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

   1 // SPDX-License-Identifier: GPL-2.0
   2 /* Copyright(c) 1999 - 2008 Intel Corporation. */
   3
   4 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
   5
   6 #include <linux/prefetch.h>
   7 #include "ixgb.h"
   8
   9 char ixgb_driver_name[] = "ixgb";
  10 static char ixgb_driver_string[] = "Intel(R) PRO/10GbE Network Driver";
  11
  12 #define DRIVERNAPI "-NAPI"
  13 #define DRV_VERSION "1.0.135-k2" DRIVERNAPI
  14 const char ixgb_driver_version[] = DRV_VERSION;
  15 static const char ixgb_copyright[] = "Copyright (c) 1999-2008 Intel Corporation.";
  16
  17 #define IXGB_CB_LENGTH 256
  18 static unsigned int copybreak __read_mostly = IXGB_CB_LENGTH;
  19 module_param(copybreak, uint, 0644);
  20 MODULE_PARM_DESC(copybreak,
  21         "Maximum size of packet that is copied to a new buffer on receive");
  22
  23 /* ixgb_pci_tbl - PCI Device ID Table
  24  *
  25  * Wildcard entries (PCI_ANY_ID) should come last
  26  * Last entry must be all 0s
  27  *
  28  * { Vendor ID, Device ID, SubVendor ID, SubDevice ID,
  29  *   Class, Class Mask, private data (not used) }
  30  */
  31 static const struct pci_device_id ixgb_pci_tbl[] = {
  32         {PCI_VENDOR_ID_INTEL, IXGB_DEVICE_ID_82597EX,
  33          PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
  34         {PCI_VENDOR_ID_INTEL, IXGB_DEVICE_ID_82597EX_CX4,
  35          PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
  36         {PCI_VENDOR_ID_INTEL, IXGB_DEVICE_ID_82597EX_SR,
  37          PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
  38         {PCI_VENDOR_ID_INTEL, IXGB_DEVICE_ID_82597EX_LR,
  39          PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
  40
  41         /* required last entry */
  42         {0,}
  43 };
  44
  45 MODULE_DEVICE_TABLE(pci, ixgb_pci_tbl);
  46
  47 /* Local Function Prototypes */
  48 static int ixgb_init_module(void);
  49 static void ixgb_exit_module(void);
  50 static int ixgb_probe(struct pci_dev *pdev, const struct pci_device_id *ent);
  51 static void ixgb_remove(struct pci_dev *pdev);
  52 static int ixgb_sw_init(struct ixgb_adapter *adapter);
  53 static int ixgb_open(struct net_device *netdev);
  54 static int ixgb_close(struct net_device *netdev);
  55 static void ixgb_configure_tx(struct ixgb_adapter *adapter);
  56 static void ixgb_configure_rx(struct ixgb_adapter *adapter);
  57 static void ixgb_setup_rctl(struct ixgb_adapter *adapter);
  58 static void ixgb_clean_tx_ring(struct ixgb_adapter *adapter);
  59 static void ixgb_clean_rx_ring(struct ixgb_adapter *adapter);
  60 static void ixgb_set_multi(struct net_device *netdev);
  61 static void ixgb_watchdog(struct timer_list *t);
  62 static netdev_tx_t ixgb_xmit_frame(struct sk_buff *skb,
  63                                    struct net_device *netdev);
  64 static int ixgb_change_mtu(struct net_device *netdev, int new_mtu);
  65 static int ixgb_set_mac(struct net_device *netdev, void *p);
  66 static irqreturn_t ixgb_intr(int irq, void *data);
  67 static bool ixgb_clean_tx_irq(struct ixgb_adapter *adapter);
  68
  69 static int ixgb_clean(struct napi_struct *, int);
  70 static bool ixgb_clean_rx_irq(struct ixgb_adapter *, int *, int);
  71 static void ixgb_alloc_rx_buffers(struct ixgb_adapter *, int);
  72
  73 static void ixgb_tx_timeout(struct net_device *dev);
  74 static void ixgb_tx_timeout_task(struct work_struct *work);
  75
  76 static void ixgb_vlan_strip_enable(struct ixgb_adapter *adapter);
  77 static void ixgb_vlan_strip_disable(struct ixgb_adapter *adapter);
  78 static int ixgb_vlan_rx_add_vid(struct net_device *netdev,
  79                                 __be16 proto, u16 vid);
  80 static int ixgb_vlan_rx_kill_vid(struct net_device *netdev,
  81                                  __be16 proto, u16 vid);
  82 static void ixgb_restore_vlan(struct ixgb_adapter *adapter);
  83
  84 #ifdef CONFIG_NET_POLL_CONTROLLER
  85 /* for netdump / net console */
  86 static void ixgb_netpoll(struct net_device *dev);
  87 #endif
  88
  89 static pci_ers_result_t ixgb_io_error_detected (struct pci_dev *pdev,
  90                              enum pci_channel_state state);
  91 static pci_ers_result_t ixgb_io_slot_reset (struct pci_dev *pdev);
  92 static void ixgb_io_resume (struct pci_dev *pdev);
  93
  94 static const struct pci_error_handlers ixgb_err_handler = {
  95         .error_detected = ixgb_io_error_detected,
  96         .slot_reset = ixgb_io_slot_reset,
  97         .resume = ixgb_io_resume,
  98 };
  99
 100 static struct pci_driver ixgb_driver = {
 101         .name     = ixgb_driver_name,
 102         .id_table = ixgb_pci_tbl,
 103         .probe    = ixgb_probe,
 104         .remove   = ixgb_remove,
 105         .err_handler = &ixgb_err_handler
 106 };
 107
 108 MODULE_AUTHOR("Intel Corporation, <linux.nics@intel.com>");
 109 MODULE_DESCRIPTION("Intel(R) PRO/10GbE Network Driver");
 110 MODULE_LICENSE("GPL");
 111 MODULE_VERSION(DRV_VERSION);
 112
 113 #define DEFAULT_MSG_ENABLE (NETIF_MSG_DRV|NETIF_MSG_PROBE|NETIF_MSG_LINK)
 114 static int debug = -1;
 115 module_param(debug, int, 0);
 116 MODULE_PARM_DESC(debug, "Debug level (0=none,...,16=all)");
 117
 118 /**
 119  * ixgb_init_module - Driver Registration Routine
 120  *
 121  * ixgb_init_module is the first routine called when the driver is
 122  * loaded. All it does is register with the PCI subsystem.
 123  **/
 124
 125 static int __init
 126 ixgb_init_module(void)
 127 {
 128         pr_info("%s - version %s\n", ixgb_driver_string, ixgb_driver_version);
 129         pr_info("%s\n", ixgb_copyright);
 130
 131         return pci_register_driver(&ixgb_driver);
 132 }
 133
 134 module_init(ixgb_init_module);
 135
 136 /**
 137  * ixgb_exit_module - Driver Exit Cleanup Routine
 138  *
 139  * ixgb_exit_module is called just before the driver is removed
 140  * from memory.
 141  **/
 142
 143 static void __exit
 144 ixgb_exit_module(void)
 145 {
 146         pci_unregister_driver(&ixgb_driver);
 147 }
 148
 149 module_exit(ixgb_exit_module);
 150
 151 /**
 152  * ixgb_irq_disable - Mask off interrupt generation on the NIC
 153  * @adapter: board private structure
 154  **/
 155
 156 static void
 157 ixgb_irq_disable(struct ixgb_adapter *adapter)
 158 {
 159         IXGB_WRITE_REG(&adapter->hw, IMC, ~0);
 160         IXGB_WRITE_FLUSH(&adapter->hw);
 161         synchronize_irq(adapter->pdev->irq);
 162 }
 163
 164 /**
 165  * ixgb_irq_enable - Enable default interrupt generation settings
 166  * @adapter: board private structure
 167  **/
 168
 169 static void
 170 ixgb_irq_enable(struct ixgb_adapter *adapter)
 171 {
 172         u32 val = IXGB_INT_RXT0 | IXGB_INT_RXDMT0 |
 173                   IXGB_INT_TXDW | IXGB_INT_LSC;
 174         if (adapter->hw.subsystem_vendor_id == PCI_VENDOR_ID_SUN)
 175                 val |= IXGB_INT_GPI0;
 176         IXGB_WRITE_REG(&adapter->hw, IMS, val);
 177         IXGB_WRITE_FLUSH(&adapter->hw);
 178 }
 179
 180 int
 181 ixgb_up(struct ixgb_adapter *adapter)
 182 {
 183         struct net_device *netdev = adapter->netdev;
 184         int err, irq_flags = IRQF_SHARED;
 185         int max_frame = netdev->mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;
 186         struct ixgb_hw *hw = &adapter->hw;
 187
 188         /* hardware has been reset, we need to reload some things */
 189
 190         ixgb_rar_set(hw, netdev->dev_addr, 0);
 191         ixgb_set_multi(netdev);
 192
 193         ixgb_restore_vlan(adapter);
 194
 195         ixgb_configure_tx(adapter);
 196         ixgb_setup_rctl(adapter);
 197         ixgb_configure_rx(adapter);
 198         ixgb_alloc_rx_buffers(adapter, IXGB_DESC_UNUSED(&adapter->rx_ring));
 199
 200         /* disable interrupts and get the hardware into a known state */
 201         IXGB_WRITE_REG(&adapter->hw, IMC, 0xffffffff);
 202
 203         /* only enable MSI if bus is in PCI-X mode */
 204         if (IXGB_READ_REG(&adapter->hw, STATUS) & IXGB_STATUS_PCIX_MODE) {
 205                 err = pci_enable_msi(adapter->pdev);
 206                 if (!err) {
 207                         adapter->have_msi = true;
 208                         irq_flags = 0;
 209                 }
 210                 /* proceed to try to request regular interrupt */
 211         }
 212
 213         err = request_irq(adapter->pdev->irq, ixgb_intr, irq_flags,
 214                           netdev->name, netdev);
 215         if (err) {
 216                 if (adapter->have_msi)
 217                         pci_disable_msi(adapter->pdev);
 218                 netif_err(adapter, probe, adapter->netdev,
 219                           "Unable to allocate interrupt Error: %d\n", err);
 220                 return err;
 221         }
 222
 223         if ((hw->max_frame_size != max_frame) ||
 224                 (hw->max_frame_size !=
 225                 (IXGB_READ_REG(hw, MFS) >> IXGB_MFS_SHIFT))) {
 226
 227                 hw->max_frame_size = max_frame;
 228
 229                 IXGB_WRITE_REG(hw, MFS, hw->max_frame_size << IXGB_MFS_SHIFT);
 230
 231                 if (hw->max_frame_size >
 232                    IXGB_MAX_ENET_FRAME_SIZE_WITHOUT_FCS + ENET_FCS_LENGTH) {
 233                         u32 ctrl0 = IXGB_READ_REG(hw, CTRL0);
 234
 235                         if (!(ctrl0 & IXGB_CTRL0_JFE)) {
 236                                 ctrl0 |= IXGB_CTRL0_JFE;
 237                                 IXGB_WRITE_REG(hw, CTRL0, ctrl0);
 238                         }
 239                 }
 240         }
 241
 242         clear_bit(__IXGB_DOWN, &adapter->flags);
 243
 244         napi_enable(&adapter->napi);
 245         ixgb_irq_enable(adapter);
 246
 247         netif_wake_queue(netdev);
 248
 249         mod_timer(&adapter->watchdog_timer, jiffies);
 250
 251         return 0;
 252 }
 253
 254 void
 255 ixgb_down(struct ixgb_adapter *adapter, bool kill_watchdog)
 256 {
 257         struct net_device *netdev = adapter->netdev;
 258
 259         /* prevent the interrupt handler from restarting watchdog */
 260         set_bit(__IXGB_DOWN, &adapter->flags);
 261
 262         netif_carrier_off(netdev);
 263
 264         napi_disable(&adapter->napi);
 265         /* waiting for NAPI to complete can re-enable interrupts */
 266         ixgb_irq_disable(adapter);
 267         free_irq(adapter->pdev->irq, netdev);
 268
 269         if (adapter->have_msi)
 270                 pci_disable_msi(adapter->pdev);
 271
 272         if (kill_watchdog)
 273                 del_timer_sync(&adapter->watchdog_timer);
 274
 275         adapter->link_speed = 0;
 276         adapter->link_duplex = 0;
 277         netif_stop_queue(netdev);
 278
 279         ixgb_reset(adapter);
 280         ixgb_clean_tx_ring(adapter);
 281         ixgb_clean_rx_ring(adapter);
 282 }
 283
 284 void
 285 ixgb_reset(struct ixgb_adapter *adapter)
 286 {
 287         struct ixgb_hw *hw = &adapter->hw;
 288
 289         ixgb_adapter_stop(hw);
 290         if (!ixgb_init_hw(hw))
 291                 netif_err(adapter, probe, adapter->netdev, "ixgb_init_hw failed\n");
 292
 293         /* restore frame size information */
 294         IXGB_WRITE_REG(hw, MFS, hw->max_frame_size << IXGB_MFS_SHIFT);
 295         if (hw->max_frame_size >
 296             IXGB_MAX_ENET_FRAME_SIZE_WITHOUT_FCS + ENET_FCS_LENGTH) {
 297                 u32 ctrl0 = IXGB_READ_REG(hw, CTRL0);
 298                 if (!(ctrl0 & IXGB_CTRL0_JFE)) {
 299                         ctrl0 |= IXGB_CTRL0_JFE;
 300                         IXGB_WRITE_REG(hw, CTRL0, ctrl0);
 301                 }
 302         }
 303 }
 304
 305 static netdev_features_t
 306 ixgb_fix_features(struct net_device *netdev, netdev_features_t features)
 307 {
 308         /*
 309          * Tx VLAN insertion does not work per HW design when Rx stripping is
 310          * disabled.
