git.oblomov.eu Git - linux-2.6/blob - drivers/net/ixgb/ixgb_main.c

   1 /*******************************************************************************
   2
   3
   4   Copyright(c) 1999 - 2005 Intel Corporation. All rights reserved.
   5
   6   This program is free software; you can redistribute it and/or modify it
   7   under the terms of the GNU General Public License as published by the Free
   8   Software Foundation; either version 2 of the License, or (at your option)
   9   any later version.
  10
  11   This program is distributed in the hope that it will be useful, but WITHOUT
  12   ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13   FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  14   more details.
  15
  16   You should have received a copy of the GNU General Public License along with
  17   this program; if not, write to the Free Software Foundation, Inc., 59
  18   Temple Place - Suite 330, Boston, MA  02111-1307, USA.
  19
  20   The full GNU General Public License is included in this distribution in the
  21   file called LICENSE.
  22
  23   Contact Information:
  24   Linux NICS <linux.nics@intel.com>
  25   Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
  26
  27 *******************************************************************************/
  28
  29 #include "ixgb.h"
  30
  31 /* Change Log
  32  * 1.0.88 01/05/05
  33  * - include fix to the condition that determines when to quit NAPI - Robert Olsson
  34  * - use netif_poll_{disable/enable} to synchronize between NAPI and i/f up/down
  35  * 1.0.84 10/26/04
  36  * - reset buffer_info->dma in Tx resource cleanup logic
  37  * 1.0.83 10/12/04
  38  * - sparse cleanup - shemminger@osdl.org
  39  * - fix tx resource cleanup logic
  40  */
  41
  42 char ixgb_driver_name[] = "ixgb";
  43 char ixgb_driver_string[] = "Intel(R) PRO/10GbE Network Driver";
  44
  45 #ifndef CONFIG_IXGB_NAPI
  46 #define DRIVERNAPI
  47 #else
  48 #define DRIVERNAPI "-NAPI"
  49 #endif
  50 char ixgb_driver_version[] = "1.0.90-k2"DRIVERNAPI;
  51 char ixgb_copyright[] = "Copyright (c) 1999-2005 Intel Corporation.";
  52
  53 /* ixgb_pci_tbl - PCI Device ID Table
  54  *
  55  * Wildcard entries (PCI_ANY_ID) should come last
  56  * Last entry must be all 0s
  57  *
  58  * { Vendor ID, Device ID, SubVendor ID, SubDevice ID,
  59  *   Class, Class Mask, private data (not used) }
  60  */
  61 static struct pci_device_id ixgb_pci_tbl[] = {
  62         {INTEL_VENDOR_ID, IXGB_DEVICE_ID_82597EX,
  63          PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
  64         {INTEL_VENDOR_ID, IXGB_DEVICE_ID_82597EX_SR,
  65          PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
  66         {INTEL_VENDOR_ID, IXGB_DEVICE_ID_82597EX_LR,
  67          PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
  68
  69         /* required last entry */
  70         {0,}
  71 };
  72
  73 MODULE_DEVICE_TABLE(pci, ixgb_pci_tbl);
  74
  75 /* Local Function Prototypes */
  76
  77 int ixgb_up(struct ixgb_adapter *adapter);
  78 void ixgb_down(struct ixgb_adapter *adapter, boolean_t kill_watchdog);
  79 void ixgb_reset(struct ixgb_adapter *adapter);
  80 int ixgb_setup_tx_resources(struct ixgb_adapter *adapter);
  81 int ixgb_setup_rx_resources(struct ixgb_adapter *adapter);
  82 void ixgb_free_tx_resources(struct ixgb_adapter *adapter);
  83 void ixgb_free_rx_resources(struct ixgb_adapter *adapter);
  84 void ixgb_update_stats(struct ixgb_adapter *adapter);
  85
  86 static int ixgb_init_module(void);
  87 static void ixgb_exit_module(void);
  88 static int ixgb_probe(struct pci_dev *pdev, const struct pci_device_id *ent);
  89 static void __devexit ixgb_remove(struct pci_dev *pdev);
  90 static int ixgb_sw_init(struct ixgb_adapter *adapter);
  91 static int ixgb_open(struct net_device *netdev);
  92 static int ixgb_close(struct net_device *netdev);
  93 static void ixgb_configure_tx(struct ixgb_adapter *adapter);
  94 static void ixgb_configure_rx(struct ixgb_adapter *adapter);
  95 static void ixgb_setup_rctl(struct ixgb_adapter *adapter);
  96 static void ixgb_clean_tx_ring(struct ixgb_adapter *adapter);
  97 static void ixgb_clean_rx_ring(struct ixgb_adapter *adapter);
  98 static void ixgb_set_multi(struct net_device *netdev);
  99 static void ixgb_watchdog(unsigned long data);
 100 static int ixgb_xmit_frame(struct sk_buff *skb, struct net_device *netdev);
 101 static struct net_device_stats *ixgb_get_stats(struct net_device *netdev);
 102 static int ixgb_change_mtu(struct net_device *netdev, int new_mtu);
 103 static int ixgb_set_mac(struct net_device *netdev, void *p);
 104 static irqreturn_t ixgb_intr(int irq, void *data, struct pt_regs *regs);
 105 static boolean_t ixgb_clean_tx_irq(struct ixgb_adapter *adapter);
 106 #ifdef CONFIG_IXGB_NAPI
 107 static int ixgb_clean(struct net_device *netdev, int *budget);
 108 static boolean_t ixgb_clean_rx_irq(struct ixgb_adapter *adapter,
 109                                    int *work_done, int work_to_do);
 110 #else
 111 static boolean_t ixgb_clean_rx_irq(struct ixgb_adapter *adapter);
 112 #endif
 113 static void ixgb_alloc_rx_buffers(struct ixgb_adapter *adapter);
 114 void ixgb_set_ethtool_ops(struct net_device *netdev);
 115 static void ixgb_tx_timeout(struct net_device *dev);
 116 static void ixgb_tx_timeout_task(struct net_device *dev);
 117 static void ixgb_vlan_rx_register(struct net_device *netdev,
 118                                   struct vlan_group *grp);
 119 static void ixgb_vlan_rx_add_vid(struct net_device *netdev, uint16_t vid);
 120 static void ixgb_vlan_rx_kill_vid(struct net_device *netdev, uint16_t vid);
 121 static void ixgb_restore_vlan(struct ixgb_adapter *adapter);
 122
 123 #ifdef CONFIG_NET_POLL_CONTROLLER
 124 /* for netdump / net console */
 125 static void ixgb_netpoll(struct net_device *dev);
 126 #endif
 127
 128 /* Exported from other modules */
 129
 130 extern void ixgb_check_options(struct ixgb_adapter *adapter);
 131
 132 static struct pci_driver ixgb_driver = {
 133         .name     = ixgb_driver_name,
 134         .id_table = ixgb_pci_tbl,
 135         .probe    = ixgb_probe,
 136         .remove   = __devexit_p(ixgb_remove),
 137 };
 138
 139 MODULE_AUTHOR("Intel Corporation, <linux.nics@intel.com>");
 140 MODULE_DESCRIPTION("Intel(R) PRO/10GbE Network Driver");
 141 MODULE_LICENSE("GPL");
 142
 143 /* some defines for controlling descriptor fetches in h/w */
 144 #define RXDCTL_PTHRESH_DEFAULT 128      /* chip considers prefech below this */
 145 #define RXDCTL_HTHRESH_DEFAULT 16       /* chip will only prefetch if tail is
 146                                            pushed this many descriptors from head */
 147 #define RXDCTL_WTHRESH_DEFAULT 16       /* chip writes back at this many or RXT0 */
 148
 149 /**
 150  * ixgb_init_module - Driver Registration Routine
 151  *
 152  * ixgb_init_module is the first routine called when the driver is
 153  * loaded. All it does is register with the PCI subsystem.
 154  **/
 155
 156 static int __init
 157 ixgb_init_module(void)
 158 {
 159         printk(KERN_INFO "%s - version %s\n",
 160                ixgb_driver_string, ixgb_driver_version);
 161
 162         printk(KERN_INFO "%s\n", ixgb_copyright);
 163
 164         return pci_module_init(&ixgb_driver);
 165 }
 166
 167 module_init(ixgb_init_module);
 168
 169 /**
 170  * ixgb_exit_module - Driver Exit Cleanup Routine
 171  *
 172  * ixgb_exit_module is called just before the driver is removed
 173  * from memory.
