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

   1 /*******************************************************************************
   2
   3
   4   Copyright(c) 1999 - 2005 Intel Corporation. All rights reserved.
   5
   6   This program is free software; you can redistribute it and/or modify it
   7   under the terms of the GNU General Public License as published by the Free
   8   Software Foundation; either version 2 of the License, or (at your option)
   9   any later version.
  10
  11   This program is distributed in the hope that it will be useful, but WITHOUT
  12   ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13   FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  14   more details.
  15
  16   You should have received a copy of the GNU General Public License along with
  17   this program; if not, write to the Free Software Foundation, Inc., 59
  18   Temple Place - Suite 330, Boston, MA  02111-1307, USA.
  19
  20   The full GNU General Public License is included in this distribution in the
  21   file called LICENSE.
  22
  23   Contact Information:
  24   Linux NICS <linux.nics@intel.com>
  25   Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
  26
  27 *******************************************************************************/
  28
  29 #include "ixgb.h"
  30
  31 /* Change Log
  32  * 1.0.96 04/19/05
  33  * - Make needlessly global code static -- bunk@stusta.de
  34  * - ethtool cleanup -- shemminger@osdl.org
  35  * - Support for MODULE_VERSION -- linville@tuxdriver.com
  36  * - add skb_header_cloned check to the tso path -- herbert@apana.org.au
  37  * 1.0.88 01/05/05
  38  * - include fix to the condition that determines when to quit NAPI - Robert Olsson
  39  * - use netif_poll_{disable/enable} to synchronize between NAPI and i/f up/down
  40  * 1.0.84 10/26/04
  41  * - reset buffer_info->dma in Tx resource cleanup logic
  42  * 1.0.83 10/12/04
  43  * - sparse cleanup - shemminger@osdl.org
  44  * - fix tx resource cleanup logic
  45  */
  46
  47 char ixgb_driver_name[] = "ixgb";
  48 static char ixgb_driver_string[] = "Intel(R) PRO/10GbE Network Driver";
  49
  50 #ifndef CONFIG_IXGB_NAPI
  51 #define DRIVERNAPI
  52 #else
  53 #define DRIVERNAPI "-NAPI"
  54 #endif
  55 #define DRV_VERSION             "1.0.100-k2"DRIVERNAPI
  56 char ixgb_driver_version[] = DRV_VERSION;
  57 static char ixgb_copyright[] = "Copyright (c) 1999-2005 Intel Corporation.";
  58
  59 /* ixgb_pci_tbl - PCI Device ID Table
  60  *
  61  * Wildcard entries (PCI_ANY_ID) should come last
  62  * Last entry must be all 0s
  63  *
  64  * { Vendor ID, Device ID, SubVendor ID, SubDevice ID,
  65  *   Class, Class Mask, private data (not used) }
  66  */
  67 static struct pci_device_id ixgb_pci_tbl[] = {
  68         {INTEL_VENDOR_ID, IXGB_DEVICE_ID_82597EX,
  69          PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
  70         {INTEL_VENDOR_ID, IXGB_DEVICE_ID_82597EX_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                 pci_using_dac = 1;
 362         } else {
 363                 if((err = pci_set_dma_mask(pdev, DMA_32BIT_MASK))) {
 364                         IXGB_ERR("No usable DMA configuration, aborting\n");
 365                         return err;
 366                 }
 367                 pci_using_dac = 0;
 368         }
 369
 370         if((err = pci_request_regions(pdev, ixgb_driver_name)))
 371                 return err;
 372
 373         pci_set_master(pdev);
 374
 375         netdev = alloc_etherdev(sizeof(struct ixgb_adapter));
 376         if(!netdev) {
 377                 err = -ENOMEM;
 378                 goto err_alloc_etherdev;
 379         }
 380
 381         SET_MODULE_OWNER(netdev);
 382         SET_NETDEV_DEV(netdev, &pdev->dev);
 383
 384         pci_set_drvdata(pdev, netdev);
 385         adapter = netdev_priv(netdev);
 386         adapter->netdev = netdev;
 387         adapter->pdev = pdev;
 388         adapter->hw.back = adapter;
 389
 390         mmio_start = pci_resource_start(pdev, BAR_0);
 391         mmio_len = pci_resource_len(pdev, BAR_0);
 392
 393         adapter->hw.hw_addr = ioremap(mmio_start, mmio_len);
 394         if(!adapter->hw.hw_addr) {
 395                 err = -EIO;
 396                 goto err_ioremap;
 397         }
 398
 399         for(i = BAR_1; i <= BAR_5; i++) {
 400                 if(pci_resource_len(pdev, i) == 0)
 401                         continue;
 402                 if(pci_resource_flags(pdev, i) & IORESOURCE_IO) {
 403                         adapter->hw.io_base = pci_resource_start(pdev, i);
 404                         break;
 405                 }
 406         }
 407
 408         netdev->open = &ixgb_open;
 409         netdev->stop = &ixgb_close;
 410         netdev->hard_start_xmit = &ixgb_xmit_frame;
 411         netdev->get_stats = &ixgb_get_stats;
 412         netdev->set_multicast_list = &ixgb_set_multi;
 413         netdev->set_mac_address = &ixgb_set_mac;
 414         netdev->change_mtu = &ixgb_change_mtu;
 415         ixgb_set_ethtool_ops(netdev);
 416         netdev->tx_timeout = &ixgb_tx_timeout;
 417         netdev->watchdog_timeo = HZ;
 418 #ifdef CONFIG_IXGB_NAPI
 419         netdev->poll = &ixgb_clean;
 420         netdev->weight = 64;
 421 #endif
 422         netdev->vlan_rx_register = ixgb_vlan_rx_register;
 423         netdev->vlan_rx_add_vid = ixgb_vlan_rx_add_vid;
 424         netdev->vlan_rx_kill_vid = ixgb_vlan_rx_kill_vid;
 425 #ifdef CONFIG_NET_POLL_CONTROLLER
 426         netdev->poll_controller = ixgb_netpoll;
 427 #endif
 428
 429         netdev->mem_start = mmio_start;
 430         netdev->mem_end = mmio_start + mmio_len;
 431         netdev->base_addr = adapter->hw.io_base;
 432
 433         adapter->bd_number = cards_found;
 434         adapter->link_speed = 0;
 435         adapter->link_duplex = 0;
 436
 437         /* setup the private structure */
 438
 439         if((err = ixgb_sw_init(adapter)))
 440                 goto err_sw_init;
 441
 442         netdev->features = NETIF_F_SG |
 443                            NETIF_F_HW_CSUM |
 444                            NETIF_F_HW_VLAN_TX |
 445                            NETIF_F_HW_VLAN_RX |
 446                            NETIF_F_HW_VLAN_FILTER;
 447 #ifdef NETIF_F_TSO
 448         netdev->features |= NETIF_F_TSO;
 449 #endif
 450
 451         if(pci_using_dac)
 452                 netdev->features |= NETIF_F_HIGHDMA;
 453
 454         /* make sure the EEPROM is good */
 455
 456         if(!ixgb_validate_eeprom_checksum(&adapter->hw)) {
 457                 printk(KERN_ERR "The EEPROM Checksum Is Not Valid\n");
 458                 err = -EIO;
 459                 goto err_eeprom;
 460         }
 461
 462         ixgb_get_ee_mac_addr(&adapter->hw, netdev->dev_addr);
 463         memcpy(netdev->perm_addr, netdev->dev_addr, netdev->addr_len);
 464
 465         if(!is_valid_ether_addr(netdev->perm_addr)) {
 466                 err = -EIO;
 467                 goto err_eeprom;
 468         }
 469
 470         adapter->part_num = ixgb_get_ee_pba_number(&adapter->hw);
 471
 472         init_timer(&adapter->watchdog_timer);
 473         adapter->watchdog_timer.function = &ixgb_watchdog;
 474         adapter->watchdog_timer.data = (unsigned long)adapter;
 475
 476         INIT_WORK(&adapter->tx_timeout_task,
 477                   (void (*)(void *))ixgb_tx_timeout_task, netdev);
 478
 479         if((err = register_netdev(netdev)))
 480                 goto err_register;
 481
 482         /* we're going to reset, so assume we have no link for now */
 483
 484         netif_carrier_off(netdev);
 485         netif_stop_queue(netdev);
 486
 487         printk(KERN_INFO "%s: Intel(R) PRO/10GbE Network Connection\n",
 488                    netdev->name);
 489         ixgb_check_options(adapter);
 490         /* reset the hardware with the new settings */
 491
 492         ixgb_reset(adapter);
 493
 494         cards_found++;
 495         return 0;
 496
 497 err_register:
 498 err_sw_init:
 499 err_eeprom:
 500         iounmap(adapter->hw.hw_addr);
 501 err_ioremap:
 502         free_netdev(netdev);
 503 err_alloc_etherdev:
 504         pci_release_regions(pdev);
 505         return err;
 506 }
 507
 508 /**
 509  * ixgb_remove - Device Removal Routine
 510  * @pdev: PCI device information struct
 511  *
 512  * ixgb_remove is called by the PCI subsystem to alert the driver
 513  * that it should release a PCI device.  The could be caused by a
 514  * Hot-Plug event, or because the driver is going to be removed from
 515  * memory.
 516  **/
 517
 518 static void __devexit
 519 ixgb_remove(struct pci_dev *pdev)
 520 {
 521         struct net_device *netdev = pci_get_drvdata(pdev);
 522         struct ixgb_adapter *adapter = netdev_priv(netdev);
 523
 524         unregister_netdev(netdev);
 525
 526         iounmap(adapter->hw.hw_addr);
 527         pci_release_regions(pdev);
 528
 529         free_netdev(netdev);
 530 }
 531
 532 /**
 533  * ixgb_sw_init - Initialize general software structures (struct ixgb_adapter)
 534  * @adapter: board private structure to initialize
 535  *
 536  * ixgb_sw_init initializes the Adapter private data structure.
