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 <linux/prefetch.h>
  32 #include "ixgb.h"
  33
  34 char ixgb_driver_name[] = "ixgb";
  35 static char ixgb_driver_string[] = "Intel(R) PRO/10GbE Network Driver";
  36
  37 #define DRIVERNAPI "-NAPI"
  38 #define DRV_VERSION "1.0.135-k2" DRIVERNAPI
  39 const char ixgb_driver_version[] = DRV_VERSION;
  40 static const char ixgb_copyright[] = "Copyright (c) 1999-2008 Intel Corporation.";
  41
  42 #define IXGB_CB_LENGTH 256
  43 static unsigned int copybreak __read_mostly = IXGB_CB_LENGTH;
  44 module_param(copybreak, uint, 0644);
  45 MODULE_PARM_DESC(copybreak,
  46         "Maximum size of packet that is copied to a new buffer on receive");
  47
  48 /* ixgb_pci_tbl - PCI Device ID Table
  49  *
  50  * Wildcard entries (PCI_ANY_ID) should come last
  51  * Last entry must be all 0s
  52  *
  53  * { Vendor ID, Device ID, SubVendor ID, SubDevice ID,
  54  *   Class, Class Mask, private data (not used) }
  55  */
  56 static DEFINE_PCI_DEVICE_TABLE(ixgb_pci_tbl) = {
  57         {INTEL_VENDOR_ID, IXGB_DEVICE_ID_82597EX,
  58          PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
  59         {INTEL_VENDOR_ID, IXGB_DEVICE_ID_82597EX_CX4,
  60          PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
  61         {INTEL_VENDOR_ID, IXGB_DEVICE_ID_82597EX_SR,
  62          PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
  63         {INTEL_VENDOR_ID, IXGB_DEVICE_ID_82597EX_LR,
  64          PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
  65
  66         /* required last entry */
  67         {0,}
  68 };
  69
  70 MODULE_DEVICE_TABLE(pci, ixgb_pci_tbl);
  71
  72 /* Local Function Prototypes */
  73 static int ixgb_init_module(void);
  74 static void ixgb_exit_module(void);
  75 static int ixgb_probe(struct pci_dev *pdev, const struct pci_device_id *ent);
  76 static void __devexit ixgb_remove(struct pci_dev *pdev);
  77 static int ixgb_sw_init(struct ixgb_adapter *adapter);
  78 static int ixgb_open(struct net_device *netdev);
  79 static int ixgb_close(struct net_device *netdev);
  80 static void ixgb_configure_tx(struct ixgb_adapter *adapter);
  81 static void ixgb_configure_rx(struct ixgb_adapter *adapter);
  82 static void ixgb_setup_rctl(struct ixgb_adapter *adapter);
  83 static void ixgb_clean_tx_ring(struct ixgb_adapter *adapter);
  84 static void ixgb_clean_rx_ring(struct ixgb_adapter *adapter);
  85 static void ixgb_set_multi(struct net_device *netdev);
  86 static void ixgb_watchdog(unsigned long data);
  87 static netdev_tx_t ixgb_xmit_frame(struct sk_buff *skb,
  88                                    struct net_device *netdev);
  89 static struct net_device_stats *ixgb_get_stats(struct net_device *netdev);
  90 static int ixgb_change_mtu(struct net_device *netdev, int new_mtu);
  91 static int ixgb_set_mac(struct net_device *netdev, void *p);
  92 static irqreturn_t ixgb_intr(int irq, void *data);
  93 static bool ixgb_clean_tx_irq(struct ixgb_adapter *adapter);
  94
  95 static int ixgb_clean(struct napi_struct *, int);
  96 static bool ixgb_clean_rx_irq(struct ixgb_adapter *, int *, int);
  97 static void ixgb_alloc_rx_buffers(struct ixgb_adapter *, int);
  98
  99 static void ixgb_tx_timeout(struct net_device *dev);
 100 static void ixgb_tx_timeout_task(struct work_struct *work);
 101
 102 static void ixgb_vlan_strip_enable(struct ixgb_adapter *adapter);
 103 static void ixgb_vlan_strip_disable(struct ixgb_adapter *adapter);
 104 static void ixgb_vlan_rx_add_vid(struct net_device *netdev, u16 vid);
 105 static void ixgb_vlan_rx_kill_vid(struct net_device *netdev, u16 vid);
 106 static void ixgb_restore_vlan(struct ixgb_adapter *adapter);
 107
 108 #ifdef CONFIG_NET_POLL_CONTROLLER
 109 /* for netdump / net console */
 110 static void ixgb_netpoll(struct net_device *dev);
 111 #endif
 112
 113 static pci_ers_result_t ixgb_io_error_detected (struct pci_dev *pdev,
 114                              enum pci_channel_state state);
 115 static pci_ers_result_t ixgb_io_slot_reset (struct pci_dev *pdev);
 116 static void ixgb_io_resume (struct pci_dev *pdev);
 117
 118 static struct pci_error_handlers ixgb_err_handler = {
 119         .error_detected = ixgb_io_error_detected,
 120         .slot_reset = ixgb_io_slot_reset,
 121         .resume = ixgb_io_resume,
 122 };
 123
 124 static struct pci_driver ixgb_driver = {
 125         .name     = ixgb_driver_name,
 126         .id_table = ixgb_pci_tbl,
 127         .probe    = ixgb_probe,
 128         .remove   = __devexit_p(ixgb_remove),
 129         .err_handler = &ixgb_err_handler
 130 };
 131
 132 MODULE_AUTHOR("Intel Corporation, <linux.nics@intel.com>");
 133 MODULE_DESCRIPTION("Intel(R) PRO/10GbE Network Driver");
 134 MODULE_LICENSE("GPL");
 135 MODULE_VERSION(DRV_VERSION);
 136
 137 #define DEFAULT_DEBUG_LEVEL_SHIFT 3
 138 static int debug = DEFAULT_DEBUG_LEVEL_SHIFT;
 139 module_param(debug, int, 0);
 140 MODULE_PARM_DESC(debug, "Debug level (0=none,...,16=all)");
 141
 142 /**
 143  * ixgb_init_module - Driver Registration Routine
 144  *
 145  * ixgb_init_module is the first routine called when the driver is
 146  * loaded. All it does is register with the PCI subsystem.
 147  **/
 148
 149 static int __init
 150 ixgb_init_module(void)
 151 {
 152         pr_info("%s - version %s\n", ixgb_driver_string, ixgb_driver_version);
 153         pr_info("%s\n", ixgb_copyright);
 154
 155         return pci_register_driver(&ixgb_driver);
 156 }
 157
 158 module_init(ixgb_init_module);
 159
 160 /**
 161  * ixgb_exit_module - Driver Exit Cleanup Routine
 162  *
 163  * ixgb_exit_module is called just before the driver is removed
 164  * from memory.
 165  **/
 166
 167 static void __exit
 168 ixgb_exit_module(void)
 169 {
 170         pci_unregister_driver(&ixgb_driver);
 171 }
 172
 173 module_exit(ixgb_exit_module);
 174
 175 /**
 176  * ixgb_irq_disable - Mask off interrupt generation on the NIC
 177  * @adapter: board private structure
 178  **/
 179
 180 static void
 181 ixgb_irq_disable(struct ixgb_adapter *adapter)
 182 {
 183         IXGB_WRITE_REG(&adapter->hw, IMC, ~0);
 184         IXGB_WRITE_FLUSH(&adapter->hw);
 185         synchronize_irq(adapter->pdev->irq);
 186 }
 187
 188 /**
 189  * ixgb_irq_enable - Enable default interrupt generation settings
 190  * @adapter: board private structure
 191  **/
 192
 193 static void
 194 ixgb_irq_enable(struct ixgb_adapter *adapter)
 195 {
 196         u32 val = IXGB_INT_RXT0 | IXGB_INT_RXDMT0 |
 197                   IXGB_INT_TXDW | IXGB_INT_LSC;
 198         if (adapter->hw.subsystem_vendor_id == SUN_SUBVENDOR_ID)
 199                 val |= IXGB_INT_GPI0;
 200         IXGB_WRITE_REG(&adapter->hw, IMS, val);
 201         IXGB_WRITE_FLUSH(&adapter->hw);
 202 }
 203
 204 int
 205 ixgb_up(struct ixgb_adapter *adapter)
 206 {
 207         struct net_device *netdev = adapter->netdev;
 208         int err, irq_flags = IRQF_SHARED;
 209         int max_frame = netdev->mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;
 210         struct ixgb_hw *hw = &adapter->hw;
 211
 212         /* hardware has been reset, we need to reload some things */
 213
 214         ixgb_rar_set(hw, netdev->dev_addr, 0);
 215         ixgb_set_multi(netdev);
 216
 217         ixgb_restore_vlan(adapter);
 218
 219         ixgb_configure_tx(adapter);
 220         ixgb_setup_rctl(adapter);
 221         ixgb_configure_rx(adapter);
 222         ixgb_alloc_rx_buffers(adapter, IXGB_DESC_UNUSED(&adapter->rx_ring));
 223
 224         /* disable interrupts and get the hardware into a known state */
 225         IXGB_WRITE_REG(&adapter->hw, IMC, 0xffffffff);
 226
 227         /* only enable MSI if bus is in PCI-X mode */
 228         if (IXGB_READ_REG(&adapter->hw, STATUS) & IXGB_STATUS_PCIX_MODE) {
 229                 err = pci_enable_msi(adapter->pdev);
 230                 if (!err) {
 231                         adapter->have_msi = 1;
 232                         irq_flags = 0;
 233                 }
 234                 /* proceed to try to request regular interrupt */
 235         }
 236
 237         err = request_irq(adapter->pdev->irq, ixgb_intr, irq_flags,
 238                           netdev->name, netdev);
 239         if (err) {
 240                 if (adapter->have_msi)
 241                         pci_disable_msi(adapter->pdev);
 242                 netif_err(adapter, probe, adapter->netdev,
 243                           "Unable to allocate interrupt Error: %d\n", err);
 244                 return err;
 245         }
 246
 247         if ((hw->max_frame_size != max_frame) ||
 248                 (hw->max_frame_size !=
 249                 (IXGB_READ_REG(hw, MFS) >> IXGB_MFS_SHIFT))) {
 250
 251                 hw->max_frame_size = max_frame;
 252
 253                 IXGB_WRITE_REG(hw, MFS, hw->max_frame_size << IXGB_MFS_SHIFT);
 254
 255                 if (hw->max_frame_size >
 256                    IXGB_MAX_ENET_FRAME_SIZE_WITHOUT_FCS + ENET_FCS_LENGTH) {
 257                         u32 ctrl0 = IXGB_READ_REG(hw, CTRL0);
 258
 259                         if (!(ctrl0 & IXGB_CTRL0_JFE)) {
 260                                 ctrl0 |= IXGB_CTRL0_JFE;
 261                                 IXGB_WRITE_REG(hw, CTRL0, ctrl0);
 262                         }
 263                 }
 264         }
 265
 266         clear_bit(__IXGB_DOWN, &adapter->flags);
 267
 268         napi_enable(&adapter->napi);
 269         ixgb_irq_enable(adapter);
 270
 271         netif_wake_queue(netdev);
 272
 273         mod_timer(&adapter->watchdog_timer, jiffies);
 274
 275         return 0;
 276 }
 277
 278 void
 279 ixgb_down(struct ixgb_adapter *adapter, bool kill_watchdog)
 280 {
 281         struct net_device *netdev = adapter->netdev;
 282
 283         /* prevent the interrupt handler from restarting watchdog */
 284         set_bit(__IXGB_DOWN, &adapter->flags);
 285
 286         napi_disable(&adapter->napi);
 287         /* waiting for NAPI to complete can re-enable interrupts */
 288         ixgb_irq_disable(adapter);
 289         free_irq(adapter->pdev->irq, netdev);
 290
 291         if (adapter->have_msi)
 292                 pci_disable_msi(adapter->pdev);
 293
 294         if (kill_watchdog)
 295                 del_timer_sync(&adapter->watchdog_timer);
 296
 297         adapter->link_speed = 0;
