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_array(ETH_ALEN,
1097                                         IXGB_MAX_NUM_MULTICAST_ADDRESSES,
1098                                         GFP_ATOMIC);
1099                 u8 *addr;
1100                 if (!mta)
1101                         goto alloc_failed;
1102
1103                 IXGB_WRITE_REG(hw, RCTL, rctl);
1104
1105                 addr = mta;
1106                 netdev_for_each_mc_addr(ha, netdev) {
1107                         memcpy(addr, ha->addr, ETH_ALEN);
1108                         addr += ETH_ALEN;
1109                 }
1110
1111                 ixgb_mc_addr_list_update(hw, mta, netdev_mc_count(netdev), 0);
1112                 kfree(mta);
1113         }
1114
1115 alloc_failed:
1116         if (netdev->features & NETIF_F_HW_VLAN_CTAG_RX)
1117                 ixgb_vlan_strip_enable(adapter);
1118         else
1119                 ixgb_vlan_strip_disable(adapter);
1120
1121 }
1122
1123 /**
1124  * ixgb_watchdog - Timer Call-back
1125  * @data: pointer to netdev cast into an unsigned long
1126  **/
1127
1128 static void
1129 ixgb_watchdog(struct timer_list *t)
1130 {
1131         struct ixgb_adapter *adapter = from_timer(adapter, t, watchdog_timer);
1132         struct net_device *netdev = adapter->netdev;
1133         struct ixgb_desc_ring *txdr = &adapter->tx_ring;
1134
1135         ixgb_check_for_link(&adapter->hw);
1136
1137         if (ixgb_check_for_bad_link(&adapter->hw)) {
1138                 /* force the reset path */
1139                 netif_stop_queue(netdev);
1140         }
1141
1142         if (adapter->hw.link_up) {
1143                 if (!netif_carrier_ok(netdev)) {
1144                         netdev_info(netdev,
1145                                     "NIC Link is Up 10 Gbps Full Duplex, Flow Control: %s\n",
1146                                     (adapter->hw.fc.type == ixgb_fc_full) ?
1147                                     "RX/TX" :
1148                                     (adapter->hw.fc.type == ixgb_fc_rx_pause) ?
1149                                      "RX" :
1150                                     (adapter->hw.fc.type == ixgb_fc_tx_pause) ?
1151                                     "TX" : "None");
1152                         adapter->link_speed = 10000;
1153                         adapter->link_duplex = FULL_DUPLEX;
1154                         netif_carrier_on(netdev);
1155                 }
1156         } else {
1157                 if (netif_carrier_ok(netdev)) {
1158                         adapter->link_speed = 0;
1159                         adapter->link_duplex = 0;
1160                         netdev_info(netdev, "NIC Link is Down\n");
1161                         netif_carrier_off(netdev);
1162                 }
1163         }
1164
1165         ixgb_update_stats(adapter);
1166
1167         if (!netif_carrier_ok(netdev)) {
1168                 if (IXGB_DESC_UNUSED(txdr) + 1 < txdr->count) {
1169                         /* We've lost link, so the controller stops DMA,
1170                          * but we've got queued Tx work that's never going
1171                          * to get done, so reset controller to flush Tx.
1172                          * (Do the reset outside of interrupt context). */
1173                         schedule_work(&adapter->tx_timeout_task);
1174                         /* return immediately since reset is imminent */
1175                         return;
1176                 }
1177         }
1178
1179         /* Force detection of hung controller every watchdog period */
1180         adapter->detect_tx_hung = true;
1181
1182         /* generate an interrupt to force clean up of any stragglers */
1183         IXGB_WRITE_REG(&adapter->hw, ICS, IXGB_INT_TXDW);
1184
1185         /* Reset the timer */
1186         mod_timer(&adapter->watchdog_timer, jiffies + 2 * HZ);
1187 }
1188
1189 #define IXGB_TX_FLAGS_CSUM              0x00000001
1190 #define IXGB_TX_FLAGS_VLAN              0x00000002
1191 #define IXGB_TX_FLAGS_TSO               0x00000004
1192
1193 static int
1194 ixgb_tso(struct ixgb_adapter *adapter, struct sk_buff *skb)
1195 {
1196         struct ixgb_context_desc *context_desc;
1197         unsigned int i;
1198         u8 ipcss, ipcso, tucss, tucso, hdr_len;
1199         u16 ipcse, tucse, mss;
1200
1201         if (likely(skb_is_gso(skb))) {
1202                 struct ixgb_buffer *buffer_info;
1203                 struct iphdr *iph;
1204                 int err;
1205
1206                 err = skb_cow_head(skb, 0);
1207                 if (err < 0)
1208                         return err;
1209
1210                 hdr_len = skb_transport_offset(skb) + tcp_hdrlen(skb);
1211                 mss = skb_shinfo(skb)->gso_size;
1212                 iph = ip_hdr(skb);
1213                 iph->tot_len = 0;
1214                 iph->check = 0;
1215                 tcp_hdr(skb)->check = ~csum_tcpudp_magic(iph->saddr,
1216                                                          iph->daddr, 0,
1217                                                          IPPROTO_TCP, 0);
1218                 ipcss = skb_network_offset(skb);
1219                 ipcso = (void *)&(iph->check) - (void *)skb->data;
1220                 ipcse = skb_transport_offset(skb) - 1;
1221                 tucss = skb_transport_offset(skb);
1222                 tucso = (void *)&(tcp_hdr(skb)->check) - (void *)skb->data;
1223                 tucse = 0;
1224
1225                 i = adapter->tx_ring.next_to_use;
1226                 context_desc = IXGB_CONTEXT_DESC(adapter->tx_ring, i);
1227                 buffer_info = &adapter->tx_ring.buffer_info[i];
1228                 WARN_ON(buffer_info->dma != 0);
1229
1230                 context_desc->ipcss = ipcss;
1231                 context_desc->ipcso = ipcso;
1232                 context_desc->ipcse = cpu_to_le16(ipcse);
1233                 context_desc->tucss = tucss;
1234                 context_desc->tucso = tucso;
1235                 context_desc->tucse = cpu_to_le16(tucse);
1236                 context_desc->mss = cpu_to_le16(mss);
1237                 context_desc->hdr_len = hdr_len;
1238                 context_desc->status = 0;
1239                 context_desc->cmd_type_len = cpu_to_le32(
1240                                                   IXGB_CONTEXT_DESC_TYPE
1241                                                 | IXGB_CONTEXT_DESC_CMD_TSE
1242                                                 | IXGB_CONTEXT_DESC_CMD_IP
1243                                                 | IXGB_CONTEXT_DESC_CMD_TCP
1244                                                 | IXGB_CONTEXT_DESC_CMD_IDE
