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
  51 #define DRV_VERSION "1.0.95-k2"DRIVERNAPI
  52 char ixgb_driver_version[] = DRV_VERSION;
  53 char ixgb_copyright[] = "Copyright (c) 1999-2005 Intel Corporation.";
  54
  55 /* ixgb_pci_tbl - PCI Device ID Table
  56  *
  57  * Wildcard entries (PCI_ANY_ID) should come last
  58  * Last entry must be all 0s
  59  *
  60  * { Vendor ID, Device ID, SubVendor ID, SubDevice ID,
  61  *   Class, Class Mask, private data (not used) }
  62  */
  63 static struct pci_device_id ixgb_pci_tbl[] = {
  64         {INTEL_VENDOR_ID, IXGB_DEVICE_ID_82597EX,
  65          PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
  66         {INTEL_VENDOR_ID, IXGB_DEVICE_ID_82597EX_SR,
  67          PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
  68         {INTEL_VENDOR_ID, IXGB_DEVICE_ID_82597EX_LR,
  69          PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
  70
  71         /* required last entry */
  72         {0,}
  73 };
  74
  75 MODULE_DEVICE_TABLE(pci, ixgb_pci_tbl);
  76
  77 /* Local Function Prototypes */
  78
  79 int ixgb_up(struct ixgb_adapter *adapter);
  80 void ixgb_down(struct ixgb_adapter *adapter, boolean_t kill_watchdog);
  81 void ixgb_reset(struct ixgb_adapter *adapter);
  82 int ixgb_setup_tx_resources(struct ixgb_adapter *adapter);
  83 int ixgb_setup_rx_resources(struct ixgb_adapter *adapter);
  84 void ixgb_free_tx_resources(struct ixgb_adapter *adapter);
  85 void ixgb_free_rx_resources(struct ixgb_adapter *adapter);
  86 void ixgb_update_stats(struct ixgb_adapter *adapter);
  87
  88 static int ixgb_init_module(void);
  89 static void ixgb_exit_module(void);
  90 static int ixgb_probe(struct pci_dev *pdev, const struct pci_device_id *ent);
  91 static void __devexit ixgb_remove(struct pci_dev *pdev);
  92 static int ixgb_sw_init(struct ixgb_adapter *adapter);
  93 static int ixgb_open(struct net_device *netdev);
  94 static int ixgb_close(struct net_device *netdev);
  95 static void ixgb_configure_tx(struct ixgb_adapter *adapter);
  96 static void ixgb_configure_rx(struct ixgb_adapter *adapter);
  97 static void ixgb_setup_rctl(struct ixgb_adapter *adapter);
  98 static void ixgb_clean_tx_ring(struct ixgb_adapter *adapter);
  99 static void ixgb_clean_rx_ring(struct ixgb_adapter *adapter);
 100 static void ixgb_set_multi(struct net_device *netdev);
 101 static void ixgb_watchdog(unsigned long data);
 102 static int ixgb_xmit_frame(struct sk_buff *skb, struct net_device *netdev);
 103 static struct net_device_stats *ixgb_get_stats(struct net_device *netdev);
 104 static int ixgb_change_mtu(struct net_device *netdev, int new_mtu);
 105 static int ixgb_set_mac(struct net_device *netdev, void *p);
 106 static irqreturn_t ixgb_intr(int irq, void *data, struct pt_regs *regs);
 107 static boolean_t ixgb_clean_tx_irq(struct ixgb_adapter *adapter);
 108
 109 #ifdef CONFIG_IXGB_NAPI
 110 static int ixgb_clean(struct net_device *netdev, int *budget);
 111 static boolean_t ixgb_clean_rx_irq(struct ixgb_adapter *adapter,
 112                                    int *work_done, int work_to_do);
 113 #else
 114 static boolean_t ixgb_clean_rx_irq(struct ixgb_adapter *adapter);
 115 #endif
 116 static void ixgb_alloc_rx_buffers(struct ixgb_adapter *adapter);
 117 void ixgb_set_ethtool_ops(struct net_device *netdev);
 118 static void ixgb_tx_timeout(struct net_device *dev);
 119 static void ixgb_tx_timeout_task(struct net_device *dev);
 120 static void ixgb_vlan_rx_register(struct net_device *netdev,
 121                                   struct vlan_group *grp);
 122 static void ixgb_vlan_rx_add_vid(struct net_device *netdev, uint16_t vid);
 123 static void ixgb_vlan_rx_kill_vid(struct net_device *netdev, uint16_t vid);
 124 static void ixgb_restore_vlan(struct ixgb_adapter *adapter);
 125
 126 #ifdef CONFIG_NET_POLL_CONTROLLER
 127 /* for netdump / net console */
 128 static void ixgb_netpoll(struct net_device *dev);
 129 #endif
 130
 131 /* Exported from other modules */
 132
 133 extern void ixgb_check_options(struct ixgb_adapter *adapter);
 134
 135 static struct pci_driver ixgb_driver = {
 136         .name     = ixgb_driver_name,
 137         .id_table = ixgb_pci_tbl,
 138         .probe    = ixgb_probe,
 139         .remove   = __devexit_p(ixgb_remove),
 140 };
 141
 142 MODULE_AUTHOR("Intel Corporation, <linux.nics@intel.com>");
 143 MODULE_DESCRIPTION("Intel(R) PRO/10GbE Network Driver");
 144 MODULE_LICENSE("GPL");
 145 MODULE_VERSION(DRV_VERSION);
 146
 147 /* some defines for controlling descriptor fetches in h/w */
 148 #define RXDCTL_PTHRESH_DEFAULT 128      /* chip considers prefech below this */
 149 #define RXDCTL_HTHRESH_DEFAULT 16       /* chip will only prefetch if tail is
 150                                            pushed this many descriptors from head */
 151 #define RXDCTL_WTHRESH_DEFAULT 16       /* chip writes back at this many or RXT0 */
 152
 153 /**
 154  * ixgb_init_module - Driver Registration Routine
 155  *
 156  * ixgb_init_module is the first routine called when the driver is
 157  * loaded. All it does is register with the PCI subsystem.
 158  **/
 159
 160 static int __init
 161 ixgb_init_module(void)
 162 {
 163         printk(KERN_INFO "%s - version %s\n",
 164                ixgb_driver_string, ixgb_driver_version);
 165
 166         printk(KERN_INFO "%s\n", ixgb_copyright);
 167
 168         return pci_module_init(&ixgb_driver);
 169 }
 170
 171 module_init(ixgb_init_module);
 172
 173 /**
 174  * ixgb_exit_module - Driver Exit Cleanup Routine
 175  *
 176  * ixgb_exit_module is called just before the driver is removed
 177  * from memory.
 178  **/
 179
 180 static void __exit
 181 ixgb_exit_module(void)
 182 {
 183         pci_unregister_driver(&ixgb_driver);
 184 }
 185
 186 module_exit(ixgb_exit_module);
 187
 188 /**
 189  * ixgb_irq_disable - Mask off interrupt generation on the NIC
 190  * @adapter: board private structure
 191  **/
 192
 193 static inline void
 194 ixgb_irq_disable(struct ixgb_adapter *adapter)
 195 {
 196         atomic_inc(&adapter->irq_sem);
 197         IXGB_WRITE_REG(&adapter->hw, IMC, ~0);
 198         IXGB_WRITE_FLUSH(&adapter->hw);
 199         synchronize_irq(adapter->pdev->irq);
 200 }
 201
 202 /**
 203  * ixgb_irq_enable - Enable default interrupt generation settings
 204  * @adapter: board private structure
 205  **/
 206
 207 static inline void
 208 ixgb_irq_enable(struct ixgb_adapter *adapter)
 209 {
 210         if(atomic_dec_and_test(&adapter->irq_sem)) {
 211                 IXGB_WRITE_REG(&adapter->hw, IMS,
 212                                IXGB_INT_RXT0 | IXGB_INT_RXDMT0 | IXGB_INT_TXDW |
 213                                IXGB_INT_LSC);
 214                 IXGB_WRITE_FLUSH(&adapter->hw);
 215         }
 216 }
 217
 218 int
 219 ixgb_up(struct ixgb_adapter *adapter)
 220 {
 221         struct net_device *netdev = adapter->netdev;
 222         int err;
 223         int max_frame = netdev->mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;
 224         struct ixgb_hw *hw = &adapter->hw;
 225
 226         /* hardware has been reset, we need to reload some things */
 227
 228         ixgb_set_multi(netdev);
 229
 230         ixgb_restore_vlan(adapter);
 231
 232         ixgb_configure_tx(adapter);
 233         ixgb_setup_rctl(adapter);
 234         ixgb_configure_rx(adapter);
 235         ixgb_alloc_rx_buffers(adapter);
 236
 237 #ifdef CONFIG_PCI_MSI
 238         {
 239         boolean_t pcix = (IXGB_READ_REG(&adapter->hw, STATUS) &
 240                                                   IXGB_STATUS_PCIX_MODE) ? TRUE : FALSE;
 241         adapter->have_msi = TRUE;
 242
 243         if (!pcix)
 244            adapter->have_msi = FALSE;
 245         else if((err = pci_enable_msi(adapter->pdev))) {
 246                 printk (KERN_ERR
 247                  "Unable to allocate MSI interrupt Error: %d\n", err);
 248                 adapter->have_msi = FALSE;
 249                 /* proceed to try to request regular interrupt */
 250         }
 251         }
 252
 253 #endif
 254         if((err = request_irq(adapter->pdev->irq, &ixgb_intr,
 255                                   SA_SHIRQ | SA_SAMPLE_RANDOM,
 256                                   netdev->name, netdev)))
 257                 return err;
 258
 259         /* disable interrupts and get the hardware into a known state */
 260         IXGB_WRITE_REG(&adapter->hw, IMC, 0xffffffff);
 261
 262         if((hw->max_frame_size != max_frame) ||
 263                 (hw->max_frame_size !=
 264                 (IXGB_READ_REG(hw, MFS) >> IXGB_MFS_SHIFT))) {
 265
 266                 hw->max_frame_size = max_frame;
 267
 268                 IXGB_WRITE_REG(hw, MFS, hw->max_frame_size << IXGB_MFS_SHIFT);
 269
 270                 if(hw->max_frame_size >
 271                    IXGB_MAX_ENET_FRAME_SIZE_WITHOUT_FCS + ENET_FCS_LENGTH) {
 272                         uint32_t ctrl0 = IXGB_READ_REG(hw, CTRL0);
 273
 274                         if(!(ctrl0 & IXGB_CTRL0_JFE)) {
 275                                 ctrl0 |= IXGB_CTRL0_JFE;
 276                                 IXGB_WRITE_REG(hw, CTRL0, ctrl0);
 277                         }
 278                 }
 279         }
 280
 281         mod_timer(&adapter->watchdog_timer, jiffies);
 282         ixgb_irq_enable(adapter);
 283
 284 #ifdef CONFIG_IXGB_NAPI
 285         netif_poll_enable(netdev);
 286 #endif
 287         return 0;
 288 }
 289
 290 void
 291 ixgb_down(struct ixgb_adapter *adapter, boolean_t kill_watchdog)
 292 {
 293         struct net_device *netdev = adapter->netdev;
 294
 295         ixgb_irq_disable(adapter);
 296         free_irq(adapter->pdev->irq, netdev);
 297 #ifdef CONFIG_PCI_MSI
 298         if(adapter->have_msi == TRUE)
 299                 pci_disable_msi(adapter->pdev);
 300
 301 #endif
 302         if(kill_watchdog)
 303                 del_timer_sync(&adapter->watchdog_timer);
 304 #ifdef CONFIG_IXGB_NAPI
 305         netif_poll_disable(netdev);
 306 #endif
 307         adapter->link_speed = 0;
 308         adapter->link_duplex = 0;
 309         netif_carrier_off(netdev);
 310         netif_stop_queue(netdev);
 311
 312         ixgb_reset(adapter);
 313         ixgb_clean_tx_ring(adapter);
 314         ixgb_clean_rx_ring(adapter);
 315 }
 316
 317 void
 318 ixgb_reset(struct ixgb_adapter *adapter)
 319 {
 320
 321         ixgb_adapter_stop(&adapter->hw);
 322         if(!ixgb_init_hw(&adapter->hw))
 323                 IXGB_DBG("ixgb_init_hw failed.\n");
 324 }
 325
 326 /**
 327  * ixgb_probe - Device Initialization Routine
 328  * @pdev: PCI device information struct
 329  * @ent: entry in ixgb_pci_tbl
 330  *
 331  * Returns 0 on success, negative on failure
 332  *
 333  * ixgb_probe initializes an adapter identified by a pci_dev structure.
