Pileus Git - ~andy/linux/blob - 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_strip_enable(struct ixgb_adapter *adapter);
 102 static void ixgb_vlan_strip_disable(struct ixgb_adapter *adapter);
 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_add_vid    = ixgb_vlan_rx_add_vid,
 338         .ndo_vlan_rx_kill_vid   = ixgb_vlan_rx_kill_vid,
 339 #ifdef CONFIG_NET_POLL_CONTROLLER
 340         .ndo_poll_controller    = ixgb_netpoll,
 341 #endif
 342 };
 343
 344 /**
 345  * ixgb_probe - Device Initialization Routine
 346  * @pdev: PCI device information struct
 347  * @ent: entry in ixgb_pci_tbl
 348  *
 349  * Returns 0 on success, negative on failure
 350  *
 351  * ixgb_probe initializes an adapter identified by a pci_dev structure.
 352  * The OS initialization, configuring of the adapter private structure,
 353  * and a hardware reset occur.
 354  **/
 355
 356 static int __devinit
 357 ixgb_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
 358 {
 359         struct net_device *netdev = NULL;
 360         struct ixgb_adapter *adapter;
 361         static int cards_found = 0;
 362         int pci_using_dac;
 363         int i;
 364         int err;
 365
 366         err = pci_enable_device(pdev);
 367         if (err)
 368                 return err;
 369
 370         pci_using_dac = 0;
 371         err = dma_set_mask(&pdev->dev, DMA_BIT_MASK(64));
 372         if (!err) {
 373                 err = dma_set_coherent_mask(&pdev->dev, DMA_BIT_MASK(64));
 374                 if (!err)
 375                         pci_using_dac = 1;
 376         } else {
 377                 err = dma_set_mask(&pdev->dev, DMA_BIT_MASK(32));
 378                 if (err) {
 379                         err = dma_set_coherent_mask(&pdev->dev,
 380                                                     DMA_BIT_MASK(32));
 381                         if (err) {
 382                                 pr_err("No usable DMA configuration, aborting\n");
 383                                 goto err_dma_mask;
 384                         }
 385                 }
 386         }
 387
 388         err = pci_request_regions(pdev, ixgb_driver_name);
 389         if (err)
 390                 goto err_request_regions;
 391
 392         pci_set_master(pdev);
 393
 394         netdev = alloc_etherdev(sizeof(struct ixgb_adapter));
 395         if (!netdev) {
 396                 err = -ENOMEM;
 397                 goto err_alloc_etherdev;
 398         }
 399
 400         SET_NETDEV_DEV(netdev, &pdev->dev);
 401
 402         pci_set_drvdata(pdev, netdev);
 403         adapter = netdev_priv(netdev);
 404         adapter->netdev = netdev;
 405         adapter->pdev = pdev;
 406         adapter->hw.back = adapter;
 407         adapter->msg_enable = netif_msg_init(debug, DEFAULT_DEBUG_LEVEL_SHIFT);
 408
 409         adapter->hw.hw_addr = pci_ioremap_bar(pdev, BAR_0);
 410         if (!adapter->hw.hw_addr) {
 411                 err = -EIO;
 412                 goto err_ioremap;
 413         }
 414
 415         for (i = BAR_1; i <= BAR_5; i++) {
 416                 if (pci_resource_len(pdev, i) == 0)
 417                         continue;
 418                 if (pci_resource_flags(pdev, i) & IORESOURCE_IO) {
 419                         adapter->hw.io_base = pci_resource_start(pdev, i);
 420                         break;
 421                 }
 422         }
 423
 424         netdev->netdev_ops = &ixgb_netdev_ops;
 425         ixgb_set_ethtool_ops(netdev);
 426         netdev->watchdog_timeo = 5 * HZ;
 427         netif_napi_add(netdev, &adapter->napi, ixgb_clean, 64);
 428
 429         strncpy(netdev->name, pci_name(pdev), sizeof(netdev->name) - 1);
 430
 431         adapter->bd_number = cards_found;
 432         adapter->link_speed = 0;
 433         adapter->link_duplex = 0;
 434
 435         /* setup the private structure */
 436
 437         err = ixgb_sw_init(adapter);
 438         if (err)
 439                 goto err_sw_init;
 440
 441         netdev->features = NETIF_F_SG |
 442                            NETIF_F_HW_CSUM |
 443                            NETIF_F_HW_VLAN_TX |
 444                            NETIF_F_HW_VLAN_RX |
 445                            NETIF_F_HW_VLAN_FILTER;
 446         netdev->features |= NETIF_F_TSO;
 447
 448         if (pci_using_dac) {
 449                 netdev->features |= NETIF_F_HIGHDMA;
 450                 netdev->vlan_features |= NETIF_F_HIGHDMA;
 451         }
 452
 453         /* make sure the EEPROM is good */
 454
 455         if (!ixgb_validate_eeprom_checksum(&adapter->hw)) {
 456                 netif_err(adapter, probe, adapter->netdev,
 457                           "The EEPROM Checksum Is Not Valid\n");
 458                 err = -EIO;
 459                 goto err_eeprom;
 460         }
 461
 462         ixgb_get_ee_mac_addr(&adapter->hw, netdev->dev_addr);
 463         memcpy(netdev->perm_addr, netdev->dev_addr, netdev->addr_len);
 464
 465         if (!is_valid_ether_addr(netdev->perm_addr)) {
 466                 netif_err(adapter, probe, adapter->netdev, "Invalid MAC Address\n");
 467                 err = -EIO;
 468                 goto err_eeprom;
 469         }
 470
 471         adapter->part_num = ixgb_get_ee_pba_number(&adapter->hw);
 472
 473         init_timer(&adapter->watchdog_timer);
 474         adapter->watchdog_timer.function = ixgb_watchdog;
 475         adapter->watchdog_timer.data = (unsigned long)adapter;
 476
 477         INIT_WORK(&adapter->tx_timeout_task, ixgb_tx_timeout_task);
 478
 479         strcpy(netdev->name, "eth%d");
 480         err = register_netdev(netdev);
 481         if (err)
 482                 goto err_register;
 483
 484         /* carrier off reporting is important to ethtool even BEFORE open */
 485         netif_carrier_off(netdev);
 486
 487         netif_info(adapter, probe, adapter->netdev,
 488                    "Intel(R) PRO/10GbE Network Connection\n");
 489         ixgb_check_options(adapter);
 490         /* reset the hardware with the new settings */
 491
 492         ixgb_reset(adapter);
 493
 494         cards_found++;
 495         return 0;
 496
 497 err_register:
 498 err_sw_init:
 499 err_eeprom:
 500         iounmap(adapter->hw.hw_addr);
 501 err_ioremap:
 502         free_netdev(netdev);
 503 err_alloc_etherdev:
 504         pci_release_regions(pdev);
 505 err_request_regions:
 506 err_dma_mask:
 507         pci_disable_device(pdev);
 508         return err;
 509 }
 510
 511 /**
 512  * ixgb_remove - Device Removal Routine
 513  * @pdev: PCI device information struct
 514  *
 515  * ixgb_remove is called by the PCI subsystem to alert the driver
 516  * that it should release a PCI device.  The could be caused by a
 517  * Hot-Plug event, or because the driver is going to be removed from
 518  * memory.
 519  **/
 520
 521 static void __devexit
 522 ixgb_remove(struct pci_dev *pdev)
 523 {
 524         struct net_device *netdev = pci_get_drvdata(pdev);
 525         struct ixgb_adapter *adapter = netdev_priv(netdev);
 526
 527         cancel_work_sync(&adapter->tx_timeout_task);
 528
 529         unregister_netdev(netdev);
 530
 531         iounmap(adapter->hw.hw_addr);
 532         pci_release_regions(pdev);
 533
 534         free_netdev(netdev);
 535         pci_disable_device(pdev);
 536 }
 537
 538 /**
 539  * ixgb_sw_init - Initialize general software structures (struct ixgb_adapter)
 540  * @adapter: board private structure to initialize
 541  *
 542  * ixgb_sw_init initializes the Adapter private data structure.
 543  * Fields are initialized based on PCI device information and
 544  * OS network device settings (MTU size).
