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

   1 /*******************************************************************************
   2
   3   Intel PRO/10GbE Linux driver
   4   Copyright(c) 1999 - 2006 Intel Corporation.
   5
   6   This program is free software; you can redistribute it and/or modify it
   7   under the terms and conditions of the GNU General Public License,
   8   version 2, as published by the Free Software Foundation.
   9
  10   This program is distributed in the hope it will be useful, but WITHOUT
  11   ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  12   FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  13   more details.
  14
  15   You should have received a copy of the GNU General Public License along with
  16   this program; if not, write to the Free Software Foundation, Inc.,
  17   51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
  18
  19   The full GNU General Public License is included in this distribution in
  20   the file called "COPYING".
  21
  22   Contact Information:
  23   Linux NICS <linux.nics@intel.com>
  24   e1000-devel Mailing List <e1000-devel@lists.sourceforge.net>
  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             "1.0.117-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);
  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 static pci_ers_result_t ixgb_io_error_detected (struct pci_dev *pdev,
 122                              enum pci_channel_state state);
 123 static pci_ers_result_t ixgb_io_slot_reset (struct pci_dev *pdev);
 124 static void ixgb_io_resume (struct pci_dev *pdev);
 125
 126 /* Exported from other modules */
 127 extern void ixgb_check_options(struct ixgb_adapter *adapter);
 128
 129 static struct pci_error_handlers ixgb_err_handler = {
 130         .error_detected = ixgb_io_error_detected,
 131         .slot_reset = ixgb_io_slot_reset,
 132         .resume = ixgb_io_resume,
 133 };
 134
 135 static struct pci_driver ixgb_driver = {
 136         .name     = ixgb_driver_name,
 137         .id_table = ixgb_pci_tbl,
 138         .probe    = ixgb_probe,
 139         .remove   = __devexit_p(ixgb_remove),
 140         .err_handler = &ixgb_err_handler
 141 };
 142
 143 MODULE_AUTHOR("Intel Corporation, <linux.nics@intel.com>");
 144 MODULE_DESCRIPTION("Intel(R) PRO/10GbE Network Driver");
 145 MODULE_LICENSE("GPL");
 146 MODULE_VERSION(DRV_VERSION);
 147
 148 #define DEFAULT_DEBUG_LEVEL_SHIFT 3
 149 static int debug = DEFAULT_DEBUG_LEVEL_SHIFT;
 150 module_param(debug, int, 0);
 151 MODULE_PARM_DESC(debug, "Debug level (0=none,...,16=all)");
 152
 153 /* some defines for controlling descriptor fetches in h/w */
 154 #define RXDCTL_WTHRESH_DEFAULT 15  /* chip writes back at this many or RXT0 */
 155 #define RXDCTL_PTHRESH_DEFAULT 0   /* chip considers prefech below
 156                                     * this */
 157 #define RXDCTL_HTHRESH_DEFAULT 0   /* chip will only prefetch if tail
 158                                     * is pushed this many descriptors
 159                                     * from head */
 160
 161 /**
 162  * ixgb_init_module - Driver Registration Routine
 163  *
 164  * ixgb_init_module is the first routine called when the driver is
 165  * loaded. All it does is register with the PCI subsystem.
 166  **/
 167
 168 static int __init
 169 ixgb_init_module(void)
 170 {
 171         printk(KERN_INFO "%s - version %s\n",
 172                ixgb_driver_string, ixgb_driver_version);
 173
 174         printk(KERN_INFO "%s\n", ixgb_copyright);
 175
 176         return pci_register_driver(&ixgb_driver);
 177 }
 178
 179 module_init(ixgb_init_module);
 180
 181 /**
 182  * ixgb_exit_module - Driver Exit Cleanup Routine
 183  *
 184  * ixgb_exit_module is called just before the driver is removed
 185  * from memory.
 186  **/
 187
 188 static void __exit
 189 ixgb_exit_module(void)
 190 {
 191         pci_unregister_driver(&ixgb_driver);
 192 }
 193
 194 module_exit(ixgb_exit_module);
 195
 196 /**
 197  * ixgb_irq_disable - Mask off interrupt generation on the NIC
 198  * @adapter: board private structure
 199  **/
 200
 201 static void
 202 ixgb_irq_disable(struct ixgb_adapter *adapter)
 203 {
 204         atomic_inc(&adapter->irq_sem);
 205         IXGB_WRITE_REG(&adapter->hw, IMC, ~0);
 206         IXGB_WRITE_FLUSH(&adapter->hw);
 207         synchronize_irq(adapter->pdev->irq);
 208 }
 209
 210 /**
 211  * ixgb_irq_enable - Enable default interrupt generation settings
 212  * @adapter: board private structure
 213  **/
 214
 215 static void
 216 ixgb_irq_enable(struct ixgb_adapter *adapter)
 217 {
 218         if(atomic_dec_and_test(&adapter->irq_sem)) {
 219                 IXGB_WRITE_REG(&adapter->hw, IMS,
 220                                IXGB_INT_RXT0 | IXGB_INT_RXDMT0 | IXGB_INT_TXDW |
 221                                IXGB_INT_LSC);
 222                 IXGB_WRITE_FLUSH(&adapter->hw);
 223         }
 224 }
 225
 226 int
 227 ixgb_up(struct ixgb_adapter *adapter)
 228 {
 229         struct net_device *netdev = adapter->netdev;
 230         int err;
 231         int max_frame = netdev->mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;
 232         struct ixgb_hw *hw = &adapter->hw;
 233
 234         /* hardware has been reset, we need to reload some things */
 235
 236         ixgb_rar_set(hw, netdev->dev_addr, 0);
 237         ixgb_set_multi(netdev);
 238
 239         ixgb_restore_vlan(adapter);
 240
 241         ixgb_configure_tx(adapter);
 242         ixgb_setup_rctl(adapter);
 243         ixgb_configure_rx(adapter);
 244         ixgb_alloc_rx_buffers(adapter);
 245
 246         /* disable interrupts and get the hardware into a known state */
 247         IXGB_WRITE_REG(&adapter->hw, IMC, 0xffffffff);
 248
 249 #ifdef CONFIG_PCI_MSI
 250         {
 251         boolean_t pcix = (IXGB_READ_REG(&adapter->hw, STATUS) &
 252                                                   IXGB_STATUS_PCIX_MODE) ? TRUE : FALSE;
 253         adapter->have_msi = TRUE;
 254
 255         if (!pcix)
 256            adapter->have_msi = FALSE;
 257         else if((err = pci_enable_msi(adapter->pdev))) {
 258                 DPRINTK(PROBE, ERR,
 259                  "Unable to allocate MSI interrupt Error: %d\n", err);
 260                 adapter->have_msi = FALSE;
 261                 /* proceed to try to request regular interrupt */
 262         }
 263         }
 264
 265 #endif
 266         if((err = request_irq(adapter->pdev->irq, &ixgb_intr,
 267                                   IRQF_SHARED | IRQF_SAMPLE_RANDOM,
 268                                   netdev->name, netdev))) {
 269                 DPRINTK(PROBE, ERR,
 270                  "Unable to allocate interrupt Error: %d\n", err);
 271                 return err;
 272         }
 273
 274         if((hw->max_frame_size != max_frame) ||
 275                 (hw->max_frame_size !=
 276                 (IXGB_READ_REG(hw, MFS) >> IXGB_MFS_SHIFT))) {
 277
 278                 hw->max_frame_size = max_frame;
 279
 280                 IXGB_WRITE_REG(hw, MFS, hw->max_frame_size << IXGB_MFS_SHIFT);
 281
 282                 if(hw->max_frame_size >
 283                    IXGB_MAX_ENET_FRAME_SIZE_WITHOUT_FCS + ENET_FCS_LENGTH) {
 284                         uint32_t ctrl0 = IXGB_READ_REG(hw, CTRL0);
 285
 286                         if(!(ctrl0 & IXGB_CTRL0_JFE)) {
 287                                 ctrl0 |= IXGB_CTRL0_JFE;
 288                                 IXGB_WRITE_REG(hw, CTRL0, ctrl0);
 289                         }
 290                 }
 291         }
 292
 293         mod_timer(&adapter->watchdog_timer, jiffies);
 294
 295 #ifdef CONFIG_IXGB_NAPI
 296         netif_poll_enable(netdev);
 297 #endif
 298         ixgb_irq_enable(adapter);
 299
 300         return 0;
 301 }
 302
 303 void
 304 ixgb_down(struct ixgb_adapter *adapter, boolean_t kill_watchdog)
 305 {
 306         struct net_device *netdev = adapter->netdev;
 307
 308         ixgb_irq_disable(adapter);
 309         free_irq(adapter->pdev->irq, netdev);
 310 #ifdef CONFIG_PCI_MSI
 311         if(adapter->have_msi == TRUE)
 312                 pci_disable_msi(adapter->pdev);
 313
 314 #endif
 315         if(kill_watchdog)
 316                 del_timer_sync(&adapter->watchdog_timer);
 317 #ifdef CONFIG_IXGB_NAPI
 318         netif_poll_disable(netdev);
 319 #endif
 320         adapter->link_speed = 0;
 321         adapter->link_duplex = 0;
 322         netif_carrier_off(netdev);
 323         netif_stop_queue(netdev);
 324
 325         ixgb_reset(adapter);
 326         ixgb_clean_tx_ring(adapter);
 327         ixgb_clean_rx_ring(adapter);
 328 }
 329
 330 void
 331 ixgb_reset(struct ixgb_adapter *adapter)
 332 {
 333
 334         ixgb_adapter_stop(&adapter->hw);
 335         if(!ixgb_init_hw(&adapter->hw))
 336                 DPRINTK(PROBE, ERR, "ixgb_init_hw failed.\n");
 337 }
 338
 339 /**
 340  * ixgb_probe - Device Initialization Routine
 341  * @pdev: PCI device information struct
 342  * @ent: entry in ixgb_pci_tbl
 343  *
 344  * Returns 0 on success, negative on failure
 345  *
 346  * ixgb_probe initializes an adapter identified by a pci_dev structure.
 347  * The OS initialization, configuring of the adapter private structure,
 348  * and a hardware reset occur.
