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   1 /*******************************************************************************
   2
   3
   4   Copyright(c) 1999 - 2005 Intel Corporation. All rights reserved.
   5
   6   This program is free software; you can redistribute it and/or modify it
   7   under the terms of the GNU General Public License as published by the Free
   8   Software Foundation; either version 2 of the License, or (at your option)
   9   any later version.
  10
  11   This program is distributed in the hope that it will be useful, but WITHOUT
  12   ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13   FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  14   more details.
  15
  16   You should have received a copy of the GNU General Public License along with
  17   this program; if not, write to the Free Software Foundation, Inc., 59
  18   Temple Place - Suite 330, Boston, MA  02111-1307, USA.
  19
  20   The full GNU General Public License is included in this distribution in the
  21   file called LICENSE.
  22
  23   Contact Information:
  24   Linux NICS <linux.nics@intel.com>
  25   Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
  26
  27 *******************************************************************************/
  28
  29 #include "ixgb.h"
  30
  31 /* Change Log
  32  * 1.0.96 04/19/05
  33  * - Make needlessly global code static -- bunk@stusta.de
  34  * - ethtool cleanup -- shemminger@osdl.org
  35  * - Support for MODULE_VERSION -- linville@tuxdriver.com
  36  * - add skb_header_cloned check to the tso path -- herbert@apana.org.au
  37  * 1.0.88 01/05/05
  38  * - include fix to the condition that determines when to quit NAPI - Robert Olsson
  39  * - use netif_poll_{disable/enable} to synchronize between NAPI and i/f up/down
  40  * 1.0.84 10/26/04
  41  * - reset buffer_info->dma in Tx resource cleanup logic
  42  * 1.0.83 10/12/04
  43  * - sparse cleanup - shemminger@osdl.org
  44  * - fix tx resource cleanup logic
  45  */
  46
  47 char ixgb_driver_name[] = "ixgb";
  48 char ixgb_driver_string[] = "Intel(R) PRO/10GbE Network Driver";
  49
  50 #ifndef CONFIG_IXGB_NAPI
  51 #define DRIVERNAPI
  52 #else
  53 #define DRIVERNAPI "-NAPI"
  54 #endif
  55 #define DRV_VERSION             "1.0.100-k2"DRIVERNAPI
  56 char ixgb_driver_version[] = DRV_VERSION;
  57 static char ixgb_copyright[] = "Copyright (c) 1999-2005 Intel Corporation.";
  58
  59 /* ixgb_pci_tbl - PCI Device ID Table
  60  *
  61  * Wildcard entries (PCI_ANY_ID) should come last
  62  * Last entry must be all 0s
  63  *
  64  * { Vendor ID, Device ID, SubVendor ID, SubDevice ID,
  65  *   Class, Class Mask, private data (not used) }
  66  */
  67 static struct pci_device_id ixgb_pci_tbl[] = {
  68         {INTEL_VENDOR_ID, IXGB_DEVICE_ID_82597EX,
  69          PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
  70         {INTEL_VENDOR_ID, IXGB_DEVICE_ID_82597EX_SR,
  71          PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
  72         {INTEL_VENDOR_ID, IXGB_DEVICE_ID_82597EX_LR,
  73          PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
  74
  75         /* required last entry */
  76         {0,}
  77 };
  78
  79 MODULE_DEVICE_TABLE(pci, ixgb_pci_tbl);
  80
  81 /* Local Function Prototypes */
  82
  83 int ixgb_up(struct ixgb_adapter *adapter);
  84 void ixgb_down(struct ixgb_adapter *adapter, boolean_t kill_watchdog);
  85 void ixgb_reset(struct ixgb_adapter *adapter);
  86 int ixgb_setup_tx_resources(struct ixgb_adapter *adapter);
  87 int ixgb_setup_rx_resources(struct ixgb_adapter *adapter);
  88 void ixgb_free_tx_resources(struct ixgb_adapter *adapter);
  89 void ixgb_free_rx_resources(struct ixgb_adapter *adapter);
  90 void ixgb_update_stats(struct ixgb_adapter *adapter);
  91
  92 static int ixgb_init_module(void);
  93 static void ixgb_exit_module(void);
  94 static int ixgb_probe(struct pci_dev *pdev, const struct pci_device_id *ent);
  95 static void __devexit ixgb_remove(struct pci_dev *pdev);
  96 static int ixgb_sw_init(struct ixgb_adapter *adapter);
  97 static int ixgb_open(struct net_device *netdev);
  98 static int ixgb_close(struct net_device *netdev);
  99 static void ixgb_configure_tx(struct ixgb_adapter *adapter);
 100 static void ixgb_configure_rx(struct ixgb_adapter *adapter);
 101 static void ixgb_setup_rctl(struct ixgb_adapter *adapter);
 102 static void ixgb_clean_tx_ring(struct ixgb_adapter *adapter);
 103 static void ixgb_clean_rx_ring(struct ixgb_adapter *adapter);
 104 static void ixgb_set_multi(struct net_device *netdev);
 105 static void ixgb_watchdog(unsigned long data);
 106 static int ixgb_xmit_frame(struct sk_buff *skb, struct net_device *netdev);
 107 static struct net_device_stats *ixgb_get_stats(struct net_device *netdev);
 108 static int ixgb_change_mtu(struct net_device *netdev, int new_mtu);
 109 static int ixgb_set_mac(struct net_device *netdev, void *p);
 110 static irqreturn_t ixgb_intr(int irq, void *data, struct pt_regs *regs);
 111 static boolean_t ixgb_clean_tx_irq(struct ixgb_adapter *adapter);
 112
 113 #ifdef CONFIG_IXGB_NAPI
 114 static int ixgb_clean(struct net_device *netdev, int *budget);
 115 static boolean_t ixgb_clean_rx_irq(struct ixgb_adapter *adapter,
 116                                    int *work_done, int work_to_do);
 117 #else
 118 static boolean_t ixgb_clean_rx_irq(struct ixgb_adapter *adapter);
 119 #endif
 120 static void ixgb_alloc_rx_buffers(struct ixgb_adapter *adapter);
 121 void ixgb_set_ethtool_ops(struct net_device *netdev);
 122 static void ixgb_tx_timeout(struct net_device *dev);
 123 static void ixgb_tx_timeout_task(struct net_device *dev);
 124 static void ixgb_vlan_rx_register(struct net_device *netdev,
 125                                   struct vlan_group *grp);
 126 static void ixgb_vlan_rx_add_vid(struct net_device *netdev, uint16_t vid);
 127 static void ixgb_vlan_rx_kill_vid(struct net_device *netdev, uint16_t vid);
 128 static void ixgb_restore_vlan(struct ixgb_adapter *adapter);
 129
 130 #ifdef CONFIG_NET_POLL_CONTROLLER
 131 /* for netdump / net console */
 132 static void ixgb_netpoll(struct net_device *dev);
 133 #endif
 134
 135 /* Exported from other modules */
 136
 137 extern void ixgb_check_options(struct ixgb_adapter *adapter);
 138
 139 static struct pci_driver ixgb_driver = {
 140         .name     = ixgb_driver_name,
 141         .id_table = ixgb_pci_tbl,
 142         .probe    = ixgb_probe,
 143         .remove   = __devexit_p(ixgb_remove),
 144 };
 145
 146 MODULE_AUTHOR("Intel Corporation, <linux.nics@intel.com>");
 147 MODULE_DESCRIPTION("Intel(R) PRO/10GbE Network Driver");
 148 MODULE_LICENSE("GPL");
 149 MODULE_VERSION(DRV_VERSION);
 150
 151 /* some defines for controlling descriptor fetches in h/w */
 152 #define RXDCTL_WTHRESH_DEFAULT 16       /* chip writes back at this many or RXT0 */
 153 #define RXDCTL_PTHRESH_DEFAULT 0                /* chip considers prefech below
 154                                                  * this */
 155 #define RXDCTL_HTHRESH_DEFAULT 0                /* chip will only prefetch if tail
 156                                                  * is pushed this many descriptors
 157                                                  * from head */
 158
 159 /**
 160  * ixgb_init_module - Driver Registration Routine
 161  *
 162  * ixgb_init_module is the first routine called when the driver is
 163  * loaded. All it does is register with the PCI subsystem.
 164  **/
 165
 166 static int __init
 167 ixgb_init_module(void)
 168 {
 169         printk(KERN_INFO "%s - version %s\n",
 170                ixgb_driver_string, ixgb_driver_version);
 171
 172         printk(KERN_INFO "%s\n", ixgb_copyright);
 173
 174         return pci_module_init(&ixgb_driver);
 175 }
 176
 177 module_init(ixgb_init_module);
 178
 179 /**
 180  * ixgb_exit_module - Driver Exit Cleanup Routine
 181  *
 182  * ixgb_exit_module is called just before the driver is removed
 183  * from memory.
