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

  
  Copyright(c) 1999 - 2002 Intel Corporation. All rights reserved.
  
  This program is free software; you can redistribute it and/or modify it 
  under the terms of the GNU General Public License as published by the Free 
  Software Foundation; either version 2 of the License, or (at your option) 
  any later version.
  
  This program is distributed in the hope that 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., 59 
  Temple Place - Suite 330, Boston, MA  02111-1307, USA.
  
  The full GNU General Public License is included in this distribution in the
  file called LICENSE.
  
  Contact Information:
  Linux NICS <linux.nics@intel.com>
  Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497

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

#define __E1000_MAIN__
#include "e1000.h"

/* Change Log
 *
 *   o Feature: merged in modified NAPI patch from Robert Olsson
 *     <Robert.Olsson@its.uu.se> Uppsala Univeristy, Sweden.
 *
 * 4.3.15      8/9/02
 *   o Converted from Dual BSD/GPL license to GPL license.
 *   o Clean up: use pci_[clear|set]_mwi rather than direct calls to
 *     pci_write_config_word.
 *   o Bug fix: added read-behind-write calls to post writes before delays.
 *   o Bug fix: removed mdelay busy-waits in interrupt context.
 *   o Clean up: direct clear of descriptor bits rather than using memset.
 *   o Bug fix: added wmb() for ia-64 between descritor writes and advancing
 *     descriptor tail.
 *   o Feature: added locking mechanism for asf functionality.
 *   o Feature: exposed two Tx and one Rx interrupt delay knobs for finer
 *     control over interurpt rate tuning.
 *   o Misc ethtool bug fixes.
 *         
 * 4.3.2       7/5/02
 *   o Bug fix: perform controller reset using I/O rather than mmio because
 *     some chipsets try to perform a 64-bit write, but the controller ignores
 *     the upper 32-bit write once the reset is intiated by the lower 32-bit
 *     write, causing a master abort.
 *   o Bug fix: fixed jumbo frames sized from 1514 to 2048.
 *   o ASF support: disable ARP when driver is loaded or resumed; enable when 
 *     driver is removed or suspended.
 *   o Bug fix: changed default setting for RxIntDelay to 0 for 82542/3/4
 *     controllers to workaround h/w errata where controller will hang when
 *     RxIntDelay <> 0 under certian network conditions.
 *   o Clean up: removed unused and undocumented user-settable settings for
 *     PHY.
 *   o Bug fix: ethtool GEEPROM was using byte address rather than word
 *     addressing.
 *   o Feature: added support for ethtool SEEPROM.
 *   o Feature: added support for entropy pool.
 *
 * 4.2.17      5/30/02
 */
 
char e1000_driver_name[] = "e1000";
char e1000_driver_string[] = "Intel(R) PRO/1000 Network Driver";
char e1000_driver_version[] = "4.3.15-k1";
char e1000_copyright[] = "Copyright (c) 1999-2002 Intel Corporation.";

/* e1000_pci_tbl - PCI Device ID Table
 *
 * Private driver_data field (last one) stores an index into e1000_strings
 * Wildcard entries (PCI_ANY_ID) should come last
 * Last entry must be all 0s
 *
 * { Vendor ID, Device ID, SubVendor ID, SubDevice ID,
 *   Class, Class Mask, String Index }
 */
static struct pci_device_id e1000_pci_tbl[] __devinitdata = {
        /* Intel(R) PRO/1000 Network Connection */
        {0x8086, 0x1000, 0x8086, 0x1000, 0, 0, 0},
        {0x8086, 0x1001, 0x8086, 0x1003, 0, 0, 0},
        {0x8086, 0x1004, 0x8086, 0x1004, 0, 0, 0},
        {0x8086, 0x1008, 0x8086, 0x1107, 0, 0, 0},
        {0x8086, 0x1009, 0x8086, 0x1109, 0, 0, 0},
        {0x8086, 0x100C, 0x8086, 0x1112, 0, 0, 0},
        {0x8086, 0x100E, 0x8086, 0x001E, 0, 0, 0},
        /* Compaq Gigabit Ethernet Server Adapter */
        {0x8086, 0x1000, 0x0E11, PCI_ANY_ID, 0, 0, 1},
        {0x8086, 0x1001, 0x0E11, PCI_ANY_ID, 0, 0, 1},
        {0x8086, 0x1004, 0x0E11, PCI_ANY_ID, 0, 0, 1},
        /* IBM Mobile, Desktop & Server Adapters */
        {0x8086, 0x1000, 0x1014, PCI_ANY_ID, 0, 0, 2},
        {0x8086, 0x1001, 0x1014, PCI_ANY_ID, 0, 0, 2},
        {0x8086, 0x1004, 0x1014, PCI_ANY_ID, 0, 0, 2},
        /* Generic */
        {0x8086, 0x1000, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
        {0x8086, 0x1001, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
        {0x8086, 0x1004, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
        {0x8086, 0x1008, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
        {0x8086, 0x1009, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
        {0x8086, 0x100C, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
        {0x8086, 0x100D, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
        {0x8086, 0x100E, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
        {0x8086, 0x100F, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
        {0x8086, 0x1011, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
        {0x8086, 0x1010, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
        {0x8086, 0x1012, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
        /* required last entry */
        {0,}
};

MODULE_DEVICE_TABLE(pci, e1000_pci_tbl);

static char *e1000_strings[] = {
        "Intel(R) PRO/1000 Network Connection",
        "Compaq Gigabit Ethernet Server Adapter",
        "IBM Mobile, Desktop & Server Adapters"
};

/* Local Function Prototypes */

int e1000_up(struct e1000_adapter *adapter);
void e1000_down(struct e1000_adapter *adapter);
void e1000_reset(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 void e1000_sw_init(struct e1000_adapter *adapter);
static int e1000_open(struct net_device *netdev);
static int e1000_close(struct net_device *netdev);
static int e1000_setup_tx_resources(struct e1000_adapter *adapter);
static int e1000_setup_rx_resources(struct e1000_adapter *adapter);
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_tx_ring(struct e1000_adapter *adapter);
static void e1000_clean_rx_ring(struct e1000_adapter *adapter);
static void e1000_free_tx_resources(struct e1000_adapter *adapter);
static void e1000_free_rx_resources(struct e1000_adapter *adapter);
static void e1000_set_multi(struct net_device *netdev);
static void e1000_update_phy_info(unsigned long data);
static void e1000_watchdog(unsigned long data);
static int 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);
static void e1000_update_stats(struct e1000_adapter *adapter);
static inline void e1000_irq_disable(struct e1000_adapter *adapter);
static inline void e1000_irq_enable(struct e1000_adapter *adapter);
static void e1000_intr(int irq, void *data, struct pt_regs *regs);
static void e1000_clean_tx_irq(struct e1000_adapter *adapter);
#ifdef CONFIG_E1000_NAPI
static int e1000_poll(struct net_device *netdev, int *budget);
#else
static void e1000_clean_rx_irq(struct e1000_adapter *adapter);
#endif
static void e1000_alloc_rx_buffers(struct e1000_adapter *adapter);
static int e1000_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 inline void e1000_rx_checksum(struct e1000_adapter *adapter,
                                     struct e1000_rx_desc *rx_desc,
                                     struct sk_buff *skb);
static void e1000_tx_timeout(struct net_device *dev);
static void e1000_tx_timeout_task(struct net_device *dev);

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, uint16_t vid);
static void e1000_vlan_rx_kill_vid(struct net_device *netdev, uint16_t vid);

static int e1000_notify_reboot(struct notifier_block *, unsigned long event, void *ptr);
static int e1000_suspend(struct pci_dev *pdev, uint32_t state);
#ifdef CONFIG_PM
static int e1000_resume(struct pci_dev *pdev);
#endif

struct notifier_block e1000_notifier = {
        .notifier_call  = e1000_notify_reboot,
        .next           = NULL,
        .priority       = 0
};

/* Exported from other modules */

extern void e1000_check_options(struct e1000_adapter *adapter);
extern void e1000_proc_dev_setup(struct e1000_adapter *adapter);
extern void e1000_proc_dev_free(struct e1000_adapter *adapter);
extern int e1000_ethtool_ioctl(struct net_device *netdev, struct ifreq *ifr);

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

MODULE_AUTHOR("Intel Corporation, <linux.nics@intel.com>");
MODULE_DESCRIPTION("Intel(R) PRO/1000 Network Driver");
MODULE_LICENSE("GPL");

/**
 * 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;
        printk(KERN_INFO "%s - version %s\n",
               e1000_driver_string, e1000_driver_version);

        printk(KERN_INFO "%s\n", e1000_copyright);

        ret = pci_module_init(&e1000_driver);
        if(ret >= 0)
                register_reboot_notifier(&e1000_notifier);
        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)
{
        unregister_reboot_notifier(&e1000_notifier);
        pci_unregister_driver(&e1000_driver);
}

module_exit(e1000_exit_module);


int
e1000_up(struct e1000_adapter *adapter)
{
        struct net_device *netdev = adapter->netdev;

        if(request_irq(netdev->irq, &e1000_intr, SA_SHIRQ | SA_SAMPLE_RANDOM,
                       netdev->name, netdev))
                return -1;

        /* hardware has been reset, we need to reload some things */

        e1000_set_multi(netdev);

        e1000_configure_tx(adapter);
        e1000_setup_rctl(adapter);
        e1000_configure_rx(adapter);
        e1000_alloc_rx_buffers(adapter);

        mod_timer(&adapter->watchdog_timer, jiffies);
        e1000_irq_enable(adapter);

        return 0;
}

void
e1000_down(struct e1000_adapter *adapter)
{
        struct net_device *netdev = adapter->netdev;

        e1000_irq_disable(adapter);
        free_irq(netdev->irq, netdev);
        del_timer_sync(&adapter->watchdog_timer);
        del_timer_sync(&adapter->phy_info_timer);
        adapter->link_speed = 0;
        adapter->link_duplex = 0;
        netif_carrier_off(netdev);
        netif_stop_queue(netdev);

        e1000_reset(adapter);
        e1000_clean_tx_ring(adapter);
        e1000_clean_rx_ring(adapter);
}

void
e1000_reset(struct e1000_adapter *adapter)
{
        /* Repartition Pba for greater than 9k mtu
         * To take effect CTRL.RST is required.
         */

        if(adapter->rx_buffer_len > E1000_RXBUFFER_8192)
                E1000_WRITE_REG(&adapter->hw, PBA, E1000_JUMBO_PBA);
        else
                E1000_WRITE_REG(&adapter->hw, PBA, E1000_DEFAULT_PBA);

        adapter->hw.fc = adapter->hw.original_fc;
        e1000_reset_hw(&adapter->hw);
        if(adapter->hw.mac_type >= e1000_82544)
                E1000_WRITE_REG(&adapter->hw, WUC, 0);
        e1000_init_hw(&adapter->hw);
        e1000_reset_adaptive(&adapter->hw);
        e1000_phy_get_info(&adapter->hw, &adapter->phy_info);
}