 349  **/
 350
 351 static int __devinit
 352 ixgb_probe(struct pci_dev *pdev,
 353                 const struct pci_device_id *ent)
 354 {
 355         struct net_device *netdev = NULL;
 356         struct ixgb_adapter *adapter;
 357         static int cards_found = 0;
 358         unsigned long mmio_start;
 359         int mmio_len;
 360         int pci_using_dac;
 361         int i;
 362         int err;
 363
 364         if((err = pci_enable_device(pdev)))
 365                 return err;
 366
 367         if(!(err = pci_set_dma_mask(pdev, DMA_64BIT_MASK)) &&
 368            !(err = pci_set_consistent_dma_mask(pdev, DMA_64BIT_MASK))) {
 369                 pci_using_dac = 1;
 370         } else {
 371                 if((err = pci_set_dma_mask(pdev, DMA_32BIT_MASK)) ||
 372                    (err = pci_set_consistent_dma_mask(pdev, DMA_32BIT_MASK))) {
 373                         printk(KERN_ERR
 374                          "ixgb: No usable DMA configuration, aborting\n");
 375                         goto err_dma_mask;
 376                 }
 377                 pci_using_dac = 0;
 378         }
 379
 380         if((err = pci_request_regions(pdev, ixgb_driver_name)))
 381                 goto err_request_regions;
 382
 383         pci_set_master(pdev);
 384
 385         netdev = alloc_etherdev(sizeof(struct ixgb_adapter));
 386         if(!netdev) {
 387                 err = -ENOMEM;
 388                 goto err_alloc_etherdev;
 389         }
 390
 391         SET_MODULE_OWNER(netdev);
 392         SET_NETDEV_DEV(netdev, &pdev->dev);
 393
 394         pci_set_drvdata(pdev, netdev);
 395         adapter = netdev_priv(netdev);
 396         adapter->netdev = netdev;
 397         adapter->pdev = pdev;
 398         adapter->hw.back = adapter;
 399         adapter->msg_enable = netif_msg_init(debug, DEFAULT_DEBUG_LEVEL_SHIFT);
 400
 401         mmio_start = pci_resource_start(pdev, BAR_0);
 402         mmio_len = pci_resource_len(pdev, BAR_0);
 403
 404         adapter->hw.hw_addr = ioremap(mmio_start, mmio_len);
 405         if(!adapter->hw.hw_addr) {
 406                 err = -EIO;
 407                 goto err_ioremap;
 408         }
 409
 410         for(i = BAR_1; i <= BAR_5; i++) {
 411                 if(pci_resource_len(pdev, i) == 0)
 412                         continue;
 413                 if(pci_resource_flags(pdev, i) & IORESOURCE_IO) {
 414                         adapter->hw.io_base = pci_resource_start(pdev, i);
 415                         break;
 416                 }
 417         }
 418
 419         netdev->open = &ixgb_open;
 420         netdev->stop = &ixgb_close;
 421         netdev->hard_start_xmit = &ixgb_xmit_frame;
 422         netdev->get_stats = &ixgb_get_stats;
 423         netdev->set_multicast_list = &ixgb_set_multi;
 424         netdev->set_mac_address = &ixgb_set_mac;
 425         netdev->change_mtu = &ixgb_change_mtu;
 426         ixgb_set_ethtool_ops(netdev);
 427         netdev->tx_timeout = &ixgb_tx_timeout;
 428         netdev->watchdog_timeo = 5 * HZ;
 429 #ifdef CONFIG_IXGB_NAPI
 430         netdev->poll = &ixgb_clean;
 431         netdev->weight = 64;
 432 #endif
 433         netdev->vlan_rx_register = ixgb_vlan_rx_register;
 434         netdev->vlan_rx_add_vid = ixgb_vlan_rx_add_vid;
 435         netdev->vlan_rx_kill_vid = ixgb_vlan_rx_kill_vid;
 436 #ifdef CONFIG_NET_POLL_CONTROLLER
 437         netdev->poll_controller = ixgb_netpoll;
 438 #endif
 439
 440         strncpy(netdev->name, pci_name(pdev), sizeof(netdev->name) - 1);
 441         netdev->mem_start = mmio_start;
 442         netdev->mem_end = mmio_start + mmio_len;
 443         netdev->base_addr = adapter->hw.io_base;
 444
 445         adapter->bd_number = cards_found;
 446         adapter->link_speed = 0;
 447         adapter->link_duplex = 0;
 448
 449         /* setup the private structure */
 450
 451         if((err = ixgb_sw_init(adapter)))
 452                 goto err_sw_init;
 453
 454         netdev->features = NETIF_F_SG |
 455                            NETIF_F_HW_CSUM |
 456                            NETIF_F_HW_VLAN_TX |
 457                            NETIF_F_HW_VLAN_RX |
 458                            NETIF_F_HW_VLAN_FILTER;
 459 #ifdef NETIF_F_TSO
 460         netdev->features |= NETIF_F_TSO;
 461 #endif
 462 #ifdef NETIF_F_LLTX
 463         netdev->features |= NETIF_F_LLTX;
 464 #endif
 465
 466         if(pci_using_dac)
 467                 netdev->features |= NETIF_F_HIGHDMA;
 468
 469         /* make sure the EEPROM is good */
 470
 471         if(!ixgb_validate_eeprom_checksum(&adapter->hw)) {
 472                 DPRINTK(PROBE, ERR, "The EEPROM Checksum Is Not Valid\n");
 473                 err = -EIO;
 474                 goto err_eeprom;
 475         }
 476
 477         ixgb_get_ee_mac_addr(&adapter->hw, netdev->dev_addr);
 478         memcpy(netdev->perm_addr, netdev->dev_addr, netdev->addr_len);
 479
 480         if(!is_valid_ether_addr(netdev->perm_addr)) {
 481                 DPRINTK(PROBE, ERR, "Invalid MAC Address\n");
 482                 err = -EIO;
 483                 goto err_eeprom;
 484         }
 485
 486         adapter->part_num = ixgb_get_ee_pba_number(&adapter->hw);
 487
 488         init_timer(&adapter->watchdog_timer);
 489         adapter->watchdog_timer.function = &ixgb_watchdog;
 490         adapter->watchdog_timer.data = (unsigned long)adapter;
 491
 492         INIT_WORK(&adapter->tx_timeout_task,
 493                   (void (*)(void *))ixgb_tx_timeout_task, netdev);
 494
 495         strcpy(netdev->name, "eth%d");
 496         if((err = register_netdev(netdev)))
 497                 goto err_register;
 498
 499         /* we're going to reset, so assume we have no link for now */
 500
 501         netif_carrier_off(netdev);
 502         netif_stop_queue(netdev);
 503
 504         DPRINTK(PROBE, INFO, "Intel(R) PRO/10GbE Network Connection\n");
 505         ixgb_check_options(adapter);
 506         /* reset the hardware with the new settings */
 507
 508         ixgb_reset(adapter);
 509
 510         cards_found++;
 511         return 0;
 512
 513 err_register:
 514 err_sw_init:
 515 err_eeprom:
 516         iounmap(adapter->hw.hw_addr);
 517 err_ioremap:
 518         free_netdev(netdev);
 519 err_alloc_etherdev:
 520         pci_release_regions(pdev);
 521 err_request_regions:
 522 err_dma_mask:
 523         pci_disable_device(pdev);
 524         return err;
 525 }
 526
 527 /**
 528  * ixgb_remove - Device Removal Routine
 529  * @pdev: PCI device information struct
 530  *
 531  * ixgb_remove is called by the PCI subsystem to alert the driver
 532  * that it should release a PCI device.  The could be caused by a
 533  * Hot-Plug event, or because the driver is going to be removed from
 534  * memory.
 535  **/
 536
 537 static void __devexit
 538 ixgb_remove(struct pci_dev *pdev)
 539 {
 540         struct net_device *netdev = pci_get_drvdata(pdev);
 541         struct ixgb_adapter *adapter = netdev_priv(netdev);
 542
 543         unregister_netdev(netdev);
 544
 545         iounmap(adapter->hw.hw_addr);
 546         pci_release_regions(pdev);
 547
 548         free_netdev(netdev);
 549 }
 550
 551 /**
 552  * ixgb_sw_init - Initialize general software structures (struct ixgb_adapter)
 553  * @adapter: board private structure to initialize
 554  *
 555  * ixgb_sw_init initializes the Adapter private data structure.
 556  * Fields are initialized based on PCI device information and
 557  * OS network device settings (MTU size).
 558  **/
 559
 560 static int __devinit
 561 ixgb_sw_init(struct ixgb_adapter *adapter)
 562 {
 563         struct ixgb_hw *hw = &adapter->hw;
 564         struct net_device *netdev = adapter->netdev;
 565         struct pci_dev *pdev = adapter->pdev;
 566
 567         /* PCI config space info */
 568
 569         hw->vendor_id = pdev->vendor;
 570         hw->device_id = pdev->device;
 571         hw->subsystem_vendor_id = pdev->subsystem_vendor;
 572         hw->subsystem_id = pdev->subsystem_device;
 573
 574         hw->max_frame_size = netdev->mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;
 575         adapter->rx_buffer_len = hw->max_frame_size;
 576
 577         if((hw->device_id == IXGB_DEVICE_ID_82597EX)
 578            || (hw->device_id == IXGB_DEVICE_ID_82597EX_CX4)
 579            || (hw->device_id == IXGB_DEVICE_ID_82597EX_LR)
 580            || (hw->device_id == IXGB_DEVICE_ID_82597EX_SR))
 581                         hw->mac_type = ixgb_82597;
 582         else {
 583                 /* should never have loaded on this device */
 584                 DPRINTK(PROBE, ERR, "unsupported device id\n");
 585         }
 586
 587         /* enable flow control to be programmed */
 588         hw->fc.send_xon = 1;
 589
 590         atomic_set(&adapter->irq_sem, 1);
 591         spin_lock_init(&adapter->tx_lock);
 592
 593         return 0;
 594 }
 595
 596 /**
 597  * ixgb_open - Called when a network interface is made active
 598  * @netdev: network interface device structure
 599  *
 600  * Returns 0 on success, negative value on failure
 601  *
 602  * The open entry point is called when a network interface is made
 603  * active by the system (IFF_UP).  At this point all resources needed
 604  * for transmit and receive operations are allocated, the interrupt
 605  * handler is registered with the OS, the watchdog timer is started,
 606  * and the stack is notified that the interface is ready.
 607  **/
 608
 609 static int
 610 ixgb_open(struct net_device *netdev)
 611 {
 612         struct ixgb_adapter *adapter = netdev_priv(netdev);
 613         int err;
 614
 615         /* allocate transmit descriptors */
 616
 617         if((err = ixgb_setup_tx_resources(adapter)))
 618                 goto err_setup_tx;
 619
 620         /* allocate receive descriptors */
 621
 622         if((err = ixgb_setup_rx_resources(adapter)))
 623                 goto err_setup_rx;
 624
 625         if((err = ixgb_up(adapter)))
 626                 goto err_up;
 627
 628         return 0;
 629
 630 err_up:
 631         ixgb_free_rx_resources(adapter);
 632 err_setup_rx:
 633         ixgb_free_tx_resources(adapter);
 634 err_setup_tx:
 635         ixgb_reset(adapter);
 636
 637         return err;
 638 }
 639
 640 /**
 641  * ixgb_close - Disables a network interface
 642  * @netdev: network interface device structure
 643  *
 644  * Returns 0, this is not allowed to fail
 645  *
 646  * The close entry point is called when an interface is de-activated
 647  * by the OS.  The hardware is still under the drivers control, but
 648  * needs to be disabled.  A global MAC reset is issued to stop the
 649  * hardware, and all transmit and receive resources are freed.
