drivers/net/ethernet/intel/ixgb/ixgb_main.c

   1 /*******************************************************************************
   2
   3   Intel PRO/10GbE Linux driver
   4   Copyright(c) 1999 - 2008 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 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  30
  31 #include <linux/prefetch.h>
  32 #include "ixgb.h"
  33
  34 char ixgb_driver_name[] = "ixgb";
  35 static char ixgb_driver_string[] = "Intel(R) PRO/10GbE Network Driver";
  36
  37 #define DRIVERNAPI "-NAPI"
  38 #define DRV_VERSION "1.0.135-k2" DRIVERNAPI
  39 const char ixgb_driver_version[] = DRV_VERSION;
  40 static const char ixgb_copyright[] = "Copyright (c) 1999-2008 Intel Corporation.";
  41
  42 #define IXGB_CB_LENGTH 256
  43 static unsigned int copybreak __read_mostly = IXGB_CB_LENGTH;
  44 module_param(copybreak, uint, 0644);
  45 MODULE_PARM_DESC(copybreak,
  46         "Maximum size of packet that is copied to a new buffer on receive");
  47
  48 /* ixgb_pci_tbl - PCI Device ID Table
  49  *
  50  * Wildcard entries (PCI_ANY_ID) should come last
  51  * Last entry must be all 0s
  52  *
  53  * { Vendor ID, Device ID, SubVendor ID, SubDevice ID,
  54  *   Class, Class Mask, private data (not used) }
  55  */
  56 static DEFINE_PCI_DEVICE_TABLE(ixgb_pci_tbl) = {
  57         {PCI_VENDOR_ID_INTEL, IXGB_DEVICE_ID_82597EX,
  58          PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
  59         {PCI_VENDOR_ID_INTEL, IXGB_DEVICE_ID_82597EX_CX4,
  60          PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
  61         {PCI_VENDOR_ID_INTEL, IXGB_DEVICE_ID_82597EX_SR,
  62          PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
  63         {PCI_VENDOR_ID_INTEL, IXGB_DEVICE_ID_82597EX_LR,
  64          PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
  65
  66         /* required last entry */
  67         {0,}
  68 };
  69
  70 MODULE_DEVICE_TABLE(pci, ixgb_pci_tbl);
  71
  72 /* Local Function Prototypes */
  73 static int ixgb_init_module(void);
  74 static void ixgb_exit_module(void);
  75 static int ixgb_probe(struct pci_dev *pdev, const struct pci_device_id *ent);
  76 static void ixgb_remove(struct pci_dev *pdev);
  77 static int ixgb_sw_init(struct ixgb_adapter *adapter);
  78 static int ixgb_open(struct net_device *netdev);
  79 static int ixgb_close(struct net_device *netdev);
  80 static void ixgb_configure_tx(struct ixgb_adapter *adapter);
  81 static void ixgb_configure_rx(struct ixgb_adapter *adapter);
  82 static void ixgb_setup_rctl(struct ixgb_adapter *adapter);
  83 static void ixgb_clean_tx_ring(struct ixgb_adapter *adapter);
  84 static void ixgb_clean_rx_ring(struct ixgb_adapter *adapter);
  85 static void ixgb_set_multi(struct net_device *netdev);
  86 static void ixgb_watchdog(unsigned long data);
  87 static netdev_tx_t ixgb_xmit_frame(struct sk_buff *skb,
  88                                    struct net_device *netdev);
  89 static struct net_device_stats *ixgb_get_stats(struct net_device *netdev);
  90 static int ixgb_change_mtu(struct net_device *netdev, int new_mtu);
  91 static int ixgb_set_mac(struct net_device *netdev, void *p);
  92 static irqreturn_t ixgb_intr(int irq, void *data);
  93 static bool ixgb_clean_tx_irq(struct ixgb_adapter *adapter);
  94
  95 static int ixgb_clean(struct napi_struct *, int);
  96 static bool ixgb_clean_rx_irq(struct ixgb_adapter *, int *, int);
  97 static void ixgb_alloc_rx_buffers(struct ixgb_adapter *, int);
  98
  99 static void ixgb_tx_timeout(struct net_device *dev);
 100 static void ixgb_tx_timeout_task(struct work_struct *work);
 101
 102 static void ixgb_vlan_strip_enable(struct ixgb_adapter *adapter);
 103 static void ixgb_vlan_strip_disable(struct ixgb_adapter *adapter);
 104 static int ixgb_vlan_rx_add_vid(struct net_device *netdev, u16 vid);
 105 static int ixgb_vlan_rx_kill_vid(struct net_device *netdev, u16 vid);
 106 static void ixgb_restore_vlan(struct ixgb_adapter *adapter);
 107
 108 #ifdef CONFIG_NET_POLL_CONTROLLER
 109 /* for netdump / net console */
 110 static void ixgb_netpoll(struct net_device *dev);
 111 #endif
 112
 113 static pci_ers_result_t ixgb_io_error_detected (struct pci_dev *pdev,
 114                              enum pci_channel_state state);
 115 static pci_ers_result_t ixgb_io_slot_reset (struct pci_dev *pdev);
 116 static void ixgb_io_resume (struct pci_dev *pdev);
 117
 118 static const struct pci_error_handlers ixgb_err_handler = {
 119         .error_detected = ixgb_io_error_detected,
 120         .slot_reset = ixgb_io_slot_reset,
 121         .resume = ixgb_io_resume,
 122 };
 123
 124 static struct pci_driver ixgb_driver = {
 125         .name     = ixgb_driver_name,
 126         .id_table = ixgb_pci_tbl,
 127         .probe    = ixgb_probe,
 128         .remove   = ixgb_remove,
 129         .err_handler = &ixgb_err_handler
 130 };
 131
 132 MODULE_AUTHOR("Intel Corporation, <linux.nics@intel.com>");
 133 MODULE_DESCRIPTION("Intel(R) PRO/10GbE Network Driver");
 134 MODULE_LICENSE("GPL");
 135 MODULE_VERSION(DRV_VERSION);
 136
 137 #define DEFAULT_MSG_ENABLE (NETIF_MSG_DRV|NETIF_MSG_PROBE|NETIF_MSG_LINK)
 138 static int debug = -1;
 139 module_param(debug, int, 0);
 140 MODULE_PARM_DESC(debug, "Debug level (0=none,...,16=all)");
 141
 142 /**
 143  * ixgb_init_module - Driver Registration Routine
 144  *
 145  * ixgb_init_module is the first routine called when the driver is
 146  * loaded. All it does is register with the PCI subsystem.
 147  **/
 148
 149 static int __init
 150 ixgb_init_module(void)
 151 {
 152         pr_info("%s - version %s\n", ixgb_driver_string, ixgb_driver_version);
 153         pr_info("%s\n", ixgb_copyright);
 154
 155         return pci_register_driver(&ixgb_driver);
 156 }
 157
 158 module_init(ixgb_init_module);
 159
 160 /**
 161  * ixgb_exit_module - Driver Exit Cleanup Routine
 162  *
 163  * ixgb_exit_module is called just before the driver is removed
 164  * from memory.
 165  **/
 166
 167 static void __exit
 168 ixgb_exit_module(void)
 169 {
 170         pci_unregister_driver(&ixgb_driver);
 171 }
 172
 173 module_exit(ixgb_exit_module);
 174
 175 /**
 176  * ixgb_irq_disable - Mask off interrupt generation on the NIC
 177  * @adapter: board private structure
 178  **/
 179
 180 static void
 181 ixgb_irq_disable(struct ixgb_adapter *adapter)
 182 {
 183         IXGB_WRITE_REG(&adapter->hw, IMC, ~0);
 184         IXGB_WRITE_FLUSH(&adapter->hw);
 185         synchronize_irq(adapter->pdev->irq);
 186 }
 187
 188 /**
 189  * ixgb_irq_enable - Enable default interrupt generation settings
 190  * @adapter: board private structure
 191  **/
 192
 193 static void
 194 ixgb_irq_enable(struct ixgb_adapter *adapter)
 195 {
 196         u32 val = IXGB_INT_RXT0 | IXGB_INT_RXDMT0 |
 197                   IXGB_INT_TXDW | IXGB_INT_LSC;
 198         if (adapter->hw.subsystem_vendor_id == PCI_VENDOR_ID_SUN)
 199                 val |= IXGB_INT_GPI0;
 200         IXGB_WRITE_REG(&adapter->hw, IMS, val);
 201         IXGB_WRITE_FLUSH(&adapter->hw);
 202 }
 203
 204 int
 205 ixgb_up(struct ixgb_adapter *adapter)
 206 {
 207         struct net_device *netdev = adapter->netdev;
 208         int err, irq_flags = IRQF_SHARED;
 209         int max_frame = netdev->mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;
 210         struct ixgb_hw *hw = &adapter->hw;
 211
 212         /* hardware has been reset, we need to reload some things */
 213
 214         ixgb_rar_set(hw, netdev->dev_addr, 0);
 215         ixgb_set_multi(netdev);
 216
 217         ixgb_restore_vlan(adapter);
 218
 219         ixgb_configure_tx(adapter);
 220         ixgb_setup_rctl(adapter);
 221         ixgb_configure_rx(adapter);
 222         ixgb_alloc_rx_buffers(adapter, IXGB_DESC_UNUSED(&adapter->rx_ring));
 223
 224         /* disable interrupts and get the hardware into a known state */
 225         IXGB_WRITE_REG(&adapter->hw, IMC, 0xffffffff);
 226
 227         /* only enable MSI if bus is in PCI-X mode */
 228         if (IXGB_READ_REG(&adapter->hw, STATUS) & IXGB_STATUS_PCIX_MODE) {
 229                 err = pci_enable_msi(adapter->pdev);
 230                 if (!err) {
 231                         adapter->have_msi = true;
 232                         irq_flags = 0;
 233                 }
 234                 /* proceed to try to request regular interrupt */
 235         }
 236
 237         err = request_irq(adapter->pdev->irq, ixgb_intr, irq_flags,
 238                           netdev->name, netdev);
 239         if (err) {
 240                 if (adapter->have_msi)
 241                         pci_disable_msi(adapter->pdev);
 242                 netif_err(adapter, probe, adapter->netdev,
 243                           "Unable to allocate interrupt Error: %d\n", err);
 244                 return err;
 245         }
 246
 247         if ((hw->max_frame_size != max_frame) ||
 248                 (hw->max_frame_size !=
 249                 (IXGB_READ_REG(hw, MFS) >> IXGB_MFS_SHIFT))) {
 250
 251                 hw->max_frame_size = max_frame;
 252
 253                 IXGB_WRITE_REG(hw, MFS, hw->max_frame_size << IXGB_MFS_SHIFT);
 254
 255                 if (hw->max_frame_size >
 256                    IXGB_MAX_ENET_FRAME_SIZE_WITHOUT_FCS + ENET_FCS_LENGTH) {
 257                         u32 ctrl0 = IXGB_READ_REG(hw, CTRL0);
 258
 259                         if (!(ctrl0 & IXGB_CTRL0_JFE)) {
 260                                 ctrl0 |= IXGB_CTRL0_JFE;
 261                                 IXGB_WRITE_REG(hw, CTRL0, ctrl0);
 262                         }
 263                 }
 264         }
 265
 266         clear_bit(__IXGB_DOWN, &adapter->flags);
 267
 268         napi_enable(&adapter->napi);
 269         ixgb_irq_enable(adapter);
 270
 271         netif_wake_queue(netdev);
 272
 273         mod_timer(&adapter->watchdog_timer, jiffies);
 274
 275         return 0;
 276 }
 277
 278 void
 279 ixgb_down(struct ixgb_adapter *adapter, bool kill_watchdog)
 280 {
 281         struct net_device *netdev = adapter->netdev;
 282
 283         /* prevent the interrupt handler from restarting watchdog */
 284         set_bit(__IXGB_DOWN, &adapter->flags);
 285
 286         napi_disable(&adapter->napi);
 287         /* waiting for NAPI to complete can re-enable interrupts */
 288         ixgb_irq_disable(adapter);
 289         free_irq(adapter->pdev->irq, netdev);
 290
 291         if (adapter->have_msi)
 292                 pci_disable_msi(adapter->pdev);
 293
 294         if (kill_watchdog)
 295                 del_timer_sync(&adapter->watchdog_timer);
 296
 297         adapter->link_speed = 0;
 298         adapter->link_duplex = 0;
 299         netif_carrier_off(netdev);
 300         netif_stop_queue(netdev);
 301
 302         ixgb_reset(adapter);
 303         ixgb_clean_tx_ring(adapter);
 304         ixgb_clean_rx_ring(adapter);
 305 }
 306
 307 void
 308 ixgb_reset(struct ixgb_adapter *adapter)
 309 {
 310         struct ixgb_hw *hw = &adapter->hw;
 311
 312         ixgb_adapter_stop(hw);
 313         if (!ixgb_init_hw(hw))
 314                 netif_err(adapter, probe, adapter->netdev, "ixgb_init_hw failed\n");
 315
 316         /* restore frame size information */
 317         IXGB_WRITE_REG(hw, MFS, hw->max_frame_size << IXGB_MFS_SHIFT);
 318         if (hw->max_frame_size >
 319             IXGB_MAX_ENET_FRAME_SIZE_WITHOUT_FCS + ENET_FCS_LENGTH) {
 320                 u32 ctrl0 = IXGB_READ_REG(hw, CTRL0);
 321                 if (!(ctrl0 & IXGB_CTRL0_JFE)) {
 322                         ctrl0 |= IXGB_CTRL0_JFE;
 323                         IXGB_WRITE_REG(hw, CTRL0, ctrl0);
 324                 }
 325         }
 326 }
 327
 328 static netdev_features_t
 329 ixgb_fix_features(struct net_device *netdev, netdev_features_t features)
 330 {
 331         /*
 332          * Tx VLAN insertion does not work per HW design when Rx stripping is
 333          * disabled.