 334  * The OS initialization, configuring of the adapter private structure,
 335  * and a hardware reset occur.
 336  **/
 337
 338 static int __devinit
 339 ixgb_probe(struct pci_dev *pdev,
 340                 const struct pci_device_id *ent)
 341 {
 342         struct net_device *netdev = NULL;
 343         struct ixgb_adapter *adapter;
 344         static int cards_found = 0;
 345         unsigned long mmio_start;
 346         int mmio_len;
 347         int pci_using_dac;
 348         int i;
 349         int err;
 350
 351         if((err = pci_enable_device(pdev)))
 352                 return err;
 353
 354         if(!(err = pci_set_dma_mask(pdev, DMA_64BIT_MASK))) {
 355                 pci_using_dac = 1;
 356         } else {
 357                 if((err = pci_set_dma_mask(pdev, DMA_32BIT_MASK))) {
 358                         IXGB_ERR("No usable DMA configuration, aborting\n");
 359                         return err;
 360                 }
 361                 pci_using_dac = 0;
 362         }
 363
 364         if((err = pci_request_regions(pdev, ixgb_driver_name)))
 365                 return err;
 366
 367         pci_set_master(pdev);
 368
 369         netdev = alloc_etherdev(sizeof(struct ixgb_adapter));
 370         if(!netdev) {
 371                 err = -ENOMEM;
 372                 goto err_alloc_etherdev;
 373         }
 374
 375         SET_MODULE_OWNER(netdev);
 376         SET_NETDEV_DEV(netdev, &pdev->dev);
 377
 378         pci_set_drvdata(pdev, netdev);
 379         adapter = netdev->priv;
 380         adapter->netdev = netdev;
 381         adapter->pdev = pdev;
 382         adapter->hw.back = adapter;
 383
 384         mmio_start = pci_resource_start(pdev, BAR_0);
 385         mmio_len = pci_resource_len(pdev, BAR_0);
 386
 387         adapter->hw.hw_addr = ioremap(mmio_start, mmio_len);
 388         if(!adapter->hw.hw_addr) {
 389                 err = -EIO;
 390                 goto err_ioremap;
 391         }
 392
 393         for(i = BAR_1; i <= BAR_5; i++) {
 394                 if(pci_resource_len(pdev, i) == 0)
 395                         continue;
 396                 if(pci_resource_flags(pdev, i) & IORESOURCE_IO) {
 397                         adapter->hw.io_base = pci_resource_start(pdev, i);
 398                         break;
 399                 }
 400         }
 401
 402         netdev->open = &ixgb_open;
 403         netdev->stop = &ixgb_close;
 404         netdev->hard_start_xmit = &ixgb_xmit_frame;
 405         netdev->get_stats = &ixgb_get_stats;
 406         netdev->set_multicast_list = &ixgb_set_multi;
 407         netdev->set_mac_address = &ixgb_set_mac;
 408         netdev->change_mtu = &ixgb_change_mtu;
 409         ixgb_set_ethtool_ops(netdev);
 410         netdev->tx_timeout = &ixgb_tx_timeout;
 411         netdev->watchdog_timeo = HZ;
 412 #ifdef CONFIG_IXGB_NAPI
 413         netdev->poll = &ixgb_clean;
 414         netdev->weight = 64;
 415 #endif
 416         netdev->vlan_rx_register = ixgb_vlan_rx_register;
 417         netdev->vlan_rx_add_vid = ixgb_vlan_rx_add_vid;
 418         netdev->vlan_rx_kill_vid = ixgb_vlan_rx_kill_vid;
 419 #ifdef CONFIG_NET_POLL_CONTROLLER
 420         netdev->poll_controller = ixgb_netpoll;
 421 #endif
 422
 423         netdev->mem_start = mmio_start;
 424         netdev->mem_end = mmio_start + mmio_len;
 425         netdev->base_addr = adapter->hw.io_base;
 426
 427         adapter->bd_number = cards_found;
 428         adapter->link_speed = 0;
 429         adapter->link_duplex = 0;
 430
 431         /* setup the private structure */
 432
 433         if((err = ixgb_sw_init(adapter)))
 434                 goto err_sw_init;
 435
 436         netdev->features = NETIF_F_SG |
 437                            NETIF_F_HW_CSUM |
 438                            NETIF_F_HW_VLAN_TX |
 439                            NETIF_F_HW_VLAN_RX |
 440                            NETIF_F_HW_VLAN_FILTER;
 441 #ifdef NETIF_F_TSO
 442         netdev->features |= NETIF_F_TSO;
 443 #endif
 444
 445         if(pci_using_dac)
 446                 netdev->features |= NETIF_F_HIGHDMA;
 447
 448         /* make sure the EEPROM is good */
 449
 450         if(!ixgb_validate_eeprom_checksum(&adapter->hw)) {
 451                 printk(KERN_ERR "The EEPROM Checksum Is Not Valid\n");
 452                 err = -EIO;
 453                 goto err_eeprom;
 454         }
 455
 456         ixgb_get_ee_mac_addr(&adapter->hw, netdev->dev_addr);
 457
 458         if(!is_valid_ether_addr(netdev->dev_addr)) {
 459                 err = -EIO;
 460                 goto err_eeprom;
 461         }
 462
 463         adapter->part_num = ixgb_get_ee_pba_number(&adapter->hw);
 464
 465         init_timer(&adapter->watchdog_timer);
 466         adapter->watchdog_timer.function = &ixgb_watchdog;
 467         adapter->watchdog_timer.data = (unsigned long)adapter;
 468
 469         INIT_WORK(&adapter->tx_timeout_task,
 470                   (void (*)(void *))ixgb_tx_timeout_task, netdev);
 471
 472         if((err = register_netdev(netdev)))
 473                 goto err_register;
 474
 475         /* we're going to reset, so assume we have no link for now */
 476
 477         netif_carrier_off(netdev);
 478         netif_stop_queue(netdev);
 479
 480         printk(KERN_INFO "%s: Intel(R) PRO/10GbE Network Connection\n",
 481                    netdev->name);
 482         ixgb_check_options(adapter);
 483         /* reset the hardware with the new settings */
 484
 485         ixgb_reset(adapter);
 486
 487         cards_found++;
 488         return 0;
 489
 490 err_register:
 491 err_sw_init:
 492 err_eeprom:
 493         iounmap(adapter->hw.hw_addr);
 494 err_ioremap:
 495         free_netdev(netdev);
 496 err_alloc_etherdev:
 497         pci_release_regions(pdev);
 498         return err;
 499 }
 500
 501 /**
 502  * ixgb_remove - Device Removal Routine
 503  * @pdev: PCI device information struct
 504  *
 505  * ixgb_remove is called by the PCI subsystem to alert the driver
 506  * that it should release a PCI device.  The could be caused by a
 507  * Hot-Plug event, or because the driver is going to be removed from
 508  * memory.
 509  **/
 510
 511 static void __devexit
 512 ixgb_remove(struct pci_dev *pdev)
 513 {
 514         struct net_device *netdev = pci_get_drvdata(pdev);
 515         struct ixgb_adapter *adapter = netdev->priv;
 516
 517         unregister_netdev(netdev);
 518
 519         iounmap(adapter->hw.hw_addr);
 520         pci_release_regions(pdev);
 521
 522         free_netdev(netdev);
 523 }
 524
 525 /**
 526  * ixgb_sw_init - Initialize general software structures (struct ixgb_adapter)
 527  * @adapter: board private structure to initialize
 528  *
 529  * ixgb_sw_init initializes the Adapter private data structure.
 530  * Fields are initialized based on PCI device information and
 531  * OS network device settings (MTU size).
 532  **/
 533
 534 static int __devinit
 535 ixgb_sw_init(struct ixgb_adapter *adapter)
 536 {
 537         struct ixgb_hw *hw = &adapter->hw;
 538         struct net_device *netdev = adapter->netdev;
 539         struct pci_dev *pdev = adapter->pdev;
 540
 541         /* PCI config space info */
 542
 543         hw->vendor_id = pdev->vendor;
 544         hw->device_id = pdev->device;
 545         hw->subsystem_vendor_id = pdev->subsystem_vendor;
 546         hw->subsystem_id = pdev->subsystem_device;
 547
 548         adapter->rx_buffer_len = IXGB_RXBUFFER_2048;
 549
 550         hw->max_frame_size = netdev->mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;
 551
 552         if((hw->device_id == IXGB_DEVICE_ID_82597EX)
 553            ||(hw->device_id == IXGB_DEVICE_ID_82597EX_LR)
 554            ||(hw->device_id == IXGB_DEVICE_ID_82597EX_SR))
 555                         hw->mac_type = ixgb_82597;
 556         else {
 557                 /* should never have loaded on this device */
 558                 printk(KERN_ERR "ixgb: unsupported device id\n");
 559         }
 560
 561         /* enable flow control to be programmed */
 562         hw->fc.send_xon = 1;
 563
 564         atomic_set(&adapter->irq_sem, 1);
 565         spin_lock_init(&adapter->tx_lock);
 566
 567         return 0;
 568 }
 569
 570 /**
 571  * ixgb_open - Called when a network interface is made active
 572  * @netdev: network interface device structure
 573  *
 574  * Returns 0 on success, negative value on failure
 575  *
 576  * The open entry point is called when a network interface is made
 577  * active by the system (IFF_UP).  At this point all resources needed
 578  * for transmit and receive operations are allocated, the interrupt
 579  * handler is registered with the OS, the watchdog timer is started,
 580  * and the stack is notified that the interface is ready.