 311          */
 312         if (!(features & NETIF_F_HW_VLAN_CTAG_RX))
 313                 features &= ~NETIF_F_HW_VLAN_CTAG_TX;
 314
 315         return features;
 316 }
 317
 318 static int
 319 ixgb_set_features(struct net_device *netdev, netdev_features_t features)
 320 {
 321         struct ixgb_adapter *adapter = netdev_priv(netdev);
 322         netdev_features_t changed = features ^ netdev->features;
 323
 324         if (!(changed & (NETIF_F_RXCSUM|NETIF_F_HW_VLAN_CTAG_RX)))
 325                 return 0;
 326
 327         adapter->rx_csum = !!(features & NETIF_F_RXCSUM);
 328
 329         if (netif_running(netdev)) {
 330                 ixgb_down(adapter, true);
 331                 ixgb_up(adapter);
 332                 ixgb_set_speed_duplex(netdev);
 333         } else
 334                 ixgb_reset(adapter);
 335
 336         return 0;
 337 }
 338
 339
 340 static const struct net_device_ops ixgb_netdev_ops = {
 341         .ndo_open               = ixgb_open,
 342         .ndo_stop               = ixgb_close,
 343         .ndo_start_xmit         = ixgb_xmit_frame,
 344         .ndo_set_rx_mode        = ixgb_set_multi,
 345         .ndo_validate_addr      = eth_validate_addr,
 346         .ndo_set_mac_address    = ixgb_set_mac,
 347         .ndo_change_mtu         = ixgb_change_mtu,
 348         .ndo_tx_timeout         = ixgb_tx_timeout,
 349         .ndo_vlan_rx_add_vid    = ixgb_vlan_rx_add_vid,
 350         .ndo_vlan_rx_kill_vid   = ixgb_vlan_rx_kill_vid,
 351 #ifdef CONFIG_NET_POLL_CONTROLLER
 352         .ndo_poll_controller    = ixgb_netpoll,
 353 #endif
 354         .ndo_fix_features       = ixgb_fix_features,
 355         .ndo_set_features       = ixgb_set_features,
 356 };
 357
 358 /**
 359  * ixgb_probe - Device Initialization Routine
 360  * @pdev: PCI device information struct
 361  * @ent: entry in ixgb_pci_tbl
 362  *
 363  * Returns 0 on success, negative on failure
 364  *
 365  * ixgb_probe initializes an adapter identified by a pci_dev structure.
 366  * The OS initialization, configuring of the adapter private structure,
 367  * and a hardware reset occur.
 368  **/
 369
 370 static int
 371 ixgb_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
 372 {
 373         struct net_device *netdev = NULL;
 374         struct ixgb_adapter *adapter;
 375         static int cards_found = 0;
 376         int pci_using_dac;
 377         int i;
 378         int err;
 379
 380         err = pci_enable_device(pdev);
 381         if (err)
 382                 return err;
 383
 384         pci_using_dac = 0;
 385         err = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(64));
 386         if (!err) {
 387                 pci_using_dac = 1;
 388         } else {
 389                 err = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32));
 390                 if (err) {
 391                         pr_err("No usable DMA configuration, aborting\n");
 392                         goto err_dma_mask;
 393                 }
 394         }
 395
 396         err = pci_request_regions(pdev, ixgb_driver_name);
 397         if (err)
 398                 goto err_request_regions;
 399
 400         pci_set_master(pdev);
 401
 402         netdev = alloc_etherdev(sizeof(struct ixgb_adapter));
 403         if (!netdev) {
 404                 err = -ENOMEM;
 405                 goto err_alloc_etherdev;
 406         }
 407
 408         SET_NETDEV_DEV(netdev, &pdev->dev);
 409
 410         pci_set_drvdata(pdev, netdev);
 411         adapter = netdev_priv(netdev);
 412         adapter->netdev = netdev;
 413         adapter->pdev = pdev;
 414         adapter->hw.back = adapter;
 415         adapter->msg_enable = netif_msg_init(debug, DEFAULT_MSG_ENABLE);
 416
 417         adapter->hw.hw_addr = pci_ioremap_bar(pdev, BAR_0);
 418         if (!adapter->hw.hw_addr) {
 419                 err = -EIO;
 420                 goto err_ioremap;
 421         }
 422
 423         for (i = BAR_1; i <= BAR_5; i++) {
 424                 if (pci_resource_len(pdev, i) == 0)
 425                         continue;
 426                 if (pci_resource_flags(pdev, i) & IORESOURCE_IO) {
 427                         adapter->hw.io_base = pci_resource_start(pdev, i);
 428                         break;
 429                 }
 430         }
 431
 432         netdev->netdev_ops = &ixgb_netdev_ops;
 433         ixgb_set_ethtool_ops(netdev);
 434         netdev->watchdog_timeo = 5 * HZ;
 435         netif_napi_add(netdev, &adapter->napi, ixgb_clean, 64);
 436
 437         strncpy(netdev->name, pci_name(pdev), sizeof(netdev->name) - 1);
 438
 439         adapter->bd_number = cards_found;
 440         adapter->link_speed = 0;
 441         adapter->link_duplex = 0;
 442
 443         /* setup the private structure */
 444
 445         err = ixgb_sw_init(adapter);
 446         if (err)
 447                 goto err_sw_init;
 448
 449         netdev->hw_features = NETIF_F_SG |
 450                            NETIF_F_TSO |
 451                            NETIF_F_HW_CSUM |
 452                            NETIF_F_HW_VLAN_CTAG_TX |
 453                            NETIF_F_HW_VLAN_CTAG_RX;
 454         netdev->features = netdev->hw_features |
 455                            NETIF_F_HW_VLAN_CTAG_FILTER;
 456         netdev->hw_features |= NETIF_F_RXCSUM;
 457
 458         if (pci_using_dac) {
 459                 netdev->features |= NETIF_F_HIGHDMA;
 460                 netdev->vlan_features |= NETIF_F_HIGHDMA;
 461         }
 462
 463         /* MTU range: 68 - 16114 */
 464         netdev->min_mtu = ETH_MIN_MTU;
 465         netdev->max_mtu = IXGB_MAX_JUMBO_FRAME_SIZE - ETH_HLEN;
 466
 467         /* make sure the EEPROM is good */
 468
 469         if (!ixgb_validate_eeprom_checksum(&adapter->hw)) {
 470                 netif_err(adapter, probe, adapter->netdev,
 471                           "The EEPROM Checksum Is Not Valid\n");
 472                 err = -EIO;
 473                 goto err_eeprom;
 474         }
 475
 476         ixgb_get_ee_mac_addr(&adapter->hw, netdev->dev_addr);
 477
 478         if (!is_valid_ether_addr(netdev->dev_addr)) {
 479                 netif_err(adapter, probe, adapter->netdev, "Invalid MAC Address\n");
 480                 err = -EIO;
 481                 goto err_eeprom;
 482         }
 483
 484         adapter->part_num = ixgb_get_ee_pba_number(&adapter->hw);
 485
 486         timer_setup(&adapter->watchdog_timer, ixgb_watchdog, 0);
 487
 488         INIT_WORK(&adapter->tx_timeout_task, ixgb_tx_timeout_task);
 489
 490         strcpy(netdev->name, "eth%d");
 491         err = register_netdev(netdev);
 492         if (err)
 493                 goto err_register;
 494
 495         /* carrier off reporting is important to ethtool even BEFORE open */
 496         netif_carrier_off(netdev);
 497
 498         netif_info(adapter, probe, adapter->netdev,
 499                    "Intel(R) PRO/10GbE Network Connection\n");
 500         ixgb_check_options(adapter);
 501         /* reset the hardware with the new settings */
 502
 503         ixgb_reset(adapter);
 504
 505         cards_found++;
 506         return 0;
 507
 508 err_register:
 509 err_sw_init:
 510 err_eeprom:
 511         iounmap(adapter->hw.hw_addr);
 512 err_ioremap:
 513         free_netdev(netdev);
 514 err_alloc_etherdev:
 515         pci_release_regions(pdev);
 516 err_request_regions:
 517 err_dma_mask:
 518         pci_disable_device(pdev);
 519         return err;
 520 }
 521
 522 /**
 523  * ixgb_remove - Device Removal Routine
 524  * @pdev: PCI device information struct
 525  *
 526  * ixgb_remove is called by the PCI subsystem to alert the driver
 527  * that it should release a PCI device.  The could be caused by a
 528  * Hot-Plug event, or because the driver is going to be removed from
 529  * memory.
 530  **/
 531
 532 static void
 533 ixgb_remove(struct pci_dev *pdev)
 534 {
 535         struct net_device *netdev = pci_get_drvdata(pdev);
 536         struct ixgb_adapter *adapter = netdev_priv(netdev);
 537
 538         cancel_work_sync(&adapter->tx_timeout_task);
 539
 540         unregister_netdev(netdev);
 541
 542         iounmap(adapter->hw.hw_addr);
 543         pci_release_regions(pdev);
 544
 545         free_netdev(netdev);
 546         pci_disable_device(pdev);
 547 }
 548
 549 /**
 550  * ixgb_sw_init - Initialize general software structures (struct ixgb_adapter)
 551  * @adapter: board private structure to initialize
 552  *
 553  * ixgb_sw_init initializes the Adapter private data structure.
 554  * Fields are initialized based on PCI device information and
 555  * OS network device settings (MTU size).
 556  **/
 557
 558 static int
 559 ixgb_sw_init(struct ixgb_adapter *adapter)
 560 {
 561         struct ixgb_hw *hw = &adapter->hw;
 562         struct net_device *netdev = adapter->netdev;
 563         struct pci_dev *pdev = adapter->pdev;
 564
 565         /* PCI config space info */
 566
 567         hw->vendor_id = pdev->vendor;
 568         hw->device_id = pdev->device;
 569         hw->subsystem_vendor_id = pdev->subsystem_vendor;
 570         hw->subsystem_id = pdev->subsystem_device;
 571
 572         hw->max_frame_size = netdev->mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;
 573         adapter->rx_buffer_len = hw->max_frame_size + 8; /* + 8 for errata */
 574
 575         if ((hw->device_id == IXGB_DEVICE_ID_82597EX) ||
 576             (hw->device_id == IXGB_DEVICE_ID_82597EX_CX4) ||
 577             (hw->device_id == IXGB_DEVICE_ID_82597EX_LR) ||
 578             (hw->device_id == IXGB_DEVICE_ID_82597EX_SR))
 579                 hw->mac_type = ixgb_82597;
 580         else {
 581                 /* should never have loaded on this device */
 582                 netif_err(adapter, probe, adapter->netdev, "unsupported device id\n");
 583         }
 584
 585         /* enable flow control to be programmed */
 586         hw->fc.send_xon = 1;
 587
 588         set_bit(__IXGB_DOWN, &adapter->flags);
 589         return 0;
 590 }
 591
 592 /**
 593  * ixgb_open - Called when a network interface is made active
 594  * @netdev: network interface device structure
 595  *
 596  * Returns 0 on success, negative value on failure
 597  *
 598  * The open entry point is called when a network interface is made
 599  * active by the system (IFF_UP).  At this point all resources needed
 600  * for transmit and receive operations are allocated, the interrupt
 601  * handler is registered with the OS, the watchdog timer is started,
 602  * and the stack is notified that the interface is ready.
