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   1 /*******************************************************************************
   2
   3
   4   Copyright(c) 1999 - 2005 Intel Corporation. All rights reserved.
   5
   6   This program is free software; you can redistribute it and/or modify it
   7   under the terms of the GNU General Public License as published by the Free
   8   Software Foundation; either version 2 of the License, or (at your option)
   9   any later version.
  10
  11   This program is distributed in the hope that it will be useful, but WITHOUT
  12   ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13   FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  14   more details.
  15
  16   You should have received a copy of the GNU General Public License along with
  17   this program; if not, write to the Free Software Foundation, Inc., 59
  18   Temple Place - Suite 330, Boston, MA  02111-1307, USA.
  19
  20   The full GNU General Public License is included in this distribution in the
  21   file called LICENSE.
  22
  23   Contact Information:
  24   Linux NICS <linux.nics@intel.com>
  25   Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
  26
  27 *******************************************************************************/
  28
  29 #include "ixgb.h"
  30
  31 /* Change Log
  32  * 1.0.88 01/05/05
  33  * - include fix to the condition that determines when to quit NAPI - Robert Olsson
  34  * - use netif_poll_{disable/enable} to synchronize between NAPI and i/f up/down
  35  * 1.0.84 10/26/04
  36  * - reset buffer_info->dma in Tx resource cleanup logic
  37  * 1.0.83 10/12/04
  38  * - sparse cleanup - shemminger@osdl.org
  39  * - fix tx resource cleanup logic
  40  */
  41
  42 char ixgb_driver_name[] = "ixgb";
  43 char ixgb_driver_string[] = "Intel(R) PRO/10GbE Network Driver";
  44
  45 #ifndef CONFIG_IXGB_NAPI
  46 #define DRIVERNAPI
  47 #else
  48 #define DRIVERNAPI "-NAPI"
  49 #endif
  50
  51 #define DRV_VERSION "1.0.95-k2"DRIVERNAPI
  52 char ixgb_driver_version[] = DRV_VERSION;
  53 char ixgb_copyright[] = "Copyright (c) 1999-2005 Intel Corporation.";
  54
  55 /* ixgb_pci_tbl - PCI Device ID Table
  56  *
  57  * Wildcard entries (PCI_ANY_ID) should come last
  58  * Last entry must be all 0s
  59  *
  60  * { Vendor ID, Device ID, SubVendor ID, SubDevice ID,
  61  *   Class, Class Mask, private data (not used) }
  62  */
  63 static struct pci_device_id ixgb_pci_tbl[] = {
  64         {INTEL_VENDOR_ID, IXGB_DEVICE_ID_82597EX,
  65          PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
  66         {INTEL_VENDOR_ID, IXGB_DEVICE_ID_82597EX_SR,
  67          PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
  68         {INTEL_VENDOR_ID, IXGB_DEVICE_ID_82597EX_LR,
  69          PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
  70
  71         /* required last entry */
  72         {0,}
  73 };
  74
  75 MODULE_DEVICE_TABLE(pci, ixgb_pci_tbl);
  76
  77 /* Local Function Prototypes */
  78
  79 int ixgb_up(struct ixgb_adapter *adapter);
  80 void ixgb_down(struct ixgb_adapter *adapter, boolean_t kill_watchdog);
  81 void ixgb_reset(struct ixgb_adapter *adapter);
  82 int ixgb_setup_tx_resources(struct ixgb_adapter *adapter);
  83 int ixgb_setup_rx_resources(struct ixgb_adapter *adapter);
  84 void ixgb_free_tx_resources(struct ixgb_adapter *adapter);
  85 void ixgb_free_rx_resources(struct ixgb_adapter *adapter);
  86 void ixgb_update_stats(struct ixgb_adapter *adapter);
  87
  88 static int ixgb_init_module(void);
  89 static void ixgb_exit_module(void);
  90 static int ixgb_probe(struct pci_dev *pdev, const struct pci_device_id *ent);
  91 static void __devexit ixgb_remove(struct pci_dev *pdev);
  92 static int ixgb_sw_init(struct ixgb_adapter *adapter);
  93 static int ixgb_open(struct net_device *netdev);
  94 static int ixgb_close(struct net_device *netdev);
  95 static void ixgb_configure_tx(struct ixgb_adapter *adapter);
  96 static void ixgb_configure_rx(struct ixgb_adapter *adapter);
  97 static void ixgb_setup_rctl(struct ixgb_adapter *adapter);
  98 static void ixgb_clean_tx_ring(struct ixgb_adapter *adapter);
  99 static void ixgb_clean_rx_ring(struct ixgb_adapter *adapter);
 100 static void ixgb_set_multi(struct net_device *netdev);
 101 static void ixgb_watchdog(unsigned long data);
 102 static int ixgb_xmit_frame(struct sk_buff *skb, struct net_device *netdev);
 103 static struct net_device_stats *ixgb_get_stats(struct net_device *netdev);
 104 static int ixgb_change_mtu(struct net_device *netdev, int new_mtu);
 105 static int ixgb_set_mac(struct net_device *netdev, void *p);
 106 static irqreturn_t ixgb_intr(int irq, void *data, struct pt_regs *regs);
 107 static boolean_t ixgb_clean_tx_irq(struct ixgb_adapter *adapter);
 108
 109 #ifdef CONFIG_IXGB_NAPI
 110 static int ixgb_clean(struct net_device *netdev, int *budget);
 111 static boolean_t ixgb_clean_rx_irq(struct ixgb_adapter *adapter,
 112                                    int *work_done, int work_to_do);
 113 #else
 114 static boolean_t ixgb_clean_rx_irq(struct ixgb_adapter *adapter);
 115 #endif
 116 static void ixgb_alloc_rx_buffers(struct ixgb_adapter *adapter);
 117 void ixgb_set_ethtool_ops(struct net_device *netdev);
 118 static void ixgb_tx_timeout(struct net_device *dev);
 119 static void ixgb_tx_timeout_task(struct net_device *dev);
 120 static void ixgb_vlan_rx_register(struct net_device *netdev,
 121                                   struct vlan_group *grp);
 122 static void ixgb_vlan_rx_add_vid(struct net_device *netdev, uint16_t vid);
 123 static void ixgb_vlan_rx_kill_vid(struct net_device *netdev, uint16_t vid);
 124 static void ixgb_restore_vlan(struct ixgb_adapter *adapter);
 125
 126 #ifdef CONFIG_NET_POLL_CONTROLLER
 127 /* for netdump / net console */
 128 static void ixgb_netpoll(struct net_device *dev);
 129 #endif
 130
 131 /* Exported from other modules */
 132
 133 extern void ixgb_check_options(struct ixgb_adapter *adapter);
 134
 135 static struct pci_driver ixgb_driver = {
 136         .name     = ixgb_driver_name,
 137         .id_table = ixgb_pci_tbl,
 138         .probe    = ixgb_probe,
 139         .remove   = __devexit_p(ixgb_remove),
 140 };
 141
 142 MODULE_AUTHOR("Intel Corporation, <linux.nics@intel.com>");
 143 MODULE_DESCRIPTION("Intel(R) PRO/10GbE Network Driver");
 144 MODULE_LICENSE("GPL");
 145 MODULE_VERSION(DRV_VERSION);
 146
 147 /* some defines for controlling descriptor fetches in h/w */
 148 #define RXDCTL_WTHRESH_DEFAULT 16       /* chip writes back at this many or RXT0 */
 149 #define RXDCTL_PTHRESH_DEFAULT 0                /* chip considers prefech below
 150                                                  * this */
 151 #define RXDCTL_HTHRESH_DEFAULT 0                /* chip will only prefetch if tail
 152                                                  * is pushed this many descriptors
 153                                                  * from head */
 154
 155 /**
 156  * ixgb_init_module - Driver Registration Routine
 157  *
 158  * ixgb_init_module is the first routine called when the driver is
 159  * loaded. All it does is register with the PCI subsystem.
 160  **/
 161
 162 static int __init
 163 ixgb_init_module(void)
 164 {
 165         printk(KERN_INFO "%s - version %s\n",
 166                ixgb_driver_string, ixgb_driver_version);
 167
 168         printk(KERN_INFO "%s\n", ixgb_copyright);
 169
 170         return pci_module_init(&ixgb_driver);
 171 }
 172
 173 module_init(ixgb_init_module);
 174
 175 /**
 176  * ixgb_exit_module - Driver Exit Cleanup Routine
 177  *
 178  * ixgb_exit_module is called just before the driver is removed
 179  * from memory.