 174  **/
 175
 176 static void __exit
 177 ixgb_exit_module(void)
 178 {
 179         pci_unregister_driver(&ixgb_driver);
 180 }
 181
 182 module_exit(ixgb_exit_module);
 183
 184 /**
 185  * ixgb_irq_disable - Mask off interrupt generation on the NIC
 186  * @adapter: board private structure
 187  **/
 188
 189 static inline void
 190 ixgb_irq_disable(struct ixgb_adapter *adapter)
 191 {
 192         atomic_inc(&adapter->irq_sem);
 193         IXGB_WRITE_REG(&adapter->hw, IMC, ~0);
 194         IXGB_WRITE_FLUSH(&adapter->hw);
 195         synchronize_irq(adapter->pdev->irq);
 196 }
 197
 198 /**
 199  * ixgb_irq_enable - Enable default interrupt generation settings
 200  * @adapter: board private structure
 201  **/
 202
 203 static inline void
 204 ixgb_irq_enable(struct ixgb_adapter *adapter)
 205 {
 206         if(atomic_dec_and_test(&adapter->irq_sem)) {
 207                 IXGB_WRITE_REG(&adapter->hw, IMS,
 208                                IXGB_INT_RXT0 | IXGB_INT_RXDMT0 | IXGB_INT_TXDW |
 209                                IXGB_INT_LSC);
 210                 IXGB_WRITE_FLUSH(&adapter->hw);
 211         }
 212 }
 213
 214 int
 215 ixgb_up(struct ixgb_adapter *adapter)
 216 {
 217         struct net_device *netdev = adapter->netdev;
 218         int err;
 219         int max_frame = netdev->mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;
 220         struct ixgb_hw *hw = &adapter->hw;
 221
 222         /* hardware has been reset, we need to reload some things */
 223
 224         ixgb_set_multi(netdev);
 225
 226         ixgb_restore_vlan(adapter);
 227
 228         ixgb_configure_tx(adapter);
 229         ixgb_setup_rctl(adapter);
 230         ixgb_configure_rx(adapter);
 231         ixgb_alloc_rx_buffers(adapter);
 232
 233 #ifdef CONFIG_PCI_MSI
 234         {
 235         boolean_t pcix = (IXGB_READ_REG(&adapter->hw, STATUS) &
 236                                                   IXGB_STATUS_PCIX_MODE) ? TRUE : FALSE;
 237         adapter->have_msi = TRUE;
 238
 239         if (!pcix)
 240            adapter->have_msi = FALSE;
 241         else if((err = pci_enable_msi(adapter->pdev))) {
 242                 printk (KERN_ERR
 243                  "Unable to allocate MSI interrupt Error: %d\n", err);
 244                 adapter->have_msi = FALSE;
 245                 /* proceed to try to request regular interrupt */
 246         }
 247         }
 248
 249 #endif
 250         if((err = request_irq(adapter->pdev->irq, &ixgb_intr,
 251                                   SA_SHIRQ | SA_SAMPLE_RANDOM,
 252                                   netdev->name, netdev)))
 253                 return err;
 254
 255         /* disable interrupts and get the hardware into a known state */
 256         IXGB_WRITE_REG(&adapter->hw, IMC, 0xffffffff);
 257
 258         if((hw->max_frame_size != max_frame) ||
 259                 (hw->max_frame_size !=
 260                 (IXGB_READ_REG(hw, MFS) >> IXGB_MFS_SHIFT))) {
 261
 262                 hw->max_frame_size = max_frame;
 263
 264                 IXGB_WRITE_REG(hw, MFS, hw->max_frame_size << IXGB_MFS_SHIFT);
 265
 266                 if(hw->max_frame_size >
 267                    IXGB_MAX_ENET_FRAME_SIZE_WITHOUT_FCS + ENET_FCS_LENGTH) {
 268                         uint32_t ctrl0 = IXGB_READ_REG(hw, CTRL0);
 269
 270                         if(!(ctrl0 & IXGB_CTRL0_JFE)) {
 271                                 ctrl0 |= IXGB_CTRL0_JFE;
 272                                 IXGB_WRITE_REG(hw, CTRL0, ctrl0);
 273                         }
 274                 }
 275         }
 276
 277         mod_timer(&adapter->watchdog_timer, jiffies);
 278         ixgb_irq_enable(adapter);
 279
 280 #ifdef CONFIG_IXGB_NAPI
 281         netif_poll_enable(netdev);
 282 #endif
 283         return 0;
 284 }
 285
 286 void
 287 ixgb_down(struct ixgb_adapter *adapter, boolean_t kill_watchdog)
 288 {
 289         struct net_device *netdev = adapter->netdev;
 290
 291         ixgb_irq_disable(adapter);
 292         free_irq(adapter->pdev->irq, netdev);
 293 #ifdef CONFIG_PCI_MSI
 294         if(adapter->have_msi == TRUE)
 295                 pci_disable_msi(adapter->pdev);
 296
 297 #endif
 298         if(kill_watchdog)
 299                 del_timer_sync(&adapter->watchdog_timer);
 300 #ifdef CONFIG_IXGB_NAPI
 301         netif_poll_disable(netdev);
 302 #endif
 303         adapter->link_speed = 0;
 304         adapter->link_duplex = 0;
 305         netif_carrier_off(netdev);
 306         netif_stop_queue(netdev);
 307
 308         ixgb_reset(adapter);
 309         ixgb_clean_tx_ring(adapter);
 310         ixgb_clean_rx_ring(adapter);
 311 }
 312
 313 void
 314 ixgb_reset(struct ixgb_adapter *adapter)
 315 {
 316
 317         ixgb_adapter_stop(&adapter->hw);
 318         if(!ixgb_init_hw(&adapter->hw))
 319                 IXGB_DBG("ixgb_init_hw failed.\n");
 320 }
 321
 322 /**
 323  * ixgb_probe - Device Initialization Routine
 324  * @pdev: PCI device information struct
 325  * @ent: entry in ixgb_pci_tbl
 326  *
 327  * Returns 0 on success, negative on failure
 328  *
 329  * ixgb_probe initializes an adapter identified by a pci_dev structure.
 330  * The OS initialization, configuring of the adapter private structure,
 331  * and a hardware reset occur.
 332  **/
 333
 334 static int __devinit
 335 ixgb_probe(struct pci_dev *pdev,
 336                 const struct pci_device_id *ent)
 337 {
 338         struct net_device *netdev = NULL;
 339         struct ixgb_adapter *adapter;
 340         static int cards_found = 0;
 341         unsigned long mmio_start;
 342         int mmio_len;
 343         int pci_using_dac;
 344         int i;
 345         int err;
 346
 347         if((err = pci_enable_device(pdev)))
 348                 return err;
 349
 350         if(!(err = pci_set_dma_mask(pdev, DMA_64BIT_MASK))) {
 351                 pci_using_dac = 1;
 352         } else {
 353                 if((err = pci_set_dma_mask(pdev, DMA_32BIT_MASK))) {
 354                         IXGB_ERR("No usable DMA configuration, aborting\n");
 355                         return err;
 356                 }
 357                 pci_using_dac = 0;
 358         }
 359
 360         if((err = pci_request_regions(pdev, ixgb_driver_name)))
 361                 return err;
 362
 363         pci_set_master(pdev);
 364
 365         netdev = alloc_etherdev(sizeof(struct ixgb_adapter));
 366         if(!netdev) {
 367                 err = -ENOMEM;
 368                 goto err_alloc_etherdev;
 369         }
 370
 371         SET_MODULE_OWNER(netdev);
 372         SET_NETDEV_DEV(netdev, &pdev->dev);
 373
 374         pci_set_drvdata(pdev, netdev);
 375         adapter = netdev->priv;
 376         adapter->netdev = netdev;
 377         adapter->pdev = pdev;
 378         adapter->hw.back = adapter;
 379
 380         mmio_start = pci_resource_start(pdev, BAR_0);
 381         mmio_len = pci_resource_len(pdev, BAR_0);
 382
 383         adapter->hw.hw_addr = ioremap(mmio_start, mmio_len);
 384         if(!adapter->hw.hw_addr) {
 385                 err = -EIO;
 386                 goto err_ioremap;
 387         }
 388
 389         for(i = BAR_1; i <= BAR_5; i++) {
 390                 if(pci_resource_len(pdev, i) == 0)
 391                         continue;
 392                 if(pci_resource_flags(pdev, i) & IORESOURCE_IO) {
 393                         adapter->hw.io_base = pci_resource_start(pdev, i);
 394                         break;
 395                 }
 396         }
 397
 398         netdev->open = &ixgb_open;
 399         netdev->stop = &ixgb_close;
 400         netdev->hard_start_xmit = &ixgb_xmit_frame;
 401         netdev->get_stats = &ixgb_get_stats;
 402         netdev->set_multicast_list = &ixgb_set_multi;
 403         netdev->set_mac_address = &ixgb_set_mac;
 404         netdev->change_mtu = &ixgb_change_mtu;
 405         ixgb_set_ethtool_ops(netdev);
 406         netdev->tx_timeout = &ixgb_tx_timeout;
 407         netdev->watchdog_timeo = HZ;
 408 #ifdef CONFIG_IXGB_NAPI
 409         netdev->poll = &ixgb_clean;
 410         netdev->weight = 64;
 411 #endif
 412         netdev->vlan_rx_register = ixgb_vlan_rx_register;
 413         netdev->vlan_rx_add_vid = ixgb_vlan_rx_add_vid;
 414         netdev->vlan_rx_kill_vid = ixgb_vlan_rx_kill_vid;
 415 #ifdef CONFIG_NET_POLL_CONTROLLER
 416         netdev->poll_controller = ixgb_netpoll;
 417 #endif
 418
 419         netdev->mem_start = mmio_start;
 420         netdev->mem_end = mmio_start + mmio_len;
 421         netdev->base_addr = adapter->hw.io_base;
 422
 423         adapter->bd_number = cards_found;
 424         adapter->link_speed = 0;
 425         adapter->link_duplex = 0;
 426
 427         /* setup the private structure */
 428
 429         if((err = ixgb_sw_init(adapter)))
 430                 goto err_sw_init;
 431
 432         netdev->features = NETIF_F_SG |
 433                            NETIF_F_HW_CSUM |
 434                            NETIF_F_HW_VLAN_TX |
 435                            NETIF_F_HW_VLAN_RX |
 436                            NETIF_F_HW_VLAN_FILTER;
 437 #ifdef NETIF_F_TSO
 438         netdev->features |= NETIF_F_TSO;
 439 #endif
 440
 441         if(pci_using_dac)
 442                 netdev->features |= NETIF_F_HIGHDMA;
 443
 444         /* make sure the EEPROM is good */
 445
 446         if(!ixgb_validate_eeprom_checksum(&adapter->hw)) {
 447                 printk(KERN_ERR "The EEPROM Checksum Is Not Valid\n");
 448                 err = -EIO;
 449                 goto err_eeprom;
 450         }
 451
 452         ixgb_get_ee_mac_addr(&adapter->hw, netdev->dev_addr);
 453
 454         if(!is_valid_ether_addr(netdev->dev_addr)) {
 455                 err = -EIO;
 456                 goto err_eeprom;
 457         }
 458
 459         adapter->part_num = ixgb_get_ee_pba_number(&adapter->hw);
 460
 461         init_timer(&adapter->watchdog_timer);
 462         adapter->watchdog_timer.function = &ixgb_watchdog;
 463         adapter->watchdog_timer.data = (unsigned long)adapter;
 464
 465         INIT_WORK(&adapter->tx_timeout_task,
 466                   (void (*)(void *))ixgb_tx_timeout_task, netdev);
 467
 468         if((err = register_netdev(netdev)))
 469                 goto err_register;
 470
 471         /* we're going to reset, so assume we have no link for now */
 472
 473         netif_carrier_off(netdev);
 474         netif_stop_queue(netdev);
 475
 476         printk(KERN_INFO "%s: Intel(R) PRO/10GbE Network Connection\n",
 477                    netdev->name);
 478         ixgb_check_options(adapter);
 479         /* reset the hardware with the new settings */
 480
 481         ixgb_reset(adapter);
 482
 483         cards_found++;
 484         return 0;
 485
 486 err_register:
 487 err_sw_init:
 488 err_eeprom:
 489         iounmap(adapter->hw.hw_addr);
 490 err_ioremap:
 491         free_netdev(netdev);
 492 err_alloc_etherdev:
 493         pci_release_regions(pdev);
 494         return err;
 495 }
 496
 497 /**
 498  * ixgb_remove - Device Removal Routine
 499  * @pdev: PCI device information struct
 500  *
 501  * ixgb_remove is called by the PCI subsystem to alert the driver
 502  * that it should release a PCI device.  The could be caused by a
 503  * Hot-Plug event, or because the driver is going to be removed from
 504  * memory.
