drivers/net/ixgb/ixgb_main.c

   1 /*******************************************************************************
   2
   3   Intel PRO/10GbE Linux driver
   4   Copyright(c) 1999 - 2008 Intel Corporation.
   5
   6   This program is free software; you can redistribute it and/or modify it
   7   under the terms and conditions of the GNU General Public License,
   8   version 2, as published by the Free Software Foundation.
   9
  10   This program is distributed in the hope it will be useful, but WITHOUT
  11   ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  12   FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  13   more details.
  14
  15   You should have received a copy of the GNU General Public License along with
  16   this program; if not, write to the Free Software Foundation, Inc.,
  17   51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
  18
  19   The full GNU General Public License is included in this distribution in
  20   the file called "COPYING".
  21
  22   Contact Information:
  23   Linux NICS <linux.nics@intel.com>
  24   e1000-devel Mailing List <e1000-devel@lists.sourceforge.net>
  25   Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
  26
  27 *******************************************************************************/
  28
  29 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  30
  31 #include "ixgb.h"
  32
  33 char ixgb_driver_name[] = "ixgb";
  34 static char ixgb_driver_string[] = "Intel(R) PRO/10GbE Network Driver";
  35
  36 #define DRIVERNAPI "-NAPI"
  37 #define DRV_VERSION "1.0.135-k2" DRIVERNAPI
  38 const char ixgb_driver_version[] = DRV_VERSION;
  39 static const char ixgb_copyright[] = "Copyright (c) 1999-2008 Intel Corporation.";
  40
  41 #define IXGB_CB_LENGTH 256
  42 static unsigned int copybreak __read_mostly = IXGB_CB_LENGTH;
  43 module_param(copybreak, uint, 0644);
  44 MODULE_PARM_DESC(copybreak,
  45         "Maximum size of packet that is copied to a new buffer on receive");
  46
  47 /* ixgb_pci_tbl - PCI Device ID Table
  48  *
  49  * Wildcard entries (PCI_ANY_ID) should come last
  50  * Last entry must be all 0s
  51  *
  52  * { Vendor ID, Device ID, SubVendor ID, SubDevice ID,
  53  *   Class, Class Mask, private data (not used) }
  54  */
  55 static DEFINE_PCI_DEVICE_TABLE(ixgb_pci_tbl) = {
  56         {INTEL_VENDOR_ID, IXGB_DEVICE_ID_82597EX,
  57          PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
  58         {INTEL_VENDOR_ID, IXGB_DEVICE_ID_82597EX_CX4,
  59          PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
  60         {INTEL_VENDOR_ID, IXGB_DEVICE_ID_82597EX_SR,
  61          PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
  62         {INTEL_VENDOR_ID, IXGB_DEVICE_ID_82597EX_LR,
  63          PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
  64
  65         /* required last entry */
  66         {0,}
  67 };
  68
  69 MODULE_DEVICE_TABLE(pci, ixgb_pci_tbl);
  70
  71 /* Local Function Prototypes */
  72 static int ixgb_init_module(void);
  73 static void ixgb_exit_module(void);
  74 static int ixgb_probe(struct pci_dev *pdev, const struct pci_device_id *ent);
  75 static void __devexit ixgb_remove(struct pci_dev *pdev);
  76 static int ixgb_sw_init(struct ixgb_adapter *adapter);
  77 static int ixgb_open(struct net_device *netdev);
  78 static int ixgb_close(struct net_device *netdev);
  79 static void ixgb_configure_tx(struct ixgb_adapter *adapter);
  80 static void ixgb_configure_rx(struct ixgb_adapter *adapter);
  81 static void ixgb_setup_rctl(struct ixgb_adapter *adapter);
  82 static void ixgb_clean_tx_ring(struct ixgb_adapter *adapter);
  83 static void ixgb_clean_rx_ring(struct ixgb_adapter *adapter);
  84 static void ixgb_set_multi(struct net_device *netdev);
  85 static void ixgb_watchdog(unsigned long data);
  86 static netdev_tx_t ixgb_xmit_frame(struct sk_buff *skb,
  87                                    struct net_device *netdev);
  88 static struct net_device_stats *ixgb_get_stats(struct net_device *netdev);
  89 static int ixgb_change_mtu(struct net_device *netdev, int new_mtu);
  90 static int ixgb_set_mac(struct net_device *netdev, void *p);
  91 static irqreturn_t ixgb_intr(int irq, void *data);
  92 static bool ixgb_clean_tx_irq(struct ixgb_adapter *adapter);
  93
  94 static int ixgb_clean(struct napi_struct *, int);
  95 static bool ixgb_clean_rx_irq(struct ixgb_adapter *, int *, int);
  96 static void ixgb_alloc_rx_buffers(struct ixgb_adapter *, int);
  97
  98 static void ixgb_tx_timeout(struct net_device *dev);
  99 static void ixgb_tx_timeout_task(struct work_struct *work);
 100
 101 static void ixgb_vlan_rx_register(struct net_device *netdev,
 102                                   struct vlan_group *grp);
 103 static void ixgb_vlan_rx_add_vid(struct net_device *netdev, u16 vid);
 104 static void ixgb_vlan_rx_kill_vid(struct net_device *netdev, u16 vid);
 105 static void ixgb_restore_vlan(struct ixgb_adapter *adapter);
 106
 107 #ifdef CONFIG_NET_POLL_CONTROLLER
 108 /* for netdump / net console */
 109 static void ixgb_netpoll(struct net_device *dev);
 110 #endif
 111
 112 static pci_ers_result_t ixgb_io_error_detected (struct pci_dev *pdev,
 113                              enum pci_channel_state state);
 114 static pci_ers_result_t ixgb_io_slot_reset (struct pci_dev *pdev);
 115 static void ixgb_io_resume (struct pci_dev *pdev);
 116
 117 static struct pci_error_handlers ixgb_err_handler = {
 118         .error_detected = ixgb_io_error_detected,
 119         .slot_reset = ixgb_io_slot_reset,
 120         .resume = ixgb_io_resume,
 121 };
 122
 123 static struct pci_driver ixgb_driver = {
 124         .name     = ixgb_driver_name,
 125         .id_table = ixgb_pci_tbl,
 126         .probe    = ixgb_probe,
 127         .remove   = __devexit_p(ixgb_remove),
 128         .err_handler = &ixgb_err_handler
 129 };
 130
 131 MODULE_AUTHOR("Intel Corporation, <linux.nics@intel.com>");
 132 MODULE_DESCRIPTION("Intel(R) PRO/10GbE Network Driver");
 133 MODULE_LICENSE("GPL");
 134 MODULE_VERSION(DRV_VERSION);
 135
 136 #define DEFAULT_DEBUG_LEVEL_SHIFT 3
 137 static int debug = DEFAULT_DEBUG_LEVEL_SHIFT;
 138 module_param(debug, int, 0);
 139 MODULE_PARM_DESC(debug, "Debug level (0=none,...,16=all)");
 140
 141 /**
 142  * ixgb_init_module - Driver Registration Routine
 143  *
 144  * ixgb_init_module is the first routine called when the driver is
 145  * loaded. All it does is register with the PCI subsystem.
 146  **/
 147
 148 static int __init
 149 ixgb_init_module(void)
 150 {
 151         pr_info("%s - version %s\n", ixgb_driver_string, ixgb_driver_version);
 152         pr_info("%s\n", ixgb_copyright);
 153
 154         return pci_register_driver(&ixgb_driver);
 155 }
 156
 157 module_init(ixgb_init_module);
 158
 159 /**
 160  * ixgb_exit_module - Driver Exit Cleanup Routine
 161  *
 162  * ixgb_exit_module is called just before the driver is removed
 163  * from memory.
 164  **/
 165
 166 static void __exit
 167 ixgb_exit_module(void)
 168 {
 169         pci_unregister_driver(&ixgb_driver);
 170 }
 171
 172 module_exit(ixgb_exit_module);
 173
 174 /**
 175  * ixgb_irq_disable - Mask off interrupt generation on the NIC
 176  * @adapter: board private structure
 177  **/
 178
 179 static void
 180 ixgb_irq_disable(struct ixgb_adapter *adapter)
 181 {
 182         IXGB_WRITE_REG(&adapter->hw, IMC, ~0);
 183         IXGB_WRITE_FLUSH(&adapter->hw);
 184         synchronize_irq(adapter->pdev->irq);
 185 }
 186
 187 /**
 188  * ixgb_irq_enable - Enable default interrupt generation settings
 189  * @adapter: board private structure
 190  **/
 191
 192 static void
 193 ixgb_irq_enable(struct ixgb_adapter *adapter)
 194 {
 195         u32 val = IXGB_INT_RXT0 | IXGB_INT_RXDMT0 |
 196                   IXGB_INT_TXDW | IXGB_INT_LSC;
 197         if (adapter->hw.subsystem_vendor_id == SUN_SUBVENDOR_ID)
 198                 val |= IXGB_INT_GPI0;
 199         IXGB_WRITE_REG(&adapter->hw, IMS, val);
 200         IXGB_WRITE_FLUSH(&adapter->hw);
 201 }
 202
 203 int
 204 ixgb_up(struct ixgb_adapter *adapter)
 205 {
 206         struct net_device *netdev = adapter->netdev;
 207         int err, irq_flags = IRQF_SHARED;
 208         int max_frame = netdev->mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;
 209         struct ixgb_hw *hw = &adapter->hw;
 210
 211         /* hardware has been reset, we need to reload some things */
 212
 213         ixgb_rar_set(hw, netdev->dev_addr, 0);
 214         ixgb_set_multi(netdev);
 215
 216         ixgb_restore_vlan(adapter);
 217
 218         ixgb_configure_tx(adapter);
 219         ixgb_setup_rctl(adapter);
 220         ixgb_configure_rx(adapter);
 221         ixgb_alloc_rx_buffers(adapter, IXGB_DESC_UNUSED(&adapter->rx_ring));
 222
 223         /* disable interrupts and get the hardware into a known state */
 224         IXGB_WRITE_REG(&adapter->hw, IMC, 0xffffffff);
 225
 226         /* only enable MSI if bus is in PCI-X mode */
 227         if (IXGB_READ_REG(&adapter->hw, STATUS) & IXGB_STATUS_PCIX_MODE) {
 228                 err = pci_enable_msi(adapter->pdev);
 229                 if (!err) {
 230                         adapter->have_msi = 1;
 231                         irq_flags = 0;
 232                 }
 233                 /* proceed to try to request regular interrupt */
 234         }
 235
 236         err = request_irq(adapter->pdev->irq, ixgb_intr, irq_flags,
 237                           netdev->name, netdev);
 238         if (err) {
 239                 if (adapter->have_msi)
 240                         pci_disable_msi(adapter->pdev);
 241                 netif_err(adapter, probe, adapter->netdev,
 242                           "Unable to allocate interrupt Error: %d\n", err);
 243                 return err;
 244         }
 245
 246         if ((hw->max_frame_size != max_frame) ||
 247                 (hw->max_frame_size !=
 248                 (IXGB_READ_REG(hw, MFS) >> IXGB_MFS_SHIFT))) {
 249
 250                 hw->max_frame_size = max_frame;
 251
 252                 IXGB_WRITE_REG(hw, MFS, hw->max_frame_size << IXGB_MFS_SHIFT);
 253
 254                 if (hw->max_frame_size >
 255                    IXGB_MAX_ENET_FRAME_SIZE_WITHOUT_FCS + ENET_FCS_LENGTH) {
 256                         u32 ctrl0 = IXGB_READ_REG(hw, CTRL0);
 257
 258                         if (!(ctrl0 & IXGB_CTRL0_JFE)) {
 259                                 ctrl0 |= IXGB_CTRL0_JFE;
 260                                 IXGB_WRITE_REG(hw, CTRL0, ctrl0);
 261                         }
 262                 }
 263         }
 264
 265         clear_bit(__IXGB_DOWN, &adapter->flags);
 266
 267         napi_enable(&adapter->napi);
 268         ixgb_irq_enable(adapter);
 269
 270         netif_wake_queue(netdev);
 271
 272         mod_timer(&adapter->watchdog_timer, jiffies);
 273
 274         return 0;
 275 }
 276
 277 void
 278 ixgb_down(struct ixgb_adapter *adapter, bool kill_watchdog)
 279 {
 280         struct net_device *netdev = adapter->netdev;
 281
 282         /* prevent the interrupt handler from restarting watchdog */
 283         set_bit(__IXGB_DOWN, &adapter->flags);
 284
 285         napi_disable(&adapter->napi);
 286         /* waiting for NAPI to complete can re-enable interrupts */
 287         ixgb_irq_disable(adapter);
 288         free_irq(adapter->pdev->irq, netdev);
 289
 290         if (adapter->have_msi)
 291                 pci_disable_msi(adapter->pdev);
 292
 293         if (kill_watchdog)
 294                 del_timer_sync(&adapter->watchdog_timer);
 295
 296         adapter->link_speed = 0;
 297         adapter->link_duplex = 0;
 298         netif_carrier_off(netdev);
 299         netif_stop_queue(netdev);
 300
 301         ixgb_reset(adapter);
 302         ixgb_clean_tx_ring(adapter);
 303         ixgb_clean_rx_ring(adapter);
 304 }
 305
 306 void
 307 ixgb_reset(struct ixgb_adapter *adapter)
 308 {
 309         struct ixgb_hw *hw = &adapter->hw;
 310
 311         ixgb_adapter_stop(hw);
 312         if (!ixgb_init_hw(hw))
 313                 netif_err(adapter, probe, adapter->netdev, "ixgb_init_hw failed\n");
 314
 315         /* restore frame size information */
 316         IXGB_WRITE_REG(hw, MFS, hw->max_frame_size << IXGB_MFS_SHIFT);
 317         if (hw->max_frame_size >
 318             IXGB_MAX_ENET_FRAME_SIZE_WITHOUT_FCS + ENET_FCS_LENGTH) {
 319                 u32 ctrl0 = IXGB_READ_REG(hw, CTRL0);
 320                 if (!(ctrl0 & IXGB_CTRL0_JFE)) {
 321                         ctrl0 |= IXGB_CTRL0_JFE;
 322                         IXGB_WRITE_REG(hw, CTRL0, ctrl0);
 323                 }
 324         }
 325 }
 326
 327 static const struct net_device_ops ixgb_netdev_ops = {
 328         .ndo_open               = ixgb_open,
 329         .ndo_stop               = ixgb_close,
 330         .ndo_start_xmit         = ixgb_xmit_frame,
 331         .ndo_get_stats          = ixgb_get_stats,
 332         .ndo_set_multicast_list = ixgb_set_multi,
 333         .ndo_validate_addr      = eth_validate_addr,
 334         .ndo_set_mac_address    = ixgb_set_mac,
 335         .ndo_change_mtu         = ixgb_change_mtu,
 336         .ndo_tx_timeout         = ixgb_tx_timeout,
 337         .ndo_vlan_rx_register   = ixgb_vlan_rx_register,
 338         .ndo_vlan_rx_add_vid    = ixgb_vlan_rx_add_vid,
 339         .ndo_vlan_rx_kill_vid   = ixgb_vlan_rx_kill_vid,
 340 #ifdef CONFIG_NET_POLL_CONTROLLER
 341         .ndo_poll_controller    = ixgb_netpoll,
 342 #endif
 343 };
 344
 345 /**
 346  * ixgb_probe - Device Initialization Routine
 347  * @pdev: PCI device information struct
 348  * @ent: entry in ixgb_pci_tbl
 349  *
 350  * Returns 0 on success, negative on failure
 351  *
 352  * ixgb_probe initializes an adapter identified by a pci_dev structure.