 184  **/
 185
 186 static void __exit
 187 ixgb_exit_module(void)
 188 {
 189         pci_unregister_driver(&ixgb_driver);
 190 }
 191
 192 module_exit(ixgb_exit_module);
 193
 194 /**
 195  * ixgb_irq_disable - Mask off interrupt generation on the NIC
 196  * @adapter: board private structure
 197  **/
 198
 199 static inline void
 200 ixgb_irq_disable(struct ixgb_adapter *adapter)
 201 {
 202         atomic_inc(&adapter->irq_sem);
 203         IXGB_WRITE_REG(&adapter->hw, IMC, ~0);
 204         IXGB_WRITE_FLUSH(&adapter->hw);
 205         synchronize_irq(adapter->pdev->irq);
 206 }
 207
 208 /**
 209  * ixgb_irq_enable - Enable default interrupt generation settings
 210  * @adapter: board private structure
 211  **/
 212
 213 static inline void
 214 ixgb_irq_enable(struct ixgb_adapter *adapter)
 215 {
 216         if(atomic_dec_and_test(&adapter->irq_sem)) {
 217                 IXGB_WRITE_REG(&adapter->hw, IMS,
 218                                IXGB_INT_RXT0 | IXGB_INT_RXDMT0 | IXGB_INT_TXDW |
 219                                IXGB_INT_LSC);
 220                 IXGB_WRITE_FLUSH(&adapter->hw);
 221         }
 222 }
 223
 224 int
 225 ixgb_up(struct ixgb_adapter *adapter)
 226 {
 227         struct net_device *netdev = adapter->netdev;
 228         int err;
 229         int max_frame = netdev->mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;
 230         struct ixgb_hw *hw = &adapter->hw;
 231
 232         /* hardware has been reset, we need to reload some things */
 233
 234         ixgb_set_multi(netdev);
 235
 236         ixgb_restore_vlan(adapter);
 237
 238         ixgb_configure_tx(adapter);
 239         ixgb_setup_rctl(adapter);
 240         ixgb_configure_rx(adapter);
 241         ixgb_alloc_rx_buffers(adapter);
 242
 243 #ifdef CONFIG_PCI_MSI
 244         {
 245         boolean_t pcix = (IXGB_READ_REG(&adapter->hw, STATUS) &
 246                                                   IXGB_STATUS_PCIX_MODE) ? TRUE : FALSE;
 247         adapter->have_msi = TRUE;
 248
 249         if (!pcix)
 250            adapter->have_msi = FALSE;
 251         else if((err = pci_enable_msi(adapter->pdev))) {
 252                 printk (KERN_ERR
 253                  "Unable to allocate MSI interrupt Error: %d\n", err);
 254                 adapter->have_msi = FALSE;
 255                 /* proceed to try to request regular interrupt */
 256         }
 257         }
 258
 259 #endif
 260         if((err = request_irq(adapter->pdev->irq, &ixgb_intr,
 261                                   SA_SHIRQ | SA_SAMPLE_RANDOM,
 262                                   netdev->name, netdev)))
 263                 return err;
 264
 265         /* disable interrupts and get the hardware into a known state */
 266         IXGB_WRITE_REG(&adapter->hw, IMC, 0xffffffff);
 267
 268         if((hw->max_frame_size != max_frame) ||
 269                 (hw->max_frame_size !=
 270                 (IXGB_READ_REG(hw, MFS) >> IXGB_MFS_SHIFT))) {
 271
 272                 hw->max_frame_size = max_frame;
 273
 274                 IXGB_WRITE_REG(hw, MFS, hw->max_frame_size << IXGB_MFS_SHIFT);
 275
 276                 if(hw->max_frame_size >
 277                    IXGB_MAX_ENET_FRAME_SIZE_WITHOUT_FCS + ENET_FCS_LENGTH) {
 278                         uint32_t ctrl0 = IXGB_READ_REG(hw, CTRL0);
 279
 280                         if(!(ctrl0 & IXGB_CTRL0_JFE)) {
 281                                 ctrl0 |= IXGB_CTRL0_JFE;
 282                                 IXGB_WRITE_REG(hw, CTRL0, ctrl0);
 283                         }
 284                 }
 285         }
 286
 287         mod_timer(&adapter->watchdog_timer, jiffies);
 288         ixgb_irq_enable(adapter);
 289
 290 #ifdef CONFIG_IXGB_NAPI
 291         netif_poll_enable(netdev);
 292 #endif
 293         return 0;
 294 }
 295
 296 void
 297 ixgb_down(struct ixgb_adapter *adapter, boolean_t kill_watchdog)
 298 {
 299         struct net_device *netdev = adapter->netdev;
 300
 301         ixgb_irq_disable(adapter);
 302         free_irq(adapter->pdev->irq, netdev);
 303 #ifdef CONFIG_PCI_MSI
 304         if(adapter->have_msi == TRUE)
 305                 pci_disable_msi(adapter->pdev);
 306
 307 #endif
 308         if(kill_watchdog)
 309                 del_timer_sync(&adapter->watchdog_timer);
 310 #ifdef CONFIG_IXGB_NAPI
 311         netif_poll_disable(netdev);
 312 #endif
 313         adapter->link_speed = 0;
 314         adapter->link_duplex = 0;
 315         netif_carrier_off(netdev);
 316         netif_stop_queue(netdev);
 317
 318         ixgb_reset(adapter);
 319         ixgb_clean_tx_ring(adapter);
 320         ixgb_clean_rx_ring(adapter);
 321 }
 322
 323 void
 324 ixgb_reset(struct ixgb_adapter *adapter)
 325 {
 326
 327         ixgb_adapter_stop(&adapter->hw);
 328         if(!ixgb_init_hw(&adapter->hw))
 329                 IXGB_DBG("ixgb_init_hw failed.\n");
 330 }
 331
 332 /**
 333  * ixgb_probe - Device Initialization Routine
 334  * @pdev: PCI device information struct
 335  * @ent: entry in ixgb_pci_tbl
 336  *
 337  * Returns 0 on success, negative on failure
 338  *
 339  * ixgb_probe initializes an adapter identified by a pci_dev structure.
 340  * The OS initialization, configuring of the adapter private structure,
 341  * and a hardware reset occur.
 342  **/
 343
 344 static int __devinit
 345 ixgb_probe(struct pci_dev *pdev,
 346                 const struct pci_device_id *ent)
 347 {
 348         struct net_device *netdev = NULL;
 349         struct ixgb_adapter *adapter;
 350         static int cards_found = 0;
 351         unsigned long mmio_start;
 352         int mmio_len;
 353         int pci_using_dac;
 354         int i;
 355         int err;
 356
 357         if((err = pci_enable_device(pdev)))
 358                 return err;
 359
 360         if(!(err = pci_set_dma_mask(pdev, DMA_64BIT_MASK))) {
 361                 pci_using_dac = 1;
 362         } else {
 363                 if((err = pci_set_dma_mask(pdev, DMA_32BIT_MASK))) {
 364                         IXGB_ERR("No usable DMA configuration, aborting\n");
 365                         return err;
 366                 }
 367                 pci_using_dac = 0;
 368         }
 369
 370         if((err = pci_request_regions(pdev, ixgb_driver_name)))
 371                 return err;
 372
 373         pci_set_master(pdev);
 374
 375         netdev = alloc_etherdev(sizeof(struct ixgb_adapter));
 376         if(!netdev) {
 377                 err = -ENOMEM;
 378                 goto err_alloc_etherdev;
 379         }
 380
 381         SET_MODULE_OWNER(netdev);
 382         SET_NETDEV_DEV(netdev, &pdev->dev);
 383
 384         pci_set_drvdata(pdev, netdev);
 385         adapter = netdev_priv(netdev);
 386         adapter->netdev = netdev;
 387         adapter->pdev = pdev;
 388         adapter->hw.back = adapter;
 389
 390         mmio_start = pci_resource_start(pdev, BAR_0);
 391         mmio_len = pci_resource_len(pdev, BAR_0);
 392
 393         adapter->hw.hw_addr = ioremap(mmio_start, mmio_len);
 394         if(!adapter->hw.hw_addr) {
 395                 err = -EIO;
 396                 goto err_ioremap;
 397         }
 398
 399         for(i = BAR_1; i <= BAR_5; i++) {
 400                 if(pci_resource_len(pdev, i) == 0)
 401                         continue;
 402                 if(pci_resource_flags(pdev, i) & IORESOURCE_IO) {
 403                         adapter->hw.io_base = pci_resource_start(pdev, i);
 404                         break;
 405                 }
 406         }
 407
 408         netdev->open = &ixgb_open;
 409         netdev->stop = &ixgb_close;
 410         netdev->hard_start_xmit = &ixgb_xmit_frame;
 411         netdev->get_stats = &ixgb_get_stats;
 412         netdev->set_multicast_list = &ixgb_set_multi;
 413         netdev->set_mac_address = &ixgb_set_mac;
 414         netdev->change_mtu = &ixgb_change_mtu;
 415         ixgb_set_ethtool_ops(netdev);
 416         netdev->tx_timeout = &ixgb_tx_timeout;
 417         netdev->watchdog_timeo = HZ;
 418 #ifdef CONFIG_IXGB_NAPI
 419         netdev->poll = &ixgb_clean;
 420         netdev->weight = 64;
 421 #endif
 422         netdev->vlan_rx_register = ixgb_vlan_rx_register;
 423         netdev->vlan_rx_add_vid = ixgb_vlan_rx_add_vid;
 424         netdev->vlan_rx_kill_vid = ixgb_vlan_rx_kill_vid;
 425 #ifdef CONFIG_NET_POLL_CONTROLLER
 426         netdev->poll_controller = ixgb_netpoll;
 427 #endif
 428
 429         netdev->mem_start = mmio_start;
 430         netdev->mem_end = mmio_start + mmio_len;
 431         netdev->base_addr = adapter->hw.io_base;
 432
 433         adapter->bd_number = cards_found;
 434         adapter->link_speed = 0;
 435         adapter->link_duplex = 0;
 436
 437         /* setup the private structure */
 438
 439         if((err = ixgb_sw_init(adapter)))
 440                 goto err_sw_init;
 441
 442         netdev->features = NETIF_F_SG |
 443                            NETIF_F_HW_CSUM |
 444                            NETIF_F_HW_VLAN_TX |
 445                            NETIF_F_HW_VLAN_RX |
 446                            NETIF_F_HW_VLAN_FILTER;
 447 #ifdef NETIF_F_TSO
 448         netdev->features |= NETIF_F_TSO;
 449 #endif
 450
 451         if(pci_using_dac)
 452                 netdev->features |= NETIF_F_HIGHDMA;
 453
 454         /* make sure the EEPROM is good */
 455
 456         if(!ixgb_validate_eeprom_checksum(&adapter->hw)) {
 457                 printk(KERN_ERR "The EEPROM Checksum Is Not Valid\n");
 458                 err = -EIO;
 459                 goto err_eeprom;
 460         }
 461
 462         ixgb_get_ee_mac_addr(&adapter->hw, netdev->dev_addr);
 463
 464         if(!is_valid_ether_addr(netdev->dev_addr)) {
 465                 err = -EIO;
 466                 goto err_eeprom;
 467         }
 468
 469         adapter->part_num = ixgb_get_ee_pba_number(&adapter->hw);
 470
 471         init_timer(&adapter->watchdog_timer);
 472         adapter->watchdog_timer.function = &ixgb_watchdog;
 473         adapter->watchdog_timer.data = (unsigned long)adapter;
 474
 475         INIT_WORK(&adapter->tx_timeout_task,
 476                   (void (*)(void *))ixgb_tx_timeout_task, netdev);
 477
 478         if((err = register_netdev(netdev)))
 479                 goto err_register;
 480
 481         /* we're going to reset, so assume we have no link for now */
 482
 483         netif_carrier_off(netdev);
 484         netif_stop_queue(netdev);
 485
 486         printk(KERN_INFO "%s: Intel(R) PRO/10GbE Network Connection\n",
 487                    netdev->name);
 488         ixgb_check_options(adapter);
 489         /* reset the hardware with the new settings */
 490
 491         ixgb_reset(adapter);
 492
 493         cards_found++;
 494         return 0;
 495
 496 err_register:
 497 err_sw_init:
 498 err_eeprom:
 499         iounmap(adapter->hw.hw_addr);
 500 err_ioremap:
 501         free_netdev(netdev);
 502 err_alloc_etherdev:
 503         pci_release_regions(pdev);
 504         return err;
 505 }
 506
 507 /**
 508  * ixgb_remove - Device Removal Routine
 509  * @pdev: PCI device information struct
 510  *
 511  * ixgb_remove is called by the PCI subsystem to alert the driver
 512  * that it should release a PCI device.  The could be caused by a
 513  * Hot-Plug event, or because the driver is going to be removed from
 514  * memory.
 515  **/
 516
 517 static void __devexit
 518 ixgb_remove(struct pci_dev *pdev)
 519 {
 520         struct net_device *netdev = pci_get_drvdata(pdev);
 521         struct ixgb_adapter *adapter = netdev_priv(netdev);
 522
 523         unregister_netdev(netdev);
 524
 525         iounmap(adapter->hw.hw_addr);
 526         pci_release_regions(pdev);
 527
 528         free_netdev(netdev);
 529 }
 530
 531 /**
 532  * ixgb_sw_init - Initialize general software structures (struct ixgb_adapter)
 533  * @adapter: board private structure to initialize
 534  *
 535  * ixgb_sw_init initializes the Adapter private data structure.
 536  * Fields are initialized based on PCI device information and
 537  * OS network device settings (MTU size).
