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

   1 /*******************************************************************************
   2
   3
   4   Copyright(c) 1999 - 2006 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 char ixgb_driver_name[] = "ixgb";
  32 static char ixgb_driver_string[] = "Intel(R) PRO/10GbE Network Driver";
  33
  34 #ifndef CONFIG_IXGB_NAPI
  35 #define DRIVERNAPI
  36 #else
  37 #define DRIVERNAPI "-NAPI"
  38 #endif
  39 #define DRV_VERSION             "1.0.109-k2"DRIVERNAPI
  40 char ixgb_driver_version[] = DRV_VERSION;
  41 static char ixgb_copyright[] = "Copyright (c) 1999-2006 Intel Corporation.";
  42
  43 /* ixgb_pci_tbl - PCI Device ID Table
  44  *
  45  * Wildcard entries (PCI_ANY_ID) should come last
  46  * Last entry must be all 0s
  47  *
  48  * { Vendor ID, Device ID, SubVendor ID, SubDevice ID,
  49  *   Class, Class Mask, private data (not used) }
  50  */
  51 static struct pci_device_id ixgb_pci_tbl[] = {
  52         {INTEL_VENDOR_ID, IXGB_DEVICE_ID_82597EX,
  53          PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
  54         {INTEL_VENDOR_ID, IXGB_DEVICE_ID_82597EX_CX4,
  55          PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
  56         {INTEL_VENDOR_ID, IXGB_DEVICE_ID_82597EX_SR,
  57          PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
  58         {INTEL_VENDOR_ID, IXGB_DEVICE_ID_82597EX_LR,
  59          PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
  60
  61         /* required last entry */
  62         {0,}
  63 };
  64
  65 MODULE_DEVICE_TABLE(pci, ixgb_pci_tbl);
  66
  67 /* Local Function Prototypes */
  68
  69 int ixgb_up(struct ixgb_adapter *adapter);
  70 void ixgb_down(struct ixgb_adapter *adapter, boolean_t kill_watchdog);
  71 void ixgb_reset(struct ixgb_adapter *adapter);
  72 int ixgb_setup_tx_resources(struct ixgb_adapter *adapter);
  73 int ixgb_setup_rx_resources(struct ixgb_adapter *adapter);
  74 void ixgb_free_tx_resources(struct ixgb_adapter *adapter);
  75 void ixgb_free_rx_resources(struct ixgb_adapter *adapter);
  76 void ixgb_update_stats(struct ixgb_adapter *adapter);
  77
  78 static int ixgb_init_module(void);
  79 static void ixgb_exit_module(void);
  80 static int ixgb_probe(struct pci_dev *pdev, const struct pci_device_id *ent);
  81 static void __devexit ixgb_remove(struct pci_dev *pdev);
  82 static int ixgb_sw_init(struct ixgb_adapter *adapter);
  83 static int ixgb_open(struct net_device *netdev);
  84 static int ixgb_close(struct net_device *netdev);
  85 static void ixgb_configure_tx(struct ixgb_adapter *adapter);
  86 static void ixgb_configure_rx(struct ixgb_adapter *adapter);
  87 static void ixgb_setup_rctl(struct ixgb_adapter *adapter);
  88 static void ixgb_clean_tx_ring(struct ixgb_adapter *adapter);
  89 static void ixgb_clean_rx_ring(struct ixgb_adapter *adapter);
  90 static void ixgb_set_multi(struct net_device *netdev);
  91 static void ixgb_watchdog(unsigned long data);
  92 static int ixgb_xmit_frame(struct sk_buff *skb, struct net_device *netdev);
  93 static struct net_device_stats *ixgb_get_stats(struct net_device *netdev);
  94 static int ixgb_change_mtu(struct net_device *netdev, int new_mtu);
  95 static int ixgb_set_mac(struct net_device *netdev, void *p);
  96 static irqreturn_t ixgb_intr(int irq, void *data, struct pt_regs *regs);
  97 static boolean_t ixgb_clean_tx_irq(struct ixgb_adapter *adapter);
  98
  99 #ifdef CONFIG_IXGB_NAPI
 100 static int ixgb_clean(struct net_device *netdev, int *budget);
 101 static boolean_t ixgb_clean_rx_irq(struct ixgb_adapter *adapter,
 102                                    int *work_done, int work_to_do);
 103 #else
 104 static boolean_t ixgb_clean_rx_irq(struct ixgb_adapter *adapter);
 105 #endif
 106 static void ixgb_alloc_rx_buffers(struct ixgb_adapter *adapter);
 107 void ixgb_set_ethtool_ops(struct net_device *netdev);
 108 static void ixgb_tx_timeout(struct net_device *dev);
 109 static void ixgb_tx_timeout_task(struct net_device *dev);
 110 static void ixgb_vlan_rx_register(struct net_device *netdev,
 111                                   struct vlan_group *grp);
 112 static void ixgb_vlan_rx_add_vid(struct net_device *netdev, uint16_t vid);
 113 static void ixgb_vlan_rx_kill_vid(struct net_device *netdev, uint16_t vid);
 114 static void ixgb_restore_vlan(struct ixgb_adapter *adapter);
 115
 116 #ifdef CONFIG_NET_POLL_CONTROLLER
 117 /* for netdump / net console */
 118 static void ixgb_netpoll(struct net_device *dev);
 119 #endif
 120
 121 /* Exported from other modules */
 122
 123 extern void ixgb_check_options(struct ixgb_adapter *adapter);
 124
 125 static struct pci_driver ixgb_driver = {
 126         .name     = ixgb_driver_name,
 127         .id_table = ixgb_pci_tbl,
 128         .probe    = ixgb_probe,
 129         .remove   = __devexit_p(ixgb_remove),
 130 };
 131
 132 MODULE_AUTHOR("Intel Corporation, <linux.nics@intel.com>");
 133 MODULE_DESCRIPTION("Intel(R) PRO/10GbE Network Driver");
 134 MODULE_LICENSE("GPL");
 135 MODULE_VERSION(DRV_VERSION);
 136
 137 #define DEFAULT_DEBUG_LEVEL_SHIFT 3
 138 static int debug = DEFAULT_DEBUG_LEVEL_SHIFT;
 139 module_param(debug, int, 0);
 140 MODULE_PARM_DESC(debug, "Debug level (0=none,...,16=all)");
 141
 142 /* some defines for controlling descriptor fetches in h/w */
 143 #define RXDCTL_WTHRESH_DEFAULT 16       /* chip writes back at this many or RXT0 */
 144 #define RXDCTL_PTHRESH_DEFAULT 0                /* chip considers prefech below
 145                                                  * this */
 146 #define RXDCTL_HTHRESH_DEFAULT 0                /* chip will only prefetch if tail
 147                                                  * is pushed this many descriptors
 148                                                  * from head */
 149
 150 /**
 151  * ixgb_init_module - Driver Registration Routine
 152  *
 153  * ixgb_init_module is the first routine called when the driver is
 154  * loaded. All it does is register with the PCI subsystem.
 155  **/
 156
 157 static int __init
 158 ixgb_init_module(void)
 159 {
 160         printk(KERN_INFO "%s - version %s\n",
 161                ixgb_driver_string, ixgb_driver_version);
 162
 163         printk(KERN_INFO "%s\n", ixgb_copyright);
 164
 165         return pci_module_init(&ixgb_driver);
 166 }
 167
 168 module_init(ixgb_init_module);
 169
 170 /**
 171  * ixgb_exit_module - Driver Exit Cleanup Routine
 172  *
 173  * ixgb_exit_module is called just before the driver is removed
 174  * from memory.
 175  **/
 176
 177 static void __exit
 178 ixgb_exit_module(void)
 179 {
 180         pci_unregister_driver(&ixgb_driver);
 181 }
 182
 183 module_exit(ixgb_exit_module);
 184
 185 /**
 186  * ixgb_irq_disable - Mask off interrupt generation on the NIC
 187  * @adapter: board private structure
 188  **/
 189
 190 static void
 191 ixgb_irq_disable(struct ixgb_adapter *adapter)
 192 {
 193         atomic_inc(&adapter->irq_sem);
 194         IXGB_WRITE_REG(&adapter->hw, IMC, ~0);
 195         IXGB_WRITE_FLUSH(&adapter->hw);
 196         synchronize_irq(adapter->pdev->irq);
 197 }
 198
 199 /**
 200  * ixgb_irq_enable - Enable default interrupt generation settings
 201  * @adapter: board private structure
 202  **/
 203
 204 static void
 205 ixgb_irq_enable(struct ixgb_adapter *adapter)
 206 {
 207         if(atomic_dec_and_test(&adapter->irq_sem)) {
 208                 IXGB_WRITE_REG(&adapter->hw, IMS,
 209                                IXGB_INT_RXT0 | IXGB_INT_RXDMT0 | IXGB_INT_TXDW |
 210                                IXGB_INT_LSC);
 211                 IXGB_WRITE_FLUSH(&adapter->hw);
 212         }
 213 }
 214
 215 int
 216 ixgb_up(struct ixgb_adapter *adapter)
 217 {
 218         struct net_device *netdev = adapter->netdev;
 219         int err;
 220         int max_frame = netdev->mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;
 221         struct ixgb_hw *hw = &adapter->hw;
 222
 223         /* hardware has been reset, we need to reload some things */
 224
 225         ixgb_rar_set(hw, netdev->dev_addr, 0);
 226         ixgb_set_multi(netdev);
 227
 228         ixgb_restore_vlan(adapter);
 229
 230         ixgb_configure_tx(adapter);
 231         ixgb_setup_rctl(adapter);
 232         ixgb_configure_rx(adapter);
 233         ixgb_alloc_rx_buffers(adapter);
 234
 235         /* disable interrupts and get the hardware into a known state */
 236         IXGB_WRITE_REG(&adapter->hw, IMC, 0xffffffff);
 237
 238 #ifdef CONFIG_PCI_MSI
 239         {
 240         boolean_t pcix = (IXGB_READ_REG(&adapter->hw, STATUS) &
 241                                                   IXGB_STATUS_PCIX_MODE) ? TRUE : FALSE;
 242         adapter->have_msi = TRUE;
 243
 244         if (!pcix)
 245            adapter->have_msi = FALSE;
 246         else if((err = pci_enable_msi(adapter->pdev))) {
 247                 DPRINTK(PROBE, ERR,
 248                  "Unable to allocate MSI interrupt Error: %d\n", err);
 249                 adapter->have_msi = FALSE;
 250                 /* proceed to try to request regular interrupt */