 545  **/
 546
 547 static int __devinit
 548 ixgb_sw_init(struct ixgb_adapter *adapter)
 549 {
 550         struct ixgb_hw *hw = &adapter->hw;
 551         struct net_device *netdev = adapter->netdev;
 552         struct pci_dev *pdev = adapter->pdev;
 553
 554         /* PCI config space info */
 555
 556         hw->vendor_id = pdev->vendor;
 557         hw->device_id = pdev->device;
 558         hw->subsystem_vendor_id = pdev->subsystem_vendor;
 559         hw->subsystem_id = pdev->subsystem_device;
 560
 561         hw->max_frame_size = netdev->mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;
 562         adapter->rx_buffer_len = hw->max_frame_size + 8; /* + 8 for errata */
 563
 564         if ((hw->device_id == IXGB_DEVICE_ID_82597EX) ||
 565             (hw->device_id == IXGB_DEVICE_ID_82597EX_CX4) ||
 566             (hw->device_id == IXGB_DEVICE_ID_82597EX_LR) ||
 567             (hw->device_id == IXGB_DEVICE_ID_82597EX_SR))
 568                 hw->mac_type = ixgb_82597;
 569         else {
 570                 /* should never have loaded on this device */
 571                 netif_err(adapter, probe, adapter->netdev, "unsupported device id\n");
 572         }
 573
 574         /* enable flow control to be programmed */
 575         hw->fc.send_xon = 1;
 576
 577         set_bit(__IXGB_DOWN, &adapter->flags);
 578         return 0;
 579 }
 580
 581 /**
 582  * ixgb_open - Called when a network interface is made active
 583  * @netdev: network interface device structure
 584  *
 585  * Returns 0 on success, negative value on failure
 586  *
 587  * The open entry point is called when a network interface is made
 588  * active by the system (IFF_UP).  At this point all resources needed
 589  * for transmit and receive operations are allocated, the interrupt
 590  * handler is registered with the OS, the watchdog timer is started,
 591  * and the stack is notified that the interface is ready.
 592  **/
 593
 594 static int
 595 ixgb_open(struct net_device *netdev)
 596 {
 597         struct ixgb_adapter *adapter = netdev_priv(netdev);
 598         int err;
 599
 600         /* allocate transmit descriptors */
 601         err = ixgb_setup_tx_resources(adapter);
 602         if (err)
 603                 goto err_setup_tx;
 604
 605         netif_carrier_off(netdev);
 606
 607         /* allocate receive descriptors */
 608
 609         err = ixgb_setup_rx_resources(adapter);
 610         if (err)
 611                 goto err_setup_rx;
 612
 613         err = ixgb_up(adapter);
 614         if (err)
 615                 goto err_up;
 616
 617         netif_start_queue(netdev);
 618
 619         return 0;
 620
 621 err_up:
 622         ixgb_free_rx_resources(adapter);
 623 err_setup_rx:
 624         ixgb_free_tx_resources(adapter);
 625 err_setup_tx:
 626         ixgb_reset(adapter);
 627
 628         return err;
 629 }
 630
 631 /**
 632  * ixgb_close - Disables a network interface
 633  * @netdev: network interface device structure
 634  *
 635  * Returns 0, this is not allowed to fail
 636  *
 637  * The close entry point is called when an interface is de-activated
 638  * by the OS.  The hardware is still under the drivers control, but
 639  * needs to be disabled.  A global MAC reset is issued to stop the
 640  * hardware, and all transmit and receive resources are freed.
 641  **/
 642
 643 static int
 644 ixgb_close(struct net_device *netdev)
 645 {
 646         struct ixgb_adapter *adapter = netdev_priv(netdev);
 647
 648         ixgb_down(adapter, true);
 649
 650         ixgb_free_tx_resources(adapter);
 651         ixgb_free_rx_resources(adapter);
 652
 653         return 0;
 654 }
 655
 656 /**
 657  * ixgb_setup_tx_resources - allocate Tx resources (Descriptors)
 658  * @adapter: board private structure
 659  *
 660  * Return 0 on success, negative on failure
 661  **/
 662
 663 int
 664 ixgb_setup_tx_resources(struct ixgb_adapter *adapter)
 665 {
 666         struct ixgb_desc_ring *txdr = &adapter->tx_ring;
 667         struct pci_dev *pdev = adapter->pdev;
 668         int size;
 669
 670         size = sizeof(struct ixgb_buffer) * txdr->count;
 671         txdr->buffer_info = vzalloc(size);
 672         if (!txdr->buffer_info) {
 673                 netif_err(adapter, probe, adapter->netdev,
 674                           "Unable to allocate transmit descriptor ring memory\n");
 675                 return -ENOMEM;
 676         }
 677
 678         /* round up to nearest 4K */
 679
 680         txdr->size = txdr->count * sizeof(struct ixgb_tx_desc);
 681         txdr->size = ALIGN(txdr->size, 4096);
 682
 683         txdr->desc = dma_alloc_coherent(&pdev->dev, txdr->size, &txdr->dma,
 684                                         GFP_KERNEL);
 685         if (!txdr->desc) {
 686                 vfree(txdr->buffer_info);
 687                 netif_err(adapter, probe, adapter->netdev,
 688                           "Unable to allocate transmit descriptor memory\n");
 689                 return -ENOMEM;
 690         }
 691         memset(txdr->desc, 0, txdr->size);
 692
 693         txdr->next_to_use = 0;
 694         txdr->next_to_clean = 0;
 695
 696         return 0;
 697 }
 698
 699 /**
 700  * ixgb_configure_tx - Configure 82597 Transmit Unit after Reset.
 701  * @adapter: board private structure
 702  *
 703  * Configure the Tx unit of the MAC after a reset.
 704  **/
 705
 706 static void
 707 ixgb_configure_tx(struct ixgb_adapter *adapter)
 708 {
 709         u64 tdba = adapter->tx_ring.dma;
 710         u32 tdlen = adapter->tx_ring.count * sizeof(struct ixgb_tx_desc);
 711         u32 tctl;
 712         struct ixgb_hw *hw = &adapter->hw;
 713
 714         /* Setup the Base and Length of the Tx Descriptor Ring
 715          * tx_ring.dma can be either a 32 or 64 bit value
 716          */
 717
 718         IXGB_WRITE_REG(hw, TDBAL, (tdba & 0x00000000ffffffffULL));
 719         IXGB_WRITE_REG(hw, TDBAH, (tdba >> 32));
 720
 721         IXGB_WRITE_REG(hw, TDLEN, tdlen);
 722
 723         /* Setup the HW Tx Head and Tail descriptor pointers */
 724
 725         IXGB_WRITE_REG(hw, TDH, 0);
 726         IXGB_WRITE_REG(hw, TDT, 0);
 727
 728         /* don't set up txdctl, it induces performance problems if configured
 729          * incorrectly */
 730         /* Set the Tx Interrupt Delay register */
 731
 732         IXGB_WRITE_REG(hw, TIDV, adapter->tx_int_delay);
 733
 734         /* Program the Transmit Control Register */
 735
 736         tctl = IXGB_TCTL_TCE | IXGB_TCTL_TXEN | IXGB_TCTL_TPDE;
 737         IXGB_WRITE_REG(hw, TCTL, tctl);
 738
 739         /* Setup Transmit Descriptor Settings for this adapter */
 740         adapter->tx_cmd_type =
 741                 IXGB_TX_DESC_TYPE |
 742                 (adapter->tx_int_delay_enable ? IXGB_TX_DESC_CMD_IDE : 0);
 743 }
 744
 745 /**
 746  * ixgb_setup_rx_resources - allocate Rx resources (Descriptors)
 747  * @adapter: board private structure
 748  *
 749  * Returns 0 on success, negative on failure
 750  **/
 751
 752 int
 753 ixgb_setup_rx_resources(struct ixgb_adapter *adapter)
 754 {
 755         struct ixgb_desc_ring *rxdr = &adapter->rx_ring;
 756         struct pci_dev *pdev = adapter->pdev;
 757         int size;
 758
 759         size = sizeof(struct ixgb_buffer) * rxdr->count;
 760         rxdr->buffer_info = vzalloc(size);
 761         if (!rxdr->buffer_info) {
 762                 netif_err(adapter, probe, adapter->netdev,
 763                           "Unable to allocate receive descriptor ring\n");
 764                 return -ENOMEM;
 765         }
 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                 /* disable VLAN filtering */
1079                 rctl &= ~IXGB_RCTL_CFIEN;
1080                 rctl &= ~IXGB_RCTL_VFE;
1081         } else {
1082                 if (netdev->flags & IFF_ALLMULTI) {
1083                         rctl |= IXGB_RCTL_MPE;
1084                         rctl &= ~IXGB_RCTL_UPE;
1085                 } else {
1086                         rctl &= ~(IXGB_RCTL_UPE | IXGB_RCTL_MPE);
1087                 }
1088                 /* enable VLAN filtering */
1089                 rctl |= IXGB_RCTL_VFE;
1090                 rctl &= ~IXGB_RCTL_CFIEN;
1091         }
1092
1093         if (netdev_mc_count(netdev) > IXGB_MAX_NUM_MULTICAST_ADDRESSES) {
1094                 rctl |= IXGB_RCTL_MPE;
1095                 IXGB_WRITE_REG(hw, RCTL, rctl);
1096         } else {
1097                 u8 mta[IXGB_MAX_NUM_MULTICAST_ADDRESSES *
1098                             IXGB_ETH_LENGTH_OF_ADDRESS];
1099
1100                 IXGB_WRITE_REG(hw, RCTL, rctl);
1101
1102                 i = 0;
1103                 netdev_for_each_mc_addr(ha, netdev)
1104                         memcpy(&mta[i++ * IXGB_ETH_LENGTH_OF_ADDRESS],
1105                                ha->addr, IXGB_ETH_LENGTH_OF_ADDRESS);
1106
1107                 ixgb_mc_addr_list_update(hw, mta, netdev_mc_count(netdev), 0);
1108         }
1109
1110         if (netdev->features & NETIF_F_HW_VLAN_RX)
1111                 ixgb_vlan_strip_enable(adapter);
1112         else
1113                 ixgb_vlan_strip_disable(adapter);
1114
1115 }
1116
1117 /**
1118  * ixgb_watchdog - Timer Call-back
1119  * @data: pointer to netdev cast into an unsigned long
1120  **/
1121
1122 static void
1123 ixgb_watchdog(unsigned long data)
1124 {
1125         struct ixgb_adapter *adapter = (struct ixgb_adapter *)data;
1126         struct net_device *netdev = adapter->netdev;
1127         struct ixgb_desc_ring *txdr = &adapter->tx_ring;
1128
1129         ixgb_check_for_link(&adapter->hw);
1130
1131         if (ixgb_check_for_bad_link(&adapter->hw)) {
1132                 /* force the reset path */
1133                 netif_stop_queue(netdev);
1134         }
1135
1136         if (adapter->hw.link_up) {
1137                 if (!netif_carrier_ok(netdev)) {
1138                         netdev_info(netdev,
1139                                     "NIC Link is Up 10 Gbps Full Duplex, Flow Control: %s\n",
1140                                     (adapter->hw.fc.type == ixgb_fc_full) ?