 603  **/
 604
 605 static int
 606 ixgb_open(struct net_device *netdev)
 607 {
 608         struct ixgb_adapter *adapter = netdev_priv(netdev);
 609         int err;
 610
 611         /* allocate transmit descriptors */
 612         err = ixgb_setup_tx_resources(adapter);
 613         if (err)
 614                 goto err_setup_tx;
 615
 616         netif_carrier_off(netdev);
 617
 618         /* allocate receive descriptors */
 619
 620         err = ixgb_setup_rx_resources(adapter);
 621         if (err)
 622                 goto err_setup_rx;
 623
 624         err = ixgb_up(adapter);
 625         if (err)
 626                 goto err_up;
 627
 628         netif_start_queue(netdev);
 629
 630         return 0;
 631
 632 err_up:
 633         ixgb_free_rx_resources(adapter);
 634 err_setup_rx:
 635         ixgb_free_tx_resources(adapter);
 636 err_setup_tx:
 637         ixgb_reset(adapter);
 638
 639         return err;
 640 }
 641
 642 /**
 643  * ixgb_close - Disables a network interface
 644  * @netdev: network interface device structure
 645  *
 646  * Returns 0, this is not allowed to fail
 647  *
 648  * The close entry point is called when an interface is de-activated
 649  * by the OS.  The hardware is still under the drivers control, but
 650  * needs to be disabled.  A global MAC reset is issued to stop the
 651  * hardware, and all transmit and receive resources are freed.
 652  **/
 653
 654 static int
 655 ixgb_close(struct net_device *netdev)
 656 {
 657         struct ixgb_adapter *adapter = netdev_priv(netdev);
 658
 659         ixgb_down(adapter, true);
 660
 661         ixgb_free_tx_resources(adapter);
 662         ixgb_free_rx_resources(adapter);
 663
 664         return 0;
 665 }
 666
 667 /**
 668  * ixgb_setup_tx_resources - allocate Tx resources (Descriptors)
 669  * @adapter: board private structure
 670  *
 671  * Return 0 on success, negative on failure
 672  **/
 673
 674 int
 675 ixgb_setup_tx_resources(struct ixgb_adapter *adapter)
 676 {
 677         struct ixgb_desc_ring *txdr = &adapter->tx_ring;
 678         struct pci_dev *pdev = adapter->pdev;
 679         int size;
 680
 681         size = sizeof(struct ixgb_buffer) * txdr->count;
 682         txdr->buffer_info = vzalloc(size);
 683         if (!txdr->buffer_info)
 684                 return -ENOMEM;
 685
 686         /* round up to nearest 4K */
 687
 688         txdr->size = txdr->count * sizeof(struct ixgb_tx_desc);
 689         txdr->size = ALIGN(txdr->size, 4096);
 690
 691         txdr->desc = dma_zalloc_coherent(&pdev->dev, txdr->size, &txdr->dma,
 692                                          GFP_KERNEL);
 693         if (!txdr->desc) {
 694                 vfree(txdr->buffer_info);
 695                 return -ENOMEM;
 696         }
 697
 698         txdr->next_to_use = 0;
 699         txdr->next_to_clean = 0;
 700
 701         return 0;
 702 }
 703
 704 /**
 705  * ixgb_configure_tx - Configure 82597 Transmit Unit after Reset.
 706  * @adapter: board private structure
 707  *
 708  * Configure the Tx unit of the MAC after a reset.
 709  **/
 710
 711 static void
 712 ixgb_configure_tx(struct ixgb_adapter *adapter)
 713 {
 714         u64 tdba = adapter->tx_ring.dma;
 715         u32 tdlen = adapter->tx_ring.count * sizeof(struct ixgb_tx_desc);
 716         u32 tctl;
 717         struct ixgb_hw *hw = &adapter->hw;
 718
 719         /* Setup the Base and Length of the Tx Descriptor Ring
 720          * tx_ring.dma can be either a 32 or 64 bit value
 721          */
 722
 723         IXGB_WRITE_REG(hw, TDBAL, (tdba & 0x00000000ffffffffULL));
 724         IXGB_WRITE_REG(hw, TDBAH, (tdba >> 32));
 725
 726         IXGB_WRITE_REG(hw, TDLEN, tdlen);
 727
 728         /* Setup the HW Tx Head and Tail descriptor pointers */
 729
 730         IXGB_WRITE_REG(hw, TDH, 0);
 731         IXGB_WRITE_REG(hw, TDT, 0);
 732
 733         /* don't set up txdctl, it induces performance problems if configured
 734          * incorrectly */
 735         /* Set the Tx Interrupt Delay register */
 736
 737         IXGB_WRITE_REG(hw, TIDV, adapter->tx_int_delay);
 738
 739         /* Program the Transmit Control Register */
 740
 741         tctl = IXGB_TCTL_TCE | IXGB_TCTL_TXEN | IXGB_TCTL_TPDE;
 742         IXGB_WRITE_REG(hw, TCTL, tctl);
 743
 744         /* Setup Transmit Descriptor Settings for this adapter */
 745         adapter->tx_cmd_type =
 746                 IXGB_TX_DESC_TYPE |
 747                 (adapter->tx_int_delay_enable ? IXGB_TX_DESC_CMD_IDE : 0);
 748 }
 749
 750 /**
 751  * ixgb_setup_rx_resources - allocate Rx resources (Descriptors)
 752  * @adapter: board private structure
 753  *
 754  * Returns 0 on success, negative on failure
 755  **/
 756
 757 int
 758 ixgb_setup_rx_resources(struct ixgb_adapter *adapter)
 759 {
 760         struct ixgb_desc_ring *rxdr = &adapter->rx_ring;
 761         struct pci_dev *pdev = adapter->pdev;
 762         int size;
 763
 764         size = sizeof(struct ixgb_buffer) * rxdr->count;
 765         rxdr->buffer_info = vzalloc(size);
 766         if (!rxdr->buffer_info)
 767                 return -ENOMEM;
 768
 769         /* Round up to nearest 4K */
 770
 771         rxdr->size = rxdr->count * sizeof(struct ixgb_rx_desc);
 772         rxdr->size = ALIGN(rxdr->size, 4096);
 773
 774         rxdr->desc = dma_alloc_coherent(&pdev->dev, rxdr->size, &rxdr->dma,
 775                                         GFP_KERNEL);
 776
 777         if (!rxdr->desc) {
 778                 vfree(rxdr->buffer_info);
 779                 return -ENOMEM;
 780         }
 781         memset(rxdr->desc, 0, rxdr->size);
 782
 783         rxdr->next_to_clean = 0;
 784         rxdr->next_to_use = 0;
 785
 786         return 0;
 787 }
 788
 789 /**
 790  * ixgb_setup_rctl - configure the receive control register
 791  * @adapter: Board private structure
 792  **/
 793
 794 static void
 795 ixgb_setup_rctl(struct ixgb_adapter *adapter)
 796 {
 797         u32 rctl;
 798
 799         rctl = IXGB_READ_REG(&adapter->hw, RCTL);
 800
 801         rctl &= ~(3 << IXGB_RCTL_MO_SHIFT);
 802
 803         rctl |=
 804                 IXGB_RCTL_BAM | IXGB_RCTL_RDMTS_1_2 |
 805                 IXGB_RCTL_RXEN | IXGB_RCTL_CFF |
 806                 (adapter->hw.mc_filter_type << IXGB_RCTL_MO_SHIFT);
 807
 808         rctl |= IXGB_RCTL_SECRC;
 809
 810         if (adapter->rx_buffer_len <= IXGB_RXBUFFER_2048)
 811                 rctl |= IXGB_RCTL_BSIZE_2048;
 812         else if (adapter->rx_buffer_len <= IXGB_RXBUFFER_4096)
 813                 rctl |= IXGB_RCTL_BSIZE_4096;
 814         else if (adapter->rx_buffer_len <= IXGB_RXBUFFER_8192)
 815                 rctl |= IXGB_RCTL_BSIZE_8192;
 816         else if (adapter->rx_buffer_len <= IXGB_RXBUFFER_16384)
 817                 rctl |= IXGB_RCTL_BSIZE_16384;
 818
 819         IXGB_WRITE_REG(&adapter->hw, RCTL, rctl);
 820 }
 821
 822 /**
 823  * ixgb_configure_rx - Configure 82597 Receive Unit after Reset.
 824  * @adapter: board private structure
 825  *
 826  * Configure the Rx unit of the MAC after a reset.