 251         }
 252         }
 253
 254 #endif
 255         if((err = request_irq(adapter->pdev->irq, &ixgb_intr,
 256                                   IRQF_SHARED | IRQF_SAMPLE_RANDOM,
 257                                   netdev->name, netdev))) {
 258                 DPRINTK(PROBE, ERR,
 259                  "Unable to allocate interrupt Error: %d\n", err);
 260                 return err;
 261         }
 262
 263         if((hw->max_frame_size != max_frame) ||
 264                 (hw->max_frame_size !=
 265                 (IXGB_READ_REG(hw, MFS) >> IXGB_MFS_SHIFT))) {
 266
 267                 hw->max_frame_size = max_frame;
 268
 269                 IXGB_WRITE_REG(hw, MFS, hw->max_frame_size << IXGB_MFS_SHIFT);
 270
 271                 if(hw->max_frame_size >
 272                    IXGB_MAX_ENET_FRAME_SIZE_WITHOUT_FCS + ENET_FCS_LENGTH) {
 273                         uint32_t ctrl0 = IXGB_READ_REG(hw, CTRL0);
 274
 275                         if(!(ctrl0 & IXGB_CTRL0_JFE)) {
 276                                 ctrl0 |= IXGB_CTRL0_JFE;
 277                                 IXGB_WRITE_REG(hw, CTRL0, ctrl0);
 278                         }
 279                 }
 280         }
 281
 282         mod_timer(&adapter->watchdog_timer, jiffies);
 283
 284 #ifdef CONFIG_IXGB_NAPI
 285         netif_poll_enable(netdev);
 286 #endif
 287         ixgb_irq_enable(adapter);
 288
 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                 DPRINTK(PROBE, ERR, "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            !(err = pci_set_consistent_dma_mask(pdev, DMA_64BIT_MASK))) {
 358                 pci_using_dac = 1;
 359         } else {
 360                 if((err = pci_set_dma_mask(pdev, DMA_32BIT_MASK)) ||
 361                    (err = pci_set_consistent_dma_mask(pdev, DMA_32BIT_MASK))) {
 362                         printk(KERN_ERR
 363                          "ixgb: No usable DMA configuration, aborting\n");
 364                         goto err_dma_mask;
 365                 }
 366                 pci_using_dac = 0;
 367         }
 368
 369         if((err = pci_request_regions(pdev, ixgb_driver_name)))
 370                 goto err_request_regions;
 371
 372         pci_set_master(pdev);
 373
 374         netdev = alloc_etherdev(sizeof(struct ixgb_adapter));
 375         if(!netdev) {
 376                 err = -ENOMEM;
 377                 goto err_alloc_etherdev;
 378         }
 379
 380         SET_MODULE_OWNER(netdev);
 381         SET_NETDEV_DEV(netdev, &pdev->dev);
 382
 383         pci_set_drvdata(pdev, netdev);
 384         adapter = netdev_priv(netdev);
 385         adapter->netdev = netdev;
 386         adapter->pdev = pdev;
 387         adapter->hw.back = adapter;
 388         adapter->msg_enable = netif_msg_init(debug, DEFAULT_DEBUG_LEVEL_SHIFT);
 389
 390         mmio_start = pci_resource_start(pdev, BAR_0);
 391         mmio_len = pci_resource_len(pdev, BAR_0);
 392
 393         adapter->hw.hw_addr = ioremap(mmio_start, mmio_len);
 394         if(!adapter->hw.hw_addr) {
 395                 err = -EIO;
 396                 goto err_ioremap;
 397         }
 398
 399         for(i = BAR_1; i <= BAR_5; i++) {
 400                 if(pci_resource_len(pdev, i) == 0)
 401                         continue;
 402                 if(pci_resource_flags(pdev, i) & IORESOURCE_IO) {
 403                         adapter->hw.io_base = pci_resource_start(pdev, i);
 404                         break;
 405                 }
 406         }
 407
 408         netdev->open = &ixgb_open;
 409         netdev->stop = &ixgb_close;
 410         netdev->hard_start_xmit = &ixgb_xmit_frame;
 411         netdev->get_stats = &ixgb_get_stats;
 412         netdev->set_multicast_list = &ixgb_set_multi;
 413         netdev->set_mac_address = &ixgb_set_mac;
 414         netdev->change_mtu = &ixgb_change_mtu;
 415         ixgb_set_ethtool_ops(netdev);
 416         netdev->tx_timeout = &ixgb_tx_timeout;
 417         netdev->watchdog_timeo = 5 * HZ;
 418 #ifdef CONFIG_IXGB_NAPI
 419         netdev->poll = &ixgb_clean;
 420         netdev->weight = 64;
 421 #endif
 422         netdev->vlan_rx_register = ixgb_vlan_rx_register;
 423         netdev->vlan_rx_add_vid = ixgb_vlan_rx_add_vid;
 424         netdev->vlan_rx_kill_vid = ixgb_vlan_rx_kill_vid;
 425 #ifdef CONFIG_NET_POLL_CONTROLLER
 426         netdev->poll_controller = ixgb_netpoll;
 427 #endif
 428
 429         strcpy(netdev->name, pci_name(pdev));
 430         netdev->mem_start = mmio_start;
 431         netdev->mem_end = mmio_start + mmio_len;
 432         netdev->base_addr = adapter->hw.io_base;
 433
 434         adapter->bd_number = cards_found;
 435         adapter->link_speed = 0;
 436         adapter->link_duplex = 0;
 437
 438         /* setup the private structure */
 439
 440         if((err = ixgb_sw_init(adapter)))
 441                 goto err_sw_init;
 442
 443         netdev->features = NETIF_F_SG |
 444                            NETIF_F_HW_CSUM |
 445                            NETIF_F_HW_VLAN_TX |
 446                            NETIF_F_HW_VLAN_RX |
 447                            NETIF_F_HW_VLAN_FILTER;
 448 #ifdef NETIF_F_TSO
 449         netdev->features |= NETIF_F_TSO;
 450 #endif
 451 #ifdef NETIF_F_LLTX
 452         netdev->features |= NETIF_F_LLTX;
 453 #endif
 454
 455         if(pci_using_dac)
 456                 netdev->features |= NETIF_F_HIGHDMA;
 457
 458         /* make sure the EEPROM is good */
 459
 460         if(!ixgb_validate_eeprom_checksum(&adapter->hw)) {
 461                 DPRINTK(PROBE, ERR, "The EEPROM Checksum Is Not Valid\n");
 462                 err = -EIO;
 463                 goto err_eeprom;
 464         }
 465
 466         ixgb_get_ee_mac_addr(&adapter->hw, netdev->dev_addr);
 467         memcpy(netdev->perm_addr, netdev->dev_addr, netdev->addr_len);
 468
 469         if(!is_valid_ether_addr(netdev->perm_addr)) {
 470                 DPRINTK(PROBE, ERR, "Invalid MAC Address\n");
 471                 err = -EIO;
 472                 goto err_eeprom;
 473         }
 474
 475         adapter->part_num = ixgb_get_ee_pba_number(&adapter->hw);
 476
 477         init_timer(&adapter->watchdog_timer);
 478         adapter->watchdog_timer.function = &ixgb_watchdog;
 479         adapter->watchdog_timer.data = (unsigned long)adapter;
 480
 481         INIT_WORK(&adapter->tx_timeout_task,
 482                   (void (*)(void *))ixgb_tx_timeout_task, netdev);
 483
 484         strcpy(netdev->name, "eth%d");
 485         if((err = register_netdev(netdev)))
 486                 goto err_register;
 487
 488         /* we're going to reset, so assume we have no link for now */
 489
 490         netif_carrier_off(netdev);
 491         netif_stop_queue(netdev);
 492
 493         DPRINTK(PROBE, INFO, "Intel(R) PRO/10GbE Network Connection\n");
 494         ixgb_check_options(adapter);
 495         /* reset the hardware with the new settings */
 496
 497         ixgb_reset(adapter);
 498
 499         cards_found++;
 500         return 0;
 501
 502 err_register:
 503 err_sw_init:
 504 err_eeprom:
 505         iounmap(adapter->hw.hw_addr);
 506 err_ioremap:
 507         free_netdev(netdev);
 508 err_alloc_etherdev:
 509         pci_release_regions(pdev);
 510 err_request_regions:
 511 err_dma_mask:
 512         pci_disable_device(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(netdev);
 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         hw->max_frame_size = netdev->mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;
 564         adapter->rx_buffer_len = hw->max_frame_size;
 565
 566         if((hw->device_id == IXGB_DEVICE_ID_82597EX)
 567            || (hw->device_id == IXGB_DEVICE_ID_82597EX_CX4)
 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                 DPRINTK(PROBE, ERR, "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(netdev);
 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(netdev);
 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                 DPRINTK(PROBE, ERR,
 672                  "Unable to allocate transmit descriptor ring memory\n");
 673                 return -ENOMEM;
 674         }
 675         memset(txdr->buffer_info, 0, size);
 676
 677         /* round up to nearest 4K */
 678
 679         txdr->size = txdr->count * sizeof(struct ixgb_tx_desc);
 680         IXGB_ROUNDUP(txdr->size, 4096);
 681
 682         txdr->desc = pci_alloc_consistent(pdev, txdr->size, &txdr->dma);
 683         if(!txdr->desc) {
 684                 vfree(txdr->buffer_info);
 685                 DPRINTK(PROBE, ERR,
 686                  "Unable to allocate transmit descriptor memory\n");
 687                 return -ENOMEM;
 688         }
 689         memset(txdr->desc, 0, txdr->size);
 690
 691         txdr->next_to_use = 0;
 692         txdr->next_to_clean = 0;
 693
 694         return 0;
 695 }
 696
 697 /**
 698  * ixgb_configure_tx - Configure 82597 Transmit Unit after Reset.
 699  * @adapter: board private structure
 700  *
 701  * Configure the Tx unit of the MAC after a reset.