 353  * The OS initialization, configuring of the adapter private structure,
 354  * and a hardware reset occur.
 355  **/
 356
 357 static int __devinit
 358 ixgb_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
 359 {
 360         struct net_device *netdev = NULL;
 361         struct ixgb_adapter *adapter;
 362         static int cards_found = 0;
 363         int pci_using_dac;
 364         int i;
 365         int err;
 366
 367         err = pci_enable_device(pdev);
 368         if (err)
 369                 return err;
 370
 371         pci_using_dac = 0;
 372         err = dma_set_mask(&pdev->dev, DMA_BIT_MASK(64));
 373         if (!err) {
 374                 err = dma_set_coherent_mask(&pdev->dev, DMA_BIT_MASK(64));
 375                 if (!err)
 376                         pci_using_dac = 1;
 377         } else {
 378                 err = dma_set_mask(&pdev->dev, DMA_BIT_MASK(32));
 379                 if (err) {
 380                         err = dma_set_coherent_mask(&pdev->dev,
 381                                                     DMA_BIT_MASK(32));
 382                         if (err) {
 383                                 pr_err("No usable DMA configuration, aborting\n");
 384                                 goto err_dma_mask;
 385                         }
 386                 }
 387         }
 388
 389         err = pci_request_regions(pdev, ixgb_driver_name);
 390         if (err)
 391                 goto err_request_regions;
 392
 393         pci_set_master(pdev);
 394
 395         netdev = alloc_etherdev(sizeof(struct ixgb_adapter));
 396         if (!netdev) {
 397                 err = -ENOMEM;
 398                 goto err_alloc_etherdev;
 399         }
 400
 401         SET_NETDEV_DEV(netdev, &pdev->dev);
 402
 403         pci_set_drvdata(pdev, netdev);
 404         adapter = netdev_priv(netdev);
 405         adapter->netdev = netdev;
 406         adapter->pdev = pdev;
 407         adapter->hw.back = adapter;
 408         adapter->msg_enable = netif_msg_init(debug, DEFAULT_DEBUG_LEVEL_SHIFT);
 409
 410         adapter->hw.hw_addr = pci_ioremap_bar(pdev, BAR_0);
 411         if (!adapter->hw.hw_addr) {
 412                 err = -EIO;
 413                 goto err_ioremap;
 414         }
 415
 416         for (i = BAR_1; i <= BAR_5; i++) {
 417                 if (pci_resource_len(pdev, i) == 0)
 418                         continue;
 419                 if (pci_resource_flags(pdev, i) & IORESOURCE_IO) {
 420                         adapter->hw.io_base = pci_resource_start(pdev, i);
 421                         break;
 422                 }
 423         }
 424
 425         netdev->netdev_ops = &ixgb_netdev_ops;
 426         ixgb_set_ethtool_ops(netdev);
 427         netdev->watchdog_timeo = 5 * HZ;
 428         netif_napi_add(netdev, &adapter->napi, ixgb_clean, 64);
 429
 430         strncpy(netdev->name, pci_name(pdev), sizeof(netdev->name) - 1);
 431
 432         adapter->bd_number = cards_found;
 433         adapter->link_speed = 0;
 434         adapter->link_duplex = 0;
 435
 436         /* setup the private structure */
 437
 438         err = ixgb_sw_init(adapter);
 439         if (err)
 440                 goto err_sw_init;
 441
 442         netdev->features = NETIF_F_SG |
 443                            NETIF_F_HW_CSUM |
 444                            NETIF_F_HW_VLAN_TX |
 445                            NETIF_F_HW_VLAN_RX |
 446                            NETIF_F_HW_VLAN_FILTER;
 447         netdev->features |= NETIF_F_TSO;
 448
 449         if (pci_using_dac)
 450                 netdev->features |= NETIF_F_HIGHDMA;
 451
 452         /* make sure the EEPROM is good */
 453
 454         if (!ixgb_validate_eeprom_checksum(&adapter->hw)) {
 455                 netif_err(adapter, probe, adapter->netdev,
 456                           "The EEPROM Checksum Is Not Valid\n");
 457                 err = -EIO;
 458                 goto err_eeprom;
 459         }
 460
 461         ixgb_get_ee_mac_addr(&adapter->hw, netdev->dev_addr);
 462         memcpy(netdev->perm_addr, netdev->dev_addr, netdev->addr_len);
 463
 464         if (!is_valid_ether_addr(netdev->perm_addr)) {
 465                 netif_err(adapter, probe, adapter->netdev, "Invalid MAC Address\n");
 466                 err = -EIO;
 467                 goto err_eeprom;
 468         }
 469
 470         adapter->part_num = ixgb_get_ee_pba_number(&adapter->hw);
 471
 472         init_timer(&adapter->watchdog_timer);
 473         adapter->watchdog_timer.function = &ixgb_watchdog;
 474         adapter->watchdog_timer.data = (unsigned long)adapter;
 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 __devexit
 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         flush_scheduled_work();
 527
 528         unregister_netdev(netdev);
 529
 530         iounmap(adapter->hw.hw_addr);
 531         pci_release_regions(pdev);
 532
 533         free_netdev(netdev);
 534 }
 535
 536 /**
 537  * ixgb_sw_init - Initialize general software structures (struct ixgb_adapter)
 538  * @adapter: board private structure to initialize
 539  *
 540  * ixgb_sw_init initializes the Adapter private data structure.
 541  * Fields are initialized based on PCI device information and
 542  * OS network device settings (MTU size).
 543  **/
 544
 545 static int __devinit
 546 ixgb_sw_init(struct ixgb_adapter *adapter)
 547 {
 548         struct ixgb_hw *hw = &adapter->hw;
 549         struct net_device *netdev = adapter->netdev;
 550         struct pci_dev *pdev = adapter->pdev;
 551
 552         /* PCI config space info */
 553
 554         hw->vendor_id = pdev->vendor;
 555         hw->device_id = pdev->device;
 556         hw->subsystem_vendor_id = pdev->subsystem_vendor;
 557         hw->subsystem_id = pdev->subsystem_device;
 558
 559         hw->max_frame_size = netdev->mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;
 560         adapter->rx_buffer_len = hw->max_frame_size + 8; /* + 8 for errata */
 561
 562         if ((hw->device_id == IXGB_DEVICE_ID_82597EX) ||
 563             (hw->device_id == IXGB_DEVICE_ID_82597EX_CX4) ||
 564             (hw->device_id == IXGB_DEVICE_ID_82597EX_LR) ||
 565             (hw->device_id == IXGB_DEVICE_ID_82597EX_SR))
 566                 hw->mac_type = ixgb_82597;
 567         else {
 568                 /* should never have loaded on this device */
 569                 netif_err(adapter, probe, adapter->netdev, "unsupported device id\n");
 570         }
 571
 572         /* enable flow control to be programmed */
 573         hw->fc.send_xon = 1;
 574
 575         set_bit(__IXGB_DOWN, &adapter->flags);
 576         return 0;
 577 }
 578
 579 /**
 580  * ixgb_open - Called when a network interface is made active
 581  * @netdev: network interface device structure
 582  *
 583  * Returns 0 on success, negative value on failure
 584  *
 585  * The open entry point is called when a network interface is made
 586  * active by the system (IFF_UP).  At this point all resources needed
 587  * for transmit and receive operations are allocated, the interrupt
 588  * handler is registered with the OS, the watchdog timer is started,
 589  * and the stack is notified that the interface is ready.
 590  **/
 591
 592 static int
 593 ixgb_open(struct net_device *netdev)
 594 {
 595         struct ixgb_adapter *adapter = netdev_priv(netdev);
 596         int err;
 597
 598         /* allocate transmit descriptors */
 599         err = ixgb_setup_tx_resources(adapter);
 600         if (err)
 601                 goto err_setup_tx;
 602
 603         netif_carrier_off(netdev);
 604
 605         /* allocate receive descriptors */
 606
 607         err = ixgb_setup_rx_resources(adapter);
 608         if (err)
 609                 goto err_setup_rx;
 610
 611         err = ixgb_up(adapter);
 612         if (err)
 613                 goto err_up;
 614
 615         netif_start_queue(netdev);
 616
 617         return 0;
 618
 619 err_up:
 620         ixgb_free_rx_resources(adapter);
 621 err_setup_rx:
 622         ixgb_free_tx_resources(adapter);
 623 err_setup_tx:
 624         ixgb_reset(adapter);
 625
 626         return err;
 627 }
 628
 629 /**
 630  * ixgb_close - Disables a network interface
 631  * @netdev: network interface device structure
 632  *
 633  * Returns 0, this is not allowed to fail
 634  *
 635  * The close entry point is called when an interface is de-activated
 636  * by the OS.  The hardware is still under the drivers control, but
 637  * needs to be disabled.  A global MAC reset is issued to stop the
 638  * hardware, and all transmit and receive resources are freed.
