Pileus Git - ~andy/linux/blob - drivers/net/ethernet/intel/ixgb/ixgb_main.c

   1 /*******************************************************************************
   2
   3   Intel PRO/10GbE Linux driver
   4   Copyright(c) 1999 - 2008 Intel Corporation.
   5
   6   This program is free software; you can redistribute it and/or modify it
   7   under the terms and conditions of the GNU General Public License,
   8   version 2, as published by the Free Software Foundation.
   9
  10   This program is distributed in the hope it will be useful, but WITHOUT
  11   ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  12   FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  13   more details.
  14
  15   You should have received a copy of the GNU General Public License along with
  16   this program; if not, write to the Free Software Foundation, Inc.,
  17   51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
  18
  19   The full GNU General Public License is included in this distribution in
  20   the file called "COPYING".
  21
  22   Contact Information:
  23   Linux NICS <linux.nics@intel.com>
  24   e1000-devel Mailing List <e1000-devel@lists.sourceforge.net>
  25   Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
  26
  27 *******************************************************************************/
  28
  29 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  30
  31 #include <linux/prefetch.h>
  32 #include "ixgb.h"
  33
  34 char ixgb_driver_name[] = "ixgb";
  35 static char ixgb_driver_string[] = "Intel(R) PRO/10GbE Network Driver";
  36
  37 #define DRIVERNAPI "-NAPI"
  38 #define DRV_VERSION "1.0.135-k2" DRIVERNAPI
  39 const char ixgb_driver_version[] = DRV_VERSION;
  40 static const char ixgb_copyright[] = "Copyright (c) 1999-2008 Intel Corporation.";
  41
  42 #define IXGB_CB_LENGTH 256
  43 static unsigned int copybreak __read_mostly = IXGB_CB_LENGTH;
  44 module_param(copybreak, uint, 0644);
  45 MODULE_PARM_DESC(copybreak,
  46         "Maximum size of packet that is copied to a new buffer on receive");
  47
  48 /* ixgb_pci_tbl - PCI Device ID Table
  49  *
  50  * Wildcard entries (PCI_ANY_ID) should come last
  51  * Last entry must be all 0s
  52  *
  53  * { Vendor ID, Device ID, SubVendor ID, SubDevice ID,
  54  *   Class, Class Mask, private data (not used) }
  55  */
  56 static DEFINE_PCI_DEVICE_TABLE(ixgb_pci_tbl) = {
  57         {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
  70 MODULE_DEVICE_TABLE(pci, ixgb_pci_tbl);
  71
  72 /* Local Function Prototypes */
  73 static int ixgb_init_module(void);
  74 static void ixgb_exit_module(void);
  75 static int ixgb_probe(struct pci_dev *pdev, const struct pci_device_id *ent);
  76 static void ixgb_remove(struct pci_dev *pdev);
  77 static int ixgb_sw_init(struct ixgb_adapter *adapter);
  78 static int ixgb_open(struct net_device *netdev);
  79 static int ixgb_close(struct net_device *netdev);
  80 static void ixgb_configure_tx(struct ixgb_adapter *adapter);
  81 static void ixgb_configure_rx(struct ixgb_adapter *adapter);
  82 static void ixgb_setup_rctl(struct ixgb_adapter *adapter);
  83 static void ixgb_clean_tx_ring(struct ixgb_adapter *adapter);
  84 static void ixgb_clean_rx_ring(struct ixgb_adapter *adapter);
  85 static void ixgb_set_multi(struct net_device *netdev);
  86 static void ixgb_watchdog(unsigned long data);
  87 static netdev_tx_t ixgb_xmit_frame(struct sk_buff *skb,
  88                                    struct net_device *netdev);
  89 static struct net_device_stats *ixgb_get_stats(struct net_device *netdev);
  90 static int ixgb_change_mtu(struct net_device *netdev, int new_mtu);
  91 static int ixgb_set_mac(struct net_device *netdev, void *p);
  92 static irqreturn_t ixgb_intr(int irq, void *data);
  93 static bool ixgb_clean_tx_irq(struct ixgb_adapter *adapter);
  94
  95 static int ixgb_clean(struct napi_struct *, int);
  96 static bool ixgb_clean_rx_irq(struct ixgb_adapter *, int *, int);
  97 static void ixgb_alloc_rx_buffers(struct ixgb_adapter *, int);
  98
  99 static void ixgb_tx_timeout(struct net_device *dev);
 100 static void ixgb_tx_timeout_task(struct work_struct *work);
 101
 102 static void ixgb_vlan_strip_enable(struct ixgb_adapter *adapter);
 103 static void ixgb_vlan_strip_disable(struct ixgb_adapter *adapter);
 104 static int ixgb_vlan_rx_add_vid(struct net_device *netdev, u16 vid);
 105 static int ixgb_vlan_rx_kill_vid(struct net_device *netdev, u16 vid);
 106 static void ixgb_restore_vlan(struct ixgb_adapter *adapter);
 107
 108 #ifdef CONFIG_NET_POLL_CONTROLLER
 109 /* for netdump / net console */
 110 static void ixgb_netpoll(struct net_device *dev);
 111 #endif
 112
 113 static pci_ers_result_t ixgb_io_error_detected (struct pci_dev *pdev,
 114                              enum pci_channel_state state);
 115 static pci_ers_result_t ixgb_io_slot_reset (struct pci_dev *pdev);
 116 static void ixgb_io_resume (struct pci_dev *pdev);
 117
 118 static const struct pci_error_handlers ixgb_err_handler = {
 119         .error_detected = ixgb_io_error_detected,
 120         .slot_reset = ixgb_io_slot_reset,
 121         .resume = ixgb_io_resume,
 122 };
 123
 124 static struct pci_driver ixgb_driver = {
 125         .name     = ixgb_driver_name,
 126         .id_table = ixgb_pci_tbl,
 127         .probe    = ixgb_probe,
 128         .remove   = ixgb_remove,
 129         .err_handler = &ixgb_err_handler
 130 };
 131
 132 MODULE_AUTHOR("Intel Corporation, <linux.nics@intel.com>");
 133 MODULE_DESCRIPTION("Intel(R) PRO/10GbE Network Driver");
 134 MODULE_LICENSE("GPL");
 135 MODULE_VERSION(DRV_VERSION);
 136
 137 #define DEFAULT_MSG_ENABLE (NETIF_MSG_DRV|NETIF_MSG_PROBE|NETIF_MSG_LINK)
 138 static int debug = -1;
 139 module_param(debug, int, 0);
 140 MODULE_PARM_DESC(debug, "Debug level (0=none,...,16=all)");
 141
 142 /**
 143  * ixgb_init_module - Driver Registration Routine
 144  *
 145  * ixgb_init_module is the first routine called when the driver is
 146  * loaded. All it does is register with the PCI subsystem.
 147  **/
 148
 149 static int __init
 150 ixgb_init_module(void)
 151 {
 152         pr_info("%s - version %s\n", ixgb_driver_string, ixgb_driver_version);
 153         pr_info("%s\n", ixgb_copyright);
 154
 155         return pci_register_driver(&ixgb_driver);
 156 }
 157
 158 module_init(ixgb_init_module);
 159
 160 /**
 161  * ixgb_exit_module - Driver Exit Cleanup Routine
 162  *
 163  * ixgb_exit_module is called just before the driver is removed
 164  * from memory.
 165  **/
 166
 167 static void __exit
 168 ixgb_exit_module(void)
 169 {
 170         pci_unregister_driver(&ixgb_driver);
 171 }
 172
 173 module_exit(ixgb_exit_module);
 174
 175 /**
 176  * ixgb_irq_disable - Mask off interrupt generation on the NIC
 177  * @adapter: board private structure
 178  **/
 179
 180 static void
 181 ixgb_irq_disable(struct ixgb_adapter *adapter)
 182 {
 183         IXGB_WRITE_REG(&adapter->hw, IMC, ~0);
 184         IXGB_WRITE_FLUSH(&adapter->hw);
 185         synchronize_irq(adapter->pdev->irq);
 186 }
 187
 188 /**
 189  * ixgb_irq_enable - Enable default interrupt generation settings
 190  * @adapter: board private structure
 191  **/
 192
 193 static void
 194 ixgb_irq_enable(struct ixgb_adapter *adapter)
 195 {
 196         u32 val = IXGB_INT_RXT0 | IXGB_INT_RXDMT0 |
 197                   IXGB_INT_TXDW | IXGB_INT_LSC;
 198         if (adapter->hw.subsystem_vendor_id == PCI_VENDOR_ID_SUN)
 199                 val |= IXGB_INT_GPI0;
 200         IXGB_WRITE_REG(&adapter->hw, IMS, val);
 201         IXGB_WRITE_FLUSH(&adapter->hw);
 202 }
 203
 204 int
 205 ixgb_up(struct ixgb_adapter *adapter)
 206 {
 207         struct net_device *netdev = adapter->netdev;
 208         int err, irq_flags = IRQF_SHARED;
 209         int max_frame = netdev->mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;
 210         struct ixgb_hw *hw = &adapter->hw;
 211
 212         /* hardware has been reset, we need to reload some things */
 213
 214         ixgb_rar_set(hw, netdev->dev_addr, 0);
 215         ixgb_set_multi(netdev);
 216
 217         ixgb_restore_vlan(adapter);
 218
 219         ixgb_configure_tx(adapter);
 220         ixgb_setup_rctl(adapter);
 221         ixgb_configure_rx(adapter);
 222         ixgb_alloc_rx_buffers(adapter, IXGB_DESC_UNUSED(&adapter->rx_ring));
 223
 224         /* disable interrupts and get the hardware into a known state */
 225         IXGB_WRITE_REG(&adapter->hw, IMC, 0xffffffff);
 226
 227         /* only enable MSI if bus is in PCI-X mode */
 228         if (IXGB_READ_REG(&adapter->hw, STATUS) & IXGB_STATUS_PCIX_MODE) {
 229                 err = pci_enable_msi(adapter->pdev);
 230                 if (!err) {
 231                         adapter->have_msi = true;
 232                         irq_flags = 0;
 233                 }
 234                 /* proceed to try to request regular interrupt */
 235         }
 236
 237         err = request_irq(adapter->pdev->irq, ixgb_intr, irq_flags,
 238                           netdev->name, netdev);
 239         if (err) {
 240                 if (adapter->have_msi)
 241                         pci_disable_msi(adapter->pdev);
 242                 netif_err(adapter, probe, adapter->netdev,
 243                           "Unable to allocate interrupt Error: %d\n", err);
 244                 return err;
 245         }
 246
 247         if ((hw->max_frame_size != max_frame) ||
 248                 (hw->max_frame_size !=
 249                 (IXGB_READ_REG(hw, MFS) >> IXGB_MFS_SHIFT))) {
 250
 251                 hw->max_frame_size = max_frame;
 252
 253                 IXGB_WRITE_REG(hw, MFS, hw->max_frame_size << IXGB_MFS_SHIFT);
 254
 255                 if (hw->max_frame_size >
 256                    IXGB_MAX_ENET_FRAME_SIZE_WITHOUT_FCS + ENET_FCS_LENGTH) {
 257                         u32 ctrl0 = IXGB_READ_REG(hw, CTRL0);
 258
 259                         if (!(ctrl0 & IXGB_CTRL0_JFE)) {
 260                                 ctrl0 |= IXGB_CTRL0_JFE;
 261                                 IXGB_WRITE_REG(hw, CTRL0, ctrl0);
 262                         }
 263                 }
 264         }
 265
 266         clear_bit(__IXGB_DOWN, &adapter->flags);
 267
 268         napi_enable(&adapter->napi);
 269         ixgb_irq_enable(adapter);
 270
 271         netif_wake_queue(netdev);
 272
 273         mod_timer(&adapter->watchdog_timer, jiffies);
 274
 275         return 0;
 276 }
 277
 278 void
 279 ixgb_down(struct ixgb_adapter *adapter, bool kill_watchdog)
 280 {
 281         struct net_device *netdev = adapter->netdev;
 282
 283         /* prevent the interrupt handler from restarting watchdog */
 284         set_bit(__IXGB_DOWN, &adapter->flags);
 285
 286         napi_disable(&adapter->napi);
 287         /* waiting for NAPI to complete can re-enable interrupts */
 288         ixgb_irq_disable(adapter);
 289         free_irq(adapter->pdev->irq, netdev);
 290
 291         if (adapter->have_msi)
 292                 pci_disable_msi(adapter->pdev);
 293
 294         if (kill_watchdog)
 295                 del_timer_sync(&adapter->watchdog_timer);
 296
 297         adapter->link_speed = 0;
 298         adapter->link_duplex = 0;
 299         netif_carrier_off(netdev);
 300         netif_stop_queue(netdev);
 301
 302         ixgb_reset(adapter);
 303         ixgb_clean_tx_ring(adapter);
 304         ixgb_clean_rx_ring(adapter);
 305 }
 306
 307 void
 308 ixgb_reset(struct ixgb_adapter *adapter)
 309 {
 310         struct ixgb_hw *hw = &adapter->hw;
 311
 312         ixgb_adapter_stop(hw);
 313         if (!ixgb_init_hw(hw))
 314                 netif_err(adapter, probe, adapter->netdev, "ixgb_init_hw failed\n");
 315
 316         /* restore frame size information */
 317         IXGB_WRITE_REG(hw, MFS, hw->max_frame_size << IXGB_MFS_SHIFT);
 318         if (hw->max_frame_size >
 319             IXGB_MAX_ENET_FRAME_SIZE_WITHOUT_FCS + ENET_FCS_LENGTH) {
 320                 u32 ctrl0 = IXGB_READ_REG(hw, CTRL0);
 321                 if (!(ctrl0 & IXGB_CTRL0_JFE)) {
 322                         ctrl0 |= IXGB_CTRL0_JFE;
 323                         IXGB_WRITE_REG(hw, CTRL0, ctrl0);
 324                 }
 325         }
 326 }
 327
 328 static netdev_features_t
 329 ixgb_fix_features(struct net_device *netdev, netdev_features_t features)
 330 {
 331         /*
 332          * Tx VLAN insertion does not work per HW design when Rx stripping is
 333          * disabled.