 298         adapter->link_duplex = 0;
 299         netif_carrier_off(netdev);
 300         netif_stop_queue(netdev);
 301
 302         ixgb_reset(adapter);
 303         ixgb_clean_tx_ring(adapter);
 304         ixgb_clean_rx_ring(adapter);
 305 }
 306
 307 void
 308 ixgb_reset(struct ixgb_adapter *adapter)
 309 {
 310         struct ixgb_hw *hw = &adapter->hw;
 311
 312         ixgb_adapter_stop(hw);
 313         if (!ixgb_init_hw(hw))
 314                 netif_err(adapter, probe, adapter->netdev, "ixgb_init_hw failed\n");
 315
 316         /* restore frame size information */
 317         IXGB_WRITE_REG(hw, MFS, hw->max_frame_size << IXGB_MFS_SHIFT);
 318         if (hw->max_frame_size >
 319             IXGB_MAX_ENET_FRAME_SIZE_WITHOUT_FCS + ENET_FCS_LENGTH) {
 320                 u32 ctrl0 = IXGB_READ_REG(hw, CTRL0);
 321                 if (!(ctrl0 & IXGB_CTRL0_JFE)) {
 322                         ctrl0 |= IXGB_CTRL0_JFE;
 323                         IXGB_WRITE_REG(hw, CTRL0, ctrl0);
 324                 }
 325         }
 326 }
 327
 328 static const struct net_device_ops ixgb_netdev_ops = {
 329         .ndo_open               = ixgb_open,
 330         .ndo_stop               = ixgb_close,
 331         .ndo_start_xmit         = ixgb_xmit_frame,
 332         .ndo_get_stats          = ixgb_get_stats,
 333         .ndo_set_multicast_list = ixgb_set_multi,
 334         .ndo_validate_addr      = eth_validate_addr,
 335         .ndo_set_mac_address    = ixgb_set_mac,
 336         .ndo_change_mtu         = ixgb_change_mtu,
 337         .ndo_tx_timeout         = ixgb_tx_timeout,
 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                 netdev->vlan_features |= NETIF_F_HIGHDMA;
 452         }
 453
 454         /* make sure the EEPROM is good */
 455
 456         if (!ixgb_validate_eeprom_checksum(&adapter->hw)) {
 457                 netif_err(adapter, probe, adapter->netdev,
 458                           "The EEPROM Checksum Is Not Valid\n");
 459                 err = -EIO;
 460                 goto err_eeprom;
 461         }
 462
 463         ixgb_get_ee_mac_addr(&adapter->hw, netdev->dev_addr);
 464         memcpy(netdev->perm_addr, netdev->dev_addr, netdev->addr_len);
 465
 466         if (!is_valid_ether_addr(netdev->perm_addr)) {
 467                 netif_err(adapter, probe, adapter->netdev, "Invalid MAC Address\n");
 468                 err = -EIO;
 469                 goto err_eeprom;
 470         }
 471
 472         adapter->part_num = ixgb_get_ee_pba_number(&adapter->hw);
 473
 474         init_timer(&adapter->watchdog_timer);
 475         adapter->watchdog_timer.function = ixgb_watchdog;
 476         adapter->watchdog_timer.data = (unsigned long)adapter;
 477
 478         INIT_WORK(&adapter->tx_timeout_task, ixgb_tx_timeout_task);
 479
 480         strcpy(netdev->name, "eth%d");
 481         err = register_netdev(netdev);
 482         if (err)
 483                 goto err_register;
 484
 485         /* carrier off reporting is important to ethtool even BEFORE open */
 486         netif_carrier_off(netdev);
 487
 488         netif_info(adapter, probe, adapter->netdev,
 489                    "Intel(R) PRO/10GbE Network Connection\n");
 490         ixgb_check_options(adapter);
 491         /* reset the hardware with the new settings */
 492
 493         ixgb_reset(adapter);
 494
 495         cards_found++;
 496         return 0;
 497
 498 err_register:
 499 err_sw_init:
 500 err_eeprom:
 501         iounmap(adapter->hw.hw_addr);
 502 err_ioremap:
 503         free_netdev(netdev);
 504 err_alloc_etherdev:
 505         pci_release_regions(pdev);
 506 err_request_regions:
 507 err_dma_mask:
 508         pci_disable_device(pdev);
 509         return err;
 510 }
 511
 512 /**
 513  * ixgb_remove - Device Removal Routine
 514  * @pdev: PCI device information struct
 515  *
 516  * ixgb_remove is called by the PCI subsystem to alert the driver
 517  * that it should release a PCI device.  The could be caused by a
 518  * Hot-Plug event, or because the driver is going to be removed from
 519  * memory.
 520  **/
 521
 522 static void __devexit
 523 ixgb_remove(struct pci_dev *pdev)
 524 {
 525         struct net_device *netdev = pci_get_drvdata(pdev);
 526         struct ixgb_adapter *adapter = netdev_priv(netdev);
 527
 528         cancel_work_sync(&adapter->tx_timeout_task);
 529
 530         unregister_netdev(netdev);
 531
 532         iounmap(adapter->hw.hw_addr);
 533         pci_release_regions(pdev);
 534
 535         free_netdev(netdev);
 536         pci_disable_device(pdev);
 537 }
 538
 539 /**
 540  * ixgb_sw_init - Initialize general software structures (struct ixgb_adapter)
 541  * @adapter: board private structure to initialize
 542  *
 543  * ixgb_sw_init initializes the Adapter private data structure.
 544  * Fields are initialized based on PCI device information and
 545  * OS network device settings (MTU size).
 546  **/
 547
 548 static int __devinit
 549 ixgb_sw_init(struct ixgb_adapter *adapter)
 550 {
 551         struct ixgb_hw *hw = &adapter->hw;
 552         struct net_device *netdev = adapter->netdev;
 553         struct pci_dev *pdev = adapter->pdev;
 554
 555         /* PCI config space info */
 556
 557         hw->vendor_id = pdev->vendor;
 558         hw->device_id = pdev->device;
 559         hw->subsystem_vendor_id = pdev->subsystem_vendor;
 560         hw->subsystem_id = pdev->subsystem_device;
 561
 562         hw->max_frame_size = netdev->mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;
 563         adapter->rx_buffer_len = hw->max_frame_size + 8; /* + 8 for errata */
 564
 565         if ((hw->device_id == IXGB_DEVICE_ID_82597EX) ||
 566             (hw->device_id == IXGB_DEVICE_ID_82597EX_CX4) ||
 567             (hw->device_id == IXGB_DEVICE_ID_82597EX_LR) ||
 568             (hw->device_id == IXGB_DEVICE_ID_82597EX_SR))
 569                 hw->mac_type = ixgb_82597;
 570         else {
 571                 /* should never have loaded on this device */
 572                 netif_err(adapter, probe, adapter->netdev, "unsupported device id\n");
 573         }
 574
 575         /* enable flow control to be programmed */
 576         hw->fc.send_xon = 1;
 577
 578         set_bit(__IXGB_DOWN, &adapter->flags);
 579         return 0;
 580 }
 581
 582 /**
 583  * ixgb_open - Called when a network interface is made active
 584  * @netdev: network interface device structure
 585  *
 586  * Returns 0 on success, negative value on failure
 587  *
 588  * The open entry point is called when a network interface is made
 589  * active by the system (IFF_UP).  At this point all resources needed
 590  * for transmit and receive operations are allocated, the interrupt
 591  * handler is registered with the OS, the watchdog timer is started,
 592  * and the stack is notified that the interface is ready.
 593  **/
 594
 595 static int
 596 ixgb_open(struct net_device *netdev)
 597 {
 598         struct ixgb_adapter *adapter = netdev_priv(netdev);
 599         int err;
 600
 601         /* allocate transmit descriptors */
 602         err = ixgb_setup_tx_resources(adapter);
 603         if (err)
 604                 goto err_setup_tx;
 605
 606         netif_carrier_off(netdev);
 607
 608         /* allocate receive descriptors */
 609
 610         err = ixgb_setup_rx_resources(adapter);
 611         if (err)
 612                 goto err_setup_rx;
 613
 614         err = ixgb_up(adapter);
 615         if (err)
 616                 goto err_up;
 617
 618         netif_start_queue(netdev);
 619
 620         return 0;
 621
 622 err_up:
 623         ixgb_free_rx_resources(adapter);
 624 err_setup_rx:
 625         ixgb_free_tx_resources(adapter);
 626 err_setup_tx:
 627         ixgb_reset(adapter);
 628
 629         return err;
 630 }
 631
 632 /**
 633  * ixgb_close - Disables a network interface
 634  * @netdev: network interface device structure
 635  *
 636  * Returns 0, this is not allowed to fail
 637  *
 638  * The close entry point is called when an interface is de-activated
 639  * by the OS.  The hardware is still under the drivers control, but
 640  * needs to be disabled.  A global MAC reset is issued to stop the
 641  * hardware, and all transmit and receive resources are freed.
 642  **/
 643
 644 static int
 645 ixgb_close(struct net_device *netdev)
 646 {
 647         struct ixgb_adapter *adapter = netdev_priv(netdev);
 648
 649         ixgb_down(adapter, true);
 650
 651         ixgb_free_tx_resources(adapter);
 652         ixgb_free_rx_resources(adapter);
 653
 654         return 0;
 655 }
 656
 657 /**
 658  * ixgb_setup_tx_resources - allocate Tx resources (Descriptors)
 659  * @adapter: board private structure
 660  *
 661  * Return 0 on success, negative on failure
 662  **/
 663
 664 int
 665 ixgb_setup_tx_resources(struct ixgb_adapter *adapter)
 666 {
 667         struct ixgb_desc_ring *txdr = &adapter->tx_ring;
 668         struct pci_dev *pdev = adapter->pdev;
 669         int size;
 670
 671         size = sizeof(struct ixgb_buffer) * txdr->count;
 672         txdr->buffer_info = vzalloc(size);
 673         if (!txdr->buffer_info) {
 674                 netif_err(adapter, probe, adapter->netdev,
 675                           "Unable to allocate transmit descriptor ring memory\n");
 676                 return -ENOMEM;
 677         }
 678
 679         /* round up to nearest 4K */
 680
 681         txdr->size = txdr->count * sizeof(struct ixgb_tx_desc);
 682         txdr->size = ALIGN(txdr->size, 4096);
 683
 684         txdr->desc = dma_alloc_coherent(&pdev->dev, txdr->size, &txdr->dma,
 685                                         GFP_KERNEL);
 686         if (!txdr->desc) {
 687                 vfree(txdr->buffer_info);
 688                 netif_err(adapter, probe, adapter->netdev,
 689                           "Unable to allocate transmit descriptor memory\n");
 690                 return -ENOMEM;
 691         }
 692         memset(txdr->desc, 0, txdr->size);
 693
 694         txdr->next_to_use = 0;
 695         txdr->next_to_clean = 0;
 696
 697         return 0;
 698 }
 699
 700 /**
 701  * ixgb_configure_tx - Configure 82597 Transmit Unit after Reset.
 702  * @adapter: board private structure
 703  *
 704  * Configure the Tx unit of the MAC after a reset.
