(struct ixgb_buffer) * tx_ring->count;
+	memset(tx_ring->buffer_info, 0, size);
+
+	/* Zero out the descriptor ring */
+
+	memset(tx_ring->desc, 0, tx_ring->size);
+
+	tx_ring->next_to_use = 0;
+	tx_ring->next_to_clean = 0;
+
+	IXGB_WRITE_REG(&adapter->hw, TDH, 0);
+	IXGB_WRITE_REG(&adapter->hw, TDT, 0);
+}
+
+/**
+ * ixgb_free_rx_resources - Free Rx Resources
+ * @adapter: board private structure
+ *
+ * Free all receive software resources
+ **/
+
+void
+ixgb_free_rx_resources(struct ixgb_adapter *adapter)
+{
+	struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
+	struct pci_dev *pdev = adapter->pdev;
+
+	ixgb_clean_rx_ring(adapter);
+
+	vfree(rx_ring->buffer_info);
+	rx_ring->buffer_info = NULL;
+
+	dma_free_coherent(&pdev->dev, rx_ring->size, rx_ring->desc,
+			  rx_ring->dma);
+
+	rx_ring->desc = NULL;
+}
+
+/**
+ * ixgb_clean_rx_ring - Free Rx Buffers
+ * @adapter: board private structure
+ **/
+
+static void
+ixgb_clean_rx_ring(struct ixgb_adapter *adapter)
+{
+	struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
+	struct ixgb_buffer *buffer_info;
+	struct pci_dev *pdev = adapter->pdev;
+	unsigned long size;
+	unsigned int i;
+
+	/* Free all the Rx ring sk_buffs */
+
+	for (i = 0; i < rx_ring->count; i++) {
+		buffer_info = &rx_ring->buffer_info[i];
+		if (buffer_info->dma) {
+			dma_unmap_single(&pdev->dev,
+					 buffer_info->dma,
+					 buffer_info->length,
+					 DMA_FROM_DEVICE);
+			buffer_info->dma = 0;
+			buffer_info->length = 0;
+		}
+
+		if (buffer_info->skb) {
+			dev_kfree_skb(buffer_info->skb);
+			buffer_info->skb = NULL;
+		}
+	}
+
+	size = sizeof(struct ixgb_buffer) * rx_ring->count;
+	memset(rx_ring->buffer_info, 0, size);
+
+	/* Zero out the descriptor ring */
+
+	memset(rx_ring->desc, 0, rx_ring->size);
+
+	rx_ring->next_to_clean = 0;
+	rx_ring->next_to_use = 0;
+
+	IXGB_WRITE_REG(&adapter->hw, RDH, 0);
+	IXGB_WRITE_REG(&adapter->hw, RDT, 0);
+}
+
+/**
+ * ixgb_set_mac - Change the Ethernet Address of the NIC
+ * @netdev: network interface device structure
+ * @p: pointer to an address structure
+ *
+ * Returns 0 on success, negative on failure
+ **/
+
+static int
+ixgb_set_mac(struct net_device *netdev, void *p)
+{
+	struct ixgb_adapter *adapter = netdev_priv(netdev);
+	struct sockaddr *addr = p;
+
+	if (!is_valid_ether_addr(addr->sa_data))
+		return -EADDRNOTAVAIL;
+
+	memcpy(netdev->dev_addr, addr->sa_data, netdev->addr_len);
+
+	ixgb_rar_set(&adapter->hw, addr->sa_data, 0);
+
+	return 0;
+}
+
+/**
+ * ixgb_set_multi - Multicast and Promiscuous mode set
+ * @netdev: network interface device structure
+ *
+ * The set_multi entry point is called whenever the multicast address
+ * list or the network interface flags are updated.  This routine is
+ * responsible for configuring the hardware for proper multicast,
+ * promiscuous mode, and all-multi behavior.
+ **/
+
+static void
+ixgb_set_multi(struct net_device *netdev)
+{
+	struct ixgb_adapter *adapter = netdev_priv(netdev);
+	struct ixgb_hw *hw = &adapter->hw;
+	struct netdev_hw_addr *ha;
+	u32 rctl;
+	int i;
+
+	/* Check for Promiscuous and All Multicast modes */
+
+	rctl = IXGB_READ_REG(hw, RCTL);
+
+	if (netdev->flags & IFF_PROMISC) {
+		rctl |= (IXGB_RCTL_UPE | IXGB_RCTL_MPE);
+		/* disable VLAN filtering */
+		rctl &= ~IXGB_RCTL_CFIEN;
+		rctl &= ~IXGB_RCTL_VFE;
+	} else {
+		if (netdev->flags & IFF_ALLMULTI) {
+			rctl |= IXGB_RCTL_MPE;
+			rctl &= ~IXGB_RCTL_UPE;
+		} else {
+			rctl &= ~(IXGB_RCTL_UPE | IXGB_RCTL_MPE);
+		}
+		/* enable VLAN filtering */
+		rctl |= IXGB_RCTL_VFE;
+		rctl &= ~IXGB_RCTL_CFIEN;
+	}
+
+	if (netdev_mc_count(netdev) > IXGB_MAX_NUM_MULTICAST_ADDRESSES) {
+		rctl |= IXGB_RCTL_MPE;
+		IXGB_WRITE_REG(hw, RCTL, rctl);
+	} else {
+		u8 mta[IXGB_MAX_NUM_MULTICAST_ADDRESSES *
+			    IXGB_ETH_LENGTH_OF_ADDRESS];
+
+		IXGB_WRITE_REG(hw, RCTL, rctl);
+
+		i = 0;
+		netdev_for_each_mc_addr(ha, netdev)
+			memcpy(&mta[i++ * IXGB_ETH_LENGTH_OF_ADDRESS],
+			       ha->addr, IXGB_ETH_LENGTH_OF_ADDRESS);
+
+		ixgb_mc_addr_list_update(hw, mta, netdev_mc_count(netdev), 0);
+	}
+
+	if (netdev->features & NETIF_F_HW_VLAN_RX)
+		ixgb_vlan_strip_enable(adapter);
+	else
+		ixgb_vlan_strip_disable(adapter);
+
+}
+
+/**
+ * ixgb_watchdog - Timer Call-back
+ * @data: pointer to netdev cast into an unsigned long
+ **/
+
+static void
+ixgb_watchdog(unsigned long data)
+{
+	struct ixgb_adapter *adapter = (struct ixgb_adapter *)data;
+	struct net_device *netdev = adapter->netdev;
+	struct ixgb_desc_ring *txdr = &adapter->tx_ring;
+
+	ixgb_check_for_link(&adapter->hw);
+
+	if (ixgb_check_for_bad_link(&adapter->hw)) {
+		/* force the reset path */
+		netif_stop_queue(netdev);
+	}
+
+	if (adapter->hw.link_up) {
+		if (!netif_carrier_ok(netdev)) {
+			netdev_info(netdev,
+				    "NIC Link is Up 10 Gbps Full Duplex, Flow Control: %s\n",
+				    (adapter->hw.fc.type == ixgb_fc_full) ?
