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   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;
 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 #ifdef CONFIG_PCI_MSI
 250         {
 251         boolean_t pcix = (IXGB_READ_REG(&adapter->hw, STATUS) &
 252                                                   IXGB_STATUS_PCIX_MODE) ? TRUE : FALSE;
 253         adapter->have_msi = TRUE;
 254
 255         if (!pcix)
 256            adapter->have_msi = FALSE;
 257         else if((err = pci_enable_msi(adapter->pdev))) {
 258                 DPRINTK(PROBE, ERR,
 259                  "Unable to allocate MSI interrupt Error: %d\n", err);
 260                 adapter->have_msi = FALSE;
 261                 /* proceed to try to request regular interrupt */
 262         }
 263         }
 264
 265 #endif
 266         if((err = request_irq(adapter->pdev->irq, &ixgb_intr,
 267                                   IRQF_SHARED | IRQF_SAMPLE_RANDOM,
 268                                   netdev->name, netdev))) {
 269                 DPRINTK(PROBE, ERR,
 270                  "Unable to allocate interrupt Error: %d\n", err);
 271                 return err;
 272         }
 273
 274         if((hw->max_frame_size != max_frame) ||
 275                 (hw->max_frame_size !=
 276                 (IXGB_READ_REG(hw, MFS) >> IXGB_MFS_SHIFT))) {
 277
 278                 hw->max_frame_size = max_frame;
 279
 280                 IXGB_WRITE_REG(hw, MFS, hw->max_frame_size << IXGB_MFS_SHIFT);
 281
 282                 if(hw->max_frame_size >
 283                    IXGB_MAX_ENET_FRAME_SIZE_WITHOUT_FCS + ENET_FCS_LENGTH) {
 284                         uint32_t ctrl0 = IXGB_READ_REG(hw, CTRL0);
 285
 286                         if(!(ctrl0 & IXGB_CTRL0_JFE)) {
 287                                 ctrl0 |= IXGB_CTRL0_JFE;
 288                                 IXGB_WRITE_REG(hw, CTRL0, ctrl0);
 289                         }
 290                 }
 291         }
 292
 293         mod_timer(&adapter->watchdog_timer, jiffies);
 294
 295 #ifdef CONFIG_IXGB_NAPI
 296         netif_poll_enable(netdev);
 297 #endif
 298         ixgb_irq_enable(adapter);
 299
 300         return 0;
 301 }
 302
 303 void
 304 ixgb_down(struct ixgb_adapter *adapter, boolean_t kill_watchdog)
 305 {
 306         struct net_device *netdev = adapter->netdev;
 307
 308         ixgb_irq_disable(adapter);
 309         free_irq(adapter->pdev->irq, netdev);
 310 #ifdef CONFIG_PCI_MSI
 311         if(adapter->have_msi == TRUE)
 312                 pci_disable_msi(adapter->pdev);
 313
 314 #endif
 315         if(kill_watchdog)
 316                 del_timer_sync(&adapter->watchdog_timer);
 317 #ifdef CONFIG_IXGB_NAPI
 318         netif_poll_disable(netdev);
 319 #endif
 320         adapter->link_speed = 0;
 321         adapter->link_duplex = 0;
 322         netif_carrier_off(netdev);
 323         netif_stop_queue(netdev);
 324
 325         ixgb_reset(adapter);
 326         ixgb_clean_tx_ring(adapter);
 327         ixgb_clean_rx_ring(adapter);
 328 }
 329
 330 void
 331 ixgb_reset(struct ixgb_adapter *adapter)
 332 {
 333
 334         ixgb_adapter_stop(&adapter->hw);
 335         if(!ixgb_init_hw(&adapter->hw))
 336                 DPRINTK(PROBE, ERR, "ixgb_init_hw failed.\n");
 337 }
 338
 339 /**
 340  * ixgb_probe - Device Initialization Routine
 341  * @pdev: PCI device information struct
 342  * @ent: entry in ixgb_pci_tbl
 343  *
 344  * Returns 0 on success, negative on failure
 345  *
 346  * ixgb_probe initializes an adapter identified by a pci_dev structure.
 347  * The OS initialization, configuring of the adapter private structure,
 348  * and a hardware reset occur.
 349  **/
 350
 351 static int __devinit
 352 ixgb_probe(struct pci_dev *pdev,
 353                 const struct pci_device_id *ent)
 354 {
 355         struct net_device *netdev = NULL;
 356         struct ixgb_adapter *adapter;
 357         static int cards_found = 0;
 358         unsigned long mmio_start;
 359         int mmio_len;
 360         int pci_using_dac;
 361         int i;
 362         int err;
 363
 364         if((err = pci_enable_device(pdev)))
 365                 return err;
 366
 367         if(!(err = pci_set_dma_mask(pdev, DMA_64BIT_MASK)) &&
 368            !(err = pci_set_consistent_dma_mask(pdev, DMA_64BIT_MASK))) {
 369                 pci_using_dac = 1;
 370         } else {
 371                 if((err = pci_set_dma_mask(pdev, DMA_32BIT_MASK)) ||
 372                    (err = pci_set_consistent_dma_mask(pdev, DMA_32BIT_MASK))) {
 373                         printk(KERN_ERR
 374                          "ixgb: No usable DMA configuration, aborting\n");
 375                         goto err_dma_mask;
 376                 }
 377                 pci_using_dac = 0;
 378         }
 379
 380         if((err = pci_request_regions(pdev, ixgb_driver_name)))
 381                 goto err_request_regions;
 382
 383         pci_set_master(pdev);
 384
 385         netdev = alloc_etherdev(sizeof(struct ixgb_adapter));
 386         if(!netdev) {
 387                 err = -ENOMEM;
 388                 goto err_alloc_etherdev;
 389         }
 390
 391         SET_MODULE_OWNER(netdev);
 392         SET_NETDEV_DEV(netdev, &pdev->dev);
 393
 394         pci_set_drvdata(pdev, netdev);
 395         adapter = netdev_priv(netdev);
 396         adapter->netdev = netdev;
 397         adapter->pdev = pdev;
 398         adapter->hw.back = adapter;
 399         adapter->msg_enable = netif_msg_init(debug, DEFAULT_DEBUG_LEVEL_SHIFT);
 400
 401         mmio_start = pci_resource_start(pdev, BAR_0);
 402         mmio_len = pci_resource_len(pdev, BAR_0);
 403
 404         adapter->hw.hw_addr = ioremap(mmio_start, mmio_len);
 405         if(!adapter->hw.hw_addr) {
 406                 err = -EIO;
 407                 goto err_ioremap;
 408         }
 409
 410         for(i = BAR_1; i <= BAR_5; i++) {
 411                 if(pci_resource_len(pdev, i) == 0)
 412                         continue;
 413                 if(pci_resource_flags(pdev, i) & IORESOURCE_IO) {
 414                         adapter->hw.io_base = pci_resource_start(pdev, i);
 415                         break;
 416                 }
 417         }
 418
 419         netdev->open = &ixgb_open;
 420         netdev->stop = &ixgb_close;
 421         netdev->hard_start_xmit = &ixgb_xmit_frame;
 422         netdev->get_stats = &ixgb_get_stats;
 423         netdev->set_multicast_list = &ixgb_set_multi;
 424         netdev->set_mac_address = &ixgb_set_mac;
 425         netdev->change_mtu = &ixgb_change_mtu;
 426         ixgb_set_ethtool_ops(netdev);
 427         netdev->tx_timeout = &ixgb_tx_timeout;
 428         netdev->watchdog_timeo = 5 * HZ;
 429 #ifdef CONFIG_IXGB_NAPI
 430         netdev->poll = &ixgb_clean;
 431         netdev->weight = 64;
 432 #endif
 433         netdev->vlan_rx_register = ixgb_vlan_rx_register;
 434         netdev->vlan_rx_add_vid = ixgb_vlan_rx_add_vid;
 435         netdev->vlan_rx_kill_vid = ixgb_vlan_rx_kill_vid;
 436 #ifdef CONFIG_NET_POLL_CONTROLLER
 437         netdev->poll_controller = ixgb_netpoll;
 438 #endif
 439
 440         strncpy(netdev->name, pci_name(pdev), sizeof(netdev->name) - 1);
 441         netdev->mem_start = mmio_start;
 442         netdev->mem_end = mmio_start + mmio_len;
 443         netdev->base_addr = adapter->hw.io_base;
 444
 445         adapter->bd_number = cards_found;
 446         adapter->link_speed = 0;
 447         adapter->link_duplex = 0;
 448
 449         /* setup the private structure */
 450
 451         if((err = ixgb_sw_init(adapter)))
 452                 goto err_sw_init;
 453
 454         netdev->features = NETIF_F_SG |
 455                            NETIF_F_HW_CSUM |
 456                            NETIF_F_HW_VLAN_TX |
 457                            NETIF_F_HW_VLAN_RX |
 458                            NETIF_F_HW_VLAN_FILTER;
 459         netdev->features |= NETIF_F_TSO;
 460 #ifdef NETIF_F_LLTX
 461         netdev->features |= NETIF_F_LLTX;
 462 #endif
 463
 464         if(pci_using_dac)
 465                 netdev->features |= NETIF_F_HIGHDMA;
 466
 467         /* make sure the EEPROM is good */
 468
 469         if(!ixgb_validate_eeprom_checksum(&adapter->hw)) {
 470                 DPRINTK(PROBE, ERR, "The EEPROM Checksum Is Not Valid\n");
 471                 err = -EIO;
 472                 goto err_eeprom;
 473         }
 474
 475         ixgb_get_ee_mac_addr(&adapter->hw, netdev->dev_addr);
 476         memcpy(netdev->perm_addr, netdev->dev_addr, netdev->addr_len);
 477
 478         if(!is_valid_ether_addr(netdev->perm_addr)) {
 479                 DPRINTK(PROBE, ERR, "Invalid MAC Address\n");
 480                 err = -EIO;
 481                 goto err_eeprom;
 482         }
 483
 484         adapter->part_num = ixgb_get_ee_pba_number(&adapter->hw);
 485
 486         init_timer(&adapter->watchdog_timer);
 487         adapter->watchdog_timer.function = &ixgb_watchdog;
 488         adapter->watchdog_timer.data = (unsigned long)adapter;
 489
 490         INIT_WORK(&adapter->tx_timeout_task, ixgb_tx_timeout_task);
 491
 492         strcpy(netdev->name, "eth%d");
 493         if((err = register_netdev(netdev)))
 494                 goto err_register;
 495
 496         /* we're going to reset, so assume we have no link for now */
 497
 498         netif_carrier_off(netdev);
 499         netif_stop_queue(netdev);
 500
 501         DPRINTK(PROBE, INFO, "Intel(R) PRO/10GbE Network Connection\n");
 502         ixgb_check_options(adapter);
 503         /* reset the hardware with the new settings */
 504
 505         ixgb_reset(adapter);
 506
 507         cards_found++;
 508         return 0;
 509
 510 err_register:
 511 err_sw_init:
 512 err_eeprom:
 513         iounmap(adapter->hw.hw_addr);
 514 err_ioremap:
 515         free_netdev(netdev);
 516 err_alloc_etherdev:
 517         pci_release_regions(pdev);
 518 err_request_regions:
 519 err_dma_mask:
 520         pci_disable_device(pdev);
 521         return err;
 522 }
 523
 524 /**
 525  * ixgb_remove - Device Removal Routine
 526  * @pdev: PCI device information struct
 527  *
 528  * ixgb_remove is called by the PCI subsystem to alert the driver
 529  * that it should release a PCI device.  The could be caused by a
 530  * Hot-Plug event, or because the driver is going to be removed from
 531  * memory.