1245                                                 | (skb->len - (hdr_len)));
1246
1247
1248                 if (++i == adapter->tx_ring.count) i = 0;
1249                 adapter->tx_ring.next_to_use = i;
1250
1251                 return 1;
1252         }
1253
1254         return 0;
1255 }
1256
1257 static bool
1258 ixgb_tx_csum(struct ixgb_adapter *adapter, struct sk_buff *skb)
1259 {
1260         struct ixgb_context_desc *context_desc;
1261         unsigned int i;
1262         u8 css, cso;
1263
1264         if (likely(skb->ip_summed == CHECKSUM_PARTIAL)) {
1265                 struct ixgb_buffer *buffer_info;
1266                 css = skb_checksum_start_offset(skb);
1267                 cso = css + skb->csum_offset;
1268
1269                 i = adapter->tx_ring.next_to_use;
1270                 context_desc = IXGB_CONTEXT_DESC(adapter->tx_ring, i);
1271                 buffer_info = &adapter->tx_ring.buffer_info[i];
1272                 WARN_ON(buffer_info->dma != 0);
1273
1274                 context_desc->tucss = css;
1275                 context_desc->tucso = cso;
1276                 context_desc->tucse = 0;
1277                 /* zero out any previously existing data in one instruction */
1278                 *(u32 *)&(context_desc->ipcss) = 0;
1279                 context_desc->status = 0;
1280                 context_desc->hdr_len = 0;
1281                 context_desc->mss = 0;
1282                 context_desc->cmd_type_len =
1283                         cpu_to_le32(IXGB_CONTEXT_DESC_TYPE
1284                                     | IXGB_TX_DESC_CMD_IDE);
1285
1286                 if (++i == adapter->tx_ring.count) i = 0;
1287                 adapter->tx_ring.next_to_use = i;
1288
1289                 return true;
1290         }
1291
1292         return false;
1293 }
1294
1295 #define IXGB_MAX_TXD_PWR        14
1296 #define IXGB_MAX_DATA_PER_TXD   (1<<IXGB_MAX_TXD_PWR)
1297
1298 static int
1299 ixgb_tx_map(struct ixgb_adapter *adapter, struct sk_buff *skb,
1300             unsigned int first)
1301 {
1302         struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
1303         struct pci_dev *pdev = adapter->pdev;
1304         struct ixgb_buffer *buffer_info;
1305         int len = skb_headlen(skb);
1306         unsigned int offset = 0, size, count = 0, i;
1307         unsigned int mss = skb_shinfo(skb)->gso_size;
1308         unsigned int nr_frags = skb_shinfo(skb)->nr_frags;
1309         unsigned int f;
1310
1311         i = tx_ring->next_to_use;
1312
1313         while (len) {
1314                 buffer_info = &tx_ring->buffer_info[i];
1315                 size = min(len, IXGB_MAX_DATA_PER_TXD);
1316                 /* Workaround for premature desc write-backs
1317                  * in TSO mode.  Append 4-byte sentinel desc */
1318                 if (unlikely(mss && !nr_frags && size == len && size > 8))
1319                         size -= 4;
1320
1321                 buffer_info->length = size;
1322                 WARN_ON(buffer_info->dma != 0);
1323                 buffer_info->time_stamp = jiffies;
1324                 buffer_info->mapped_as_page = false;
1325                 buffer_info->dma = dma_map_single(&pdev->dev,
1326                                                   skb->data + offset,
1327                                                   size, DMA_TO_DEVICE);
1328                 if (dma_mapping_error(&pdev->dev, buffer_info->dma))
1329                         goto dma_error;
1330                 buffer_info->next_to_watch = 0;
1331
1332                 len -= size;
1333                 offset += size;
1334                 count++;
1335                 if (len) {
1336                         i++;
1337                         if (i == tx_ring->count)
1338                                 i = 0;
1339                 }
1340         }
1341
1342         for (f = 0; f < nr_frags; f++) {
1343                 const struct skb_frag_struct *frag;
1344
1345                 frag = &skb_shinfo(skb)->frags[f];
1346                 len = skb_frag_size(frag);
1347                 offset = 0;
1348
1349                 while (len) {
1350                         i++;
1351                         if (i == tx_ring->count)
1352                                 i = 0;
1353
1354                         buffer_info = &tx_ring->buffer_info[i];
1355                         size = min(len, IXGB_MAX_DATA_PER_TXD);
1356
1357                         /* Workaround for premature desc write-backs
1358                          * in TSO mode.  Append 4-byte sentinel desc */
1359                         if (unlikely(mss && (f == (nr_frags - 1))
1360                                      && size == len && size > 8))
1361                                 size -= 4;
1362
1363                         buffer_info->length = size;
1364                         buffer_info->time_stamp = jiffies;
1365                         buffer_info->mapped_as_page = true;
1366                         buffer_info->dma =
1367                                 skb_frag_dma_map(&pdev->dev, frag, offset, size,
1368                                                  DMA_TO_DEVICE);
1369                         if (dma_mapping_error(&pdev->dev, buffer_info->dma))
1370                                 goto dma_error;
1371                         buffer_info->next_to_watch = 0;
1372
1373                         len -= size;
1374                         offset += size;
1375                         count++;
1376                 }
1377         }
1378         tx_ring->buffer_info[i].skb = skb;
1379         tx_ring->buffer_info[first].next_to_watch = i;
1380
1381         return count;
1382
1383 dma_error:
1384         dev_err(&pdev->dev, "TX DMA map failed\n");
1385         buffer_info->dma = 0;
1386         if (count)
1387                 count--;
1388
1389         while (count--) {
1390                 if (i==0)
1391                         i += tx_ring->count;
1392                 i--;
1393                 buffer_info = &tx_ring->buffer_info[i];
1394                 ixgb_unmap_and_free_tx_resource(adapter, buffer_info);
1395         }
1396
1397         return 0;
1398 }
1399
1400 static void
1401 ixgb_tx_queue(struct ixgb_adapter *adapter, int count, int vlan_id,int tx_flags)
1402 {
1403         struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
1404         struct ixgb_tx_desc *tx_desc = NULL;
1405         struct ixgb_buffer *buffer_info;
1406         u32 cmd_type_len = adapter->tx_cmd_type;
1407         u8 status = 0;
1408         u8 popts = 0;
1409         unsigned int i;
1410
1411         if (tx_flags & IXGB_TX_FLAGS_TSO) {