 705  **/
 706
 707 static void
 708 ixgb_configure_tx(struct ixgb_adapter *adapter)
 709 {
 710         u64 tdba = adapter->tx_ring.dma;
 711         u32 tdlen = adapter->tx_ring.count * sizeof(struct ixgb_tx_desc);
 712         u32 tctl;
 713         struct ixgb_hw *hw = &adapter->hw;
 714
 715         /* Setup the Base and Length of the Tx Descriptor Ring
 716          * tx_ring.dma can be either a 32 or 64 bit value
 717          */
 718
 719         IXGB_WRITE_REG(hw, TDBAL, (tdba & 0x00000000ffffffffULL));
 720         IXGB_WRITE_REG(hw, TDBAH, (tdba >> 32));
 721
 722         IXGB_WRITE_REG(hw, TDLEN, tdlen);
 723
 724         /* Setup the HW Tx Head and Tail descriptor pointers */
 725
 726         IXGB_WRITE_REG(hw, TDH, 0);
 727         IXGB_WRITE_REG(hw, TDT, 0);
 728
 729         /* don't set up txdctl, it induces performance problems if configured
 730          * incorrectly */
 731         /* Set the Tx Interrupt Delay register */
 732
 733         IXGB_WRITE_REG(hw, TIDV, adapter->tx_int_delay);
 734
 735         /* Program the Transmit Control Register */
 736
 737         tctl = IXGB_TCTL_TCE | IXGB_TCTL_TXEN | IXGB_TCTL_TPDE;
 738         IXGB_WRITE_REG(hw, TCTL, tctl);
 739
 740         /* Setup Transmit Descriptor Settings for this adapter */
 741         adapter->tx_cmd_type =
 742                 IXGB_TX_DESC_TYPE |
 743                 (adapter->tx_int_delay_enable ? IXGB_TX_DESC_CMD_IDE : 0);
 744 }
 745
 746 /**
 747  * ixgb_setup_rx_resources - allocate Rx resources (Descriptors)
 748  * @adapter: board private structure
 749  *
 750  * Returns 0 on success, negative on failure
 751  **/
 752
 753 int
 754 ixgb_setup_rx_resources(struct ixgb_adapter *adapter)
 755 {
 756         struct ixgb_desc_ring *rxdr = &adapter->rx_ring;
 757         struct pci_dev *pdev = adapter->pdev;
 758         int size;
 759
 760         size = sizeof(struct ixgb_buffer) * rxdr->count;
 761         rxdr->buffer_info = vzalloc(size);
 762         if (!rxdr->buffer_info) {
 763                 netif_err(adapter, probe, adapter->netdev,
 764                           "Unable to allocate receive descriptor ring\n");
 765                 return -ENOMEM;
 766         }
 767
 768         /* Round up to nearest 4K */
 769
 770         rxdr->size = rxdr->count * sizeof(struct ixgb_rx_desc);
 771         rxdr->size = ALIGN(rxdr->size, 4096);
 772
 773         rxdr->desc = dma_alloc_coherent(&pdev->dev, rxdr->size, &rxdr->dma,
 774                                         GFP_KERNEL);
 775
 776         if (!rxdr->desc) {
 777                 vfree(rxdr->buffer_info);
 778                 netif_err(adapter, probe, adapter->netdev,
 779                           "Unable to allocate receive descriptors\n");
 780                 return -ENOMEM;
 781         }
 782         memset(rxdr->desc, 0, rxdr->size);
 783
 784         rxdr->next_to_clean = 0;
 785         rxdr->next_to_use = 0;
 786
 787         return 0;
 788 }
 789
 790 /**
 791  * ixgb_setup_rctl - configure the receive control register
 792  * @adapter: Board private structure
 793  **/
 794
 795 static void
 796 ixgb_setup_rctl(struct ixgb_adapter *adapter)
 797 {
 798         u32 rctl;
 799
 800         rctl = IXGB_READ_REG(&adapter->hw, RCTL);
 801
 802         rctl &= ~(3 << IXGB_RCTL_MO_SHIFT);
 803
 804         rctl |=
 805                 IXGB_RCTL_BAM | IXGB_RCTL_RDMTS_1_2 |
 806                 IXGB_RCTL_RXEN | IXGB_RCTL_CFF |
 807                 (adapter->hw.mc_filter_type << IXGB_RCTL_MO_SHIFT);
 808
 809         rctl |= IXGB_RCTL_SECRC;
 810
 811         if (adapter->rx_buffer_len <= IXGB_RXBUFFER_2048)
 812                 rctl |= IXGB_RCTL_BSIZE_2048;
 813         else if (adapter->rx_buffer_len <= IXGB_RXBUFFER_4096)
 814                 rctl |= IXGB_RCTL_BSIZE_4096;
 815         else if (adapter->rx_buffer_len <= IXGB_RXBUFFER_8192)
 816                 rctl |= IXGB_RCTL_BSIZE_8192;
 817         else if (adapter->rx_buffer_len <= IXGB_RXBUFFER_16384)
 818                 rctl |= IXGB_RCTL_BSIZE_16384;
 819
 820         IXGB_WRITE_REG(&adapter->hw, RCTL, rctl);
 821 }
 822
 823 /**
 824  * ixgb_configure_rx - Configure 82597 Receive Unit after Reset.
 825  * @adapter: board private structure
 826  *
 827  * Configure the Rx unit of the MAC after a reset.
 828  **/
 829
 830 static void
 831 ixgb_configure_rx(struct ixgb_adapter *adapter)
 832 {
 833         u64 rdba = adapter->rx_ring.dma;
 834         u32 rdlen = adapter->rx_ring.count * sizeof(struct ixgb_rx_desc);
 835         struct ixgb_hw *hw = &adapter->hw;
 836         u32 rctl;
 837         u32 rxcsum;
 838
 839         /* make sure receives are disabled while setting up the descriptors */
 840
 841         rctl = IXGB_READ_REG(hw, RCTL);
 842         IXGB_WRITE_REG(hw, RCTL, rctl & ~IXGB_RCTL_RXEN);
 843
 844         /* set the Receive Delay Timer Register */
 845
 846         IXGB_WRITE_REG(hw, RDTR, adapter->rx_int_delay);
 847
 848         /* Setup the Base and Length of the Rx Descriptor Ring */
 849
 850         IXGB_WRITE_REG(hw, RDBAL, (rdba & 0x00000000ffffffffULL));
 851         IXGB_WRITE_REG(hw, RDBAH, (rdba >> 32));
 852
 853         IXGB_WRITE_REG(hw, RDLEN, rdlen);
 854
 855         /* Setup the HW Rx Head and Tail Descriptor Pointers */
 856         IXGB_WRITE_REG(hw, RDH, 0);
 857         IXGB_WRITE_REG(hw, RDT, 0);
 858
 859         /* due to the hardware errata with RXDCTL, we are unable to use any of
 860          * the performance enhancing features of it without causing other
 861          * subtle bugs, some of the bugs could include receive length
 862          * corruption at high data rates (WTHRESH > 0) and/or receive
 863          * descriptor ring irregularites (particularly in hardware cache) */
 864         IXGB_WRITE_REG(hw, RXDCTL, 0);
 865
 866         /* Enable Receive Checksum Offload for TCP and UDP */
 867         if (adapter->rx_csum) {
 868                 rxcsum = IXGB_READ_REG(hw, RXCSUM);
 869                 rxcsum |= IXGB_RXCSUM_TUOFL;
 870                 IXGB_WRITE_REG(hw, RXCSUM, rxcsum);
 871         }
 872
 873         /* Enable Receives */
 874
 875         IXGB_WRITE_REG(hw, RCTL, rctl);
 876 }
 877
 878 /**
 879  * ixgb_free_tx_resources - Free Tx Resources
 880  * @adapter: board private structure
 881  *
 882  * Free all transmit software resources
 883  **/
 884
 885 void
 886 ixgb_free_tx_resources(struct ixgb_adapter *adapter)
 887 {
 888         struct pci_dev *pdev = adapter->pdev;
 889
 890         ixgb_clean_tx_ring(adapter);
 891
 892         vfree(adapter->tx_ring.buffer_info);
 893         adapter->tx_ring.buffer_info = NULL;
 894
 895         dma_free_coherent(&pdev->dev, adapter->tx_ring.size,
 896                           adapter->tx_ring.desc, adapter->tx_ring.dma);
 897
 898         adapter->tx_ring.desc = NULL;
 899 }
 900
 901 static void
 902 ixgb_unmap_and_free_tx_resource(struct ixgb_adapter *adapter,
 903                                 struct ixgb_buffer *buffer_info)
 904 {
 905         if (buffer_info->dma) {
 906                 if (buffer_info->mapped_as_page)
 907                         dma_unmap_page(&adapter->pdev->dev, buffer_info->dma,
 908                                        buffer_info->length, DMA_TO_DEVICE);
 909                 else
 910                         dma_unmap_single(&adapter->pdev->dev, buffer_info->dma,
 911                                          buffer_info->length, DMA_TO_DEVICE);
 912                 buffer_info->dma = 0;
 913         }
 914
 915         if (buffer_info->skb) {
 916                 dev_kfree_skb_any(buffer_info->skb);
 917                 buffer_info->skb = NULL;
 918         }
 919         buffer_info->time_stamp = 0;
 920         /* these fields must always be initialized in tx
 921          * buffer_info->length = 0;
 922          * buffer_info->next_to_watch = 0; */
 923 }
 924
 925 /**
 926  * ixgb_clean_tx_ring - Free Tx Buffers
 927  * @adapter: board private structure
 928  **/
 929
 930 static void
 931 ixgb_clean_tx_ring(struct ixgb_adapter *adapter)
 932 {
 933         struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
 934         struct ixgb_buffer *buffer_info;
 935         unsigned long size;
 936         unsigned int i;
 937
 938         /* Free all the Tx ring sk_buffs */
 939
 940         for (i = 0; i < tx_ring->count; i++) {
 941                 buffer_info = &tx_ring->buffer_info[i];
 942                 ixgb_unmap_and_free_tx_resource(adapter, buffer_info);
 943         }
 944
 945         size = sizeof(struct ixgb_buffer) * tx_ring->count;
 946         memset(tx_ring->buffer_info, 0, size);
 947
 948         /* Zero out the descriptor ring */
 949
 950         memset(tx_ring->desc, 0, tx_ring->size);
 951
 952         tx_ring->next_to_use = 0;
 953         tx_ring->next_to_clean = 0;
 954
 955         IXGB_WRITE_REG(&adapter->hw, TDH, 0);
 956         IXGB_WRITE_REG(&adapter->hw, TDT, 0);
 957 }
 958
 959 /**
 960  * ixgb_free_rx_resources - Free Rx Resources
 961  * @adapter: board private structure
 962  *
 963  * Free all receive software resources
 964  **/
 965
 966 void
 967 ixgb_free_rx_resources(struct ixgb_adapter *adapter)
 968 {
 969         struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
 970         struct pci_dev *pdev = adapter->pdev;
 971
 972         ixgb_clean_rx_ring(adapter);
 973
 974         vfree(rx_ring->buffer_info);
 975         rx_ring->buffer_info = NULL;
 976
 977         dma_free_coherent(&pdev->dev, rx_ring->size, rx_ring->desc,
 978                           rx_ring->dma);
 979
 980         rx_ring->desc = NULL;
 981 }
 982
 983 /**
 984  * ixgb_clean_rx_ring - Free Rx Buffers
 985  * @adapter: board private structure
 986  **/
 987
 988 static void
 989 ixgb_clean_rx_ring(struct ixgb_adapter *adapter)
 990 {
 991         struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
 992         struct ixgb_buffer *buffer_info;
 993         struct pci_dev *pdev = adapter->pdev;
 994         unsigned long size;
 995         unsigned int i;
 996
 997         /* Free all the Rx ring sk_buffs */
 998
 999         for (i = 0; i < rx_ring->count; i++) {
1000                 buffer_info = &rx_ring->buffer_info[i];
1001                 if (buffer_info->dma) {
1002                         dma_unmap_single(&pdev->dev,
1003                                          buffer_info->dma,
1004                                          buffer_info->length,
1005                                          DMA_FROM_DEVICE);
1006                         buffer_info->dma = 0;
1007                         buffer_info->length = 0;
1008                 }
1009
1010                 if (buffer_info->skb) {
1011                         dev_kfree_skb(buffer_info->skb);
1012                         buffer_info->skb = NULL;
1013                 }
1014         }
1015
1016         size = sizeof(struct ixgb_buffer) * rx_ring->count;
1017         memset(rx_ring->buffer_info, 0, size);
1018
1019         /* Zero out the descriptor ring */
1020
1021         memset(rx_ring->desc, 0, rx_ring->size);
1022
1023         rx_ring->next_to_clean = 0;
1024         rx_ring->next_to_use = 0;
1025
1026         IXGB_WRITE_REG(&adapter->hw, RDH, 0);
1027         IXGB_WRITE_REG(&adapter->hw, RDT, 0);
1028 }
1029
1030 /**
1031  * ixgb_set_mac - Change the Ethernet Address of the NIC
1032  * @netdev: network interface device structure
1033  * @p: pointer to an address structure
1034  *
1035  * Returns 0 on success, negative on failure
1036  **/
1037
1038 static int
1039 ixgb_set_mac(struct net_device *netdev, void *p)
1040 {
1041         struct ixgb_adapter *adapter = netdev_priv(netdev);
1042         struct sockaddr *addr = p;
1043
1044         if (!is_valid_ether_addr(addr->sa_data))
1045                 return -EADDRNOTAVAIL;
1046
1047         memcpy(netdev->dev_addr, addr->sa_data, netdev->addr_len);
1048
1049         ixgb_rar_set(&adapter->hw, addr->sa_data, 0);
1050
1051         return 0;
1052 }
1053
1054 /**
1055  * ixgb_set_multi - Multicast and Promiscuous mode set
1056  * @netdev: network interface device structure
1057  *
1058  * The set_multi entry point is called whenever the multicast address
1059  * list or the network interface flags are updated.  This routine is
1060  * responsible for configuring the hardware for proper multicast,
1061  * promiscuous mode, and all-multi behavior.
