drivers/net/ixgb/ixgb_main.c

   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  * 1.0.88 01/05/05
  33  * - include fix to the condition that determines when to quit NAPI - Robert Olsson
  34  * - use netif_poll_{disable/enable} to synchronize between NAPI and i/f up/down
  35  * 1.0.84 10/26/04
  36  * - reset buffer_info->dma in Tx resource cleanup logic
  37  * 1.0.83 10/12/04
  38  * - sparse cleanup - shemminger@osdl.org
  39  * - fix tx resource cleanup logic
  40  */
  41
  42 char ixgb_driver_name[] = "ixgb";
  43 char ixgb_driver_string[] = "Intel(R) PRO/10GbE Network Driver";
  44
  45 #ifndef CONFIG_IXGB_NAPI
  46 #define DRIVERNAPI
  47 #else
  48 #define DRIVERNAPI "-NAPI"
  49 #endif
  50 char ixgb_driver_version[] = "1.0.95-k2"DRIVERNAPI;
  51 char ixgb_copyright[] = "Copyright (c) 1999-2005 Intel Corporation.";
  52
  53 /* ixgb_pci_tbl - PCI Device ID Table
  54  *
  55  * Wildcard entries (PCI_ANY_ID) should come last
  56  * Last entry must be all 0s
  57  *
  58  * { Vendor ID, Device ID, SubVendor ID, SubDevice ID,
  59  *   Class, Class Mask, private data (not used) }
  60  */
  61 static struct pci_device_id ixgb_pci_tbl[] = {
  62         {INTEL_VENDOR_ID, IXGB_DEVICE_ID_82597EX,
  63          PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
  64         {INTEL_VENDOR_ID, IXGB_DEVICE_ID_82597EX_SR,
  65          PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
  66         {INTEL_VENDOR_ID, IXGB_DEVICE_ID_82597EX_LR,
  67          PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
  68
  69         /* required last entry */
  70         {0,}
  71 };
  72
  73 MODULE_DEVICE_TABLE(pci, ixgb_pci_tbl);
  74
  75 /* Local Function Prototypes */
  76
  77 int ixgb_up(struct ixgb_adapter *adapter);
  78 void ixgb_down(struct ixgb_adapter *adapter, boolean_t kill_watchdog);
  79 void ixgb_reset(struct ixgb_adapter *adapter);
  80 int ixgb_setup_tx_resources(struct ixgb_adapter *adapter);
  81 int ixgb_setup_rx_resources(struct ixgb_adapter *adapter);
  82 void ixgb_free_tx_resources(struct ixgb_adapter *adapter);
  83 void ixgb_free_rx_resources(struct ixgb_adapter *adapter);
  84 void ixgb_update_stats(struct ixgb_adapter *adapter);
  85
  86 static int ixgb_init_module(void);
  87 static void ixgb_exit_module(void);
  88 static int ixgb_probe(struct pci_dev *pdev, const struct pci_device_id *ent);
  89 static void __devexit ixgb_remove(struct pci_dev *pdev);
  90 static int ixgb_sw_init(struct ixgb_adapter *adapter);
  91 static int ixgb_open(struct net_device *netdev);
  92 static int ixgb_close(struct net_device *netdev);
  93 static void ixgb_configure_tx(struct ixgb_adapter *adapter);
  94 static void ixgb_configure_rx(struct ixgb_adapter *adapter);
  95 static void ixgb_setup_rctl(struct ixgb_adapter *adapter);
  96 static void ixgb_clean_tx_ring(struct ixgb_adapter *adapter);
  97 static void ixgb_clean_rx_ring(struct ixgb_adapter *adapter);
  98 static void ixgb_set_multi(struct net_device *netdev);
  99 static void ixgb_watchdog(unsigned long data);
 100 static int ixgb_xmit_frame(struct sk_buff *skb, struct net_device *netdev);
 101 static struct net_device_stats *ixgb_get_stats(struct net_device *netdev);
 102 static int ixgb_change_mtu(struct net_device *netdev, int new_mtu);
 103 static int ixgb_set_mac(struct net_device *netdev, void *p);
 104 static irqreturn_t ixgb_intr(int irq, void *data, struct pt_regs *regs);
 105 static boolean_t ixgb_clean_tx_irq(struct ixgb_adapter *adapter);
 106
 107 #ifdef CONFIG_IXGB_NAPI
 108 static int ixgb_clean(struct net_device *netdev, int *budget);
 109 static boolean_t ixgb_clean_rx_irq(struct ixgb_adapter *adapter,
 110                                    int *work_done, int work_to_do);
 111 #else
 112 static boolean_t ixgb_clean_rx_irq(struct ixgb_adapter *adapter);
 113 #endif
 114 static void ixgb_alloc_rx_buffers(struct ixgb_adapter *adapter);
 115 void ixgb_set_ethtool_ops(struct net_device *netdev);
 116 static void ixgb_tx_timeout(struct net_device *dev);
 117 static void ixgb_tx_timeout_task(struct net_device *dev);
 118 static void ixgb_vlan_rx_register(struct net_device *netdev,
 119                                   struct vlan_group *grp);
 120 static void ixgb_vlan_rx_add_vid(struct net_device *netdev, uint16_t vid);
 121 static void ixgb_vlan_rx_kill_vid(struct net_device *netdev, uint16_t vid);
 122 static void ixgb_restore_vlan(struct ixgb_adapter *adapter);
 123
 124 #ifdef CONFIG_NET_POLL_CONTROLLER
 125 /* for netdump / net console */
 126 static void ixgb_netpoll(struct net_device *dev);
 127 #endif
 128
 129 /* Exported from other modules */
 130
 131 extern void ixgb_check_options(struct ixgb_adapter *adapter);
 132
 133 static struct pci_driver ixgb_driver = {
 134         .name     = ixgb_driver_name,
 135         .id_table = ixgb_pci_tbl,
 136         .probe    = ixgb_probe,
 137         .remove   = __devexit_p(ixgb_remove),
 138 };
 139
 140 MODULE_AUTHOR("Intel Corporation, <linux.nics@intel.com>");
 141 MODULE_DESCRIPTION("Intel(R) PRO/10GbE Network Driver");
 142 MODULE_LICENSE("GPL");
 143
 144 /* some defines for controlling descriptor fetches in h/w */
 145 #define RXDCTL_PTHRESH_DEFAULT 128      /* chip considers prefech below this */
 146 #define RXDCTL_HTHRESH_DEFAULT 16       /* chip will only prefetch if tail is
 147                                            pushed this many descriptors from head */
 148 #define RXDCTL_WTHRESH_DEFAULT 16       /* chip writes back at this many or RXT0 */
 149
 150 /**
 151  * ixgb_init_module - Driver Registration Routine
 152  *
 153  * ixgb_init_module is the first routine called when the driver is
 154  * loaded. All it does is register with the PCI subsystem.
 155  **/
 156
 157 static int __init
 158 ixgb_init_module(void)
 159 {
 160         printk(KERN_INFO "%s - version %s\n",
 161                ixgb_driver_string, ixgb_driver_version);
 162
 163         printk(KERN_INFO "%s\n", ixgb_copyright);
 164
 165         return pci_module_init(&ixgb_driver);
 166 }
 167
 168 module_init(ixgb_init_module);
 169
 170 /**
 171  * ixgb_exit_module - Driver Exit Cleanup Routine
 172  *
 173  * ixgb_exit_module is called just before the driver is removed
 174  * from memory.
 175  **/
 176
 177 static void __exit
 178 ixgb_exit_module(void)
 179 {
 180         pci_unregister_driver(&ixgb_driver);
 181 }
 182
 183 module_exit(ixgb_exit_module);
 184
 185 /**
 186  * ixgb_irq_disable - Mask off interrupt generation on the NIC
 187  * @adapter: board private structure
 188  **/
 189
 190 static inline void
 191 ixgb_irq_disable(struct ixgb_adapter *adapter)
 192 {
 193         atomic_inc(&adapter->irq_sem);
 194         IXGB_WRITE_REG(&adapter->hw, IMC, ~0);
 195         IXGB_WRITE_FLUSH(&adapter->hw);
 196         synchronize_irq(adapter->pdev->irq);
 197 }
 198
 199 /**
 200  * ixgb_irq_enable - Enable default interrupt generation settings
 201  * @adapter: board private structure
 202  **/
 203
 204 static inline void
 205 ixgb_irq_enable(struct ixgb_adapter *adapter)
 206 {
 207         if(atomic_dec_and_test(&adapter->irq_sem)) {
 208                 IXGB_WRITE_REG(&adapter->hw, IMS,
 209                                IXGB_INT_RXT0 | IXGB_INT_RXDMT0 | IXGB_INT_TXDW |
 210                                IXGB_INT_LSC);
 211                 IXGB_WRITE_FLUSH(&adapter->hw);
 212         }
 213 }
 214
 215 int
 216 ixgb_up(struct ixgb_adapter *adapter)
 217 {
 218         struct net_device *netdev = adapter->netdev;
 219         int err;
 220         int max_frame = netdev->mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;
 221         struct ixgb_hw *hw = &adapter->hw;
 222
 223         /* hardware has been reset, we need to reload some things */
 224
 225         ixgb_set_multi(netdev);
 226
 227         ixgb_restore_vlan(adapter);
 228
 229         ixgb_configure_tx(adapter);
 230         ixgb_setup_rctl(adapter);
 231         ixgb_configure_rx(adapter);
 232         ixgb_alloc_rx_buffers(adapter);
 233
 234 #ifdef CONFIG_PCI_MSI
 235         {
 236         boolean_t pcix = (IXGB_READ_REG(&adapter->hw, STATUS) &
 237                                                   IXGB_STATUS_PCIX_MODE) ? TRUE : FALSE;
 238         adapter->have_msi = TRUE;
 239
 240         if (!pcix)
 241            adapter->have_msi = FALSE;
 242         else if((err = pci_enable_msi(adapter->pdev))) {
 243                 printk (KERN_ERR
 244                  "Unable to allocate MSI interrupt Error: %d\n", err);
 245                 adapter->have_msi = FALSE;
 246                 /* proceed to try to request regular interrupt */
 247         }
 248         }
 249
 250 #endif
 251         if((err = request_irq(adapter->pdev->irq, &ixgb_intr,
 252                                   SA_SHIRQ | SA_SAMPLE_RANDOM,
 253                                   netdev->name, netdev)))
 254                 return err;
 255
 256         /* disable interrupts and get the hardware into a known state */
 257         IXGB_WRITE_REG(&adapter->hw, IMC, 0xffffffff);
 258
 259         if((hw->max_frame_size != max_frame) ||
 260                 (hw->max_frame_size !=
 261                 (IXGB_READ_REG(hw, MFS) >> IXGB_MFS_SHIFT))) {
 262
 263                 hw->max_frame_size = max_frame;
 264
 265                 IXGB_WRITE_REG(hw, MFS, hw->max_frame_size << IXGB_MFS_SHIFT);
 266
 267                 if(hw->max_frame_size >
 268                    IXGB_MAX_ENET_FRAME_SIZE_WITHOUT_FCS + ENET_FCS_LENGTH) {
 269                         uint32_t ctrl0 = IXGB_READ_REG(hw, CTRL0);
 270
 271                         if(!(ctrl0 & IXGB_CTRL0_JFE)) {
 272                                 ctrl0 |= IXGB_CTRL0_JFE;
 273                                 IXGB_WRITE_REG(hw, CTRL0, ctrl0);
 274                         }
 275                 }
 276         }
 277
 278         mod_timer(&adapter->watchdog_timer, jiffies);
 279         ixgb_irq_enable(adapter);
 280
 281 #ifdef CONFIG_IXGB_NAPI
 282         netif_poll_enable(netdev);
 283 #endif
 284         return 0;
 285 }
 286
 287 void
 288 ixgb_down(struct ixgb_adapter *adapter, boolean_t kill_watchdog)
 289 {
 290         struct net_device *netdev = adapter->netdev;
 291
 292         ixgb_irq_disable(adapter);
 293         free_irq(adapter->pdev->irq, netdev);
 294 #ifdef CONFIG_PCI_MSI
 295         if(adapter->have_msi == TRUE)
 296                 pci_disable_msi(adapter->pdev);
 297
 298 #endif
 299         if(kill_watchdog)
 300                 del_timer_sync(&adapter->watchdog_timer);
 301 #ifdef CONFIG_IXGB_NAPI
 302         netif_poll_disable(netdev);
 303 #endif
 304         adapter->link_speed = 0;
 305         adapter->link_duplex = 0;
 306         netif_carrier_off(netdev);
 307         netif_stop_queue(netdev);
 308
 309         ixgb_reset(adapter);
 310         ixgb_clean_tx_ring(adapter);
 311         ixgb_clean_rx_ring(adapter);
 312 }
 313
 314 void
 315 ixgb_reset(struct ixgb_adapter *adapter)
 316 {
 317
 318         ixgb_adapter_stop(&adapter->hw);
 319         if(!ixgb_init_hw(&adapter->hw))
 320                 IXGB_DBG("ixgb_init_hw failed.\n");
 321 }
 322
 323 /**
 324  * ixgb_probe - Device Initialization Routine
 325  * @pdev: PCI device information struct
 326  * @ent: entry in ixgb_pci_tbl
 327  *
 328  * Returns 0 on success, negative on failure
 329  *
 330  * ixgb_probe initializes an adapter identified by a pci_dev structure.