 532  **/
 533
 534 static void __devexit
 535 ixgb_remove(struct pci_dev *pdev)
 536 {
 537         struct net_device *netdev = pci_get_drvdata(pdev);
 538         struct ixgb_adapter *adapter = netdev_priv(netdev);
 539
 540         unregister_netdev(netdev);
 541
 542         iounmap(adapter->hw.hw_addr);
 543         pci_release_regions(pdev);
 544
 545         free_netdev(netdev);
 546 }
 547
 548 /**
 549  * ixgb_sw_init - Initialize general software structures (struct ixgb_adapter)
 550  * @adapter: board private structure to initialize
 551  *
 552  * ixgb_sw_init initializes the Adapter private data structure.
 553  * Fields are initialized based on PCI device information and
 554  * OS network device settings (MTU size).
 555  **/
 556
 557 static int __devinit
 558 ixgb_sw_init(struct ixgb_adapter *adapter)
 559 {
 560         struct ixgb_hw *hw = &adapter->hw;
 561         struct net_device *netdev = adapter->netdev;
 562         struct pci_dev *pdev = adapter->pdev;
 563
 564         /* PCI config space info */
 565
 566         hw->vendor_id = pdev->vendor;
 567         hw->device_id = pdev->device;
 568         hw->subsystem_vendor_id = pdev->subsystem_vendor;
 569         hw->subsystem_id = pdev->subsystem_device;
 570
 571         hw->max_frame_size = netdev->mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;
 572         adapter->rx_buffer_len = hw->max_frame_size;
 573
 574         if((hw->device_id == IXGB_DEVICE_ID_82597EX)
 575            || (hw->device_id == IXGB_DEVICE_ID_82597EX_CX4)
 576            || (hw->device_id == IXGB_DEVICE_ID_82597EX_LR)
 577            || (hw->device_id == IXGB_DEVICE_ID_82597EX_SR))
 578                         hw->mac_type = ixgb_82597;
 579         else {
 580                 /* should never have loaded on this device */
 581                 DPRINTK(PROBE, ERR, "unsupported device id\n");
 582         }
 583
 584         /* enable flow control to be programmed */
 585         hw->fc.send_xon = 1;
 586
 587         atomic_set(&adapter->irq_sem, 1);
 588         spin_lock_init(&adapter->tx_lock);
 589
 590         return 0;
 591 }
 592
 593 /**
 594  * ixgb_open - Called when a network interface is made active
 595  * @netdev: network interface device structure
 596  *
 597  * Returns 0 on success, negative value on failure
 598  *
 599  * The open entry point is called when a network interface is made
 600  * active by the system (IFF_UP).  At this point all resources needed
 601  * for transmit and receive operations are allocated, the interrupt
 602  * handler is registered with the OS, the watchdog timer is started,
 603  * and the stack is notified that the interface is ready.
 604  **/
 605
 606 static int
 607 ixgb_open(struct net_device *netdev)
 608 {
 609         struct ixgb_adapter *adapter = netdev_priv(netdev);
 610         int err;
 611
 612         /* allocate transmit descriptors */
 613
 614         if((err = ixgb_setup_tx_resources(adapter)))
 615                 goto err_setup_tx;
 616
 617         /* allocate receive descriptors */
 618
 619         if((err = ixgb_setup_rx_resources(adapter)))
 620                 goto err_setup_rx;
 621
 622         if((err = ixgb_up(adapter)))
 623                 goto err_up;
 624
 625         return 0;
 626
 627 err_up:
 628         ixgb_free_rx_resources(adapter);
 629 err_setup_rx:
 630         ixgb_free_tx_resources(adapter);
 631 err_setup_tx:
 632         ixgb_reset(adapter);
 633
 634         return err;
 635 }
 636
 637 /**
 638  * ixgb_close - Disables a network interface
 639  * @netdev: network interface device structure
 640  *
 641  * Returns 0, this is not allowed to fail
 642  *
 643  * The close entry point is called when an interface is de-activated
 644  * by the OS.  The hardware is still under the drivers control, but
 645  * needs to be disabled.  A global MAC reset is issued to stop the
 646  * hardware, and all transmit and receive resources are freed.
 647  **/
 648
 649 static int
 650 ixgb_close(struct net_device *netdev)
 651 {
 652         struct ixgb_adapter *adapter = netdev_priv(netdev);
 653
 654         ixgb_down(adapter, TRUE);
 655
 656         ixgb_free_tx_resources(adapter);
 657         ixgb_free_rx_resources(adapter);
 658
 659         return 0;
 660 }
 661
 662 /**
 663  * ixgb_setup_tx_resources - allocate Tx resources (Descriptors)
 664  * @adapter: board private structure
 665  *
 666  * Return 0 on success, negative on failure
 667  **/
 668
 669 int
 670 ixgb_setup_tx_resources(struct ixgb_adapter *adapter)
 671 {
 672         struct ixgb_desc_ring *txdr = &adapter->tx_ring;
 673         struct pci_dev *pdev = adapter->pdev;
 674         int size;
 675
 676         size = sizeof(struct ixgb_buffer) * txdr->count;
 677         txdr->buffer_info = vmalloc(size);
 678         if(!txdr->buffer_info) {
 679                 DPRINTK(PROBE, ERR,
 680                  "Unable to allocate transmit descriptor ring memory\n");
 681                 return -ENOMEM;
 682         }
 683         memset(txdr->buffer_info, 0, size);
 684
 685         /* round up to nearest 4K */
 686
 687         txdr->size = txdr->count * sizeof(struct ixgb_tx_desc);
 688         IXGB_ROUNDUP(txdr->size, 4096);
 689
 690         txdr->desc = pci_alloc_consistent(pdev, txdr->size, &txdr->dma);
 691         if(!txdr->desc) {
 692                 vfree(txdr->buffer_info);
 693                 DPRINTK(PROBE, ERR,
 694                  "Unable to allocate transmit descriptor memory\n");
 695                 return -ENOMEM;
 696         }
 697         memset(txdr->desc, 0, txdr->size);
 698
 699         txdr->next_to_use = 0;
 700         txdr->next_to_clean = 0;
 701
 702         return 0;
 703 }
 704
 705 /**
 706  * ixgb_configure_tx - Configure 82597 Transmit Unit after Reset.
 707  * @adapter: board private structure
 708  *
 709  * Configure the Tx unit of the MAC after a reset.
 710  **/
 711
 712 static void
 713 ixgb_configure_tx(struct ixgb_adapter *adapter)
 714 {
 715         uint64_t tdba = adapter->tx_ring.dma;
 716         uint32_t tdlen = adapter->tx_ring.count * sizeof(struct ixgb_tx_desc);
 717         uint32_t tctl;
 718         struct ixgb_hw *hw = &adapter->hw;
 719
 720         /* Setup the Base and Length of the Tx Descriptor Ring
 721          * tx_ring.dma can be either a 32 or 64 bit value
 722          */
 723
 724         IXGB_WRITE_REG(hw, TDBAL, (tdba & 0x00000000ffffffffULL));
 725         IXGB_WRITE_REG(hw, TDBAH, (tdba >> 32));
 726
 727         IXGB_WRITE_REG(hw, TDLEN, tdlen);
 728
 729         /* Setup the HW Tx Head and Tail descriptor pointers */
 730
 731         IXGB_WRITE_REG(hw, TDH, 0);
 732         IXGB_WRITE_REG(hw, TDT, 0);
 733
 734         /* don't set up txdctl, it induces performance problems if configured
 735          * incorrectly */
 736         /* Set the Tx Interrupt Delay register */
 737
 738         IXGB_WRITE_REG(hw, TIDV, adapter->tx_int_delay);
 739
 740         /* Program the Transmit Control Register */
 741
 742         tctl = IXGB_TCTL_TCE | IXGB_TCTL_TXEN | IXGB_TCTL_TPDE;
 743         IXGB_WRITE_REG(hw, TCTL, tctl);
 744
 745         /* Setup Transmit Descriptor Settings for this adapter */
 746         adapter->tx_cmd_type =
 747                 IXGB_TX_DESC_TYPE
 748                 | (adapter->tx_int_delay_enable ? IXGB_TX_DESC_CMD_IDE : 0);
 749 }
 750
 751 /**
 752  * ixgb_setup_rx_resources - allocate Rx resources (Descriptors)
 753  * @adapter: board private structure
 754  *
 755  * Returns 0 on success, negative on failure
 756  **/
 757
 758 int
 759 ixgb_setup_rx_resources(struct ixgb_adapter *adapter)
 760 {
 761         struct ixgb_desc_ring *rxdr = &adapter->rx_ring;
 762         struct pci_dev *pdev = adapter->pdev;
 763         int size;
 764
 765         size = sizeof(struct ixgb_buffer) * rxdr->count;
 766         rxdr->buffer_info = vmalloc(size);
 767         if(!rxdr->buffer_info) {
 768                 DPRINTK(PROBE, ERR,
 769                  "Unable to allocate receive descriptor ring\n");
 770                 return -ENOMEM;
 771         }
 772         memset(rxdr->buffer_info, 0, size);
 773
 774         /* Round up to nearest 4K */
 775
 776         rxdr->size = rxdr->count * sizeof(struct ixgb_rx_desc);
 777         IXGB_ROUNDUP(rxdr->size, 4096);
 778
 779         rxdr->desc = pci_alloc_consistent(pdev, rxdr->size, &rxdr->dma);
 780
 781         if(!rxdr->desc) {
 782                 vfree(rxdr->buffer_info);
 783                 DPRINTK(PROBE, ERR,
 784                  "Unable to allocate receive descriptors\n");
 785                 return -ENOMEM;
 786         }
 787         memset(rxdr->desc, 0, rxdr->size);
 788
 789         rxdr->next_to_clean = 0;
 790         rxdr->next_to_use = 0;
 791
 792         return 0;
 793 }
 794
 795 /**
 796  * ixgb_setup_rctl - configure the receive control register
 797  * @adapter: Board private structure
 798  **/
 799
 800 static void
 801 ixgb_setup_rctl(struct ixgb_adapter *adapter)
 802 {
 803         uint32_t rctl;
 804
 805         rctl = IXGB_READ_REG(&adapter->hw, RCTL);
 806
 807         rctl &= ~(3 << IXGB_RCTL_MO_SHIFT);
 808
 809         rctl |=
 810                 IXGB_RCTL_BAM | IXGB_RCTL_RDMTS_1_2 |
 811                 IXGB_RCTL_RXEN | IXGB_RCTL_CFF |
 812                 (adapter->hw.mc_filter_type << IXGB_RCTL_MO_SHIFT);
 813
 814         rctl |= IXGB_RCTL_SECRC;
 815
 816         if (adapter->rx_buffer_len <= IXGB_RXBUFFER_2048)
 817                 rctl |= IXGB_RCTL_BSIZE_2048;
 818         else if (adapter->rx_buffer_len <= IXGB_RXBUFFER_4096)
 819                 rctl |= IXGB_RCTL_BSIZE_4096;
 820         else if (adapter->rx_buffer_len <= IXGB_RXBUFFER_8192)
 821                 rctl |= IXGB_RCTL_BSIZE_8192;
 822         else if (adapter->rx_buffer_len <= IXGB_RXBUFFER_16384)
 823                 rctl |= IXGB_RCTL_BSIZE_16384;
 824
 825         IXGB_WRITE_REG(&adapter->hw, RCTL, rctl);
 826 }
 827
 828 /**
 829  * ixgb_configure_rx - Configure 82597 Receive Unit after Reset.
