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netxen_nic_main.c

/*
 * Copyright (C) 2003 - 2006 NetXen, Inc.
 * 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:
 *    info@netxen.com
 * NetXen,
 * 3965 Freedom Circle, Fourth floor,
 * Santa Clara, CA 95054
 *
 *
 *  Main source file for NetXen NIC Driver on Linux
 *
 */

#include <linux/vmalloc.h>
#include <linux/highmem.h>
#include "netxen_nic_hw.h"

#include "netxen_nic.h"
#include "netxen_nic_phan_reg.h"

#include <linux/dma-mapping.h>
#include <net/ip.h>

MODULE_DESCRIPTION("NetXen Multi port (1/10) Gigabit Network Driver");
MODULE_LICENSE("GPL");
MODULE_VERSION(NETXEN_NIC_LINUX_VERSIONID);

char netxen_nic_driver_name[] = "netxen_nic";
static char netxen_nic_driver_string[] = "NetXen Network Driver version "
    NETXEN_NIC_LINUX_VERSIONID;

#define NETXEN_NETDEV_WEIGHT 120
#define NETXEN_ADAPTER_UP_MAGIC 777
#define NETXEN_NIC_PEG_TUNE 0

/* Local functions to NetXen NIC driver */
static int __devinit netxen_nic_probe(struct pci_dev *pdev,
                              const struct pci_device_id *ent);
static void __devexit netxen_nic_remove(struct pci_dev *pdev);
static int netxen_nic_open(struct net_device *netdev);
static int netxen_nic_close(struct net_device *netdev);
static int netxen_nic_xmit_frame(struct sk_buff *, struct net_device *);
static void netxen_tx_timeout(struct net_device *netdev);
static void netxen_tx_timeout_task(struct work_struct *work);
static void netxen_watchdog(unsigned long);
static int netxen_handle_int(struct netxen_adapter *, struct net_device *);
static int netxen_nic_poll(struct napi_struct *napi, int budget);
#ifdef CONFIG_NET_POLL_CONTROLLER
static void netxen_nic_poll_controller(struct net_device *netdev);
#endif
static irqreturn_t netxen_intr(int irq, void *data);

int physical_port[] = {0, 1, 2, 3};

/*  PCI Device ID Table  */
static struct pci_device_id netxen_pci_tbl[] __devinitdata = {
      {PCI_DEVICE(0x4040, 0x0001)},
      {PCI_DEVICE(0x4040, 0x0002)},
      {PCI_DEVICE(0x4040, 0x0003)},
      {PCI_DEVICE(0x4040, 0x0004)},
      {PCI_DEVICE(0x4040, 0x0005)},
      {PCI_DEVICE(0x4040, 0x0024)},
      {PCI_DEVICE(0x4040, 0x0025)},
      {0,}
};

MODULE_DEVICE_TABLE(pci, netxen_pci_tbl);

struct workqueue_struct *netxen_workq;
static void netxen_watchdog(unsigned long);

static inline void netxen_nic_update_cmd_producer(struct netxen_adapter *adapter,
                                          uint32_t crb_producer)
{
      switch (adapter->portnum) {
            case 0:
                  writel(crb_producer, NETXEN_CRB_NORMALIZE
                              (adapter, CRB_CMD_PRODUCER_OFFSET));
                  return;
            case 1:
                  writel(crb_producer, NETXEN_CRB_NORMALIZE
                              (adapter, CRB_CMD_PRODUCER_OFFSET_1));
                  return;
            case 2:
                  writel(crb_producer, NETXEN_CRB_NORMALIZE
                              (adapter, CRB_CMD_PRODUCER_OFFSET_2));
                  return;
            case 3:
                  writel(crb_producer, NETXEN_CRB_NORMALIZE
                              (adapter, CRB_CMD_PRODUCER_OFFSET_3));
                  return;
            default:
                  printk(KERN_WARNING "We tried to update "
                              "CRB_CMD_PRODUCER_OFFSET for invalid "
                              "PCI function id %d\n",
                              adapter->portnum);
                  return;
      }
}

static inline void netxen_nic_update_cmd_consumer(struct netxen_adapter *adapter,
                                          u32 crb_consumer)
{
      switch (adapter->portnum) {
            case 0:
                  writel(crb_consumer, NETXEN_CRB_NORMALIZE
                        (adapter, CRB_CMD_CONSUMER_OFFSET));
                  return;
            case 1:
                  writel(crb_consumer, NETXEN_CRB_NORMALIZE
                        (adapter, CRB_CMD_CONSUMER_OFFSET_1));
                  return;
            case 2:
                  writel(crb_consumer, NETXEN_CRB_NORMALIZE
                        (adapter, CRB_CMD_CONSUMER_OFFSET_2));
                  return;
            case 3:
                  writel(crb_consumer, NETXEN_CRB_NORMALIZE
                        (adapter, CRB_CMD_CONSUMER_OFFSET_3));
                  return;
            default:
                  printk(KERN_WARNING "We tried to update "
                              "CRB_CMD_PRODUCER_OFFSET for invalid "
                              "PCI function id %d\n",
                              adapter->portnum);
                  return;
      }
}

#define     ADAPTER_LIST_SIZE 12
int netxen_cards_found;

static void netxen_nic_disable_int(struct netxen_adapter *adapter)
{
      uint32_t    mask = 0x7ff;
      int retries = 32;

      DPRINTK(1, INFO, "Entered ISR Disable \n");

      switch (adapter->portnum) {
      case 0:
            writel(0x0, NETXEN_CRB_NORMALIZE(adapter, CRB_SW_INT_MASK_0));
            break;
      case 1:
            writel(0x0, NETXEN_CRB_NORMALIZE(adapter, CRB_SW_INT_MASK_1));
            break;
      case 2:
            writel(0x0, NETXEN_CRB_NORMALIZE(adapter, CRB_SW_INT_MASK_2));
            break;
      case 3:
            writel(0x0, NETXEN_CRB_NORMALIZE(adapter, CRB_SW_INT_MASK_3));
            break;
      }

      if (adapter->intr_scheme != -1 &&
          adapter->intr_scheme != INTR_SCHEME_PERPORT)
            writel(mask,PCI_OFFSET_SECOND_RANGE(adapter, ISR_INT_MASK));

