err.no Git - linux-2.6/blob - drivers/net/ixgb/ixgb_main.c

   1 /*******************************************************************************
   2
   3   Intel PRO/10GbE Linux driver
   4   Copyright(c) 1999 - 2006 Intel Corporation.
   5
   6   This program is free software; you can redistribute it and/or modify it
   7   under the terms and conditions of the GNU General Public License,
   8   version 2, as published by the Free Software Foundation.
   9
  10   This program is distributed in the hope it will be useful, but WITHOUT
  11   ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  12   FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  13   more details.
  14
  15   You should have received a copy of the GNU General Public License along with
  16   this program; if not, write to the Free Software Foundation, Inc.,
  17   51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
  18
  19   The full GNU General Public License is included in this distribution in
  20   the file called "COPYING".
  21
  22   Contact Information:
  23   Linux NICS <linux.nics@intel.com>
  24   e1000-devel Mailing List <e1000-devel@lists.sourceforge.net>
  25   Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
  26
  27 *******************************************************************************/
  28
  29 #include "ixgb.h"
  30
  31 char ixgb_driver_name[] = "ixgb";
  32 static char ixgb_driver_string[] = "Intel(R) PRO/10GbE Network Driver";
  33
  34 #ifndef CONFIG_IXGB_NAPI
  35 #define DRIVERNAPI
  36 #else
  37 #define DRIVERNAPI "-NAPI"
  38 #endif
  39 #define DRV_VERSION             "1.0.126-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, bool 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 bool 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 bool ixgb_clean_rx_irq(struct ixgb_adapter *adapter,
 102                               int *work_done, int work_to_do);
 103 #else
 104 static bool 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, u16 vid);
 112 static void ixgb_vlan_rx_kill_vid(struct net_device *netdev, u16 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 /**
 150  * ixgb_init_module - Driver Registration Routine
 151  *
 152  * ixgb_init_module is the first routine called when the driver is
 153  * loaded. All it does is register with the PCI subsystem.
 154  **/
 155
 156 static int __init
 157 ixgb_init_module(void)
 158 {
 159         printk(KERN_INFO "%s - version %s\n",
 160                ixgb_driver_string, ixgb_driver_version);
 161
 162         printk(KERN_INFO "%s\n", ixgb_copyright);
 163
 164         return pci_register_driver(&ixgb_driver);
 165 }
 166
 167 module_init(ixgb_init_module);
 168
 169 /**
 170  * ixgb_exit_module - Driver Exit Cleanup Routine
 171  *
 172  * ixgb_exit_module is called just before the driver is removed
 173  * from memory.
 174  **/
 175
 176 static void __exit
 177 ixgb_exit_module(void)
 178 {
 179         pci_unregister_driver(&ixgb_driver);
 180 }
 181
 182 module_exit(ixgb_exit_module);
 183
 184 /**
 185  * ixgb_irq_disable - Mask off interrupt generation on the NIC
 186  * @adapter: board private structure
 187  **/
 188
 189 static void
 190 ixgb_irq_disable(struct ixgb_adapter *adapter)
 191 {
 192         IXGB_WRITE_REG(&adapter->hw, IMC, ~0);
 193         IXGB_WRITE_FLUSH(&adapter->hw);
 194         synchronize_irq(adapter->pdev->irq);
 195 }
 196
 197 /**
 198  * ixgb_irq_enable - Enable default interrupt generation settings
 199  * @adapter: board private structure
 200  **/
 201
 202 static void
 203 ixgb_irq_enable(struct ixgb_adapter *adapter)
 204 {
 205         u32 val = IXGB_INT_RXT0 | IXGB_INT_RXDMT0 |
 206                   IXGB_INT_TXDW | IXGB_INT_LSC;
 207         if (adapter->hw.subsystem_vendor_id == SUN_SUBVENDOR_ID)
 208                 val |= IXGB_INT_GPI0;
 209         IXGB_WRITE_REG(&adapter->hw, IMS, val);
 210         IXGB_WRITE_FLUSH(&adapter->hw);
 211 }
 212
 213 int
 214 ixgb_up(struct ixgb_adapter *adapter)
 215 {
 216         struct net_device *netdev = adapter->netdev;
 217         int err, irq_flags = IRQF_SHARED;
 218         int max_frame = netdev->mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;
 219         struct ixgb_hw *hw = &adapter->hw;
 220
 221         /* hardware has been reset, we need to reload some things */
 222
 223         ixgb_rar_set(hw, netdev->dev_addr, 0);
 224         ixgb_set_multi(netdev);
 225
 226         ixgb_restore_vlan(adapter);
 227
 228         ixgb_configure_tx(adapter);
 229         ixgb_setup_rctl(adapter);
 230         ixgb_configure_rx(adapter);
 231         ixgb_alloc_rx_buffers(adapter);
 232
 233         /* disable interrupts and get the hardware into a known state */
 234         IXGB_WRITE_REG(&adapter->hw, IMC, 0xffffffff);
 235
 236         /* only enable MSI if bus is in PCI-X mode */
 237         if (IXGB_READ_REG(&adapter->hw, STATUS) & IXGB_STATUS_PCIX_MODE) {
 238                 err = pci_enable_msi(adapter->pdev);
 239                 if (!err) {
 240                         adapter->have_msi = 1;
 241                         irq_flags = 0;
 242                 }
 243                 /* proceed to try to request regular interrupt */
 244         }
 245
 246         err = request_irq(adapter->pdev->irq, &ixgb_intr, irq_flags,
 247                           netdev->name, netdev);
 248         if (err) {
 249                 if (adapter->have_msi)
 250                         pci_disable_msi(adapter->pdev);
 251                 DPRINTK(PROBE, ERR,
 252                  "Unable to allocate interrupt Error: %d\n", err);
 253                 return err;
 254         }
 255
 256         if((hw->max_frame_size != max_frame) ||
 257                 (hw->max_frame_size !=
 258                 (IXGB_READ_REG(hw, MFS) >> IXGB_MFS_SHIFT))) {
 259
 260                 hw->max_frame_size = max_frame;
 261
 262                 IXGB_WRITE_REG(hw, MFS, hw->max_frame_size << IXGB_MFS_SHIFT);
 263
 264                 if(hw->max_frame_size >
 265                    IXGB_MAX_ENET_FRAME_SIZE_WITHOUT_FCS + ENET_FCS_LENGTH) {
 266                         u32 ctrl0 = IXGB_READ_REG(hw, CTRL0);
 267
 268                         if(!(ctrl0 & IXGB_CTRL0_JFE)) {
 269                                 ctrl0 |= IXGB_CTRL0_JFE;
 270                                 IXGB_WRITE_REG(hw, CTRL0, ctrl0);
 271                         }
 272                 }
 273         }
 274
 275         clear_bit(__IXGB_DOWN, &adapter->flags);
 276
 277 #ifdef CONFIG_IXGB_NAPI
 278         napi_enable(&adapter->napi);
 279 #endif
 280         ixgb_irq_enable(adapter);
 281
 282         mod_timer(&adapter->watchdog_timer, jiffies);
 283
 284         return 0;
 285 }
 286
 287 void
 288 ixgb_down(struct ixgb_adapter *adapter, bool kill_watchdog)
 289 {
 290         struct net_device *netdev = adapter->netdev;
 291
 292         /* prevent the interrupt handler from restarting watchdog */
 293         set_bit(__IXGB_DOWN, &adapter->flags);
 294
 295 #ifdef CONFIG_IXGB_NAPI
 296         napi_disable(&adapter->napi);
 297 #endif
 298         /* waiting for NAPI to complete can re-enable interrupts */
 299         ixgb_irq_disable(adapter);
 300         free_irq(adapter->pdev->irq, netdev);
 301
 302         if (adapter->have_msi)
 303                 pci_disable_msi(adapter->pdev);
 304
 305         if(kill_watchdog)
 306                 del_timer_sync(&adapter->watchdog_timer);
 307
 308         adapter->link_speed = 0;
 309         adapter->link_duplex = 0;
 310         netif_carrier_off(netdev);
 311         netif_stop_queue(netdev);
 312
 313         ixgb_reset(adapter);
 314         ixgb_clean_tx_ring(adapter);
 315         ixgb_clean_rx_ring(adapter);
 316 }
 317
 318 void
 319 ixgb_reset(struct ixgb_adapter *adapter)
 320 {
 321         struct ixgb_hw *hw = &adapter->hw;
 322
 323         ixgb_adapter_stop(hw);
 324         if (!ixgb_init_hw(hw))
 325                 DPRINTK(PROBE, ERR, "ixgb_init_hw failed.\n");
 326
 327         /* restore frame size information */
 328         IXGB_WRITE_REG(hw, MFS, hw->max_frame_size << IXGB_MFS_SHIFT);
 329         if (hw->max_frame_size >
 330             IXGB_MAX_ENET_FRAME_SIZE_WITHOUT_FCS + ENET_FCS_LENGTH) {
 331                 u32 ctrl0 = IXGB_READ_REG(hw, CTRL0);
 332                 if (!(ctrl0 & IXGB_CTRL0_JFE)) {
 333                         ctrl0 |= IXGB_CTRL0_JFE;
 334                         IXGB_WRITE_REG(hw, CTRL0, ctrl0);
 335                 }
 336         }
 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         int pci_using_dac;
 359         int i;
 360         int err;
 361
 362         if((err = pci_enable_device(pdev)))
 363                 return err;
 364
 365         if(!(err = pci_set_dma_mask(pdev, DMA_64BIT_MASK)) &&
 366            !(err = pci_set_consistent_dma_mask(pdev, DMA_64BIT_MASK))) {
 367                 pci_using_dac = 1;
 368         } else {
 369                 if((err = pci_set_dma_mask(pdev, DMA_32BIT_MASK)) ||
 370                    (err = pci_set_consistent_dma_mask(pdev, DMA_32BIT_MASK))) {
 371                         printk(KERN_ERR
 372                          "ixgb: No usable DMA configuration, aborting\n");
 373                         goto err_dma_mask;
 374                 }
 375                 pci_using_dac = 0;
 376         }
 377
 378         if((err = pci_request_regions(pdev, ixgb_driver_name)))
 379                 goto err_request_regions;
 380
 381         pci_set_master(pdev);
 382
 383         netdev = alloc_etherdev(sizeof(struct ixgb_adapter));
 384         if(!netdev) {
 385                 err = -ENOMEM;
 386                 goto err_alloc_etherdev;
 387         }
 388
 389         SET_NETDEV_DEV(netdev, &pdev->dev);
 390
 391         pci_set_drvdata(pdev, netdev);
 392         adapter = netdev_priv(netdev);
 393         adapter->netdev = netdev;
 394         adapter->pdev = pdev;
 395         adapter->hw.back = adapter;
 396         adapter->msg_enable = netif_msg_init(debug, DEFAULT_DEBUG_LEVEL_SHIFT);
 397
 398         adapter->hw.hw_addr = ioremap(pci_resource_start(pdev, BAR_0),
 399                                       pci_resource_len(pdev, BAR_0));
 400         if (!adapter->hw.hw_addr) {
 401                 err = -EIO;
 402                 goto err_ioremap;
 403         }
 404