1141                                     "RX/TX" :
1142                                     (adapter->hw.fc.type == ixgb_fc_rx_pause) ?
1143                                      "RX" :
1144                                     (adapter->hw.fc.type == ixgb_fc_tx_pause) ?
1145                                     "TX" : "None");
1146                         adapter->link_speed = 10000;
1147                         adapter->link_duplex = FULL_DUPLEX;
1148                         netif_carrier_on(netdev);
1149                 }
1150         } else {
1151                 if (netif_carrier_ok(netdev)) {
1152                         adapter->link_speed = 0;
1153                         adapter->link_duplex = 0;
1154                         netdev_info(netdev, "NIC Link is Down\n");
1155                         netif_carrier_off(netdev);
1156                 }
1157         }
1158
1159         ixgb_update_stats(adapter);
1160
1161         if (!netif_carrier_ok(netdev)) {
1162                 if (IXGB_DESC_UNUSED(txdr) + 1 < txdr->count) {
1163                         /* We've lost link, so the controller stops DMA,
1164                          * but we've got queued Tx work that's never going
1165                          * to get done, so reset controller to flush Tx.
1166                          * (Do the reset outside of interrupt context). */
1167                         schedule_work(&adapter->tx_timeout_task);
1168                         /* return immediately since reset is imminent */
1169                         return;
1170                 }
1171         }
1172
1173         /* Force detection of hung controller every watchdog period */
1174         adapter->detect_tx_hung = true;
1175
1176         /* generate an interrupt to force clean up of any stragglers */
1177         IXGB_WRITE_REG(&adapter->hw, ICS, IXGB_INT_TXDW);
1178
1179         /* Reset the timer */
1180         mod_timer(&adapter->watchdog_timer, jiffies + 2 * HZ);
1181 }
1182
1183 #define IXGB_TX_FLAGS_CSUM              0x00000001
1184 #define IXGB_TX_FLAGS_VLAN              0x00000002
1185 #define IXGB_TX_FLAGS_TSO               0x00000004
1186
1187 static int
1188 ixgb_tso(struct ixgb_adapter *adapter, struct sk_buff *skb)
1189 {
1190         struct ixgb_context_desc *context_desc;
1191         unsigned int i;
1192         u8 ipcss, ipcso, tucss, tucso, hdr_len;
1193         u16 ipcse, tucse, mss;
1194         int err;
1195
1196         if (likely(skb_is_gso(skb))) {
1197                 struct ixgb_buffer *buffer_info;
1198                 struct iphdr *iph;
1199
1200                 if (skb_header_cloned(skb)) {
1201                         err = pskb_expand_head(skb, 0, 0, GFP_ATOMIC);
1202                         if (err)
1203                                 return err;
1204                 }
1205
1206                 hdr_len = skb_transport_offset(skb) + tcp_hdrlen(skb);
1207                 mss = skb_shinfo(skb)->gso_size;
1208                 iph = ip_hdr(skb);
1209                 iph->tot_len = 0;
1210                 iph->check = 0;
1211                 tcp_hdr(skb)->check = ~csum_tcpudp_magic(iph->saddr,
1212                                                          iph->daddr, 0,
1213                                                          IPPROTO_TCP, 0);
1214                 ipcss = skb_network_offset(skb);
1215                 ipcso = (void *)&(iph->check) - (void *)skb->data;
1216                 ipcse = skb_transport_offset(skb) - 1;
1217                 tucss = skb_transport_offset(skb);
1218                 tucso = (void *)&(tcp_hdr(skb)->check) - (void *)skb->data;
1219                 tucse = 0;
1220
1221                 i = adapter->tx_ring.next_to_use;
1222                 context_desc = IXGB_CONTEXT_DESC(adapter->tx_ring, i);
1223                 buffer_info = &adapter->tx_ring.buffer_info[i];
1224                 WARN_ON(buffer_info->dma != 0);
1225
1226                 context_desc->ipcss = ipcss;
1227                 context_desc->ipcso = ipcso;
1228                 context_desc->ipcse = cpu_to_le16(ipcse);
1229                 context_desc->tucss = tucss;
1230                 context_desc->tucso = tucso;
1231                 context_desc->tucse = cpu_to_le16(tucse);
1232                 context_desc->mss = cpu_to_le16(mss);
1233                 context_desc->hdr_len = hdr_len;
1234                 context_desc->status = 0;
1235                 context_desc->cmd_type_len = cpu_to_le32(
1236                                                   IXGB_CONTEXT_DESC_TYPE
1237                                                 | IXGB_CONTEXT_DESC_CMD_TSE
1238                                                 | IXGB_CONTEXT_DESC_CMD_IP
1239                                                 | IXGB_CONTEXT_DESC_CMD_TCP
1240                                                 | IXGB_CONTEXT_DESC_CMD_IDE
1241                                                 | (skb->len - (hdr_len)));
1242
1243
1244                 if (++i == adapter->tx_ring.count) i = 0;
1245                 adapter->tx_ring.next_to_use = i;
1246
1247                 return 1;
1248         }
1249
1250         return 0;
1251 }
1252
1253 static bool
1254 ixgb_tx_csum(struct ixgb_adapter *adapter, struct sk_buff *skb)
1255 {
1256         struct ixgb_context_desc *context_desc;
1257         unsigned int i;
1258         u8 css, cso;
1259
1260         if (likely(skb->ip_summed == CHECKSUM_PARTIAL)) {
1261                 struct ixgb_buffer *buffer_info;
1262                 css = skb_checksum_start_offset(skb);
1263                 cso = css + skb->csum_offset;
1264
1265                 i = adapter->tx_ring.next_to_use;
1266                 context_desc = IXGB_CONTEXT_DESC(adapter->tx_ring, i);
1267                 buffer_info = &adapter->tx_ring.buffer_info[i];
1268                 WARN_ON(buffer_info->dma != 0);
1269
1270                 context_desc->tucss = css;
1271                 context_desc->tucso = cso;
1272                 context_desc->tucse = 0;
1273                 /* zero out any previously existing data in one instruction */
1274                 *(u32 *)&(context_desc->ipcss) = 0;
1275                 context_desc->status = 0;
1276                 context_desc->hdr_len = 0;
1277                 context_desc->mss = 0;
1278                 context_desc->cmd_type_len =
1279                         cpu_to_le32(IXGB_CONTEXT_DESC_TYPE
1280                                     | IXGB_TX_DESC_CMD_IDE);
1281
1282                 if (++i == adapter->tx_ring.count) i = 0;
1283                 adapter->tx_ring.next_to_use = i;
1284
1285                 return true;
1286         }
1287
1288         return false;
1289 }
1290
1291 #define IXGB_MAX_TXD_PWR        14
1292 #define IXGB_MAX_DATA_PER_TXD   (1<<IXGB_MAX_TXD_PWR)
1293
1294 static int
1295 ixgb_tx_map(struct ixgb_adapter *adapter, struct sk_buff *skb,
1296             unsigned int first)
1297 {
1298         struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
1299         struct pci_dev *pdev = adapter->pdev;
1300         struct ixgb_buffer *buffer_info;
1301         int len = skb_headlen(skb);
1302         unsigned int offset = 0, size, count = 0, i;
1303         unsigned int mss = skb_shinfo(skb)->gso_size;
1304         unsigned int nr_frags = skb_shinfo(skb)->nr_frags;
1305         unsigned int f;
1306
1307         i = tx_ring->next_to_use;
1308
1309         while (len) {
1310                 buffer_info = &tx_ring->buffer_info[i];
1311                 size = min(len, IXGB_MAX_DATA_PER_TXD);
1312                 /* Workaround for premature desc write-backs
1313                  * in TSO mode.  Append 4-byte sentinel desc */
1314                 if (unlikely(mss && !nr_frags && size == len && size > 8))
1315                         size -= 4;
1316
1317                 buffer_info->length = size;
1318                 WARN_ON(buffer_info->dma != 0);
1319                 buffer_info->time_stamp = jiffies;
1320                 buffer_info->mapped_as_page = false;
1321                 buffer_info->dma = dma_map_single(&pdev->dev,
1322                                                   skb->data + offset,
1323                                                   size, DMA_TO_DEVICE);
1324                 if (dma_mapping_error(&pdev->dev, buffer_info->dma))
1325                         goto dma_error;
1326                 buffer_info->next_to_watch = 0;
1327
1328                 len -= size;
1329                 offset += size;
1330                 count++;
1331                 if (len) {
1332                         i++;
1333                         if (i == tx_ring->count)
1334                                 i = 0;
1335                 }