 639  **/
 640
 641 static int
 642 ixgb_close(struct net_device *netdev)
 643 {
 644         struct ixgb_adapter *adapter = netdev_priv(netdev);
 645
 646         ixgb_down(adapter, true);
 647
 648         ixgb_free_tx_resources(adapter);
 649         ixgb_free_rx_resources(adapter);
 650
 651         return 0;
 652 }
 653
 654 /**
 655  * ixgb_setup_tx_resources - allocate Tx resources (Descriptors)
 656  * @adapter: board private structure
 657  *
 658  * Return 0 on success, negative on failure
 659  **/
 660
 661 int
 662 ixgb_setup_tx_resources(struct ixgb_adapter *adapter)
 663 {
 664         struct ixgb_desc_ring *txdr = &adapter->tx_ring;
 665         struct pci_dev *pdev = adapter->pdev;
 666         int size;
 667
 668         size = sizeof(struct ixgb_buffer) * txdr->count;
 669         txdr->buffer_info = vmalloc(size);
 670         if (!txdr->buffer_info) {
 671                 netif_err(adapter, probe, adapter->netdev,
 672                           "Unable to allocate transmit descriptor ring memory\n");
 673                 return -ENOMEM;
 674         }
 675         memset(txdr->buffer_info, 0, size);
 676
 677         /* round up to nearest 4K */
 678
 679         txdr->size = txdr->count * sizeof(struct ixgb_tx_desc);
 680         txdr->size = ALIGN(txdr->size, 4096);
 681
 682         txdr->desc = dma_alloc_coherent(&pdev->dev, txdr->size, &txdr->dma,
 683                                         GFP_KERNEL);
 684         if (!txdr->desc) {
 685                 vfree(txdr->buffer_info);
 686                 netif_err(adapter, probe, adapter->netdev,
 687                           "Unable to allocate transmit descriptor memory\n");
 688                 return -ENOMEM;
 689         }
 690         memset(txdr->desc, 0, txdr->size);
 691
 692         txdr->next_to_use = 0;
 693         txdr->next_to_clean = 0;
 694
 695         return 0;
 696 }
 697
 698 /**
 699  * ixgb_configure_tx - Configure 82597 Transmit Unit after Reset.
 700  * @adapter: board private structure
 701  *
 702  * Configure the Tx unit of the MAC after a reset.
 703  **/
 704
 705 static void
 706 ixgb_configure_tx(struct ixgb_adapter *adapter)
 707 {
 708         u64 tdba = adapter->tx_ring.dma;
 709         u32 tdlen = adapter->tx_ring.count * sizeof(struct ixgb_tx_desc);
 710         u32 tctl;
 711         struct ixgb_hw *hw = &adapter->hw;
 712
 713         /* Setup the Base and Length of the Tx Descriptor Ring
 714          * tx_ring.dma can be either a 32 or 64 bit value
 715          */
 716
 717         IXGB_WRITE_REG(hw, TDBAL, (tdba & 0x00000000ffffffffULL));
 718         IXGB_WRITE_REG(hw, TDBAH, (tdba >> 32));
 719
 720         IXGB_WRITE_REG(hw, TDLEN, tdlen);
 721
 722         /* Setup the HW Tx Head and Tail descriptor pointers */
 723
 724         IXGB_WRITE_REG(hw, TDH, 0);
 725         IXGB_WRITE_REG(hw, TDT, 0);
 726
 727         /* don't set up txdctl, it induces performance problems if configured
 728          * incorrectly */
 729         /* Set the Tx Interrupt Delay register */
 730
 731         IXGB_WRITE_REG(hw, TIDV, adapter->tx_int_delay);
 732
 733         /* Program the Transmit Control Register */
 734
 735         tctl = IXGB_TCTL_TCE | IXGB_TCTL_TXEN | IXGB_TCTL_TPDE;
 736         IXGB_WRITE_REG(hw, TCTL, tctl);
 737
 738         /* Setup Transmit Descriptor Settings for this adapter */
 739         adapter->tx_cmd_type =
 740                 IXGB_TX_DESC_TYPE |
 741                 (adapter->tx_int_delay_enable ? IXGB_TX_DESC_CMD_IDE : 0);
 742 }
 743
 744 /**
 745  * ixgb_setup_rx_resources - allocate Rx resources (Descriptors)
 746  * @adapter: board private structure
 747  *
 748  * Returns 0 on success, negative on failure
 749  **/
 750
 751 int
 752 ixgb_setup_rx_resources(struct ixgb_adapter *adapter)
 753 {
 754         struct ixgb_desc_ring *rxdr = &adapter->rx_ring;
 755         struct pci_dev *pdev = adapter->pdev;
 756         int size;
 757
 758         size = sizeof(struct ixgb_buffer) * rxdr->count;
 759         rxdr->buffer_info = vmalloc(size);
 760         if (!rxdr->buffer_info) {
 761                 netif_err(adapter, probe, adapter->netdev,
 762                           "Unable to allocate receive descriptor ring\n");
 763                 return -ENOMEM;
 764         }
 765         memset(rxdr->buffer_info, 0, size);
 766
 767         /* Round up to nearest 4K */
 768
 769         rxdr->size = rxdr->count * sizeof(struct ixgb_rx_desc);
 770         rxdr->size = ALIGN(rxdr->size, 4096);
 771
 772         rxdr->desc = dma_alloc_coherent(&pdev->dev, rxdr->size, &rxdr->dma,
 773                                         GFP_KERNEL);
 774
 775         if (!rxdr->desc) {
 776                 vfree(rxdr->buffer_info);
 777                 netif_err(adapter, probe, adapter->netdev,
 778                           "Unable to allocate receive descriptors\n");
 779                 return -ENOMEM;
 780         }
 781         memset(rxdr->desc, 0, rxdr->size);
 782
 783         rxdr->next_to_clean = 0;
 784         rxdr->next_to_use = 0;
 785
 786         return 0;
 787 }
 788
 789 /**
 790  * ixgb_setup_rctl - configure the receive control register
 791  * @adapter: Board private structure
 792  **/
 793
 794 static void
 795 ixgb_setup_rctl(struct ixgb_adapter *adapter)
 796 {
 797         u32 rctl;
 798
 799         rctl = IXGB_READ_REG(&adapter->hw, RCTL);
 800
 801         rctl &= ~(3 << IXGB_RCTL_MO_SHIFT);
 802
 803         rctl |=
 804                 IXGB_RCTL_BAM | IXGB_RCTL_RDMTS_1_2 |
 805                 IXGB_RCTL_RXEN | IXGB_RCTL_CFF |
 806                 (adapter->hw.mc_filter_type << IXGB_RCTL_MO_SHIFT);
 807
 808         rctl |= IXGB_RCTL_SECRC;
 809
 810         if (adapter->rx_buffer_len <= IXGB_RXBUFFER_2048)
 811                 rctl |= IXGB_RCTL_BSIZE_2048;
 812         else if (adapter->rx_buffer_len <= IXGB_RXBUFFER_4096)
 813                 rctl |= IXGB_RCTL_BSIZE_4096;
 814         else if (adapter->rx_buffer_len <= IXGB_RXBUFFER_8192)
 815                 rctl |= IXGB_RCTL_BSIZE_8192;
 816         else if (adapter->rx_buffer_len <= IXGB_RXBUFFER_16384)
 817                 rctl |= IXGB_RCTL_BSIZE_16384;
 818
 819         IXGB_WRITE_REG(&adapter->hw, RCTL, rctl);
 820 }
 821
 822 /**
 823  * ixgb_configure_rx - Configure 82597 Receive Unit after Reset.
 824  * @adapter: board private structure
 825  *
 826  * Configure the Rx unit of the MAC after a reset.
 827  **/
 828
 829 static void
 830 ixgb_configure_rx(struct ixgb_adapter *adapter)
 831 {
 832         u64 rdba = adapter->rx_ring.dma;
 833         u32 rdlen = adapter->rx_ring.count * sizeof(struct ixgb_rx_desc);
 834         struct ixgb_hw *hw = &adapter->hw;
 835         u32 rctl;
 836         u32 rxcsum;
 837
 838         /* make sure receives are disabled while setting up the descriptors */
 839
 840         rctl = IXGB_READ_REG(hw, RCTL);
 841         IXGB_WRITE_REG(hw, RCTL, rctl & ~IXGB_RCTL_RXEN);
 842
 843         /* set the Receive Delay Timer Register */
 844
 845         IXGB_WRITE_REG(hw, RDTR, adapter->rx_int_delay);
 846
 847         /* Setup the Base and Length of the Rx Descriptor Ring */
 848
 849         IXGB_WRITE_REG(hw, RDBAL, (rdba & 0x00000000ffffffffULL));
 850         IXGB_WRITE_REG(hw, RDBAH, (rdba >> 32));
 851
 852         IXGB_WRITE_REG(hw, RDLEN, rdlen);
 853
 854         /* Setup the HW Rx Head and Tail Descriptor Pointers */
 855         IXGB_WRITE_REG(hw, RDH, 0);
 856         IXGB_WRITE_REG(hw, RDT, 0);
 857
 858         /* due to the hardware errata with RXDCTL, we are unable to use any of
 859          * the performance enhancing features of it without causing other
 860          * subtle bugs, some of the bugs could include receive length
 861          * corruption at high data rates (WTHRESH > 0) and/or receive
 862          * descriptor ring irregularites (particularly in hardware cache) */
 863         IXGB_WRITE_REG(hw, RXDCTL, 0);
 864
 865         /* Enable Receive Checksum Offload for TCP and UDP */
 866         if (adapter->rx_csum) {
 867                 rxcsum = IXGB_READ_REG(hw, RXCSUM);
 868                 rxcsum |= IXGB_RXCSUM_TUOFL;
 869                 IXGB_WRITE_REG(hw, RXCSUM, rxcsum);
 870         }
 871
 872         /* Enable Receives */
 873
 874         IXGB_WRITE_REG(hw, RCTL, rctl);
 875 }
 876
 877 /**
 878  * ixgb_free_tx_resources - Free Tx Resources
 879  * @adapter: board private structure
 880  *
 881  * Free all transmit software resources
 882  **/
 883
 884 void
 885 ixgb_free_tx_resources(struct ixgb_adapter *adapter)
 886 {
 887         struct pci_dev *pdev = adapter->pdev;
 888
 889         ixgb_clean_tx_ring(adapter);
 890
 891         vfree(adapter->tx_ring.buffer_info);
 892         adapter->tx_ring.buffer_info = NULL;
 893
 894         dma_free_coherent(&pdev->dev, adapter->tx_ring.size,
 895                           adapter->tx_ring.desc, adapter->tx_ring.dma);
 896
 897         adapter->tx_ring.desc = NULL;
 898 }
 899
 900 static void
 901 ixgb_unmap_and_free_tx_resource(struct ixgb_adapter *adapter,
 902                                 struct ixgb_buffer *buffer_info)
 903 {
 904         if (buffer_info->dma) {
 905                 if (buffer_info->mapped_as_page)
