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