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, unsigned int txqueue);
  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 static pci_ers_result_t ixgb_io_error_detected (struct pci_dev *pdev,
  85                              enum pci_channel_state state);
  86 static pci_ers_result_t ixgb_io_slot_reset (struct pci_dev *pdev);
  87 static void ixgb_io_resume (struct pci_dev *pdev);
  88
  89 static const struct pci_error_handlers ixgb_err_handler = {
  90         .error_detected = ixgb_io_error_detected,
  91         .slot_reset = ixgb_io_slot_reset,
  92         .resume = ixgb_io_resume,
  93 };
  94
  95 static struct pci_driver ixgb_driver = {
  96         .name     = ixgb_driver_name,
  97         .id_table = ixgb_pci_tbl,
  98         .probe    = ixgb_probe,
  99         .remove   = ixgb_remove,
 100         .err_handler = &ixgb_err_handler
 101 };
 102
 103 MODULE_AUTHOR("Intel Corporation, <linux.nics@intel.com>");
 104 MODULE_DESCRIPTION("Intel(R) PRO/10GbE Network Driver");
 105 MODULE_LICENSE("GPL v2");
 106 MODULE_VERSION(DRV_VERSION);
 107
 108 #define DEFAULT_MSG_ENABLE (NETIF_MSG_DRV|NETIF_MSG_PROBE|NETIF_MSG_LINK)
 109 static int debug = -1;
 110 module_param(debug, int, 0);
 111 MODULE_PARM_DESC(debug, "Debug level (0=none,...,16=all)");
 112
 113 /**
 114  * ixgb_init_module - Driver Registration Routine
 115  *
 116  * ixgb_init_module is the first routine called when the driver is
 117  * loaded. All it does is register with the PCI subsystem.
 118  **/
 119
 120 static int __init
 121 ixgb_init_module(void)
 122 {
 123         pr_info("%s - version %s\n", ixgb_driver_string, ixgb_driver_version);
 124         pr_info("%s\n", ixgb_copyright);
 125
 126         return pci_register_driver(&ixgb_driver);
 127 }
 128
 129 module_init(ixgb_init_module);
 130
 131 /**
 132  * ixgb_exit_module - Driver Exit Cleanup Routine
 133  *
 134  * ixgb_exit_module is called just before the driver is removed
 135  * from memory.
 136  **/
 137
 138 static void __exit
 139 ixgb_exit_module(void)
 140 {
 141         pci_unregister_driver(&ixgb_driver);
 142 }
 143
 144 module_exit(ixgb_exit_module);
 145
 146 /**
 147  * ixgb_irq_disable - Mask off interrupt generation on the NIC
 148  * @adapter: board private structure
 149  **/
 150
 151 static void
 152 ixgb_irq_disable(struct ixgb_adapter *adapter)
 153 {
 154         IXGB_WRITE_REG(&adapter->hw, IMC, ~0);
 155         IXGB_WRITE_FLUSH(&adapter->hw);
 156         synchronize_irq(adapter->pdev->irq);
 157 }
 158
 159 /**
 160  * ixgb_irq_enable - Enable default interrupt generation settings
 161  * @adapter: board private structure
 162  **/
 163
 164 static void
 165 ixgb_irq_enable(struct ixgb_adapter *adapter)
 166 {
 167         u32 val = IXGB_INT_RXT0 | IXGB_INT_RXDMT0 |
 168                   IXGB_INT_TXDW | IXGB_INT_LSC;
 169         if (adapter->hw.subsystem_vendor_id == PCI_VENDOR_ID_SUN)
 170                 val |= IXGB_INT_GPI0;
 171         IXGB_WRITE_REG(&adapter->hw, IMS, val);
 172         IXGB_WRITE_FLUSH(&adapter->hw);
 173 }
 174
 175 int
 176 ixgb_up(struct ixgb_adapter *adapter)
 177 {
 178         struct net_device *netdev = adapter->netdev;
 179         int err, irq_flags = IRQF_SHARED;
 180         int max_frame = netdev->mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;
 181         struct ixgb_hw *hw = &adapter->hw;
 182
 183         /* hardware has been reset, we need to reload some things */
 184
 185         ixgb_rar_set(hw, netdev->dev_addr, 0);
 186         ixgb_set_multi(netdev);
 187
 188         ixgb_restore_vlan(adapter);
 189
 190         ixgb_configure_tx(adapter);
 191         ixgb_setup_rctl(adapter);
 192         ixgb_configure_rx(adapter);
 193         ixgb_alloc_rx_buffers(adapter, IXGB_DESC_UNUSED(&adapter->rx_ring));
 194
 195         /* disable interrupts and get the hardware into a known state */
 196         IXGB_WRITE_REG(&adapter->hw, IMC, 0xffffffff);
 197
 198         /* only enable MSI if bus is in PCI-X mode */
 199         if (IXGB_READ_REG(&adapter->hw, STATUS) & IXGB_STATUS_PCIX_MODE) {
 200                 err = pci_enable_msi(adapter->pdev);
 201                 if (!err) {
 202                         adapter->have_msi = true;
 203                         irq_flags = 0;
 204                 }
 205                 /* proceed to try to request regular interrupt */
 206         }
 207
 208         err = request_irq(adapter->pdev->irq, ixgb_intr, irq_flags,
 209                           netdev->name, netdev);
 210         if (err) {
 211                 if (adapter->have_msi)
 212                         pci_disable_msi(adapter->pdev);
 213                 netif_err(adapter, probe, adapter->netdev,
 214                           "Unable to allocate interrupt Error: %d\n", err);
 215                 return err;
 216         }
 217
 218         if ((hw->max_frame_size != max_frame) ||
 219                 (hw->max_frame_size !=
 220                 (IXGB_READ_REG(hw, MFS) >> IXGB_MFS_SHIFT))) {
 221
 222                 hw->max_frame_size = max_frame;
 223
 224                 IXGB_WRITE_REG(hw, MFS, hw->max_frame_size << IXGB_MFS_SHIFT);
 225
 226                 if (hw->max_frame_size >
 227                    IXGB_MAX_ENET_FRAME_SIZE_WITHOUT_FCS + ENET_FCS_LENGTH) {
 228                         u32 ctrl0 = IXGB_READ_REG(hw, CTRL0);
 229
 230                         if (!(ctrl0 & IXGB_CTRL0_JFE)) {
 231                                 ctrl0 |= IXGB_CTRL0_JFE;
 232                                 IXGB_WRITE_REG(hw, CTRL0, ctrl0);
 233                         }
 234                 }
 235         }
 236
 237         clear_bit(__IXGB_DOWN, &adapter->flags);
 238
 239         napi_enable(&adapter->napi);
 240         ixgb_irq_enable(adapter);
 241
 242         netif_wake_queue(netdev);
 243
 244         mod_timer(&adapter->watchdog_timer, jiffies);
 245
 246         return 0;
 247 }
 248
 249 void
 250 ixgb_down(struct ixgb_adapter *adapter, bool kill_watchdog)
 251 {
 252         struct net_device *netdev = adapter->netdev;
 253
 254         /* prevent the interrupt handler from restarting watchdog */
 255         set_bit(__IXGB_DOWN, &adapter->flags);
 256
 257         netif_carrier_off(netdev);
 258
 259         napi_disable(&adapter->napi);
 260         /* waiting for NAPI to complete can re-enable interrupts */
 261         ixgb_irq_disable(adapter);
 262         free_irq(adapter->pdev->irq, netdev);
 263
 264         if (adapter->have_msi)
 265                 pci_disable_msi(adapter->pdev);
 266
 267         if (kill_watchdog)
 268                 del_timer_sync(&adapter->watchdog_timer);
 269
 270         adapter->link_speed = 0;
 271         adapter->link_duplex = 0;
 272         netif_stop_queue(netdev);
 273
 274         ixgb_reset(adapter);
 275         ixgb_clean_tx_ring(adapter);
 276         ixgb_clean_rx_ring(adapter);
 277 }
 278
 279 void
 280 ixgb_reset(struct ixgb_adapter *adapter)
 281 {
 282         struct ixgb_hw *hw = &adapter->hw;
 283
 284         ixgb_adapter_stop(hw);
 285         if (!ixgb_init_hw(hw))
 286                 netif_err(adapter, probe, adapter->netdev, "ixgb_init_hw failed\n");
 287
 288         /* restore frame size information */
 289         IXGB_WRITE_REG(hw, MFS, hw->max_frame_size << IXGB_MFS_SHIFT);
 290         if (hw->max_frame_size >
 291             IXGB_MAX_ENET_FRAME_SIZE_WITHOUT_FCS + ENET_FCS_LENGTH) {
 292                 u32 ctrl0 = IXGB_READ_REG(hw, CTRL0);
 293                 if (!(ctrl0 & IXGB_CTRL0_JFE)) {
 294                         ctrl0 |= IXGB_CTRL0_JFE;
 295                         IXGB_WRITE_REG(hw, CTRL0, ctrl0);
 296                 }
 297         }
 298 }
 299
 300 static netdev_features_t
 301 ixgb_fix_features(struct net_device *netdev, netdev_features_t features)
 302 {
 303         /*
 304          * Tx VLAN insertion does not work per HW design when Rx stripping is
 305          * disabled.
 306          */
 307         if (!(features & NETIF_F_HW_VLAN_CTAG_RX))
 308                 features &= ~NETIF_F_HW_VLAN_CTAG_TX;
 309
 310         return features;
 311 }
 312
 313 static int
 314 ixgb_set_features(struct net_device *netdev, netdev_features_t features)
 315 {
 316         struct ixgb_adapter *adapter = netdev_priv(netdev);
 317         netdev_features_t changed = features ^ netdev->features;
 318
 319         if (!(changed & (NETIF_F_RXCSUM|NETIF_F_HW_VLAN_CTAG_RX)))
 320                 return 0;
 321
 322         adapter->rx_csum = !!(features & NETIF_F_RXCSUM);
 323
 324         if (netif_running(netdev)) {
 325                 ixgb_down(adapter, true);
 326                 ixgb_up(adapter);
 327                 ixgb_set_speed_duplex(netdev);
 328         } else
 329                 ixgb_reset(adapter);
 330
 331         return 0;
 332 }
 333
 334
 335 static const struct net_device_ops ixgb_netdev_ops = {
 336         .ndo_open               = ixgb_open,
 337         .ndo_stop               = ixgb_close,
 338         .ndo_start_xmit         = ixgb_xmit_frame,
 339         .ndo_set_rx_mode        = ixgb_set_multi,
 340         .ndo_validate_addr      = eth_validate_addr,
 341         .ndo_set_mac_address    = ixgb_set_mac,
 342         .ndo_change_mtu         = ixgb_change_mtu,
 343         .ndo_tx_timeout         = ixgb_tx_timeout,
 344         .ndo_vlan_rx_add_vid    = ixgb_vlan_rx_add_vid,
 345         .ndo_vlan_rx_kill_vid   = ixgb_vlan_rx_kill_vid,
 346         .ndo_fix_features       = ixgb_fix_features,
 347         .ndo_set_features       = ixgb_set_features,
 348 };
 349
 350 /**
 351  * ixgb_probe - Device Initialization Routine
 352  * @pdev: PCI device information struct
 353  * @ent: entry in ixgb_pci_tbl
 354  *
 355  * Returns 0 on success, negative on failure
 356  *
 357  * ixgb_probe initializes an adapter identified by a pci_dev structure.
 358  * The OS initialization, configuring of the adapter private structure,
 359  * and a hardware reset occur.