 334          */
 335         if (!(features & NETIF_F_HW_VLAN_RX))
 336                 features &= ~NETIF_F_HW_VLAN_TX;
 337
 338         return features;
 339 }
 340
 341 static int
 342 ixgb_set_features(struct net_device *netdev, netdev_features_t features)
 343 {
 344         struct ixgb_adapter *adapter = netdev_priv(netdev);
 345         netdev_features_t changed = features ^ netdev->features;
 346
 347         if (!(changed & (NETIF_F_RXCSUM|NETIF_F_HW_VLAN_RX)))
 348                 return 0;
 349
 350         adapter->rx_csum = !!(features & NETIF_F_RXCSUM);
 351
 352         if (netif_running(netdev)) {
 353                 ixgb_down(adapter, true);
 354                 ixgb_up(adapter);
 355                 ixgb_set_speed_duplex(netdev);
 356         } else
 357                 ixgb_reset(adapter);
 358
 359         return 0;
 360 }
 361
 362
 363 static const struct net_device_ops ixgb_netdev_ops = {
 364         .ndo_open               = ixgb_open,
 365         .ndo_stop               = ixgb_close,
 366         .ndo_start_xmit         = ixgb_xmit_frame,
 367         .ndo_get_stats          = ixgb_get_stats,
 368         .ndo_set_rx_mode        = ixgb_set_multi,
 369         .ndo_validate_addr      = eth_validate_addr,
 370         .ndo_set_mac_address    = ixgb_set_mac,
 371         .ndo_change_mtu         = ixgb_change_mtu,
 372         .ndo_tx_timeout         = ixgb_tx_timeout,
 373         .ndo_vlan_rx_add_vid    = ixgb_vlan_rx_add_vid,
 374         .ndo_vlan_rx_kill_vid   = ixgb_vlan_rx_kill_vid,
 375 #ifdef CONFIG_NET_POLL_CONTROLLER
 376         .ndo_poll_controller    = ixgb_netpoll,
 377 #endif
 378         .ndo_fix_features       = ixgb_fix_features,
 379         .ndo_set_features       = ixgb_set_features,
 380 };
 381
 382 /**
 383  * ixgb_probe - Device Initialization Routine
 384  * @pdev: PCI device information struct
 385  * @ent: entry in ixgb_pci_tbl
 386  *
 387  * Returns 0 on success, negative on failure
 388  *
 389  * ixgb_probe initializes an adapter identified by a pci_dev structure.
 390  * The OS initialization, configuring of the adapter private structure,
 391  * and a hardware reset occur.
 392  **/
 393
 394 static int
 395 ixgb_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
 396 {
 397         struct net_device *netdev = NULL;
 398         struct ixgb_adapter *adapter;
 399         static int cards_found = 0;
 400         int pci_using_dac;
 401         int i;
 402         int err;
 403
 404         err = pci_enable_device(pdev);
 405         if (err)
 406                 return err;
 407
 408         pci_using_dac = 0;
 409         err = dma_set_mask(&pdev->dev, DMA_BIT_MASK(64));
 410         if (!err) {
 411                 err = dma_set_coherent_mask(&pdev->dev, DMA_BIT_MASK(64));
 412                 if (!err)
 413                         pci_using_dac = 1;
 414         } else {
 415                 err = dma_set_mask(&pdev->dev, DMA_BIT_MASK(32));
 416                 if (err) {
 417                         err = dma_set_coherent_mask(&pdev->dev,
 418                                                     DMA_BIT_MASK(32));
 419                         if (err) {
 420                                 pr_err("No usable DMA configuration, aborting\n");
 421                                 goto err_dma_mask;
 422                         }
 423                 }
 424         }
 425
 426         err = pci_request_regions(pdev, ixgb_driver_name);
 427         if (err)
 428                 goto err_request_regions;
 429
 430         pci_set_master(pdev);
 431
 432         netdev = alloc_etherdev(sizeof(struct ixgb_adapter));
 433         if (!netdev) {
 434                 err = -ENOMEM;
 435                 goto err_alloc_etherdev;
 436         }
 437
 438         SET_NETDEV_DEV(netdev, &pdev->dev);
 439
 440         pci_set_drvdata(pdev, netdev);
 441         adapter = netdev_priv(netdev);
 442         adapter->netdev = netdev;
 443         adapter->pdev = pdev;
 444         adapter->hw.back = adapter;
 445         adapter->msg_enable = netif_msg_init(debug, DEFAULT_MSG_ENABLE);
 446
 447         adapter->hw.hw_addr = pci_ioremap_bar(pdev, BAR_0);
 448         if (!adapter->hw.hw_addr) {
 449                 err = -EIO;
 450                 goto err_ioremap;
 451         }
 452
 453         for (i = BAR_1; i <= BAR_5; i++) {
 454                 if (pci_resource_len(pdev, i) == 0)
 455                         continue;
 456                 if (pci_resource_flags(pdev, i) & IORESOURCE_IO) {
 457                         adapter->hw.io_base = pci_resource_start(pdev, i);
 458                         break;
 459                 }
 460         }
 461
 462         netdev->netdev_ops = &ixgb_netdev_ops;
 463         ixgb_set_ethtool_ops(netdev);
 464         netdev->watchdog_timeo = 5 * HZ;
 465         netif_napi_add(netdev, &adapter->napi, ixgb_clean, 64);
 466
 467         strncpy(netdev->name, pci_name(pdev), sizeof(netdev->name) - 1);
 468
 469         adapter->bd_number = cards_found;
 470         adapter->link_speed = 0;
 471         adapter->link_duplex = 0;
 472
 473         /* setup the private structure */
 474
 475         err = ixgb_sw_init(adapter);
 476         if (err)
 477                 goto err_sw_init;
 478
 479         netdev->hw_features = NETIF_F_SG |
 480                            NETIF_F_TSO |
 481                            NETIF_F_HW_CSUM |
 482                            NETIF_F_HW_VLAN_TX |
 483                            NETIF_F_HW_VLAN_RX;
 484         netdev->features = netdev->hw_features |
 485                            NETIF_F_HW_VLAN_FILTER;
 486         netdev->hw_features |= NETIF_F_RXCSUM;
 487
 488         if (pci_using_dac) {
 489                 netdev->features |= NETIF_F_HIGHDMA;
 490                 netdev->vlan_features |= NETIF_F_HIGHDMA;
 491         }
 492
 493         /* make sure the EEPROM is good */
 494
 495         if (!ixgb_validate_eeprom_checksum(&adapter->hw)) {
 496                 netif_err(adapter, probe, adapter->netdev,
 497                           "The EEPROM Checksum Is Not Valid\n");
 498                 err = -EIO;
 499                 goto err_eeprom;
 500         }
 501
 502         ixgb_get_ee_mac_addr(&adapter->hw, netdev->dev_addr);
 503
 504         if (!is_valid_ether_addr(netdev->dev_addr)) {
 505                 netif_err(adapter, probe, adapter->netdev, "Invalid MAC Address\n");
 506                 err = -EIO;
 507                 goto err_eeprom;
 508         }
 509
 510         adapter->part_num = ixgb_get_ee_pba_number(&adapter->hw);
 511
 512         init_timer(&adapter->watchdog_timer);
 513         adapter->watchdog_timer.function = ixgb_watchdog;
 514         adapter->watchdog_timer.data = (unsigned long)adapter;
 515
 516         INIT_WORK(&adapter->tx_timeout_task, ixgb_tx_timeout_task);
 517
 518         strcpy(netdev->name, "eth%d");
 519         err = register_netdev(netdev);
 520         if (err)
 521                 goto err_register;
 522
 523         /* carrier off reporting is important to ethtool even BEFORE open */
 524         netif_carrier_off(netdev);
 525
 526         netif_info(adapter, probe, adapter->netdev,
 527                    "Intel(R) PRO/10GbE Network Connection\n");
 528         ixgb_check_options(adapter);
 529         /* reset the hardware with the new settings */
 530
 531         ixgb_reset(adapter);
 532
 533         cards_found++;
 534         return 0;
 535
 536 err_register:
 537 err_sw_init:
 538 err_eeprom:
 539         iounmap(adapter->hw.hw_addr);
 540 err_ioremap:
 541         free_netdev(netdev);
 542 err_alloc_etherdev:
 543         pci_release_regions(pdev);
 544 err_request_regions:
 545 err_dma_mask:
 546         pci_disable_device(pdev);
 547         return err;
 548 }
 549
 550 /**
 551  * ixgb_remove - Device Removal Routine
 552  * @pdev: PCI device information struct
 553  *
 554  * ixgb_remove is called by the PCI subsystem to alert the driver
 555  * that it should release a PCI device.  The could be caused by a
 556  * Hot-Plug event, or because the driver is going to be removed from
 557  * memory.
 558  **/
 559
 560 static void
 561 ixgb_remove(struct pci_dev *pdev)
 562 {
 563         struct net_device *netdev = pci_get_drvdata(pdev);
 564         struct ixgb_adapter *adapter = netdev_priv(netdev);
 565
 566         cancel_work_sync(&adapter->tx_timeout_task);
 567
 568         unregister_netdev(netdev);
 569
 570         iounmap(adapter->hw.hw_addr);
 571         pci_release_regions(pdev);
 572
 573         free_netdev(netdev);
 574         pci_disable_device(pdev);
 575 }
 576
 577 /**
 578  * ixgb_sw_init - Initialize general software structures (struct ixgb_adapter)
 579  * @adapter: board private structure to initialize
 580  *
 581  * ixgb_sw_init initializes the Adapter private data structure.
 582  * Fields are initialized based on PCI device information and
 583  * OS network device settings (MTU size).
 584  **/
 585
 586 static int
 587 ixgb_sw_init(struct ixgb_adapter *adapter)
 588 {
 589         struct ixgb_hw *hw = &adapter->hw;
 590         struct net_device *netdev = adapter->netdev;
 591         struct pci_dev *pdev = adapter->pdev;
 592
 593         /* PCI config space info */
 594
 595         hw->vendor_id = pdev->vendor;
 596         hw->device_id = pdev->device;
 597         hw->subsystem_vendor_id = pdev->subsystem_vendor;
 598         hw->subsystem_id = pdev->subsystem_device;
 599
 600         hw->max_frame_size = netdev->mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;
 601         adapter->rx_buffer_len = hw->max_frame_size + 8; /* + 8 for errata */
 602
 603         if ((hw->device_id == IXGB_DEVICE_ID_82597EX) ||
 604             (hw->device_id == IXGB_DEVICE_ID_82597EX_CX4) ||
 605             (hw->device_id == IXGB_DEVICE_ID_82597EX_LR) ||
 606             (hw->device_id == IXGB_DEVICE_ID_82597EX_SR))
 607                 hw->mac_type = ixgb_82597;
 608         else {
 609                 /* should never have loaded on this device */
 610                 netif_err(adapter, probe, adapter->netdev, "unsupported device id\n");
 611         }
 612
 613         /* enable flow control to be programmed */
 614         hw->fc.send_xon = 1;
 615
 616         set_bit(__IXGB_DOWN, &adapter->flags);
 617         return 0;
 618 }
 619
 620 /**
 621  * ixgb_open - Called when a network interface is made active
 622  * @netdev: network interface device structure
 623  *
 624  * Returns 0 on success, negative value on failure
 625  *
 626  * The open entry point is called when a network interface is made
 627  * active by the system (IFF_UP).  At this point all resources needed
 628  * for transmit and receive operations are allocated, the interrupt
 629  * handler is registered with the OS, the watchdog timer is started,
 630  * and the stack is notified that the interface is ready.