1336         }
1337
1338         for (f = 0; f < nr_frags; f++) {
1339                 struct skb_frag_struct *frag;
1340
1341                 frag = &skb_shinfo(skb)->frags[f];
1342                 len = frag->size;
1343                 offset = frag->page_offset;
1344
1345                 while (len) {
1346                         i++;
1347                         if (i == tx_ring->count)
1348                                 i = 0;
1349
1350                         buffer_info = &tx_ring->buffer_info[i];
1351                         size = min(len, IXGB_MAX_DATA_PER_TXD);
1352
1353                         /* Workaround for premature desc write-backs
1354                          * in TSO mode.  Append 4-byte sentinel desc */
1355                         if (unlikely(mss && (f == (nr_frags - 1))
1356                                      && size == len && size > 8))
1357                                 size -= 4;
1358
1359                         buffer_info->length = size;
1360                         buffer_info->time_stamp = jiffies;
1361                         buffer_info->mapped_as_page = true;
1362                         buffer_info->dma =
1363                                 dma_map_page(&pdev->dev, frag->page,
1364                                              offset, size, DMA_TO_DEVICE);
1365                         if (dma_mapping_error(&pdev->dev, buffer_info->dma))
1366                                 goto dma_error;
1367                         buffer_info->next_to_watch = 0;
1368
1369                         len -= size;
1370                         offset += size;
1371                         count++;
1372                 }
1373         }
1374         tx_ring->buffer_info[i].skb = skb;
1375         tx_ring->buffer_info[first].next_to_watch = i;
1376
1377         return count;
1378
1379 dma_error:
1380         dev_err(&pdev->dev, "TX DMA map failed\n");
1381         buffer_info->dma = 0;
1382         if (count)
1383                 count--;
1384
1385         while (count--) {
1386                 if (i==0)
1387                         i += tx_ring->count;
1388                 i--;
1389                 buffer_info = &tx_ring->buffer_info[i];
1390                 ixgb_unmap_and_free_tx_resource(adapter, buffer_info);
1391         }
1392
1393         return 0;
1394 }
1395
1396 static void
1397 ixgb_tx_queue(struct ixgb_adapter *adapter, int count, int vlan_id,int tx_flags)
1398 {
1399         struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
1400         struct ixgb_tx_desc *tx_desc = NULL;
1401         struct ixgb_buffer *buffer_info;
1402         u32 cmd_type_len = adapter->tx_cmd_type;
1403         u8 status = 0;
1404         u8 popts = 0;
1405         unsigned int i;
1406
1407         if (tx_flags & IXGB_TX_FLAGS_TSO) {
1408                 cmd_type_len |= IXGB_TX_DESC_CMD_TSE;
1409                 popts |= (IXGB_TX_DESC_POPTS_IXSM | IXGB_TX_DESC_POPTS_TXSM);
1410         }
1411
1412         if (tx_flags & IXGB_TX_FLAGS_CSUM)
1413                 popts |= IXGB_TX_DESC_POPTS_TXSM;
1414
1415         if (tx_flags & IXGB_TX_FLAGS_VLAN)
1416                 cmd_type_len |= IXGB_TX_DESC_CMD_VLE;
1417
1418         i = tx_ring->next_to_use;
1419
1420         while (count--) {
1421                 buffer_info = &tx_ring->buffer_info[i];
1422                 tx_desc = IXGB_TX_DESC(*tx_ring, i);
1423                 tx_desc->buff_addr = cpu_to_le64(buffer_info->dma);
1424                 tx_desc->cmd_type_len =
1425                         cpu_to_le32(cmd_type_len | buffer_info->length);
1426                 tx_desc->status = status;
1427                 tx_desc->popts = popts;
1428                 tx_desc->vlan = cpu_to_le16(vlan_id);
1429
1430                 if (++i == tx_ring->count) i = 0;
1431         }
1432
1433         tx_desc->cmd_type_len |=
1434                 cpu_to_le32(IXGB_TX_DESC_CMD_EOP | IXGB_TX_DESC_CMD_RS);
1435
1436         /* Force memory writes to complete before letting h/w
1437          * know there are new descriptors to fetch.  (Only
1438          * applicable for weak-ordered memory model archs,
1439          * such as IA-64). */
1440         wmb();
1441
1442         tx_ring->next_to_use = i;
1443         IXGB_WRITE_REG(&adapter->hw, TDT, i);
1444 }
1445
1446 static int __ixgb_maybe_stop_tx(struct net_device *netdev, int size)
1447 {
1448         struct ixgb_adapter *adapter = netdev_priv(netdev);
1449         struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
1450
1451         netif_stop_queue(netdev);
1452         /* Herbert's original patch had:
1453          *  smp_mb__after_netif_stop_queue();
1454          * but since that doesn't exist yet, just open code it. */
1455         smp_mb();
1456
1457         /* We need to check again in a case another CPU has just
1458          * made room available. */
1459         if (likely(IXGB_DESC_UNUSED(tx_ring) < size))
1460                 return -EBUSY;
1461
1462         /* A reprieve! */
1463         netif_start_queue(netdev);
1464         ++adapter->restart_queue;
1465         return 0;
1466 }
1467
1468 static int ixgb_maybe_stop_tx(struct net_device *netdev,
1469                               struct ixgb_desc_ring *tx_ring, int size)
1470 {
1471         if (likely(IXGB_DESC_UNUSED(tx_ring) >= size))
1472                 return 0;
1473         return __ixgb_maybe_stop_tx(netdev, size);
1474 }
1475
1476
1477 /* Tx Descriptors needed, worst case */
1478 #define TXD_USE_COUNT(S) (((S) >> IXGB_MAX_TXD_PWR) + \
1479                          (((S) & (IXGB_MAX_DATA_PER_TXD - 1)) ? 1 : 0))
1480 #define DESC_NEEDED TXD_USE_COUNT(IXGB_MAX_DATA_PER_TXD) /* skb->date */ + \
1481         MAX_SKB_FRAGS * TXD_USE_COUNT(PAGE_SIZE) + 1 /* for context */ \
1482         + 1 /* one more needed for sentinel TSO workaround */
1483
1484 static netdev_tx_t
1485 ixgb_xmit_frame(struct sk_buff *skb, struct net_device *netdev)
1486 {
1487         struct ixgb_adapter *adapter = netdev_priv(netdev);
1488         unsigned int first;
1489         unsigned int tx_flags = 0;
1490         int vlan_id = 0;
1491         int count = 0;
1492         int tso;
1493
1494         if (test_bit(__IXGB_DOWN, &adapter->flags)) {
1495                 dev_kfree_skb(skb);
1496                 return NETDEV_TX_OK;
1497         }
1498
1499         if (skb->len <= 0) {
1500                 dev_kfree_skb(skb);
1501                 return NETDEV_TX_OK;
1502         }
1503
1504         if (unlikely(ixgb_maybe_stop_tx(netdev, &adapter->tx_ring,
1505                      DESC_NEEDED)))
1506                 return NETDEV_TX_BUSY;
1507
1508         if (vlan_tx_tag_present(skb)) {
1509                 tx_flags |= IXGB_TX_FLAGS_VLAN;
1510                 vlan_id = vlan_tx_tag_get(skb);
1511         }
1512
1513         first = adapter->tx_ring.next_to_use;
1514
1515         tso = ixgb_tso(adapter, skb);
1516         if (tso < 0) {
1517                 dev_kfree_skb(skb);
1518                 return NETDEV_TX_OK;
1519         }
1520
1521         if (likely(tso))
1522                 tx_flags |= IXGB_TX_FLAGS_TSO;
1523         else if (ixgb_tx_csum(adapter, skb))
1524                 tx_flags |= IXGB_TX_FLAGS_CSUM;
1525
1526         count = ixgb_tx_map(adapter, skb, first);
1527
1528         if (count) {
1529                 ixgb_tx_queue(adapter, count, vlan_id, tx_flags);
1530                 /* Make sure there is space in the ring for the next send. */
1531                 ixgb_maybe_stop_tx(netdev, &adapter->tx_ring, DESC_NEEDED);
1532
1533         } else {
1534                 dev_kfree_skb_any(skb);
1535                 adapter->tx_ring.buffer_info[first].time_stamp = 0;
1536                 adapter->tx_ring.next_to_use = first;
1537         }
1538
1539         return NETDEV_TX_OK;
1540 }
1541
1542 /**
1543  * ixgb_tx_timeout - Respond to a Tx Hang
1544  * @netdev: network interface device structure
1545  **/
1546
1547 static void
1548 ixgb_tx_timeout(struct net_device *netdev)
1549 {
1550         struct ixgb_adapter *adapter = netdev_priv(netdev);
1551
1552         /* Do the reset outside of interrupt context */
1553         schedule_work(&adapter->tx_timeout_task);
1554 }
1555
1556 static void
1557 ixgb_tx_timeout_task(struct work_struct *work)
1558 {
1559         struct ixgb_adapter *adapter =
1560                 container_of(work, struct ixgb_adapter, tx_timeout_task);
1561
1562         adapter->tx_timeout_count++;
1563         ixgb_down(adapter, true);
1564         ixgb_up(adapter);
1565 }
1566
1567 /**
1568  * ixgb_get_stats - Get System Network Statistics
1569  * @netdev: network interface device structure
1570  *
1571  * Returns the address of the device statistics structure.
