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 static const char ixgb_copyright[] = "Copyright (c) 1999-2008 Intel Corporation.";
  13
  14 #define IXGB_CB_LENGTH 256
  15 static unsigned int copybreak __read_mostly = IXGB_CB_LENGTH;
  16 module_param(copybreak, uint, 0644);
  17 MODULE_PARM_DESC(copybreak,
  18         "Maximum size of packet that is copied to a new buffer on receive");
  19
  20 /* ixgb_pci_tbl - PCI Device ID Table
  21  *
  22  * Wildcard entries (PCI_ANY_ID) should come last
  23  * Last entry must be all 0s
  24  *
  25  * { Vendor ID, Device ID, SubVendor ID, SubDevice ID,
  26  *   Class, Class Mask, private data (not used) }
  27  */
  28 static const struct pci_device_id ixgb_pci_tbl[] = {
  29         {PCI_VENDOR_ID_INTEL, IXGB_DEVICE_ID_82597EX,
  30          PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
  31         {PCI_VENDOR_ID_INTEL, IXGB_DEVICE_ID_82597EX_CX4,
  32          PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
  33         {PCI_VENDOR_ID_INTEL, IXGB_DEVICE_ID_82597EX_SR,
  34          PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
  35         {PCI_VENDOR_ID_INTEL, IXGB_DEVICE_ID_82597EX_LR,
  36          PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
  37
  38         /* required last entry */
  39         {0,}
  40 };
  41
  42 MODULE_DEVICE_TABLE(pci, ixgb_pci_tbl);
  43
  44 /* Local Function Prototypes */
  45 static int ixgb_init_module(void);
  46 static void ixgb_exit_module(void);
  47 static int ixgb_probe(struct pci_dev *pdev, const struct pci_device_id *ent);
  48 static void ixgb_remove(struct pci_dev *pdev);
  49 static int ixgb_sw_init(struct ixgb_adapter *adapter);
  50 static int ixgb_open(struct net_device *netdev);
  51 static int ixgb_close(struct net_device *netdev);
  52 static void ixgb_configure_tx(struct ixgb_adapter *adapter);
  53 static void ixgb_configure_rx(struct ixgb_adapter *adapter);
  54 static void ixgb_setup_rctl(struct ixgb_adapter *adapter);
  55 static void ixgb_clean_tx_ring(struct ixgb_adapter *adapter);
  56 static void ixgb_clean_rx_ring(struct ixgb_adapter *adapter);
  57 static void ixgb_set_multi(struct net_device *netdev);
  58 static void ixgb_watchdog(struct timer_list *t);
  59 static netdev_tx_t ixgb_xmit_frame(struct sk_buff *skb,
  60                                    struct net_device *netdev);
  61 static int ixgb_change_mtu(struct net_device *netdev, int new_mtu);
  62 static int ixgb_set_mac(struct net_device *netdev, void *p);
  63 static irqreturn_t ixgb_intr(int irq, void *data);
  64 static bool ixgb_clean_tx_irq(struct ixgb_adapter *adapter);
  65
  66 static int ixgb_clean(struct napi_struct *, int);
  67 static bool ixgb_clean_rx_irq(struct ixgb_adapter *, int *, int);
  68 static void ixgb_alloc_rx_buffers(struct ixgb_adapter *, int);
  69
  70 static void ixgb_tx_timeout(struct net_device *dev, unsigned int txqueue);
  71 static void ixgb_tx_timeout_task(struct work_struct *work);
  72
  73 static void ixgb_vlan_strip_enable(struct ixgb_adapter *adapter);
  74 static void ixgb_vlan_strip_disable(struct ixgb_adapter *adapter);
  75 static int ixgb_vlan_rx_add_vid(struct net_device *netdev,
  76                                 __be16 proto, u16 vid);
  77 static int ixgb_vlan_rx_kill_vid(struct net_device *netdev,
  78                                  __be16 proto, u16 vid);
  79 static void ixgb_restore_vlan(struct ixgb_adapter *adapter);
  80
  81 static pci_ers_result_t ixgb_io_error_detected (struct pci_dev *pdev,
  82                              enum pci_channel_state state);
  83 static pci_ers_result_t ixgb_io_slot_reset (struct pci_dev *pdev);
  84 static void ixgb_io_resume (struct pci_dev *pdev);
  85
  86 static const struct pci_error_handlers ixgb_err_handler = {
  87         .error_detected = ixgb_io_error_detected,
  88         .slot_reset = ixgb_io_slot_reset,
  89         .resume = ixgb_io_resume,
  90 };
  91
  92 static struct pci_driver ixgb_driver = {
  93         .name     = ixgb_driver_name,
  94         .id_table = ixgb_pci_tbl,
  95         .probe    = ixgb_probe,
  96         .remove   = ixgb_remove,
  97         .err_handler = &ixgb_err_handler
  98 };
  99
 100 MODULE_AUTHOR("Intel Corporation, <linux.nics@intel.com>");
 101 MODULE_DESCRIPTION("Intel(R) PRO/10GbE Network Driver");
 102 MODULE_LICENSE("GPL v2");
 103
 104 #define DEFAULT_MSG_ENABLE (NETIF_MSG_DRV|NETIF_MSG_PROBE|NETIF_MSG_LINK)
 105 static int debug = -1;
 106 module_param(debug, int, 0);
 107 MODULE_PARM_DESC(debug, "Debug level (0=none,...,16=all)");
 108
 109 /**
 110  * ixgb_init_module - Driver Registration Routine
 111  *
 112  * ixgb_init_module is the first routine called when the driver is
 113  * loaded. All it does is register with the PCI subsystem.
 114  **/
 115
 116 static int __init
 117 ixgb_init_module(void)
 118 {
 119         pr_info("%s\n", ixgb_driver_string);
 120         pr_info("%s\n", ixgb_copyright);
 121
 122         return pci_register_driver(&ixgb_driver);
 123 }
 124
 125 module_init(ixgb_init_module);
 126
 127 /**
 128  * ixgb_exit_module - Driver Exit Cleanup Routine
 129  *
 130  * ixgb_exit_module is called just before the driver is removed
 131  * from memory.
 132  **/
 133
 134 static void __exit
 135 ixgb_exit_module(void)
 136 {
 137         pci_unregister_driver(&ixgb_driver);
 138 }
 139
 140 module_exit(ixgb_exit_module);
 141
 142 /**
 143  * ixgb_irq_disable - Mask off interrupt generation on the NIC
 144  * @adapter: board private structure
 145  **/
 146
 147 static void
 148 ixgb_irq_disable(struct ixgb_adapter *adapter)
 149 {
 150         IXGB_WRITE_REG(&adapter->hw, IMC, ~0);
 151         IXGB_WRITE_FLUSH(&adapter->hw);
 152         synchronize_irq(adapter->pdev->irq);
 153 }
 154
 155 /**
 156  * ixgb_irq_enable - Enable default interrupt generation settings
 157  * @adapter: board private structure
 158  **/
 159
 160 static void
 161 ixgb_irq_enable(struct ixgb_adapter *adapter)
 162 {
 163         u32 val = IXGB_INT_RXT0 | IXGB_INT_RXDMT0 |
 164                   IXGB_INT_TXDW | IXGB_INT_LSC;
 165         if (adapter->hw.subsystem_vendor_id == PCI_VENDOR_ID_SUN)
 166                 val |= IXGB_INT_GPI0;
 167         IXGB_WRITE_REG(&adapter->hw, IMS, val);
 168         IXGB_WRITE_FLUSH(&adapter->hw);
 169 }
 170
 171 int
 172 ixgb_up(struct ixgb_adapter *adapter)
 173 {
 174         struct net_device *netdev = adapter->netdev;
 175         int err, irq_flags = IRQF_SHARED;
 176         int max_frame = netdev->mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;
 177         struct ixgb_hw *hw = &adapter->hw;
 178
 179         /* hardware has been reset, we need to reload some things */
 180
 181         ixgb_rar_set(hw, netdev->dev_addr, 0);
 182         ixgb_set_multi(netdev);
 183
 184         ixgb_restore_vlan(adapter);
 185
 186         ixgb_configure_tx(adapter);
 187         ixgb_setup_rctl(adapter);
 188         ixgb_configure_rx(adapter);
 189         ixgb_alloc_rx_buffers(adapter, IXGB_DESC_UNUSED(&adapter->rx_ring));
 190
 191         /* disable interrupts and get the hardware into a known state */
 192         IXGB_WRITE_REG(&adapter->hw, IMC, 0xffffffff);
 193
 194         /* only enable MSI if bus is in PCI-X mode */
 195         if (IXGB_READ_REG(&adapter->hw, STATUS) & IXGB_STATUS_PCIX_MODE) {
 196                 err = pci_enable_msi(adapter->pdev);
 197                 if (!err) {
 198                         adapter->have_msi = true;
 199                         irq_flags = 0;
 200                 }
 201                 /* proceed to try to request regular interrupt */
 202         }
 203
 204         err = request_irq(adapter->pdev->irq, ixgb_intr, irq_flags,
 205                           netdev->name, netdev);
 206         if (err) {
 207                 if (adapter->have_msi)
 208                         pci_disable_msi(adapter->pdev);
 209                 netif_err(adapter, probe, adapter->netdev,
 210                           "Unable to allocate interrupt Error: %d\n", err);
 211                 return err;
 212         }
 213
 214         if ((hw->max_frame_size != max_frame) ||
 215                 (hw->max_frame_size !=
 216                 (IXGB_READ_REG(hw, MFS) >> IXGB_MFS_SHIFT))) {
 217
 218                 hw->max_frame_size = max_frame;
 219
 220                 IXGB_WRITE_REG(hw, MFS, hw->max_frame_size << IXGB_MFS_SHIFT);
 221
 222                 if (hw->max_frame_size >
 223                    IXGB_MAX_ENET_FRAME_SIZE_WITHOUT_FCS + ENET_FCS_LENGTH) {
 224                         u32 ctrl0 = IXGB_READ_REG(hw, CTRL0);
 225
 226                         if (!(ctrl0 & IXGB_CTRL0_JFE)) {
 227                                 ctrl0 |= IXGB_CTRL0_JFE;
 228                                 IXGB_WRITE_REG(hw, CTRL0, ctrl0);
 229                         }
 230                 }
 231         }
 232
 233         clear_bit(__IXGB_DOWN, &adapter->flags);
 234
 235         napi_enable(&adapter->napi);
 236         ixgb_irq_enable(adapter);
 237
 238         netif_wake_queue(netdev);
 239
 240         mod_timer(&adapter->watchdog_timer, jiffies);
 241
 242         return 0;
 243 }
 244
 245 void
 246 ixgb_down(struct ixgb_adapter *adapter, bool kill_watchdog)
 247 {
 248         struct net_device *netdev = adapter->netdev;
 249
 250         /* prevent the interrupt handler from restarting watchdog */
 251         set_bit(__IXGB_DOWN, &adapter->flags);
 252
 253         netif_carrier_off(netdev);
 254
 255         napi_disable(&adapter->napi);
 256         /* waiting for NAPI to complete can re-enable interrupts */
 257         ixgb_irq_disable(adapter);
 258         free_irq(adapter->pdev->irq, netdev);
 259
 260         if (adapter->have_msi)
 261                 pci_disable_msi(adapter->pdev);
 262
 263         if (kill_watchdog)
 264                 del_timer_sync(&adapter->watchdog_timer);
 265
 266         adapter->link_speed = 0;
 267         adapter->link_duplex = 0;
 268         netif_stop_queue(netdev);
 269
 270         ixgb_reset(adapter);
 271         ixgb_clean_tx_ring(adapter);
 272         ixgb_clean_rx_ring(adapter);
 273 }
 274
 275 void
 276 ixgb_reset(struct ixgb_adapter *adapter)
 277 {
 278         struct ixgb_hw *hw = &adapter->hw;
 279
 280         ixgb_adapter_stop(hw);
 281         if (!ixgb_init_hw(hw))
 282                 netif_err(adapter, probe, adapter->netdev, "ixgb_init_hw failed\n");
 283
 284         /* restore frame size information */
 285         IXGB_WRITE_REG(hw, MFS, hw->max_frame_size << IXGB_MFS_SHIFT);
 286         if (hw->max_frame_size >
 287             IXGB_MAX_ENET_FRAME_SIZE_WITHOUT_FCS + ENET_FCS_LENGTH) {
 288                 u32 ctrl0 = IXGB_READ_REG(hw, CTRL0);
 289                 if (!(ctrl0 & IXGB_CTRL0_JFE)) {
 290                         ctrl0 |= IXGB_CTRL0_JFE;
 291                         IXGB_WRITE_REG(hw, CTRL0, ctrl0);
 292                 }
 293         }
 294 }
 295
 296 static netdev_features_t
 297 ixgb_fix_features(struct net_device *netdev, netdev_features_t features)
 298 {
 299         /*
 300          * Tx VLAN insertion does not work per HW design when Rx stripping is
 301          * disabled.