 906                         dma_unmap_page(&adapter->pdev->dev, buffer_info->dma,
 907                                        buffer_info->length, DMA_TO_DEVICE);
 908                 else
 909                         dma_unmap_single(&adapter->pdev->dev, buffer_info->dma,
 910                                          buffer_info->length, DMA_TO_DEVICE);
 911                 buffer_info->dma = 0;
 912         }
 913
 914         if (buffer_info->skb) {
 915                 dev_kfree_skb_any(buffer_info->skb);
 916                 buffer_info->skb = NULL;
 917         }
 918         buffer_info->time_stamp = 0;
 919         /* these fields must always be initialized in tx
 920          * buffer_info->length = 0;
 921          * buffer_info->next_to_watch = 0; */
 922 }
 923
 924 /**
 925  * ixgb_clean_tx_ring - Free Tx Buffers
 926  * @adapter: board private structure
 927  **/
 928
 929 static void
 930 ixgb_clean_tx_ring(struct ixgb_adapter *adapter)
 931 {
 932         struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
 933         struct ixgb_buffer *buffer_info;
 934         unsigned long size;
 935         unsigned int i;
 936
 937         /* Free all the Tx ring sk_buffs */
 938
 939         for (i = 0; i < tx_ring->count; i++) {
 940                 buffer_info = &tx_ring->buffer_info[i];
 941                 ixgb_unmap_and_free_tx_resource(adapter, buffer_info);
 942         }
 943
 944         size = sizeof(struct ixgb_buffer) * tx_ring->count;
 945         memset(tx_ring->buffer_info, 0, size);
 946
 947         /* Zero out the descriptor ring */
 948
 949         memset(tx_ring->desc, 0, tx_ring->size);
 950
 951         tx_ring->next_to_use = 0;
 952         tx_ring->next_to_clean = 0;
 953
 954         IXGB_WRITE_REG(&adapter->hw, TDH, 0);
 955         IXGB_WRITE_REG(&adapter->hw, TDT, 0);
 956 }
 957
 958 /**
 959  * ixgb_free_rx_resources - Free Rx Resources
 960  * @adapter: board private structure
 961  *
 962  * Free all receive software resources
 963  **/
 964
 965 void
 966 ixgb_free_rx_resources(struct ixgb_adapter *adapter)
 967 {
 968         struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
 969         struct pci_dev *pdev = adapter->pdev;
 970
 971         ixgb_clean_rx_ring(adapter);
 972
 973         vfree(rx_ring->buffer_info);
 974         rx_ring->buffer_info = NULL;
 975
 976         dma_free_coherent(&pdev->dev, rx_ring->size, rx_ring->desc,
 977                           rx_ring->dma);
 978
 979         rx_ring->desc = NULL;
 980 }
 981
 982 /**
 983  * ixgb_clean_rx_ring - Free Rx Buffers
 984  * @adapter: board private structure
 985  **/
 986
 987 static void
 988 ixgb_clean_rx_ring(struct ixgb_adapter *adapter)
 989 {
 990         struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
 991         struct ixgb_buffer *buffer_info;
 992         struct pci_dev *pdev = adapter->pdev;
 993         unsigned long size;
 994         unsigned int i;
 995
 996         /* Free all the Rx ring sk_buffs */
 997
 998         for (i = 0; i < rx_ring->count; i++) {
 999                 buffer_info = &rx_ring->buffer_info[i];
1000                 if (buffer_info->dma) {
1001                         dma_unmap_single(&pdev->dev,
1002                                          buffer_info->dma,
1003                                          buffer_info->length,
1004                                          DMA_FROM_DEVICE);
1005                         buffer_info->dma = 0;
1006                         buffer_info->length = 0;
1007                 }
1008
1009                 if (buffer_info->skb) {
1010                         dev_kfree_skb(buffer_info->skb);
1011                         buffer_info->skb = NULL;
1012                 }
1013         }
1014
1015         size = sizeof(struct ixgb_buffer) * rx_ring->count;
1016         memset(rx_ring->buffer_info, 0, size);
1017
1018         /* Zero out the descriptor ring */
1019
1020         memset(rx_ring->desc, 0, rx_ring->size);
1021
1022         rx_ring->next_to_clean = 0;
1023         rx_ring->next_to_use = 0;
1024
1025         IXGB_WRITE_REG(&adapter->hw, RDH, 0);
1026         IXGB_WRITE_REG(&adapter->hw, RDT, 0);
1027 }
1028
1029 /**
1030  * ixgb_set_mac - Change the Ethernet Address of the NIC
1031  * @netdev: network interface device structure
1032  * @p: pointer to an address structure
1033  *
1034  * Returns 0 on success, negative on failure
1035  **/
1036
1037 static int
1038 ixgb_set_mac(struct net_device *netdev, void *p)
1039 {
1040         struct ixgb_adapter *adapter = netdev_priv(netdev);
1041         struct sockaddr *addr = p;
1042
1043         if (!is_valid_ether_addr(addr->sa_data))
1044                 return -EADDRNOTAVAIL;
1045
1046         memcpy(netdev->dev_addr, addr->sa_data, netdev->addr_len);
1047
1048         ixgb_rar_set(&adapter->hw, addr->sa_data, 0);
1049
1050         return 0;
1051 }
1052
1053 /**
1054  * ixgb_set_multi - Multicast and Promiscuous mode set
1055  * @netdev: network interface device structure
1056  *
1057  * The set_multi entry point is called whenever the multicast address
1058  * list or the network interface flags are updated.  This routine is
1059  * responsible for configuring the hardware for proper multicast,
1060  * promiscuous mode, and all-multi behavior.
1061  **/
1062
1063 static void
1064 ixgb_set_multi(struct net_device *netdev)
1065 {
1066         struct ixgb_adapter *adapter = netdev_priv(netdev);
1067         struct ixgb_hw *hw = &adapter->hw;
1068         struct netdev_hw_addr *ha;
1069         u32 rctl;
1070         int i;
1071
1072         /* Check for Promiscuous and All Multicast modes */
1073
1074         rctl = IXGB_READ_REG(hw, RCTL);
1075
1076         if (netdev->flags & IFF_PROMISC) {
1077                 rctl |= (IXGB_RCTL_UPE | IXGB_RCTL_MPE);
1078                 rctl &= ~IXGB_RCTL_VFE;
1079         } else {
1080                 if (netdev->flags & IFF_ALLMULTI) {
1081                         rctl |= IXGB_RCTL_MPE;
1082                         rctl &= ~IXGB_RCTL_UPE;
1083                 } else {
1084                         rctl &= ~(IXGB_RCTL_UPE | IXGB_RCTL_MPE);
1085                 }
1086                 rctl |= IXGB_RCTL_VFE;
1087         }
1088
1089         if (netdev_mc_count(netdev) > IXGB_MAX_NUM_MULTICAST_ADDRESSES) {
1090                 rctl |= IXGB_RCTL_MPE;
1091                 IXGB_WRITE_REG(hw, RCTL, rctl);
1092         } else {
1093                 u8 mta[IXGB_MAX_NUM_MULTICAST_ADDRESSES *
1094                             IXGB_ETH_LENGTH_OF_ADDRESS];
1095
1096                 IXGB_WRITE_REG(hw, RCTL, rctl);
1097
1098                 i = 0;
1099                 netdev_for_each_mc_addr(ha, netdev)
1100                         memcpy(&mta[i++ * IXGB_ETH_LENGTH_OF_ADDRESS],
1101                                ha->addr, IXGB_ETH_LENGTH_OF_ADDRESS);
1102
1103                 ixgb_mc_addr_list_update(hw, mta, netdev_mc_count(netdev), 0);
1104         }
1105 }
1106
1107 /**
1108  * ixgb_watchdog - Timer Call-back
1109  * @data: pointer to netdev cast into an unsigned long
1110  **/
1111
1112 static void
1113 ixgb_watchdog(unsigned long data)
1114 {
1115         struct ixgb_adapter *adapter = (struct ixgb_adapter *)data;
1116         struct net_device *netdev = adapter->netdev;
1117         struct ixgb_desc_ring *txdr = &adapter->tx_ring;
1118
1119         ixgb_check_for_link(&adapter->hw);
1120
1121         if (ixgb_check_for_bad_link(&adapter->hw)) {
1122                 /* force the reset path */
1123                 netif_stop_queue(netdev);
1124         }
1125
1126         if (adapter->hw.link_up) {
1127                 if (!netif_carrier_ok(netdev)) {
1128                         netdev_info(netdev,
1129                                     "NIC Link is Up 10 Gbps Full Duplex, Flow Control: %s\n",
1130                                     (adapter->hw.fc.type == ixgb_fc_full) ?
1131                                     "RX/TX" :
1132                                     (adapter->hw.fc.type == ixgb_fc_rx_pause) ?
1133                                      "RX" :
1134                                     (adapter->hw.fc.type == ixgb_fc_tx_pause) ?
1135                                     "TX" : "None");
1136                         adapter->link_speed = 10000;
1137                         adapter->link_duplex = FULL_DUPLEX;
1138                         netif_carrier_on(netdev);
1139                 }
1140         } else {
1141                 if (netif_carrier_ok(netdev)) {
1142                         adapter->link_speed = 0;
1143                         adapter->link_duplex = 0;
1144                         netdev_info(netdev, "NIC Link is Down\n");
1145                         netif_carrier_off(netdev);
1146                 }
1147         }
1148
1149         ixgb_update_stats(adapter);
1150
1151         if (!netif_carrier_ok(netdev)) {
1152                 if (IXGB_DESC_UNUSED(txdr) + 1 < txdr->count) {
1153                         /* We've lost link, so the controller stops DMA,
1154                          * but we've got queued Tx work that's never going
1155                          * to get done, so reset controller to flush Tx.