 581  **/
 582
 583 static int
 584 ixgb_open(struct net_device *netdev)
 585 {
 586         struct ixgb_adapter *adapter = netdev->priv;
 587         int err;
 588
 589         /* allocate transmit descriptors */
 590
 591         if((err = ixgb_setup_tx_resources(adapter)))
 592                 goto err_setup_tx;
 593
 594         /* allocate receive descriptors */
 595
 596         if((err = ixgb_setup_rx_resources(adapter)))
 597                 goto err_setup_rx;
 598
 599         if((err = ixgb_up(adapter)))
 600                 goto err_up;
 601
 602         return 0;
 603
 604 err_up:
 605         ixgb_free_rx_resources(adapter);
 606 err_setup_rx:
 607         ixgb_free_tx_resources(adapter);
 608 err_setup_tx:
 609         ixgb_reset(adapter);
 610
 611         return err;
 612 }
 613
 614 /**
 615  * ixgb_close - Disables a network interface
 616  * @netdev: network interface device structure
 617  *
 618  * Returns 0, this is not allowed to fail
 619  *
 620  * The close entry point is called when an interface is de-activated
 621  * by the OS.  The hardware is still under the drivers control, but
 622  * needs to be disabled.  A global MAC reset is issued to stop the
 623  * hardware, and all transmit and receive resources are freed.
 624  **/
 625
 626 static int
 627 ixgb_close(struct net_device *netdev)
 628 {
 629         struct ixgb_adapter *adapter = netdev->priv;
 630
 631         ixgb_down(adapter, TRUE);
 632
 633         ixgb_free_tx_resources(adapter);
 634         ixgb_free_rx_resources(adapter);
 635
 636         return 0;
 637 }
 638
 639 /**
 640  * ixgb_setup_tx_resources - allocate Tx resources (Descriptors)
 641  * @adapter: board private structure
 642  *
 643  * Return 0 on success, negative on failure
 644  **/
 645
 646 int
 647 ixgb_setup_tx_resources(struct ixgb_adapter *adapter)
 648 {
 649         struct ixgb_desc_ring *txdr = &adapter->tx_ring;
 650         struct pci_dev *pdev = adapter->pdev;
 651         int size;
 652
 653         size = sizeof(struct ixgb_buffer) * txdr->count;
 654         txdr->buffer_info = vmalloc(size);
 655         if(!txdr->buffer_info) {
 656                 return -ENOMEM;
 657         }
 658         memset(txdr->buffer_info, 0, size);
 659
 660         /* round up to nearest 4K */
 661
 662         txdr->size = txdr->count * sizeof(struct ixgb_tx_desc);
 663         IXGB_ROUNDUP(txdr->size, 4096);
 664
 665         txdr->desc = pci_alloc_consistent(pdev, txdr->size, &txdr->dma);
 666         if(!txdr->desc) {
 667                 vfree(txdr->buffer_info);
 668                 return -ENOMEM;
 669         }
 670         memset(txdr->desc, 0, txdr->size);
 671
 672         txdr->next_to_use = 0;
 673         txdr->next_to_clean = 0;
 674
 675         return 0;
 676 }
 677
 678 /**
 679  * ixgb_configure_tx - Configure 82597 Transmit Unit after Reset.
 680  * @adapter: board private structure
 681  *
 682  * Configure the Tx unit of the MAC after a reset.
 683  **/
 684
 685 static void
 686 ixgb_configure_tx(struct ixgb_adapter *adapter)
 687 {
 688         uint64_t tdba = adapter->tx_ring.dma;
 689         uint32_t tdlen = adapter->tx_ring.count * sizeof(struct ixgb_tx_desc);
 690         uint32_t tctl;
 691         struct ixgb_hw *hw = &adapter->hw;
 692
 693         /* Setup the Base and Length of the Tx Descriptor Ring
 694          * tx_ring.dma can be either a 32 or 64 bit value
 695          */
 696
 697         IXGB_WRITE_REG(hw, TDBAL, (tdba & 0x00000000ffffffffULL));
 698         IXGB_WRITE_REG(hw, TDBAH, (tdba >> 32));
 699
 700         IXGB_WRITE_REG(hw, TDLEN, tdlen);
 701
 702         /* Setup the HW Tx Head and Tail descriptor pointers */
 703
 704         IXGB_WRITE_REG(hw, TDH, 0);
 705         IXGB_WRITE_REG(hw, TDT, 0);
 706
 707         /* don't set up txdctl, it induces performance problems if configured
 708          * incorrectly */
 709         /* Set the Tx Interrupt Delay register */
 710
 711         IXGB_WRITE_REG(hw, TIDV, adapter->tx_int_delay);
 712
 713         /* Program the Transmit Control Register */
 714
 715         tctl = IXGB_TCTL_TCE | IXGB_TCTL_TXEN | IXGB_TCTL_TPDE;
 716         IXGB_WRITE_REG(hw, TCTL, tctl);
 717
 718         /* Setup Transmit Descriptor Settings for this adapter */
 719         adapter->tx_cmd_type =
 720                 IXGB_TX_DESC_TYPE
 721                 | (adapter->tx_int_delay_enable ? IXGB_TX_DESC_CMD_IDE : 0);
 722 }
 723
 724 /**
 725  * ixgb_setup_rx_resources - allocate Rx resources (Descriptors)
 726  * @adapter: board private structure
 727  *
 728  * Returns 0 on success, negative on failure
 729  **/
 730
 731 int
 732 ixgb_setup_rx_resources(struct ixgb_adapter *adapter)
 733 {
 734         struct ixgb_desc_ring *rxdr = &adapter->rx_ring;
 735         struct pci_dev *pdev = adapter->pdev;
 736         int size;
 737
 738         size = sizeof(struct ixgb_buffer) * rxdr->count;
 739         rxdr->buffer_info = vmalloc(size);
 740         if(!rxdr->buffer_info) {
 741                 return -ENOMEM;
 742         }
 743         memset(rxdr->buffer_info, 0, size);
 744
 745         /* Round up to nearest 4K */
 746
 747         rxdr->size = rxdr->count * sizeof(struct ixgb_rx_desc);
 748         IXGB_ROUNDUP(rxdr->size, 4096);
 749
 750         rxdr->desc = pci_alloc_consistent(pdev, rxdr->size, &rxdr->dma);
 751
 752         if(!rxdr->desc) {
 753                 vfree(rxdr->buffer_info);
 754                 return -ENOMEM;
 755         }
 756         memset(rxdr->desc, 0, rxdr->size);
 757
 758         rxdr->next_to_clean = 0;
 759         rxdr->next_to_use = 0;
 760
 761         return 0;
 762 }
 763
 764 /**
 765  * ixgb_setup_rctl - configure the receive control register
 766  * @adapter: Board private structure
 767  **/
 768
 769 static void
 770 ixgb_setup_rctl(struct ixgb_adapter *adapter)
 771 {
 772         uint32_t rctl;
 773
 774         rctl = IXGB_READ_REG(&adapter->hw, RCTL);
 775
 776         rctl &= ~(3 << IXGB_RCTL_MO_SHIFT);
 777
 778         rctl |=
 779                 IXGB_RCTL_BAM | IXGB_RCTL_RDMTS_1_2 |
 780                 IXGB_RCTL_RXEN | IXGB_RCTL_CFF |
 781                 (adapter->hw.mc_filter_type << IXGB_RCTL_MO_SHIFT);
 782
 783         rctl |= IXGB_RCTL_SECRC;
 784
 785         switch (adapter->rx_buffer_len) {
 786         case IXGB_RXBUFFER_2048:
 787         default:
 788                 rctl |= IXGB_RCTL_BSIZE_2048;
 789                 break;
 790         case IXGB_RXBUFFER_4096:
 791                 rctl |= IXGB_RCTL_BSIZE_4096;
 792                 break;
 793         case IXGB_RXBUFFER_8192:
 794                 rctl |= IXGB_RCTL_BSIZE_8192;
 795                 break;
 796         case IXGB_RXBUFFER_16384:
 797                 rctl |= IXGB_RCTL_BSIZE_16384;
 798                 break;
 799         }
 800
 801         IXGB_WRITE_REG(&adapter->hw, RCTL, rctl);
 802 }
 803
 804 /**
 805  * ixgb_configure_rx - Configure 82597 Receive Unit after Reset.
 806  * @adapter: board private structure
 807  *
 808  * Configure the Rx unit of the MAC after a reset.