 302          */
 303         if (!(features & NETIF_F_HW_VLAN_CTAG_RX))
 304                 features &= ~NETIF_F_HW_VLAN_CTAG_TX;
 305
 306         return features;
 307 }
 308
 309 static int
 310 ixgb_set_features(struct net_device *netdev, netdev_features_t features)
 311 {
 312         struct ixgb_adapter *adapter = netdev_priv(netdev);
 313         netdev_features_t changed = features ^ netdev->features;
 314
 315         if (!(changed & (NETIF_F_RXCSUM|NETIF_F_HW_VLAN_CTAG_RX)))
 316                 return 0;
 317
 318         adapter->rx_csum = !!(features & NETIF_F_RXCSUM);
 319
 320         if (netif_running(netdev)) {
 321                 ixgb_down(adapter, true);
 322                 ixgb_up(adapter);
 323                 ixgb_set_speed_duplex(netdev);
 324         } else
 325                 ixgb_reset(adapter);
 326
 327         return 0;
 328 }
 329
 330
 331 static const struct net_device_ops ixgb_netdev_ops = {
 332         .ndo_open               = ixgb_open,
 333         .ndo_stop               = ixgb_close,
 334         .ndo_start_xmit         = ixgb_xmit_frame,
 335         .ndo_set_rx_mode        = ixgb_set_multi,
 336         .ndo_validate_addr      = eth_validate_addr,
 337         .ndo_set_mac_address    = ixgb_set_mac,
 338         .ndo_change_mtu         = ixgb_change_mtu,
 339         .ndo_tx_timeout         = ixgb_tx_timeout,
 340         .ndo_vlan_rx_add_vid    = ixgb_vlan_rx_add_vid,
 341         .ndo_vlan_rx_kill_vid   = ixgb_vlan_rx_kill_vid,
 342         .ndo_fix_features       = ixgb_fix_features,
 343         .ndo_set_features       = ixgb_set_features,
 344 };
 345
 346 /**
 347  * ixgb_probe - Device Initialization Routine
 348  * @pdev: PCI device information struct
 349  * @ent: entry in ixgb_pci_tbl
 350  *
 351  * Returns 0 on success, negative on failure
 352  *
 353  * ixgb_probe initializes an adapter identified by a pci_dev structure.
 354  * The OS initialization, configuring of the adapter private structure,
 355  * and a hardware reset occur.
 356  **/
 357
 358 static int
 359 ixgb_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
 360 {
 361         struct net_device *netdev = NULL;
 362         struct ixgb_adapter *adapter;
 363         static int cards_found = 0;
 364         int pci_using_dac;
 365         int i;
 366         int err;
 367
 368         err = pci_enable_device(pdev);
 369         if (err)
 370                 return err;
 371
 372         pci_using_dac = 0;
 373         err = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(64));
 374         if (!err) {
 375                 pci_using_dac = 1;
 376         } else {
 377                 err = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32));
 378                 if (err) {
 379                         pr_err("No usable DMA configuration, aborting\n");
 380                         goto err_dma_mask;
 381                 }
 382         }
 383
 384         err = pci_request_regions(pdev, ixgb_driver_name);
 385         if (err)
 386                 goto err_request_regions;
 387
 388         pci_set_master(pdev);
 389
 390         netdev = alloc_etherdev(sizeof(struct ixgb_adapter));
 391         if (!netdev) {
 392                 err = -ENOMEM;
 393                 goto err_alloc_etherdev;
 394         }
 395
 396         SET_NETDEV_DEV(netdev, &pdev->dev);
 397
 398         pci_set_drvdata(pdev, netdev);
 399         adapter = netdev_priv(netdev);
 400         adapter->netdev = netdev;
 401         adapter->pdev = pdev;
 402         adapter->hw.back = adapter;
 403         adapter->msg_enable = netif_msg_init(debug, DEFAULT_MSG_ENABLE);
 404
 405         adapter->hw.hw_addr = pci_ioremap_bar(pdev, BAR_0);
 406         if (!adapter->hw.hw_addr) {
 407                 err = -EIO;
 408                 goto err_ioremap;
 409         }
 410
 411         for (i = BAR_1; i < PCI_STD_NUM_BARS; i++) {
 412                 if (pci_resource_len(pdev, i) == 0)
 413                         continue;
 414                 if (pci_resource_flags(pdev, i) & IORESOURCE_IO) {
 415                         adapter->hw.io_base = pci_resource_start(pdev, i);
 416                         break;
 417                 }
 418         }
 419
 420         netdev->netdev_ops = &ixgb_netdev_ops;
 421         ixgb_set_ethtool_ops(netdev);
 422         netdev->watchdog_timeo = 5 * HZ;
 423         netif_napi_add(netdev, &adapter->napi, ixgb_clean, 64);
 424
 425         strncpy(netdev->name, pci_name(pdev), sizeof(netdev->name) - 1);
 426
 427         adapter->bd_number = cards_found;
 428         adapter->link_speed = 0;
 429         adapter->link_duplex = 0;
 430
 431         /* setup the private structure */
 432
 433         err = ixgb_sw_init(adapter);
 434         if (err)
 435                 goto err_sw_init;
 436
 437         netdev->hw_features = NETIF_F_SG |
 438                            NETIF_F_TSO |
 439                            NETIF_F_HW_CSUM |
 440                            NETIF_F_HW_VLAN_CTAG_TX |
 441                            NETIF_F_HW_VLAN_CTAG_RX;
 442         netdev->features = netdev->hw_features |
 443                            NETIF_F_HW_VLAN_CTAG_FILTER;
 444         netdev->hw_features |= NETIF_F_RXCSUM;
 445
 446         if (pci_using_dac) {
 447                 netdev->features |= NETIF_F_HIGHDMA;
 448                 netdev->vlan_features |= NETIF_F_HIGHDMA;
 449         }
 450
 451         /* MTU range: 68 - 16114 */
 452         netdev->min_mtu = ETH_MIN_MTU;
 453         netdev->max_mtu = IXGB_MAX_JUMBO_FRAME_SIZE - ETH_HLEN;
 454
 455         /* make sure the EEPROM is good */
 456
 457         if (!ixgb_validate_eeprom_checksum(&adapter->hw)) {
 458                 netif_err(adapter, probe, adapter->netdev,
 459                           "The EEPROM Checksum Is Not Valid\n");
 460                 err = -EIO;
 461                 goto err_eeprom;
 462         }
 463
 464         ixgb_get_ee_mac_addr(&adapter->hw, netdev->dev_addr);
 465
 466         if (!is_valid_ether_addr(netdev->dev_addr)) {
 467                 netif_err(adapter, probe, adapter->netdev, "Invalid MAC Address\n");
 468                 err = -EIO;
 469                 goto err_eeprom;
 470         }
 471
 472         adapter->part_num = ixgb_get_ee_pba_number(&adapter->hw);
 473
 474         timer_setup(&adapter->watchdog_timer, ixgb_watchdog, 0);
 475
 476         INIT_WORK(&adapter->tx_timeout_task, ixgb_tx_timeout_task);
 477
 478         strcpy(netdev->name, "eth%d");
 479         err = register_netdev(netdev);
 480         if (err)
 481                 goto err_register;
 482
 483         /* carrier off reporting is important to ethtool even BEFORE open */
 484         netif_carrier_off(netdev);
 485
 486         netif_info(adapter, probe, adapter->netdev,
 487                    "Intel(R) PRO/10GbE Network Connection\n");
 488         ixgb_check_options(adapter);
 489         /* reset the hardware with the new settings */
 490
 491         ixgb_reset(adapter);
 492
 493         cards_found++;
 494         return 0;
 495
 496 err_register:
 497 err_sw_init:
 498 err_eeprom:
 499         iounmap(adapter->hw.hw_addr);
 500 err_ioremap:
 501         free_netdev(netdev);
 502 err_alloc_etherdev:
 503         pci_release_regions(pdev);
 504 err_request_regions:
 505 err_dma_mask:
 506         pci_disable_device(pdev);
 507         return err;
 508 }
 509
 510 /**
 511  * ixgb_remove - Device Removal Routine
 512  * @pdev: PCI device information struct
 513  *
 514  * ixgb_remove is called by the PCI subsystem to alert the driver
 515  * that it should release a PCI device.  The could be caused by a
 516  * Hot-Plug event, or because the driver is going to be removed from
 517  * memory.
 518  **/
 519
 520 static void
 521 ixgb_remove(struct pci_dev *pdev)
 522 {
 523         struct net_device *netdev = pci_get_drvdata(pdev);
 524         struct ixgb_adapter *adapter = netdev_priv(netdev);
 525
 526         cancel_work_sync(&adapter->tx_timeout_task);
 527
 528         unregister_netdev(netdev);
 529
 530         iounmap(adapter->hw.hw_addr);
 531         pci_release_regions(pdev);
 532
 533         free_netdev(netdev);
 534         pci_disable_device(pdev);
 535 }
 536
 537 /**
 538  * ixgb_sw_init - Initialize general software structures (struct ixgb_adapter)
 539  * @adapter: board private structure to initialize
 540  *
 541  * ixgb_sw_init initializes the Adapter private data structure.
 542  * Fields are initialized based on PCI device information and
 543  * OS network device settings (MTU size).
 544  **/
 545
 546 static int
 547 ixgb_sw_init(struct ixgb_adapter *adapter)
 548 {
 549         struct ixgb_hw *hw = &adapter->hw;
 550         struct net_device *netdev = adapter->netdev;
 551         struct pci_dev *pdev = adapter->pdev;
 552
 553         /* PCI config space info */
 554
 555         hw->vendor_id = pdev->vendor;
 556         hw->device_id = pdev->device;
 557         hw->subsystem_vendor_id = pdev->subsystem_vendor;
 558         hw->subsystem_id = pdev->subsystem_device;
 559
 560         hw->max_frame_size = netdev->mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;
 561         adapter->rx_buffer_len = hw->max_frame_size + 8; /* + 8 for errata */
 562
 563         if ((hw->device_id == IXGB_DEVICE_ID_82597EX) ||
 564             (hw->device_id == IXGB_DEVICE_ID_82597EX_CX4) ||
 565             (hw->device_id == IXGB_DEVICE_ID_82597EX_LR) ||
 566             (hw->device_id == IXGB_DEVICE_ID_82597EX_SR))
 567                 hw->mac_type = ixgb_82597;
 568         else {
 569                 /* should never have loaded on this device */
 570                 netif_err(adapter, probe, adapter->netdev, "unsupported device id\n");
 571         }
 572
 573         /* enable flow control to be programmed */
 574         hw->fc.send_xon = 1;
 575
 576         set_bit(__IXGB_DOWN, &adapter->flags);
 577         return 0;
 578 }
 579
 580 /**
 581  * ixgb_open - Called when a network interface is made active
 582  * @netdev: network interface device structure
 583  *
 584  * Returns 0 on success, negative value on failure
 585  *
 586  * The open entry point is called when a network interface is made
 587  * active by the system (IFF_UP).  At this point all resources needed
 588  * for transmit and receive operations are allocated, the interrupt
 589  * handler is registered with the OS, the watchdog timer is started,
 590  * and the stack is notified that the interface is ready.