 537  * Fields are initialized based on PCI device information and
 538  * OS network device settings (MTU size).
 539  **/
 540
 541 static int __devinit
 542 ixgb_sw_init(struct ixgb_adapter *adapter)
 543 {
 544         struct ixgb_hw *hw = &adapter->hw;
 545         struct net_device *netdev = adapter->netdev;
 546         struct pci_dev *pdev = adapter->pdev;
 547
 548         /* PCI config space info */
 549
 550         hw->vendor_id = pdev->vendor;
 551         hw->device_id = pdev->device;
 552         hw->subsystem_vendor_id = pdev->subsystem_vendor;
 553         hw->subsystem_id = pdev->subsystem_device;
 554
 555         adapter->rx_buffer_len = IXGB_RXBUFFER_2048;
 556
 557         hw->max_frame_size = netdev->mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;
 558
 559         if((hw->device_id == IXGB_DEVICE_ID_82597EX)
 560            ||(hw->device_id == IXGB_DEVICE_ID_82597EX_LR)
 561            ||(hw->device_id == IXGB_DEVICE_ID_82597EX_SR))
 562                         hw->mac_type = ixgb_82597;
 563         else {
 564                 /* should never have loaded on this device */
 565                 printk(KERN_ERR "ixgb: unsupported device id\n");
 566         }
 567
 568         /* enable flow control to be programmed */
 569         hw->fc.send_xon = 1;
 570
 571         atomic_set(&adapter->irq_sem, 1);
 572         spin_lock_init(&adapter->tx_lock);
 573
 574         return 0;
 575 }
 576
 577 /**
 578  * ixgb_open - Called when a network interface is made active
 579  * @netdev: network interface device structure
 580  *
 581  * Returns 0 on success, negative value on failure
 582  *
 583  * The open entry point is called when a network interface is made
 584  * active by the system (IFF_UP).  At this point all resources needed
 585  * for transmit and receive operations are allocated, the interrupt
 586  * handler is registered with the OS, the watchdog timer is started,
 587  * and the stack is notified that the interface is ready.
 588  **/
 589
 590 static int
 591 ixgb_open(struct net_device *netdev)
 592 {
 593         struct ixgb_adapter *adapter = netdev_priv(netdev);
 594         int err;
 595
 596         /* allocate transmit descriptors */
 597
 598         if((err = ixgb_setup_tx_resources(adapter)))
 599                 goto err_setup_tx;
 600
 601         /* allocate receive descriptors */
 602
 603         if((err = ixgb_setup_rx_resources(adapter)))
 604                 goto err_setup_rx;
 605
 606         if((err = ixgb_up(adapter)))
 607                 goto err_up;
 608
 609         return 0;
 610
 611 err_up:
 612         ixgb_free_rx_resources(adapter);
 613 err_setup_rx:
 614         ixgb_free_tx_resources(adapter);
 615 err_setup_tx:
 616         ixgb_reset(adapter);
 617
 618         return err;
 619 }
 620
 621 /**
 622  * ixgb_close - Disables a network interface
 623  * @netdev: network interface device structure
 624  *
 625  * Returns 0, this is not allowed to fail
 626  *
 627  * The close entry point is called when an interface is de-activated
 628  * by the OS.  The hardware is still under the drivers control, but
 629  * needs to be disabled.  A global MAC reset is issued to stop the
 630  * hardware, and all transmit and receive resources are freed.
 631  **/
 632
 633 static int
 634 ixgb_close(struct net_device *netdev)
 635 {
 636         struct ixgb_adapter *adapter = netdev_priv(netdev);
 637
 638         ixgb_down(adapter, TRUE);
 639
 640         ixgb_free_tx_resources(adapter);
 641         ixgb_free_rx_resources(adapter);
 642
 643         return 0;
 644 }
 645
 646 /**
 647  * ixgb_setup_tx_resources - allocate Tx resources (Descriptors)
 648  * @adapter: board private structure
 649  *
 650  * Return 0 on success, negative on failure
 651  **/
 652
 653 int
 654 ixgb_setup_tx_resources(struct ixgb_adapter *adapter)
 655 {
 656         struct ixgb_desc_ring *txdr = &adapter->tx_ring;
 657         struct pci_dev *pdev = adapter->pdev;
 658         int size;
 659
 660         size = sizeof(struct ixgb_buffer) * txdr->count;
 661         txdr->buffer_info = vmalloc(size);
 662         if(!txdr->buffer_info) {
 663                 return -ENOMEM;
 664         }
 665         memset(txdr->buffer_info, 0, size);
 666
 667         /* round up to nearest 4K */
 668
 669         txdr->size = txdr->count * sizeof(struct ixgb_tx_desc);
 670         IXGB_ROUNDUP(txdr->size, 4096);
 671
 672         txdr->desc = pci_alloc_consistent(pdev, txdr->size, &txdr->dma);
 673         if(!txdr->desc) {
 674                 vfree(txdr->buffer_info);
 675                 return -ENOMEM;
 676         }
 677         memset(txdr->desc, 0, txdr->size);
 678
 679         txdr->next_to_use = 0;
 680         txdr->next_to_clean = 0;
 681
 682         return 0;
 683 }
 684
 685 /**
 686  * ixgb_configure_tx - Configure 82597 Transmit Unit after Reset.
 687  * @adapter: board private structure
 688  *
 689  * Configure the Tx unit of the MAC after a reset.
 690  **/
 691
 692 static void
 693 ixgb_configure_tx(struct ixgb_adapter *adapter)
 694 {
 695         uint64_t tdba = adapter->tx_ring.dma;
 696         uint32_t tdlen = adapter->tx_ring.count * sizeof(struct ixgb_tx_desc);
 697         uint32_t tctl;
 698         struct ixgb_hw *hw = &adapter->hw;
 699
 700         /* Setup the Base and Length of the Tx Descriptor Ring
 701          * tx_ring.dma can be either a 32 or 64 bit value
 702          */
 703
 704         IXGB_WRITE_REG(hw, TDBAL, (tdba & 0x00000000ffffffffULL));
 705         IXGB_WRITE_REG(hw, TDBAH, (tdba >> 32));
 706
 707         IXGB_WRITE_REG(hw, TDLEN, tdlen);
 708
 709         /* Setup the HW Tx Head and Tail descriptor pointers */
 710
 711         IXGB_WRITE_REG(hw, TDH, 0);
 712         IXGB_WRITE_REG(hw, TDT, 0);
 713
 714         /* don't set up txdctl, it induces performance problems if configured
 715          * incorrectly */
 716         /* Set the Tx Interrupt Delay register */
 717
 718         IXGB_WRITE_REG(hw, TIDV, adapter->tx_int_delay);
 719
 720         /* Program the Transmit Control Register */
 721
 722         tctl = IXGB_TCTL_TCE | IXGB_TCTL_TXEN | IXGB_TCTL_TPDE;
 723         IXGB_WRITE_REG(hw, TCTL, tctl);
 724
 725         /* Setup Transmit Descriptor Settings for this adapter */
 726         adapter->tx_cmd_type =
 727                 IXGB_TX_DESC_TYPE
 728                 | (adapter->tx_int_delay_enable ? IXGB_TX_DESC_CMD_IDE : 0);
 729 }
 730
 731 /**
 732  * ixgb_setup_rx_resources - allocate Rx resources (Descriptors)
 733  * @adapter: board private structure
 734  *
 735  * Returns 0 on success, negative on failure
 736  **/
 737
 738 int
 739 ixgb_setup_rx_resources(struct ixgb_adapter *adapter)
 740 {
 741         struct ixgb_desc_ring *rxdr = &adapter->rx_ring;
 742         struct pci_dev *pdev = adapter->pdev;
 743         int size;
 744
 745         size = sizeof(struct ixgb_buffer) * rxdr->count;
 746         rxdr->buffer_info = vmalloc(size);
 747         if(!rxdr->buffer_info) {
 748                 return -ENOMEM;
 749         }
 750         memset(rxdr->buffer_info, 0, size);
 751
 752         /* Round up to nearest 4K */
 753
 754         rxdr->size = rxdr->count * sizeof(struct ixgb_rx_desc);
 755         IXGB_ROUNDUP(rxdr->size, 4096);
 756
 757         rxdr->desc = pci_alloc_consistent(pdev, rxdr->size, &rxdr->dma);
 758
 759         if(!rxdr->desc) {
 760                 vfree(rxdr->buffer_info);
 761                 return -ENOMEM;
 762         }
 763         memset(rxdr->desc, 0, rxdr->size);
 764
 765         rxdr->next_to_clean = 0;
 766         rxdr->next_to_use = 0;
 767
 768         return 0;
 769 }
 770
 771 /**
 772  * ixgb_setup_rctl - configure the receive control register
 773  * @adapter: Board private structure
 774  **/
 775
 776 static void
 777 ixgb_setup_rctl(struct ixgb_adapter *adapter)
 778 {
 779         uint32_t rctl;
 780
 781         rctl = IXGB_READ_REG(&adapter->hw, RCTL);
 782
 783         rctl &= ~(3 << IXGB_RCTL_MO_SHIFT);
 784
 785         rctl |=
 786                 IXGB_RCTL_BAM | IXGB_RCTL_RDMTS_1_2 |
 787                 IXGB_RCTL_RXEN | IXGB_RCTL_CFF |
 788                 (adapter->hw.mc_filter_type << IXGB_RCTL_MO_SHIFT);
 789
 790         rctl |= IXGB_RCTL_SECRC;
 791
 792         switch (adapter->rx_buffer_len) {
 793         case IXGB_RXBUFFER_2048:
 794         default:
 795                 rctl |= IXGB_RCTL_BSIZE_2048;
 796                 break;
 797         case IXGB_RXBUFFER_4096:
 798                 rctl |= IXGB_RCTL_BSIZE_4096;
 799                 break;
 800         case IXGB_RXBUFFER_8192:
 801                 rctl |= IXGB_RCTL_BSIZE_8192;
 802                 break;
 803         case IXGB_RXBUFFER_16384:
 804                 rctl |= IXGB_RCTL_BSIZE_16384;
 805                 break;
 806         }
 807
 808         IXGB_WRITE_REG(&adapter->hw, RCTL, rctl);
 809 }
 810
 811 /**
 812  * ixgb_configure_rx - Configure 82597 Receive Unit after Reset.
