err.no Git - linux-2.6/blob - drivers/net/ixgb/ixgb_main.c

   1 /*******************************************************************************
   2
   3
   4   Copyright(c) 1999 - 2005 Intel Corporation. All rights reserved.
   5
   6   This program is free software; you can redistribute it and/or modify it
   7   under the terms of the GNU General Public License as published by the Free
   8   Software Foundation; either version 2 of the License, or (at your option)
   9   any later version.
  10
  11   This program is distributed in the hope that it will be useful, but WITHOUT
  12   ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13   FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  14   more details.
  15
  16   You should have received a copy of the GNU General Public License along with
  17   this program; if not, write to the Free Software Foundation, Inc., 59
  18   Temple Place - Suite 330, Boston, MA  02111-1307, USA.
  19
  20   The full GNU General Public License is included in this distribution in the
  21   file called LICENSE.
  22
  23   Contact Information:
  24   Linux NICS <linux.nics@intel.com>
  25   Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
  26
  27 *******************************************************************************/
  28
  29 #include "ixgb.h"
  30
  31 /* Change Log
  32  * 1.0.96 04/19/05
  33  * - Make needlessly global code static -- bunk@stusta.de
  34  * - ethtool cleanup -- shemminger@osdl.org
  35  * - Support for MODULE_VERSION -- linville@tuxdriver.com
  36  * - add skb_header_cloned check to the tso path -- herbert@apana.org.au
  37  * 1.0.88 01/05/05
  38  * - include fix to the condition that determines when to quit NAPI - Robert Olsson
  39  * - use netif_poll_{disable/enable} to synchronize between NAPI and i/f up/down
  40  * 1.0.84 10/26/04
  41  * - reset buffer_info->dma in Tx resource cleanup logic
  42  * 1.0.83 10/12/04
  43  * - sparse cleanup - shemminger@osdl.org
  44  * - fix tx resource cleanup logic
  45  */
  46
  47 char ixgb_driver_name[] = "ixgb";
  48 static char ixgb_driver_string[] = "Intel(R) PRO/10GbE Network Driver";
  49
  50 #ifndef CONFIG_IXGB_NAPI
  51 #define DRIVERNAPI
  52 #else
  53 #define DRIVERNAPI "-NAPI"
  54 #endif
  55 #define DRV_VERSION             "1.0.100-k2"DRIVERNAPI
  56 char ixgb_driver_version[] = DRV_VERSION;
  57 static char ixgb_copyright[] = "Copyright (c) 1999-2005 Intel Corporation.";
  58
  59 /* ixgb_pci_tbl - PCI Device ID Table
  60  *
  61  * Wildcard entries (PCI_ANY_ID) should come last
  62  * Last entry must be all 0s
  63  *
  64  * { Vendor ID, Device ID, SubVendor ID, SubDevice ID,
  65  *   Class, Class Mask, private data (not used) }
  66  */
  67 static struct pci_device_id ixgb_pci_tbl[] = {
  68         {INTEL_VENDOR_ID, IXGB_DEVICE_ID_82597EX,
  69          PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
  70         {INTEL_VENDOR_ID, IXGB_DEVICE_ID_82597EX_CX4,
  71          PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
  72         {INTEL_VENDOR_ID, IXGB_DEVICE_ID_82597EX_SR,
  73          PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
  74         {INTEL_VENDOR_ID, IXGB_DEVICE_ID_82597EX_LR,
  75          PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
  76
  77         /* required last entry */
  78         {0,}
  79 };
  80
  81 MODULE_DEVICE_TABLE(pci, ixgb_pci_tbl);
  82
  83 /* Local Function Prototypes */
  84
  85 int ixgb_up(struct ixgb_adapter *adapter);
  86 void ixgb_down(struct ixgb_adapter *adapter, boolean_t kill_watchdog);
  87 void ixgb_reset(struct ixgb_adapter *adapter);
  88 int ixgb_setup_tx_resources(struct ixgb_adapter *adapter);
  89 int ixgb_setup_rx_resources(struct ixgb_adapter *adapter);
  90 void ixgb_free_tx_resources(struct ixgb_adapter *adapter);
  91 void ixgb_free_rx_resources(struct ixgb_adapter *adapter);
  92 void ixgb_update_stats(struct ixgb_adapter *adapter);
  93
  94 static int ixgb_init_module(void);
  95 static void ixgb_exit_module(void);
  96 static int ixgb_probe(struct pci_dev *pdev, const struct pci_device_id *ent);
  97 static void __devexit ixgb_remove(struct pci_dev *pdev);
  98 static int ixgb_sw_init(struct ixgb_adapter *adapter);
  99 static int ixgb_open(struct net_device *netdev);
 100 static int ixgb_close(struct net_device *netdev);
 101 static void ixgb_configure_tx(struct ixgb_adapter *adapter);
 102 static void ixgb_configure_rx(struct ixgb_adapter *adapter);
 103 static void ixgb_setup_rctl(struct ixgb_adapter *adapter);
 104 static void ixgb_clean_tx_ring(struct ixgb_adapter *adapter);
 105 static void ixgb_clean_rx_ring(struct ixgb_adapter *adapter);
 106 static void ixgb_set_multi(struct net_device *netdev);
 107 static void ixgb_watchdog(unsigned long data);
 108 static int ixgb_xmit_frame(struct sk_buff *skb, struct net_device *netdev);
 109 static struct net_device_stats *ixgb_get_stats(struct net_device *netdev);
 110 static int ixgb_change_mtu(struct net_device *netdev, int new_mtu);
 111 static int ixgb_set_mac(struct net_device *netdev, void *p);
 112 static irqreturn_t ixgb_intr(int irq, void *data, struct pt_regs *regs);
 113 static boolean_t ixgb_clean_tx_irq(struct ixgb_adapter *adapter);
 114
 115 #ifdef CONFIG_IXGB_NAPI
 116 static int ixgb_clean(struct net_device *netdev, int *budget);
 117 static boolean_t ixgb_clean_rx_irq(struct ixgb_adapter *adapter,
 118                                    int *work_done, int work_to_do);
 119 #else
 120 static boolean_t ixgb_clean_rx_irq(struct ixgb_adapter *adapter);
 121 #endif
 122 static void ixgb_alloc_rx_buffers(struct ixgb_adapter *adapter);
 123 void ixgb_set_ethtool_ops(struct net_device *netdev);
 124 static void ixgb_tx_timeout(struct net_device *dev);
 125 static void ixgb_tx_timeout_task(struct net_device *dev);
 126 static void ixgb_vlan_rx_register(struct net_device *netdev,
 127                                   struct vlan_group *grp);
 128 static void ixgb_vlan_rx_add_vid(struct net_device *netdev, uint16_t vid);
 129 static void ixgb_vlan_rx_kill_vid(struct net_device *netdev, uint16_t vid);
 130 static void ixgb_restore_vlan(struct ixgb_adapter *adapter);
 131
 132 #ifdef CONFIG_NET_POLL_CONTROLLER
 133 /* for netdump / net console */
 134 static void ixgb_netpoll(struct net_device *dev);
 135 #endif
 136
 137 /* Exported from other modules */
 138
 139 extern void ixgb_check_options(struct ixgb_adapter *adapter);
 140
 141 static struct pci_driver ixgb_driver = {
 142         .name     = ixgb_driver_name,
 143         .id_table = ixgb_pci_tbl,
 144         .probe    = ixgb_probe,
 145         .remove   = __devexit_p(ixgb_remove),
 146 };
 147
 148 MODULE_AUTHOR("Intel Corporation, <linux.nics@intel.com>");
 149 MODULE_DESCRIPTION("Intel(R) PRO/10GbE Network Driver");
 150 MODULE_LICENSE("GPL");
 151 MODULE_VERSION(DRV_VERSION);
 152
 153 #define DEFAULT_DEBUG_LEVEL_SHIFT 3
 154 static int debug = DEFAULT_DEBUG_LEVEL_SHIFT;
 155 module_param(debug, int, 0);
 156 MODULE_PARM_DESC(debug, "Debug level (0=none,...,16=all)");
 157
 158 /* some defines for controlling descriptor fetches in h/w */
 159 #define RXDCTL_WTHRESH_DEFAULT 16       /* chip writes back at this many or RXT0 */
 160 #define RXDCTL_PTHRESH_DEFAULT 0                /* chip considers prefech below
 161                                                  * this */
 162 #define RXDCTL_HTHRESH_DEFAULT 0                /* chip will only prefetch if tail
 163                                                  * is pushed this many descriptors
 164                                                  * from head */
 165
 166 /**
 167  * ixgb_init_module - Driver Registration Routine
 168  *
 169  * ixgb_init_module is the first routine called when the driver is
 170  * loaded. All it does is register with the PCI subsystem.
 171  **/
 172
 173 static int __init
 174 ixgb_init_module(void)
 175 {
 176         printk(KERN_INFO "%s - version %s\n",
 177                ixgb_driver_string, ixgb_driver_version);
 178
 179         printk(KERN_INFO "%s\n", ixgb_copyright);
 180
 181         return pci_module_init(&ixgb_driver);
 182 }
 183
 184 module_init(ixgb_init_module);
 185
 186 /**
 187  * ixgb_exit_module - Driver Exit Cleanup Routine
 188  *
 189  * ixgb_exit_module is called just before the driver is removed
 190  * from memory.