 591  **/
 592
 593 static int
 594 ixgb_open(struct net_device *netdev)
 595 {
 596         struct ixgb_adapter *adapter = netdev_priv(netdev);
 597         int err;
 598
 599         /* allocate transmit descriptors */
 600         err = ixgb_setup_tx_resources(adapter);
 601         if (err)
 602                 goto err_setup_tx;
 603
 604         netif_carrier_off(netdev);
 605
 606         /* allocate receive descriptors */
 607
 608         err = ixgb_setup_rx_resources(adapter);
 609         if (err)
 610                 goto err_setup_rx;
 611
 612         err = ixgb_up(adapter);
 613         if (err)
 614                 goto err_up;
 615
 616         netif_start_queue(netdev);
 617
 618         return 0;
 619
 620 err_up:
 621         ixgb_free_rx_resources(adapter);
 622 err_setup_rx:
 623         ixgb_free_tx_resources(adapter);
 624 err_setup_tx:
 625         ixgb_reset(adapter);
 626
 627         return err;
 628 }
 629
 630 /**
 631  * ixgb_close - Disables a network interface
 632  * @netdev: network interface device structure
 633  *
 634  * Returns 0, this is not allowed to fail
 635  *
 636  * The close entry point is called when an interface is de-activated
 637  * by the OS.  The hardware is still under the drivers control, but
 638  * needs to be disabled.  A global MAC reset is issued to stop the
 639  * hardware, and all transmit and receive resources are freed.
 640  **/
 641
 642 static int
 643 ixgb_close(struct net_device *netdev)
 644 {
 645         struct ixgb_adapter *adapter = netdev_priv(netdev);
 646
 647         ixgb_down(adapter, true);
 648
 649         ixgb_free_tx_resources(adapter);
 650         ixgb_free_rx_resources(adapter);
 651
 652         return 0;
 653 }
 654
 655 /**
 656  * ixgb_setup_tx_resources - allocate Tx resources (Descriptors)
 657  * @adapter: board private structure
 658  *
 659  * Return 0 on success, negative on failure
 660  **/
 661
 662 int
 663 ixgb_setup_tx_resources(struct ixgb_adapter *adapter)
 664 {
 665         struct ixgb_desc_ring *txdr = &adapter->tx_ring;
 666         struct pci_dev *pdev = adapter->pdev;
 667         int size;
 668
 669         size = sizeof(struct ixgb_buffer) * txdr->count;
 670         txdr->buffer_info = vzalloc(size);
 671         if (!txdr->buffer_info)
 672                 return -ENOMEM;
 673
 674         /* round up to nearest 4K */
 675
 676         txdr->size = txdr->count * sizeof(struct ixgb_tx_desc);
 677         txdr->size = ALIGN(txdr->size, 4096);
 678
 679         txdr->desc = dma_alloc_coherent(&pdev->dev, txdr->size, &txdr->dma,
 680                                         GFP_KERNEL);
 681         if (!txdr->desc) {
 682                 vfree(txdr->buffer_info);
 683                 return -ENOMEM;
 684         }
 685
 686         txdr->next_to_use = 0;
 687         txdr->next_to_clean = 0;
 688
 689         return 0;
 690 }
 691
 692 /**
 693  * ixgb_configure_tx - Configure 82597 Transmit Unit after Reset.
 694  * @adapter: board private structure
 695  *
 696  * Configure the Tx unit of the MAC after a reset.
 697  **/
 698
 699 static void
 700 ixgb_configure_tx(struct ixgb_adapter *adapter)
 701 {
 702         u64 tdba = adapter->tx_ring.dma;
 703         u32 tdlen = adapter->tx_ring.count * sizeof(struct ixgb_tx_desc);
 704         u32 tctl;
 705         struct ixgb_hw *hw = &adapter->hw;
 706
 707         /* Setup the Base and Length of the Tx Descriptor Ring
 708          * tx_ring.dma can be either a 32 or 64 bit value
 709          */
 710
 711         IXGB_WRITE_REG(hw, TDBAL, (tdba & 0x00000000ffffffffULL));
 712         IXGB_WRITE_REG(hw, TDBAH, (tdba >> 32));
 713
 714         IXGB_WRITE_REG(hw, TDLEN, tdlen);
 715
 716         /* Setup the HW Tx Head and Tail descriptor pointers */
 717
 718         IXGB_WRITE_REG(hw, TDH, 0);
 719         IXGB_WRITE_REG(hw, TDT, 0);
 720
 721         /* don't set up txdctl, it induces performance problems if configured
 722          * incorrectly */
 723         /* Set the Tx Interrupt Delay register */
 724
 725         IXGB_WRITE_REG(hw, TIDV, adapter->tx_int_delay);
 726
 727         /* Program the Transmit Control Register */
 728
 729         tctl = IXGB_TCTL_TCE | IXGB_TCTL_TXEN | IXGB_TCTL_TPDE;
 730         IXGB_WRITE_REG(hw, TCTL, tctl);
 731
 732         /* Setup Transmit Descriptor Settings for this adapter */
 733         adapter->tx_cmd_type =
 734                 IXGB_TX_DESC_TYPE |
 735                 (adapter->tx_int_delay_enable ? IXGB_TX_DESC_CMD_IDE : 0);
 736 }
 737
 738 /**
 739  * ixgb_setup_rx_resources - allocate Rx resources (Descriptors)
 740  * @adapter: board private structure
 741  *
 742  * Returns 0 on success, negative on failure
 743  **/
 744
 745 int
 746 ixgb_setup_rx_resources(struct ixgb_adapter *adapter)
 747 {
 748         struct ixgb_desc_ring *rxdr = &adapter->rx_ring;
 749         struct pci_dev *pdev = adapter->pdev;
 750         int size;
 751
 752         size = sizeof(struct ixgb_buffer) * rxdr->count;
 753         rxdr->buffer_info = vzalloc(size);
 754         if (!rxdr->buffer_info)
 755                 return -ENOMEM;
 756
 757         /* Round up to nearest 4K */
 758
 759         rxdr->size = rxdr->count * sizeof(struct ixgb_rx_desc);
 760         rxdr->size = ALIGN(rxdr->size, 4096);
 761
 762         rxdr->desc = dma_alloc_coherent(&pdev->dev, rxdr->size, &rxdr->dma,
 763                                         GFP_KERNEL);
 764
 765         if (!rxdr->desc) {
 766                 vfree(rxdr->buffer_info);
 767                 return -ENOMEM;
 768         }
 769
 770         rxdr->next_to_clean = 0;
 771         rxdr->next_to_use = 0;
 772
 773         return 0;
 774 }
 775
 776 /**
 777  * ixgb_setup_rctl - configure the receive control register
 778  * @adapter: Board private structure
 779  **/
 780
 781 static void
 782 ixgb_setup_rctl(struct ixgb_adapter *adapter)
 783 {
 784         u32 rctl;
 785
 786         rctl = IXGB_READ_REG(&adapter->hw, RCTL);
 787
 788         rctl &= ~(3 << IXGB_RCTL_MO_SHIFT);
 789
 790         rctl |=
 791                 IXGB_RCTL_BAM | IXGB_RCTL_RDMTS_1_2 |
 792                 IXGB_RCTL_RXEN | IXGB_RCTL_CFF |
 793                 (adapter->hw.mc_filter_type << IXGB_RCTL_MO_SHIFT);
 794
 795         rctl |= IXGB_RCTL_SECRC;
 796
 797         if (adapter->rx_buffer_len <= IXGB_RXBUFFER_2048)
 798                 rctl |= IXGB_RCTL_BSIZE_2048;
 799         else if (adapter->rx_buffer_len <= IXGB_RXBUFFER_4096)
 800                 rctl |= IXGB_RCTL_BSIZE_4096;
 801         else if (adapter->rx_buffer_len <= IXGB_RXBUFFER_8192)
 802                 rctl |= IXGB_RCTL_BSIZE_8192;
 803         else if (adapter->rx_buffer_len <= IXGB_RXBUFFER_16384)
 804                 rctl |= IXGB_RCTL_BSIZE_16384;
 805
 806         IXGB_WRITE_REG(&adapter->hw, RCTL, rctl);
 807 }
 808
 809 /**
 810  * ixgb_configure_rx - Configure 82597 Receive Unit after Reset.
 811  * @adapter: board private structure
 812  *
 813  * Configure the Rx unit of the MAC after a reset.
