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 <[email protected]>
  24   e1000-devel Mailing List <[email protected]>
  25   Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
  26
  27 *******************************************************************************/
  28
  29 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  30
  31 #include "ixgb.h"
  32
  33 char ixgb_driver_name[] = "ixgb";
  34 static char ixgb_driver_string[] = "Intel(R) PRO/10GbE Network Driver";
  35
  36 #define DRIVERNAPI "-NAPI"
  37 #define DRV_VERSION "1.0.135-k2" DRIVERNAPI
  38 const char ixgb_driver_version[] = DRV_VERSION;
  39 static const char ixgb_copyright[] = "Copyright (c) 1999-2008 Intel Corporation.";
  40
  41 #define IXGB_CB_LENGTH 256
  42 static unsigned int copybreak __read_mostly = IXGB_CB_LENGTH;
  43 module_param(copybreak, uint, 0644);
  44 MODULE_PARM_DESC(copybreak,
  45         "Maximum size of packet that is copied to a new buffer on receive");
  46
  47 /* ixgb_pci_tbl - PCI Device ID Table
  48  *
  49  * Wildcard entries (PCI_ANY_ID) should come last
  50  * Last entry must be all 0s
  51  *
  52  * { Vendor ID, Device ID, SubVendor ID, SubDevice ID,
  53  *   Class, Class Mask, private data (not used) }
  54  */
  55 static DEFINE_PCI_DEVICE_TABLE(ixgb_pci_tbl) = {
  56         {INTEL_VENDOR_ID, IXGB_DEVICE_ID_82597EX,
  57          PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
  58         {INTEL_VENDOR_ID, IXGB_DEVICE_ID_82597EX_CX4,
  59          PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
  60         {INTEL_VENDOR_ID, IXGB_DEVICE_ID_82597EX_SR,
  61          PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
  62         {INTEL_VENDOR_ID, IXGB_DEVICE_ID_82597EX_LR,
  63          PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
  64
  65         /* required last entry */
  66         {0,}
  67 };
  68
  69 MODULE_DEVICE_TABLE(pci, ixgb_pci_tbl);
  70
  71 /* Local Function Prototypes */
  72 static int ixgb_init_module(void);
  73 static void ixgb_exit_module(void);
  74 static int ixgb_probe(struct pci_dev *pdev, const struct pci_device_id *ent);
  75 static void __devexit ixgb_remove(struct pci_dev *pdev);
  76 static int ixgb_sw_init(struct ixgb_adapter *adapter);
  77 static int ixgb_open(struct net_device *netdev);
  78 static int ixgb_close(struct net_device *netdev);
  79 static void ixgb_configure_tx(struct ixgb_adapter *adapter);
  80 static void ixgb_configure_rx(struct ixgb_adapter *adapter);
  81 static void ixgb_setup_rctl(struct ixgb_adapter *adapter);
  82 static void ixgb_clean_tx_ring(struct ixgb_adapter *adapter);
  83 static void ixgb_clean_rx_ring(struct ixgb_adapter *adapter);
  84 static void ixgb_set_multi(struct net_device *netdev);
  85 static void ixgb_watchdog(unsigned long data);
  86 static netdev_tx_t ixgb_xmit_frame(struct sk_buff *skb,
  87                                    struct net_device *netdev);
  88 static struct net_device_stats *ixgb_get_stats(struct net_device *netdev);
  89 static int ixgb_change_mtu(struct net_device *netdev, int new_mtu);
  90 static int ixgb_set_mac(struct net_device *netdev, void *p);
  91 static irqreturn_t ixgb_intr(int irq, void *data);
  92 static bool ixgb_clean_tx_irq(struct ixgb_adapter *adapter);
  93
  94 static int ixgb_clean(struct napi_struct *, int);
  95 static bool ixgb_clean_rx_irq(struct ixgb_adapter *, int *, int);
  96 static void ixgb_alloc_rx_buffers(struct ixgb_adapter *, int);
  97
  98 static void ixgb_tx_timeout(struct net_device *dev);
  99 static void ixgb_tx_timeout_task(struct work_struct *work);
 100
 101 static void ixgb_vlan_strip_enable(struct ixgb_adapter *adapter);
 102 static void ixgb_vlan_strip_disable(struct ixgb_adapter *adapter);
 103 static void ixgb_vlan_rx_register(struct net_device *netdev,
 104                                   struct vlan_group *grp);
 105 static void ixgb_vlan_rx_add_vid(struct net_device *netdev, u16 vid);
 106 static void ixgb_vlan_rx_kill_vid(struct net_device *netdev, u16 vid);
 107 static void ixgb_restore_vlan(struct ixgb_adapter *adapter);
 108
 109 #ifdef CONFIG_NET_POLL_CONTROLLER
 110 /* for netdump / net console */
 111 static void ixgb_netpoll(struct net_device *dev);
 112 #endif
 113
 114 static pci_ers_result_t ixgb_io_error_detected (struct pci_dev *pdev,
 115                              enum pci_channel_state state);
 116 static pci_ers_result_t ixgb_io_slot_reset (struct pci_dev *pdev);
 117 static void ixgb_io_resume (struct pci_dev *pdev);
 118
 119 static struct pci_error_handlers ixgb_err_handler = {
 120         .error_detected = ixgb_io_error_detected,
 121         .slot_reset = ixgb_io_slot_reset,
 122         .resume = ixgb_io_resume,
 123 };
 124
 125 static struct pci_driver ixgb_driver = {
 126         .name     = ixgb_driver_name,
 127         .id_table = ixgb_pci_tbl,
 128         .probe    = ixgb_probe,
 129         .remove   = __devexit_p(ixgb_remove),
 130         .err_handler = &ixgb_err_handler
 131 };
 132
 133 MODULE_AUTHOR("Intel Corporation, <[email protected]>");
 134 MODULE_DESCRIPTION("Intel(R) PRO/10GbE Network Driver");
 135 MODULE_LICENSE("GPL");
 136 MODULE_VERSION(DRV_VERSION);
 137
 138 #define DEFAULT_DEBUG_LEVEL_SHIFT 3
 139 static int debug = DEFAULT_DEBUG_LEVEL_SHIFT;
 140 module_param(debug, int, 0);
 141 MODULE_PARM_DESC(debug, "Debug level (0=none,...,16=all)");
 142
 143 /**
 144  * ixgb_init_module - Driver Registration Routine
 145  *
 146  * ixgb_init_module is the first routine called when the driver is
 147  * loaded. All it does is register with the PCI subsystem.
 148  **/
 149
 150 static int __init
 151 ixgb_init_module(void)
 152 {
 153         pr_info("%s - version %s\n", ixgb_driver_string, ixgb_driver_version);
 154         pr_info("%s\n", ixgb_copyright);
 155
 156         return pci_register_driver(&ixgb_driver);
 157 }
 158
 159 module_init(ixgb_init_module);
 160
 161 /**
 162  * ixgb_exit_module - Driver Exit Cleanup Routine
 163  *
 164  * ixgb_exit_module is called just before the driver is removed
 165  * from memory.
 166  **/
 167
 168 static void __exit
 169 ixgb_exit_module(void)
 170 {
 171         pci_unregister_driver(&ixgb_driver);
 172 }
 173
 174 module_exit(ixgb_exit_module);
 175
 176 /**
 177  * ixgb_irq_disable - Mask off interrupt generation on the NIC
 178  * @adapter: board private structure
 179  **/
 180
 181 static void
 182 ixgb_irq_disable(struct ixgb_adapter *adapter)
 183 {
 184         IXGB_WRITE_REG(&adapter->hw, IMC, ~0);
 185         IXGB_WRITE_FLUSH(&adapter->hw);
 186         synchronize_irq(adapter->pdev->irq);
 187 }
 188
 189 /**
 190  * ixgb_irq_enable - Enable default interrupt generation settings
 191  * @adapter: board private structure
 192  **/
 193
 194 static void
 195 ixgb_irq_enable(struct ixgb_adapter *adapter)
 196 {
 197         u32 val = IXGB_INT_RXT0 | IXGB_INT_RXDMT0 |
 198                   IXGB_INT_TXDW | IXGB_INT_LSC;
 199         if (adapter->hw.subsystem_vendor_id == SUN_SUBVENDOR_ID)
 200                 val |= IXGB_INT_GPI0;
 201         IXGB_WRITE_REG(&adapter->hw, IMS, val);
 202         IXGB_WRITE_FLUSH(&adapter->hw);
 203 }
 204
 205 int
 206 ixgb_up(struct ixgb_adapter *adapter)
 207 {
 208         struct net_device *netdev = adapter->netdev;
 209         int err, irq_flags = IRQF_SHARED;
 210         int max_frame = netdev->mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;
 211         struct ixgb_hw *hw = &adapter->hw;
 212
 213         /* hardware has been reset, we need to reload some things */
 214
 215         ixgb_rar_set(hw, netdev->dev_addr, 0);
 216         ixgb_set_multi(netdev);
 217
 218         ixgb_restore_vlan(adapter);
 219
 220         ixgb_configure_tx(adapter);
 221         ixgb_setup_rctl(adapter);
 222         ixgb_configure_rx(adapter);
 223         ixgb_alloc_rx_buffers(adapter, IXGB_DESC_UNUSED(&adapter->rx_ring));
 224
 225         /* disable interrupts and get the hardware into a known state */
 226         IXGB_WRITE_REG(&adapter->hw, IMC, 0xffffffff);
 227
 228         /* only enable MSI if bus is in PCI-X mode */
 229         if (IXGB_READ_REG(&adapter->hw, STATUS) & IXGB_STATUS_PCIX_MODE) {
 230                 err = pci_enable_msi(adapter->pdev);
 231                 if (!err) {
 232                         adapter->have_msi = 1;
 233                         irq_flags = 0;
 234                 }
 235                 /* proceed to try to request regular interrupt */
 236         }
 237
 238         err = request_irq(adapter->pdev->irq, ixgb_intr, irq_flags,
 239                           netdev->name, netdev);
 240         if (err) {
 241                 if (adapter->have_msi)
 242                         pci_disable_msi(adapter->pdev);
 243                 netif_err(adapter, probe, adapter->netdev,
 244                           "Unable to allocate interrupt Error: %d\n", err);
 245                 return err;
 246         }
 247
 248         if ((hw->max_frame_size != max_frame) ||
 249                 (hw->max_frame_size !=
 250                 (IXGB_READ_REG(hw, MFS) >> IXGB_MFS_SHIFT))) {
 251
 252                 hw->max_frame_size = max_frame;
 253
 254                 IXGB_WRITE_REG(hw, MFS, hw->max_frame_size << IXGB_MFS_SHIFT);
 255
 256                 if (hw->max_frame_size >
 257                    IXGB_MAX_ENET_FRAME_SIZE_WITHOUT_FCS + ENET_FCS_LENGTH) {
 258                         u32 ctrl0 = IXGB_READ_REG(hw, CTRL0);
 259
 260                         if (!(ctrl0 & IXGB_CTRL0_JFE)) {
 261                                 ctrl0 |= IXGB_CTRL0_JFE;
 262                                 IXGB_WRITE_REG(hw, CTRL0, ctrl0);
 263                         }
 264                 }
 265         }
 266
 267         clear_bit(__IXGB_DOWN, &adapter->flags);
 268
 269         napi_enable(&adapter->napi);
 270         ixgb_irq_enable(adapter);
 271
 272         netif_wake_queue(netdev);
 273
 274         mod_timer(&adapter->watchdog_timer, jiffies);
 275
 276         return 0;
 277 }
 278
 279 void
 280 ixgb_down(struct ixgb_adapter *adapter, bool kill_watchdog)
 281 {
 282         struct net_device *netdev = adapter->netdev;
 283
 284         /* prevent the interrupt handler from restarting watchdog */
 285         set_bit(__IXGB_DOWN, &adapter->flags);
 286
 287         napi_disable(&adapter->napi);
 288         /* waiting for NAPI to complete can re-enable interrupts */
 289         ixgb_irq_disable(adapter);
 290         free_irq(adapter->pdev->irq, netdev);
 291
 292         if (adapter->have_msi)
 293                 pci_disable_msi(adapter->pdev);
 294
 295         if (kill_watchdog)
 296                 del_timer_sync(&adapter->watchdog_timer);
 297
 298         adapter->link_speed = 0;
 299         adapter->link_duplex = 0;
 300         netif_carrier_off(netdev);
 301         netif_stop_queue(netdev);
 302
 303         ixgb_reset(adapter);
 304         ixgb_clean_tx_ring(adapter);
 305         ixgb_clean_rx_ring(adapter);
 306 }
 307
 308 void
 309 ixgb_reset(struct ixgb_adapter *adapter)
 310 {
 311         struct ixgb_hw *hw = &adapter->hw;
 312
 313         ixgb_adapter_stop(hw);
 314         if (!ixgb_init_hw(hw))
 315                 netif_err(adapter, probe, adapter->netdev, "ixgb_init_hw failed\n");
 316
 317         /* restore frame size information */
 318         IXGB_WRITE_REG(hw, MFS, hw->max_frame_size << IXGB_MFS_SHIFT);
 319         if (hw->max_frame_size >
 320             IXGB_MAX_ENET_FRAME_SIZE_WITHOUT_FCS + ENET_FCS_LENGTH) {
 321                 u32 ctrl0 = IXGB_READ_REG(hw, CTRL0);
 322                 if (!(ctrl0 & IXGB_CTRL0_JFE)) {
 323                         ctrl0 |= IXGB_CTRL0_JFE;
 324                         IXGB_WRITE_REG(hw, CTRL0, ctrl0);
 325                 }
 326         }
 327 }
 328
 329 static const struct net_device_ops ixgb_netdev_ops = {
 330         .ndo_open               = ixgb_open,
 331         .ndo_stop               = ixgb_close,
 332         .ndo_start_xmit         = ixgb_xmit_frame,
 333         .ndo_get_stats          = ixgb_get_stats,
 334         .ndo_set_multicast_list = ixgb_set_multi,
 335         .ndo_validate_addr      = eth_validate_addr,
 336         .ndo_set_mac_address    = ixgb_set_mac,
 337         .ndo_change_mtu         = ixgb_change_mtu,
 338         .ndo_tx_timeout         = ixgb_tx_timeout,
 339         .ndo_vlan_rx_register   = ixgb_vlan_rx_register,
 340         .ndo_vlan_rx_add_vid    = ixgb_vlan_rx_add_vid,
 341         .ndo_vlan_rx_kill_vid   = ixgb_vlan_rx_kill_vid,
 342 #ifdef CONFIG_NET_POLL_CONTROLLER
 343         .ndo_poll_controller    = ixgb_netpoll,
 344 #endif
 345 };
 346
 347 /**
 348  * ixgb_probe - Device Initialization Routine
 349  * @pdev: PCI device information struct
 350  * @ent: entry in ixgb_pci_tbl
 351  *
 352  * Returns 0 on success, negative on failure
 353  *
 354  * ixgb_probe initializes an adapter identified by a pci_dev structure.
