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-k4"DRIVERNAPI
  40 const char ixgb_driver_version[] = DRV_VERSION;
  41 static const 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 napi_struct *napi, 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 static void ixgb_tx_timeout(struct net_device *dev);
 108 static void ixgb_tx_timeout_task(struct work_struct *work);
 109 static void ixgb_vlan_rx_register(struct net_device *netdev,
 110                                   struct vlan_group *grp);
 111 static void ixgb_vlan_rx_add_vid(struct net_device *netdev, uint16_t vid);
 112 static void ixgb_vlan_rx_kill_vid(struct net_device *netdev, uint16_t vid);
 113 static void ixgb_restore_vlan(struct ixgb_adapter *adapter);
 114
 115 #ifdef CONFIG_NET_POLL_CONTROLLER
 116 /* for netdump / net console */
 117 static void ixgb_netpoll(struct net_device *dev);
 118 #endif
 119
 120 static pci_ers_result_t ixgb_io_error_detected (struct pci_dev *pdev,
 121                              enum pci_channel_state state);
 122 static pci_ers_result_t ixgb_io_slot_reset (struct pci_dev *pdev);
 123 static void ixgb_io_resume (struct pci_dev *pdev);
 124
 125 static struct pci_error_handlers ixgb_err_handler = {
 126         .error_detected = ixgb_io_error_detected,
 127         .slot_reset = ixgb_io_slot_reset,
 128         .resume = ixgb_io_resume,
 129 };
 130
 131 static struct pci_driver ixgb_driver = {
 132         .name     = ixgb_driver_name,
 133         .id_table = ixgb_pci_tbl,
 134         .probe    = ixgb_probe,
 135         .remove   = __devexit_p(ixgb_remove),
 136         .err_handler = &ixgb_err_handler
 137 };
 138
 139 MODULE_AUTHOR("Intel Corporation, <linux.nics@intel.com>");
 140 MODULE_DESCRIPTION("Intel(R) PRO/10GbE Network Driver");
 141 MODULE_LICENSE("GPL");
 142 MODULE_VERSION(DRV_VERSION);
 143
 144 #define DEFAULT_DEBUG_LEVEL_SHIFT 3
 145 static int debug = DEFAULT_DEBUG_LEVEL_SHIFT;
 146 module_param(debug, int, 0);
 147 MODULE_PARM_DESC(debug, "Debug level (0=none,...,16=all)");
 148
 149 /* some defines for controlling descriptor fetches in h/w */
 150 #define RXDCTL_WTHRESH_DEFAULT 15  /* chip writes back at this many or RXT0 */
 151 #define RXDCTL_PTHRESH_DEFAULT 0   /* chip considers prefech below
 152                                     * this */
 153 #define RXDCTL_HTHRESH_DEFAULT 0   /* chip will only prefetch if tail
 154                                     * is pushed this many descriptors
 155                                     * from head */
 156
 157 /**
 158  * ixgb_init_module - Driver Registration Routine
 159  *
 160  * ixgb_init_module is the first routine called when the driver is
 161  * loaded. All it does is register with the PCI subsystem.
 162  **/
 163
 164 static int __init
 165 ixgb_init_module(void)
 166 {
 167         printk(KERN_INFO "%s - version %s\n",
 168                ixgb_driver_string, ixgb_driver_version);
 169
 170         printk(KERN_INFO "%s\n", ixgb_copyright);
 171
 172         return pci_register_driver(&ixgb_driver);
 173 }
 174
 175 module_init(ixgb_init_module);
 176
 177 /**
 178  * ixgb_exit_module - Driver Exit Cleanup Routine
 179  *
 180  * ixgb_exit_module is called just before the driver is removed
 181  * from memory.
 182  **/
 183
 184 static void __exit
 185 ixgb_exit_module(void)
 186 {
 187         pci_unregister_driver(&ixgb_driver);
 188 }
 189
 190 module_exit(ixgb_exit_module);
 191
 192 /**
 193  * ixgb_irq_disable - Mask off interrupt generation on the NIC
 194  * @adapter: board private structure
 195  **/
 196
 197 static void
 198 ixgb_irq_disable(struct ixgb_adapter *adapter)
 199 {
 200         atomic_inc(&adapter->irq_sem);
 201         IXGB_WRITE_REG(&adapter->hw, IMC, ~0);
 202         IXGB_WRITE_FLUSH(&adapter->hw);
 203         synchronize_irq(adapter->pdev->irq);
 204 }
 205
 206 /**
 207  * ixgb_irq_enable - Enable default interrupt generation settings
 208  * @adapter: board private structure
 209  **/
 210
 211 static void
 212 ixgb_irq_enable(struct ixgb_adapter *adapter)
 213 {
 214         if(atomic_dec_and_test(&adapter->irq_sem)) {
 215                 u32 val = IXGB_INT_RXT0 | IXGB_INT_RXDMT0 |
 216                           IXGB_INT_TXDW | IXGB_INT_LSC;
 217                 if (adapter->hw.subsystem_vendor_id == SUN_SUBVENDOR_ID)
 218                         val |= IXGB_INT_GPI0;
 219                 IXGB_WRITE_REG(&adapter->hw, IMS, val);
 220                 IXGB_WRITE_FLUSH(&adapter->hw);
 221         }
 222 }
 223
 224 int
 225 ixgb_up(struct ixgb_adapter *adapter)
 226 {
 227         struct net_device *netdev = adapter->netdev;
 228         int err, irq_flags = IRQF_SHARED;
 229         int max_frame = netdev->mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;
 230         struct ixgb_hw *hw = &adapter->hw;
 231
 232         /* hardware has been reset, we need to reload some things */
 233
 234         ixgb_rar_set(hw, netdev->dev_addr, 0);
 235         ixgb_set_multi(netdev);
 236
 237         ixgb_restore_vlan(adapter);
 238
 239         ixgb_configure_tx(adapter);
 240         ixgb_setup_rctl(adapter);
 241         ixgb_configure_rx(adapter);
 242         ixgb_alloc_rx_buffers(adapter);
 243
 244         /* disable interrupts and get the hardware into a known state */
 245         IXGB_WRITE_REG(&adapter->hw, IMC, 0xffffffff);
 246
 247         /* only enable MSI if bus is in PCI-X mode */
 248         if (IXGB_READ_REG(&adapter->hw, STATUS) & IXGB_STATUS_PCIX_MODE) {
 249                 err = pci_enable_msi(adapter->pdev);
 250                 if (!err) {
 251                         adapter->have_msi = 1;
 252                         irq_flags = 0;
 253                 }
 254                 /* proceed to try to request regular interrupt */
 255         }
 256
 257         err = request_irq(adapter->pdev->irq, &ixgb_intr, irq_flags,
 258                           netdev->name, netdev);
 259         if (err) {
 260                 if (adapter->have_msi)
 261                         pci_disable_msi(adapter->pdev);
 262                 DPRINTK(PROBE, ERR,
 263                  "Unable to allocate interrupt Error: %d\n", err);
 264                 return err;
 265         }
 266
 267         if((hw->max_frame_size != max_frame) ||
 268                 (hw->max_frame_size !=
 269                 (IXGB_READ_REG(hw, MFS) >> IXGB_MFS_SHIFT))) {
 270
 271                 hw->max_frame_size = max_frame;
 272
 273                 IXGB_WRITE_REG(hw, MFS, hw->max_frame_size << IXGB_MFS_SHIFT);
 274
 275                 if(hw->max_frame_size >
 276                    IXGB_MAX_ENET_FRAME_SIZE_WITHOUT_FCS + ENET_FCS_LENGTH) {
 277                         uint32_t ctrl0 = IXGB_READ_REG(hw, CTRL0);
 278
 279                         if(!(ctrl0 & IXGB_CTRL0_JFE)) {
 280                                 ctrl0 |= IXGB_CTRL0_JFE;
 281                                 IXGB_WRITE_REG(hw, CTRL0, ctrl0);
 282                         }
 283                 }
 284         }
 285
 286         mod_timer(&adapter->watchdog_timer, jiffies);
 287
 288 #ifdef CONFIG_IXGB_NAPI
 289         napi_enable(&adapter->napi);
 290 #endif
 291         ixgb_irq_enable(adapter);
 292
 293         return 0;
 294 }
 295
 296 void
 297 ixgb_down(struct ixgb_adapter *adapter, boolean_t kill_watchdog)
 298 {
 299         struct net_device *netdev = adapter->netdev;
 300
 301 #ifdef CONFIG_IXGB_NAPI
 302         napi_disable(&adapter->napi);
 303         atomic_set(&adapter->irq_sem, 0);
 304 #endif
 305
 306         ixgb_irq_disable(adapter);
 307         free_irq(adapter->pdev->irq, netdev);
 308
 309         if (adapter->have_msi)
 310                 pci_disable_msi(adapter->pdev);
 311
 312         if(kill_watchdog)
 313                 del_timer_sync(&adapter->watchdog_timer);
 314
 315         adapter->link_speed = 0;
 316         adapter->link_duplex = 0;
 317         netif_carrier_off(netdev);
 318         netif_stop_queue(netdev);
 319
 320         ixgb_reset(adapter);
 321         ixgb_clean_tx_ring(adapter);
 322         ixgb_clean_rx_ring(adapter);
 323 }
 324
 325 void
 326 ixgb_reset(struct ixgb_adapter *adapter)
 327 {
 328         struct ixgb_hw *hw = &adapter->hw;
 329
 330         ixgb_adapter_stop(hw);
 331         if (!ixgb_init_hw(hw))
 332                 DPRINTK(PROBE, ERR, "ixgb_init_hw failed.\n");
 333
 334         /* restore frame size information */
 335         IXGB_WRITE_REG(hw, MFS, hw->max_frame_size << IXGB_MFS_SHIFT);
 336         if (hw->max_frame_size >
 337             IXGB_MAX_ENET_FRAME_SIZE_WITHOUT_FCS + ENET_FCS_LENGTH) {
 338                 u32 ctrl0 = IXGB_READ_REG(hw, CTRL0);
 339                 if (!(ctrl0 & IXGB_CTRL0_JFE)) {
 340                         ctrl0 |= IXGB_CTRL0_JFE;
 341                         IXGB_WRITE_REG(hw, CTRL0, ctrl0);
 342                 }
 343         }
 344 }
 345
 346 /**
 347  * ixgb_probe - Device Initialization Routine
 348  * @pdev: PCI device information struct
 349  * @ent: entry in ixgb_pci_tbl
 350  *
 351  * Returns 0 on success, negative on failure
 352  *
 353  * ixgb_probe initializes an adapter identified by a pci_dev structure.
 354  * The OS initialization, configuring of the adapter private structure,
 355  * and a hardware reset occur.