 814  **/
 815
 816 static void
 817 ixgb_configure_rx(struct ixgb_adapter *adapter)
 818 {
 819         u64 rdba = adapter->rx_ring.dma;
 820         u32 rdlen = adapter->rx_ring.count * sizeof(struct ixgb_rx_desc);
 821         struct ixgb_hw *hw = &adapter->hw;
 822         u32 rctl;
 823         u32 rxcsum;
 824
 825         /* make sure receives are disabled while setting up the descriptors */
 826
 827         rctl = IXGB_READ_REG(hw, RCTL);
 828         IXGB_WRITE_REG(hw, RCTL, rctl & ~IXGB_RCTL_RXEN);
 829
 830         /* set the Receive Delay Timer Register */
 831
 832         IXGB_WRITE_REG(hw, RDTR, adapter->rx_int_delay);
 833
 834         /* Setup the Base and Length of the Rx Descriptor Ring */
 835
 836         IXGB_WRITE_REG(hw, RDBAL, (rdba & 0x00000000ffffffffULL));
 837         IXGB_WRITE_REG(hw, RDBAH, (rdba >> 32));
 838
 839         IXGB_WRITE_REG(hw, RDLEN, rdlen);
 840
 841         /* Setup the HW Rx Head and Tail Descriptor Pointers */
 842         IXGB_WRITE_REG(hw, RDH, 0);
 843         IXGB_WRITE_REG(hw, RDT, 0);
 844
 845         /* due to the hardware errata with RXDCTL, we are unable to use any of
 846          * the performance enhancing features of it without causing other
 847          * subtle bugs, some of the bugs could include receive length
 848          * corruption at high data rates (WTHRESH > 0) and/or receive
 849          * descriptor ring irregularites (particularly in hardware cache) */
 850         IXGB_WRITE_REG(hw, RXDCTL, 0);
 851
 852         /* Enable Receive Checksum Offload for TCP and UDP */
 853         if (adapter->rx_csum) {
 854                 rxcsum = IXGB_READ_REG(hw, RXCSUM);
 855                 rxcsum |= IXGB_RXCSUM_TUOFL;
 856                 IXGB_WRITE_REG(hw, RXCSUM, rxcsum);
 857         }
 858
 859         /* Enable Receives */
 860
 861         IXGB_WRITE_REG(hw, RCTL, rctl);
 862 }
 863
 864 /**
 865  * ixgb_free_tx_resources - Free Tx Resources
 866  * @adapter: board private structure
 867  *
 868  * Free all transmit software resources
 869  **/
 870
 871 void
 872 ixgb_free_tx_resources(struct ixgb_adapter *adapter)
 873 {
 874         struct pci_dev *pdev = adapter->pdev;
 875
 876         ixgb_clean_tx_ring(adapter);
 877
 878         vfree(adapter->tx_ring.buffer_info);
 879         adapter->tx_ring.buffer_info = NULL;
 880
 881         dma_free_coherent(&pdev->dev, adapter->tx_ring.size,
 882                           adapter->tx_ring.desc, adapter->tx_ring.dma);
 883
 884         adapter->tx_ring.desc = NULL;
 885 }
 886
 887 static void
 888 ixgb_unmap_and_free_tx_resource(struct ixgb_adapter *adapter,
 889                                 struct ixgb_buffer *buffer_info)
 890 {
 891         if (buffer_info->dma) {
 892                 if (buffer_info->mapped_as_page)
 893                         dma_unmap_page(&adapter->pdev->dev, buffer_info->dma,
 894                                        buffer_info->length, DMA_TO_DEVICE);
 895                 else
 896                         dma_unmap_single(&adapter->pdev->dev, buffer_info->dma,
 897                                          buffer_info->length, DMA_TO_DEVICE);
 898                 buffer_info->dma = 0;
 899         }
 900
 901         if (buffer_info->skb) {
 902                 dev_kfree_skb_any(buffer_info->skb);
 903                 buffer_info->skb = NULL;
 904         }
 905         buffer_info->time_stamp = 0;
 906         /* these fields must always be initialized in tx
 907          * buffer_info->length = 0;
 908          * buffer_info->next_to_watch = 0; */
 909 }
 910
 911 /**
 912  * ixgb_clean_tx_ring - Free Tx Buffers
 913  * @adapter: board private structure
 914  **/
 915
 916 static void
 917 ixgb_clean_tx_ring(struct ixgb_adapter *adapter)
 918 {
 919         struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
 920         struct ixgb_buffer *buffer_info;
 921         unsigned long size;
 922         unsigned int i;
 923
 924         /* Free all the Tx ring sk_buffs */
 925
 926         for (i = 0; i < tx_ring->count; i++) {
 927                 buffer_info = &tx_ring->buffer_info[i];
 928                 ixgb_unmap_and_free_tx_resource(adapter, buffer_info);
 929         }
 930
 931         size = sizeof(struct ixgb_buffer) * tx_ring->count;
 932         memset(tx_ring->buffer_info, 0, size);
 933
 934         /* Zero out the descriptor ring */
 935
 936         memset(tx_ring->desc, 0, tx_ring->size);
 937
 938         tx_ring->next_to_use = 0;
 939         tx_ring->next_to_clean = 0;
 940
 941         IXGB_WRITE_REG(&adapter->hw, TDH, 0);
 942         IXGB_WRITE_REG(&adapter->hw, TDT, 0);
 943 }
 944
 945 /**
 946  * ixgb_free_rx_resources - Free Rx Resources
 947  * @adapter: board private structure
 948  *
 949  * Free all receive software resources
 950  **/
 951
 952 void
 953 ixgb_free_rx_resources(struct ixgb_adapter *adapter)
 954 {
 955         struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
 956         struct pci_dev *pdev = adapter->pdev;
 957
 958         ixgb_clean_rx_ring(adapter);
 959
 960         vfree(rx_ring->buffer_info);
 961         rx_ring->buffer_info = NULL;
 962
 963         dma_free_coherent(&pdev->dev, rx_ring->size, rx_ring->desc,
 964                           rx_ring->dma);
 965
 966         rx_ring->desc = NULL;
 967 }
 968
 969 /**
 970  * ixgb_clean_rx_ring - Free Rx Buffers
 971  * @adapter: board private structure
 972  **/
 973
 974 static void
 975 ixgb_clean_rx_ring(struct ixgb_adapter *adapter)
 976 {
 977         struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
 978         struct ixgb_buffer *buffer_info;
 979         struct pci_dev *pdev = adapter->pdev;
 980         unsigned long size;
 981         unsigned int i;
 982
 983         /* Free all the Rx ring sk_buffs */
 984
 985         for (i = 0; i < rx_ring->count; i++) {
 986                 buffer_info = &rx_ring->buffer_info[i];
 987                 if (buffer_info->dma) {
 988                         dma_unmap_single(&pdev->dev,
 989                                          buffer_info->dma,
 990                                          buffer_info->length,
 991                                          DMA_FROM_DEVICE);
 992                         buffer_info->dma = 0;
 993                         buffer_info->length = 0;
 994                 }
 995
 996                 if (buffer_info->skb) {
 997                         dev_kfree_skb(buffer_info->skb);
 998                         buffer_info->skb = NULL;
 999                 }
1000         }
1001
1002         size = sizeof(struct ixgb_buffer) * rx_ring->count;
1003         memset(rx_ring->buffer_info, 0, size);
1004
1005         /* Zero out the descriptor ring */
1006
1007         memset(rx_ring->desc, 0, rx_ring->size);
1008
1009         rx_ring->next_to_clean = 0;
1010         rx_ring->next_to_use = 0;
1011
1012         IXGB_WRITE_REG(&adapter->hw, RDH, 0);
1013         IXGB_WRITE_REG(&adapter->hw, RDT, 0);
1014 }
1015
1016 /**
1017  * ixgb_set_mac - Change the Ethernet Address of the NIC
1018  * @netdev: network interface device structure
1019  * @p: pointer to an address structure
1020  *
1021  * Returns 0 on success, negative on failure
1022  **/
1023
1024 static int
1025 ixgb_set_mac(struct net_device *netdev, void *p)
1026 {
1027         struct ixgb_adapter *adapter = netdev_priv(netdev);
1028         struct sockaddr *addr = p;
1029
1030         if (!is_valid_ether_addr(addr->sa_data))
1031                 return -EADDRNOTAVAIL;
1032
1033         memcpy(netdev->dev_addr, addr->sa_data, netdev->addr_len);
1034
1035         ixgb_rar_set(&adapter->hw, addr->sa_data, 0);
1036
1037         return 0;
1038 }
1039
1040 /**
1041  * ixgb_set_multi - Multicast and Promiscuous mode set
1042  * @netdev: network interface device structure
1043  *
1044  * The set_multi entry point is called whenever the multicast address
1045  * list or the network interface flags are updated.  This routine is
1046  * responsible for configuring the hardware for proper multicast,
1047  * promiscuous mode, and all-multi behavior.
1048  **/
1049
1050 static void
1051 ixgb_set_multi(struct net_device *netdev)
1052 {
1053         struct ixgb_adapter *adapter = netdev_priv(netdev);
1054         struct ixgb_hw *hw = &adapter->hw;
1055         struct netdev_hw_addr *ha;
1056         u32 rctl;
1057
1058         /* Check for Promiscuous and All Multicast modes */
1059
1060         rctl = IXGB_READ_REG(hw, RCTL);
1061
1062         if (netdev->flags & IFF_PROMISC) {
1063                 rctl |= (IXGB_RCTL_UPE | IXGB_RCTL_MPE);
1064                 /* disable VLAN filtering */
1065                 rctl &= ~IXGB_RCTL_CFIEN;
1066                 rctl &= ~IXGB_RCTL_VFE;
1067         } else {
1068                 if (netdev->flags & IFF_ALLMULTI) {
1069                         rctl |= IXGB_RCTL_MPE;
1070                         rctl &= ~IXGB_RCTL_UPE;
1071                 } else {
1072                         rctl &= ~(IXGB_RCTL_UPE | IXGB_RCTL_MPE);
1073                 }
1074                 /* enable VLAN filtering */
1075                 rctl |= IXGB_RCTL_VFE;
1076                 rctl &= ~IXGB_RCTL_CFIEN;
1077         }
1078
1079         if (netdev_mc_count(netdev) > IXGB_MAX_NUM_MULTICAST_ADDRESSES) {
1080                 rctl |= IXGB_RCTL_MPE;
1081                 IXGB_WRITE_REG(hw, RCTL, rctl);
1082         } else {
1083                 u8 *mta = kmalloc_array(ETH_ALEN,
1084                                         IXGB_MAX_NUM_MULTICAST_ADDRESSES,
1085                                         GFP_ATOMIC);
1086                 u8 *addr;
1087                 if (!mta)
1088                         goto alloc_failed;
1089
1090                 IXGB_WRITE_REG(hw, RCTL, rctl);
1091
1092                 addr = mta;
1093                 netdev_for_each_mc_addr(ha, netdev) {
1094                         memcpy(addr, ha->addr, ETH_ALEN);
1095                         addr += ETH_ALEN;
1096                 }
1097
1098                 ixgb_mc_addr_list_update(hw, mta, netdev_mc_count(netdev), 0);
1099                 kfree(mta);
1100         }
1101
1102 alloc_failed:
1103         if (netdev->features & NETIF_F_HW_VLAN_CTAG_RX)
1104                 ixgb_vlan_strip_enable(adapter);
1105         else
1106                 ixgb_vlan_strip_disable(adapter);
1107
1108 }
1109
1110 /**
1111  * ixgb_watchdog - Timer Call-back
1112  * @data: pointer to netdev cast into an unsigned long
1113  **/
1114
1115 static void
1116 ixgb_watchdog(struct timer_list *t)
1117 {
1118         struct ixgb_adapter *adapter = from_timer(adapter, t, watchdog_timer);
1119         struct net_device *netdev = adapter->netdev;
1120         struct ixgb_desc_ring *txdr = &adapter->tx_ring;
1121
1122         ixgb_check_for_link(&adapter->hw);
1123
1124         if (ixgb_check_for_bad_link(&adapter->hw)) {
1125                 /* force the reset path */
1126                 netif_stop_queue(netdev);
1127         }
1128
1129         if (adapter->hw.link_up) {
1130                 if (!netif_carrier_ok(netdev)) {
1131                         netdev_info(netdev,
1132                                     "NIC Link is Up 10 Gbps Full Duplex, Flow Control: %s\n",
1133                                     (adapter->hw.fc.type == ixgb_fc_full) ?
1134                                     "RX/TX" :
1135                                     (adapter->hw.fc.type == ixgb_fc_rx_pause) ?
1136                                      "RX" :
1137                                     (adapter->hw.fc.type == ixgb_fc_tx_pause) ?
1138                                     "TX" : "None");
1139                         adapter->link_speed = 10000;
1140                         adapter->link_duplex = FULL_DUPLEX;
1141                         netif_carrier_on(netdev);
1142                 }
1143         } else {
1144                 if (netif_carrier_ok(netdev)) {
1145                         adapter->link_speed = 0;
1146                         adapter->link_duplex = 0;
1147                         netdev_info(netdev, "NIC Link is Down\n");
1148                         netif_carrier_off(netdev);
1149                 }
1150         }
1151
1152         ixgb_update_stats(adapter);
1153
1154         if (!netif_carrier_ok(netdev)) {
1155                 if (IXGB_DESC_UNUSED(txdr) + 1 < txdr->count) {
1156                         /* We've lost link, so the controller stops DMA,
1157                          * but we've got queued Tx work that's never going
1158                          * to get done, so reset controller to flush Tx.
