text: // SPDX-License-Identifier: GPL-2.0
  /* Copyright(c) 1999 - 2006 Intel Corporation. */
  
  #include "e1000.h"
  #include <net/ip6_checksum.h>
  #include <linux/io.h>
  #include <linux/prefetch.h>
  #include <linux/bitops.h>
  #include <linux/if_vlan.h>
  
  char e1000_driver_name[] = "e1000";
  static char e1000_driver_string[] = "Intel(R) PRO/1000 Network Driver";
  static const char e1000_copyright[] = "Copyright (c) 1999-2006 Intel Corporation.";
  
  /* e1000_pci_tbl - PCI Device ID Table
   *
   * Last entry must be all 0s
   *
   * Macro expands to...
   *   {PCI_DEVICE(PCI_VENDOR_ID_INTEL, device_id)}
   */
  static const struct pci_device_id e1000_pci_tbl[] = {
  	INTEL_E1000_ETHERNET_DEVICE(0x1000),
  	INTEL_E1000_ETHERNET_DEVICE(0x1001),
  	INTEL_E1000_ETHERNET_DEVICE(0x1004),
  	INTEL_E1000_ETHERNET_DEVICE(0x1008),
  	INTEL_E1000_ETHERNET_DEVICE(0x1009),
  	INTEL_E1000_ETHERNET_DEVICE(0x100C),
  	INTEL_E1000_ETHERNET_DEVICE(0x100D),
  	INTEL_E1000_ETHERNET_DEVICE(0x100E),
  	INTEL_E1000_ETHERNET_DEVICE(0x100F),
  	INTEL_E1000_ETHERNET_DEVICE(0x1010),
  	INTEL_E1000_ETHERNET_DEVICE(0x1011),
  	INTEL_E1000_ETHERNET_DEVICE(0x1012),
  	INTEL_E1000_ETHERNET_DEVICE(0x1013),
  	INTEL_E1000_ETHERNET_DEVICE(0x1014),
  	INTEL_E1000_ETHERNET_DEVICE(0x1015),
  	INTEL_E1000_ETHERNET_DEVICE(0x1016),
  	INTEL_E1000_ETHERNET_DEVICE(0x1017),
  	INTEL_E1000_ETHERNET_DEVICE(0x1018),
  	INTEL_E1000_ETHERNET_DEVICE(0x1019),
  	INTEL_E1000_ETHERNET_DEVICE(0x101A),
  	INTEL_E1000_ETHERNET_DEVICE(0x101D),
  	INTEL_E1000_ETHERNET_DEVICE(0x101E),
  	INTEL_E1000_ETHERNET_DEVICE(0x1026),
  	INTEL_E1000_ETHERNET_DEVICE(0x1027),
  	INTEL_E1000_ETHERNET_DEVICE(0x1028),
  	INTEL_E1000_ETHERNET_DEVICE(0x1075),
  	INTEL_E1000_ETHERNET_DEVICE(0x1076),
  	INTEL_E1000_ETHERNET_DEVICE(0x1077),
  	INTEL_E1000_ETHERNET_DEVICE(0x1078),
  	INTEL_E1000_ETHERNET_DEVICE(0x1079),
  	INTEL_E1000_ETHERNET_DEVICE(0x107A),
  	INTEL_E1000_ETHERNET_DEVICE(0x107B),
  	INTEL_E1000_ETHERNET_DEVICE(0x107C),
  	INTEL_E1000_ETHERNET_DEVICE(0x108A),
  	INTEL_E1000_ETHERNET_DEVICE(0x1099),
  	INTEL_E1000_ETHERNET_DEVICE(0x10B5),
  	INTEL_E1000_ETHERNET_DEVICE(0x2E6E),
  	/* required last entry */
  	{0,}
  };
  
  MODULE_DEVICE_TABLE(pci, e1000_pci_tbl);
  
  int e1000_up(struct e1000_adapter *adapter);
  void e1000_down(struct e1000_adapter *adapter);
  void e1000_reinit_locked(struct e1000_adapter *adapter);
  void e1000_reset(struct e1000_adapter *adapter);
  int e1000_setup_all_tx_resources(struct e1000_adapter *adapter);
  int e1000_setup_all_rx_resources(struct e1000_adapter *adapter);
  void e1000_free_all_tx_resources(struct e1000_adapter *adapter);
  void e1000_free_all_rx_resources(struct e1000_adapter *adapter);
  static int e1000_setup_tx_resources(struct e1000_adapter *adapter,
  				    struct e1000_tx_ring *txdr);
  static int e1000_setup_rx_resources(struct e1000_adapter *adapter,
  				    struct e1000_rx_ring *rxdr);
  static void e1000_free_tx_resources(struct e1000_adapter *adapter,
  				    struct e1000_tx_ring *tx_ring);
  static void e1000_free_rx_resources(struct e1000_adapter *adapter,
  				    struct e1000_rx_ring *rx_ring);
  void e1000_update_stats(struct e1000_adapter *adapter);
  
  static int e1000_init_module(void);
  static void e1000_exit_module(void);
  static int e1000_probe(struct pci_dev *pdev, const struct pci_device_id *ent);
  static void e1000_remove(struct pci_dev *pdev);
  static int e1000_alloc_queues(struct e1000_adapter *adapter);
  static int e1000_sw_init(struct e1000_adapter *adapter);
  int e1000_open(struct net_device *netdev);
  int e1000_close(struct net_device *netdev);
  static void e1000_configure_tx(struct e1000_adapter *adapter);
  static void e1000_configure_rx(struct e1000_adapter *adapter);
  static void e1000_setup_rctl(struct e1000_adapter *adapter);
  static void e1000_clean_all_tx_rings(struct e1000_adapter *adapter);
  static void e1000_clean_all_rx_rings(struct e1000_adapter *adapter);
  static void e1000_clean_tx_ring(struct e1000_adapter *adapter,
  				struct e1000_tx_ring *tx_ring);
  static void e1000_clean_rx_ring(struct e1000_adapter *adapter,
  				struct e1000_rx_ring *rx_ring);
  static void e1000_set_rx_mode(struct net_device *netdev);
  static void e1000_update_phy_info_task(struct work_struct *work);
  static void e1000_watchdog(struct work_struct *work);
  static void e1000_82547_tx_fifo_stall_task(struct work_struct *work);
  static netdev_tx_t e1000_xmit_frame(struct sk_buff *skb,
  				    struct net_device *netdev);
  static int e1000_change_mtu(struct net_device *netdev, int new_mtu);
  static int e1000_set_mac(struct net_device *netdev, void *p);
  static irqreturn_t e1000_intr(int irq, void *data);
  static bool e1000_clean_tx_irq(struct e1000_adapter *adapter,
  			       struct e1000_tx_ring *tx_ring);
  static int e1000_clean(struct napi_struct *napi, int budget);
  static bool e1000_clean_rx_irq(struct e1000_adapter *adapter,
  			       struct e1000_rx_ring *rx_ring,
  			       int *work_done, int work_to_do);
  static bool e1000_clean_jumbo_rx_irq(struct e1000_adapter *adapter,
  				     struct e1000_rx_ring *rx_ring,
  				     int *work_done, int work_to_do);
  static void e1000_alloc_dummy_rx_buffers(struct e1000_adapter *adapter,
  					 struct e1000_rx_ring *rx_ring,
  					 int cleaned_count)
  {
  }
  static void e1000_alloc_rx_buffers(struct e1000_adapter *adapter,
  				   struct e1000_rx_ring *rx_ring,
  				   int cleaned_count);
  static void e1000_alloc_jumbo_rx_buffers(struct e1000_adapter *adapter,
  					 struct e1000_rx_ring *rx_ring,
  					 int cleaned_count);
  static int e1000_ioctl(struct net_device *netdev, struct ifreq *ifr, int cmd);
  static int e1000_mii_ioctl(struct net_device *netdev, struct ifreq *ifr,
  			   int cmd);
  static void e1000_enter_82542_rst(struct e1000_adapter *adapter);
  static void e1000_leave_82542_rst(struct e1000_adapter *adapter);
  static void e1000_tx_timeout(struct net_device *dev, unsigned int txqueue);
  static void e1000_reset_task(struct work_struct *work);
  static void e1000_smartspeed(struct e1000_adapter *adapter);
  static int e1000_82547_fifo_workaround(struct e1000_adapter *adapter,
  				       struct sk_buff *skb);
  
  static bool e1000_vlan_used(struct e1000_adapter *adapter);
  static void e1000_vlan_mode(struct net_device *netdev,
  			    netdev_features_t features);
  static void e1000_vlan_filter_on_off(struct e1000_adapter *adapter,
  				     bool filter_on);
  static int e1000_vlan_rx_add_vid(struct net_device *netdev,
  				 __be16 proto, u16 vid);
  static int e1000_vlan_rx_kill_vid(struct net_device *netdev,
  				  __be16 proto, u16 vid);
  static void e1000_restore_vlan(struct e1000_adapter *adapter);
  
  static int __maybe_unused e1000_suspend(struct device *dev);
  static int __maybe_unused e1000_resume(struct device *dev);
  static void e1000_shutdown(struct pci_dev *pdev);
  
  #ifdef CONFIG_NET_POLL_CONTROLLER
  /* for netdump / net console */
  static void e1000_netpoll (struct net_device *netdev);
  #endif
  
  #define COPYBREAK_DEFAULT 256
  static unsigned int copybreak __read_mostly = COPYBREAK_DEFAULT;
  module_param(copybreak, uint, 0644);
  MODULE_PARM_DESC(copybreak,
  	"Maximum size of packet that is copied to a new buffer on receive");
  
  static pci_ers_result_t e1000_io_error_detected(struct pci_dev *pdev,
  						pci_channel_state_t state);
  static pci_ers_result_t e1000_io_slot_reset(struct pci_dev *pdev);
  static void e1000_io_resume(struct pci_dev *pdev);
  
  static const struct pci_error_handlers e1000_err_handler = {
  	.error_detected = e1000_io_error_detected,
  	.slot_reset = e1000_io_slot_reset,
  	.resume = e1000_io_resume,
  };
  
  static SIMPLE_DEV_PM_OPS(e1000_pm_ops, e1000_suspend, e1000_resume);
  
  static struct pci_driver e1000_driver = {
  	.name     = e1000_driver_name,
  	.id_table = e1000_pci_tbl,
  	.probe    = e1000_probe,
  	.remove   = e1000_remove,
  	.driver = {
  		.pm = &e1000_pm_ops,
  	},
  	.shutdown = e1000_shutdown,
  	.err_handler = &e1000_err_handler
  };
  
  MODULE_AUTHOR("Intel Corporation, <linux.nics@intel.com>");
  MODULE_DESCRIPTION("Intel(R) PRO/1000 Network Driver");
  MODULE_LICENSE("GPL v2");
  
  #define DEFAULT_MSG_ENABLE (NETIF_MSG_DRV|NETIF_MSG_PROBE|NETIF_MSG_LINK)
  static int debug = -1;
  module_param(debug, int, 0);
  MODULE_PARM_DESC(debug, "Debug level (0=none,...,16=all)");
  
  /**
   * e1000_get_hw_dev - helper function for getting netdev
   * @hw: pointer to HW struct
   *
   * return device used by hardware layer to print debugging information
   *
   **/
  struct net_device *e1000_get_hw_dev(struct e1000_hw *hw)
  {
  	struct e1000_adapter *adapter = hw->back;
  	return adapter->netdev;
  }
  
  /**
   * e1000_init_module - Driver Registration Routine
   *
   * e1000_init_module is the first routine called when the driver is
   * loaded. All it does is register with the PCI subsystem.
   **/
  static int __init e1000_init_module(void)
  {
  	int ret;
  	pr_info("%s\n", e1000_driver_string);
  
  	pr_info("%s\n", e1000_copyright);
  
  	ret = pci_register_driver(&e1000_driver);
  	if (copybreak != COPYBREAK_DEFAULT) {
  		if (copybreak == 0)
  			pr_info("copybreak disabled\n");
  		else
  			pr_info("copybreak enabled for "
  				   "packets <= %u bytes\n", copybreak);
  	}
  	return ret;
  }
  
  module_init(e1000_init_module);
  
  /**
   * e1000_exit_module - Driver Exit Cleanup Routine
   *
   * e1000_exit_module is called just before the driver is removed
   * from memory.
   **/
  static void __exit e1000_exit_module(void)
  {
  	pci_unregister_driver(&e1000_driver);
  }
  
  module_exit(e1000_exit_module);
  
  static int e1000_request_irq(struct e1000_adapter *adapter)
  {
  	struct net_device *netdev = adapter->netdev;
  	irq_handler_t handler = e1000_intr;
  	int irq_flags = IRQF_SHARED;
  	int err;
  
  	err = request_irq(adapter->pdev->irq, handler, irq_flags, netdev->name,
  			  netdev);
  	if (err) {
  		e_err(probe, "Unable to allocate interrupt Error: %d\n", err);
  	}
  
  	return err;
  }
  
  static void e1000_free_irq(struct e1000_adapter *adapter)
  {
  	struct net_device *netdev = adapter->netdev;
  
  	free_irq(adapter->pdev->irq, netdev);
  }
  
  /**
   * e1000_irq_disable - Mask off interrupt generation on the NIC
   * @adapter: board private structure
   **/
  static void e1000_irq_disable(struct e1000_adapter *adapter)
  {
  	struct e1000_hw *hw = &adapter->hw;
  
  	ew32(IMC, ~0);
  	E1000_WRITE_FLUSH();
  	synchronize_irq(adapter->pdev->irq);
  }
  
  /**
   * e1000_irq_enable - Enable default interrupt generation settings
   * @adapter: board private structure
   **/
  static void e1000_irq_enable(struct e1000_adapter *adapter)
  {
  	struct e1000_hw *hw = &adapter->hw;
  
  	ew32(IMS, IMS_ENABLE_MASK);
  	E1000_WRITE_FLUSH();
  }
  
  static void e1000_update_mng_vlan(struct e1000_adapter *adapter)
  {
  	struct e1000_hw *hw = &adapter->hw;
  	struct net_device *netdev = adapter->netdev;
  	u16 vid = hw->mng_cookie.vlan_id;
  	u16 old_vid = adapter->mng_vlan_id;
  
  	if (!e1000_vlan_used(adapter))
  		return;
  
  	if (!test_bit(vid, adapter->active_vlans)) {
  		if (hw->mng_cookie.status &
  		    E1000_MNG_DHCP_COOKIE_STATUS_VLAN_SUPPORT) {
  			e1000_vlan_rx_add_vid(netdev, htons(ETH_P_8021Q), vid);
  			adapter->mng_vlan_id = vid;
  		} else {
  			adapter->mng_vlan_id = E1000_MNG_VLAN_NONE;
  		}
  		if ((old_vid != (u16)E1000_MNG_VLAN_NONE) &&
  		    (vid != old_vid) &&
  		    !test_bit(old_vid, adapter->active_vlans))
  			e1000_vlan_rx_kill_vid(netdev, htons(ETH_P_8021Q),
  					       old_vid);
  	} else {
  		adapter->mng_vlan_id = vid;
  	}
  }
  
  static void e1000_init_manageability(struct e1000_adapter *adapter)
  {
  	struct e1000_hw *hw = &adapter->hw;
  
  	if (adapter->en_mng_pt) {
  		u32 manc = er32(MANC);
  
  		/* disable hardware interception of ARP */
  		manc &= ~(E1000_MANC_ARP_EN);
  
  		ew32(MANC, manc);
  	}
  }
  
  static void e1000_release_manageability(struct e1000_adapter *adapter)
  {
  	struct e1000_hw *hw = &adapter->hw;
  
  	if (adapter->en_mng_pt) {
  		u32 manc = er32(MANC);
  
  		/* re-enable hardware interception of ARP */
  		manc |= E1000_MANC_ARP_EN;
  
  		ew32(MANC, manc);
  	}
  }
  
  /**
   * e1000_configure - configure the hardware for RX and TX
   * @adapter: private board structure
   **/
  static void e1000_configure(struct e1000_adapter *adapter)
  {
  	struct net_device *netdev = adapter->netdev;
  	int i;
  
  	e1000_set_rx_mode(netdev);
  
  	e1000_restore_vlan(adapter);
  	e1000_init_manageability(adapter);
  
  	e1000_configure_tx(adapter);
  	e1000_setup_rctl(adapter);
  	e1000_configure_rx(adapter);
  	/* call E1000_DESC_UNUSED which always leaves
  	 * at least 1 descriptor unused to make sure
  	 * next_to_use != next_to_clean
  	 */
  	for (i = 0; i < adapter->num_rx_queues; i++) {
  		struct e1000_rx_ring *ring = &adapter->rx_ring[i];
  		adapter->alloc_rx_buf(adapter, ring,
  				      E1000_DESC_UNUSED(ring));
  	}
  }
  
  int e1000_up(struct e1000_adapter *adapter)
  {
  	struct e1000_hw *hw = &adapter->hw;
  
  	/* hardware has been reset, we need to reload some things */
  	e1000_configure(adapter);
  
  	clear_bit(__E1000_DOWN, &adapter->flags);
  
  	napi_enable(&adapter->napi);
  
  	e1000_irq_enable(adapter);
  
  	netif_wake_queue(adapter->netdev);
  
  	/* fire a link change interrupt to start the watchdog */
  	ew32(ICS, E1000_ICS_LSC);
  	return 0;
  }
  
  /**
   * e1000_power_up_phy - restore link in case the phy was powered down
   * @adapter: address of board private structure
   *
   * The phy may be powered down to save power and turn off link when the
   * driver is unloaded and wake on lan is not enabled (among others)
   * *** this routine MUST be followed by a call to e1000_reset ***
   **/
  void e1000_power_up_phy(struct e1000_adapter *adapter)
  {
  	struct e1000_hw *hw = &adapter->hw;
  	u16 mii_reg = 0;
  
  	/* Just clear the power down bit to wake the phy back up */
  	if (hw->media_type == e1000_media_type_copper) {
  		/* according to the manual, the phy will retain its
  		 * settings across a power-down/up cycle
  		 */
  		e1000_read_phy_reg(hw, PHY_CTRL, &mii_reg);
  		mii_reg &= ~MII_CR_POWER_DOWN;
  		e1000_write_phy_reg(hw, PHY_CTRL, mii_reg);
  	}
  }
  
  static void e1000_power_down_phy(struct e1000_adapter *adapter)
  {
  	struct e1000_hw *hw = &adapter->hw;
  
  	/* Power down the PHY so no link is implied when interface is down *
  	 * The PHY cannot be powered down if any of the following is true *
  	 * (a) WoL is enabled
  	 * (b) AMT is active
  	 * (c) SoL/IDER session is active
  	 */
  	if (!adapter->wol && hw->mac_type >= e1000_82540 &&
  	   hw->media_type == e1000_media_type_copper) {
  		u16 mii_reg = 0;
  
  		switch (hw->mac_type) {
  		case e1000_82540:
  		case e1000_82545:
  		case e1000_82545_rev_3:
  		case e1000_82546:
  		case e1000_ce4100:
  		case e1000_82546_rev_3:
  		case e1000_82541:
  		case e1000_82541_rev_2:
  		case e1000_82547:
  		case e1000_82547_rev_2:
  			if (er32(MANC) & E1000_MANC_SMBUS_EN)
  				goto out;
  			break;
  		default:
  			goto out;
  		}
  		e1000_read_phy_reg(hw, PHY_CTRL, &mii_reg);
  		mii_reg |= MII_CR_POWER_DOWN;
  		e1000_write_phy_reg(hw, PHY_CTRL, mii_reg);
  		msleep(1);
  	}
  out:
  	return;
  }
  
  static void e1000_down_and_stop(struct e1000_adapter *adapter)
  {
  	set_bit(__E1000_DOWN, &adapter->flags);
  
  	cancel_delayed_work_sync(&adapter->watchdog_task);
  
  	/*
  	 * Since the watchdog task can reschedule other tasks, we should cancel
  	 * it first, otherwise we can run into the situation when a work is
  	 * still running after the adapter has been turned down.
  	 */
  
  	cancel_delayed_work_sync(&adapter->phy_info_task);
  	cancel_delayed_work_sync(&adapter->fifo_stall_task);
  
  	/* Only kill reset task if adapter is not resetting */
  	if (!test_bit(__E1000_RESETTING, &adapter->flags))
  		cancel_work_sync(&adapter->reset_task);
  }
  
  void e1000_down(struct e1000_adapter *adapter)
  {
  	struct e1000_hw *hw = &adapter->hw;
  	struct net_device *netdev = adapter->netdev;
  	u32 rctl, tctl;
  
  	/* disable receives in the hardware */
  	rctl = er32(RCTL);
  	ew32(RCTL, rctl & ~E1000_RCTL_EN);
  	/* flush and sleep below */
  
  	netif_tx_disable(netdev);
  
  	/* disable transmits in the hardware */
  	tctl = er32(TCTL);
  	tctl &= ~E1000_TCTL_EN;
  	ew32(TCTL, tctl);
  	/* flush both disables and wait for them to finish */
  	E1000_WRITE_FLUSH();
  	msleep(10);
  
  	/* Set the carrier off after transmits have been disabled in the
  	 * hardware, to avoid race conditions with e1000_watchdog() (which
  	 * may be running concurrently to us, checking for the carrier
  	 * bit to decide whether it should enable transmits again). Such
  	 * a race condition would result into transmission being disabled
  	 * in the hardware until the next IFF_DOWN+IFF_UP cycle.
  	 */
  	netif_carrier_off(netdev);
  
  	napi_disable(&adapter->napi);
  
  	e1000_irq_disable(adapter);
  
  	/* Setting DOWN must be after irq_disable to prevent
  	 * a screaming interrupt.  Setting DOWN also prevents
  	 * tasks from rescheduling.
  	 */
  	e1000_down_and_stop(adapter);
  
  	adapter->link_speed = 0;
  	adapter->link_duplex = 0;
  
  	e1000_reset(adapter);
  	e1000_clean_all_tx_rings(adapter);
  	e1000_clean_all_rx_rings(adapter);
  }
  
  void e1000_reinit_locked(struct e1000_adapter *adapter)
  {
  	while (test_and_set_bit(__E1000_RESETTING, &adapter->flags))
  		msleep(1);
  
  	/* only run the task if not already down */
  	if (!test_bit(__E1000_DOWN, &adapter->flags)) {
  		e1000_down(adapter);
  		e1000_up(adapter);
  	}
  
  	clear_bit(__E1000_RESETTING, &adapter->flags);
  }
  
  void e1000_reset(struct e1000_adapter *adapter)
  {
  	struct e1000_hw *hw = &adapter->hw;
  	u32 pba = 0, tx_space, min_tx_space, min_rx_space;
  	bool legacy_pba_adjust = false;
  	u16 hwm;
  
  	/* Repartition Pba for greater than 9k mtu
  	 * To take effect CTRL.RST is required.
  	 */
  
  	switch (hw->mac_type) {
  	case e1000_82542_rev2_0:
  	case e1000_82542_rev2_1:
  	case e1000_82543:
  	case e1000_82544:
  	case e1000_82540:
  	case e1000_82541:
  	case e1000_82541_rev_2:
  		legacy_pba_adjust = true;
  		pba = E1000_PBA_48K;
  		break;
  	case e1000_82545:
  	case e1000_82545_rev_3:
  	case e1000_82546:
  	case e1000_ce4100:
  	case e1000_82546_rev_3:
  		pba = E1000_PBA_48K;
  		break;
  	case e1000_82547:
  	case e1000_82547_rev_2:
  		legacy_pba_adjust = true;
  		pba = E1000_PBA_30K;
  		break;
  	case e1000_undefined:
  	case e1000_num_macs:
  		break;
  	}
  
  	if (legacy_pba_adjust) {
  		if (hw->max_frame_size > E1000_RXBUFFER_8192)
  			pba -= 8; /* allocate more FIFO for Tx */
  
  		if (hw->mac_type == e1000_82547) {
  			adapter->tx_fifo_head = 0;
  			adapter->tx_head_addr = pba << E1000_TX_HEAD_ADDR_SHIFT;
  			adapter->tx_fifo_size =
  				(E1000_PBA_40K - pba) << E1000_PBA_BYTES_SHIFT;
  			atomic_set(&adapter->tx_fifo_stall, 0);
  		}
  	} else if (hw->max_frame_size >  ETH_FRAME_LEN + ETH_FCS_LEN) {
  		/* adjust PBA for jumbo frames */
  		ew32(PBA, pba);
  