 355  * The OS initialization, configuring of the adapter private structure,
 356  * and a hardware reset occur.
 357  **/
 358
 359 static int __devinit
 360 ixgb_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
 361 {
 362         struct net_device *netdev = NULL;
 363         struct ixgb_adapter *adapter;
 364         static int cards_found = 0;
 365         int pci_using_dac;
 366         int i;
 367         int err;
 368
 369         err = pci_enable_device(pdev);
 370         if (err)
 371                 return err;
 372
 373         pci_using_dac = 0;
 374         err = dma_set_mask(&pdev->dev, DMA_BIT_MASK(64));
 375         if (!err) {
 376                 err = dma_set_coherent_mask(&pdev->dev, DMA_BIT_MASK(64));
 377                 if (!err)
 378                         pci_using_dac = 1;
 379         } else {
 380                 err = dma_set_mask(&pdev->dev, DMA_BIT_MASK(32));
 381                 if (err) {
 382                         err = dma_set_coherent_mask(&pdev->dev,
 383                                                     DMA_BIT_MASK(32));
 384                         if (err) {
 385                                 pr_err("No usable DMA configuration, aborting\n");
 386                                 goto err_dma_mask;
 387                         }
 388                 }
 389         }
 390
 391         err = pci_request_regions(pdev, ixgb_driver_name);
 392         if (err)
 393                 goto err_request_regions;
 394
 395         pci_set_master(pdev);
 396
 397         netdev = alloc_etherdev(sizeof(struct ixgb_adapter));
 398         if (!netdev) {
 399                 err = -ENOMEM;
 400                 goto err_alloc_etherdev;
 401         }
 402
 403         SET_NETDEV_DEV(netdev, &pdev->dev);
 404
 405         pci_set_drvdata(pdev, netdev);
 406         adapter = netdev_priv(netdev);
 407         adapter->netdev = netdev;
 408         adapter->pdev = pdev;
 409         adapter->hw.back = adapter;
 410         adapter->msg_enable = netif_msg_init(debug, DEFAULT_DEBUG_LEVEL_SHIFT);
 411
 412         adapter->hw.hw_addr = pci_ioremap_bar(pdev, BAR_0);
 413         if (!adapter->hw.hw_addr) {
 414                 err = -EIO;
 415                 goto err_ioremap;
 416         }
 417
 418         for (i = BAR_1; i <= BAR_5; i++) {
 419                 if (pci_resource_len(pdev, i) == 0)
 420                         continue;
 421                 if (pci_resource_flags(pdev, i) & IORESOURCE_IO) {
 422                         adapter->hw.io_base = pci_resource_start(pdev, i);
 423                         break;
 424                 }
 425         }
 426
 427         netdev->netdev_ops = &ixgb_netdev_ops;
 428         ixgb_set_ethtool_ops(netdev);
 429         netdev->watchdog_timeo = 5 * HZ;
 430         netif_napi_add(netdev, &adapter->napi, ixgb_clean, 64);
 431
 432         strncpy(netdev->name, pci_name(pdev), sizeof(netdev->name) - 1);
 433
 434         adapter->bd_number = cards_found;
 435         adapter->link_speed = 0;
 436         adapter->link_duplex = 0;
 437
 438         /* setup the private structure */
 439
 440         err = ixgb_sw_init(adapter);
 441         if (err)
 442                 goto err_sw_init;
 443
 444         netdev->features = NETIF_F_SG |
 445                            NETIF_F_HW_CSUM |
 446                            NETIF_F_HW_VLAN_TX |
 447                            NETIF_F_HW_VLAN_RX |
 448                            NETIF_F_HW_VLAN_FILTER;
 449         netdev->features |= NETIF_F_TSO;
 450
 451         if (pci_using_dac) {
 452                 netdev->features |= NETIF_F_HIGHDMA;
 453                 netdev->vlan_features |= NETIF_F_HIGHDMA;
 454         }
 455
 456         /* make sure the EEPROM is good */
 457
 458         if (!ixgb_validate_eeprom_checksum(&adapter->hw)) {
 459                 netif_err(adapter, probe, adapter->netdev,
 460                           "The EEPROM Checksum Is Not Valid\n");
 461                 err = -EIO;
 462                 goto err_eeprom;
 463         }
 464
 465         ixgb_get_ee_mac_addr(&adapter->hw, netdev->dev_addr);
 466         memcpy(netdev->perm_addr, netdev->dev_addr, netdev->addr_len);
 467
 468         if (!is_valid_ether_addr(netdev->perm_addr)) {
 469                 netif_err(adapter, probe, adapter->netdev, "Invalid MAC Address\n");
 470                 err = -EIO;
 471                 goto err_eeprom;
 472         }
 473
 474         adapter->part_num = ixgb_get_ee_pba_number(&adapter->hw);
 475
 476         init_timer(&adapter->watchdog_timer);
 477         adapter->watchdog_timer.function = ixgb_watchdog;
 478         adapter->watchdog_timer.data = (unsigned long)adapter;
 479
 480         INIT_WORK(&adapter->tx_timeout_task, ixgb_tx_timeout_task);
 481
 482         strcpy(netdev->name, "eth%d");
 483         err = register_netdev(netdev);
 484         if (err)
 485                 goto err_register;
 486
 487         /* carrier off reporting is important to ethtool even BEFORE open */
 488         netif_carrier_off(netdev);
 489
 490         netif_info(adapter, probe, adapter->netdev,
 491                    "Intel(R) PRO/10GbE Network Connection\n");
 492         ixgb_check_options(adapter);
 493         /* reset the hardware with the new settings */
 494
 495         ixgb_reset(adapter);
 496
 497         cards_found++;
 498         return 0;
 499
 500 err_register:
 501 err_sw_init:
 502 err_eeprom:
 503         iounmap(adapter->hw.hw_addr);
 504 err_ioremap:
 505         free_netdev(netdev);
 506 err_alloc_etherdev:
 507         pci_release_regions(pdev);
 508 err_request_regions:
 509 err_dma_mask:
 510         pci_disable_device(pdev);
 511         return err;
 512 }
 513
 514 /**
 515  * ixgb_remove - Device Removal Routine
 516  * @pdev: PCI device information struct
 517  *
 518  * ixgb_remove is called by the PCI subsystem to alert the driver
 519  * that it should release a PCI device.  The could be caused by a
 520  * Hot-Plug event, or because the driver is going to be removed from
 521  * memory.
 522  **/
 523
 524 static void __devexit
 525 ixgb_remove(struct pci_dev *pdev)
 526 {
 527         struct net_device *netdev = pci_get_drvdata(pdev);
 528         struct ixgb_adapter *adapter = netdev_priv(netdev);
 529
 530         cancel_work_sync(&adapter->tx_timeout_task);
 531
 532         unregister_netdev(netdev);
 533
 534         iounmap(adapter->hw.hw_addr);
 535         pci_release_regions(pdev);
 536
 537         free_netdev(netdev);
 538         pci_disable_device(pdev);
 539 }
 540
 541 /**
 542  * ixgb_sw_init - Initialize general software structures (struct ixgb_adapter)
 543  * @adapter: board private structure to initialize
 544  *
 545  * ixgb_sw_init initializes the Adapter private data structure.
 546  * Fields are initialized based on PCI device information and
 547  * OS network device settings (MTU size).
 548  **/
 549
 550 static int __devinit
 551 ixgb_sw_init(struct ixgb_adapter *adapter)
 552 {
 553         struct ixgb_hw *hw = &adapter->hw;
 554         struct net_device *netdev = adapter->netdev;
 555         struct pci_dev *pdev = adapter->pdev;
 556
 557         /* PCI config space info */
 558
 559         hw->vendor_id = pdev->vendor;
 560         hw->device_id = pdev->device;
 561         hw->subsystem_vendor_id = pdev->subsystem_vendor;
 562         hw->subsystem_id = pdev->subsystem_device;
 563
 564         hw->max_frame_size = netdev->mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;
 565         adapter->rx_buffer_len = hw->max_frame_size + 8; /* + 8 for errata */
 566
 567         if ((hw->device_id == IXGB_DEVICE_ID_82597EX) ||
 568             (hw->device_id == IXGB_DEVICE_ID_82597EX_CX4) ||
 569             (hw->device_id == IXGB_DEVICE_ID_82597EX_LR) ||
 570             (hw->device_id == IXGB_DEVICE_ID_82597EX_SR))
 571                 hw->mac_type = ixgb_82597;
 572         else {
 573                 /* should never have loaded on this device */
 574                 netif_err(adapter, probe, adapter->netdev, "unsupported device id\n");
 575         }
 576
 577         /* enable flow control to be programmed */
 578         hw->fc.send_xon = 1;
 579
 580         set_bit(__IXGB_DOWN, &adapter->flags);
 581         return 0;
 582 }
 583
 584 /**
 585  * ixgb_open - Called when a network interface is made active
 586  * @netdev: network interface device structure
 587  *
 588  * Returns 0 on success, negative value on failure
 589  *
 590  * The open entry point is called when a network interface is made
 591  * active by the system (IFF_UP).  At this point all resources needed
 592  * for transmit and receive operations are allocated, the interrupt
 593  * handler is registered with the OS, the watchdog timer is started,
 594  * and the stack is notified that the interface is ready.
