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

   1 /*******************************************************************************
   2
   3   Intel PRO/10GbE Linux driver
   4   Copyright(c) 1999 - 2008 Intel Corporation.
   5
   6   This program is free software; you can redistribute it and/or modify it
   7   under the terms and conditions of the GNU General Public License,
   8   version 2, as published by the Free Software Foundation.
   9
  10   This program is distributed in the hope it will be useful, but WITHOUT
  11   ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  12   FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  13   more details.
  14
  15   You should have received a copy of the GNU General Public License along with
  16   this program; if not, write to the Free Software Foundation, Inc.,
  17   51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
  18
  19   The full GNU General Public License is included in this distribution in
  20   the file called "COPYING".
  21
  22   Contact Information:
  23   Linux NICS <linux.nics@intel.com>
  24   e1000-devel Mailing List <e1000-devel@lists.sourceforge.net>
  25   Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
  26
  27 *******************************************************************************/
  28
  29 #include "ixgb.h"
  30
  31 char ixgb_driver_name[] = "ixgb";
  32 static char ixgb_driver_string[] = "Intel(R) PRO/10GbE Network Driver";
  33
  34 #define DRIVERNAPI "-NAPI"
  35 #define DRV_VERSION "1.0.135-k2" DRIVERNAPI
  36 const char ixgb_driver_version[] = DRV_VERSION;
  37 static const char ixgb_copyright[] = "Copyright (c) 1999-2008 Intel Corporation.";
  38
  39 #define IXGB_CB_LENGTH 256
  40 static unsigned int copybreak __read_mostly = IXGB_CB_LENGTH;
  41 module_param(copybreak, uint, 0644);
  42 MODULE_PARM_DESC(copybreak,
  43         "Maximum size of packet that is copied to a new buffer on receive");
  44
  45 /* ixgb_pci_tbl - PCI Device ID Table
  46  *
  47  * Wildcard entries (PCI_ANY_ID) should come last
  48  * Last entry must be all 0s
  49  *
  50  * { Vendor ID, Device ID, SubVendor ID, SubDevice ID,
  51  *   Class, Class Mask, private data (not used) }
  52  */
  53 static struct pci_device_id ixgb_pci_tbl[] = {
  54         {INTEL_VENDOR_ID, IXGB_DEVICE_ID_82597EX,
  55          PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
  56         {INTEL_VENDOR_ID, IXGB_DEVICE_ID_82597EX_CX4,
  57          PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
  58         {INTEL_VENDOR_ID, IXGB_DEVICE_ID_82597EX_SR,
  59          PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
  60         {INTEL_VENDOR_ID, IXGB_DEVICE_ID_82597EX_LR,
  61          PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
  62
  63         /* required last entry */
  64         {0,}
  65 };
  66
  67 MODULE_DEVICE_TABLE(pci, ixgb_pci_tbl);
  68
  69 /* Local Function Prototypes */
  70 static int ixgb_init_module(void);
  71 static void ixgb_exit_module(void);
  72 static int ixgb_probe(struct pci_dev *pdev, const struct pci_device_id *ent);
  73 static void __devexit ixgb_remove(struct pci_dev *pdev);
  74 static int ixgb_sw_init(struct ixgb_adapter *adapter);
  75 static int ixgb_open(struct net_device *netdev);
  76 static int ixgb_close(struct net_device *netdev);
  77 static void ixgb_configure_tx(struct ixgb_adapter *adapter);
  78 static void ixgb_configure_rx(struct ixgb_adapter *adapter);