 356  **/
 357
 358 static int __devinit
 359 ixgb_probe(struct pci_dev *pdev,
 360                 const struct pci_device_id *ent)
 361 {
 362         struct net_device *netdev = NULL;
 363         struct ixgb_adapter *adapter;
 364         static int cards_found = 0;
 365         unsigned long mmio_start;
 366         int mmio_len;
 367         int pci_using_dac;
 368         int i;
 369         int err;
 370
 371         if((err = pci_enable_device(pdev)))
 372                 return err;
 373
 374         if(!(err = pci_set_dma_mask(pdev, DMA_64BIT_MASK)) &&
 375            !(err = pci_set_consistent_dma_mask(pdev, DMA_64BIT_MASK))) {
 376                 pci_using_dac = 1;
 377         } else {
 378                 if((err = pci_set_dma_mask(pdev, DMA_32BIT_MASK)) ||
 379                    (err = pci_set_consistent_dma_mask(pdev, DMA_32BIT_MASK))) {
 380                         printk(KERN_ERR
 381                          "ixgb: No usable DMA configuration, aborting\n");
 382                         goto err_dma_mask;
 383                 }
 384                 pci_using_dac = 0;
 385         }
 386
 387         if((err = pci_request_regions(pdev, ixgb_driver_name)))
 388                 goto err_request_regions;
 389
 390         pci_set_master(pdev);
 391
 392         netdev = alloc_etherdev(sizeof(struct ixgb_adapter));
 393         if(!netdev) {
 394                 err = -ENOMEM;
 395                 goto err_alloc_etherdev;
 396         }
 397
 398         SET_NETDEV_DEV(netdev, &pdev->dev);
 399
 400         pci_set_drvdata(pdev, netdev);
 401         adapter = netdev_priv(netdev);
 402         adapter->netdev = netdev;
 403         adapter->pdev = pdev;
 404         adapter->hw.back = adapter;
 405         adapter->msg_enable = netif_msg_init(debug, DEFAULT_DEBUG_LEVEL_SHIFT);
 406
 407         mmio_start = pci_resource_start(pdev, BAR_0);
 408         mmio_len = pci_resource_len(pdev, BAR_0);
 409
 410         adapter->hw.hw_addr = ioremap(mmio_start, mmio_len);
 411         if(!adapter->hw.hw_addr) {
 412                 err = -EIO;
 413                 goto err_ioremap;
 414         }
 415
 416         for(i = BAR_1; i <= BAR_5; i++) {
 417                 if(pci_resource_len(pdev, i) == 0)
 418                         continue;
 419                 if(pci_resource_flags(pdev, i) & IORESOURCE_IO) {
 420                         adapter->hw.io_base = pci_resource_start(pdev, i);
 421                         break;
 422                 }
 423         }
 424
 425         netdev->open = &ixgb_open;
 426         netdev->stop = &ixgb_close;
 427         netdev->hard_start_xmit = &ixgb_xmit_frame;
 428         netdev->get_stats = &ixgb_get_stats;
 429         netdev->set_multicast_list = &ixgb_set_multi;
 430         netdev->set_mac_address = &ixgb_set_mac;
 431         netdev->change_mtu = &ixgb_change_mtu;
 432         ixgb_set_ethtool_ops(netdev);
 433         netdev->tx_timeout = &ixgb_tx_timeout;
 434         netdev->watchdog_timeo = 5 * HZ;
 435 #ifdef CONFIG_IXGB_NAPI
 436         netif_napi_add(netdev, &adapter->napi, ixgb_clean, 64);
 437 #endif
 438         netdev->vlan_rx_register = ixgb_vlan_rx_register;
 439         netdev->vlan_rx_add_vid = ixgb_vlan_rx_add_vid;
 440         netdev->vlan_rx_kill_vid = ixgb_vlan_rx_kill_vid;
 441 #ifdef CONFIG_NET_POLL_CONTROLLER
 442         netdev->poll_controller = ixgb_netpoll;
 443 #endif
 444
 445         strncpy(netdev->name, pci_name(pdev), sizeof(netdev->name) - 1);
 446         netdev->mem_start = mmio_start;
 447         netdev->mem_end = mmio_start + mmio_len;
 448         netdev->base_addr = adapter->hw.io_base;
 449
 450         adapter->bd_number = cards_found;
 451         adapter->link_speed = 0;
 452         adapter->link_duplex = 0;
 453
 454         /* setup the private structure */
 455
 456         if((err = ixgb_sw_init(adapter)))
 457                 goto err_sw_init;
 458
 459         netdev->features = NETIF_F_SG |
 460                            NETIF_F_HW_CSUM |
 461                            NETIF_F_HW_VLAN_TX |
 462                            NETIF_F_HW_VLAN_RX |
 463                            NETIF_F_HW_VLAN_FILTER;
 464         netdev->features |= NETIF_F_TSO;
 465 #ifdef NETIF_F_LLTX
 466         netdev->features |= NETIF_F_LLTX;
 467 #endif
 468
 469         if(pci_using_dac)
 470                 netdev->features |= NETIF_F_HIGHDMA;
 471
 472         /* make sure the EEPROM is good */
 473
 474         if(!ixgb_validate_eeprom_checksum(&adapter->hw)) {
 475                 DPRINTK(PROBE, ERR, "The EEPROM Checksum Is Not Valid\n");
 476                 err = -EIO;
 477                 goto err_eeprom;
 478         }
 479
 480         ixgb_get_ee_mac_addr(&adapter->hw, netdev->dev_addr);
 481         memcpy(netdev->perm_addr, netdev->dev_addr, netdev->addr_len);
 482
 483         if(!is_valid_ether_addr(netdev->perm_addr)) {
 484                 DPRINTK(PROBE, ERR, "Invalid MAC Address\n");
 485                 err = -EIO;
 486                 goto err_eeprom;
 487         }
 488
 489         adapter->part_num = ixgb_get_ee_pba_number(&adapter->hw);
 490
 491         init_timer(&adapter->watchdog_timer);
 492         adapter->watchdog_timer.function = &ixgb_watchdog;
 493         adapter->watchdog_timer.data = (unsigned long)adapter;
 494
 495         INIT_WORK(&adapter->tx_timeout_task, ixgb_tx_timeout_task);
 496
 497         strcpy(netdev->name, "eth%d");
 498         if((err = register_netdev(netdev)))
 499                 goto err_register;
 500
 501         /* we're going to reset, so assume we have no link for now */
 502
 503         netif_carrier_off(netdev);
 504         netif_stop_queue(netdev);
 505
 506         DPRINTK(PROBE, INFO, "Intel(R) PRO/10GbE Network Connection\n");
 507         ixgb_check_options(adapter);
 508         /* reset the hardware with the new settings */
 509
 510         ixgb_reset(adapter);
 511
 512         cards_found++;
 513         return 0;
 514
 515 err_register:
 516 err_sw_init:
 517 err_eeprom:
 518         iounmap(adapter->hw.hw_addr);
 519 err_ioremap:
 520         free_netdev(netdev);
 521 err_alloc_etherdev:
 522         pci_release_regions(pdev);
 523 err_request_regions:
 524 err_dma_mask:
 525         pci_disable_device(pdev);
 526         return err;
 527 }
 528
 529 /**
 530  * ixgb_remove - Device Removal Routine
 531  * @pdev: PCI device information struct
 532  *
 533  * ixgb_remove is called by the PCI subsystem to alert the driver
 534  * that it should release a PCI device.  The could be caused by a
 535  * Hot-Plug event, or because the driver is going to be removed from
 536  * memory.
 537  **/
 538
 539 static void __devexit
 540 ixgb_remove(struct pci_dev *pdev)
 541 {
 542         struct net_device *netdev = pci_get_drvdata(pdev);
 543         struct ixgb_adapter *adapter = netdev_priv(netdev);
 544
 545         unregister_netdev(netdev);
 546
 547         iounmap(adapter->hw.hw_addr);
 548         pci_release_regions(pdev);
 549
 550         free_netdev(netdev);
 551 }
 552
 553 /**
 554  * ixgb_sw_init - Initialize general software structures (struct ixgb_adapter)
 555  * @adapter: board private structure to initialize
 556  *
 557  * ixgb_sw_init initializes the Adapter private data structure.
 558  * Fields are initialized based on PCI device information and
 559  * OS network device settings (MTU size).
 560  **/
 561
 562 static int __devinit
 563 ixgb_sw_init(struct ixgb_adapter *adapter)
 564 {
 565         struct ixgb_hw *hw = &adapter->hw;
 566         struct net_device *netdev = adapter->netdev;
 567         struct pci_dev *pdev = adapter->pdev;
 568
 569         /* PCI config space info */
 570
 571         hw->vendor_id = pdev->vendor;
 572         hw->device_id = pdev->device;
 573         hw->subsystem_vendor_id = pdev->subsystem_vendor;
 574         hw->subsystem_id = pdev->subsystem_device;
 575
 576         hw->max_frame_size = netdev->mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;
 577         adapter->rx_buffer_len = hw->max_frame_size;
 578
 579         if((hw->device_id == IXGB_DEVICE_ID_82597EX)
 580            || (hw->device_id == IXGB_DEVICE_ID_82597EX_CX4)
 581            || (hw->device_id == IXGB_DEVICE_ID_82597EX_LR)
 582            || (hw->device_id == IXGB_DEVICE_ID_82597EX_SR))
 583                         hw->mac_type = ixgb_82597;
 584         else {
 585                 /* should never have loaded on this device */
 586                 DPRINTK(PROBE, ERR, "unsupported device id\n");
 587         }
 588
 589         /* enable flow control to be programmed */
 590         hw->fc.send_xon = 1;
 591
 592         atomic_set(&adapter->irq_sem, 1);
 593         spin_lock_init(&adapter->tx_lock);
 594
 595         return 0;
 596 }
 597
 598 /**
 599  * ixgb_open - Called when a network interface is made active
 600  * @netdev: network interface device structure
 601  *
 602  * Returns 0 on success, negative value on failure
 603  *
 604  * The open entry point is called when a network interface is made
 605  * active by the system (IFF_UP).  At this point all resources needed
 606  * for transmit and receive operations are allocated, the interrupt
 607  * handler is registered with the OS, the watchdog timer is started,
 608  * and the stack is notified that the interface is ready.
 609  **/
 610
 611 static int
 612 ixgb_open(struct net_device *netdev)
 613 {
 614         struct ixgb_adapter *adapter = netdev_priv(netdev);
 615         int err;
 616
 617         /* allocate transmit descriptors */
 618
 619         if((err = ixgb_setup_tx_resources(adapter)))
 620                 goto err_setup_tx;
 621
 622         /* allocate receive descriptors */
 623
 624         if((err = ixgb_setup_rx_resources(adapter)))
 625                 goto err_setup_rx;
 626
 627         if((err = ixgb_up(adapter)))
 628                 goto err_up;
 629
 630         return 0;
 631
 632 err_up:
 633         ixgb_free_rx_resources(adapter);
 634 err_setup_rx:
 635         ixgb_free_tx_resources(adapter);
 636 err_setup_tx:
 637         ixgb_reset(adapter);
 638
 639         return err;
 640 }
 641
 642 /**
 643  * ixgb_close - Disables a network interface
 644  * @netdev: network interface device structure
 645  *
 646  * Returns 0, this is not allowed to fail
 647  *
 648  * The close entry point is called when an interface is de-activated
 649  * by the OS.  The hardware is still under the drivers control, but
 650  * needs to be disabled.  A global MAC reset is issued to stop the
 651  * hardware, and all transmit and receive resources are freed.
 652  **/
 653
 654 static int
 655 ixgb_close(struct net_device *netdev)
 656 {
 657         struct ixgb_adapter *adapter = netdev_priv(netdev);
 658
 659         ixgb_down(adapter, TRUE);
 660
 661         ixgb_free_tx_resources(adapter);
 662         ixgb_free_rx_resources(adapter);
 663
 664         return 0;
 665 }
 666
 667 /**
 668  * ixgb_setup_tx_resources - allocate Tx resources (Descriptors)
 669  * @adapter: board private structure
 670  *
 671  * Return 0 on success, negative on failure
 672  **/
 673
 674 int
 675 ixgb_setup_tx_resources(struct ixgb_adapter *adapter)
 676 {
 677         struct ixgb_desc_ring *txdr = &adapter->tx_ring;
 678         struct pci_dev *pdev = adapter->pdev;
 679         int size;
 680
 681         size = sizeof(struct ixgb_buffer) * txdr->count;
 682         txdr->buffer_info = vmalloc(size);
 683         if(!txdr->buffer_info) {
 684                 DPRINTK(PROBE, ERR,
 685                  "Unable to allocate transmit descriptor ring memory\n");
 686                 return -ENOMEM;
 687         }
 688         memset(txdr->buffer_info, 0, size);
 689
 690         /* round up to nearest 4K */
 691
 692         txdr->size = txdr->count * sizeof(struct ixgb_tx_desc);
 693         txdr->size = ALIGN(txdr->size, 4096);
 694
 695         txdr->desc = pci_alloc_consistent(pdev, txdr->size, &txdr->dma);
 696         if(!txdr->desc) {
 697                 vfree(txdr->buffer_info);
 698                 DPRINTK(PROBE, ERR,
 699                  "Unable to allocate transmit descriptor memory\n");
 700                 return -ENOMEM;
 701         }
 702         memset(txdr->desc, 0, txdr->size);
 703
 704         txdr->next_to_use = 0;
 705         txdr->next_to_clean = 0;
 706
 707         return 0;
 708 }
 709
 710 /**
 711  * ixgb_configure_tx - Configure 82597 Transmit Unit after Reset.