 827  **/
 828
 829 static void
 830 ixgb_configure_rx(struct ixgb_adapter *adapter)
 831 {
 832         u64 rdba = adapter->rx_ring.dma;
 833         u32 rdlen = adapter->rx_ring.count * sizeof(struct ixgb_rx_desc);
 834         struct ixgb_hw *hw = &adapter->hw;
 835         u32 rctl;
 836         u32 rxcsum;
 837
 838         /* make sure receives are disabled while setting up the descriptors */
 839
 840         rctl = IXGB_READ_REG(hw, RCTL);
 841         IXGB_WRITE_REG(hw, RCTL, rctl & ~IXGB_RCTL_RXEN);
 842
 843         /* set the Receive Delay Timer Register */
 844
 845         IXGB_WRITE_REG(hw, RDTR, adapter->rx_int_delay);
 846
 847         /* Setup the Base and Length of the Rx Descriptor Ring */
 848
 849         IXGB_WRITE_REG(hw, RDBAL, (rdba & 0x00000000ffffffffULL));
 850         IXGB_WRITE_REG(hw, RDBAH, (rdba >> 32));
 851
 852         IXGB_WRITE_REG(hw, RDLEN, rdlen);
 853
 854         /* Setup the HW Rx Head and Tail Descriptor Pointers */
 855         IXGB_WRITE_REG(hw, RDH, 0);
 856         IXGB_WRITE_REG(hw, RDT, 0);
 857
 858         /* due to the hardware errata with RXDCTL, we are unable to use any of
 859          * the performance enhancing features of it without causing other
 860          * subtle bugs, some of the bugs could include receive length
 861          * corruption at high data rates (WTHRESH > 0) and/or receive
 862          * descriptor ring irregularites (particularly in hardware cache) */
 863         IXGB_WRITE_REG(hw, RXDCTL, 0);
 864
 865         /* Enable Receive Checksum Offload for TCP and UDP */
 866         if (adapter->rx_csum) {
 867                 rxcsum = IXGB_READ_REG(hw, RXCSUM);
 868                 rxcsum |= IXGB_RXCSUM_TUOFL;
 869                 IXGB_WRITE_REG(hw, RXCSUM, rxcsum);
 870         }
 871
 872         /* Enable Receives */
 873
 874         IXGB_WRITE_REG(hw, RCTL, rctl);
 875 }
 876
 877 /**
 878  * ixgb_free_tx_resources - Free Tx Resources
 879  * @adapter: board private structure
 880  *
 881  * Free all transmit software resources
 882  **/
 883
 884 void
 885 ixgb_free_tx_resources(struct ixgb_adapter *adapter)
 886 {
 887         struct pci_dev *pdev = adapter->pdev;
 888
 889         ixgb_clean_tx_ring(adapter);
 890
 891         vfree(adapter->tx_ring.buffer_info);
 892         adapter->tx_ring.buffer_info = NULL;
 893
 894         dma_free_coherent(&pdev->dev, adapter->tx_ring.size,
 895                           adapter->tx_ring.desc, adapter->tx_ring.dma);
 896
 897         adapter->tx_ring.desc = NULL;
 898 }
 899
 900 static void
 901 ixgb_unmap_and_free_tx_resource(struct ixgb_adapter *adapter,
 902                                 struct ixgb_buffer *buffer_info)
 903 {
 904         if (buffer_info->dma) {
 905                 if (buffer_info->mapped_as_page)
 906                         dma_unmap_page(&adapter->pdev->dev, buffer_info->dma,
 907                                        buffer_info->length, DMA_TO_DEVICE);
 908                 else
 909                         dma_unmap_single(&adapter->pdev->dev, buffer_info->dma,
 910                                          buffer_info->length, DMA_TO_DEVICE);
 911                 buffer_info->dma = 0;
 912         }
 913
 914         if (buffer_info->skb) {
 915                 dev_kfree_skb_any(buffer_info->skb);
 916                 buffer_info->skb = NULL;
 917         }
 918         buffer_info->time_stamp = 0;
 919         /* these fields must always be initialized in tx
 920          * buffer_info->length = 0;
 921          * buffer_info->next_to_watch = 0; */
 922 }
 923
 924 /**
 925  * ixgb_clean_tx_ring - Free Tx Buffers
 926  * @adapter: board private structure
 927  **/
 928
 929 static void
 930 ixgb_clean_tx_ring(struct ixgb_adapter *adapter)
 931 {
 932         struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
 933         struct ixgb_buffer *buffer_info;
 934         unsigned long size;
 935         unsigned int i;
 936
 937         /* Free all the Tx ring sk_buffs */
 938
 939         for (i = 0; i < tx_ring->count; i++) {
 940                 buffer_info = &tx_ring->buffer_info[i];
 941                 ixgb_unmap_and_free_tx_resource(adapter, buffer_info);
 942         }
 943
 944         size = sizeof(struct ixgb_buffer) * tx_ring->count;
 945         memset(tx_ring->buffer_info, 0, size);
 946
 947         /* Zero out the descriptor ring */
 948
 949         memset(tx_ring->desc, 0, tx_ring->size);
 950
 951         tx_ring->next_to_use = 0;
 952         tx_ring->next_to_clean = 0;
 953
 954         IXGB_WRITE_REG(&adapter->hw, TDH, 0);
 955         IXGB_WRITE_REG(&adapter->hw, TDT, 0);
 956 }
 957
 958 /**
 959  * ixgb_free_rx_resources - Free Rx Resources
 960  * @adapter: board private structure
 961  *
 962  * Free all receive software resources
 963  **/
 964
 965 void
 966 ixgb_free_rx_resources(struct ixgb_adapter *adapter)
 967 {
 968         struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
 969         struct pci_dev *pdev = adapter->pdev;
 970
 971         ixgb_clean_rx_ring(adapter);
 972
 973         vfree(rx_ring->buffer_info);
 974         rx_ring->buffer_info = NULL;
 975
 976         dma_free_coherent(&pdev->dev, rx_ring->size, rx_ring->desc,
 977                           rx_ring->dma);
 978
 979         rx_ring->desc = NULL;
 980 }
 981
 982 /**
 983  * ixgb_clean_rx_ring - Free Rx Buffers
 984  * @adapter: board private structure
 985  **/
 986
 987 static void
 988 ixgb_clean_rx_ring(struct ixgb_adapter *adapter)
 989 {
 990         struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
 991         struct ixgb_buffer *buffer_info;
 992         struct pci_dev *pdev = adapter->pdev;
 993         unsigned long size;
 994         unsigned int i;
 995
 996         /* Free all the Rx ring sk_buffs */
 997
 998         for (i = 0; i < rx_ring->count; i++) {
 999                 buffer_info = &rx_ring->buffer_info[i];
1000                 if (buffer_info->dma) {
1001                         dma_unmap_single(&pdev->dev,
1002                                          buffer_info->dma,
1003                                          buffer_info->length,
1004                                          DMA_FROM_DEVICE);
1005                         buffer_info->dma = 0;
1006                         buffer_info->length = 0;
1007                 }
1008
1009                 if (buffer_info->skb) {
1010                         dev_kfree_skb(buffer_info->skb);
1011                         buffer_info->skb = NULL;
1012                 }
1013         }
1014
1015         size = sizeof(struct ixgb_buffer) * rx_ring->count;
1016         memset(rx_ring->buffer_info, 0, size);
1017
1018         /* Zero out the descriptor ring */
1019
1020         memset(rx_ring->desc, 0, rx_ring->size);
1021
1022         rx_ring->next_to_clean = 0;
1023         rx_ring->next_to_use = 0;
1024
1025         IXGB_WRITE_REG(&adapter->hw, RDH, 0);
1026         IXGB_WRITE_REG(&adapter->hw, RDT, 0);
1027 }
1028
1029 /**
1030  * ixgb_set_mac - Change the Ethernet Address of the NIC
1031  * @netdev: network interface device structure
1032  * @p: pointer to an address structure
1033  *
1034  * Returns 0 on success, negative on failure
1035  **/
1036
1037 static int
1038 ixgb_set_mac(struct net_device *netdev, void *p)
1039 {
1040         struct ixgb_adapter *adapter = netdev_priv(netdev);
1041         struct sockaddr *addr = p;
1042
1043         if (!is_valid_ether_addr(addr->sa_data))
1044                 return -EADDRNOTAVAIL;
1045
1046         memcpy(netdev->dev_addr, addr->sa_data, netdev->addr_len);
1047
1048         ixgb_rar_set(&adapter->hw, addr->sa_data, 0);
1049
1050         return 0;
1051 }
1052
1053 /**
1054  * ixgb_set_multi - Multicast and Promiscuous mode set
1055  * @netdev: network interface device structure
1056  *
1057  * The set_multi entry point is called whenever the multicast address
1058  * list or the network interface flags are updated.  This routine is
1059  * responsible for configuring the hardware for proper multicast,
1060  * promiscuous mode, and all-multi behavior.
1061  **/
1062
1063 static void
1064 ixgb_set_multi(struct net_device *netdev)
1065 {
1066         struct ixgb_adapter *adapter = netdev_priv(netdev);
1067         struct ixgb_hw *hw = &adapter->hw;
1068         struct netdev_hw_addr *ha;
1069         u32 rctl;
1070
1071         /* Check for Promiscuous and All Multicast modes */
1072
1073         rctl = IXGB_READ_REG(hw, RCTL);
1074
1075         if (netdev->flags & IFF_PROMISC) {
1076                 rctl |= (IXGB_RCTL_UPE | IXGB_RCTL_MPE);
1077                 /* disable VLAN filtering */
1078                 rctl &= ~IXGB_RCTL_CFIEN;
1079                 rctl &= ~IXGB_RCTL_VFE;
1080         } else {
1081                 if (netdev->flags & IFF_ALLMULTI) {
1082                         rctl |= IXGB_RCTL_MPE;
1083                         rctl &= ~IXGB_RCTL_UPE;
1084                 } else {
1085                         rctl &= ~(IXGB_RCTL_UPE | IXGB_RCTL_MPE);
1086                 }
1087                 /* enable VLAN filtering */
1088                 rctl |= IXGB_RCTL_VFE;
1089                 rctl &= ~IXGB_RCTL_CFIEN;
1090         }
1091
1092         if (netdev_mc_count(netdev) > IXGB_MAX_NUM_MULTICAST_ADDRESSES) {
1093                 rctl |= IXGB_RCTL_MPE;
1094                 IXGB_WRITE_REG(hw, RCTL, rctl);
1095         } else {
1096                 u8 *mta = kmalloc(IXGB_MAX_NUM_MULTICAST_ADDRESSES *
1097                               ETH_ALEN, GFP_ATOMIC);
1098                 u8 *addr;
1099                 if (!mta)
1100                         goto alloc_failed;
1101
1102                 IXGB_WRITE_REG(hw, RCTL, rctl);
1103
1104                 addr = mta;
1105                 netdev_for_each_mc_addr(ha, netdev) {
1106                         memcpy(addr, ha->addr, ETH_ALEN);
1107                         addr += ETH_ALEN;
1108                 }
1109
1110                 ixgb_mc_addr_list_update(hw, mta, netdev_mc_count(netdev), 0);
1111                 kfree(mta);
1112         }
1113
1114 alloc_failed:
1115         if (netdev->features & NETIF_F_HW_VLAN_CTAG_RX)
1116                 ixgb_vlan_strip_enable(adapter);
1117         else
1118                 ixgb_vlan_strip_disable(adapter);
1119
1120 }
1121
1122 /**
1123  * ixgb_watchdog - Timer Call-back
1124  * @data: pointer to netdev cast into an unsigned long
1125  **/
1126
1127 static void
1128 ixgb_watchdog(struct timer_list *t)
1129 {
1130         struct ixgb_adapter *adapter = from_timer(adapter, t, watchdog_timer);
1131         struct net_device *netdev = adapter->netdev;
1132         struct ixgb_desc_ring *txdr = &adapter->tx_ring;
1133
1134         ixgb_check_for_link(&adapter->hw);
1135
1136         if (ixgb_check_for_bad_link(&adapter->hw)) {
1137                 /* force the reset path */
1138                 netif_stop_queue(netdev);
1139         }
1140
1141         if (adapter->hw.link_up) {
1142                 if (!netif_carrier_ok(netdev)) {
1143                         netdev_info(netdev,
1144                                     "NIC Link is Up 10 Gbps Full Duplex, Flow Control: %s\n",
1145                                     (adapter->hw.fc.type == ixgb_fc_full) ?
1146                                     "RX/TX" :
1147                                     (adapter->hw.fc.type == ixgb_fc_rx_pause) ?
1148                                      "RX" :
1149                                     (adapter->hw.fc.type == ixgb_fc_tx_pause) ?
1150                                     "TX" : "None");
1151                         adapter->link_speed = 10000;
1152                         adapter->link_duplex = FULL_DUPLEX;
1153                         netif_carrier_on(netdev);
1154                 }
1155         } else {
1156                 if (netif_carrier_ok(netdev)) {
1157                         adapter->link_speed = 0;
1158                         adapter->link_duplex = 0;
1159                         netdev_info(netdev, "NIC Link is Down\n");
1160                         netif_carrier_off(netdev);
1161                 }
1162         }
1163
1164         ixgb_update_stats(adapter);
1165
1166         if (!netif_carrier_ok(netdev)) {
1167                 if (IXGB_DESC_UNUSED(txdr) + 1 < txdr->count) {
1168                         /* We've lost link, so the controller stops DMA,
1169                          * but we've got queued Tx work that's never going
1170                          * to get done, so reset controller to flush Tx.
