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ixgb_main.c

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

  
  Copyright(c) 1999 - 2006 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

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

#include "ixgb.h"

char ixgb_driver_name[] = "ixgb";
static char ixgb_driver_string[] = "Intel(R) PRO/10GbE Network Driver";

#ifndef CONFIG_IXGB_NAPI
#define DRIVERNAPI
#else
#define DRIVERNAPI "-NAPI"
#endif
#define DRV_VERSION           "1.0.109-k2"DRIVERNAPI
char ixgb_driver_version[] = DRV_VERSION;
static char ixgb_copyright[] = "Copyright (c) 1999-2006 Intel Corporation.";

/* ixgb_pci_tbl - PCI Device ID Table
 *
 * Wildcard entries (PCI_ANY_ID) should come last
 * Last entry must be all 0s
 *
 * { Vendor ID, Device ID, SubVendor ID, SubDevice ID,
 *   Class, Class Mask, private data (not used) }
 */
static struct pci_device_id ixgb_pci_tbl[] = {
      {INTEL_VENDOR_ID, IXGB_DEVICE_ID_82597EX,
       PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
      {INTEL_VENDOR_ID, IXGB_DEVICE_ID_82597EX_CX4,
       PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
      {INTEL_VENDOR_ID, IXGB_DEVICE_ID_82597EX_SR,
       PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
      {INTEL_VENDOR_ID, IXGB_DEVICE_ID_82597EX_LR,  
       PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},

      /* required last entry */
      {0,}
};

MODULE_DEVICE_TABLE(pci, ixgb_pci_tbl);

/* Local Function Prototypes */

int ixgb_up(struct ixgb_adapter *adapter);
void ixgb_down(struct ixgb_adapter *adapter, boolean_t kill_watchdog);
void ixgb_reset(struct ixgb_adapter *adapter);
int ixgb_setup_tx_resources(struct ixgb_adapter *adapter);
int ixgb_setup_rx_resources(struct ixgb_adapter *adapter);
void ixgb_free_tx_resources(struct ixgb_adapter *adapter);
void ixgb_free_rx_resources(struct ixgb_adapter *adapter);
void ixgb_update_stats(struct ixgb_adapter *adapter);

static int ixgb_init_module(void);
static void ixgb_exit_module(void);
static int ixgb_probe(struct pci_dev *pdev, const struct pci_device_id *ent);
static void __devexit ixgb_remove(struct pci_dev *pdev);
static int ixgb_sw_init(struct ixgb_adapter *adapter);
static int ixgb_open(struct net_device *netdev);
static int ixgb_close(struct net_device *netdev);
static void ixgb_configure_tx(struct ixgb_adapter *adapter);
static void ixgb_configure_rx(struct ixgb_adapter *adapter);
static void ixgb_setup_rctl(struct ixgb_adapter *adapter);
static void ixgb_clean_tx_ring(struct ixgb_adapter *adapter);
static void ixgb_clean_rx_ring(struct ixgb_adapter *adapter);
static void ixgb_set_multi(struct net_device *netdev);
static void ixgb_watchdog(unsigned long data);
static int ixgb_xmit_frame(struct sk_buff *skb, struct net_device *netdev);
static struct net_device_stats *ixgb_get_stats(struct net_device *netdev);
static int ixgb_change_mtu(struct net_device *netdev, int new_mtu);
static int ixgb_set_mac(struct net_device *netdev, void *p);
static irqreturn_t ixgb_intr(int irq, void *data, struct pt_regs *regs);
static boolean_t ixgb_clean_tx_irq(struct ixgb_adapter *adapter);

#ifdef CONFIG_IXGB_NAPI
static int ixgb_clean(struct net_device *netdev, int *budget);
static boolean_t ixgb_clean_rx_irq(struct ixgb_adapter *adapter,
                           int *work_done, int work_to_do);
#else
static boolean_t ixgb_clean_rx_irq(struct ixgb_adapter *adapter);
#endif
static void ixgb_alloc_rx_buffers(struct ixgb_adapter *adapter);
void ixgb_set_ethtool_ops(struct net_device *netdev);
static void ixgb_tx_timeout(struct net_device *dev);
static void ixgb_tx_timeout_task(struct net_device *dev);
static void ixgb_vlan_rx_register(struct net_device *netdev,
                          struct vlan_group *grp);
static void ixgb_vlan_rx_add_vid(struct net_device *netdev, uint16_t vid);
static void ixgb_vlan_rx_kill_vid(struct net_device *netdev, uint16_t vid);
static void ixgb_restore_vlan(struct ixgb_adapter *adapter);

#ifdef CONFIG_NET_POLL_CONTROLLER
/* for netdump / net console */
static void ixgb_netpoll(struct net_device *dev);
#endif

/* Exported from other modules */

extern void ixgb_check_options(struct ixgb_adapter *adapter);

static struct pci_driver ixgb_driver = {
      .name     = ixgb_driver_name,
      .id_table = ixgb_pci_tbl,
      .probe    = ixgb_probe,
      .remove   = __devexit_p(ixgb_remove),
};

MODULE_AUTHOR("Intel Corporation, <linux.nics@intel.com>");
MODULE_DESCRIPTION("Intel(R) PRO/10GbE Network Driver");
MODULE_LICENSE("GPL");
MODULE_VERSION(DRV_VERSION);

#define DEFAULT_DEBUG_LEVEL_SHIFT 3
static int debug = DEFAULT_DEBUG_LEVEL_SHIFT;
module_param(debug, int, 0);
MODULE_PARM_DESC(debug, "Debug level (0=none,...,16=all)");

/* some defines for controlling descriptor fetches in h/w */
#define RXDCTL_WTHRESH_DEFAULT 16   /* chip writes back at this many or RXT0 */
#define RXDCTL_PTHRESH_DEFAULT 0          /* chip considers prefech below
                                     * this */
#define RXDCTL_HTHRESH_DEFAULT 0          /* chip will only prefetch if tail
                                     * is pushed this many descriptors
                                     * from head */

/**
 * ixgb_init_module - Driver Registration Routine
 *
 * ixgb_init_module is the first routine called when the driver is
 * loaded. All it does is register with the PCI subsystem.
 **/

static int __init
ixgb_init_module(void)
{
      printk(KERN_INFO "%s - version %s\n",
             ixgb_driver_string, ixgb_driver_version);

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

      return pci_module_init(&ixgb_driver);
}

module_init(ixgb_init_module);

/**
 * ixgb_exit_module - Driver Exit Cleanup Routine
 *
 * ixgb_exit_module is called just before the driver is removed
 * from memory.
 **/

static void __exit
ixgb_exit_module(void)
{
      pci_unregister_driver(&ixgb_driver);
}

module_exit(ixgb_exit_module);

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

static void
ixgb_irq_disable(struct ixgb_adapter *adapter)
{
      atomic_inc(&adapter->irq_sem);
      IXGB_WRITE_REG(&adapter->hw, IMC, ~0);
      IXGB_WRITE_FLUSH(&adapter->hw);
      synchronize_irq(adapter->pdev->irq);
}

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

static void
ixgb_irq_enable(struct ixgb_adapter *adapter)
{
      if(atomic_dec_and_test(&adapter->irq_sem)) {
            IXGB_WRITE_REG(&adapter->hw, IMS,
                         IXGB_INT_RXT0 | IXGB_INT_RXDMT0 | IXGB_INT_TXDW |
                         IXGB_INT_LSC);
            IXGB_WRITE_FLUSH(&adapter->hw);
      }
}

int
ixgb_up(struct ixgb_adapter *adapter)
{
      struct net_device *netdev = adapter->netdev;
      int err;
      int max_frame = netdev->mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;
      struct ixgb_hw *hw = &adapter->hw;

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

      ixgb_rar_set(hw, netdev->dev_addr, 0);
      ixgb_set_multi(netdev);

      ixgb_restore_vlan(adapter);

      ixgb_configure_tx(adapter);
      ixgb_setup_rctl(adapter);
      ixgb_configure_rx(adapter);
      ixgb_alloc_rx_buffers(adapter);

      /* disable interrupts and get the hardware into a known state */
      IXGB_WRITE_REG(&adapter->hw, IMC, 0xffffffff);

#ifdef CONFIG_PCI_MSI
      {
      boolean_t pcix = (IXGB_READ_REG(&adapter->hw, STATUS) & 
                                      IXGB_STATUS_PCIX_MODE) ? TRUE : FALSE;
      adapter->have_msi = TRUE;

      if (!pcix)
         adapter->have_msi = FALSE;
      else if((err = pci_enable_msi(adapter->pdev))) {
            DPRINTK(PROBE, ERR,
             "Unable to allocate MSI interrupt Error: %d\n", err);
            adapter->have_msi = FALSE;
            /* proceed to try to request regular interrupt */
      }
      }