1572  * The statistics are actually updated from the timer callback.
1573  **/
1574
1575 static struct net_device_stats *
1576 ixgb_get_stats(struct net_device *netdev)
1577 {
1578         return &netdev->stats;
1579 }
1580
1581 /**
1582  * ixgb_change_mtu - Change the Maximum Transfer Unit
1583  * @netdev: network interface device structure
1584  * @new_mtu: new value for maximum frame size
1585  *
1586  * Returns 0 on success, negative on failure
1587  **/
1588
1589 static int
1590 ixgb_change_mtu(struct net_device *netdev, int new_mtu)
1591 {
1592         struct ixgb_adapter *adapter = netdev_priv(netdev);
1593         int max_frame = new_mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;
1594         int old_max_frame = netdev->mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;
1595
1596         /* MTU < 68 is an error for IPv4 traffic, just don't allow it */
1597         if ((new_mtu < 68) ||
1598             (max_frame > IXGB_MAX_JUMBO_FRAME_SIZE + ENET_FCS_LENGTH)) {
1599                 netif_err(adapter, probe, adapter->netdev,
1600                           "Invalid MTU setting %d\n", new_mtu);
1601                 return -EINVAL;
1602         }
1603
1604         if (old_max_frame == max_frame)
1605                 return 0;
1606
1607         if (netif_running(netdev))
1608                 ixgb_down(adapter, true);
1609
1610         adapter->rx_buffer_len = max_frame + 8; /* + 8 for errata */
1611
1612         netdev->mtu = new_mtu;
1613
1614         if (netif_running(netdev))
1615                 ixgb_up(adapter);
1616
1617         return 0;
1618 }
1619
1620 /**
1621  * ixgb_update_stats - Update the board statistics counters.
1622  * @adapter: board private structure
1623  **/
1624
1625 void
1626 ixgb_update_stats(struct ixgb_adapter *adapter)
1627 {
1628         struct net_device *netdev = adapter->netdev;
1629         struct pci_dev *pdev = adapter->pdev;
1630
1631         /* Prevent stats update while adapter is being reset */
1632         if (pci_channel_offline(pdev))
1633                 return;
1634
1635         if ((netdev->flags & IFF_PROMISC) || (netdev->flags & IFF_ALLMULTI) ||
1636            (netdev_mc_count(netdev) > IXGB_MAX_NUM_MULTICAST_ADDRESSES)) {
1637                 u64 multi = IXGB_READ_REG(&adapter->hw, MPRCL);
1638                 u32 bcast_l = IXGB_READ_REG(&adapter->hw, BPRCL);
1639                 u32 bcast_h = IXGB_READ_REG(&adapter->hw, BPRCH);
1640                 u64 bcast = ((u64)bcast_h << 32) | bcast_l;
1641
1642                 multi |= ((u64)IXGB_READ_REG(&adapter->hw, MPRCH) << 32);
1643                 /* fix up multicast stats by removing broadcasts */
1644                 if (multi >= bcast)
1645                         multi -= bcast;
1646
1647                 adapter->stats.mprcl += (multi & 0xFFFFFFFF);
1648                 adapter->stats.mprch += (multi >> 32);
1649                 adapter->stats.bprcl += bcast_l;
1650                 adapter->stats.bprch += bcast_h;
1651         } else {
1652                 adapter->stats.mprcl += IXGB_READ_REG(&adapter->hw, MPRCL);
1653                 adapter->stats.mprch += IXGB_READ_REG(&adapter->hw, MPRCH);
1654                 adapter->stats.bprcl += IXGB_READ_REG(&adapter->hw, BPRCL);
1655                 adapter->stats.bprch += IXGB_READ_REG(&adapter->hw, BPRCH);
1656         }
1657         adapter->stats.tprl += IXGB_READ_REG(&adapter->hw, TPRL);
1658         adapter->stats.tprh += IXGB_READ_REG(&adapter->hw, TPRH);
1659         adapter->stats.gprcl += IXGB_READ_REG(&adapter->hw, GPRCL);
1660         adapter->stats.gprch += IXGB_READ_REG(&adapter->hw, GPRCH);
1661         adapter->stats.uprcl += IXGB_READ_REG(&adapter->hw, UPRCL);
1662         adapter->stats.uprch += IXGB_READ_REG(&adapter->hw, UPRCH);
1663         adapter->stats.vprcl += IXGB_READ_REG(&adapter->hw, VPRCL);
1664         adapter->stats.vprch += IXGB_READ_REG(&adapter->hw, VPRCH);
1665         adapter->stats.jprcl += IXGB_READ_REG(&adapter->hw, JPRCL);
1666         adapter->stats.jprch += IXGB_READ_REG(&adapter->hw, JPRCH);
1667         adapter->stats.gorcl += IXGB_READ_REG(&adapter->hw, GORCL);
1668         adapter->stats.gorch += IXGB_READ_REG(&adapter->hw, GORCH);
1669         adapter->stats.torl += IXGB_READ_REG(&adapter->hw, TORL);
1670         adapter->stats.torh += IXGB_READ_REG(&adapter->hw, TORH);
1671         adapter->stats.rnbc += IXGB_READ_REG(&adapter->hw, RNBC);
1672         adapter->stats.ruc += IXGB_READ_REG(&adapter->hw, RUC);
1673         adapter->stats.roc += IXGB_READ_REG(&adapter->hw, ROC);
1674         adapter->stats.rlec += IXGB_READ_REG(&adapter->hw, RLEC);
1675         adapter->stats.crcerrs += IXGB_READ_REG(&adapter->hw, CRCERRS);
1676         adapter->stats.icbc += IXGB_READ_REG(&adapter->hw, ICBC);
1677         adapter->stats.ecbc += IXGB_READ_REG(&adapter->hw, ECBC);
1678         adapter->stats.mpc += IXGB_READ_REG(&adapter->hw, MPC);
1679         adapter->stats.tptl += IXGB_READ_REG(&adapter->hw, TPTL);
1680         adapter->stats.tpth += IXGB_READ_REG(&adapter->hw, TPTH);
1681         adapter->stats.gptcl += IXGB_READ_REG(&adapter->hw, GPTCL);
1682         adapter->stats.gptch += IXGB_READ_REG(&adapter->hw, GPTCH);
1683         adapter->stats.bptcl += IXGB_READ_REG(&adapter->hw, BPTCL);
1684         adapter->stats.bptch += IXGB_READ_REG(&adapter->hw, BPTCH);
1685         adapter->stats.mptcl += IXGB_READ_REG(&adapter->hw, MPTCL);
1686         adapter->stats.mptch += IXGB_READ_REG(&adapter->hw, MPTCH);
1687         adapter->stats.uptcl += IXGB_READ_REG(&adapter->hw, UPTCL);
1688         adapter->stats.uptch += IXGB_READ_REG(&adapter->hw, UPTCH);
1689         adapter->stats.vptcl += IXGB_READ_REG(&adapter->hw, VPTCL);
1690         adapter->stats.vptch += IXGB_READ_REG(&adapter->hw, VPTCH);
1691         adapter->stats.jptcl += IXGB_READ_REG(&adapter->hw, JPTCL);
1692         adapter->stats.jptch += IXGB_READ_REG(&adapter->hw, JPTCH);
1693         adapter->stats.gotcl += IXGB_READ_REG(&adapter->hw, GOTCL);
1694         adapter->stats.gotch += IXGB_READ_REG(&adapter->hw, GOTCH);
1695         adapter->stats.totl += IXGB_READ_REG(&adapter->hw, TOTL);
1696         adapter->stats.toth += IXGB_READ_REG(&adapter->hw, TOTH);
1697         adapter->stats.dc += IXGB_READ_REG(&adapter->hw, DC);
1698         adapter->stats.plt64c += IXGB_READ_REG(&adapter->hw, PLT64C);
1699         adapter->stats.tsctc += IXGB_READ_REG(&adapter->hw, TSCTC);
1700         adapter->stats.tsctfc += IXGB_READ_REG(&adapter->hw, TSCTFC);
1701         adapter->stats.ibic += IXGB_READ_REG(&adapter->hw, IBIC);
1702         adapter->stats.rfc += IXGB_READ_REG(&adapter->hw, RFC);
1703         adapter->stats.lfc += IXGB_READ_REG(&adapter->hw, LFC);
1704         adapter->stats.pfrc += IXGB_READ_REG(&adapter->hw, PFRC);
1705         adapter->stats.pftc += IXGB_READ_REG(&adapter->hw, PFTC);
1706         adapter->stats.mcfrc += IXGB_READ_REG(&adapter->hw, MCFRC);
1707         adapter->stats.mcftc += IXGB_READ_REG(&adapter->hw, MCFTC);
1708         adapter->stats.xonrxc += IXGB_READ_REG(&adapter->hw, XONRXC);
1709         adapter->stats.xontxc += IXGB_READ_REG(&adapter->hw, XONTXC);
1710         adapter->stats.xoffrxc += IXGB_READ_REG(&adapter->hw, XOFFRXC);
1711         adapter->stats.xofftxc += IXGB_READ_REG(&adapter->hw, XOFFTXC);
1712         adapter->stats.rjc += IXGB_READ_REG(&adapter->hw, RJC);
1713
1714         /* Fill out the OS statistics structure */
1715
1716         netdev->stats.rx_packets = adapter->stats.gprcl;
1717         netdev->stats.tx_packets = adapter->stats.gptcl;
1718         netdev->stats.rx_bytes = adapter->stats.gorcl;