 505  **/
 506
 507 static void __devexit
 508 ixgb_remove(struct pci_dev *pdev)
 509 {
 510         struct net_device *netdev = pci_get_drvdata(pdev);
 511         struct ixgb_adapter *adapter = netdev->priv;
 512
 513         unregister_netdev(netdev);
 514
 515         iounmap(adapter->hw.hw_addr);
 516         pci_release_regions(pdev);
 517
 518         free_netdev(netdev);
 519 }
 520
 521 /**
 522  * ixgb_sw_init - Initialize general software structures (struct ixgb_adapter)
 523  * @adapter: board private structure to initialize
 524  *
 525  * ixgb_sw_init initializes the Adapter private data structure.
 526  * Fields are initialized based on PCI device information and
 527  * OS network device settings (MTU size).
 528  **/
 529
 530 static int __devinit
 531 ixgb_sw_init(struct ixgb_adapter *adapter)
 532 {
 533         struct ixgb_hw *hw = &adapter->hw;
 534         struct net_device *netdev = adapter->netdev;
 535         struct pci_dev *pdev = adapter->pdev;
 536
 537         /* PCI config space info */
 538
 539         hw->vendor_id = pdev->vendor;
 540         hw->device_id = pdev->device;
 541         hw->subsystem_vendor_id = pdev->subsystem_vendor;
 542         hw->subsystem_id = pdev->subsystem_device;
 543
 544         adapter->rx_buffer_len = IXGB_RXBUFFER_2048;
 545
 546         hw->max_frame_size = netdev->mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;
 547
 548         if((hw->device_id == IXGB_DEVICE_ID_82597EX)
 549            ||(hw->device_id == IXGB_DEVICE_ID_82597EX_LR)
 550            ||(hw->device_id == IXGB_DEVICE_ID_82597EX_SR))
 551                         hw->mac_type = ixgb_82597;
 552         else {
 553                 /* should never have loaded on this device */
 554                 printk(KERN_ERR "ixgb: unsupported device id\n");
 555         }
 556
 557         /* enable flow control to be programmed */
 558         hw->fc.send_xon = 1;
 559
 560         atomic_set(&adapter->irq_sem, 1);
 561         spin_lock_init(&adapter->tx_lock);
 562
 563         return 0;
 564 }
 565
 566 /**
 567  * ixgb_open - Called when a network interface is made active
 568  * @netdev: network interface device structure
 569  *
 570  * Returns 0 on success, negative value on failure
 571  *
 572  * The open entry point is called when a network interface is made
 573  * active by the system (IFF_UP).  At this point all resources needed
 574  * for transmit and receive operations are allocated, the interrupt
 575  * handler is registered with the OS, the watchdog timer is started,
 576  * and the stack is notified that the interface is ready.
 577  **/
 578
 579 static int
 580 ixgb_open(struct net_device *netdev)
 581 {
 582         struct ixgb_adapter *adapter = netdev->priv;
 583         int err;
 584
 585         /* allocate transmit descriptors */
 586
 587         if((err = ixgb_setup_tx_resources(adapter)))
 588                 goto err_setup_tx;
 589
 590         /* allocate receive descriptors */
 591
 592         if((err = ixgb_setup_rx_resources(adapter)))
 593                 goto err_setup_rx;
 594
 595         if((err = ixgb_up(adapter)))
 596                 goto err_up;
 597
 598         return 0;
 599
 600 err_up:
 601         ixgb_free_rx_resources(adapter);
 602 err_setup_rx:
 603         ixgb_free_tx_resources(adapter);
 604 err_setup_tx:
 605         ixgb_reset(adapter);
 606
 607         return err;
 608 }
 609
 610 /**
 611  * ixgb_close - Disables a network interface
 612  * @netdev: network interface device structure
 613  *
 614  * Returns 0, this is not allowed to fail
 615  *
 616  * The close entry point is called when an interface is de-activated
 617  * by the OS.  The hardware is still under the drivers control, but
 618  * needs to be disabled.  A global MAC reset is issued to stop the
 619  * hardware, and all transmit and receive resources are freed.
 620  **/
 621
 622 static int
 623 ixgb_close(struct net_device *netdev)
 624 {
 625         struct ixgb_adapter *adapter = netdev->priv;
 626
 627         ixgb_down(adapter, TRUE);
 628
 629         ixgb_free_tx_resources(adapter);
 630         ixgb_free_rx_resources(adapter);
 631
 632         return 0;
 633 }
 634
 635 /**
 636  * ixgb_setup_tx_resources - allocate Tx resources (Descriptors)
 637  * @adapter: board private structure
 638  *
 639  * Return 0 on success, negative on failure
 640  **/
 641
 642 int
 643 ixgb_setup_tx_resources(struct ixgb_adapter *adapter)
 644 {
 645         struct ixgb_desc_ring *txdr = &adapter->tx_ring;
 646         struct pci_dev *pdev = adapter->pdev;
 647         int size;
 648
 649         size = sizeof(struct ixgb_buffer) * txdr->count;
 650         txdr->buffer_info = vmalloc(size);
 651         if(!txdr->buffer_info) {
 652                 return -ENOMEM;
 653         }
 654         memset(txdr->buffer_info, 0, size);
 655
 656         /* round up to nearest 4K */
 657
 658         txdr->size = txdr->count * sizeof(struct ixgb_tx_desc);
 659         IXGB_ROUNDUP(txdr->size, 4096);
 660
 661         txdr->desc = pci_alloc_consistent(pdev, txdr->size, &txdr->dma);
 662         if(!txdr->desc) {
 663                 vfree(txdr->buffer_info);
 664                 return -ENOMEM;
 665         }
 666         memset(txdr->desc, 0, txdr->size);
 667
 668         txdr->next_to_use = 0;
 669         txdr->next_to_clean = 0;
 670
 671         return 0;
 672 }
 673
 674 /**
 675  * ixgb_configure_tx - Configure 82597 Transmit Unit after Reset.
 676  * @adapter: board private structure
 677  *
 678  * Configure the Tx unit of the MAC after a reset.
 679  **/
 680
 681 static void
 682 ixgb_configure_tx(struct ixgb_adapter *adapter)
 683 {
 684         uint64_t tdba = adapter->tx_ring.dma;
 685         uint32_t tdlen = adapter->tx_ring.count * sizeof(struct ixgb_tx_desc);
 686         uint32_t tctl;
 687         struct ixgb_hw *hw = &adapter->hw;
 688
 689         /* Setup the Base and Length of the Tx Descriptor Ring
 690          * tx_ring.dma can be either a 32 or 64 bit value
 691          */
 692
 693         IXGB_WRITE_REG(hw, TDBAL, (tdba & 0x00000000ffffffffULL));
 694         IXGB_WRITE_REG(hw, TDBAH, (tdba >> 32));
 695
 696         IXGB_WRITE_REG(hw, TDLEN, tdlen);
 697
 698         /* Setup the HW Tx Head and Tail descriptor pointers */
 699
 700         IXGB_WRITE_REG(hw, TDH, 0);
 701         IXGB_WRITE_REG(hw, TDT, 0);
 702
 703         /* don't set up txdctl, it induces performance problems if configured
 704          * incorrectly */
 705         /* Set the Tx Interrupt Delay register */
 706
 707         IXGB_WRITE_REG(hw, TIDV, adapter->tx_int_delay);
 708
 709         /* Program the Transmit Control Register */
 710
 711         tctl = IXGB_TCTL_TCE | IXGB_TCTL_TXEN | IXGB_TCTL_TPDE;
 712         IXGB_WRITE_REG(hw, TCTL, tctl);
 713
 714         /* Setup Transmit Descriptor Settings for this adapter */
 715         adapter->tx_cmd_type =
 716                 IXGB_TX_DESC_TYPE
 717                 | (adapter->tx_int_delay_enable ? IXGB_TX_DESC_CMD_IDE : 0);
 718 }
 719
 720 /**
 721  * ixgb_setup_rx_resources - allocate Rx resources (Descriptors)
 722  * @adapter: board private structure
 723  *
 724  * Returns 0 on success, negative on failure
 725  **/
 726
 727 int
 728 ixgb_setup_rx_resources(struct ixgb_adapter *adapter)
 729 {
 730         struct ixgb_desc_ring *rxdr = &adapter->rx_ring;
 731         struct pci_dev *pdev = adapter->pdev;
 732         int size;
 733
 734         size = sizeof(struct ixgb_buffer) * rxdr->count;
 735         rxdr->buffer_info = vmalloc(size);
 736         if(!rxdr->buffer_info) {
 737                 return -ENOMEM;
 738         }
 739         memset(rxdr->buffer_info, 0, size);
 740
 741         /* Round up to nearest 4K */
 742
 743         rxdr->size = rxdr->count * sizeof(struct ixgb_rx_desc);
 744         IXGB_ROUNDUP(rxdr->size, 4096);
 745
 746         rxdr->desc = pci_alloc_consistent(pdev, rxdr->size, &rxdr->dma);
 747
 748         if(!rxdr->desc) {
 749                 vfree(rxdr->buffer_info);
 750                 return -ENOMEM;
 751         }
 752         memset(rxdr->desc, 0, rxdr->size);
 753
 754         rxdr->next_to_clean = 0;
 755         rxdr->next_to_use = 0;
 756
 757         return 0;
 758 }
 759
 760 /**
 761  * ixgb_setup_rctl - configure the receive control register
 762  * @adapter: Board private structure
 763  **/
 764
 765 static void
 766 ixgb_setup_rctl(struct ixgb_adapter *adapter)
 767 {
 768         uint32_t rctl;
 769
 770         rctl = IXGB_READ_REG(&adapter->hw, RCTL);
 771
 772         rctl &= ~(3 << IXGB_RCTL_MO_SHIFT);
 773
 774         rctl |=
 775                 IXGB_RCTL_BAM | IXGB_RCTL_RDMTS_1_2 |
 776                 IXGB_RCTL_RXEN | IXGB_RCTL_CFF |
 777                 (adapter->hw.mc_filter_type << IXGB_RCTL_MO_SHIFT);
 778
 779         rctl |= IXGB_RCTL_SECRC;
 780
 781         switch (adapter->rx_buffer_len) {
 782         case IXGB_RXBUFFER_2048:
 783         default:
 784                 rctl |= IXGB_RCTL_BSIZE_2048;
 785                 break;
 786         case IXGB_RXBUFFER_4096:
 787                 rctl |= IXGB_RCTL_BSIZE_4096;
 788                 break;
 789         case IXGB_RXBUFFER_8192:
 790                 rctl |= IXGB_RCTL_BSIZE_8192;
 791                 break;
 792         case IXGB_RXBUFFER_16384:
 793                 rctl |= IXGB_RCTL_BSIZE_16384;
 794                 break;
 795         }
 796
 797         IXGB_WRITE_REG(&adapter->hw, RCTL, rctl);
 798 }
 799
 800 /**
 801  * ixgb_configure_rx - Configure 82597 Receive Unit after Reset.