 702  **/
 703
 704 static void
 705 ixgb_configure_tx(struct ixgb_adapter *adapter)
 706 {
 707         uint64_t tdba = adapter->tx_ring.dma;
 708         uint32_t tdlen = adapter->tx_ring.count * sizeof(struct ixgb_tx_desc);
 709         uint32_t tctl;
 710         struct ixgb_hw *hw = &adapter->hw;
 711
 712         /* Setup the Base and Length of the Tx Descriptor Ring
 713          * tx_ring.dma can be either a 32 or 64 bit value
 714          */
 715
 716         IXGB_WRITE_REG(hw, TDBAL, (tdba & 0x00000000ffffffffULL));
 717         IXGB_WRITE_REG(hw, TDBAH, (tdba >> 32));
 718
 719         IXGB_WRITE_REG(hw, TDLEN, tdlen);
 720
 721         /* Setup the HW Tx Head and Tail descriptor pointers */
 722
 723         IXGB_WRITE_REG(hw, TDH, 0);
 724         IXGB_WRITE_REG(hw, TDT, 0);
 725
 726         /* don't set up txdctl, it induces performance problems if configured
 727          * incorrectly */
 728         /* Set the Tx Interrupt Delay register */
 729
 730         IXGB_WRITE_REG(hw, TIDV, adapter->tx_int_delay);
 731
 732         /* Program the Transmit Control Register */
 733
 734         tctl = IXGB_TCTL_TCE | IXGB_TCTL_TXEN | IXGB_TCTL_TPDE;
 735         IXGB_WRITE_REG(hw, TCTL, tctl);
 736
 737         /* Setup Transmit Descriptor Settings for this adapter */
 738         adapter->tx_cmd_type =
 739                 IXGB_TX_DESC_TYPE
 740                 | (adapter->tx_int_delay_enable ? IXGB_TX_DESC_CMD_IDE : 0);
 741 }
 742
 743 /**
 744  * ixgb_setup_rx_resources - allocate Rx resources (Descriptors)
 745  * @adapter: board private structure
 746  *
 747  * Returns 0 on success, negative on failure
 748  **/
 749
 750 int
 751 ixgb_setup_rx_resources(struct ixgb_adapter *adapter)
 752 {
 753         struct ixgb_desc_ring *rxdr = &adapter->rx_ring;
 754         struct pci_dev *pdev = adapter->pdev;
 755         int size;
 756
 757         size = sizeof(struct ixgb_buffer) * rxdr->count;
 758         rxdr->buffer_info = vmalloc(size);
 759         if(!rxdr->buffer_info) {
 760                 DPRINTK(PROBE, ERR,
 761                  "Unable to allocate receive descriptor ring\n");
 762                 return -ENOMEM;
 763         }
 764         memset(rxdr->buffer_info, 0, size);
 765
 766         /* Round up to nearest 4K */
 767
 768         rxdr->size = rxdr->count * sizeof(struct ixgb_rx_desc);
 769         IXGB_ROUNDUP(rxdr->size, 4096);
 770
 771         rxdr->desc = pci_alloc_consistent(pdev, rxdr->size, &rxdr->dma);
 772
 773         if(!rxdr->desc) {
 774                 vfree(rxdr->buffer_info);
 775                 DPRINTK(PROBE, ERR,
 776                  "Unable to allocate receive descriptors\n");
 777                 return -ENOMEM;
 778         }
 779         memset(rxdr->desc, 0, rxdr->size);
 780
 781         rxdr->next_to_clean = 0;
 782         rxdr->next_to_use = 0;
 783
 784         return 0;
 785 }
 786
 787 /**
 788  * ixgb_setup_rctl - configure the receive control register
 789  * @adapter: Board private structure
 790  **/
 791
 792 static void
 793 ixgb_setup_rctl(struct ixgb_adapter *adapter)
 794 {
 795         uint32_t rctl;
 796
 797         rctl = IXGB_READ_REG(&adapter->hw, RCTL);
 798
 799         rctl &= ~(3 << IXGB_RCTL_MO_SHIFT);
 800
 801         rctl |=
 802                 IXGB_RCTL_BAM | IXGB_RCTL_RDMTS_1_2 |
 803                 IXGB_RCTL_RXEN | IXGB_RCTL_CFF |
 804                 (adapter->hw.mc_filter_type << IXGB_RCTL_MO_SHIFT);
 805
 806         rctl |= IXGB_RCTL_SECRC;
 807
 808         if (adapter->rx_buffer_len <= IXGB_RXBUFFER_2048)
 809                 rctl |= IXGB_RCTL_BSIZE_2048;
 810         else if (adapter->rx_buffer_len <= IXGB_RXBUFFER_4096)
 811                 rctl |= IXGB_RCTL_BSIZE_4096;
 812         else if (adapter->rx_buffer_len <= IXGB_RXBUFFER_8192)
 813                 rctl |= IXGB_RCTL_BSIZE_8192;
 814         else if (adapter->rx_buffer_len <= IXGB_RXBUFFER_16384)
 815                 rctl |= IXGB_RCTL_BSIZE_16384;
 816
 817         IXGB_WRITE_REG(&adapter->hw, RCTL, rctl);
 818 }
 819
 820 /**
 821  * ixgb_configure_rx - Configure 82597 Receive Unit after Reset.
 822  * @adapter: board private structure
 823  *
 824  * Configure the Rx unit of the MAC after a reset.
 825  **/
 826
 827 static void
 828 ixgb_configure_rx(struct ixgb_adapter *adapter)
 829 {
 830         uint64_t rdba = adapter->rx_ring.dma;
 831         uint32_t rdlen = adapter->rx_ring.count * sizeof(struct ixgb_rx_desc);
 832         struct ixgb_hw *hw = &adapter->hw;
 833         uint32_t rctl;
 834         uint32_t rxcsum;
 835         uint32_t rxdctl;
 836
 837         /* make sure receives are disabled while setting up the descriptors */
 838
 839         rctl = IXGB_READ_REG(hw, RCTL);
 840         IXGB_WRITE_REG(hw, RCTL, rctl & ~IXGB_RCTL_RXEN);
 841
 842         /* set the Receive Delay Timer Register */
 843
 844         IXGB_WRITE_REG(hw, RDTR, adapter->rx_int_delay);
 845
 846         /* Setup the Base and Length of the Rx Descriptor Ring */
 847
 848         IXGB_WRITE_REG(hw, RDBAL, (rdba & 0x00000000ffffffffULL));
 849         IXGB_WRITE_REG(hw, RDBAH, (rdba >> 32));
 850
 851         IXGB_WRITE_REG(hw, RDLEN, rdlen);
 852
 853         /* Setup the HW Rx Head and Tail Descriptor Pointers */
 854         IXGB_WRITE_REG(hw, RDH, 0);
 855         IXGB_WRITE_REG(hw, RDT, 0);
 856
 857         /* set up pre-fetching of receive buffers so we get some before we
 858          * run out (default hardware behavior is to run out before fetching
 859          * more).  This sets up to fetch if HTHRESH rx descriptors are avail
 860          * and the descriptors in hw cache are below PTHRESH.  This avoids
 861          * the hardware behavior of fetching <=512 descriptors in a single
 862          * burst that pre-empts all other activity, usually causing fifo
 863          * overflows. */
 864         /* use WTHRESH to burst write 16 descriptors or burst when RXT0 */
 865         rxdctl = RXDCTL_WTHRESH_DEFAULT << IXGB_RXDCTL_WTHRESH_SHIFT |
 866                  RXDCTL_HTHRESH_DEFAULT << IXGB_RXDCTL_HTHRESH_SHIFT |
 867                  RXDCTL_PTHRESH_DEFAULT << IXGB_RXDCTL_PTHRESH_SHIFT;
 868         IXGB_WRITE_REG(hw, RXDCTL, rxdctl);
 869
 870         /* Enable Receive Checksum Offload for TCP and UDP */
 871         if(adapter->rx_csum == TRUE) {
 872                 rxcsum = IXGB_READ_REG(hw, RXCSUM);
 873                 rxcsum |= IXGB_RXCSUM_TUOFL;
 874                 IXGB_WRITE_REG(hw, RXCSUM, rxcsum);
 875         }
 876
 877         /* Enable Receives */
 878
 879         IXGB_WRITE_REG(hw, RCTL, rctl);
 880 }
 881
 882 /**
 883  * ixgb_free_tx_resources - Free Tx Resources
 884  * @adapter: board private structure
 885  *
 886  * Free all transmit software resources
 887  **/
 888
 889 void
 890 ixgb_free_tx_resources(struct ixgb_adapter *adapter)
 891 {
 892         struct pci_dev *pdev = adapter->pdev;
 893
 894         ixgb_clean_tx_ring(adapter);
 895
 896         vfree(adapter->tx_ring.buffer_info);
 897         adapter->tx_ring.buffer_info = NULL;
 898
 899         pci_free_consistent(pdev, adapter->tx_ring.size,
 900                             adapter->tx_ring.desc, adapter->tx_ring.dma);
 901
 902         adapter->tx_ring.desc = NULL;
 903 }
 904
 905 static void
 906 ixgb_unmap_and_free_tx_resource(struct ixgb_adapter *adapter,
 907                                         struct ixgb_buffer *buffer_info)
 908 {
 909         struct pci_dev *pdev = adapter->pdev;
 910
 911         if (buffer_info->dma)
 912                 pci_unmap_page(pdev, buffer_info->dma, buffer_info->length,
 913                                PCI_DMA_TODEVICE);
 914
 915         if (buffer_info->skb)
 916                 dev_kfree_skb_any(buffer_info->skb);
 917
 918         buffer_info->skb = NULL;
 919         buffer_info->dma = 0;
 920         buffer_info->time_stamp = 0;
 921         /* these fields must always be initialized in tx
 922          * buffer_info->length = 0;
 923          * buffer_info->next_to_watch = 0; */
 924 }
 925
 926 /**
 927  * ixgb_clean_tx_ring - Free Tx Buffers
 928  * @adapter: board private structure
 929  **/
 930
 931 static void
 932 ixgb_clean_tx_ring(struct ixgb_adapter *adapter)
 933 {
 934         struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
 935         struct ixgb_buffer *buffer_info;
 936         unsigned long size;
 937         unsigned int i;
 938
 939         /* Free all the Tx ring sk_buffs */
 940
 941         for(i = 0; i < tx_ring->count; i++) {
 942                 buffer_info = &tx_ring->buffer_info[i];
 943                 ixgb_unmap_and_free_tx_resource(adapter, buffer_info);
 944         }
 945
 946         size = sizeof(struct ixgb_buffer) * tx_ring->count;
 947         memset(tx_ring->buffer_info, 0, size);
 948
 949         /* Zero out the descriptor ring */
 950
 951         memset(tx_ring->desc, 0, tx_ring->size);
 952
 953         tx_ring->next_to_use = 0;
 954         tx_ring->next_to_clean = 0;
 955
 956         IXGB_WRITE_REG(&adapter->hw, TDH, 0);
 957         IXGB_WRITE_REG(&adapter->hw, TDT, 0);
 958 }
 959
 960 /**
 961  * ixgb_free_rx_resources - Free Rx Resources
 962  * @adapter: board private structure
 963  *
 964  * Free all receive software resources
 965  **/
 966
 967 void
 968 ixgb_free_rx_resources(struct ixgb_adapter *adapter)
 969 {
 970         struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
 971         struct pci_dev *pdev = adapter->pdev;
 972
 973         ixgb_clean_rx_ring(adapter);
 974
 975         vfree(rx_ring->buffer_info);
 976         rx_ring->buffer_info = NULL;
 977
 978         pci_free_consistent(pdev, rx_ring->size, rx_ring->desc, rx_ring->dma);
 979
 980         rx_ring->desc = NULL;
 981 }
 982
 983 /**
 984  * ixgb_clean_rx_ring - Free Rx Buffers
 985  * @adapter: board private structure
 986  **/
 987
 988 static void
 989 ixgb_clean_rx_ring(struct ixgb_adapter *adapter)
 990 {
 991         struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
 992         struct ixgb_buffer *buffer_info;
 993         struct pci_dev *pdev = adapter->pdev;
 994         unsigned long size;
 995         unsigned int i;
 996
 997         /* Free all the Rx ring sk_buffs */
 998
 999         for(i = 0; i < rx_ring->count; i++) {
1000                 buffer_info = &rx_ring->buffer_info[i];
1001                 if(buffer_info->skb) {
1002
1003                         pci_unmap_single(pdev,
1004                                          buffer_info->dma,
1005                                          buffer_info->length,
1006                                          PCI_DMA_FROMDEVICE);
1007
1008                         dev_kfree_skb(buffer_info->skb);
1009
1010                         buffer_info->skb = NULL;
1011                 }
1012         }
1013
1014         size = sizeof(struct ixgb_buffer) * rx_ring->count;
1015         memset(rx_ring->buffer_info, 0, size);
1016
1017         /* Zero out the descriptor ring */
1018
1019         memset(rx_ring->desc, 0, rx_ring->size);
1020
1021         rx_ring->next_to_clean = 0;
1022         rx_ring->next_to_use = 0;
1023
1024         IXGB_WRITE_REG(&adapter->hw, RDH, 0);
1025         IXGB_WRITE_REG(&adapter->hw, RDT, 0);
1026 }
1027
1028 /**
1029  * ixgb_set_mac - Change the Ethernet Address of the NIC
1030  * @netdev: network interface device structure
1031  * @p: pointer to an address structure
1032  *
1033  * Returns 0 on success, negative on failure
1034  **/
1035
1036 static int
1037 ixgb_set_mac(struct net_device *netdev, void *p)
1038 {
1039         struct ixgb_adapter *adapter = netdev_priv(netdev);
1040         struct sockaddr *addr = p;
1041
1042         if(!is_valid_ether_addr(addr->sa_data))
1043                 return -EADDRNOTAVAIL;
1044
1045         memcpy(netdev->dev_addr, addr->sa_data, netdev->addr_len);
1046
1047         ixgb_rar_set(&adapter->hw, addr->sa_data, 0);
1048
1049         return 0;
1050 }
1051
1052 /**
1053  * ixgb_set_multi - Multicast and Promiscuous mode set
1054  * @netdev: network interface device structure
1055  *
1056  * The set_multi entry point is called whenever the multicast address
1057  * list or the network interface flags are updated.  This routine is
1058  * responsible for configuring the hardware for proper multicast,
1059  * promiscuous mode, and all-multi behavior.