 830  * @adapter: board private structure
 831  *
 832  * Configure the Rx unit of the MAC after a reset.
 833  **/
 834
 835 static void
 836 ixgb_configure_rx(struct ixgb_adapter *adapter)
 837 {
 838         uint64_t rdba = adapter->rx_ring.dma;
 839         uint32_t rdlen = adapter->rx_ring.count * sizeof(struct ixgb_rx_desc);
 840         struct ixgb_hw *hw = &adapter->hw;
 841         uint32_t rctl;
 842         uint32_t rxcsum;
 843         uint32_t rxdctl;
 844
 845         /* make sure receives are disabled while setting up the descriptors */
 846
 847         rctl = IXGB_READ_REG(hw, RCTL);
 848         IXGB_WRITE_REG(hw, RCTL, rctl & ~IXGB_RCTL_RXEN);
 849
 850         /* set the Receive Delay Timer Register */
 851
 852         IXGB_WRITE_REG(hw, RDTR, adapter->rx_int_delay);
 853
 854         /* Setup the Base and Length of the Rx Descriptor Ring */
 855
 856         IXGB_WRITE_REG(hw, RDBAL, (rdba & 0x00000000ffffffffULL));
 857         IXGB_WRITE_REG(hw, RDBAH, (rdba >> 32));
 858
 859         IXGB_WRITE_REG(hw, RDLEN, rdlen);
 860
 861         /* Setup the HW Rx Head and Tail Descriptor Pointers */
 862         IXGB_WRITE_REG(hw, RDH, 0);
 863         IXGB_WRITE_REG(hw, RDT, 0);
 864
 865         /* set up pre-fetching of receive buffers so we get some before we
 866          * run out (default hardware behavior is to run out before fetching
 867          * more).  This sets up to fetch if HTHRESH rx descriptors are avail
 868          * and the descriptors in hw cache are below PTHRESH.  This avoids
 869          * the hardware behavior of fetching <=512 descriptors in a single
 870          * burst that pre-empts all other activity, usually causing fifo
 871          * overflows. */
 872         /* use WTHRESH to burst write 16 descriptors or burst when RXT0 */
 873         rxdctl = RXDCTL_WTHRESH_DEFAULT << IXGB_RXDCTL_WTHRESH_SHIFT |
 874                  RXDCTL_HTHRESH_DEFAULT << IXGB_RXDCTL_HTHRESH_SHIFT |
 875                  RXDCTL_PTHRESH_DEFAULT << IXGB_RXDCTL_PTHRESH_SHIFT;
 876         IXGB_WRITE_REG(hw, RXDCTL, rxdctl);
 877
 878         /* Enable Receive Checksum Offload for TCP and UDP */
 879         if(adapter->rx_csum == TRUE) {
 880                 rxcsum = IXGB_READ_REG(hw, RXCSUM);
 881                 rxcsum |= IXGB_RXCSUM_TUOFL;
 882                 IXGB_WRITE_REG(hw, RXCSUM, rxcsum);
 883         }
 884
 885         /* Enable Receives */
 886
 887         IXGB_WRITE_REG(hw, RCTL, rctl);
 888 }
 889
 890 /**
 891  * ixgb_free_tx_resources - Free Tx Resources
 892  * @adapter: board private structure
 893  *
 894  * Free all transmit software resources
 895  **/
 896
 897 void
 898 ixgb_free_tx_resources(struct ixgb_adapter *adapter)
 899 {
 900         struct pci_dev *pdev = adapter->pdev;
 901
 902         ixgb_clean_tx_ring(adapter);
 903
 904         vfree(adapter->tx_ring.buffer_info);
 905         adapter->tx_ring.buffer_info = NULL;
 906
 907         pci_free_consistent(pdev, adapter->tx_ring.size,
 908                             adapter->tx_ring.desc, adapter->tx_ring.dma);
 909
 910         adapter->tx_ring.desc = NULL;
 911 }
 912
 913 static void
 914 ixgb_unmap_and_free_tx_resource(struct ixgb_adapter *adapter,
 915                                         struct ixgb_buffer *buffer_info)
 916 {
 917         struct pci_dev *pdev = adapter->pdev;
 918
 919         if (buffer_info->dma)
 920                 pci_unmap_page(pdev, buffer_info->dma, buffer_info->length,
 921                                PCI_DMA_TODEVICE);
 922
 923         if (buffer_info->skb)
 924                 dev_kfree_skb_any(buffer_info->skb);
 925
 926         buffer_info->skb = NULL;
 927         buffer_info->dma = 0;
 928         buffer_info->time_stamp = 0;
 929         /* these fields must always be initialized in tx
 930          * buffer_info->length = 0;
 931          * buffer_info->next_to_watch = 0; */
 932 }
 933
 934 /**
 935  * ixgb_clean_tx_ring - Free Tx Buffers
 936  * @adapter: board private structure
 937  **/
 938
 939 static void
 940 ixgb_clean_tx_ring(struct ixgb_adapter *adapter)
 941 {
 942         struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
 943         struct ixgb_buffer *buffer_info;
 944         unsigned long size;
 945         unsigned int i;
 946
 947         /* Free all the Tx ring sk_buffs */
 948
 949         for(i = 0; i < tx_ring->count; i++) {
 950                 buffer_info = &tx_ring->buffer_info[i];
 951                 ixgb_unmap_and_free_tx_resource(adapter, buffer_info);
 952         }
 953
 954         size = sizeof(struct ixgb_buffer) * tx_ring->count;
 955         memset(tx_ring->buffer_info, 0, size);
 956
 957         /* Zero out the descriptor ring */
 958
 959         memset(tx_ring->desc, 0, tx_ring->size);
 960
 961         tx_ring->next_to_use = 0;
 962         tx_ring->next_to_clean = 0;
 963
 964         IXGB_WRITE_REG(&adapter->hw, TDH, 0);
 965         IXGB_WRITE_REG(&adapter->hw, TDT, 0);
 966 }
 967
 968 /**
 969  * ixgb_free_rx_resources - Free Rx Resources
 970  * @adapter: board private structure
 971  *
 972  * Free all receive software resources
 973  **/
 974
 975 void
 976 ixgb_free_rx_resources(struct ixgb_adapter *adapter)
 977 {
 978         struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
 979         struct pci_dev *pdev = adapter->pdev;
 980
 981         ixgb_clean_rx_ring(adapter);
 982
 983         vfree(rx_ring->buffer_info);
 984         rx_ring->buffer_info = NULL;
 985
 986         pci_free_consistent(pdev, rx_ring->size, rx_ring->desc, rx_ring->dma);
 987
 988         rx_ring->desc = NULL;
 989 }
 990
 991 /**
 992  * ixgb_clean_rx_ring - Free Rx Buffers
 993  * @adapter: board private structure
 994  **/
 995
 996 static void
 997 ixgb_clean_rx_ring(struct ixgb_adapter *adapter)
 998 {
 999         struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
1000         struct ixgb_buffer *buffer_info;
1001         struct pci_dev *pdev = adapter->pdev;
1002         unsigned long size;
1003         unsigned int i;
1004
1005         /* Free all the Rx ring sk_buffs */
1006
1007         for(i = 0; i < rx_ring->count; i++) {
1008                 buffer_info = &rx_ring->buffer_info[i];
1009                 if(buffer_info->skb) {
1010
1011                         pci_unmap_single(pdev,
1012                                          buffer_info->dma,
1013                                          buffer_info->length,
1014                                          PCI_DMA_FROMDEVICE);
1015
1016                         dev_kfree_skb(buffer_info->skb);
1017
1018                         buffer_info->skb = NULL;
1019                 }
1020         }
1021
1022         size = sizeof(struct ixgb_buffer) * rx_ring->count;
1023         memset(rx_ring->buffer_info, 0, size);
1024
1025         /* Zero out the descriptor ring */
1026
1027         memset(rx_ring->desc, 0, rx_ring->size);
1028
1029         rx_ring->next_to_clean = 0;
1030         rx_ring->next_to_use = 0;
1031
1032         IXGB_WRITE_REG(&adapter->hw, RDH, 0);
1033         IXGB_WRITE_REG(&adapter->hw, RDT, 0);
1034 }
1035
1036 /**
1037  * ixgb_set_mac - Change the Ethernet Address of the NIC
1038  * @netdev: network interface device structure
1039  * @p: pointer to an address structure
1040  *
1041  * Returns 0 on success, negative on failure
1042  **/
1043
1044 static int
1045 ixgb_set_mac(struct net_device *netdev, void *p)
1046 {
1047         struct ixgb_adapter *adapter = netdev_priv(netdev);
1048         struct sockaddr *addr = p;
1049
1050         if(!is_valid_ether_addr(addr->sa_data))
1051                 return -EADDRNOTAVAIL;
1052
1053         memcpy(netdev->dev_addr, addr->sa_data, netdev->addr_len);
1054
1055         ixgb_rar_set(&adapter->hw, addr->sa_data, 0);
1056
1057         return 0;
1058 }
1059
1060 /**
1061  * ixgb_set_multi - Multicast and Promiscuous mode set
1062  * @netdev: network interface device structure
1063  *
1064  * The set_multi entry point is called whenever the multicast address
1065  * list or the network interface flags are updated.  This routine is
1066  * responsible for configuring the hardware for proper multicast,
1067  * promiscuous mode, and all-multi behavior.
