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 static int ixgb_notify_reboot(struct notifier_block *, unsigned long event,
 124                               void *ptr);
 125 static int ixgb_suspend(struct pci_dev *pdev, uint32_t state);
 126
 127 #ifdef CONFIG_NET_POLL_CONTROLLER
 128 /* for netdump / net console */
 129 static void ixgb_netpoll(struct net_device *dev);
 130 #endif
 131
 132 struct notifier_block ixgb_notifier_reboot = {
 133         .notifier_call = ixgb_notify_reboot,
 134         .next = NULL,
 135         .priority = 0
 136 };
 137
 138 /* Exported from other modules */
 139
 140 extern void ixgb_check_options(struct ixgb_adapter *adapter);
 141
 142 static struct pci_driver ixgb_driver = {
 143         .name = ixgb_driver_name,
 144         .id_table = ixgb_pci_tbl,
 145         .probe = ixgb_probe,
 146         .remove = __devexit_p(ixgb_remove),
 147         /* Power Managment Hooks */
 148         .suspend = NULL,
 149         .resume = NULL
 150 };
 151
 152 MODULE_AUTHOR("Intel Corporation, <linux.nics@intel.com>");
 153 MODULE_DESCRIPTION("Intel(R) PRO/10GbE Network Driver");
 154 MODULE_LICENSE("GPL");
 155
 156 /* some defines for controlling descriptor fetches in h/w */
 157 #define RXDCTL_PTHRESH_DEFAULT 128      /* chip considers prefech below this */
 158 #define RXDCTL_HTHRESH_DEFAULT 16       /* chip will only prefetch if tail is
 159                                            pushed this many descriptors from head */
 160 #define RXDCTL_WTHRESH_DEFAULT 16       /* chip writes back at this many or RXT0 */
 161
 162 /**
 163  * ixgb_init_module - Driver Registration Routine
 164  *
 165  * ixgb_init_module is the first routine called when the driver is
 166  * loaded. All it does is register with the PCI subsystem.
 167  **/
 168
 169 static int __init
 170 ixgb_init_module(void)
 171 {
 172         int ret;
 173         printk(KERN_INFO "%s - version %s\n",
 174                ixgb_driver_string, ixgb_driver_version);
 175
 176         printk(KERN_INFO "%s\n", ixgb_copyright);
 177
 178         ret = pci_module_init(&ixgb_driver);
 179         if(ret >= 0) {
 180                 register_reboot_notifier(&ixgb_notifier_reboot);
 181         }
 182         return ret;
 183 }
 184
 185 module_init(ixgb_init_module);
 186
 187 /**
 188  * ixgb_exit_module - Driver Exit Cleanup Routine
 189  *
 190  * ixgb_exit_module is called just before the driver is removed
 191  * from memory.
 192  **/
 193
 194 static void __exit
 195 ixgb_exit_module(void)
 196 {
 197         unregister_reboot_notifier(&ixgb_notifier_reboot);
 198         pci_unregister_driver(&ixgb_driver);
 199 }
 200
 201 module_exit(ixgb_exit_module);
 202
 203 /**
 204  * ixgb_irq_disable - Mask off interrupt generation on the NIC
 205  * @adapter: board private structure
 206  **/
 207
 208 static inline void
 209 ixgb_irq_disable(struct ixgb_adapter *adapter)
 210 {
 211         atomic_inc(&adapter->irq_sem);
 212         IXGB_WRITE_REG(&adapter->hw, IMC, ~0);
 213         IXGB_WRITE_FLUSH(&adapter->hw);
 214         synchronize_irq(adapter->pdev->irq);
 215 }
 216
 217 /**
 218  * ixgb_irq_enable - Enable default interrupt generation settings
 219  * @adapter: board private structure
 220  **/
 221
 222 static inline void
 223 ixgb_irq_enable(struct ixgb_adapter *adapter)
 224 {
 225         if(atomic_dec_and_test(&adapter->irq_sem)) {
 226                 IXGB_WRITE_REG(&adapter->hw, IMS,
 227                            IXGB_INT_RXT0 | IXGB_INT_RXDMT0 | IXGB_INT_TXDW |
 228                            IXGB_INT_RXO | IXGB_INT_LSC);
 229                 IXGB_WRITE_FLUSH(&adapter->hw);
 230         }
 231 }
 232
 233 int
 234 ixgb_up(struct ixgb_adapter *adapter)
 235 {
 236         struct net_device *netdev = adapter->netdev;
 237         int err;
 238         int max_frame = netdev->mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;
 239         struct ixgb_hw *hw = &adapter->hw;
 240
 241         /* hardware has been reset, we need to reload some things */
 242
 243         ixgb_set_multi(netdev);
 244
 245         ixgb_restore_vlan(adapter);
 246
 247         ixgb_configure_tx(adapter);
 248         ixgb_setup_rctl(adapter);
 249         ixgb_configure_rx(adapter);
 250         ixgb_alloc_rx_buffers(adapter);
 251
 252 #ifdef CONFIG_PCI_MSI
 253         {
 254         boolean_t pcix = (IXGB_READ_REG(&adapter->hw, STATUS) &
 255                                                   IXGB_STATUS_PCIX_MODE) ? TRUE : FALSE;
 256         adapter->have_msi = TRUE;
 257
 258         if (!pcix)
 259            adapter->have_msi = FALSE;
 260         else if((err = pci_enable_msi(adapter->pdev))) {
 261                 printk (KERN_ERR
 262                  "Unable to allocate MSI interrupt Error: %d\n", err);
 263                 adapter->have_msi = FALSE;
 264                 /* proceed to try to request regular interrupt */
 265         }
 266         }
 267
 268 #endif
 269         if((err = request_irq(adapter->pdev->irq, &ixgb_intr,
 270                                   SA_SHIRQ | SA_SAMPLE_RANDOM,
 271                                   netdev->name, netdev)))
 272                 return err;
 273
 274         /* disable interrupts and get the hardware into a known state */
 275         IXGB_WRITE_REG(&adapter->hw, IMC, 0xffffffff);
 276
 277         if((hw->max_frame_size != max_frame) ||
 278                 (hw->max_frame_size !=
 279                 (IXGB_READ_REG(hw, MFS) >> IXGB_MFS_SHIFT))) {
 280
 281                 hw->max_frame_size = max_frame;
 282
 283                 IXGB_WRITE_REG(hw, MFS, hw->max_frame_size << IXGB_MFS_SHIFT);
 284
 285                 if(hw->max_frame_size >
 286                    IXGB_MAX_ENET_FRAME_SIZE_WITHOUT_FCS + ENET_FCS_LENGTH) {
 287                         uint32_t ctrl0 = IXGB_READ_REG(hw, CTRL0);
 288
 289                         if(!(ctrl0 & IXGB_CTRL0_JFE)) {
 290                                 ctrl0 |= IXGB_CTRL0_JFE;
 291                                 IXGB_WRITE_REG(hw, CTRL0, ctrl0);
 292                         }
 293                 }
 294         }
 295
 296         mod_timer(&adapter->watchdog_timer, jiffies);
 297         ixgb_irq_enable(adapter);
 298
 299 #ifdef CONFIG_IXGB_NAPI
 300         netif_poll_enable(netdev);
 301 #endif
 302         return 0;
 303 }
 304
 305 void
 306 ixgb_down(struct ixgb_adapter *adapter, boolean_t kill_watchdog)
 307 {
 308         struct net_device *netdev = adapter->netdev;
 309
 310         ixgb_irq_disable(adapter);
 311         free_irq(adapter->pdev->irq, netdev);
 312 #ifdef CONFIG_PCI_MSI
 313         if(adapter->have_msi == TRUE)
 314                 pci_disable_msi(adapter->pdev);
 315
 316 #endif
 317         if(kill_watchdog)
 318                 del_timer_sync(&adapter->watchdog_timer);
 319 #ifdef CONFIG_IXGB_NAPI
 320         netif_poll_disable(netdev);
 321 #endif
 322         adapter->link_speed = 0;
 323         adapter->link_duplex = 0;
 324         netif_carrier_off(netdev);
 325         netif_stop_queue(netdev);
 326
 327         ixgb_reset(adapter);
 328         ixgb_clean_tx_ring(adapter);
 329         ixgb_clean_rx_ring(adapter);
 330 }
 331
 332 void
 333 ixgb_reset(struct ixgb_adapter *adapter)
 334 {
 335
 336         ixgb_adapter_stop(&adapter->hw);
 337         if(!ixgb_init_hw(&adapter->hw))
 338                 IXGB_DBG("ixgb_init_hw failed.\n");
 339 }
 340
 341 /**
 342  * ixgb_probe - Device Initialization Routine
 343  * @pdev: PCI device information struct
 344  * @ent: entry in ixgb_pci_tbl
 345  *
 346  * Returns 0 on success, negative on failure
 347  *
 348  * ixgb_probe initializes an adapter identified by a pci_dev structure.
 349  * The OS initialization, configuring of the adapter private structure,
 350  * and a hardware reset occur.