 191  **/
 192
 193 static void __exit
 194 ixgb_exit_module(void)
 195 {
 196         pci_unregister_driver(&ixgb_driver);
 197 }
 198
 199 module_exit(ixgb_exit_module);
 200
 201 /**
 202  * ixgb_irq_disable - Mask off interrupt generation on the NIC
 203  * @adapter: board private structure
 204  **/
 205
 206 static inline void
 207 ixgb_irq_disable(struct ixgb_adapter *adapter)
 208 {
 209         atomic_inc(&adapter->irq_sem);
 210         IXGB_WRITE_REG(&adapter->hw, IMC, ~0);
 211         IXGB_WRITE_FLUSH(&adapter->hw);
 212         synchronize_irq(adapter->pdev->irq);
 213 }
 214
 215 /**
 216  * ixgb_irq_enable - Enable default interrupt generation settings
 217  * @adapter: board private structure
 218  **/
 219
 220 static inline void
 221 ixgb_irq_enable(struct ixgb_adapter *adapter)
 222 {
 223         if(atomic_dec_and_test(&adapter->irq_sem)) {
 224                 IXGB_WRITE_REG(&adapter->hw, IMS,
 225                                IXGB_INT_RXT0 | IXGB_INT_RXDMT0 | IXGB_INT_TXDW |
 226                                IXGB_INT_LSC);
 227                 IXGB_WRITE_FLUSH(&adapter->hw);
 228         }
 229 }
 230
 231 int
 232 ixgb_up(struct ixgb_adapter *adapter)
 233 {
 234         struct net_device *netdev = adapter->netdev;
 235         int err;
 236         int max_frame = netdev->mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;
 237         struct ixgb_hw *hw = &adapter->hw;
 238
 239         /* hardware has been reset, we need to reload some things */
 240
 241         ixgb_set_multi(netdev);
 242
 243         ixgb_restore_vlan(adapter);
 244
 245         ixgb_configure_tx(adapter);
 246         ixgb_setup_rctl(adapter);
 247         ixgb_configure_rx(adapter);
 248         ixgb_alloc_rx_buffers(adapter);
 249
 250 #ifdef CONFIG_PCI_MSI
 251         {
 252         boolean_t pcix = (IXGB_READ_REG(&adapter->hw, STATUS) &
 253                                                   IXGB_STATUS_PCIX_MODE) ? TRUE : FALSE;
 254         adapter->have_msi = TRUE;
 255
 256         if (!pcix)
 257            adapter->have_msi = FALSE;
 258         else if((err = pci_enable_msi(adapter->pdev))) {
 259                 DPRINTK(PROBE, ERR,
 260                  "Unable to allocate MSI interrupt Error: %d\n", err);
 261                 adapter->have_msi = FALSE;
 262                 /* proceed to try to request regular interrupt */
 263         }
 264         }
 265
 266 #endif
 267         if((err = request_irq(adapter->pdev->irq, &ixgb_intr,
 268                                   SA_SHIRQ | SA_SAMPLE_RANDOM,
 269                                   netdev->name, netdev))) {
 270                 DPRINTK(PROBE, ERR,
 271                  "Unable to allocate interrupt Error: %d\n", err);
 272                 return err;
 273         }
 274
 275         /* disable interrupts and get the hardware into a known state */
 276         IXGB_WRITE_REG(&adapter->hw, IMC, 0xffffffff);
 277
 278         if((hw->max_frame_size != max_frame) ||
 279                 (hw->max_frame_size !=
 280                 (IXGB_READ_REG(hw, MFS) >> IXGB_MFS_SHIFT))) {
 281
 282                 hw->max_frame_size = max_frame;
 283
 284                 IXGB_WRITE_REG(hw, MFS, hw->max_frame_size << IXGB_MFS_SHIFT);
 285
 286                 if(hw->max_frame_size >
 287                    IXGB_MAX_ENET_FRAME_SIZE_WITHOUT_FCS + ENET_FCS_LENGTH) {
 288                         uint32_t ctrl0 = IXGB_READ_REG(hw, CTRL0);
 289
 290                         if(!(ctrl0 & IXGB_CTRL0_JFE)) {
 291                                 ctrl0 |= IXGB_CTRL0_JFE;
 292                                 IXGB_WRITE_REG(hw, CTRL0, ctrl0);
 293                         }
 294                 }
 295         }
 296
 297         mod_timer(&adapter->watchdog_timer, jiffies);
 298         ixgb_irq_enable(adapter);
 299
 300 #ifdef CONFIG_IXGB_NAPI
 301         netif_poll_enable(netdev);
 302 #endif
 303         return 0;
 304 }
 305
 306 void
 307 ixgb_down(struct ixgb_adapter *adapter, boolean_t kill_watchdog)
 308 {
 309         struct net_device *netdev = adapter->netdev;
 310
 311         ixgb_irq_disable(adapter);
 312         free_irq(adapter->pdev->irq, netdev);
 313 #ifdef CONFIG_PCI_MSI
 314         if(adapter->have_msi == TRUE)
 315                 pci_disable_msi(adapter->pdev);
 316
 317 #endif
 318         if(kill_watchdog)
 319                 del_timer_sync(&adapter->watchdog_timer);
 320 #ifdef CONFIG_IXGB_NAPI
 321         netif_poll_disable(netdev);
 322 #endif
 323         adapter->link_speed = 0;
 324         adapter->link_duplex = 0;
 325         netif_carrier_off(netdev);
 326         netif_stop_queue(netdev);
 327
 328         ixgb_reset(adapter);
 329         ixgb_clean_tx_ring(adapter);
 330         ixgb_clean_rx_ring(adapter);
 331 }
 332
 333 void
 334 ixgb_reset(struct ixgb_adapter *adapter)
 335 {
 336
 337         ixgb_adapter_stop(&adapter->hw);
 338         if(!ixgb_init_hw(&adapter->hw))
 339                 DPRINTK(PROBE, ERR, "ixgb_init_hw failed.\n");
 340 }
 341
 342 /**
 343  * ixgb_probe - Device Initialization Routine
 344  * @pdev: PCI device information struct
 345  * @ent: entry in ixgb_pci_tbl
 346  *
 347  * Returns 0 on success, negative on failure
 348  *
 349  * ixgb_probe initializes an adapter identified by a pci_dev structure.
 350  * The OS initialization, configuring of the adapter private structure,
 351  * and a hardware reset occur.
 352  **/
 353
 354 static int __devinit
 355 ixgb_probe(struct pci_dev *pdev,
 356                 const struct pci_device_id *ent)
 357 {
 358         struct net_device *netdev = NULL;
 359         struct ixgb_adapter *adapter;
 360         static int cards_found = 0;
 361         unsigned long mmio_start;
 362         int mmio_len;
 363         int pci_using_dac;
 364         int i;
 365         int err;
 366
 367         if((err = pci_enable_device(pdev)))
 368                 return err;
 369
 370         if(!(err = pci_set_dma_mask(pdev, DMA_64BIT_MASK)) &&
 371            !(err = pci_set_consistent_dma_mask(pdev, DMA_64BIT_MASK))) {
 372                 pci_using_dac = 1;
 373         } else {
 374                 if((err = pci_set_dma_mask(pdev, DMA_32BIT_MASK)) ||
 375                    (err = pci_set_consistent_dma_mask(pdev, DMA_32BIT_MASK))) {
 376                         printk(KERN_ERR
 377                          "ixgb: No usable DMA configuration, aborting\n");
 378                         goto err_dma_mask;
 379                 }
 380                 pci_using_dac = 0;
 381         }
 382
 383         if((err = pci_request_regions(pdev, ixgb_driver_name)))
 384                 goto err_request_regions;
 385
 386         pci_set_master(pdev);
 387
 388         netdev = alloc_etherdev(sizeof(struct ixgb_adapter));
 389         if(!netdev) {
 390                 err = -ENOMEM;
 391                 goto err_alloc_etherdev;
 392         }
 393
 394         SET_MODULE_OWNER(netdev);
 395         SET_NETDEV_DEV(netdev, &pdev->dev);
 396
 397         pci_set_drvdata(pdev, netdev);
 398         adapter = netdev_priv(netdev);
 399         adapter->netdev = netdev;
 400         adapter->pdev = pdev;
 401         adapter->hw.back = adapter;
 402         adapter->msg_enable = netif_msg_init(debug, DEFAULT_DEBUG_LEVEL_SHIFT);
 403
 404         mmio_start = pci_resource_start(pdev, BAR_0);
 405         mmio_len = pci_resource_len(pdev, BAR_0);
 406
 407         adapter->hw.hw_addr = ioremap(mmio_start, mmio_len);
 408         if(!adapter->hw.hw_addr) {
 409                 err = -EIO;
 410                 goto err_ioremap;
 411         }
 412
 413         for(i = BAR_1; i <= BAR_5; i++) {
 414                 if(pci_resource_len(pdev, i) == 0)
 415                         continue;
 416                 if(pci_resource_flags(pdev, i) & IORESOURCE_IO) {
 417                         adapter->hw.io_base = pci_resource_start(pdev, i);
 418                         break;
 419                 }
 420         }
 421
 422         netdev->open = &ixgb_open;
 423         netdev->stop = &ixgb_close;
 424         netdev->hard_start_xmit = &ixgb_xmit_frame;
 425         netdev->get_stats = &ixgb_get_stats;
 426         netdev->set_multicast_list = &ixgb_set_multi;
 427         netdev->set_mac_address = &ixgb_set_mac;
 428         netdev->change_mtu = &ixgb_change_mtu;
 429         ixgb_set_ethtool_ops(netdev);
 430         netdev->tx_timeout = &ixgb_tx_timeout;
 431         netdev->watchdog_timeo = HZ;
 432 #ifdef CONFIG_IXGB_NAPI
 433         netdev->poll = &ixgb_clean;
 434         netdev->weight = 64;
 435 #endif
 436         netdev->vlan_rx_register = ixgb_vlan_rx_register;
 437         netdev->vlan_rx_add_vid = ixgb_vlan_rx_add_vid;
 438         netdev->vlan_rx_kill_vid = ixgb_vlan_rx_kill_vid;
 439 #ifdef CONFIG_NET_POLL_CONTROLLER
 440         netdev->poll_controller = ixgb_netpoll;
 441 #endif
 442
 443         strcpy(netdev->name, pci_name(pdev));
 444         netdev->mem_start = mmio_start;
 445         netdev->mem_end = mmio_start + mmio_len;
 446         netdev->base_addr = adapter->hw.io_base;
 447
 448         adapter->bd_number = cards_found;
 449         adapter->link_speed = 0;
 450         adapter->link_duplex = 0;
 451
 452         /* setup the private structure */
 453
 454         if((err = ixgb_sw_init(adapter)))
 455                 goto err_sw_init;
 456
 457         netdev->features = NETIF_F_SG |
 458                            NETIF_F_HW_CSUM |
 459                            NETIF_F_HW_VLAN_TX |
 460                            NETIF_F_HW_VLAN_RX |
 461                            NETIF_F_HW_VLAN_FILTER;
 462 #ifdef NETIF_F_TSO
 463         netdev->features |= NETIF_F_TSO;
 464 #endif
 465 #ifdef NETIF_F_LLTX
 466         netdev->features |= NETIF_F_LLTX;
 467 #endif
 468
 469         if(pci_using_dac)
 470                 netdev->features |= NETIF_F_HIGHDMA;
 471
 472         /* make sure the EEPROM is good */
 473
 474         if(!ixgb_validate_eeprom_checksum(&adapter->hw)) {
 475                 DPRINTK(PROBE, ERR, "The EEPROM Checksum Is Not Valid\n");
 476                 err = -EIO;
 477                 goto err_eeprom;
 478         }
 479
 480         ixgb_get_ee_mac_addr(&adapter->hw, netdev->dev_addr);
 481         memcpy(netdev->perm_addr, netdev->dev_addr, netdev->addr_len);
 482
 483         if(!is_valid_ether_addr(netdev->perm_addr)) {
 484                 DPRINTK(PROBE, ERR, "Invalid MAC Address\n");
 485                 err = -EIO;
 486                 goto err_eeprom;
 487         }
 488
 489         adapter->part_num = ixgb_get_ee_pba_number(&adapter->hw);
 490
 491         init_timer(&adapter->watchdog_timer);
 492         adapter->watchdog_timer.function = &ixgb_watchdog;
 493         adapter->watchdog_timer.data = (unsigned long)adapter;
 494
 495         INIT_WORK(&adapter->tx_timeout_task,
 496                   (void (*)(void *))ixgb_tx_timeout_task, netdev);
 497
 498         strcpy(netdev->name, "eth%d");
 499         if((err = register_netdev(netdev)))
 500                 goto err_register;
 501
 502         /* we're going to reset, so assume we have no link for now */
 503
 504         netif_carrier_off(netdev);
 505         netif_stop_queue(netdev);
 506
 507         DPRINTK(PROBE, INFO, "Intel(R) PRO/10GbE Network Connection\n");
 508         ixgb_check_options(adapter);
 509         /* reset the hardware with the new settings */
 510
 511         ixgb_reset(adapter);
 512
 513         cards_found++;
 514         return 0;
 515
 516 err_register:
 517 err_sw_init:
 518 err_eeprom:
 519         iounmap(adapter->hw.hw_addr);
 520 err_ioremap:
 521         free_netdev(netdev);
 522 err_alloc_etherdev:
 523         pci_release_regions(pdev);
 524 err_request_regions:
 525 err_dma_mask:
 526         pci_disable_device(pdev);
 527         return err;
 528 }
 529
 530 /**
 531  * ixgb_remove - Device Removal Routine
 532  * @pdev: PCI device information struct
 533  *
 534  * ixgb_remove is called by the PCI subsystem to alert the driver
 535  * that it should release a PCI device.  The could be caused by a
 536  * Hot-Plug event, or because the driver is going to be removed from
 537  * memory.