  		/* To maintain wire speed transmits, the Tx FIFO should be
  		 * large enough to accommodate two full transmit packets,
  		 * rounded up to the next 1KB and expressed in KB.  Likewise,
  		 * the Rx FIFO should be large enough to accommodate at least
  		 * one full receive packet and is similarly rounded up and
  		 * expressed in KB.
  		 */
  		pba = er32(PBA);
  		/* upper 16 bits has Tx packet buffer allocation size in KB */
  		tx_space = pba >> 16;
  		/* lower 16 bits has Rx packet buffer allocation size in KB */
  		pba &= 0xffff;
  		/* the Tx fifo also stores 16 bytes of information about the Tx
  		 * but don't include ethernet FCS because hardware appends it
  		 */
  		min_tx_space = (hw->max_frame_size +
  				sizeof(struct e1000_tx_desc) -
  				ETH_FCS_LEN) * 2;
  		min_tx_space = ALIGN(min_tx_space, 1024);
  		min_tx_space >>= 10;
  		/* software strips receive CRC, so leave room for it */
  		min_rx_space = hw->max_frame_size;
  		min_rx_space = ALIGN(min_rx_space, 1024);
  		min_rx_space >>= 10;
  
  		/* If current Tx allocation is less than the min Tx FIFO size,
  		 * and the min Tx FIFO size is less than the current Rx FIFO
  		 * allocation, take space away from current Rx allocation
  		 */
  		if (tx_space < min_tx_space &&
  		    ((min_tx_space - tx_space) < pba)) {
  			pba = pba - (min_tx_space - tx_space);
  
  			/* PCI/PCIx hardware has PBA alignment constraints */
  			switch (hw->mac_type) {
  			case e1000_82545 ... e1000_82546_rev_3:
  				pba &= ~(E1000_PBA_8K - 1);
  				break;
  			default:
  				break;
  			}
  
  			/* if short on Rx space, Rx wins and must trump Tx
  			 * adjustment or use Early Receive if available
  			 */
  			if (pba < min_rx_space)
  				pba = min_rx_space;
  		}
  	}
  
  	ew32(PBA, pba);
  
  	/* flow control settings:
  	 * The high water mark must be low enough to fit one full frame
  	 * (or the size used for early receive) above it in the Rx FIFO.
  	 * Set it to the lower of:
  	 * - 90% of the Rx FIFO size, and
  	 * - the full Rx FIFO size minus the early receive size (for parts
  	 *   with ERT support assuming ERT set to E1000_ERT_2048), or
  	 * - the full Rx FIFO size minus one full frame
  	 */
  	hwm = min(((pba << 10) * 9 / 10),
  		  ((pba << 10) - hw->max_frame_size));
  
  	hw->fc_high_water = hwm & 0xFFF8;	/* 8-byte granularity */
  	hw->fc_low_water = hw->fc_high_water - 8;
  	hw->fc_pause_time = E1000_FC_PAUSE_TIME;
  	hw->fc_send_xon = 1;
  	hw->fc = hw->original_fc;
  
  	/* Allow time for pending master requests to run */
  	e1000_reset_hw(hw);
  	if (hw->mac_type >= e1000_82544)
  		ew32(WUC, 0);
  
  	if (e1000_init_hw(hw))
  		e_dev_err("Hardware Error\n");
  	e1000_update_mng_vlan(adapter);
  
  	/* if (adapter->hwflags & HWFLAGS_PHY_PWR_BIT) { */
  	if (hw->mac_type >= e1000_82544 &&
  	    hw->autoneg == 1 &&
  	    hw->autoneg_advertised == ADVERTISE_1000_FULL) {
  		u32 ctrl = er32(CTRL);
  		/* clear phy power management bit if we are in gig only mode,
  		 * which if enabled will attempt negotiation to 100Mb, which
  		 * can cause a loss of link at power off or driver unload
  		 */
  		ctrl &= ~E1000_CTRL_SWDPIN3;
  		ew32(CTRL, ctrl);
  	}
  
  	/* Enable h/w to recognize an 802.1Q VLAN Ethernet packet */
  	ew32(VET, ETHERNET_IEEE_VLAN_TYPE);
  
  	e1000_reset_adaptive(hw);
  	e1000_phy_get_info(hw, &adapter->phy_info);
  
  	e1000_release_manageability(adapter);
  }
  
  /* Dump the eeprom for users having checksum issues */
  static void e1000_dump_eeprom(struct e1000_adapter *adapter)
  {
  	struct net_device *netdev = adapter->netdev;
  	struct ethtool_eeprom eeprom;
  	const struct ethtool_ops *ops = netdev->ethtool_ops;
  	u8 *data;
  	int i;
  	u16 csum_old, csum_new = 0;
  
  	eeprom.len = ops->get_eeprom_len(netdev);
  	eeprom.offset = 0;
  
  	data = kmalloc(eeprom.len, GFP_KERNEL);
  	if (!data)
  		return;
  
  	ops->get_eeprom(netdev, &eeprom, data);
  
  	csum_old = (data[EEPROM_CHECKSUM_REG * 2]) +
  		   (data[EEPROM_CHECKSUM_REG * 2 + 1] << 8);
  	for (i = 0; i < EEPROM_CHECKSUM_REG * 2; i += 2)
  		csum_new += data[i] + (data[i + 1] << 8);
  	csum_new = EEPROM_SUM - csum_new;
  
  	pr_err("/*********************/\n");
  	pr_err("Current EEPROM Checksum : 0x%04x\n", csum_old);
  	pr_err("Calculated              : 0x%04x\n", csum_new);
  
  	pr_err("Offset    Values\n");
  	pr_err("========  ======\n");
  	print_hex_dump(KERN_ERR, "", DUMP_PREFIX_OFFSET, 16, 1, data, 128, 0);
  
  	pr_err("Include this output when contacting your support provider.\n");
  	pr_err("This is not a software error! Something bad happened to\n");
  	pr_err("your hardware or EEPROM image. Ignoring this problem could\n");
  	pr_err("result in further problems, possibly loss of data,\n");
  	pr_err("corruption or system hangs!\n");
  	pr_err("The MAC Address will be reset to 00:00:00:00:00:00,\n");
  	pr_err("which is invalid and requires you to set the proper MAC\n");
  	pr_err("address manually before continuing to enable this network\n");
  	pr_err("device. Please inspect the EEPROM dump and report the\n");
  	pr_err("issue to your hardware vendor or Intel Customer Support.\n");
  	pr_err("/*********************/\n");
  
  	kfree(data);
  }
  
  /**
   * e1000_is_need_ioport - determine if an adapter needs ioport resources or not
   * @pdev: PCI device information struct
   *
   * Return true if an adapter needs ioport resources
   **/
  static int e1000_is_need_ioport(struct pci_dev *pdev)
  {
  	switch (pdev->device) {
  	case E1000_DEV_ID_82540EM:
  	case E1000_DEV_ID_82540EM_LOM:
  	case E1000_DEV_ID_82540EP:
  	case E1000_DEV_ID_82540EP_LOM:
  	case E1000_DEV_ID_82540EP_LP:
  	case E1000_DEV_ID_82541EI:
  	case E1000_DEV_ID_82541EI_MOBILE:
  	case E1000_DEV_ID_82541ER:
  	case E1000_DEV_ID_82541ER_LOM:
  	case E1000_DEV_ID_82541GI:
  	case E1000_DEV_ID_82541GI_LF:
  	case E1000_DEV_ID_82541GI_MOBILE:
  	case E1000_DEV_ID_82544EI_COPPER:
  	case E1000_DEV_ID_82544EI_FIBER:
  	case E1000_DEV_ID_82544GC_COPPER:
  	case E1000_DEV_ID_82544GC_LOM:
  	case E1000_DEV_ID_82545EM_COPPER:
  	case E1000_DEV_ID_82545EM_FIBER:
  	case E1000_DEV_ID_82546EB_COPPER:
  	case E1000_DEV_ID_82546EB_FIBER:
  	case E1000_DEV_ID_82546EB_QUAD_COPPER:
  		return true;
  	default:
  		return false;
  	}
  }
  
  static netdev_features_t e1000_fix_features(struct net_device *netdev,
  	netdev_features_t features)
  {
  	/* Since there is no support for separate Rx/Tx vlan accel
  	 * enable/disable make sure Tx flag is always in same state as Rx.
  	 */
  	if (features & NETIF_F_HW_VLAN_CTAG_RX)
  		features |= NETIF_F_HW_VLAN_CTAG_TX;
  	else
  		features &= ~NETIF_F_HW_VLAN_CTAG_TX;
  
  	return features;
  }
  
  static int e1000_set_features(struct net_device *netdev,
  	netdev_features_t features)
  {
  	struct e1000_adapter *adapter = netdev_priv(netdev);
  	netdev_features_t changed = features ^ netdev->features;
  
  	if (changed & NETIF_F_HW_VLAN_CTAG_RX)
  		e1000_vlan_mode(netdev, features);
  
  	if (!(changed & (NETIF_F_RXCSUM | NETIF_F_RXALL)))
  		return 0;
  
  	netdev->features = features;
  	adapter->rx_csum = !!(features & NETIF_F_RXCSUM);
  
  	if (netif_running(netdev))
  		e1000_reinit_locked(adapter);
  	else
  		e1000_reset(adapter);
  
  	return 1;
  }
  
  static const struct net_device_ops e1000_netdev_ops = {
  	.ndo_open		= e1000_open,
  	.ndo_stop		= e1000_close,
  	.ndo_start_xmit		= e1000_xmit_frame,
  	.ndo_set_rx_mode	= e1000_set_rx_mode,
  	.ndo_set_mac_address	= e1000_set_mac,
  	.ndo_tx_timeout		= e1000_tx_timeout,
  	.ndo_change_mtu		= e1000_change_mtu,
  	.ndo_eth_ioctl		= e1000_ioctl,
  	.ndo_validate_addr	= eth_validate_addr,
  	.ndo_vlan_rx_add_vid	= e1000_vlan_rx_add_vid,
  	.ndo_vlan_rx_kill_vid	= e1000_vlan_rx_kill_vid,
  #ifdef CONFIG_NET_POLL_CONTROLLER
  	.ndo_poll_controller	= e1000_netpoll,
  #endif
  	.ndo_fix_features	= e1000_fix_features,
  	.ndo_set_features	= e1000_set_features,
  };
  
  /**
   * e1000_init_hw_struct - initialize members of hw struct
   * @adapter: board private struct
   * @hw: structure used by e1000_hw.c
   *
   * Factors out initialization of the e1000_hw struct to its own function
   * that can be called very early at init (just after struct allocation).
   * Fields are initialized based on PCI device information and
   * OS network device settings (MTU size).
   * Returns negative error codes if MAC type setup fails.
   */
  static int e1000_init_hw_struct(struct e1000_adapter *adapter,
  				struct e1000_hw *hw)
  {
  	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->revision_id = pdev->revision;
  
  	pci_read_config_word(pdev, PCI_COMMAND, &hw->pci_cmd_word);
  
  	hw->max_frame_size = adapter->netdev->mtu +
  			     ENET_HEADER_SIZE + ETHERNET_FCS_SIZE;
  	hw->min_frame_size = MINIMUM_ETHERNET_FRAME_SIZE;
  
  	/* identify the MAC */
  	if (e1000_set_mac_type(hw)) {
  		e_err(probe, "Unknown MAC Type\n");
  		return -EIO;
  	}
  
  	switch (hw->mac_type) {
  	default:
  		break;
  	case e1000_82541:
  	case e1000_82547:
  	case e1000_82541_rev_2:
  	case e1000_82547_rev_2:
  		hw->phy_init_script = 1;
  		break;
  	}
  
  	e1000_set_media_type(hw);
  	e1000_get_bus_info(hw);
  
  	hw->wait_autoneg_complete = false;
  	hw->tbi_compatibility_en = true;
  	hw->adaptive_ifs = true;
  
  	/* Copper options */
  
  	if (hw->media_type == e1000_media_type_copper) {
  		hw->mdix = AUTO_ALL_MODES;
  		hw->disable_polarity_correction = false;
  		hw->master_slave = E1000_MASTER_SLAVE;
  	}
  
  	return 0;
  }
  
  /**
   * e1000_probe - Device Initialization Routine
   * @pdev: PCI device information struct
   * @ent: entry in e1000_pci_tbl
   *
   * Returns 0 on success, negative on failure
   *
   * e1000_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 e1000_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
  {
  	struct net_device *netdev;
  	struct e1000_adapter *adapter = NULL;
  	struct e1000_hw *hw;
  
  	static int cards_found;
  	static int global_quad_port_a; /* global ksp3 port a indication */
  	int i, err, pci_using_dac;
  	u16 eeprom_data = 0;
  	u16 tmp = 0;
  	u16 eeprom_apme_mask = E1000_EEPROM_APME;
  	int bars, need_ioport;
  	bool disable_dev = false;
  
  	/* do not allocate ioport bars when not needed */
  	need_ioport = e1000_is_need_ioport(pdev);
  	if (need_ioport) {
  		bars = pci_select_bars(pdev, IORESOURCE_MEM | IORESOURCE_IO);
  		err = pci_enable_device(pdev);
  	} else {
  		bars = pci_select_bars(pdev, IORESOURCE_MEM);
  		err = pci_enable_device_mem(pdev);
  	}
  	if (err)
  		return err;
  
  	err = pci_request_selected_regions(pdev, bars, e1000_driver_name);
  	if (err)
  		goto err_pci_reg;
  
  	pci_set_master(pdev);
  	err = pci_save_state(pdev);
  	if (err)
  		goto err_alloc_etherdev;
  
  	err = -ENOMEM;
  	netdev = alloc_etherdev(sizeof(struct e1000_adapter));
  	if (!netdev)
  		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->msg_enable = netif_msg_init(debug, DEFAULT_MSG_ENABLE);
  	adapter->bars = bars;
  	adapter->need_ioport = need_ioport;
  
  	hw = &adapter->hw;
  	hw->back = adapter;
  
  	err = -EIO;
  	hw->hw_addr = pci_ioremap_bar(pdev, BAR_0);
  	if (!hw->hw_addr)
  		goto err_ioremap;
  
  	if (adapter->need_ioport) {
  		for (i = BAR_1; i < PCI_STD_NUM_BARS; i++) {
  			if (pci_resource_len(pdev, i) == 0)
  				continue;
  			if (pci_resource_flags(pdev, i) & IORESOURCE_IO) {
  				hw->io_base = pci_resource_start(pdev, i);
  				break;
  			}
  		}
  	}
  
  	/* make ready for any if (hw->...) below */
  	err = e1000_init_hw_struct(adapter, hw);
  	if (err)
  		goto err_sw_init;
  
  	/* there is a workaround being applied below that limits
  	 * 64-bit DMA addresses to 64-bit hardware.  There are some
  	 * 32-bit adapters that Tx hang when given 64-bit DMA addresses
  	 */
  	pci_using_dac = 0;
  	if ((hw->bus_type == e1000_bus_type_pcix) &&
  	    !dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(64))) {
  		pci_using_dac = 1;
  	} else {
  		err = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32));
  		if (err) {
  			pr_err("No usable DMA config, aborting\n");
  			goto err_dma;
  		}
  	}
  
  	netdev->netdev_ops = &e1000_netdev_ops;
  	e1000_set_ethtool_ops(netdev);
  	netdev->watchdog_timeo = 5 * HZ;
  	netif_napi_add(netdev, &adapter->napi, e1000_clean, 64);
  
  	strncpy(netdev->name, pci_name(pdev), sizeof(netdev->name) - 1);
  
  	adapter->bd_number = cards_found;
  
  	/* setup the private structure */
  
  	err = e1000_sw_init(adapter);
  	if (err)
  		goto err_sw_init;
  
  	err = -EIO;
  	if (hw->mac_type == e1000_ce4100) {
  		hw->ce4100_gbe_mdio_base_virt =
  					ioremap(pci_resource_start(pdev, BAR_1),
  						pci_resource_len(pdev, BAR_1));
  
  		if (!hw->ce4100_gbe_mdio_base_virt)
  			goto err_mdio_ioremap;
  	}
  
  	if (hw->mac_type >= e1000_82543) {
  		netdev->hw_features = NETIF_F_SG |
  				   NETIF_F_HW_CSUM |
  				   NETIF_F_HW_VLAN_CTAG_RX;
  		netdev->features = NETIF_F_HW_VLAN_CTAG_TX |
  				   NETIF_F_HW_VLAN_CTAG_FILTER;
  	}
  
  	if ((hw->mac_type >= e1000_82544) &&
  	   (hw->mac_type != e1000_82547))
  		netdev->hw_features |= NETIF_F_TSO;
  
  	netdev->priv_flags |= IFF_SUPP_NOFCS;
  
  	netdev->features |= netdev->hw_features;
  	netdev->hw_features |= (NETIF_F_RXCSUM |
  				NETIF_F_RXALL |
  				NETIF_F_RXFCS);
  
  	if (pci_using_dac) {
  		netdev->features |= NETIF_F_HIGHDMA;
  		netdev->vlan_features |= NETIF_F_HIGHDMA;
  	}
  
  	netdev->vlan_features |= (NETIF_F_TSO |
  				  NETIF_F_HW_CSUM |
  				  NETIF_F_SG);
  
  	/* Do not set IFF_UNICAST_FLT for VMWare's 82545EM */
  	if (hw->device_id != E1000_DEV_ID_82545EM_COPPER ||
  	    hw->subsystem_vendor_id != PCI_VENDOR_ID_VMWARE)
  		netdev->priv_flags |= IFF_UNICAST_FLT;
  
  	/* MTU range: 46 - 16110 */
  	netdev->min_mtu = ETH_ZLEN - ETH_HLEN;
  	netdev->max_mtu = MAX_JUMBO_FRAME_SIZE - (ETH_HLEN + ETH_FCS_LEN);
  
  	adapter->en_mng_pt = e1000_enable_mng_pass_thru(hw);
  
  	/* initialize eeprom parameters */
  	if (e1000_init_eeprom_params(hw)) {
  		e_err(probe, "EEPROM initialization failed\n");
  		goto err_eeprom;
  	}
  
  	/* before reading the EEPROM, reset the controller to
  	 * put the device in a known good starting state
  	 */
  
  	e1000_reset_hw(hw);
  
  	/* make sure the EEPROM is good */
  	if (e1000_validate_eeprom_checksum(hw) < 0) {
  		e_err(probe, "The EEPROM Checksum Is Not Valid\n");
  		e1000_dump_eeprom(adapter);
  		/* set MAC address to all zeroes to invalidate and temporary
  		 * disable this device for the user. This blocks regular
  		 * traffic while still permitting ethtool ioctls from reaching
  		 * the hardware as well as allowing the user to run the
  		 * interface after manually setting a hw addr using
  		 * `ip set address`
  		 */
  		memset(hw->mac_addr, 0, netdev->addr_len);
  	} else {
  		/* copy the MAC address out of the EEPROM */
  		if (e1000_read_mac_addr(hw))
  			e_err(probe, "EEPROM Read Error\n");
  	}
  	/* don't block initialization here due to bad MAC address */
  	eth_hw_addr_set(netdev, hw->mac_addr);
  
  	if (!is_valid_ether_addr(netdev->dev_addr))
  		e_err(probe, "Invalid MAC Address\n");
  
  
  	INIT_DELAYED_WORK(&adapter->watchdog_task, e1000_watchdog);
  	INIT_DELAYED_WORK(&adapter->fifo_stall_task,
  			  e1000_82547_tx_fifo_stall_task);
  	INIT_DELAYED_WORK(&adapter->phy_info_task, e1000_update_phy_info_task);
  	INIT_WORK(&adapter->reset_task, e1000_reset_task);
  
  	e1000_check_options(adapter);
  
  	/* Initial Wake on LAN setting
  	 * If APM wake is enabled in the EEPROM,
  	 * enable the ACPI Magic Packet filter
  	 */
  
  	switch (hw->mac_type) {
  	case e1000_82542_rev2_0:
  	case e1000_82542_rev2_1:
  	case e1000_82543:
  		break;
  	case e1000_82544:
  		e1000_read_eeprom(hw,
  			EEPROM_INIT_CONTROL2_REG, 1, &eeprom_data);
  		eeprom_apme_mask = E1000_EEPROM_82544_APM;
  		break;
  	case e1000_82546:
  	case e1000_82546_rev_3:
  		if (er32(STATUS) & E1000_STATUS_FUNC_1) {
  			e1000_read_eeprom(hw,
  				EEPROM_INIT_CONTROL3_PORT_B, 1, &eeprom_data);
  			break;
  		}
  		fallthrough;
  	default:
  		e1000_read_eeprom(hw,
  			EEPROM_INIT_CONTROL3_PORT_A, 1, &eeprom_data);
  		break;
  	}
  	if (eeprom_data & eeprom_apme_mask)
  		adapter->eeprom_wol |= E1000_WUFC_MAG;
  
  	/* now that we have the eeprom settings, apply the special cases
  	 * where the eeprom may be wrong or the board simply won't support
  	 * wake on lan on a particular port
  	 */
  	switch (pdev->device) {
  	case E1000_DEV_ID_82546GB_PCIE:
  		adapter->eeprom_wol = 0;
  		break;
  	case E1000_DEV_ID_82546EB_FIBER:
  	case E1000_DEV_ID_82546GB_FIBER:
  		/* Wake events only supported on port A for dual fiber
  		 * regardless of eeprom setting
  		 */
  		if (er32(STATUS) & E1000_STATUS_FUNC_1)
  			adapter->eeprom_wol = 0;
  		break;
  	case E1000_DEV_ID_82546GB_QUAD_COPPER_KSP3:
  		/* if quad port adapter, disable WoL on all but port A */
  		if (global_quad_port_a != 0)
  			adapter->eeprom_wol = 0;
  		else
  			adapter->quad_port_a = true;
  		/* Reset for multiple quad port adapters */
  		if (++global_quad_port_a == 4)
  			global_quad_port_a = 0;
  		break;
  	}
  
  	/* initialize the wol settings based on the eeprom settings */
  	adapter->wol = adapter->eeprom_wol;
  	device_set_wakeup_enable(&adapter->pdev->dev, adapter->wol);
  
  	/* Auto detect PHY address */
  	if (hw->mac_type == e1000_ce4100) {
  		for (i = 0; i < 32; i++) {
  			hw->phy_addr = i;
  			e1000_read_phy_reg(hw, PHY_ID2, &tmp);
  
  			if (tmp != 0 && tmp != 0xFF)
  				break;
  		}
  
  		if (i >= 32)
  			goto err_eeprom;
  	}
  
  	/* reset the hardware with the new settings */
  	e1000_reset(adapter);
  
  	strcpy(netdev->name, "eth%d");
  	err = register_netdev(netdev);
  	if (err)
  		goto err_register;
  
  	e1000_vlan_filter_on_off(adapter, false);
  
  	/* print bus type/speed/width info */
  	e_info(probe, "(PCI%s:%dMHz:%d-bit) %pM\n",
  	       ((hw->bus_type == e1000_bus_type_pcix) ? "-X" : ""),
  	       ((hw->bus_speed == e1000_bus_speed_133) ? 133 :
  		(hw->bus_speed == e1000_bus_speed_120) ? 120 :
  		(hw->bus_speed == e1000_bus_speed_100) ? 100 :
  		(hw->bus_speed == e1000_bus_speed_66) ? 66 : 33),
  	       ((hw->bus_width == e1000_bus_width_64) ? 64 : 32),
  	       netdev->dev_addr);
  
  	/* carrier off reporting is important to ethtool even BEFORE open */
  	netif_carrier_off(netdev);
  
  	e_info(probe, "Intel(R) PRO/1000 Network Connection\n");
  
  	cards_found++;
  	return 0;
  
  err_register:
  err_eeprom:
  	e1000_phy_hw_reset(hw);
  
  	if (hw->flash_address)
  		iounmap(hw->flash_address);
  	kfree(adapter->tx_ring);
  	kfree(adapter->rx_ring);
  err_dma:
  err_sw_init:
  err_mdio_ioremap:
  	iounmap(hw->ce4100_gbe_mdio_base_virt);
  	iounmap(hw->hw_addr);
  err_ioremap:
  	disable_dev = !test_and_set_bit(__E1000_DISABLED, &adapter->flags);
  	free_netdev(netdev);
  err_alloc_etherdev:
  	pci_release_selected_regions(pdev, bars);
  err_pci_reg:
  	if (!adapter || disable_dev)
  		pci_disable_device(pdev);
  	return err;
  }
  
