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