1171                          * (Do the reset outside of interrupt context). */
1172                         schedule_work(&adapter->tx_timeout_task);
1173                         /* return immediately since reset is imminent */
1174                         return;
1175                 }
1176         }
1177
1178         /* Force detection of hung controller every watchdog period */
1179         adapter->detect_tx_hung = true;
1180
1181         /* generate an interrupt to force clean up of any stragglers */
1182         IXGB_WRITE_REG(&adapter->hw, ICS, IXGB_INT_TXDW);
1183
1184         /* Reset the timer */
1185         mod_timer(&adapter->watchdog_timer, jiffies + 2 * HZ);
1186 }
1187
1188 #define IXGB_TX_FLAGS_CSUM              0x00000001
1189 #define IXGB_TX_FLAGS_VLAN              0x00000002
1190 #define IXGB_TX_FLAGS_TSO               0x00000004
1191
1192 static int
1193 ixgb_tso(struct ixgb_adapter *adapter, struct sk_buff *skb)
1194 {
1195         struct ixgb_context_desc *context_desc;
1196         unsigned int i;
1197         u8 ipcss, ipcso, tucss, tucso, hdr_len;
1198         u16 ipcse, tucse, mss;
1199
1200         if (likely(skb_is_gso(skb))) {
1201                 struct ixgb_buffer *buffer_info;
1202                 struct iphdr *iph;
1203                 int err;
1204
1205                 err = skb_cow_head(skb, 0);
1206                 if (err < 0)
1207                         return err;
1208
1209                 hdr_len = skb_transport_offset(skb) + tcp_hdrlen(skb);
1210                 mss = skb_shinfo(skb)->gso_size;
1211                 iph = ip_hdr(skb);
1212                 iph->tot_len = 0;
1213                 iph->check = 0;
1214                 tcp_hdr(skb)->check = ~csum_tcpudp_magic(iph->saddr,
1215                                                          iph->daddr, 0,
1216                                                          IPPROTO_TCP, 0);
1217                 ipcss = skb_network_offset(skb);
1218                 ipcso = (void *)&(iph->check) - (void *)skb->data;
1219                 ipcse = skb_transport_offset(skb) - 1;
1220                 tucss = skb_transport_offset(skb);
1221                 tucso = (void *)&(tcp_hdr(skb)->check) - (void *)skb->data;
1222                 tucse = 0;
1223
1224                 i = adapter->tx_ring.next_to_use;
1225                 context_desc = IXGB_CONTEXT_DESC(adapter->tx_ring, i);
1226                 buffer_info = &adapter->tx_ring.buffer_info[i];
1227                 WARN_ON(buffer_info->dma != 0);
1228
1229                 context_desc->ipcss = ipcss;
1230                 context_desc->ipcso = ipcso;
1231                 context_desc->ipcse = cpu_to_le16(ipcse);
1232                 context_desc->tucss = tucss;
1233                 context_desc->tucso = tucso;
1234                 context_desc->tucse = cpu_to_le16(tucse);
1235                 context_desc->mss = cpu_to_le16(mss);
1236                 context_desc->hdr_len = hdr_len;
1237                 context_desc->status = 0;
1238                 context_desc->cmd_type_len = cpu_to_le32(
1239                                                   IXGB_CONTEXT_DESC_TYPE
1240                                                 | IXGB_CONTEXT_DESC_CMD_TSE
1241                                                 | IXGB_CONTEXT_DESC_CMD_IP
1242                                                 | IXGB_CONTEXT_DESC_CMD_TCP
1243                                                 | IXGB_CONTEXT_DESC_CMD_IDE
1244                                                 | (skb->len - (hdr_len)));
1245
1246
1247                 if (++i == adapter->tx_ring.count) i = 0;
1248                 adapter->tx_ring.next_to_use = i;
1249
1250                 return 1;
1251         }
1252
1253         return 0;
1254 }
1255
1256 static bool
1257 ixgb_tx_csum(struct ixgb_adapter *adapter, struct sk_buff *skb)
1258 {
1259         struct ixgb_context_desc *context_desc;
1260         unsigned int i;
1261         u8 css, cso;
1262
1263         if (likely(skb->ip_summed == CHECKSUM_PARTIAL)) {
1264                 struct ixgb_buffer *buffer_info;
1265                 css = skb_checksum_start_offset(skb);
1266                 cso = css + skb->csum_offset;
1267
1268                 i = adapter->tx_ring.next_to_use;
1269                 context_desc = IXGB_CONTEXT_DESC(adapter->tx_ring, i);
1270                 buffer_info = &adapter->tx_ring.buffer_info[i];
1271                 WARN_ON(buffer_info->dma != 0);
1272
1273                 context_desc->tucss = css;
1274                 context_desc->tucso = cso;
1275                 context_desc->tucse = 0;
1276                 /* zero out any previously existing data in one instruction */
1277                 *(u32 *)&(context_desc->ipcss) = 0;
1278                 context_desc->status = 0;
1279                 context_desc->hdr_len = 0;
1280                 context_desc->mss = 0;
1281                 context_desc->cmd_type_len =
1282                         cpu_to_le32(IXGB_CONTEXT_DESC_TYPE
1283                                     | IXGB_TX_DESC_CMD_IDE);
1284
1285                 if (++i == adapter->tx_ring.count) i = 0;
1286                 adapter->tx_ring.next_to_use = i;
1287
1288                 return true;
1289         }
1290
1291         return false;
1292 }
1293
1294 #define IXGB_MAX_TXD_PWR        14
1295 #define IXGB_MAX_DATA_PER_TXD   (1<<IXGB_MAX_TXD_PWR)
1296
1297 static int
1298 ixgb_tx_map(struct ixgb_adapter *adapter, struct sk_buff *skb,
1299             unsigned int first)
1300 {
1301         struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
1302         struct pci_dev *pdev = adapter->pdev;
1303         struct ixgb_buffer *buffer_info;
1304         int len = skb_headlen(skb);
1305         unsigned int offset = 0, size, count = 0, i;
1306         unsigned int mss = skb_shinfo(skb)->gso_size;
1307         unsigned int nr_frags = skb_shinfo(skb)->nr_frags;
1308         unsigned int f;
1309
1310         i = tx_ring->next_to_use;
1311
1312         while (len) {
1313                 buffer_info = &tx_ring->buffer_info[i];
1314                 size = min(len, IXGB_MAX_DATA_PER_TXD);
1315                 /* Workaround for premature desc write-backs
1316                  * in TSO mode.  Append 4-byte sentinel desc */
1317                 if (unlikely(mss && !nr_frags && size == len && size > 8))
1318                         size -= 4;
1319
1320                 buffer_info->length = size;
1321                 WARN_ON(buffer_info->dma != 0);
1322                 buffer_info->time_stamp = jiffies;
1323                 buffer_info->mapped_as_page = false;
1324                 buffer_info->dma = dma_map_single(&pdev->dev,
1325                                                   skb->data + offset,
1326                                                   size, DMA_TO_DEVICE);
1327                 if (dma_mapping_error(&pdev->dev, buffer_info->dma))
1328                         goto dma_error;
1329                 buffer_info->next_to_watch = 0;
1330
1331                 len -= size;
1332                 offset += size;
1333                 count++;
1334                 if (len) {
1335                         i++;
1336                         if (i == tx_ring->count)
1337                                 i = 0;
1338                 }
1339         }
1340
1341         for (f = 0; f < nr_frags; f++) {
1342                 const struct skb_frag_struct *frag;
1343
1344                 frag = &skb_shinfo(skb)->frags[f];
1345                 len = skb_frag_size(frag);
1346                 offset = 0;
1347
1348                 while (len) {
1349                         i++;
1350                         if (i == tx_ring->count)
1351                                 i = 0;
1352
1353                         buffer_info = &tx_ring->buffer_info[i];
1354                         size = min(len, IXGB_MAX_DATA_PER_TXD);
1355
1356                         /* Workaround for premature desc write-backs
1357                          * in TSO mode.  Append 4-byte sentinel desc */
1358                         if (unlikely(mss && (f == (nr_frags - 1))
1359                                      && size == len && size > 8))
1360                                 size -= 4;
1361
1362                         buffer_info->length = size;
1363                         buffer_info->time_stamp = jiffies;
1364                         buffer_info->mapped_as_page = true;
1365                         buffer_info->dma =
1366                                 skb_frag_dma_map(&pdev->dev, frag, offset, size,
1367                                                  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                 }
1376         }
1377         tx_ring->buffer_info[i].skb = skb;
1378         tx_ring->buffer_info[first].next_to_watch = i;
1379
1380         return count;
1381
1382 dma_error:
1383         dev_err(&pdev->dev, "TX DMA map failed\n");
1384         buffer_info->dma = 0;
1385         if (count)
1386                 count--;
1387
1388         while (count--) {
1389                 if (i==0)
1390                         i += tx_ring->count;
1391                 i--;
1392                 buffer_info = &tx_ring->buffer_info[i];
1393                 ixgb_unmap_and_free_tx_resource(adapter, buffer_info);
1394         }
1395
1396         return 0;
1397 }
1398
1399 static void
1400 ixgb_tx_queue(struct ixgb_adapter *adapter, int count, int vlan_id,int tx_flags)
1401 {
1402         struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
1403         struct ixgb_tx_desc *tx_desc = NULL;
1404         struct ixgb_buffer *buffer_info;
1405         u32 cmd_type_len = adapter->tx_cmd_type;
1406         u8 status = 0;
1407         u8 popts = 0;
1408         unsigned int i;
1409
1410         if (tx_flags & IXGB_TX_FLAGS_TSO) {
1411                 cmd_type_len |= IXGB_TX_DESC_CMD_TSE;
1412                 popts |= (IXGB_TX_DESC_POPTS_IXSM | IXGB_TX_DESC_POPTS_TXSM);
1413         }
1414
1415         if (tx_flags & IXGB_TX_FLAGS_CSUM)
1416                 popts |= IXGB_TX_DESC_POPTS_TXSM;
1417
1418         if (tx_flags & IXGB_TX_FLAGS_VLAN)
1419                 cmd_type_len |= IXGB_TX_DESC_CMD_VLE;
1420
1421         i = tx_ring->next_to_use;
1422
1423         while (count--) {
1424                 buffer_info = &tx_ring->buffer_info[i];
1425                 tx_desc = IXGB_TX_DESC(*tx_ring, i);
1426                 tx_desc->buff_addr = cpu_to_le64(buffer_info->dma);
1427                 tx_desc->cmd_type_len =
1428                         cpu_to_le32(cmd_type_len | buffer_info->length);
1429                 tx_desc->status = status;
1430                 tx_desc->popts = popts;
1431                 tx_desc->vlan = cpu_to_le16(vlan_id);
1432
1433                 if (++i == tx_ring->count) i = 0;
1434         }
1435
1436         tx_desc->cmd_type_len |=
1437                 cpu_to_le32(IXGB_TX_DESC_CMD_EOP | IXGB_TX_DESC_CMD_RS);
1438
1439         /* Force memory writes to complete before letting h/w
1440          * know there are new descriptors to fetch.  (Only
1441          * applicable for weak-ordered memory model archs,
1442          * such as IA-64). */
1443         wmb();
1444
1445         tx_ring->next_to_use = i;
1446         IXGB_WRITE_REG(&adapter->hw, TDT, i);
1447 }
1448
1449 static int __ixgb_maybe_stop_tx(struct net_device *netdev, int size)
1450 {
1451         struct ixgb_adapter *adapter = netdev_priv(netdev);
1452         struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
1453
1454         netif_stop_queue(netdev);
1455         /* Herbert's original patch had:
1456          *  smp_mb__after_netif_stop_queue();
1457          * but since that doesn't exist yet, just open code it. */
1458         smp_mb();
1459
1460         /* We need to check again in a case another CPU has just
1461          * made room available. */
1462         if (likely(IXGB_DESC_UNUSED(tx_ring) < size))
1463                 return -EBUSY;
1464
1465         /* A reprieve! */
1466         netif_start_queue(netdev);
1467         ++adapter->restart_queue;
1468         return 0;
1469 }
1470
1471 static int ixgb_maybe_stop_tx(struct net_device *netdev,
1472                               struct ixgb_desc_ring *tx_ring, int size)
1473 {
1474         if (likely(IXGB_DESC_UNUSED(tx_ring) >= size))
1475                 return 0;
