linux/drivers/net/ethernet/intel/ixgb/ixgb_main.c
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   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
  34char ixgb_driver_name[] = "ixgb";
  35static char ixgb_driver_string[] = "Intel(R) PRO/10GbE Network Driver";
  36
  37#define DRIVERNAPI "-NAPI"
  38#define DRV_VERSION "1.0.135-k2" DRIVERNAPI
  39const char ixgb_driver_version[] = DRV_VERSION;
  40static const char ixgb_copyright[] = "Copyright (c) 1999-2008 Intel Corporation.";
  41
  42#define IXGB_CB_LENGTH 256
  43static unsigned int copybreak __read_mostly = IXGB_CB_LENGTH;
  44module_param(copybreak, uint, 0644);
  45MODULE_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 */
  56static const struct pci_device_id ixgb_pci_tbl[] = {
  57        {PCI_VENDOR_ID_INTEL, IXGB_DEVICE_ID_82597EX,
  58         PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
  59        {PCI_VENDOR_ID_INTEL, IXGB_DEVICE_ID_82597EX_CX4,
  60         PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
  61        {PCI_VENDOR_ID_INTEL, IXGB_DEVICE_ID_82597EX_SR,
  62         PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
  63        {PCI_VENDOR_ID_INTEL, IXGB_DEVICE_ID_82597EX_LR,
  64         PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
  65
  66        /* required last entry */
  67        {0,}
  68};
  69
  70MODULE_DEVICE_TABLE(pci, ixgb_pci_tbl);
  71
  72/* Local Function Prototypes */
  73static int ixgb_init_module(void);
  74static void ixgb_exit_module(void);
  75static int ixgb_probe(struct pci_dev *pdev, const struct pci_device_id *ent);
  76static void ixgb_remove(struct pci_dev *pdev);
  77static int ixgb_sw_init(struct ixgb_adapter *adapter);
  78static int ixgb_open(struct net_device *netdev);
  79static int ixgb_close(struct net_device *netdev);
  80static void ixgb_configure_tx(struct ixgb_adapter *adapter);
  81static void ixgb_configure_rx(struct ixgb_adapter *adapter);
  82static void ixgb_setup_rctl(struct ixgb_adapter *adapter);
  83static void ixgb_clean_tx_ring(struct ixgb_adapter *adapter);
  84static void ixgb_clean_rx_ring(struct ixgb_adapter *adapter);
  85static void ixgb_set_multi(struct net_device *netdev);
  86static void ixgb_watchdog(unsigned long data);
  87static netdev_tx_t ixgb_xmit_frame(struct sk_buff *skb,
  88                                   struct net_device *netdev);
  89static struct net_device_stats *ixgb_get_stats(struct net_device *netdev);
  90static int ixgb_change_mtu(struct net_device *netdev, int new_mtu);
  91static int ixgb_set_mac(struct net_device *netdev, void *p);
  92static irqreturn_t ixgb_intr(int irq, void *data);
  93static bool ixgb_clean_tx_irq(struct ixgb_adapter *adapter);
  94
  95static int ixgb_clean(struct napi_struct *, int);
  96static bool ixgb_clean_rx_irq(struct ixgb_adapter *, int *, int);
  97static void ixgb_alloc_rx_buffers(struct ixgb_adapter *, int);
  98
  99static void ixgb_tx_timeout(struct net_device *dev);
 100static void ixgb_tx_timeout_task(struct work_struct *work);
 101
 102static void ixgb_vlan_strip_enable(struct ixgb_adapter *adapter);
 103static void ixgb_vlan_strip_disable(struct ixgb_adapter *adapter);
 104static int ixgb_vlan_rx_add_vid(struct net_device *netdev,
 105                                __be16 proto, u16 vid);
 106static int ixgb_vlan_rx_kill_vid(struct net_device *netdev,
 107                                 __be16 proto, u16 vid);
 108static void ixgb_restore_vlan(struct ixgb_adapter *adapter);
 109
 110#ifdef CONFIG_NET_POLL_CONTROLLER
 111/* for netdump / net console */
 112static void ixgb_netpoll(struct net_device *dev);
 113#endif
 114
 115static pci_ers_result_t ixgb_io_error_detected (struct pci_dev *pdev,
 116                             enum pci_channel_state state);
 117static pci_ers_result_t ixgb_io_slot_reset (struct pci_dev *pdev);
 118static void ixgb_io_resume (struct pci_dev *pdev);
 119
 120static const struct pci_error_handlers ixgb_err_handler = {
 121        .error_detected = ixgb_io_error_detected,
 122        .slot_reset = ixgb_io_slot_reset,
 123        .resume = ixgb_io_resume,
 124};
 125
 126static struct pci_driver ixgb_driver = {
 127        .name     = ixgb_driver_name,
 128        .id_table = ixgb_pci_tbl,
 129        .probe    = ixgb_probe,
 130        .remove   = ixgb_remove,
 131        .err_handler = &ixgb_err_handler
 132};
 133
 134MODULE_AUTHOR("Intel Corporation, <linux.nics@intel.com>");
 135MODULE_DESCRIPTION("Intel(R) PRO/10GbE Network Driver");
 136MODULE_LICENSE("GPL");
 137MODULE_VERSION(DRV_VERSION);
 138
 139#define DEFAULT_MSG_ENABLE (NETIF_MSG_DRV|NETIF_MSG_PROBE|NETIF_MSG_LINK)
 140static int debug = -1;
 141module_param(debug, int, 0);
 142MODULE_PARM_DESC(debug, "Debug level (0=none,...,16=all)");
 143
 144/**
 145 * ixgb_init_module - Driver Registration Routine
 146 *
 147 * ixgb_init_module is the first routine called when the driver is
 148 * loaded. All it does is register with the PCI subsystem.
 149 **/
 150
 151static int __init
 152ixgb_init_module(void)
 153{
 154        pr_info("%s - version %s\n", ixgb_driver_string, ixgb_driver_version);
 155        pr_info("%s\n", ixgb_copyright);
 156
 157        return pci_register_driver(&ixgb_driver);
 158}
 159
 160module_init(ixgb_init_module);
 161
 162/**
 163 * ixgb_exit_module - Driver Exit Cleanup Routine
 164 *
 165 * ixgb_exit_module is called just before the driver is removed
 166 * from memory.
 167 **/
 168
 169static void __exit
 170ixgb_exit_module(void)
 171{
 172        pci_unregister_driver(&ixgb_driver);
 173}
 174
 175module_exit(ixgb_exit_module);
 176
 177/**
 178 * ixgb_irq_disable - Mask off interrupt generation on the NIC
 179 * @adapter: board private structure
 180 **/
 181
 182static void
 183ixgb_irq_disable(struct ixgb_adapter *adapter)
 184{
 185        IXGB_WRITE_REG(&adapter->hw, IMC, ~0);
 186        IXGB_WRITE_FLUSH(&adapter->hw);
 187        synchronize_irq(adapter->pdev->irq);
 188}
 189
 190/**
 191 * ixgb_irq_enable - Enable default interrupt generation settings
 192 * @adapter: board private structure
 193 **/
 194
 195static void
 196ixgb_irq_enable(struct ixgb_adapter *adapter)
 197{
 198        u32 val = IXGB_INT_RXT0 | IXGB_INT_RXDMT0 |
 199                  IXGB_INT_TXDW | IXGB_INT_LSC;
 200        if (adapter->hw.subsystem_vendor_id == PCI_VENDOR_ID_SUN)
 201                val |= IXGB_INT_GPI0;
 202        IXGB_WRITE_REG(&adapter->hw, IMS, val);
 203        IXGB_WRITE_FLUSH(&adapter->hw);
 204}
 205
 206int
 207ixgb_up(struct ixgb_adapter *adapter)
 208{
 209        struct net_device *netdev = adapter->netdev;
 210        int err, irq_flags = IRQF_SHARED;
 211        int max_frame = netdev->mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;
 212        struct ixgb_hw *hw = &adapter->hw;
 213
 214        /* hardware has been reset, we need to reload some things */
 215
 216        ixgb_rar_set(hw, netdev->dev_addr, 0);
 217        ixgb_set_multi(netdev);
 218
 219        ixgb_restore_vlan(adapter);
 220
 221        ixgb_configure_tx(adapter);
 222        ixgb_setup_rctl(adapter);
 223        ixgb_configure_rx(adapter);
 224        ixgb_alloc_rx_buffers(adapter, IXGB_DESC_UNUSED(&adapter->rx_ring));
 225
 226        /* disable interrupts and get the hardware into a known state */
 227        IXGB_WRITE_REG(&adapter->hw, IMC, 0xffffffff);
 228
 229        /* only enable MSI if bus is in PCI-X mode */
 230        if (IXGB_READ_REG(&adapter->hw, STATUS) & IXGB_STATUS_PCIX_MODE) {
 231                err = pci_enable_msi(adapter->pdev);
 232                if (!err) {
 233                        adapter->have_msi = true;
 234                        irq_flags = 0;
 235                }
 236                /* proceed to try to request regular interrupt */
 237        }
 238
 239        err = request_irq(adapter->pdev->irq, ixgb_intr, irq_flags,
 240                          netdev->name, netdev);
 241        if (err) {
 242                if (adapter->have_msi)
 243                        pci_disable_msi(adapter->pdev);
 244                netif_err(adapter, probe, adapter->netdev,
 245                          "Unable to allocate interrupt Error: %d\n", err);
 246                return err;
 247        }
 248
 249        if ((hw->max_frame_size != max_frame) ||
 250                (hw->max_frame_size !=
 251                (IXGB_READ_REG(hw, MFS) >> IXGB_MFS_SHIFT))) {
 252
 253                hw->max_frame_size = max_frame;
 254
 255                IXGB_WRITE_REG(hw, MFS, hw->max_frame_size << IXGB_MFS_SHIFT);
 256
 257                if (hw->max_frame_size >
 258                   IXGB_MAX_ENET_FRAME_SIZE_WITHOUT_FCS + ENET_FCS_LENGTH) {
 259                        u32 ctrl0 = IXGB_READ_REG(hw, CTRL0);
 260
 261                        if (!(ctrl0 & IXGB_CTRL0_JFE)) {
 262                                ctrl0 |= IXGB_CTRL0_JFE;
 263                                IXGB_WRITE_REG(hw, CTRL0, ctrl0);
 264                        }
 265                }
 266        }
 267
 268        clear_bit(__IXGB_DOWN, &adapter->flags);
 269
 270        napi_enable(&adapter->napi);
 271        ixgb_irq_enable(adapter);
 272
 273        netif_wake_queue(netdev);
 274
 275        mod_timer(&adapter->watchdog_timer, jiffies);
 276
 277        return 0;
 278}
 279
 280void
 281ixgb_down(struct ixgb_adapter *adapter, bool kill_watchdog)
 282{
 283        struct net_device *netdev = adapter->netdev;
 284
 285        /* prevent the interrupt handler from restarting watchdog */
 286        set_bit(__IXGB_DOWN, &adapter->flags);
 287
 288        napi_disable(&adapter->napi);
 289        /* waiting for NAPI to complete can re-enable interrupts */
 290        ixgb_irq_disable(adapter);
 291        free_irq(adapter->pdev->irq, netdev);
 292
 293        if (adapter->have_msi)
 294                pci_disable_msi(adapter->pdev);
 295
 296        if (kill_watchdog)
 297                del_timer_sync(&adapter->watchdog_timer);
 298
 299        adapter->link_speed = 0;
 300        adapter->link_duplex = 0;
 301        netif_carrier_off(netdev);
 302        netif_stop_queue(netdev);
 303
 304        ixgb_reset(adapter);
 305        ixgb_clean_tx_ring(adapter);
 306        ixgb_clean_rx_ring(adapter);
 307}
 308
 309void
 310ixgb_reset(struct ixgb_adapter *adapter)
 311{
 312        struct ixgb_hw *hw = &adapter->hw;
 313
 314        ixgb_adapter_stop(hw);
 315        if (!ixgb_init_hw(hw))
 316                netif_err(adapter, probe, adapter->netdev, "ixgb_init_hw failed\n");
 317
 318        /* restore frame size information */
 319        IXGB_WRITE_REG(hw, MFS, hw->max_frame_size << IXGB_MFS_SHIFT);
 320        if (hw->max_frame_size >
 321            IXGB_MAX_ENET_FRAME_SIZE_WITHOUT_FCS + ENET_FCS_LENGTH) {
 322                u32 ctrl0 = IXGB_READ_REG(hw, CTRL0);
 323                if (!(ctrl0 & IXGB_CTRL0_JFE)) {
 324                        ctrl0 |= IXGB_CTRL0_JFE;
 325                        IXGB_WRITE_REG(hw, CTRL0, ctrl0);
 326                }
 327        }
 328}
 329
 330static netdev_features_t
 331ixgb_fix_features(struct net_device *netdev, netdev_features_t features)
 332{
 333        /*
 334         * Tx VLAN insertion does not work per HW design when Rx stripping is
 335         * disabled.
