git.oblomov.eu Git - linux-2.6/blob - drivers/net/ixgb/ixgb_main.c

   1 /*******************************************************************************
   2
   3   Intel PRO/10GbE Linux driver
   4   Copyright(c) 1999 - 2006 Intel Corporation.
   5
   6   This program is free software; you can redistribute it and/or modify it
   7   under the terms and conditions of the GNU General Public License,
   8   version 2, as published by the Free Software Foundation.
   9
  10   This program is distributed in the hope it will be useful, but WITHOUT
  11   ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  12   FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  13   more details.
  14
  15   You should have received a copy of the GNU General Public License along with
  16   this program; if not, write to the Free Software Foundation, Inc.,
  17   51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
  18
  19   The full GNU General Public License is included in this distribution in
  20   the file called "COPYING".
  21
  22   Contact Information:
  23   Linux NICS <linux.nics@intel.com>
  24   e1000-devel Mailing List <e1000-devel@lists.sourceforge.net>
  25   Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
  26
  27 *******************************************************************************/
  28
  29 #include "ixgb.h"
  30
  31 char ixgb_driver_name[] = "ixgb";
  32 static char ixgb_driver_string[] = "Intel(R) PRO/10GbE Network Driver";
  33
  34 #ifndef CONFIG_IXGB_NAPI
  35 #define DRIVERNAPI
  36 #else
  37 #define DRIVERNAPI "-NAPI"
  38 #endif
  39 #define DRV_VERSION             "1.0.126-k2"DRIVERNAPI
  40 char ixgb_driver_version[] = DRV_VERSION;
  41 static char ixgb_copyright[] = "Copyright (c) 1999-2006 Intel Corporation.";
  42
  43 /* ixgb_pci_tbl - PCI Device ID Table
  44  *
  45  * Wildcard entries (PCI_ANY_ID) should come last
  46  * Last entry must be all 0s
  47  *
  48  * { Vendor ID, Device ID, SubVendor ID, SubDevice ID,
  49  *   Class, Class Mask, private data (not used) }
  50  */
  51 static struct pci_device_id ixgb_pci_tbl[] = {
  52         {INTEL_VENDOR_ID, IXGB_DEVICE_ID_82597EX,
  53          PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
  54         {INTEL_VENDOR_ID, IXGB_DEVICE_ID_82597EX_CX4,
  55          PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
  56         {INTEL_VENDOR_ID, IXGB_DEVICE_ID_82597EX_SR,
  57          PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
  58         {INTEL_VENDOR_ID, IXGB_DEVICE_ID_82597EX_LR,
  59          PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
  60
  61         /* required last entry */
  62         {0,}
  63 };
  64
  65 MODULE_DEVICE_TABLE(pci, ixgb_pci_tbl);
  66
  67 /* Local Function Prototypes */
  68
  69 int ixgb_up(struct ixgb_adapter *adapter);
  70 void ixgb_down(struct ixgb_adapter *adapter, boolean_t kill_watchdog);
  71 void ixgb_reset(struct ixgb_adapter *adapter);
  72 int ixgb_setup_tx_resources(struct ixgb_adapter *adapter);
  73 int ixgb_setup_rx_resources(struct ixgb_adapter *adapter);
  74 void ixgb_free_tx_resources(struct ixgb_adapter *adapter);
  75 void ixgb_free_rx_resources(struct ixgb_adapter *adapter);
  76 void ixgb_update_stats(struct ixgb_adapter *adapter);
  77
  78 static int ixgb_init_module(void);
  79 static void ixgb_exit_module(void);
  80 static int ixgb_probe(struct pci_dev *pdev, const struct pci_device_id *ent);
  81 static void __devexit ixgb_remove(struct pci_dev *pdev);
  82 static int ixgb_sw_init(struct ixgb_adapter *adapter);
  83 static int ixgb_open(struct net_device *netdev);
  84 static int ixgb_close(struct net_device *netdev);
  85 static void ixgb_configure_tx(struct ixgb_adapter *adapter);
  86 static void ixgb_configure_rx(struct ixgb_adapter *adapter);
  87 static void ixgb_setup_rctl(struct ixgb_adapter *adapter);
  88 static void ixgb_clean_tx_ring(struct ixgb_adapter *adapter);
  89 static void ixgb_clean_rx_ring(struct ixgb_adapter *adapter);
  90 static void ixgb_set_multi(struct net_device *netdev);
  91 static void ixgb_watchdog(unsigned long data);
  92 static int ixgb_xmit_frame(struct sk_buff *skb, struct net_device *netdev);
  93 static struct net_device_stats *ixgb_get_stats(struct net_device *netdev);
  94 static int ixgb_change_mtu(struct net_device *netdev, int new_mtu);
  95 static int ixgb_set_mac(struct net_device *netdev, void *p);
  96 static irqreturn_t ixgb_intr(int irq, void *data);
  97 static boolean_t ixgb_clean_tx_irq(struct ixgb_adapter *adapter);
  98
  99 #ifdef CONFIG_IXGB_NAPI
 100 static int ixgb_clean(struct net_device *netdev, int *budget);
 101 static boolean_t ixgb_clean_rx_irq(struct ixgb_adapter *adapter,
 102                                    int *work_done, int work_to_do);
 103 #else
 104 static boolean_t ixgb_clean_rx_irq(struct ixgb_adapter *adapter);
 105 #endif
 106 static void ixgb_alloc_rx_buffers(struct ixgb_adapter *adapter);
 107 void ixgb_set_ethtool_ops(struct net_device *netdev);
 108 static void ixgb_tx_timeout(struct net_device *dev);
 109 static void ixgb_tx_timeout_task(struct work_struct *work);
 110 static void ixgb_vlan_rx_register(struct net_device *netdev,
 111                                   struct vlan_group *grp);
 112 static void ixgb_vlan_rx_add_vid(struct net_device *netdev, uint16_t vid);
 113 static void ixgb_vlan_rx_kill_vid(struct net_device *netdev, uint16_t vid);
 114 static void ixgb_restore_vlan(struct ixgb_adapter *adapter);
 115
 116 #ifdef CONFIG_NET_POLL_CONTROLLER
 117 /* for netdump / net console */
 118 static void ixgb_netpoll(struct net_device *dev);
 119 #endif
 120
 121 static pci_ers_result_t ixgb_io_error_detected (struct pci_dev *pdev,
 122                              enum pci_channel_state state);
 123 static pci_ers_result_t ixgb_io_slot_reset (struct pci_dev *pdev);
 124 static void ixgb_io_resume (struct pci_dev *pdev);
 125
 126 /* Exported from other modules */
 127 extern void ixgb_check_options(struct ixgb_adapter *adapter);
 128
 129 static struct pci_error_handlers ixgb_err_handler = {
 130         .error_detected = ixgb_io_error_detected,
 131         .slot_reset = ixgb_io_slot_reset,
 132         .resume = ixgb_io_resume,
 133 };
 134
 135 static struct pci_driver ixgb_driver = {
 136         .name     = ixgb_driver_name,
 137         .id_table = ixgb_pci_tbl,
 138         .probe    = ixgb_probe,
 139         .remove   = __devexit_p(ixgb_remove),
 140         .err_handler = &ixgb_err_handler
 141 };
 142
 143 MODULE_AUTHOR("Intel Corporation, <linux.nics@intel.com>");
 144 MODULE_DESCRIPTION("Intel(R) PRO/10GbE Network Driver");
 145 MODULE_LICENSE("GPL");
 146 MODULE_VERSION(DRV_VERSION);
 147
 148 #define DEFAULT_DEBUG_LEVEL_SHIFT 3
 149 static int debug = DEFAULT_DEBUG_LEVEL_SHIFT;
 150 module_param(debug, int, 0);
 151 MODULE_PARM_DESC(debug, "Debug level (0=none,...,16=all)");
 152
 153 /* some defines for controlling descriptor fetches in h/w */
 154 #define RXDCTL_WTHRESH_DEFAULT 15  /* chip writes back at this many or RXT0 */
 155 #define RXDCTL_PTHRESH_DEFAULT 0   /* chip considers prefech below
 156                                     * this */
 157 #define RXDCTL_HTHRESH_DEFAULT 0   /* chip will only prefetch if tail
 158                                     * is pushed this many descriptors
 159                                     * from head */
 160
 161 /**
 162  * ixgb_init_module - Driver Registration Routine
 163  *
 164  * ixgb_init_module is the first routine called when the driver is
 165  * loaded. All it does is register with the PCI subsystem.
 166  **/
 167
 168 static int __init
 169 ixgb_init_module(void)
 170 {
 171         printk(KERN_INFO "%s - version %s\n",
 172                ixgb_driver_string, ixgb_driver_version);
 173
 174         printk(KERN_INFO "%s\n", ixgb_copyright);
 175
 176         return pci_register_driver(&ixgb_driver);
 177 }
 178
 179 module_init(ixgb_init_module);
 180
 181 /**
 182  * ixgb_exit_module - Driver Exit Cleanup Routine
 183  *
 184  * ixgb_exit_module is called just before the driver is removed
 185  * from memory.
 186  **/
 187
 188 static void __exit
 189 ixgb_exit_module(void)
 190 {
 191         pci_unregister_driver(&ixgb_driver);
 192 }
 193
 194 module_exit(ixgb_exit_module);
 195
 196 /**
 197  * ixgb_irq_disable - Mask off interrupt generation on the NIC
 198  * @adapter: board private structure
 199  **/
 200
 201 static void
 202 ixgb_irq_disable(struct ixgb_adapter *adapter)
 203 {
 204         atomic_inc(&adapter->irq_sem);
 205         IXGB_WRITE_REG(&adapter->hw, IMC, ~0);
 206         IXGB_WRITE_FLUSH(&adapter->hw);
 207         synchronize_irq(adapter->pdev->irq);
 208 }
 209
 210 /**
 211  * ixgb_irq_enable - Enable default interrupt generation settings
 212  * @adapter: board private structure
 213  **/
 214
 215 static void
 216 ixgb_irq_enable(struct ixgb_adapter *adapter)
 217 {
 218         if(atomic_dec_and_test(&adapter->irq_sem)) {
 219                 IXGB_WRITE_REG(&adapter->hw, IMS,
 220                                IXGB_INT_RXT0 | IXGB_INT_RXDMT0 | IXGB_INT_TXDW |
 221                                IXGB_INT_LSC);
 222                 IXGB_WRITE_FLUSH(&adapter->hw);
 223         }
 224 }
 225
 226 int
 227 ixgb_up(struct ixgb_adapter *adapter)
 228 {
 229         struct net_device *netdev = adapter->netdev;
 230         int err, irq_flags = IRQF_SHARED;
 231         int max_frame = netdev->mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;
 232         struct ixgb_hw *hw = &adapter->hw;
 233
 234         /* hardware has been reset, we need to reload some things */
 235
 236         ixgb_rar_set(hw, netdev->dev_addr, 0);
 237         ixgb_set_multi(netdev);
 238
 239         ixgb_restore_vlan(adapter);
 240
 241         ixgb_configure_tx(adapter);
 242         ixgb_setup_rctl(adapter);
 243         ixgb_configure_rx(adapter);
 244         ixgb_alloc_rx_buffers(adapter);
 245
 246         /* disable interrupts and get the hardware into a known state */
 247         IXGB_WRITE_REG(&adapter->hw, IMC, 0xffffffff);
 248
 249         /* only enable MSI if bus is in PCI-X mode */
 250         if (IXGB_READ_REG(&adapter->hw, STATUS) & IXGB_STATUS_PCIX_MODE) {
 251                 err = pci_enable_msi(adapter->pdev);
 252                 if (!err) {
 253                         adapter->have_msi = 1;
 254                         irq_flags = 0;
 255                 }
 256                 /* proceed to try to request regular interrupt */
 257         }
 258
 259         err = request_irq(adapter->pdev->irq, &ixgb_intr, irq_flags,
 260                           netdev->name, netdev);
 261         if (err) {
 262                 if (adapter->have_msi)
 263                         pci_disable_msi(adapter->pdev);
 264                 DPRINTK(PROBE, ERR,
 265                  "Unable to allocate interrupt Error: %d\n", err);
 266                 return err;
 267         }
 268
 269         if((hw->max_frame_size != max_frame) ||
 270                 (hw->max_frame_size !=
 271                 (IXGB_READ_REG(hw, MFS) >> IXGB_MFS_SHIFT))) {
 272
 273                 hw->max_frame_size = max_frame;
 274
 275                 IXGB_WRITE_REG(hw, MFS, hw->max_frame_size << IXGB_MFS_SHIFT);
 276
 277                 if(hw->max_frame_size >
 278                    IXGB_MAX_ENET_FRAME_SIZE_WITHOUT_FCS + ENET_FCS_LENGTH) {
 279                         uint32_t ctrl0 = IXGB_READ_REG(hw, CTRL0);
 280
 281                         if(!(ctrl0 & IXGB_CTRL0_JFE)) {
 282                                 ctrl0 |= IXGB_CTRL0_JFE;
 283                                 IXGB_WRITE_REG(hw, CTRL0, ctrl0);
 284                         }
 285                 }
 286         }
 287
 288         mod_timer(&adapter->watchdog_timer, jiffies);
 289
 290 #ifdef CONFIG_IXGB_NAPI
 291         netif_poll_enable(netdev);
 292 #endif
 293         ixgb_irq_enable(adapter);
 294
 295         return 0;
 296 }
 297
 298 void
 299 ixgb_down(struct ixgb_adapter *adapter, boolean_t kill_watchdog)
 300 {
 301         struct net_device *netdev = adapter->netdev;
 302
 303         ixgb_irq_disable(adapter);
 304         free_irq(adapter->pdev->irq, netdev);
 305
 306         if (adapter->have_msi)
 307                 pci_disable_msi(adapter->pdev);
 308
 309         if(kill_watchdog)
 310                 del_timer_sync(&adapter->watchdog_timer);
 311 #ifdef CONFIG_IXGB_NAPI
 312         netif_poll_disable(netdev);
 313 #endif
 314         adapter->link_speed = 0;
 315         adapter->link_duplex = 0;
 316         netif_carrier_off(netdev);
 317         netif_stop_queue(netdev);
 318
 319         ixgb_reset(adapter);
 320         ixgb_clean_tx_ring(adapter);
 321         ixgb_clean_rx_ring(adapter);
 322 }
 323
 324 void
 325 ixgb_reset(struct ixgb_adapter *adapter)
 326 {
 327
 328         ixgb_adapter_stop(&adapter->hw);
 329         if(!ixgb_init_hw(&adapter->hw))
 330                 DPRINTK(PROBE, ERR, "ixgb_init_hw failed.\n");
 331 }
 332
 333 /**
 334  * ixgb_probe - Device Initialization Routine
 335  * @pdev: PCI device information struct
 336  * @ent: entry in ixgb_pci_tbl
 337  *
 338  * Returns 0 on success, negative on failure
 339  *
 340  * ixgb_probe initializes an adapter identified by a pci_dev structure.