1068  **/
1069
1070 static void
1071 ixgb_set_multi(struct net_device *netdev)
1072 {
1073         struct ixgb_adapter *adapter = netdev_priv(netdev);
1074         struct ixgb_hw *hw = &adapter->hw;
1075         struct dev_mc_list *mc_ptr;
1076         uint32_t rctl;
1077         int i;
1078
1079         /* Check for Promiscuous and All Multicast modes */
1080
1081         rctl = IXGB_READ_REG(hw, RCTL);
1082
1083         if(netdev->flags & IFF_PROMISC) {
1084                 rctl |= (IXGB_RCTL_UPE | IXGB_RCTL_MPE);
1085         } else if(netdev->flags & IFF_ALLMULTI) {
1086                 rctl |= IXGB_RCTL_MPE;
1087                 rctl &= ~IXGB_RCTL_UPE;
1088         } else {
1089                 rctl &= ~(IXGB_RCTL_UPE | IXGB_RCTL_MPE);
1090         }
1091
1092         if(netdev->mc_count > IXGB_MAX_NUM_MULTICAST_ADDRESSES) {
1093                 rctl |= IXGB_RCTL_MPE;
1094                 IXGB_WRITE_REG(hw, RCTL, rctl);
1095         } else {
1096                 uint8_t mta[netdev->mc_count * IXGB_ETH_LENGTH_OF_ADDRESS];
1097
1098                 IXGB_WRITE_REG(hw, RCTL, rctl);
1099
1100                 for(i = 0, mc_ptr = netdev->mc_list; mc_ptr;
1101                         i++, mc_ptr = mc_ptr->next)
1102                         memcpy(&mta[i * IXGB_ETH_LENGTH_OF_ADDRESS],
1103                                    mc_ptr->dmi_addr, IXGB_ETH_LENGTH_OF_ADDRESS);
1104
1105                 ixgb_mc_addr_list_update(hw, mta, netdev->mc_count, 0);
1106         }
1107 }
1108
1109 /**
1110  * ixgb_watchdog - Timer Call-back
1111  * @data: pointer to netdev cast into an unsigned long
1112  **/
1113
1114 static void
1115 ixgb_watchdog(unsigned long data)
1116 {
1117         struct ixgb_adapter *adapter = (struct ixgb_adapter *)data;
1118         struct net_device *netdev = adapter->netdev;
1119         struct ixgb_desc_ring *txdr = &adapter->tx_ring;
1120
1121         ixgb_check_for_link(&adapter->hw);
1122
1123         if (ixgb_check_for_bad_link(&adapter->hw)) {
1124                 /* force the reset path */
1125                 netif_stop_queue(netdev);
1126         }
1127
1128         if(adapter->hw.link_up) {
1129                 if(!netif_carrier_ok(netdev)) {
1130                         DPRINTK(LINK, INFO,
1131                                 "NIC Link is Up 10000 Mbps Full Duplex\n");
1132                         adapter->link_speed = 10000;
1133                         adapter->link_duplex = FULL_DUPLEX;
1134                         netif_carrier_on(netdev);
1135                         netif_wake_queue(netdev);
1136                 }
1137         } else {
1138                 if(netif_carrier_ok(netdev)) {
1139                         adapter->link_speed = 0;
1140                         adapter->link_duplex = 0;
1141                         DPRINTK(LINK, INFO, "NIC Link is Down\n");
1142                         netif_carrier_off(netdev);
1143                         netif_stop_queue(netdev);
1144
1145                 }
1146         }
1147
1148         ixgb_update_stats(adapter);
1149
1150         if(!netif_carrier_ok(netdev)) {
1151                 if(IXGB_DESC_UNUSED(txdr) + 1 < txdr->count) {
1152                         /* We've lost link, so the controller stops DMA,
1153                          * but we've got queued Tx work that's never going
1154                          * to get done, so reset controller to flush Tx.
1155                          * (Do the reset outside of interrupt context). */
1156                         schedule_work(&adapter->tx_timeout_task);
1157                 }
1158         }
1159
1160         /* Force detection of hung controller every watchdog period */
1161         adapter->detect_tx_hung = TRUE;
1162
1163         /* generate an interrupt to force clean up of any stragglers */
1164         IXGB_WRITE_REG(&adapter->hw, ICS, IXGB_INT_TXDW);
1165
1166         /* Reset the timer */
1167         mod_timer(&adapter->watchdog_timer, jiffies + 2 * HZ);
1168 }
1169
1170 #define IXGB_TX_FLAGS_CSUM              0x00000001
1171 #define IXGB_TX_FLAGS_VLAN              0x00000002
1172 #define IXGB_TX_FLAGS_TSO               0x00000004
1173
1174 static int
1175 ixgb_tso(struct ixgb_adapter *adapter, struct sk_buff *skb)
1176 {
1177         struct ixgb_context_desc *context_desc;
1178         unsigned int i;
1179         uint8_t ipcss, ipcso, tucss, tucso, hdr_len;
1180         uint16_t ipcse, tucse, mss;
1181         int err;
1182
1183         if (likely(skb_is_gso(skb))) {
1184                 struct ixgb_buffer *buffer_info;
1185                 struct iphdr *iph;
1186
1187                 if (skb_header_cloned(skb)) {
1188                         err = pskb_expand_head(skb, 0, 0, GFP_ATOMIC);
1189                         if (err)
1190                                 return err;
1191                 }
1192
1193                 hdr_len = ((skb->h.raw - skb->data) + (skb->h.th->doff << 2));
1194                 mss = skb_shinfo(skb)->gso_size;
1195                 iph = ip_hdr(skb);
1196                 iph->tot_len = 0;
1197                 iph->check = 0;
1198                 skb->h.th->check = ~csum_tcpudp_magic(iph->saddr, iph->daddr,
1199                                                       0, IPPROTO_TCP, 0);
1200                 ipcss = skb_network_offset(skb);
1201                 ipcso = (void *)&(iph->check) - (void *)skb->data;
1202                 ipcse = skb->h.raw - skb->data - 1;
1203                 tucss = skb->h.raw - skb->data;
1204                 tucso = (void *)&(skb->h.th->check) - (void *)skb->data;
1205                 tucse = 0;
1206
1207                 i = adapter->tx_ring.next_to_use;
1208                 context_desc = IXGB_CONTEXT_DESC(adapter->tx_ring, i);
1209                 buffer_info = &adapter->tx_ring.buffer_info[i];
1210                 WARN_ON(buffer_info->dma != 0);
1211
1212                 context_desc->ipcss = ipcss;
1213                 context_desc->ipcso = ipcso;
1214                 context_desc->ipcse = cpu_to_le16(ipcse);
1215                 context_desc->tucss = tucss;
1216                 context_desc->tucso = tucso;
1217                 context_desc->tucse = cpu_to_le16(tucse);
1218                 context_desc->mss = cpu_to_le16(mss);
1219                 context_desc->hdr_len = hdr_len;
1220                 context_desc->status = 0;
1221                 context_desc->cmd_type_len = cpu_to_le32(
1222                                                   IXGB_CONTEXT_DESC_TYPE
1223                                                 | IXGB_CONTEXT_DESC_CMD_TSE
1224                                                 | IXGB_CONTEXT_DESC_CMD_IP
1225                                                 | IXGB_CONTEXT_DESC_CMD_TCP
1226                                                 | IXGB_CONTEXT_DESC_CMD_IDE
1227                                                 | (skb->len - (hdr_len)));
1228
1229
1230                 if(++i == adapter->tx_ring.count) i = 0;
1231                 adapter->tx_ring.next_to_use = i;
1232
1233                 return 1;
1234         }
1235
1236         return 0;
1237 }
1238
1239 static boolean_t
1240 ixgb_tx_csum(struct ixgb_adapter *adapter, struct sk_buff *skb)
1241 {
1242         struct ixgb_context_desc *context_desc;
1243         unsigned int i;
1244         uint8_t css, cso;
1245
1246         if(likely(skb->ip_summed == CHECKSUM_PARTIAL)) {
1247                 struct ixgb_buffer *buffer_info;
1248                 css = skb->h.raw - skb->data;
1249                 cso = css + skb->csum_offset;
1250
1251                 i = adapter->tx_ring.next_to_use;
1252                 context_desc = IXGB_CONTEXT_DESC(adapter->tx_ring, i);
1253                 buffer_info = &adapter->tx_ring.buffer_info[i];
1254                 WARN_ON(buffer_info->dma != 0);
1255
1256                 context_desc->tucss = css;
1257                 context_desc->tucso = cso;
1258                 context_desc->tucse = 0;
1259                 /* zero out any previously existing data in one instruction */
1260                 *(uint32_t *)&(context_desc->ipcss) = 0;
1261                 context_desc->status = 0;
1262                 context_desc->hdr_len = 0;
1263                 context_desc->mss = 0;
1264                 context_desc->cmd_type_len =
1265                         cpu_to_le32(IXGB_CONTEXT_DESC_TYPE
1266                                     | IXGB_TX_DESC_CMD_IDE);
1267
1268                 if(++i == adapter->tx_ring.count) i = 0;
1269                 adapter->tx_ring.next_to_use = i;
1270
1271                 return TRUE;
1272         }
1273
1274         return FALSE;
1275 }
1276
1277 #define IXGB_MAX_TXD_PWR        14
1278 #define IXGB_MAX_DATA_PER_TXD   (1<<IXGB_MAX_TXD_PWR)
1279
1280 static int
1281 ixgb_tx_map(struct ixgb_adapter *adapter, struct sk_buff *skb,
1282             unsigned int first)
1283 {
1284         struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
1285         struct ixgb_buffer *buffer_info;
1286         int len = skb->len;
1287         unsigned int offset = 0, size, count = 0, i;
1288         unsigned int mss = skb_shinfo(skb)->gso_size;
1289
1290         unsigned int nr_frags = skb_shinfo(skb)->nr_frags;
1291         unsigned int f;
1292
1293         len -= skb->data_len;
1294
1295         i = tx_ring->next_to_use;
1296
1297         while(len) {
1298                 buffer_info = &tx_ring->buffer_info[i];
1299                 size = min(len, IXGB_MAX_DATA_PER_TXD);
1300                 /* Workaround for premature desc write-backs
1301                  * in TSO mode.  Append 4-byte sentinel desc */
1302                 if (unlikely(mss && !nr_frags && size == len && size > 8))
1303                         size -= 4;
1304
1305                 buffer_info->length = size;
1306                 WARN_ON(buffer_info->dma != 0);
1307                 buffer_info->dma =
1308                         pci_map_single(adapter->pdev,
1309                                 skb->data + offset,
1310                                 size,
1311                                 PCI_DMA_TODEVICE);
1312                 buffer_info->time_stamp = jiffies;
1313                 buffer_info->next_to_watch = 0;
1314
1315                 len -= size;
1316                 offset += size;