1156                          * (Do the reset outside of interrupt context). */
1157                         schedule_work(&adapter->tx_timeout_task);
1158                         /* return immediately since reset is imminent */
1159                         return;
1160                 }
1161         }
1162
1163         /* Force detection of hung controller every watchdog period */
1164         adapter->detect_tx_hung = true;
1165
1166         /* generate an interrupt to force clean up of any stragglers */
1167         IXGB_WRITE_REG(&adapter->hw, ICS, IXGB_INT_TXDW);
1168
1169         /* Reset the timer */
1170         mod_timer(&adapter->watchdog_timer, jiffies + 2 * HZ);
1171 }
1172
1173 #define IXGB_TX_FLAGS_CSUM              0x00000001
1174 #define IXGB_TX_FLAGS_VLAN              0x00000002
1175 #define IXGB_TX_FLAGS_TSO               0x00000004
1176
1177 static int
1178 ixgb_tso(struct ixgb_adapter *adapter, struct sk_buff *skb)
1179 {
1180         struct ixgb_context_desc *context_desc;
1181         unsigned int i;
1182         u8 ipcss, ipcso, tucss, tucso, hdr_len;
1183         u16 ipcse, tucse, mss;
1184         int err;
1185
1186         if (likely(skb_is_gso(skb))) {
1187                 struct ixgb_buffer *buffer_info;
1188                 struct iphdr *iph;
1189
1190                 if (skb_header_cloned(skb)) {
1191                         err = pskb_expand_head(skb, 0, 0, GFP_ATOMIC);
1192                         if (err)
1193                                 return err;
1194                 }
1195
1196                 hdr_len = skb_transport_offset(skb) + tcp_hdrlen(skb);
1197                 mss = skb_shinfo(skb)->gso_size;
1198                 iph = ip_hdr(skb);
1199                 iph->tot_len = 0;
1200                 iph->check = 0;
1201                 tcp_hdr(skb)->check = ~csum_tcpudp_magic(iph->saddr,
1202                                                          iph->daddr, 0,
1203                                                          IPPROTO_TCP, 0);
1204                 ipcss = skb_network_offset(skb);
1205                 ipcso = (void *)&(iph->check) - (void *)skb->data;
1206                 ipcse = skb_transport_offset(skb) - 1;
1207                 tucss = skb_transport_offset(skb);
1208                 tucso = (void *)&(tcp_hdr(skb)->check) - (void *)skb->data;
1209                 tucse = 0;
1210
1211                 i = adapter->tx_ring.next_to_use;
1212                 context_desc = IXGB_CONTEXT_DESC(adapter->tx_ring, i);
1213                 buffer_info = &adapter->tx_ring.buffer_info[i];
1214                 WARN_ON(buffer_info->dma != 0);
1215
1216                 context_desc->ipcss = ipcss;
1217                 context_desc->ipcso = ipcso;
1218                 context_desc->ipcse = cpu_to_le16(ipcse);
1219                 context_desc->tucss = tucss;
1220                 context_desc->tucso = tucso;
1221                 context_desc->tucse = cpu_to_le16(tucse);
1222                 context_desc->mss = cpu_to_le16(mss);
1223                 context_desc->hdr_len = hdr_len;
1224                 context_desc->status = 0;
1225                 context_desc->cmd_type_len = cpu_to_le32(
1226                                                   IXGB_CONTEXT_DESC_TYPE
1227                                                 | IXGB_CONTEXT_DESC_CMD_TSE
1228                                                 | IXGB_CONTEXT_DESC_CMD_IP
1229                                                 | IXGB_CONTEXT_DESC_CMD_TCP
1230                                                 | IXGB_CONTEXT_DESC_CMD_IDE
1231                                                 | (skb->len - (hdr_len)));
1232
1233
1234                 if (++i == adapter->tx_ring.count) i = 0;
1235                 adapter->tx_ring.next_to_use = i;
1236
1237                 return 1;
1238         }
1239
1240         return 0;
1241 }
1242
1243 static bool
1244 ixgb_tx_csum(struct ixgb_adapter *adapter, struct sk_buff *skb)
1245 {
1246         struct ixgb_context_desc *context_desc;
1247         unsigned int i;
1248         u8 css, cso;
1249
1250         if (likely(skb->ip_summed == CHECKSUM_PARTIAL)) {
1251                 struct ixgb_buffer *buffer_info;
1252                 css = skb_transport_offset(skb);
1253                 cso = css + skb->csum_offset;
1254
1255                 i = adapter->tx_ring.next_to_use;
1256                 context_desc = IXGB_CONTEXT_DESC(adapter->tx_ring, i);
1257                 buffer_info = &adapter->tx_ring.buffer_info[i];
1258                 WARN_ON(buffer_info->dma != 0);
1259
1260                 context_desc->tucss = css;
1261                 context_desc->tucso = cso;
1262                 context_desc->tucse = 0;
1263                 /* zero out any previously existing data in one instruction */
1264                 *(u32 *)&(context_desc->ipcss) = 0;
1265                 context_desc->status = 0;
1266                 context_desc->hdr_len = 0;
1267                 context_desc->mss = 0;
1268                 context_desc->cmd_type_len =
1269                         cpu_to_le32(IXGB_CONTEXT_DESC_TYPE
1270                                     | IXGB_TX_DESC_CMD_IDE);
1271
1272                 if (++i == adapter->tx_ring.count) i = 0;
1273                 adapter->tx_ring.next_to_use = i;
1274
1275                 return true;
1276         }
1277
1278         return false;
1279 }
1280
1281 #define IXGB_MAX_TXD_PWR        14
1282 #define IXGB_MAX_DATA_PER_TXD   (1<<IXGB_MAX_TXD_PWR)
1283
1284 static int
1285 ixgb_tx_map(struct ixgb_adapter *adapter, struct sk_buff *skb,
1286             unsigned int first)
1287 {
1288         struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
1289         struct pci_dev *pdev = adapter->pdev;
1290         struct ixgb_buffer *buffer_info;
1291         int len = skb_headlen(skb);
1292         unsigned int offset = 0, size, count = 0, i;
1293         unsigned int mss = skb_shinfo(skb)->gso_size;
1294         unsigned int nr_frags = skb_shinfo(skb)->nr_frags;
1295         unsigned int f;
1296
1297         i = tx_ring->next_to_use;
1298
1299         while (len) {
1300                 buffer_info = &tx_ring->buffer_info[i];
1301                 size = min(len, IXGB_MAX_DATA_PER_TXD);
1302                 /* Workaround for premature desc write-backs
1303                  * in TSO mode.  Append 4-byte sentinel desc */
1304                 if (unlikely(mss && !nr_frags && size == len && size > 8))
1305                         size -= 4;
1306
1307                 buffer_info->length = size;
1308                 WARN_ON(buffer_info->dma != 0);
1309                 buffer_info->time_stamp = jiffies;
1310                 buffer_info->mapped_as_page = false;
1311                 buffer_info->dma = dma_map_single(&pdev->dev,
1312                                                   skb->data + offset,
1313                                                   size, DMA_TO_DEVICE);
1314                 if (dma_mapping_error(&pdev->dev, buffer_info->dma))
1315                         goto dma_error;
1316                 buffer_info->next_to_watch = 0;
1317
1318                 len -= size;
1319                 offset += size;
1320                 count++;
1321                 if (len) {
1322                         i++;
1323                         if (i == tx_ring->count)
1324                                 i = 0;
1325                 }
1326         }
1327
1328         for (f = 0; f < nr_frags; f++) {
1329                 struct skb_frag_struct *frag;
1330
1331                 frag = &skb_shinfo(skb)->frags[f];
1332                 len = frag->size;
1333                 offset = frag->page_offset;
1334
1335                 while (len) {
1336                         i++;
1337                         if (i == tx_ring->count)
1338                                 i = 0;
1339
1340                         buffer_info = &tx_ring->buffer_info[i];
1341                         size = min(len, IXGB_MAX_DATA_PER_TXD);
1342
1343                         /* Workaround for premature desc write-backs
1344                          * in TSO mode.  Append 4-byte sentinel desc */
1345                         if (unlikely(mss && (f == (nr_frags - 1))
1346                                      && size == len && size > 8))
1347                                 size -= 4;
1348
1349                         buffer_info->length = size;
1350                         buffer_info->time_stamp = jiffies;
1351                         buffer_info->mapped_as_page = true;
1352                         buffer_info->dma =
1353                                 dma_map_page(&pdev->dev, frag->page,
1354                                              offset, size, DMA_TO_DEVICE);
1355                         if (dma_mapping_error(&pdev->dev, buffer_info->dma))
1356                                 goto dma_error;
1357                         buffer_info->next_to_watch = 0;
1358
1359                         len -= size;
1360                         offset += size;
1361                         count++;
1362                 }
1363         }
1364         tx_ring->buffer_info[i].skb = skb;
1365         tx_ring->buffer_info[first].next_to_watch = i;
1366
1367         return count;
1368
1369 dma_error:
1370         dev_err(&pdev->dev, "TX DMA map failed\n");
1371         buffer_info->dma = 0;
1372         if (count)
1373                 count--;
1374
1375         while (count--) {
1376                 if (i==0)
1377                         i += tx_ring->count;
1378                 i--;
1379                 buffer_info = &tx_ring->buffer_info[i];
1380                 ixgb_unmap_and_free_tx_resource(adapter, buffer_info);
1381         }
1382
1383         return 0;
1384 }
1385
1386 static void
1387 ixgb_tx_queue(struct ixgb_adapter *adapter, int count, int vlan_id,int tx_flags)
1388 {
1389         struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
1390         struct ixgb_tx_desc *tx_desc = NULL;
1391         struct ixgb_buffer *buffer_info;
1392         u32 cmd_type_len = adapter->tx_cmd_type;
1393         u8 status = 0;
1394         u8 popts = 0;
1395         unsigned int i;
1396
1397         if (tx_flags & IXGB_TX_FLAGS_TSO) {
1398                 cmd_type_len |= IXGB_TX_DESC_CMD_TSE;
1399                 popts |= (IXGB_TX_DESC_POPTS_IXSM | IXGB_TX_DESC_POPTS_TXSM);
1400         }
1401
1402         if (tx_flags & IXGB_TX_FLAGS_CSUM)
1403                 popts |= IXGB_TX_DESC_POPTS_TXSM;
1404
1405         if (tx_flags & IXGB_TX_FLAGS_VLAN)
1406                 cmd_type_len |= IXGB_TX_DESC_CMD_VLE;
1407
1408         i = tx_ring->next_to_use;
1409
1410         while (count--) {
1411                 buffer_info = &tx_ring->buffer_info[i];
1412                 tx_desc = IXGB_TX_DESC(*tx_ring, i);
1413                 tx_desc->buff_addr = cpu_to_le64(buffer_info->dma);
1414                 tx_desc->cmd_type_len =
1415                         cpu_to_le32(cmd_type_len | buffer_info->length);
1416                 tx_desc->status = status;
1417                 tx_desc->popts = popts;
1418                 tx_desc->vlan = cpu_to_le16(vlan_id);
1419
1420                 if (++i == tx_ring->count) i = 0;
1421         }
1422
1423         tx_desc->cmd_type_len |=
1424                 cpu_to_le32(IXGB_TX_DESC_CMD_EOP | IXGB_TX_DESC_CMD_RS);
1425
1426         /* Force memory writes to complete before letting h/w
1427          * know there are new descriptors to fetch.  (Only
1428          * applicable for weak-ordered memory model archs,
1429          * such as IA-64). */
1430         wmb();
1431
1432         tx_ring->next_to_use = i;
1433         IXGB_WRITE_REG(&adapter->hw, TDT, i);
1434 }
1435
1436 static int __ixgb_maybe_stop_tx(struct net_device *netdev, int size)
1437 {
1438         struct ixgb_adapter *adapter = netdev_priv(netdev);
1439         struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
1440
1441         netif_stop_queue(netdev);
1442         /* Herbert's original patch had:
1443          *  smp_mb__after_netif_stop_queue();
1444          * but since that doesn't exist yet, just open code it. */
1445         smp_mb();
1446
1447         /* We need to check again in a case another CPU has just
1448          * made room available. */
1449         if (likely(IXGB_DESC_UNUSED(tx_ring) < size))
1450                 return -EBUSY;
1451
1452         /* A reprieve! */
1453         netif_start_queue(netdev);
1454         ++adapter->restart_queue;
1455         return 0;
1456 }
1457
1458 static int ixgb_maybe_stop_tx(struct net_device *netdev,
1459                               struct ixgb_desc_ring *tx_ring, int size)
1460 {
1461         if (likely(IXGB_DESC_UNUSED(tx_ring) >= size))
1462                 return 0;
1463         return __ixgb_maybe_stop_tx(netdev, size);
1464 }
1465
1466
1467 /* Tx Descriptors needed, worst case */
1468 #define TXD_USE_COUNT(S) (((S) >> IXGB_MAX_TXD_PWR) + \
1469                          (((S) & (IXGB_MAX_DATA_PER_TXD - 1)) ? 1 : 0))
1470 #define DESC_NEEDED TXD_USE_COUNT(IXGB_MAX_DATA_PER_TXD) /* skb->date */ + \
1471         MAX_SKB_FRAGS * TXD_USE_COUNT(PAGE_SIZE) + 1 /* for context */ \
1472         + 1 /* one more needed for sentinel TSO workaround */
1473
1474 static netdev_tx_t
1475 ixgb_xmit_frame(struct sk_buff *skb, struct net_device *netdev)
1476 {
1477         struct ixgb_adapter *adapter = netdev_priv(netdev);
1478         unsigned int first;
1479         unsigned int tx_flags = 0;
1480         int vlan_id = 0;
1481         int count = 0;
1482         int tso;
1483
1484         if (test_bit(__IXGB_DOWN, &adapter->flags)) {
1485                 dev_kfree_skb(skb);
1486                 return NETDEV_TX_OK;
1487         }
1488
1489         if (skb->len <= 0) {
1490                 dev_kfree_skb(skb);
1491                 return NETDEV_TX_OK;
1492         }
1493
1494         if (unlikely(ixgb_maybe_stop_tx(netdev, &adapter->tx_ring,
1495                      DESC_NEEDED)))
1496                 return NETDEV_TX_BUSY;
1497
1498         if (adapter->vlgrp && vlan_tx_tag_present(skb)) {
1499                 tx_flags |= IXGB_TX_FLAGS_VLAN;
1500                 vlan_id = vlan_tx_tag_get(skb);
1501         }
1502
1503         first = adapter->tx_ring.next_to_use;
1504
1505         tso = ixgb_tso(adapter, skb);
1506         if (tso < 0) {
1507                 dev_kfree_skb(skb);
1508                 return NETDEV_TX_OK;
1509         }
1510
1511         if (likely(tso))
1512                 tx_flags |= IXGB_TX_FLAGS_TSO;
1513         else if (ixgb_tx_csum(adapter, skb))
1514                 tx_flags |= IXGB_TX_FLAGS_CSUM;
1515
1516         count = ixgb_tx_map(adapter, skb, first);
1517
1518         if (count) {
1519                 ixgb_tx_queue(adapter, count, vlan_id, tx_flags);
1520                 /* Make sure there is space in the ring for the next send. */
1521                 ixgb_maybe_stop_tx(netdev, &adapter->tx_ring, DESC_NEEDED);
1522
1523         } else {
1524                 dev_kfree_skb_any(skb);
1525                 adapter->tx_ring.buffer_info[first].time_stamp = 0;
1526                 adapter->tx_ring.next_to_use = first;
1527         }
1528
1529         return NETDEV_TX_OK;
1530 }
1531
1532 /**
1533  * ixgb_tx_timeout - Respond to a Tx Hang
1534  * @netdev: network interface device structure
1535  **/
1536
1537 static void
1538 ixgb_tx_timeout(struct net_device *netdev)
1539 {
1540         struct ixgb_adapter *adapter = netdev_priv(netdev);
1541
1542         /* Do the reset outside of interrupt context */
1543         schedule_work(&adapter->tx_timeout_task);
1544 }
1545
1546 static void
1547 ixgb_tx_timeout_task(struct work_struct *work)
1548 {
1549         struct ixgb_adapter *adapter =
1550                 container_of(work, struct ixgb_adapter, tx_timeout_task);
1551
1552         adapter->tx_timeout_count++;
1553         ixgb_down(adapter, true);
1554         ixgb_up(adapter);
1555 }
1556
1557 /**
1558  * ixgb_get_stats - Get System Network Statistics
1559  * @netdev: network interface device structure
1560  *
1561  * Returns the address of the device statistics structure.