 813  * @adapter: board private structure
 814  *
 815  * Configure the Rx unit of the MAC after a reset.
 816  **/
 817
 818 static void
 819 ixgb_configure_rx(struct ixgb_adapter *adapter)
 820 {
 821         uint64_t rdba = adapter->rx_ring.dma;
 822         uint32_t rdlen = adapter->rx_ring.count * sizeof(struct ixgb_rx_desc);
 823         struct ixgb_hw *hw = &adapter->hw;
 824         uint32_t rctl;
 825         uint32_t rxcsum;
 826         uint32_t rxdctl;
 827
 828         /* make sure receives are disabled while setting up the descriptors */
 829
 830         rctl = IXGB_READ_REG(hw, RCTL);
 831         IXGB_WRITE_REG(hw, RCTL, rctl & ~IXGB_RCTL_RXEN);
 832
 833         /* set the Receive Delay Timer Register */
 834
 835         IXGB_WRITE_REG(hw, RDTR, adapter->rx_int_delay);
 836
 837         /* Setup the Base and Length of the Rx Descriptor Ring */
 838
 839         IXGB_WRITE_REG(hw, RDBAL, (rdba & 0x00000000ffffffffULL));
 840         IXGB_WRITE_REG(hw, RDBAH, (rdba >> 32));
 841
 842         IXGB_WRITE_REG(hw, RDLEN, rdlen);
 843
 844         /* Setup the HW Rx Head and Tail Descriptor Pointers */
 845         IXGB_WRITE_REG(hw, RDH, 0);
 846         IXGB_WRITE_REG(hw, RDT, 0);
 847
 848         /* set up pre-fetching of receive buffers so we get some before we
 849          * run out (default hardware behavior is to run out before fetching
 850          * more).  This sets up to fetch if HTHRESH rx descriptors are avail
 851          * and the descriptors in hw cache are below PTHRESH.  This avoids
 852          * the hardware behavior of fetching <=512 descriptors in a single
 853          * burst that pre-empts all other activity, usually causing fifo
 854          * overflows. */
 855         /* use WTHRESH to burst write 16 descriptors or burst when RXT0 */
 856         rxdctl = RXDCTL_WTHRESH_DEFAULT << IXGB_RXDCTL_WTHRESH_SHIFT |
 857                  RXDCTL_HTHRESH_DEFAULT << IXGB_RXDCTL_HTHRESH_SHIFT |
 858                  RXDCTL_PTHRESH_DEFAULT << IXGB_RXDCTL_PTHRESH_SHIFT;
 859         IXGB_WRITE_REG(hw, RXDCTL, rxdctl);
 860
 861         /* Enable Receive Checksum Offload for TCP and UDP */
 862         if(adapter->rx_csum == TRUE) {
 863                 rxcsum = IXGB_READ_REG(hw, RXCSUM);
 864                 rxcsum |= IXGB_RXCSUM_TUOFL;
 865                 IXGB_WRITE_REG(hw, RXCSUM, rxcsum);
 866         }
 867
 868         /* Enable Receives */
 869
 870         IXGB_WRITE_REG(hw, RCTL, rctl);
 871 }
 872
 873 /**
 874  * ixgb_free_tx_resources - Free Tx Resources
 875  * @adapter: board private structure
 876  *
 877  * Free all transmit software resources
 878  **/
 879
 880 void
 881 ixgb_free_tx_resources(struct ixgb_adapter *adapter)
 882 {
 883         struct pci_dev *pdev = adapter->pdev;
 884
 885         ixgb_clean_tx_ring(adapter);
 886
 887         vfree(adapter->tx_ring.buffer_info);
 888         adapter->tx_ring.buffer_info = NULL;
 889
 890         pci_free_consistent(pdev, adapter->tx_ring.size,
 891                             adapter->tx_ring.desc, adapter->tx_ring.dma);
 892
 893         adapter->tx_ring.desc = NULL;
 894 }
 895
 896 static inline void
 897 ixgb_unmap_and_free_tx_resource(struct ixgb_adapter *adapter,
 898                                         struct ixgb_buffer *buffer_info)
 899 {
 900         struct pci_dev *pdev = adapter->pdev;
 901         if(buffer_info->dma) {
 902                 pci_unmap_page(pdev,
 903                            buffer_info->dma,
 904                            buffer_info->length,
 905                            PCI_DMA_TODEVICE);
 906                 buffer_info->dma = 0;
 907         }
 908         if(buffer_info->skb) {
 909                 dev_kfree_skb_any(buffer_info->skb);
 910                 buffer_info->skb = NULL;
 911         }
 912 }
 913
 914 /**
 915  * ixgb_clean_tx_ring - Free Tx Buffers
 916  * @adapter: board private structure
 917  **/
 918
 919 static void
 920 ixgb_clean_tx_ring(struct ixgb_adapter *adapter)
 921 {
 922         struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
 923         struct ixgb_buffer *buffer_info;
 924         unsigned long size;
 925         unsigned int i;
 926
 927         /* Free all the Tx ring sk_buffs */
 928
 929         for(i = 0; i < tx_ring->count; i++) {
 930                 buffer_info = &tx_ring->buffer_info[i];
 931                 ixgb_unmap_and_free_tx_resource(adapter, buffer_info);
 932         }
 933
 934         size = sizeof(struct ixgb_buffer) * tx_ring->count;
 935         memset(tx_ring->buffer_info, 0, size);
 936
 937         /* Zero out the descriptor ring */
 938
 939         memset(tx_ring->desc, 0, tx_ring->size);
 940
 941         tx_ring->next_to_use = 0;
 942         tx_ring->next_to_clean = 0;
 943
 944         IXGB_WRITE_REG(&adapter->hw, TDH, 0);
 945         IXGB_WRITE_REG(&adapter->hw, TDT, 0);
 946 }
 947
 948 /**
 949  * ixgb_free_rx_resources - Free Rx Resources
 950  * @adapter: board private structure
 951  *
 952  * Free all receive software resources
 953  **/
 954
 955 void
 956 ixgb_free_rx_resources(struct ixgb_adapter *adapter)
 957 {
 958         struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
 959         struct pci_dev *pdev = adapter->pdev;
 960
 961         ixgb_clean_rx_ring(adapter);
 962
 963         vfree(rx_ring->buffer_info);
 964         rx_ring->buffer_info = NULL;
 965
 966         pci_free_consistent(pdev, rx_ring->size, rx_ring->desc, rx_ring->dma);
 967
 968         rx_ring->desc = NULL;
 969 }
 970
 971 /**
 972  * ixgb_clean_rx_ring - Free Rx Buffers
 973  * @adapter: board private structure
 974  **/
 975
 976 static void
 977 ixgb_clean_rx_ring(struct ixgb_adapter *adapter)
 978 {
 979         struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
 980         struct ixgb_buffer *buffer_info;
 981         struct pci_dev *pdev = adapter->pdev;
 982         unsigned long size;
 983         unsigned int i;
 984
 985         /* Free all the Rx ring sk_buffs */
 986
 987         for(i = 0; i < rx_ring->count; i++) {
 988                 buffer_info = &rx_ring->buffer_info[i];
 989                 if(buffer_info->skb) {
 990
 991                         pci_unmap_single(pdev,
 992                                          buffer_info->dma,
 993                                          buffer_info->length,
 994                                          PCI_DMA_FROMDEVICE);
 995
 996                         dev_kfree_skb(buffer_info->skb);
 997
 998                         buffer_info->skb = NULL;
 999                 }
1000         }
1001
1002         size = sizeof(struct ixgb_buffer) * rx_ring->count;
1003         memset(rx_ring->buffer_info, 0, size);
1004
1005         /* Zero out the descriptor ring */
1006
1007         memset(rx_ring->desc, 0, rx_ring->size);
1008
1009         rx_ring->next_to_clean = 0;
1010         rx_ring->next_to_use = 0;
1011
1012         IXGB_WRITE_REG(&adapter->hw, RDH, 0);
1013         IXGB_WRITE_REG(&adapter->hw, RDT, 0);
1014 }
1015
1016 /**
1017  * ixgb_set_mac - Change the Ethernet Address of the NIC
1018  * @netdev: network interface device structure
1019  * @p: pointer to an address structure
1020  *
1021  * Returns 0 on success, negative on failure
1022  **/
1023
1024 static int
1025 ixgb_set_mac(struct net_device *netdev, void *p)
1026 {
1027         struct ixgb_adapter *adapter = netdev_priv(netdev);
1028         struct sockaddr *addr = p;
1029
1030         if(!is_valid_ether_addr(addr->sa_data))
1031                 return -EADDRNOTAVAIL;
1032
1033         memcpy(netdev->dev_addr, addr->sa_data, netdev->addr_len);
1034
1035         ixgb_rar_set(&adapter->hw, addr->sa_data, 0);
1036
1037         return 0;
1038 }
1039
1040 /**
1041  * ixgb_set_multi - Multicast and Promiscuous mode set
1042  * @netdev: network interface device structure
1043  *
1044  * The set_multi entry point is called whenever the multicast address
1045  * list or the network interface flags are updated.  This routine is
1046  * responsible for configuring the hardware for proper multicast,
1047  * promiscuous mode, and all-multi behavior.