 631  **/
 632
 633 static int
 634 ixgb_open(struct net_device *netdev)
 635 {
 636         struct ixgb_adapter *adapter = netdev_priv(netdev);
 637         int err;
 638
 639         /* allocate transmit descriptors */
 640         err = ixgb_setup_tx_resources(adapter);
 641         if (err)
 642                 goto err_setup_tx;
 643
 644         netif_carrier_off(netdev);
 645
 646         /* allocate receive descriptors */
 647
 648         err = ixgb_setup_rx_resources(adapter);
 649         if (err)
 650                 goto err_setup_rx;
 651
 652         err = ixgb_up(adapter);
 653         if (err)
 654                 goto err_up;
 655
 656         netif_start_queue(netdev);
 657
 658         return 0;
 659
 660 err_up:
 661         ixgb_free_rx_resources(adapter);
 662 err_setup_rx:
 663         ixgb_free_tx_resources(adapter);
 664 err_setup_tx:
 665         ixgb_reset(adapter);
 666
 667         return err;
 668 }
 669
 670 /**
 671  * ixgb_close - Disables a network interface
 672  * @netdev: network interface device structure
 673  *
 674  * Returns 0, this is not allowed to fail
 675  *
 676  * The close entry point is called when an interface is de-activated
 677  * by the OS.  The hardware is still under the drivers control, but
 678  * needs to be disabled.  A global MAC reset is issued to stop the
 679  * hardware, and all transmit and receive resources are freed.
 680  **/
 681
 682 static int
 683 ixgb_close(struct net_device *netdev)
 684 {
 685         struct ixgb_adapter *adapter = netdev_priv(netdev);
 686
 687         ixgb_down(adapter, true);
 688
 689         ixgb_free_tx_resources(adapter);
 690         ixgb_free_rx_resources(adapter);
 691
 692         return 0;
 693 }
 694
 695 /**
 696  * ixgb_setup_tx_resources - allocate Tx resources (Descriptors)
 697  * @adapter: board private structure
 698  *
 699  * Return 0 on success, negative on failure
 700  **/
 701
 702 int
 703 ixgb_setup_tx_resources(struct ixgb_adapter *adapter)
 704 {
 705         struct ixgb_desc_ring *txdr = &adapter->tx_ring;
 706         struct pci_dev *pdev = adapter->pdev;
 707         int size;
 708
 709         size = sizeof(struct ixgb_buffer) * txdr->count;
 710         txdr->buffer_info = vzalloc(size);
 711         if (!txdr->buffer_info) {
 712                 netif_err(adapter, probe, adapter->netdev,
 713                           "Unable to allocate transmit descriptor ring memory\n");
 714                 return -ENOMEM;
 715         }
 716
 717         /* round up to nearest 4K */
 718
 719         txdr->size = txdr->count * sizeof(struct ixgb_tx_desc);
 720         txdr->size = ALIGN(txdr->size, 4096);
 721
 722         txdr->desc = dma_alloc_coherent(&pdev->dev, txdr->size, &txdr->dma,
 723                                         GFP_KERNEL);
 724         if (!txdr->desc) {
 725                 vfree(txdr->buffer_info);
 726                 netif_err(adapter, probe, adapter->netdev,
 727                           "Unable to allocate transmit descriptor memory\n");
 728                 return -ENOMEM;
 729         }
 730         memset(txdr->desc, 0, txdr->size);
 731
 732         txdr->next_to_use = 0;
 733         txdr->next_to_clean = 0;
 734
 735         return 0;
 736 }
 737
 738 /**
 739  * ixgb_configure_tx - Configure 82597 Transmit Unit after Reset.
 740  * @adapter: board private structure
 741  *
 742  * Configure the Tx unit of the MAC after a reset.
 743  **/
 744
 745 static void
 746 ixgb_configure_tx(struct ixgb_adapter *adapter)
 747 {
 748         u64 tdba = adapter->tx_ring.dma;
 749         u32 tdlen = adapter->tx_ring.count * sizeof(struct ixgb_tx_desc);
 750         u32 tctl;
 751         struct ixgb_hw *hw = &adapter->hw;
 752
 753         /* Setup the Base and Length of the Tx Descriptor Ring
 754          * tx_ring.dma can be either a 32 or 64 bit value
 755          */
 756
 757         IXGB_WRITE_REG(hw, TDBAL, (tdba & 0x00000000ffffffffULL));
 758         IXGB_WRITE_REG(hw, TDBAH, (tdba >> 32));
 759
 760         IXGB_WRITE_REG(hw, TDLEN, tdlen);
 761
 762         /* Setup the HW Tx Head and Tail descriptor pointers */
 763
 764         IXGB_WRITE_REG(hw, TDH, 0);
 765         IXGB_WRITE_REG(hw, TDT, 0);
 766
 767         /* don't set up txdctl, it induces performance problems if configured
 768          * incorrectly */
 769         /* Set the Tx Interrupt Delay register */
 770
 771         IXGB_WRITE_REG(hw, TIDV, adapter->tx_int_delay);
 772
 773         /* Program the Transmit Control Register */
 774
 775         tctl = IXGB_TCTL_TCE | IXGB_TCTL_TXEN | IXGB_TCTL_TPDE;
 776         IXGB_WRITE_REG(hw, TCTL, tctl);
 777
 778         /* Setup Transmit Descriptor Settings for this adapter */
 779         adapter->tx_cmd_type =
 780                 IXGB_TX_DESC_TYPE |
 781                 (adapter->tx_int_delay_enable ? IXGB_TX_DESC_CMD_IDE : 0);
 782 }
 783
 784 /**
 785  * ixgb_setup_rx_resources - allocate Rx resources (Descriptors)
 786  * @adapter: board private structure
 787  *
 788  * Returns 0 on success, negative on failure
 789  **/
 790
 791 int
 792 ixgb_setup_rx_resources(struct ixgb_adapter *adapter)
 793 {
 794         struct ixgb_desc_ring *rxdr = &adapter->rx_ring;
 795         struct pci_dev *pdev = adapter->pdev;
 796         int size;
 797
 798         size = sizeof(struct ixgb_buffer) * rxdr->count;
 799         rxdr->buffer_info = vzalloc(size);
 800         if (!rxdr->buffer_info) {
 801                 netif_err(adapter, probe, adapter->netdev,
 802                           "Unable to allocate receive descriptor ring\n");
 803                 return -ENOMEM;
 804         }
 805
 806         /* Round up to nearest 4K */
 807
 808         rxdr->size = rxdr->count * sizeof(struct ixgb_rx_desc);
 809         rxdr->size = ALIGN(rxdr->size, 4096);
 810
 811         rxdr->desc = dma_alloc_coherent(&pdev->dev, rxdr->size, &rxdr->dma,
 812                                         GFP_KERNEL);
 813
 814         if (!rxdr->desc) {
 815                 vfree(rxdr->buffer_info);
 816                 netif_err(adapter, probe, adapter->netdev,
 817                           "Unable to allocate receive descriptors\n");
 818                 return -ENOMEM;
 819         }
 820         memset(rxdr->desc, 0, rxdr->size);
 821
 822         rxdr->next_to_clean = 0;
 823         rxdr->next_to_use = 0;
 824
 825         return 0;
 826 }
 827
 828 /**
 829  * ixgb_setup_rctl - configure the receive control register
 830  * @adapter: Board private structure
 831  **/
 832
 833 static void
 834 ixgb_setup_rctl(struct ixgb_adapter *adapter)
 835 {
 836         u32 rctl;
 837
 838         rctl = IXGB_READ_REG(&adapter->hw, RCTL);
 839
 840         rctl &= ~(3 << IXGB_RCTL_MO_SHIFT);
 841
 842         rctl |=
 843                 IXGB_RCTL_BAM | IXGB_RCTL_RDMTS_1_2 |
 844                 IXGB_RCTL_RXEN | IXGB_RCTL_CFF |
 845                 (adapter->hw.mc_filter_type << IXGB_RCTL_MO_SHIFT);
 846
 847         rctl |= IXGB_RCTL_SECRC;
 848
 849         if (adapter->rx_buffer_len <= IXGB_RXBUFFER_2048)
 850                 rctl |= IXGB_RCTL_BSIZE_2048;
 851         else if (adapter->rx_buffer_len <= IXGB_RXBUFFER_4096)
 852                 rctl |= IXGB_RCTL_BSIZE_4096;
 853         else if (adapter->rx_buffer_len <= IXGB_RXBUFFER_8192)
 854                 rctl |= IXGB_RCTL_BSIZE_8192;
 855         else if (adapter->rx_buffer_len <= IXGB_RXBUFFER_16384)
 856                 rctl |= IXGB_RCTL_BSIZE_16384;
 857
 858         IXGB_WRITE_REG(&adapter->hw, RCTL, rctl);
 859 }
 860
 861 /**
 862  * ixgb_configure_rx - Configure 82597 Receive Unit after Reset.
 863  * @adapter: board private structure
 864  *
 865  * Configure the Rx unit of the MAC after a reset.