 650  **/
 651
 652 static int
 653 ixgb_close(struct net_device *netdev)
 654 {
 655         struct ixgb_adapter *adapter = netdev_priv(netdev);
 656
 657         ixgb_down(adapter, TRUE);
 658
 659         ixgb_free_tx_resources(adapter);
 660         ixgb_free_rx_resources(adapter);
 661
 662         return 0;
 663 }
 664
 665 /**
 666  * ixgb_setup_tx_resources - allocate Tx resources (Descriptors)
 667  * @adapter: board private structure
 668  *
 669  * Return 0 on success, negative on failure
 670  **/
 671
 672 int
 673 ixgb_setup_tx_resources(struct ixgb_adapter *adapter)
 674 {
 675         struct ixgb_desc_ring *txdr = &adapter->tx_ring;
 676         struct pci_dev *pdev = adapter->pdev;
 677         int size;
 678
 679         size = sizeof(struct ixgb_buffer) * txdr->count;
 680         txdr->buffer_info = vmalloc(size);
 681         if(!txdr->buffer_info) {
 682                 DPRINTK(PROBE, ERR,
 683                  "Unable to allocate transmit descriptor ring memory\n");
 684                 return -ENOMEM;
 685         }
 686         memset(txdr->buffer_info, 0, size);
 687
 688         /* round up to nearest 4K */
 689
 690         txdr->size = txdr->count * sizeof(struct ixgb_tx_desc);
 691         IXGB_ROUNDUP(txdr->size, 4096);
 692
 693         txdr->desc = pci_alloc_consistent(pdev, txdr->size, &txdr->dma);
 694         if(!txdr->desc) {
 695                 vfree(txdr->buffer_info);
 696                 DPRINTK(PROBE, ERR,
 697                  "Unable to allocate transmit descriptor memory\n");
 698                 return -ENOMEM;
 699         }
 700         memset(txdr->desc, 0, txdr->size);
 701
 702         txdr->next_to_use = 0;
 703         txdr->next_to_clean = 0;
 704
 705         return 0;
 706 }
 707
 708 /**
 709  * ixgb_configure_tx - Configure 82597 Transmit Unit after Reset.
 710  * @adapter: board private structure
 711  *
 712  * Configure the Tx unit of the MAC after a reset.
 713  **/
 714
 715 static void
 716 ixgb_configure_tx(struct ixgb_adapter *adapter)
 717 {
 718         uint64_t tdba = adapter->tx_ring.dma;
 719         uint32_t tdlen = adapter->tx_ring.count * sizeof(struct ixgb_tx_desc);
 720         uint32_t tctl;
 721         struct ixgb_hw *hw = &adapter->hw;
 722
 723         /* Setup the Base and Length of the Tx Descriptor Ring
 724          * tx_ring.dma can be either a 32 or 64 bit value
 725          */
 726
 727         IXGB_WRITE_REG(hw, TDBAL, (tdba & 0x00000000ffffffffULL));
 728         IXGB_WRITE_REG(hw, TDBAH, (tdba >> 32));
 729
 730         IXGB_WRITE_REG(hw, TDLEN, tdlen);
 731
 732         /* Setup the HW Tx Head and Tail descriptor pointers */
 733
 734         IXGB_WRITE_REG(hw, TDH, 0);
 735         IXGB_WRITE_REG(hw, TDT, 0);
 736
 737         /* don't set up txdctl, it induces performance problems if configured
 738          * incorrectly */
 739         /* Set the Tx Interrupt Delay register */
 740
 741         IXGB_WRITE_REG(hw, TIDV, adapter->tx_int_delay);
 742
 743         /* Program the Transmit Control Register */
 744
 745         tctl = IXGB_TCTL_TCE | IXGB_TCTL_TXEN | IXGB_TCTL_TPDE;
 746         IXGB_WRITE_REG(hw, TCTL, tctl);
 747
 748         /* Setup Transmit Descriptor Settings for this adapter */
 749         adapter->tx_cmd_type =
 750                 IXGB_TX_DESC_TYPE
 751                 | (adapter->tx_int_delay_enable ? IXGB_TX_DESC_CMD_IDE : 0);
 752 }
 753
 754 /**
 755  * ixgb_setup_rx_resources - allocate Rx resources (Descriptors)
 756  * @adapter: board private structure
 757  *
 758  * Returns 0 on success, negative on failure
 759  **/
 760
 761 int
 762 ixgb_setup_rx_resources(struct ixgb_adapter *adapter)
 763 {
 764         struct ixgb_desc_ring *rxdr = &adapter->rx_ring;
 765         struct pci_dev *pdev = adapter->pdev;
 766         int size;
 767
 768         size = sizeof(struct ixgb_buffer) * rxdr->count;
 769         rxdr->buffer_info = vmalloc(size);
 770         if(!rxdr->buffer_info) {
 771                 DPRINTK(PROBE, ERR,
 772                  "Unable to allocate receive descriptor ring\n");
 773                 return -ENOMEM;
 774         }
 775         memset(rxdr->buffer_info, 0, size);
 776
 777         /* Round up to nearest 4K */
 778
 779         rxdr->size = rxdr->count * sizeof(struct ixgb_rx_desc);
 780         IXGB_ROUNDUP(rxdr->size, 4096);
 781
 782         rxdr->desc = pci_alloc_consistent(pdev, rxdr->size, &rxdr->dma);
 783
 784         if(!rxdr->desc) {
 785                 vfree(rxdr->buffer_info);
 786                 DPRINTK(PROBE, ERR,
 787                  "Unable to allocate receive descriptors\n");
 788                 return -ENOMEM;
 789         }
 790         memset(rxdr->desc, 0, rxdr->size);
 791
 792         rxdr->next_to_clean = 0;
 793         rxdr->next_to_use = 0;
 794
 795         return 0;
 796 }
 797
 798 /**
 799  * ixgb_setup_rctl - configure the receive control register
 800  * @adapter: Board private structure
 801  **/
 802
 803 static void
 804 ixgb_setup_rctl(struct ixgb_adapter *adapter)
 805 {
 806         uint32_t rctl;
 807
 808         rctl = IXGB_READ_REG(&adapter->hw, RCTL);
 809
 810         rctl &= ~(3 << IXGB_RCTL_MO_SHIFT);
 811
 812         rctl |=
 813                 IXGB_RCTL_BAM | IXGB_RCTL_RDMTS_1_2 |
 814                 IXGB_RCTL_RXEN | IXGB_RCTL_CFF |
 815                 (adapter->hw.mc_filter_type << IXGB_RCTL_MO_SHIFT);
 816
 817         rctl |= IXGB_RCTL_SECRC;
 818
 819         if (adapter->rx_buffer_len <= IXGB_RXBUFFER_2048)
 820                 rctl |= IXGB_RCTL_BSIZE_2048;
 821         else if (adapter->rx_buffer_len <= IXGB_RXBUFFER_4096)
 822                 rctl |= IXGB_RCTL_BSIZE_4096;
 823         else if (adapter->rx_buffer_len <= IXGB_RXBUFFER_8192)
 824                 rctl |= IXGB_RCTL_BSIZE_8192;
 825         else if (adapter->rx_buffer_len <= IXGB_RXBUFFER_16384)
 826                 rctl |= IXGB_RCTL_BSIZE_16384;
 827
 828         IXGB_WRITE_REG(&adapter->hw, RCTL, rctl);
 829 }
 830
 831 /**
 832  * ixgb_configure_rx - Configure 82597 Receive Unit after Reset.
 833  * @adapter: board private structure
 834  *
 835  * Configure the Rx unit of the MAC after a reset.
 836  **/
 837
 838 static void
 839 ixgb_configure_rx(struct ixgb_adapter *adapter)
 840 {
 841         uint64_t rdba = adapter->rx_ring.dma;
 842         uint32_t rdlen = adapter->rx_ring.count * sizeof(struct ixgb_rx_desc);
 843         struct ixgb_hw *hw = &adapter->hw;
 844         uint32_t rctl;
 845         uint32_t rxcsum;
 846         uint32_t rxdctl;
 847
 848         /* make sure receives are disabled while setting up the descriptors */
 849
 850         rctl = IXGB_READ_REG(hw, RCTL);
 851         IXGB_WRITE_REG(hw, RCTL, rctl & ~IXGB_RCTL_RXEN);
 852
 853         /* set the Receive Delay Timer Register */
 854
 855         IXGB_WRITE_REG(hw, RDTR, adapter->rx_int_delay);
 856
 857         /* Setup the Base and Length of the Rx Descriptor Ring */
 858
 859         IXGB_WRITE_REG(hw, RDBAL, (rdba & 0x00000000ffffffffULL));
 860         IXGB_WRITE_REG(hw, RDBAH, (rdba >> 32));
 861
 862         IXGB_WRITE_REG(hw, RDLEN, rdlen);
 863
 864         /* Setup the HW Rx Head and Tail Descriptor Pointers */
 865         IXGB_WRITE_REG(hw, RDH, 0);
 866         IXGB_WRITE_REG(hw, RDT, 0);
 867
 868         /* set up pre-fetching of receive buffers so we get some before we
 869          * run out (default hardware behavior is to run out before fetching
 870          * more).  This sets up to fetch if HTHRESH rx descriptors are avail
 871          * and the descriptors in hw cache are below PTHRESH.  This avoids
 872          * the hardware behavior of fetching <=512 descriptors in a single
 873          * burst that pre-empts all other activity, usually causing fifo
 874          * overflows. */
 875         /* use WTHRESH to burst write 16 descriptors or burst when RXT0 */
 876         rxdctl = RXDCTL_WTHRESH_DEFAULT << IXGB_RXDCTL_WTHRESH_SHIFT |
 877                  RXDCTL_HTHRESH_DEFAULT << IXGB_RXDCTL_HTHRESH_SHIFT |
 878                  RXDCTL_PTHRESH_DEFAULT << IXGB_RXDCTL_PTHRESH_SHIFT;
 879         IXGB_WRITE_REG(hw, RXDCTL, rxdctl);
 880
 881         /* Enable Receive Checksum Offload for TCP and UDP */
 882         if(adapter->rx_csum == TRUE) {
 883                 rxcsum = IXGB_READ_REG(hw, RXCSUM);
 884                 rxcsum |= IXGB_RXCSUM_TUOFL;
 885                 IXGB_WRITE_REG(hw, RXCSUM, rxcsum);
 886         }
 887
 888         /* Enable Receives */
 889
 890         IXGB_WRITE_REG(hw, RCTL, rctl);
 891 }
 892
 893 /**
 894  * ixgb_free_tx_resources - Free Tx Resources
 895  * @adapter: board private structure
 896  *
 897  * Free all transmit software resources
 898  **/
 899
 900 void
 901 ixgb_free_tx_resources(struct ixgb_adapter *adapter)
 902 {
 903         struct pci_dev *pdev = adapter->pdev;