#endif
      if((err = request_irq(adapter->pdev->irq, &ixgb_intr,
                          IRQF_SHARED | IRQF_SAMPLE_RANDOM,
                            netdev->name, netdev))) {
            DPRINTK(PROBE, ERR,
             "Unable to allocate interrupt Error: %d\n", err);
            return err;
      }

      if((hw->max_frame_size != max_frame) ||
            (hw->max_frame_size !=
            (IXGB_READ_REG(hw, MFS) >> IXGB_MFS_SHIFT))) {

            hw->max_frame_size = max_frame;

            IXGB_WRITE_REG(hw, MFS, hw->max_frame_size << IXGB_MFS_SHIFT);

            if(hw->max_frame_size >
               IXGB_MAX_ENET_FRAME_SIZE_WITHOUT_FCS + ENET_FCS_LENGTH) {
                  uint32_t ctrl0 = IXGB_READ_REG(hw, CTRL0);

                  if(!(ctrl0 & IXGB_CTRL0_JFE)) {
                        ctrl0 |= IXGB_CTRL0_JFE;
                        IXGB_WRITE_REG(hw, CTRL0, ctrl0);
                  }
            }
      }

      mod_timer(&adapter->watchdog_timer, jiffies);

#ifdef CONFIG_IXGB_NAPI
      netif_poll_enable(netdev);
#endif
      ixgb_irq_enable(adapter);

      return 0;
}

void
ixgb_down(struct ixgb_adapter *adapter, boolean_t kill_watchdog)
{
      struct net_device *netdev = adapter->netdev;

      ixgb_irq_disable(adapter);
      free_irq(adapter->pdev->irq, netdev);
#ifdef CONFIG_PCI_MSI
      if(adapter->have_msi == TRUE)
            pci_disable_msi(adapter->pdev);

#endif
      if(kill_watchdog)
            del_timer_sync(&adapter->watchdog_timer);
#ifdef CONFIG_IXGB_NAPI
      netif_poll_disable(netdev);
#endif
      adapter->link_speed = 0;
      adapter->link_duplex = 0;
      netif_carrier_off(netdev);
      netif_stop_queue(netdev);

      ixgb_reset(adapter);
      ixgb_clean_tx_ring(adapter);
      ixgb_clean_rx_ring(adapter);
}

void
ixgb_reset(struct ixgb_adapter *adapter)
{

      ixgb_adapter_stop(&adapter->hw);
      if(!ixgb_init_hw(&adapter->hw))
            DPRINTK(PROBE, ERR, "ixgb_init_hw failed.\n");
}

/**
 * ixgb_probe - Device Initialization Routine
 * @pdev: PCI device information struct
 * @ent: entry in ixgb_pci_tbl
 *
 * Returns 0 on success, negative on failure
 *
 * ixgb_probe initializes an adapter identified by a pci_dev structure.
 * The OS initialization, configuring of the adapter private structure,
 * and a hardware reset occur.
 **/

static int __devinit
ixgb_probe(struct pci_dev *pdev,
            const struct pci_device_id *ent)
{
      struct net_device *netdev = NULL;
      struct ixgb_adapter *adapter;
      static int cards_found = 0;
      unsigned long mmio_start;
      int mmio_len;
      int pci_using_dac;
      int i;
      int err;

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

      if(!(err = pci_set_dma_mask(pdev, DMA_64BIT_MASK)) &&
         !(err = pci_set_consistent_dma_mask(pdev, DMA_64BIT_MASK))) {
            pci_using_dac = 1;
      } else {
            if((err = pci_set_dma_mask(pdev, DMA_32BIT_MASK)) ||
               (err = pci_set_consistent_dma_mask(pdev, DMA_32BIT_MASK))) {
                  printk(KERN_ERR
                   "ixgb: No usable DMA configuration, aborting\n");
                  goto err_dma_mask;
            }
            pci_using_dac = 0;
      }

      if((err = pci_request_regions(pdev, ixgb_driver_name)))
            goto err_request_regions;

      pci_set_master(pdev);

      netdev = alloc_etherdev(sizeof(struct ixgb_adapter));
      if(!netdev) {
            err = -ENOMEM;
            goto err_alloc_etherdev;
      }

      SET_MODULE_OWNER(netdev);
      SET_NETDEV_DEV(netdev, &pdev->dev);

      pci_set_drvdata(pdev, netdev);
      adapter = netdev_priv(netdev);
      adapter->netdev = netdev;
      adapter->pdev = pdev;
      adapter->hw.back = adapter;
      adapter->msg_enable = netif_msg_init(debug, DEFAULT_DEBUG_LEVEL_SHIFT);

      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) {
            err = -EIO;
            goto err_ioremap;
      }

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

      netdev->open = &ixgb_open;
      netdev->stop = &ixgb_close;
      netdev->hard_start_xmit = &ixgb_xmit_frame;
      netdev->get_stats = &ixgb_get_stats;
      netdev->set_multicast_list = &ixgb_set_multi;
      netdev->set_mac_address = &ixgb_set_mac;
      netdev->change_mtu = &ixgb_change_mtu;
      ixgb_set_ethtool_ops(netdev);
      netdev->tx_timeout = &ixgb_tx_timeout;
      netdev->watchdog_timeo = 5 * HZ;
#ifdef CONFIG_IXGB_NAPI
      netdev->poll = &ixgb_clean;
      netdev->weight = 64;
#endif
      netdev->vlan_rx_register = ixgb_vlan_rx_register;
      netdev->vlan_rx_add_vid = ixgb_vlan_rx_add_vid;
      netdev->vlan_rx_kill_vid = ixgb_vlan_rx_kill_vid;
#ifdef CONFIG_NET_POLL_CONTROLLER
      netdev->poll_controller = ixgb_netpoll;
#endif

      strcpy(netdev->name, pci_name(pdev));
      netdev->mem_start = mmio_start;
      netdev->mem_end = mmio_start + mmio_len;
      netdev->base_addr = adapter->hw.io_base;

      adapter->bd_number = cards_found;
      adapter->link_speed = 0;
      adapter->link_duplex = 0;

      /* setup the private structure */

      if((err = ixgb_sw_init(adapter)))
            goto err_sw_init;

      netdev->features = NETIF_F_SG |
                     NETIF_F_HW_CSUM |
                     NETIF_F_HW_VLAN_TX |
                     NETIF_F_HW_VLAN_RX |
                     NETIF_F_HW_VLAN_FILTER;
#ifdef NETIF_F_TSO
      netdev->features |= NETIF_F_TSO;
#endif
#ifdef NETIF_F_LLTX
      netdev->features |= NETIF_F_LLTX;
#endif

      if(pci_using_dac)
            netdev->features |= NETIF_F_HIGHDMA;

      /* make sure the EEPROM is good */

      if(!ixgb_validate_eeprom_checksum(&adapter->hw)) {
            DPRINTK(PROBE, ERR, "The EEPROM Checksum Is Not Valid\n");
            err = -EIO;
            goto err_eeprom;
      }

      ixgb_get_ee_mac_addr(&adapter->hw, netdev->dev_addr);
      memcpy(netdev->perm_addr, netdev->dev_addr, netdev->addr_len);

      if(!is_valid_ether_addr(netdev->perm_addr)) {
            DPRINTK(PROBE, ERR, "Invalid MAC Address\n");
            err = -EIO;
            goto err_eeprom;
      }

      adapter->part_num = ixgb_get_ee_pba_number(&adapter->hw);

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

      INIT_WORK(&adapter->tx_timeout_task,
              (void (*)(void *))ixgb_tx_timeout_task, netdev);

      strcpy(netdev->name, "eth%d");
      if((err = register_netdev(netdev)))
            goto err_register;

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

      netif_carrier_off(netdev);
      netif_stop_queue(netdev);

      DPRINTK(PROBE, INFO, "Intel(R) PRO/10GbE Network Connection\n");
      ixgb_check_options(adapter);
      /* reset the hardware with the new settings */

      ixgb_reset(adapter);

      cards_found++;
      return 0;

err_register:
err_sw_init:
err_eeprom:
      iounmap(adapter->hw.hw_addr);
err_ioremap:
      free_netdev(netdev);
err_alloc_etherdev:
      pci_release_regions(pdev);
err_request_regions:
err_dma_mask:
      pci_disable_device(pdev);
      return err;
}

/**
 * ixgb_remove - Device Removal Routine
 * @pdev: PCI device information struct
 *
 * ixgb_remove is called by the PCI subsystem to alert the driver
 * that it should release a PCI device.  The could be caused by a
 * Hot-Plug event, or because the driver is going to be removed from
 * memory.
 **/

static void __devexit
ixgb_remove(struct pci_dev *pdev)
{
      struct net_device *netdev = pci_get_drvdata(pdev);
      struct ixgb_adapter *adapter = netdev_priv(netdev);

      unregister_netdev(netdev);

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

      free_netdev(netdev);
}

/**
 * ixgb_sw_init - Initialize general software structures (struct ixgb_adapter)
 * @adapter: board private structure to initialize
 *
 * ixgb_sw_init initializes the Adapter private data structure.
 * Fields are initialized based on PCI device information and
 * OS network device settings (MTU size).
 **/

static int __devinit
ixgb_sw_init(struct ixgb_adapter *adapter)
{
      struct ixgb_hw *hw = &adapter->hw;
      struct net_device *netdev = adapter->netdev;
      struct pci_dev *pdev = adapter->pdev;