 336         */
 337        if (!(features & NETIF_F_HW_VLAN_CTAG_RX))
 338                features &= ~NETIF_F_HW_VLAN_CTAG_TX;
 339
 340        return features;
 341}
 342
 343static int
 344ixgb_set_features(struct net_device *netdev, netdev_features_t features)
 345{
 346        struct ixgb_adapter *adapter = netdev_priv(netdev);
 347        netdev_features_t changed = features ^ netdev->features;
 348
 349        if (!(changed & (NETIF_F_RXCSUM|NETIF_F_HW_VLAN_CTAG_RX)))
 350                return 0;
 351
 352        adapter->rx_csum = !!(features & NETIF_F_RXCSUM);
 353
 354        if (netif_running(netdev)) {
 355                ixgb_down(adapter, true);
 356                ixgb_up(adapter);
 357                ixgb_set_speed_duplex(netdev);
 358        } else
 359                ixgb_reset(adapter);
 360
 361        return 0;
 362}
 363
 364
 365static const struct net_device_ops ixgb_netdev_ops = {
 366        .ndo_open               = ixgb_open,
 367        .ndo_stop               = ixgb_close,
 368        .ndo_start_xmit         = ixgb_xmit_frame,
 369        .ndo_get_stats          = ixgb_get_stats,
 370        .ndo_set_rx_mode        = ixgb_set_multi,
 371        .ndo_validate_addr      = eth_validate_addr,
 372        .ndo_set_mac_address    = ixgb_set_mac,
 373        .ndo_change_mtu         = ixgb_change_mtu,
 374        .ndo_tx_timeout         = ixgb_tx_timeout,
 375        .ndo_vlan_rx_add_vid    = ixgb_vlan_rx_add_vid,
 376        .ndo_vlan_rx_kill_vid   = ixgb_vlan_rx_kill_vid,
 377#ifdef CONFIG_NET_POLL_CONTROLLER
 378        .ndo_poll_controller    = ixgb_netpoll,
 379#endif
 380        .ndo_fix_features       = ixgb_fix_features,
 381        .ndo_set_features       = ixgb_set_features,
 382};
 383
 384/**
 385 * ixgb_probe - Device Initialization Routine
 386 * @pdev: PCI device information struct
 387 * @ent: entry in ixgb_pci_tbl
 388 *
 389 * Returns 0 on success, negative on failure
 390 *
 391 * ixgb_probe initializes an adapter identified by a pci_dev structure.
 392 * The OS initialization, configuring of the adapter private structure,
 393 * and a hardware reset occur.
 394 **/
 395
 396static int
 397ixgb_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
 398{
 399        struct net_device *netdev = NULL;
 400        struct ixgb_adapter *adapter;
 401        static int cards_found = 0;
 402        int pci_using_dac;
 403        int i;
 404        int err;
 405
 406        err = pci_enable_device(pdev);
 407        if (err)
 408                return err;
 409
 410        pci_using_dac = 0;
 411        err = dma_set_mask(&pdev->dev, DMA_BIT_MASK(64));
 412        if (!err) {
 413                err = dma_set_coherent_mask(&pdev->dev, DMA_BIT_MASK(64));
 414                if (!err)
 415                        pci_using_dac = 1;
 416        } else {
 417                err = dma_set_mask(&pdev->dev, DMA_BIT_MASK(32));
 418                if (err) {
 419                        err = dma_set_coherent_mask(&pdev->dev,
 420                                                    DMA_BIT_MASK(32));
 421                        if (err) {
 422                                pr_err("No usable DMA configuration, aborting\n");
 423                                goto err_dma_mask;
 424                        }
 425                }
 426        }
 427
 428        err = pci_request_regions(pdev, ixgb_driver_name);
 429        if (err)
 430                goto err_request_regions;
 431
 432        pci_set_master(pdev);
 433
 434        netdev = alloc_etherdev(sizeof(struct ixgb_adapter));
 435        if (!netdev) {
 436                err = -ENOMEM;
 437                goto err_alloc_etherdev;
 438        }
 439
 440        SET_NETDEV_DEV(netdev, &pdev->dev);
 441
 442        pci_set_drvdata(pdev, netdev);
 443        adapter = netdev_priv(netdev);
 444        adapter->netdev = netdev;
 445        adapter->pdev = pdev;
 446        adapter->hw.back = adapter;
 447        adapter->msg_enable = netif_msg_init(debug, DEFAULT_MSG_ENABLE);
 448
 449        adapter->hw.hw_addr = pci_ioremap_bar(pdev, BAR_0);
 450        if (!adapter->hw.hw_addr) {
 451                err = -EIO;
 452                goto err_ioremap;
 453        }
 454
 455        for (i = BAR_1; i <= BAR_5; i++) {
 456                if (pci_resource_len(pdev, i) == 0)
 457                        continue;
 458                if (pci_resource_flags(pdev, i) & IORESOURCE_IO) {
 459                        adapter->hw.io_base = pci_resource_start(pdev, i);
 460                        break;
 461                }
 462        }
 463
 464        netdev->netdev_ops = &ixgb_netdev_ops;
 465        ixgb_set_ethtool_ops(netdev);
 466        netdev->watchdog_timeo = 5 * HZ;
 467        netif_napi_add(netdev, &adapter->napi, ixgb_clean, 64);
 468
 469        strncpy(netdev->name, pci_name(pdev), sizeof(netdev->name) - 1);
 470
 471        adapter->bd_number = cards_found;
 472        adapter->link_speed = 0;
 473        adapter->link_duplex = 0;
 474
 475        /* setup the private structure */
 476
 477        err = ixgb_sw_init(adapter);
 478        if (err)
 479                goto err_sw_init;
 480
 481        netdev->hw_features = NETIF_F_SG |
 482                           NETIF_F_TSO |
 483                           NETIF_F_HW_CSUM |
 484                           NETIF_F_HW_VLAN_CTAG_TX |
 485                           NETIF_F_HW_VLAN_CTAG_RX;
 486        netdev->features = netdev->hw_features |
 487                           NETIF_F_HW_VLAN_CTAG_FILTER;
 488        netdev->hw_features |= NETIF_F_RXCSUM;
 489
 490        if (pci_using_dac) {
 491                netdev->features |= NETIF_F_HIGHDMA;
 492                netdev->vlan_features |= NETIF_F_HIGHDMA;
 493        }
 494
 495        /* make sure the EEPROM is good */
 496
 497        if (!ixgb_validate_eeprom_checksum(&adapter->hw)) {
 498                netif_err(adapter, probe, adapter->netdev,
 499                          "The EEPROM Checksum Is Not Valid\n");
 500                err = -EIO;
 501                goto err_eeprom;
 502        }
 503
 504        ixgb_get_ee_mac_addr(&adapter->hw, netdev->dev_addr);
 505
 506        if (!is_valid_ether_addr(netdev->dev_addr)) {
 507                netif_err(adapter, probe, adapter->netdev, "Invalid MAC Address\n");
 508                err = -EIO;
 509                goto err_eeprom;
 510        }
 511
 512        adapter->part_num = ixgb_get_ee_pba_number(&adapter->hw);
 513
 514        init_timer(&adapter->watchdog_timer);
 515        adapter->watchdog_timer.function = ixgb_watchdog;
 516        adapter->watchdog_timer.data = (unsigned long)adapter;
 517
 518        INIT_WORK(&adapter->tx_timeout_task, ixgb_tx_timeout_task);
 519
 520        strcpy(netdev->name, "eth%d");
 521        err = register_netdev(netdev);
 522        if (err)
 523                goto err_register;
 524
 525        /* carrier off reporting is important to ethtool even BEFORE open */
 526        netif_carrier_off(netdev);
 527
 528        netif_info(adapter, probe, adapter->netdev,
 529                   "Intel(R) PRO/10GbE Network Connection\n");
 530        ixgb_check_options(adapter);
 531        /* reset the hardware with the new settings */
 532
 533        ixgb_reset(adapter);
 534
 535        cards_found++;
 536        return 0;
 537
 538err_register:
 539err_sw_init:
 540err_eeprom:
 541        iounmap(adapter->hw.hw_addr);
 542err_ioremap:
 543        free_netdev(netdev);
 544err_alloc_etherdev:
 545        pci_release_regions(pdev);
 546err_request_regions:
 547err_dma_mask:
 548        pci_disable_device(pdev);
 549        return err;
 550}
 551
 552/**
 553 * ixgb_remove - Device Removal Routine
 554 * @pdev: PCI device information struct
 555 *
 556 * ixgb_remove is called by the PCI subsystem to alert the driver
 557 * that it should release a PCI device.  The could be caused by a
 558 * Hot-Plug event, or because the driver is going to be removed from
 559 * memory.
 560 **/
 561
 562static void
 563ixgb_remove(struct pci_dev *pdev)
 564{
 565        struct net_device *netdev = pci_get_drvdata(pdev);
 566        struct ixgb_adapter *adapter = netdev_priv(netdev);
 567
 568        cancel_work_sync(&adapter->tx_timeout_task);
 569
 570        unregister_netdev(netdev);
 571
 572        iounmap(adapter->hw.hw_addr);
 573        pci_release_regions(pdev);
 574
 575        free_netdev(netdev);
 576        pci_disable_device(pdev);
 577}
 578
 579/**
 580 * ixgb_sw_init - Initialize general software structures (struct ixgb_adapter)
 581 * @adapter: board private structure to initialize
 582 *
 583 * ixgb_sw_init initializes the Adapter private data structure.
 584 * Fields are initialized based on PCI device information and
 585 * OS network device settings (MTU size).
 586 **/
 587
 588static int
 589ixgb_sw_init(struct ixgb_adapter *adapter)
 590{
 591        struct ixgb_hw *hw = &adapter->hw;
 592        struct net_device *netdev = adapter->netdev;
 593        struct pci_dev *pdev = adapter->pdev;
 594
 595        /* PCI config space info */
 596
 597        hw->vendor_id = pdev->vendor;
 598        hw->device_id = pdev->device;
 599        hw->subsystem_vendor_id = pdev->subsystem_vendor;
 600        hw->subsystem_id = pdev->subsystem_device;
 601
 602        hw->max_frame_size = netdev->mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;
 603        adapter->rx_buffer_len = hw->max_frame_size + 8; /* + 8 for errata */
 604
 605        if ((hw->device_id == IXGB_DEVICE_ID_82597EX) ||
 606            (hw->device_id == IXGB_DEVICE_ID_82597EX_CX4) ||
 607            (hw->device_id == IXGB_DEVICE_ID_82597EX_LR) ||
 608            (hw->device_id == IXGB_DEVICE_ID_82597EX_SR))
 609                hw->mac_type = ixgb_82597;
 610        else {
 611                /* should never have loaded on this device */
 612                netif_err(adapter, probe, adapter->netdev, "unsupported device id\n");
 613        }
 614
 615        /* enable flow control to be programmed */
 616        hw->fc.send_xon = 1;
 617
 618        set_bit(__IXGB_DOWN, &adapter->flags);
 619        return 0;
 620}
 621
 622/**
 623 * ixgb_open - Called when a network interface is made active
 624 * @netdev: network interface device structure
 625 *
 626 * Returns 0 on success, negative value on failure
 627 *
 628 * The open entry point is called when a network interface is made
 629 * active by the system (IFF_UP).  At this point all resources needed
 630 * for transmit and receive operations are allocated, the interrupt
 631 * handler is registered with the OS, the watchdog timer is started,
 632 * and the stack is notified that the interface is ready.