 712  * @adapter: board private structure
 713  *
 714  * Configure the Tx unit of the MAC after a reset.
 715  **/
 716
 717 static void
 718 ixgb_configure_tx(struct ixgb_adapter *adapter)
 719 {
 720         uint64_t tdba = adapter->tx_ring.dma;
 721         uint32_t tdlen = adapter->tx_ring.count * sizeof(struct ixgb_tx_desc);
 722         uint32_t tctl;
 723         struct ixgb_hw *hw = &adapter->hw;
 724
 725         /* Setup the Base and Length of the Tx Descriptor Ring
 726          * tx_ring.dma can be either a 32 or 64 bit value
 727          */
 728
 729         IXGB_WRITE_REG(hw, TDBAL, (tdba & 0x00000000ffffffffULL));
 730         IXGB_WRITE_REG(hw, TDBAH, (tdba >> 32));
 731
 732         IXGB_WRITE_REG(hw, TDLEN, tdlen);
 733
 734         /* Setup the HW Tx Head and Tail descriptor pointers */
 735
 736         IXGB_WRITE_REG(hw, TDH, 0);
 737         IXGB_WRITE_REG(hw, TDT, 0);
 738
 739         /* don't set up txdctl, it induces performance problems if configured
 740          * incorrectly */
 741         /* Set the Tx Interrupt Delay register */
 742
 743         IXGB_WRITE_REG(hw, TIDV, adapter->tx_int_delay);
 744
 745         /* Program the Transmit Control Register */
 746
 747         tctl = IXGB_TCTL_TCE | IXGB_TCTL_TXEN | IXGB_TCTL_TPDE;
 748         IXGB_WRITE_REG(hw, TCTL, tctl);
 749
 750         /* Setup Transmit Descriptor Settings for this adapter */
 751         adapter->tx_cmd_type =
 752                 IXGB_TX_DESC_TYPE
 753                 | (adapter->tx_int_delay_enable ? IXGB_TX_DESC_CMD_IDE : 0);
 754 }
 755
 756 /**
 757  * ixgb_setup_rx_resources - allocate Rx resources (Descriptors)
 758  * @adapter: board private structure
 759  *
 760  * Returns 0 on success, negative on failure
 761  **/
 762
 763 int
 764 ixgb_setup_rx_resources(struct ixgb_adapter *adapter)
 765 {
 766         struct ixgb_desc_ring *rxdr = &adapter->rx_ring;
 767         struct pci_dev *pdev = adapter->pdev;
 768         int size;
 769
 770         size = sizeof(struct ixgb_buffer) * rxdr->count;
 771         rxdr->buffer_info = vmalloc(size);
 772         if(!rxdr->buffer_info) {
 773                 DPRINTK(PROBE, ERR,
 774                  "Unable to allocate receive descriptor ring\n");
 775                 return -ENOMEM;
 776         }
 777         memset(rxdr->buffer_info, 0, size);
 778
 779         /* Round up to nearest 4K */
 780
 781         rxdr->size = rxdr->count * sizeof(struct ixgb_rx_desc);
 782         rxdr->size = ALIGN(rxdr->size, 4096);
 783
 784         rxdr->desc = pci_alloc_consistent(pdev, rxdr->size, &rxdr->dma);
 785
 786         if(!rxdr->desc) {
 787                 vfree(rxdr->buffer_info);
 788                 DPRINTK(PROBE, ERR,
 789                  "Unable to allocate receive descriptors\n");
 790                 return -ENOMEM;
 791         }
 792         memset(rxdr->desc, 0, rxdr->size);
 793
 794         rxdr->next_to_clean = 0;
 795         rxdr->next_to_use = 0;
 796
 797         return 0;
 798 }
 799
 800 /**
 801  * ixgb_setup_rctl - configure the receive control register
 802  * @adapter: Board private structure
 803  **/
 804
 805 static void
 806 ixgb_setup_rctl(struct ixgb_adapter *adapter)
 807 {
 808         uint32_t rctl;
 809
 810         rctl = IXGB_READ_REG(&adapter->hw, RCTL);
 811
 812         rctl &= ~(3 << IXGB_RCTL_MO_SHIFT);
 813
 814         rctl |=
 815                 IXGB_RCTL_BAM | IXGB_RCTL_RDMTS_1_2 |
 816                 IXGB_RCTL_RXEN | IXGB_RCTL_CFF |
 817                 (adapter->hw.mc_filter_type << IXGB_RCTL_MO_SHIFT);
 818
 819         rctl |= IXGB_RCTL_SECRC;
 820
 821         if (adapter->rx_buffer_len <= IXGB_RXBUFFER_2048)
 822                 rctl |= IXGB_RCTL_BSIZE_2048;
 823         else if (adapter->rx_buffer_len <= IXGB_RXBUFFER_4096)
 824                 rctl |= IXGB_RCTL_BSIZE_4096;
 825         else if (adapter->rx_buffer_len <= IXGB_RXBUFFER_8192)
 826                 rctl |= IXGB_RCTL_BSIZE_8192;
 827         else if (adapter->rx_buffer_len <= IXGB_RXBUFFER_16384)
 828                 rctl |= IXGB_RCTL_BSIZE_16384;
 829
 830         IXGB_WRITE_REG(&adapter->hw, RCTL, rctl);
 831 }
 832
 833 /**
 834  * ixgb_configure_rx - Configure 82597 Receive Unit after Reset.
 835  * @adapter: board private structure
 836  *
 837  * Configure the Rx unit of the MAC after a reset.
 838  **/
 839
 840 static void
 841 ixgb_configure_rx(struct ixgb_adapter *adapter)
 842 {
 843         uint64_t rdba = adapter->rx_ring.dma;
 844         uint32_t rdlen = adapter->rx_ring.count * sizeof(struct ixgb_rx_desc);
 845         struct ixgb_hw *hw = &adapter->hw;
 846         uint32_t rctl;
 847         uint32_t rxcsum;
 848         uint32_t rxdctl;
 849
 850         /* make sure receives are disabled while setting up the descriptors */
 851
 852         rctl = IXGB_READ_REG(hw, RCTL);
 853         IXGB_WRITE_REG(hw, RCTL, rctl & ~IXGB_RCTL_RXEN);
 854
 855         /* set the Receive Delay Timer Register */
 856
 857         IXGB_WRITE_REG(hw, RDTR, adapter->rx_int_delay);
 858
 859         /* Setup the Base and Length of the Rx Descriptor Ring */
 860
 861         IXGB_WRITE_REG(hw, RDBAL, (rdba & 0x00000000ffffffffULL));
 862         IXGB_WRITE_REG(hw, RDBAH, (rdba >> 32));
 863
 864         IXGB_WRITE_REG(hw, RDLEN, rdlen);
 865
 866         /* Setup the HW Rx Head and Tail Descriptor Pointers */
 867         IXGB_WRITE_REG(hw, RDH, 0);
 868         IXGB_WRITE_REG(hw, RDT, 0);
 869
 870         /* set up pre-fetching of receive buffers so we get some before we
 871          * run out (default hardware behavior is to run out before fetching
 872          * more).  This sets up to fetch if HTHRESH rx descriptors are avail
 873          * and the descriptors in hw cache are below PTHRESH.  This avoids
 874          * the hardware behavior of fetching <=512 descriptors in a single
 875          * burst that pre-empts all other activity, usually causing fifo
 876          * overflows. */
 877         /* use WTHRESH to burst write 16 descriptors or burst when RXT0 */
 878         rxdctl = RXDCTL_WTHRESH_DEFAULT << IXGB_RXDCTL_WTHRESH_SHIFT |
 879                  RXDCTL_HTHRESH_DEFAULT << IXGB_RXDCTL_HTHRESH_SHIFT |
 880                  RXDCTL_PTHRESH_DEFAULT << IXGB_RXDCTL_PTHRESH_SHIFT;
 881         IXGB_WRITE_REG(hw, RXDCTL, rxdctl);
 882
 883         /* Enable Receive Checksum Offload for TCP and UDP */
 884         if(adapter->rx_csum == TRUE) {
 885                 rxcsum = IXGB_READ_REG(hw, RXCSUM);
 886                 rxcsum |= IXGB_RXCSUM_TUOFL;
 887                 IXGB_WRITE_REG(hw, RXCSUM, rxcsum);
 888         }
 889
 890         /* Enable Receives */
 891
 892         IXGB_WRITE_REG(hw, RCTL, rctl);
 893 }
 894
 895 /**
 896  * ixgb_free_tx_resources - Free Tx Resources
 897  * @adapter: board private structure
 898  *
 899  * Free all transmit software resources
 900  **/
 901
 902 void
 903 ixgb_free_tx_resources(struct ixgb_adapter *adapter)
 904 {
 905         struct pci_dev *pdev = adapter->pdev;
 906
 907         ixgb_clean_tx_ring(adapter);
 908
 909         vfree(adapter->tx_ring.buffer_info);
 910         adapter->tx_ring.buffer_info = NULL;
 911
 912         pci_free_consistent(pdev, adapter->tx_ring.size,
 913                             adapter->tx_ring.desc, adapter->tx_ring.dma);
 914
 915         adapter->tx_ring.desc = NULL;
 916 }
 917
 918 static void
 919 ixgb_unmap_and_free_tx_resource(struct ixgb_adapter *adapter,
 920                                         struct ixgb_buffer *buffer_info)
 921 {
 922         struct pci_dev *pdev = adapter->pdev;
 923
 924         if (buffer_info->dma)
 925                 pci_unmap_page(pdev, buffer_info->dma, buffer_info->length,
 926                                PCI_DMA_TODEVICE);
 927
 928         if (buffer_info->skb)
 929                 dev_kfree_skb_any(buffer_info->skb);
 930
 931         buffer_info->skb = NULL;
 932         buffer_info->dma = 0;
 933         buffer_info->time_stamp = 0;
 934         /* these fields must always be initialized in tx
 935          * buffer_info->length = 0;
 936          * buffer_info->next_to_watch = 0; */
 937 }
 938
 939 /**
 940  * ixgb_clean_tx_ring - Free Tx Buffers
 941  * @adapter: board private structure
 942  **/
 943
 944 static void
 945 ixgb_clean_tx_ring(struct ixgb_adapter *adapter)
 946 {
 947         struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
 948         struct ixgb_buffer *buffer_info;
 949         unsigned long size;
 950         unsigned int i;
 951
 952         /* Free all the Tx ring sk_buffs */
 953
 954         for(i = 0; i < tx_ring->count; i++) {
 955                 buffer_info = &tx_ring->buffer_info[i];
 956                 ixgb_unmap_and_free_tx_resource(adapter, buffer_info);
 957         }
 958
 959         size = sizeof(struct ixgb_buffer) * tx_ring->count;
 960         memset(tx_ring->buffer_info, 0, size);
 961
 962         /* Zero out the descriptor ring */
 963
 964         memset(tx_ring->desc, 0, tx_ring->size);
 965
 966         tx_ring->next_to_use = 0;
 967         tx_ring->next_to_clean = 0;
 968
 969         IXGB_WRITE_REG(&adapter->hw, TDH, 0);
 970         IXGB_WRITE_REG(&adapter->hw, TDT, 0);
 971 }
 972
 973 /**
 974  * ixgb_free_rx_resources - Free Rx Resources
 975  * @adapter: board private structure
 976  *
 977  * Free all receive software resources
 978  **/
 979
 980 void
 981 ixgb_free_rx_resources(struct ixgb_adapter *adapter)
 982 {
 983         struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
 984         struct pci_dev *pdev = adapter->pdev;
 985
 986         ixgb_clean_rx_ring(adapter);
 987
 988         vfree(rx_ring->buffer_info);
 989         rx_ring->buffer_info = NULL;
 990
 991         pci_free_consistent(pdev, rx_ring->size, rx_ring->desc, rx_ring->dma);
 992
 993         rx_ring->desc = NULL;
 994 }
 995
 996 /**
 997  * ixgb_clean_rx_ring - Free Rx Buffers
 998  * @adapter: board private structure
 999  **/
1000
1001 static void
1002 ixgb_clean_rx_ring(struct ixgb_adapter *adapter)
1003 {
1004         struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
1005         struct ixgb_buffer *buffer_info;
1006         struct pci_dev *pdev = adapter->pdev;
1007         unsigned long size;
1008         unsigned int i;
1009
1010         /* Free all the Rx ring sk_buffs */
1011
1012         for(i = 0; i < rx_ring->count; i++) {
1013                 buffer_info = &rx_ring->buffer_info[i];
1014                 if(buffer_info->skb) {
1015
1016                         pci_unmap_single(pdev,
1017                                          buffer_info->dma,
1018                                          buffer_info->length,
1019                                          PCI_DMA_FROMDEVICE);
1020
1021                         dev_kfree_skb(buffer_info->skb);
1022
1023                         buffer_info->skb = NULL;
1024                 }
1025         }
1026
1027         size = sizeof(struct ixgb_buffer) * rx_ring->count;
1028         memset(rx_ring->buffer_info, 0, size);
1029
1030         /* Zero out the descriptor ring */
1031
1032         memset(rx_ring->desc, 0, rx_ring->size);
1033
1034         rx_ring->next_to_clean = 0;
1035         rx_ring->next_to_use = 0;
1036
1037         IXGB_WRITE_REG(&adapter->hw, RDH, 0);
1038         IXGB_WRITE_REG(&adapter->hw, RDT, 0);
1039 }
1040
1041 /**
1042  * ixgb_set_mac - Change the Ethernet Address of the NIC
1043  * @netdev: network interface device structure
1044  * @p: pointer to an address structure
1045  *
1046  * Returns 0 on success, negative on failure
1047  **/
1048
1049 static int
1050 ixgb_set_mac(struct net_device *netdev, void *p)
1051 {
1052         struct ixgb_adapter *adapter = netdev_priv(netdev);
1053         struct sockaddr *addr = p;
1054
1055         if(!is_valid_ether_addr(addr->sa_data))
1056                 return -EADDRNOTAVAIL;
1057
1058         memcpy(netdev->dev_addr, addr->sa_data, netdev->addr_len);
1059
1060         ixgb_rar_set(&adapter->hw, addr->sa_data, 0);
1061
1062         return 0;
1063 }
1064
1065 /**
1066  * ixgb_set_multi - Multicast and Promiscuous mode set
1067  * @netdev: network interface device structure
1068  *
1069  * The set_multi entry point is called whenever the multicast address
1070  * list or the network interface flags are updated.  This routine is
1071  * responsible for configuring the hardware for proper multicast,
1072  * promiscuous mode, and all-multi behavior.