 538  **/
 539
 540 static int __devinit
 541 ixgb_sw_init(struct ixgb_adapter *adapter)
 542 {
 543         struct ixgb_hw *hw = &adapter->hw;
 544         struct net_device *netdev = adapter->netdev;
 545         struct pci_dev *pdev = adapter->pdev;
 546
 547         /* PCI config space info */
 548
 549         hw->vendor_id = pdev->vendor;
 550         hw->device_id = pdev->device;
 551         hw->subsystem_vendor_id = pdev->subsystem_vendor;
 552         hw->subsystem_id = pdev->subsystem_device;
 553
 554         adapter->rx_buffer_len = IXGB_RXBUFFER_2048;
 555
 556         hw->max_frame_size = netdev->mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;
 557
 558         if((hw->device_id == IXGB_DEVICE_ID_82597EX)
 559            ||(hw->device_id == IXGB_DEVICE_ID_82597EX_LR)
 560            ||(hw->device_id == IXGB_DEVICE_ID_82597EX_SR))
 561                         hw->mac_type = ixgb_82597;
 562         else {
 563                 /* should never have loaded on this device */
 564                 printk(KERN_ERR "ixgb: unsupported device id\n");
 565         }
 566
 567         /* enable flow control to be programmed */
 568         hw->fc.send_xon = 1;
 569
 570         atomic_set(&adapter->irq_sem, 1);
 571         spin_lock_init(&adapter->tx_lock);
 572
 573         return 0;
 574 }
 575
 576 /**
 577  * ixgb_open - Called when a network interface is made active
 578  * @netdev: network interface device structure
 579  *
 580  * Returns 0 on success, negative value on failure
 581  *
 582  * The open entry point is called when a network interface is made
 583  * active by the system (IFF_UP).  At this point all resources needed
 584  * for transmit and receive operations are allocated, the interrupt
 585  * handler is registered with the OS, the watchdog timer is started,
 586  * and the stack is notified that the interface is ready.
 587  **/
 588
 589 static int
 590 ixgb_open(struct net_device *netdev)
 591 {
 592         struct ixgb_adapter *adapter = netdev_priv(netdev);
 593         int err;
 594
 595         /* allocate transmit descriptors */
 596
 597         if((err = ixgb_setup_tx_resources(adapter)))
 598                 goto err_setup_tx;
 599
 600         /* allocate receive descriptors */
 601
 602         if((err = ixgb_setup_rx_resources(adapter)))
 603                 goto err_setup_rx;
 604
 605         if((err = ixgb_up(adapter)))
 606                 goto err_up;
 607
 608         return 0;
 609
 610 err_up:
 611         ixgb_free_rx_resources(adapter);
 612 err_setup_rx:
 613         ixgb_free_tx_resources(adapter);
 614 err_setup_tx:
 615         ixgb_reset(adapter);
 616
 617         return err;
 618 }
 619
 620 /**
 621  * ixgb_close - Disables a network interface
 622  * @netdev: network interface device structure
 623  *
 624  * Returns 0, this is not allowed to fail
 625  *
 626  * The close entry point is called when an interface is de-activated
 627  * by the OS.  The hardware is still under the drivers control, but
 628  * needs to be disabled.  A global MAC reset is issued to stop the
 629  * hardware, and all transmit and receive resources are freed.
 630  **/
 631
 632 static int
 633 ixgb_close(struct net_device *netdev)
 634 {
 635         struct ixgb_adapter *adapter = netdev_priv(netdev);
 636
 637         ixgb_down(adapter, TRUE);
 638
 639         ixgb_free_tx_resources(adapter);
 640         ixgb_free_rx_resources(adapter);
 641
 642         return 0;
 643 }
 644
 645 /**
 646  * ixgb_setup_tx_resources - allocate Tx resources (Descriptors)
 647  * @adapter: board private structure
 648  *
 649  * Return 0 on success, negative on failure
 650  **/
 651
 652 int
 653 ixgb_setup_tx_resources(struct ixgb_adapter *adapter)
 654 {
 655         struct ixgb_desc_ring *txdr = &adapter->tx_ring;
 656         struct pci_dev *pdev = adapter->pdev;
 657         int size;
 658
 659         size = sizeof(struct ixgb_buffer) * txdr->count;
 660         txdr->buffer_info = vmalloc(size);
 661         if(!txdr->buffer_info) {
 662                 return -ENOMEM;
 663         }
 664         memset(txdr->buffer_info, 0, size);
 665
 666         /* round up to nearest 4K */
 667
 668         txdr->size = txdr->count * sizeof(struct ixgb_tx_desc);
 669         IXGB_ROUNDUP(txdr->size, 4096);
 670
 671         txdr->desc = pci_alloc_consistent(pdev, txdr->size, &txdr->dma);
 672         if(!txdr->desc) {
 673                 vfree(txdr->buffer_info);
 674                 return -ENOMEM;
 675         }
 676         memset(txdr->desc, 0, txdr->size);
 677
 678         txdr->next_to_use = 0;
 679         txdr->next_to_clean = 0;
 680
 681         return 0;
 682 }
 683
 684 /**
 685  * ixgb_configure_tx - Configure 82597 Transmit Unit after Reset.
 686  * @adapter: board private structure
 687  *
 688  * Configure the Tx unit of the MAC after a reset.
 689  **/
 690
 691 static void
 692 ixgb_configure_tx(struct ixgb_adapter *adapter)
 693 {
 694         uint64_t tdba = adapter->tx_ring.dma;
 695         uint32_t tdlen = adapter->tx_ring.count * sizeof(struct ixgb_tx_desc);
 696         uint32_t tctl;
 697         struct ixgb_hw *hw = &adapter->hw;
 698
 699         /* Setup the Base and Length of the Tx Descriptor Ring
 700          * tx_ring.dma can be either a 32 or 64 bit value
 701          */
 702
 703         IXGB_WRITE_REG(hw, TDBAL, (tdba & 0x00000000ffffffffULL));
 704         IXGB_WRITE_REG(hw, TDBAH, (tdba >> 32));
 705
 706         IXGB_WRITE_REG(hw, TDLEN, tdlen);
 707
 708         /* Setup the HW Tx Head and Tail descriptor pointers */
 709
 710         IXGB_WRITE_REG(hw, TDH, 0);
 711         IXGB_WRITE_REG(hw, TDT, 0);
 712
 713         /* don't set up txdctl, it induces performance problems if configured
 714          * incorrectly */
 715         /* Set the Tx Interrupt Delay register */
 716
 717         IXGB_WRITE_REG(hw, TIDV, adapter->tx_int_delay);
 718
 719         /* Program the Transmit Control Register */
 720
 721         tctl = IXGB_TCTL_TCE | IXGB_TCTL_TXEN | IXGB_TCTL_TPDE;
 722         IXGB_WRITE_REG(hw, TCTL, tctl);
 723
 724         /* Setup Transmit Descriptor Settings for this adapter */
 725         adapter->tx_cmd_type =
 726                 IXGB_TX_DESC_TYPE
 727                 | (adapter->tx_int_delay_enable ? IXGB_TX_DESC_CMD_IDE : 0);
 728 }
 729
 730 /**
 731  * ixgb_setup_rx_resources - allocate Rx resources (Descriptors)
 732  * @adapter: board private structure
 733  *
 734  * Returns 0 on success, negative on failure
 735  **/
 736
 737 int
 738 ixgb_setup_rx_resources(struct ixgb_adapter *adapter)
 739 {
 740         struct ixgb_desc_ring *rxdr = &adapter->rx_ring;
 741         struct pci_dev *pdev = adapter->pdev;
 742         int size;
 743
 744         size = sizeof(struct ixgb_buffer) * rxdr->count;
 745         rxdr->buffer_info = vmalloc(size);
 746         if(!rxdr->buffer_info) {
 747                 return -ENOMEM;
 748         }
 749         memset(rxdr->buffer_info, 0, size);
 750
 751         /* Round up to nearest 4K */
 752
 753         rxdr->size = rxdr->count * sizeof(struct ixgb_rx_desc);
 754         IXGB_ROUNDUP(rxdr->size, 4096);
 755
 756         rxdr->desc = pci_alloc_consistent(pdev, rxdr->size, &rxdr->dma);
 757
 758         if(!rxdr->desc) {
 759                 vfree(rxdr->buffer_info);
 760                 return -ENOMEM;
 761         }
 762         memset(rxdr->desc, 0, rxdr->size);
 763
 764         rxdr->next_to_clean = 0;
 765         rxdr->next_to_use = 0;
 766
 767         return 0;
 768 }
 769
 770 /**
 771  * ixgb_setup_rctl - configure the receive control register
 772  * @adapter: Board private structure
 773  **/
 774
 775 static void
 776 ixgb_setup_rctl(struct ixgb_adapter *adapter)
 777 {
 778         uint32_t rctl;
 779
 780         rctl = IXGB_READ_REG(&adapter->hw, RCTL);
 781
 782         rctl &= ~(3 << IXGB_RCTL_MO_SHIFT);
 783
 784         rctl |=
 785                 IXGB_RCTL_BAM | IXGB_RCTL_RDMTS_1_2 |
 786                 IXGB_RCTL_RXEN | IXGB_RCTL_CFF |
 787                 (adapter->hw.mc_filter_type << IXGB_RCTL_MO_SHIFT);
 788
 789         rctl |= IXGB_RCTL_SECRC;
 790
 791         switch (adapter->rx_buffer_len) {
 792         case IXGB_RXBUFFER_2048:
 793         default:
 794                 rctl |= IXGB_RCTL_BSIZE_2048;
 795                 break;
 796         case IXGB_RXBUFFER_4096:
 797                 rctl |= IXGB_RCTL_BSIZE_4096;
 798                 break;
 799         case IXGB_RXBUFFER_8192:
 800                 rctl |= IXGB_RCTL_BSIZE_8192;
 801                 break;
 802         case IXGB_RXBUFFER_16384:
 803                 rctl |= IXGB_RCTL_BSIZE_16384;
 804                 break;
 805         }
 806
 807         IXGB_WRITE_REG(&adapter->hw, RCTL, rctl);
 808 }
 809
 810 /**
 811  * ixgb_configure_rx - Configure 82597 Receive Unit after Reset.
 812  * @adapter: board private structure
 813  *
 814  * Configure the Rx unit of the MAC after a reset.