 904
 905         ixgb_clean_tx_ring(adapter);
 906
 907         vfree(adapter->tx_ring.buffer_info);
 908         adapter->tx_ring.buffer_info = NULL;
 909
 910         pci_free_consistent(pdev, adapter->tx_ring.size,
 911                             adapter->tx_ring.desc, adapter->tx_ring.dma);
 912
 913         adapter->tx_ring.desc = NULL;
 914 }
 915
 916 static void
 917 ixgb_unmap_and_free_tx_resource(struct ixgb_adapter *adapter,
 918                                         struct ixgb_buffer *buffer_info)
 919 {
 920         struct pci_dev *pdev = adapter->pdev;
 921
 922         if (buffer_info->dma)
 923                 pci_unmap_page(pdev, buffer_info->dma, buffer_info->length,
 924                                PCI_DMA_TODEVICE);
 925
 926         if (buffer_info->skb)
 927                 dev_kfree_skb_any(buffer_info->skb);
 928
 929         buffer_info->skb = NULL;
 930         buffer_info->dma = 0;
 931         buffer_info->time_stamp = 0;
 932         /* these fields must always be initialized in tx
 933          * buffer_info->length = 0;
 934          * buffer_info->next_to_watch = 0; */
 935 }
 936
 937 /**
 938  * ixgb_clean_tx_ring - Free Tx Buffers
 939  * @adapter: board private structure
 940  **/
 941
 942 static void
 943 ixgb_clean_tx_ring(struct ixgb_adapter *adapter)
 944 {
 945         struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
 946         struct ixgb_buffer *buffer_info;
 947         unsigned long size;
 948         unsigned int i;
 949
 950         /* Free all the Tx ring sk_buffs */
 951
 952         for(i = 0; i < tx_ring->count; i++) {
 953                 buffer_info = &tx_ring->buffer_info[i];
 954                 ixgb_unmap_and_free_tx_resource(adapter, buffer_info);
 955         }
 956
 957         size = sizeof(struct ixgb_buffer) * tx_ring->count;
 958         memset(tx_ring->buffer_info, 0, size);
 959
 960         /* Zero out the descriptor ring */
 961
 962         memset(tx_ring->desc, 0, tx_ring->size);
 963
 964         tx_ring->next_to_use = 0;
 965         tx_ring->next_to_clean = 0;
 966
 967         IXGB_WRITE_REG(&adapter->hw, TDH, 0);
 968         IXGB_WRITE_REG(&adapter->hw, TDT, 0);
 969 }
 970
 971 /**
 972  * ixgb_free_rx_resources - Free Rx Resources
 973  * @adapter: board private structure
 974  *
 975  * Free all receive software resources
 976  **/
 977
 978 void
 979 ixgb_free_rx_resources(struct ixgb_adapter *adapter)
 980 {
 981         struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
 982         struct pci_dev *pdev = adapter->pdev;
 983
 984         ixgb_clean_rx_ring(adapter);
 985
 986         vfree(rx_ring->buffer_info);
 987         rx_ring->buffer_info = NULL;
 988
 989         pci_free_consistent(pdev, rx_ring->size, rx_ring->desc, rx_ring->dma);
 990
 991         rx_ring->desc = NULL;
 992 }
 993
 994 /**
 995  * ixgb_clean_rx_ring - Free Rx Buffers
 996  * @adapter: board private structure
 997  **/
 998
 999 static void
1000 ixgb_clean_rx_ring(struct ixgb_adapter *adapter)
1001 {
1002         struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
1003         struct ixgb_buffer *buffer_info;
1004         struct pci_dev *pdev = adapter->pdev;
1005         unsigned long size;
1006         unsigned int i;
1007
1008         /* Free all the Rx ring sk_buffs */
1009
1010         for(i = 0; i < rx_ring->count; i++) {
1011                 buffer_info = &rx_ring->buffer_info[i];
1012                 if(buffer_info->skb) {
1013
1014                         pci_unmap_single(pdev,
1015                                          buffer_info->dma,
1016                                          buffer_info->length,
1017                                          PCI_DMA_FROMDEVICE);
1018
1019                         dev_kfree_skb(buffer_info->skb);
1020
1021                         buffer_info->skb = NULL;
1022                 }
1023         }
1024
1025         size = sizeof(struct ixgb_buffer) * rx_ring->count;
1026         memset(rx_ring->buffer_info, 0, size);
1027
1028         /* Zero out the descriptor ring */
1029
1030         memset(rx_ring->desc, 0, rx_ring->size);
1031
1032         rx_ring->next_to_clean = 0;
1033         rx_ring->next_to_use = 0;
1034
1035         IXGB_WRITE_REG(&adapter->hw, RDH, 0);
1036         IXGB_WRITE_REG(&adapter->hw, RDT, 0);
1037 }
1038
1039 /**
1040  * ixgb_set_mac - Change the Ethernet Address of the NIC
1041  * @netdev: network interface device structure
1042  * @p: pointer to an address structure
1043  *
1044  * Returns 0 on success, negative on failure
1045  **/
1046
1047 static int
1048 ixgb_set_mac(struct net_device *netdev, void *p)
1049 {
1050         struct ixgb_adapter *adapter = netdev_priv(netdev);
1051         struct sockaddr *addr = p;
1052
1053         if(!is_valid_ether_addr(addr->sa_data))
1054                 return -EADDRNOTAVAIL;
1055
1056         memcpy(netdev->dev_addr, addr->sa_data, netdev->addr_len);
1057
1058         ixgb_rar_set(&adapter->hw, addr->sa_data, 0);
1059
1060         return 0;
1061 }
1062
1063 /**
1064  * ixgb_set_multi - Multicast and Promiscuous mode set
1065  * @netdev: network interface device structure
1066  *
1067  * The set_multi entry point is called whenever the multicast address
1068  * list or the network interface flags are updated.  This routine is
1069  * responsible for configuring the hardware for proper multicast,
1070  * promiscuous mode, and all-multi behavior.
1071  **/
1072
1073 static void
1074 ixgb_set_multi(struct net_device *netdev)
1075 {
1076         struct ixgb_adapter *adapter = netdev_priv(netdev);
1077         struct ixgb_hw *hw = &adapter->hw;
1078         struct dev_mc_list *mc_ptr;
1079         uint32_t rctl;
1080         int i;
1081
1082         /* Check for Promiscuous and All Multicast modes */
1083
1084         rctl = IXGB_READ_REG(hw, RCTL);
1085
1086         if(netdev->flags & IFF_PROMISC) {
1087                 rctl |= (IXGB_RCTL_UPE | IXGB_RCTL_MPE);
1088         } else if(netdev->flags & IFF_ALLMULTI) {
1089                 rctl |= IXGB_RCTL_MPE;
1090                 rctl &= ~IXGB_RCTL_UPE;
1091         } else {
1092                 rctl &= ~(IXGB_RCTL_UPE | IXGB_RCTL_MPE);
1093         }
1094
1095         if(netdev->mc_count > IXGB_MAX_NUM_MULTICAST_ADDRESSES) {
1096                 rctl |= IXGB_RCTL_MPE;
1097                 IXGB_WRITE_REG(hw, RCTL, rctl);
1098         } else {
1099                 uint8_t mta[netdev->mc_count * IXGB_ETH_LENGTH_OF_ADDRESS];
1100
1101                 IXGB_WRITE_REG(hw, RCTL, rctl);
1102
1103                 for(i = 0, mc_ptr = netdev->mc_list; mc_ptr;
1104                         i++, mc_ptr = mc_ptr->next)
1105                         memcpy(&mta[i * IXGB_ETH_LENGTH_OF_ADDRESS],
1106                                    mc_ptr->dmi_addr, IXGB_ETH_LENGTH_OF_ADDRESS);
1107
1108                 ixgb_mc_addr_list_update(hw, mta, netdev->mc_count, 0);
1109         }
1110 }
1111
1112 /**
1113  * ixgb_watchdog - Timer Call-back
1114  * @data: pointer to netdev cast into an unsigned long
1115  **/
1116
1117 static void
1118 ixgb_watchdog(unsigned long data)
1119 {
1120         struct ixgb_adapter *adapter = (struct ixgb_adapter *)data;
1121         struct net_device *netdev = adapter->netdev;
1122         struct ixgb_desc_ring *txdr = &adapter->tx_ring;
1123
1124         ixgb_check_for_link(&adapter->hw);
1125
1126         if (ixgb_check_for_bad_link(&adapter->hw)) {
1127                 /* force the reset path */
1128                 netif_stop_queue(netdev);
1129         }
1130
1131         if(adapter->hw.link_up) {
1132                 if(!netif_carrier_ok(netdev)) {
1133                         DPRINTK(LINK, INFO,
1134                                 "NIC Link is Up 10000 Mbps Full Duplex\n");
1135                         adapter->link_speed = 10000;
1136                         adapter->link_duplex = FULL_DUPLEX;
1137                         netif_carrier_on(netdev);
1138                         netif_wake_queue(netdev);
1139                 }
1140         } else {
1141                 if(netif_carrier_ok(netdev)) {
1142                         adapter->link_speed = 0;
1143                         adapter->link_duplex = 0;
1144                         DPRINTK(LINK, INFO, "NIC Link is Down\n");
1145                         netif_carrier_off(netdev);
1146                         netif_stop_queue(netdev);
1147
1148                 }
1149         }
1150
1151         ixgb_update_stats(adapter);
1152
1153         if(!netif_carrier_ok(netdev)) {
1154                 if(IXGB_DESC_UNUSED(txdr) + 1 < txdr->count) {
1155                         /* We've lost link, so the controller stops DMA,
1156                          * but we've got queued Tx work that's never going
1157                          * to get done, so reset controller to flush Tx.