  /**
   * e1000_remove - Device Removal Routine
   * @pdev: PCI device information struct
   *
   * e1000_remove is called by the PCI subsystem to alert the driver
   * that it should release a PCI device. That could be caused by a
   * Hot-Plug event, or because the driver is going to be removed from
   * memory.
   **/
  static void e1000_remove(struct pci_dev *pdev)
  {
  	struct net_device *netdev = pci_get_drvdata(pdev);
  	struct e1000_adapter *adapter = netdev_priv(netdev);
  	struct e1000_hw *hw = &adapter->hw;
  	bool disable_dev;
  
  	e1000_down_and_stop(adapter);
  	e1000_release_manageability(adapter);
  
  	unregister_netdev(netdev);
  
  	e1000_phy_hw_reset(hw);
  
  	kfree(adapter->tx_ring);
  	kfree(adapter->rx_ring);
  
  	if (hw->mac_type == e1000_ce4100)
  		iounmap(hw->ce4100_gbe_mdio_base_virt);
  	iounmap(hw->hw_addr);
  	if (hw->flash_address)
  		iounmap(hw->flash_address);
  	pci_release_selected_regions(pdev, adapter->bars);
  
  	disable_dev = !test_and_set_bit(__E1000_DISABLED, &adapter->flags);
  	free_netdev(netdev);
  
  	if (disable_dev)
  		pci_disable_device(pdev);
  }
  
  /**
   * e1000_sw_init - Initialize general software structures (struct e1000_adapter)
   * @adapter: board private structure to initialize
   *
   * e1000_sw_init initializes the Adapter private data structure.
   * e1000_init_hw_struct MUST be called before this function
   **/
  static int e1000_sw_init(struct e1000_adapter *adapter)
  {
  	adapter->rx_buffer_len = MAXIMUM_ETHERNET_VLAN_SIZE;
  
  	adapter->num_tx_queues = 1;
  	adapter->num_rx_queues = 1;
  
  	if (e1000_alloc_queues(adapter)) {
  		e_err(probe, "Unable to allocate memory for queues\n");
  		return -ENOMEM;
  	}
  
  	/* Explicitly disable IRQ since the NIC can be in any state. */
  	e1000_irq_disable(adapter);
  
  	spin_lock_init(&adapter->stats_lock);
  
  	set_bit(__E1000_DOWN, &adapter->flags);
  
  	return 0;
  }
  
  /**
   * e1000_alloc_queues - Allocate memory for all rings
   * @adapter: board private structure to initialize
   *
   * We allocate one ring per queue at run-time since we don't know the
   * number of queues at compile-time.
   **/
  static int e1000_alloc_queues(struct e1000_adapter *adapter)
  {
  	adapter->tx_ring = kcalloc(adapter->num_tx_queues,
  				   sizeof(struct e1000_tx_ring), GFP_KERNEL);
  	if (!adapter->tx_ring)
  		return -ENOMEM;
  
  	adapter->rx_ring = kcalloc(adapter->num_rx_queues,
  				   sizeof(struct e1000_rx_ring), GFP_KERNEL);
  	if (!adapter->rx_ring) {
  		kfree(adapter->tx_ring);
  		return -ENOMEM;
  	}
  
  	return E1000_SUCCESS;
  }
  
  /**
   * e1000_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 task is started,
   * and the stack is notified that the interface is ready.
   **/
  int e1000_open(struct net_device *netdev)
  {
  	struct e1000_adapter *adapter = netdev_priv(netdev);
  	struct e1000_hw *hw = &adapter->hw;
  	int err;
  
  	/* disallow open during test */
  	if (test_bit(__E1000_TESTING, &adapter->flags))
  		return -EBUSY;
  
  	netif_carrier_off(netdev);
  
  	/* allocate transmit descriptors */
  	err = e1000_setup_all_tx_resources(adapter);
  	if (err)
  		goto err_setup_tx;
  
  	/* allocate receive descriptors */
  	err = e1000_setup_all_rx_resources(adapter);
  	if (err)
  		goto err_setup_rx;
  
  	e1000_power_up_phy(adapter);
  
  	adapter->mng_vlan_id = E1000_MNG_VLAN_NONE;
  	if ((hw->mng_cookie.status &
  			  E1000_MNG_DHCP_COOKIE_STATUS_VLAN_SUPPORT)) {
  		e1000_update_mng_vlan(adapter);
  	}
  
  	/* before we allocate an interrupt, we must be ready to handle it.
  	 * Setting DEBUG_SHIRQ in the kernel makes it fire an interrupt
  	 * as soon as we call pci_request_irq, so we have to setup our
  	 * clean_rx handler before we do so.
  	 */
  	e1000_configure(adapter);
  
  	err = e1000_request_irq(adapter);
  	if (err)
  		goto err_req_irq;
  
  	/* From here on the code is the same as e1000_up() */
  	clear_bit(__E1000_DOWN, &adapter->flags);
  
  	napi_enable(&adapter->napi);
  
  	e1000_irq_enable(adapter);
  
  	netif_start_queue(netdev);
  
  	/* fire a link status change interrupt to start the watchdog */
  	ew32(ICS, E1000_ICS_LSC);
  
  	return E1000_SUCCESS;
  
  err_req_irq:
  	e1000_power_down_phy(adapter);
  	e1000_free_all_rx_resources(adapter);
  err_setup_rx:
  	e1000_free_all_tx_resources(adapter);
  err_setup_tx:
  	e1000_reset(adapter);
  
  	return err;
  }
  
  /**
   * e1000_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.
   **/
  int e1000_close(struct net_device *netdev)
  {
  	struct e1000_adapter *adapter = netdev_priv(netdev);
  	struct e1000_hw *hw = &adapter->hw;
  	int count = E1000_CHECK_RESET_COUNT;
  
  	while (test_and_set_bit(__E1000_RESETTING, &adapter->flags) && count--)
  		usleep_range(10000, 20000);
  
  	WARN_ON(count < 0);
  
  	/* signal that we're down so that the reset task will no longer run */
  	set_bit(__E1000_DOWN, &adapter->flags);
  	clear_bit(__E1000_RESETTING, &adapter->flags);
  
  	e1000_down(adapter);
  	e1000_power_down_phy(adapter);
  	e1000_free_irq(adapter);
  
  	e1000_free_all_tx_resources(adapter);
  	e1000_free_all_rx_resources(adapter);
  
  	/* kill manageability vlan ID if supported, but not if a vlan with
  	 * the same ID is registered on the host OS (let 8021q kill it)
  	 */
  	if ((hw->mng_cookie.status &
  	     E1000_MNG_DHCP_COOKIE_STATUS_VLAN_SUPPORT) &&
  	    !test_bit(adapter->mng_vlan_id, adapter->active_vlans)) {
  		e1000_vlan_rx_kill_vid(netdev, htons(ETH_P_8021Q),
  				       adapter->mng_vlan_id);
  	}
  
  	return 0;
  }
  
  /**
   * e1000_check_64k_bound - check that memory doesn't cross 64kB boundary
   * @adapter: address of board private structure
   * @start: address of beginning of memory
   * @len: length of memory
   **/
  static bool e1000_check_64k_bound(struct e1000_adapter *adapter, void *start,
  				  unsigned long len)
  {
  	struct e1000_hw *hw = &adapter->hw;
  	unsigned long begin = (unsigned long)start;
  	unsigned long end = begin + len;
  
  	/* First rev 82545 and 82546 need to not allow any memory
  	 * write location to cross 64k boundary due to errata 23
  	 */
  	if (hw->mac_type == e1000_82545 ||
  	    hw->mac_type == e1000_ce4100 ||
  	    hw->mac_type == e1000_82546) {
  		return ((begin ^ (end - 1)) >> 16) == 0;
  	}
  
  	return true;
  }
  
  /**
   * e1000_setup_tx_resources - allocate Tx resources (Descriptors)
   * @adapter: board private structure
   * @txdr:    tx descriptor ring (for a specific queue) to setup
   *
   * Return 0 on success, negative on failure
   **/
  static int e1000_setup_tx_resources(struct e1000_adapter *adapter,
  				    struct e1000_tx_ring *txdr)
  {
  	struct pci_dev *pdev = adapter->pdev;
  	int size;
  
  	size = sizeof(struct e1000_tx_buffer) * txdr->count;
  	txdr->buffer_info = vzalloc(size);
  	if (!txdr->buffer_info)
  		return -ENOMEM;
  
  	/* round up to nearest 4K */
  
  	txdr->size = txdr->count * sizeof(struct e1000_tx_desc);
  	txdr->size = ALIGN(txdr->size, 4096);
  
  	txdr->desc = dma_alloc_coherent(&pdev->dev, txdr->size, &txdr->dma,
  					GFP_KERNEL);
  	if (!txdr->desc) {
  setup_tx_desc_die:
  		vfree(txdr->buffer_info);
  		return -ENOMEM;
  	}
  
  	/* Fix for errata 23, can't cross 64kB boundary */
  	if (!e1000_check_64k_bound(adapter, txdr->desc, txdr->size)) {
  		void *olddesc = txdr->desc;
  		dma_addr_t olddma = txdr->dma;
  		e_err(tx_err, "txdr align check failed: %u bytes at %p\n",
  		      txdr->size, txdr->desc);
  		/* Try again, without freeing the previous */
  		txdr->desc = dma_alloc_coherent(&pdev->dev, txdr->size,
  						&txdr->dma, GFP_KERNEL);
  		/* Failed allocation, critical failure */
  		if (!txdr->desc) {
  			dma_free_coherent(&pdev->dev, txdr->size, olddesc,
  					  olddma);
  			goto setup_tx_desc_die;
  		}
  
  		if (!e1000_check_64k_bound(adapter, txdr->desc, txdr->size)) {
  			/* give up */
  			dma_free_coherent(&pdev->dev, txdr->size, txdr->desc,
  					  txdr->dma);
  			dma_free_coherent(&pdev->dev, txdr->size, olddesc,
  					  olddma);
  			e_err(probe, "Unable to allocate aligned memory "
  			      "for the transmit descriptor ring\n");
  			vfree(txdr->buffer_info);
  			return -ENOMEM;
  		} else {
  			/* Free old allocation, new allocation was successful */
  			dma_free_coherent(&pdev->dev, txdr->size, olddesc,
  					  olddma);
  		}
  	}
  	memset(txdr->desc, 0, txdr->size);
  
  	txdr->next_to_use = 0;
  	txdr->next_to_clean = 0;
  
  	return 0;
  }
  
  /**
   * e1000_setup_all_tx_resources - wrapper to allocate Tx resources
   * 				  (Descriptors) for all queues
   * @adapter: board private structure
   *
   * Return 0 on success, negative on failure
   **/
  int e1000_setup_all_tx_resources(struct e1000_adapter *adapter)
  {
  	int i, err = 0;
  
  	for (i = 0; i < adapter->num_tx_queues; i++) {
  		err = e1000_setup_tx_resources(adapter, &adapter->tx_ring[i]);
  		if (err) {
  			e_err(probe, "Allocation for Tx Queue %u failed\n", i);
  			for (i-- ; i >= 0; i--)
  				e1000_free_tx_resources(adapter,
  							&adapter->tx_ring[i]);
  			break;
  		}
  	}
  
  	return err;
  }
  
  /**
   * e1000_configure_tx - Configure 8254x Transmit Unit after Reset
   * @adapter: board private structure
   *
   * Configure the Tx unit of the MAC after a reset.
   **/
  static void e1000_configure_tx(struct e1000_adapter *adapter)
  {
  	u64 tdba;
  	struct e1000_hw *hw = &adapter->hw;
  	u32 tdlen, tctl, tipg;
  	u32 ipgr1, ipgr2;
  
  	/* Setup the HW Tx Head and Tail descriptor pointers */
  
  	switch (adapter->num_tx_queues) {
  	case 1:
  	default:
  		tdba = adapter->tx_ring[0].dma;
  		tdlen = adapter->tx_ring[0].count *
  			sizeof(struct e1000_tx_desc);
  		ew32(TDLEN, tdlen);
  		ew32(TDBAH, (tdba >> 32));
  		ew32(TDBAL, (tdba & 0x00000000ffffffffULL));
  		ew32(TDT, 0);
  		ew32(TDH, 0);
  		adapter->tx_ring[0].tdh = ((hw->mac_type >= e1000_82543) ?
  					   E1000_TDH : E1000_82542_TDH);
  		adapter->tx_ring[0].tdt = ((hw->mac_type >= e1000_82543) ?
  					   E1000_TDT : E1000_82542_TDT);
  		break;
  	}
  
  	/* Set the default values for the Tx Inter Packet Gap timer */
  	if ((hw->media_type == e1000_media_type_fiber ||
  	     hw->media_type == e1000_media_type_internal_serdes))
  		tipg = DEFAULT_82543_TIPG_IPGT_FIBER;
  	else
  		tipg = DEFAULT_82543_TIPG_IPGT_COPPER;
  
  	switch (hw->mac_type) {
  	case e1000_82542_rev2_0:
  	case e1000_82542_rev2_1:
  		tipg = DEFAULT_82542_TIPG_IPGT;
  		ipgr1 = DEFAULT_82542_TIPG_IPGR1;
  		ipgr2 = DEFAULT_82542_TIPG_IPGR2;
  		break;
  	default:
  		ipgr1 = DEFAULT_82543_TIPG_IPGR1;
  		ipgr2 = DEFAULT_82543_TIPG_IPGR2;
  		break;
  	}
  	tipg |= ipgr1 << E1000_TIPG_IPGR1_SHIFT;
  	tipg |= ipgr2 << E1000_TIPG_IPGR2_SHIFT;
  	ew32(TIPG, tipg);
  
  	/* Set the Tx Interrupt Delay register */
  
  	ew32(TIDV, adapter->tx_int_delay);
  	if (hw->mac_type >= e1000_82540)
  		ew32(TADV, adapter->tx_abs_int_delay);
  
  	/* Program the Transmit Control Register */
  
  	tctl = er32(TCTL);
  	tctl &= ~E1000_TCTL_CT;
  	tctl |= E1000_TCTL_PSP | E1000_TCTL_RTLC |
  		(E1000_COLLISION_THRESHOLD << E1000_CT_SHIFT);
  
  	e1000_config_collision_dist(hw);
  
  	/* Setup Transmit Descriptor Settings for eop descriptor */
  	adapter->txd_cmd = E1000_TXD_CMD_EOP | E1000_TXD_CMD_IFCS;
  
  	/* only set IDE if we are delaying interrupts using the timers */
  	if (adapter->tx_int_delay)
  		adapter->txd_cmd |= E1000_TXD_CMD_IDE;
  
  	if (hw->mac_type < e1000_82543)
  		adapter->txd_cmd |= E1000_TXD_CMD_RPS;
  	else
  		adapter->txd_cmd |= E1000_TXD_CMD_RS;
  
  	/* Cache if we're 82544 running in PCI-X because we'll
  	 * need this to apply a workaround later in the send path.
  	 */
  	if (hw->mac_type == e1000_82544 &&
  	    hw->bus_type == e1000_bus_type_pcix)
  		adapter->pcix_82544 = true;
  
  	ew32(TCTL, tctl);
  
  }
  
  /**
   * e1000_setup_rx_resources - allocate Rx resources (Descriptors)
   * @adapter: board private structure
   * @rxdr:    rx descriptor ring (for a specific queue) to setup
   *
   * Returns 0 on success, negative on failure
   **/
  static int e1000_setup_rx_resources(struct e1000_adapter *adapter,
  				    struct e1000_rx_ring *rxdr)
  {
  	struct pci_dev *pdev = adapter->pdev;
  	int size, desc_len;
  
  	size = sizeof(struct e1000_rx_buffer) * rxdr->count;
  	rxdr->buffer_info = vzalloc(size);
  	if (!rxdr->buffer_info)
  		return -ENOMEM;
  
  	desc_len = sizeof(struct e1000_rx_desc);
  
  	/* Round up to nearest 4K */
  
  	rxdr->size = rxdr->count * desc_len;
  	rxdr->size = ALIGN(rxdr->size, 4096);
  
  	rxdr->desc = dma_alloc_coherent(&pdev->dev, rxdr->size, &rxdr->dma,
  					GFP_KERNEL);
  	if (!rxdr->desc) {
  setup_rx_desc_die:
  		vfree(rxdr->buffer_info);
  		return -ENOMEM;
  	}
  
  	/* Fix for errata 23, can't cross 64kB boundary */
  	if (!e1000_check_64k_bound(adapter, rxdr->desc, rxdr->size)) {
  		void *olddesc = rxdr->desc;
  		dma_addr_t olddma = rxdr->dma;
  		e_err(rx_err, "rxdr align check failed: %u bytes at %p\n",
  		      rxdr->size, rxdr->desc);
  		/* Try again, without freeing the previous */
  		rxdr->desc = dma_alloc_coherent(&pdev->dev, rxdr->size,
  						&rxdr->dma, GFP_KERNEL);
  		/* Failed allocation, critical failure */
  		if (!rxdr->desc) {
  			dma_free_coherent(&pdev->dev, rxdr->size, olddesc,
  					  olddma);
  			goto setup_rx_desc_die;
  		}
  
  		if (!e1000_check_64k_bound(adapter, rxdr->desc, rxdr->size)) {
  			/* give up */
  			dma_free_coherent(&pdev->dev, rxdr->size, rxdr->desc,
  					  rxdr->dma);
  			dma_free_coherent(&pdev->dev, rxdr->size, olddesc,
  					  olddma);
  			e_err(probe, "Unable to allocate aligned memory for "
  			      "the Rx descriptor ring\n");
  			goto setup_rx_desc_die;
  		} else {
  			/* Free old allocation, new allocation was successful */
  			dma_free_coherent(&pdev->dev, rxdr->size, olddesc,
  					  olddma);
  		}
  	}
  	memset(rxdr->desc, 0, rxdr->size);
  
  	rxdr->next_to_clean = 0;
  	rxdr->next_to_use = 0;
  	rxdr->rx_skb_top = NULL;
  
  	return 0;
  }
  
  /**
   * e1000_setup_all_rx_resources - wrapper to allocate Rx resources
   * 				  (Descriptors) for all queues
   * @adapter: board private structure
   *
   * Return 0 on success, negative on failure
   **/
  int e1000_setup_all_rx_resources(struct e1000_adapter *adapter)
  {
  	int i, err = 0;
  
  	for (i = 0; i < adapter->num_rx_queues; i++) {
  		err = e1000_setup_rx_resources(adapter, &adapter->rx_ring[i]);
  		if (err) {
  			e_err(probe, "Allocation for Rx Queue %u failed\n", i);
  			for (i-- ; i >= 0; i--)
  				e1000_free_rx_resources(adapter,
  							&adapter->rx_ring[i]);
  			break;
  		}
  	}
  
  	return err;
  }
  
  /**
   * e1000_setup_rctl - configure the receive control registers
   * @adapter: Board private structure
   **/
  static void e1000_setup_rctl(struct e1000_adapter *adapter)
  {
  	struct e1000_hw *hw = &adapter->hw;
  	u32 rctl;
  
  	rctl = er32(RCTL);
  
  	rctl &= ~(3 << E1000_RCTL_MO_SHIFT);
  
  	rctl |= E1000_RCTL_BAM | E1000_RCTL_LBM_NO |
  		E1000_RCTL_RDMTS_HALF |
  		(hw->mc_filter_type << E1000_RCTL_MO_SHIFT);
  
  	if (hw->tbi_compatibility_on == 1)
  		rctl |= E1000_RCTL_SBP;
  	else
  		rctl &= ~E1000_RCTL_SBP;
  
  	if (adapter->netdev->mtu <= ETH_DATA_LEN)
  		rctl &= ~E1000_RCTL_LPE;
  	else
  		rctl |= E1000_RCTL_LPE;
  
  	/* Setup buffer sizes */
  	rctl &= ~E1000_RCTL_SZ_4096;
  	rctl |= E1000_RCTL_BSEX;
  	switch (adapter->rx_buffer_len) {
  	case E1000_RXBUFFER_2048:
  	default:
  		rctl |= E1000_RCTL_SZ_2048;
  		rctl &= ~E1000_RCTL_BSEX;
  		break;
  	case E1000_RXBUFFER_4096:
  		rctl |= E1000_RCTL_SZ_4096;
  		break;
  	case E1000_RXBUFFER_8192:
  		rctl |= E1000_RCTL_SZ_8192;
  		break;
  	case E1000_RXBUFFER_16384:
  		rctl |= E1000_RCTL_SZ_16384;
  		break;
  	}
  
  	/* This is useful for sniffing bad packets. */
  	if (adapter->netdev->features & NETIF_F_RXALL) {
  		/* UPE and MPE will be handled by normal PROMISC logic
  		 * in e1000e_set_rx_mode
  		 */
  		rctl |= (E1000_RCTL_SBP | /* Receive bad packets */
  			 E1000_RCTL_BAM | /* RX All Bcast Pkts */
  			 E1000_RCTL_PMCF); /* RX All MAC Ctrl Pkts */
  
  		rctl &= ~(E1000_RCTL_VFE | /* Disable VLAN filter */
  			  E1000_RCTL_DPF | /* Allow filtered pause */
  			  E1000_RCTL_CFIEN); /* Dis VLAN CFIEN Filter */
  		/* Do not mess with E1000_CTRL_VME, it affects transmit as well,
  		 * and that breaks VLANs.
  		 */
  	}
  
  	ew32(RCTL, rctl);
  }
  
  /**
   * e1000_configure_rx - Configure 8254x Receive Unit after Reset
   * @adapter: board private structure
   *
   * Configure the Rx unit of the MAC after a reset.
   **/
  static void e1000_configure_rx(struct e1000_adapter *adapter)
  {
  	u64 rdba;
  	struct e1000_hw *hw = &adapter->hw;
  	u32 rdlen, rctl, rxcsum;
  
  	if (adapter->netdev->mtu > ETH_DATA_LEN) {
  		rdlen = adapter->rx_ring[0].count *
  			sizeof(struct e1000_rx_desc);
  		adapter->clean_rx = e1000_clean_jumbo_rx_irq;
  		adapter->alloc_rx_buf = e1000_alloc_jumbo_rx_buffers;
  	} else {
  		rdlen = adapter->rx_ring[0].count *
  			sizeof(struct e1000_rx_desc);
  		adapter->clean_rx = e1000_clean_rx_irq;
  		adapter->alloc_rx_buf = e1000_alloc_rx_buffers;
  	}
  
  	/* disable receives while setting up the descriptors */
  	rctl = er32(RCTL);
  	ew32(RCTL, rctl & ~E1000_RCTL_EN);
  
  	/* set the Receive Delay Timer Register */
  	ew32(RDTR, adapter->rx_int_delay);
  
  	if (hw->mac_type >= e1000_82540) {
  		ew32(RADV, adapter->rx_abs_int_delay);
  		if (adapter->itr_setting != 0)
  			ew32(ITR, 1000000000 / (adapter->itr * 256));
  	}
  
  	/* Setup the HW Rx Head and Tail Descriptor Pointers and
  	 * the Base and Length of the Rx Descriptor Ring
  	 */
  	switch (adapter->num_rx_queues) {
  	case 1:
  	default:
  		rdba = adapter->rx_ring[0].dma;
  		ew32(RDLEN, rdlen);
  		ew32(RDBAH, (rdba >> 32));
  		ew32(RDBAL, (rdba & 0x00000000ffffffffULL));
  		ew32(RDT, 0);
  		ew32(RDH, 0);
  		adapter->rx_ring[0].rdh = ((hw->mac_type >= e1000_82543) ?
  					   E1000_RDH : E1000_82542_RDH);
  		adapter->rx_ring[0].rdt = ((hw->mac_type >= e1000_82543) ?
  					   E1000_RDT : E1000_82542_RDT);
  		break;
  	}
  
  	/* Enable 82543 Receive Checksum Offload for TCP and UDP */
  	if (hw->mac_type >= e1000_82543) {
  		rxcsum = er32(RXCSUM);
  		if (adapter->rx_csum)
  			rxcsum |= E1000_RXCSUM_TUOFL;
  		else
  			/* don't need to clear IPPCSE as it defaults to 0 */
  			rxcsum &= ~E1000_RXCSUM_TUOFL;
  		ew32(RXCSUM, rxcsum);
  	}
  