 180  **/
 181
 182 static void __exit
 183 ixgb_exit_module(void)
 184 {
 185         pci_unregister_driver(&ixgb_driver);
 186 }
 187
 188 module_exit(ixgb_exit_module);
 189
 190 /**
 191  * ixgb_irq_disable - Mask off interrupt generation on the NIC
 192  * @adapter: board private structure
 193  **/
 194
 195 static inline void
 196 ixgb_irq_disable(struct ixgb_adapter *adapter)
 197 {
 198         atomic_inc(&adapter->irq_sem);
 199         IXGB_WRITE_REG(&adapter->hw, IMC, ~0);
 200         IXGB_WRITE_FLUSH(&adapter->hw);
 201         synchronize_irq(adapter->pdev->irq);
 202 }
 203
 204 /**
 205  * ixgb_irq_enable - Enable default interrupt generation settings
 206  * @adapter: board private structure
 207  **/
 208
 209 static inline void
 210 ixgb_irq_enable(struct ixgb_adapter *adapter)
 211 {
 212         if(atomic_dec_and_test(&adapter->irq_sem)) {
 213                 IXGB_WRITE_REG(&adapter->hw, IMS,
 214                                IXGB_INT_RXT0 | IXGB_INT_RXDMT0 | IXGB_INT_TXDW |
 215                                IXGB_INT_LSC);
 216                 IXGB_WRITE_FLUSH(&adapter->hw);
 217         }
 218 }
 219
 220 int
 221 ixgb_up(struct ixgb_adapter *adapter)
 222 {
 223         struct net_device *netdev = adapter->netdev;
 224         int err;
 225         int max_frame = netdev->mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;
 226         struct ixgb_hw *hw = &adapter->hw;
 227
 228         /* hardware has been reset, we need to reload some things */
 229
 230         ixgb_set_multi(netdev);
 231
 232         ixgb_restore_vlan(adapter);
 233
 234         ixgb_configure_tx(adapter);
 235         ixgb_setup_rctl(adapter);
 236         ixgb_configure_rx(adapter);
 237         ixgb_alloc_rx_buffers(adapter);
 238
 239 #ifdef CONFIG_PCI_MSI
 240         {
 241         boolean_t pcix = (IXGB_READ_REG(&adapter->hw, STATUS) &
 242                                                   IXGB_STATUS_PCIX_MODE) ? TRUE : FALSE;
 243         adapter->have_msi = TRUE;
 244
 245         if (!pcix)
 246            adapter->have_msi = FALSE;
 247         else if((err = pci_enable_msi(adapter->pdev))) {
 248                 printk (KERN_ERR
 249                  "Unable to allocate MSI interrupt Error: %d\n", err);
 250                 adapter->have_msi = FALSE;
 251                 /* proceed to try to request regular interrupt */
 252         }
 253         }
 254
 255 #endif
 256         if((err = request_irq(adapter->pdev->irq, &ixgb_intr,
 257                                   SA_SHIRQ | SA_SAMPLE_RANDOM,
 258                                   netdev->name, netdev)))
 259                 return err;
 260
 261         /* disable interrupts and get the hardware into a known state */
 262         IXGB_WRITE_REG(&adapter->hw, IMC, 0xffffffff);
 263
 264         if((hw->max_frame_size != max_frame) ||
 265                 (hw->max_frame_size !=
 266                 (IXGB_READ_REG(hw, MFS) >> IXGB_MFS_SHIFT))) {
 267
 268                 hw->max_frame_size = max_frame;
 269
 270                 IXGB_WRITE_REG(hw, MFS, hw->max_frame_size << IXGB_MFS_SHIFT);
 271
 272                 if(hw->max_frame_size >
 273                    IXGB_MAX_ENET_FRAME_SIZE_WITHOUT_FCS + ENET_FCS_LENGTH) {
 274                         uint32_t ctrl0 = IXGB_READ_REG(hw, CTRL0);
 275
 276                         if(!(ctrl0 & IXGB_CTRL0_JFE)) {
 277                                 ctrl0 |= IXGB_CTRL0_JFE;
 278                                 IXGB_WRITE_REG(hw, CTRL0, ctrl0);
 279                         }
 280                 }
 281         }
 282
 283         mod_timer(&adapter->watchdog_timer, jiffies);
 284         ixgb_irq_enable(adapter);
 285
 286 #ifdef CONFIG_IXGB_NAPI
 287         netif_poll_enable(netdev);
 288 #endif
 289         return 0;
 290 }
 291
 292 void
 293 ixgb_down(struct ixgb_adapter *adapter, boolean_t kill_watchdog)
 294 {
 295         struct net_device *netdev = adapter->netdev;
 296
 297         ixgb_irq_disable(adapter);
 298         free_irq(adapter->pdev->irq, netdev);
 299 #ifdef CONFIG_PCI_MSI
 300         if(adapter->have_msi == TRUE)
 301                 pci_disable_msi(adapter->pdev);
 302
 303 #endif
 304         if(kill_watchdog)
 305                 del_timer_sync(&adapter->watchdog_timer);
 306 #ifdef CONFIG_IXGB_NAPI
 307         netif_poll_disable(netdev);
 308 #endif
 309         adapter->link_speed = 0;
 310         adapter->link_duplex = 0;
 311         netif_carrier_off(netdev);
 312         netif_stop_queue(netdev);
 313
 314         ixgb_reset(adapter);
 315         ixgb_clean_tx_ring(adapter);
 316         ixgb_clean_rx_ring(adapter);
 317 }
 318
 319 void
 320 ixgb_reset(struct ixgb_adapter *adapter)
 321 {
 322
 323         ixgb_adapter_stop(&adapter->hw);
 324         if(!ixgb_init_hw(&adapter->hw))
 325                 IXGB_DBG("ixgb_init_hw failed.\n");
 326 }
 327
 328 /**
 329  * ixgb_probe - Device Initialization Routine
 330  * @pdev: PCI device information struct
 331  * @ent: entry in ixgb_pci_tbl
 332  *
 333  * Returns 0 on success, negative on failure
 334  *
 335  * ixgb_probe initializes an adapter identified by a pci_dev structure.
 336  * The OS initialization, configuring of the adapter private structure,
 337  * and a hardware reset occur.
 338  **/
 339
 340 static int __devinit
 341 ixgb_probe(struct pci_dev *pdev,
 342                 const struct pci_device_id *ent)
 343 {
 344         struct net_device *netdev = NULL;
 345         struct ixgb_adapter *adapter;
 346         static int cards_found = 0;
 347         unsigned long mmio_start;
 348         int mmio_len;
 349         int pci_using_dac;
 350         int i;
 351         int err;
 352
 353         if((err = pci_enable_device(pdev)))
 354                 return err;
 355
 356         if(!(err = pci_set_dma_mask(pdev, DMA_64BIT_MASK))) {
 357                 pci_using_dac = 1;
 358         } else {
 359                 if((err = pci_set_dma_mask(pdev, DMA_32BIT_MASK))) {
 360                         IXGB_ERR("No usable DMA configuration, aborting\n");
 361                         return err;
 362                 }
 363                 pci_using_dac = 0;
 364         }
 365
 366         if((err = pci_request_regions(pdev, ixgb_driver_name)))
 367                 return err;
 368
 369         pci_set_master(pdev);
 370
 371         netdev = alloc_etherdev(sizeof(struct ixgb_adapter));
 372         if(!netdev) {
 373                 err = -ENOMEM;
 374                 goto err_alloc_etherdev;
 375         }
 376
 377         SET_MODULE_OWNER(netdev);
 378         SET_NETDEV_DEV(netdev, &pdev->dev);
 379
 380         pci_set_drvdata(pdev, netdev);
 381         adapter = netdev_priv(netdev);
 382         adapter->netdev = netdev;
 383         adapter->pdev = pdev;
 384         adapter->hw.back = adapter;
 385
 386         mmio_start = pci_resource_start(pdev, BAR_0);
 387         mmio_len = pci_resource_len(pdev, BAR_0);
 388
 389         adapter->hw.hw_addr = ioremap(mmio_start, mmio_len);
 390         if(!adapter->hw.hw_addr) {
 391                 err = -EIO;
 392                 goto err_ioremap;
 393         }
 394
 395         for(i = BAR_1; i <= BAR_5; i++) {
 396                 if(pci_resource_len(pdev, i) == 0)
 397                         continue;
 398                 if(pci_resource_flags(pdev, i) & IORESOURCE_IO) {
 399                         adapter->hw.io_base = pci_resource_start(pdev, i);
 400                         break;
 401                 }
 402         }
 403
 404         netdev->open = &ixgb_open;
 405         netdev->stop = &ixgb_close;
 406         netdev->hard_start_xmit = &ixgb_xmit_frame;
 407         netdev->get_stats = &ixgb_get_stats;
 408         netdev->set_multicast_list = &ixgb_set_multi;
 409         netdev->set_mac_address = &ixgb_set_mac;
 410         netdev->change_mtu = &ixgb_change_mtu;
 411         ixgb_set_ethtool_ops(netdev);
 412         netdev->tx_timeout = &ixgb_tx_timeout;
 413         netdev->watchdog_timeo = HZ;
 414 #ifdef CONFIG_IXGB_NAPI
 415         netdev->poll = &ixgb_clean;
 416         netdev->weight = 64;
 417 #endif
 418         netdev->vlan_rx_register = ixgb_vlan_rx_register;
 419         netdev->vlan_rx_add_vid = ixgb_vlan_rx_add_vid;
 420         netdev->vlan_rx_kill_vid = ixgb_vlan_rx_kill_vid;
 421 #ifdef CONFIG_NET_POLL_CONTROLLER
 422         netdev->poll_controller = ixgb_netpoll;
 423 #endif
 424
 425         netdev->mem_start = mmio_start;
 426         netdev->mem_end = mmio_start + mmio_len;
 427         netdev->base_addr = adapter->hw.io_base;
 428
 429         adapter->bd_number = cards_found;
 430         adapter->link_speed = 0;
 431         adapter->link_duplex = 0;
 432
 433         /* setup the private structure */
 434
 435         if((err = ixgb_sw_init(adapter)))
 436                 goto err_sw_init;
 437
 438         netdev->features = NETIF_F_SG |
 439                            NETIF_F_HW_CSUM |
 440                            NETIF_F_HW_VLAN_TX |
 441                            NETIF_F_HW_VLAN_RX |
 442                            NETIF_F_HW_VLAN_FILTER;
 443 #ifdef NETIF_F_TSO
 444         netdev->features |= NETIF_F_TSO;
 445 #endif
 446
 447         if(pci_using_dac)
 448                 netdev->features |= NETIF_F_HIGHDMA;
 449
 450         /* make sure the EEPROM is good */
 451
 452         if(!ixgb_validate_eeprom_checksum(&adapter->hw)) {
 453                 printk(KERN_ERR "The EEPROM Checksum Is Not Valid\n");
 454                 err = -EIO;
 455                 goto err_eeprom;
 456         }
 457
 458         ixgb_get_ee_mac_addr(&adapter->hw, netdev->dev_addr);
 459
 460         if(!is_valid_ether_addr(netdev->dev_addr)) {
 461                 err = -EIO;
 462                 goto err_eeprom;
 463         }
 464
 465         adapter->part_num = ixgb_get_ee_pba_number(&adapter->hw);
 466
 467         init_timer(&adapter->watchdog_timer);
 468         adapter->watchdog_timer.function = &ixgb_watchdog;
 469         adapter->watchdog_timer.data = (unsigned long)adapter;
 470
 471         INIT_WORK(&adapter->tx_timeout_task,
 472                   (void (*)(void *))ixgb_tx_timeout_task, netdev);
 473
 474         if((err = register_netdev(netdev)))
 475                 goto err_register;
 476
 477         /* we're going to reset, so assume we have no link for now */
 478
 479         netif_carrier_off(netdev);
 480         netif_stop_queue(netdev);
 481
 482         printk(KERN_INFO "%s: Intel(R) PRO/10GbE Network Connection\n",
 483                    netdev->name);
 484         ixgb_check_options(adapter);
 485         /* reset the hardware with the new settings */
 486
 487         ixgb_reset(adapter);
 488
 489         cards_found++;
 490         return 0;
 491
 492 err_register:
 493 err_sw_init:
 494 err_eeprom:
 495         iounmap(adapter->hw.hw_addr);
 496 err_ioremap:
 497         free_netdev(netdev);
 498 err_alloc_etherdev:
 499         pci_release_regions(pdev);
 500         return err;
 501 }
 502
 503 /**
 504  * ixgb_remove - Device Removal Routine
 505  * @pdev: PCI device information struct
 506  *
 507  * ixgb_remove is called by the PCI subsystem to alert the driver
 508  * that it should release a PCI device.  The could be caused by a
 509  * Hot-Plug event, or because the driver is going to be removed from
 510  * memory.
 511  **/
 512
 513 static void __devexit
 514 ixgb_remove(struct pci_dev *pdev)
 515 {
 516         struct net_device *netdev = pci_get_drvdata(pdev);
 517         struct ixgb_adapter *adapter = netdev_priv(netdev);
 518
 519         unregister_netdev(netdev);
 520
 521         iounmap(adapter->hw.hw_addr);
 522         pci_release_regions(pdev);
 523
 524         free_netdev(netdev);
 525 }
 526
 527 /**
 528  * ixgb_sw_init - Initialize general software structures (struct ixgb_adapter)
 529  * @adapter: board private structure to initialize
 530  *
 531  * ixgb_sw_init initializes the Adapter private data structure.
 532  * Fields are initialized based on PCI device information and
 533  * OS network device settings (MTU size).
