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         {INTEL_VENDOR_ID, IXGB_DEVICE_ID_82597EX,
  58          PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
  59         {INTEL_VENDOR_ID, IXGB_DEVICE_ID_82597EX_CX4,
  60          PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
  61         {INTEL_VENDOR_ID, IXGB_DEVICE_ID_82597EX_SR,
  62          PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
  63         {INTEL_VENDOR_ID, 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 __devexit 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 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   = __devexit_p(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 == SUN_SUBVENDOR_ID)
 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 __devinit
 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         memcpy(netdev->perm_addr, netdev->dev_addr, netdev->addr_len);
 504
 505         if (!is_valid_ether_addr(netdev->perm_addr)) {
 506                 netif_err(adapter, probe, adapter->netdev, "Invalid MAC Address\n");
 507                 err = -EIO;
 508                 goto err_eeprom;
 509         }
 510
 511         adapter->part_num = ixgb_get_ee_pba_number(&adapter->hw);
 512
 513         init_timer(&adapter->watchdog_timer);
 514         adapter->watchdog_timer.function = ixgb_watchdog;
 515         adapter->watchdog_timer.data = (unsigned long)adapter;
 516
 517         INIT_WORK(&adapter->tx_timeout_task, ixgb_tx_timeout_task);
 518
 519         strcpy(netdev->name, "eth%d");
 520         err = register_netdev(netdev);
 521         if (err)
 522                 goto err_register;
 523
 524         /* carrier off reporting is important to ethtool even BEFORE open */
 525         netif_carrier_off(netdev);
 526
 527         netif_info(adapter, probe, adapter->netdev,
 528                    "Intel(R) PRO/10GbE Network Connection\n");
 529         ixgb_check_options(adapter);
 530         /* reset the hardware with the new settings */
 531
 532         ixgb_reset(adapter);
 533
 534         cards_found++;
 535         return 0;
 536
 537 err_register:
 538 err_sw_init:
 539 err_eeprom:
 540         iounmap(adapter->hw.hw_addr);
 541 err_ioremap:
 542         free_netdev(netdev);
 543 err_alloc_etherdev:
 544         pci_release_regions(pdev);
 545 err_request_regions:
 546 err_dma_mask:
 547         pci_disable_device(pdev);
 548         return err;
 549 }
 550
 551 /**
 552  * ixgb_remove - Device Removal Routine
 553  * @pdev: PCI device information struct
 554  *
 555  * ixgb_remove is called by the PCI subsystem to alert the driver
 556  * that it should release a PCI device.  The could be caused by a
 557  * Hot-Plug event, or because the driver is going to be removed from
 558  * memory.
 559  **/
 560
 561 static void __devexit
 562 ixgb_remove(struct pci_dev *pdev)
 563 {
 564         struct net_device *netdev = pci_get_drvdata(pdev);
 565         struct ixgb_adapter *adapter = netdev_priv(netdev);
 566
 567         cancel_work_sync(&adapter->tx_timeout_task);
 568
 569         unregister_netdev(netdev);
 570
 571         iounmap(adapter->hw.hw_addr);
 572         pci_release_regions(pdev);
 573
 574         free_netdev(netdev);
 575         pci_disable_device(pdev);
 576 }
 577
 578 /**
 579  * ixgb_sw_init - Initialize general software structures (struct ixgb_adapter)
 580  * @adapter: board private structure to initialize
 581  *
 582  * ixgb_sw_init initializes the Adapter private data structure.
 583  * Fields are initialized based on PCI device information and
 584  * OS network device settings (MTU size).
 585  **/
 586
 587 static int __devinit
 588 ixgb_sw_init(struct ixgb_adapter *adapter)
 589 {
 590         struct ixgb_hw *hw = &adapter->hw;
 591         struct net_device *netdev = adapter->netdev;
 592         struct pci_dev *pdev = adapter->pdev;
 593
 594         /* PCI config space info */
 595
 596         hw->vendor_id = pdev->vendor;
 597         hw->device_id = pdev->device;
 598         hw->subsystem_vendor_id = pdev->subsystem_vendor;
 599         hw->subsystem_id = pdev->subsystem_device;
 600
 601         hw->max_frame_size = netdev->mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;
 602         adapter->rx_buffer_len = hw->max_frame_size + 8; /* + 8 for errata */
 603
 604         if ((hw->device_id == IXGB_DEVICE_ID_82597EX) ||
 605             (hw->device_id == IXGB_DEVICE_ID_82597EX_CX4) ||
 606             (hw->device_id == IXGB_DEVICE_ID_82597EX_LR) ||
 607             (hw->device_id == IXGB_DEVICE_ID_82597EX_SR))
 608                 hw->mac_type = ixgb_82597;
 609         else {
 610                 /* should never have loaded on this device */
 611                 netif_err(adapter, probe, adapter->netdev, "unsupported device id\n");
 612         }
 613
 614         /* enable flow control to be programmed */
 615         hw->fc.send_xon = 1;
 616
 617         set_bit(__IXGB_DOWN, &adapter->flags);
 618         return 0;
 619 }
 620
 621 /**
 622  * ixgb_open - Called when a network interface is made active
 623  * @netdev: network interface device structure
 624  *
 625  * Returns 0 on success, negative value on failure
 626  *
 627  * The open entry point is called when a network interface is made
 628  * active by the system (IFF_UP).  At this point all resources needed
 629  * for transmit and receive operations are allocated, the interrupt
 630  * handler is registered with the OS, the watchdog timer is started,
 631  * and the stack is notified that the interface is ready.
 632  **/
 633
 634 static int
 635 ixgb_open(struct net_device *netdev)
 636 {
 637         struct ixgb_adapter *adapter = netdev_priv(netdev);
 638         int err;
 639
 640         /* allocate transmit descriptors */
 641         err = ixgb_setup_tx_resources(adapter);
 642         if (err)
 643                 goto err_setup_tx;
 644
 645         netif_carrier_off(netdev);
 646
 647         /* allocate receive descriptors */
 648
 649         err = ixgb_setup_rx_resources(adapter);
 650         if (err)
 651                 goto err_setup_rx;
 652
 653         err = ixgb_up(adapter);
 654         if (err)
 655                 goto err_up;
 656
 657         netif_start_queue(netdev);
 658
 659         return 0;
 660
 661 err_up:
 662         ixgb_free_rx_resources(adapter);
 663 err_setup_rx:
 664         ixgb_free_tx_resources(adapter);
 665 err_setup_tx:
 666         ixgb_reset(adapter);
 667
 668         return err;
 669 }
 670
 671 /**
 672  * ixgb_close - Disables a network interface
 673  * @netdev: network interface device structure
 674  *
 675  * Returns 0, this is not allowed to fail
 676  *
 677  * The close entry point is called when an interface is de-activated
 678  * by the OS.  The hardware is still under the drivers control, but
 679  * needs to be disabled.  A global MAC reset is issued to stop the
 680  * hardware, and all transmit and receive resources are freed.
 681  **/
 682
 683 static int
 684 ixgb_close(struct net_device *netdev)
 685 {
 686         struct ixgb_adapter *adapter = netdev_priv(netdev);
 687
 688         ixgb_down(adapter, true);
 689
 690         ixgb_free_tx_resources(adapter);
 691         ixgb_free_rx_resources(adapter);
 692
 693         return 0;
 694 }
 695
 696 /**
 697  * ixgb_setup_tx_resources - allocate Tx resources (Descriptors)
 698  * @adapter: board private structure
 699  *
 700  * Return 0 on success, negative on failure
 701  **/
 702
 703 int
 704 ixgb_setup_tx_resources(struct ixgb_adapter *adapter)
 705 {
 706         struct ixgb_desc_ring *txdr = &adapter->tx_ring;
 707         struct pci_dev *pdev = adapter->pdev;
 708         int size;
 709
 710         size = sizeof(struct ixgb_buffer) * txdr->count;
 711         txdr->buffer_info = vzalloc(size);
 712         if (!txdr->buffer_info) {
 713                 netif_err(adapter, probe, adapter->netdev,
 714                           "Unable to allocate transmit descriptor ring memory\n");
 715                 return -ENOMEM;
 716         }
 717
 718         /* round up to nearest 4K */
 719
 720         txdr->size = txdr->count * sizeof(struct ixgb_tx_desc);
 721         txdr->size = ALIGN(txdr->size, 4096);
 722
 723         txdr->desc = dma_alloc_coherent(&pdev->dev, txdr->size, &txdr->dma,
 724                                         GFP_KERNEL);
 725         if (!txdr->desc) {
 726                 vfree(txdr->buffer_info);
 727                 netif_err(adapter, probe, adapter->netdev,
 728                           "Unable to allocate transmit descriptor memory\n");
 729                 return -ENOMEM;
 730         }
 731         memset(txdr->desc, 0, txdr->size);
 732
 733         txdr->next_to_use = 0;
 734         txdr->next_to_clean = 0;
 735
 736         return 0;
 737 }
 738
 739 /**
 740  * ixgb_configure_tx - Configure 82597 Transmit Unit after Reset.
 741  * @adapter: board private structure
 742  *
 743  * Configure the Tx unit of the MAC after a reset.