 360  **/
 361
 362 static int
 363 ixgb_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
 364 {
 365         struct net_device *netdev = NULL;
 366         struct ixgb_adapter *adapter;
 367         static int cards_found = 0;
 368         int pci_using_dac;
 369         int i;
 370         int err;
 371
 372         err = pci_enable_device(pdev);
 373         if (err)
 374                 return err;
 375
 376         pci_using_dac = 0;
 377         err = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(64));
 378         if (!err) {
 379                 pci_using_dac = 1;
 380         } else {
 381                 err = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32));
 382                 if (err) {
 383                         pr_err("No usable DMA configuration, aborting\n");
 384                         goto err_dma_mask;
 385                 }
 386         }
 387
 388         err = pci_request_regions(pdev, ixgb_driver_name);
 389         if (err)
 390                 goto err_request_regions;
 391
 392         pci_set_master(pdev);
 393
 394         netdev = alloc_etherdev(sizeof(struct ixgb_adapter));
 395         if (!netdev) {
 396                 err = -ENOMEM;
 397                 goto err_alloc_etherdev;
 398         }
 399
 400         SET_NETDEV_DEV(netdev, &pdev->dev);
 401
 402         pci_set_drvdata(pdev, netdev);
 403         adapter = netdev_priv(netdev);
 404         adapter->netdev = netdev;
 405         adapter->pdev = pdev;
 406         adapter->hw.back = adapter;
 407         adapter->msg_enable = netif_msg_init(debug, DEFAULT_MSG_ENABLE);
 408
 409         adapter->hw.hw_addr = pci_ioremap_bar(pdev, BAR_0);
 410         if (!adapter->hw.hw_addr) {
 411                 err = -EIO;
 412                 goto err_ioremap;
 413         }
 414
 415         for (i = BAR_1; i < PCI_STD_NUM_BARS; i++) {
 416                 if (pci_resource_len(pdev, i) == 0)
 417                         continue;
 418                 if (pci_resource_flags(pdev, i) & IORESOURCE_IO) {
 419                         adapter->hw.io_base = pci_resource_start(pdev, i);
 420                         break;
 421                 }
 422         }
 423
 424         netdev->netdev_ops = &ixgb_netdev_ops;
 425         ixgb_set_ethtool_ops(netdev);
 426         netdev->watchdog_timeo = 5 * HZ;
 427         netif_napi_add(netdev, &adapter->napi, ixgb_clean, 64);
 428
 429         strncpy(netdev->name, pci_name(pdev), sizeof(netdev->name) - 1);
 430
 431         adapter->bd_number = cards_found;
 432         adapter->link_speed = 0;
 433         adapter->link_duplex = 0;
 434
 435         /* setup the private structure */
 436
 437         err = ixgb_sw_init(adapter);
 438         if (err)
 439                 goto err_sw_init;
 440
 441         netdev->hw_features = NETIF_F_SG |
 442                            NETIF_F_TSO |
 443                            NETIF_F_HW_CSUM |
 444                            NETIF_F_HW_VLAN_CTAG_TX |
 445                            NETIF_F_HW_VLAN_CTAG_RX;
 446         netdev->features = netdev->hw_features |
 447                            NETIF_F_HW_VLAN_CTAG_FILTER;
 448         netdev->hw_features |= NETIF_F_RXCSUM;
 449
 450         if (pci_using_dac) {
 451                 netdev->features |= NETIF_F_HIGHDMA;
 452                 netdev->vlan_features |= NETIF_F_HIGHDMA;
 453         }
 454
 455         /* MTU range: 68 - 16114 */
 456         netdev->min_mtu = ETH_MIN_MTU;
 457         netdev->max_mtu = IXGB_MAX_JUMBO_FRAME_SIZE - ETH_HLEN;
 458
 459         /* make sure the EEPROM is good */
 460
 461         if (!ixgb_validate_eeprom_checksum(&adapter->hw)) {
 462                 netif_err(adapter, probe, adapter->netdev,
 463                           "The EEPROM Checksum Is Not Valid\n");
 464                 err = -EIO;
 465                 goto err_eeprom;
 466         }
 467
 468         ixgb_get_ee_mac_addr(&adapter->hw, netdev->dev_addr);
 469
 470         if (!is_valid_ether_addr(netdev->dev_addr)) {
 471                 netif_err(adapter, probe, adapter->netdev, "Invalid MAC Address\n");
 472                 err = -EIO;
 473                 goto err_eeprom;
 474         }
 475
 476         adapter->part_num = ixgb_get_ee_pba_number(&adapter->hw);
 477
 478         timer_setup(&adapter->watchdog_timer, ixgb_watchdog, 0);
 479
 480         INIT_WORK(&adapter->tx_timeout_task, ixgb_tx_timeout_task);
 481
 482         strcpy(netdev->name, "eth%d");
 483         err = register_netdev(netdev);
 484         if (err)
 485                 goto err_register;
 486
 487         /* carrier off reporting is important to ethtool even BEFORE open */
 488         netif_carrier_off(netdev);
 489
 490         netif_info(adapter, probe, adapter->netdev,
 491                    "Intel(R) PRO/10GbE Network Connection\n");
 492         ixgb_check_options(adapter);
 493         /* reset the hardware with the new settings */
 494
 495         ixgb_reset(adapter);
 496
 497         cards_found++;
 498         return 0;
 499
 500 err_register:
 501 err_sw_init:
 502 err_eeprom:
 503         iounmap(adapter->hw.hw_addr);
 504 err_ioremap:
 505         free_netdev(netdev);
 506 err_alloc_etherdev:
 507         pci_release_regions(pdev);
 508 err_request_regions:
 509 err_dma_mask:
 510         pci_disable_device(pdev);
 511         return err;
 512 }
 513
 514 /**
 515  * ixgb_remove - Device Removal Routine
 516  * @pdev: PCI device information struct
 517  *
 518  * ixgb_remove is called by the PCI subsystem to alert the driver
 519  * that it should release a PCI device.  The could be caused by a
 520  * Hot-Plug event, or because the driver is going to be removed from
 521  * memory.
 522  **/
 523
 524 static void
 525 ixgb_remove(struct pci_dev *pdev)
 526 {
 527         struct net_device *netdev = pci_get_drvdata(pdev);
 528         struct ixgb_adapter *adapter = netdev_priv(netdev);
 529
 530         cancel_work_sync(&adapter->tx_timeout_task);
 531
 532         unregister_netdev(netdev);
 533
 534         iounmap(adapter->hw.hw_addr);
 535         pci_release_regions(pdev);
 536
 537         free_netdev(netdev);
 538         pci_disable_device(pdev);
 539 }
 540
 541 /**
 542  * ixgb_sw_init - Initialize general software structures (struct ixgb_adapter)
 543  * @adapter: board private structure to initialize
 544  *
 545  * ixgb_sw_init initializes the Adapter private data structure.
 546  * Fields are initialized based on PCI device information and
 547  * OS network device settings (MTU size).
 548  **/
 549
 550 static int
 551 ixgb_sw_init(struct ixgb_adapter *adapter)
 552 {
 553         struct ixgb_hw *hw = &adapter->hw;
 554         struct net_device *netdev = adapter->netdev;
 555         struct pci_dev *pdev = adapter->pdev;
 556
 557         /* PCI config space info */
 558
 559         hw->vendor_id = pdev->vendor;
 560         hw->device_id = pdev->device;
 561         hw->subsystem_vendor_id = pdev->subsystem_vendor;
 562         hw->subsystem_id = pdev->subsystem_device;
 563
 564         hw->max_frame_size = netdev->mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;
 565         adapter->rx_buffer_len = hw->max_frame_size + 8; /* + 8 for errata */
 566
 567         if ((hw->device_id == IXGB_DEVICE_ID_82597EX) ||
 568             (hw->device_id == IXGB_DEVICE_ID_82597EX_CX4) ||
 569             (hw->device_id == IXGB_DEVICE_ID_82597EX_LR) ||
 570             (hw->device_id == IXGB_DEVICE_ID_82597EX_SR))
 571                 hw->mac_type = ixgb_82597;
 572         else {
 573                 /* should never have loaded on this device */
 574                 netif_err(adapter, probe, adapter->netdev, "unsupported device id\n");
 575         }
 576
 577         /* enable flow control to be programmed */
 578         hw->fc.send_xon = 1;
 579
 580         set_bit(__IXGB_DOWN, &adapter->flags);
 581         return 0;
 582 }
 583
 584 /**
 585  * ixgb_open - Called when a network interface is made active
 586  * @netdev: network interface device structure
 587  *
 588  * Returns 0 on success, negative value on failure
 589  *
 590  * The open entry point is called when a network interface is made
 591  * active by the system (IFF_UP).  At this point all resources needed
 592  * for transmit and receive operations are allocated, the interrupt
 593  * handler is registered with the OS, the watchdog timer is started,
 594  * and the stack is notified that the interface is ready.
 595  **/
 596
 597 static int
 598 ixgb_open(struct net_device *netdev)
 599 {
 600         struct ixgb_adapter *adapter = netdev_priv(netdev);
 601         int err;
 602
 603         /* allocate transmit descriptors */
 604         err = ixgb_setup_tx_resources(adapter);
 605         if (err)
 606                 goto err_setup_tx;
 607
 608         netif_carrier_off(netdev);
 609
 610         /* allocate receive descriptors */
 611
 612         err = ixgb_setup_rx_resources(adapter);
 613         if (err)
 614                 goto err_setup_rx;
 615
 616         err = ixgb_up(adapter);
 617         if (err)
 618                 goto err_up;
 619
 620         netif_start_queue(netdev);
 621
 622         return 0;
 623
 624 err_up:
 625         ixgb_free_rx_resources(adapter);
 626 err_setup_rx:
 627         ixgb_free_tx_resources(adapter);
 628 err_setup_tx:
 629         ixgb_reset(adapter);
 630
 631         return err;
 632 }
 633
 634 /**
 635  * ixgb_close - Disables a network interface
 636  * @netdev: network interface device structure
 637  *
 638  * Returns 0, this is not allowed to fail
 639  *
 640  * The close entry point is called when an interface is de-activated
 641  * by the OS.  The hardware is still under the drivers control, but
 642  * needs to be disabled.  A global MAC reset is issued to stop the
 643  * hardware, and all transmit and receive resources are freed.
 644  **/
 645
 646 static int
 647 ixgb_close(struct net_device *netdev)
 648 {
 649         struct ixgb_adapter *adapter = netdev_priv(netdev);
 650
 651         ixgb_down(adapter, true);
 652
 653         ixgb_free_tx_resources(adapter);
 654         ixgb_free_rx_resources(adapter);
 655
 656         return 0;
 657 }
 658
 659 /**
 660  * ixgb_setup_tx_resources - allocate Tx resources (Descriptors)
 661  * @adapter: board private structure
 662  *
 663  * Return 0 on success, negative on failure
 664  **/
 665
 666 int
 667 ixgb_setup_tx_resources(struct ixgb_adapter *adapter)
 668 {
 669         struct ixgb_desc_ring *txdr = &adapter->tx_ring;
 670         struct pci_dev *pdev = adapter->pdev;
 671         int size;
 672
 673         size = sizeof(struct ixgb_buffer) * txdr->count;
 674         txdr->buffer_info = vzalloc(size);
 675         if (!txdr->buffer_info)
 676                 return -ENOMEM;
 677
 678         /* round up to nearest 4K */
 679
 680         txdr->size = txdr->count * sizeof(struct ixgb_tx_desc);
 681         txdr->size = ALIGN(txdr->size, 4096);
 682
 683         txdr->desc = dma_alloc_coherent(&pdev->dev, txdr->size, &txdr->dma,
 684                                         GFP_KERNEL);
 685         if (!txdr->desc) {
 686                 vfree(txdr->buffer_info);
 687                 return -ENOMEM;
 688         }
 689
 690         txdr->next_to_use = 0;
 691         txdr->next_to_clean = 0;
 692
 693         return 0;
 694 }
 695
 696 /**
 697  * ixgb_configure_tx - Configure 82597 Transmit Unit after Reset.