 534  **/
 535
 536 static int __devinit
 537 ixgb_sw_init(struct ixgb_adapter *adapter)
 538 {
 539         struct ixgb_hw *hw = &adapter->hw;
 540         struct net_device *netdev = adapter->netdev;
 541         struct pci_dev *pdev = adapter->pdev;
 542
 543         /* PCI config space info */
 544
 545         hw->vendor_id = pdev->vendor;
 546         hw->device_id = pdev->device;
 547         hw->subsystem_vendor_id = pdev->subsystem_vendor;
 548         hw->subsystem_id = pdev->subsystem_device;
 549
 550         adapter->rx_buffer_len = IXGB_RXBUFFER_2048;
 551
 552         hw->max_frame_size = netdev->mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;
 553
 554         if((hw->device_id == IXGB_DEVICE_ID_82597EX)
 555            ||(hw->device_id == IXGB_DEVICE_ID_82597EX_LR)
 556            ||(hw->device_id == IXGB_DEVICE_ID_82597EX_SR))
 557                         hw->mac_type = ixgb_82597;
 558         else {
 559                 /* should never have loaded on this device */
 560                 printk(KERN_ERR "ixgb: unsupported device id\n");
 561         }
 562
 563         /* enable flow control to be programmed */
 564         hw->fc.send_xon = 1;
 565
 566         atomic_set(&adapter->irq_sem, 1);
 567         spin_lock_init(&adapter->tx_lock);
 568
 569         return 0;
 570 }
 571
 572 /**
 573  * ixgb_open - Called when a network interface is made active
 574  * @netdev: network interface device structure
 575  *
 576  * Returns 0 on success, negative value on failure
 577  *
 578  * The open entry point is called when a network interface is made
 579  * active by the system (IFF_UP).  At this point all resources needed
 580  * for transmit and receive operations are allocated, the interrupt
 581  * handler is registered with the OS, the watchdog timer is started,
 582  * and the stack is notified that the interface is ready.
 583  **/
 584
 585 static int
 586 ixgb_open(struct net_device *netdev)
 587 {
 588         struct ixgb_adapter *adapter = netdev_priv(netdev);
 589         int err;
 590
 591         /* allocate transmit descriptors */
 592
 593         if((err = ixgb_setup_tx_resources(adapter)))
 594                 goto err_setup_tx;
 595
 596         /* allocate receive descriptors */
 597
 598         if((err = ixgb_setup_rx_resources(adapter)))
 599                 goto err_setup_rx;
 600
 601         if((err = ixgb_up(adapter)))
 602                 goto err_up;
 603
 604         return 0;
 605
 606 err_up:
 607         ixgb_free_rx_resources(adapter);
 608 err_setup_rx:
 609         ixgb_free_tx_resources(adapter);
 610 err_setup_tx:
 611         ixgb_reset(adapter);
 612
 613         return err;
 614 }
 615
 616 /**
 617  * ixgb_close - Disables a network interface
 618  * @netdev: network interface device structure
 619  *
 620  * Returns 0, this is not allowed to fail
 621  *
 622  * The close entry point is called when an interface is de-activated
 623  * by the OS.  The hardware is still under the drivers control, but
 624  * needs to be disabled.  A global MAC reset is issued to stop the
 625  * hardware, and all transmit and receive resources are freed.
 626  **/
 627
 628 static int
 629 ixgb_close(struct net_device *netdev)
 630 {
 631         struct ixgb_adapter *adapter = netdev_priv(netdev);
 632
 633         ixgb_down(adapter, TRUE);
 634
 635         ixgb_free_tx_resources(adapter);
 636         ixgb_free_rx_resources(adapter);
 637
 638         return 0;
 639 }
 640
 641 /**
 642  * ixgb_setup_tx_resources - allocate Tx resources (Descriptors)
 643  * @adapter: board private structure
 644  *
 645  * Return 0 on success, negative on failure
 646  **/
 647
 648 int
 649 ixgb_setup_tx_resources(struct ixgb_adapter *adapter)
 650 {
 651         struct ixgb_desc_ring *txdr = &adapter->tx_ring;
 652         struct pci_dev *pdev = adapter->pdev;
 653         int size;
 654
 655         size = sizeof(struct ixgb_buffer) * txdr->count;
 656         txdr->buffer_info = vmalloc(size);
 657         if(!txdr->buffer_info) {
 658                 return -ENOMEM;
 659         }
 660         memset(txdr->buffer_info, 0, size);
 661
 662         /* round up to nearest 4K */
 663
 664         txdr->size = txdr->count * sizeof(struct ixgb_tx_desc);
 665         IXGB_ROUNDUP(txdr->size, 4096);
 666
 667         txdr->desc = pci_alloc_consistent(pdev, txdr->size, &txdr->dma);
 668         if(!txdr->desc) {
 669                 vfree(txdr->buffer_info);
 670                 return -ENOMEM;
 671         }
 672         memset(txdr->desc, 0, txdr->size);
 673
 674         txdr->next_to_use = 0;
 675         txdr->next_to_clean = 0;
 676
 677         return 0;
 678 }
 679
 680 /**
 681  * ixgb_configure_tx - Configure 82597 Transmit Unit after Reset.
 682  * @adapter: board private structure
 683  *
 684  * Configure the Tx unit of the MAC after a reset.
 685  **/
 686
 687 static void
 688 ixgb_configure_tx(struct ixgb_adapter *adapter)
 689 {
 690         uint64_t tdba = adapter->tx_ring.dma;
 691         uint32_t tdlen = adapter->tx_ring.count * sizeof(struct ixgb_tx_desc);
 692         uint32_t tctl;
 693         struct ixgb_hw *hw = &adapter->hw;
 694
 695         /* Setup the Base and Length of the Tx Descriptor Ring
 696          * tx_ring.dma can be either a 32 or 64 bit value
 697          */
 698
 699         IXGB_WRITE_REG(hw, TDBAL, (tdba & 0x00000000ffffffffULL));
 700         IXGB_WRITE_REG(hw, TDBAH, (tdba >> 32));
 701
 702         IXGB_WRITE_REG(hw, TDLEN, tdlen);
 703
 704         /* Setup the HW Tx Head and Tail descriptor pointers */
 705
 706         IXGB_WRITE_REG(hw, TDH, 0);
 707         IXGB_WRITE_REG(hw, TDT, 0);
 708
 709         /* don't set up txdctl, it induces performance problems if configured
 710          * incorrectly */
 711         /* Set the Tx Interrupt Delay register */
 712
 713         IXGB_WRITE_REG(hw, TIDV, adapter->tx_int_delay);
 714
 715         /* Program the Transmit Control Register */
 716
 717         tctl = IXGB_TCTL_TCE | IXGB_TCTL_TXEN | IXGB_TCTL_TPDE;
 718         IXGB_WRITE_REG(hw, TCTL, tctl);
 719
 720         /* Setup Transmit Descriptor Settings for this adapter */
 721         adapter->tx_cmd_type =
 722                 IXGB_TX_DESC_TYPE
 723                 | (adapter->tx_int_delay_enable ? IXGB_TX_DESC_CMD_IDE : 0);
 724 }
 725
 726 /**
 727  * ixgb_setup_rx_resources - allocate Rx resources (Descriptors)
 728  * @adapter: board private structure
 729  *
 730  * Returns 0 on success, negative on failure
 731  **/
 732
 733 int
 734 ixgb_setup_rx_resources(struct ixgb_adapter *adapter)
 735 {
 736         struct ixgb_desc_ring *rxdr = &adapter->rx_ring;
 737         struct pci_dev *pdev = adapter->pdev;
 738         int size;
 739
 740         size = sizeof(struct ixgb_buffer) * rxdr->count;
 741         rxdr->buffer_info = vmalloc(size);
 742         if(!rxdr->buffer_info) {
 743                 return -ENOMEM;
 744         }
 745         memset(rxdr->buffer_info, 0, size);
 746
 747         /* Round up to nearest 4K */
 748
 749         rxdr->size = rxdr->count * sizeof(struct ixgb_rx_desc);
 750         IXGB_ROUNDUP(rxdr->size, 4096);
 751
 752         rxdr->desc = pci_alloc_consistent(pdev, rxdr->size, &rxdr->dma);
 753
 754         if(!rxdr->desc) {
 755                 vfree(rxdr->buffer_info);
 756                 return -ENOMEM;
 757         }
 758         memset(rxdr->desc, 0, rxdr->size);
 759
 760         rxdr->next_to_clean = 0;
 761         rxdr->next_to_use = 0;
 762
 763         return 0;
 764 }
 765
 766 /**
 767  * ixgb_setup_rctl - configure the receive control register
 768  * @adapter: Board private structure
 769  **/
 770
 771 static void
 772 ixgb_setup_rctl(struct ixgb_adapter *adapter)
 773 {
 774         uint32_t rctl;
 775
 776         rctl = IXGB_READ_REG(&adapter->hw, RCTL);
 777
 778         rctl &= ~(3 << IXGB_RCTL_MO_SHIFT);
 779
 780         rctl |=
 781                 IXGB_RCTL_BAM | IXGB_RCTL_RDMTS_1_2 |
 782                 IXGB_RCTL_RXEN | IXGB_RCTL_CFF |
 783                 (adapter->hw.mc_filter_type << IXGB_RCTL_MO_SHIFT);
 784
 785         rctl |= IXGB_RCTL_SECRC;
 786
 787         switch (adapter->rx_buffer_len) {
 788         case IXGB_RXBUFFER_2048:
 789         default:
 790                 rctl |= IXGB_RCTL_BSIZE_2048;
 791                 break;
 792         case IXGB_RXBUFFER_4096:
 793                 rctl |= IXGB_RCTL_BSIZE_4096;
 794                 break;
 795         case IXGB_RXBUFFER_8192:
 796                 rctl |= IXGB_RCTL_BSIZE_8192;
 797                 break;
 798         case IXGB_RXBUFFER_16384:
 799                 rctl |= IXGB_RCTL_BSIZE_16384;
 800                 break;
 801         }
 802
 803         IXGB_WRITE_REG(&adapter->hw, RCTL, rctl);
 804 }
 805
 806 /**
 807  * ixgb_configure_rx - Configure 82597 Receive Unit after Reset.
 808  * @adapter: board private structure
 809  *
 810  * Configure the Rx unit of the MAC after a reset.