 815  **/
 816
 817 static void
 818 ixgb_configure_rx(struct ixgb_adapter *adapter)
 819 {
 820         uint64_t rdba = adapter->rx_ring.dma;
 821         uint32_t rdlen = adapter->rx_ring.count * sizeof(struct ixgb_rx_desc);
 822         struct ixgb_hw *hw = &adapter->hw;
 823         uint32_t rctl;
 824         uint32_t rxcsum;
 825         uint32_t rxdctl;
 826
 827         /* make sure receives are disabled while setting up the descriptors */
 828
 829         rctl = IXGB_READ_REG(hw, RCTL);
 830         IXGB_WRITE_REG(hw, RCTL, rctl & ~IXGB_RCTL_RXEN);
 831
 832         /* set the Receive Delay Timer Register */
 833
 834         IXGB_WRITE_REG(hw, RDTR, adapter->rx_int_delay);
 835
 836         /* Setup the Base and Length of the Rx Descriptor Ring */
 837
 838         IXGB_WRITE_REG(hw, RDBAL, (rdba & 0x00000000ffffffffULL));
 839         IXGB_WRITE_REG(hw, RDBAH, (rdba >> 32));
 840
 841         IXGB_WRITE_REG(hw, RDLEN, rdlen);
 842
 843         /* Setup the HW Rx Head and Tail Descriptor Pointers */
 844         IXGB_WRITE_REG(hw, RDH, 0);
 845         IXGB_WRITE_REG(hw, RDT, 0);
 846
 847         /* set up pre-fetching of receive buffers so we get some before we
 848          * run out (default hardware behavior is to run out before fetching
 849          * more).  This sets up to fetch if HTHRESH rx descriptors are avail
 850          * and the descriptors in hw cache are below PTHRESH.  This avoids
 851          * the hardware behavior of fetching <=512 descriptors in a single
 852          * burst that pre-empts all other activity, usually causing fifo
 853          * overflows. */
 854         /* use WTHRESH to burst write 16 descriptors or burst when RXT0 */
 855         rxdctl = RXDCTL_WTHRESH_DEFAULT << IXGB_RXDCTL_WTHRESH_SHIFT |
 856                  RXDCTL_HTHRESH_DEFAULT << IXGB_RXDCTL_HTHRESH_SHIFT |
 857                  RXDCTL_PTHRESH_DEFAULT << IXGB_RXDCTL_PTHRESH_SHIFT;
 858         IXGB_WRITE_REG(hw, RXDCTL, rxdctl);
 859
 860         /* Enable Receive Checksum Offload for TCP and UDP */
 861         if(adapter->rx_csum == TRUE) {
 862                 rxcsum = IXGB_READ_REG(hw, RXCSUM);
 863                 rxcsum |= IXGB_RXCSUM_TUOFL;
 864                 IXGB_WRITE_REG(hw, RXCSUM, rxcsum);
 865         }
 866
 867         /* Enable Receives */
 868
 869         IXGB_WRITE_REG(hw, RCTL, rctl);
 870 }
 871
 872 /**
 873  * ixgb_free_tx_resources - Free Tx Resources
 874  * @adapter: board private structure
 875  *
 876  * Free all transmit software resources
 877  **/
 878
 879 void
 880 ixgb_free_tx_resources(struct ixgb_adapter *adapter)
 881 {
 882         struct pci_dev *pdev = adapter->pdev;
 883
 884         ixgb_clean_tx_ring(adapter);
 885
 886         vfree(adapter->tx_ring.buffer_info);
 887         adapter->tx_ring.buffer_info = NULL;
 888
 889         pci_free_consistent(pdev, adapter->tx_ring.size,
 890                             adapter->tx_ring.desc, adapter->tx_ring.dma);
 891
 892         adapter->tx_ring.desc = NULL;
 893 }
 894
 895 static inline void
 896 ixgb_unmap_and_free_tx_resource(struct ixgb_adapter *adapter,
 897                                         struct ixgb_buffer *buffer_info)
 898 {
 899         struct pci_dev *pdev = adapter->pdev;
 900         if(buffer_info->dma) {
 901                 pci_unmap_page(pdev,
 902                            buffer_info->dma,
 903                            buffer_info->length,
 904                            PCI_DMA_TODEVICE);
 905                 buffer_info->dma = 0;
 906         }
 907         if(buffer_info->skb) {
 908                 dev_kfree_skb_any(buffer_info->skb);
 909                 buffer_info->skb = NULL;
 910         }
 911 }
 912
 913 /**
 914  * ixgb_clean_tx_ring - Free Tx Buffers
 915  * @adapter: board private structure
 916  **/
 917
 918 static void
 919 ixgb_clean_tx_ring(struct ixgb_adapter *adapter)
 920 {
 921         struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
 922         struct ixgb_buffer *buffer_info;
 923         unsigned long size;
 924         unsigned int i;
 925
 926         /* Free all the Tx ring sk_buffs */
 927
 928         for(i = 0; i < tx_ring->count; i++) {
 929                 buffer_info = &tx_ring->buffer_info[i];
 930                 ixgb_unmap_and_free_tx_resource(adapter, buffer_info);
 931         }
 932
 933         size = sizeof(struct ixgb_buffer) * tx_ring->count;
 934         memset(tx_ring->buffer_info, 0, size);
 935
 936         /* Zero out the descriptor ring */
 937
 938         memset(tx_ring->desc, 0, tx_ring->size);
 939
 940         tx_ring->next_to_use = 0;
 941         tx_ring->next_to_clean = 0;
 942
 943         IXGB_WRITE_REG(&adapter->hw, TDH, 0);
 944         IXGB_WRITE_REG(&adapter->hw, TDT, 0);
 945 }
 946
 947 /**
 948  * ixgb_free_rx_resources - Free Rx Resources
 949  * @adapter: board private structure
 950  *
 951  * Free all receive software resources
 952  **/
 953
 954 void
 955 ixgb_free_rx_resources(struct ixgb_adapter *adapter)
 956 {
 957         struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
 958         struct pci_dev *pdev = adapter->pdev;
 959
 960         ixgb_clean_rx_ring(adapter);
 961
 962         vfree(rx_ring->buffer_info);
 963         rx_ring->buffer_info = NULL;
 964
 965         pci_free_consistent(pdev, rx_ring->size, rx_ring->desc, rx_ring->dma);
 966
 967         rx_ring->desc = NULL;
 968 }
 969
 970 /**
 971  * ixgb_clean_rx_ring - Free Rx Buffers
 972  * @adapter: board private structure
 973  **/
 974
 975 static void
 976 ixgb_clean_rx_ring(struct ixgb_adapter *adapter)
 977 {
 978         struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
 979         struct ixgb_buffer *buffer_info;
 980         struct pci_dev *pdev = adapter->pdev;
 981         unsigned long size;
 982         unsigned int i;
 983
 984         /* Free all the Rx ring sk_buffs */
 985
 986         for(i = 0; i < rx_ring->count; i++) {
 987                 buffer_info = &rx_ring->buffer_info[i];
 988                 if(buffer_info->skb) {
 989
 990                         pci_unmap_single(pdev,
 991                                          buffer_info->dma,
 992                                          buffer_info->length,
 993                                          PCI_DMA_FROMDEVICE);
 994
 995                         dev_kfree_skb(buffer_info->skb);
 996
 997                         buffer_info->skb = NULL;
 998                 }
 999         }
1000
1001         size = sizeof(struct ixgb_buffer) * rx_ring->count;
1002         memset(rx_ring->buffer_info, 0, size);
1003
1004         /* Zero out the descriptor ring */
1005
1006         memset(rx_ring->desc, 0, rx_ring->size);
1007
1008         rx_ring->next_to_clean = 0;
1009         rx_ring->next_to_use = 0;
1010
1011         IXGB_WRITE_REG(&adapter->hw, RDH, 0);
1012         IXGB_WRITE_REG(&adapter->hw, RDT, 0);
1013 }
1014
1015 /**
1016  * ixgb_set_mac - Change the Ethernet Address of the NIC
1017  * @netdev: network interface device structure
1018  * @p: pointer to an address structure
1019  *
1020  * Returns 0 on success, negative on failure
1021  **/
1022
1023 static int
1024 ixgb_set_mac(struct net_device *netdev, void *p)
1025 {
1026         struct ixgb_adapter *adapter = netdev_priv(netdev);
1027         struct sockaddr *addr = p;
1028
1029         if(!is_valid_ether_addr(addr->sa_data))
1030                 return -EADDRNOTAVAIL;
1031
1032         memcpy(netdev->dev_addr, addr->sa_data, netdev->addr_len);
1033
1034         ixgb_rar_set(&adapter->hw, addr->sa_data, 0);
1035
1036         return 0;
1037 }
1038
1039 /**
1040  * ixgb_set_multi - Multicast and Promiscuous mode set
1041  * @netdev: network interface device structure
1042  *
1043  * The set_multi entry point is called whenever the multicast address
1044  * list or the network interface flags are updated.  This routine is
1045  * responsible for configuring the hardware for proper multicast,
1046  * promiscuous mode, and all-multi behavior.
1047  **/
1048
1049 static void
1050 ixgb_set_multi(struct net_device *netdev)
1051 {
1052         struct ixgb_adapter *adapter = netdev_priv(netdev);
1053         struct ixgb_hw *hw = &adapter->hw;
1054         struct dev_mc_list *mc_ptr;
1055         uint32_t rctl;
1056         int i;
1057
1058         /* Check for Promiscuous and All Multicast modes */
1059
1060         rctl = IXGB_READ_REG(hw, RCTL);
1061
1062         if(netdev->flags & IFF_PROMISC) {
1063                 rctl |= (IXGB_RCTL_UPE | IXGB_RCTL_MPE);
1064         } else if(netdev->flags & IFF_ALLMULTI) {
1065                 rctl |= IXGB_RCTL_MPE;
1066                 rctl &= ~IXGB_RCTL_UPE;
1067         } else {
1068                 rctl &= ~(IXGB_RCTL_UPE | IXGB_RCTL_MPE);
1069         }
1070
1071         if(netdev->mc_count > IXGB_MAX_NUM_MULTICAST_ADDRESSES) {
1072                 rctl |= IXGB_RCTL_MPE;
1073                 IXGB_WRITE_REG(hw, RCTL, rctl);
1074         } else {
1075                 uint8_t mta[netdev->mc_count * IXGB_ETH_LENGTH_OF_ADDRESS];
1076
1077                 IXGB_WRITE_REG(hw, RCTL, rctl);
1078
1079                 for(i = 0, mc_ptr = netdev->mc_list; mc_ptr;
1080                         i++, mc_ptr = mc_ptr->next)
1081                         memcpy(&mta[i * IXGB_ETH_LENGTH_OF_ADDRESS],
1082                                    mc_ptr->dmi_addr, IXGB_ETH_LENGTH_OF_ADDRESS);
1083
1084                 ixgb_mc_addr_list_update(hw, mta, netdev->mc_count, 0);
1085         }
1086 }
1087
1088 /**
1089  * ixgb_watchdog - Timer Call-back
1090  * @data: pointer to netdev cast into an unsigned long
1091  **/
1092
1093 static void
1094 ixgb_watchdog(unsigned long data)
1095 {
1096         struct ixgb_adapter *adapter = (struct ixgb_adapter *)data;
1097         struct net_device *netdev = adapter->netdev;
1098         struct ixgb_desc_ring *txdr = &adapter->tx_ring;
1099
1100         ixgb_check_for_link(&adapter->hw);
1101
1102         if (ixgb_check_for_bad_link(&adapter->hw)) {
1103                 /* force the reset path */
1104                 netif_stop_queue(netdev);
1105         }
1106
1107         if(adapter->hw.link_up) {
1108                 if(!netif_carrier_ok(netdev)) {
1109                         printk(KERN_INFO "ixgb: %s NIC Link is Up %d Mbps %s\n",
1110                                    netdev->name, 10000, "Full Duplex");
1111                         adapter->link_speed = 10000;
1112                         adapter->link_duplex = FULL_DUPLEX;
1113                         netif_carrier_on(netdev);
1114                         netif_wake_queue(netdev);
1115                 }
1116         } else {
1117                 if(netif_carrier_ok(netdev)) {
1118                         adapter->link_speed = 0;
1119                         adapter->link_duplex = 0;
1120                         printk(KERN_INFO
1121                                    "ixgb: %s NIC Link is Down\n",
1122                                    netdev->name);
1123                         netif_carrier_off(netdev);
1124                         netif_stop_queue(netdev);
1125
1126                 }
1127         }
1128
1129         ixgb_update_stats(adapter);
1130
1131         if(!netif_carrier_ok(netdev)) {
1132                 if(IXGB_DESC_UNUSED(txdr) + 1 < txdr->count) {
1133                         /* We've lost link, so the controller stops DMA,
1134                          * but we've got queued Tx work that's never going
1135                          * to get done, so reset controller to flush Tx.