 698  * @adapter: board private structure
 699  *
 700  * Configure the Tx unit of the MAC after a reset.
 701  **/
 702
 703 static void
 704 ixgb_configure_tx(struct ixgb_adapter *adapter)
 705 {
 706         u64 tdba = adapter->tx_ring.dma;
 707         u32 tdlen = adapter->tx_ring.count * sizeof(struct ixgb_tx_desc);
 708         u32 tctl;
 709         struct ixgb_hw *hw = &adapter->hw;
 710
 711         /* Setup the Base and Length of the Tx Descriptor Ring
 712          * tx_ring.dma can be either a 32 or 64 bit value
 713          */
 714
 715         IXGB_WRITE_REG(hw, TDBAL, (tdba & 0x00000000ffffffffULL));
 716         IXGB_WRITE_REG(hw, TDBAH, (tdba >> 32));
 717
 718         IXGB_WRITE_REG(hw, TDLEN, tdlen);
 719
 720         /* Setup the HW Tx Head and Tail descriptor pointers */
 721
 722         IXGB_WRITE_REG(hw, TDH, 0);
 723         IXGB_WRITE_REG(hw, TDT, 0);
 724
 725         /* don't set up txdctl, it induces performance problems if configured
 726          * incorrectly */
 727         /* Set the Tx Interrupt Delay register */
 728
 729         IXGB_WRITE_REG(hw, TIDV, adapter->tx_int_delay);
 730
 731         /* Program the Transmit Control Register */
 732
 733         tctl = IXGB_TCTL_TCE | IXGB_TCTL_TXEN | IXGB_TCTL_TPDE;
 734         IXGB_WRITE_REG(hw, TCTL, tctl);
 735
 736         /* Setup Transmit Descriptor Settings for this adapter */
 737         adapter->tx_cmd_type =
 738                 IXGB_TX_DESC_TYPE |
 739                 (adapter->tx_int_delay_enable ? IXGB_TX_DESC_CMD_IDE : 0);
 740 }
 741
 742 /**
 743  * ixgb_setup_rx_resources - allocate Rx resources (Descriptors)
 744  * @adapter: board private structure
 745  *
 746  * Returns 0 on success, negative on failure
 747  **/
 748
 749 int
 750 ixgb_setup_rx_resources(struct ixgb_adapter *adapter)
 751 {
 752         struct ixgb_desc_ring *rxdr = &adapter->rx_ring;
 753         struct pci_dev *pdev = adapter->pdev;
 754         int size;
 755
 756         size = sizeof(struct ixgb_buffer) * rxdr->count;
 757         rxdr->buffer_info = vzalloc(size);
 758         if (!rxdr->buffer_info)
 759                 return -ENOMEM;
 760
 761         /* Round up to nearest 4K */
 762
 763         rxdr->size = rxdr->count * sizeof(struct ixgb_rx_desc);
 764         rxdr->size = ALIGN(rxdr->size, 4096);
 765
 766         rxdr->desc = dma_alloc_coherent(&pdev->dev, rxdr->size, &rxdr->dma,
 767                                         GFP_KERNEL);
 768
 769         if (!rxdr->desc) {
 770                 vfree(rxdr->buffer_info);
 771                 return -ENOMEM;
 772         }
 773
 774         rxdr->next_to_clean = 0;
 775         rxdr->next_to_use = 0;
 776
 777         return 0;
 778 }
 779
 780 /**
 781  * ixgb_setup_rctl - configure the receive control register
 782  * @adapter: Board private structure
 783  **/
 784
 785 static void
 786 ixgb_setup_rctl(struct ixgb_adapter *adapter)
 787 {
 788         u32 rctl;
 789
 790         rctl = IXGB_READ_REG(&adapter->hw, RCTL);
 791
 792         rctl &= ~(3 << IXGB_RCTL_MO_SHIFT);
 793
 794         rctl |=
 795                 IXGB_RCTL_BAM | IXGB_RCTL_RDMTS_1_2 |
 796                 IXGB_RCTL_RXEN | IXGB_RCTL_CFF |
 797                 (adapter->hw.mc_filter_type << IXGB_RCTL_MO_SHIFT);
 798
 799         rctl |= IXGB_RCTL_SECRC;
 800
 801         if (adapter->rx_buffer_len <= IXGB_RXBUFFER_2048)
 802                 rctl |= IXGB_RCTL_BSIZE_2048;
 803         else if (adapter->rx_buffer_len <= IXGB_RXBUFFER_4096)
 804                 rctl |= IXGB_RCTL_BSIZE_4096;
 805         else if (adapter->rx_buffer_len <= IXGB_RXBUFFER_8192)
 806                 rctl |= IXGB_RCTL_BSIZE_8192;
 807         else if (adapter->rx_buffer_len <= IXGB_RXBUFFER_16384)
 808                 rctl |= IXGB_RCTL_BSIZE_16384;
 809
 810         IXGB_WRITE_REG(&adapter->hw, RCTL, rctl);
 811 }
 812
 813 /**
 814  * ixgb_configure_rx - Configure 82597 Receive Unit after Reset.
 815  * @adapter: board private structure
 816  *
 817  * Configure the Rx unit of the MAC after a reset.
 818  **/
 819
 820 static void
 821 ixgb_configure_rx(struct ixgb_adapter *adapter)
 822 {
 823         u64 rdba = adapter->rx_ring.dma;
 824         u32 rdlen = adapter->rx_ring.count * sizeof(struct ixgb_rx_desc);
 825         struct ixgb_hw *hw = &adapter->hw;
 826         u32 rctl;
 827         u32 rxcsum;
 828
 829         /* make sure receives are disabled while setting up the descriptors */
 830
 831         rctl = IXGB_READ_REG(hw, RCTL);
 832         IXGB_WRITE_REG(hw, RCTL, rctl & ~IXGB_RCTL_RXEN);
 833
 834         /* set the Receive Delay Timer Register */
 835
 836         IXGB_WRITE_REG(hw, RDTR, adapter->rx_int_delay);
 837
 838         /* Setup the Base and Length of the Rx Descriptor Ring */
 839
 840         IXGB_WRITE_REG(hw, RDBAL, (rdba & 0x00000000ffffffffULL));
 841         IXGB_WRITE_REG(hw, RDBAH, (rdba >> 32));
 842
 843         IXGB_WRITE_REG(hw, RDLEN, rdlen);
 844
 845         /* Setup the HW Rx Head and Tail Descriptor Pointers */
 846         IXGB_WRITE_REG(hw, RDH, 0);
 847         IXGB_WRITE_REG(hw, RDT, 0);
 848
 849         /* due to the hardware errata with RXDCTL, we are unable to use any of
 850          * the performance enhancing features of it without causing other
 851          * subtle bugs, some of the bugs could include receive length
 852          * corruption at high data rates (WTHRESH > 0) and/or receive
 853          * descriptor ring irregularites (particularly in hardware cache) */
 854         IXGB_WRITE_REG(hw, RXDCTL, 0);
 855
 856         /* Enable Receive Checksum Offload for TCP and UDP */
 857         if (adapter->rx_csum) {
 858                 rxcsum = IXGB_READ_REG(hw, RXCSUM);
 859                 rxcsum |= IXGB_RXCSUM_TUOFL;
 860                 IXGB_WRITE_REG(hw, RXCSUM, rxcsum);
 861         }
 862
 863         /* Enable Receives */
 864
 865         IXGB_WRITE_REG(hw, RCTL, rctl);
 866 }
 867
 868 /**
 869  * ixgb_free_tx_resources - Free Tx Resources
 870  * @adapter: board private structure
 871  *
 872  * Free all transmit software resources
 873  **/
 874
 875 void
 876 ixgb_free_tx_resources(struct ixgb_adapter *adapter)
 877 {
 878         struct pci_dev *pdev = adapter->pdev;
 879
 880         ixgb_clean_tx_ring(adapter);
 881
 882         vfree(adapter->tx_ring.buffer_info);
 883         adapter->tx_ring.buffer_info = NULL;
 884
 885         dma_free_coherent(&pdev->dev, adapter->tx_ring.size,
 886                           adapter->tx_ring.desc, adapter->tx_ring.dma);
 887
 888         adapter->tx_ring.desc = NULL;
 889 }
 890
 891 static void
 892 ixgb_unmap_and_free_tx_resource(struct ixgb_adapter *adapter,
 893                                 struct ixgb_buffer *buffer_info)
 894 {
 895         if (buffer_info->dma) {
 896                 if (buffer_info->mapped_as_page)
 897                         dma_unmap_page(&adapter->pdev->dev, buffer_info->dma,
 898                                        buffer_info->length, DMA_TO_DEVICE);
 899                 else
 900                         dma_unmap_single(&adapter->pdev->dev, buffer_info->dma,
 901                                          buffer_info->length, DMA_TO_DEVICE);
 902                 buffer_info->dma = 0;
 903         }
 904
 905         if (buffer_info->skb) {
 906                 dev_kfree_skb_any(buffer_info->skb);
 907                 buffer_info->skb = NULL;
 908         }
 909         buffer_info->time_stamp = 0;
 910         /* these fields must always be initialized in tx
 911          * buffer_info->length = 0;
 912          * buffer_info->next_to_watch = 0; */
 913 }
 914
 915 /**
 916  * ixgb_clean_tx_ring - Free Tx Buffers
 917  * @adapter: board private structure
 918  **/
 919
 920 static void
 921 ixgb_clean_tx_ring(struct ixgb_adapter *adapter)
 922 {
 923         struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
 924         struct ixgb_buffer *buffer_info;
 925         unsigned long size;
 926         unsigned int i;
 927
 928         /* Free all the Tx ring sk_buffs */
 929
 930         for (i = 0; i < tx_ring->count; i++) {
 931                 buffer_info = &tx_ring->buffer_info[i];
 932                 ixgb_unmap_and_free_tx_resource(adapter, buffer_info);
 933         }
 934
 935         size = sizeof(struct ixgb_buffer) * tx_ring->count;
 936         memset(tx_ring->buffer_info, 0, size);
 937
 938         /* Zero out the descriptor ring */
 939
 940         memset(tx_ring->desc, 0, tx_ring->size);
 941
 942         tx_ring->next_to_use = 0;
 943         tx_ring->next_to_clean = 0;
 944
 945         IXGB_WRITE_REG(&adapter->hw, TDH, 0);
 946         IXGB_WRITE_REG(&adapter->hw, TDT, 0);
 947 }
 948
 949 /**
 950  * ixgb_free_rx_resources - Free Rx Resources
 951  * @adapter: board private structure
 952  *
 953  * Free all receive software resources
 954  **/
 955
 956 void
 957 ixgb_free_rx_resources(struct ixgb_adapter *adapter)
 958 {
 959         struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
 960         struct pci_dev *pdev = adapter->pdev;
 961
 962         ixgb_clean_rx_ring(adapter);
 963
 964         vfree(rx_ring->buffer_info);
 965         rx_ring->buffer_info = NULL;
 966
 967         dma_free_coherent(&pdev->dev, rx_ring->size, rx_ring->desc,
 968                           rx_ring->dma);
 969
 970         rx_ring->desc = NULL;
 971 }
 972
 973 /**
 974  * ixgb_clean_rx_ring - Free Rx Buffers
 975  * @adapter: board private structure
 976  **/
 977
 978 static void
 979 ixgb_clean_rx_ring(struct ixgb_adapter *adapter)
 980 {
 981         struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
 982         struct ixgb_buffer *buffer_info;
 983         struct pci_dev *pdev = adapter->pdev;
 984         unsigned long size;
 985         unsigned int i;
 986
 987         /* Free all the Rx ring sk_buffs */
 988
 989         for (i = 0; i < rx_ring->count; i++) {
 990                 buffer_info = &rx_ring->buffer_info[i];
 991                 if (buffer_info->dma) {
 992                         dma_unmap_single(&pdev->dev,
 993                                          buffer_info->dma,
 994                                          buffer_info->length,
 995                                          DMA_FROM_DEVICE);
 996                         buffer_info->dma = 0;
 997                         buffer_info->length = 0;
 998                 }
 999
1000                 if (buffer_info->skb) {
1001                         dev_kfree_skb(buffer_info->skb);
1002                         buffer_info->skb = NULL;
1003                 }
1004         }
1005
1006         size = sizeof(struct ixgb_buffer) * rx_ring->count;
1007         memset(rx_ring->buffer_info, 0, size);
1008
1009         /* Zero out the descriptor ring */
1010
1011         memset(rx_ring->desc, 0, rx_ring->size);
1012
1013         rx_ring->next_to_clean = 0;
1014         rx_ring->next_to_use = 0;
1015
1016         IXGB_WRITE_REG(&adapter->hw, RDH, 0);
1017         IXGB_WRITE_REG(&adapter->hw, RDT, 0);
1018 }
1019
1020 /**
1021  * ixgb_set_mac - Change the Ethernet Address of the NIC
1022  * @netdev: network interface device structure
1023  * @p: pointer to an address structure
1024  *
1025  * Returns 0 on success, negative on failure
1026  **/
1027
1028 static int
1029 ixgb_set_mac(struct net_device *netdev, void *p)
1030 {
1031         struct ixgb_adapter *adapter = netdev_priv(netdev);
1032         struct sockaddr *addr = p;
1033
1034         if (!is_valid_ether_addr(addr->sa_data))
1035                 return -EADDRNOTAVAIL;
1036
1037         memcpy(netdev->dev_addr, addr->sa_data, netdev->addr_len);
1038
1039         ixgb_rar_set(&adapter->hw, addr->sa_data, 0);
1040
1041         return 0;
1042 }
1043
1044 /**
1045  * ixgb_set_multi - Multicast and Promiscuous mode set
1046  * @netdev: network interface device structure
1047  *
1048  * The set_multi entry point is called whenever the multicast address
1049  * list or the network interface flags are updated.  This routine is
1050  * responsible for configuring the hardware for proper multicast,
1051  * promiscuous mode, and all-multi behavior.