 809  **/
 810
 811 static void
 812 ixgb_configure_rx(struct ixgb_adapter *adapter)
 813 {
 814         uint64_t rdba = adapter->rx_ring.dma;
 815         uint32_t rdlen = adapter->rx_ring.count * sizeof(struct ixgb_rx_desc);
 816         struct ixgb_hw *hw = &adapter->hw;
 817         uint32_t rctl;
 818         uint32_t rxcsum;
 819         uint32_t rxdctl;
 820
 821         /* make sure receives are disabled while setting up the descriptors */
 822
 823         rctl = IXGB_READ_REG(hw, RCTL);
 824         IXGB_WRITE_REG(hw, RCTL, rctl & ~IXGB_RCTL_RXEN);
 825
 826         /* set the Receive Delay Timer Register */
 827
 828         IXGB_WRITE_REG(hw, RDTR, adapter->rx_int_delay);
 829
 830         /* Setup the Base and Length of the Rx Descriptor Ring */
 831
 832         IXGB_WRITE_REG(hw, RDBAL, (rdba & 0x00000000ffffffffULL));
 833         IXGB_WRITE_REG(hw, RDBAH, (rdba >> 32));
 834
 835         IXGB_WRITE_REG(hw, RDLEN, rdlen);
 836
 837         /* Setup the HW Rx Head and Tail Descriptor Pointers */
 838         IXGB_WRITE_REG(hw, RDH, 0);
 839         IXGB_WRITE_REG(hw, RDT, 0);
 840
 841         /* set up pre-fetching of receive buffers so we get some before we
 842          * run out (default hardware behavior is to run out before fetching
 843          * more).  This sets up to fetch if HTHRESH rx descriptors are avail
 844          * and the descriptors in hw cache are below PTHRESH.  This avoids
 845          * the hardware behavior of fetching <=512 descriptors in a single
 846          * burst that pre-empts all other activity, usually causing fifo
 847          * overflows. */
 848         /* use WTHRESH to burst write 16 descriptors or burst when RXT0 */
 849         rxdctl = RXDCTL_WTHRESH_DEFAULT << IXGB_RXDCTL_WTHRESH_SHIFT |
 850                  RXDCTL_HTHRESH_DEFAULT << IXGB_RXDCTL_HTHRESH_SHIFT |
 851                  RXDCTL_PTHRESH_DEFAULT << IXGB_RXDCTL_PTHRESH_SHIFT;
 852         IXGB_WRITE_REG(hw, RXDCTL, rxdctl);
 853
 854         /* Enable Receive Checksum Offload for TCP and UDP */
 855         if(adapter->rx_csum == TRUE) {
 856                 rxcsum = IXGB_READ_REG(hw, RXCSUM);
 857                 rxcsum |= IXGB_RXCSUM_TUOFL;
 858                 IXGB_WRITE_REG(hw, RXCSUM, rxcsum);
 859         }
 860
 861         /* Enable Receives */
 862
 863         IXGB_WRITE_REG(hw, RCTL, rctl);
 864 }
 865
 866 /**
 867  * ixgb_free_tx_resources - Free Tx Resources
 868  * @adapter: board private structure
 869  *
 870  * Free all transmit software resources
 871  **/
 872
 873 void
 874 ixgb_free_tx_resources(struct ixgb_adapter *adapter)
 875 {
 876         struct pci_dev *pdev = adapter->pdev;
 877
 878         ixgb_clean_tx_ring(adapter);
 879
 880         vfree(adapter->tx_ring.buffer_info);
 881         adapter->tx_ring.buffer_info = NULL;
 882
 883         pci_free_consistent(pdev, adapter->tx_ring.size,
 884                             adapter->tx_ring.desc, adapter->tx_ring.dma);
 885
 886         adapter->tx_ring.desc = NULL;
 887 }
 888
 889 static inline void
 890 ixgb_unmap_and_free_tx_resource(struct ixgb_adapter *adapter,
 891                                         struct ixgb_buffer *buffer_info)
 892 {
 893         struct pci_dev *pdev = adapter->pdev;
 894         if(buffer_info->dma) {
 895                 pci_unmap_page(pdev,
 896                            buffer_info->dma,
 897                            buffer_info->length,
 898                            PCI_DMA_TODEVICE);
 899                 buffer_info->dma = 0;
 900         }
 901         if(buffer_info->skb) {
 902                 dev_kfree_skb_any(buffer_info->skb);
 903                 buffer_info->skb = NULL;
 904         }
 905 }
 906
 907 /**
 908  * ixgb_clean_tx_ring - Free Tx Buffers
 909  * @adapter: board private structure
 910  **/
 911
 912 static void
 913 ixgb_clean_tx_ring(struct ixgb_adapter *adapter)
 914 {
 915         struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
 916         struct ixgb_buffer *buffer_info;
 917         unsigned long size;
 918         unsigned int i;
 919
 920         /* Free all the Tx ring sk_buffs */
 921
 922         for(i = 0; i < tx_ring->count; i++) {
 923                 buffer_info = &tx_ring->buffer_info[i];
 924                 ixgb_unmap_and_free_tx_resource(adapter, buffer_info);
 925         }
 926
 927         size = sizeof(struct ixgb_buffer) * tx_ring->count;
 928         memset(tx_ring->buffer_info, 0, size);
 929
 930         /* Zero out the descriptor ring */
 931
 932         memset(tx_ring->desc, 0, tx_ring->size);
 933
 934         tx_ring->next_to_use = 0;
 935         tx_ring->next_to_clean = 0;
 936
 937         IXGB_WRITE_REG(&adapter->hw, TDH, 0);
 938         IXGB_WRITE_REG(&adapter->hw, TDT, 0);
 939 }
 940
 941 /**
 942  * ixgb_free_rx_resources - Free Rx Resources
 943  * @adapter: board private structure
 944  *
 945  * Free all receive software resources
 946  **/
 947
 948 void
 949 ixgb_free_rx_resources(struct ixgb_adapter *adapter)
 950 {
 951         struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
 952         struct pci_dev *pdev = adapter->pdev;
 953
 954         ixgb_clean_rx_ring(adapter);
 955
 956         vfree(rx_ring->buffer_info);
 957         rx_ring->buffer_info = NULL;
 958
 959         pci_free_consistent(pdev, rx_ring->size, rx_ring->desc, rx_ring->dma);
 960
 961         rx_ring->desc = NULL;
 962 }
 963
 964 /**
 965  * ixgb_clean_rx_ring - Free Rx Buffers
 966  * @adapter: board private structure
 967  **/
 968
 969 static void
 970 ixgb_clean_rx_ring(struct ixgb_adapter *adapter)
 971 {
 972         struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
 973         struct ixgb_buffer *buffer_info;
 974         struct pci_dev *pdev = adapter->pdev;
 975         unsigned long size;
 976         unsigned int i;
 977
 978         /* Free all the Rx ring sk_buffs */
 979
 980         for(i = 0; i < rx_ring->count; i++) {
 981                 buffer_info = &rx_ring->buffer_info[i];
 982                 if(buffer_info->skb) {
 983
 984                         pci_unmap_single(pdev,
 985                                          buffer_info->dma,
 986                                          buffer_info->length,
 987                                          PCI_DMA_FROMDEVICE);
 988
 989                         dev_kfree_skb(buffer_info->skb);
 990
 991                         buffer_info->skb = NULL;
 992                 }
 993         }
 994
 995         size = sizeof(struct ixgb_buffer) * rx_ring->count;
 996         memset(rx_ring->buffer_info, 0, size);
 997
 998         /* Zero out the descriptor ring */
 999
1000         memset(rx_ring->desc, 0, rx_ring->size);
1001
1002         rx_ring->next_to_clean = 0;
1003         rx_ring->next_to_use = 0;
1004
1005         IXGB_WRITE_REG(&adapter->hw, RDH, 0);
1006         IXGB_WRITE_REG(&adapter->hw, RDT, 0);
1007 }
1008
1009 /**
1010  * ixgb_set_mac - Change the Ethernet Address of the NIC
1011  * @netdev: network interface device structure
1012  * @p: pointer to an address structure
1013  *
1014  * Returns 0 on success, negative on failure
1015  **/
1016
1017 static int
1018 ixgb_set_mac(struct net_device *netdev, void *p)
1019 {
1020         struct ixgb_adapter *adapter = netdev->priv;
1021         struct sockaddr *addr = p;
1022
1023         if(!is_valid_ether_addr(addr->sa_data))
1024                 return -EADDRNOTAVAIL;
1025
1026         memcpy(netdev->dev_addr, addr->sa_data, netdev->addr_len);
1027
1028         ixgb_rar_set(&adapter->hw, addr->sa_data, 0);
1029
1030         return 0;
1031 }
1032
1033 /**
1034  * ixgb_set_multi - Multicast and Promiscuous mode set
1035  * @netdev: network interface device structure
1036  *
1037  * The set_multi entry point is called whenever the multicast address
1038  * list or the network interface flags are updated.  This routine is
1039  * responsible for configuring the hardware for proper multicast,
1040  * promiscuous mode, and all-multi behavior.
1041  **/
1042
1043 static void
1044 ixgb_set_multi(struct net_device *netdev)
1045 {
1046         struct ixgb_adapter *adapter = netdev->priv;
1047         struct ixgb_hw *hw = &adapter->hw;
1048         struct dev_mc_list *mc_ptr;
1049         uint32_t rctl;
1050         int i;
1051
1052         /* Check for Promiscuous and All Multicast modes */
1053
1054         rctl = IXGB_READ_REG(hw, RCTL);
1055
1056         if(netdev->flags & IFF_PROMISC) {
1057                 rctl |= (IXGB_RCTL_UPE | IXGB_RCTL_MPE);
1058         } else if(netdev->flags & IFF_ALLMULTI) {
1059                 rctl |= IXGB_RCTL_MPE;
1060                 rctl &= ~IXGB_RCTL_UPE;
1061         } else {
1062                 rctl &= ~(IXGB_RCTL_UPE | IXGB_RCTL_MPE);
1063         }
1064
1065         if(netdev->mc_count > IXGB_MAX_NUM_MULTICAST_ADDRESSES) {
1066                 rctl |= IXGB_RCTL_MPE;
1067                 IXGB_WRITE_REG(hw, RCTL, rctl);
1068         } else {
1069                 uint8_t mta[netdev->mc_count * IXGB_ETH_LENGTH_OF_ADDRESS];
1070
1071                 IXGB_WRITE_REG(hw, RCTL, rctl);
1072
1073                 for(i = 0, mc_ptr = netdev->mc_list; mc_ptr;
1074                         i++, mc_ptr = mc_ptr->next)
1075                         memcpy(&mta[i * IXGB_ETH_LENGTH_OF_ADDRESS],
1076                                    mc_ptr->dmi_addr, IXGB_ETH_LENGTH_OF_ADDRESS);
1077
1078                 ixgb_mc_addr_list_update(hw, mta, netdev->mc_count, 0);
1079         }
1080 }
1081
1082 /**
1083  * ixgb_watchdog - Timer Call-back
1084  * @data: pointer to netdev cast into an unsigned long
1085  **/
1086
1087 static void
1088 ixgb_watchdog(unsigned long data)
1089 {
1090         struct ixgb_adapter *adapter = (struct ixgb_adapter *)data;
1091         struct net_device *netdev = adapter->netdev;
1092         struct ixgb_desc_ring *txdr = &adapter->tx_ring;
1093
1094         ixgb_check_for_link(&adapter->hw);
1095
1096         if (ixgb_check_for_bad_link(&adapter->hw)) {
1097                 /* force the reset path */
1098                 netif_stop_queue(netdev);
1099         }
1100
1101         if(adapter->hw.link_up) {
1102                 if(!netif_carrier_ok(netdev)) {
1103                         printk(KERN_INFO "ixgb: %s NIC Link is Up %d Mbps %s\n",
1104                                    netdev->name, 10000, "Full Duplex");
1105                         adapter->link_speed = 10000;
1106                         adapter->link_duplex = FULL_DUPLEX;
1107                         netif_carrier_on(netdev);
1108                         netif_wake_queue(netdev);
1109                 }
1110         } else {
1111                 if(netif_carrier_ok(netdev)) {
1112                         adapter->link_speed = 0;
1113                         adapter->link_duplex = 0;
1114                         printk(KERN_INFO
1115                                    "ixgb: %s NIC Link is Down\n",
1116                                    netdev->name);
1117                         netif_carrier_off(netdev);
1118                         netif_stop_queue(netdev);
1119
1120                 }
1121         }
1122
1123         ixgb_update_stats(adapter);
1124
1125         if(!netif_carrier_ok(netdev)) {
1126                 if(IXGB_DESC_UNUSED(txdr) + 1 < txdr->count) {
1127                         /* We've lost link, so the controller stops DMA,
1128                          * but we've got queued Tx work that's never going
1129                          * to get done, so reset controller to flush Tx.