 633 **/
 634
 635static int
 636ixgb_open(struct net_device *netdev)
 637{
 638        struct ixgb_adapter *adapter = netdev_priv(netdev);
 639        int err;
 640
 641        /* allocate transmit descriptors */
 642        err = ixgb_setup_tx_resources(adapter);
 643        if (err)
 644                goto err_setup_tx;
 645
 646        netif_carrier_off(netdev);
 647
 648        /* allocate receive descriptors */
 649
 650        err = ixgb_setup_rx_resources(adapter);
 651        if (err)
 652                goto err_setup_rx;
 653
 654        err = ixgb_up(adapter);
 655        if (err)
 656                goto err_up;
 657
 658        netif_start_queue(netdev);
 659
 660        return 0;
 661
 662err_up:
 663        ixgb_free_rx_resources(adapter);
 664err_setup_rx:
 665        ixgb_free_tx_resources(adapter);
 666err_setup_tx:
 667        ixgb_reset(adapter);
 668
 669        return err;
 670}
 671
 672/**
 673 * ixgb_close - Disables a network interface
 674 * @netdev: network interface device structure
 675 *
 676 * Returns 0, this is not allowed to fail
 677 *
 678 * The close entry point is called when an interface is de-activated
 679 * by the OS.  The hardware is still under the drivers control, but
 680 * needs to be disabled.  A global MAC reset is issued to stop the
 681 * hardware, and all transmit and receive resources are freed.
 682 **/
 683
 684static int
 685ixgb_close(struct net_device *netdev)
 686{
 687        struct ixgb_adapter *adapter = netdev_priv(netdev);
 688
 689        ixgb_down(adapter, true);
 690
 691        ixgb_free_tx_resources(adapter);
 692        ixgb_free_rx_resources(adapter);
 693
 694        return 0;
 695}
 696
 697/**
 698 * ixgb_setup_tx_resources - allocate Tx resources (Descriptors)
 699 * @adapter: board private structure
 700 *
 701 * Return 0 on success, negative on failure
 702 **/
 703
 704int
 705ixgb_setup_tx_resources(struct ixgb_adapter *adapter)
 706{
 707        struct ixgb_desc_ring *txdr = &adapter->tx_ring;
 708        struct pci_dev *pdev = adapter->pdev;
 709        int size;
 710
 711        size = sizeof(struct ixgb_buffer) * txdr->count;
 712        txdr->buffer_info = vzalloc(size);
 713        if (!txdr->buffer_info)
 714                return -ENOMEM;
 715
 716        /* round up to nearest 4K */
 717
 718        txdr->size = txdr->count * sizeof(struct ixgb_tx_desc);
 719        txdr->size = ALIGN(txdr->size, 4096);
 720
 721        txdr->desc = dma_alloc_coherent(&pdev->dev, txdr->size, &txdr->dma,
 722                                        GFP_KERNEL | __GFP_ZERO);
 723        if (!txdr->desc) {
 724                vfree(txdr->buffer_info);
 725                return -ENOMEM;
 726        }
 727
 728        txdr->next_to_use = 0;
 729        txdr->next_to_clean = 0;
 730
 731        return 0;
 732}
 733
 734/**
 735 * ixgb_configure_tx - Configure 82597 Transmit Unit after Reset.
 736 * @adapter: board private structure
 737 *
 738 * Configure the Tx unit of the MAC after a reset.
 739 **/
 740
 741static void
 742ixgb_configure_tx(struct ixgb_adapter *adapter)
 743{
 744        u64 tdba = adapter->tx_ring.dma;
 745        u32 tdlen = adapter->tx_ring.count * sizeof(struct ixgb_tx_desc);
 746        u32 tctl;
 747        struct ixgb_hw *hw = &adapter->hw;
 748
 749        /* Setup the Base and Length of the Tx Descriptor Ring
 750         * tx_ring.dma can be either a 32 or 64 bit value
 751         */
 752
 753        IXGB_WRITE_REG(hw, TDBAL, (tdba & 0x00000000ffffffffULL));
 754        IXGB_WRITE_REG(hw, TDBAH, (tdba >> 32));
 755
 756        IXGB_WRITE_REG(hw, TDLEN, tdlen);
 757
 758        /* Setup the HW Tx Head and Tail descriptor pointers */
 759
 760        IXGB_WRITE_REG(hw, TDH, 0);
 761        IXGB_WRITE_REG(hw, TDT, 0);
 762
 763        /* don't set up txdctl, it induces performance problems if configured
 764         * incorrectly */
 765        /* Set the Tx Interrupt Delay register */
 766
 767        IXGB_WRITE_REG(hw, TIDV, adapter->tx_int_delay);
 768
 769        /* Program the Transmit Control Register */
 770
 771        tctl = IXGB_TCTL_TCE | IXGB_TCTL_TXEN | IXGB_TCTL_TPDE;
 772        IXGB_WRITE_REG(hw, TCTL, tctl);
 773
 774        /* Setup Transmit Descriptor Settings for this adapter */
 775        adapter->tx_cmd_type =
 776                IXGB_TX_DESC_TYPE |
 777                (adapter->tx_int_delay_enable ? IXGB_TX_DESC_CMD_IDE : 0);
 778}
 779
 780/**
 781 * ixgb_setup_rx_resources - allocate Rx resources (Descriptors)
 782 * @adapter: board private structure
 783 *
 784 * Returns 0 on success, negative on failure
 785 **/
 786
 787int
 788ixgb_setup_rx_resources(struct ixgb_adapter *adapter)
 789{
 790        struct ixgb_desc_ring *rxdr = &adapter->rx_ring;
 791        struct pci_dev *pdev = adapter->pdev;
 792        int size;
 793
 794        size = sizeof(struct ixgb_buffer) * rxdr->count;
 795        rxdr->buffer_info = vzalloc(size);
 796        if (!rxdr->buffer_info)
 797                return -ENOMEM;
 798
 799        /* Round up to nearest 4K */
 800
 801        rxdr->size = rxdr->count * sizeof(struct ixgb_rx_desc);
 802        rxdr->size = ALIGN(rxdr->size, 4096);
 803
 804        rxdr->desc = dma_alloc_coherent(&pdev->dev, rxdr->size, &rxdr->dma,
 805                                        GFP_KERNEL);
 806
 807        if (!rxdr->desc) {
 808                vfree(rxdr->buffer_info);
 809                return -ENOMEM;
 810        }
 811        memset(rxdr->desc, 0, rxdr->size);
 812
 813        rxdr->next_to_clean = 0;
 814        rxdr->next_to_use = 0;
 815
 816        return 0;
 817}
 818
 819/**
 820 * ixgb_setup_rctl - configure the receive control register
 821 * @adapter: Board private structure
 822 **/
 823
 824static void
 825ixgb_setup_rctl(struct ixgb_adapter *adapter)
 826{
 827        u32 rctl;
 828
 829        rctl = IXGB_READ_REG(&adapter->hw, RCTL);
 830
 831        rctl &= ~(3 << IXGB_RCTL_MO_SHIFT);
 832
 833        rctl |=
 834                IXGB_RCTL_BAM | IXGB_RCTL_RDMTS_1_2 |
 835                IXGB_RCTL_RXEN | IXGB_RCTL_CFF |
 836                (adapter->hw.mc_filter_type << IXGB_RCTL_MO_SHIFT);
 837
 838        rctl |= IXGB_RCTL_SECRC;
 839
 840        if (adapter->rx_buffer_len <= IXGB_RXBUFFER_2048)
 841                rctl |= IXGB_RCTL_BSIZE_2048;
 842        else if (adapter->rx_buffer_len <= IXGB_RXBUFFER_4096)
 843                rctl |= IXGB_RCTL_BSIZE_4096;
 844        else if (adapter->rx_buffer_len <= IXGB_RXBUFFER_8192)
 845                rctl |= IXGB_RCTL_BSIZE_8192;
 846        else if (adapter->rx_buffer_len <= IXGB_RXBUFFER_16384)
 847                rctl |= IXGB_RCTL_BSIZE_16384;
 848
 849        IXGB_WRITE_REG(&adapter->hw, RCTL, rctl);
 850}
 851
 852/**
 853 * ixgb_configure_rx - Configure 82597 Receive Unit after Reset.
 854 * @adapter: board private structure
 855 *
 856 * Configure the Rx unit of the MAC after a reset.