 334          */
 335         if (!(features & NETIF_F_HW_VLAN_RX))
 336                 features &= ~NETIF_F_HW_VLAN_TX;
 337
 338         return features;
 339 }
 340
 341 static int
 342 ixgb_set_features(struct net_device *netdev, netdev_features_t features)
 343 {
 344         struct ixgb_adapter *adapter = netdev_priv(netdev);
 345         netdev_features_t changed = features ^ netdev->features;
 346
 347         if (!(changed & (NETIF_F_RXCSUM|NETIF_F_HW_VLAN_RX)))
 348                 return 0;
 349
 350         adapter->rx_csum = !!(features & NETIF_F_RXCSUM);
 351
 352         if (netif_running(netdev)) {
 353                 ixgb_down(adapter, true);
 354                 ixgb_up(adapter);
 355                 ixgb_set_speed_duplex(netdev);
 356         } else
 357                 ixgb_reset(adapter);
 358
 359         return 0;
 360 }
 361
 362
 363 static const struct net_device_ops ixgb_netdev_ops = {
 364         .ndo_open               = ixgb_open,
 365         .ndo_stop               = ixgb_close,
 366         .ndo_start_xmit         = ixgb_xmit_frame,
 367         .ndo_get_stats          = ixgb_get_stats,
 368         .ndo_set_rx_mode        = ixgb_set_multi,
 369         .ndo_validate_addr      = eth_validate_addr,
 370         .ndo_set_mac_address    = ixgb_set_mac,
 371         .ndo_change_mtu         = ixgb_change_mtu,
 372         .ndo_tx_timeout         = ixgb_tx_timeout,
 373         .ndo_vlan_rx_add_vid    = ixgb_vlan_rx_add_vid,
 374         .ndo_vlan_rx_kill_vid   = ixgb_vlan_rx_kill_vid,
 375 #ifdef CONFIG_NET_POLL_CONTROLLER
 376         .ndo_poll_controller    = ixgb_netpoll,
 377 #endif
 378         .ndo_fix_features       = ixgb_fix_features,
 379         .ndo_set_features       = ixgb_set_features,
 380 };
 381
 382 /**
 383  * ixgb_probe - Device Initialization Routine
 384  * @pdev: PCI device information struct
 385  * @ent: entry in ixgb_pci_tbl
 386  *
 387  * Returns 0 on success, negative on failure
 388  *
 389  * ixgb_probe initializes an adapter identified by a pci_dev structure.
 390  * The OS initialization, configuring of the adapter private structure,
 391  * and a hardware reset occur.
 392  **/
 393
 394 static int
 395 ixgb_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
 396 {
 397         struct net_device *netdev = NULL;
 398         struct ixgb_adapter *adapter;
 399         static int cards_found = 0;
 400         int pci_using_dac;
 401         int i;
 402         int err;
 403
 404         err = pci_enable_device(pdev);
 405         if (err)
 406                 return err;
 407
 408         pci_using_dac = 0;
 409         err = dma_set_mask(&pdev->dev, DMA_BIT_MASK(64));
 410         if (!err) {
 411                 err = dma_set_coherent_mask(&pdev->dev, DMA_BIT_MASK(64));
 412                 if (!err)
 413                         pci_using_dac = 1;
 414         } else {
 415                 err = dma_set_mask(&pdev->dev, DMA_BIT_MASK(32));
 416                 if (err) {
 417                         err = dma_set_coherent_mask(&pdev->dev,
 418                                                     DMA_BIT_MASK(32));
 419                         if (err) {
 420                                 pr_err("No usable DMA configuration, aborting\n");
 421                                 goto err_dma_mask;
 422                         }
 423                 }
 424         }
 425
 426         err = pci_request_regions(pdev, ixgb_driver_name);
 427         if (err)
 428                 goto err_request_regions;
 429
 430         pci_set_master(pdev);
 431
 432         netdev = alloc_etherdev(sizeof(struct ixgb_adapter));
 433         if (!netdev) {
 434                 err = -ENOMEM;
 435                 goto err_alloc_etherdev;
 436         }
 437
 438         SET_NETDEV_DEV(netdev, &pdev->dev);
 439
 440         pci_set_drvdata(pdev, netdev);
 441         adapter = netdev_priv(netdev);
 442         adapter->netdev = netdev;
 443         adapter->pdev = pdev;
 444         adapter->hw.back = adapter;
 445         adapter->msg_enable = netif_msg_init(debug, DEFAULT_MSG_ENABLE);
 446
 447         adapter->hw.hw_addr = pci_ioremap_bar(pdev, BAR_0);
 448         if (!adapter->hw.hw_addr) {
 449                 err = -EIO;
 450                 goto err_ioremap;
 451         }
 452
 453         for (i = BAR_1; i <= BAR_5; i++) {
 454                 if (pci_resource_len(pdev, i) == 0)
 455                         continue;
 456                 if (pci_resource_flags(pdev, i) & IORESOURCE_IO) {
 457                         adapter->hw.io_base = pci_resource_start(pdev, i);
 458                         break;
 459                 }
 460         }
 461
 462         netdev->netdev_ops = &ixgb_netdev_ops;
 463         ixgb_set_ethtool_ops(netdev);
 464         netdev->watchdog_timeo = 5 * HZ;
 465         netif_napi_add(netdev, &adapter->napi, ixgb_clean, 64);
 466
 467         strncpy(netdev->name, pci_name(pdev), sizeof(netdev->name) - 1);
 468
 469         adapter->bd_number = cards_found;
 470         adapter->link_speed = 0;
 471         adapter->link_duplex = 0;
 472
 473         /* setup the private structure */
 474
 475         err = ixgb_sw_init(adapter);
 476         if (err)
 477                 goto err_sw_init;
 478
 479         netdev->hw_features = NETIF_F_SG |
 480                            NETIF_F_TSO |
 481                            NETIF_F_HW_CSUM |
 482                            NETIF_F_HW_VLAN_TX |
 483                            NETIF_F_HW_VLAN_RX;
 484         netdev->features = netdev->hw_features |
 485                            NETIF_F_HW_VLAN_FILTER;
 486         netdev->hw_features |= NETIF_F_RXCSUM;
 487
 488         if (pci_using_dac) {
 489                 netdev->features |= NETIF_F_HIGHDMA;
 490                 netdev->vlan_features |= NETIF_F_HIGHDMA;
 491         }
 492
 493         /* make sure the EEPROM is good */
 494
 495         if (!ixgb_validate_eeprom_checksum(&adapter->hw)) {
 496                 netif_err(adapter, probe, adapter->netdev,
 497                           "The EEPROM Checksum Is Not Valid\n");
 498                 err = -EIO;
 499                 goto err_eeprom;
 500         }
 501
 502         ixgb_get_ee_mac_addr(&adapter->hw, netdev->dev_addr);
 503
 504         if (!is_valid_ether_addr(netdev->dev_addr)) {
 505                 netif_err(adapter, probe, adapter->netdev, "Invalid MAC Address\n");
 506                 err = -EIO;
 507                 goto err_eeprom;
 508         }
 509
 510         adapter->part_num = ixgb_get_ee_pba_number(&adapter->hw);
 511
 512         init_timer(&adapter->watchdog_timer);
 513         adapter->watchdog_timer.function = ixgb_watchdog;
 514         adapter->watchdog_timer.data = (unsigned long)adapter;
 515
 516         INIT_WORK(&adapter->tx_timeout_task, ixgb_tx_timeout_task);
 517
 518         strcpy(netdev->name, "eth%d");
 519         err = register_netdev(netdev);
 520         if (err)
 521                 goto err_register;
 522
 523         /* carrier off reporting is important to ethtool even BEFORE open */
 524         netif_carrier_off(netdev);
 525
 526         netif_info(adapter, probe, adapter->netdev,
 527                    "Intel(R) PRO/10GbE Network Connection\n");
 528         ixgb_check_options(adapter);
 529         /* reset the hardware with the new settings */
 530
 531         ixgb_reset(adapter);
 532
 533         cards_found++;
 534         return 0;
 535
 536 err_register:
 537 err_sw_init:
 538 err_eeprom:
 539         iounmap(adapter->hw.hw_addr);
 540 err_ioremap:
 541         free_netdev(netdev);
 542 err_alloc_etherdev:
 543         pci_release_regions(pdev);
 544 err_request_regions:
 545 err_dma_mask:
 546         pci_disable_device(pdev);
 547         return err;
 548 }
 549
 550 /**
 551  * ixgb_remove - Device Removal Routine
 552  * @pdev: PCI device information struct
 553  *
 554  * ixgb_remove is called by the PCI subsystem to alert the driver
 555  * that it should release a PCI device.  The could be caused by a
 556  * Hot-Plug event, or because the driver is going to be removed from
 557  * memory.
 558  **/
 559
 560 static void
 561 ixgb_remove(struct pci_dev *pdev)
 562 {
 563         struct net_device *netdev = pci_get_drvdata(pdev);
 564         struct ixgb_adapter *adapter = netdev_priv(netdev);
 565
 566         cancel_work_sync(&adapter->tx_timeout_task);
 567
 568         unregister_netdev(netdev);
 569
 570         iounmap(adapter->hw.hw_addr);
 571         pci_release_regions(pdev);
 572
 573         free_netdev(netdev);
 574         pci_disable_device(pdev);
 575 }
 576
 577 /**
 578  * ixgb_sw_init - Initialize general software structures (struct ixgb_adapter)
 579  * @adapter: board private structure to initialize
 580  *
 581  * ixgb_sw_init initializes the Adapter private data structure.
 582  * Fields are initialized based on PCI device information and
 583  * OS network device settings (MTU size).