1159                          * (Do the reset outside of interrupt context). */
1160                         schedule_work(&adapter->tx_timeout_task);
1161                         /* return immediately since reset is imminent */
1162                         return;
1163                 }
1164         }
1165
1166         /* Force detection of hung controller every watchdog period */
1167         adapter->detect_tx_hung = true;
1168
1169         /* generate an interrupt to force clean up of any stragglers */
1170         IXGB_WRITE_REG(&adapter->hw, ICS, IXGB_INT_TXDW);
1171
1172         /* Reset the timer */
1173         mod_timer(&adapter->watchdog_timer, jiffies + 2 * HZ);
1174 }
1175
1176 #define IXGB_TX_FLAGS_CSUM              0x00000001
1177 #define IXGB_TX_FLAGS_VLAN              0x00000002
1178 #define IXGB_TX_FLAGS_TSO               0x00000004
1179
1180 static int
1181 ixgb_tso(struct ixgb_adapter *adapter, struct sk_buff *skb)
1182 {
1183         struct ixgb_context_desc *context_desc;
1184         unsigned int i;
1185         u8 ipcss, ipcso, tucss, tucso, hdr_len;
1186         u16 ipcse, tucse, mss;
1187
1188         if (likely(skb_is_gso(skb))) {
1189                 struct ixgb_buffer *buffer_info;
1190                 struct iphdr *iph;
1191                 int err;
1192
1193                 err = skb_cow_head(skb, 0);
1194                 if (err < 0)
1195                         return err;
1196
1197                 hdr_len = skb_transport_offset(skb) + tcp_hdrlen(skb);
1198                 mss = skb_shinfo(skb)->gso_size;
1199                 iph = ip_hdr(skb);
1200                 iph->tot_len = 0;
1201                 iph->check = 0;
1202                 tcp_hdr(skb)->check = ~csum_tcpudp_magic(iph->saddr,
1203                                                          iph->daddr, 0,
1204                                                          IPPROTO_TCP, 0);
1205                 ipcss = skb_network_offset(skb);
1206                 ipcso = (void *)&(iph->check) - (void *)skb->data;
1207                 ipcse = skb_transport_offset(skb) - 1;
1208                 tucss = skb_transport_offset(skb);
1209                 tucso = (void *)&(tcp_hdr(skb)->check) - (void *)skb->data;
1210                 tucse = 0;
1211
1212                 i = adapter->tx_ring.next_to_use;
1213                 context_desc = IXGB_CONTEXT_DESC(adapter->tx_ring, i);
1214                 buffer_info = &adapter->tx_ring.buffer_info[i];
1215                 WARN_ON(buffer_info->dma != 0);
1216
1217                 context_desc->ipcss = ipcss;
1218                 context_desc->ipcso = ipcso;
1219                 context_desc->ipcse = cpu_to_le16(ipcse);
1220                 context_desc->tucss = tucss;
1221                 context_desc->tucso = tucso;
1222                 context_desc->tucse = cpu_to_le16(tucse);
1223                 context_desc->mss = cpu_to_le16(mss);
1224                 context_desc->hdr_len = hdr_len;
1225                 context_desc->status = 0;
1226                 context_desc->cmd_type_len = cpu_to_le32(
1227                                                   IXGB_CONTEXT_DESC_TYPE
1228                                                 | IXGB_CONTEXT_DESC_CMD_TSE
1229                                                 | IXGB_CONTEXT_DESC_CMD_IP
1230                                                 | IXGB_CONTEXT_DESC_CMD_TCP
1231                                                 | IXGB_CONTEXT_DESC_CMD_IDE
1232                                                 | (skb->len - (hdr_len)));
1233
1234
1235                 if (++i == adapter->tx_ring.count) i = 0;
1236                 adapter->tx_ring.next_to_use = i;
1237
1238                 return 1;
1239         }
1240
1241         return 0;
1242 }
1243
1244 static bool
1245 ixgb_tx_csum(struct ixgb_adapter *adapter, struct sk_buff *skb)
1246 {
1247         struct ixgb_context_desc *context_desc;
1248         unsigned int i;
1249         u8 css, cso;
1250
1251         if (likely(skb->ip_summed == CHECKSUM_PARTIAL)) {
1252                 struct ixgb_buffer *buffer_info;
1253                 css = skb_checksum_start_offset(skb);
1254                 cso = css + skb->csum_offset;
1255
1256                 i = adapter->tx_ring.next_to_use;
1257                 context_desc = IXGB_CONTEXT_DESC(adapter->tx_ring, i);
1258                 buffer_info = &adapter->tx_ring.buffer_info[i];
1259                 WARN_ON(buffer_info->dma != 0);
1260
1261                 context_desc->tucss = css;
1262                 context_desc->tucso = cso;
1263                 context_desc->tucse = 0;
1264                 /* zero out any previously existing data in one instruction */
1265                 *(u32 *)&(context_desc->ipcss) = 0;
1266                 context_desc->status = 0;
1267                 context_desc->hdr_len = 0;
1268                 context_desc->mss = 0;
1269                 context_desc->cmd_type_len =
1270                         cpu_to_le32(IXGB_CONTEXT_DESC_TYPE
1271                                     | IXGB_TX_DESC_CMD_IDE);
1272
1273                 if (++i == adapter->tx_ring.count) i = 0;
1274                 adapter->tx_ring.next_to_use = i;
1275
1276                 return true;
1277         }
1278
1279         return false;
1280 }
1281
1282 #define IXGB_MAX_TXD_PWR        14
1283 #define IXGB_MAX_DATA_PER_TXD   (1<<IXGB_MAX_TXD_PWR)
1284
1285 static int
1286 ixgb_tx_map(struct ixgb_adapter *adapter, struct sk_buff *skb,
1287             unsigned int first)
1288 {
1289         struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
1290         struct pci_dev *pdev = adapter->pdev;
1291         struct ixgb_buffer *buffer_info;
1292         int len = skb_headlen(skb);
1293         unsigned int offset = 0, size, count = 0, i;
1294         unsigned int mss = skb_shinfo(skb)->gso_size;
1295         unsigned int nr_frags = skb_shinfo(skb)->nr_frags;
1296         unsigned int f;
1297
1298         i = tx_ring->next_to_use;
1299
1300         while (len) {
1301                 buffer_info = &tx_ring->buffer_info[i];
1302                 size = min(len, IXGB_MAX_DATA_PER_TXD);
1303                 /* Workaround for premature desc write-backs
1304                  * in TSO mode.  Append 4-byte sentinel desc */
1305                 if (unlikely(mss && !nr_frags && size == len && size > 8))
1306                         size -= 4;
1307
1308                 buffer_info->length = size;
1309                 WARN_ON(buffer_info->dma != 0);
1310                 buffer_info->time_stamp = jiffies;
1311                 buffer_info->mapped_as_page = false;
1312                 buffer_info->dma = dma_map_single(&pdev->dev,
1313                                                   skb->data + offset,
1314                                                   size, DMA_TO_DEVICE);
1315                 if (dma_mapping_error(&pdev->dev, buffer_info->dma))
1316                         goto dma_error;
1317                 buffer_info->next_to_watch = 0;
1318
1319                 len -= size;
1320                 offset += size;
1321                 count++;
1322                 if (len) {
1323                         i++;
1324                         if (i == tx_ring->count)
1325                                 i = 0;
1326                 }
1327         }
1328
1329         for (f = 0; f < nr_frags; f++) {
1330                 const skb_frag_t *frag = &skb_shinfo(skb)->frags[f];
1331                 len = skb_frag_size(frag);
1332                 offset = 0;
1333
1334                 while (len) {
1335                         i++;
1336                         if (i == tx_ring->count)
1337                                 i = 0;
1338
1339                         buffer_info = &tx_ring->buffer_info[i];
1340                         size = min(len, IXGB_MAX_DATA_PER_TXD);
1341
1342                         /* Workaround for premature desc write-backs
1343                          * in TSO mode.  Append 4-byte sentinel desc */
1344                         if (unlikely(mss && (f == (nr_frags - 1))
1345                                      && size == len && size > 8))
1346                                 size -= 4;
1347
1348                         buffer_info->length = size;
1349                         buffer_info->time_stamp = jiffies;
1350                         buffer_info->mapped_as_page = true;
1351                         buffer_info->dma =
1352                                 skb_frag_dma_map(&pdev->dev, frag, offset, size,
1353                                                  DMA_TO_DEVICE);
1354                         if (dma_mapping_error(&pdev->dev, buffer_info->dma))
1355                                 goto dma_error;
1356                         buffer_info->next_to_watch = 0;
1357
1358                         len -= size;
1359                         offset += size;
1360                         count++;
1361                 }
1362         }
1363         tx_ring->buffer_info[i].skb = skb;
1364         tx_ring->buffer_info[first].next_to_watch = i;
1365
1366         return count;
1367
1368 dma_error:
1369         dev_err(&pdev->dev, "TX DMA map failed\n");
1370         buffer_info->dma = 0;
1371         if (count)
1372                 count--;
1373
1374         while (count--) {
1375                 if (i==0)
1376                         i += tx_ring->count;
1377                 i--;
1378                 buffer_info = &tx_ring->buffer_info[i];
1379                 ixgb_unmap_and_free_tx_resource(adapter, buffer_info);
1380         }
1381
1382         return 0;
1383 }
1384
1385 static void
1386 ixgb_tx_queue(struct ixgb_adapter *adapter, int count, int vlan_id,int tx_flags)
1387 {
1388         struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
1389         struct ixgb_tx_desc *tx_desc = NULL;
1390         struct ixgb_buffer *buffer_info;
1391         u32 cmd_type_len = adapter->tx_cmd_type;
1392         u8 status = 0;
1393         u8 popts = 0;
1394         unsigned int i;
1395
1396         if (tx_flags & IXGB_TX_FLAGS_TSO) {
1397                 cmd_type_len |= IXGB_TX_DESC_CMD_TSE;
1398                 popts |= (IXGB_TX_DESC_POPTS_IXSM | IXGB_TX_DESC_POPTS_TXSM);
1399         }
1400
1401         if (tx_flags & IXGB_TX_FLAGS_CSUM)
1402                 popts |= IXGB_TX_DESC_POPTS_TXSM;
1403
1404         if (tx_flags & IXGB_TX_FLAGS_VLAN)
1405                 cmd_type_len |= IXGB_TX_DESC_CMD_VLE;
1406
1407         i = tx_ring->next_to_use;
1408
1409         while (count--) {
1410                 buffer_info = &tx_ring->buffer_info[i];
1411                 tx_desc = IXGB_TX_DESC(*tx_ring, i);
1412                 tx_desc->buff_addr = cpu_to_le64(buffer_info->dma);
1413                 tx_desc->cmd_type_len =
1414                         cpu_to_le32(cmd_type_len | buffer_info->length);
1415                 tx_desc->status = status;
1416                 tx_desc->popts = popts;
1417                 tx_desc->vlan = cpu_to_le16(vlan_id);
1418
1419                 if (++i == tx_ring->count) i = 0;
1420         }
1421
1422         tx_desc->cmd_type_len |=
1423                 cpu_to_le32(IXGB_TX_DESC_CMD_EOP | IXGB_TX_DESC_CMD_RS);
1424
1425         /* Force memory writes to complete before letting h/w
1426          * know there are new descriptors to fetch.  (Only
1427          * applicable for weak-ordered memory model archs,
1428          * such as IA-64). */
1429         wmb();
1430
1431         tx_ring->next_to_use = i;
1432         IXGB_WRITE_REG(&adapter->hw, TDT, i);
1433 }
1434
1435 static int __ixgb_maybe_stop_tx(struct net_device *netdev, int size)
1436 {
1437         struct ixgb_adapter *adapter = netdev_priv(netdev);
1438         struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
1439
1440         netif_stop_queue(netdev);
1441         /* Herbert's original patch had:
1442          *  smp_mb__after_netif_stop_queue();
1443          * but since that doesn't exist yet, just open code it. */
1444         smp_mb();
1445
1446         /* We need to check again in a case another CPU has just
1447          * made room available. */
1448         if (likely(IXGB_DESC_UNUSED(tx_ring) < size))
1449                 return -EBUSY;
1450
1451         /* A reprieve! */
1452         netif_start_queue(netdev);
1453         ++adapter->restart_queue;
1454         return 0;
1455 }
1456
1457 static int ixgb_maybe_stop_tx(struct net_device *netdev,
1458                               struct ixgb_desc_ring *tx_ring, int size)
1459 {