 857 **/
 858
 859static void
 860ixgb_configure_rx(struct ixgb_adapter *adapter)
 861{
 862        u64 rdba = adapter->rx_ring.dma;
 863        u32 rdlen = adapter->rx_ring.count * sizeof(struct ixgb_rx_desc);
 864        struct ixgb_hw *hw = &adapter->hw;
 865        u32 rctl;
 866        u32 rxcsum;
 867
 868        /* make sure receives are disabled while setting up the descriptors */
 869
 870        rctl = IXGB_READ_REG(hw, RCTL);
 871        IXGB_WRITE_REG(hw, RCTL, rctl & ~IXGB_RCTL_RXEN);
 872
 873        /* set the Receive Delay Timer Register */
 874
 875        IXGB_WRITE_REG(hw, RDTR, adapter->rx_int_delay);
 876
 877        /* Setup the Base and Length of the Rx Descriptor Ring */
 878
 879        IXGB_WRITE_REG(hw, RDBAL, (rdba & 0x00000000ffffffffULL));
 880        IXGB_WRITE_REG(hw, RDBAH, (rdba >> 32));
 881
 882        IXGB_WRITE_REG(hw, RDLEN, rdlen);
 883
 884        /* Setup the HW Rx Head and Tail Descriptor Pointers */
 885        IXGB_WRITE_REG(hw, RDH, 0);
 886        IXGB_WRITE_REG(hw, RDT, 0);
 887
 888        /* due to the hardware errata with RXDCTL, we are unable to use any of
 889         * the performance enhancing features of it without causing other
 890         * subtle bugs, some of the bugs could include receive length
 891         * corruption at high data rates (WTHRESH > 0) and/or receive
 892         * descriptor ring irregularites (particularly in hardware cache) */
 893        IXGB_WRITE_REG(hw, RXDCTL, 0);
 894
 895        /* Enable Receive Checksum Offload for TCP and UDP */
 896        if (adapter->rx_csum) {
 897                rxcsum = IXGB_READ_REG(hw, RXCSUM);
 898                rxcsum |= IXGB_RXCSUM_TUOFL;
 899                IXGB_WRITE_REG(hw, RXCSUM, rxcsum);
 900        }
 901
 902        /* Enable Receives */
 903
 904        IXGB_WRITE_REG(hw, RCTL, rctl);
 905}
 906
 907/**
 908 * ixgb_free_tx_resources - Free Tx Resources
 909 * @adapter: board private structure
 910 *
 911 * Free all transmit software resources
 912 **/
 913
 914void
 915ixgb_free_tx_resources(struct ixgb_adapter *adapter)
 916{
 917        struct pci_dev *pdev = adapter->pdev;
 918
 919        ixgb_clean_tx_ring(adapter);
 920
 921        vfree(adapter->tx_ring.buffer_info);
 922        adapter->tx_ring.buffer_info = NULL;
 923
 924        dma_free_coherent(&pdev->dev, adapter->tx_ring.size,
 925                          adapter->tx_ring.desc, adapter->tx_ring.dma);
 926
 927        adapter->tx_ring.desc = NULL;
 928}
 929
 930static void
 931ixgb_unmap_and_free_tx_resource(struct ixgb_adapter *adapter,
 932                                struct ixgb_buffer *buffer_info)
 933{
 934        if (buffer_info->dma) {
 935                if (buffer_info->mapped_as_page)
 936                        dma_unmap_page(&adapter->pdev->dev, buffer_info->dma,
 937                                       buffer_info->length, DMA_TO_DEVICE);
 938                else
 939                        dma_unmap_single(&adapter->pdev->dev, buffer_info->dma,
 940                                         buffer_info->length, DMA_TO_DEVICE);
 941                buffer_info->dma = 0;
 942        }
 943
 944        if (buffer_info->skb) {
 945                dev_kfree_skb_any(buffer_info->skb);
 946                buffer_info->skb = NULL;
 947        }
 948        buffer_info->time_stamp = 0;
 949        /* these fields must always be initialized in tx
 950         * buffer_info->length = 0;
 951         * buffer_info->next_to_watch = 0; */
 952}
 953
 954/**
 955 * ixgb_clean_tx_ring - Free Tx Buffers
 956 * @adapter: board private structure
 957 **/
 958
 959static void
 960ixgb_clean_tx_ring(struct ixgb_adapter *adapter)
 961{
 962        struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
 963        struct ixgb_buffer *buffer_info;
 964        unsigned long size;
 965        unsigned int i;
 966
 967        /* Free all the Tx ring sk_buffs */
 968
 969        for (i = 0; i < tx_ring->count; i++) {
 970                buffer_info = &tx_ring->buffer_info[i];
 971                ixgb_unmap_and_free_tx_resource(adapter, buffer_info);
 972        }
 973
 974        size = sizeof(struct ixgb_buffer) * tx_ring->count;
 975        memset(tx_ring->buffer_info, 0, size);
 976
 977        /* Zero out the descriptor ring */
 978
 979        memset(tx_ring->desc, 0, tx_ring->size);
 980
 981        tx_ring->next_to_use = 0;
 982        tx_ring->next_to_clean = 0;
 983
 984        IXGB_WRITE_REG(&adapter->hw, TDH, 0);
 985        IXGB_WRITE_REG(&adapter->hw, TDT, 0);
 986}
 987
 988/**
 989 * ixgb_free_rx_resources - Free Rx Resources
 990 * @adapter: board private structure
 991 *
 992 * Free all receive software resources
 993 **/
 994
 995void
 996ixgb_free_rx_resources(struct ixgb_adapter *adapter)
 997{
 998        struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
 999        struct pci_dev *pdev = adapter->pdev;
1000
1001        ixgb_clean_rx_ring(adapter);
1002
1003        vfree(rx_ring->buffer_info);
1004        rx_ring->buffer_info = NULL;
1005
1006        dma_free_coherent(&pdev->dev, rx_ring->size, rx_ring->desc,
1007                          rx_ring->dma);
1008
1009        rx_ring->desc = NULL;
1010}
1011
1012/**
1013 * ixgb_clean_rx_ring - Free Rx Buffers
1014 * @adapter: board private structure
1015 **/
1016
1017static void
1018ixgb_clean_rx_ring(struct ixgb_adapter *adapter)
1019{
1020        struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
1021        struct ixgb_buffer *buffer_info;
1022        struct pci_dev *pdev = adapter->pdev;
1023        unsigned long size;
1024        unsigned int i;
1025
1026        /* Free all the Rx ring sk_buffs */
1027
1028        for (i = 0; i < rx_ring->count; i++) {
1029                buffer_info = &rx_ring->buffer_info[i];
1030                if (buffer_info->dma) {
1031                        dma_unmap_single(&pdev->dev,
1032                                         buffer_info->dma,
1033                                         buffer_info->length,
1034                                         DMA_FROM_DEVICE);
1035                        buffer_info->dma = 0;
1036                        buffer_info->length = 0;
1037                }
1038
1039                if (buffer_info->skb) {
1040                        dev_kfree_skb(buffer_info->skb);
1041                        buffer_info->skb = NULL;
1042                }
1043        }
1044
1045        size = sizeof(struct ixgb_buffer) * rx_ring->count;
1046        memset(rx_ring->buffer_info, 0, size);
1047
1048        /* Zero out the descriptor ring */
1049
1050        memset(rx_ring->desc, 0, rx_ring->size);
1051
1052        rx_ring->next_to_clean = 0;
1053        rx_ring->next_to_use = 0;
1054
1055        IXGB_WRITE_REG(&adapter->hw, RDH, 0);
1056        IXGB_WRITE_REG(&adapter->hw, RDT, 0);
1057}
1058
1059/**
1060 * ixgb_set_mac - Change the Ethernet Address of the NIC
1061 * @netdev: network interface device structure
1062 * @p: pointer to an address structure
1063 *
1064 * Returns 0 on success, negative on failure
1065 **/
1066
1067static int
1068ixgb_set_mac(struct net_device *netdev, void *p)
1069{
1070        struct ixgb_adapter *adapter = netdev_priv(netdev);
1071        struct sockaddr *addr = p;
1072
1073        if (!is_valid_ether_addr(addr->sa_data))
1074                return -EADDRNOTAVAIL;
1075
1076        memcpy(netdev->dev_addr, addr->sa_data, netdev->addr_len);
1077
1078        ixgb_rar_set(&adapter->hw, addr->sa_data, 0);
1079
1080        return 0;
1081}
1082
1083/**
1084 * ixgb_set_multi - Multicast and Promiscuous mode set
1085 * @netdev: network interface device structure
1086 *
1087 * The set_multi entry point is called whenever the multicast address
1088 * list or the network interface flags are updated.  This routine is
1089 * responsible for configuring the hardware for proper multicast,
1090 * promiscuous mode, and all-multi behavior.
1091 **/
1092
1093static void
1094ixgb_set_multi(struct net_device *netdev)
1095{
1096        struct ixgb_adapter *adapter = netdev_priv(netdev);
1097        struct ixgb_hw *hw = &adapter->hw;
1098        struct netdev_hw_addr *ha;
1099        u32 rctl;
1100
1101        /* Check for Promiscuous and All Multicast modes */
1102
1103        rctl = IXGB_READ_REG(hw, RCTL);
1104
1105        if (netdev->flags & IFF_PROMISC) {
1106                rctl |= (IXGB_RCTL_UPE | IXGB_RCTL_MPE);
1107                /* disable VLAN filtering */
1108                rctl &= ~IXGB_RCTL_CFIEN;
1109                rctl &= ~IXGB_RCTL_VFE;
1110        } else {
1111                if (netdev->flags & IFF_ALLMULTI) {
1112                        rctl |= IXGB_RCTL_MPE;
1113                        rctl &= ~IXGB_RCTL_UPE;
1114                } else {
1115                        rctl &= ~(IXGB_RCTL_UPE | IXGB_RCTL_MPE);
1116                }
1117                /* enable VLAN filtering */
1118                rctl |= IXGB_RCTL_VFE;
1119                rctl &= ~IXGB_RCTL_CFIEN;
1120        }
1121
1122        if (netdev_mc_count(netdev) > IXGB_MAX_NUM_MULTICAST_ADDRESSES) {
1123                rctl |= IXGB_RCTL_MPE;
1124                IXGB_WRITE_REG(hw, RCTL, rctl);
1125        } else {
1126                u8 *mta = kmalloc(IXGB_MAX_NUM_MULTICAST_ADDRESSES *
1127                              ETH_ALEN, GFP_ATOMIC);
1128                u8 *addr;
1129                if (!mta)
1130                        goto alloc_failed;
1131
1132                IXGB_WRITE_REG(hw, RCTL, rctl);
1133
1134                addr = mta;
1135                netdev_for_each_mc_addr(ha, netdev) {
1136                        memcpy(addr, ha->addr, ETH_ALEN);
1137                        addr += ETH_ALEN;
1138                }
1139
1140                ixgb_mc_addr_list_update(hw, mta, netdev_mc_count(netdev), 0);
1141                kfree(mta);
1142        }
1143
1144alloc_failed:
1145        if (netdev->features & NETIF_F_HW_VLAN_CTAG_RX)
1146                ixgb_vlan_strip_enable(adapter);
1147        else
1148                ixgb_vlan_strip_disable(adapter);
1149
1150}
1151
1152/**
1153 * ixgb_watchdog - Timer Call-back
1154 * @data: pointer to netdev cast into an unsigned long
1155 **/
1156
1157static void
1158ixgb_watchdog(unsigned long data)
1159{
1160        struct ixgb_adapter *adapter = (struct ixgb_adapter *)data;
1161        struct net_device *netdev = adapter->netdev;
1162        struct ixgb_desc_ring *txdr = &adapter->tx_ring;
1163
1164        ixgb_check_for_link(&adapter->hw);
1165
1166        if (ixgb_check_for_bad_link(&adapter->hw)) {
1167                /* force the reset path */
1168                netif_stop_queue(netdev);
1169        }
1170
1171        if (adapter->hw.link_up) {
1172                if (!netif_carrier_ok(netdev)) {
1173                        netdev_info(netdev,
1174                                    "NIC Link is Up 10 Gbps Full Duplex, Flow Control: %s\n",
1175                                    (adapter->hw.fc.type == ixgb_fc_full) ?
1176                                    "RX/TX" :
1177                                    (adapter->hw.fc.type == ixgb_fc_rx_pause) ?
1178                                     "RX" :
1179                                    (adapter->hw.fc.type == ixgb_fc_tx_pause) ?
1180                                    "TX" : "None");
1181                        adapter->link_speed = 10000;
1182                        adapter->link_duplex = FULL_DUPLEX;
1183                        netif_carrier_on(netdev);
1184                }
1185        } else {
1186                if (netif_carrier_ok(netdev)) {
1187                        adapter->link_speed = 0;
1188                        adapter->link_duplex = 0;
1189                        netdev_info(netdev, "NIC Link is Down\n");
1190                        netif_carrier_off(netdev);
1191                }
1192        }
1193
1194        ixgb_update_stats(adapter);
1195
1196        if (!netif_carrier_ok(netdev)) {
1197                if (IXGB_DESC_UNUSED(txdr) + 1 < txdr->count) {
1198                        /* We've lost link, so the controller stops DMA,
1199                         * but we've got queued Tx work that's never going
1200                         * to get done, so reset controller to flush Tx.