  	/* Enable Receives */
  	ew32(RCTL, rctl | E1000_RCTL_EN);
  }
  
  /**
   * e1000_free_tx_resources - Free Tx Resources per Queue
   * @adapter: board private structure
   * @tx_ring: Tx descriptor ring for a specific queue
   *
   * Free all transmit software resources
   **/
  static void e1000_free_tx_resources(struct e1000_adapter *adapter,
  				    struct e1000_tx_ring *tx_ring)
  {
  	struct pci_dev *pdev = adapter->pdev;
  
  	e1000_clean_tx_ring(adapter, tx_ring);
  
  	vfree(tx_ring->buffer_info);
  	tx_ring->buffer_info = NULL;
  
  	dma_free_coherent(&pdev->dev, tx_ring->size, tx_ring->desc,
  			  tx_ring->dma);
  
  	tx_ring->desc = NULL;
  }
  
  /**
   * e1000_free_all_tx_resources - Free Tx Resources for All Queues
   * @adapter: board private structure
   *
   * Free all transmit software resources
   **/
  void e1000_free_all_tx_resources(struct e1000_adapter *adapter)
  {
  	int i;
  
  	for (i = 0; i < adapter->num_tx_queues; i++)
  		e1000_free_tx_resources(adapter, &adapter->tx_ring[i]);
  }
  
  static void
  e1000_unmap_and_free_tx_resource(struct e1000_adapter *adapter,
  				 struct e1000_tx_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;
  	/* buffer_info must be completely set up in the transmit path */
  }
  
  /**
   * e1000_clean_tx_ring - Free Tx Buffers
   * @adapter: board private structure
   * @tx_ring: ring to be cleaned
   **/
  static void e1000_clean_tx_ring(struct e1000_adapter *adapter,
  				struct e1000_tx_ring *tx_ring)
  {
  	struct e1000_hw *hw = &adapter->hw;
  	struct e1000_tx_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];
  		e1000_unmap_and_free_tx_resource(adapter, buffer_info);
  	}
  
  	netdev_reset_queue(adapter->netdev);
  	size = sizeof(struct e1000_tx_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;
  	tx_ring->last_tx_tso = false;
  
  	writel(0, hw->hw_addr + tx_ring->tdh);
  	writel(0, hw->hw_addr + tx_ring->tdt);
  }
  
  /**
   * e1000_clean_all_tx_rings - Free Tx Buffers for all queues
   * @adapter: board private structure
   **/
  static void e1000_clean_all_tx_rings(struct e1000_adapter *adapter)
  {
  	int i;
  
  	for (i = 0; i < adapter->num_tx_queues; i++)
  		e1000_clean_tx_ring(adapter, &adapter->tx_ring[i]);
  }
  
  /**
   * e1000_free_rx_resources - Free Rx Resources
   * @adapter: board private structure
   * @rx_ring: ring to clean the resources from
   *
   * Free all receive software resources
   **/
  static void e1000_free_rx_resources(struct e1000_adapter *adapter,
  				    struct e1000_rx_ring *rx_ring)
  {
  	struct pci_dev *pdev = adapter->pdev;
  
  	e1000_clean_rx_ring(adapter, rx_ring);
  
  	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;
  }
  
  /**
   * e1000_free_all_rx_resources - Free Rx Resources for All Queues
   * @adapter: board private structure
   *
   * Free all receive software resources
   **/
  void e1000_free_all_rx_resources(struct e1000_adapter *adapter)
  {
  	int i;
  
  	for (i = 0; i < adapter->num_rx_queues; i++)
  		e1000_free_rx_resources(adapter, &adapter->rx_ring[i]);
  }
  
  #define E1000_HEADROOM (NET_SKB_PAD + NET_IP_ALIGN)
  static unsigned int e1000_frag_len(const struct e1000_adapter *a)
  {
  	return SKB_DATA_ALIGN(a->rx_buffer_len + E1000_HEADROOM) +
  		SKB_DATA_ALIGN(sizeof(struct skb_shared_info));
  }
  
  static void *e1000_alloc_frag(const struct e1000_adapter *a)
  {
  	unsigned int len = e1000_frag_len(a);
  	u8 *data = netdev_alloc_frag(len);
  
  	if (likely(data))
  		data += E1000_HEADROOM;
  	return data;
  }
  
  /**
   * e1000_clean_rx_ring - Free Rx Buffers per Queue
   * @adapter: board private structure
   * @rx_ring: ring to free buffers from
   **/
  static void e1000_clean_rx_ring(struct e1000_adapter *adapter,
  				struct e1000_rx_ring *rx_ring)
  {
  	struct e1000_hw *hw = &adapter->hw;
  	struct e1000_rx_buffer *buffer_info;
  	struct pci_dev *pdev = adapter->pdev;
  	unsigned long size;
  	unsigned int i;
  
  	/* Free all the Rx netfrags */
  	for (i = 0; i < rx_ring->count; i++) {
  		buffer_info = &rx_ring->buffer_info[i];
  		if (adapter->clean_rx == e1000_clean_rx_irq) {
  			if (buffer_info->dma)
  				dma_unmap_single(&pdev->dev, buffer_info->dma,
  						 adapter->rx_buffer_len,
  						 DMA_FROM_DEVICE);
  			if (buffer_info->rxbuf.data) {
  				skb_free_frag(buffer_info->rxbuf.data);
  				buffer_info->rxbuf.data = NULL;
  			}
  		} else if (adapter->clean_rx == e1000_clean_jumbo_rx_irq) {
  			if (buffer_info->dma)
  				dma_unmap_page(&pdev->dev, buffer_info->dma,
  					       adapter->rx_buffer_len,
  					       DMA_FROM_DEVICE);
  			if (buffer_info->rxbuf.page) {
  				put_page(buffer_info->rxbuf.page);
  				buffer_info->rxbuf.page = NULL;
  			}
  		}
  
  		buffer_info->dma = 0;
  	}
  
  	/* there also may be some cached data from a chained receive */
  	napi_free_frags(&adapter->napi);
  	rx_ring->rx_skb_top = NULL;
  
  	size = sizeof(struct e1000_rx_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;
  
  	writel(0, hw->hw_addr + rx_ring->rdh);
  	writel(0, hw->hw_addr + rx_ring->rdt);
  }
  
  /**
   * e1000_clean_all_rx_rings - Free Rx Buffers for all queues
   * @adapter: board private structure
   **/
  static void e1000_clean_all_rx_rings(struct e1000_adapter *adapter)
  {
  	int i;
  
  	for (i = 0; i < adapter->num_rx_queues; i++)
  		e1000_clean_rx_ring(adapter, &adapter->rx_ring[i]);
  }
  
  /* The 82542 2.0 (revision 2) needs to have the receive unit in reset
   * and memory write and invalidate disabled for certain operations
   */
  static void e1000_enter_82542_rst(struct e1000_adapter *adapter)
  {
  	struct e1000_hw *hw = &adapter->hw;
  	struct net_device *netdev = adapter->netdev;
  	u32 rctl;
  
  	e1000_pci_clear_mwi(hw);
  
  	rctl = er32(RCTL);
  	rctl |= E1000_RCTL_RST;
  	ew32(RCTL, rctl);
  	E1000_WRITE_FLUSH();
  	mdelay(5);
  
  	if (netif_running(netdev))
  		e1000_clean_all_rx_rings(adapter);
  }
  
  static void e1000_leave_82542_rst(struct e1000_adapter *adapter)
  {
  	struct e1000_hw *hw = &adapter->hw;
  	struct net_device *netdev = adapter->netdev;
  	u32 rctl;
  
  	rctl = er32(RCTL);
  	rctl &= ~E1000_RCTL_RST;
  	ew32(RCTL, rctl);
  	E1000_WRITE_FLUSH();
  	mdelay(5);
  
  	if (hw->pci_cmd_word & PCI_COMMAND_INVALIDATE)
  		e1000_pci_set_mwi(hw);
  
  	if (netif_running(netdev)) {
  		/* No need to loop, because 82542 supports only 1 queue */
  		struct e1000_rx_ring *ring = &adapter->rx_ring[0];
  		e1000_configure_rx(adapter);
  		adapter->alloc_rx_buf(adapter, ring, E1000_DESC_UNUSED(ring));
  	}
  }
  
  /**
   * e1000_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 e1000_set_mac(struct net_device *netdev, void *p)
  {
  	struct e1000_adapter *adapter = netdev_priv(netdev);
  	struct e1000_hw *hw = &adapter->hw;
  	struct sockaddr *addr = p;
  
  	if (!is_valid_ether_addr(addr->sa_data))
  		return -EADDRNOTAVAIL;
  
  	/* 82542 2.0 needs to be in reset to write receive address registers */
  
  	if (hw->mac_type == e1000_82542_rev2_0)
  		e1000_enter_82542_rst(adapter);
  
  	eth_hw_addr_set(netdev, addr->sa_data);
  	memcpy(hw->mac_addr, addr->sa_data, netdev->addr_len);
  
  	e1000_rar_set(hw, hw->mac_addr, 0);
  
  	if (hw->mac_type == e1000_82542_rev2_0)
  		e1000_leave_82542_rst(adapter);
  
  	return 0;
  }
  
  /**
   * e1000_set_rx_mode - Secondary Unicast, Multicast and Promiscuous mode set
   * @netdev: network interface device structure
   *
   * The set_rx_mode entry point is called whenever the unicast or multicast
   * address lists or the network interface flags are updated. This routine is
   * responsible for configuring the hardware for proper unicast, multicast,
   * promiscuous mode, and all-multi behavior.
   **/
  static void e1000_set_rx_mode(struct net_device *netdev)
  {
  	struct e1000_adapter *adapter = netdev_priv(netdev);
  	struct e1000_hw *hw = &adapter->hw;
  	struct netdev_hw_addr *ha;
  	bool use_uc = false;
  	u32 rctl;
  	u32 hash_value;
  	int i, rar_entries = E1000_RAR_ENTRIES;
  	int mta_reg_count = E1000_NUM_MTA_REGISTERS;
  	u32 *mcarray = kcalloc(mta_reg_count, sizeof(u32), GFP_ATOMIC);
  
  	if (!mcarray)
  		return;
  
  	/* Check for Promiscuous and All Multicast modes */
  
  	rctl = er32(RCTL);
  
  	if (netdev->flags & IFF_PROMISC) {
  		rctl |= (E1000_RCTL_UPE | E1000_RCTL_MPE);
  		rctl &= ~E1000_RCTL_VFE;
  	} else {
  		if (netdev->flags & IFF_ALLMULTI)
  			rctl |= E1000_RCTL_MPE;
  		else
  			rctl &= ~E1000_RCTL_MPE;
  		/* Enable VLAN filter if there is a VLAN */
  		if (e1000_vlan_used(adapter))
  			rctl |= E1000_RCTL_VFE;
  	}
  
  	if (netdev_uc_count(netdev) > rar_entries - 1) {
  		rctl |= E1000_RCTL_UPE;
  	} else if (!(netdev->flags & IFF_PROMISC)) {
  		rctl &= ~E1000_RCTL_UPE;
  		use_uc = true;
  	}
  
  	ew32(RCTL, rctl);
  
  	/* 82542 2.0 needs to be in reset to write receive address registers */
  
  	if (hw->mac_type == e1000_82542_rev2_0)
  		e1000_enter_82542_rst(adapter);
  
  	/* load the first 14 addresses into the exact filters 1-14. Unicast
  	 * addresses take precedence to avoid disabling unicast filtering
  	 * when possible.
  	 *
  	 * RAR 0 is used for the station MAC address
  	 * if there are not 14 addresses, go ahead and clear the filters
  	 */
  	i = 1;
  	if (use_uc)
  		netdev_for_each_uc_addr(ha, netdev) {
  			if (i == rar_entries)
  				break;
  			e1000_rar_set(hw, ha->addr, i++);
  		}
  
  	netdev_for_each_mc_addr(ha, netdev) {
  		if (i == rar_entries) {
  			/* load any remaining addresses into the hash table */
  			u32 hash_reg, hash_bit, mta;
  			hash_value = e1000_hash_mc_addr(hw, ha->addr);
  			hash_reg = (hash_value >> 5) & 0x7F;
  			hash_bit = hash_value & 0x1F;
  			mta = (1 << hash_bit);
  			mcarray[hash_reg] |= mta;
  		} else {
  			e1000_rar_set(hw, ha->addr, i++);
  		}
  	}
  
  	for (; i < rar_entries; i++) {
  		E1000_WRITE_REG_ARRAY(hw, RA, i << 1, 0);
  		E1000_WRITE_FLUSH();
  		E1000_WRITE_REG_ARRAY(hw, RA, (i << 1) + 1, 0);
  		E1000_WRITE_FLUSH();
  	}
  
  	/* write the hash table completely, write from bottom to avoid
  	 * both stupid write combining chipsets, and flushing each write
  	 */
  	for (i = mta_reg_count - 1; i >= 0 ; i--) {
  		/* If we are on an 82544 has an errata where writing odd
  		 * offsets overwrites the previous even offset, but writing
  		 * backwards over the range solves the issue by always
  		 * writing the odd offset first
  		 */
  		E1000_WRITE_REG_ARRAY(hw, MTA, i, mcarray[i]);
  	}
  	E1000_WRITE_FLUSH();
  
  	if (hw->mac_type == e1000_82542_rev2_0)
  		e1000_leave_82542_rst(adapter);
  
  	kfree(mcarray);
  }
  
  /**
   * e1000_update_phy_info_task - get phy info
   * @work: work struct contained inside adapter struct
   *
   * Need to wait a few seconds after link up to get diagnostic information from
   * the phy
   */
  static void e1000_update_phy_info_task(struct work_struct *work)
  {
  	struct e1000_adapter *adapter = container_of(work,
  						     struct e1000_adapter,
  						     phy_info_task.work);
  
  	e1000_phy_get_info(&adapter->hw, &adapter->phy_info);
  }
  
  /**
   * e1000_82547_tx_fifo_stall_task - task to complete work
   * @work: work struct contained inside adapter struct
   **/
  static void e1000_82547_tx_fifo_stall_task(struct work_struct *work)
  {
  	struct e1000_adapter *adapter = container_of(work,
  						     struct e1000_adapter,
  						     fifo_stall_task.work);
  	struct e1000_hw *hw = &adapter->hw;
  	struct net_device *netdev = adapter->netdev;
  	u32 tctl;
  
  	if (atomic_read(&adapter->tx_fifo_stall)) {
  		if ((er32(TDT) == er32(TDH)) &&
  		   (er32(TDFT) == er32(TDFH)) &&
  		   (er32(TDFTS) == er32(TDFHS))) {
  			tctl = er32(TCTL);
  			ew32(TCTL, tctl & ~E1000_TCTL_EN);
  			ew32(TDFT, adapter->tx_head_addr);
  			ew32(TDFH, adapter->tx_head_addr);
  			ew32(TDFTS, adapter->tx_head_addr);
  			ew32(TDFHS, adapter->tx_head_addr);
  			ew32(TCTL, tctl);
  			E1000_WRITE_FLUSH();
  
  			adapter->tx_fifo_head = 0;
  			atomic_set(&adapter->tx_fifo_stall, 0);
  			netif_wake_queue(netdev);
  		} else if (!test_bit(__E1000_DOWN, &adapter->flags)) {
  			schedule_delayed_work(&adapter->fifo_stall_task, 1);
  		}
  	}
  }
  
  bool e1000_has_link(struct e1000_adapter *adapter)
  {
  	struct e1000_hw *hw = &adapter->hw;
  	bool link_active = false;
  
  	/* get_link_status is set on LSC (link status) interrupt or rx
  	 * sequence error interrupt (except on intel ce4100).
  	 * get_link_status will stay false until the
  	 * e1000_check_for_link establishes link for copper adapters
  	 * ONLY
  	 */
  	switch (hw->media_type) {
  	case e1000_media_type_copper:
  		if (hw->mac_type == e1000_ce4100)
  			hw->get_link_status = 1;
  		if (hw->get_link_status) {
  			e1000_check_for_link(hw);
  			link_active = !hw->get_link_status;
  		} else {
  			link_active = true;
  		}
  		break;
  	case e1000_media_type_fiber:
  		e1000_check_for_link(hw);
  		link_active = !!(er32(STATUS) & E1000_STATUS_LU);
  		break;
  	case e1000_media_type_internal_serdes:
  		e1000_check_for_link(hw);
  		link_active = hw->serdes_has_link;
  		break;
  	default:
  		break;
  	}
  
  	return link_active;
  }
  
  /**
   * e1000_watchdog - work function
   * @work: work struct contained inside adapter struct
   **/
  static void e1000_watchdog(struct work_struct *work)
  {
  	struct e1000_adapter *adapter = container_of(work,
  						     struct e1000_adapter,
  						     watchdog_task.work);
  	struct e1000_hw *hw = &adapter->hw;
  	struct net_device *netdev = adapter->netdev;
  	struct e1000_tx_ring *txdr = adapter->tx_ring;
  	u32 link, tctl;
  
  	link = e1000_has_link(adapter);
  	if ((netif_carrier_ok(netdev)) && link)
  		goto link_up;
  
  	if (link) {
  		if (!netif_carrier_ok(netdev)) {
  			u32 ctrl;
  			/* update snapshot of PHY registers on LSC */
  			e1000_get_speed_and_duplex(hw,
  						   &adapter->link_speed,
  						   &adapter->link_duplex);
  
  			ctrl = er32(CTRL);
  			pr_info("%s NIC Link is Up %d Mbps %s, "
  				"Flow Control: %s\n",
  				netdev->name,
  				adapter->link_speed,
  				adapter->link_duplex == FULL_DUPLEX ?
  				"Full Duplex" : "Half Duplex",
  				((ctrl & E1000_CTRL_TFCE) && (ctrl &
  				E1000_CTRL_RFCE)) ? "RX/TX" : ((ctrl &
  				E1000_CTRL_RFCE) ? "RX" : ((ctrl &
  				E1000_CTRL_TFCE) ? "TX" : "None")));
  
  			/* adjust timeout factor according to speed/duplex */
  			adapter->tx_timeout_factor = 1;
  			switch (adapter->link_speed) {
  			case SPEED_10:
  				adapter->tx_timeout_factor = 16;
  				break;
  			case SPEED_100:
  				/* maybe add some timeout factor ? */
  				break;
  			}
  
  			/* enable transmits in the hardware */
  			tctl = er32(TCTL);
  			tctl |= E1000_TCTL_EN;
  			ew32(TCTL, tctl);
  
  			netif_carrier_on(netdev);
  			if (!test_bit(__E1000_DOWN, &adapter->flags))
  				schedule_delayed_work(&adapter->phy_info_task,
  						      2 * HZ);
  			adapter->smartspeed = 0;
  		}
  	} else {
  		if (netif_carrier_ok(netdev)) {
  			adapter->link_speed = 0;
  			adapter->link_duplex = 0;
  			pr_info("%s NIC Link is Down\n",
  				netdev->name);
  			netif_carrier_off(netdev);
  
  			if (!test_bit(__E1000_DOWN, &adapter->flags))
  				schedule_delayed_work(&adapter->phy_info_task,
  						      2 * HZ);
  		}
  
  		e1000_smartspeed(adapter);
  	}
  
  link_up:
  	e1000_update_stats(adapter);
  
  	hw->tx_packet_delta = adapter->stats.tpt - adapter->tpt_old;
  	adapter->tpt_old = adapter->stats.tpt;
  	hw->collision_delta = adapter->stats.colc - adapter->colc_old;
  	adapter->colc_old = adapter->stats.colc;
  
  	adapter->gorcl = adapter->stats.gorcl - adapter->gorcl_old;
  	adapter->gorcl_old = adapter->stats.gorcl;
  	adapter->gotcl = adapter->stats.gotcl - adapter->gotcl_old;
  	adapter->gotcl_old = adapter->stats.gotcl;
  
  	e1000_update_adaptive(hw);
  
  	if (!netif_carrier_ok(netdev)) {
  		if (E1000_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).
  			 */
  			adapter->tx_timeout_count++;
  			schedule_work(&adapter->reset_task);
  			/* exit immediately since reset is imminent */
  			return;
  		}
  	}
  
  	/* Simple mode for Interrupt Throttle Rate (ITR) */
  	if (hw->mac_type >= e1000_82540 && adapter->itr_setting == 4) {
  		/* Symmetric Tx/Rx gets a reduced ITR=2000;
  		 * Total asymmetrical Tx or Rx gets ITR=8000;
  		 * everyone else is between 2000-8000.
  		 */
  		u32 goc = (adapter->gotcl + adapter->gorcl) / 10000;
  		u32 dif = (adapter->gotcl > adapter->gorcl ?
  			    adapter->gotcl - adapter->gorcl :
  			    adapter->gorcl - adapter->gotcl) / 10000;
  		u32 itr = goc > 0 ? (dif * 6000 / goc + 2000) : 8000;
  
  		ew32(ITR, 1000000000 / (itr * 256));
  	}
  
  	/* Cause software interrupt to ensure rx ring is cleaned */
  	ew32(ICS, E1000_ICS_RXDMT0);
  
  	/* Force detection of hung controller every watchdog period */
  	adapter->detect_tx_hung = true;
  
  	/* Reschedule the task */
  	if (!test_bit(__E1000_DOWN, &adapter->flags))
  		schedule_delayed_work(&adapter->watchdog_task, 2 * HZ);
  }
  
  enum latency_range {
  	lowest_latency = 0,
  	low_latency = 1,
  	bulk_latency = 2,
  	latency_invalid = 255
  };
  
  /**
   * e1000_update_itr - update the dynamic ITR value based on statistics
   * @adapter: pointer to adapter
   * @itr_setting: current adapter->itr
   * @packets: the number of packets during this measurement interval
   * @bytes: the number of bytes during this measurement interval
   *
   *      Stores a new ITR value based on packets and byte
   *      counts during the last interrupt.  The advantage of per interrupt
   *      computation is faster updates and more accurate ITR for the current
   *      traffic pattern.  Constants in this function were computed
   *      based on theoretical maximum wire speed and thresholds were set based
   *      on testing data as well as attempting to minimize response time
   *      while increasing bulk throughput.
   *      this functionality is controlled by the InterruptThrottleRate module
   *      parameter (see e1000_param.c)
   **/
  static unsigned int e1000_update_itr(struct e1000_adapter *adapter,
  				     u16 itr_setting, int packets, int bytes)
  {
  	unsigned int retval = itr_setting;
  	struct e1000_hw *hw = &adapter->hw;
  
  	if (unlikely(hw->mac_type < e1000_82540))
  		goto update_itr_done;
  
  	if (packets == 0)
  		goto update_itr_done;
  
  	switch (itr_setting) {
  	case lowest_latency:
  		/* jumbo frames get bulk treatment*/
  		if (bytes/packets > 8000)
  			retval = bulk_latency;
  		else if ((packets < 5) && (bytes > 512))
  			retval = low_latency;
  		break;
  	case low_latency:  /* 50 usec aka 20000 ints/s */
  		if (bytes > 10000) {
  			/* jumbo frames need bulk latency setting */
  			if (bytes/packets > 8000)
  				retval = bulk_latency;
  			else if ((packets < 10) || ((bytes/packets) > 1200))
  				retval = bulk_latency;
  			else if ((packets > 35))
  				retval = lowest_latency;
  		} else if (bytes/packets > 2000)
  			retval = bulk_latency;
  		else if (packets <= 2 && bytes < 512)
  			retval = lowest_latency;
  		break;
  	case bulk_latency: /* 250 usec aka 4000 ints/s */
  		if (bytes > 25000) {
  			if (packets > 35)
  				retval = low_latency;
  		} else if (bytes < 6000) {
  			retval = low_latency;
  		}
  		break;
  	}
  
  update_itr_done:
  	return retval;
  }
  
  static void e1000_set_itr(struct e1000_adapter *adapter)
  {
  	struct e1000_hw *hw = &adapter->hw;
  	u16 current_itr;
  	u32 new_itr = adapter->itr;
  
  	if (unlikely(hw->mac_type < e1000_82540))
  		return;
  