1136                          * (Do the reset outside of interrupt context). */
1137                         schedule_work(&adapter->tx_timeout_task);
1138                 }
1139         }
1140
1141         /* Force detection of hung controller every watchdog period */
1142         adapter->detect_tx_hung = TRUE;
1143
1144         /* generate an interrupt to force clean up of any stragglers */
1145         IXGB_WRITE_REG(&adapter->hw, ICS, IXGB_INT_TXDW);
1146
1147         /* Reset the timer */
1148         mod_timer(&adapter->watchdog_timer, jiffies + 2 * HZ);
1149 }
1150
1151 #define IXGB_TX_FLAGS_CSUM              0x00000001
1152 #define IXGB_TX_FLAGS_VLAN              0x00000002
1153 #define IXGB_TX_FLAGS_TSO               0x00000004
1154
1155 static inline int
1156 ixgb_tso(struct ixgb_adapter *adapter, struct sk_buff *skb)
1157 {
1158 #ifdef NETIF_F_TSO
1159         struct ixgb_context_desc *context_desc;
1160         unsigned int i;
1161         uint8_t ipcss, ipcso, tucss, tucso, hdr_len;
1162         uint16_t ipcse, tucse, mss;
1163         int err;
1164
1165         if(likely(skb_shinfo(skb)->tso_size)) {
1166                 if (skb_header_cloned(skb)) {
1167                         err = pskb_expand_head(skb, 0, 0, GFP_ATOMIC);
1168                         if (err)
1169                                 return err;
1170                 }
1171
1172                 hdr_len = ((skb->h.raw - skb->data) + (skb->h.th->doff << 2));
1173                 mss = skb_shinfo(skb)->tso_size;
1174                 skb->nh.iph->tot_len = 0;
1175                 skb->nh.iph->check = 0;
1176                 skb->h.th->check = ~csum_tcpudp_magic(skb->nh.iph->saddr,
1177                                                       skb->nh.iph->daddr,
1178                                                       0, IPPROTO_TCP, 0);
1179                 ipcss = skb->nh.raw - skb->data;
1180                 ipcso = (void *)&(skb->nh.iph->check) - (void *)skb->data;
1181                 ipcse = skb->h.raw - skb->data - 1;
1182                 tucss = skb->h.raw - skb->data;
1183                 tucso = (void *)&(skb->h.th->check) - (void *)skb->data;
1184                 tucse = 0;
1185
1186                 i = adapter->tx_ring.next_to_use;
1187                 context_desc = IXGB_CONTEXT_DESC(adapter->tx_ring, i);
1188
1189                 context_desc->ipcss = ipcss;
1190                 context_desc->ipcso = ipcso;
1191                 context_desc->ipcse = cpu_to_le16(ipcse);
1192                 context_desc->tucss = tucss;
1193                 context_desc->tucso = tucso;
1194                 context_desc->tucse = cpu_to_le16(tucse);
1195                 context_desc->mss = cpu_to_le16(mss);
1196                 context_desc->hdr_len = hdr_len;
1197                 context_desc->status = 0;
1198                 context_desc->cmd_type_len = cpu_to_le32(
1199                                                   IXGB_CONTEXT_DESC_TYPE
1200                                                 | IXGB_CONTEXT_DESC_CMD_TSE
1201                                                 | IXGB_CONTEXT_DESC_CMD_IP
1202                                                 | IXGB_CONTEXT_DESC_CMD_TCP
1203                                                 | IXGB_CONTEXT_DESC_CMD_IDE
1204                                                 | (skb->len - (hdr_len)));
1205
1206
1207                 if(++i == adapter->tx_ring.count) i = 0;
1208                 adapter->tx_ring.next_to_use = i;
1209
1210                 return 1;
1211         }
1212 #endif
1213
1214         return 0;
1215 }
1216
1217 static inline boolean_t
1218 ixgb_tx_csum(struct ixgb_adapter *adapter, struct sk_buff *skb)
1219 {
1220         struct ixgb_context_desc *context_desc;
1221         unsigned int i;
1222         uint8_t css, cso;
1223
1224         if(likely(skb->ip_summed == CHECKSUM_HW)) {
1225                 css = skb->h.raw - skb->data;
1226                 cso = (skb->h.raw + skb->csum) - skb->data;
1227
1228                 i = adapter->tx_ring.next_to_use;
1229                 context_desc = IXGB_CONTEXT_DESC(adapter->tx_ring, i);
1230
1231                 context_desc->tucss = css;
1232                 context_desc->tucso = cso;
1233                 context_desc->tucse = 0;
1234                 /* zero out any previously existing data in one instruction */
1235                 *(uint32_t *)&(context_desc->ipcss) = 0;
1236                 context_desc->status = 0;
1237                 context_desc->hdr_len = 0;
1238                 context_desc->mss = 0;
1239                 context_desc->cmd_type_len =
1240                         cpu_to_le32(IXGB_CONTEXT_DESC_TYPE
1241                                     | IXGB_TX_DESC_CMD_IDE);
1242
1243                 if(++i == adapter->tx_ring.count) i = 0;
1244                 adapter->tx_ring.next_to_use = i;
1245
1246                 return TRUE;
1247         }
1248
1249         return FALSE;
1250 }
1251
1252 #define IXGB_MAX_TXD_PWR        14
1253 #define IXGB_MAX_DATA_PER_TXD   (1<<IXGB_MAX_TXD_PWR)
1254
1255 static inline int
1256 ixgb_tx_map(struct ixgb_adapter *adapter, struct sk_buff *skb,
1257             unsigned int first)
1258 {
1259         struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
1260         struct ixgb_buffer *buffer_info;
1261         int len = skb->len;
1262         unsigned int offset = 0, size, count = 0, i;
1263
1264         unsigned int nr_frags = skb_shinfo(skb)->nr_frags;
1265         unsigned int f;
1266
1267         len -= skb->data_len;
1268
1269         i = tx_ring->next_to_use;
1270
1271         while(len) {
1272                 buffer_info = &tx_ring->buffer_info[i];
1273                 size = min(len, IXGB_MAX_JUMBO_FRAME_SIZE);
1274                 buffer_info->length = size;
1275                 buffer_info->dma =
1276                         pci_map_single(adapter->pdev,
1277                                 skb->data + offset,
1278                                 size,
1279                                 PCI_DMA_TODEVICE);
1280                 buffer_info->time_stamp = jiffies;
1281
1282                 len -= size;
1283                 offset += size;
1284                 count++;
1285                 if(++i == tx_ring->count) i = 0;
1286         }
1287
1288         for(f = 0; f < nr_frags; f++) {
1289                 struct skb_frag_struct *frag;
1290
1291                 frag = &skb_shinfo(skb)->frags[f];
1292                 len = frag->size;
1293                 offset = 0;
1294
1295                 while(len) {
1296                         buffer_info = &tx_ring->buffer_info[i];
1297                         size = min(len, IXGB_MAX_JUMBO_FRAME_SIZE);
1298                         buffer_info->length = size;
1299                         buffer_info->dma =
1300                                 pci_map_page(adapter->pdev,
1301                                         frag->page,
1302                                         frag->page_offset + offset,
1303                                         size,
1304                                         PCI_DMA_TODEVICE);
1305                         buffer_info->time_stamp = jiffies;
1306
1307                         len -= size;
1308                         offset += size;
1309                         count++;
1310                         if(++i == tx_ring->count) i = 0;
1311                 }
1312         }
1313         i = (i == 0) ? tx_ring->count - 1 : i - 1;
1314         tx_ring->buffer_info[i].skb = skb;
1315         tx_ring->buffer_info[first].next_to_watch = i;
1316
1317         return count;
1318 }
1319
1320 static inline void
1321 ixgb_tx_queue(struct ixgb_adapter *adapter, int count, int vlan_id,int tx_flags)
1322 {
1323         struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
1324         struct ixgb_tx_desc *tx_desc = NULL;
1325         struct ixgb_buffer *buffer_info;
1326         uint32_t cmd_type_len = adapter->tx_cmd_type;
1327         uint8_t status = 0;
1328         uint8_t popts = 0;
1329         unsigned int i;
1330
1331         if(tx_flags & IXGB_TX_FLAGS_TSO) {
1332                 cmd_type_len |= IXGB_TX_DESC_CMD_TSE;
1333                 popts |= (IXGB_TX_DESC_POPTS_IXSM | IXGB_TX_DESC_POPTS_TXSM);
1334         }
1335
1336         if(tx_flags & IXGB_TX_FLAGS_CSUM)
1337                 popts |= IXGB_TX_DESC_POPTS_TXSM;
1338
1339         if(tx_flags & IXGB_TX_FLAGS_VLAN) {
1340                 cmd_type_len |= IXGB_TX_DESC_CMD_VLE;
1341         }
1342
1343         i = tx_ring->next_to_use;
1344
1345         while(count--) {
1346                 buffer_info = &tx_ring->buffer_info[i];
1347                 tx_desc = IXGB_TX_DESC(*tx_ring, i);
1348                 tx_desc->buff_addr = cpu_to_le64(buffer_info->dma);
1349                 tx_desc->cmd_type_len =
1350                         cpu_to_le32(cmd_type_len | buffer_info->length);
1351                 tx_desc->status = status;
1352                 tx_desc->popts = popts;
1353                 tx_desc->vlan = cpu_to_le16(vlan_id);
1354
1355                 if(++i == tx_ring->count) i = 0;
1356         }
1357
1358         tx_desc->cmd_type_len |= cpu_to_le32(IXGB_TX_DESC_CMD_EOP
1359                                 | IXGB_TX_DESC_CMD_RS );
1360
1361         /* Force memory writes to complete before letting h/w
1362          * know there are new descriptors to fetch.  (Only
1363          * applicable for weak-ordered memory model archs,
1364          * such as IA-64). */
1365         wmb();
1366
1367         tx_ring->next_to_use = i;
1368         IXGB_WRITE_REG(&adapter->hw, TDT, i);
1369 }
1370
1371 /* Tx Descriptors needed, worst case */
1372 #define TXD_USE_COUNT(S) (((S) >> IXGB_MAX_TXD_PWR) + \
1373                          (((S) & (IXGB_MAX_DATA_PER_TXD - 1)) ? 1 : 0))
1374 #define DESC_NEEDED TXD_USE_COUNT(IXGB_MAX_DATA_PER_TXD) + \
1375         MAX_SKB_FRAGS * TXD_USE_COUNT(PAGE_SIZE) + 1
1376
1377 static int
1378 ixgb_xmit_frame(struct sk_buff *skb, struct net_device *netdev)
1379 {
1380         struct ixgb_adapter *adapter = netdev_priv(netdev);
1381         unsigned int first;
1382         unsigned int tx_flags = 0;
1383         unsigned long flags;
1384         int vlan_id = 0;
1385         int tso;
1386
1387         if(skb->len <= 0) {
1388                 dev_kfree_skb_any(skb);
1389                 return 0;
1390         }
1391
1392         spin_lock_irqsave(&adapter->tx_lock, flags);
1393         if(unlikely(IXGB_DESC_UNUSED(&adapter->tx_ring) < DESC_NEEDED)) {
1394                 netif_stop_queue(netdev);
1395                 spin_unlock_irqrestore(&adapter->tx_lock, flags);
1396                 return 1;
1397         }
1398         spin_unlock_irqrestore(&adapter->tx_lock, flags);
1399
1400         if(adapter->vlgrp && vlan_tx_tag_present(skb)) {
1401                 tx_flags |= IXGB_TX_FLAGS_VLAN;
1402                 vlan_id = vlan_tx_tag_get(skb);
1403         }
1404
1405         first = adapter->tx_ring.next_to_use;
1406
1407         tso = ixgb_tso(adapter, skb);
1408         if (tso < 0) {
1409                 dev_kfree_skb_any(skb);
1410                 return NETDEV_TX_OK;
1411         }
1412
1413         if (tso)
1414                 tx_flags |= IXGB_TX_FLAGS_TSO;
1415         else if(ixgb_tx_csum(adapter, skb))
1416                 tx_flags |= IXGB_TX_FLAGS_CSUM;
1417
1418         ixgb_tx_queue(adapter, ixgb_tx_map(adapter, skb, first), vlan_id,
1419                         tx_flags);
1420
1421         netdev->trans_start = jiffies;
1422
1423         return 0;
1424 }
1425
1426 /**
1427  * ixgb_tx_timeout - Respond to a Tx Hang
1428  * @netdev: network interface device structure
1429  **/
1430
1431 static void
1432 ixgb_tx_timeout(struct net_device *netdev)
1433 {
1434         struct ixgb_adapter *adapter = netdev_priv(netdev);
1435
1436         /* Do the reset outside of interrupt context */
1437         schedule_work(&adapter->tx_timeout_task);
1438 }
1439
1440 static void
1441 ixgb_tx_timeout_task(struct net_device *netdev)
1442 {
1443         struct ixgb_adapter *adapter = netdev_priv(netdev);
1444
1445         ixgb_down(adapter, TRUE);
1446         ixgb_up(adapter);
1447 }
1448
1449 /**
1450  * ixgb_get_stats - Get System Network Statistics
1451  * @netdev: network interface device structure
1452  *
1453  * Returns the address of the device statistics structure.