 866  **/
 867
 868 static void
 869 ixgb_configure_rx(struct ixgb_adapter *adapter)
 870 {
 871         u64 rdba = adapter->rx_ring.dma;
 872         u32 rdlen = adapter->rx_ring.count * sizeof(struct ixgb_rx_desc);
 873         struct ixgb_hw *hw = &adapter->hw;
 874         u32 rctl;
 875         u32 rxcsum;
 876
 877         /* make sure receives are disabled while setting up the descriptors */
 878
 879         rctl = IXGB_READ_REG(hw, RCTL);
 880         IXGB_WRITE_REG(hw, RCTL, rctl & ~IXGB_RCTL_RXEN);
 881
 882         /* set the Receive Delay Timer Register */
 883
 884         IXGB_WRITE_REG(hw, RDTR, adapter->rx_int_delay);
 885
 886         /* Setup the Base and Length of the Rx Descriptor Ring */
 887
 888         IXGB_WRITE_REG(hw, RDBAL, (rdba & 0x00000000ffffffffULL));
 889         IXGB_WRITE_REG(hw, RDBAH, (rdba >> 32));
 890
 891         IXGB_WRITE_REG(hw, RDLEN, rdlen);
 892
 893         /* Setup the HW Rx Head and Tail Descriptor Pointers */
 894         IXGB_WRITE_REG(hw, RDH, 0);
 895         IXGB_WRITE_REG(hw, RDT, 0);
 896
 897         /* due to the hardware errata with RXDCTL, we are unable to use any of
 898          * the performance enhancing features of it without causing other
 899          * subtle bugs, some of the bugs could include receive length
 900          * corruption at high data rates (WTHRESH > 0) and/or receive
 901          * descriptor ring irregularites (particularly in hardware cache) */
 902         IXGB_WRITE_REG(hw, RXDCTL, 0);
 903
 904         /* Enable Receive Checksum Offload for TCP and UDP */
 905         if (adapter->rx_csum) {
 906                 rxcsum = IXGB_READ_REG(hw, RXCSUM);
 907                 rxcsum |= IXGB_RXCSUM_TUOFL;
 908                 IXGB_WRITE_REG(hw, RXCSUM, rxcsum);
 909         }
 910
 911         /* Enable Receives */
 912
 913         IXGB_WRITE_REG(hw, RCTL, rctl);
 914 }
 915
 916 /**
 917  * ixgb_free_tx_resources - Free Tx Resources
 918  * @adapter: board private structure
 919  *
 920  * Free all transmit software resources
 921  **/
 922
 923 void
 924 ixgb_free_tx_resources(struct ixgb_adapter *adapter)
 925 {
 926         struct pci_dev *pdev = adapter->pdev;
 927
 928         ixgb_clean_tx_ring(adapter);
 929
 930         vfree(adapter->tx_ring.buffer_info);
 931         adapter->tx_ring.buffer_info = NULL;
 932
 933         dma_free_coherent(&pdev->dev, adapter->tx_ring.size,
 934                           adapter->tx_ring.desc, adapter->tx_ring.dma);
 935
 936         adapter->tx_ring.desc = NULL;
 937 }
 938
 939 static void
 940 ixgb_unmap_and_free_tx_resource(struct ixgb_adapter *adapter,
 941                                 struct ixgb_buffer *buffer_info)
 942 {
 943         if (buffer_info->dma) {
 944                 if (buffer_info->mapped_as_page)
 945                         dma_unmap_page(&adapter->pdev->dev, buffer_info->dma,
 946                                        buffer_info->length, DMA_TO_DEVICE);
 947                 else
 948                         dma_unmap_single(&adapter->pdev->dev, buffer_info->dma,
 949                                          buffer_info->length, DMA_TO_DEVICE);
 950                 buffer_info->dma = 0;
 951         }
 952
 953         if (buffer_info->skb) {
 954                 dev_kfree_skb_any(buffer_info->skb);
 955                 buffer_info->skb = NULL;
 956         }
 957         buffer_info->time_stamp = 0;
 958         /* these fields must always be initialized in tx
 959          * buffer_info->length = 0;
 960          * buffer_info->next_to_watch = 0; */
 961 }
 962
 963 /**
 964  * ixgb_clean_tx_ring - Free Tx Buffers
 965  * @adapter: board private structure
 966  **/
 967
 968 static void
 969 ixgb_clean_tx_ring(struct ixgb_adapter *adapter)
 970 {
 971         struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
 972         struct ixgb_buffer *buffer_info;
 973         unsigned long size;
 974         unsigned int i;
 975
 976         /* Free all the Tx ring sk_buffs */
 977
 978         for (i = 0; i < tx_ring->count; i++) {
 979                 buffer_info = &tx_ring->buffer_info[i];
 980                 ixgb_unmap_and_free_tx_resource(adapter, buffer_info);
 981         }
 982
 983         size = sizeof(struct ixgb_buffer) * tx_ring->count;
 984         memset(tx_ring->buffer_info, 0, size);
 985
 986         /* Zero out the descriptor ring */
 987
 988         memset(tx_ring->desc, 0, tx_ring->size);
 989
 990         tx_ring->next_to_use = 0;
 991         tx_ring->next_to_clean = 0;
 992
 993         IXGB_WRITE_REG(&adapter->hw, TDH, 0);
 994         IXGB_WRITE_REG(&adapter->hw, TDT, 0);
 995 }
 996
 997 /**
 998  * ixgb_free_rx_resources - Free Rx Resources
 999  * @adapter: board private structure
1000  *
1001  * Free all receive software resources
1002  **/
1003
1004 void
1005 ixgb_free_rx_resources(struct ixgb_adapter *adapter)
1006 {
1007         struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
1008         struct pci_dev *pdev = adapter->pdev;
1009
1010         ixgb_clean_rx_ring(adapter);
1011
1012         vfree(rx_ring->buffer_info);
1013         rx_ring->buffer_info = NULL;
1014
1015         dma_free_coherent(&pdev->dev, rx_ring->size, rx_ring->desc,
1016                           rx_ring->dma);
1017
1018         rx_ring->desc = NULL;
1019 }
1020
1021 /**
1022  * ixgb_clean_rx_ring - Free Rx Buffers
1023  * @adapter: board private structure
1024  **/
1025
1026 static void
1027 ixgb_clean_rx_ring(struct ixgb_adapter *adapter)
1028 {
1029         struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
1030         struct ixgb_buffer *buffer_info;
1031         struct pci_dev *pdev = adapter->pdev;
1032         unsigned long size;
1033         unsigned int i;
1034
1035         /* Free all the Rx ring sk_buffs */
1036
1037         for (i = 0; i < rx_ring->count; i++) {
1038                 buffer_info = &rx_ring->buffer_info[i];
1039                 if (buffer_info->dma) {
1040                         dma_unmap_single(&pdev->dev,
1041                                          buffer_info->dma,
1042                                          buffer_info->length,
1043                                          DMA_FROM_DEVICE);
1044                         buffer_info->dma = 0;
1045                         buffer_info->length = 0;
1046                 }
1047
1048                 if (buffer_info->skb) {
1049                         dev_kfree_skb(buffer_info->skb);
1050                         buffer_info->skb = NULL;
1051                 }
1052         }
1053
1054         size = sizeof(struct ixgb_buffer) * rx_ring->count;
1055         memset(rx_ring->buffer_info, 0, size);
1056
1057         /* Zero out the descriptor ring */
1058
1059         memset(rx_ring->desc, 0, rx_ring->size);
1060
1061         rx_ring->next_to_clean = 0;
1062         rx_ring->next_to_use = 0;
1063
1064         IXGB_WRITE_REG(&adapter->hw, RDH, 0);
1065         IXGB_WRITE_REG(&adapter->hw, RDT, 0);
1066 }
1067
1068 /**
1069  * ixgb_set_mac - Change the Ethernet Address of the NIC
1070  * @netdev: network interface device structure
1071  * @p: pointer to an address structure
1072  *
1073  * Returns 0 on success, negative on failure
1074  **/
1075
1076 static int
1077 ixgb_set_mac(struct net_device *netdev, void *p)
1078 {
1079         struct ixgb_adapter *adapter = netdev_priv(netdev);
1080         struct sockaddr *addr = p;
1081
1082         if (!is_valid_ether_addr(addr->sa_data))
1083                 return -EADDRNOTAVAIL;
1084
1085         memcpy(netdev->dev_addr, addr->sa_data, netdev->addr_len);
1086
1087         ixgb_rar_set(&adapter->hw, addr->sa_data, 0);
1088
1089         return 0;
1090 }
1091
1092 /**
1093  * ixgb_set_multi - Multicast and Promiscuous mode set
1094  * @netdev: network interface device structure
1095  *
1096  * The set_multi entry point is called whenever the multicast address
1097  * list or the network interface flags are updated.  This routine is
1098  * responsible for configuring the hardware for proper multicast,
1099  * promiscuous mode, and all-multi behavior.
1100  **/
1101
1102 static void
1103 ixgb_set_multi(struct net_device *netdev)
1104 {
1105         struct ixgb_adapter *adapter = netdev_priv(netdev);
1106         struct ixgb_hw *hw = &adapter->hw;
1107         struct netdev_hw_addr *ha;
1108         u32 rctl;
1109
1110         /* Check for Promiscuous and All Multicast modes */
1111
1112         rctl = IXGB_READ_REG(hw, RCTL);
1113
1114         if (netdev->flags & IFF_PROMISC) {
1115                 rctl |= (IXGB_RCTL_UPE | IXGB_RCTL_MPE);
1116                 /* disable VLAN filtering */
1117                 rctl &= ~IXGB_RCTL_CFIEN;
1118                 rctl &= ~IXGB_RCTL_VFE;
1119         } else {
1120                 if (netdev->flags & IFF_ALLMULTI) {
1121                         rctl |= IXGB_RCTL_MPE;
1122                         rctl &= ~IXGB_RCTL_UPE;
1123                 } else {
1124                         rctl &= ~(IXGB_RCTL_UPE | IXGB_RCTL_MPE);
1125                 }
1126                 /* enable VLAN filtering */
1127                 rctl |= IXGB_RCTL_VFE;
1128                 rctl &= ~IXGB_RCTL_CFIEN;
1129         }
1130
1131         if (netdev_mc_count(netdev) > IXGB_MAX_NUM_MULTICAST_ADDRESSES) {
1132                 rctl |= IXGB_RCTL_MPE;
1133                 IXGB_WRITE_REG(hw, RCTL, rctl);
1134         } else {
1135                 u8 *mta = kmalloc(IXGB_MAX_NUM_MULTICAST_ADDRESSES *
1136                               ETH_ALEN, GFP_ATOMIC);
1137                 u8 *addr;
1138                 if (!mta)
1139                         goto alloc_failed;
1140
1141                 IXGB_WRITE_REG(hw, RCTL, rctl);
1142
1143                 addr = mta;
1144                 netdev_for_each_mc_addr(ha, netdev) {
1145                         memcpy(addr, ha->addr, ETH_ALEN);
1146                         addr += ETH_ALEN;
1147                 }
1148
1149                 ixgb_mc_addr_list_update(hw, mta, netdev_mc_count(netdev), 0);
1150                 kfree(mta);
1151         }
1152
1153 alloc_failed:
1154         if (netdev->features & NETIF_F_HW_VLAN_RX)
1155                 ixgb_vlan_strip_enable(adapter);
1156         else
1157                 ixgb_vlan_strip_disable(adapter);
1158
1159 }
1160
1161 /**
1162  * ixgb_watchdog - Timer Call-back
1163  * @data: pointer to netdev cast into an unsigned long
1164  **/
1165
1166 static void
1167 ixgb_watchdog(unsigned long data)
1168 {
1169         struct ixgb_adapter *adapter = (struct ixgb_adapter *)data;
1170         struct net_device *netdev = adapter->netdev;
1171         struct ixgb_desc_ring *txdr = &adapter->tx_ring;
1172
1173         ixgb_check_for_link(&adapter->hw);
1174
1175         if (ixgb_check_for_bad_link(&adapter->hw)) {
1176                 /* force the reset path */
1177                 netif_stop_queue(netdev);
1178         }
1179
1180         if (adapter->hw.link_up) {
1181                 if (!netif_carrier_ok(netdev)) {
1182                         netdev_info(netdev,
1183                                     "NIC Link is Up 10 Gbps Full Duplex, Flow Control: %s\n",
1184                                     (adapter->hw.fc.type == ixgb_fc_full) ?
1185                                     "RX/TX" :
1186                                     (adapter->hw.fc.type == ixgb_fc_rx_pause) ?
1187                                      "RX" :
1188                                     (adapter->hw.fc.type == ixgb_fc_tx_pause) ?
1189                                     "TX" : "None");
1190                         adapter->link_speed = 10000;
1191                         adapter->link_duplex = FULL_DUPLEX;
1192                         netif_carrier_on(netdev);
1193                 }
1194         } else {
1195                 if (netif_carrier_ok(netdev)) {
1196                         adapter->link_speed = 0;
1197                         adapter->link_duplex = 0;
1198                         netdev_info(netdev, "NIC Link is Down\n");
1199                         netif_carrier_off(netdev);
1200                 }
1201         }
1202
1203         ixgb_update_stats(adapter);
1204
1205         if (!netif_carrier_ok(netdev)) {
1206                 if (IXGB_DESC_UNUSED(txdr) + 1 < txdr->count) {
1207                         /* We've lost link, so the controller stops DMA,
1208                          * but we've got queued Tx work that's never going
1209                          * to get done, so reset controller to flush Tx.
