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