1460         if (likely(IXGB_DESC_UNUSED(tx_ring) >= size))
1461                 return 0;
1462         return __ixgb_maybe_stop_tx(netdev, size);
1463 }
1464
1465
1466 /* Tx Descriptors needed, worst case */
1467 #define TXD_USE_COUNT(S) (((S) >> IXGB_MAX_TXD_PWR) + \
1468                          (((S) & (IXGB_MAX_DATA_PER_TXD - 1)) ? 1 : 0))
1469 #define DESC_NEEDED TXD_USE_COUNT(IXGB_MAX_DATA_PER_TXD) /* skb->date */ + \
1470         MAX_SKB_FRAGS * TXD_USE_COUNT(PAGE_SIZE) + 1 /* for context */ \
1471         + 1 /* one more needed for sentinel TSO workaround */
1472
1473 static netdev_tx_t
1474 ixgb_xmit_frame(struct sk_buff *skb, struct net_device *netdev)
1475 {
1476         struct ixgb_adapter *adapter = netdev_priv(netdev);
1477         unsigned int first;
1478         unsigned int tx_flags = 0;
1479         int vlan_id = 0;
1480         int count = 0;
1481         int tso;
1482
1483         if (test_bit(__IXGB_DOWN, &adapter->flags)) {
1484                 dev_kfree_skb_any(skb);
1485                 return NETDEV_TX_OK;
1486         }
1487
1488         if (skb->len <= 0) {
1489                 dev_kfree_skb_any(skb);
1490                 return NETDEV_TX_OK;
1491         }
1492
1493         if (unlikely(ixgb_maybe_stop_tx(netdev, &adapter->tx_ring,
1494                      DESC_NEEDED)))
1495                 return NETDEV_TX_BUSY;
1496
1497         if (skb_vlan_tag_present(skb)) {
1498                 tx_flags |= IXGB_TX_FLAGS_VLAN;
1499                 vlan_id = skb_vlan_tag_get(skb);
1500         }
1501
1502         first = adapter->tx_ring.next_to_use;
1503
1504         tso = ixgb_tso(adapter, skb);
1505         if (tso < 0) {
1506                 dev_kfree_skb_any(skb);
1507                 return NETDEV_TX_OK;
1508         }
1509
1510         if (likely(tso))
1511                 tx_flags |= IXGB_TX_FLAGS_TSO;
1512         else if (ixgb_tx_csum(adapter, skb))
1513                 tx_flags |= IXGB_TX_FLAGS_CSUM;
1514
1515         count = ixgb_tx_map(adapter, skb, first);
1516
1517         if (count) {
1518                 ixgb_tx_queue(adapter, count, vlan_id, tx_flags);
1519                 /* Make sure there is space in the ring for the next send. */
1520                 ixgb_maybe_stop_tx(netdev, &adapter->tx_ring, DESC_NEEDED);
1521
1522         } else {
1523                 dev_kfree_skb_any(skb);
1524                 adapter->tx_ring.buffer_info[first].time_stamp = 0;
1525                 adapter->tx_ring.next_to_use = first;
1526         }
1527
1528         return NETDEV_TX_OK;
1529 }
1530
1531 /**
1532  * ixgb_tx_timeout - Respond to a Tx Hang
1533  * @netdev: network interface device structure
1534  **/
1535
1536 static void
1537 ixgb_tx_timeout(struct net_device *netdev, unsigned int txqueue)
1538 {
1539         struct ixgb_adapter *adapter = netdev_priv(netdev);
1540
1541         /* Do the reset outside of interrupt context */
1542         schedule_work(&adapter->tx_timeout_task);
1543 }
1544
1545 static void
1546 ixgb_tx_timeout_task(struct work_struct *work)
1547 {
1548         struct ixgb_adapter *adapter =
1549                 container_of(work, struct ixgb_adapter, tx_timeout_task);
1550
1551         adapter->tx_timeout_count++;
1552         ixgb_down(adapter, true);
1553         ixgb_up(adapter);
1554 }
1555
1556 /**
1557  * ixgb_change_mtu - Change the Maximum Transfer Unit
1558  * @netdev: network interface device structure
1559  * @new_mtu: new value for maximum frame size
1560  *
1561  * Returns 0 on success, negative on failure
1562  **/
1563
1564 static int
1565 ixgb_change_mtu(struct net_device *netdev, int new_mtu)
1566 {
1567         struct ixgb_adapter *adapter = netdev_priv(netdev);
1568         int max_frame = new_mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;
1569
1570         if (netif_running(netdev))
1571                 ixgb_down(adapter, true);
1572
1573         adapter->rx_buffer_len = max_frame + 8; /* + 8 for errata */
1574
1575         netdev->mtu = new_mtu;
1576
1577         if (netif_running(netdev))
1578                 ixgb_up(adapter);
1579
1580         return 0;
1581 }
1582
1583 /**
1584  * ixgb_update_stats - Update the board statistics counters.
1585  * @adapter: board private structure
1586  **/
1587
1588 void
1589 ixgb_update_stats(struct ixgb_adapter *adapter)
1590 {
1591         struct net_device *netdev = adapter->netdev;
1592         struct pci_dev *pdev = adapter->pdev;
1593
1594         /* Prevent stats update while adapter is being reset */
1595         if (pci_channel_offline(pdev))
1596                 return;
1597
1598         if ((netdev->flags & IFF_PROMISC) || (netdev->flags & IFF_ALLMULTI) ||
1599            (netdev_mc_count(netdev) > IXGB_MAX_NUM_MULTICAST_ADDRESSES)) {
1600                 u64 multi = IXGB_READ_REG(&adapter->hw, MPRCL);
1601                 u32 bcast_l = IXGB_READ_REG(&adapter->hw, BPRCL);
1602                 u32 bcast_h = IXGB_READ_REG(&adapter->hw, BPRCH);
1603                 u64 bcast = ((u64)bcast_h << 32) | bcast_l;
1604
1605                 multi |= ((u64)IXGB_READ_REG(&adapter->hw, MPRCH) << 32);
1606                 /* fix up multicast stats by removing broadcasts */
1607                 if (multi >= bcast)
1608                         multi -= bcast;
1609
1610                 adapter->stats.mprcl += (multi & 0xFFFFFFFF);
1611                 adapter->stats.mprch += (multi >> 32);
1612                 adapter->stats.bprcl += bcast_l;
1613                 adapter->stats.bprch += bcast_h;
1614         } else {
1615                 adapter->stats.mprcl += IXGB_READ_REG(&adapter->hw, MPRCL);
1616                 adapter->stats.mprch += IXGB_READ_REG(&adapter->hw, MPRCH);
1617                 adapter->stats.bprcl += IXGB_READ_REG(&adapter->hw, BPRCL);
1618                 adapter->stats.bprch += IXGB_READ_REG(&adapter->hw, BPRCH);
1619         }
1620         adapter->stats.tprl += IXGB_READ_REG(&adapter->hw, TPRL);
1621         adapter->stats.tprh += IXGB_READ_REG(&adapter->hw, TPRH);
1622         adapter->stats.gprcl += IXGB_READ_REG(&adapter->hw, GPRCL);
1623         adapter->stats.gprch += IXGB_READ_REG(&adapter->hw, GPRCH);
1624         adapter->stats.uprcl += IXGB_READ_REG(&adapter->hw, UPRCL);
1625         adapter->stats.uprch += IXGB_READ_REG(&adapter->hw, UPRCH);
1626         adapter->stats.vprcl += IXGB_READ_REG(&adapter->hw, VPRCL);
1627         adapter->stats.vprch += IXGB_READ_REG(&adapter->hw, VPRCH);
1628         adapter->stats.jprcl += IXGB_READ_REG(&adapter->hw, JPRCL);
1629         adapter->stats.jprch += IXGB_READ_REG(&adapter->hw, JPRCH);
1630         adapter->stats.gorcl += IXGB_READ_REG(&adapter->hw, GORCL);
1631         adapter->stats.gorch += IXGB_READ_REG(&adapter->hw, GORCH);
1632         adapter->stats.torl += IXGB_READ_REG(&adapter->hw, TORL);
1633         adapter->stats.torh += IXGB_READ_REG(&adapter->hw, TORH);
1634         adapter->stats.rnbc += IXGB_READ_REG(&adapter->hw, RNBC);
1635         adapter->stats.ruc += IXGB_READ_REG(&adapter->hw, RUC);
1636         adapter->stats.roc += IXGB_READ_REG(&adapter->hw, ROC);
1637         adapter->stats.rlec += IXGB_READ_REG(&adapter->hw, RLEC);
1638         adapter->stats.crcerrs += IXGB_READ_REG(&adapter->hw, CRCERRS);
1639         adapter->stats.icbc += IXGB_READ_REG(&adapter->hw, ICBC);
1640         adapter->stats.ecbc += IXGB_READ_REG(&adapter->hw, ECBC);
1641         adapter->stats.mpc += IXGB_READ_REG(&adapter->hw, MPC);
1642         adapter->stats.tptl += IXGB_READ_REG(&adapter->hw, TPTL);
1643         adapter->stats.tpth += IXGB_READ_REG(&adapter->hw, TPTH);
1644         adapter->stats.gptcl += IXGB_READ_REG(&adapter->hw, GPTCL);
1645         adapter->stats.gptch += IXGB_READ_REG(&adapter->hw, GPTCH);
1646         adapter->stats.bptcl += IXGB_READ_REG(&adapter->hw, BPTCL);
1647         adapter->stats.bptch += IXGB_READ_REG(&adapter->hw, BPTCH);
1648         adapter->stats.mptcl += IXGB_READ_REG(&adapter->hw, MPTCL);
1649         adapter->stats.mptch += IXGB_READ_REG(&adapter->hw, MPTCH);
1650         adapter->stats.uptcl += IXGB_READ_REG(&adapter->hw, UPTCL);
1651         adapter->stats.uptch += IXGB_READ_REG(&adapter->hw, UPTCH);
1652         adapter->stats.vptcl += IXGB_READ_REG(&adapter->hw, VPTCL);
1653         adapter->stats.vptch += IXGB_READ_REG(&adapter->hw, VPTCH);
1654         adapter->stats.jptcl += IXGB_READ_REG(&adapter->hw, JPTCL);
1655         adapter->stats.jptch += IXGB_READ_REG(&adapter->hw, JPTCH);
1656         adapter->stats.gotcl += IXGB_READ_REG(&adapter->hw, GOTCL);
1657         adapter->stats.gotch += IXGB_READ_REG(&adapter->hw, GOTCH);
1658         adapter->stats.totl += IXGB_READ_REG(&adapter->hw, TOTL);
1659         adapter->stats.toth += IXGB_READ_REG(&adapter->hw, TOTH);
1660         adapter->stats.dc += IXGB_READ_REG(&adapter->hw, DC);
1661         adapter->stats.plt64c += IXGB_READ_REG(&adapter->hw, PLT64C);
1662         adapter->stats.tsctc += IXGB_READ_REG(&adapter->hw, TSCTC);
1663         adapter->stats.tsctfc += IXGB_READ_REG(&adapter->hw, TSCTFC);
1664         adapter->stats.ibic += IXGB_READ_REG(&adapter->hw, IBIC);
1665         adapter->stats.rfc += IXGB_READ_REG(&adapter->hw, RFC);
1666         adapter->stats.lfc += IXGB_READ_REG(&adapter->hw, LFC);
1667         adapter->stats.pfrc += IXGB_READ_REG(&adapter->hw, PFRC);
1668         adapter->stats.pftc += IXGB_READ_REG(&adapter->hw, PFTC);
1669         adapter->stats.mcfrc += IXGB_READ_REG(&adapter->hw, MCFRC);
1670         adapter->stats.mcftc += IXGB_READ_REG(&adapter->hw, MCFTC);
1671         adapter->stats.xonrxc += IXGB_READ_REG(&adapter->hw, XONRXC);
1672         adapter->stats.xontxc += IXGB_READ_REG(&adapter->hw, XONTXC);
1673         adapter->stats.xoffrxc += IXGB_READ_REG(&adapter->hw, XOFFRXC);
1674         adapter->stats.xofftxc += IXGB_READ_REG(&adapter->hw, XOFFTXC);
1675         adapter->stats.rjc += IXGB_READ_REG(&adapter->hw, RJC);
1676
1677         /* Fill out the OS statistics structure */
1678
1679         netdev->stats.rx_packets = adapter->stats.gprcl;
1680         netdev->stats.tx_packets = adapter->stats.gptcl;
1681         netdev->stats.rx_bytes = adapter->stats.gorcl;
1682         netdev->stats.tx_bytes = adapter->stats.gotcl;
1683         netdev->stats.multicast = adapter->stats.mprcl;
1684         netdev->stats.collisions = 0;
1685
1686         /* ignore RLEC as it reports errors for padded (<64bytes) frames
1687          * with a length in the type/len field */
1688         netdev->stats.rx_errors =
1689             /* adapter->stats.rnbc + */ adapter->stats.crcerrs +
1690             adapter->stats.ruc +
1691             adapter->stats.roc /*+ adapter->stats.rlec */  +
1692             adapter->stats.icbc +
1693             adapter->stats.ecbc + adapter->stats.mpc;
1694
1695         /* see above
1696          * netdev->stats.rx_length_errors = adapter->stats.rlec;
1697          */
1698
1699         netdev->stats.rx_crc_errors = adapter->stats.crcerrs;
1700         netdev->stats.rx_fifo_errors = adapter->stats.mpc;
1701         netdev->stats.rx_missed_errors = adapter->stats.mpc;
1702         netdev->stats.rx_over_errors = adapter->stats.mpc;
1703
1704         netdev->stats.tx_errors = 0;
1705         netdev->stats.rx_frame_errors = 0;
1706         netdev->stats.tx_aborted_errors = 0;
1707         netdev->stats.tx_carrier_errors = 0;
1708         netdev->stats.tx_fifo_errors = 0;
1709         netdev->stats.tx_heartbeat_errors = 0;
1710         netdev->stats.tx_window_errors = 0;
1711 }
1712
1713 #define IXGB_MAX_INTR 10
1714 /**
1715  * ixgb_intr - Interrupt Handler
1716  * @irq: interrupt number
1717  * @data: pointer to a network interface device structure
1718  **/
1719
1720 static irqreturn_t
1721 ixgb_intr(int irq, void *data)
1722 {
1723         struct net_device *netdev = data;
1724         struct ixgb_adapter *adapter = netdev_priv(netdev);
1725         struct ixgb_hw *hw = &adapter->hw;
1726         u32 icr = IXGB_READ_REG(hw, ICR);
1727
1728         if (unlikely(!icr))
1729                 return IRQ_NONE;  /* Not our interrupt */
1730
1731         if (unlikely(icr & (IXGB_INT_RXSEQ | IXGB_INT_LSC)))
1732                 if (!test_bit(__IXGB_DOWN, &adapter->flags))
1733                         mod_timer(&adapter->watchdog_timer, jiffies);
1734
1735         if (napi_schedule_prep(&adapter->napi)) {
1736
1737                 /* Disable interrupts and register for poll. The flush
1738                   of the posted write is intentionally left out.