1210                          * (Do the reset outside of interrupt context). */
1211                         schedule_work(&adapter->tx_timeout_task);
1212                         /* return immediately since reset is imminent */
1213                         return;
1214                 }
1215         }
1216
1217         /* Force detection of hung controller every watchdog period */
1218         adapter->detect_tx_hung = true;
1219
1220         /* generate an interrupt to force clean up of any stragglers */
1221         IXGB_WRITE_REG(&adapter->hw, ICS, IXGB_INT_TXDW);
1222
1223         /* Reset the timer */
1224         mod_timer(&adapter->watchdog_timer, jiffies + 2 * HZ);
1225 }
1226
1227 #define IXGB_TX_FLAGS_CSUM              0x00000001
1228 #define IXGB_TX_FLAGS_VLAN              0x00000002
1229 #define IXGB_TX_FLAGS_TSO               0x00000004
1230
1231 static int
1232 ixgb_tso(struct ixgb_adapter *adapter, struct sk_buff *skb)
1233 {
1234         struct ixgb_context_desc *context_desc;
1235         unsigned int i;
1236         u8 ipcss, ipcso, tucss, tucso, hdr_len;
1237         u16 ipcse, tucse, mss;
1238         int err;
1239
1240         if (likely(skb_is_gso(skb))) {
1241                 struct ixgb_buffer *buffer_info;
1242                 struct iphdr *iph;
1243
1244                 if (skb_header_cloned(skb)) {
1245                         err = pskb_expand_head(skb, 0, 0, GFP_ATOMIC);
1246                         if (err)
1247                                 return err;
1248                 }
1249
1250                 hdr_len = skb_transport_offset(skb) + tcp_hdrlen(skb);
1251                 mss = skb_shinfo(skb)->gso_size;
1252                 iph = ip_hdr(skb);
1253                 iph->tot_len = 0;
1254                 iph->check = 0;
1255                 tcp_hdr(skb)->check = ~csum_tcpudp_magic(iph->saddr,
1256                                                          iph->daddr, 0,
1257                                                          IPPROTO_TCP, 0);
1258                 ipcss = skb_network_offset(skb);
1259                 ipcso = (void *)&(iph->check) - (void *)skb->data;
1260                 ipcse = skb_transport_offset(skb) - 1;
1261                 tucss = skb_transport_offset(skb);
1262                 tucso = (void *)&(tcp_hdr(skb)->check) - (void *)skb->data;
1263                 tucse = 0;
1264
1265                 i = adapter->tx_ring.next_to_use;
1266                 context_desc = IXGB_CONTEXT_DESC(adapter->tx_ring, i);
1267                 buffer_info = &adapter->tx_ring.buffer_info[i];
1268                 WARN_ON(buffer_info->dma != 0);
1269
1270                 context_desc->ipcss = ipcss;
1271                 context_desc->ipcso = ipcso;
1272                 context_desc->ipcse = cpu_to_le16(ipcse);
1273                 context_desc->tucss = tucss;
1274                 context_desc->tucso = tucso;
1275                 context_desc->tucse = cpu_to_le16(tucse);
1276                 context_desc->mss = cpu_to_le16(mss);
1277                 context_desc->hdr_len = hdr_len;
1278                 context_desc->status = 0;
1279                 context_desc->cmd_type_len = cpu_to_le32(
1280                                                   IXGB_CONTEXT_DESC_TYPE
1281                                                 | IXGB_CONTEXT_DESC_CMD_TSE
1282                                                 | IXGB_CONTEXT_DESC_CMD_IP
1283                                                 | IXGB_CONTEXT_DESC_CMD_TCP
1284                                                 | IXGB_CONTEXT_DESC_CMD_IDE
1285                                                 | (skb->len - (hdr_len)));
1286
1287
1288                 if (++i == adapter->tx_ring.count) i = 0;
1289                 adapter->tx_ring.next_to_use = i;
1290
1291                 return 1;
1292         }
1293
1294         return 0;
1295 }
1296
1297 static bool
1298 ixgb_tx_csum(struct ixgb_adapter *adapter, struct sk_buff *skb)
1299 {
1300         struct ixgb_context_desc *context_desc;
1301         unsigned int i;
1302         u8 css, cso;
1303
1304         if (likely(skb->ip_summed == CHECKSUM_PARTIAL)) {
1305                 struct ixgb_buffer *buffer_info;
1306                 css = skb_checksum_start_offset(skb);
1307                 cso = css + skb->csum_offset;
1308
1309                 i = adapter->tx_ring.next_to_use;
1310                 context_desc = IXGB_CONTEXT_DESC(adapter->tx_ring, i);
1311                 buffer_info = &adapter->tx_ring.buffer_info[i];
1312                 WARN_ON(buffer_info->dma != 0);
1313
1314                 context_desc->tucss = css;
1315                 context_desc->tucso = cso;
1316                 context_desc->tucse = 0;
1317                 /* zero out any previously existing data in one instruction */
1318                 *(u32 *)&(context_desc->ipcss) = 0;
1319                 context_desc->status = 0;
1320                 context_desc->hdr_len = 0;
1321                 context_desc->mss = 0;
1322                 context_desc->cmd_type_len =
1323                         cpu_to_le32(IXGB_CONTEXT_DESC_TYPE
1324                                     | IXGB_TX_DESC_CMD_IDE);
1325
1326                 if (++i == adapter->tx_ring.count) i = 0;
1327                 adapter->tx_ring.next_to_use = i;
1328
1329                 return true;
1330         }
1331
1332         return false;
1333 }
1334
1335 #define IXGB_MAX_TXD_PWR        14
1336 #define IXGB_MAX_DATA_PER_TXD   (1<<IXGB_MAX_TXD_PWR)
1337
1338 static int
1339 ixgb_tx_map(struct ixgb_adapter *adapter, struct sk_buff *skb,
1340             unsigned int first)
1341 {
1342         struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
1343         struct pci_dev *pdev = adapter->pdev;
1344         struct ixgb_buffer *buffer_info;
1345         int len = skb_headlen(skb);
1346         unsigned int offset = 0, size, count = 0, i;
1347         unsigned int mss = skb_shinfo(skb)->gso_size;
1348         unsigned int nr_frags = skb_shinfo(skb)->nr_frags;
1349         unsigned int f;
1350
1351         i = tx_ring->next_to_use;
1352
1353         while (len) {
1354                 buffer_info = &tx_ring->buffer_info[i];
1355                 size = min(len, IXGB_MAX_DATA_PER_TXD);
1356                 /* Workaround for premature desc write-backs
1357                  * in TSO mode.  Append 4-byte sentinel desc */
1358                 if (unlikely(mss && !nr_frags && size == len && size > 8))
1359                         size -= 4;
1360
1361                 buffer_info->length = size;
1362                 WARN_ON(buffer_info->dma != 0);
1363                 buffer_info->time_stamp = jiffies;
1364                 buffer_info->mapped_as_page = false;
1365                 buffer_info->dma = dma_map_single(&pdev->dev,
1366                                                   skb->data + offset,
1367                                                   size, DMA_TO_DEVICE);
1368                 if (dma_mapping_error(&pdev->dev, buffer_info->dma))
1369                         goto dma_error;
1370                 buffer_info->next_to_watch = 0;
1371
1372                 len -= size;
1373                 offset += size;
1374                 count++;
1375                 if (len) {
1376                         i++;
1377                         if (i == tx_ring->count)
1378                                 i = 0;
1379                 }
1380         }
1381
1382         for (f = 0; f < nr_frags; f++) {
1383                 const struct skb_frag_struct *frag;
1384
1385                 frag = &skb_shinfo(skb)->frags[f];
1386                 len = skb_frag_size(frag);
1387                 offset = 0;
1388
1389                 while (len) {
1390                         i++;
1391                         if (i == tx_ring->count)
1392                                 i = 0;
1393
1394                         buffer_info = &tx_ring->buffer_info[i];
1395                         size = min(len, IXGB_MAX_DATA_PER_TXD);
1396
1397                         /* Workaround for premature desc write-backs
1398                          * in TSO mode.  Append 4-byte sentinel desc */
1399                         if (unlikely(mss && (f == (nr_frags - 1))
1400                                      && size == len && size > 8))
1401                                 size -= 4;
1402
1403                         buffer_info->length = size;
1404                         buffer_info->time_stamp = jiffies;
1405                         buffer_info->mapped_as_page = true;
1406                         buffer_info->dma =
1407                                 skb_frag_dma_map(&pdev->dev, frag, offset, size,
1408                                                  DMA_TO_DEVICE);
1409                         if (dma_mapping_error(&pdev->dev, buffer_info->dma))
1410                                 goto dma_error;
1411                         buffer_info->next_to_watch = 0;
1412
1413                         len -= size;
1414                         offset += size;
1415                         count++;
1416                 }
1417         }
1418         tx_ring->buffer_info[i].skb = skb;
1419         tx_ring->buffer_info[first].next_to_watch = i;
1420
1421         return count;
1422
1423 dma_error:
1424         dev_err(&pdev->dev, "TX DMA map failed\n");
1425         buffer_info->dma = 0;
1426         if (count)
1427                 count--;
1428
1429         while (count--) {
1430                 if (i==0)
1431                         i += tx_ring->count;
1432                 i--;
1433                 buffer_info = &tx_ring->buffer_info[i];
1434                 ixgb_unmap_and_free_tx_resource(adapter, buffer_info);
1435         }
1436
1437         return 0;
1438 }
1439
1440 static void
1441 ixgb_tx_queue(struct ixgb_adapter *adapter, int count, int vlan_id,int tx_flags)
1442 {
1443         struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
1444         struct ixgb_tx_desc *tx_desc = NULL;
1445         struct ixgb_buffer *buffer_info;
1446         u32 cmd_type_len = adapter->tx_cmd_type;
1447         u8 status = 0;
1448         u8 popts = 0;
1449         unsigned int i;
1450
1451         if (tx_flags & IXGB_TX_FLAGS_TSO) {
1452                 cmd_type_len |= IXGB_TX_DESC_CMD_TSE;
1453                 popts |= (IXGB_TX_DESC_POPTS_IXSM | IXGB_TX_DESC_POPTS_TXSM);
1454         }
1455
1456         if (tx_flags & IXGB_TX_FLAGS_CSUM)
1457                 popts |= IXGB_TX_DESC_POPTS_TXSM;
1458
1459         if (tx_flags & IXGB_TX_FLAGS_VLAN)
1460                 cmd_type_len |= IXGB_TX_DESC_CMD_VLE;
1461
1462         i = tx_ring->next_to_use;
1463
1464         while (count--) {
1465                 buffer_info = &tx_ring->buffer_info[i];
1466                 tx_desc = IXGB_TX_DESC(*tx_ring, i);
1467                 tx_desc->buff_addr = cpu_to_le64(buffer_info->dma);
1468                 tx_desc->cmd_type_len =
1469                         cpu_to_le32(cmd_type_len | buffer_info->length);
1470                 tx_desc->status = status;
1471                 tx_desc->popts = popts;
1472                 tx_desc->vlan = cpu_to_le16(vlan_id);
1473
1474                 if (++i == tx_ring->count) i = 0;
1475         }
1476
1477         tx_desc->cmd_type_len |=
1478                 cpu_to_le32(IXGB_TX_DESC_CMD_EOP | IXGB_TX_DESC_CMD_RS);
1479
1480         /* Force memory writes to complete before letting h/w
1481          * know there are new descriptors to fetch.  (Only
1482          * applicable for weak-ordered memory model archs,
1483          * such as IA-64). */
1484         wmb();
1485
1486         tx_ring->next_to_use = i;
1487         IXGB_WRITE_REG(&adapter->hw, TDT, i);
1488 }
1489
1490 static int __ixgb_maybe_stop_tx(struct net_device *netdev, int size)
1491 {
1492         struct ixgb_adapter *adapter = netdev_priv(netdev);
1493         struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
1494
1495         netif_stop_queue(netdev);
1496         /* Herbert's original patch had:
1497          *  smp_mb__after_netif_stop_queue();
1498          * but since that doesn't exist yet, just open code it. */
1499         smp_mb();
1500
1501         /* We need to check again in a case another CPU has just
1502          * made room available. */
1503         if (likely(IXGB_DESC_UNUSED(tx_ring) < size))
1504                 return -EBUSY;
1505
1506         /* A reprieve! */
1507         netif_start_queue(netdev);
1508         ++adapter->restart_queue;
1509         return 0;
1510 }
1511
1512 static int ixgb_maybe_stop_tx(struct net_device *netdev,
1513                               struct ixgb_desc_ring *tx_ring, int size)
1514 {
1515         if (likely(IXGB_DESC_UNUSED(tx_ring) >= size))
1516                 return 0;
1517         return __ixgb_maybe_stop_tx(netdev, size);
1518 }
1519
1520
1521 /* Tx Descriptors needed, worst case */
1522 #define TXD_USE_COUNT(S) (((S) >> IXGB_MAX_TXD_PWR) + \
1523                          (((S) & (IXGB_MAX_DATA_PER_TXD - 1)) ? 1 : 0))
1524 #define DESC_NEEDED TXD_USE_COUNT(IXGB_MAX_DATA_PER_TXD) /* skb->date */ + \
1525         MAX_SKB_FRAGS * TXD_USE_COUNT(PAGE_SIZE) + 1 /* for context */ \
1526         + 1 /* one more needed for sentinel TSO workaround */
1527
1528 static netdev_tx_t
1529 ixgb_xmit_frame(struct sk_buff *skb, struct net_device *netdev)
1530 {
1531         struct ixgb_adapter *adapter = netdev_priv(netdev);
1532         unsigned int first;
1533         unsigned int tx_flags = 0;
1534         int vlan_id = 0;
1535         int count = 0;
1536         int tso;
1537
1538         if (test_bit(__IXGB_DOWN, &adapter->flags)) {
1539                 dev_kfree_skb(skb);
1540                 return NETDEV_TX_OK;
1541         }
1542
1543         if (skb->len <= 0) {
1544                 dev_kfree_skb(skb);
1545                 return NETDEV_TX_OK;
1546         }
1547
1548         if (unlikely(ixgb_maybe_stop_tx(netdev, &adapter->tx_ring,
1549                      DESC_NEEDED)))
1550                 return NETDEV_TX_BUSY;
1551
1552         if (vlan_tx_tag_present(skb)) {
1553                 tx_flags |= IXGB_TX_FLAGS_VLAN;
1554                 vlan_id = vlan_tx_tag_get(skb);
1555         }
1556
1557         first = adapter->tx_ring.next_to_use;
1558
1559         tso = ixgb_tso(adapter, skb);
1560         if (tso < 0) {
1561                 dev_kfree_skb(skb);
1562                 return NETDEV_TX_OK;
1563         }
1564
1565         if (likely(tso))
1566                 tx_flags |= IXGB_TX_FLAGS_TSO;
1567         else if (ixgb_tx_csum(adapter, skb))
1568                 tx_flags |= IXGB_TX_FLAGS_CSUM;
1569
1570         count = ixgb_tx_map(adapter, skb, first);
1571
1572         if (count) {
1573                 ixgb_tx_queue(adapter, count, vlan_id, tx_flags);
1574                 /* Make sure there is space in the ring for the next send. */
1575                 ixgb_maybe_stop_tx(netdev, &adapter->tx_ring, DESC_NEEDED);
1576
1577         } else {
1578                 dev_kfree_skb_any(skb);
1579                 adapter->tx_ring.buffer_info[first].time_stamp = 0;
1580                 adapter->tx_ring.next_to_use = first;
1581         }
1582
1583         return NETDEV_TX_OK;
1584 }
1585
1586 /**
1587  * ixgb_tx_timeout - Respond to a Tx Hang
1588  * @netdev: network interface device structure
1589  **/
1590
1591 static void
1592 ixgb_tx_timeout(struct net_device *netdev)
1593 {
1594         struct ixgb_adapter *adapter = netdev_priv(netdev);
1595
1596         /* Do the reset outside of interrupt context */
1597         schedule_work(&adapter->tx_timeout_task);
1598 }
1599
1600 static void
1601 ixgb_tx_timeout_task(struct work_struct *work)
1602 {
1603         struct ixgb_adapter *adapter =
1604                 container_of(work, struct ixgb_adapter, tx_timeout_task);
1605
1606         adapter->tx_timeout_count++;
1607         ixgb_down(adapter, true);
1608         ixgb_up(adapter);
1609 }
1610
1611 /**
1612  * ixgb_get_stats - Get System Network Statistics
1613  * @netdev: network interface device structure
1614  *
1615  * Returns the address of the device statistics structure.