1062  **/
1063
1064 static void
1065 ixgb_set_multi(struct net_device *netdev)
1066 {
1067         struct ixgb_adapter *adapter = netdev_priv(netdev);
1068         struct ixgb_hw *hw = &adapter->hw;
1069         struct netdev_hw_addr *ha;
1070         u32 rctl;
1071         int i;
1072
1073         /* Check for Promiscuous and All Multicast modes */
1074
1075         rctl = IXGB_READ_REG(hw, RCTL);
1076
1077         if (netdev->flags & IFF_PROMISC) {
1078                 rctl |= (IXGB_RCTL_UPE | IXGB_RCTL_MPE);
1079                 /* disable VLAN filtering */
1080                 rctl &= ~IXGB_RCTL_CFIEN;
1081                 rctl &= ~IXGB_RCTL_VFE;
1082         } else {
1083                 if (netdev->flags & IFF_ALLMULTI) {
1084                         rctl |= IXGB_RCTL_MPE;
1085                         rctl &= ~IXGB_RCTL_UPE;
1086                 } else {
1087                         rctl &= ~(IXGB_RCTL_UPE | IXGB_RCTL_MPE);
1088                 }
1089                 /* enable VLAN filtering */
1090                 rctl |= IXGB_RCTL_VFE;
1091                 rctl &= ~IXGB_RCTL_CFIEN;
1092         }
1093
1094         if (netdev_mc_count(netdev) > IXGB_MAX_NUM_MULTICAST_ADDRESSES) {
1095                 rctl |= IXGB_RCTL_MPE;
1096                 IXGB_WRITE_REG(hw, RCTL, rctl);
1097         } else {
1098                 u8 mta[IXGB_MAX_NUM_MULTICAST_ADDRESSES *
1099                             IXGB_ETH_LENGTH_OF_ADDRESS];
1100
1101                 IXGB_WRITE_REG(hw, RCTL, rctl);
1102
1103                 i = 0;
1104                 netdev_for_each_mc_addr(ha, netdev)
1105                         memcpy(&mta[i++ * IXGB_ETH_LENGTH_OF_ADDRESS],
1106                                ha->addr, IXGB_ETH_LENGTH_OF_ADDRESS);
1107
1108                 ixgb_mc_addr_list_update(hw, mta, netdev_mc_count(netdev), 0);
1109         }
1110
1111         if (netdev->features & NETIF_F_HW_VLAN_RX)
1112                 ixgb_vlan_strip_enable(adapter);
1113         else
1114                 ixgb_vlan_strip_disable(adapter);
1115
1116 }
1117
1118 /**
1119  * ixgb_watchdog - Timer Call-back
1120  * @data: pointer to netdev cast into an unsigned long
1121  **/
1122
1123 static void
1124 ixgb_watchdog(unsigned long data)
1125 {
1126         struct ixgb_adapter *adapter = (struct ixgb_adapter *)data;
1127         struct net_device *netdev = adapter->netdev;
1128         struct ixgb_desc_ring *txdr = &adapter->tx_ring;
1129
1130         ixgb_check_for_link(&adapter->hw);
1131
1132         if (ixgb_check_for_bad_link(&adapter->hw)) {
1133                 /* force the reset path */
1134                 netif_stop_queue(netdev);
1135         }
1136
1137         if (adapter->hw.link_up) {
1138                 if (!netif_carrier_ok(netdev)) {
1139                         netdev_info(netdev,
1140                                     "NIC Link is Up 10 Gbps Full Duplex, Flow Control: %s\n",
1141                                     (adapter->hw.fc.type == ixgb_fc_full) ?
1142                                     "RX/TX" :
1143                                     (adapter->hw.fc.type == ixgb_fc_rx_pause) ?
1144                                      "RX" :
1145                                     (adapter->hw.fc.type == ixgb_fc_tx_pause) ?
1146                                     "TX" : "None");
1147                         adapter->link_speed = 10000;
1148                         adapter->link_duplex = FULL_DUPLEX;
1149                         netif_carrier_on(netdev);
1150                 }
1151         } else {
1152                 if (netif_carrier_ok(netdev)) {
1153                         adapter->link_speed = 0;
1154                         adapter->link_duplex = 0;
1155                         netdev_info(netdev, "NIC Link is Down\n");
1156                         netif_carrier_off(netdev);
1157                 }
1158         }
1159
1160         ixgb_update_stats(adapter);
1161
1162         if (!netif_carrier_ok(netdev)) {
1163                 if (IXGB_DESC_UNUSED(txdr) + 1 < txdr->count) {
1164                         /* We've lost link, so the controller stops DMA,
1165                          * but we've got queued Tx work that's never going
1166                          * to get done, so reset controller to flush Tx.
1167                          * (Do the reset outside of interrupt context). */
1168                         schedule_work(&adapter->tx_timeout_task);
1169                         /* return immediately since reset is imminent */
1170                         return;
1171                 }
1172         }
1173
1174         /* Force detection of hung controller every watchdog period */
1175         adapter->detect_tx_hung = true;
1176
1177         /* generate an interrupt to force clean up of any stragglers */
1178         IXGB_WRITE_REG(&adapter->hw, ICS, IXGB_INT_TXDW);
1179
1180         /* Reset the timer */
1181         mod_timer(&adapter->watchdog_timer, jiffies + 2 * HZ);
1182 }
1183
1184 #define IXGB_TX_FLAGS_CSUM              0x00000001
1185 #define IXGB_TX_FLAGS_VLAN              0x00000002
1186 #define IXGB_TX_FLAGS_TSO               0x00000004
1187
1188 static int
1189 ixgb_tso(struct ixgb_adapter *adapter, struct sk_buff *skb)
1190 {
1191         struct ixgb_context_desc *context_desc;
1192         unsigned int i;
1193         u8 ipcss, ipcso, tucss, tucso, hdr_len;
1194         u16 ipcse, tucse, mss;
1195         int err;
1196
1197         if (likely(skb_is_gso(skb))) {
1198                 struct ixgb_buffer *buffer_info;
1199                 struct iphdr *iph;
1200
1201                 if (skb_header_cloned(skb)) {
1202                         err = pskb_expand_head(skb, 0, 0, GFP_ATOMIC);
1203                         if (err)
1204                                 return err;
1205                 }
1206
1207                 hdr_len = skb_transport_offset(skb) + tcp_hdrlen(skb);
1208                 mss = skb_shinfo(skb)->gso_size;
1209                 iph = ip_hdr(skb);
1210                 iph->tot_len = 0;
1211                 iph->check = 0;
1212                 tcp_hdr(skb)->check = ~csum_tcpudp_magic(iph->saddr,
1213                                                          iph->daddr, 0,
1214                                                          IPPROTO_TCP, 0);
1215                 ipcss = skb_network_offset(skb);
1216                 ipcso = (void *)&(iph->check) - (void *)skb->data;
1217                 ipcse = skb_transport_offset(skb) - 1;
1218                 tucss = skb_transport_offset(skb);
1219                 tucso = (void *)&(tcp_hdr(skb)->check) - (void *)skb->data;
1220                 tucse = 0;
1221
1222                 i = adapter->tx_ring.next_to_use;
1223                 context_desc = IXGB_CONTEXT_DESC(adapter->tx_ring, i);
1224                 buffer_info = &adapter->tx_ring.buffer_info[i];
1225                 WARN_ON(buffer_info->dma != 0);
1226
1227                 context_desc->ipcss = ipcss;
1228                 context_desc->ipcso = ipcso;
1229                 context_desc->ipcse = cpu_to_le16(ipcse);
1230                 context_desc->tucss = tucss;
1231                 context_desc->tucso = tucso;
1232                 context_desc->tucse = cpu_to_le16(tucse);
1233                 context_desc->mss = cpu_to_le16(mss);
1234                 context_desc->hdr_len = hdr_len;
1235                 context_desc->status = 0;
1236                 context_desc->cmd_type_len = cpu_to_le32(
1237                                                   IXGB_CONTEXT_DESC_TYPE
1238                                                 | IXGB_CONTEXT_DESC_CMD_TSE
1239                                                 | IXGB_CONTEXT_DESC_CMD_IP
1240                                                 | IXGB_CONTEXT_DESC_CMD_TCP
1241                                                 | IXGB_CONTEXT_DESC_CMD_IDE
1242                                                 | (skb->len - (hdr_len)));
1243
1244
1245                 if (++i == adapter->tx_ring.count) i = 0;
1246                 adapter->tx_ring.next_to_use = i;
1247
1248                 return 1;
1249         }
1250
1251         return 0;
1252 }
1253
1254 static bool
1255 ixgb_tx_csum(struct ixgb_adapter *adapter, struct sk_buff *skb)
1256 {
1257         struct ixgb_context_desc *context_desc;
1258         unsigned int i;
1259         u8 css, cso;
1260
1261         if (likely(skb->ip_summed == CHECKSUM_PARTIAL)) {
1262                 struct ixgb_buffer *buffer_info;
1263                 css = skb_checksum_start_offset(skb);
1264                 cso = css + skb->csum_offset;
1265
1266                 i = adapter->tx_ring.next_to_use;
1267                 context_desc = IXGB_CONTEXT_DESC(adapter->tx_ring, i);
1268                 buffer_info = &adapter->tx_ring.buffer_info[i];
1269                 WARN_ON(buffer_info->dma != 0);
1270
1271                 context_desc->tucss = css;
1272                 context_desc->tucso = cso;
1273                 context_desc->tucse = 0;
1274                 /* zero out any previously existing data in one instruction */
1275                 *(u32 *)&(context_desc->ipcss) = 0;
1276                 context_desc->status = 0;
1277                 context_desc->hdr_len = 0;
1278                 context_desc->mss = 0;
1279                 context_desc->cmd_type_len =
1280                         cpu_to_le32(IXGB_CONTEXT_DESC_TYPE
1281                                     | IXGB_TX_DESC_CMD_IDE);
1282
1283                 if (++i == adapter->tx_ring.count) i = 0;
1284                 adapter->tx_ring.next_to_use = i;
1285
1286                 return true;
1287         }
1288
1289         return false;
1290 }
1291
1292 #define IXGB_MAX_TXD_PWR        14
1293 #define IXGB_MAX_DATA_PER_TXD   (1<<IXGB_MAX_TXD_PWR)
1294
1295 static int
1296 ixgb_tx_map(struct ixgb_adapter *adapter, struct sk_buff *skb,
1297             unsigned int first)
1298 {
1299         struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
1300         struct pci_dev *pdev = adapter->pdev;
1301         struct ixgb_buffer *buffer_info;
1302         int len = skb_headlen(skb);
1303         unsigned int offset = 0, size, count = 0, i;