1719         netdev->stats.tx_bytes = adapter->stats.gotcl;
1720         netdev->stats.multicast = adapter->stats.mprcl;
1721         netdev->stats.collisions = 0;
1722
1723         /* ignore RLEC as it reports errors for padded (<64bytes) frames
1724          * with a length in the type/len field */
1725         netdev->stats.rx_errors =
1726             /* adapter->stats.rnbc + */ adapter->stats.crcerrs +
1727             adapter->stats.ruc +
1728             adapter->stats.roc /*+ adapter->stats.rlec */  +
1729             adapter->stats.icbc +
1730             adapter->stats.ecbc + adapter->stats.mpc;
1731
1732         /* see above
1733          * netdev->stats.rx_length_errors = adapter->stats.rlec;
1734          */
1735
1736         netdev->stats.rx_crc_errors = adapter->stats.crcerrs;
1737         netdev->stats.rx_fifo_errors = adapter->stats.mpc;
1738         netdev->stats.rx_missed_errors = adapter->stats.mpc;
1739         netdev->stats.rx_over_errors = adapter->stats.mpc;
1740
1741         netdev->stats.tx_errors = 0;
1742         netdev->stats.rx_frame_errors = 0;
1743         netdev->stats.tx_aborted_errors = 0;
1744         netdev->stats.tx_carrier_errors = 0;
1745         netdev->stats.tx_fifo_errors = 0;
1746         netdev->stats.tx_heartbeat_errors = 0;
1747         netdev->stats.tx_window_errors = 0;
1748 }
1749
1750 #define IXGB_MAX_INTR 10
1751 /**
1752  * ixgb_intr - Interrupt Handler
1753  * @irq: interrupt number
1754  * @data: pointer to a network interface device structure
1755  **/
1756
1757 static irqreturn_t
1758 ixgb_intr(int irq, void *data)
1759 {
1760         struct net_device *netdev = data;
1761         struct ixgb_adapter *adapter = netdev_priv(netdev);
1762         struct ixgb_hw *hw = &adapter->hw;
1763         u32 icr = IXGB_READ_REG(hw, ICR);
1764
1765         if (unlikely(!icr))
1766                 return IRQ_NONE;  /* Not our interrupt */
1767
1768         if (unlikely(icr & (IXGB_INT_RXSEQ | IXGB_INT_LSC)))
1769                 if (!test_bit(__IXGB_DOWN, &adapter->flags))
1770                         mod_timer(&adapter->watchdog_timer, jiffies);
1771
1772         if (napi_schedule_prep(&adapter->napi)) {
1773
1774                 /* Disable interrupts and register for poll. The flush
1775                   of the posted write is intentionally left out.
1776                 */
1777
1778                 IXGB_WRITE_REG(&adapter->hw, IMC, ~0);
1779                 __napi_schedule(&adapter->napi);
1780         }
1781         return IRQ_HANDLED;
1782 }
1783
1784 /**
1785  * ixgb_clean - NAPI Rx polling callback
1786  * @adapter: board private structure
1787  **/
1788
1789 static int
1790 ixgb_clean(struct napi_struct *napi, int budget)
1791 {
1792         struct ixgb_adapter *adapter = container_of(napi, struct ixgb_adapter, napi);
1793         int work_done = 0;
1794
1795         ixgb_clean_tx_irq(adapter);
1796         ixgb_clean_rx_irq(adapter, &work_done, budget);
1797
1798         /* If budget not fully consumed, exit the polling mode */
1799         if (work_done < budget) {
1800                 napi_complete(napi);
1801                 if (!test_bit(__IXGB_DOWN, &adapter->flags))
1802                         ixgb_irq_enable(adapter);
1803         }
1804
1805         return work_done;
1806 }
1807
1808 /**
1809  * ixgb_clean_tx_irq - Reclaim resources after transmit completes
1810  * @adapter: board private structure
1811  **/
1812
1813 static bool
1814 ixgb_clean_tx_irq(struct ixgb_adapter *adapter)
1815 {
1816         struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
1817         struct net_device *netdev = adapter->netdev;
1818         struct ixgb_tx_desc *tx_desc, *eop_desc;
1819         struct ixgb_buffer *buffer_info;
1820         unsigned int i, eop;
1821         bool cleaned = false;
1822
1823         i = tx_ring->next_to_clean;
1824         eop = tx_ring->buffer_info[i].next_to_watch;
1825         eop_desc = IXGB_TX_DESC(*tx_ring, eop);
1826
1827         while (eop_desc->status & IXGB_TX_DESC_STATUS_DD) {
1828
1829                 rmb(); /* read buffer_info after eop_desc */
1830                 for (cleaned = false; !cleaned; ) {
1831                         tx_desc = IXGB_TX_DESC(*tx_ring, i);
1832                         buffer_info = &tx_ring->buffer_info[i];
1833
1834                         if (tx_desc->popts &
1835                            (IXGB_TX_DESC_POPTS_TXSM |
1836                             IXGB_TX_DESC_POPTS_IXSM))
1837                                 adapter->hw_csum_tx_good++;
1838
1839                         ixgb_unmap_and_free_tx_resource(adapter, buffer_info);
1840
1841                         *(u32 *)&(tx_desc->status) = 0;
1842
1843                         cleaned = (i == eop);
1844                         if (++i == tx_ring->count) i = 0;
1845                 }
1846
1847                 eop = tx_ring->buffer_info[i].next_to_watch;
1848                 eop_desc = IXGB_TX_DESC(*tx_ring, eop);
1849         }
1850
1851         tx_ring->next_to_clean = i;
1852
1853         if (unlikely(cleaned && netif_carrier_ok(netdev) &&
1854                      IXGB_DESC_UNUSED(tx_ring) >= DESC_NEEDED)) {
1855                 /* Make sure that anybody stopping the queue after this
1856                  * sees the new next_to_clean. */
1857                 smp_mb();
1858
1859                 if (netif_queue_stopped(netdev) &&
1860                     !(test_bit(__IXGB_DOWN, &adapter->flags))) {
1861                         netif_wake_queue(netdev);
1862                         ++adapter->restart_queue;
1863                 }
1864         }
1865
1866         if (adapter->detect_tx_hung) {
1867                 /* detect a transmit hang in hardware, this serializes the
1868                  * check with the clearing of time_stamp and movement of i */
1869                 adapter->detect_tx_hung = false;
1870                 if (tx_ring->buffer_info[eop].time_stamp &&
1871                    time_after(jiffies, tx_ring->buffer_info[eop].time_stamp + HZ)
1872                    && !(IXGB_READ_REG(&adapter->hw, STATUS) &
1873                         IXGB_STATUS_TXOFF)) {
1874                         /* detected Tx unit hang */
1875                         netif_err(adapter, drv, adapter->netdev,
1876                                   "Detected Tx Unit Hang\n"
1877                                   "  TDH                  <%x>\n"
1878                                   "  TDT                  <%x>\n"
1879                                   "  next_to_use          <%x>\n"
1880                                   "  next_to_clean        <%x>\n"
1881                                   "buffer_info[next_to_clean]\n"
1882                                   "  time_stamp           <%lx>\n"
1883                                   "  next_to_watch        <%x>\n"
1884                                   "  jiffies              <%lx>\n"
1885                                   "  next_to_watch.status <%x>\n",
1886                                   IXGB_READ_REG(&adapter->hw, TDH),
1887                                   IXGB_READ_REG(&adapter->hw, TDT),
1888                                   tx_ring->next_to_use,
1889                                   tx_ring->next_to_clean,
1890                                   tx_ring->buffer_info[eop].time_stamp,
1891                                   eop,
1892                                   jiffies,
1893                                   eop_desc->status);
1894                         netif_stop_queue(netdev);
1895                 }
1896         }
1897
1898         return cleaned;
1899 }
1900
1901 /**
1902  * ixgb_rx_checksum - Receive Checksum Offload for 82597.