 405         for(i = BAR_1; i <= BAR_5; i++) {
 406                 if(pci_resource_len(pdev, i) == 0)
 407                         continue;
 408                 if(pci_resource_flags(pdev, i) & IORESOURCE_IO) {
 409                         adapter->hw.io_base = pci_resource_start(pdev, i);
 410                         break;
 411                 }
 412         }
 413
 414         netdev->open = &ixgb_open;
 415         netdev->stop = &ixgb_close;
 416         netdev->hard_start_xmit = &ixgb_xmit_frame;
 417         netdev->get_stats = &ixgb_get_stats;
 418         netdev->set_multicast_list = &ixgb_set_multi;
 419         netdev->set_mac_address = &ixgb_set_mac;
 420         netdev->change_mtu = &ixgb_change_mtu;
 421         ixgb_set_ethtool_ops(netdev);
 422         netdev->tx_timeout = &ixgb_tx_timeout;
 423         netdev->watchdog_timeo = 5 * HZ;
 424 #ifdef CONFIG_IXGB_NAPI
 425         netif_napi_add(netdev, &adapter->napi, ixgb_clean, 64);
 426 #endif
 427         netdev->vlan_rx_register = ixgb_vlan_rx_register;
 428         netdev->vlan_rx_add_vid = ixgb_vlan_rx_add_vid;
 429         netdev->vlan_rx_kill_vid = ixgb_vlan_rx_kill_vid;
 430 #ifdef CONFIG_NET_POLL_CONTROLLER
 431         netdev->poll_controller = ixgb_netpoll;
 432 #endif
 433
 434         strncpy(netdev->name, pci_name(pdev), sizeof(netdev->name) - 1);
 435
 436         adapter->bd_number = cards_found;
 437         adapter->link_speed = 0;
 438         adapter->link_duplex = 0;
 439
 440         /* setup the private structure */
 441
 442         if((err = ixgb_sw_init(adapter)))
 443                 goto err_sw_init;
 444
 445         netdev->features = NETIF_F_SG |
 446                            NETIF_F_HW_CSUM |
 447                            NETIF_F_HW_VLAN_TX |
 448                            NETIF_F_HW_VLAN_RX |
 449                            NETIF_F_HW_VLAN_FILTER;
 450         netdev->features |= NETIF_F_TSO;
 451 #ifdef NETIF_F_LLTX
 452         netdev->features |= NETIF_F_LLTX;
 453 #endif
 454
 455         if(pci_using_dac)
 456                 netdev->features |= NETIF_F_HIGHDMA;
 457
 458         /* make sure the EEPROM is good */
 459
 460         if(!ixgb_validate_eeprom_checksum(&adapter->hw)) {
 461                 DPRINTK(PROBE, ERR, "The EEPROM Checksum Is Not Valid\n");
 462                 err = -EIO;
 463                 goto err_eeprom;
 464         }
 465
 466         ixgb_get_ee_mac_addr(&adapter->hw, netdev->dev_addr);
 467         memcpy(netdev->perm_addr, netdev->dev_addr, netdev->addr_len);
 468
 469         if(!is_valid_ether_addr(netdev->perm_addr)) {
 470                 DPRINTK(PROBE, ERR, "Invalid MAC Address\n");
 471                 err = -EIO;
 472                 goto err_eeprom;
 473         }
 474
 475         adapter->part_num = ixgb_get_ee_pba_number(&adapter->hw);
 476
 477         init_timer(&adapter->watchdog_timer);
 478         adapter->watchdog_timer.function = &ixgb_watchdog;
 479         adapter->watchdog_timer.data = (unsigned long)adapter;
 480
 481         INIT_WORK(&adapter->tx_timeout_task, ixgb_tx_timeout_task);
 482
 483         strcpy(netdev->name, "eth%d");
 484         if((err = register_netdev(netdev)))
 485                 goto err_register;
 486
 487         /* we're going to reset, so assume we have no link for now */
 488
 489         netif_carrier_off(netdev);
 490         netif_stop_queue(netdev);
 491
 492         DPRINTK(PROBE, INFO, "Intel(R) PRO/10GbE Network Connection\n");
 493         ixgb_check_options(adapter);
 494         /* reset the hardware with the new settings */
 495
 496         ixgb_reset(adapter);
 497
 498         cards_found++;
 499         return 0;
 500
 501 err_register:
 502 err_sw_init:
 503 err_eeprom:
 504         iounmap(adapter->hw.hw_addr);
 505 err_ioremap:
 506         free_netdev(netdev);
 507 err_alloc_etherdev:
 508         pci_release_regions(pdev);
 509 err_request_regions:
 510 err_dma_mask:
 511         pci_disable_device(pdev);
 512         return err;
 513 }
 514
 515 /**
 516  * ixgb_remove - Device Removal Routine
 517  * @pdev: PCI device information struct
 518  *
 519  * ixgb_remove is called by the PCI subsystem to alert the driver
 520  * that it should release a PCI device.  The could be caused by a
 521  * Hot-Plug event, or because the driver is going to be removed from
 522  * memory.
 523  **/
 524
 525 static void __devexit
 526 ixgb_remove(struct pci_dev *pdev)
 527 {
 528         struct net_device *netdev = pci_get_drvdata(pdev);
 529         struct ixgb_adapter *adapter = netdev_priv(netdev);
 530
 531         flush_scheduled_work();
 532
 533         unregister_netdev(netdev);
 534
 535         iounmap(adapter->hw.hw_addr);
 536         pci_release_regions(pdev);
 537
 538         free_netdev(netdev);
 539 }
 540
 541 /**
 542  * ixgb_sw_init - Initialize general software structures (struct ixgb_adapter)
 543  * @adapter: board private structure to initialize
 544  *
 545  * ixgb_sw_init initializes the Adapter private data structure.
 546  * Fields are initialized based on PCI device information and
 547  * OS network device settings (MTU size).
 548  **/
 549
 550 static int __devinit
 551 ixgb_sw_init(struct ixgb_adapter *adapter)
 552 {
 553         struct ixgb_hw *hw = &adapter->hw;
 554         struct net_device *netdev = adapter->netdev;
 555         struct pci_dev *pdev = adapter->pdev;
 556
 557         /* PCI config space info */
 558
 559         hw->vendor_id = pdev->vendor;
 560         hw->device_id = pdev->device;
 561         hw->subsystem_vendor_id = pdev->subsystem_vendor;
 562         hw->subsystem_id = pdev->subsystem_device;
 563
 564         hw->max_frame_size = netdev->mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;
 565         adapter->rx_buffer_len = hw->max_frame_size + 8; /* + 8 for errata */
 566
 567         if((hw->device_id == IXGB_DEVICE_ID_82597EX)
 568            || (hw->device_id == IXGB_DEVICE_ID_82597EX_CX4)
 569            || (hw->device_id == IXGB_DEVICE_ID_82597EX_LR)
 570            || (hw->device_id == IXGB_DEVICE_ID_82597EX_SR))
 571                         hw->mac_type = ixgb_82597;
 572         else {
 573                 /* should never have loaded on this device */
 574                 DPRINTK(PROBE, ERR, "unsupported device id\n");
 575         }
 576
 577         /* enable flow control to be programmed */
 578         hw->fc.send_xon = 1;
 579
 580         spin_lock_init(&adapter->tx_lock);
 581
 582         set_bit(__IXGB_DOWN, &adapter->flags);
 583         return 0;
 584 }
 585
 586 /**
 587  * ixgb_open - Called when a network interface is made active
 588  * @netdev: network interface device structure
 589  *
 590  * Returns 0 on success, negative value on failure
 591  *
 592  * The open entry point is called when a network interface is made
 593  * active by the system (IFF_UP).  At this point all resources needed
 594  * for transmit and receive operations are allocated, the interrupt
 595  * handler is registered with the OS, the watchdog timer is started,
 596  * and the stack is notified that the interface is ready.
 597  **/
 598
 599 static int
 600 ixgb_open(struct net_device *netdev)
 601 {
 602         struct ixgb_adapter *adapter = netdev_priv(netdev);
 603         int err;
 604
 605         /* allocate transmit descriptors */
 606
 607         if((err = ixgb_setup_tx_resources(adapter)))
 608                 goto err_setup_tx;
 609
 610         /* allocate receive descriptors */
 611
 612         if((err = ixgb_setup_rx_resources(adapter)))
 613                 goto err_setup_rx;
 614
 615         if((err = ixgb_up(adapter)))
 616                 goto err_up;
 617
 618         return 0;
 619
 620 err_up:
 621         ixgb_free_rx_resources(adapter);
 622 err_setup_rx:
 623         ixgb_free_tx_resources(adapter);
 624 err_setup_tx:
 625         ixgb_reset(adapter);
 626
 627         return err;
 628 }
 629
 630 /**
 631  * ixgb_close - Disables a network interface
 632  * @netdev: network interface device structure
 633  *
 634  * Returns 0, this is not allowed to fail
 635  *
 636  * The close entry point is called when an interface is de-activated
 637  * by the OS.  The hardware is still under the drivers control, but
 638  * needs to be disabled.  A global MAC reset is issued to stop the
 639  * hardware, and all transmit and receive resources are freed.
 640  **/
 641
 642 static int
 643 ixgb_close(struct net_device *netdev)
 644 {
 645         struct ixgb_adapter *adapter = netdev_priv(netdev);
 646
 647         ixgb_down(adapter, true);
 648
 649         ixgb_free_tx_resources(adapter);
 650         ixgb_free_rx_resources(adapter);
 651
 652         return 0;
 653 }
 654
 655 /**
 656  * ixgb_setup_tx_resources - allocate Tx resources (Descriptors)
 657  * @adapter: board private structure
 658  *
 659  * Return 0 on success, negative on failure
 660  **/
 661
 662 int
 663 ixgb_setup_tx_resources(struct ixgb_adapter *adapter)
 664 {
 665         struct ixgb_desc_ring *txdr = &adapter->tx_ring;
 666         struct pci_dev *pdev = adapter->pdev;
 667         int size;
 668
 669         size = sizeof(struct ixgb_buffer) * txdr->count;
 670         txdr->buffer_info = vmalloc(size);
 671         if(!txdr->buffer_info) {
 672                 DPRINTK(PROBE, ERR,
 673                  "Unable to allocate transmit descriptor ring memory\n");
 674                 return -ENOMEM;
 675         }
 676         memset(txdr->buffer_info, 0, size);
 677
 678         /* round up to nearest 4K */
 679
 680         txdr->size = txdr->count * sizeof(struct ixgb_tx_desc);
 681         txdr->size = ALIGN(txdr->size, 4096);
 682
 683         txdr->desc = pci_alloc_consistent(pdev, txdr->size, &txdr->dma);
 684         if(!txdr->desc) {
 685                 vfree(txdr->buffer_info);
 686                 DPRINTK(PROBE, ERR,
 687                  "Unable to allocate transmit descriptor memory\n");
 688                 return -ENOMEM;
 689         }
 690         memset(txdr->desc, 0, txdr->size);
 691
 692         txdr->next_to_use = 0;
 693         txdr->next_to_clean = 0;
 694
 695         return 0;
 696 }
 697
 698 /**
 699  * ixgb_configure_tx - Configure 82597 Transmit Unit after Reset.
 700  * @adapter: board private structure
 701  *
 702  * Configure the Tx unit of the MAC after a reset.