1052  **/
1053
1054 static void
1055 ixgb_set_multi(struct net_device *netdev)
1056 {
1057         struct ixgb_adapter *adapter = netdev_priv(netdev);
1058         struct ixgb_hw *hw = &adapter->hw;
1059         struct netdev_hw_addr *ha;
1060         u32 rctl;
1061
1062         /* Check for Promiscuous and All Multicast modes */
1063
1064         rctl = IXGB_READ_REG(hw, RCTL);
1065
1066         if (netdev->flags & IFF_PROMISC) {
1067                 rctl |= (IXGB_RCTL_UPE | IXGB_RCTL_MPE);
1068                 /* disable VLAN filtering */
1069                 rctl &= ~IXGB_RCTL_CFIEN;
1070                 rctl &= ~IXGB_RCTL_VFE;
1071         } else {
1072                 if (netdev->flags & IFF_ALLMULTI) {
1073                         rctl |= IXGB_RCTL_MPE;
1074                         rctl &= ~IXGB_RCTL_UPE;
1075                 } else {
1076                         rctl &= ~(IXGB_RCTL_UPE | IXGB_RCTL_MPE);
1077                 }
1078                 /* enable VLAN filtering */
1079                 rctl |= IXGB_RCTL_VFE;
1080                 rctl &= ~IXGB_RCTL_CFIEN;
1081         }
1082
1083         if (netdev_mc_count(netdev) > IXGB_MAX_NUM_MULTICAST_ADDRESSES) {
1084                 rctl |= IXGB_RCTL_MPE;
1085                 IXGB_WRITE_REG(hw, RCTL, rctl);
1086         } else {
1087                 u8 *mta = kmalloc_array(ETH_ALEN,
1088                                         IXGB_MAX_NUM_MULTICAST_ADDRESSES,
1089                                         GFP_ATOMIC);
1090                 u8 *addr;
1091                 if (!mta)
1092                         goto alloc_failed;
1093
1094                 IXGB_WRITE_REG(hw, RCTL, rctl);
1095
1096                 addr = mta;
1097                 netdev_for_each_mc_addr(ha, netdev) {
1098                         memcpy(addr, ha->addr, ETH_ALEN);
1099                         addr += ETH_ALEN;
1100                 }
1101
1102                 ixgb_mc_addr_list_update(hw, mta, netdev_mc_count(netdev), 0);
1103                 kfree(mta);
1104         }
1105
1106 alloc_failed:
1107         if (netdev->features & NETIF_F_HW_VLAN_CTAG_RX)
1108                 ixgb_vlan_strip_enable(adapter);
1109         else
1110                 ixgb_vlan_strip_disable(adapter);
1111
1112 }
1113
1114 /**
1115  * ixgb_watchdog - Timer Call-back
1116  * @data: pointer to netdev cast into an unsigned long
1117  **/
1118
1119 static void
1120 ixgb_watchdog(struct timer_list *t)
1121 {
1122         struct ixgb_adapter *adapter = from_timer(adapter, t, watchdog_timer);
1123         struct net_device *netdev = adapter->netdev;
1124         struct ixgb_desc_ring *txdr = &adapter->tx_ring;
1125
1126         ixgb_check_for_link(&adapter->hw);
1127
1128         if (ixgb_check_for_bad_link(&adapter->hw)) {
1129                 /* force the reset path */
1130                 netif_stop_queue(netdev);
1131         }
1132
1133         if (adapter->hw.link_up) {
1134                 if (!netif_carrier_ok(netdev)) {
1135                         netdev_info(netdev,
1136                                     "NIC Link is Up 10 Gbps Full Duplex, Flow Control: %s\n",
1137                                     (adapter->hw.fc.type == ixgb_fc_full) ?
1138                                     "RX/TX" :
1139                                     (adapter->hw.fc.type == ixgb_fc_rx_pause) ?
1140                                      "RX" :
1141                                     (adapter->hw.fc.type == ixgb_fc_tx_pause) ?
1142                                     "TX" : "None");
1143                         adapter->link_speed = 10000;
1144                         adapter->link_duplex = FULL_DUPLEX;
1145                         netif_carrier_on(netdev);
1146                 }
1147         } else {
1148                 if (netif_carrier_ok(netdev)) {
1149                         adapter->link_speed = 0;
1150                         adapter->link_duplex = 0;
1151                         netdev_info(netdev, "NIC Link is Down\n");
1152                         netif_carrier_off(netdev);
1153                 }
1154         }
1155
1156         ixgb_update_stats(adapter);
1157
1158         if (!netif_carrier_ok(netdev)) {
1159                 if (IXGB_DESC_UNUSED(txdr) + 1 < txdr->count) {
1160                         /* We've lost link, so the controller stops DMA,
1161                          * but we've got queued Tx work that's never going
1162                          * to get done, so reset controller to flush Tx.
1163                          * (Do the reset outside of interrupt context). */
1164                         schedule_work(&adapter->tx_timeout_task);
1165                         /* return immediately since reset is imminent */
1166                         return;
1167                 }
1168         }
1169
1170         /* Force detection of hung controller every watchdog period */
1171         adapter->detect_tx_hung = true;
1172
1173         /* generate an interrupt to force clean up of any stragglers */
1174         IXGB_WRITE_REG(&adapter->hw, ICS, IXGB_INT_TXDW);
1175
1176         /* Reset the timer */
1177         mod_timer(&adapter->watchdog_timer, jiffies + 2 * HZ);
1178 }
1179
1180 #define IXGB_TX_FLAGS_CSUM              0x00000001
1181 #define IXGB_TX_FLAGS_VLAN              0x00000002
1182 #define IXGB_TX_FLAGS_TSO               0x00000004
1183
1184 static int
1185 ixgb_tso(struct ixgb_adapter *adapter, struct sk_buff *skb)
1186 {
1187         struct ixgb_context_desc *context_desc;
1188         unsigned int i;
1189         u8 ipcss, ipcso, tucss, tucso, hdr_len;
1190         u16 ipcse, tucse, mss;
1191
1192         if (likely(skb_is_gso(skb))) {
1193                 struct ixgb_buffer *buffer_info;
1194                 struct iphdr *iph;
1195                 int err;
1196
1197                 err = skb_cow_head(skb, 0);
1198                 if (err < 0)
1199                         return err;
1200
1201                 hdr_len = skb_transport_offset(skb) + tcp_hdrlen(skb);
1202                 mss = skb_shinfo(skb)->gso_size;
1203                 iph = ip_hdr(skb);
1204                 iph->tot_len = 0;
1205                 iph->check = 0;
1206                 tcp_hdr(skb)->check = ~csum_tcpudp_magic(iph->saddr,
1207                                                          iph->daddr, 0,
1208                                                          IPPROTO_TCP, 0);
1209                 ipcss = skb_network_offset(skb);
1210                 ipcso = (void *)&(iph->check) - (void *)skb->data;
1211                 ipcse = skb_transport_offset(skb) - 1;
1212                 tucss = skb_transport_offset(skb);
1213                 tucso = (void *)&(tcp_hdr(skb)->check) - (void *)skb->data;
1214                 tucse = 0;
1215
1216                 i = adapter->tx_ring.next_to_use;
1217                 context_desc = IXGB_CONTEXT_DESC(adapter->tx_ring, i);
1218                 buffer_info = &adapter->tx_ring.buffer_info[i];
1219                 WARN_ON(buffer_info->dma != 0);
1220
1221                 context_desc->ipcss = ipcss;
1222                 context_desc->ipcso = ipcso;
1223                 context_desc->ipcse = cpu_to_le16(ipcse);
1224                 context_desc->tucss = tucss;
1225                 context_desc->tucso = tucso;
1226                 context_desc->tucse = cpu_to_le16(tucse);
1227                 context_desc->mss = cpu_to_le16(mss);
1228                 context_desc->hdr_len = hdr_len;
1229                 context_desc->status = 0;
1230                 context_desc->cmd_type_len = cpu_to_le32(
1231                                                   IXGB_CONTEXT_DESC_TYPE
1232                                                 | IXGB_CONTEXT_DESC_CMD_TSE
1233                                                 | IXGB_CONTEXT_DESC_CMD_IP
1234                                                 | IXGB_CONTEXT_DESC_CMD_TCP
1235                                                 | IXGB_CONTEXT_DESC_CMD_IDE
1236                                                 | (skb->len - (hdr_len)));
1237
1238
1239                 if (++i == adapter->tx_ring.count) i = 0;
1240                 adapter->tx_ring.next_to_use = i;
1241
1242                 return 1;
1243         }
1244
1245         return 0;
1246 }
1247
1248 static bool
1249 ixgb_tx_csum(struct ixgb_adapter *adapter, struct sk_buff *skb)
1250 {
1251         struct ixgb_context_desc *context_desc;
1252         unsigned int i;
1253         u8 css, cso;
1254
1255         if (likely(skb->ip_summed == CHECKSUM_PARTIAL)) {
1256                 struct ixgb_buffer *buffer_info;
1257                 css = skb_checksum_start_offset(skb);
1258                 cso = css + skb->csum_offset;
1259
1260                 i = adapter->tx_ring.next_to_use;
1261                 context_desc = IXGB_CONTEXT_DESC(adapter->tx_ring, i);
1262                 buffer_info = &adapter->tx_ring.buffer_info[i];
1263                 WARN_ON(buffer_info->dma != 0);
1264
1265                 context_desc->tucss = css;
1266                 context_desc->tucso = cso;
1267                 context_desc->tucse = 0;
1268                 /* zero out any previously existing data in one instruction */
1269                 *(u32 *)&(context_desc->ipcss) = 0;
1270                 context_desc->status = 0;
1271                 context_desc->hdr_len = 0;
1272                 context_desc->mss = 0;
1273                 context_desc->cmd_type_len =
1274                         cpu_to_le32(IXGB_CONTEXT_DESC_TYPE
1275                                     | IXGB_TX_DESC_CMD_IDE);
1276
1277                 if (++i == adapter->tx_ring.count) i = 0;
1278                 adapter->tx_ring.next_to_use = i;
1279
1280                 return true;
1281         }
1282
1283         return false;
1284 }
1285
1286 #define IXGB_MAX_TXD_PWR        14
1287 #define IXGB_MAX_DATA_PER_TXD   (1<<IXGB_MAX_TXD_PWR)
1288
1289 static int
1290 ixgb_tx_map(struct ixgb_adapter *adapter, struct sk_buff *skb,
1291             unsigned int first)
1292 {
1293         struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
1294         struct pci_dev *pdev = adapter->pdev;
1295         struct ixgb_buffer *buffer_info;
1296         int len = skb_headlen(skb);
1297         unsigned int offset = 0, size, count = 0, i;
1298         unsigned int mss = skb_shinfo(skb)->gso_size;
1299         unsigned int nr_frags = skb_shinfo(skb)->nr_frags;
1300         unsigned int f;
1301
1302         i = tx_ring->next_to_use;
1303
1304         while (len) {
1305                 buffer_info = &tx_ring->buffer_info[i];