1412                 cmd_type_len |= IXGB_TX_DESC_CMD_TSE;
1413                 popts |= (IXGB_TX_DESC_POPTS_IXSM | IXGB_TX_DESC_POPTS_TXSM);
1414         }
1415
1416         if (tx_flags & IXGB_TX_FLAGS_CSUM)
1417                 popts |= IXGB_TX_DESC_POPTS_TXSM;
1418
1419         if (tx_flags & IXGB_TX_FLAGS_VLAN)
1420                 cmd_type_len |= IXGB_TX_DESC_CMD_VLE;
1421
1422         i = tx_ring->next_to_use;
1423
1424         while (count--) {
1425                 buffer_info = &tx_ring->buffer_info[i];
1426                 tx_desc = IXGB_TX_DESC(*tx_ring, i);
1427                 tx_desc->buff_addr = cpu_to_le64(buffer_info->dma);
1428                 tx_desc->cmd_type_len =
1429                         cpu_to_le32(cmd_type_len | buffer_info->length);
1430                 tx_desc->status = status;
1431                 tx_desc->popts = popts;
1432                 tx_desc->vlan = cpu_to_le16(vlan_id);
1433
1434                 if (++i == tx_ring->count) i = 0;
1435         }
1436
1437         tx_desc->cmd_type_len |=
1438                 cpu_to_le32(IXGB_TX_DESC_CMD_EOP | IXGB_TX_DESC_CMD_RS);
1439
1440         /* Force memory writes to complete before letting h/w
1441          * know there are new descriptors to fetch.  (Only
1442          * applicable for weak-ordered memory model archs,
1443          * such as IA-64). */
1444         wmb();
1445
1446         tx_ring->next_to_use = i;
1447         IXGB_WRITE_REG(&adapter->hw, TDT, i);
1448 }
1449
1450 static int __ixgb_maybe_stop_tx(struct net_device *netdev, int size)
1451 {
1452         struct ixgb_adapter *adapter = netdev_priv(netdev);
1453         struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
1454
1455         netif_stop_queue(netdev);
1456         /* Herbert's original patch had:
1457          *  smp_mb__after_netif_stop_queue();
1458          * but since that doesn't exist yet, just open code it. */
1459         smp_mb();
1460
1461         /* We need to check again in a case another CPU has just
1462          * made room available. */
1463         if (likely(IXGB_DESC_UNUSED(tx_ring) < size))
1464                 return -EBUSY;
1465
1466         /* A reprieve! */
1467         netif_start_queue(netdev);
1468         ++adapter->restart_queue;
1469         return 0;
1470 }
1471
1472 static int ixgb_maybe_stop_tx(struct net_device *netdev,
1473                               struct ixgb_desc_ring *tx_ring, int size)
1474 {
1475         if (likely(IXGB_DESC_UNUSED(tx_ring) >= size))
1476                 return 0;
1477         return __ixgb_maybe_stop_tx(netdev, size);
1478 }
1479
1480
1481 /* Tx Descriptors needed, worst case */
1482 #define TXD_USE_COUNT(S) (((S) >> IXGB_MAX_TXD_PWR) + \
1483                          (((S) & (IXGB_MAX_DATA_PER_TXD - 1)) ? 1 : 0))
1484 #define DESC_NEEDED TXD_USE_COUNT(IXGB_MAX_DATA_PER_TXD) /* skb->date */ + \
1485         MAX_SKB_FRAGS * TXD_USE_COUNT(PAGE_SIZE) + 1 /* for context */ \
1486         + 1 /* one more needed for sentinel TSO workaround */
1487
1488 static netdev_tx_t
1489 ixgb_xmit_frame(struct sk_buff *skb, struct net_device *netdev)
1490 {
1491         struct ixgb_adapter *adapter = netdev_priv(netdev);
1492         unsigned int first;
1493         unsigned int tx_flags = 0;
1494         int vlan_id = 0;
1495         int count = 0;
1496         int tso;
1497
1498         if (test_bit(__IXGB_DOWN, &adapter->flags)) {
1499                 dev_kfree_skb_any(skb);
1500                 return NETDEV_TX_OK;
1501         }
1502
1503         if (skb->len <= 0) {
1504                 dev_kfree_skb_any(skb);
1505                 return NETDEV_TX_OK;
1506         }
1507
1508         if (unlikely(ixgb_maybe_stop_tx(netdev, &adapter->tx_ring,
1509                      DESC_NEEDED)))
1510                 return NETDEV_TX_BUSY;
1511
1512         if (skb_vlan_tag_present(skb)) {
1513                 tx_flags |= IXGB_TX_FLAGS_VLAN;
1514                 vlan_id = skb_vlan_tag_get(skb);
1515         }
1516
1517         first = adapter->tx_ring.next_to_use;
1518
1519         tso = ixgb_tso(adapter, skb);
1520         if (tso < 0) {
1521                 dev_kfree_skb_any(skb);
1522                 return NETDEV_TX_OK;
1523         }
1524
1525         if (likely(tso))
1526                 tx_flags |= IXGB_TX_FLAGS_TSO;
1527         else if (ixgb_tx_csum(adapter, skb))
1528                 tx_flags |= IXGB_TX_FLAGS_CSUM;
1529
1530         count = ixgb_tx_map(adapter, skb, first);
1531
1532         if (count) {
1533                 ixgb_tx_queue(adapter, count, vlan_id, tx_flags);
1534                 /* Make sure there is space in the ring for the next send. */
1535                 ixgb_maybe_stop_tx(netdev, &adapter->tx_ring, DESC_NEEDED);
1536
1537         } else {
1538                 dev_kfree_skb_any(skb);
1539                 adapter->tx_ring.buffer_info[first].time_stamp = 0;
1540                 adapter->tx_ring.next_to_use = first;
1541         }
1542
1543         return NETDEV_TX_OK;
1544 }
1545
1546 /**
1547  * ixgb_tx_timeout - Respond to a Tx Hang
1548  * @netdev: network interface device structure
1549  **/
1550
1551 static void
1552 ixgb_tx_timeout(struct net_device *netdev)
1553 {
1554         struct ixgb_adapter *adapter = netdev_priv(netdev);
1555
1556         /* Do the reset outside of interrupt context */
1557         schedule_work(&adapter->tx_timeout_task);
1558 }
1559
1560 static void
1561 ixgb_tx_timeout_task(struct work_struct *work)
1562 {
1563         struct ixgb_adapter *adapter =
1564                 container_of(work, struct ixgb_adapter, tx_timeout_task);
1565
1566         adapter->tx_timeout_count++;
1567         ixgb_down(adapter, true);
1568         ixgb_up(adapter);
1569 }
1570
1571 /**
1572  * ixgb_change_mtu - Change the Maximum Transfer Unit
1573  * @netdev: network interface device structure
1574  * @new_mtu: new value for maximum frame size
1575  *
1576  * Returns 0 on success, negative on failure
1577  **/
1578
1579 static int
1580 ixgb_change_mtu(struct net_device *netdev, int new_mtu)
1581 {
1582         struct ixgb_adapter *adapter = netdev_priv(netdev);
1583         int max_frame = new_mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;
1584
1585         if (netif_running(netdev))
1586                 ixgb_down(adapter, true);
1587
1588         adapter->rx_buffer_len = max_frame + 8; /* + 8 for errata */
1589
1590         netdev->mtu = new_mtu;
1591
1592         if (netif_running(netdev))
1593                 ixgb_up(adapter);
1594
1595         return 0;
1596 }
1597
1598 /**
1599  * ixgb_update_stats - Update the board statistics counters.