 744  **/
 745
 746 static void
 747 ixgb_configure_tx(struct ixgb_adapter *adapter)
 748 {
 749         u64 tdba = adapter->tx_ring.dma;
 750         u32 tdlen = adapter->tx_ring.count * sizeof(struct ixgb_tx_desc);
 751         u32 tctl;
 752         struct ixgb_hw *hw = &adapter->hw;
 753
 754         /* Setup the Base and Length of the Tx Descriptor Ring
 755          * tx_ring.dma can be either a 32 or 64 bit value
 756          */
 757
 758         IXGB_WRITE_REG(hw, TDBAL, (tdba & 0x00000000ffffffffULL));
 759         IXGB_WRITE_REG(hw, TDBAH, (tdba >> 32));
 760
 761         IXGB_WRITE_REG(hw, TDLEN, tdlen);
 762
 763         /* Setup the HW Tx Head and Tail descriptor pointers */
 764
 765         IXGB_WRITE_REG(hw, TDH, 0);
 766         IXGB_WRITE_REG(hw, TDT, 0);
 767
 768         /* don't set up txdctl, it induces performance problems if configured
 769          * incorrectly */
 770         /* Set the Tx Interrupt Delay register */
 771
 772         IXGB_WRITE_REG(hw, TIDV, adapter->tx_int_delay);
 773
 774         /* Program the Transmit Control Register */
 775
 776         tctl = IXGB_TCTL_TCE | IXGB_TCTL_TXEN | IXGB_TCTL_TPDE;
 777         IXGB_WRITE_REG(hw, TCTL, tctl);
 778
 779         /* Setup Transmit Descriptor Settings for this adapter */
 780         adapter->tx_cmd_type =
 781                 IXGB_TX_DESC_TYPE |
 782                 (adapter->tx_int_delay_enable ? IXGB_TX_DESC_CMD_IDE : 0);
 783 }
 784
 785 /**
 786  * ixgb_setup_rx_resources - allocate Rx resources (Descriptors)
 787  * @adapter: board private structure
 788  *
 789  * Returns 0 on success, negative on failure
 790  **/
 791
 792 int
 793 ixgb_setup_rx_resources(struct ixgb_adapter *adapter)
 794 {
 795         struct ixgb_desc_ring *rxdr = &adapter->rx_ring;
 796         struct pci_dev *pdev = adapter->pdev;
 797         int size;
 798
 799         size = sizeof(struct ixgb_buffer) * rxdr->count;
 800         rxdr->buffer_info = vzalloc(size);
 801         if (!rxdr->buffer_info) {
 802                 netif_err(adapter, probe, adapter->netdev,
 803                           "Unable to allocate receive descriptor ring\n");
 804                 return -ENOMEM;
 805         }
 806
 807         /* Round up to nearest 4K */
 808
 809         rxdr->size = rxdr->count * sizeof(struct ixgb_rx_desc);
 810         rxdr->size = ALIGN(rxdr->size, 4096);
 811
 812         rxdr->desc = dma_alloc_coherent(&pdev->dev, rxdr->size, &rxdr->dma,
 813                                         GFP_KERNEL);
 814
 815         if (!rxdr->desc) {
 816                 vfree(rxdr->buffer_info);
 817                 netif_err(adapter, probe, adapter->netdev,
 818                           "Unable to allocate receive descriptors\n");
 819                 return -ENOMEM;
 820         }
 821         memset(rxdr->desc, 0, rxdr->size);
 822
 823         rxdr->next_to_clean = 0;
 824         rxdr->next_to_use = 0;
 825
 826         return 0;
 827 }
 828
 829 /**
 830  * ixgb_setup_rctl - configure the receive control register
 831  * @adapter: Board private structure
 832  **/
 833
 834 static void
 835 ixgb_setup_rctl(struct ixgb_adapter *adapter)
 836 {
 837         u32 rctl;
 838
 839         rctl = IXGB_READ_REG(&adapter->hw, RCTL);
 840
 841         rctl &= ~(3 << IXGB_RCTL_MO_SHIFT);
 842
 843         rctl |=
 844                 IXGB_RCTL_BAM | IXGB_RCTL_RDMTS_1_2 |
 845                 IXGB_RCTL_RXEN | IXGB_RCTL_CFF |
 846                 (adapter->hw.mc_filter_type << IXGB_RCTL_MO_SHIFT);
 847
 848         rctl |= IXGB_RCTL_SECRC;
 849
 850         if (adapter->rx_buffer_len <= IXGB_RXBUFFER_2048)
 851                 rctl |= IXGB_RCTL_BSIZE_2048;
 852         else if (adapter->rx_buffer_len <= IXGB_RXBUFFER_4096)
 853                 rctl |= IXGB_RCTL_BSIZE_4096;
 854         else if (adapter->rx_buffer_len <= IXGB_RXBUFFER_8192)
 855                 rctl |= IXGB_RCTL_BSIZE_8192;
 856         else if (adapter->rx_buffer_len <= IXGB_RXBUFFER_16384)
 857                 rctl |= IXGB_RCTL_BSIZE_16384;
 858
 859         IXGB_WRITE_REG(&adapter->hw, RCTL, rctl);
 860 }
 861
 862 /**
 863  * ixgb_configure_rx - Configure 82597 Receive Unit after Reset.
 864  * @adapter: board private structure
 865  *
 866  * Configure the Rx unit of the MAC after a reset.
 867  **/
 868
 869 static void
 870 ixgb_configure_rx(struct ixgb_adapter *adapter)
 871 {
 872         u64 rdba = adapter->rx_ring.dma;
 873         u32 rdlen = adapter->rx_ring.count * sizeof(struct ixgb_rx_desc);
 874         struct ixgb_hw *hw = &adapter->hw;
 875         u32 rctl;
 876         u32 rxcsum;
 877
 878         /* make sure receives are disabled while setting up the descriptors */
 879
 880         rctl = IXGB_READ_REG(hw, RCTL);
 881         IXGB_WRITE_REG(hw, RCTL, rctl & ~IXGB_RCTL_RXEN);
 882
 883         /* set the Receive Delay Timer Register */
 884
 885         IXGB_WRITE_REG(hw, RDTR, adapter->rx_int_delay);
 886
 887         /* Setup the Base and Length of the Rx Descriptor Ring */
 888
 889         IXGB_WRITE_REG(hw, RDBAL, (rdba & 0x00000000ffffffffULL));
 890         IXGB_WRITE_REG(hw, RDBAH, (rdba >> 32));
 891
 892         IXGB_WRITE_REG(hw, RDLEN, rdlen);
 893
 894         /* Setup the HW Rx Head and Tail Descriptor Pointers */
 895         IXGB_WRITE_REG(hw, RDH, 0);
 896         IXGB_WRITE_REG(hw, RDT, 0);
 897
 898         /* due to the hardware errata with RXDCTL, we are unable to use any of
 899          * the performance enhancing features of it without causing other
 900          * subtle bugs, some of the bugs could include receive length
 901          * corruption at high data rates (WTHRESH > 0) and/or receive
 902          * descriptor ring irregularites (particularly in hardware cache) */
 903         IXGB_WRITE_REG(hw, RXDCTL, 0);
 904
 905         /* Enable Receive Checksum Offload for TCP and UDP */
 906         if (adapter->rx_csum) {
 907                 rxcsum = IXGB_READ_REG(hw, RXCSUM);
 908                 rxcsum |= IXGB_RXCSUM_TUOFL;
 909                 IXGB_WRITE_REG(hw, RXCSUM, rxcsum);
 910         }
 911
 912         /* Enable Receives */
 913
 914         IXGB_WRITE_REG(hw, RCTL, rctl);
 915 }
 916
 917 /**
 918  * ixgb_free_tx_resources - Free Tx Resources
 919  * @adapter: board private structure
 920  *
 921  * Free all transmit software resources
 922  **/
 923
 924 void
 925 ixgb_free_tx_resources(struct ixgb_adapter *adapter)
 926 {
 927         struct pci_dev *pdev = adapter->pdev;
 928
 929         ixgb_clean_tx_ring(adapter);
 930
 931         vfree(adapter->tx_ring.buffer_info);
 932         adapter->tx_ring.buffer_info = NULL;
 933
 934         dma_free_coherent(&pdev->dev, adapter->tx_ring.size,
 935                           adapter->tx_ring.desc, adapter->tx_ring.dma);
 936
 937         adapter->tx_ring.desc = NULL;
 938 }
 939
 940 static void
 941 ixgb_unmap_and_free_tx_resource(struct ixgb_adapter *adapter,
 942                                 struct ixgb_buffer *buffer_info)
 943 {
 944         if (buffer_info->dma) {
 945                 if (buffer_info->mapped_as_page)
 946                         dma_unmap_page(&adapter->pdev->dev, buffer_info->dma,
 947                                        buffer_info->length, DMA_TO_DEVICE);
 948                 else
 949                         dma_unmap_single(&adapter->pdev->dev, buffer_info->dma,
 950                                          buffer_info->length, DMA_TO_DEVICE);
 951                 buffer_info->dma = 0;
 952         }
 953
 954         if (buffer_info->skb) {
 955                 dev_kfree_skb_any(buffer_info->skb);
 956                 buffer_info->skb = NULL;
 957         }
 958         buffer_info->time_stamp = 0;
 959         /* these fields must always be initialized in tx
 960          * buffer_info->length = 0;
 961          * buffer_info->next_to_watch = 0; */
 962 }
 963
 964 /**
 965  * ixgb_clean_tx_ring - Free Tx Buffers
 966  * @adapter: board private structure
 967  **/
 968
 969 static void
 970 ixgb_clean_tx_ring(struct ixgb_adapter *adapter)
 971 {
 972         struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
 973         struct ixgb_buffer *buffer_info;
 974         unsigned long size;
 975         unsigned int i;
 976
 977         /* Free all the Tx ring sk_buffs */
 978
 979         for (i = 0; i < tx_ring->count; i++) {
 980                 buffer_info = &tx_ring->buffer_info[i];