1130                          * (Do the reset outside of interrupt context). */
1131                         schedule_work(&adapter->tx_timeout_task);
1132                 }
1133         }
1134
1135         /* Force detection of hung controller every watchdog period */
1136         adapter->detect_tx_hung = TRUE;
1137
1138         /* generate an interrupt to force clean up of any stragglers */
1139         IXGB_WRITE_REG(&adapter->hw, ICS, IXGB_INT_TXDW);
1140
1141         /* Reset the timer */
1142         mod_timer(&adapter->watchdog_timer, jiffies + 2 * HZ);
1143 }
1144
1145 #define IXGB_TX_FLAGS_CSUM              0x00000001
1146 #define IXGB_TX_FLAGS_VLAN              0x00000002
1147 #define IXGB_TX_FLAGS_TSO               0x00000004
1148
1149 static inline int
1150 ixgb_tso(struct ixgb_adapter *adapter, struct sk_buff *skb)
1151 {
1152 #ifdef NETIF_F_TSO
1153         struct ixgb_context_desc *context_desc;
1154         unsigned int i;
1155         uint8_t ipcss, ipcso, tucss, tucso, hdr_len;
1156         uint16_t ipcse, tucse, mss;
1157         int err;
1158
1159         if(likely(skb_shinfo(skb)->tso_size)) {
1160                 if (skb_header_cloned(skb)) {
1161                         err = pskb_expand_head(skb, 0, 0, GFP_ATOMIC);
1162                         if (err)
1163                                 return err;
1164                 }
1165
1166                 hdr_len = ((skb->h.raw - skb->data) + (skb->h.th->doff << 2));
1167                 mss = skb_shinfo(skb)->tso_size;
1168                 skb->nh.iph->tot_len = 0;
1169                 skb->nh.iph->check = 0;
1170                 skb->h.th->check = ~csum_tcpudp_magic(skb->nh.iph->saddr,
1171                                                       skb->nh.iph->daddr,
1172                                                       0, IPPROTO_TCP, 0);
1173                 ipcss = skb->nh.raw - skb->data;
1174                 ipcso = (void *)&(skb->nh.iph->check) - (void *)skb->data;
1175                 ipcse = skb->h.raw - skb->data - 1;
1176                 tucss = skb->h.raw - skb->data;
1177                 tucso = (void *)&(skb->h.th->check) - (void *)skb->data;
1178                 tucse = 0;
1179
1180                 i = adapter->tx_ring.next_to_use;
1181                 context_desc = IXGB_CONTEXT_DESC(adapter->tx_ring, i);
1182
1183                 context_desc->ipcss = ipcss;
1184                 context_desc->ipcso = ipcso;
1185                 context_desc->ipcse = cpu_to_le16(ipcse);
1186                 context_desc->tucss = tucss;
1187                 context_desc->tucso = tucso;
1188                 context_desc->tucse = cpu_to_le16(tucse);
1189                 context_desc->mss = cpu_to_le16(mss);
1190                 context_desc->hdr_len = hdr_len;
1191                 context_desc->status = 0;
1192                 context_desc->cmd_type_len = cpu_to_le32(
1193                                                   IXGB_CONTEXT_DESC_TYPE
1194                                                 | IXGB_CONTEXT_DESC_CMD_TSE
1195                                                 | IXGB_CONTEXT_DESC_CMD_IP
1196                                                 | IXGB_CONTEXT_DESC_CMD_TCP
1197                                                 | IXGB_CONTEXT_DESC_CMD_IDE
1198                                                 | (skb->len - (hdr_len)));
1199
1200
1201                 if(++i == adapter->tx_ring.count) i = 0;
1202                 adapter->tx_ring.next_to_use = i;
1203
1204                 return 1;
1205         }
1206 #endif
1207
1208         return 0;
1209 }
1210
1211 static inline boolean_t
1212 ixgb_tx_csum(struct ixgb_adapter *adapter, struct sk_buff *skb)
1213 {
1214         struct ixgb_context_desc *context_desc;
1215         unsigned int i;
1216         uint8_t css, cso;
1217
1218         if(likely(skb->ip_summed == CHECKSUM_HW)) {
1219                 css = skb->h.raw - skb->data;
1220                 cso = (skb->h.raw + skb->csum) - skb->data;
1221
1222                 i = adapter->tx_ring.next_to_use;
1223                 context_desc = IXGB_CONTEXT_DESC(adapter->tx_ring, i);
1224
1225                 context_desc->tucss = css;
1226                 context_desc->tucso = cso;
1227                 context_desc->tucse = 0;
1228                 /* zero out any previously existing data in one instruction */
1229                 *(uint32_t *)&(context_desc->ipcss) = 0;
1230                 context_desc->status = 0;
1231                 context_desc->hdr_len = 0;
1232                 context_desc->mss = 0;
1233                 context_desc->cmd_type_len =
1234                         cpu_to_le32(IXGB_CONTEXT_DESC_TYPE
1235                                     | IXGB_TX_DESC_CMD_IDE);
1236
1237                 if(++i == adapter->tx_ring.count) i = 0;
1238                 adapter->tx_ring.next_to_use = i;
1239
1240                 return TRUE;
1241         }
1242
1243         return FALSE;
1244 }
1245
1246 #define IXGB_MAX_TXD_PWR        14
1247 #define IXGB_MAX_DATA_PER_TXD   (1<<IXGB_MAX_TXD_PWR)
1248
1249 static inline int
1250 ixgb_tx_map(struct ixgb_adapter *adapter, struct sk_buff *skb,
1251             unsigned int first)
1252 {
1253         struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
1254         struct ixgb_buffer *buffer_info;
1255         int len = skb->len;
1256         unsigned int offset = 0, size, count = 0, i;
1257
1258         unsigned int nr_frags = skb_shinfo(skb)->nr_frags;
1259         unsigned int f;
1260
1261         len -= skb->data_len;
1262
1263         i = tx_ring->next_to_use;
1264
1265         while(len) {
1266                 buffer_info = &tx_ring->buffer_info[i];
1267                 size = min(len, IXGB_MAX_JUMBO_FRAME_SIZE);
1268                 buffer_info->length = size;
1269                 buffer_info->dma =
1270                         pci_map_single(adapter->pdev,
1271                                 skb->data + offset,
1272                                 size,
1273                                 PCI_DMA_TODEVICE);
1274                 buffer_info->time_stamp = jiffies;
1275
1276                 len -= size;
1277                 offset += size;
1278                 count++;
1279                 if(++i == tx_ring->count) i = 0;
1280         }
1281
1282         for(f = 0; f < nr_frags; f++) {
1283                 struct skb_frag_struct *frag;
1284
1285                 frag = &skb_shinfo(skb)->frags[f];
1286                 len = frag->size;
1287                 offset = 0;
1288
1289                 while(len) {
1290                         buffer_info = &tx_ring->buffer_info[i];
1291                         size = min(len, IXGB_MAX_JUMBO_FRAME_SIZE);
1292                         buffer_info->length = size;
1293                         buffer_info->dma =
1294                                 pci_map_page(adapter->pdev,
1295                                         frag->page,
1296                                         frag->page_offset + offset,
1297                                         size,
1298                                         PCI_DMA_TODEVICE);
1299                         buffer_info->time_stamp = jiffies;
1300
1301                         len -= size;
1302                         offset += size;
1303                         count++;
1304                         if(++i == tx_ring->count) i = 0;
1305                 }
1306         }
1307         i = (i == 0) ? tx_ring->count - 1 : i - 1;
1308         tx_ring->buffer_info[i].skb = skb;
1309         tx_ring->buffer_info[first].next_to_watch = i;
1310
1311         return count;
1312 }
1313
1314 static inline void
1315 ixgb_tx_queue(struct ixgb_adapter *adapter, int count, int vlan_id,int tx_flags)
1316 {
1317         struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
1318         struct ixgb_tx_desc *tx_desc = NULL;
1319         struct ixgb_buffer *buffer_info;
1320         uint32_t cmd_type_len = adapter->tx_cmd_type;
1321         uint8_t status = 0;
1322         uint8_t popts = 0;
1323         unsigned int i;
1324
1325         if(tx_flags & IXGB_TX_FLAGS_TSO) {
1326                 cmd_type_len |= IXGB_TX_DESC_CMD_TSE;
1327                 popts |= (IXGB_TX_DESC_POPTS_IXSM | IXGB_TX_DESC_POPTS_TXSM);
1328         }
1329
1330         if(tx_flags & IXGB_TX_FLAGS_CSUM)
1331                 popts |= IXGB_TX_DESC_POPTS_TXSM;
1332
1333         if(tx_flags & IXGB_TX_FLAGS_VLAN) {
1334                 cmd_type_len |= IXGB_TX_DESC_CMD_VLE;
1335         }
1336
1337         i = tx_ring->next_to_use;
1338
1339         while(count--) {
1340                 buffer_info = &tx_ring->buffer_info[i];
1341                 tx_desc = IXGB_TX_DESC(*tx_ring, i);
1342                 tx_desc->buff_addr = cpu_to_le64(buffer_info->dma);
1343                 tx_desc->cmd_type_len =
1344                         cpu_to_le32(cmd_type_len | buffer_info->length);
1345                 tx_desc->status = status;
1346                 tx_desc->popts = popts;
1347                 tx_desc->vlan = cpu_to_le16(vlan_id);
1348
1349                 if(++i == tx_ring->count) i = 0;
1350         }
1351
1352         tx_desc->cmd_type_len |= cpu_to_le32(IXGB_TX_DESC_CMD_EOP
1353                                 | IXGB_TX_DESC_CMD_RS );
1354
1355         /* Force memory writes to complete before letting h/w
1356          * know there are new descriptors to fetch.  (Only
1357          * applicable for weak-ordered memory model archs,
1358          * such as IA-64). */
1359         wmb();
1360
1361         tx_ring->next_to_use = i;
1362         IXGB_WRITE_REG(&adapter->hw, TDT, i);
1363 }
1364
1365 /* Tx Descriptors needed, worst case */
1366 #define TXD_USE_COUNT(S) (((S) >> IXGB_MAX_TXD_PWR) + \
1367                          (((S) & (IXGB_MAX_DATA_PER_TXD - 1)) ? 1 : 0))
1368 #define DESC_NEEDED TXD_USE_COUNT(IXGB_MAX_DATA_PER_TXD) + \
1369         MAX_SKB_FRAGS * TXD_USE_COUNT(PAGE_SIZE) + 1
1370
1371 static int
1372 ixgb_xmit_frame(struct sk_buff *skb, struct net_device *netdev)
1373 {
1374         struct ixgb_adapter *adapter = netdev->priv;
1375         unsigned int first;
1376         unsigned int tx_flags = 0;
1377         unsigned long flags;
1378         int vlan_id = 0;
1379         int tso;
1380
1381         if(skb->len <= 0) {
1382                 dev_kfree_skb_any(skb);
1383                 return 0;
1384         }
1385
1386         spin_lock_irqsave(&adapter->tx_lock, flags);
1387         if(unlikely(IXGB_DESC_UNUSED(&adapter->tx_ring) < DESC_NEEDED)) {
1388                 netif_stop_queue(netdev);
1389                 spin_unlock_irqrestore(&adapter->tx_lock, flags);
1390                 return 1;
1391         }
1392         spin_unlock_irqrestore(&adapter->tx_lock, flags);
1393
1394         if(adapter->vlgrp && vlan_tx_tag_present(skb)) {
1395                 tx_flags |= IXGB_TX_FLAGS_VLAN;
1396                 vlan_id = vlan_tx_tag_get(skb);
1397         }
1398
1399         first = adapter->tx_ring.next_to_use;
1400
1401         tso = ixgb_tso(adapter, skb);
1402         if (tso < 0) {
1403                 dev_kfree_skb_any(skb);
1404                 return NETDEV_TX_OK;
1405         }
1406
1407         if (tso)
1408                 tx_flags |= IXGB_TX_FLAGS_TSO;
1409         else if(ixgb_tx_csum(adapter, skb))
1410                 tx_flags |= IXGB_TX_FLAGS_CSUM;
1411
1412         ixgb_tx_queue(adapter, ixgb_tx_map(adapter, skb, first), vlan_id,
1413                         tx_flags);
1414
1415         netdev->trans_start = jiffies;
1416
1417         return 0;
1418 }
1419
1420 /**
1421  * ixgb_tx_timeout - Respond to a Tx Hang
1422  * @netdev: network interface device structure
1423  **/
1424
1425 static void
1426 ixgb_tx_timeout(struct net_device *netdev)
1427 {
1428         struct ixgb_adapter *adapter = netdev->priv;
1429
1430         /* Do the reset outside of interrupt context */
1431         schedule_work(&adapter->tx_timeout_task);
1432 }
1433
1434 static void
1435 ixgb_tx_timeout_task(struct net_device *netdev)
1436 {
1437         struct ixgb_adapter *adapter = netdev->priv;
1438
1439         ixgb_down(adapter, TRUE);
1440         ixgb_up(adapter);
1441 }
1442
1443 /**
1444  * ixgb_get_stats - Get System Network Statistics
1445  * @netdev: network interface device structure
1446  *
1447  * Returns the address of the device statistics structure.