1073  **/
1074
1075 static void
1076 ixgb_set_multi(struct net_device *netdev)
1077 {
1078         struct ixgb_adapter *adapter = netdev_priv(netdev);
1079         struct ixgb_hw *hw = &adapter->hw;
1080         struct dev_mc_list *mc_ptr;
1081         uint32_t rctl;
1082         int i;
1083
1084         /* Check for Promiscuous and All Multicast modes */
1085
1086         rctl = IXGB_READ_REG(hw, RCTL);
1087
1088         if(netdev->flags & IFF_PROMISC) {
1089                 rctl |= (IXGB_RCTL_UPE | IXGB_RCTL_MPE);
1090         } else if(netdev->flags & IFF_ALLMULTI) {
1091                 rctl |= IXGB_RCTL_MPE;
1092                 rctl &= ~IXGB_RCTL_UPE;
1093         } else {
1094                 rctl &= ~(IXGB_RCTL_UPE | IXGB_RCTL_MPE);
1095         }
1096
1097         if(netdev->mc_count > IXGB_MAX_NUM_MULTICAST_ADDRESSES) {
1098                 rctl |= IXGB_RCTL_MPE;
1099                 IXGB_WRITE_REG(hw, RCTL, rctl);
1100         } else {
1101                 uint8_t mta[IXGB_MAX_NUM_MULTICAST_ADDRESSES *
1102                             IXGB_ETH_LENGTH_OF_ADDRESS];
1103
1104                 IXGB_WRITE_REG(hw, RCTL, rctl);
1105
1106                 for(i = 0, mc_ptr = netdev->mc_list; mc_ptr;
1107                         i++, mc_ptr = mc_ptr->next)
1108                         memcpy(&mta[i * IXGB_ETH_LENGTH_OF_ADDRESS],
1109                                    mc_ptr->dmi_addr, IXGB_ETH_LENGTH_OF_ADDRESS);
1110
1111                 ixgb_mc_addr_list_update(hw, mta, netdev->mc_count, 0);
1112         }
1113 }
1114
1115 /**
1116  * ixgb_watchdog - Timer Call-back
1117  * @data: pointer to netdev cast into an unsigned long
1118  **/
1119
1120 static void
1121 ixgb_watchdog(unsigned long data)
1122 {
1123         struct ixgb_adapter *adapter = (struct ixgb_adapter *)data;
1124         struct net_device *netdev = adapter->netdev;
1125         struct ixgb_desc_ring *txdr = &adapter->tx_ring;
1126
1127         ixgb_check_for_link(&adapter->hw);
1128
1129         if (ixgb_check_for_bad_link(&adapter->hw)) {
1130                 /* force the reset path */
1131                 netif_stop_queue(netdev);
1132         }
1133
1134         if(adapter->hw.link_up) {
1135                 if(!netif_carrier_ok(netdev)) {
1136                         DPRINTK(LINK, INFO,
1137                                 "NIC Link is Up 10000 Mbps Full Duplex\n");
1138                         adapter->link_speed = 10000;
1139                         adapter->link_duplex = FULL_DUPLEX;
1140                         netif_carrier_on(netdev);
1141                         netif_wake_queue(netdev);
1142                 }
1143         } else {
1144                 if(netif_carrier_ok(netdev)) {
1145                         adapter->link_speed = 0;
1146                         adapter->link_duplex = 0;
1147                         DPRINTK(LINK, INFO, "NIC Link is Down\n");
1148                         netif_carrier_off(netdev);
1149                         netif_stop_queue(netdev);
1150
1151                 }
1152         }
1153
1154         ixgb_update_stats(adapter);
1155
1156         if(!netif_carrier_ok(netdev)) {
1157                 if(IXGB_DESC_UNUSED(txdr) + 1 < txdr->count) {
1158                         /* We've lost link, so the controller stops DMA,
1159                          * but we've got queued Tx work that's never going
1160                          * to get done, so reset controller to flush Tx.
1161                          * (Do the reset outside of interrupt context). */
1162                         schedule_work(&adapter->tx_timeout_task);
1163                 }
1164         }
1165
1166         /* Force detection of hung controller every watchdog period */
1167         adapter->detect_tx_hung = TRUE;
1168
1169         /* generate an interrupt to force clean up of any stragglers */
1170         IXGB_WRITE_REG(&adapter->hw, ICS, IXGB_INT_TXDW);
1171
1172         /* Reset the timer */
1173         mod_timer(&adapter->watchdog_timer, jiffies + 2 * HZ);
1174 }
1175
1176 #define IXGB_TX_FLAGS_CSUM              0x00000001
1177 #define IXGB_TX_FLAGS_VLAN              0x00000002
1178 #define IXGB_TX_FLAGS_TSO               0x00000004
1179
1180 static int
1181 ixgb_tso(struct ixgb_adapter *adapter, struct sk_buff *skb)
1182 {
1183         struct ixgb_context_desc *context_desc;
1184         unsigned int i;
1185         uint8_t ipcss, ipcso, tucss, tucso, hdr_len;
1186         uint16_t ipcse, tucse, mss;
1187         int err;
1188
1189         if (likely(skb_is_gso(skb))) {
1190                 struct ixgb_buffer *buffer_info;
1191                 struct iphdr *iph;
1192
1193                 if (skb_header_cloned(skb)) {
1194                         err = pskb_expand_head(skb, 0, 0, GFP_ATOMIC);
1195                         if (err)
1196                                 return err;
1197                 }
1198
1199                 hdr_len = skb_transport_offset(skb) + tcp_hdrlen(skb);
1200                 mss = skb_shinfo(skb)->gso_size;
1201                 iph = ip_hdr(skb);
1202                 iph->tot_len = 0;
1203                 iph->check = 0;
1204                 tcp_hdr(skb)->check = ~csum_tcpudp_magic(iph->saddr,
1205                                                          iph->daddr, 0,
1206                                                          IPPROTO_TCP, 0);
1207                 ipcss = skb_network_offset(skb);
1208                 ipcso = (void *)&(iph->check) - (void *)skb->data;
1209                 ipcse = skb_transport_offset(skb) - 1;
1210                 tucss = skb_transport_offset(skb);
1211                 tucso = (void *)&(tcp_hdr(skb)->check) - (void *)skb->data;
1212                 tucse = 0;
1213
1214                 i = adapter->tx_ring.next_to_use;
1215                 context_desc = IXGB_CONTEXT_DESC(adapter->tx_ring, i);
1216                 buffer_info = &adapter->tx_ring.buffer_info[i];
1217                 WARN_ON(buffer_info->dma != 0);
1218
1219                 context_desc->ipcss = ipcss;
1220                 context_desc->ipcso = ipcso;
1221                 context_desc->ipcse = cpu_to_le16(ipcse);
1222                 context_desc->tucss = tucss;
1223                 context_desc->tucso = tucso;
1224                 context_desc->tucse = cpu_to_le16(tucse);
1225                 context_desc->mss = cpu_to_le16(mss);
1226                 context_desc->hdr_len = hdr_len;
1227                 context_desc->status = 0;
1228                 context_desc->cmd_type_len = cpu_to_le32(
1229                                                   IXGB_CONTEXT_DESC_TYPE
1230                                                 | IXGB_CONTEXT_DESC_CMD_TSE
1231                                                 | IXGB_CONTEXT_DESC_CMD_IP
1232                                                 | IXGB_CONTEXT_DESC_CMD_TCP
1233                                                 | IXGB_CONTEXT_DESC_CMD_IDE
1234                                                 | (skb->len - (hdr_len)));
1235
1236
1237                 if(++i == adapter->tx_ring.count) i = 0;
1238                 adapter->tx_ring.next_to_use = i;
1239
1240                 return 1;
1241         }
1242
1243         return 0;
1244 }
1245
1246 static boolean_t
1247 ixgb_tx_csum(struct ixgb_adapter *adapter, struct sk_buff *skb)
1248 {
1249         struct ixgb_context_desc *context_desc;
1250         unsigned int i;
1251         uint8_t css, cso;
1252
1253         if(likely(skb->ip_summed == CHECKSUM_PARTIAL)) {
1254                 struct ixgb_buffer *buffer_info;
1255                 css = skb_transport_offset(skb);
1256                 cso = css + skb->csum_offset;
1257
1258                 i = adapter->tx_ring.next_to_use;
1259                 context_desc = IXGB_CONTEXT_DESC(adapter->tx_ring, i);
1260                 buffer_info = &adapter->tx_ring.buffer_info[i];
1261                 WARN_ON(buffer_info->dma != 0);
1262
1263                 context_desc->tucss = css;
1264                 context_desc->tucso = cso;
1265                 context_desc->tucse = 0;
1266                 /* zero out any previously existing data in one instruction */
1267                 *(uint32_t *)&(context_desc->ipcss) = 0;
1268                 context_desc->status = 0;
1269                 context_desc->hdr_len = 0;
1270                 context_desc->mss = 0;
1271                 context_desc->cmd_type_len =
1272                         cpu_to_le32(IXGB_CONTEXT_DESC_TYPE
1273                                     | IXGB_TX_DESC_CMD_IDE);
1274
1275                 if(++i == adapter->tx_ring.count) i = 0;
1276                 adapter->tx_ring.next_to_use = i;
1277
1278                 return TRUE;
1279         }
1280
1281         return FALSE;
1282 }
1283
1284 #define IXGB_MAX_TXD_PWR        14
1285 #define IXGB_MAX_DATA_PER_TXD   (1<<IXGB_MAX_TXD_PWR)
1286
1287 static int
1288 ixgb_tx_map(struct ixgb_adapter *adapter, struct sk_buff *skb,
1289             unsigned int first)
1290 {
1291         struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
1292         struct ixgb_buffer *buffer_info;
1293         int len = skb->len;
1294         unsigned int offset = 0, size, count = 0, i;
1295         unsigned int mss = skb_shinfo(skb)->gso_size;
1296
1297         unsigned int nr_frags = skb_shinfo(skb)->nr_frags;
1298         unsigned int f;
1299
1300         len -= skb->data_len;
1301
1302         i = tx_ring->next_to_use;
1303
1304         while(len) {
1305                 buffer_info = &tx_ring->buffer_info[i];
1306                 size = min(len, IXGB_MAX_DATA_PER_TXD);