 341  * The OS initialization, configuring of the adapter private structure,
 342  * and a hardware reset occur.
 343  **/
 344
 345 static int __devinit
 346 ixgb_probe(struct pci_dev *pdev,
 347                 const struct pci_device_id *ent)
 348 {
 349         struct net_device *netdev = NULL;
 350         struct ixgb_adapter *adapter;
 351         static int cards_found = 0;
 352         unsigned long mmio_start;
 353         int mmio_len;
 354         int pci_using_dac;
 355         int i;
 356         int err;
 357
 358         if((err = pci_enable_device(pdev)))
 359                 return err;
 360
 361         if(!(err = pci_set_dma_mask(pdev, DMA_64BIT_MASK)) &&
 362            !(err = pci_set_consistent_dma_mask(pdev, DMA_64BIT_MASK))) {
 363                 pci_using_dac = 1;
 364         } else {
 365                 if((err = pci_set_dma_mask(pdev, DMA_32BIT_MASK)) ||
 366                    (err = pci_set_consistent_dma_mask(pdev, DMA_32BIT_MASK))) {
 367                         printk(KERN_ERR
 368                          "ixgb: No usable DMA configuration, aborting\n");
 369                         goto err_dma_mask;
 370                 }
 371                 pci_using_dac = 0;
 372         }
 373
 374         if((err = pci_request_regions(pdev, ixgb_driver_name)))
 375                 goto err_request_regions;
 376
 377         pci_set_master(pdev);
 378
 379         netdev = alloc_etherdev(sizeof(struct ixgb_adapter));
 380         if(!netdev) {
 381                 err = -ENOMEM;
 382                 goto err_alloc_etherdev;
 383         }
 384
 385         SET_MODULE_OWNER(netdev);
 386         SET_NETDEV_DEV(netdev, &pdev->dev);
 387
 388         pci_set_drvdata(pdev, netdev);
 389         adapter = netdev_priv(netdev);
 390         adapter->netdev = netdev;
 391         adapter->pdev = pdev;
 392         adapter->hw.back = adapter;
 393         adapter->msg_enable = netif_msg_init(debug, DEFAULT_DEBUG_LEVEL_SHIFT);
 394
 395         mmio_start = pci_resource_start(pdev, BAR_0);
 396         mmio_len = pci_resource_len(pdev, BAR_0);
 397
 398         adapter->hw.hw_addr = ioremap(mmio_start, mmio_len);
 399         if(!adapter->hw.hw_addr) {
 400                 err = -EIO;
 401                 goto err_ioremap;
 402         }
 403
 404         for(i = BAR_1; i <= BAR_5; i++) {
 405                 if(pci_resource_len(pdev, i) == 0)
 406                         continue;
 407                 if(pci_resource_flags(pdev, i) & IORESOURCE_IO) {
 408                         adapter->hw.io_base = pci_resource_start(pdev, i);
 409                         break;
 410                 }
 411         }
 412
 413         netdev->open = &ixgb_open;
 414         netdev->stop = &ixgb_close;
 415         netdev->hard_start_xmit = &ixgb_xmit_frame;
 416         netdev->get_stats = &ixgb_get_stats;
 417         netdev->set_multicast_list = &ixgb_set_multi;
 418         netdev->set_mac_address = &ixgb_set_mac;
 419         netdev->change_mtu = &ixgb_change_mtu;
 420         ixgb_set_ethtool_ops(netdev);
 421         netdev->tx_timeout = &ixgb_tx_timeout;
 422         netdev->watchdog_timeo = 5 * HZ;
 423 #ifdef CONFIG_IXGB_NAPI
 424         netdev->poll = &ixgb_clean;
 425         netdev->weight = 64;
 426 #endif
 427         netdev->vlan_rx_register = ixgb_vlan_rx_register;
 428         netdev->vlan_rx_add_vid = ixgb_vlan_rx_add_vid;
 429         netdev->vlan_rx_kill_vid = ixgb_vlan_rx_kill_vid;
 430 #ifdef CONFIG_NET_POLL_CONTROLLER
 431         netdev->poll_controller = ixgb_netpoll;
 432 #endif
 433
 434         strncpy(netdev->name, pci_name(pdev), sizeof(netdev->name) - 1);
 435         netdev->mem_start = mmio_start;
 436         netdev->mem_end = mmio_start + mmio_len;
 437         netdev->base_addr = adapter->hw.io_base;
 438
 439         adapter->bd_number = cards_found;
 440         adapter->link_speed = 0;
 441         adapter->link_duplex = 0;
 442
 443         /* setup the private structure */
 444
 445         if((err = ixgb_sw_init(adapter)))
 446                 goto err_sw_init;
 447
 448         netdev->features = NETIF_F_SG |
 449                            NETIF_F_HW_CSUM |
 450                            NETIF_F_HW_VLAN_TX |
 451                            NETIF_F_HW_VLAN_RX |
 452                            NETIF_F_HW_VLAN_FILTER;
 453         netdev->features |= NETIF_F_TSO;
 454 #ifdef NETIF_F_LLTX
 455         netdev->features |= NETIF_F_LLTX;
 456 #endif
 457
 458         if(pci_using_dac)
 459                 netdev->features |= NETIF_F_HIGHDMA;
 460
 461         /* make sure the EEPROM is good */
 462
 463         if(!ixgb_validate_eeprom_checksum(&adapter->hw)) {
 464                 DPRINTK(PROBE, ERR, "The EEPROM Checksum Is Not Valid\n");
 465                 err = -EIO;
 466                 goto err_eeprom;
 467         }
 468
 469         ixgb_get_ee_mac_addr(&adapter->hw, netdev->dev_addr);
 470         memcpy(netdev->perm_addr, netdev->dev_addr, netdev->addr_len);
 471
 472         if(!is_valid_ether_addr(netdev->perm_addr)) {
 473                 DPRINTK(PROBE, ERR, "Invalid MAC Address\n");
 474                 err = -EIO;
 475                 goto err_eeprom;
 476         }
 477
 478         adapter->part_num = ixgb_get_ee_pba_number(&adapter->hw);
 479
 480         init_timer(&adapter->watchdog_timer);
 481         adapter->watchdog_timer.function = &ixgb_watchdog;
 482         adapter->watchdog_timer.data = (unsigned long)adapter;
 483
 484         INIT_WORK(&adapter->tx_timeout_task, ixgb_tx_timeout_task);
 485
 486         strcpy(netdev->name, "eth%d");
 487         if((err = register_netdev(netdev)))
 488                 goto err_register;
 489
 490         /* we're going to reset, so assume we have no link for now */
 491
 492         netif_carrier_off(netdev);
 493         netif_stop_queue(netdev);
 494
 495         DPRINTK(PROBE, INFO, "Intel(R) PRO/10GbE Network Connection\n");
 496         ixgb_check_options(adapter);
 497         /* reset the hardware with the new settings */
 498
 499         ixgb_reset(adapter);
 500
 501         cards_found++;
 502         return 0;
 503
 504 err_register:
 505 err_sw_init:
 506 err_eeprom:
 507         iounmap(adapter->hw.hw_addr);
 508 err_ioremap:
 509         free_netdev(netdev);
 510 err_alloc_etherdev:
 511         pci_release_regions(pdev);
 512 err_request_regions:
 513 err_dma_mask:
 514         pci_disable_device(pdev);
 515         return err;
 516 }
 517
 518 /**
 519  * ixgb_remove - Device Removal Routine
 520  * @pdev: PCI device information struct
 521  *
 522  * ixgb_remove is called by the PCI subsystem to alert the driver
 523  * that it should release a PCI device.  The could be caused by a
 524  * Hot-Plug event, or because the driver is going to be removed from
 525  * memory.
 526  **/
 527
 528 static void __devexit
 529 ixgb_remove(struct pci_dev *pdev)
 530 {
 531         struct net_device *netdev = pci_get_drvdata(pdev);
 532         struct ixgb_adapter *adapter = netdev_priv(netdev);
 533
 534         unregister_netdev(netdev);
 535
 536         iounmap(adapter->hw.hw_addr);
 537         pci_release_regions(pdev);
 538
 539         free_netdev(netdev);
 540 }
 541
 542 /**
 543  * ixgb_sw_init - Initialize general software structures (struct ixgb_adapter)
 544  * @adapter: board private structure to initialize
 545  *
 546  * ixgb_sw_init initializes the Adapter private data structure.
 547  * Fields are initialized based on PCI device information and
 548  * OS network device settings (MTU size).
 549  **/
 550
 551 static int __devinit
 552 ixgb_sw_init(struct ixgb_adapter *adapter)
 553 {
 554         struct ixgb_hw *hw = &adapter->hw;
 555         struct net_device *netdev = adapter->netdev;
 556         struct pci_dev *pdev = adapter->pdev;
 557
 558         /* PCI config space info */
 559
 560         hw->vendor_id = pdev->vendor;
 561         hw->device_id = pdev->device;
 562         hw->subsystem_vendor_id = pdev->subsystem_vendor;
 563         hw->subsystem_id = pdev->subsystem_device;
 564
 565         hw->max_frame_size = netdev->mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;
 566         adapter->rx_buffer_len = hw->max_frame_size;
 567
 568         if((hw->device_id == IXGB_DEVICE_ID_82597EX)
 569            || (hw->device_id == IXGB_DEVICE_ID_82597EX_CX4)
 570            || (hw->device_id == IXGB_DEVICE_ID_82597EX_LR)
 571            || (hw->device_id == IXGB_DEVICE_ID_82597EX_SR))
 572                         hw->mac_type = ixgb_82597;
 573         else {
 574                 /* should never have loaded on this device */
 575                 DPRINTK(PROBE, ERR, "unsupported device id\n");
 576         }
 577
 578         /* enable flow control to be programmed */
 579         hw->fc.send_xon = 1;
 580
 581         atomic_set(&adapter->irq_sem, 1);
 582         spin_lock_init(&adapter->tx_lock);
 583
 584         return 0;
 585 }
 586
 587 /**
 588  * ixgb_open - Called when a network interface is made active
 589  * @netdev: network interface device structure
 590  *
 591  * Returns 0 on success, negative value on failure
 592  *
 593  * The open entry point is called when a network interface is made
 594  * active by the system (IFF_UP).  At this point all resources needed
 595  * for transmit and receive operations are allocated, the interrupt
 596  * handler is registered with the OS, the watchdog timer is started,
 597  * and the stack is notified that the interface is ready.