      /* PCI config space info */

      hw->vendor_id = pdev->vendor;
      hw->device_id = pdev->device;
      hw->subsystem_vendor_id = pdev->subsystem_vendor;
      hw->subsystem_id = pdev->subsystem_device;

      hw->max_frame_size = netdev->mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;
      adapter->rx_buffer_len = hw->max_frame_size;

      if((hw->device_id == IXGB_DEVICE_ID_82597EX)
         || (hw->device_id == IXGB_DEVICE_ID_82597EX_CX4)
         || (hw->device_id == IXGB_DEVICE_ID_82597EX_LR)
         || (hw->device_id == IXGB_DEVICE_ID_82597EX_SR))
                  hw->mac_type = ixgb_82597;
      else {
            /* should never have loaded on this device */
            DPRINTK(PROBE, ERR, "unsupported device id\n");
      }

      /* enable flow control to be programmed */
      hw->fc.send_xon = 1;

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

      return 0;
}

/**
 * ixgb_open - Called when a network interface is made active
 * @netdev: network interface device structure
 *
 * Returns 0 on success, negative value on failure
 *
 * The open entry point is called when a network interface is made
 * active by the system (IFF_UP).  At this point all resources needed
 * for transmit and receive operations are allocated, the interrupt
 * handler is registered with the OS, the watchdog timer is started,
 * and the stack is notified that the interface is ready.
 **/

static int
ixgb_open(struct net_device *netdev)
{
      struct ixgb_adapter *adapter = netdev_priv(netdev);
      int err;

      /* allocate transmit descriptors */

      if((err = ixgb_setup_tx_resources(adapter)))
            goto err_setup_tx;

      /* allocate receive descriptors */

      if((err = ixgb_setup_rx_resources(adapter)))
            goto err_setup_rx;

      if((err = ixgb_up(adapter)))
            goto err_up;

      return 0;

err_up:
      ixgb_free_rx_resources(adapter);
err_setup_rx:
      ixgb_free_tx_resources(adapter);
err_setup_tx:
      ixgb_reset(adapter);

      return err;
}

/**
 * ixgb_close - Disables a network interface
 * @netdev: network interface device structure
 *
 * Returns 0, this is not allowed to fail
 *
 * The close entry point is called when an interface is de-activated
 * by the OS.  The hardware is still under the drivers control, but
 * needs to be disabled.  A global MAC reset is issued to stop the
 * hardware, and all transmit and receive resources are freed.
 **/

static int
ixgb_close(struct net_device *netdev)
{
      struct ixgb_adapter *adapter = netdev_priv(netdev);

      ixgb_down(adapter, TRUE);

      ixgb_free_tx_resources(adapter);
      ixgb_free_rx_resources(adapter);

      return 0;
}

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

int
ixgb_setup_tx_resources(struct ixgb_adapter *adapter)
{
      struct ixgb_desc_ring *txdr = &adapter->tx_ring;
      struct pci_dev *pdev = adapter->pdev;
      int size;

      size = sizeof(struct ixgb_buffer) * txdr->count;
      txdr->buffer_info = vmalloc(size);
      if(!txdr->buffer_info) {
            DPRINTK(PROBE, ERR,
             "Unable to allocate transmit descriptor ring memory\n");
            return -ENOMEM;
      }
      memset(txdr->buffer_info, 0, size);

      /* round up to nearest 4K */

      txdr->size = txdr->count * sizeof(struct ixgb_tx_desc);
      IXGB_ROUNDUP(txdr->size, 4096);

      txdr->desc = pci_alloc_consistent(pdev, txdr->size, &txdr->dma);
      if(!txdr->desc) {
            vfree(txdr->buffer_info);
            DPRINTK(PROBE, ERR,
             "Unable to allocate transmit descriptor memory\n");
            return -ENOMEM;
      }
      memset(txdr->desc, 0, txdr->size);

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

      return 0;
}

/**
 * ixgb_configure_tx - Configure 82597 Transmit Unit after Reset.
 * @adapter: board private structure
 *
 * Configure the Tx unit of the MAC after a reset.
 **/

static void
ixgb_configure_tx(struct ixgb_adapter *adapter)
{
      uint64_t tdba = adapter->tx_ring.dma;
      uint32_t tdlen = adapter->tx_ring.count * sizeof(struct ixgb_tx_desc);
      uint32_t tctl;
      struct ixgb_hw *hw = &adapter->hw;

      /* Setup the Base and Length of the Tx Descriptor Ring 
       * tx_ring.dma can be either a 32 or 64 bit value 
       */

      IXGB_WRITE_REG(hw, TDBAL, (tdba & 0x00000000ffffffffULL));
      IXGB_WRITE_REG(hw, TDBAH, (tdba >> 32));

      IXGB_WRITE_REG(hw, TDLEN, tdlen);

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

      IXGB_WRITE_REG(hw, TDH, 0);
      IXGB_WRITE_REG(hw, TDT, 0);

      /* don't set up txdctl, it induces performance problems if configured
       * incorrectly */
      /* Set the Tx Interrupt Delay register */

      IXGB_WRITE_REG(hw, TIDV, adapter->tx_int_delay);

      /* Program the Transmit Control Register */

      tctl = IXGB_TCTL_TCE | IXGB_TCTL_TXEN | IXGB_TCTL_TPDE;
      IXGB_WRITE_REG(hw, TCTL, tctl);

      /* Setup Transmit Descriptor Settings for this adapter */
      adapter->tx_cmd_type =
            IXGB_TX_DESC_TYPE 
            | (adapter->tx_int_delay_enable ? IXGB_TX_DESC_CMD_IDE : 0);
}

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

int
ixgb_setup_rx_resources(struct ixgb_adapter *adapter)
{
      struct ixgb_desc_ring *rxdr = &adapter->rx_ring;
      struct pci_dev *pdev = adapter->pdev;
      int size;

      size = sizeof(struct ixgb_buffer) * rxdr->count;
      rxdr->buffer_info = vmalloc(size);
      if(!rxdr->buffer_info) {
            DPRINTK(PROBE, ERR,
             "Unable to allocate receive descriptor ring\n");
            return -ENOMEM;
      }
      memset(rxdr->buffer_info, 0, size);

      /* Round up to nearest 4K */

      rxdr->size = rxdr->count * sizeof(struct ixgb_rx_desc);
      IXGB_ROUNDUP(rxdr->size, 4096);

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

      if(!rxdr->desc) {
            vfree(rxdr->buffer_info);
            DPRINTK(PROBE, ERR,
             "Unable to allocate receive descriptors\n");
            return -ENOMEM;
      }
      memset(rxdr->desc, 0, rxdr->size);

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

      return 0;
}

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

static void
ixgb_setup_rctl(struct ixgb_adapter *adapter)
{
      uint32_t rctl;

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

      rctl &= ~(3 << IXGB_RCTL_MO_SHIFT);

      rctl |=
            IXGB_RCTL_BAM | IXGB_RCTL_RDMTS_1_2 | 
            IXGB_RCTL_RXEN | IXGB_RCTL_CFF | 
            (adapter->hw.mc_filter_type << IXGB_RCTL_MO_SHIFT);

      rctl |= IXGB_RCTL_SECRC;

      if (adapter->rx_buffer_len <= IXGB_RXBUFFER_2048)
            rctl |= IXGB_RCTL_BSIZE_2048;
      else if (adapter->rx_buffer_len <= IXGB_RXBUFFER_4096)
            rctl |= IXGB_RCTL_BSIZE_4096;
      else if (adapter->rx_buffer_len <= IXGB_RXBUFFER_8192)
            rctl |= IXGB_RCTL_BSIZE_8192;
      else if (adapter->rx_buffer_len <= IXGB_RXBUFFER_16384)
            rctl |= IXGB_RCTL_BSIZE_16384;

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

/**
 * ixgb_configure_rx - Configure 82597 Receive Unit after Reset.
 * @adapter: board private structure
 *
 * Configure the Rx unit of the MAC after a reset.
 **/

static void
ixgb_configure_rx(struct ixgb_adapter *adapter)
{
      uint64_t rdba = adapter->rx_ring.dma;
      uint32_t rdlen = adapter->rx_ring.count * sizeof(struct ixgb_rx_desc);
      struct ixgb_hw *hw = &adapter->hw;
      uint32_t rctl;
      uint32_t rxcsum;
      uint32_t rxdctl;

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

      rctl = IXGB_READ_REG(hw, RCTL);
      IXGB_WRITE_REG(hw, RCTL, rctl & ~IXGB_RCTL_RXEN);

      /* set the Receive Delay Timer Register */

      IXGB_WRITE_REG(hw, RDTR, adapter->rx_int_delay);