 811  **/
 812
 813 static void
 814 ixgb_configure_rx(struct ixgb_adapter *adapter)
 815 {
 816         uint64_t rdba = adapter->rx_ring.dma;
 817         uint32_t rdlen = adapter->rx_ring.count * sizeof(struct ixgb_rx_desc);
 818         struct ixgb_hw *hw = &adapter->hw;
 819         uint32_t rctl;
 820         uint32_t rxcsum;
 821         uint32_t rxdctl;
 822
 823         /* make sure receives are disabled while setting up the descriptors */
 824
 825         rctl = IXGB_READ_REG(hw, RCTL);
 826         IXGB_WRITE_REG(hw, RCTL, rctl & ~IXGB_RCTL_RXEN);
 827
 828         /* set the Receive Delay Timer Register */
 829
 830         IXGB_WRITE_REG(hw, RDTR, adapter->rx_int_delay);
 831
 832         /* Setup the Base and Length of the Rx Descriptor Ring */
 833
 834         IXGB_WRITE_REG(hw, RDBAL, (rdba & 0x00000000ffffffffULL));
 835         IXGB_WRITE_REG(hw, RDBAH, (rdba >> 32));
 836
 837         IXGB_WRITE_REG(hw, RDLEN, rdlen);
 838
 839         /* Setup the HW Rx Head and Tail Descriptor Pointers */
 840         IXGB_WRITE_REG(hw, RDH, 0);
 841         IXGB_WRITE_REG(hw, RDT, 0);
 842
 843         /* set up pre-fetching of receive buffers so we get some before we
 844          * run out (default hardware behavior is to run out before fetching
 845          * more).  This sets up to fetch if HTHRESH rx descriptors are avail
 846          * and the descriptors in hw cache are below PTHRESH.  This avoids
 847          * the hardware behavior of fetching <=512 descriptors in a single
 848          * burst that pre-empts all other activity, usually causing fifo
 849          * overflows. */
 850         /* use WTHRESH to burst write 16 descriptors or burst when RXT0 */
 851         rxdctl = RXDCTL_WTHRESH_DEFAULT << IXGB_RXDCTL_WTHRESH_SHIFT |
 852                  RXDCTL_HTHRESH_DEFAULT << IXGB_RXDCTL_HTHRESH_SHIFT |
 853                  RXDCTL_PTHRESH_DEFAULT << IXGB_RXDCTL_PTHRESH_SHIFT;
 854         IXGB_WRITE_REG(hw, RXDCTL, rxdctl);
 855
 856         /* Enable Receive Checksum Offload for TCP and UDP */
 857         if(adapter->rx_csum == TRUE) {
 858                 rxcsum = IXGB_READ_REG(hw, RXCSUM);
 859                 rxcsum |= IXGB_RXCSUM_TUOFL;
 860                 IXGB_WRITE_REG(hw, RXCSUM, rxcsum);
 861         }
 862
 863         /* Enable Receives */
 864
 865         IXGB_WRITE_REG(hw, RCTL, rctl);
 866 }
 867
 868 /**
 869  * ixgb_free_tx_resources - Free Tx Resources
 870  * @adapter: board private structure
 871  *
 872  * Free all transmit software resources
 873  **/
 874
 875 void
 876 ixgb_free_tx_resources(struct ixgb_adapter *adapter)
 877 {
 878         struct pci_dev *pdev = adapter->pdev;
 879
 880         ixgb_clean_tx_ring(adapter);
 881
 882         vfree(adapter->tx_ring.buffer_info);
 883         adapter->tx_ring.buffer_info = NULL;
 884
 885         pci_free_consistent(pdev, adapter->tx_ring.size,
 886                             adapter->tx_ring.desc, adapter->tx_ring.dma);
 887
 888         adapter->tx_ring.desc = NULL;
 889 }
 890
 891 static inline void
 892 ixgb_unmap_and_free_tx_resource(struct ixgb_adapter *adapter,
 893                                         struct ixgb_buffer *buffer_info)
 894 {
 895         struct pci_dev *pdev = adapter->pdev;
 896         if(buffer_info->dma) {
 897                 pci_unmap_page(pdev,
 898                            buffer_info->dma,
 899                            buffer_info->length,
 900                            PCI_DMA_TODEVICE);
 901                 buffer_info->dma = 0;
 902         }
 903         if(buffer_info->skb) {
 904                 dev_kfree_skb_any(buffer_info->skb);
 905                 buffer_info->skb = NULL;
 906         }
 907 }
 908
 909 /**
 910  * ixgb_clean_tx_ring - Free Tx Buffers
 911  * @adapter: board private structure
 912  **/
 913
 914 static void
 915 ixgb_clean_tx_ring(struct ixgb_adapter *adapter)
 916 {
 917         struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
 918         struct ixgb_buffer *buffer_info;
 919         unsigned long size;
 920         unsigned int i;
 921
 922         /* Free all the Tx ring sk_buffs */
 923
 924         for(i = 0; i < tx_ring->count; i++) {
 925                 buffer_info = &tx_ring->buffer_info[i];
 926                 ixgb_unmap_and_free_tx_resource(adapter, buffer_info);
 927         }
 928
 929         size = sizeof(struct ixgb_buffer) * tx_ring->count;
 930         memset(tx_ring->buffer_info, 0, size);
 931
 932         /* Zero out the descriptor ring */
 933
 934         memset(tx_ring->desc, 0, tx_ring->size);
 935
 936         tx_ring->next_to_use = 0;
 937         tx_ring->next_to_clean = 0;
 938
 939         IXGB_WRITE_REG(&adapter->hw, TDH, 0);
 940         IXGB_WRITE_REG(&adapter->hw, TDT, 0);
 941 }
 942
 943 /**
 944  * ixgb_free_rx_resources - Free Rx Resources
 945  * @adapter: board private structure
 946  *
 947  * Free all receive software resources
 948  **/
 949
 950 void
 951 ixgb_free_rx_resources(struct ixgb_adapter *adapter)
 952 {
 953         struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
 954         struct pci_dev *pdev = adapter->pdev;
 955
 956         ixgb_clean_rx_ring(adapter);
 957
 958         vfree(rx_ring->buffer_info);
 959         rx_ring->buffer_info = NULL;
 960
 961         pci_free_consistent(pdev, rx_ring->size, rx_ring->desc, rx_ring->dma);
 962
 963         rx_ring->desc = NULL;
 964 }
 965
 966 /**
 967  * ixgb_clean_rx_ring - Free Rx Buffers
 968  * @adapter: board private structure
 969  **/
 970
 971 static void
 972 ixgb_clean_rx_ring(struct ixgb_adapter *adapter)
 973 {
 974         struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
 975         struct ixgb_buffer *buffer_info;
 976         struct pci_dev *pdev = adapter->pdev;
 977         unsigned long size;
 978         unsigned int i;
 979
 980         /* Free all the Rx ring sk_buffs */
 981
 982         for(i = 0; i < rx_ring->count; i++) {
 983                 buffer_info = &rx_ring->buffer_info[i];
 984                 if(buffer_info->skb) {
 985
 986                         pci_unmap_single(pdev,
 987                                          buffer_info->dma,
 988                                          buffer_info->length,
 989                                          PCI_DMA_FROMDEVICE);
 990
 991                         dev_kfree_skb(buffer_info->skb);
 992
 993                         buffer_info->skb = NULL;
 994                 }
 995         }
 996
 997         size = sizeof(struct ixgb_buffer) * rx_ring->count;
 998         memset(rx_ring->buffer_info, 0, size);
 999
1000         /* Zero out the descriptor ring */
1001
1002         memset(rx_ring->desc, 0, rx_ring->size);
1003
1004         rx_ring->next_to_clean = 0;
1005         rx_ring->next_to_use = 0;
1006
1007         IXGB_WRITE_REG(&adapter->hw, RDH, 0);
1008         IXGB_WRITE_REG(&adapter->hw, RDT, 0);
1009 }
1010
1011 /**
1012  * ixgb_set_mac - Change the Ethernet Address of the NIC
1013  * @netdev: network interface device structure
1014  * @p: pointer to an address structure
1015  *
1016  * Returns 0 on success, negative on failure
1017  **/
1018
1019 static int
1020 ixgb_set_mac(struct net_device *netdev, void *p)
1021 {
1022         struct ixgb_adapter *adapter = netdev_priv(netdev);
1023         struct sockaddr *addr = p;
1024
1025         if(!is_valid_ether_addr(addr->sa_data))
1026                 return -EADDRNOTAVAIL;
1027
1028         memcpy(netdev->dev_addr, addr->sa_data, netdev->addr_len);
1029
1030         ixgb_rar_set(&adapter->hw, addr->sa_data, 0);
1031
1032         return 0;
1033 }
1034
1035 /**
1036  * ixgb_set_multi - Multicast and Promiscuous mode set
1037  * @netdev: network interface device structure
1038  *
1039  * The set_multi entry point is called whenever the multicast address
1040  * list or the network interface flags are updated.  This routine is
1041  * responsible for configuring the hardware for proper multicast,
1042  * promiscuous mode, and all-multi behavior.
1043  **/
1044
1045 static void
1046 ixgb_set_multi(struct net_device *netdev)
1047 {
1048         struct ixgb_adapter *adapter = netdev_priv(netdev);
1049         struct ixgb_hw *hw = &adapter->hw;
1050         struct dev_mc_list *mc_ptr;
1051         uint32_t rctl;
1052         int i;
1053
1054         /* Check for Promiscuous and All Multicast modes */
1055
1056         rctl = IXGB_READ_REG(hw, RCTL);
1057
1058         if(netdev->flags & IFF_PROMISC) {
1059                 rctl |= (IXGB_RCTL_UPE | IXGB_RCTL_MPE);
1060         } else if(netdev->flags & IFF_ALLMULTI) {
1061                 rctl |= IXGB_RCTL_MPE;
1062                 rctl &= ~IXGB_RCTL_UPE;
1063         } else {
1064                 rctl &= ~(IXGB_RCTL_UPE | IXGB_RCTL_MPE);
1065         }
1066
1067         if(netdev->mc_count > IXGB_MAX_NUM_MULTICAST_ADDRESSES) {
1068                 rctl |= IXGB_RCTL_MPE;
1069                 IXGB_WRITE_REG(hw, RCTL, rctl);
1070         } else {
1071                 uint8_t mta[netdev->mc_count * IXGB_ETH_LENGTH_OF_ADDRESS];
1072
1073                 IXGB_WRITE_REG(hw, RCTL, rctl);
1074
1075                 for(i = 0, mc_ptr = netdev->mc_list; mc_ptr;
1076                         i++, mc_ptr = mc_ptr->next)
1077                         memcpy(&mta[i * IXGB_ETH_LENGTH_OF_ADDRESS],
1078                                    mc_ptr->dmi_addr, IXGB_ETH_LENGTH_OF_ADDRESS);
1079
1080                 ixgb_mc_addr_list_update(hw, mta, netdev->mc_count, 0);
1081         }
1082 }
1083
1084 /**
1085  * ixgb_watchdog - Timer Call-back
1086  * @data: pointer to netdev cast into an unsigned long
1087  **/
1088
1089 static void
1090 ixgb_watchdog(unsigned long data)
1091 {
1092         struct ixgb_adapter *adapter = (struct ixgb_adapter *)data;
1093         struct net_device *netdev = adapter->netdev;
1094         struct ixgb_desc_ring *txdr = &adapter->tx_ring;
1095
1096         ixgb_check_for_link(&adapter->hw);
1097
1098         if (ixgb_check_for_bad_link(&adapter->hw)) {
1099                 /* force the reset path */
1100                 netif_stop_queue(netdev);
1101         }
1102
1103         if(adapter->hw.link_up) {
1104                 if(!netif_carrier_ok(netdev)) {
1105                         printk(KERN_INFO "ixgb: %s NIC Link is Up %d Mbps %s\n",
1106                                    netdev->name, 10000, "Full Duplex");
1107                         adapter->link_speed = 10000;
1108                         adapter->link_duplex = FULL_DUPLEX;
1109                         netif_carrier_on(netdev);
1110                         netif_wake_queue(netdev);
1111                 }
1112         } else {
1113                 if(netif_carrier_ok(netdev)) {
1114                         adapter->link_speed = 0;
1115                         adapter->link_duplex = 0;
1116                         printk(KERN_INFO
1117                                    "ixgb: %s NIC Link is Down\n",
1118                                    netdev->name);
1119                         netif_carrier_off(netdev);
1120                         netif_stop_queue(netdev);
1121
1122                 }
1123         }
1124
1125         ixgb_update_stats(adapter);
1126
1127         if(!netif_carrier_ok(netdev)) {
1128                 if(IXGB_DESC_UNUSED(txdr) + 1 < txdr->count) {
1129                         /* We've lost link, so the controller stops DMA,
1130                          * but we've got queued Tx work that's never going
1131                          * to get done, so reset controller to flush Tx.