 584  **/
 585
 586 static int
 587 ixgb_sw_init(struct ixgb_adapter *adapter)
 588 {
 589         struct ixgb_hw *hw = &adapter->hw;
 590         struct net_device *netdev = adapter->netdev;
 591         struct pci_dev *pdev = adapter->pdev;
 592
 593         /* PCI config space info */
 594
 595         hw->vendor_id = pdev->vendor;
 596         hw->device_id = pdev->device;
 597         hw->subsystem_vendor_id = pdev->subsystem_vendor;
 598         hw->subsystem_id = pdev->subsystem_device;
 599
 600         hw->max_frame_size = netdev->mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;
 601         adapter->rx_buffer_len = hw->max_frame_size + 8; /* + 8 for errata */
 602
 603         if ((hw->device_id == IXGB_DEVICE_ID_82597EX) ||
 604             (hw->device_id == IXGB_DEVICE_ID_82597EX_CX4) ||
 605             (hw->device_id == IXGB_DEVICE_ID_82597EX_LR) ||
 606             (hw->device_id == IXGB_DEVICE_ID_82597EX_SR))
 607                 hw->mac_type = ixgb_82597;
 608         else {
 609                 /* should never have loaded on this device */
 610                 netif_err(adapter, probe, adapter->netdev, "unsupported device id\n");
 611         }
 612
 613         /* enable flow control to be programmed */
 614         hw->fc.send_xon = 1;
 615
 616         set_bit(__IXGB_DOWN, &adapter->flags);
 617         return 0;
 618 }
 619
 620 /**
 621  * ixgb_open - Called when a network interface is made active
 622  * @netdev: network interface device structure
 623  *
 624  * Returns 0 on success, negative value on failure
 625  *
 626  * The open entry point is called when a network interface is made
 627  * active by the system (IFF_UP).  At this point all resources needed
 628  * for transmit and receive operations are allocated, the interrupt
 629  * handler is registered with the OS, the watchdog timer is started,
 630  * and the stack is notified that the interface is ready.
 631  **/
 632
 633 static int
 634 ixgb_open(struct net_device *netdev)
 635 {
 636         struct ixgb_adapter *adapter = netdev_priv(netdev);
 637         int err;
 638
 639         /* allocate transmit descriptors */
 640         err = ixgb_setup_tx_resources(adapter);
 641         if (err)
 642                 goto err_setup_tx;
 643
 644         netif_carrier_off(netdev);
 645
 646         /* allocate receive descriptors */
 647
 648         err = ixgb_setup_rx_resources(adapter);
 649         if (err)
 650                 goto err_setup_rx;
 651
 652         err = ixgb_up(adapter);
 653         if (err)
 654                 goto err_up;
 655
 656         netif_start_queue(netdev);
 657
 658         return 0;
 659
 660 err_up:
 661         ixgb_free_rx_resources(adapter);
 662 err_setup_rx:
 663         ixgb_free_tx_resources(adapter);
 664 err_setup_tx:
 665         ixgb_reset(adapter);
 666
 667         return err;
 668 }
 669
 670 /**
 671  * ixgb_close - Disables a network interface
 672  * @netdev: network interface device structure
 673  *
 674  * Returns 0, this is not allowed to fail
 675  *
 676  * The close entry point is called when an interface is de-activated
 677  * by the OS.  The hardware is still under the drivers control, but
 678  * needs to be disabled.  A global MAC reset is issued to stop the
 679  * hardware, and all transmit and receive resources are freed.
 680  **/
 681
 682 static int
 683 ixgb_close(struct net_device *netdev)
 684 {
 685         struct ixgb_adapter *adapter = netdev_priv(netdev);
 686
 687         ixgb_down(adapter, true);
 688
 689         ixgb_free_tx_resources(adapter);
 690         ixgb_free_rx_resources(adapter);
 691
 692         return 0;
 693 }
 694
 695 /**
 696  * ixgb_setup_tx_resources - allocate Tx resources (Descriptors)
 697  * @adapter: board private structure
 698  *
 699  * Return 0 on success, negative on failure
 700  **/
 701
 702 int
 703 ixgb_setup_tx_resources(struct ixgb_adapter *adapter)
 704 {
 705         struct ixgb_desc_ring *txdr = &adapter->tx_ring;
 706         struct pci_dev *pdev = adapter->pdev;
 707         int size;
 708
 709         size = sizeof(struct ixgb_buffer) * txdr->count;
 710         txdr->buffer_info = vzalloc(size);
 711         if (!txdr->buffer_info)
 712                 return -ENOMEM;
 713
 714         /* round up to nearest 4K */
 715
 716         txdr->size = txdr->count * sizeof(struct ixgb_tx_desc);
 717         txdr->size = ALIGN(txdr->size, 4096);
 718
 719         txdr->desc = dma_alloc_coherent(&pdev->dev, txdr->size, &txdr->dma,
 720                                         GFP_KERNEL | __GFP_ZERO);
 721         if (!txdr->desc) {
 722                 vfree(txdr->buffer_info);
 723                 return -ENOMEM;
 724         }
 725
 726         txdr->next_to_use = 0;
 727         txdr->next_to_clean = 0;
 728
 729         return 0;
 730 }
 731
 732 /**
 733  * ixgb_configure_tx - Configure 82597 Transmit Unit after Reset.
 734  * @adapter: board private structure
 735  *
 736  * Configure the Tx unit of the MAC after a reset.
 737  **/
 738
 739 static void
 740 ixgb_configure_tx(struct ixgb_adapter *adapter)
 741 {
 742         u64 tdba = adapter->tx_ring.dma;
 743         u32 tdlen = adapter->tx_ring.count * sizeof(struct ixgb_tx_desc);
 744         u32 tctl;
 745         struct ixgb_hw *hw = &adapter->hw;
 746
 747         /* Setup the Base and Length of the Tx Descriptor Ring
 748          * tx_ring.dma can be either a 32 or 64 bit value
 749          */
 750
 751         IXGB_WRITE_REG(hw, TDBAL, (tdba & 0x00000000ffffffffULL));
 752         IXGB_WRITE_REG(hw, TDBAH, (tdba >> 32));
 753
 754         IXGB_WRITE_REG(hw, TDLEN, tdlen);
 755
 756         /* Setup the HW Tx Head and Tail descriptor pointers */
 757
 758         IXGB_WRITE_REG(hw, TDH, 0);
 759         IXGB_WRITE_REG(hw, TDT, 0);
 760
 761         /* don't set up txdctl, it induces performance problems if configured
 762          * incorrectly */
 763         /* Set the Tx Interrupt Delay register */
 764
 765         IXGB_WRITE_REG(hw, TIDV, adapter->tx_int_delay);
 766
 767         /* Program the Transmit Control Register */
 768
 769         tctl = IXGB_TCTL_TCE | IXGB_TCTL_TXEN | IXGB_TCTL_TPDE;
 770         IXGB_WRITE_REG(hw, TCTL, tctl);
 771
 772         /* Setup Transmit Descriptor Settings for this adapter */
 773         adapter->tx_cmd_type =
 774                 IXGB_TX_DESC_TYPE |
 775                 (adapter->tx_int_delay_enable ? IXGB_TX_DESC_CMD_IDE : 0);
 776 }
 777
 778 /**
 779  * ixgb_setup_rx_resources - allocate Rx resources (Descriptors)
 780  * @adapter: board private structure
 781  *
 782  * Returns 0 on success, negative on failure
 783  **/
 784
 785 int
 786 ixgb_setup_rx_resources(struct ixgb_adapter *adapter)
 787 {
 788         struct ixgb_desc_ring *rxdr = &adapter->rx_ring;
 789         struct pci_dev *pdev = adapter->pdev;
 790         int size;
 791
 792         size = sizeof(struct ixgb_buffer) * rxdr->count;
 793         rxdr->buffer_info = vzalloc(size);
 794         if (!rxdr->buffer_info)
 795                 return -ENOMEM;
 796
 797         /* Round up to nearest 4K */
 798
 799         rxdr->size = rxdr->count * sizeof(struct ixgb_rx_desc);
 800         rxdr->size = ALIGN(rxdr->size, 4096);
 801
 802         rxdr->desc = dma_alloc_coherent(&pdev->dev, rxdr->size, &rxdr->dma,
 803                                         GFP_KERNEL);
 804
 805         if (!rxdr->desc) {
 806                 vfree(rxdr->buffer_info);
 807                 return -ENOMEM;
 808         }
 809         memset(rxdr->desc, 0, rxdr->size);
 810
 811         rxdr->next_to_clean = 0;
 812         rxdr->next_to_use = 0;
 813
 814         return 0;
 815 }
 816
 817 /**
 818  * ixgb_setup_rctl - configure the receive control register
 819  * @adapter: Board private structure
 820  **/
 821
 822 static void
 823 ixgb_setup_rctl(struct ixgb_adapter *adapter)
 824 {
 825         u32 rctl;
 826
 827         rctl = IXGB_READ_REG(&adapter->hw, RCTL);
 828
 829         rctl &= ~(3 << IXGB_RCTL_MO_SHIFT);
 830
 831         rctl |=
 832                 IXGB_RCTL_BAM | IXGB_RCTL_RDMTS_1_2 |
 833                 IXGB_RCTL_RXEN | IXGB_RCTL_CFF |
 834                 (adapter->hw.mc_filter_type << IXGB_RCTL_MO_SHIFT);
 835
 836         rctl |= IXGB_RCTL_SECRC;
 837
 838         if (adapter->rx_buffer_len <= IXGB_RXBUFFER_2048)
 839                 rctl |= IXGB_RCTL_BSIZE_2048;
 840         else if (adapter->rx_buffer_len <= IXGB_RXBUFFER_4096)
 841                 rctl |= IXGB_RCTL_BSIZE_4096;
 842         else if (adapter->rx_buffer_len <= IXGB_RXBUFFER_8192)
 843                 rctl |= IXGB_RCTL_BSIZE_8192;
 844         else if (adapter->rx_buffer_len <= IXGB_RXBUFFER_16384)
 845                 rctl |= IXGB_RCTL_BSIZE_16384;
 846
 847         IXGB_WRITE_REG(&adapter->hw, RCTL, rctl);
 848 }
 849
 850 /**
 851  * ixgb_configure_rx - Configure 82597 Receive Unit after Reset.
 852  * @adapter: board private structure
 853  *
 854  * Configure the Rx unit of the MAC after a reset.