 351  **/
 352
 353 static int __devinit
 354 ixgb_probe(struct pci_dev *pdev,
 355                 const struct pci_device_id *ent)
 356 {
 357         struct net_device *netdev = NULL;
 358         struct ixgb_adapter *adapter;
 359         static int cards_found = 0;
 360         unsigned long mmio_start;
 361         int mmio_len;
 362         int pci_using_dac;
 363         int i;
 364         int err;
 365
 366         if((err = pci_enable_device(pdev)))
 367                 return err;
 368
 369         if(!(err = pci_set_dma_mask(pdev, DMA_64BIT_MASK))) {
 370                 pci_using_dac = 1;
 371         } else {
 372                 if((err = pci_set_dma_mask(pdev, DMA_32BIT_MASK))) {
 373                         IXGB_ERR("No usable DMA configuration, aborting\n");
 374                         return err;
 375                 }
 376                 pci_using_dac = 0;
 377         }
 378
 379         if((err = pci_request_regions(pdev, ixgb_driver_name)))
 380                 return err;
 381
 382         pci_set_master(pdev);
 383
 384         netdev = alloc_etherdev(sizeof(struct ixgb_adapter));
 385         if(!netdev) {
 386                 err = -ENOMEM;
 387                 goto err_alloc_etherdev;
 388         }
 389
 390         SET_MODULE_OWNER(netdev);
 391         SET_NETDEV_DEV(netdev, &pdev->dev);
 392
 393         pci_set_drvdata(pdev, netdev);
 394         adapter = netdev->priv;
 395         adapter->netdev = netdev;
 396         adapter->pdev = pdev;
 397         adapter->hw.back = adapter;
 398
 399         mmio_start = pci_resource_start(pdev, BAR_0);
 400         mmio_len = pci_resource_len(pdev, BAR_0);
 401
 402         adapter->hw.hw_addr = ioremap(mmio_start, mmio_len);
 403         if(!adapter->hw.hw_addr) {
 404                 err = -EIO;
 405                 goto err_ioremap;
 406         }
 407
 408         for(i = BAR_1; i <= BAR_5; i++) {
 409                 if(pci_resource_len(pdev, i) == 0)
 410                         continue;
 411                 if(pci_resource_flags(pdev, i) & IORESOURCE_IO) {
 412                         adapter->hw.io_base = pci_resource_start(pdev, i);
 413                         break;
 414                 }
 415         }
 416
 417         netdev->open = &ixgb_open;
 418         netdev->stop = &ixgb_close;
 419         netdev->hard_start_xmit = &ixgb_xmit_frame;
 420         netdev->get_stats = &ixgb_get_stats;
 421         netdev->set_multicast_list = &ixgb_set_multi;
 422         netdev->set_mac_address = &ixgb_set_mac;
 423         netdev->change_mtu = &ixgb_change_mtu;
 424         ixgb_set_ethtool_ops(netdev);
 425         netdev->tx_timeout = &ixgb_tx_timeout;
 426         netdev->watchdog_timeo = HZ;
 427 #ifdef CONFIG_IXGB_NAPI
 428         netdev->poll = &ixgb_clean;
 429         netdev->weight = 64;
 430 #endif
 431         netdev->vlan_rx_register = ixgb_vlan_rx_register;
 432         netdev->vlan_rx_add_vid = ixgb_vlan_rx_add_vid;
 433         netdev->vlan_rx_kill_vid = ixgb_vlan_rx_kill_vid;
 434 #ifdef CONFIG_NET_POLL_CONTROLLER
 435         netdev->poll_controller = ixgb_netpoll;
 436 #endif
 437
 438         netdev->mem_start = mmio_start;
 439         netdev->mem_end = mmio_start + mmio_len;
 440         netdev->base_addr = adapter->hw.io_base;
 441
 442         adapter->bd_number = cards_found;
 443         adapter->link_speed = 0;
 444         adapter->link_duplex = 0;
 445
 446         /* setup the private structure */
 447
 448         if((err = ixgb_sw_init(adapter)))
 449                 goto err_sw_init;
 450
 451         netdev->features = NETIF_F_SG |
 452                            NETIF_F_HW_CSUM |
 453                            NETIF_F_HW_VLAN_TX |
 454                            NETIF_F_HW_VLAN_RX |
 455                            NETIF_F_HW_VLAN_FILTER;
 456 #ifdef NETIF_F_TSO
 457         netdev->features |= NETIF_F_TSO;
 458 #endif
 459
 460         if(pci_using_dac)
 461                 netdev->features |= NETIF_F_HIGHDMA;
 462
 463         /* make sure the EEPROM is good */
 464
 465         if(!ixgb_validate_eeprom_checksum(&adapter->hw)) {
 466                 printk(KERN_ERR "The EEPROM Checksum Is Not Valid\n");
 467                 err = -EIO;
 468                 goto err_eeprom;
 469         }
 470
 471         ixgb_get_ee_mac_addr(&adapter->hw, netdev->dev_addr);
 472
 473         if(!is_valid_ether_addr(netdev->dev_addr)) {
 474                 err = -EIO;
 475                 goto err_eeprom;
 476         }
 477
 478         adapter->part_num = ixgb_get_ee_pba_number(&adapter->hw);
 479
 480         init_timer(&adapter->watchdog_timer);
 481         adapter->watchdog_timer.function = &ixgb_watchdog;
 482         adapter->watchdog_timer.data = (unsigned long)adapter;
 483
 484         INIT_WORK(&adapter->tx_timeout_task,
 485                   (void (*)(void *))ixgb_tx_timeout_task, netdev);
 486
 487         if((err = register_netdev(netdev)))
 488                 goto err_register;
 489
 490         /* we're going to reset, so assume we have no link for now */
 491
 492         netif_carrier_off(netdev);
 493         netif_stop_queue(netdev);
 494
 495         printk(KERN_INFO "%s: Intel(R) PRO/10GbE Network Connection\n",
 496                    netdev->name);
 497         ixgb_check_options(adapter);
 498         /* reset the hardware with the new settings */
 499
 500         ixgb_reset(adapter);
 501
 502         cards_found++;
 503         return 0;
 504
 505 err_register:
 506 err_sw_init:
 507 err_eeprom:
 508         iounmap(adapter->hw.hw_addr);
 509 err_ioremap:
 510         free_netdev(netdev);
 511 err_alloc_etherdev:
 512         pci_release_regions(pdev);
 513         return err;
 514 }
 515
 516 /**
 517  * ixgb_remove - Device Removal Routine
 518  * @pdev: PCI device information struct
 519  *
 520  * ixgb_remove is called by the PCI subsystem to alert the driver
 521  * that it should release a PCI device.  The could be caused by a
 522  * Hot-Plug event, or because the driver is going to be removed from
 523  * memory.
 524  **/
 525
 526 static void __devexit
 527 ixgb_remove(struct pci_dev *pdev)
 528 {
 529         struct net_device *netdev = pci_get_drvdata(pdev);
 530         struct ixgb_adapter *adapter = netdev->priv;
 531
 532         unregister_netdev(netdev);
 533
 534         iounmap(adapter->hw.hw_addr);
 535         pci_release_regions(pdev);
 536
 537         free_netdev(netdev);
 538 }
 539
 540 /**
 541  * ixgb_sw_init - Initialize general software structures (struct ixgb_adapter)
 542  * @adapter: board private structure to initialize
 543  *
 544  * ixgb_sw_init initializes the Adapter private data structure.
 545  * Fields are initialized based on PCI device information and
 546  * OS network device settings (MTU size).
 547  **/
 548
 549 static int __devinit
 550 ixgb_sw_init(struct ixgb_adapter *adapter)
 551 {
 552         struct ixgb_hw *hw = &adapter->hw;
 553         struct net_device *netdev = adapter->netdev;
 554         struct pci_dev *pdev = adapter->pdev;
 555
 556         /* PCI config space info */
 557
 558         hw->vendor_id = pdev->vendor;
 559         hw->device_id = pdev->device;
 560         hw->subsystem_vendor_id = pdev->subsystem_vendor;
 561         hw->subsystem_id = pdev->subsystem_device;
 562
 563         adapter->rx_buffer_len = IXGB_RXBUFFER_2048;
 564
 565         hw->max_frame_size = netdev->mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;
 566
 567         if((hw->device_id == IXGB_DEVICE_ID_82597EX)
 568            ||(hw->device_id == IXGB_DEVICE_ID_82597EX_LR)
 569            ||(hw->device_id == IXGB_DEVICE_ID_82597EX_SR))
 570                         hw->mac_type = ixgb_82597;
 571         else {
 572                 /* should never have loaded on this device */
 573                 printk(KERN_ERR "ixgb: unsupported device id\n");
 574         }
 575
 576         /* enable flow control to be programmed */
 577         hw->fc.send_xon = 1;
 578
 579         atomic_set(&adapter->irq_sem, 1);
 580         spin_lock_init(&adapter->tx_lock);
 581
 582         return 0;
 583 }
 584
 585 /**
 586  * ixgb_open - Called when a network interface is made active
 587  * @netdev: network interface device structure
 588  *
 589  * Returns 0 on success, negative value on failure
 590  *
 591  * The open entry point is called when a network interface is made
 592  * active by the system (IFF_UP).  At this point all resources needed
 593  * for transmit and receive operations are allocated, the interrupt
 594  * handler is registered with the OS, the watchdog timer is started,
 595  * and the stack is notified that the interface is ready.
 596  **/
 597
 598 static int
 599 ixgb_open(struct net_device *netdev)
 600 {
 601         struct ixgb_adapter *adapter = netdev->priv;
 602         int err;
 603
 604         /* allocate transmit descriptors */
 605
 606         if((err = ixgb_setup_tx_resources(adapter)))
 607                 goto err_setup_tx;
 608
 609         /* allocate receive descriptors */
 610
 611         if((err = ixgb_setup_rx_resources(adapter)))
 612                 goto err_setup_rx;
 613
 614         if((err = ixgb_up(adapter)))
 615                 goto err_up;
 616
 617         return 0;
 618
 619 err_up:
 620         ixgb_free_rx_resources(adapter);
 621 err_setup_rx:
 622         ixgb_free_tx_resources(adapter);
 623 err_setup_tx:
 624         ixgb_reset(adapter);
 625
 626         return err;
 627 }
 628
 629 /**
 630  * ixgb_close - Disables a network interface
 631  * @netdev: network interface device structure
 632  *
 633  * Returns 0, this is not allowed to fail
 634  *
 635  * The close entry point is called when an interface is de-activated
 636  * by the OS.  The hardware is still under the drivers control, but
 637  * needs to be disabled.  A global MAC reset is issued to stop the
 638  * hardware, and all transmit and receive resources are freed.
 639  **/
 640
 641 static int
 642 ixgb_close(struct net_device *netdev)
 643 {
 644         struct ixgb_adapter *adapter = netdev->priv;
 645
 646         ixgb_down(adapter, TRUE);
 647
 648         ixgb_free_tx_resources(adapter);
 649         ixgb_free_rx_resources(adapter);
 650
 651         return 0;
 652 }
 653
 654 /**
 655  * ixgb_setup_tx_resources - allocate Tx resources (Descriptors)
 656  * @adapter: board private structure
 657  *
 658  * Return 0 on success, negative on failure
 659  **/
 660
 661 int
 662 ixgb_setup_tx_resources(struct ixgb_adapter *adapter)
 663 {
 664         struct ixgb_desc_ring *txdr = &adapter->tx_ring;
 665         struct pci_dev *pdev = adapter->pdev;
 666         int size;
 667
 668         size = sizeof(struct ixgb_buffer) * txdr->count;
 669         txdr->buffer_info = vmalloc(size);
 670         if(!txdr->buffer_info) {
 671                 return -ENOMEM;
 672         }
 673         memset(txdr->buffer_info, 0, size);
 674
 675         /* round up to nearest 4K */
 676
 677         txdr->size = txdr->count * sizeof(struct ixgb_tx_desc);
 678         IXGB_ROUNDUP(txdr->size, 4096);
 679
 680         txdr->desc = pci_alloc_consistent(pdev, txdr->size, &txdr->dma);
 681         if(!txdr->desc) {
 682                 vfree(txdr->buffer_info);
 683                 return -ENOMEM;
 684         }
 685         memset(txdr->desc, 0, txdr->size);
 686
 687         txdr->next_to_use = 0;
 688         txdr->next_to_clean = 0;
 689
 690         return 0;
 691 }
 692
 693 /**
 694  * ixgb_configure_tx - Configure 82597 Transmit Unit after Reset.