 595  **/
 596
 597 static int
 598 ixgb_open(struct net_device *netdev)
 599 {
 600         struct ixgb_adapter *adapter = netdev_priv(netdev);
 601         int err;
 602
 603         /* allocate transmit descriptors */
 604         err = ixgb_setup_tx_resources(adapter);
 605         if (err)
 606                 goto err_setup_tx;
 607
 608         netif_carrier_off(netdev);
 609
 610         /* allocate receive descriptors */
 611
 612         err = ixgb_setup_rx_resources(adapter);
 613         if (err)
 614                 goto err_setup_rx;
 615
 616         err = ixgb_up(adapter);
 617         if (err)
 618                 goto err_up;
 619
 620         netif_start_queue(netdev);
 621
 622         return 0;
 623
 624 err_up:
 625         ixgb_free_rx_resources(adapter);
 626 err_setup_rx:
 627         ixgb_free_tx_resources(adapter);
 628 err_setup_tx:
 629         ixgb_reset(adapter);
 630
 631         return err;
 632 }
 633
 634 /**
 635  * ixgb_close - Disables a network interface
 636  * @netdev: network interface device structure
 637  *
 638  * Returns 0, this is not allowed to fail
 639  *
 640  * The close entry point is called when an interface is de-activated
 641  * by the OS.  The hardware is still under the drivers control, but
 642  * needs to be disabled.  A global MAC reset is issued to stop the
 643  * hardware, and all transmit and receive resources are freed.
 644  **/
 645
 646 static int
 647 ixgb_close(struct net_device *netdev)
 648 {
 649         struct ixgb_adapter *adapter = netdev_priv(netdev);
 650
 651         ixgb_down(adapter, true);
 652
 653         ixgb_free_tx_resources(adapter);
 654         ixgb_free_rx_resources(adapter);
 655
 656         return 0;
 657 }
 658
 659 /**
 660  * ixgb_setup_tx_resources - allocate Tx resources (Descriptors)
 661  * @adapter: board private structure
 662  *
 663  * Return 0 on success, negative on failure
 664  **/
 665
 666 int
 667 ixgb_setup_tx_resources(struct ixgb_adapter *adapter)
 668 {
 669         struct ixgb_desc_ring *txdr = &adapter->tx_ring;
 670         struct pci_dev *pdev = adapter->pdev;
 671         int size;
 672
 673         size = sizeof(struct ixgb_buffer) * txdr->count;
 674         txdr->buffer_info = vzalloc(size);
 675         if (!txdr->buffer_info) {
 676                 netif_err(adapter, probe, adapter->netdev,
 677                           "Unable to allocate transmit descriptor ring memory\n");
 678                 return -ENOMEM;
 679         }
 680
 681         /* round up to nearest 4K */
 682
 683         txdr->size = txdr->count * sizeof(struct ixgb_tx_desc);
 684         txdr->size = ALIGN(txdr->size, 4096);
 685
 686         txdr->desc = dma_alloc_coherent(&pdev->dev, txdr->size, &txdr->dma,
 687                                         GFP_KERNEL);
 688         if (!txdr->desc) {
 689                 vfree(txdr->buffer_info);
 690                 netif_err(adapter, probe, adapter->netdev,
 691                           "Unable to allocate transmit descriptor memory\n");
 692                 return -ENOMEM;
 693         }
 694         memset(txdr->desc, 0, txdr->size);
 695
 696         txdr->next_to_use = 0;
 697         txdr->next_to_clean = 0;
 698
 699         return 0;
 700 }
 701
 702 /**
 703  * ixgb_configure_tx - Configure 82597 Transmit Unit after Reset.
 704  * @adapter: board private structure
 705  *
 706  * Configure the Tx unit of the MAC after a reset.
 707  **/
 708
 709 static void
 710 ixgb_configure_tx(struct ixgb_adapter *adapter)
 711 {
 712         u64 tdba = adapter->tx_ring.dma;
 713         u32 tdlen = adapter->tx_ring.count * sizeof(struct ixgb_tx_desc);
 714         u32 tctl;
 715         struct ixgb_hw *hw = &adapter->hw;
 716
 717         /* Setup the Base and Length of the Tx Descriptor Ring
 718          * tx_ring.dma can be either a 32 or 64 bit value
 719          */
 720
 721         IXGB_WRITE_REG(hw, TDBAL, (tdba & 0x00000000ffffffffULL));
 722         IXGB_WRITE_REG(hw, TDBAH, (tdba >> 32));
 723
 724         IXGB_WRITE_REG(hw, TDLEN, tdlen);
 725
 726         /* Setup the HW Tx Head and Tail descriptor pointers */
 727
 728         IXGB_WRITE_REG(hw, TDH, 0);
 729         IXGB_WRITE_REG(hw, TDT, 0);
 730
 731         /* don't set up txdctl, it induces performance problems if configured
 732          * incorrectly */
 733         /* Set the Tx Interrupt Delay register */
 734
 735         IXGB_WRITE_REG(hw, TIDV, adapter->tx_int_delay);
 736
 737         /* Program the Transmit Control Register */
 738
 739         tctl = IXGB_TCTL_TCE | IXGB_TCTL_TXEN | IXGB_TCTL_TPDE;
 740         IXGB_WRITE_REG(hw, TCTL, tctl);
 741
 742         /* Setup Transmit Descriptor Settings for this adapter */
 743         adapter->tx_cmd_type =
 744                 IXGB_TX_DESC_TYPE |
 745                 (adapter->tx_int_delay_enable ? IXGB_TX_DESC_CMD_IDE : 0);
 746 }
 747
 748 /**
 749  * ixgb_setup_rx_resources - allocate Rx resources (Descriptors)
 750  * @adapter: board private structure
 751  *
 752  * Returns 0 on success, negative on failure
 753  **/
 754
 755 int
 756 ixgb_setup_rx_resources(struct ixgb_adapter *adapter)
 757 {
 758         struct ixgb_desc_ring *rxdr = &adapter->rx_ring;
 759         struct pci_dev *pdev = adapter->pdev;
 760         int size;
 761
 762         size = sizeof(struct ixgb_buffer) * rxdr->count;
 763         rxdr->buffer_info = vzalloc(size);
 764         if (!rxdr->buffer_info) {
 765                 netif_err(adapter, probe, adapter->netdev,
 766                           "Unable to allocate receive descriptor ring\n");
 767                 return -ENOMEM;
 768         }
 769
 770         /* Round up to nearest 4K */
 771
 772         rxdr->size = rxdr->count * sizeof(struct ixgb_rx_desc);
 773         rxdr->size = ALIGN(rxdr->size, 4096);
 774
 775         rxdr->desc = dma_alloc_coherent(&pdev->dev, rxdr->size, &rxdr->dma,
 776                                         GFP_KERNEL);
 777
 778         if (!rxdr->desc) {
 779                 vfree(rxdr->buffer_info);
 780                 netif_err(adapter, probe, adapter->netdev,
 781                           "Unable to allocate receive descriptors\n");
 782                 return -ENOMEM;
 783         }
 784         memset(rxdr->desc, 0, rxdr->size);
 785
 786         rxdr->next_to_clean = 0;
 787         rxdr->next_to_use = 0;
 788
 789         return 0;
 790 }
 791
 792 /**
 793  * ixgb_setup_rctl - configure the receive control register
 794  * @adapter: Board private structure
 795  **/
 796
 797 static void
 798 ixgb_setup_rctl(struct ixgb_adapter *adapter)
 799 {
 800         u32 rctl;
 801
 802         rctl = IXGB_READ_REG(&adapter->hw, RCTL);
 803
 804         rctl &= ~(3 << IXGB_RCTL_MO_SHIFT);
 805
 806         rctl |=
 807                 IXGB_RCTL_BAM | IXGB_RCTL_RDMTS_1_2 |
 808                 IXGB_RCTL_RXEN | IXGB_RCTL_CFF |
 809                 (adapter->hw.mc_filter_type << IXGB_RCTL_MO_SHIFT);
 810
 811         rctl |= IXGB_RCTL_SECRC;
 812
 813         if (adapter->rx_buffer_len <= IXGB_RXBUFFER_2048)
 814                 rctl |= IXGB_RCTL_BSIZE_2048;
 815         else if (adapter->rx_buffer_len <= IXGB_RXBUFFER_4096)
 816                 rctl |= IXGB_RCTL_BSIZE_4096;
 817         else if (adapter->rx_buffer_len <= IXGB_RXBUFFER_8192)
 818                 rctl |= IXGB_RCTL_BSIZE_8192;
 819         else if (adapter->rx_buffer_len <= IXGB_RXBUFFER_16384)
 820                 rctl |= IXGB_RCTL_BSIZE_16384;
 821
 822         IXGB_WRITE_REG(&adapter->hw, RCTL, rctl);
 823 }
 824
 825 /**
 826  * ixgb_configure_rx - Configure 82597 Receive Unit after Reset.
 827  * @adapter: board private structure
 828  *
 829  * Configure the Rx unit of the MAC after a reset.