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

      IXGB_WRITE_REG(hw, RDBAL, (rdba & 0x00000000ffffffffULL));
      IXGB_WRITE_REG(hw, RDBAH, (rdba >> 32));

      IXGB_WRITE_REG(hw, RDLEN, rdlen);

      /* Setup the HW Rx Head and Tail Descriptor Pointers */
      IXGB_WRITE_REG(hw, RDH, 0);
      IXGB_WRITE_REG(hw, RDT, 0);

      /* set up pre-fetching of receive buffers so we get some before we
       * run out (default hardware behavior is to run out before fetching
       * more).  This sets up to fetch if HTHRESH rx descriptors are avail
       * and the descriptors in hw cache are below PTHRESH.  This avoids
       * the hardware behavior of fetching <=512 descriptors in a single
       * burst that pre-empts all other activity, usually causing fifo
       * overflows. */
      /* use WTHRESH to burst write 16 descriptors or burst when RXT0 */
      rxdctl = RXDCTL_WTHRESH_DEFAULT << IXGB_RXDCTL_WTHRESH_SHIFT |
               RXDCTL_HTHRESH_DEFAULT << IXGB_RXDCTL_HTHRESH_SHIFT |
               RXDCTL_PTHRESH_DEFAULT << IXGB_RXDCTL_PTHRESH_SHIFT;
      IXGB_WRITE_REG(hw, RXDCTL, rxdctl);

      /* Enable Receive Checksum Offload for TCP and UDP */
      if(adapter->rx_csum == TRUE) {
            rxcsum = IXGB_READ_REG(hw, RXCSUM);
            rxcsum |= IXGB_RXCSUM_TUOFL;
            IXGB_WRITE_REG(hw, RXCSUM, rxcsum);
      }

      /* Enable Receives */

      IXGB_WRITE_REG(hw, RCTL, rctl);
}

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

void
ixgb_free_tx_resources(struct ixgb_adapter *adapter)
{
      struct pci_dev *pdev = adapter->pdev;

      ixgb_clean_tx_ring(adapter);

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

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

      adapter->tx_ring.desc = NULL;
}

static void
ixgb_unmap_and_free_tx_resource(struct ixgb_adapter *adapter,
                              struct ixgb_buffer *buffer_info)
{
      struct pci_dev *pdev = adapter->pdev;

      if (buffer_info->dma)
            pci_unmap_page(pdev, buffer_info->dma, buffer_info->length,
                           PCI_DMA_TODEVICE);

      if (buffer_info->skb)
            dev_kfree_skb_any(buffer_info->skb);

      buffer_info->skb = NULL;
      buffer_info->dma = 0;
      buffer_info->time_stamp = 0;
      /* these fields must always be initialized in tx
       * buffer_info->length = 0;
       * buffer_info->next_to_watch = 0; */
}

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

static void
ixgb_clean_tx_ring(struct ixgb_adapter *adapter)
{
      struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
      struct ixgb_buffer *buffer_info;
      unsigned long size;
      unsigned int i;

      /* Free all the Tx ring sk_buffs */

      for(i = 0; i < tx_ring->count; i++) {
            buffer_info = &tx_ring->buffer_info[i];
            ixgb_unmap_and_free_tx_resource(adapter, buffer_info);
      }

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

      /* Zero out the descriptor ring */

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

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

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

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

void
ixgb_free_rx_resources(struct ixgb_adapter *adapter)
{
      struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
      struct pci_dev *pdev = adapter->pdev;

      ixgb_clean_rx_ring(adapter);

      vfree(rx_ring->buffer_info);
      rx_ring->buffer_info = NULL;

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

      rx_ring->desc = NULL;
}

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

static void
ixgb_clean_rx_ring(struct ixgb_adapter *adapter)
{
      struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
      struct ixgb_buffer *buffer_info;
      struct pci_dev *pdev = adapter->pdev;
      unsigned long size;
      unsigned int i;

      /* Free all the Rx ring sk_buffs */

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

                  pci_unmap_single(pdev,
                               buffer_info->dma,
                               buffer_info->length,
                               PCI_DMA_FROMDEVICE);

                  dev_kfree_skb(buffer_info->skb);

                  buffer_info->skb = NULL;
            }
      }

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

      /* Zero out the descriptor ring */

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

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

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

/**
 * ixgb_set_mac - Change the Ethernet Address of the NIC
 * @netdev: network interface device structure
 * @p: pointer to an address structure
 *
 * Returns 0 on success, negative on failure
 **/

static int
ixgb_set_mac(struct net_device *netdev, void *p)
{
      struct ixgb_adapter *adapter = netdev_priv(netdev);
      struct sockaddr *addr = p;

      if(!is_valid_ether_addr(addr->sa_data))
            return -EADDRNOTAVAIL;

      memcpy(netdev->dev_addr, addr->sa_data, netdev->addr_len);

      ixgb_rar_set(&adapter->hw, addr->sa_data, 0);

      return 0;
}

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

static void
ixgb_set_multi(struct net_device *netdev)
{
      struct ixgb_adapter *adapter = netdev_priv(netdev);
      struct ixgb_hw *hw = &adapter->hw;
      struct dev_mc_list *mc_ptr;
      uint32_t rctl;
      int i;

      /* Check for Promiscuous and All Multicast modes */

      rctl = IXGB_READ_REG(hw, RCTL);

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

      if(netdev->mc_count > IXGB_MAX_NUM_MULTICAST_ADDRESSES) {
            rctl |= IXGB_RCTL_MPE;
            IXGB_WRITE_REG(hw, RCTL, rctl);
      } else {
            uint8_t mta[netdev->mc_count * IXGB_ETH_LENGTH_OF_ADDRESS];

            IXGB_WRITE_REG(hw, RCTL, rctl);

            for(i = 0, mc_ptr = netdev->mc_list; mc_ptr;
                  i++, mc_ptr = mc_ptr->next)
                  memcpy(&mta[i * IXGB_ETH_LENGTH_OF_ADDRESS],
                           mc_ptr->dmi_addr, IXGB_ETH_LENGTH_OF_ADDRESS);

            ixgb_mc_addr_list_update(hw, mta, netdev->mc_count, 0);
      }
}

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

static void
ixgb_watchdog(unsigned long data)
{
      struct ixgb_adapter *adapter = (struct ixgb_adapter *)data;
      struct net_device *netdev = adapter->netdev;
      struct ixgb_desc_ring *txdr = &adapter->tx_ring;

      ixgb_check_for_link(&adapter->hw);

      if (ixgb_check_for_bad_link(&adapter->hw)) {
            /* force the reset path */
            netif_stop_queue(netdev);
      }

      if(adapter->hw.link_up) {
            if(!netif_carrier_ok(netdev)) {
                  DPRINTK(LINK, INFO,
                          "NIC Link is Up 10000 Mbps Full Duplex\n");
                  adapter->link_speed = 10000;
                  adapter->link_duplex = FULL_DUPLEX;
                  netif_carrier_on(netdev);
                  netif_wake_queue(netdev);
            }
      } else {
            if(netif_carrier_ok(netdev)) {
                  adapter->link_speed = 0;
                  adapter->link_duplex = 0;
                  DPRINTK(LINK, INFO, "NIC Link is Down\n");
                  netif_carrier_off(netdev);
                  netif_stop_queue(netdev);

            }
      }

      ixgb_update_stats(adapter);

      if(!netif_carrier_ok(netdev)) {
            if(IXGB_DESC_UNUSED(txdr) + 1 < txdr->count) {
                  /* We've lost link, so the controller stops DMA,
                   * but we've got queued Tx work that's never going
                   * to get done, so reset controller to flush Tx.
                   * (Do the reset outside of interrupt context). */
                  schedule_work(&adapter->tx_timeout_task);
            }
      }

      /* Force detection of hung controller every watchdog period */
      adapter->detect_tx_hung = TRUE;

      /* generate an interrupt to force clean up of any stragglers */
      IXGB_WRITE_REG(&adapter->hw, ICS, IXGB_INT_TXDW);