 695  * @adapter: board private structure
 696  *
 697  * Configure the Tx unit of the MAC after a reset.
 698  **/
 699
 700 static void
 701 ixgb_configure_tx(struct ixgb_adapter *adapter)
 702 {
 703         uint64_t tdba = adapter->tx_ring.dma;
 704         uint32_t tdlen = adapter->tx_ring.count * sizeof(struct ixgb_tx_desc);
 705         uint32_t tctl;
 706         struct ixgb_hw *hw = &adapter->hw;
 707
 708         /* Setup the Base and Length of the Tx Descriptor Ring
 709          * tx_ring.dma can be either a 32 or 64 bit value
 710          */
 711
 712         IXGB_WRITE_REG(hw, TDBAL, (tdba & 0x00000000ffffffffULL));
 713         IXGB_WRITE_REG(hw, TDBAH, (tdba >> 32));
 714
 715         IXGB_WRITE_REG(hw, TDLEN, tdlen);
 716
 717         /* Setup the HW Tx Head and Tail descriptor pointers */
 718
 719         IXGB_WRITE_REG(hw, TDH, 0);
 720         IXGB_WRITE_REG(hw, TDT, 0);
 721
 722         /* don't set up txdctl, it induces performance problems if configured
 723          * incorrectly */
 724         /* Set the Tx Interrupt Delay register */
 725
 726         IXGB_WRITE_REG(hw, TIDV, adapter->tx_int_delay);
 727
 728         /* Program the Transmit Control Register */
 729
 730         tctl = IXGB_TCTL_TCE | IXGB_TCTL_TXEN | IXGB_TCTL_TPDE;
 731         IXGB_WRITE_REG(hw, TCTL, tctl);
 732
 733         /* Setup Transmit Descriptor Settings for this adapter */
 734         adapter->tx_cmd_type =
 735                 IXGB_TX_DESC_TYPE
 736                 | (adapter->tx_int_delay_enable ? IXGB_TX_DESC_CMD_IDE : 0);
 737 }
 738
 739 /**
 740  * ixgb_setup_rx_resources - allocate Rx resources (Descriptors)
 741  * @adapter: board private structure
 742  *
 743  * Returns 0 on success, negative on failure
 744  **/
 745
 746 int
 747 ixgb_setup_rx_resources(struct ixgb_adapter *adapter)
 748 {
 749         struct ixgb_desc_ring *rxdr = &adapter->rx_ring;
 750         struct pci_dev *pdev = adapter->pdev;
 751         int size;
 752
 753         size = sizeof(struct ixgb_buffer) * rxdr->count;
 754         rxdr->buffer_info = vmalloc(size);
 755         if(!rxdr->buffer_info) {
 756                 return -ENOMEM;
 757         }
 758         memset(rxdr->buffer_info, 0, size);
 759
 760         /* Round up to nearest 4K */
 761
 762         rxdr->size = rxdr->count * sizeof(struct ixgb_rx_desc);
 763         IXGB_ROUNDUP(rxdr->size, 4096);
 764
 765         rxdr->desc = pci_alloc_consistent(pdev, rxdr->size, &rxdr->dma);
 766
 767         if(!rxdr->desc) {
 768                 vfree(rxdr->buffer_info);
 769                 return -ENOMEM;
 770         }
 771         memset(rxdr->desc, 0, rxdr->size);
 772
 773         rxdr->next_to_clean = 0;
 774         rxdr->next_to_use = 0;
 775
 776         return 0;
 777 }
 778
 779 /**
 780  * ixgb_setup_rctl - configure the receive control register
 781  * @adapter: Board private structure
 782  **/
 783
 784 static void
 785 ixgb_setup_rctl(struct ixgb_adapter *adapter)
 786 {
 787         uint32_t rctl;
 788
 789         rctl = IXGB_READ_REG(&adapter->hw, RCTL);
 790
 791         rctl &= ~(3 << IXGB_RCTL_MO_SHIFT);
 792
 793         rctl |=
 794                 IXGB_RCTL_BAM | IXGB_RCTL_RDMTS_1_2 |
 795                 IXGB_RCTL_RXEN | IXGB_RCTL_CFF |
 796                 (adapter->hw.mc_filter_type << IXGB_RCTL_MO_SHIFT);
 797
 798         rctl |= IXGB_RCTL_SECRC;
 799
 800         switch (adapter->rx_buffer_len) {
 801         case IXGB_RXBUFFER_2048:
 802         default:
 803                 rctl |= IXGB_RCTL_BSIZE_2048;
 804                 break;
 805         case IXGB_RXBUFFER_4096:
 806                 rctl |= IXGB_RCTL_BSIZE_4096;
 807                 break;
 808         case IXGB_RXBUFFER_8192:
 809                 rctl |= IXGB_RCTL_BSIZE_8192;
 810                 break;
 811         case IXGB_RXBUFFER_16384:
 812                 rctl |= IXGB_RCTL_BSIZE_16384;
 813                 break;
 814         }
 815
 816         IXGB_WRITE_REG(&adapter->hw, RCTL, rctl);
 817 }
 818
 819 /**
 820  * ixgb_configure_rx - Configure 82597 Receive Unit after Reset.
 821  * @adapter: board private structure
 822  *
 823  * Configure the Rx unit of the MAC after a reset.
 824  **/
 825
 826 static void
 827 ixgb_configure_rx(struct ixgb_adapter *adapter)
 828 {
 829         uint64_t rdba = adapter->rx_ring.dma;
 830         uint32_t rdlen = adapter->rx_ring.count * sizeof(struct ixgb_rx_desc);
 831         struct ixgb_hw *hw = &adapter->hw;
 832         uint32_t rctl;
 833         uint32_t rxcsum;
 834         uint32_t rxdctl;
 835
 836         /* make sure receives are disabled while setting up the descriptors */
 837
 838         rctl = IXGB_READ_REG(hw, RCTL);
 839         IXGB_WRITE_REG(hw, RCTL, rctl & ~IXGB_RCTL_RXEN);
 840
 841         /* set the Receive Delay Timer Register */
 842
 843         IXGB_WRITE_REG(hw, RDTR, adapter->rx_int_delay);
 844
 845         /* Setup the Base and Length of the Rx Descriptor Ring */
 846
 847         IXGB_WRITE_REG(hw, RDBAL, (rdba & 0x00000000ffffffffULL));
 848         IXGB_WRITE_REG(hw, RDBAH, (rdba >> 32));
 849
 850         IXGB_WRITE_REG(hw, RDLEN, rdlen);
 851
 852         /* Setup the HW Rx Head and Tail Descriptor Pointers */
 853         IXGB_WRITE_REG(hw, RDH, 0);
 854         IXGB_WRITE_REG(hw, RDT, 0);
 855
 856         /* set up pre-fetching of receive buffers so we get some before we
 857          * run out (default hardware behavior is to run out before fetching
 858          * more).  This sets up to fetch if HTHRESH rx descriptors are avail
 859          * and the descriptors in hw cache are below PTHRESH.  This avoids
 860          * the hardware behavior of fetching <=512 descriptors in a single
 861          * burst that pre-empts all other activity, usually causing fifo
 862          * overflows. */
 863         /* use WTHRESH to burst write 16 descriptors or burst when RXT0 */
 864         rxdctl = RXDCTL_WTHRESH_DEFAULT << IXGB_RXDCTL_WTHRESH_SHIFT |
 865                  RXDCTL_HTHRESH_DEFAULT << IXGB_RXDCTL_HTHRESH_SHIFT |
 866                  RXDCTL_PTHRESH_DEFAULT << IXGB_RXDCTL_PTHRESH_SHIFT;
 867         IXGB_WRITE_REG(hw, RXDCTL, rxdctl);
 868
 869         /* Enable Receive Checksum Offload for TCP and UDP */
 870         if(adapter->rx_csum == TRUE) {
 871                 rxcsum = IXGB_READ_REG(hw, RXCSUM);
 872                 rxcsum |= IXGB_RXCSUM_TUOFL;
 873                 IXGB_WRITE_REG(hw, RXCSUM, rxcsum);
 874         }
 875
 876         /* Enable Receives */
 877
 878         IXGB_WRITE_REG(hw, RCTL, rctl);
 879 }
 880
 881 /**
 882  * ixgb_free_tx_resources - Free Tx Resources
 883  * @adapter: board private structure
 884  *
 885  * Free all transmit software resources
 886  **/
 887
 888 void
 889 ixgb_free_tx_resources(struct ixgb_adapter *adapter)
 890 {
 891         struct pci_dev *pdev = adapter->pdev;
 892
 893         ixgb_clean_tx_ring(adapter);
 894
 895         vfree(adapter->tx_ring.buffer_info);
 896         adapter->tx_ring.buffer_info = NULL;
 897
 898         pci_free_consistent(pdev, adapter->tx_ring.size,
 899                             adapter->tx_ring.desc, adapter->tx_ring.dma);
 900
 901         adapter->tx_ring.desc = NULL;
 902 }
 903
 904 static inline void
 905 ixgb_unmap_and_free_tx_resource(struct ixgb_adapter *adapter,
 906                                         struct ixgb_buffer *buffer_info)
 907 {
 908         struct pci_dev *pdev = adapter->pdev;
 909         if(buffer_info->dma) {
 910                 pci_unmap_page(pdev,
 911                            buffer_info->dma,
 912                            buffer_info->length,
 913                            PCI_DMA_TODEVICE);
 914                 buffer_info->dma = 0;
 915         }
 916         if(buffer_info->skb) {
 917                 dev_kfree_skb_any(buffer_info->skb);
 918                 buffer_info->skb = NULL;