1304         unsigned int mss = skb_shinfo(skb)->gso_size;
1305         unsigned int nr_frags = skb_shinfo(skb)->nr_frags;
1306         unsigned int f;
1307
1308         i = tx_ring->next_to_use;
1309
1310         while (len) {
1311                 buffer_info = &tx_ring->buffer_info[i];
1312                 size = min(len, IXGB_MAX_DATA_PER_TXD);
1313                 /* Workaround for premature desc write-backs
1314                  * in TSO mode.  Append 4-byte sentinel desc */
1315                 if (unlikely(mss && !nr_frags && size == len && size > 8))
1316                         size -= 4;
1317
1318                 buffer_info->length = size;
1319                 WARN_ON(buffer_info->dma != 0);
1320                 buffer_info->time_stamp = jiffies;
1321                 buffer_info->mapped_as_page = false;
1322                 buffer_info->dma = dma_map_single(&pdev->dev,
1323                                                   skb->data + offset,
1324                                                   size, DMA_TO_DEVICE);
1325                 if (dma_mapping_error(&pdev->dev, buffer_info->dma))
1326                         goto dma_error;
1327                 buffer_info->next_to_watch = 0;
1328
1329                 len -= size;
1330                 offset += size;
1331                 count++;
1332                 if (len) {
1333                         i++;
1334                         if (i == tx_ring->count)
1335                                 i = 0;
1336                 }
1337         }
1338
1339         for (f = 0; f < nr_frags; f++) {
1340                 struct skb_frag_struct *frag;
1341
1342                 frag = &skb_shinfo(skb)->frags[f];
1343                 len = frag->size;
1344                 offset = frag->page_offset;
1345
1346                 while (len) {
1347                         i++;
1348                         if (i == tx_ring->count)
1349                                 i = 0;
1350
1351                         buffer_info = &tx_ring->buffer_info[i];
1352                         size = min(len, IXGB_MAX_DATA_PER_TXD);
1353
1354                         /* Workaround for premature desc write-backs
1355                          * in TSO mode.  Append 4-byte sentinel desc */
1356                         if (unlikely(mss && (f == (nr_frags - 1))
1357                                      && size == len && size > 8))
1358                                 size -= 4;
1359
1360                         buffer_info->length = size;
1361                         buffer_info->time_stamp = jiffies;
1362                         buffer_info->mapped_as_page = true;
1363                         buffer_info->dma =
1364                                 dma_map_page(&pdev->dev, frag->page,
1365                                              offset, size, DMA_TO_DEVICE);
1366                         if (dma_mapping_error(&pdev->dev, buffer_info->dma))
1367                                 goto dma_error;
1368                         buffer_info->next_to_watch = 0;
1369
1370                         len -= size;
1371                         offset += size;
1372                         count++;
1373                 }
1374         }
1375         tx_ring->buffer_info[i].skb = skb;
1376         tx_ring->buffer_info[first].next_to_watch = i;
1377
1378         return count;
1379
1380 dma_error:
1381         dev_err(&pdev->dev, "TX DMA map failed\n");
1382         buffer_info->dma = 0;
1383         if (count)
1384                 count--;
1385
1386         while (count--) {
1387                 if (i==0)
1388                         i += tx_ring->count;
1389                 i--;
1390                 buffer_info = &tx_ring->buffer_info[i];
1391                 ixgb_unmap_and_free_tx_resource(adapter, buffer_info);
1392         }
1393
1394         return 0;
1395 }
1396
1397 static void
1398 ixgb_tx_queue(struct ixgb_adapter *adapter, int count, int vlan_id,int tx_flags)
1399 {
1400         struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
1401         struct ixgb_tx_desc *tx_desc = NULL;
1402         struct ixgb_buffer *buffer_info;
1403         u32 cmd_type_len = adapter->tx_cmd_type;
1404         u8 status = 0;
1405         u8 popts = 0;
1406         unsigned int i;
1407
1408         if (tx_flags & IXGB_TX_FLAGS_TSO) {
1409                 cmd_type_len |= IXGB_TX_DESC_CMD_TSE;
1410                 popts |= (IXGB_TX_DESC_POPTS_IXSM | IXGB_TX_DESC_POPTS_TXSM);
1411         }
1412
1413         if (tx_flags & IXGB_TX_FLAGS_CSUM)
1414                 popts |= IXGB_TX_DESC_POPTS_TXSM;
1415
1416         if (tx_flags & IXGB_TX_FLAGS_VLAN)
1417                 cmd_type_len |= IXGB_TX_DESC_CMD_VLE;
1418
1419         i = tx_ring->next_to_use;
1420
1421         while (count--) {
1422                 buffer_info = &tx_ring->buffer_info[i];
1423                 tx_desc = IXGB_TX_DESC(*tx_ring, i);
1424                 tx_desc->buff_addr = cpu_to_le64(buffer_info->dma);
1425                 tx_desc->cmd_type_len =
1426                         cpu_to_le32(cmd_type_len | buffer_info->length);
1427                 tx_desc->status = status;
1428                 tx_desc->popts = popts;
1429                 tx_desc->vlan = cpu_to_le16(vlan_id);
1430
1431                 if (++i == tx_ring->count) i = 0;
1432         }
1433
1434         tx_desc->cmd_type_len |=
1435                 cpu_to_le32(IXGB_TX_DESC_CMD_EOP | IXGB_TX_DESC_CMD_RS);
1436
1437         /* Force memory writes to complete before letting h/w
1438          * know there are new descriptors to fetch.  (Only
1439          * applicable for weak-ordered memory model archs,
1440          * such as IA-64). */
1441         wmb();
1442
1443         tx_ring->next_to_use = i;
1444         IXGB_WRITE_REG(&adapter->hw, TDT, i);
1445 }
1446
1447 static int __ixgb_maybe_stop_tx(struct net_device *netdev, int size)
1448 {
1449         struct ixgb_adapter *adapter = netdev_priv(netdev);
1450         struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
1451
1452         netif_stop_queue(netdev);
1453         /* Herbert's original patch had:
1454          *  smp_mb__after_netif_stop_queue();
1455          * but since that doesn't exist yet, just open code it. */
1456         smp_mb();
1457
1458         /* We need to check again in a case another CPU has just
1459          * made room available. */
1460         if (likely(IXGB_DESC_UNUSED(tx_ring) < size))
1461                 return -EBUSY;
1462
1463         /* A reprieve! */
1464         netif_start_queue(netdev);
1465         ++adapter->restart_queue;
1466         return 0;
1467 }
1468
1469 static int ixgb_maybe_stop_tx(struct net_device *netdev,
1470                               struct ixgb_desc_ring *tx_ring, int size)
1471 {
1472         if (likely(IXGB_DESC_UNUSED(tx_ring) >= size))
1473                 return 0;
1474         return __ixgb_maybe_stop_tx(netdev, size);
1475 }
1476
1477
1478 /* Tx Descriptors needed, worst case */
1479 #define TXD_USE_COUNT(S) (((S) >> IXGB_MAX_TXD_PWR) + \
1480                          (((S) & (IXGB_MAX_DATA_PER_TXD - 1)) ? 1 : 0))
1481 #define DESC_NEEDED TXD_USE_COUNT(IXGB_MAX_DATA_PER_TXD) /* skb->date */ + \
1482         MAX_SKB_FRAGS * TXD_USE_COUNT(PAGE_SIZE) + 1 /* for context */ \
1483         + 1 /* one more needed for sentinel TSO workaround */
1484
1485 static netdev_tx_t
1486 ixgb_xmit_frame(struct sk_buff *skb, struct net_device *netdev)
1487 {
1488         struct ixgb_adapter *adapter = netdev_priv(netdev);
1489         unsigned int first;
1490         unsigned int tx_flags = 0;
1491         int vlan_id = 0;
1492         int count = 0;
1493         int tso;
1494
1495         if (test_bit(__IXGB_DOWN, &adapter->flags)) {
1496                 dev_kfree_skb(skb);
1497                 return NETDEV_TX_OK;
1498         }
1499
1500         if (skb->len <= 0) {
1501                 dev_kfree_skb(skb);
1502                 return NETDEV_TX_OK;
1503         }
1504
1505         if (unlikely(ixgb_maybe_stop_tx(netdev, &adapter->tx_ring,
1506                      DESC_NEEDED)))
1507                 return NETDEV_TX_BUSY;
1508
1509         if (vlan_tx_tag_present(skb)) {
1510                 tx_flags |= IXGB_TX_FLAGS_VLAN;
1511                 vlan_id = vlan_tx_tag_get(skb);
1512         }
1513
1514         first = adapter->tx_ring.next_to_use;
1515
1516         tso = ixgb_tso(adapter, skb);
1517         if (tso < 0) {
1518                 dev_kfree_skb(skb);
1519                 return NETDEV_TX_OK;
1520         }
1521
1522         if (likely(tso))
1523                 tx_flags |= IXGB_TX_FLAGS_TSO;
1524         else if (ixgb_tx_csum(adapter, skb))
1525                 tx_flags |= IXGB_TX_FLAGS_CSUM;
1526
1527         count = ixgb_tx_map(adapter, skb, first);
1528
1529         if (count) {
1530                 ixgb_tx_queue(adapter, count, vlan_id, tx_flags);
1531                 /* Make sure there is space in the ring for the next send. */
1532                 ixgb_maybe_stop_tx(netdev, &adapter->tx_ring, DESC_NEEDED);
1533
1534         } else {
1535                 dev_kfree_skb_any(skb);
1536                 adapter->tx_ring.buffer_info[first].time_stamp = 0;
1537                 adapter->tx_ring.next_to_use = first;
1538         }
1539
1540         return NETDEV_TX_OK;
1541 }
1542
1543 /**
1544  * ixgb_tx_timeout - Respond to a Tx Hang
1545  * @netdev: network interface device structure
1546  **/
1547
1548 static void
1549 ixgb_tx_timeout(struct net_device *netdev)
1550 {
1551         struct ixgb_adapter *adapter = netdev_priv(netdev);
1552
1553         /* Do the reset outside of interrupt context */
1554         schedule_work(&adapter->tx_timeout_task);
1555 }
1556
1557 static void
1558 ixgb_tx_timeout_task(struct work_struct *work)
1559 {
1560         struct ixgb_adapter *adapter =
1561                 container_of(work, struct ixgb_adapter, tx_timeout_task);
1562
1563         adapter->tx_timeout_count++;
1564         ixgb_down(adapter, true);
1565         ixgb_up(adapter);
1566 }
1567
1568 /**
1569  * ixgb_get_stats - Get System Network Statistics
1570  * @netdev: network interface device structure
1571  *
1572  * Returns the address of the device statistics structure.