 598  **/
 599
 600 static int
 601 ixgb_open(struct net_device *netdev)
 602 {
 603         struct ixgb_adapter *adapter = netdev_priv(netdev);
 604         int err;
 605
 606         /* allocate transmit descriptors */
 607
 608         if((err = ixgb_setup_tx_resources(adapter)))
 609                 goto err_setup_tx;
 610
 611         /* allocate receive descriptors */
 612
 613         if((err = ixgb_setup_rx_resources(adapter)))
 614                 goto err_setup_rx;
 615
 616         if((err = ixgb_up(adapter)))
 617                 goto err_up;
 618
 619         return 0;
 620
 621 err_up:
 622         ixgb_free_rx_resources(adapter);
 623 err_setup_rx:
 624         ixgb_free_tx_resources(adapter);
 625 err_setup_tx:
 626         ixgb_reset(adapter);
 627
 628         return err;
 629 }
 630
 631 /**
 632  * ixgb_close - Disables a network interface
 633  * @netdev: network interface device structure
 634  *
 635  * Returns 0, this is not allowed to fail
 636  *
 637  * The close entry point is called when an interface is de-activated
 638  * by the OS.  The hardware is still under the drivers control, but
 639  * needs to be disabled.  A global MAC reset is issued to stop the
 640  * hardware, and all transmit and receive resources are freed.
 641  **/
 642
 643 static int
 644 ixgb_close(struct net_device *netdev)
 645 {
 646         struct ixgb_adapter *adapter = netdev_priv(netdev);
 647
 648         ixgb_down(adapter, TRUE);
 649
 650         ixgb_free_tx_resources(adapter);
 651         ixgb_free_rx_resources(adapter);
 652
 653         return 0;
 654 }
 655
 656 /**
 657  * ixgb_setup_tx_resources - allocate Tx resources (Descriptors)
 658  * @adapter: board private structure
 659  *
 660  * Return 0 on success, negative on failure
 661  **/
 662
 663 int
 664 ixgb_setup_tx_resources(struct ixgb_adapter *adapter)
 665 {
 666         struct ixgb_desc_ring *txdr = &adapter->tx_ring;
 667         struct pci_dev *pdev = adapter->pdev;
 668         int size;
 669
 670         size = sizeof(struct ixgb_buffer) * txdr->count;
 671         txdr->buffer_info = vmalloc(size);
 672         if(!txdr->buffer_info) {
 673                 DPRINTK(PROBE, ERR,
 674                  "Unable to allocate transmit descriptor ring memory\n");
 675                 return -ENOMEM;
 676         }
 677         memset(txdr->buffer_info, 0, size);
 678
 679         /* round up to nearest 4K */
 680
 681         txdr->size = txdr->count * sizeof(struct ixgb_tx_desc);
 682         txdr->size = ALIGN(txdr->size, 4096);
 683
 684         txdr->desc = pci_alloc_consistent(pdev, txdr->size, &txdr->dma);
 685         if(!txdr->desc) {
 686                 vfree(txdr->buffer_info);
 687                 DPRINTK(PROBE, ERR,
 688                  "Unable to allocate transmit descriptor memory\n");
 689                 return -ENOMEM;
 690         }
 691         memset(txdr->desc, 0, txdr->size);
 692
 693         txdr->next_to_use = 0;
 694         txdr->next_to_clean = 0;
 695
 696         return 0;
 697 }
 698
 699 /**
 700  * ixgb_configure_tx - Configure 82597 Transmit Unit after Reset.
 701  * @adapter: board private structure
 702  *
 703  * Configure the Tx unit of the MAC after a reset.
 704  **/
 705
 706 static void
 707 ixgb_configure_tx(struct ixgb_adapter *adapter)
 708 {
 709         uint64_t tdba = adapter->tx_ring.dma;
 710         uint32_t tdlen = adapter->tx_ring.count * sizeof(struct ixgb_tx_desc);
 711         uint32_t tctl;
 712         struct ixgb_hw *hw = &adapter->hw;
 713
 714         /* Setup the Base and Length of the Tx Descriptor Ring
 715          * tx_ring.dma can be either a 32 or 64 bit value
 716          */
 717
 718         IXGB_WRITE_REG(hw, TDBAL, (tdba & 0x00000000ffffffffULL));
 719         IXGB_WRITE_REG(hw, TDBAH, (tdba >> 32));
 720
 721         IXGB_WRITE_REG(hw, TDLEN, tdlen);
 722
 723         /* Setup the HW Tx Head and Tail descriptor pointers */
 724
 725         IXGB_WRITE_REG(hw, TDH, 0);
 726         IXGB_WRITE_REG(hw, TDT, 0);
 727
 728         /* don't set up txdctl, it induces performance problems if configured
 729          * incorrectly */
 730         /* Set the Tx Interrupt Delay register */
 731
 732         IXGB_WRITE_REG(hw, TIDV, adapter->tx_int_delay);
 733
 734         /* Program the Transmit Control Register */
 735
 736         tctl = IXGB_TCTL_TCE | IXGB_TCTL_TXEN | IXGB_TCTL_TPDE;
 737         IXGB_WRITE_REG(hw, TCTL, tctl);
 738
 739         /* Setup Transmit Descriptor Settings for this adapter */
 740         adapter->tx_cmd_type =
 741                 IXGB_TX_DESC_TYPE
 742                 | (adapter->tx_int_delay_enable ? IXGB_TX_DESC_CMD_IDE : 0);
 743 }
 744
 745 /**
 746  * ixgb_setup_rx_resources - allocate Rx resources (Descriptors)
 747  * @adapter: board private structure
 748  *
 749  * Returns 0 on success, negative on failure
 750  **/
 751
 752 int
 753 ixgb_setup_rx_resources(struct ixgb_adapter *adapter)
 754 {
 755         struct ixgb_desc_ring *rxdr = &adapter->rx_ring;
 756         struct pci_dev *pdev = adapter->pdev;
 757         int size;
 758
 759         size = sizeof(struct ixgb_buffer) * rxdr->count;
 760         rxdr->buffer_info = vmalloc(size);
 761         if(!rxdr->buffer_info) {
 762                 DPRINTK(PROBE, ERR,
 763                  "Unable to allocate receive descriptor ring\n");
 764                 return -ENOMEM;
 765         }
 766         memset(rxdr->buffer_info, 0, size);
 767
 768         /* Round up to nearest 4K */
 769
 770         rxdr->size = rxdr->count * sizeof(struct ixgb_rx_desc);
 771         rxdr->size = ALIGN(rxdr->size, 4096);
 772
 773         rxdr->desc = pci_alloc_consistent(pdev, rxdr->size, &rxdr->dma);
 774
 775         if(!rxdr->desc) {
 776                 vfree(rxdr->buffer_info);
 777                 DPRINTK(PROBE, ERR,
 778                  "Unable to allocate receive descriptors\n");
 779                 return -ENOMEM;
 780         }
 781         memset(rxdr->desc, 0, rxdr->size);
 782
 783         rxdr->next_to_clean = 0;
 784         rxdr->next_to_use = 0;
 785
 786         return 0;
 787 }
 788
 789 /**
 790  * ixgb_setup_rctl - configure the receive control register
 791  * @adapter: Board private structure
 792  **/
 793
 794 static void
 795 ixgb_setup_rctl(struct ixgb_adapter *adapter)
 796 {
 797         uint32_t rctl;
 798
 799         rctl = IXGB_READ_REG(&adapter->hw, RCTL);
 800
 801         rctl &= ~(3 << IXGB_RCTL_MO_SHIFT);
 802
 803         rctl |=
 804                 IXGB_RCTL_BAM | IXGB_RCTL_RDMTS_1_2 |
 805                 IXGB_RCTL_RXEN | IXGB_RCTL_CFF |
 806                 (adapter->hw.mc_filter_type << IXGB_RCTL_MO_SHIFT);
 807
 808         rctl |= IXGB_RCTL_SECRC;
 809
 810         if (adapter->rx_buffer_len <= IXGB_RXBUFFER_2048)
 811                 rctl |= IXGB_RCTL_BSIZE_2048;
 812         else if (adapter->rx_buffer_len <= IXGB_RXBUFFER_4096)
 813                 rctl |= IXGB_RCTL_BSIZE_4096;
 814         else if (adapter->rx_buffer_len <= IXGB_RXBUFFER_8192)
 815                 rctl |= IXGB_RCTL_BSIZE_8192;
 816         else if (adapter->rx_buffer_len <= IXGB_RXBUFFER_16384)
 817                 rctl |= IXGB_RCTL_BSIZE_16384;
 818
 819         IXGB_WRITE_REG(&adapter->hw, RCTL, rctl);
 820 }
 821
 822 /**
 823  * ixgb_configure_rx - Configure 82597 Receive Unit after Reset.
 824  * @adapter: board private structure
 825  *
 826  * Configure the Rx unit of the MAC after a reset.