  79 static void ixgb_setup_rctl(struct ixgb_adapter *adapter);
  80 static void ixgb_clean_tx_ring(struct ixgb_adapter *adapter);
  81 static void ixgb_clean_rx_ring(struct ixgb_adapter *adapter);
  82 static void ixgb_set_multi(struct net_device *netdev);
  83 static void ixgb_watchdog(unsigned long data);
  84 static int ixgb_xmit_frame(struct sk_buff *skb, struct net_device *netdev);
  85 static struct net_device_stats *ixgb_get_stats(struct net_device *netdev);
  86 static int ixgb_change_mtu(struct net_device *netdev, int new_mtu);
  87 static int ixgb_set_mac(struct net_device *netdev, void *p);
  88 static irqreturn_t ixgb_intr(int irq, void *data);
  89 static bool ixgb_clean_tx_irq(struct ixgb_adapter *adapter);
  90
  91 static int ixgb_clean(struct napi_struct *, int);
  92 static bool ixgb_clean_rx_irq(struct ixgb_adapter *, int *, int);
  93 static void ixgb_alloc_rx_buffers(struct ixgb_adapter *, int);
  94
  95 static void ixgb_tx_timeout(struct net_device *dev);
  96 static void ixgb_tx_timeout_task(struct work_struct *work);
  97
  98 static void ixgb_vlan_rx_register(struct net_device *netdev,
  99                                   struct vlan_group *grp);
 100 static void ixgb_vlan_rx_add_vid(struct net_device *netdev, u16 vid);
 101 static void ixgb_vlan_rx_kill_vid(struct net_device *netdev, u16 vid);
 102 static void ixgb_restore_vlan(struct ixgb_adapter *adapter);
 103
 104 #ifdef CONFIG_NET_POLL_CONTROLLER
 105 /* for netdump / net console */
 106 static void ixgb_netpoll(struct net_device *dev);
 107 #endif
 108
 109 static pci_ers_result_t ixgb_io_error_detected (struct pci_dev *pdev,
 110                              enum pci_channel_state state);
 111 static pci_ers_result_t ixgb_io_slot_reset (struct pci_dev *pdev);
 112 static void ixgb_io_resume (struct pci_dev *pdev);
 113
 114 static struct pci_error_handlers ixgb_err_handler = {
 115         .error_detected = ixgb_io_error_detected,
 116         .slot_reset = ixgb_io_slot_reset,
 117         .resume = ixgb_io_resume,
 118 };
 119
 120 static struct pci_driver ixgb_driver = {
 121         .name     = ixgb_driver_name,
 122         .id_table = ixgb_pci_tbl,
 123         .probe    = ixgb_probe,
 124         .remove   = __devexit_p(ixgb_remove),
 125         .err_handler = &ixgb_err_handler
 126 };
 127
 128 MODULE_AUTHOR("Intel Corporation, <linux.nics@intel.com>");
 129 MODULE_DESCRIPTION("Intel(R) PRO/10GbE Network Driver");
 130 MODULE_LICENSE("GPL");
 131 MODULE_VERSION(DRV_VERSION);
 132
 133 #define DEFAULT_DEBUG_LEVEL_SHIFT 3
 134 static int debug = DEFAULT_DEBUG_LEVEL_SHIFT;
 135 module_param(debug, int, 0);
 136 MODULE_PARM_DESC(debug, "Debug level (0=none,...,16=all)");
 137
 138 /**
 139  * ixgb_init_module - Driver Registration Routine
 140  *
 141  * ixgb_init_module is the first routine called when the driver is
 142  * loaded. All it does is register with the PCI subsystem.
 143  **/
 144
 145 static int __init
 146 ixgb_init_module(void)
 147 {
 148         printk(KERN_INFO "%s - version %s\n",
 149                ixgb_driver_string, ixgb_driver_version);
 150
 151         printk(KERN_INFO "%s\n", ixgb_copyright);
 152
 153         return pci_register_driver(&ixgb_driver);
 154 }
 155
 156 module_init(ixgb_init_module);
 157
 158 /**
 159  * ixgb_exit_module - Driver Exit Cleanup Routine
 160  *
 161  * ixgb_exit_module is called just before the driver is removed
 162  * from memory.