1060  **/
1061
1062 static void
1063 ixgb_set_multi(struct net_device *netdev)
1064 {
1065         struct ixgb_adapter *adapter = netdev_priv(netdev);
1066         struct ixgb_hw *hw = &adapter->hw;
1067         struct dev_mc_list *mc_ptr;
1068         uint32_t rctl;
1069         int i;
1070
1071         /* Check for Promiscuous and All Multicast modes */
1072
1073         rctl = IXGB_READ_REG(hw, RCTL);
1074
1075         if(netdev->flags & IFF_PROMISC) {
1076                 rctl |= (IXGB_RCTL_UPE | IXGB_RCTL_MPE);
1077         } else if(netdev->flags & IFF_ALLMULTI) {
1078                 rctl |= IXGB_RCTL_MPE;
1079                 rctl &= ~IXGB_RCTL_UPE;
1080         } else {
1081                 rctl &= ~(IXGB_RCTL_UPE | IXGB_RCTL_MPE);
1082         }
1083
1084         if(netdev->mc_count > IXGB_MAX_NUM_MULTICAST_ADDRESSES) {
1085                 rctl |= IXGB_RCTL_MPE;
1086                 IXGB_WRITE_REG(hw, RCTL, rctl);
1087         } else {
1088                 uint8_t mta[netdev->mc_count * IXGB_ETH_LENGTH_OF_ADDRESS];
1089
1090                 IXGB_WRITE_REG(hw, RCTL, rctl);
1091
1092                 for(i = 0, mc_ptr = netdev->mc_list; mc_ptr;
1093                         i++, mc_ptr = mc_ptr->next)
1094                         memcpy(&mta[i * IXGB_ETH_LENGTH_OF_ADDRESS],
1095                                    mc_ptr->dmi_addr, IXGB_ETH_LENGTH_OF_ADDRESS);
1096
1097                 ixgb_mc_addr_list_update(hw, mta, netdev->mc_count, 0);
1098         }
1099 }
1100
1101 /**
1102  * ixgb_watchdog - Timer Call-back
1103  * @data: pointer to netdev cast into an unsigned long
1104  **/
1105
1106 static void
1107 ixgb_watchdog(unsigned long data)
1108 {
1109         struct ixgb_adapter *adapter = (struct ixgb_adapter *)data;
1110         struct net_device *netdev = adapter->netdev;
1111         struct ixgb_desc_ring *txdr = &adapter->tx_ring;
1112
1113         ixgb_check_for_link(&adapter->hw);
1114
1115         if (ixgb_check_for_bad_link(&adapter->hw)) {
1116                 /* force the reset path */
1117                 netif_stop_queue(netdev);
1118         }
1119
1120         if(adapter->hw.link_up) {
1121                 if(!netif_carrier_ok(netdev)) {
1122                         DPRINTK(LINK, INFO,
1123                                 "NIC Link is Up 10000 Mbps Full Duplex\n");
1124                         adapter->link_speed = 10000;
1125                         adapter->link_duplex = FULL_DUPLEX;
1126                         netif_carrier_on(netdev);
1127                         netif_wake_queue(netdev);
1128                 }
1129         } else {
1130                 if(netif_carrier_ok(netdev)) {
1131                         adapter->link_speed = 0;
1132                         adapter->link_duplex = 0;
1133                         DPRINTK(LINK, INFO, "NIC Link is Down\n");
1134                         netif_carrier_off(netdev);
1135                         netif_stop_queue(netdev);
1136
1137                 }
1138         }
1139
1140         ixgb_update_stats(adapter);
1141
1142         if(!netif_carrier_ok(netdev)) {
1143                 if(IXGB_DESC_UNUSED(txdr) + 1 < txdr->count) {
1144                         /* We've lost link, so the controller stops DMA,
1145                          * but we've got queued Tx work that's never going
1146                          * to get done, so reset controller to flush Tx.
1147                          * (Do the reset outside of interrupt context). */
1148                         schedule_work(&adapter->tx_timeout_task);
1149                 }
1150         }
1151
1152         /* Force detection of hung controller every watchdog period */
1153         adapter->detect_tx_hung = TRUE;
1154
1155         /* generate an interrupt to force clean up of any stragglers */
1156         IXGB_WRITE_REG(&adapter->hw, ICS, IXGB_INT_TXDW);
1157
1158         /* Reset the timer */
1159         mod_timer(&adapter->watchdog_timer, jiffies + 2 * HZ);
1160 }
1161
1162 #define IXGB_TX_FLAGS_CSUM              0x00000001
1163 #define IXGB_TX_FLAGS_VLAN              0x00000002
1164 #define IXGB_TX_FLAGS_TSO               0x00000004
1165
1166 static int
1167 ixgb_tso(struct ixgb_adapter *adapter, struct sk_buff *skb)
1168 {
1169 #ifdef NETIF_F_TSO
1170         struct ixgb_context_desc *context_desc;
1171         unsigned int i;
1172         uint8_t ipcss, ipcso, tucss, tucso, hdr_len;
1173         uint16_t ipcse, tucse, mss;
1174         int err;
1175
1176         if(likely(skb_shinfo(skb)->gso_size)) {
1177                 if (skb_header_cloned(skb)) {
1178                         err = pskb_expand_head(skb, 0, 0, GFP_ATOMIC);
1179                         if (err)
1180                                 return err;
1181                 }
1182
1183                 hdr_len = ((skb->h.raw - skb->data) + (skb->h.th->doff << 2));
1184                 mss = skb_shinfo(skb)->gso_size;
1185                 skb->nh.iph->tot_len = 0;
1186                 skb->nh.iph->check = 0;
1187                 skb->h.th->check = ~csum_tcpudp_magic(skb->nh.iph->saddr,
1188                                                       skb->nh.iph->daddr,
1189                                                       0, IPPROTO_TCP, 0);
1190                 ipcss = skb->nh.raw - skb->data;
1191                 ipcso = (void *)&(skb->nh.iph->check) - (void *)skb->data;
1192                 ipcse = skb->h.raw - skb->data - 1;
1193                 tucss = skb->h.raw - skb->data;
1194                 tucso = (void *)&(skb->h.th->check) - (void *)skb->data;
1195                 tucse = 0;
1196
1197                 i = adapter->tx_ring.next_to_use;
1198                 context_desc = IXGB_CONTEXT_DESC(adapter->tx_ring, i);
1199
1200                 context_desc->ipcss = ipcss;
1201                 context_desc->ipcso = ipcso;
1202                 context_desc->ipcse = cpu_to_le16(ipcse);
1203                 context_desc->tucss = tucss;
1204                 context_desc->tucso = tucso;
1205                 context_desc->tucse = cpu_to_le16(tucse);
1206                 context_desc->mss = cpu_to_le16(mss);
1207                 context_desc->hdr_len = hdr_len;
1208                 context_desc->status = 0;
1209                 context_desc->cmd_type_len = cpu_to_le32(
1210                                                   IXGB_CONTEXT_DESC_TYPE
1211                                                 | IXGB_CONTEXT_DESC_CMD_TSE
1212                                                 | IXGB_CONTEXT_DESC_CMD_IP
1213                                                 | IXGB_CONTEXT_DESC_CMD_TCP
1214                                                 | IXGB_CONTEXT_DESC_CMD_IDE
1215                                                 | (skb->len - (hdr_len)));
1216
1217
1218                 if(++i == adapter->tx_ring.count) i = 0;
1219                 adapter->tx_ring.next_to_use = i;
1220
1221                 return 1;
1222         }
1223 #endif
1224
1225         return 0;
1226 }
1227
1228 static boolean_t
1229 ixgb_tx_csum(struct ixgb_adapter *adapter, struct sk_buff *skb)
1230 {
1231         struct ixgb_context_desc *context_desc;
1232         unsigned int i;
1233         uint8_t css, cso;
1234
1235         if(likely(skb->ip_summed == CHECKSUM_HW)) {
1236                 css = skb->h.raw - skb->data;
1237                 cso = (skb->h.raw + skb->csum) - skb->data;
1238
1239                 i = adapter->tx_ring.next_to_use;
1240                 context_desc = IXGB_CONTEXT_DESC(adapter->tx_ring, i);
1241
1242                 context_desc->tucss = css;
1243                 context_desc->tucso = cso;
1244                 context_desc->tucse = 0;
1245                 /* zero out any previously existing data in one instruction */
1246                 *(uint32_t *)&(context_desc->ipcss) = 0;
1247                 context_desc->status = 0;
1248                 context_desc->hdr_len = 0;
1249                 context_desc->mss = 0;
1250                 context_desc->cmd_type_len =
1251                         cpu_to_le32(IXGB_CONTEXT_DESC_TYPE
1252                                     | IXGB_TX_DESC_CMD_IDE);
1253
1254                 if(++i == adapter->tx_ring.count) i = 0;
1255                 adapter->tx_ring.next_to_use = i;
1256
1257                 return TRUE;
1258         }
1259
1260         return FALSE;
1261 }
1262
1263 #define IXGB_MAX_TXD_PWR        14