1616  * The statistics are actually updated from the timer callback.
1617  **/
1618
1619 static struct net_device_stats *
1620 ixgb_get_stats(struct net_device *netdev)
1621 {
1622         return &netdev->stats;
1623 }
1624
1625 /**
1626  * ixgb_change_mtu - Change the Maximum Transfer Unit
1627  * @netdev: network interface device structure
1628  * @new_mtu: new value for maximum frame size
1629  *
1630  * Returns 0 on success, negative on failure
1631  **/
1632
1633 static int
1634 ixgb_change_mtu(struct net_device *netdev, int new_mtu)
1635 {
1636         struct ixgb_adapter *adapter = netdev_priv(netdev);
1637         int max_frame = new_mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;
1638         int old_max_frame = netdev->mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;
1639
1640         /* MTU < 68 is an error for IPv4 traffic, just don't allow it */
1641         if ((new_mtu < 68) ||
1642             (max_frame > IXGB_MAX_JUMBO_FRAME_SIZE + ENET_FCS_LENGTH)) {
1643                 netif_err(adapter, probe, adapter->netdev,
1644                           "Invalid MTU setting %d\n", new_mtu);
1645                 return -EINVAL;
1646         }
1647
1648         if (old_max_frame == max_frame)
1649                 return 0;
1650
1651         if (netif_running(netdev))
1652                 ixgb_down(adapter, true);
1653
1654         adapter->rx_buffer_len = max_frame + 8; /* + 8 for errata */
1655
1656         netdev->mtu = new_mtu;
1657
1658         if (netif_running(netdev))
1659                 ixgb_up(adapter);
1660
1661         return 0;
1662 }
1663
1664 /**
1665  * ixgb_update_stats - Update the board statistics counters.
1666  * @adapter: board private structure
1667  **/
1668
1669 void
1670 ixgb_update_stats(struct ixgb_adapter *adapter)
1671 {
1672         struct net_device *netdev = adapter->netdev;
1673         struct pci_dev *pdev = adapter->pdev;
1674
1675         /* Prevent stats update while adapter is being reset */
1676         if (pci_channel_offline(pdev))
1677                 return;
1678
1679         if ((netdev->flags & IFF_PROMISC) || (netdev->flags & IFF_ALLMULTI) ||
1680            (netdev_mc_count(netdev) > IXGB_MAX_NUM_MULTICAST_ADDRESSES)) {
1681                 u64 multi = IXGB_READ_REG(&adapter->hw, MPRCL);
1682                 u32 bcast_l = IXGB_READ_REG(&adapter->hw, BPRCL);
1683                 u32 bcast_h = IXGB_READ_REG(&adapter->hw, BPRCH);
1684                 u64 bcast = ((u64)bcast_h << 32) | bcast_l;
1685
1686                 multi |= ((u64)IXGB_READ_REG(&adapter->hw, MPRCH) << 32);
1687                 /* fix up multicast stats by removing broadcasts */
1688                 if (multi >= bcast)
1689                         multi -= bcast;
1690
1691                 adapter->stats.mprcl += (multi & 0xFFFFFFFF);
1692                 adapter->stats.mprch += (multi >> 32);
1693                 adapter->stats.bprcl += bcast_l;
1694                 adapter->stats.bprch += bcast_h;
1695         } else {
1696                 adapter->stats.mprcl += IXGB_READ_REG(&adapter->hw, MPRCL);
1697                 adapter->stats.mprch += IXGB_READ_REG(&adapter->hw, MPRCH);
1698                 adapter->stats.bprcl += IXGB_READ_REG(&adapter->hw, BPRCL);
1699                 adapter->stats.bprch += IXGB_READ_REG(&adapter->hw, BPRCH);
1700         }
1701         adapter->stats.tprl += IXGB_READ_REG(&adapter->hw, TPRL);
1702         adapter->stats.tprh += IXGB_READ_REG(&adapter->hw, TPRH);
1703         adapter->stats.gprcl += IXGB_READ_REG(&adapter->hw, GPRCL);
1704         adapter->stats.gprch += IXGB_READ_REG(&adapter->hw, GPRCH);
1705         adapter->stats.uprcl += IXGB_READ_REG(&adapter->hw, UPRCL);
1706         adapter->stats.uprch += IXGB_READ_REG(&adapter->hw, UPRCH);
1707         adapter->stats.vprcl += IXGB_READ_REG(&adapter->hw, VPRCL);
1708         adapter->stats.vprch += IXGB_READ_REG(&adapter->hw, VPRCH);
1709         adapter->stats.jprcl += IXGB_READ_REG(&adapter->hw, JPRCL);
1710         adapter->stats.jprch += IXGB_READ_REG(&adapter->hw, JPRCH);
1711         adapter->stats.gorcl += IXGB_READ_REG(&adapter->hw, GORCL);
1712         adapter->stats.gorch += IXGB_READ_REG(&adapter->hw, GORCH);
1713         adapter->stats.torl += IXGB_READ_REG(&adapter->hw, TORL);
1714         adapter->stats.torh += IXGB_READ_REG(&adapter->hw, TORH);
1715         adapter->stats.rnbc += IXGB_READ_REG(&adapter->hw, RNBC);
1716         adapter->stats.ruc += IXGB_READ_REG(&adapter->hw, RUC);
1717         adapter->stats.roc += IXGB_READ_REG(&adapter->hw, ROC);
1718         adapter->stats.rlec += IXGB_READ_REG(&adapter->hw, RLEC);
1719         adapter->stats.crcerrs += IXGB_READ_REG(&adapter->hw, CRCERRS);
1720         adapter->stats.icbc += IXGB_READ_REG(&adapter->hw, ICBC);
1721         adapter->stats.ecbc += IXGB_READ_REG(&adapter->hw, ECBC);
1722         adapter->stats.mpc += IXGB_READ_REG(&adapter->hw, MPC);
1723         adapter->stats.tptl += IXGB_READ_REG(&adapter->hw, TPTL);
1724         adapter->stats.tpth += IXGB_READ_REG(&adapter->hw, TPTH);
1725         adapter->stats.gptcl += IXGB_READ_REG(&adapter->hw, GPTCL);
1726         adapter->stats.gptch += IXGB_READ_REG(&adapter->hw, GPTCH);
1727         adapter->stats.bptcl += IXGB_READ_REG(&adapter->hw, BPTCL);
1728         adapter->stats.bptch += IXGB_READ_REG(&adapter->hw, BPTCH);
1729         adapter->stats.mptcl += IXGB_READ_REG(&adapter->hw, MPTCL);
1730         adapter->stats.mptch += IXGB_READ_REG(&adapter->hw, MPTCH);
1731         adapter->stats.uptcl += IXGB_READ_REG(&adapter->hw, UPTCL);
1732         adapter->stats.uptch += IXGB_READ_REG(&adapter->hw, UPTCH);
1733         adapter->stats.vptcl += IXGB_READ_REG(&adapter->hw, VPTCL);
1734         adapter->stats.vptch += IXGB_READ_REG(&adapter->hw, VPTCH);
1735         adapter->stats.jptcl += IXGB_READ_REG(&adapter->hw, JPTCL);
1736         adapter->stats.jptch += IXGB_READ_REG(&adapter->hw, JPTCH);
1737         adapter->stats.gotcl += IXGB_READ_REG(&adapter->hw, GOTCL);
1738         adapter->stats.gotch += IXGB_READ_REG(&adapter->hw, GOTCH);
1739         adapter->stats.totl += IXGB_READ_REG(&adapter->hw, TOTL);
1740         adapter->stats.toth += IXGB_READ_REG(&adapter->hw, TOTH);
1741         adapter->stats.dc += IXGB_READ_REG(&adapter->hw, DC);
1742         adapter->stats.plt64c += IXGB_READ_REG(&adapter->hw, PLT64C);
1743         adapter->stats.tsctc += IXGB_READ_REG(&adapter->hw, TSCTC);
1744         adapter->stats.tsctfc += IXGB_READ_REG(&adapter->hw, TSCTFC);
1745         adapter->stats.ibic += IXGB_READ_REG(&adapter->hw, IBIC);
1746         adapter->stats.rfc += IXGB_READ_REG(&adapter->hw, RFC);
1747         adapter->stats.lfc += IXGB_READ_REG(&adapter->hw, LFC);
1748         adapter->stats.pfrc += IXGB_READ_REG(&adapter->hw, PFRC);
1749         adapter->stats.pftc += IXGB_READ_REG(&adapter->hw, PFTC);
1750         adapter->stats.mcfrc += IXGB_READ_REG(&adapter->hw, MCFRC);
1751         adapter->stats.mcftc += IXGB_READ_REG(&adapter->hw, MCFTC);
1752         adapter->stats.xonrxc += IXGB_READ_REG(&adapter->hw, XONRXC);
1753         adapter->stats.xontxc += IXGB_READ_REG(&adapter->hw, XONTXC);
1754         adapter->stats.xoffrxc += IXGB_READ_REG(&adapter->hw, XOFFRXC);
1755         adapter->stats.xofftxc += IXGB_READ_REG(&adapter->hw, XOFFTXC);
1756         adapter->stats.rjc += IXGB_READ_REG(&adapter->hw, RJC);
1757
1758         /* Fill out the OS statistics structure */
1759
1760         netdev->stats.rx_packets = adapter->stats.gprcl;
1761         netdev->stats.tx_packets = adapter->stats.gptcl;
1762         netdev->stats.rx_bytes = adapter->stats.gorcl;
1763         netdev->stats.tx_bytes = adapter->stats.gotcl;
1764         netdev->stats.multicast = adapter->stats.mprcl;
1765         netdev->stats.collisions = 0;
1766
1767         /* ignore RLEC as it reports errors for padded (<64bytes) frames
1768          * with a length in the type/len field */
1769         netdev->stats.rx_errors =
1770             /* adapter->stats.rnbc + */ adapter->stats.crcerrs +
1771             adapter->stats.ruc +
1772             adapter->stats.roc /*+ adapter->stats.rlec */  +
1773             adapter->stats.icbc +
1774             adapter->stats.ecbc + adapter->stats.mpc;
1775
1776         /* see above
1777          * netdev->stats.rx_length_errors = adapter->stats.rlec;
1778          */
1779
1780         netdev->stats.rx_crc_errors = adapter->stats.crcerrs;
1781         netdev->stats.rx_fifo_errors = adapter->stats.mpc;
1782         netdev->stats.rx_missed_errors = adapter->stats.mpc;
1783         netdev->stats.rx_over_errors = adapter->stats.mpc;
1784
1785         netdev->stats.tx_errors = 0;
1786         netdev->stats.rx_frame_errors = 0;
1787         netdev->stats.tx_aborted_errors = 0;
1788         netdev->stats.tx_carrier_errors = 0;
1789         netdev->stats.tx_fifo_errors = 0;
1790         netdev->stats.tx_heartbeat_errors = 0;
1791         netdev->stats.tx_window_errors = 0;
1792 }
1793
1794 #define IXGB_MAX_INTR 10
1795 /**
1796  * ixgb_intr - Interrupt Handler
1797  * @irq: interrupt number
1798  * @data: pointer to a network interface device structure
1799  **/
1800
1801 static irqreturn_t
1802 ixgb_intr(int irq, void *data)
1803 {
1804         struct net_device *netdev = data;
1805         struct ixgb_adapter *adapter = netdev_priv(netdev);
1806         struct ixgb_hw *hw = &adapter->hw;
1807         u32 icr = IXGB_READ_REG(hw, ICR);
1808
1809         if (unlikely(!icr))
1810                 return IRQ_NONE;  /* Not our interrupt */
1811
1812         if (unlikely(icr & (IXGB_INT_RXSEQ | IXGB_INT_LSC)))
1813                 if (!test_bit(__IXGB_DOWN, &adapter->flags))
1814                         mod_timer(&adapter->watchdog_timer, jiffies);
1815
1816         if (napi_schedule_prep(&adapter->napi)) {
1817
1818                 /* Disable interrupts and register for poll. The flush
1819                   of the posted write is intentionally left out.