 163  **/
 164
 165 static void __exit
 166 ixgb_exit_module(void)
 167 {
 168         pci_unregister_driver(&ixgb_driver);
 169 }
 170
 171 module_exit(ixgb_exit_module);
 172
 173 /**
 174  * ixgb_irq_disable - Mask off interrupt generation on the NIC
 175  * @adapter: board private structure
 176  **/
 177
 178 static void
 179 ixgb_irq_disable(struct ixgb_adapter *adapter)
 180 {
 181         IXGB_WRITE_REG(&adapter->hw, IMC, ~0);
 182         IXGB_WRITE_FLUSH(&adapter->hw);
 183         synchronize_irq(adapter->pdev->irq);
 184 }
 185
 186 /**
 187  * ixgb_irq_enable - Enable default interrupt generation settings
 188  * @adapter: board private structure
 189  **/
 190
 191 static void
 192 ixgb_irq_enable(struct ixgb_adapter *adapter)
 193 {
 194         u32 val = IXGB_INT_RXT0 | IXGB_INT_RXDMT0 |
 195                   IXGB_INT_TXDW | IXGB_INT_LSC;
 196         if (adapter->hw.subsystem_vendor_id == SUN_SUBVENDOR_ID)
 197                 val |= IXGB_INT_GPI0;
 198         IXGB_WRITE_REG(&adapter->hw, IMS, val);
 199         IXGB_WRITE_FLUSH(&adapter->hw);
 200 }
 201
 202 int
 203 ixgb_up(struct ixgb_adapter *adapter)
 204 {
 205         struct net_device *netdev = adapter->netdev;
 206         int err, irq_flags = IRQF_SHARED;
 207         int max_frame = netdev->mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;
 208         struct ixgb_hw *hw = &adapter->hw;
 209
 210         /* hardware has been reset, we need to reload some things */
 211
 212         ixgb_rar_set(hw, netdev->dev_addr, 0);
 213         ixgb_set_multi(netdev);
 214
 215         ixgb_restore_vlan(adapter);
 216
 217         ixgb_configure_tx(adapter);
 218         ixgb_setup_rctl(adapter);
 219         ixgb_configure_rx(adapter);
 220         ixgb_alloc_rx_buffers(adapter, IXGB_DESC_UNUSED(&adapter->rx_ring));
 221
 222         /* disable interrupts and get the hardware into a known state */
 223         IXGB_WRITE_REG(&adapter->hw, IMC, 0xffffffff);
 224
 225         /* only enable MSI if bus is in PCI-X mode */
 226         if (IXGB_READ_REG(&adapter->hw, STATUS) & IXGB_STATUS_PCIX_MODE) {
 227                 err = pci_enable_msi(adapter->pdev);
 228                 if (!err) {
 229                         adapter->have_msi = 1;
 230                         irq_flags = 0;
 231                 }
 232                 /* proceed to try to request regular interrupt */
 233         }
 234
 235         err = request_irq(adapter->pdev->irq, &ixgb_intr, irq_flags,
 236                           netdev->name, netdev);
 237         if (err) {
 238                 if (adapter->have_msi)
 239                         pci_disable_msi(adapter->pdev);
 240                 DPRINTK(PROBE, ERR,
 241                  "Unable to allocate interrupt Error: %d\n", err);
 242                 return err;
 243         }
 244
 245         if ((hw->max_frame_size != max_frame) ||
 246                 (hw->max_frame_size !=
 247                 (IXGB_READ_REG(hw, MFS) >> IXGB_MFS_SHIFT))) {
 248