 538  **/
 539
 540 static void __devexit
 541 ixgb_remove(struct pci_dev *pdev)
 542 {
 543         struct net_device *netdev = pci_get_drvdata(pdev);
 544         struct ixgb_adapter *adapter = netdev_priv(netdev);
 545
 546         unregister_netdev(netdev);
 547
 548         iounmap(adapter->hw.hw_addr);
 549         pci_release_regions(pdev);
 550
 551         free_netdev(netdev);
 552 }
 553
 554 /**
 555  * ixgb_sw_init - Initialize general software structures (struct ixgb_adapter)
 556  * @adapter: board private structure to initialize
 557  *
 558  * ixgb_sw_init initializes the Adapter private data structure.
 559  * Fields are initialized based on PCI device information and
 560  * OS network device settings (MTU size).
 561  **/
 562
 563 static int __devinit
 564 ixgb_sw_init(struct ixgb_adapter *adapter)
 565 {
 566         struct ixgb_hw *hw = &adapter->hw;
 567         struct net_device *netdev = adapter->netdev;
 568         struct pci_dev *pdev = adapter->pdev;
 569
 570         /* PCI config space info */
 571
 572         hw->vendor_id = pdev->vendor;
 573         hw->device_id = pdev->device;
 574         hw->subsystem_vendor_id = pdev->subsystem_vendor;
 575         hw->subsystem_id = pdev->subsystem_device;
 576
 577         adapter->rx_buffer_len = IXGB_RXBUFFER_2048;
 578
 579         hw->max_frame_size = netdev->mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;
 580
 581         if((hw->device_id == IXGB_DEVICE_ID_82597EX)
 582            || (hw->device_id == IXGB_DEVICE_ID_82597EX_CX4)
 583            || (hw->device_id == IXGB_DEVICE_ID_82597EX_LR)
 584            || (hw->device_id == IXGB_DEVICE_ID_82597EX_SR))
 585                         hw->mac_type = ixgb_82597;
 586         else {
 587                 /* should never have loaded on this device */
 588                 DPRINTK(PROBE, ERR, "unsupported device id\n");
 589         }
 590
 591         /* enable flow control to be programmed */
 592         hw->fc.send_xon = 1;
 593
 594         atomic_set(&adapter->irq_sem, 1);
 595         spin_lock_init(&adapter->tx_lock);
 596
 597         return 0;
 598 }
 599
 600 /**
 601  * ixgb_open - Called when a network interface is made active
 602  * @netdev: network interface device structure
 603  *
 604  * Returns 0 on success, negative value on failure
 605  *
 606  * The open entry point is called when a network interface is made
 607  * active by the system (IFF_UP).  At this point all resources needed
 608  * for transmit and receive operations are allocated, the interrupt
 609  * handler is registered with the OS, the watchdog timer is started,
 610  * and the stack is notified that the interface is ready.
 611  **/
 612
 613 static int
 614 ixgb_open(struct net_device *netdev)
 615 {
 616         struct ixgb_adapter *adapter = netdev_priv(netdev);
 617         int err;
 618
 619         /* allocate transmit descriptors */
 620
 621         if((err = ixgb_setup_tx_resources(adapter)))
 622                 goto err_setup_tx;
 623
 624         /* allocate receive descriptors */
 625
 626         if((err = ixgb_setup_rx_resources(adapter)))
 627                 goto err_setup_rx;
 628
 629         if((err = ixgb_up(adapter)))
 630                 goto err_up;
 631
 632         return 0;
 633
 634 err_up:
 635         ixgb_free_rx_resources(adapter);
 636 err_setup_rx:
 637         ixgb_free_tx_resources(adapter);
 638 err_setup_tx:
 639         ixgb_reset(adapter);
 640
 641         return err;
 642 }
 643
 644 /**
 645  * ixgb_close - Disables a network interface
 646  * @netdev: network interface device structure
 647  *
 648  * Returns 0, this is not allowed to fail
 649  *
 650  * The close entry point is called when an interface is de-activated
 651  * by the OS.  The hardware is still under the drivers control, but
 652  * needs to be disabled.  A global MAC reset is issued to stop the
 653  * hardware, and all transmit and receive resources are freed.
 654  **/
 655
 656 static int
 657 ixgb_close(struct net_device *netdev)
 658 {
 659         struct ixgb_adapter *adapter = netdev_priv(netdev);
 660
 661         ixgb_down(adapter, TRUE);
 662
 663         ixgb_free_tx_resources(adapter);
 664         ixgb_free_rx_resources(adapter);
 665
 666         return 0;
 667 }
 668
 669 /**
 670  * ixgb_setup_tx_resources - allocate Tx resources (Descriptors)
 671  * @adapter: board private structure
 672  *
 673  * Return 0 on success, negative on failure
 674  **/
 675
 676 int
 677 ixgb_setup_tx_resources(struct ixgb_adapter *adapter)
 678 {
 679         struct ixgb_desc_ring *txdr = &adapter->tx_ring;
 680         struct pci_dev *pdev = adapter->pdev;
 681         int size;
 682
 683         size = sizeof(struct ixgb_buffer) * txdr->count;
 684         txdr->buffer_info = vmalloc(size);
 685         if(!txdr->buffer_info) {
 686                 DPRINTK(PROBE, ERR,
 687                  "Unable to allocate transmit descriptor ring memory\n");
 688                 return -ENOMEM;
 689         }
 690         memset(txdr->buffer_info, 0, size);
 691
 692         /* round up to nearest 4K */
 693
 694         txdr->size = txdr->count * sizeof(struct ixgb_tx_desc);
 695         IXGB_ROUNDUP(txdr->size, 4096);
 696
 697         txdr->desc = pci_alloc_consistent(pdev, txdr->size, &txdr->dma);
 698         if(!txdr->desc) {
 699                 vfree(txdr->buffer_info);
 700                 DPRINTK(PROBE, ERR,
 701                  "Unable to allocate transmit descriptor memory\n");
 702                 return -ENOMEM;
 703         }
 704         memset(txdr->desc, 0, txdr->size);
 705
 706         txdr->next_to_use = 0;
 707         txdr->next_to_clean = 0;
 708
 709         return 0;
 710 }
 711
 712 /**
 713  * ixgb_configure_tx - Configure 82597 Transmit Unit after Reset.
 714  * @adapter: board private structure
 715  *
 716  * Configure the Tx unit of the MAC after a reset.
 717  **/
 718
 719 static void
 720 ixgb_configure_tx(struct ixgb_adapter *adapter)
 721 {
 722         uint64_t tdba = adapter->tx_ring.dma;
 723         uint32_t tdlen = adapter->tx_ring.count * sizeof(struct ixgb_tx_desc);
 724         uint32_t tctl;
 725         struct ixgb_hw *hw = &adapter->hw;
 726
 727         /* Setup the Base and Length of the Tx Descriptor Ring
 728          * tx_ring.dma can be either a 32 or 64 bit value
 729          */
 730
 731         IXGB_WRITE_REG(hw, TDBAL, (tdba & 0x00000000ffffffffULL));
 732         IXGB_WRITE_REG(hw, TDBAH, (tdba >> 32));
 733
 734         IXGB_WRITE_REG(hw, TDLEN, tdlen);
 735
 736         /* Setup the HW Tx Head and Tail descriptor pointers */
 737
 738         IXGB_WRITE_REG(hw, TDH, 0);
 739         IXGB_WRITE_REG(hw, TDT, 0);
 740
 741         /* don't set up txdctl, it induces performance problems if configured
 742          * incorrectly */
 743         /* Set the Tx Interrupt Delay register */
 744
 745         IXGB_WRITE_REG(hw, TIDV, adapter->tx_int_delay);
 746
 747         /* Program the Transmit Control Register */
 748
 749         tctl = IXGB_TCTL_TCE | IXGB_TCTL_TXEN | IXGB_TCTL_TPDE;
 750         IXGB_WRITE_REG(hw, TCTL, tctl);
 751
 752         /* Setup Transmit Descriptor Settings for this adapter */
 753         adapter->tx_cmd_type =
 754                 IXGB_TX_DESC_TYPE
 755                 | (adapter->tx_int_delay_enable ? IXGB_TX_DESC_CMD_IDE : 0);
 756 }
 757
 758 /**
 759  * ixgb_setup_rx_resources - allocate Rx resources (Descriptors)
 760  * @adapter: board private structure
 761  *
 762  * Returns 0 on success, negative on failure
 763  **/
 764
 765 int
 766 ixgb_setup_rx_resources(struct ixgb_adapter *adapter)
 767 {
 768         struct ixgb_desc_ring *rxdr = &adapter->rx_ring;
 769         struct pci_dev *pdev = adapter->pdev;
 770         int size;
 771
 772         size = sizeof(struct ixgb_buffer) * rxdr->count;
 773         rxdr->buffer_info = vmalloc(size);
 774         if(!rxdr->buffer_info) {
 775                 DPRINTK(PROBE, ERR,
 776                  "Unable to allocate receive descriptor ring\n");
 777                 return -ENOMEM;
 778         }
 779         memset(rxdr->buffer_info, 0, size);
 780
 781         /* Round up to nearest 4K */
 782
 783         rxdr->size = rxdr->count * sizeof(struct ixgb_rx_desc);
 784         IXGB_ROUNDUP(rxdr->size, 4096);
 785
 786         rxdr->desc = pci_alloc_consistent(pdev, rxdr->size, &rxdr->dma);
 787
 788         if(!rxdr->desc) {
 789                 vfree(rxdr->buffer_info);
 790                 DPRINTK(PROBE, ERR,
 791                  "Unable to allocate receive descriptors\n");
 792                 return -ENOMEM;
 793         }
 794         memset(rxdr->desc, 0, rxdr->size);
 795
 796         rxdr->next_to_clean = 0;
 797         rxdr->next_to_use = 0;
 798
 799         return 0;
 800 }
 801
 802 /**
 803  * ixgb_setup_rctl - configure the receive control register
 804  * @adapter: Board private structure
 805  **/
 806
 807 static void
 808 ixgb_setup_rctl(struct ixgb_adapter *adapter)
 809 {
 810         uint32_t rctl;
 811
 812         rctl = IXGB_READ_REG(&adapter->hw, RCTL);
 813
 814         rctl &= ~(3 << IXGB_RCTL_MO_SHIFT);
 815
 816         rctl |=
 817                 IXGB_RCTL_BAM | IXGB_RCTL_RDMTS_1_2 |
 818                 IXGB_RCTL_RXEN | IXGB_RCTL_CFF |
 819                 (adapter->hw.mc_filter_type << IXGB_RCTL_MO_SHIFT);
 820
 821         rctl |= IXGB_RCTL_SECRC;
 822
 823         switch (adapter->rx_buffer_len) {
 824         case IXGB_RXBUFFER_2048:
 825         default:
 826                 rctl |= IXGB_RCTL_BSIZE_2048;
 827                 break;
 828         case IXGB_RXBUFFER_4096:
 829                 rctl |= IXGB_RCTL_BSIZE_4096;
 830                 break;
 831         case IXGB_RXBUFFER_8192:
 832                 rctl |= IXGB_RCTL_BSIZE_8192;
 833                 break;
 834         case IXGB_RXBUFFER_16384:
 835                 rctl |= IXGB_RCTL_BSIZE_16384;
 836                 break;
 837         }
 838
 839         IXGB_WRITE_REG(&adapter->hw, RCTL, rctl);
 840 }
 841
 842 /**
 843  * ixgb_configure_rx - Configure 82597 Receive Unit after Reset.
 844  * @adapter: board private structure
 845  *
 846  * Configure the Rx unit of the MAC after a reset.