 855  **/
 856
 857 static void
 858 ixgb_configure_rx(struct ixgb_adapter *adapter)
 859 {
 860         u64 rdba = adapter->rx_ring.dma;
 861         u32 rdlen = adapter->rx_ring.count * sizeof(struct ixgb_rx_desc);
 862         struct ixgb_hw *hw = &adapter->hw;
 863         u32 rctl;
 864         u32 rxcsum;
 865
 866         /* make sure receives are disabled while setting up the descriptors */
 867
 868         rctl = IXGB_READ_REG(hw, RCTL);
 869         IXGB_WRITE_REG(hw, RCTL, rctl & ~IXGB_RCTL_RXEN);
 870
 871         /* set the Receive Delay Timer Register */
 872
 873         IXGB_WRITE_REG(hw, RDTR, adapter->rx_int_delay);
 874
 875         /* Setup the Base and Length of the Rx Descriptor Ring */
 876
 877         IXGB_WRITE_REG(hw, RDBAL, (rdba & 0x00000000ffffffffULL));
 878         IXGB_WRITE_REG(hw, RDBAH, (rdba >> 32));
 879
 880         IXGB_WRITE_REG(hw, RDLEN, rdlen);
 881
 882         /* Setup the HW Rx Head and Tail Descriptor Pointers */
 883         IXGB_WRITE_REG(hw, RDH, 0);
 884         IXGB_WRITE_REG(hw, RDT, 0);
 885
 886         /* due to the hardware errata with RXDCTL, we are unable to use any of
 887          * the performance enhancing features of it without causing other
 888          * subtle bugs, some of the bugs could include receive length
 889          * corruption at high data rates (WTHRESH > 0) and/or receive
 890          * descriptor ring irregularites (particularly in hardware cache) */
 891         IXGB_WRITE_REG(hw, RXDCTL, 0);
 892
 893         /* Enable Receive Checksum Offload for TCP and UDP */
 894         if (adapter->rx_csum) {
 895                 rxcsum = IXGB_READ_REG(hw, RXCSUM);
 896                 rxcsum |= IXGB_RXCSUM_TUOFL;
 897                 IXGB_WRITE_REG(hw, RXCSUM, rxcsum);
 898         }
 899
 900         /* Enable Receives */
 901
 902         IXGB_WRITE_REG(hw, RCTL, rctl);
 903 }
 904
 905 /**
 906  * ixgb_free_tx_resources - Free Tx Resources
 907  * @adapter: board private structure
 908  *
 909  * Free all transmit software resources
 910  **/
 911
 912 void
 913 ixgb_free_tx_resources(struct ixgb_adapter *adapter)
 914 {
 915         struct pci_dev *pdev = adapter->pdev;
 916
 917         ixgb_clean_tx_ring(adapter);
 918
 919         vfree(adapter->tx_ring.buffer_info);
 920         adapter->tx_ring.buffer_info = NULL;
 921
 922         dma_free_coherent(&pdev->dev, adapter->tx_ring.size,
 923                           adapter->tx_ring.desc, adapter->tx_ring.dma);
 924
 925         adapter->tx_ring.desc = NULL;
 926 }
 927
 928 static void
 929 ixgb_unmap_and_free_tx_resource(struct ixgb_adapter *adapter,
 930                                 struct ixgb_buffer *buffer_info)
 931 {
 932         if (buffer_info->dma) {
 933                 if (buffer_info->mapped_as_page)
 934                         dma_unmap_page(&adapter->pdev->dev, buffer_info->dma,
 935                                        buffer_info->length, DMA_TO_DEVICE);
 936                 else
 937                         dma_unmap_single(&adapter->pdev->dev, buffer_info->dma,
 938                                          buffer_info->length, DMA_TO_DEVICE);
 939                 buffer_info->dma = 0;
 940         }
 941
 942         if (buffer_info->skb) {
 943                 dev_kfree_skb_any(buffer_info->skb);
 944                 buffer_info->skb = NULL;
 945         }
 946         buffer_info->time_stamp = 0;
 947         /* these fields must always be initialized in tx
 948          * buffer_info->length = 0;
 949          * buffer_info->next_to_watch = 0; */
 950 }
 951
 952 /**
 953  * ixgb_clean_tx_ring - Free Tx Buffers
 954  * @adapter: board private structure
 955  **/
 956
 957 static void
 958 ixgb_clean_tx_ring(struct ixgb_adapter *adapter)
 959 {
 960         struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
 961         struct ixgb_buffer *buffer_info;
 962         unsigned long size;
 963         unsigned int i;
 964
 965         /* Free all the Tx ring sk_buffs */
 966
 967         for (i = 0; i < tx_ring->count; i++) {
 968                 buffer_info = &tx_ring->buffer_info[i];
 969                 ixgb_unmap_and_free_tx_resource(adapter, buffer_info);
 970         }
 971
 972         size = sizeof(struct ixgb_buffer) * tx_ring->count;
 973         memset(tx_ring->buffer_info, 0, size);
 974
 975         /* Zero out the descriptor ring */
 976
 977         memset(tx_ring->desc, 0, tx_ring->size);
 978
 979         tx_ring->next_to_use = 0;
 980         tx_ring->next_to_clean = 0;
 981
 982         IXGB_WRITE_REG(&adapter->hw, TDH, 0);
 983         IXGB_WRITE_REG(&adapter->hw, TDT, 0);
 984 }
 985
 986 /**
 987  * ixgb_free_rx_resources - Free Rx Resources
 988  * @adapter: board private structure
 989  *
 990  * Free all receive software resources
 991  **/
 992
 993 void
 994 ixgb_free_rx_resources(struct ixgb_adapter *adapter)
 995 {
 996         struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
 997         struct pci_dev *pdev = adapter->pdev;
 998
 999         ixgb_clean_rx_ring(adapter);
1000
1001         vfree(rx_ring->buffer_info);
1002         rx_ring->buffer_info = NULL;
1003
1004         dma_free_coherent(&pdev->dev, rx_ring->size, rx_ring->desc,
1005                           rx_ring->dma);
1006
1007         rx_ring->desc = NULL;
1008 }
1009
1010 /**
1011  * ixgb_clean_rx_ring - Free Rx Buffers
1012  * @adapter: board private structure
1013  **/
1014
1015 static void
1016 ixgb_clean_rx_ring(struct ixgb_adapter *adapter)
1017 {
1018         struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
1019         struct ixgb_buffer *buffer_info;
1020         struct pci_dev *pdev = adapter->pdev;
1021         unsigned long size;
1022         unsigned int i;
1023
1024         /* Free all the Rx ring sk_buffs */
1025
1026         for (i = 0; i < rx_ring->count; i++) {
1027                 buffer_info = &rx_ring->buffer_info[i];
1028                 if (buffer_info->dma) {
1029                         dma_unmap_single(&pdev->dev,
1030                                          buffer_info->dma,
1031                                          buffer_info->length,
1032                                          DMA_FROM_DEVICE);
1033                         buffer_info->dma = 0;
1034                         buffer_info->length = 0;
1035                 }
1036
1037                 if (buffer_info->skb) {
1038                         dev_kfree_skb(buffer_info->skb);
1039                         buffer_info->skb = NULL;
1040                 }
1041         }
1042
1043         size = sizeof(struct ixgb_buffer) * rx_ring->count;
1044         memset(rx_ring->buffer_info, 0, size);
1045
1046         /* Zero out the descriptor ring */
1047
1048         memset(rx_ring->desc, 0, rx_ring->size);
1049
1050         rx_ring->next_to_clean = 0;
1051         rx_ring->next_to_use = 0;
1052
1053         IXGB_WRITE_REG(&adapter->hw, RDH, 0);
1054         IXGB_WRITE_REG(&adapter->hw, RDT, 0);
1055 }
1056
1057 /**
1058  * ixgb_set_mac - Change the Ethernet Address of the NIC
1059  * @netdev: network interface device structure
1060  * @p: pointer to an address structure
1061  *
1062  * Returns 0 on success, negative on failure
1063  **/
1064
1065 static int
1066 ixgb_set_mac(struct net_device *netdev, void *p)
1067 {
1068         struct ixgb_adapter *adapter = netdev_priv(netdev);
1069         struct sockaddr *addr = p;
1070
1071         if (!is_valid_ether_addr(addr->sa_data))
1072                 return -EADDRNOTAVAIL;
1073
1074         memcpy(netdev->dev_addr, addr->sa_data, netdev->addr_len);
1075
1076         ixgb_rar_set(&adapter->hw, addr->sa_data, 0);
1077
1078         return 0;
1079 }
1080
1081 /**
1082  * ixgb_set_multi - Multicast and Promiscuous mode set
1083  * @netdev: network interface device structure
1084  *
1085  * The set_multi entry point is called whenever the multicast address
1086  * list or the network interface flags are updated.  This routine is
1087  * responsible for configuring the hardware for proper multicast,
1088  * promiscuous mode, and all-multi behavior.
1089  **/
1090
1091 static void
1092 ixgb_set_multi(struct net_device *netdev)
1093 {
1094         struct ixgb_adapter *adapter = netdev_priv(netdev);
1095         struct ixgb_hw *hw = &adapter->hw;
1096         struct netdev_hw_addr *ha;
1097         u32 rctl;
1098
1099         /* Check for Promiscuous and All Multicast modes */
1100
1101         rctl = IXGB_READ_REG(hw, RCTL);
1102
1103         if (netdev->flags & IFF_PROMISC) {
1104                 rctl |= (IXGB_RCTL_UPE | IXGB_RCTL_MPE);
1105                 /* disable VLAN filtering */
1106                 rctl &= ~IXGB_RCTL_CFIEN;
1107                 rctl &= ~IXGB_RCTL_VFE;
1108         } else {
1109                 if (netdev->flags & IFF_ALLMULTI) {
1110                         rctl |= IXGB_RCTL_MPE;
1111                         rctl &= ~IXGB_RCTL_UPE;
1112                 } else {
1113                         rctl &= ~(IXGB_RCTL_UPE | IXGB_RCTL_MPE);
1114                 }
1115                 /* enable VLAN filtering */
1116                 rctl |= IXGB_RCTL_VFE;
1117                 rctl &= ~IXGB_RCTL_CFIEN;
1118         }
1119
1120         if (netdev_mc_count(netdev) > IXGB_MAX_NUM_MULTICAST_ADDRESSES) {
1121                 rctl |= IXGB_RCTL_MPE;
1122                 IXGB_WRITE_REG(hw, RCTL, rctl);
1123         } else {
1124                 u8 *mta = kmalloc(IXGB_MAX_NUM_MULTICAST_ADDRESSES *
1125                               ETH_ALEN, GFP_ATOMIC);
1126                 u8 *addr;
1127                 if (!mta)
1128                         goto alloc_failed;
1129
1130                 IXGB_WRITE_REG(hw, RCTL, rctl);
1131
1132                 addr = mta;
1133                 netdev_for_each_mc_addr(ha, netdev) {
1134                         memcpy(addr, ha->addr, ETH_ALEN);
1135                         addr += ETH_ALEN;
1136                 }
1137
1138                 ixgb_mc_addr_list_update(hw, mta, netdev_mc_count(netdev), 0);
1139                 kfree(mta);
1140         }
1141
1142 alloc_failed:
1143         if (netdev->features & NETIF_F_HW_VLAN_RX)
1144                 ixgb_vlan_strip_enable(adapter);
1145         else
1146                 ixgb_vlan_strip_disable(adapter);
1147
1148 }
1149
1150 /**
1151  * ixgb_watchdog - Timer Call-back
1152  * @data: pointer to netdev cast into an unsigned long
1153  **/
1154
1155 static void
1156 ixgb_watchdog(unsigned long data)
1157 {
1158         struct ixgb_adapter *adapter = (struct ixgb_adapter *)data;
1159         struct net_device *netdev = adapter->netdev;
1160         struct ixgb_desc_ring *txdr = &adapter->tx_ring;
1161
1162         ixgb_check_for_link(&adapter->hw);
1163
1164         if (ixgb_check_for_bad_link(&adapter->hw)) {
1165                 /* force the reset path */
1166                 netif_stop_queue(netdev);
1167         }
1168
1169         if (adapter->hw.link_up) {
1170                 if (!netif_carrier_ok(netdev)) {
1171                         netdev_info(netdev,
1172                                     "NIC Link is Up 10 Gbps Full Duplex, Flow Control: %s\n",
1173                                     (adapter->hw.fc.type == ixgb_fc_full) ?
1174                                     "RX/TX" :
1175                                     (adapter->hw.fc.type == ixgb_fc_rx_pause) ?
1176                                      "RX" :
1177                                     (adapter->hw.fc.type == ixgb_fc_tx_pause) ?
1178                                     "TX" : "None");
1179                         adapter->link_speed = 10000;
1180                         adapter->link_duplex = FULL_DUPLEX;
1181                         netif_carrier_on(netdev);
1182                 }
1183         } else {
1184                 if (netif_carrier_ok(netdev)) {
1185                         adapter->link_speed = 0;
1186                         adapter->link_duplex = 0;
1187                         netdev_info(netdev, "NIC Link is Down\n");
1188                         netif_carrier_off(netdev);
1189                 }
1190         }
1191
1192         ixgb_update_stats(adapter);
1193
1194         if (!netif_carrier_ok(netdev)) {
1195                 if (IXGB_DESC_UNUSED(txdr) + 1 < txdr->count) {
1196                         /* We've lost link, so the controller stops DMA,
1197                          * but we've got queued Tx work that's never going
1198                          * to get done, so reset controller to flush Tx.