/**
 * 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;
        static int cards_found = 0;
        unsigned long mmio_start;
        int mmio_len;
        int pci_using_dac;
        int i;

        if((i = pci_enable_device(pdev)))
                return i;

        if(!(i = pci_set_dma_mask(pdev, PCI_DMA_64BIT))) {
                pci_using_dac = 1;
        } else {
                if((i = pci_set_dma_mask(pdev, PCI_DMA_32BIT))) {
                        E1000_ERR("No usable DMA configuration, aborting\n");
                        return i;
                }
                pci_using_dac = 0;
        }

        if((i = pci_request_regions(pdev, e1000_driver_name)))
                return i;

        pci_set_master(pdev);

        netdev = alloc_etherdev(sizeof(struct e1000_adapter));
        if(!netdev)
                goto err_alloc_etherdev;

        SET_MODULE_OWNER(netdev);

        pci_set_drvdata(pdev, netdev);
        adapter = netdev->priv;
        adapter->netdev = netdev;
        adapter->pdev = pdev;
        adapter->hw.back = adapter;

        mmio_start = pci_resource_start(pdev, BAR_0);
        mmio_len = pci_resource_len(pdev, BAR_0);

        adapter->hw.hw_addr = ioremap(mmio_start, mmio_len);
        if(!adapter->hw.hw_addr)
                goto err_ioremap;

        for(i = BAR_1; i <= BAR_5; i++) {
                if(pci_resource_len(pdev, i) == 0)
                        continue;
                if(pci_resource_flags(pdev, i) & IORESOURCE_IO) {
                        adapter->hw.io_base = pci_resource_start(pdev, i);
                        break;
                }
        }

        netdev->open = &e1000_open;
        netdev->stop = &e1000_close;
        netdev->hard_start_xmit = &e1000_xmit_frame;
        netdev->get_stats = &e1000_get_stats;
        netdev->set_multicast_list = &e1000_set_multi;
        netdev->set_mac_address = &e1000_set_mac;
        netdev->change_mtu = &e1000_change_mtu;
        netdev->do_ioctl = &e1000_ioctl;
        netdev->tx_timeout = &e1000_tx_timeout;
        netdev->watchdog_timeo = HZ;
#ifdef CONFIG_E1000_NAPI
        netdev->poll = &e1000_poll;
        netdev->weight = 64;
#endif
        netdev->vlan_rx_register = e1000_vlan_rx_register;
        netdev->vlan_rx_add_vid = e1000_vlan_rx_add_vid;
        netdev->vlan_rx_kill_vid = e1000_vlan_rx_kill_vid;

        netdev->irq = pdev->irq;
        netdev->mem_start = mmio_start;
        netdev->base_addr = adapter->hw.io_base;

        adapter->bd_number = cards_found;
        adapter->id_string = e1000_strings[ent->driver_data];

        /* setup the private structure */

        e1000_sw_init(adapter);

        if(adapter->hw.mac_type >= e1000_82543) {
                netdev->features = NETIF_F_SG |
                                   NETIF_F_HW_CSUM |
                                   NETIF_F_HW_VLAN_TX |
                                   NETIF_F_HW_VLAN_RX |
                                   NETIF_F_HW_VLAN_FILTER;
        } else {
                netdev->features = NETIF_F_SG;
        }

#ifdef NETIF_F_TSO
        if(adapter->hw.mac_type >= e1000_82544)
                netdev->features |= NETIF_F_TSO;
#endif
 
        if(pci_using_dac)
                netdev->features |= NETIF_F_HIGHDMA;

        /* make sure the EEPROM is good */

        if(e1000_validate_eeprom_checksum(&adapter->hw) < 0) {
                printk(KERN_ERR "The EEPROM Checksum Is Not Valid\n");
                goto err_eeprom;
        }

        /* copy the MAC address out of the EEPROM */

        e1000_read_mac_addr(&adapter->hw);
        memcpy(netdev->dev_addr, adapter->hw.mac_addr, netdev->addr_len);

        if(!is_valid_ether_addr(netdev->dev_addr))
                goto err_eeprom;

        e1000_read_part_num(&adapter->hw, &(adapter->part_num));

        e1000_get_bus_info(&adapter->hw);

        if((adapter->hw.mac_type == e1000_82544) &&
           (adapter->hw.bus_type == e1000_bus_type_pcix))

                adapter->max_data_per_txd = 4096;
        else
                adapter->max_data_per_txd = MAX_JUMBO_FRAME_SIZE;


        init_timer(&adapter->watchdog_timer);
        adapter->watchdog_timer.function = &e1000_watchdog;
        adapter->watchdog_timer.data = (unsigned long) adapter;

        init_timer(&adapter->phy_info_timer);
        adapter->phy_info_timer.function = &e1000_update_phy_info;
        adapter->phy_info_timer.data = (unsigned long) adapter;

        INIT_TQUEUE(&adapter->tx_timeout_task, 
                (void (*)(void *))e1000_tx_timeout_task, netdev);

        register_netdev(netdev);

        /* we're going to reset, so assume we have no link for now */

        netif_carrier_off(netdev);
        netif_stop_queue(netdev);

        printk(KERN_INFO "%s: %s\n", netdev->name, adapter->id_string);
        e1000_check_options(adapter);
        e1000_proc_dev_setup(adapter);

        /* Initial Wake on LAN setting
         * If APM wake is enabled in the EEPROM,
         * enable the ACPI Magic Packet filter
         */

        if((adapter->hw.mac_type >= e1000_82544) &&
           (E1000_READ_REG(&adapter->hw, WUC) & E1000_WUC_APME))
                adapter->wol |= E1000_WUFC_MAG;

        /* reset the hardware with the new settings */

        e1000_reset(adapter);

        cards_found++;
        return 0;

err_eeprom:
        iounmap(adapter->hw.hw_addr);
err_ioremap:
        pci_release_regions(pdev);
        kfree(netdev);
err_alloc_etherdev:
        return -ENOMEM;
}

/**
 * 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.  The could be caused by a
 * Hot-Plug event, or because the driver is going to be removed from
 * memory.
 **/

static void __devexit
e1000_remove(struct pci_dev *pdev)
{
        struct net_device *netdev = pci_get_drvdata(pdev);
        struct e1000_adapter *adapter = netdev->priv;
        uint32_t manc;
        
        if(adapter->hw.mac_type >= e1000_82540) {
                manc = E1000_READ_REG(&adapter->hw, MANC);
                if(manc & E1000_MANC_SMBUS_EN) {
                        manc |= E1000_MANC_ARP_EN;
                        E1000_WRITE_REG(&adapter->hw, MANC, manc);
                }
        }
                
        unregister_netdev(netdev);

        e1000_phy_hw_reset(&adapter->hw);

        e1000_proc_dev_free(adapter);

        iounmap(adapter->hw.hw_addr);
        pci_release_regions(pdev);

        kfree(netdev);
}

/**
 * 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.
 * Fields are initialized based on PCI device information and
 * OS network device settings (MTU size).
 **/

static void __devinit
e1000_sw_init(struct e1000_adapter *adapter)
{
        struct e1000_hw *hw = &adapter->hw;
        struct net_device *netdev = adapter->netdev;
        struct pci_dev *pdev = adapter->pdev;

        /* PCI config space info */

        pci_read_config_word(pdev, PCI_VENDOR_ID, &hw->vendor_id);
        pci_read_config_word(pdev, PCI_DEVICE_ID, &hw->device_id);
        pci_read_config_word(pdev, PCI_SUBSYSTEM_VENDOR_ID, 
                             &hw->subsystem_vendor_id);
        pci_read_config_word(pdev, PCI_SUBSYSTEM_ID, &hw->subsystem_id);
        pci_read_config_byte(pdev, PCI_REVISION_ID, &hw->revision_id);
        pci_read_config_word(pdev, PCI_COMMAND, &hw->pci_cmd_word);

        adapter->rx_buffer_len = E1000_RXBUFFER_2048;
        hw->max_frame_size = 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)) {
                E1000_ERR("Unknown MAC Type\n");
                BUG();
        }

        /* flow control settings */

        hw->fc_high_water = FC_DEFAULT_HI_THRESH;
        hw->fc_low_water = FC_DEFAULT_LO_THRESH;
        hw->fc_pause_time = FC_DEFAULT_TX_TIMER;
        hw->fc_send_xon = 1;

        /* Media type - copper or fiber */

        if(hw->mac_type >= e1000_82543) {
                uint32_t status = E1000_READ_REG(hw, STATUS);

                if(status & E1000_STATUS_TBIMODE)
                        hw->media_type = e1000_media_type_fiber;
                else
                        hw->media_type = e1000_media_type_copper;
        } else {
                hw->media_type = e1000_media_type_fiber;
        }

        if(hw->mac_type < e1000_82543)
                hw->report_tx_early = 0;
        else
                hw->report_tx_early = 1;

        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;
        }

        atomic_set(&adapter->irq_sem, 1);
        spin_lock_init(&adapter->stats_lock);
}

/**
 * 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 timer is started,
 * and the stack is notified that the interface is ready.
 **/

static int
e1000_open(struct net_device *netdev)
{
        struct e1000_adapter *adapter = netdev->priv;

        /* allocate transmit descriptors */

        if(e1000_setup_tx_resources(adapter))
                goto err_setup_tx;