 802  * @adapter: board private structure
 803  *
 804  * Configure the Rx unit of the MAC after a reset.
 805  **/
 806
 807 static void
 808 ixgb_configure_rx(struct ixgb_adapter *adapter)
 809 {
 810         uint64_t rdba = adapter->rx_ring.dma;
 811         uint32_t rdlen = adapter->rx_ring.count * sizeof(struct ixgb_rx_desc);
 812         struct ixgb_hw *hw = &adapter->hw;
 813         uint32_t rctl;
 814         uint32_t rxcsum;
 815         uint32_t rxdctl;
 816
 817         /* make sure receives are disabled while setting up the descriptors */
 818
 819         rctl = IXGB_READ_REG(hw, RCTL);
 820         IXGB_WRITE_REG(hw, RCTL, rctl & ~IXGB_RCTL_RXEN);
 821
 822         /* set the Receive Delay Timer Register */
 823
 824         IXGB_WRITE_REG(hw, RDTR, adapter->rx_int_delay);
 825
 826         /* Setup the Base and Length of the Rx Descriptor Ring */
 827
 828         IXGB_WRITE_REG(hw, RDBAL, (rdba & 0x00000000ffffffffULL));
 829         IXGB_WRITE_REG(hw, RDBAH, (rdba >> 32));
 830
 831         IXGB_WRITE_REG(hw, RDLEN, rdlen);
 832
 833         /* Setup the HW Rx Head and Tail Descriptor Pointers */
 834         IXGB_WRITE_REG(hw, RDH, 0);
 835         IXGB_WRITE_REG(hw, RDT, 0);
 836
 837         /* set up pre-fetching of receive buffers so we get some before we
 838          * run out (default hardware behavior is to run out before fetching
 839          * more).  This sets up to fetch if HTHRESH rx descriptors are avail
 840          * and the descriptors in hw cache are below PTHRESH.  This avoids
 841          * the hardware behavior of fetching <=512 descriptors in a single
 842          * burst that pre-empts all other activity, usually causing fifo
 843          * overflows. */
 844         /* use WTHRESH to burst write 16 descriptors or burst when RXT0 */
 845         rxdctl = RXDCTL_WTHRESH_DEFAULT << IXGB_RXDCTL_WTHRESH_SHIFT |
 846                  RXDCTL_HTHRESH_DEFAULT << IXGB_RXDCTL_HTHRESH_SHIFT |
 847                  RXDCTL_PTHRESH_DEFAULT << IXGB_RXDCTL_PTHRESH_SHIFT;
 848         IXGB_WRITE_REG(hw, RXDCTL, rxdctl);
 849
 850         /* Enable Receive Checksum Offload for TCP and UDP */
 851         if(adapter->rx_csum == TRUE) {
 852                 rxcsum = IXGB_READ_REG(hw, RXCSUM);
 853                 rxcsum |= IXGB_RXCSUM_TUOFL;
 854                 IXGB_WRITE_REG(hw, RXCSUM, rxcsum);
 855         }
 856
 857         /* Enable Receives */
 858
 859         IXGB_WRITE_REG(hw, RCTL, rctl);
 860 }
 861
 862 /**
 863  * ixgb_free_tx_resources - Free Tx Resources
 864  * @adapter: board private structure
 865  *
 866  * Free all transmit software resources
 867  **/
 868
 869 void
 870 ixgb_free_tx_resources(struct ixgb_adapter *adapter)
 871 {
 872         struct pci_dev *pdev = adapter->pdev;
 873
 874         ixgb_clean_tx_ring(adapter);
 875
 876         vfree(adapter->tx_ring.buffer_info);
 877         adapter->tx_ring.buffer_info = NULL;
 878
 879         pci_free_consistent(pdev, adapter->tx_ring.size,
 880                             adapter->tx_ring.desc, adapter->tx_ring.dma);
 881
 882         adapter->tx_ring.desc = NULL;
 883 }
 884
 885 static inline void
 886 ixgb_unmap_and_free_tx_resource(struct ixgb_adapter *adapter,
 887                                         struct ixgb_buffer *buffer_info)
 888 {
 889         struct pci_dev *pdev = adapter->pdev;
 890         if(buffer_info->dma) {
 891                 pci_unmap_page(pdev,
 892                            buffer_info->dma,
 893                            buffer_info->length,
 894                            PCI_DMA_TODEVICE);
 895                 buffer_info->dma = 0;
 896         }
 897         if(buffer_info->skb) {
 898                 dev_kfree_skb_any(buffer_info->skb);
 899                 buffer_info->skb = NULL;
 900         }
 901 }
 902
 903 /**
 904  * ixgb_clean_tx_ring - Free Tx Buffers
 905  * @adapter: board private structure
 906  **/
 907
 908 static void
 909 ixgb_clean_tx_ring(struct ixgb_adapter *adapter)
 910 {
 911         struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
 912         struct ixgb_buffer *buffer_info;
 913         unsigned long size;
 914         unsigned int i;
 915
 916         /* Free all the Tx ring sk_buffs */
 917
 918         for(i = 0; i < tx_ring->count; i++) {
 919                 buffer_info = &tx_ring->buffer_info[i];
 920                 ixgb_unmap_and_free_tx_resource(adapter, buffer_info);
 921         }
 922
 923         size = sizeof(struct ixgb_buffer) * tx_ring->count;
 924         memset(tx_ring->buffer_info, 0, size);
 925
 926         /* Zero out the descriptor ring */
 927
 928         memset(tx_ring->desc, 0, tx_ring->size);
 929
 930         tx_ring->next_to_use = 0;
 931         tx_ring->next_to_clean = 0;
 932
 933         IXGB_WRITE_REG(&adapter->hw, TDH, 0);
 934         IXGB_WRITE_REG(&adapter->hw, TDT, 0);
 935 }
 936
 937 /**
 938  * ixgb_free_rx_resources - Free Rx Resources
 939  * @adapter: board private structure
 940  *
 941  * Free all receive software resources
 942  **/
 943
 944 void
 945 ixgb_free_rx_resources(struct ixgb_adapter *adapter)
 946 {
 947         struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
 948         struct pci_dev *pdev = adapter->pdev;
 949
 950         ixgb_clean_rx_ring(adapter);
 951
 952         vfree(rx_ring->buffer_info);
 953         rx_ring->buffer_info = NULL;
 954
 955         pci_free_consistent(pdev, rx_ring->size, rx_ring->desc, rx_ring->dma);
 956
 957         rx_ring->desc = NULL;
 958 }
 959
 960 /**
 961  * ixgb_clean_rx_ring - Free Rx Buffers
 962  * @adapter: board private structure
 963  **/
 964
 965 static void
 966 ixgb_clean_rx_ring(struct ixgb_adapter *adapter)
 967 {
 968         struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
 969         struct ixgb_buffer *buffer_info;
 970         struct pci_dev *pdev = adapter->pdev;
 971         unsigned long size;
 972         unsigned int i;
 973
 974         /* Free all the Rx ring sk_buffs */
 975
 976         for(i = 0; i < rx_ring->count; i++) {
 977                 buffer_info = &rx_ring->buffer_info[i];
 978                 if(buffer_info->skb) {
 979
 980                         pci_unmap_single(pdev,
 981                                          buffer_info->dma,
 982                                          buffer_info->length,
 983                                          PCI_DMA_FROMDEVICE);
 984
 985                         dev_kfree_skb(buffer_info->skb);
 986
 987                         buffer_info->skb = NULL;
 988                 }
 989         }
 990
 991         size = sizeof(struct ixgb_buffer) * rx_ring->count;
 992         memset(rx_ring->buffer_info, 0, size);
 993
 994         /* Zero out the descriptor ring */
 995
 996         memset(rx_ring->desc, 0, rx_ring->size);
 997
 998         rx_ring->next_to_clean = 0;
 999         rx_ring->next_to_use = 0;
1000
1001         IXGB_WRITE_REG(&adapter->hw, RDH, 0);
1002         IXGB_WRITE_REG(&adapter->hw, RDT, 0);
1003 }
1004
1005 /**
1006  * ixgb_set_mac - Change the Ethernet Address of the NIC
1007  * @netdev: network interface device structure
1008  * @p: pointer to an address structure
1009  *
1010  * Returns 0 on success, negative on failure
1011  **/
1012
1013 static int
1014 ixgb_set_mac(struct net_device *netdev, void *p)
1015 {
1016         struct ixgb_adapter *adapter = netdev->priv;
1017         struct sockaddr *addr = p;
1018
1019         if(!is_valid_ether_addr(addr->sa_data))
1020                 return -EADDRNOTAVAIL;
1021
1022         memcpy(netdev->dev_addr, addr->sa_data, netdev->addr_len);
1023
1024         ixgb_rar_set(&adapter->hw, addr->sa_data, 0);
1025
1026         return 0;
1027 }
1028
1029 /**
1030  * ixgb_set_multi - Multicast and Promiscuous mode set
1031  * @netdev: network interface device structure
1032  *
1033  * The set_multi entry point is called whenever the multicast address
1034  * list or the network interface flags are updated.  This routine is
1035  * responsible for configuring the hardware for proper multicast,
1036  * promiscuous mode, and all-multi behavior.