1264 #define IXGB_MAX_DATA_PER_TXD   (1<<IXGB_MAX_TXD_PWR)
1265
1266 static int
1267 ixgb_tx_map(struct ixgb_adapter *adapter, struct sk_buff *skb,
1268             unsigned int first)
1269 {
1270         struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
1271         struct ixgb_buffer *buffer_info;
1272         int len = skb->len;
1273         unsigned int offset = 0, size, count = 0, i;
1274
1275         unsigned int nr_frags = skb_shinfo(skb)->nr_frags;
1276         unsigned int f;
1277
1278         len -= skb->data_len;
1279
1280         i = tx_ring->next_to_use;
1281
1282         while(len) {
1283                 buffer_info = &tx_ring->buffer_info[i];
1284                 size = min(len, IXGB_MAX_JUMBO_FRAME_SIZE);
1285                 buffer_info->length = size;
1286                 buffer_info->dma =
1287                         pci_map_single(adapter->pdev,
1288                                 skb->data + offset,
1289                                 size,
1290                                 PCI_DMA_TODEVICE);
1291                 buffer_info->time_stamp = jiffies;
1292                 buffer_info->next_to_watch = 0;
1293
1294                 len -= size;
1295                 offset += size;
1296                 count++;
1297                 if(++i == tx_ring->count) i = 0;
1298         }
1299
1300         for(f = 0; f < nr_frags; f++) {
1301                 struct skb_frag_struct *frag;
1302
1303                 frag = &skb_shinfo(skb)->frags[f];
1304                 len = frag->size;
1305                 offset = 0;
1306
1307                 while(len) {
1308                         buffer_info = &tx_ring->buffer_info[i];
1309                         size = min(len, IXGB_MAX_JUMBO_FRAME_SIZE);
1310                         buffer_info->length = size;
1311                         buffer_info->dma =
1312                                 pci_map_page(adapter->pdev,
1313                                         frag->page,
1314                                         frag->page_offset + offset,
1315                                         size,
1316                                         PCI_DMA_TODEVICE);
1317                         buffer_info->time_stamp = jiffies;
1318                         buffer_info->next_to_watch = 0;
1319
1320                         len -= size;
1321                         offset += size;
1322                         count++;
1323                         if(++i == tx_ring->count) i = 0;
1324                 }
1325         }
1326         i = (i == 0) ? tx_ring->count - 1 : i - 1;
1327         tx_ring->buffer_info[i].skb = skb;
1328         tx_ring->buffer_info[first].next_to_watch = i;
1329
1330         return count;
1331 }
1332
1333 static void
1334 ixgb_tx_queue(struct ixgb_adapter *adapter, int count, int vlan_id,int tx_flags)
1335 {
1336         struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
1337         struct ixgb_tx_desc *tx_desc = NULL;
1338         struct ixgb_buffer *buffer_info;
1339         uint32_t cmd_type_len = adapter->tx_cmd_type;
1340         uint8_t status = 0;
1341         uint8_t popts = 0;
1342         unsigned int i;
1343
1344         if(tx_flags & IXGB_TX_FLAGS_TSO) {
1345                 cmd_type_len |= IXGB_TX_DESC_CMD_TSE;
1346                 popts |= (IXGB_TX_DESC_POPTS_IXSM | IXGB_TX_DESC_POPTS_TXSM);
1347         }
1348
1349         if(tx_flags & IXGB_TX_FLAGS_CSUM)
1350                 popts |= IXGB_TX_DESC_POPTS_TXSM;
1351
1352         if(tx_flags & IXGB_TX_FLAGS_VLAN) {
1353                 cmd_type_len |= IXGB_TX_DESC_CMD_VLE;
1354         }
1355
1356         i = tx_ring->next_to_use;
1357
1358         while(count--) {
1359                 buffer_info = &tx_ring->buffer_info[i];
1360                 tx_desc = IXGB_TX_DESC(*tx_ring, i);
1361                 tx_desc->buff_addr = cpu_to_le64(buffer_info->dma);
1362                 tx_desc->cmd_type_len =
1363                         cpu_to_le32(cmd_type_len | buffer_info->length);
1364                 tx_desc->status = status;
1365                 tx_desc->popts = popts;
1366                 tx_desc->vlan = cpu_to_le16(vlan_id);
1367
1368                 if(++i == tx_ring->count) i = 0;
1369         }
1370
1371         tx_desc->cmd_type_len |= cpu_to_le32(IXGB_TX_DESC_CMD_EOP
1372                                 | IXGB_TX_DESC_CMD_RS );
1373
1374         /* Force memory writes to complete before letting h/w
1375          * know there are new descriptors to fetch.  (Only
1376          * applicable for weak-ordered memory model archs,
1377          * such as IA-64). */
1378         wmb();
1379
1380         tx_ring->next_to_use = i;
1381         IXGB_WRITE_REG(&adapter->hw, TDT, i);
1382 }
1383
1384 /* Tx Descriptors needed, worst case */
1385 #define TXD_USE_COUNT(S) (((S) >> IXGB_MAX_TXD_PWR) + \
1386                          (((S) & (IXGB_MAX_DATA_PER_TXD - 1)) ? 1 : 0))
1387 #define DESC_NEEDED TXD_USE_COUNT(IXGB_MAX_DATA_PER_TXD) + \
1388         MAX_SKB_FRAGS * TXD_USE_COUNT(PAGE_SIZE) + 1
1389
1390 static int
1391 ixgb_xmit_frame(struct sk_buff *skb, struct net_device *netdev)
1392 {
1393         struct ixgb_adapter *adapter = netdev_priv(netdev);
1394         unsigned int first;
1395         unsigned int tx_flags = 0;
1396         unsigned long flags;
1397         int vlan_id = 0;
1398         int tso;
1399
1400         if(skb->len <= 0) {
1401                 dev_kfree_skb_any(skb);
1402                 return 0;
1403         }
1404
1405 #ifdef NETIF_F_LLTX
1406         local_irq_save(flags);
1407         if (!spin_trylock(&adapter->tx_lock)) {
1408                 /* Collision - tell upper layer to requeue */
1409                 local_irq_restore(flags);
1410                 return NETDEV_TX_LOCKED;
1411         }
1412 #else
1413         spin_lock_irqsave(&adapter->tx_lock, flags);
1414 #endif
1415
1416         if(unlikely(IXGB_DESC_UNUSED(&adapter->tx_ring) < DESC_NEEDED)) {
1417                 netif_stop_queue(netdev);
1418                 spin_unlock_irqrestore(&adapter->tx_lock, flags);
1419                 return NETDEV_TX_BUSY;
1420         }
1421
1422 #ifndef NETIF_F_LLTX
1423         spin_unlock_irqrestore(&adapter->tx_lock, flags);
1424 #endif
1425
1426         if(adapter->vlgrp && vlan_tx_tag_present(skb)) {
1427                 tx_flags |= IXGB_TX_FLAGS_VLAN;
1428                 vlan_id = vlan_tx_tag_get(skb);
1429         }
1430
1431         first = adapter->tx_ring.next_to_use;
1432
1433         tso = ixgb_tso(adapter, skb);
1434         if (tso < 0) {
1435                 dev_kfree_skb_any(skb);
1436 #ifdef NETIF_F_LLTX
1437                 spin_unlock_irqrestore(&adapter->tx_lock, flags);
1438 #endif
1439                 return NETDEV_TX_OK;
1440         }
1441
1442         if (likely(tso))
1443                 tx_flags |= IXGB_TX_FLAGS_TSO;
1444         else if(ixgb_tx_csum(adapter, skb))
1445                 tx_flags |= IXGB_TX_FLAGS_CSUM;
1446
1447         ixgb_tx_queue(adapter, ixgb_tx_map(adapter, skb, first), vlan_id,
1448                         tx_flags);
1449
1450         netdev->trans_start = jiffies;
1451
1452 #ifdef NETIF_F_LLTX
1453         /* Make sure there is space in the ring for the next send. */
1454         if(unlikely(IXGB_DESC_UNUSED(&adapter->tx_ring) < DESC_NEEDED))
1455                 netif_stop_queue(netdev);
1456
1457         spin_unlock_irqrestore(&adapter->tx_lock, flags);
1458
1459 #endif
1460         return NETDEV_TX_OK;
1461 }
1462
1463 /**
1464  * ixgb_tx_timeout - Respond to a Tx Hang
1465  * @netdev: network interface device structure
1466  **/
1467
1468 static void
1469 ixgb_tx_timeout(struct net_device *netdev)
1470 {
1471         struct ixgb_adapter *adapter = netdev_priv(netdev);
1472
1473         /* Do the reset outside of interrupt context */
1474         schedule_work(&adapter->tx_timeout_task);
1475 }
1476
1477 static void
1478 ixgb_tx_timeout_task(struct net_device *netdev)
1479 {
1480         struct ixgb_adapter *adapter = netdev_priv(netdev);
1481
1482         adapter->tx_timeout_count++;
1483         ixgb_down(adapter, TRUE);
1484         ixgb_up(adapter);
1485 }
1486
1487 /**
1488  * ixgb_get_stats - Get System Network Statistics
1489  * @netdev: network interface device structure
1490  *
1491  * Returns the address of the device statistics structure.
1492  * The statistics are actually updated from the timer callback.