        /* allocate receive descriptors */

        if(e1000_setup_rx_resources(adapter))
                goto err_setup_rx;

        if(e1000_up(adapter))
                goto err_up;

        return 0;

err_up:
        e1000_free_rx_resources(adapter);
err_setup_rx:
        e1000_free_tx_resources(adapter);
err_setup_tx:
        e1000_reset(adapter);

        return -EBUSY;
}

/**
 * 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.
 **/

static int
e1000_close(struct net_device *netdev)
{
        struct e1000_adapter *adapter = netdev->priv;

        e1000_down(adapter);

        e1000_free_tx_resources(adapter);
        e1000_free_rx_resources(adapter);

        return 0;
}

/**
 * e1000_setup_tx_resources - allocate Tx resources (Descriptors)
 * @adapter: board private structure
 *
 * Return 0 on success, negative on failure
 **/

static int
e1000_setup_tx_resources(struct e1000_adapter *adapter)
{
        struct e1000_desc_ring *txdr = &adapter->tx_ring;
        struct pci_dev *pdev = adapter->pdev;
        int size;

        size = sizeof(struct e1000_buffer) * txdr->count;
        txdr->buffer_info = kmalloc(size, GFP_KERNEL);
        if(!txdr->buffer_info) {
                return -ENOMEM;
        }
        memset(txdr->buffer_info, 0, size);

        /* round up to nearest 4K */

        txdr->size = txdr->count * sizeof(struct e1000_tx_desc);
        E1000_ROUNDUP(txdr->size, 4096);

        txdr->desc = pci_alloc_consistent(pdev, txdr->size, &txdr->dma);
        if(!txdr->desc) {
                kfree(txdr->buffer_info);
                return -ENOMEM;
        }
        memset(txdr->desc, 0, txdr->size);

        txdr->next_to_use = 0;
        txdr->next_to_clean = 0;

        return 0;
}

/**
 * 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)
{
        uint64_t tdba = adapter->tx_ring.dma;
        uint32_t tdlen = adapter->tx_ring.count * sizeof(struct e1000_tx_desc);
        uint32_t tctl, tipg;

        E1000_WRITE_REG(&adapter->hw, TDBAL, (tdba & 0x00000000ffffffffULL));
        E1000_WRITE_REG(&adapter->hw, TDBAH, (tdba >> 32));

        E1000_WRITE_REG(&adapter->hw, TDLEN, tdlen);

        /* Setup the HW Tx Head and Tail descriptor pointers */

        E1000_WRITE_REG(&adapter->hw, TDH, 0);
        E1000_WRITE_REG(&adapter->hw, TDT, 0);

        /* Set the default values for the Tx Inter Packet Gap timer */

        switch (adapter->hw.mac_type) {
        case e1000_82542_rev2_0:
        case e1000_82542_rev2_1:
                tipg = DEFAULT_82542_TIPG_IPGT;
                tipg |= DEFAULT_82542_TIPG_IPGR1 << E1000_TIPG_IPGR1_SHIFT;
                tipg |= DEFAULT_82542_TIPG_IPGR2 << E1000_TIPG_IPGR2_SHIFT;
                break;
        default:
                if(adapter->hw.media_type == e1000_media_type_fiber)
                        tipg = DEFAULT_82543_TIPG_IPGT_FIBER;
                else
                        tipg = DEFAULT_82543_TIPG_IPGT_COPPER;
                tipg |= DEFAULT_82543_TIPG_IPGR1 << E1000_TIPG_IPGR1_SHIFT;
                tipg |= DEFAULT_82543_TIPG_IPGR2 << E1000_TIPG_IPGR2_SHIFT;
        }
        E1000_WRITE_REG(&adapter->hw, TIPG, tipg);

        /* Set the Tx Interrupt Delay register */

        E1000_WRITE_REG(&adapter->hw, TIDV, adapter->tx_int_delay);
        if(adapter->hw.mac_type >= e1000_82540)
                E1000_WRITE_REG(&adapter->hw, TADV, adapter->tx_abs_int_delay);

        /* Program the Transmit Control Register */

        tctl = E1000_READ_REG(&adapter->hw, TCTL);

        tctl &= ~E1000_TCTL_CT;
        tctl |= E1000_TCTL_EN | E1000_TCTL_PSP |
               (E1000_COLLISION_THRESHOLD << E1000_CT_SHIFT);

        E1000_WRITE_REG(&adapter->hw, TCTL, tctl);

        e1000_config_collision_dist(&adapter->hw);

        /* Setup Transmit Descriptor Settings for this adapter */
        adapter->txd_cmd = E1000_TXD_CMD_IFCS | E1000_TXD_CMD_IDE;

        if(adapter->hw.report_tx_early == 1)
                adapter->txd_cmd |= E1000_TXD_CMD_RS;
        else
                adapter->txd_cmd |= E1000_TXD_CMD_RPS;
}

/**
 * e1000_setup_rx_resources - allocate Rx resources (Descriptors)
 * @adapter: board private structure
 *
 * Returns 0 on success, negative on failure
 **/

static int
e1000_setup_rx_resources(struct e1000_adapter *adapter)
{
        struct e1000_desc_ring *rxdr = &adapter->rx_ring;
        struct pci_dev *pdev = adapter->pdev;
        int size;

        size = sizeof(struct e1000_buffer) * rxdr->count;
        rxdr->buffer_info = kmalloc(size, GFP_KERNEL);
        if(!rxdr->buffer_info) {
                return -ENOMEM;
        }
        memset(rxdr->buffer_info, 0, size);

        /* Round up to nearest 4K */

        rxdr->size = rxdr->count * sizeof(struct e1000_rx_desc);
        E1000_ROUNDUP(rxdr->size, 4096);

        rxdr->desc = pci_alloc_consistent(pdev, rxdr->size, &rxdr->dma);

        if(!rxdr->desc) {
                kfree(rxdr->buffer_info);
                return -ENOMEM;
        }
        memset(rxdr->desc, 0, rxdr->size);

        rxdr->next_to_clean = 0;
        rxdr->next_to_use = 0;

        return 0;
}

/**
 * e1000_setup_rctl - configure the receive control register
 * @adapter: Board private structure
 **/

static void
e1000_setup_rctl(struct e1000_adapter *adapter)
{
        uint32_t rctl;

        rctl = E1000_READ_REG(&adapter->hw, RCTL);

        rctl &= ~(3 << E1000_RCTL_MO_SHIFT);

        rctl |= E1000_RCTL_EN | E1000_RCTL_BAM |
                E1000_RCTL_LBM_NO | E1000_RCTL_RDMTS_HALF |
                (adapter->hw.mc_filter_type << E1000_RCTL_MO_SHIFT);

        if(adapter->hw.tbi_compatibility_on == 1)
                rctl |= E1000_RCTL_SBP;
        else
                rctl &= ~E1000_RCTL_SBP;

        rctl &= ~(E1000_RCTL_SZ_4096);
        switch (adapter->rx_buffer_len) {
        case E1000_RXBUFFER_2048:
        default:
                rctl |= E1000_RCTL_SZ_2048;
                rctl &= ~(E1000_RCTL_BSEX | E1000_RCTL_LPE);
                break;
        case E1000_RXBUFFER_4096:
                rctl |= E1000_RCTL_SZ_4096 | E1000_RCTL_BSEX | E1000_RCTL_LPE;
                break;
        case E1000_RXBUFFER_8192:
                rctl |= E1000_RCTL_SZ_8192 | E1000_RCTL_BSEX | E1000_RCTL_LPE;
                break;
        case E1000_RXBUFFER_16384:
                rctl |= E1000_RCTL_SZ_16384 | E1000_RCTL_BSEX | E1000_RCTL_LPE;
                break;
        }

        E1000_WRITE_REG(&adapter->hw, 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)
{
        uint64_t rdba = adapter->rx_ring.dma;
        uint32_t rdlen = adapter->rx_ring.count * sizeof(struct e1000_rx_desc);
        uint32_t rctl;
        uint32_t rxcsum;

        /* make sure receives are disabled while setting up the descriptors */

        rctl = E1000_READ_REG(&adapter->hw, RCTL);
        E1000_WRITE_REG(&adapter->hw, RCTL, rctl & ~E1000_RCTL_EN);

        /* set the Receive Delay Timer Register */

        if(adapter->hw.mac_type >= e1000_82540) {
                E1000_WRITE_REG(&adapter->hw, RDTR, adapter->rx_int_delay);
                E1000_WRITE_REG(&adapter->hw, RADV, adapter->rx_abs_int_delay);

                /* Set the interrupt throttling rate.  Value is calculated
                 * as DEFAULT_ITR = 1/(MAX_INTS_PER_SEC * 256ns) */
#define MAX_INTS_PER_SEC        8000
#define DEFAULT_ITR             1000000000/(MAX_INTS_PER_SEC * 256)
                E1000_WRITE_REG(&adapter->hw, ITR, DEFAULT_ITR);

        } else {
                E1000_WRITE_REG(&adapter->hw, RDTR, adapter->rx_int_delay);
        }

        /* Setup the Base and Length of the Rx Descriptor Ring */

        E1000_WRITE_REG(&adapter->hw, RDBAL, (rdba & 0x00000000ffffffffULL));
        E1000_WRITE_REG(&adapter->hw, RDBAH, (rdba >> 32));

        E1000_WRITE_REG(&adapter->hw, RDLEN, rdlen);

        /* Setup the HW Rx Head and Tail Descriptor Pointers */
        E1000_WRITE_REG(&adapter->hw, RDH, 0);
        E1000_WRITE_REG(&adapter->hw, RDT, 0);

        /* Enable 82543 Receive Checksum Offload for TCP and UDP */
        if((adapter->hw.mac_type >= e1000_82543) &&
           (adapter->rx_csum == TRUE)) {
                rxcsum = E1000_READ_REG(&adapter->hw, RXCSUM);
                rxcsum |= E1000_RXCSUM_TUOFL;
                E1000_WRITE_REG(&adapter->hw, RXCSUM, rxcsum);
        }