1201                         * (Do the reset outside of interrupt context). */
1202                        schedule_work(&adapter->tx_timeout_task);
1203                        /* return immediately since reset is imminent */
1204                        return;
1205                }
1206        }
1207
1208        /* Force detection of hung controller every watchdog period */
1209        adapter->detect_tx_hung = true;
1210
1211        /* generate an interrupt to force clean up of any stragglers */
1212        IXGB_WRITE_REG(&adapter->hw, ICS, IXGB_INT_TXDW);
1213
1214        /* Reset the timer */
1215        mod_timer(&adapter->watchdog_timer, jiffies + 2 * HZ);
1216}
1217
1218#define IXGB_TX_FLAGS_CSUM              0x00000001
1219#define IXGB_TX_FLAGS_VLAN              0x00000002
1220#define IXGB_TX_FLAGS_TSO               0x00000004
1221
1222static int
1223ixgb_tso(struct ixgb_adapter *adapter, struct sk_buff *skb)
1224{
1225        struct ixgb_context_desc *context_desc;
1226        unsigned int i;
1227        u8 ipcss, ipcso, tucss, tucso, hdr_len;
1228        u16 ipcse, tucse, mss;
1229        int err;
1230
1231        if (likely(skb_is_gso(skb))) {
1232                struct ixgb_buffer *buffer_info;
1233                struct iphdr *iph;
1234
1235                if (skb_header_cloned(skb)) {
1236                        err = pskb_expand_head(skb, 0, 0, GFP_ATOMIC);
1237                        if (err)
1238                                return err;
1239                }
1240
1241                hdr_len = skb_transport_offset(skb) + tcp_hdrlen(skb);
1242                mss = skb_shinfo(skb)->gso_size;
1243                iph = ip_hdr(skb);
1244                iph->tot_len = 0;
1245                iph->check = 0;
1246                tcp_hdr(skb)->check = ~csum_tcpudp_magic(iph->saddr,
1247                                                         iph->daddr, 0,
1248                                                         IPPROTO_TCP, 0);
1249                ipcss = skb_network_offset(skb);
1250                ipcso = (void *)&(iph->check) - (void *)skb->data;
1251                ipcse = skb_transport_offset(skb) - 1;
1252                tucss = skb_transport_offset(skb);
1253                tucso = (void *)&(tcp_hdr(skb)->check) - (void *)skb->data;
1254                tucse = 0;
1255
1256                i = adapter->tx_ring.next_to_use;
1257                context_desc = IXGB_CONTEXT_DESC(adapter->tx_ring, i);
1258                buffer_info = &adapter->tx_ring.buffer_info[i];
1259                WARN_ON(buffer_info->dma != 0);
1260
1261                context_desc->ipcss = ipcss;
1262                context_desc->ipcso = ipcso;
1263                context_desc->ipcse = cpu_to_le16(ipcse);
1264                context_desc->tucss = tucss;
1265                context_desc->tucso = tucso;
1266                context_desc->tucse = cpu_to_le16(tucse);
1267                context_desc->mss = cpu_to_le16(mss);
1268                context_desc->hdr_len = hdr_len;
1269                context_desc->status = 0;
1270                context_desc->cmd_type_len = cpu_to_le32(
1271                                                  IXGB_CONTEXT_DESC_TYPE
1272                                                | IXGB_CONTEXT_DESC_CMD_TSE
1273                                                | IXGB_CONTEXT_DESC_CMD_IP
1274                                                | IXGB_CONTEXT_DESC_CMD_TCP
1275                                                | IXGB_CONTEXT_DESC_CMD_IDE
1276                                                | (skb->len - (hdr_len)));
1277
1278
1279                if (++i == adapter->tx_ring.count) i = 0;
1280                adapter->tx_ring.next_to_use = i;
1281
1282                return 1;
1283        }
1284
1285        return 0;
1286}
1287
1288static bool
1289ixgb_tx_csum(struct ixgb_adapter *adapter, struct sk_buff *skb)
1290{
1291        struct ixgb_context_desc *context_desc;
1292        unsigned int i;
1293        u8 css, cso;
1294
1295        if (likely(skb->ip_summed == CHECKSUM_PARTIAL)) {
1296                struct ixgb_buffer *buffer_info;
1297                css = skb_checksum_start_offset(skb);
1298                cso = css + skb->csum_offset;
1299
1300                i = adapter->tx_ring.next_to_use;
1301                context_desc = IXGB_CONTEXT_DESC(adapter->tx_ring, i);
1302                buffer_info = &adapter->tx_ring.buffer_info[i];
1303                WARN_ON(buffer_info->dma != 0);
1304
1305                context_desc->tucss = css;
1306                context_desc->tucso = cso;
1307                context_desc->tucse = 0;
1308                /* zero out any previously existing data in one instruction */
1309                *(u32 *)&(context_desc->ipcss) = 0;
1310                context_desc->status = 0;
1311                context_desc->hdr_len = 0;
1312                context_desc->mss = 0;
1313                context_desc->cmd_type_len =
1314                        cpu_to_le32(IXGB_CONTEXT_DESC_TYPE
1315                                    | IXGB_TX_DESC_CMD_IDE);
1316
1317                if (++i == adapter->tx_ring.count) i = 0;
1318                adapter->tx_ring.next_to_use = i;
1319
1320                return true;
1321        }
1322
1323        return false;
1324}
1325
1326#define IXGB_MAX_TXD_PWR        14
1327#define IXGB_MAX_DATA_PER_TXD   (1<<IXGB_MAX_TXD_PWR)
1328
1329static int
1330ixgb_tx_map(struct ixgb_adapter *adapter, struct sk_buff *skb,
1331            unsigned int first)
1332{
1333        struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
1334        struct pci_dev *pdev = adapter->pdev;
1335        struct ixgb_buffer *buffer_info;
1336        int len = skb_headlen(skb);
1337        unsigned int offset = 0, size, count = 0, i;
1338        unsigned int mss = skb_shinfo(skb)->gso_size;
1339        unsigned int nr_frags = skb_shinfo(skb)->nr_frags;
1340        unsigned int f;
1341
1342        i = tx_ring->next_to_use;
1343
1344        while (len) {
1345                buffer_info = &tx_ring->buffer_info[i];
1346                size = min(len, IXGB_MAX_DATA_PER_TXD);
1347                /* Workaround for premature desc write-backs
1348                 * in TSO mode.  Append 4-byte sentinel desc */
1349                if (unlikely(mss && !nr_frags && size == len && size > 8))
1350                        size -= 4;
1351
1352                buffer_info->length = size;
1353                WARN_ON(buffer_info->dma != 0);
1354                buffer_info->time_stamp = jiffies;
1355                buffer_info->mapped_as_page = false;
1356                buffer_info->dma = dma_map_single(&pdev->dev,
1357                                                  skb->data + offset,
1358                                                  size, DMA_TO_DEVICE);
1359                if (dma_mapping_error(&pdev->dev, buffer_info->dma))
1360                        goto dma_error;
1361                buffer_info->next_to_watch = 0;
1362
1363                len -= size;
1364                offset += size;
1365                count++;
1366                if (len) {
1367                        i++;
1368                        if (i == tx_ring->count)
1369                                i = 0;
1370                }
1371        }
1372
1373        for (f = 0; f < nr_frags; f++) {
1374                const struct skb_frag_struct *frag;
1375
1376                frag = &skb_shinfo(skb)->frags[f];
1377                len = skb_frag_size(frag);
1378                offset = 0;
1379
1380                while (len) {
1381                        i++;
1382                        if (i == tx_ring->count)
1383                                i = 0;
1384
1385                        buffer_info = &tx_ring->buffer_info[i];
1386                        size = min(len, IXGB_MAX_DATA_PER_TXD);
1387
1388                        /* Workaround for premature desc write-backs
1389                         * in TSO mode.  Append 4-byte sentinel desc */
1390                        if (unlikely(mss && (f == (nr_frags - 1))
1391                                     && size == len && size > 8))
1392                                size -= 4;
1393
1394                        buffer_info->length = size;
1395                        buffer_info->time_stamp = jiffies;
1396                        buffer_info->mapped_as_page = true;
1397                        buffer_info->dma =
1398                                skb_frag_dma_map(&pdev->dev, frag, offset, size,
1399                                                 DMA_TO_DEVICE);
1400                        if (dma_mapping_error(&pdev->dev, buffer_info->dma))
1401                                goto dma_error;
1402                        buffer_info->next_to_watch = 0;
1403
1404                        len -= size;
1405                        offset += size;
1406                        count++;
1407                }
1408        }
1409        tx_ring->buffer_info[i].skb = skb;
1410        tx_ring->buffer_info[first].next_to_watch = i;
1411
1412        return count;
1413
1414dma_error:
1415        dev_err(&pdev->dev, "TX DMA map failed\n");
1416        buffer_info->dma = 0;
1417        if (count)
1418                count--;
1419
1420        while (count--) {
1421                if (i==0)
1422                        i += tx_ring->count;
1423                i--;
1424                buffer_info = &tx_ring->buffer_info[i];
1425                ixgb_unmap_and_free_tx_resource(adapter, buffer_info);
1426        }
1427
1428        return 0;
1429}
1430
1431static void
1432ixgb_tx_queue(struct ixgb_adapter *adapter, int count, int vlan_id,int tx_flags)
1433{
1434        struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
1435        struct ixgb_tx_desc *tx_desc = NULL;
1436        struct ixgb_buffer *buffer_info;
1437        u32 cmd_type_len = adapter->tx_cmd_type;
1438        u8 status = 0;
1439        u8 popts = 0;
1440        unsigned int i;
1441
1442        if (tx_flags & IXGB_TX_FLAGS_TSO) {
1443                cmd_type_len |= IXGB_TX_DESC_CMD_TSE;
1444                popts |= (IXGB_TX_DESC_POPTS_IXSM | IXGB_TX_DESC_POPTS_TXSM);
1445        }
1446
1447        if (tx_flags & IXGB_TX_FLAGS_CSUM)
1448                popts |= IXGB_TX_DESC_POPTS_TXSM;
1449
1450        if (tx_flags & IXGB_TX_FLAGS_VLAN)
1451                cmd_type_len |= IXGB_TX_DESC_CMD_VLE;
1452
1453        i = tx_ring->next_to_use;
1454
1455        while (count--) {
1456                buffer_info = &tx_ring->buffer_info[i];
1457                tx_desc = IXGB_TX_DESC(*tx_ring, i);
1458                tx_desc->buff_addr = cpu_to_le64(buffer_info->dma);
1459                tx_desc->cmd_type_len =
1460                        cpu_to_le32(cmd_type_len | buffer_info->length);
1461                tx_desc->status = status;
1462                tx_desc->popts = popts;
1463                tx_desc->vlan = cpu_to_le16(vlan_id);
1464
1465                if (++i == tx_ring->count) i = 0;
1466        }
1467
1468        tx_desc->cmd_type_len |=
1469                cpu_to_le32(IXGB_TX_DESC_CMD_EOP | IXGB_TX_DESC_CMD_RS);
1470
1471        /* Force memory writes to complete before letting h/w
1472         * know there are new descriptors to fetch.  (Only
1473         * applicable for weak-ordered memory model archs,
1474         * such as IA-64). */
1475        wmb();
1476
1477        tx_ring->next_to_use = i;
1478        IXGB_WRITE_REG(&adapter->hw, TDT, i);
1479}
1480
1481static int __ixgb_maybe_stop_tx(struct net_device *netdev, int size)
1482{
1483        struct ixgb_adapter *adapter = netdev_priv(netdev);
1484        struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
1485
1486        netif_stop_queue(netdev);
1487        /* Herbert's original patch had:
1488         *  smp_mb__after_netif_stop_queue();
1489         * but since that doesn't exist yet, just open code it. */
1490        smp_mb();
1491
1492        /* We need to check again in a case another CPU has just
1493         * made room available. */
1494        if (likely(IXGB_DESC_UNUSED(tx_ring) < size))
1495                return -EBUSY;
1496
1497        /* A reprieve! */
1498        netif_start_queue(netdev);
1499        ++adapter->restart_queue;
1500        return 0;
1501}
1502
1503static int ixgb_maybe_stop_tx(struct net_device *netdev,
1504                              struct ixgb_desc_ring *tx_ring, int size)
1505{
1506        if (likely(IXGB_DESC_UNUSED(tx_ring) >= size))
1507                return 0;
1508        return __ixgb_maybe_stop_tx(netdev, size);
1509}
1510
1511
1512/* Tx Descriptors needed, worst case */
1513#define TXD_USE_COUNT(S) (((S) >> IXGB_MAX_TXD_PWR) + \
1514                         (((S) & (IXGB_MAX_DATA_PER_TXD - 1)) ? 1 : 0))
1515#define DESC_NEEDED TXD_USE_COUNT(IXGB_MAX_DATA_PER_TXD) /* skb->date */ + \
1516        MAX_SKB_FRAGS * TXD_USE_COUNT(PAGE_SIZE) + 1 /* for context */ \
1517        + 1 /* one more needed for sentinel TSO workaround */
1518
1519static netdev_tx_t
1520ixgb_xmit_frame(struct sk_buff *skb, struct net_device *netdev)
1521{
1522        struct ixgb_adapter *adapter = netdev_priv(netdev);
1523        unsigned int first;
1524        unsigned int tx_flags = 0;
1525        int vlan_id = 0;
1526        int count = 0;
1527        int tso;
1528
1529        if (test_bit(__IXGB_DOWN, &adapter->flags)) {
1530                dev_kfree_skb(skb);
1531                return NETDEV_TX_OK;
1532        }
1533
1534        if (skb->len <= 0) {
1535                dev_kfree_skb(skb);
1536                return NETDEV_TX_OK;
1537        }
1538
1539        if (unlikely(ixgb_maybe_stop_tx(netdev, &adapter->tx_ring,
1540                     DESC_NEEDED)))
1541                return NETDEV_TX_BUSY;
1542
1543        if (skb_vlan_tag_present(skb)) {
1544                tx_flags |= IXGB_TX_FLAGS_VLAN;
1545                vlan_id = skb_vlan_tag_get(skb);
1546        }
1547
1548        first = adapter->tx_ring.next_to_use;
1549
1550        tso = ixgb_tso(adapter, skb);
1551        if (tso < 0) {
1552                dev_kfree_skb(skb);
1553                return NETDEV_TX_OK;
1554        }
1555
1556        if (likely(tso))
1557                tx_flags |= IXGB_TX_FLAGS_TSO;
1558        else if (ixgb_tx_csum(adapter, skb))
1559                tx_flags |= IXGB_TX_FLAGS_CSUM;
1560
1561        count = ixgb_tx_map(adapter, skb, first);
1562
1563        if (count) {
1564                ixgb_tx_queue(adapter, count, vlan_id, tx_flags);
1565                /* Make sure there is space in the ring for the next send. */
1566                ixgb_maybe_stop_tx(netdev, &adapter->tx_ring, DESC_NEEDED);
1567
1568        } else {
1569                dev_kfree_skb_any(skb);
1570                adapter->tx_ring.buffer_info[first].time_stamp = 0;
1571                adapter->tx_ring.next_to_use = first;
1572        }
1573
1574        return NETDEV_TX_OK;
1575}
1576
1577/**
1578 * ixgb_tx_timeout - Respond to a Tx Hang
1579 * @netdev: network interface device structure
1580 **/
1581
1582static void
1583ixgb_tx_timeout(struct net_device *netdev)
1584{
1585        struct ixgb_adapter *adapter = netdev_priv(netdev);
1586
1587        /* Do the reset outside of interrupt context */
1588        schedule_work(&adapter->tx_timeout_task);
1589}
1590
1591static void
1592ixgb_tx_timeout_task(struct work_struct *work)
1593{
1594        struct ixgb_adapter *adapter =
1595                container_of(work, struct ixgb_adapter, tx_timeout_task);
1596
1597        adapter->tx_timeout_count++;
1598        ixgb_down(adapter, true);
1599        ixgb_up(adapter);
1600}
1601
1602/**
1603 * ixgb_get_stats - Get System Network Statistics
1604 * @netdev: network interface device structure
1605 *
1606 * Returns the address of the device statistics structure.