1317                 count++;
1318                 if(++i == tx_ring->count) i = 0;
1319         }
1320
1321         for(f = 0; f < nr_frags; f++) {
1322                 struct skb_frag_struct *frag;
1323
1324                 frag = &skb_shinfo(skb)->frags[f];
1325                 len = frag->size;
1326                 offset = 0;
1327
1328                 while(len) {
1329                         buffer_info = &tx_ring->buffer_info[i];
1330                         size = min(len, IXGB_MAX_DATA_PER_TXD);
1331
1332                         /* Workaround for premature desc write-backs
1333                          * in TSO mode.  Append 4-byte sentinel desc */
1334                         if (unlikely(mss && !nr_frags && size == len
1335                                      && size > 8))
1336                                 size -= 4;
1337
1338                         buffer_info->length = size;
1339                         buffer_info->dma =
1340                                 pci_map_page(adapter->pdev,
1341                                         frag->page,
1342                                         frag->page_offset + offset,
1343                                         size,
1344                                         PCI_DMA_TODEVICE);
1345                         buffer_info->time_stamp = jiffies;
1346                         buffer_info->next_to_watch = 0;
1347
1348                         len -= size;
1349                         offset += size;
1350                         count++;
1351                         if(++i == tx_ring->count) i = 0;
1352                 }
1353         }
1354         i = (i == 0) ? tx_ring->count - 1 : i - 1;
1355         tx_ring->buffer_info[i].skb = skb;
1356         tx_ring->buffer_info[first].next_to_watch = i;
1357
1358         return count;
1359 }
1360
1361 static void
1362 ixgb_tx_queue(struct ixgb_adapter *adapter, int count, int vlan_id,int tx_flags)
1363 {
1364         struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
1365         struct ixgb_tx_desc *tx_desc = NULL;
1366         struct ixgb_buffer *buffer_info;
1367         uint32_t cmd_type_len = adapter->tx_cmd_type;
1368         uint8_t status = 0;
1369         uint8_t popts = 0;
1370         unsigned int i;
1371
1372         if(tx_flags & IXGB_TX_FLAGS_TSO) {
1373                 cmd_type_len |= IXGB_TX_DESC_CMD_TSE;
1374                 popts |= (IXGB_TX_DESC_POPTS_IXSM | IXGB_TX_DESC_POPTS_TXSM);
1375         }
1376
1377         if(tx_flags & IXGB_TX_FLAGS_CSUM)
1378                 popts |= IXGB_TX_DESC_POPTS_TXSM;
1379
1380         if(tx_flags & IXGB_TX_FLAGS_VLAN) {
1381                 cmd_type_len |= IXGB_TX_DESC_CMD_VLE;
1382         }
1383
1384         i = tx_ring->next_to_use;
1385
1386         while(count--) {
1387                 buffer_info = &tx_ring->buffer_info[i];
1388                 tx_desc = IXGB_TX_DESC(*tx_ring, i);
1389                 tx_desc->buff_addr = cpu_to_le64(buffer_info->dma);
1390                 tx_desc->cmd_type_len =
1391                         cpu_to_le32(cmd_type_len | buffer_info->length);
1392                 tx_desc->status = status;
1393                 tx_desc->popts = popts;
1394                 tx_desc->vlan = cpu_to_le16(vlan_id);
1395
1396                 if(++i == tx_ring->count) i = 0;
1397         }
1398
1399         tx_desc->cmd_type_len |= cpu_to_le32(IXGB_TX_DESC_CMD_EOP
1400                                 | IXGB_TX_DESC_CMD_RS );
1401
1402         /* Force memory writes to complete before letting h/w
1403          * know there are new descriptors to fetch.  (Only
1404          * applicable for weak-ordered memory model archs,
1405          * such as IA-64). */
1406         wmb();
1407
1408         tx_ring->next_to_use = i;
1409         IXGB_WRITE_REG(&adapter->hw, TDT, i);
1410 }
1411
1412 static int __ixgb_maybe_stop_tx(struct net_device *netdev, int size)
1413 {
1414         struct ixgb_adapter *adapter = netdev_priv(netdev);
1415         struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
1416
1417         netif_stop_queue(netdev);
1418         /* Herbert's original patch had:
1419          *  smp_mb__after_netif_stop_queue();
1420          * but since that doesn't exist yet, just open code it. */
1421         smp_mb();
1422
1423         /* We need to check again in a case another CPU has just
1424          * made room available. */
1425         if (likely(IXGB_DESC_UNUSED(tx_ring) < size))
1426                 return -EBUSY;
1427
1428         /* A reprieve! */
1429         netif_start_queue(netdev);
1430         ++adapter->restart_queue;
1431         return 0;
1432 }
1433
1434 static int ixgb_maybe_stop_tx(struct net_device *netdev,
1435                               struct ixgb_desc_ring *tx_ring, int size)
1436 {
1437         if (likely(IXGB_DESC_UNUSED(tx_ring) >= size))
1438                 return 0;
1439         return __ixgb_maybe_stop_tx(netdev, size);
1440 }
1441
1442
1443 /* Tx Descriptors needed, worst case */
1444 #define TXD_USE_COUNT(S) (((S) >> IXGB_MAX_TXD_PWR) + \
1445                          (((S) & (IXGB_MAX_DATA_PER_TXD - 1)) ? 1 : 0))
1446 #define DESC_NEEDED TXD_USE_COUNT(IXGB_MAX_DATA_PER_TXD) /* skb->date */ + \
1447         MAX_SKB_FRAGS * TXD_USE_COUNT(PAGE_SIZE) + 1 /* for context */ \
1448         + 1 /* one more needed for sentinel TSO workaround */
1449
1450 static int
1451 ixgb_xmit_frame(struct sk_buff *skb, struct net_device *netdev)
1452 {
1453         struct ixgb_adapter *adapter = netdev_priv(netdev);
1454         unsigned int first;
1455         unsigned int tx_flags = 0;
1456         unsigned long flags;
1457         int vlan_id = 0;
1458         int tso;
1459
1460         if(skb->len <= 0) {
1461                 dev_kfree_skb_any(skb);
1462                 return 0;
1463         }
1464
1465 #ifdef NETIF_F_LLTX
1466         local_irq_save(flags);
1467         if (!spin_trylock(&adapter->tx_lock)) {
1468                 /* Collision - tell upper layer to requeue */
1469                 local_irq_restore(flags);
1470                 return NETDEV_TX_LOCKED;
1471         }
1472 #else
1473         spin_lock_irqsave(&adapter->tx_lock, flags);
1474 #endif
1475
1476         if (unlikely(ixgb_maybe_stop_tx(netdev, &adapter->tx_ring,
1477                      DESC_NEEDED))) {
1478                 netif_stop_queue(netdev);
1479                 spin_unlock_irqrestore(&adapter->tx_lock, flags);
1480                 return NETDEV_TX_BUSY;
1481         }
1482
1483 #ifndef NETIF_F_LLTX
1484         spin_unlock_irqrestore(&adapter->tx_lock, flags);
1485 #endif
1486
1487         if(adapter->vlgrp && vlan_tx_tag_present(skb)) {
1488                 tx_flags |= IXGB_TX_FLAGS_VLAN;
1489                 vlan_id = vlan_tx_tag_get(skb);
1490         }
1491
1492         first = adapter->tx_ring.next_to_use;
1493
1494         tso = ixgb_tso(adapter, skb);
1495         if (tso < 0) {
1496                 dev_kfree_skb_any(skb);
1497 #ifdef NETIF_F_LLTX
1498                 spin_unlock_irqrestore(&adapter->tx_lock, flags);
1499 #endif
1500                 return NETDEV_TX_OK;
1501         }
1502
1503         if (likely(tso))
1504                 tx_flags |= IXGB_TX_FLAGS_TSO;
1505         else if(ixgb_tx_csum(adapter, skb))
1506                 tx_flags |= IXGB_TX_FLAGS_CSUM;
1507
1508         ixgb_tx_queue(adapter, ixgb_tx_map(adapter, skb, first), vlan_id,
1509                         tx_flags);
1510
1511         netdev->trans_start = jiffies;
1512
1513 #ifdef NETIF_F_LLTX
1514         /* Make sure there is space in the ring for the next send. */
1515         ixgb_maybe_stop_tx(netdev, &adapter->tx_ring, DESC_NEEDED);
1516
1517         spin_unlock_irqrestore(&adapter->tx_lock, flags);
1518
1519 #endif
1520         return NETDEV_TX_OK;
1521 }
1522
1523 /**
1524  * ixgb_tx_timeout - Respond to a Tx Hang
1525  * @netdev: network interface device structure
1526  **/
1527
1528 static void
1529 ixgb_tx_timeout(struct net_device *netdev)
1530 {
1531         struct ixgb_adapter *adapter = netdev_priv(netdev);
1532
1533         /* Do the reset outside of interrupt context */
1534         schedule_work(&adapter->tx_timeout_task);
1535 }
1536
1537 static void
1538 ixgb_tx_timeout_task(struct work_struct *work)
1539 {
1540         struct ixgb_adapter *adapter =
1541                 container_of(work, struct ixgb_adapter, tx_timeout_task);
1542
1543         adapter->tx_timeout_count++;
1544         ixgb_down(adapter, TRUE);
1545         ixgb_up(adapter);
1546 }
1547
1548 /**
1549  * ixgb_get_stats - Get System Network Statistics
1550  * @netdev: network interface device structure
1551  *
1552  * Returns the address of the device statistics structure.
1553  * The statistics are actually updated from the timer callback.
1554  **/
1555
1556 static struct net_device_stats *
1557 ixgb_get_stats(struct net_device *netdev)
1558 {
1559         struct ixgb_adapter *adapter = netdev_priv(netdev);
1560
1561         return &adapter->net_stats;
1562 }
1563
1564 /**
1565  * ixgb_change_mtu - Change the Maximum Transfer Unit
1566  * @netdev: network interface device structure
1567  * @new_mtu: new value for maximum frame size
1568  *
1569  * Returns 0 on success, negative on failure
1570  **/
1571
1572 static int
1573 ixgb_change_mtu(struct net_device *netdev, int new_mtu)
1574 {
1575         struct ixgb_adapter *adapter = netdev_priv(netdev);
1576         int max_frame = new_mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;
1577         int old_max_frame = netdev->mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;
1578
1579
1580         if((max_frame < IXGB_MIN_ENET_FRAME_SIZE_WITHOUT_FCS + ENET_FCS_LENGTH)
1581            || (max_frame > IXGB_MAX_JUMBO_FRAME_SIZE + ENET_FCS_LENGTH)) {
1582                 DPRINTK(PROBE, ERR, "Invalid MTU setting %d\n", new_mtu);
1583                 return -EINVAL;
1584         }
1585
1586         adapter->rx_buffer_len = max_frame;
1587
1588         netdev->mtu = new_mtu;
1589
1590         if ((old_max_frame != max_frame) && netif_running(netdev)) {
1591                 ixgb_down(adapter, TRUE);
1592                 ixgb_up(adapter);
1593         }
1594
1595         return 0;
1596 }
1597
1598 /**
1599  * ixgb_update_stats - Update the board statistics counters.