        /* Enable Receives */

        E1000_WRITE_REG(&adapter->hw, RCTL, rctl);
}

/**
 * e1000_free_tx_resources - Free Tx Resources
 * @adapter: board private structure
 *
 * Free all transmit software resources
 **/

static void
e1000_free_tx_resources(struct e1000_adapter *adapter)
{
        struct pci_dev *pdev = adapter->pdev;

        e1000_clean_tx_ring(adapter);

        kfree(adapter->tx_ring.buffer_info);
        adapter->tx_ring.buffer_info = NULL;

        pci_free_consistent(pdev, adapter->tx_ring.size,
                            adapter->tx_ring.desc, adapter->tx_ring.dma);

        adapter->tx_ring.desc = NULL;
}

/**
 * e1000_clean_tx_ring - Free Tx Buffers
 * @adapter: board private structure
 **/

static void
e1000_clean_tx_ring(struct e1000_adapter *adapter)
{
        struct pci_dev *pdev = adapter->pdev;
        unsigned long size;
        int i;

        /* Free all the Tx ring sk_buffs */

        for(i = 0; i < adapter->tx_ring.count; i++) {
                if(adapter->tx_ring.buffer_info[i].skb) {

                        pci_unmap_page(pdev,
                                       adapter->tx_ring.buffer_info[i].dma,
                                       adapter->tx_ring.buffer_info[i].length,
                                       PCI_DMA_TODEVICE);

                        dev_kfree_skb(adapter->tx_ring.buffer_info[i].skb);

                        adapter->tx_ring.buffer_info[i].skb = NULL;
                }
        }

        size = sizeof(struct e1000_buffer) * adapter->tx_ring.count;
        memset(adapter->tx_ring.buffer_info, 0, size);

        /* Zero out the descriptor ring */

        memset(adapter->tx_ring.desc, 0, adapter->tx_ring.size);

        adapter->tx_ring.next_to_use = 0;
        adapter->tx_ring.next_to_clean = 0;

        E1000_WRITE_REG(&adapter->hw, TDH, 0);
        E1000_WRITE_REG(&adapter->hw, TDT, 0);
}

/**
 * e1000_free_rx_resources - Free Rx Resources
 * @adapter: board private structure
 *
 * Free all receive software resources
 **/

static void
e1000_free_rx_resources(struct e1000_adapter *adapter)
{
        struct pci_dev *pdev = adapter->pdev;

        e1000_clean_rx_ring(adapter);

        kfree(adapter->rx_ring.buffer_info);
        adapter->rx_ring.buffer_info = NULL;

        pci_free_consistent(pdev, adapter->rx_ring.size,
                            adapter->rx_ring.desc, adapter->rx_ring.dma);

        adapter->rx_ring.desc = NULL;
}

/**
 * e1000_clean_rx_ring - Free Rx Buffers
 * @adapter: board private structure
 **/

static void
e1000_clean_rx_ring(struct e1000_adapter *adapter)
{
        struct pci_dev *pdev = adapter->pdev;
        unsigned long size;
        int i;

        /* Free all the Rx ring sk_buffs */

        for(i = 0; i < adapter->rx_ring.count; i++) {
                if(adapter->rx_ring.buffer_info[i].skb) {

                        pci_unmap_single(pdev,
                                         adapter->rx_ring.buffer_info[i].dma,
                                         adapter->rx_ring.buffer_info[i].length,
                                         PCI_DMA_FROMDEVICE);

                        dev_kfree_skb(adapter->rx_ring.buffer_info[i].skb);

                        adapter->rx_ring.buffer_info[i].skb = NULL;
                }
        }

        size = sizeof(struct e1000_buffer) * adapter->rx_ring.count;
        memset(adapter->rx_ring.buffer_info, 0, size);

        /* Zero out the descriptor ring */

        memset(adapter->rx_ring.desc, 0, adapter->rx_ring.size);

        adapter->rx_ring.next_to_clean = 0;
        adapter->rx_ring.next_to_use = 0;

        E1000_WRITE_REG(&adapter->hw, RDH, 0);
        E1000_WRITE_REG(&adapter->hw, RDT, 0);
}

/* 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 net_device *netdev = adapter->netdev;
        uint32_t rctl;

        e1000_pci_clear_mwi(&adapter->hw);

        rctl = E1000_READ_REG(&adapter->hw, RCTL);
        rctl |= E1000_RCTL_RST;
        E1000_WRITE_REG(&adapter->hw, RCTL, rctl);
        E1000_WRITE_FLUSH(&adapter->hw);
        mdelay(5);

        if(netif_running(netdev))
                e1000_clean_rx_ring(adapter);
}

static void
e1000_leave_82542_rst(struct e1000_adapter *adapter)
{
        struct net_device *netdev = adapter->netdev;
        uint32_t rctl;

        rctl = E1000_READ_REG(&adapter->hw, RCTL);
        rctl &= ~E1000_RCTL_RST;
        E1000_WRITE_REG(&adapter->hw, RCTL, rctl);
        E1000_WRITE_FLUSH(&adapter->hw);
        mdelay(5);

        if(adapter->hw.pci_cmd_word & PCI_COMMAND_INVALIDATE)
                e1000_pci_set_mwi(&adapter->hw);

        if(netif_running(netdev)) {
                e1000_configure_rx(adapter);
                e1000_alloc_rx_buffers(adapter);
        }
}

/**
 * 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;
        struct sockaddr *addr = p;

        /* 82542 2.0 needs to be in reset to write receive address registers */

        if(adapter->hw.mac_type == e1000_82542_rev2_0)
                e1000_enter_82542_rst(adapter);

        memcpy(netdev->dev_addr, addr->sa_data, netdev->addr_len);
        memcpy(adapter->hw.mac_addr, addr->sa_data, netdev->addr_len);

        e1000_rar_set(&adapter->hw, adapter->hw.mac_addr, 0);

        if(adapter->hw.mac_type == e1000_82542_rev2_0)
                e1000_leave_82542_rst(adapter);

        return 0;
}

/**
 * e1000_set_multi - Multicast and Promiscuous mode set
 * @netdev: network interface device structure
 *
 * The set_multi entry point is called whenever the multicast address
 * list or the network interface flags are updated.  This routine is
 * resposible for configuring the hardware for proper multicast,
 * promiscuous mode, and all-multi behavior.
 **/

static void
e1000_set_multi(struct net_device *netdev)
{
        struct e1000_adapter *adapter = netdev->priv;
        struct e1000_hw *hw = &adapter->hw;
        struct dev_mc_list *mc_ptr;
        uint32_t rctl;
        uint32_t hash_value;
        int i;

        /* Check for Promiscuous and All Multicast modes */

        rctl = E1000_READ_REG(hw, RCTL);

        if(netdev->flags & IFF_PROMISC) {
                rctl |= (E1000_RCTL_UPE | E1000_RCTL_MPE);
        } else if(netdev->flags & IFF_ALLMULTI) {
                rctl |= E1000_RCTL_MPE;
                rctl &= ~E1000_RCTL_UPE;
        } else {
                rctl &= ~(E1000_RCTL_UPE | E1000_RCTL_MPE);
        }

        E1000_WRITE_REG(hw, 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 15 multicast address into the exact filters 1-15
         * RAR 0 is used for the station MAC adddress
         * if there are not 15 addresses, go ahead and clear the filters
         */
        mc_ptr = netdev->mc_list;

        for(i = 1; i < E1000_RAR_ENTRIES; i++) {
                if(mc_ptr) {
                        e1000_rar_set(hw, mc_ptr->dmi_addr, i);
                        mc_ptr = mc_ptr->next;
                } else {
                        E1000_WRITE_REG_ARRAY(hw, RA, i << 1, 0);
                        E1000_WRITE_REG_ARRAY(hw, RA, (i << 1) + 1, 0);
                }
        }

        /* clear the old settings from the multicast hash table */

        for(i = 0; i < E1000_NUM_MTA_REGISTERS; i++)
                E1000_WRITE_REG_ARRAY(hw, MTA, i, 0);

        /* load any remaining addresses into the hash table */

        for(; mc_ptr; mc_ptr = mc_ptr->next) {
                hash_value = e1000_hash_mc_addr(hw, mc_ptr->dmi_addr);
                e1000_mta_set(hw, hash_value);
        }

        if(hw->mac_type == e1000_82542_rev2_0)
                e1000_leave_82542_rst(adapter);
}


/* need to wait a few seconds after link up to get diagnostic information from the phy */

static void
e1000_update_phy_info(unsigned long data)
{
        struct e1000_adapter *adapter = (struct e1000_adapter *) data;
        e1000_phy_get_info(&adapter->hw, &adapter->phy_info);
}

/**
 * e1000_watchdog - Timer Call-back
 * @data: pointer to netdev cast into an unsigned long
 **/

static void
e1000_watchdog(unsigned long data)
{
        struct e1000_adapter *adapter = (struct e1000_adapter *) data;
        struct net_device *netdev = adapter->netdev;
        struct e1000_desc_ring *txdr = &adapter->tx_ring;
        int i;

        e1000_check_for_link(&adapter->hw);

        if(E1000_READ_REG(&adapter->hw, STATUS) & E1000_STATUS_LU) {
                if(!netif_carrier_ok(netdev)) {
                        e1000_get_speed_and_duplex(&adapter->hw,
                                                   &adapter->link_speed,
                                                   &adapter->link_duplex);

                        printk(KERN_INFO
                               "e1000: %s NIC Link is Up %d Mbps %s\n",
                               netdev->name, adapter->link_speed,
                               adapter->link_duplex == FULL_DUPLEX ?
                               "Full Duplex" : "Half Duplex");

                        netif_carrier_on(netdev);
                        netif_wake_queue(netdev);
                        mod_timer(&adapter->phy_info_timer, jiffies + 2 * HZ);
                }
        } else {
                if(netif_carrier_ok(netdev)) {
                        adapter->link_speed = 0;
                        adapter->link_duplex = 0;
                        printk(KERN_INFO
                               "e1000: %s NIC Link is Down\n",
                               netdev->name);
                        netif_carrier_off(netdev);
                        netif_stop_queue(netdev);
                        mod_timer(&adapter->phy_info_timer, jiffies + 2 * HZ);
                }
        }

        e1000_update_stats(adapter);
        e1000_update_adaptive(&adapter->hw);