1307                 /* Workaround for premature desc write-backs
1308                  * in TSO mode.  Append 4-byte sentinel desc */
1309                 if (unlikely(mss && !nr_frags && size == len && size > 8))
1310                         size -= 4;
1311
1312                 buffer_info->length = size;
1313                 WARN_ON(buffer_info->dma != 0);
1314                 buffer_info->dma =
1315                         pci_map_single(adapter->pdev,
1316                                 skb->data + offset,
1317                                 size,
1318                                 PCI_DMA_TODEVICE);
1319                 buffer_info->time_stamp = jiffies;
1320                 buffer_info->next_to_watch = 0;
1321
1322                 len -= size;
1323                 offset += size;
1324                 count++;
1325                 if(++i == tx_ring->count) i = 0;
1326         }
1327
1328         for(f = 0; f < nr_frags; f++) {
1329                 struct skb_frag_struct *frag;
1330
1331                 frag = &skb_shinfo(skb)->frags[f];
1332                 len = frag->size;
1333                 offset = 0;
1334
1335                 while(len) {
1336                         buffer_info = &tx_ring->buffer_info[i];
1337                         size = min(len, IXGB_MAX_DATA_PER_TXD);
1338
1339                         /* Workaround for premature desc write-backs
1340                          * in TSO mode.  Append 4-byte sentinel desc */
1341                         if (unlikely(mss && (f == (nr_frags - 1))
1342                                      && size == len && size > 8))
1343                                 size -= 4;
1344
1345                         buffer_info->length = size;
1346                         buffer_info->dma =
1347                                 pci_map_page(adapter->pdev,
1348                                         frag->page,
1349                                         frag->page_offset + offset,
1350                                         size,
1351                                         PCI_DMA_TODEVICE);
1352                         buffer_info->time_stamp = jiffies;
1353                         buffer_info->next_to_watch = 0;
1354
1355                         len -= size;
1356                         offset += size;
1357                         count++;
1358                         if(++i == tx_ring->count) i = 0;
1359                 }
1360         }
1361         i = (i == 0) ? tx_ring->count - 1 : i - 1;
1362         tx_ring->buffer_info[i].skb = skb;
1363         tx_ring->buffer_info[first].next_to_watch = i;
1364
1365         return count;
1366 }
1367
1368 static void
1369 ixgb_tx_queue(struct ixgb_adapter *adapter, int count, int vlan_id,int tx_flags)
1370 {
1371         struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
1372         struct ixgb_tx_desc *tx_desc = NULL;
1373         struct ixgb_buffer *buffer_info;
1374         uint32_t cmd_type_len = adapter->tx_cmd_type;
1375         uint8_t status = 0;
1376         uint8_t popts = 0;
1377         unsigned int i;
1378
1379         if(tx_flags & IXGB_TX_FLAGS_TSO) {
1380                 cmd_type_len |= IXGB_TX_DESC_CMD_TSE;
1381                 popts |= (IXGB_TX_DESC_POPTS_IXSM | IXGB_TX_DESC_POPTS_TXSM);
1382         }
1383
1384         if(tx_flags & IXGB_TX_FLAGS_CSUM)
1385                 popts |= IXGB_TX_DESC_POPTS_TXSM;
1386
1387         if(tx_flags & IXGB_TX_FLAGS_VLAN) {
1388                 cmd_type_len |= IXGB_TX_DESC_CMD_VLE;
1389         }
1390
1391         i = tx_ring->next_to_use;
1392
1393         while(count--) {
1394                 buffer_info = &tx_ring->buffer_info[i];
1395                 tx_desc = IXGB_TX_DESC(*tx_ring, i);
1396                 tx_desc->buff_addr = cpu_to_le64(buffer_info->dma);
1397                 tx_desc->cmd_type_len =
1398                         cpu_to_le32(cmd_type_len | buffer_info->length);
1399                 tx_desc->status = status;
1400                 tx_desc->popts = popts;
1401                 tx_desc->vlan = cpu_to_le16(vlan_id);
1402
1403                 if(++i == tx_ring->count) i = 0;
1404         }
1405
1406         tx_desc->cmd_type_len |= cpu_to_le32(IXGB_TX_DESC_CMD_EOP
1407                                 | IXGB_TX_DESC_CMD_RS );
1408
1409         /* Force memory writes to complete before letting h/w
1410          * know there are new descriptors to fetch.  (Only
1411          * applicable for weak-ordered memory model archs,
1412          * such as IA-64). */
1413         wmb();
1414
1415         tx_ring->next_to_use = i;
1416         IXGB_WRITE_REG(&adapter->hw, TDT, i);
1417 }
1418
1419 static int __ixgb_maybe_stop_tx(struct net_device *netdev, int size)
1420 {
1421         struct ixgb_adapter *adapter = netdev_priv(netdev);
1422         struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
1423
1424         netif_stop_queue(netdev);
1425         /* Herbert's original patch had:
1426          *  smp_mb__after_netif_stop_queue();
1427          * but since that doesn't exist yet, just open code it. */
1428         smp_mb();
1429
1430         /* We need to check again in a case another CPU has just
1431          * made room available. */
1432         if (likely(IXGB_DESC_UNUSED(tx_ring) < size))
1433                 return -EBUSY;
1434
1435         /* A reprieve! */
1436         netif_start_queue(netdev);
1437         ++adapter->restart_queue;
1438         return 0;
1439 }
1440
1441 static int ixgb_maybe_stop_tx(struct net_device *netdev,
1442                               struct ixgb_desc_ring *tx_ring, int size)
1443 {
1444         if (likely(IXGB_DESC_UNUSED(tx_ring) >= size))
1445                 return 0;
1446         return __ixgb_maybe_stop_tx(netdev, size);
1447 }
1448
1449
1450 /* Tx Descriptors needed, worst case */
1451 #define TXD_USE_COUNT(S) (((S) >> IXGB_MAX_TXD_PWR) + \
1452                          (((S) & (IXGB_MAX_DATA_PER_TXD - 1)) ? 1 : 0))
1453 #define DESC_NEEDED TXD_USE_COUNT(IXGB_MAX_DATA_PER_TXD) /* skb->date */ + \
1454         MAX_SKB_FRAGS * TXD_USE_COUNT(PAGE_SIZE) + 1 /* for context */ \
1455         + 1 /* one more needed for sentinel TSO workaround */
1456
1457 static int
1458 ixgb_xmit_frame(struct sk_buff *skb, struct net_device *netdev)
1459 {
1460         struct ixgb_adapter *adapter = netdev_priv(netdev);
1461         unsigned int first;
1462         unsigned int tx_flags = 0;
1463         unsigned long flags;
1464         int vlan_id = 0;
1465         int tso;
1466
1467         if(skb->len <= 0) {
1468                 dev_kfree_skb_any(skb);
1469                 return 0;
1470         }
1471
1472 #ifdef NETIF_F_LLTX
1473         local_irq_save(flags);
1474         if (!spin_trylock(&adapter->tx_lock)) {
1475                 /* Collision - tell upper layer to requeue */
1476                 local_irq_restore(flags);
1477                 return NETDEV_TX_LOCKED;
1478         }
1479 #else
1480         spin_lock_irqsave(&adapter->tx_lock, flags);
1481 #endif
1482
1483         if (unlikely(ixgb_maybe_stop_tx(netdev, &adapter->tx_ring,
1484                      DESC_NEEDED))) {
1485                 netif_stop_queue(netdev);
1486                 spin_unlock_irqrestore(&adapter->tx_lock, flags);
1487                 return NETDEV_TX_BUSY;
1488         }
1489
1490 #ifndef NETIF_F_LLTX
1491         spin_unlock_irqrestore(&adapter->tx_lock, flags);
1492 #endif
1493
1494         if(adapter->vlgrp && vlan_tx_tag_present(skb)) {
1495                 tx_flags |= IXGB_TX_FLAGS_VLAN;
1496                 vlan_id = vlan_tx_tag_get(skb);
1497         }
1498
1499         first = adapter->tx_ring.next_to_use;
1500
1501         tso = ixgb_tso(adapter, skb);
1502         if (tso < 0) {
1503                 dev_kfree_skb_any(skb);
1504 #ifdef NETIF_F_LLTX
1505                 spin_unlock_irqrestore(&adapter->tx_lock, flags);
1506 #endif
1507                 return NETDEV_TX_OK;
1508         }
1509
1510         if (likely(tso))
1511                 tx_flags |= IXGB_TX_FLAGS_TSO;
1512         else if(ixgb_tx_csum(adapter, skb))
1513                 tx_flags |= IXGB_TX_FLAGS_CSUM;
1514
1515         ixgb_tx_queue(adapter, ixgb_tx_map(adapter, skb, first), vlan_id,
1516                         tx_flags);
1517
1518         netdev->trans_start = jiffies;
1519
1520 #ifdef NETIF_F_LLTX
1521         /* Make sure there is space in the ring for the next send. */
1522         ixgb_maybe_stop_tx(netdev, &adapter->tx_ring, DESC_NEEDED);
1523
1524         spin_unlock_irqrestore(&adapter->tx_lock, flags);
1525
1526 #endif
1527         return NETDEV_TX_OK;
1528 }
1529
1530 /**
1531  * ixgb_tx_timeout - Respond to a Tx Hang
1532  * @netdev: network interface device structure
1533  **/
1534
1535 static void
1536 ixgb_tx_timeout(struct net_device *netdev)
1537 {
1538         struct ixgb_adapter *adapter = netdev_priv(netdev);
1539
1540         /* Do the reset outside of interrupt context */
1541         schedule_work(&adapter->tx_timeout_task);
1542 }
1543
1544 static void
1545 ixgb_tx_timeout_task(struct work_struct *work)
1546 {
1547         struct ixgb_adapter *adapter =
1548                 container_of(work, struct ixgb_adapter, tx_timeout_task);
1549
1550         adapter->tx_timeout_count++;
1551         ixgb_down(adapter, TRUE);
1552         ixgb_up(adapter);
1553 }
1554
1555 /**
1556  * ixgb_get_stats - Get System Network Statistics
1557  * @netdev: network interface device structure
1558  *
1559  * Returns the address of the device statistics structure.
1560  * The statistics are actually updated from the timer callback.