  	/* for non-gigabit speeds, just fix the interrupt rate at 4000 */
  	if (unlikely(adapter->link_speed != SPEED_1000)) {
  		new_itr = 4000;
  		goto set_itr_now;
  	}
  
  	adapter->tx_itr = e1000_update_itr(adapter, adapter->tx_itr,
  					   adapter->total_tx_packets,
  					   adapter->total_tx_bytes);
  	/* conservative mode (itr 3) eliminates the lowest_latency setting */
  	if (adapter->itr_setting == 3 && adapter->tx_itr == lowest_latency)
  		adapter->tx_itr = low_latency;
  
  	adapter->rx_itr = e1000_update_itr(adapter, adapter->rx_itr,
  					   adapter->total_rx_packets,
  					   adapter->total_rx_bytes);
  	/* conservative mode (itr 3) eliminates the lowest_latency setting */
  	if (adapter->itr_setting == 3 && adapter->rx_itr == lowest_latency)
  		adapter->rx_itr = low_latency;
  
  	current_itr = max(adapter->rx_itr, adapter->tx_itr);
  
  	switch (current_itr) {
  	/* counts and packets in update_itr are dependent on these numbers */
  	case lowest_latency:
  		new_itr = 70000;
  		break;
  	case low_latency:
  		new_itr = 20000; /* aka hwitr = ~200 */
  		break;
  	case bulk_latency:
  		new_itr = 4000;
  		break;
  	default:
  		break;
  	}
  
  set_itr_now:
  	if (new_itr != adapter->itr) {
  		/* this attempts to bias the interrupt rate towards Bulk
  		 * by adding intermediate steps when interrupt rate is
  		 * increasing
  		 */
  		new_itr = new_itr > adapter->itr ?
  			  min(adapter->itr + (new_itr >> 2), new_itr) :
  			  new_itr;
  		adapter->itr = new_itr;
  		ew32(ITR, 1000000000 / (new_itr * 256));
  	}
  }
  
  #define E1000_TX_FLAGS_CSUM		0x00000001
  #define E1000_TX_FLAGS_VLAN		0x00000002
  #define E1000_TX_FLAGS_TSO		0x00000004
  #define E1000_TX_FLAGS_IPV4		0x00000008
  #define E1000_TX_FLAGS_NO_FCS		0x00000010
  #define E1000_TX_FLAGS_VLAN_MASK	0xffff0000
  #define E1000_TX_FLAGS_VLAN_SHIFT	16
  
  static int e1000_tso(struct e1000_adapter *adapter,
  		     struct e1000_tx_ring *tx_ring, struct sk_buff *skb,
  		     __be16 protocol)
  {
  	struct e1000_context_desc *context_desc;
  	struct e1000_tx_buffer *buffer_info;
  	unsigned int i;
  	u32 cmd_length = 0;
  	u16 ipcse = 0, tucse, mss;
  	u8 ipcss, ipcso, tucss, tucso, hdr_len;
  
  	if (skb_is_gso(skb)) {
  		int err;
  
  		err = skb_cow_head(skb, 0);
  		if (err < 0)
  			return err;
  
  		hdr_len = skb_transport_offset(skb) + tcp_hdrlen(skb);
  		mss = skb_shinfo(skb)->gso_size;
  		if (protocol == htons(ETH_P_IP)) {
  			struct iphdr *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);
  			cmd_length = E1000_TXD_CMD_IP;
  			ipcse = skb_transport_offset(skb) - 1;
  		} else if (skb_is_gso_v6(skb)) {
  			tcp_v6_gso_csum_prep(skb);
  			ipcse = 0;
  		}
  		ipcss = skb_network_offset(skb);
  		ipcso = (void *)&(ip_hdr(skb)->check) - (void *)skb->data;
  		tucss = skb_transport_offset(skb);
  		tucso = (void *)&(tcp_hdr(skb)->check) - (void *)skb->data;
  		tucse = 0;
  
  		cmd_length |= (E1000_TXD_CMD_DEXT | E1000_TXD_CMD_TSE |
  			       E1000_TXD_CMD_TCP | (skb->len - (hdr_len)));
  
  		i = tx_ring->next_to_use;
  		context_desc = E1000_CONTEXT_DESC(*tx_ring, i);
  		buffer_info = &tx_ring->buffer_info[i];
  
  		context_desc->lower_setup.ip_fields.ipcss  = ipcss;
  		context_desc->lower_setup.ip_fields.ipcso  = ipcso;
  		context_desc->lower_setup.ip_fields.ipcse  = cpu_to_le16(ipcse);
  		context_desc->upper_setup.tcp_fields.tucss = tucss;
  		context_desc->upper_setup.tcp_fields.tucso = tucso;
  		context_desc->upper_setup.tcp_fields.tucse = cpu_to_le16(tucse);
  		context_desc->tcp_seg_setup.fields.mss     = cpu_to_le16(mss);
  		context_desc->tcp_seg_setup.fields.hdr_len = hdr_len;
  		context_desc->cmd_and_length = cpu_to_le32(cmd_length);
  
  		buffer_info->time_stamp = jiffies;
  		buffer_info->next_to_watch = i;
  
  		if (++i == tx_ring->count)
  			i = 0;
  
  		tx_ring->next_to_use = i;
  
  		return true;
  	}
  	return false;
  }
  
  static bool e1000_tx_csum(struct e1000_adapter *adapter,
  			  struct e1000_tx_ring *tx_ring, struct sk_buff *skb,
  			  __be16 protocol)
  {
  	struct e1000_context_desc *context_desc;
  	struct e1000_tx_buffer *buffer_info;
  	unsigned int i;
  	u8 css;
  	u32 cmd_len = E1000_TXD_CMD_DEXT;
  
  	if (skb->ip_summed != CHECKSUM_PARTIAL)
  		return false;
  
  	switch (protocol) {
  	case cpu_to_be16(ETH_P_IP):
  		if (ip_hdr(skb)->protocol == IPPROTO_TCP)
  			cmd_len |= E1000_TXD_CMD_TCP;
  		break;
  	case cpu_to_be16(ETH_P_IPV6):
  		/* XXX not handling all IPV6 headers */
  		if (ipv6_hdr(skb)->nexthdr == IPPROTO_TCP)
  			cmd_len |= E1000_TXD_CMD_TCP;
  		break;
  	default:
  		if (unlikely(net_ratelimit()))
  			e_warn(drv, "checksum_partial proto=%x!\n",
  			       skb->protocol);
  		break;
  	}
  
  	css = skb_checksum_start_offset(skb);
  
  	i = tx_ring->next_to_use;
  	buffer_info = &tx_ring->buffer_info[i];
  	context_desc = E1000_CONTEXT_DESC(*tx_ring, i);
  
  	context_desc->lower_setup.ip_config = 0;
  	context_desc->upper_setup.tcp_fields.tucss = css;
  	context_desc->upper_setup.tcp_fields.tucso =
  		css + skb->csum_offset;
  	context_desc->upper_setup.tcp_fields.tucse = 0;
  	context_desc->tcp_seg_setup.data = 0;
  	context_desc->cmd_and_length = cpu_to_le32(cmd_len);
  
  	buffer_info->time_stamp = jiffies;
  	buffer_info->next_to_watch = i;
  
  	if (unlikely(++i == tx_ring->count))
  		i = 0;
  
  	tx_ring->next_to_use = i;
  
  	return true;
  }
  
  #define E1000_MAX_TXD_PWR	12
  #define E1000_MAX_DATA_PER_TXD	(1<<E1000_MAX_TXD_PWR)
  
  static int e1000_tx_map(struct e1000_adapter *adapter,
  			struct e1000_tx_ring *tx_ring,
  			struct sk_buff *skb, unsigned int first,
  			unsigned int max_per_txd, unsigned int nr_frags,
  			unsigned int mss)
  {
  	struct e1000_hw *hw = &adapter->hw;
  	struct pci_dev *pdev = adapter->pdev;
  	struct e1000_tx_buffer *buffer_info;
  	unsigned int len = skb_headlen(skb);
  	unsigned int offset = 0, size, count = 0, i;
  	unsigned int f, bytecount, segs;
  
  	i = tx_ring->next_to_use;
  
  	while (len) {
  		buffer_info = &tx_ring->buffer_info[i];
  		size = min(len, max_per_txd);
  		/* Workaround for Controller erratum --
  		 * descriptor for non-tso packet in a linear SKB that follows a
  		 * tso gets written back prematurely before the data is fully
  		 * DMA'd to the controller
  		 */
  		if (!skb->data_len && tx_ring->last_tx_tso &&
  		    !skb_is_gso(skb)) {
  			tx_ring->last_tx_tso = false;
  			size -= 4;
  		}
  
  		/* 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;
  		/* work-around for errata 10 and it applies
  		 * to all controllers in PCI-X mode
  		 * The fix is to make sure that the first descriptor of a
  		 * packet is smaller than 2048 - 16 - 16 (or 2016) bytes
  		 */
  		if (unlikely((hw->bus_type == e1000_bus_type_pcix) &&
  			     (size > 2015) && count == 0))
  			size = 2015;
  
  		/* Workaround for potential 82544 hang in PCI-X.  Avoid
  		 * terminating buffers within evenly-aligned dwords.
  		 */
  		if (unlikely(adapter->pcix_82544 &&
  		   !((unsigned long)(skb->data + offset + size - 1) & 4) &&
  		   size > 4))
  			size -= 4;
  
  		buffer_info->length = size;
  		/* set time_stamp *before* dma to help avoid a possible race */
  		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 = i;
  
  		len -= size;
  		offset += size;
  		count++;
  		if (len) {
  			i++;
  			if (unlikely(i == tx_ring->count))
  				i = 0;
  		}
  	}
  
  	for (f = 0; f < nr_frags; f++) {
  		const skb_frag_t *frag = &skb_shinfo(skb)->frags[f];
  
  		len = skb_frag_size(frag);
  		offset = 0;
  
  		while (len) {
  			unsigned long bufend;
  			i++;
  			if (unlikely(i == tx_ring->count))
  				i = 0;
  
  			buffer_info = &tx_ring->buffer_info[i];
  			size = min(len, max_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;
  			/* Workaround for potential 82544 hang in PCI-X.
  			 * Avoid terminating buffers within evenly-aligned
  			 * dwords.
  			 */
  			bufend = (unsigned long)
  				page_to_phys(skb_frag_page(frag));
  			bufend += offset + size - 1;
  			if (unlikely(adapter->pcix_82544 &&
  				     !(bufend & 4) &&
  				     size > 4))
  				size -= 4;
  
  			buffer_info->length = size;
  			buffer_info->time_stamp = jiffies;
  			buffer_info->mapped_as_page = true;
  			buffer_info->dma = skb_frag_dma_map(&pdev->dev, frag,
  						offset, size, DMA_TO_DEVICE);
  			if (dma_mapping_error(&pdev->dev, buffer_info->dma))
  				goto dma_error;
  			buffer_info->next_to_watch = i;
  
  			len -= size;
  			offset += size;
  			count++;
  		}
  	}
  
  	segs = skb_shinfo(skb)->gso_segs ?: 1;
  	/* multiply data chunks by size of headers */
  	bytecount = ((segs - 1) * skb_headlen(skb)) + skb->len;
  
  	tx_ring->buffer_info[i].skb = skb;
  	tx_ring->buffer_info[i].segs = segs;
  	tx_ring->buffer_info[i].bytecount = bytecount;
  	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];
  		e1000_unmap_and_free_tx_resource(adapter, buffer_info);
  	}
  
  	return 0;
  }
  
  static void e1000_tx_queue(struct e1000_adapter *adapter,
  			   struct e1000_tx_ring *tx_ring, int tx_flags,
  			   int count)
  {
  	struct e1000_tx_desc *tx_desc = NULL;
  	struct e1000_tx_buffer *buffer_info;
  	u32 txd_upper = 0, txd_lower = E1000_TXD_CMD_IFCS;
  	unsigned int i;
  
  	if (likely(tx_flags & E1000_TX_FLAGS_TSO)) {
  		txd_lower |= E1000_TXD_CMD_DEXT | E1000_TXD_DTYP_D |
  			     E1000_TXD_CMD_TSE;
  		txd_upper |= E1000_TXD_POPTS_TXSM << 8;
  
  		if (likely(tx_flags & E1000_TX_FLAGS_IPV4))
  			txd_upper |= E1000_TXD_POPTS_IXSM << 8;
  	}
  
  	if (likely(tx_flags & E1000_TX_FLAGS_CSUM)) {
  		txd_lower |= E1000_TXD_CMD_DEXT | E1000_TXD_DTYP_D;
  		txd_upper |= E1000_TXD_POPTS_TXSM << 8;
  	}
  
  	if (unlikely(tx_flags & E1000_TX_FLAGS_VLAN)) {
  		txd_lower |= E1000_TXD_CMD_VLE;
  		txd_upper |= (tx_flags & E1000_TX_FLAGS_VLAN_MASK);
  	}
  
  	if (unlikely(tx_flags & E1000_TX_FLAGS_NO_FCS))
  		txd_lower &= ~(E1000_TXD_CMD_IFCS);
  
  	i = tx_ring->next_to_use;
  
  	while (count--) {
  		buffer_info = &tx_ring->buffer_info[i];
  		tx_desc = E1000_TX_DESC(*tx_ring, i);
  		tx_desc->buffer_addr = cpu_to_le64(buffer_info->dma);
  		tx_desc->lower.data =
  			cpu_to_le32(txd_lower | buffer_info->length);
  		tx_desc->upper.data = cpu_to_le32(txd_upper);
  		if (unlikely(++i == tx_ring->count))
  			i = 0;
  	}
  
  	tx_desc->lower.data |= cpu_to_le32(adapter->txd_cmd);
  
  	/* txd_cmd re-enables FCS, so we'll re-disable it here as desired. */
  	if (unlikely(tx_flags & E1000_TX_FLAGS_NO_FCS))
  		tx_desc->lower.data &= ~(cpu_to_le32(E1000_TXD_CMD_IFCS));
  
  	/* 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).
  	 */
  	dma_wmb();
  
  	tx_ring->next_to_use = i;
  }
  
  /* 82547 workaround to avoid controller hang in half-duplex environment.
   * The workaround is to avoid queuing a large packet that would span
   * the internal Tx FIFO ring boundary by notifying the stack to resend
   * the packet at a later time.  This gives the Tx FIFO an opportunity to
   * flush all packets.  When that occurs, we reset the Tx FIFO pointers
   * to the beginning of the Tx FIFO.
   */
  
  #define E1000_FIFO_HDR			0x10
  #define E1000_82547_PAD_LEN		0x3E0
  
  static int e1000_82547_fifo_workaround(struct e1000_adapter *adapter,
  				       struct sk_buff *skb)
  {
  	u32 fifo_space = adapter->tx_fifo_size - adapter->tx_fifo_head;
  	u32 skb_fifo_len = skb->len + E1000_FIFO_HDR;
  
  	skb_fifo_len = ALIGN(skb_fifo_len, E1000_FIFO_HDR);
  
  	if (adapter->link_duplex != HALF_DUPLEX)
  		goto no_fifo_stall_required;
  
  	if (atomic_read(&adapter->tx_fifo_stall))
  		return 1;
  
  	if (skb_fifo_len >= (E1000_82547_PAD_LEN + fifo_space)) {
  		atomic_set(&adapter->tx_fifo_stall, 1);
  		return 1;
  	}
  
  no_fifo_stall_required:
  	adapter->tx_fifo_head += skb_fifo_len;
  	if (adapter->tx_fifo_head >= adapter->tx_fifo_size)
  		adapter->tx_fifo_head -= adapter->tx_fifo_size;
  	return 0;
  }
  
  static int __e1000_maybe_stop_tx(struct net_device *netdev, int size)
  {
  	struct e1000_adapter *adapter = netdev_priv(netdev);
  	struct e1000_tx_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(E1000_DESC_UNUSED(tx_ring) < size))
  		return -EBUSY;
  
  	/* A reprieve! */
  	netif_start_queue(netdev);
  	++adapter->restart_queue;
  	return 0;
  }
  
  static int e1000_maybe_stop_tx(struct net_device *netdev,
  			       struct e1000_tx_ring *tx_ring, int size)
  {
  	if (likely(E1000_DESC_UNUSED(tx_ring) >= size))
  		return 0;
  	return __e1000_maybe_stop_tx(netdev, size);
  }
  
  #define TXD_USE_COUNT(S, X) (((S) + ((1 << (X)) - 1)) >> (X))
  static netdev_tx_t e1000_xmit_frame(struct sk_buff *skb,
  				    struct net_device *netdev)
  {
  	struct e1000_adapter *adapter = netdev_priv(netdev);
  	struct e1000_hw *hw = &adapter->hw;
  	struct e1000_tx_ring *tx_ring;
  	unsigned int first, max_per_txd = E1000_MAX_DATA_PER_TXD;
  	unsigned int max_txd_pwr = E1000_MAX_TXD_PWR;
  	unsigned int tx_flags = 0;
  	unsigned int len = skb_headlen(skb);
  	unsigned int nr_frags;
  	unsigned int mss;
  	int count = 0;
  	int tso;
  	unsigned int f;
  	__be16 protocol = vlan_get_protocol(skb);
  
  	/* This goes back to the question of how to logically map a Tx queue
  	 * to a flow.  Right now, performance is impacted slightly negatively
  	 * if using multiple Tx queues.  If the stack breaks away from a
  	 * single qdisc implementation, we can look at this again.
  	 */
  	tx_ring = adapter->tx_ring;
  
  	/* On PCI/PCI-X HW, if packet size is less than ETH_ZLEN,
  	 * packets may get corrupted during padding by HW.
  	 * To WA this issue, pad all small packets manually.
  	 */
  	if (eth_skb_pad(skb))
  		return NETDEV_TX_OK;
  
  	mss = skb_shinfo(skb)->gso_size;
  	/* The controller does a simple calculation to
  	 * make sure there is enough room in the FIFO before
  	 * initiating the DMA for each buffer.  The calc is:
  	 * 4 = ceil(buffer len/mss).  To make sure we don't
  	 * overrun the FIFO, adjust the max buffer len if mss
  	 * drops.
  	 */
  	if (mss) {
  		u8 hdr_len;
  		max_per_txd = min(mss << 2, max_per_txd);
  		max_txd_pwr = fls(max_per_txd) - 1;
  
  		hdr_len = skb_transport_offset(skb) + tcp_hdrlen(skb);
  		if (skb->data_len && hdr_len == len) {
  			switch (hw->mac_type) {
  			case e1000_82544: {
  				unsigned int pull_size;
  
  				/* Make sure we have room to chop off 4 bytes,
  				 * and that the end alignment will work out to
  				 * this hardware's requirements
  				 * NOTE: this is a TSO only workaround
  				 * if end byte alignment not correct move us
  				 * into the next dword
  				 */
  				if ((unsigned long)(skb_tail_pointer(skb) - 1)
  				    & 4)
  					break;
  				pull_size = min((unsigned int)4, skb->data_len);
  				if (!__pskb_pull_tail(skb, pull_size)) {
  					e_err(drv, "__pskb_pull_tail "
  					      "failed.\n");
  					dev_kfree_skb_any(skb);
  					return NETDEV_TX_OK;
  				}
  				len = skb_headlen(skb);
  				break;
  			}
  			default:
  				/* do nothing */
  				break;
  			}
  		}
  	}
  
  	/* reserve a descriptor for the offload context */
  	if ((mss) || (skb->ip_summed == CHECKSUM_PARTIAL))
  		count++;
  	count++;
  
  	/* Controller Erratum workaround */
  	if (!skb->data_len && tx_ring->last_tx_tso && !skb_is_gso(skb))
  		count++;
  
  	count += TXD_USE_COUNT(len, max_txd_pwr);
  
  	if (adapter->pcix_82544)
  		count++;
  
  	/* work-around for errata 10 and it applies to all controllers
  	 * in PCI-X mode, so add one more descriptor to the count
  	 */
  	if (unlikely((hw->bus_type == e1000_bus_type_pcix) &&
  			(len > 2015)))
  		count++;
  
  	nr_frags = skb_shinfo(skb)->nr_frags;
  	for (f = 0; f < nr_frags; f++)
  		count += TXD_USE_COUNT(skb_frag_size(&skb_shinfo(skb)->frags[f]),
  				       max_txd_pwr);
  	if (adapter->pcix_82544)
  		count += nr_frags;
  
  	/* need: count + 2 desc gap to keep tail from touching
  	 * head, otherwise try next time
  	 */
  	if (unlikely(e1000_maybe_stop_tx(netdev, tx_ring, count + 2)))
  		return NETDEV_TX_BUSY;
  
  	if (unlikely((hw->mac_type == e1000_82547) &&
  		     (e1000_82547_fifo_workaround(adapter, skb)))) {
  		netif_stop_queue(netdev);
  		if (!test_bit(__E1000_DOWN, &adapter->flags))
  			schedule_delayed_work(&adapter->fifo_stall_task, 1);
  		return NETDEV_TX_BUSY;
  	}
  
  	if (skb_vlan_tag_present(skb)) {
  		tx_flags |= E1000_TX_FLAGS_VLAN;
  		tx_flags |= (skb_vlan_tag_get(skb) <<
  			     E1000_TX_FLAGS_VLAN_SHIFT);
  	}
  
  	first = tx_ring->next_to_use;
  
  	tso = e1000_tso(adapter, tx_ring, skb, protocol);
  	if (tso < 0) {
  		dev_kfree_skb_any(skb);
  		return NETDEV_TX_OK;
  	}
  
  	if (likely(tso)) {
  		if (likely(hw->mac_type != e1000_82544))
  			tx_ring->last_tx_tso = true;
  		tx_flags |= E1000_TX_FLAGS_TSO;
  	} else if (likely(e1000_tx_csum(adapter, tx_ring, skb, protocol)))
  		tx_flags |= E1000_TX_FLAGS_CSUM;
  
  	if (protocol == htons(ETH_P_IP))
  		tx_flags |= E1000_TX_FLAGS_IPV4;
  
  	if (unlikely(skb->no_fcs))
  		tx_flags |= E1000_TX_FLAGS_NO_FCS;
  
  	count = e1000_tx_map(adapter, tx_ring, skb, first, max_per_txd,
  			     nr_frags, mss);
  
  	if (count) {
  		/* The descriptors needed is higher than other Intel drivers
  		 * due to a number of workarounds.  The breakdown is below:
  		 * Data descriptors: MAX_SKB_FRAGS + 1
  		 * Context Descriptor: 1
  		 * Keep head from touching tail: 2
  		 * Workarounds: 3
  		 */
  		int desc_needed = MAX_SKB_FRAGS + 7;
  
  		netdev_sent_queue(netdev, skb->len);
  		skb_tx_timestamp(skb);
  
  		e1000_tx_queue(adapter, tx_ring, tx_flags, count);
  
  		/* 82544 potentially requires twice as many data descriptors
  		 * in order to guarantee buffers don't end on evenly-aligned
  		 * dwords
  		 */
  		if (adapter->pcix_82544)
  			desc_needed += MAX_SKB_FRAGS + 1;
  
  		/* Make sure there is space in the ring for the next send. */
  		e1000_maybe_stop_tx(netdev, tx_ring, desc_needed);
  
  		if (!netdev_xmit_more() ||
  		    netif_xmit_stopped(netdev_get_tx_queue(netdev, 0))) {
  			writel(tx_ring->next_to_use, hw->hw_addr + tx_ring->tdt);
  		}
  	} else {
  		dev_kfree_skb_any(skb);
  		tx_ring->buffer_info[first].time_stamp = 0;
  		tx_ring->next_to_use = first;
  	}
  
  	return NETDEV_TX_OK;
  }
  
  #define NUM_REGS 38 /* 1 based count */
  static void e1000_regdump(struct e1000_adapter *adapter)
  {
  	struct e1000_hw *hw = &adapter->hw;
  	u32 regs[NUM_REGS];
  	u32 *regs_buff = regs;
  	int i = 0;
  
  	static const char * const reg_name[] = {
  		"CTRL",  "STATUS",
  		"RCTL", "RDLEN", "RDH", "RDT", "RDTR",
  		"TCTL", "TDBAL", "TDBAH", "TDLEN", "TDH", "TDT",
  		"TIDV", "TXDCTL", "TADV", "TARC0",
  		"TDBAL1", "TDBAH1", "TDLEN1", "TDH1", "TDT1",
  		"TXDCTL1", "TARC1",
  		"CTRL_EXT", "ERT", "RDBAL", "RDBAH",
  		"TDFH", "TDFT", "TDFHS", "TDFTS", "TDFPC",
  		"RDFH", "RDFT", "RDFHS", "RDFTS", "RDFPC"
  	};
  
  	regs_buff[0]  = er32(CTRL);
  	regs_buff[1]  = er32(STATUS);
  
  	regs_buff[2]  = er32(RCTL);
  	regs_buff[3]  = er32(RDLEN);
  	regs_buff[4]  = er32(RDH);
  	regs_buff[5]  = er32(RDT);
  	regs_buff[6]  = er32(RDTR);
  
  	regs_buff[7]  = er32(TCTL);
  	regs_buff[8]  = er32(TDBAL);
  	regs_buff[9]  = er32(TDBAH);
  	regs_buff[10] = er32(TDLEN);
  	regs_buff[11] = er32(TDH);
  	regs_buff[12] = er32(TDT);
  	regs_buff[13] = er32(TIDV);
  	regs_buff[14] = er32(TXDCTL);
  	regs_buff[15] = er32(TADV);
  	regs_buff[16] = er32(TARC0);
  
  	regs_buff[17] = er32(TDBAL1);
  	regs_buff[18] = er32(TDBAH1);
  	regs_buff[19] = er32(TDLEN1);
  	regs_buff[20] = er32(TDH1);
  	regs_buff[21] = er32(TDT1);
  	regs_buff[22] = er32(TXDCTL1);
  	regs_buff[23] = er32(TARC1);
  	regs_buff[24] = er32(CTRL_EXT);
  	regs_buff[25] = er32(ERT);
  	regs_buff[26] = er32(RDBAL0);
  	regs_buff[27] = er32(RDBAH0);
  	regs_buff[28] = er32(TDFH);
  	regs_buff[29] = er32(TDFT);
  	regs_buff[30] = er32(TDFHS);
  	regs_buff[31] = er32(TDFTS);
  	regs_buff[32] = er32(TDFPC);
  	regs_buff[33] = er32(RDFH);
  	regs_buff[34] = er32(RDFT);
  	regs_buff[35] = er32(RDFHS);
  	regs_buff[36] = er32(RDFTS);
  	regs_buff[37] = er32(RDFPC);
  
  	pr_info("Register dump\n");
  	for (i = 0; i < NUM_REGS; i++)
  		pr_info("%-15s  %08x\n", reg_name[i], regs_buff[i]);
  }
  