1132                          * (Do the reset outside of interrupt context). */
1133                         schedule_work(&adapter->tx_timeout_task);
1134                 }
1135         }
1136
1137         /* Force detection of hung controller every watchdog period */
1138         adapter->detect_tx_hung = TRUE;
1139
1140         /* generate an interrupt to force clean up of any stragglers */
1141         IXGB_WRITE_REG(&adapter->hw, ICS, IXGB_INT_TXDW);
1142
1143         /* Reset the timer */
1144         mod_timer(&adapter->watchdog_timer, jiffies + 2 * HZ);
1145 }
1146
1147 #define IXGB_TX_FLAGS_CSUM              0x00000001
1148 #define IXGB_TX_FLAGS_VLAN              0x00000002
1149 #define IXGB_TX_FLAGS_TSO               0x00000004
1150
1151 static inline int
1152 ixgb_tso(struct ixgb_adapter *adapter, struct sk_buff *skb)
1153 {
1154 #ifdef NETIF_F_TSO
1155         struct ixgb_context_desc *context_desc;
1156         unsigned int i;
1157         uint8_t ipcss, ipcso, tucss, tucso, hdr_len;
1158         uint16_t ipcse, tucse, mss;
1159         int err;
1160
1161         if(likely(skb_shinfo(skb)->tso_size)) {
1162                 if (skb_header_cloned(skb)) {
1163                         err = pskb_expand_head(skb, 0, 0, GFP_ATOMIC);
1164                         if (err)
1165                                 return err;
1166                 }
1167
1168                 hdr_len = ((skb->h.raw - skb->data) + (skb->h.th->doff << 2));
1169                 mss = skb_shinfo(skb)->tso_size;
1170                 skb->nh.iph->tot_len = 0;
1171                 skb->nh.iph->check = 0;
1172                 skb->h.th->check = ~csum_tcpudp_magic(skb->nh.iph->saddr,
1173                                                       skb->nh.iph->daddr,
1174                                                       0, IPPROTO_TCP, 0);
1175                 ipcss = skb->nh.raw - skb->data;
1176                 ipcso = (void *)&(skb->nh.iph->check) - (void *)skb->data;
1177                 ipcse = skb->h.raw - skb->data - 1;
1178                 tucss = skb->h.raw - skb->data;
1179                 tucso = (void *)&(skb->h.th->check) - (void *)skb->data;
1180                 tucse = 0;
1181
1182                 i = adapter->tx_ring.next_to_use;
1183                 context_desc = IXGB_CONTEXT_DESC(adapter->tx_ring, i);
1184
1185                 context_desc->ipcss = ipcss;
1186                 context_desc->ipcso = ipcso;
1187                 context_desc->ipcse = cpu_to_le16(ipcse);
1188                 context_desc->tucss = tucss;
1189                 context_desc->tucso = tucso;
1190                 context_desc->tucse = cpu_to_le16(tucse);
1191                 context_desc->mss = cpu_to_le16(mss);
1192                 context_desc->hdr_len = hdr_len;
1193                 context_desc->status = 0;
1194                 context_desc->cmd_type_len = cpu_to_le32(
1195                                                   IXGB_CONTEXT_DESC_TYPE
1196                                                 | IXGB_CONTEXT_DESC_CMD_TSE
1197                                                 | IXGB_CONTEXT_DESC_CMD_IP
1198                                                 | IXGB_CONTEXT_DESC_CMD_TCP
1199                                                 | IXGB_CONTEXT_DESC_CMD_IDE
1200                                                 | (skb->len - (hdr_len)));
1201
1202
1203                 if(++i == adapter->tx_ring.count) i = 0;
1204                 adapter->tx_ring.next_to_use = i;
1205
1206                 return 1;
1207         }
1208 #endif
1209
1210         return 0;
1211 }
1212
1213 static inline boolean_t
1214 ixgb_tx_csum(struct ixgb_adapter *adapter, struct sk_buff *skb)
1215 {
1216         struct ixgb_context_desc *context_desc;
1217         unsigned int i;
1218         uint8_t css, cso;
1219
1220         if(likely(skb->ip_summed == CHECKSUM_HW)) {
1221                 css = skb->h.raw - skb->data;
1222                 cso = (skb->h.raw + skb->csum) - skb->data;
1223
1224                 i = adapter->tx_ring.next_to_use;
1225                 context_desc = IXGB_CONTEXT_DESC(adapter->tx_ring, i);
1226
1227                 context_desc->tucss = css;
1228                 context_desc->tucso = cso;
1229                 context_desc->tucse = 0;
1230                 /* zero out any previously existing data in one instruction */
1231                 *(uint32_t *)&(context_desc->ipcss) = 0;
1232                 context_desc->status = 0;
1233                 context_desc->hdr_len = 0;
1234                 context_desc->mss = 0;
1235                 context_desc->cmd_type_len =
1236                         cpu_to_le32(IXGB_CONTEXT_DESC_TYPE
1237                                     | IXGB_TX_DESC_CMD_IDE);
1238
1239                 if(++i == adapter->tx_ring.count) i = 0;
1240                 adapter->tx_ring.next_to_use = i;
1241
1242                 return TRUE;
1243         }
1244
1245         return FALSE;
1246 }
1247
1248 #define IXGB_MAX_TXD_PWR        14
1249 #define IXGB_MAX_DATA_PER_TXD   (1<<IXGB_MAX_TXD_PWR)
1250
1251 static inline int
1252 ixgb_tx_map(struct ixgb_adapter *adapter, struct sk_buff *skb,
1253             unsigned int first)
1254 {
1255         struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
1256         struct ixgb_buffer *buffer_info;
1257         int len = skb->len;
1258         unsigned int offset = 0, size, count = 0, i;
1259
1260         unsigned int nr_frags = skb_shinfo(skb)->nr_frags;
1261         unsigned int f;
1262
1263         len -= skb->data_len;
1264
1265         i = tx_ring->next_to_use;
1266
1267         while(len) {
1268                 buffer_info = &tx_ring->buffer_info[i];
1269                 size = min(len, IXGB_MAX_JUMBO_FRAME_SIZE);
1270                 buffer_info->length = size;
1271                 buffer_info->dma =
1272                         pci_map_single(adapter->pdev,
1273                                 skb->data + offset,
1274                                 size,
1275                                 PCI_DMA_TODEVICE);
1276                 buffer_info->time_stamp = jiffies;
1277
1278                 len -= size;
1279                 offset += size;
1280                 count++;
1281                 if(++i == tx_ring->count) i = 0;
1282         }
1283
1284         for(f = 0; f < nr_frags; f++) {
1285                 struct skb_frag_struct *frag;
1286
1287                 frag = &skb_shinfo(skb)->frags[f];
1288                 len = frag->size;
1289                 offset = 0;
1290
1291                 while(len) {
1292                         buffer_info = &tx_ring->buffer_info[i];
1293                         size = min(len, IXGB_MAX_JUMBO_FRAME_SIZE);
1294                         buffer_info->length = size;
1295                         buffer_info->dma =
1296                                 pci_map_page(adapter->pdev,
1297                                         frag->page,
1298                                         frag->page_offset + offset,
1299                                         size,
1300                                         PCI_DMA_TODEVICE);
1301                         buffer_info->time_stamp = jiffies;
1302
1303                         len -= size;
1304                         offset += size;
1305                         count++;
1306                         if(++i == tx_ring->count) i = 0;
1307                 }
1308         }
1309         i = (i == 0) ? tx_ring->count - 1 : i - 1;
1310         tx_ring->buffer_info[i].skb = skb;
1311         tx_ring->buffer_info[first].next_to_watch = i;
1312
1313         return count;
1314 }
1315
1316 static inline void
1317 ixgb_tx_queue(struct ixgb_adapter *adapter, int count, int vlan_id,int tx_flags)
1318 {
1319         struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
1320         struct ixgb_tx_desc *tx_desc = NULL;
1321         struct ixgb_buffer *buffer_info;
1322         uint32_t cmd_type_len = adapter->tx_cmd_type;
1323         uint8_t status = 0;
1324         uint8_t popts = 0;
1325         unsigned int i;
1326
1327         if(tx_flags & IXGB_TX_FLAGS_TSO) {
1328                 cmd_type_len |= IXGB_TX_DESC_CMD_TSE;
1329                 popts |= (IXGB_TX_DESC_POPTS_IXSM | IXGB_TX_DESC_POPTS_TXSM);
1330         }
1331
1332         if(tx_flags & IXGB_TX_FLAGS_CSUM)
1333                 popts |= IXGB_TX_DESC_POPTS_TXSM;
1334
1335         if(tx_flags & IXGB_TX_FLAGS_VLAN) {
1336                 cmd_type_len |= IXGB_TX_DESC_CMD_VLE;
1337         }
1338
1339         i = tx_ring->next_to_use;
1340
1341         while(count--) {
1342                 buffer_info = &tx_ring->buffer_info[i];
1343                 tx_desc = IXGB_TX_DESC(*tx_ring, i);
1344                 tx_desc->buff_addr = cpu_to_le64(buffer_info->dma);
1345                 tx_desc->cmd_type_len =
1346                         cpu_to_le32(cmd_type_len | buffer_info->length);
1347                 tx_desc->status = status;
1348                 tx_desc->popts = popts;
1349                 tx_desc->vlan = cpu_to_le16(vlan_id);
1350
1351                 if(++i == tx_ring->count) i = 0;
1352         }
1353
1354         tx_desc->cmd_type_len |= cpu_to_le32(IXGB_TX_DESC_CMD_EOP
1355                                 | IXGB_TX_DESC_CMD_RS );
1356
1357         /* Force memory writes to complete before letting h/w
1358          * know there are new descriptors to fetch.  (Only
1359          * applicable for weak-ordered memory model archs,
1360          * such as IA-64). */
1361         wmb();
1362
1363         tx_ring->next_to_use = i;
1364         IXGB_WRITE_REG(&adapter->hw, TDT, i);
1365 }
1366
1367 /* Tx Descriptors needed, worst case */
1368 #define TXD_USE_COUNT(S) (((S) >> IXGB_MAX_TXD_PWR) + \
1369                          (((S) & (IXGB_MAX_DATA_PER_TXD - 1)) ? 1 : 0))
1370 #define DESC_NEEDED TXD_USE_COUNT(IXGB_MAX_DATA_PER_TXD) + \
1371         MAX_SKB_FRAGS * TXD_USE_COUNT(PAGE_SIZE) + 1
1372
1373 static int
1374 ixgb_xmit_frame(struct sk_buff *skb, struct net_device *netdev)
1375 {
1376         struct ixgb_adapter *adapter = netdev_priv(netdev);
1377         unsigned int first;
1378         unsigned int tx_flags = 0;
1379         unsigned long flags;
1380         int vlan_id = 0;
1381         int tso;
1382
1383         if(skb->len <= 0) {
1384                 dev_kfree_skb_any(skb);
1385                 return 0;
1386         }
1387
1388         spin_lock_irqsave(&adapter->tx_lock, flags);
1389         if(unlikely(IXGB_DESC_UNUSED(&adapter->tx_ring) < DESC_NEEDED)) {
1390                 netif_stop_queue(netdev);
1391                 spin_unlock_irqrestore(&adapter->tx_lock, flags);
1392                 return 1;
1393         }
1394         spin_unlock_irqrestore(&adapter->tx_lock, flags);
1395
1396         if(adapter->vlgrp && vlan_tx_tag_present(skb)) {
1397                 tx_flags |= IXGB_TX_FLAGS_VLAN;
1398                 vlan_id = vlan_tx_tag_get(skb);
1399         }
1400
1401         first = adapter->tx_ring.next_to_use;
1402
1403         tso = ixgb_tso(adapter, skb);
1404         if (tso < 0) {
1405                 dev_kfree_skb_any(skb);
1406                 return NETDEV_TX_OK;
1407         }
1408
1409         if (tso)
1410                 tx_flags |= IXGB_TX_FLAGS_TSO;
1411         else if(ixgb_tx_csum(adapter, skb))
1412                 tx_flags |= IXGB_TX_FLAGS_CSUM;
1413
1414         ixgb_tx_queue(adapter, ixgb_tx_map(adapter, skb, first), vlan_id,
1415                         tx_flags);
1416
1417         netdev->trans_start = jiffies;
1418
1419         return 0;
1420 }
1421
1422 /**
1423  * ixgb_tx_timeout - Respond to a Tx Hang
1424  * @netdev: network interface device structure
1425  **/
1426
1427 static void
1428 ixgb_tx_timeout(struct net_device *netdev)
1429 {
1430         struct ixgb_adapter *adapter = netdev_priv(netdev);
1431
1432         /* Do the reset outside of interrupt context */
1433         schedule_work(&adapter->tx_timeout_task);
1434 }
1435
1436 static void
1437 ixgb_tx_timeout_task(struct net_device *netdev)
1438 {
1439         struct ixgb_adapter *adapter = netdev_priv(netdev);
1440
1441         ixgb_down(adapter, TRUE);
1442         ixgb_up(adapter);
1443 }
1444
1445 /**
1446  * ixgb_get_stats - Get System Network Statistics
1447  * @netdev: network interface device structure
1448  *
1449  * Returns the address of the device statistics structure.