+				    "RX/TX" :
+				    (adapter->hw.fc.type == ixgb_fc_rx_pause) ?
+				     "RX" :
+				    (adapter->hw.fc.type == ixgb_fc_tx_pause) ?
+				    "TX" : "None");
+			adapter->link_speed = 10000;
+			adapter->link_duplex = FULL_DUPLEX;
+			netif_carrier_on(netdev);
+		}
+	} else {
+		if (netif_carrier_ok(netdev)) {
+			adapter->link_speed = 0;
+			adapter->link_duplex = 0;
+			netdev_info(netdev, "NIC Link is Down\n");
+			netif_carrier_off(netdev);
+		}
+	}
+
+	ixgb_update_stats(adapter);
+
+	if (!netif_carrier_ok(netdev)) {
+		if (IXGB_DESC_UNUSED(txdr) + 1 < txdr->count) {
+			/* We've lost link, so the controller stops DMA,
+			 * but we've got queued Tx work that's never going
+			 * to get done, so reset controller to flush Tx.
+			 * (Do the reset outside of interrupt context). */
+			schedule_work(&adapter->tx_timeout_task);
+			/* return immediately since reset is imminent */
+			return;
+		}
+	}
+
+	/* Force detection of hung controller every watchdog period */
+	adapter->detect_tx_hung = true;
+
+	/* generate an interrupt to force clean up of any stragglers */
+	IXGB_WRITE_REG(&adapter->hw, ICS, IXGB_INT_TXDW);
+
+	/* Reset the timer */
+	mod_timer(&adapter->watchdog_timer, jiffies + 2 * HZ);
+}
+
+#define IXGB_TX_FLAGS_CSUM		0x00000001
+#define IXGB_TX_FLAGS_VLAN		0x00000002
+#define IXGB_TX_FLAGS_TSO		0x00000004
+
+static int
+ixgb_tso(struct ixgb_adapter *adapter, struct sk_buff *skb)
+{
+	struct ixgb_context_desc *context_desc;
+	unsigned int i;
+	u8 ipcss, ipcso, tucss, tucso, hdr_len;
+	u16 ipcse, tucse, mss;
+	int err;
+
+	if (likely(skb_is_gso(skb))) {
+		struct ixgb_buffer *buffer_info;
+		struct iphdr *iph;
+
+		if (skb_header_cloned(skb)) {
+			err = pskb_expand_head(skb, 0, 0, GFP_ATOMIC);
+			if (err)
+				return err;
+		}
+
+		hdr_len = skb_transport_offset(skb) + tcp_hdrlen(skb);
+		mss = skb_shinfo(skb)->gso_size;
+		iph = ip_hdr(skb);
+		iph->tot_len = 0;
+		iph->check = 0;
+		tcp_hdr(skb)->check = ~csum_tcpudp_magic(iph->saddr,
+							 iph->daddr, 0,
+							 IPPROTO_TCP, 0);
+		ipcss = skb_network_offset(skb);
+		ipcso = (void *)&(iph->check) - (void *)skb->data;
+		ipcse = skb_transport_offset(skb) - 1;
+		tucss = skb_transport_offset(skb);
+		tucso = (void *)&(tcp_hdr(skb)->check) - (void *)skb->data;
+		tucse = 0;
+
+		i = adapter->tx_ring.next_to_use;
+		context_desc = IXGB_CONTEXT_DESC(adapter->tx_ring, i);
+		buffer_info = &adapter->tx_ring.buffer_info[i];
+		WARN_ON(buffer_info->dma != 0);
+
+		context_desc->ipcss = ipcss;
+		context_desc->ipcso = ipcso;
+		context_desc->ipcse = cpu_to_le16(ipcse);
+		context_desc->tucss = tucss;
+		context_desc->tucso = tucso;
+		context_desc->tucse = cpu_to_le16(tucse);
+		context_desc->mss = cpu_to_le16(mss);
+		context_desc->hdr_len = hdr_len;
+		context_desc->status = 0;
+		context_desc->cmd_type_len = cpu_to_le32(
+						  IXGB_CONTEXT_DESC_TYPE
+						| IXGB_CONTEXT_DESC_CMD_TSE
+						| IXGB_CONTEXT_DESC_CMD_IP
+						| IXGB_CONTEXT_DESC_CMD_TCP
+						| IXGB_CONTEXT_DESC_CMD_IDE
+						| (skb->len - (hdr_len)));
+
+
+		if (++i == adapter->tx_ring.count) i = 0;
+		adapter->tx_ring.next_to_use = i;
+
+		return 1;
+	}
+
+	return 0;
+}
+
+static bool
+ixgb_tx_csum(struct ixgb_adapter *adapter, struct sk_buff *skb)
+{
+	struct ixgb_context_desc *context_desc;
+	unsigned int i;
+	u8 css, cso;
+
+	if (likely(skb->ip_summed == CHECKSUM_PARTIAL)) {
+		struct ixgb_buffer *buffer_info;
+		css = skb_checksum_start_offset(skb);
+		cso = css + skb->csum_offset;
+
+		i = adapter->tx_ring.next_to_use;
+		context_desc = IXGB_CONTEXT_DESC(adapter->tx_ring, i);
+		buffer_info = &adapter->tx_ring.buffer_info[i];
+		WARN_ON(buffer_info->dma != 0);
+
+		context_desc->tucss = css;
+		context_desc->tucso = cso;
+		context_desc->tucse = 0;
+		/* zero out any previously existing data in one instruction */
+		*(u32 *)&(context_desc->ipcss) = 0;
+		context_desc->status = 0;
+		context_desc->hdr_len = 0;
+		context_desc->mss = 0;
+		context_desc->cmd_type_len =
+			cpu_to_le32(IXGB_CONTEXT_DESC_TYPE
+				    | IXGB_TX_DESC_CMD_IDE);
+
+		if (++i == adapter->tx_ring.count) i = 0;
+		adapter->tx_ring.next_to_use = i;
+
+		return true;
+	}
+
+	return false;
+}
+
+#define IXGB_MAX_TXD_PWR	14
+#define IXGB_MAX_DATA_PER_TXD	(1<<IXGB_MAX_TXD_PWR)
+
+static int
+ixgb_tx_map(struct ixgb_adapter *adapter, struct sk_buff *skb,
+	    unsigned int first)
+{
+	struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
+	struct pci_dev *pdev = adapter->pdev;
+	struct ixgb_buffer *buffer_info;
+	int len = skb_headlen(skb);
+	unsigned int offset = 0, size, count = 0, i;
+	unsigned int mss = skb_shinfo(skb)->gso_size;
+	unsigned int nr_frags = skb_shinfo(skb)->nr_frags;
+	unsigned int f;
+
+	i = tx_ring->next_to_use;
+
+	while (len) {
+		buffer_info = &tx_ring->buffer_info[i];
+		size = min(len, IXGB_MAX_DATA_PER_TXD);
+		/* Workaround for premature desc write-backs