 830  **/
 831
 832 static void
 833 ixgb_configure_rx(struct ixgb_adapter *adapter)
 834 {
 835         u64 rdba = adapter->rx_ring.dma;
 836         u32 rdlen = adapter->rx_ring.count * sizeof(struct ixgb_rx_desc);
 837         struct ixgb_hw *hw = &adapter->hw;
 838         u32 rctl;
 839         u32 rxcsum;
 840
 841         /* make sure receives are disabled while setting up the descriptors */
 842
 843         rctl = IXGB_READ_REG(hw, RCTL);
 844         IXGB_WRITE_REG(hw, RCTL, rctl & ~IXGB_RCTL_RXEN);
 845
 846         /* set the Receive Delay Timer Register */
 847
 848         IXGB_WRITE_REG(hw, RDTR, adapter->rx_int_delay);
 849
 850         /* Setup the Base and Length of the Rx Descriptor Ring */
 851
 852         IXGB_WRITE_REG(hw, RDBAL, (rdba & 0x00000000ffffffffULL));
 853         IXGB_WRITE_REG(hw, RDBAH, (rdba >> 32));
 854
 855         IXGB_WRITE_REG(hw, RDLEN, rdlen);
 856
 857         /* Setup the HW Rx Head and Tail Descriptor Pointers */
 858         IXGB_WRITE_REG(hw, RDH, 0);
 859         IXGB_WRITE_REG(hw, RDT, 0);
 860
 861         /* due to the hardware errata with RXDCTL, we are unable to use any of
 862          * the performance enhancing features of it without causing other
 863          * subtle bugs, some of the bugs could include receive length
 864          * corruption at high data rates (WTHRESH > 0) and/or receive
 865          * descriptor ring irregularites (particularly in hardware cache) */
 866         IXGB_WRITE_REG(hw, RXDCTL, 0);
 867
 868         /* Enable Receive Checksum Offload for TCP and UDP */
 869         if (adapter->rx_csum) {
 870                 rxcsum = IXGB_READ_REG(hw, RXCSUM);
 871                 rxcsum |= IXGB_RXCSUM_TUOFL;
 872                 IXGB_WRITE_REG(hw, RXCSUM, rxcsum);
 873         }
 874
 875         /* Enable Receives */
 876
 877         IXGB_WRITE_REG(hw, RCTL, rctl);
 878 }
 879
 880 /**
 881  * ixgb_free_tx_resources - Free Tx Resources
 882  * @adapter: board private structure
 883  *
 884  * Free all transmit software resources
 885  **/
 886
 887 void
 888 ixgb_free_tx_resources(struct ixgb_adapter *adapter)
 889 {
 890         struct pci_dev *pdev = adapter->pdev;
 891
 892         ixgb_clean_tx_ring(adapter);
 893
 894         vfree(adapter->tx_ring.buffer_info);
 895         adapter->tx_ring.buffer_info = NULL;
 896
 897         dma_free_coherent(&pdev->dev, adapter->tx_ring.size,
 898                           adapter->tx_ring.desc, adapter->tx_ring.dma);
 899
 900         adapter->tx_ring.desc = NULL;
 901 }
 902
 903 static void
 904 ixgb_unmap_and_free_tx_resource(struct ixgb_adapter *adapter,
 905                                 struct ixgb_buffer *buffer_info)
 906 {
 907         if (buffer_info->dma) {
 908                 if (buffer_info->mapped_as_page)
 909                         dma_unmap_page(&adapter->pdev->dev, buffer_info->dma,
 910                                        buffer_info->length, DMA_TO_DEVICE);
 911                 else
 912                         dma_unmap_single(&adapter->pdev->dev, buffer_info->dma,
 913                                          buffer_info->length, DMA_TO_DEVICE);
 914                 buffer_info->dma = 0;
 915         }
 916
 917         if (buffer_info->skb) {
 918                 dev_kfree_skb_any(buffer_info->skb);
 919                 buffer_info->skb = NULL;
 920         }
 921         buffer_info->time_stamp = 0;
 922         /* these fields must always be initialized in tx
 923          * buffer_info->length = 0;
 924          * buffer_info->next_to_watch = 0; */
 925 }
 926
 927 /**
 928  * ixgb_clean_tx_ring - Free Tx Buffers
 929  * @adapter: board private structure
 930  **/
 931
 932 static void
 933 ixgb_clean_tx_ring(struct ixgb_adapter *adapter)
 934 {
 935         struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
 936         struct ixgb_buffer *buffer_info;
 937         unsigned long size;
 938         unsigned int i;
 939
 940         /* Free all the Tx ring sk_buffs */
 941
 942         for (i = 0; i < tx_ring->count; i++) {
 943                 buffer_info = &tx_ring->buffer_info[i];
 944                 ixgb_unmap_and_free_tx_resource(adapter, buffer_info);
 945         }
 946
 947         size = sizeof(struct ixgb_buffer) * tx_ring->count;
 948         memset(tx_ring->buffer_info, 0, size);
 949
 950         /* Zero out the descriptor ring */
 951
 952         memset(tx_ring->desc, 0, tx_ring->size);
 953
 954         tx_ring->next_to_use = 0;
 955         tx_ring->next_to_clean = 0;
 956
 957         IXGB_WRITE_REG(&adapter->hw, TDH, 0);
 958         IXGB_WRITE_REG(&adapter->hw, TDT, 0);
 959 }
 960
 961 /**
 962  * ixgb_free_rx_resources - Free Rx Resources
 963  * @adapter: board private structure
 964  *
 965  * Free all receive software resources
 966  **/
 967
 968 void
 969 ixgb_free_rx_resources(struct ixgb_adapter *adapter)
 970 {
 971         struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
 972         struct pci_dev *pdev = adapter->pdev;
 973
 974         ixgb_clean_rx_ring(adapter);
 975
 976         vfree(rx_ring->buffer_info);
 977         rx_ring->buffer_info = NULL;
 978
 979         dma_free_coherent(&pdev->dev, rx_ring->size, rx_ring->desc,
 980                           rx_ring->dma);
 981
 982         rx_ring->desc = NULL;
 983 }
 984
 985 /**
 986  * ixgb_clean_rx_ring - Free Rx Buffers
 987  * @adapter: board private structure
 988  **/
 989
 990 static void
 991 ixgb_clean_rx_ring(struct ixgb_adapter *adapter)
 992 {
 993         struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
 994         struct ixgb_buffer *buffer_info;
 995         struct pci_dev *pdev = adapter->pdev;
 996         unsigned long size;
 997         unsigned int i;
 998
 999         /* Free all the Rx ring sk_buffs */
1000
1001         for (i = 0; i < rx_ring->count; i++) {
1002                 buffer_info = &rx_ring->buffer_info[i];
1003                 if (buffer_info->dma) {
1004                         dma_unmap_single(&pdev->dev,
1005                                          buffer_info->dma,
1006                                          buffer_info->length,
1007                                          DMA_FROM_DEVICE);
1008                         buffer_info->dma = 0;
1009                         buffer_info->length = 0;
1010                 }
1011
1012                 if (buffer_info->skb) {
1013                         dev_kfree_skb(buffer_info->skb);
1014                         buffer_info->skb = NULL;
1015                 }
1016         }
1017
1018         size = sizeof(struct ixgb_buffer) * rx_ring->count;
1019         memset(rx_ring->buffer_info, 0, size);
1020
1021         /* Zero out the descriptor ring */
1022
1023         memset(rx_ring->desc, 0, rx_ring->size);
1024
1025         rx_ring->next_to_clean = 0;
1026         rx_ring->next_to_use = 0;
1027
1028         IXGB_WRITE_REG(&adapter->hw, RDH, 0);
1029         IXGB_WRITE_REG(&adapter->hw, RDT, 0);
1030 }
1031
1032 /**
1033  * ixgb_set_mac - Change the Ethernet Address of the NIC
1034  * @netdev: network interface device structure
1035  * @p: pointer to an address structure
1036  *
1037  * Returns 0 on success, negative on failure
1038  **/
1039
1040 static int
1041 ixgb_set_mac(struct net_device *netdev, void *p)
1042 {
1043         struct ixgb_adapter *adapter = netdev_priv(netdev);
1044         struct sockaddr *addr = p;
1045
1046         if (!is_valid_ether_addr(addr->sa_data))
1047                 return -EADDRNOTAVAIL;
1048
1049         memcpy(netdev->dev_addr, addr->sa_data, netdev->addr_len);
1050
1051         ixgb_rar_set(&adapter->hw, addr->sa_data, 0);
1052
1053         return 0;
1054 }
1055
1056 /**
1057  * ixgb_set_multi - Multicast and Promiscuous mode set
1058  * @netdev: network interface device structure
1059  *
1060  * The set_multi entry point is called whenever the multicast address
1061  * list or the network interface flags are updated.  This routine is
1062  * responsible for configuring the hardware for proper multicast,
1063  * promiscuous mode, and all-multi behavior.
1064  **/
1065
1066 static void
1067 ixgb_set_multi(struct net_device *netdev)
1068 {
1069         struct ixgb_adapter *adapter = netdev_priv(netdev);
1070         struct ixgb_hw *hw = &adapter->hw;
1071         struct netdev_hw_addr *ha;
1072         u32 rctl;
1073         int i;
1074
1075         /* Check for Promiscuous and All Multicast modes */
1076
1077         rctl = IXGB_READ_REG(hw, RCTL);
1078
1079         if (netdev->flags & IFF_PROMISC) {
1080                 rctl |= (IXGB_RCTL_UPE | IXGB_RCTL_MPE);
1081                 /* disable VLAN filtering */
1082                 rctl &= ~IXGB_RCTL_CFIEN;
1083                 rctl &= ~IXGB_RCTL_VFE;
1084         } else {
1085                 if (netdev->flags & IFF_ALLMULTI) {
1086                         rctl |= IXGB_RCTL_MPE;
1087                         rctl &= ~IXGB_RCTL_UPE;
1088                 } else {
1089                         rctl &= ~(IXGB_RCTL_UPE | IXGB_RCTL_MPE);
1090                 }
1091                 /* enable VLAN filtering */
1092                 rctl |= IXGB_RCTL_VFE;
1093                 rctl &= ~IXGB_RCTL_CFIEN;
1094         }
1095
1096         if (netdev_mc_count(netdev) > IXGB_MAX_NUM_MULTICAST_ADDRESSES) {
1097                 rctl |= IXGB_RCTL_MPE;
1098                 IXGB_WRITE_REG(hw, RCTL, rctl);
1099         } else {
1100                 u8 mta[IXGB_MAX_NUM_MULTICAST_ADDRESSES *
1101                             IXGB_ETH_LENGTH_OF_ADDRESS];
1102
1103                 IXGB_WRITE_REG(hw, RCTL, rctl);
1104
1105                 i = 0;
1106                 netdev_for_each_mc_addr(ha, netdev)
1107                         memcpy(&mta[i++ * IXGB_ETH_LENGTH_OF_ADDRESS],
1108                                ha->addr, IXGB_ETH_LENGTH_OF_ADDRESS);
1109
1110                 ixgb_mc_addr_list_update(hw, mta, netdev_mc_count(netdev), 0);
1111         }
1112
1113         if (netdev->features & NETIF_F_HW_VLAN_RX)
1114                 ixgb_vlan_strip_enable(adapter);
1115         else
1116                 ixgb_vlan_strip_disable(adapter);
1117
1118 }
1119
1120 /**
1121  * ixgb_watchdog - Timer Call-back
1122  * @data: pointer to netdev cast into an unsigned long
1123  **/
1124
1125 static void
1126 ixgb_watchdog(unsigned long data)
1127 {
1128         struct ixgb_adapter *adapter = (struct ixgb_adapter *)data;
1129         struct net_device *netdev = adapter->netdev;
1130         struct ixgb_desc_ring *txdr = &adapter->tx_ring;
1131
1132         ixgb_check_for_link(&adapter->hw);
1133
1134         if (ixgb_check_for_bad_link(&adapter->hw)) {
1135                 /* force the reset path */
1136                 netif_stop_queue(netdev);
1137         }
1138
1139         if (adapter->hw.link_up) {
1140                 if (!netif_carrier_ok(netdev)) {
1141                         netdev_info(netdev,
1142                                     "NIC Link is Up 10 Gbps Full Duplex, Flow Control: %s\n",
1143                                     (adapter->hw.fc.type == ixgb_fc_full) ?
1144                                     "RX/TX" :
1145                                     (adapter->hw.fc.type == ixgb_fc_rx_pause) ?
1146                                      "RX" :
1147                                     (adapter->hw.fc.type == ixgb_fc_tx_pause) ?
1148                                     "TX" : "None");
1149                         adapter->link_speed = 10000;
1150                         adapter->link_duplex = FULL_DUPLEX;
1151                         netif_carrier_on(netdev);
1152                 }
1153         } else {
1154                 if (netif_carrier_ok(netdev)) {
1155                         adapter->link_speed = 0;
1156                         adapter->link_duplex = 0;
1157                         netdev_info(netdev, "NIC Link is Down\n");
1158                         netif_carrier_off(netdev);
1159                 }
1160         }
1161
1162         ixgb_update_stats(adapter);
1163
1164         if (!netif_carrier_ok(netdev)) {
1165                 if (IXGB_DESC_UNUSED(txdr) + 1 < txdr->count) {
1166                         /* We've lost link, so the controller stops DMA,
1167                          * but we've got queued Tx work that's never going
1168                          * to get done, so reset controller to flush Tx.