 827  **/
 828
 829 static void
 830 ixgb_configure_rx(struct ixgb_adapter *adapter)
 831 {
 832         uint64_t rdba = adapter->rx_ring.dma;
 833         uint32_t rdlen = adapter->rx_ring.count * sizeof(struct ixgb_rx_desc);
 834         struct ixgb_hw *hw = &adapter->hw;
 835         uint32_t rctl;
 836         uint32_t rxcsum;
 837         uint32_t rxdctl;
 838
 839         /* make sure receives are disabled while setting up the descriptors */
 840
 841         rctl = IXGB_READ_REG(hw, RCTL);
 842         IXGB_WRITE_REG(hw, RCTL, rctl & ~IXGB_RCTL_RXEN);
 843
 844         /* set the Receive Delay Timer Register */
 845
 846         IXGB_WRITE_REG(hw, RDTR, adapter->rx_int_delay);
 847
 848         /* Setup the Base and Length of the Rx Descriptor Ring */
 849
 850         IXGB_WRITE_REG(hw, RDBAL, (rdba & 0x00000000ffffffffULL));
 851         IXGB_WRITE_REG(hw, RDBAH, (rdba >> 32));
 852
 853         IXGB_WRITE_REG(hw, RDLEN, rdlen);
 854
 855         /* Setup the HW Rx Head and Tail Descriptor Pointers */
 856         IXGB_WRITE_REG(hw, RDH, 0);
 857         IXGB_WRITE_REG(hw, RDT, 0);
 858
 859         /* set up pre-fetching of receive buffers so we get some before we
 860          * run out (default hardware behavior is to run out before fetching
 861          * more).  This sets up to fetch if HTHRESH rx descriptors are avail
 862          * and the descriptors in hw cache are below PTHRESH.  This avoids
 863          * the hardware behavior of fetching <=512 descriptors in a single
 864          * burst that pre-empts all other activity, usually causing fifo
 865          * overflows. */
 866         /* use WTHRESH to burst write 16 descriptors or burst when RXT0 */
 867         rxdctl = RXDCTL_WTHRESH_DEFAULT << IXGB_RXDCTL_WTHRESH_SHIFT |
 868                  RXDCTL_HTHRESH_DEFAULT << IXGB_RXDCTL_HTHRESH_SHIFT |
 869                  RXDCTL_PTHRESH_DEFAULT << IXGB_RXDCTL_PTHRESH_SHIFT;
 870         IXGB_WRITE_REG(hw, RXDCTL, rxdctl);
 871
 872         /* Enable Receive Checksum Offload for TCP and UDP */
 873         if(adapter->rx_csum == TRUE) {
 874                 rxcsum = IXGB_READ_REG(hw, RXCSUM);
 875                 rxcsum |= IXGB_RXCSUM_TUOFL;
 876                 IXGB_WRITE_REG(hw, RXCSUM, rxcsum);
 877         }
 878
 879         /* Enable Receives */
 880
 881         IXGB_WRITE_REG(hw, RCTL, rctl);
 882 }
 883
 884 /**
 885  * ixgb_free_tx_resources - Free Tx Resources
 886  * @adapter: board private structure
 887  *
 888  * Free all transmit software resources
 889  **/
 890
 891 void
 892 ixgb_free_tx_resources(struct ixgb_adapter *adapter)
 893 {
 894         struct pci_dev *pdev = adapter->pdev;
 895
 896         ixgb_clean_tx_ring(adapter);
 897
 898         vfree(adapter->tx_ring.buffer_info);
 899         adapter->tx_ring.buffer_info = NULL;
 900
 901         pci_free_consistent(pdev, adapter->tx_ring.size,
 902                             adapter->tx_ring.desc, adapter->tx_ring.dma);
 903
 904         adapter->tx_ring.desc = NULL;
 905 }
 906
 907 static void
 908 ixgb_unmap_and_free_tx_resource(struct ixgb_adapter *adapter,
 909                                         struct ixgb_buffer *buffer_info)
 910 {
 911         struct pci_dev *pdev = adapter->pdev;
 912
 913         if (buffer_info->dma)
 914                 pci_unmap_page(pdev, buffer_info->dma, buffer_info->length,
 915                                PCI_DMA_TODEVICE);
 916
 917         if (buffer_info->skb)
 918                 dev_kfree_skb_any(buffer_info->skb);
 919
 920         buffer_info->skb = NULL;
 921         buffer_info->dma = 0;
 922         buffer_info->time_stamp = 0;
 923         /* these fields must always be initialized in tx
 924          * buffer_info->length = 0;
 925          * buffer_info->next_to_watch = 0; */
 926 }
 927
 928 /**
 929  * ixgb_clean_tx_ring - Free Tx Buffers
 930  * @adapter: board private structure
 931  **/
 932
 933 static void
 934 ixgb_clean_tx_ring(struct ixgb_adapter *adapter)
 935 {
 936         struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
 937         struct ixgb_buffer *buffer_info;
 938         unsigned long size;
 939         unsigned int i;
 940
 941         /* Free all the Tx ring sk_buffs */
 942
 943         for(i = 0; i < tx_ring->count; i++) {
 944                 buffer_info = &tx_ring->buffer_info[i];
 945                 ixgb_unmap_and_free_tx_resource(adapter, buffer_info);
 946         }
 947
 948         size = sizeof(struct ixgb_buffer) * tx_ring->count;
 949         memset(tx_ring->buffer_info, 0, size);
 950
 951         /* Zero out the descriptor ring */
 952
 953         memset(tx_ring->desc, 0, tx_ring->size);
 954
 955         tx_ring->next_to_use = 0;
 956         tx_ring->next_to_clean = 0;
 957
 958         IXGB_WRITE_REG(&adapter->hw, TDH, 0);
 959         IXGB_WRITE_REG(&adapter->hw, TDT, 0);
 960 }
 961
 962 /**
 963  * ixgb_free_rx_resources - Free Rx Resources
 964  * @adapter: board private structure
 965  *
 966  * Free all receive software resources
 967  **/
 968
 969 void
 970 ixgb_free_rx_resources(struct ixgb_adapter *adapter)
 971 {
 972         struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
 973         struct pci_dev *pdev = adapter->pdev;
 974
 975         ixgb_clean_rx_ring(adapter);
 976
 977         vfree(rx_ring->buffer_info);
 978         rx_ring->buffer_info = NULL;
 979
 980         pci_free_consistent(pdev, rx_ring->size, rx_ring->desc, rx_ring->dma);
 981
 982         rx_ring->desc = NULL;
 983 }
 984
 985 /**
 986  * ixgb_clean_rx_ring - Free Rx Buffers
 987  * @adapter: board private structure
 988  **/
 989
 990 static void
 991 ixgb_clean_rx_ring(struct ixgb_adapter *adapter)
 992 {
 993         struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
 994         struct ixgb_buffer *buffer_info;
 995         struct pci_dev *pdev = adapter->pdev;
 996         unsigned long size;
 997         unsigned int i;
 998
 999         /* Free all the Rx ring sk_buffs */
1000
1001         for(i = 0; i < rx_ring->count; i++) {
1002                 buffer_info = &rx_ring->buffer_info[i];
1003                 if(buffer_info->skb) {
1004
1005                         pci_unmap_single(pdev,
1006                                          buffer_info->dma,
1007                                          buffer_info->length,
1008                                          PCI_DMA_FROMDEVICE);
1009
1010                         dev_kfree_skb(buffer_info->skb);
1011
1012                         buffer_info->skb = NULL;
1013                 }
1014         }
1015
1016         size = sizeof(struct ixgb_buffer) * rx_ring->count;
1017         memset(rx_ring->buffer_info, 0, size);
1018
1019         /* Zero out the descriptor ring */
1020
1021         memset(rx_ring->desc, 0, rx_ring->size);
1022
1023         rx_ring->next_to_clean = 0;
1024         rx_ring->next_to_use = 0;
1025
1026         IXGB_WRITE_REG(&adapter->hw, RDH, 0);
1027         IXGB_WRITE_REG(&adapter->hw, RDT, 0);
1028 }
1029
1030 /**
1031  * ixgb_set_mac - Change the Ethernet Address of the NIC
1032  * @netdev: network interface device structure
1033  * @p: pointer to an address structure
1034  *
1035  * Returns 0 on success, negative on failure
1036  **/
1037
1038 static int
1039 ixgb_set_mac(struct net_device *netdev, void *p)
1040 {
1041         struct ixgb_adapter *adapter = netdev_priv(netdev);
1042         struct sockaddr *addr = p;
1043
1044         if(!is_valid_ether_addr(addr->sa_data))
1045                 return -EADDRNOTAVAIL;
1046
1047         memcpy(netdev->dev_addr, addr->sa_data, netdev->addr_len);
1048
1049         ixgb_rar_set(&adapter->hw, addr->sa_data, 0);
1050
1051         return 0;
1052 }
1053
1054 /**
1055  * ixgb_set_multi - Multicast and Promiscuous mode set
1056  * @netdev: network interface device structure
1057  *
1058  * The set_multi entry point is called whenever the multicast address
1059  * list or the network interface flags are updated.  This routine is
1060  * responsible for configuring the hardware for proper multicast,
1061  * promiscuous mode, and all-multi behavior.
1062  **/
1063
1064 static void
1065 ixgb_set_multi(struct net_device *netdev)
1066 {
1067         struct ixgb_adapter *adapter = netdev_priv(netdev);
1068         struct ixgb_hw *hw = &adapter->hw;
1069         struct dev_mc_list *mc_ptr;
1070         uint32_t rctl;
1071         int i;
1072
1073         /* Check for Promiscuous and All Multicast modes */
1074
1075         rctl = IXGB_READ_REG(hw, RCTL);
1076
1077         if(netdev->flags & IFF_PROMISC) {
1078                 rctl |= (IXGB_RCTL_UPE | IXGB_RCTL_MPE);
1079         } else if(netdev->flags & IFF_ALLMULTI) {
1080                 rctl |= IXGB_RCTL_MPE;
1081                 rctl &= ~IXGB_RCTL_UPE;
1082         } else {
1083                 rctl &= ~(IXGB_RCTL_UPE | IXGB_RCTL_MPE);
1084         }
1085
1086         if(netdev->mc_count > IXGB_MAX_NUM_MULTICAST_ADDRESSES) {
1087                 rctl |= IXGB_RCTL_MPE;
1088                 IXGB_WRITE_REG(hw, RCTL, rctl);
1089         } else {
1090                 uint8_t mta[netdev->mc_count * IXGB_ETH_LENGTH_OF_ADDRESS];
1091
1092                 IXGB_WRITE_REG(hw, RCTL, rctl);
1093
1094                 for(i = 0, mc_ptr = netdev->mc_list; mc_ptr;
1095                         i++, mc_ptr = mc_ptr->next)
1096                         memcpy(&mta[i * IXGB_ETH_LENGTH_OF_ADDRESS],
1097                                    mc_ptr->dmi_addr, IXGB_ETH_LENGTH_OF_ADDRESS);
1098
1099                 ixgb_mc_addr_list_update(hw, mta, netdev->mc_count, 0);
1100         }
1101 }
1102
1103 /**
1104  * ixgb_watchdog - Timer Call-back
1105  * @data: pointer to netdev cast into an unsigned long
1106  **/
1107
1108 static void
1109 ixgb_watchdog(unsigned long data)
1110 {
1111         struct ixgb_adapter *adapter = (struct ixgb_adapter *)data;
1112         struct net_device *netdev = adapter->netdev;
1113         struct ixgb_desc_ring *txdr = &adapter->tx_ring;
1114
1115         ixgb_check_for_link(&adapter->hw);
1116
1117         if (ixgb_check_for_bad_link(&adapter->hw)) {
1118                 /* force the reset path */
1119                 netif_stop_queue(netdev);
1120         }
1121
1122         if(adapter->hw.link_up) {
1123                 if(!netif_carrier_ok(netdev)) {
1124                         DPRINTK(LINK, INFO,
1125                                 "NIC Link is Up 10000 Mbps Full Duplex\n");
1126                         adapter->link_speed = 10000;
1127                         adapter->link_duplex = FULL_DUPLEX;
1128                         netif_carrier_on(netdev);
1129                         netif_wake_queue(netdev);
1130                 }
1131         } else {
1132                 if(netif_carrier_ok(netdev)) {
1133                         adapter->link_speed = 0;
1134                         adapter->link_duplex = 0;
1135                         DPRINTK(LINK, INFO, "NIC Link is Down\n");
1136                         netif_carrier_off(netdev);
1137                         netif_stop_queue(netdev);
1138
1139                 }
1140         }
1141
1142         ixgb_update_stats(adapter);
1143
1144         if(!netif_carrier_ok(netdev)) {
1145                 if(IXGB_DESC_UNUSED(txdr) + 1 < txdr->count) {
1146                         /* We've lost link, so the controller stops DMA,
1147                          * but we've got queued Tx work that's never going
1148                          * to get done, so reset controller to flush Tx.