1476         return __ixgb_maybe_stop_tx(netdev, size);
1477 }
1478
1479
1480 /* Tx Descriptors needed, worst case */
1481 #define TXD_USE_COUNT(S) (((S) >> IXGB_MAX_TXD_PWR) + \
1482                          (((S) & (IXGB_MAX_DATA_PER_TXD - 1)) ? 1 : 0))
1483 #define DESC_NEEDED TXD_USE_COUNT(IXGB_MAX_DATA_PER_TXD) /* skb->date */ + \
1484         MAX_SKB_FRAGS * TXD_USE_COUNT(PAGE_SIZE) + 1 /* for context */ \
1485         + 1 /* one more needed for sentinel TSO workaround */
1486
1487 static netdev_tx_t
1488 ixgb_xmit_frame(struct sk_buff *skb, struct net_device *netdev)
1489 {
1490         struct ixgb_adapter *adapter = netdev_priv(netdev);
1491         unsigned int first;
1492         unsigned int tx_flags = 0;
1493         int vlan_id = 0;
1494         int count = 0;
1495         int tso;
1496
1497         if (test_bit(__IXGB_DOWN, &adapter->flags)) {
1498                 dev_kfree_skb_any(skb);
1499                 return NETDEV_TX_OK;
1500         }
1501
1502         if (skb->len <= 0) {
1503                 dev_kfree_skb_any(skb);
1504                 return NETDEV_TX_OK;
1505         }
1506
1507         if (unlikely(ixgb_maybe_stop_tx(netdev, &adapter->tx_ring,
1508                      DESC_NEEDED)))
1509                 return NETDEV_TX_BUSY;
1510
1511         if (skb_vlan_tag_present(skb)) {
1512                 tx_flags |= IXGB_TX_FLAGS_VLAN;
1513                 vlan_id = skb_vlan_tag_get(skb);
1514         }
1515
1516         first = adapter->tx_ring.next_to_use;
1517
1518         tso = ixgb_tso(adapter, skb);
1519         if (tso < 0) {
1520                 dev_kfree_skb_any(skb);
1521                 return NETDEV_TX_OK;
1522         }
1523
1524         if (likely(tso))
1525                 tx_flags |= IXGB_TX_FLAGS_TSO;
1526         else if (ixgb_tx_csum(adapter, skb))
1527                 tx_flags |= IXGB_TX_FLAGS_CSUM;
1528
1529         count = ixgb_tx_map(adapter, skb, first);
1530
1531         if (count) {
1532                 ixgb_tx_queue(adapter, count, vlan_id, tx_flags);
1533                 /* Make sure there is space in the ring for the next send. */
1534                 ixgb_maybe_stop_tx(netdev, &adapter->tx_ring, DESC_NEEDED);
1535
1536         } else {
1537                 dev_kfree_skb_any(skb);
1538                 adapter->tx_ring.buffer_info[first].time_stamp = 0;
1539                 adapter->tx_ring.next_to_use = first;
1540         }
1541
1542         return NETDEV_TX_OK;
1543 }
1544
1545 /**
1546  * ixgb_tx_timeout - Respond to a Tx Hang
1547  * @netdev: network interface device structure
1548  **/
1549
1550 static void
1551 ixgb_tx_timeout(struct net_device *netdev)
1552 {
1553         struct ixgb_adapter *adapter = netdev_priv(netdev);
1554
1555         /* Do the reset outside of interrupt context */
1556         schedule_work(&adapter->tx_timeout_task);
1557 }
1558
1559 static void
1560 ixgb_tx_timeout_task(struct work_struct *work)
1561 {
1562         struct ixgb_adapter *adapter =
1563                 container_of(work, struct ixgb_adapter, tx_timeout_task);
1564
1565         adapter->tx_timeout_count++;
1566         ixgb_down(adapter, true);
1567         ixgb_up(adapter);
1568 }
1569
1570 /**
1571  * ixgb_change_mtu - Change the Maximum Transfer Unit
1572  * @netdev: network interface device structure
1573  * @new_mtu: new value for maximum frame size
1574  *
1575  * Returns 0 on success, negative on failure
1576  **/
1577
1578 static int
1579 ixgb_change_mtu(struct net_device *netdev, int new_mtu)
1580 {
1581         struct ixgb_adapter *adapter = netdev_priv(netdev);
1582         int max_frame = new_mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;
1583
1584         if (netif_running(netdev))
1585                 ixgb_down(adapter, true);
1586
1587         adapter->rx_buffer_len = max_frame + 8; /* + 8 for errata */
1588
1589         netdev->mtu = new_mtu;
1590
1591         if (netif_running(netdev))
1592                 ixgb_up(adapter);
1593
1594         return 0;
1595 }
1596
1597 /**
1598  * ixgb_update_stats - Update the board statistics counters.
1599  * @adapter: board private structure
1600  **/
1601
1602 void
1603 ixgb_update_stats(struct ixgb_adapter *adapter)
1604 {
1605         struct net_device *netdev = adapter->netdev;
1606         struct pci_dev *pdev = adapter->pdev;
1607
1608         /* Prevent stats update while adapter is being reset */
1609         if (pci_channel_offline(pdev))
1610                 return;
1611
1612         if ((netdev->flags & IFF_PROMISC) || (netdev->flags & IFF_ALLMULTI) ||
1613            (netdev_mc_count(netdev) > IXGB_MAX_NUM_MULTICAST_ADDRESSES)) {
1614                 u64 multi = IXGB_READ_REG(&adapter->hw, MPRCL);
1615                 u32 bcast_l = IXGB_READ_REG(&adapter->hw, BPRCL);
1616                 u32 bcast_h = IXGB_READ_REG(&adapter->hw, BPRCH);
1617                 u64 bcast = ((u64)bcast_h << 32) | bcast_l;
1618
1619                 multi |= ((u64)IXGB_READ_REG(&adapter->hw, MPRCH) << 32);
1620                 /* fix up multicast stats by removing broadcasts */
1621                 if (multi >= bcast)
1622                         multi -= bcast;
1623
1624                 adapter->stats.mprcl += (multi & 0xFFFFFFFF);
1625                 adapter->stats.mprch += (multi >> 32);
1626                 adapter->stats.bprcl += bcast_l;
1627                 adapter->stats.bprch += bcast_h;
1628         } else {
1629                 adapter->stats.mprcl += IXGB_READ_REG(&adapter->hw, MPRCL);
1630                 adapter->stats.mprch += IXGB_READ_REG(&adapter->hw, MPRCH);
1631                 adapter->stats.bprcl += IXGB_READ_REG(&adapter->hw, BPRCL);
1632                 adapter->stats.bprch += IXGB_READ_REG(&adapter->hw, BPRCH);
1633         }
1634         adapter->stats.tprl += IXGB_READ_REG(&adapter->hw, TPRL);
1635         adapter->stats.tprh += IXGB_READ_REG(&adapter->hw, TPRH);
1636         adapter->stats.gprcl += IXGB_READ_REG(&adapter->hw, GPRCL);
1637         adapter->stats.gprch += IXGB_READ_REG(&adapter->hw, GPRCH);
1638         adapter->stats.uprcl += IXGB_READ_REG(&adapter->hw, UPRCL);
1639         adapter->stats.uprch += IXGB_READ_REG(&adapter->hw, UPRCH);
1640         adapter->stats.vprcl += IXGB_READ_REG(&adapter->hw, VPRCL);
1641         adapter->stats.vprch += IXGB_READ_REG(&adapter->hw, VPRCH);
1642         adapter->stats.jprcl += IXGB_READ_REG(&adapter->hw, JPRCL);
1643         adapter->stats.jprch += IXGB_READ_REG(&adapter->hw, JPRCH);
1644         adapter->stats.gorcl += IXGB_READ_REG(&adapter->hw, GORCL);
1645         adapter->stats.gorch += IXGB_READ_REG(&adapter->hw, GORCH);
1646         adapter->stats.torl += IXGB_READ_REG(&adapter->hw, TORL);
1647         adapter->stats.torh += IXGB_READ_REG(&adapter->hw, TORH);
1648         adapter->stats.rnbc += IXGB_READ_REG(&adapter->hw, RNBC);
1649         adapter->stats.ruc += IXGB_READ_REG(&adapter->hw, RUC);
1650         adapter->stats.roc += IXGB_READ_REG(&adapter->hw, ROC);
1651         adapter->stats.rlec += IXGB_READ_REG(&adapter->hw, RLEC);
1652         adapter->stats.crcerrs += IXGB_READ_REG(&adapter->hw, CRCERRS);
1653         adapter->stats.icbc += IXGB_READ_REG(&adapter->hw, ICBC);
1654         adapter->stats.ecbc += IXGB_READ_REG(&adapter->hw, ECBC);
1655         adapter->stats.mpc += IXGB_READ_REG(&adapter->hw, MPC);
1656         adapter->stats.tptl += IXGB_READ_REG(&adapter->hw, TPTL);
1657         adapter->stats.tpth += IXGB_READ_REG(&adapter->hw, TPTH);
1658         adapter->stats.gptcl += IXGB_READ_REG(&adapter->hw, GPTCL);
1659         adapter->stats.gptch += IXGB_READ_REG(&adapter->hw, GPTCH);
1660         adapter->stats.bptcl += IXGB_READ_REG(&adapter->hw, BPTCL);
1661         adapter->stats.bptch += IXGB_READ_REG(&adapter->hw, BPTCH);
1662         adapter->stats.mptcl += IXGB_READ_REG(&adapter->hw, MPTCL);
1663         adapter->stats.mptch += IXGB_READ_REG(&adapter->hw, MPTCH);
1664         adapter->stats.uptcl += IXGB_READ_REG(&adapter->hw, UPTCL);
1665         adapter->stats.uptch += IXGB_READ_REG(&adapter->hw, UPTCH);
1666         adapter->stats.vptcl += IXGB_READ_REG(&adapter->hw, VPTCL);
1667         adapter->stats.vptch += IXGB_READ_REG(&adapter->hw, VPTCH);
1668         adapter->stats.jptcl += IXGB_READ_REG(&adapter->hw, JPTCL);
1669         adapter->stats.jptch += IXGB_READ_REG(&adapter->hw, JPTCH);
1670         adapter->stats.gotcl += IXGB_READ_REG(&adapter->hw, GOTCL);
1671         adapter->stats.gotch += IXGB_READ_REG(&adapter->hw, GOTCH);
1672         adapter->stats.totl += IXGB_READ_REG(&adapter->hw, TOTL);
1673         adapter->stats.toth += IXGB_READ_REG(&adapter->hw, TOTH);
1674         adapter->stats.dc += IXGB_READ_REG(&adapter->hw, DC);
1675         adapter->stats.plt64c += IXGB_READ_REG(&adapter->hw, PLT64C);
1676         adapter->stats.tsctc += IXGB_READ_REG(&adapter->hw, TSCTC);
1677         adapter->stats.tsctfc += IXGB_READ_REG(&adapter->hw, TSCTFC);
1678         adapter->stats.ibic += IXGB_READ_REG(&adapter->hw, IBIC);
1679         adapter->stats.rfc += IXGB_READ_REG(&adapter->hw, RFC);
1680         adapter->stats.lfc += IXGB_READ_REG(&adapter->hw, LFC);
1681         adapter->stats.pfrc += IXGB_READ_REG(&adapter->hw, PFRC);
1682         adapter->stats.pftc += IXGB_READ_REG(&adapter->hw, PFTC);
1683         adapter->stats.mcfrc += IXGB_READ_REG(&adapter->hw, MCFRC);
1684         adapter->stats.mcftc += IXGB_READ_REG(&adapter->hw, MCFTC);
1685         adapter->stats.xonrxc += IXGB_READ_REG(&adapter->hw, XONRXC);
1686         adapter->stats.xontxc += IXGB_READ_REG(&adapter->hw, XONTXC);
1687         adapter->stats.xoffrxc += IXGB_READ_REG(&adapter->hw, XOFFRXC);
1688         adapter->stats.xofftxc += IXGB_READ_REG(&adapter->hw, XOFFTXC);
1689         adapter->stats.rjc += IXGB_READ_REG(&adapter->hw, RJC);
1690
1691         /* Fill out the OS statistics structure */
1692
1693         netdev->stats.rx_packets = adapter->stats.gprcl;
1694         netdev->stats.tx_packets = adapter->stats.gptcl;
1695         netdev->stats.rx_bytes = adapter->stats.gorcl;
1696         netdev->stats.tx_bytes = adapter->stats.gotcl;
1697         netdev->stats.multicast = adapter->stats.mprcl;
1698         netdev->stats.collisions = 0;
1699
1700         /* ignore RLEC as it reports errors for padded (<64bytes) frames
1701          * with a length in the type/len field */
1702         netdev->stats.rx_errors =
1703             /* adapter->stats.rnbc + */ adapter->stats.crcerrs +
1704             adapter->stats.ruc +
1705             adapter->stats.roc /*+ adapter->stats.rlec */  +
1706             adapter->stats.icbc +
1707             adapter->stats.ecbc + adapter->stats.mpc;
1708
1709         /* see above
1710          * netdev->stats.rx_length_errors = adapter->stats.rlec;
1711          */
1712
1713         netdev->stats.rx_crc_errors = adapter->stats.crcerrs;
1714         netdev->stats.rx_fifo_errors = adapter->stats.mpc;
1715         netdev->stats.rx_missed_errors = adapter->stats.mpc;
1716         netdev->stats.rx_over_errors = adapter->stats.mpc;
1717
1718         netdev->stats.tx_errors = 0;
1719         netdev->stats.rx_frame_errors = 0;
1720         netdev->stats.tx_aborted_errors = 0;
1721         netdev->stats.tx_carrier_errors = 0;
1722         netdev->stats.tx_fifo_errors = 0;
1723         netdev->stats.tx_heartbeat_errors = 0;
1724         netdev->stats.tx_window_errors = 0;
1725 }
1726
1727 #define IXGB_MAX_INTR 10
1728 /**
1729  * ixgb_intr - Interrupt Handler
1730  * @irq: interrupt number
1731  * @data: pointer to a network interface device structure
1732  **/
1733
1734 static irqreturn_t
1735 ixgb_intr(int irq, void *data)
1736 {
1737         struct net_device *netdev = data;
1738         struct ixgb_adapter *adapter = netdev_priv(netdev);
1739         struct ixgb_hw *hw = &adapter->hw;
1740         u32 icr = IXGB_READ_REG(hw, ICR);
1741
1742         if (unlikely(!icr))
1743                 return IRQ_NONE;  /* Not our interrupt */
1744
1745         if (unlikely(icr & (IXGB_INT_RXSEQ | IXGB_INT_LSC)))
1746                 if (!test_bit(__IXGB_DOWN, &adapter->flags))
1747                         mod_timer(&adapter->watchdog_timer, jiffies);
1748
1749         if (napi_schedule_prep(&adapter->napi)) {
1750
1751                 /* Disable interrupts and register for poll. The flush
1752                   of the posted write is intentionally left out.