1169                          * (Do the reset outside of interrupt context). */
1170                         schedule_work(&adapter->tx_timeout_task);
1171                         /* return immediately since reset is imminent */
1172                         return;
1173                 }
1174         }
1175
1176         /* Force detection of hung controller every watchdog period */
1177         adapter->detect_tx_hung = true;
1178
1179         /* generate an interrupt to force clean up of any stragglers */
1180         IXGB_WRITE_REG(&adapter->hw, ICS, IXGB_INT_TXDW);
1181
1182         /* Reset the timer */
1183         mod_timer(&adapter->watchdog_timer, jiffies + 2 * HZ);
1184 }
1185
1186 #define IXGB_TX_FLAGS_CSUM              0x00000001
1187 #define IXGB_TX_FLAGS_VLAN              0x00000002
1188 #define IXGB_TX_FLAGS_TSO               0x00000004
1189
1190 static int
1191 ixgb_tso(struct ixgb_adapter *adapter, struct sk_buff *skb)
1192 {
1193         struct ixgb_context_desc *context_desc;
1194         unsigned int i;
1195         u8 ipcss, ipcso, tucss, tucso, hdr_len;
1196         u16 ipcse, tucse, mss;
1197         int err;
1198
1199         if (likely(skb_is_gso(skb))) {
1200                 struct ixgb_buffer *buffer_info;
1201                 struct iphdr *iph;
1202
1203                 if (skb_header_cloned(skb)) {
1204                         err = pskb_expand_head(skb, 0, 0, GFP_ATOMIC);
1205                         if (err)
1206                                 return err;
1207                 }
1208
1209                 hdr_len = skb_transport_offset(skb) + tcp_hdrlen(skb);
1210                 mss = skb_shinfo(skb)->gso_size;
1211                 iph = ip_hdr(skb);
1212                 iph->tot_len = 0;
1213                 iph->check = 0;
1214                 tcp_hdr(skb)->check = ~csum_tcpudp_magic(iph->saddr,
1215                                                          iph->daddr, 0,
1216                                                          IPPROTO_TCP, 0);
1217                 ipcss = skb_network_offset(skb);
1218                 ipcso = (void *)&(iph->check) - (void *)skb->data;
1219                 ipcse = skb_transport_offset(skb) - 1;
1220                 tucss = skb_transport_offset(skb);
1221                 tucso = (void *)&(tcp_hdr(skb)->check) - (void *)skb->data;
1222                 tucse = 0;
1223
1224                 i = adapter->tx_ring.next_to_use;
1225                 context_desc = IXGB_CONTEXT_DESC(adapter->tx_ring, i);
1226                 buffer_info = &adapter->tx_ring.buffer_info[i];
1227                 WARN_ON(buffer_info->dma != 0);
1228
1229                 context_desc->ipcss = ipcss;
1230                 context_desc->ipcso = ipcso;
1231                 context_desc->ipcse = cpu_to_le16(ipcse);
1232                 context_desc->tucss = tucss;
1233                 context_desc->tucso = tucso;
1234                 context_desc->tucse = cpu_to_le16(tucse);
1235                 context_desc->mss = cpu_to_le16(mss);
1236                 context_desc->hdr_len = hdr_len;
1237                 context_desc->status = 0;
1238                 context_desc->cmd_type_len = cpu_to_le32(
1239                                                   IXGB_CONTEXT_DESC_TYPE
1240                                                 | IXGB_CONTEXT_DESC_CMD_TSE
1241                                                 | IXGB_CONTEXT_DESC_CMD_IP
1242                                                 | IXGB_CONTEXT_DESC_CMD_TCP
1243                                                 | IXGB_CONTEXT_DESC_CMD_IDE
1244                                                 | (skb->len - (hdr_len)));
1245
1246
1247                 if (++i == adapter->tx_ring.count) i = 0;
1248                 adapter->tx_ring.next_to_use = i;
1249
1250                 return 1;
1251         }
1252
1253         return 0;
1254 }
1255
1256 static bool
1257 ixgb_tx_csum(struct ixgb_adapter *adapter, struct sk_buff *skb)
1258 {
1259         struct ixgb_context_desc *context_desc;
1260         unsigned int i;
1261         u8 css, cso;
1262
1263         if (likely(skb->ip_summed == CHECKSUM_PARTIAL)) {
1264                 struct ixgb_buffer *buffer_info;
1265                 css = skb_checksum_start_offset(skb);
1266                 cso = css + skb->csum_offset;
1267
1268                 i = adapter->tx_ring.next_to_use;
1269                 context_desc = IXGB_CONTEXT_DESC(adapter->tx_ring, i);
1270                 buffer_info = &adapter->tx_ring.buffer_info[i];
1271                 WARN_ON(buffer_info->dma != 0);
1272
1273                 context_desc->tucss = css;
1274                 context_desc->tucso = cso;
1275                 context_desc->tucse = 0;
1276                 /* zero out any previously existing data in one instruction */
1277                 *(u32 *)&(context_desc->ipcss) = 0;
1278                 context_desc->status = 0;
1279                 context_desc->hdr_len = 0;
1280                 context_desc->mss = 0;
1281                 context_desc->cmd_type_len =
1282                         cpu_to_le32(IXGB_CONTEXT_DESC_TYPE
1283                                     | IXGB_TX_DESC_CMD_IDE);
1284
1285                 if (++i == adapter->tx_ring.count) i = 0;
1286                 adapter->tx_ring.next_to_use = i;
1287
1288                 return true;
1289         }
1290
1291         return false;
1292 }
1293
1294 #define IXGB_MAX_TXD_PWR        14
1295 #define IXGB_MAX_DATA_PER_TXD   (1<<IXGB_MAX_TXD_PWR)
1296
1297 static int
1298 ixgb_tx_map(struct ixgb_adapter *adapter, struct sk_buff *skb,
1299             unsigned int first)
1300 {
1301         struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
1302         struct pci_dev *pdev = adapter->pdev;
1303         struct ixgb_buffer *buffer_info;
1304         int len = skb_headlen(skb);
1305         unsigned int offset = 0, size, count = 0, i;
1306         unsigned int mss = skb_shinfo(skb)->gso_size;
1307         unsigned int nr_frags = skb_shinfo(skb)->nr_frags;
1308         unsigned int f;
1309
1310         i = tx_ring->next_to_use;
1311
1312         while (len) {
1313                 buffer_info = &tx_ring->buffer_info[i];
1314                 size = min(len, IXGB_MAX_DATA_PER_TXD);
1315                 /* Workaround for premature desc write-backs
1316                  * in TSO mode.  Append 4-byte sentinel desc */
1317                 if (unlikely(mss && !nr_frags && size == len && size > 8))
1318                         size -= 4;
1319
1320                 buffer_info->length = size;
1321                 WARN_ON(buffer_info->dma != 0);
1322                 buffer_info->time_stamp = jiffies;
1323                 buffer_info->mapped_as_page = false;
1324                 buffer_info->dma = dma_map_single(&pdev->dev,
1325                                                   skb->data + offset,
1326                                                   size, DMA_TO_DEVICE);
1327                 if (dma_mapping_error(&pdev->dev, buffer_info->dma))
1328                         goto dma_error;
1329                 buffer_info->next_to_watch = 0;
1330
1331                 len -= size;
1332                 offset += size;
1333                 count++;
1334                 if (len) {
1335                         i++;
1336                         if (i == tx_ring->count)
1337                                 i = 0;
1338                 }
1339         }
1340
1341         for (f = 0; f < nr_frags; f++) {
1342                 struct skb_frag_struct *frag;
1343
1344                 frag = &skb_shinfo(skb)->frags[f];
1345                 len = frag->size;
1346                 offset = frag->page_offset;
1347
1348                 while (len) {
1349                         i++;
1350                         if (i == tx_ring->count)
1351                                 i = 0;
1352
1353                         buffer_info = &tx_ring->buffer_info[i];
1354                         size = min(len, IXGB_MAX_DATA_PER_TXD);
1355
1356                         /* Workaround for premature desc write-backs
1357                          * in TSO mode.  Append 4-byte sentinel desc */
1358                         if (unlikely(mss && (f == (nr_frags - 1))
1359                                      && size == len && size > 8))
1360                                 size -= 4;
1361
1362                         buffer_info->length = size;
1363                         buffer_info->time_stamp = jiffies;
1364                         buffer_info->mapped_as_page = true;
1365                         buffer_info->dma =
1366                                 dma_map_page(&pdev->dev, frag->page,
1367                                              offset, size, DMA_TO_DEVICE);
1368                         if (dma_mapping_error(&pdev->dev, buffer_info->dma))
1369                                 goto dma_error;
1370                         buffer_info->next_to_watch = 0;
1371
1372                         len -= size;
1373                         offset += size;
1374                         count++;
1375                 }
1376         }
1377         tx_ring->buffer_info[i].skb = skb;
1378         tx_ring->buffer_info[first].next_to_watch = i;
1379
1380         return count;
1381
1382 dma_error:
1383         dev_err(&pdev->dev, "TX DMA map failed\n");
1384         buffer_info->dma = 0;
1385         if (count)
1386                 count--;
1387
1388         while (count--) {
1389                 if (i==0)
1390                         i += tx_ring->count;
1391                 i--;
1392                 buffer_info = &tx_ring->buffer_info[i];
1393                 ixgb_unmap_and_free_tx_resource(adapter, buffer_info);
1394         }
1395
1396         return 0;
1397 }
1398
1399 static void
1400 ixgb_tx_queue(struct ixgb_adapter *adapter, int count, int vlan_id,int tx_flags)
1401 {
1402         struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
1403         struct ixgb_tx_desc *tx_desc = NULL;
1404         struct ixgb_buffer *buffer_info;
1405         u32 cmd_type_len = adapter->tx_cmd_type;
1406         u8 status = 0;
1407         u8 popts = 0;
1408         unsigned int i;
1409
1410         if (tx_flags & IXGB_TX_FLAGS_TSO) {
1411                 cmd_type_len |= IXGB_TX_DESC_CMD_TSE;
1412                 popts |= (IXGB_TX_DESC_POPTS_IXSM | IXGB_TX_DESC_POPTS_TXSM);
1413         }
1414
1415         if (tx_flags & IXGB_TX_FLAGS_CSUM)
1416                 popts |= IXGB_TX_DESC_POPTS_TXSM;
1417
1418         if (tx_flags & IXGB_TX_FLAGS_VLAN)
1419                 cmd_type_len |= IXGB_TX_DESC_CMD_VLE;
1420
1421         i = tx_ring->next_to_use;
1422
1423         while (count--) {
1424                 buffer_info = &tx_ring->buffer_info[i];
1425                 tx_desc = IXGB_TX_DESC(*tx_ring, i);
1426                 tx_desc->buff_addr = cpu_to_le64(buffer_info->dma);
1427                 tx_desc->cmd_type_len =
1428                         cpu_to_le32(cmd_type_len | buffer_info->length);
1429                 tx_desc->status = status;
1430                 tx_desc->popts = popts;
1431                 tx_desc->vlan = cpu_to_le16(vlan_id);
1432
1433                 if (++i == tx_ring->count) i = 0;
1434         }
1435
1436         tx_desc->cmd_type_len |=
1437                 cpu_to_le32(IXGB_TX_DESC_CMD_EOP | IXGB_TX_DESC_CMD_RS);
1438
1439         /* Force memory writes to complete before letting h/w
1440          * know there are new descriptors to fetch.  (Only
1441          * applicable for weak-ordered memory model archs,
1442          * such as IA-64). */
1443         wmb();
1444
1445         tx_ring->next_to_use = i;
1446         IXGB_WRITE_REG(&adapter->hw, TDT, i);
1447 }
1448
1449 static int __ixgb_maybe_stop_tx(struct net_device *netdev, int size)
1450 {
1451         struct ixgb_adapter *adapter = netdev_priv(netdev);
1452         struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
1453
1454         netif_stop_queue(netdev);
1455         /* Herbert's original patch had:
1456          *  smp_mb__after_netif_stop_queue();
1457          * but since that doesn't exist yet, just open code it. */
1458         smp_mb();
1459
1460         /* We need to check again in a case another CPU has just
1461          * made room available. */
1462         if (likely(IXGB_DESC_UNUSED(tx_ring) < size))
1463                 return -EBUSY;
1464
1465         /* A reprieve! */
1466         netif_start_queue(netdev);
1467         ++adapter->restart_queue;
1468         return 0;
1469 }
1470
1471 static int ixgb_maybe_stop_tx(struct net_device *netdev,
1472                               struct ixgb_desc_ring *tx_ring, int size)
1473 {
1474         if (likely(IXGB_DESC_UNUSED(tx_ring) >= size))
1475                 return 0;
1476         return __ixgb_maybe_stop_tx(netdev, size);
1477 }
1478
1479
1480 /* Tx Descriptors needed, worst case */
1481 #define TXD_USE_COUNT(S) (((S) >> IXGB_MAX_TXD_PWR) + \
1482                          (((S) & (IXGB_MAX_DATA_PER_TXD - 1)) ? 1 : 0))
1483 #define DESC_NEEDED TXD_USE_COUNT(IXGB_MAX_DATA_PER_TXD) /* skb->date */ + \
1484         MAX_SKB_FRAGS * TXD_USE_COUNT(PAGE_SIZE) + 1 /* for context */ \
1485         + 1 /* one more needed for sentinel TSO workaround */
1486
1487 static netdev_tx_t
1488 ixgb_xmit_frame(struct sk_buff *skb, struct net_device *netdev)
1489 {
1490         struct ixgb_adapter *adapter = netdev_priv(netdev);
1491         unsigned int first;
1492         unsigned int tx_flags = 0;
1493         int vlan_id = 0;
1494         int count = 0;
1495         int tso;
1496
1497         if (test_bit(__IXGB_DOWN, &adapter->flags)) {
1498                 dev_kfree_skb(skb);
1499                 return NETDEV_TX_OK;
1500         }
1501
1502         if (skb->len <= 0) {
1503                 dev_kfree_skb(skb);
1504                 return NETDEV_TX_OK;
1505         }
1506
1507         if (unlikely(ixgb_maybe_stop_tx(netdev, &adapter->tx_ring,
1508                      DESC_NEEDED)))
1509                 return NETDEV_TX_BUSY;
1510
1511         if (adapter->vlgrp && vlan_tx_tag_present(skb)) {
1512                 tx_flags |= IXGB_TX_FLAGS_VLAN;
1513                 vlan_id = vlan_tx_tag_get(skb);
1514         }
1515
1516         first = adapter->tx_ring.next_to_use;
1517
1518         tso = ixgb_tso(adapter, skb);
1519         if (tso < 0) {
1520                 dev_kfree_skb(skb);
1521                 return NETDEV_TX_OK;
1522         }
1523
1524         if (likely(tso))
1525                 tx_flags |= IXGB_TX_FLAGS_TSO;
1526         else if (ixgb_tx_csum(adapter, skb))
1527                 tx_flags |= IXGB_TX_FLAGS_CSUM;
1528
1529         count = ixgb_tx_map(adapter, skb, first);
1530
1531         if (count) {
1532                 ixgb_tx_queue(adapter, count, vlan_id, tx_flags);
1533                 /* Make sure there is space in the ring for the next send. */
1534                 ixgb_maybe_stop_tx(netdev, &adapter->tx_ring, DESC_NEEDED);
1535
1536         } else {
1537                 dev_kfree_skb_any(skb);
1538                 adapter->tx_ring.buffer_info[first].time_stamp = 0;
1539                 adapter->tx_ring.next_to_use = first;
1540         }
1541
1542         return NETDEV_TX_OK;
1543 }
1544
1545 /**
1546  * ixgb_tx_timeout - Respond to a Tx Hang
1547  * @netdev: network interface device structure
1548  **/
1549
1550 static void
1551 ixgb_tx_timeout(struct net_device *netdev)
1552 {
1553         struct ixgb_adapter *adapter = netdev_priv(netdev);
1554
1555         /* Do the reset outside of interrupt context */
1556         schedule_work(&adapter->tx_timeout_task);
1557 }
1558
1559 static void
1560 ixgb_tx_timeout_task(struct work_struct *work)
1561 {
1562         struct ixgb_adapter *adapter =
1563                 container_of(work, struct ixgb_adapter, tx_timeout_task);
1564
1565         adapter->tx_timeout_count++;
1566         ixgb_down(adapter, true);
1567         ixgb_up(adapter);
1568 }
1569
1570 /**
1571  * ixgb_get_stats - Get System Network Statistics
1572  * @netdev: network interface device structure
1573  *
1574  * Returns the address of the device statistics structure.