 249                 hw->max_frame_size = max_frame;
 250
 251                 IXGB_WRITE_REG(hw, MFS, hw->max_frame_size << IXGB_MFS_SHIFT);
 252
 253                 if (hw->max_frame_size >
 254                    IXGB_MAX_ENET_FRAME_SIZE_WITHOUT_FCS + ENET_FCS_LENGTH) {
 255                         u32 ctrl0 = IXGB_READ_REG(hw, CTRL0);
 256
 257                         if (!(ctrl0 & IXGB_CTRL0_JFE)) {
 258                                 ctrl0 |= IXGB_CTRL0_JFE;
 259                                 IXGB_WRITE_REG(hw, CTRL0, ctrl0);
 260                         }
 261                 }
 262         }
 263
 264         clear_bit(__IXGB_DOWN, &adapter->flags);
 265
 266         napi_enable(&adapter->napi);
 267         ixgb_irq_enable(adapter);
 268
 269         mod_timer(&adapter->watchdog_timer, jiffies);
 270
 271         return 0;
 272 }
 273
 274 void
 275 ixgb_down(struct ixgb_adapter *adapter, bool kill_watchdog)
 276 {
 277         struct net_device *netdev = adapter->netdev;
 278
 279         /* prevent the interrupt handler from restarting watchdog */
 280         set_bit(__IXGB_DOWN, &adapter->flags);
 281
 282         napi_disable(&adapter->napi);
 283         /* waiting for NAPI to complete can re-enable interrupts */
 284         ixgb_irq_disable(adapter);
 285         free_irq(adapter->pdev->irq, netdev);
 286
 287         if (adapter->have_msi)
 288                 pci_disable_msi(adapter->pdev);
 289
 290         if (kill_watchdog)
 291                 del_timer_sync(&adapter->watchdog_timer);
 292
 293         adapter->link_speed = 0;
 294         adapter->link_duplex = 0;
 295         netif_carrier_off(netdev);
 296         netif_stop_queue(netdev);
 297
 298         ixgb_reset(adapter);
 299         ixgb_clean_tx_ring(adapter);
 300         ixgb_clean_rx_ring(adapter);
 301 }
 302
 303 void
 304 ixgb_reset(struct ixgb_adapter *adapter)
 305 {
 306         struct ixgb_hw *hw = &adapter->hw;
 307
 308         ixgb_adapter_stop(hw);
 309         if (!ixgb_init_hw(hw))
 310                 DPRINTK(PROBE, ERR, "ixgb_init_hw failed.\n");
 311
 312         /* restore frame size information */
 313         IXGB_WRITE_REG(hw, MFS, hw->max_frame_size << IXGB_MFS_SHIFT);
 314         if (hw->max_frame_size >
 315             IXGB_MAX_ENET_FRAME_SIZE_WITHOUT_FCS + ENET_FCS_LENGTH) {
 316                 u32 ctrl0 = IXGB_READ_REG(hw, CTRL0);
 317                 if (!(ctrl0 & IXGB_CTRL0_JFE)) {
 318                         ctrl0 |= IXGB_CTRL0_JFE;
 319                         IXGB_WRITE_REG(hw, CTRL0, ctrl0);
 320                 }
 321         }
 322 }
 323
 324 /**
 325  * ixgb_probe - Device Initialization Routine
 326  * @pdev: PCI device information struct
 327  * @ent: entry in ixgb_pci_tbl
 328  *
 329  * Returns 0 on success, negative on failure
 330  *
 331  * ixgb_probe initializes an adapter identified by a pci_dev structure.
 332  * The OS initialization, configuring of the adapter private structure,
 333  * and a hardware reset occur.