  /*
   * e1000_dump: Print registers, tx ring and rx ring
   */
  static void e1000_dump(struct e1000_adapter *adapter)
  {
  	/* this code doesn't handle multiple rings */
  	struct e1000_tx_ring *tx_ring = adapter->tx_ring;
  	struct e1000_rx_ring *rx_ring = adapter->rx_ring;
  	int i;
  
  	if (!netif_msg_hw(adapter))
  		return;
  
  	/* Print Registers */
  	e1000_regdump(adapter);
  
  	/* transmit dump */
  	pr_info("TX Desc ring0 dump\n");
  
  	/* Transmit Descriptor Formats - DEXT[29] is 0 (Legacy) or 1 (Extended)
  	 *
  	 * Legacy Transmit Descriptor
  	 *   +--------------------------------------------------------------+
  	 * 0 |         Buffer Address [63:0] (Reserved on Write Back)       |
  	 *   +--------------------------------------------------------------+
  	 * 8 | Special  |    CSS     | Status |  CMD    |  CSO   |  Length  |
  	 *   +--------------------------------------------------------------+
  	 *   63       48 47        36 35    32 31     24 23    16 15        0
  	 *
  	 * Extended Context Descriptor (DTYP=0x0) for TSO or checksum offload
  	 *   63      48 47    40 39       32 31             16 15    8 7      0
  	 *   +----------------------------------------------------------------+
  	 * 0 |  TUCSE  | TUCS0  |   TUCSS   |     IPCSE       | IPCS0 | IPCSS |
  	 *   +----------------------------------------------------------------+
  	 * 8 |   MSS   | HDRLEN | RSV | STA | TUCMD | DTYP |      PAYLEN      |
  	 *   +----------------------------------------------------------------+
  	 *   63      48 47    40 39 36 35 32 31   24 23  20 19                0
  	 *
  	 * Extended Data Descriptor (DTYP=0x1)
  	 *   +----------------------------------------------------------------+
  	 * 0 |                     Buffer Address [63:0]                      |
  	 *   +----------------------------------------------------------------+
  	 * 8 | VLAN tag |  POPTS  | Rsvd | Status | Command | DTYP |  DTALEN  |
  	 *   +----------------------------------------------------------------+
  	 *   63       48 47     40 39  36 35    32 31     24 23  20 19        0
  	 */
  	pr_info("Tc[desc]     [Ce CoCsIpceCoS] [MssHlRSCm0Plen] [bi->dma       ] leng  ntw timestmp         bi->skb\n");
  	pr_info("Td[desc]     [address 63:0  ] [VlaPoRSCm1Dlen] [bi->dma       ] leng  ntw timestmp         bi->skb\n");
  
  	if (!netif_msg_tx_done(adapter))
  		goto rx_ring_summary;
  
  	for (i = 0; tx_ring->desc && (i < tx_ring->count); i++) {
  		struct e1000_tx_desc *tx_desc = E1000_TX_DESC(*tx_ring, i);
  		struct e1000_tx_buffer *buffer_info = &tx_ring->buffer_info[i];
  		struct my_u { __le64 a; __le64 b; };
  		struct my_u *u = (struct my_u *)tx_desc;
  		const char *type;
  
  		if (i == tx_ring->next_to_use && i == tx_ring->next_to_clean)
  			type = "NTC/U";
  		else if (i == tx_ring->next_to_use)
  			type = "NTU";
  		else if (i == tx_ring->next_to_clean)
  			type = "NTC";
  		else
  			type = "";
  
  		pr_info("T%c[0x%03X]    %016llX %016llX %016llX %04X  %3X %016llX %p %s\n",
  			((le64_to_cpu(u->b) & (1<<20)) ? 'd' : 'c'), i,
  			le64_to_cpu(u->a), le64_to_cpu(u->b),
  			(u64)buffer_info->dma, buffer_info->length,
  			buffer_info->next_to_watch,
  			(u64)buffer_info->time_stamp, buffer_info->skb, type);
  	}
  
  rx_ring_summary:
  	/* receive dump */
  	pr_info("\nRX Desc ring dump\n");
  
  	/* Legacy Receive Descriptor Format
  	 *
  	 * +-----------------------------------------------------+
  	 * |                Buffer Address [63:0]                |
  	 * +-----------------------------------------------------+
  	 * | VLAN Tag | Errors | Status 0 | Packet csum | Length |
  	 * +-----------------------------------------------------+
  	 * 63       48 47    40 39      32 31         16 15      0
  	 */
  	pr_info("R[desc]      [address 63:0  ] [vl er S cks ln] [bi->dma       ] [bi->skb]\n");
  
  	if (!netif_msg_rx_status(adapter))
  		goto exit;
  
  	for (i = 0; rx_ring->desc && (i < rx_ring->count); i++) {
  		struct e1000_rx_desc *rx_desc = E1000_RX_DESC(*rx_ring, i);
  		struct e1000_rx_buffer *buffer_info = &rx_ring->buffer_info[i];
  		struct my_u { __le64 a; __le64 b; };
  		struct my_u *u = (struct my_u *)rx_desc;
  		const char *type;
  
  		if (i == rx_ring->next_to_use)
  			type = "NTU";
  		else if (i == rx_ring->next_to_clean)
  			type = "NTC";
  		else
  			type = "";
  
  		pr_info("R[0x%03X]     %016llX %016llX %016llX %p %s\n",
  			i, le64_to_cpu(u->a), le64_to_cpu(u->b),
  			(u64)buffer_info->dma, buffer_info->rxbuf.data, type);
  	} /* for */
  
  	/* dump the descriptor caches */
  	/* rx */
  	pr_info("Rx descriptor cache in 64bit format\n");
  	for (i = 0x6000; i <= 0x63FF ; i += 0x10) {
  		pr_info("R%04X: %08X|%08X %08X|%08X\n",
  			i,
  			readl(adapter->hw.hw_addr + i+4),
  			readl(adapter->hw.hw_addr + i),
  			readl(adapter->hw.hw_addr + i+12),
  			readl(adapter->hw.hw_addr + i+8));
  	}
  	/* tx */
  	pr_info("Tx descriptor cache in 64bit format\n");
  	for (i = 0x7000; i <= 0x73FF ; i += 0x10) {
  		pr_info("T%04X: %08X|%08X %08X|%08X\n",
  			i,
  			readl(adapter->hw.hw_addr + i+4),
  			readl(adapter->hw.hw_addr + i),
  			readl(adapter->hw.hw_addr + i+12),
  			readl(adapter->hw.hw_addr + i+8));
  	}
  exit:
  	return;
  }
  
  /**
   * e1000_tx_timeout - Respond to a Tx Hang
   * @netdev: network interface device structure
   * @txqueue: number of the Tx queue that hung (unused)
   **/
  static void e1000_tx_timeout(struct net_device *netdev, unsigned int __always_unused txqueue)
  {
  	struct e1000_adapter *adapter = netdev_priv(netdev);
  
  	/* Do the reset outside of interrupt context */
  	adapter->tx_timeout_count++;
  	schedule_work(&adapter->reset_task);
  }
  
  static void e1000_reset_task(struct work_struct *work)
  {
  	struct e1000_adapter *adapter =
  		container_of(work, struct e1000_adapter, reset_task);
  
  	e_err(drv, "Reset adapter\n");
  	e1000_reinit_locked(adapter);
  }
  
  /**
   * e1000_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 e1000_change_mtu(struct net_device *netdev, int new_mtu)
  {
  	struct e1000_adapter *adapter = netdev_priv(netdev);
  	struct e1000_hw *hw = &adapter->hw;
  	int max_frame = new_mtu + ETH_HLEN + ETH_FCS_LEN;
  
  	/* Adapter-specific max frame size limits. */
  	switch (hw->mac_type) {
  	case e1000_undefined ... e1000_82542_rev2_1:
  		if (max_frame > (ETH_FRAME_LEN + ETH_FCS_LEN)) {
  			e_err(probe, "Jumbo Frames not supported.\n");
  			return -EINVAL;
  		}
  		break;
  	default:
  		/* Capable of supporting up to MAX_JUMBO_FRAME_SIZE limit. */
  		break;
  	}
  
  	while (test_and_set_bit(__E1000_RESETTING, &adapter->flags))
  		msleep(1);
  	/* e1000_down has a dependency on max_frame_size */
  	hw->max_frame_size = max_frame;
  	if (netif_running(netdev)) {
  		/* prevent buffers from being reallocated */
  		adapter->alloc_rx_buf = e1000_alloc_dummy_rx_buffers;
  		e1000_down(adapter);
  	}
  
  	/* NOTE: netdev_alloc_skb reserves 16 bytes, and typically NET_IP_ALIGN
  	 * means we reserve 2 more, this pushes us to allocate from the next
  	 * larger slab size.
  	 * i.e. RXBUFFER_2048 --> size-4096 slab
  	 * however with the new *_jumbo_rx* routines, jumbo receives will use
  	 * fragmented skbs
  	 */
  
  	if (max_frame <= E1000_RXBUFFER_2048)
  		adapter->rx_buffer_len = E1000_RXBUFFER_2048;
  	else
  #if (PAGE_SIZE >= E1000_RXBUFFER_16384)
  		adapter->rx_buffer_len = E1000_RXBUFFER_16384;
  #elif (PAGE_SIZE >= E1000_RXBUFFER_4096)
  		adapter->rx_buffer_len = PAGE_SIZE;
  #endif
  
  	/* adjust allocation if LPE protects us, and we aren't using SBP */
  	if (!hw->tbi_compatibility_on &&
  	    ((max_frame == (ETH_FRAME_LEN + ETH_FCS_LEN)) ||
  	     (max_frame == MAXIMUM_ETHERNET_VLAN_SIZE)))
  		adapter->rx_buffer_len = MAXIMUM_ETHERNET_VLAN_SIZE;
  
  	netdev_dbg(netdev, "changing MTU from %d to %d\n",
  		   netdev->mtu, new_mtu);
  	netdev->mtu = new_mtu;
  
  	if (netif_running(netdev))
  		e1000_up(adapter);
  	else
  		e1000_reset(adapter);
  
  	clear_bit(__E1000_RESETTING, &adapter->flags);
  
  	return 0;
  }
  
  /**
   * e1000_update_stats - Update the board statistics counters
   * @adapter: board private structure
   **/
  void e1000_update_stats(struct e1000_adapter *adapter)
  {
  	struct net_device *netdev = adapter->netdev;
  	struct e1000_hw *hw = &adapter->hw;
  	struct pci_dev *pdev = adapter->pdev;
  	unsigned long flags;
  	u16 phy_tmp;
  
  #define PHY_IDLE_ERROR_COUNT_MASK 0x00FF
  
  	/* Prevent stats update while adapter is being reset, or if the pci
  	 * connection is down.
  	 */
  	if (adapter->link_speed == 0)
  		return;
  	if (pci_channel_offline(pdev))
  		return;
  
  	spin_lock_irqsave(&adapter->stats_lock, flags);
  
  	/* these counters are modified from e1000_tbi_adjust_stats,
  	 * called from the interrupt context, so they must only
  	 * be written while holding adapter->stats_lock
  	 */
  
  	adapter->stats.crcerrs += er32(CRCERRS);
  	adapter->stats.gprc += er32(GPRC);
  	adapter->stats.gorcl += er32(GORCL);
  	adapter->stats.gorch += er32(GORCH);
  	adapter->stats.bprc += er32(BPRC);
  	adapter->stats.mprc += er32(MPRC);
  	adapter->stats.roc += er32(ROC);
  
  	adapter->stats.prc64 += er32(PRC64);
  	adapter->stats.prc127 += er32(PRC127);
  	adapter->stats.prc255 += er32(PRC255);
  	adapter->stats.prc511 += er32(PRC511);
  	adapter->stats.prc1023 += er32(PRC1023);
  	adapter->stats.prc1522 += er32(PRC1522);
  
  	adapter->stats.symerrs += er32(SYMERRS);
  	adapter->stats.mpc += er32(MPC);
  	adapter->stats.scc += er32(SCC);
  	adapter->stats.ecol += er32(ECOL);
  	adapter->stats.mcc += er32(MCC);
  	adapter->stats.latecol += er32(LATECOL);
  	adapter->stats.dc += er32(DC);
  	adapter->stats.sec += er32(SEC);
  	adapter->stats.rlec += er32(RLEC);
  	adapter->stats.xonrxc += er32(XONRXC);
  	adapter->stats.xontxc += er32(XONTXC);
  	adapter->stats.xoffrxc += er32(XOFFRXC);
  	adapter->stats.xofftxc += er32(XOFFTXC);
  	adapter->stats.fcruc += er32(FCRUC);
  	adapter->stats.gptc += er32(GPTC);
  	adapter->stats.gotcl += er32(GOTCL);
  	adapter->stats.gotch += er32(GOTCH);
  	adapter->stats.rnbc += er32(RNBC);
  	adapter->stats.ruc += er32(RUC);
  	adapter->stats.rfc += er32(RFC);
  	adapter->stats.rjc += er32(RJC);
  	adapter->stats.torl += er32(TORL);
  	adapter->stats.torh += er32(TORH);
  	adapter->stats.totl += er32(TOTL);
  	adapter->stats.toth += er32(TOTH);
  	adapter->stats.tpr += er32(TPR);
  
  	adapter->stats.ptc64 += er32(PTC64);
  	adapter->stats.ptc127 += er32(PTC127);
  	adapter->stats.ptc255 += er32(PTC255);
  	adapter->stats.ptc511 += er32(PTC511);
  	adapter->stats.ptc1023 += er32(PTC1023);
  	adapter->stats.ptc1522 += er32(PTC1522);
  
  	adapter->stats.mptc += er32(MPTC);
  	adapter->stats.bptc += er32(BPTC);
  
  	/* used for adaptive IFS */
  
  	hw->tx_packet_delta = er32(TPT);
  	adapter->stats.tpt += hw->tx_packet_delta;
  	hw->collision_delta = er32(COLC);
  	adapter->stats.colc += hw->collision_delta;
  
  	if (hw->mac_type >= e1000_82543) {
  		adapter->stats.algnerrc += er32(ALGNERRC);
  		adapter->stats.rxerrc += er32(RXERRC);
  		adapter->stats.tncrs += er32(TNCRS);
  		adapter->stats.cexterr += er32(CEXTERR);
  		adapter->stats.tsctc += er32(TSCTC);
  		adapter->stats.tsctfc += er32(TSCTFC);
  	}
  
  	/* Fill out the OS statistics structure */
  	netdev->stats.multicast = adapter->stats.mprc;
  	netdev->stats.collisions = adapter->stats.colc;
  
  	/* Rx Errors */
  
  	/* RLEC on some newer hardware can be incorrect so build
  	 * our own version based on RUC and ROC
  	 */
  	netdev->stats.rx_errors = adapter->stats.rxerrc +
  		adapter->stats.crcerrs + adapter->stats.algnerrc +
  		adapter->stats.ruc + adapter->stats.roc +
  		adapter->stats.cexterr;
  	adapter->stats.rlerrc = adapter->stats.ruc + adapter->stats.roc;
  	netdev->stats.rx_length_errors = adapter->stats.rlerrc;
  	netdev->stats.rx_crc_errors = adapter->stats.crcerrs;
  	netdev->stats.rx_frame_errors = adapter->stats.algnerrc;
  	netdev->stats.rx_missed_errors = adapter->stats.mpc;
  
  	/* Tx Errors */
  	adapter->stats.txerrc = adapter->stats.ecol + adapter->stats.latecol;
  	netdev->stats.tx_errors = adapter->stats.txerrc;
  	netdev->stats.tx_aborted_errors = adapter->stats.ecol;
  	netdev->stats.tx_window_errors = adapter->stats.latecol;
  	netdev->stats.tx_carrier_errors = adapter->stats.tncrs;
  	if (hw->bad_tx_carr_stats_fd &&
  	    adapter->link_duplex == FULL_DUPLEX) {
  		netdev->stats.tx_carrier_errors = 0;
  		adapter->stats.tncrs = 0;
  	}
  
  	/* Tx Dropped needs to be maintained elsewhere */
  
  	/* Phy Stats */
  	if (hw->media_type == e1000_media_type_copper) {
  		if ((adapter->link_speed == SPEED_1000) &&
  		   (!e1000_read_phy_reg(hw, PHY_1000T_STATUS, &phy_tmp))) {
  			phy_tmp &= PHY_IDLE_ERROR_COUNT_MASK;
  			adapter->phy_stats.idle_errors += phy_tmp;
  		}
  
  		if ((hw->mac_type <= e1000_82546) &&
  		   (hw->phy_type == e1000_phy_m88) &&
  		   !e1000_read_phy_reg(hw, M88E1000_RX_ERR_CNTR, &phy_tmp))
  			adapter->phy_stats.receive_errors += phy_tmp;
  	}
  
  	/* Management Stats */
  	if (hw->has_smbus) {
  		adapter->stats.mgptc += er32(MGTPTC);
  		adapter->stats.mgprc += er32(MGTPRC);
  		adapter->stats.mgpdc += er32(MGTPDC);
  	}
  
  	spin_unlock_irqrestore(&adapter->stats_lock, flags);
  }
  
  /**
   * e1000_intr - Interrupt Handler
   * @irq: interrupt number
   * @data: pointer to a network interface device structure
   **/
  static irqreturn_t e1000_intr(int irq, void *data)
  {
  	struct net_device *netdev = data;
  	struct e1000_adapter *adapter = netdev_priv(netdev);
  	struct e1000_hw *hw = &adapter->hw;
  	u32 icr = er32(ICR);
  
  	if (unlikely((!icr)))
  		return IRQ_NONE;  /* Not our interrupt */
  
  	/* we might have caused the interrupt, but the above
  	 * read cleared it, and just in case the driver is
  	 * down there is nothing to do so return handled
  	 */
  	if (unlikely(test_bit(__E1000_DOWN, &adapter->flags)))
  		return IRQ_HANDLED;
  
  	if (unlikely(icr & (E1000_ICR_RXSEQ | E1000_ICR_LSC))) {
  		hw->get_link_status = 1;
  		/* guard against interrupt when we're going down */
  		if (!test_bit(__E1000_DOWN, &adapter->flags))
  			schedule_delayed_work(&adapter->watchdog_task, 1);
  	}
  
  	/* disable interrupts, without the synchronize_irq bit */
  	ew32(IMC, ~0);
  	E1000_WRITE_FLUSH();
  
  	if (likely(napi_schedule_prep(&adapter->napi))) {
  		adapter->total_tx_bytes = 0;
  		adapter->total_tx_packets = 0;
  		adapter->total_rx_bytes = 0;
  		adapter->total_rx_packets = 0;
  		__napi_schedule(&adapter->napi);
  	} else {
  		/* this really should not happen! if it does it is basically a
  		 * bug, but not a hard error, so enable ints and continue
  		 */
  		if (!test_bit(__E1000_DOWN, &adapter->flags))
  			e1000_irq_enable(adapter);
  	}
  
  	return IRQ_HANDLED;
  }
  
  /**
   * e1000_clean - NAPI Rx polling callback
   * @napi: napi struct containing references to driver info
   * @budget: budget given to driver for receive packets
   **/
  static int e1000_clean(struct napi_struct *napi, int budget)
  {
  	struct e1000_adapter *adapter = container_of(napi, struct e1000_adapter,
  						     napi);
  	int tx_clean_complete = 0, work_done = 0;
  
  	tx_clean_complete = e1000_clean_tx_irq(adapter, &adapter->tx_ring[0]);
  
  	adapter->clean_rx(adapter, &adapter->rx_ring[0], &work_done, budget);
  
  	if (!tx_clean_complete || work_done == budget)
  		return budget;
  
  	/* Exit the polling mode, but don't re-enable interrupts if stack might
  	 * poll us due to busy-polling
  	 */
  	if (likely(napi_complete_done(napi, work_done))) {
  		if (likely(adapter->itr_setting & 3))
  			e1000_set_itr(adapter);
  		if (!test_bit(__E1000_DOWN, &adapter->flags))
  			e1000_irq_enable(adapter);
  	}
  
  	return work_done;
  }
  
  /**
   * e1000_clean_tx_irq - Reclaim resources after transmit completes
   * @adapter: board private structure
   * @tx_ring: ring to clean
   **/
  static bool e1000_clean_tx_irq(struct e1000_adapter *adapter,
  			       struct e1000_tx_ring *tx_ring)
  {
  	struct e1000_hw *hw = &adapter->hw;
  	struct net_device *netdev = adapter->netdev;
  	struct e1000_tx_desc *tx_desc, *eop_desc;
  	struct e1000_tx_buffer *buffer_info;
  	unsigned int i, eop;
  	unsigned int count = 0;
  	unsigned int total_tx_bytes = 0, total_tx_packets = 0;
  	unsigned int bytes_compl = 0, pkts_compl = 0;
  
  	i = tx_ring->next_to_clean;
  	eop = tx_ring->buffer_info[i].next_to_watch;
  	eop_desc = E1000_TX_DESC(*tx_ring, eop);
  
  	while ((eop_desc->upper.data & cpu_to_le32(E1000_TXD_STAT_DD)) &&
  	       (count < tx_ring->count)) {
  		bool cleaned = false;
  		dma_rmb();	/* read buffer_info after eop_desc */
  		for ( ; !cleaned; count++) {
  			tx_desc = E1000_TX_DESC(*tx_ring, i);
  			buffer_info = &tx_ring->buffer_info[i];
  			cleaned = (i == eop);
  
  			if (cleaned) {
  				total_tx_packets += buffer_info->segs;
  				total_tx_bytes += buffer_info->bytecount;
  				if (buffer_info->skb) {
  					bytes_compl += buffer_info->skb->len;
  					pkts_compl++;
  				}
  
  			}
  			e1000_unmap_and_free_tx_resource(adapter, buffer_info);
  			tx_desc->upper.data = 0;
  
  			if (unlikely(++i == tx_ring->count))
  				i = 0;
  		}
  
  		eop = tx_ring->buffer_info[i].next_to_watch;
  		eop_desc = E1000_TX_DESC(*tx_ring, eop);
  	}
  
  	/* Synchronize with E1000_DESC_UNUSED called from e1000_xmit_frame,
  	 * which will reuse the cleaned buffers.
  	 */
  	smp_store_release(&tx_ring->next_to_clean, i);
  
  	netdev_completed_queue(netdev, pkts_compl, bytes_compl);
  
  #define TX_WAKE_THRESHOLD 32
  	if (unlikely(count && netif_carrier_ok(netdev) &&
  		     E1000_DESC_UNUSED(tx_ring) >= TX_WAKE_THRESHOLD)) {
  		/* Make sure that anybody stopping the queue after this
  		 * sees the new next_to_clean.
  		 */
  		smp_mb();
  
  		if (netif_queue_stopped(netdev) &&
  		    !(test_bit(__E1000_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 +
  			       (adapter->tx_timeout_factor * HZ)) &&
  		    !(er32(STATUS) & E1000_STATUS_TXOFF)) {
  