1450  * The statistics are actually updated from the timer callback.
1451  **/
1452
1453 static struct net_device_stats *
1454 ixgb_get_stats(struct net_device *netdev)
1455 {
1456         struct ixgb_adapter *adapter = netdev_priv(netdev);
1457
1458         return &adapter->net_stats;
1459 }
1460
1461 /**
1462  * ixgb_change_mtu - Change the Maximum Transfer Unit
1463  * @netdev: network interface device structure
1464  * @new_mtu: new value for maximum frame size
1465  *
1466  * Returns 0 on success, negative on failure
1467  **/
1468
1469 static int
1470 ixgb_change_mtu(struct net_device *netdev, int new_mtu)
1471 {
1472         struct ixgb_adapter *adapter = netdev_priv(netdev);
1473         int max_frame = new_mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;
1474         int old_max_frame = netdev->mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;
1475
1476
1477         if((max_frame < IXGB_MIN_ENET_FRAME_SIZE_WITHOUT_FCS + ENET_FCS_LENGTH)
1478            || (max_frame > IXGB_MAX_JUMBO_FRAME_SIZE + ENET_FCS_LENGTH)) {
1479                 IXGB_ERR("Invalid MTU setting\n");
1480                 return -EINVAL;
1481         }
1482
1483         if((max_frame <= IXGB_MAX_ENET_FRAME_SIZE_WITHOUT_FCS + ENET_FCS_LENGTH)
1484            || (max_frame <= IXGB_RXBUFFER_2048)) {
1485                 adapter->rx_buffer_len = IXGB_RXBUFFER_2048;
1486
1487         } else if(max_frame <= IXGB_RXBUFFER_4096) {
1488                 adapter->rx_buffer_len = IXGB_RXBUFFER_4096;
1489
1490         } else if(max_frame <= IXGB_RXBUFFER_8192) {
1491                 adapter->rx_buffer_len = IXGB_RXBUFFER_8192;
1492
1493         } else {
1494                 adapter->rx_buffer_len = IXGB_RXBUFFER_16384;
1495         }
1496
1497         netdev->mtu = new_mtu;
1498
1499         if(old_max_frame != max_frame && netif_running(netdev)) {
1500
1501                 ixgb_down(adapter, TRUE);
1502                 ixgb_up(adapter);
1503         }
1504
1505         return 0;
1506 }
1507
1508 /**
1509  * ixgb_update_stats - Update the board statistics counters.
1510  * @adapter: board private structure
1511  **/
1512
1513 void
1514 ixgb_update_stats(struct ixgb_adapter *adapter)
1515 {
1516         struct net_device *netdev = adapter->netdev;
1517
1518         if((netdev->flags & IFF_PROMISC) || (netdev->flags & IFF_ALLMULTI) ||
1519            (netdev->mc_count > IXGB_MAX_NUM_MULTICAST_ADDRESSES)) {
1520                 u64 multi = IXGB_READ_REG(&adapter->hw, MPRCL);
1521                 u32 bcast_l = IXGB_READ_REG(&adapter->hw, BPRCL);
1522                 u32 bcast_h = IXGB_READ_REG(&adapter->hw, BPRCH);
1523                 u64 bcast = ((u64)bcast_h << 32) | bcast_l;
1524
1525                 multi |= ((u64)IXGB_READ_REG(&adapter->hw, MPRCH) << 32);
1526                 /* fix up multicast stats by removing broadcasts */
1527                 if(multi >= bcast)
1528                         multi -= bcast;
1529
1530                 adapter->stats.mprcl += (multi & 0xFFFFFFFF);
1531                 adapter->stats.mprch += (multi >> 32);
1532                 adapter->stats.bprcl += bcast_l;
1533                 adapter->stats.bprch += bcast_h;
1534         } else {
1535                 adapter->stats.mprcl += IXGB_READ_REG(&adapter->hw, MPRCL);
1536                 adapter->stats.mprch += IXGB_READ_REG(&adapter->hw, MPRCH);
1537                 adapter->stats.bprcl += IXGB_READ_REG(&adapter->hw, BPRCL);
1538                 adapter->stats.bprch += IXGB_READ_REG(&adapter->hw, BPRCH);
1539         }
1540         adapter->stats.tprl += IXGB_READ_REG(&adapter->hw, TPRL);
1541         adapter->stats.tprh += IXGB_READ_REG(&adapter->hw, TPRH);
1542         adapter->stats.gprcl += IXGB_READ_REG(&adapter->hw, GPRCL);
1543         adapter->stats.gprch += IXGB_READ_REG(&adapter->hw, GPRCH);
1544         adapter->stats.uprcl += IXGB_READ_REG(&adapter->hw, UPRCL);
1545         adapter->stats.uprch += IXGB_READ_REG(&adapter->hw, UPRCH);
1546         adapter->stats.vprcl += IXGB_READ_REG(&adapter->hw, VPRCL);
1547         adapter->stats.vprch += IXGB_READ_REG(&adapter->hw, VPRCH);
1548         adapter->stats.jprcl += IXGB_READ_REG(&adapter->hw, JPRCL);
1549         adapter->stats.jprch += IXGB_READ_REG(&adapter->hw, JPRCH);
1550         adapter->stats.gorcl += IXGB_READ_REG(&adapter->hw, GORCL);
1551         adapter->stats.gorch += IXGB_READ_REG(&adapter->hw, GORCH);
1552         adapter->stats.torl += IXGB_READ_REG(&adapter->hw, TORL);
1553         adapter->stats.torh += IXGB_READ_REG(&adapter->hw, TORH);
1554         adapter->stats.rnbc += IXGB_READ_REG(&adapter->hw, RNBC);
1555         adapter->stats.ruc += IXGB_READ_REG(&adapter->hw, RUC);
1556         adapter->stats.roc += IXGB_READ_REG(&adapter->hw, ROC);
1557         adapter->stats.rlec += IXGB_READ_REG(&adapter->hw, RLEC);
1558         adapter->stats.crcerrs += IXGB_READ_REG(&adapter->hw, CRCERRS);
1559         adapter->stats.icbc += IXGB_READ_REG(&adapter->hw, ICBC);
1560         adapter->stats.ecbc += IXGB_READ_REG(&adapter->hw, ECBC);
1561         adapter->stats.mpc += IXGB_READ_REG(&adapter->hw, MPC);
1562         adapter->stats.tptl += IXGB_READ_REG(&adapter->hw, TPTL);
1563         adapter->stats.tpth += IXGB_READ_REG(&adapter->hw, TPTH);
1564         adapter->stats.gptcl += IXGB_READ_REG(&adapter->hw, GPTCL);
1565         adapter->stats.gptch += IXGB_READ_REG(&adapter->hw, GPTCH);
1566         adapter->stats.bptcl += IXGB_READ_REG(&adapter->hw, BPTCL);
1567         adapter->stats.bptch += IXGB_READ_REG(&adapter->hw, BPTCH);
1568         adapter->stats.mptcl += IXGB_READ_REG(&adapter->hw, MPTCL);
1569         adapter->stats.mptch += IXGB_READ_REG(&adapter->hw, MPTCH);
1570         adapter->stats.uptcl += IXGB_READ_REG(&adapter->hw, UPTCL);
1571         adapter->stats.uptch += IXGB_READ_REG(&adapter->hw, UPTCH);
1572         adapter->stats.vptcl += IXGB_READ_REG(&adapter->hw, VPTCL);
1573         adapter->stats.vptch += IXGB_READ_REG(&adapter->hw, VPTCH);
1574         adapter->stats.jptcl += IXGB_READ_REG(&adapter->hw, JPTCL);
1575         adapter->stats.jptch += IXGB_READ_REG(&adapter->hw, JPTCH);
1576         adapter->stats.gotcl += IXGB_READ_REG(&adapter->hw, GOTCL);
1577         adapter->stats.gotch += IXGB_READ_REG(&adapter->hw, GOTCH);
1578         adapter->stats.totl += IXGB_READ_REG(&adapter->hw, TOTL);
1579         adapter->stats.toth += IXGB_READ_REG(&adapter->hw, TOTH);
1580         adapter->stats.dc += IXGB_READ_REG(&adapter->hw, DC);
1581         adapter->stats.plt64c += IXGB_READ_REG(&adapter->hw, PLT64C);
1582         adapter->stats.tsctc += IXGB_READ_REG(&adapter->hw, TSCTC);
1583         adapter->stats.tsctfc += IXGB_READ_REG(&adapter->hw, TSCTFC);
1584         adapter->stats.ibic += IXGB_READ_REG(&adapter->hw, IBIC);
1585         adapter->stats.rfc += IXGB_READ_REG(&adapter->hw, RFC);
1586         adapter->stats.lfc += IXGB_READ_REG(&adapter->hw, LFC);
1587         adapter->stats.pfrc += IXGB_READ_REG(&adapter->hw, PFRC);
1588         adapter->stats.pftc += IXGB_READ_REG(&adapter->hw, PFTC);
1589         adapter->stats.mcfrc += IXGB_READ_REG(&adapter->hw, MCFRC);
1590         adapter->stats.mcftc += IXGB_READ_REG(&adapter->hw, MCFTC);
1591         adapter->stats.xonrxc += IXGB_READ_REG(&adapter->hw, XONRXC);
1592         adapter->stats.xontxc += IXGB_READ_REG(&adapter->hw, XONTXC);
1593         adapter->stats.xoffrxc += IXGB_READ_REG(&adapter->hw, XOFFRXC);