+		 * in TSO mode.  Append 4-byte sentinel desc */
+		if (unlikely(mss && !nr_frags && size == len && size > 8))
+			size -= 4;
+
+		buffer_info->length = size;
+		WARN_ON(buffer_info->dma != 0);
+		buffer_info->time_stamp = jiffies;
+		buffer_info->mapped_as_page = false;
+		buffer_info->dma = dma_map_single(&pdev->dev,
+						  skb->data + offset,
+						  size, DMA_TO_DEVICE);
+		if (dma_mapping_error(&pdev->dev, buffer_info->dma))
+			goto dma_error;
+		buffer_info->next_to_watch = 0;
+
+		len -= size;
+		offset += size;
+		count++;
+		if (len) {
+			i++;
+			if (i == tx_ring->count)
+				i = 0;
+		}
+	}
+
+	for (f = 0; f < nr_frags; f++) {
+		struct skb_frag_struct *frag;
+
+		frag = &skb_shinfo(skb)->frags[f];
+		len = frag->size;
+		offset = frag->page_offset;
+
+		while (len) {
+			i++;
+			if (i == tx_ring->count)
+				i = 0;
+
+			buffer_info = &tx_ring->buffer_info[i];
+			size = min(len, IXGB_MAX_DATA_PER_TXD);
+
+			/* Workaround for premature desc write-backs
+			 * in TSO mode.  Append 4-byte sentinel desc */
+			if (unlikely(mss && (f == (nr_frags - 1))
+				     && size == len && size > 8))
+				size -= 4;
+
+			buffer_info->length = size;
+			buffer_info->time_stamp = jiffies;
+			buffer_info->mapped_as_page = true;
+			buffer_info->dma =
+				dma_map_page(&pdev->dev, frag->page,
+					     offset, size, DMA_TO_DEVICE);
+			if (dma_mapping_error(&pdev->dev, buffer_info->dma))
+				goto dma_error;
+			buffer_info->next_to_watch = 0;
+
+			len -= size;
+			offset += size;
+			count++;
+		}
+	}
+	tx_ring->buffer_info[i].skb = skb;
+	tx_ring->buffer_info[first].next_to_watch = i;
+
+	return count;
+
+dma_error:
+	dev_err(&pdev->dev, "TX DMA map failed\n");
+	buffer_info->dma = 0;
+	if (count)
+		count--;
+
+	while (count--) {
+		if (i==0)
+			i += tx_ring->count;
+		i--;
+		buffer_info = &tx_ring->buffer_info[i];
+		ixgb_unmap_and_free_tx_resource(adapter, buffer_info);
+	}
+
+	return 0;
+}
+
+static void
+ixgb_tx_queue(struct ixgb_adapter *adapter, int count, int vlan_id,int tx_flags)
+{
+	struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
+	struct ixgb_tx_desc *tx_desc = NULL;
+	struct ixgb_buffer *buffer_info;
+	u32 cmd_type_len = adapter->tx_cmd_type;
+	u8 status = 0;
+	u8 popts = 0;
+	unsigned int i;
+
+	if (tx_flags & IXGB_TX_FLAGS_TSO) {
+		cmd_type_len |= IXGB_TX_DESC_CMD_TSE;
+		popts |= (IXGB_TX_DESC_POPTS_IXSM | IXGB_TX_DESC_POPTS_TXSM);
+	}
+
+	if (tx_flags & IXGB_TX_FLAGS_CSUM)
+		popts |= IXGB_TX_DESC_POPTS_TXSM;
+
+	if (tx_flags & IXGB_TX_FLAGS_VLAN)
+		cmd_type_len |= IXGB_TX_DESC_CMD_VLE;
+
+	i = tx_ring->next_to_use;
+
+	while (count--) {
+		buffer_info = &tx_ring->buffer_info[i];
+		tx_desc = IXGB_TX_DESC(*tx_ring, i);
+		tx_desc->buff_addr = cpu_to_le64(buffer_info->dma);
+		tx_desc->cmd_type_len =
+			cpu_to_le32(cmd_type_len | buffer_info->length);
+		tx_desc->status = status;
+		tx_desc->popts = popts;
+		tx_desc->vlan = cpu_to_le16(vlan_id);
+
+		if (++i == tx_ring->count) i = 0;
+	}
+
+	tx_desc->cmd_type_len |=
+		cpu_to_le32(IXGB_TX_DESC_CMD_EOP | IXGB_TX_DESC_CMD_RS);
+
+	/* Force memory writes to complete before letting h/w
+	 * know there are new descriptors to fetch.  (Only
+	 * applicable for weak-ordered memory model archs,
+	 * such as IA-64). */
+	wmb();
+
+	tx_ring->next_to_use = i;
+	IXGB_WRITE_REG(&adapter->hw, TDT, i);
+}
+
+static int __ixgb_maybe_stop_tx(struct net_device *netdev, int size)
+{
+	struct ixgb_adapter *adapter = netdev_priv(netdev);
+	struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
+
+	netif_stop_queue(netdev);
+	/* Herbert's original patch had:
+	 *  smp_mb__after_netif_stop_queue();
+	 * but since that doesn't exist yet, just open code it. */
+	smp_mb();
+
+	/* We need to check again in a case another CPU has just
+	 * made room available. */
+	if (likely(IXGB_DESC_UNUSED(tx_ring) < size))
+		return -EBUSY;
+
+	/* A reprieve! */
+	netif_start_queue(netdev);
+	++adapter->restart_queue;
+	return 0;
+}
+
+static int ixgb_maybe_stop_tx(struct net_device *netdev,
+                              struct ixgb_desc_ring *tx_ring, int size)
+{
+	if (likely(IXGB_DESC_UNUSED(tx_ring) >= size))
+		return 0;
+	return __ixgb_maybe_stop_tx(netdev, size);
+}
+
+
+/* Tx Descriptors needed, worst case */
+#define TXD_USE_COUNT(S) (((S) >> IXGB_MAX_TXD_PWR) + \
+			 (((S) & (IXGB_MAX_DATA_PER_TXD - 1)) ? 1 : 0))
+#define DESC_NEEDED TXD_USE_COUNT(IXGB_MAX_DATA_PER_TXD) /* skb->date */ + \
+	MAX_SKB_FRAGS * TXD_USE_COUNT(PAGE_SIZE) + 1 /* for context */ \
+	+ 1 /* one more needed for sentinel TSO workaround */
+
+static netdev_tx_t
+ixgb_xmit_frame(struct sk_buff *skb, struct net_device *netdev)
+{
+	struct ixgb_adapter *adapter = netdev_priv(netdev);
+	unsigned int first;
+	unsigned int tx_flags = 0;
+	int vlan_id = 0;
+	int count = 0;
+	int tso;
+
+	if (test_bit(__IXGB_DOWN, &adapter->flags)) {