 334  **/
 335
 336 static int __devinit
 337 ixgb_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
 338 {
 339         struct net_device *netdev = NULL;
 340         struct ixgb_adapter *adapter;
 341         static int cards_found = 0;
 342         int pci_using_dac;
 343         int i;
 344         int err;
 345
 346         err = pci_enable_device(pdev);
 347         if (err)
 348                 return err;
 349
 350         if (!(err = pci_set_dma_mask(pdev, DMA_64BIT_MASK)) &&
 351             !(err = pci_set_consistent_dma_mask(pdev, DMA_64BIT_MASK))) {
 352                 pci_using_dac = 1;
 353         } else {
 354                 if ((err = pci_set_dma_mask(pdev, DMA_32BIT_MASK)) ||
 355                     (err = pci_set_consistent_dma_mask(pdev, DMA_32BIT_MASK))) {
 356                         printk(KERN_ERR
 357                          "ixgb: No usable DMA configuration, aborting\n");
 358                         goto err_dma_mask;
 359                 }
 360                 pci_using_dac = 0;
 361         }
 362
 363         err = pci_request_regions(pdev, ixgb_driver_name);
 364         if (err)
 365                 goto err_request_regions;
 366
 367         pci_set_master(pdev);
 368
 369         netdev = alloc_etherdev(sizeof(struct ixgb_adapter));
 370         if (!netdev) {
 371                 err = -ENOMEM;
 372                 goto err_alloc_etherdev;
 373         }
 374
 375         SET_NETDEV_DEV(netdev, &pdev->dev);
 376
 377         pci_set_drvdata(pdev, netdev);
 378         adapter = netdev_priv(netdev);
 379         adapter->netdev = netdev;
 380         adapter->pdev = pdev;
 381         adapter->hw.back = adapter;
 382         adapter->msg_enable = netif_msg_init(debug, DEFAULT_DEBUG_LEVEL_SHIFT);
 383
 384         adapter->hw.hw_addr = ioremap(pci_resource_start(pdev, BAR_0),
 385                                       pci_resource_len(pdev, BAR_0));
 386         if (!adapter->hw.hw_addr) {
 387                 err = -EIO;
 388                 goto err_ioremap;
 389         }
 390
 391         for (i = BAR_1; i <= BAR_5; i++) {
 392                 if (pci_resource_len(pdev, i) == 0)
 393                         continue;
 394                 if (pci_resource_flags(pdev, i) & IORESOURCE_IO) {
 395                         adapter->hw.io_base = pci_resource_start(pdev, i);
 396                         break;
 397                 }
 398         }
 399
 400         netdev->open = &ixgb_open;
 401         netdev->stop = &ixgb_close;
 402         netdev->hard_start_xmit = &ixgb_xmit_frame;
 403         netdev->get_stats = &ixgb_get_stats;
 404         netdev->set_multicast_list = &ixgb_set_multi;
 405         netdev->set_mac_address = &ixgb_set_mac;
 406         netdev->change_mtu = &ixgb_change_mtu;
 407         ixgb_set_ethtool_ops(netdev);
 408         netdev->tx_timeout = &ixgb_tx_timeout;
 409         netdev->watchdog_timeo = 5 * HZ;
 410         netif_napi_add(netdev, &adapter->napi, ixgb_clean, 64);
 411         netdev->vlan_rx_register = ixgb_vlan_rx_register;
 412         netdev->vlan_rx_add_vid = ixgb_vlan_rx_add_vid;
 413         netdev->vlan_rx_kill_vid = ixgb_vlan_rx_kill_vid;
 414 #ifdef CONFIG_NET_POLL_CONTROLLER
 415         netdev->poll_controller = ixgb_netpoll;
 416 #endif
 417
 418         strncpy(netdev->name, pci_name(pdev), sizeof(netdev->name) - 1);
 419
 420         adapter->bd_number = cards_found;
 421         adapter->link_speed = 0;
 422         adapter->link_duplex = 0;
 423
 424         /* setup the private structure */
 425
 426         err = ixgb_sw_init(adapter);
 427         if (err)
 428                 goto err_sw_init;
 429
 430         netdev->features = NETIF_F_SG |