1493  **/
1494
1495 static struct net_device_stats *
1496 ixgb_get_stats(struct net_device *netdev)
1497 {
1498         struct ixgb_adapter *adapter = netdev_priv(netdev);
1499
1500         return &adapter->net_stats;
1501 }
1502
1503 /**
1504  * ixgb_change_mtu - Change the Maximum Transfer Unit
1505  * @netdev: network interface device structure
1506  * @new_mtu: new value for maximum frame size
1507  *
1508  * Returns 0 on success, negative on failure
1509  **/
1510
1511 static int
1512 ixgb_change_mtu(struct net_device *netdev, int new_mtu)
1513 {
1514         struct ixgb_adapter *adapter = netdev_priv(netdev);
1515         int max_frame = new_mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;
1516         int old_max_frame = netdev->mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;
1517
1518
1519         if((max_frame < IXGB_MIN_ENET_FRAME_SIZE_WITHOUT_FCS + ENET_FCS_LENGTH)
1520            || (max_frame > IXGB_MAX_JUMBO_FRAME_SIZE + ENET_FCS_LENGTH)) {
1521                 DPRINTK(PROBE, ERR, "Invalid MTU setting %d\n", new_mtu);
1522                 return -EINVAL;
1523         }
1524
1525         adapter->rx_buffer_len = max_frame;
1526
1527         netdev->mtu = new_mtu;
1528
1529         if ((old_max_frame != max_frame) && netif_running(netdev)) {
1530                 ixgb_down(adapter, TRUE);
1531                 ixgb_up(adapter);
1532         }
1533
1534         return 0;
1535 }
1536
1537 /**
1538  * ixgb_update_stats - Update the board statistics counters.
1539  * @adapter: board private structure
1540  **/
1541
1542 void
1543 ixgb_update_stats(struct ixgb_adapter *adapter)
1544 {
1545         struct net_device *netdev = adapter->netdev;
1546
1547         if((netdev->flags & IFF_PROMISC) || (netdev->flags & IFF_ALLMULTI) ||
1548            (netdev->mc_count > IXGB_MAX_NUM_MULTICAST_ADDRESSES)) {
1549                 u64 multi = IXGB_READ_REG(&adapter->hw, MPRCL);
1550                 u32 bcast_l = IXGB_READ_REG(&adapter->hw, BPRCL);
1551                 u32 bcast_h = IXGB_READ_REG(&adapter->hw, BPRCH);
1552                 u64 bcast = ((u64)bcast_h << 32) | bcast_l;
1553
1554                 multi |= ((u64)IXGB_READ_REG(&adapter->hw, MPRCH) << 32);
1555                 /* fix up multicast stats by removing broadcasts */
1556                 if(multi >= bcast)
1557                         multi -= bcast;
1558
1559                 adapter->stats.mprcl += (multi & 0xFFFFFFFF);
1560                 adapter->stats.mprch += (multi >> 32);
1561                 adapter->stats.bprcl += bcast_l;
1562                 adapter->stats.bprch += bcast_h;
1563         } else {
1564                 adapter->stats.mprcl += IXGB_READ_REG(&adapter->hw, MPRCL);
1565                 adapter->stats.mprch += IXGB_READ_REG(&adapter->hw, MPRCH);
1566                 adapter->stats.bprcl += IXGB_READ_REG(&adapter->hw, BPRCL);
1567                 adapter->stats.bprch += IXGB_READ_REG(&adapter->hw, BPRCH);
1568         }
1569         adapter->stats.tprl += IXGB_READ_REG(&adapter->hw, TPRL);
1570         adapter->stats.tprh += IXGB_READ_REG(&adapter->hw, TPRH);
1571         adapter->stats.gprcl += IXGB_READ_REG(&adapter->hw, GPRCL);
1572         adapter->stats.gprch += IXGB_READ_REG(&adapter->hw, GPRCH);
1573         adapter->stats.uprcl += IXGB_READ_REG(&adapter->hw, UPRCL);
1574         adapter->stats.uprch += IXGB_READ_REG(&adapter->hw, UPRCH);
1575         adapter->stats.vprcl += IXGB_READ_REG(&adapter->hw, VPRCL);
1576         adapter->stats.vprch += IXGB_READ_REG(&adapter->hw, VPRCH);
1577         adapter->stats.jprcl += IXGB_READ_REG(&adapter->hw, JPRCL);
1578         adapter->stats.jprch += IXGB_READ_REG(&adapter->hw, JPRCH);
1579         adapter->stats.gorcl += IXGB_READ_REG(&adapter->hw, GORCL);
1580         adapter->stats.gorch += IXGB_READ_REG(&adapter->hw, GORCH);
1581         adapter->stats.torl += IXGB_READ_REG(&adapter->hw, TORL);
1582         adapter->stats.torh += IXGB_READ_REG(&adapter->hw, TORH);
1583         adapter->stats.rnbc += IXGB_READ_REG(&adapter->hw, RNBC);
1584         adapter->stats.ruc += IXGB_READ_REG(&adapter->hw, RUC);
1585         adapter->stats.roc += IXGB_READ_REG(&adapter->hw, ROC);
1586         adapter->stats.rlec += IXGB_READ_REG(&adapter->hw, RLEC);
1587         adapter->stats.crcerrs += IXGB_READ_REG(&adapter->hw, CRCERRS);
1588         adapter->stats.icbc += IXGB_READ_REG(&adapter->hw, ICBC);
1589         adapter->stats.ecbc += IXGB_READ_REG(&adapter->hw, ECBC);
1590         adapter->stats.mpc += IXGB_READ_REG(&adapter->hw, MPC);
1591         adapter->stats.tptl += IXGB_READ_REG(&adapter->hw, TPTL);
1592         adapter->stats.tpth += IXGB_READ_REG(&adapter->hw, TPTH);
1593         adapter->stats.gptcl += IXGB_READ_REG(&adapter->hw, GPTCL);
1594         adapter->stats.gptch += IXGB_READ_REG(&adapter->hw, GPTCH);
1595         adapter->stats.bptcl += IXGB_READ_REG(&adapter->hw, BPTCL);
1596         adapter->stats.bptch += IXGB_READ_REG(&adapter->hw, BPTCH);
1597         adapter->stats.mptcl += IXGB_READ_REG(&adapter->hw, MPTCL);
1598         adapter->stats.mptch += IXGB_READ_REG(&adapter->hw, MPTCH);
1599         adapter->stats.uptcl += IXGB_READ_REG(&adapter->hw, UPTCL);
1600         adapter->stats.uptch += IXGB_READ_REG(&adapter->hw, UPTCH);
1601         adapter->stats.vptcl += IXGB_READ_REG(&adapter->hw, VPTCL);
1602         adapter->stats.vptch += IXGB_READ_REG(&adapter->hw, VPTCH);
1603         adapter->stats.jptcl += IXGB_READ_REG(&adapter->hw, JPTCL);
1604         adapter->stats.jptch += IXGB_READ_REG(&adapter->hw, JPTCH);
1605         adapter->stats.gotcl += IXGB_READ_REG(&adapter->hw, GOTCL);
1606         adapter->stats.gotch += IXGB_READ_REG(&adapter->hw, GOTCH);
1607         adapter->stats.totl += IXGB_READ_REG(&adapter->hw, TOTL);
1608         adapter->stats.toth += IXGB_READ_REG(&adapter->hw, TOTH);
1609         adapter->stats.dc += IXGB_READ_REG(&adapter->hw, DC);
1610         adapter->stats.plt64c += IXGB_READ_REG(&adapter->hw, PLT64C);
1611         adapter->stats.tsctc += IXGB_READ_REG(&adapter->hw, TSCTC);
1612         adapter->stats.tsctfc += IXGB_READ_REG(&adapter->hw, TSCTFC);
1613         adapter->stats.ibic += IXGB_READ_REG(&adapter->hw, IBIC);
1614         adapter->stats.rfc += IXGB_READ_REG(&adapter->hw, RFC);
1615         adapter->stats.lfc += IXGB_READ_REG(&adapter->hw, LFC);
1616         adapter->stats.pfrc += IXGB_READ_REG(&adapter->hw, PFRC);
1617         adapter->stats.pftc += IXGB_READ_REG(&adapter->hw, PFTC);
1618         adapter->stats.mcfrc += IXGB_READ_REG(&adapter->hw, MCFRC);
1619         adapter->stats.mcftc += IXGB_READ_REG(&adapter->hw, MCFTC);
1620         adapter->stats.xonrxc += IXGB_READ_REG(&adapter->hw, XONRXC);
1621         adapter->stats.xontxc += IXGB_READ_REG(&adapter->hw, XONTXC);
1622         adapter->stats.xoffrxc += IXGB_READ_REG(&adapter->hw, XOFFRXC);
1623         adapter->stats.xofftxc += IXGB_READ_REG(&adapter->hw, XOFFTXC);
1624         adapter->stats.rjc += IXGB_READ_REG(&adapter->hw, RJC);
1625
1626         /* Fill out the OS statistics structure */
1627
1628         adapter->net_stats.rx_packets = adapter->stats.gprcl;
1629         adapter->net_stats.tx_packets = adapter->stats.gptcl;
1630         adapter->net_stats.rx_bytes = adapter->stats.gorcl;
1631         adapter->net_stats.tx_bytes = adapter->stats.gotcl;
1632         adapter->net_stats.multicast = adapter->stats.mprcl;
1633         adapter->net_stats.collisions = 0;
1634
1635         /* ignore RLEC as it reports errors for padded (<64bytes) frames
1636          * with a length in the type/len field */
1637         adapter->net_stats.rx_errors =
1638             /* adapter->stats.rnbc + */ adapter->stats.crcerrs +
1639             adapter->stats.ruc +
1640             adapter->stats.roc /*+ adapter->stats.rlec */  +
1641             adapter->stats.icbc +
1642             adapter->stats.ecbc + adapter->stats.mpc;
1643
1644         /* see above
1645          * adapter->net_stats.rx_length_errors = adapter->stats.rlec;
1646          */
1647
1648         adapter->net_stats.rx_crc_errors = adapter->stats.crcerrs;
1649         adapter->net_stats.rx_fifo_errors = adapter->stats.mpc;
1650         adapter->net_stats.rx_missed_errors = adapter->stats.mpc;
1651         adapter->net_stats.rx_over_errors = adapter->stats.mpc;
1652
1653         adapter->net_stats.tx_errors = 0;
1654         adapter->net_stats.rx_frame_errors = 0;
1655         adapter->net_stats.tx_aborted_errors = 0;
1656         adapter->net_stats.tx_carrier_errors = 0;
1657         adapter->net_stats.tx_fifo_errors = 0;
1658         adapter->net_stats.tx_heartbeat_errors = 0;
1659         adapter->net_stats.tx_window_errors = 0;
1660 }
1661
1662 #define IXGB_MAX_INTR 10
1663 /**
1664  * ixgb_intr - Interrupt Handler
1665  * @irq: interrupt number
1666  * @data: pointer to a network interface device structure
1667  * @pt_regs: CPU registers structure
1668  **/
1669
1670 static irqreturn_t
1671 ixgb_intr(int irq, void *data, struct pt_regs *regs)
1672 {
1673         struct net_device *netdev = data;
1674         struct ixgb_adapter *adapter = netdev_priv(netdev);
1675         struct ixgb_hw *hw = &adapter->hw;
1676         uint32_t icr = IXGB_READ_REG(hw, ICR);
1677 #ifndef CONFIG_IXGB_NAPI
1678         unsigned int i;
1679 #endif
1680
1681         if(unlikely(!icr))
1682                 return IRQ_NONE;  /* Not our interrupt */
1683
1684         if(unlikely(icr & (IXGB_INT_RXSEQ | IXGB_INT_LSC))) {
1685                 mod_timer(&adapter->watchdog_timer, jiffies);
1686         }
1687
1688 #ifdef CONFIG_IXGB_NAPI
1689         if(netif_rx_schedule_prep(netdev)) {
1690
1691                 /* Disable interrupts and register for poll. The flush
1692                   of the posted write is intentionally left out.