      /* Window = 0 or 1 */
      if (!(adapter->flags & NETXEN_NIC_MSI_ENABLED)) {
            do {
                  writel(0xffffffff,
                         PCI_OFFSET_SECOND_RANGE(adapter, ISR_INT_TARGET_STATUS));
                  mask = readl(pci_base_offset(adapter, ISR_INT_VECTOR));
                  if (!(mask & 0x80))
                        break;
                  udelay(10);
            } while (--retries);

            if (!retries) {
                  printk(KERN_NOTICE "%s: Failed to disable interrupt completely\n",
                              netxen_nic_driver_name);
            }
      }

      DPRINTK(1, INFO, "Done with Disable Int\n");
}

static void netxen_nic_enable_int(struct netxen_adapter *adapter)
{
      u32 mask;

      DPRINTK(1, INFO, "Entered ISR Enable \n");

      if (adapter->intr_scheme != -1 &&
            adapter->intr_scheme != INTR_SCHEME_PERPORT) {
            switch (adapter->ahw.board_type) {
            case NETXEN_NIC_GBE:
                  mask  =  0x77b;
                  break;
            case NETXEN_NIC_XGBE:
                  mask  =  0x77f;
                  break;
            default:
                  mask  =  0x7ff;
                  break;
            }

            writel(mask, PCI_OFFSET_SECOND_RANGE(adapter, ISR_INT_MASK));
      }

      switch (adapter->portnum) {
      case 0:
            writel(0x1, NETXEN_CRB_NORMALIZE(adapter, CRB_SW_INT_MASK_0));
            break;
      case 1:
            writel(0x1, NETXEN_CRB_NORMALIZE(adapter, CRB_SW_INT_MASK_1));
            break;
      case 2:
            writel(0x1, NETXEN_CRB_NORMALIZE(adapter, CRB_SW_INT_MASK_2));
            break;
      case 3:
            writel(0x1, NETXEN_CRB_NORMALIZE(adapter, CRB_SW_INT_MASK_3));
            break;
      }

      if (!(adapter->flags & NETXEN_NIC_MSI_ENABLED)) {
            mask = 0xbff;
            if (adapter->intr_scheme != -1 &&
                  adapter->intr_scheme != INTR_SCHEME_PERPORT) {
                  writel(0X0, NETXEN_CRB_NORMALIZE(adapter, CRB_INT_VECTOR));
            }
            writel(mask,
                   PCI_OFFSET_SECOND_RANGE(adapter, ISR_INT_TARGET_MASK));
      }

      DPRINTK(1, INFO, "Done with enable Int\n");
}

/*
 * netxen_nic_probe()
 *
 * The Linux system will invoke this after identifying the vendor ID and
 * device Id in the pci_tbl supported by this module.
 *
 * A quad port card has one operational PCI config space, (function 0),
 * which is used to access all four ports.
 *
 * This routine will initialize the adapter, and setup the global parameters
 * along with the port's specific structure.
 */
static int __devinit
netxen_nic_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
{
      struct net_device *netdev = NULL;
      struct netxen_adapter *adapter = NULL;
      void __iomem *mem_ptr0 = NULL;
      void __iomem *mem_ptr1 = NULL;
      void __iomem *mem_ptr2 = NULL;
      unsigned long first_page_group_end;
      unsigned long first_page_group_start;


      u8 __iomem *db_ptr = NULL;
      unsigned long mem_base, mem_len, db_base, db_len;
      int pci_using_dac, i = 0, err;
      int ring;
      struct netxen_recv_context *recv_ctx = NULL;
      struct netxen_rcv_desc_ctx *rcv_desc = NULL;
      struct netxen_cmd_buffer *cmd_buf_arr = NULL;
      u64 mac_addr[FLASH_NUM_PORTS + 1];
      int valid_mac = 0;
      u32 val;
      int pci_func_id = PCI_FUNC(pdev->devfn);
      DECLARE_MAC_BUF(mac);

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

      if (pdev->class != 0x020000) {
            printk(KERN_ERR"NetXen function %d, class %x will not"
                        "be enabled.\n",pci_func_id, pdev->class);
            return -ENODEV;
      }
      if ((err = pci_enable_device(pdev)))
            return err;
      if (!(pci_resource_flags(pdev, 0) & IORESOURCE_MEM)) {
            err = -ENODEV;
            goto err_out_disable_pdev;
      }

      if ((err = pci_request_regions(pdev, netxen_nic_driver_name)))
            goto err_out_disable_pdev;

      pci_set_master(pdev);
      if (pdev->revision == NX_P2_C1 &&
          (pci_set_dma_mask(pdev, DMA_35BIT_MASK) == 0) &&
          (pci_set_consistent_dma_mask(pdev, DMA_35BIT_MASK) == 0)) {
            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)))
                  goto err_out_free_res;

            pci_using_dac = 0;
      }


      netdev = alloc_etherdev(sizeof(struct netxen_adapter));
      if(!netdev) {
            printk(KERN_ERR"%s: Failed to allocate memory for the "
                        "device block.Check system memory resource"
                        " usage.\n", netxen_nic_driver_name);
            goto err_out_free_res;
      }

      SET_NETDEV_DEV(netdev, &pdev->dev);

      adapter = netdev->priv;

      adapter->ahw.pdev = pdev;
      adapter->ahw.pci_func  = pci_func_id;
      spin_lock_init(&adapter->tx_lock);

      /* remap phys address */
      mem_base = pci_resource_start(pdev, 0);   /* 0 is for BAR 0 */
      mem_len = pci_resource_len(pdev, 0);

      /* 128 Meg of memory */
      if (mem_len == NETXEN_PCI_128MB_SIZE) {
            mem_ptr0 = ioremap(mem_base, FIRST_PAGE_GROUP_SIZE);
            mem_ptr1 = ioremap(mem_base + SECOND_PAGE_GROUP_START,
                        SECOND_PAGE_GROUP_SIZE);
            mem_ptr2 = ioremap(mem_base + THIRD_PAGE_GROUP_START,
                        THIRD_PAGE_GROUP_SIZE);
            first_page_group_start = FIRST_PAGE_GROUP_START;
            first_page_group_end   = FIRST_PAGE_GROUP_END;
      } else if (mem_len == NETXEN_PCI_32MB_SIZE) {
            mem_ptr1 = ioremap(mem_base, SECOND_PAGE_GROUP_SIZE);
            mem_ptr2 = ioremap(mem_base + THIRD_PAGE_GROUP_START -
                  SECOND_PAGE_GROUP_START, THIRD_PAGE_GROUP_SIZE);
            first_page_group_start = 0;
            first_page_group_end   = 0;
      } else {
            err = -EIO; 
            goto err_out_free_netdev;
      }