        /* Early detection of hung controller */
        i = txdr->next_to_clean;
        if(txdr->buffer_info[i].dma &&
           time_after(jiffies, txdr->buffer_info[i].time_stamp + HZ) &&
           !(E1000_READ_REG(&adapter->hw, STATUS) & E1000_STATUS_TXOFF))
                netif_stop_queue(netdev);

        /* Reset the timer */
        mod_timer(&adapter->watchdog_timer, jiffies + 2 * HZ);
}

#define E1000_TX_FLAGS_CSUM             0x00000001
#define E1000_TX_FLAGS_VLAN             0x00000002
#define E1000_TX_FLAGS_TSO              0x00000004
#define E1000_TX_FLAGS_VLAN_MASK        0xffff0000
#define E1000_TX_FLAGS_VLAN_SHIFT       16

static inline boolean_t
e1000_tso(struct e1000_adapter *adapter, struct sk_buff *skb, int tx_flags)
{
#ifdef NETIF_F_TSO
        struct e1000_context_desc *context_desc;
        int i;
        uint8_t ipcss, ipcso, tucss, tucso, hdr_len;
        uint16_t ipcse, tucse, mss;
        
        if(skb_shinfo(skb)->tso_size) {
                hdr_len = ((skb->h.raw - skb->data) + (skb->h.th->doff << 2));
                mss = skb_shinfo(skb)->tso_size;
                skb->nh.iph->tot_len = 0;
                skb->nh.iph->check = 0;
                skb->h.th->check = ~csum_tcpudp_magic(skb->nh.iph->saddr,
                                                      skb->nh.iph->daddr,
                                                      0,
                                                      IPPROTO_TCP,
                                                      0);
                ipcss = skb->nh.raw - skb->data;
                ipcso = (void *)&(skb->nh.iph->check) - (void *)skb->data;
                ipcse = skb->h.raw - skb->data - 1;
                tucss = skb->h.raw - skb->data;
                tucso = (void *)&(skb->h.th->check) - (void *)skb->data;
                tucse = 0;

                i = adapter->tx_ring.next_to_use;
                context_desc = E1000_CONTEXT_DESC(adapter->tx_ring, 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(adapter->txd_cmd |
                        E1000_TXD_CMD_DEXT | E1000_TXD_CMD_TSE |
                        E1000_TXD_CMD_IP | E1000_TXD_CMD_TCP |
                        (skb->len - (hdr_len)));

                i = (i + 1) % adapter->tx_ring.count;
                adapter->tx_ring.next_to_use = i;

                return TRUE;
        }
#endif
        
        return FALSE;
}

static inline boolean_t
e1000_tx_csum(struct e1000_adapter *adapter, struct sk_buff *skb)
{
        struct e1000_context_desc *context_desc;
        int i;
        uint8_t css, cso;

        if(skb->ip_summed == CHECKSUM_HW) {
                css = skb->h.raw - skb->data;
                cso = (skb->h.raw + skb->csum) - skb->data;

                i = adapter->tx_ring.next_to_use;
                context_desc = E1000_CONTEXT_DESC(adapter->tx_ring, i);

                context_desc->upper_setup.tcp_fields.tucss = css;
                context_desc->upper_setup.tcp_fields.tucso = cso;
                context_desc->upper_setup.tcp_fields.tucse = 0;
                context_desc->tcp_seg_setup.data = 0;
                context_desc->cmd_and_length =
                        cpu_to_le32(adapter->txd_cmd | E1000_TXD_CMD_DEXT);

                i = (i + 1) % adapter->tx_ring.count;
                adapter->tx_ring.next_to_use = i;

                return TRUE;
        }

        return FALSE;
}

static inline int
e1000_tx_map(struct e1000_adapter *adapter, struct sk_buff *skb)
{
        struct e1000_desc_ring *tx_ring = &adapter->tx_ring;
        int len, offset, size, count, i;

        int f;
        len = skb->len - skb->data_len;

        i = (tx_ring->next_to_use + tx_ring->count - 1) % tx_ring->count;
        count = 0;

        offset = 0;

        while(len) {
                i = (i + 1) % tx_ring->count;
                size = min(len, adapter->max_data_per_txd);
                tx_ring->buffer_info[i].length = size;
                tx_ring->buffer_info[i].dma =
                        pci_map_single(adapter->pdev,
                                skb->data + offset,
                                size,
                                PCI_DMA_TODEVICE);
                tx_ring->buffer_info[i].time_stamp = jiffies;

                len -= size;
                offset += size;
                count++;
        }

        for(f = 0; f < skb_shinfo(skb)->nr_frags; f++) {
                struct skb_frag_struct *frag;

                frag = &skb_shinfo(skb)->frags[f];
                len = frag->size;
                offset = 0;

                while(len) {
                        i = (i + 1) % tx_ring->count;
                        size = min(len, adapter->max_data_per_txd);
                        tx_ring->buffer_info[i].length = size;
                        tx_ring->buffer_info[i].dma =
                                pci_map_page(adapter->pdev,
                                        frag->page,
                                        frag->page_offset + offset,
                                        size,
                                        PCI_DMA_TODEVICE);

                        len -= size;
                        offset += size;
                        count++;
                }
        }
        tx_ring->buffer_info[i].skb = skb;

        return count;
}

static inline void
e1000_tx_queue(struct e1000_adapter *adapter, int count, int tx_flags)
{
        struct e1000_desc_ring *tx_ring = &adapter->tx_ring;
        struct e1000_tx_desc *tx_desc = NULL;
        uint32_t txd_upper, txd_lower;
        int i;

        txd_upper = 0;
        txd_lower = adapter->txd_cmd;

        if(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_IXSM | E1000_TXD_POPTS_TXSM) << 8;
        }

        if(tx_flags & E1000_TX_FLAGS_CSUM) {
                txd_lower |= E1000_TXD_CMD_DEXT | E1000_TXD_DTYP_D;
                txd_upper |= E1000_TXD_POPTS_TXSM << 8;
        }

        if(tx_flags & E1000_TX_FLAGS_VLAN) {
                txd_lower |= E1000_TXD_CMD_VLE;
                txd_upper |= (tx_flags & E1000_TX_FLAGS_VLAN_MASK);
        }

        i = tx_ring->next_to_use;

        while(count--) {
                tx_desc = E1000_TX_DESC(*tx_ring, i);
                tx_desc->buffer_addr = cpu_to_le64(tx_ring->buffer_info[i].dma);
                tx_desc->lower.data =
                        cpu_to_le32(txd_lower | tx_ring->buffer_info[i].length);
                tx_desc->upper.data = cpu_to_le32(txd_upper);
                i = (i + 1) % tx_ring->count;
        }

        tx_desc->lower.data |= cpu_to_le32(E1000_TXD_CMD_EOP);

        /* Force memory writes to complete before letting h/w
         * know there are new descriptors to fetch.  (Only
         * applicable for weak-ordered memory model archs,
         * such as IA-64). */
        wmb();

        tx_ring->next_to_use = i;
        E1000_WRITE_REG(&adapter->hw, TDT, i);
}

#define TXD_USE_COUNT(S, X) (((S) / (X)) + (((S) % (X)) ? 1 : 0))

static int
e1000_xmit_frame(struct sk_buff *skb, struct net_device *netdev)
{
        struct e1000_adapter *adapter = netdev->priv;
        int tx_flags = 0, count;

        int f;


        count = TXD_USE_COUNT(skb->len - skb->data_len,
                              adapter->max_data_per_txd);
        for(f = 0; f < skb_shinfo(skb)->nr_frags; f++)
                count += TXD_USE_COUNT(skb_shinfo(skb)->frags[f].size,
                                       adapter->max_data_per_txd);
#ifdef NETIF_F_TSO
        if((skb_shinfo(skb)->tso_size) || (skb->ip_summed == CHECKSUM_HW))
                count++;
#else
        if(skb->ip_summed == CHECKSUM_HW)
                count++;
#endif

        if(E1000_DESC_UNUSED(&adapter->tx_ring) < count) {
                netif_stop_queue(netdev);
                return 1;
        }

        if(adapter->vlgrp && vlan_tx_tag_present(skb)) {
                tx_flags |= E1000_TX_FLAGS_VLAN;
                tx_flags |= (vlan_tx_tag_get(skb) << E1000_TX_FLAGS_VLAN_SHIFT);
        }

        if(e1000_tso(adapter, skb, tx_flags))
                tx_flags |= E1000_TX_FLAGS_TSO;
        else if(e1000_tx_csum(adapter, skb))
                tx_flags |= E1000_TX_FLAGS_CSUM;

        count = e1000_tx_map(adapter, skb);

        e1000_tx_queue(adapter, count, tx_flags);

        netdev->trans_start = jiffies;

        return 0;
}

/**
 * e1000_tx_timeout - Respond to a Tx Hang
 * @netdev: network interface device structure
 **/

static void
e1000_tx_timeout(struct net_device *netdev)
{
        struct e1000_adapter *adapter = netdev->priv;

        /* Do the reset outside of interrupt context */
        schedule_task(&adapter->tx_timeout_task);
}

static void
e1000_tx_timeout_task(struct net_device *netdev)
{
        struct e1000_adapter *adapter = netdev->priv;

        netif_device_detach(netdev);
        e1000_down(adapter);
        e1000_up(adapter);
        netif_device_attach(netdev);
}

/**
 * e1000_get_stats - Get System Network Statistics
 * @netdev: network interface device structure
 *
 * Returns the address of the device statistics structure.
 * The statistics are actually updated from the timer callback.
 **/

static struct net_device_stats *
e1000_get_stats(struct net_device *netdev)
{
        struct e1000_adapter *adapter = netdev->priv;

        return &adapter->net_stats;
}

/**
 * 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;
        int old_mtu = adapter->rx_buffer_len;
        int max_frame = new_mtu + ENET_HEADER_SIZE + ETHERNET_FCS_SIZE;

        if((max_frame < MINIMUM_ETHERNET_FRAME_SIZE) ||
           (max_frame > MAX_JUMBO_FRAME_SIZE)) {
                E1000_ERR("Invalid MTU setting\n");
                return -EINVAL;
        }

        if(max_frame <= MAXIMUM_ETHERNET_FRAME_SIZE) {
                adapter->rx_buffer_len = E1000_RXBUFFER_2048;