1306                 size = min(len, IXGB_MAX_DATA_PER_TXD);
1307                 /* Workaround for premature desc write-backs
1308                  * in TSO mode.  Append 4-byte sentinel desc */
1309                 if (unlikely(mss && !nr_frags && size == len && size > 8))
1310                         size -= 4;
1311
1312                 buffer_info->length = size;
1313                 WARN_ON(buffer_info->dma != 0);
1314                 buffer_info->time_stamp = jiffies;
1315                 buffer_info->mapped_as_page = false;
1316                 buffer_info->dma = dma_map_single(&pdev->dev,
1317                                                   skb->data + offset,
1318                                                   size, DMA_TO_DEVICE);
1319                 if (dma_mapping_error(&pdev->dev, buffer_info->dma))
1320                         goto dma_error;
1321                 buffer_info->next_to_watch = 0;
1322
1323                 len -= size;
1324                 offset += size;
1325                 count++;
1326                 if (len) {
1327                         i++;
1328                         if (i == tx_ring->count)
1329                                 i = 0;
1330                 }
1331         }
1332
1333         for (f = 0; f < nr_frags; f++) {
1334                 const skb_frag_t *frag = &skb_shinfo(skb)->frags[f];
1335                 len = skb_frag_size(frag);
1336                 offset = 0;
1337
1338                 while (len) {
1339                         i++;
1340                         if (i == tx_ring->count)
1341                                 i = 0;
1342
1343                         buffer_info = &tx_ring->buffer_info[i];
1344                         size = min(len, IXGB_MAX_DATA_PER_TXD);
1345
1346                         /* Workaround for premature desc write-backs
1347                          * in TSO mode.  Append 4-byte sentinel desc */
1348                         if (unlikely(mss && (f == (nr_frags - 1))
1349                                      && size == len && size > 8))
1350                                 size -= 4;
1351
1352                         buffer_info->length = size;
1353                         buffer_info->time_stamp = jiffies;
1354                         buffer_info->mapped_as_page = true;
1355                         buffer_info->dma =
1356                                 skb_frag_dma_map(&pdev->dev, frag, offset, size,
1357                                                  DMA_TO_DEVICE);
1358                         if (dma_mapping_error(&pdev->dev, buffer_info->dma))
1359                                 goto dma_error;
1360                         buffer_info->next_to_watch = 0;
1361
1362                         len -= size;
1363                         offset += size;
1364                         count++;
1365                 }
1366         }
1367         tx_ring->buffer_info[i].skb = skb;
1368         tx_ring->buffer_info[first].next_to_watch = i;
1369
1370         return count;
1371
1372 dma_error:
1373         dev_err(&pdev->dev, "TX DMA map failed\n");
1374         buffer_info->dma = 0;
1375         if (count)
1376                 count--;
1377
1378         while (count--) {
1379                 if (i==0)
1380                         i += tx_ring->count;
1381                 i--;
1382                 buffer_info = &tx_ring->buffer_info[i];
1383                 ixgb_unmap_and_free_tx_resource(adapter, buffer_info);
1384         }
1385
1386         return 0;
1387 }
1388
1389 static void
1390 ixgb_tx_queue(struct ixgb_adapter *adapter, int count, int vlan_id,int tx_flags)
1391 {
1392         struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
1393         struct ixgb_tx_desc *tx_desc = NULL;
1394         struct ixgb_buffer *buffer_info;
1395         u32 cmd_type_len = adapter->tx_cmd_type;
1396         u8 status = 0;
1397         u8 popts = 0;
1398         unsigned int i;
1399
1400         if (tx_flags & IXGB_TX_FLAGS_TSO) {
1401                 cmd_type_len |= IXGB_TX_DESC_CMD_TSE;
1402                 popts |= (IXGB_TX_DESC_POPTS_IXSM | IXGB_TX_DESC_POPTS_TXSM);
1403         }
1404
1405         if (tx_flags & IXGB_TX_FLAGS_CSUM)
1406                 popts |= IXGB_TX_DESC_POPTS_TXSM;
1407
1408         if (tx_flags & IXGB_TX_FLAGS_VLAN)
1409                 cmd_type_len |= IXGB_TX_DESC_CMD_VLE;
1410
1411         i = tx_ring->next_to_use;
1412
1413         while (count--) {
1414                 buffer_info = &tx_ring->buffer_info[i];
1415                 tx_desc = IXGB_TX_DESC(*tx_ring, i);
1416                 tx_desc->buff_addr = cpu_to_le64(buffer_info->dma);
1417                 tx_desc->cmd_type_len =
1418                         cpu_to_le32(cmd_type_len | buffer_info->length);
1419                 tx_desc->status = status;
1420                 tx_desc->popts = popts;
1421                 tx_desc->vlan = cpu_to_le16(vlan_id);
1422
1423                 if (++i == tx_ring->count) i = 0;
1424         }
1425
1426         tx_desc->cmd_type_len |=
1427                 cpu_to_le32(IXGB_TX_DESC_CMD_EOP | IXGB_TX_DESC_CMD_RS);
1428
1429         /* Force memory writes to complete before letting h/w
1430          * know there are new descriptors to fetch.  (Only
1431          * applicable for weak-ordered memory model archs,
1432          * such as IA-64). */
1433         wmb();
1434
1435         tx_ring->next_to_use = i;
1436         IXGB_WRITE_REG(&adapter->hw, TDT, i);
1437 }
1438
1439 static int __ixgb_maybe_stop_tx(struct net_device *netdev, int size)
1440 {
1441         struct ixgb_adapter *adapter = netdev_priv(netdev);
1442         struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
1443
1444         netif_stop_queue(netdev);
1445         /* Herbert's original patch had:
1446          *  smp_mb__after_netif_stop_queue();
1447          * but since that doesn't exist yet, just open code it. */
1448         smp_mb();
1449
1450         /* We need to check again in a case another CPU has just
1451          * made room available. */
1452         if (likely(IXGB_DESC_UNUSED(tx_ring) < size))
1453                 return -EBUSY;
1454
1455         /* A reprieve! */
1456         netif_start_queue(netdev);
1457         ++adapter->restart_queue;
1458         return 0;
1459 }
1460
1461 static int ixgb_maybe_stop_tx(struct net_device *netdev,
1462                               struct ixgb_desc_ring *tx_ring, int size)
1463 {
1464         if (likely(IXGB_DESC_UNUSED(tx_ring) >= size))
1465                 return 0;
1466         return __ixgb_maybe_stop_tx(netdev, size);
1467 }
1468
1469
1470 /* Tx Descriptors needed, worst case */
1471 #define TXD_USE_COUNT(S) (((S) >> IXGB_MAX_TXD_PWR) + \
1472                          (((S) & (IXGB_MAX_DATA_PER_TXD - 1)) ? 1 : 0))
1473 #define DESC_NEEDED TXD_USE_COUNT(IXGB_MAX_DATA_PER_TXD) /* skb->date */ + \
1474         MAX_SKB_FRAGS * TXD_USE_COUNT(PAGE_SIZE) + 1 /* for context */ \
1475         + 1 /* one more needed for sentinel TSO workaround */
1476
1477 static netdev_tx_t
1478 ixgb_xmit_frame(struct sk_buff *skb, struct net_device *netdev)
1479 {
1480         struct ixgb_adapter *adapter = netdev_priv(netdev);
1481         unsigned int first;
1482         unsigned int tx_flags = 0;
1483         int vlan_id = 0;
1484         int count = 0;
1485         int tso;
1486
1487         if (test_bit(__IXGB_DOWN, &adapter->flags)) {
1488                 dev_kfree_skb_any(skb);
1489                 return NETDEV_TX_OK;
1490         }
1491
1492         if (skb->len <= 0) {
1493                 dev_kfree_skb_any(skb);
1494                 return NETDEV_TX_OK;
1495         }
1496
1497         if (unlikely(ixgb_maybe_stop_tx(netdev, &adapter->tx_ring,
1498                      DESC_NEEDED)))
1499                 return NETDEV_TX_BUSY;
1500
1501         if (skb_vlan_tag_present(skb)) {
1502                 tx_flags |= IXGB_TX_FLAGS_VLAN;
1503                 vlan_id = skb_vlan_tag_get(skb);
1504         }
1505
1506         first = adapter->tx_ring.next_to_use;
1507
1508         tso = ixgb_tso(adapter, skb);
1509         if (tso < 0) {
1510                 dev_kfree_skb_any(skb);
1511                 return NETDEV_TX_OK;
1512         }
1513
1514         if (likely(tso))
1515                 tx_flags |= IXGB_TX_FLAGS_TSO;
1516         else if (ixgb_tx_csum(adapter, skb))
1517                 tx_flags |= IXGB_TX_FLAGS_CSUM;
1518
1519         count = ixgb_tx_map(adapter, skb, first);
1520
1521         if (count) {
1522                 ixgb_tx_queue(adapter, count, vlan_id, tx_flags);
1523                 /* Make sure there is space in the ring for the next send. */
1524                 ixgb_maybe_stop_tx(netdev, &adapter->tx_ring, DESC_NEEDED);
1525
1526         } else {
1527                 dev_kfree_skb_any(skb);
1528                 adapter->tx_ring.buffer_info[first].time_stamp = 0;
1529                 adapter->tx_ring.next_to_use = first;
1530         }
1531
1532         return NETDEV_TX_OK;
1533 }
1534
1535 /**
1536  * ixgb_tx_timeout - Respond to a Tx Hang
1537  * @netdev: network interface device structure
1538  **/
1539
1540 static void
1541 ixgb_tx_timeout(struct net_device *netdev, unsigned int txqueue)
1542 {
1543         struct ixgb_adapter *adapter = netdev_priv(netdev);
1544
1545         /* Do the reset outside of interrupt context */
1546         schedule_work(&adapter->tx_timeout_task);
1547 }
1548
1549 static void
1550 ixgb_tx_timeout_task(struct work_struct *work)
1551 {
1552         struct ixgb_adapter *adapter =
1553                 container_of(work, struct ixgb_adapter, tx_timeout_task);
1554
1555         adapter->tx_timeout_count++;
1556         ixgb_down(adapter, true);
1557         ixgb_up(adapter);
1558 }
1559
1560 /**
1561  * ixgb_change_mtu - Change the Maximum Transfer Unit
1562  * @netdev: network interface device structure
1563  * @new_mtu: new value for maximum frame size
1564  *
1565  * Returns 0 on success, negative on failure
1566  **/
1567
1568 static int
1569 ixgb_change_mtu(struct net_device *netdev, int new_mtu)
1570 {
1571         struct ixgb_adapter *adapter = netdev_priv(netdev);
1572         int max_frame = new_mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;
1573
1574         if (netif_running(netdev))
1575                 ixgb_down(adapter, true);
1576
1577         adapter->rx_buffer_len = max_frame + 8; /* + 8 for errata */
1578
1579         netdev->mtu = new_mtu;
1580
1581         if (netif_running(netdev))
1582                 ixgb_up(adapter);
1583
1584         return 0;
1585 }
1586
1587 /**
1588  * ixgb_update_stats - Update the board statistics counters.