 331  * The OS initialization, configuring of the adapter private structure,
 332  * and a hardware reset occur.
 333  **/
 334
 335 static int __devinit
 336 ixgb_probe(struct pci_dev *pdev,
 337                 const struct pci_device_id *ent)
 338 {
 339         struct net_device *netdev = NULL;
 340         struct ixgb_adapter *adapter;
 341         static int cards_found = 0;
 342         unsigned long mmio_start;
 343         int mmio_len;
 344         int pci_using_dac;
 345         int i;
 346         int err;
 347
 348         if((err = pci_enable_device(pdev)))
 349                 return err;
 350
 351         if(!(err = pci_set_dma_mask(pdev, DMA_64BIT_MASK))) {
 352                 pci_using_dac = 1;
 353         } else {
 354                 if((err = pci_set_dma_mask(pdev, DMA_32BIT_MASK))) {
 355                         IXGB_ERR("No usable DMA configuration, aborting\n");
 356                         return err;
 357                 }
 358                 pci_using_dac = 0;
 359         }
 360
 361         if((err = pci_request_regions(pdev, ixgb_driver_name)))
 362                 return err;
 363
 364         pci_set_master(pdev);
 365
 366         netdev = alloc_etherdev(sizeof(struct ixgb_adapter));
 367         if(!netdev) {
 368                 err = -ENOMEM;
 369                 goto err_alloc_etherdev;
 370         }
 371
 372         SET_MODULE_OWNER(netdev);
 373         SET_NETDEV_DEV(netdev, &pdev->dev);
 374
 375         pci_set_drvdata(pdev, netdev);
 376         adapter = netdev->priv;
 377         adapter->netdev = netdev;
 378         adapter->pdev = pdev;
 379         adapter->hw.back = adapter;
 380
 381         mmio_start = pci_resource_start(pdev, BAR_0);
 382         mmio_len = pci_resource_len(pdev, BAR_0);
 383
 384         adapter->hw.hw_addr = ioremap(mmio_start, mmio_len);
 385         if(!adapter->hw.hw_addr) {
 386                 err = -EIO;
 387                 goto err_ioremap;
 388         }
 389
 390         for(i = BAR_1; i <= BAR_5; i++) {
 391                 if(pci_resource_len(pdev, i) == 0)
 392                         continue;
 393                 if(pci_resource_flags(pdev, i) & IORESOURCE_IO) {
 394                         adapter->hw.io_base = pci_resource_start(pdev, i);
 395                         break;
 396                 }
 397         }
 398
 399         netdev->open = &ixgb_open;
 400         netdev->stop = &ixgb_close;
 401         netdev->hard_start_xmit = &ixgb_xmit_frame;
 402         netdev->get_stats = &ixgb_get_stats;
 403         netdev->set_multicast_list = &ixgb_set_multi;
 404         netdev->set_mac_address = &ixgb_set_mac;
 405         netdev->change_mtu = &ixgb_change_mtu;
 406         ixgb_set_ethtool_ops(netdev);
 407         netdev->tx_timeout = &ixgb_tx_timeout;
 408         netdev->watchdog_timeo = HZ;
 409 #ifdef CONFIG_IXGB_NAPI
 410         netdev->poll = &ixgb_clean;
 411         netdev->weight = 64;
 412 #endif
 413         netdev->vlan_rx_register = ixgb_vlan_rx_register;
 414         netdev->vlan_rx_add_vid = ixgb_vlan_rx_add_vid;
 415         netdev->vlan_rx_kill_vid = ixgb_vlan_rx_kill_vid;
 416 #ifdef CONFIG_NET_POLL_CONTROLLER
 417         netdev->poll_controller = ixgb_netpoll;
 418 #endif
 419
 420         netdev->mem_start = mmio_start;
 421         netdev->mem_end = mmio_start + mmio_len;
 422         netdev->base_addr = adapter->hw.io_base;
 423
 424         adapter->bd_number = cards_found;
 425         adapter->link_speed = 0;
 426         adapter->link_duplex = 0;
 427
 428         /* setup the private structure */
 429
 430         if((err = ixgb_sw_init(adapter)))
 431                 goto err_sw_init;
 432
 433         netdev->features = NETIF_F_SG |
 434                            NETIF_F_HW_CSUM |
 435                            NETIF_F_HW_VLAN_TX |
 436                            NETIF_F_HW_VLAN_RX |
 437                            NETIF_F_HW_VLAN_FILTER;
 438 #ifdef NETIF_F_TSO
 439         netdev->features |= NETIF_F_TSO;
 440 #endif
 441
 442         if(pci_using_dac)
 443                 netdev->features |= NETIF_F_HIGHDMA;
 444
 445         /* make sure the EEPROM is good */
 446
 447         if(!ixgb_validate_eeprom_checksum(&adapter->hw)) {
 448                 printk(KERN_ERR "The EEPROM Checksum Is Not Valid\n");
 449                 err = -EIO;
 450                 goto err_eeprom;
 451         }
 452
 453         ixgb_get_ee_mac_addr(&adapter->hw, netdev->dev_addr);
 454
 455         if(!is_valid_ether_addr(netdev->dev_addr)) {
 456                 err = -EIO;
 457                 goto err_eeprom;
 458         }
 459
 460         adapter->part_num = ixgb_get_ee_pba_number(&adapter->hw);
 461
 462         init_timer(&adapter->watchdog_timer);
 463         adapter->watchdog_timer.function = &ixgb_watchdog;
 464         adapter->watchdog_timer.data = (unsigned long)adapter;
 465
 466         INIT_WORK(&adapter->tx_timeout_task,
 467                   (void (*)(void *))ixgb_tx_timeout_task, netdev);
 468
 469         if((err = register_netdev(netdev)))
 470                 goto err_register;
 471
 472         /* we're going to reset, so assume we have no link for now */
 473
 474         netif_carrier_off(netdev);
 475         netif_stop_queue(netdev);
 476
 477         printk(KERN_INFO "%s: Intel(R) PRO/10GbE Network Connection\n",
 478                    netdev->name);
 479         ixgb_check_options(adapter);
 480         /* reset the hardware with the new settings */
 481
 482         ixgb_reset(adapter);
 483
 484         cards_found++;
 485         return 0;
 486
 487 err_register:
 488 err_sw_init:
 489 err_eeprom:
 490         iounmap(adapter->hw.hw_addr);
 491 err_ioremap:
 492         free_netdev(netdev);
 493 err_alloc_etherdev:
 494         pci_release_regions(pdev);
 495         return err;
 496 }
 497
 498 /**
 499  * ixgb_remove - Device Removal Routine
 500  * @pdev: PCI device information struct
 501  *
 502  * ixgb_remove is called by the PCI subsystem to alert the driver
 503  * that it should release a PCI device.  The could be caused by a
 504  * Hot-Plug event, or because the driver is going to be removed from
 505  * memory.
 506  **/
 507
 508 static void __devexit
 509 ixgb_remove(struct pci_dev *pdev)
 510 {
 511         struct net_device *netdev = pci_get_drvdata(pdev);
 512         struct ixgb_adapter *adapter = netdev->priv;
 513
 514         unregister_netdev(netdev);
 515
 516         iounmap(adapter->hw.hw_addr);
 517         pci_release_regions(pdev);
 518
 519         free_netdev(netdev);
 520 }
 521
 522 /**
 523  * ixgb_sw_init - Initialize general software structures (struct ixgb_adapter)
 524  * @adapter: board private structure to initialize
 525  *
 526  * ixgb_sw_init initializes the Adapter private data structure.
 527  * Fields are initialized based on PCI device information and
 528  * OS network device settings (MTU size).
 529  **/
 530
 531 static int __devinit
 532 ixgb_sw_init(struct ixgb_adapter *adapter)
 533 {
 534         struct ixgb_hw *hw = &adapter->hw;
 535         struct net_device *netdev = adapter->netdev;
 536         struct pci_dev *pdev = adapter->pdev;
 537
 538         /* PCI config space info */
 539
 540         hw->vendor_id = pdev->vendor;
 541         hw->device_id = pdev->device;
 542         hw->subsystem_vendor_id = pdev->subsystem_vendor;
 543         hw->subsystem_id = pdev->subsystem_device;
 544
 545         adapter->rx_buffer_len = IXGB_RXBUFFER_2048;
 546
 547         hw->max_frame_size = netdev->mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;
 548
 549         if((hw->device_id == IXGB_DEVICE_ID_82597EX)
 550            ||(hw->device_id == IXGB_DEVICE_ID_82597EX_LR)
 551            ||(hw->device_id == IXGB_DEVICE_ID_82597EX_SR))
 552                         hw->mac_type = ixgb_82597;
 553         else {
 554                 /* should never have loaded on this device */
 555                 printk(KERN_ERR "ixgb: unsupported device id\n");
 556         }
 557
 558         /* enable flow control to be programmed */
 559         hw->fc.send_xon = 1;
 560
 561         atomic_set(&adapter->irq_sem, 1);
 562         spin_lock_init(&adapter->tx_lock);
 563
 564         return 0;
 565 }
 566
 567 /**
 568  * ixgb_open - Called when a network interface is made active
 569  * @netdev: network interface device structure
 570  *
 571  * Returns 0 on success, negative value on failure
 572  *
 573  * The open entry point is called when a network interface is made
 574  * active by the system (IFF_UP).  At this point all resources needed
 575  * for transmit and receive operations are allocated, the interrupt
 576  * handler is registered with the OS, the watchdog timer is started,
 577  * and the stack is notified that the interface is ready.