        } else if(adapter->hw.mac_type < e1000_82543) {
                E1000_ERR("Jumbo Frames not supported on 82542\n");
                return -EINVAL;

        } else if(max_frame <= E1000_RXBUFFER_4096) {
                adapter->rx_buffer_len = E1000_RXBUFFER_4096;

        } else if(max_frame <= E1000_RXBUFFER_8192) {
                adapter->rx_buffer_len = E1000_RXBUFFER_8192;

        } else {
                adapter->rx_buffer_len = E1000_RXBUFFER_16384;
        }

        if(old_mtu != adapter->rx_buffer_len && netif_running(netdev)) {

                e1000_down(adapter);
                e1000_up(adapter);
        }

        netdev->mtu = new_mtu;
        adapter->hw.max_frame_size = max_frame;

        return 0;
}

/**
 * e1000_update_stats - Update the board statistics counters
 * @adapter: board private structure
 **/

static void
e1000_update_stats(struct e1000_adapter *adapter)
{
        struct e1000_hw *hw = &adapter->hw;
        unsigned long flags;
        uint16_t phy_tmp;

#define PHY_IDLE_ERROR_COUNT_MASK 0x00FF

        spin_lock_irqsave(&adapter->stats_lock, flags);

        /* these counters are modified from e1000_adjust_tbi_stats,
         * called from the interrupt context, so they must only
         * be written while holding adapter->stats_lock
         */

        adapter->stats.crcerrs += E1000_READ_REG(hw, CRCERRS);
        adapter->stats.gprc += E1000_READ_REG(hw, GPRC);
        adapter->stats.gorcl += E1000_READ_REG(hw, GORCL);
        adapter->stats.gorch += E1000_READ_REG(hw, GORCH);
        adapter->stats.bprc += E1000_READ_REG(hw, BPRC);
        adapter->stats.mprc += E1000_READ_REG(hw, MPRC);
        adapter->stats.roc += E1000_READ_REG(hw, ROC);
        adapter->stats.prc64 += E1000_READ_REG(hw, PRC64);
        adapter->stats.prc127 += E1000_READ_REG(hw, PRC127);
        adapter->stats.prc255 += E1000_READ_REG(hw, PRC255);
        adapter->stats.prc511 += E1000_READ_REG(hw, PRC511);
        adapter->stats.prc1023 += E1000_READ_REG(hw, PRC1023);
        adapter->stats.prc1522 += E1000_READ_REG(hw, PRC1522);

        spin_unlock_irqrestore(&adapter->stats_lock, flags);

        /* the rest of the counters are only modified here */

        adapter->stats.symerrs += E1000_READ_REG(hw, SYMERRS);
        adapter->stats.mpc += E1000_READ_REG(hw, MPC);
        adapter->stats.scc += E1000_READ_REG(hw, SCC);
        adapter->stats.ecol += E1000_READ_REG(hw, ECOL);
        adapter->stats.mcc += E1000_READ_REG(hw, MCC);
        adapter->stats.latecol += E1000_READ_REG(hw, LATECOL);
        adapter->stats.dc += E1000_READ_REG(hw, DC);
        adapter->stats.sec += E1000_READ_REG(hw, SEC);
        adapter->stats.rlec += E1000_READ_REG(hw, RLEC);
        adapter->stats.xonrxc += E1000_READ_REG(hw, XONRXC);
        adapter->stats.xontxc += E1000_READ_REG(hw, XONTXC);
        adapter->stats.xoffrxc += E1000_READ_REG(hw, XOFFRXC);
        adapter->stats.xofftxc += E1000_READ_REG(hw, XOFFTXC);
        adapter->stats.fcruc += E1000_READ_REG(hw, FCRUC);
        adapter->stats.gptc += E1000_READ_REG(hw, GPTC);
        adapter->stats.gotcl += E1000_READ_REG(hw, GOTCL);
        adapter->stats.gotch += E1000_READ_REG(hw, GOTCH);
        adapter->stats.rnbc += E1000_READ_REG(hw, RNBC);
        adapter->stats.ruc += E1000_READ_REG(hw, RUC);
        adapter->stats.rfc += E1000_READ_REG(hw, RFC);
        adapter->stats.rjc += E1000_READ_REG(hw, RJC);
        adapter->stats.torl += E1000_READ_REG(hw, TORL);
        adapter->stats.torh += E1000_READ_REG(hw, TORH);
        adapter->stats.totl += E1000_READ_REG(hw, TOTL);
        adapter->stats.toth += E1000_READ_REG(hw, TOTH);
        adapter->stats.tpr += E1000_READ_REG(hw, TPR);
        adapter->stats.ptc64 += E1000_READ_REG(hw, PTC64);
        adapter->stats.ptc127 += E1000_READ_REG(hw, PTC127);
        adapter->stats.ptc255 += E1000_READ_REG(hw, PTC255);
        adapter->stats.ptc511 += E1000_READ_REG(hw, PTC511);
        adapter->stats.ptc1023 += E1000_READ_REG(hw, PTC1023);
        adapter->stats.ptc1522 += E1000_READ_REG(hw, PTC1522);
        adapter->stats.mptc += E1000_READ_REG(hw, MPTC);
        adapter->stats.bptc += E1000_READ_REG(hw, BPTC);

        /* used for adaptive IFS */

        hw->tx_packet_delta = E1000_READ_REG(hw, TPT);
        adapter->stats.tpt += hw->tx_packet_delta;
        hw->collision_delta = E1000_READ_REG(hw, COLC);
        adapter->stats.colc += hw->collision_delta;

        if(hw->mac_type >= e1000_82543) {
                adapter->stats.algnerrc += E1000_READ_REG(hw, ALGNERRC);
                adapter->stats.rxerrc += E1000_READ_REG(hw, RXERRC);
                adapter->stats.tncrs += E1000_READ_REG(hw, TNCRS);
                adapter->stats.cexterr += E1000_READ_REG(hw, CEXTERR);
                adapter->stats.tsctc += E1000_READ_REG(hw, TSCTC);
                adapter->stats.tsctfc += E1000_READ_REG(hw, TSCTFC);
        }

        /* Fill out the OS statistics structure */

        adapter->net_stats.rx_packets = adapter->stats.gprc;
        adapter->net_stats.tx_packets = adapter->stats.gptc;
        adapter->net_stats.rx_bytes = adapter->stats.gorcl;
        adapter->net_stats.tx_bytes = adapter->stats.gotcl;
        adapter->net_stats.multicast = adapter->stats.mprc;
        adapter->net_stats.collisions = adapter->stats.colc;

        /* Rx Errors */

        adapter->net_stats.rx_errors = adapter->stats.rxerrc +
                adapter->stats.crcerrs + adapter->stats.algnerrc +
                adapter->stats.rlec + adapter->stats.rnbc +
                adapter->stats.mpc + adapter->stats.cexterr;
        adapter->net_stats.rx_dropped = adapter->stats.rnbc;
        adapter->net_stats.rx_length_errors = adapter->stats.rlec;
        adapter->net_stats.rx_crc_errors = adapter->stats.crcerrs;
        adapter->net_stats.rx_frame_errors = adapter->stats.algnerrc;
        adapter->net_stats.rx_fifo_errors = adapter->stats.mpc;
        adapter->net_stats.rx_missed_errors = adapter->stats.mpc;

        /* Tx Errors */

        adapter->net_stats.tx_errors = adapter->stats.ecol +
                                       adapter->stats.latecol;
        adapter->net_stats.tx_aborted_errors = adapter->stats.ecol;
        adapter->net_stats.tx_window_errors = adapter->stats.latecol;

        /* 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(!e1000_read_phy_reg(hw, M88E1000_RX_ERR_CNTR, &phy_tmp))
                        adapter->phy_stats.receive_errors += phy_tmp;
        }
}

/**
 * e1000_irq_disable - Mask off interrupt generation on the NIC
 * @adapter: board private structure
 **/

static inline void
e1000_irq_disable(struct e1000_adapter *adapter)
{
        atomic_inc(&adapter->irq_sem);
        E1000_WRITE_REG(&adapter->hw, IMC, ~0);
        E1000_WRITE_FLUSH(&adapter->hw);
        synchronize_irq(adapter->netdev->irq);
}

/**
 * e1000_irq_enable - Enable default interrupt generation settings
 * @adapter: board private structure
 **/

static inline void
e1000_irq_enable(struct e1000_adapter *adapter)
{
        if(atomic_dec_and_test(&adapter->irq_sem)) {
                E1000_WRITE_REG(&adapter->hw, IMS, IMS_ENABLE_MASK);
                E1000_WRITE_FLUSH(&adapter->hw);
        }
}

/**
 * e1000_intr - Interrupt Handler
 * @irq: interrupt number
 * @data: pointer to a network interface device structure
 * @pt_regs: CPU registers structure
 **/

static void
e1000_intr(int irq, void *data, struct pt_regs *regs)
{
        struct net_device *netdev = data;
        struct e1000_adapter *adapter = netdev->priv;
        
#ifdef CONFIG_E1000_NAPI
        if (netif_rx_schedule_prep(netdev)) {
                e1000_irq_disable(adapter);
                __netif_rx_schedule(netdev);
        }
#else
        uint32_t icr;
        int i = E1000_MAX_INTR;

        while(i && (icr = E1000_READ_REG(&adapter->hw, ICR))) {

                if(icr & (E1000_ICR_RXSEQ | E1000_ICR_LSC)) {
                        adapter->hw.get_link_status = 1;
                        mod_timer(&adapter->watchdog_timer, jiffies);
                }

                e1000_clean_rx_irq(adapter);
                e1000_clean_tx_irq(adapter);
                i--;