 703  **/
 704
 705 static void
 706 ixgb_configure_tx(struct ixgb_adapter *adapter)
 707 {
 708         u64 tdba = adapter->tx_ring.dma;
 709         u32 tdlen = adapter->tx_ring.count * sizeof(struct ixgb_tx_desc);
 710         u32 tctl;
 711         struct ixgb_hw *hw = &adapter->hw;
 712
 713         /* Setup the Base and Length of the Tx Descriptor Ring
 714          * tx_ring.dma can be either a 32 or 64 bit value
 715          */
 716
 717         IXGB_WRITE_REG(hw, TDBAL, (tdba & 0x00000000ffffffffULL));
 718         IXGB_WRITE_REG(hw, TDBAH, (tdba >> 32));
 719
 720         IXGB_WRITE_REG(hw, TDLEN, tdlen);
 721
 722         /* Setup the HW Tx Head and Tail descriptor pointers */
 723
 724         IXGB_WRITE_REG(hw, TDH, 0);
 725         IXGB_WRITE_REG(hw, TDT, 0);
 726
 727         /* don't set up txdctl, it induces performance problems if configured
 728          * incorrectly */
 729         /* Set the Tx Interrupt Delay register */
 730
 731         IXGB_WRITE_REG(hw, TIDV, adapter->tx_int_delay);
 732
 733         /* Program the Transmit Control Register */
 734
 735         tctl = IXGB_TCTL_TCE | IXGB_TCTL_TXEN | IXGB_TCTL_TPDE;
 736         IXGB_WRITE_REG(hw, TCTL, tctl);
 737
 738         /* Setup Transmit Descriptor Settings for this adapter */
 739         adapter->tx_cmd_type =
 740                 IXGB_TX_DESC_TYPE
 741                 | (adapter->tx_int_delay_enable ? IXGB_TX_DESC_CMD_IDE : 0);
 742 }
 743
 744 /**
 745  * ixgb_setup_rx_resources - allocate Rx resources (Descriptors)
 746  * @adapter: board private structure
 747  *
 748  * Returns 0 on success, negative on failure
 749  **/
 750
 751 int
 752 ixgb_setup_rx_resources(struct ixgb_adapter *adapter)
 753 {
 754         struct ixgb_desc_ring *rxdr = &adapter->rx_ring;
 755         struct pci_dev *pdev = adapter->pdev;
 756         int size;
 757
 758         size = sizeof(struct ixgb_buffer) * rxdr->count;
 759         rxdr->buffer_info = vmalloc(size);
 760         if(!rxdr->buffer_info) {
 761                 DPRINTK(PROBE, ERR,
 762                  "Unable to allocate receive descriptor ring\n");
 763                 return -ENOMEM;
 764         }
 765         memset(rxdr->buffer_info, 0, size);
 766
 767         /* Round up to nearest 4K */
 768
 769         rxdr->size = rxdr->count * sizeof(struct ixgb_rx_desc);
 770         rxdr->size = ALIGN(rxdr->size, 4096);
 771
 772         rxdr->desc = pci_alloc_consistent(pdev, rxdr->size, &rxdr->dma);
 773
 774         if(!rxdr->desc) {
 775                 vfree(rxdr->buffer_info);
 776                 DPRINTK(PROBE, ERR,
 777                  "Unable to allocate receive descriptors\n");
 778                 return -ENOMEM;
 779         }
 780         memset(rxdr->desc, 0, rxdr->size);
 781
 782         rxdr->next_to_clean = 0;
 783         rxdr->next_to_use = 0;
 784
 785         return 0;
 786 }
 787
 788 /**
 789  * ixgb_setup_rctl - configure the receive control register
 790  * @adapter: Board private structure
 791  **/
 792
 793 static void
 794 ixgb_setup_rctl(struct ixgb_adapter *adapter)
 795 {
 796         u32 rctl;
 797
 798         rctl = IXGB_READ_REG(&adapter->hw, RCTL);
 799
 800         rctl &= ~(3 << IXGB_RCTL_MO_SHIFT);
 801
 802         rctl |=
 803                 IXGB_RCTL_BAM | IXGB_RCTL_RDMTS_1_2 |
 804                 IXGB_RCTL_RXEN | IXGB_RCTL_CFF |
 805                 (adapter->hw.mc_filter_type << IXGB_RCTL_MO_SHIFT);
 806
 807         rctl |= IXGB_RCTL_SECRC;
 808
 809         if (adapter->rx_buffer_len <= IXGB_RXBUFFER_2048)
 810                 rctl |= IXGB_RCTL_BSIZE_2048;
 811         else if (adapter->rx_buffer_len <= IXGB_RXBUFFER_4096)
 812                 rctl |= IXGB_RCTL_BSIZE_4096;
 813         else if (adapter->rx_buffer_len <= IXGB_RXBUFFER_8192)
 814                 rctl |= IXGB_RCTL_BSIZE_8192;
 815         else if (adapter->rx_buffer_len <= IXGB_RXBUFFER_16384)
 816                 rctl |= IXGB_RCTL_BSIZE_16384;
 817
 818         IXGB_WRITE_REG(&adapter->hw, RCTL, rctl);
 819 }
 820
 821 /**
 822  * ixgb_configure_rx - Configure 82597 Receive Unit after Reset.
 823  * @adapter: board private structure
 824  *
 825  * Configure the Rx unit of the MAC after a reset.
 826  **/
 827
 828 static void
 829 ixgb_configure_rx(struct ixgb_adapter *adapter)
 830 {
 831         u64 rdba = adapter->rx_ring.dma;
 832         u32 rdlen = adapter->rx_ring.count * sizeof(struct ixgb_rx_desc);
 833         struct ixgb_hw *hw = &adapter->hw;
 834         u32 rctl;
 835         u32 rxcsum;
 836
 837         /* make sure receives are disabled while setting up the descriptors */
 838
 839         rctl = IXGB_READ_REG(hw, RCTL);
 840         IXGB_WRITE_REG(hw, RCTL, rctl & ~IXGB_RCTL_RXEN);
 841
 842         /* set the Receive Delay Timer Register */
 843
 844         IXGB_WRITE_REG(hw, RDTR, adapter->rx_int_delay);
 845
 846         /* Setup the Base and Length of the Rx Descriptor Ring */
 847
 848         IXGB_WRITE_REG(hw, RDBAL, (rdba & 0x00000000ffffffffULL));
 849         IXGB_WRITE_REG(hw, RDBAH, (rdba >> 32));
 850
 851         IXGB_WRITE_REG(hw, RDLEN, rdlen);
 852
 853         /* Setup the HW Rx Head and Tail Descriptor Pointers */
 854         IXGB_WRITE_REG(hw, RDH, 0);
 855         IXGB_WRITE_REG(hw, RDT, 0);
 856
 857         /* due to the hardware errata with RXDCTL, we are unable to use any of
 858          * the performance enhancing features of it without causing other
 859          * subtle bugs, some of the bugs could include receive length
 860          * corruption at high data rates (WTHRESH > 0) and/or receive
 861          * descriptor ring irregularites (particularly in hardware cache) */
 862         IXGB_WRITE_REG(hw, RXDCTL, 0);
 863
 864         /* Enable Receive Checksum Offload for TCP and UDP */
 865         if (adapter->rx_csum) {
 866                 rxcsum = IXGB_READ_REG(hw, RXCSUM);
 867                 rxcsum |= IXGB_RXCSUM_TUOFL;
 868                 IXGB_WRITE_REG(hw, RXCSUM, rxcsum);
 869         }
 870
 871         /* Enable Receives */
 872
 873         IXGB_WRITE_REG(hw, RCTL, rctl);
 874 }
 875
 876 /**
 877  * ixgb_free_tx_resources - Free Tx Resources
 878  * @adapter: board private structure
 879  *
 880  * Free all transmit software resources
 881  **/
 882
 883 void
 884 ixgb_free_tx_resources(struct ixgb_adapter *adapter)
 885 {
 886         struct pci_dev *pdev = adapter->pdev;
 887
 888         ixgb_clean_tx_ring(adapter);
 889
 890         vfree(adapter->tx_ring.buffer_info);
 891         adapter->tx_ring.buffer_info = NULL;
 892
 893         pci_free_consistent(pdev, adapter->tx_ring.size,
 894                             adapter->tx_ring.desc, adapter->tx_ring.dma);
 895
 896         adapter->tx_ring.desc = NULL;
 897 }
 898
 899 static void
 900 ixgb_unmap_and_free_tx_resource(struct ixgb_adapter *adapter,
 901                                         struct ixgb_buffer *buffer_info)
 902 {
 903         struct pci_dev *pdev = adapter->pdev;
 904
 905         if (buffer_info->dma)
 906                 pci_unmap_page(pdev, buffer_info->dma, buffer_info->length,
 907                                PCI_DMA_TODEVICE);
 908
 909         if (buffer_info->skb)
 910                 dev_kfree_skb_any(buffer_info->skb);
 911
 912         buffer_info->skb = NULL;
 913         buffer_info->dma = 0;
 914         buffer_info->time_stamp = 0;
 915         /* these fields must always be initialized in tx
 916          * buffer_info->length = 0;
 917          * buffer_info->next_to_watch = 0; */
 918 }
 919
 920 /**
 921  * ixgb_clean_tx_ring - Free Tx Buffers
 922  * @adapter: board private structure
 923  **/
 924
 925 static void
 926 ixgb_clean_tx_ring(struct ixgb_adapter *adapter)
 927 {
 928         struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
 929         struct ixgb_buffer *buffer_info;
 930         unsigned long size;
 931         unsigned int i;
 932
 933         /* Free all the Tx ring sk_buffs */
 934
 935         for(i = 0; i < tx_ring->count; i++) {
 936                 buffer_info = &tx_ring->buffer_info[i];
 937                 ixgb_unmap_and_free_tx_resource(adapter, buffer_info);
 938         }
 939
 940         size = sizeof(struct ixgb_buffer) * tx_ring->count;
 941         memset(tx_ring->buffer_info, 0, size);
 942
 943         /* Zero out the descriptor ring */
 944
 945         memset(tx_ring->desc, 0, tx_ring->size);
 946
 947         tx_ring->next_to_use = 0;
 948         tx_ring->next_to_clean = 0;
 949
 950         IXGB_WRITE_REG(&adapter->hw, TDH, 0);
 951         IXGB_WRITE_REG(&adapter->hw, TDT, 0);
 952 }
 953
 954 /**
 955  * ixgb_free_rx_resources - Free Rx Resources
 956  * @adapter: board private structure
 957  *
 958  * Free all receive software resources
 959  **/
 960
 961 void
 962 ixgb_free_rx_resources(struct ixgb_adapter *adapter)
 963 {
 964         struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
 965         struct pci_dev *pdev = adapter->pdev;
 966
 967         ixgb_clean_rx_ring(adapter);
 968
 969         vfree(rx_ring->buffer_info);
 970         rx_ring->buffer_info = NULL;
 971
 972         pci_free_consistent(pdev, rx_ring->size, rx_ring->desc, rx_ring->dma);
 973
 974         rx_ring->desc = NULL;
 975 }
 976
 977 /**
 978  * ixgb_clean_rx_ring - Free Rx Buffers
 979  * @adapter: board private structure
 980  **/
 981
 982 static void
 983 ixgb_clean_rx_ring(struct ixgb_adapter *adapter)
 984 {
 985         struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
 986         struct ixgb_buffer *buffer_info;
 987         struct pci_dev *pdev = adapter->pdev;
 988         unsigned long size;
 989         unsigned int i;
 990
 991         /* Free all the Rx ring sk_buffs */
 992
 993         for(i = 0; i < rx_ring->count; i++) {
 994                 buffer_info = &rx_ring->buffer_info[i];
 995                 if(buffer_info->skb) {
 996
 997                         pci_unmap_single(pdev,
 998                                          buffer_info->dma,
 999                                          buffer_info->length,
1000                                          PCI_DMA_FROMDEVICE);
1001
1002                         dev_kfree_skb(buffer_info->skb);
1003
1004                         buffer_info->skb = NULL;
1005                 }
1006         }
1007
1008         size = sizeof(struct ixgb_buffer) * rx_ring->count;
1009         memset(rx_ring->buffer_info, 0, size);
1010
1011         /* Zero out the descriptor ring */
1012
1013         memset(rx_ring->desc, 0, rx_ring->size);
1014
1015         rx_ring->next_to_clean = 0;
1016         rx_ring->next_to_use = 0;
1017
1018         IXGB_WRITE_REG(&adapter->hw, RDH, 0);
1019         IXGB_WRITE_REG(&adapter->hw, RDT, 0);
1020 }
1021
1022 /**
1023  * ixgb_set_mac - Change the Ethernet Address of the NIC
1024  * @netdev: network interface device structure
1025  * @p: pointer to an address structure
1026  *
1027  * Returns 0 on success, negative on failure
1028  **/
1029
1030 static int
1031 ixgb_set_mac(struct net_device *netdev, void *p)
1032 {
1033         struct ixgb_adapter *adapter = netdev_priv(netdev);
1034         struct sockaddr *addr = p;
1035
1036         if(!is_valid_ether_addr(addr->sa_data))
1037                 return -EADDRNOTAVAIL;
1038
1039         memcpy(netdev->dev_addr, addr->sa_data, netdev->addr_len);
1040
1041         ixgb_rar_set(&adapter->hw, addr->sa_data, 0);
1042
1043         return 0;
1044 }
1045
1046 /**
1047  * ixgb_set_multi - Multicast and Promiscuous mode set
1048  * @netdev: network interface device structure
1049  *
1050  * The set_multi entry point is called whenever the multicast address
1051  * list or the network interface flags are updated.  This routine is
1052  * responsible for configuring the hardware for proper multicast,
1053  * promiscuous mode, and all-multi behavior.