1199                          * (Do the reset outside of interrupt context). */
1200                         schedule_work(&adapter->tx_timeout_task);
1201                         /* return immediately since reset is imminent */
1202                         return;
1203                 }
1204         }
1205
1206         /* Force detection of hung controller every watchdog period */
1207         adapter->detect_tx_hung = true;
1208
1209         /* generate an interrupt to force clean up of any stragglers */
1210         IXGB_WRITE_REG(&adapter->hw, ICS, IXGB_INT_TXDW);
1211
1212         /* Reset the timer */
1213         mod_timer(&adapter->watchdog_timer, jiffies + 2 * HZ);
1214 }
1215
1216 #define IXGB_TX_FLAGS_CSUM              0x00000001
1217 #define IXGB_TX_FLAGS_VLAN              0x00000002
1218 #define IXGB_TX_FLAGS_TSO               0x00000004
1219
1220 static int
1221 ixgb_tso(struct ixgb_adapter *adapter, struct sk_buff *skb)
1222 {
1223         struct ixgb_context_desc *context_desc;
1224         unsigned int i;
1225         u8 ipcss, ipcso, tucss, tucso, hdr_len;
1226         u16 ipcse, tucse, mss;
1227         int err;
1228
1229         if (likely(skb_is_gso(skb))) {
1230                 struct ixgb_buffer *buffer_info;
1231                 struct iphdr *iph;
1232
1233                 if (skb_header_cloned(skb)) {
1234                         err = pskb_expand_head(skb, 0, 0, GFP_ATOMIC);
1235                         if (err)
1236                                 return err;
1237                 }
1238
1239                 hdr_len = skb_transport_offset(skb) + tcp_hdrlen(skb);
1240                 mss = skb_shinfo(skb)->gso_size;
1241                 iph = ip_hdr(skb);
1242                 iph->tot_len = 0;
1243                 iph->check = 0;
1244                 tcp_hdr(skb)->check = ~csum_tcpudp_magic(iph->saddr,
1245                                                          iph->daddr, 0,
1246                                                          IPPROTO_TCP, 0);
1247                 ipcss = skb_network_offset(skb);
1248                 ipcso = (void *)&(iph->check) - (void *)skb->data;
1249                 ipcse = skb_transport_offset(skb) - 1;
1250                 tucss = skb_transport_offset(skb);
1251                 tucso = (void *)&(tcp_hdr(skb)->check) - (void *)skb->data;
1252                 tucse = 0;
1253
1254                 i = adapter->tx_ring.next_to_use;
1255                 context_desc = IXGB_CONTEXT_DESC(adapter->tx_ring, i);
1256                 buffer_info = &adapter->tx_ring.buffer_info[i];
1257                 WARN_ON(buffer_info->dma != 0);
1258
1259                 context_desc->ipcss = ipcss;
1260                 context_desc->ipcso = ipcso;
1261                 context_desc->ipcse = cpu_to_le16(ipcse);
1262                 context_desc->tucss = tucss;
1263                 context_desc->tucso = tucso;
1264                 context_desc->tucse = cpu_to_le16(tucse);
1265                 context_desc->mss = cpu_to_le16(mss);
1266                 context_desc->hdr_len = hdr_len;
1267                 context_desc->status = 0;
1268                 context_desc->cmd_type_len = cpu_to_le32(
1269                                                   IXGB_CONTEXT_DESC_TYPE
1270                                                 | IXGB_CONTEXT_DESC_CMD_TSE
1271                                                 | IXGB_CONTEXT_DESC_CMD_IP
1272                                                 | IXGB_CONTEXT_DESC_CMD_TCP
1273                                                 | IXGB_CONTEXT_DESC_CMD_IDE
1274                                                 | (skb->len - (hdr_len)));
1275
1276
1277                 if (++i == adapter->tx_ring.count) i = 0;
1278                 adapter->tx_ring.next_to_use = i;
1279
1280                 return 1;
1281         }
1282
1283         return 0;
1284 }
1285
1286 static bool
1287 ixgb_tx_csum(struct ixgb_adapter *adapter, struct sk_buff *skb)
1288 {
1289         struct ixgb_context_desc *context_desc;
1290         unsigned int i;
1291         u8 css, cso;
1292
1293         if (likely(skb->ip_summed == CHECKSUM_PARTIAL)) {
1294                 struct ixgb_buffer *buffer_info;
1295                 css = skb_checksum_start_offset(skb);
1296                 cso = css + skb->csum_offset;
1297
1298                 i = adapter->tx_ring.next_to_use;
1299                 context_desc = IXGB_CONTEXT_DESC(adapter->tx_ring, i);
1300                 buffer_info = &adapter->tx_ring.buffer_info[i];
1301                 WARN_ON(buffer_info->dma != 0);
1302
1303                 context_desc->tucss = css;
1304                 context_desc->tucso = cso;
1305                 context_desc->tucse = 0;
1306                 /* zero out any previously existing data in one instruction */
1307                 *(u32 *)&(context_desc->ipcss) = 0;
1308                 context_desc->status = 0;
1309                 context_desc->hdr_len = 0;
1310                 context_desc->mss = 0;
1311                 context_desc->cmd_type_len =
1312                         cpu_to_le32(IXGB_CONTEXT_DESC_TYPE
1313                                     | IXGB_TX_DESC_CMD_IDE);
1314
1315                 if (++i == adapter->tx_ring.count) i = 0;
1316                 adapter->tx_ring.next_to_use = i;
1317
1318                 return true;
1319         }
1320
1321         return false;
1322 }
1323
1324 #define IXGB_MAX_TXD_PWR        14
1325 #define IXGB_MAX_DATA_PER_TXD   (1<<IXGB_MAX_TXD_PWR)
1326
1327 static int
1328 ixgb_tx_map(struct ixgb_adapter *adapter, struct sk_buff *skb,
1329             unsigned int first)
1330 {
1331         struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
1332         struct pci_dev *pdev = adapter->pdev;
1333         struct ixgb_buffer *buffer_info;
1334         int len = skb_headlen(skb);
1335         unsigned int offset = 0, size, count = 0, i;
1336         unsigned int mss = skb_shinfo(skb)->gso_size;
1337         unsigned int nr_frags = skb_shinfo(skb)->nr_frags;
1338         unsigned int f;
1339
1340         i = tx_ring->next_to_use;
1341
1342         while (len) {
1343                 buffer_info = &tx_ring->buffer_info[i];
1344                 size = min(len, IXGB_MAX_DATA_PER_TXD);
1345                 /* Workaround for premature desc write-backs
1346                  * in TSO mode.  Append 4-byte sentinel desc */
1347                 if (unlikely(mss && !nr_frags && size == len && size > 8))
1348                         size -= 4;
1349
1350                 buffer_info->length = size;
1351                 WARN_ON(buffer_info->dma != 0);
1352                 buffer_info->time_stamp = jiffies;
1353                 buffer_info->mapped_as_page = false;
1354                 buffer_info->dma = dma_map_single(&pdev->dev,
1355                                                   skb->data + offset,
1356                                                   size, DMA_TO_DEVICE);
1357                 if (dma_mapping_error(&pdev->dev, buffer_info->dma))
1358                         goto dma_error;
1359                 buffer_info->next_to_watch = 0;
1360
1361                 len -= size;
1362                 offset += size;
1363                 count++;
1364                 if (len) {
1365                         i++;
1366                         if (i == tx_ring->count)
1367                                 i = 0;
1368                 }
1369         }
1370
1371         for (f = 0; f < nr_frags; f++) {
1372                 const struct skb_frag_struct *frag;
1373
1374                 frag = &skb_shinfo(skb)->frags[f];
1375                 len = skb_frag_size(frag);
1376                 offset = 0;
1377
1378                 while (len) {
1379                         i++;
1380                         if (i == tx_ring->count)
1381                                 i = 0;
1382
1383                         buffer_info = &tx_ring->buffer_info[i];
1384                         size = min(len, IXGB_MAX_DATA_PER_TXD);
1385
1386                         /* Workaround for premature desc write-backs
1387                          * in TSO mode.  Append 4-byte sentinel desc */
1388                         if (unlikely(mss && (f == (nr_frags - 1))
1389                                      && size == len && size > 8))
1390                                 size -= 4;
1391
1392                         buffer_info->length = size;
1393                         buffer_info->time_stamp = jiffies;
1394                         buffer_info->mapped_as_page = true;
1395                         buffer_info->dma =
1396                                 skb_frag_dma_map(&pdev->dev, frag, offset, size,
1397                                                  DMA_TO_DEVICE);
1398                         if (dma_mapping_error(&pdev->dev, buffer_info->dma))
1399                                 goto dma_error;
1400                         buffer_info->next_to_watch = 0;
1401
1402                         len -= size;
1403                         offset += size;
1404                         count++;
1405                 }
1406         }
1407         tx_ring->buffer_info[i].skb = skb;
1408         tx_ring->buffer_info[first].next_to_watch = i;
1409
1410         return count;
1411
1412 dma_error:
1413         dev_err(&pdev->dev, "TX DMA map failed\n");
1414         buffer_info->dma = 0;
1415         if (count)
1416                 count--;
1417
1418         while (count--) {
1419                 if (i==0)
1420                         i += tx_ring->count;
1421                 i--;
1422                 buffer_info = &tx_ring->buffer_info[i];
1423                 ixgb_unmap_and_free_tx_resource(adapter, buffer_info);
1424         }
1425
1426         return 0;
1427 }
1428
1429 static void
1430 ixgb_tx_queue(struct ixgb_adapter *adapter, int count, int vlan_id,int tx_flags)
1431 {
1432         struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
1433         struct ixgb_tx_desc *tx_desc = NULL;
1434         struct ixgb_buffer *buffer_info;
1435         u32 cmd_type_len = adapter->tx_cmd_type;
1436         u8 status = 0;
1437         u8 popts = 0;
1438         unsigned int i;
1439
1440         if (tx_flags & IXGB_TX_FLAGS_TSO) {
1441                 cmd_type_len |= IXGB_TX_DESC_CMD_TSE;
1442                 popts |= (IXGB_TX_DESC_POPTS_IXSM | IXGB_TX_DESC_POPTS_TXSM);
1443         }
1444
1445         if (tx_flags & IXGB_TX_FLAGS_CSUM)
1446                 popts |= IXGB_TX_DESC_POPTS_TXSM;
1447
1448         if (tx_flags & IXGB_TX_FLAGS_VLAN)
1449                 cmd_type_len |= IXGB_TX_DESC_CMD_VLE;
1450
1451         i = tx_ring->next_to_use;
1452
1453         while (count--) {
1454                 buffer_info = &tx_ring->buffer_info[i];
1455                 tx_desc = IXGB_TX_DESC(*tx_ring, i);
1456                 tx_desc->buff_addr = cpu_to_le64(buffer_info->dma);
1457                 tx_desc->cmd_type_len =
1458                         cpu_to_le32(cmd_type_len | buffer_info->length);
1459                 tx_desc->status = status;
1460                 tx_desc->popts = popts;
1461                 tx_desc->vlan = cpu_to_le16(vlan_id);
1462
1463                 if (++i == tx_ring->count) i = 0;
1464         }
1465
1466         tx_desc->cmd_type_len |=
1467                 cpu_to_le32(IXGB_TX_DESC_CMD_EOP | IXGB_TX_DESC_CMD_RS);
1468
1469         /* Force memory writes to complete before letting h/w
1470          * know there are new descriptors to fetch.  (Only
1471          * applicable for weak-ordered memory model archs,
1472          * such as IA-64). */
1473         wmb();
1474
1475         tx_ring->next_to_use = i;
1476         IXGB_WRITE_REG(&adapter->hw, TDT, i);
1477 }
1478
1479 static int __ixgb_maybe_stop_tx(struct net_device *netdev, int size)
1480 {
1481         struct ixgb_adapter *adapter = netdev_priv(netdev);
1482         struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
1483
1484         netif_stop_queue(netdev);
1485         /* Herbert's original patch had:
1486          *  smp_mb__after_netif_stop_queue();
1487          * but since that doesn't exist yet, just open code it. */
1488         smp_mb();
1489
1490         /* We need to check again in a case another CPU has just
1491          * made room available. */
1492         if (likely(IXGB_DESC_UNUSED(tx_ring) < size))
1493                 return -EBUSY;
1494
1495         /* A reprieve! */
1496         netif_start_queue(netdev);
1497         ++adapter->restart_queue;
1498         return 0;
1499 }
1500
1501 static int ixgb_maybe_stop_tx(struct net_device *netdev,
1502                               struct ixgb_desc_ring *tx_ring, int size)
1503 {
1504         if (likely(IXGB_DESC_UNUSED(tx_ring) >= size))
1505                 return 0;
1506         return __ixgb_maybe_stop_tx(netdev, size);
1507 }
1508
1509
1510 /* Tx Descriptors needed, worst case */
1511 #define TXD_USE_COUNT(S) (((S) >> IXGB_MAX_TXD_PWR) + \
1512                          (((S) & (IXGB_MAX_DATA_PER_TXD - 1)) ? 1 : 0))
1513 #define DESC_NEEDED TXD_USE_COUNT(IXGB_MAX_DATA_PER_TXD) /* skb->date */ + \
1514         MAX_SKB_FRAGS * TXD_USE_COUNT(PAGE_SIZE) + 1 /* for context */ \
1515         + 1 /* one more needed for sentinel TSO workaround */
1516
1517 static netdev_tx_t
1518 ixgb_xmit_frame(struct sk_buff *skb, struct net_device *netdev)
1519 {
1520         struct ixgb_adapter *adapter = netdev_priv(netdev);
1521         unsigned int first;
1522         unsigned int tx_flags = 0;
1523         int vlan_id = 0;
1524         int count = 0;
1525         int tso;
1526
1527         if (test_bit(__IXGB_DOWN, &adapter->flags)) {
1528                 dev_kfree_skb(skb);
1529                 return NETDEV_TX_OK;
1530         }
1531
1532         if (skb->len <= 0) {
1533                 dev_kfree_skb(skb);
1534                 return NETDEV_TX_OK;
1535         }
1536
1537         if (unlikely(ixgb_maybe_stop_tx(netdev, &adapter->tx_ring,
1538                      DESC_NEEDED)))
1539                 return NETDEV_TX_BUSY;
1540
1541         if (vlan_tx_tag_present(skb)) {
1542                 tx_flags |= IXGB_TX_FLAGS_VLAN;
1543                 vlan_id = vlan_tx_tag_get(skb);
1544         }
1545
1546         first = adapter->tx_ring.next_to_use;
1547
1548         tso = ixgb_tso(adapter, skb);
1549         if (tso < 0) {
1550                 dev_kfree_skb(skb);
1551                 return NETDEV_TX_OK;
1552         }
1553
1554         if (likely(tso))
1555                 tx_flags |= IXGB_TX_FLAGS_TSO;
1556         else if (ixgb_tx_csum(adapter, skb))
1557                 tx_flags |= IXGB_TX_FLAGS_CSUM;
1558
1559         count = ixgb_tx_map(adapter, skb, first);
1560
1561         if (count) {
1562                 ixgb_tx_queue(adapter, count, vlan_id, tx_flags);
1563                 /* Make sure there is space in the ring for the next send. */
1564                 ixgb_maybe_stop_tx(netdev, &adapter->tx_ring, DESC_NEEDED);
1565
1566         } else {
1567                 dev_kfree_skb_any(skb);
1568                 adapter->tx_ring.buffer_info[first].time_stamp = 0;
1569                 adapter->tx_ring.next_to_use = first;
1570         }
1571
1572         return NETDEV_TX_OK;
1573 }
1574
1575 /**
1576  * ixgb_tx_timeout - Respond to a Tx Hang
1577  * @netdev: network interface device structure
1578  **/
1579
1580 static void
1581 ixgb_tx_timeout(struct net_device *netdev)
1582 {
1583         struct ixgb_adapter *adapter = netdev_priv(netdev);
1584
1585         /* Do the reset outside of interrupt context */
1586         schedule_work(&adapter->tx_timeout_task);
1587 }
1588
1589 static void
1590 ixgb_tx_timeout_task(struct work_struct *work)
1591 {
1592         struct ixgb_adapter *adapter =
1593                 container_of(work, struct ixgb_adapter, tx_timeout_task);
1594
1595         adapter->tx_timeout_count++;
1596         ixgb_down(adapter, true);
1597         ixgb_up(adapter);
1598 }
1599
1600 /**
1601  * ixgb_get_stats - Get System Network Statistics
1602  * @netdev: network interface device structure
1603  *
1604  * Returns the address of the device statistics structure.