1561  **/
1562
1563 static struct net_device_stats *
1564 ixgb_get_stats(struct net_device *netdev)
1565 {
1566         struct ixgb_adapter *adapter = netdev_priv(netdev);
1567
1568         return &adapter->net_stats;
1569 }
1570
1571 /**
1572  * ixgb_change_mtu - Change the Maximum Transfer Unit
1573  * @netdev: network interface device structure
1574  * @new_mtu: new value for maximum frame size
1575  *
1576  * Returns 0 on success, negative on failure
1577  **/
1578
1579 static int
1580 ixgb_change_mtu(struct net_device *netdev, int new_mtu)
1581 {
1582         struct ixgb_adapter *adapter = netdev_priv(netdev);
1583         int max_frame = new_mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;
1584         int old_max_frame = netdev->mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;
1585
1586
1587         if((max_frame < IXGB_MIN_ENET_FRAME_SIZE_WITHOUT_FCS + ENET_FCS_LENGTH)
1588            || (max_frame > IXGB_MAX_JUMBO_FRAME_SIZE + ENET_FCS_LENGTH)) {
1589                 DPRINTK(PROBE, ERR, "Invalid MTU setting %d\n", new_mtu);
1590                 return -EINVAL;
1591         }
1592
1593         adapter->rx_buffer_len = max_frame;
1594
1595         netdev->mtu = new_mtu;
1596
1597         if ((old_max_frame != max_frame) && netif_running(netdev)) {
1598                 ixgb_down(adapter, TRUE);
1599                 ixgb_up(adapter);
1600         }
1601
1602         return 0;
1603 }
1604
1605 /**
1606  * ixgb_update_stats - Update the board statistics counters.
1607  * @adapter: board private structure
1608  **/
1609
1610 void
1611 ixgb_update_stats(struct ixgb_adapter *adapter)
1612 {
1613         struct net_device *netdev = adapter->netdev;
1614         struct pci_dev *pdev = adapter->pdev;
1615
1616         /* Prevent stats update while adapter is being reset */
1617         if (pci_channel_offline(pdev))
1618                 return;
1619
1620         if((netdev->flags & IFF_PROMISC) || (netdev->flags & IFF_ALLMULTI) ||
1621            (netdev->mc_count > IXGB_MAX_NUM_MULTICAST_ADDRESSES)) {
1622                 u64 multi = IXGB_READ_REG(&adapter->hw, MPRCL);
1623                 u32 bcast_l = IXGB_READ_REG(&adapter->hw, BPRCL);
1624                 u32 bcast_h = IXGB_READ_REG(&adapter->hw, BPRCH);
1625                 u64 bcast = ((u64)bcast_h << 32) | bcast_l;
1626
1627                 multi |= ((u64)IXGB_READ_REG(&adapter->hw, MPRCH) << 32);
1628                 /* fix up multicast stats by removing broadcasts */
1629                 if(multi >= bcast)
1630                         multi -= bcast;
1631
1632                 adapter->stats.mprcl += (multi & 0xFFFFFFFF);
1633                 adapter->stats.mprch += (multi >> 32);
1634                 adapter->stats.bprcl += bcast_l;
1635                 adapter->stats.bprch += bcast_h;
1636         } else {
1637                 adapter->stats.mprcl += IXGB_READ_REG(&adapter->hw, MPRCL);
1638                 adapter->stats.mprch += IXGB_READ_REG(&adapter->hw, MPRCH);
1639                 adapter->stats.bprcl += IXGB_READ_REG(&adapter->hw, BPRCL);
1640                 adapter->stats.bprch += IXGB_READ_REG(&adapter->hw, BPRCH);
1641         }
1642         adapter->stats.tprl += IXGB_READ_REG(&adapter->hw, TPRL);
1643         adapter->stats.tprh += IXGB_READ_REG(&adapter->hw, TPRH);
1644         adapter->stats.gprcl += IXGB_READ_REG(&adapter->hw, GPRCL);
1645         adapter->stats.gprch += IXGB_READ_REG(&adapter->hw, GPRCH);
1646         adapter->stats.uprcl += IXGB_READ_REG(&adapter->hw, UPRCL);
1647         adapter->stats.uprch += IXGB_READ_REG(&adapter->hw, UPRCH);
1648         adapter->stats.vprcl += IXGB_READ_REG(&adapter->hw, VPRCL);
1649         adapter->stats.vprch += IXGB_READ_REG(&adapter->hw, VPRCH);
1650         adapter->stats.jprcl += IXGB_READ_REG(&adapter->hw, JPRCL);
1651         adapter->stats.jprch += IXGB_READ_REG(&adapter->hw, JPRCH);
1652         adapter->stats.gorcl += IXGB_READ_REG(&adapter->hw, GORCL);
1653         adapter->stats.gorch += IXGB_READ_REG(&adapter->hw, GORCH);
1654         adapter->stats.torl += IXGB_READ_REG(&adapter->hw, TORL);
1655         adapter->stats.torh += IXGB_READ_REG(&adapter->hw, TORH);
1656         adapter->stats.rnbc += IXGB_READ_REG(&adapter->hw, RNBC);
1657         adapter->stats.ruc += IXGB_READ_REG(&adapter->hw, RUC);
1658         adapter->stats.roc += IXGB_READ_REG(&adapter->hw, ROC);
1659         adapter->stats.rlec += IXGB_READ_REG(&adapter->hw, RLEC);
1660         adapter->stats.crcerrs += IXGB_READ_REG(&adapter->hw, CRCERRS);
1661         adapter->stats.icbc += IXGB_READ_REG(&adapter->hw, ICBC);
1662         adapter->stats.ecbc += IXGB_READ_REG(&adapter->hw, ECBC);
1663         adapter->stats.mpc += IXGB_READ_REG(&adapter->hw, MPC);
1664         adapter->stats.tptl += IXGB_READ_REG(&adapter->hw, TPTL);
1665         adapter->stats.tpth += IXGB_READ_REG(&adapter->hw, TPTH);
1666         adapter->stats.gptcl += IXGB_READ_REG(&adapter->hw, GPTCL);
1667         adapter->stats.gptch += IXGB_READ_REG(&adapter->hw, GPTCH);
1668         adapter->stats.bptcl += IXGB_READ_REG(&adapter->hw, BPTCL);
1669         adapter->stats.bptch += IXGB_READ_REG(&adapter->hw, BPTCH);
1670         adapter->stats.mptcl += IXGB_READ_REG(&adapter->hw, MPTCL);
1671         adapter->stats.mptch += IXGB_READ_REG(&adapter->hw, MPTCH);
1672         adapter->stats.uptcl += IXGB_READ_REG(&adapter->hw, UPTCL);
1673         adapter->stats.uptch += IXGB_READ_REG(&adapter->hw, UPTCH);
1674         adapter->stats.vptcl += IXGB_READ_REG(&adapter->hw, VPTCL);
1675         adapter->stats.vptch += IXGB_READ_REG(&adapter->hw, VPTCH);
1676         adapter->stats.jptcl += IXGB_READ_REG(&adapter->hw, JPTCL);
1677         adapter->stats.jptch += IXGB_READ_REG(&adapter->hw, JPTCH);
1678         adapter->stats.gotcl += IXGB_READ_REG(&adapter->hw, GOTCL);
1679         adapter->stats.gotch += IXGB_READ_REG(&adapter->hw, GOTCH);
1680         adapter->stats.totl += IXGB_READ_REG(&adapter->hw, TOTL);
1681         adapter->stats.toth += IXGB_READ_REG(&adapter->hw, TOTH);
1682         adapter->stats.dc += IXGB_READ_REG(&adapter->hw, DC);
1683         adapter->stats.plt64c += IXGB_READ_REG(&adapter->hw, PLT64C);
1684         adapter->stats.tsctc += IXGB_READ_REG(&adapter->hw, TSCTC);
1685         adapter->stats.tsctfc += IXGB_READ_REG(&adapter->hw, TSCTFC);
1686         adapter->stats.ibic += IXGB_READ_REG(&adapter->hw, IBIC);
1687         adapter->stats.rfc += IXGB_READ_REG(&adapter->hw, RFC);
1688         adapter->stats.lfc += IXGB_READ_REG(&adapter->hw, LFC);
1689         adapter->stats.pfrc += IXGB_READ_REG(&adapter->hw, PFRC);
1690         adapter->stats.pftc += IXGB_READ_REG(&adapter->hw, PFTC);
1691         adapter->stats.mcfrc += IXGB_READ_REG(&adapter->hw, MCFRC);
1692         adapter->stats.mcftc += IXGB_READ_REG(&adapter->hw, MCFTC);
1693         adapter->stats.xonrxc += IXGB_READ_REG(&adapter->hw, XONRXC);
1694         adapter->stats.xontxc += IXGB_READ_REG(&adapter->hw, XONTXC);
1695         adapter->stats.xoffrxc += IXGB_READ_REG(&adapter->hw, XOFFRXC);
1696         adapter->stats.xofftxc += IXGB_READ_REG(&adapter->hw, XOFFTXC);
1697         adapter->stats.rjc += IXGB_READ_REG(&adapter->hw, RJC);
1698
1699         /* Fill out the OS statistics structure */
1700
1701         adapter->net_stats.rx_packets = adapter->stats.gprcl;
1702         adapter->net_stats.tx_packets = adapter->stats.gptcl;
1703         adapter->net_stats.rx_bytes = adapter->stats.gorcl;
1704         adapter->net_stats.tx_bytes = adapter->stats.gotcl;
1705         adapter->net_stats.multicast = adapter->stats.mprcl;
1706         adapter->net_stats.collisions = 0;
1707
1708         /* ignore RLEC as it reports errors for padded (<64bytes) frames
1709          * with a length in the type/len field */
1710         adapter->net_stats.rx_errors =
1711             /* adapter->stats.rnbc + */ adapter->stats.crcerrs +
1712             adapter->stats.ruc +
1713             adapter->stats.roc /*+ adapter->stats.rlec */  +
1714             adapter->stats.icbc +
1715             adapter->stats.ecbc + adapter->stats.mpc;
1716
1717         /* see above
1718          * adapter->net_stats.rx_length_errors = adapter->stats.rlec;
1719          */
1720
1721         adapter->net_stats.rx_crc_errors = adapter->stats.crcerrs;
1722         adapter->net_stats.rx_fifo_errors = adapter->stats.mpc;
1723         adapter->net_stats.rx_missed_errors = adapter->stats.mpc;
1724         adapter->net_stats.rx_over_errors = adapter->stats.mpc;
1725
1726         adapter->net_stats.tx_errors = 0;
1727         adapter->net_stats.rx_frame_errors = 0;
1728         adapter->net_stats.tx_aborted_errors = 0;
1729         adapter->net_stats.tx_carrier_errors = 0;
1730         adapter->net_stats.tx_fifo_errors = 0;
1731         adapter->net_stats.tx_heartbeat_errors = 0;
1732         adapter->net_stats.tx_window_errors = 0;
1733 }
1734
1735 #define IXGB_MAX_INTR 10
1736 /**
1737  * ixgb_intr - Interrupt Handler
1738  * @irq: interrupt number
1739  * @data: pointer to a network interface device structure
1740  **/
1741
1742 static irqreturn_t
1743 ixgb_intr(int irq, void *data)
1744 {
1745         struct net_device *netdev = data;
1746         struct ixgb_adapter *adapter = netdev_priv(netdev);
1747         struct ixgb_hw *hw = &adapter->hw;
1748         uint32_t icr = IXGB_READ_REG(hw, ICR);
1749 #ifndef CONFIG_IXGB_NAPI
1750         unsigned int i;
1751 #endif
1752
1753         if(unlikely(!icr))
1754                 return IRQ_NONE;  /* Not our interrupt */
1755
1756         if(unlikely(icr & (IXGB_INT_RXSEQ | IXGB_INT_LSC))) {
1757                 mod_timer(&adapter->watchdog_timer, jiffies);
1758         }
1759
1760 #ifdef CONFIG_IXGB_NAPI
1761         if (netif_rx_schedule_prep(netdev, &adapter->napi)) {
1762
1763                 /* Disable interrupts and register for poll. The flush
1764                   of the posted write is intentionally left out.