1600  * @adapter: board private structure
1601  **/
1602
1603 void
1604 ixgb_update_stats(struct ixgb_adapter *adapter)
1605 {
1606         struct net_device *netdev = adapter->netdev;
1607         struct pci_dev *pdev = adapter->pdev;
1608
1609         /* Prevent stats update while adapter is being reset */
1610         if (pci_channel_offline(pdev))
1611                 return;
1612
1613         if ((netdev->flags & IFF_PROMISC) || (netdev->flags & IFF_ALLMULTI) ||
1614            (netdev_mc_count(netdev) > IXGB_MAX_NUM_MULTICAST_ADDRESSES)) {
1615                 u64 multi = IXGB_READ_REG(&adapter->hw, MPRCL);
1616                 u32 bcast_l = IXGB_READ_REG(&adapter->hw, BPRCL);
1617                 u32 bcast_h = IXGB_READ_REG(&adapter->hw, BPRCH);
1618                 u64 bcast = ((u64)bcast_h << 32) | bcast_l;
1619
1620                 multi |= ((u64)IXGB_READ_REG(&adapter->hw, MPRCH) << 32);
1621                 /* fix up multicast stats by removing broadcasts */
1622                 if (multi >= bcast)
1623                         multi -= bcast;
1624
1625                 adapter->stats.mprcl += (multi & 0xFFFFFFFF);
1626                 adapter->stats.mprch += (multi >> 32);
1627                 adapter->stats.bprcl += bcast_l;
1628                 adapter->stats.bprch += bcast_h;
1629         } else {
1630                 adapter->stats.mprcl += IXGB_READ_REG(&adapter->hw, MPRCL);
1631                 adapter->stats.mprch += IXGB_READ_REG(&adapter->hw, MPRCH);
1632                 adapter->stats.bprcl += IXGB_READ_REG(&adapter->hw, BPRCL);
1633                 adapter->stats.bprch += IXGB_READ_REG(&adapter->hw, BPRCH);
1634         }
1635         adapter->stats.tprl += IXGB_READ_REG(&adapter->hw, TPRL);
1636         adapter->stats.tprh += IXGB_READ_REG(&adapter->hw, TPRH);
1637         adapter->stats.gprcl += IXGB_READ_REG(&adapter->hw, GPRCL);
1638         adapter->stats.gprch += IXGB_READ_REG(&adapter->hw, GPRCH);
1639         adapter->stats.uprcl += IXGB_READ_REG(&adapter->hw, UPRCL);
1640         adapter->stats.uprch += IXGB_READ_REG(&adapter->hw, UPRCH);
1641         adapter->stats.vprcl += IXGB_READ_REG(&adapter->hw, VPRCL);
1642         adapter->stats.vprch += IXGB_READ_REG(&adapter->hw, VPRCH);
1643         adapter->stats.jprcl += IXGB_READ_REG(&adapter->hw, JPRCL);
1644         adapter->stats.jprch += IXGB_READ_REG(&adapter->hw, JPRCH);
1645         adapter->stats.gorcl += IXGB_READ_REG(&adapter->hw, GORCL);
1646         adapter->stats.gorch += IXGB_READ_REG(&adapter->hw, GORCH);
1647         adapter->stats.torl += IXGB_READ_REG(&adapter->hw, TORL);
1648         adapter->stats.torh += IXGB_READ_REG(&adapter->hw, TORH);
1649         adapter->stats.rnbc += IXGB_READ_REG(&adapter->hw, RNBC);
1650         adapter->stats.ruc += IXGB_READ_REG(&adapter->hw, RUC);
1651         adapter->stats.roc += IXGB_READ_REG(&adapter->hw, ROC);
1652         adapter->stats.rlec += IXGB_READ_REG(&adapter->hw, RLEC);
1653         adapter->stats.crcerrs += IXGB_READ_REG(&adapter->hw, CRCERRS);
1654         adapter->stats.icbc += IXGB_READ_REG(&adapter->hw, ICBC);
1655         adapter->stats.ecbc += IXGB_READ_REG(&adapter->hw, ECBC);
1656         adapter->stats.mpc += IXGB_READ_REG(&adapter->hw, MPC);
1657         adapter->stats.tptl += IXGB_READ_REG(&adapter->hw, TPTL);
1658         adapter->stats.tpth += IXGB_READ_REG(&adapter->hw, TPTH);
1659         adapter->stats.gptcl += IXGB_READ_REG(&adapter->hw, GPTCL);
1660         adapter->stats.gptch += IXGB_READ_REG(&adapter->hw, GPTCH);
1661         adapter->stats.bptcl += IXGB_READ_REG(&adapter->hw, BPTCL);
1662         adapter->stats.bptch += IXGB_READ_REG(&adapter->hw, BPTCH);
1663         adapter->stats.mptcl += IXGB_READ_REG(&adapter->hw, MPTCL);
1664         adapter->stats.mptch += IXGB_READ_REG(&adapter->hw, MPTCH);
1665         adapter->stats.uptcl += IXGB_READ_REG(&adapter->hw, UPTCL);
1666         adapter->stats.uptch += IXGB_READ_REG(&adapter->hw, UPTCH);
1667         adapter->stats.vptcl += IXGB_READ_REG(&adapter->hw, VPTCL);
1668         adapter->stats.vptch += IXGB_READ_REG(&adapter->hw, VPTCH);
1669         adapter->stats.jptcl += IXGB_READ_REG(&adapter->hw, JPTCL);
1670         adapter->stats.jptch += IXGB_READ_REG(&adapter->hw, JPTCH);
1671         adapter->stats.gotcl += IXGB_READ_REG(&adapter->hw, GOTCL);
1672         adapter->stats.gotch += IXGB_READ_REG(&adapter->hw, GOTCH);
1673         adapter->stats.totl += IXGB_READ_REG(&adapter->hw, TOTL);
1674         adapter->stats.toth += IXGB_READ_REG(&adapter->hw, TOTH);
1675         adapter->stats.dc += IXGB_READ_REG(&adapter->hw, DC);
1676         adapter->stats.plt64c += IXGB_READ_REG(&adapter->hw, PLT64C);
1677         adapter->stats.tsctc += IXGB_READ_REG(&adapter->hw, TSCTC);
1678         adapter->stats.tsctfc += IXGB_READ_REG(&adapter->hw, TSCTFC);
1679         adapter->stats.ibic += IXGB_READ_REG(&adapter->hw, IBIC);
1680         adapter->stats.rfc += IXGB_READ_REG(&adapter->hw, RFC);
1681         adapter->stats.lfc += IXGB_READ_REG(&adapter->hw, LFC);
1682         adapter->stats.pfrc += IXGB_READ_REG(&adapter->hw, PFRC);
1683         adapter->stats.pftc += IXGB_READ_REG(&adapter->hw, PFTC);
1684         adapter->stats.mcfrc += IXGB_READ_REG(&adapter->hw, MCFRC);
1685         adapter->stats.mcftc += IXGB_READ_REG(&adapter->hw, MCFTC);
1686         adapter->stats.xonrxc += IXGB_READ_REG(&adapter->hw, XONRXC);
1687         adapter->stats.xontxc += IXGB_READ_REG(&adapter->hw, XONTXC);
1688         adapter->stats.xoffrxc += IXGB_READ_REG(&adapter->hw, XOFFRXC);
1689         adapter->stats.xofftxc += IXGB_READ_REG(&adapter->hw, XOFFTXC);
1690         adapter->stats.rjc += IXGB_READ_REG(&adapter->hw, RJC);
1691
1692         /* Fill out the OS statistics structure */
1693
1694         netdev->stats.rx_packets = adapter->stats.gprcl;
1695         netdev->stats.tx_packets = adapter->stats.gptcl;
1696         netdev->stats.rx_bytes = adapter->stats.gorcl;