+		dev_kfree_skb(skb);
+		return NETDEV_TX_OK;
+	}
+
+	if (skb->len <= 0) {
+		dev_kfree_skb(skb);
+		return NETDEV_TX_OK;
+	}
+
+	if (unlikely(ixgb_maybe_stop_tx(netdev, &adapter->tx_ring,
+                     DESC_NEEDED)))
+		return NETDEV_TX_BUSY;
+
+	if (vlan_tx_tag_present(skb)) {
+		tx_flags |= IXGB_TX_FLAGS_VLAN;
+		vlan_id = vlan_tx_tag_get(skb);
+	}
+
+	first = adapter->tx_ring.next_to_use;
+
+	tso = ixgb_tso(adapter, skb);
+	if (tso < 0) {
+		dev_kfree_skb(skb);
+		return NETDEV_TX_OK;
+	}
+
+	if (likely(tso))
+		tx_flags |= IXGB_TX_FLAGS_TSO;
+	else if (ixgb_tx_csum(adapter, skb))
+		tx_flags |= IXGB_TX_FLAGS_CSUM;
+
+	count = ixgb_tx_map(adapter, skb, first);
+
+	if (count) {
+		ixgb_tx_queue(adapter, count, vlan_id, tx_flags);
+		/* Make sure there is space in the ring for the next send. */
+		ixgb_maybe_stop_tx(netdev, &adapter->tx_ring, DESC_NEEDED);
+
+	} else {
+		dev_kfree_skb_any(skb);
+		adapter->tx_ring.buffer_info[first].time_stamp = 0;
+		adapter->tx_ring.next_to_use = first;
+	}
+
+	return NETDEV_TX_OK;
+}
+
+/**
+ * ixgb_tx_timeout - Respond to a Tx Hang
+ * @netdev: network interface device structure
+ **/
+
+static void
+ixgb_tx_timeout(struct net_device *netdev)
+{
+	struct ixgb_adapter *adapter = netdev_priv(netdev);
+
+	/* Do the reset outside of interrupt context */
+	schedule_work(&adapter->tx_timeout_task);
+}
+
+static void
+ixgb_tx_timeout_task(struct work_struct *work)
+{
+	struct ixgb_adapter *adapter =
+		container_of(work, struct ixgb_adapter, tx_timeout_task);
+
+	adapter->tx_timeout_count++;
+	ixgb_down(adapter, true);
+	ixgb_up(adapter);
+}
+
+/**
+ * ixgb_get_stats - Get System Network Statistics
+ * @netdev: network interface device structure
+ *
+ * Returns the address of the device statistics structure.
+ * The statistics are actually updated from the timer callback.
+ **/
+
+static struct net_device_stats *
+ixgb_get_stats(struct net_device *netdev)
+{
+	return &netdev->stats;
+}
+
+/**
+ * ixgb_change_mtu - Change the Maximum Transfer Unit
+ * @netdev: network interface device structure
+ * @new_mtu: new value for maximum frame size
+ *
+ * Returns 0 on success, negative on failure
+ **/
+
+static int
+ixgb_change_mtu(struct net_device *netdev, int new_mtu)
+{
+	struct ixgb_adapter *adapter = netdev_priv(netdev);
+	int max_frame = new_mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;
+	int old_max_frame = netdev->mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;
+
+	/* MTU < 68 is an error for IPv4 traffic, just don't allow it */
+	if ((new_mtu < 68) ||
+	    (max_frame > IXGB_MAX_JUMBO_FRAME_SIZE + ENET_FCS_LENGTH)) {
+		netif_err(adapter, probe, adapter->netdev,
+			  "Invalid MTU setting %d\n", new_mtu);
+		return -EINVAL;
+	}
+
+	if (old_max_frame == max_frame)
+		return 0;
+
+	if (netif_running(netdev))
+		ixgb_down(adapter, true);
+
+	adapter->rx_buffer_len = max_frame + 8; /* + 8 for errata */
+
+	netdev->mtu = new_mtu;
+
+	if (netif_running(netdev))
+		ixgb_up(adapter);
+
+	return 0;
+}
+
+/**
+ * ixgb_update_stats - Update the board statistics counters.
+ * @adapter: board private structure
+ **/
+
+void
+ixgb_update_stats(struct ixgb_adapter *adapter)
+{
+	struct net_device *netdev = adapter->netdev;
+	struct pci_dev *pdev = adapter->pdev;
+
+	/* Prevent stats update while adapter is being reset */
+	if (pci_channel_offline(pdev))
+		return;
+
+	if ((netdev->flags & IFF_PROMISC) || (netdev->flags & IFF_ALLMULTI) ||
+	   (netdev_mc_count(netdev) > IXGB_MAX_NUM_MULTICAST_ADDRESSES)) {
+		u64 multi = IXGB_READ_REG(&adapter->hw, MPRCL);
+		u32 bcast_l = IXGB_READ_REG(&adapter->hw, BPRCL);
+		u32 bcast_h = IXGB_READ_REG(&adapter->hw, BPRCH);
+		u64 bcast = ((u64)bcast_h << 32) | bcast_l;
+
+		multi |= ((u64)IXGB_READ_REG(&adapter->hw, MPRCH) << 32);
+		/* fix up multicast stats by removing broadcasts */
+		if (multi >= bcast)
+			multi -= bcast;
+
+		adapter->stats.mprcl += (multi & 0xFFFFFFFF);
+		adapter->stats.mprch += (multi >> 32);
+		adapter->stats.bprcl += bcast_l;
+		adapter->stats.bprch += bcast_h;
+	} else {
+		adapter->stats.mprcl += IXGB_READ_REG(&adapter->hw, MPRCL);
+		adapter->stats.mprch += IXGB_READ_REG(&adapter->hw, MPRCH);
+		adapter->stats.bprcl += IXGB_READ_REG(&adapter->hw, BPRCL);
+		adapter->stats.bprch += IXGB_READ_REG(&adapter->hw, BPRCH);
+	}
+	adapter->stats.tprl += IXGB_READ_REG(&adapter->hw, TPRL);
+	adapter->stats.tprh += IXGB_READ_REG(&adapter->hw, TPRH);
+	adapter->stats.gprcl += IXGB_READ_REG(&adapter->hw, GPRCL);
+	adapter->stats.gprch += IXGB_READ_REG(&adapter->hw, GPRCH);
+	adapter->stats.uprcl += IXGB_READ_REG(&adapter->hw, UPRCL);
+	adapter->stats.uprch += IXGB_READ_REG(&adapter->hw, UPRCH);
+	adapter->stats.vprcl += IXGB_READ_REG(&adapter->hw, VPRCL);
+	adapter->stats.vprch += IXGB_READ_REG(&adapter->hw, VPRCH);
+	adapter->stats.jprcl += IXGB_READ_REG(&adapter->hw, JPRCL);