1575  * The statistics are actually updated from the timer callback.
1576  **/
1577
1578 static struct net_device_stats *
1579 ixgb_get_stats(struct net_device *netdev)
1580 {
1581         return &netdev->stats;
1582 }
1583
1584 /**
1585  * ixgb_change_mtu - Change the Maximum Transfer Unit
1586  * @netdev: network interface device structure
1587  * @new_mtu: new value for maximum frame size
1588  *
1589  * Returns 0 on success, negative on failure
1590  **/
1591
1592 static int
1593 ixgb_change_mtu(struct net_device *netdev, int new_mtu)
1594 {
1595         struct ixgb_adapter *adapter = netdev_priv(netdev);
1596         int max_frame = new_mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;
1597         int old_max_frame = netdev->mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;
1598
1599         /* MTU < 68 is an error for IPv4 traffic, just don't allow it */
1600         if ((new_mtu < 68) ||
1601             (max_frame > IXGB_MAX_JUMBO_FRAME_SIZE + ENET_FCS_LENGTH)) {
1602                 netif_err(adapter, probe, adapter->netdev,
1603                           "Invalid MTU setting %d\n", new_mtu);
1604                 return -EINVAL;
1605         }
1606
1607         if (old_max_frame == max_frame)
1608                 return 0;
1609
1610         if (netif_running(netdev))
1611                 ixgb_down(adapter, true);
1612
1613         adapter->rx_buffer_len = max_frame + 8; /* + 8 for errata */
1614
1615         netdev->mtu = new_mtu;
1616
1617         if (netif_running(netdev))
1618                 ixgb_up(adapter);
1619
1620         return 0;
1621 }
1622
1623 /**
1624  * ixgb_update_stats - Update the board statistics counters.
1625  * @adapter: board private structure
1626  **/
1627
1628 void
1629 ixgb_update_stats(struct ixgb_adapter *adapter)
1630 {
1631         struct net_device *netdev = adapter->netdev;
1632         struct pci_dev *pdev = adapter->pdev;
1633
1634         /* Prevent stats update while adapter is being reset */
1635         if (pci_channel_offline(pdev))
1636                 return;
1637
1638         if ((netdev->flags & IFF_PROMISC) || (netdev->flags & IFF_ALLMULTI) ||
1639            (netdev_mc_count(netdev) > IXGB_MAX_NUM_MULTICAST_ADDRESSES)) {
1640                 u64 multi = IXGB_READ_REG(&adapter->hw, MPRCL);
1641                 u32 bcast_l = IXGB_READ_REG(&adapter->hw, BPRCL);
1642                 u32 bcast_h = IXGB_READ_REG(&adapter->hw, BPRCH);
1643                 u64 bcast = ((u64)bcast_h << 32) | bcast_l;
1644
1645                 multi |= ((u64)IXGB_READ_REG(&adapter->hw, MPRCH) << 32);
1646                 /* fix up multicast stats by removing broadcasts */
1647                 if (multi >= bcast)
1648                         multi -= bcast;
1649
1650                 adapter->stats.mprcl += (multi & 0xFFFFFFFF);
1651                 adapter->stats.mprch += (multi >> 32);
1652                 adapter->stats.bprcl += bcast_l;
1653                 adapter->stats.bprch += bcast_h;
1654         } else {
1655                 adapter->stats.mprcl += IXGB_READ_REG(&adapter->hw, MPRCL);
1656                 adapter->stats.mprch += IXGB_READ_REG(&adapter->hw, MPRCH);
1657                 adapter->stats.bprcl += IXGB_READ_REG(&adapter->hw, BPRCL);
1658                 adapter->stats.bprch += IXGB_READ_REG(&adapter->hw, BPRCH);
1659         }
1660         adapter->stats.tprl += IXGB_READ_REG(&adapter->hw, TPRL);
1661         adapter->stats.tprh += IXGB_READ_REG(&adapter->hw, TPRH);
1662         adapter->stats.gprcl += IXGB_READ_REG(&adapter->hw, GPRCL);
1663         adapter->stats.gprch += IXGB_READ_REG(&adapter->hw, GPRCH);
1664         adapter->stats.uprcl += IXGB_READ_REG(&adapter->hw, UPRCL);
1665         adapter->stats.uprch += IXGB_READ_REG(&adapter->hw, UPRCH);
1666         adapter->stats.vprcl += IXGB_READ_REG(&adapter->hw, VPRCL);
1667         adapter->stats.vprch += IXGB_READ_REG(&adapter->hw, VPRCH);
1668         adapter->stats.jprcl += IXGB_READ_REG(&adapter->hw, JPRCL);
1669         adapter->stats.jprch += IXGB_READ_REG(&adapter->hw, JPRCH);
1670         adapter->stats.gorcl += IXGB_READ_REG(&adapter->hw, GORCL);
1671         adapter->stats.gorch += IXGB_READ_REG(&adapter->hw, GORCH);
1672         adapter->stats.torl += IXGB_READ_REG(&adapter->hw, TORL);
1673         adapter->stats.torh += IXGB_READ_REG(&adapter->hw, TORH);
1674         adapter->stats.rnbc += IXGB_READ_REG(&adapter->hw, RNBC);
1675         adapter->stats.ruc += IXGB_READ_REG(&adapter->hw, RUC);
1676         adapter->stats.roc += IXGB_READ_REG(&adapter->hw, ROC);
1677         adapter->stats.rlec += IXGB_READ_REG(&adapter->hw, RLEC);
1678         adapter->stats.crcerrs += IXGB_READ_REG(&adapter->hw, CRCERRS);
1679         adapter->stats.icbc += IXGB_READ_REG(&adapter->hw, ICBC);
1680         adapter->stats.ecbc += IXGB_READ_REG(&adapter->hw, ECBC);
1681         adapter->stats.mpc += IXGB_READ_REG(&adapter->hw, MPC);
1682         adapter->stats.tptl += IXGB_READ_REG(&adapter->hw, TPTL);
1683         adapter->stats.tpth += IXGB_READ_REG(&adapter->hw, TPTH);
1684         adapter->stats.gptcl += IXGB_READ_REG(&adapter->hw, GPTCL);
1685         adapter->stats.gptch += IXGB_READ_REG(&adapter->hw, GPTCH);
1686         adapter->stats.bptcl += IXGB_READ_REG(&adapter->hw, BPTCL);
1687         adapter->stats.bptch += IXGB_READ_REG(&adapter->hw, BPTCH);
1688         adapter->stats.mptcl += IXGB_READ_REG(&adapter->hw, MPTCL);
1689         adapter->stats.mptch += IXGB_READ_REG(&adapter->hw, MPTCH);
1690         adapter->stats.uptcl += IXGB_READ_REG(&adapter->hw, UPTCL);
1691         adapter->stats.uptch += IXGB_READ_REG(&adapter->hw, UPTCH);
1692         adapter->stats.vptcl += IXGB_READ_REG(&adapter->hw, VPTCL);
1693         adapter->stats.vptch += IXGB_READ_REG(&adapter->hw, VPTCH);
1694         adapter->stats.jptcl += IXGB_READ_REG(&adapter->hw, JPTCL);
1695         adapter->stats.jptch += IXGB_READ_REG(&adapter->hw, JPTCH);
1696         adapter->stats.gotcl += IXGB_READ_REG(&adapter->hw, GOTCL);
1697         adapter->stats.gotch += IXGB_READ_REG(&adapter->hw, GOTCH);
1698         adapter->stats.totl += IXGB_READ_REG(&adapter->hw, TOTL);
1699         adapter->stats.toth += IXGB_READ_REG(&adapter->hw, TOTH);
1700         adapter->stats.dc += IXGB_READ_REG(&adapter->hw, DC);
1701         adapter->stats.plt64c += IXGB_READ_REG(&adapter->hw, PLT64C);
1702         adapter->stats.tsctc += IXGB_READ_REG(&adapter->hw, TSCTC);
1703         adapter->stats.tsctfc += IXGB_READ_REG(&adapter->hw, TSCTFC);
1704         adapter->stats.ibic += IXGB_READ_REG(&adapter->hw, IBIC);
1705         adapter->stats.rfc += IXGB_READ_REG(&adapter->hw, RFC);
1706         adapter->stats.lfc += IXGB_READ_REG(&adapter->hw, LFC);
1707         adapter->stats.pfrc += IXGB_READ_REG(&adapter->hw, PFRC);
1708         adapter->stats.pftc += IXGB_READ_REG(&adapter->hw, PFTC);
1709         adapter->stats.mcfrc += IXGB_READ_REG(&adapter->hw, MCFRC);
1710         adapter->stats.mcftc += IXGB_READ_REG(&adapter->hw, MCFTC);
1711         adapter->stats.xonrxc += IXGB_READ_REG(&adapter->hw, XONRXC);
1712         adapter->stats.xontxc += IXGB_READ_REG(&adapter->hw, XONTXC);
1713         adapter->stats.xoffrxc += IXGB_READ_REG(&adapter->hw, XOFFRXC);
1714         adapter->stats.xofftxc += IXGB_READ_REG(&adapter->hw, XOFFTXC);
1715         adapter->stats.rjc += IXGB_READ_REG(&adapter->hw, RJC);
1716
1717         /* Fill out the OS statistics structure */
1718
1719         netdev->stats.rx_packets = adapter->stats.gprcl;
1720         netdev->stats.tx_packets = adapter->stats.gptcl;
1721         netdev->stats.rx_bytes = adapter->stats.gorcl;
1722         netdev->stats.tx_bytes = adapter->stats.gotcl;
1723         netdev->stats.multicast = adapter->stats.mprcl;
1724         netdev->stats.collisions = 0;
1725
1726         /* ignore RLEC as it reports errors for padded (<64bytes) frames
1727          * with a length in the type/len field */
1728         netdev->stats.rx_errors =
1729             /* adapter->stats.rnbc + */ adapter->stats.crcerrs +
1730             adapter->stats.ruc +
1731             adapter->stats.roc /*+ adapter->stats.rlec */  +
1732             adapter->stats.icbc +
1733             adapter->stats.ecbc + adapter->stats.mpc;
1734
1735         /* see above
1736          * netdev->stats.rx_length_errors = adapter->stats.rlec;
1737          */
1738
1739         netdev->stats.rx_crc_errors = adapter->stats.crcerrs;
1740         netdev->stats.rx_fifo_errors = adapter->stats.mpc;
1741         netdev->stats.rx_missed_errors = adapter->stats.mpc;
1742         netdev->stats.rx_over_errors = adapter->stats.mpc;
1743
1744         netdev->stats.tx_errors = 0;
1745         netdev->stats.rx_frame_errors = 0;
1746         netdev->stats.tx_aborted_errors = 0;
1747         netdev->stats.tx_carrier_errors = 0;
1748         netdev->stats.tx_fifo_errors = 0;
1749         netdev->stats.tx_heartbeat_errors = 0;
1750         netdev->stats.tx_window_errors = 0;
1751 }
1752
1753 #define IXGB_MAX_INTR 10
1754 /**
1755  * ixgb_intr - Interrupt Handler
1756  * @irq: interrupt number
1757  * @data: pointer to a network interface device structure
1758  **/
1759
1760 static irqreturn_t
1761 ixgb_intr(int irq, void *data)
1762 {
1763         struct net_device *netdev = data;
1764         struct ixgb_adapter *adapter = netdev_priv(netdev);
1765         struct ixgb_hw *hw = &adapter->hw;
1766         u32 icr = IXGB_READ_REG(hw, ICR);
1767
1768         if (unlikely(!icr))
1769                 return IRQ_NONE;  /* Not our interrupt */
1770
1771         if (unlikely(icr & (IXGB_INT_RXSEQ | IXGB_INT_LSC)))
1772                 if (!test_bit(__IXGB_DOWN, &adapter->flags))
1773                         mod_timer(&adapter->watchdog_timer, jiffies);
1774
1775         if (napi_schedule_prep(&adapter->napi)) {
1776
1777                 /* Disable interrupts and register for poll. The flush
1778                   of the posted write is intentionally left out.