1820                 */
1821
1822                 IXGB_WRITE_REG(&adapter->hw, IMC, ~0);
1823                 __napi_schedule(&adapter->napi);
1824         }
1825         return IRQ_HANDLED;
1826 }
1827
1828 /**
1829  * ixgb_clean - NAPI Rx polling callback
1830  * @adapter: board private structure
1831  **/
1832
1833 static int
1834 ixgb_clean(struct napi_struct *napi, int budget)
1835 {
1836         struct ixgb_adapter *adapter = container_of(napi, struct ixgb_adapter, napi);
1837         int work_done = 0;
1838
1839         ixgb_clean_tx_irq(adapter);
1840         ixgb_clean_rx_irq(adapter, &work_done, budget);
1841
1842         /* If budget not fully consumed, exit the polling mode */
1843         if (work_done < budget) {
1844                 napi_complete(napi);
1845                 if (!test_bit(__IXGB_DOWN, &adapter->flags))
1846                         ixgb_irq_enable(adapter);
1847         }
1848
1849         return work_done;
1850 }
1851
1852 /**
1853  * ixgb_clean_tx_irq - Reclaim resources after transmit completes
1854  * @adapter: board private structure
1855  **/
1856
1857 static bool
1858 ixgb_clean_tx_irq(struct ixgb_adapter *adapter)
1859 {
1860         struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
1861         struct net_device *netdev = adapter->netdev;
1862         struct ixgb_tx_desc *tx_desc, *eop_desc;
1863         struct ixgb_buffer *buffer_info;
1864         unsigned int i, eop;
1865         bool cleaned = false;
1866
1867         i = tx_ring->next_to_clean;
1868         eop = tx_ring->buffer_info[i].next_to_watch;
1869         eop_desc = IXGB_TX_DESC(*tx_ring, eop);
1870
1871         while (eop_desc->status & IXGB_TX_DESC_STATUS_DD) {
1872
1873                 rmb(); /* read buffer_info after eop_desc */
1874                 for (cleaned = false; !cleaned; ) {
1875                         tx_desc = IXGB_TX_DESC(*tx_ring, i);
1876                         buffer_info = &tx_ring->buffer_info[i];
1877
1878                         if (tx_desc->popts &
1879                            (IXGB_TX_DESC_POPTS_TXSM |
1880                             IXGB_TX_DESC_POPTS_IXSM))
1881                                 adapter->hw_csum_tx_good++;
1882
1883                         ixgb_unmap_and_free_tx_resource(adapter, buffer_info);
1884
1885                         *(u32 *)&(tx_desc->status) = 0;
1886
1887                         cleaned = (i == eop);
1888                         if (++i == tx_ring->count) i = 0;
1889                 }
1890
1891                 eop = tx_ring->buffer_info[i].next_to_watch;
1892                 eop_desc = IXGB_TX_DESC(*tx_ring, eop);
1893         }
1894
1895         tx_ring->next_to_clean = i;
1896
1897         if (unlikely(cleaned && netif_carrier_ok(netdev) &&
1898                      IXGB_DESC_UNUSED(tx_ring) >= DESC_NEEDED)) {
1899                 /* Make sure that anybody stopping the queue after this
1900                  * sees the new next_to_clean. */
1901                 smp_mb();
1902
1903                 if (netif_queue_stopped(netdev) &&
1904                     !(test_bit(__IXGB_DOWN, &adapter->flags))) {
1905                         netif_wake_queue(netdev);
1906                         ++adapter->restart_queue;
1907                 }
1908         }
1909
1910         if (adapter->detect_tx_hung) {
1911                 /* detect a transmit hang in hardware, this serializes the
1912                  * check with the clearing of time_stamp and movement of i */
1913                 adapter->detect_tx_hung = false;
1914                 if (tx_ring->buffer_info[eop].time_stamp &&
1915                    time_after(jiffies, tx_ring->buffer_info[eop].time_stamp + HZ)
1916                    && !(IXGB_READ_REG(&adapter->hw, STATUS) &
1917                         IXGB_STATUS_TXOFF)) {
1918                         /* detected Tx unit hang */
1919                         netif_err(adapter, drv, adapter->netdev,
1920                                   "Detected Tx Unit Hang\n"
1921                                   "  TDH                  <%x>\n"
1922                                   "  TDT                  <%x>\n"
1923                                   "  next_to_use          <%x>\n"
1924                                   "  next_to_clean        <%x>\n"
1925                                   "buffer_info[next_to_clean]\n"
1926                                   "  time_stamp           <%lx>\n"
1927                                   "  next_to_watch        <%x>\n"
1928                                   "  jiffies              <%lx>\n"
1929                                   "  next_to_watch.status <%x>\n",
1930                                   IXGB_READ_REG(&adapter->hw, TDH),
1931                                   IXGB_READ_REG(&adapter->hw, TDT),
1932                                   tx_ring->next_to_use,
1933                                   tx_ring->next_to_clean,
1934                                   tx_ring->buffer_info[eop].time_stamp,
1935                                   eop,
1936                                   jiffies,
1937                                   eop_desc->status);
1938                         netif_stop_queue(netdev);
1939                 }
1940         }
1941
1942         return cleaned;
1943 }
1944
1945 /**
1946  * ixgb_rx_checksum - Receive Checksum Offload for 82597.
1947  * @adapter: board private structure
1948  * @rx_desc: receive descriptor
1949  * @sk_buff: socket buffer with received data
1950  **/
1951
1952 static void
1953 ixgb_rx_checksum(struct ixgb_adapter *adapter,
1954                  struct ixgb_rx_desc *rx_desc,
1955                  struct sk_buff *skb)
1956 {
1957         /* Ignore Checksum bit is set OR
1958          * TCP Checksum has not been calculated
1959          */
1960         if ((rx_desc->status & IXGB_RX_DESC_STATUS_IXSM) ||
1961            (!(rx_desc->status & IXGB_RX_DESC_STATUS_TCPCS))) {
1962                 skb_checksum_none_assert(skb);
1963                 return;
1964         }
1965
1966         /* At this point we know the hardware did the TCP checksum */
1967         /* now look at the TCP checksum error bit */
1968         if (rx_desc->errors & IXGB_RX_DESC_ERRORS_TCPE) {
1969                 /* let the stack verify checksum errors */
1970                 skb_checksum_none_assert(skb);
1971                 adapter->hw_csum_rx_error++;
1972         } else {
1973                 /* TCP checksum is good */
1974                 skb->ip_summed = CHECKSUM_UNNECESSARY;
1975                 adapter->hw_csum_rx_good++;
1976         }
1977 }
1978
1979 /*
1980  * this should improve performance for small packets with large amounts
1981  * of reassembly being done in the stack
1982  */
1983 static void ixgb_check_copybreak(struct net_device *netdev,
1984                                  struct ixgb_buffer *buffer_info,
1985                                  u32 length, struct sk_buff **skb)
1986 {
1987         struct sk_buff *new_skb;
1988
1989         if (length > copybreak)
1990                 return;
1991
1992         new_skb = netdev_alloc_skb_ip_align(netdev, length);
1993         if (!new_skb)
1994                 return;
1995
1996         skb_copy_to_linear_data_offset(new_skb, -NET_IP_ALIGN,
1997                                        (*skb)->data - NET_IP_ALIGN,
1998                                        length + NET_IP_ALIGN);
1999         /* save the skb in buffer_info as good */
2000         buffer_info->skb = *skb;
2001         *skb = new_skb;
2002 }
2003
2004 /**
2005  * ixgb_clean_rx_irq - Send received data up the network stack,
2006  * @adapter: board private structure
2007  **/
2008
2009 static bool
2010 ixgb_clean_rx_irq(struct ixgb_adapter *adapter, int *work_done, int work_to_do)
2011 {
2012         struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
2013         struct net_device *netdev = adapter->netdev;
2014         struct pci_dev *pdev = adapter->pdev;
2015         struct ixgb_rx_desc *rx_desc, *next_rxd;
2016         struct ixgb_buffer *buffer_info, *next_buffer, *next2_buffer;
2017         u32 length;
2018         unsigned int i, j;
2019         int cleaned_count = 0;
2020         bool cleaned = false;
2021
2022         i = rx_ring->next_to_clean;
2023         rx_desc = IXGB_RX_DESC(*rx_ring, i);
2024         buffer_info = &rx_ring->buffer_info[i];
2025
2026         while (rx_desc->status & IXGB_RX_DESC_STATUS_DD) {
2027                 struct sk_buff *skb;
2028                 u8 status;
2029
2030                 if (*work_done >= work_to_do)
2031                         break;
2032
2033                 (*work_done)++;
2034                 rmb();  /* read descriptor and rx_buffer_info after status DD */
2035                 status = rx_desc->status;
2036                 skb = buffer_info->skb;
2037                 buffer_info->skb = NULL;
2038
2039                 prefetch(skb->data - NET_IP_ALIGN);
2040
2041                 if (++i == rx_ring->count)
2042                         i = 0;
2043                 next_rxd = IXGB_RX_DESC(*rx_ring, i);
2044                 prefetch(next_rxd);
2045
2046                 j = i + 1;
2047                 if (j == rx_ring->count)
2048                         j = 0;
2049                 next2_buffer = &rx_ring->buffer_info[j];
2050                 prefetch(next2_buffer);
2051
2052                 next_buffer = &rx_ring->buffer_info[i];
2053
2054                 cleaned = true;
2055                 cleaned_count++;
2056
2057                 dma_unmap_single(&pdev->dev,
2058                                  buffer_info->dma,
2059                                  buffer_info->length,
2060                                  DMA_FROM_DEVICE);
2061                 buffer_info->dma = 0;
2062
2063                 length = le16_to_cpu(rx_desc->length);
2064                 rx_desc->length = 0;
2065
2066                 if (unlikely(!(status & IXGB_RX_DESC_STATUS_EOP))) {
2067
2068                         /* All receives must fit into a single buffer */
2069
2070                         pr_debug("Receive packet consumed multiple buffers length<%x>\n",
2071                                  length);
2072
2073                         dev_kfree_skb_irq(skb);
2074                         goto rxdesc_done;
2075                 }
2076
2077                 if (unlikely(rx_desc->errors &
2078                     (IXGB_RX_DESC_ERRORS_CE | IXGB_RX_DESC_ERRORS_SE |
2079                      IXGB_RX_DESC_ERRORS_P | IXGB_RX_DESC_ERRORS_RXE))) {
2080                         dev_kfree_skb_irq(skb);
2081                         goto rxdesc_done;
2082                 }
2083
2084                 ixgb_check_copybreak(netdev, buffer_info, length, &skb);
2085
2086                 /* Good Receive */