 847  **/
 848
 849 static void
 850 ixgb_configure_rx(struct ixgb_adapter *adapter)
 851 {
 852         uint64_t rdba = adapter->rx_ring.dma;
 853         uint32_t rdlen = adapter->rx_ring.count * sizeof(struct ixgb_rx_desc);
 854         struct ixgb_hw *hw = &adapter->hw;
 855         uint32_t rctl;
 856         uint32_t rxcsum;
 857         uint32_t rxdctl;
 858
 859         /* make sure receives are disabled while setting up the descriptors */
 860
 861         rctl = IXGB_READ_REG(hw, RCTL);
 862         IXGB_WRITE_REG(hw, RCTL, rctl & ~IXGB_RCTL_RXEN);
 863
 864         /* set the Receive Delay Timer Register */
 865
 866         IXGB_WRITE_REG(hw, RDTR, adapter->rx_int_delay);
 867
 868         /* Setup the Base and Length of the Rx Descriptor Ring */
 869
 870         IXGB_WRITE_REG(hw, RDBAL, (rdba & 0x00000000ffffffffULL));
 871         IXGB_WRITE_REG(hw, RDBAH, (rdba >> 32));
 872
 873         IXGB_WRITE_REG(hw, RDLEN, rdlen);
 874
 875         /* Setup the HW Rx Head and Tail Descriptor Pointers */
 876         IXGB_WRITE_REG(hw, RDH, 0);
 877         IXGB_WRITE_REG(hw, RDT, 0);
 878
 879         /* set up pre-fetching of receive buffers so we get some before we
 880          * run out (default hardware behavior is to run out before fetching
 881          * more).  This sets up to fetch if HTHRESH rx descriptors are avail
 882          * and the descriptors in hw cache are below PTHRESH.  This avoids
 883          * the hardware behavior of fetching <=512 descriptors in a single
 884          * burst that pre-empts all other activity, usually causing fifo
 885          * overflows. */
 886         /* use WTHRESH to burst write 16 descriptors or burst when RXT0 */
 887         rxdctl = RXDCTL_WTHRESH_DEFAULT << IXGB_RXDCTL_WTHRESH_SHIFT |
 888                  RXDCTL_HTHRESH_DEFAULT << IXGB_RXDCTL_HTHRESH_SHIFT |
 889                  RXDCTL_PTHRESH_DEFAULT << IXGB_RXDCTL_PTHRESH_SHIFT;
 890         IXGB_WRITE_REG(hw, RXDCTL, rxdctl);
 891
 892         /* Enable Receive Checksum Offload for TCP and UDP */
 893         if(adapter->rx_csum == TRUE) {
 894                 rxcsum = IXGB_READ_REG(hw, RXCSUM);
 895                 rxcsum |= IXGB_RXCSUM_TUOFL;
 896                 IXGB_WRITE_REG(hw, RXCSUM, rxcsum);
 897         }
 898
 899         /* Enable Receives */
 900
 901         IXGB_WRITE_REG(hw, RCTL, rctl);
 902 }
 903
 904 /**
 905  * ixgb_free_tx_resources - Free Tx Resources
 906  * @adapter: board private structure
 907  *
 908  * Free all transmit software resources
 909  **/
 910
 911 void
 912 ixgb_free_tx_resources(struct ixgb_adapter *adapter)
 913 {
 914         struct pci_dev *pdev = adapter->pdev;
 915
 916         ixgb_clean_tx_ring(adapter);
 917
 918         vfree(adapter->tx_ring.buffer_info);
 919         adapter->tx_ring.buffer_info = NULL;
 920
 921         pci_free_consistent(pdev, adapter->tx_ring.size,
 922                             adapter->tx_ring.desc, adapter->tx_ring.dma);
 923
 924         adapter->tx_ring.desc = NULL;
 925 }
 926
 927 static inline void
 928 ixgb_unmap_and_free_tx_resource(struct ixgb_adapter *adapter,
 929                                         struct ixgb_buffer *buffer_info)
 930 {
 931         struct pci_dev *pdev = adapter->pdev;
 932         if(buffer_info->dma) {
 933                 pci_unmap_page(pdev,
 934                            buffer_info->dma,
 935                            buffer_info->length,
 936                            PCI_DMA_TODEVICE);
 937                 buffer_info->dma = 0;
 938         }
 939         if(buffer_info->skb) {
 940                 dev_kfree_skb_any(buffer_info->skb);
 941                 buffer_info->skb = NULL;
 942         }
 943 }
 944
 945 /**
 946  * ixgb_clean_tx_ring - Free Tx Buffers
 947  * @adapter: board private structure
 948  **/
 949
 950 static void
 951 ixgb_clean_tx_ring(struct ixgb_adapter *adapter)
 952 {
 953         struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
 954         struct ixgb_buffer *buffer_info;
 955         unsigned long size;
 956         unsigned int i;
 957
 958         /* Free all the Tx ring sk_buffs */
 959
 960         for(i = 0; i < tx_ring->count; i++) {
 961                 buffer_info = &tx_ring->buffer_info[i];
 962                 ixgb_unmap_and_free_tx_resource(adapter, buffer_info);
 963         }
 964
 965         size = sizeof(struct ixgb_buffer) * tx_ring->count;
 966         memset(tx_ring->buffer_info, 0, size);
 967
 968         /* Zero out the descriptor ring */
 969
 970         memset(tx_ring->desc, 0, tx_ring->size);
 971
 972         tx_ring->next_to_use = 0;
 973         tx_ring->next_to_clean = 0;
 974
 975         IXGB_WRITE_REG(&adapter->hw, TDH, 0);
 976         IXGB_WRITE_REG(&adapter->hw, TDT, 0);
 977 }
 978
 979 /**
 980  * ixgb_free_rx_resources - Free Rx Resources
 981  * @adapter: board private structure
 982  *
 983  * Free all receive software resources
 984  **/
 985
 986 void
 987 ixgb_free_rx_resources(struct ixgb_adapter *adapter)
 988 {
 989         struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
 990         struct pci_dev *pdev = adapter->pdev;
 991
 992         ixgb_clean_rx_ring(adapter);
 993
 994         vfree(rx_ring->buffer_info);
 995         rx_ring->buffer_info = NULL;
 996
 997         pci_free_consistent(pdev, rx_ring->size, rx_ring->desc, rx_ring->dma);
 998
 999         rx_ring->desc = NULL;
1000 }
1001
1002 /**
1003  * ixgb_clean_rx_ring - Free Rx Buffers
1004  * @adapter: board private structure
1005  **/
1006
1007 static void
1008 ixgb_clean_rx_ring(struct ixgb_adapter *adapter)
1009 {
1010         struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
1011         struct ixgb_buffer *buffer_info;
1012         struct pci_dev *pdev = adapter->pdev;
1013         unsigned long size;
1014         unsigned int i;
1015
1016         /* Free all the Rx ring sk_buffs */
1017
1018         for(i = 0; i < rx_ring->count; i++) {
1019                 buffer_info = &rx_ring->buffer_info[i];
1020                 if(buffer_info->skb) {
1021
1022                         pci_unmap_single(pdev,
1023                                          buffer_info->dma,
1024                                          buffer_info->length,
1025                                          PCI_DMA_FROMDEVICE);
1026
1027                         dev_kfree_skb(buffer_info->skb);
1028
1029                         buffer_info->skb = NULL;
1030                 }
1031         }
1032
1033         size = sizeof(struct ixgb_buffer) * rx_ring->count;
1034         memset(rx_ring->buffer_info, 0, size);
1035
1036         /* Zero out the descriptor ring */
1037
1038         memset(rx_ring->desc, 0, rx_ring->size);
1039
1040         rx_ring->next_to_clean = 0;
1041         rx_ring->next_to_use = 0;
1042
1043         IXGB_WRITE_REG(&adapter->hw, RDH, 0);
1044         IXGB_WRITE_REG(&adapter->hw, RDT, 0);
1045 }
1046
1047 /**
1048  * ixgb_set_mac - Change the Ethernet Address of the NIC
1049  * @netdev: network interface device structure
1050  * @p: pointer to an address structure
1051  *
1052  * Returns 0 on success, negative on failure
1053  **/
1054
1055 static int
1056 ixgb_set_mac(struct net_device *netdev, void *p)
1057 {
1058         struct ixgb_adapter *adapter = netdev_priv(netdev);
1059         struct sockaddr *addr = p;
1060
1061         if(!is_valid_ether_addr(addr->sa_data))
1062                 return -EADDRNOTAVAIL;
1063
1064         memcpy(netdev->dev_addr, addr->sa_data, netdev->addr_len);
1065
1066         ixgb_rar_set(&adapter->hw, addr->sa_data, 0);
1067
1068         return 0;
1069 }
1070
1071 /**
1072  * ixgb_set_multi - Multicast and Promiscuous mode set
1073  * @netdev: network interface device structure
1074  *
1075  * The set_multi entry point is called whenever the multicast address
1076  * list or the network interface flags are updated.  This routine is
1077  * responsible for configuring the hardware for proper multicast,
1078  * promiscuous mode, and all-multi behavior.
1079  **/
1080
1081 static void
1082 ixgb_set_multi(struct net_device *netdev)
1083 {
1084         struct ixgb_adapter *adapter = netdev_priv(netdev);
1085         struct ixgb_hw *hw = &adapter->hw;
1086         struct dev_mc_list *mc_ptr;
1087         uint32_t rctl;
1088         int i;
1089
1090         /* Check for Promiscuous and All Multicast modes */
1091
1092         rctl = IXGB_READ_REG(hw, RCTL);
1093
1094         if(netdev->flags & IFF_PROMISC) {
1095                 rctl |= (IXGB_RCTL_UPE | IXGB_RCTL_MPE);
1096         } else if(netdev->flags & IFF_ALLMULTI) {
1097                 rctl |= IXGB_RCTL_MPE;
1098                 rctl &= ~IXGB_RCTL_UPE;
1099         } else {
1100                 rctl &= ~(IXGB_RCTL_UPE | IXGB_RCTL_MPE);
1101         }
1102
1103         if(netdev->mc_count > IXGB_MAX_NUM_MULTICAST_ADDRESSES) {
1104                 rctl |= IXGB_RCTL_MPE;
1105                 IXGB_WRITE_REG(hw, RCTL, rctl);
1106         } else {
1107                 uint8_t mta[netdev->mc_count * IXGB_ETH_LENGTH_OF_ADDRESS];
1108
1109                 IXGB_WRITE_REG(hw, RCTL, rctl);
1110
1111                 for(i = 0, mc_ptr = netdev->mc_list; mc_ptr;
1112                         i++, mc_ptr = mc_ptr->next)
1113                         memcpy(&mta[i * IXGB_ETH_LENGTH_OF_ADDRESS],
1114                                    mc_ptr->dmi_addr, IXGB_ETH_LENGTH_OF_ADDRESS);
1115
1116                 ixgb_mc_addr_list_update(hw, mta, netdev->mc_count, 0);
1117         }
1118 }
1119
1120 /**
1121  * ixgb_watchdog - Timer Call-back
1122  * @data: pointer to netdev cast into an unsigned long
1123  **/
1124
1125 static void
1126 ixgb_watchdog(unsigned long data)
1127 {
1128         struct ixgb_adapter *adapter = (struct ixgb_adapter *)data;
1129         struct net_device *netdev = adapter->netdev;
1130         struct ixgb_desc_ring *txdr = &adapter->tx_ring;
1131
1132         ixgb_check_for_link(&adapter->hw);
1133
1134         if (ixgb_check_for_bad_link(&adapter->hw)) {
1135                 /* force the reset path */
1136                 netif_stop_queue(netdev);
1137         }
1138
1139         if(adapter->hw.link_up) {
1140                 if(!netif_carrier_ok(netdev)) {
1141                         DPRINTK(LINK, INFO,
1142                                 "NIC Link is Up 10000 Mbps Full Duplex\n");
1143                         adapter->link_speed = 10000;
1144                         adapter->link_duplex = FULL_DUPLEX;
1145                         netif_carrier_on(netdev);
1146                         netif_wake_queue(netdev);
1147                 }
1148         } else {
1149                 if(netif_carrier_ok(netdev)) {
1150                         adapter->link_speed = 0;
1151                         adapter->link_duplex = 0;
1152                         DPRINTK(LINK, INFO, "NIC Link is Down\n");
1153                         netif_carrier_off(netdev);
1154                         netif_stop_queue(netdev);
1155
1156                 }
1157         }
1158
1159         ixgb_update_stats(adapter);
1160
1161         if(!netif_carrier_ok(netdev)) {
1162                 if(IXGB_DESC_UNUSED(txdr) + 1 < txdr->count) {
1163                         /* We've lost link, so the controller stops DMA,
1164                          * but we've got queued Tx work that's never going
1165                          * to get done, so reset controller to flush Tx.