1562  * The statistics are actually updated from the timer callback.
1563  **/
1564
1565 static struct net_device_stats *
1566 ixgb_get_stats(struct net_device *netdev)
1567 {
1568         return &netdev->stats;
1569 }
1570
1571 /**
1572  * ixgb_change_mtu - Change the Maximum Transfer Unit
1573  * @netdev: network interface device structure
1574  * @new_mtu: new value for maximum frame size
1575  *
1576  * Returns 0 on success, negative on failure
1577  **/
1578
1579 static int
1580 ixgb_change_mtu(struct net_device *netdev, int new_mtu)
1581 {
1582         struct ixgb_adapter *adapter = netdev_priv(netdev);
1583         int max_frame = new_mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;
1584         int old_max_frame = netdev->mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;
1585
1586         /* MTU < 68 is an error for IPv4 traffic, just don't allow it */
1587         if ((new_mtu < 68) ||
1588             (max_frame > IXGB_MAX_JUMBO_FRAME_SIZE + ENET_FCS_LENGTH)) {
1589                 netif_err(adapter, probe, adapter->netdev,
1590                           "Invalid MTU setting %d\n", new_mtu);
1591                 return -EINVAL;
1592         }
1593
1594         if (old_max_frame == max_frame)
1595                 return 0;
1596
1597         if (netif_running(netdev))
1598                 ixgb_down(adapter, true);
1599
1600         adapter->rx_buffer_len = max_frame + 8; /* + 8 for errata */
1601
1602         netdev->mtu = new_mtu;
1603
1604         if (netif_running(netdev))
1605                 ixgb_up(adapter);
1606
1607         return 0;
1608 }
1609
1610 /**
1611  * ixgb_update_stats - Update the board statistics counters.
1612  * @adapter: board private structure
1613  **/
1614
1615 void
1616 ixgb_update_stats(struct ixgb_adapter *adapter)
1617 {
1618         struct net_device *netdev = adapter->netdev;
1619         struct pci_dev *pdev = adapter->pdev;
1620
1621         /* Prevent stats update while adapter is being reset */
1622         if (pci_channel_offline(pdev))
1623                 return;
1624
1625         if ((netdev->flags & IFF_PROMISC) || (netdev->flags & IFF_ALLMULTI) ||
1626            (netdev_mc_count(netdev) > IXGB_MAX_NUM_MULTICAST_ADDRESSES)) {
1627                 u64 multi = IXGB_READ_REG(&adapter->hw, MPRCL);
1628                 u32 bcast_l = IXGB_READ_REG(&adapter->hw, BPRCL);
1629                 u32 bcast_h = IXGB_READ_REG(&adapter->hw, BPRCH);
1630                 u64 bcast = ((u64)bcast_h << 32) | bcast_l;
1631
1632                 multi |= ((u64)IXGB_READ_REG(&adapter->hw, MPRCH) << 32);
1633                 /* fix up multicast stats by removing broadcasts */
1634                 if (multi >= bcast)
1635                         multi -= bcast;
1636
1637                 adapter->stats.mprcl += (multi & 0xFFFFFFFF);
1638                 adapter->stats.mprch += (multi >> 32);
1639                 adapter->stats.bprcl += bcast_l;
1640                 adapter->stats.bprch += bcast_h;
1641         } else {
1642                 adapter->stats.mprcl += IXGB_READ_REG(&adapter->hw, MPRCL);
1643                 adapter->stats.mprch += IXGB_READ_REG(&adapter->hw, MPRCH);
1644                 adapter->stats.bprcl += IXGB_READ_REG(&adapter->hw, BPRCL);
1645                 adapter->stats.bprch += IXGB_READ_REG(&adapter->hw, BPRCH);
1646         }
1647         adapter->stats.tprl += IXGB_READ_REG(&adapter->hw, TPRL);
1648         adapter->stats.tprh += IXGB_READ_REG(&adapter->hw, TPRH);
1649         adapter->stats.gprcl += IXGB_READ_REG(&adapter->hw, GPRCL);
1650         adapter->stats.gprch += IXGB_READ_REG(&adapter->hw, GPRCH);
1651         adapter->stats.uprcl += IXGB_READ_REG(&adapter->hw, UPRCL);
1652         adapter->stats.uprch += IXGB_READ_REG(&adapter->hw, UPRCH);
1653         adapter->stats.vprcl += IXGB_READ_REG(&adapter->hw, VPRCL);
1654         adapter->stats.vprch += IXGB_READ_REG(&adapter->hw, VPRCH);
1655         adapter->stats.jprcl += IXGB_READ_REG(&adapter->hw, JPRCL);
1656         adapter->stats.jprch += IXGB_READ_REG(&adapter->hw, JPRCH);
1657         adapter->stats.gorcl += IXGB_READ_REG(&adapter->hw, GORCL);
1658         adapter->stats.gorch += IXGB_READ_REG(&adapter->hw, GORCH);
1659         adapter->stats.torl += IXGB_READ_REG(&adapter->hw, TORL);
1660         adapter->stats.torh += IXGB_READ_REG(&adapter->hw, TORH);
1661         adapter->stats.rnbc += IXGB_READ_REG(&adapter->hw, RNBC);
1662         adapter->stats.ruc += IXGB_READ_REG(&adapter->hw, RUC);
1663         adapter->stats.roc += IXGB_READ_REG(&adapter->hw, ROC);
1664         adapter->stats.rlec += IXGB_READ_REG(&adapter->hw, RLEC);
1665         adapter->stats.crcerrs += IXGB_READ_REG(&adapter->hw, CRCERRS);
1666         adapter->stats.icbc += IXGB_READ_REG(&adapter->hw, ICBC);
1667         adapter->stats.ecbc += IXGB_READ_REG(&adapter->hw, ECBC);
1668         adapter->stats.mpc += IXGB_READ_REG(&adapter->hw, MPC);
1669         adapter->stats.tptl += IXGB_READ_REG(&adapter->hw, TPTL);
1670         adapter->stats.tpth += IXGB_READ_REG(&adapter->hw, TPTH);
1671         adapter->stats.gptcl += IXGB_READ_REG(&adapter->hw, GPTCL);
1672         adapter->stats.gptch += IXGB_READ_REG(&adapter->hw, GPTCH);
1673         adapter->stats.bptcl += IXGB_READ_REG(&adapter->hw, BPTCL);
1674         adapter->stats.bptch += IXGB_READ_REG(&adapter->hw, BPTCH);
1675         adapter->stats.mptcl += IXGB_READ_REG(&adapter->hw, MPTCL);
1676         adapter->stats.mptch += IXGB_READ_REG(&adapter->hw, MPTCH);
1677         adapter->stats.uptcl += IXGB_READ_REG(&adapter->hw, UPTCL);
1678         adapter->stats.uptch += IXGB_READ_REG(&adapter->hw, UPTCH);
1679         adapter->stats.vptcl += IXGB_READ_REG(&adapter->hw, VPTCL);
1680         adapter->stats.vptch += IXGB_READ_REG(&adapter->hw, VPTCH);
1681         adapter->stats.jptcl += IXGB_READ_REG(&adapter->hw, JPTCL);
1682         adapter->stats.jptch += IXGB_READ_REG(&adapter->hw, JPTCH);
1683         adapter->stats.gotcl += IXGB_READ_REG(&adapter->hw, GOTCL);
1684         adapter->stats.gotch += IXGB_READ_REG(&adapter->hw, GOTCH);
1685         adapter->stats.totl += IXGB_READ_REG(&adapter->hw, TOTL);
1686         adapter->stats.toth += IXGB_READ_REG(&adapter->hw, TOTH);
1687         adapter->stats.dc += IXGB_READ_REG(&adapter->hw, DC);
1688         adapter->stats.plt64c += IXGB_READ_REG(&adapter->hw, PLT64C);
1689         adapter->stats.tsctc += IXGB_READ_REG(&adapter->hw, TSCTC);
1690         adapter->stats.tsctfc += IXGB_READ_REG(&adapter->hw, TSCTFC);
1691         adapter->stats.ibic += IXGB_READ_REG(&adapter->hw, IBIC);
1692         adapter->stats.rfc += IXGB_READ_REG(&adapter->hw, RFC);
1693         adapter->stats.lfc += IXGB_READ_REG(&adapter->hw, LFC);
1694         adapter->stats.pfrc += IXGB_READ_REG(&adapter->hw, PFRC);
1695         adapter->stats.pftc += IXGB_READ_REG(&adapter->hw, PFTC);
1696         adapter->stats.mcfrc += IXGB_READ_REG(&adapter->hw, MCFRC);
1697         adapter->stats.mcftc += IXGB_READ_REG(&adapter->hw, MCFTC);
1698         adapter->stats.xonrxc += IXGB_READ_REG(&adapter->hw, XONRXC);
1699         adapter->stats.xontxc += IXGB_READ_REG(&adapter->hw, XONTXC);
1700         adapter->stats.xoffrxc += IXGB_READ_REG(&adapter->hw, XOFFRXC);
1701         adapter->stats.xofftxc += IXGB_READ_REG(&adapter->hw, XOFFTXC);
1702         adapter->stats.rjc += IXGB_READ_REG(&adapter->hw, RJC);
1703
1704         /* Fill out the OS statistics structure */
1705
1706         netdev->stats.rx_packets = adapter->stats.gprcl;
1707         netdev->stats.tx_packets = adapter->stats.gptcl;
1708         netdev->stats.rx_bytes = adapter->stats.gorcl;
1709         netdev->stats.tx_bytes = adapter->stats.gotcl;
1710         netdev->stats.multicast = adapter->stats.mprcl;
1711         netdev->stats.collisions = 0;
1712
1713         /* ignore RLEC as it reports errors for padded (<64bytes) frames
1714          * with a length in the type/len field */
1715         netdev->stats.rx_errors =
1716             /* adapter->stats.rnbc + */ adapter->stats.crcerrs +
1717             adapter->stats.ruc +
1718             adapter->stats.roc /*+ adapter->stats.rlec */  +
1719             adapter->stats.icbc +
1720             adapter->stats.ecbc + adapter->stats.mpc;
1721
1722         /* see above
1723          * netdev->stats.rx_length_errors = adapter->stats.rlec;
1724          */
1725
1726         netdev->stats.rx_crc_errors = adapter->stats.crcerrs;
1727         netdev->stats.rx_fifo_errors = adapter->stats.mpc;
1728         netdev->stats.rx_missed_errors = adapter->stats.mpc;
1729         netdev->stats.rx_over_errors = adapter->stats.mpc;
1730
1731         netdev->stats.tx_errors = 0;
1732         netdev->stats.rx_frame_errors = 0;
1733         netdev->stats.tx_aborted_errors = 0;
1734         netdev->stats.tx_carrier_errors = 0;
1735         netdev->stats.tx_fifo_errors = 0;
1736         netdev->stats.tx_heartbeat_errors = 0;
1737         netdev->stats.tx_window_errors = 0;
1738 }
1739
1740 #define IXGB_MAX_INTR 10
1741 /**
1742  * ixgb_intr - Interrupt Handler
1743  * @irq: interrupt number
1744  * @data: pointer to a network interface device structure
1745  **/
1746
1747 static irqreturn_t
1748 ixgb_intr(int irq, void *data)
1749 {
1750         struct net_device *netdev = data;
1751         struct ixgb_adapter *adapter = netdev_priv(netdev);
1752         struct ixgb_hw *hw = &adapter->hw;
1753         u32 icr = IXGB_READ_REG(hw, ICR);
1754
1755         if (unlikely(!icr))
1756                 return IRQ_NONE;  /* Not our interrupt */
1757
1758         if (unlikely(icr & (IXGB_INT_RXSEQ | IXGB_INT_LSC)))
1759                 if (!test_bit(__IXGB_DOWN, &adapter->flags))
1760                         mod_timer(&adapter->watchdog_timer, jiffies);
1761
1762         if (napi_schedule_prep(&adapter->napi)) {
1763
1764                 /* Disable interrupts and register for poll. The flush
1765                   of the posted write is intentionally left out.