1448  * The statistics are actually updated from the timer callback.
1449  **/
1450
1451 static struct net_device_stats *
1452 ixgb_get_stats(struct net_device *netdev)
1453 {
1454         struct ixgb_adapter *adapter = netdev->priv;
1455
1456         return &adapter->net_stats;
1457 }
1458
1459 /**
1460  * ixgb_change_mtu - Change the Maximum Transfer Unit
1461  * @netdev: network interface device structure
1462  * @new_mtu: new value for maximum frame size
1463  *
1464  * Returns 0 on success, negative on failure
1465  **/
1466
1467 static int
1468 ixgb_change_mtu(struct net_device *netdev, int new_mtu)
1469 {
1470         struct ixgb_adapter *adapter = netdev->priv;
1471         int max_frame = new_mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;
1472         int old_max_frame = netdev->mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;
1473
1474
1475         if((max_frame < IXGB_MIN_ENET_FRAME_SIZE_WITHOUT_FCS + ENET_FCS_LENGTH)
1476            || (max_frame > IXGB_MAX_JUMBO_FRAME_SIZE + ENET_FCS_LENGTH)) {
1477                 IXGB_ERR("Invalid MTU setting\n");
1478                 return -EINVAL;
1479         }
1480
1481         if((max_frame <= IXGB_MAX_ENET_FRAME_SIZE_WITHOUT_FCS + ENET_FCS_LENGTH)
1482            || (max_frame <= IXGB_RXBUFFER_2048)) {
1483                 adapter->rx_buffer_len = IXGB_RXBUFFER_2048;
1484
1485         } else if(max_frame <= IXGB_RXBUFFER_4096) {
1486                 adapter->rx_buffer_len = IXGB_RXBUFFER_4096;
1487
1488         } else if(max_frame <= IXGB_RXBUFFER_8192) {
1489                 adapter->rx_buffer_len = IXGB_RXBUFFER_8192;
1490
1491         } else {
1492                 adapter->rx_buffer_len = IXGB_RXBUFFER_16384;
1493         }
1494
1495         netdev->mtu = new_mtu;
1496
1497         if(old_max_frame != max_frame && netif_running(netdev)) {
1498
1499                 ixgb_down(adapter, TRUE);
1500                 ixgb_up(adapter);
1501         }
1502
1503         return 0;
1504 }
1505
1506 /**
1507  * ixgb_update_stats - Update the board statistics counters.
1508  * @adapter: board private structure
1509  **/
1510
1511 void
1512 ixgb_update_stats(struct ixgb_adapter *adapter)
1513 {
1514         struct net_device *netdev = adapter->netdev;
1515
1516         if((netdev->flags & IFF_PROMISC) || (netdev->flags & IFF_ALLMULTI) ||
1517            (netdev->mc_count > IXGB_MAX_NUM_MULTICAST_ADDRESSES)) {
1518                 u64 multi = IXGB_READ_REG(&adapter->hw, MPRCL);
1519                 u32 bcast_l = IXGB_READ_REG(&adapter->hw, BPRCL);
1520                 u32 bcast_h = IXGB_READ_REG(&adapter->hw, BPRCH);
1521                 u64 bcast = ((u64)bcast_h << 32) | bcast_l;
1522
1523                 multi |= ((u64)IXGB_READ_REG(&adapter->hw, MPRCH) << 32);
1524                 /* fix up multicast stats by removing broadcasts */
1525                 multi -= bcast;
1526
1527                 adapter->stats.mprcl += (multi & 0xFFFFFFFF);
1528                 adapter->stats.mprch += (multi >> 32);
1529                 adapter->stats.bprcl += bcast_l;
1530                 adapter->stats.bprch += bcast_h;
1531         } else {
1532                 adapter->stats.mprcl += IXGB_READ_REG(&adapter->hw, MPRCL);
1533                 adapter->stats.mprch += IXGB_READ_REG(&adapter->hw, MPRCH);
1534                 adapter->stats.bprcl += IXGB_READ_REG(&adapter->hw, BPRCL);
1535                 adapter->stats.bprch += IXGB_READ_REG(&adapter->hw, BPRCH);
1536         }
1537         adapter->stats.tprl += IXGB_READ_REG(&adapter->hw, TPRL);
1538         adapter->stats.tprh += IXGB_READ_REG(&adapter->hw, TPRH);
1539         adapter->stats.gprcl += IXGB_READ_REG(&adapter->hw, GPRCL);
1540         adapter->stats.gprch += IXGB_READ_REG(&adapter->hw, GPRCH);
1541         adapter->stats.uprcl += IXGB_READ_REG(&adapter->hw, UPRCL);
1542         adapter->stats.uprch += IXGB_READ_REG(&adapter->hw, UPRCH);
1543         adapter->stats.vprcl += IXGB_READ_REG(&adapter->hw, VPRCL);
1544         adapter->stats.vprch += IXGB_READ_REG(&adapter->hw, VPRCH);
1545         adapter->stats.jprcl += IXGB_READ_REG(&adapter->hw, JPRCL);
1546         adapter->stats.jprch += IXGB_READ_REG(&adapter->hw, JPRCH);
1547         adapter->stats.gorcl += IXGB_READ_REG(&adapter->hw, GORCL);
1548         adapter->stats.gorch += IXGB_READ_REG(&adapter->hw, GORCH);
1549         adapter->stats.torl += IXGB_READ_REG(&adapter->hw, TORL);
1550         adapter->stats.torh += IXGB_READ_REG(&adapter->hw, TORH);
1551         adapter->stats.rnbc += IXGB_READ_REG(&adapter->hw, RNBC);
1552         adapter->stats.ruc += IXGB_READ_REG(&adapter->hw, RUC);
1553         adapter->stats.roc += IXGB_READ_REG(&adapter->hw, ROC);
1554         adapter->stats.rlec += IXGB_READ_REG(&adapter->hw, RLEC);
1555         adapter->stats.crcerrs += IXGB_READ_REG(&adapter->hw, CRCERRS);
1556         adapter->stats.icbc += IXGB_READ_REG(&adapter->hw, ICBC);
1557         adapter->stats.ecbc += IXGB_READ_REG(&adapter->hw, ECBC);
1558         adapter->stats.mpc += IXGB_READ_REG(&adapter->hw, MPC);
1559         adapter->stats.tptl += IXGB_READ_REG(&adapter->hw, TPTL);
1560         adapter->stats.tpth += IXGB_READ_REG(&adapter->hw, TPTH);
1561         adapter->stats.gptcl += IXGB_READ_REG(&adapter->hw, GPTCL);
1562         adapter->stats.gptch += IXGB_READ_REG(&adapter->hw, GPTCH);
1563         adapter->stats.bptcl += IXGB_READ_REG(&adapter->hw, BPTCL);
1564         adapter->stats.bptch += IXGB_READ_REG(&adapter->hw, BPTCH);
1565         adapter->stats.mptcl += IXGB_READ_REG(&adapter->hw, MPTCL);
1566         adapter->stats.mptch += IXGB_READ_REG(&adapter->hw, MPTCH);
1567         adapter->stats.uptcl += IXGB_READ_REG(&adapter->hw, UPTCL);
1568         adapter->stats.uptch += IXGB_READ_REG(&adapter->hw, UPTCH);
1569         adapter->stats.vptcl += IXGB_READ_REG(&adapter->hw, VPTCL);
1570         adapter->stats.vptch += IXGB_READ_REG(&adapter->hw, VPTCH);
1571         adapter->stats.jptcl += IXGB_READ_REG(&adapter->hw, JPTCL);
1572         adapter->stats.jptch += IXGB_READ_REG(&adapter->hw, JPTCH);
1573         adapter->stats.gotcl += IXGB_READ_REG(&adapter->hw, GOTCL);
1574         adapter->stats.gotch += IXGB_READ_REG(&adapter->hw, GOTCH);
1575         adapter->stats.totl += IXGB_READ_REG(&adapter->hw, TOTL);
1576         adapter->stats.toth += IXGB_READ_REG(&adapter->hw, TOTH);
1577         adapter->stats.dc += IXGB_READ_REG(&adapter->hw, DC);
1578         adapter->stats.plt64c += IXGB_READ_REG(&adapter->hw, PLT64C);
1579         adapter->stats.tsctc += IXGB_READ_REG(&adapter->hw, TSCTC);
1580         adapter->stats.tsctfc += IXGB_READ_REG(&adapter->hw, TSCTFC);
1581         adapter->stats.ibic += IXGB_READ_REG(&adapter->hw, IBIC);
1582         adapter->stats.rfc += IXGB_READ_REG(&adapter->hw, RFC);
1583         adapter->stats.lfc += IXGB_READ_REG(&adapter->hw, LFC);
1584         adapter->stats.pfrc += IXGB_READ_REG(&adapter->hw, PFRC);
1585         adapter->stats.pftc += IXGB_READ_REG(&adapter->hw, PFTC);
1586         adapter->stats.mcfrc += IXGB_READ_REG(&adapter->hw, MCFRC);
1587         adapter->stats.mcftc += IXGB_READ_REG(&adapter->hw, MCFTC);
1588         adapter->stats.xonrxc += IXGB_READ_REG(&adapter->hw, XONRXC);
1589         adapter->stats.xontxc += IXGB_READ_REG(&adapter->hw, XONTXC);
1590         adapter->stats.xoffrxc += IXGB_READ_REG(&adapter->hw, XOFFRXC);