1573  * The statistics are actually updated from the timer callback.
1574  **/
1575
1576 static struct net_device_stats *
1577 ixgb_get_stats(struct net_device *netdev)
1578 {
1579         return &netdev->stats;
1580 }
1581
1582 /**
1583  * ixgb_change_mtu - Change the Maximum Transfer Unit
1584  * @netdev: network interface device structure
1585  * @new_mtu: new value for maximum frame size
1586  *
1587  * Returns 0 on success, negative on failure
1588  **/
1589
1590 static int
1591 ixgb_change_mtu(struct net_device *netdev, int new_mtu)
1592 {
1593         struct ixgb_adapter *adapter = netdev_priv(netdev);
1594         int max_frame = new_mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;
1595         int old_max_frame = netdev->mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;
1596
1597         /* MTU < 68 is an error for IPv4 traffic, just don't allow it */
1598         if ((new_mtu < 68) ||
1599             (max_frame > IXGB_MAX_JUMBO_FRAME_SIZE + ENET_FCS_LENGTH)) {
1600                 netif_err(adapter, probe, adapter->netdev,
1601                           "Invalid MTU setting %d\n", new_mtu);
1602                 return -EINVAL;
1603         }
1604
1605         if (old_max_frame == max_frame)
1606                 return 0;
1607
1608         if (netif_running(netdev))
1609                 ixgb_down(adapter, true);
1610
1611         adapter->rx_buffer_len = max_frame + 8; /* + 8 for errata */
1612
1613         netdev->mtu = new_mtu;
1614
1615         if (netif_running(netdev))
1616                 ixgb_up(adapter);
1617
1618         return 0;
1619 }
1620
1621 /**
1622  * ixgb_update_stats - Update the board statistics counters.
1623  * @adapter: board private structure
1624  **/
1625
1626 void
1627 ixgb_update_stats(struct ixgb_adapter *adapter)
1628 {
1629         struct net_device *netdev = adapter->netdev;
1630         struct pci_dev *pdev = adapter->pdev;
1631
1632         /* Prevent stats update while adapter is being reset */
1633         if (pci_channel_offline(pdev))
1634                 return;
1635
1636         if ((netdev->flags & IFF_PROMISC) || (netdev->flags & IFF_ALLMULTI) ||
1637            (netdev_mc_count(netdev) > IXGB_MAX_NUM_MULTICAST_ADDRESSES)) {
1638                 u64 multi = IXGB_READ_REG(&adapter->hw, MPRCL);
1639                 u32 bcast_l = IXGB_READ_REG(&adapter->hw, BPRCL);
1640                 u32 bcast_h = IXGB_READ_REG(&adapter->hw, BPRCH);
1641                 u64 bcast = ((u64)bcast_h << 32) | bcast_l;
1642
1643                 multi |= ((u64)IXGB_READ_REG(&adapter->hw, MPRCH) << 32);
1644                 /* fix up multicast stats by removing broadcasts */
1645                 if (multi >= bcast)
1646                         multi -= bcast;
1647
1648                 adapter->stats.mprcl += (multi & 0xFFFFFFFF);
1649                 adapter->stats.mprch += (multi >> 32);
1650                 adapter->stats.bprcl += bcast_l;
1651                 adapter->stats.bprch += bcast_h;
1652         } else {
1653                 adapter->stats.mprcl += IXGB_READ_REG(&adapter->hw, MPRCL);
1654                 adapter->stats.mprch += IXGB_READ_REG(&adapter->hw, MPRCH);
1655                 adapter->stats.bprcl += IXGB_READ_REG(&adapter->hw, BPRCL);
1656                 adapter->stats.bprch += IXGB_READ_REG(&adapter->hw, BPRCH);
1657         }
1658         adapter->stats.tprl += IXGB_READ_REG(&adapter->hw, TPRL);
1659         adapter->stats.tprh += IXGB_READ_REG(&adapter->hw, TPRH);
1660         adapter->stats.gprcl += IXGB_READ_REG(&adapter->hw, GPRCL);
1661         adapter->stats.gprch += IXGB_READ_REG(&adapter->hw, GPRCH);
1662         adapter->stats.uprcl += IXGB_READ_REG(&adapter->hw, UPRCL);
1663         adapter->stats.uprch += IXGB_READ_REG(&adapter->hw, UPRCH);
1664         adapter->stats.vprcl += IXGB_READ_REG(&adapter->hw, VPRCL);
1665         adapter->stats.vprch += IXGB_READ_REG(&adapter->hw, VPRCH);
1666         adapter->stats.jprcl += IXGB_READ_REG(&adapter->hw, JPRCL);
1667         adapter->stats.jprch += IXGB_READ_REG(&adapter->hw, JPRCH);
1668         adapter->stats.gorcl += IXGB_READ_REG(&adapter->hw, GORCL);
1669         adapter->stats.gorch += IXGB_READ_REG(&adapter->hw, GORCH);
1670         adapter->stats.torl += IXGB_READ_REG(&adapter->hw, TORL);
1671         adapter->stats.torh += IXGB_READ_REG(&adapter->hw, TORH);
1672         adapter->stats.rnbc += IXGB_READ_REG(&adapter->hw, RNBC);
1673         adapter->stats.ruc += IXGB_READ_REG(&adapter->hw, RUC);
1674         adapter->stats.roc += IXGB_READ_REG(&adapter->hw, ROC);
1675         adapter->stats.rlec += IXGB_READ_REG(&adapter->hw, RLEC);
1676         adapter->stats.crcerrs += IXGB_READ_REG(&adapter->hw, CRCERRS);
1677         adapter->stats.icbc += IXGB_READ_REG(&adapter->hw, ICBC);
1678         adapter->stats.ecbc += IXGB_READ_REG(&adapter->hw, ECBC);
1679         adapter->stats.mpc += IXGB_READ_REG(&adapter->hw, MPC);
1680         adapter->stats.tptl += IXGB_READ_REG(&adapter->hw, TPTL);
1681         adapter->stats.tpth += IXGB_READ_REG(&adapter->hw, TPTH);
1682         adapter->stats.gptcl += IXGB_READ_REG(&adapter->hw, GPTCL);
1683         adapter->stats.gptch += IXGB_READ_REG(&adapter->hw, GPTCH);
1684         adapter->stats.bptcl += IXGB_READ_REG(&adapter->hw, BPTCL);
1685         adapter->stats.bptch += IXGB_READ_REG(&adapter->hw, BPTCH);
1686         adapter->stats.mptcl += IXGB_READ_REG(&adapter->hw, MPTCL);
1687         adapter->stats.mptch += IXGB_READ_REG(&adapter->hw, MPTCH);
1688         adapter->stats.uptcl += IXGB_READ_REG(&adapter->hw, UPTCL);
1689         adapter->stats.uptch += IXGB_READ_REG(&adapter->hw, UPTCH);
1690         adapter->stats.vptcl += IXGB_READ_REG(&adapter->hw, VPTCL);
1691         adapter->stats.vptch += IXGB_READ_REG(&adapter->hw, VPTCH);
1692         adapter->stats.jptcl += IXGB_READ_REG(&adapter->hw, JPTCL);
1693         adapter->stats.jptch += IXGB_READ_REG(&adapter->hw, JPTCH);
1694         adapter->stats.gotcl += IXGB_READ_REG(&adapter->hw, GOTCL);
1695         adapter->stats.gotch += IXGB_READ_REG(&adapter->hw, GOTCH);
1696         adapter->stats.totl += IXGB_READ_REG(&adapter->hw, TOTL);
1697         adapter->stats.toth += IXGB_READ_REG(&adapter->hw, TOTH);
1698         adapter->stats.dc += IXGB_READ_REG(&adapter->hw, DC);
1699         adapter->stats.plt64c += IXGB_READ_REG(&adapter->hw, PLT64C);
1700         adapter->stats.tsctc += IXGB_READ_REG(&adapter->hw, TSCTC);
1701         adapter->stats.tsctfc += IXGB_READ_REG(&adapter->hw, TSCTFC);
1702         adapter->stats.ibic += IXGB_READ_REG(&adapter->hw, IBIC);
1703         adapter->stats.rfc += IXGB_READ_REG(&adapter->hw, RFC);
1704         adapter->stats.lfc += IXGB_READ_REG(&adapter->hw, LFC);
1705         adapter->stats.pfrc += IXGB_READ_REG(&adapter->hw, PFRC);
1706         adapter->stats.pftc += IXGB_READ_REG(&adapter->hw, PFTC);
1707         adapter->stats.mcfrc += IXGB_READ_REG(&adapter->hw, MCFRC);
1708         adapter->stats.mcftc += IXGB_READ_REG(&adapter->hw, MCFTC);
1709         adapter->stats.xonrxc += IXGB_READ_REG(&adapter->hw, XONRXC);
1710         adapter->stats.xontxc += IXGB_READ_REG(&adapter->hw, XONTXC);
1711         adapter->stats.xoffrxc += IXGB_READ_REG(&adapter->hw, XOFFRXC);
1712         adapter->stats.xofftxc += IXGB_READ_REG(&adapter->hw, XOFFTXC);
1713         adapter->stats.rjc += IXGB_READ_REG(&adapter->hw, RJC);
1714
1715         /* Fill out the OS statistics structure */
1716
1717         netdev->stats.rx_packets = adapter->stats.gprcl;
1718         netdev->stats.tx_packets = adapter->stats.gptcl;
1719         netdev->stats.rx_bytes = adapter->stats.gorcl;
1720         netdev->stats.tx_bytes = adapter->stats.gotcl;
1721         netdev->stats.multicast = adapter->stats.mprcl;
1722         netdev->stats.collisions = 0;
1723
1724         /* ignore RLEC as it reports errors for padded (<64bytes) frames
1725          * with a length in the type/len field */
1726         netdev->stats.rx_errors =
1727             /* adapter->stats.rnbc + */ adapter->stats.crcerrs +
1728             adapter->stats.ruc +
1729             adapter->stats.roc /*+ adapter->stats.rlec */  +
1730             adapter->stats.icbc +
1731             adapter->stats.ecbc + adapter->stats.mpc;
1732
1733         /* see above
1734          * netdev->stats.rx_length_errors = adapter->stats.rlec;
1735          */
1736
1737         netdev->stats.rx_crc_errors = adapter->stats.crcerrs;
1738         netdev->stats.rx_fifo_errors = adapter->stats.mpc;
1739         netdev->stats.rx_missed_errors = adapter->stats.mpc;
1740         netdev->stats.rx_over_errors = adapter->stats.mpc;
1741
1742         netdev->stats.tx_errors = 0;
1743         netdev->stats.rx_frame_errors = 0;
1744         netdev->stats.tx_aborted_errors = 0;
1745         netdev->stats.tx_carrier_errors = 0;
1746         netdev->stats.tx_fifo_errors = 0;
1747         netdev->stats.tx_heartbeat_errors = 0;
1748         netdev->stats.tx_window_errors = 0;
1749 }
1750
1751 #define IXGB_MAX_INTR 10
1752 /**
1753  * ixgb_intr - Interrupt Handler
1754  * @irq: interrupt number
1755  * @data: pointer to a network interface device structure
1756  **/
1757
1758 static irqreturn_t
1759 ixgb_intr(int irq, void *data)
1760 {
1761         struct net_device *netdev = data;
1762         struct ixgb_adapter *adapter = netdev_priv(netdev);
1763         struct ixgb_hw *hw = &adapter->hw;
1764         u32 icr = IXGB_READ_REG(hw, ICR);
1765
1766         if (unlikely(!icr))
1767                 return IRQ_NONE;  /* Not our interrupt */
1768
1769         if (unlikely(icr & (IXGB_INT_RXSEQ | IXGB_INT_LSC)))
1770                 if (!test_bit(__IXGB_DOWN, &adapter->flags))
1771                         mod_timer(&adapter->watchdog_timer, jiffies);
1772
1773         if (napi_schedule_prep(&adapter->napi)) {
1774
1775                 /* Disable interrupts and register for poll. The flush
1776                   of the posted write is intentionally left out.