 981                 ixgb_unmap_and_free_tx_resource(adapter, buffer_info);
 982         }
 983
 984         size = sizeof(struct ixgb_buffer) * tx_ring->count;
 985         memset(tx_ring->buffer_info, 0, size);
 986
 987         /* Zero out the descriptor ring */
 988
 989         memset(tx_ring->desc, 0, tx_ring->size);
 990
 991         tx_ring->next_to_use = 0;
 992         tx_ring->next_to_clean = 0;
 993
 994         IXGB_WRITE_REG(&adapter->hw, TDH, 0);
 995         IXGB_WRITE_REG(&adapter->hw, TDT, 0);
 996 }
 997
 998 /**
 999  * ixgb_free_rx_resources - Free Rx Resources
1000  * @adapter: board private structure
1001  *
1002  * Free all receive software resources
1003  **/
1004
1005 void
1006 ixgb_free_rx_resources(struct ixgb_adapter *adapter)
1007 {
1008         struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
1009         struct pci_dev *pdev = adapter->pdev;
1010
1011         ixgb_clean_rx_ring(adapter);
1012
1013         vfree(rx_ring->buffer_info);
1014         rx_ring->buffer_info = NULL;
1015
1016         dma_free_coherent(&pdev->dev, rx_ring->size, rx_ring->desc,
1017                           rx_ring->dma);
1018
1019         rx_ring->desc = NULL;
1020 }
1021
1022 /**
1023  * ixgb_clean_rx_ring - Free Rx Buffers
1024  * @adapter: board private structure
1025  **/
1026
1027 static void
1028 ixgb_clean_rx_ring(struct ixgb_adapter *adapter)
1029 {
1030         struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
1031         struct ixgb_buffer *buffer_info;
1032         struct pci_dev *pdev = adapter->pdev;
1033         unsigned long size;
1034         unsigned int i;
1035
1036         /* Free all the Rx ring sk_buffs */
1037
1038         for (i = 0; i < rx_ring->count; i++) {
1039                 buffer_info = &rx_ring->buffer_info[i];
1040                 if (buffer_info->dma) {
1041                         dma_unmap_single(&pdev->dev,
1042                                          buffer_info->dma,
1043                                          buffer_info->length,
1044                                          DMA_FROM_DEVICE);
1045                         buffer_info->dma = 0;
1046                         buffer_info->length = 0;
1047                 }
1048
1049                 if (buffer_info->skb) {
1050                         dev_kfree_skb(buffer_info->skb);
1051                         buffer_info->skb = NULL;
1052                 }
1053         }
1054
1055         size = sizeof(struct ixgb_buffer) * rx_ring->count;
1056         memset(rx_ring->buffer_info, 0, size);
1057
1058         /* Zero out the descriptor ring */
1059
1060         memset(rx_ring->desc, 0, rx_ring->size);
1061
1062         rx_ring->next_to_clean = 0;
1063         rx_ring->next_to_use = 0;
1064
1065         IXGB_WRITE_REG(&adapter->hw, RDH, 0);
1066         IXGB_WRITE_REG(&adapter->hw, RDT, 0);
1067 }
1068
1069 /**
1070  * ixgb_set_mac - Change the Ethernet Address of the NIC
1071  * @netdev: network interface device structure
1072  * @p: pointer to an address structure
1073  *
1074  * Returns 0 on success, negative on failure
1075  **/
1076
1077 static int
1078 ixgb_set_mac(struct net_device *netdev, void *p)
1079 {
1080         struct ixgb_adapter *adapter = netdev_priv(netdev);
1081         struct sockaddr *addr = p;
1082
1083         if (!is_valid_ether_addr(addr->sa_data))
1084                 return -EADDRNOTAVAIL;
1085
1086         memcpy(netdev->dev_addr, addr->sa_data, netdev->addr_len);
1087
1088         ixgb_rar_set(&adapter->hw, addr->sa_data, 0);
1089
1090         return 0;
1091 }
1092
1093 /**
1094  * ixgb_set_multi - Multicast and Promiscuous mode set
1095  * @netdev: network interface device structure
1096  *
1097  * The set_multi entry point is called whenever the multicast address
1098  * list or the network interface flags are updated.  This routine is
1099  * responsible for configuring the hardware for proper multicast,
1100  * promiscuous mode, and all-multi behavior.
1101  **/
1102
1103 static void
1104 ixgb_set_multi(struct net_device *netdev)
1105 {
1106         struct ixgb_adapter *adapter = netdev_priv(netdev);
1107         struct ixgb_hw *hw = &adapter->hw;
1108         struct netdev_hw_addr *ha;
1109         u32 rctl;
1110
1111         /* Check for Promiscuous and All Multicast modes */
1112
1113         rctl = IXGB_READ_REG(hw, RCTL);
1114
1115         if (netdev->flags & IFF_PROMISC) {
1116                 rctl |= (IXGB_RCTL_UPE | IXGB_RCTL_MPE);
1117                 /* disable VLAN filtering */
1118                 rctl &= ~IXGB_RCTL_CFIEN;
1119                 rctl &= ~IXGB_RCTL_VFE;
1120         } else {
1121                 if (netdev->flags & IFF_ALLMULTI) {
1122                         rctl |= IXGB_RCTL_MPE;
1123                         rctl &= ~IXGB_RCTL_UPE;
1124                 } else {
1125                         rctl &= ~(IXGB_RCTL_UPE | IXGB_RCTL_MPE);
1126                 }
1127                 /* enable VLAN filtering */
1128                 rctl |= IXGB_RCTL_VFE;
1129                 rctl &= ~IXGB_RCTL_CFIEN;
1130         }
1131
1132         if (netdev_mc_count(netdev) > IXGB_MAX_NUM_MULTICAST_ADDRESSES) {
1133                 rctl |= IXGB_RCTL_MPE;
1134                 IXGB_WRITE_REG(hw, RCTL, rctl);
1135         } else {
1136                 u8 *mta = kmalloc(IXGB_MAX_NUM_MULTICAST_ADDRESSES *
1137                               ETH_ALEN, GFP_ATOMIC);
1138                 u8 *addr;
1139                 if (!mta)
1140                         goto alloc_failed;
1141
1142                 IXGB_WRITE_REG(hw, RCTL, rctl);
1143
1144                 addr = mta;
1145                 netdev_for_each_mc_addr(ha, netdev) {
1146                         memcpy(addr, ha->addr, ETH_ALEN);
1147                         addr += ETH_ALEN;
1148                 }
1149
1150                 ixgb_mc_addr_list_update(hw, mta, netdev_mc_count(netdev), 0);
1151                 kfree(mta);
1152         }
1153
1154 alloc_failed:
1155         if (netdev->features & NETIF_F_HW_VLAN_RX)
1156                 ixgb_vlan_strip_enable(adapter);
1157         else
1158                 ixgb_vlan_strip_disable(adapter);
1159
1160 }
1161
1162 /**
1163  * ixgb_watchdog - Timer Call-back
1164  * @data: pointer to netdev cast into an unsigned long
1165  **/
1166
1167 static void
1168 ixgb_watchdog(unsigned long data)
1169 {
1170         struct ixgb_adapter *adapter = (struct ixgb_adapter *)data;
1171         struct net_device *netdev = adapter->netdev;
1172         struct ixgb_desc_ring *txdr = &adapter->tx_ring;
1173
1174         ixgb_check_for_link(&adapter->hw);
1175
1176         if (ixgb_check_for_bad_link(&adapter->hw)) {
1177                 /* force the reset path */
1178                 netif_stop_queue(netdev);
1179         }
1180
1181         if (adapter->hw.link_up) {
1182                 if (!netif_carrier_ok(netdev)) {
1183                         netdev_info(netdev,
1184                                     "NIC Link is Up 10 Gbps Full Duplex, Flow Control: %s\n",
1185                                     (adapter->hw.fc.type == ixgb_fc_full) ?
1186                                     "RX/TX" :
1187                                     (adapter->hw.fc.type == ixgb_fc_rx_pause) ?
1188                                      "RX" :
1189                                     (adapter->hw.fc.type == ixgb_fc_tx_pause) ?
1190                                     "TX" : "None");
1191                         adapter->link_speed = 10000;
1192                         adapter->link_duplex = FULL_DUPLEX;
1193                         netif_carrier_on(netdev);
1194                 }
1195         } else {
1196                 if (netif_carrier_ok(netdev)) {
1197                         adapter->link_speed = 0;
1198                         adapter->link_duplex = 0;
1199                         netdev_info(netdev, "NIC Link is Down\n");
1200                         netif_carrier_off(netdev);
1201                 }
1202         }
1203
1204         ixgb_update_stats(adapter);
1205
1206         if (!netif_carrier_ok(netdev)) {
1207                 if (IXGB_DESC_UNUSED(txdr) + 1 < txdr->count) {
1208                         /* We've lost link, so the controller stops DMA,
1209                          * but we've got queued Tx work that's never going
1210                          * to get done, so reset controller to flush Tx.