+	adapter->stats.jprch += IXGB_READ_REG(&adapter->hw, JPRCH);
+	adapter->stats.gorcl += IXGB_READ_REG(&adapter->hw, GORCL);
+	adapter->stats.gorch += IXGB_READ_REG(&adapter->hw, GORCH);
+	adapter->stats.torl += IXGB_READ_REG(&adapter->hw, TORL);
+	adapter->stats.torh += IXGB_READ_REG(&adapter->hw, TORH);
+	adapter->stats.rnbc += IXGB_READ_REG(&adapter->hw, RNBC);
+	adapter->stats.ruc += IXGB_READ_REG(&adapter->hw, RUC);
+	adapter->stats.roc += IXGB_READ_REG(&adapter->hw, ROC);
+	adapter->stats.rlec += IXGB_READ_REG(&adapter->hw, RLEC);
+	adapter->stats.crcerrs += IXGB_READ_REG(&adapter->hw, CRCERRS);
+	adapter->stats.icbc += IXGB_READ_REG(&adapter->hw, ICBC);
+	adapter->stats.ecbc += IXGB_READ_REG(&adapter->hw, ECBC);
+	adapter->stats.mpc += IXGB_READ_REG(&adapter->hw, MPC);
+	adapter->stats.tptl += IXGB_READ_REG(&adapter->hw, TPTL);
+	adapter->stats.tpth += IXGB_READ_REG(&adapter->hw, TPTH);
+	adapter->stats.gptcl += IXGB_READ_REG(&adapter->hw, GPTCL);
+	adapter->stats.gptch += IXGB_READ_REG(&adapter->hw, GPTCH);
+	adapter->stats.bptcl += IXGB_READ_REG(&adapter->hw, BPTCL);
+	adapter->stats.bptch += IXGB_READ_REG(&adapter->hw, BPTCH);
+	adapter->stats.mptcl += IXGB_READ_REG(&adapter->hw, MPTCL);
+	adapter->stats.mptch += IXGB_READ_REG(&adapter->hw, MPTCH);
+	adapter->stats.uptcl += IXGB_READ_REG(&adapter->hw, UPTCL);
+	adapter->stats.uptch += IXGB_READ_REG(&adapter->hw, UPTCH);
+	adapter->stats.vptcl += IXGB_READ_REG(&adapter->hw, VPTCL);
+	adapter->stats.vptch += IXGB_READ_REG(&adapter->hw, VPTCH);
+	adapter->stats.jptcl += IXGB_READ_REG(&adapter->hw, JPTCL);
+	adapter->stats.jptch += IXGB_READ_REG(&adapter->hw, JPTCH);
+	adapter->stats.gotcl += IXGB_READ_REG(&adapter->hw, GOTCL);
+	adapter->stats.gotch += IXGB_READ_REG(&adapter->hw, GOTCH);
+	adapter->stats.totl += IXGB_READ_REG(&adapter->hw, TOTL);
+	adapter->stats.toth += IXGB_READ_REG(&adapter->hw, TOTH);
+	adapter->stats.dc += IXGB_READ_REG(&adapter->hw, DC);
+	adapter->stats.plt64c += IXGB_READ_REG(&adapter->hw, PLT64C);
+	adapter->stats.tsctc += IXGB_READ_REG(&adapter->hw, TSCTC);
+	adapter->stats.tsctfc += IXGB_READ_REG(&adapter->hw, TSCTFC);
+	adapter->stats.ibic += IXGB_READ_REG(&adapter->hw, IBIC);
+	adapter->stats.rfc += IXGB_READ_REG(&adapter->hw, RFC);
+	adapter->stats.lfc += IXGB_READ_REG(&adapter->hw, LFC);
+	adapter->stats.pfrc += IXGB_READ_REG(&adapter->hw, PFRC);
+	adapter->stats.pftc += IXGB_READ_REG(&adapter->hw, PFTC);
+	adapter->stats.mcfrc += IXGB_READ_REG(&adapter->hw, MCFRC);
+	adapter->stats.mcftc += IXGB_READ_REG(&adapter->hw, MCFTC);
+	adapter->stats.xonrxc += IXGB_READ_REG(&adapter->hw, XONRXC);
+	adapter->stats.xontxc += IXGB_READ_REG(&adapter->hw, XONTXC);
+	adapter->stats.xoffrxc += IXGB_READ_REG(&adapter->hw, XOFFRXC);
+	adapter->stats.xofftxc += IXGB_READ_REG(&adapter->hw, XOFFTXC);
+	adapter->stats.rjc += IXGB_READ_REG(&adapter->hw, RJC);
+
+	/* Fill out the OS statistics structure */
+
+	netdev->stats.rx_packets = adapter->stats.gprcl;
+	netdev->stats.tx_packets = adapter->stats.gptcl;
+	netdev->stats.rx_bytes = adapter->stats.gorcl;
+	netdev->stats.tx_bytes = adapter->stats.gotcl;
+	netdev->stats.multicast = adapter->stats.mprcl;
+	netdev->stats.collisions = 0;
+
+	/* ignore RLEC as it reports errors for padded (<64bytes) frames
+	 * with a length in the type/len field */
+	netdev->stats.rx_errors =
+	    /* adapter->stats.rnbc + */ adapter->stats.crcerrs +
+	    adapter->stats.ruc +
+	    adapter->stats.roc /*+ adapter->stats.rlec */  +
+	    adapter->stats.icbc +
+	    adapter->stats.ecbc + adapter->stats.mpc;
+
+	/* see above
+	 * netdev->stats.rx_length_errors = adapter->stats.rlec;
+	 */
+
+	netdev->stats.rx_crc_errors = adapter->stats.crcerrs;
+	netdev->stats.rx_fifo_errors = adapter->stats.mpc;
+	netdev->stats.rx_missed_errors = adapter->stats.mpc;
+	netdev->stats.rx_over_errors = adapter->stats.mpc;
+
+	netdev->stats.tx_errors = 0;
+	netdev->stats.rx_frame_errors = 0;
+	netdev->stats.tx_aborted_errors = 0;
+	netdev->stats.tx_carrier_errors = 0;
+	netdev->stats.tx_fifo_errors = 0;
+	netdev->stats.tx_heartbeat_errors = 0;
+	netdev->stats.tx_window_errors = 0;
+}
+
+#define IXGB_MAX_INTR 10
+/**
+ * ixgb_intr - Interrupt Handler
+ * @irq: interrupt number
+ * @data: pointer to a network interface device structure
+ **/
+
+static irqreturn_t
+ixgb_intr(int irq, void *data)
+{
+	struct net_device *netdev = data;
+	struct ixgb_adapter *adapter = netdev_priv(netdev);
+	struct ixgb_hw *hw = &adapter->hw;
+	u32 icr = IXGB_READ_REG(hw, ICR);
+
+	if (unlikely(!icr))
+		return IRQ_NONE;  /* Not our interrupt */
+
+	if (unlikely(icr & (IXGB_INT_RXSEQ | IXGB_INT_LSC)))
+		if (!test_bit(__IXGB_DOWN, &adapter->flags))
+			mod_timer(&adapter->watchdog_timer, jiffies);
+
+	if (napi_schedule_prep(&adapter->napi)) {
+
+		/* Disable interrupts and register for poll. The flush
+		  of the posted write is intentionally left out.