 578  **/
 579
 580 static int
 581 ixgb_open(struct net_device *netdev)
 582 {
 583         struct ixgb_adapter *adapter = netdev->priv;
 584         int err;
 585
 586         /* allocate transmit descriptors */
 587
 588         if((err = ixgb_setup_tx_resources(adapter)))
 589                 goto err_setup_tx;
 590
 591         /* allocate receive descriptors */
 592
 593         if((err = ixgb_setup_rx_resources(adapter)))
 594                 goto err_setup_rx;
 595
 596         if((err = ixgb_up(adapter)))
 597                 goto err_up;
 598
 599         return 0;
 600
 601 err_up:
 602         ixgb_free_rx_resources(adapter);
 603 err_setup_rx:
 604         ixgb_free_tx_resources(adapter);
 605 err_setup_tx:
 606         ixgb_reset(adapter);
 607
 608         return err;
 609 }
 610
 611 /**
 612  * ixgb_close - Disables a network interface
 613  * @netdev: network interface device structure
 614  *
 615  * Returns 0, this is not allowed to fail
 616  *
 617  * The close entry point is called when an interface is de-activated
 618  * by the OS.  The hardware is still under the drivers control, but
 619  * needs to be disabled.  A global MAC reset is issued to stop the
 620  * hardware, and all transmit and receive resources are freed.
 621  **/
 622
 623 static int
 624 ixgb_close(struct net_device *netdev)
 625 {
 626         struct ixgb_adapter *adapter = netdev->priv;
 627
 628         ixgb_down(adapter, TRUE);
 629
 630         ixgb_free_tx_resources(adapter);
 631         ixgb_free_rx_resources(adapter);
 632
 633         return 0;
 634 }
 635
 636 /**
 637  * ixgb_setup_tx_resources - allocate Tx resources (Descriptors)
 638  * @adapter: board private structure
 639  *
 640  * Return 0 on success, negative on failure
 641  **/
 642
 643 int
 644 ixgb_setup_tx_resources(struct ixgb_adapter *adapter)
 645 {
 646         struct ixgb_desc_ring *txdr = &adapter->tx_ring;
 647         struct pci_dev *pdev = adapter->pdev;
 648         int size;
 649
 650         size = sizeof(struct ixgb_buffer) * txdr->count;
 651         txdr->buffer_info = vmalloc(size);
 652         if(!txdr->buffer_info) {
 653                 return -ENOMEM;
 654         }
 655         memset(txdr->buffer_info, 0, size);
 656
 657         /* round up to nearest 4K */
 658
 659         txdr->size = txdr->count * sizeof(struct ixgb_tx_desc);
 660         IXGB_ROUNDUP(txdr->size, 4096);
 661
 662         txdr->desc = pci_alloc_consistent(pdev, txdr->size, &txdr->dma);
 663         if(!txdr->desc) {
 664                 vfree(txdr->buffer_info);
 665                 return -ENOMEM;
 666         }
 667         memset(txdr->desc, 0, txdr->size);
 668
 669         txdr->next_to_use = 0;
 670         txdr->next_to_clean = 0;
 671
 672         return 0;
 673 }
 674
 675 /**
 676  * ixgb_configure_tx - Configure 82597 Transmit Unit after Reset.
 677  * @adapter: board private structure
 678  *
 679  * Configure the Tx unit of the MAC after a reset.
 680  **/
 681
 682 static void
 683 ixgb_configure_tx(struct ixgb_adapter *adapter)
 684 {
 685         uint64_t tdba = adapter->tx_ring.dma;
 686         uint32_t tdlen = adapter->tx_ring.count * sizeof(struct ixgb_tx_desc);
 687         uint32_t tctl;
 688         struct ixgb_hw *hw = &adapter->hw;
 689
 690         /* Setup the Base and Length of the Tx Descriptor Ring
 691          * tx_ring.dma can be either a 32 or 64 bit value
 692          */
 693
 694         IXGB_WRITE_REG(hw, TDBAL, (tdba & 0x00000000ffffffffULL));
 695         IXGB_WRITE_REG(hw, TDBAH, (tdba >> 32));
 696
 697         IXGB_WRITE_REG(hw, TDLEN, tdlen);
 698
 699         /* Setup the HW Tx Head and Tail descriptor pointers */
 700
 701         IXGB_WRITE_REG(hw, TDH, 0);
 702         IXGB_WRITE_REG(hw, TDT, 0);
 703
 704         /* don't set up txdctl, it induces performance problems if configured
 705          * incorrectly */
 706         /* Set the Tx Interrupt Delay register */
 707
 708         IXGB_WRITE_REG(hw, TIDV, adapter->tx_int_delay);
 709
 710         /* Program the Transmit Control Register */
 711
 712         tctl = IXGB_TCTL_TCE | IXGB_TCTL_TXEN | IXGB_TCTL_TPDE;
 713         IXGB_WRITE_REG(hw, TCTL, tctl);
 714
 715         /* Setup Transmit Descriptor Settings for this adapter */
 716         adapter->tx_cmd_type =
 717                 IXGB_TX_DESC_TYPE
 718                 | (adapter->tx_int_delay_enable ? IXGB_TX_DESC_CMD_IDE : 0);
 719 }
 720
 721 /**
 722  * ixgb_setup_rx_resources - allocate Rx resources (Descriptors)
 723  * @adapter: board private structure
 724  *
 725  * Returns 0 on success, negative on failure
 726  **/
 727
 728 int
 729 ixgb_setup_rx_resources(struct ixgb_adapter *adapter)
 730 {
 731         struct ixgb_desc_ring *rxdr = &adapter->rx_ring;
 732         struct pci_dev *pdev = adapter->pdev;
 733         int size;
 734
 735         size = sizeof(struct ixgb_buffer) * rxdr->count;
 736         rxdr->buffer_info = vmalloc(size);
 737         if(!rxdr->buffer_info) {
 738                 return -ENOMEM;
 739         }
 740         memset(rxdr->buffer_info, 0, size);
 741
 742         /* Round up to nearest 4K */
 743
 744         rxdr->size = rxdr->count * sizeof(struct ixgb_rx_desc);
 745         IXGB_ROUNDUP(rxdr->size, 4096);
 746
 747         rxdr->desc = pci_alloc_consistent(pdev, rxdr->size, &rxdr->dma);
 748
 749         if(!rxdr->desc) {
 750                 vfree(rxdr->buffer_info);
 751                 return -ENOMEM;
 752         }
 753         memset(rxdr->desc, 0, rxdr->size);
 754
 755         rxdr->next_to_clean = 0;
 756         rxdr->next_to_use = 0;
 757
 758         return 0;
 759 }
 760
 761 /**
 762  * ixgb_setup_rctl - configure the receive control register
 763  * @adapter: Board private structure
 764  **/
 765
 766 static void
 767 ixgb_setup_rctl(struct ixgb_adapter *adapter)
 768 {
 769         uint32_t rctl;
 770
 771         rctl = IXGB_READ_REG(&adapter->hw, RCTL);
 772
 773         rctl &= ~(3 << IXGB_RCTL_MO_SHIFT);
 774
 775         rctl |=
 776                 IXGB_RCTL_BAM | IXGB_RCTL_RDMTS_1_2 |
 777                 IXGB_RCTL_RXEN | IXGB_RCTL_CFF |
 778                 (adapter->hw.mc_filter_type << IXGB_RCTL_MO_SHIFT);
 779
 780         rctl |= IXGB_RCTL_SECRC;
 781
 782         switch (adapter->rx_buffer_len) {
 783         case IXGB_RXBUFFER_2048:
 784         default:
 785                 rctl |= IXGB_RCTL_BSIZE_2048;
 786                 break;
 787         case IXGB_RXBUFFER_4096:
 788                 rctl |= IXGB_RCTL_BSIZE_4096;
 789                 break;
 790         case IXGB_RXBUFFER_8192:
 791                 rctl |= IXGB_RCTL_BSIZE_8192;
 792                 break;
 793         case IXGB_RXBUFFER_16384:
 794                 rctl |= IXGB_RCTL_BSIZE_16384;
 795                 break;
 796         }
 797
 798         IXGB_WRITE_REG(&adapter->hw, RCTL, rctl);
 799 }
 800
 801 /**
 802  * ixgb_configure_rx - Configure 82597 Receive Unit after Reset.
 803  * @adapter: board private structure
 804  *
 805  * Configure the Rx unit of the MAC after a reset.