1594         adapter->stats.xofftxc += IXGB_READ_REG(&adapter->hw, XOFFTXC);
1595         adapter->stats.rjc += IXGB_READ_REG(&adapter->hw, RJC);
1596
1597         /* Fill out the OS statistics structure */
1598
1599         adapter->net_stats.rx_packets = adapter->stats.gprcl;
1600         adapter->net_stats.tx_packets = adapter->stats.gptcl;
1601         adapter->net_stats.rx_bytes = adapter->stats.gorcl;
1602         adapter->net_stats.tx_bytes = adapter->stats.gotcl;
1603         adapter->net_stats.multicast = adapter->stats.mprcl;
1604         adapter->net_stats.collisions = 0;
1605
1606         /* ignore RLEC as it reports errors for padded (<64bytes) frames
1607          * with a length in the type/len field */
1608         adapter->net_stats.rx_errors =
1609             /* adapter->stats.rnbc + */ adapter->stats.crcerrs +
1610             adapter->stats.ruc +
1611             adapter->stats.roc /*+ adapter->stats.rlec */  +
1612             adapter->stats.icbc +
1613             adapter->stats.ecbc + adapter->stats.mpc;
1614
1615         adapter->net_stats.rx_dropped = adapter->stats.mpc;
1616
1617         /* see above
1618          * adapter->net_stats.rx_length_errors = adapter->stats.rlec;
1619          */
1620
1621         adapter->net_stats.rx_crc_errors = adapter->stats.crcerrs;
1622         adapter->net_stats.rx_fifo_errors = adapter->stats.mpc;
1623         adapter->net_stats.rx_missed_errors = adapter->stats.mpc;
1624         adapter->net_stats.rx_over_errors = adapter->stats.mpc;
1625
1626         adapter->net_stats.tx_errors = 0;
1627         adapter->net_stats.rx_frame_errors = 0;
1628         adapter->net_stats.tx_aborted_errors = 0;
1629         adapter->net_stats.tx_carrier_errors = 0;
1630         adapter->net_stats.tx_fifo_errors = 0;
1631         adapter->net_stats.tx_heartbeat_errors = 0;
1632         adapter->net_stats.tx_window_errors = 0;
1633 }
1634
1635 #define IXGB_MAX_INTR 10
1636 /**
1637  * ixgb_intr - Interrupt Handler
1638  * @irq: interrupt number
1639  * @data: pointer to a network interface device structure
1640  * @pt_regs: CPU registers structure
1641  **/
1642
1643 static irqreturn_t
1644 ixgb_intr(int irq, void *data, struct pt_regs *regs)
1645 {
1646         struct net_device *netdev = data;
1647         struct ixgb_adapter *adapter = netdev_priv(netdev);
1648         struct ixgb_hw *hw = &adapter->hw;
1649         uint32_t icr = IXGB_READ_REG(hw, ICR);
1650 #ifndef CONFIG_IXGB_NAPI
1651         unsigned int i;
1652 #endif
1653
1654         if(unlikely(!icr))
1655                 return IRQ_NONE;  /* Not our interrupt */
1656
1657         if(unlikely(icr & (IXGB_INT_RXSEQ | IXGB_INT_LSC))) {
1658                 mod_timer(&adapter->watchdog_timer, jiffies);
1659         }
1660
1661 #ifdef CONFIG_IXGB_NAPI
1662         if(netif_rx_schedule_prep(netdev)) {
1663
1664                 /* Disable interrupts and register for poll. The flush
1665                   of the posted write is intentionally left out.
1666                 */
1667
1668                 atomic_inc(&adapter->irq_sem);
1669                 IXGB_WRITE_REG(&adapter->hw, IMC, ~0);
1670                 __netif_rx_schedule(netdev);
1671         }
1672 #else
1673         /* yes, that is actually a & and it is meant to make sure that
1674          * every pass through this for loop checks both receive and
1675          * transmit queues for completed descriptors, intended to
1676          * avoid starvation issues and assist tx/rx fairness. */
1677         for(i = 0; i < IXGB_MAX_INTR; i++)
1678                 if(!ixgb_clean_rx_irq(adapter) &
1679                    !ixgb_clean_tx_irq(adapter))
1680                         break;
1681 #endif
1682         return IRQ_HANDLED;
1683 }
1684
1685 #ifdef CONFIG_IXGB_NAPI
1686 /**
1687  * ixgb_clean - NAPI Rx polling callback
1688  * @adapter: board private structure
1689  **/
1690
1691 static int
1692 ixgb_clean(struct net_device *netdev, int *budget)
1693 {
1694         struct ixgb_adapter *adapter = netdev_priv(netdev);
1695         int work_to_do = min(*budget, netdev->quota);
1696         int tx_cleaned;
1697         int work_done = 0;
1698
1699         tx_cleaned = ixgb_clean_tx_irq(adapter);
1700         ixgb_clean_rx_irq(adapter, &work_done, work_to_do);
1701
1702         *budget -= work_done;
1703         netdev->quota -= work_done;
1704
1705         /* if no Tx and not enough Rx work done, exit the polling mode */
1706         if((!tx_cleaned && (work_done == 0)) || !netif_running(netdev)) {
1707                 netif_rx_complete(netdev);
1708                 ixgb_irq_enable(adapter);
1709                 return 0;
1710         }
1711
1712         return 1;
1713 }
1714 #endif
1715
1716 /**
1717  * ixgb_clean_tx_irq - Reclaim resources after transmit completes
1718  * @adapter: board private structure
1719  **/
1720
1721 static boolean_t
1722 ixgb_clean_tx_irq(struct ixgb_adapter *adapter)
1723 {
1724         struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
1725         struct net_device *netdev = adapter->netdev;
1726         struct ixgb_tx_desc *tx_desc, *eop_desc;
1727         struct ixgb_buffer *buffer_info;
1728         unsigned int i, eop;
1729         boolean_t cleaned = FALSE;
1730
1731         i = tx_ring->next_to_clean;
1732         eop = tx_ring->buffer_info[i].next_to_watch;
1733         eop_desc = IXGB_TX_DESC(*tx_ring, eop);
1734
1735         while(eop_desc->status & IXGB_TX_DESC_STATUS_DD) {
1736
1737                 for(cleaned = FALSE; !cleaned; ) {
1738                         tx_desc = IXGB_TX_DESC(*tx_ring, i);
1739                         buffer_info = &tx_ring->buffer_info[i];
1740
1741                         if (tx_desc->popts
1742                             & (IXGB_TX_DESC_POPTS_TXSM |
1743                                IXGB_TX_DESC_POPTS_IXSM))
1744                                 adapter->hw_csum_tx_good++;
1745
1746                         ixgb_unmap_and_free_tx_resource(adapter, buffer_info);
1747
1748                         *(uint32_t *)&(tx_desc->status) = 0;
1749
1750                         cleaned = (i == eop);
1751                         if(++i == tx_ring->count) i = 0;
1752                 }
1753
1754                 eop = tx_ring->buffer_info[i].next_to_watch;
1755                 eop_desc = IXGB_TX_DESC(*tx_ring, eop);
1756         }
1757
1758         tx_ring->next_to_clean = i;
1759
1760         spin_lock(&adapter->tx_lock);
1761         if(cleaned && netif_queue_stopped(netdev) && netif_carrier_ok(netdev) &&
1762            (IXGB_DESC_UNUSED(tx_ring) > IXGB_TX_QUEUE_WAKE)) {
1763
1764                 netif_wake_queue(netdev);
1765         }
1766         spin_unlock(&adapter->tx_lock);
1767
1768         if(adapter->detect_tx_hung) {
1769                 /* detect a transmit hang in hardware, this serializes the
1770                  * check with the clearing of time_stamp and movement of i */
1771                 adapter->detect_tx_hung = FALSE;
1772                 if(tx_ring->buffer_info[i].dma &&
1773                    time_after(jiffies, tx_ring->buffer_info[i].time_stamp + HZ)
1774                    && !(IXGB_READ_REG(&adapter->hw, STATUS) &
1775                         IXGB_STATUS_TXOFF))
1776                         netif_stop_queue(netdev);
1777         }
1778
1779         return cleaned;
1780 }
1781
1782 /**
1783  * ixgb_rx_checksum - Receive Checksum Offload for 82597.