1779                 */
1780
1781                 IXGB_WRITE_REG(&adapter->hw, IMC, ~0);
1782                 __napi_schedule(&adapter->napi);
1783         }
1784         return IRQ_HANDLED;
1785 }
1786
1787 /**
1788  * ixgb_clean - NAPI Rx polling callback
1789  * @adapter: board private structure
1790  **/
1791
1792 static int
1793 ixgb_clean(struct napi_struct *napi, int budget)
1794 {
1795         struct ixgb_adapter *adapter = container_of(napi, struct ixgb_adapter, napi);
1796         int work_done = 0;
1797
1798         ixgb_clean_tx_irq(adapter);
1799         ixgb_clean_rx_irq(adapter, &work_done, budget);
1800
1801         /* If budget not fully consumed, exit the polling mode */
1802         if (work_done < budget) {
1803                 napi_complete(napi);
1804                 if (!test_bit(__IXGB_DOWN, &adapter->flags))
1805                         ixgb_irq_enable(adapter);
1806         }
1807
1808         return work_done;
1809 }
1810
1811 /**
1812  * ixgb_clean_tx_irq - Reclaim resources after transmit completes
1813  * @adapter: board private structure
1814  **/
1815
1816 static bool
1817 ixgb_clean_tx_irq(struct ixgb_adapter *adapter)
1818 {
1819         struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
1820         struct net_device *netdev = adapter->netdev;
1821         struct ixgb_tx_desc *tx_desc, *eop_desc;
1822         struct ixgb_buffer *buffer_info;
1823         unsigned int i, eop;
1824         bool cleaned = false;
1825
1826         i = tx_ring->next_to_clean;
1827         eop = tx_ring->buffer_info[i].next_to_watch;
1828         eop_desc = IXGB_TX_DESC(*tx_ring, eop);
1829
1830         while (eop_desc->status & IXGB_TX_DESC_STATUS_DD) {
1831
1832                 rmb(); /* read buffer_info after eop_desc */
1833                 for (cleaned = false; !cleaned; ) {
1834                         tx_desc = IXGB_TX_DESC(*tx_ring, i);
1835                         buffer_info = &tx_ring->buffer_info[i];
1836
1837                         if (tx_desc->popts &
1838                            (IXGB_TX_DESC_POPTS_TXSM |
1839                             IXGB_TX_DESC_POPTS_IXSM))
1840                                 adapter->hw_csum_tx_good++;
1841
1842                         ixgb_unmap_and_free_tx_resource(adapter, buffer_info);
1843
1844                         *(u32 *)&(tx_desc->status) = 0;
1845
1846                         cleaned = (i == eop);
1847                         if (++i == tx_ring->count) i = 0;
1848                 }
1849
1850                 eop = tx_ring->buffer_info[i].next_to_watch;
1851                 eop_desc = IXGB_TX_DESC(*tx_ring, eop);
1852         }
1853
1854         tx_ring->next_to_clean = i;
1855
1856         if (unlikely(cleaned && netif_carrier_ok(netdev) &&
1857                      IXGB_DESC_UNUSED(tx_ring) >= DESC_NEEDED)) {
1858                 /* Make sure that anybody stopping the queue after this
1859                  * sees the new next_to_clean. */
1860                 smp_mb();
1861
1862                 if (netif_queue_stopped(netdev) &&
1863                     !(test_bit(__IXGB_DOWN, &adapter->flags))) {
1864                         netif_wake_queue(netdev);
1865                         ++adapter->restart_queue;
1866                 }
1867         }
1868
1869         if (adapter->detect_tx_hung) {
1870                 /* detect a transmit hang in hardware, this serializes the
1871                  * check with the clearing of time_stamp and movement of i */
1872                 adapter->detect_tx_hung = false;
1873                 if (tx_ring->buffer_info[eop].time_stamp &&
1874                    time_after(jiffies, tx_ring->buffer_info[eop].time_stamp + HZ)
1875                    && !(IXGB_READ_REG(&adapter->hw, STATUS) &
1876                         IXGB_STATUS_TXOFF)) {
1877                         /* detected Tx unit hang */
1878                         netif_err(adapter, drv, adapter->netdev,
1879                                   "Detected Tx Unit Hang\n"
1880                                   "  TDH                  <%x>\n"
1881                                   "  TDT                  <%x>\n"
1882                                   "  next_to_use          <%x>\n"
1883                                   "  next_to_clean        <%x>\n"
1884                                   "buffer_info[next_to_clean]\n"
1885                                   "  time_stamp           <%lx>\n"
1886                                   "  next_to_watch        <%x>\n"
1887                                   "  jiffies              <%lx>\n"
1888                                   "  next_to_watch.status <%x>\n",
1889                                   IXGB_READ_REG(&adapter->hw, TDH),
1890                                   IXGB_READ_REG(&adapter->hw, TDT),
1891                                   tx_ring->next_to_use,
1892                                   tx_ring->next_to_clean,
1893                                   tx_ring->buffer_info[eop].time_stamp,
1894                                   eop,
1895                                   jiffies,
1896                                   eop_desc->status);
1897                         netif_stop_queue(netdev);
1898                 }
1899         }
1900
1901         return cleaned;
1902 }
1903
1904 /**
1905  * ixgb_rx_checksum - Receive Checksum Offload for 82597.
1906  * @adapter: board private structure
1907  * @rx_desc: receive descriptor
1908  * @sk_buff: socket buffer with received data
1909  **/
1910
1911 static void
1912 ixgb_rx_checksum(struct ixgb_adapter *adapter,
1913                  struct ixgb_rx_desc *rx_desc,
1914                  struct sk_buff *skb)
1915 {
1916         /* Ignore Checksum bit is set OR
1917          * TCP Checksum has not been calculated
1918          */
1919         if ((rx_desc->status & IXGB_RX_DESC_STATUS_IXSM) ||
1920            (!(rx_desc->status & IXGB_RX_DESC_STATUS_TCPCS))) {
1921                 skb_checksum_none_assert(skb);
1922                 return;
1923         }
1924
1925         /* At this point we know the hardware did the TCP checksum */
1926         /* now look at the TCP checksum error bit */
1927         if (rx_desc->errors & IXGB_RX_DESC_ERRORS_TCPE) {
1928                 /* let the stack verify checksum errors */
1929                 skb_checksum_none_assert(skb);
1930                 adapter->hw_csum_rx_error++;
1931         } else {
1932                 /* TCP checksum is good */
1933                 skb->ip_summed = CHECKSUM_UNNECESSARY;
1934                 adapter->hw_csum_rx_good++;
1935         }
1936 }
1937
1938 /*
1939  * this should improve performance for small packets with large amounts
1940  * of reassembly being done in the stack
1941  */
1942 static void ixgb_check_copybreak(struct net_device *netdev,
1943                                  struct ixgb_buffer *buffer_info,
1944                                  u32 length, struct sk_buff **skb)
1945 {
1946         struct sk_buff *new_skb;
1947
1948         if (length > copybreak)
1949                 return;
1950
1951         new_skb = netdev_alloc_skb_ip_align(netdev, length);
1952         if (!new_skb)
1953                 return;
1954
1955         skb_copy_to_linear_data_offset(new_skb, -NET_IP_ALIGN,
1956                                        (*skb)->data - NET_IP_ALIGN,
1957                                        length + NET_IP_ALIGN);
1958         /* save the skb in buffer_info as good */
1959         buffer_info->skb = *skb;
1960         *skb = new_skb;
1961 }
1962
1963 /**
1964  * ixgb_clean_rx_irq - Send received data up the network stack,
1965  * @adapter: board private structure
1966  **/
1967
1968 static bool
1969 ixgb_clean_rx_irq(struct ixgb_adapter *adapter, int *work_done, int work_to_do)
1970 {
1971         struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
1972         struct net_device *netdev = adapter->netdev;
1973         struct pci_dev *pdev = adapter->pdev;
1974         struct ixgb_rx_desc *rx_desc, *next_rxd;
1975         struct ixgb_buffer *buffer_info, *next_buffer, *next2_buffer;
1976         u32 length;
1977         unsigned int i, j;
1978         int cleaned_count = 0;
1979         bool cleaned = false;
1980
1981         i = rx_ring->next_to_clean;
1982         rx_desc = IXGB_RX_DESC(*rx_ring, i);
1983         buffer_info = &rx_ring->buffer_info[i];
1984
1985         while (rx_desc->status & IXGB_RX_DESC_STATUS_DD) {
1986                 struct sk_buff *skb;
1987                 u8 status;
1988
1989                 if (*work_done >= work_to_do)
1990                         break;
1991
1992                 (*work_done)++;
1993                 rmb();  /* read descriptor and rx_buffer_info after status DD */
1994                 status = rx_desc->status;
1995                 skb = buffer_info->skb;
1996                 buffer_info->skb = NULL;
1997
1998                 prefetch(skb->data - NET_IP_ALIGN);
1999
2000                 if (++i == rx_ring->count)
2001                         i = 0;
2002                 next_rxd = IXGB_RX_DESC(*rx_ring, i);
2003                 prefetch(next_rxd);
2004
2005                 j = i + 1;
2006                 if (j == rx_ring->count)
2007                         j = 0;
2008                 next2_buffer = &rx_ring->buffer_info[j];
2009                 prefetch(next2_buffer);
2010
2011                 next_buffer = &rx_ring->buffer_info[i];
2012
2013                 cleaned = true;
2014                 cleaned_count++;
2015
2016                 dma_unmap_single(&pdev->dev,
2017                                  buffer_info->dma,
2018                                  buffer_info->length,
2019                                  DMA_FROM_DEVICE);
2020                 buffer_info->dma = 0;
2021
2022                 length = le16_to_cpu(rx_desc->length);
2023                 rx_desc->length = 0;
2024
2025                 if (unlikely(!(status & IXGB_RX_DESC_STATUS_EOP))) {
2026
2027                         /* All receives must fit into a single buffer */
2028
2029                         IXGB_DBG("Receive packet consumed multiple buffers "
2030                                          "length<%x>\n", length);
2031
2032                         dev_kfree_skb_irq(skb);
2033                         goto rxdesc_done;
2034                 }
2035
2036                 if (unlikely(rx_desc->errors &
2037                     (IXGB_RX_DESC_ERRORS_CE | IXGB_RX_DESC_ERRORS_SE |
2038                      IXGB_RX_DESC_ERRORS_P | IXGB_RX_DESC_ERRORS_RXE))) {
2039                         dev_kfree_skb_irq(skb);
2040                         goto rxdesc_done;
2041                 }
2042
2043                 ixgb_check_copybreak(netdev, buffer_info, length, &skb);
2044
2045                 /* Good Receive */
2046                 skb_put(skb, length);
2047
2048                 /* Receive Checksum Offload */
2049                 ixgb_rx_checksum(adapter, rx_desc, skb);
2050
2051                 skb->protocol = eth_type_trans(skb, netdev);
2052                 if (adapter->vlgrp && (status & IXGB_RX_DESC_STATUS_VP)) {
2053                         vlan_hwaccel_receive_skb(skb, adapter->vlgrp,