1166                          * (Do the reset outside of interrupt context). */
1167                         schedule_work(&adapter->tx_timeout_task);
1168                 }
1169         }
1170
1171         /* Force detection of hung controller every watchdog period */
1172         adapter->detect_tx_hung = TRUE;
1173
1174         /* generate an interrupt to force clean up of any stragglers */
1175         IXGB_WRITE_REG(&adapter->hw, ICS, IXGB_INT_TXDW);
1176
1177         /* Reset the timer */
1178         mod_timer(&adapter->watchdog_timer, jiffies + 2 * HZ);
1179 }
1180
1181 #define IXGB_TX_FLAGS_CSUM              0x00000001
1182 #define IXGB_TX_FLAGS_VLAN              0x00000002
1183 #define IXGB_TX_FLAGS_TSO               0x00000004
1184
1185 static inline int
1186 ixgb_tso(struct ixgb_adapter *adapter, struct sk_buff *skb)
1187 {
1188 #ifdef NETIF_F_TSO
1189         struct ixgb_context_desc *context_desc;
1190         unsigned int i;
1191         uint8_t ipcss, ipcso, tucss, tucso, hdr_len;
1192         uint16_t ipcse, tucse, mss;
1193         int err;
1194
1195         if(likely(skb_shinfo(skb)->tso_size)) {
1196                 if (skb_header_cloned(skb)) {
1197                         err = pskb_expand_head(skb, 0, 0, GFP_ATOMIC);
1198                         if (err)
1199                                 return err;
1200                 }
1201
1202                 hdr_len = ((skb->h.raw - skb->data) + (skb->h.th->doff << 2));
1203                 mss = skb_shinfo(skb)->tso_size;
1204                 skb->nh.iph->tot_len = 0;
1205                 skb->nh.iph->check = 0;
1206                 skb->h.th->check = ~csum_tcpudp_magic(skb->nh.iph->saddr,
1207                                                       skb->nh.iph->daddr,
1208                                                       0, IPPROTO_TCP, 0);
1209                 ipcss = skb->nh.raw - skb->data;
1210                 ipcso = (void *)&(skb->nh.iph->check) - (void *)skb->data;
1211                 ipcse = skb->h.raw - skb->data - 1;
1212                 tucss = skb->h.raw - skb->data;
1213                 tucso = (void *)&(skb->h.th->check) - (void *)skb->data;
1214                 tucse = 0;
1215
1216                 i = adapter->tx_ring.next_to_use;
1217                 context_desc = IXGB_CONTEXT_DESC(adapter->tx_ring, i);
1218
1219                 context_desc->ipcss = ipcss;
1220                 context_desc->ipcso = ipcso;
1221                 context_desc->ipcse = cpu_to_le16(ipcse);
1222                 context_desc->tucss = tucss;
1223                 context_desc->tucso = tucso;
1224                 context_desc->tucse = cpu_to_le16(tucse);
1225                 context_desc->mss = cpu_to_le16(mss);
1226                 context_desc->hdr_len = hdr_len;
1227                 context_desc->status = 0;
1228                 context_desc->cmd_type_len = cpu_to_le32(
1229                                                   IXGB_CONTEXT_DESC_TYPE
1230                                                 | IXGB_CONTEXT_DESC_CMD_TSE
1231                                                 | IXGB_CONTEXT_DESC_CMD_IP
1232                                                 | IXGB_CONTEXT_DESC_CMD_TCP
1233                                                 | IXGB_CONTEXT_DESC_CMD_IDE
1234                                                 | (skb->len - (hdr_len)));
1235
1236
1237                 if(++i == adapter->tx_ring.count) i = 0;
1238                 adapter->tx_ring.next_to_use = i;
1239
1240                 return 1;
1241         }
1242 #endif
1243
1244         return 0;
1245 }
1246
1247 static inline boolean_t
1248 ixgb_tx_csum(struct ixgb_adapter *adapter, struct sk_buff *skb)
1249 {
1250         struct ixgb_context_desc *context_desc;
1251         unsigned int i;
1252         uint8_t css, cso;
1253
1254         if(likely(skb->ip_summed == CHECKSUM_HW)) {
1255                 css = skb->h.raw - skb->data;
1256                 cso = (skb->h.raw + skb->csum) - skb->data;
1257
1258                 i = adapter->tx_ring.next_to_use;
1259                 context_desc = IXGB_CONTEXT_DESC(adapter->tx_ring, i);
1260
1261                 context_desc->tucss = css;
1262                 context_desc->tucso = cso;
1263                 context_desc->tucse = 0;
1264                 /* zero out any previously existing data in one instruction */
1265                 *(uint32_t *)&(context_desc->ipcss) = 0;
1266                 context_desc->status = 0;
1267                 context_desc->hdr_len = 0;
1268                 context_desc->mss = 0;
1269                 context_desc->cmd_type_len =
1270                         cpu_to_le32(IXGB_CONTEXT_DESC_TYPE
1271                                     | IXGB_TX_DESC_CMD_IDE);
1272
1273                 if(++i == adapter->tx_ring.count) i = 0;
1274                 adapter->tx_ring.next_to_use = i;
1275
1276                 return TRUE;
1277         }
1278
1279         return FALSE;
1280 }
1281
1282 #define IXGB_MAX_TXD_PWR        14
1283 #define IXGB_MAX_DATA_PER_TXD   (1<<IXGB_MAX_TXD_PWR)
1284
1285 static inline int
1286 ixgb_tx_map(struct ixgb_adapter *adapter, struct sk_buff *skb,
1287             unsigned int first)
1288 {
1289         struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
1290         struct ixgb_buffer *buffer_info;
1291         int len = skb->len;
1292         unsigned int offset = 0, size, count = 0, i;
1293         unsigned int mss = skb_shinfo(skb)->tso_size;
1294
1295         unsigned int nr_frags = skb_shinfo(skb)->nr_frags;
1296         unsigned int f;
1297
1298         len -= skb->data_len;
1299
1300         i = tx_ring->next_to_use;
1301
1302         while(len) {
1303                 buffer_info = &tx_ring->buffer_info[i];
1304                 size = min(len, IXGB_MAX_JUMBO_FRAME_SIZE);
1305                 /* Workaround for premature desc write-backs
1306                  * in TSO mode.  Append 4-byte sentinel desc */
1307                 if(unlikely(mss && !nr_frags && size == len && size > 8))
1308                         size -= 4;
1309
1310                 buffer_info->length = size;
1311                 buffer_info->dma =
1312                         pci_map_single(adapter->pdev,
1313                                 skb->data + offset,
1314                                 size,
1315                                 PCI_DMA_TODEVICE);
1316                 buffer_info->time_stamp = jiffies;
1317
1318                 len -= size;
1319                 offset += size;
1320                 count++;
1321                 if(++i == tx_ring->count) i = 0;
1322         }
1323
1324         for(f = 0; f < nr_frags; f++) {
1325                 struct skb_frag_struct *frag;
1326
1327                 frag = &skb_shinfo(skb)->frags[f];
1328                 len = frag->size;
1329                 offset = 0;
1330
1331                 while(len) {
1332                         buffer_info = &tx_ring->buffer_info[i];
1333                         size = min(len, IXGB_MAX_JUMBO_FRAME_SIZE);
1334                         /* Workaround for premature desc write-backs
1335                          * in TSO mode.  Append 4-byte sentinel desc */
1336                         if(unlikely(mss && (f == (nr_frags-1)) && (size == len)
1337                                     && (size > 8)))
1338                                 size -= 4;
1339
1340                         buffer_info->length = size;
1341                         buffer_info->dma =
1342                                 pci_map_page(adapter->pdev,
1343                                         frag->page,
1344                                         frag->page_offset + offset,
1345                                         size,
1346                                         PCI_DMA_TODEVICE);
1347                         buffer_info->time_stamp = jiffies;
1348
1349                         len -= size;
1350                         offset += size;
1351                         count++;
1352                         if(++i == tx_ring->count) i = 0;
1353                 }
1354         }
1355         i = (i == 0) ? tx_ring->count - 1 : i - 1;
1356         tx_ring->buffer_info[i].skb = skb;
1357         tx_ring->buffer_info[first].next_to_watch = i;
1358
1359         return count;
1360 }
1361
1362 static inline void
1363 ixgb_tx_queue(struct ixgb_adapter *adapter, int count, int vlan_id,int tx_flags)
1364 {
1365         struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
1366         struct ixgb_tx_desc *tx_desc = NULL;
1367         struct ixgb_buffer *buffer_info;
1368         uint32_t cmd_type_len = adapter->tx_cmd_type;
1369         uint8_t status = 0;
1370         uint8_t popts = 0;
1371         unsigned int i;
1372
1373         if(tx_flags & IXGB_TX_FLAGS_TSO) {
1374                 cmd_type_len |= IXGB_TX_DESC_CMD_TSE;
1375                 popts |= (IXGB_TX_DESC_POPTS_IXSM | IXGB_TX_DESC_POPTS_TXSM);
1376         }
1377
1378         if(tx_flags & IXGB_TX_FLAGS_CSUM)
1379                 popts |= IXGB_TX_DESC_POPTS_TXSM;
1380
1381         if(tx_flags & IXGB_TX_FLAGS_VLAN) {
1382                 cmd_type_len |= IXGB_TX_DESC_CMD_VLE;
1383         }
1384
1385         i = tx_ring->next_to_use;
1386
1387         while(count--) {
1388                 buffer_info = &tx_ring->buffer_info[i];
1389                 tx_desc = IXGB_TX_DESC(*tx_ring, i);
1390                 tx_desc->buff_addr = cpu_to_le64(buffer_info->dma);
1391                 tx_desc->cmd_type_len =
1392                         cpu_to_le32(cmd_type_len | buffer_info->length);