 806  **/
 807
 808 static void
 809 ixgb_configure_rx(struct ixgb_adapter *adapter)
 810 {
 811         uint64_t rdba = adapter->rx_ring.dma;
 812         uint32_t rdlen = adapter->rx_ring.count * sizeof(struct ixgb_rx_desc);
 813         struct ixgb_hw *hw = &adapter->hw;
 814         uint32_t rctl;
 815         uint32_t rxcsum;
 816         uint32_t rxdctl;
 817
 818         /* make sure receives are disabled while setting up the descriptors */
 819
 820         rctl = IXGB_READ_REG(hw, RCTL);
 821         IXGB_WRITE_REG(hw, RCTL, rctl & ~IXGB_RCTL_RXEN);
 822
 823         /* set the Receive Delay Timer Register */
 824
 825         IXGB_WRITE_REG(hw, RDTR, adapter->rx_int_delay);
 826
 827         /* Setup the Base and Length of the Rx Descriptor Ring */
 828
 829         IXGB_WRITE_REG(hw, RDBAL, (rdba & 0x00000000ffffffffULL));
 830         IXGB_WRITE_REG(hw, RDBAH, (rdba >> 32));
 831
 832         IXGB_WRITE_REG(hw, RDLEN, rdlen);
 833
 834         /* Setup the HW Rx Head and Tail Descriptor Pointers */
 835         IXGB_WRITE_REG(hw, RDH, 0);
 836         IXGB_WRITE_REG(hw, RDT, 0);
 837
 838         /* set up pre-fetching of receive buffers so we get some before we
 839          * run out (default hardware behavior is to run out before fetching
 840          * more).  This sets up to fetch if HTHRESH rx descriptors are avail
 841          * and the descriptors in hw cache are below PTHRESH.  This avoids
 842          * the hardware behavior of fetching <=512 descriptors in a single
 843          * burst that pre-empts all other activity, usually causing fifo
 844          * overflows. */
 845         /* use WTHRESH to burst write 16 descriptors or burst when RXT0 */
 846         rxdctl = RXDCTL_WTHRESH_DEFAULT << IXGB_RXDCTL_WTHRESH_SHIFT |
 847                  RXDCTL_HTHRESH_DEFAULT << IXGB_RXDCTL_HTHRESH_SHIFT |
 848                  RXDCTL_PTHRESH_DEFAULT << IXGB_RXDCTL_PTHRESH_SHIFT;
 849         IXGB_WRITE_REG(hw, RXDCTL, rxdctl);
 850
 851         /* Enable Receive Checksum Offload for TCP and UDP */
 852         if(adapter->rx_csum == TRUE) {
 853                 rxcsum = IXGB_READ_REG(hw, RXCSUM);
 854                 rxcsum |= IXGB_RXCSUM_TUOFL;
 855                 IXGB_WRITE_REG(hw, RXCSUM, rxcsum);
 856         }
 857
 858         /* Enable Receives */
 859
 860         IXGB_WRITE_REG(hw, RCTL, rctl);
 861 }
 862
 863 /**
 864  * ixgb_free_tx_resources - Free Tx Resources
 865  * @adapter: board private structure
 866  *
 867  * Free all transmit software resources
 868  **/
 869
 870 void
 871 ixgb_free_tx_resources(struct ixgb_adapter *adapter)
 872 {
 873         struct pci_dev *pdev = adapter->pdev;
 874
 875         ixgb_clean_tx_ring(adapter);
 876
 877         vfree(adapter->tx_ring.buffer_info);
 878         adapter->tx_ring.buffer_info = NULL;
 879
 880         pci_free_consistent(pdev, adapter->tx_ring.size,
 881                             adapter->tx_ring.desc, adapter->tx_ring.dma);
 882
 883         adapter->tx_ring.desc = NULL;
 884 }
 885
 886 static inline void
 887 ixgb_unmap_and_free_tx_resource(struct ixgb_adapter *adapter,
 888                                         struct ixgb_buffer *buffer_info)
 889 {
 890         struct pci_dev *pdev = adapter->pdev;
 891         if(buffer_info->dma) {
 892                 pci_unmap_page(pdev,
 893                            buffer_info->dma,
 894                            buffer_info->length,
 895                            PCI_DMA_TODEVICE);
 896                 buffer_info->dma = 0;
 897         }
 898         if(buffer_info->skb) {
 899                 dev_kfree_skb_any(buffer_info->skb);
 900                 buffer_info->skb = NULL;
 901         }
 902 }
 903
 904 /**
 905  * ixgb_clean_tx_ring - Free Tx Buffers
 906  * @adapter: board private structure
 907  **/
 908
 909 static void
 910 ixgb_clean_tx_ring(struct ixgb_adapter *adapter)
 911 {
 912         struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
 913         struct ixgb_buffer *buffer_info;
 914         unsigned long size;
 915         unsigned int i;
 916
 917         /* Free all the Tx ring sk_buffs */
 918
 919         for(i = 0; i < tx_ring->count; i++) {
 920                 buffer_info = &tx_ring->buffer_info[i];
 921                 ixgb_unmap_and_free_tx_resource(adapter, buffer_info);
 922         }
 923
 924         size = sizeof(struct ixgb_buffer) * tx_ring->count;
 925         memset(tx_ring->buffer_info, 0, size);
 926
 927         /* Zero out the descriptor ring */
 928
 929         memset(tx_ring->desc, 0, tx_ring->size);
 930
 931         tx_ring->next_to_use = 0;
 932         tx_ring->next_to_clean = 0;
 933
 934         IXGB_WRITE_REG(&adapter->hw, TDH, 0);
 935         IXGB_WRITE_REG(&adapter->hw, TDT, 0);
 936 }
 937
 938 /**
 939  * ixgb_free_rx_resources - Free Rx Resources
 940  * @adapter: board private structure
 941  *
 942  * Free all receive software resources
 943  **/
 944
 945 void
 946 ixgb_free_rx_resources(struct ixgb_adapter *adapter)
 947 {
 948         struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
 949         struct pci_dev *pdev = adapter->pdev;
 950
 951         ixgb_clean_rx_ring(adapter);
 952
 953         vfree(rx_ring->buffer_info);
 954         rx_ring->buffer_info = NULL;
 955
 956         pci_free_consistent(pdev, rx_ring->size, rx_ring->desc, rx_ring->dma);
 957
 958         rx_ring->desc = NULL;
 959 }
 960
 961 /**
 962  * ixgb_clean_rx_ring - Free Rx Buffers
 963  * @adapter: board private structure
 964  **/
 965
 966 static void
 967 ixgb_clean_rx_ring(struct ixgb_adapter *adapter)
 968 {
 969         struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
 970         struct ixgb_buffer *buffer_info;
 971         struct pci_dev *pdev = adapter->pdev;
 972         unsigned long size;
 973         unsigned int i;
 974
 975         /* Free all the Rx ring sk_buffs */
 976
 977         for(i = 0; i < rx_ring->count; i++) {
 978                 buffer_info = &rx_ring->buffer_info[i];
 979                 if(buffer_info->skb) {
 980
 981                         pci_unmap_single(pdev,
 982                                          buffer_info->dma,
 983                                          buffer_info->length,
 984                                          PCI_DMA_FROMDEVICE);
 985
 986                         dev_kfree_skb(buffer_info->skb);
 987
 988                         buffer_info->skb = NULL;
 989                 }
 990         }
 991
 992         size = sizeof(struct ixgb_buffer) * rx_ring->count;
 993         memset(rx_ring->buffer_info, 0, size);
 994
 995         /* Zero out the descriptor ring */
 996
 997         memset(rx_ring->desc, 0, rx_ring->size);
 998
 999         rx_ring->next_to_clean = 0;
1000         rx_ring->next_to_use = 0;
1001
1002         IXGB_WRITE_REG(&adapter->hw, RDH, 0);
1003         IXGB_WRITE_REG(&adapter->hw, RDT, 0);
1004 }
1005
1006 /**
1007  * ixgb_set_mac - Change the Ethernet Address of the NIC
1008  * @netdev: network interface device structure
1009  * @p: pointer to an address structure
1010  *
1011  * Returns 0 on success, negative on failure
1012  **/
1013
1014 static int
1015 ixgb_set_mac(struct net_device *netdev, void *p)
1016 {
1017         struct ixgb_adapter *adapter = netdev->priv;
1018         struct sockaddr *addr = p;
1019
1020         if(!is_valid_ether_addr(addr->sa_data))
1021                 return -EADDRNOTAVAIL;
1022
1023         memcpy(netdev->dev_addr, addr->sa_data, netdev->addr_len);
1024
1025         ixgb_rar_set(&adapter->hw, addr->sa_data, 0);
1026
1027         return 0;
1028 }
1029
1030 /**
1031  * ixgb_set_multi - Multicast and Promiscuous mode set
1032  * @netdev: network interface device structure
1033  *
1034  * The set_multi entry point is called whenever the multicast address
1035  * list or the network interface flags are updated.  This routine is
1036  * responsible for configuring the hardware for proper multicast,
1037  * promiscuous mode, and all-multi behavior.
1038  **/
1039
1040 static void
1041 ixgb_set_multi(struct net_device *netdev)
1042 {
1043         struct ixgb_adapter *adapter = netdev->priv;
1044         struct ixgb_hw *hw = &adapter->hw;
1045         struct dev_mc_list *mc_ptr;
1046         uint32_t rctl;
1047         int i;
1048
1049         /* Check for Promiscuous and All Multicast modes */
1050
1051         rctl = IXGB_READ_REG(hw, RCTL);
1052
1053         if(netdev->flags & IFF_PROMISC) {
1054                 rctl |= (IXGB_RCTL_UPE | IXGB_RCTL_MPE);
1055         } else if(netdev->flags & IFF_ALLMULTI) {
1056                 rctl |= IXGB_RCTL_MPE;
1057                 rctl &= ~IXGB_RCTL_UPE;
1058         } else {
1059                 rctl &= ~(IXGB_RCTL_UPE | IXGB_RCTL_MPE);
1060         }
1061
1062         if(netdev->mc_count > IXGB_MAX_NUM_MULTICAST_ADDRESSES) {
1063                 rctl |= IXGB_RCTL_MPE;
1064                 IXGB_WRITE_REG(hw, RCTL, rctl);
1065         } else {
1066                 uint8_t mta[netdev->mc_count * IXGB_ETH_LENGTH_OF_ADDRESS];
1067
1068                 IXGB_WRITE_REG(hw, RCTL, rctl);
1069
1070                 for(i = 0, mc_ptr = netdev->mc_list; mc_ptr;
1071                         i++, mc_ptr = mc_ptr->next)
1072                         memcpy(&mta[i * IXGB_ETH_LENGTH_OF_ADDRESS],
1073                                    mc_ptr->dmi_addr, IXGB_ETH_LENGTH_OF_ADDRESS);
1074
1075                 ixgb_mc_addr_list_update(hw, mta, netdev->mc_count, 0);
1076         }
1077 }
1078
1079 /**
1080  * ixgb_watchdog - Timer Call-back
1081  * @data: pointer to netdev cast into an unsigned long
1082  **/
1083
1084 static void
1085 ixgb_watchdog(unsigned long data)
1086 {
1087         struct ixgb_adapter *adapter = (struct ixgb_adapter *)data;
1088         struct net_device *netdev = adapter->netdev;
1089         struct ixgb_desc_ring *txdr = &adapter->tx_ring;
1090
1091         ixgb_check_for_link(&adapter->hw);
1092
1093         if (ixgb_check_for_bad_link(&adapter->hw)) {
1094                 /* force the reset path */
1095                 netif_stop_queue(netdev);
1096         }
1097
1098         if(adapter->hw.link_up) {
1099                 if(!netif_carrier_ok(netdev)) {
1100                         printk(KERN_INFO "ixgb: %s NIC Link is Up %d Mbps %s\n",
1101                                    netdev->name, 10000, "Full Duplex");
1102                         adapter->link_speed = 10000;
1103                         adapter->link_duplex = FULL_DUPLEX;
1104                         netif_carrier_on(netdev);
1105                         netif_wake_queue(netdev);
1106                 }
1107         } else {
1108                 if(netif_carrier_ok(netdev)) {
1109                         adapter->link_speed = 0;
1110                         adapter->link_duplex = 0;
1111                         printk(KERN_INFO
1112                                    "ixgb: %s NIC Link is Down\n",
1113                                    netdev->name);
1114                         netif_carrier_off(netdev);
1115                         netif_stop_queue(netdev);
1116
1117                 }
1118         }
1119
1120         ixgb_update_stats(adapter);
1121
1122         if(!netif_carrier_ok(netdev)) {
1123                 if(IXGB_DESC_UNUSED(txdr) + 1 < txdr->count) {
1124                         /* We've lost link, so the controller stops DMA,
1125                          * but we've got queued Tx work that's never going
1126                          * to get done, so reset controller to flush Tx.