1591         adapter->stats.xofftxc += IXGB_READ_REG(&adapter->hw, XOFFTXC);
1592         adapter->stats.rjc += IXGB_READ_REG(&adapter->hw, RJC);
1593
1594         /* Fill out the OS statistics structure */
1595
1596         adapter->net_stats.rx_packets = adapter->stats.gprcl;
1597         adapter->net_stats.tx_packets = adapter->stats.gptcl;
1598         adapter->net_stats.rx_bytes = adapter->stats.gorcl;
1599         adapter->net_stats.tx_bytes = adapter->stats.gotcl;
1600         adapter->net_stats.multicast = adapter->stats.mprcl;
1601         adapter->net_stats.collisions = 0;
1602
1603         /* ignore RLEC as it reports errors for padded (<64bytes) frames
1604          * with a length in the type/len field */
1605         adapter->net_stats.rx_errors =
1606             /* adapter->stats.rnbc + */ adapter->stats.crcerrs +
1607             adapter->stats.ruc +
1608             adapter->stats.roc /*+ adapter->stats.rlec */  +
1609             adapter->stats.icbc +
1610             adapter->stats.ecbc + adapter->stats.mpc;
1611
1612         adapter->net_stats.rx_dropped = adapter->stats.mpc;
1613
1614         /* see above
1615          * adapter->net_stats.rx_length_errors = adapter->stats.rlec;
1616          */
1617
1618         adapter->net_stats.rx_crc_errors = adapter->stats.crcerrs;
1619         adapter->net_stats.rx_fifo_errors = adapter->stats.mpc;
1620         adapter->net_stats.rx_missed_errors = adapter->stats.mpc;
1621         adapter->net_stats.rx_over_errors = adapter->stats.mpc;
1622
1623         adapter->net_stats.tx_errors = 0;
1624         adapter->net_stats.rx_frame_errors = 0;
1625         adapter->net_stats.tx_aborted_errors = 0;
1626         adapter->net_stats.tx_carrier_errors = 0;
1627         adapter->net_stats.tx_fifo_errors = 0;
1628         adapter->net_stats.tx_heartbeat_errors = 0;
1629         adapter->net_stats.tx_window_errors = 0;
1630 }
1631
1632 #define IXGB_MAX_INTR 10
1633 /**
1634  * ixgb_intr - Interrupt Handler
1635  * @irq: interrupt number
1636  * @data: pointer to a network interface device structure
1637  * @pt_regs: CPU registers structure
1638  **/
1639
1640 static irqreturn_t
1641 ixgb_intr(int irq, void *data, struct pt_regs *regs)
1642 {
1643         struct net_device *netdev = data;
1644         struct ixgb_adapter *adapter = netdev->priv;
1645         struct ixgb_hw *hw = &adapter->hw;
1646         uint32_t icr = IXGB_READ_REG(hw, ICR);
1647 #ifndef CONFIG_IXGB_NAPI
1648         unsigned int i;
1649 #endif
1650
1651         if(unlikely(!icr))
1652                 return IRQ_NONE;  /* Not our interrupt */
1653
1654         if(unlikely(icr & (IXGB_INT_RXSEQ | IXGB_INT_LSC))) {
1655                 mod_timer(&adapter->watchdog_timer, jiffies);
1656         }
1657
1658 #ifdef CONFIG_IXGB_NAPI
1659         if(netif_rx_schedule_prep(netdev)) {
1660
1661                 /* Disable interrupts and register for poll. The flush
1662                   of the posted write is intentionally left out.
1663                 */
1664
1665                 atomic_inc(&adapter->irq_sem);
1666                 IXGB_WRITE_REG(&adapter->hw, IMC, ~0);
1667                 __netif_rx_schedule(netdev);
1668         }
1669 #else
1670         /* yes, that is actually a & and it is meant to make sure that
1671          * every pass through this for loop checks both receive and
1672          * transmit queues for completed descriptors, intended to
1673          * avoid starvation issues and assist tx/rx fairness. */
1674         for(i = 0; i < IXGB_MAX_INTR; i++)
1675                 if(!ixgb_clean_rx_irq(adapter) &
1676                    !ixgb_clean_tx_irq(adapter))
1677                         break;
1678 #endif
1679         return IRQ_HANDLED;
1680 }
1681
1682 #ifdef CONFIG_IXGB_NAPI
1683 /**
1684  * ixgb_clean - NAPI Rx polling callback
1685  * @adapter: board private structure
1686  **/
1687
1688 static int
1689 ixgb_clean(struct net_device *netdev, int *budget)
1690 {
1691         struct ixgb_adapter *adapter = netdev->priv;
1692         int work_to_do = min(*budget, netdev->quota);
1693         int tx_cleaned;
1694         int work_done = 0;
1695
1696         tx_cleaned = ixgb_clean_tx_irq(adapter);
1697         ixgb_clean_rx_irq(adapter, &work_done, work_to_do);
1698
1699         *budget -= work_done;
1700         netdev->quota -= work_done;
1701
1702         /* if no Tx and not enough Rx work done, exit the polling mode */
1703         if((!tx_cleaned && (work_done == 0)) || !netif_running(netdev)) {
1704                 netif_rx_complete(netdev);
1705                 ixgb_irq_enable(adapter);
1706                 return 0;
1707         }
1708
1709         return 1;
1710 }
1711 #endif
1712
1713 /**
1714  * ixgb_clean_tx_irq - Reclaim resources after transmit completes
1715  * @adapter: board private structure
1716  **/
1717
1718 static boolean_t
1719 ixgb_clean_tx_irq(struct ixgb_adapter *adapter)
1720 {
1721         struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
1722         struct net_device *netdev = adapter->netdev;
1723         struct ixgb_tx_desc *tx_desc, *eop_desc;
1724         struct ixgb_buffer *buffer_info;
1725         unsigned int i, eop;
1726         boolean_t cleaned = FALSE;
1727
1728         i = tx_ring->next_to_clean;
1729         eop = tx_ring->buffer_info[i].next_to_watch;
1730         eop_desc = IXGB_TX_DESC(*tx_ring, eop);
1731
1732         while(eop_desc->status & IXGB_TX_DESC_STATUS_DD) {
1733
1734                 for(cleaned = FALSE; !cleaned; ) {
1735                         tx_desc = IXGB_TX_DESC(*tx_ring, i);
1736                         buffer_info = &tx_ring->buffer_info[i];
1737
1738                         if (tx_desc->popts
1739                             & (IXGB_TX_DESC_POPTS_TXSM |
1740                                IXGB_TX_DESC_POPTS_IXSM))
1741                                 adapter->hw_csum_tx_good++;
1742
1743                         ixgb_unmap_and_free_tx_resource(adapter, buffer_info);
1744
1745                         *(uint32_t *)&(tx_desc->status) = 0;
1746
1747                         cleaned = (i == eop);
1748                         if(++i == tx_ring->count) i = 0;
1749                 }
1750
1751                 eop = tx_ring->buffer_info[i].next_to_watch;
1752                 eop_desc = IXGB_TX_DESC(*tx_ring, eop);
1753         }
1754
1755         tx_ring->next_to_clean = i;
1756
1757         spin_lock(&adapter->tx_lock);
1758         if(cleaned && netif_queue_stopped(netdev) && netif_carrier_ok(netdev) &&
1759            (IXGB_DESC_UNUSED(tx_ring) > IXGB_TX_QUEUE_WAKE)) {
1760
1761                 netif_wake_queue(netdev);
1762         }
1763         spin_unlock(&adapter->tx_lock);
1764
1765         if(adapter->detect_tx_hung) {
1766                 /* detect a transmit hang in hardware, this serializes the
1767                  * check with the clearing of time_stamp and movement of i */
1768                 adapter->detect_tx_hung = FALSE;
1769                 if(tx_ring->buffer_info[i].dma &&
1770                    time_after(jiffies, tx_ring->buffer_info[i].time_stamp + HZ)
1771                    && !(IXGB_READ_REG(&adapter->hw, STATUS) &
1772                         IXGB_STATUS_TXOFF))
1773                         netif_stop_queue(netdev);
1774         }
1775
1776         return cleaned;
1777 }
1778
1779 /**
1780  * ixgb_rx_checksum - Receive Checksum Offload for 82597.