1037  **/
1038
1039 static void
1040 ixgb_set_multi(struct net_device *netdev)
1041 {
1042         struct ixgb_adapter *adapter = netdev->priv;
1043         struct ixgb_hw *hw = &adapter->hw;
1044         struct dev_mc_list *mc_ptr;
1045         uint32_t rctl;
1046         int i;
1047
1048         /* Check for Promiscuous and All Multicast modes */
1049
1050         rctl = IXGB_READ_REG(hw, RCTL);
1051
1052         if(netdev->flags & IFF_PROMISC) {
1053                 rctl |= (IXGB_RCTL_UPE | IXGB_RCTL_MPE);
1054         } else if(netdev->flags & IFF_ALLMULTI) {
1055                 rctl |= IXGB_RCTL_MPE;
1056                 rctl &= ~IXGB_RCTL_UPE;
1057         } else {
1058                 rctl &= ~(IXGB_RCTL_UPE | IXGB_RCTL_MPE);
1059         }
1060
1061         if(netdev->mc_count > IXGB_MAX_NUM_MULTICAST_ADDRESSES) {
1062                 rctl |= IXGB_RCTL_MPE;
1063                 IXGB_WRITE_REG(hw, RCTL, rctl);
1064         } else {
1065                 uint8_t mta[netdev->mc_count * IXGB_ETH_LENGTH_OF_ADDRESS];
1066
1067                 IXGB_WRITE_REG(hw, RCTL, rctl);
1068
1069                 for(i = 0, mc_ptr = netdev->mc_list; mc_ptr;
1070                         i++, mc_ptr = mc_ptr->next)
1071                         memcpy(&mta[i * IXGB_ETH_LENGTH_OF_ADDRESS],
1072                                    mc_ptr->dmi_addr, IXGB_ETH_LENGTH_OF_ADDRESS);
1073
1074                 ixgb_mc_addr_list_update(hw, mta, netdev->mc_count, 0);
1075         }
1076 }
1077
1078 /**
1079  * ixgb_watchdog - Timer Call-back
1080  * @data: pointer to netdev cast into an unsigned long
1081  **/
1082
1083 static void
1084 ixgb_watchdog(unsigned long data)
1085 {
1086         struct ixgb_adapter *adapter = (struct ixgb_adapter *)data;
1087         struct net_device *netdev = adapter->netdev;
1088         struct ixgb_desc_ring *txdr = &adapter->tx_ring;
1089
1090         ixgb_check_for_link(&adapter->hw);
1091
1092         if (ixgb_check_for_bad_link(&adapter->hw)) {
1093                 /* force the reset path */
1094                 netif_stop_queue(netdev);
1095         }
1096
1097         if(adapter->hw.link_up) {
1098                 if(!netif_carrier_ok(netdev)) {
1099                         printk(KERN_INFO "ixgb: %s NIC Link is Up %d Mbps %s\n",
1100                                    netdev->name, 10000, "Full Duplex");
1101                         adapter->link_speed = 10000;
1102                         adapter->link_duplex = FULL_DUPLEX;
1103                         netif_carrier_on(netdev);
1104                         netif_wake_queue(netdev);
1105                 }
1106         } else {
1107                 if(netif_carrier_ok(netdev)) {
1108                         adapter->link_speed = 0;
1109                         adapter->link_duplex = 0;
1110                         printk(KERN_INFO
1111                                    "ixgb: %s NIC Link is Down\n",
1112                                    netdev->name);
1113                         netif_carrier_off(netdev);
1114                         netif_stop_queue(netdev);
1115
1116                 }
1117         }
1118
1119         ixgb_update_stats(adapter);
1120
1121         if(!netif_carrier_ok(netdev)) {
1122                 if(IXGB_DESC_UNUSED(txdr) + 1 < txdr->count) {
1123                         /* We've lost link, so the controller stops DMA,
1124                          * but we've got queued Tx work that's never going
1125                          * to get done, so reset controller to flush Tx.
1126                          * (Do the reset outside of interrupt context). */
1127                         schedule_work(&adapter->tx_timeout_task);
1128                 }
1129         }
1130
1131         /* Force detection of hung controller every watchdog period */
1132         adapter->detect_tx_hung = TRUE;
1133
1134         /* generate an interrupt to force clean up of any stragglers */
1135         IXGB_WRITE_REG(&adapter->hw, ICS, IXGB_INT_TXDW);
1136
1137         /* Reset the timer */
1138         mod_timer(&adapter->watchdog_timer, jiffies + 2 * HZ);
1139 }
1140
1141 #define IXGB_TX_FLAGS_CSUM              0x00000001
1142 #define IXGB_TX_FLAGS_VLAN              0x00000002
1143 #define IXGB_TX_FLAGS_TSO               0x00000004
1144
1145 static inline int
1146 ixgb_tso(struct ixgb_adapter *adapter, struct sk_buff *skb)
1147 {
1148 #ifdef NETIF_F_TSO
1149         struct ixgb_context_desc *context_desc;
1150         unsigned int i;
1151         uint8_t ipcss, ipcso, tucss, tucso, hdr_len;
1152         uint16_t ipcse, tucse, mss;
1153         int err;
1154
1155         if(likely(skb_shinfo(skb)->tso_size)) {
1156                 if (skb_header_cloned(skb)) {
1157                         err = pskb_expand_head(skb, 0, 0, GFP_ATOMIC);
1158                         if (err)
1159                                 return err;
1160                 }
1161
1162                 hdr_len = ((skb->h.raw - skb->data) + (skb->h.th->doff << 2));
1163                 mss = skb_shinfo(skb)->tso_size;
1164                 skb->nh.iph->tot_len = 0;
1165                 skb->nh.iph->check = 0;
1166                 skb->h.th->check = ~csum_tcpudp_magic(skb->nh.iph->saddr,
1167                                                       skb->nh.iph->daddr,
1168                                                       0, IPPROTO_TCP, 0);
1169                 ipcss = skb->nh.raw - skb->data;
1170                 ipcso = (void *)&(skb->nh.iph->check) - (void *)skb->data;
1171                 ipcse = skb->h.raw - skb->data - 1;
1172                 tucss = skb->h.raw - skb->data;
1173                 tucso = (void *)&(skb->h.th->check) - (void *)skb->data;
1174                 tucse = 0;
1175
1176                 i = adapter->tx_ring.next_to_use;
1177                 context_desc = IXGB_CONTEXT_DESC(adapter->tx_ring, i);
1178
1179                 context_desc->ipcss = ipcss;
1180                 context_desc->ipcso = ipcso;
1181                 context_desc->ipcse = cpu_to_le16(ipcse);
1182                 context_desc->tucss = tucss;
1183                 context_desc->tucso = tucso;
1184                 context_desc->tucse = cpu_to_le16(tucse);
1185                 context_desc->mss = cpu_to_le16(mss);
1186                 context_desc->hdr_len = hdr_len;
1187                 context_desc->status = 0;
1188                 context_desc->cmd_type_len = cpu_to_le32(
1189                                                   IXGB_CONTEXT_DESC_TYPE
1190                                                 | IXGB_CONTEXT_DESC_CMD_TSE
1191                                                 | IXGB_CONTEXT_DESC_CMD_IP
1192                                                 | IXGB_CONTEXT_DESC_CMD_TCP
1193                                                 | IXGB_CONTEXT_DESC_CMD_IDE
1194                                                 | (skb->len - (hdr_len)));
1195
1196
1197                 if(++i == adapter->tx_ring.count) i = 0;
1198                 adapter->tx_ring.next_to_use = i;
1199
1200                 return 1;
1201         }
1202 #endif
1203
1204         return 0;
1205 }
1206
1207 static inline boolean_t
1208 ixgb_tx_csum(struct ixgb_adapter *adapter, struct sk_buff *skb)
1209 {
1210         struct ixgb_context_desc *context_desc;
1211         unsigned int i;
1212         uint8_t css, cso;
1213
1214         if(likely(skb->ip_summed == CHECKSUM_HW)) {
1215                 css = skb->h.raw - skb->data;
1216                 cso = (skb->h.raw + skb->csum) - skb->data;
1217
1218                 i = adapter->tx_ring.next_to_use;
1219                 context_desc = IXGB_CONTEXT_DESC(adapter->tx_ring, i);
1220
1221                 context_desc->tucss = css;
1222                 context_desc->tucso = cso;
1223                 context_desc->tucse = 0;
1224                 /* zero out any previously existing data in one instruction */
1225                 *(uint32_t *)&(context_desc->ipcss) = 0;
1226                 context_desc->status = 0;
1227                 context_desc->hdr_len = 0;
1228                 context_desc->mss = 0;
1229                 context_desc->cmd_type_len =
1230                         cpu_to_le32(IXGB_CONTEXT_DESC_TYPE
1231                                     | IXGB_TX_DESC_CMD_IDE);
1232
1233                 if(++i == adapter->tx_ring.count) i = 0;
1234                 adapter->tx_ring.next_to_use = i;
1235
1236                 return TRUE;
1237         }
1238
1239         return FALSE;
1240 }
1241
1242 #define IXGB_MAX_TXD_PWR        14
1243 #define IXGB_MAX_DATA_PER_TXD   (1<<IXGB_MAX_TXD_PWR)
1244
1245 static inline int
1246 ixgb_tx_map(struct ixgb_adapter *adapter, struct sk_buff *skb,
1247             unsigned int first)
1248 {
1249         struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
1250         struct ixgb_buffer *buffer_info;
1251         int len = skb->len;
1252         unsigned int offset = 0, size, count = 0, i;
1253