1149                          * (Do the reset outside of interrupt context). */
1150                         schedule_work(&adapter->tx_timeout_task);
1151                 }
1152         }
1153
1154         /* Force detection of hung controller every watchdog period */
1155         adapter->detect_tx_hung = TRUE;
1156
1157         /* generate an interrupt to force clean up of any stragglers */
1158         IXGB_WRITE_REG(&adapter->hw, ICS, IXGB_INT_TXDW);
1159
1160         /* Reset the timer */
1161         mod_timer(&adapter->watchdog_timer, jiffies + 2 * HZ);
1162 }
1163
1164 #define IXGB_TX_FLAGS_CSUM              0x00000001
1165 #define IXGB_TX_FLAGS_VLAN              0x00000002
1166 #define IXGB_TX_FLAGS_TSO               0x00000004
1167
1168 static int
1169 ixgb_tso(struct ixgb_adapter *adapter, struct sk_buff *skb)
1170 {
1171         struct ixgb_context_desc *context_desc;
1172         unsigned int i;
1173         uint8_t ipcss, ipcso, tucss, tucso, hdr_len;
1174         uint16_t ipcse, tucse, mss;
1175         int err;
1176
1177         if (likely(skb_is_gso(skb))) {
1178                 struct ixgb_buffer *buffer_info;
1179                 struct iphdr *iph;
1180
1181                 if (skb_header_cloned(skb)) {
1182                         err = pskb_expand_head(skb, 0, 0, GFP_ATOMIC);
1183                         if (err)
1184                                 return err;
1185                 }
1186
1187                 hdr_len = skb_transport_offset(skb) + tcp_hdrlen(skb);
1188                 mss = skb_shinfo(skb)->gso_size;
1189                 iph = ip_hdr(skb);
1190                 iph->tot_len = 0;
1191                 iph->check = 0;
1192                 tcp_hdr(skb)->check = ~csum_tcpudp_magic(iph->saddr,
1193                                                          iph->daddr, 0,
1194                                                          IPPROTO_TCP, 0);
1195                 ipcss = skb_network_offset(skb);
1196                 ipcso = (void *)&(iph->check) - (void *)skb->data;
1197                 ipcse = skb_transport_offset(skb) - 1;
1198                 tucss = skb_transport_offset(skb);
1199                 tucso = (void *)&(tcp_hdr(skb)->check) - (void *)skb->data;
1200                 tucse = 0;
1201
1202                 i = adapter->tx_ring.next_to_use;
1203                 context_desc = IXGB_CONTEXT_DESC(adapter->tx_ring, i);
1204                 buffer_info = &adapter->tx_ring.buffer_info[i];
1205                 WARN_ON(buffer_info->dma != 0);
1206
1207                 context_desc->ipcss = ipcss;
1208                 context_desc->ipcso = ipcso;
1209                 context_desc->ipcse = cpu_to_le16(ipcse);
1210                 context_desc->tucss = tucss;
1211                 context_desc->tucso = tucso;
1212                 context_desc->tucse = cpu_to_le16(tucse);
1213                 context_desc->mss = cpu_to_le16(mss);
1214                 context_desc->hdr_len = hdr_len;
1215                 context_desc->status = 0;
1216                 context_desc->cmd_type_len = cpu_to_le32(
1217                                                   IXGB_CONTEXT_DESC_TYPE
1218                                                 | IXGB_CONTEXT_DESC_CMD_TSE
1219                                                 | IXGB_CONTEXT_DESC_CMD_IP
1220                                                 | IXGB_CONTEXT_DESC_CMD_TCP
1221                                                 | IXGB_CONTEXT_DESC_CMD_IDE
1222                                                 | (skb->len - (hdr_len)));
1223
1224
1225                 if(++i == adapter->tx_ring.count) i = 0;
1226                 adapter->tx_ring.next_to_use = i;
1227
1228                 return 1;
1229         }
1230
1231         return 0;
1232 }
1233
1234 static boolean_t
1235 ixgb_tx_csum(struct ixgb_adapter *adapter, struct sk_buff *skb)
1236 {
1237         struct ixgb_context_desc *context_desc;
1238         unsigned int i;
1239         uint8_t css, cso;
1240
1241         if(likely(skb->ip_summed == CHECKSUM_PARTIAL)) {
1242                 struct ixgb_buffer *buffer_info;
1243                 css = skb_transport_offset(skb);
1244                 cso = css + skb->csum_offset;
1245
1246                 i = adapter->tx_ring.next_to_use;
1247                 context_desc = IXGB_CONTEXT_DESC(adapter->tx_ring, i);
1248                 buffer_info = &adapter->tx_ring.buffer_info[i];
1249                 WARN_ON(buffer_info->dma != 0);
1250
1251                 context_desc->tucss = css;
1252                 context_desc->tucso = cso;
1253                 context_desc->tucse = 0;
1254                 /* zero out any previously existing data in one instruction */
1255                 *(uint32_t *)&(context_desc->ipcss) = 0;
1256                 context_desc->status = 0;
1257                 context_desc->hdr_len = 0;
1258                 context_desc->mss = 0;
1259                 context_desc->cmd_type_len =
1260                         cpu_to_le32(IXGB_CONTEXT_DESC_TYPE
1261                                     | IXGB_TX_DESC_CMD_IDE);
1262
1263                 if(++i == adapter->tx_ring.count) i = 0;
1264                 adapter->tx_ring.next_to_use = i;
1265
1266                 return TRUE;
1267         }
1268
1269         return FALSE;
1270 }
1271
1272 #define IXGB_MAX_TXD_PWR        14
1273 #define IXGB_MAX_DATA_PER_TXD   (1<<IXGB_MAX_TXD_PWR)
1274
1275 static int
1276 ixgb_tx_map(struct ixgb_adapter *adapter, struct sk_buff *skb,
1277             unsigned int first)
1278 {
1279         struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
1280         struct ixgb_buffer *buffer_info;
1281         int len = skb->len;
1282         unsigned int offset = 0, size, count = 0, i;
1283         unsigned int mss = skb_shinfo(skb)->gso_size;
1284
1285         unsigned int nr_frags = skb_shinfo(skb)->nr_frags;
1286         unsigned int f;
1287
1288         len -= skb->data_len;
1289
1290         i = tx_ring->next_to_use;
1291
1292         while(len) {
1293                 buffer_info = &tx_ring->buffer_info[i];
1294                 size = min(len, IXGB_MAX_DATA_PER_TXD);
1295                 /* Workaround for premature desc write-backs
1296                  * in TSO mode.  Append 4-byte sentinel desc */
1297                 if (unlikely(mss && !nr_frags && size == len && size > 8))
1298                         size -= 4;
1299
1300                 buffer_info->length = size;
1301                 WARN_ON(buffer_info->dma != 0);
1302                 buffer_info->dma =
1303                         pci_map_single(adapter->pdev,
1304                                 skb->data + offset,
1305                                 size,
1306                                 PCI_DMA_TODEVICE);
1307                 buffer_info->time_stamp = jiffies;
1308                 buffer_info->next_to_watch = 0;
1309
1310                 len -= size;
1311                 offset += size;
1312                 count++;
1313                 if(++i == tx_ring->count) i = 0;
1314         }
1315
1316         for(f = 0; f < nr_frags; f++) {
1317                 struct skb_frag_struct *frag;
1318
1319                 frag = &skb_shinfo(skb)->frags[f];
1320                 len = frag->size;
1321                 offset = 0;
1322
1323                 while(len) {
1324                         buffer_info = &tx_ring->buffer_info[i];
1325                         size = min(len, IXGB_MAX_DATA_PER_TXD);
1326
1327                         /* Workaround for premature desc write-backs
1328                          * in TSO mode.  Append 4-byte sentinel desc */
1329                         if (unlikely(mss && !nr_frags && size == len
1330                                      && size > 8))
1331                                 size -= 4;
1332
1333                         buffer_info->length = size;
1334                         buffer_info->dma =
1335                                 pci_map_page(adapter->pdev,
1336                                         frag->page,
1337                                         frag->page_offset + offset,
1338                                         size,
1339                                         PCI_DMA_TODEVICE);
1340                         buffer_info->time_stamp = jiffies;
1341                         buffer_info->next_to_watch = 0;
1342
1343                         len -= size;
1344                         offset += size;
1345                         count++;
1346                         if(++i == tx_ring->count) i = 0;
1347                 }
1348         }
1349         i = (i == 0) ? tx_ring->count - 1 : i - 1;
1350         tx_ring->buffer_info[i].skb = skb;
1351         tx_ring->buffer_info[first].next_to_watch = i;
1352
1353         return count;
1354 }
1355
1356 static void
1357 ixgb_tx_queue(struct ixgb_adapter *adapter, int count, int vlan_id,int tx_flags)
1358 {
1359         struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
1360         struct ixgb_tx_desc *tx_desc = NULL;
1361         struct ixgb_buffer *buffer_info;
1362         uint32_t cmd_type_len = adapter->tx_cmd_type;
1363         uint8_t status = 0;
1364         uint8_t popts = 0;
1365         unsigned int i;
1366
1367         if(tx_flags & IXGB_TX_FLAGS_TSO) {
1368                 cmd_type_len |= IXGB_TX_DESC_CMD_TSE;
1369                 popts |= (IXGB_TX_DESC_POPTS_IXSM | IXGB_TX_DESC_POPTS_TXSM);
1370         }
1371
1372         if(tx_flags & IXGB_TX_FLAGS_CSUM)
1373                 popts |= IXGB_TX_DESC_POPTS_TXSM;
1374
1375         if(tx_flags & IXGB_TX_FLAGS_VLAN) {
1376                 cmd_type_len |= IXGB_TX_DESC_CMD_VLE;
1377         }
1378
1379         i = tx_ring->next_to_use;
1380
1381         while(count--) {
1382                 buffer_info = &tx_ring->buffer_info[i];
1383                 tx_desc = IXGB_TX_DESC(*tx_ring, i);
1384                 tx_desc->buff_addr = cpu_to_le64(buffer_info->dma);
1385                 tx_desc->cmd_type_len =
1386                         cpu_to_le32(cmd_type_len | buffer_info->length);
1387                 tx_desc->status = status;
1388                 tx_desc->popts = popts;
1389                 tx_desc->vlan = cpu_to_le16(vlan_id);
1390
1391                 if(++i == tx_ring->count) i = 0;
1392         }
1393
1394         tx_desc->cmd_type_len |= cpu_to_le32(IXGB_TX_DESC_CMD_EOP
1395                                 | IXGB_TX_DESC_CMD_RS );
1396
1397         /* Force memory writes to complete before letting h/w
1398          * know there are new descriptors to fetch.  (Only
1399          * applicable for weak-ordered memory model archs,
1400          * such as IA-64). */
1401         wmb();
1402
1403         tx_ring->next_to_use = i;
1404         IXGB_WRITE_REG(&adapter->hw, TDT, i);
1405 }
1406
1407 static int __ixgb_maybe_stop_tx(struct net_device *netdev, int size)
1408 {
1409         struct ixgb_adapter *adapter = netdev_priv(netdev);
1410         struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
1411
1412         netif_stop_queue(netdev);
1413         /* Herbert's original patch had:
1414          *  smp_mb__after_netif_stop_queue();
1415          * but since that doesn't exist yet, just open code it. */
1416         smp_mb();
1417
1418         /* We need to check again in a case another CPU has just
1419          * made room available. */
1420         if (likely(IXGB_DESC_UNUSED(tx_ring) < size))
1421                 return -EBUSY;
1422
1423         /* A reprieve! */
1424         netif_start_queue(netdev);
1425         ++adapter->restart_queue;
1426         return 0;
1427 }
1428
1429 static int ixgb_maybe_stop_tx(struct net_device *netdev,
1430                               struct ixgb_desc_ring *tx_ring, int size)
1431 {
1432         if (likely(IXGB_DESC_UNUSED(tx_ring) >= size))
1433                 return 0;
1434         return __ixgb_maybe_stop_tx(netdev, size);
1435 }
1436
1437
1438 /* Tx Descriptors needed, worst case */
1439 #define TXD_USE_COUNT(S) (((S) >> IXGB_MAX_TXD_PWR) + \
1440                          (((S) & (IXGB_MAX_DATA_PER_TXD - 1)) ? 1 : 0))
1441 #define DESC_NEEDED TXD_USE_COUNT(IXGB_MAX_DATA_PER_TXD) /* skb->date */ + \
1442         MAX_SKB_FRAGS * TXD_USE_COUNT(PAGE_SIZE) + 1 /* for context */ \
1443         + 1 /* one more needed for sentinel TSO workaround */
1444
1445 static int
1446 ixgb_xmit_frame(struct sk_buff *skb, struct net_device *netdev)
1447 {
1448         struct ixgb_adapter *adapter = netdev_priv(netdev);
1449         unsigned int first;
1450         unsigned int tx_flags = 0;
1451         unsigned long flags;
1452         int vlan_id = 0;
1453         int tso;
1454
1455         if(skb->len <= 0) {
1456                 dev_kfree_skb_any(skb);
1457                 return 0;
1458         }
1459
1460 #ifdef NETIF_F_LLTX
1461         local_irq_save(flags);
1462         if (!spin_trylock(&adapter->tx_lock)) {
1463                 /* Collision - tell upper layer to requeue */
1464                 local_irq_restore(flags);
1465                 return NETDEV_TX_LOCKED;
1466         }
1467 #else
1468         spin_lock_irqsave(&adapter->tx_lock, flags);
1469 #endif
1470
1471         if (unlikely(ixgb_maybe_stop_tx(netdev, &adapter->tx_ring,
1472                      DESC_NEEDED))) {
1473                 netif_stop_queue(netdev);
1474                 spin_unlock_irqrestore(&adapter->tx_lock, flags);
1475                 return NETDEV_TX_BUSY;
1476         }
1477
1478 #ifndef NETIF_F_LLTX
1479         spin_unlock_irqrestore(&adapter->tx_lock, flags);
1480 #endif
1481
1482         if(adapter->vlgrp && vlan_tx_tag_present(skb)) {
1483                 tx_flags |= IXGB_TX_FLAGS_VLAN;
1484                 vlan_id = vlan_tx_tag_get(skb);
1485         }
1486
1487         first = adapter->tx_ring.next_to_use;
1488
1489         tso = ixgb_tso(adapter, skb);
1490         if (tso < 0) {
1491                 dev_kfree_skb_any(skb);
1492 #ifdef NETIF_F_LLTX
1493                 spin_unlock_irqrestore(&adapter->tx_lock, flags);
1494 #endif
1495                 return NETDEV_TX_OK;
1496         }
1497
1498         if (likely(tso))
1499                 tx_flags |= IXGB_TX_FLAGS_TSO;
1500         else if(ixgb_tx_csum(adapter, skb))
1501                 tx_flags |= IXGB_TX_FLAGS_CSUM;
1502
1503         ixgb_tx_queue(adapter, ixgb_tx_map(adapter, skb, first), vlan_id,
1504                         tx_flags);
1505
1506         netdev->trans_start = jiffies;
1507
1508 #ifdef NETIF_F_LLTX
1509         /* Make sure there is space in the ring for the next send. */
1510         ixgb_maybe_stop_tx(netdev, &adapter->tx_ring, DESC_NEEDED);
1511
1512         spin_unlock_irqrestore(&adapter->tx_lock, flags);
1513
1514 #endif
1515         return NETDEV_TX_OK;
1516 }
1517
1518 /**
1519  * ixgb_tx_timeout - Respond to a Tx Hang
1520  * @netdev: network interface device structure
1521  **/
1522
1523 static void
1524 ixgb_tx_timeout(struct net_device *netdev)
1525 {
1526         struct ixgb_adapter *adapter = netdev_priv(netdev);
1527
1528         /* Do the reset outside of interrupt context */
1529         schedule_work(&adapter->tx_timeout_task);
1530 }
1531
1532 static void
1533 ixgb_tx_timeout_task(struct work_struct *work)
1534 {
1535         struct ixgb_adapter *adapter =
1536                 container_of(work, struct ixgb_adapter, tx_timeout_task);
1537
1538         adapter->tx_timeout_count++;
1539         ixgb_down(adapter, TRUE);
1540         ixgb_up(adapter);
1541 }
1542
1543 /**
1544  * ixgb_get_stats - Get System Network Statistics
1545  * @netdev: network interface device structure
1546  *
1547  * Returns the address of the device statistics structure.