      if (((mem_ptr0 == 0UL) && (mem_len == NETXEN_PCI_128MB_SIZE)) ||
                  (mem_ptr1 == 0UL) || (mem_ptr2 == 0UL)) {
            DPRINTK(ERR,
                  "Cannot remap adapter memory aborting.:"
                  "0 -> %p, 1 -> %p, 2 -> %p\n",
                  mem_ptr0, mem_ptr1, mem_ptr2);

            err = -EIO;
            goto err_out_iounmap;
      }
      db_base = pci_resource_start(pdev, 4);    /* doorbell is on bar 4 */
      db_len = pci_resource_len(pdev, 4);

      if (db_len == 0) {
            printk(KERN_ERR "%s: doorbell is disabled\n",
                   netxen_nic_driver_name);
            err = -EIO;
            goto err_out_iounmap;
      }
      DPRINTK(INFO, "doorbell ioremap from %lx a size of %lx\n", db_base,
            db_len);

      db_ptr = ioremap(db_base, NETXEN_DB_MAPSIZE_BYTES);
      if (!db_ptr) {
            printk(KERN_ERR "%s: Failed to allocate doorbell map.",
                   netxen_nic_driver_name);
            err = -EIO;
            goto err_out_iounmap;
      }
      DPRINTK(INFO, "doorbell ioremaped at %p\n", db_ptr);

      adapter->ahw.pci_base0 = mem_ptr0;
      adapter->ahw.first_page_group_start = first_page_group_start;
      adapter->ahw.first_page_group_end   = first_page_group_end;
      adapter->ahw.pci_base1 = mem_ptr1;
      adapter->ahw.pci_base2 = mem_ptr2;
      adapter->ahw.db_base = db_ptr;
      adapter->ahw.db_len = db_len;

      adapter->netdev  = netdev;
      adapter->pdev    = pdev;

      netif_napi_add(netdev, &adapter->napi,
                   netxen_nic_poll, NETXEN_NETDEV_WEIGHT);

      /* this will be read from FW later */
      adapter->intr_scheme = -1;

      /* This will be reset for mezz cards  */
      adapter->portnum = pci_func_id;
      adapter->status   &= ~NETXEN_NETDEV_STATUS;
      adapter->rx_csum = 1;

      netdev->open               = netxen_nic_open;
      netdev->stop               = netxen_nic_close;
      netdev->hard_start_xmit    = netxen_nic_xmit_frame;
      netdev->get_stats    = netxen_nic_get_stats;    
      netdev->set_multicast_list = netxen_nic_set_multi;
      netdev->set_mac_address    = netxen_nic_set_mac;
      netdev->change_mtu         = netxen_nic_change_mtu;
      netdev->tx_timeout         = netxen_tx_timeout;
      netdev->watchdog_timeo     = HZ;

      netxen_nic_change_mtu(netdev, netdev->mtu);

      SET_ETHTOOL_OPS(netdev, &netxen_nic_ethtool_ops);
#ifdef CONFIG_NET_POLL_CONTROLLER
      netdev->poll_controller = netxen_nic_poll_controller;
#endif
      /* ScatterGather support */
      netdev->features = NETIF_F_SG;
      netdev->features |= NETIF_F_IP_CSUM;
      netdev->features |= NETIF_F_TSO;

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

      if (pci_enable_msi(pdev))
            adapter->flags &= ~NETXEN_NIC_MSI_ENABLED;
      else
            adapter->flags |= NETXEN_NIC_MSI_ENABLED;

      netdev->irq = pdev->irq;
      INIT_WORK(&adapter->tx_timeout_task, netxen_tx_timeout_task);

      /*
       * Set the CRB window to invalid. If any register in window 0 is
       * accessed it should set the window to 0 and then reset it to 1.
       */
      adapter->curr_window = 255;

      /* initialize the adapter */
      netxen_initialize_adapter_hw(adapter);

      /*
       *  Adapter in our case is quad port so initialize it before
       *  initializing the ports
       */

      netxen_initialize_adapter_ops(adapter);

      adapter->max_tx_desc_count = MAX_CMD_DESCRIPTORS_HOST;
      if ((adapter->ahw.boardcfg.board_type == NETXEN_BRDTYPE_P2_SB35_4G) ||
                  (adapter->ahw.boardcfg.board_type == 
                   NETXEN_BRDTYPE_P2_SB31_2G)) 
            adapter->max_rx_desc_count = MAX_RCV_DESCRIPTORS_1G;
      else
            adapter->max_rx_desc_count = MAX_RCV_DESCRIPTORS;
      adapter->max_jumbo_rx_desc_count = MAX_JUMBO_RCV_DESCRIPTORS;
      adapter->max_lro_rx_desc_count = MAX_LRO_RCV_DESCRIPTORS;

      cmd_buf_arr = (struct netxen_cmd_buffer *)vmalloc(TX_RINGSIZE);
      if (cmd_buf_arr == NULL) {
            printk(KERN_ERR
                   "%s: Could not allocate cmd_buf_arr memory:%d\n",
                   netxen_nic_driver_name, (int)TX_RINGSIZE);
            err = -ENOMEM;
            goto err_out_free_adapter;
      }
      memset(cmd_buf_arr, 0, TX_RINGSIZE);
      adapter->cmd_buf_arr = cmd_buf_arr;

      for (i = 0; i < MAX_RCV_CTX; ++i) {
            recv_ctx = &adapter->recv_ctx[i];
            for (ring = 0; ring < NUM_RCV_DESC_RINGS; ring++) {
                  rcv_desc = &recv_ctx->rcv_desc[ring];
                  switch (RCV_DESC_TYPE(ring)) {
                  case RCV_DESC_NORMAL:
                        rcv_desc->max_rx_desc_count =
                            adapter->max_rx_desc_count;
                        rcv_desc->flags = RCV_DESC_NORMAL;
                        rcv_desc->dma_size = RX_DMA_MAP_LEN;
                        rcv_desc->skb_size = MAX_RX_BUFFER_LENGTH;
                        break;

                  case RCV_DESC_JUMBO:
                        rcv_desc->max_rx_desc_count =
                            adapter->max_jumbo_rx_desc_count;
                        rcv_desc->flags = RCV_DESC_JUMBO;
                        rcv_desc->dma_size = RX_JUMBO_DMA_MAP_LEN;
                        rcv_desc->skb_size = MAX_RX_JUMBO_BUFFER_LENGTH;
                        break;

                  case RCV_RING_LRO:
                        rcv_desc->max_rx_desc_count =
                            adapter->max_lro_rx_desc_count;
                        rcv_desc->flags = RCV_DESC_LRO;
                        rcv_desc->dma_size = RX_LRO_DMA_MAP_LEN;
                        rcv_desc->skb_size = MAX_RX_LRO_BUFFER_LENGTH;
                        break;