1054  **/
1055
1056 static void
1057 ixgb_set_multi(struct net_device *netdev)
1058 {
1059         struct ixgb_adapter *adapter = netdev_priv(netdev);
1060         struct ixgb_hw *hw = &adapter->hw;
1061         struct dev_mc_list *mc_ptr;
1062         u32 rctl;
1063         int i;
1064
1065         /* Check for Promiscuous and All Multicast modes */
1066
1067         rctl = IXGB_READ_REG(hw, RCTL);
1068
1069         if(netdev->flags & IFF_PROMISC) {
1070                 rctl |= (IXGB_RCTL_UPE | IXGB_RCTL_MPE);
1071         } else if(netdev->flags & IFF_ALLMULTI) {
1072                 rctl |= IXGB_RCTL_MPE;
1073                 rctl &= ~IXGB_RCTL_UPE;
1074         } else {
1075                 rctl &= ~(IXGB_RCTL_UPE | IXGB_RCTL_MPE);
1076         }
1077
1078         if(netdev->mc_count > IXGB_MAX_NUM_MULTICAST_ADDRESSES) {
1079                 rctl |= IXGB_RCTL_MPE;
1080                 IXGB_WRITE_REG(hw, RCTL, rctl);
1081         } else {
1082                 u8 mta[IXGB_MAX_NUM_MULTICAST_ADDRESSES *
1083                             IXGB_ETH_LENGTH_OF_ADDRESS];
1084
1085                 IXGB_WRITE_REG(hw, RCTL, rctl);
1086
1087                 for(i = 0, mc_ptr = netdev->mc_list; mc_ptr;
1088                         i++, mc_ptr = mc_ptr->next)
1089                         memcpy(&mta[i * IXGB_ETH_LENGTH_OF_ADDRESS],
1090                                    mc_ptr->dmi_addr, IXGB_ETH_LENGTH_OF_ADDRESS);
1091
1092                 ixgb_mc_addr_list_update(hw, mta, netdev->mc_count, 0);
1093         }
1094 }
1095
1096 /**
1097  * ixgb_watchdog - Timer Call-back
1098  * @data: pointer to netdev cast into an unsigned long
1099  **/
1100
1101 static void
1102 ixgb_watchdog(unsigned long data)
1103 {
1104         struct ixgb_adapter *adapter = (struct ixgb_adapter *)data;
1105         struct net_device *netdev = adapter->netdev;
1106         struct ixgb_desc_ring *txdr = &adapter->tx_ring;
1107
1108         ixgb_check_for_link(&adapter->hw);
1109
1110         if (ixgb_check_for_bad_link(&adapter->hw)) {
1111                 /* force the reset path */
1112                 netif_stop_queue(netdev);
1113         }
1114
1115         if(adapter->hw.link_up) {
1116                 if(!netif_carrier_ok(netdev)) {
1117                         DPRINTK(LINK, INFO,
1118                                 "NIC Link is Up 10000 Mbps Full Duplex\n");
1119                         adapter->link_speed = 10000;
1120                         adapter->link_duplex = FULL_DUPLEX;
1121                         netif_carrier_on(netdev);
1122                         netif_wake_queue(netdev);
1123                 }
1124         } else {
1125                 if(netif_carrier_ok(netdev)) {
1126                         adapter->link_speed = 0;
1127                         adapter->link_duplex = 0;
1128                         DPRINTK(LINK, INFO, "NIC Link is Down\n");
1129                         netif_carrier_off(netdev);
1130                         netif_stop_queue(netdev);
1131
1132                 }
1133         }
1134
1135         ixgb_update_stats(adapter);
1136
1137         if(!netif_carrier_ok(netdev)) {
1138                 if(IXGB_DESC_UNUSED(txdr) + 1 < txdr->count) {
1139                         /* We've lost link, so the controller stops DMA,
1140                          * but we've got queued Tx work that's never going
1141                          * to get done, so reset controller to flush Tx.
1142                          * (Do the reset outside of interrupt context). */
1143                         schedule_work(&adapter->tx_timeout_task);
1144                 }
1145         }
1146
1147         /* Force detection of hung controller every watchdog period */
1148         adapter->detect_tx_hung = true;
1149
1150         /* generate an interrupt to force clean up of any stragglers */
1151         IXGB_WRITE_REG(&adapter->hw, ICS, IXGB_INT_TXDW);
1152
1153         /* Reset the timer */
1154         mod_timer(&adapter->watchdog_timer, jiffies + 2 * HZ);
1155 }
1156
1157 #define IXGB_TX_FLAGS_CSUM              0x00000001
1158 #define IXGB_TX_FLAGS_VLAN              0x00000002
1159 #define IXGB_TX_FLAGS_TSO               0x00000004
1160
1161 static int
1162 ixgb_tso(struct ixgb_adapter *adapter, struct sk_buff *skb)
1163 {
1164         struct ixgb_context_desc *context_desc;
1165         unsigned int i;
1166         u8 ipcss, ipcso, tucss, tucso, hdr_len;
1167         u16 ipcse, tucse, mss;
1168         int err;
1169
1170         if (likely(skb_is_gso(skb))) {
1171                 struct ixgb_buffer *buffer_info;
1172                 struct iphdr *iph;
1173
1174                 if (skb_header_cloned(skb)) {
1175                         err = pskb_expand_head(skb, 0, 0, GFP_ATOMIC);
1176                         if (err)
1177                                 return err;
1178                 }
1179
1180                 hdr_len = skb_transport_offset(skb) + tcp_hdrlen(skb);
1181                 mss = skb_shinfo(skb)->gso_size;
1182                 iph = ip_hdr(skb);
1183                 iph->tot_len = 0;
1184                 iph->check = 0;
1185                 tcp_hdr(skb)->check = ~csum_tcpudp_magic(iph->saddr,
1186                                                          iph->daddr, 0,
1187                                                          IPPROTO_TCP, 0);
1188                 ipcss = skb_network_offset(skb);
1189                 ipcso = (void *)&(iph->check) - (void *)skb->data;
1190                 ipcse = skb_transport_offset(skb) - 1;
1191                 tucss = skb_transport_offset(skb);
1192                 tucso = (void *)&(tcp_hdr(skb)->check) - (void *)skb->data;
1193                 tucse = 0;
1194
1195                 i = adapter->tx_ring.next_to_use;
1196                 context_desc = IXGB_CONTEXT_DESC(adapter->tx_ring, i);
1197                 buffer_info = &adapter->tx_ring.buffer_info[i];
1198                 WARN_ON(buffer_info->dma != 0);
1199
1200                 context_desc->ipcss = ipcss;
1201                 context_desc->ipcso = ipcso;
1202                 context_desc->ipcse = cpu_to_le16(ipcse);
1203                 context_desc->tucss = tucss;
1204                 context_desc->tucso = tucso;
1205                 context_desc->tucse = cpu_to_le16(tucse);
1206                 context_desc->mss = cpu_to_le16(mss);
1207                 context_desc->hdr_len = hdr_len;
1208                 context_desc->status = 0;
1209                 context_desc->cmd_type_len = cpu_to_le32(
1210                                                   IXGB_CONTEXT_DESC_TYPE
1211                                                 | IXGB_CONTEXT_DESC_CMD_TSE
1212                                                 | IXGB_CONTEXT_DESC_CMD_IP
1213                                                 | IXGB_CONTEXT_DESC_CMD_TCP
1214                                                 | IXGB_CONTEXT_DESC_CMD_IDE
1215                                                 | (skb->len - (hdr_len)));
1216
1217
1218                 if(++i == adapter->tx_ring.count) i = 0;
1219                 adapter->tx_ring.next_to_use = i;
1220
1221                 return 1;
1222         }
1223
1224         return 0;
1225 }
1226
1227 static bool
1228 ixgb_tx_csum(struct ixgb_adapter *adapter, struct sk_buff *skb)
1229 {
1230         struct ixgb_context_desc *context_desc;
1231         unsigned int i;
1232         u8 css, cso;
1233
1234         if(likely(skb->ip_summed == CHECKSUM_PARTIAL)) {
1235                 struct ixgb_buffer *buffer_info;
1236                 css = skb_transport_offset(skb);
1237                 cso = css + skb->csum_offset;
1238
1239                 i = adapter->tx_ring.next_to_use;
1240                 context_desc = IXGB_CONTEXT_DESC(adapter->tx_ring, i);
1241                 buffer_info = &adapter->tx_ring.buffer_info[i];
1242                 WARN_ON(buffer_info->dma != 0);
1243
1244                 context_desc->tucss = css;
1245                 context_desc->tucso = cso;
1246                 context_desc->tucse = 0;
1247                 /* zero out any previously existing data in one instruction */
1248                 *(u32 *)&(context_desc->ipcss) = 0;
1249                 context_desc->status = 0;
1250                 context_desc->hdr_len = 0;
1251                 context_desc->mss = 0;
1252                 context_desc->cmd_type_len =
1253                         cpu_to_le32(IXGB_CONTEXT_DESC_TYPE
1254                                     | IXGB_TX_DESC_CMD_IDE);
1255
1256                 if(++i == adapter->tx_ring.count) i = 0;
1257                 adapter->tx_ring.next_to_use = i;
1258
1259                 return true;
1260         }
1261
1262         return false;
1263 }
1264
1265 #define IXGB_MAX_TXD_PWR        14
1266 #define IXGB_MAX_DATA_PER_TXD   (1<<IXGB_MAX_TXD_PWR)
1267
1268 static int
1269 ixgb_tx_map(struct ixgb_adapter *adapter, struct sk_buff *skb,
1270             unsigned int first)
1271 {
1272         struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
1273         struct ixgb_buffer *buffer_info;
1274         int len = skb->len;
1275         unsigned int offset = 0, size, count = 0, i;
1276         unsigned int mss = skb_shinfo(skb)->gso_size;
1277
1278         unsigned int nr_frags = skb_shinfo(skb)->nr_frags;
1279         unsigned int f;
1280
1281         len -= skb->data_len;
1282
1283         i = tx_ring->next_to_use;
1284
1285         while(len) {
1286                 buffer_info = &tx_ring->buffer_info[i];
1287                 size = min(len, IXGB_MAX_DATA_PER_TXD);
1288                 /* Workaround for premature desc write-backs
1289                  * in TSO mode.  Append 4-byte sentinel desc */
1290                 if (unlikely(mss && !nr_frags && size == len && size > 8))
1291                         size -= 4;
1292
1293                 buffer_info->length = size;
1294                 WARN_ON(buffer_info->dma != 0);
1295                 buffer_info->time_stamp = jiffies;
1296                 buffer_info->dma =
1297                         pci_map_single(adapter->pdev,
1298                                 skb->data + offset,
1299                                 size,
1300                                 PCI_DMA_TODEVICE);
1301                 buffer_info->next_to_watch = 0;
1302
1303                 len -= size;
1304                 offset += size;
1305                 count++;
1306                 if(++i == tx_ring->count) i = 0;