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

#define IXGB_TX_FLAGS_CSUM          0x00000001
#define IXGB_TX_FLAGS_VLAN          0x00000002
#define IXGB_TX_FLAGS_TSO           0x00000004

static int
ixgb_tso(struct ixgb_adapter *adapter, struct sk_buff *skb)
{
#ifdef NETIF_F_TSO
      struct ixgb_context_desc *context_desc;
      unsigned int i;
      uint8_t ipcss, ipcso, tucss, tucso, hdr_len;
      uint16_t ipcse, tucse, mss;
      int err;

      if (likely(skb_is_gso(skb))) {
            if (skb_header_cloned(skb)) {
                  err = pskb_expand_head(skb, 0, 0, GFP_ATOMIC);
                  if (err)
                        return err;
            }

            hdr_len = ((skb->h.raw - skb->data) + (skb->h.th->doff << 2));
            mss = skb_shinfo(skb)->gso_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 = IXGB_CONTEXT_DESC(adapter->tx_ring, i);

            context_desc->ipcss = ipcss;
            context_desc->ipcso = ipcso;
            context_desc->ipcse = cpu_to_le16(ipcse);
            context_desc->tucss = tucss;
            context_desc->tucso = tucso;
            context_desc->tucse = cpu_to_le16(tucse);
            context_desc->mss = cpu_to_le16(mss);
            context_desc->hdr_len = hdr_len;
            context_desc->status = 0;
            context_desc->cmd_type_len = cpu_to_le32(
                                      IXGB_CONTEXT_DESC_TYPE 
                                    | IXGB_CONTEXT_DESC_CMD_TSE
                                    | IXGB_CONTEXT_DESC_CMD_IP
                                    | IXGB_CONTEXT_DESC_CMD_TCP
                                    | IXGB_CONTEXT_DESC_CMD_IDE
                                    | (skb->len - (hdr_len)));


            if(++i == adapter->tx_ring.count) i = 0;
            adapter->tx_ring.next_to_use = i;

            return 1;
      }
#endif

      return 0;
}

static boolean_t
ixgb_tx_csum(struct ixgb_adapter *adapter, struct sk_buff *skb)
{
      struct ixgb_context_desc *context_desc;
      unsigned int i;
      uint8_t css, cso;

      if(likely(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 = IXGB_CONTEXT_DESC(adapter->tx_ring, i);

            context_desc->tucss = css;
            context_desc->tucso = cso;
            context_desc->tucse = 0;
            /* zero out any previously existing data in one instruction */
            *(uint32_t *)&(context_desc->ipcss) = 0;
            context_desc->status = 0;
            context_desc->hdr_len = 0;
            context_desc->mss = 0;
            context_desc->cmd_type_len =
                  cpu_to_le32(IXGB_CONTEXT_DESC_TYPE
                            | IXGB_TX_DESC_CMD_IDE);

            if(++i == adapter->tx_ring.count) i = 0;
            adapter->tx_ring.next_to_use = i;

            return TRUE;
      }

      return FALSE;
}

#define IXGB_MAX_TXD_PWR      14
#define IXGB_MAX_DATA_PER_TXD (1<<IXGB_MAX_TXD_PWR)

static int
ixgb_tx_map(struct ixgb_adapter *adapter, struct sk_buff *skb,
          unsigned int first)
{
      struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
      struct ixgb_buffer *buffer_info;
      int len = skb->len;
      unsigned int offset = 0, size, count = 0, i;

      unsigned int nr_frags = skb_shinfo(skb)->nr_frags;
      unsigned int f;

      len -= skb->data_len;

      i = tx_ring->next_to_use;

      while(len) {
            buffer_info = &tx_ring->buffer_info[i];
            size = min(len, IXGB_MAX_DATA_PER_TXD);
            buffer_info->length = size;
            buffer_info->dma =
                  pci_map_single(adapter->pdev,
                        skb->data + offset,
                        size,
                        PCI_DMA_TODEVICE);
            buffer_info->time_stamp = jiffies;
            buffer_info->next_to_watch = 0;

            len -= size;
            offset += size;
            count++;
            if(++i == tx_ring->count) i = 0;
      }

      for(f = 0; f < nr_frags; f++) {
            struct skb_frag_struct *frag;

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

            while(len) {
                  buffer_info = &tx_ring->buffer_info[i];
                  size = min(len, IXGB_MAX_DATA_PER_TXD);
                  buffer_info->length = size;
                  buffer_info->dma =
                        pci_map_page(adapter->pdev,
                              frag->page,
                              frag->page_offset + offset,
                              size,
                              PCI_DMA_TODEVICE);
                  buffer_info->time_stamp = jiffies;
                  buffer_info->next_to_watch = 0;

                  len -= size;
                  offset += size;
                  count++;
                  if(++i == tx_ring->count) i = 0;
            }
      }
      i = (i == 0) ? tx_ring->count - 1 : i - 1;
      tx_ring->buffer_info[i].skb = skb;
      tx_ring->buffer_info[first].next_to_watch = i;

      return count;
}

static void
ixgb_tx_queue(struct ixgb_adapter *adapter, int count, int vlan_id,int tx_flags)
{
      struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
      struct ixgb_tx_desc *tx_desc = NULL;
      struct ixgb_buffer *buffer_info;
      uint32_t cmd_type_len = adapter->tx_cmd_type;
      uint8_t status = 0;
      uint8_t popts = 0;
      unsigned int i;

      if(tx_flags & IXGB_TX_FLAGS_TSO) {
            cmd_type_len |= IXGB_TX_DESC_CMD_TSE;
            popts |= (IXGB_TX_DESC_POPTS_IXSM | IXGB_TX_DESC_POPTS_TXSM);
      }

      if(tx_flags & IXGB_TX_FLAGS_CSUM)
            popts |= IXGB_TX_DESC_POPTS_TXSM;

      if(tx_flags & IXGB_TX_FLAGS_VLAN) {
            cmd_type_len |= IXGB_TX_DESC_CMD_VLE;
      }

      i = tx_ring->next_to_use;

      while(count--) {
            buffer_info = &tx_ring->buffer_info[i];
            tx_desc = IXGB_TX_DESC(*tx_ring, i);
            tx_desc->buff_addr = cpu_to_le64(buffer_info->dma);
            tx_desc->cmd_type_len =
                  cpu_to_le32(cmd_type_len | buffer_info->length);
            tx_desc->status = status;
            tx_desc->popts = popts;
            tx_desc->vlan = cpu_to_le16(vlan_id);

            if(++i == tx_ring->count) i = 0;
      }

      tx_desc->cmd_type_len |= cpu_to_le32(IXGB_TX_DESC_CMD_EOP 
                        | IXGB_TX_DESC_CMD_RS );

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

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

/* Tx Descriptors needed, worst case */
#define TXD_USE_COUNT(S) (((S) >> IXGB_MAX_TXD_PWR) + \
                   (((S) & (IXGB_MAX_DATA_PER_TXD - 1)) ? 1 : 0))
#define DESC_NEEDED TXD_USE_COUNT(IXGB_MAX_DATA_PER_TXD) + \
      MAX_SKB_FRAGS * TXD_USE_COUNT(PAGE_SIZE) + 1

static int
ixgb_xmit_frame(struct sk_buff *skb, struct net_device *netdev)
{
      struct ixgb_adapter *adapter = netdev_priv(netdev);
      unsigned int first;
      unsigned int tx_flags = 0;
      unsigned long flags;
      int vlan_id = 0;
      int tso;

      if(skb->len <= 0) {
            dev_kfree_skb_any(skb);
            return 0;
      }

#ifdef NETIF_F_LLTX
      local_irq_save(flags);
      if (!spin_trylock(&adapter->tx_lock)) {
            /* Collision - tell upper layer to requeue */
            local_irq_restore(flags);
            return NETDEV_TX_LOCKED;
      }
#else
      spin_lock_irqsave(&adapter->tx_lock, flags);
#endif

      if(unlikely(IXGB_DESC_UNUSED(&adapter->tx_ring) < DESC_NEEDED)) {
            netif_stop_queue(netdev);
            spin_unlock_irqrestore(&adapter->tx_lock, flags);
            return NETDEV_TX_BUSY;
      }

#ifndef NETIF_F_LLTX
      spin_unlock_irqrestore(&adapter->tx_lock, flags);
#endif

      if(adapter->vlgrp && vlan_tx_tag_present(skb)) {
            tx_flags |= IXGB_TX_FLAGS_VLAN;
            vlan_id = vlan_tx_tag_get(skb);
      }

      first = adapter->tx_ring.next_to_use;
      
      tso = ixgb_tso(adapter, skb);
      if (tso < 0) {
            dev_kfree_skb_any(skb);
#ifdef NETIF_F_LLTX
            spin_unlock_irqrestore(&adapter->tx_lock, flags);
#endif
            return NETDEV_TX_OK;
      }

      if (likely(tso))
            tx_flags |= IXGB_TX_FLAGS_TSO;
      else if(ixgb_tx_csum(adapter, skb))
            tx_flags |= IXGB_TX_FLAGS_CSUM;

      ixgb_tx_queue(adapter, ixgb_tx_map(adapter, skb, first), vlan_id,
                  tx_flags);

      netdev->trans_start = jiffies;

#ifdef NETIF_F_LLTX
      /* Make sure there is space in the ring for the next send. */
      if(unlikely(IXGB_DESC_UNUSED(&adapter->tx_ring) < DESC_NEEDED))
            netif_stop_queue(netdev);

      spin_unlock_irqrestore(&adapter->tx_lock, flags);

#endif
      return NETDEV_TX_OK;
}

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

static void
ixgb_tx_timeout(struct net_device *netdev)
{
      struct ixgb_adapter *adapter = netdev_priv(netdev);

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

static void
ixgb_tx_timeout_task(struct net_device *netdev)
{
      struct ixgb_adapter *adapter = netdev_priv(netdev);

      adapter->tx_timeout_count++;
      ixgb_down(adapter, TRUE);
      ixgb_up(adapter);
}