1777                 */
1778
1779                 IXGB_WRITE_REG(&adapter->hw, IMC, ~0);
1780                 __napi_schedule(&adapter->napi);
1781         }
1782         return IRQ_HANDLED;
1783 }
1784
1785 /**
1786  * ixgb_clean - NAPI Rx polling callback
1787  * @adapter: board private structure
1788  **/
1789
1790 static int
1791 ixgb_clean(struct napi_struct *napi, int budget)
1792 {
1793         struct ixgb_adapter *adapter = container_of(napi, struct ixgb_adapter, napi);
1794         int work_done = 0;
1795
1796         ixgb_clean_tx_irq(adapter);
1797         ixgb_clean_rx_irq(adapter, &work_done, budget);
1798
1799         /* If budget not fully consumed, exit the polling mode */
1800         if (work_done < budget) {
1801                 napi_complete(napi);
1802                 if (!test_bit(__IXGB_DOWN, &adapter->flags))
1803                         ixgb_irq_enable(adapter);
1804         }
1805
1806         return work_done;
1807 }
1808
1809 /**
1810  * ixgb_clean_tx_irq - Reclaim resources after transmit completes
1811  * @adapter: board private structure
1812  **/
1813
1814 static bool
1815 ixgb_clean_tx_irq(struct ixgb_adapter *adapter)
1816 {
1817         struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
1818         struct net_device *netdev = adapter->netdev;
1819         struct ixgb_tx_desc *tx_desc, *eop_desc;
1820         struct ixgb_buffer *buffer_info;
1821         unsigned int i, eop;
1822         bool cleaned = false;
1823
1824         i = tx_ring->next_to_clean;
1825         eop = tx_ring->buffer_info[i].next_to_watch;
1826         eop_desc = IXGB_TX_DESC(*tx_ring, eop);
1827
1828         while (eop_desc->status & IXGB_TX_DESC_STATUS_DD) {
1829
1830                 rmb(); /* read buffer_info after eop_desc */
1831                 for (cleaned = false; !cleaned; ) {
1832                         tx_desc = IXGB_TX_DESC(*tx_ring, i);
1833                         buffer_info = &tx_ring->buffer_info[i];
1834
1835                         if (tx_desc->popts &
1836                            (IXGB_TX_DESC_POPTS_TXSM |
1837                             IXGB_TX_DESC_POPTS_IXSM))
1838                                 adapter->hw_csum_tx_good++;
1839
1840                         ixgb_unmap_and_free_tx_resource(adapter, buffer_info);
1841
1842                         *(u32 *)&(tx_desc->status) = 0;
1843
1844                         cleaned = (i == eop);
1845                         if (++i == tx_ring->count) i = 0;
1846                 }
1847
1848                 eop = tx_ring->buffer_info[i].next_to_watch;
1849                 eop_desc = IXGB_TX_DESC(*tx_ring, eop);
1850         }
1851
1852         tx_ring->next_to_clean = i;
1853
1854         if (unlikely(cleaned && netif_carrier_ok(netdev) &&
1855                      IXGB_DESC_UNUSED(tx_ring) >= DESC_NEEDED)) {
1856                 /* Make sure that anybody stopping the queue after this
1857                  * sees the new next_to_clean. */
1858                 smp_mb();
1859
1860                 if (netif_queue_stopped(netdev) &&
1861                     !(test_bit(__IXGB_DOWN, &adapter->flags))) {
1862                         netif_wake_queue(netdev);
1863                         ++adapter->restart_queue;
1864                 }
1865         }
1866
1867         if (adapter->detect_tx_hung) {
1868                 /* detect a transmit hang in hardware, this serializes the
1869                  * check with the clearing of time_stamp and movement of i */
1870                 adapter->detect_tx_hung = false;
1871                 if (tx_ring->buffer_info[eop].time_stamp &&
1872                    time_after(jiffies, tx_ring->buffer_info[eop].time_stamp + HZ)
1873                    && !(IXGB_READ_REG(&adapter->hw, STATUS) &
1874                         IXGB_STATUS_TXOFF)) {
1875                         /* detected Tx unit hang */
1876                         netif_err(adapter, drv, adapter->netdev,
1877                                   "Detected Tx Unit Hang\n"
1878                                   "  TDH                  <%x>\n"
1879                                   "  TDT                  <%x>\n"
1880                                   "  next_to_use          <%x>\n"
1881                                   "  next_to_clean        <%x>\n"
1882                                   "buffer_info[next_to_clean]\n"
1883                                   "  time_stamp           <%lx>\n"
1884                                   "  next_to_watch        <%x>\n"
1885                                   "  jiffies              <%lx>\n"
1886                                   "  next_to_watch.status <%x>\n",
1887                                   IXGB_READ_REG(&adapter->hw, TDH),
1888                                   IXGB_READ_REG(&adapter->hw, TDT),
1889                                   tx_ring->next_to_use,
1890                                   tx_ring->next_to_clean,
1891                                   tx_ring->buffer_info[eop].time_stamp,
1892                                   eop,
1893                                   jiffies,
1894                                   eop_desc->status);
1895                         netif_stop_queue(netdev);
1896                 }
1897         }
1898
1899         return cleaned;
1900 }
1901
1902 /**
1903  * ixgb_rx_checksum - Receive Checksum Offload for 82597.
1904  * @adapter: board private structure
1905  * @rx_desc: receive descriptor
1906  * @sk_buff: socket buffer with received data
1907  **/
1908
1909 static void
1910 ixgb_rx_checksum(struct ixgb_adapter *adapter,
1911                  struct ixgb_rx_desc *rx_desc,
1912                  struct sk_buff *skb)
1913 {
1914         /* Ignore Checksum bit is set OR
1915          * TCP Checksum has not been calculated
1916          */
1917         if ((rx_desc->status & IXGB_RX_DESC_STATUS_IXSM) ||
1918            (!(rx_desc->status & IXGB_RX_DESC_STATUS_TCPCS))) {
1919                 skb_checksum_none_assert(skb);
1920                 return;
1921         }
1922
1923         /* At this point we know the hardware did the TCP checksum */
1924         /* now look at the TCP checksum error bit */
1925         if (rx_desc->errors & IXGB_RX_DESC_ERRORS_TCPE) {
1926                 /* let the stack verify checksum errors */
1927                 skb_checksum_none_assert(skb);
1928                 adapter->hw_csum_rx_error++;
1929         } else {
1930                 /* TCP checksum is good */
1931                 skb->ip_summed = CHECKSUM_UNNECESSARY;
1932                 adapter->hw_csum_rx_good++;
1933         }
1934 }
1935
1936 /*
1937  * this should improve performance for small packets with large amounts
1938  * of reassembly being done in the stack
1939  */
1940 static void ixgb_check_copybreak(struct net_device *netdev,
1941                                  struct ixgb_buffer *buffer_info,
1942                                  u32 length, struct sk_buff **skb)
1943 {
1944         struct sk_buff *new_skb;
1945
1946         if (length > copybreak)
1947                 return;
1948
1949         new_skb = netdev_alloc_skb_ip_align(netdev, length);
1950         if (!new_skb)
1951                 return;
1952
1953         skb_copy_to_linear_data_offset(new_skb, -NET_IP_ALIGN,
1954                                        (*skb)->data - NET_IP_ALIGN,
1955                                        length + NET_IP_ALIGN);
1956         /* save the skb in buffer_info as good */
1957         buffer_info->skb = *skb;
1958         *skb = new_skb;
1959 }
1960
1961 /**
1962  * ixgb_clean_rx_irq - Send received data up the network stack,
1963  * @adapter: board private structure
1964  **/
1965
1966 static bool
1967 ixgb_clean_rx_irq(struct ixgb_adapter *adapter, int *work_done, int work_to_do)
1968 {
1969         struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
1970         struct net_device *netdev = adapter->netdev;
1971         struct pci_dev *pdev = adapter->pdev;
1972         struct ixgb_rx_desc *rx_desc, *next_rxd;
1973         struct ixgb_buffer *buffer_info, *next_buffer, *next2_buffer;
1974         u32 length;
1975         unsigned int i, j;
1976         int cleaned_count = 0;
1977         bool cleaned = false;
1978
1979         i = rx_ring->next_to_clean;
1980         rx_desc = IXGB_RX_DESC(*rx_ring, i);
1981         buffer_info = &rx_ring->buffer_info[i];
1982
1983         while (rx_desc->status & IXGB_RX_DESC_STATUS_DD) {
1984                 struct sk_buff *skb;
1985                 u8 status;
1986
1987                 if (*work_done >= work_to_do)
1988                         break;
1989
1990                 (*work_done)++;
1991                 rmb();  /* read descriptor and rx_buffer_info after status DD */
1992                 status = rx_desc->status;
1993                 skb = buffer_info->skb;
1994                 buffer_info->skb = NULL;
1995
1996                 prefetch(skb->data - NET_IP_ALIGN);
1997
1998                 if (++i == rx_ring->count)
1999                         i = 0;
2000                 next_rxd = IXGB_RX_DESC(*rx_ring, i);
2001                 prefetch(next_rxd);
2002
2003                 j = i + 1;
2004                 if (j == rx_ring->count)
2005                         j = 0;
2006                 next2_buffer = &rx_ring->buffer_info[j];
2007                 prefetch(next2_buffer);
2008
2009                 next_buffer = &rx_ring->buffer_info[i];
2010
2011                 cleaned = true;
2012                 cleaned_count++;
2013
2014                 dma_unmap_single(&pdev->dev,
2015                                  buffer_info->dma,
2016                                  buffer_info->length,
2017                                  DMA_FROM_DEVICE);
2018                 buffer_info->dma = 0;
2019
2020                 length = le16_to_cpu(rx_desc->length);
2021                 rx_desc->length = 0;
2022
2023                 if (unlikely(!(status & IXGB_RX_DESC_STATUS_EOP))) {
2024
2025                         /* All receives must fit into a single buffer */
2026
2027                         IXGB_DBG("Receive packet consumed multiple buffers "
2028                                          "length<%x>\n", length);
2029
2030                         dev_kfree_skb_irq(skb);
2031                         goto rxdesc_done;
2032                 }
2033
2034                 if (unlikely(rx_desc->errors &
2035                     (IXGB_RX_DESC_ERRORS_CE | IXGB_RX_DESC_ERRORS_SE |
2036                      IXGB_RX_DESC_ERRORS_P | IXGB_RX_DESC_ERRORS_RXE))) {
2037                         dev_kfree_skb_irq(skb);
2038                         goto rxdesc_done;
2039                 }
2040
2041                 ixgb_check_copybreak(netdev, buffer_info, length, &skb);