1393                 tx_desc->status = status;
1394                 tx_desc->popts = popts;
1395                 tx_desc->vlan = cpu_to_le16(vlan_id);
1396
1397                 if(++i == tx_ring->count) i = 0;
1398         }
1399
1400         tx_desc->cmd_type_len |= cpu_to_le32(IXGB_TX_DESC_CMD_EOP
1401                                 | IXGB_TX_DESC_CMD_RS );
1402
1403         /* Force memory writes to complete before letting h/w
1404          * know there are new descriptors to fetch.  (Only
1405          * applicable for weak-ordered memory model archs,
1406          * such as IA-64). */
1407         wmb();
1408
1409         tx_ring->next_to_use = i;
1410         IXGB_WRITE_REG(&adapter->hw, TDT, i);
1411 }
1412
1413 /* Tx Descriptors needed, worst case */
1414 #define TXD_USE_COUNT(S) (((S) >> IXGB_MAX_TXD_PWR) + \
1415                          (((S) & (IXGB_MAX_DATA_PER_TXD - 1)) ? 1 : 0))
1416 #define DESC_NEEDED TXD_USE_COUNT(IXGB_MAX_DATA_PER_TXD) + \
1417         MAX_SKB_FRAGS * TXD_USE_COUNT(PAGE_SIZE) + 1 \
1418         /* one more for TSO workaround */ + 1
1419
1420 static int
1421 ixgb_xmit_frame(struct sk_buff *skb, struct net_device *netdev)
1422 {
1423         struct ixgb_adapter *adapter = netdev_priv(netdev);
1424         unsigned int first;
1425         unsigned int tx_flags = 0;
1426         unsigned long flags;
1427         int vlan_id = 0;
1428         int tso;
1429
1430         if(skb->len <= 0) {
1431                 dev_kfree_skb_any(skb);
1432                 return 0;
1433         }
1434
1435 #ifdef NETIF_F_LLTX
1436         local_irq_save(flags);
1437         if (!spin_trylock(&adapter->tx_lock)) {
1438                 /* Collision - tell upper layer to requeue */
1439                 local_irq_restore(flags);
1440                 return NETDEV_TX_LOCKED;
1441         }
1442 #else
1443         spin_lock_irqsave(&adapter->tx_lock, flags);
1444 #endif
1445
1446         if(unlikely(IXGB_DESC_UNUSED(&adapter->tx_ring) < DESC_NEEDED)) {
1447                 netif_stop_queue(netdev);
1448                 spin_unlock_irqrestore(&adapter->tx_lock, flags);
1449                 return NETDEV_TX_BUSY;
1450         }
1451
1452 #ifndef NETIF_F_LLTX
1453         spin_unlock_irqrestore(&adapter->tx_lock, flags);
1454 #endif
1455
1456         if(adapter->vlgrp && vlan_tx_tag_present(skb)) {
1457                 tx_flags |= IXGB_TX_FLAGS_VLAN;
1458                 vlan_id = vlan_tx_tag_get(skb);
1459         }
1460
1461         first = adapter->tx_ring.next_to_use;
1462
1463         tso = ixgb_tso(adapter, skb);
1464         if (tso < 0) {
1465                 dev_kfree_skb_any(skb);
1466 #ifdef NETIF_F_LLTX
1467                 spin_unlock_irqrestore(&adapter->tx_lock, flags);
1468 #endif
1469                 return NETDEV_TX_OK;
1470         }
1471
1472         if (likely(tso))
1473                 tx_flags |= IXGB_TX_FLAGS_TSO;
1474         else if(ixgb_tx_csum(adapter, skb))
1475                 tx_flags |= IXGB_TX_FLAGS_CSUM;
1476
1477         ixgb_tx_queue(adapter, ixgb_tx_map(adapter, skb, first), vlan_id,
1478                         tx_flags);
1479
1480         netdev->trans_start = jiffies;
1481
1482 #ifdef NETIF_F_LLTX
1483         /* Make sure there is space in the ring for the next send. */
1484         if(unlikely(IXGB_DESC_UNUSED(&adapter->tx_ring) < DESC_NEEDED))
1485                 netif_stop_queue(netdev);
1486
1487         spin_unlock_irqrestore(&adapter->tx_lock, flags);
1488
1489 #endif
1490         return NETDEV_TX_OK;
1491 }
1492
1493 /**
1494  * ixgb_tx_timeout - Respond to a Tx Hang
1495  * @netdev: network interface device structure
1496  **/
1497
1498 static void
1499 ixgb_tx_timeout(struct net_device *netdev)
1500 {
1501         struct ixgb_adapter *adapter = netdev_priv(netdev);
1502
1503         /* Do the reset outside of interrupt context */
1504         schedule_work(&adapter->tx_timeout_task);
1505 }
1506
1507 static void
1508 ixgb_tx_timeout_task(struct net_device *netdev)
1509 {
1510         struct ixgb_adapter *adapter = netdev_priv(netdev);
1511
1512         ixgb_down(adapter, TRUE);
1513         ixgb_up(adapter);
1514 }
1515
1516 /**
1517  * ixgb_get_stats - Get System Network Statistics
1518  * @netdev: network interface device structure
1519  *
1520  * Returns the address of the device statistics structure.
1521  * The statistics are actually updated from the timer callback.
1522  **/
1523
1524 static struct net_device_stats *
1525 ixgb_get_stats(struct net_device *netdev)
1526 {
1527         struct ixgb_adapter *adapter = netdev_priv(netdev);
1528
1529         return &adapter->net_stats;
1530 }
1531
1532 /**
1533  * ixgb_change_mtu - Change the Maximum Transfer Unit
1534  * @netdev: network interface device structure
1535  * @new_mtu: new value for maximum frame size
1536  *
1537  * Returns 0 on success, negative on failure
1538  **/
1539
1540 static int
1541 ixgb_change_mtu(struct net_device *netdev, int new_mtu)
1542 {
1543         struct ixgb_adapter *adapter = netdev_priv(netdev);
1544         int max_frame = new_mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;
1545         int old_max_frame = netdev->mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;
1546
1547
1548         if((max_frame < IXGB_MIN_ENET_FRAME_SIZE_WITHOUT_FCS + ENET_FCS_LENGTH)
1549            || (max_frame > IXGB_MAX_JUMBO_FRAME_SIZE + ENET_FCS_LENGTH)) {
1550                 DPRINTK(PROBE, ERR, "Invalid MTU setting %d\n", new_mtu);
1551                 return -EINVAL;
1552         }
1553
1554         if((max_frame <= IXGB_MAX_ENET_FRAME_SIZE_WITHOUT_FCS + ENET_FCS_LENGTH)
1555            || (max_frame <= IXGB_RXBUFFER_2048)) {
1556                 adapter->rx_buffer_len = IXGB_RXBUFFER_2048;
1557
1558         } else if(max_frame <= IXGB_RXBUFFER_4096) {
1559                 adapter->rx_buffer_len = IXGB_RXBUFFER_4096;
1560
1561         } else if(max_frame <= IXGB_RXBUFFER_8192) {
1562                 adapter->rx_buffer_len = IXGB_RXBUFFER_8192;
1563
1564         } else {
1565                 adapter->rx_buffer_len = IXGB_RXBUFFER_16384;
1566         }
1567
1568         netdev->mtu = new_mtu;
1569
1570         if(old_max_frame != max_frame && netif_running(netdev)) {
1571
1572                 ixgb_down(adapter, TRUE);
1573                 ixgb_up(adapter);
1574         }
1575
1576         return 0;
1577 }
1578
1579 /**
1580  * ixgb_update_stats - Update the board statistics counters.
1581  * @adapter: board private structure
1582  **/
1583
1584 void
1585 ixgb_update_stats(struct ixgb_adapter *adapter)
1586 {
1587         struct net_device *netdev = adapter->netdev;
1588
1589         if((netdev->flags & IFF_PROMISC) || (netdev->flags & IFF_ALLMULTI) ||
1590            (netdev->mc_count > IXGB_MAX_NUM_MULTICAST_ADDRESSES)) {
1591                 u64 multi = IXGB_READ_REG(&adapter->hw, MPRCL);
1592                 u32 bcast_l = IXGB_READ_REG(&adapter->hw, BPRCL);
1593                 u32 bcast_h = IXGB_READ_REG(&adapter->hw, BPRCH);
1594                 u64 bcast = ((u64)bcast_h << 32) | bcast_l;
1595
1596                 multi |= ((u64)IXGB_READ_REG(&adapter->hw, MPRCH) << 32);
1597                 /* fix up multicast stats by removing broadcasts */
1598                 if(multi >= bcast)
1599                         multi -= bcast;
1600
1601                 adapter->stats.mprcl += (multi & 0xFFFFFFFF);
1602                 adapter->stats.mprch += (multi >> 32);
1603                 adapter->stats.bprcl += bcast_l;
1604                 adapter->stats.bprch += bcast_h;
1605         } else {
1606                 adapter->stats.mprcl += IXGB_READ_REG(&adapter->hw, MPRCL);
1607                 adapter->stats.mprch += IXGB_READ_REG(&adapter->hw, MPRCH);
1608                 adapter->stats.bprcl += IXGB_READ_REG(&adapter->hw, BPRCL);
1609                 adapter->stats.bprch += IXGB_READ_REG(&adapter->hw, BPRCH);
1610         }
1611         adapter->stats.tprl += IXGB_READ_REG(&adapter->hw, TPRL);
1612         adapter->stats.tprh += IXGB_READ_REG(&adapter->hw, TPRH);
1613         adapter->stats.gprcl += IXGB_READ_REG(&adapter->hw, GPRCL);
1614         adapter->stats.gprch += IXGB_READ_REG(&adapter->hw, GPRCH);
1615         adapter->stats.uprcl += IXGB_READ_REG(&adapter->hw, UPRCL);
1616         adapter->stats.uprch += IXGB_READ_REG(&adapter->hw, UPRCH);
1617         adapter->stats.vprcl += IXGB_READ_REG(&adapter->hw, VPRCL);
1618         adapter->stats.vprch += IXGB_READ_REG(&adapter->hw, VPRCH);
1619         adapter->stats.jprcl += IXGB_READ_REG(&adapter->hw, JPRCL);
1620         adapter->stats.jprch += IXGB_READ_REG(&adapter->hw, JPRCH);
1621         adapter->stats.gorcl += IXGB_READ_REG(&adapter->hw, GORCL);
1622         adapter->stats.gorch += IXGB_READ_REG(&adapter->hw, GORCH);
1623         adapter->stats.torl += IXGB_READ_REG(&adapter->hw, TORL);
1624         adapter->stats.torh += IXGB_READ_REG(&adapter->hw, TORH);
1625         adapter->stats.rnbc += IXGB_READ_REG(&adapter->hw, RNBC);
1626         adapter->stats.ruc += IXGB_READ_REG(&adapter->hw, RUC);
1627         adapter->stats.roc += IXGB_READ_REG(&adapter->hw, ROC);
1628         adapter->stats.rlec += IXGB_READ_REG(&adapter->hw, RLEC);
1629         adapter->stats.crcerrs += IXGB_READ_REG(&adapter->hw, CRCERRS);
1630         adapter->stats.icbc += IXGB_READ_REG(&adapter->hw, ICBC);
1631         adapter->stats.ecbc += IXGB_READ_REG(&adapter->hw, ECBC);
1632         adapter->stats.mpc += IXGB_READ_REG(&adapter->hw, MPC);
1633         adapter->stats.tptl += IXGB_READ_REG(&adapter->hw, TPTL);