1600  * @adapter: board private structure
1601  **/
1602
1603 void
1604 ixgb_update_stats(struct ixgb_adapter *adapter)
1605 {
1606         struct net_device *netdev = adapter->netdev;
1607         struct pci_dev *pdev = adapter->pdev;
1608
1609         /* Prevent stats update while adapter is being reset */
1610         if (pci_channel_offline(pdev))
1611                 return;
1612
1613         if((netdev->flags & IFF_PROMISC) || (netdev->flags & IFF_ALLMULTI) ||
1614            (netdev->mc_count > IXGB_MAX_NUM_MULTICAST_ADDRESSES)) {
1615                 u64 multi = IXGB_READ_REG(&adapter->hw, MPRCL);
1616                 u32 bcast_l = IXGB_READ_REG(&adapter->hw, BPRCL);
1617                 u32 bcast_h = IXGB_READ_REG(&adapter->hw, BPRCH);
1618                 u64 bcast = ((u64)bcast_h << 32) | bcast_l;
1619
1620                 multi |= ((u64)IXGB_READ_REG(&adapter->hw, MPRCH) << 32);
1621                 /* fix up multicast stats by removing broadcasts */
1622                 if(multi >= bcast)
1623                         multi -= bcast;
1624
1625                 adapter->stats.mprcl += (multi & 0xFFFFFFFF);
1626                 adapter->stats.mprch += (multi >> 32);
1627                 adapter->stats.bprcl += bcast_l;
1628                 adapter->stats.bprch += bcast_h;
1629         } else {
1630                 adapter->stats.mprcl += IXGB_READ_REG(&adapter->hw, MPRCL);
1631                 adapter->stats.mprch += IXGB_READ_REG(&adapter->hw, MPRCH);
1632                 adapter->stats.bprcl += IXGB_READ_REG(&adapter->hw, BPRCL);
1633                 adapter->stats.bprch += IXGB_READ_REG(&adapter->hw, BPRCH);
1634         }
1635         adapter->stats.tprl += IXGB_READ_REG(&adapter->hw, TPRL);
1636         adapter->stats.tprh += IXGB_READ_REG(&adapter->hw, TPRH);
1637         adapter->stats.gprcl += IXGB_READ_REG(&adapter->hw, GPRCL);
1638         adapter->stats.gprch += IXGB_READ_REG(&adapter->hw, GPRCH);
1639         adapter->stats.uprcl += IXGB_READ_REG(&adapter->hw, UPRCL);
1640         adapter->stats.uprch += IXGB_READ_REG(&adapter->hw, UPRCH);
1641         adapter->stats.vprcl += IXGB_READ_REG(&adapter->hw, VPRCL);
1642         adapter->stats.vprch += IXGB_READ_REG(&adapter->hw, VPRCH);
1643         adapter->stats.jprcl += IXGB_READ_REG(&adapter->hw, JPRCL);
1644         adapter->stats.jprch += IXGB_READ_REG(&adapter->hw, JPRCH);
1645         adapter->stats.gorcl += IXGB_READ_REG(&adapter->hw, GORCL);
1646         adapter->stats.gorch += IXGB_READ_REG(&adapter->hw, GORCH);
1647         adapter->stats.torl += IXGB_READ_REG(&adapter->hw, TORL);
1648         adapter->stats.torh += IXGB_READ_REG(&adapter->hw, TORH);
1649         adapter->stats.rnbc += IXGB_READ_REG(&adapter->hw, RNBC);
1650         adapter->stats.ruc += IXGB_READ_REG(&adapter->hw, RUC);
1651         adapter->stats.roc += IXGB_READ_REG(&adapter->hw, ROC);
1652         adapter->stats.rlec += IXGB_READ_REG(&adapter->hw, RLEC);
1653         adapter->stats.crcerrs += IXGB_READ_REG(&adapter->hw, CRCERRS);
1654         adapter->stats.icbc += IXGB_READ_REG(&adapter->hw, ICBC);
1655         adapter->stats.ecbc += IXGB_READ_REG(&adapter->hw, ECBC);
1656         adapter->stats.mpc += IXGB_READ_REG(&adapter->hw, MPC);
1657         adapter->stats.tptl += IXGB_READ_REG(&adapter->hw, TPTL);
1658         adapter->stats.tpth += IXGB_READ_REG(&adapter->hw, TPTH);
1659         adapter->stats.gptcl += IXGB_READ_REG(&adapter->hw, GPTCL);
1660         adapter->stats.gptch += IXGB_READ_REG(&adapter->hw, GPTCH);
1661         adapter->stats.bptcl += IXGB_READ_REG(&adapter->hw, BPTCL);
1662         adapter->stats.bptch += IXGB_READ_REG(&adapter->hw, BPTCH);
1663         adapter->stats.mptcl += IXGB_READ_REG(&adapter->hw, MPTCL);
1664         adapter->stats.mptch += IXGB_READ_REG(&adapter->hw, MPTCH);
1665         adapter->stats.uptcl += IXGB_READ_REG(&adapter->hw, UPTCL);
1666         adapter->stats.uptch += IXGB_READ_REG(&adapter->hw, UPTCH);
1667         adapter->stats.vptcl += IXGB_READ_REG(&adapter->hw, VPTCL);
1668         adapter->stats.vptch += IXGB_READ_REG(&adapter->hw, VPTCH);
1669         adapter->stats.jptcl += IXGB_READ_REG(&adapter->hw, JPTCL);
1670         adapter->stats.jptch += IXGB_READ_REG(&adapter->hw, JPTCH);
1671         adapter->stats.gotcl += IXGB_READ_REG(&adapter->hw, GOTCL);
1672         adapter->stats.gotch += IXGB_READ_REG(&adapter->hw, GOTCH);
1673         adapter->stats.totl += IXGB_READ_REG(&adapter->hw, TOTL);
1674         adapter->stats.toth += IXGB_READ_REG(&adapter->hw, TOTH);
1675         adapter->stats.dc += IXGB_READ_REG(&adapter->hw, DC);
1676         adapter->stats.plt64c += IXGB_READ_REG(&adapter->hw, PLT64C);
1677         adapter->stats.tsctc += IXGB_READ_REG(&adapter->hw, TSCTC);
1678         adapter->stats.tsctfc += IXGB_READ_REG(&adapter->hw, TSCTFC);
1679         adapter->stats.ibic += IXGB_READ_REG(&adapter->hw, IBIC);
1680         adapter->stats.rfc += IXGB_READ_REG(&adapter->hw, RFC);
1681         adapter->stats.lfc += IXGB_READ_REG(&adapter->hw, LFC);
1682         adapter->stats.pfrc += IXGB_READ_REG(&adapter->hw, PFRC);
1683         adapter->stats.pftc += IXGB_READ_REG(&adapter->hw, PFTC);
1684         adapter->stats.mcfrc += IXGB_READ_REG(&adapter->hw, MCFRC);
1685         adapter->stats.mcftc += IXGB_READ_REG(&adapter->hw, MCFTC);
1686         adapter->stats.xonrxc += IXGB_READ_REG(&adapter->hw, XONRXC);
1687         adapter->stats.xontxc += IXGB_READ_REG(&adapter->hw, XONTXC);
1688         adapter->stats.xoffrxc += IXGB_READ_REG(&adapter->hw, XOFFRXC);
1689         adapter->stats.xofftxc += IXGB_READ_REG(&adapter->hw, XOFFTXC);
1690         adapter->stats.rjc += IXGB_READ_REG(&adapter->hw, RJC);
1691
1692         /* Fill out the OS statistics structure */
1693
1694         adapter->net_stats.rx_packets = adapter->stats.gprcl;
1695         adapter->net_stats.tx_packets = adapter->stats.gptcl;
1696         adapter->net_stats.rx_bytes = adapter->stats.gorcl;
1697         adapter->net_stats.tx_bytes = adapter->stats.gotcl;
1698         adapter->net_stats.multicast = adapter->stats.mprcl;
1699         adapter->net_stats.collisions = 0;
1700
1701         /* ignore RLEC as it reports errors for padded (<64bytes) frames
1702          * with a length in the type/len field */
1703         adapter->net_stats.rx_errors =
1704             /* adapter->stats.rnbc + */ adapter->stats.crcerrs +
1705             adapter->stats.ruc +
1706             adapter->stats.roc /*+ adapter->stats.rlec */  +
1707             adapter->stats.icbc +
1708             adapter->stats.ecbc + adapter->stats.mpc;
1709
1710         /* see above
1711          * adapter->net_stats.rx_length_errors = adapter->stats.rlec;
1712          */
1713
1714         adapter->net_stats.rx_crc_errors = adapter->stats.crcerrs;
1715         adapter->net_stats.rx_fifo_errors = adapter->stats.mpc;
1716         adapter->net_stats.rx_missed_errors = adapter->stats.mpc;
1717         adapter->net_stats.rx_over_errors = adapter->stats.mpc;
1718
1719         adapter->net_stats.tx_errors = 0;
1720         adapter->net_stats.rx_frame_errors = 0;
1721         adapter->net_stats.tx_aborted_errors = 0;
1722         adapter->net_stats.tx_carrier_errors = 0;
1723         adapter->net_stats.tx_fifo_errors = 0;
1724         adapter->net_stats.tx_heartbeat_errors = 0;
1725         adapter->net_stats.tx_window_errors = 0;
1726 }
1727
1728 #define IXGB_MAX_INTR 10
1729 /**
1730  * ixgb_intr - Interrupt Handler
1731  * @irq: interrupt number
1732  * @data: pointer to a network interface device structure
1733  **/
1734
1735 static irqreturn_t
1736 ixgb_intr(int irq, void *data)
1737 {
1738         struct net_device *netdev = data;
1739         struct ixgb_adapter *adapter = netdev_priv(netdev);
1740         struct ixgb_hw *hw = &adapter->hw;
1741         uint32_t icr = IXGB_READ_REG(hw, ICR);
1742 #ifndef CONFIG_IXGB_NAPI
1743         unsigned int i;
1744 #endif
1745
1746         if(unlikely(!icr))
1747                 return IRQ_NONE;  /* Not our interrupt */
1748
1749         if(unlikely(icr & (IXGB_INT_RXSEQ | IXGB_INT_LSC))) {
1750                 mod_timer(&adapter->watchdog_timer, jiffies);
1751         }
1752
1753 #ifdef CONFIG_IXGB_NAPI
1754         if(netif_rx_schedule_prep(netdev)) {
1755
1756                 /* Disable interrupts and register for poll. The flush
1757                   of the posted write is intentionally left out.