1127                          * (Do the reset outside of interrupt context). */
1128                         schedule_work(&adapter->tx_timeout_task);
1129                 }
1130         }
1131
1132         /* Force detection of hung controller every watchdog period */
1133         adapter->detect_tx_hung = TRUE;
1134
1135         /* generate an interrupt to force clean up of any stragglers */
1136         IXGB_WRITE_REG(&adapter->hw, ICS, IXGB_INT_TXDW);
1137
1138         /* Reset the timer */
1139         mod_timer(&adapter->watchdog_timer, jiffies + 2 * HZ);
1140 }
1141
1142 #define IXGB_TX_FLAGS_CSUM              0x00000001
1143 #define IXGB_TX_FLAGS_VLAN              0x00000002
1144 #define IXGB_TX_FLAGS_TSO               0x00000004
1145
1146 static inline int
1147 ixgb_tso(struct ixgb_adapter *adapter, struct sk_buff *skb)
1148 {
1149 #ifdef NETIF_F_TSO
1150         struct ixgb_context_desc *context_desc;
1151         unsigned int i;
1152         uint8_t ipcss, ipcso, tucss, tucso, hdr_len;
1153         uint16_t ipcse, tucse, mss;
1154         int err;
1155
1156         if(likely(skb_shinfo(skb)->tso_size)) {
1157                 if (skb_header_cloned(skb)) {
1158                         err = pskb_expand_head(skb, 0, 0, GFP_ATOMIC);
1159                         if (err)
1160                                 return err;
1161                 }
1162
1163                 hdr_len = ((skb->h.raw - skb->data) + (skb->h.th->doff << 2));
1164                 mss = skb_shinfo(skb)->tso_size;
1165                 skb->nh.iph->tot_len = 0;
1166                 skb->nh.iph->check = 0;
1167                 skb->h.th->check = ~csum_tcpudp_magic(skb->nh.iph->saddr,
1168                                                       skb->nh.iph->daddr,
1169                                                       0, IPPROTO_TCP, 0);
1170                 ipcss = skb->nh.raw - skb->data;
1171                 ipcso = (void *)&(skb->nh.iph->check) - (void *)skb->data;
1172                 ipcse = skb->h.raw - skb->data - 1;
1173                 tucss = skb->h.raw - skb->data;
1174                 tucso = (void *)&(skb->h.th->check) - (void *)skb->data;
1175                 tucse = 0;
1176
1177                 i = adapter->tx_ring.next_to_use;
1178                 context_desc = IXGB_CONTEXT_DESC(adapter->tx_ring, i);
1179
1180                 context_desc->ipcss = ipcss;
1181                 context_desc->ipcso = ipcso;
1182                 context_desc->ipcse = cpu_to_le16(ipcse);
1183                 context_desc->tucss = tucss;
1184                 context_desc->tucso = tucso;
1185                 context_desc->tucse = cpu_to_le16(tucse);
1186                 context_desc->mss = cpu_to_le16(mss);
1187                 context_desc->hdr_len = hdr_len;
1188                 context_desc->status = 0;
1189                 context_desc->cmd_type_len = cpu_to_le32(
1190                                                   IXGB_CONTEXT_DESC_TYPE
1191                                                 | IXGB_CONTEXT_DESC_CMD_TSE
1192                                                 | IXGB_CONTEXT_DESC_CMD_IP
1193                                                 | IXGB_CONTEXT_DESC_CMD_TCP
1194                                                 | IXGB_CONTEXT_DESC_CMD_IDE
1195                                                 | (skb->len - (hdr_len)));
1196
1197
1198                 if(++i == adapter->tx_ring.count) i = 0;
1199                 adapter->tx_ring.next_to_use = i;
1200
1201                 return 1;
1202         }
1203 #endif
1204
1205         return 0;
1206 }
1207
1208 static inline boolean_t
1209 ixgb_tx_csum(struct ixgb_adapter *adapter, struct sk_buff *skb)
1210 {
1211         struct ixgb_context_desc *context_desc;
1212         unsigned int i;
1213         uint8_t css, cso;
1214
1215         if(likely(skb->ip_summed == CHECKSUM_HW)) {
1216                 css = skb->h.raw - skb->data;
1217                 cso = (skb->h.raw + skb->csum) - skb->data;
1218
1219                 i = adapter->tx_ring.next_to_use;
1220                 context_desc = IXGB_CONTEXT_DESC(adapter->tx_ring, i);
1221
1222                 context_desc->tucss = css;
1223                 context_desc->tucso = cso;
1224                 context_desc->tucse = 0;
1225                 /* zero out any previously existing data in one instruction */
1226                 *(uint32_t *)&(context_desc->ipcss) = 0;
1227                 context_desc->status = 0;
1228                 context_desc->hdr_len = 0;
1229                 context_desc->mss = 0;
1230                 context_desc->cmd_type_len =
1231                         cpu_to_le32(IXGB_CONTEXT_DESC_TYPE
1232                                     | IXGB_TX_DESC_CMD_IDE);
1233
1234                 if(++i == adapter->tx_ring.count) i = 0;
1235                 adapter->tx_ring.next_to_use = i;
1236
1237                 return TRUE;
1238         }
1239
1240         return FALSE;
1241 }
1242
1243 #define IXGB_MAX_TXD_PWR        14
1244 #define IXGB_MAX_DATA_PER_TXD   (1<<IXGB_MAX_TXD_PWR)
1245
1246 static inline int
1247 ixgb_tx_map(struct ixgb_adapter *adapter, struct sk_buff *skb,
1248             unsigned int first)
1249 {
1250         struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
1251         struct ixgb_buffer *buffer_info;
1252         int len = skb->len;
1253         unsigned int offset = 0, size, count = 0, i;
1254
1255         unsigned int nr_frags = skb_shinfo(skb)->nr_frags;
1256         unsigned int f;
1257
1258         len -= skb->data_len;
1259
1260         i = tx_ring->next_to_use;
1261
1262         while(len) {
1263                 buffer_info = &tx_ring->buffer_info[i];
1264                 size = min(len, IXGB_MAX_JUMBO_FRAME_SIZE);
1265                 buffer_info->length = size;
1266                 buffer_info->dma =
1267                         pci_map_single(adapter->pdev,
1268                                 skb->data + offset,
1269                                 size,
1270                                 PCI_DMA_TODEVICE);
1271                 buffer_info->time_stamp = jiffies;
1272
1273                 len -= size;
1274                 offset += size;
1275                 count++;
1276                 if(++i == tx_ring->count) i = 0;
1277         }
1278
1279         for(f = 0; f < nr_frags; f++) {
1280                 struct skb_frag_struct *frag;
1281
1282                 frag = &skb_shinfo(skb)->frags[f];
1283                 len = frag->size;
1284                 offset = 0;
1285
1286                 while(len) {
1287                         buffer_info = &tx_ring->buffer_info[i];
1288                         size = min(len, IXGB_MAX_JUMBO_FRAME_SIZE);
1289                         buffer_info->length = size;
1290                         buffer_info->dma =
1291                                 pci_map_page(adapter->pdev,
1292                                         frag->page,
1293                                         frag->page_offset + offset,
1294                                         size,
1295                                         PCI_DMA_TODEVICE);
1296                         buffer_info->time_stamp = jiffies;
1297
1298                         len -= size;
1299                         offset += size;
1300                         count++;
1301                         if(++i == tx_ring->count) i = 0;
1302                 }
1303         }
1304         i = (i == 0) ? tx_ring->count - 1 : i - 1;
1305         tx_ring->buffer_info[i].skb = skb;
1306         tx_ring->buffer_info[first].next_to_watch = i;
1307
1308         return count;
1309 }
1310
1311 static inline void
1312 ixgb_tx_queue(struct ixgb_adapter *adapter, int count, int vlan_id,int tx_flags)
1313 {
1314         struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
1315         struct ixgb_tx_desc *tx_desc = NULL;
1316         struct ixgb_buffer *buffer_info;
1317         uint32_t cmd_type_len = adapter->tx_cmd_type;
1318         uint8_t status = 0;
1319         uint8_t popts = 0;
1320         unsigned int i;
1321
1322         if(tx_flags & IXGB_TX_FLAGS_TSO) {
1323                 cmd_type_len |= IXGB_TX_DESC_CMD_TSE;
1324                 popts |= (IXGB_TX_DESC_POPTS_IXSM | IXGB_TX_DESC_POPTS_TXSM);
1325         }
1326
1327         if(tx_flags & IXGB_TX_FLAGS_CSUM)
1328                 popts |= IXGB_TX_DESC_POPTS_TXSM;
1329
1330         if(tx_flags & IXGB_TX_FLAGS_VLAN) {
1331                 cmd_type_len |= IXGB_TX_DESC_CMD_VLE;
1332         }
1333
1334         i = tx_ring->next_to_use;
1335
1336         while(count--) {
1337                 buffer_info = &tx_ring->buffer_info[i];
1338                 tx_desc = IXGB_TX_DESC(*tx_ring, i);
1339                 tx_desc->buff_addr = cpu_to_le64(buffer_info->dma);
1340                 tx_desc->cmd_type_len =
1341                         cpu_to_le32(cmd_type_len | buffer_info->length);
1342                 tx_desc->status = status;
1343                 tx_desc->popts = popts;
1344                 tx_desc->vlan = cpu_to_le16(vlan_id);
1345
1346                 if(++i == tx_ring->count) i = 0;
1347         }
1348
1349         tx_desc->cmd_type_len |= cpu_to_le32(IXGB_TX_DESC_CMD_EOP
1350                                 | IXGB_TX_DESC_CMD_RS );
1351
1352         /* Force memory writes to complete before letting h/w
1353          * know there are new descriptors to fetch.  (Only
1354          * applicable for weak-ordered memory model archs,
1355          * such as IA-64). */
1356         wmb();
1357
1358         tx_ring->next_to_use = i;
1359         IXGB_WRITE_REG(&adapter->hw, TDT, i);
1360 }
1361
1362 /* Tx Descriptors needed, worst case */
1363 #define TXD_USE_COUNT(S) (((S) >> IXGB_MAX_TXD_PWR) + \
1364                          (((S) & (IXGB_MAX_DATA_PER_TXD - 1)) ? 1 : 0))
1365 #define DESC_NEEDED TXD_USE_COUNT(IXGB_MAX_DATA_PER_TXD) + \
1366         MAX_SKB_FRAGS * TXD_USE_COUNT(PAGE_SIZE) + 1
1367
1368 static int
1369 ixgb_xmit_frame(struct sk_buff *skb, struct net_device *netdev)
1370 {
1371         struct ixgb_adapter *adapter = netdev->priv;
1372         unsigned int first;
1373         unsigned int tx_flags = 0;
1374         unsigned long flags;
1375         int vlan_id = 0;
1376         int tso;
1377
1378         if(skb->len <= 0) {
1379                 dev_kfree_skb_any(skb);
1380                 return 0;
1381         }
1382
1383         spin_lock_irqsave(&adapter->tx_lock, flags);
1384         if(unlikely(IXGB_DESC_UNUSED(&adapter->tx_ring) < DESC_NEEDED)) {
1385                 netif_stop_queue(netdev);
1386                 spin_unlock_irqrestore(&adapter->tx_lock, flags);
1387                 return 1;
1388         }
1389         spin_unlock_irqrestore(&adapter->tx_lock, flags);
1390
1391         if(adapter->vlgrp && vlan_tx_tag_present(skb)) {
1392                 tx_flags |= IXGB_TX_FLAGS_VLAN;
1393                 vlan_id = vlan_tx_tag_get(skb);
1394         }
1395
1396         first = adapter->tx_ring.next_to_use;
1397
1398         tso = ixgb_tso(adapter, skb);
1399         if (tso < 0) {
1400                 dev_kfree_skb_any(skb);
1401                 return NETDEV_TX_OK;
1402         }
1403
1404         if (tso)
1405                 tx_flags |= IXGB_TX_FLAGS_TSO;
1406         else if(ixgb_tx_csum(adapter, skb))
1407                 tx_flags |= IXGB_TX_FLAGS_CSUM;
1408
1409         ixgb_tx_queue(adapter, ixgb_tx_map(adapter, skb, first), vlan_id,
1410                         tx_flags);
1411
1412         netdev->trans_start = jiffies;
1413
1414         return 0;
1415 }
1416
1417 /**
1418  * ixgb_tx_timeout - Respond to a Tx Hang
1419  * @netdev: network interface device structure
1420  **/
1421
1422 static void
1423 ixgb_tx_timeout(struct net_device *netdev)
1424 {
1425         struct ixgb_adapter *adapter = netdev->priv;
1426
1427         /* Do the reset outside of interrupt context */
1428         schedule_work(&adapter->tx_timeout_task);
1429 }
1430
1431 static void
1432 ixgb_tx_timeout_task(struct net_device *netdev)
1433 {
1434         struct ixgb_adapter *adapter = netdev->priv;
1435
1436         ixgb_down(adapter, TRUE);
1437         ixgb_up(adapter);
1438 }
1439
1440 /**
1441  * ixgb_get_stats - Get System Network Statistics
1442  * @netdev: network interface device structure
1443  *
1444  * Returns the address of the device statistics structure.