1765                 */
1766
1767                 atomic_inc(&adapter->irq_sem);
1768                 IXGB_WRITE_REG(&adapter->hw, IMC, ~0);
1769                 __netif_rx_schedule(netdev, &adapter->napi);
1770         }
1771 #else
1772         /* yes, that is actually a & and it is meant to make sure that
1773          * every pass through this for loop checks both receive and
1774          * transmit queues for completed descriptors, intended to
1775          * avoid starvation issues and assist tx/rx fairness. */
1776         for(i = 0; i < IXGB_MAX_INTR; i++)
1777                 if(!ixgb_clean_rx_irq(adapter) &
1778                    !ixgb_clean_tx_irq(adapter))
1779                         break;
1780 #endif
1781         return IRQ_HANDLED;
1782 }
1783
1784 #ifdef CONFIG_IXGB_NAPI
1785 /**
1786  * ixgb_clean - NAPI Rx polling callback
1787  * @adapter: board private structure
1788  **/
1789
1790 static int
1791 ixgb_clean(struct napi_struct *napi, int budget)
1792 {
1793         struct ixgb_adapter *adapter = container_of(napi, struct ixgb_adapter, napi);
1794         struct net_device *netdev = adapter->netdev;
1795         int work_done = 0;
1796
1797         ixgb_clean_tx_irq(adapter);
1798         ixgb_clean_rx_irq(adapter, &work_done, budget);
1799
1800         /* If budget not fully consumed, exit the polling mode */
1801         if (work_done < budget) {
1802                 netif_rx_complete(netdev, napi);
1803                 ixgb_irq_enable(adapter);
1804         }
1805
1806         return work_done;
1807 }
1808 #endif
1809
1810 /**
1811  * ixgb_clean_tx_irq - Reclaim resources after transmit completes
1812  * @adapter: board private structure
1813  **/
1814
1815 static boolean_t
1816 ixgb_clean_tx_irq(struct ixgb_adapter *adapter)
1817 {
1818         struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
1819         struct net_device *netdev = adapter->netdev;
1820         struct ixgb_tx_desc *tx_desc, *eop_desc;
1821         struct ixgb_buffer *buffer_info;
1822         unsigned int i, eop;
1823         boolean_t cleaned = FALSE;
1824
1825         i = tx_ring->next_to_clean;
1826         eop = tx_ring->buffer_info[i].next_to_watch;
1827         eop_desc = IXGB_TX_DESC(*tx_ring, eop);
1828
1829         while(eop_desc->status & IXGB_TX_DESC_STATUS_DD) {
1830
1831                 for(cleaned = FALSE; !cleaned; ) {
1832                         tx_desc = IXGB_TX_DESC(*tx_ring, i);
1833                         buffer_info = &tx_ring->buffer_info[i];
1834
1835                         if (tx_desc->popts
1836                             & (IXGB_TX_DESC_POPTS_TXSM |
1837                                IXGB_TX_DESC_POPTS_IXSM))
1838                                 adapter->hw_csum_tx_good++;
1839
1840                         ixgb_unmap_and_free_tx_resource(adapter, buffer_info);
1841
1842                         *(uint32_t *)&(tx_desc->status) = 0;
1843
1844                         cleaned = (i == eop);
1845                         if(++i == tx_ring->count) i = 0;
1846                 }
1847
1848                 eop = tx_ring->buffer_info[i].next_to_watch;
1849                 eop_desc = IXGB_TX_DESC(*tx_ring, eop);
1850         }
1851
1852         tx_ring->next_to_clean = i;
1853
1854         if (unlikely(netif_queue_stopped(netdev))) {
1855                 spin_lock(&adapter->tx_lock);
1856                 if (netif_queue_stopped(netdev) && netif_carrier_ok(netdev) &&
1857                     (IXGB_DESC_UNUSED(tx_ring) >= DESC_NEEDED))
1858                         netif_wake_queue(netdev);
1859                 spin_unlock(&adapter->tx_lock);
1860         }
1861
1862         if(adapter->detect_tx_hung) {
1863                 /* detect a transmit hang in hardware, this serializes the
1864                  * check with the clearing of time_stamp and movement of i */
1865                 adapter->detect_tx_hung = FALSE;
1866                 if (tx_ring->buffer_info[eop].dma &&
1867                    time_after(jiffies, tx_ring->buffer_info[eop].time_stamp + HZ)
1868                    && !(IXGB_READ_REG(&adapter->hw, STATUS) &
1869                         IXGB_STATUS_TXOFF)) {
1870                         /* detected Tx unit hang */
1871                         DPRINTK(DRV, ERR, "Detected Tx Unit Hang\n"
1872                                         "  TDH                  <%x>\n"
1873                                         "  TDT                  <%x>\n"
1874                                         "  next_to_use          <%x>\n"
1875                                         "  next_to_clean        <%x>\n"
1876                                         "buffer_info[next_to_clean]\n"
1877                                         "  time_stamp           <%lx>\n"
1878                                         "  next_to_watch        <%x>\n"
1879                                         "  jiffies              <%lx>\n"
1880                                         "  next_to_watch.status <%x>\n",
1881                                 IXGB_READ_REG(&adapter->hw, TDH),
1882                                 IXGB_READ_REG(&adapter->hw, TDT),
1883                                 tx_ring->next_to_use,
1884                                 tx_ring->next_to_clean,
1885                                 tx_ring->buffer_info[eop].time_stamp,
1886                                 eop,
1887                                 jiffies,
1888                                 eop_desc->status);
1889                         netif_stop_queue(netdev);
1890                 }
1891         }
1892
1893         return cleaned;
1894 }
1895
1896 /**
1897  * ixgb_rx_checksum - Receive Checksum Offload for 82597.
1898  * @adapter: board private structure
1899  * @rx_desc: receive descriptor
1900  * @sk_buff: socket buffer with received data
1901  **/
1902
1903 static void
1904 ixgb_rx_checksum(struct ixgb_adapter *adapter,
1905                  struct ixgb_rx_desc *rx_desc,
1906                  struct sk_buff *skb)
1907 {
1908         /* Ignore Checksum bit is set OR
1909          * TCP Checksum has not been calculated
1910          */
1911         if((rx_desc->status & IXGB_RX_DESC_STATUS_IXSM) ||
1912            (!(rx_desc->status & IXGB_RX_DESC_STATUS_TCPCS))) {
1913                 skb->ip_summed = CHECKSUM_NONE;
1914                 return;
1915         }
1916
1917         /* At this point we know the hardware did the TCP checksum */
1918         /* now look at the TCP checksum error bit */
1919         if(rx_desc->errors & IXGB_RX_DESC_ERRORS_TCPE) {
1920                 /* let the stack verify checksum errors */
1921                 skb->ip_summed = CHECKSUM_NONE;
1922                 adapter->hw_csum_rx_error++;
1923         } else {
1924                 /* TCP checksum is good */
1925                 skb->ip_summed = CHECKSUM_UNNECESSARY;
1926                 adapter->hw_csum_rx_good++;
1927         }
1928 }
1929
1930 /**
1931  * ixgb_clean_rx_irq - Send received data up the network stack,
1932  * @adapter: board private structure
1933  **/
1934
1935 static boolean_t
1936 #ifdef CONFIG_IXGB_NAPI
1937 ixgb_clean_rx_irq(struct ixgb_adapter *adapter, int *work_done, int work_to_do)
1938 #else
1939 ixgb_clean_rx_irq(struct ixgb_adapter *adapter)
1940 #endif
1941 {
1942         struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
1943         struct net_device *netdev = adapter->netdev;
1944         struct pci_dev *pdev = adapter->pdev;
1945         struct ixgb_rx_desc *rx_desc, *next_rxd;
1946         struct ixgb_buffer *buffer_info, *next_buffer, *next2_buffer;
1947         uint32_t length;
1948         unsigned int i, j;
1949         boolean_t cleaned = FALSE;
1950
1951         i = rx_ring->next_to_clean;
1952         rx_desc = IXGB_RX_DESC(*rx_ring, i);
1953         buffer_info = &rx_ring->buffer_info[i];
1954
1955         while(rx_desc->status & IXGB_RX_DESC_STATUS_DD) {
1956                 struct sk_buff *skb, *next_skb;
1957                 u8 status;
1958
1959 #ifdef CONFIG_IXGB_NAPI
1960                 if(*work_done >= work_to_do)
1961                         break;
1962
1963                 (*work_done)++;
1964 #endif
1965                 status = rx_desc->status;
1966                 skb = buffer_info->skb;
1967                 buffer_info->skb = NULL;
1968
1969                 prefetch(skb->data);
1970
1971                 if(++i == rx_ring->count) i = 0;
1972                 next_rxd = IXGB_RX_DESC(*rx_ring, i);
1973                 prefetch(next_rxd);
1974
1975                 if((j = i + 1) == rx_ring->count) j = 0;
1976                 next2_buffer = &rx_ring->buffer_info[j];
1977                 prefetch(next2_buffer);
1978
1979                 next_buffer = &rx_ring->buffer_info[i];
1980                 next_skb = next_buffer->skb;
1981                 prefetch(next_skb);
1982
1983                 cleaned = TRUE;
1984
1985                 pci_unmap_single(pdev,
1986                                  buffer_info->dma,
1987                                  buffer_info->length,
1988                                  PCI_DMA_FROMDEVICE);
1989
1990                 length = le16_to_cpu(rx_desc->length);
1991
1992                 if(unlikely(!(status & IXGB_RX_DESC_STATUS_EOP))) {
1993
1994                         /* All receives must fit into a single buffer */
1995
1996                         IXGB_DBG("Receive packet consumed multiple buffers "
1997                                          "length<%x>\n", length);
1998
1999                         dev_kfree_skb_irq(skb);
2000                         goto rxdesc_done;
2001                 }
2002
2003                 if (unlikely(rx_desc->errors
2004                              & (IXGB_RX_DESC_ERRORS_CE | IXGB_RX_DESC_ERRORS_SE
2005                                 | IXGB_RX_DESC_ERRORS_P |
2006                                 IXGB_RX_DESC_ERRORS_RXE))) {
2007
2008                         dev_kfree_skb_irq(skb);
2009                         goto rxdesc_done;
2010                 }
2011
2012                 /* code added for copybreak, this should improve
2013                  * performance for small packets with large amounts
2014                  * of reassembly being done in the stack */
2015 #define IXGB_CB_LENGTH 256
2016                 if (length < IXGB_CB_LENGTH) {
2017                         struct sk_buff *new_skb =
2018                             netdev_alloc_skb(netdev, length + NET_IP_ALIGN);
2019                         if (new_skb) {
2020                                 skb_reserve(new_skb, NET_IP_ALIGN);
2021                                 skb_copy_to_linear_data_offset(new_skb,
2022                                                                -NET_IP_ALIGN,
2023                                                                (skb->data -
2024                                                                 NET_IP_ALIGN),
2025                                                                (length +
2026                                                                 NET_IP_ALIGN));
2027                                 /* save the skb in buffer_info as good */
2028                                 buffer_info->skb = skb;
2029                                 skb = new_skb;
2030                         }
2031                 }
2032                 /* end copybreak code */
2033
2034                 /* Good Receive */
2035                 skb_put(skb, length);
2036
2037                 /* Receive Checksum Offload */
2038                 ixgb_rx_checksum(adapter, rx_desc, skb);
2039
2040                 skb->protocol = eth_type_trans(skb, netdev);
2041 #ifdef CONFIG_IXGB_NAPI
2042                 if(adapter->vlgrp && (status & IXGB_RX_DESC_STATUS_VP)) {
2043                         vlan_hwaccel_receive_skb(skb, adapter->vlgrp,