1784  * @adapter: board private structure
1785  * @rx_desc: receive descriptor
1786  * @sk_buff: socket buffer with received data
1787  **/
1788
1789 static inline void
1790 ixgb_rx_checksum(struct ixgb_adapter *adapter,
1791                  struct ixgb_rx_desc *rx_desc,
1792                  struct sk_buff *skb)
1793 {
1794         /* Ignore Checksum bit is set OR
1795          * TCP Checksum has not been calculated
1796          */
1797         if((rx_desc->status & IXGB_RX_DESC_STATUS_IXSM) ||
1798            (!(rx_desc->status & IXGB_RX_DESC_STATUS_TCPCS))) {
1799                 skb->ip_summed = CHECKSUM_NONE;
1800                 return;
1801         }
1802
1803         /* At this point we know the hardware did the TCP checksum */
1804         /* now look at the TCP checksum error bit */
1805         if(rx_desc->errors & IXGB_RX_DESC_ERRORS_TCPE) {
1806                 /* let the stack verify checksum errors */
1807                 skb->ip_summed = CHECKSUM_NONE;
1808                 adapter->hw_csum_rx_error++;
1809         } else {
1810                 /* TCP checksum is good */
1811                 skb->ip_summed = CHECKSUM_UNNECESSARY;
1812                 adapter->hw_csum_rx_good++;
1813         }
1814 }
1815
1816 /**
1817  * ixgb_clean_rx_irq - Send received data up the network stack,
1818  * @adapter: board private structure
1819  **/
1820
1821 static boolean_t
1822 #ifdef CONFIG_IXGB_NAPI
1823 ixgb_clean_rx_irq(struct ixgb_adapter *adapter, int *work_done, int work_to_do)
1824 #else
1825 ixgb_clean_rx_irq(struct ixgb_adapter *adapter)
1826 #endif
1827 {
1828         struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
1829         struct net_device *netdev = adapter->netdev;
1830         struct pci_dev *pdev = adapter->pdev;
1831         struct ixgb_rx_desc *rx_desc, *next_rxd;
1832         struct ixgb_buffer *buffer_info, *next_buffer, *next2_buffer;
1833         uint32_t length;
1834         unsigned int i, j;
1835         boolean_t cleaned = FALSE;
1836
1837         i = rx_ring->next_to_clean;
1838         rx_desc = IXGB_RX_DESC(*rx_ring, i);
1839         buffer_info = &rx_ring->buffer_info[i];
1840
1841         while(rx_desc->status & IXGB_RX_DESC_STATUS_DD) {
1842                 struct sk_buff *skb, *next_skb;
1843                 u8 status;
1844
1845 #ifdef CONFIG_IXGB_NAPI
1846                 if(*work_done >= work_to_do)
1847                         break;
1848
1849                 (*work_done)++;
1850 #endif
1851                 status = rx_desc->status;
1852                 skb = buffer_info->skb;
1853
1854                 prefetch(skb->data);
1855
1856                 if(++i == rx_ring->count) i = 0;
1857                 next_rxd = IXGB_RX_DESC(*rx_ring, i);
1858                 prefetch(next_rxd);
1859
1860                 if((j = i + 1) == rx_ring->count) j = 0;
1861                 next2_buffer = &rx_ring->buffer_info[j];
1862                 prefetch(next2_buffer);
1863
1864                 next_buffer = &rx_ring->buffer_info[i];
1865                 next_skb = next_buffer->skb;
1866                 prefetch(next_skb);
1867
1868                 cleaned = TRUE;
1869
1870                 pci_unmap_single(pdev,
1871                                  buffer_info->dma,
1872                                  buffer_info->length,
1873                                  PCI_DMA_FROMDEVICE);
1874
1875                 length = le16_to_cpu(rx_desc->length);
1876
1877                 if(unlikely(!(status & IXGB_RX_DESC_STATUS_EOP))) {
1878
1879                         /* All receives must fit into a single buffer */
1880
1881                         IXGB_DBG("Receive packet consumed multiple buffers "
1882                                          "length<%x>\n", length);
1883
1884                         dev_kfree_skb_irq(skb);
1885                         goto rxdesc_done;
1886                 }
1887
1888                 if (unlikely(rx_desc->errors
1889                              & (IXGB_RX_DESC_ERRORS_CE | IXGB_RX_DESC_ERRORS_SE
1890                                 | IXGB_RX_DESC_ERRORS_P |
1891                                 IXGB_RX_DESC_ERRORS_RXE))) {
1892
1893                         dev_kfree_skb_irq(skb);
1894                         goto rxdesc_done;
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 && (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 && (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 rxdesc_done:
1924                 /* clean up descriptor, might be written over by hw */
1925                 rx_desc->status = 0;
1926                 buffer_info->skb = NULL;
1927
1928                 /* use prefetched values */
1929                 rx_desc = next_rxd;
1930                 buffer_info = next_buffer;
1931         }
1932
1933         rx_ring->next_to_clean = i;
1934
1935         ixgb_alloc_rx_buffers(adapter);
1936
1937         return cleaned;
1938 }
1939
1940 /**
1941  * ixgb_alloc_rx_buffers - Replace used receive buffers
1942  * @adapter: address of board private structure
1943  **/
1944
1945 static void
1946 ixgb_alloc_rx_buffers(struct ixgb_adapter *adapter)
1947 {
1948         struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
1949         struct net_device *netdev = adapter->netdev;
1950         struct pci_dev *pdev = adapter->pdev;
1951         struct ixgb_rx_desc *rx_desc;
1952         struct ixgb_buffer *buffer_info;
1953         struct sk_buff *skb;
1954         unsigned int i;
1955         int num_group_tail_writes;
1956         long cleancount;
1957
1958         i = rx_ring->next_to_use;
1959         buffer_info = &rx_ring->buffer_info[i];
1960         cleancount = IXGB_DESC_UNUSED(rx_ring);
1961
1962         num_group_tail_writes = IXGB_RX_BUFFER_WRITE;
1963
1964         /* leave three descriptors unused */
1965         while(--cleancount > 2) {
1966                 rx_desc = IXGB_RX_DESC(*rx_ring, i);
1967
1968                 skb = dev_alloc_skb(adapter->rx_buffer_len + NET_IP_ALIGN);
1969
1970                 if(unlikely(!skb)) {
1971                         /* Better luck next round */
1972                         break;
1973                 }
1974
1975                 /* Make buffer alignment 2 beyond a 16 byte boundary
1976                  * this will result in a 16 byte aligned IP header after
1977                  * the 14 byte MAC header is removed
1978                  */
1979                 skb_reserve(skb, NET_IP_ALIGN);
1980
1981                 skb->dev = netdev;
1982
1983                 buffer_info->skb = skb;
1984                 buffer_info->length = adapter->rx_buffer_len;
1985                 buffer_info->dma =
1986                         pci_map_single(pdev,
1987                                    skb->data,
1988                                    adapter->rx_buffer_len,
1989                                    PCI_DMA_FROMDEVICE);
1990
1991                 rx_desc->buff_addr = cpu_to_le64(buffer_info->dma);
1992                 /* guarantee DD bit not set now before h/w gets descriptor
1993                  * this is the rest of the workaround for h/w double
1994                  * writeback. */
1995                 rx_desc->status = 0;
1996
1997                 if((i & ~(num_group_tail_writes- 1)) == i) {
1998                         /* Force memory writes to complete before letting h/w
1999                          * know there are new descriptors to fetch.  (Only
2000                          * applicable for weak-ordered memory model archs,
2001                          * such as IA-64). */
2002                         wmb();
2003
2004                         IXGB_WRITE_REG(&adapter->hw, RDT, i);
2005                 }
2006
2007                 if(++i == rx_ring->count) i = 0;
2008                 buffer_info = &rx_ring->buffer_info[i];
2009         }
2010
2011         rx_ring->next_to_use = i;
2012 }
2013
2014 /**
2015  * ixgb_vlan_rx_register - enables or disables vlan tagging/stripping.
2016  *
2017  * @param netdev network interface device structure
2018  * @param grp indicates to enable or disable tagging/stripping
2019  **/
2020 static void
2021 ixgb_vlan_rx_register(struct net_device *netdev, struct vlan_group *grp)
2022 {
2023         struct ixgb_adapter *adapter = netdev_priv(netdev);
2024         uint32_t ctrl, rctl;
2025
2026         ixgb_irq_disable(adapter);
2027         adapter->vlgrp = grp;
2028
2029         if(grp) {
2030                 /* enable VLAN tag insert/strip */
2031                 ctrl = IXGB_READ_REG(&adapter->hw, CTRL0);
2032                 ctrl |= IXGB_CTRL0_VME;
2033                 IXGB_WRITE_REG(&adapter->hw, CTRL0, ctrl);
2034
2035                 /* enable VLAN receive filtering */
2036
2037                 rctl = IXGB_READ_REG(&adapter->hw, RCTL);
2038                 rctl |= IXGB_RCTL_VFE;
2039                 rctl &= ~IXGB_RCTL_CFIEN;
2040                 IXGB_WRITE_REG(&adapter->hw, RCTL, rctl);
2041         } else {
2042                 /* disable VLAN tag insert/strip */
2043
2044                 ctrl = IXGB_READ_REG(&adapter->hw, CTRL0);
2045                 ctrl &= ~IXGB_CTRL0_VME;
2046                 IXGB_WRITE_REG(&adapter->hw, CTRL0, ctrl);
2047
2048                 /* disable VLAN filtering */
2049
2050                 rctl = IXGB_READ_REG(&adapter->hw, RCTL);
2051                 rctl &= ~IXGB_RCTL_VFE;
2052                 IXGB_WRITE_REG(&adapter->hw, RCTL, rctl);
2053         }
2054
2055         ixgb_irq_enable(adapter);
2056 }
2057
2058 static void
2059 ixgb_vlan_rx_add_vid(struct net_device *netdev, uint16_t vid)
2060 {
2061         struct ixgb_adapter *adapter = netdev_priv(netdev);
2062         uint32_t vfta, index;
2063
2064         /* add VID to filter table */
2065
2066         index = (vid >> 5) & 0x7F;
2067         vfta = IXGB_READ_REG_ARRAY(&adapter->hw, VFTA, index);
2068         vfta |= (1 << (vid & 0x1F));
2069         ixgb_write_vfta(&adapter->hw, index, vfta);
2070 }
2071
2072 static void
2073 ixgb_vlan_rx_kill_vid(struct net_device *netdev, uint16_t vid)
2074 {
2075         struct ixgb_adapter *adapter = netdev_priv(netdev);
2076         uint32_t vfta, index;
2077
2078         ixgb_irq_disable(adapter);
2079
2080         if(adapter->vlgrp)
2081                 adapter->vlgrp->vlan_devices[vid] = NULL;
2082
2083         ixgb_irq_enable(adapter);
2084
2085         /* remove VID from filter table*/
2086
2087         index = (vid >> 5) & 0x7F;
2088         vfta = IXGB_READ_REG_ARRAY(&adapter->hw, VFTA, index);
2089         vfta &= ~(1 << (vid & 0x1F));
2090         ixgb_write_vfta(&adapter->hw, index, vfta);
2091 }
2092
2093 static void
2094 ixgb_restore_vlan(struct ixgb_adapter *adapter)
2095 {
2096         ixgb_vlan_rx_register(adapter->netdev, adapter->vlgrp);
2097
2098         if(adapter->vlgrp) {
2099                 uint16_t vid;
2100                 for(vid = 0; vid < VLAN_GROUP_ARRAY_LEN; vid++) {
2101                         if(!adapter->vlgrp->vlan_devices[vid])
2102                                 continue;
2103                         ixgb_vlan_rx_add_vid(adapter->netdev, vid);
2104                 }
2105         }
2106 }
2107
2108 #ifdef CONFIG_NET_POLL_CONTROLLER
2109 /*
2110  * Polling 'interrupt' - used by things like netconsole to send skbs
2111  * without having to re-enable interrupts. It's not called while
2112  * the interrupt routine is executing.
2113  */
2114
2115 static void ixgb_netpoll(struct net_device *dev)
2116 {
2117         struct ixgb_adapter *adapter = dev->priv;
2118
2119         disable_irq(adapter->pdev->irq);
2120         ixgb_intr(adapter->pdev->irq, dev, NULL);
2121         enable_irq(adapter->pdev->irq);
2122 }
2123 #endif
2124
2125 /* ixgb_main.c */