1048  **/
1049
1050 static void
1051 ixgb_set_multi(struct net_device *netdev)
1052 {
1053         struct ixgb_adapter *adapter = netdev_priv(netdev);
1054         struct ixgb_hw *hw = &adapter->hw;
1055         struct dev_mc_list *mc_ptr;
1056         uint32_t rctl;
1057         int i;
1058
1059         /* Check for Promiscuous and All Multicast modes */
1060
1061         rctl = IXGB_READ_REG(hw, RCTL);
1062
1063         if(netdev->flags & IFF_PROMISC) {
1064                 rctl |= (IXGB_RCTL_UPE | IXGB_RCTL_MPE);
1065         } else if(netdev->flags & IFF_ALLMULTI) {
1066                 rctl |= IXGB_RCTL_MPE;
1067                 rctl &= ~IXGB_RCTL_UPE;
1068         } else {
1069                 rctl &= ~(IXGB_RCTL_UPE | IXGB_RCTL_MPE);
1070         }
1071
1072         if(netdev->mc_count > IXGB_MAX_NUM_MULTICAST_ADDRESSES) {
1073                 rctl |= IXGB_RCTL_MPE;
1074                 IXGB_WRITE_REG(hw, RCTL, rctl);
1075         } else {
1076                 uint8_t mta[netdev->mc_count * IXGB_ETH_LENGTH_OF_ADDRESS];
1077
1078                 IXGB_WRITE_REG(hw, RCTL, rctl);
1079
1080                 for(i = 0, mc_ptr = netdev->mc_list; mc_ptr;
1081                         i++, mc_ptr = mc_ptr->next)
1082                         memcpy(&mta[i * IXGB_ETH_LENGTH_OF_ADDRESS],
1083                                    mc_ptr->dmi_addr, IXGB_ETH_LENGTH_OF_ADDRESS);
1084
1085                 ixgb_mc_addr_list_update(hw, mta, netdev->mc_count, 0);
1086         }
1087 }
1088
1089 /**
1090  * ixgb_watchdog - Timer Call-back
1091  * @data: pointer to netdev cast into an unsigned long
1092  **/
1093
1094 static void
1095 ixgb_watchdog(unsigned long data)
1096 {
1097         struct ixgb_adapter *adapter = (struct ixgb_adapter *)data;
1098         struct net_device *netdev = adapter->netdev;
1099         struct ixgb_desc_ring *txdr = &adapter->tx_ring;
1100
1101         ixgb_check_for_link(&adapter->hw);
1102
1103         if (ixgb_check_for_bad_link(&adapter->hw)) {
1104                 /* force the reset path */
1105                 netif_stop_queue(netdev);
1106         }
1107
1108         if(adapter->hw.link_up) {
1109                 if(!netif_carrier_ok(netdev)) {
1110                         printk(KERN_INFO "ixgb: %s NIC Link is Up %d Mbps %s\n",
1111                                    netdev->name, 10000, "Full Duplex");
1112                         adapter->link_speed = 10000;
1113                         adapter->link_duplex = FULL_DUPLEX;
1114                         netif_carrier_on(netdev);
1115                         netif_wake_queue(netdev);
1116                 }
1117         } else {
1118                 if(netif_carrier_ok(netdev)) {
1119                         adapter->link_speed = 0;
1120                         adapter->link_duplex = 0;
1121                         printk(KERN_INFO
1122                                    "ixgb: %s NIC Link is Down\n",
1123                                    netdev->name);
1124                         netif_carrier_off(netdev);
1125                         netif_stop_queue(netdev);
1126
1127                 }
1128         }
1129
1130         ixgb_update_stats(adapter);
1131
1132         if(!netif_carrier_ok(netdev)) {
1133                 if(IXGB_DESC_UNUSED(txdr) + 1 < txdr->count) {
1134                         /* We've lost link, so the controller stops DMA,
1135                          * but we've got queued Tx work that's never going
1136                          * to get done, so reset controller to flush Tx.
1137                          * (Do the reset outside of interrupt context). */
1138                         schedule_work(&adapter->tx_timeout_task);
1139                 }
1140         }
1141
1142         /* Force detection of hung controller every watchdog period */
1143         adapter->detect_tx_hung = TRUE;
1144
1145         /* generate an interrupt to force clean up of any stragglers */
1146         IXGB_WRITE_REG(&adapter->hw, ICS, IXGB_INT_TXDW);
1147
1148         /* Reset the timer */
1149         mod_timer(&adapter->watchdog_timer, jiffies + 2 * HZ);
1150 }
1151
1152 #define IXGB_TX_FLAGS_CSUM              0x00000001
1153 #define IXGB_TX_FLAGS_VLAN              0x00000002
1154 #define IXGB_TX_FLAGS_TSO               0x00000004
1155
1156 static inline int
1157 ixgb_tso(struct ixgb_adapter *adapter, struct sk_buff *skb)
1158 {
1159 #ifdef NETIF_F_TSO
1160         struct ixgb_context_desc *context_desc;
1161         unsigned int i;
1162         uint8_t ipcss, ipcso, tucss, tucso, hdr_len;
1163         uint16_t ipcse, tucse, mss;
1164         int err;
1165
1166         if(likely(skb_shinfo(skb)->tso_size)) {
1167                 if (skb_header_cloned(skb)) {
1168                         err = pskb_expand_head(skb, 0, 0, GFP_ATOMIC);
1169                         if (err)
1170                                 return err;
1171                 }
1172
1173                 hdr_len = ((skb->h.raw - skb->data) + (skb->h.th->doff << 2));
1174                 mss = skb_shinfo(skb)->tso_size;
1175                 skb->nh.iph->tot_len = 0;
1176                 skb->nh.iph->check = 0;
1177                 skb->h.th->check = ~csum_tcpudp_magic(skb->nh.iph->saddr,
1178                                                       skb->nh.iph->daddr,
1179                                                       0, IPPROTO_TCP, 0);
1180                 ipcss = skb->nh.raw - skb->data;
1181                 ipcso = (void *)&(skb->nh.iph->check) - (void *)skb->data;
1182                 ipcse = skb->h.raw - skb->data - 1;
1183                 tucss = skb->h.raw - skb->data;
1184                 tucso = (void *)&(skb->h.th->check) - (void *)skb->data;
1185                 tucse = 0;
1186
1187                 i = adapter->tx_ring.next_to_use;
1188                 context_desc = IXGB_CONTEXT_DESC(adapter->tx_ring, i);
1189
1190                 context_desc->ipcss = ipcss;
1191                 context_desc->ipcso = ipcso;
1192                 context_desc->ipcse = cpu_to_le16(ipcse);
1193                 context_desc->tucss = tucss;
1194                 context_desc->tucso = tucso;
1195                 context_desc->tucse = cpu_to_le16(tucse);
1196                 context_desc->mss = cpu_to_le16(mss);
1197                 context_desc->hdr_len = hdr_len;
1198                 context_desc->status = 0;
1199                 context_desc->cmd_type_len = cpu_to_le32(
1200                                                   IXGB_CONTEXT_DESC_TYPE
1201                                                 | IXGB_CONTEXT_DESC_CMD_TSE
1202                                                 | IXGB_CONTEXT_DESC_CMD_IP
1203                                                 | IXGB_CONTEXT_DESC_CMD_TCP
1204                                                 | IXGB_CONTEXT_DESC_CMD_IDE
1205                                                 | (skb->len - (hdr_len)));
1206
1207
1208                 if(++i == adapter->tx_ring.count) i = 0;
1209                 adapter->tx_ring.next_to_use = i;
1210
1211                 return 1;
1212         }
1213 #endif
1214
1215         return 0;
1216 }
1217
1218 static inline boolean_t
1219 ixgb_tx_csum(struct ixgb_adapter *adapter, struct sk_buff *skb)
1220 {
1221         struct ixgb_context_desc *context_desc;
1222         unsigned int i;
1223         uint8_t css, cso;
1224
1225         if(likely(skb->ip_summed == CHECKSUM_HW)) {
1226                 css = skb->h.raw - skb->data;
1227                 cso = (skb->h.raw + skb->csum) - skb->data;
1228
1229                 i = adapter->tx_ring.next_to_use;
1230                 context_desc = IXGB_CONTEXT_DESC(adapter->tx_ring, i);
1231
1232                 context_desc->tucss = css;
1233                 context_desc->tucso = cso;
1234                 context_desc->tucse = 0;
1235                 /* zero out any previously existing data in one instruction */
1236                 *(uint32_t *)&(context_desc->ipcss) = 0;
1237                 context_desc->status = 0;
1238                 context_desc->hdr_len = 0;
1239                 context_desc->mss = 0;
1240                 context_desc->cmd_type_len =
1241                         cpu_to_le32(IXGB_CONTEXT_DESC_TYPE
1242                                     | IXGB_TX_DESC_CMD_IDE);
1243
1244                 if(++i == adapter->tx_ring.count) i = 0;
1245                 adapter->tx_ring.next_to_use = i;
1246
1247                 return TRUE;
1248         }
1249
1250         return FALSE;
1251 }
1252
1253 #define IXGB_MAX_TXD_PWR        14
1254 #define IXGB_MAX_DATA_PER_TXD   (1<<IXGB_MAX_TXD_PWR)
1255
1256 static inline int
1257 ixgb_tx_map(struct ixgb_adapter *adapter, struct sk_buff *skb,
1258             unsigned int first)
1259 {
1260         struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
1261         struct ixgb_buffer *buffer_info;
1262         int len = skb->len;
1263         unsigned int offset = 0, size, count = 0, i;
1264
1265         unsigned int nr_frags = skb_shinfo(skb)->nr_frags;