1903  * @adapter: board private structure
1904  * @rx_desc: receive descriptor
1905  * @sk_buff: socket buffer with received data
1906  **/
1907
1908 static void
1909 ixgb_rx_checksum(struct ixgb_adapter *adapter,
1910                  struct ixgb_rx_desc *rx_desc,
1911                  struct sk_buff *skb)
1912 {
1913         /* Ignore Checksum bit is set OR
1914          * TCP Checksum has not been calculated
1915          */
1916         if ((rx_desc->status & IXGB_RX_DESC_STATUS_IXSM) ||
1917            (!(rx_desc->status & IXGB_RX_DESC_STATUS_TCPCS))) {
1918                 skb_checksum_none_assert(skb);
1919                 return;
1920         }
1921
1922         /* At this point we know the hardware did the TCP checksum */
1923         /* now look at the TCP checksum error bit */
1924         if (rx_desc->errors & IXGB_RX_DESC_ERRORS_TCPE) {
1925                 /* let the stack verify checksum errors */
1926                 skb_checksum_none_assert(skb);
1927                 adapter->hw_csum_rx_error++;
1928         } else {
1929                 /* TCP checksum is good */
1930                 skb->ip_summed = CHECKSUM_UNNECESSARY;
1931                 adapter->hw_csum_rx_good++;
1932         }
1933 }
1934
1935 /*
1936  * this should improve performance for small packets with large amounts
1937  * of reassembly being done in the stack
1938  */
1939 static void ixgb_check_copybreak(struct net_device *netdev,
1940                                  struct ixgb_buffer *buffer_info,
1941                                  u32 length, struct sk_buff **skb)
1942 {
1943         struct sk_buff *new_skb;
1944
1945         if (length > copybreak)
1946                 return;
1947
1948         new_skb = netdev_alloc_skb_ip_align(netdev, length);
1949         if (!new_skb)
1950                 return;
1951
1952         skb_copy_to_linear_data_offset(new_skb, -NET_IP_ALIGN,
1953                                        (*skb)->data - NET_IP_ALIGN,
1954                                        length + NET_IP_ALIGN);
1955         /* save the skb in buffer_info as good */
1956         buffer_info->skb = *skb;
1957         *skb = new_skb;
1958 }
1959
1960 /**
1961  * ixgb_clean_rx_irq - Send received data up the network stack,
1962  * @adapter: board private structure
1963  **/
1964
1965 static bool
1966 ixgb_clean_rx_irq(struct ixgb_adapter *adapter, int *work_done, int work_to_do)
1967 {
1968         struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
1969         struct net_device *netdev = adapter->netdev;
1970         struct pci_dev *pdev = adapter->pdev;
1971         struct ixgb_rx_desc *rx_desc, *next_rxd;
1972         struct ixgb_buffer *buffer_info, *next_buffer, *next2_buffer;
1973         u32 length;
1974         unsigned int i, j;
1975         int cleaned_count = 0;
1976         bool cleaned = false;
1977
1978         i = rx_ring->next_to_clean;
1979         rx_desc = IXGB_RX_DESC(*rx_ring, i);
1980         buffer_info = &rx_ring->buffer_info[i];
1981
1982         while (rx_desc->status & IXGB_RX_DESC_STATUS_DD) {
1983                 struct sk_buff *skb;
1984                 u8 status;
1985
1986                 if (*work_done >= work_to_do)
1987                         break;
1988
1989                 (*work_done)++;
1990                 rmb();  /* read descriptor and rx_buffer_info after status DD */
1991                 status = rx_desc->status;
1992                 skb = buffer_info->skb;
1993                 buffer_info->skb = NULL;
1994
1995                 prefetch(skb->data - NET_IP_ALIGN);
1996
1997                 if (++i == rx_ring->count)
1998                         i = 0;
1999                 next_rxd = IXGB_RX_DESC(*rx_ring, i);
2000                 prefetch(next_rxd);
2001
2002                 j = i + 1;
2003                 if (j == rx_ring->count)
2004                         j = 0;
2005                 next2_buffer = &rx_ring->buffer_info[j];
2006                 prefetch(next2_buffer);
2007
2008                 next_buffer = &rx_ring->buffer_info[i];
2009
2010                 cleaned = true;
2011                 cleaned_count++;
2012
2013                 dma_unmap_single(&pdev->dev,
2014                                  buffer_info->dma,
2015                                  buffer_info->length,
2016                                  DMA_FROM_DEVICE);
2017                 buffer_info->dma = 0;
2018
2019                 length = le16_to_cpu(rx_desc->length);
2020                 rx_desc->length = 0;
2021
2022                 if (unlikely(!(status & IXGB_RX_DESC_STATUS_EOP))) {
2023
2024                         /* All receives must fit into a single buffer */
2025
2026                         IXGB_DBG("Receive packet consumed multiple buffers "
2027                                          "length<%x>\n", length);
2028
2029                         dev_kfree_skb_irq(skb);
2030                         goto rxdesc_done;
2031                 }
2032
2033                 if (unlikely(rx_desc->errors &
2034                     (IXGB_RX_DESC_ERRORS_CE | IXGB_RX_DESC_ERRORS_SE |
2035                      IXGB_RX_DESC_ERRORS_P | IXGB_RX_DESC_ERRORS_RXE))) {
2036                         dev_kfree_skb_irq(skb);
2037                         goto rxdesc_done;
2038                 }
2039
2040                 ixgb_check_copybreak(netdev, buffer_info, length, &skb);
2041
2042                 /* Good Receive */
2043                 skb_put(skb, length);
2044
2045                 /* Receive Checksum Offload */
2046                 ixgb_rx_checksum(adapter, rx_desc, skb);
2047
2048                 skb->protocol = eth_type_trans(skb, netdev);
2049                 if (status & IXGB_RX_DESC_STATUS_VP)
2050                         __vlan_hwaccel_put_tag(skb,
2051                                                le16_to_cpu(rx_desc->special));
2052
2053                 netif_receive_skb(skb);
2054
2055 rxdesc_done:
2056                 /* clean up descriptor, might be written over by hw */
2057                 rx_desc->status = 0;
2058
2059                 /* return some buffers to hardware, one at a time is too slow */
2060                 if (unlikely(cleaned_count >= IXGB_RX_BUFFER_WRITE)) {
2061                         ixgb_alloc_rx_buffers(adapter, cleaned_count);
2062                         cleaned_count = 0;
2063                 }
2064
2065                 /* use prefetched values */
2066                 rx_desc = next_rxd;
2067                 buffer_info = next_buffer;
2068         }
2069
2070         rx_ring->next_to_clean = i;
2071
2072         cleaned_count = IXGB_DESC_UNUSED(rx_ring);
2073         if (cleaned_count)
2074                 ixgb_alloc_rx_buffers(adapter, cleaned_count);
2075
2076         return cleaned;
2077 }
2078
2079 /**
2080  * ixgb_alloc_rx_buffers - Replace used receive buffers
2081  * @adapter: address of board private structure
2082  **/
2083
2084 static void
2085 ixgb_alloc_rx_buffers(struct ixgb_adapter *adapter, int cleaned_count)
2086 {
2087         struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
2088         struct net_device *netdev = adapter->netdev;
2089         struct pci_dev *pdev = adapter->pdev;
2090         struct ixgb_rx_desc *rx_desc;
2091         struct ixgb_buffer *buffer_info;
2092         struct sk_buff *skb;
2093         unsigned int i;
2094         long cleancount;
2095
2096         i = rx_ring->next_to_use;
2097         buffer_info = &rx_ring->buffer_info[i];
2098         cleancount = IXGB_DESC_UNUSED(rx_ring);
2099
2100
2101         /* leave three descriptors unused */
2102         while (--cleancount > 2 && cleaned_count--) {
2103                 /* recycle! its good for you */
2104                 skb = buffer_info->skb;
2105                 if (skb) {
2106                         skb_trim(skb, 0);
2107                         goto map_skb;
2108                 }
2109
2110                 skb = netdev_alloc_skb_ip_align(netdev, adapter->rx_buffer_len);