1607 * The statistics are actually updated from the timer callback.
1608 **/
1609
1610static struct net_device_stats *
1611ixgb_get_stats(struct net_device *netdev)
1612{
1613        return &netdev->stats;
1614}
1615
1616/**
1617 * ixgb_change_mtu - Change the Maximum Transfer Unit
1618 * @netdev: network interface device structure
1619 * @new_mtu: new value for maximum frame size
1620 *
1621 * Returns 0 on success, negative on failure
1622 **/
1623
1624static int
1625ixgb_change_mtu(struct net_device *netdev, int new_mtu)
1626{
1627        struct ixgb_adapter *adapter = netdev_priv(netdev);
1628        int max_frame = new_mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;
1629        int old_max_frame = netdev->mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;
1630
1631        /* MTU < 68 is an error for IPv4 traffic, just don't allow it */
1632        if ((new_mtu < 68) ||
1633            (max_frame > IXGB_MAX_JUMBO_FRAME_SIZE + ENET_FCS_LENGTH)) {
1634                netif_err(adapter, probe, adapter->netdev,
1635                          "Invalid MTU setting %d\n", new_mtu);
1636                return -EINVAL;
1637        }
1638
1639        if (old_max_frame == max_frame)
1640                return 0;
1641
1642        if (netif_running(netdev))
1643                ixgb_down(adapter, true);
1644
1645        adapter->rx_buffer_len = max_frame + 8; /* + 8 for errata */
1646
1647        netdev->mtu = new_mtu;
1648
1649        if (netif_running(netdev))
1650                ixgb_up(adapter);
1651
1652        return 0;
1653}
1654
1655/**
1656 * ixgb_update_stats - Update the board statistics counters.
1657 * @adapter: board private structure
1658 **/
1659
1660void
1661ixgb_update_stats(struct ixgb_adapter *adapter)
1662{
1663        struct net_device *netdev = adapter->netdev;
1664        struct pci_dev *pdev = adapter->pdev;
1665
1666        /* Prevent stats update while adapter is being reset */
1667        if (pci_channel_offline(pdev))
1668                return;
1669
1670        if ((netdev->flags & IFF_PROMISC) || (netdev->flags & IFF_ALLMULTI) ||
1671           (netdev_mc_count(netdev) > IXGB_MAX_NUM_MULTICAST_ADDRESSES)) {
1672                u64 multi = IXGB_READ_REG(&adapter->hw, MPRCL);
1673                u32 bcast_l = IXGB_READ_REG(&adapter->hw, BPRCL);
1674                u32 bcast_h = IXGB_READ_REG(&adapter->hw, BPRCH);
1675                u64 bcast = ((u64)bcast_h << 32) | bcast_l;
1676
1677                multi |= ((u64)IXGB_READ_REG(&adapter->hw, MPRCH) << 32);
1678                /* fix up multicast stats by removing broadcasts */
1679                if (multi >= bcast)
1680                        multi -= bcast;
1681
1682                adapter->stats.mprcl += (multi & 0xFFFFFFFF);
1683                adapter->stats.mprch += (multi >> 32);
1684                adapter->stats.bprcl += bcast_l;
1685                adapter->stats.bprch += bcast_h;
1686        } else {
1687                adapter->stats.mprcl += IXGB_READ_REG(&adapter->hw, MPRCL);
1688                adapter->stats.mprch += IXGB_READ_REG(&adapter->hw, MPRCH);
1689                adapter->stats.bprcl += IXGB_READ_REG(&adapter->hw, BPRCL);
1690                adapter->stats.bprch += IXGB_READ_REG(&adapter->hw, BPRCH);
1691        }
1692        adapter->stats.tprl += IXGB_READ_REG(&adapter->hw, TPRL);
1693        adapter->stats.tprh += IXGB_READ_REG(&adapter->hw, TPRH);
1694        adapter->stats.gprcl += IXGB_READ_REG(&adapter->hw, GPRCL);
1695        adapter->stats.gprch += IXGB_READ_REG(&adapter->hw, GPRCH);
1696        adapter->stats.uprcl += IXGB_READ_REG(&adapter->hw, UPRCL);
1697        adapter->stats.uprch += IXGB_READ_REG(&adapter->hw, UPRCH);
1698        adapter->stats.vprcl += IXGB_READ_REG(&adapter->hw, VPRCL);
1699        adapter->stats.vprch += IXGB_READ_REG(&adapter->hw, VPRCH);
1700        adapter->stats.jprcl += IXGB_READ_REG(&adapter->hw, JPRCL);
1701        adapter->stats.jprch += IXGB_READ_REG(&adapter->hw, JPRCH);
1702        adapter->stats.gorcl += IXGB_READ_REG(&adapter->hw, GORCL);
1703        adapter->stats.gorch += IXGB_READ_REG(&adapter->hw, GORCH);
1704        adapter->stats.torl += IXGB_READ_REG(&adapter->hw, TORL);
1705        adapter->stats.torh += IXGB_READ_REG(&adapter->hw, TORH);
1706        adapter->stats.rnbc += IXGB_READ_REG(&adapter->hw, RNBC);
1707        adapter->stats.ruc += IXGB_READ_REG(&adapter->hw, RUC);
1708        adapter->stats.roc += IXGB_READ_REG(&adapter->hw, ROC);
1709        adapter->stats.rlec += IXGB_READ_REG(&adapter->hw, RLEC);
1710        adapter->stats.crcerrs += IXGB_READ_REG(&adapter->hw, CRCERRS);
1711        adapter->stats.icbc += IXGB_READ_REG(&adapter->hw, ICBC);
1712        adapter->stats.ecbc += IXGB_READ_REG(&adapter->hw, ECBC);
1713        adapter->stats.mpc += IXGB_READ_REG(&adapter->hw, MPC);
1714        adapter->stats.tptl += IXGB_READ_REG(&adapter->hw, TPTL);
1715        adapter->stats.tpth += IXGB_READ_REG(&adapter->hw, TPTH);
1716        adapter->stats.gptcl += IXGB_READ_REG(&adapter->hw, GPTCL);
1717        adapter->stats.gptch += IXGB_READ_REG(&adapter->hw, GPTCH);
1718        adapter->stats.bptcl += IXGB_READ_REG(&adapter->hw, BPTCL);
1719        adapter->stats.bptch += IXGB_READ_REG(&adapter->hw, BPTCH);
1720        adapter->stats.mptcl += IXGB_READ_REG(&adapter->hw, MPTCL);
1721        adapter->stats.mptch += IXGB_READ_REG(&adapter->hw, MPTCH);
1722        adapter->stats.uptcl += IXGB_READ_REG(&adapter->hw, UPTCL);
1723        adapter->stats.uptch += IXGB_READ_REG(&adapter->hw, UPTCH);
1724        adapter->stats.vptcl += IXGB_READ_REG(&adapter->hw, VPTCL);
1725        adapter->stats.vptch += IXGB_READ_REG(&adapter->hw, VPTCH);
1726        adapter->stats.jptcl += IXGB_READ_REG(&adapter->hw, JPTCL);
1727        adapter->stats.jptch += IXGB_READ_REG(&adapter->hw, JPTCH);
1728        adapter->stats.gotcl += IXGB_READ_REG(&adapter->hw, GOTCL);
1729        adapter->stats.gotch += IXGB_READ_REG(&adapter->hw, GOTCH);
1730        adapter->stats.totl += IXGB_READ_REG(&adapter->hw, TOTL);
1731        adapter->stats.toth += IXGB_READ_REG(&adapter->hw, TOTH);
1732        adapter->stats.dc += IXGB_READ_REG(&adapter->hw, DC);
1733        adapter->stats.plt64c += IXGB_READ_REG(&adapter->hw, PLT64C);
1734        adapter->stats.tsctc += IXGB_READ_REG(&adapter->hw, TSCTC);
1735        adapter->stats.tsctfc += IXGB_READ_REG(&adapter->hw, TSCTFC);
1736        adapter->stats.ibic += IXGB_READ_REG(&adapter->hw, IBIC);
1737        adapter->stats.rfc += IXGB_READ_REG(&adapter->hw, RFC);
1738        adapter->stats.lfc += IXGB_READ_REG(&adapter->hw, LFC);
1739        adapter->stats.pfrc += IXGB_READ_REG(&adapter->hw, PFRC);
1740        adapter->stats.pftc += IXGB_READ_REG(&adapter->hw, PFTC);
1741        adapter->stats.mcfrc += IXGB_READ_REG(&adapter->hw, MCFRC);
1742        adapter->stats.mcftc += IXGB_READ_REG(&adapter->hw, MCFTC);
1743        adapter->stats.xonrxc += IXGB_READ_REG(&adapter->hw, XONRXC);
1744        adapter->stats.xontxc += IXGB_READ_REG(&adapter->hw, XONTXC);
1745        adapter->stats.xoffrxc += IXGB_READ_REG(&adapter->hw, XOFFRXC);
1746        adapter->stats.xofftxc += IXGB_READ_REG(&adapter->hw, XOFFTXC);
1747        adapter->stats.rjc += IXGB_READ_REG(&adapter->hw, RJC);
1748
1749        /* Fill out the OS statistics structure */
1750
1751        netdev->stats.rx_packets = adapter->stats.gprcl;
1752        netdev->stats.tx_packets = adapter->stats.gptcl;
1753        netdev->stats.rx_bytes = adapter->stats.gorcl;
1754        netdev->stats.tx_bytes = adapter->stats.gotcl;
1755        netdev->stats.multicast = adapter->stats.mprcl;
1756        netdev->stats.collisions = 0;
1757
1758        /* ignore RLEC as it reports errors for padded (<64bytes) frames
1759         * with a length in the type/len field */
1760        netdev->stats.rx_errors =
1761            /* adapter->stats.rnbc + */ adapter->stats.crcerrs +
1762            adapter->stats.ruc +
1763            adapter->stats.roc /*+ adapter->stats.rlec */  +
1764            adapter->stats.icbc +
1765            adapter->stats.ecbc + adapter->stats.mpc;
1766
1767        /* see above
1768         * netdev->stats.rx_length_errors = adapter->stats.rlec;
1769         */
1770
1771        netdev->stats.rx_crc_errors = adapter->stats.crcerrs;
1772        netdev->stats.rx_fifo_errors = adapter->stats.mpc;
1773        netdev->stats.rx_missed_errors = adapter->stats.mpc;
1774        netdev->stats.rx_over_errors = adapter->stats.mpc;
1775
1776        netdev->stats.tx_errors = 0;
1777        netdev->stats.rx_frame_errors = 0;
1778        netdev->stats.tx_aborted_errors = 0;
1779        netdev->stats.tx_carrier_errors = 0;
1780        netdev->stats.tx_fifo_errors = 0;
1781        netdev->stats.tx_heartbeat_errors = 0;
1782        netdev->stats.tx_window_errors = 0;
1783}
1784
1785#define IXGB_MAX_INTR 10
1786/**
1787 * ixgb_intr - Interrupt Handler
1788 * @irq: interrupt number
1789 * @data: pointer to a network interface device structure
1790 **/
1791
1792static irqreturn_t
1793ixgb_intr(int irq, void *data)
1794{
1795        struct net_device *netdev = data;
1796        struct ixgb_adapter *adapter = netdev_priv(netdev);
1797        struct ixgb_hw *hw = &adapter->hw;
1798        u32 icr = IXGB_READ_REG(hw, ICR);
1799
1800        if (unlikely(!icr))
1801                return IRQ_NONE;  /* Not our interrupt */
1802
1803        if (unlikely(icr & (IXGB_INT_RXSEQ | IXGB_INT_LSC)))
1804                if (!test_bit(__IXGB_DOWN, &adapter->flags))
1805                        mod_timer(&adapter->watchdog_timer, jiffies);
1806
1807        if (napi_schedule_prep(&adapter->napi)) {
1808
1809                /* Disable interrupts and register for poll. The flush
1810                  of the posted write is intentionally left out.