1266         unsigned int f;
1267
1268         len -= skb->data_len;
1269
1270         i = tx_ring->next_to_use;
1271
1272         while(len) {
1273                 buffer_info = &tx_ring->buffer_info[i];
1274                 size = min(len, IXGB_MAX_JUMBO_FRAME_SIZE);
1275                 buffer_info->length = size;
1276                 buffer_info->dma =
1277                         pci_map_single(adapter->pdev,
1278                                 skb->data + offset,
1279                                 size,
1280                                 PCI_DMA_TODEVICE);
1281                 buffer_info->time_stamp = jiffies;
1282
1283                 len -= size;
1284                 offset += size;
1285                 count++;
1286                 if(++i == tx_ring->count) i = 0;
1287         }
1288
1289         for(f = 0; f < nr_frags; f++) {
1290                 struct skb_frag_struct *frag;
1291
1292                 frag = &skb_shinfo(skb)->frags[f];
1293                 len = frag->size;
1294                 offset = 0;
1295
1296                 while(len) {
1297                         buffer_info = &tx_ring->buffer_info[i];
1298                         size = min(len, IXGB_MAX_JUMBO_FRAME_SIZE);
1299                         buffer_info->length = size;
1300                         buffer_info->dma =
1301                                 pci_map_page(adapter->pdev,
1302                                         frag->page,
1303                                         frag->page_offset + offset,
1304                                         size,
1305                                         PCI_DMA_TODEVICE);
1306                         buffer_info->time_stamp = jiffies;
1307
1308                         len -= size;
1309                         offset += size;
1310                         count++;
1311                         if(++i == tx_ring->count) i = 0;
1312                 }
1313         }
1314         i = (i == 0) ? tx_ring->count - 1 : i - 1;
1315         tx_ring->buffer_info[i].skb = skb;
1316         tx_ring->buffer_info[first].next_to_watch = i;
1317
1318         return count;
1319 }
1320
1321 static inline void
1322 ixgb_tx_queue(struct ixgb_adapter *adapter, int count, int vlan_id,int tx_flags)
1323 {
1324         struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
1325         struct ixgb_tx_desc *tx_desc = NULL;
1326         struct ixgb_buffer *buffer_info;
1327         uint32_t cmd_type_len = adapter->tx_cmd_type;
1328         uint8_t status = 0;
1329         uint8_t popts = 0;
1330         unsigned int i;
1331
1332         if(tx_flags & IXGB_TX_FLAGS_TSO) {
1333                 cmd_type_len |= IXGB_TX_DESC_CMD_TSE;
1334                 popts |= (IXGB_TX_DESC_POPTS_IXSM | IXGB_TX_DESC_POPTS_TXSM);
1335         }
1336
1337         if(tx_flags & IXGB_TX_FLAGS_CSUM)
1338                 popts |= IXGB_TX_DESC_POPTS_TXSM;
1339
1340         if(tx_flags & IXGB_TX_FLAGS_VLAN) {
1341                 cmd_type_len |= IXGB_TX_DESC_CMD_VLE;
1342         }
1343
1344         i = tx_ring->next_to_use;
1345
1346         while(count--) {
1347                 buffer_info = &tx_ring->buffer_info[i];
1348                 tx_desc = IXGB_TX_DESC(*tx_ring, i);
1349                 tx_desc->buff_addr = cpu_to_le64(buffer_info->dma);
1350                 tx_desc->cmd_type_len =
1351                         cpu_to_le32(cmd_type_len | buffer_info->length);
1352                 tx_desc->status = status;
1353                 tx_desc->popts = popts;
1354                 tx_desc->vlan = cpu_to_le16(vlan_id);
1355
1356                 if(++i == tx_ring->count) i = 0;
1357         }
1358
1359         tx_desc->cmd_type_len |= cpu_to_le32(IXGB_TX_DESC_CMD_EOP
1360                                 | IXGB_TX_DESC_CMD_RS );
1361
1362         /* Force memory writes to complete before letting h/w
1363          * know there are new descriptors to fetch.  (Only
1364          * applicable for weak-ordered memory model archs,
1365          * such as IA-64). */
1366         wmb();
1367
1368         tx_ring->next_to_use = i;
1369         IXGB_WRITE_REG(&adapter->hw, TDT, i);
1370 }
1371
1372 /* Tx Descriptors needed, worst case */
1373 #define TXD_USE_COUNT(S) (((S) >> IXGB_MAX_TXD_PWR) + \
1374                          (((S) & (IXGB_MAX_DATA_PER_TXD - 1)) ? 1 : 0))
1375 #define DESC_NEEDED TXD_USE_COUNT(IXGB_MAX_DATA_PER_TXD) + \
1376         MAX_SKB_FRAGS * TXD_USE_COUNT(PAGE_SIZE) + 1
1377
1378 static int
1379 ixgb_xmit_frame(struct sk_buff *skb, struct net_device *netdev)
1380 {
1381         struct ixgb_adapter *adapter = netdev_priv(netdev);
1382         unsigned int first;
1383         unsigned int tx_flags = 0;
1384         unsigned long flags;
1385         int vlan_id = 0;
1386         int tso;
1387
1388         if(skb->len <= 0) {
1389                 dev_kfree_skb_any(skb);
1390                 return 0;
1391         }
1392
1393         spin_lock_irqsave(&adapter->tx_lock, flags);
1394         if(unlikely(IXGB_DESC_UNUSED(&adapter->tx_ring) < DESC_NEEDED)) {
1395                 netif_stop_queue(netdev);
1396                 spin_unlock_irqrestore(&adapter->tx_lock, flags);
1397                 return 1;
1398         }
1399         spin_unlock_irqrestore(&adapter->tx_lock, flags);
1400
1401         if(adapter->vlgrp && vlan_tx_tag_present(skb)) {
1402                 tx_flags |= IXGB_TX_FLAGS_VLAN;
1403                 vlan_id = vlan_tx_tag_get(skb);
1404         }
1405
1406         first = adapter->tx_ring.next_to_use;
1407
1408         tso = ixgb_tso(adapter, skb);
1409         if (tso < 0) {
1410                 dev_kfree_skb_any(skb);
1411                 return NETDEV_TX_OK;
1412         }
1413
1414         if (tso)
1415                 tx_flags |= IXGB_TX_FLAGS_TSO;
1416         else if(ixgb_tx_csum(adapter, skb))
1417                 tx_flags |= IXGB_TX_FLAGS_CSUM;
1418
1419         ixgb_tx_queue(adapter, ixgb_tx_map(adapter, skb, first), vlan_id,
1420                         tx_flags);
1421
1422         netdev->trans_start = jiffies;
1423
1424         return 0;
1425 }
1426
1427 /**
1428  * ixgb_tx_timeout - Respond to a Tx Hang
1429  * @netdev: network interface device structure
1430  **/
1431
1432 static void
1433 ixgb_tx_timeout(struct net_device *netdev)
1434 {
1435         struct ixgb_adapter *adapter = netdev_priv(netdev);
1436
1437         /* Do the reset outside of interrupt context */
1438         schedule_work(&adapter->tx_timeout_task);
1439 }
1440
1441 static void
1442 ixgb_tx_timeout_task(struct net_device *netdev)
1443 {
1444         struct ixgb_adapter *adapter = netdev_priv(netdev);
1445
1446         ixgb_down(adapter, TRUE);
1447         ixgb_up(adapter);
1448 }
1449
1450 /**
1451  * ixgb_get_stats - Get System Network Statistics
1452  * @netdev: network interface device structure
1453  *
1454  * Returns the address of the device statistics structure.
1455  * The statistics are actually updated from the timer callback.
1456  **/
1457
1458 static struct net_device_stats *
1459 ixgb_get_stats(struct net_device *netdev)
1460 {
1461         struct ixgb_adapter *adapter = netdev_priv(netdev);
1462
1463         return &adapter->net_stats;
1464 }
1465
1466 /**
1467  * ixgb_change_mtu - Change the Maximum Transfer Unit
1468  * @netdev: network interface device structure
1469  * @new_mtu: new value for maximum frame size
1470  *
1471  * Returns 0 on success, negative on failure
1472  **/
1473
1474 static int
1475 ixgb_change_mtu(struct net_device *netdev, int new_mtu)
1476 {
1477         struct ixgb_adapter *adapter = netdev_priv(netdev);
1478         int max_frame = new_mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;
1479         int old_max_frame = netdev->mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;
1480
1481
1482         if((max_frame < IXGB_MIN_ENET_FRAME_SIZE_WITHOUT_FCS + ENET_FCS_LENGTH)
1483            || (max_frame > IXGB_MAX_JUMBO_FRAME_SIZE + ENET_FCS_LENGTH)) {
1484                 IXGB_ERR("Invalid MTU setting\n");
1485                 return -EINVAL;
1486         }
1487
1488         if((max_frame <= IXGB_MAX_ENET_FRAME_SIZE_WITHOUT_FCS + ENET_FCS_LENGTH)
1489            || (max_frame <= IXGB_RXBUFFER_2048)) {
1490                 adapter->rx_buffer_len = IXGB_RXBUFFER_2048;
1491
1492         } else if(max_frame <= IXGB_RXBUFFER_4096) {
1493                 adapter->rx_buffer_len = IXGB_RXBUFFER_4096;
1494
1495         } else if(max_frame <= IXGB_RXBUFFER_8192) {
1496                 adapter->rx_buffer_len = IXGB_RXBUFFER_8192;
1497
1498         } else {
1499                 adapter->rx_buffer_len = IXGB_RXBUFFER_16384;
1500         }
1501
1502         netdev->mtu = new_mtu;
1503
1504         if(old_max_frame != max_frame && netif_running(netdev)) {
1505
1506                 ixgb_down(adapter, TRUE);
1507                 ixgb_up(adapter);
1508         }
1509
1510         return 0;
1511 }
1512
1513 /**
1514  * ixgb_update_stats - Update the board statistics counters.