1753                 */
1754
1755                 IXGB_WRITE_REG(&adapter->hw, IMC, ~0);
1756                 __napi_schedule(&adapter->napi);
1757         }
1758         return IRQ_HANDLED;
1759 }
1760
1761 /**
1762  * ixgb_clean - NAPI Rx polling callback
1763  * @adapter: board private structure
1764  **/
1765
1766 static int
1767 ixgb_clean(struct napi_struct *napi, int budget)
1768 {
1769         struct ixgb_adapter *adapter = container_of(napi, struct ixgb_adapter, napi);
1770         int work_done = 0;
1771
1772         ixgb_clean_tx_irq(adapter);
1773         ixgb_clean_rx_irq(adapter, &work_done, budget);
1774
1775         /* If budget not fully consumed, exit the polling mode */
1776         if (work_done < budget) {
1777                 napi_complete_done(napi, work_done);
1778                 if (!test_bit(__IXGB_DOWN, &adapter->flags))
1779                         ixgb_irq_enable(adapter);
1780         }
1781
1782         return work_done;
1783 }
1784
1785 /**
1786  * ixgb_clean_tx_irq - Reclaim resources after transmit completes
1787  * @adapter: board private structure
1788  **/
1789
1790 static bool
1791 ixgb_clean_tx_irq(struct ixgb_adapter *adapter)
1792 {
1793         struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
1794         struct net_device *netdev = adapter->netdev;
1795         struct ixgb_tx_desc *tx_desc, *eop_desc;
1796         struct ixgb_buffer *buffer_info;
1797         unsigned int i, eop;
1798         bool cleaned = false;
1799
1800         i = tx_ring->next_to_clean;
1801         eop = tx_ring->buffer_info[i].next_to_watch;
1802         eop_desc = IXGB_TX_DESC(*tx_ring, eop);
1803
1804         while (eop_desc->status & IXGB_TX_DESC_STATUS_DD) {
1805
1806                 rmb(); /* read buffer_info after eop_desc */
1807                 for (cleaned = false; !cleaned; ) {
1808                         tx_desc = IXGB_TX_DESC(*tx_ring, i);
1809                         buffer_info = &tx_ring->buffer_info[i];
1810
1811                         if (tx_desc->popts &
1812                            (IXGB_TX_DESC_POPTS_TXSM |
1813                             IXGB_TX_DESC_POPTS_IXSM))
1814                                 adapter->hw_csum_tx_good++;
1815
1816                         ixgb_unmap_and_free_tx_resource(adapter, buffer_info);
1817
1818                         *(u32 *)&(tx_desc->status) = 0;
1819
1820                         cleaned = (i == eop);
1821                         if (++i == tx_ring->count) i = 0;
1822                 }
1823
1824                 eop = tx_ring->buffer_info[i].next_to_watch;
1825                 eop_desc = IXGB_TX_DESC(*tx_ring, eop);
1826         }
1827
1828         tx_ring->next_to_clean = i;
1829
1830         if (unlikely(cleaned && netif_carrier_ok(netdev) &&
1831                      IXGB_DESC_UNUSED(tx_ring) >= DESC_NEEDED)) {
1832                 /* Make sure that anybody stopping the queue after this
1833                  * sees the new next_to_clean. */
1834                 smp_mb();
1835
1836                 if (netif_queue_stopped(netdev) &&
1837                     !(test_bit(__IXGB_DOWN, &adapter->flags))) {
1838                         netif_wake_queue(netdev);
1839                         ++adapter->restart_queue;
1840                 }
1841         }
1842
1843         if (adapter->detect_tx_hung) {
1844                 /* detect a transmit hang in hardware, this serializes the
1845                  * check with the clearing of time_stamp and movement of i */
1846                 adapter->detect_tx_hung = false;
1847                 if (tx_ring->buffer_info[eop].time_stamp &&
1848                    time_after(jiffies, tx_ring->buffer_info[eop].time_stamp + HZ)
1849                    && !(IXGB_READ_REG(&adapter->hw, STATUS) &
1850                         IXGB_STATUS_TXOFF)) {
1851                         /* detected Tx unit hang */
1852                         netif_err(adapter, drv, adapter->netdev,
1853                                   "Detected Tx Unit Hang\n"
1854                                   "  TDH                  <%x>\n"
1855                                   "  TDT                  <%x>\n"
1856                                   "  next_to_use          <%x>\n"
1857                                   "  next_to_clean        <%x>\n"
1858                                   "buffer_info[next_to_clean]\n"
1859                                   "  time_stamp           <%lx>\n"
1860                                   "  next_to_watch        <%x>\n"
1861                                   "  jiffies              <%lx>\n"
1862                                   "  next_to_watch.status <%x>\n",
1863                                   IXGB_READ_REG(&adapter->hw, TDH),
1864                                   IXGB_READ_REG(&adapter->hw, TDT),
1865                                   tx_ring->next_to_use,
1866                                   tx_ring->next_to_clean,
1867                                   tx_ring->buffer_info[eop].time_stamp,
1868                                   eop,
1869                                   jiffies,
1870                                   eop_desc->status);
1871                         netif_stop_queue(netdev);
1872                 }
1873         }
1874
1875         return cleaned;
1876 }
1877
1878 /**
1879  * ixgb_rx_checksum - Receive Checksum Offload for 82597.
1880  * @adapter: board private structure
1881  * @rx_desc: receive descriptor
1882  * @sk_buff: socket buffer with received data
1883  **/
1884
1885 static void
1886 ixgb_rx_checksum(struct ixgb_adapter *adapter,
1887                  struct ixgb_rx_desc *rx_desc,
1888                  struct sk_buff *skb)
1889 {
1890         /* Ignore Checksum bit is set OR
1891          * TCP Checksum has not been calculated
1892          */
1893         if ((rx_desc->status & IXGB_RX_DESC_STATUS_IXSM) ||
1894            (!(rx_desc->status & IXGB_RX_DESC_STATUS_TCPCS))) {
1895                 skb_checksum_none_assert(skb);
1896                 return;
1897         }
1898
1899         /* At this point we know the hardware did the TCP checksum */
1900         /* now look at the TCP checksum error bit */
1901         if (rx_desc->errors & IXGB_RX_DESC_ERRORS_TCPE) {
1902                 /* let the stack verify checksum errors */
1903                 skb_checksum_none_assert(skb);
1904                 adapter->hw_csum_rx_error++;
1905         } else {
1906                 /* TCP checksum is good */
1907                 skb->ip_summed = CHECKSUM_UNNECESSARY;
1908                 adapter->hw_csum_rx_good++;
1909         }
1910 }
1911
1912 /*
1913  * this should improve performance for small packets with large amounts
1914  * of reassembly being done in the stack
1915  */
1916 static void ixgb_check_copybreak(struct napi_struct *napi,
1917                                  struct ixgb_buffer *buffer_info,
1918                                  u32 length, struct sk_buff **skb)
1919 {
1920         struct sk_buff *new_skb;
1921
1922         if (length > copybreak)
1923                 return;
1924
1925         new_skb = napi_alloc_skb(napi, length);
1926         if (!new_skb)
1927                 return;
1928
1929         skb_copy_to_linear_data_offset(new_skb, -NET_IP_ALIGN,
1930                                        (*skb)->data - NET_IP_ALIGN,
1931                                        length + NET_IP_ALIGN);
1932         /* save the skb in buffer_info as good */
1933         buffer_info->skb = *skb;
1934         *skb = new_skb;
1935 }
1936
1937 /**
1938  * ixgb_clean_rx_irq - Send received data up the network stack,
1939  * @adapter: board private structure
1940  **/
1941
1942 static bool
1943 ixgb_clean_rx_irq(struct ixgb_adapter *adapter, int *work_done, int work_to_do)
1944 {
1945         struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
1946         struct net_device *netdev = adapter->netdev;
1947         struct pci_dev *pdev = adapter->pdev;
1948         struct ixgb_rx_desc *rx_desc, *next_rxd;
1949         struct ixgb_buffer *buffer_info, *next_buffer, *next2_buffer;
1950         u32 length;
1951         unsigned int i, j;
1952         int cleaned_count = 0;
1953         bool cleaned = false;
1954
1955         i = rx_ring->next_to_clean;
1956         rx_desc = IXGB_RX_DESC(*rx_ring, i);
1957         buffer_info = &rx_ring->buffer_info[i];
1958
1959         while (rx_desc->status & IXGB_RX_DESC_STATUS_DD) {
1960                 struct sk_buff *skb;
1961                 u8 status;
1962
1963                 if (*work_done >= work_to_do)
1964                         break;
1965
1966                 (*work_done)++;
1967                 rmb();  /* read descriptor and rx_buffer_info after status DD */
1968                 status = rx_desc->status;
1969                 skb = buffer_info->skb;
1970                 buffer_info->skb = NULL;
1971
1972                 prefetch(skb->data - NET_IP_ALIGN);
1973
1974                 if (++i == rx_ring->count)
1975                         i = 0;
1976                 next_rxd = IXGB_RX_DESC(*rx_ring, i);
1977                 prefetch(next_rxd);
1978
1979                 j = i + 1;
1980                 if (j == rx_ring->count)
1981                         j = 0;
1982                 next2_buffer = &rx_ring->buffer_info[j];
1983                 prefetch(next2_buffer);
1984
1985                 next_buffer = &rx_ring->buffer_info[i];
1986
1987                 cleaned = true;
1988                 cleaned_count++;
1989
1990                 dma_unmap_single(&pdev->dev,
1991                                  buffer_info->dma,
1992                                  buffer_info->length,
1993                                  DMA_FROM_DEVICE);
1994                 buffer_info->dma = 0;
1995
1996                 length = le16_to_cpu(rx_desc->length);
1997                 rx_desc->length = 0;
1998
1999                 if (unlikely(!(status & IXGB_RX_DESC_STATUS_EOP))) {
2000
2001                         /* All receives must fit into a single buffer */
2002
2003                         pr_debug("Receive packet consumed multiple buffers length<%x>\n",
2004                                  length);
2005
2006                         dev_kfree_skb_irq(skb);
2007                         goto rxdesc_done;
2008                 }
2009
2010                 if (unlikely(rx_desc->errors &
2011                     (IXGB_RX_DESC_ERRORS_CE | IXGB_RX_DESC_ERRORS_SE |
2012                      IXGB_RX_DESC_ERRORS_P | IXGB_RX_DESC_ERRORS_RXE))) {
2013                         dev_kfree_skb_irq(skb);
2014                         goto rxdesc_done;
2015                 }
2016
2017                 ixgb_check_copybreak(&adapter->napi, buffer_info, length, &skb);
2018
2019                 /* Good Receive */
2020                 skb_put(skb, length);
2021
2022                 /* Receive Checksum Offload */