1254         unsigned int nr_frags = skb_shinfo(skb)->nr_frags;
1255         unsigned int f;
1256         len -= skb->data_len;
1257
1258         i = tx_ring->next_to_use;
1259
1260         while(len) {
1261                 buffer_info = &tx_ring->buffer_info[i];
1262                 size = min(len, IXGB_MAX_JUMBO_FRAME_SIZE);
1263                 buffer_info->length = size;
1264                 buffer_info->dma =
1265                         pci_map_single(adapter->pdev,
1266                                 skb->data + offset,
1267                                 size,
1268                                 PCI_DMA_TODEVICE);
1269                 buffer_info->time_stamp = jiffies;
1270
1271                 len -= size;
1272                 offset += size;
1273                 count++;
1274                 if(++i == tx_ring->count) i = 0;
1275         }
1276
1277         for(f = 0; f < nr_frags; f++) {
1278                 struct skb_frag_struct *frag;
1279
1280                 frag = &skb_shinfo(skb)->frags[f];
1281                 len = frag->size;
1282                 offset = 0;
1283
1284                 while(len) {
1285                         buffer_info = &tx_ring->buffer_info[i];
1286                         size = min(len, IXGB_MAX_JUMBO_FRAME_SIZE);
1287                         buffer_info->length = size;
1288                         buffer_info->dma =
1289                                 pci_map_page(adapter->pdev,
1290                                         frag->page,
1291                                         frag->page_offset + offset,
1292                                         size,
1293                                         PCI_DMA_TODEVICE);
1294                         buffer_info->time_stamp = jiffies;
1295
1296                         len -= size;
1297                         offset += size;
1298                         count++;
1299                         if(++i == tx_ring->count) i = 0;
1300                 }
1301         }
1302         i = (i == 0) ? tx_ring->count - 1 : i - 1;
1303         tx_ring->buffer_info[i].skb = skb;
1304         tx_ring->buffer_info[first].next_to_watch = i;
1305
1306         return count;
1307 }
1308
1309 static inline void
1310 ixgb_tx_queue(struct ixgb_adapter *adapter, int count, int vlan_id,int tx_flags)
1311 {
1312         struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
1313         struct ixgb_tx_desc *tx_desc = NULL;
1314         struct ixgb_buffer *buffer_info;
1315         uint32_t cmd_type_len = adapter->tx_cmd_type;
1316         uint8_t status = 0;
1317         uint8_t popts = 0;
1318         unsigned int i;
1319
1320         if(tx_flags & IXGB_TX_FLAGS_TSO) {
1321                 cmd_type_len |= IXGB_TX_DESC_CMD_TSE;
1322                 popts |= (IXGB_TX_DESC_POPTS_IXSM | IXGB_TX_DESC_POPTS_TXSM);
1323         }
1324
1325         if(tx_flags & IXGB_TX_FLAGS_CSUM)
1326                 popts |= IXGB_TX_DESC_POPTS_TXSM;
1327
1328         if(tx_flags & IXGB_TX_FLAGS_VLAN) {
1329                 cmd_type_len |= IXGB_TX_DESC_CMD_VLE;
1330         }
1331
1332         i = tx_ring->next_to_use;
1333
1334         while(count--) {
1335                 buffer_info = &tx_ring->buffer_info[i];
1336                 tx_desc = IXGB_TX_DESC(*tx_ring, i);
1337                 tx_desc->buff_addr = cpu_to_le64(buffer_info->dma);
1338                 tx_desc->cmd_type_len =
1339                         cpu_to_le32(cmd_type_len | buffer_info->length);
1340                 tx_desc->status = status;
1341                 tx_desc->popts = popts;
1342                 tx_desc->vlan = cpu_to_le16(vlan_id);
1343
1344                 if(++i == tx_ring->count) i = 0;
1345         }
1346
1347         tx_desc->cmd_type_len |= cpu_to_le32(IXGB_TX_DESC_CMD_EOP
1348                                 | IXGB_TX_DESC_CMD_RS );
1349
1350         /* Force memory writes to complete before letting h/w
1351          * know there are new descriptors to fetch.  (Only
1352          * applicable for weak-ordered memory model archs,
1353          * such as IA-64). */
1354         wmb();
1355
1356         tx_ring->next_to_use = i;
1357         IXGB_WRITE_REG(&adapter->hw, TDT, i);
1358 }
1359
1360 /* Tx Descriptors needed, worst case */
1361 #define TXD_USE_COUNT(S) (((S) >> IXGB_MAX_TXD_PWR) + \
1362                          (((S) & (IXGB_MAX_DATA_PER_TXD - 1)) ? 1 : 0))
1363 #define DESC_NEEDED TXD_USE_COUNT(IXGB_MAX_DATA_PER_TXD) + \
1364         MAX_SKB_FRAGS * TXD_USE_COUNT(PAGE_SIZE) + 1
1365
1366 static int
1367 ixgb_xmit_frame(struct sk_buff *skb, struct net_device *netdev)
1368 {
1369         struct ixgb_adapter *adapter = netdev->priv;
1370         unsigned int first;
1371         unsigned int tx_flags = 0;
1372         unsigned long flags;
1373         int vlan_id = 0;
1374         int tso;
1375
1376         if(skb->len <= 0) {
1377                 dev_kfree_skb_any(skb);
1378                 return 0;
1379         }
1380
1381         spin_lock_irqsave(&adapter->tx_lock, flags);
1382         if(unlikely(IXGB_DESC_UNUSED(&adapter->tx_ring) < DESC_NEEDED)) {
1383                 netif_stop_queue(netdev);
1384                 spin_unlock_irqrestore(&adapter->tx_lock, flags);
1385                 return 1;
1386         }
1387         spin_unlock_irqrestore(&adapter->tx_lock, flags);
1388
1389         if(adapter->vlgrp && vlan_tx_tag_present(skb)) {
1390                 tx_flags |= IXGB_TX_FLAGS_VLAN;
1391                 vlan_id = vlan_tx_tag_get(skb);
1392         }
1393
1394         first = adapter->tx_ring.next_to_use;
1395
1396         tso = ixgb_tso(adapter, skb);
1397         if (tso < 0) {
1398                 dev_kfree_skb_any(skb);
1399                 return NETDEV_TX_OK;
1400         }
1401
1402         if (tso)
1403                 tx_flags |= IXGB_TX_FLAGS_TSO;
1404         else if(ixgb_tx_csum(adapter, skb))
1405                 tx_flags |= IXGB_TX_FLAGS_CSUM;
1406
1407         ixgb_tx_queue(adapter, ixgb_tx_map(adapter, skb, first), vlan_id,
1408                         tx_flags);
1409
1410         netdev->trans_start = jiffies;
1411
1412         return 0;
1413 }
1414
1415 /**
1416  * ixgb_tx_timeout - Respond to a Tx Hang
1417  * @netdev: network interface device structure
1418  **/
1419
1420 static void
1421 ixgb_tx_timeout(struct net_device *netdev)
1422 {
1423         struct ixgb_adapter *adapter = netdev->priv;
1424
1425         /* Do the reset outside of interrupt context */
1426         schedule_work(&adapter->tx_timeout_task);
1427 }
1428
1429 static void
1430 ixgb_tx_timeout_task(struct net_device *netdev)
1431 {
1432         struct ixgb_adapter *adapter = netdev->priv;
1433
1434         ixgb_down(adapter, TRUE);
1435         ixgb_up(adapter);
1436 }
1437
1438 /**
1439  * ixgb_get_stats - Get System Network Statistics
1440  * @netdev: network interface device structure
1441  *
1442  * Returns the address of the device statistics structure.
1443  * The statistics are actually updated from the timer callback.
1444  **/
1445
1446 static struct net_device_stats *
1447 ixgb_get_stats(struct net_device *netdev)
1448 {
1449         struct ixgb_adapter *adapter = netdev->priv;
1450
1451         return &adapter->net_stats;
1452 }
1453
1454 /**
1455  * ixgb_change_mtu - Change the Maximum Transfer Unit
1456  * @netdev: network interface device structure
1457  * @new_mtu: new value for maximum frame size
1458  *
1459  * Returns 0 on success, negative on failure
1460  **/
1461
1462 static int
1463 ixgb_change_mtu(struct net_device *netdev, int new_mtu)
1464 {
1465         struct ixgb_adapter *adapter = netdev->priv;
1466         int max_frame = new_mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;
1467         int old_max_frame = netdev->mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;
1468
1469
1470         if((max_frame < IXGB_MIN_ENET_FRAME_SIZE_WITHOUT_FCS + ENET_FCS_LENGTH)
1471            || (max_frame > IXGB_MAX_JUMBO_FRAME_SIZE + ENET_FCS_LENGTH)) {
1472                 IXGB_ERR("Invalid MTU setting\n");
1473                 return -EINVAL;
1474         }
1475
1476         if((max_frame <= IXGB_MAX_ENET_FRAME_SIZE_WITHOUT_FCS + ENET_FCS_LENGTH)
1477            || (max_frame <= IXGB_RXBUFFER_2048)) {
1478                 adapter->rx_buffer_len = IXGB_RXBUFFER_2048;
1479
1480         } else if(max_frame <= IXGB_RXBUFFER_4096) {
1481                 adapter->rx_buffer_len = IXGB_RXBUFFER_4096;
1482
1483         } else if(max_frame <= IXGB_RXBUFFER_8192) {
1484                 adapter->rx_buffer_len = IXGB_RXBUFFER_8192;
1485
1486         } else {
1487                 adapter->rx_buffer_len = IXGB_RXBUFFER_16384;
1488         }
1489
1490         netdev->mtu = new_mtu;
1491
1492         if(old_max_frame != max_frame && netif_running(netdev)) {
1493
1494                 ixgb_down(adapter, TRUE);
1495                 ixgb_up(adapter);
1496         }
1497
1498         return 0;
1499 }
1500
1501 /**
1502  * ixgb_update_stats - Update the board statistics counters.