        }
#endif
}

#ifdef CONFIG_E1000_NAPI
static int
e1000_process_intr(struct net_device *netdev)
{
        struct e1000_adapter *adapter = netdev->priv;
        uint32_t icr;
        int i = E1000_MAX_INTR;
        int hasReceived = 0;

        while(i && (icr = E1000_READ_REG(&adapter->hw, ICR))) {
                if (icr & E1000_ICR_RXT0)
                        hasReceived = 1;
 
                if (!(icr & ~(E1000_ICR_RXT0)))
                        break;
    
                if (icr & (E1000_ICR_RXSEQ | E1000_ICR_LSC)) {
                        adapter->hw.get_link_status = 1;
                        mod_timer(&adapter->watchdog_timer, jiffies);
                }
 
                e1000_clean_tx_irq(adapter);
                i--;
        }

        return hasReceived;
}
#endif

/**
 * e1000_clean_tx_irq - Reclaim resources after transmit completes
 * @adapter: board private structure
 **/

static void
e1000_clean_tx_irq(struct e1000_adapter *adapter)
{
        struct e1000_desc_ring *tx_ring = &adapter->tx_ring;
        struct net_device *netdev = adapter->netdev;
        struct pci_dev *pdev = adapter->pdev;
        struct e1000_tx_desc *tx_desc;
        int i;

        i = tx_ring->next_to_clean;
        tx_desc = E1000_TX_DESC(*tx_ring, i);

        while(tx_desc->upper.data & cpu_to_le32(E1000_TXD_STAT_DD)) {

                if(tx_ring->buffer_info[i].dma) {

                        pci_unmap_page(pdev,
                                       tx_ring->buffer_info[i].dma,
                                       tx_ring->buffer_info[i].length,
                                       PCI_DMA_TODEVICE);

                        tx_ring->buffer_info[i].dma = 0;
                }

                if(tx_ring->buffer_info[i].skb) {

                        dev_kfree_skb_any(tx_ring->buffer_info[i].skb);

                        tx_ring->buffer_info[i].skb = NULL;
                }

                tx_desc->upper.data = 0;

                i = (i + 1) % tx_ring->count;
                tx_desc = E1000_TX_DESC(*tx_ring, i);
        }

        tx_ring->next_to_clean = i;

        if(netif_queue_stopped(netdev) && netif_carrier_ok(netdev) &&
           (E1000_DESC_UNUSED(tx_ring) > E1000_TX_QUEUE_WAKE)) {

                netif_wake_queue(netdev);
        }
}

#ifdef CONFIG_E1000_NAPI
static int
e1000_poll(struct net_device *netdev, int *budget)
{
        struct e1000_adapter *adapter = netdev->priv;
        struct e1000_desc_ring *rx_ring = &adapter->rx_ring;
        struct pci_dev *pdev = adapter->pdev;
        struct e1000_rx_desc *rx_desc;
        struct sk_buff *skb;
        unsigned long flags;
        uint32_t length;
        uint8_t last_byte;
        int i;
        int received = 0;
        int rx_work_limit = *budget;

        if(rx_work_limit > netdev->quota)
                rx_work_limit = netdev->quota;

        e1000_process_intr(netdev);

        i = rx_ring->next_to_clean;
        rx_desc = E1000_RX_DESC(*rx_ring, i);

        while(rx_desc->status & E1000_RXD_STAT_DD) {
                if(--rx_work_limit < 0)
                        goto not_done;

                pci_unmap_single(pdev,
                                 rx_ring->buffer_info[i].dma,
                                 rx_ring->buffer_info[i].length,
                                 PCI_DMA_FROMDEVICE);

                skb = rx_ring->buffer_info[i].skb;
                length = le16_to_cpu(rx_desc->length);

                if(!(rx_desc->status & E1000_RXD_STAT_EOP)) {

                        /* All receives must fit into a single buffer */

                        E1000_DBG("Receive packet consumed multiple buffers\n");

                        dev_kfree_skb_irq(skb);
                        rx_desc->status = 0;
                        rx_ring->buffer_info[i].skb = NULL;

                        i = (i + 1) % rx_ring->count;

                        rx_desc = E1000_RX_DESC(*rx_ring, i);
                        continue;
                }

                if(rx_desc->errors & E1000_RXD_ERR_FRAME_ERR_MASK) {

                        last_byte = *(skb->data + length - 1);

                        if(TBI_ACCEPT(&adapter->hw, rx_desc->status,
                                      rx_desc->errors, length, last_byte)) {

                                spin_lock_irqsave(&adapter->stats_lock, flags);

                                e1000_tbi_adjust_stats(&adapter->hw,
                                                       &adapter->stats,
                                                       length, skb->data);

                                spin_unlock_irqrestore(&adapter->stats_lock,
                                                       flags);
                                length--;
                        } else {

                                dev_kfree_skb_irq(skb);
                                rx_desc->status = 0;
                                rx_ring->buffer_info[i].skb = NULL;

                                i = (i + 1) % rx_ring->count;

                                rx_desc = E1000_RX_DESC(*rx_ring, i);
                                continue;
                        }
                }

                /* Good Receive */
                skb_put(skb, length - ETHERNET_FCS_SIZE);

                /* Receive Checksum Offload */
                e1000_rx_checksum(adapter, rx_desc, skb);

                skb->protocol = eth_type_trans(skb, netdev);
                if(adapter->vlgrp && (rx_desc->status & E1000_RXD_STAT_VP)) {
                        vlan_hwaccel_rx(skb, adapter->vlgrp,
                                (rx_desc->special & E1000_RXD_SPC_VLAN_MASK));
                } else {
                        netif_receive_skb(skb);
                }
                netdev->last_rx = jiffies;

                rx_desc->status = 0;
                rx_ring->buffer_info[i].skb = NULL;

                i = (i + 1) % rx_ring->count;

                rx_desc = E1000_RX_DESC(*rx_ring, i);
                received++;
        }

        if(!received)
                received = 1;

        e1000_alloc_rx_buffers(adapter);
        
        rx_ring->next_to_clean = i;
        netdev->quota -= received;
        *budget -= received;

        netif_rx_complete(netdev);

        e1000_irq_enable(adapter);
        return 0;

not_done:

        e1000_alloc_rx_buffers(adapter);
        
        rx_ring->next_to_clean = i;
        netdev->quota -= received;
        *budget -= received;

        return 1;
}
#else
/**
 * e1000_clean_rx_irq - Send received data up the network stack,
 * @adapter: board private structure
 **/

static void
e1000_clean_rx_irq(struct e1000_adapter *adapter)
{
        struct e1000_desc_ring *rx_ring = &adapter->rx_ring;
        struct net_device *netdev = adapter->netdev;
        struct pci_dev *pdev = adapter->pdev;
        struct e1000_rx_desc *rx_desc;
        struct sk_buff *skb;
        unsigned long flags;
        uint32_t length;
        uint8_t last_byte;
        int i;

        i = rx_ring->next_to_clean;
        rx_desc = E1000_RX_DESC(*rx_ring, i);

        while(rx_desc->status & E1000_RXD_STAT_DD) {

                pci_unmap_single(pdev,
                                 rx_ring->buffer_info[i].dma,
                                 rx_ring->buffer_info[i].length,
                                 PCI_DMA_FROMDEVICE);

                skb = rx_ring->buffer_info[i].skb;
                length = le16_to_cpu(rx_desc->length);

                if(!(rx_desc->status & E1000_RXD_STAT_EOP)) {

                        /* All receives must fit into a single buffer */

                        E1000_DBG("Receive packet consumed multiple buffers\n");

                        dev_kfree_skb_irq(skb);
                        rx_desc->status = 0;
                        rx_ring->buffer_info[i].skb = NULL;

                        i = (i + 1) % rx_ring->count;

                        rx_desc = E1000_RX_DESC(*rx_ring, i);
                        continue;
                }

                if(rx_desc->errors & E1000_RXD_ERR_FRAME_ERR_MASK) {

                        last_byte = *(skb->data + length - 1);

                        if(TBI_ACCEPT(&adapter->hw, rx_desc->status,
                                      rx_desc->errors, length, last_byte)) {

                                spin_lock_irqsave(&adapter->stats_lock, flags);

                                e1000_tbi_adjust_stats(&adapter->hw,
                                                       &adapter->stats,
                                                       length, skb->data);

                                spin_unlock_irqrestore(&adapter->stats_lock,
                                                       flags);
                                length--;
                        } else {

                                dev_kfree_skb_irq(skb);
                                rx_desc->status = 0;
                                rx_ring->buffer_info[i].skb = NULL;

                                i = (i + 1) % rx_ring->count;

                                rx_desc = E1000_RX_DESC(*rx_ring, i);
                                continue;
                        }
                }

                /* Good Receive */
                skb_put(skb, length - ETHERNET_FCS_SIZE);

                /* Receive Checksum Offload */
                e1000_rx_checksum(adapter, rx_desc, skb);

                skb->protocol = eth_type_trans(skb, netdev);
                if(adapter->vlgrp && (rx_desc->status & E1000_RXD_STAT_VP)) {
                        vlan_hwaccel_rx(skb, adapter->vlgrp,
                                (rx_desc->special & E1000_RXD_SPC_VLAN_MASK));
                } else {
                        netif_rx(skb);
                }
                netdev->last_rx = jiffies;

                rx_desc->status = 0;
                rx_ring->buffer_info[i].skb = NULL;

                i = (i + 1) % rx_ring->count;

                rx_desc = E1000_RX_DESC(*rx_ring, i);
        }

        rx_ring->next_to_clean = i;

        e1000_alloc_rx_buffers(adapter);
}
#endif

/**
 * e1000_alloc_rx_buffers - Replace used receive buffers
 * @data: address of board private structure
 **/

static void
e1000_alloc_rx_buffers(struct e1000_adapter *adapter)
{
        struct e1000_desc_ring *rx_ring = &adapter->rx_ring;
        struct net_device *netdev = adapter->netdev;
        struct pci_dev *pdev = adapter->pdev;
        struct e1000_rx_desc *rx_desc;
        struct sk_buff *skb;
        int reserve_len;
        int i;

        reserve_len = 2;

        i = rx_ring->next_to_use;

        while(!rx_ring->buffer_info[i].skb) {
                rx_desc = E1000_RX_DESC(*rx_ring, i);

                skb = alloc_skb(adapter->rx_buffer_len + reserve_len,
                                GFP_ATOMIC);

                if(!skb) {
                        /* Better luck next round */
                        break;
                }