2023                 ixgb_rx_checksum(adapter, rx_desc, skb);
2024
2025                 skb->protocol = eth_type_trans(skb, netdev);
2026                 if (status & IXGB_RX_DESC_STATUS_VP)
2027                         __vlan_hwaccel_put_tag(skb, htons(ETH_P_8021Q),
2028                                        le16_to_cpu(rx_desc->special));
2029
2030                 netif_receive_skb(skb);
2031
2032 rxdesc_done:
2033                 /* clean up descriptor, might be written over by hw */
2034                 rx_desc->status = 0;
2035
2036                 /* return some buffers to hardware, one at a time is too slow */
2037                 if (unlikely(cleaned_count >= IXGB_RX_BUFFER_WRITE)) {
2038                         ixgb_alloc_rx_buffers(adapter, cleaned_count);
2039                         cleaned_count = 0;
2040                 }
2041
2042                 /* use prefetched values */
2043                 rx_desc = next_rxd;
2044                 buffer_info = next_buffer;
2045         }
2046
2047         rx_ring->next_to_clean = i;
2048
2049         cleaned_count = IXGB_DESC_UNUSED(rx_ring);
2050         if (cleaned_count)
2051                 ixgb_alloc_rx_buffers(adapter, cleaned_count);
2052
2053         return cleaned;
2054 }
2055
2056 /**
2057  * ixgb_alloc_rx_buffers - Replace used receive buffers
2058  * @adapter: address of board private structure
2059  **/
2060
2061 static void
2062 ixgb_alloc_rx_buffers(struct ixgb_adapter *adapter, int cleaned_count)
2063 {
2064         struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
2065         struct net_device *netdev = adapter->netdev;
2066         struct pci_dev *pdev = adapter->pdev;
2067         struct ixgb_rx_desc *rx_desc;
2068         struct ixgb_buffer *buffer_info;
2069         struct sk_buff *skb;
2070         unsigned int i;
2071         long cleancount;
2072
2073         i = rx_ring->next_to_use;
2074         buffer_info = &rx_ring->buffer_info[i];
2075         cleancount = IXGB_DESC_UNUSED(rx_ring);
2076
2077
2078         /* leave three descriptors unused */
2079         while (--cleancount > 2 && cleaned_count--) {
2080                 /* recycle! its good for you */
2081                 skb = buffer_info->skb;
2082                 if (skb) {
2083                         skb_trim(skb, 0);
2084                         goto map_skb;
2085                 }
2086
2087                 skb = netdev_alloc_skb_ip_align(netdev, adapter->rx_buffer_len);
2088                 if (unlikely(!skb)) {
2089                         /* Better luck next round */
2090                         adapter->alloc_rx_buff_failed++;
2091                         break;
2092                 }
2093
2094                 buffer_info->skb = skb;
2095                 buffer_info->length = adapter->rx_buffer_len;
2096 map_skb:
2097                 buffer_info->dma = dma_map_single(&pdev->dev,
2098                                                   skb->data,
2099                                                   adapter->rx_buffer_len,
2100                                                   DMA_FROM_DEVICE);
2101                 if (dma_mapping_error(&pdev->dev, buffer_info->dma)) {
2102                         adapter->alloc_rx_buff_failed++;
2103                         break;
2104                 }
2105
2106                 rx_desc = IXGB_RX_DESC(*rx_ring, i);
2107                 rx_desc->buff_addr = cpu_to_le64(buffer_info->dma);
2108                 /* guarantee DD bit not set now before h/w gets descriptor
2109                  * this is the rest of the workaround for h/w double
2110                  * writeback. */
2111                 rx_desc->status = 0;
2112
2113
2114                 if (++i == rx_ring->count)
2115                         i = 0;
2116                 buffer_info = &rx_ring->buffer_info[i];
2117         }
2118
2119         if (likely(rx_ring->next_to_use != i)) {
2120                 rx_ring->next_to_use = i;
2121                 if (unlikely(i-- == 0))
2122                         i = (rx_ring->count - 1);
2123
2124                 /* Force memory writes to complete before letting h/w
2125                  * know there are new descriptors to fetch.  (Only
2126                  * applicable for weak-ordered memory model archs, such
2127                  * as IA-64). */
2128                 wmb();
2129                 IXGB_WRITE_REG(&adapter->hw, RDT, i);
2130         }
2131 }
2132
2133 static void
2134 ixgb_vlan_strip_enable(struct ixgb_adapter *adapter)
2135 {
2136         u32 ctrl;
2137
2138         /* enable VLAN tag insert/strip */
2139         ctrl = IXGB_READ_REG(&adapter->hw, CTRL0);
2140         ctrl |= IXGB_CTRL0_VME;
2141         IXGB_WRITE_REG(&adapter->hw, CTRL0, ctrl);
2142 }
2143
2144 static void
2145 ixgb_vlan_strip_disable(struct ixgb_adapter *adapter)
2146 {
2147         u32 ctrl;
2148
2149         /* disable VLAN tag insert/strip */
2150         ctrl = IXGB_READ_REG(&adapter->hw, CTRL0);
2151         ctrl &= ~IXGB_CTRL0_VME;
2152         IXGB_WRITE_REG(&adapter->hw, CTRL0, ctrl);
2153 }
2154
2155 static int
2156 ixgb_vlan_rx_add_vid(struct net_device *netdev, __be16 proto, u16 vid)
2157 {
2158         struct ixgb_adapter *adapter = netdev_priv(netdev);
2159         u32 vfta, index;
2160
2161         /* add VID to filter table */
2162
2163         index = (vid >> 5) & 0x7F;
2164         vfta = IXGB_READ_REG_ARRAY(&adapter->hw, VFTA, index);
2165         vfta |= (1 << (vid & 0x1F));
2166         ixgb_write_vfta(&adapter->hw, index, vfta);
2167         set_bit(vid, adapter->active_vlans);
2168
2169         return 0;
2170 }
2171
2172 static int
2173 ixgb_vlan_rx_kill_vid(struct net_device *netdev, __be16 proto, u16 vid)
2174 {
2175         struct ixgb_adapter *adapter = netdev_priv(netdev);
2176         u32 vfta, index;
2177
2178         /* remove VID from filter table */
2179
2180         index = (vid >> 5) & 0x7F;
2181         vfta = IXGB_READ_REG_ARRAY(&adapter->hw, VFTA, index);
2182         vfta &= ~(1 << (vid & 0x1F));
2183         ixgb_write_vfta(&adapter->hw, index, vfta);
2184         clear_bit(vid, adapter->active_vlans);
2185
2186         return 0;
2187 }
2188
2189 static void
2190 ixgb_restore_vlan(struct ixgb_adapter *adapter)
2191 {
2192         u16 vid;
2193
2194         for_each_set_bit(vid, adapter->active_vlans, VLAN_N_VID)
2195                 ixgb_vlan_rx_add_vid(adapter->netdev, htons(ETH_P_8021Q), vid);
2196 }
2197
2198 #ifdef CONFIG_NET_POLL_CONTROLLER
2199 /*
2200  * Polling 'interrupt' - used by things like netconsole to send skbs
2201  * without having to re-enable interrupts. It's not called while
2202  * the interrupt routine is executing.
2203  */
2204
2205 static void ixgb_netpoll(struct net_device *dev)
2206 {
2207         struct ixgb_adapter *adapter = netdev_priv(dev);
2208
2209         disable_irq(adapter->pdev->irq);
2210         ixgb_intr(adapter->pdev->irq, dev);
2211         enable_irq(adapter->pdev->irq);
2212 }
2213 #endif
2214
2215 /**
2216  * ixgb_io_error_detected - called when PCI error is detected
2217  * @pdev:    pointer to pci device with error
2218  * @state:   pci channel state after error
2219  *
2220  * This callback is called by the PCI subsystem whenever
2221  * a PCI bus error is detected.
2222  */
2223 static pci_ers_result_t ixgb_io_error_detected(struct pci_dev *pdev,
2224                                                enum pci_channel_state state)
2225 {
2226         struct net_device *netdev = pci_get_drvdata(pdev);
2227         struct ixgb_adapter *adapter = netdev_priv(netdev);
2228
2229         netif_device_detach(netdev);
2230
2231         if (state == pci_channel_io_perm_failure)
2232                 return PCI_ERS_RESULT_DISCONNECT;
2233
2234         if (netif_running(netdev))
2235                 ixgb_down(adapter, true);
2236
2237         pci_disable_device(pdev);
2238
2239         /* Request a slot reset. */
2240         return PCI_ERS_RESULT_NEED_RESET;
2241 }
2242
2243 /**
2244  * ixgb_io_slot_reset - called after the pci bus has been reset.
2245  * @pdev    pointer to pci device with error
2246  *
2247  * This callback is called after the PCI bus has been reset.
2248  * Basically, this tries to restart the card from scratch.
2249  * This is a shortened version of the device probe/discovery code,
2250  * it resembles the first-half of the ixgb_probe() routine.
2251  */
2252 static pci_ers_result_t ixgb_io_slot_reset(struct pci_dev *pdev)
2253 {
2254         struct net_device *netdev = pci_get_drvdata(pdev);
2255         struct ixgb_adapter *adapter = netdev_priv(netdev);
2256
2257         if (pci_enable_device(pdev)) {
2258                 netif_err(adapter, probe, adapter->netdev,
2259                           "Cannot re-enable PCI device after reset\n");
2260                 return PCI_ERS_RESULT_DISCONNECT;
2261         }
2262
2263         /* Perform card reset only on one instance of the card */
2264         if (0 != PCI_FUNC (pdev->devfn))
2265                 return PCI_ERS_RESULT_RECOVERED;
2266
2267         pci_set_master(pdev);
2268
2269         netif_carrier_off(netdev);
2270         netif_stop_queue(netdev);
2271         ixgb_reset(adapter);
2272
2273         /* Make sure the EEPROM is good */
2274         if (!ixgb_validate_eeprom_checksum(&adapter->hw)) {
2275                 netif_err(adapter, probe, adapter->netdev,
2276                           "After reset, the EEPROM checksum is not valid\n");
2277                 return PCI_ERS_RESULT_DISCONNECT;
2278         }
2279         ixgb_get_ee_mac_addr(&adapter->hw, netdev->dev_addr);
2280         memcpy(netdev->perm_addr, netdev->dev_addr, netdev->addr_len);
2281
2282         if (!is_valid_ether_addr(netdev->perm_addr)) {
2283                 netif_err(adapter, probe, adapter->netdev,
2284                           "After reset, invalid MAC address\n");
2285                 return PCI_ERS_RESULT_DISCONNECT;
2286         }
2287
2288         return PCI_ERS_RESULT_RECOVERED;
2289 }
2290
2291 /**
2292  * ixgb_io_resume - called when its OK to resume normal operations
2293  * @pdev    pointer to pci device with error
2294  *
2295  * The error recovery driver tells us that its OK to resume
2296  * normal operation. Implementation resembles the second-half
2297  * of the ixgb_probe() routine.
2298  */
2299 static void ixgb_io_resume(struct pci_dev *pdev)
2300 {
2301         struct net_device *netdev = pci_get_drvdata(pdev);
2302         struct ixgb_adapter *adapter = netdev_priv(netdev);
2303
2304         pci_set_master(pdev);
2305
2306         if (netif_running(netdev)) {
2307                 if (ixgb_up(adapter)) {
2308                         pr_err("can't bring device back up after reset\n");
2309                         return;
2310                 }
2311         }
2312
2313         netif_device_attach(netdev);
2314         mod_timer(&adapter->watchdog_timer, jiffies);
2315 }
2316
2317 /* ixgb_main.c */