1211                          * (Do the reset outside of interrupt context). */
1212                         schedule_work(&adapter->tx_timeout_task);
1213                         /* return immediately since reset is imminent */
1214                         return;
1215                 }
1216         }
1217
1218         /* Force detection of hung controller every watchdog period */
1219         adapter->detect_tx_hung = true;
1220
1221         /* generate an interrupt to force clean up of any stragglers */
1222         IXGB_WRITE_REG(&adapter->hw, ICS, IXGB_INT_TXDW);
1223
1224         /* Reset the timer */
1225         mod_timer(&adapter->watchdog_timer, jiffies + 2 * HZ);
1226 }
1227
1228 #define IXGB_TX_FLAGS_CSUM              0x00000001
1229 #define IXGB_TX_FLAGS_VLAN              0x00000002
1230 #define IXGB_TX_FLAGS_TSO               0x00000004
1231
1232 static int
1233 ixgb_tso(struct ixgb_adapter *adapter, struct sk_buff *skb)
1234 {
1235         struct ixgb_context_desc *context_desc;
1236         unsigned int i;
1237         u8 ipcss, ipcso, tucss, tucso, hdr_len;
1238         u16 ipcse, tucse, mss;
1239         int err;
1240
1241         if (likely(skb_is_gso(skb))) {
1242                 struct ixgb_buffer *buffer_info;
1243                 struct iphdr *iph;
1244
1245                 if (skb_header_cloned(skb)) {
1246                         err = pskb_expand_head(skb, 0, 0, GFP_ATOMIC);
1247                         if (err)
1248                                 return err;
1249                 }
1250
1251                 hdr_len = skb_transport_offset(skb) + tcp_hdrlen(skb);
1252                 mss = skb_shinfo(skb)->gso_size;
1253                 iph = ip_hdr(skb);
1254                 iph->tot_len = 0;
1255                 iph->check = 0;
1256                 tcp_hdr(skb)->check = ~csum_tcpudp_magic(iph->saddr,
1257                                                          iph->daddr, 0,
1258                                                          IPPROTO_TCP, 0);
1259                 ipcss = skb_network_offset(skb);
1260                 ipcso = (void *)&(iph->check) - (void *)skb->data;
1261                 ipcse = skb_transport_offset(skb) - 1;
1262                 tucss = skb_transport_offset(skb);
1263                 tucso = (void *)&(tcp_hdr(skb)->check) - (void *)skb->data;
1264                 tucse = 0;
1265
1266                 i = adapter->tx_ring.next_to_use;
1267                 context_desc = IXGB_CONTEXT_DESC(adapter->tx_ring, i);
1268                 buffer_info = &adapter->tx_ring.buffer_info[i];
1269                 WARN_ON(buffer_info->dma != 0);
1270
1271                 context_desc->ipcss = ipcss;
1272                 context_desc->ipcso = ipcso;
1273                 context_desc->ipcse = cpu_to_le16(ipcse);
1274                 context_desc->tucss = tucss;
1275                 context_desc->tucso = tucso;
1276                 context_desc->tucse = cpu_to_le16(tucse);
1277                 context_desc->mss = cpu_to_le16(mss);
1278                 context_desc->hdr_len = hdr_len;
1279                 context_desc->status = 0;
1280                 context_desc->cmd_type_len = cpu_to_le32(
1281                                                   IXGB_CONTEXT_DESC_TYPE
1282                                                 | IXGB_CONTEXT_DESC_CMD_TSE
1283                                                 | IXGB_CONTEXT_DESC_CMD_IP
1284                                                 | IXGB_CONTEXT_DESC_CMD_TCP
1285                                                 | IXGB_CONTEXT_DESC_CMD_IDE
1286                                                 | (skb->len - (hdr_len)));
1287
1288
1289                 if (++i == adapter->tx_ring.count) i = 0;
1290                 adapter->tx_ring.next_to_use = i;
1291
1292                 return 1;
1293         }
1294
1295         return 0;
1296 }
1297
1298 static bool
1299 ixgb_tx_csum(struct ixgb_adapter *adapter, struct sk_buff *skb)
1300 {
1301         struct ixgb_context_desc *context_desc;
1302         unsigned int i;
1303         u8 css, cso;
1304
1305         if (likely(skb->ip_summed == CHECKSUM_PARTIAL)) {
1306                 struct ixgb_buffer *buffer_info;
1307                 css = skb_checksum_start_offset(skb);
1308                 cso = css + skb->csum_offset;
1309
1310                 i = adapter->tx_ring.next_to_use;
1311                 context_desc = IXGB_CONTEXT_DESC(adapter->tx_ring, i);
1312                 buffer_info = &adapter->tx_ring.buffer_info[i];
1313                 WARN_ON(buffer_info->dma != 0);
1314
1315                 context_desc->tucss = css;
1316                 context_desc->tucso = cso;
1317                 context_desc->tucse = 0;
1318                 /* zero out any previously existing data in one instruction */
1319                 *(u32 *)&(context_desc->ipcss) = 0;
1320                 context_desc->status = 0;
1321                 context_desc->hdr_len = 0;
1322                 context_desc->mss = 0;
1323                 context_desc->cmd_type_len =
1324                         cpu_to_le32(IXGB_CONTEXT_DESC_TYPE
1325                                     | IXGB_TX_DESC_CMD_IDE);
1326
1327                 if (++i == adapter->tx_ring.count) i = 0;
1328                 adapter->tx_ring.next_to_use = i;
1329
1330                 return true;
1331         }
1332
1333         return false;
1334 }
1335
1336 #define IXGB_MAX_TXD_PWR        14
1337 #define IXGB_MAX_DATA_PER_TXD   (1<<IXGB_MAX_TXD_PWR)
1338
1339 static int
1340 ixgb_tx_map(struct ixgb_adapter *adapter, struct sk_buff *skb,
1341             unsigned int first)
1342 {
1343         struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
1344         struct pci_dev *pdev = adapter->pdev;
1345         struct ixgb_buffer *buffer_info;
1346         int len = skb_headlen(skb);
1347         unsigned int offset = 0, size, count = 0, i;
1348         unsigned int mss = skb_shinfo(skb)->gso_size;
1349         unsigned int nr_frags = skb_shinfo(skb)->nr_frags;
1350         unsigned int f;
1351
1352         i = tx_ring->next_to_use;
1353
1354         while (len) {
1355                 buffer_info = &tx_ring->buffer_info[i];
1356                 size = min(len, IXGB_MAX_DATA_PER_TXD);
1357                 /* Workaround for premature desc write-backs
1358                  * in TSO mode.  Append 4-byte sentinel desc */
1359                 if (unlikely(mss && !nr_frags && size == len && size > 8))
1360                         size -= 4;
1361
1362                 buffer_info->length = size;
1363                 WARN_ON(buffer_info->dma != 0);
1364                 buffer_info->time_stamp = jiffies;
1365                 buffer_info->mapped_as_page = false;
1366                 buffer_info->dma = dma_map_single(&pdev->dev,
1367                                                   skb->data + offset,
1368                                                   size, DMA_TO_DEVICE);
1369                 if (dma_mapping_error(&pdev->dev, buffer_info->dma))
1370                         goto dma_error;
1371                 buffer_info->next_to_watch = 0;
1372
1373                 len -= size;
1374                 offset += size;
1375                 count++;
1376                 if (len) {
1377                         i++;
1378                         if (i == tx_ring->count)
1379                                 i = 0;
1380                 }
1381         }
1382
1383         for (f = 0; f < nr_frags; f++) {
1384                 const struct skb_frag_struct *frag;
1385
1386                 frag = &skb_shinfo(skb)->frags[f];
1387                 len = skb_frag_size(frag);
1388                 offset = 0;
1389
1390                 while (len) {
1391                         i++;
1392                         if (i == tx_ring->count)
1393                                 i = 0;
1394
1395                         buffer_info = &tx_ring->buffer_info[i];
1396                         size = min(len, IXGB_MAX_DATA_PER_TXD);
1397
1398                         /* Workaround for premature desc write-backs
1399                          * in TSO mode.  Append 4-byte sentinel desc */
1400                         if (unlikely(mss && (f == (nr_frags - 1))
1401                                      && size == len && size > 8))
1402                                 size -= 4;
1403
1404                         buffer_info->length = size;
1405                         buffer_info->time_stamp = jiffies;
1406                         buffer_info->mapped_as_page = true;
1407                         buffer_info->dma =
1408                                 skb_frag_dma_map(&pdev->dev, frag, offset, size,
1409                                                  DMA_TO_DEVICE);
1410                         if (dma_mapping_error(&pdev->dev, buffer_info->dma))
1411                                 goto dma_error;