2054                                                 le16_to_cpu(rx_desc->special));
2055                 } else {
2056                         netif_receive_skb(skb);
2057                 }
2058
2059 rxdesc_done:
2060                 /* clean up descriptor, might be written over by hw */
2061                 rx_desc->status = 0;
2062
2063                 /* return some buffers to hardware, one at a time is too slow */
2064                 if (unlikely(cleaned_count >= IXGB_RX_BUFFER_WRITE)) {
2065                         ixgb_alloc_rx_buffers(adapter, cleaned_count);
2066                         cleaned_count = 0;
2067                 }
2068
2069                 /* use prefetched values */
2070                 rx_desc = next_rxd;
2071                 buffer_info = next_buffer;
2072         }
2073
2074         rx_ring->next_to_clean = i;
2075
2076         cleaned_count = IXGB_DESC_UNUSED(rx_ring);
2077         if (cleaned_count)
2078                 ixgb_alloc_rx_buffers(adapter, cleaned_count);
2079
2080         return cleaned;
2081 }
2082
2083 /**
2084  * ixgb_alloc_rx_buffers - Replace used receive buffers
2085  * @adapter: address of board private structure
2086  **/
2087
2088 static void
2089 ixgb_alloc_rx_buffers(struct ixgb_adapter *adapter, int cleaned_count)
2090 {
2091         struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
2092         struct net_device *netdev = adapter->netdev;
2093         struct pci_dev *pdev = adapter->pdev;
2094         struct ixgb_rx_desc *rx_desc;
2095         struct ixgb_buffer *buffer_info;
2096         struct sk_buff *skb;
2097         unsigned int i;
2098         long cleancount;
2099
2100         i = rx_ring->next_to_use;
2101         buffer_info = &rx_ring->buffer_info[i];
2102         cleancount = IXGB_DESC_UNUSED(rx_ring);
2103
2104
2105         /* leave three descriptors unused */
2106         while (--cleancount > 2 && cleaned_count--) {
2107                 /* recycle! its good for you */
2108                 skb = buffer_info->skb;
2109                 if (skb) {
2110                         skb_trim(skb, 0);
2111                         goto map_skb;
2112                 }
2113
2114                 skb = netdev_alloc_skb_ip_align(netdev, adapter->rx_buffer_len);
2115                 if (unlikely(!skb)) {
2116                         /* Better luck next round */
2117                         adapter->alloc_rx_buff_failed++;
2118                         break;
2119                 }
2120
2121                 buffer_info->skb = skb;
2122                 buffer_info->length = adapter->rx_buffer_len;
2123 map_skb:
2124                 buffer_info->dma = dma_map_single(&pdev->dev,
2125                                                   skb->data,
2126                                                   adapter->rx_buffer_len,
2127                                                   DMA_FROM_DEVICE);
2128
2129                 rx_desc = IXGB_RX_DESC(*rx_ring, i);
2130                 rx_desc->buff_addr = cpu_to_le64(buffer_info->dma);
2131                 /* guarantee DD bit not set now before h/w gets descriptor
2132                  * this is the rest of the workaround for h/w double
2133                  * writeback. */
2134                 rx_desc->status = 0;
2135
2136
2137                 if (++i == rx_ring->count) i = 0;
2138                 buffer_info = &rx_ring->buffer_info[i];
2139         }
2140
2141         if (likely(rx_ring->next_to_use != i)) {
2142                 rx_ring->next_to_use = i;
2143                 if (unlikely(i-- == 0))
2144                         i = (rx_ring->count - 1);
2145
2146                 /* Force memory writes to complete before letting h/w
2147                  * know there are new descriptors to fetch.  (Only
2148                  * applicable for weak-ordered memory model archs, such
2149                  * as IA-64). */
2150                 wmb();
2151                 IXGB_WRITE_REG(&adapter->hw, RDT, i);
2152         }
2153 }
2154
2155 /**
2156  * ixgb_vlan_rx_register - enables or disables vlan tagging/stripping.
2157  *
2158  * @param netdev network interface device structure
2159  * @param grp indicates to enable or disable tagging/stripping
2160  **/
2161 static void
2162 ixgb_vlan_rx_register(struct net_device *netdev, struct vlan_group *grp)
2163 {
2164         struct ixgb_adapter *adapter = netdev_priv(netdev);
2165
2166         adapter->vlgrp = grp;
2167 }
2168
2169 static void
2170 ixgb_vlan_strip_enable(struct ixgb_adapter *adapter)
2171 {
2172         u32 ctrl;
2173
2174         /* enable VLAN tag insert/strip */
2175         ctrl = IXGB_READ_REG(&adapter->hw, CTRL0);
2176         ctrl |= IXGB_CTRL0_VME;
2177         IXGB_WRITE_REG(&adapter->hw, CTRL0, ctrl);
2178 }
2179
2180 static void
2181 ixgb_vlan_strip_disable(struct ixgb_adapter *adapter)
2182 {
2183         u32 ctrl;
2184
2185         /* disable VLAN tag insert/strip */
2186         ctrl = IXGB_READ_REG(&adapter->hw, CTRL0);
2187         ctrl &= ~IXGB_CTRL0_VME;
2188         IXGB_WRITE_REG(&adapter->hw, CTRL0, ctrl);
2189 }
2190
2191 static void
2192 ixgb_vlan_rx_add_vid(struct net_device *netdev, u16 vid)
2193 {
2194         struct ixgb_adapter *adapter = netdev_priv(netdev);
2195         u32 vfta, index;
2196
2197         /* add VID to filter table */
2198
2199         index = (vid >> 5) & 0x7F;
2200         vfta = IXGB_READ_REG_ARRAY(&adapter->hw, VFTA, index);
2201         vfta |= (1 << (vid & 0x1F));
2202         ixgb_write_vfta(&adapter->hw, index, vfta);
2203 }
2204
2205 static void
2206 ixgb_vlan_rx_kill_vid(struct net_device *netdev, u16 vid)
2207 {
2208         struct ixgb_adapter *adapter = netdev_priv(netdev);
2209         u32 vfta, index;
2210
2211         ixgb_irq_disable(adapter);
2212
2213         vlan_group_set_device(adapter->vlgrp, vid, NULL);
2214
2215         /* don't enable interrupts unless we are UP */
2216         if (adapter->netdev->flags & IFF_UP)
2217                 ixgb_irq_enable(adapter);
2218
2219         /* remove VID from 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 }
2226
2227 static void
2228 ixgb_restore_vlan(struct ixgb_adapter *adapter)
2229 {
2230         ixgb_vlan_rx_register(adapter->netdev, adapter->vlgrp);
2231
2232         if (adapter->vlgrp) {
2233                 u16 vid;
2234                 for (vid = 0; vid < VLAN_N_VID; vid++) {
2235                         if (!vlan_group_get_device(adapter->vlgrp, vid))
2236                                 continue;
2237                         ixgb_vlan_rx_add_vid(adapter->netdev, vid);
2238                 }
2239         }
2240 }
2241
2242 #ifdef CONFIG_NET_POLL_CONTROLLER
2243 /*
2244  * Polling 'interrupt' - used by things like netconsole to send skbs
2245  * without having to re-enable interrupts. It's not called while
2246  * the interrupt routine is executing.
2247  */
2248
2249 static void ixgb_netpoll(struct net_device *dev)
2250 {
2251         struct ixgb_adapter *adapter = netdev_priv(dev);
2252
2253         disable_irq(adapter->pdev->irq);
2254         ixgb_intr(adapter->pdev->irq, dev);
2255         enable_irq(adapter->pdev->irq);
2256 }
2257 #endif
2258
2259 /**
2260  * ixgb_io_error_detected() - called when PCI error is detected
2261  * @pdev    pointer to pci device with error
2262  * @state   pci channel state after error
2263  *
2264  * This callback is called by the PCI subsystem whenever
2265  * a PCI bus error is detected.
2266  */
2267 static pci_ers_result_t ixgb_io_error_detected(struct pci_dev *pdev,
2268                                                enum pci_channel_state state)
2269 {
2270         struct net_device *netdev = pci_get_drvdata(pdev);
2271         struct ixgb_adapter *adapter = netdev_priv(netdev);
2272
2273         netif_device_detach(netdev);
2274
2275         if (state == pci_channel_io_perm_failure)
2276                 return PCI_ERS_RESULT_DISCONNECT;
2277
2278         if (netif_running(netdev))
2279                 ixgb_down(adapter, true);
2280
2281         pci_disable_device(pdev);
2282
2283         /* Request a slot reset. */
2284         return PCI_ERS_RESULT_NEED_RESET;
2285 }
2286
2287 /**
2288  * ixgb_io_slot_reset - called after the pci bus has been reset.
2289  * @pdev    pointer to pci device with error
2290  *
2291  * This callback is called after the PCI bus has been reset.
2292  * Basically, this tries to restart the card from scratch.
2293  * This is a shortened version of the device probe/discovery code,
2294  * it resembles the first-half of the ixgb_probe() routine.
2295  */
2296 static pci_ers_result_t ixgb_io_slot_reset(struct pci_dev *pdev)
2297 {
2298         struct net_device *netdev = pci_get_drvdata(pdev);
2299         struct ixgb_adapter *adapter = netdev_priv(netdev);
2300
2301         if (pci_enable_device(pdev)) {
2302                 netif_err(adapter, probe, adapter->netdev,
2303                           "Cannot re-enable PCI device after reset\n");
2304                 return PCI_ERS_RESULT_DISCONNECT;
2305         }
2306
2307         /* Perform card reset only on one instance of the card */
2308         if (0 != PCI_FUNC (pdev->devfn))
2309                 return PCI_ERS_RESULT_RECOVERED;
2310
2311         pci_set_master(pdev);
2312
2313         netif_carrier_off(netdev);
2314         netif_stop_queue(netdev);
2315         ixgb_reset(adapter);
2316
2317         /* Make sure the EEPROM is good */
2318         if (!ixgb_validate_eeprom_checksum(&adapter->hw)) {
2319                 netif_err(adapter, probe, adapter->netdev,
2320                           "After reset, the EEPROM checksum is not valid\n");
2321                 return PCI_ERS_RESULT_DISCONNECT;
2322         }
2323         ixgb_get_ee_mac_addr(&adapter->hw, netdev->dev_addr);
2324         memcpy(netdev->perm_addr, netdev->dev_addr, netdev->addr_len);
2325
2326         if (!is_valid_ether_addr(netdev->perm_addr)) {
2327                 netif_err(adapter, probe, adapter->netdev,
2328                           "After reset, invalid MAC address\n");
2329                 return PCI_ERS_RESULT_DISCONNECT;
2330         }
2331
2332         return PCI_ERS_RESULT_RECOVERED;
2333 }
2334
2335 /**
2336  * ixgb_io_resume - called when its OK to resume normal operations
2337  * @pdev    pointer to pci device with error
2338  *
2339  * The error recovery driver tells us that its OK to resume
2340  * normal operation. Implementation resembles the second-half
2341  * of the ixgb_probe() routine.
2342  */
2343 static void ixgb_io_resume(struct pci_dev *pdev)
2344 {
2345         struct net_device *netdev = pci_get_drvdata(pdev);
2346         struct ixgb_adapter *adapter = netdev_priv(netdev);
2347
2348         pci_set_master(pdev);
2349
2350         if (netif_running(netdev)) {
2351                 if (ixgb_up(adapter)) {
2352                         pr_err("can't bring device back up after reset\n");
2353                         return;
2354                 }
2355         }
2356
2357         netif_device_attach(netdev);
2358         mod_timer(&adapter->watchdog_timer, jiffies);
2359 }
2360
2361 /* ixgb_main.c */