1766                 */
1767
1768                 IXGB_WRITE_REG(&adapter->hw, IMC, ~0);
1769                 __napi_schedule(&adapter->napi);
1770         }
1771         return IRQ_HANDLED;
1772 }
1773
1774 /**
1775  * ixgb_clean - NAPI Rx polling callback
1776  * @adapter: board private structure
1777  **/
1778
1779 static int
1780 ixgb_clean(struct napi_struct *napi, int budget)
1781 {
1782         struct ixgb_adapter *adapter = container_of(napi, struct ixgb_adapter, napi);
1783         int work_done = 0;
1784
1785         ixgb_clean_tx_irq(adapter);
1786         ixgb_clean_rx_irq(adapter, &work_done, budget);
1787
1788         /* If budget not fully consumed, exit the polling mode */
1789         if (work_done < budget) {
1790                 napi_complete(napi);
1791                 if (!test_bit(__IXGB_DOWN, &adapter->flags))
1792                         ixgb_irq_enable(adapter);
1793         }
1794
1795         return work_done;
1796 }
1797
1798 /**
1799  * ixgb_clean_tx_irq - Reclaim resources after transmit completes
1800  * @adapter: board private structure
1801  **/
1802
1803 static bool
1804 ixgb_clean_tx_irq(struct ixgb_adapter *adapter)
1805 {
1806         struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
1807         struct net_device *netdev = adapter->netdev;
1808         struct ixgb_tx_desc *tx_desc, *eop_desc;
1809         struct ixgb_buffer *buffer_info;
1810         unsigned int i, eop;
1811         bool cleaned = false;
1812
1813         i = tx_ring->next_to_clean;
1814         eop = tx_ring->buffer_info[i].next_to_watch;
1815         eop_desc = IXGB_TX_DESC(*tx_ring, eop);
1816
1817         while (eop_desc->status & IXGB_TX_DESC_STATUS_DD) {
1818
1819                 for (cleaned = false; !cleaned; ) {
1820                         tx_desc = IXGB_TX_DESC(*tx_ring, i);
1821                         buffer_info = &tx_ring->buffer_info[i];
1822
1823                         if (tx_desc->popts &
1824                            (IXGB_TX_DESC_POPTS_TXSM |
1825                             IXGB_TX_DESC_POPTS_IXSM))
1826                                 adapter->hw_csum_tx_good++;
1827
1828                         ixgb_unmap_and_free_tx_resource(adapter, buffer_info);
1829
1830                         *(u32 *)&(tx_desc->status) = 0;
1831
1832                         cleaned = (i == eop);
1833                         if (++i == tx_ring->count) i = 0;
1834                 }
1835
1836                 eop = tx_ring->buffer_info[i].next_to_watch;
1837                 eop_desc = IXGB_TX_DESC(*tx_ring, eop);
1838         }
1839
1840         tx_ring->next_to_clean = i;
1841
1842         if (unlikely(cleaned && netif_carrier_ok(netdev) &&
1843                      IXGB_DESC_UNUSED(tx_ring) >= DESC_NEEDED)) {
1844                 /* Make sure that anybody stopping the queue after this
1845                  * sees the new next_to_clean. */
1846                 smp_mb();
1847
1848                 if (netif_queue_stopped(netdev) &&
1849                     !(test_bit(__IXGB_DOWN, &adapter->flags))) {
1850                         netif_wake_queue(netdev);
1851                         ++adapter->restart_queue;
1852                 }
1853         }
1854
1855         if (adapter->detect_tx_hung) {
1856                 /* detect a transmit hang in hardware, this serializes the
1857                  * check with the clearing of time_stamp and movement of i */
1858                 adapter->detect_tx_hung = false;
1859                 if (tx_ring->buffer_info[eop].time_stamp &&
1860                    time_after(jiffies, tx_ring->buffer_info[eop].time_stamp + HZ)
1861                    && !(IXGB_READ_REG(&adapter->hw, STATUS) &
1862                         IXGB_STATUS_TXOFF)) {
1863                         /* detected Tx unit hang */
1864                         netif_err(adapter, drv, adapter->netdev,
1865                                   "Detected Tx Unit Hang\n"
1866                                   "  TDH                  <%x>\n"
1867                                   "  TDT                  <%x>\n"
1868                                   "  next_to_use          <%x>\n"
1869                                   "  next_to_clean        <%x>\n"
1870                                   "buffer_info[next_to_clean]\n"
1871                                   "  time_stamp           <%lx>\n"
1872                                   "  next_to_watch        <%x>\n"
1873                                   "  jiffies              <%lx>\n"
1874                                   "  next_to_watch.status <%x>\n",
1875                                   IXGB_READ_REG(&adapter->hw, TDH),
1876                                   IXGB_READ_REG(&adapter->hw, TDT),
1877                                   tx_ring->next_to_use,
1878                                   tx_ring->next_to_clean,
1879                                   tx_ring->buffer_info[eop].time_stamp,
1880                                   eop,
1881                                   jiffies,
1882                                   eop_desc->status);
1883                         netif_stop_queue(netdev);
1884                 }
1885         }
1886
1887         return cleaned;
1888 }
1889
1890 /**
1891  * ixgb_rx_checksum - Receive Checksum Offload for 82597.
1892  * @adapter: board private structure
1893  * @rx_desc: receive descriptor
1894  * @sk_buff: socket buffer with received data
1895  **/
1896
1897 static void
1898 ixgb_rx_checksum(struct ixgb_adapter *adapter,
1899                  struct ixgb_rx_desc *rx_desc,
1900                  struct sk_buff *skb)
1901 {
1902         /* Ignore Checksum bit is set OR
1903          * TCP Checksum has not been calculated
1904          */
1905         if ((rx_desc->status & IXGB_RX_DESC_STATUS_IXSM) ||
1906            (!(rx_desc->status & IXGB_RX_DESC_STATUS_TCPCS))) {
1907                 skb->ip_summed = CHECKSUM_NONE;
1908                 return;
1909         }
1910
1911         /* At this point we know the hardware did the TCP checksum */
1912         /* now look at the TCP checksum error bit */
1913         if (rx_desc->errors & IXGB_RX_DESC_ERRORS_TCPE) {
1914                 /* let the stack verify checksum errors */
1915                 skb->ip_summed = CHECKSUM_NONE;
1916                 adapter->hw_csum_rx_error++;
1917         } else {
1918                 /* TCP checksum is good */
1919                 skb->ip_summed = CHECKSUM_UNNECESSARY;
1920                 adapter->hw_csum_rx_good++;
1921         }
1922 }
1923
1924 /*
1925  * this should improve performance for small packets with large amounts
1926  * of reassembly being done in the stack
1927  */
1928 static void ixgb_check_copybreak(struct net_device *netdev,
1929                                  struct ixgb_buffer *buffer_info,
1930                                  u32 length, struct sk_buff **skb)
1931 {
1932         struct sk_buff *new_skb;
1933
1934         if (length > copybreak)
1935                 return;
1936
1937         new_skb = netdev_alloc_skb_ip_align(netdev, length);
1938         if (!new_skb)
1939                 return;
1940
1941         skb_copy_to_linear_data_offset(new_skb, -NET_IP_ALIGN,
1942                                        (*skb)->data - NET_IP_ALIGN,
1943                                        length + NET_IP_ALIGN);
1944         /* save the skb in buffer_info as good */
1945         buffer_info->skb = *skb;
1946         *skb = new_skb;
1947 }
1948
1949 /**
1950  * ixgb_clean_rx_irq - Send received data up the network stack,
1951  * @adapter: board private structure
1952  **/
1953
1954 static bool
1955 ixgb_clean_rx_irq(struct ixgb_adapter *adapter, int *work_done, int work_to_do)
1956 {
1957         struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
1958         struct net_device *netdev = adapter->netdev;
1959         struct pci_dev *pdev = adapter->pdev;
1960         struct ixgb_rx_desc *rx_desc, *next_rxd;
1961         struct ixgb_buffer *buffer_info, *next_buffer, *next2_buffer;
1962         u32 length;
1963         unsigned int i, j;
1964         int cleaned_count = 0;
1965         bool cleaned = false;
1966
1967         i = rx_ring->next_to_clean;
1968         rx_desc = IXGB_RX_DESC(*rx_ring, i);
1969         buffer_info = &rx_ring->buffer_info[i];
1970
1971         while (rx_desc->status & IXGB_RX_DESC_STATUS_DD) {
1972                 struct sk_buff *skb;
1973                 u8 status;
1974
1975                 if (*work_done >= work_to_do)
1976                         break;
1977
1978                 (*work_done)++;
1979                 status = rx_desc->status;
1980                 skb = buffer_info->skb;
1981                 buffer_info->skb = NULL;
1982
1983                 prefetch(skb->data - NET_IP_ALIGN);
1984
1985                 if (++i == rx_ring->count)
1986                         i = 0;
1987                 next_rxd = IXGB_RX_DESC(*rx_ring, i);
1988                 prefetch(next_rxd);
1989
1990                 j = i + 1;
1991                 if (j == rx_ring->count)
1992                         j = 0;
1993                 next2_buffer = &rx_ring->buffer_info[j];
1994                 prefetch(next2_buffer);
1995
1996                 next_buffer = &rx_ring->buffer_info[i];
1997
1998                 cleaned = true;
1999                 cleaned_count++;
2000
2001                 dma_unmap_single(&pdev->dev,
2002                                  buffer_info->dma,
2003                                  buffer_info->length,
2004                                  DMA_FROM_DEVICE);
2005                 buffer_info->dma = 0;
2006
2007                 length = le16_to_cpu(rx_desc->length);
2008                 rx_desc->length = 0;
2009
2010                 if (unlikely(!(status & IXGB_RX_DESC_STATUS_EOP))) {
2011
2012                         /* All receives must fit into a single buffer */
2013
2014                         IXGB_DBG("Receive packet consumed multiple buffers "
2015                                          "length<%x>\n", length);
2016
2017                         dev_kfree_skb_irq(skb);
2018                         goto rxdesc_done;
2019                 }
2020
2021                 if (unlikely(rx_desc->errors &
2022                     (IXGB_RX_DESC_ERRORS_CE | IXGB_RX_DESC_ERRORS_SE |
2023                      IXGB_RX_DESC_ERRORS_P | IXGB_RX_DESC_ERRORS_RXE))) {
2024                         dev_kfree_skb_irq(skb);
2025                         goto rxdesc_done;
2026                 }
2027
2028                 ixgb_check_copybreak(netdev, buffer_info, length, &skb);
2029
2030                 /* Good Receive */
2031                 skb_put(skb, length);
2032
2033                 /* Receive Checksum Offload */
2034                 ixgb_rx_checksum(adapter, rx_desc, skb);
2035
2036                 skb->protocol = eth_type_trans(skb, netdev);
2037                 if (adapter->vlgrp && (status & IXGB_RX_DESC_STATUS_VP)) {
2038                         vlan_hwaccel_receive_skb(skb, adapter->vlgrp,
2039                                                 le16_to_cpu(rx_desc->special));
2040                 } else {
2041                         netif_receive_skb(skb);
2042                 }
2043
2044 rxdesc_done:
2045                 /* clean up descriptor, might be written over by hw */
2046                 rx_desc->status = 0;