1158                          * (Do the reset outside of interrupt context). */
1159                         schedule_work(&adapter->tx_timeout_task);
1160                 }
1161         }
1162
1163         /* Force detection of hung controller every watchdog period */
1164         adapter->detect_tx_hung = TRUE;
1165
1166         /* generate an interrupt to force clean up of any stragglers */
1167         IXGB_WRITE_REG(&adapter->hw, ICS, IXGB_INT_TXDW);
1168
1169         /* Reset the timer */
1170         mod_timer(&adapter->watchdog_timer, jiffies + 2 * HZ);
1171 }
1172
1173 #define IXGB_TX_FLAGS_CSUM              0x00000001
1174 #define IXGB_TX_FLAGS_VLAN              0x00000002
1175 #define IXGB_TX_FLAGS_TSO               0x00000004
1176
1177 static int
1178 ixgb_tso(struct ixgb_adapter *adapter, struct sk_buff *skb)
1179 {
1180 #ifdef NETIF_F_TSO
1181         struct ixgb_context_desc *context_desc;
1182         unsigned int i;
1183         uint8_t ipcss, ipcso, tucss, tucso, hdr_len;
1184         uint16_t ipcse, tucse, mss;
1185         int err;
1186
1187         if (likely(skb_is_gso(skb))) {
1188                 struct ixgb_buffer *buffer_info;
1189                 if (skb_header_cloned(skb)) {
1190                         err = pskb_expand_head(skb, 0, 0, GFP_ATOMIC);
1191                         if (err)
1192                                 return err;
1193                 }
1194
1195                 hdr_len = ((skb->h.raw - skb->data) + (skb->h.th->doff << 2));
1196                 mss = skb_shinfo(skb)->gso_size;
1197                 skb->nh.iph->tot_len = 0;
1198                 skb->nh.iph->check = 0;
1199                 skb->h.th->check = ~csum_tcpudp_magic(skb->nh.iph->saddr,
1200                                                       skb->nh.iph->daddr,
1201                                                       0, IPPROTO_TCP, 0);
1202                 ipcss = skb->nh.raw - skb->data;
1203                 ipcso = (void *)&(skb->nh.iph->check) - (void *)skb->data;
1204                 ipcse = skb->h.raw - skb->data - 1;
1205                 tucss = skb->h.raw - skb->data;
1206                 tucso = (void *)&(skb->h.th->check) - (void *)skb->data;
1207                 tucse = 0;
1208
1209                 i = adapter->tx_ring.next_to_use;
1210                 context_desc = IXGB_CONTEXT_DESC(adapter->tx_ring, i);
1211                 buffer_info = &adapter->tx_ring.buffer_info[i];
1212                 WARN_ON(buffer_info->dma != 0);
1213
1214                 context_desc->ipcss = ipcss;
1215                 context_desc->ipcso = ipcso;
1216                 context_desc->ipcse = cpu_to_le16(ipcse);
1217                 context_desc->tucss = tucss;
1218                 context_desc->tucso = tucso;
1219                 context_desc->tucse = cpu_to_le16(tucse);
1220                 context_desc->mss = cpu_to_le16(mss);
1221                 context_desc->hdr_len = hdr_len;
1222                 context_desc->status = 0;
1223                 context_desc->cmd_type_len = cpu_to_le32(
1224                                                   IXGB_CONTEXT_DESC_TYPE
1225                                                 | IXGB_CONTEXT_DESC_CMD_TSE
1226                                                 | IXGB_CONTEXT_DESC_CMD_IP
1227                                                 | IXGB_CONTEXT_DESC_CMD_TCP
1228                                                 | IXGB_CONTEXT_DESC_CMD_IDE
1229                                                 | (skb->len - (hdr_len)));
1230
1231
1232                 if(++i == adapter->tx_ring.count) i = 0;
1233                 adapter->tx_ring.next_to_use = i;
1234
1235                 return 1;
1236         }
1237 #endif
1238
1239         return 0;
1240 }
1241
1242 static boolean_t
1243 ixgb_tx_csum(struct ixgb_adapter *adapter, struct sk_buff *skb)
1244 {
1245         struct ixgb_context_desc *context_desc;
1246         unsigned int i;
1247         uint8_t css, cso;
1248
1249         if(likely(skb->ip_summed == CHECKSUM_PARTIAL)) {
1250                 struct ixgb_buffer *buffer_info;
1251                 css = skb->h.raw - skb->data;
1252                 cso = (skb->h.raw + skb->csum) - skb->data;
1253
1254                 i = adapter->tx_ring.next_to_use;
1255                 context_desc = IXGB_CONTEXT_DESC(adapter->tx_ring, i);
1256                 buffer_info = &adapter->tx_ring.buffer_info[i];
1257                 WARN_ON(buffer_info->dma != 0);
1258
1259                 context_desc->tucss = css;
1260                 context_desc->tucso = cso;
1261                 context_desc->tucse = 0;
1262                 /* zero out any previously existing data in one instruction */
1263                 *(uint32_t *)&(context_desc->ipcss) = 0;
1264                 context_desc->status = 0;
1265                 context_desc->hdr_len = 0;
1266                 context_desc->mss = 0;
1267                 context_desc->cmd_type_len =
1268                         cpu_to_le32(IXGB_CONTEXT_DESC_TYPE
1269                                     | IXGB_TX_DESC_CMD_IDE);
1270
1271                 if(++i == adapter->tx_ring.count) i = 0;
1272                 adapter->tx_ring.next_to_use = i;
1273
1274                 return TRUE;
1275         }
1276
1277         return FALSE;
1278 }
1279
1280 #define IXGB_MAX_TXD_PWR        14
1281 #define IXGB_MAX_DATA_PER_TXD   (1<<IXGB_MAX_TXD_PWR)
1282
1283 static int
1284 ixgb_tx_map(struct ixgb_adapter *adapter, struct sk_buff *skb,
1285             unsigned int first)
1286 {
1287         struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
1288         struct ixgb_buffer *buffer_info;
1289         int len = skb->len;
1290         unsigned int offset = 0, size, count = 0, i;
1291
1292         unsigned int nr_frags = skb_shinfo(skb)->nr_frags;
1293         unsigned int f;
1294
1295         len -= skb->data_len;
1296
1297         i = tx_ring->next_to_use;
1298
1299         while(len) {
1300                 buffer_info = &tx_ring->buffer_info[i];
1301                 size = min(len, IXGB_MAX_DATA_PER_TXD);
1302                 buffer_info->length = size;
1303                 WARN_ON(buffer_info->dma != 0);
1304                 buffer_info->dma =
1305                         pci_map_single(adapter->pdev,
1306                                 skb->data + offset,
1307                                 size,
1308                                 PCI_DMA_TODEVICE);
1309                 buffer_info->time_stamp = jiffies;
1310                 buffer_info->next_to_watch = 0;
1311
1312                 len -= size;
1313                 offset += size;
1314                 count++;
1315                 if(++i == tx_ring->count) i = 0;
1316         }
1317
1318         for(f = 0; f < nr_frags; f++) {
1319                 struct skb_frag_struct *frag;
1320
1321                 frag = &skb_shinfo(skb)->frags[f];
1322                 len = frag->size;
1323                 offset = 0;
1324
1325                 while(len) {
1326                         buffer_info = &tx_ring->buffer_info[i];
1327                         size = min(len, IXGB_MAX_DATA_PER_TXD);
1328                         buffer_info->length = size;
1329                         buffer_info->dma =
1330                                 pci_map_page(adapter->pdev,
1331                                         frag->page,
1332                                         frag->page_offset + offset,
1333                                         size,
1334                                         PCI_DMA_TODEVICE);
1335                         buffer_info->time_stamp = jiffies;
1336                         buffer_info->next_to_watch = 0;
1337
1338                         len -= size;
1339                         offset += size;
1340                         count++;
1341                         if(++i == tx_ring->count) i = 0;
1342                 }
1343         }
1344         i = (i == 0) ? tx_ring->count - 1 : i - 1;
1345         tx_ring->buffer_info[i].skb = skb;
1346         tx_ring->buffer_info[first].next_to_watch = i;
1347
1348         return count;
1349 }
1350
1351 static void
1352 ixgb_tx_queue(struct ixgb_adapter *adapter, int count, int vlan_id,int tx_flags)
1353 {
1354         struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
1355         struct ixgb_tx_desc *tx_desc = NULL;
1356         struct ixgb_buffer *buffer_info;
1357         uint32_t cmd_type_len = adapter->tx_cmd_type;
1358         uint8_t status = 0;
1359         uint8_t popts = 0;
1360         unsigned int i;
1361
1362         if(tx_flags & IXGB_TX_FLAGS_TSO) {
1363                 cmd_type_len |= IXGB_TX_DESC_CMD_TSE;
1364                 popts |= (IXGB_TX_DESC_POPTS_IXSM | IXGB_TX_DESC_POPTS_TXSM);
1365         }
1366
1367         if(tx_flags & IXGB_TX_FLAGS_CSUM)
1368                 popts |= IXGB_TX_DESC_POPTS_TXSM;
1369
1370         if(tx_flags & IXGB_TX_FLAGS_VLAN) {
1371                 cmd_type_len |= IXGB_TX_DESC_CMD_VLE;
1372         }
1373
1374         i = tx_ring->next_to_use;
1375
1376         while(count--) {
1377                 buffer_info = &tx_ring->buffer_info[i];
1378                 tx_desc = IXGB_TX_DESC(*tx_ring, i);
1379                 tx_desc->buff_addr = cpu_to_le64(buffer_info->dma);
1380                 tx_desc->cmd_type_len =
1381                         cpu_to_le32(cmd_type_len | buffer_info->length);
1382                 tx_desc->status = status;
1383                 tx_desc->popts = popts;
1384                 tx_desc->vlan = cpu_to_le16(vlan_id);
1385
1386                 if(++i == tx_ring->count) i = 0;
1387         }
1388
1389         tx_desc->cmd_type_len |= cpu_to_le32(IXGB_TX_DESC_CMD_EOP
1390                                 | IXGB_TX_DESC_CMD_RS );
1391
1392         /* Force memory writes to complete before letting h/w
1393          * know there are new descriptors to fetch.  (Only
1394          * applicable for weak-ordered memory model archs,
1395          * such as IA-64). */
1396         wmb();
1397
1398         tx_ring->next_to_use = i;
1399         IXGB_WRITE_REG(&adapter->hw, TDT, i);
1400 }
1401
1402 /* Tx Descriptors needed, worst case */
1403 #define TXD_USE_COUNT(S) (((S) >> IXGB_MAX_TXD_PWR) + \
1404                          (((S) & (IXGB_MAX_DATA_PER_TXD - 1)) ? 1 : 0))
1405 #define DESC_NEEDED TXD_USE_COUNT(IXGB_MAX_DATA_PER_TXD) + \
1406         MAX_SKB_FRAGS * TXD_USE_COUNT(PAGE_SIZE) + 1
1407
1408 static int
1409 ixgb_xmit_frame(struct sk_buff *skb, struct net_device *netdev)
1410 {
1411         struct ixgb_adapter *adapter = netdev_priv(netdev);
1412         unsigned int first;
1413         unsigned int tx_flags = 0;
1414         unsigned long flags;
1415         int vlan_id = 0;
1416         int tso;
1417
1418         if(skb->len <= 0) {
1419                 dev_kfree_skb_any(skb);
1420                 return 0;
1421         }
1422
1423 #ifdef NETIF_F_LLTX
1424         local_irq_save(flags);
1425         if (!spin_trylock(&adapter->tx_lock)) {
1426                 /* Collision - tell upper layer to requeue */
1427                 local_irq_restore(flags);
1428                 return NETDEV_TX_LOCKED;
1429         }
1430 #else
1431         spin_lock_irqsave(&adapter->tx_lock, flags);
1432 #endif
1433
1434         if(unlikely(IXGB_DESC_UNUSED(&adapter->tx_ring) < DESC_NEEDED)) {
1435                 netif_stop_queue(netdev);
1436                 spin_unlock_irqrestore(&adapter->tx_lock, flags);
1437                 return NETDEV_TX_BUSY;
1438         }
1439
1440 #ifndef NETIF_F_LLTX
1441         spin_unlock_irqrestore(&adapter->tx_lock, flags);
1442 #endif
1443
1444         if(adapter->vlgrp && vlan_tx_tag_present(skb)) {
1445                 tx_flags |= IXGB_TX_FLAGS_VLAN;
1446                 vlan_id = vlan_tx_tag_get(skb);
1447         }
1448
1449         first = adapter->tx_ring.next_to_use;
1450
1451         tso = ixgb_tso(adapter, skb);
1452         if (tso < 0) {
1453                 dev_kfree_skb_any(skb);
1454 #ifdef NETIF_F_LLTX
1455                 spin_unlock_irqrestore(&adapter->tx_lock, flags);
1456 #endif
1457                 return NETDEV_TX_OK;
1458         }
1459
1460         if (likely(tso))
1461                 tx_flags |= IXGB_TX_FLAGS_TSO;
1462         else if(ixgb_tx_csum(adapter, skb))
1463                 tx_flags |= IXGB_TX_FLAGS_CSUM;
1464
1465         ixgb_tx_queue(adapter, ixgb_tx_map(adapter, skb, first), vlan_id,
1466                         tx_flags);
1467
1468         netdev->trans_start = jiffies;
1469
1470 #ifdef NETIF_F_LLTX
1471         /* Make sure there is space in the ring for the next send. */
1472         if(unlikely(IXGB_DESC_UNUSED(&adapter->tx_ring) < DESC_NEEDED))
1473                 netif_stop_queue(netdev);
1474
1475         spin_unlock_irqrestore(&adapter->tx_lock, flags);
1476
1477 #endif
1478         return NETDEV_TX_OK;
1479 }
1480
1481 /**
1482  * ixgb_tx_timeout - Respond to a Tx Hang
1483  * @netdev: network interface device structure
1484  **/
1485
1486 static void
1487 ixgb_tx_timeout(struct net_device *netdev)
1488 {
1489         struct ixgb_adapter *adapter = netdev_priv(netdev);
1490
1491         /* Do the reset outside of interrupt context */
1492         schedule_work(&adapter->tx_timeout_task);
1493 }
1494
1495 static void
1496 ixgb_tx_timeout_task(struct net_device *netdev)
1497 {
1498         struct ixgb_adapter *adapter = netdev_priv(netdev);
1499
1500         adapter->tx_timeout_count++;
1501         ixgb_down(adapter, TRUE);
1502         ixgb_up(adapter);
1503 }
1504
1505 /**
1506  * ixgb_get_stats - Get System Network Statistics
1507  * @netdev: network interface device structure
1508  *
1509  * Returns the address of the device statistics structure.