  			/* detected Tx unit hang */
  			e_err(drv, "Detected Tx Unit Hang\n"
  			      "  Tx Queue             <%lu>\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",
  				(unsigned long)(tx_ring - adapter->tx_ring),
  				readl(hw->hw_addr + tx_ring->tdh),
  				readl(hw->hw_addr + tx_ring->tdt),
  				tx_ring->next_to_use,
  				tx_ring->next_to_clean,
  				tx_ring->buffer_info[eop].time_stamp,
  				eop,
  				jiffies,
  				eop_desc->upper.fields.status);
  			e1000_dump(adapter);
  			netif_stop_queue(netdev);
  		}
  	}
  	adapter->total_tx_bytes += total_tx_bytes;
  	adapter->total_tx_packets += total_tx_packets;
  	netdev->stats.tx_bytes += total_tx_bytes;
  	netdev->stats.tx_packets += total_tx_packets;
  	return count < tx_ring->count;
  }
  
  /**
   * e1000_rx_checksum - Receive Checksum Offload for 82543
   * @adapter:     board private structure
   * @status_err:  receive descriptor status and error fields
   * @csum:        receive descriptor csum field
   * @skb:         socket buffer with received data
   **/
  static void e1000_rx_checksum(struct e1000_adapter *adapter, u32 status_err,
  			      u32 csum, struct sk_buff *skb)
  {
  	struct e1000_hw *hw = &adapter->hw;
  	u16 status = (u16)status_err;
  	u8 errors = (u8)(status_err >> 24);
  
  	skb_checksum_none_assert(skb);
  
  	/* 82543 or newer only */
  	if (unlikely(hw->mac_type < e1000_82543))
  		return;
  	/* Ignore Checksum bit is set */
  	if (unlikely(status & E1000_RXD_STAT_IXSM))
  		return;
  	/* TCP/UDP checksum error bit is set */
  	if (unlikely(errors & E1000_RXD_ERR_TCPE)) {
  		/* let the stack verify checksum errors */
  		adapter->hw_csum_err++;
  		return;
  	}
  	/* TCP/UDP Checksum has not been calculated */
  	if (!(status & E1000_RXD_STAT_TCPCS))
  		return;
  
  	/* It must be a TCP or UDP packet with a valid checksum */
  	if (likely(status & E1000_RXD_STAT_TCPCS)) {
  		/* TCP checksum is good */
  		skb->ip_summed = CHECKSUM_UNNECESSARY;
  	}
  	adapter->hw_csum_good++;
  }
  
  /**
   * e1000_consume_page - helper function for jumbo Rx path
   * @bi: software descriptor shadow data
   * @skb: skb being modified
   * @length: length of data being added
   **/
  static void e1000_consume_page(struct e1000_rx_buffer *bi, struct sk_buff *skb,
  			       u16 length)
  {
  	bi->rxbuf.page = NULL;
  	skb->len += length;
  	skb->data_len += length;
  	skb->truesize += PAGE_SIZE;
  }
  
  /**
   * e1000_receive_skb - helper function to handle rx indications
   * @adapter: board private structure
   * @status: descriptor status field as written by hardware
   * @vlan: descriptor vlan field as written by hardware (no le/be conversion)
   * @skb: pointer to sk_buff to be indicated to stack
   */
  static void e1000_receive_skb(struct e1000_adapter *adapter, u8 status,
  			      __le16 vlan, struct sk_buff *skb)
  {
  	skb->protocol = eth_type_trans(skb, adapter->netdev);
  
  	if (status & E1000_RXD_STAT_VP) {
  		u16 vid = le16_to_cpu(vlan) & E1000_RXD_SPC_VLAN_MASK;
  
  		__vlan_hwaccel_put_tag(skb, htons(ETH_P_8021Q), vid);
  	}
  	napi_gro_receive(&adapter->napi, skb);
  }
  
  /**
   * e1000_tbi_adjust_stats
   * @hw: Struct containing variables accessed by shared code
   * @stats: point to stats struct
   * @frame_len: The length of the frame in question
   * @mac_addr: The Ethernet destination address of the frame in question
   *
   * Adjusts the statistic counters when a frame is accepted by TBI_ACCEPT
   */
  static void e1000_tbi_adjust_stats(struct e1000_hw *hw,
  				   struct e1000_hw_stats *stats,
  				   u32 frame_len, const u8 *mac_addr)
  {
  	u64 carry_bit;
  
  	/* First adjust the frame length. */
  	frame_len--;
  	/* We need to adjust the statistics counters, since the hardware
  	 * counters overcount this packet as a CRC error and undercount
  	 * the packet as a good packet
  	 */
  	/* This packet should not be counted as a CRC error. */
  	stats->crcerrs--;
  	/* This packet does count as a Good Packet Received. */
  	stats->gprc++;
  
  	/* Adjust the Good Octets received counters */
  	carry_bit = 0x80000000 & stats->gorcl;
  	stats->gorcl += frame_len;
  	/* If the high bit of Gorcl (the low 32 bits of the Good Octets
  	 * Received Count) was one before the addition,
  	 * AND it is zero after, then we lost the carry out,
  	 * need to add one to Gorch (Good Octets Received Count High).
  	 * This could be simplified if all environments supported
  	 * 64-bit integers.
  	 */
  	if (carry_bit && ((stats->gorcl & 0x80000000) == 0))
  		stats->gorch++;
  	/* Is this a broadcast or multicast?  Check broadcast first,
  	 * since the test for a multicast frame will test positive on
  	 * a broadcast frame.
  	 */
  	if (is_broadcast_ether_addr(mac_addr))
  		stats->bprc++;
  	else if (is_multicast_ether_addr(mac_addr))
  		stats->mprc++;
  
  	if (frame_len == hw->max_frame_size) {
  		/* In this case, the hardware has overcounted the number of
  		 * oversize frames.
  		 */
  		if (stats->roc > 0)
  			stats->roc--;
  	}
  
  	/* Adjust the bin counters when the extra byte put the frame in the
  	 * wrong bin. Remember that the frame_len was adjusted above.
  	 */
  	if (frame_len == 64) {
  		stats->prc64++;
  		stats->prc127--;
  	} else if (frame_len == 127) {
  		stats->prc127++;
  		stats->prc255--;
  	} else if (frame_len == 255) {
  		stats->prc255++;
  		stats->prc511--;
  	} else if (frame_len == 511) {
  		stats->prc511++;
  		stats->prc1023--;
  	} else if (frame_len == 1023) {
  		stats->prc1023++;
  		stats->prc1522--;
  	} else if (frame_len == 1522) {
  		stats->prc1522++;
  	}
  }
  
  static bool e1000_tbi_should_accept(struct e1000_adapter *adapter,
  				    u8 status, u8 errors,
  				    u32 length, const u8 *data)
  {
  	struct e1000_hw *hw = &adapter->hw;
  	u8 last_byte = *(data + length - 1);
  
  	if (TBI_ACCEPT(hw, status, errors, length, last_byte)) {
  		unsigned long irq_flags;
  
  		spin_lock_irqsave(&adapter->stats_lock, irq_flags);
  		e1000_tbi_adjust_stats(hw, &adapter->stats, length, data);
  		spin_unlock_irqrestore(&adapter->stats_lock, irq_flags);
  
  		return true;
  	}
  
  	return false;
  }
  
  static struct sk_buff *e1000_alloc_rx_skb(struct e1000_adapter *adapter,
  					  unsigned int bufsz)
  {
  	struct sk_buff *skb = napi_alloc_skb(&adapter->napi, bufsz);
  
  	if (unlikely(!skb))
  		adapter->alloc_rx_buff_failed++;
  	return skb;
  }
  
  /**
   * e1000_clean_jumbo_rx_irq - Send received data up the network stack; legacy
   * @adapter: board private structure
   * @rx_ring: ring to clean
   * @work_done: amount of napi work completed this call
   * @work_to_do: max amount of work allowed for this call to do
   *
   * the return value indicates whether actual cleaning was done, there
   * is no guarantee that everything was cleaned
   */
  static bool e1000_clean_jumbo_rx_irq(struct e1000_adapter *adapter,
  				     struct e1000_rx_ring *rx_ring,
  				     int *work_done, int work_to_do)
  {
  	struct net_device *netdev = adapter->netdev;
  	struct pci_dev *pdev = adapter->pdev;
  	struct e1000_rx_desc *rx_desc, *next_rxd;
  	struct e1000_rx_buffer *buffer_info, *next_buffer;
  	u32 length;
  	unsigned int i;
  	int cleaned_count = 0;
  	bool cleaned = false;
  	unsigned int total_rx_bytes = 0, total_rx_packets = 0;
  
  	i = rx_ring->next_to_clean;
  	rx_desc = E1000_RX_DESC(*rx_ring, i);
  	buffer_info = &rx_ring->buffer_info[i];
  
  	while (rx_desc->status & E1000_RXD_STAT_DD) {
  		struct sk_buff *skb;
  		u8 status;
  
  		if (*work_done >= work_to_do)
  			break;
  		(*work_done)++;
  		dma_rmb(); /* read descriptor and rx_buffer_info after status DD */
  
  		status = rx_desc->status;
  
  		if (++i == rx_ring->count)
  			i = 0;
  
  		next_rxd = E1000_RX_DESC(*rx_ring, i);
  		prefetch(next_rxd);
  
  		next_buffer = &rx_ring->buffer_info[i];
  
  		cleaned = true;
  		cleaned_count++;
  		dma_unmap_page(&pdev->dev, buffer_info->dma,
  			       adapter->rx_buffer_len, DMA_FROM_DEVICE);
  		buffer_info->dma = 0;
  
  		length = le16_to_cpu(rx_desc->length);
  
  		/* errors is only valid for DD + EOP descriptors */
  		if (unlikely((status & E1000_RXD_STAT_EOP) &&
  		    (rx_desc->errors & E1000_RXD_ERR_FRAME_ERR_MASK))) {
  			u8 *mapped = page_address(buffer_info->rxbuf.page);
  
  			if (e1000_tbi_should_accept(adapter, status,
  						    rx_desc->errors,
  						    length, mapped)) {
  				length--;
  			} else if (netdev->features & NETIF_F_RXALL) {
  				goto process_skb;
  			} else {
  				/* an error means any chain goes out the window
  				 * too
  				 */
  				dev_kfree_skb(rx_ring->rx_skb_top);
  				rx_ring->rx_skb_top = NULL;
  				goto next_desc;
  			}
  		}
  
  #define rxtop rx_ring->rx_skb_top
  process_skb:
  		if (!(status & E1000_RXD_STAT_EOP)) {
  			/* this descriptor is only the beginning (or middle) */
  			if (!rxtop) {
  				/* this is the beginning of a chain */
  				rxtop = napi_get_frags(&adapter->napi);
  				if (!rxtop)
  					break;
  
  				skb_fill_page_desc(rxtop, 0,
  						   buffer_info->rxbuf.page,
  						   0, length);
  			} else {
  				/* this is the middle of a chain */
  				skb_fill_page_desc(rxtop,
  				    skb_shinfo(rxtop)->nr_frags,
  				    buffer_info->rxbuf.page, 0, length);
  			}
  			e1000_consume_page(buffer_info, rxtop, length);
  			goto next_desc;
  		} else {
  			if (rxtop) {
  				/* end of the chain */
  				skb_fill_page_desc(rxtop,
  				    skb_shinfo(rxtop)->nr_frags,
  				    buffer_info->rxbuf.page, 0, length);
  				skb = rxtop;
  				rxtop = NULL;
  				e1000_consume_page(buffer_info, skb, length);
  			} else {
  				struct page *p;
  				/* no chain, got EOP, this buf is the packet
  				 * copybreak to save the put_page/alloc_page
  				 */
  				p = buffer_info->rxbuf.page;
  				if (length <= copybreak) {
  					u8 *vaddr;
  
  					if (likely(!(netdev->features & NETIF_F_RXFCS)))
  						length -= 4;
  					skb = e1000_alloc_rx_skb(adapter,
  								 length);
  					if (!skb)
  						break;
  
  					vaddr = kmap_atomic(p);
  					memcpy(skb_tail_pointer(skb), vaddr,
  					       length);
  					kunmap_atomic(vaddr);
  					/* re-use the page, so don't erase
  					 * buffer_info->rxbuf.page
  					 */
  					skb_put(skb, length);
  					e1000_rx_checksum(adapter,
  							  status | rx_desc->errors << 24,
  							  le16_to_cpu(rx_desc->csum), skb);
  
  					total_rx_bytes += skb->len;
  					total_rx_packets++;
  
  					e1000_receive_skb(adapter, status,
  							  rx_desc->special, skb);
  					goto next_desc;
  				} else {
  					skb = napi_get_frags(&adapter->napi);
  					if (!skb) {
  						adapter->alloc_rx_buff_failed++;
  						break;
  					}
  					skb_fill_page_desc(skb, 0, p, 0,
  							   length);
  					e1000_consume_page(buffer_info, skb,
  							   length);
  				}
  			}
  		}
  
  		/* Receive Checksum Offload XXX recompute due to CRC strip? */
  		e1000_rx_checksum(adapter,
  				  (u32)(status) |
  				  ((u32)(rx_desc->errors) << 24),
  				  le16_to_cpu(rx_desc->csum), skb);
  
  		total_rx_bytes += (skb->len - 4); /* don't count FCS */
  		if (likely(!(netdev->features & NETIF_F_RXFCS)))
  			pskb_trim(skb, skb->len - 4);
  		total_rx_packets++;
  
  		if (status & E1000_RXD_STAT_VP) {
  			__le16 vlan = rx_desc->special;
  			u16 vid = le16_to_cpu(vlan) & E1000_RXD_SPC_VLAN_MASK;
  
  			__vlan_hwaccel_put_tag(skb, htons(ETH_P_8021Q), vid);
  		}
  
  		napi_gro_frags(&adapter->napi);
  
  next_desc:
  		rx_desc->status = 0;
  
  		/* return some buffers to hardware, one at a time is too slow */
  		if (unlikely(cleaned_count >= E1000_RX_BUFFER_WRITE)) {
  			adapter->alloc_rx_buf(adapter, rx_ring, cleaned_count);
  			cleaned_count = 0;
  		}
  
  		/* use prefetched values */
  		rx_desc = next_rxd;
  		buffer_info = next_buffer;
  	}
  	rx_ring->next_to_clean = i;
  
  	cleaned_count = E1000_DESC_UNUSED(rx_ring);
  	if (cleaned_count)
  		adapter->alloc_rx_buf(adapter, rx_ring, cleaned_count);
  
  	adapter->total_rx_packets += total_rx_packets;
  	adapter->total_rx_bytes += total_rx_bytes;
  	netdev->stats.rx_bytes += total_rx_bytes;
  	netdev->stats.rx_packets += total_rx_packets;
  	return cleaned;
  }
  
  /* this should improve performance for small packets with large amounts
   * of reassembly being done in the stack
   */
  static struct sk_buff *e1000_copybreak(struct e1000_adapter *adapter,
  				       struct e1000_rx_buffer *buffer_info,
  				       u32 length, const void *data)
  {
  	struct sk_buff *skb;
  
  	if (length > copybreak)
  		return NULL;
  
  	skb = e1000_alloc_rx_skb(adapter, length);
  	if (!skb)
  		return NULL;
  
  	dma_sync_single_for_cpu(&adapter->pdev->dev, buffer_info->dma,
  				length, DMA_FROM_DEVICE);
  
  	skb_put_data(skb, data, length);
  
  	return skb;
  }
  
  /**
   * e1000_clean_rx_irq - Send received data up the network stack; legacy
   * @adapter: board private structure
   * @rx_ring: ring to clean
   * @work_done: amount of napi work completed this call
   * @work_to_do: max amount of work allowed for this call to do
   */
  static bool e1000_clean_rx_irq(struct e1000_adapter *adapter,
  			       struct e1000_rx_ring *rx_ring,
  			       int *work_done, int work_to_do)
  {
  	struct net_device *netdev = adapter->netdev;
  	struct pci_dev *pdev = adapter->pdev;
  	struct e1000_rx_desc *rx_desc, *next_rxd;
  	struct e1000_rx_buffer *buffer_info, *next_buffer;
  	u32 length;
  	unsigned int i;
  	int cleaned_count = 0;
  	bool cleaned = false;
  	unsigned int total_rx_bytes = 0, total_rx_packets = 0;
  
  	i = rx_ring->next_to_clean;
  	rx_desc = E1000_RX_DESC(*rx_ring, i);
  	buffer_info = &rx_ring->buffer_info[i];
  
  	while (rx_desc->status & E1000_RXD_STAT_DD) {
  		struct sk_buff *skb;
  		u8 *data;
  		u8 status;
  
  		if (*work_done >= work_to_do)
  			break;
  		(*work_done)++;
  		dma_rmb(); /* read descriptor and rx_buffer_info after status DD */
  
  		status = rx_desc->status;
  		length = le16_to_cpu(rx_desc->length);
  
  		data = buffer_info->rxbuf.data;
  		prefetch(data);
  		skb = e1000_copybreak(adapter, buffer_info, length, data);
  		if (!skb) {
  			unsigned int frag_len = e1000_frag_len(adapter);
  
  			skb = build_skb(data - E1000_HEADROOM, frag_len);
  			if (!skb) {
  				adapter->alloc_rx_buff_failed++;
  				break;
  			}
  
  			skb_reserve(skb, E1000_HEADROOM);
  			dma_unmap_single(&pdev->dev, buffer_info->dma,
  					 adapter->rx_buffer_len,
  					 DMA_FROM_DEVICE);
  			buffer_info->dma = 0;
  			buffer_info->rxbuf.data = NULL;
  		}
  
  		if (++i == rx_ring->count)
  			i = 0;
  
  		next_rxd = E1000_RX_DESC(*rx_ring, i);
  		prefetch(next_rxd);
  
  		next_buffer = &rx_ring->buffer_info[i];
  
  		cleaned = true;
  		cleaned_count++;
  
  		/* !EOP means multiple descriptors were used to store a single
  		 * packet, if thats the case we need to toss it.  In fact, we
  		 * to toss every packet with the EOP bit clear and the next
  		 * frame that _does_ have the EOP bit set, as it is by
  		 * definition only a frame fragment
  		 */
  		if (unlikely(!(status & E1000_RXD_STAT_EOP)))
  			adapter->discarding = true;
  
  		if (adapter->discarding) {
  			/* All receives must fit into a single buffer */
  			netdev_dbg(netdev, "Receive packet consumed multiple buffers\n");
  			dev_kfree_skb(skb);
  			if (status & E1000_RXD_STAT_EOP)
  				adapter->discarding = false;
  			goto next_desc;
  		}
  
  		if (unlikely(rx_desc->errors & E1000_RXD_ERR_FRAME_ERR_MASK)) {
  			if (e1000_tbi_should_accept(adapter, status,
  						    rx_desc->errors,
  						    length, data)) {
  				length--;
  			} else if (netdev->features & NETIF_F_RXALL) {
  				goto process_skb;
  			} else {
  				dev_kfree_skb(skb);
  				goto next_desc;
  			}
  		}
  
  process_skb:
  		total_rx_bytes += (length - 4); /* don't count FCS */
  		total_rx_packets++;
  
  		if (likely(!(netdev->features & NETIF_F_RXFCS)))
  			/* adjust length to remove Ethernet CRC, this must be
  			 * done after the TBI_ACCEPT workaround above
  			 */
  			length -= 4;
  
  		if (buffer_info->rxbuf.data == NULL)
  			skb_put(skb, length);
  		else /* copybreak skb */
  			skb_trim(skb, length);
  
  		/* Receive Checksum Offload */
  		e1000_rx_checksum(adapter,
  				  (u32)(status) |
  				  ((u32)(rx_desc->errors) << 24),
  				  le16_to_cpu(rx_desc->csum), skb);
  
  		e1000_receive_skb(adapter, status, rx_desc->special, skb);
  
  next_desc:
  		rx_desc->status = 0;
  
  		/* return some buffers to hardware, one at a time is too slow */
  		if (unlikely(cleaned_count >= E1000_RX_BUFFER_WRITE)) {
  			adapter->alloc_rx_buf(adapter, rx_ring, cleaned_count);
  			cleaned_count = 0;
  		}
  
  		/* use prefetched values */
  		rx_desc = next_rxd;
  		buffer_info = next_buffer;
  	}
  	rx_ring->next_to_clean = i;
  
  	cleaned_count = E1000_DESC_UNUSED(rx_ring);
  	if (cleaned_count)
  		adapter->alloc_rx_buf(adapter, rx_ring, cleaned_count);
  
  	adapter->total_rx_packets += total_rx_packets;
  	adapter->total_rx_bytes += total_rx_bytes;
  	netdev->stats.rx_bytes += total_rx_bytes;
  	netdev->stats.rx_packets += total_rx_packets;
  	return cleaned;
  }
  
  /**
   * e1000_alloc_jumbo_rx_buffers - Replace used jumbo receive buffers
   * @adapter: address of board private structure
   * @rx_ring: pointer to receive ring structure
   * @cleaned_count: number of buffers to allocate this pass
   **/
  static void
  e1000_alloc_jumbo_rx_buffers(struct e1000_adapter *adapter,
  			     struct e1000_rx_ring *rx_ring, int cleaned_count)
  {
  	struct pci_dev *pdev = adapter->pdev;
  	struct e1000_rx_desc *rx_desc;
  	struct e1000_rx_buffer *buffer_info;
  	unsigned int i;
  
  	i = rx_ring->next_to_use;
  	buffer_info = &rx_ring->buffer_info[i];
  
  	while (cleaned_count--) {
  		/* allocate a new page if necessary */
  		if (!buffer_info->rxbuf.page) {
  			buffer_info->rxbuf.page = alloc_page(GFP_ATOMIC);
  			if (unlikely(!buffer_info->rxbuf.page)) {
  				adapter->alloc_rx_buff_failed++;
  				break;
  			}
  		}
  
  		if (!buffer_info->dma) {
  			buffer_info->dma = dma_map_page(&pdev->dev,
  							buffer_info->rxbuf.page, 0,
  							adapter->rx_buffer_len,
  							DMA_FROM_DEVICE);
  			if (dma_mapping_error(&pdev->dev, buffer_info->dma)) {
  				put_page(buffer_info->rxbuf.page);
  				buffer_info->rxbuf.page = NULL;
  				buffer_info->dma = 0;
  				adapter->alloc_rx_buff_failed++;
  				break;
  			}
  		}
  
  		rx_desc = E1000_RX_DESC(*rx_ring, i);
  		rx_desc->buffer_addr = cpu_to_le64(buffer_info->dma);
  
  		if (unlikely(++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).
  		 */
  		dma_wmb();
  		writel(i, adapter->hw.hw_addr + rx_ring->rdt);
  	}
  }
  
  /**
   * e1000_alloc_rx_buffers - Replace used receive buffers; legacy & extended
   * @adapter: address of board private structure
   * @rx_ring: pointer to ring struct
   * @cleaned_count: number of new Rx buffers to try to allocate
   **/
  static void e1000_alloc_rx_buffers(struct e1000_adapter *adapter,
  				   struct e1000_rx_ring *rx_ring,
  				   int cleaned_count)
  {
  	struct e1000_hw *hw = &adapter->hw;
  	struct pci_dev *pdev = adapter->pdev;
  	struct e1000_rx_desc *rx_desc;
  	struct e1000_rx_buffer *buffer_info;
  	unsigned int i;
  	unsigned int bufsz = adapter->rx_buffer_len;
  
  	i = rx_ring->next_to_use;
  	buffer_info = &rx_ring->buffer_info[i];
  
  	while (cleaned_count--) {
  		void *data;
  
  		if (buffer_info->rxbuf.data)
  			goto skip;
  
  		data = e1000_alloc_frag(adapter);
  		if (!data) {
  			/* Better luck next round */
  			adapter->alloc_rx_buff_failed++;
  			break;
  		}
  
  		/* Fix for errata 23, can't cross 64kB boundary */
  		if (!e1000_check_64k_bound(adapter, data, bufsz)) {
  			void *olddata = data;
  			e_err(rx_err, "skb align check failed: %u bytes at "
  			      "%p\n", bufsz, data);
  			/* Try again, without freeing the previous */
  			data = e1000_alloc_frag(adapter);
  			/* Failed allocation, critical failure */
  			if (!data) {
  				skb_free_frag(olddata);
  				adapter->alloc_rx_buff_failed++;
  				break;
  			}
  
  			if (!e1000_check_64k_bound(adapter, data, bufsz)) {
  				/* give up */
  				skb_free_frag(data);
  				skb_free_frag(olddata);
  				adapter->alloc_rx_buff_failed++;
  				break;
  			}
  