2047
2048                 /* return some buffers to hardware, one at a time is too slow */
2049                 if (unlikely(cleaned_count >= IXGB_RX_BUFFER_WRITE)) {
2050                         ixgb_alloc_rx_buffers(adapter, cleaned_count);
2051                         cleaned_count = 0;
2052                 }
2053
2054                 /* use prefetched values */
2055                 rx_desc = next_rxd;
2056                 buffer_info = next_buffer;
2057         }
2058
2059         rx_ring->next_to_clean = i;
2060
2061         cleaned_count = IXGB_DESC_UNUSED(rx_ring);
2062         if (cleaned_count)
2063                 ixgb_alloc_rx_buffers(adapter, cleaned_count);
2064
2065         return cleaned;
2066 }
2067
2068 /**
2069  * ixgb_alloc_rx_buffers - Replace used receive buffers
2070  * @adapter: address of board private structure
2071  **/
2072
2073 static void
2074 ixgb_alloc_rx_buffers(struct ixgb_adapter *adapter, int cleaned_count)
2075 {
2076         struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
2077         struct net_device *netdev = adapter->netdev;
2078         struct pci_dev *pdev = adapter->pdev;
2079         struct ixgb_rx_desc *rx_desc;
2080         struct ixgb_buffer *buffer_info;
2081         struct sk_buff *skb;
2082         unsigned int i;
2083         long cleancount;
2084
2085         i = rx_ring->next_to_use;
2086         buffer_info = &rx_ring->buffer_info[i];
2087         cleancount = IXGB_DESC_UNUSED(rx_ring);
2088
2089
2090         /* leave three descriptors unused */
2091         while (--cleancount > 2 && cleaned_count--) {
2092                 /* recycle! its good for you */
2093                 skb = buffer_info->skb;
2094                 if (skb) {
2095                         skb_trim(skb, 0);
2096                         goto map_skb;
2097                 }
2098
2099                 skb = netdev_alloc_skb_ip_align(netdev, adapter->rx_buffer_len);
2100                 if (unlikely(!skb)) {
2101                         /* Better luck next round */
2102                         adapter->alloc_rx_buff_failed++;
2103                         break;
2104                 }
2105
2106                 buffer_info->skb = skb;
2107                 buffer_info->length = adapter->rx_buffer_len;
2108 map_skb:
2109                 buffer_info->dma = dma_map_single(&pdev->dev,
2110                                                   skb->data,
2111                                                   adapter->rx_buffer_len,
2112                                                   DMA_FROM_DEVICE);
2113
2114                 rx_desc = IXGB_RX_DESC(*rx_ring, i);
2115                 rx_desc->buff_addr = cpu_to_le64(buffer_info->dma);
2116                 /* guarantee DD bit not set now before h/w gets descriptor
2117                  * this is the rest of the workaround for h/w double
2118                  * writeback. */
2119                 rx_desc->status = 0;
2120
2121
2122                 if (++i == rx_ring->count) i = 0;
2123                 buffer_info = &rx_ring->buffer_info[i];
2124         }
2125
2126         if (likely(rx_ring->next_to_use != i)) {
2127                 rx_ring->next_to_use = i;
2128                 if (unlikely(i-- == 0))
2129                         i = (rx_ring->count - 1);
2130
2131                 /* Force memory writes to complete before letting h/w
2132                  * know there are new descriptors to fetch.  (Only
2133                  * applicable for weak-ordered memory model archs, such
2134                  * as IA-64). */
2135                 wmb();
2136                 IXGB_WRITE_REG(&adapter->hw, RDT, i);
2137         }
2138 }
2139
2140 /**
2141  * ixgb_vlan_rx_register - enables or disables vlan tagging/stripping.
2142  *
2143  * @param netdev network interface device structure
2144  * @param grp indicates to enable or disable tagging/stripping
2145  **/
2146 static void
2147 ixgb_vlan_rx_register(struct net_device *netdev, struct vlan_group *grp)
2148 {
2149         struct ixgb_adapter *adapter = netdev_priv(netdev);
2150         u32 ctrl, rctl;
2151
2152         ixgb_irq_disable(adapter);
2153         adapter->vlgrp = grp;
2154
2155         if (grp) {
2156                 /* enable VLAN tag insert/strip */
2157                 ctrl = IXGB_READ_REG(&adapter->hw, CTRL0);
2158                 ctrl |= IXGB_CTRL0_VME;
2159                 IXGB_WRITE_REG(&adapter->hw, CTRL0, ctrl);
2160
2161                 /* enable VLAN receive filtering */
2162
2163                 rctl = IXGB_READ_REG(&adapter->hw, RCTL);
2164                 rctl &= ~IXGB_RCTL_CFIEN;
2165                 IXGB_WRITE_REG(&adapter->hw, RCTL, rctl);
2166         } else {
2167                 /* disable VLAN tag insert/strip */
2168
2169                 ctrl = IXGB_READ_REG(&adapter->hw, CTRL0);
2170                 ctrl &= ~IXGB_CTRL0_VME;
2171                 IXGB_WRITE_REG(&adapter->hw, CTRL0, ctrl);
2172         }
2173
2174         /* don't enable interrupts unless we are UP */
2175         if (adapter->netdev->flags & IFF_UP)
2176                 ixgb_irq_enable(adapter);
2177 }
2178
2179 static void
2180 ixgb_vlan_rx_add_vid(struct net_device *netdev, u16 vid)
2181 {
2182         struct ixgb_adapter *adapter = netdev_priv(netdev);
2183         u32 vfta, index;
2184
2185         /* add VID to filter table */
2186
2187         index = (vid >> 5) & 0x7F;
2188         vfta = IXGB_READ_REG_ARRAY(&adapter->hw, VFTA, index);
2189         vfta |= (1 << (vid & 0x1F));
2190         ixgb_write_vfta(&adapter->hw, index, vfta);
2191 }
2192
2193 static void
2194 ixgb_vlan_rx_kill_vid(struct net_device *netdev, u16 vid)
2195 {
2196         struct ixgb_adapter *adapter = netdev_priv(netdev);
2197         u32 vfta, index;
2198
2199         ixgb_irq_disable(adapter);
2200
2201         vlan_group_set_device(adapter->vlgrp, vid, NULL);
2202
2203         /* don't enable interrupts unless we are UP */
2204         if (adapter->netdev->flags & IFF_UP)
2205                 ixgb_irq_enable(adapter);
2206
2207         /* remove VID from filter table */
2208
2209         index = (vid >> 5) & 0x7F;
2210         vfta = IXGB_READ_REG_ARRAY(&adapter->hw, VFTA, index);
2211         vfta &= ~(1 << (vid & 0x1F));
2212         ixgb_write_vfta(&adapter->hw, index, vfta);
2213 }
2214
2215 static void
2216 ixgb_restore_vlan(struct ixgb_adapter *adapter)
2217 {
2218         ixgb_vlan_rx_register(adapter->netdev, adapter->vlgrp);
2219
2220         if (adapter->vlgrp) {
2221                 u16 vid;
2222                 for (vid = 0; vid < VLAN_GROUP_ARRAY_LEN; vid++) {
2223                         if (!vlan_group_get_device(adapter->vlgrp, vid))
2224                                 continue;
2225                         ixgb_vlan_rx_add_vid(adapter->netdev, vid);
2226                 }
2227         }
2228 }
2229
2230 #ifdef CONFIG_NET_POLL_CONTROLLER
2231 /*
2232  * Polling 'interrupt' - used by things like netconsole to send skbs
2233  * without having to re-enable interrupts. It's not called while
2234  * the interrupt routine is executing.
2235  */
2236
2237 static void ixgb_netpoll(struct net_device *dev)
2238 {
2239         struct ixgb_adapter *adapter = netdev_priv(dev);
2240
2241         disable_irq(adapter->pdev->irq);
2242         ixgb_intr(adapter->pdev->irq, dev);
2243         enable_irq(adapter->pdev->irq);
2244 }
2245 #endif
2246
2247 /**
2248  * ixgb_io_error_detected() - called when PCI error is detected
2249  * @pdev    pointer to pci device with error
2250  * @state   pci channel state after error
2251  *
2252  * This callback is called by the PCI subsystem whenever
2253  * a PCI bus error is detected.
2254  */
2255 static pci_ers_result_t ixgb_io_error_detected(struct pci_dev *pdev,
2256                                                enum pci_channel_state state)
2257 {
2258         struct net_device *netdev = pci_get_drvdata(pdev);
2259         struct ixgb_adapter *adapter = netdev_priv(netdev);
2260
2261         netif_device_detach(netdev);
2262
2263         if (state == pci_channel_io_perm_failure)
2264                 return PCI_ERS_RESULT_DISCONNECT;
2265
2266         if (netif_running(netdev))
2267                 ixgb_down(adapter, true);
2268
2269         pci_disable_device(pdev);
2270
2271         /* Request a slot reset. */
2272         return PCI_ERS_RESULT_NEED_RESET;
2273 }
2274
2275 /**
2276  * ixgb_io_slot_reset - called after the pci bus has been reset.
2277  * @pdev    pointer to pci device with error
2278  *
2279  * This callback is called after the PCI bus has been reset.
2280  * Basically, this tries to restart the card from scratch.
2281  * This is a shortened version of the device probe/discovery code,
2282  * it resembles the first-half of the ixgb_probe() routine.
2283  */
2284 static pci_ers_result_t ixgb_io_slot_reset(struct pci_dev *pdev)
2285 {
2286         struct net_device *netdev = pci_get_drvdata(pdev);
2287         struct ixgb_adapter *adapter = netdev_priv(netdev);
2288
2289         if (pci_enable_device(pdev)) {
2290                 netif_err(adapter, probe, adapter->netdev,
2291                           "Cannot re-enable PCI device after reset\n");
2292                 return PCI_ERS_RESULT_DISCONNECT;
2293         }
2294
2295         /* Perform card reset only on one instance of the card */
2296         if (0 != PCI_FUNC (pdev->devfn))
2297                 return PCI_ERS_RESULT_RECOVERED;
2298
2299         pci_set_master(pdev);
2300
2301         netif_carrier_off(netdev);
2302         netif_stop_queue(netdev);
2303         ixgb_reset(adapter);
2304
2305         /* Make sure the EEPROM is good */
2306         if (!ixgb_validate_eeprom_checksum(&adapter->hw)) {
2307                 netif_err(adapter, probe, adapter->netdev,
2308                           "After reset, the EEPROM checksum is not valid\n");
2309                 return PCI_ERS_RESULT_DISCONNECT;
2310         }
2311         ixgb_get_ee_mac_addr(&adapter->hw, netdev->dev_addr);
2312         memcpy(netdev->perm_addr, netdev->dev_addr, netdev->addr_len);
2313
2314         if (!is_valid_ether_addr(netdev->perm_addr)) {
2315                 netif_err(adapter, probe, adapter->netdev,
2316                           "After reset, invalid MAC address\n");
2317                 return PCI_ERS_RESULT_DISCONNECT;
2318         }
2319
2320         return PCI_ERS_RESULT_RECOVERED;
2321 }
2322
2323 /**
2324  * ixgb_io_resume - called when its OK to resume normal operations
2325  * @pdev    pointer to pci device with error
2326  *
2327  * The error recovery driver tells us that its OK to resume
2328  * normal operation. Implementation resembles the second-half
2329  * of the ixgb_probe() routine.
2330  */
2331 static void ixgb_io_resume(struct pci_dev *pdev)
2332 {
2333         struct net_device *netdev = pci_get_drvdata(pdev);
2334         struct ixgb_adapter *adapter = netdev_priv(netdev);
2335
2336         pci_set_master(pdev);
2337
2338         if (netif_running(netdev)) {
2339                 if (ixgb_up(adapter)) {
2340                         pr_err("can't bring device back up after reset\n");
2341                         return;
2342                 }
2343         }
2344
2345         netif_device_attach(netdev);
2346         mod_timer(&adapter->watchdog_timer, jiffies);
2347 }
2348
2349 /* ixgb_main.c */