1811                */
1812
1813                IXGB_WRITE_REG(&adapter->hw, IMC, ~0);
1814                __napi_schedule(&adapter->napi);
1815        }
1816        return IRQ_HANDLED;
1817}
1818
1819/**
1820 * ixgb_clean - NAPI Rx polling callback
1821 * @adapter: board private structure
1822 **/
1823
1824static int
1825ixgb_clean(struct napi_struct *napi, int budget)
1826{
1827        struct ixgb_adapter *adapter = container_of(napi, struct ixgb_adapter, napi);
1828        int work_done = 0;
1829
1830        ixgb_clean_tx_irq(adapter);
1831        ixgb_clean_rx_irq(adapter, &work_done, budget);
1832
1833        /* If budget not fully consumed, exit the polling mode */
1834        if (work_done < budget) {
1835                napi_complete(napi);
1836                if (!test_bit(__IXGB_DOWN, &adapter->flags))
1837                        ixgb_irq_enable(adapter);
1838        }
1839
1840        return work_done;
1841}
1842
1843/**
1844 * ixgb_clean_tx_irq - Reclaim resources after transmit completes
1845 * @adapter: board private structure
1846 **/
1847
1848static bool
1849ixgb_clean_tx_irq(struct ixgb_adapter *adapter)
1850{
1851        struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
1852        struct net_device *netdev = adapter->netdev;
1853        struct ixgb_tx_desc *tx_desc, *eop_desc;
1854        struct ixgb_buffer *buffer_info;
1855        unsigned int i, eop;
1856        bool cleaned = false;
1857
1858        i = tx_ring->next_to_clean;
1859        eop = tx_ring->buffer_info[i].next_to_watch;
1860        eop_desc = IXGB_TX_DESC(*tx_ring, eop);
1861
1862        while (eop_desc->status & IXGB_TX_DESC_STATUS_DD) {
1863
1864                rmb(); /* read buffer_info after eop_desc */
1865                for (cleaned = false; !cleaned; ) {
1866                        tx_desc = IXGB_TX_DESC(*tx_ring, i);
1867                        buffer_info = &tx_ring->buffer_info[i];
1868
1869                        if (tx_desc->popts &
1870                           (IXGB_TX_DESC_POPTS_TXSM |
1871                            IXGB_TX_DESC_POPTS_IXSM))
1872                                adapter->hw_csum_tx_good++;
1873
1874                        ixgb_unmap_and_free_tx_resource(adapter, buffer_info);
1875
1876                        *(u32 *)&(tx_desc->status) = 0;
1877
1878                        cleaned = (i == eop);
1879                        if (++i == tx_ring->count) i = 0;
1880                }
1881
1882                eop = tx_ring->buffer_info[i].next_to_watch;
1883                eop_desc = IXGB_TX_DESC(*tx_ring, eop);
1884        }
1885
1886        tx_ring->next_to_clean = i;
1887
1888        if (unlikely(cleaned && netif_carrier_ok(netdev) &&
1889                     IXGB_DESC_UNUSED(tx_ring) >= DESC_NEEDED)) {
1890                /* Make sure that anybody stopping the queue after this
1891                 * sees the new next_to_clean. */
1892                smp_mb();
1893
1894                if (netif_queue_stopped(netdev) &&
1895                    !(test_bit(__IXGB_DOWN, &adapter->flags))) {
1896                        netif_wake_queue(netdev);
1897                        ++adapter->restart_queue;
1898                }
1899        }
1900
1901        if (adapter->detect_tx_hung) {
1902                /* detect a transmit hang in hardware, this serializes the
1903                 * check with the clearing of time_stamp and movement of i */
1904                adapter->detect_tx_hung = false;
1905                if (tx_ring->buffer_info[eop].time_stamp &&
1906                   time_after(jiffies, tx_ring->buffer_info[eop].time_stamp + HZ)
1907                   && !(IXGB_READ_REG(&adapter->hw, STATUS) &
1908                        IXGB_STATUS_TXOFF)) {
1909                        /* detected Tx unit hang */
1910                        netif_err(adapter, drv, adapter->netdev,
1911                                  "Detected Tx Unit Hang\n"
1912                                  "  TDH                  <%x>\n"
1913                                  "  TDT                  <%x>\n"
1914                                  "  next_to_use          <%x>\n"
1915                                  "  next_to_clean        <%x>\n"
1916                                  "buffer_info[next_to_clean]\n"
1917                                  "  time_stamp           <%lx>\n"
1918                                  "  next_to_watch        <%x>\n"
1919                                  "  jiffies              <%lx>\n"
1920                                  "  next_to_watch.status <%x>\n",
1921                                  IXGB_READ_REG(&adapter->hw, TDH),
1922                                  IXGB_READ_REG(&adapter->hw, TDT),
1923                                  tx_ring->next_to_use,
1924                                  tx_ring->next_to_clean,
1925                                  tx_ring->buffer_info[eop].time_stamp,
1926                                  eop,
1927                                  jiffies,
1928                                  eop_desc->status);
1929                        netif_stop_queue(netdev);
1930                }
1931        }
1932
1933        return cleaned;
1934}
1935
1936/**
1937 * ixgb_rx_checksum - Receive Checksum Offload for 82597.
1938 * @adapter: board private structure
1939 * @rx_desc: receive descriptor
1940 * @sk_buff: socket buffer with received data
1941 **/
1942
1943static void
1944ixgb_rx_checksum(struct ixgb_adapter *adapter,
1945                 struct ixgb_rx_desc *rx_desc,
1946                 struct sk_buff *skb)
1947{
1948        /* Ignore Checksum bit is set OR
1949         * TCP Checksum has not been calculated
1950         */
1951        if ((rx_desc->status & IXGB_RX_DESC_STATUS_IXSM) ||
1952           (!(rx_desc->status & IXGB_RX_DESC_STATUS_TCPCS))) {
1953                skb_checksum_none_assert(skb);
1954                return;
1955        }
1956
1957        /* At this point we know the hardware did the TCP checksum */
1958        /* now look at the TCP checksum error bit */
1959        if (rx_desc->errors & IXGB_RX_DESC_ERRORS_TCPE) {
1960                /* let the stack verify checksum errors */
1961                skb_checksum_none_assert(skb);
1962                adapter->hw_csum_rx_error++;
1963        } else {
1964                /* TCP checksum is good */
1965                skb->ip_summed = CHECKSUM_UNNECESSARY;
1966                adapter->hw_csum_rx_good++;
1967        }
1968}
1969
1970/*
1971 * this should improve performance for small packets with large amounts
1972 * of reassembly being done in the stack
1973 */
1974static void ixgb_check_copybreak(struct net_device *netdev,
1975                                 struct ixgb_buffer *buffer_info,
1976                                 u32 length, struct sk_buff **skb)
1977{
1978        struct sk_buff *new_skb;
1979
1980        if (length > copybreak)
1981                return;
1982
1983        new_skb = netdev_alloc_skb_ip_align(netdev, length);
1984        if (!new_skb)
1985                return;
1986
1987        skb_copy_to_linear_data_offset(new_skb, -NET_IP_ALIGN,
1988                                       (*skb)->data - NET_IP_ALIGN,
1989                                       length + NET_IP_ALIGN);
1990        /* save the skb in buffer_info as good */
1991        buffer_info->skb = *skb;
1992        *skb = new_skb;
1993}
1994
1995/**
1996 * ixgb_clean_rx_irq - Send received data up the network stack,
1997 * @adapter: board private structure
1998 **/
1999
2000static bool
2001ixgb_clean_rx_irq(struct ixgb_adapter *adapter, int *work_done, int work_to_do)
2002{
2003        struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
2004        struct net_device *netdev = adapter->netdev;
2005        struct pci_dev *pdev = adapter->pdev;
2006        struct ixgb_rx_desc *rx_desc, *next_rxd;
2007        struct ixgb_buffer *buffer_info, *next_buffer, *next2_buffer;
2008        u32 length;
2009        unsigned int i, j;
2010        int cleaned_count = 0;
2011        bool cleaned = false;
2012
2013        i = rx_ring->next_to_clean;
2014        rx_desc = IXGB_RX_DESC(*rx_ring, i);
2015        buffer_info = &rx_ring->buffer_info[i];
2016
2017        while (rx_desc->status & IXGB_RX_DESC_STATUS_DD) {
2018                struct sk_buff *skb;
2019                u8 status;
2020
2021                if (*work_done >= work_to_do)
2022                        break;
2023
2024                (*work_done)++;
2025                rmb();  /* read descriptor and rx_buffer_info after status DD */
2026                status = rx_desc->status;
2027                skb = buffer_info->skb;
2028                buffer_info->skb = NULL;
2029
2030                prefetch(skb->data - NET_IP_ALIGN);
2031
2032                if (++i == rx_ring->count)
2033                        i = 0;
2034                next_rxd = IXGB_RX_DESC(*rx_ring, i);
2035                prefetch(next_rxd);
2036
2037                j = i + 1;
2038                if (j == rx_ring->count)
2039                        j = 0;
2040                next2_buffer = &rx_ring->buffer_info[j];
2041                prefetch(next2_buffer);
2042
2043                next_buffer = &rx_ring->buffer_info[i];
2044
2045                cleaned = true;
2046                cleaned_count++;
2047
2048                dma_unmap_single(&pdev->dev,
2049                                 buffer_info->dma,
2050                                 buffer_info->length,
2051                                 DMA_FROM_DEVICE);
2052                buffer_info->dma = 0;
2053
2054                length = le16_to_cpu(rx_desc->length);
2055                rx_desc->length = 0;
2056
2057                if (unlikely(!(status & IXGB_RX_DESC_STATUS_EOP))) {
2058
2059                        /* All receives must fit into a single buffer */
2060
2061                        pr_debug("Receive packet consumed multiple buffers length<%x>\n",
2062                                 length);
2063
2064                        dev_kfree_skb_irq(skb);
2065                        goto rxdesc_done;
2066                }
2067
2068                if (unlikely(rx_desc->errors &
2069                    (IXGB_RX_DESC_ERRORS_CE | IXGB_RX_DESC_ERRORS_SE |
2070                     IXGB_RX_DESC_ERRORS_P | IXGB_RX_DESC_ERRORS_RXE))) {
2071                        dev_kfree_skb_irq(skb);
2072                        goto rxdesc_done;
2073                }
2074
2075                ixgb_check_copybreak(netdev, buffer_info, length, &skb);
2076
2077                /* Good Receive */
2078                skb_put(skb, length);
2079
2080                /* Receive Checksum Offload */