1697         netdev->stats.tx_bytes = adapter->stats.gotcl;
1698         netdev->stats.multicast = adapter->stats.mprcl;
1699         netdev->stats.collisions = 0;
1700
1701         /* ignore RLEC as it reports errors for padded (<64bytes) frames
1702          * with a length in the type/len field */
1703         netdev->stats.rx_errors =
1704             /* adapter->stats.rnbc + */ adapter->stats.crcerrs +
1705             adapter->stats.ruc +
1706             adapter->stats.roc /*+ adapter->stats.rlec */  +
1707             adapter->stats.icbc +
1708             adapter->stats.ecbc + adapter->stats.mpc;
1709
1710         /* see above
1711          * netdev->stats.rx_length_errors = adapter->stats.rlec;
1712          */
1713
1714         netdev->stats.rx_crc_errors = adapter->stats.crcerrs;
1715         netdev->stats.rx_fifo_errors = adapter->stats.mpc;
1716         netdev->stats.rx_missed_errors = adapter->stats.mpc;
1717         netdev->stats.rx_over_errors = adapter->stats.mpc;
1718
1719         netdev->stats.tx_errors = 0;
1720         netdev->stats.rx_frame_errors = 0;
1721         netdev->stats.tx_aborted_errors = 0;
1722         netdev->stats.tx_carrier_errors = 0;
1723         netdev->stats.tx_fifo_errors = 0;
1724         netdev->stats.tx_heartbeat_errors = 0;
1725         netdev->stats.tx_window_errors = 0;
1726 }
1727
1728 #define IXGB_MAX_INTR 10
1729 /**
1730  * ixgb_intr - Interrupt Handler
1731  * @irq: interrupt number
1732  * @data: pointer to a network interface device structure
1733  **/
1734
1735 static irqreturn_t
1736 ixgb_intr(int irq, void *data)
1737 {
1738         struct net_device *netdev = data;
1739         struct ixgb_adapter *adapter = netdev_priv(netdev);
1740         struct ixgb_hw *hw = &adapter->hw;
1741         u32 icr = IXGB_READ_REG(hw, ICR);
1742
1743         if (unlikely(!icr))
1744                 return IRQ_NONE;  /* Not our interrupt */
1745
1746         if (unlikely(icr & (IXGB_INT_RXSEQ | IXGB_INT_LSC)))
1747                 if (!test_bit(__IXGB_DOWN, &adapter->flags))
1748                         mod_timer(&adapter->watchdog_timer, jiffies);
1749
1750         if (napi_schedule_prep(&adapter->napi)) {
1751
1752                 /* Disable interrupts and register for poll. The flush
1753                   of the posted write is intentionally left out.
1754                 */
1755
1756                 IXGB_WRITE_REG(&adapter->hw, IMC, ~0);
1757                 __napi_schedule(&adapter->napi);
1758         }
1759         return IRQ_HANDLED;
1760 }
1761
1762 /**
1763  * ixgb_clean - NAPI Rx polling callback
1764  * @adapter: board private structure
1765  **/
1766
1767 static int
1768 ixgb_clean(struct napi_struct *napi, int budget)
1769 {
1770         struct ixgb_adapter *adapter = container_of(napi, struct ixgb_adapter, napi);
1771         int work_done = 0;
1772
1773         ixgb_clean_tx_irq(adapter);
1774         ixgb_clean_rx_irq(adapter, &work_done, budget);
1775
1776         /* If budget not fully consumed, exit the polling mode */
1777         if (work_done < budget) {
1778                 napi_complete_done(napi, work_done);
1779                 if (!test_bit(__IXGB_DOWN, &adapter->flags))
1780                         ixgb_irq_enable(adapter);
1781         }
1782
1783         return work_done;
1784 }
1785
1786 /**
1787  * ixgb_clean_tx_irq - Reclaim resources after transmit completes
1788  * @adapter: board private structure
1789  **/
1790
1791 static bool
1792 ixgb_clean_tx_irq(struct ixgb_adapter *adapter)
1793 {
1794         struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
1795         struct net_device *netdev = adapter->netdev;
1796         struct ixgb_tx_desc *tx_desc, *eop_desc;
1797         struct ixgb_buffer *buffer_info;
1798         unsigned int i, eop;
1799         bool cleaned = false;
1800
1801         i = tx_ring->next_to_clean;
1802         eop = tx_ring->buffer_info[i].next_to_watch;
1803         eop_desc = IXGB_TX_DESC(*tx_ring, eop);
1804
1805         while (eop_desc->status & IXGB_TX_DESC_STATUS_DD) {
1806
1807                 rmb(); /* read buffer_info after eop_desc */
1808                 for (cleaned = false; !cleaned; ) {
1809                         tx_desc = IXGB_TX_DESC(*tx_ring, i);
1810                         buffer_info = &tx_ring->buffer_info[i];
1811
1812                         if (tx_desc->popts &
1813                            (IXGB_TX_DESC_POPTS_TXSM |
1814                             IXGB_TX_DESC_POPTS_IXSM))
1815                                 adapter->hw_csum_tx_good++;
1816
1817                         ixgb_unmap_and_free_tx_resource(adapter, buffer_info);
1818
1819                         *(u32 *)&(tx_desc->status) = 0;
1820
1821                         cleaned = (i == eop);
1822                         if (++i == tx_ring->count) i = 0;
1823                 }
1824
1825                 eop = tx_ring->buffer_info[i].next_to_watch;
1826                 eop_desc = IXGB_TX_DESC(*tx_ring, eop);
1827         }
1828
1829         tx_ring->next_to_clean = i;
1830
1831         if (unlikely(cleaned && netif_carrier_ok(netdev) &&
1832                      IXGB_DESC_UNUSED(tx_ring) >= DESC_NEEDED)) {
1833                 /* Make sure that anybody stopping the queue after this
1834                  * sees the new next_to_clean. */
1835                 smp_mb();
1836
1837                 if (netif_queue_stopped(netdev) &&
1838                     !(test_bit(__IXGB_DOWN, &adapter->flags))) {
1839                         netif_wake_queue(netdev);
1840                         ++adapter->restart_queue;
1841                 }
1842         }
1843
1844         if (adapter->detect_tx_hung) {
1845                 /* detect a transmit hang in hardware, this serializes the
1846                  * check with the clearing of time_stamp and movement of i */
1847                 adapter->detect_tx_hung = false;
1848                 if (tx_ring->buffer_info[eop].time_stamp &&
1849                    time_after(jiffies, tx_ring->buffer_info[eop].time_stamp + HZ)