1634         adapter->stats.tpth += IXGB_READ_REG(&adapter->hw, TPTH);
1635         adapter->stats.gptcl += IXGB_READ_REG(&adapter->hw, GPTCL);
1636         adapter->stats.gptch += IXGB_READ_REG(&adapter->hw, GPTCH);
1637         adapter->stats.bptcl += IXGB_READ_REG(&adapter->hw, BPTCL);
1638         adapter->stats.bptch += IXGB_READ_REG(&adapter->hw, BPTCH);
1639         adapter->stats.mptcl += IXGB_READ_REG(&adapter->hw, MPTCL);
1640         adapter->stats.mptch += IXGB_READ_REG(&adapter->hw, MPTCH);
1641         adapter->stats.uptcl += IXGB_READ_REG(&adapter->hw, UPTCL);
1642         adapter->stats.uptch += IXGB_READ_REG(&adapter->hw, UPTCH);
1643         adapter->stats.vptcl += IXGB_READ_REG(&adapter->hw, VPTCL);
1644         adapter->stats.vptch += IXGB_READ_REG(&adapter->hw, VPTCH);
1645         adapter->stats.jptcl += IXGB_READ_REG(&adapter->hw, JPTCL);
1646         adapter->stats.jptch += IXGB_READ_REG(&adapter->hw, JPTCH);
1647         adapter->stats.gotcl += IXGB_READ_REG(&adapter->hw, GOTCL);
1648         adapter->stats.gotch += IXGB_READ_REG(&adapter->hw, GOTCH);
1649         adapter->stats.totl += IXGB_READ_REG(&adapter->hw, TOTL);
1650         adapter->stats.toth += IXGB_READ_REG(&adapter->hw, TOTH);
1651         adapter->stats.dc += IXGB_READ_REG(&adapter->hw, DC);
1652         adapter->stats.plt64c += IXGB_READ_REG(&adapter->hw, PLT64C);
1653         adapter->stats.tsctc += IXGB_READ_REG(&adapter->hw, TSCTC);
1654         adapter->stats.tsctfc += IXGB_READ_REG(&adapter->hw, TSCTFC);
1655         adapter->stats.ibic += IXGB_READ_REG(&adapter->hw, IBIC);
1656         adapter->stats.rfc += IXGB_READ_REG(&adapter->hw, RFC);
1657         adapter->stats.lfc += IXGB_READ_REG(&adapter->hw, LFC);
1658         adapter->stats.pfrc += IXGB_READ_REG(&adapter->hw, PFRC);
1659         adapter->stats.pftc += IXGB_READ_REG(&adapter->hw, PFTC);
1660         adapter->stats.mcfrc += IXGB_READ_REG(&adapter->hw, MCFRC);
1661         adapter->stats.mcftc += IXGB_READ_REG(&adapter->hw, MCFTC);
1662         adapter->stats.xonrxc += IXGB_READ_REG(&adapter->hw, XONRXC);
1663         adapter->stats.xontxc += IXGB_READ_REG(&adapter->hw, XONTXC);
1664         adapter->stats.xoffrxc += IXGB_READ_REG(&adapter->hw, XOFFRXC);
1665         adapter->stats.xofftxc += IXGB_READ_REG(&adapter->hw, XOFFTXC);
1666         adapter->stats.rjc += IXGB_READ_REG(&adapter->hw, RJC);
1667
1668         /* Fill out the OS statistics structure */
1669
1670         adapter->net_stats.rx_packets = adapter->stats.gprcl;
1671         adapter->net_stats.tx_packets = adapter->stats.gptcl;
1672         adapter->net_stats.rx_bytes = adapter->stats.gorcl;
1673         adapter->net_stats.tx_bytes = adapter->stats.gotcl;
1674         adapter->net_stats.multicast = adapter->stats.mprcl;
1675         adapter->net_stats.collisions = 0;
1676
1677         /* ignore RLEC as it reports errors for padded (<64bytes) frames
1678          * with a length in the type/len field */
1679         adapter->net_stats.rx_errors =
1680             /* adapter->stats.rnbc + */ adapter->stats.crcerrs +
1681             adapter->stats.ruc +
1682             adapter->stats.roc /*+ adapter->stats.rlec */  +
1683             adapter->stats.icbc +
1684             adapter->stats.ecbc + adapter->stats.mpc;
1685
1686         /* see above
1687          * adapter->net_stats.rx_length_errors = adapter->stats.rlec;
1688          */
1689
1690         adapter->net_stats.rx_crc_errors = adapter->stats.crcerrs;
1691         adapter->net_stats.rx_fifo_errors = adapter->stats.mpc;
1692         adapter->net_stats.rx_missed_errors = adapter->stats.mpc;
1693         adapter->net_stats.rx_over_errors = adapter->stats.mpc;
1694
1695         adapter->net_stats.tx_errors = 0;
1696         adapter->net_stats.rx_frame_errors = 0;
1697         adapter->net_stats.tx_aborted_errors = 0;
1698         adapter->net_stats.tx_carrier_errors = 0;
1699         adapter->net_stats.tx_fifo_errors = 0;
1700         adapter->net_stats.tx_heartbeat_errors = 0;
1701         adapter->net_stats.tx_window_errors = 0;
1702 }
1703
1704 #define IXGB_MAX_INTR 10
1705 /**
1706  * ixgb_intr - Interrupt Handler
1707  * @irq: interrupt number
1708  * @data: pointer to a network interface device structure
1709  * @pt_regs: CPU registers structure
1710  **/
1711
1712 static irqreturn_t
1713 ixgb_intr(int irq, void *data, struct pt_regs *regs)
1714 {
1715         struct net_device *netdev = data;
1716         struct ixgb_adapter *adapter = netdev_priv(netdev);
1717         struct ixgb_hw *hw = &adapter->hw;
1718         uint32_t icr = IXGB_READ_REG(hw, ICR);
1719 #ifndef CONFIG_IXGB_NAPI
1720         unsigned int i;
1721 #endif
1722
1723         if(unlikely(!icr))
1724                 return IRQ_NONE;  /* Not our interrupt */
1725
1726         if(unlikely(icr & (IXGB_INT_RXSEQ | IXGB_INT_LSC))) {
1727                 mod_timer(&adapter->watchdog_timer, jiffies);
1728         }
1729
1730 #ifdef CONFIG_IXGB_NAPI
1731         if(netif_rx_schedule_prep(netdev)) {
1732
1733                 /* Disable interrupts and register for poll. The flush
1734                   of the posted write is intentionally left out.
1735                 */
1736
1737                 atomic_inc(&adapter->irq_sem);
1738                 IXGB_WRITE_REG(&adapter->hw, IMC, ~0);
1739                 __netif_rx_schedule(netdev);
1740         }
1741 #else
1742         /* yes, that is actually a & and it is meant to make sure that
1743          * every pass through this for loop checks both receive and
1744          * transmit queues for completed descriptors, intended to
1745          * avoid starvation issues and assist tx/rx fairness. */
1746         for(i = 0; i < IXGB_MAX_INTR; i++)
1747                 if(!ixgb_clean_rx_irq(adapter) &
1748                    !ixgb_clean_tx_irq(adapter))
1749                         break;
1750 #endif
1751         return IRQ_HANDLED;
1752 }
1753
1754 #ifdef CONFIG_IXGB_NAPI
1755 /**
1756  * ixgb_clean - NAPI Rx polling callback
1757  * @adapter: board private structure
1758  **/
1759
1760 static int
1761 ixgb_clean(struct net_device *netdev, int *budget)
1762 {
1763         struct ixgb_adapter *adapter = netdev_priv(netdev);
1764         int work_to_do = min(*budget, netdev->quota);
1765         int tx_cleaned;
1766         int work_done = 0;
1767
1768         tx_cleaned = ixgb_clean_tx_irq(adapter);
1769         ixgb_clean_rx_irq(adapter, &work_done, work_to_do);
1770
1771         *budget -= work_done;
1772         netdev->quota -= work_done;
1773
1774         /* if no Tx and not enough Rx work done, exit the polling mode */
1775         if((!tx_cleaned && (work_done == 0)) || !netif_running(netdev)) {
1776                 netif_rx_complete(netdev);
1777                 ixgb_irq_enable(adapter);
1778                 return 0;
1779         }
1780
1781         return 1;
1782 }
1783 #endif
1784
1785 /**
1786  * ixgb_clean_tx_irq - Reclaim resources after transmit completes
1787  * @adapter: board private structure
1788  **/
1789
1790 static boolean_t
1791 ixgb_clean_tx_irq(struct ixgb_adapter *adapter)
1792 {
1793         struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
1794         struct net_device *netdev = adapter->netdev;
1795         struct ixgb_tx_desc *tx_desc, *eop_desc;
1796         struct ixgb_buffer *buffer_info;
1797         unsigned int i, eop;
1798         boolean_t cleaned = FALSE;
1799
1800         i = tx_ring->next_to_clean;
1801         eop = tx_ring->buffer_info[i].next_to_watch;
1802         eop_desc = IXGB_TX_DESC(*tx_ring, eop);
1803
1804         while(eop_desc->status & IXGB_TX_DESC_STATUS_DD) {
1805
1806                 for(cleaned = FALSE; !cleaned; ) {
1807                         tx_desc = IXGB_TX_DESC(*tx_ring, i);
1808                         buffer_info = &tx_ring->buffer_info[i];
1809
1810                         if (tx_desc->popts
1811                             & (IXGB_TX_DESC_POPTS_TXSM |
1812                                IXGB_TX_DESC_POPTS_IXSM))
1813                                 adapter->hw_csum_tx_good++;
1814
1815                         ixgb_unmap_and_free_tx_resource(adapter, buffer_info);
1816
1817                         *(uint32_t *)&(tx_desc->status) = 0;
1818
1819                         cleaned = (i == eop);
1820                         if(++i == tx_ring->count) i = 0;
1821                 }
1822
1823                 eop = tx_ring->buffer_info[i].next_to_watch;
1824                 eop_desc = IXGB_TX_DESC(*tx_ring, eop);
1825         }
1826
1827         tx_ring->next_to_clean = i;
1828
1829         spin_lock(&adapter->tx_lock);
1830         if(cleaned && netif_queue_stopped(netdev) && netif_carrier_ok(netdev) &&
1831            (IXGB_DESC_UNUSED(tx_ring) > IXGB_TX_QUEUE_WAKE)) {
1832
1833                 netif_wake_queue(netdev);
1834         }
1835         spin_unlock(&adapter->tx_lock);
1836
1837         if(adapter->detect_tx_hung) {
1838                 /* detect a transmit hang in hardware, this serializes the
1839                  * check with the clearing of time_stamp and movement of i */
1840                 adapter->detect_tx_hung = FALSE;
1841                 if(tx_ring->buffer_info[i].dma &&
1842                    time_after(jiffies, tx_ring->buffer_info[i].time_stamp + HZ)
1843                    && !(IXGB_READ_REG(&adapter->hw, STATUS) &
1844                         IXGB_STATUS_TXOFF))
1845                         netif_stop_queue(netdev);
1846         }
1847
1848         return cleaned;
1849 }
1850
1851 /**
1852  * ixgb_rx_checksum - Receive Checksum Offload for 82597.