1454  * The statistics are actually updated from the timer callback.
1455  **/
1456
1457 static struct net_device_stats *
1458 ixgb_get_stats(struct net_device *netdev)
1459 {
1460         struct ixgb_adapter *adapter = netdev_priv(netdev);
1461
1462         return &adapter->net_stats;
1463 }
1464
1465 /**
1466  * ixgb_change_mtu - Change the Maximum Transfer Unit
1467  * @netdev: network interface device structure
1468  * @new_mtu: new value for maximum frame size
1469  *
1470  * Returns 0 on success, negative on failure
1471  **/
1472
1473 static int
1474 ixgb_change_mtu(struct net_device *netdev, int new_mtu)
1475 {
1476         struct ixgb_adapter *adapter = netdev_priv(netdev);
1477         int max_frame = new_mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;
1478         int old_max_frame = netdev->mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;
1479
1480
1481         if((max_frame < IXGB_MIN_ENET_FRAME_SIZE_WITHOUT_FCS + ENET_FCS_LENGTH)
1482            || (max_frame > IXGB_MAX_JUMBO_FRAME_SIZE + ENET_FCS_LENGTH)) {
1483                 IXGB_ERR("Invalid MTU setting\n");
1484                 return -EINVAL;
1485         }
1486
1487         if((max_frame <= IXGB_MAX_ENET_FRAME_SIZE_WITHOUT_FCS + ENET_FCS_LENGTH)
1488            || (max_frame <= IXGB_RXBUFFER_2048)) {
1489                 adapter->rx_buffer_len = IXGB_RXBUFFER_2048;
1490
1491         } else if(max_frame <= IXGB_RXBUFFER_4096) {
1492                 adapter->rx_buffer_len = IXGB_RXBUFFER_4096;
1493
1494         } else if(max_frame <= IXGB_RXBUFFER_8192) {
1495                 adapter->rx_buffer_len = IXGB_RXBUFFER_8192;
1496
1497         } else {
1498                 adapter->rx_buffer_len = IXGB_RXBUFFER_16384;
1499         }
1500
1501         netdev->mtu = new_mtu;
1502
1503         if(old_max_frame != max_frame && netif_running(netdev)) {
1504
1505                 ixgb_down(adapter, TRUE);
1506                 ixgb_up(adapter);
1507         }
1508
1509         return 0;
1510 }
1511
1512 /**
1513  * ixgb_update_stats - Update the board statistics counters.
1514  * @adapter: board private structure
1515  **/
1516
1517 void
1518 ixgb_update_stats(struct ixgb_adapter *adapter)
1519 {
1520         struct net_device *netdev = adapter->netdev;
1521
1522         if((netdev->flags & IFF_PROMISC) || (netdev->flags & IFF_ALLMULTI) ||
1523            (netdev->mc_count > IXGB_MAX_NUM_MULTICAST_ADDRESSES)) {
1524                 u64 multi = IXGB_READ_REG(&adapter->hw, MPRCL);
1525                 u32 bcast_l = IXGB_READ_REG(&adapter->hw, BPRCL);
1526                 u32 bcast_h = IXGB_READ_REG(&adapter->hw, BPRCH);
1527                 u64 bcast = ((u64)bcast_h << 32) | bcast_l;
1528
1529                 multi |= ((u64)IXGB_READ_REG(&adapter->hw, MPRCH) << 32);
1530                 /* fix up multicast stats by removing broadcasts */
1531                 if(multi >= bcast)
1532                         multi -= bcast;
1533
1534                 adapter->stats.mprcl += (multi & 0xFFFFFFFF);
1535                 adapter->stats.mprch += (multi >> 32);
1536                 adapter->stats.bprcl += bcast_l;
1537                 adapter->stats.bprch += bcast_h;
1538         } else {
1539                 adapter->stats.mprcl += IXGB_READ_REG(&adapter->hw, MPRCL);
1540                 adapter->stats.mprch += IXGB_READ_REG(&adapter->hw, MPRCH);
1541                 adapter->stats.bprcl += IXGB_READ_REG(&adapter->hw, BPRCL);
1542                 adapter->stats.bprch += IXGB_READ_REG(&adapter->hw, BPRCH);
1543         }
1544         adapter->stats.tprl += IXGB_READ_REG(&adapter->hw, TPRL);
1545         adapter->stats.tprh += IXGB_READ_REG(&adapter->hw, TPRH);
1546         adapter->stats.gprcl += IXGB_READ_REG(&adapter->hw, GPRCL);
1547         adapter->stats.gprch += IXGB_READ_REG(&adapter->hw, GPRCH);
1548         adapter->stats.uprcl += IXGB_READ_REG(&adapter->hw, UPRCL);
1549         adapter->stats.uprch += IXGB_READ_REG(&adapter->hw, UPRCH);
1550         adapter->stats.vprcl += IXGB_READ_REG(&adapter->hw, VPRCL);
1551         adapter->stats.vprch += IXGB_READ_REG(&adapter->hw, VPRCH);
1552         adapter->stats.jprcl += IXGB_READ_REG(&adapter->hw, JPRCL);
1553         adapter->stats.jprch += IXGB_READ_REG(&adapter->hw, JPRCH);
1554         adapter->stats.gorcl += IXGB_READ_REG(&adapter->hw, GORCL);
1555         adapter->stats.gorch += IXGB_READ_REG(&adapter->hw, GORCH);
1556         adapter->stats.torl += IXGB_READ_REG(&adapter->hw, TORL);
1557         adapter->stats.torh += IXGB_READ_REG(&adapter->hw, TORH);
1558         adapter->stats.rnbc += IXGB_READ_REG(&adapter->hw, RNBC);
1559         adapter->stats.ruc += IXGB_READ_REG(&adapter->hw, RUC);
1560         adapter->stats.roc += IXGB_READ_REG(&adapter->hw, ROC);
1561         adapter->stats.rlec += IXGB_READ_REG(&adapter->hw, RLEC);
1562         adapter->stats.crcerrs += IXGB_READ_REG(&adapter->hw, CRCERRS);
1563         adapter->stats.icbc += IXGB_READ_REG(&adapter->hw, ICBC);
1564         adapter->stats.ecbc += IXGB_READ_REG(&adapter->hw, ECBC);
1565         adapter->stats.mpc += IXGB_READ_REG(&adapter->hw, MPC);
1566         adapter->stats.tptl += IXGB_READ_REG(&adapter->hw, TPTL);
1567         adapter->stats.tpth += IXGB_READ_REG(&adapter->hw, TPTH);
1568         adapter->stats.gptcl += IXGB_READ_REG(&adapter->hw, GPTCL);
1569         adapter->stats.gptch += IXGB_READ_REG(&adapter->hw, GPTCH);
1570         adapter->stats.bptcl += IXGB_READ_REG(&adapter->hw, BPTCL);
1571         adapter->stats.bptch += IXGB_READ_REG(&adapter->hw, BPTCH);
1572         adapter->stats.mptcl += IXGB_READ_REG(&adapter->hw, MPTCL);
1573         adapter->stats.mptch += IXGB_READ_REG(&adapter->hw, MPTCH);
1574         adapter->stats.uptcl += IXGB_READ_REG(&adapter->hw, UPTCL);
1575         adapter->stats.uptch += IXGB_READ_REG(&adapter->hw, UPTCH);
1576         adapter->stats.vptcl += IXGB_READ_REG(&adapter->hw, VPTCL);
1577         adapter->stats.vptch += IXGB_READ_REG(&adapter->hw, VPTCH);
1578         adapter->stats.jptcl += IXGB_READ_REG(&adapter->hw, JPTCL);
1579         adapter->stats.jptch += IXGB_READ_REG(&adapter->hw, JPTCH);
1580         adapter->stats.gotcl += IXGB_READ_REG(&adapter->hw, GOTCL);
1581         adapter->stats.gotch += IXGB_READ_REG(&adapter->hw, GOTCH);
1582         adapter->stats.totl += IXGB_READ_REG(&adapter->hw, TOTL);
1583         adapter->stats.toth += IXGB_READ_REG(&adapter->hw, TOTH);
1584         adapter->stats.dc += IXGB_READ_REG(&adapter->hw, DC);
1585         adapter->stats.plt64c += IXGB_READ_REG(&adapter->hw, PLT64C);
1586         adapter->stats.tsctc += IXGB_READ_REG(&adapter->hw, TSCTC);
1587         adapter->stats.tsctfc += IXGB_READ_REG(&adapter->hw, TSCTFC);
1588         adapter->stats.ibic += IXGB_READ_REG(&adapter->hw, IBIC);
1589         adapter->stats.rfc += IXGB_READ_REG(&adapter->hw, RFC);
1590         adapter->stats.lfc += IXGB_READ_REG(&adapter->hw, LFC);
1591         adapter->stats.pfrc += IXGB_READ_REG(&adapter->hw, PFRC);
1592         adapter->stats.pftc += IXGB_READ_REG(&adapter->hw, PFTC);
1593         adapter->stats.mcfrc += IXGB_READ_REG(&adapter->hw, MCFRC);
1594         adapter->stats.mcftc += IXGB_READ_REG(&adapter->hw, MCFTC);
1595         adapter->stats.xonrxc += IXGB_READ_REG(&adapter->hw, XONRXC);
1596         adapter->stats.xontxc += IXGB_READ_REG(&adapter->hw, XONTXC);
1597         adapter->stats.xoffrxc += IXGB_READ_REG(&adapter->hw, XOFFRXC);