1307         }
1308
1309         for(f = 0; f < nr_frags; f++) {
1310                 struct skb_frag_struct *frag;
1311
1312                 frag = &skb_shinfo(skb)->frags[f];
1313                 len = frag->size;
1314                 offset = 0;
1315
1316                 while(len) {
1317                         buffer_info = &tx_ring->buffer_info[i];
1318                         size = min(len, IXGB_MAX_DATA_PER_TXD);
1319
1320                         /* Workaround for premature desc write-backs
1321                          * in TSO mode.  Append 4-byte sentinel desc */
1322                         if (unlikely(mss && (f == (nr_frags - 1))
1323                                      && size == len && size > 8))
1324                                 size -= 4;
1325
1326                         buffer_info->length = size;
1327                         buffer_info->time_stamp = jiffies;
1328                         buffer_info->dma =
1329                                 pci_map_page(adapter->pdev,
1330                                         frag->page,
1331                                         frag->page_offset + offset,
1332                                         size,
1333                                         PCI_DMA_TODEVICE);
1334                         buffer_info->next_to_watch = 0;
1335
1336                         len -= size;
1337                         offset += size;
1338                         count++;
1339                         if(++i == tx_ring->count) i = 0;
1340                 }
1341         }
1342         i = (i == 0) ? tx_ring->count - 1 : i - 1;
1343         tx_ring->buffer_info[i].skb = skb;
1344         tx_ring->buffer_info[first].next_to_watch = i;
1345
1346         return count;
1347 }
1348
1349 static void
1350 ixgb_tx_queue(struct ixgb_adapter *adapter, int count, int vlan_id,int tx_flags)
1351 {
1352         struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
1353         struct ixgb_tx_desc *tx_desc = NULL;
1354         struct ixgb_buffer *buffer_info;
1355         u32 cmd_type_len = adapter->tx_cmd_type;
1356         u8 status = 0;
1357         u8 popts = 0;
1358         unsigned int i;
1359
1360         if(tx_flags & IXGB_TX_FLAGS_TSO) {
1361                 cmd_type_len |= IXGB_TX_DESC_CMD_TSE;
1362                 popts |= (IXGB_TX_DESC_POPTS_IXSM | IXGB_TX_DESC_POPTS_TXSM);
1363         }
1364
1365         if(tx_flags & IXGB_TX_FLAGS_CSUM)
1366                 popts |= IXGB_TX_DESC_POPTS_TXSM;
1367
1368         if(tx_flags & IXGB_TX_FLAGS_VLAN) {
1369                 cmd_type_len |= IXGB_TX_DESC_CMD_VLE;
1370         }
1371
1372         i = tx_ring->next_to_use;
1373
1374         while(count--) {
1375                 buffer_info = &tx_ring->buffer_info[i];
1376                 tx_desc = IXGB_TX_DESC(*tx_ring, i);
1377                 tx_desc->buff_addr = cpu_to_le64(buffer_info->dma);
1378                 tx_desc->cmd_type_len =
1379                         cpu_to_le32(cmd_type_len | buffer_info->length);
1380                 tx_desc->status = status;
1381                 tx_desc->popts = popts;
1382                 tx_desc->vlan = cpu_to_le16(vlan_id);
1383
1384                 if(++i == tx_ring->count) i = 0;
1385         }
1386
1387         tx_desc->cmd_type_len |= cpu_to_le32(IXGB_TX_DESC_CMD_EOP
1388                                 | IXGB_TX_DESC_CMD_RS );
1389
1390         /* Force memory writes to complete before letting h/w
1391          * know there are new descriptors to fetch.  (Only
1392          * applicable for weak-ordered memory model archs,
1393          * such as IA-64). */
1394         wmb();
1395
1396         tx_ring->next_to_use = i;
1397         IXGB_WRITE_REG(&adapter->hw, TDT, i);
1398 }
1399
1400 static int __ixgb_maybe_stop_tx(struct net_device *netdev, int size)
1401 {
1402         struct ixgb_adapter *adapter = netdev_priv(netdev);
1403         struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
1404
1405         netif_stop_queue(netdev);
1406         /* Herbert's original patch had:
1407          *  smp_mb__after_netif_stop_queue();
1408          * but since that doesn't exist yet, just open code it. */
1409         smp_mb();
1410
1411         /* We need to check again in a case another CPU has just
1412          * made room available. */
1413         if (likely(IXGB_DESC_UNUSED(tx_ring) < size))
1414                 return -EBUSY;
1415
1416         /* A reprieve! */
1417         netif_start_queue(netdev);
1418         ++adapter->restart_queue;
1419         return 0;
1420 }
1421
1422 static int ixgb_maybe_stop_tx(struct net_device *netdev,
1423                               struct ixgb_desc_ring *tx_ring, int size)
1424 {
1425         if (likely(IXGB_DESC_UNUSED(tx_ring) >= size))
1426                 return 0;
1427         return __ixgb_maybe_stop_tx(netdev, size);
1428 }
1429
1430
1431 /* Tx Descriptors needed, worst case */
1432 #define TXD_USE_COUNT(S) (((S) >> IXGB_MAX_TXD_PWR) + \
1433                          (((S) & (IXGB_MAX_DATA_PER_TXD - 1)) ? 1 : 0))
1434 #define DESC_NEEDED TXD_USE_COUNT(IXGB_MAX_DATA_PER_TXD) /* skb->date */ + \
1435         MAX_SKB_FRAGS * TXD_USE_COUNT(PAGE_SIZE) + 1 /* for context */ \
1436         + 1 /* one more needed for sentinel TSO workaround */
1437
1438 static int
1439 ixgb_xmit_frame(struct sk_buff *skb, struct net_device *netdev)
1440 {
1441         struct ixgb_adapter *adapter = netdev_priv(netdev);
1442         unsigned int first;
1443         unsigned int tx_flags = 0;
1444         unsigned long flags;
1445         int vlan_id = 0;
1446         int tso;
1447
1448         if (test_bit(__IXGB_DOWN, &adapter->flags)) {
1449                 dev_kfree_skb(skb);
1450                 return NETDEV_TX_OK;
1451         }
1452
1453         if(skb->len <= 0) {
1454                 dev_kfree_skb_any(skb);
1455                 return 0;
1456         }
1457
1458 #ifdef NETIF_F_LLTX
1459         if (!spin_trylock_irqsave(&adapter->tx_lock, flags)) {
1460                 /* Collision - tell upper layer to requeue */
1461                 local_irq_restore(flags);
1462                 return NETDEV_TX_LOCKED;
1463         }
1464 #else
1465         spin_lock_irqsave(&adapter->tx_lock, flags);
1466 #endif
1467
1468         if (unlikely(ixgb_maybe_stop_tx(netdev, &adapter->tx_ring,
1469                      DESC_NEEDED))) {
1470                 netif_stop_queue(netdev);
1471                 spin_unlock_irqrestore(&adapter->tx_lock, flags);
1472                 return NETDEV_TX_BUSY;
1473         }
1474
1475 #ifndef NETIF_F_LLTX
1476         spin_unlock_irqrestore(&adapter->tx_lock, flags);
1477 #endif
1478
1479         if(adapter->vlgrp && vlan_tx_tag_present(skb)) {
1480                 tx_flags |= IXGB_TX_FLAGS_VLAN;
1481                 vlan_id = vlan_tx_tag_get(skb);
1482         }
1483
1484         first = adapter->tx_ring.next_to_use;
1485
1486         tso = ixgb_tso(adapter, skb);
1487         if (tso < 0) {
1488                 dev_kfree_skb_any(skb);
1489 #ifdef NETIF_F_LLTX
1490                 spin_unlock_irqrestore(&adapter->tx_lock, flags);
1491 #endif
1492                 return NETDEV_TX_OK;
1493         }
1494
1495         if (likely(tso))
1496                 tx_flags |= IXGB_TX_FLAGS_TSO;
1497         else if(ixgb_tx_csum(adapter, skb))
1498                 tx_flags |= IXGB_TX_FLAGS_CSUM;
1499
1500         ixgb_tx_queue(adapter, ixgb_tx_map(adapter, skb, first), vlan_id,
1501                         tx_flags);
1502
1503         netdev->trans_start = jiffies;
1504
1505 #ifdef NETIF_F_LLTX
1506         /* Make sure there is space in the ring for the next send. */
1507         ixgb_maybe_stop_tx(netdev, &adapter->tx_ring, DESC_NEEDED);
1508
1509         spin_unlock_irqrestore(&adapter->tx_lock, flags);
1510
1511 #endif
1512         return NETDEV_TX_OK;
1513 }
1514
1515 /**
1516  * ixgb_tx_timeout - Respond to a Tx Hang
1517  * @netdev: network interface device structure
1518  **/
1519
1520 static void
1521 ixgb_tx_timeout(struct net_device *netdev)
1522 {
1523         struct ixgb_adapter *adapter = netdev_priv(netdev);
1524
1525         /* Do the reset outside of interrupt context */
1526         schedule_work(&adapter->tx_timeout_task);
1527 }
1528
1529 static void
1530 ixgb_tx_timeout_task(struct work_struct *work)
1531 {
1532         struct ixgb_adapter *adapter =
1533                 container_of(work, struct ixgb_adapter, tx_timeout_task);
1534
1535         adapter->tx_timeout_count++;
1536         ixgb_down(adapter, true);
1537         ixgb_up(adapter);
1538 }
1539
1540 /**
1541  * ixgb_get_stats - Get System Network Statistics
1542  * @netdev: network interface device structure
1543  *
1544  * Returns the address of the device statistics structure.
1545  * The statistics are actually updated from the timer callback.
1546  **/
1547
1548 static struct net_device_stats *
1549 ixgb_get_stats(struct net_device *netdev)
1550 {
1551         struct ixgb_adapter *adapter = netdev_priv(netdev);
1552
1553         return &adapter->net_stats;
1554 }
1555
1556 /**
1557  * ixgb_change_mtu - Change the Maximum Transfer Unit
1558  * @netdev: network interface device structure
1559  * @new_mtu: new value for maximum frame size
1560  *
1561  * Returns 0 on success, negative on failure
1562  **/
1563
1564 static int
1565 ixgb_change_mtu(struct net_device *netdev, int new_mtu)
1566 {
1567         struct ixgb_adapter *adapter = netdev_priv(netdev);
1568         int max_frame = new_mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;
1569         int old_max_frame = netdev->mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;
1570
1571         /* MTU < 68 is an error for IPv4 traffic, just don't allow it */
1572         if ((new_mtu < 68) ||
1573             (max_frame > IXGB_MAX_JUMBO_FRAME_SIZE + ENET_FCS_LENGTH)) {
1574                 DPRINTK(PROBE, ERR, "Invalid MTU setting %d\n", new_mtu);
1575                 return -EINVAL;
1576         }
1577
1578         if (old_max_frame == max_frame)
1579                 return 0;
1580
1581         if (netif_running(netdev))
1582                 ixgb_down(adapter, true);
1583
1584         adapter->rx_buffer_len = max_frame + 8; /* + 8 for errata */
1585
1586         netdev->mtu = new_mtu;
1587
1588         if (netif_running(netdev))
1589                 ixgb_up(adapter);
1590
1591         return 0;
1592 }
1593
1594 /**
1595  * ixgb_update_stats - Update the board statistics counters.