2044                                 le16_to_cpu(rx_desc->special) &
2045                                         IXGB_RX_DESC_SPECIAL_VLAN_MASK);
2046                 } else {
2047                         netif_receive_skb(skb);
2048                 }
2049 #else /* CONFIG_IXGB_NAPI */
2050                 if(adapter->vlgrp && (status & IXGB_RX_DESC_STATUS_VP)) {
2051                         vlan_hwaccel_rx(skb, adapter->vlgrp,
2052                                 le16_to_cpu(rx_desc->special) &
2053                                         IXGB_RX_DESC_SPECIAL_VLAN_MASK);
2054                 } else {
2055                         netif_rx(skb);
2056                 }
2057 #endif /* CONFIG_IXGB_NAPI */
2058                 netdev->last_rx = jiffies;
2059
2060 rxdesc_done:
2061                 /* clean up descriptor, might be written over by hw */
2062                 rx_desc->status = 0;
2063
2064                 /* use prefetched values */
2065                 rx_desc = next_rxd;
2066                 buffer_info = next_buffer;
2067         }
2068
2069         rx_ring->next_to_clean = i;
2070
2071         ixgb_alloc_rx_buffers(adapter);
2072
2073         return cleaned;
2074 }
2075
2076 /**
2077  * ixgb_alloc_rx_buffers - Replace used receive buffers
2078  * @adapter: address of board private structure
2079  **/
2080
2081 static void
2082 ixgb_alloc_rx_buffers(struct ixgb_adapter *adapter)
2083 {
2084         struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
2085         struct net_device *netdev = adapter->netdev;
2086         struct pci_dev *pdev = adapter->pdev;
2087         struct ixgb_rx_desc *rx_desc;
2088         struct ixgb_buffer *buffer_info;
2089         struct sk_buff *skb;
2090         unsigned int i;
2091         long cleancount;
2092
2093         i = rx_ring->next_to_use;
2094         buffer_info = &rx_ring->buffer_info[i];
2095         cleancount = IXGB_DESC_UNUSED(rx_ring);
2096
2097
2098         /* leave three descriptors unused */
2099         while(--cleancount > 2) {
2100                 /* recycle! its good for you */
2101                 skb = buffer_info->skb;
2102                 if (skb) {
2103                         skb_trim(skb, 0);
2104                         goto map_skb;
2105                 }
2106
2107                 skb = netdev_alloc_skb(netdev, adapter->rx_buffer_len
2108                                        + NET_IP_ALIGN);
2109                 if (unlikely(!skb)) {
2110                         /* Better luck next round */
2111                         adapter->alloc_rx_buff_failed++;
2112                         break;
2113                 }
2114
2115                 /* Make buffer alignment 2 beyond a 16 byte boundary
2116                  * this will result in a 16 byte aligned IP header after
2117                  * the 14 byte MAC header is removed
2118                  */
2119                 skb_reserve(skb, NET_IP_ALIGN);
2120
2121                 buffer_info->skb = skb;
2122                 buffer_info->length = adapter->rx_buffer_len;
2123 map_skb:
2124                 buffer_info->dma = pci_map_single(pdev,
2125                                                   skb->data,
2126                                                   adapter->rx_buffer_len,
2127                                                   PCI_DMA_FROMDEVICE);
2128
2129                 rx_desc = IXGB_RX_DESC(*rx_ring, i);
2130                 rx_desc->buff_addr = cpu_to_le64(buffer_info->dma);
2131                 /* guarantee DD bit not set now before h/w gets descriptor
2132                  * this is the rest of the workaround for h/w double
2133                  * writeback. */
2134                 rx_desc->status = 0;
2135
2136
2137                 if(++i == rx_ring->count) i = 0;
2138                 buffer_info = &rx_ring->buffer_info[i];
2139         }
2140
2141         if (likely(rx_ring->next_to_use != i)) {
2142                 rx_ring->next_to_use = i;
2143                 if (unlikely(i-- == 0))
2144                         i = (rx_ring->count - 1);
2145
2146                 /* Force memory writes to complete before letting h/w
2147                  * know there are new descriptors to fetch.  (Only
2148                  * applicable for weak-ordered memory model archs, such
2149                  * as IA-64). */
2150                 wmb();
2151                 IXGB_WRITE_REG(&adapter->hw, RDT, i);
2152         }
2153 }
2154
2155 /**
2156  * ixgb_vlan_rx_register - enables or disables vlan tagging/stripping.
2157  *
2158  * @param netdev network interface device structure
2159  * @param grp indicates to enable or disable tagging/stripping
2160  **/
2161 static void
2162 ixgb_vlan_rx_register(struct net_device *netdev, struct vlan_group *grp)
2163 {
2164         struct ixgb_adapter *adapter = netdev_priv(netdev);
2165         uint32_t ctrl, rctl;
2166
2167         ixgb_irq_disable(adapter);
2168         adapter->vlgrp = grp;
2169
2170         if(grp) {
2171                 /* enable VLAN tag insert/strip */
2172                 ctrl = IXGB_READ_REG(&adapter->hw, CTRL0);
2173                 ctrl |= IXGB_CTRL0_VME;
2174                 IXGB_WRITE_REG(&adapter->hw, CTRL0, ctrl);
2175
2176                 /* enable VLAN receive filtering */
2177
2178                 rctl = IXGB_READ_REG(&adapter->hw, RCTL);
2179                 rctl |= IXGB_RCTL_VFE;
2180                 rctl &= ~IXGB_RCTL_CFIEN;
2181                 IXGB_WRITE_REG(&adapter->hw, RCTL, rctl);
2182         } else {
2183                 /* disable VLAN tag insert/strip */
2184
2185                 ctrl = IXGB_READ_REG(&adapter->hw, CTRL0);
2186                 ctrl &= ~IXGB_CTRL0_VME;
2187                 IXGB_WRITE_REG(&adapter->hw, CTRL0, ctrl);
2188
2189                 /* disable VLAN filtering */
2190
2191                 rctl = IXGB_READ_REG(&adapter->hw, RCTL);
2192                 rctl &= ~IXGB_RCTL_VFE;
2193                 IXGB_WRITE_REG(&adapter->hw, RCTL, rctl);
2194         }
2195
2196         ixgb_irq_enable(adapter);
2197 }
2198
2199 static void
2200 ixgb_vlan_rx_add_vid(struct net_device *netdev, uint16_t vid)
2201 {
2202         struct ixgb_adapter *adapter = netdev_priv(netdev);
2203         uint32_t vfta, index;
2204
2205         /* add VID to filter table */
2206
2207         index = (vid >> 5) & 0x7F;
2208         vfta = IXGB_READ_REG_ARRAY(&adapter->hw, VFTA, index);
2209         vfta |= (1 << (vid & 0x1F));
2210         ixgb_write_vfta(&adapter->hw, index, vfta);
2211 }
2212
2213 static void
2214 ixgb_vlan_rx_kill_vid(struct net_device *netdev, uint16_t vid)
2215 {
2216         struct ixgb_adapter *adapter = netdev_priv(netdev);
2217         uint32_t vfta, index;
2218
2219         ixgb_irq_disable(adapter);
2220
2221         vlan_group_set_device(adapter->vlgrp, vid, NULL);
2222
2223         ixgb_irq_enable(adapter);
2224
2225         /* remove VID from filter table*/
2226
2227         index = (vid >> 5) & 0x7F;
2228         vfta = IXGB_READ_REG_ARRAY(&adapter->hw, VFTA, index);
2229         vfta &= ~(1 << (vid & 0x1F));
2230         ixgb_write_vfta(&adapter->hw, index, vfta);
2231 }
2232
2233 static void
2234 ixgb_restore_vlan(struct ixgb_adapter *adapter)
2235 {
2236         ixgb_vlan_rx_register(adapter->netdev, adapter->vlgrp);
2237
2238         if(adapter->vlgrp) {
2239                 uint16_t vid;
2240                 for(vid = 0; vid < VLAN_GROUP_ARRAY_LEN; vid++) {
2241                         if(!vlan_group_get_device(adapter->vlgrp, vid))
2242                                 continue;
2243                         ixgb_vlan_rx_add_vid(adapter->netdev, vid);
2244                 }
2245         }
2246 }
2247
2248 #ifdef CONFIG_NET_POLL_CONTROLLER
2249 /*
2250  * Polling 'interrupt' - used by things like netconsole to send skbs
2251  * without having to re-enable interrupts. It's not called while
2252  * the interrupt routine is executing.
2253  */
2254
2255 static void ixgb_netpoll(struct net_device *dev)
2256 {
2257         struct ixgb_adapter *adapter = netdev_priv(dev);
2258
2259         disable_irq(adapter->pdev->irq);
2260         ixgb_intr(adapter->pdev->irq, dev);
2261         enable_irq(adapter->pdev->irq);
2262 }
2263 #endif
2264
2265 /**
2266  * ixgb_io_error_detected() - called when PCI error is detected
2267  * @pdev    pointer to pci device with error
2268  * @state   pci channel state after error
2269  *
2270  * This callback is called by the PCI subsystem whenever
2271  * a PCI bus error is detected.
2272  */
2273 static pci_ers_result_t ixgb_io_error_detected (struct pci_dev *pdev,
2274                                      enum pci_channel_state state)
2275 {
2276         struct net_device *netdev = pci_get_drvdata(pdev);
2277         struct ixgb_adapter *adapter = netdev_priv(netdev);
2278
2279         if(netif_running(netdev))
2280                 ixgb_down(adapter, TRUE);
2281
2282         pci_disable_device(pdev);
2283
2284         /* Request a slot reset. */
2285         return PCI_ERS_RESULT_NEED_RESET;
2286 }
2287
2288 /**
2289  * ixgb_io_slot_reset - called after the pci bus has been reset.
2290  * @pdev    pointer to pci device with error
2291  *
2292  * This callback is called after the PCI buss has been reset.
2293  * Basically, this tries to restart the card from scratch.
2294  * This is a shortened version of the device probe/discovery code,
2295  * it resembles the first-half of the ixgb_probe() routine.
2296  */
2297 static pci_ers_result_t ixgb_io_slot_reset (struct pci_dev *pdev)
2298 {
2299         struct net_device *netdev = pci_get_drvdata(pdev);
2300         struct ixgb_adapter *adapter = netdev_priv(netdev);
2301
2302         if(pci_enable_device(pdev)) {
2303                 DPRINTK(PROBE, ERR, "Cannot re-enable PCI device after reset.\n");
2304                 return PCI_ERS_RESULT_DISCONNECT;
2305         }
2306
2307         /* Perform card reset only on one instance of the card */
2308         if (0 != PCI_FUNC (pdev->devfn))
2309                 return PCI_ERS_RESULT_RECOVERED;
2310
2311         pci_set_master(pdev);
2312
2313         netif_carrier_off(netdev);
2314         netif_stop_queue(netdev);
2315         ixgb_reset(adapter);
2316
2317         /* Make sure the EEPROM is good */
2318         if(!ixgb_validate_eeprom_checksum(&adapter->hw)) {
2319                 DPRINTK(PROBE, ERR, "After reset, the EEPROM checksum is not valid.\n");
2320                 return PCI_ERS_RESULT_DISCONNECT;
2321         }
2322         ixgb_get_ee_mac_addr(&adapter->hw, netdev->dev_addr);
2323         memcpy(netdev->perm_addr, netdev->dev_addr, netdev->addr_len);
2324
2325         if(!is_valid_ether_addr(netdev->perm_addr)) {
2326                 DPRINTK(PROBE, ERR, "After reset, invalid MAC address.\n");
2327                 return PCI_ERS_RESULT_DISCONNECT;
2328         }
2329
2330         return PCI_ERS_RESULT_RECOVERED;
2331 }
2332
2333 /**
2334  * ixgb_io_resume - called when its OK to resume normal operations
2335  * @pdev    pointer to pci device with error
2336  *
2337  * The error recovery driver tells us that its OK to resume
2338  * normal operation. Implementation resembles the second-half
2339  * of the ixgb_probe() routine.
2340  */
2341 static void ixgb_io_resume (struct pci_dev *pdev)
2342 {
2343         struct net_device *netdev = pci_get_drvdata(pdev);
2344         struct ixgb_adapter *adapter = netdev_priv(netdev);
2345
2346         pci_set_master(pdev);
2347
2348         if(netif_running(netdev)) {
2349                 if(ixgb_up(adapter)) {
2350                         printk ("ixgb: can't bring device back up after reset\n");
2351                         return;
2352                 }
2353         }
2354
2355         netif_device_attach(netdev);
2356         mod_timer(&adapter->watchdog_timer, jiffies);
2357 }
2358
2359 /* ixgb_main.c */