1445  * The statistics are actually updated from the timer callback.
1446  **/
1447
1448 static struct net_device_stats *
1449 ixgb_get_stats(struct net_device *netdev)
1450 {
1451         struct ixgb_adapter *adapter = netdev->priv;
1452
1453         return &adapter->net_stats;
1454 }
1455
1456 /**
1457  * ixgb_change_mtu - Change the Maximum Transfer Unit
1458  * @netdev: network interface device structure
1459  * @new_mtu: new value for maximum frame size
1460  *
1461  * Returns 0 on success, negative on failure
1462  **/
1463
1464 static int
1465 ixgb_change_mtu(struct net_device *netdev, int new_mtu)
1466 {
1467         struct ixgb_adapter *adapter = netdev->priv;
1468         int max_frame = new_mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;
1469         int old_max_frame = netdev->mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;
1470
1471
1472         if((max_frame < IXGB_MIN_ENET_FRAME_SIZE_WITHOUT_FCS + ENET_FCS_LENGTH)
1473            || (max_frame > IXGB_MAX_JUMBO_FRAME_SIZE + ENET_FCS_LENGTH)) {
1474                 IXGB_ERR("Invalid MTU setting\n");
1475                 return -EINVAL;
1476         }
1477
1478         if((max_frame <= IXGB_MAX_ENET_FRAME_SIZE_WITHOUT_FCS + ENET_FCS_LENGTH)
1479            || (max_frame <= IXGB_RXBUFFER_2048)) {
1480                 adapter->rx_buffer_len = IXGB_RXBUFFER_2048;
1481
1482         } else if(max_frame <= IXGB_RXBUFFER_4096) {
1483                 adapter->rx_buffer_len = IXGB_RXBUFFER_4096;
1484
1485         } else if(max_frame <= IXGB_RXBUFFER_8192) {
1486                 adapter->rx_buffer_len = IXGB_RXBUFFER_8192;
1487
1488         } else {
1489                 adapter->rx_buffer_len = IXGB_RXBUFFER_16384;
1490         }
1491
1492         netdev->mtu = new_mtu;
1493
1494         if(old_max_frame != max_frame && netif_running(netdev)) {
1495
1496                 ixgb_down(adapter, TRUE);
1497                 ixgb_up(adapter);
1498         }
1499
1500         return 0;
1501 }
1502
1503 /**
1504  * ixgb_update_stats - Update the board statistics counters.
1505  * @adapter: board private structure
1506  **/
1507
1508 void
1509 ixgb_update_stats(struct ixgb_adapter *adapter)
1510 {
1511         struct net_device *netdev = adapter->netdev;
1512
1513         if((netdev->flags & IFF_PROMISC) || (netdev->flags & IFF_ALLMULTI) ||
1514            (netdev->mc_count > IXGB_MAX_NUM_MULTICAST_ADDRESSES)) {
1515                 u64 multi = IXGB_READ_REG(&adapter->hw, MPRCL);
1516                 u32 bcast_l = IXGB_READ_REG(&adapter->hw, BPRCL);
1517                 u32 bcast_h = IXGB_READ_REG(&adapter->hw, BPRCH);
1518                 u64 bcast = ((u64)bcast_h << 32) | bcast_l;
1519
1520                 multi |= ((u64)IXGB_READ_REG(&adapter->hw, MPRCH) << 32);
1521                 /* fix up multicast stats by removing broadcasts */
1522                 multi -= bcast;
1523
1524                 adapter->stats.mprcl += (multi & 0xFFFFFFFF);
1525                 adapter->stats.mprch += (multi >> 32);
1526                 adapter->stats.bprcl += bcast_l;
1527                 adapter->stats.bprch += bcast_h;
1528         } else {
1529                 adapter->stats.mprcl += IXGB_READ_REG(&adapter->hw, MPRCL);
1530                 adapter->stats.mprch += IXGB_READ_REG(&adapter->hw, MPRCH);
1531                 adapter->stats.bprcl += IXGB_READ_REG(&adapter->hw, BPRCL);
1532                 adapter->stats.bprch += IXGB_READ_REG(&adapter->hw, BPRCH);
1533         }
1534         adapter->stats.tprl += IXGB_READ_REG(&adapter->hw, TPRL);
1535         adapter->stats.tprh += IXGB_READ_REG(&adapter->hw, TPRH);
1536         adapter->stats.gprcl += IXGB_READ_REG(&adapter->hw, GPRCL);
1537         adapter->stats.gprch += IXGB_READ_REG(&adapter->hw, GPRCH);
1538         adapter->stats.uprcl += IXGB_READ_REG(&adapter->hw, UPRCL);
1539         adapter->stats.uprch += IXGB_READ_REG(&adapter->hw, UPRCH);
1540         adapter->stats.vprcl += IXGB_READ_REG(&adapter->hw, VPRCL);
1541         adapter->stats.vprch += IXGB_READ_REG(&adapter->hw, VPRCH);
1542         adapter->stats.jprcl += IXGB_READ_REG(&adapter->hw, JPRCL);
1543         adapter->stats.jprch += IXGB_READ_REG(&adapter->hw, JPRCH);
1544         adapter->stats.gorcl += IXGB_READ_REG(&adapter->hw, GORCL);
1545         adapter->stats.gorch += IXGB_READ_REG(&adapter->hw, GORCH);
1546         adapter->stats.torl += IXGB_READ_REG(&adapter->hw, TORL);
1547         adapter->stats.torh += IXGB_READ_REG(&adapter->hw, TORH);
1548         adapter->stats.rnbc += IXGB_READ_REG(&adapter->hw, RNBC);
1549         adapter->stats.ruc += IXGB_READ_REG(&adapter->hw, RUC);
1550         adapter->stats.roc += IXGB_READ_REG(&adapter->hw, ROC);
1551         adapter->stats.rlec += IXGB_READ_REG(&adapter->hw, RLEC);
1552         adapter->stats.crcerrs += IXGB_READ_REG(&adapter->hw, CRCERRS);
1553         adapter->stats.icbc += IXGB_READ_REG(&adapter->hw, ICBC);
1554         adapter->stats.ecbc += IXGB_READ_REG(&adapter->hw, ECBC);
1555         adapter->stats.mpc += IXGB_READ_REG(&adapter->hw, MPC);
1556         adapter->stats.tptl += IXGB_READ_REG(&adapter->hw, TPTL);
1557         adapter->stats.tpth += IXGB_READ_REG(&adapter->hw, TPTH);
1558         adapter->stats.gptcl += IXGB_READ_REG(&adapter->hw, GPTCL);
1559         adapter->stats.gptch += IXGB_READ_REG(&adapter->hw, GPTCH);
1560         adapter->stats.bptcl += IXGB_READ_REG(&adapter->hw, BPTCL);
1561         adapter->stats.bptch += IXGB_READ_REG(&adapter->hw, BPTCH);
1562         adapter->stats.mptcl += IXGB_READ_REG(&adapter->hw, MPTCL);
1563         adapter->stats.mptch += IXGB_READ_REG(&adapter->hw, MPTCH);
1564         adapter->stats.uptcl += IXGB_READ_REG(&adapter->hw, UPTCL);
1565         adapter->stats.uptch += IXGB_READ_REG(&adapter->hw, UPTCH);
1566         adapter->stats.vptcl += IXGB_READ_REG(&adapter->hw, VPTCL);
1567         adapter->stats.vptch += IXGB_READ_REG(&adapter->hw, VPTCH);
1568         adapter->stats.jptcl += IXGB_READ_REG(&adapter->hw, JPTCL);
1569         adapter->stats.jptch += IXGB_READ_REG(&adapter->hw, JPTCH);
1570         adapter->stats.gotcl += IXGB_READ_REG(&adapter->hw, GOTCL);
1571         adapter->stats.gotch += IXGB_READ_REG(&adapter->hw, GOTCH);
1572         adapter->stats.totl += IXGB_READ_REG(&adapter->hw, TOTL);
1573         adapter->stats.toth += IXGB_READ_REG(&adapter->hw, TOTH);
1574         adapter->stats.dc += IXGB_READ_REG(&adapter->hw, DC);
1575         adapter->stats.plt64c += IXGB_READ_REG(&adapter->hw, PLT64C);
1576         adapter->stats.tsctc += IXGB_READ_REG(&adapter->hw, TSCTC);
1577         adapter->stats.tsctfc += IXGB_READ_REG(&adapter->hw, TSCTFC);
1578         adapter->stats.ibic += IXGB_READ_REG(&adapter->hw, IBIC);
1579         adapter->stats.rfc += IXGB_READ_REG(&adapter->hw, RFC);
1580         adapter->stats.lfc += IXGB_READ_REG(&adapter->hw, LFC);
1581         adapter->stats.pfrc += IXGB_READ_REG(&adapter->hw, PFRC);
1582         adapter->stats.pftc += IXGB_READ_REG(&adapter->hw, PFTC);
1583         adapter->stats.mcfrc += IXGB_READ_REG(&adapter->hw, MCFRC);
1584         adapter->stats.mcftc += IXGB_READ_REG(&adapter->hw, MCFTC);
1585         adapter->stats.xonrxc += IXGB_READ_REG(&adapter->hw, XONRXC);
1586         adapter->stats.xontxc += IXGB_READ_REG(&adapter->hw, XONTXC);
1587         adapter->stats.xoffrxc += IXGB_READ_REG(&adapter->hw, XOFFRXC);