1510  * The statistics are actually updated from the timer callback.
1511  **/
1512
1513 static struct net_device_stats *
1514 ixgb_get_stats(struct net_device *netdev)
1515 {
1516         struct ixgb_adapter *adapter = netdev_priv(netdev);
1517
1518         return &adapter->net_stats;
1519 }
1520
1521 /**
1522  * ixgb_change_mtu - Change the Maximum Transfer Unit
1523  * @netdev: network interface device structure
1524  * @new_mtu: new value for maximum frame size
1525  *
1526  * Returns 0 on success, negative on failure
1527  **/
1528
1529 static int
1530 ixgb_change_mtu(struct net_device *netdev, int new_mtu)
1531 {
1532         struct ixgb_adapter *adapter = netdev_priv(netdev);
1533         int max_frame = new_mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;
1534         int old_max_frame = netdev->mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;
1535
1536
1537         if((max_frame < IXGB_MIN_ENET_FRAME_SIZE_WITHOUT_FCS + ENET_FCS_LENGTH)
1538            || (max_frame > IXGB_MAX_JUMBO_FRAME_SIZE + ENET_FCS_LENGTH)) {
1539                 DPRINTK(PROBE, ERR, "Invalid MTU setting %d\n", new_mtu);
1540                 return -EINVAL;
1541         }
1542
1543         adapter->rx_buffer_len = max_frame;
1544
1545         netdev->mtu = new_mtu;
1546
1547         if ((old_max_frame != max_frame) && netif_running(netdev)) {
1548                 ixgb_down(adapter, TRUE);
1549                 ixgb_up(adapter);
1550         }
1551
1552         return 0;
1553 }
1554
1555 /**
1556  * ixgb_update_stats - Update the board statistics counters.
1557  * @adapter: board private structure
1558  **/
1559
1560 void
1561 ixgb_update_stats(struct ixgb_adapter *adapter)
1562 {
1563         struct net_device *netdev = adapter->netdev;
1564         struct pci_dev *pdev = adapter->pdev;
1565
1566         /* Prevent stats update while adapter is being reset */
1567         if (pdev->error_state && pdev->error_state != pci_channel_io_normal)
1568                 return;
1569
1570         if((netdev->flags & IFF_PROMISC) || (netdev->flags & IFF_ALLMULTI) ||
1571            (netdev->mc_count > IXGB_MAX_NUM_MULTICAST_ADDRESSES)) {
1572                 u64 multi = IXGB_READ_REG(&adapter->hw, MPRCL);
1573                 u32 bcast_l = IXGB_READ_REG(&adapter->hw, BPRCL);
1574                 u32 bcast_h = IXGB_READ_REG(&adapter->hw, BPRCH);
1575                 u64 bcast = ((u64)bcast_h << 32) | bcast_l;
1576
1577                 multi |= ((u64)IXGB_READ_REG(&adapter->hw, MPRCH) << 32);
1578                 /* fix up multicast stats by removing broadcasts */
1579                 if(multi >= bcast)
1580                         multi -= bcast;
1581
1582                 adapter->stats.mprcl += (multi & 0xFFFFFFFF);
1583                 adapter->stats.mprch += (multi >> 32);
1584                 adapter->stats.bprcl += bcast_l;
1585                 adapter->stats.bprch += bcast_h;
1586         } else {
1587                 adapter->stats.mprcl += IXGB_READ_REG(&adapter->hw, MPRCL);
1588                 adapter->stats.mprch += IXGB_READ_REG(&adapter->hw, MPRCH);
1589                 adapter->stats.bprcl += IXGB_READ_REG(&adapter->hw, BPRCL);
1590                 adapter->stats.bprch += IXGB_READ_REG(&adapter->hw, BPRCH);
1591         }
1592         adapter->stats.tprl += IXGB_READ_REG(&adapter->hw, TPRL);
1593         adapter->stats.tprh += IXGB_READ_REG(&adapter->hw, TPRH);
1594         adapter->stats.gprcl += IXGB_READ_REG(&adapter->hw, GPRCL);
1595         adapter->stats.gprch += IXGB_READ_REG(&adapter->hw, GPRCH);
1596         adapter->stats.uprcl += IXGB_READ_REG(&adapter->hw, UPRCL);
1597         adapter->stats.uprch += IXGB_READ_REG(&adapter->hw, UPRCH);
1598         adapter->stats.vprcl += IXGB_READ_REG(&adapter->hw, VPRCL);
1599         adapter->stats.vprch += IXGB_READ_REG(&adapter->hw, VPRCH);
1600         adapter->stats.jprcl += IXGB_READ_REG(&adapter->hw, JPRCL);
1601         adapter->stats.jprch += IXGB_READ_REG(&adapter->hw, JPRCH);
1602         adapter->stats.gorcl += IXGB_READ_REG(&adapter->hw, GORCL);
1603         adapter->stats.gorch += IXGB_READ_REG(&adapter->hw, GORCH);
1604         adapter->stats.torl += IXGB_READ_REG(&adapter->hw, TORL);
1605         adapter->stats.torh += IXGB_READ_REG(&adapter->hw, TORH);
1606         adapter->stats.rnbc += IXGB_READ_REG(&adapter->hw, RNBC);
1607         adapter->stats.ruc += IXGB_READ_REG(&adapter->hw, RUC);
1608         adapter->stats.roc += IXGB_READ_REG(&adapter->hw, ROC);
1609         adapter->stats.rlec += IXGB_READ_REG(&adapter->hw, RLEC);
1610         adapter->stats.crcerrs += IXGB_READ_REG(&adapter->hw, CRCERRS);
1611         adapter->stats.icbc += IXGB_READ_REG(&adapter->hw, ICBC);
1612         adapter->stats.ecbc += IXGB_READ_REG(&adapter->hw, ECBC);
1613         adapter->stats.mpc += IXGB_READ_REG(&adapter->hw, MPC);
1614         adapter->stats.tptl += IXGB_READ_REG(&adapter->hw, TPTL);
1615         adapter->stats.tpth += IXGB_READ_REG(&adapter->hw, TPTH);
1616         adapter->stats.gptcl += IXGB_READ_REG(&adapter->hw, GPTCL);
1617         adapter->stats.gptch += IXGB_READ_REG(&adapter->hw, GPTCH);
1618         adapter->stats.bptcl += IXGB_READ_REG(&adapter->hw, BPTCL);
1619         adapter->stats.bptch += IXGB_READ_REG(&adapter->hw, BPTCH);
1620         adapter->stats.mptcl += IXGB_READ_REG(&adapter->hw, MPTCL);
1621         adapter->stats.mptch += IXGB_READ_REG(&adapter->hw, MPTCH);
1622         adapter->stats.uptcl += IXGB_READ_REG(&adapter->hw, UPTCL);
1623         adapter->stats.uptch += IXGB_READ_REG(&adapter->hw, UPTCH);
1624         adapter->stats.vptcl += IXGB_READ_REG(&adapter->hw, VPTCL);
1625         adapter->stats.vptch += IXGB_READ_REG(&adapter->hw, VPTCH);
1626         adapter->stats.jptcl += IXGB_READ_REG(&adapter->hw, JPTCL);
1627         adapter->stats.jptch += IXGB_READ_REG(&adapter->hw, JPTCH);
1628         adapter->stats.gotcl += IXGB_READ_REG(&adapter->hw, GOTCL);
1629         adapter->stats.gotch += IXGB_READ_REG(&adapter->hw, GOTCH);
1630         adapter->stats.totl += IXGB_READ_REG(&adapter->hw, TOTL);
1631         adapter->stats.toth += IXGB_READ_REG(&adapter->hw, TOTH);
1632         adapter->stats.dc += IXGB_READ_REG(&adapter->hw, DC);
1633         adapter->stats.plt64c += IXGB_READ_REG(&adapter->hw, PLT64C);
1634         adapter->stats.tsctc += IXGB_READ_REG(&adapter->hw, TSCTC);
1635         adapter->stats.tsctfc += IXGB_READ_REG(&adapter->hw, TSCTFC);
1636         adapter->stats.ibic += IXGB_READ_REG(&adapter->hw, IBIC);
1637         adapter->stats.rfc += IXGB_READ_REG(&adapter->hw, RFC);
1638         adapter->stats.lfc += IXGB_READ_REG(&adapter->hw, LFC);
1639         adapter->stats.pfrc += IXGB_READ_REG(&adapter->hw, PFRC);
1640         adapter->stats.pftc += IXGB_READ_REG(&adapter->hw, PFTC);
1641         adapter->stats.mcfrc += IXGB_READ_REG(&adapter->hw, MCFRC);
1642         adapter->stats.mcftc += IXGB_READ_REG(&adapter->hw, MCFTC);
1643         adapter->stats.xonrxc += IXGB_READ_REG(&adapter->hw, XONRXC);
1644         adapter->stats.xontxc += IXGB_READ_REG(&adapter->hw, XONTXC);
1645         adapter->stats.xoffrxc += IXGB_READ_REG(&adapter->hw, XOFFRXC);
1646         adapter->stats.xofftxc += IXGB_READ_REG(&adapter->hw, XOFFTXC);
1647         adapter->stats.rjc += IXGB_READ_REG(&adapter->hw, RJC);
1648
1649         /* Fill out the OS statistics structure */
1650
1651         adapter->net_stats.rx_packets = adapter->stats.gprcl;
1652         adapter->net_stats.tx_packets = adapter->stats.gptcl;
1653         adapter->net_stats.rx_bytes = adapter->stats.gorcl;
1654         adapter->net_stats.tx_bytes = adapter->stats.gotcl;
1655         adapter->net_stats.multicast = adapter->stats.mprcl;
1656         adapter->net_stats.collisions = 0;
1657
1658         /* ignore RLEC as it reports errors for padded (<64bytes) frames
1659          * with a length in the type/len field */
1660         adapter->net_stats.rx_errors =
1661             /* adapter->stats.rnbc + */ adapter->stats.crcerrs +
1662             adapter->stats.ruc +
1663             adapter->stats.roc /*+ adapter->stats.rlec */  +
1664             adapter->stats.icbc +
1665             adapter->stats.ecbc + adapter->stats.mpc;
1666
1667         /* see above
1668          * adapter->net_stats.rx_length_errors = adapter->stats.rlec;
1669          */
1670
1671         adapter->net_stats.rx_crc_errors = adapter->stats.crcerrs;
1672         adapter->net_stats.rx_fifo_errors = adapter->stats.mpc;
1673         adapter->net_stats.rx_missed_errors = adapter->stats.mpc;
1674         adapter->net_stats.rx_over_errors = adapter->stats.mpc;
1675
1676         adapter->net_stats.tx_errors = 0;
1677         adapter->net_stats.rx_frame_errors = 0;
1678         adapter->net_stats.tx_aborted_errors = 0;
1679         adapter->net_stats.tx_carrier_errors = 0;
1680         adapter->net_stats.tx_fifo_errors = 0;
1681         adapter->net_stats.tx_heartbeat_errors = 0;
1682         adapter->net_stats.tx_window_errors = 0;
1683 }
1684
1685 #define IXGB_MAX_INTR 10
1686 /**
1687  * ixgb_intr - Interrupt Handler
1688  * @irq: interrupt number
1689  * @data: pointer to a network interface device structure
1690  **/
1691
1692 static irqreturn_t
1693 ixgb_intr(int irq, void *data)
1694 {
1695         struct net_device *netdev = data;
1696         struct ixgb_adapter *adapter = netdev_priv(netdev);
1697         struct ixgb_hw *hw = &adapter->hw;
1698         uint32_t icr = IXGB_READ_REG(hw, ICR);
1699 #ifndef CONFIG_IXGB_NAPI
1700         unsigned int i;
1701 #endif
1702
1703         if(unlikely(!icr))
1704                 return IRQ_NONE;  /* Not our interrupt */
1705
1706         if(unlikely(icr & (IXGB_INT_RXSEQ | IXGB_INT_LSC))) {
1707                 mod_timer(&adapter->watchdog_timer, jiffies);
1708         }
1709
1710 #ifdef CONFIG_IXGB_NAPI
1711         if(netif_rx_schedule_prep(netdev)) {
1712
1713                 /* Disable interrupts and register for poll. The flush
1714                   of the posted write is intentionally left out.