1503  * @adapter: board private structure
1504  **/
1505
1506 void
1507 ixgb_update_stats(struct ixgb_adapter *adapter)
1508 {
1509         struct net_device *netdev = adapter->netdev;
1510
1511         if((netdev->flags & IFF_PROMISC) || (netdev->flags & IFF_ALLMULTI) ||
1512            (netdev->mc_count > IXGB_MAX_NUM_MULTICAST_ADDRESSES)) {
1513                 u64 multi = IXGB_READ_REG(&adapter->hw, MPRCL);
1514                 u32 bcast_l = IXGB_READ_REG(&adapter->hw, BPRCL);
1515                 u32 bcast_h = IXGB_READ_REG(&adapter->hw, BPRCH);
1516                 u64 bcast = ((u64)bcast_h << 32) | bcast_l;
1517
1518                 multi |= ((u64)IXGB_READ_REG(&adapter->hw, MPRCH) << 32);
1519                 /* fix up multicast stats by removing broadcasts */
1520                 multi -= bcast;
1521
1522                 adapter->stats.mprcl += (multi & 0xFFFFFFFF);
1523                 adapter->stats.mprch += (multi >> 32);
1524                 adapter->stats.bprcl += bcast_l;
1525                 adapter->stats.bprch += bcast_h;
1526         } else {
1527                 adapter->stats.mprcl += IXGB_READ_REG(&adapter->hw, MPRCL);
1528                 adapter->stats.mprch += IXGB_READ_REG(&adapter->hw, MPRCH);
1529                 adapter->stats.bprcl += IXGB_READ_REG(&adapter->hw, BPRCL);
1530                 adapter->stats.bprch += IXGB_READ_REG(&adapter->hw, BPRCH);
1531         }
1532         adapter->stats.tprl += IXGB_READ_REG(&adapter->hw, TPRL);
1533         adapter->stats.tprh += IXGB_READ_REG(&adapter->hw, TPRH);
1534         adapter->stats.gprcl += IXGB_READ_REG(&adapter->hw, GPRCL);
1535         adapter->stats.gprch += IXGB_READ_REG(&adapter->hw, GPRCH);
1536         adapter->stats.uprcl += IXGB_READ_REG(&adapter->hw, UPRCL);
1537         adapter->stats.uprch += IXGB_READ_REG(&adapter->hw, UPRCH);
1538         adapter->stats.vprcl += IXGB_READ_REG(&adapter->hw, VPRCL);
1539         adapter->stats.vprch += IXGB_READ_REG(&adapter->hw, VPRCH);
1540         adapter->stats.jprcl += IXGB_READ_REG(&adapter->hw, JPRCL);
1541         adapter->stats.jprch += IXGB_READ_REG(&adapter->hw, JPRCH);
1542         adapter->stats.gorcl += IXGB_READ_REG(&adapter->hw, GORCL);
1543         adapter->stats.gorch += IXGB_READ_REG(&adapter->hw, GORCH);
1544         adapter->stats.torl += IXGB_READ_REG(&adapter->hw, TORL);
1545         adapter->stats.torh += IXGB_READ_REG(&adapter->hw, TORH);
1546         adapter->stats.rnbc += IXGB_READ_REG(&adapter->hw, RNBC);
1547         adapter->stats.ruc += IXGB_READ_REG(&adapter->hw, RUC);
1548         adapter->stats.roc += IXGB_READ_REG(&adapter->hw, ROC);
1549         adapter->stats.rlec += IXGB_READ_REG(&adapter->hw, RLEC);
1550         adapter->stats.crcerrs += IXGB_READ_REG(&adapter->hw, CRCERRS);
1551         adapter->stats.icbc += IXGB_READ_REG(&adapter->hw, ICBC);
1552         adapter->stats.ecbc += IXGB_READ_REG(&adapter->hw, ECBC);
1553         adapter->stats.mpc += IXGB_READ_REG(&adapter->hw, MPC);
1554         adapter->stats.tptl += IXGB_READ_REG(&adapter->hw, TPTL);
1555         adapter->stats.tpth += IXGB_READ_REG(&adapter->hw, TPTH);
1556         adapter->stats.gptcl += IXGB_READ_REG(&adapter->hw, GPTCL);
1557         adapter->stats.gptch += IXGB_READ_REG(&adapter->hw, GPTCH);
1558         adapter->stats.bptcl += IXGB_READ_REG(&adapter->hw, BPTCL);
1559         adapter->stats.bptch += IXGB_READ_REG(&adapter->hw, BPTCH);
1560         adapter->stats.mptcl += IXGB_READ_REG(&adapter->hw, MPTCL);
1561         adapter->stats.mptch += IXGB_READ_REG(&adapter->hw, MPTCH);
1562         adapter->stats.uptcl += IXGB_READ_REG(&adapter->hw, UPTCL);
1563         adapter->stats.uptch += IXGB_READ_REG(&adapter->hw, UPTCH);
1564         adapter->stats.vptcl += IXGB_READ_REG(&adapter->hw, VPTCL);
1565         adapter->stats.vptch += IXGB_READ_REG(&adapter->hw, VPTCH);
1566         adapter->stats.jptcl += IXGB_READ_REG(&adapter->hw, JPTCL);
1567         adapter->stats.jptch += IXGB_READ_REG(&adapter->hw, JPTCH);
1568         adapter->stats.gotcl += IXGB_READ_REG(&adapter->hw, GOTCL);
1569         adapter->stats.gotch += IXGB_READ_REG(&adapter->hw, GOTCH);
1570         adapter->stats.totl += IXGB_READ_REG(&adapter->hw, TOTL);
1571         adapter->stats.toth += IXGB_READ_REG(&adapter->hw, TOTH);
1572         adapter->stats.dc += IXGB_READ_REG(&adapter->hw, DC);
1573         adapter->stats.plt64c += IXGB_READ_REG(&adapter->hw, PLT64C);
1574         adapter->stats.tsctc += IXGB_READ_REG(&adapter->hw, TSCTC);
1575         adapter->stats.tsctfc += IXGB_READ_REG(&adapter->hw, TSCTFC);
1576         adapter->stats.ibic += IXGB_READ_REG(&adapter->hw, IBIC);
1577         adapter->stats.rfc += IXGB_READ_REG(&adapter->hw, RFC);
1578         adapter->stats.lfc += IXGB_READ_REG(&adapter->hw, LFC);
1579         adapter->stats.pfrc += IXGB_READ_REG(&adapter->hw, PFRC);
1580         adapter->stats.pftc += IXGB_READ_REG(&adapter->hw, PFTC);
1581         adapter->stats.mcfrc += IXGB_READ_REG(&adapter->hw, MCFRC);
1582         adapter->stats.mcftc += IXGB_READ_REG(&adapter->hw, MCFTC);
1583         adapter->stats.xonrxc += IXGB_READ_REG(&adapter->hw, XONRXC);
1584         adapter->stats.xontxc += IXGB_READ_REG(&adapter->hw, XONTXC);
1585         adapter->stats.xoffrxc += IXGB_READ_REG(&adapter->hw, XOFFRXC);
1586         adapter->stats.xofftxc += IXGB_READ_REG(&adapter->hw, XOFFTXC);
1587         adapter->stats.rjc += IXGB_READ_REG(&adapter->hw, RJC);
1588
1589         /* Fill out the OS statistics structure */
1590
1591         adapter->net_stats.rx_packets = adapter->stats.gprcl;
1592         adapter->net_stats.tx_packets = adapter->stats.gptcl;
1593         adapter->net_stats.rx_bytes = adapter->stats.gorcl;
1594         adapter->net_stats.tx_bytes = adapter->stats.gotcl;
1595         adapter->net_stats.multicast = adapter->stats.mprcl;
1596         adapter->net_stats.collisions = 0;
1597
1598         /* ignore RLEC as it reports errors for padded (<64bytes) frames
1599          * with a length in the type/len field */
1600         adapter->net_stats.rx_errors =
1601             /* adapter->stats.rnbc + */ adapter->stats.crcerrs +
1602             adapter->stats.ruc +
1603             adapter->stats.roc /*+ adapter->stats.rlec */  +
1604             adapter->stats.icbc +
1605             adapter->stats.ecbc + adapter->stats.mpc;
1606
1607         adapter->net_stats.rx_dropped = adapter->stats.mpc;
1608
1609         /* see above
1610          * adapter->net_stats.rx_length_errors = adapter->stats.rlec;
1611          */
1612
1613         adapter->net_stats.rx_crc_errors = adapter->stats.crcerrs;
1614         adapter->net_stats.rx_fifo_errors = adapter->stats.mpc;
1615         adapter->net_stats.rx_missed_errors = adapter->stats.mpc;
1616         adapter->net_stats.rx_over_errors = adapter->stats.mpc;
1617
1618         adapter->net_stats.tx_errors = 0;
1619         adapter->net_stats.rx_frame_errors = 0;
1620         adapter->net_stats.tx_aborted_errors = 0;
1621         adapter->net_stats.tx_carrier_errors = 0;
1622         adapter->net_stats.tx_fifo_errors = 0;
1623         adapter->net_stats.tx_heartbeat_errors = 0;
1624         adapter->net_stats.tx_window_errors = 0;
1625 }
1626
1627 #define IXGB_MAX_INTR 10
1628 /**
1629  * ixgb_intr - Interrupt Handler
1630  * @irq: interrupt number
1631  * @data: pointer to a network interface device structure
1632  * @pt_regs: CPU registers structure
1633  **/
1634
1635 static irqreturn_t
1636 ixgb_intr(int irq, void *data, struct pt_regs *regs)
1637 {
1638         struct net_device *netdev = data;
1639         struct ixgb_adapter *adapter = netdev->priv;
1640         struct ixgb_hw *hw = &adapter->hw;
1641         uint32_t icr = IXGB_READ_REG(hw, ICR);
1642 #ifndef CONFIG_IXGB_NAPI
1643         unsigned int i;
1644 #endif
1645
1646         if(unlikely(!icr))
1647                 return IRQ_NONE;  /* Not our interrupt */
1648
1649         if(unlikely(icr & (IXGB_INT_RXSEQ | IXGB_INT_LSC))) {
1650                 mod_timer(&adapter->watchdog_timer, jiffies);
1651         }
1652
1653 #ifdef CONFIG_IXGB_NAPI
1654         if(netif_rx_schedule_prep(netdev)) {
1655
1656                 /* Disable interrupts and register for poll. The flush
1657                   of the posted write is intentionally left out.