1588         adapter->stats.xofftxc += IXGB_READ_REG(&adapter->hw, XOFFTXC);
1589         adapter->stats.rjc += IXGB_READ_REG(&adapter->hw, RJC);
1590
1591         /* Fill out the OS statistics structure */
1592
1593         adapter->net_stats.rx_packets = adapter->stats.gprcl;
1594         adapter->net_stats.tx_packets = adapter->stats.gptcl;
1595         adapter->net_stats.rx_bytes = adapter->stats.gorcl;
1596         adapter->net_stats.tx_bytes = adapter->stats.gotcl;
1597         adapter->net_stats.multicast = adapter->stats.mprcl;
1598         adapter->net_stats.collisions = 0;
1599
1600         /* ignore RLEC as it reports errors for padded (<64bytes) frames
1601          * with a length in the type/len field */
1602         adapter->net_stats.rx_errors =
1603             /* adapter->stats.rnbc + */ adapter->stats.crcerrs +
1604             adapter->stats.ruc +
1605             adapter->stats.roc /*+ adapter->stats.rlec */  +
1606             adapter->stats.icbc +
1607             adapter->stats.ecbc + adapter->stats.mpc;
1608
1609         adapter->net_stats.rx_dropped = adapter->stats.mpc;
1610
1611         /* see above
1612          * adapter->net_stats.rx_length_errors = adapter->stats.rlec;
1613          */
1614
1615         adapter->net_stats.rx_crc_errors = adapter->stats.crcerrs;
1616         adapter->net_stats.rx_fifo_errors = adapter->stats.mpc;
1617         adapter->net_stats.rx_missed_errors = adapter->stats.mpc;
1618         adapter->net_stats.rx_over_errors = adapter->stats.mpc;
1619
1620         adapter->net_stats.tx_errors = 0;
1621         adapter->net_stats.rx_frame_errors = 0;
1622         adapter->net_stats.tx_aborted_errors = 0;
1623         adapter->net_stats.tx_carrier_errors = 0;
1624         adapter->net_stats.tx_fifo_errors = 0;
1625         adapter->net_stats.tx_heartbeat_errors = 0;
1626         adapter->net_stats.tx_window_errors = 0;
1627 }
1628
1629 #define IXGB_MAX_INTR 10
1630 /**
1631  * ixgb_intr - Interrupt Handler
1632  * @irq: interrupt number
1633  * @data: pointer to a network interface device structure
1634  * @pt_regs: CPU registers structure
1635  **/
1636
1637 static irqreturn_t
1638 ixgb_intr(int irq, void *data, struct pt_regs *regs)
1639 {
1640         struct net_device *netdev = data;
1641         struct ixgb_adapter *adapter = netdev->priv;
1642         struct ixgb_hw *hw = &adapter->hw;
1643         uint32_t icr = IXGB_READ_REG(hw, ICR);
1644 #ifndef CONFIG_IXGB_NAPI
1645         unsigned int i;
1646 #endif
1647
1648         if(unlikely(!icr))
1649                 return IRQ_NONE;  /* Not our interrupt */
1650
1651         if(unlikely(icr & (IXGB_INT_RXSEQ | IXGB_INT_LSC))) {
1652                 mod_timer(&adapter->watchdog_timer, jiffies);
1653         }
1654
1655 #ifdef CONFIG_IXGB_NAPI
1656         if(netif_rx_schedule_prep(netdev)) {
1657
1658                 /* Disable interrupts and register for poll. The flush
1659                   of the posted write is intentionally left out.
1660                 */
1661
1662                 atomic_inc(&adapter->irq_sem);
1663                 IXGB_WRITE_REG(&adapter->hw, IMC, ~0);
1664                 __netif_rx_schedule(netdev);
1665         }
1666 #else
1667         /* yes, that is actually a & and it is meant to make sure that
1668          * every pass through this for loop checks both receive and
1669          * transmit queues for completed descriptors, intended to
1670          * avoid starvation issues and assist tx/rx fairness. */
1671         for(i = 0; i < IXGB_MAX_INTR; i++)
1672                 if(!ixgb_clean_rx_irq(adapter) &
1673                    !ixgb_clean_tx_irq(adapter))
1674                         break;
1675 #endif
1676         return IRQ_HANDLED;
1677 }
1678
1679 #ifdef CONFIG_IXGB_NAPI
1680 /**
1681  * ixgb_clean - NAPI Rx polling callback
1682  * @adapter: board private structure
1683  **/
1684
1685 static int
1686 ixgb_clean(struct net_device *netdev, int *budget)
1687 {
1688         struct ixgb_adapter *adapter = netdev->priv;
1689         int work_to_do = min(*budget, netdev->quota);
1690         int tx_cleaned;
1691         int work_done = 0;
1692
1693         tx_cleaned = ixgb_clean_tx_irq(adapter);
1694         ixgb_clean_rx_irq(adapter, &work_done, work_to_do);
1695
1696         *budget -= work_done;
1697         netdev->quota -= work_done;
1698
1699         /* if no Tx and not enough Rx work done, exit the polling mode */
1700         if((!tx_cleaned && (work_done == 0)) || !netif_running(netdev)) {
1701                 netif_rx_complete(netdev);
1702                 ixgb_irq_enable(adapter);
1703                 return 0;
1704         }
1705
1706         return 1;
1707 }
1708 #endif
1709
1710 /**
1711  * ixgb_clean_tx_irq - Reclaim resources after transmit completes
1712  * @adapter: board private structure
1713  **/
1714
1715 static boolean_t
1716 ixgb_clean_tx_irq(struct ixgb_adapter *adapter)
1717 {
1718         struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
1719         struct net_device *netdev = adapter->netdev;
1720         struct ixgb_tx_desc *tx_desc, *eop_desc;
1721         struct ixgb_buffer *buffer_info;
1722         unsigned int i, eop;
1723         boolean_t cleaned = FALSE;
1724
1725         i = tx_ring->next_to_clean;
1726         eop = tx_ring->buffer_info[i].next_to_watch;
1727         eop_desc = IXGB_TX_DESC(*tx_ring, eop);
1728
1729         while(eop_desc->status & IXGB_TX_DESC_STATUS_DD) {
1730
1731                 for(cleaned = FALSE; !cleaned; ) {
1732                         tx_desc = IXGB_TX_DESC(*tx_ring, i);
1733                         buffer_info = &tx_ring->buffer_info[i];
1734
1735                         if (tx_desc->popts
1736                             & (IXGB_TX_DESC_POPTS_TXSM |
1737                                IXGB_TX_DESC_POPTS_IXSM))
1738                                 adapter->hw_csum_tx_good++;
1739
1740                         ixgb_unmap_and_free_tx_resource(adapter, buffer_info);
1741
1742                         *(uint32_t *)&(tx_desc->status) = 0;
1743
1744                         cleaned = (i == eop);
1745                         if(++i == tx_ring->count) i = 0;
1746                 }
1747
1748                 eop = tx_ring->buffer_info[i].next_to_watch;
1749                 eop_desc = IXGB_TX_DESC(*tx_ring, eop);
1750         }
1751
1752         tx_ring->next_to_clean = i;
1753
1754         spin_lock(&adapter->tx_lock);
1755         if(cleaned && netif_queue_stopped(netdev) && netif_carrier_ok(netdev) &&
1756            (IXGB_DESC_UNUSED(tx_ring) > IXGB_TX_QUEUE_WAKE)) {
1757
1758                 netif_wake_queue(netdev);
1759         }
1760         spin_unlock(&adapter->tx_lock);
1761
1762         if(adapter->detect_tx_hung) {
1763                 /* detect a transmit hang in hardware, this serializes the
1764                  * check with the clearing of time_stamp and movement of i */
1765                 adapter->detect_tx_hung = FALSE;
1766                 if(tx_ring->buffer_info[i].dma &&
1767                    time_after(jiffies, tx_ring->buffer_info[i].time_stamp + HZ)
1768                    && !(IXGB_READ_REG(&adapter->hw, STATUS) &
1769                         IXGB_STATUS_TXOFF))
1770                         netif_stop_queue(netdev);
1771         }
1772
1773         return cleaned;
1774 }
1775
1776 /**
1777  * ixgb_rx_checksum - Receive Checksum Offload for 82597.