1605  * The statistics are actually updated from the timer callback.
1606  **/
1607
1608 static struct net_device_stats *
1609 ixgb_get_stats(struct net_device *netdev)
1610 {
1611         return &netdev->stats;
1612 }
1613
1614 /**
1615  * ixgb_change_mtu - Change the Maximum Transfer Unit
1616  * @netdev: network interface device structure
1617  * @new_mtu: new value for maximum frame size
1618  *
1619  * Returns 0 on success, negative on failure
1620  **/
1621
1622 static int
1623 ixgb_change_mtu(struct net_device *netdev, int new_mtu)
1624 {
1625         struct ixgb_adapter *adapter = netdev_priv(netdev);
1626         int max_frame = new_mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;
1627         int old_max_frame = netdev->mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;
1628
1629         /* MTU < 68 is an error for IPv4 traffic, just don't allow it */
1630         if ((new_mtu < 68) ||
1631             (max_frame > IXGB_MAX_JUMBO_FRAME_SIZE + ENET_FCS_LENGTH)) {
1632                 netif_err(adapter, probe, adapter->netdev,
1633                           "Invalid MTU setting %d\n", new_mtu);
1634                 return -EINVAL;
1635         }
1636
1637         if (old_max_frame == max_frame)
1638                 return 0;
1639
1640         if (netif_running(netdev))
1641                 ixgb_down(adapter, true);
1642
1643         adapter->rx_buffer_len = max_frame + 8; /* + 8 for errata */
1644
1645         netdev->mtu = new_mtu;
1646
1647         if (netif_running(netdev))
1648                 ixgb_up(adapter);
1649
1650         return 0;
1651 }
1652
1653 /**
1654  * ixgb_update_stats - Update the board statistics counters.
1655  * @adapter: board private structure
1656  **/
1657
1658 void
1659 ixgb_update_stats(struct ixgb_adapter *adapter)
1660 {
1661         struct net_device *netdev = adapter->netdev;
1662         struct pci_dev *pdev = adapter->pdev;
1663
1664         /* Prevent stats update while adapter is being reset */
1665         if (pci_channel_offline(pdev))
1666                 return;
1667
1668         if ((netdev->flags & IFF_PROMISC) || (netdev->flags & IFF_ALLMULTI) ||
1669            (netdev_mc_count(netdev) > IXGB_MAX_NUM_MULTICAST_ADDRESSES)) {
1670                 u64 multi = IXGB_READ_REG(&adapter->hw, MPRCL);
1671                 u32 bcast_l = IXGB_READ_REG(&adapter->hw, BPRCL);
1672                 u32 bcast_h = IXGB_READ_REG(&adapter->hw, BPRCH);
1673                 u64 bcast = ((u64)bcast_h << 32) | bcast_l;
1674
1675                 multi |= ((u64)IXGB_READ_REG(&adapter->hw, MPRCH) << 32);
1676                 /* fix up multicast stats by removing broadcasts */
1677                 if (multi >= bcast)
1678                         multi -= bcast;
1679
1680                 adapter->stats.mprcl += (multi & 0xFFFFFFFF);
1681                 adapter->stats.mprch += (multi >> 32);
1682                 adapter->stats.bprcl += bcast_l;
1683                 adapter->stats.bprch += bcast_h;
1684         } else {
1685                 adapter->stats.mprcl += IXGB_READ_REG(&adapter->hw, MPRCL);
1686                 adapter->stats.mprch += IXGB_READ_REG(&adapter->hw, MPRCH);
1687                 adapter->stats.bprcl += IXGB_READ_REG(&adapter->hw, BPRCL);
1688                 adapter->stats.bprch += IXGB_READ_REG(&adapter->hw, BPRCH);
1689         }
1690         adapter->stats.tprl += IXGB_READ_REG(&adapter->hw, TPRL);
1691         adapter->stats.tprh += IXGB_READ_REG(&adapter->hw, TPRH);
1692         adapter->stats.gprcl += IXGB_READ_REG(&adapter->hw, GPRCL);
1693         adapter->stats.gprch += IXGB_READ_REG(&adapter->hw, GPRCH);
1694         adapter->stats.uprcl += IXGB_READ_REG(&adapter->hw, UPRCL);
1695         adapter->stats.uprch += IXGB_READ_REG(&adapter->hw, UPRCH);
1696         adapter->stats.vprcl += IXGB_READ_REG(&adapter->hw, VPRCL);
1697         adapter->stats.vprch += IXGB_READ_REG(&adapter->hw, VPRCH);
1698         adapter->stats.jprcl += IXGB_READ_REG(&adapter->hw, JPRCL);
1699         adapter->stats.jprch += IXGB_READ_REG(&adapter->hw, JPRCH);
1700         adapter->stats.gorcl += IXGB_READ_REG(&adapter->hw, GORCL);
1701         adapter->stats.gorch += IXGB_READ_REG(&adapter->hw, GORCH);
1702         adapter->stats.torl += IXGB_READ_REG(&adapter->hw, TORL);
1703         adapter->stats.torh += IXGB_READ_REG(&adapter->hw, TORH);
1704         adapter->stats.rnbc += IXGB_READ_REG(&adapter->hw, RNBC);
1705         adapter->stats.ruc += IXGB_READ_REG(&adapter->hw, RUC);
1706         adapter->stats.roc += IXGB_READ_REG(&adapter->hw, ROC);
1707         adapter->stats.rlec += IXGB_READ_REG(&adapter->hw, RLEC);
1708         adapter->stats.crcerrs += IXGB_READ_REG(&adapter->hw, CRCERRS);
1709         adapter->stats.icbc += IXGB_READ_REG(&adapter->hw, ICBC);
1710         adapter->stats.ecbc += IXGB_READ_REG(&adapter->hw, ECBC);
1711         adapter->stats.mpc += IXGB_READ_REG(&adapter->hw, MPC);
1712         adapter->stats.tptl += IXGB_READ_REG(&adapter->hw, TPTL);
1713         adapter->stats.tpth += IXGB_READ_REG(&adapter->hw, TPTH);
1714         adapter->stats.gptcl += IXGB_READ_REG(&adapter->hw, GPTCL);
1715         adapter->stats.gptch += IXGB_READ_REG(&adapter->hw, GPTCH);
1716         adapter->stats.bptcl += IXGB_READ_REG(&adapter->hw, BPTCL);
1717         adapter->stats.bptch += IXGB_READ_REG(&adapter->hw, BPTCH);
1718         adapter->stats.mptcl += IXGB_READ_REG(&adapter->hw, MPTCL);
1719         adapter->stats.mptch += IXGB_READ_REG(&adapter->hw, MPTCH);
1720         adapter->stats.uptcl += IXGB_READ_REG(&adapter->hw, UPTCL);
1721         adapter->stats.uptch += IXGB_READ_REG(&adapter->hw, UPTCH);
1722         adapter->stats.vptcl += IXGB_READ_REG(&adapter->hw, VPTCL);
1723         adapter->stats.vptch += IXGB_READ_REG(&adapter->hw, VPTCH);
1724         adapter->stats.jptcl += IXGB_READ_REG(&adapter->hw, JPTCL);
1725         adapter->stats.jptch += IXGB_READ_REG(&adapter->hw, JPTCH);
1726         adapter->stats.gotcl += IXGB_READ_REG(&adapter->hw, GOTCL);
1727         adapter->stats.gotch += IXGB_READ_REG(&adapter->hw, GOTCH);
1728         adapter->stats.totl += IXGB_READ_REG(&adapter->hw, TOTL);
1729         adapter->stats.toth += IXGB_READ_REG(&adapter->hw, TOTH);
1730         adapter->stats.dc += IXGB_READ_REG(&adapter->hw, DC);
1731         adapter->stats.plt64c += IXGB_READ_REG(&adapter->hw, PLT64C);
1732         adapter->stats.tsctc += IXGB_READ_REG(&adapter->hw, TSCTC);
1733         adapter->stats.tsctfc += IXGB_READ_REG(&adapter->hw, TSCTFC);
1734         adapter->stats.ibic += IXGB_READ_REG(&adapter->hw, IBIC);
1735         adapter->stats.rfc += IXGB_READ_REG(&adapter->hw, RFC);
1736         adapter->stats.lfc += IXGB_READ_REG(&adapter->hw, LFC);
1737         adapter->stats.pfrc += IXGB_READ_REG(&adapter->hw, PFRC);
1738         adapter->stats.pftc += IXGB_READ_REG(&adapter->hw, PFTC);
1739         adapter->stats.mcfrc += IXGB_READ_REG(&adapter->hw, MCFRC);
1740         adapter->stats.mcftc += IXGB_READ_REG(&adapter->hw, MCFTC);
1741         adapter->stats.xonrxc += IXGB_READ_REG(&adapter->hw, XONRXC);
1742         adapter->stats.xontxc += IXGB_READ_REG(&adapter->hw, XONTXC);
1743         adapter->stats.xoffrxc += IXGB_READ_REG(&adapter->hw, XOFFRXC);
1744         adapter->stats.xofftxc += IXGB_READ_REG(&adapter->hw, XOFFTXC);
1745         adapter->stats.rjc += IXGB_READ_REG(&adapter->hw, RJC);
1746
1747         /* Fill out the OS statistics structure */
1748
1749         netdev->stats.rx_packets = adapter->stats.gprcl;
1750         netdev->stats.tx_packets = adapter->stats.gptcl;
1751         netdev->stats.rx_bytes = adapter->stats.gorcl;
1752         netdev->stats.tx_bytes = adapter->stats.gotcl;
1753         netdev->stats.multicast = adapter->stats.mprcl;
1754         netdev->stats.collisions = 0;
1755
1756         /* ignore RLEC as it reports errors for padded (<64bytes) frames
1757          * with a length in the type/len field */
1758         netdev->stats.rx_errors =
1759             /* adapter->stats.rnbc + */ adapter->stats.crcerrs +
1760             adapter->stats.ruc +
1761             adapter->stats.roc /*+ adapter->stats.rlec */  +
1762             adapter->stats.icbc +
1763             adapter->stats.ecbc + adapter->stats.mpc;
1764
1765         /* see above
1766          * netdev->stats.rx_length_errors = adapter->stats.rlec;
1767          */
1768
1769         netdev->stats.rx_crc_errors = adapter->stats.crcerrs;
1770         netdev->stats.rx_fifo_errors = adapter->stats.mpc;
1771         netdev->stats.rx_missed_errors = adapter->stats.mpc;
1772         netdev->stats.rx_over_errors = adapter->stats.mpc;
1773
1774         netdev->stats.tx_errors = 0;
1775         netdev->stats.rx_frame_errors = 0;
1776         netdev->stats.tx_aborted_errors = 0;
1777         netdev->stats.tx_carrier_errors = 0;
1778         netdev->stats.tx_fifo_errors = 0;
1779         netdev->stats.tx_heartbeat_errors = 0;
1780         netdev->stats.tx_window_errors = 0;
1781 }
1782
1783 #define IXGB_MAX_INTR 10
1784 /**
1785  * ixgb_intr - Interrupt Handler
1786  * @irq: interrupt number
1787  * @data: pointer to a network interface device structure
1788  **/
1789
1790 static irqreturn_t
1791 ixgb_intr(int irq, void *data)
1792 {
1793         struct net_device *netdev = data;
1794         struct ixgb_adapter *adapter = netdev_priv(netdev);
1795         struct ixgb_hw *hw = &adapter->hw;
1796         u32 icr = IXGB_READ_REG(hw, ICR);
1797
1798         if (unlikely(!icr))
1799                 return IRQ_NONE;  /* Not our interrupt */
1800
1801         if (unlikely(icr & (IXGB_INT_RXSEQ | IXGB_INT_LSC)))
1802                 if (!test_bit(__IXGB_DOWN, &adapter->flags))
1803                         mod_timer(&adapter->watchdog_timer, jiffies);
1804
1805         if (napi_schedule_prep(&adapter->napi)) {
1806
1807                 /* Disable interrupts and register for poll. The flush
1808                   of the posted write is intentionally left out.