                  }
                  rcv_desc->rx_buf_arr = (struct netxen_rx_buffer *)
                      vmalloc(RCV_BUFFSIZE);

                  if (rcv_desc->rx_buf_arr == NULL) {
                        printk(KERN_ERR "%s: Could not allocate"
                               "rcv_desc->rx_buf_arr memory:%d\n",
                               netxen_nic_driver_name,
                               (int)RCV_BUFFSIZE);
                        err = -ENOMEM;
                        goto err_out_free_rx_buffer;
                  }
                  memset(rcv_desc->rx_buf_arr, 0, RCV_BUFFSIZE);
            }

      }

      netxen_initialize_adapter_sw(adapter);    /* initialize the buffers in adapter */

      /* Mezz cards have PCI function 0,2,3 enabled */
      if ((adapter->ahw.boardcfg.board_type == NETXEN_BRDTYPE_P2_SB31_10G_IMEZ)
            && (pci_func_id >= 2))
                  adapter->portnum = pci_func_id - 2;

#ifdef CONFIG_IA64
      if(adapter->portnum == 0) {
            netxen_pinit_from_rom(adapter, 0);
            udelay(500);
            netxen_load_firmware(adapter);
      }
#endif

      init_timer(&adapter->watchdog_timer);
      adapter->ahw.xg_linkup = 0;
      adapter->watchdog_timer.function = &netxen_watchdog;
      adapter->watchdog_timer.data = (unsigned long)adapter;
      INIT_WORK(&adapter->watchdog_task, netxen_watchdog_task);
      adapter->ahw.pdev = pdev;
      adapter->proc_cmd_buf_counter = 0;
      adapter->ahw.revision_id = pdev->revision;

      /* make sure Window == 1 */
      netxen_nic_pci_change_crbwindow(adapter, 1);

      netxen_nic_update_cmd_producer(adapter, 0);
      netxen_nic_update_cmd_consumer(adapter, 0);
      writel(0, NETXEN_CRB_NORMALIZE(adapter, CRB_HOST_CMD_ADDR_LO));

      if (netxen_is_flash_supported(adapter) == 0 &&
          netxen_get_flash_mac_addr(adapter, mac_addr) == 0)
            valid_mac = 1;
      else
            valid_mac = 0;

      if (valid_mac) {
            unsigned char *p = (unsigned char *)&mac_addr[adapter->portnum];
            netdev->dev_addr[0] = *(p + 5);
            netdev->dev_addr[1] = *(p + 4);
            netdev->dev_addr[2] = *(p + 3);
            netdev->dev_addr[3] = *(p + 2);
            netdev->dev_addr[4] = *(p + 1);
            netdev->dev_addr[5] = *(p + 0);

            memcpy(netdev->perm_addr, netdev->dev_addr,
                  netdev->addr_len);
            if (!is_valid_ether_addr(netdev->perm_addr)) {
                  printk(KERN_ERR "%s: Bad MAC address %s.\n",
                         netxen_nic_driver_name,
                         print_mac(mac, netdev->dev_addr));
            } else {
                  if (adapter->macaddr_set)
                        adapter->macaddr_set(adapter,
                                          netdev->dev_addr);
            }
      }

      if (adapter->portnum == 0) {
            err = netxen_initialize_adapter_offload(adapter);
            if (err) 
                  goto err_out_free_rx_buffer;
            val = readl(NETXEN_CRB_NORMALIZE(adapter, 
                              NETXEN_CAM_RAM(0x1fc)));
            if (val == 0x55555555) {
                /* This is the first boot after power up */
                netxen_nic_read_w0(adapter, NETXEN_PCIE_REG(0x4), &val);
                  if (!(val & 0x4)) {
                        val |= 0x4;
                        netxen_nic_write_w0(adapter, NETXEN_PCIE_REG(0x4), val);
                        netxen_nic_read_w0(adapter, NETXEN_PCIE_REG(0x4), &val);
                        if (!(val & 0x4))
                              printk(KERN_ERR "%s: failed to set MSI bit in PCI-e reg\n",
                                          netxen_nic_driver_name);
                  }
                val = readl(NETXEN_CRB_NORMALIZE(adapter,
                              NETXEN_ROMUSB_GLB_SW_RESET));
                printk(KERN_INFO"NetXen: read 0x%08x for reset reg.\n",val);
                if (val != 0x80000f) {
                  /* clear the register for future unloads/loads */
                        writel(0, NETXEN_CRB_NORMALIZE(adapter,
                                          NETXEN_CAM_RAM(0x1fc)));
                        printk(KERN_ERR "ERROR in NetXen HW init sequence.\n");
                        err = -ENODEV;
                        goto err_out_free_dev;
                }
            }

            /* clear the register for future unloads/loads */
            writel(0, NETXEN_CRB_NORMALIZE(adapter, NETXEN_CAM_RAM(0x1fc)));
            printk(KERN_INFO "State: 0x%0x\n",
                  readl(NETXEN_CRB_NORMALIZE(adapter, CRB_CMDPEG_STATE)));

            /*
             * Tell the hardware our version number.
             */
            i = (_NETXEN_NIC_LINUX_MAJOR << 16) 
                  | ((_NETXEN_NIC_LINUX_MINOR << 8))
                  | (_NETXEN_NIC_LINUX_SUBVERSION);
            writel(i, NETXEN_CRB_NORMALIZE(adapter, CRB_DRIVER_VERSION));

            /* Unlock the HW, prompting the boot sequence */
            writel(1,
                  NETXEN_CRB_NORMALIZE(adapter,
                        NETXEN_ROMUSB_GLB_PEGTUNE_DONE));
            /* Handshake with the card before we register the devices. */
            netxen_phantom_init(adapter, NETXEN_NIC_PEG_TUNE);
      }