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

static struct net_device_stats *
ixgb_get_stats(struct net_device *netdev)
{
      struct ixgb_adapter *adapter = netdev_priv(netdev);

      return &adapter->net_stats;
}

/**
 * ixgb_change_mtu - Change the Maximum Transfer Unit
 * @netdev: network interface device structure
 * @new_mtu: new value for maximum frame size
 *
 * Returns 0 on success, negative on failure
 **/

static int
ixgb_change_mtu(struct net_device *netdev, int new_mtu)
{
      struct ixgb_adapter *adapter = netdev_priv(netdev);
      int max_frame = new_mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;
      int old_max_frame = netdev->mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;


      if((max_frame < IXGB_MIN_ENET_FRAME_SIZE_WITHOUT_FCS + ENET_FCS_LENGTH)
         || (max_frame > IXGB_MAX_JUMBO_FRAME_SIZE + ENET_FCS_LENGTH)) {
            DPRINTK(PROBE, ERR, "Invalid MTU setting %d\n", new_mtu);
            return -EINVAL;
      }

      adapter->rx_buffer_len = max_frame;

      netdev->mtu = new_mtu;

      if ((old_max_frame != max_frame) && netif_running(netdev)) {
            ixgb_down(adapter, TRUE);
            ixgb_up(adapter);
      }

      return 0;
}

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

void
ixgb_update_stats(struct ixgb_adapter *adapter)
{
      struct net_device *netdev = adapter->netdev;

      if((netdev->flags & IFF_PROMISC) || (netdev->flags & IFF_ALLMULTI) ||
         (netdev->mc_count > IXGB_MAX_NUM_MULTICAST_ADDRESSES)) {
            u64 multi = IXGB_READ_REG(&adapter->hw, MPRCL);
            u32 bcast_l = IXGB_READ_REG(&adapter->hw, BPRCL);
            u32 bcast_h = IXGB_READ_REG(&adapter->hw, BPRCH);
            u64 bcast = ((u64)bcast_h << 32) | bcast_l; 

            multi |= ((u64)IXGB_READ_REG(&adapter->hw, MPRCH) << 32);
            /* fix up multicast stats by removing broadcasts */
            if(multi >= bcast)
                  multi -= bcast;
            
            adapter->stats.mprcl += (multi & 0xFFFFFFFF);
            adapter->stats.mprch += (multi >> 32);
            adapter->stats.bprcl += bcast_l; 
            adapter->stats.bprch += bcast_h;
      } else {
            adapter->stats.mprcl += IXGB_READ_REG(&adapter->hw, MPRCL);
            adapter->stats.mprch += IXGB_READ_REG(&adapter->hw, MPRCH);
            adapter->stats.bprcl += IXGB_READ_REG(&adapter->hw, BPRCL);
            adapter->stats.bprch += IXGB_READ_REG(&adapter->hw, BPRCH);
      }
      adapter->stats.tprl += IXGB_READ_REG(&adapter->hw, TPRL);
      adapter->stats.tprh += IXGB_READ_REG(&adapter->hw, TPRH);
      adapter->stats.gprcl += IXGB_READ_REG(&adapter->hw, GPRCL);
      adapter->stats.gprch += IXGB_READ_REG(&adapter->hw, GPRCH);
      adapter->stats.uprcl += IXGB_READ_REG(&adapter->hw, UPRCL);
      adapter->stats.uprch += IXGB_READ_REG(&adapter->hw, UPRCH);
      adapter->stats.vprcl += IXGB_READ_REG(&adapter->hw, VPRCL);
      adapter->stats.vprch += IXGB_READ_REG(&adapter->hw, VPRCH);
      adapter->stats.jprcl += IXGB_READ_REG(&adapter->hw, JPRCL);
      adapter->stats.jprch += IXGB_READ_REG(&adapter->hw, JPRCH);
      adapter->stats.gorcl += IXGB_READ_REG(&adapter->hw, GORCL);
      adapter->stats.gorch += IXGB_READ_REG(&adapter->hw, GORCH);
      adapter->stats.torl += IXGB_READ_REG(&adapter->hw, TORL);
      adapter->stats.torh += IXGB_READ_REG(&adapter->hw, TORH);
      adapter->stats.rnbc += IXGB_READ_REG(&adapter->hw, RNBC);
      adapter->stats.ruc += IXGB_READ_REG(&adapter->hw, RUC);
      adapter->stats.roc += IXGB_READ_REG(&adapter->hw, ROC);
      adapter->stats.rlec += IXGB_READ_REG(&adapter->hw, RLEC);
      adapter->stats.crcerrs += IXGB_READ_REG(&adapter->hw, CRCERRS);
      adapter->stats.icbc += IXGB_READ_REG(&adapter->hw, ICBC);
      adapter->stats.ecbc += IXGB_READ_REG(&adapter->hw, ECBC);
      adapter->stats.mpc += IXGB_READ_REG(&adapter->hw, MPC);
      adapter->stats.tptl += IXGB_READ_REG(&adapter->hw, TPTL);
      adapter->stats.tpth += IXGB_READ_REG(&adapter->hw, TPTH);
      adapter->stats.gptcl += IXGB_READ_REG(&adapter->hw, GPTCL);
      adapter->stats.gptch += IXGB_READ_REG(&adapter->hw, GPTCH);
      adapter->stats.bptcl += IXGB_READ_REG(&adapter->hw, BPTCL);
      adapter->stats.bptch += IXGB_READ_REG(&adapter->hw, BPTCH);
      adapter->stats.mptcl += IXGB_READ_REG(&adapter->hw, MPTCL);
      adapter->stats.mptch += IXGB_READ_REG(&adapter->hw, MPTCH);
      adapter->stats.uptcl += IXGB_READ_REG(&adapter->hw, UPTCL);
      adapter->stats.uptch += IXGB_READ_REG(&adapter->hw, UPTCH);
      adapter->stats.vptcl += IXGB_READ_REG(&adapter->hw, VPTCL);
      adapter->stats.vptch += IXGB_READ_REG(&adapter->hw, VPTCH);
      adapter->stats.jptcl += IXGB_READ_REG(&adapter->hw, JPTCL);
      adapter->stats.jptch += IXGB_READ_REG(&adapter->hw, JPTCH);
      adapter->stats.gotcl += IXGB_READ_REG(&adapter->hw, GOTCL);
      adapter->stats.gotch += IXGB_READ_REG(&adapter->hw, GOTCH);
      adapter->stats.totl += IXGB_READ_REG(&adapter->hw, TOTL);
      adapter->stats.toth += IXGB_READ_REG(&adapter->hw, TOTH);
      adapter->stats.dc += IXGB_READ_REG(&adapter->hw, DC);
      adapter->stats.plt64c += IXGB_READ_REG(&adapter->hw, PLT64C);
      adapter->stats.tsctc += IXGB_READ_REG(&adapter->hw, TSCTC);
      adapter->stats.tsctfc += IXGB_READ_REG(&adapter->hw, TSCTFC);
      adapter->stats.ibic += IXGB_READ_REG(&adapter->hw, IBIC);
      adapter->stats.rfc += IXGB_READ_REG(&adapter->hw, RFC);
      adapter->stats.lfc += IXGB_READ_REG(&adapter->hw, LFC);
      adapter->stats.pfrc += IXGB_READ_REG(&adapter->hw, PFRC);
      adapter->stats.pftc += IXGB_READ_REG(&adapter->hw, PFTC);
      adapter->stats.mcfrc += IXGB_READ_REG(&adapter->hw, MCFRC);
      adapter->stats.mcftc += IXGB_READ_REG(&adapter->hw, MCFTC);
      adapter->stats.xonrxc += IXGB_READ_REG(&adapter->hw, XONRXC);
      adapter->stats.xontxc += IXGB_READ_REG(&adapter->hw, XONTXC);
      adapter->stats.xoffrxc += IXGB_READ_REG(&adapter->hw, XOFFRXC);
      adapter->stats.xofftxc += IXGB_READ_REG(&adapter->hw, XOFFTXC);
      adapter->stats.rjc += IXGB_READ_REG(&adapter->hw, RJC);

      /* Fill out the OS statistics structure */

      adapter->net_stats.rx_packets = adapter->stats.gprcl;
      adapter->net_stats.tx_packets = adapter->stats.gptcl;
      adapter->net_stats.rx_bytes = adapter->stats.gorcl;
      adapter->net_stats.tx_bytes = adapter->stats.gotcl;
      adapter->net_stats.multicast = adapter->stats.mprcl;
      adapter->net_stats.collisions = 0;

      /* ignore RLEC as it reports errors for padded (<64bytes) frames
       * with a length in the type/len field */
      adapter->net_stats.rx_errors =
          /* adapter->stats.rnbc + */ adapter->stats.crcerrs +
          adapter->stats.ruc +
          adapter->stats.roc /*+ adapter->stats.rlec */  +
          adapter->stats.icbc +
          adapter->stats.ecbc + adapter->stats.mpc;

