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