1693                 */
1694
1695                 atomic_inc(&adapter->irq_sem);
1696                 IXGB_WRITE_REG(&adapter->hw, IMC, ~0);
1697                 __netif_rx_schedule(netdev);
1698         }
1699 #else
1700         /* yes, that is actually a & and it is meant to make sure that
1701          * every pass through this for loop checks both receive and
1702          * transmit queues for completed descriptors, intended to
1703          * avoid starvation issues and assist tx/rx fairness. */
1704         for(i = 0; i < IXGB_MAX_INTR; i++)
1705                 if(!ixgb_clean_rx_irq(adapter) &
1706                    !ixgb_clean_tx_irq(adapter))
1707                         break;
1708 #endif
1709         return IRQ_HANDLED;
1710 }
1711
1712 #ifdef CONFIG_IXGB_NAPI
1713 /**
1714  * ixgb_clean - NAPI Rx polling callback
1715  * @adapter: board private structure
1716  **/
1717
1718 static int
1719 ixgb_clean(struct net_device *netdev, int *budget)
1720 {
1721         struct ixgb_adapter *adapter = netdev_priv(netdev);
1722         int work_to_do = min(*budget, netdev->quota);
1723         int tx_cleaned;
1724         int work_done = 0;
1725
1726         tx_cleaned = ixgb_clean_tx_irq(adapter);
1727         ixgb_clean_rx_irq(adapter, &work_done, work_to_do);
1728
1729         *budget -= work_done;
1730         netdev->quota -= work_done;
1731
1732         /* if no Tx and not enough Rx work done, exit the polling mode */
1733         if((!tx_cleaned && (work_done == 0)) || !netif_running(netdev)) {
1734                 netif_rx_complete(netdev);
1735                 ixgb_irq_enable(adapter);
1736                 return 0;
1737         }
1738
1739         return 1;
1740 }
1741 #endif
1742
1743 /**
1744  * ixgb_clean_tx_irq - Reclaim resources after transmit completes
1745  * @adapter: board private structure
1746  **/
1747
1748 static boolean_t
1749 ixgb_clean_tx_irq(struct ixgb_adapter *adapter)
1750 {
1751         struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
1752         struct net_device *netdev = adapter->netdev;
1753         struct ixgb_tx_desc *tx_desc, *eop_desc;
1754         struct ixgb_buffer *buffer_info;
1755         unsigned int i, eop;
1756         boolean_t cleaned = FALSE;
1757
1758         i = tx_ring->next_to_clean;
1759         eop = tx_ring->buffer_info[i].next_to_watch;
1760         eop_desc = IXGB_TX_DESC(*tx_ring, eop);
1761
1762         while(eop_desc->status & IXGB_TX_DESC_STATUS_DD) {
1763
1764                 for(cleaned = FALSE; !cleaned; ) {
1765                         tx_desc = IXGB_TX_DESC(*tx_ring, i);
1766                         buffer_info = &tx_ring->buffer_info[i];
1767
1768                         if (tx_desc->popts
1769                             & (IXGB_TX_DESC_POPTS_TXSM |
1770                                IXGB_TX_DESC_POPTS_IXSM))
1771                                 adapter->hw_csum_tx_good++;
1772
1773                         ixgb_unmap_and_free_tx_resource(adapter, buffer_info);
1774
1775                         *(uint32_t *)&(tx_desc->status) = 0;
1776
1777                         cleaned = (i == eop);
1778                         if(++i == tx_ring->count) i = 0;
1779                 }
1780
1781                 eop = tx_ring->buffer_info[i].next_to_watch;
1782                 eop_desc = IXGB_TX_DESC(*tx_ring, eop);
1783         }
1784
1785         tx_ring->next_to_clean = i;
1786
1787         if (unlikely(netif_queue_stopped(netdev))) {
1788                 spin_lock(&adapter->tx_lock);
1789                 if (netif_queue_stopped(netdev) && netif_carrier_ok(netdev) &&
1790                     (IXGB_DESC_UNUSED(tx_ring) > IXGB_TX_QUEUE_WAKE))
1791                         netif_wake_queue(netdev);
1792                 spin_unlock(&adapter->tx_lock);
1793         }
1794
1795         if(adapter->detect_tx_hung) {
1796                 /* detect a transmit hang in hardware, this serializes the
1797                  * check with the clearing of time_stamp and movement of i */
1798                 adapter->detect_tx_hung = FALSE;
1799                 if (tx_ring->buffer_info[eop].dma &&
1800                    time_after(jiffies, tx_ring->buffer_info[eop].time_stamp + HZ)
1801                    && !(IXGB_READ_REG(&adapter->hw, STATUS) &
1802                         IXGB_STATUS_TXOFF)) {
1803                         /* detected Tx unit hang */
1804                         DPRINTK(DRV, ERR, "Detected Tx Unit Hang\n"
1805                                         "  TDH                  <%x>\n"
1806                                         "  TDT                  <%x>\n"
1807                                         "  next_to_use          <%x>\n"
1808                                         "  next_to_clean        <%x>\n"
1809                                         "buffer_info[next_to_clean]\n"
1810                                         "  time_stamp           <%lx>\n"
1811                                         "  next_to_watch        <%x>\n"
1812                                         "  jiffies              <%lx>\n"
1813                                         "  next_to_watch.status <%x>\n",
1814                                 IXGB_READ_REG(&adapter->hw, TDH),
1815                                 IXGB_READ_REG(&adapter->hw, TDT),
1816                                 tx_ring->next_to_use,
1817                                 tx_ring->next_to_clean,
1818                                 tx_ring->buffer_info[eop].time_stamp,
1819                                 eop,
1820                                 jiffies,
1821                                 eop_desc->status);
1822                         netif_stop_queue(netdev);
1823                 }
1824         }
1825
1826         return cleaned;
1827 }
1828
1829 /**
1830  * ixgb_rx_checksum - Receive Checksum Offload for 82597.
1831  * @adapter: board private structure
1832  * @rx_desc: receive descriptor
1833  * @sk_buff: socket buffer with received data
1834  **/
1835
1836 static void
1837 ixgb_rx_checksum(struct ixgb_adapter *adapter,
1838                  struct ixgb_rx_desc *rx_desc,
1839                  struct sk_buff *skb)
1840 {
1841         /* Ignore Checksum bit is set OR
1842          * TCP Checksum has not been calculated
1843          */
1844         if((rx_desc->status & IXGB_RX_DESC_STATUS_IXSM) ||
1845            (!(rx_desc->status & IXGB_RX_DESC_STATUS_TCPCS))) {
1846                 skb->ip_summed = CHECKSUM_NONE;
1847                 return;
1848         }
1849
1850         /* At this point we know the hardware did the TCP checksum */
1851         /* now look at the TCP checksum error bit */
1852         if(rx_desc->errors & IXGB_RX_DESC_ERRORS_TCPE) {
1853                 /* let the stack verify checksum errors */
1854                 skb->ip_summed = CHECKSUM_NONE;
1855                 adapter->hw_csum_rx_error++;
1856         } else {
1857                 /* TCP checksum is good */
1858                 skb->ip_summed = CHECKSUM_UNNECESSARY;
1859                 adapter->hw_csum_rx_good++;
1860         }
1861 }
1862
1863 /**
1864  * ixgb_clean_rx_irq - Send received data up the network stack,
1865  * @adapter: board private structure
1866  **/
1867
1868 static boolean_t
1869 #ifdef CONFIG_IXGB_NAPI
1870 ixgb_clean_rx_irq(struct ixgb_adapter *adapter, int *work_done, int work_to_do)
1871 #else
1872 ixgb_clean_rx_irq(struct ixgb_adapter *adapter)
1873 #endif
1874 {
1875         struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
1876         struct net_device *netdev = adapter->netdev;
1877         struct pci_dev *pdev = adapter->pdev;
1878         struct ixgb_rx_desc *rx_desc, *next_rxd;
1879         struct ixgb_buffer *buffer_info, *next_buffer, *next2_buffer;
1880         uint32_t length;
1881         unsigned int i, j;
1882         boolean_t cleaned = FALSE;
1883
1884         i = rx_ring->next_to_clean;
1885         rx_desc = IXGB_RX_DESC(*rx_ring, i);
1886         buffer_info = &rx_ring->buffer_info[i];
1887
1888         while(rx_desc->status & IXGB_RX_DESC_STATUS_DD) {
1889                 struct sk_buff *skb, *next_skb;
1890                 u8 status;
1891
1892 #ifdef CONFIG_IXGB_NAPI
1893                 if(*work_done >= work_to_do)
1894                         break;
1895
1896                 (*work_done)++;
1897 #endif
1898                 status = rx_desc->status;
1899                 skb = buffer_info->skb;
1900                 buffer_info->skb = NULL;
1901
1902                 prefetch(skb->data);
1903
1904                 if(++i == rx_ring->count) i = 0;
1905                 next_rxd = IXGB_RX_DESC(*rx_ring, i);
1906                 prefetch(next_rxd);
1907
1908                 if((j = i + 1) == rx_ring->count) j = 0;
1909                 next2_buffer = &rx_ring->buffer_info[j];
1910                 prefetch(next2_buffer);
1911
1912                 next_buffer = &rx_ring->buffer_info[i];
1913                 next_skb = next_buffer->skb;
1914                 prefetch(next_skb);
1915
1916                 cleaned = TRUE;
1917
1918                 pci_unmap_single(pdev,
1919                                  buffer_info->dma,
1920                                  buffer_info->length,
1921                                  PCI_DMA_FROMDEVICE);
1922
1923                 length = le16_to_cpu(rx_desc->length);
1924
1925                 if(unlikely(!(status & IXGB_RX_DESC_STATUS_EOP))) {
1926
1927                         /* All receives must fit into a single buffer */
1928
1929                         IXGB_DBG("Receive packet consumed multiple buffers "
1930                                          "length<%x>\n", length);
1931
1932                         dev_kfree_skb_irq(skb);
1933                         goto rxdesc_done;
1934                 }
1935
1936                 if (unlikely(rx_desc->errors
1937                              & (IXGB_RX_DESC_ERRORS_CE | IXGB_RX_DESC_ERRORS_SE
1938                                 | IXGB_RX_DESC_ERRORS_P |
1939                                 IXGB_RX_DESC_ERRORS_RXE))) {
1940
1941                         dev_kfree_skb_irq(skb);