1589  * @adapter: board private structure
1590  **/
1591
1592 void
1593 ixgb_update_stats(struct ixgb_adapter *adapter)
1594 {
1595         struct net_device *netdev = adapter->netdev;
1596         struct pci_dev *pdev = adapter->pdev;
1597
1598         /* Prevent stats update while adapter is being reset */
1599         if (pci_channel_offline(pdev))
1600                 return;
1601
1602         if ((netdev->flags & IFF_PROMISC) || (netdev->flags & IFF_ALLMULTI) ||
1603            (netdev_mc_count(netdev) > IXGB_MAX_NUM_MULTICAST_ADDRESSES)) {
1604                 u64 multi = IXGB_READ_REG(&adapter->hw, MPRCL);
1605                 u32 bcast_l = IXGB_READ_REG(&adapter->hw, BPRCL);
1606                 u32 bcast_h = IXGB_READ_REG(&adapter->hw, BPRCH);
1607                 u64 bcast = ((u64)bcast_h << 32) | bcast_l;
1608
1609                 multi |= ((u64)IXGB_READ_REG(&adapter->hw, MPRCH) << 32);
1610                 /* fix up multicast stats by removing broadcasts */
1611                 if (multi >= bcast)
1612                         multi -= bcast;
1613
1614                 adapter->stats.mprcl += (multi & 0xFFFFFFFF);
1615                 adapter->stats.mprch += (multi >> 32);
1616                 adapter->stats.bprcl += bcast_l;
1617                 adapter->stats.bprch += bcast_h;
1618         } else {
1619                 adapter->stats.mprcl += IXGB_READ_REG(&adapter->hw, MPRCL);
1620                 adapter->stats.mprch += IXGB_READ_REG(&adapter->hw, MPRCH);
1621                 adapter->stats.bprcl += IXGB_READ_REG(&adapter->hw, BPRCL);
1622                 adapter->stats.bprch += IXGB_READ_REG(&adapter->hw, BPRCH);
1623         }
1624         adapter->stats.tprl += IXGB_READ_REG(&adapter->hw, TPRL);
1625         adapter->stats.tprh += IXGB_READ_REG(&adapter->hw, TPRH);
1626         adapter->stats.gprcl += IXGB_READ_REG(&adapter->hw, GPRCL);
1627         adapter->stats.gprch += IXGB_READ_REG(&adapter->hw, GPRCH);
1628         adapter->stats.uprcl += IXGB_READ_REG(&adapter->hw, UPRCL);
1629         adapter->stats.uprch += IXGB_READ_REG(&adapter->hw, UPRCH);
1630         adapter->stats.vprcl += IXGB_READ_REG(&adapter->hw, VPRCL);
1631         adapter->stats.vprch += IXGB_READ_REG(&adapter->hw, VPRCH);
1632         adapter->stats.jprcl += IXGB_READ_REG(&adapter->hw, JPRCL);
1633         adapter->stats.jprch += IXGB_READ_REG(&adapter->hw, JPRCH);
1634         adapter->stats.gorcl += IXGB_READ_REG(&adapter->hw, GORCL);
1635         adapter->stats.gorch += IXGB_READ_REG(&adapter->hw, GORCH);
1636         adapter->stats.torl += IXGB_READ_REG(&adapter->hw, TORL);
1637         adapter->stats.torh += IXGB_READ_REG(&adapter->hw, TORH);
1638         adapter->stats.rnbc += IXGB_READ_REG(&adapter->hw, RNBC);
1639         adapter->stats.ruc += IXGB_READ_REG(&adapter->hw, RUC);
1640         adapter->stats.roc += IXGB_READ_REG(&adapter->hw, ROC);
1641         adapter->stats.rlec += IXGB_READ_REG(&adapter->hw, RLEC);
1642         adapter->stats.crcerrs += IXGB_READ_REG(&adapter->hw, CRCERRS);
1643         adapter->stats.icbc += IXGB_READ_REG(&adapter->hw, ICBC);
1644         adapter->stats.ecbc += IXGB_READ_REG(&adapter->hw, ECBC);
1645         adapter->stats.mpc += IXGB_READ_REG(&adapter->hw, MPC);
1646         adapter->stats.tptl += IXGB_READ_REG(&adapter->hw, TPTL);
1647         adapter->stats.tpth += IXGB_READ_REG(&adapter->hw, TPTH);
1648         adapter->stats.gptcl += IXGB_READ_REG(&adapter->hw, GPTCL);
1649         adapter->stats.gptch += IXGB_READ_REG(&adapter->hw, GPTCH);
1650         adapter->stats.bptcl += IXGB_READ_REG(&adapter->hw, BPTCL);
1651         adapter->stats.bptch += IXGB_READ_REG(&adapter->hw, BPTCH);
1652         adapter->stats.mptcl += IXGB_READ_REG(&adapter->hw, MPTCL);
1653         adapter->stats.mptch += IXGB_READ_REG(&adapter->hw, MPTCH);
1654         adapter->stats.uptcl += IXGB_READ_REG(&adapter->hw, UPTCL);
1655         adapter->stats.uptch += IXGB_READ_REG(&adapter->hw, UPTCH);
1656         adapter->stats.vptcl += IXGB_READ_REG(&adapter->hw, VPTCL);
1657         adapter->stats.vptch += IXGB_READ_REG(&adapter->hw, VPTCH);
1658         adapter->stats.jptcl += IXGB_READ_REG(&adapter->hw, JPTCL);
1659         adapter->stats.jptch += IXGB_READ_REG(&adapter->hw, JPTCH);
1660         adapter->stats.gotcl += IXGB_READ_REG(&adapter->hw, GOTCL);
1661         adapter->stats.gotch += IXGB_READ_REG(&adapter->hw, GOTCH);
1662         adapter->stats.totl += IXGB_READ_REG(&adapter->hw, TOTL);
1663         adapter->stats.toth += IXGB_READ_REG(&adapter->hw, TOTH);
1664         adapter->stats.dc += IXGB_READ_REG(&adapter->hw, DC);
1665         adapter->stats.plt64c += IXGB_READ_REG(&adapter->hw, PLT64C);
1666         adapter->stats.tsctc += IXGB_READ_REG(&adapter->hw, TSCTC);
1667         adapter->stats.tsctfc += IXGB_READ_REG(&adapter->hw, TSCTFC);
1668         adapter->stats.ibic += IXGB_READ_REG(&adapter->hw, IBIC);
1669         adapter->stats.rfc += IXGB_READ_REG(&adapter->hw, RFC);
1670         adapter->stats.lfc += IXGB_READ_REG(&adapter->hw, LFC);
1671         adapter->stats.pfrc += IXGB_READ_REG(&adapter->hw, PFRC);
1672         adapter->stats.pftc += IXGB_READ_REG(&adapter->hw, PFTC);
1673         adapter->stats.mcfrc += IXGB_READ_REG(&adapter->hw, MCFRC);
1674         adapter->stats.mcftc += IXGB_READ_REG(&adapter->hw, MCFTC);
1675         adapter->stats.xonrxc += IXGB_READ_REG(&adapter->hw, XONRXC);
1676         adapter->stats.xontxc += IXGB_READ_REG(&adapter->hw, XONTXC);
1677         adapter->stats.xoffrxc += IXGB_READ_REG(&adapter->hw, XOFFRXC);
1678         adapter->stats.xofftxc += IXGB_READ_REG(&adapter->hw, XOFFTXC);
1679         adapter->stats.rjc += IXGB_READ_REG(&adapter->hw, RJC);
1680
1681         /* Fill out the OS statistics structure */
1682
1683         netdev->stats.rx_packets = adapter->stats.gprcl;
1684         netdev->stats.tx_packets = adapter->stats.gptcl;
1685         netdev->stats.rx_bytes = adapter->stats.gorcl;
1686         netdev->stats.tx_bytes = adapter->stats.gotcl;
1687         netdev->stats.multicast = adapter->stats.mprcl;
1688         netdev->stats.collisions = 0;
1689
1690         /* ignore RLEC as it reports errors for padded (<64bytes) frames
1691          * with a length in the type/len field */
1692         netdev->stats.rx_errors =
1693             /* adapter->stats.rnbc + */ adapter->stats.crcerrs +
1694             adapter->stats.ruc +
1695             adapter->stats.roc /*+ adapter->stats.rlec */  +
1696             adapter->stats.icbc +
1697             adapter->stats.ecbc + adapter->stats.mpc;
1698
1699         /* see above
1700          * netdev->stats.rx_length_errors = adapter->stats.rlec;
1701          */
1702
1703         netdev->stats.rx_crc_errors = adapter->stats.crcerrs;
1704         netdev->stats.rx_fifo_errors = adapter->stats.mpc;
1705         netdev->stats.rx_missed_errors = adapter->stats.mpc;
1706         netdev->stats.rx_over_errors = adapter->stats.mpc;
1707
1708         netdev->stats.tx_errors = 0;
1709         netdev->stats.rx_frame_errors = 0;
1710         netdev->stats.tx_aborted_errors = 0;
1711         netdev->stats.tx_carrier_errors = 0;
1712         netdev->stats.tx_fifo_errors = 0;
1713         netdev->stats.tx_heartbeat_errors = 0;
1714         netdev->stats.tx_window_errors = 0;
1715 }
1716
1717 #define IXGB_MAX_INTR 10
1718 /**
1719  * ixgb_intr - Interrupt Handler
1720  * @irq: interrupt number
1721  * @data: pointer to a network interface device structure
1722  **/
1723
1724 static irqreturn_t
1725 ixgb_intr(int irq, void *data)
1726 {
1727         struct net_device *netdev = data;
1728         struct ixgb_adapter *adapter = netdev_priv(netdev);
1729         struct ixgb_hw *hw = &adapter->hw;
1730         u32 icr = IXGB_READ_REG(hw, ICR);
1731
1732         if (unlikely(!icr))
1733                 return IRQ_NONE;  /* Not our interrupt */
1734
1735         if (unlikely(icr & (IXGB_INT_RXSEQ | IXGB_INT_LSC)))
1736                 if (!test_bit(__IXGB_DOWN, &adapter->flags))
1737                         mod_timer(&adapter->watchdog_timer, jiffies);
1738
1739         if (napi_schedule_prep(&adapter->napi)) {
1740
1741                 /* Disable interrupts and register for poll. The flush
1742                   of the posted write is intentionally left out.