1658                 */
1659
1660                 atomic_inc(&adapter->irq_sem);
1661                 IXGB_WRITE_REG(&adapter->hw, IMC, ~0);
1662                 __netif_rx_schedule(netdev);
1663         }
1664 #else
1665         /* yes, that is actually a & and it is meant to make sure that
1666          * every pass through this for loop checks both receive and
1667          * transmit queues for completed descriptors, intended to
1668          * avoid starvation issues and assist tx/rx fairness. */
1669         for(i = 0; i < IXGB_MAX_INTR; i++)
1670                 if(!ixgb_clean_rx_irq(adapter) &
1671                    !ixgb_clean_tx_irq(adapter))
1672                         break;
1673 #endif
1674         return IRQ_HANDLED;
1675 }
1676
1677 #ifdef CONFIG_IXGB_NAPI
1678 /**
1679  * ixgb_clean - NAPI Rx polling callback
1680  * @adapter: board private structure
1681  **/
1682
1683 static int
1684 ixgb_clean(struct net_device *netdev, int *budget)
1685 {
1686         struct ixgb_adapter *adapter = netdev->priv;
1687         int work_to_do = min(*budget, netdev->quota);
1688         int tx_cleaned;
1689         int work_done = 0;
1690
1691         tx_cleaned = ixgb_clean_tx_irq(adapter);
1692         ixgb_clean_rx_irq(adapter, &work_done, work_to_do);
1693
1694         *budget -= work_done;
1695         netdev->quota -= work_done;
1696
1697         /* if no Tx and not enough Rx work done, exit the polling mode */
1698         if((!tx_cleaned && (work_done == 0)) || !netif_running(netdev)) {
1699                 netif_rx_complete(netdev);
1700                 ixgb_irq_enable(adapter);
1701                 return 0;
1702         }
1703
1704         return 1;
1705 }
1706 #endif
1707
1708 /**
1709  * ixgb_clean_tx_irq - Reclaim resources after transmit completes
1710  * @adapter: board private structure
1711  **/
1712
1713 static boolean_t
1714 ixgb_clean_tx_irq(struct ixgb_adapter *adapter)
1715 {
1716         struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
1717         struct net_device *netdev = adapter->netdev;
1718         struct ixgb_tx_desc *tx_desc, *eop_desc;
1719         struct ixgb_buffer *buffer_info;
1720         unsigned int i, eop;
1721         boolean_t cleaned = FALSE;
1722
1723         i = tx_ring->next_to_clean;
1724         eop = tx_ring->buffer_info[i].next_to_watch;
1725         eop_desc = IXGB_TX_DESC(*tx_ring, eop);
1726
1727         while(eop_desc->status & IXGB_TX_DESC_STATUS_DD) {
1728
1729                 for(cleaned = FALSE; !cleaned; ) {
1730                         tx_desc = IXGB_TX_DESC(*tx_ring, i);
1731                         buffer_info = &tx_ring->buffer_info[i];
1732
1733                         if (tx_desc->popts
1734                             & (IXGB_TX_DESC_POPTS_TXSM |
1735                                IXGB_TX_DESC_POPTS_IXSM))
1736                                 adapter->hw_csum_tx_good++;
1737
1738                         ixgb_unmap_and_free_tx_resource(adapter, buffer_info);
1739
1740                         *(uint32_t *)&(tx_desc->status) = 0;
1741
1742                         cleaned = (i == eop);
1743                         if(++i == tx_ring->count) i = 0;
1744                 }
1745
1746                 eop = tx_ring->buffer_info[i].next_to_watch;
1747                 eop_desc = IXGB_TX_DESC(*tx_ring, eop);
1748         }
1749
1750         tx_ring->next_to_clean = i;
1751
1752         spin_lock(&adapter->tx_lock);
1753         if(cleaned && netif_queue_stopped(netdev) && netif_carrier_ok(netdev) &&
1754            (IXGB_DESC_UNUSED(tx_ring) > IXGB_TX_QUEUE_WAKE)) {
1755
1756                 netif_wake_queue(netdev);
1757         }
1758         spin_unlock(&adapter->tx_lock);
1759
1760         if(adapter->detect_tx_hung) {
1761                 /* detect a transmit hang in hardware, this serializes the
1762                  * check with the clearing of time_stamp and movement of i */
1763                 adapter->detect_tx_hung = FALSE;
1764                 if(tx_ring->buffer_info[i].dma &&
1765                    time_after(jiffies, tx_ring->buffer_info[i].time_stamp + HZ)
1766                    && !(IXGB_READ_REG(&adapter->hw, STATUS) &
1767                         IXGB_STATUS_TXOFF))
1768                         netif_stop_queue(netdev);
1769         }
1770
1771         return cleaned;
1772 }
1773
1774 /**
1775  * ixgb_rx_checksum - Receive Checksum Offload for 82597.
1776  * @adapter: board private structure
1777  * @rx_desc: receive descriptor
1778  * @sk_buff: socket buffer with received data
1779  **/
1780
1781 static inline void
1782 ixgb_rx_checksum(struct ixgb_adapter *adapter,
1783                  struct ixgb_rx_desc *rx_desc,
1784                  struct sk_buff *skb)
1785 {
1786         /* Ignore Checksum bit is set OR
1787          * TCP Checksum has not been calculated
1788          */
1789         if((rx_desc->status & IXGB_RX_DESC_STATUS_IXSM) ||
1790            (!(rx_desc->status & IXGB_RX_DESC_STATUS_TCPCS))) {
1791                 skb->ip_summed = CHECKSUM_NONE;
1792                 return;
1793         }
1794
1795         /* At this point we know the hardware did the TCP checksum */
1796         /* now look at the TCP checksum error bit */
1797         if(rx_desc->errors & IXGB_RX_DESC_ERRORS_TCPE) {
1798                 /* let the stack verify checksum errors */
1799                 skb->ip_summed = CHECKSUM_NONE;
1800                 adapter->hw_csum_rx_error++;
1801         } else {
1802                 /* TCP checksum is good */
1803                 skb->ip_summed = CHECKSUM_UNNECESSARY;
1804                 adapter->hw_csum_rx_good++;
1805         }
1806 }
1807
1808 /**
1809  * ixgb_clean_rx_irq - Send received data up the network stack,
1810  * @adapter: board private structure
1811  **/
1812
1813 static boolean_t
1814 #ifdef CONFIG_IXGB_NAPI
1815 ixgb_clean_rx_irq(struct ixgb_adapter *adapter, int *work_done, int work_to_do)
1816 #else
1817 ixgb_clean_rx_irq(struct ixgb_adapter *adapter)
1818 #endif
1819 {
1820         struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
1821         struct net_device *netdev = adapter->netdev;
1822         struct pci_dev *pdev = adapter->pdev;
1823         struct ixgb_rx_desc *rx_desc, *next_rxd;
1824         struct ixgb_buffer *buffer_info, *next_buffer, *next2_buffer;
1825         struct sk_buff *skb, *next_skb;
1826         uint32_t length;
1827         unsigned int i, j;
1828         boolean_t cleaned = FALSE;
1829
1830         i = rx_ring->next_to_clean;
1831         rx_desc = IXGB_RX_DESC(*rx_ring, i);
1832         buffer_info = &rx_ring->buffer_info[i];
1833
1834         while(rx_desc->status & IXGB_RX_DESC_STATUS_DD) {
1835
1836 #ifdef CONFIG_IXGB_NAPI
1837                 if(*work_done >= work_to_do)
1838                         break;
1839
1840                 (*work_done)++;
1841 #endif
1842                 skb = buffer_info->skb;
1843                 prefetch(skb->data);
1844
1845                 if(++i == rx_ring->count) i = 0;
1846                 next_rxd = IXGB_RX_DESC(*rx_ring, i);
1847                 prefetch(next_rxd);
1848
1849                 if((j = i + 1) == rx_ring->count) j = 0;
1850                 next2_buffer = &rx_ring->buffer_info[j];
1851                 prefetch(next2_buffer);
1852
1853                 next_buffer = &rx_ring->buffer_info[i];
1854                 next_skb = next_buffer->skb;
1855                 prefetch(next_skb);
1856
1857
1858                 cleaned = TRUE;
1859
1860                 pci_unmap_single(pdev,
1861                                  buffer_info->dma,
1862                                  buffer_info->length,
1863                                  PCI_DMA_FROMDEVICE);
1864
1865                 length = le16_to_cpu(rx_desc->length);
1866
1867                 if(unlikely(!(rx_desc->status & IXGB_RX_DESC_STATUS_EOP))) {
1868
1869                         /* All receives must fit into a single buffer */
1870
1871                         IXGB_DBG("Receive packet consumed multiple buffers "
1872                                          "length<%x>\n", length);
1873
1874                         dev_kfree_skb_irq(skb);
1875                         rx_desc->status = 0;
1876                         buffer_info->skb = NULL;
1877
1878                         rx_desc = next_rxd;
1879                         buffer_info = next_buffer;
1880                         continue;
1881                 }
1882
1883                 if (unlikely(rx_desc->errors
1884                              & (IXGB_RX_DESC_ERRORS_CE | IXGB_RX_DESC_ERRORS_SE
1885                                 | IXGB_RX_DESC_ERRORS_P |
1886                                 IXGB_RX_DESC_ERRORS_RXE))) {
1887
1888                         dev_kfree_skb_irq(skb);
1889                         rx_desc->status = 0;
1890                         buffer_info->skb = NULL;
1891
1892                         rx_desc = next_rxd;
1893                         buffer_info = next_buffer;
1894                         continue;
1895                 }
1896
1897                 /* Good Receive */
1898                 skb_put(skb, length);
1899
1900                 /* Receive Checksum Offload */
1901                 ixgb_rx_checksum(adapter, rx_desc, skb);
1902
1903                 skb->protocol = eth_type_trans(skb, netdev);
1904 #ifdef CONFIG_IXGB_NAPI
1905                 if(adapter->vlgrp && (rx_desc->status & IXGB_RX_DESC_STATUS_VP)) {
1906                         vlan_hwaccel_receive_skb(skb, adapter->vlgrp,
1907                                 le16_to_cpu(rx_desc->special) &
1908                                         IXGB_RX_DESC_SPECIAL_VLAN_MASK);
1909                 } else {
1910                         netif_receive_skb(skb);
1911                 }
1912 #else /* CONFIG_IXGB_NAPI */
1913                 if(adapter->vlgrp && (rx_desc->status & IXGB_RX_DESC_STATUS_VP)) {
1914                         vlan_hwaccel_rx(skb, adapter->vlgrp,
1915                                 le16_to_cpu(rx_desc->special) &
1916                                         IXGB_RX_DESC_SPECIAL_VLAN_MASK);
1917                 } else {
1918                         netif_rx(skb);
1919                 }
1920 #endif /* CONFIG_IXGB_NAPI */
1921                 netdev->last_rx = jiffies;
1922
1923                 rx_desc->status = 0;
1924                 buffer_info->skb = NULL;
1925
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         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 */