1548  * The statistics are actually updated from the timer callback.
1549  **/
1550
1551 static struct net_device_stats *
1552 ixgb_get_stats(struct net_device *netdev)
1553 {
1554         struct ixgb_adapter *adapter = netdev_priv(netdev);
1555
1556         return &adapter->net_stats;
1557 }
1558
1559 /**
1560  * ixgb_change_mtu - Change the Maximum Transfer Unit
1561  * @netdev: network interface device structure
1562  * @new_mtu: new value for maximum frame size
1563  *
1564  * Returns 0 on success, negative on failure
1565  **/
1566
1567 static int
1568 ixgb_change_mtu(struct net_device *netdev, int new_mtu)
1569 {
1570         struct ixgb_adapter *adapter = netdev_priv(netdev);
1571         int max_frame = new_mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;
1572         int old_max_frame = netdev->mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;
1573
1574
1575         if((max_frame < IXGB_MIN_ENET_FRAME_SIZE_WITHOUT_FCS + ENET_FCS_LENGTH)
1576            || (max_frame > IXGB_MAX_JUMBO_FRAME_SIZE + ENET_FCS_LENGTH)) {
1577                 DPRINTK(PROBE, ERR, "Invalid MTU setting %d\n", new_mtu);
1578                 return -EINVAL;
1579         }
1580
1581         adapter->rx_buffer_len = max_frame;
1582
1583         netdev->mtu = new_mtu;
1584
1585         if ((old_max_frame != max_frame) && netif_running(netdev)) {
1586                 ixgb_down(adapter, TRUE);
1587                 ixgb_up(adapter);
1588         }
1589
1590         return 0;
1591 }
1592
1593 /**
1594  * ixgb_update_stats - Update the board statistics counters.
1595  * @adapter: board private structure
1596  **/
1597
1598 void
1599 ixgb_update_stats(struct ixgb_adapter *adapter)
1600 {
1601         struct net_device *netdev = adapter->netdev;
1602         struct pci_dev *pdev = adapter->pdev;
1603
1604         /* Prevent stats update while adapter is being reset */
1605         if (pci_channel_offline(pdev))
1606                 return;
1607
1608         if((netdev->flags & IFF_PROMISC) || (netdev->flags & IFF_ALLMULTI) ||
1609            (netdev->mc_count > IXGB_MAX_NUM_MULTICAST_ADDRESSES)) {
1610                 u64 multi = IXGB_READ_REG(&adapter->hw, MPRCL);
1611                 u32 bcast_l = IXGB_READ_REG(&adapter->hw, BPRCL);
1612                 u32 bcast_h = IXGB_READ_REG(&adapter->hw, BPRCH);
1613                 u64 bcast = ((u64)bcast_h << 32) | bcast_l;
1614
1615                 multi |= ((u64)IXGB_READ_REG(&adapter->hw, MPRCH) << 32);
1616                 /* fix up multicast stats by removing broadcasts */
1617                 if(multi >= bcast)
1618                         multi -= bcast;
1619
1620                 adapter->stats.mprcl += (multi & 0xFFFFFFFF);
1621                 adapter->stats.mprch += (multi >> 32);
1622                 adapter->stats.bprcl += bcast_l;
1623                 adapter->stats.bprch += bcast_h;
1624         } else {
1625                 adapter->stats.mprcl += IXGB_READ_REG(&adapter->hw, MPRCL);
1626                 adapter->stats.mprch += IXGB_READ_REG(&adapter->hw, MPRCH);
1627                 adapter->stats.bprcl += IXGB_READ_REG(&adapter->hw, BPRCL);
1628                 adapter->stats.bprch += IXGB_READ_REG(&adapter->hw, BPRCH);
1629         }
1630         adapter->stats.tprl += IXGB_READ_REG(&adapter->hw, TPRL);
1631         adapter->stats.tprh += IXGB_READ_REG(&adapter->hw, TPRH);
1632         adapter->stats.gprcl += IXGB_READ_REG(&adapter->hw, GPRCL);
1633         adapter->stats.gprch += IXGB_READ_REG(&adapter->hw, GPRCH);
1634         adapter->stats.uprcl += IXGB_READ_REG(&adapter->hw, UPRCL);
1635         adapter->stats.uprch += IXGB_READ_REG(&adapter->hw, UPRCH);
1636         adapter->stats.vprcl += IXGB_READ_REG(&adapter->hw, VPRCL);
1637         adapter->stats.vprch += IXGB_READ_REG(&adapter->hw, VPRCH);
1638         adapter->stats.jprcl += IXGB_READ_REG(&adapter->hw, JPRCL);
1639         adapter->stats.jprch += IXGB_READ_REG(&adapter->hw, JPRCH);
1640         adapter->stats.gorcl += IXGB_READ_REG(&adapter->hw, GORCL);
1641         adapter->stats.gorch += IXGB_READ_REG(&adapter->hw, GORCH);
1642         adapter->stats.torl += IXGB_READ_REG(&adapter->hw, TORL);
1643         adapter->stats.torh += IXGB_READ_REG(&adapter->hw, TORH);
1644         adapter->stats.rnbc += IXGB_READ_REG(&adapter->hw, RNBC);
1645         adapter->stats.ruc += IXGB_READ_REG(&adapter->hw, RUC);
1646         adapter->stats.roc += IXGB_READ_REG(&adapter->hw, ROC);
1647         adapter->stats.rlec += IXGB_READ_REG(&adapter->hw, RLEC);
1648         adapter->stats.crcerrs += IXGB_READ_REG(&adapter->hw, CRCERRS);
1649         adapter->stats.icbc += IXGB_READ_REG(&adapter->hw, ICBC);
1650         adapter->stats.ecbc += IXGB_READ_REG(&adapter->hw, ECBC);
1651         adapter->stats.mpc += IXGB_READ_REG(&adapter->hw, MPC);
1652         adapter->stats.tptl += IXGB_READ_REG(&adapter->hw, TPTL);
1653         adapter->stats.tpth += IXGB_READ_REG(&adapter->hw, TPTH);
1654         adapter->stats.gptcl += IXGB_READ_REG(&adapter->hw, GPTCL);
1655         adapter->stats.gptch += IXGB_READ_REG(&adapter->hw, GPTCH);
1656         adapter->stats.bptcl += IXGB_READ_REG(&adapter->hw, BPTCL);
1657         adapter->stats.bptch += IXGB_READ_REG(&adapter->hw, BPTCH);
1658         adapter->stats.mptcl += IXGB_READ_REG(&adapter->hw, MPTCL);
1659         adapter->stats.mptch += IXGB_READ_REG(&adapter->hw, MPTCH);
1660         adapter->stats.uptcl += IXGB_READ_REG(&adapter->hw, UPTCL);
1661         adapter->stats.uptch += IXGB_READ_REG(&adapter->hw, UPTCH);
1662         adapter->stats.vptcl += IXGB_READ_REG(&adapter->hw, VPTCL);
1663         adapter->stats.vptch += IXGB_READ_REG(&adapter->hw, VPTCH);
1664         adapter->stats.jptcl += IXGB_READ_REG(&adapter->hw, JPTCL);
1665         adapter->stats.jptch += IXGB_READ_REG(&adapter->hw, JPTCH);
1666         adapter->stats.gotcl += IXGB_READ_REG(&adapter->hw, GOTCL);
1667         adapter->stats.gotch += IXGB_READ_REG(&adapter->hw, GOTCH);
1668         adapter->stats.totl += IXGB_READ_REG(&adapter->hw, TOTL);
1669         adapter->stats.toth += IXGB_READ_REG(&adapter->hw, TOTH);
1670         adapter->stats.dc += IXGB_READ_REG(&adapter->hw, DC);
1671         adapter->stats.plt64c += IXGB_READ_REG(&adapter->hw, PLT64C);
1672         adapter->stats.tsctc += IXGB_READ_REG(&adapter->hw, TSCTC);
1673         adapter->stats.tsctfc += IXGB_READ_REG(&adapter->hw, TSCTFC);
1674         adapter->stats.ibic += IXGB_READ_REG(&adapter->hw, IBIC);
1675         adapter->stats.rfc += IXGB_READ_REG(&adapter->hw, RFC);
1676         adapter->stats.lfc += IXGB_READ_REG(&adapter->hw, LFC);
1677         adapter->stats.pfrc += IXGB_READ_REG(&adapter->hw, PFRC);
1678         adapter->stats.pftc += IXGB_READ_REG(&adapter->hw, PFTC);
1679         adapter->stats.mcfrc += IXGB_READ_REG(&adapter->hw, MCFRC);
1680         adapter->stats.mcftc += IXGB_READ_REG(&adapter->hw, MCFTC);
1681         adapter->stats.xonrxc += IXGB_READ_REG(&adapter->hw, XONRXC);
1682         adapter->stats.xontxc += IXGB_READ_REG(&adapter->hw, XONTXC);
1683         adapter->stats.xoffrxc += IXGB_READ_REG(&adapter->hw, XOFFRXC);
1684         adapter->stats.xofftxc += IXGB_READ_REG(&adapter->hw, XOFFTXC);
1685         adapter->stats.rjc += IXGB_READ_REG(&adapter->hw, RJC);
1686
1687         /* Fill out the OS statistics structure */
1688
1689         adapter->net_stats.rx_packets = adapter->stats.gprcl;
1690         adapter->net_stats.tx_packets = adapter->stats.gptcl;
1691         adapter->net_stats.rx_bytes = adapter->stats.gorcl;
1692         adapter->net_stats.tx_bytes = adapter->stats.gotcl;
1693         adapter->net_stats.multicast = adapter->stats.mprcl;
1694         adapter->net_stats.collisions = 0;
1695
1696         /* ignore RLEC as it reports errors for padded (<64bytes) frames
1697          * with a length in the type/len field */
1698         adapter->net_stats.rx_errors =
1699             /* adapter->stats.rnbc + */ adapter->stats.crcerrs +
1700             adapter->stats.ruc +
1701             adapter->stats.roc /*+ adapter->stats.rlec */  +
1702             adapter->stats.icbc +
1703             adapter->stats.ecbc + adapter->stats.mpc;
1704
1705         /* see above
1706          * adapter->net_stats.rx_length_errors = adapter->stats.rlec;
1707          */
1708
1709         adapter->net_stats.rx_crc_errors = adapter->stats.crcerrs;
1710         adapter->net_stats.rx_fifo_errors = adapter->stats.mpc;
1711         adapter->net_stats.rx_missed_errors = adapter->stats.mpc;
1712         adapter->net_stats.rx_over_errors = adapter->stats.mpc;
1713
1714         adapter->net_stats.tx_errors = 0;
1715         adapter->net_stats.rx_frame_errors = 0;
1716         adapter->net_stats.tx_aborted_errors = 0;
1717         adapter->net_stats.tx_carrier_errors = 0;
1718         adapter->net_stats.tx_fifo_errors = 0;
1719         adapter->net_stats.tx_heartbeat_errors = 0;
1720         adapter->net_stats.tx_window_errors = 0;
1721 }
1722
1723 #define IXGB_MAX_INTR 10
1724 /**
1725  * ixgb_intr - Interrupt Handler
1726  * @irq: interrupt number
1727  * @data: pointer to a network interface device structure
1728  **/
1729
1730 static irqreturn_t
1731 ixgb_intr(int irq, void *data)
1732 {
1733         struct net_device *netdev = data;
1734         struct ixgb_adapter *adapter = netdev_priv(netdev);
1735         struct ixgb_hw *hw = &adapter->hw;
1736         uint32_t icr = IXGB_READ_REG(hw, ICR);
1737 #ifndef CONFIG_IXGB_NAPI
1738         unsigned int i;
1739 #endif
1740
1741         if(unlikely(!icr))
1742                 return IRQ_NONE;  /* Not our interrupt */
1743
1744         if(unlikely(icr & (IXGB_INT_RXSEQ | IXGB_INT_LSC))) {
1745                 mod_timer(&adapter->watchdog_timer, jiffies);
1746         }
1747
1748 #ifdef CONFIG_IXGB_NAPI
1749         if(netif_rx_schedule_prep(netdev)) {
1750
1751                 /* Disable interrupts and register for poll. The flush
1752                   of the posted write is intentionally left out.