1850                    && !(IXGB_READ_REG(&adapter->hw, STATUS) &
1851                         IXGB_STATUS_TXOFF)) {
1852                         /* detected Tx unit hang */
1853                         netif_err(adapter, drv, adapter->netdev,
1854                                   "Detected Tx Unit Hang\n"
1855                                   "  TDH                  <%x>\n"
1856                                   "  TDT                  <%x>\n"
1857                                   "  next_to_use          <%x>\n"
1858                                   "  next_to_clean        <%x>\n"
1859                                   "buffer_info[next_to_clean]\n"
1860                                   "  time_stamp           <%lx>\n"
1861                                   "  next_to_watch        <%x>\n"
1862                                   "  jiffies              <%lx>\n"
1863                                   "  next_to_watch.status <%x>\n",
1864                                   IXGB_READ_REG(&adapter->hw, TDH),
1865                                   IXGB_READ_REG(&adapter->hw, TDT),
1866                                   tx_ring->next_to_use,
1867                                   tx_ring->next_to_clean,
1868                                   tx_ring->buffer_info[eop].time_stamp,
1869                                   eop,
1870                                   jiffies,
1871                                   eop_desc->status);
1872                         netif_stop_queue(netdev);
1873                 }
1874         }
1875
1876         return cleaned;
1877 }
1878
1879 /**
1880  * ixgb_rx_checksum - Receive Checksum Offload for 82597.
1881  * @adapter: board private structure
1882  * @rx_desc: receive descriptor
1883  * @sk_buff: socket buffer with received data
1884  **/
1885
1886 static void
1887 ixgb_rx_checksum(struct ixgb_adapter *adapter,
1888                  struct ixgb_rx_desc *rx_desc,
1889                  struct sk_buff *skb)
1890 {
1891         /* Ignore Checksum bit is set OR
1892          * TCP Checksum has not been calculated
1893          */
1894         if ((rx_desc->status & IXGB_RX_DESC_STATUS_IXSM) ||
1895            (!(rx_desc->status & IXGB_RX_DESC_STATUS_TCPCS))) {
1896                 skb_checksum_none_assert(skb);
1897                 return;
1898         }
1899
1900         /* At this point we know the hardware did the TCP checksum */
1901         /* now look at the TCP checksum error bit */
1902         if (rx_desc->errors & IXGB_RX_DESC_ERRORS_TCPE) {
1903                 /* let the stack verify checksum errors */
1904                 skb_checksum_none_assert(skb);
1905                 adapter->hw_csum_rx_error++;
1906         } else {
1907                 /* TCP checksum is good */
1908                 skb->ip_summed = CHECKSUM_UNNECESSARY;
1909                 adapter->hw_csum_rx_good++;
1910         }
1911 }
1912
1913 /*
1914  * this should improve performance for small packets with large amounts
1915  * of reassembly being done in the stack
1916  */
1917 static void ixgb_check_copybreak(struct napi_struct *napi,
1918                                  struct ixgb_buffer *buffer_info,
1919                                  u32 length, struct sk_buff **skb)
1920 {
1921         struct sk_buff *new_skb;
1922
1923         if (length > copybreak)
1924                 return;
1925
1926         new_skb = napi_alloc_skb(napi, length);
1927         if (!new_skb)
1928                 return;
1929
1930         skb_copy_to_linear_data_offset(new_skb, -NET_IP_ALIGN,
1931                                        (*skb)->data - NET_IP_ALIGN,
1932                                        length + NET_IP_ALIGN);
1933         /* save the skb in buffer_info as good */
1934         buffer_info->skb = *skb;
1935         *skb = new_skb;
1936 }
1937
1938 /**
1939  * ixgb_clean_rx_irq - Send received data up the network stack,
1940  * @adapter: board private structure
1941  **/
1942
1943 static bool
1944 ixgb_clean_rx_irq(struct ixgb_adapter *adapter, int *work_done, int work_to_do)
1945 {
1946         struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
1947         struct net_device *netdev = adapter->netdev;
1948         struct pci_dev *pdev = adapter->pdev;
1949         struct ixgb_rx_desc *rx_desc, *next_rxd;
1950         struct ixgb_buffer *buffer_info, *next_buffer, *next2_buffer;
1951         u32 length;
1952         unsigned int i, j;
1953         int cleaned_count = 0;
1954         bool cleaned = false;
1955
1956         i = rx_ring->next_to_clean;
1957         rx_desc = IXGB_RX_DESC(*rx_ring, i);
1958         buffer_info = &rx_ring->buffer_info[i];
1959
1960         while (rx_desc->status & IXGB_RX_DESC_STATUS_DD) {
1961                 struct sk_buff *skb;
1962                 u8 status;
1963
1964                 if (*work_done >= work_to_do)
1965                         break;
1966
1967                 (*work_done)++;
1968                 rmb();  /* read descriptor and rx_buffer_info after status DD */
1969                 status = rx_desc->status;
1970                 skb = buffer_info->skb;
1971                 buffer_info->skb = NULL;
1972
1973                 prefetch(skb->data - NET_IP_ALIGN);
1974
1975                 if (++i == rx_ring->count)
1976                         i = 0;
1977                 next_rxd = IXGB_RX_DESC(*rx_ring, i);
1978                 prefetch(next_rxd);
1979
1980                 j = i + 1;
1981                 if (j == rx_ring->count)
1982                         j = 0;
1983                 next2_buffer = &rx_ring->buffer_info[j];
1984                 prefetch(next2_buffer);
1985
1986                 next_buffer = &rx_ring->buffer_info[i];
1987
1988                 cleaned = true;
1989                 cleaned_count++;
1990
1991                 dma_unmap_single(&pdev->dev,
1992                                  buffer_info->dma,
1993                                  buffer_info->length,