1739                 */
1740
1741                 IXGB_WRITE_REG(&adapter->hw, IMC, ~0);
1742                 __napi_schedule(&adapter->napi);
1743         }
1744         return IRQ_HANDLED;
1745 }
1746
1747 /**
1748  * ixgb_clean - NAPI Rx polling callback
1749  * @adapter: board private structure
1750  **/
1751
1752 static int
1753 ixgb_clean(struct napi_struct *napi, int budget)
1754 {
1755         struct ixgb_adapter *adapter = container_of(napi, struct ixgb_adapter, napi);
1756         int work_done = 0;
1757
1758         ixgb_clean_tx_irq(adapter);
1759         ixgb_clean_rx_irq(adapter, &work_done, budget);
1760
1761         /* If budget not fully consumed, exit the polling mode */
1762         if (work_done < budget) {
1763                 napi_complete_done(napi, work_done);
1764                 if (!test_bit(__IXGB_DOWN, &adapter->flags))
1765                         ixgb_irq_enable(adapter);
1766         }
1767
1768         return work_done;
1769 }
1770
1771 /**
1772  * ixgb_clean_tx_irq - Reclaim resources after transmit completes
1773  * @adapter: board private structure
1774  **/
1775
1776 static bool
1777 ixgb_clean_tx_irq(struct ixgb_adapter *adapter)
1778 {
1779         struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
1780         struct net_device *netdev = adapter->netdev;
1781         struct ixgb_tx_desc *tx_desc, *eop_desc;
1782         struct ixgb_buffer *buffer_info;
1783         unsigned int i, eop;
1784         bool cleaned = false;
1785
1786         i = tx_ring->next_to_clean;
1787         eop = tx_ring->buffer_info[i].next_to_watch;
1788         eop_desc = IXGB_TX_DESC(*tx_ring, eop);
1789
1790         while (eop_desc->status & IXGB_TX_DESC_STATUS_DD) {
1791
1792                 rmb(); /* read buffer_info after eop_desc */
1793                 for (cleaned = false; !cleaned; ) {
1794                         tx_desc = IXGB_TX_DESC(*tx_ring, i);
1795                         buffer_info = &tx_ring->buffer_info[i];
1796
1797                         if (tx_desc->popts &
1798                            (IXGB_TX_DESC_POPTS_TXSM |
1799                             IXGB_TX_DESC_POPTS_IXSM))
1800                                 adapter->hw_csum_tx_good++;
1801
1802                         ixgb_unmap_and_free_tx_resource(adapter, buffer_info);
1803
1804                         *(u32 *)&(tx_desc->status) = 0;
1805
1806                         cleaned = (i == eop);
1807                         if (++i == tx_ring->count) i = 0;
1808                 }
1809
1810                 eop = tx_ring->buffer_info[i].next_to_watch;
1811                 eop_desc = IXGB_TX_DESC(*tx_ring, eop);
1812         }
1813
1814         tx_ring->next_to_clean = i;
1815
1816         if (unlikely(cleaned && netif_carrier_ok(netdev) &&
1817                      IXGB_DESC_UNUSED(tx_ring) >= DESC_NEEDED)) {
1818                 /* Make sure that anybody stopping the queue after this
1819                  * sees the new next_to_clean. */
1820                 smp_mb();
1821
1822                 if (netif_queue_stopped(netdev) &&
1823                     !(test_bit(__IXGB_DOWN, &adapter->flags))) {
1824                         netif_wake_queue(netdev);
1825                         ++adapter->restart_queue;
1826                 }
1827         }
1828
1829         if (adapter->detect_tx_hung) {
1830                 /* detect a transmit hang in hardware, this serializes the
1831                  * check with the clearing of time_stamp and movement of i */
1832                 adapter->detect_tx_hung = false;
1833                 if (tx_ring->buffer_info[eop].time_stamp &&
1834                    time_after(jiffies, tx_ring->buffer_info[eop].time_stamp + HZ)
1835                    && !(IXGB_READ_REG(&adapter->hw, STATUS) &
1836                         IXGB_STATUS_TXOFF)) {
1837                         /* detected Tx unit hang */
1838                         netif_err(adapter, drv, adapter->netdev,
1839                                   "Detected Tx Unit Hang\n"
1840                                   "  TDH                  <%x>\n"
1841                                   "  TDT                  <%x>\n"
1842                                   "  next_to_use          <%x>\n"
1843                                   "  next_to_clean        <%x>\n"
1844                                   "buffer_info[next_to_clean]\n"
1845                                   "  time_stamp           <%lx>\n"
1846                                   "  next_to_watch        <%x>\n"
1847                                   "  jiffies              <%lx>\n"
1848                                   "  next_to_watch.status <%x>\n",
1849                                   IXGB_READ_REG(&adapter->hw, TDH),
1850                                   IXGB_READ_REG(&adapter->hw, TDT),
1851                                   tx_ring->next_to_use,
1852                                   tx_ring->next_to_clean,
1853                                   tx_ring->buffer_info[eop].time_stamp,
1854                                   eop,
1855                                   jiffies,
1856                                   eop_desc->status);
1857                         netif_stop_queue(netdev);
1858                 }
1859         }
1860
1861         return cleaned;
1862 }
1863
1864 /**
1865  * ixgb_rx_checksum - Receive Checksum Offload for 82597.
1866  * @adapter: board private structure
1867  * @rx_desc: receive descriptor
1868  * @sk_buff: socket buffer with received data
1869  **/
1870
1871 static void
1872 ixgb_rx_checksum(struct ixgb_adapter *adapter,
1873                  struct ixgb_rx_desc *rx_desc,
1874                  struct sk_buff *skb)
1875 {
1876         /* Ignore Checksum bit is set OR
1877          * TCP Checksum has not been calculated
1878          */
1879         if ((rx_desc->status & IXGB_RX_DESC_STATUS_IXSM) ||
1880            (!(rx_desc->status & IXGB_RX_DESC_STATUS_TCPCS))) {
1881                 skb_checksum_none_assert(skb);
1882                 return;
1883         }
1884
1885         /* At this point we know the hardware did the TCP checksum */
1886         /* now look at the TCP checksum error bit */
1887         if (rx_desc->errors & IXGB_RX_DESC_ERRORS_TCPE) {
1888                 /* let the stack verify checksum errors */
1889                 skb_checksum_none_assert(skb);
1890                 adapter->hw_csum_rx_error++;
1891         } else {
1892                 /* TCP checksum is good */
1893                 skb->ip_summed = CHECKSUM_UNNECESSARY;
1894                 adapter->hw_csum_rx_good++;
1895         }
1896 }
1897
1898 /*
1899  * this should improve performance for small packets with large amounts
1900  * of reassembly being done in the stack
1901  */
1902 static void ixgb_check_copybreak(struct napi_struct *napi,
1903                                  struct ixgb_buffer *buffer_info,
1904                                  u32 length, struct sk_buff **skb)
1905 {
1906         struct sk_buff *new_skb;
1907
1908         if (length > copybreak)
1909                 return;
1910
1911         new_skb = napi_alloc_skb(napi, length);
1912         if (!new_skb)
1913                 return;
1914
1915         skb_copy_to_linear_data_offset(new_skb, -NET_IP_ALIGN,
1916                                        (*skb)->data - NET_IP_ALIGN,
1917                                        length + NET_IP_ALIGN);
1918         /* save the skb in buffer_info as good */
1919         buffer_info->skb = *skb;
1920         *skb = new_skb;
1921 }
1922
1923 /**
1924  * ixgb_clean_rx_irq - Send received data up the network stack,
1925  * @adapter: board private structure
1926  **/
1927
1928 static bool
1929 ixgb_clean_rx_irq(struct ixgb_adapter *adapter, int *work_done, int work_to_do)
1930 {
1931         struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
1932         struct net_device *netdev = adapter->netdev;
1933         struct pci_dev *pdev = adapter->pdev;
1934         struct ixgb_rx_desc *rx_desc, *next_rxd;
1935         struct ixgb_buffer *buffer_info, *next_buffer, *next2_buffer;
1936         u32 length;
1937         unsigned int i, j;
1938         int cleaned_count = 0;
1939         bool cleaned = false;
1940
1941         i = rx_ring->next_to_clean;
1942         rx_desc = IXGB_RX_DESC(*rx_ring, i);
1943         buffer_info = &rx_ring->buffer_info[i];
1944
1945         while (rx_desc->status & IXGB_RX_DESC_STATUS_DD) {
1946                 struct sk_buff *skb;
1947                 u8 status;
1948
1949                 if (*work_done >= work_to_do)
1950                         break;
1951
1952                 (*work_done)++;
1953                 rmb();  /* read descriptor and rx_buffer_info after status DD */
1954                 status = rx_desc->status;
1955                 skb = buffer_info->skb;
1956                 buffer_info->skb = NULL;
1957
1958                 prefetch(skb->data - NET_IP_ALIGN);
1959
1960                 if (++i == rx_ring->count)
1961                         i = 0;
1962                 next_rxd = IXGB_RX_DESC(*rx_ring, i);
1963                 prefetch(next_rxd);
1964
1965                 j = i + 1;
1966                 if (j == rx_ring->count)
1967                         j = 0;
1968                 next2_buffer = &rx_ring->buffer_info[j];
1969                 prefetch(next2_buffer);
1970
1971                 next_buffer = &rx_ring->buffer_info[i];
1972
1973                 cleaned = true;
1974                 cleaned_count++;
1975
1976                 dma_unmap_single(&pdev->dev,
1977                                  buffer_info->dma,
1978                                  buffer_info->length,
1979                                  DMA_FROM_DEVICE);
1980                 buffer_info->dma = 0;
1981
1982                 length = le16_to_cpu(rx_desc->length);
1983                 rx_desc->length = 0;
1984
1985                 if (unlikely(!(status & IXGB_RX_DESC_STATUS_EOP))) {
1986
1987                         /* All receives must fit into a single buffer */
1988
1989                         pr_debug("Receive packet consumed multiple buffers length<%x>\n",
1990                                  length);
1991
1992                         dev_kfree_skb_irq(skb);
1993                         goto rxdesc_done;
1994                 }
1995
1996                 if (unlikely(rx_desc->errors &
1997                     (IXGB_RX_DESC_ERRORS_CE | IXGB_RX_DESC_ERRORS_SE |
1998                      IXGB_RX_DESC_ERRORS_P | IXGB_RX_DESC_ERRORS_RXE))) {
1999                         dev_kfree_skb_irq(skb);
2000                         goto rxdesc_done;
2001                 }