1809                 */
1810
1811                 IXGB_WRITE_REG(&adapter->hw, IMC, ~0);
1812                 __napi_schedule(&adapter->napi);
1813         }
1814         return IRQ_HANDLED;
1815 }
1816
1817 /**
1818  * ixgb_clean - NAPI Rx polling callback
1819  * @adapter: board private structure
1820  **/
1821
1822 static int
1823 ixgb_clean(struct napi_struct *napi, int budget)
1824 {
1825         struct ixgb_adapter *adapter = container_of(napi, struct ixgb_adapter, napi);
1826         int work_done = 0;
1827
1828         ixgb_clean_tx_irq(adapter);
1829         ixgb_clean_rx_irq(adapter, &work_done, budget);
1830
1831         /* If budget not fully consumed, exit the polling mode */
1832         if (work_done < budget) {
1833                 napi_complete(napi);
1834                 if (!test_bit(__IXGB_DOWN, &adapter->flags))
1835                         ixgb_irq_enable(adapter);
1836         }
1837
1838         return work_done;
1839 }
1840
1841 /**
1842  * ixgb_clean_tx_irq - Reclaim resources after transmit completes
1843  * @adapter: board private structure
1844  **/
1845
1846 static bool
1847 ixgb_clean_tx_irq(struct ixgb_adapter *adapter)
1848 {
1849         struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
1850         struct net_device *netdev = adapter->netdev;
1851         struct ixgb_tx_desc *tx_desc, *eop_desc;
1852         struct ixgb_buffer *buffer_info;
1853         unsigned int i, eop;
1854         bool cleaned = false;
1855
1856         i = tx_ring->next_to_clean;
1857         eop = tx_ring->buffer_info[i].next_to_watch;
1858         eop_desc = IXGB_TX_DESC(*tx_ring, eop);
1859
1860         while (eop_desc->status & IXGB_TX_DESC_STATUS_DD) {
1861
1862                 rmb(); /* read buffer_info after eop_desc */
1863                 for (cleaned = false; !cleaned; ) {
1864                         tx_desc = IXGB_TX_DESC(*tx_ring, i);
1865                         buffer_info = &tx_ring->buffer_info[i];
1866
1867                         if (tx_desc->popts &
1868                            (IXGB_TX_DESC_POPTS_TXSM |
1869                             IXGB_TX_DESC_POPTS_IXSM))
1870                                 adapter->hw_csum_tx_good++;
1871
1872                         ixgb_unmap_and_free_tx_resource(adapter, buffer_info);
1873
1874                         *(u32 *)&(tx_desc->status) = 0;
1875
1876                         cleaned = (i == eop);
1877                         if (++i == tx_ring->count) i = 0;
1878                 }
1879
1880                 eop = tx_ring->buffer_info[i].next_to_watch;
1881                 eop_desc = IXGB_TX_DESC(*tx_ring, eop);
1882         }
1883
1884         tx_ring->next_to_clean = i;
1885
1886         if (unlikely(cleaned && netif_carrier_ok(netdev) &&
1887                      IXGB_DESC_UNUSED(tx_ring) >= DESC_NEEDED)) {
1888                 /* Make sure that anybody stopping the queue after this
1889                  * sees the new next_to_clean. */
1890                 smp_mb();
1891
1892                 if (netif_queue_stopped(netdev) &&
1893                     !(test_bit(__IXGB_DOWN, &adapter->flags))) {
1894                         netif_wake_queue(netdev);
1895                         ++adapter->restart_queue;
1896                 }
1897         }
1898
1899         if (adapter->detect_tx_hung) {
1900                 /* detect a transmit hang in hardware, this serializes the
1901                  * check with the clearing of time_stamp and movement of i */
1902                 adapter->detect_tx_hung = false;
1903                 if (tx_ring->buffer_info[eop].time_stamp &&
1904                    time_after(jiffies, tx_ring->buffer_info[eop].time_stamp + HZ)
1905                    && !(IXGB_READ_REG(&adapter->hw, STATUS) &
1906                         IXGB_STATUS_TXOFF)) {
1907                         /* detected Tx unit hang */
1908                         netif_err(adapter, drv, adapter->netdev,
1909                                   "Detected Tx Unit Hang\n"
1910                                   "  TDH                  <%x>\n"
1911                                   "  TDT                  <%x>\n"
1912                                   "  next_to_use          <%x>\n"
1913                                   "  next_to_clean        <%x>\n"
1914                                   "buffer_info[next_to_clean]\n"
1915                                   "  time_stamp           <%lx>\n"
1916                                   "  next_to_watch        <%x>\n"
1917                                   "  jiffies              <%lx>\n"
1918                                   "  next_to_watch.status <%x>\n",
1919                                   IXGB_READ_REG(&adapter->hw, TDH),
1920                                   IXGB_READ_REG(&adapter->hw, TDT),
1921                                   tx_ring->next_to_use,
1922                                   tx_ring->next_to_clean,
1923                                   tx_ring->buffer_info[eop].time_stamp,
1924                                   eop,
1925                                   jiffies,
1926                                   eop_desc->status);
1927                         netif_stop_queue(netdev);
1928                 }
1929         }
1930
1931         return cleaned;
1932 }
1933
1934 /**
1935  * ixgb_rx_checksum - Receive Checksum Offload for 82597.
1936  * @adapter: board private structure
1937  * @rx_desc: receive descriptor
1938  * @sk_buff: socket buffer with received data
1939  **/
1940
1941 static void
1942 ixgb_rx_checksum(struct ixgb_adapter *adapter,
1943                  struct ixgb_rx_desc *rx_desc,
1944                  struct sk_buff *skb)
1945 {
1946         /* Ignore Checksum bit is set OR
1947          * TCP Checksum has not been calculated
1948          */
1949         if ((rx_desc->status & IXGB_RX_DESC_STATUS_IXSM) ||
1950            (!(rx_desc->status & IXGB_RX_DESC_STATUS_TCPCS))) {
1951                 skb_checksum_none_assert(skb);
1952                 return;
1953         }
1954
1955         /* At this point we know the hardware did the TCP checksum */
1956         /* now look at the TCP checksum error bit */
1957         if (rx_desc->errors & IXGB_RX_DESC_ERRORS_TCPE) {
1958                 /* let the stack verify checksum errors */
1959                 skb_checksum_none_assert(skb);
1960                 adapter->hw_csum_rx_error++;
1961         } else {
1962                 /* TCP checksum is good */
1963                 skb->ip_summed = CHECKSUM_UNNECESSARY;
1964                 adapter->hw_csum_rx_good++;
1965         }
1966 }
1967
1968 /*
1969  * this should improve performance for small packets with large amounts
1970  * of reassembly being done in the stack
1971  */
1972 static void ixgb_check_copybreak(struct net_device *netdev,
1973                                  struct ixgb_buffer *buffer_info,
1974                                  u32 length, struct sk_buff **skb)
1975 {
1976         struct sk_buff *new_skb;
1977
1978         if (length > copybreak)
1979                 return;
1980
1981         new_skb = netdev_alloc_skb_ip_align(netdev, length);
1982         if (!new_skb)
1983                 return;
1984
1985         skb_copy_to_linear_data_offset(new_skb, -NET_IP_ALIGN,
1986                                        (*skb)->data - NET_IP_ALIGN,
1987                                        length + NET_IP_ALIGN);
1988         /* save the skb in buffer_info as good */
1989         buffer_info->skb = *skb;
1990         *skb = new_skb;
1991 }
1992
1993 /**
1994  * ixgb_clean_rx_irq - Send received data up the network stack,
1995  * @adapter: board private structure
1996  **/
1997
1998 static bool
1999 ixgb_clean_rx_irq(struct ixgb_adapter *adapter, int *work_done, int work_to_do)
2000 {
2001         struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
2002         struct net_device *netdev = adapter->netdev;
2003         struct pci_dev *pdev = adapter->pdev;
2004         struct ixgb_rx_desc *rx_desc, *next_rxd;
2005         struct ixgb_buffer *buffer_info, *next_buffer, *next2_buffer;
2006         u32 length;
2007         unsigned int i, j;
2008         int cleaned_count = 0;
2009         bool cleaned = false;
2010
2011         i = rx_ring->next_to_clean;
2012         rx_desc = IXGB_RX_DESC(*rx_ring, i);
2013         buffer_info = &rx_ring->buffer_info[i];
2014
2015         while (rx_desc->status & IXGB_RX_DESC_STATUS_DD) {
2016                 struct sk_buff *skb;
2017                 u8 status;
2018
2019                 if (*work_done >= work_to_do)
2020                         break;
2021
2022                 (*work_done)++;
2023                 rmb();  /* read descriptor and rx_buffer_info after status DD */
2024                 status = rx_desc->status;
2025                 skb = buffer_info->skb;
2026                 buffer_info->skb = NULL;
2027
2028                 prefetch(skb->data - NET_IP_ALIGN);
2029
2030                 if (++i == rx_ring->count)
2031                         i = 0;
2032                 next_rxd = IXGB_RX_DESC(*rx_ring, i);
2033                 prefetch(next_rxd);
2034
2035                 j = i + 1;
2036                 if (j == rx_ring->count)
2037                         j = 0;
2038                 next2_buffer = &rx_ring->buffer_info[j];
2039                 prefetch(next2_buffer);
2040
2041                 next_buffer = &rx_ring->buffer_info[i];
2042
2043                 cleaned = true;
2044                 cleaned_count++;
2045
2046                 dma_unmap_single(&pdev->dev,
2047                                  buffer_info->dma,
2048                                  buffer_info->length,
2049                                  DMA_FROM_DEVICE);
2050                 buffer_info->dma = 0;
2051
2052                 length = le16_to_cpu(rx_desc->length);
2053                 rx_desc->length = 0;
2054
2055                 if (unlikely(!(status & IXGB_RX_DESC_STATUS_EOP))) {
2056
2057                         /* All receives must fit into a single buffer */
2058
2059                         pr_debug("Receive packet consumed multiple buffers length<%x>\n",
2060                                  length);
2061
2062                         dev_kfree_skb_irq(skb);
2063                         goto rxdesc_done;
2064                 }
2065
2066                 if (unlikely(rx_desc->errors &
2067                     (IXGB_RX_DESC_ERRORS_CE | IXGB_RX_DESC_ERRORS_SE |
2068                      IXGB_RX_DESC_ERRORS_P | IXGB_RX_DESC_ERRORS_RXE))) {
2069                         dev_kfree_skb_irq(skb);
2070                         goto rxdesc_done;
2071                 }
2072
2073                 ixgb_check_copybreak(netdev, buffer_info, length, &skb);
2074
2075                 /* Good Receive */
2076                 skb_put(skb, length);
2077
2078                 /* Receive Checksum Offload */