  			/* Use new allocation */
  			skb_free_frag(olddata);
  		}
  		buffer_info->dma = dma_map_single(&pdev->dev,
  						  data,
  						  adapter->rx_buffer_len,
  						  DMA_FROM_DEVICE);
  		if (dma_mapping_error(&pdev->dev, buffer_info->dma)) {
  			skb_free_frag(data);
  			buffer_info->dma = 0;
  			adapter->alloc_rx_buff_failed++;
  			break;
  		}
  
  		/* XXX if it was allocated cleanly it will never map to a
  		 * boundary crossing
  		 */
  
  		/* Fix for errata 23, can't cross 64kB boundary */
  		if (!e1000_check_64k_bound(adapter,
  					(void *)(unsigned long)buffer_info->dma,
  					adapter->rx_buffer_len)) {
  			e_err(rx_err, "dma align check failed: %u bytes at "
  			      "%p\n", adapter->rx_buffer_len,
  			      (void *)(unsigned long)buffer_info->dma);
  
  			dma_unmap_single(&pdev->dev, buffer_info->dma,
  					 adapter->rx_buffer_len,
  					 DMA_FROM_DEVICE);
  
  			skb_free_frag(data);
  			buffer_info->rxbuf.data = NULL;
  			buffer_info->dma = 0;
  
  			adapter->alloc_rx_buff_failed++;
  			break;
  		}
  		buffer_info->rxbuf.data = data;
   skip:
  		rx_desc = E1000_RX_DESC(*rx_ring, i);
  		rx_desc->buffer_addr = cpu_to_le64(buffer_info->dma);
  
  		if (unlikely(++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).
  		 */
  		dma_wmb();
  		writel(i, hw->hw_addr + rx_ring->rdt);
  	}
  }
  
  /**
   * e1000_smartspeed - Workaround for SmartSpeed on 82541 and 82547 controllers.
   * @adapter: address of board private structure
   **/
  static void e1000_smartspeed(struct e1000_adapter *adapter)
  {
  	struct e1000_hw *hw = &adapter->hw;
  	u16 phy_status;
  	u16 phy_ctrl;
  
  	if ((hw->phy_type != e1000_phy_igp) || !hw->autoneg ||
  	   !(hw->autoneg_advertised & ADVERTISE_1000_FULL))
  		return;
  
  	if (adapter->smartspeed == 0) {
  		/* If Master/Slave config fault is asserted twice,
  		 * we assume back-to-back
  		 */
  		e1000_read_phy_reg(hw, PHY_1000T_STATUS, &phy_status);
  		if (!(phy_status & SR_1000T_MS_CONFIG_FAULT))
  			return;
  		e1000_read_phy_reg(hw, PHY_1000T_STATUS, &phy_status);
  		if (!(phy_status & SR_1000T_MS_CONFIG_FAULT))
  			return;
  		e1000_read_phy_reg(hw, PHY_1000T_CTRL, &phy_ctrl);
  		if (phy_ctrl & CR_1000T_MS_ENABLE) {
  			phy_ctrl &= ~CR_1000T_MS_ENABLE;
  			e1000_write_phy_reg(hw, PHY_1000T_CTRL,
  					    phy_ctrl);
  			adapter->smartspeed++;
  			if (!e1000_phy_setup_autoneg(hw) &&
  			   !e1000_read_phy_reg(hw, PHY_CTRL,
  					       &phy_ctrl)) {
  				phy_ctrl |= (MII_CR_AUTO_NEG_EN |
  					     MII_CR_RESTART_AUTO_NEG);
  				e1000_write_phy_reg(hw, PHY_CTRL,
  						    phy_ctrl);
  			}
  		}
  		return;
  	} else if (adapter->smartspeed == E1000_SMARTSPEED_DOWNSHIFT) {
  		/* If still no link, perhaps using 2/3 pair cable */
  		e1000_read_phy_reg(hw, PHY_1000T_CTRL, &phy_ctrl);
  		phy_ctrl |= CR_1000T_MS_ENABLE;
  		e1000_write_phy_reg(hw, PHY_1000T_CTRL, phy_ctrl);
  		if (!e1000_phy_setup_autoneg(hw) &&
  		   !e1000_read_phy_reg(hw, PHY_CTRL, &phy_ctrl)) {
  			phy_ctrl |= (MII_CR_AUTO_NEG_EN |
  				     MII_CR_RESTART_AUTO_NEG);
  			e1000_write_phy_reg(hw, PHY_CTRL, phy_ctrl);
  		}
  	}
  	/* Restart process after E1000_SMARTSPEED_MAX iterations */
  	if (adapter->smartspeed++ == E1000_SMARTSPEED_MAX)
  		adapter->smartspeed = 0;
  }
  
  /**
   * e1000_ioctl - handle ioctl calls
   * @netdev: pointer to our netdev
   * @ifr: pointer to interface request structure
   * @cmd: ioctl data
   **/
  static int e1000_ioctl(struct net_device *netdev, struct ifreq *ifr, int cmd)
  {
  	switch (cmd) {
  	case SIOCGMIIPHY:
  	case SIOCGMIIREG:
  	case SIOCSMIIREG:
  		return e1000_mii_ioctl(netdev, ifr, cmd);
  	default:
  		return -EOPNOTSUPP;
  	}
  }
  
  /**
   * e1000_mii_ioctl -
   * @netdev: pointer to our netdev
   * @ifr: pointer to interface request structure
   * @cmd: ioctl data
   **/
  static int e1000_mii_ioctl(struct net_device *netdev, struct ifreq *ifr,
  			   int cmd)
  {
  	struct e1000_adapter *adapter = netdev_priv(netdev);
  	struct e1000_hw *hw = &adapter->hw;
  	struct mii_ioctl_data *data = if_mii(ifr);
  	int retval;
  	u16 mii_reg;
  	unsigned long flags;
  
  	if (hw->media_type != e1000_media_type_copper)
  		return -EOPNOTSUPP;
  
  	switch (cmd) {
  	case SIOCGMIIPHY:
  		data->phy_id = hw->phy_addr;
  		break;
  	case SIOCGMIIREG:
  		spin_lock_irqsave(&adapter->stats_lock, flags);
  		if (e1000_read_phy_reg(hw, data->reg_num & 0x1F,
  				   &data->val_out)) {
  			spin_unlock_irqrestore(&adapter->stats_lock, flags);
  			return -EIO;
  		}
  		spin_unlock_irqrestore(&adapter->stats_lock, flags);
  		break;
  	case SIOCSMIIREG:
  		if (data->reg_num & ~(0x1F))
  			return -EFAULT;
  		mii_reg = data->val_in;
  		spin_lock_irqsave(&adapter->stats_lock, flags);
  		if (e1000_write_phy_reg(hw, data->reg_num,
  					mii_reg)) {
  			spin_unlock_irqrestore(&adapter->stats_lock, flags);
  			return -EIO;
  		}
  		spin_unlock_irqrestore(&adapter->stats_lock, flags);
  		if (hw->media_type == e1000_media_type_copper) {
  			switch (data->reg_num) {
  			case PHY_CTRL:
  				if (mii_reg & MII_CR_POWER_DOWN)
  					break;
  				if (mii_reg & MII_CR_AUTO_NEG_EN) {
  					hw->autoneg = 1;
  					hw->autoneg_advertised = 0x2F;
  				} else {
  					u32 speed;
  					if (mii_reg & 0x40)
  						speed = SPEED_1000;
  					else if (mii_reg & 0x2000)
  						speed = SPEED_100;
  					else
  						speed = SPEED_10;
  					retval = e1000_set_spd_dplx(
  						adapter, speed,
  						((mii_reg & 0x100)
  						 ? DUPLEX_FULL :
  						 DUPLEX_HALF));
  					if (retval)
  						return retval;
  				}
  				if (netif_running(adapter->netdev))
  					e1000_reinit_locked(adapter);
  				else
  					e1000_reset(adapter);
  				break;
  			case M88E1000_PHY_SPEC_CTRL:
  			case M88E1000_EXT_PHY_SPEC_CTRL:
  				if (e1000_phy_reset(hw))
  					return -EIO;
  				break;
  			}
  		} else {
  			switch (data->reg_num) {
  			case PHY_CTRL:
  				if (mii_reg & MII_CR_POWER_DOWN)
  					break;
  				if (netif_running(adapter->netdev))
  					e1000_reinit_locked(adapter);
  				else
  					e1000_reset(adapter);
  				break;
  			}
  		}
  		break;
  	default:
  		return -EOPNOTSUPP;
  	}
  	return E1000_SUCCESS;
  }
  
  void e1000_pci_set_mwi(struct e1000_hw *hw)
  {
  	struct e1000_adapter *adapter = hw->back;
  	int ret_val = pci_set_mwi(adapter->pdev);
  
  	if (ret_val)
  		e_err(probe, "Error in setting MWI\n");
  }
  
  void e1000_pci_clear_mwi(struct e1000_hw *hw)
  {
  	struct e1000_adapter *adapter = hw->back;
  
  	pci_clear_mwi(adapter->pdev);
  }
  
  int e1000_pcix_get_mmrbc(struct e1000_hw *hw)
  {
  	struct e1000_adapter *adapter = hw->back;
  	return pcix_get_mmrbc(adapter->pdev);
  }
  
  void e1000_pcix_set_mmrbc(struct e1000_hw *hw, int mmrbc)
  {
  	struct e1000_adapter *adapter = hw->back;
  	pcix_set_mmrbc(adapter->pdev, mmrbc);
  }
  
  void e1000_io_write(struct e1000_hw *hw, unsigned long port, u32 value)
  {
  	outl(value, port);
  }
  
  static bool e1000_vlan_used(struct e1000_adapter *adapter)
  {
  	u16 vid;
  
  	for_each_set_bit(vid, adapter->active_vlans, VLAN_N_VID)
  		return true;
  	return false;
  }
  
  static void __e1000_vlan_mode(struct e1000_adapter *adapter,
  			      netdev_features_t features)
  {
  	struct e1000_hw *hw = &adapter->hw;
  	u32 ctrl;
  
  	ctrl = er32(CTRL);
  	if (features & NETIF_F_HW_VLAN_CTAG_RX) {
  		/* enable VLAN tag insert/strip */
  		ctrl |= E1000_CTRL_VME;
  	} else {
  		/* disable VLAN tag insert/strip */
  		ctrl &= ~E1000_CTRL_VME;
  	}
  	ew32(CTRL, ctrl);
  }
  static void e1000_vlan_filter_on_off(struct e1000_adapter *adapter,
  				     bool filter_on)
  {
  	struct e1000_hw *hw = &adapter->hw;
  	u32 rctl;
  
  	if (!test_bit(__E1000_DOWN, &adapter->flags))
  		e1000_irq_disable(adapter);
  
  	__e1000_vlan_mode(adapter, adapter->netdev->features);
  	if (filter_on) {
  		/* enable VLAN receive filtering */
  		rctl = er32(RCTL);
  		rctl &= ~E1000_RCTL_CFIEN;
  		if (!(adapter->netdev->flags & IFF_PROMISC))
  			rctl |= E1000_RCTL_VFE;
  		ew32(RCTL, rctl);
  		e1000_update_mng_vlan(adapter);
  	} else {
  		/* disable VLAN receive filtering */
  		rctl = er32(RCTL);
  		rctl &= ~E1000_RCTL_VFE;
  		ew32(RCTL, rctl);
  	}
  
  	if (!test_bit(__E1000_DOWN, &adapter->flags))
  		e1000_irq_enable(adapter);
  }
  
  static void e1000_vlan_mode(struct net_device *netdev,
  			    netdev_features_t features)
  {
  	struct e1000_adapter *adapter = netdev_priv(netdev);
  
  	if (!test_bit(__E1000_DOWN, &adapter->flags))
  		e1000_irq_disable(adapter);
  
  	__e1000_vlan_mode(adapter, features);
  
  	if (!test_bit(__E1000_DOWN, &adapter->flags))
  		e1000_irq_enable(adapter);
  }
  
  static int e1000_vlan_rx_add_vid(struct net_device *netdev,
  				 __be16 proto, u16 vid)
  {
  	struct e1000_adapter *adapter = netdev_priv(netdev);
  	struct e1000_hw *hw = &adapter->hw;
  	u32 vfta, index;
  
  	if ((hw->mng_cookie.status &
  	     E1000_MNG_DHCP_COOKIE_STATUS_VLAN_SUPPORT) &&
  	    (vid == adapter->mng_vlan_id))
  		return 0;
  
  	if (!e1000_vlan_used(adapter))
  		e1000_vlan_filter_on_off(adapter, true);
  
  	/* add VID to filter table */
  	index = (vid >> 5) & 0x7F;
  	vfta = E1000_READ_REG_ARRAY(hw, VFTA, index);
  	vfta |= (1 << (vid & 0x1F));
  	e1000_write_vfta(hw, index, vfta);
  
  	set_bit(vid, adapter->active_vlans);
  
  	return 0;
  }
  
  static int e1000_vlan_rx_kill_vid(struct net_device *netdev,
  				  __be16 proto, u16 vid)
  {
  	struct e1000_adapter *adapter = netdev_priv(netdev);
  	struct e1000_hw *hw = &adapter->hw;
  	u32 vfta, index;
  
  	if (!test_bit(__E1000_DOWN, &adapter->flags))
  		e1000_irq_disable(adapter);
  	if (!test_bit(__E1000_DOWN, &adapter->flags))
  		e1000_irq_enable(adapter);
  
  	/* remove VID from filter table */
  	index = (vid >> 5) & 0x7F;
  	vfta = E1000_READ_REG_ARRAY(hw, VFTA, index);
  	vfta &= ~(1 << (vid & 0x1F));
  	e1000_write_vfta(hw, index, vfta);
  
  	clear_bit(vid, adapter->active_vlans);
  
  	if (!e1000_vlan_used(adapter))
  		e1000_vlan_filter_on_off(adapter, false);
  
  	return 0;
  }
  
  static void e1000_restore_vlan(struct e1000_adapter *adapter)
  {
  	u16 vid;
  
  	if (!e1000_vlan_used(adapter))
  		return;
  
  	e1000_vlan_filter_on_off(adapter, true);
  	for_each_set_bit(vid, adapter->active_vlans, VLAN_N_VID)
  		e1000_vlan_rx_add_vid(adapter->netdev, htons(ETH_P_8021Q), vid);
  }
  
  int e1000_set_spd_dplx(struct e1000_adapter *adapter, u32 spd, u8 dplx)
  {
  	struct e1000_hw *hw = &adapter->hw;
  
  	hw->autoneg = 0;
  
  	/* Make sure dplx is at most 1 bit and lsb of speed is not set
  	 * for the switch() below to work
  	 */
  	if ((spd & 1) || (dplx & ~1))
  		goto err_inval;
  
  	/* Fiber NICs only allow 1000 gbps Full duplex */
  	if ((hw->media_type == e1000_media_type_fiber) &&
  	    spd != SPEED_1000 &&
  	    dplx != DUPLEX_FULL)
  		goto err_inval;
  
  	switch (spd + dplx) {
  	case SPEED_10 + DUPLEX_HALF:
  		hw->forced_speed_duplex = e1000_10_half;
  		break;
  	case SPEED_10 + DUPLEX_FULL:
  		hw->forced_speed_duplex = e1000_10_full;
  		break;
  	case SPEED_100 + DUPLEX_HALF:
  		hw->forced_speed_duplex = e1000_100_half;
  		break;
  	case SPEED_100 + DUPLEX_FULL:
  		hw->forced_speed_duplex = e1000_100_full;
  		break;
  	case SPEED_1000 + DUPLEX_FULL:
  		hw->autoneg = 1;
  		hw->autoneg_advertised = ADVERTISE_1000_FULL;
  		break;
  	case SPEED_1000 + DUPLEX_HALF: /* not supported */
  	default:
  		goto err_inval;
  	}
  
  	/* clear MDI, MDI(-X) override is only allowed when autoneg enabled */
  	hw->mdix = AUTO_ALL_MODES;
  
  	return 0;
  
  err_inval:
  	e_err(probe, "Unsupported Speed/Duplex configuration\n");
  	return -EINVAL;
  }
  
  static int __e1000_shutdown(struct pci_dev *pdev, bool *enable_wake)
  {
  	struct net_device *netdev = pci_get_drvdata(pdev);
  	struct e1000_adapter *adapter = netdev_priv(netdev);
  	struct e1000_hw *hw = &adapter->hw;
  	u32 ctrl, ctrl_ext, rctl, status;
  	u32 wufc = adapter->wol;
  
  	netif_device_detach(netdev);
  
  	if (netif_running(netdev)) {
  		int count = E1000_CHECK_RESET_COUNT;
  
  		while (test_bit(__E1000_RESETTING, &adapter->flags) && count--)
  			usleep_range(10000, 20000);
  
  		WARN_ON(test_bit(__E1000_RESETTING, &adapter->flags));
  		e1000_down(adapter);
  	}
  
  	status = er32(STATUS);
  	if (status & E1000_STATUS_LU)
  		wufc &= ~E1000_WUFC_LNKC;
  
  	if (wufc) {
  		e1000_setup_rctl(adapter);
  		e1000_set_rx_mode(netdev);
  
  		rctl = er32(RCTL);
  
  		/* turn on all-multi mode if wake on multicast is enabled */
  		if (wufc & E1000_WUFC_MC)
  			rctl |= E1000_RCTL_MPE;
  
  		/* enable receives in the hardware */
  		ew32(RCTL, rctl | E1000_RCTL_EN);
  
  		if (hw->mac_type >= e1000_82540) {
  			ctrl = er32(CTRL);
  			/* advertise wake from D3Cold */
  			#define E1000_CTRL_ADVD3WUC 0x00100000
  			/* phy power management enable */
  			#define E1000_CTRL_EN_PHY_PWR_MGMT 0x00200000
  			ctrl |= E1000_CTRL_ADVD3WUC |
  				E1000_CTRL_EN_PHY_PWR_MGMT;
  			ew32(CTRL, ctrl);
  		}
  
  		if (hw->media_type == e1000_media_type_fiber ||
  		    hw->media_type == e1000_media_type_internal_serdes) {
  			/* keep the laser running in D3 */
  			ctrl_ext = er32(CTRL_EXT);
  			ctrl_ext |= E1000_CTRL_EXT_SDP7_DATA;
  			ew32(CTRL_EXT, ctrl_ext);
  		}
  
  		ew32(WUC, E1000_WUC_PME_EN);
  		ew32(WUFC, wufc);
  	} else {
  		ew32(WUC, 0);
  		ew32(WUFC, 0);
  	}
  
  	e1000_release_manageability(adapter);
  
  	*enable_wake = !!wufc;
  
  	/* make sure adapter isn't asleep if manageability is enabled */
  	if (adapter->en_mng_pt)
  		*enable_wake = true;
  
  	if (netif_running(netdev))
  		e1000_free_irq(adapter);
  
  	if (!test_and_set_bit(__E1000_DISABLED, &adapter->flags))
  		pci_disable_device(pdev);
  
  	return 0;
  }
  
  static int __maybe_unused e1000_suspend(struct device *dev)
  {
  	int retval;
  	struct pci_dev *pdev = to_pci_dev(dev);
  	bool wake;
  
  	retval = __e1000_shutdown(pdev, &wake);
  	device_set_wakeup_enable(dev, wake);
  
  	return retval;
  }
  
  static int __maybe_unused e1000_resume(struct device *dev)
  {
  	struct pci_dev *pdev = to_pci_dev(dev);
  	struct net_device *netdev = pci_get_drvdata(pdev);
  	struct e1000_adapter *adapter = netdev_priv(netdev);
  	struct e1000_hw *hw = &adapter->hw;
  	u32 err;
  
  	if (adapter->need_ioport)
  		err = pci_enable_device(pdev);
  	else
  		err = pci_enable_device_mem(pdev);
  	if (err) {
  		pr_err("Cannot enable PCI device from suspend\n");
  		return err;
  	}
  
  	/* flush memory to make sure state is correct */
  	smp_mb__before_atomic();
  	clear_bit(__E1000_DISABLED, &adapter->flags);
  	pci_set_master(pdev);
  
  	pci_enable_wake(pdev, PCI_D3hot, 0);
  	pci_enable_wake(pdev, PCI_D3cold, 0);
  
  	if (netif_running(netdev)) {
  		err = e1000_request_irq(adapter);
  		if (err)
  			return err;
  	}
  
  	e1000_power_up_phy(adapter);
  	e1000_reset(adapter);
  	ew32(WUS, ~0);
  
  	e1000_init_manageability(adapter);
  
  	if (netif_running(netdev))
  		e1000_up(adapter);
  
  	netif_device_attach(netdev);
  
  	return 0;
  }
  
  static void e1000_shutdown(struct pci_dev *pdev)
  {
  	bool wake;
  
  	__e1000_shutdown(pdev, &wake);
  
  	if (system_state == SYSTEM_POWER_OFF) {
  		pci_wake_from_d3(pdev, wake);
  		pci_set_power_state(pdev, PCI_D3hot);
  	}
  }
  
  #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 e1000_netpoll(struct net_device *netdev)
  {
  	struct e1000_adapter *adapter = netdev_priv(netdev);
  
  	if (disable_hardirq(adapter->pdev->irq))
  		e1000_intr(adapter->pdev->irq, netdev);
  	enable_irq(adapter->pdev->irq);
  }
  #endif
  
  /**
   * e1000_io_error_detected - called when PCI error is detected
   * @pdev: Pointer to PCI device
   * @state: The current pci connection state
   *
   * This function is called after a PCI bus error affecting
   * this device has been detected.
   */
  static pci_ers_result_t e1000_io_error_detected(struct pci_dev *pdev,
  						pci_channel_state_t state)
  {
  	struct net_device *netdev = pci_get_drvdata(pdev);
  	struct e1000_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))
  		e1000_down(adapter);
  
  	if (!test_and_set_bit(__E1000_DISABLED, &adapter->flags))
  		pci_disable_device(pdev);
  
  	/* Request a slot reset. */
  	return PCI_ERS_RESULT_NEED_RESET;
  }
  
  /**
   * e1000_io_slot_reset - called after the pci bus has been reset.
   * @pdev: Pointer to PCI device
   *
   * Restart the card from scratch, as if from a cold-boot. Implementation
   * resembles the first-half of the e1000_resume routine.
   */
  static pci_ers_result_t e1000_io_slot_reset(struct pci_dev *pdev)
  {
  	struct net_device *netdev = pci_get_drvdata(pdev);
  	struct e1000_adapter *adapter = netdev_priv(netdev);
  	struct e1000_hw *hw = &adapter->hw;
  	int err;
  
  	if (adapter->need_ioport)
  		err = pci_enable_device(pdev);
  	else
  		err = pci_enable_device_mem(pdev);
  	if (err) {
  		pr_err("Cannot re-enable PCI device after reset.\n");
  		return PCI_ERS_RESULT_DISCONNECT;
  	}
  
  	/* flush memory to make sure state is correct */
  	smp_mb__before_atomic();
  	clear_bit(__E1000_DISABLED, &adapter->flags);
  	pci_set_master(pdev);
  
  	pci_enable_wake(pdev, PCI_D3hot, 0);
  	pci_enable_wake(pdev, PCI_D3cold, 0);
  
  	e1000_reset(adapter);
  	ew32(WUS, ~0);
  
  	return PCI_ERS_RESULT_RECOVERED;
  }
  
  /**
   * e1000_io_resume - called when traffic can start flowing again.
   * @pdev: Pointer to PCI device
   *
   * This callback is called when the error recovery driver tells us that
   * its OK to resume normal operation. Implementation resembles the
   * second-half of the e1000_resume routine.
   */
  static void e1000_io_resume(struct pci_dev *pdev)
  {
  	struct net_device *netdev = pci_get_drvdata(pdev);
  	struct e1000_adapter *adapter = netdev_priv(netdev);
  
  	e1000_init_manageability(adapter);
  
  	if (netif_running(netdev)) {
  		if (e1000_up(adapter)) {
  			pr_info("can't bring device back up after reset\n");
  			return;
  		}
  	}
  
  	netif_device_attach(netdev);
  }
  
  /* e1000_main.c */
  