1942                         goto rxdesc_done;
1943                 }
1944
1945                 /* code added for copybreak, this should improve
1946                  * performance for small packets with large amounts
1947                  * of reassembly being done in the stack */
1948 #define IXGB_CB_LENGTH 256
1949                 if (length < IXGB_CB_LENGTH) {
1950                         struct sk_buff *new_skb =
1951                             dev_alloc_skb(length + NET_IP_ALIGN);
1952                         if (new_skb) {
1953                                 skb_reserve(new_skb, NET_IP_ALIGN);
1954                                 new_skb->dev = netdev;
1955                                 memcpy(new_skb->data - NET_IP_ALIGN,
1956                                        skb->data - NET_IP_ALIGN,
1957                                        length + NET_IP_ALIGN);
1958                                 /* save the skb in buffer_info as good */
1959                                 buffer_info->skb = skb;
1960                                 skb = new_skb;
1961                         }
1962                 }
1963                 /* end copybreak code */
1964
1965                 /* Good Receive */
1966                 skb_put(skb, length);
1967
1968                 /* Receive Checksum Offload */
1969                 ixgb_rx_checksum(adapter, rx_desc, skb);
1970
1971                 skb->protocol = eth_type_trans(skb, netdev);
1972 #ifdef CONFIG_IXGB_NAPI
1973                 if(adapter->vlgrp && (status & IXGB_RX_DESC_STATUS_VP)) {
1974                         vlan_hwaccel_receive_skb(skb, adapter->vlgrp,
1975                                 le16_to_cpu(rx_desc->special) &
1976                                         IXGB_RX_DESC_SPECIAL_VLAN_MASK);
1977                 } else {
1978                         netif_receive_skb(skb);
1979                 }
1980 #else /* CONFIG_IXGB_NAPI */
1981                 if(adapter->vlgrp && (status & IXGB_RX_DESC_STATUS_VP)) {
1982                         vlan_hwaccel_rx(skb, adapter->vlgrp,
1983                                 le16_to_cpu(rx_desc->special) &
1984                                         IXGB_RX_DESC_SPECIAL_VLAN_MASK);
1985                 } else {
1986                         netif_rx(skb);
1987                 }
1988 #endif /* CONFIG_IXGB_NAPI */
1989                 netdev->last_rx = jiffies;
1990
1991 rxdesc_done:
1992                 /* clean up descriptor, might be written over by hw */
1993                 rx_desc->status = 0;
1994
1995                 /* use prefetched values */
1996                 rx_desc = next_rxd;
1997                 buffer_info = next_buffer;
1998         }
1999
2000         rx_ring->next_to_clean = i;
2001
2002         ixgb_alloc_rx_buffers(adapter);
2003
2004         return cleaned;
2005 }
2006
2007 /**
2008  * ixgb_alloc_rx_buffers - Replace used receive buffers
2009  * @adapter: address of board private structure
2010  **/
2011
2012 static void
2013 ixgb_alloc_rx_buffers(struct ixgb_adapter *adapter)
2014 {
2015         struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
2016         struct net_device *netdev = adapter->netdev;
2017         struct pci_dev *pdev = adapter->pdev;
2018         struct ixgb_rx_desc *rx_desc;
2019         struct ixgb_buffer *buffer_info;
2020         struct sk_buff *skb;
2021         unsigned int i;
2022         int num_group_tail_writes;
2023         long cleancount;
2024
2025         i = rx_ring->next_to_use;
2026         buffer_info = &rx_ring->buffer_info[i];
2027         cleancount = IXGB_DESC_UNUSED(rx_ring);
2028
2029         num_group_tail_writes = IXGB_RX_BUFFER_WRITE;
2030
2031         /* leave three descriptors unused */
2032         while(--cleancount > 2) {
2033                 /* recycle! its good for you */
2034                 if (!(skb = buffer_info->skb))
2035                         skb = dev_alloc_skb(adapter->rx_buffer_len
2036                                             + NET_IP_ALIGN);
2037                 else {
2038                         skb_trim(skb, 0);
2039                         goto map_skb;
2040                 }
2041
2042                 if (unlikely(!skb)) {
2043                         /* Better luck next round */
2044                         adapter->alloc_rx_buff_failed++;
2045                         break;
2046                 }
2047
2048                 /* Make buffer alignment 2 beyond a 16 byte boundary
2049                  * this will result in a 16 byte aligned IP header after
2050                  * the 14 byte MAC header is removed
2051                  */
2052                 skb_reserve(skb, NET_IP_ALIGN);
2053
2054                 skb->dev = netdev;
2055
2056                 buffer_info->skb = skb;
2057                 buffer_info->length = adapter->rx_buffer_len;
2058 map_skb:
2059                 buffer_info->dma = pci_map_single(pdev,
2060                                                   skb->data,
2061                                                   adapter->rx_buffer_len,
2062                                                   PCI_DMA_FROMDEVICE);
2063
2064                 rx_desc = IXGB_RX_DESC(*rx_ring, i);
2065                 rx_desc->buff_addr = cpu_to_le64(buffer_info->dma);
2066                 /* guarantee DD bit not set now before h/w gets descriptor
2067                  * this is the rest of the workaround for h/w double
2068                  * writeback. */
2069                 rx_desc->status = 0;
2070
2071
2072                 if(++i == rx_ring->count) i = 0;
2073                 buffer_info = &rx_ring->buffer_info[i];
2074         }
2075
2076         if (likely(rx_ring->next_to_use != i)) {
2077                 rx_ring->next_to_use = i;
2078                 if (unlikely(i-- == 0))
2079                         i = (rx_ring->count - 1);
2080
2081                 /* Force memory writes to complete before letting h/w
2082                  * know there are new descriptors to fetch.  (Only
2083                  * applicable for weak-ordered memory model archs, such
2084                  * as IA-64). */
2085                 wmb();
2086                 IXGB_WRITE_REG(&adapter->hw, RDT, i);
2087         }
2088 }
2089
2090 /**
2091  * ixgb_vlan_rx_register - enables or disables vlan tagging/stripping.
2092  *
2093  * @param netdev network interface device structure
2094  * @param grp indicates to enable or disable tagging/stripping
2095  **/
2096 static void
2097 ixgb_vlan_rx_register(struct net_device *netdev, struct vlan_group *grp)
2098 {
2099         struct ixgb_adapter *adapter = netdev_priv(netdev);
2100         uint32_t ctrl, rctl;
2101
2102         ixgb_irq_disable(adapter);
2103         adapter->vlgrp = grp;
2104
2105         if(grp) {
2106                 /* enable VLAN tag insert/strip */
2107                 ctrl = IXGB_READ_REG(&adapter->hw, CTRL0);
2108                 ctrl |= IXGB_CTRL0_VME;
2109                 IXGB_WRITE_REG(&adapter->hw, CTRL0, ctrl);
2110
2111                 /* enable VLAN receive filtering */
2112
2113                 rctl = IXGB_READ_REG(&adapter->hw, RCTL);
2114                 rctl |= IXGB_RCTL_VFE;
2115                 rctl &= ~IXGB_RCTL_CFIEN;
2116                 IXGB_WRITE_REG(&adapter->hw, RCTL, rctl);
2117         } else {
2118                 /* disable VLAN tag insert/strip */
2119
2120                 ctrl = IXGB_READ_REG(&adapter->hw, CTRL0);
2121                 ctrl &= ~IXGB_CTRL0_VME;
2122                 IXGB_WRITE_REG(&adapter->hw, CTRL0, ctrl);
2123
2124                 /* disable VLAN filtering */
2125
2126                 rctl = IXGB_READ_REG(&adapter->hw, RCTL);
2127                 rctl &= ~IXGB_RCTL_VFE;
2128                 IXGB_WRITE_REG(&adapter->hw, RCTL, rctl);
2129         }
2130
2131         ixgb_irq_enable(adapter);
2132 }
2133
2134 static void
2135 ixgb_vlan_rx_add_vid(struct net_device *netdev, uint16_t vid)
2136 {
2137         struct ixgb_adapter *adapter = netdev_priv(netdev);
2138         uint32_t vfta, index;
2139
2140         /* add VID to filter table */
2141
2142         index = (vid >> 5) & 0x7F;
2143         vfta = IXGB_READ_REG_ARRAY(&adapter->hw, VFTA, index);
2144         vfta |= (1 << (vid & 0x1F));
2145         ixgb_write_vfta(&adapter->hw, index, vfta);
2146 }
2147
2148 static void
2149 ixgb_vlan_rx_kill_vid(struct net_device *netdev, uint16_t vid)
2150 {
2151         struct ixgb_adapter *adapter = netdev_priv(netdev);
2152         uint32_t vfta, index;
2153
2154         ixgb_irq_disable(adapter);
2155
2156         if(adapter->vlgrp)
2157                 adapter->vlgrp->vlan_devices[vid] = NULL;
2158
2159         ixgb_irq_enable(adapter);
2160
2161         /* remove VID from filter table*/
2162
2163         index = (vid >> 5) & 0x7F;
2164         vfta = IXGB_READ_REG_ARRAY(&adapter->hw, VFTA, index);
2165         vfta &= ~(1 << (vid & 0x1F));
2166         ixgb_write_vfta(&adapter->hw, index, vfta);
2167 }
2168
2169 static void
2170 ixgb_restore_vlan(struct ixgb_adapter *adapter)
2171 {
2172         ixgb_vlan_rx_register(adapter->netdev, adapter->vlgrp);
2173
2174         if(adapter->vlgrp) {
2175                 uint16_t vid;
2176                 for(vid = 0; vid < VLAN_GROUP_ARRAY_LEN; vid++) {
2177                         if(!adapter->vlgrp->vlan_devices[vid])
2178                                 continue;
2179                         ixgb_vlan_rx_add_vid(adapter->netdev, vid);
2180                 }
2181         }
2182 }
2183
2184 #ifdef CONFIG_NET_POLL_CONTROLLER
2185 /*
2186  * Polling 'interrupt' - used by things like netconsole to send skbs
2187  * without having to re-enable interrupts. It's not called while
2188  * the interrupt routine is executing.
2189  */
2190
2191 static void ixgb_netpoll(struct net_device *dev)
2192 {
2193         struct ixgb_adapter *adapter = dev->priv;
2194
2195         disable_irq(adapter->pdev->irq);
2196         ixgb_intr(adapter->pdev->irq, dev, NULL);
2197         enable_irq(adapter->pdev->irq);
2198 }
2199 #endif
2200
2201 /* ixgb_main.c */