2079                 ixgb_rx_checksum(adapter, rx_desc, skb);
2080
2081                 skb->protocol = eth_type_trans(skb, netdev);
2082                 if (status & IXGB_RX_DESC_STATUS_VP)
2083                         __vlan_hwaccel_put_tag(skb,
2084                                                le16_to_cpu(rx_desc->special));
2085
2086                 netif_receive_skb(skb);
2087
2088 rxdesc_done:
2089                 /* clean up descriptor, might be written over by hw */
2090                 rx_desc->status = 0;
2091
2092                 /* return some buffers to hardware, one at a time is too slow */
2093                 if (unlikely(cleaned_count >= IXGB_RX_BUFFER_WRITE)) {
2094                         ixgb_alloc_rx_buffers(adapter, cleaned_count);
2095                         cleaned_count = 0;
2096                 }
2097
2098                 /* use prefetched values */
2099                 rx_desc = next_rxd;
2100                 buffer_info = next_buffer;
2101         }
2102
2103         rx_ring->next_to_clean = i;
2104
2105         cleaned_count = IXGB_DESC_UNUSED(rx_ring);
2106         if (cleaned_count)
2107                 ixgb_alloc_rx_buffers(adapter, cleaned_count);
2108
2109         return cleaned;
2110 }
2111
2112 /**
2113  * ixgb_alloc_rx_buffers - Replace used receive buffers
2114  * @adapter: address of board private structure
2115  **/
2116
2117 static void
2118 ixgb_alloc_rx_buffers(struct ixgb_adapter *adapter, int cleaned_count)
2119 {
2120         struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
2121         struct net_device *netdev = adapter->netdev;
2122         struct pci_dev *pdev = adapter->pdev;
2123         struct ixgb_rx_desc *rx_desc;
2124         struct ixgb_buffer *buffer_info;
2125         struct sk_buff *skb;
2126         unsigned int i;
2127         long cleancount;
2128
2129         i = rx_ring->next_to_use;
2130         buffer_info = &rx_ring->buffer_info[i];
2131         cleancount = IXGB_DESC_UNUSED(rx_ring);
2132
2133
2134         /* leave three descriptors unused */
2135         while (--cleancount > 2 && cleaned_count--) {
2136                 /* recycle! its good for you */
2137                 skb = buffer_info->skb;
2138                 if (skb) {
2139                         skb_trim(skb, 0);
2140                         goto map_skb;
2141                 }
2142
2143                 skb = netdev_alloc_skb_ip_align(netdev, adapter->rx_buffer_len);
2144                 if (unlikely(!skb)) {
2145                         /* Better luck next round */
2146                         adapter->alloc_rx_buff_failed++;
2147                         break;
2148                 }
2149
2150                 buffer_info->skb = skb;
2151                 buffer_info->length = adapter->rx_buffer_len;
2152 map_skb:
2153                 buffer_info->dma = dma_map_single(&pdev->dev,
2154                                                   skb->data,
2155                                                   adapter->rx_buffer_len,
2156                                                   DMA_FROM_DEVICE);
2157                 if (dma_mapping_error(&pdev->dev, buffer_info->dma)) {
2158                         adapter->alloc_rx_buff_failed++;
2159                         break;
2160                 }
2161
2162                 rx_desc = IXGB_RX_DESC(*rx_ring, i);
2163                 rx_desc->buff_addr = cpu_to_le64(buffer_info->dma);
2164                 /* guarantee DD bit not set now before h/w gets descriptor
2165                  * this is the rest of the workaround for h/w double
2166                  * writeback. */
2167                 rx_desc->status = 0;
2168
2169
2170                 if (++i == rx_ring->count)
2171                         i = 0;
2172                 buffer_info = &rx_ring->buffer_info[i];
2173         }
2174
2175         if (likely(rx_ring->next_to_use != i)) {
2176                 rx_ring->next_to_use = i;
2177                 if (unlikely(i-- == 0))
2178                         i = (rx_ring->count - 1);
2179
2180                 /* Force memory writes to complete before letting h/w
2181                  * know there are new descriptors to fetch.  (Only
2182                  * applicable for weak-ordered memory model archs, such
2183                  * as IA-64). */
2184                 wmb();
2185                 IXGB_WRITE_REG(&adapter->hw, RDT, i);
2186         }
2187 }
2188
2189 static void
2190 ixgb_vlan_strip_enable(struct ixgb_adapter *adapter)
2191 {
2192         u32 ctrl;
2193
2194         /* enable VLAN tag insert/strip */
2195         ctrl = IXGB_READ_REG(&adapter->hw, CTRL0);
2196         ctrl |= IXGB_CTRL0_VME;
2197         IXGB_WRITE_REG(&adapter->hw, CTRL0, ctrl);
2198 }
2199
2200 static void
2201 ixgb_vlan_strip_disable(struct ixgb_adapter *adapter)
2202 {
2203         u32 ctrl;
2204
2205         /* disable VLAN tag insert/strip */
2206         ctrl = IXGB_READ_REG(&adapter->hw, CTRL0);
2207         ctrl &= ~IXGB_CTRL0_VME;
2208         IXGB_WRITE_REG(&adapter->hw, CTRL0, ctrl);
2209 }
2210
2211 static int
2212 ixgb_vlan_rx_add_vid(struct net_device *netdev, u16 vid)
2213 {
2214         struct ixgb_adapter *adapter = netdev_priv(netdev);
2215         u32 vfta, index;
2216
2217         /* add VID to filter table */
2218
2219         index = (vid >> 5) & 0x7F;
2220         vfta = IXGB_READ_REG_ARRAY(&adapter->hw, VFTA, index);
2221         vfta |= (1 << (vid & 0x1F));
2222         ixgb_write_vfta(&adapter->hw, index, vfta);
2223         set_bit(vid, adapter->active_vlans);
2224
2225         return 0;
2226 }
2227
2228 static int
2229 ixgb_vlan_rx_kill_vid(struct net_device *netdev, u16 vid)
2230 {
2231         struct ixgb_adapter *adapter = netdev_priv(netdev);
2232         u32 vfta, index;
2233
2234         /* remove VID from filter table */
2235
2236         index = (vid >> 5) & 0x7F;
2237         vfta = IXGB_READ_REG_ARRAY(&adapter->hw, VFTA, index);
2238         vfta &= ~(1 << (vid & 0x1F));
2239         ixgb_write_vfta(&adapter->hw, index, vfta);
2240         clear_bit(vid, adapter->active_vlans);
2241
2242         return 0;
2243 }
2244
2245 static void
2246 ixgb_restore_vlan(struct ixgb_adapter *adapter)
2247 {
2248         u16 vid;
2249
2250         for_each_set_bit(vid, adapter->active_vlans, VLAN_N_VID)
2251                 ixgb_vlan_rx_add_vid(adapter->netdev, vid);
2252 }
2253
2254 #ifdef CONFIG_NET_POLL_CONTROLLER
2255 /*
2256  * Polling 'interrupt' - used by things like netconsole to send skbs
2257  * without having to re-enable interrupts. It's not called while
2258  * the interrupt routine is executing.
2259  */
2260
2261 static void ixgb_netpoll(struct net_device *dev)
2262 {
2263         struct ixgb_adapter *adapter = netdev_priv(dev);
2264
2265         disable_irq(adapter->pdev->irq);
2266         ixgb_intr(adapter->pdev->irq, dev);
2267         enable_irq(adapter->pdev->irq);
2268 }
2269 #endif
2270
2271 /**
2272  * ixgb_io_error_detected - called when PCI error is detected
2273  * @pdev:    pointer to pci device with error
2274  * @state:   pci channel state after error
2275  *
2276  * This callback is called by the PCI subsystem whenever
2277  * a PCI bus error is detected.
2278  */
2279 static pci_ers_result_t ixgb_io_error_detected(struct pci_dev *pdev,
2280                                                enum pci_channel_state state)
2281 {
2282         struct net_device *netdev = pci_get_drvdata(pdev);
2283         struct ixgb_adapter *adapter = netdev_priv(netdev);
2284
2285         netif_device_detach(netdev);
2286
2287         if (state == pci_channel_io_perm_failure)
2288                 return PCI_ERS_RESULT_DISCONNECT;
2289
2290         if (netif_running(netdev))
2291                 ixgb_down(adapter, true);
2292
2293         pci_disable_device(pdev);
2294
2295         /* Request a slot reset. */
2296         return PCI_ERS_RESULT_NEED_RESET;
2297 }
2298
2299 /**
2300  * ixgb_io_slot_reset - called after the pci bus has been reset.
2301  * @pdev    pointer to pci device with error
2302  *
2303  * This callback is called after the PCI bus has been reset.
2304  * Basically, this tries to restart the card from scratch.
2305  * This is a shortened version of the device probe/discovery code,
2306  * it resembles the first-half of the ixgb_probe() routine.
2307  */
2308 static pci_ers_result_t ixgb_io_slot_reset(struct pci_dev *pdev)
2309 {
2310         struct net_device *netdev = pci_get_drvdata(pdev);
2311         struct ixgb_adapter *adapter = netdev_priv(netdev);
2312
2313         if (pci_enable_device(pdev)) {
2314                 netif_err(adapter, probe, adapter->netdev,
2315                           "Cannot re-enable PCI device after reset\n");
2316                 return PCI_ERS_RESULT_DISCONNECT;
2317         }
2318
2319         /* Perform card reset only on one instance of the card */
2320         if (0 != PCI_FUNC (pdev->devfn))
2321                 return PCI_ERS_RESULT_RECOVERED;
2322
2323         pci_set_master(pdev);
2324
2325         netif_carrier_off(netdev);
2326         netif_stop_queue(netdev);
2327         ixgb_reset(adapter);
2328
2329         /* Make sure the EEPROM is good */
2330         if (!ixgb_validate_eeprom_checksum(&adapter->hw)) {
2331                 netif_err(adapter, probe, adapter->netdev,
2332                           "After reset, the EEPROM checksum is not valid\n");
2333                 return PCI_ERS_RESULT_DISCONNECT;
2334         }
2335         ixgb_get_ee_mac_addr(&adapter->hw, netdev->dev_addr);
2336         memcpy(netdev->perm_addr, netdev->dev_addr, netdev->addr_len);
2337
2338         if (!is_valid_ether_addr(netdev->perm_addr)) {
2339                 netif_err(adapter, probe, adapter->netdev,
2340                           "After reset, invalid MAC address\n");
2341                 return PCI_ERS_RESULT_DISCONNECT;
2342         }
2343
2344         return PCI_ERS_RESULT_RECOVERED;
2345 }
2346
2347 /**
2348  * ixgb_io_resume - called when its OK to resume normal operations
2349  * @pdev    pointer to pci device with error
2350  *
2351  * The error recovery driver tells us that its OK to resume
2352  * normal operation. Implementation resembles the second-half
2353  * of the ixgb_probe() routine.
2354  */
2355 static void ixgb_io_resume(struct pci_dev *pdev)
2356 {
2357         struct net_device *netdev = pci_get_drvdata(pdev);
2358         struct ixgb_adapter *adapter = netdev_priv(netdev);
2359
2360         pci_set_master(pdev);
2361
2362         if (netif_running(netdev)) {
2363                 if (ixgb_up(adapter)) {
2364                         pr_err("can't bring device back up after reset\n");
2365                         return;
2366                 }
2367         }
2368
2369         netif_device_attach(netdev);
2370         mod_timer(&adapter->watchdog_timer, jiffies);
2371 }
2372
2373 /* ixgb_main.c */