      /* see above
       * adapter->net_stats.rx_length_errors = adapter->stats.rlec;
       */

      adapter->net_stats.rx_crc_errors = adapter->stats.crcerrs;
      adapter->net_stats.rx_fifo_errors = adapter->stats.mpc;
      adapter->net_stats.rx_missed_errors = adapter->stats.mpc;
      adapter->net_stats.rx_over_errors = adapter->stats.mpc;

      adapter->net_stats.tx_errors = 0;
      adapter->net_stats.rx_frame_errors = 0;
      adapter->net_stats.tx_aborted_errors = 0;
      adapter->net_stats.tx_carrier_errors = 0;
      adapter->net_stats.tx_fifo_errors = 0;
      adapter->net_stats.tx_heartbeat_errors = 0;
      adapter->net_stats.tx_window_errors = 0;
}

#define IXGB_MAX_INTR 10
/**
 * ixgb_intr - Interrupt Handler
 * @irq: interrupt number
 * @data: pointer to a network interface device structure
 * @pt_regs: CPU registers structure
 **/

static irqreturn_t
ixgb_intr(int irq, void *data, struct pt_regs *regs)
{
      struct net_device *netdev = data;
      struct ixgb_adapter *adapter = netdev_priv(netdev);
      struct ixgb_hw *hw = &adapter->hw;
      uint32_t icr = IXGB_READ_REG(hw, ICR);
#ifndef CONFIG_IXGB_NAPI
      unsigned int i;
#endif

      if(unlikely(!icr))
            return IRQ_NONE;  /* Not our interrupt */

      if(unlikely(icr & (IXGB_INT_RXSEQ | IXGB_INT_LSC))) {
            mod_timer(&adapter->watchdog_timer, jiffies);
      }

#ifdef CONFIG_IXGB_NAPI
      if(netif_rx_schedule_prep(netdev)) {

            /* Disable interrupts and register for poll. The flush 
              of the posted write is intentionally left out.
            */

            atomic_inc(&adapter->irq_sem);
            IXGB_WRITE_REG(&adapter->hw, IMC, ~0);
            __netif_rx_schedule(netdev);
      }
#else
      /* yes, that is actually a & and it is meant to make sure that
       * every pass through this for loop checks both receive and
       * transmit queues for completed descriptors, intended to
       * avoid starvation issues and assist tx/rx fairness. */
      for(i = 0; i < IXGB_MAX_INTR; i++)
            if(!ixgb_clean_rx_irq(adapter) &
               !ixgb_clean_tx_irq(adapter))
                  break;
#endif 
      return IRQ_HANDLED;
}

#ifdef CONFIG_IXGB_NAPI
/**
 * ixgb_clean - NAPI Rx polling callback
 * @adapter: board private structure
 **/

static int
ixgb_clean(struct net_device *netdev, int *budget)
{
      struct ixgb_adapter *adapter = netdev_priv(netdev);
      int work_to_do = min(*budget, netdev->quota);
      int tx_cleaned;
      int work_done = 0;

      tx_cleaned = ixgb_clean_tx_irq(adapter);
      ixgb_clean_rx_irq(adapter, &work_done, work_to_do);

      *budget -= work_done;
      netdev->quota -= work_done;

      /* if no Tx and not enough Rx work done, exit the polling mode */
      if((!tx_cleaned && (work_done == 0)) || !netif_running(netdev)) {
            netif_rx_complete(netdev);
            ixgb_irq_enable(adapter);
            return 0;
      }

      return 1;
}
#endif

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

static boolean_t
ixgb_clean_tx_irq(struct ixgb_adapter *adapter)
{
      struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
      struct net_device *netdev = adapter->netdev;
      struct ixgb_tx_desc *tx_desc, *eop_desc;
      struct ixgb_buffer *buffer_info;
      unsigned int i, eop;
      boolean_t cleaned = FALSE;

      i = tx_ring->next_to_clean;
      eop = tx_ring->buffer_info[i].next_to_watch;
      eop_desc = IXGB_TX_DESC(*tx_ring, eop);

      while(eop_desc->status & IXGB_TX_DESC_STATUS_DD) {

            for(cleaned = FALSE; !cleaned; ) {
                  tx_desc = IXGB_TX_DESC(*tx_ring, i);
                  buffer_info = &tx_ring->buffer_info[i];

                  if (tx_desc->popts
                      & (IXGB_TX_DESC_POPTS_TXSM |
                         IXGB_TX_DESC_POPTS_IXSM))
                        adapter->hw_csum_tx_good++;

                  ixgb_unmap_and_free_tx_resource(adapter, buffer_info);

                  *(uint32_t *)&(tx_desc->status) = 0;

                  cleaned = (i == eop);
                  if(++i == tx_ring->count) i = 0;
            }

            eop = tx_ring->buffer_info[i].next_to_watch;
            eop_desc = IXGB_TX_DESC(*tx_ring, eop);
      }

      tx_ring->next_to_clean = i;

      if (unlikely(netif_queue_stopped(netdev))) {
            spin_lock(&adapter->tx_lock);
            if (netif_queue_stopped(netdev) && netif_carrier_ok(netdev) &&
                (IXGB_DESC_UNUSED(tx_ring) > IXGB_TX_QUEUE_WAKE))
                  netif_wake_queue(netdev);
            spin_unlock(&adapter->tx_lock);
      }

      if(adapter->detect_tx_hung) {
            /* detect a transmit hang in hardware, this serializes the
             * check with the clearing of time_stamp and movement of i */
            adapter->detect_tx_hung = FALSE;
            if (tx_ring->buffer_info[eop].dma &&
               time_after(jiffies, tx_ring->buffer_info[eop].time_stamp + HZ)
               && !(IXGB_READ_REG(&adapter->hw, STATUS) &
                    IXGB_STATUS_TXOFF)) {
                  /* detected Tx unit hang */
                  DPRINTK(DRV, ERR, "Detected Tx Unit Hang\n"
                              "  TDH                  <%x>\n"
                              "  TDT                  <%x>\n"
                              "  next_to_use          <%x>\n"
                              "  next_to_clean        <%x>\n"
                              "buffer_info[next_to_clean]\n"
                              "  time_stamp           <%lx>\n"
                              "  next_to_watch        <%x>\n"
                              "  jiffies              <%lx>\n"
                              "  next_to_watch.status <%x>\n",
                        IXGB_READ_REG(&adapter->hw, TDH),
                        IXGB_READ_REG(&adapter->hw, TDT),
                        tx_ring->next_to_use,
                        tx_ring->next_to_clean,
                        tx_ring->buffer_info[eop].time_stamp,
                        eop,
                        jiffies,
                        eop_desc->status);
                  netif_stop_queue(netdev);
            }
      }

      return cleaned;
}

/**
 * ixgb_rx_checksum - Receive Checksum Offload for 82597.
 * @adapter: board private structure
 * @rx_desc: receive descriptor
 * @sk_buff: socket buffer with received data
 **/

static void
ixgb_rx_checksum(struct ixgb_adapter *adapter,
             struct ixgb_rx_desc *rx_desc,
             struct sk_buff *skb)
{
      /* Ignore Checksum bit is set OR
       * TCP Checksum has not been calculated
       */
      if((rx_desc->status & IXGB_RX_DESC_STATUS_IXSM) ||
         (!(rx_desc->status & IXGB_RX_DESC_STATUS_TCPCS))) {
            skb->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 & IXGB_RX_DESC_ERRORS_TCPE) {
            /* let the stack verify checksum errors */
            skb->ip_summed = CHECKSUM_NONE;
            adapter->hw_csum_rx_error++;
      } else {
            /* TCP checksum is good */
            skb->ip_summed = CHECKSUM_UNNECESSARY;
            adapter->hw_csum_rx_good++;
      }
}

/**
 * ixgb_clean_rx_irq - Send received data up the network stack,
 * @adapter: board private structure
 **/

static boolean_t
#ifdef CONFIG_IXGB_NAPI
ixgb_clean_rx_irq(struct ixgb_adapter *adapter, int *work_done, int work_to_do)
#else
ixgb_clean_rx_irq(struct ixgb_adapter *adapter)
#endif
{
      struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
      struct net_device *netdev = adapter->netdev;
      struct pci_dev *pdev = adapter->pdev;
      struct ixgb_rx_desc *rx_desc, *next_rxd;
      struct ixgb_buffer *buffer_info, *next_buffer, *next2_buffer;
      uint32_t length;
      unsigned int i, j;
      boolean_t cleaned = FALSE;

      i = rx_ring->next_to_clean;
      rx_desc = IXGB_RX_DESC(*rx_ring, i);
      buffer_info = &rx_ring->buffer_info[i];

      while(rx_desc->status & IXGB_RX_DESC_STATUS_DD) {
            struct sk_buff *skb, *next_skb;
            u8 status;

#ifdef CONFIG_IXGB_NAPI
            if(*work_done >= work_to_do)
                  break;