1515  * @adapter: board private structure
1516  **/
1517
1518 void
1519 ixgb_update_stats(struct ixgb_adapter *adapter)
1520 {
1521         struct net_device *netdev = adapter->netdev;
1522
1523         if((netdev->flags & IFF_PROMISC) || (netdev->flags & IFF_ALLMULTI) ||
1524            (netdev->mc_count > IXGB_MAX_NUM_MULTICAST_ADDRESSES)) {
1525                 u64 multi = IXGB_READ_REG(&adapter->hw, MPRCL);
1526                 u32 bcast_l = IXGB_READ_REG(&adapter->hw, BPRCL);
1527                 u32 bcast_h = IXGB_READ_REG(&adapter->hw, BPRCH);
1528                 u64 bcast = ((u64)bcast_h << 32) | bcast_l;
1529
1530                 multi |= ((u64)IXGB_READ_REG(&adapter->hw, MPRCH) << 32);
1531                 /* fix up multicast stats by removing broadcasts */
1532                 if(multi >= bcast)
1533                         multi -= bcast;
1534
1535                 adapter->stats.mprcl += (multi & 0xFFFFFFFF);
1536                 adapter->stats.mprch += (multi >> 32);
1537                 adapter->stats.bprcl += bcast_l;
1538                 adapter->stats.bprch += bcast_h;
1539         } else {
1540                 adapter->stats.mprcl += IXGB_READ_REG(&adapter->hw, MPRCL);
1541                 adapter->stats.mprch += IXGB_READ_REG(&adapter->hw, MPRCH);
1542                 adapter->stats.bprcl += IXGB_READ_REG(&adapter->hw, BPRCL);
1543                 adapter->stats.bprch += IXGB_READ_REG(&adapter->hw, BPRCH);
1544         }
1545         adapter->stats.tprl += IXGB_READ_REG(&adapter->hw, TPRL);
1546         adapter->stats.tprh += IXGB_READ_REG(&adapter->hw, TPRH);
1547         adapter->stats.gprcl += IXGB_READ_REG(&adapter->hw, GPRCL);
1548         adapter->stats.gprch += IXGB_READ_REG(&adapter->hw, GPRCH);
1549         adapter->stats.uprcl += IXGB_READ_REG(&adapter->hw, UPRCL);
1550         adapter->stats.uprch += IXGB_READ_REG(&adapter->hw, UPRCH);
1551         adapter->stats.vprcl += IXGB_READ_REG(&adapter->hw, VPRCL);
1552         adapter->stats.vprch += IXGB_READ_REG(&adapter->hw, VPRCH);
1553         adapter->stats.jprcl += IXGB_READ_REG(&adapter->hw, JPRCL);
1554         adapter->stats.jprch += IXGB_READ_REG(&adapter->hw, JPRCH);
1555         adapter->stats.gorcl += IXGB_READ_REG(&adapter->hw, GORCL);
1556         adapter->stats.gorch += IXGB_READ_REG(&adapter->hw, GORCH);
1557         adapter->stats.torl += IXGB_READ_REG(&adapter->hw, TORL);
1558         adapter->stats.torh += IXGB_READ_REG(&adapter->hw, TORH);
1559         adapter->stats.rnbc += IXGB_READ_REG(&adapter->hw, RNBC);
1560         adapter->stats.ruc += IXGB_READ_REG(&adapter->hw, RUC);
1561         adapter->stats.roc += IXGB_READ_REG(&adapter->hw, ROC);
1562         adapter->stats.rlec += IXGB_READ_REG(&adapter->hw, RLEC);
1563         adapter->stats.crcerrs += IXGB_READ_REG(&adapter->hw, CRCERRS);
1564         adapter->stats.icbc += IXGB_READ_REG(&adapter->hw, ICBC);
1565         adapter->stats.ecbc += IXGB_READ_REG(&adapter->hw, ECBC);
1566         adapter->stats.mpc += IXGB_READ_REG(&adapter->hw, MPC);
1567         adapter->stats.tptl += IXGB_READ_REG(&adapter->hw, TPTL);
1568         adapter->stats.tpth += IXGB_READ_REG(&adapter->hw, TPTH);
1569         adapter->stats.gptcl += IXGB_READ_REG(&adapter->hw, GPTCL);
1570         adapter->stats.gptch += IXGB_READ_REG(&adapter->hw, GPTCH);
1571         adapter->stats.bptcl += IXGB_READ_REG(&adapter->hw, BPTCL);
1572         adapter->stats.bptch += IXGB_READ_REG(&adapter->hw, BPTCH);
1573         adapter->stats.mptcl += IXGB_READ_REG(&adapter->hw, MPTCL);
1574         adapter->stats.mptch += IXGB_READ_REG(&adapter->hw, MPTCH);
1575         adapter->stats.uptcl += IXGB_READ_REG(&adapter->hw, UPTCL);
1576         adapter->stats.uptch += IXGB_READ_REG(&adapter->hw, UPTCH);
1577         adapter->stats.vptcl += IXGB_READ_REG(&adapter->hw, VPTCL);
1578         adapter->stats.vptch += IXGB_READ_REG(&adapter->hw, VPTCH);
1579         adapter->stats.jptcl += IXGB_READ_REG(&adapter->hw, JPTCL);
1580         adapter->stats.jptch += IXGB_READ_REG(&adapter->hw, JPTCH);
1581         adapter->stats.gotcl += IXGB_READ_REG(&adapter->hw, GOTCL);
1582         adapter->stats.gotch += IXGB_READ_REG(&adapter->hw, GOTCH);
1583         adapter->stats.totl += IXGB_READ_REG(&adapter->hw, TOTL);
1584         adapter->stats.toth += IXGB_READ_REG(&adapter->hw, TOTH);
1585         adapter->stats.dc += IXGB_READ_REG(&adapter->hw, DC);
1586         adapter->stats.plt64c += IXGB_READ_REG(&adapter->hw, PLT64C);
1587         adapter->stats.tsctc += IXGB_READ_REG(&adapter->hw, TSCTC);
1588         adapter->stats.tsctfc += IXGB_READ_REG(&adapter->hw, TSCTFC);
1589         adapter->stats.ibic += IXGB_READ_REG(&adapter->hw, IBIC);
1590         adapter->stats.rfc += IXGB_READ_REG(&adapter->hw, RFC);
1591         adapter->stats.lfc += IXGB_READ_REG(&adapter->hw, LFC);
1592         adapter->stats.pfrc += IXGB_READ_REG(&adapter->hw, PFRC);
1593         adapter->stats.pftc += IXGB_READ_REG(&adapter->hw, PFTC);
1594         adapter->stats.mcfrc += IXGB_READ_REG(&adapter->hw, MCFRC);
1595         adapter->stats.mcftc += IXGB_READ_REG(&adapter->hw, MCFTC);
1596         adapter->stats.xonrxc += IXGB_READ_REG(&adapter->hw, XONRXC);
1597         adapter->stats.xontxc += IXGB_READ_REG(&adapter->hw, XONTXC);
1598         adapter->stats.xoffrxc += IXGB_READ_REG(&adapter->hw, XOFFRXC);
1599         adapter->stats.xofftxc += IXGB_READ_REG(&adapter->hw, XOFFTXC);
1600         adapter->stats.rjc += IXGB_READ_REG(&adapter->hw, RJC);
1601
1602         /* Fill out the OS statistics structure */
1603
1604         adapter->net_stats.rx_packets = adapter->stats.gprcl;
1605         adapter->net_stats.tx_packets = adapter->stats.gptcl;
1606         adapter->net_stats.rx_bytes = adapter->stats.gorcl;
1607         adapter->net_stats.tx_bytes = adapter->stats.gotcl;
1608         adapter->net_stats.multicast = adapter->stats.mprcl;
1609         adapter->net_stats.collisions = 0;
1610
1611         /* ignore RLEC as it reports errors for padded (<64bytes) frames
1612          * with a length in the type/len field */
1613         adapter->net_stats.rx_errors =
1614             /* adapter->stats.rnbc + */ adapter->stats.crcerrs +
1615             adapter->stats.ruc +
1616             adapter->stats.roc /*+ adapter->stats.rlec */  +
1617             adapter->stats.icbc +
1618             adapter->stats.ecbc + adapter->stats.mpc;
1619
1620         /* see above
1621          * adapter->net_stats.rx_length_errors = adapter->stats.rlec;
1622          */
1623
1624         adapter->net_stats.rx_crc_errors = adapter->stats.crcerrs;
1625         adapter->net_stats.rx_fifo_errors = adapter->stats.mpc;
1626         adapter->net_stats.rx_missed_errors = adapter->stats.mpc;
1627         adapter->net_stats.rx_over_errors = adapter->stats.mpc;
1628
1629         adapter->net_stats.tx_errors = 0;
1630         adapter->net_stats.rx_frame_errors = 0;
1631         adapter->net_stats.tx_aborted_errors = 0;
1632         adapter->net_stats.tx_carrier_errors = 0;
1633         adapter->net_stats.tx_fifo_errors = 0;
1634         adapter->net_stats.tx_heartbeat_errors = 0;
1635         adapter->net_stats.tx_window_errors = 0;
1636 }
1637
1638 #define IXGB_MAX_INTR 10
1639 /**
1640  * ixgb_intr - Interrupt Handler
1641  * @irq: interrupt number
1642  * @data: pointer to a network interface device structure
1643  * @pt_regs: CPU registers structure
1644  **/
1645
1646 static irqreturn_t
1647 ixgb_intr(int irq, void *data, struct pt_regs *regs)
1648 {
1649         struct net_device *netdev = data;
1650         struct ixgb_adapter *adapter = netdev_priv(netdev);
1651         struct ixgb_hw *hw = &adapter->hw;
1652         uint32_t icr = IXGB_READ_REG(hw, ICR);
1653 #ifndef CONFIG_IXGB_NAPI
1654         unsigned int i;
1655 #endif
1656
1657         if(unlikely(!icr))
1658                 return IRQ_NONE;  /* Not our interrupt */
1659
1660         if(unlikely(icr & (IXGB_INT_RXSEQ | IXGB_INT_LSC))) {
1661                 mod_timer(&adapter->watchdog_timer, jiffies);
1662         }
1663
1664 #ifdef CONFIG_IXGB_NAPI
1665         if(netif_rx_schedule_prep(netdev)) {
1666
1667                 /* Disable interrupts and register for poll. The flush
1668                   of the posted write is intentionally left out.