1778  * @adapter: board private structure
1779  * @rx_desc: receive descriptor
1780  * @sk_buff: socket buffer with received data
1781  **/
1782
1783 static inline void
1784 ixgb_rx_checksum(struct ixgb_adapter *adapter,
1785                  struct ixgb_rx_desc *rx_desc,
1786                  struct sk_buff *skb)
1787 {
1788         /* Ignore Checksum bit is set OR
1789          * TCP Checksum has not been calculated
1790          */
1791         if((rx_desc->status & IXGB_RX_DESC_STATUS_IXSM) ||
1792            (!(rx_desc->status & IXGB_RX_DESC_STATUS_TCPCS))) {
1793                 skb->ip_summed = CHECKSUM_NONE;
1794                 return;
1795         }
1796
1797         /* At this point we know the hardware did the TCP checksum */
1798         /* now look at the TCP checksum error bit */
1799         if(rx_desc->errors & IXGB_RX_DESC_ERRORS_TCPE) {
1800                 /* let the stack verify checksum errors */
1801                 skb->ip_summed = CHECKSUM_NONE;
1802                 adapter->hw_csum_rx_error++;
1803         } else {
1804                 /* TCP checksum is good */
1805                 skb->ip_summed = CHECKSUM_UNNECESSARY;
1806                 adapter->hw_csum_rx_good++;
1807         }
1808 }
1809
1810 /**
1811  * ixgb_clean_rx_irq - Send received data up the network stack,
1812  * @adapter: board private structure
1813  **/
1814
1815 static boolean_t
1816 #ifdef CONFIG_IXGB_NAPI
1817 ixgb_clean_rx_irq(struct ixgb_adapter *adapter, int *work_done, int work_to_do)
1818 #else
1819 ixgb_clean_rx_irq(struct ixgb_adapter *adapter)
1820 #endif
1821 {
1822         struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
1823         struct net_device *netdev = adapter->netdev;
1824         struct pci_dev *pdev = adapter->pdev;
1825         struct ixgb_rx_desc *rx_desc, *next_rxd;
1826         struct ixgb_buffer *buffer_info, *next_buffer, *next2_buffer;
1827         uint32_t length;
1828         unsigned int i, j;
1829         boolean_t cleaned = FALSE;
1830
1831         i = rx_ring->next_to_clean;
1832         rx_desc = IXGB_RX_DESC(*rx_ring, i);
1833         buffer_info = &rx_ring->buffer_info[i];
1834
1835         while(rx_desc->status & IXGB_RX_DESC_STATUS_DD) {
1836                 struct sk_buff *skb, *next_skb;
1837                 u8 status;
1838
1839 #ifdef CONFIG_IXGB_NAPI
1840                 if(*work_done >= work_to_do)
1841                         break;
1842
1843                 (*work_done)++;
1844 #endif
1845                 status = rx_desc->status;
1846                 skb = buffer_info->skb;
1847
1848                 prefetch(skb->data);
1849
1850                 if(++i == rx_ring->count) i = 0;
1851                 next_rxd = IXGB_RX_DESC(*rx_ring, i);
1852                 prefetch(next_rxd);
1853
1854                 if((j = i + 1) == rx_ring->count) j = 0;
1855                 next2_buffer = &rx_ring->buffer_info[j];
1856                 prefetch(next2_buffer);
1857
1858                 next_buffer = &rx_ring->buffer_info[i];
1859                 next_skb = next_buffer->skb;
1860                 prefetch(next_skb);
1861
1862                 cleaned = TRUE;
1863
1864                 pci_unmap_single(pdev,
1865                                  buffer_info->dma,
1866                                  buffer_info->length,
1867                                  PCI_DMA_FROMDEVICE);
1868
1869                 length = le16_to_cpu(rx_desc->length);
1870
1871                 if(unlikely(!(status & IXGB_RX_DESC_STATUS_EOP))) {
1872
1873                         /* All receives must fit into a single buffer */
1874
1875                         IXGB_DBG("Receive packet consumed multiple buffers "
1876                                          "length<%x>\n", length);
1877
1878                         dev_kfree_skb_irq(skb);
1879                         goto rxdesc_done;
1880                 }
1881
1882                 if (unlikely(rx_desc->errors
1883                              & (IXGB_RX_DESC_ERRORS_CE | IXGB_RX_DESC_ERRORS_SE
1884                                 | IXGB_RX_DESC_ERRORS_P |
1885                                 IXGB_RX_DESC_ERRORS_RXE))) {
1886
1887                         dev_kfree_skb_irq(skb);
1888                         goto rxdesc_done;
1889                 }
1890
1891                 /* Good Receive */
1892                 skb_put(skb, length);
1893
1894                 /* Receive Checksum Offload */
1895                 ixgb_rx_checksum(adapter, rx_desc, skb);
1896
1897                 skb->protocol = eth_type_trans(skb, netdev);
1898 #ifdef CONFIG_IXGB_NAPI
1899                 if(adapter->vlgrp && (status & IXGB_RX_DESC_STATUS_VP)) {
1900                         vlan_hwaccel_receive_skb(skb, adapter->vlgrp,
1901                                 le16_to_cpu(rx_desc->special) &
1902                                         IXGB_RX_DESC_SPECIAL_VLAN_MASK);
1903                 } else {
1904                         netif_receive_skb(skb);
1905                 }
1906 #else /* CONFIG_IXGB_NAPI */
1907                 if(adapter->vlgrp && (status & IXGB_RX_DESC_STATUS_VP)) {
1908                         vlan_hwaccel_rx(skb, adapter->vlgrp,
1909                                 le16_to_cpu(rx_desc->special) &
1910                                         IXGB_RX_DESC_SPECIAL_VLAN_MASK);
1911                 } else {
1912                         netif_rx(skb);
1913                 }
1914 #endif /* CONFIG_IXGB_NAPI */
1915                 netdev->last_rx = jiffies;
1916
1917 rxdesc_done:
1918                 /* clean up descriptor, might be written over by hw */
1919                 rx_desc->status = 0;
1920                 buffer_info->skb = NULL;
1921
1922                 /* use prefetched values */
1923                 rx_desc = next_rxd;
1924                 buffer_info = next_buffer;
1925         }
1926
1927         rx_ring->next_to_clean = i;
1928
1929         ixgb_alloc_rx_buffers(adapter);
1930
1931         return cleaned;
1932 }
1933
1934 /**
1935  * ixgb_alloc_rx_buffers - Replace used receive buffers
1936  * @adapter: address of board private structure
1937  **/
1938
1939 static void
1940 ixgb_alloc_rx_buffers(struct ixgb_adapter *adapter)
1941 {
1942         struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
1943         struct net_device *netdev = adapter->netdev;
1944         struct pci_dev *pdev = adapter->pdev;
1945         struct ixgb_rx_desc *rx_desc;
1946         struct ixgb_buffer *buffer_info;
1947         struct sk_buff *skb;
1948         unsigned int i;
1949         int num_group_tail_writes;
1950         long cleancount;
1951
1952         i = rx_ring->next_to_use;
1953         buffer_info = &rx_ring->buffer_info[i];
1954         cleancount = IXGB_DESC_UNUSED(rx_ring);
1955
1956         num_group_tail_writes = IXGB_RX_BUFFER_WRITE;
1957
1958         /* leave three descriptors unused */
1959         while(--cleancount > 2) {
1960                 rx_desc = IXGB_RX_DESC(*rx_ring, i);
1961
1962                 skb = dev_alloc_skb(adapter->rx_buffer_len + NET_IP_ALIGN);
1963
1964                 if(unlikely(!skb)) {
1965                         /* Better luck next round */
1966                         break;
1967                 }
1968
1969                 /* Make buffer alignment 2 beyond a 16 byte boundary
1970                  * this will result in a 16 byte aligned IP header after
1971                  * the 14 byte MAC header is removed
1972                  */
1973                 skb_reserve(skb, NET_IP_ALIGN);
1974
1975                 skb->dev = netdev;
1976
1977                 buffer_info->skb = skb;
1978                 buffer_info->length = adapter->rx_buffer_len;
1979                 buffer_info->dma =
1980                         pci_map_single(pdev,
1981                                    skb->data,
1982                                    adapter->rx_buffer_len,
1983                                    PCI_DMA_FROMDEVICE);
1984
1985                 rx_desc->buff_addr = cpu_to_le64(buffer_info->dma);
1986                 /* guarantee DD bit not set now before h/w gets descriptor
1987                  * this is the rest of the workaround for h/w double
1988                  * writeback. */
1989                 rx_desc->status = 0;
1990
1991                 if((i & ~(num_group_tail_writes- 1)) == i) {
1992                         /* Force memory writes to complete before letting h/w
1993                          * know there are new descriptors to fetch.  (Only
1994                          * applicable for weak-ordered memory model archs,
1995                          * such as IA-64). */
1996                         wmb();
1997
1998                         IXGB_WRITE_REG(&adapter->hw, RDT, i);
1999                 }
2000
2001                 if(++i == rx_ring->count) i = 0;
2002                 buffer_info = &rx_ring->buffer_info[i];
2003         }
2004
2005         rx_ring->next_to_use = i;
2006 }
2007
2008 /**
2009  * ixgb_vlan_rx_register - enables or disables vlan tagging/stripping.
2010  *
2011  * @param netdev network interface device structure
2012  * @param grp indicates to enable or disable tagging/stripping
2013  **/
2014 static void
2015 ixgb_vlan_rx_register(struct net_device *netdev, struct vlan_group *grp)
2016 {
2017         struct ixgb_adapter *adapter = netdev->priv;
2018         uint32_t ctrl, rctl;
2019
2020         ixgb_irq_disable(adapter);
2021         adapter->vlgrp = grp;
2022
2023         if(grp) {
2024                 /* enable VLAN tag insert/strip */
2025                 ctrl = IXGB_READ_REG(&adapter->hw, CTRL0);
2026                 ctrl |= IXGB_CTRL0_VME;
2027                 IXGB_WRITE_REG(&adapter->hw, CTRL0, ctrl);
2028
2029                 /* enable VLAN receive filtering */
2030
2031                 rctl = IXGB_READ_REG(&adapter->hw, RCTL);
2032                 rctl |= IXGB_RCTL_VFE;
2033                 rctl &= ~IXGB_RCTL_CFIEN;
2034                 IXGB_WRITE_REG(&adapter->hw, RCTL, rctl);
2035         } else {
2036                 /* disable VLAN tag insert/strip */
2037
2038                 ctrl = IXGB_READ_REG(&adapter->hw, CTRL0);
2039                 ctrl &= ~IXGB_CTRL0_VME;
2040                 IXGB_WRITE_REG(&adapter->hw, CTRL0, ctrl);
2041
2042                 /* disable VLAN filtering */
2043
2044                 rctl = IXGB_READ_REG(&adapter->hw, RCTL);
2045                 rctl &= ~IXGB_RCTL_VFE;
2046                 IXGB_WRITE_REG(&adapter->hw, RCTL, rctl);
2047         }
2048
2049         ixgb_irq_enable(adapter);
2050 }
2051
2052 static void
2053 ixgb_vlan_rx_add_vid(struct net_device *netdev, uint16_t vid)
2054 {
2055         struct ixgb_adapter *adapter = netdev->priv;
2056         uint32_t vfta, index;
2057
2058         /* add VID to filter table */
2059
2060         index = (vid >> 5) & 0x7F;
2061         vfta = IXGB_READ_REG_ARRAY(&adapter->hw, VFTA, index);
2062         vfta |= (1 << (vid & 0x1F));
2063         ixgb_write_vfta(&adapter->hw, index, vfta);
2064 }
2065
2066 static void
2067 ixgb_vlan_rx_kill_vid(struct net_device *netdev, uint16_t vid)
2068 {
2069         struct ixgb_adapter *adapter = netdev->priv;
2070         uint32_t vfta, index;
2071
2072         ixgb_irq_disable(adapter);
2073
2074         if(adapter->vlgrp)
2075                 adapter->vlgrp->vlan_devices[vid] = NULL;
2076
2077         ixgb_irq_enable(adapter);
2078
2079         /* remove VID from filter table*/
2080
2081         index = (vid >> 5) & 0x7F;
2082         vfta = IXGB_READ_REG_ARRAY(&adapter->hw, VFTA, index);
2083         vfta &= ~(1 << (vid & 0x1F));
2084         ixgb_write_vfta(&adapter->hw, index, vfta);
2085 }
2086
2087 static void
2088 ixgb_restore_vlan(struct ixgb_adapter *adapter)
2089 {
2090         ixgb_vlan_rx_register(adapter->netdev, adapter->vlgrp);
2091
2092         if(adapter->vlgrp) {
2093                 uint16_t vid;
2094                 for(vid = 0; vid < VLAN_GROUP_ARRAY_LEN; vid++) {
2095                         if(!adapter->vlgrp->vlan_devices[vid])
2096                                 continue;
2097                         ixgb_vlan_rx_add_vid(adapter->netdev, vid);
2098                 }
2099         }
2100 }
2101
2102 #ifdef CONFIG_NET_POLL_CONTROLLER
2103 /*
2104  * Polling 'interrupt' - used by things like netconsole to send skbs
2105  * without having to re-enable interrupts. It's not called while
2106  * the interrupt routine is executing.
2107  */
2108
2109 static void ixgb_netpoll(struct net_device *dev)
2110 {
2111         struct ixgb_adapter *adapter = dev->priv;
2112
2113         disable_irq(adapter->pdev->irq);
2114         ixgb_intr(adapter->pdev->irq, dev, NULL);
2115         enable_irq(adapter->pdev->irq);
2116 }
2117 #endif
2118
2119 /* ixgb_main.c */