2087                 skb_put(skb, length);
2088
2089                 /* Receive Checksum Offload */
2090                 ixgb_rx_checksum(adapter, rx_desc, skb);
2091
2092                 skb->protocol = eth_type_trans(skb, netdev);
2093                 if (status & IXGB_RX_DESC_STATUS_VP)
2094                         __vlan_hwaccel_put_tag(skb,
2095                                                le16_to_cpu(rx_desc->special));
2096
2097                 netif_receive_skb(skb);
2098
2099 rxdesc_done:
2100                 /* clean up descriptor, might be written over by hw */
2101                 rx_desc->status = 0;
2102
2103                 /* return some buffers to hardware, one at a time is too slow */
2104                 if (unlikely(cleaned_count >= IXGB_RX_BUFFER_WRITE)) {
2105                         ixgb_alloc_rx_buffers(adapter, cleaned_count);
2106                         cleaned_count = 0;
2107                 }
2108
2109                 /* use prefetched values */
2110                 rx_desc = next_rxd;
2111                 buffer_info = next_buffer;
2112         }
2113
2114         rx_ring->next_to_clean = i;
2115
2116         cleaned_count = IXGB_DESC_UNUSED(rx_ring);
2117         if (cleaned_count)
2118                 ixgb_alloc_rx_buffers(adapter, cleaned_count);
2119
2120         return cleaned;
2121 }
2122
2123 /**
2124  * ixgb_alloc_rx_buffers - Replace used receive buffers
2125  * @adapter: address of board private structure
2126  **/
2127
2128 static void
2129 ixgb_alloc_rx_buffers(struct ixgb_adapter *adapter, int cleaned_count)
2130 {
2131         struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
2132         struct net_device *netdev = adapter->netdev;
2133         struct pci_dev *pdev = adapter->pdev;
2134         struct ixgb_rx_desc *rx_desc;
2135         struct ixgb_buffer *buffer_info;
2136         struct sk_buff *skb;
2137         unsigned int i;
2138         long cleancount;
2139
2140         i = rx_ring->next_to_use;
2141         buffer_info = &rx_ring->buffer_info[i];
2142         cleancount = IXGB_DESC_UNUSED(rx_ring);
2143
2144
2145         /* leave three descriptors unused */
2146         while (--cleancount > 2 && cleaned_count--) {
2147                 /* recycle! its good for you */
2148                 skb = buffer_info->skb;
2149                 if (skb) {
2150                         skb_trim(skb, 0);
2151                         goto map_skb;
2152                 }
2153
2154                 skb = netdev_alloc_skb_ip_align(netdev, adapter->rx_buffer_len);
2155                 if (unlikely(!skb)) {
2156                         /* Better luck next round */
2157                         adapter->alloc_rx_buff_failed++;
2158                         break;
2159                 }
2160
2161                 buffer_info->skb = skb;
2162                 buffer_info->length = adapter->rx_buffer_len;
2163 map_skb:
2164                 buffer_info->dma = dma_map_single(&pdev->dev,
2165                                                   skb->data,
2166                                                   adapter->rx_buffer_len,
2167                                                   DMA_FROM_DEVICE);
2168
2169                 rx_desc = IXGB_RX_DESC(*rx_ring, i);
2170                 rx_desc->buff_addr = cpu_to_le64(buffer_info->dma);
2171                 /* guarantee DD bit not set now before h/w gets descriptor
2172                  * this is the rest of the workaround for h/w double
2173                  * writeback. */
2174                 rx_desc->status = 0;
2175
2176
2177                 if (++i == rx_ring->count) i = 0;
2178                 buffer_info = &rx_ring->buffer_info[i];
2179         }
2180
2181         if (likely(rx_ring->next_to_use != i)) {
2182                 rx_ring->next_to_use = i;
2183                 if (unlikely(i-- == 0))
2184                         i = (rx_ring->count - 1);
2185
2186                 /* Force memory writes to complete before letting h/w
2187                  * know there are new descriptors to fetch.  (Only
2188                  * applicable for weak-ordered memory model archs, such
2189                  * as IA-64). */
2190                 wmb();
2191                 IXGB_WRITE_REG(&adapter->hw, RDT, i);
2192         }
2193 }
2194
2195 static void
2196 ixgb_vlan_strip_enable(struct ixgb_adapter *adapter)
2197 {
2198         u32 ctrl;
2199
2200         /* enable VLAN tag insert/strip */
2201         ctrl = IXGB_READ_REG(&adapter->hw, CTRL0);
2202         ctrl |= IXGB_CTRL0_VME;
2203         IXGB_WRITE_REG(&adapter->hw, CTRL0, ctrl);
2204 }
2205
2206 static void
2207 ixgb_vlan_strip_disable(struct ixgb_adapter *adapter)
2208 {
2209         u32 ctrl;
2210
2211         /* disable VLAN tag insert/strip */
2212         ctrl = IXGB_READ_REG(&adapter->hw, CTRL0);
2213         ctrl &= ~IXGB_CTRL0_VME;
2214         IXGB_WRITE_REG(&adapter->hw, CTRL0, ctrl);
2215 }
2216
2217 static int
2218 ixgb_vlan_rx_add_vid(struct net_device *netdev, u16 vid)
2219 {
2220         struct ixgb_adapter *adapter = netdev_priv(netdev);
2221         u32 vfta, index;
2222
2223         /* add VID to filter table */
2224
2225         index = (vid >> 5) & 0x7F;
2226         vfta = IXGB_READ_REG_ARRAY(&adapter->hw, VFTA, index);
2227         vfta |= (1 << (vid & 0x1F));
2228         ixgb_write_vfta(&adapter->hw, index, vfta);
2229         set_bit(vid, adapter->active_vlans);
2230
2231         return 0;
2232 }
2233
2234 static int
2235 ixgb_vlan_rx_kill_vid(struct net_device *netdev, u16 vid)
2236 {
2237         struct ixgb_adapter *adapter = netdev_priv(netdev);
2238         u32 vfta, index;
2239
2240         /* remove VID from filter table */
2241
2242         index = (vid >> 5) & 0x7F;
2243         vfta = IXGB_READ_REG_ARRAY(&adapter->hw, VFTA, index);
2244         vfta &= ~(1 << (vid & 0x1F));
2245         ixgb_write_vfta(&adapter->hw, index, vfta);
2246         clear_bit(vid, adapter->active_vlans);
2247
2248         return 0;
2249 }
2250
2251 static void
2252 ixgb_restore_vlan(struct ixgb_adapter *adapter)
2253 {
2254         u16 vid;
2255
2256         for_each_set_bit(vid, adapter->active_vlans, VLAN_N_VID)
2257                 ixgb_vlan_rx_add_vid(adapter->netdev, vid);
2258 }
2259
2260 #ifdef CONFIG_NET_POLL_CONTROLLER
2261 /*
2262  * Polling 'interrupt' - used by things like netconsole to send skbs
2263  * without having to re-enable interrupts. It's not called while
2264  * the interrupt routine is executing.
2265  */
2266
2267 static void ixgb_netpoll(struct net_device *dev)
2268 {
2269         struct ixgb_adapter *adapter = netdev_priv(dev);
2270
2271         disable_irq(adapter->pdev->irq);
2272         ixgb_intr(adapter->pdev->irq, dev);
2273         enable_irq(adapter->pdev->irq);
2274 }
2275 #endif
2276
2277 /**
2278  * ixgb_io_error_detected - called when PCI error is detected
2279  * @pdev:    pointer to pci device with error
2280  * @state:   pci channel state after error
2281  *
2282  * This callback is called by the PCI subsystem whenever
2283  * a PCI bus error is detected.
2284  */
2285 static pci_ers_result_t ixgb_io_error_detected(struct pci_dev *pdev,
2286                                                enum pci_channel_state state)
2287 {
2288         struct net_device *netdev = pci_get_drvdata(pdev);
2289         struct ixgb_adapter *adapter = netdev_priv(netdev);
2290
2291         netif_device_detach(netdev);
2292
2293         if (state == pci_channel_io_perm_failure)
2294                 return PCI_ERS_RESULT_DISCONNECT;
2295
2296         if (netif_running(netdev))
2297                 ixgb_down(adapter, true);
2298
2299         pci_disable_device(pdev);
2300
2301         /* Request a slot reset. */
2302         return PCI_ERS_RESULT_NEED_RESET;
2303 }
2304
2305 /**
2306  * ixgb_io_slot_reset - called after the pci bus has been reset.
2307  * @pdev    pointer to pci device with error
2308  *
2309  * This callback is called after the PCI bus has been reset.
2310  * Basically, this tries to restart the card from scratch.
2311  * This is a shortened version of the device probe/discovery code,
2312  * it resembles the first-half of the ixgb_probe() routine.
2313  */
2314 static pci_ers_result_t ixgb_io_slot_reset(struct pci_dev *pdev)
2315 {
2316         struct net_device *netdev = pci_get_drvdata(pdev);
2317         struct ixgb_adapter *adapter = netdev_priv(netdev);
2318
2319         if (pci_enable_device(pdev)) {
2320                 netif_err(adapter, probe, adapter->netdev,
2321                           "Cannot re-enable PCI device after reset\n");
2322                 return PCI_ERS_RESULT_DISCONNECT;
2323         }
2324
2325         /* Perform card reset only on one instance of the card */
2326         if (0 != PCI_FUNC (pdev->devfn))
2327                 return PCI_ERS_RESULT_RECOVERED;
2328
2329         pci_set_master(pdev);
2330
2331         netif_carrier_off(netdev);
2332         netif_stop_queue(netdev);
2333         ixgb_reset(adapter);
2334
2335         /* Make sure the EEPROM is good */
2336         if (!ixgb_validate_eeprom_checksum(&adapter->hw)) {
2337                 netif_err(adapter, probe, adapter->netdev,
2338                           "After reset, the EEPROM checksum is not valid\n");
2339                 return PCI_ERS_RESULT_DISCONNECT;
2340         }
2341         ixgb_get_ee_mac_addr(&adapter->hw, netdev->dev_addr);
2342         memcpy(netdev->perm_addr, netdev->dev_addr, netdev->addr_len);
2343
2344         if (!is_valid_ether_addr(netdev->perm_addr)) {
2345                 netif_err(adapter, probe, adapter->netdev,
2346                           "After reset, invalid MAC address\n");
2347                 return PCI_ERS_RESULT_DISCONNECT;
2348         }
2349
2350         return PCI_ERS_RESULT_RECOVERED;
2351 }
2352
2353 /**
2354  * ixgb_io_resume - called when its OK to resume normal operations
2355  * @pdev    pointer to pci device with error
2356  *
2357  * The error recovery driver tells us that its OK to resume
2358  * normal operation. Implementation resembles the second-half
2359  * of the ixgb_probe() routine.
2360  */
2361 static void ixgb_io_resume(struct pci_dev *pdev)
2362 {
2363         struct net_device *netdev = pci_get_drvdata(pdev);
2364         struct ixgb_adapter *adapter = netdev_priv(netdev);
2365
2366         pci_set_master(pdev);
2367
2368         if (netif_running(netdev)) {
2369                 if (ixgb_up(adapter)) {
2370                         pr_err("can't bring device back up after reset\n");
2371                         return;
2372                 }
2373         }
2374
2375         netif_device_attach(netdev);
2376         mod_timer(&adapter->watchdog_timer, jiffies);
2377 }
2378
2379 /* ixgb_main.c */