      /*
       * See if the firmware gave us a virtual-physical port mapping.
       */
      i = readl(NETXEN_CRB_NORMALIZE(adapter, CRB_V2P(adapter->portnum)));
      if (i != 0x55555555)
            physical_port[adapter->portnum] = i;

      netif_carrier_off(netdev);
      netif_stop_queue(netdev);

      if ((err = register_netdev(netdev))) {
            printk(KERN_ERR "%s: register_netdev failed port #%d"
                         " aborting\n", netxen_nic_driver_name,
                         adapter->portnum);
            err = -EIO;
            goto err_out_free_dev;
      }

      pci_set_drvdata(pdev, adapter);

      switch (adapter->ahw.board_type) {
            case NETXEN_NIC_GBE:
                  printk(KERN_INFO "%s: QUAD GbE board initialized\n",
                         netxen_nic_driver_name);
                  break;

            case NETXEN_NIC_XGBE:
                  printk(KERN_INFO "%s: XGbE board initialized\n", 
                              netxen_nic_driver_name);
                  break;
      }

      adapter->driver_mismatch = 0;

      return 0;

err_out_free_dev:
      if (adapter->portnum == 0)
            netxen_free_adapter_offload(adapter);

err_out_free_rx_buffer:
      for (i = 0; i < MAX_RCV_CTX; ++i) {
            recv_ctx = &adapter->recv_ctx[i];
            for (ring = 0; ring < NUM_RCV_DESC_RINGS; ring++) {
                  rcv_desc = &recv_ctx->rcv_desc[ring];
                  if (rcv_desc->rx_buf_arr != NULL) {
                        vfree(rcv_desc->rx_buf_arr);
                        rcv_desc->rx_buf_arr = NULL;
                  }
            }
      }
      vfree(cmd_buf_arr);

err_out_free_adapter:
      if (adapter->flags & NETXEN_NIC_MSI_ENABLED)
            pci_disable_msi(pdev);

      pci_set_drvdata(pdev, NULL);

      if (db_ptr)
            iounmap(db_ptr);

err_out_iounmap:
      if (mem_ptr0)
            iounmap(mem_ptr0);
      if (mem_ptr1)
            iounmap(mem_ptr1);
      if (mem_ptr2)
            iounmap(mem_ptr2);

err_out_free_netdev:
      free_netdev(netdev);

err_out_free_res:
      pci_release_regions(pdev);

err_out_disable_pdev:
      pci_disable_device(pdev);
      return err;
}

static void __devexit netxen_nic_remove(struct pci_dev *pdev)
{
      struct netxen_adapter *adapter;
      struct net_device *netdev;
      struct netxen_rx_buffer *buffer;
      struct netxen_recv_context *recv_ctx;
      struct netxen_rcv_desc_ctx *rcv_desc;
      int i, ctxid, ring;
      static int init_firmware_done = 0;

      adapter = pci_get_drvdata(pdev);
      if (adapter == NULL)
            return;

      netdev = adapter->netdev;

      unregister_netdev(netdev);

      if (adapter->is_up == NETXEN_ADAPTER_UP_MAGIC) {
            init_firmware_done++;
            netxen_free_hw_resources(adapter);
      }

      for (ctxid = 0; ctxid < MAX_RCV_CTX; ++ctxid) {
            recv_ctx = &adapter->recv_ctx[ctxid];
            for (ring = 0; ring < NUM_RCV_DESC_RINGS; ring++) {
                  rcv_desc = &recv_ctx->rcv_desc[ring];
                  for (i = 0; i < rcv_desc->max_rx_desc_count; ++i) {
                        buffer = &(rcv_desc->rx_buf_arr[i]);
                        if (buffer->state == NETXEN_BUFFER_FREE)
                              continue;
                        pci_unmap_single(pdev, buffer->dma,
                                     rcv_desc->dma_size,
                                     PCI_DMA_FROMDEVICE);
                        if (buffer->skb != NULL)
                              dev_kfree_skb_any(buffer->skb);
                  }
                  vfree(rcv_desc->rx_buf_arr);
            }
      }

      vfree(adapter->cmd_buf_arr);

      if (adapter->portnum == 0) {
            if (init_firmware_done) {
                  i = 100;
                  do {
                        if (dma_watchdog_shutdown_request(adapter) == 1)
                              break;
                        msleep(100);
                        if (dma_watchdog_shutdown_poll_result(adapter) == 1)
                              break;
                  } while (--i);

                  if (i == 0)
                        printk(KERN_ERR "%s: dma_watchdog_shutdown failed\n",
                                    netdev->name);

                  /* clear the register for future unloads/loads */
                  writel(0, NETXEN_CRB_NORMALIZE(adapter, NETXEN_CAM_RAM(0x1fc)));
                  printk(KERN_INFO "State: 0x%0x\n",
                        readl(NETXEN_CRB_NORMALIZE(adapter, CRB_CMDPEG_STATE)));

                  /* leave the hw in the same state as reboot */
                  writel(0, NETXEN_CRB_NORMALIZE(adapter, CRB_CMDPEG_STATE));
                  netxen_pinit_from_rom(adapter, 0);
                  msleep(1);
                  netxen_load_firmware(adapter);
                  netxen_phantom_init(adapter, NETXEN_NIC_PEG_TUNE);
            }

            /* clear the register for future unloads/loads */
            writel(0, NETXEN_CRB_NORMALIZE(adapter, NETXEN_CAM_RAM(0x1fc)));
            printk(KERN_INFO "State: 0x%0x\n",
                  readl(NETXEN_CRB_NORMALIZE(adapter, CRB_CMDPEG_STATE)));

            i = 100;
            do {
                  if (dma_watchdog_shutdown_request(adapter) == 1)
                        break;
                  msleep(100);
                  if (dma_watchdog_shutdown_poll_result(adapter) == 1)
                        break;
            } while (--i);

            if (i) {
                  netxen_free_adapter_offload(adapter);
            } else {
                  printk(KERN_ERR "%s: dma_watchdog_shutdown failed\n",
                              netdev->name);
            }
      }

      if (adapter->irq)
            free_irq(adapter->irq, adapter);

      if (adapter->flags & NETXEN_NIC_MSI_ENABLED)
            pci_disable_msi(pdev);

      iounmap(adapter->ahw.db_base);
      iounmap(adapter->ahw.pci_base0);
      iounmap(adapter->ahw.pci_base1);
      iounmap(adapter->ahw.pci_base2);

      pci_release_regions(pdev);
      pci_disable_device(pdev);
      pci_set_drvdata(pdev, NULL);

      free_netdev(netdev);
}

/*
 * Called when a network interface is made active
 * @returns 0 on success, negative value on failure
 */
static int netxen_nic_open(struct net_device *netdev)
{
      struct netxen_adapter *adapter = (struct netxen_adapter *)netdev->priv;
      int err = 0;
      int ctx, ring;

      if (adapter->is_up != NETXEN_ADAPTER_UP_MAGIC) {
            err = netxen_init_firmware(adapter);
            if (err != 0) {
                  printk(KERN_ERR "Failed to init firmware\n");
                  return -EIO;
            }
            netxen_nic_flash_print(adapter);