1596  * @adapter: board private structure
1597  **/
1598
1599 void
1600 ixgb_update_stats(struct ixgb_adapter *adapter)
1601 {
1602         struct net_device *netdev = adapter->netdev;
1603         struct pci_dev *pdev = adapter->pdev;
1604
1605         /* Prevent stats update while adapter is being reset */
1606         if (pci_channel_offline(pdev))
1607                 return;
1608
1609         if((netdev->flags & IFF_PROMISC) || (netdev->flags & IFF_ALLMULTI) ||
1610            (netdev->mc_count > IXGB_MAX_NUM_MULTICAST_ADDRESSES)) {
1611                 u64 multi = IXGB_READ_REG(&adapter->hw, MPRCL);
1612                 u32 bcast_l = IXGB_READ_REG(&adapter->hw, BPRCL);
1613                 u32 bcast_h = IXGB_READ_REG(&adapter->hw, BPRCH);
1614                 u64 bcast = ((u64)bcast_h << 32) | bcast_l;
1615
1616                 multi |= ((u64)IXGB_READ_REG(&adapter->hw, MPRCH) << 32);
1617                 /* fix up multicast stats by removing broadcasts */
1618                 if(multi >= bcast)
1619                         multi -= bcast;
1620
1621                 adapter->stats.mprcl += (multi & 0xFFFFFFFF);
1622                 adapter->stats.mprch += (multi >> 32);
1623                 adapter->stats.bprcl += bcast_l;
1624                 adapter->stats.bprch += bcast_h;
1625         } else {
1626                 adapter->stats.mprcl += IXGB_READ_REG(&adapter->hw, MPRCL);
1627                 adapter->stats.mprch += IXGB_READ_REG(&adapter->hw, MPRCH);
1628                 adapter->stats.bprcl += IXGB_READ_REG(&adapter->hw, BPRCL);
1629                 adapter->stats.bprch += IXGB_READ_REG(&adapter->hw, BPRCH);
1630         }
1631         adapter->stats.tprl += IXGB_READ_REG(&adapter->hw, TPRL);
1632         adapter->stats.tprh += IXGB_READ_REG(&adapter->hw, TPRH);
1633         adapter->stats.gprcl += IXGB_READ_REG(&adapter->hw, GPRCL);
1634         adapter->stats.gprch += IXGB_READ_REG(&adapter->hw, GPRCH);
1635         adapter->stats.uprcl += IXGB_READ_REG(&adapter->hw, UPRCL);
1636         adapter->stats.uprch += IXGB_READ_REG(&adapter->hw, UPRCH);
1637         adapter->stats.vprcl += IXGB_READ_REG(&adapter->hw, VPRCL);
1638         adapter->stats.vprch += IXGB_READ_REG(&adapter->hw, VPRCH);
1639         adapter->stats.jprcl += IXGB_READ_REG(&adapter->hw, JPRCL);
1640         adapter->stats.jprch += IXGB_READ_REG(&adapter->hw, JPRCH);
1641         adapter->stats.gorcl += IXGB_READ_REG(&adapter->hw, GORCL);
1642         adapter->stats.gorch += IXGB_READ_REG(&adapter->hw, GORCH);
1643         adapter->stats.torl += IXGB_READ_REG(&adapter->hw, TORL);
1644         adapter->stats.torh += IXGB_READ_REG(&adapter->hw, TORH);
1645         adapter->stats.rnbc += IXGB_READ_REG(&adapter->hw, RNBC);
1646         adapter->stats.ruc += IXGB_READ_REG(&adapter->hw, RUC);
1647         adapter->stats.roc += IXGB_READ_REG(&adapter->hw, ROC);
1648         adapter->stats.rlec += IXGB_READ_REG(&adapter->hw, RLEC);
1649         adapter->stats.crcerrs += IXGB_READ_REG(&adapter->hw, CRCERRS);
1650         adapter->stats.icbc += IXGB_READ_REG(&adapter->hw, ICBC);
1651         adapter->stats.ecbc += IXGB_READ_REG(&adapter->hw, ECBC);
1652         adapter->stats.mpc += IXGB_READ_REG(&adapter->hw, MPC);
1653         adapter->stats.tptl += IXGB_READ_REG(&adapter->hw, TPTL);
1654         adapter->stats.tpth += IXGB_READ_REG(&adapter->hw, TPTH);
1655         adapter->stats.gptcl += IXGB_READ_REG(&adapter->hw, GPTCL);
1656         adapter->stats.gptch += IXGB_READ_REG(&adapter->hw, GPTCH);
1657         adapter->stats.bptcl += IXGB_READ_REG(&adapter->hw, BPTCL);
1658         adapter->stats.bptch += IXGB_READ_REG(&adapter->hw, BPTCH);
1659         adapter->stats.mptcl += IXGB_READ_REG(&adapter->hw, MPTCL);
1660         adapter->stats.mptch += IXGB_READ_REG(&adapter->hw, MPTCH);
1661         adapter->stats.uptcl += IXGB_READ_REG(&adapter->hw, UPTCL);
1662         adapter->stats.uptch += IXGB_READ_REG(&adapter->hw, UPTCH);
1663         adapter->stats.vptcl += IXGB_READ_REG(&adapter->hw, VPTCL);
1664         adapter->stats.vptch += IXGB_READ_REG(&adapter->hw, VPTCH);
1665         adapter->stats.jptcl += IXGB_READ_REG(&adapter->hw, JPTCL);
1666         adapter->stats.jptch += IXGB_READ_REG(&adapter->hw, JPTCH);
1667         adapter->stats.gotcl += IXGB_READ_REG(&adapter->hw, GOTCL);
1668         adapter->stats.gotch += IXGB_READ_REG(&adapter->hw, GOTCH);
1669         adapter->stats.totl += IXGB_READ_REG(&adapter->hw, TOTL);
1670         adapter->stats.toth += IXGB_READ_REG(&adapter->hw, TOTH);
1671         adapter->stats.dc += IXGB_READ_REG(&adapter->hw, DC);
1672         adapter->stats.plt64c += IXGB_READ_REG(&adapter->hw, PLT64C);
1673         adapter->stats.tsctc += IXGB_READ_REG(&adapter->hw, TSCTC);
1674         adapter->stats.tsctfc += IXGB_READ_REG(&adapter->hw, TSCTFC);
1675         adapter->stats.ibic += IXGB_READ_REG(&adapter->hw, IBIC);
1676         adapter->stats.rfc += IXGB_READ_REG(&adapter->hw, RFC);
1677         adapter->stats.lfc += IXGB_READ_REG(&adapter->hw, LFC);
1678         adapter->stats.pfrc += IXGB_READ_REG(&adapter->hw, PFRC);
1679         adapter->stats.pftc += IXGB_READ_REG(&adapter->hw, PFTC);
1680         adapter->stats.mcfrc += IXGB_READ_REG(&adapter->hw, MCFRC);
1681         adapter->stats.mcftc += IXGB_READ_REG(&adapter->hw, MCFTC);
1682         adapter->stats.xonrxc += IXGB_READ_REG(&adapter->hw, XONRXC);
1683         adapter->stats.xontxc += IXGB_READ_REG(&adapter->hw, XONTXC);
1684         adapter->stats.xoffrxc += IXGB_READ_REG(&adapter->hw, XOFFRXC);
1685         adapter->stats.xofftxc += IXGB_READ_REG(&adapter->hw, XOFFTXC);
1686         adapter->stats.rjc += IXGB_READ_REG(&adapter->hw, RJC);
1687
1688         /* Fill out the OS statistics structure */
1689
1690         adapter->net_stats.rx_packets = adapter->stats.gprcl;
1691         adapter->net_stats.tx_packets = adapter->stats.gptcl;
1692         adapter->net_stats.rx_bytes = adapter->stats.gorcl;
1693         adapter->net_stats.tx_bytes = adapter->stats.gotcl;
1694         adapter->net_stats.multicast = adapter->stats.mprcl;
1695         adapter->net_stats.collisions = 0;
1696
1697         /* ignore RLEC as it reports errors for padded (<64bytes) frames
1698          * with a length in the type/len field */
1699         adapter->net_stats.rx_errors =
1700             /* adapter->stats.rnbc + */ adapter->stats.crcerrs +
1701             adapter->stats.ruc +
1702             adapter->stats.roc /*+ adapter->stats.rlec */  +
1703             adapter->stats.icbc +
1704             adapter->stats.ecbc + adapter->stats.mpc;
1705
1706         /* see above
1707          * adapter->net_stats.rx_length_errors = adapter->stats.rlec;
1708          */
1709
1710         adapter->net_stats.rx_crc_errors = adapter->stats.crcerrs;
1711         adapter->net_stats.rx_fifo_errors = adapter->stats.mpc;
1712         adapter->net_stats.rx_missed_errors = adapter->stats.mpc;
1713         adapter->net_stats.rx_over_errors = adapter->stats.mpc;
1714
1715         adapter->net_stats.tx_errors = 0;
1716         adapter->net_stats.rx_frame_errors = 0;
1717         adapter->net_stats.tx_aborted_errors = 0;
1718         adapter->net_stats.tx_carrier_errors = 0;
1719         adapter->net_stats.tx_fifo_errors = 0;
1720         adapter->net_stats.tx_heartbeat_errors = 0;
1721         adapter->net_stats.tx_window_errors = 0;
1722 }
1723
1724 #define IXGB_MAX_INTR 10
1725 /**
1726  * ixgb_intr - Interrupt Handler
1727  * @irq: interrupt number
1728  * @data: pointer to a network interface device structure
1729  **/
1730
1731 static irqreturn_t
1732 ixgb_intr(int irq, void *data)
1733 {
1734         struct net_device *netdev = data;
1735         struct ixgb_adapter *adapter = netdev_priv(netdev);
1736         struct ixgb_hw *hw = &adapter->hw;
1737         u32 icr = IXGB_READ_REG(hw, ICR);
1738 #ifndef CONFIG_IXGB_NAPI
1739         unsigned int i;
1740 #endif
1741
1742         if(unlikely(!icr))
1743                 return IRQ_NONE;  /* Not our interrupt */
1744
1745         if (unlikely(icr & (IXGB_INT_RXSEQ | IXGB_INT_LSC)))
1746                 if (!test_bit(__IXGB_DOWN, &adapter->flags))
1747                         mod_timer(&adapter->watchdog_timer, jiffies);
1748
1749 #ifdef CONFIG_IXGB_NAPI
1750         if (netif_rx_schedule_prep(netdev, &adapter->napi)) {
1751
1752                 /* Disable interrupts and register for poll. The flush
1753                   of the posted write is intentionally left out.