1412                         buffer_info->next_to_watch = 0;
1413
1414                         len -= size;
1415                         offset += size;
1416                         count++;
1417                 }
1418         }
1419         tx_ring->buffer_info[i].skb = skb;
1420         tx_ring->buffer_info[first].next_to_watch = i;
1421
1422         return count;
1423
1424 dma_error:
1425         dev_err(&pdev->dev, "TX DMA map failed\n");
1426         buffer_info->dma = 0;
1427         if (count)
1428                 count--;
1429
1430         while (count--) {
1431                 if (i==0)
1432                         i += tx_ring->count;
1433                 i--;
1434                 buffer_info = &tx_ring->buffer_info[i];
1435                 ixgb_unmap_and_free_tx_resource(adapter, buffer_info);
1436         }
1437
1438         return 0;
1439 }
1440
1441 static void
1442 ixgb_tx_queue(struct ixgb_adapter *adapter, int count, int vlan_id,int tx_flags)
1443 {
1444         struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
1445         struct ixgb_tx_desc *tx_desc = NULL;
1446         struct ixgb_buffer *buffer_info;
1447         u32 cmd_type_len = adapter->tx_cmd_type;
1448         u8 status = 0;
1449         u8 popts = 0;
1450         unsigned int i;
1451
1452         if (tx_flags & IXGB_TX_FLAGS_TSO) {
1453                 cmd_type_len |= IXGB_TX_DESC_CMD_TSE;
1454                 popts |= (IXGB_TX_DESC_POPTS_IXSM | IXGB_TX_DESC_POPTS_TXSM);
1455         }
1456
1457         if (tx_flags & IXGB_TX_FLAGS_CSUM)
1458                 popts |= IXGB_TX_DESC_POPTS_TXSM;
1459
1460         if (tx_flags & IXGB_TX_FLAGS_VLAN)
1461                 cmd_type_len |= IXGB_TX_DESC_CMD_VLE;
1462
1463         i = tx_ring->next_to_use;
1464
1465         while (count--) {
1466                 buffer_info = &tx_ring->buffer_info[i];
1467                 tx_desc = IXGB_TX_DESC(*tx_ring, i);
1468                 tx_desc->buff_addr = cpu_to_le64(buffer_info->dma);
1469                 tx_desc->cmd_type_len =
1470                         cpu_to_le32(cmd_type_len | buffer_info->length);
1471                 tx_desc->status = status;
1472                 tx_desc->popts = popts;
1473                 tx_desc->vlan = cpu_to_le16(vlan_id);
1474
1475                 if (++i == tx_ring->count) i = 0;
1476         }
1477
1478         tx_desc->cmd_type_len |=
1479                 cpu_to_le32(IXGB_TX_DESC_CMD_EOP | IXGB_TX_DESC_CMD_RS);
1480
1481         /* Force memory writes to complete before letting h/w
1482          * know there are new descriptors to fetch.  (Only
1483          * applicable for weak-ordered memory model archs,
1484          * such as IA-64). */
1485         wmb();
1486
1487         tx_ring->next_to_use = i;
1488         IXGB_WRITE_REG(&adapter->hw, TDT, i);
1489 }
1490
1491 static int __ixgb_maybe_stop_tx(struct net_device *netdev, int size)
1492 {
1493         struct ixgb_adapter *adapter = netdev_priv(netdev);
1494         struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
1495
1496         netif_stop_queue(netdev);
1497         /* Herbert's original patch had:
1498          *  smp_mb__after_netif_stop_queue();
1499          * but since that doesn't exist yet, just open code it. */
1500         smp_mb();
1501
1502         /* We need to check again in a case another CPU has just
1503          * made room available. */
1504         if (likely(IXGB_DESC_UNUSED(tx_ring) < size))
1505                 return -EBUSY;
1506
1507         /* A reprieve! */
1508         netif_start_queue(netdev);
1509         ++adapter->restart_queue;
1510         return 0;
1511 }
1512
1513 static int ixgb_maybe_stop_tx(struct net_device *netdev,
1514                               struct ixgb_desc_ring *tx_ring, int size)
1515 {
1516         if (likely(IXGB_DESC_UNUSED(tx_ring) >= size))
1517                 return 0;
1518         return __ixgb_maybe_stop_tx(netdev, size);
1519 }
1520
1521
1522 /* Tx Descriptors needed, worst case */
1523 #define TXD_USE_COUNT(S) (((S) >> IXGB_MAX_TXD_PWR) + \
1524                          (((S) & (IXGB_MAX_DATA_PER_TXD - 1)) ? 1 : 0))
1525 #define DESC_NEEDED TXD_USE_COUNT(IXGB_MAX_DATA_PER_TXD) /* skb->date */ + \
1526         MAX_SKB_FRAGS * TXD_USE_COUNT(PAGE_SIZE) + 1 /* for context */ \
1527         + 1 /* one more needed for sentinel TSO workaround */
1528
1529 static netdev_tx_t
1530 ixgb_xmit_frame(struct sk_buff *skb, struct net_device *netdev)
1531 {
1532         struct ixgb_adapter *adapter = netdev_priv(netdev);
1533         unsigned int first;
1534         unsigned int tx_flags = 0;
1535         int vlan_id = 0;
1536         int count = 0;
1537         int tso;
1538
1539         if (test_bit(__IXGB_DOWN, &adapter->flags)) {
1540                 dev_kfree_skb(skb);
1541                 return NETDEV_TX_OK;
1542         }
1543
1544         if (skb->len <= 0) {
1545                 dev_kfree_skb(skb);
1546                 return NETDEV_TX_OK;
1547         }
1548
1549         if (unlikely(ixgb_maybe_stop_tx(netdev, &adapter->tx_ring,
1550                      DESC_NEEDED)))
1551                 return NETDEV_TX_BUSY;
1552
1553         if (vlan_tx_tag_present(skb)) {
1554                 tx_flags |= IXGB_TX_FLAGS_VLAN;
1555                 vlan_id = vlan_tx_tag_get(skb);
1556         }
1557
1558         first = adapter->tx_ring.next_to_use;
1559
1560         tso = ixgb_tso(adapter, skb);
1561         if (tso < 0) {
1562                 dev_kfree_skb(skb);
1563                 return NETDEV_TX_OK;
1564         }
1565
1566         if (likely(tso))
1567                 tx_flags |= IXGB_TX_FLAGS_TSO;
1568         else if (ixgb_tx_csum(adapter, skb))
1569                 tx_flags |= IXGB_TX_FLAGS_CSUM;
1570
1571         count = ixgb_tx_map(adapter, skb, first);
1572
1573         if (count) {
1574                 ixgb_tx_queue(adapter, count, vlan_id, tx_flags);
1575                 /* Make sure there is space in the ring for the next send. */
1576                 ixgb_maybe_stop_tx(netdev, &adapter->tx_ring, DESC_NEEDED);
1577
1578         } else {
1579                 dev_kfree_skb_any(skb);
1580                 adapter->tx_ring.buffer_info[first].time_stamp = 0;
1581                 adapter->tx_ring.next_to_use = first;
1582         }
1583
1584         return NETDEV_TX_OK;
1585 }
1586
1587 /**
1588  * ixgb_tx_timeout - Respond to a Tx Hang
1589  * @netdev: network interface device structure
1590  **/
1591
1592 static void
1593 ixgb_tx_timeout(struct net_device *netdev)
1594 {
1595         struct ixgb_adapter *adapter = netdev_priv(netdev);
1596
1597         /* Do the reset outside of interrupt context */
1598         schedule_work(&adapter->tx_timeout_task);
1599 }
1600
1601 static void
1602 ixgb_tx_timeout_task(struct work_struct *work)
1603 {
1604         struct ixgb_adapter *adapter =
1605                 container_of(work, struct ixgb_adapter, tx_timeout_task);
1606
1607         adapter->tx_timeout_count++;
1608         ixgb_down(adapter, true);
1609         ixgb_up(adapter);
1610 }
1611
1612 /**
1613  * ixgb_get_stats - Get System Network Statistics
1614  * @netdev: network interface device structure
1615  *
1616  * Returns the address of the device statistics structure.
1617  * The statistics are actually updated from the timer callback.
1618  **/
1619
1620 static struct net_device_stats *
1621 ixgb_get_stats(struct net_device *netdev)
1622 {
1623         return &netdev->stats;
1624 }
1625
1626 /**
1627  * ixgb_change_mtu - Change the Maximum Transfer Unit
1628  * @netdev: network interface device structure
1629  * @new_mtu: new value for maximum frame size
1630  *
1631  * Returns 0 on success, negative on failure
1632  **/
1633
1634 static int
1635 ixgb_change_mtu(struct net_device *netdev, int new_mtu)
1636 {
1637         struct ixgb_adapter *adapter = netdev_priv(netdev);
1638         int max_frame = new_mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;
1639         int old_max_frame = netdev->mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;
1640
1641         /* MTU < 68 is an error for IPv4 traffic, just don't allow it */
1642         if ((new_mtu < 68) ||
1643             (max_frame > IXGB_MAX_JUMBO_FRAME_SIZE + ENET_FCS_LENGTH)) {
1644                 netif_err(adapter, probe, adapter->netdev,
1645                           "Invalid MTU setting %d\n", new_mtu);
1646                 return -EINVAL;
1647         }
1648
1649         if (old_max_frame == max_frame)
1650                 return 0;
1651
1652         if (netif_running(netdev))
1653                 ixgb_down(adapter, true);
1654
1655         adapter->rx_buffer_len = max_frame + 8; /* + 8 for errata */
1656
1657         netdev->mtu = new_mtu;
1658
1659         if (netif_running(netdev))
1660                 ixgb_up(adapter);
1661
1662         return 0;
1663 }
1664
1665 /**
1666  * ixgb_update_stats - Update the board statistics counters.