1758                 */
1759
1760                 atomic_inc(&adapter->irq_sem);
1761                 IXGB_WRITE_REG(&adapter->hw, IMC, ~0);
1762                 __netif_rx_schedule(netdev);
1763         }
1764 #else
1765         /* yes, that is actually a & and it is meant to make sure that
1766          * every pass through this for loop checks both receive and
1767          * transmit queues for completed descriptors, intended to
1768          * avoid starvation issues and assist tx/rx fairness. */
1769         for(i = 0; i < IXGB_MAX_INTR; i++)
1770                 if(!ixgb_clean_rx_irq(adapter) &
1771                    !ixgb_clean_tx_irq(adapter))
1772                         break;
1773 #endif
1774         return IRQ_HANDLED;
1775 }
1776
1777 #ifdef CONFIG_IXGB_NAPI
1778 /**
1779  * ixgb_clean - NAPI Rx polling callback
1780  * @adapter: board private structure
1781  **/
1782
1783 static int
1784 ixgb_clean(struct net_device *netdev, int *budget)
1785 {
1786         struct ixgb_adapter *adapter = netdev_priv(netdev);
1787         int work_to_do = min(*budget, netdev->quota);
1788         int tx_cleaned;
1789         int work_done = 0;
1790
1791         tx_cleaned = ixgb_clean_tx_irq(adapter);
1792         ixgb_clean_rx_irq(adapter, &work_done, work_to_do);
1793
1794         *budget -= work_done;
1795         netdev->quota -= work_done;
1796
1797         /* if no Tx and not enough Rx work done, exit the polling mode */
1798         if((!tx_cleaned && (work_done == 0)) || !netif_running(netdev)) {
1799                 netif_rx_complete(netdev);
1800                 ixgb_irq_enable(adapter);
1801                 return 0;
1802         }
1803
1804         return 1;
1805 }
1806 #endif
1807
1808 /**
1809  * ixgb_clean_tx_irq - Reclaim resources after transmit completes
1810  * @adapter: board private structure
1811  **/
1812
1813 static boolean_t
1814 ixgb_clean_tx_irq(struct ixgb_adapter *adapter)
1815 {
1816         struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
1817         struct net_device *netdev = adapter->netdev;
1818         struct ixgb_tx_desc *tx_desc, *eop_desc;
1819         struct ixgb_buffer *buffer_info;
1820         unsigned int i, eop;
1821         boolean_t cleaned = FALSE;
1822
1823         i = tx_ring->next_to_clean;
1824         eop = tx_ring->buffer_info[i].next_to_watch;
1825         eop_desc = IXGB_TX_DESC(*tx_ring, eop);
1826
1827         while(eop_desc->status & IXGB_TX_DESC_STATUS_DD) {
1828
1829                 for(cleaned = FALSE; !cleaned; ) {
1830                         tx_desc = IXGB_TX_DESC(*tx_ring, i);
1831                         buffer_info = &tx_ring->buffer_info[i];
1832
1833                         if (tx_desc->popts
1834                             & (IXGB_TX_DESC_POPTS_TXSM |
1835                                IXGB_TX_DESC_POPTS_IXSM))
1836                                 adapter->hw_csum_tx_good++;
1837
1838                         ixgb_unmap_and_free_tx_resource(adapter, buffer_info);
1839
1840                         *(uint32_t *)&(tx_desc->status) = 0;
1841
1842                         cleaned = (i == eop);
1843                         if(++i == tx_ring->count) i = 0;
1844                 }
1845
1846                 eop = tx_ring->buffer_info[i].next_to_watch;
1847                 eop_desc = IXGB_TX_DESC(*tx_ring, eop);
1848         }
1849
1850         tx_ring->next_to_clean = i;
1851
1852         if (unlikely(netif_queue_stopped(netdev))) {
1853                 spin_lock(&adapter->tx_lock);
1854                 if (netif_queue_stopped(netdev) && netif_carrier_ok(netdev) &&
1855                     (IXGB_DESC_UNUSED(tx_ring) >= DESC_NEEDED))
1856                         netif_wake_queue(netdev);
1857                 spin_unlock(&adapter->tx_lock);
1858         }
1859
1860         if(adapter->detect_tx_hung) {
1861                 /* detect a transmit hang in hardware, this serializes the
1862                  * check with the clearing of time_stamp and movement of i */
1863                 adapter->detect_tx_hung = FALSE;
1864                 if (tx_ring->buffer_info[eop].dma &&
1865                    time_after(jiffies, tx_ring->buffer_info[eop].time_stamp + HZ)
1866                    && !(IXGB_READ_REG(&adapter->hw, STATUS) &
1867                         IXGB_STATUS_TXOFF)) {
1868                         /* detected Tx unit hang */
1869                         DPRINTK(DRV, ERR, "Detected Tx Unit Hang\n"
1870                                         "  TDH                  <%x>\n"
1871                                         "  TDT                  <%x>\n"
1872                                         "  next_to_use          <%x>\n"
1873                                         "  next_to_clean        <%x>\n"
1874                                         "buffer_info[next_to_clean]\n"
1875                                         "  time_stamp           <%lx>\n"
1876                                         "  next_to_watch        <%x>\n"
1877                                         "  jiffies              <%lx>\n"
1878                                         "  next_to_watch.status <%x>\n",
1879                                 IXGB_READ_REG(&adapter->hw, TDH),
1880                                 IXGB_READ_REG(&adapter->hw, TDT),
1881                                 tx_ring->next_to_use,
1882                                 tx_ring->next_to_clean,
1883                                 tx_ring->buffer_info[eop].time_stamp,
1884                                 eop,
1885                                 jiffies,
1886                                 eop_desc->status);
1887                         netif_stop_queue(netdev);
1888                 }
1889         }
1890
1891         return cleaned;
1892 }
1893
1894 /**
1895  * ixgb_rx_checksum - Receive Checksum Offload for 82597.
1896  * @adapter: board private structure
1897  * @rx_desc: receive descriptor
1898  * @sk_buff: socket buffer with received data
1899  **/
1900
1901 static void
1902 ixgb_rx_checksum(struct ixgb_adapter *adapter,
1903                  struct ixgb_rx_desc *rx_desc,
1904                  struct sk_buff *skb)
1905 {
1906         /* Ignore Checksum bit is set OR
1907          * TCP Checksum has not been calculated
1908          */
1909         if((rx_desc->status & IXGB_RX_DESC_STATUS_IXSM) ||
1910            (!(rx_desc->status & IXGB_RX_DESC_STATUS_TCPCS))) {
1911                 skb->ip_summed = CHECKSUM_NONE;
1912                 return;
1913         }
1914
1915         /* At this point we know the hardware did the TCP checksum */
1916         /* now look at the TCP checksum error bit */
1917         if(rx_desc->errors & IXGB_RX_DESC_ERRORS_TCPE) {
1918                 /* let the stack verify checksum errors */
1919                 skb->ip_summed = CHECKSUM_NONE;
1920                 adapter->hw_csum_rx_error++;
1921         } else {
1922                 /* TCP checksum is good */
1923                 skb->ip_summed = CHECKSUM_UNNECESSARY;
1924                 adapter->hw_csum_rx_good++;
1925         }
1926 }
1927
1928 /**
1929  * ixgb_clean_rx_irq - Send received data up the network stack,
1930  * @adapter: board private structure
1931  **/
1932
1933 static boolean_t
1934 #ifdef CONFIG_IXGB_NAPI
1935 ixgb_clean_rx_irq(struct ixgb_adapter *adapter, int *work_done, int work_to_do)
1936 #else
1937 ixgb_clean_rx_irq(struct ixgb_adapter *adapter)
1938 #endif
1939 {
1940         struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
1941         struct net_device *netdev = adapter->netdev;
1942         struct pci_dev *pdev = adapter->pdev;
1943         struct ixgb_rx_desc *rx_desc, *next_rxd;
1944         struct ixgb_buffer *buffer_info, *next_buffer, *next2_buffer;
1945         uint32_t length;
1946         unsigned int i, j;
1947         boolean_t cleaned = FALSE;
1948
1949         i = rx_ring->next_to_clean;
1950         rx_desc = IXGB_RX_DESC(*rx_ring, i);
1951         buffer_info = &rx_ring->buffer_info[i];
1952
1953         while(rx_desc->status & IXGB_RX_DESC_STATUS_DD) {
1954                 struct sk_buff *skb, *next_skb;
1955                 u8 status;
1956
1957 #ifdef CONFIG_IXGB_NAPI
1958                 if(*work_done >= work_to_do)
1959                         break;
1960
1961                 (*work_done)++;
1962 #endif
1963                 status = rx_desc->status;
1964                 skb = buffer_info->skb;
1965                 buffer_info->skb = NULL;
1966
1967                 prefetch(skb->data);
1968
1969                 if(++i == rx_ring->count) i = 0;
1970                 next_rxd = IXGB_RX_DESC(*rx_ring, i);
1971                 prefetch(next_rxd);
1972
1973                 if((j = i + 1) == rx_ring->count) j = 0;
1974                 next2_buffer = &rx_ring->buffer_info[j];
1975                 prefetch(next2_buffer);
1976
1977                 next_buffer = &rx_ring->buffer_info[i];
1978                 next_skb = next_buffer->skb;
1979                 prefetch(next_skb);
1980
1981                 cleaned = TRUE;
1982
1983                 pci_unmap_single(pdev,
1984                                  buffer_info->dma,
1985                                  buffer_info->length,
1986                                  PCI_DMA_FROMDEVICE);
1987
1988                 length = le16_to_cpu(rx_desc->length);
1989
1990                 if(unlikely(!(status & IXGB_RX_DESC_STATUS_EOP))) {
1991
1992                         /* All receives must fit into a single buffer */
1993
1994                         IXGB_DBG("Receive packet consumed multiple buffers "
1995                                          "length<%x>\n", length);
1996
1997                         dev_kfree_skb_irq(skb);
1998                         goto rxdesc_done;
1999                 }
2000
2001                 if (unlikely(rx_desc->errors
2002                              & (IXGB_RX_DESC_ERRORS_CE | IXGB_RX_DESC_ERRORS_SE
2003                                 | IXGB_RX_DESC_ERRORS_P |
2004                                 IXGB_RX_DESC_ERRORS_RXE))) {
2005
2006                         dev_kfree_skb_irq(skb);
2007                         goto rxdesc_done;
2008                 }
2009
2010                 /* code added for copybreak, this should improve
2011                  * performance for small packets with large amounts
2012                  * of reassembly being done in the stack */
2013 #define IXGB_CB_LENGTH 256
2014                 if (length < IXGB_CB_LENGTH) {
2015                         struct sk_buff *new_skb =
2016                             netdev_alloc_skb(netdev, length + NET_IP_ALIGN);
2017                         if (new_skb) {
2018                                 skb_reserve(new_skb, NET_IP_ALIGN);
2019                                 memcpy(new_skb->data - NET_IP_ALIGN,
2020                                        skb->data - NET_IP_ALIGN,
2021                                        length + NET_IP_ALIGN);
2022                                 /* save the skb in buffer_info as good */
2023                                 buffer_info->skb = skb;
2024                                 skb = new_skb;
2025                         }
2026                 }
2027                 /* end copybreak code */
2028
2029                 /* Good Receive */
2030                 skb_put(skb, length);
2031
2032                 /* Receive Checksum Offload */
2033                 ixgb_rx_checksum(adapter, rx_desc, skb);
2034
2035                 skb->protocol = eth_type_trans(skb, netdev);
2036 #ifdef CONFIG_IXGB_NAPI
2037                 if(adapter->vlgrp && (status & IXGB_RX_DESC_STATUS_VP)) {
2038                         vlan_hwaccel_receive_skb(skb, adapter->vlgrp,
2039                                 le16_to_cpu(rx_desc->special) &
2040                                         IXGB_RX_DESC_SPECIAL_VLAN_MASK);
2041                 } else {
2042                         netif_receive_skb(skb);
2043                 }
2044 #else /* CONFIG_IXGB_NAPI */
2045                 if(adapter->vlgrp && (status & IXGB_RX_DESC_STATUS_VP)) {
2046                         vlan_hwaccel_rx(skb, adapter->vlgrp,
2047                                 le16_to_cpu(rx_desc->special) &
2048                                         IXGB_RX_DESC_SPECIAL_VLAN_MASK);
2049                 } else {
2050                         netif_rx(skb);
2051                 }
2052 #endif /* CONFIG_IXGB_NAPI */
2053                 netdev->last_rx = jiffies;
2054
2055 rxdesc_done:
2056                 /* clean up descriptor, might be written over by hw */
2057                 rx_desc->status = 0;
2058
2059                 /* use prefetched values */
2060                 rx_desc = next_rxd;
2061                 buffer_info = next_buffer;
2062         }
2063
2064         rx_ring->next_to_clean = i;
2065
2066         ixgb_alloc_rx_buffers(adapter);
2067
2068         return cleaned;
2069 }
2070
2071 /**
2072  * ixgb_alloc_rx_buffers - Replace used receive buffers
2073  * @adapter: address of board private structure
2074  **/
2075
2076 static void
2077 ixgb_alloc_rx_buffers(struct ixgb_adapter *adapter)
2078 {
2079         struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
2080         struct net_device *netdev = adapter->netdev;
2081         struct pci_dev *pdev = adapter->pdev;
2082         struct ixgb_rx_desc *rx_desc;
2083         struct ixgb_buffer *buffer_info;
2084         struct sk_buff *skb;
2085         unsigned int i;
2086         int num_group_tail_writes;
2087         long cleancount;
2088
2089         i = rx_ring->next_to_use;
2090         buffer_info = &rx_ring->buffer_info[i];
2091         cleancount = IXGB_DESC_UNUSED(rx_ring);
2092
2093         num_group_tail_writes = IXGB_RX_BUFFER_WRITE;
2094
2095         /* leave three descriptors unused */
2096         while(--cleancount > 2) {
2097                 /* recycle! its good for you */
2098                 skb = buffer_info->skb;
2099                 if (skb) {
2100                         skb_trim(skb, 0);
2101                         goto map_skb;
2102                 }
2103
2104                 skb = netdev_alloc_skb(netdev, adapter->rx_buffer_len
2105                                        + NET_IP_ALIGN);
2106                 if (unlikely(!skb)) {
2107                         /* Better luck next round */
2108                         adapter->alloc_rx_buff_failed++;
2109                         break;
2110                 }
2111
2112                 /* Make buffer alignment 2 beyond a 16 byte boundary
2113                  * this will result in a 16 byte aligned IP header after
2114                  * the 14 byte MAC header is removed
2115                  */
2116                 skb_reserve(skb, NET_IP_ALIGN);
2117
2118                 buffer_info->skb = skb;
2119                 buffer_info->length = adapter->rx_buffer_len;
2120 map_skb:
2121                 buffer_info->dma = pci_map_single(pdev,
2122                                                   skb->data,
2123                                                   adapter->rx_buffer_len,
2124                                                   PCI_DMA_FROMDEVICE);
2125
2126                 rx_desc = IXGB_RX_DESC(*rx_ring, i);
2127                 rx_desc->buff_addr = cpu_to_le64(buffer_info->dma);
2128                 /* guarantee DD bit not set now before h/w gets descriptor
2129                  * this is the rest of the workaround for h/w double
2130                  * writeback. */
2131                 rx_desc->status = 0;
2132
2133
2134                 if(++i == rx_ring->count) i = 0;
2135                 buffer_info = &rx_ring->buffer_info[i];
2136         }
2137
2138         if (likely(rx_ring->next_to_use != i)) {
2139                 rx_ring->next_to_use = i;
2140                 if (unlikely(i-- == 0))
2141                         i = (rx_ring->count - 1);
2142
2143                 /* Force memory writes to complete before letting h/w
2144                  * know there are new descriptors to fetch.  (Only
2145                  * applicable for weak-ordered memory model archs, such
2146                  * as IA-64). */
2147                 wmb();
2148                 IXGB_WRITE_REG(&adapter->hw, RDT, i);
2149         }
2150 }
2151
2152 /**
2153  * ixgb_vlan_rx_register - enables or disables vlan tagging/stripping.