1754                 */
1755
1756                 IXGB_WRITE_REG(&adapter->hw, IMC, ~0);
1757                 __netif_rx_schedule(netdev, &adapter->napi);
1758         }
1759 #else
1760         /* yes, that is actually a & and it is meant to make sure that
1761          * every pass through this for loop checks both receive and
1762          * transmit queues for completed descriptors, intended to
1763          * avoid starvation issues and assist tx/rx fairness. */
1764         for(i = 0; i < IXGB_MAX_INTR; i++)
1765                 if(!ixgb_clean_rx_irq(adapter) &
1766                    !ixgb_clean_tx_irq(adapter))
1767                         break;
1768 #endif
1769         return IRQ_HANDLED;
1770 }
1771
1772 #ifdef CONFIG_IXGB_NAPI
1773 /**
1774  * ixgb_clean - NAPI Rx polling callback
1775  * @adapter: board private structure
1776  **/
1777
1778 static int
1779 ixgb_clean(struct napi_struct *napi, int budget)
1780 {
1781         struct ixgb_adapter *adapter = container_of(napi, struct ixgb_adapter, napi);
1782         struct net_device *netdev = adapter->netdev;
1783         int work_done = 0;
1784
1785         ixgb_clean_tx_irq(adapter);
1786         ixgb_clean_rx_irq(adapter, &work_done, budget);
1787
1788         /* If budget not fully consumed, exit the polling mode */
1789         if (work_done < budget) {
1790                 netif_rx_complete(netdev, napi);
1791                 if (!test_bit(__IXGB_DOWN, &adapter->flags))
1792                         ixgb_irq_enable(adapter);
1793         }
1794
1795         return work_done;
1796 }
1797 #endif
1798
1799 /**
1800  * ixgb_clean_tx_irq - Reclaim resources after transmit completes
1801  * @adapter: board private structure
1802  **/
1803
1804 static bool
1805 ixgb_clean_tx_irq(struct ixgb_adapter *adapter)
1806 {
1807         struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
1808         struct net_device *netdev = adapter->netdev;
1809         struct ixgb_tx_desc *tx_desc, *eop_desc;
1810         struct ixgb_buffer *buffer_info;
1811         unsigned int i, eop;
1812         bool cleaned = false;
1813
1814         i = tx_ring->next_to_clean;
1815         eop = tx_ring->buffer_info[i].next_to_watch;
1816         eop_desc = IXGB_TX_DESC(*tx_ring, eop);
1817
1818         while(eop_desc->status & IXGB_TX_DESC_STATUS_DD) {
1819
1820                 for (cleaned = false; !cleaned; ) {
1821                         tx_desc = IXGB_TX_DESC(*tx_ring, i);
1822                         buffer_info = &tx_ring->buffer_info[i];
1823
1824                         if (tx_desc->popts
1825                             & (IXGB_TX_DESC_POPTS_TXSM |
1826                                IXGB_TX_DESC_POPTS_IXSM))
1827                                 adapter->hw_csum_tx_good++;
1828
1829                         ixgb_unmap_and_free_tx_resource(adapter, buffer_info);
1830
1831                         *(u32 *)&(tx_desc->status) = 0;
1832
1833                         cleaned = (i == eop);
1834                         if(++i == tx_ring->count) i = 0;
1835                 }
1836
1837                 eop = tx_ring->buffer_info[i].next_to_watch;
1838                 eop_desc = IXGB_TX_DESC(*tx_ring, eop);
1839         }
1840
1841         tx_ring->next_to_clean = i;
1842
1843         if (unlikely(cleaned && netif_carrier_ok(netdev) &&
1844                      IXGB_DESC_UNUSED(tx_ring) >= DESC_NEEDED)) {
1845                 /* Make sure that anybody stopping the queue after this
1846                  * sees the new next_to_clean. */
1847                 smp_mb();
1848
1849                 if (netif_queue_stopped(netdev) &&
1850                     !(test_bit(__IXGB_DOWN, &adapter->flags))) {
1851                         netif_wake_queue(netdev);
1852                         ++adapter->restart_queue;
1853                 }
1854         }
1855
1856         if(adapter->detect_tx_hung) {
1857                 /* detect a transmit hang in hardware, this serializes the
1858                  * check with the clearing of time_stamp and movement of i */
1859                 adapter->detect_tx_hung = false;
1860                 if (tx_ring->buffer_info[eop].dma &&
1861                    time_after(jiffies, tx_ring->buffer_info[eop].time_stamp + HZ)
1862                    && !(IXGB_READ_REG(&adapter->hw, STATUS) &
1863                         IXGB_STATUS_TXOFF)) {
1864                         /* detected Tx unit hang */
1865                         DPRINTK(DRV, ERR, "Detected Tx Unit Hang\n"
1866                                         "  TDH                  <%x>\n"
1867                                         "  TDT                  <%x>\n"
1868                                         "  next_to_use          <%x>\n"
1869                                         "  next_to_clean        <%x>\n"
1870                                         "buffer_info[next_to_clean]\n"
1871                                         "  time_stamp           <%lx>\n"
1872                                         "  next_to_watch        <%x>\n"
1873                                         "  jiffies              <%lx>\n"
1874                                         "  next_to_watch.status <%x>\n",
1875                                 IXGB_READ_REG(&adapter->hw, TDH),
1876                                 IXGB_READ_REG(&adapter->hw, TDT),
1877                                 tx_ring->next_to_use,
1878                                 tx_ring->next_to_clean,
1879                                 tx_ring->buffer_info[eop].time_stamp,
1880                                 eop,
1881                                 jiffies,
1882                                 eop_desc->status);
1883                         netif_stop_queue(netdev);
1884                 }
1885         }
1886
1887         return cleaned;
1888 }
1889
1890 /**
1891  * ixgb_rx_checksum - Receive Checksum Offload for 82597.
1892  * @adapter: board private structure
1893  * @rx_desc: receive descriptor
1894  * @sk_buff: socket buffer with received data
1895  **/
1896
1897 static void
1898 ixgb_rx_checksum(struct ixgb_adapter *adapter,
1899                  struct ixgb_rx_desc *rx_desc,
1900                  struct sk_buff *skb)
1901 {
1902         /* Ignore Checksum bit is set OR
1903          * TCP Checksum has not been calculated
1904          */
1905         if((rx_desc->status & IXGB_RX_DESC_STATUS_IXSM) ||
1906            (!(rx_desc->status & IXGB_RX_DESC_STATUS_TCPCS))) {
1907                 skb->ip_summed = CHECKSUM_NONE;
1908                 return;
1909         }
1910
1911         /* At this point we know the hardware did the TCP checksum */
1912         /* now look at the TCP checksum error bit */
1913         if(rx_desc->errors & IXGB_RX_DESC_ERRORS_TCPE) {
1914                 /* let the stack verify checksum errors */
1915                 skb->ip_summed = CHECKSUM_NONE;
1916                 adapter->hw_csum_rx_error++;
1917         } else {
1918                 /* TCP checksum is good */
1919                 skb->ip_summed = CHECKSUM_UNNECESSARY;
1920                 adapter->hw_csum_rx_good++;
1921         }
1922 }
1923
1924 /**
1925  * ixgb_clean_rx_irq - Send received data up the network stack,
1926  * @adapter: board private structure
1927  **/
1928
1929 static bool
1930 #ifdef CONFIG_IXGB_NAPI
1931 ixgb_clean_rx_irq(struct ixgb_adapter *adapter, int *work_done, int work_to_do)
1932 #else
1933 ixgb_clean_rx_irq(struct ixgb_adapter *adapter)
1934 #endif
1935 {
1936         struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
1937         struct net_device *netdev = adapter->netdev;
1938         struct pci_dev *pdev = adapter->pdev;
1939         struct ixgb_rx_desc *rx_desc, *next_rxd;
1940         struct ixgb_buffer *buffer_info, *next_buffer, *next2_buffer;
1941         u32 length;
1942         unsigned int i, j;
1943         bool cleaned = false;
1944
1945         i = rx_ring->next_to_clean;
1946         rx_desc = IXGB_RX_DESC(*rx_ring, i);
1947         buffer_info = &rx_ring->buffer_info[i];
1948
1949         while(rx_desc->status & IXGB_RX_DESC_STATUS_DD) {
1950                 struct sk_buff *skb, *next_skb;
1951                 u8 status;
1952
1953 #ifdef CONFIG_IXGB_NAPI
1954                 if(*work_done >= work_to_do)
1955                         break;
1956
1957                 (*work_done)++;
1958 #endif
1959                 status = rx_desc->status;
1960                 skb = buffer_info->skb;
1961                 buffer_info->skb = NULL;
1962
1963                 prefetch(skb->data);
1964
1965                 if(++i == rx_ring->count) i = 0;
1966                 next_rxd = IXGB_RX_DESC(*rx_ring, i);
1967                 prefetch(next_rxd);
1968
1969                 if((j = i + 1) == rx_ring->count) j = 0;
1970                 next2_buffer = &rx_ring->buffer_info[j];
1971                 prefetch(next2_buffer);
1972
1973                 next_buffer = &rx_ring->buffer_info[i];
1974                 next_skb = next_buffer->skb;
1975                 prefetch(next_skb);
1976
1977                 cleaned = true;
1978
1979                 pci_unmap_single(pdev,
1980                                  buffer_info->dma,
1981                                  buffer_info->length,
1982                                  PCI_DMA_FROMDEVICE);
1983
1984                 length = le16_to_cpu(rx_desc->length);
1985
1986                 if(unlikely(!(status & IXGB_RX_DESC_STATUS_EOP))) {
1987
1988                         /* All receives must fit into a single buffer */
1989
1990                         IXGB_DBG("Receive packet consumed multiple buffers "
1991                                          "length<%x>\n", length);
1992
1993                         dev_kfree_skb_irq(skb);
1994                         goto rxdesc_done;
1995                 }
1996
1997                 if (unlikely(rx_desc->errors
1998                              & (IXGB_RX_DESC_ERRORS_CE | IXGB_RX_DESC_ERRORS_SE
1999                                 | IXGB_RX_DESC_ERRORS_P |
2000                                 IXGB_RX_DESC_ERRORS_RXE))) {
2001
2002                         dev_kfree_skb_irq(skb);
2003                         goto rxdesc_done;
2004                 }
2005
2006                 /* code added for copybreak, this should improve
2007                  * performance for small packets with large amounts
2008                  * of reassembly being done in the stack */
2009 #define IXGB_CB_LENGTH 256
2010                 if (length < IXGB_CB_LENGTH) {
2011                         struct sk_buff *new_skb =
2012                             netdev_alloc_skb(netdev, length + NET_IP_ALIGN);
2013                         if (new_skb) {
2014                                 skb_reserve(new_skb, NET_IP_ALIGN);
2015                                 skb_copy_to_linear_data_offset(new_skb,
2016                                                                -NET_IP_ALIGN,
2017                                                                (skb->data -
2018                                                                 NET_IP_ALIGN),
2019                                                                (length +
2020                                                                 NET_IP_ALIGN));
2021                                 /* save the skb in buffer_info as good */
2022                                 buffer_info->skb = skb;
2023                                 skb = new_skb;
2024                         }
2025                 }
2026                 /* end copybreak code */
2027
2028                 /* Good Receive */
2029                 skb_put(skb, length);
2030
2031                 /* Receive Checksum Offload */
2032                 ixgb_rx_checksum(adapter, rx_desc, skb);
2033
2034                 skb->protocol = eth_type_trans(skb, netdev);
2035 #ifdef CONFIG_IXGB_NAPI
2036                 if(adapter->vlgrp && (status & IXGB_RX_DESC_STATUS_VP)) {
2037                         vlan_hwaccel_receive_skb(skb, adapter->vlgrp,
2038                                 le16_to_cpu(rx_desc->special));
2039                 } else {
2040                         netif_receive_skb(skb);
2041                 }
2042 #else /* CONFIG_IXGB_NAPI */
2043                 if(adapter->vlgrp && (status & IXGB_RX_DESC_STATUS_VP)) {
2044                         vlan_hwaccel_rx(skb, adapter->vlgrp,
2045                                 le16_to_cpu(rx_desc->special));
2046                 } else {
2047                         netif_rx(skb);
2048                 }
2049 #endif /* CONFIG_IXGB_NAPI */
2050                 netdev->last_rx = jiffies;
2051
2052 rxdesc_done:
2053                 /* clean up descriptor, might be written over by hw */
2054                 rx_desc->status = 0;
2055
2056                 /* use prefetched values */
2057                 rx_desc = next_rxd;
2058                 buffer_info = next_buffer;
2059         }
2060
2061         rx_ring->next_to_clean = i;
2062
2063         ixgb_alloc_rx_buffers(adapter);
2064
2065         return cleaned;
2066 }
2067
2068 /**
2069  * ixgb_alloc_rx_buffers - Replace used receive buffers
2070  * @adapter: address of board private structure
2071  **/
2072
2073 static void
2074 ixgb_alloc_rx_buffers(struct ixgb_adapter *adapter)
2075 {
2076         struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
2077         struct net_device *netdev = adapter->netdev;
2078         struct pci_dev *pdev = adapter->pdev;
2079         struct ixgb_rx_desc *rx_desc;
2080         struct ixgb_buffer *buffer_info;
2081         struct sk_buff *skb;
2082         unsigned int i;
2083         long cleancount;
2084
2085         i = rx_ring->next_to_use;
2086         buffer_info = &rx_ring->buffer_info[i];
2087         cleancount = IXGB_DESC_UNUSED(rx_ring);
2088
2089
2090         /* leave three descriptors unused */
2091         while(--cleancount > 2) {
2092                 /* recycle! its good for you */
2093                 skb = buffer_info->skb;
2094                 if (skb) {
2095                         skb_trim(skb, 0);
2096                         goto map_skb;
2097                 }
2098
2099                 skb = netdev_alloc_skb(netdev, adapter->rx_buffer_len
2100                                        + NET_IP_ALIGN);
2101                 if (unlikely(!skb)) {
2102                         /* Better luck next round */
2103                         adapter->alloc_rx_buff_failed++;
2104                         break;
2105                 }
2106
2107                 /* Make buffer alignment 2 beyond a 16 byte boundary
2108                  * this will result in a 16 byte aligned IP header after
2109                  * the 14 byte MAC header is removed
2110                  */
2111                 skb_reserve(skb, NET_IP_ALIGN);
2112
2113                 buffer_info->skb = skb;
2114                 buffer_info->length = adapter->rx_buffer_len;
2115 map_skb:
2116                 buffer_info->dma = pci_map_single(pdev,
2117                                                   skb->data,
2118                                                   adapter->rx_buffer_len,
2119                                                   PCI_DMA_FROMDEVICE);
2120
2121                 rx_desc = IXGB_RX_DESC(*rx_ring, i);
2122                 rx_desc->buff_addr = cpu_to_le64(buffer_info->dma);
2123                 /* guarantee DD bit not set now before h/w gets descriptor
2124                  * this is the rest of the workaround for h/w double
2125                  * writeback. */
2126                 rx_desc->status = 0;
2127
2128
2129                 if(++i == rx_ring->count) i = 0;
2130                 buffer_info = &rx_ring->buffer_info[i];
2131         }
2132
2133         if (likely(rx_ring->next_to_use != i)) {
2134                 rx_ring->next_to_use = i;
2135                 if (unlikely(i-- == 0))
2136                         i = (rx_ring->count - 1);
2137
2138                 /* Force memory writes to complete before letting h/w
2139                  * know there are new descriptors to fetch.  (Only
2140                  * applicable for weak-ordered memory model archs, such
2141                  * as IA-64). */
2142                 wmb();
2143                 IXGB_WRITE_REG(&adapter->hw, RDT, i);
2144         }
2145 }
2146
2147 /**
2148  * ixgb_vlan_rx_register - enables or disables vlan tagging/stripping.