1669                 */
1670
1671                 atomic_inc(&adapter->irq_sem);
1672                 IXGB_WRITE_REG(&adapter->hw, IMC, ~0);
1673                 __netif_rx_schedule(netdev);
1674         }
1675 #else
1676         /* yes, that is actually a & and it is meant to make sure that
1677          * every pass through this for loop checks both receive and
1678          * transmit queues for completed descriptors, intended to
1679          * avoid starvation issues and assist tx/rx fairness. */
1680         for(i = 0; i < IXGB_MAX_INTR; i++)
1681                 if(!ixgb_clean_rx_irq(adapter) &
1682                    !ixgb_clean_tx_irq(adapter))
1683                         break;
1684 #endif
1685         return IRQ_HANDLED;
1686 }
1687
1688 #ifdef CONFIG_IXGB_NAPI
1689 /**
1690  * ixgb_clean - NAPI Rx polling callback
1691  * @adapter: board private structure
1692  **/
1693
1694 static int
1695 ixgb_clean(struct net_device *netdev, int *budget)
1696 {
1697         struct ixgb_adapter *adapter = netdev_priv(netdev);
1698         int work_to_do = min(*budget, netdev->quota);
1699         int tx_cleaned;
1700         int work_done = 0;
1701
1702         tx_cleaned = ixgb_clean_tx_irq(adapter);
1703         ixgb_clean_rx_irq(adapter, &work_done, work_to_do);
1704
1705         *budget -= work_done;
1706         netdev->quota -= work_done;
1707
1708         /* if no Tx and not enough Rx work done, exit the polling mode */
1709         if((!tx_cleaned && (work_done == 0)) || !netif_running(netdev)) {
1710                 netif_rx_complete(netdev);
1711                 ixgb_irq_enable(adapter);
1712                 return 0;
1713         }
1714
1715         return 1;
1716 }
1717 #endif
1718
1719 /**
1720  * ixgb_clean_tx_irq - Reclaim resources after transmit completes
1721  * @adapter: board private structure
1722  **/
1723
1724 static boolean_t
1725 ixgb_clean_tx_irq(struct ixgb_adapter *adapter)
1726 {
1727         struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
1728         struct net_device *netdev = adapter->netdev;
1729         struct ixgb_tx_desc *tx_desc, *eop_desc;
1730         struct ixgb_buffer *buffer_info;
1731         unsigned int i, eop;
1732         boolean_t cleaned = FALSE;
1733
1734         i = tx_ring->next_to_clean;
1735         eop = tx_ring->buffer_info[i].next_to_watch;
1736         eop_desc = IXGB_TX_DESC(*tx_ring, eop);
1737
1738         while(eop_desc->status & IXGB_TX_DESC_STATUS_DD) {
1739
1740                 for(cleaned = FALSE; !cleaned; ) {
1741                         tx_desc = IXGB_TX_DESC(*tx_ring, i);
1742                         buffer_info = &tx_ring->buffer_info[i];
1743
1744                         if (tx_desc->popts
1745                             & (IXGB_TX_DESC_POPTS_TXSM |
1746                                IXGB_TX_DESC_POPTS_IXSM))
1747                                 adapter->hw_csum_tx_good++;
1748
1749                         ixgb_unmap_and_free_tx_resource(adapter, buffer_info);
1750
1751                         *(uint32_t *)&(tx_desc->status) = 0;
1752
1753                         cleaned = (i == eop);
1754                         if(++i == tx_ring->count) i = 0;
1755                 }
1756
1757                 eop = tx_ring->buffer_info[i].next_to_watch;
1758                 eop_desc = IXGB_TX_DESC(*tx_ring, eop);
1759         }
1760
1761         tx_ring->next_to_clean = i;
1762
1763         spin_lock(&adapter->tx_lock);
1764         if(cleaned && netif_queue_stopped(netdev) && netif_carrier_ok(netdev) &&
1765            (IXGB_DESC_UNUSED(tx_ring) > IXGB_TX_QUEUE_WAKE)) {
1766
1767                 netif_wake_queue(netdev);
1768         }
1769         spin_unlock(&adapter->tx_lock);
1770
1771         if(adapter->detect_tx_hung) {
1772                 /* detect a transmit hang in hardware, this serializes the
1773                  * check with the clearing of time_stamp and movement of i */
1774                 adapter->detect_tx_hung = FALSE;
1775                 if(tx_ring->buffer_info[i].dma &&
1776                    time_after(jiffies, tx_ring->buffer_info[i].time_stamp + HZ)
1777                    && !(IXGB_READ_REG(&adapter->hw, STATUS) &
1778                         IXGB_STATUS_TXOFF))
1779                         netif_stop_queue(netdev);
1780         }
1781
1782         return cleaned;
1783 }
1784
1785 /**
1786  * ixgb_rx_checksum - Receive Checksum Offload for 82597.
1787  * @adapter: board private structure
1788  * @rx_desc: receive descriptor
1789  * @sk_buff: socket buffer with received data
1790  **/
1791
1792 static inline void
1793 ixgb_rx_checksum(struct ixgb_adapter *adapter,
1794                  struct ixgb_rx_desc *rx_desc,
1795                  struct sk_buff *skb)
1796 {
1797         /* Ignore Checksum bit is set OR
1798          * TCP Checksum has not been calculated
1799          */
1800         if((rx_desc->status & IXGB_RX_DESC_STATUS_IXSM) ||
1801            (!(rx_desc->status & IXGB_RX_DESC_STATUS_TCPCS))) {
1802                 skb->ip_summed = CHECKSUM_NONE;
1803                 return;
1804         }
1805
1806         /* At this point we know the hardware did the TCP checksum */
1807         /* now look at the TCP checksum error bit */
1808         if(rx_desc->errors & IXGB_RX_DESC_ERRORS_TCPE) {
1809                 /* let the stack verify checksum errors */
1810                 skb->ip_summed = CHECKSUM_NONE;
1811                 adapter->hw_csum_rx_error++;
1812         } else {
1813                 /* TCP checksum is good */
1814                 skb->ip_summed = CHECKSUM_UNNECESSARY;
1815                 adapter->hw_csum_rx_good++;
1816         }
1817 }
1818
1819 /**
1820  * ixgb_clean_rx_irq - Send received data up the network stack,
1821  * @adapter: board private structure
1822  **/
1823
1824 static boolean_t
1825 #ifdef CONFIG_IXGB_NAPI
1826 ixgb_clean_rx_irq(struct ixgb_adapter *adapter, int *work_done, int work_to_do)
1827 #else
1828 ixgb_clean_rx_irq(struct ixgb_adapter *adapter)
1829 #endif
1830 {
1831         struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
1832         struct net_device *netdev = adapter->netdev;
1833         struct pci_dev *pdev = adapter->pdev;
1834         struct ixgb_rx_desc *rx_desc, *next_rxd;
1835         struct ixgb_buffer *buffer_info, *next_buffer, *next2_buffer;
1836         uint32_t length;
1837         unsigned int i, j;
1838         boolean_t cleaned = FALSE;
1839
1840         i = rx_ring->next_to_clean;
1841         rx_desc = IXGB_RX_DESC(*rx_ring, i);
1842         buffer_info = &rx_ring->buffer_info[i];
1843
1844         while(rx_desc->status & IXGB_RX_DESC_STATUS_DD) {
1845                 struct sk_buff *skb, *next_skb;
1846                 u8 status;
1847
1848 #ifdef CONFIG_IXGB_NAPI
1849                 if(*work_done >= work_to_do)
1850                         break;
1851
1852                 (*work_done)++;
1853 #endif
1854                 status = rx_desc->status;
1855                 skb = buffer_info->skb;
1856
1857                 prefetch(skb->data);
1858
1859                 if(++i == rx_ring->count) i = 0;
1860                 next_rxd = IXGB_RX_DESC(*rx_ring, i);
1861                 prefetch(next_rxd);
1862
1863                 if((j = i + 1) == rx_ring->count) j = 0;
1864                 next2_buffer = &rx_ring->buffer_info[j];
1865                 prefetch(next2_buffer);
1866
1867                 next_buffer = &rx_ring->buffer_info[i];
1868                 next_skb = next_buffer->skb;
1869                 prefetch(next_skb);
1870
1871                 cleaned = TRUE;
1872
1873                 pci_unmap_single(pdev,
1874                                  buffer_info->dma,
1875                                  buffer_info->length,
1876                                  PCI_DMA_FROMDEVICE);
1877
1878                 length = le16_to_cpu(rx_desc->length);
1879
1880                 if(unlikely(!(status & IXGB_RX_DESC_STATUS_EOP))) {
1881
1882                         /* All receives must fit into a single buffer */
1883
1884                         IXGB_DBG("Receive packet consumed multiple buffers "
1885                                          "length<%x>\n", length);
1886
1887                         dev_kfree_skb_irq(skb);
1888                         goto rxdesc_done;
1889                 }
1890
1891                 if (unlikely(rx_desc->errors
1892                              & (IXGB_RX_DESC_ERRORS_CE | IXGB_RX_DESC_ERRORS_SE
1893                                 | IXGB_RX_DESC_ERRORS_P |
1894                                 IXGB_RX_DESC_ERRORS_RXE))) {
1895