 919         }
 920 }
 921
 922 /**
 923  * ixgb_clean_tx_ring - Free Tx Buffers
 924  * @adapter: board private structure
 925  **/
 926
 927 static void
 928 ixgb_clean_tx_ring(struct ixgb_adapter *adapter)
 929 {
 930         struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
 931         struct ixgb_buffer *buffer_info;
 932         unsigned long size;
 933         unsigned int i;
 934
 935         /* Free all the Tx ring sk_buffs */
 936
 937         for(i = 0; i < tx_ring->count; i++) {
 938                 buffer_info = &tx_ring->buffer_info[i];
 939                 ixgb_unmap_and_free_tx_resource(adapter, buffer_info);
 940         }
 941
 942         size = sizeof(struct ixgb_buffer) * tx_ring->count;
 943         memset(tx_ring->buffer_info, 0, size);
 944
 945         /* Zero out the descriptor ring */
 946
 947         memset(tx_ring->desc, 0, tx_ring->size);
 948
 949         tx_ring->next_to_use = 0;
 950         tx_ring->next_to_clean = 0;
 951
 952         IXGB_WRITE_REG(&adapter->hw, TDH, 0);
 953         IXGB_WRITE_REG(&adapter->hw, TDT, 0);
 954 }
 955
 956 /**
 957  * ixgb_free_rx_resources - Free Rx Resources
 958  * @adapter: board private structure
 959  *
 960  * Free all receive software resources
 961  **/
 962
 963 void
 964 ixgb_free_rx_resources(struct ixgb_adapter *adapter)
 965 {
 966         struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
 967         struct pci_dev *pdev = adapter->pdev;
 968
 969         ixgb_clean_rx_ring(adapter);
 970
 971         vfree(rx_ring->buffer_info);
 972         rx_ring->buffer_info = NULL;
 973
 974         pci_free_consistent(pdev, rx_ring->size, rx_ring->desc, rx_ring->dma);
 975
 976         rx_ring->desc = NULL;
 977 }
 978
 979 /**
 980  * ixgb_clean_rx_ring - Free Rx Buffers
 981  * @adapter: board private structure
 982  **/
 983
 984 static void
 985 ixgb_clean_rx_ring(struct ixgb_adapter *adapter)
 986 {
 987         struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
 988         struct ixgb_buffer *buffer_info;
 989         struct pci_dev *pdev = adapter->pdev;
 990         unsigned long size;
 991         unsigned int i;
 992
 993         /* Free all the Rx ring sk_buffs */
 994
 995         for(i = 0; i < rx_ring->count; i++) {
 996                 buffer_info = &rx_ring->buffer_info[i];
 997                 if(buffer_info->skb) {
 998
 999                         pci_unmap_single(pdev,
1000                                          buffer_info->dma,
1001                                          buffer_info->length,
1002                                          PCI_DMA_FROMDEVICE);
1003
1004                         dev_kfree_skb(buffer_info->skb);
1005
1006                         buffer_info->skb = NULL;
1007                 }
1008         }
1009
1010         size = sizeof(struct ixgb_buffer) * rx_ring->count;
1011         memset(rx_ring->buffer_info, 0, size);
1012
1013         /* Zero out the descriptor ring */
1014
1015         memset(rx_ring->desc, 0, rx_ring->size);
1016
1017         rx_ring->next_to_clean = 0;
1018         rx_ring->next_to_use = 0;
1019
1020         IXGB_WRITE_REG(&adapter->hw, RDH, 0);
1021         IXGB_WRITE_REG(&adapter->hw, RDT, 0);
1022 }
1023
1024 /**
1025  * ixgb_set_mac - Change the Ethernet Address of the NIC
1026  * @netdev: network interface device structure
1027  * @p: pointer to an address structure
1028  *
1029  * Returns 0 on success, negative on failure
1030  **/
1031
1032 static int
1033 ixgb_set_mac(struct net_device *netdev, void *p)
1034 {
1035         struct ixgb_adapter *adapter = netdev->priv;
1036         struct sockaddr *addr = p;
1037
1038         if(!is_valid_ether_addr(addr->sa_data))
1039                 return -EADDRNOTAVAIL;
1040
1041         memcpy(netdev->dev_addr, addr->sa_data, netdev->addr_len);
1042
1043         ixgb_rar_set(&adapter->hw, addr->sa_data, 0);
1044
1045         return 0;
1046 }
1047
1048 /**
1049  * ixgb_set_multi - Multicast and Promiscuous mode set
1050  * @netdev: network interface device structure
1051  *
1052  * The set_multi entry point is called whenever the multicast address
1053  * list or the network interface flags are updated.  This routine is
1054  * responsible for configuring the hardware for proper multicast,
1055  * promiscuous mode, and all-multi behavior.
1056  **/
1057
1058 static void
1059 ixgb_set_multi(struct net_device *netdev)
1060 {
1061         struct ixgb_adapter *adapter = netdev->priv;
1062         struct ixgb_hw *hw = &adapter->hw;
1063         struct dev_mc_list *mc_ptr;
1064         uint32_t rctl;
1065         int i;
1066
1067         /* Check for Promiscuous and All Multicast modes */
1068
1069         rctl = IXGB_READ_REG(hw, RCTL);
1070
1071         if(netdev->flags & IFF_PROMISC) {
1072                 rctl |= (IXGB_RCTL_UPE | IXGB_RCTL_MPE);
1073         } else if(netdev->flags & IFF_ALLMULTI) {
1074                 rctl |= IXGB_RCTL_MPE;
1075                 rctl &= ~IXGB_RCTL_UPE;
1076         } else {
1077                 rctl &= ~(IXGB_RCTL_UPE | IXGB_RCTL_MPE);
1078         }
1079
1080         if(netdev->mc_count > IXGB_MAX_NUM_MULTICAST_ADDRESSES) {
1081                 rctl |= IXGB_RCTL_MPE;
1082                 IXGB_WRITE_REG(hw, RCTL, rctl);
1083         } else {
1084                 uint8_t mta[netdev->mc_count * IXGB_ETH_LENGTH_OF_ADDRESS];
1085
1086                 IXGB_WRITE_REG(hw, RCTL, rctl);
1087
1088                 for(i = 0, mc_ptr = netdev->mc_list; mc_ptr;
1089                         i++, mc_ptr = mc_ptr->next)
1090                         memcpy(&mta[i * IXGB_ETH_LENGTH_OF_ADDRESS],
1091                                    mc_ptr->dmi_addr, IXGB_ETH_LENGTH_OF_ADDRESS);
1092
1093                 ixgb_mc_addr_list_update(hw, mta, netdev->mc_count, 0);
1094         }
1095 }
1096
1097 /**
1098  * ixgb_watchdog - Timer Call-back
1099  * @data: pointer to netdev cast into an unsigned long
1100  **/
1101
1102 static void
1103 ixgb_watchdog(unsigned long data)
1104 {
1105         struct ixgb_adapter *adapter = (struct ixgb_adapter *)data;
1106         struct net_device *netdev = adapter->netdev;
1107         struct ixgb_desc_ring *txdr = &adapter->tx_ring;
1108
1109         ixgb_check_for_link(&adapter->hw);
1110
1111         if (ixgb_check_for_bad_link(&adapter->hw)) {
1112                 /* force the reset path */
1113                 netif_stop_queue(netdev);
1114         }
1115
1116         if(adapter->hw.link_up) {
1117                 if(!netif_carrier_ok(netdev)) {
1118                         printk(KERN_INFO "ixgb: %s NIC Link is Up %d Mbps %s\n",
1119                                    netdev->name, 10000, "Full Duplex");
1120                         adapter->link_speed = 10000;
1121                         adapter->link_duplex = FULL_DUPLEX;
1122                         netif_carrier_on(netdev);
1123                         netif_wake_queue(netdev);
1124                 }
1125         } else {
1126                 if(netif_carrier_ok(netdev)) {
1127                         adapter->link_speed = 0;
1128                         adapter->link_duplex = 0;
1129                         printk(KERN_INFO
1130                                    "ixgb: %s NIC Link is Down\n",
1131                                    netdev->name);
1132                         netif_carrier_off(netdev);
1133                         netif_stop_queue(netdev);
1134
1135                 }
1136         }
1137
1138         ixgb_update_stats(adapter);
1139
1140         if(!netif_carrier_ok(netdev)) {
1141                 if(IXGB_DESC_UNUSED(txdr) + 1 < txdr->count) {
1142                         /* We've lost link, so the controller stops DMA,
1143                          * but we've got queued Tx work that's never going
1144                          * to get done, so reset controller to flush Tx.