2042
2043                 /* Good Receive */
2044                 skb_put(skb, length);
2045
2046                 /* Receive Checksum Offload */
2047                 ixgb_rx_checksum(adapter, rx_desc, skb);
2048
2049                 skb->protocol = eth_type_trans(skb, netdev);
2050                 if (status & IXGB_RX_DESC_STATUS_VP)
2051                         __vlan_hwaccel_put_tag(skb,
2052                                                le16_to_cpu(rx_desc->special));
2053
2054                 netif_receive_skb(skb);
2055
2056 rxdesc_done:
2057                 /* clean up descriptor, might be written over by hw */
2058                 rx_desc->status = 0;
2059
2060                 /* return some buffers to hardware, one at a time is too slow */
2061                 if (unlikely(cleaned_count >= IXGB_RX_BUFFER_WRITE)) {
2062                         ixgb_alloc_rx_buffers(adapter, cleaned_count);
2063                         cleaned_count = 0;
2064                 }
2065
2066                 /* use prefetched values */
2067                 rx_desc = next_rxd;
2068                 buffer_info = next_buffer;
2069         }
2070
2071         rx_ring->next_to_clean = i;
2072
2073         cleaned_count = IXGB_DESC_UNUSED(rx_ring);
2074         if (cleaned_count)
2075                 ixgb_alloc_rx_buffers(adapter, cleaned_count);
2076
2077         return cleaned;
2078 }
2079
2080 /**
2081  * ixgb_alloc_rx_buffers - Replace used receive buffers
2082  * @adapter: address of board private structure
2083  **/
2084
2085 static void
2086 ixgb_alloc_rx_buffers(struct ixgb_adapter *adapter, int cleaned_count)
2087 {
2088         struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
2089         struct net_device *netdev = adapter->netdev;
2090         struct pci_dev *pdev = adapter->pdev;
2091         struct ixgb_rx_desc *rx_desc;
2092         struct ixgb_buffer *buffer_info;
2093         struct sk_buff *skb;
2094         unsigned int i;
2095         long cleancount;
2096
2097         i = rx_ring->next_to_use;
2098         buffer_info = &rx_ring->buffer_info[i];
2099         cleancount = IXGB_DESC_UNUSED(rx_ring);
2100
2101
2102         /* leave three descriptors unused */
2103         while (--cleancount > 2 && cleaned_count--) {
2104                 /* recycle! its good for you */
2105                 skb = buffer_info->skb;
2106                 if (skb) {
2107                         skb_trim(skb, 0);
2108                         goto map_skb;
2109                 }
2110
2111                 skb = netdev_alloc_skb_ip_align(netdev, adapter->rx_buffer_len);
2112                 if (unlikely(!skb)) {
2113                         /* Better luck next round */
2114                         adapter->alloc_rx_buff_failed++;
2115                         break;
2116                 }
2117
2118                 buffer_info->skb = skb;
2119                 buffer_info->length = adapter->rx_buffer_len;
2120 map_skb:
2121                 buffer_info->dma = dma_map_single(&pdev->dev,
2122                                                   skb->data,
2123                                                   adapter->rx_buffer_len,
2124                                                   DMA_FROM_DEVICE);
2125
2126                 rx_desc = IXGB_RX_DESC(*rx_ring, i);
2127                 rx_desc->buff_addr = cpu_to_le64(buffer_info->dma);
2128                 /* guarantee DD bit not set now before h/w gets descriptor
2129                  * this is the rest of the workaround for h/w double
2130                  * writeback. */
2131                 rx_desc->status = 0;
2132
2133
2134                 if (++i == rx_ring->count) i = 0;
2135                 buffer_info = &rx_ring->buffer_info[i];
2136         }
2137
2138         if (likely(rx_ring->next_to_use != i)) {
2139                 rx_ring->next_to_use = i;
2140                 if (unlikely(i-- == 0))
2141                         i = (rx_ring->count - 1);
2142
2143                 /* Force memory writes to complete before letting h/w
2144                  * know there are new descriptors to fetch.  (Only
2145                  * applicable for weak-ordered memory model archs, such
2146                  * as IA-64). */
2147                 wmb();
2148                 IXGB_WRITE_REG(&adapter->hw, RDT, i);
2149         }
2150 }
2151
2152 static void
2153 ixgb_vlan_strip_enable(struct ixgb_adapter *adapter)
2154 {
2155         u32 ctrl;
2156
2157         /* enable VLAN tag insert/strip */
2158         ctrl = IXGB_READ_REG(&adapter->hw, CTRL0);
2159         ctrl |= IXGB_CTRL0_VME;
2160         IXGB_WRITE_REG(&adapter->hw, CTRL0, ctrl);
2161 }
2162
2163 static void
2164 ixgb_vlan_strip_disable(struct ixgb_adapter *adapter)
2165 {
2166         u32 ctrl;
2167
2168         /* disable VLAN tag insert/strip */
2169         ctrl = IXGB_READ_REG(&adapter->hw, CTRL0);
2170         ctrl &= ~IXGB_CTRL0_VME;
2171         IXGB_WRITE_REG(&adapter->hw, CTRL0, ctrl);
2172 }
2173
2174 static void
2175 ixgb_vlan_rx_add_vid(struct net_device *netdev, u16 vid)
2176 {
2177         struct ixgb_adapter *adapter = netdev_priv(netdev);
2178         u32 vfta, index;
2179
2180         /* add VID to filter table */
2181
2182         index = (vid >> 5) & 0x7F;
2183         vfta = IXGB_READ_REG_ARRAY(&adapter->hw, VFTA, index);
2184         vfta |= (1 << (vid & 0x1F));
2185         ixgb_write_vfta(&adapter->hw, index, vfta);
2186         set_bit(vid, adapter->active_vlans);
2187 }
2188
2189 static void
2190 ixgb_vlan_rx_kill_vid(struct net_device *netdev, u16 vid)
2191 {
2192         struct ixgb_adapter *adapter = netdev_priv(netdev);
2193         u32 vfta, index;
2194
2195         /* remove VID from filter table */
2196
2197         index = (vid >> 5) & 0x7F;
2198         vfta = IXGB_READ_REG_ARRAY(&adapter->hw, VFTA, index);
2199         vfta &= ~(1 << (vid & 0x1F));
2200         ixgb_write_vfta(&adapter->hw, index, vfta);
2201         clear_bit(vid, adapter->active_vlans);
2202 }
2203
2204 static void
2205 ixgb_restore_vlan(struct ixgb_adapter *adapter)
2206 {
2207         u16 vid;
2208
2209         for_each_set_bit(vid, adapter->active_vlans, VLAN_N_VID)
2210                 ixgb_vlan_rx_add_vid(adapter->netdev, vid);
2211 }
2212
2213 #ifdef CONFIG_NET_POLL_CONTROLLER
2214 /*
2215  * Polling 'interrupt' - used by things like netconsole to send skbs
2216  * without having to re-enable interrupts. It's not called while
2217  * the interrupt routine is executing.
2218  */
2219
2220 static void ixgb_netpoll(struct net_device *dev)
2221 {
2222         struct ixgb_adapter *adapter = netdev_priv(dev);
2223
2224         disable_irq(adapter->pdev->irq);
2225         ixgb_intr(adapter->pdev->irq, dev);
2226         enable_irq(adapter->pdev->irq);
2227 }
2228 #endif
2229
2230 /**
2231  * ixgb_io_error_detected() - called when PCI error is detected
2232  * @pdev    pointer to pci device with error
2233  * @state   pci channel state after error
2234  *
2235  * This callback is called by the PCI subsystem whenever
2236  * a PCI bus error is detected.
2237  */
2238 static pci_ers_result_t ixgb_io_error_detected(struct pci_dev *pdev,
2239                                                enum pci_channel_state state)
2240 {
2241         struct net_device *netdev = pci_get_drvdata(pdev);
2242         struct ixgb_adapter *adapter = netdev_priv(netdev);
2243
2244         netif_device_detach(netdev);
2245
2246         if (state == pci_channel_io_perm_failure)
2247                 return PCI_ERS_RESULT_DISCONNECT;
2248
2249         if (netif_running(netdev))
2250                 ixgb_down(adapter, true);
2251
2252         pci_disable_device(pdev);
2253
2254         /* Request a slot reset. */
2255         return PCI_ERS_RESULT_NEED_RESET;
2256 }
2257
2258 /**
2259  * ixgb_io_slot_reset - called after the pci bus has been reset.
2260  * @pdev    pointer to pci device with error
2261  *
2262  * This callback is called after the PCI bus has been reset.
2263  * Basically, this tries to restart the card from scratch.
2264  * This is a shortened version of the device probe/discovery code,
2265  * it resembles the first-half of the ixgb_probe() routine.
2266  */
2267 static pci_ers_result_t ixgb_io_slot_reset(struct pci_dev *pdev)
2268 {
2269         struct net_device *netdev = pci_get_drvdata(pdev);
2270         struct ixgb_adapter *adapter = netdev_priv(netdev);
2271
2272         if (pci_enable_device(pdev)) {
2273                 netif_err(adapter, probe, adapter->netdev,
2274                           "Cannot re-enable PCI device after reset\n");
2275                 return PCI_ERS_RESULT_DISCONNECT;
2276         }
2277
2278         /* Perform card reset only on one instance of the card */
2279         if (0 != PCI_FUNC (pdev->devfn))
2280                 return PCI_ERS_RESULT_RECOVERED;
2281
2282         pci_set_master(pdev);
2283
2284         netif_carrier_off(netdev);
2285         netif_stop_queue(netdev);
2286         ixgb_reset(adapter);
2287
2288         /* Make sure the EEPROM is good */
2289         if (!ixgb_validate_eeprom_checksum(&adapter->hw)) {
2290                 netif_err(adapter, probe, adapter->netdev,
2291                           "After reset, the EEPROM checksum is not valid\n");
2292                 return PCI_ERS_RESULT_DISCONNECT;
2293         }
2294         ixgb_get_ee_mac_addr(&adapter->hw, netdev->dev_addr);
2295         memcpy(netdev->perm_addr, netdev->dev_addr, netdev->addr_len);
2296
2297         if (!is_valid_ether_addr(netdev->perm_addr)) {
2298                 netif_err(adapter, probe, adapter->netdev,
2299                           "After reset, invalid MAC address\n");
2300                 return PCI_ERS_RESULT_DISCONNECT;
2301         }
2302
2303         return PCI_ERS_RESULT_RECOVERED;
2304 }
2305
2306 /**
2307  * ixgb_io_resume - called when its OK to resume normal operations
2308  * @pdev    pointer to pci device with error
2309  *
2310  * The error recovery driver tells us that its OK to resume
2311  * normal operation. Implementation resembles the second-half
2312  * of the ixgb_probe() routine.
2313  */
2314 static void ixgb_io_resume(struct pci_dev *pdev)
2315 {
2316         struct net_device *netdev = pci_get_drvdata(pdev);
2317         struct ixgb_adapter *adapter = netdev_priv(netdev);
2318
2319         pci_set_master(pdev);
2320
2321         if (netif_running(netdev)) {
2322                 if (ixgb_up(adapter)) {
2323                         pr_err("can't bring device back up after reset\n");
2324                         return;
2325                 }
2326         }
2327
2328         netif_device_attach(netdev);
2329         mod_timer(&adapter->watchdog_timer, jiffies);
2330 }
2331
2332 /* ixgb_main.c */