2002
2003                 ixgb_check_copybreak(&adapter->napi, buffer_info, length, &skb);
2004
2005                 /* Good Receive */
2006                 skb_put(skb, length);
2007
2008                 /* Receive Checksum Offload */
2009                 ixgb_rx_checksum(adapter, rx_desc, skb);
2010
2011                 skb->protocol = eth_type_trans(skb, netdev);
2012                 if (status & IXGB_RX_DESC_STATUS_VP)
2013                         __vlan_hwaccel_put_tag(skb, htons(ETH_P_8021Q),
2014                                        le16_to_cpu(rx_desc->special));
2015
2016                 netif_receive_skb(skb);
2017
2018 rxdesc_done:
2019                 /* clean up descriptor, might be written over by hw */
2020                 rx_desc->status = 0;
2021
2022                 /* return some buffers to hardware, one at a time is too slow */
2023                 if (unlikely(cleaned_count >= IXGB_RX_BUFFER_WRITE)) {
2024                         ixgb_alloc_rx_buffers(adapter, cleaned_count);
2025                         cleaned_count = 0;
2026                 }
2027
2028                 /* use prefetched values */
2029                 rx_desc = next_rxd;
2030                 buffer_info = next_buffer;
2031         }
2032
2033         rx_ring->next_to_clean = i;
2034
2035         cleaned_count = IXGB_DESC_UNUSED(rx_ring);
2036         if (cleaned_count)
2037                 ixgb_alloc_rx_buffers(adapter, cleaned_count);
2038
2039         return cleaned;
2040 }
2041
2042 /**
2043  * ixgb_alloc_rx_buffers - Replace used receive buffers
2044  * @adapter: address of board private structure
2045  **/
2046
2047 static void
2048 ixgb_alloc_rx_buffers(struct ixgb_adapter *adapter, int cleaned_count)
2049 {
2050         struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
2051         struct net_device *netdev = adapter->netdev;
2052         struct pci_dev *pdev = adapter->pdev;
2053         struct ixgb_rx_desc *rx_desc;
2054         struct ixgb_buffer *buffer_info;
2055         struct sk_buff *skb;
2056         unsigned int i;
2057         long cleancount;
2058
2059         i = rx_ring->next_to_use;
2060         buffer_info = &rx_ring->buffer_info[i];
2061         cleancount = IXGB_DESC_UNUSED(rx_ring);
2062
2063
2064         /* leave three descriptors unused */
2065         while (--cleancount > 2 && cleaned_count--) {
2066                 /* recycle! its good for you */
2067                 skb = buffer_info->skb;
2068                 if (skb) {
2069                         skb_trim(skb, 0);
2070                         goto map_skb;
2071                 }
2072
2073                 skb = netdev_alloc_skb_ip_align(netdev, adapter->rx_buffer_len);
2074                 if (unlikely(!skb)) {
2075                         /* Better luck next round */
2076                         adapter->alloc_rx_buff_failed++;
2077                         break;
2078                 }
2079
2080                 buffer_info->skb = skb;
2081                 buffer_info->length = adapter->rx_buffer_len;
2082 map_skb:
2083                 buffer_info->dma = dma_map_single(&pdev->dev,
2084                                                   skb->data,
2085                                                   adapter->rx_buffer_len,
2086                                                   DMA_FROM_DEVICE);
2087                 if (dma_mapping_error(&pdev->dev, buffer_info->dma)) {
2088                         adapter->alloc_rx_buff_failed++;
2089                         break;
2090                 }
2091
2092                 rx_desc = IXGB_RX_DESC(*rx_ring, i);
2093                 rx_desc->buff_addr = cpu_to_le64(buffer_info->dma);
2094                 /* guarantee DD bit not set now before h/w gets descriptor
2095                  * this is the rest of the workaround for h/w double
2096                  * writeback. */
2097                 rx_desc->status = 0;
2098
2099
2100                 if (++i == rx_ring->count)
2101                         i = 0;
2102                 buffer_info = &rx_ring->buffer_info[i];
2103         }
2104
2105         if (likely(rx_ring->next_to_use != i)) {
2106                 rx_ring->next_to_use = i;
2107                 if (unlikely(i-- == 0))
2108                         i = (rx_ring->count - 1);
2109
2110                 /* Force memory writes to complete before letting h/w
2111                  * know there are new descriptors to fetch.  (Only
2112                  * applicable for weak-ordered memory model archs, such
2113                  * as IA-64). */
2114                 wmb();
2115                 IXGB_WRITE_REG(&adapter->hw, RDT, i);
2116         }
2117 }
2118
2119 static void
2120 ixgb_vlan_strip_enable(struct ixgb_adapter *adapter)
2121 {
2122         u32 ctrl;
2123
2124         /* enable VLAN tag insert/strip */
2125         ctrl = IXGB_READ_REG(&adapter->hw, CTRL0);
2126         ctrl |= IXGB_CTRL0_VME;
2127         IXGB_WRITE_REG(&adapter->hw, CTRL0, ctrl);
2128 }
2129
2130 static void
2131 ixgb_vlan_strip_disable(struct ixgb_adapter *adapter)
2132 {
2133         u32 ctrl;
2134
2135         /* disable VLAN tag insert/strip */
2136         ctrl = IXGB_READ_REG(&adapter->hw, CTRL0);
2137         ctrl &= ~IXGB_CTRL0_VME;
2138         IXGB_WRITE_REG(&adapter->hw, CTRL0, ctrl);
2139 }
2140
2141 static int
2142 ixgb_vlan_rx_add_vid(struct net_device *netdev, __be16 proto, u16 vid)
2143 {
2144         struct ixgb_adapter *adapter = netdev_priv(netdev);
2145         u32 vfta, index;
2146
2147         /* add VID to filter table */
2148
2149         index = (vid >> 5) & 0x7F;
2150         vfta = IXGB_READ_REG_ARRAY(&adapter->hw, VFTA, index);
2151         vfta |= (1 << (vid & 0x1F));
2152         ixgb_write_vfta(&adapter->hw, index, vfta);
2153         set_bit(vid, adapter->active_vlans);
2154
2155         return 0;
2156 }
2157
2158 static int
2159 ixgb_vlan_rx_kill_vid(struct net_device *netdev, __be16 proto, u16 vid)
2160 {
2161         struct ixgb_adapter *adapter = netdev_priv(netdev);
2162         u32 vfta, index;
2163
2164         /* remove VID from filter table */
2165
2166         index = (vid >> 5) & 0x7F;
2167         vfta = IXGB_READ_REG_ARRAY(&adapter->hw, VFTA, index);
2168         vfta &= ~(1 << (vid & 0x1F));
2169         ixgb_write_vfta(&adapter->hw, index, vfta);
2170         clear_bit(vid, adapter->active_vlans);
2171
2172         return 0;
2173 }
2174
2175 static void
2176 ixgb_restore_vlan(struct ixgb_adapter *adapter)
2177 {
2178         u16 vid;
2179
2180         for_each_set_bit(vid, adapter->active_vlans, VLAN_N_VID)
2181                 ixgb_vlan_rx_add_vid(adapter->netdev, htons(ETH_P_8021Q), vid);
2182 }
2183
2184 /**
2185  * ixgb_io_error_detected - called when PCI error is detected
2186  * @pdev:    pointer to pci device with error
2187  * @state:   pci channel state after error
2188  *
2189  * This callback is called by the PCI subsystem whenever
2190  * a PCI bus error is detected.
2191  */
2192 static pci_ers_result_t ixgb_io_error_detected(struct pci_dev *pdev,
2193                                                enum pci_channel_state state)
2194 {
2195         struct net_device *netdev = pci_get_drvdata(pdev);
2196         struct ixgb_adapter *adapter = netdev_priv(netdev);
2197
2198         netif_device_detach(netdev);
2199
2200         if (state == pci_channel_io_perm_failure)
2201                 return PCI_ERS_RESULT_DISCONNECT;
2202
2203         if (netif_running(netdev))
2204                 ixgb_down(adapter, true);
2205
2206         pci_disable_device(pdev);
2207
2208         /* Request a slot reset. */
2209         return PCI_ERS_RESULT_NEED_RESET;
2210 }
2211
2212 /**
2213  * ixgb_io_slot_reset - called after the pci bus has been reset.
2214  * @pdev    pointer to pci device with error
2215  *
2216  * This callback is called after the PCI bus has been reset.
2217  * Basically, this tries to restart the card from scratch.
2218  * This is a shortened version of the device probe/discovery code,
2219  * it resembles the first-half of the ixgb_probe() routine.
2220  */
2221 static pci_ers_result_t ixgb_io_slot_reset(struct pci_dev *pdev)
2222 {
2223         struct net_device *netdev = pci_get_drvdata(pdev);
2224         struct ixgb_adapter *adapter = netdev_priv(netdev);
2225
2226         if (pci_enable_device(pdev)) {
2227                 netif_err(adapter, probe, adapter->netdev,
2228                           "Cannot re-enable PCI device after reset\n");
2229                 return PCI_ERS_RESULT_DISCONNECT;
2230         }
2231
2232         /* Perform card reset only on one instance of the card */
2233         if (0 != PCI_FUNC (pdev->devfn))
2234                 return PCI_ERS_RESULT_RECOVERED;
2235
2236         pci_set_master(pdev);
2237
2238         netif_carrier_off(netdev);
2239         netif_stop_queue(netdev);
2240         ixgb_reset(adapter);
2241
2242         /* Make sure the EEPROM is good */
2243         if (!ixgb_validate_eeprom_checksum(&adapter->hw)) {
2244                 netif_err(adapter, probe, adapter->netdev,
2245                           "After reset, the EEPROM checksum is not valid\n");
2246                 return PCI_ERS_RESULT_DISCONNECT;
2247         }
2248         ixgb_get_ee_mac_addr(&adapter->hw, netdev->dev_addr);
2249         memcpy(netdev->perm_addr, netdev->dev_addr, netdev->addr_len);
2250
2251         if (!is_valid_ether_addr(netdev->perm_addr)) {
2252                 netif_err(adapter, probe, adapter->netdev,
2253                           "After reset, invalid MAC address\n");
2254                 return PCI_ERS_RESULT_DISCONNECT;
2255         }
2256
2257         return PCI_ERS_RESULT_RECOVERED;
2258 }
2259
2260 /**
2261  * ixgb_io_resume - called when its OK to resume normal operations
2262  * @pdev    pointer to pci device with error
2263  *
2264  * The error recovery driver tells us that its OK to resume
2265  * normal operation. Implementation resembles the second-half
2266  * of the ixgb_probe() routine.
2267  */
2268 static void ixgb_io_resume(struct pci_dev *pdev)
2269 {
2270         struct net_device *netdev = pci_get_drvdata(pdev);
2271         struct ixgb_adapter *adapter = netdev_priv(netdev);
2272
2273         pci_set_master(pdev);
2274
2275         if (netif_running(netdev)) {
2276                 if (ixgb_up(adapter)) {
2277                         pr_err("can't bring device back up after reset\n");
2278                         return;
2279                 }
2280         }
2281
2282         netif_device_attach(netdev);
2283         mod_timer(&adapter->watchdog_timer, jiffies);
2284 }
2285
2286 /* ixgb_main.c */