1598         adapter->stats.xofftxc += IXGB_READ_REG(&adapter->hw, XOFFTXC);
1599         adapter->stats.rjc += IXGB_READ_REG(&adapter->hw, RJC);
1600
1601         /* Fill out the OS statistics structure */
1602
1603         adapter->net_stats.rx_packets = adapter->stats.gprcl;
1604         adapter->net_stats.tx_packets = adapter->stats.gptcl;
1605         adapter->net_stats.rx_bytes = adapter->stats.gorcl;
1606         adapter->net_stats.tx_bytes = adapter->stats.gotcl;
1607         adapter->net_stats.multicast = adapter->stats.mprcl;
1608         adapter->net_stats.collisions = 0;
1609
1610         /* ignore RLEC as it reports errors for padded (<64bytes) frames
1611          * with a length in the type/len field */
1612         adapter->net_stats.rx_errors =
1613             /* adapter->stats.rnbc + */ adapter->stats.crcerrs +
1614             adapter->stats.ruc +
1615             adapter->stats.roc /*+ adapter->stats.rlec */  +
1616             adapter->stats.icbc +
1617             adapter->stats.ecbc + adapter->stats.mpc;
1618
1619         adapter->net_stats.rx_dropped = adapter->stats.mpc;
1620
1621         /* see above
1622          * adapter->net_stats.rx_length_errors = adapter->stats.rlec;
1623          */
1624
1625         adapter->net_stats.rx_crc_errors = adapter->stats.crcerrs;
1626         adapter->net_stats.rx_fifo_errors = adapter->stats.mpc;
1627         adapter->net_stats.rx_missed_errors = adapter->stats.mpc;
1628         adapter->net_stats.rx_over_errors = adapter->stats.mpc;
1629
1630         adapter->net_stats.tx_errors = 0;
1631         adapter->net_stats.rx_frame_errors = 0;
1632         adapter->net_stats.tx_aborted_errors = 0;
1633         adapter->net_stats.tx_carrier_errors = 0;
1634         adapter->net_stats.tx_fifo_errors = 0;
1635         adapter->net_stats.tx_heartbeat_errors = 0;
1636         adapter->net_stats.tx_window_errors = 0;
1637 }
1638
1639 #define IXGB_MAX_INTR 10
1640 /**
1641  * ixgb_intr - Interrupt Handler
1642  * @irq: interrupt number
1643  * @data: pointer to a network interface device structure
1644  * @pt_regs: CPU registers structure
1645  **/
1646
1647 static irqreturn_t
1648 ixgb_intr(int irq, void *data, struct pt_regs *regs)
1649 {
1650         struct net_device *netdev = data;
1651         struct ixgb_adapter *adapter = netdev_priv(netdev);
1652         struct ixgb_hw *hw = &adapter->hw;
1653         uint32_t icr = IXGB_READ_REG(hw, ICR);
1654 #ifndef CONFIG_IXGB_NAPI
1655         unsigned int i;
1656 #endif
1657
1658         if(unlikely(!icr))
1659                 return IRQ_NONE;  /* Not our interrupt */
1660
1661         if(unlikely(icr & (IXGB_INT_RXSEQ | IXGB_INT_LSC))) {
1662                 mod_timer(&adapter->watchdog_timer, jiffies);
1663         }
1664
1665 #ifdef CONFIG_IXGB_NAPI
1666         if(netif_rx_schedule_prep(netdev)) {
1667
1668                 /* Disable interrupts and register for poll. The flush
1669                   of the posted write is intentionally left out.
1670                 */
1671
1672                 atomic_inc(&adapter->irq_sem);
1673                 IXGB_WRITE_REG(&adapter->hw, IMC, ~0);
1674                 __netif_rx_schedule(netdev);
1675         }
1676 #else
1677         /* yes, that is actually a & and it is meant to make sure that
1678          * every pass through this for loop checks both receive and
1679          * transmit queues for completed descriptors, intended to
1680          * avoid starvation issues and assist tx/rx fairness. */
1681         for(i = 0; i < IXGB_MAX_INTR; i++)
1682                 if(!ixgb_clean_rx_irq(adapter) &
1683                    !ixgb_clean_tx_irq(adapter))
1684                         break;
1685 #endif
1686         return IRQ_HANDLED;
1687 }
1688
1689 #ifdef CONFIG_IXGB_NAPI
1690 /**
1691  * ixgb_clean - NAPI Rx polling callback
1692  * @adapter: board private structure
1693  **/
1694
1695 static int
1696 ixgb_clean(struct net_device *netdev, int *budget)
1697 {
1698         struct ixgb_adapter *adapter = netdev_priv(netdev);
1699         int work_to_do = min(*budget, netdev->quota);
1700         int tx_cleaned;
1701         int work_done = 0;
1702
1703         tx_cleaned = ixgb_clean_tx_irq(adapter);
1704         ixgb_clean_rx_irq(adapter, &work_done, work_to_do);
1705
1706         *budget -= work_done;
1707         netdev->quota -= work_done;
1708
1709         /* if no Tx and not enough Rx work done, exit the polling mode */
1710         if((!tx_cleaned && (work_done == 0)) || !netif_running(netdev)) {
1711                 netif_rx_complete(netdev);
1712                 ixgb_irq_enable(adapter);
1713                 return 0;
1714         }
1715
1716         return 1;
1717 }
1718 #endif
1719
1720 /**
1721  * ixgb_clean_tx_irq - Reclaim resources after transmit completes
1722  * @adapter: board private structure
1723  **/
1724
1725 static boolean_t
1726 ixgb_clean_tx_irq(struct ixgb_adapter *adapter)
1727 {
1728         struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
1729         struct net_device *netdev = adapter->netdev;
1730         struct ixgb_tx_desc *tx_desc, *eop_desc;
1731         struct ixgb_buffer *buffer_info;
1732         unsigned int i, eop;
1733         boolean_t cleaned = FALSE;
1734
1735         i = tx_ring->next_to_clean;
1736         eop = tx_ring->buffer_info[i].next_to_watch;
1737         eop_desc = IXGB_TX_DESC(*tx_ring, eop);
1738
1739         while(eop_desc->status & IXGB_TX_DESC_STATUS_DD) {
1740
1741                 for(cleaned = FALSE; !cleaned; ) {
1742                         tx_desc = IXGB_TX_DESC(*tx_ring, i);
1743                         buffer_info = &tx_ring->buffer_info[i];
1744
1745                         if (tx_desc->popts
1746                             & (IXGB_TX_DESC_POPTS_TXSM |
1747                                IXGB_TX_DESC_POPTS_IXSM))
1748                                 adapter->hw_csum_tx_good++;
1749
1750                         ixgb_unmap_and_free_tx_resource(adapter, buffer_info);
1751
1752                         *(uint32_t *)&(tx_desc->status) = 0;
1753
1754                         cleaned = (i == eop);
1755                         if(++i == tx_ring->count) i = 0;
1756                 }
1757
1758                 eop = tx_ring->buffer_info[i].next_to_watch;
1759                 eop_desc = IXGB_TX_DESC(*tx_ring, eop);
1760         }
1761
1762         tx_ring->next_to_clean = i;
1763
1764         spin_lock(&adapter->tx_lock);
1765         if(cleaned && netif_queue_stopped(netdev) && netif_carrier_ok(netdev) &&
1766            (IXGB_DESC_UNUSED(tx_ring) > IXGB_TX_QUEUE_WAKE)) {
1767
1768                 netif_wake_queue(netdev);
1769         }
1770         spin_unlock(&adapter->tx_lock);
1771
1772         if(adapter->detect_tx_hung) {
1773                 /* detect a transmit hang in hardware, this serializes the
1774                  * check with the clearing of time_stamp and movement of i */
1775                 adapter->detect_tx_hung = FALSE;
1776                 if(tx_ring->buffer_info[i].dma &&
1777                    time_after(jiffies, tx_ring->buffer_info[i].time_stamp + HZ)
1778                    && !(IXGB_READ_REG(&adapter->hw, STATUS) &
1779                         IXGB_STATUS_TXOFF))
1780                         netif_stop_queue(netdev);
1781         }
1782
1783         return cleaned;
1784 }
1785
1786 /**
1787  * ixgb_rx_checksum - Receive Checksum Offload for 82597.