1145                          * (Do the reset outside of interrupt context). */
1146                         schedule_work(&adapter->tx_timeout_task);
1147                 }
1148         }
1149
1150         /* Force detection of hung controller every watchdog period */
1151         adapter->detect_tx_hung = TRUE;
1152
1153         /* generate an interrupt to force clean up of any stragglers */
1154         IXGB_WRITE_REG(&adapter->hw, ICS, IXGB_INT_TXDW);
1155
1156         /* Reset the timer */
1157         mod_timer(&adapter->watchdog_timer, jiffies + 2 * HZ);
1158 }
1159
1160 #define IXGB_TX_FLAGS_CSUM              0x00000001
1161 #define IXGB_TX_FLAGS_VLAN              0x00000002
1162 #define IXGB_TX_FLAGS_TSO               0x00000004
1163
1164 static inline int
1165 ixgb_tso(struct ixgb_adapter *adapter, struct sk_buff *skb)
1166 {
1167 #ifdef NETIF_F_TSO
1168         struct ixgb_context_desc *context_desc;
1169         unsigned int i;
1170         uint8_t ipcss, ipcso, tucss, tucso, hdr_len;
1171         uint16_t ipcse, tucse, mss;
1172         int err;
1173
1174         if(likely(skb_shinfo(skb)->tso_size)) {
1175                 if (skb_header_cloned(skb)) {
1176                         err = pskb_expand_head(skb, 0, 0, GFP_ATOMIC);
1177                         if (err)
1178                                 return err;
1179                 }
1180
1181                 hdr_len = ((skb->h.raw - skb->data) + (skb->h.th->doff << 2));
1182                 mss = skb_shinfo(skb)->tso_size;
1183                 skb->nh.iph->tot_len = 0;
1184                 skb->nh.iph->check = 0;
1185                 skb->h.th->check = ~csum_tcpudp_magic(skb->nh.iph->saddr,
1186                                                       skb->nh.iph->daddr,
1187                                                       0, IPPROTO_TCP, 0);
1188                 ipcss = skb->nh.raw - skb->data;
1189                 ipcso = (void *)&(skb->nh.iph->check) - (void *)skb->data;
1190                 ipcse = skb->h.raw - skb->data - 1;
1191                 tucss = skb->h.raw - skb->data;
1192                 tucso = (void *)&(skb->h.th->check) - (void *)skb->data;
1193                 tucse = 0;
1194
1195                 i = adapter->tx_ring.next_to_use;
1196                 context_desc = IXGB_CONTEXT_DESC(adapter->tx_ring, i);
1197
1198                 context_desc->ipcss = ipcss;
1199                 context_desc->ipcso = ipcso;
1200                 context_desc->ipcse = cpu_to_le16(ipcse);
1201                 context_desc->tucss = tucss;
1202                 context_desc->tucso = tucso;
1203                 context_desc->tucse = cpu_to_le16(tucse);
1204                 context_desc->mss = cpu_to_le16(mss);
1205                 context_desc->hdr_len = hdr_len;
1206                 context_desc->status = 0;
1207                 context_desc->cmd_type_len = cpu_to_le32(
1208                                                   IXGB_CONTEXT_DESC_TYPE
1209                                                 | IXGB_CONTEXT_DESC_CMD_TSE
1210                                                 | IXGB_CONTEXT_DESC_CMD_IP
1211                                                 | IXGB_CONTEXT_DESC_CMD_TCP
1212                                                 | IXGB_CONTEXT_DESC_CMD_RS
1213                                                 | IXGB_CONTEXT_DESC_CMD_IDE
1214                                                 | (skb->len - (hdr_len)));
1215
1216                 if(++i == adapter->tx_ring.count) i = 0;
1217                 adapter->tx_ring.next_to_use = i;
1218
1219                 return 1;
1220         }
1221 #endif
1222
1223         return 0;
1224 }
1225
1226 static inline boolean_t
1227 ixgb_tx_csum(struct ixgb_adapter *adapter, struct sk_buff *skb)
1228 {
1229         struct ixgb_context_desc *context_desc;
1230         unsigned int i;
1231         uint8_t css, cso;
1232
1233         if(likely(skb->ip_summed == CHECKSUM_HW)) {
1234                 css = skb->h.raw - skb->data;
1235                 cso = (skb->h.raw + skb->csum) - skb->data;
1236
1237                 i = adapter->tx_ring.next_to_use;
1238                 context_desc = IXGB_CONTEXT_DESC(adapter->tx_ring, i);
1239
1240                 context_desc->tucss = css;
1241                 context_desc->tucso = cso;
1242                 context_desc->tucse = 0;
1243                 /* zero out any previously existing data in one instruction */
1244                 *(uint32_t *)&(context_desc->ipcss) = 0;
1245                 context_desc->status = 0;
1246                 context_desc->hdr_len = 0;
1247                 context_desc->mss = 0;
1248                 context_desc->cmd_type_len =
1249                         cpu_to_le32(IXGB_CONTEXT_DESC_TYPE
1250                                         | IXGB_TX_DESC_CMD_RS
1251                                         | IXGB_TX_DESC_CMD_IDE);
1252
1253                 if(++i == adapter->tx_ring.count) i = 0;
1254                 adapter->tx_ring.next_to_use = i;
1255
1256                 return TRUE;
1257         }
1258
1259         return FALSE;
1260 }
1261
1262 #define IXGB_MAX_TXD_PWR        14
1263 #define IXGB_MAX_DATA_PER_TXD   (1<<IXGB_MAX_TXD_PWR)
1264
1265 static inline int
1266 ixgb_tx_map(struct ixgb_adapter *adapter, struct sk_buff *skb,
1267             unsigned int first)
1268 {
1269         struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
1270         struct ixgb_buffer *buffer_info;
1271         int len = skb->len;
1272         unsigned int offset = 0, size, count = 0, i;
1273
1274         unsigned int nr_frags = skb_shinfo(skb)->nr_frags;
1275         unsigned int f;
1276         len -= skb->data_len;
1277
1278         i = tx_ring->next_to_use;
1279
1280         while(len) {
1281                 buffer_info = &tx_ring->buffer_info[i];
1282                 size = min(len, IXGB_MAX_JUMBO_FRAME_SIZE);
1283                 buffer_info->length = size;
1284                 buffer_info->dma =
1285                         pci_map_single(adapter->pdev,
1286                                 skb->data + offset,
1287                                 size,
1288                                 PCI_DMA_TODEVICE);
1289                 buffer_info->time_stamp = jiffies;
1290
1291                 len -= size;
1292                 offset += size;
1293                 count++;
1294                 if(++i == tx_ring->count) i = 0;
1295         }
1296
1297         for(f = 0; f < nr_frags; f++) {
1298                 struct skb_frag_struct *frag;
1299
1300                 frag = &skb_shinfo(skb)->frags[f];
1301                 len = frag->size;
1302                 offset = 0;
1303
1304                 while(len) {
1305                         buffer_info = &tx_ring->buffer_info[i];
1306                         size = min(len, IXGB_MAX_JUMBO_FRAME_SIZE);
1307                         buffer_info->length = size;
1308                         buffer_info->dma =
1309                                 pci_map_page(adapter->pdev,
1310                                         frag->page,
1311                                         frag->page_offset + offset,
1312                                         size,
1313                                         PCI_DMA_TODEVICE);
1314                         buffer_info->time_stamp = jiffies;
1315
1316                         len -= size;
1317                         offset += size;
1318                         count++;
1319                         if(++i == tx_ring->count) i = 0;
1320                 }
1321         }
1322         i = (i == 0) ? tx_ring->count - 1 : i - 1;
1323         tx_ring->buffer_info[i].skb = skb;
1324         tx_ring->buffer_info[first].next_to_watch = i;
1325
1326         return count;
1327 }
1328
1329 static inline void
1330 ixgb_tx_queue(struct ixgb_adapter *adapter, int count, int vlan_id,int tx_flags)
1331 {
1332         struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
1333         struct ixgb_tx_desc *tx_desc = NULL;
1334         struct ixgb_buffer *buffer_info;
1335         uint32_t cmd_type_len = adapter->tx_cmd_type;
1336         uint8_t status = 0;
1337         uint8_t popts = 0;
1338         unsigned int i;
1339
1340         if(tx_flags & IXGB_TX_FLAGS_TSO) {
1341                 cmd_type_len |= IXGB_TX_DESC_CMD_TSE;
1342                 popts |= (IXGB_TX_DESC_POPTS_IXSM | IXGB_TX_DESC_POPTS_TXSM);
1343         }
1344
1345         if(tx_flags & IXGB_TX_FLAGS_CSUM)
1346                 popts |= IXGB_TX_DESC_POPTS_TXSM;
1347
1348         if(tx_flags & IXGB_TX_FLAGS_VLAN) {
1349                 cmd_type_len |= IXGB_TX_DESC_CMD_VLE;
1350         }
1351
1352         i = tx_ring->next_to_use;
1353
1354         while(count--) {
1355                 buffer_info = &tx_ring->buffer_info[i];
1356                 tx_desc = IXGB_TX_DESC(*tx_ring, i);
1357                 tx_desc->buff_addr = cpu_to_le64(buffer_info->dma);
1358                 tx_desc->cmd_type_len =
1359                         cpu_to_le32(cmd_type_len | buffer_info->length);
1360                 tx_desc->status = status;
1361                 tx_desc->popts = popts;
1362                 tx_desc->vlan = cpu_to_le16(vlan_id);
1363
1364                 if(++i == tx_ring->count) i = 0;
1365         }
1366
1367         tx_desc->cmd_type_len |= cpu_to_le32(IXGB_TX_DESC_CMD_EOP
1368                                 | IXGB_TX_DESC_CMD_RS );
1369
1370         /* Force memory writes to complete before letting h/w
1371          * know there are new descriptors to fetch.  (Only
1372          * applicable for weak-ordered memory model archs,
1373          * such as IA-64). */
1374         wmb();
1375
1376         tx_ring->next_to_use = i;
1377         IXGB_WRITE_REG(&adapter->hw, TDT, i);
1378 }
1379
1380 /* Tx Descriptors needed, worst case */
1381 #define TXD_USE_COUNT(S) (((S) >> IXGB_MAX_TXD_PWR) + \
1382                          (((S) & (IXGB_MAX_DATA_PER_TXD - 1)) ? 1 : 0))
1383 #define DESC_NEEDED TXD_USE_COUNT(IXGB_MAX_DATA_PER_TXD) + \
1384         MAX_SKB_FRAGS * TXD_USE_COUNT(PAGE_SIZE) + 1
1385
1386 static int
1387 ixgb_xmit_frame(struct sk_buff *skb, struct net_device *netdev)
1388 {
1389         struct ixgb_adapter *adapter = netdev->priv;
1390         unsigned int first;
1391         unsigned int tx_flags = 0;
1392         unsigned long flags;
1393         int vlan_id = 0;
1394         int tso;
1395
1396         if(skb->len <= 0) {
1397                 dev_kfree_skb_any(skb);
1398                 return 0;
1399         }
1400
1401         spin_lock_irqsave(&adapter->tx_lock, flags);
1402         if(unlikely(IXGB_DESC_UNUSED(&adapter->tx_ring) < DESC_NEEDED)) {
1403                 netif_stop_queue(netdev);
1404                 spin_unlock_irqrestore(&adapter->tx_lock, flags);
1405                 return 1;
1406         }
1407         spin_unlock_irqrestore(&adapter->tx_lock, flags);
1408
1409         if(adapter->vlgrp && vlan_tx_tag_present(skb)) {
1410                 tx_flags |= IXGB_TX_FLAGS_VLAN;
1411                 vlan_id = vlan_tx_tag_get(skb);
1412         }
1413
1414         first = adapter->tx_ring.next_to_use;
1415
1416         tso = ixgb_tso(adapter, skb);
1417         if (tso < 0) {
1418                 dev_kfree_skb_any(skb);
1419                 return NETDEV_TX_OK;
1420         }
1421
1422         if (tso)
1423                 tx_flags |= IXGB_TX_FLAGS_TSO;
1424         else if(ixgb_tx_csum(adapter, skb))
1425                 tx_flags |= IXGB_TX_FLAGS_CSUM;
1426
1427         ixgb_tx_queue(adapter, ixgb_tx_map(adapter, skb, first), vlan_id,
1428                         tx_flags);
1429
1430         netdev->trans_start = jiffies;
1431
1432         return 0;
1433 }
1434
1435 /**
1436  * ixgb_tx_timeout - Respond to a Tx Hang
1437  * @netdev: network interface device structure
1438  **/
1439
1440 static void
1441 ixgb_tx_timeout(struct net_device *netdev)
1442 {
1443         struct ixgb_adapter *adapter = netdev->priv;
1444
1445         /* Do the reset outside of interrupt context */
1446         schedule_work(&adapter->tx_timeout_task);
1447 }
1448
1449 static void
1450 ixgb_tx_timeout_task(struct net_device *netdev)
1451 {
1452         struct ixgb_adapter *adapter = netdev->priv;
1453
1454         ixgb_down(adapter, TRUE);
1455         ixgb_up(adapter);
1456 }
1457
1458 /**
1459  * ixgb_get_stats - Get System Network Statistics
1460  * @netdev: network interface device structure
1461  *
1462  * Returns the address of the device statistics structure.