1667  * @adapter: board private structure
1668  **/
1669
1670 void
1671 ixgb_update_stats(struct ixgb_adapter *adapter)
1672 {
1673         struct net_device *netdev = adapter->netdev;
1674         struct pci_dev *pdev = adapter->pdev;
1675
1676         /* Prevent stats update while adapter is being reset */
1677         if (pci_channel_offline(pdev))
1678                 return;
1679
1680         if ((netdev->flags & IFF_PROMISC) || (netdev->flags & IFF_ALLMULTI) ||
1681            (netdev_mc_count(netdev) > IXGB_MAX_NUM_MULTICAST_ADDRESSES)) {
1682                 u64 multi = IXGB_READ_REG(&adapter->hw, MPRCL);
1683                 u32 bcast_l = IXGB_READ_REG(&adapter->hw, BPRCL);
1684                 u32 bcast_h = IXGB_READ_REG(&adapter->hw, BPRCH);
1685                 u64 bcast = ((u64)bcast_h << 32) | bcast_l;
1686
1687                 multi |= ((u64)IXGB_READ_REG(&adapter->hw, MPRCH) << 32);
1688                 /* fix up multicast stats by removing broadcasts */
1689                 if (multi >= bcast)
1690                         multi -= bcast;
1691
1692                 adapter->stats.mprcl += (multi & 0xFFFFFFFF);
1693                 adapter->stats.mprch += (multi >> 32);
1694                 adapter->stats.bprcl += bcast_l;
1695                 adapter->stats.bprch += bcast_h;
1696         } else {
1697                 adapter->stats.mprcl += IXGB_READ_REG(&adapter->hw, MPRCL);
1698                 adapter->stats.mprch += IXGB_READ_REG(&adapter->hw, MPRCH);
1699                 adapter->stats.bprcl += IXGB_READ_REG(&adapter->hw, BPRCL);
1700                 adapter->stats.bprch += IXGB_READ_REG(&adapter->hw, BPRCH);
1701         }
1702         adapter->stats.tprl += IXGB_READ_REG(&adapter->hw, TPRL);
1703         adapter->stats.tprh += IXGB_READ_REG(&adapter->hw, TPRH);
1704         adapter->stats.gprcl += IXGB_READ_REG(&adapter->hw, GPRCL);
1705         adapter->stats.gprch += IXGB_READ_REG(&adapter->hw, GPRCH);
1706         adapter->stats.uprcl += IXGB_READ_REG(&adapter->hw, UPRCL);
1707         adapter->stats.uprch += IXGB_READ_REG(&adapter->hw, UPRCH);
1708         adapter->stats.vprcl += IXGB_READ_REG(&adapter->hw, VPRCL);
1709         adapter->stats.vprch += IXGB_READ_REG(&adapter->hw, VPRCH);
1710         adapter->stats.jprcl += IXGB_READ_REG(&adapter->hw, JPRCL);
1711         adapter->stats.jprch += IXGB_READ_REG(&adapter->hw, JPRCH);
1712         adapter->stats.gorcl += IXGB_READ_REG(&adapter->hw, GORCL);
1713         adapter->stats.gorch += IXGB_READ_REG(&adapter->hw, GORCH);
1714         adapter->stats.torl += IXGB_READ_REG(&adapter->hw, TORL);
1715         adapter->stats.torh += IXGB_READ_REG(&adapter->hw, TORH);
1716         adapter->stats.rnbc += IXGB_READ_REG(&adapter->hw, RNBC);
1717         adapter->stats.ruc += IXGB_READ_REG(&adapter->hw, RUC);
1718         adapter->stats.roc += IXGB_READ_REG(&adapter->hw, ROC);
1719         adapter->stats.rlec += IXGB_READ_REG(&adapter->hw, RLEC);
1720         adapter->stats.crcerrs += IXGB_READ_REG(&adapter->hw, CRCERRS);
1721         adapter->stats.icbc += IXGB_READ_REG(&adapter->hw, ICBC);
1722         adapter->stats.ecbc += IXGB_READ_REG(&adapter->hw, ECBC);
1723         adapter->stats.mpc += IXGB_READ_REG(&adapter->hw, MPC);
1724         adapter->stats.tptl += IXGB_READ_REG(&adapter->hw, TPTL);
1725         adapter->stats.tpth += IXGB_READ_REG(&adapter->hw, TPTH);
1726         adapter->stats.gptcl += IXGB_READ_REG(&adapter->hw, GPTCL);
1727         adapter->stats.gptch += IXGB_READ_REG(&adapter->hw, GPTCH);
1728         adapter->stats.bptcl += IXGB_READ_REG(&adapter->hw, BPTCL);
1729         adapter->stats.bptch += IXGB_READ_REG(&adapter->hw, BPTCH);
1730         adapter->stats.mptcl += IXGB_READ_REG(&adapter->hw, MPTCL);
1731         adapter->stats.mptch += IXGB_READ_REG(&adapter->hw, MPTCH);
1732         adapter->stats.uptcl += IXGB_READ_REG(&adapter->hw, UPTCL);
1733         adapter->stats.uptch += IXGB_READ_REG(&adapter->hw, UPTCH);
1734         adapter->stats.vptcl += IXGB_READ_REG(&adapter->hw, VPTCL);
1735         adapter->stats.vptch += IXGB_READ_REG(&adapter->hw, VPTCH);
1736         adapter->stats.jptcl += IXGB_READ_REG(&adapter->hw, JPTCL);
1737         adapter->stats.jptch += IXGB_READ_REG(&adapter->hw, JPTCH);
1738         adapter->stats.gotcl += IXGB_READ_REG(&adapter->hw, GOTCL);
1739         adapter->stats.gotch += IXGB_READ_REG(&adapter->hw, GOTCH);
1740         adapter->stats.totl += IXGB_READ_REG(&adapter->hw, TOTL);
1741         adapter->stats.toth += IXGB_READ_REG(&adapter->hw, TOTH);
1742         adapter->stats.dc += IXGB_READ_REG(&adapter->hw, DC);
1743         adapter->stats.plt64c += IXGB_READ_REG(&adapter->hw, PLT64C);
1744         adapter->stats.tsctc += IXGB_READ_REG(&adapter->hw, TSCTC);
1745         adapter->stats.tsctfc += IXGB_READ_REG(&adapter->hw, TSCTFC);
1746         adapter->stats.ibic += IXGB_READ_REG(&adapter->hw, IBIC);
1747         adapter->stats.rfc += IXGB_READ_REG(&adapter->hw, RFC);
1748         adapter->stats.lfc += IXGB_READ_REG(&adapter->hw, LFC);
1749         adapter->stats.pfrc += IXGB_READ_REG(&adapter->hw, PFRC);
1750         adapter->stats.pftc += IXGB_READ_REG(&adapter->hw, PFTC);
1751         adapter->stats.mcfrc += IXGB_READ_REG(&adapter->hw, MCFRC);
1752         adapter->stats.mcftc += IXGB_READ_REG(&adapter->hw, MCFTC);
1753         adapter->stats.xonrxc += IXGB_READ_REG(&adapter->hw, XONRXC);
1754         adapter->stats.xontxc += IXGB_READ_REG(&adapter->hw, XONTXC);
1755         adapter->stats.xoffrxc += IXGB_READ_REG(&adapter->hw, XOFFRXC);
1756         adapter->stats.xofftxc += IXGB_READ_REG(&adapter->hw, XOFFTXC);
1757         adapter->stats.rjc += IXGB_READ_REG(&adapter->hw, RJC);
1758
1759         /* Fill out the OS statistics structure */
1760
1761         netdev->stats.rx_packets = adapter->stats.gprcl;
1762         netdev->stats.tx_packets = adapter->stats.gptcl;
1763         netdev->stats.rx_bytes = adapter->stats.gorcl;
1764         netdev->stats.tx_bytes = adapter->stats.gotcl;
1765         netdev->stats.multicast = adapter->stats.mprcl;
1766         netdev->stats.collisions = 0;
1767
1768         /* ignore RLEC as it reports errors for padded (<64bytes) frames
1769          * with a length in the type/len field */
1770         netdev->stats.rx_errors =
1771             /* adapter->stats.rnbc + */ adapter->stats.crcerrs +
1772             adapter->stats.ruc +
1773             adapter->stats.roc /*+ adapter->stats.rlec */  +
1774             adapter->stats.icbc +
1775             adapter->stats.ecbc + adapter->stats.mpc;
1776
1777         /* see above
1778          * netdev->stats.rx_length_errors = adapter->stats.rlec;
1779          */
1780
1781         netdev->stats.rx_crc_errors = adapter->stats.crcerrs;
1782         netdev->stats.rx_fifo_errors = adapter->stats.mpc;
1783         netdev->stats.rx_missed_errors = adapter->stats.mpc;
1784         netdev->stats.rx_over_errors = adapter->stats.mpc;
1785
1786         netdev->stats.tx_errors = 0;
1787         netdev->stats.rx_frame_errors = 0;
1788         netdev->stats.tx_aborted_errors = 0;
1789         netdev->stats.tx_carrier_errors = 0;
1790         netdev->stats.tx_fifo_errors = 0;
1791         netdev->stats.tx_heartbeat_errors = 0;
1792         netdev->stats.tx_window_errors = 0;
1793 }
1794
1795 #define IXGB_MAX_INTR 10
1796 /**
1797  * ixgb_intr - Interrupt Handler
1798  * @irq: interrupt number
1799  * @data: pointer to a network interface device structure
1800  **/
1801
1802 static irqreturn_t
1803 ixgb_intr(int irq, void *data)
1804 {
1805         struct net_device *netdev = data;
1806         struct ixgb_adapter *adapter = netdev_priv(netdev);
1807         struct ixgb_hw *hw = &adapter->hw;
1808         u32 icr = IXGB_READ_REG(hw, ICR);
1809
1810         if (unlikely(!icr))
1811                 return IRQ_NONE;  /* Not our interrupt */
1812
1813         if (unlikely(icr & (IXGB_INT_RXSEQ | IXGB_INT_LSC)))
1814                 if (!test_bit(__IXGB_DOWN, &adapter->flags))
1815                         mod_timer(&adapter->watchdog_timer, jiffies);
1816
1817         if (napi_schedule_prep(&adapter->napi)) {
1818
1819                 /* Disable interrupts and register for poll. The flush
1820                   of the posted write is intentionally left out.