            /* setup all the resources for the Phantom... */
            /* this include the descriptors for rcv, tx, and status */
            netxen_nic_clear_stats(adapter);
            err = netxen_nic_hw_resources(adapter);
            if (err) {
                  printk(KERN_ERR "Error in setting hw resources:%d\n",
                         err);
                  return err;
            }
            for (ctx = 0; ctx < MAX_RCV_CTX; ++ctx) {
                  for (ring = 0; ring < NUM_RCV_DESC_RINGS; ring++)
                        netxen_post_rx_buffers(adapter, ctx, ring);
            }
            adapter->irq = adapter->ahw.pdev->irq;
            err = request_irq(adapter->ahw.pdev->irq, netxen_intr,
                          IRQF_SHARED|IRQF_SAMPLE_RANDOM, netdev->name,
                          adapter);
            if (err) {
                  printk(KERN_ERR "request_irq failed with: %d\n", err);
                  netxen_free_hw_resources(adapter);
                  return err;
            }

            adapter->is_up = NETXEN_ADAPTER_UP_MAGIC;
      }
      if (!adapter->driver_mismatch)
            mod_timer(&adapter->watchdog_timer, jiffies);

      napi_enable(&adapter->napi);

      netxen_nic_enable_int(adapter);

      /* Done here again so that even if phantom sw overwrote it,
       * we set it */
      if (adapter->init_port
          && adapter->init_port(adapter, adapter->portnum) != 0) {
          del_timer_sync(&adapter->watchdog_timer);
            printk(KERN_ERR "%s: Failed to initialize port %d\n",
                        netxen_nic_driver_name, adapter->portnum);
            napi_disable(&adapter->napi);
            return -EIO;
      }
      if (adapter->macaddr_set)
            adapter->macaddr_set(adapter, netdev->dev_addr);

      netxen_nic_set_link_parameters(adapter);

      netxen_nic_set_multi(netdev);
      if (adapter->set_mtu)
            adapter->set_mtu(adapter, netdev->mtu);

      if (!adapter->driver_mismatch)
            netif_start_queue(netdev);

      return 0;
}

/*
 * netxen_nic_close - Disables a network interface entry point
 */
static int netxen_nic_close(struct net_device *netdev)
{
      struct netxen_adapter *adapter = netdev_priv(netdev);
      int i, j;
      struct netxen_cmd_buffer *cmd_buff;
      struct netxen_skb_frag *buffrag;

      netif_carrier_off(netdev);
      netif_stop_queue(netdev);
      napi_disable(&adapter->napi);

      if (adapter->stop_port)
            adapter->stop_port(adapter);

      netxen_nic_disable_int(adapter);

      cmd_buff = adapter->cmd_buf_arr;
      for (i = 0; i < adapter->max_tx_desc_count; i++) {
            buffrag = cmd_buff->frag_array;
            if (buffrag->dma) {
                  pci_unmap_single(adapter->pdev, buffrag->dma,
                               buffrag->length, PCI_DMA_TODEVICE);
                  buffrag->dma = 0ULL;
            }
            for (j = 0; j < cmd_buff->frag_count; j++) {
                  buffrag++;
                  if (buffrag->dma) {
                        pci_unmap_page(adapter->pdev, buffrag->dma,
                                     buffrag->length, 
                                     PCI_DMA_TODEVICE);
                        buffrag->dma = 0ULL;
                  }
            }
            /* Free the skb we received in netxen_nic_xmit_frame */
            if (cmd_buff->skb) {
                  dev_kfree_skb_any(cmd_buff->skb);
                  cmd_buff->skb = NULL;
            }
            cmd_buff++;
      }
      if (adapter->is_up == NETXEN_ADAPTER_UP_MAGIC) {
            FLUSH_SCHEDULED_WORK();
            del_timer_sync(&adapter->watchdog_timer);
      }

      return 0;
}

static int netxen_nic_xmit_frame(struct sk_buff *skb, struct net_device *netdev)
{
      struct netxen_adapter *adapter = netdev_priv(netdev);
      struct netxen_hardware_context *hw = &adapter->ahw;
      unsigned int first_seg_len = skb->len - skb->data_len;
      struct netxen_skb_frag *buffrag;
      unsigned int i;

      u32 producer = 0;
      u32 saved_producer = 0;
      struct cmd_desc_type0 *hwdesc;
      int k;
      struct netxen_cmd_buffer *pbuf = NULL;
      static int dropped_packet = 0;
      int frag_count;
      u32 local_producer = 0;
      u32 max_tx_desc_count = 0;
      u32 last_cmd_consumer = 0;
      int no_of_desc;

      adapter->stats.xmitcalled++;
      frag_count = skb_shinfo(skb)->nr_frags + 1;

      if (unlikely(skb->len <= 0)) {
            dev_kfree_skb_any(skb);
            adapter->stats.badskblen++;
            return NETDEV_TX_OK;
      }

      if (frag_count > MAX_BUFFERS_PER_CMD) {
            printk("%s: %s netxen_nic_xmit_frame: frag_count (%d)"
                   "too large, can handle only %d frags\n",
                   netxen_nic_driver_name, netdev->name,
                   frag_count, MAX_BUFFERS_PER_CMD);
            adapter->stats.txdropped++;
            if ((++dropped_packet & 0xff) == 0xff)
                  printk("%s: %s droppped packets = %d\n",
                         netxen_nic_driver_name, netdev->name,
                         dropped_packet);

            return NETDEV_TX_OK;
      }

      /* There 4 fragments per descriptor */
      no_of_desc = (frag_count + 3) >> 2;
      if (netdev->features & NETIF_F_TSO) {
            if (skb_shinfo(skb)->gso_size > 0) {