1715                 */
1716
1717                 atomic_inc(&adapter->irq_sem);
1718                 IXGB_WRITE_REG(&adapter->hw, IMC, ~0);
1719                 __netif_rx_schedule(netdev);
1720         }
1721 #else
1722         /* yes, that is actually a & and it is meant to make sure that
1723          * every pass through this for loop checks both receive and
1724          * transmit queues for completed descriptors, intended to
1725          * avoid starvation issues and assist tx/rx fairness. */
1726         for(i = 0; i < IXGB_MAX_INTR; i++)
1727                 if(!ixgb_clean_rx_irq(adapter) &
1728                    !ixgb_clean_tx_irq(adapter))
1729                         break;
1730 #endif
1731         return IRQ_HANDLED;
1732 }
1733
1734 #ifdef CONFIG_IXGB_NAPI
1735 /**
1736  * ixgb_clean - NAPI Rx polling callback
1737  * @adapter: board private structure
1738  **/
1739
1740 static int
1741 ixgb_clean(struct net_device *netdev, int *budget)
1742 {
1743         struct ixgb_adapter *adapter = netdev_priv(netdev);
1744         int work_to_do = min(*budget, netdev->quota);
1745         int tx_cleaned;
1746         int work_done = 0;
1747
1748         tx_cleaned = ixgb_clean_tx_irq(adapter);
1749         ixgb_clean_rx_irq(adapter, &work_done, work_to_do);
1750
1751         *budget -= work_done;
1752         netdev->quota -= work_done;
1753
1754         /* if no Tx and not enough Rx work done, exit the polling mode */
1755         if((!tx_cleaned && (work_done == 0)) || !netif_running(netdev)) {
1756                 netif_rx_complete(netdev);
1757                 ixgb_irq_enable(adapter);
1758                 return 0;
1759         }
1760
1761         return 1;
1762 }
1763 #endif
1764
1765 /**
1766  * ixgb_clean_tx_irq - Reclaim resources after transmit completes
1767  * @adapter: board private structure
1768  **/
1769
1770 static boolean_t
1771 ixgb_clean_tx_irq(struct ixgb_adapter *adapter)
1772 {
1773         struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
1774         struct net_device *netdev = adapter->netdev;
1775         struct ixgb_tx_desc *tx_desc, *eop_desc;
1776         struct ixgb_buffer *buffer_info;
1777         unsigned int i, eop;
1778         boolean_t cleaned = FALSE;
1779
1780         i = tx_ring->next_to_clean;
1781         eop = tx_ring->buffer_info[i].next_to_watch;
1782         eop_desc = IXGB_TX_DESC(*tx_ring, eop);
1783
1784         while(eop_desc->status & IXGB_TX_DESC_STATUS_DD) {
1785
1786                 for(cleaned = FALSE; !cleaned; ) {
1787                         tx_desc = IXGB_TX_DESC(*tx_ring, i);
1788                         buffer_info = &tx_ring->buffer_info[i];
1789
1790                         if (tx_desc->popts
1791                             & (IXGB_TX_DESC_POPTS_TXSM |
1792                                IXGB_TX_DESC_POPTS_IXSM))
1793                                 adapter->hw_csum_tx_good++;
1794
1795                         ixgb_unmap_and_free_tx_resource(adapter, buffer_info);
1796
1797                         *(uint32_t *)&(tx_desc->status) = 0;
1798
1799                         cleaned = (i == eop);
1800                         if(++i == tx_ring->count) i = 0;
1801                 }
1802
1803                 eop = tx_ring->buffer_info[i].next_to_watch;
1804                 eop_desc = IXGB_TX_DESC(*tx_ring, eop);
1805         }
1806
1807         tx_ring->next_to_clean = i;
1808
1809         if (unlikely(netif_queue_stopped(netdev))) {
1810                 spin_lock(&adapter->tx_lock);
1811                 if (netif_queue_stopped(netdev) && netif_carrier_ok(netdev) &&
1812                     (IXGB_DESC_UNUSED(tx_ring) >= DESC_NEEDED))
1813                         netif_wake_queue(netdev);
1814                 spin_unlock(&adapter->tx_lock);
1815         }
1816
1817         if(adapter->detect_tx_hung) {
1818                 /* detect a transmit hang in hardware, this serializes the
1819                  * check with the clearing of time_stamp and movement of i */
1820                 adapter->detect_tx_hung = FALSE;
1821                 if (tx_ring->buffer_info[eop].dma &&
1822                    time_after(jiffies, tx_ring->buffer_info[eop].time_stamp + HZ)
1823                    && !(IXGB_READ_REG(&adapter->hw, STATUS) &
1824                         IXGB_STATUS_TXOFF)) {
1825                         /* detected Tx unit hang */
1826                         DPRINTK(DRV, ERR, "Detected Tx Unit Hang\n"
1827                                         "  TDH                  <%x>\n"
1828                                         "  TDT                  <%x>\n"
1829                                         "  next_to_use          <%x>\n"
1830                                         "  next_to_clean        <%x>\n"
1831                                         "buffer_info[next_to_clean]\n"
1832                                         "  time_stamp           <%lx>\n"
1833                                         "  next_to_watch        <%x>\n"
1834                                         "  jiffies              <%lx>\n"
1835                                         "  next_to_watch.status <%x>\n",
1836                                 IXGB_READ_REG(&adapter->hw, TDH),
1837                                 IXGB_READ_REG(&adapter->hw, TDT),
1838                                 tx_ring->next_to_use,
1839                                 tx_ring->next_to_clean,
1840                                 tx_ring->buffer_info[eop].time_stamp,
1841                                 eop,
1842                                 jiffies,
1843                                 eop_desc->status);
1844                         netif_stop_queue(netdev);
1845                 }
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 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                 buffer_info->skb = NULL;
1923
1924                 prefetch(skb->data);
1925
1926                 if(++i == rx_ring->count) i = 0;
1927                 next_rxd = IXGB_RX_DESC(*rx_ring, i);
1928                 prefetch(next_rxd);
1929
1930                 if((j = i + 1) == rx_ring->count) j = 0;
1931                 next2_buffer = &rx_ring->buffer_info[j];
1932                 prefetch(next2_buffer);
1933
1934                 next_buffer = &rx_ring->buffer_info[i];
1935                 next_skb = next_buffer->skb;
1936                 prefetch(next_skb);
1937
1938                 cleaned = TRUE;
1939
1940                 pci_unmap_single(pdev,
1941                                  buffer_info->dma,
1942                                  buffer_info->length,
1943                                  PCI_DMA_FROMDEVICE);
1944
1945                 length = le16_to_cpu(rx_desc->length);
1946
1947                 if(unlikely(!(status & IXGB_RX_DESC_STATUS_EOP))) {
1948
1949                         /* All receives must fit into a single buffer */
1950
1951                         IXGB_DBG("Receive packet consumed multiple buffers "
1952                                          "length<%x>\n", length);
1953
1954                         dev_kfree_skb_irq(skb);
1955                         goto rxdesc_done;
1956                 }
1957
1958                 if (unlikely(rx_desc->errors
1959                              & (IXGB_RX_DESC_ERRORS_CE | IXGB_RX_DESC_ERRORS_SE
1960                                 | IXGB_RX_DESC_ERRORS_P |
1961                                 IXGB_RX_DESC_ERRORS_RXE))) {
1962
1963                         dev_kfree_skb_irq(skb);
1964                         goto rxdesc_done;
1965                 }
1966
1967                 /* code added for copybreak, this should improve
1968                  * performance for small packets with large amounts
1969                  * of reassembly being done in the stack */
1970 #define IXGB_CB_LENGTH 256
1971                 if (length < IXGB_CB_LENGTH) {
1972                         struct sk_buff *new_skb =
1973                             netdev_alloc_skb(netdev, length + NET_IP_ALIGN);
1974                         if (new_skb) {
1975                                 skb_reserve(new_skb, NET_IP_ALIGN);
1976                                 memcpy(new_skb->data - NET_IP_ALIGN,
1977                                        skb->data - NET_IP_ALIGN,
1978                                        length + NET_IP_ALIGN);
1979                                 /* save the skb in buffer_info as good */
1980                                 buffer_info->skb = skb;
1981                                 skb = new_skb;
1982                         }
1983                 }
1984                 /* end copybreak code */
1985
1986                 /* Good Receive */
1987                 skb_put(skb, length);
1988
1989                 /* Receive Checksum Offload */
1990                 ixgb_rx_checksum(adapter, rx_desc, skb);
1991
1992                 skb->protocol = eth_type_trans(skb, netdev);
1993 #ifdef CONFIG_IXGB_NAPI
1994                 if(adapter->vlgrp && (status & IXGB_RX_DESC_STATUS_VP)) {
1995                         vlan_hwaccel_receive_skb(skb, adapter->vlgrp,
1996                                 le16_to_cpu(rx_desc->special) &
1997                                         IXGB_RX_DESC_SPECIAL_VLAN_MASK);
1998                 } else {
1999                         netif_receive_skb(skb);
2000                 }
2001 #else /* CONFIG_IXGB_NAPI */
2002                 if(adapter->vlgrp && (status & IXGB_RX_DESC_STATUS_VP)) {
2003                         vlan_hwaccel_rx(skb, adapter->vlgrp,
2004                                 le16_to_cpu(rx_desc->special) &
2005                                         IXGB_RX_DESC_SPECIAL_VLAN_MASK);
2006                 } else {
2007                         netif_rx(skb);
2008                 }
2009 #endif /* CONFIG_IXGB_NAPI */
2010                 netdev->last_rx = jiffies;
2011
2012 rxdesc_done:
2013                 /* clean up descriptor, might be written over by hw */
2014                 rx_desc->status = 0;
2015
2016                 /* use prefetched values */
2017                 rx_desc = next_rxd;
2018                 buffer_info = next_buffer;
2019         }
2020
2021         rx_ring->next_to_clean = i;
2022
2023         ixgb_alloc_rx_buffers(adapter);
2024
2025         return cleaned;
2026 }
2027
2028 /**
2029  * ixgb_alloc_rx_buffers - Replace used receive buffers
2030  * @adapter: address of board private structure
2031  **/
2032
2033 static void
2034 ixgb_alloc_rx_buffers(struct ixgb_adapter *adapter)
2035 {
2036         struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
2037         struct net_device *netdev = adapter->netdev;
2038         struct pci_dev *pdev = adapter->pdev;
2039         struct ixgb_rx_desc *rx_desc;
2040         struct ixgb_buffer *buffer_info;
2041         struct sk_buff *skb;
2042         unsigned int i;
2043         int num_group_tail_writes;
2044         long cleancount;
2045
2046         i = rx_ring->next_to_use;
2047         buffer_info = &rx_ring->buffer_info[i];
2048         cleancount = IXGB_DESC_UNUSED(rx_ring);
2049
2050         num_group_tail_writes = IXGB_RX_BUFFER_WRITE;
2051
2052         /* leave three descriptors unused */
2053         while(--cleancount > 2) {
2054                 /* recycle! its good for you */
2055                 skb = buffer_info->skb;
2056                 if (skb) {
2057                         skb_trim(skb, 0);
2058                         goto map_skb;
2059                 }
2060
2061                 skb = netdev_alloc_skb(netdev, adapter->rx_buffer_len
2062                                        + NET_IP_ALIGN);
2063                 if (unlikely(!skb)) {
2064                         /* Better luck next round */
2065                         adapter->alloc_rx_buff_failed++;
2066                         break;
2067                 }
2068
2069                 /* Make buffer alignment 2 beyond a 16 byte boundary
2070                  * this will result in a 16 byte aligned IP header after
2071                  * the 14 byte MAC header is removed
2072                  */
2073                 skb_reserve(skb, NET_IP_ALIGN);
2074
2075                 buffer_info->skb = skb;
2076                 buffer_info->length = adapter->rx_buffer_len;
2077 map_skb:
2078                 buffer_info->dma = pci_map_single(pdev,
2079                                                   skb->data,
2080                                                   adapter->rx_buffer_len,
2081                                                   PCI_DMA_FROMDEVICE);
2082
2083                 rx_desc = IXGB_RX_DESC(*rx_ring, i);
2084                 rx_desc->buff_addr = cpu_to_le64(buffer_info->dma);
2085                 /* guarantee DD bit not set now before h/w gets descriptor
2086                  * this is the rest of the workaround for h/w double
2087                  * writeback. */
2088                 rx_desc->status = 0;
2089
2090
2091                 if(++i == rx_ring->count) i = 0;
2092                 buffer_info = &rx_ring->buffer_info[i];
2093         }
2094
2095         if (likely(rx_ring->next_to_use != i)) {
2096                 rx_ring->next_to_use = i;
2097                 if (unlikely(i-- == 0))
2098                         i = (rx_ring->count - 1);
2099
2100                 /* Force memory writes to complete before letting h/w
2101                  * know there are new descriptors to fetch.  (Only
2102                  * applicable for weak-ordered memory model archs, such
2103                  * as IA-64). */
2104                 wmb();
2105                 IXGB_WRITE_REG(&adapter->hw, RDT, i);
2106         }
2107 }
2108
2109 /**
2110  * ixgb_vlan_rx_register - enables or disables vlan tagging/stripping.