1994                                  DMA_FROM_DEVICE);
1995                 buffer_info->dma = 0;
1996
1997                 length = le16_to_cpu(rx_desc->length);
1998                 rx_desc->length = 0;
1999
2000                 if (unlikely(!(status & IXGB_RX_DESC_STATUS_EOP))) {
2001
2002                         /* All receives must fit into a single buffer */
2003
2004                         pr_debug("Receive packet consumed multiple buffers length<%x>\n",
2005                                  length);
2006
2007                         dev_kfree_skb_irq(skb);
2008                         goto rxdesc_done;
2009                 }
2010
2011                 if (unlikely(rx_desc->errors &
2012                     (IXGB_RX_DESC_ERRORS_CE | IXGB_RX_DESC_ERRORS_SE |
2013                      IXGB_RX_DESC_ERRORS_P | IXGB_RX_DESC_ERRORS_RXE))) {
2014                         dev_kfree_skb_irq(skb);
2015                         goto rxdesc_done;
2016                 }
2017
2018                 ixgb_check_copybreak(&adapter->napi, buffer_info, length, &skb);
2019
2020                 /* Good Receive */
2021                 skb_put(skb, length);
2022
2023                 /* Receive Checksum Offload */
2024                 ixgb_rx_checksum(adapter, rx_desc, skb);
2025
2026                 skb->protocol = eth_type_trans(skb, netdev);
2027                 if (status & IXGB_RX_DESC_STATUS_VP)
2028                         __vlan_hwaccel_put_tag(skb, htons(ETH_P_8021Q),
2029                                        le16_to_cpu(rx_desc->special));
2030
2031                 netif_receive_skb(skb);
2032
2033 rxdesc_done:
2034                 /* clean up descriptor, might be written over by hw */
2035                 rx_desc->status = 0;
2036
2037                 /* return some buffers to hardware, one at a time is too slow */
2038                 if (unlikely(cleaned_count >= IXGB_RX_BUFFER_WRITE)) {
2039                         ixgb_alloc_rx_buffers(adapter, cleaned_count);
2040                         cleaned_count = 0;
2041                 }
2042
2043                 /* use prefetched values */
2044                 rx_desc = next_rxd;
2045                 buffer_info = next_buffer;
2046         }
2047
2048         rx_ring->next_to_clean = i;
2049
2050         cleaned_count = IXGB_DESC_UNUSED(rx_ring);
2051         if (cleaned_count)
2052                 ixgb_alloc_rx_buffers(adapter, cleaned_count);
2053
2054         return cleaned;
2055 }
2056
2057 /**
2058  * ixgb_alloc_rx_buffers - Replace used receive buffers
2059  * @adapter: address of board private structure
2060  **/
2061
2062 static void
2063 ixgb_alloc_rx_buffers(struct ixgb_adapter *adapter, int cleaned_count)
2064 {
2065         struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
2066         struct net_device *netdev = adapter->netdev;
2067         struct pci_dev *pdev = adapter->pdev;
2068         struct ixgb_rx_desc *rx_desc;
2069         struct ixgb_buffer *buffer_info;
2070         struct sk_buff *skb;
2071         unsigned int i;
2072         long cleancount;
2073
2074         i = rx_ring->next_to_use;
2075         buffer_info = &rx_ring->buffer_info[i];
2076         cleancount = IXGB_DESC_UNUSED(rx_ring);
2077
2078
2079         /* leave three descriptors unused */
2080         while (--cleancount > 2 && cleaned_count--) {
2081                 /* recycle! its good for you */
2082                 skb = buffer_info->skb;
2083                 if (skb) {
2084                         skb_trim(skb, 0);
2085                         goto map_skb;
2086                 }
2087
2088                 skb = netdev_alloc_skb_ip_align(netdev, adapter->rx_buffer_len);
2089                 if (unlikely(!skb)) {
2090                         /* Better luck next round */
2091                         adapter->alloc_rx_buff_failed++;
2092                         break;
2093                 }
2094
2095                 buffer_info->skb = skb;
2096                 buffer_info->length = adapter->rx_buffer_len;
2097 map_skb:
2098                 buffer_info->dma = dma_map_single(&pdev->dev,
2099                                                   skb->data,
2100                                                   adapter->rx_buffer_len,
2101                                                   DMA_FROM_DEVICE);
2102                 if (dma_mapping_error(&pdev->dev, buffer_info->dma)) {
2103                         adapter->alloc_rx_buff_failed++;
2104                         break;
2105                 }
2106
2107                 rx_desc = IXGB_RX_DESC(*rx_ring, i);
2108                 rx_desc->buff_addr = cpu_to_le64(buffer_info->dma);
2109                 /* guarantee DD bit not set now before h/w gets descriptor
2110                  * this is the rest of the workaround for h/w double
2111                  * writeback. */
2112                 rx_desc->status = 0;
2113
2114
2115                 if (++i == rx_ring->count)
2116                         i = 0;
2117                 buffer_info = &rx_ring->buffer_info[i];
2118         }
2119
2120         if (likely(rx_ring->next_to_use != i)) {
2121                 rx_ring->next_to_use = i;
2122                 if (unlikely(i-- == 0))
2123                         i = (rx_ring->count - 1);
2124
2125                 /* Force memory writes to complete before letting h/w
2126                  * know there are new descriptors to fetch.  (Only
2127                  * applicable for weak-ordered memory model archs, such
2128                  * as IA-64). */
2129                 wmb();
2130                 IXGB_WRITE_REG(&adapter->hw, RDT, i);
2131         }
2132 }
2133
2134 static void
2135 ixgb_vlan_strip_enable(struct ixgb_adapter *adapter)
2136 {
2137         u32 ctrl;
2138
2139         /* enable 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 void
2146 ixgb_vlan_strip_disable(struct ixgb_adapter *adapter)
2147 {
2148         u32 ctrl;
2149
2150         /* disable VLAN tag insert/strip */