1781  * @adapter: board private structure
1782  * @rx_desc: receive descriptor
1783  * @sk_buff: socket buffer with received data
1784  **/
1785
1786 static inline void
1787 ixgb_rx_checksum(struct ixgb_adapter *adapter,
1788                  struct ixgb_rx_desc *rx_desc,
1789                  struct sk_buff *skb)
1790 {
1791         /* Ignore Checksum bit is set OR
1792          * TCP Checksum has not been calculated
1793          */
1794         if((rx_desc->status & IXGB_RX_DESC_STATUS_IXSM) ||
1795            (!(rx_desc->status & IXGB_RX_DESC_STATUS_TCPCS))) {
1796                 skb->ip_summed = CHECKSUM_NONE;
1797                 return;
1798         }
1799
1800         /* At this point we know the hardware did the TCP checksum */
1801         /* now look at the TCP checksum error bit */
1802         if(rx_desc->errors & IXGB_RX_DESC_ERRORS_TCPE) {
1803                 /* let the stack verify checksum errors */
1804                 skb->ip_summed = CHECKSUM_NONE;
1805                 adapter->hw_csum_rx_error++;
1806         } else {
1807                 /* TCP checksum is good */
1808                 skb->ip_summed = CHECKSUM_UNNECESSARY;
1809                 adapter->hw_csum_rx_good++;
1810         }
1811 }
1812
1813 /**
1814  * ixgb_clean_rx_irq - Send received data up the network stack,
1815  * @adapter: board private structure
1816  **/
1817
1818 static boolean_t
1819 #ifdef CONFIG_IXGB_NAPI
1820 ixgb_clean_rx_irq(struct ixgb_adapter *adapter, int *work_done, int work_to_do)
1821 #else
1822 ixgb_clean_rx_irq(struct ixgb_adapter *adapter)
1823 #endif
1824 {
1825         struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
1826         struct net_device *netdev = adapter->netdev;
1827         struct pci_dev *pdev = adapter->pdev;
1828         struct ixgb_rx_desc *rx_desc, *next_rxd;
1829         struct ixgb_buffer *buffer_info, *next_buffer, *next2_buffer;
1830         uint32_t length;
1831         unsigned int i, j;
1832         boolean_t cleaned = FALSE;
1833
1834         i = rx_ring->next_to_clean;
1835         rx_desc = IXGB_RX_DESC(*rx_ring, i);
1836         buffer_info = &rx_ring->buffer_info[i];
1837
1838         while(rx_desc->status & IXGB_RX_DESC_STATUS_DD) {
1839                 struct sk_buff *skb, *next_skb;
1840                 u8 status;
1841
1842 #ifdef CONFIG_IXGB_NAPI
1843                 if(*work_done >= work_to_do)
1844                         break;
1845
1846                 (*work_done)++;
1847 #endif
1848                 status = rx_desc->status;
1849                 skb = buffer_info->skb;
1850
1851                 prefetch(skb->data);
1852
1853                 if(++i == rx_ring->count) i = 0;
1854                 next_rxd = IXGB_RX_DESC(*rx_ring, i);
1855                 prefetch(next_rxd);
1856
1857                 if((j = i + 1) == rx_ring->count) j = 0;
1858                 next2_buffer = &rx_ring->buffer_info[j];
1859                 prefetch(next2_buffer);
1860
1861                 next_buffer = &rx_ring->buffer_info[i];
1862                 next_skb = next_buffer->skb;
1863                 prefetch(next_skb);
1864
1865                 cleaned = TRUE;
1866
1867                 pci_unmap_single(pdev,
1868                                  buffer_info->dma,
1869                                  buffer_info->length,
1870                                  PCI_DMA_FROMDEVICE);
1871
1872                 length = le16_to_cpu(rx_desc->length);
1873
1874                 if(unlikely(!(status & IXGB_RX_DESC_STATUS_EOP))) {
1875
1876                         /* All receives must fit into a single buffer */
1877
1878                         IXGB_DBG("Receive packet consumed multiple buffers "
1879                                          "length<%x>\n", length);
1880
1881                         dev_kfree_skb_irq(skb);
1882                         goto rxdesc_done;
1883                 }
1884
1885                 if (unlikely(rx_desc->errors
1886                              & (IXGB_RX_DESC_ERRORS_CE | IXGB_RX_DESC_ERRORS_SE
1887                                 | IXGB_RX_DESC_ERRORS_P |
1888                                 IXGB_RX_DESC_ERRORS_RXE))) {
1889
1890                         dev_kfree_skb_irq(skb);
1891                         goto rxdesc_done;
1892                 }
1893
1894                 /* Good Receive */
1895                 skb_put(skb, length);
1896
1897                 /* Receive Checksum Offload */
1898                 ixgb_rx_checksum(adapter, rx_desc, skb);
1899
1900                 skb->protocol = eth_type_trans(skb, netdev);
1901 #ifdef CONFIG_IXGB_NAPI
1902                 if(adapter->vlgrp && (status & IXGB_RX_DESC_STATUS_VP)) {
1903                         vlan_hwaccel_receive_skb(skb, adapter->vlgrp,
1904                                 le16_to_cpu(rx_desc->special) &
1905                                         IXGB_RX_DESC_SPECIAL_VLAN_MASK);
1906                 } else {
1907                         netif_receive_skb(skb);
1908                 }
1909 #else /* CONFIG_IXGB_NAPI */
1910                 if(adapter->vlgrp && (status & IXGB_RX_DESC_STATUS_VP)) {
1911                         vlan_hwaccel_rx(skb, adapter->vlgrp,
1912                                 le16_to_cpu(rx_desc->special) &
1913                                         IXGB_RX_DESC_SPECIAL_VLAN_MASK);
1914                 } else {
1915                         netif_rx(skb);
1916                 }
1917 #endif /* CONFIG_IXGB_NAPI */
1918                 netdev->last_rx = jiffies;
1919
1920 rxdesc_done:
1921                 /* clean up descriptor, might be written over by hw */
1922                 rx_desc->status = 0;
1923                 buffer_info->skb = NULL;
1924
1925                 /* use prefetched values */
1926                 rx_desc = next_rxd;
1927                 buffer_info = next_buffer;
1928         }
1929
1930         rx_ring->next_to_clean = i;
1931
1932         ixgb_alloc_rx_buffers(adapter);
1933
1934         return cleaned;
1935 }
1936
1937 /**
1938  * ixgb_alloc_rx_buffers - Replace used receive buffers
1939  * @adapter: address of board private structure
1940  **/
1941
1942 static void
1943 ixgb_alloc_rx_buffers(struct ixgb_adapter *adapter)
1944 {
1945         struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
1946         struct net_device *netdev = adapter->netdev;
1947         struct pci_dev *pdev = adapter->pdev;
1948         struct ixgb_rx_desc *rx_desc;
1949         struct ixgb_buffer *buffer_info;
1950         struct sk_buff *skb;
1951         unsigned int i;
1952         int num_group_tail_writes;
1953         long cleancount;
1954
1955         i = rx_ring->next_to_use;
1956         buffer_info = &rx_ring->buffer_info[i];
1957         cleancount = IXGB_DESC_UNUSED(rx_ring);
1958
1959         num_group_tail_writes = IXGB_RX_BUFFER_WRITE;
1960
1961         /* leave three descriptors unused */
1962         while(--cleancount > 2) {
1963                 rx_desc = IXGB_RX_DESC(*rx_ring, i);
1964
1965                 skb = dev_alloc_skb(adapter->rx_buffer_len + NET_IP_ALIGN);
1966
1967                 if(unlikely(!skb)) {
1968                         /* Better luck next round */
1969                         break;
1970                 }
1971
1972                 /* Make buffer alignment 2 beyond a 16 byte boundary
1973                  * this will result in a 16 byte aligned IP header after
1974                  * the 14 byte MAC header is removed
1975                  */
1976                 skb_reserve(skb, NET_IP_ALIGN);
1977
1978                 skb->dev = netdev;
1979
1980                 buffer_info->skb = skb;
1981                 buffer_info->length = adapter->rx_buffer_len;
1982                 buffer_info->dma =
1983                         pci_map_single(pdev,
1984                                    skb->data,
1985                                    adapter->rx_buffer_len,
1986                                    PCI_DMA_FROMDEVICE);
1987
1988                 rx_desc->buff_addr = cpu_to_le64(buffer_info->dma);
1989                 /* guarantee DD bit not set now before h/w gets descriptor
1990                  * this is the rest of the workaround for h/w double
1991                  * writeback. */
1992                 rx_desc->status = 0;
1993
1994                 if((i & ~(num_group_tail_writes- 1)) == i) {
1995                         /* Force memory writes to complete before letting h/w
1996                          * know there are new descriptors to fetch.  (Only
1997                          * applicable for weak-ordered memory model archs,
1998                          * such as IA-64). */
1999                         wmb();
2000
2001                         IXGB_WRITE_REG(&adapter->hw, RDT, i);
2002                 }
2003
2004                 if(++i == rx_ring->count) i = 0;
2005                 buffer_info = &rx_ring->buffer_info[i];
2006         }
2007
2008         rx_ring->next_to_use = i;
2009 }
2010
2011 /**
2012  * ixgb_vlan_rx_register - enables or disables vlan tagging/stripping.
2013  *
2014  * @param netdev network interface device structure
2015  * @param grp indicates to enable or disable tagging/stripping
2016  **/
2017 static void
2018 ixgb_vlan_rx_register(struct net_device *netdev, struct vlan_group *grp)
2019 {
2020         struct ixgb_adapter *adapter = netdev->priv;
2021         uint32_t ctrl, rctl;
2022
2023         ixgb_irq_disable(adapter);
2024         adapter->vlgrp = grp;
2025
2026         if(grp) {
2027                 /* enable VLAN tag insert/strip */
2028                 ctrl = IXGB_READ_REG(&adapter->hw, CTRL0);
2029                 ctrl |= IXGB_CTRL0_VME;
2030                 IXGB_WRITE_REG(&adapter->hw, CTRL0, ctrl);
2031
2032                 /* enable VLAN receive filtering */
2033
2034                 rctl = IXGB_READ_REG(&adapter->hw, RCTL);
2035                 rctl |= IXGB_RCTL_VFE;
2036                 rctl &= ~IXGB_RCTL_CFIEN;
2037                 IXGB_WRITE_REG(&adapter->hw, RCTL, rctl);
2038         } else {
2039                 /* disable VLAN tag insert/strip */
2040
2041                 ctrl = IXGB_READ_REG(&adapter->hw, CTRL0);
2042                 ctrl &= ~IXGB_CTRL0_VME;
2043                 IXGB_WRITE_REG(&adapter->hw, CTRL0, ctrl);
2044
2045                 /* disable VLAN filtering */
2046
2047                 rctl = IXGB_READ_REG(&adapter->hw, RCTL);
2048                 rctl &= ~IXGB_RCTL_VFE;
2049                 IXGB_WRITE_REG(&adapter->hw, RCTL, rctl);
2050         }
2051
2052         ixgb_irq_enable(adapter);
2053 }
2054
2055 static void
2056 ixgb_vlan_rx_add_vid(struct net_device *netdev, uint16_t vid)
2057 {
2058         struct ixgb_adapter *adapter = netdev->priv;
2059         uint32_t vfta, index;
2060
2061         /* add VID to filter table */
2062
2063         index = (vid >> 5) & 0x7F;
2064         vfta = IXGB_READ_REG_ARRAY(&adapter->hw, VFTA, index);
2065         vfta |= (1 << (vid & 0x1F));
2066         ixgb_write_vfta(&adapter->hw, index, vfta);
2067 }
2068
2069 static void
2070 ixgb_vlan_rx_kill_vid(struct net_device *netdev, uint16_t vid)
2071 {
2072         struct ixgb_adapter *adapter = netdev->priv;
2073         uint32_t vfta, index;
2074
2075         ixgb_irq_disable(adapter);
2076
2077         if(adapter->vlgrp)
2078                 adapter->vlgrp->vlan_devices[vid] = NULL;
2079
2080         ixgb_irq_enable(adapter);
2081
2082         /* remove VID from filter table*/
2083
2084         index = (vid >> 5) & 0x7F;
2085         vfta = IXGB_READ_REG_ARRAY(&adapter->hw, VFTA, index);
2086         vfta &= ~(1 << (vid & 0x1F));
2087         ixgb_write_vfta(&adapter->hw, index, vfta);
2088 }
2089
2090 static void
2091 ixgb_restore_vlan(struct ixgb_adapter *adapter)
2092 {
2093         ixgb_vlan_rx_register(adapter->netdev, adapter->vlgrp);
2094
2095         if(adapter->vlgrp) {
2096                 uint16_t vid;
2097                 for(vid = 0; vid < VLAN_GROUP_ARRAY_LEN; vid++) {
2098                         if(!adapter->vlgrp->vlan_devices[vid])
2099                                 continue;
2100                         ixgb_vlan_rx_add_vid(adapter->netdev, vid);
2101                 }
2102         }
2103 }
2104
2105 #ifdef CONFIG_NET_POLL_CONTROLLER
2106 /*
2107  * Polling 'interrupt' - used by things like netconsole to send skbs
2108  * without having to re-enable interrupts. It's not called while
2109  * the interrupt routine is executing.
2110  */
2111
2112 static void ixgb_netpoll(struct net_device *dev)
2113 {
2114         struct ixgb_adapter *adapter = dev->priv;
2115
2116         disable_irq(adapter->pdev->irq);
2117         ixgb_intr(adapter->pdev->irq, dev, NULL);
2118         enable_irq(adapter->pdev->irq);
2119 }
2120 #endif
2121
2122 /* ixgb_main.c */