1463  * The statistics are actually updated from the timer callback.
1464  **/
1465
1466 static struct net_device_stats *
1467 ixgb_get_stats(struct net_device *netdev)
1468 {
1469         struct ixgb_adapter *adapter = netdev->priv;
1470
1471         return &adapter->net_stats;
1472 }
1473
1474 /**
1475  * ixgb_change_mtu - Change the Maximum Transfer Unit
1476  * @netdev: network interface device structure
1477  * @new_mtu: new value for maximum frame size
1478  *
1479  * Returns 0 on success, negative on failure
1480  **/
1481
1482 static int
1483 ixgb_change_mtu(struct net_device *netdev, int new_mtu)
1484 {
1485         struct ixgb_adapter *adapter = netdev->priv;
1486         int max_frame = new_mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;
1487         int old_max_frame = netdev->mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;
1488
1489
1490         if((max_frame < IXGB_MIN_ENET_FRAME_SIZE_WITHOUT_FCS + ENET_FCS_LENGTH)
1491            || (max_frame > IXGB_MAX_JUMBO_FRAME_SIZE + ENET_FCS_LENGTH)) {
1492                 IXGB_ERR("Invalid MTU setting\n");
1493                 return -EINVAL;
1494         }
1495
1496         if((max_frame <= IXGB_MAX_ENET_FRAME_SIZE_WITHOUT_FCS + ENET_FCS_LENGTH)
1497            || (max_frame <= IXGB_RXBUFFER_2048)) {
1498                 adapter->rx_buffer_len = IXGB_RXBUFFER_2048;
1499
1500         } else if(max_frame <= IXGB_RXBUFFER_4096) {
1501                 adapter->rx_buffer_len = IXGB_RXBUFFER_4096;
1502
1503         } else if(max_frame <= IXGB_RXBUFFER_8192) {
1504                 adapter->rx_buffer_len = IXGB_RXBUFFER_8192;
1505
1506         } else {
1507                 adapter->rx_buffer_len = IXGB_RXBUFFER_16384;
1508         }
1509
1510         netdev->mtu = new_mtu;
1511
1512         if(old_max_frame != max_frame && netif_running(netdev)) {
1513
1514                 ixgb_down(adapter, TRUE);
1515                 ixgb_up(adapter);
1516         }
1517
1518         return 0;
1519 }
1520
1521 /**
1522  * ixgb_update_stats - Update the board statistics counters.
1523  * @adapter: board private structure
1524  **/
1525
1526 void
1527 ixgb_update_stats(struct ixgb_adapter *adapter)
1528 {
1529         adapter->stats.tprl += IXGB_READ_REG(&adapter->hw, TPRL);
1530         adapter->stats.tprh += IXGB_READ_REG(&adapter->hw, TPRH);
1531         adapter->stats.gprcl += IXGB_READ_REG(&adapter->hw, GPRCL);
1532         adapter->stats.gprch += IXGB_READ_REG(&adapter->hw, GPRCH);
1533         adapter->stats.bprcl += IXGB_READ_REG(&adapter->hw, BPRCL);
1534         adapter->stats.bprch += IXGB_READ_REG(&adapter->hw, BPRCH);
1535         adapter->stats.mprcl += IXGB_READ_REG(&adapter->hw, MPRCL);
1536         adapter->stats.mprch += IXGB_READ_REG(&adapter->hw, MPRCH);
1537         adapter->stats.uprcl += IXGB_READ_REG(&adapter->hw, UPRCL);
1538         adapter->stats.uprch += IXGB_READ_REG(&adapter->hw, UPRCH);
1539         adapter->stats.vprcl += IXGB_READ_REG(&adapter->hw, VPRCL);
1540         adapter->stats.vprch += IXGB_READ_REG(&adapter->hw, VPRCH);
1541         adapter->stats.jprcl += IXGB_READ_REG(&adapter->hw, JPRCL);
1542         adapter->stats.jprch += IXGB_READ_REG(&adapter->hw, JPRCH);
1543         adapter->stats.gorcl += IXGB_READ_REG(&adapter->hw, GORCL);
1544         adapter->stats.gorch += IXGB_READ_REG(&adapter->hw, GORCH);
1545         adapter->stats.torl += IXGB_READ_REG(&adapter->hw, TORL);
1546         adapter->stats.torh += IXGB_READ_REG(&adapter->hw, TORH);
1547         adapter->stats.rnbc += IXGB_READ_REG(&adapter->hw, RNBC);
1548         adapter->stats.ruc += IXGB_READ_REG(&adapter->hw, RUC);
1549         adapter->stats.roc += IXGB_READ_REG(&adapter->hw, ROC);
1550         adapter->stats.rlec += IXGB_READ_REG(&adapter->hw, RLEC);
1551         adapter->stats.crcerrs += IXGB_READ_REG(&adapter->hw, CRCERRS);
1552         adapter->stats.icbc += IXGB_READ_REG(&adapter->hw, ICBC);
1553         adapter->stats.ecbc += IXGB_READ_REG(&adapter->hw, ECBC);
1554         adapter->stats.mpc += IXGB_READ_REG(&adapter->hw, MPC);
1555         adapter->stats.tptl += IXGB_READ_REG(&adapter->hw, TPTL);
1556         adapter->stats.tpth += IXGB_READ_REG(&adapter->hw, TPTH);
1557         adapter->stats.gptcl += IXGB_READ_REG(&adapter->hw, GPTCL);
1558         adapter->stats.gptch += IXGB_READ_REG(&adapter->hw, GPTCH);
1559         adapter->stats.bptcl += IXGB_READ_REG(&adapter->hw, BPTCL);
1560         adapter->stats.bptch += IXGB_READ_REG(&adapter->hw, BPTCH);
1561         adapter->stats.mptcl += IXGB_READ_REG(&adapter->hw, MPTCL);
1562         adapter->stats.mptch += IXGB_READ_REG(&adapter->hw, MPTCH);
1563         adapter->stats.uptcl += IXGB_READ_REG(&adapter->hw, UPTCL);
1564         adapter->stats.uptch += IXGB_READ_REG(&adapter->hw, UPTCH);
1565         adapter->stats.vptcl += IXGB_READ_REG(&adapter->hw, VPTCL);
1566         adapter->stats.vptch += IXGB_READ_REG(&adapter->hw, VPTCH);
1567         adapter->stats.jptcl += IXGB_READ_REG(&adapter->hw, JPTCL);
1568         adapter->stats.jptch += IXGB_READ_REG(&adapter->hw, JPTCH);
1569         adapter->stats.gotcl += IXGB_READ_REG(&adapter->hw, GOTCL);
1570         adapter->stats.gotch += IXGB_READ_REG(&adapter->hw, GOTCH);
1571         adapter->stats.totl += IXGB_READ_REG(&adapter->hw, TOTL);
1572         adapter->stats.toth += IXGB_READ_REG(&adapter->hw, TOTH);
1573         adapter->stats.dc += IXGB_READ_REG(&adapter->hw, DC);
1574         adapter->stats.plt64c += IXGB_READ_REG(&adapter->hw, PLT64C);
1575         adapter->stats.tsctc += IXGB_READ_REG(&adapter->hw, TSCTC);
1576         adapter->stats.tsctfc += IXGB_READ_REG(&adapter->hw, TSCTFC);
1577         adapter->stats.ibic += IXGB_READ_REG(&adapter->hw, IBIC);
1578         adapter->stats.rfc += IXGB_READ_REG(&adapter->hw, RFC);
1579         adapter->stats.lfc += IXGB_READ_REG(&adapter->hw, LFC);
1580         adapter->stats.pfrc += IXGB_READ_REG(&adapter->hw, PFRC);
1581         adapter->stats.pftc += IXGB_READ_REG(&adapter->hw, PFTC);
1582         adapter->stats.mcfrc += IXGB_READ_REG(&adapter->hw, MCFRC);
1583         adapter->stats.mcftc += IXGB_READ_REG(&adapter->hw, MCFTC);
1584         adapter->stats.xonrxc += IXGB_READ_REG(&adapter->hw, XONRXC);
1585         adapter->stats.xontxc += IXGB_READ_REG(&adapter->hw, XONTXC);
1586         adapter->stats.xoffrxc += IXGB_READ_REG(&adapter->hw, XOFFRXC);
1587         adapter->stats.xofftxc += IXGB_READ_REG(&adapter->hw, XOFFTXC);
1588         adapter->stats.rjc += IXGB_READ_REG(&adapter->hw, RJC);
1589
1590         /* Fill out the OS statistics structure */
1591
1592         adapter->net_stats.rx_packets = adapter->stats.gprcl;
1593         adapter->net_stats.tx_packets = adapter->stats.gptcl;
1594         adapter->net_stats.rx_bytes = adapter->stats.gorcl;
1595         adapter->net_stats.tx_bytes = adapter->stats.gotcl;
1596         adapter->net_stats.multicast = adapter->stats.mprcl;
1597         adapter->net_stats.collisions = 0;
1598
1599         /* ignore RLEC as it reports errors for padded (<64bytes) frames
1600          * with a length in the type/len field */
1601         adapter->net_stats.rx_errors =
1602             /* adapter->stats.rnbc + */ adapter->stats.crcerrs +
1603             adapter->stats.ruc +
1604             adapter->stats.roc /*+ adapter->stats.rlec */  +
1605             adapter->stats.icbc +
1606             adapter->stats.ecbc + adapter->stats.mpc;
1607
1608         adapter->net_stats.rx_dropped = adapter->stats.mpc;
1609
1610         /* see above
1611          * adapter->net_stats.rx_length_errors = adapter->stats.rlec;
1612          */
1613
1614         adapter->net_stats.rx_crc_errors = adapter->stats.crcerrs;
1615         adapter->net_stats.rx_fifo_errors = adapter->stats.mpc;
1616         adapter->net_stats.rx_missed_errors = adapter->stats.mpc;
1617         adapter->net_stats.rx_over_errors = adapter->stats.mpc;
1618
1619         adapter->net_stats.tx_errors = 0;
1620         adapter->net_stats.rx_frame_errors = 0;
1621         adapter->net_stats.tx_aborted_errors = 0;
1622         adapter->net_stats.tx_carrier_errors = 0;
1623         adapter->net_stats.tx_fifo_errors = 0;
1624         adapter->net_stats.tx_heartbeat_errors = 0;
1625         adapter->net_stats.tx_window_errors = 0;
1626 }
1627
1628 #define IXGB_MAX_INTR 10
1629 /**
1630  * ixgb_intr - Interrupt Handler
1631  * @irq: interrupt number
1632  * @data: pointer to a network interface device structure
1633  * @pt_regs: CPU registers structure
1634  **/
1635
1636 static irqreturn_t
1637 ixgb_intr(int irq, void *data, struct pt_regs *regs)
1638 {
1639         struct net_device *netdev = data;
1640         struct ixgb_adapter *adapter = netdev->priv;
1641         struct ixgb_hw *hw = &adapter->hw;
1642         uint32_t icr = IXGB_READ_REG(hw, ICR);
1643 #ifndef CONFIG_IXGB_NAPI
1644         unsigned int i;
1645 #endif
1646
1647         if(unlikely(!icr))
1648                 return IRQ_NONE;  /* Not our interrupt */
1649
1650         if(unlikely(icr & (IXGB_INT_RXSEQ | IXGB_INT_LSC))) {
1651                 mod_timer(&adapter->watchdog_timer, jiffies);
1652         }
1653
1654 #ifdef CONFIG_IXGB_NAPI
1655         if(netif_rx_schedule_prep(netdev)) {
1656
1657                 /* Disable interrupts and register for poll. The flush
1658                   of the posted write is intentionally left out.