1743                 */
1744
1745                 IXGB_WRITE_REG(&adapter->hw, IMC, ~0);
1746                 __napi_schedule(&adapter->napi);
1747         }
1748         return IRQ_HANDLED;
1749 }
1750
1751 /**
1752  * ixgb_clean - NAPI Rx polling callback
1753  * @adapter: board private structure
1754  **/
1755
1756 static int
1757 ixgb_clean(struct napi_struct *napi, int budget)
1758 {
1759         struct ixgb_adapter *adapter = container_of(napi, struct ixgb_adapter, napi);
1760         int work_done = 0;
1761
1762         ixgb_clean_tx_irq(adapter);
1763         ixgb_clean_rx_irq(adapter, &work_done, budget);
1764
1765         /* If budget not fully consumed, exit the polling mode */
1766         if (work_done < budget) {
1767                 napi_complete_done(napi, work_done);
1768                 if (!test_bit(__IXGB_DOWN, &adapter->flags))
1769                         ixgb_irq_enable(adapter);
1770         }
1771
1772         return work_done;
1773 }
1774
1775 /**
1776  * ixgb_clean_tx_irq - Reclaim resources after transmit completes
1777  * @adapter: board private structure
1778  **/
1779
1780 static bool
1781 ixgb_clean_tx_irq(struct ixgb_adapter *adapter)
1782 {
1783         struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
1784         struct net_device *netdev = adapter->netdev;
1785         struct ixgb_tx_desc *tx_desc, *eop_desc;
1786         struct ixgb_buffer *buffer_info;
1787         unsigned int i, eop;
1788         bool cleaned = false;
1789
1790         i = tx_ring->next_to_clean;
1791         eop = tx_ring->buffer_info[i].next_to_watch;
1792         eop_desc = IXGB_TX_DESC(*tx_ring, eop);
1793
1794         while (eop_desc->status & IXGB_TX_DESC_STATUS_DD) {
1795
1796                 rmb(); /* read buffer_info after eop_desc */
1797                 for (cleaned = false; !cleaned; ) {
1798                         tx_desc = IXGB_TX_DESC(*tx_ring, i);
1799                         buffer_info = &tx_ring->buffer_info[i];
1800
1801                         if (tx_desc->popts &
1802                            (IXGB_TX_DESC_POPTS_TXSM |
1803                             IXGB_TX_DESC_POPTS_IXSM))
1804                                 adapter->hw_csum_tx_good++;
1805
1806                         ixgb_unmap_and_free_tx_resource(adapter, buffer_info);
1807
1808                         *(u32 *)&(tx_desc->status) = 0;
1809
1810                         cleaned = (i == eop);
1811                         if (++i == tx_ring->count) i = 0;
1812                 }
1813
1814                 eop = tx_ring->buffer_info[i].next_to_watch;
1815                 eop_desc = IXGB_TX_DESC(*tx_ring, eop);
1816         }
1817
1818         tx_ring->next_to_clean = i;
1819
1820         if (unlikely(cleaned && netif_carrier_ok(netdev) &&
1821                      IXGB_DESC_UNUSED(tx_ring) >= DESC_NEEDED)) {
1822                 /* Make sure that anybody stopping the queue after this
1823                  * sees the new next_to_clean. */
1824                 smp_mb();
1825
1826                 if (netif_queue_stopped(netdev) &&
1827                     !(test_bit(__IXGB_DOWN, &adapter->flags))) {
1828                         netif_wake_queue(netdev);
1829                         ++adapter->restart_queue;
1830                 }
1831         }
1832
1833         if (adapter->detect_tx_hung) {
1834                 /* detect a transmit hang in hardware, this serializes the
1835                  * check with the clearing of time_stamp and movement of i */
1836                 adapter->detect_tx_hung = false;
1837                 if (tx_ring->buffer_info[eop].time_stamp &&
1838                    time_after(jiffies, tx_ring->buffer_info[eop].time_stamp + HZ)
1839                    && !(IXGB_READ_REG(&adapter->hw, STATUS) &
1840                         IXGB_STATUS_TXOFF)) {
1841                         /* detected Tx unit hang */
1842                         netif_err(adapter, drv, adapter->netdev,
1843                                   "Detected Tx Unit Hang\n"
1844                                   "  TDH                  <%x>\n"
1845                                   "  TDT                  <%x>\n"
1846                                   "  next_to_use          <%x>\n"
1847                                   "  next_to_clean        <%x>\n"
1848                                   "buffer_info[next_to_clean]\n"
1849                                   "  time_stamp           <%lx>\n"
1850                                   "  next_to_watch        <%x>\n"
1851                                   "  jiffies              <%lx>\n"
1852                                   "  next_to_watch.status <%x>\n",
1853                                   IXGB_READ_REG(&adapter->hw, TDH),
1854                                   IXGB_READ_REG(&adapter->hw, TDT),
1855                                   tx_ring->next_to_use,
1856                                   tx_ring->next_to_clean,
1857                                   tx_ring->buffer_info[eop].time_stamp,
1858                                   eop,
1859                                   jiffies,
1860                                   eop_desc->status);
1861                         netif_stop_queue(netdev);
1862                 }
1863         }
1864
1865         return cleaned;
1866 }
1867
1868 /**
1869  * ixgb_rx_checksum - Receive Checksum Offload for 82597.
1870  * @adapter: board private structure
1871  * @rx_desc: receive descriptor
1872  * @sk_buff: socket buffer with received data
1873  **/
1874
1875 static void
1876 ixgb_rx_checksum(struct ixgb_adapter *adapter,
1877                  struct ixgb_rx_desc *rx_desc,
1878                  struct sk_buff *skb)
1879 {
1880         /* Ignore Checksum bit is set OR
1881          * TCP Checksum has not been calculated
1882          */
1883         if ((rx_desc->status & IXGB_RX_DESC_STATUS_IXSM) ||
1884            (!(rx_desc->status & IXGB_RX_DESC_STATUS_TCPCS))) {
1885                 skb_checksum_none_assert(skb);
1886                 return;
1887         }
1888
1889         /* At this point we know the hardware did the TCP checksum */
1890         /* now look at the TCP checksum error bit */
1891         if (rx_desc->errors & IXGB_RX_DESC_ERRORS_TCPE) {
1892                 /* let the stack verify checksum errors */
1893                 skb_checksum_none_assert(skb);
1894                 adapter->hw_csum_rx_error++;
1895         } else {
1896                 /* TCP checksum is good */
1897                 skb->ip_summed = CHECKSUM_UNNECESSARY;
1898                 adapter->hw_csum_rx_good++;
1899         }
1900 }
1901
1902 /*
1903  * this should improve performance for small packets with large amounts
1904  * of reassembly being done in the stack
1905  */
1906 static void ixgb_check_copybreak(struct napi_struct *napi,
1907                                  struct ixgb_buffer *buffer_info,
1908                                  u32 length, struct sk_buff **skb)
1909 {
1910         struct sk_buff *new_skb;
1911
1912         if (length > copybreak)
1913                 return;
1914
1915         new_skb = napi_alloc_skb(napi, length);
1916         if (!new_skb)
1917                 return;
1918
1919         skb_copy_to_linear_data_offset(new_skb, -NET_IP_ALIGN,
1920                                        (*skb)->data - NET_IP_ALIGN,
1921                                        length + NET_IP_ALIGN);
1922         /* save the skb in buffer_info as good */
1923         buffer_info->skb = *skb;
1924         *skb = new_skb;
1925 }
1926
1927 /**
1928  * ixgb_clean_rx_irq - Send received data up the network stack,
1929  * @adapter: board private structure
1930  **/
1931
1932 static bool
1933 ixgb_clean_rx_irq(struct ixgb_adapter *adapter, int *work_done, int work_to_do)
1934 {
1935         struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
1936         struct net_device *netdev = adapter->netdev;
1937         struct pci_dev *pdev = adapter->pdev;
1938         struct ixgb_rx_desc *rx_desc, *next_rxd;
1939         struct ixgb_buffer *buffer_info, *next_buffer, *next2_buffer;
1940         u32 length;
1941         unsigned int i, j;
1942         int cleaned_count = 0;
1943         bool cleaned = false;
1944
1945         i = rx_ring->next_to_clean;
1946         rx_desc = IXGB_RX_DESC(*rx_ring, i);
1947         buffer_info = &rx_ring->buffer_info[i];
1948
1949         while (rx_desc->status & IXGB_RX_DESC_STATUS_DD) {
1950                 struct sk_buff *skb;
1951                 u8 status;
1952
1953                 if (*work_done >= work_to_do)
1954                         break;
1955
1956                 (*work_done)++;
1957                 rmb();  /* read descriptor and rx_buffer_info after status DD */
1958                 status = rx_desc->status;
1959                 skb = buffer_info->skb;
1960                 buffer_info->skb = NULL;
1961
1962                 prefetch(skb->data - NET_IP_ALIGN);
1963
1964                 if (++i == rx_ring->count)
1965                         i = 0;
1966                 next_rxd = IXGB_RX_DESC(*rx_ring, i);
1967                 prefetch(next_rxd);
1968
1969                 j = i + 1;
1970                 if (j == rx_ring->count)
1971                         j = 0;
1972                 next2_buffer = &rx_ring->buffer_info[j];
1973                 prefetch(next2_buffer);
1974
1975                 next_buffer = &rx_ring->buffer_info[i];
1976
1977                 cleaned = true;
1978                 cleaned_count++;
1979
1980                 dma_unmap_single(&pdev->dev,
1981                                  buffer_info->dma,
1982                                  buffer_info->length,
1983                                  DMA_FROM_DEVICE);
1984                 buffer_info->dma = 0;
1985
1986                 length = le16_to_cpu(rx_desc->length);
1987                 rx_desc->length = 0;
1988
1989                 if (unlikely(!(status & IXGB_RX_DESC_STATUS_EOP))) {
1990
1991                         /* All receives must fit into a single buffer */
1992
1993                         pr_debug("Receive packet consumed multiple buffers length<%x>\n",
1994                                  length);
1995
1996                         dev_kfree_skb_irq(skb);
1997                         goto rxdesc_done;
1998                 }
1999
2000                 if (unlikely(rx_desc->errors &
2001                     (IXGB_RX_DESC_ERRORS_CE | IXGB_RX_DESC_ERRORS_SE |
2002                      IXGB_RX_DESC_ERRORS_P | IXGB_RX_DESC_ERRORS_RXE))) {
2003                         dev_kfree_skb_irq(skb);
2004                         goto rxdesc_done;
2005                 }