            (*work_done)++;
#endif
            status = rx_desc->status;
            skb = buffer_info->skb;
            buffer_info->skb = NULL;

            prefetch(skb->data);

            if(++i == rx_ring->count) i = 0;
            next_rxd = IXGB_RX_DESC(*rx_ring, i);
            prefetch(next_rxd);

            if((j = i + 1) == rx_ring->count) j = 0;
            next2_buffer = &rx_ring->buffer_info[j];
            prefetch(next2_buffer);

            next_buffer = &rx_ring->buffer_info[i];
            next_skb = next_buffer->skb;
            prefetch(next_skb);

            cleaned = TRUE;

            pci_unmap_single(pdev,
                         buffer_info->dma,
                         buffer_info->length,
                         PCI_DMA_FROMDEVICE);

            length = le16_to_cpu(rx_desc->length);

            if(unlikely(!(status & IXGB_RX_DESC_STATUS_EOP))) {

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

                  IXGB_DBG("Receive packet consumed multiple buffers "
                               "length<%x>\n", length);

                  dev_kfree_skb_irq(skb);
                  goto rxdesc_done;
            }

            if (unlikely(rx_desc->errors
                       & (IXGB_RX_DESC_ERRORS_CE | IXGB_RX_DESC_ERRORS_SE
                        | IXGB_RX_DESC_ERRORS_P |
                        IXGB_RX_DESC_ERRORS_RXE))) {

                  dev_kfree_skb_irq(skb);
                  goto rxdesc_done;
            }

            /* code added for copybreak, this should improve
             * performance for small packets with large amounts
             * of reassembly being done in the stack */
#define IXGB_CB_LENGTH 256
            if (length < IXGB_CB_LENGTH) {
                  struct sk_buff *new_skb =
                      dev_alloc_skb(length + NET_IP_ALIGN);
                  if (new_skb) {
                        skb_reserve(new_skb, NET_IP_ALIGN);
                        new_skb->dev = netdev;
                        memcpy(new_skb->data - NET_IP_ALIGN,
                               skb->data - NET_IP_ALIGN,
                               length + NET_IP_ALIGN);
                        /* save the skb in buffer_info as good */
                        buffer_info->skb = skb;
                        skb = new_skb;
                  }
            }
            /* end copybreak code */

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

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

            skb->protocol = eth_type_trans(skb, netdev);
#ifdef CONFIG_IXGB_NAPI
            if(adapter->vlgrp && (status & IXGB_RX_DESC_STATUS_VP)) {
                  vlan_hwaccel_receive_skb(skb, adapter->vlgrp,
                        le16_to_cpu(rx_desc->special) &
                              IXGB_RX_DESC_SPECIAL_VLAN_MASK);
            } else {
                  netif_receive_skb(skb);
            }
#else /* CONFIG_IXGB_NAPI */
            if(adapter->vlgrp && (status & IXGB_RX_DESC_STATUS_VP)) {
                  vlan_hwaccel_rx(skb, adapter->vlgrp,
                        le16_to_cpu(rx_desc->special) &
                              IXGB_RX_DESC_SPECIAL_VLAN_MASK);
            } else {
                  netif_rx(skb);
            }
#endif /* CONFIG_IXGB_NAPI */
            netdev->last_rx = jiffies;

rxdesc_done:
            /* clean up descriptor, might be written over by hw */
            rx_desc->status = 0;

            /* use prefetched values */
            rx_desc = next_rxd;
            buffer_info = next_buffer;
      }

      rx_ring->next_to_clean = i;

      ixgb_alloc_rx_buffers(adapter);

      return cleaned;
}

/**
 * ixgb_alloc_rx_buffers - Replace used receive buffers
 * @adapter: address of board private structure
 **/

static void
ixgb_alloc_rx_buffers(struct ixgb_adapter *adapter)
{
      struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
      struct net_device *netdev = adapter->netdev;
      struct pci_dev *pdev = adapter->pdev;
      struct ixgb_rx_desc *rx_desc;
      struct ixgb_buffer *buffer_info;
      struct sk_buff *skb;
      unsigned int i;
      int num_group_tail_writes;
      long cleancount;

      i = rx_ring->next_to_use;
      buffer_info = &rx_ring->buffer_info[i];
      cleancount = IXGB_DESC_UNUSED(rx_ring);

      num_group_tail_writes = IXGB_RX_BUFFER_WRITE;

      /* leave three descriptors unused */
      while(--cleancount > 2) {
            /* recycle! its good for you */
            if (!(skb = buffer_info->skb))
                  skb = dev_alloc_skb(adapter->rx_buffer_len
                                      + NET_IP_ALIGN);
            else {
                  skb_trim(skb, 0);
                  goto map_skb;
            }

            if (unlikely(!skb)) {
                  /* Better luck next round */
                  adapter->alloc_rx_buff_failed++;
                  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, NET_IP_ALIGN);

            skb->dev = netdev;

            buffer_info->skb = skb;
            buffer_info->length = adapter->rx_buffer_len;
map_skb:
            buffer_info->dma = pci_map_single(pdev,
                                              skb->data,
                                              adapter->rx_buffer_len,
                                              PCI_DMA_FROMDEVICE);

            rx_desc = IXGB_RX_DESC(*rx_ring, i);
            rx_desc->buff_addr = cpu_to_le64(buffer_info->dma);
            /* guarantee DD bit not set now before h/w gets descriptor
             * this is the rest of the workaround for h/w double 
             * writeback. */
            rx_desc->status = 0;


            if(++i == rx_ring->count) i = 0;
            buffer_info = &rx_ring->buffer_info[i];
      }

      if (likely(rx_ring->next_to_use != i)) {
            rx_ring->next_to_use = i;
            if (unlikely(i-- == 0))
                  i = (rx_ring->count - 1);

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

/**
 * ixgb_vlan_rx_register - enables or disables vlan tagging/stripping.
 * 
 * @param netdev network interface device structure
 * @param grp indicates to enable or disable tagging/stripping
 **/
static void
ixgb_vlan_rx_register(struct net_device *netdev, struct vlan_group *grp)
{
      struct ixgb_adapter *adapter = netdev_priv(netdev);
      uint32_t ctrl, rctl;

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

      if(grp) {
            /* enable VLAN tag insert/strip */
            ctrl = IXGB_READ_REG(&adapter->hw, CTRL0);
            ctrl |= IXGB_CTRL0_VME;
            IXGB_WRITE_REG(&adapter->hw, CTRL0, ctrl);

            /* enable VLAN receive filtering */

            rctl = IXGB_READ_REG(&adapter->hw, RCTL);
            rctl |= IXGB_RCTL_VFE;
            rctl &= ~IXGB_RCTL_CFIEN;
            IXGB_WRITE_REG(&adapter->hw, RCTL, rctl);
      } else {
            /* disable VLAN tag insert/strip */

            ctrl = IXGB_READ_REG(&adapter->hw, CTRL0);
            ctrl &= ~IXGB_CTRL0_VME;
            IXGB_WRITE_REG(&adapter->hw, CTRL0, ctrl);

            /* disable VLAN filtering */

            rctl = IXGB_READ_REG(&adapter->hw, RCTL);
            rctl &= ~IXGB_RCTL_VFE;
            IXGB_WRITE_REG(&adapter->hw, RCTL, rctl);
      }

      ixgb_irq_enable(adapter);
}

static void
ixgb_vlan_rx_add_vid(struct net_device *netdev, uint16_t vid)
{
      struct ixgb_adapter *adapter = netdev_priv(netdev);
      uint32_t vfta, index;

      /* add VID to filter table */

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

static void
ixgb_vlan_rx_kill_vid(struct net_device *netdev, uint16_t vid)
{
      struct ixgb_adapter *adapter = netdev_priv(netdev);
      uint32_t vfta, index;

      ixgb_irq_disable(adapter);

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

      ixgb_irq_enable(adapter);

      /* remove VID from filter table*/

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

static void
ixgb_restore_vlan(struct ixgb_adapter *adapter)
{
      ixgb_vlan_rx_register(adapter->netdev, adapter->vlgrp);

      if(adapter->vlgrp) {
            uint16_t vid;
            for(vid = 0; vid < VLAN_GROUP_ARRAY_LEN; vid++) {
                  if(!adapter->vlgrp->vlan_devices[vid])
                        continue;
                  ixgb_vlan_rx_add_vid(adapter->netdev, vid);
            }
      }
}

#ifdef CONFIG_NET_POLL_CONTROLLER
/*
 * Polling 'interrupt' - used by things like netconsole to send skbs
 * without having to re-enable interrupts. It's not called while
 * the interrupt routine is executing.
 */

static void ixgb_netpoll(struct net_device *dev)
{
      struct ixgb_adapter *adapter = dev->priv;

      disable_irq(adapter->pdev->irq);
      ixgb_intr(adapter->pdev->irq, dev, NULL);
      enable_irq(adapter->pdev->irq);
}
#endif

/* ixgb_main.c */

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