1753                 */
1754
1755                 atomic_inc(&adapter->irq_sem);
1756                 IXGB_WRITE_REG(&adapter->hw, IMC, ~0);
1757                 __netif_rx_schedule(netdev);
1758         }
1759 #else
1760         /* yes, that is actually a & and it is meant to make sure that
1761          * every pass through this for loop checks both receive and
1762          * transmit queues for completed descriptors, intended to
1763          * avoid starvation issues and assist tx/rx fairness. */
1764         for(i = 0; i < IXGB_MAX_INTR; i++)
1765                 if(!ixgb_clean_rx_irq(adapter) &
1766                    !ixgb_clean_tx_irq(adapter))
1767                         break;
1768 #endif
1769         return IRQ_HANDLED;
1770 }
1771
1772 #ifdef CONFIG_IXGB_NAPI
1773 /**
1774  * ixgb_clean - NAPI Rx polling callback
1775  * @adapter: board private structure
1776  **/
1777
1778 static int
1779 ixgb_clean(struct net_device *netdev, int *budget)
1780 {
1781         struct ixgb_adapter *adapter = netdev_priv(netdev);
1782         int work_to_do = min(*budget, netdev->quota);
1783         int tx_cleaned;
1784         int work_done = 0;
1785
1786         tx_cleaned = ixgb_clean_tx_irq(adapter);
1787         ixgb_clean_rx_irq(adapter, &work_done, work_to_do);
1788
1789         *budget -= work_done;
1790         netdev->quota -= work_done;
1791
1792         /* if no Tx and not enough Rx work done, exit the polling mode */
1793         if((!tx_cleaned && (work_done == 0)) || !netif_running(netdev)) {
1794                 netif_rx_complete(netdev);
1795                 ixgb_irq_enable(adapter);
1796                 return 0;
1797         }
1798
1799         return 1;
1800 }
1801 #endif
1802
1803 /**
1804  * ixgb_clean_tx_irq - Reclaim resources after transmit completes
1805  * @adapter: board private structure
1806  **/
1807
1808 static boolean_t
1809 ixgb_clean_tx_irq(struct ixgb_adapter *adapter)
1810 {
1811         struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
1812         struct net_device *netdev = adapter->netdev;
1813         struct ixgb_tx_desc *tx_desc, *eop_desc;
1814         struct ixgb_buffer *buffer_info;
1815         unsigned int i, eop;
1816         boolean_t cleaned = FALSE;
1817
1818         i = tx_ring->next_to_clean;
1819         eop = tx_ring->buffer_info[i].next_to_watch;
1820         eop_desc = IXGB_TX_DESC(*tx_ring, eop);
1821
1822         while(eop_desc->status & IXGB_TX_DESC_STATUS_DD) {
1823
1824                 for(cleaned = FALSE; !cleaned; ) {
1825                         tx_desc = IXGB_TX_DESC(*tx_ring, i);
1826                         buffer_info = &tx_ring->buffer_info[i];
1827
1828                         if (tx_desc->popts
1829                             & (IXGB_TX_DESC_POPTS_TXSM |
1830                                IXGB_TX_DESC_POPTS_IXSM))
1831                                 adapter->hw_csum_tx_good++;
1832
1833                         ixgb_unmap_and_free_tx_resource(adapter, buffer_info);
1834
1835                         *(uint32_t *)&(tx_desc->status) = 0;
1836
1837                         cleaned = (i == eop);
1838                         if(++i == tx_ring->count) i = 0;
1839                 }
1840
1841                 eop = tx_ring->buffer_info[i].next_to_watch;
1842                 eop_desc = IXGB_TX_DESC(*tx_ring, eop);
1843         }
1844
1845         tx_ring->next_to_clean = i;
1846
1847         if (unlikely(netif_queue_stopped(netdev))) {
1848                 spin_lock(&adapter->tx_lock);
1849                 if (netif_queue_stopped(netdev) && netif_carrier_ok(netdev) &&
1850                     (IXGB_DESC_UNUSED(tx_ring) >= DESC_NEEDED))
1851                         netif_wake_queue(netdev);
1852                 spin_unlock(&adapter->tx_lock);
1853         }
1854
1855         if(adapter->detect_tx_hung) {
1856                 /* detect a transmit hang in hardware, this serializes the
1857                  * check with the clearing of time_stamp and movement of i */
1858                 adapter->detect_tx_hung = FALSE;
1859                 if (tx_ring->buffer_info[eop].dma &&
1860                    time_after(jiffies, tx_ring->buffer_info[eop].time_stamp + HZ)
1861                    && !(IXGB_READ_REG(&adapter->hw, STATUS) &
1862                         IXGB_STATUS_TXOFF)) {
1863                         /* detected Tx unit hang */
1864                         DPRINTK(DRV, ERR, "Detected Tx Unit Hang\n"
1865                                         "  TDH                  <%x>\n"
1866                                         "  TDT                  <%x>\n"
1867                                         "  next_to_use          <%x>\n"
1868                                         "  next_to_clean        <%x>\n"
1869                                         "buffer_info[next_to_clean]\n"
1870                                         "  time_stamp           <%lx>\n"
1871                                         "  next_to_watch        <%x>\n"
1872                                         "  jiffies              <%lx>\n"
1873                                         "  next_to_watch.status <%x>\n",
1874                                 IXGB_READ_REG(&adapter->hw, TDH),
1875                                 IXGB_READ_REG(&adapter->hw, TDT),
1876                                 tx_ring->next_to_use,
1877                                 tx_ring->next_to_clean,
1878                                 tx_ring->buffer_info[eop].time_stamp,
1879                                 eop,
1880                                 jiffies,
1881                                 eop_desc->status);
1882                         netif_stop_queue(netdev);
1883                 }
1884         }
1885
1886         return cleaned;
1887 }
1888
1889 /**
1890  * ixgb_rx_checksum - Receive Checksum Offload for 82597.
1891  * @adapter: board private structure
1892  * @rx_desc: receive descriptor
1893  * @sk_buff: socket buffer with received data
1894  **/
1895
1896 static void
1897 ixgb_rx_checksum(struct ixgb_adapter *adapter,
1898                  struct ixgb_rx_desc *rx_desc,
1899                  struct sk_buff *skb)
1900 {
1901         /* Ignore Checksum bit is set OR
1902          * TCP Checksum has not been calculated
1903          */
1904         if((rx_desc->status & IXGB_RX_DESC_STATUS_IXSM) ||
1905            (!(rx_desc->status & IXGB_RX_DESC_STATUS_TCPCS))) {
1906                 skb->ip_summed = CHECKSUM_NONE;
1907                 return;
1908         }
1909
1910         /* At this point we know the hardware did the TCP checksum */
1911         /* now look at the TCP checksum error bit */
1912         if(rx_desc->errors & IXGB_RX_DESC_ERRORS_TCPE) {
1913                 /* let the stack verify checksum errors */
1914                 skb->ip_summed = CHECKSUM_NONE;
1915                 adapter->hw_csum_rx_error++;
1916         } else {
1917                 /* TCP checksum is good */
1918                 skb->ip_summed = CHECKSUM_UNNECESSARY;
1919                 adapter->hw_csum_rx_good++;
1920         }
1921 }
1922
1923 /**
1924  * ixgb_clean_rx_irq - Send received data up the network stack,
1925  * @adapter: board private structure
1926  **/
1927
1928 static boolean_t
1929 #ifdef CONFIG_IXGB_NAPI
1930 ixgb_clean_rx_irq(struct ixgb_adapter *adapter, int *work_done, int work_to_do)
1931 #else
1932 ixgb_clean_rx_irq(struct ixgb_adapter *adapter)
1933 #endif
1934 {
1935         struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
1936         struct net_device *netdev = adapter->netdev;
1937         struct pci_dev *pdev = adapter->pdev;
1938         struct ixgb_rx_desc *rx_desc, *next_rxd;
1939         struct ixgb_buffer *buffer_info, *next_buffer, *next2_buffer;
1940         uint32_t length;
1941         unsigned int i, j;
1942         boolean_t cleaned = FALSE;
1943
1944         i = rx_ring->next_to_clean;
1945         rx_desc = IXGB_RX_DESC(*rx_ring, i);
1946         buffer_info = &rx_ring->buffer_info[i];
1947
1948         while(rx_desc->status & IXGB_RX_DESC_STATUS_DD) {
1949                 struct sk_buff *skb, *next_skb;
1950                 u8 status;
1951
1952 #ifdef CONFIG_IXGB_NAPI
1953                 if(*work_done >= work_to_do)
1954                         break;
1955
1956                 (*work_done)++;
1957 #endif
1958                 status = rx_desc->status;
1959                 skb = buffer_info->skb;
1960                 buffer_info->skb = NULL;
1961
1962                 prefetch(skb->data);
1963
1964                 if(++i == rx_ring->count) i = 0;
1965                 next_rxd = IXGB_RX_DESC(*rx_ring, i);
1966                 prefetch(next_rxd);
1967
1968                 if((j = i + 1) == rx_ring->count) j = 0;
1969                 next2_buffer = &rx_ring->buffer_info[j];
1970                 prefetch(next2_buffer);
1971
1972                 next_buffer = &rx_ring->buffer_info[i];
1973                 next_skb = next_buffer->skb;
1974                 prefetch(next_skb);
1975
1976                 cleaned = TRUE;
1977
1978                 pci_unmap_single(pdev,
1979                                  buffer_info->dma,
1980                                  buffer_info->length,
1981                                  PCI_DMA_FROMDEVICE);
1982
1983                 length = le16_to_cpu(rx_desc->length);
1984
1985                 if(unlikely(!(status & IXGB_RX_DESC_STATUS_EOP))) {
1986
1987                         /* All receives must fit into a single buffer */
1988
1989                         IXGB_DBG("Receive packet consumed multiple buffers "
1990                                          "length<%x>\n", length);
1991
1992                         dev_kfree_skb_irq(skb);
1993                         goto rxdesc_done;
1994                 }
1995
1996                 if (unlikely(rx_desc->errors
1997                              & (IXGB_RX_DESC_ERRORS_CE | IXGB_RX_DESC_ERRORS_SE
1998                                 | IXGB_RX_DESC_ERRORS_P |
1999                                 IXGB_RX_DESC_ERRORS_RXE))) {
2000
2001                         dev_kfree_skb_irq(skb);
2002                         goto rxdesc_done;
2003                 }
2004
2005                 /* code added for copybreak, this should improve
2006                  * performance for small packets with large amounts
2007                  * of reassembly being done in the stack */
2008 #define IXGB_CB_LENGTH 256
2009                 if (length < IXGB_CB_LENGTH) {
2010                         struct sk_buff *new_skb =
2011                             netdev_alloc_skb(netdev, length + NET_IP_ALIGN);
2012                         if (new_skb) {
2013                                 skb_reserve(new_skb, NET_IP_ALIGN);
2014                                 skb_copy_to_linear_data_offset(new_skb,
2015                                                                -NET_IP_ALIGN,
2016                                                                (skb->data -
2017                                                                 NET_IP_ALIGN),
2018                                                                (length +
2019                                                                 NET_IP_ALIGN));
2020                                 /* save the skb in buffer_info as good */
2021                                 buffer_info->skb = skb;
2022                                 skb = new_skb;
2023                         }
2024                 }
2025                 /* end copybreak code */
2026
2027                 /* Good Receive */
2028                 skb_put(skb, length);
2029
2030                 /* Receive Checksum Offload */
2031                 ixgb_rx_checksum(adapter, rx_desc, skb);
2032
2033                 skb->protocol = eth_type_trans(skb, netdev);
2034 #ifdef CONFIG_IXGB_NAPI
2035                 if(adapter->vlgrp && (status & IXGB_RX_DESC_STATUS_VP)) {
2036                         vlan_hwaccel_receive_skb(skb, adapter->vlgrp,