                  no_of_desc++;
                  if ((ip_hdrlen(skb) + tcp_hdrlen(skb) +
                       sizeof(struct ethhdr)) >
                      (sizeof(struct cmd_desc_type0) - 2)) {
                        no_of_desc++;
                  }
            }
      }

      spin_lock_bh(&adapter->tx_lock);
      if (adapter->total_threads >= MAX_XMIT_PRODUCERS) {
            goto out_requeue;
      }
      local_producer = adapter->cmd_producer;
      k = adapter->cmd_producer;
      max_tx_desc_count = adapter->max_tx_desc_count;
      last_cmd_consumer = adapter->last_cmd_consumer;
      if ((k + no_of_desc) >=
          ((last_cmd_consumer <= k) ? last_cmd_consumer + max_tx_desc_count :
           last_cmd_consumer)) {
            goto out_requeue;
      }
      k = get_index_range(k, max_tx_desc_count, no_of_desc);
      adapter->cmd_producer = k;
      adapter->total_threads++;
      adapter->num_threads++;

      spin_unlock_bh(&adapter->tx_lock);
      /* Copy the descriptors into the hardware    */
      producer = local_producer;
      saved_producer = producer;
      hwdesc = &hw->cmd_desc_head[producer];
      memset(hwdesc, 0, sizeof(struct cmd_desc_type0));
      /* Take skb->data itself */
      pbuf = &adapter->cmd_buf_arr[producer];
      if ((netdev->features & NETIF_F_TSO) && skb_shinfo(skb)->gso_size > 0) {
            pbuf->mss = skb_shinfo(skb)->gso_size;
            hwdesc->mss = cpu_to_le16(skb_shinfo(skb)->gso_size);
      } else {
            pbuf->mss = 0;
            hwdesc->mss = 0;
      }
      pbuf->total_length = skb->len;
      pbuf->skb = skb;
      pbuf->cmd = TX_ETHER_PKT;
      pbuf->frag_count = frag_count;
      pbuf->port = adapter->portnum;
      buffrag = &pbuf->frag_array[0];
      buffrag->dma = pci_map_single(adapter->pdev, skb->data, first_seg_len,
                              PCI_DMA_TODEVICE);
      buffrag->length = first_seg_len;
      netxen_set_cmd_desc_totallength(hwdesc, skb->len);
      netxen_set_cmd_desc_num_of_buff(hwdesc, frag_count);
      netxen_set_cmd_desc_opcode(hwdesc, TX_ETHER_PKT);

      netxen_set_cmd_desc_port(hwdesc, adapter->portnum);
      netxen_set_cmd_desc_ctxid(hwdesc, adapter->portnum);
      hwdesc->buffer1_length = cpu_to_le16(first_seg_len);
      hwdesc->addr_buffer1 = cpu_to_le64(buffrag->dma);

      for (i = 1, k = 1; i < frag_count; i++, k++) {
            struct skb_frag_struct *frag;
            int len, temp_len;
            unsigned long offset;
            dma_addr_t temp_dma;

            /* move to next desc. if there is a need */
            if ((i & 0x3) == 0) {
                  k = 0;
                  producer = get_next_index(producer,
                                      adapter->max_tx_desc_count);
                  hwdesc = &hw->cmd_desc_head[producer];
                  memset(hwdesc, 0, sizeof(struct cmd_desc_type0));
                  pbuf = &adapter->cmd_buf_arr[producer];
                  pbuf->skb = NULL;
            }
            frag = &skb_shinfo(skb)->frags[i - 1];
            len = frag->size;
            offset = frag->page_offset;

            temp_len = len;
            temp_dma = pci_map_page(adapter->pdev, frag->page, offset,
                              len, PCI_DMA_TODEVICE);

            buffrag++;
            buffrag->dma = temp_dma;
            buffrag->length = temp_len;

            DPRINTK(INFO, "for loop. i=%d k=%d\n", i, k);
            switch (k) {
            case 0:
                  hwdesc->buffer1_length = cpu_to_le16(temp_len);
                  hwdesc->addr_buffer1 = cpu_to_le64(temp_dma);
                  break;
            case 1:
                  hwdesc->buffer2_length = cpu_to_le16(temp_len);
                  hwdesc->addr_buffer2 = cpu_to_le64(temp_dma);
                  break;
            case 2:
                  hwdesc->buffer3_length = cpu_to_le16(temp_len);
                  hwdesc->addr_buffer3 = cpu_to_le64(temp_dma);
                  break;
            case 3:
                  hwdesc->buffer4_length = cpu_to_le16(temp_len);
                  hwdesc->addr_buffer4 = cpu_to_le64(temp_dma);
                  break;
            }
            frag++;
      }
      producer = get_next_index(producer, adapter->max_tx_desc_count);

      /* might change opcode to TX_TCP_LSO */
      netxen_tso_check(adapter, &hw->cmd_desc_head[saved_producer], skb);

      /* For LSO, we need to copy the MAC/IP/TCP headers into
       * the descriptor ring
       */
      if (netxen_get_cmd_desc_opcode(&hw->cmd_desc_head[saved_producer])
          == TX_TCP_LSO) {
            int hdr_len, first_hdr_len, more_hdr;
            hdr_len = hw->cmd_desc_head[saved_producer].total_hdr_length;
            if (hdr_len > (sizeof(struct cmd_desc_type0) - 2)) {
                  first_hdr_len = sizeof(struct cmd_desc_type0) - 2;
                  more_hdr = 1;
            } else {
                  first_hdr_len = hdr_len;
                  more_hdr = 0;
            }
            /* copy the MAC/IP/TCP headers to the cmd descriptor list */
            hwdesc = &hw->cmd_desc_head[producer];
            pbuf = &adapter->cmd_buf_arr[producer];
            pbuf->skb = NULL;

            /* copy the first 64 bytes */
            memcpy(((void *)hwdesc) + 2,
                   (void *)(skb->data), first_hdr_len);
            producer = get_next_index(producer, max_tx_desc_count);

            if (more_hdr) {
                  hwdesc = &hw->cmd_desc_head[producer];
                  pbuf = &adapter->cmd_buf_arr[producer];
                  pbuf->skb = NULL;
                  /* copy the next 64 bytes - should be enough except
                   * for pathological case
                   */
                  skb_copy_from_linear_data_offset(skb, first_hdr_len,
                                           hwdesc,
                                           (hdr_len -
                                            first_hdr_len));
                  producer = get_next_index(producer, max_tx_desc_count);
            }
      }

      spin_lock_bh(&adapter->tx_lock);
      adapter->stats.txbytes += skb->len;