2111                 if (unlikely(!skb)) {
2112                         /* Better luck next round */
2113                         adapter->alloc_rx_buff_failed++;
2114                         break;
2115                 }
2116
2117                 buffer_info->skb = skb;
2118                 buffer_info->length = adapter->rx_buffer_len;
2119 map_skb:
2120                 buffer_info->dma = dma_map_single(&pdev->dev,
2121                                                   skb->data,
2122                                                   adapter->rx_buffer_len,
2123                                                   DMA_FROM_DEVICE);
2124
2125                 rx_desc = IXGB_RX_DESC(*rx_ring, i);
2126                 rx_desc->buff_addr = cpu_to_le64(buffer_info->dma);
2127                 /* guarantee DD bit not set now before h/w gets descriptor
2128                  * this is the rest of the workaround for h/w double
2129                  * writeback. */
2130                 rx_desc->status = 0;
2131
2132
2133                 if (++i == rx_ring->count) i = 0;
2134                 buffer_info = &rx_ring->buffer_info[i];
2135         }
2136
2137         if (likely(rx_ring->next_to_use != i)) {
2138                 rx_ring->next_to_use = i;
2139                 if (unlikely(i-- == 0))
2140                         i = (rx_ring->count - 1);
2141
2142                 /* Force memory writes to complete before letting h/w
2143                  * know there are new descriptors to fetch.  (Only
2144                  * applicable for weak-ordered memory model archs, such
2145                  * as IA-64). */
2146                 wmb();
2147                 IXGB_WRITE_REG(&adapter->hw, RDT, i);
2148         }
2149 }
2150
2151 static void
2152 ixgb_vlan_strip_enable(struct ixgb_adapter *adapter)
2153 {
2154         u32 ctrl;
2155
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
2162 static void
2163 ixgb_vlan_strip_disable(struct ixgb_adapter *adapter)
2164 {
2165         u32 ctrl;
2166
2167         /* disable VLAN tag insert/strip */
2168         ctrl = IXGB_READ_REG(&adapter->hw, CTRL0);
2169         ctrl &= ~IXGB_CTRL0_VME;
2170         IXGB_WRITE_REG(&adapter->hw, CTRL0, ctrl);
2171 }
2172
2173 static void
2174 ixgb_vlan_rx_add_vid(struct net_device *netdev, u16 vid)
2175 {
2176         struct ixgb_adapter *adapter = netdev_priv(netdev);
2177         u32 vfta, index;
2178
2179         /* add VID to filter table */
2180
2181         index = (vid >> 5) & 0x7F;
2182         vfta = IXGB_READ_REG_ARRAY(&adapter->hw, VFTA, index);
2183         vfta |= (1 << (vid & 0x1F));
2184         ixgb_write_vfta(&adapter->hw, index, vfta);
2185         set_bit(vid, adapter->active_vlans);
2186 }
2187
2188 static void
2189 ixgb_vlan_rx_kill_vid(struct net_device *netdev, u16 vid)
2190 {
2191         struct ixgb_adapter *adapter = netdev_priv(netdev);
2192         u32 vfta, index;
2193
2194         /* remove VID from filter table */
2195
2196         index = (vid >> 5) & 0x7F;
2197         vfta = IXGB_READ_REG_ARRAY(&adapter->hw, VFTA, index);
2198         vfta &= ~(1 << (vid & 0x1F));
2199         ixgb_write_vfta(&adapter->hw, index, vfta);
2200         clear_bit(vid, adapter->active_vlans);
2201 }
2202
2203 static void
2204 ixgb_restore_vlan(struct ixgb_adapter *adapter)
2205 {
2206         u16 vid;
2207
2208         for_each_set_bit(vid, adapter->active_vlans, VLAN_N_VID)
2209                 ixgb_vlan_rx_add_vid(adapter->netdev, vid);
2210 }
2211
2212 #ifdef CONFIG_NET_POLL_CONTROLLER
2213 /*
2214  * Polling 'interrupt' - used by things like netconsole to send skbs
2215  * without having to re-enable interrupts. It's not called while
2216  * the interrupt routine is executing.
2217  */
2218
2219 static void ixgb_netpoll(struct net_device *dev)
2220 {
2221         struct ixgb_adapter *adapter = netdev_priv(dev);
2222
2223         disable_irq(adapter->pdev->irq);
2224         ixgb_intr(adapter->pdev->irq, dev);
2225         enable_irq(adapter->pdev->irq);
2226 }
2227 #endif
2228
2229 /**
2230  * ixgb_io_error_detected() - called when PCI error is detected
2231  * @pdev    pointer to pci device with error
2232  * @state   pci channel state after error
2233  *
2234  * This callback is called by the PCI subsystem whenever
2235  * a PCI bus error is detected.
2236  */
2237 static pci_ers_result_t ixgb_io_error_detected(struct pci_dev *pdev,
2238                                                enum pci_channel_state state)
2239 {
2240         struct net_device *netdev = pci_get_drvdata(pdev);
2241         struct ixgb_adapter *adapter = netdev_priv(netdev);
2242
2243         netif_device_detach(netdev);
2244
2245         if (state == pci_channel_io_perm_failure)
2246                 return PCI_ERS_RESULT_DISCONNECT;
2247
2248         if (netif_running(netdev))
2249                 ixgb_down(adapter, true);
2250
2251         pci_disable_device(pdev);
2252
2253         /* Request a slot reset. */
2254         return PCI_ERS_RESULT_NEED_RESET;
2255 }
2256
2257 /**
2258  * ixgb_io_slot_reset - called after the pci bus has been reset.
2259  * @pdev    pointer to pci device with error
2260  *
2261  * This callback is called after the PCI bus has been reset.
2262  * Basically, this tries to restart the card from scratch.
2263  * This is a shortened version of the device probe/discovery code,
2264  * it resembles the first-half of the ixgb_probe() routine.
2265  */
2266 static pci_ers_result_t ixgb_io_slot_reset(struct pci_dev *pdev)
2267 {
2268         struct net_device *netdev = pci_get_drvdata(pdev);
2269         struct ixgb_adapter *adapter = netdev_priv(netdev);
2270
2271         if (pci_enable_device(pdev)) {
2272                 netif_err(adapter, probe, adapter->netdev,
2273                           "Cannot re-enable PCI device after reset\n");
2274                 return PCI_ERS_RESULT_DISCONNECT;
2275         }
2276
2277         /* Perform card reset only on one instance of the card */
2278         if (0 != PCI_FUNC (pdev->devfn))
2279                 return PCI_ERS_RESULT_RECOVERED;
2280
2281         pci_set_master(pdev);
2282
2283         netif_carrier_off(netdev);
2284         netif_stop_queue(netdev);
2285         ixgb_reset(adapter);
2286
2287         /* Make sure the EEPROM is good */
2288         if (!ixgb_validate_eeprom_checksum(&adapter->hw)) {
2289                 netif_err(adapter, probe, adapter->netdev,
2290                           "After reset, the EEPROM checksum is not valid\n");
2291                 return PCI_ERS_RESULT_DISCONNECT;
2292         }
2293         ixgb_get_ee_mac_addr(&adapter->hw, netdev->dev_addr);
2294         memcpy(netdev->perm_addr, netdev->dev_addr, netdev->addr_len);
2295
2296         if (!is_valid_ether_addr(netdev->perm_addr)) {
2297                 netif_err(adapter, probe, adapter->netdev,
2298                           "After reset, invalid MAC address\n");
2299                 return PCI_ERS_RESULT_DISCONNECT;
2300         }
2301
2302         return PCI_ERS_RESULT_RECOVERED;
2303 }
2304
2305 /**
2306  * ixgb_io_resume - called when its OK to resume normal operations
2307  * @pdev    pointer to pci device with error
2308  *
2309  * The error recovery driver tells us that its OK to resume
2310  * normal operation. Implementation resembles the second-half
2311  * of the ixgb_probe() routine.
2312  */
2313 static void ixgb_io_resume(struct pci_dev *pdev)
2314 {
2315         struct net_device *netdev = pci_get_drvdata(pdev);
2316         struct ixgb_adapter *adapter = netdev_priv(netdev);
2317
2318         pci_set_master(pdev);
2319
2320         if (netif_running(netdev)) {
2321                 if (ixgb_up(adapter)) {
2322                         pr_err("can't bring device back up after reset\n");
2323                         return;
2324                 }
2325         }
2326
2327         netif_device_attach(netdev);
2328         mod_timer(&adapter->watchdog_timer, jiffies);
2329 }
2330
2331 /* ixgb_main.c */