2037                                 le16_to_cpu(rx_desc->special) &
2038                                         IXGB_RX_DESC_SPECIAL_VLAN_MASK);
2039                 } else {
2040                         netif_receive_skb(skb);
2041                 }
2042 #else /* CONFIG_IXGB_NAPI */
2043                 if(adapter->vlgrp && (status & IXGB_RX_DESC_STATUS_VP)) {
2044                         vlan_hwaccel_rx(skb, adapter->vlgrp,
2045                                 le16_to_cpu(rx_desc->special) &
2046                                         IXGB_RX_DESC_SPECIAL_VLAN_MASK);
2047                 } else {
2048                         netif_rx(skb);
2049                 }
2050 #endif /* CONFIG_IXGB_NAPI */
2051                 netdev->last_rx = jiffies;
2052
2053 rxdesc_done:
2054                 /* clean up descriptor, might be written over by hw */
2055                 rx_desc->status = 0;
2056
2057                 /* use prefetched values */
2058                 rx_desc = next_rxd;
2059                 buffer_info = next_buffer;
2060         }
2061
2062         rx_ring->next_to_clean = i;
2063
2064         ixgb_alloc_rx_buffers(adapter);
2065
2066         return cleaned;
2067 }
2068
2069 /**
2070  * ixgb_alloc_rx_buffers - Replace used receive buffers
2071  * @adapter: address of board private structure
2072  **/
2073
2074 static void
2075 ixgb_alloc_rx_buffers(struct ixgb_adapter *adapter)
2076 {
2077         struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
2078         struct net_device *netdev = adapter->netdev;
2079         struct pci_dev *pdev = adapter->pdev;
2080         struct ixgb_rx_desc *rx_desc;
2081         struct ixgb_buffer *buffer_info;
2082         struct sk_buff *skb;
2083         unsigned int i;
2084         int num_group_tail_writes;
2085         long cleancount;
2086
2087         i = rx_ring->next_to_use;
2088         buffer_info = &rx_ring->buffer_info[i];
2089         cleancount = IXGB_DESC_UNUSED(rx_ring);
2090
2091         num_group_tail_writes = IXGB_RX_BUFFER_WRITE;
2092
2093         /* leave three descriptors unused */
2094         while(--cleancount > 2) {
2095                 /* recycle! its good for you */
2096                 skb = buffer_info->skb;
2097                 if (skb) {
2098                         skb_trim(skb, 0);
2099                         goto map_skb;
2100                 }
2101
2102                 skb = netdev_alloc_skb(netdev, adapter->rx_buffer_len
2103                                        + NET_IP_ALIGN);
2104                 if (unlikely(!skb)) {
2105                         /* Better luck next round */
2106                         adapter->alloc_rx_buff_failed++;
2107                         break;
2108                 }
2109
2110                 /* Make buffer alignment 2 beyond a 16 byte boundary
2111                  * this will result in a 16 byte aligned IP header after
2112                  * the 14 byte MAC header is removed
2113                  */
2114                 skb_reserve(skb, NET_IP_ALIGN);
2115
2116                 buffer_info->skb = skb;
2117                 buffer_info->length = adapter->rx_buffer_len;
2118 map_skb:
2119                 buffer_info->dma = pci_map_single(pdev,
2120                                                   skb->data,
2121                                                   adapter->rx_buffer_len,
2122                                                   PCI_DMA_FROMDEVICE);
2123
2124                 rx_desc = IXGB_RX_DESC(*rx_ring, i);
2125                 rx_desc->buff_addr = cpu_to_le64(buffer_info->dma);
2126                 /* guarantee DD bit not set now before h/w gets descriptor
2127                  * this is the rest of the workaround for h/w double
2128                  * writeback. */
2129                 rx_desc->status = 0;
2130
2131
2132                 if(++i == rx_ring->count) i = 0;
2133                 buffer_info = &rx_ring->buffer_info[i];
2134         }
2135
2136         if (likely(rx_ring->next_to_use != i)) {
2137                 rx_ring->next_to_use = i;
2138                 if (unlikely(i-- == 0))
2139                         i = (rx_ring->count - 1);
2140
2141                 /* Force memory writes to complete before letting h/w
2142                  * know there are new descriptors to fetch.  (Only
2143                  * applicable for weak-ordered memory model archs, such
2144                  * as IA-64). */
2145                 wmb();
2146                 IXGB_WRITE_REG(&adapter->hw, RDT, i);
2147         }
2148 }
2149
2150 /**
2151  * ixgb_vlan_rx_register - enables or disables vlan tagging/stripping.
2152  *
2153  * @param netdev network interface device structure
2154  * @param grp indicates to enable or disable tagging/stripping
2155  **/
2156 static void
2157 ixgb_vlan_rx_register(struct net_device *netdev, struct vlan_group *grp)
2158 {
2159         struct ixgb_adapter *adapter = netdev_priv(netdev);
2160         uint32_t ctrl, rctl;
2161
2162         ixgb_irq_disable(adapter);
2163         adapter->vlgrp = grp;
2164
2165         if(grp) {
2166                 /* enable VLAN tag insert/strip */
2167                 ctrl = IXGB_READ_REG(&adapter->hw, CTRL0);
2168                 ctrl |= IXGB_CTRL0_VME;
2169                 IXGB_WRITE_REG(&adapter->hw, CTRL0, ctrl);
2170
2171                 /* enable VLAN receive filtering */
2172
2173                 rctl = IXGB_READ_REG(&adapter->hw, RCTL);
2174                 rctl |= IXGB_RCTL_VFE;
2175                 rctl &= ~IXGB_RCTL_CFIEN;
2176                 IXGB_WRITE_REG(&adapter->hw, RCTL, rctl);
2177         } else {
2178                 /* disable VLAN tag insert/strip */
2179
2180                 ctrl = IXGB_READ_REG(&adapter->hw, CTRL0);
2181                 ctrl &= ~IXGB_CTRL0_VME;
2182                 IXGB_WRITE_REG(&adapter->hw, CTRL0, ctrl);
2183
2184                 /* disable VLAN filtering */
2185
2186                 rctl = IXGB_READ_REG(&adapter->hw, RCTL);
2187                 rctl &= ~IXGB_RCTL_VFE;
2188                 IXGB_WRITE_REG(&adapter->hw, RCTL, rctl);
2189         }
2190
2191         ixgb_irq_enable(adapter);
2192 }
2193
2194 static void
2195 ixgb_vlan_rx_add_vid(struct net_device *netdev, uint16_t vid)
2196 {
2197         struct ixgb_adapter *adapter = netdev_priv(netdev);
2198         uint32_t vfta, index;
2199
2200         /* add VID to filter table */
2201
2202         index = (vid >> 5) & 0x7F;
2203         vfta = IXGB_READ_REG_ARRAY(&adapter->hw, VFTA, index);
2204         vfta |= (1 << (vid & 0x1F));
2205         ixgb_write_vfta(&adapter->hw, index, vfta);
2206 }
2207
2208 static void
2209 ixgb_vlan_rx_kill_vid(struct net_device *netdev, uint16_t vid)
2210 {
2211         struct ixgb_adapter *adapter = netdev_priv(netdev);
2212         uint32_t vfta, index;
2213
2214         ixgb_irq_disable(adapter);
2215
2216         vlan_group_set_device(adapter->vlgrp, vid, NULL);
2217
2218         ixgb_irq_enable(adapter);
2219
2220         /* remove VID from filter table*/
2221
2222         index = (vid >> 5) & 0x7F;
2223         vfta = IXGB_READ_REG_ARRAY(&adapter->hw, VFTA, index);
2224         vfta &= ~(1 << (vid & 0x1F));
2225         ixgb_write_vfta(&adapter->hw, index, vfta);
2226 }
2227
2228 static void
2229 ixgb_restore_vlan(struct ixgb_adapter *adapter)
2230 {
2231         ixgb_vlan_rx_register(adapter->netdev, adapter->vlgrp);
2232
2233         if(adapter->vlgrp) {
2234                 uint16_t vid;
2235                 for(vid = 0; vid < VLAN_GROUP_ARRAY_LEN; vid++) {
2236                         if(!vlan_group_get_device(adapter->vlgrp, vid))
2237                                 continue;
2238                         ixgb_vlan_rx_add_vid(adapter->netdev, vid);
2239                 }
2240         }
2241 }
2242
2243 #ifdef CONFIG_NET_POLL_CONTROLLER
2244 /*
2245  * Polling 'interrupt' - used by things like netconsole to send skbs
2246  * without having to re-enable interrupts. It's not called while
2247  * the interrupt routine is executing.
2248  */
2249
2250 static void ixgb_netpoll(struct net_device *dev)
2251 {
2252         struct ixgb_adapter *adapter = netdev_priv(dev);
2253
2254         disable_irq(adapter->pdev->irq);
2255         ixgb_intr(adapter->pdev->irq, dev);
2256         enable_irq(adapter->pdev->irq);
2257 }
2258 #endif
2259
2260 /**
2261  * ixgb_io_error_detected() - called when PCI error is detected
2262  * @pdev    pointer to pci device with error
2263  * @state   pci channel state after error
2264  *
2265  * This callback is called by the PCI subsystem whenever
2266  * a PCI bus error is detected.
2267  */
2268 static pci_ers_result_t ixgb_io_error_detected (struct pci_dev *pdev,
2269                                      enum pci_channel_state state)
2270 {
2271         struct net_device *netdev = pci_get_drvdata(pdev);
2272         struct ixgb_adapter *adapter = netdev_priv(netdev);
2273
2274         if(netif_running(netdev))
2275                 ixgb_down(adapter, TRUE);
2276
2277         pci_disable_device(pdev);
2278
2279         /* Request a slot reset. */
2280         return PCI_ERS_RESULT_NEED_RESET;
2281 }
2282
2283 /**
2284  * ixgb_io_slot_reset - called after the pci bus has been reset.
2285  * @pdev    pointer to pci device with error
2286  *
2287  * This callback is called after the PCI buss has been reset.
2288  * Basically, this tries to restart the card from scratch.
2289  * This is a shortened version of the device probe/discovery code,
2290  * it resembles the first-half of the ixgb_probe() routine.
2291  */
2292 static pci_ers_result_t ixgb_io_slot_reset (struct pci_dev *pdev)
2293 {
2294         struct net_device *netdev = pci_get_drvdata(pdev);
2295         struct ixgb_adapter *adapter = netdev_priv(netdev);
2296
2297         if(pci_enable_device(pdev)) {
2298                 DPRINTK(PROBE, ERR, "Cannot re-enable PCI device after reset.\n");
2299                 return PCI_ERS_RESULT_DISCONNECT;
2300         }
2301
2302         /* Perform card reset only on one instance of the card */
2303         if (0 != PCI_FUNC (pdev->devfn))
2304                 return PCI_ERS_RESULT_RECOVERED;
2305
2306         pci_set_master(pdev);
2307
2308         netif_carrier_off(netdev);
2309         netif_stop_queue(netdev);
2310         ixgb_reset(adapter);
2311
2312         /* Make sure the EEPROM is good */
2313         if(!ixgb_validate_eeprom_checksum(&adapter->hw)) {
2314                 DPRINTK(PROBE, ERR, "After reset, the EEPROM checksum is not valid.\n");
2315                 return PCI_ERS_RESULT_DISCONNECT;
2316         }
2317         ixgb_get_ee_mac_addr(&adapter->hw, netdev->dev_addr);
2318         memcpy(netdev->perm_addr, netdev->dev_addr, netdev->addr_len);
2319
2320         if(!is_valid_ether_addr(netdev->perm_addr)) {
2321                 DPRINTK(PROBE, ERR, "After reset, invalid MAC address.\n");
2322                 return PCI_ERS_RESULT_DISCONNECT;
2323         }
2324
2325         return PCI_ERS_RESULT_RECOVERED;
2326 }
2327
2328 /**
2329  * ixgb_io_resume - called when its OK to resume normal operations
2330  * @pdev    pointer to pci device with error
2331  *
2332  * The error recovery driver tells us that its OK to resume
2333  * normal operation. Implementation resembles the second-half
2334  * of the ixgb_probe() routine.
2335  */
2336 static void ixgb_io_resume (struct pci_dev *pdev)
2337 {
2338         struct net_device *netdev = pci_get_drvdata(pdev);
2339         struct ixgb_adapter *adapter = netdev_priv(netdev);
2340
2341         pci_set_master(pdev);
2342
2343         if(netif_running(netdev)) {
2344                 if(ixgb_up(adapter)) {
2345                         printk ("ixgb: can't bring device back up after reset\n");
2346                         return;
2347                 }
2348         }
2349
2350         netif_device_attach(netdev);
2351         mod_timer(&adapter->watchdog_timer, jiffies);
2352 }
2353
2354 /* ixgb_main.c */