1821                 */
1822
1823                 IXGB_WRITE_REG(&adapter->hw, IMC, ~0);
1824                 __napi_schedule(&adapter->napi);
1825         }
1826         return IRQ_HANDLED;
1827 }
1828
1829 /**
1830  * ixgb_clean - NAPI Rx polling callback
1831  * @adapter: board private structure
1832  **/
1833
1834 static int
1835 ixgb_clean(struct napi_struct *napi, int budget)
1836 {
1837         struct ixgb_adapter *adapter = container_of(napi, struct ixgb_adapter, napi);
1838         int work_done = 0;
1839
1840         ixgb_clean_tx_irq(adapter);
1841         ixgb_clean_rx_irq(adapter, &work_done, budget);
1842
1843         /* If budget not fully consumed, exit the polling mode */
1844         if (work_done < budget) {
1845                 napi_complete(napi);
1846                 if (!test_bit(__IXGB_DOWN, &adapter->flags))
1847                         ixgb_irq_enable(adapter);
1848         }
1849
1850         return work_done;
1851 }
1852
1853 /**
1854  * ixgb_clean_tx_irq - Reclaim resources after transmit completes
1855  * @adapter: board private structure
1856  **/
1857
1858 static bool
1859 ixgb_clean_tx_irq(struct ixgb_adapter *adapter)
1860 {
1861         struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
1862         struct net_device *netdev = adapter->netdev;
1863         struct ixgb_tx_desc *tx_desc, *eop_desc;
1864         struct ixgb_buffer *buffer_info;
1865         unsigned int i, eop;
1866         bool cleaned = false;
1867
1868         i = tx_ring->next_to_clean;
1869         eop = tx_ring->buffer_info[i].next_to_watch;
1870         eop_desc = IXGB_TX_DESC(*tx_ring, eop);
1871
1872         while (eop_desc->status & IXGB_TX_DESC_STATUS_DD) {
1873
1874                 rmb(); /* read buffer_info after eop_desc */
1875                 for (cleaned = false; !cleaned; ) {
1876                         tx_desc = IXGB_TX_DESC(*tx_ring, i);
1877                         buffer_info = &tx_ring->buffer_info[i];
1878
1879                         if (tx_desc->popts &
1880                            (IXGB_TX_DESC_POPTS_TXSM |
1881                             IXGB_TX_DESC_POPTS_IXSM))
1882                                 adapter->hw_csum_tx_good++;
1883
1884                         ixgb_unmap_and_free_tx_resource(adapter, buffer_info);
1885
1886                         *(u32 *)&(tx_desc->status) = 0;
1887
1888                         cleaned = (i == eop);
1889                         if (++i == tx_ring->count) i = 0;
1890                 }
1891
1892                 eop = tx_ring->buffer_info[i].next_to_watch;
1893                 eop_desc = IXGB_TX_DESC(*tx_ring, eop);
1894         }
1895
1896         tx_ring->next_to_clean = i;
1897
1898         if (unlikely(cleaned && netif_carrier_ok(netdev) &&
1899                      IXGB_DESC_UNUSED(tx_ring) >= DESC_NEEDED)) {
1900                 /* Make sure that anybody stopping the queue after this
1901                  * sees the new next_to_clean. */
1902                 smp_mb();
1903
1904                 if (netif_queue_stopped(netdev) &&
1905                     !(test_bit(__IXGB_DOWN, &adapter->flags))) {
1906                         netif_wake_queue(netdev);
1907                         ++adapter->restart_queue;
1908                 }
1909         }
1910
1911         if (adapter->detect_tx_hung) {
1912                 /* detect a transmit hang in hardware, this serializes the
1913                  * check with the clearing of time_stamp and movement of i */
1914                 adapter->detect_tx_hung = false;
1915                 if (tx_ring->buffer_info[eop].time_stamp &&
1916                    time_after(jiffies, tx_ring->buffer_info[eop].time_stamp + HZ)
1917                    && !(IXGB_READ_REG(&adapter->hw, STATUS) &
1918                         IXGB_STATUS_TXOFF)) {
1919                         /* detected Tx unit hang */
1920                         netif_err(adapter, drv, adapter->netdev,
1921                                   "Detected Tx Unit Hang\n"
1922                                   "  TDH                  <%x>\n"
1923                                   "  TDT                  <%x>\n"
1924                                   "  next_to_use          <%x>\n"
1925                                   "  next_to_clean        <%x>\n"
1926                                   "buffer_info[next_to_clean]\n"
1927                                   "  time_stamp           <%lx>\n"
1928                                   "  next_to_watch        <%x>\n"
1929                                   "  jiffies              <%lx>\n"
1930                                   "  next_to_watch.status <%x>\n",
1931                                   IXGB_READ_REG(&adapter->hw, TDH),
1932                                   IXGB_READ_REG(&adapter->hw, TDT),
1933                                   tx_ring->next_to_use,
1934                                   tx_ring->next_to_clean,
1935                                   tx_ring->buffer_info[eop].time_stamp,
1936                                   eop,
1937                                   jiffies,
1938                                   eop_desc->status);
1939                         netif_stop_queue(netdev);
1940                 }
1941         }
1942
1943         return cleaned;
1944 }
1945
1946 /**
1947  * ixgb_rx_checksum - Receive Checksum Offload for 82597.
1948  * @adapter: board private structure
1949  * @rx_desc: receive descriptor
1950  * @sk_buff: socket buffer with received data
1951  **/
1952
1953 static void
1954 ixgb_rx_checksum(struct ixgb_adapter *adapter,
1955                  struct ixgb_rx_desc *rx_desc,
1956                  struct sk_buff *skb)
1957 {
1958         /* Ignore Checksum bit is set OR
1959          * TCP Checksum has not been calculated
1960          */
1961         if ((rx_desc->status & IXGB_RX_DESC_STATUS_IXSM) ||
1962            (!(rx_desc->status & IXGB_RX_DESC_STATUS_TCPCS))) {
1963                 skb_checksum_none_assert(skb);
1964                 return;
1965         }
1966
1967         /* At this point we know the hardware did the TCP checksum */
1968         /* now look at the TCP checksum error bit */
1969         if (rx_desc->errors & IXGB_RX_DESC_ERRORS_TCPE) {
1970                 /* let the stack verify checksum errors */
1971                 skb_checksum_none_assert(skb);
1972                 adapter->hw_csum_rx_error++;
1973         } else {
1974                 /* TCP checksum is good */
1975                 skb->ip_summed = CHECKSUM_UNNECESSARY;
1976                 adapter->hw_csum_rx_good++;
1977         }
1978 }
1979
1980 /*
1981  * this should improve performance for small packets with large amounts
1982  * of reassembly being done in the stack
1983  */
1984 static void ixgb_check_copybreak(struct net_device *netdev,
1985                                  struct ixgb_buffer *buffer_info,
1986                                  u32 length, struct sk_buff **skb)
1987 {
1988         struct sk_buff *new_skb;
1989
1990         if (length > copybreak)
1991                 return;
1992
1993         new_skb = netdev_alloc_skb_ip_align(netdev, length);
1994         if (!new_skb)
1995                 return;
1996
1997         skb_copy_to_linear_data_offset(new_skb, -NET_IP_ALIGN,
1998                                        (*skb)->data - NET_IP_ALIGN,
1999                                        length + NET_IP_ALIGN);
2000         /* save the skb in buffer_info as good */
2001         buffer_info->skb = *skb;
2002         *skb = new_skb;
2003 }
2004
2005 /**
2006  * ixgb_clean_rx_irq - Send received data up the network stack,
2007  * @adapter: board private structure
2008  **/
2009
2010 static bool
2011 ixgb_clean_rx_irq(struct ixgb_adapter *adapter, int *work_done, int work_to_do)
2012 {
2013         struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
2014         struct net_device *netdev = adapter->netdev;
2015         struct pci_dev *pdev = adapter->pdev;
2016         struct ixgb_rx_desc *rx_desc, *next_rxd;
2017         struct ixgb_buffer *buffer_info, *next_buffer, *next2_buffer;
2018         u32 length;
2019         unsigned int i, j;
2020         int cleaned_count = 0;
2021         bool cleaned = false;
2022
2023         i = rx_ring->next_to_clean;
2024         rx_desc = IXGB_RX_DESC(*rx_ring, i);
2025         buffer_info = &rx_ring->buffer_info[i];
2026
2027         while (rx_desc->status & IXGB_RX_DESC_STATUS_DD) {
2028                 struct sk_buff *skb;
2029                 u8 status;
2030
2031                 if (*work_done >= work_to_do)
2032                         break;
2033
2034                 (*work_done)++;
2035                 rmb();  /* read descriptor and rx_buffer_info after status DD */
2036                 status = rx_desc->status;
2037                 skb = buffer_info->skb;
2038                 buffer_info->skb = NULL;
2039
2040                 prefetch(skb->data - NET_IP_ALIGN);
2041
2042                 if (++i == rx_ring->count)
2043                         i = 0;
2044                 next_rxd = IXGB_RX_DESC(*rx_ring, i);
2045                 prefetch(next_rxd);
2046
2047                 j = i + 1;
2048                 if (j == rx_ring->count)
2049                         j = 0;
2050                 next2_buffer = &rx_ring->buffer_info[j];
2051                 prefetch(next2_buffer);
2052
2053                 next_buffer = &rx_ring->buffer_info[i];
2054
2055                 cleaned = true;
2056                 cleaned_count++;
2057
2058                 dma_unmap_single(&pdev->dev,
2059                                  buffer_info->dma,
2060                                  buffer_info->length,
2061                                  DMA_FROM_DEVICE);
2062                 buffer_info->dma = 0;
2063
2064                 length = le16_to_cpu(rx_desc->length);
2065                 rx_desc->length = 0;
2066
2067                 if (unlikely(!(status & IXGB_RX_DESC_STATUS_EOP))) {
2068
2069                         /* All receives must fit into a single buffer */
2070
2071                         pr_debug("Receive packet consumed multiple buffers length<%x>\n",
2072                                  length);
2073
2074                         dev_kfree_skb_irq(skb);
2075                         goto rxdesc_done;
2076                 }
2077
2078                 if (unlikely(rx_desc->errors &
2079                     (IXGB_RX_DESC_ERRORS_CE | IXGB_RX_DESC_ERRORS_SE |
2080                      IXGB_RX_DESC_ERRORS_P | IXGB_RX_DESC_ERRORS_RXE))) {
2081                         dev_kfree_skb_irq(skb);
2082                         goto rxdesc_done;
2083                 }
2084
2085                 ixgb_check_copybreak(netdev, buffer_info, length, &skb);
2086
2087                 /* Good Receive */