+		*/
+
+		IXGB_WRITE_REG(&adapter->hw, IMC, ~0);
+		__napi_schedule(&adapter->napi);
+	}
+	return IRQ_HANDLED;
+}
+
+/**
+ * ixgb_clean - NAPI Rx polling callback
+ * @adapter: board private structure
+ **/
+
+static int
+ixgb_clean(struct napi_struct *napi, int budget)
+{
+	struct ixgb_adapter *adapter = container_of(napi, struct ixgb_adapter, napi);
+	int work_done = 0;
+
+	ixgb_clean_tx_irq(adapter);
+	ixgb_clean_rx_irq(adapter, &work_done, budget);
+
+	/* If budget not fully consumed, exit the polling mode */
+	if (work_done < budget) {
+		napi_complete(napi);
+		if (!test_bit(__IXGB_DOWN, &adapter->flags))
+			ixgb_irq_enable(adapter);
+	}
+
+	return work_done;
+}
+
+/**
+ * ixgb_clean_tx_irq - Reclaim resources after transmit completes
+ * @adapter: board private structure
+ **/
+
+static bool
+ixgb_clean_tx_irq(struct ixgb_adapter *adapter)
+{
+	struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
+	struct net_device *netdev = adapter->netdev;
+	struct ixgb_tx_desc *tx_desc, *eop_desc;
+	struct ixgb_buffer *buffer_info;
+	unsigned int i, eop;
+	bool cleaned = false;
+
+	i = tx_ring->next_to_clean;
+	eop = tx_ring->buffer_info[i].next_to_watch;
+	eop_desc = IXGB_TX_DESC(*tx_ring, eop);
+
+	while (eop_desc->status & IXGB_TX_DESC_STATUS_DD) {
+
+		rmb(); /* read buffer_info after eop_desc */
+		for (cleaned = false; !cleaned; ) {
+			tx_desc = IXGB_TX_DESC(*tx_ring, i);
+			buffer_info = &tx_ring->buffer_info[i];
+
+			if (tx_desc->popts &
+			   (IXGB_TX_DESC_POPTS_TXSM |
+			    IXGB_TX_DESC_POPTS_IXSM))
+				adapter->hw_csum_tx_good++;
+
+			ixgb_unmap_and_free_tx_resource(adapter, buffer_info);
+
+			*(u32 *)&(tx_desc->status) = 0;
+
+			cleaned = (i == eop);
+			if (++i == tx_ring->count) i = 0;
+		}
+
+		eop = tx_ring->buffer_info[i].next_to_watch;
+		eop_desc = IXGB_TX_DESC(*tx_ring, eop);
+	}
+
+	tx_ring->next_to_clean = i;
+
+	if (unlikely(cleaned && netif_carrier_ok(netdev) &&
+		     IXGB_DESC_UNUSED(tx_ring) >= DESC_NEEDED)) {
+		/* Make sure that anybody stopping the queue after this
+		 * sees the new next_to_clean. */
+		smp_mb();
+
+		if (netif_queue_stopped(netdev) &&
+		    !(test_bit(__IXGB_DOWN, &adapter->flags))) {
+			netif_wake_queue(netdev);
+			++adapter->restart_queue;
+		}
+	}
+
+	if (adapter->detect_tx_hung) {
+		/* detect a transmit hang in hardware, this serializes the
+		 * check with the clearing of time_stamp and movement of i */
+		adapter->detect_tx_hung = false;
+		if (tx_ring->buffer_info[eop].time_stamp &&
+		   time_after(jiffies, tx_ring->buffer_info[eop].time_stamp + HZ)
+		   && !(IXGB_READ_REG(&adapter->hw, STATUS) &
+		        IXGB_STATUS_TXOFF)) {
+			/* detected Tx unit hang */
+			netif_err(adapter, drv, adapter->netdev,
+				  "Detected Tx Unit Hang\n"
+				  "  TDH                  <%x>\n"
+				  "  TDT                  <%x>\n"
+				  "  next_to_use          <%x>\n"
+				  "  next_to_clean        <%x>\n"
+				  "buffer_info[next_to_clean]\n"
+				  "  time_stamp           <%lx>\n"
+				  "  next_to_watch        <%x>\n"
+				  "  jiffies              <%lx>\n"
+				  "  next_to_watch.status <%x>\n",
+				  IXGB_READ_REG(&adapter->hw, TDH),
+				  IXGB_READ_REG(&adapter->hw, TDT),
+				  tx_ring->next_to_use,
+				  tx_ring->next_to_clean,
+				  tx_ring->buffer_info[eop].time_stamp,
+				  eop,
+				  jiffies,
+				  eop_desc->status);
+			netif_stop_queue(netdev);
+		}
+	}
+
+	return cleaned;
+}
+
+/**
+ * ixgb_rx_checksum - Receive Checksum Offload for 82597.