2111  *
2112  * @param netdev network interface device structure
2113  * @param grp indicates to enable or disable tagging/stripping
2114  **/
2115 static void
2116 ixgb_vlan_rx_register(struct net_device *netdev, struct vlan_group *grp)
2117 {
2118         struct ixgb_adapter *adapter = netdev_priv(netdev);
2119         uint32_t ctrl, rctl;
2120
2121         ixgb_irq_disable(adapter);
2122         adapter->vlgrp = grp;
2123
2124         if(grp) {
2125                 /* enable VLAN tag insert/strip */
2126                 ctrl = IXGB_READ_REG(&adapter->hw, CTRL0);
2127                 ctrl |= IXGB_CTRL0_VME;
2128                 IXGB_WRITE_REG(&adapter->hw, CTRL0, ctrl);
2129
2130                 /* enable VLAN receive filtering */
2131
2132                 rctl = IXGB_READ_REG(&adapter->hw, RCTL);
2133                 rctl |= IXGB_RCTL_VFE;
2134                 rctl &= ~IXGB_RCTL_CFIEN;
2135                 IXGB_WRITE_REG(&adapter->hw, RCTL, rctl);
2136         } else {
2137                 /* disable VLAN tag insert/strip */
2138
2139                 ctrl = IXGB_READ_REG(&adapter->hw, CTRL0);
2140                 ctrl &= ~IXGB_CTRL0_VME;
2141                 IXGB_WRITE_REG(&adapter->hw, CTRL0, ctrl);
2142
2143                 /* disable VLAN filtering */
2144
2145                 rctl = IXGB_READ_REG(&adapter->hw, RCTL);
2146                 rctl &= ~IXGB_RCTL_VFE;
2147                 IXGB_WRITE_REG(&adapter->hw, RCTL, rctl);
2148         }
2149
2150         ixgb_irq_enable(adapter);
2151 }
2152
2153 static void
2154 ixgb_vlan_rx_add_vid(struct net_device *netdev, uint16_t vid)
2155 {
2156         struct ixgb_adapter *adapter = netdev_priv(netdev);
2157         uint32_t vfta, index;
2158
2159         /* add VID to filter table */
2160
2161         index = (vid >> 5) & 0x7F;
2162         vfta = IXGB_READ_REG_ARRAY(&adapter->hw, VFTA, index);
2163         vfta |= (1 << (vid & 0x1F));
2164         ixgb_write_vfta(&adapter->hw, index, vfta);
2165 }
2166
2167 static void
2168 ixgb_vlan_rx_kill_vid(struct net_device *netdev, uint16_t vid)
2169 {
2170         struct ixgb_adapter *adapter = netdev_priv(netdev);
2171         uint32_t vfta, index;
2172
2173         ixgb_irq_disable(adapter);
2174
2175         if(adapter->vlgrp)
2176                 adapter->vlgrp->vlan_devices[vid] = NULL;
2177
2178         ixgb_irq_enable(adapter);
2179
2180         /* remove VID from filter table*/
2181
2182         index = (vid >> 5) & 0x7F;
2183         vfta = IXGB_READ_REG_ARRAY(&adapter->hw, VFTA, index);
2184         vfta &= ~(1 << (vid & 0x1F));
2185         ixgb_write_vfta(&adapter->hw, index, vfta);
2186 }
2187
2188 static void
2189 ixgb_restore_vlan(struct ixgb_adapter *adapter)
2190 {
2191         ixgb_vlan_rx_register(adapter->netdev, adapter->vlgrp);
2192
2193         if(adapter->vlgrp) {
2194                 uint16_t vid;
2195                 for(vid = 0; vid < VLAN_GROUP_ARRAY_LEN; vid++) {
2196                         if(!adapter->vlgrp->vlan_devices[vid])
2197                                 continue;
2198                         ixgb_vlan_rx_add_vid(adapter->netdev, vid);
2199                 }
2200         }
2201 }
2202
2203 #ifdef CONFIG_NET_POLL_CONTROLLER
2204 /*
2205  * Polling 'interrupt' - used by things like netconsole to send skbs
2206  * without having to re-enable interrupts. It's not called while
2207  * the interrupt routine is executing.
2208  */
2209
2210 static void ixgb_netpoll(struct net_device *dev)
2211 {
2212         struct ixgb_adapter *adapter = netdev_priv(dev);
2213
2214         disable_irq(adapter->pdev->irq);
2215         ixgb_intr(adapter->pdev->irq, dev);
2216         enable_irq(adapter->pdev->irq);
2217 }
2218 #endif
2219
2220 /**
2221  * ixgb_io_error_detected() - called when PCI error is detected
2222  * @pdev    pointer to pci device with error
2223  * @state   pci channel state after error
2224  *
2225  * This callback is called by the PCI subsystem whenever
2226  * a PCI bus error is detected.
2227  */
2228 static pci_ers_result_t ixgb_io_error_detected (struct pci_dev *pdev,
2229                                      enum pci_channel_state state)
2230 {
2231         struct net_device *netdev = pci_get_drvdata(pdev);
2232         struct ixgb_adapter *adapter = netdev_priv(netdev);
2233
2234         if(netif_running(netdev))
2235                 ixgb_down(adapter, TRUE);
2236
2237         pci_disable_device(pdev);
2238
2239         /* Request a slot reset. */
2240         return PCI_ERS_RESULT_NEED_RESET;
2241 }
2242
2243 /**
2244  * ixgb_io_slot_reset - called after the pci bus has been reset.
2245  * @pdev    pointer to pci device with error
2246  *
2247  * This callback is called after the PCI buss has been reset.
2248  * Basically, this tries to restart the card from scratch.
2249  * This is a shortened version of the device probe/discovery code,
2250  * it resembles the first-half of the ixgb_probe() routine.
2251  */
2252 static pci_ers_result_t ixgb_io_slot_reset (struct pci_dev *pdev)
2253 {
2254         struct net_device *netdev = pci_get_drvdata(pdev);
2255         struct ixgb_adapter *adapter = netdev_priv(netdev);
2256
2257         if(pci_enable_device(pdev)) {
2258                 DPRINTK(PROBE, ERR, "Cannot re-enable PCI device after reset.\n");
2259                 return PCI_ERS_RESULT_DISCONNECT;
2260         }
2261
2262         /* Perform card reset only on one instance of the card */
2263         if (0 != PCI_FUNC (pdev->devfn))
2264                 return PCI_ERS_RESULT_RECOVERED;
2265
2266         pci_set_master(pdev);
2267
2268         netif_carrier_off(netdev);
2269         netif_stop_queue(netdev);
2270         ixgb_reset(adapter);
2271
2272         /* Make sure the EEPROM is good */
2273         if(!ixgb_validate_eeprom_checksum(&adapter->hw)) {
2274                 DPRINTK(PROBE, ERR, "After reset, the EEPROM checksum is not valid.\n");
2275                 return PCI_ERS_RESULT_DISCONNECT;
2276         }
2277         ixgb_get_ee_mac_addr(&adapter->hw, netdev->dev_addr);
2278         memcpy(netdev->perm_addr, netdev->dev_addr, netdev->addr_len);
2279
2280         if(!is_valid_ether_addr(netdev->perm_addr)) {
2281                 DPRINTK(PROBE, ERR, "After reset, invalid MAC address.\n");
2282                 return PCI_ERS_RESULT_DISCONNECT;
2283         }
2284
2285         return PCI_ERS_RESULT_RECOVERED;
2286 }
2287
2288 /**
2289  * ixgb_io_resume - called when its OK to resume normal operations
2290  * @pdev    pointer to pci device with error
2291  *
2292  * The error recovery driver tells us that its OK to resume
2293  * normal operation. Implementation resembles the second-half
2294  * of the ixgb_probe() routine.
2295  */
2296 static void ixgb_io_resume (struct pci_dev *pdev)
2297 {
2298         struct net_device *netdev = pci_get_drvdata(pdev);
2299         struct ixgb_adapter *adapter = netdev_priv(netdev);
2300
2301         pci_set_master(pdev);
2302
2303         if(netif_running(netdev)) {
2304                 if(ixgb_up(adapter)) {
2305                         printk ("ixgb: can't bring device back up after reset\n");
2306                         return;
2307                 }
2308         }
2309
2310         netif_device_attach(netdev);
2311         mod_timer(&adapter->watchdog_timer, jiffies);
2312 }
2313
2314 /* ixgb_main.c */