      /* Code to update the adapter considering how many producer threads
         are currently working */
      if ((--adapter->num_threads) == 0) {
            /* This is the last thread */
            u32 crb_producer = adapter->cmd_producer;
            netxen_nic_update_cmd_producer(adapter, crb_producer);
            wmb();
            adapter->total_threads = 0;
      }

      adapter->stats.xmitfinished++;
      netdev->trans_start = jiffies;

      spin_unlock_bh(&adapter->tx_lock);
      return NETDEV_TX_OK;

out_requeue:
      netif_stop_queue(netdev);
      adapter->flags |= NETXEN_NETDEV_STATUS;

      spin_unlock_bh(&adapter->tx_lock);
      return NETDEV_TX_BUSY;
}

static void netxen_watchdog(unsigned long v)
{
      struct netxen_adapter *adapter = (struct netxen_adapter *)v;

      SCHEDULE_WORK(&adapter->watchdog_task);
}

static void netxen_tx_timeout(struct net_device *netdev)
{
      struct netxen_adapter *adapter = (struct netxen_adapter *)
                                    netdev_priv(netdev);
      SCHEDULE_WORK(&adapter->tx_timeout_task);
}

static void netxen_tx_timeout_task(struct work_struct *work)
{
      struct netxen_adapter *adapter = 
            container_of(work, struct netxen_adapter, tx_timeout_task);

      printk(KERN_ERR "%s %s: transmit timeout, resetting.\n",
             netxen_nic_driver_name, adapter->netdev->name);

      netxen_nic_close(adapter->netdev);
      netxen_nic_open(adapter->netdev);
      adapter->netdev->trans_start = jiffies;
      netif_wake_queue(adapter->netdev);
}

static int
netxen_handle_int(struct netxen_adapter *adapter, struct net_device *netdev)
{
      u32 ret = 0;

      DPRINTK(INFO, "Entered handle ISR\n");
      adapter->stats.ints++;

      netxen_nic_disable_int(adapter);

      if (netxen_nic_rx_has_work(adapter) || netxen_nic_tx_has_work(adapter)) {
            if (netif_rx_schedule_prep(netdev, &adapter->napi)) {
                  /*
                   * Interrupts are already disabled.
                   */
                  __netif_rx_schedule(netdev, &adapter->napi);
            } else {
                  static unsigned int intcount = 0;
                  if ((++intcount & 0xfff) == 0xfff)
                        DPRINTK(KERN_ERR
                               "%s: %s interrupt %d while in poll\n",
                               netxen_nic_driver_name, netdev->name,
                               intcount);
            }
            ret = 1;
      }

      if (ret == 0) {
            netxen_nic_enable_int(adapter);
      }

      return ret;
}

/*
 * netxen_intr - Interrupt Handler
 * @irq: interrupt number
 * data points to adapter stucture (which may be handling more than 1 port
 */
irqreturn_t netxen_intr(int irq, void *data)
{
      struct netxen_adapter *adapter = data;
      struct net_device *netdev = adapter->netdev;
      u32 our_int = 0;

      if (!(adapter->flags & NETXEN_NIC_MSI_ENABLED)) {
            our_int = readl(NETXEN_CRB_NORMALIZE(adapter, CRB_INT_VECTOR));
            /* not our interrupt */
            if ((our_int & (0x80 << adapter->portnum)) == 0)
                  return IRQ_NONE;
      }

      if (adapter->intr_scheme == INTR_SCHEME_PERPORT) {
            /* claim interrupt */
            if (!(adapter->flags & NETXEN_NIC_MSI_ENABLED)) {
                  writel(our_int & ~((u32)(0x80 << adapter->portnum)),
                  NETXEN_CRB_NORMALIZE(adapter, CRB_INT_VECTOR));
            }
      }

      if (netif_running(netdev))
            netxen_handle_int(adapter, netdev);

      return IRQ_HANDLED;
}

static int netxen_nic_poll(struct napi_struct *napi, int budget)
{
      struct netxen_adapter *adapter = container_of(napi, struct netxen_adapter, napi);
      struct net_device *netdev = adapter->netdev;
      int done = 1;
      int ctx;
      int work_done;

      DPRINTK(INFO, "polling for %d descriptors\n", *budget);

      work_done = 0;
      for (ctx = 0; ctx < MAX_RCV_CTX; ++ctx) {
            /*
             * Fairness issue. This will give undue weight to the
             * receive context 0.
             */

            /*
             * To avoid starvation, we give each of our receivers,
             * a fraction of the quota. Sometimes, it might happen that we
             * have enough quota to process every packet, but since all the
             * packets are on one context, it gets only half of the quota,
             * and ends up not processing it.
             */
            work_done += netxen_process_rcv_ring(adapter, ctx,
                                         budget / MAX_RCV_CTX);
      }

      if (work_done >= budget)
            done = 0;

      if (netxen_process_cmd_ring((unsigned long)adapter) == 0)
            done = 0;

      DPRINTK(INFO, "new work_done: %d work_to_do: %d\n",
            work_done, work_to_do);
      if (done) {
            netif_rx_complete(netdev, napi);
            netxen_nic_enable_int(adapter);
      }

      return work_done;
}

#ifdef CONFIG_NET_POLL_CONTROLLER
static void netxen_nic_poll_controller(struct net_device *netdev)
{
      struct netxen_adapter *adapter = netdev_priv(netdev);
      disable_irq(adapter->irq);
      netxen_intr(adapter->irq, adapter);
      enable_irq(adapter->irq);
}
#endif

static struct pci_driver netxen_driver = {
      .name = netxen_nic_driver_name,
      .id_table = netxen_pci_tbl,
      .probe = netxen_nic_probe,
      .remove = __devexit_p(netxen_nic_remove)
};

/* Driver Registration on NetXen card    */

static int __init netxen_init_module(void)
{
      if ((netxen_workq = create_singlethread_workqueue("netxen")) == 0)
            return -ENOMEM;

      return pci_register_driver(&netxen_driver);
}

module_init(netxen_init_module);

static void __exit netxen_exit_module(void)
{
      /*
       * Wait for some time to allow the dma to drain, if any.
       */
      msleep(100);
      pci_unregister_driver(&netxen_driver);
      destroy_workqueue(netxen_workq);
}

module_exit(netxen_exit_module);

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