2151         ctrl = IXGB_READ_REG(&adapter->hw, CTRL0);
2152         ctrl &= ~IXGB_CTRL0_VME;
2153         IXGB_WRITE_REG(&adapter->hw, CTRL0, ctrl);
2154 }
2155
2156 static int
2157 ixgb_vlan_rx_add_vid(struct net_device *netdev, __be16 proto, u16 vid)
2158 {
2159         struct ixgb_adapter *adapter = netdev_priv(netdev);
2160         u32 vfta, index;
2161
2162         /* add VID to filter table */
2163
2164         index = (vid >> 5) & 0x7F;
2165         vfta = IXGB_READ_REG_ARRAY(&adapter->hw, VFTA, index);
2166         vfta |= (1 << (vid & 0x1F));
2167         ixgb_write_vfta(&adapter->hw, index, vfta);
2168         set_bit(vid, adapter->active_vlans);
2169
2170         return 0;
2171 }
2172
2173 static int
2174 ixgb_vlan_rx_kill_vid(struct net_device *netdev, __be16 proto, u16 vid)
2175 {
2176         struct ixgb_adapter *adapter = netdev_priv(netdev);
2177         u32 vfta, index;
2178
2179         /* remove VID from filter table */
2180
2181         index = (vid >> 5) & 0x7F;
2182         vfta = IXGB_READ_REG_ARRAY(&adapter->hw, VFTA, index);
2183         vfta &= ~(1 << (vid & 0x1F));
2184         ixgb_write_vfta(&adapter->hw, index, vfta);
2185         clear_bit(vid, adapter->active_vlans);
2186
2187         return 0;
2188 }
2189
2190 static void
2191 ixgb_restore_vlan(struct ixgb_adapter *adapter)
2192 {
2193         u16 vid;
2194
2195         for_each_set_bit(vid, adapter->active_vlans, VLAN_N_VID)
2196                 ixgb_vlan_rx_add_vid(adapter->netdev, htons(ETH_P_8021Q), vid);
2197 }
2198
2199 #ifdef CONFIG_NET_POLL_CONTROLLER
2200 /*
2201  * Polling 'interrupt' - used by things like netconsole to send skbs
2202  * without having to re-enable interrupts. It's not called while
2203  * the interrupt routine is executing.
2204  */
2205
2206 static void ixgb_netpoll(struct net_device *dev)
2207 {
2208         struct ixgb_adapter *adapter = netdev_priv(dev);
2209
2210         disable_irq(adapter->pdev->irq);
2211         ixgb_intr(adapter->pdev->irq, dev);
2212         enable_irq(adapter->pdev->irq);
2213 }
2214 #endif
2215
2216 /**
2217  * ixgb_io_error_detected - called when PCI error is detected
2218  * @pdev:    pointer to pci device with error
2219  * @state:   pci channel state after error
2220  *
2221  * This callback is called by the PCI subsystem whenever
2222  * a PCI bus error is detected.
2223  */
2224 static pci_ers_result_t ixgb_io_error_detected(struct pci_dev *pdev,
2225                                                enum pci_channel_state state)
2226 {
2227         struct net_device *netdev = pci_get_drvdata(pdev);
2228         struct ixgb_adapter *adapter = netdev_priv(netdev);
2229
2230         netif_device_detach(netdev);
2231
2232         if (state == pci_channel_io_perm_failure)
2233                 return PCI_ERS_RESULT_DISCONNECT;
2234
2235         if (netif_running(netdev))
2236                 ixgb_down(adapter, true);
2237
2238         pci_disable_device(pdev);
2239
2240         /* Request a slot reset. */
2241         return PCI_ERS_RESULT_NEED_RESET;
2242 }
2243
2244 /**
2245  * ixgb_io_slot_reset - called after the pci bus has been reset.
2246  * @pdev    pointer to pci device with error
2247  *
2248  * This callback is called after the PCI bus has been reset.
2249  * Basically, this tries to restart the card from scratch.
2250  * This is a shortened version of the device probe/discovery code,
2251  * it resembles the first-half of the ixgb_probe() routine.
2252  */
2253 static pci_ers_result_t ixgb_io_slot_reset(struct pci_dev *pdev)
2254 {
2255         struct net_device *netdev = pci_get_drvdata(pdev);
2256         struct ixgb_adapter *adapter = netdev_priv(netdev);
2257
2258         if (pci_enable_device(pdev)) {
2259                 netif_err(adapter, probe, adapter->netdev,
2260                           "Cannot re-enable PCI device after reset\n");
2261                 return PCI_ERS_RESULT_DISCONNECT;
2262         }
2263
2264         /* Perform card reset only on one instance of the card */
2265         if (0 != PCI_FUNC (pdev->devfn))
2266                 return PCI_ERS_RESULT_RECOVERED;
2267
2268         pci_set_master(pdev);
2269
2270         netif_carrier_off(netdev);
2271         netif_stop_queue(netdev);
2272         ixgb_reset(adapter);
2273
2274         /* Make sure the EEPROM is good */
2275         if (!ixgb_validate_eeprom_checksum(&adapter->hw)) {
2276                 netif_err(adapter, probe, adapter->netdev,
2277                           "After reset, the EEPROM checksum is not valid\n");
2278                 return PCI_ERS_RESULT_DISCONNECT;
2279         }
2280         ixgb_get_ee_mac_addr(&adapter->hw, netdev->dev_addr);
2281         memcpy(netdev->perm_addr, netdev->dev_addr, netdev->addr_len);
2282
2283         if (!is_valid_ether_addr(netdev->perm_addr)) {
2284                 netif_err(adapter, probe, adapter->netdev,
2285                           "After reset, invalid MAC address\n");
2286                 return PCI_ERS_RESULT_DISCONNECT;
2287         }
2288
2289         return PCI_ERS_RESULT_RECOVERED;
2290 }
2291
2292 /**
2293  * ixgb_io_resume - called when its OK to resume normal operations
2294  * @pdev    pointer to pci device with error
2295  *
2296  * The error recovery driver tells us that its OK to resume
2297  * normal operation. Implementation resembles the second-half
2298  * of the ixgb_probe() routine.
2299  */
2300 static void ixgb_io_resume(struct pci_dev *pdev)
2301 {
2302         struct net_device *netdev = pci_get_drvdata(pdev);
2303         struct ixgb_adapter *adapter = netdev_priv(netdev);
2304
2305         pci_set_master(pdev);
2306
2307         if (netif_running(netdev)) {
2308                 if (ixgb_up(adapter)) {
2309                         pr_err("can't bring device back up after reset\n");
2310                         return;
2311                 }
2312         }
2313
2314         netif_device_attach(netdev);
2315         mod_timer(&adapter->watchdog_timer, jiffies);
2316 }
2317
2318 /* ixgb_main.c */