e1000_main-2.6.37-ethercat.c

/*******************************************************************************

  Intel PRO/1000 Linux driver
  Copyright(c) 1999 - 2006 Intel Corporation.

  This program is free software; you can redistribute it and/or modify it
  under the terms and conditions of the GNU General Public License,
  version 2, as published by the Free Software Foundation.

  This program is distributed in the hope it will be useful, but WITHOUT
  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  more details.

  You should have received a copy of the GNU General Public License along with
  this program; if not, write to the Free Software Foundation, Inc.,
  51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.

  The full GNU General Public License is included in this distribution in
  the file called "COPYING".

  Contact Information:
  Linux NICS <linux.nics@intel.com>
  e1000-devel Mailing List <e1000-devel@lists.sourceforge.net>
  Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
 
  vim: noexpandtab

*******************************************************************************/

#include "e1000-2.6.37-ethercat.h"
#include <net/ip6_checksum.h>

char e1000_driver_name[] = "ec_e1000";
static char e1000_driver_string[] = "Intel(R) PRO/1000 Network Driver";
#define DRV_VERSION "7.3.21-k8-NAPI"
const char e1000_driver_version[] = DRV_VERSION;
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 DEFINE_PCI_DEVICE_TABLE(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),
	/* required last entry */
	{0,}
};

// do not auto-load driver
// 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_set_spd_dplx(struct e1000_adapter *adapter, u16 spddplx);
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 __devexit e1000_remove(struct pci_dev *pdev);
static int e1000_alloc_queues(struct e1000_adapter *adapter);
static int e1000_sw_init(struct e1000_adapter *adapter);
static int e1000_open(struct net_device *netdev);
static 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(unsigned long data);
static void e1000_update_phy_info_task(struct work_struct *work);
static void e1000_watchdog(unsigned long data);
static void e1000_82547_tx_fifo_stall(unsigned long data);
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 struct net_device_stats * e1000_get_stats(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);
void ec_poll(struct net_device *);
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_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);
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 void e1000_vlan_rx_register(struct net_device *netdev, struct vlan_group *grp);
static void e1000_vlan_rx_add_vid(struct net_device *netdev, u16 vid);
static void e1000_vlan_rx_kill_vid(struct net_device *netdev, u16 vid);
static void e1000_restore_vlan(struct e1000_adapter *adapter);

#ifdef CONFIG_PM
static int e1000_suspend(struct pci_dev *pdev, pm_message_t state);
static int e1000_resume(struct pci_dev *pdev);
#endif
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 struct pci_error_handlers e1000_err_handler = {
	.error_detected = e1000_io_error_detected,
	.slot_reset = e1000_io_slot_reset,
	.resume = e1000_io_resume,
};

static struct pci_driver e1000_driver = {
	.name     = e1000_driver_name,
	.id_table = e1000_pci_tbl,
	.probe    = e1000_probe,
	.remove   = __devexit_p(e1000_remove),
#ifdef CONFIG_PM
	/* Power Managment Hooks */
	.suspend  = e1000_suspend,
	.resume   = e1000_resume,
#endif
	.shutdown = e1000_shutdown,
	.err_handler = &e1000_err_handler
};

MODULE_AUTHOR("Florian Pose <fp@igh-essen.com>");
MODULE_DESCRIPTION("EtherCAT-capable Intel(R) PRO/1000 Network Driver");
MODULE_LICENSE("GPL");
MODULE_VERSION(DRV_VERSION);

static int debug = NETIF_MSG_DRV | NETIF_MSG_PROBE;
module_param(debug, int, 0);
MODULE_PARM_DESC(debug, "Debug level (0=none,...,16=all)");

/**
 * e1000_get_hw_dev - 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 - version %s\n", e1000_driver_string, e1000_driver_version);

	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;

	if (adapter->ecdev)
		return 0;

	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;

	if (adapter->ecdev)
		return;

	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;

	if (adapter->ecdev)
		return;

	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;

	if (adapter->ecdev)
		return;
 
	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 (adapter->vlgrp) {
		if (!vlan_group_get_device(adapter->vlgrp, vid)) {
			if (hw->mng_cookie.status &
				E1000_MNG_DHCP_COOKIE_STATUS_VLAN_SUPPORT) {
				e1000_vlan_rx_add_vid(netdev, 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) &&
			    !vlan_group_get_device(adapter->vlgrp, old_vid))
				e1000_vlan_rx_kill_vid(netdev, 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];
		if (adapter->ecdev) {
			/* fill rx ring completely! */
			adapter->alloc_rx_buf(adapter, ring, ring->count);
		} else {
            /* this one leaves the last ring element unallocated! */
			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);

	if (!adapter->ecdev) {
		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_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);
		mdelay(1);
	}
out:
	return;
}

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);

	if (!adapter->ecdev) {
		/* 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);

	if (!adapter->ecdev) {
		napi_disable(&adapter->napi);

		e1000_irq_disable(adapter);
	}

	/*
	 * Setting DOWN must be after irq_disable to prevent
	 * a screaming interrupt.  Setting DOWN also prevents
	 * timers and tasks from rescheduling.
	 */
	set_bit(__E1000_DOWN, &adapter->flags);

	if (!adapter->ecdev) {
		del_timer_sync(&adapter->tx_fifo_stall_timer);
		del_timer_sync(&adapter->watchdog_timer);
		del_timer_sync(&adapter->phy_info_timer);
	}

	adapter->link_speed = 0;
	adapter->link_duplex = 0;
	if (!adapter->ecdev) {
		netif_carrier_off(netdev);
	}

	e1000_reset(adapter);
	e1000_clean_all_tx_rings(adapter);
	e1000_clean_all_rx_rings(adapter);
}

static void e1000_reinit_safe(struct e1000_adapter *adapter)
{
	while (test_and_set_bit(__E1000_RESETTING, &adapter->flags))
		msleep(1);
	rtnl_lock();
	e1000_down(adapter);
	e1000_up(adapter);
	rtnl_unlock();
	clear_bit(__E1000_RESETTING, &adapter->flags);
}

void e1000_reinit_locked(struct e1000_adapter *adapter)
{
	/* if rtnl_lock is not held the call path is bogus */
	ASSERT_RTNL();
	WARN_ON(in_interrupt());
	while (test_and_set_bit(__E1000_RESETTING, &adapter->flags))
		msleep(1);
	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_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) {
		pr_err("Unable to allocate memory to dump EEPROM data\n");
		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 const struct net_device_ops e1000_netdev_ops = {
	.ndo_open		= e1000_open,
	.ndo_stop		= e1000_close,
	.ndo_start_xmit		= e1000_xmit_frame,
	.ndo_get_stats		= e1000_get_stats,
	.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_do_ioctl		= e1000_ioctl,
	.ndo_validate_addr	= eth_validate_addr,

	.ndo_vlan_rx_register	= e1000_vlan_rx_register,
	.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
};

/**
 * 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 __devinit e1000_probe(struct pci_dev *pdev,
				 const struct pci_device_id *ent)
{
	struct net_device *netdev;
	struct e1000_adapter *adapter;
	struct e1000_hw *hw;

	static int cards_found = 0;
	static int global_quad_port_a = 0; /* global ksp3 port a indication */
	int i, err, pci_using_dac;
	u16 eeprom_data = 0;
	u16 eeprom_apme_mask = E1000_EEPROM_APME;
	int bars, need_ioport;

	/* 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 = (1 << debug) - 1;
	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 <= BAR_5; 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(&pdev->dev, DMA_BIT_MASK(64))) {
		/*