+ * @adapter: board private structure
+ * @rx_desc: receive descriptor
+ * @sk_buff: socket buffer with received data
+ **/
+
+static void
+ixgb_rx_checksum(struct ixgb_adapter *adapter,
+                 struct ixgb_rx_desc *rx_desc,
+                 struct sk_buff *skb)
+{
+	/* Ignore Checksum bit is set OR
+	 * TCP Checksum has not been calculated
+	 */
+	if ((rx_desc->status & IXGB_RX_DESC_STATUS_IXSM) ||
+	   (!(rx_desc->status & IXGB_RX_DESC_STATUS_TCPCS))) {
+		skb_checksum_none_assert(skb);
+		return;
+	}
+
+	/* At this point we know the hardware did the TCP checksum */
+	/* now look at the TCP checksum error bit */
+	if (rx_desc->errors & IXGB_RX_DESC_ERRORS_TCPE) {
+		/* let the stack verify checksum errors */
+		skb_checksum_none_assert(skb);
+		adapter->hw_csum_rx_error++;
+	} else {
+		/* TCP checksum is good */
+		skb->ip_summed = CHECKSUM_UNNECESSARY;
+		adapter->hw_csum_rx_good++;
+	}
+}
+
+/*
+ * this should improve performance for small packets with large amounts
+ * of reassembly being done in the stack
+ */
+static void ixgb_check_copybreak(struct net_device *netdev,
+				 struct ixgb_buffer *buffer_info,
+				 u32 length, struct sk_buff **skb)
+{
+	struct sk_buff *new_skb;
+
+	if (length > copybreak)
+		return;
+
+	new_skb = netdev_alloc_skb_ip_align(netdev, length);
+	if (!new_skb)
+		return;
+
+	skb_copy_to_linear_data_offset(new_skb, -NET_IP_ALIGN,
+				       (*skb)->data - NET_IP_ALIGN,
+				       length + NET_IP_ALIGN);
+	/* save the skb in buffer_info as good */
+	buffer_info->skb = *skb;
+	*skb = new_skb;
+}
+
+/**
+ * ixgb_clean_rx_irq - Send received data up the network stack,
+ * @adapter: board private structure
+ **/
+
+static bool
+ixgb_clean_rx_irq(struct ixgb_adapter *adapter, int *work_done, int work_to_do)
+{
+	struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
+	struct net_device *netdev = adapter->netdev;
+	struct pci_dev *pdev = adapter->pdev;
+	struct ixgb_rx_desc *rx_desc, *next_rxd;
+	struct ixgb_buffer *buffer_info, *next_buffer, *next2_buffer;
+	u32 length;
+	unsigned int i, j;
+	int cleaned_count = 0;
+	bool cleaned = false;
+
+	i = rx_ring->next_to_clean;
+	rx_desc = IXGB_RX_DESC(*rx_ring, i);
+	buffer_info = &rx_ring->buffer_info[i];
+
+	while (rx_desc->status & IXGB_RX_DESC_STATUS_DD) {
+		struct sk_buff *skb;
+		u8 status;
+
+		if (*work_done >= work_to_do)
+			break;
+
+		(*work_done)++;
+		rmb();	/* read descriptor and rx_buffer_info after status DD */
+		status = rx_desc->status;
+		skb = buffer_info->skb;
+		buffer_info->skb = NULL;
+
+		prefetch(skb->data - NET_IP_ALIGN);
+
+		if (++i == rx_ring->count)
+			i = 0;
+		next_rxd = IXGB_RX_DESC(*rx_ring, i);
+		prefetch(next_rxd);
+
+		j = i + 1;
+		if (j == rx_ring->count)
+			j = 0;
+		next2_buffer = &rx_ring->buffer_info[j];
+		prefetch(next2_buffer);
+
+		next_buffer = &rx_ring->buffer_info[i];
+
+		cleaned = true;
+		cleaned_count++;
+
+		dma_unmap_single(&pdev->dev,
+				 buffer_info->dma,
+				 buffer_info->length,
+				 DMA_FROM_DEVICE);
+		buffer_info->dma = 0;
+
+		length = le16_to_cpu(rx_desc->length);
+		rx_desc->length = 0;
+
+		if (unlikely(!(status & IXGB_RX_DESC_STATUS_EOP))) {
+
+			/* All receives must fit into a single buffer */
+
+			IXGB_DBG("Receive packet consumed multiple buffers "
+					 "length<%x>\n", length);
+
+			dev_kfree_skb_irq(skb);
+			goto rxdesc_done;
+		}
+
+		if (unlikely(rx_desc->errors &
+		    (IXGB_RX_DESC_ERRORS_CE | IXGB_RX_DESC_ERRORS_SE |
+		     IXGB_RX_DESC_ERRORS_P | IXGB_RX_DESC_ERRORS_RXE))) {
+			dev_kfree_skb_irq(skb);
+			goto rxdesc_done;
+		}
+
+		ixgb_check_copybreak(netdev, buffer_info, length, &skb);
+
+		/* Good Receive */
+		skb_put(skb, length);
+
+		/* Receive Checksum Offload */
+		ixgb_rx_checksum(adapter, rx_desc, skb);
+
+		skb->protocol = eth_type_trans(skb, netdev);
+		if (status & IXGB_RX_DESC_STATUS_VP)
+			__vlan_hwaccel_put_tag(skb,
+					       le16_to_cpu(rx_desc->special));
+
+		netif_receive_skb(skb);
+
+rxdesc_done:
+		/* clean up descriptor, might be written over by hw */
+		rx_desc->status = 0;
+
+		/* return some buffers to hardware, one at a time is too slow */
+		if (unlikely(cleaned_count >= IXGB_RX_BUFFER_WRITE)) {
+			ixgb_alloc_rx_buffers(adapter, cleaned_count);
+			cleaned_count = 0;
+		}
+
+		/* use prefetched values */
+		rx_desc = next_rxd;
+		buffer_info = next_buffer;
+	}
+
+	rx_ring->next_to_clean = i;
+
+	cleaned_count = IXGB_DESC_UNUSED(rx_ring);
+	if (cleaned_count)
+		ixgb_alloc_rx_buffers(adapter, cleaned_count);
+
+	return cleaned;
+}
+
+/**
+ * ixgb_alloc_rx_buffers - Replace used receive buffers
+ * @adapter: address of board private structure
+ **/
+
+static void
+ixgb_alloc_rx_buffers(struct ixgb_adapter *adapter, int cleaned_count)
+{
+	struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
+	struct net_device *netdev = adapter->netdev;
+	struct pci_dev *pdev = adapter->pdev;
+	struct ixgb_rx_desc *rx_desc;
+	struct ixgb_buffer *buffer_info;
+	struct sk_buff *skb;
+	unsigned int i;
+	long cleancount;
+
+	i = rx_ring->next_to_use;
+	buffer_info = &rx_ring->buffer_info[i];
+	cleancount = IXGB_DESC_UNUSED(rx_ring);
+
+
+	/* leave three descriptors unused */
+	while (--cleancount > 2 && cleaned_count--) {
+		/* recycle! its good for you */
+		skb = buffer_info->skb;
+		if (skb) {
+			skb_trim(skb, 0);
+			goto map_skb;
+		}
+
+		skb = netdev_alloc_skb_ip_align(netdev, adapter->rx_buffer_len);
+		if (unlikely(!skb)) {
+			/* Better luck next round */
+			adapter->alloc_rx_buff_failed++;
+			break;
+		}
+
+		buffer_info->skb = skb;
+		buffer_info->length = adapter->rx_buffer_len;
+map_skb:
+		buffer_info->dma = dma_map_single(&pdev->dev,
+		                                  skb->data,
+		                                  adapter->rx_buffer_len,