1853  * @adapter: board private structure
1854  * @rx_desc: receive descriptor
1855  * @sk_buff: socket buffer with received data
1856  **/
1857
1858 static inline void
1859 ixgb_rx_checksum(struct ixgb_adapter *adapter,
1860                  struct ixgb_rx_desc *rx_desc,
1861                  struct sk_buff *skb)
1862 {
1863         /* Ignore Checksum bit is set OR
1864          * TCP Checksum has not been calculated
1865          */
1866         if((rx_desc->status & IXGB_RX_DESC_STATUS_IXSM) ||
1867            (!(rx_desc->status & IXGB_RX_DESC_STATUS_TCPCS))) {
1868                 skb->ip_summed = CHECKSUM_NONE;
1869                 return;
1870         }
1871
1872         /* At this point we know the hardware did the TCP checksum */
1873         /* now look at the TCP checksum error bit */
1874         if(rx_desc->errors & IXGB_RX_DESC_ERRORS_TCPE) {
1875                 /* let the stack verify checksum errors */
1876                 skb->ip_summed = CHECKSUM_NONE;
1877                 adapter->hw_csum_rx_error++;
1878         } else {
1879                 /* TCP checksum is good */
1880                 skb->ip_summed = CHECKSUM_UNNECESSARY;
1881                 adapter->hw_csum_rx_good++;
1882         }
1883 }
1884
1885 /**
1886  * ixgb_clean_rx_irq - Send received data up the network stack,
1887  * @adapter: board private structure
1888  **/
1889
1890 static boolean_t
1891 #ifdef CONFIG_IXGB_NAPI
1892 ixgb_clean_rx_irq(struct ixgb_adapter *adapter, int *work_done, int work_to_do)
1893 #else
1894 ixgb_clean_rx_irq(struct ixgb_adapter *adapter)
1895 #endif
1896 {
1897         struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
1898         struct net_device *netdev = adapter->netdev;
1899         struct pci_dev *pdev = adapter->pdev;
1900         struct ixgb_rx_desc *rx_desc, *next_rxd;
1901         struct ixgb_buffer *buffer_info, *next_buffer, *next2_buffer;
1902         uint32_t length;
1903         unsigned int i, j;
1904         boolean_t cleaned = FALSE;
1905
1906         i = rx_ring->next_to_clean;
1907         rx_desc = IXGB_RX_DESC(*rx_ring, i);
1908         buffer_info = &rx_ring->buffer_info[i];
1909
1910         while(rx_desc->status & IXGB_RX_DESC_STATUS_DD) {
1911                 struct sk_buff *skb, *next_skb;
1912                 u8 status;
1913
1914 #ifdef CONFIG_IXGB_NAPI
1915                 if(*work_done >= work_to_do)
1916                         break;
1917
1918                 (*work_done)++;
1919 #endif
1920                 status = rx_desc->status;
1921                 skb = buffer_info->skb;
1922
1923                 prefetch(skb->data);
1924
1925                 if(++i == rx_ring->count) i = 0;
1926                 next_rxd = IXGB_RX_DESC(*rx_ring, i);
1927                 prefetch(next_rxd);
1928
1929                 if((j = i + 1) == rx_ring->count) j = 0;
1930                 next2_buffer = &rx_ring->buffer_info[j];
1931                 prefetch(next2_buffer);
1932
1933                 next_buffer = &rx_ring->buffer_info[i];
1934                 next_skb = next_buffer->skb;
1935                 prefetch(next_skb);
1936
1937                 cleaned = TRUE;
1938
1939                 pci_unmap_single(pdev,
1940                                  buffer_info->dma,
1941                                  buffer_info->length,
1942                                  PCI_DMA_FROMDEVICE);
1943
1944                 length = le16_to_cpu(rx_desc->length);
1945
1946                 if(unlikely(!(status & IXGB_RX_DESC_STATUS_EOP))) {
1947
1948                         /* All receives must fit into a single buffer */
1949
1950                         IXGB_DBG("Receive packet consumed multiple buffers "
1951                                          "length<%x>\n", length);
1952
1953                         dev_kfree_skb_irq(skb);
1954                         goto rxdesc_done;
1955                 }
1956
1957                 if (unlikely(rx_desc->errors
1958                              & (IXGB_RX_DESC_ERRORS_CE | IXGB_RX_DESC_ERRORS_SE
1959                                 | IXGB_RX_DESC_ERRORS_P |
1960                                 IXGB_RX_DESC_ERRORS_RXE))) {
1961
1962                         dev_kfree_skb_irq(skb);
1963                         goto rxdesc_done;
1964                 }
1965
1966                 /* Good Receive */
1967                 skb_put(skb, length);
1968
1969                 /* Receive Checksum Offload */
1970                 ixgb_rx_checksum(adapter, rx_desc, skb);
1971
1972                 skb->protocol = eth_type_trans(skb, netdev);
1973 #ifdef CONFIG_IXGB_NAPI
1974                 if(adapter->vlgrp && (status & IXGB_RX_DESC_STATUS_VP)) {
1975                         vlan_hwaccel_receive_skb(skb, adapter->vlgrp,
1976                                 le16_to_cpu(rx_desc->special) &
1977                                         IXGB_RX_DESC_SPECIAL_VLAN_MASK);
1978                 } else {
1979                         netif_receive_skb(skb);
1980                 }
1981 #else /* CONFIG_IXGB_NAPI */
1982                 if(adapter->vlgrp && (status & IXGB_RX_DESC_STATUS_VP)) {
1983                         vlan_hwaccel_rx(skb, adapter->vlgrp,
1984                                 le16_to_cpu(rx_desc->special) &
1985                                         IXGB_RX_DESC_SPECIAL_VLAN_MASK);
1986                 } else {
1987                         netif_rx(skb);
1988                 }
1989 #endif /* CONFIG_IXGB_NAPI */
1990                 netdev->last_rx = jiffies;
1991
1992 rxdesc_done:
1993                 /* clean up descriptor, might be written over by hw */
1994                 rx_desc->status = 0;
1995                 buffer_info->skb = NULL;
1996
1997                 /* use prefetched values */
1998                 rx_desc = next_rxd;
1999                 buffer_info = next_buffer;
2000         }
2001
2002         rx_ring->next_to_clean = i;
2003
2004         ixgb_alloc_rx_buffers(adapter);
2005
2006         return cleaned;
2007 }
2008
2009 /**
2010  * ixgb_alloc_rx_buffers - Replace used receive buffers
2011  * @adapter: address of board private structure
2012  **/
2013
2014 static void
2015 ixgb_alloc_rx_buffers(struct ixgb_adapter *adapter)
2016 {
2017         struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
2018         struct net_device *netdev = adapter->netdev;
2019         struct pci_dev *pdev = adapter->pdev;
2020         struct ixgb_rx_desc *rx_desc;
2021         struct ixgb_buffer *buffer_info;
2022         struct sk_buff *skb;
2023         unsigned int i;
2024         int num_group_tail_writes;
2025         long cleancount;
2026
2027         i = rx_ring->next_to_use;
2028         buffer_info = &rx_ring->buffer_info[i];
2029         cleancount = IXGB_DESC_UNUSED(rx_ring);
2030
2031         num_group_tail_writes = IXGB_RX_BUFFER_WRITE;
2032
2033         /* leave three descriptors unused */
2034         while(--cleancount > 2) {
2035                 rx_desc = IXGB_RX_DESC(*rx_ring, i);
2036
2037                 skb = dev_alloc_skb(adapter->rx_buffer_len + NET_IP_ALIGN);
2038
2039                 if(unlikely(!skb)) {
2040                         /* Better luck next round */
2041                         break;
2042                 }
2043
2044                 /* Make buffer alignment 2 beyond a 16 byte boundary
2045                  * this will result in a 16 byte aligned IP header after
2046                  * the 14 byte MAC header is removed
2047                  */
2048                 skb_reserve(skb, NET_IP_ALIGN);
2049
2050                 skb->dev = netdev;
2051
2052                 buffer_info->skb = skb;
2053                 buffer_info->length = adapter->rx_buffer_len;
2054                 buffer_info->dma =
2055                         pci_map_single(pdev,
2056                                    skb->data,
2057                                    adapter->rx_buffer_len,
2058                                    PCI_DMA_FROMDEVICE);
2059
2060                 rx_desc->buff_addr = cpu_to_le64(buffer_info->dma);
2061                 /* guarantee DD bit not set now before h/w gets descriptor
2062                  * this is the rest of the workaround for h/w double
2063                  * writeback. */
2064                 rx_desc->status = 0;
2065
2066                 if((i & ~(num_group_tail_writes- 1)) == i) {
2067                         /* Force memory writes to complete before letting h/w
2068                          * know there are new descriptors to fetch.  (Only
2069                          * applicable for weak-ordered memory model archs,
2070                          * such as IA-64). */
2071                         wmb();
2072
2073                         IXGB_WRITE_REG(&adapter->hw, RDT, i);
2074                 }
2075
2076                 if(++i == rx_ring->count) i = 0;
2077                 buffer_info = &rx_ring->buffer_info[i];
2078         }
2079
2080         rx_ring->next_to_use = i;
2081 }
2082
2083 /**
2084  * ixgb_vlan_rx_register - enables or disables vlan tagging/stripping.
2085  *
2086  * @param netdev network interface device structure
2087  * @param grp indicates to enable or disable tagging/stripping
2088  **/
2089 static void
2090 ixgb_vlan_rx_register(struct net_device *netdev, struct vlan_group *grp)
2091 {
2092         struct ixgb_adapter *adapter = netdev_priv(netdev);
2093         uint32_t ctrl, rctl;
2094
2095         ixgb_irq_disable(adapter);
2096         adapter->vlgrp = grp;
2097
2098         if(grp) {
2099                 /* enable VLAN tag insert/strip */
2100                 ctrl = IXGB_READ_REG(&adapter->hw, CTRL0);
2101                 ctrl |= IXGB_CTRL0_VME;
2102                 IXGB_WRITE_REG(&adapter->hw, CTRL0, ctrl);
2103
2104                 /* enable VLAN receive filtering */
2105
2106                 rctl = IXGB_READ_REG(&adapter->hw, RCTL);
2107                 rctl |= IXGB_RCTL_VFE;
2108                 rctl &= ~IXGB_RCTL_CFIEN;
2109                 IXGB_WRITE_REG(&adapter->hw, RCTL, rctl);
2110         } else {
2111                 /* disable VLAN tag insert/strip */
2112
2113                 ctrl = IXGB_READ_REG(&adapter->hw, CTRL0);
2114                 ctrl &= ~IXGB_CTRL0_VME;
2115                 IXGB_WRITE_REG(&adapter->hw, CTRL0, ctrl);
2116
2117                 /* disable VLAN filtering */
2118
2119                 rctl = IXGB_READ_REG(&adapter->hw, RCTL);
2120                 rctl &= ~IXGB_RCTL_VFE;
2121                 IXGB_WRITE_REG(&adapter->hw, RCTL, rctl);
2122         }
2123
2124         ixgb_irq_enable(adapter);
2125 }
2126
2127 static void
2128 ixgb_vlan_rx_add_vid(struct net_device *netdev, uint16_t vid)
2129 {
2130         struct ixgb_adapter *adapter = netdev_priv(netdev);
2131         uint32_t vfta, index;
2132
2133         /* add VID to filter table */
2134
2135         index = (vid >> 5) & 0x7F;
2136         vfta = IXGB_READ_REG_ARRAY(&adapter->hw, VFTA, index);
2137         vfta |= (1 << (vid & 0x1F));
2138         ixgb_write_vfta(&adapter->hw, index, vfta);
2139 }
2140
2141 static void
2142 ixgb_vlan_rx_kill_vid(struct net_device *netdev, uint16_t vid)
2143 {
2144         struct ixgb_adapter *adapter = netdev_priv(netdev);
2145         uint32_t vfta, index;
2146
2147         ixgb_irq_disable(adapter);
2148
2149         if(adapter->vlgrp)
2150                 adapter->vlgrp->vlan_devices[vid] = NULL;
2151
2152         ixgb_irq_enable(adapter);
2153
2154         /* remove VID from filter table*/
2155
2156         index = (vid >> 5) & 0x7F;
2157         vfta = IXGB_READ_REG_ARRAY(&adapter->hw, VFTA, index);
2158         vfta &= ~(1 << (vid & 0x1F));
2159         ixgb_write_vfta(&adapter->hw, index, vfta);
2160 }
2161
2162 static void
2163 ixgb_restore_vlan(struct ixgb_adapter *adapter)
2164 {
2165         ixgb_vlan_rx_register(adapter->netdev, adapter->vlgrp);
2166
2167         if(adapter->vlgrp) {
2168                 uint16_t vid;
2169                 for(vid = 0; vid < VLAN_GROUP_ARRAY_LEN; vid++) {
2170                         if(!adapter->vlgrp->vlan_devices[vid])
2171                                 continue;
2172                         ixgb_vlan_rx_add_vid(adapter->netdev, vid);
2173                 }
2174         }
2175 }
2176
2177 #ifdef CONFIG_NET_POLL_CONTROLLER
2178 /*
2179  * Polling 'interrupt' - used by things like netconsole to send skbs
2180  * without having to re-enable interrupts. It's not called while
2181  * the interrupt routine is executing.
2182  */
2183
2184 static void ixgb_netpoll(struct net_device *dev)
2185 {
2186         struct ixgb_adapter *adapter = dev->priv;
2187
2188         disable_irq(adapter->pdev->irq);
2189         ixgb_intr(adapter->pdev->irq, dev, NULL);
2190         enable_irq(adapter->pdev->irq);
2191 }
2192 #endif
2193
2194 /* ixgb_main.c */