1659                 */
1660
1661                 atomic_inc(&adapter->irq_sem);
1662                 IXGB_WRITE_REG(&adapter->hw, IMC, ~0);
1663                 __netif_rx_schedule(netdev);
1664         }
1665 #else
1666         /* yes, that is actually a & and it is meant to make sure that
1667          * every pass through this for loop checks both receive and
1668          * transmit queues for completed descriptors, intended to
1669          * avoid starvation issues and assist tx/rx fairness. */
1670         for(i = 0; i < IXGB_MAX_INTR; i++)
1671                 if(!ixgb_clean_rx_irq(adapter) &
1672                    !ixgb_clean_tx_irq(adapter))
1673                         break;
1674 #endif
1675         return IRQ_HANDLED;
1676 }
1677
1678 #ifdef CONFIG_IXGB_NAPI
1679 /**
1680  * ixgb_clean - NAPI Rx polling callback
1681  * @adapter: board private structure
1682  **/
1683
1684 static int
1685 ixgb_clean(struct net_device *netdev, int *budget)
1686 {
1687         struct ixgb_adapter *adapter = netdev->priv;
1688         int work_to_do = min(*budget, netdev->quota);
1689         int tx_cleaned;
1690         int work_done = 0;
1691
1692         tx_cleaned = ixgb_clean_tx_irq(adapter);
1693         ixgb_clean_rx_irq(adapter, &work_done, work_to_do);
1694
1695         *budget -= work_done;
1696         netdev->quota -= work_done;
1697
1698         /* if no Tx and not enough Rx work done, exit the polling mode */
1699         if((!tx_cleaned && (work_done == 0)) || !netif_running(netdev)) {
1700                 netif_rx_complete(netdev);
1701                 ixgb_irq_enable(adapter);
1702                 return 0;
1703         }
1704
1705         return 1;
1706 }
1707 #endif
1708
1709 /**
1710  * ixgb_clean_tx_irq - Reclaim resources after transmit completes
1711  * @adapter: board private structure
1712  **/
1713
1714 static boolean_t
1715 ixgb_clean_tx_irq(struct ixgb_adapter *adapter)
1716 {
1717         struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
1718         struct net_device *netdev = adapter->netdev;
1719         struct ixgb_tx_desc *tx_desc, *eop_desc;
1720         struct ixgb_buffer *buffer_info;
1721         unsigned int i, eop;
1722         boolean_t cleaned = FALSE;
1723
1724         i = tx_ring->next_to_clean;
1725         eop = tx_ring->buffer_info[i].next_to_watch;
1726         eop_desc = IXGB_TX_DESC(*tx_ring, eop);
1727
1728         while(eop_desc->status & IXGB_TX_DESC_STATUS_DD) {
1729
1730                 for(cleaned = FALSE; !cleaned; ) {
1731                         tx_desc = IXGB_TX_DESC(*tx_ring, i);
1732                         buffer_info = &tx_ring->buffer_info[i];
1733
1734                         if (tx_desc->popts
1735                             & (IXGB_TX_DESC_POPTS_TXSM |
1736                                IXGB_TX_DESC_POPTS_IXSM))
1737                                 adapter->hw_csum_tx_good++;
1738
1739                         ixgb_unmap_and_free_tx_resource(adapter, buffer_info);
1740
1741                         *(uint32_t *)&(tx_desc->status) = 0;
1742
1743                         cleaned = (i == eop);
1744                         if(++i == tx_ring->count) i = 0;
1745                 }
1746
1747                 eop = tx_ring->buffer_info[i].next_to_watch;
1748                 eop_desc = IXGB_TX_DESC(*tx_ring, eop);
1749         }
1750
1751         tx_ring->next_to_clean = i;
1752
1753         spin_lock(&adapter->tx_lock);
1754         if(cleaned && netif_queue_stopped(netdev) && netif_carrier_ok(netdev) &&
1755            (IXGB_DESC_UNUSED(tx_ring) > IXGB_TX_QUEUE_WAKE)) {
1756
1757                 netif_wake_queue(netdev);
1758         }
1759         spin_unlock(&adapter->tx_lock);
1760
1761         if(adapter->detect_tx_hung) {
1762                 /* detect a transmit hang in hardware, this serializes the
1763                  * check with the clearing of time_stamp and movement of i */
1764                 adapter->detect_tx_hung = FALSE;
1765                 if(tx_ring->buffer_info[i].dma &&
1766                    time_after(jiffies, tx_ring->buffer_info[i].time_stamp + HZ)
1767                    && !(IXGB_READ_REG(&adapter->hw, STATUS) &
1768                         IXGB_STATUS_TXOFF))
1769                         netif_stop_queue(netdev);
1770         }
1771
1772         return cleaned;
1773 }
1774
1775 /**
1776  * ixgb_rx_checksum - Receive Checksum Offload for 82597.
1777  * @adapter: board private structure
1778  * @rx_desc: receive descriptor
1779  * @sk_buff: socket buffer with received data
1780  **/
1781
1782 static inline void
1783 ixgb_rx_checksum(struct ixgb_adapter *adapter,
1784                  struct ixgb_rx_desc *rx_desc,
1785                  struct sk_buff *skb)
1786 {
1787         /* Ignore Checksum bit is set OR
1788          * TCP Checksum has not been calculated
1789          */
1790         if((rx_desc->status & IXGB_RX_DESC_STATUS_IXSM) ||
1791            (!(rx_desc->status & IXGB_RX_DESC_STATUS_TCPCS))) {
1792                 skb->ip_summed = CHECKSUM_NONE;
1793                 return;
1794         }
1795
1796         /* At this point we know the hardware did the TCP checksum */
1797         /* now look at the TCP checksum error bit */
1798         if(rx_desc->errors & IXGB_RX_DESC_ERRORS_TCPE) {
1799                 /* let the stack verify checksum errors */
1800                 skb->ip_summed = CHECKSUM_NONE;
1801                 adapter->hw_csum_rx_error++;
1802         } else {
1803                 /* TCP checksum is good */
1804                 skb->ip_summed = CHECKSUM_UNNECESSARY;
1805                 adapter->hw_csum_rx_good++;
1806         }
1807 }
1808
1809 /**
1810  * ixgb_clean_rx_irq - Send received data up the network stack,
1811  * @adapter: board private structure
1812  **/
1813
1814 static boolean_t
1815 #ifdef CONFIG_IXGB_NAPI
1816 ixgb_clean_rx_irq(struct ixgb_adapter *adapter, int *work_done, int work_to_do)
1817 #else
1818 ixgb_clean_rx_irq(struct ixgb_adapter *adapter)
1819 #endif
1820 {
1821         struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
1822         struct net_device *netdev = adapter->netdev;
1823         struct pci_dev *pdev = adapter->pdev;
1824         struct ixgb_rx_desc *rx_desc, *next_rxd;
1825         struct ixgb_buffer *buffer_info, *next_buffer, *next2_buffer;
1826         struct sk_buff *skb, *next_skb;
1827         uint32_t length;
1828         unsigned int i, j;
1829         boolean_t cleaned = FALSE;
1830
1831         i = rx_ring->next_to_clean;
1832         rx_desc = IXGB_RX_DESC(*rx_ring, i);
1833         buffer_info = &rx_ring->buffer_info[i];
1834
1835         while(rx_desc->status & IXGB_RX_DESC_STATUS_DD) {
1836
1837 #ifdef CONFIG_IXGB_NAPI
1838                 if(*work_done >= work_to_do)
1839                         break;
1840
1841                 (*work_done)++;
1842 #endif
1843                 skb = buffer_info->skb;
1844                 prefetch(skb->data);
1845
1846                 if(++i == rx_ring->count) i = 0;
1847                 next_rxd = IXGB_RX_DESC(*rx_ring, i);
1848                 prefetch(next_rxd);
1849
1850                 if((j = i + 1) == rx_ring->count) j = 0;
1851                 next2_buffer = &rx_ring->buffer_info[j];
1852                 prefetch(next2_buffer);
1853
1854                 next_buffer = &rx_ring->buffer_info[i];
1855                 next_skb = next_buffer->skb;
1856                 prefetch(next_skb);
1857
1858
1859                 cleaned = TRUE;
1860
1861                 pci_unmap_single(pdev,
1862                                  buffer_info->dma,
1863                                  buffer_info->length,
1864                                  PCI_DMA_FROMDEVICE);
1865
1866                 length = le16_to_cpu(rx_desc->length);
1867
1868                 if(unlikely(!(rx_desc->status & IXGB_RX_DESC_STATUS_EOP))) {
1869
1870                         /* All receives must fit into a single buffer */
1871
1872                         IXGB_DBG("Receive packet consumed multiple buffers "
1873                                          "length<%x>\n", length);
1874
1875                         dev_kfree_skb_irq(skb);
1876                         rx_desc->status = 0;
1877                         buffer_info->skb = NULL;
1878
1879                         rx_desc = next_rxd;
1880                         buffer_info = next_buffer;
1881                         continue;
1882                 }
1883
1884                 if (unlikely(rx_desc->errors
1885                              & (IXGB_RX_DESC_ERRORS_CE | IXGB_RX_DESC_ERRORS_SE
1886                                 | IXGB_RX_DESC_ERRORS_P |
1887                                 IXGB_RX_DESC_ERRORS_RXE))) {
1888
1889                         dev_kfree_skb_irq(skb);
1890                         rx_desc->status = 0;
1891                         buffer_info->skb = NULL;
1892
1893                         rx_desc = next_rxd;
1894                         buffer_info = next_buffer;
1895                         continue;
1896                 }
1897
1898                 /* Good Receive */
1899                 skb_put(skb, length);
1900
1901                 /* Receive Checksum Offload */
1902                 ixgb_rx_checksum(adapter, rx_desc, skb);
1903
1904                 skb->protocol = eth_type_trans(skb, netdev);
1905 #ifdef CONFIG_IXGB_NAPI