2149  *
2150  * @param netdev network interface device structure
2151  * @param grp indicates to enable or disable tagging/stripping
2152  **/
2153 static void
2154 ixgb_vlan_rx_register(struct net_device *netdev, struct vlan_group *grp)
2155 {
2156         struct ixgb_adapter *adapter = netdev_priv(netdev);
2157         u32 ctrl, rctl;
2158
2159         ixgb_irq_disable(adapter);
2160         adapter->vlgrp = grp;
2161
2162         if(grp) {
2163                 /* enable VLAN tag insert/strip */
2164                 ctrl = IXGB_READ_REG(&adapter->hw, CTRL0);
2165                 ctrl |= IXGB_CTRL0_VME;
2166                 IXGB_WRITE_REG(&adapter->hw, CTRL0, ctrl);
2167
2168                 /* enable VLAN receive filtering */
2169
2170                 rctl = IXGB_READ_REG(&adapter->hw, RCTL);
2171                 rctl |= IXGB_RCTL_VFE;
2172                 rctl &= ~IXGB_RCTL_CFIEN;
2173                 IXGB_WRITE_REG(&adapter->hw, RCTL, rctl);
2174         } else {
2175                 /* disable VLAN tag insert/strip */
2176
2177                 ctrl = IXGB_READ_REG(&adapter->hw, CTRL0);
2178                 ctrl &= ~IXGB_CTRL0_VME;
2179                 IXGB_WRITE_REG(&adapter->hw, CTRL0, ctrl);
2180
2181                 /* disable VLAN filtering */
2182
2183                 rctl = IXGB_READ_REG(&adapter->hw, RCTL);
2184                 rctl &= ~IXGB_RCTL_VFE;
2185                 IXGB_WRITE_REG(&adapter->hw, RCTL, rctl);
2186         }
2187
2188         /* don't enable interrupts unless we are UP */
2189         if (adapter->netdev->flags & IFF_UP)
2190                 ixgb_irq_enable(adapter);
2191 }
2192
2193 static void
2194 ixgb_vlan_rx_add_vid(struct net_device *netdev, u16 vid)
2195 {
2196         struct ixgb_adapter *adapter = netdev_priv(netdev);
2197         u32 vfta, index;
2198
2199         /* add VID to filter table */
2200
2201         index = (vid >> 5) & 0x7F;
2202         vfta = IXGB_READ_REG_ARRAY(&adapter->hw, VFTA, index);
2203         vfta |= (1 << (vid & 0x1F));
2204         ixgb_write_vfta(&adapter->hw, index, vfta);
2205 }
2206
2207 static void
2208 ixgb_vlan_rx_kill_vid(struct net_device *netdev, u16 vid)
2209 {
2210         struct ixgb_adapter *adapter = netdev_priv(netdev);
2211         u32 vfta, index;
2212
2213         ixgb_irq_disable(adapter);
2214
2215         vlan_group_set_device(adapter->vlgrp, vid, NULL);
2216
2217         /* don't enable interrupts unless we are UP */
2218         if (adapter->netdev->flags & IFF_UP)
2219                 ixgb_irq_enable(adapter);
2220
2221         /* remove VID from filter table */
2222
2223         index = (vid >> 5) & 0x7F;
2224         vfta = IXGB_READ_REG_ARRAY(&adapter->hw, VFTA, index);
2225         vfta &= ~(1 << (vid & 0x1F));
2226         ixgb_write_vfta(&adapter->hw, index, vfta);
2227 }
2228
2229 static void
2230 ixgb_restore_vlan(struct ixgb_adapter *adapter)
2231 {
2232         ixgb_vlan_rx_register(adapter->netdev, adapter->vlgrp);
2233
2234         if(adapter->vlgrp) {
2235                 u16 vid;
2236                 for(vid = 0; vid < VLAN_GROUP_ARRAY_LEN; vid++) {
2237                         if(!vlan_group_get_device(adapter->vlgrp, vid))
2238                                 continue;
2239                         ixgb_vlan_rx_add_vid(adapter->netdev, vid);
2240                 }
2241         }
2242 }
2243
2244 #ifdef CONFIG_NET_POLL_CONTROLLER
2245 /*
2246  * Polling 'interrupt' - used by things like netconsole to send skbs
2247  * without having to re-enable interrupts. It's not called while
2248  * the interrupt routine is executing.
2249  */
2250
2251 static void ixgb_netpoll(struct net_device *dev)
2252 {
2253         struct ixgb_adapter *adapter = netdev_priv(dev);
2254
2255         disable_irq(adapter->pdev->irq);
2256         ixgb_intr(adapter->pdev->irq, dev);
2257         enable_irq(adapter->pdev->irq);
2258 }
2259 #endif
2260
2261 /**
2262  * ixgb_io_error_detected() - called when PCI error is detected
2263  * @pdev    pointer to pci device with error
2264  * @state   pci channel state after error
2265  *
2266  * This callback is called by the PCI subsystem whenever
2267  * a PCI bus error is detected.
2268  */
2269 static pci_ers_result_t ixgb_io_error_detected (struct pci_dev *pdev,
2270                                      enum pci_channel_state state)
2271 {
2272         struct net_device *netdev = pci_get_drvdata(pdev);
2273         struct ixgb_adapter *adapter = netdev_priv(netdev);
2274
2275         if(netif_running(netdev))
2276                 ixgb_down(adapter, true);
2277
2278         pci_disable_device(pdev);
2279
2280         /* Request a slot reset. */
2281         return PCI_ERS_RESULT_NEED_RESET;
2282 }
2283
2284 /**
2285  * ixgb_io_slot_reset - called after the pci bus has been reset.
2286  * @pdev    pointer to pci device with error
2287  *
2288  * This callback is called after the PCI buss has been reset.
2289  * Basically, this tries to restart the card from scratch.
2290  * This is a shortened version of the device probe/discovery code,
2291  * it resembles the first-half of the ixgb_probe() routine.
2292  */
2293 static pci_ers_result_t ixgb_io_slot_reset (struct pci_dev *pdev)
2294 {
2295         struct net_device *netdev = pci_get_drvdata(pdev);
2296         struct ixgb_adapter *adapter = netdev_priv(netdev);
2297
2298         if(pci_enable_device(pdev)) {
2299                 DPRINTK(PROBE, ERR, "Cannot re-enable PCI device after reset.\n");
2300                 return PCI_ERS_RESULT_DISCONNECT;
2301         }
2302
2303         /* Perform card reset only on one instance of the card */
2304         if (0 != PCI_FUNC (pdev->devfn))
2305                 return PCI_ERS_RESULT_RECOVERED;
2306
2307         pci_set_master(pdev);
2308
2309         netif_carrier_off(netdev);
2310         netif_stop_queue(netdev);
2311         ixgb_reset(adapter);
2312
2313         /* Make sure the EEPROM is good */
2314         if(!ixgb_validate_eeprom_checksum(&adapter->hw)) {
2315                 DPRINTK(PROBE, ERR, "After reset, the EEPROM checksum is not valid.\n");
2316                 return PCI_ERS_RESULT_DISCONNECT;
2317         }
2318         ixgb_get_ee_mac_addr(&adapter->hw, netdev->dev_addr);
2319         memcpy(netdev->perm_addr, netdev->dev_addr, netdev->addr_len);
2320
2321         if(!is_valid_ether_addr(netdev->perm_addr)) {
2322                 DPRINTK(PROBE, ERR, "After reset, invalid MAC address.\n");
2323                 return PCI_ERS_RESULT_DISCONNECT;
2324         }
2325
2326         return PCI_ERS_RESULT_RECOVERED;
2327 }
2328
2329 /**
2330  * ixgb_io_resume - called when its OK to resume normal operations
2331  * @pdev    pointer to pci device with error
2332  *
2333  * The error recovery driver tells us that its OK to resume
2334  * normal operation. Implementation resembles the second-half
2335  * of the ixgb_probe() routine.
2336  */
2337 static void ixgb_io_resume (struct pci_dev *pdev)
2338 {
2339         struct net_device *netdev = pci_get_drvdata(pdev);
2340         struct ixgb_adapter *adapter = netdev_priv(netdev);
2341
2342         pci_set_master(pdev);
2343
2344         if(netif_running(netdev)) {
2345                 if(ixgb_up(adapter)) {
2346                         printk ("ixgb: can't bring device back up after reset\n");
2347                         return;
2348                 }
2349         }
2350
2351         netif_device_attach(netdev);
2352         mod_timer(&adapter->watchdog_timer, jiffies);
2353 }
2354
2355 /* ixgb_main.c */