1788  * @adapter: board private structure
1789  * @rx_desc: receive descriptor
1790  * @sk_buff: socket buffer with received data
1791  **/
1792
1793 static inline void
1794 ixgb_rx_checksum(struct ixgb_adapter *adapter,
1795                  struct ixgb_rx_desc *rx_desc,
1796                  struct sk_buff *skb)
1797 {
1798         /* Ignore Checksum bit is set OR
1799          * TCP Checksum has not been calculated
1800          */
1801         if((rx_desc->status & IXGB_RX_DESC_STATUS_IXSM) ||
1802            (!(rx_desc->status & IXGB_RX_DESC_STATUS_TCPCS))) {
1803                 skb->ip_summed = CHECKSUM_NONE;
1804                 return;
1805         }
1806
1807         /* At this point we know the hardware did the TCP checksum */
1808         /* now look at the TCP checksum error bit */
1809         if(rx_desc->errors & IXGB_RX_DESC_ERRORS_TCPE) {
1810                 /* let the stack verify checksum errors */
1811                 skb->ip_summed = CHECKSUM_NONE;
1812                 adapter->hw_csum_rx_error++;
1813         } else {
1814                 /* TCP checksum is good */
1815                 skb->ip_summed = CHECKSUM_UNNECESSARY;
1816                 adapter->hw_csum_rx_good++;
1817         }
1818 }
1819
1820 /**
1821  * ixgb_clean_rx_irq - Send received data up the network stack,
1822  * @adapter: board private structure
1823  **/
1824
1825 static boolean_t
1826 #ifdef CONFIG_IXGB_NAPI
1827 ixgb_clean_rx_irq(struct ixgb_adapter *adapter, int *work_done, int work_to_do)
1828 #else
1829 ixgb_clean_rx_irq(struct ixgb_adapter *adapter)
1830 #endif
1831 {
1832         struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
1833         struct net_device *netdev = adapter->netdev;
1834         struct pci_dev *pdev = adapter->pdev;
1835         struct ixgb_rx_desc *rx_desc, *next_rxd;
1836         struct ixgb_buffer *buffer_info, *next_buffer, *next2_buffer;
1837         uint32_t length;
1838         unsigned int i, j;
1839         boolean_t cleaned = FALSE;
1840
1841         i = rx_ring->next_to_clean;
1842         rx_desc = IXGB_RX_DESC(*rx_ring, i);
1843         buffer_info = &rx_ring->buffer_info[i];
1844
1845         while(rx_desc->status & IXGB_RX_DESC_STATUS_DD) {
1846                 struct sk_buff *skb, *next_skb;
1847                 u8 status;
1848
1849 #ifdef CONFIG_IXGB_NAPI
1850                 if(*work_done >= work_to_do)
1851                         break;
1852
1853                 (*work_done)++;
1854 #endif
1855                 status = rx_desc->status;
1856                 skb = buffer_info->skb;
1857
1858                 prefetch(skb->data);
1859
1860                 if(++i == rx_ring->count) i = 0;
1861                 next_rxd = IXGB_RX_DESC(*rx_ring, i);
1862                 prefetch(next_rxd);
1863
1864                 if((j = i + 1) == rx_ring->count) j = 0;
1865                 next2_buffer = &rx_ring->buffer_info[j];
1866                 prefetch(next2_buffer);
1867
1868                 next_buffer = &rx_ring->buffer_info[i];
1869                 next_skb = next_buffer->skb;
1870                 prefetch(next_skb);
1871
1872                 cleaned = TRUE;
1873
1874                 pci_unmap_single(pdev,
1875                                  buffer_info->dma,
1876                                  buffer_info->length,
1877                                  PCI_DMA_FROMDEVICE);
1878
1879                 length = le16_to_cpu(rx_desc->length);
1880
1881                 if(unlikely(!(status & IXGB_RX_DESC_STATUS_EOP))) {
1882
1883                         /* All receives must fit into a single buffer */
1884
1885                         IXGB_DBG("Receive packet consumed multiple buffers "
1886                                          "length<%x>\n", length);
1887
1888                         dev_kfree_skb_irq(skb);
1889                         goto rxdesc_done;
1890                 }
1891
1892                 if (unlikely(rx_desc->errors
1893                              & (IXGB_RX_DESC_ERRORS_CE | IXGB_RX_DESC_ERRORS_SE
1894                                 | IXGB_RX_DESC_ERRORS_P |
1895                                 IXGB_RX_DESC_ERRORS_RXE))) {
1896
1897                         dev_kfree_skb_irq(skb);
1898                         goto rxdesc_done;
1899                 }
1900
1901                 /* Good Receive */
1902                 skb_put(skb, length);
1903
1904                 /* Receive Checksum Offload */
1905                 ixgb_rx_checksum(adapter, rx_desc, skb);
1906
1907                 skb->protocol = eth_type_trans(skb, netdev);
1908 #ifdef CONFIG_IXGB_NAPI
1909                 if(adapter->vlgrp && (status & IXGB_RX_DESC_STATUS_VP)) {
1910                         vlan_hwaccel_receive_skb(skb, adapter->vlgrp,
1911                                 le16_to_cpu(rx_desc->special) &
1912                                         IXGB_RX_DESC_SPECIAL_VLAN_MASK);
1913                 } else {
1914                         netif_receive_skb(skb);
1915                 }
1916 #else /* CONFIG_IXGB_NAPI */
1917                 if(adapter->vlgrp && (status & IXGB_RX_DESC_STATUS_VP)) {
1918                         vlan_hwaccel_rx(skb, adapter->vlgrp,
1919                                 le16_to_cpu(rx_desc->special) &
1920                                         IXGB_RX_DESC_SPECIAL_VLAN_MASK);
1921                 } else {
1922                         netif_rx(skb);
1923                 }
1924 #endif /* CONFIG_IXGB_NAPI */
1925                 netdev->last_rx = jiffies;
1926
1927 rxdesc_done:
1928                 /* clean up descriptor, might be written over by hw */
1929                 rx_desc->status = 0;
1930                 buffer_info->skb = NULL;
1931
1932                 /* use prefetched values */
1933                 rx_desc = next_rxd;
1934                 buffer_info = next_buffer;
1935         }
1936
1937         rx_ring->next_to_clean = i;
1938
1939         ixgb_alloc_rx_buffers(adapter);
1940
1941         return cleaned;
1942 }
1943
1944 /**
1945  * ixgb_alloc_rx_buffers - Replace used receive buffers
1946  * @adapter: address of board private structure
1947  **/
1948
1949 static void
1950 ixgb_alloc_rx_buffers(struct ixgb_adapter *adapter)
1951 {
1952         struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
1953         struct net_device *netdev = adapter->netdev;
1954         struct pci_dev *pdev = adapter->pdev;
1955         struct ixgb_rx_desc *rx_desc;
1956         struct ixgb_buffer *buffer_info;
1957         struct sk_buff *skb;
1958         unsigned int i;
1959         int num_group_tail_writes;
1960         long cleancount;
1961
1962         i = rx_ring->next_to_use;
1963         buffer_info = &rx_ring->buffer_info[i];
1964         cleancount = IXGB_DESC_UNUSED(rx_ring);
1965
1966         num_group_tail_writes = IXGB_RX_BUFFER_WRITE;
1967
1968         /* leave three descriptors unused */
1969         while(--cleancount > 2) {
1970                 rx_desc = IXGB_RX_DESC(*rx_ring, i);
1971
1972                 skb = dev_alloc_skb(adapter->rx_buffer_len + NET_IP_ALIGN);
1973
1974                 if(unlikely(!skb)) {
1975                         /* Better luck next round */
1976                         break;
1977                 }
1978
1979                 /* Make buffer alignment 2 beyond a 16 byte boundary
1980                  * this will result in a 16 byte aligned IP header after
1981                  * the 14 byte MAC header is removed
1982                  */
1983                 skb_reserve(skb, NET_IP_ALIGN);
1984
1985                 skb->dev = netdev;
1986
1987                 buffer_info->skb = skb;
1988                 buffer_info->length = adapter->rx_buffer_len;
1989                 buffer_info->dma =
1990                         pci_map_single(pdev,
1991                                    skb->data,
1992                                    adapter->rx_buffer_len,
1993                                    PCI_DMA_FROMDEVICE);
1994
1995                 rx_desc->buff_addr = cpu_to_le64(buffer_info->dma);
1996                 /* guarantee DD bit not set now before h/w gets descriptor
1997                  * this is the rest of the workaround for h/w double
1998                  * writeback. */
1999                 rx_desc->status = 0;
2000
2001                 if((i & ~(num_group_tail_writes- 1)) == i) {
2002                         /* Force memory writes to complete before letting h/w
2003                          * know there are new descriptors to fetch.  (Only
2004                          * applicable for weak-ordered memory model archs,
2005                          * such as IA-64). */
2006                         wmb();
2007
2008                         IXGB_WRITE_REG(&adapter->hw, RDT, i);
2009                 }
2010
2011                 if(++i == rx_ring->count) i = 0;
2012                 buffer_info = &rx_ring->buffer_info[i];
2013         }
2014
2015         rx_ring->next_to_use = i;
2016 }
2017
2018 /**
2019  * ixgb_vlan_rx_register - enables or disables vlan tagging/stripping.
2020  *
2021  * @param netdev network interface device structure
2022  * @param grp indicates to enable or disable tagging/stripping
2023  **/
2024 static void
2025 ixgb_vlan_rx_register(struct net_device *netdev, struct vlan_group *grp)
2026 {
2027         struct ixgb_adapter *adapter = netdev_priv(netdev);
2028         uint32_t ctrl, rctl;
2029
2030         ixgb_irq_disable(adapter);
2031         adapter->vlgrp = grp;
2032
2033         if(grp) {
2034                 /* enable VLAN tag insert/strip */
2035                 ctrl = IXGB_READ_REG(&adapter->hw, CTRL0);
2036                 ctrl |= IXGB_CTRL0_VME;
2037                 IXGB_WRITE_REG(&adapter->hw, CTRL0, ctrl);
2038
2039                 /* enable VLAN receive filtering */
2040
2041                 rctl = IXGB_READ_REG(&adapter->hw, RCTL);
2042                 rctl |= IXGB_RCTL_VFE;
2043                 rctl &= ~IXGB_RCTL_CFIEN;
2044                 IXGB_WRITE_REG(&adapter->hw, RCTL, rctl);
2045         } else {
2046                 /* disable VLAN tag insert/strip */
2047
2048                 ctrl = IXGB_READ_REG(&adapter->hw, CTRL0);
2049                 ctrl &= ~IXGB_CTRL0_VME;
2050                 IXGB_WRITE_REG(&adapter->hw, CTRL0, ctrl);
2051
2052                 /* disable VLAN filtering */
2053
2054                 rctl = IXGB_READ_REG(&adapter->hw, RCTL);
2055                 rctl &= ~IXGB_RCTL_VFE;
2056                 IXGB_WRITE_REG(&adapter->hw, RCTL, rctl);
2057         }
2058
2059         ixgb_irq_enable(adapter);
2060 }
2061
2062 static void
2063 ixgb_vlan_rx_add_vid(struct net_device *netdev, uint16_t vid)
2064 {
2065         struct ixgb_adapter *adapter = netdev_priv(netdev);
2066         uint32_t vfta, index;
2067
2068         /* add VID to filter table */
2069
2070         index = (vid >> 5) & 0x7F;
2071         vfta = IXGB_READ_REG_ARRAY(&adapter->hw, VFTA, index);
2072         vfta |= (1 << (vid & 0x1F));
2073         ixgb_write_vfta(&adapter->hw, index, vfta);
2074 }
2075
2076 static void
2077 ixgb_vlan_rx_kill_vid(struct net_device *netdev, uint16_t vid)
2078 {
2079         struct ixgb_adapter *adapter = netdev_priv(netdev);
2080         uint32_t vfta, index;
2081
2082         ixgb_irq_disable(adapter);
2083
2084         if(adapter->vlgrp)
2085                 adapter->vlgrp->vlan_devices[vid] = NULL;
2086
2087         ixgb_irq_enable(adapter);
2088
2089         /* remove VID from filter table*/
2090
2091         index = (vid >> 5) & 0x7F;
2092         vfta = IXGB_READ_REG_ARRAY(&adapter->hw, VFTA, index);
2093         vfta &= ~(1 << (vid & 0x1F));
2094         ixgb_write_vfta(&adapter->hw, index, vfta);
2095 }
2096
2097 static void
2098 ixgb_restore_vlan(struct ixgb_adapter *adapter)
2099 {
2100         ixgb_vlan_rx_register(adapter->netdev, adapter->vlgrp);
2101
2102         if(adapter->vlgrp) {
2103                 uint16_t vid;
2104                 for(vid = 0; vid < VLAN_GROUP_ARRAY_LEN; vid++) {
2105                         if(!adapter->vlgrp->vlan_devices[vid])
2106                                 continue;
2107                         ixgb_vlan_rx_add_vid(adapter->netdev, vid);
2108                 }
2109         }
2110 }
2111
2112 #ifdef CONFIG_NET_POLL_CONTROLLER
2113 /*
2114  * Polling 'interrupt' - used by things like netconsole to send skbs
2115  * without having to re-enable interrupts. It's not called while
2116  * the interrupt routine is executing.
2117  */
2118
2119 static void ixgb_netpoll(struct net_device *dev)
2120 {
2121         struct ixgb_adapter *adapter = dev->priv;
2122
2123         disable_irq(adapter->pdev->irq);
2124         ixgb_intr(adapter->pdev->irq, dev, NULL);
2125         enable_irq(adapter->pdev->irq);
2126 }
2127 #endif
2128
2129 /* ixgb_main.c */