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