+						  DMA_FROM_DEVICE);
+
+		rx_desc = IXGB_RX_DESC(*rx_ring, i);
+		rx_desc->buff_addr = cpu_to_le64(buffer_info->dma);
+		/* guarantee DD bit not set now before h/w gets descriptor
+		 * this is the rest of the workaround for h/w double
+		 * writeback. */
+		rx_desc->status = 0;
+
+
+		if (++i == rx_ring->count) i = 0;
+		buffer_info = &rx_ring->buffer_info[i];
+	}
+
+	if (likely(rx_ring->next_to_use != i)) {
+		rx_ring->next_to_use = i;
+		if (unlikely(i-- == 0))
+			i = (rx_ring->count - 1);
+
+		/* Force memory writes to complete before letting h/w
+		 * know there are new descriptors to fetch.  (Only
+		 * applicable for weak-ordered memory model archs, such
+		 * as IA-64). */
+		wmb();
+		IXGB_WRITE_REG(&adapter->hw, RDT, i);
+	}
+}
+
+static void
+ixgb_vlan_strip_enable(struct ixgb_adapter *adapter)
+{
+	u32 ctrl;
+
+	/* enable VLAN tag insert/strip */
+	ctrl = IXGB_READ_REG(&adapter->hw, CTRL0);
+	ctrl |= IXGB_CTRL0_VME;
+	IXGB_WRITE_REG(&adapter->hw, CTRL0, ctrl);
+}
+
+static void
+ixgb_vlan_strip_disable(struct ixgb_adapter *adapter)
+{
+	u32 ctrl;
+
+	/* disable VLAN tag insert/strip */
+	ctrl = IXGB_READ_REG(&adapter->hw, CTRL0);
+	ctrl &= ~IXGB_CTRL0_VME;
+	IXGB_WRITE_REG(&adapter->hw, CTRL0, ctrl);
+}
+
+static void
+ixgb_vlan_rx_add_vid(struct net_device *netdev, u16 vid)
+{
+	struct ixgb_adapter *adapter = netdev_priv(netdev);
+	u32 vfta, index;
+
+	/* add VID to filter table */
+
+	index = (vid >> 5) & 0x7F;
+	vfta = IXGB_READ_REG_ARRAY(&adapter->hw, VFTA, index);
+	vfta |= (1 << (vid & 0x1F));
+	ixgb_write_vfta(&adapter->hw, index, vfta);
+	set_bit(vid, adapter->active_vlans);
+}
+
+static void
+ixgb_vlan_rx_kill_vid(struct net_device *netdev, u16 vid)
+{
+	struct ixgb_adapter *adapter = netdev_priv(netdev);
+	u32 vfta, index;
+
+	/* remove VID from filter table */
+
+	index = (vid >> 5) & 0x7F;
+	vfta = IXGB_READ_REG_ARRAY(&adapter->hw, VFTA, index);
+	vfta &= ~(1 << (vid & 0x1F));
+	ixgb_write_vfta(&adapter->hw, index, vfta);
+	clear_bit(vid, adapter->active_vlans);
+}
+
+static void
+ixgb_restore_vlan(struct ixgb_adapter *adapter)
+{
+	u16 vid;
+
+	for_each_set_bit(vid, adapter->active_vlans, VLAN_N_VID)
+		ixgb_vlan_rx_add_vid(adapter->netdev, vid);
+}
+
+#ifdef CONFIG_NET_POLL_CONTROLLER
+/*
+ * Polling 'interrupt' - used by things like netconsole to send skbs
+ * without having to re-enable interrupts. It's not called while
+ * the interrupt routine is executing.
+ */
+
+static void ixgb_netpoll(struct net_device *dev)
+{
+	struct ixgb_adapter *adapter = netdev_priv(dev);
+
+	disable_irq(adapter->pdev->irq);
+	ixgb_intr(adapter->pdev->irq, dev);
+	enable_irq(adapter->pdev->irq);
+}
+#endif
+
+/**
+ * ixgb_io_error_detected() - called when PCI error is detected
+ * @pdev    pointer to pci device with error
+ * @state   pci channel state after error
+ *
+ * This callback is called by the PCI subsystem whenever
+ * a PCI bus error is detected.
+ */
+static pci_ers_result_t ixgb_io_error_detected(struct pci_dev *pdev,
+                                               enum pci_channel_state state)
+{
+	struct net_device *netdev = pci_get_drvdata(pdev);
+	struct ixgb_adapter *adapter = netdev_priv(netdev);
+
+	netif_device_detach(netdev);
+
+	if (state == pci_channel_io_perm_failure)
+		return PCI_ERS_RESULT_DISCONNECT;
+
+	if (netif_running(netdev))
+		ixgb_down(adapter, true);
+
+	pci_disable_device(pdev);
+
+	/* Request a slot reset. */
+	return PCI_ERS_RESULT_NEED_RESET;
+}
+
+/**
+ * ixgb_io_slot_reset - called after the pci bus has been reset.
+ * @pdev    pointer to pci device with error
+ *
+ * This callback is called after the PCI bus has been reset.
+ * Basically, this tries to restart the card from scratch.
+ * This is a shortened version of the device probe/discovery code,
+ * it resembles the first-half of the ixgb_probe() routine.
+ */
+static pci_ers_result_t ixgb_io_slot_reset(struct pci_dev *pdev)
+{
+	struct net_device *netdev = pci_get_drvdata(pdev);
+	struct ixgb_adapter *adapter = netdev_priv(netdev);
+
+	if (pci_enable_device(pdev)) {
+		netif_err(adapter, probe, adapter->netdev,
+			  "Cannot re-enable PCI device after reset\n");
+		return PCI_ERS_RESULT_DISCONNECT;
+	}
+
+	/* Perform card reset only on one instance of the card */
+	if (0 != PCI_FUNC (pdev->devfn))
+		return PCI_ERS_RESULT_RECOVERED;
+
+	pci_set_master(pdev);
+
+	netif_carrier_off(netdev);
+	netif_stop_queue(netdev);
+	ixgb_reset(adapter);
+
+	/* Make sure the EEPROM is good */
+	if (!ixgb_validate_eeprom_checksum(&adapter->hw)) {
+		netif_err(adapter, probe, adapter->netdev,
+			  "After reset, the EEPROM checksum is not valid\n");
+		return PCI_ERS_RESULT_DISCONNECT;
+	}
+	ixgb_get_ee_mac_addr(&adapter->hw, netdev->dev_addr);
+	memcpy(netdev->perm_addr, netdev->dev_addr, netdev->addr_len);
+
+	if (!is_valid_ether_addr(netdev->perm_addr)) {
+		netif_err(adapter, probe, adapter->netdev,
+			  "After reset, invalid MAC address\n");
+		return PCI_ERS_RESULT_DISCONNECT;
+	}
+
+	return PCI_ERS_RESULT_RECOVERED;
+}
+
+/**
+ * ixgb_io_resume - called when its OK to resume normal operations
+ * @pdev    pointer to pci device with error
+ *
+ * The error recovery driver tells us that its OK to resume
+ * normal operation. Implementation resembles the second-half
+ * of the ixgb_probe() routine.
+ */
+static void ixgb_io_resume(struct pci_dev *pdev)
+{
+	struct net_device *netdev = pci_get_drvdata(pdev);
+	struct ixgb_adapter *adapter = netdev_priv(netdev);
+
+	pci_set_master(pdev);
+
+	if (netif_running(netdev)) {
+		if (ixgb_up(adapter)) {
+			pr_err("can't bring device back up after reset\n");
+			return;
+		}
+	}
+
+	netif_device_attach(netdev);
+	mod_timer(&adapter->watchdog_timer, jiffies);
+}
+
+/* ixgb_main.c */