                /* Make buffer alignment 2 beyond a 16 byte boundary
                 * this will result in a 16 byte aligned IP header after
                 * the 14 byte MAC header is removed
                 */
                skb_reserve(skb, reserve_len);

                skb->dev = netdev;

                rx_ring->buffer_info[i].skb = skb;
                rx_ring->buffer_info[i].length = adapter->rx_buffer_len;
                rx_ring->buffer_info[i].dma =
                        pci_map_single(pdev,
                                       skb->data,
                                       adapter->rx_buffer_len,
                                       PCI_DMA_FROMDEVICE);

                rx_desc->buffer_addr = cpu_to_le64(rx_ring->buffer_info[i].dma);

                if(!(i % E1000_RX_BUFFER_WRITE)) {
                        /* Force memory writes to complete before letting h/w
                         * know there are new descriptors to fetch.  (Only
                         * applicable for weak-ordered memory model archs,
                         * such as IA-64). */
                        wmb();

                        E1000_WRITE_REG(&adapter->hw, RDT, i);
                }

                i = (i + 1) % rx_ring->count;
        }

        rx_ring->next_to_use = i;
}

/**
 * e1000_ioctl -
 * @netdev:
 * @ifreq:
 * @cmd:
 **/

static int
e1000_ioctl(struct net_device *netdev, struct ifreq *ifr, int cmd)
{
        switch (cmd) {
        case SIOCETHTOOL:
                return e1000_ethtool_ioctl(netdev, ifr);
        default:
                return -EOPNOTSUPP;
        }
}

/**
 * e1000_rx_checksum - Receive Checksum Offload for 82543
 * @adapter: board private structure
 * @rx_desc: receive descriptor
 * @sk_buff: socket buffer with received data
 **/

static inline void
e1000_rx_checksum(struct e1000_adapter *adapter,
                  struct e1000_rx_desc *rx_desc,
                  struct sk_buff *skb)
{
        /* 82543 or newer only */
        if((adapter->hw.mac_type < e1000_82543) ||
        /* Ignore Checksum bit is set */
        (rx_desc->status & E1000_RXD_STAT_IXSM) ||
        /* TCP Checksum has not been calculated */
        (!(rx_desc->status & E1000_RXD_STAT_TCPCS))) {
                skb->ip_summed = CHECKSUM_NONE;
                return;
        }

        /* At this point we know the hardware did the TCP checksum */
        /* now look at the TCP checksum error bit */
        if(rx_desc->errors & E1000_RXD_ERR_TCPE) {
                /* let the stack verify checksum errors */
                skb->ip_summed = CHECKSUM_NONE;
                adapter->hw_csum_err++;
        } else {
        /* TCP checksum is good */
                skb->ip_summed = CHECKSUM_UNNECESSARY;
                adapter->hw_csum_good++;
        }
}

void
e1000_pci_set_mwi(struct e1000_hw *hw)
{
        struct e1000_adapter *adapter = hw->back;

        pci_set_mwi(adapter->pdev);
}

void
e1000_pci_clear_mwi(struct e1000_hw *hw)
{
        struct e1000_adapter *adapter = hw->back;

        pci_clear_mwi(adapter->pdev);
}

void
e1000_read_pci_cfg(struct e1000_hw *hw, uint32_t reg, uint16_t *value)
{
        struct e1000_adapter *adapter = hw->back;

        pci_read_config_word(adapter->pdev, reg, value);
}

void
e1000_write_pci_cfg(struct e1000_hw *hw, uint32_t reg, uint16_t *value)
{
        struct e1000_adapter *adapter = hw->back;

        pci_write_config_word(adapter->pdev, reg, *value);
}

uint32_t
e1000_io_read(struct e1000_hw *hw, uint32_t port)
{
        return inl(port);
}

void
e1000_io_write(struct e1000_hw *hw, uint32_t port, uint32_t value)
{
        outl(value, port);
}

static void
e1000_vlan_rx_register(struct net_device *netdev, struct vlan_group *grp)
{
        struct e1000_adapter *adapter = netdev->priv;
        uint32_t ctrl, rctl;

        e1000_irq_disable(adapter);
        adapter->vlgrp = grp;

        if(grp) {
                /* enable VLAN tag insert/strip */

                E1000_WRITE_REG(&adapter->hw, VET, ETHERNET_IEEE_VLAN_TYPE);

                ctrl = E1000_READ_REG(&adapter->hw, CTRL);
                ctrl |= E1000_CTRL_VME;
                E1000_WRITE_REG(&adapter->hw, CTRL, ctrl);

                /* enable VLAN receive filtering */

                rctl = E1000_READ_REG(&adapter->hw, RCTL);
                rctl |= E1000_RCTL_VFE;
                rctl &= ~E1000_RCTL_CFIEN;
                E1000_WRITE_REG(&adapter->hw, RCTL, rctl);
        } else {
                /* disable VLAN tag insert/strip */

                ctrl = E1000_READ_REG(&adapter->hw, CTRL);
                ctrl &= ~E1000_CTRL_VME;
                E1000_WRITE_REG(&adapter->hw, CTRL, ctrl);

                /* disable VLAN filtering */

                rctl = E1000_READ_REG(&adapter->hw, RCTL);
                rctl &= ~E1000_RCTL_VFE;
                E1000_WRITE_REG(&adapter->hw, RCTL, rctl);
        }

        e1000_irq_enable(adapter);
}

static void
e1000_vlan_rx_add_vid(struct net_device *netdev, uint16_t vid)
{
        struct e1000_adapter *adapter = netdev->priv;
        uint32_t vfta, index;

        /* add VID to filter table */

        index = (vid >> 5) & 0x7F;
        vfta = E1000_READ_REG_ARRAY(&adapter->hw, VFTA, index);
        vfta |= (1 << (vid & 0x1F));
        e1000_write_vfta(&adapter->hw, index, vfta);
}

static void
e1000_vlan_rx_kill_vid(struct net_device *netdev, uint16_t vid)
{
        struct e1000_adapter *adapter = netdev->priv;
        uint32_t vfta, index;

        e1000_irq_disable(adapter);

        if(adapter->vlgrp)
                adapter->vlgrp->vlan_devices[vid] = NULL;

        e1000_irq_enable(adapter);

        /* remove VID from filter table*/

        index = (vid >> 5) & 0x7F;
        vfta = E1000_READ_REG_ARRAY(&adapter->hw, VFTA, index);
        vfta &= ~(1 << (vid & 0x1F));
        e1000_write_vfta(&adapter->hw, index, vfta);
}

static int
e1000_notify_reboot(struct notifier_block *nb, unsigned long event, void *p)
{
        struct pci_dev *pdev = NULL;

        switch(event) {
        case SYS_DOWN:
        case SYS_HALT:
        case SYS_POWER_OFF:
                pci_for_each_dev(pdev) {
                        if(pci_dev_driver(pdev) == &e1000_driver)
                                e1000_suspend(pdev, 3);
                }
        }
        return NOTIFY_DONE;
}

static int
e1000_suspend(struct pci_dev *pdev, uint32_t state)
{
        struct net_device *netdev = pci_get_drvdata(pdev);
        struct e1000_adapter *adapter = netdev->priv;
        uint32_t ctrl, ctrl_ext, rctl, manc;

        netif_device_detach(netdev);

        if(netif_running(netdev))
                e1000_down(adapter);

        if(adapter->wol) {
                e1000_setup_rctl(adapter);
                e1000_set_multi(netdev);

                if(adapter->wol & E1000_WUFC_MC) {
                        rctl = E1000_READ_REG(&adapter->hw, RCTL);
                        rctl |= E1000_RCTL_MPE;
                        E1000_WRITE_REG(&adapter->hw, RCTL, rctl);
                }

                if(adapter->hw.media_type == e1000_media_type_fiber) {
                        #define E1000_CTRL_ADVD3WUC 0x00100000
                        ctrl = E1000_READ_REG(&adapter->hw, CTRL);
                        ctrl |= E1000_CTRL_ADVD3WUC;
                        E1000_WRITE_REG(&adapter->hw, CTRL, ctrl);

                        ctrl_ext = E1000_READ_REG(&adapter->hw, CTRL_EXT);
                        ctrl_ext |= E1000_CTRL_EXT_SDP7_DATA;
                        E1000_WRITE_REG(&adapter->hw, CTRL_EXT, ctrl_ext);
                }

                E1000_WRITE_REG(&adapter->hw, WUC, 0);
                E1000_WRITE_REG(&adapter->hw, WUFC, adapter->wol);
                pci_enable_wake(pdev, 3, 1);
        } else {
                E1000_WRITE_REG(&adapter->hw, WUC, 0);
                E1000_WRITE_REG(&adapter->hw, WUFC, 0);
                pci_enable_wake(pdev, 3, 0);
        }

        pci_save_state(pdev, adapter->pci_state);

        if(adapter->hw.mac_type >= e1000_82540) {
                manc = E1000_READ_REG(&adapter->hw, MANC);
                if(manc & E1000_MANC_SMBUS_EN) {
                        manc |= E1000_MANC_ARP_EN;
                        E1000_WRITE_REG(&adapter->hw, MANC, manc);
                }
        } else
                pci_set_power_state(pdev, 3);

        return 0;
}

#ifdef CONFIG_PM
static int
e1000_resume(struct pci_dev *pdev)
{
        struct net_device *netdev = pci_get_drvdata(pdev);
        struct e1000_adapter *adapter = netdev->priv;
        uint32_t manc;

        pci_set_power_state(pdev, 0);
        pci_restore_state(pdev, adapter->pci_state);
        pci_enable_wake(pdev, 0, 0);

        /* Clear the wakeup status bits */

        E1000_WRITE_REG(&adapter->hw, WUS, ~0);

        if(netif_running(netdev))
                e1000_up(adapter);

        netif_device_attach(netdev);

        if(adapter->hw.mac_type >= e1000_82540) {
                manc = E1000_READ_REG(&adapter->hw, MANC);
                manc &= ~(E1000_MANC_ARP_EN);
                E1000_WRITE_REG(&adapter->hw, MANC, manc);
        }

        return 0;
}
#endif

/* e1000_main.c */