1906                 if(adapter->vlgrp && (rx_desc->status & IXGB_RX_DESC_STATUS_VP)) {
1907                         vlan_hwaccel_receive_skb(skb, adapter->vlgrp,
1908                                 le16_to_cpu(rx_desc->special) &
1909                                         IXGB_RX_DESC_SPECIAL_VLAN_MASK);
1910                 } else {
1911                         netif_receive_skb(skb);
1912                 }
1913 #else /* CONFIG_IXGB_NAPI */
1914                 if(adapter->vlgrp && (rx_desc->status & IXGB_RX_DESC_STATUS_VP)) {
1915                         vlan_hwaccel_rx(skb, adapter->vlgrp,
1916                                 le16_to_cpu(rx_desc->special) &
1917                                         IXGB_RX_DESC_SPECIAL_VLAN_MASK);
1918                 } else {
1919                         netif_rx(skb);
1920                 }
1921 #endif /* CONFIG_IXGB_NAPI */
1922                 netdev->last_rx = jiffies;
1923
1924                 rx_desc->status = 0;
1925                 buffer_info->skb = NULL;
1926
1927                 rx_desc = next_rxd;
1928                 buffer_info = next_buffer;
1929         }
1930
1931         rx_ring->next_to_clean = i;
1932
1933         ixgb_alloc_rx_buffers(adapter);
1934
1935         return cleaned;
1936 }
1937
1938 /**
1939  * ixgb_alloc_rx_buffers - Replace used receive buffers
1940  * @adapter: address of board private structure
1941  **/
1942
1943 static void
1944 ixgb_alloc_rx_buffers(struct ixgb_adapter *adapter)
1945 {
1946         struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
1947         struct net_device *netdev = adapter->netdev;
1948         struct pci_dev *pdev = adapter->pdev;
1949         struct ixgb_rx_desc *rx_desc;
1950         struct ixgb_buffer *buffer_info;
1951         struct sk_buff *skb;
1952         unsigned int i;
1953         int num_group_tail_writes;
1954         long cleancount;
1955
1956         i = rx_ring->next_to_use;
1957         buffer_info = &rx_ring->buffer_info[i];
1958         cleancount = IXGB_DESC_UNUSED(rx_ring);
1959
1960         num_group_tail_writes = IXGB_RX_BUFFER_WRITE;
1961
1962         /* leave one descriptor unused */
1963         while(--cleancount > 0) {
1964                 rx_desc = IXGB_RX_DESC(*rx_ring, i);
1965
1966                 skb = dev_alloc_skb(adapter->rx_buffer_len + NET_IP_ALIGN);
1967
1968                 if(unlikely(!skb)) {
1969                         /* Better luck next round */
1970                         break;
1971                 }
1972
1973                 /* Make buffer alignment 2 beyond a 16 byte boundary
1974                  * this will result in a 16 byte aligned IP header after
1975                  * the 14 byte MAC header is removed
1976                  */
1977                 skb_reserve(skb, NET_IP_ALIGN);
1978
1979                 skb->dev = netdev;
1980
1981                 buffer_info->skb = skb;
1982                 buffer_info->length = adapter->rx_buffer_len;
1983                 buffer_info->dma =
1984                         pci_map_single(pdev,
1985                                    skb->data,
1986                                    adapter->rx_buffer_len,
1987                                    PCI_DMA_FROMDEVICE);
1988
1989                 rx_desc->buff_addr = cpu_to_le64(buffer_info->dma);
1990
1991                 if((i & ~(num_group_tail_writes- 1)) == i) {
1992                         /* Force memory writes to complete before letting h/w
1993                          * know there are new descriptors to fetch.  (Only
1994                          * applicable for weak-ordered memory model archs,
1995                          * such as IA-64). */
1996                         wmb();
1997
1998                         IXGB_WRITE_REG(&adapter->hw, RDT, i);
1999                 }
2000
2001                 if(++i == rx_ring->count) i = 0;
2002                 buffer_info = &rx_ring->buffer_info[i];
2003         }
2004
2005         rx_ring->next_to_use = i;
2006 }
2007
2008 /**
2009  * ixgb_vlan_rx_register - enables or disables vlan tagging/stripping.
2010  *
2011  * @param netdev network interface device structure
2012  * @param grp indicates to enable or disable tagging/stripping
2013  **/
2014 static void
2015 ixgb_vlan_rx_register(struct net_device *netdev, struct vlan_group *grp)
2016 {
2017         struct ixgb_adapter *adapter = netdev->priv;
2018         uint32_t ctrl, rctl;
2019
2020         ixgb_irq_disable(adapter);
2021         adapter->vlgrp = grp;
2022
2023         if(grp) {
2024                 /* enable VLAN tag insert/strip */
2025                 ctrl = IXGB_READ_REG(&adapter->hw, CTRL0);
2026                 ctrl |= IXGB_CTRL0_VME;
2027                 IXGB_WRITE_REG(&adapter->hw, CTRL0, ctrl);
2028
2029                 /* enable VLAN receive filtering */
2030
2031                 rctl = IXGB_READ_REG(&adapter->hw, RCTL);
2032                 rctl |= IXGB_RCTL_VFE;
2033                 rctl &= ~IXGB_RCTL_CFIEN;
2034                 IXGB_WRITE_REG(&adapter->hw, RCTL, rctl);
2035         } else {
2036                 /* disable VLAN tag insert/strip */
2037
2038                 ctrl = IXGB_READ_REG(&adapter->hw, CTRL0);
2039                 ctrl &= ~IXGB_CTRL0_VME;
2040                 IXGB_WRITE_REG(&adapter->hw, CTRL0, ctrl);
2041
2042                 /* disable VLAN filtering */
2043
2044                 rctl = IXGB_READ_REG(&adapter->hw, RCTL);
2045                 rctl &= ~IXGB_RCTL_VFE;
2046                 IXGB_WRITE_REG(&adapter->hw, RCTL, rctl);
2047         }
2048
2049         ixgb_irq_enable(adapter);
2050 }
2051
2052 static void
2053 ixgb_vlan_rx_add_vid(struct net_device *netdev, uint16_t vid)
2054 {
2055         struct ixgb_adapter *adapter = netdev->priv;
2056         uint32_t vfta, index;
2057
2058         /* add VID to filter table */
2059
2060         index = (vid >> 5) & 0x7F;
2061         vfta = IXGB_READ_REG_ARRAY(&adapter->hw, VFTA, index);
2062         vfta |= (1 << (vid & 0x1F));
2063         ixgb_write_vfta(&adapter->hw, index, vfta);
2064 }
2065
2066 static void
2067 ixgb_vlan_rx_kill_vid(struct net_device *netdev, uint16_t vid)
2068 {
2069         struct ixgb_adapter *adapter = netdev->priv;
2070         uint32_t vfta, index;
2071
2072         ixgb_irq_disable(adapter);
2073
2074         if(adapter->vlgrp)
2075                 adapter->vlgrp->vlan_devices[vid] = NULL;
2076
2077         ixgb_irq_enable(adapter);
2078
2079         /* remove VID from filter table*/
2080
2081         index = (vid >> 5) & 0x7F;
2082         vfta = IXGB_READ_REG_ARRAY(&adapter->hw, VFTA, index);
2083         vfta &= ~(1 << (vid & 0x1F));
2084         ixgb_write_vfta(&adapter->hw, index, vfta);
2085 }
2086
2087 static void
2088 ixgb_restore_vlan(struct ixgb_adapter *adapter)
2089 {
2090         ixgb_vlan_rx_register(adapter->netdev, adapter->vlgrp);
2091
2092         if(adapter->vlgrp) {
2093                 uint16_t vid;
2094                 for(vid = 0; vid < VLAN_GROUP_ARRAY_LEN; vid++) {
2095                         if(!adapter->vlgrp->vlan_devices[vid])
2096                                 continue;
2097                         ixgb_vlan_rx_add_vid(adapter->netdev, vid);
2098                 }
2099         }
2100 }
2101
2102 /**
2103  * ixgb_notify_reboot - handles OS notification of reboot event.
2104  * @param nb notifier block, unused
2105  * @param event Event being passed to driver to act upon
2106  * @param p A pointer to our net device
2107  **/
2108 static int
2109 ixgb_notify_reboot(struct notifier_block *nb, unsigned long event, void *p)
2110 {
2111         struct pci_dev *pdev = NULL;
2112
2113         switch(event) {
2114         case SYS_DOWN:
2115         case SYS_HALT:
2116         case SYS_POWER_OFF:
2117                 while ((pdev = pci_find_device(PCI_ANY_ID, PCI_ANY_ID, pdev))) {
2118                         if (pci_dev_driver(pdev) == &ixgb_driver)
2119                                 ixgb_suspend(pdev, 3);
2120                 }
2121         }
2122         return NOTIFY_DONE;
2123 }
2124
2125 /**
2126  * ixgb_suspend - driver suspend function called from notify.
2127  * @param pdev pci driver structure used for passing to
2128  * @param state power state to enter
2129  **/
2130 static int
2131 ixgb_suspend(struct pci_dev *pdev, uint32_t state)
2132 {
2133         struct net_device *netdev = pci_get_drvdata(pdev);
2134         struct ixgb_adapter *adapter = netdev->priv;
2135
2136         netif_device_detach(netdev);
2137
2138         if(netif_running(netdev))
2139                 ixgb_down(adapter, TRUE);
2140
2141         pci_save_state(pdev);
2142
2143         state = (state > 0) ? 3 : 0;
2144         pci_set_power_state(pdev, state);
2145         msec_delay(200);
2146
2147         return 0;
2148 }
2149
2150 #ifdef CONFIG_NET_POLL_CONTROLLER
2151 /*
2152  * Polling 'interrupt' - used by things like netconsole to send skbs
2153  * without having to re-enable interrupts. It's not called while
2154  * the interrupt routine is executing.
2155  */
2156
2157 static void ixgb_netpoll(struct net_device *dev)
2158 {
2159         struct ixgb_adapter *adapter = dev->priv;
2160         disable_irq(adapter->pdev->irq);
2161         ixgb_intr(adapter->pdev->irq, dev, NULL);
2162         enable_irq(adapter->pdev->irq);
2163 }
2164 #endif
2165
2166 /* ixgb_main.c */