2154  *
2155  * @param netdev network interface device structure
2156  * @param grp indicates to enable or disable tagging/stripping
2157  **/
2158 static void
2159 ixgb_vlan_rx_register(struct net_device *netdev, struct vlan_group *grp)
2160 {
2161         struct ixgb_adapter *adapter = netdev_priv(netdev);
2162         uint32_t ctrl, rctl;
2163
2164         ixgb_irq_disable(adapter);
2165         adapter->vlgrp = grp;
2166
2167         if(grp) {
2168                 /* enable VLAN tag insert/strip */
2169                 ctrl = IXGB_READ_REG(&adapter->hw, CTRL0);
2170                 ctrl |= IXGB_CTRL0_VME;
2171                 IXGB_WRITE_REG(&adapter->hw, CTRL0, ctrl);
2172
2173                 /* enable VLAN receive filtering */
2174
2175                 rctl = IXGB_READ_REG(&adapter->hw, RCTL);
2176                 rctl |= IXGB_RCTL_VFE;
2177                 rctl &= ~IXGB_RCTL_CFIEN;
2178                 IXGB_WRITE_REG(&adapter->hw, RCTL, rctl);
2179         } else {
2180                 /* disable VLAN tag insert/strip */
2181
2182                 ctrl = IXGB_READ_REG(&adapter->hw, CTRL0);
2183                 ctrl &= ~IXGB_CTRL0_VME;
2184                 IXGB_WRITE_REG(&adapter->hw, CTRL0, ctrl);
2185
2186                 /* disable VLAN filtering */
2187
2188                 rctl = IXGB_READ_REG(&adapter->hw, RCTL);
2189                 rctl &= ~IXGB_RCTL_VFE;
2190                 IXGB_WRITE_REG(&adapter->hw, RCTL, rctl);
2191         }
2192
2193         ixgb_irq_enable(adapter);
2194 }
2195
2196 static void
2197 ixgb_vlan_rx_add_vid(struct net_device *netdev, uint16_t vid)
2198 {
2199         struct ixgb_adapter *adapter = netdev_priv(netdev);
2200         uint32_t vfta, index;
2201
2202         /* add VID to filter table */
2203
2204         index = (vid >> 5) & 0x7F;
2205         vfta = IXGB_READ_REG_ARRAY(&adapter->hw, VFTA, index);
2206         vfta |= (1 << (vid & 0x1F));
2207         ixgb_write_vfta(&adapter->hw, index, vfta);
2208 }
2209
2210 static void
2211 ixgb_vlan_rx_kill_vid(struct net_device *netdev, uint16_t vid)
2212 {
2213         struct ixgb_adapter *adapter = netdev_priv(netdev);
2214         uint32_t vfta, index;
2215
2216         ixgb_irq_disable(adapter);
2217
2218         vlan_group_set_device(adapter->vlgrp, vid, NULL);
2219
2220         ixgb_irq_enable(adapter);
2221
2222         /* remove VID from filter table*/
2223
2224         index = (vid >> 5) & 0x7F;
2225         vfta = IXGB_READ_REG_ARRAY(&adapter->hw, VFTA, index);
2226         vfta &= ~(1 << (vid & 0x1F));
2227         ixgb_write_vfta(&adapter->hw, index, vfta);
2228 }
2229
2230 static void
2231 ixgb_restore_vlan(struct ixgb_adapter *adapter)
2232 {
2233         ixgb_vlan_rx_register(adapter->netdev, adapter->vlgrp);
2234
2235         if(adapter->vlgrp) {
2236                 uint16_t vid;
2237                 for(vid = 0; vid < VLAN_GROUP_ARRAY_LEN; vid++) {
2238                         if(!vlan_group_get_device(adapter->vlgrp, vid))
2239                                 continue;
2240                         ixgb_vlan_rx_add_vid(adapter->netdev, vid);
2241                 }
2242         }
2243 }
2244
2245 #ifdef CONFIG_NET_POLL_CONTROLLER
2246 /*
2247  * Polling 'interrupt' - used by things like netconsole to send skbs
2248  * without having to re-enable interrupts. It's not called while
2249  * the interrupt routine is executing.
2250  */
2251
2252 static void ixgb_netpoll(struct net_device *dev)
2253 {
2254         struct ixgb_adapter *adapter = netdev_priv(dev);
2255
2256         disable_irq(adapter->pdev->irq);
2257         ixgb_intr(adapter->pdev->irq, dev);
2258         enable_irq(adapter->pdev->irq);
2259 }
2260 #endif
2261
2262 /**
2263  * ixgb_io_error_detected() - called when PCI error is detected
2264  * @pdev    pointer to pci device with error
2265  * @state   pci channel state after error
2266  *
2267  * This callback is called by the PCI subsystem whenever
2268  * a PCI bus error is detected.
2269  */
2270 static pci_ers_result_t ixgb_io_error_detected (struct pci_dev *pdev,
2271                                      enum pci_channel_state state)
2272 {
2273         struct net_device *netdev = pci_get_drvdata(pdev);
2274         struct ixgb_adapter *adapter = netdev_priv(netdev);
2275
2276         if(netif_running(netdev))
2277                 ixgb_down(adapter, TRUE);
2278
2279         pci_disable_device(pdev);
2280
2281         /* Request a slot reset. */
2282         return PCI_ERS_RESULT_NEED_RESET;
2283 }
2284
2285 /**
2286  * ixgb_io_slot_reset - called after the pci bus has been reset.
2287  * @pdev    pointer to pci device with error
2288  *
2289  * This callback is called after the PCI buss has been reset.
2290  * Basically, this tries to restart the card from scratch.
2291  * This is a shortened version of the device probe/discovery code,
2292  * it resembles the first-half of the ixgb_probe() routine.
2293  */
2294 static pci_ers_result_t ixgb_io_slot_reset (struct pci_dev *pdev)
2295 {
2296         struct net_device *netdev = pci_get_drvdata(pdev);
2297         struct ixgb_adapter *adapter = netdev_priv(netdev);
2298
2299         if(pci_enable_device(pdev)) {
2300                 DPRINTK(PROBE, ERR, "Cannot re-enable PCI device after reset.\n");
2301                 return PCI_ERS_RESULT_DISCONNECT;
2302         }
2303
2304         /* Perform card reset only on one instance of the card */
2305         if (0 != PCI_FUNC (pdev->devfn))
2306                 return PCI_ERS_RESULT_RECOVERED;
2307
2308         pci_set_master(pdev);
2309
2310         netif_carrier_off(netdev);
2311         netif_stop_queue(netdev);
2312         ixgb_reset(adapter);
2313
2314         /* Make sure the EEPROM is good */
2315         if(!ixgb_validate_eeprom_checksum(&adapter->hw)) {
2316                 DPRINTK(PROBE, ERR, "After reset, the EEPROM checksum is not valid.\n");
2317                 return PCI_ERS_RESULT_DISCONNECT;
2318         }
2319         ixgb_get_ee_mac_addr(&adapter->hw, netdev->dev_addr);
2320         memcpy(netdev->perm_addr, netdev->dev_addr, netdev->addr_len);
2321
2322         if(!is_valid_ether_addr(netdev->perm_addr)) {
2323                 DPRINTK(PROBE, ERR, "After reset, invalid MAC address.\n");
2324                 return PCI_ERS_RESULT_DISCONNECT;
2325         }
2326
2327         return PCI_ERS_RESULT_RECOVERED;
2328 }
2329
2330 /**
2331  * ixgb_io_resume - called when its OK to resume normal operations
2332  * @pdev    pointer to pci device with error
2333  *
2334  * The error recovery driver tells us that its OK to resume
2335  * normal operation. Implementation resembles the second-half
2336  * of the ixgb_probe() routine.
2337  */
2338 static void ixgb_io_resume (struct pci_dev *pdev)
2339 {
2340         struct net_device *netdev = pci_get_drvdata(pdev);
2341         struct ixgb_adapter *adapter = netdev_priv(netdev);
2342
2343         pci_set_master(pdev);
2344
2345         if(netif_running(netdev)) {
2346                 if(ixgb_up(adapter)) {
2347                         printk ("ixgb: can't bring device back up after reset\n");
2348                         return;
2349                 }
2350         }
2351
2352         netif_device_attach(netdev);
2353         mod_timer(&adapter->watchdog_timer, jiffies);
2354 }
2355
2356 /* ixgb_main.c */