2088                 skb_put(skb, length);
2089
2090                 /* Receive Checksum Offload */
2091                 ixgb_rx_checksum(adapter, rx_desc, skb);
2092
2093                 skb->protocol = eth_type_trans(skb, netdev);
2094                 if (status & IXGB_RX_DESC_STATUS_VP)
2095                         __vlan_hwaccel_put_tag(skb,
2096                                                le16_to_cpu(rx_desc->special));
2097
2098                 netif_receive_skb(skb);
2099
2100 rxdesc_done:
2101                 /* clean up descriptor, might be written over by hw */
2102                 rx_desc->status = 0;
2103
2104                 /* return some buffers to hardware, one at a time is too slow */
2105                 if (unlikely(cleaned_count >= IXGB_RX_BUFFER_WRITE)) {
2106                         ixgb_alloc_rx_buffers(adapter, cleaned_count);
2107                         cleaned_count = 0;
2108                 }
2109
2110                 /* use prefetched values */
2111                 rx_desc = next_rxd;
2112                 buffer_info = next_buffer;
2113         }
2114
2115         rx_ring->next_to_clean = i;
2116
2117         cleaned_count = IXGB_DESC_UNUSED(rx_ring);
2118         if (cleaned_count)
2119                 ixgb_alloc_rx_buffers(adapter, cleaned_count);
2120
2121         return cleaned;
2122 }
2123
2124 /**
2125  * ixgb_alloc_rx_buffers - Replace used receive buffers
2126  * @adapter: address of board private structure
2127  **/
2128
2129 static void
2130 ixgb_alloc_rx_buffers(struct ixgb_adapter *adapter, int cleaned_count)
2131 {
2132         struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
2133         struct net_device *netdev = adapter->netdev;
2134         struct pci_dev *pdev = adapter->pdev;
2135         struct ixgb_rx_desc *rx_desc;
2136         struct ixgb_buffer *buffer_info;
2137         struct sk_buff *skb;
2138         unsigned int i;
2139         long cleancount;
2140
2141         i = rx_ring->next_to_use;
2142         buffer_info = &rx_ring->buffer_info[i];
2143         cleancount = IXGB_DESC_UNUSED(rx_ring);
2144
2145
2146         /* leave three descriptors unused */
2147         while (--cleancount > 2 && cleaned_count--) {
2148                 /* recycle! its good for you */
2149                 skb = buffer_info->skb;
2150                 if (skb) {
2151                         skb_trim(skb, 0);
2152                         goto map_skb;
2153                 }
2154
2155                 skb = netdev_alloc_skb_ip_align(netdev, adapter->rx_buffer_len);
2156                 if (unlikely(!skb)) {
2157                         /* Better luck next round */
2158                         adapter->alloc_rx_buff_failed++;
2159                         break;
2160                 }
2161
2162                 buffer_info->skb = skb;
2163                 buffer_info->length = adapter->rx_buffer_len;
2164 map_skb:
2165                 buffer_info->dma = dma_map_single(&pdev->dev,
2166                                                   skb->data,
2167                                                   adapter->rx_buffer_len,
2168                                                   DMA_FROM_DEVICE);
2169
2170                 rx_desc = IXGB_RX_DESC(*rx_ring, i);
2171                 rx_desc->buff_addr = cpu_to_le64(buffer_info->dma);
2172                 /* guarantee DD bit not set now before h/w gets descriptor
2173                  * this is the rest of the workaround for h/w double
2174                  * writeback. */
2175                 rx_desc->status = 0;
2176
2177
2178                 if (++i == rx_ring->count) i = 0;
2179                 buffer_info = &rx_ring->buffer_info[i];
2180         }
2181
2182         if (likely(rx_ring->next_to_use != i)) {
2183                 rx_ring->next_to_use = i;
2184                 if (unlikely(i-- == 0))
2185                         i = (rx_ring->count - 1);
2186
2187                 /* Force memory writes to complete before letting h/w
2188                  * know there are new descriptors to fetch.  (Only
2189                  * applicable for weak-ordered memory model archs, such
2190                  * as IA-64). */
2191                 wmb();
2192                 IXGB_WRITE_REG(&adapter->hw, RDT, i);
2193         }
2194 }
2195
2196 static void
2197 ixgb_vlan_strip_enable(struct ixgb_adapter *adapter)
2198 {
2199         u32 ctrl;
2200
2201         /* enable VLAN tag insert/strip */
2202         ctrl = IXGB_READ_REG(&adapter->hw, CTRL0);
2203         ctrl |= IXGB_CTRL0_VME;
2204         IXGB_WRITE_REG(&adapter->hw, CTRL0, ctrl);
2205 }
2206
2207 static void
2208 ixgb_vlan_strip_disable(struct ixgb_adapter *adapter)
2209 {
2210         u32 ctrl;
2211
2212         /* disable VLAN tag insert/strip */
2213         ctrl = IXGB_READ_REG(&adapter->hw, CTRL0);
2214         ctrl &= ~IXGB_CTRL0_VME;
2215         IXGB_WRITE_REG(&adapter->hw, CTRL0, ctrl);
2216 }
2217
2218 static int
2219 ixgb_vlan_rx_add_vid(struct net_device *netdev, u16 vid)
2220 {
2221         struct ixgb_adapter *adapter = netdev_priv(netdev);
2222         u32 vfta, index;
2223
2224         /* add VID to filter table */
2225
2226         index = (vid >> 5) & 0x7F;
2227         vfta = IXGB_READ_REG_ARRAY(&adapter->hw, VFTA, index);
2228         vfta |= (1 << (vid & 0x1F));
2229         ixgb_write_vfta(&adapter->hw, index, vfta);
2230         set_bit(vid, adapter->active_vlans);
2231
2232         return 0;
2233 }
2234
2235 static int
2236 ixgb_vlan_rx_kill_vid(struct net_device *netdev, u16 vid)
2237 {
2238         struct ixgb_adapter *adapter = netdev_priv(netdev);
2239         u32 vfta, index;
2240
2241         /* remove VID from filter table */
2242
2243         index = (vid >> 5) & 0x7F;
2244         vfta = IXGB_READ_REG_ARRAY(&adapter->hw, VFTA, index);
2245         vfta &= ~(1 << (vid & 0x1F));
2246         ixgb_write_vfta(&adapter->hw, index, vfta);
2247         clear_bit(vid, adapter->active_vlans);
2248
2249         return 0;
2250 }
2251
2252 static void
2253 ixgb_restore_vlan(struct ixgb_adapter *adapter)
2254 {
2255         u16 vid;
2256
2257         for_each_set_bit(vid, adapter->active_vlans, VLAN_N_VID)
2258                 ixgb_vlan_rx_add_vid(adapter->netdev, vid);
2259 }
2260
2261 #ifdef CONFIG_NET_POLL_CONTROLLER
2262 /*
2263  * Polling 'interrupt' - used by things like netconsole to send skbs
2264  * without having to re-enable interrupts. It's not called while
2265  * the interrupt routine is executing.
2266  */
2267
2268 static void ixgb_netpoll(struct net_device *dev)
2269 {
2270         struct ixgb_adapter *adapter = netdev_priv(dev);
2271
2272         disable_irq(adapter->pdev->irq);
2273         ixgb_intr(adapter->pdev->irq, dev);
2274         enable_irq(adapter->pdev->irq);
2275 }
2276 #endif
2277
2278 /**
2279  * ixgb_io_error_detected() - called when PCI error is detected
2280  * @pdev    pointer to pci device with error
2281  * @state   pci channel state after error
2282  *
2283  * This callback is called by the PCI subsystem whenever
2284  * a PCI bus error is detected.
2285  */
2286 static pci_ers_result_t ixgb_io_error_detected(struct pci_dev *pdev,
2287                                                enum pci_channel_state state)
2288 {
2289         struct net_device *netdev = pci_get_drvdata(pdev);
2290         struct ixgb_adapter *adapter = netdev_priv(netdev);
2291
2292         netif_device_detach(netdev);
2293
2294         if (state == pci_channel_io_perm_failure)
2295                 return PCI_ERS_RESULT_DISCONNECT;
2296
2297         if (netif_running(netdev))
2298                 ixgb_down(adapter, true);
2299
2300         pci_disable_device(pdev);
2301
2302         /* Request a slot reset. */
2303         return PCI_ERS_RESULT_NEED_RESET;
2304 }
2305
2306 /**
2307  * ixgb_io_slot_reset - called after the pci bus has been reset.
2308  * @pdev    pointer to pci device with error
2309  *
2310  * This callback is called after the PCI bus has been reset.
2311  * Basically, this tries to restart the card from scratch.
2312  * This is a shortened version of the device probe/discovery code,
2313  * it resembles the first-half of the ixgb_probe() routine.
2314  */
2315 static pci_ers_result_t ixgb_io_slot_reset(struct pci_dev *pdev)
2316 {
2317         struct net_device *netdev = pci_get_drvdata(pdev);
2318         struct ixgb_adapter *adapter = netdev_priv(netdev);
2319
2320         if (pci_enable_device(pdev)) {
2321                 netif_err(adapter, probe, adapter->netdev,
2322                           "Cannot re-enable PCI device after reset\n");
2323                 return PCI_ERS_RESULT_DISCONNECT;
2324         }
2325
2326         /* Perform card reset only on one instance of the card */
2327         if (0 != PCI_FUNC (pdev->devfn))
2328                 return PCI_ERS_RESULT_RECOVERED;
2329
2330         pci_set_master(pdev);
2331
2332         netif_carrier_off(netdev);
2333         netif_stop_queue(netdev);
2334         ixgb_reset(adapter);
2335
2336         /* Make sure the EEPROM is good */
2337         if (!ixgb_validate_eeprom_checksum(&adapter->hw)) {
2338                 netif_err(adapter, probe, adapter->netdev,
2339                           "After reset, the EEPROM checksum is not valid\n");
2340                 return PCI_ERS_RESULT_DISCONNECT;
2341         }
2342         ixgb_get_ee_mac_addr(&adapter->hw, netdev->dev_addr);
2343         memcpy(netdev->perm_addr, netdev->dev_addr, netdev->addr_len);
2344
2345         if (!is_valid_ether_addr(netdev->perm_addr)) {
2346                 netif_err(adapter, probe, adapter->netdev,
2347                           "After reset, invalid MAC address\n");
2348                 return PCI_ERS_RESULT_DISCONNECT;
2349         }
2350
2351         return PCI_ERS_RESULT_RECOVERED;
2352 }
2353
2354 /**
2355  * ixgb_io_resume - called when its OK to resume normal operations
2356  * @pdev    pointer to pci device with error
2357  *
2358  * The error recovery driver tells us that its OK to resume
2359  * normal operation. Implementation resembles the second-half
2360  * of the ixgb_probe() routine.
2361  */
2362 static void ixgb_io_resume(struct pci_dev *pdev)
2363 {
2364         struct net_device *netdev = pci_get_drvdata(pdev);
2365         struct ixgb_adapter *adapter = netdev_priv(netdev);
2366
2367         pci_set_master(pdev);
2368
2369         if (netif_running(netdev)) {
2370                 if (ixgb_up(adapter)) {
2371                         pr_err("can't bring device back up after reset\n");
2372                         return;
2373                 }
2374         }
2375
2376         netif_device_attach(netdev);
2377         mod_timer(&adapter->watchdog_timer, jiffies);
2378 }
2379
2380 /* ixgb_main.c */