2081                ixgb_rx_checksum(adapter, rx_desc, skb);
2082
2083                skb->protocol = eth_type_trans(skb, netdev);
2084                if (status & IXGB_RX_DESC_STATUS_VP)
2085                        __vlan_hwaccel_put_tag(skb, htons(ETH_P_8021Q),
2086                                       le16_to_cpu(rx_desc->special));
2087
2088                netif_receive_skb(skb);
2089
2090rxdesc_done:
2091                /* clean up descriptor, might be written over by hw */
2092                rx_desc->status = 0;
2093
2094                /* return some buffers to hardware, one at a time is too slow */
2095                if (unlikely(cleaned_count >= IXGB_RX_BUFFER_WRITE)) {
2096                        ixgb_alloc_rx_buffers(adapter, cleaned_count);
2097                        cleaned_count = 0;
2098                }
2099
2100                /* use prefetched values */
2101                rx_desc = next_rxd;
2102                buffer_info = next_buffer;
2103        }
2104
2105        rx_ring->next_to_clean = i;
2106
2107        cleaned_count = IXGB_DESC_UNUSED(rx_ring);
2108        if (cleaned_count)
2109                ixgb_alloc_rx_buffers(adapter, cleaned_count);
2110
2111        return cleaned;
2112}
2113
2114/**
2115 * ixgb_alloc_rx_buffers - Replace used receive buffers
2116 * @adapter: address of board private structure
2117 **/
2118
2119static void
2120ixgb_alloc_rx_buffers(struct ixgb_adapter *adapter, int cleaned_count)
2121{
2122        struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
2123        struct net_device *netdev = adapter->netdev;
2124        struct pci_dev *pdev = adapter->pdev;
2125        struct ixgb_rx_desc *rx_desc;
2126        struct ixgb_buffer *buffer_info;
2127        struct sk_buff *skb;
2128        unsigned int i;
2129        long cleancount;
2130
2131        i = rx_ring->next_to_use;
2132        buffer_info = &rx_ring->buffer_info[i];
2133        cleancount = IXGB_DESC_UNUSED(rx_ring);
2134
2135
2136        /* leave three descriptors unused */
2137        while (--cleancount > 2 && cleaned_count--) {
2138                /* recycle! its good for you */
2139                skb = buffer_info->skb;
2140                if (skb) {
2141                        skb_trim(skb, 0);
2142                        goto map_skb;
2143                }
2144
2145                skb = netdev_alloc_skb_ip_align(netdev, adapter->rx_buffer_len);
2146                if (unlikely(!skb)) {
2147                        /* Better luck next round */
2148                        adapter->alloc_rx_buff_failed++;
2149                        break;
2150                }
2151
2152                buffer_info->skb = skb;
2153                buffer_info->length = adapter->rx_buffer_len;
2154map_skb:
2155                buffer_info->dma = dma_map_single(&pdev->dev,
2156                                                  skb->data,
2157                                                  adapter->rx_buffer_len,
2158                                                  DMA_FROM_DEVICE);
2159                if (dma_mapping_error(&pdev->dev, buffer_info->dma)) {
2160                        adapter->alloc_rx_buff_failed++;
2161                        break;
2162                }
2163
2164                rx_desc = IXGB_RX_DESC(*rx_ring, i);
2165                rx_desc->buff_addr = cpu_to_le64(buffer_info->dma);
2166                /* guarantee DD bit not set now before h/w gets descriptor
2167                 * this is the rest of the workaround for h/w double
2168                 * writeback. */
2169                rx_desc->status = 0;
2170
2171
2172                if (++i == rx_ring->count)
2173                        i = 0;
2174                buffer_info = &rx_ring->buffer_info[i];
2175        }
2176
2177        if (likely(rx_ring->next_to_use != i)) {
2178                rx_ring->next_to_use = i;
2179                if (unlikely(i-- == 0))
2180                        i = (rx_ring->count - 1);
2181
2182                /* Force memory writes to complete before letting h/w
2183                 * know there are new descriptors to fetch.  (Only
2184                 * applicable for weak-ordered memory model archs, such
2185                 * as IA-64). */
2186                wmb();
2187                IXGB_WRITE_REG(&adapter->hw, RDT, i);
2188        }
2189}
2190
2191static void
2192ixgb_vlan_strip_enable(struct ixgb_adapter *adapter)
2193{
2194        u32 ctrl;
2195
2196        /* enable VLAN tag insert/strip */
2197        ctrl = IXGB_READ_REG(&adapter->hw, CTRL0);
2198        ctrl |= IXGB_CTRL0_VME;
2199        IXGB_WRITE_REG(&adapter->hw, CTRL0, ctrl);
2200}
2201
2202static void
2203ixgb_vlan_strip_disable(struct ixgb_adapter *adapter)
2204{
2205        u32 ctrl;
2206
2207        /* disable VLAN tag insert/strip */
2208        ctrl = IXGB_READ_REG(&adapter->hw, CTRL0);
2209        ctrl &= ~IXGB_CTRL0_VME;
2210        IXGB_WRITE_REG(&adapter->hw, CTRL0, ctrl);
2211}
2212
2213static int
2214ixgb_vlan_rx_add_vid(struct net_device *netdev, __be16 proto, u16 vid)
2215{
2216        struct ixgb_adapter *adapter = netdev_priv(netdev);
2217        u32 vfta, index;
2218
2219        /* add VID to filter table */
2220
2221        index = (vid >> 5) & 0x7F;
2222        vfta = IXGB_READ_REG_ARRAY(&adapter->hw, VFTA, index);
2223        vfta |= (1 << (vid & 0x1F));
2224        ixgb_write_vfta(&adapter->hw, index, vfta);
2225        set_bit(vid, adapter->active_vlans);
2226
2227        return 0;
2228}
2229
2230static int
2231ixgb_vlan_rx_kill_vid(struct net_device *netdev, __be16 proto, u16 vid)
2232{
2233        struct ixgb_adapter *adapter = netdev_priv(netdev);
2234        u32 vfta, index;
2235
2236        /* remove VID from filter table */
2237
2238        index = (vid >> 5) & 0x7F;
2239        vfta = IXGB_READ_REG_ARRAY(&adapter->hw, VFTA, index);
2240        vfta &= ~(1 << (vid & 0x1F));
2241        ixgb_write_vfta(&adapter->hw, index, vfta);
2242        clear_bit(vid, adapter->active_vlans);
2243
2244        return 0;
2245}
2246
2247static void
2248ixgb_restore_vlan(struct ixgb_adapter *adapter)
2249{
2250        u16 vid;
2251
2252        for_each_set_bit(vid, adapter->active_vlans, VLAN_N_VID)
2253                ixgb_vlan_rx_add_vid(adapter->netdev, htons(ETH_P_8021Q), vid);
2254}
2255
2256#ifdef CONFIG_NET_POLL_CONTROLLER
2257/*
2258 * Polling 'interrupt' - used by things like netconsole to send skbs
2259 * without having to re-enable interrupts. It's not called while
2260 * the interrupt routine is executing.
2261 */
2262
2263static void ixgb_netpoll(struct net_device *dev)
2264{
2265        struct ixgb_adapter *adapter = netdev_priv(dev);
2266
2267        disable_irq(adapter->pdev->irq);
2268        ixgb_intr(adapter->pdev->irq, dev);
2269        enable_irq(adapter->pdev->irq);
2270}
2271#endif
2272
2273/**
2274 * ixgb_io_error_detected - called when PCI error is detected
2275 * @pdev:    pointer to pci device with error
2276 * @state:   pci channel state after error
2277 *
2278 * This callback is called by the PCI subsystem whenever
2279 * a PCI bus error is detected.
2280 */
2281static pci_ers_result_t ixgb_io_error_detected(struct pci_dev *pdev,
2282                                               enum pci_channel_state state)
2283{
2284        struct net_device *netdev = pci_get_drvdata(pdev);
2285        struct ixgb_adapter *adapter = netdev_priv(netdev);
2286
2287        netif_device_detach(netdev);
2288
2289        if (state == pci_channel_io_perm_failure)
2290                return PCI_ERS_RESULT_DISCONNECT;
2291
2292        if (netif_running(netdev))
2293                ixgb_down(adapter, true);
2294
2295        pci_disable_device(pdev);
2296
2297        /* Request a slot reset. */
2298        return PCI_ERS_RESULT_NEED_RESET;
2299}
2300
2301/**
2302 * ixgb_io_slot_reset - called after the pci bus has been reset.
2303 * @pdev    pointer to pci device with error
2304 *
2305 * This callback is called after the PCI bus has been reset.
2306 * Basically, this tries to restart the card from scratch.
2307 * This is a shortened version of the device probe/discovery code,
2308 * it resembles the first-half of the ixgb_probe() routine.
2309 */
2310static pci_ers_result_t ixgb_io_slot_reset(struct pci_dev *pdev)
2311{
2312        struct net_device *netdev = pci_get_drvdata(pdev);
2313        struct ixgb_adapter *adapter = netdev_priv(netdev);
2314
2315        if (pci_enable_device(pdev)) {
2316                netif_err(adapter, probe, adapter->netdev,
2317                          "Cannot re-enable PCI device after reset\n");
2318                return PCI_ERS_RESULT_DISCONNECT;
2319        }
2320
2321        /* Perform card reset only on one instance of the card */
2322        if (0 != PCI_FUNC (pdev->devfn))
2323                return PCI_ERS_RESULT_RECOVERED;
2324
2325        pci_set_master(pdev);
2326
2327        netif_carrier_off(netdev);
2328        netif_stop_queue(netdev);
2329        ixgb_reset(adapter);
2330
2331        /* Make sure the EEPROM is good */
2332        if (!ixgb_validate_eeprom_checksum(&adapter->hw)) {
2333                netif_err(adapter, probe, adapter->netdev,
2334                          "After reset, the EEPROM checksum is not valid\n");
2335                return PCI_ERS_RESULT_DISCONNECT;
2336        }
2337        ixgb_get_ee_mac_addr(&adapter->hw, netdev->dev_addr);
2338        memcpy(netdev->perm_addr, netdev->dev_addr, netdev->addr_len);
2339
2340        if (!is_valid_ether_addr(netdev->perm_addr)) {
2341                netif_err(adapter, probe, adapter->netdev,
2342                          "After reset, invalid MAC address\n");
2343                return PCI_ERS_RESULT_DISCONNECT;
2344        }
2345
2346        return PCI_ERS_RESULT_RECOVERED;
2347}
2348
2349/**
2350 * ixgb_io_resume - called when its OK to resume normal operations
2351 * @pdev    pointer to pci device with error
2352 *
2353 * The error recovery driver tells us that its OK to resume
2354 * normal operation. Implementation resembles the second-half
2355 * of the ixgb_probe() routine.
2356 */
2357static void ixgb_io_resume(struct pci_dev *pdev)
2358{
2359        struct net_device *netdev = pci_get_drvdata(pdev);
2360        struct ixgb_adapter *adapter = netdev_priv(netdev);
2361
2362        pci_set_master(pdev);
2363
2364        if (netif_running(netdev)) {
2365                if (ixgb_up(adapter)) {
2366                        pr_err("can't bring device back up after reset\n");
2367                        return;
2368                }
2369        }
2370
2371        netif_device_attach(netdev);
2372        mod_timer(&adapter->watchdog_timer, jiffies);
2373}
2374
2375/* ixgb_main.c */
2376