1896                         dev_kfree_skb_irq(skb);
1897                         goto rxdesc_done;
1898                 }
1899
1900                 /* Good Receive */
1901                 skb_put(skb, length);
1902
1903                 /* Receive Checksum Offload */
1904                 ixgb_rx_checksum(adapter, rx_desc, skb);
1905
1906                 skb->protocol = eth_type_trans(skb, netdev);
1907 #ifdef CONFIG_IXGB_NAPI
1908                 if(adapter->vlgrp && (status & IXGB_RX_DESC_STATUS_VP)) {
1909                         vlan_hwaccel_receive_skb(skb, adapter->vlgrp,
1910                                 le16_to_cpu(rx_desc->special) &
1911                                         IXGB_RX_DESC_SPECIAL_VLAN_MASK);
1912                 } else {
1913                         netif_receive_skb(skb);
1914                 }
1915 #else /* CONFIG_IXGB_NAPI */
1916                 if(adapter->vlgrp && (status & IXGB_RX_DESC_STATUS_VP)) {
1917                         vlan_hwaccel_rx(skb, adapter->vlgrp,
1918                                 le16_to_cpu(rx_desc->special) &
1919                                         IXGB_RX_DESC_SPECIAL_VLAN_MASK);
1920                 } else {
1921                         netif_rx(skb);
1922                 }
1923 #endif /* CONFIG_IXGB_NAPI */
1924                 netdev->last_rx = jiffies;
1925
1926 rxdesc_done:
1927                 /* clean up descriptor, might be written over by hw */
1928                 rx_desc->status = 0;
1929                 buffer_info->skb = NULL;
1930
1931                 /* use prefetched values */
1932                 rx_desc = next_rxd;
1933                 buffer_info = next_buffer;
1934         }
1935
1936         rx_ring->next_to_clean = i;
1937
1938         ixgb_alloc_rx_buffers(adapter);
1939
1940         return cleaned;
1941 }
1942
1943 /**
1944  * ixgb_alloc_rx_buffers - Replace used receive buffers
1945  * @adapter: address of board private structure
1946  **/
1947
1948 static void
1949 ixgb_alloc_rx_buffers(struct ixgb_adapter *adapter)
1950 {
1951         struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
1952         struct net_device *netdev = adapter->netdev;
1953         struct pci_dev *pdev = adapter->pdev;
1954         struct ixgb_rx_desc *rx_desc;
1955         struct ixgb_buffer *buffer_info;
1956         struct sk_buff *skb;
1957         unsigned int i;
1958         int num_group_tail_writes;
1959         long cleancount;
1960
1961         i = rx_ring->next_to_use;
1962         buffer_info = &rx_ring->buffer_info[i];
1963         cleancount = IXGB_DESC_UNUSED(rx_ring);
1964
1965         num_group_tail_writes = IXGB_RX_BUFFER_WRITE;
1966
1967         /* leave three descriptors unused */
1968         while(--cleancount > 2) {
1969                 rx_desc = IXGB_RX_DESC(*rx_ring, i);
1970
1971                 skb = dev_alloc_skb(adapter->rx_buffer_len + NET_IP_ALIGN);
1972
1973                 if(unlikely(!skb)) {
1974                         /* Better luck next round */
1975                         break;
1976                 }
1977
1978                 /* Make buffer alignment 2 beyond a 16 byte boundary
1979                  * this will result in a 16 byte aligned IP header after
1980                  * the 14 byte MAC header is removed
1981                  */
1982                 skb_reserve(skb, NET_IP_ALIGN);
1983
1984                 skb->dev = netdev;
1985
1986                 buffer_info->skb = skb;
1987                 buffer_info->length = adapter->rx_buffer_len;
1988                 buffer_info->dma =
1989                         pci_map_single(pdev,
1990                                    skb->data,
1991                                    adapter->rx_buffer_len,
1992                                    PCI_DMA_FROMDEVICE);
1993
1994                 rx_desc->buff_addr = cpu_to_le64(buffer_info->dma);
1995                 /* guarantee DD bit not set now before h/w gets descriptor
1996                  * this is the rest of the workaround for h/w double
1997                  * writeback. */
1998                 rx_desc->status = 0;
1999
2000                 if((i & ~(num_group_tail_writes- 1)) == i) {
2001                         /* Force memory writes to complete before letting h/w
2002                          * know there are new descriptors to fetch.  (Only
2003                          * applicable for weak-ordered memory model archs,
2004                          * such as IA-64). */
2005                         wmb();
2006
2007                         IXGB_WRITE_REG(&adapter->hw, RDT, i);
2008                 }
2009
2010                 if(++i == rx_ring->count) i = 0;
2011                 buffer_info = &rx_ring->buffer_info[i];
2012         }
2013
2014         rx_ring->next_to_use = i;
2015 }
2016
2017 /**
2018  * ixgb_vlan_rx_register - enables or disables vlan tagging/stripping.
2019  *
2020  * @param netdev network interface device structure
2021  * @param grp indicates to enable or disable tagging/stripping
2022  **/
2023 static void
2024 ixgb_vlan_rx_register(struct net_device *netdev, struct vlan_group *grp)
2025 {
2026         struct ixgb_adapter *adapter = netdev_priv(netdev);
2027         uint32_t ctrl, rctl;
2028
2029         ixgb_irq_disable(adapter);
2030         adapter->vlgrp = grp;
2031
2032         if(grp) {
2033                 /* enable VLAN tag insert/strip */
2034                 ctrl = IXGB_READ_REG(&adapter->hw, CTRL0);
2035                 ctrl |= IXGB_CTRL0_VME;
2036                 IXGB_WRITE_REG(&adapter->hw, CTRL0, ctrl);
2037
2038                 /* enable VLAN receive filtering */
2039
2040                 rctl = IXGB_READ_REG(&adapter->hw, RCTL);
2041                 rctl |= IXGB_RCTL_VFE;
2042                 rctl &= ~IXGB_RCTL_CFIEN;
2043                 IXGB_WRITE_REG(&adapter->hw, RCTL, rctl);
2044         } else {
2045                 /* disable VLAN tag insert/strip */
2046
2047                 ctrl = IXGB_READ_REG(&adapter->hw, CTRL0);
2048                 ctrl &= ~IXGB_CTRL0_VME;
2049                 IXGB_WRITE_REG(&adapter->hw, CTRL0, ctrl);
2050
2051                 /* disable VLAN filtering */
2052
2053                 rctl = IXGB_READ_REG(&adapter->hw, RCTL);
2054                 rctl &= ~IXGB_RCTL_VFE;
2055                 IXGB_WRITE_REG(&adapter->hw, RCTL, rctl);
2056         }
2057
2058         ixgb_irq_enable(adapter);
2059 }
2060
2061 static void
2062 ixgb_vlan_rx_add_vid(struct net_device *netdev, uint16_t vid)
2063 {
2064         struct ixgb_adapter *adapter = netdev_priv(netdev);
2065         uint32_t vfta, index;
2066
2067         /* add VID to filter table */
2068
2069         index = (vid >> 5) & 0x7F;
2070         vfta = IXGB_READ_REG_ARRAY(&adapter->hw, VFTA, index);
2071         vfta |= (1 << (vid & 0x1F));
2072         ixgb_write_vfta(&adapter->hw, index, vfta);
2073 }
2074
2075 static void
2076 ixgb_vlan_rx_kill_vid(struct net_device *netdev, uint16_t vid)
2077 {
2078         struct ixgb_adapter *adapter = netdev_priv(netdev);
2079         uint32_t vfta, index;
2080
2081         ixgb_irq_disable(adapter);
2082
2083         if(adapter->vlgrp)
2084                 adapter->vlgrp->vlan_devices[vid] = NULL;
2085
2086         ixgb_irq_enable(adapter);
2087
2088         /* remove VID from filter table*/
2089
2090         index = (vid >> 5) & 0x7F;
2091         vfta = IXGB_READ_REG_ARRAY(&adapter->hw, VFTA, index);
2092         vfta &= ~(1 << (vid & 0x1F));
2093         ixgb_write_vfta(&adapter->hw, index, vfta);
2094 }
2095
2096 static void
2097 ixgb_restore_vlan(struct ixgb_adapter *adapter)
2098 {
2099         ixgb_vlan_rx_register(adapter->netdev, adapter->vlgrp);
2100
2101         if(adapter->vlgrp) {
2102                 uint16_t vid;
2103                 for(vid = 0; vid < VLAN_GROUP_ARRAY_LEN; vid++) {
2104                         if(!adapter->vlgrp->vlan_devices[vid])
2105                                 continue;
2106                         ixgb_vlan_rx_add_vid(adapter->netdev, vid);
2107                 }
2108         }
2109 }
2110
2111 #ifdef CONFIG_NET_POLL_CONTROLLER
2112 /*
2113  * Polling 'interrupt' - used by things like netconsole to send skbs
2114  * without having to re-enable interrupts. It's not called while
2115  * the interrupt routine is executing.
2116  */
2117
2118 static void ixgb_netpoll(struct net_device *dev)
2119 {
2120         struct ixgb_adapter *adapter = dev->priv;
2121
2122         disable_irq(adapter->pdev->irq);
2123         ixgb_intr(adapter->pdev->irq, dev, NULL);
2124         enable_irq(adapter->pdev->irq);
2125 }
2126 #endif
2127
2128 /* ixgb_main.c */