2006
2007                 ixgb_check_copybreak(&adapter->napi, buffer_info, length, &skb);
2008
2009                 /* Good Receive */
2010                 skb_put(skb, length);
2011
2012                 /* Receive Checksum Offload */
2013                 ixgb_rx_checksum(adapter, rx_desc, skb);
2014
2015                 skb->protocol = eth_type_trans(skb, netdev);
2016                 if (status & IXGB_RX_DESC_STATUS_VP)
2017                         __vlan_hwaccel_put_tag(skb, htons(ETH_P_8021Q),
2018                                        le16_to_cpu(rx_desc->special));
2019
2020                 netif_receive_skb(skb);
2021
2022 rxdesc_done:
2023                 /* clean up descriptor, might be written over by hw */
2024                 rx_desc->status = 0;
2025
2026                 /* return some buffers to hardware, one at a time is too slow */
2027                 if (unlikely(cleaned_count >= IXGB_RX_BUFFER_WRITE)) {
2028                         ixgb_alloc_rx_buffers(adapter, cleaned_count);
2029                         cleaned_count = 0;
2030                 }
2031
2032                 /* use prefetched values */
2033                 rx_desc = next_rxd;
2034                 buffer_info = next_buffer;
2035         }
2036
2037         rx_ring->next_to_clean = i;
2038
2039         cleaned_count = IXGB_DESC_UNUSED(rx_ring);
2040         if (cleaned_count)
2041                 ixgb_alloc_rx_buffers(adapter, cleaned_count);
2042
2043         return cleaned;
2044 }
2045
2046 /**
2047  * ixgb_alloc_rx_buffers - Replace used receive buffers
2048  * @adapter: address of board private structure
2049  **/
2050
2051 static void
2052 ixgb_alloc_rx_buffers(struct ixgb_adapter *adapter, int cleaned_count)
2053 {
2054         struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
2055         struct net_device *netdev = adapter->netdev;
2056         struct pci_dev *pdev = adapter->pdev;
2057         struct ixgb_rx_desc *rx_desc;
2058         struct ixgb_buffer *buffer_info;
2059         struct sk_buff *skb;
2060         unsigned int i;
2061         long cleancount;
2062
2063         i = rx_ring->next_to_use;
2064         buffer_info = &rx_ring->buffer_info[i];
2065         cleancount = IXGB_DESC_UNUSED(rx_ring);
2066
2067
2068         /* leave three descriptors unused */
2069         while (--cleancount > 2 && cleaned_count--) {
2070                 /* recycle! its good for you */
2071                 skb = buffer_info->skb;
2072                 if (skb) {
2073                         skb_trim(skb, 0);
2074                         goto map_skb;
2075                 }
2076
2077                 skb = netdev_alloc_skb_ip_align(netdev, adapter->rx_buffer_len);
2078                 if (unlikely(!skb)) {
2079                         /* Better luck next round */
2080                         adapter->alloc_rx_buff_failed++;
2081                         break;
2082                 }
2083
2084                 buffer_info->skb = skb;
2085                 buffer_info->length = adapter->rx_buffer_len;
2086 map_skb:
2087                 buffer_info->dma = dma_map_single(&pdev->dev,
2088                                                   skb->data,
2089                                                   adapter->rx_buffer_len,
2090                                                   DMA_FROM_DEVICE);
2091                 if (dma_mapping_error(&pdev->dev, buffer_info->dma)) {
2092                         adapter->alloc_rx_buff_failed++;
2093                         break;
2094                 }
2095
2096                 rx_desc = IXGB_RX_DESC(*rx_ring, i);
2097                 rx_desc->buff_addr = cpu_to_le64(buffer_info->dma);
2098                 /* guarantee DD bit not set now before h/w gets descriptor
2099                  * this is the rest of the workaround for h/w double
2100                  * writeback. */
2101                 rx_desc->status = 0;
2102
2103
2104                 if (++i == rx_ring->count)
2105                         i = 0;
2106                 buffer_info = &rx_ring->buffer_info[i];
2107         }
2108
2109         if (likely(rx_ring->next_to_use != i)) {
2110                 rx_ring->next_to_use = i;
2111                 if (unlikely(i-- == 0))
2112                         i = (rx_ring->count - 1);
2113
2114                 /* Force memory writes to complete before letting h/w
2115                  * know there are new descriptors to fetch.  (Only
2116                  * applicable for weak-ordered memory model archs, such
2117                  * as IA-64). */
2118                 wmb();
2119                 IXGB_WRITE_REG(&adapter->hw, RDT, i);
2120         }
2121 }
2122
2123 static void
2124 ixgb_vlan_strip_enable(struct ixgb_adapter *adapter)
2125 {
2126         u32 ctrl;
2127
2128         /* enable VLAN tag insert/strip */
2129         ctrl = IXGB_READ_REG(&adapter->hw, CTRL0);
2130         ctrl |= IXGB_CTRL0_VME;
2131         IXGB_WRITE_REG(&adapter->hw, CTRL0, ctrl);
2132 }
2133
2134 static void
2135 ixgb_vlan_strip_disable(struct ixgb_adapter *adapter)
2136 {
2137         u32 ctrl;
2138
2139         /* disable VLAN tag insert/strip */
2140         ctrl = IXGB_READ_REG(&adapter->hw, CTRL0);
2141         ctrl &= ~IXGB_CTRL0_VME;
2142         IXGB_WRITE_REG(&adapter->hw, CTRL0, ctrl);
2143 }
2144
2145 static int
2146 ixgb_vlan_rx_add_vid(struct net_device *netdev, __be16 proto, u16 vid)
2147 {
2148         struct ixgb_adapter *adapter = netdev_priv(netdev);
2149         u32 vfta, index;
2150
2151         /* add VID to filter table */
2152
2153         index = (vid >> 5) & 0x7F;
2154         vfta = IXGB_READ_REG_ARRAY(&adapter->hw, VFTA, index);
2155         vfta |= (1 << (vid & 0x1F));
2156         ixgb_write_vfta(&adapter->hw, index, vfta);
2157         set_bit(vid, adapter->active_vlans);
2158
2159         return 0;
2160 }
2161
2162 static int
2163 ixgb_vlan_rx_kill_vid(struct net_device *netdev, __be16 proto, u16 vid)
2164 {
2165         struct ixgb_adapter *adapter = netdev_priv(netdev);
2166         u32 vfta, index;
2167
2168         /* remove VID from filter table */
2169
2170         index = (vid >> 5) & 0x7F;
2171         vfta = IXGB_READ_REG_ARRAY(&adapter->hw, VFTA, index);
2172         vfta &= ~(1 << (vid & 0x1F));
2173         ixgb_write_vfta(&adapter->hw, index, vfta);
2174         clear_bit(vid, adapter->active_vlans);
2175
2176         return 0;
2177 }
2178
2179 static void
2180 ixgb_restore_vlan(struct ixgb_adapter *adapter)
2181 {
2182         u16 vid;
2183
2184         for_each_set_bit(vid, adapter->active_vlans, VLAN_N_VID)
2185                 ixgb_vlan_rx_add_vid(adapter->netdev, htons(ETH_P_8021Q), vid);
2186 }
2187
2188 /**
2189  * ixgb_io_error_detected - called when PCI error is detected
2190  * @pdev:    pointer to pci device with error
2191  * @state:   pci channel state after error
2192  *
2193  * This callback is called by the PCI subsystem whenever
2194  * a PCI bus error is detected.
2195  */
2196 static pci_ers_result_t ixgb_io_error_detected(struct pci_dev *pdev,
2197                                                enum pci_channel_state state)
2198 {
2199         struct net_device *netdev = pci_get_drvdata(pdev);
2200         struct ixgb_adapter *adapter = netdev_priv(netdev);
2201
2202         netif_device_detach(netdev);
2203
2204         if (state == pci_channel_io_perm_failure)
2205                 return PCI_ERS_RESULT_DISCONNECT;
2206
2207         if (netif_running(netdev))
2208                 ixgb_down(adapter, true);
2209
2210         pci_disable_device(pdev);
2211
2212         /* Request a slot reset. */
2213         return PCI_ERS_RESULT_NEED_RESET;
2214 }
2215
2216 /**
2217  * ixgb_io_slot_reset - called after the pci bus has been reset.
2218  * @pdev    pointer to pci device with error
2219  *
2220  * This callback is called after the PCI bus has been reset.
2221  * Basically, this tries to restart the card from scratch.
2222  * This is a shortened version of the device probe/discovery code,
2223  * it resembles the first-half of the ixgb_probe() routine.
2224  */
2225 static pci_ers_result_t ixgb_io_slot_reset(struct pci_dev *pdev)
2226 {
2227         struct net_device *netdev = pci_get_drvdata(pdev);
2228         struct ixgb_adapter *adapter = netdev_priv(netdev);
2229
2230         if (pci_enable_device(pdev)) {
2231                 netif_err(adapter, probe, adapter->netdev,
2232                           "Cannot re-enable PCI device after reset\n");
2233                 return PCI_ERS_RESULT_DISCONNECT;
2234         }
2235
2236         /* Perform card reset only on one instance of the card */
2237         if (0 != PCI_FUNC (pdev->devfn))
2238                 return PCI_ERS_RESULT_RECOVERED;
2239
2240         pci_set_master(pdev);
2241
2242         netif_carrier_off(netdev);
2243         netif_stop_queue(netdev);
2244         ixgb_reset(adapter);
2245
2246         /* Make sure the EEPROM is good */
2247         if (!ixgb_validate_eeprom_checksum(&adapter->hw)) {
2248                 netif_err(adapter, probe, adapter->netdev,
2249                           "After reset, the EEPROM checksum is not valid\n");
2250                 return PCI_ERS_RESULT_DISCONNECT;
2251         }
2252         ixgb_get_ee_mac_addr(&adapter->hw, netdev->dev_addr);
2253         memcpy(netdev->perm_addr, netdev->dev_addr, netdev->addr_len);
2254
2255         if (!is_valid_ether_addr(netdev->perm_addr)) {
2256                 netif_err(adapter, probe, adapter->netdev,
2257                           "After reset, invalid MAC address\n");
2258                 return PCI_ERS_RESULT_DISCONNECT;
2259         }
2260
2261         return PCI_ERS_RESULT_RECOVERED;
2262 }
2263
2264 /**
2265  * ixgb_io_resume - called when its OK to resume normal operations
2266  * @pdev    pointer to pci device with error
2267  *
2268  * The error recovery driver tells us that its OK to resume
2269  * normal operation. Implementation resembles the second-half
2270  * of the ixgb_probe() routine.
2271  */
2272 static void ixgb_io_resume(struct pci_dev *pdev)
2273 {
2274         struct net_device *netdev = pci_get_drvdata(pdev);
2275         struct ixgb_adapter *adapter = netdev_priv(netdev);
2276
2277         pci_set_master(pdev);
2278
2279         if (netif_running(netdev)) {
2280                 if (ixgb_up(adapter)) {
2281                         pr_err("can't bring device back up after reset\n");
2282                         return;
2283                 }
2284         }
2285
2286         netif_device_attach(netdev);
2287         mod_timer(&adapter->watchdog_timer, jiffies);
2288 }
2289
2290 /* ixgb_main.c */