 431                            NETIF_F_HW_CSUM |
 432                            NETIF_F_HW_VLAN_TX |
 433                            NETIF_F_HW_VLAN_RX |
 434                            NETIF_F_HW_VLAN_FILTER;
 435         netdev->features |= NETIF_F_TSO;
 436
 437         if (pci_using_dac)
 438                 netdev->features |= NETIF_F_HIGHDMA;
 439
 440         /* make sure the EEPROM is good */
 441
 442         if (!ixgb_validate_eeprom_checksum(&adapter->hw)) {
 443                 DPRINTK(PROBE, ERR, "The EEPROM Checksum Is Not Valid\n");
 444                 err = -EIO;
 445                 goto err_eeprom;
 446         }
 447
 448         ixgb_get_ee_mac_addr(&adapter->hw, netdev->dev_addr);
 449         memcpy(netdev->perm_addr, netdev->dev_addr, netdev->addr_len);
 450
 451         if (!is_valid_ether_addr(netdev->perm_addr)) {
 452                 DPRINTK(PROBE, ERR, "Invalid MAC Address\n");
 453                 err = -EIO;
 454                 goto err_eeprom;
 455         }
 456
 457         adapter->part_num = ixgb_get_ee_pba_number(&adapter->hw);
 458
 459         init_timer(&adapter->watchdog_timer);
 460         adapter->watchdog_timer.function = &ixgb_watchdog;
 461         adapter->watchdog_timer.data = (unsigned long)adapter;
 462
 463         INIT_WORK(&adapter->tx_timeout_task, ixgb_tx_timeout_task);
 464
 465         strcpy(netdev->name, "eth%d");
 466         err = register_netdev(netdev);
 467         if (err)
 468                 goto err_register;
 469
 470         /* we're going to reset, so assume we have no link for now */
 471
 472         netif_carrier_off(netdev);
 473         netif_stop_queue(netdev);
 474
 475         DPRINTK(PROBE, INFO, "Intel(R) PRO/10GbE Network Connection\n");
 476         ixgb_check_options(adapter);
 477         /* reset the hardware with the new settings */
 478
 479         ixgb_reset(adapter);
 480
 481         cards_found++;
 482         return 0;
 483
 484 err_register:
 485 err_sw_init:
 486 err_eeprom:
 487         iounmap(adapter->hw.hw_addr);
 488 err_ioremap:
 489         free_netdev(netdev);
 490 err_alloc_etherdev:
 491         pci_release_regions(pdev);
 492 err_request_regions:
 493 err_dma_mask:
 494         pci_disable_device(pdev);
 495         return err;
 496 }
 497
 498 /**
 499  * ixgb_remove - Device Removal Routine
 500  * @pdev: PCI device information struct
 501  *
 502  * ixgb_remove is called by the PCI subsystem to alert the driver
 503  * that it should release a PCI device.  The could be caused by a
 504  * Hot-Plug event, or because the driver is going to be removed from
 505  * memory.
 506  **/
 507
 508 static void __devexit
 509 ixgb_remove(struct pci_dev *pdev)
 510 {
 511         struct net_device *netdev = pci_get_drvdata(pdev);
 512         struct ixgb_adapter *adapter = netdev_priv(netdev);
 513
 514         flush_scheduled_work();
 515
 516         unregister_netdev(netdev);
 517
 518         iounmap(adapter->hw.hw_addr);
 519         pci_release_regions(pdev);
 520
 521         free_netdev(netdev);
 522 }
 523
 524 /**
 525  * ixgb_sw_init - Initialize general software structures (struct ixgb_adapter)
 526  * @adapter: board private structure to initialize
 527  *
 528  * ixgb_sw_init initializes the Adapter private data structure.
 529  * Fields are initialized based on PCI device information and
 530  * OS network device settings (MTU size).
 531  **/
 532
 533 static int __devinit
 534 ixgb_sw_init(struct ixgb_adapter *adapter)
 535 {
 536         struct ixgb_hw *hw = &adapter->hw;
 537         struct net_device *netdev = adapter->netdev;
 538         struct pci_dev *pdev = adapter->pdev;
 539
 540         /* PCI config space info */
 541
 542         hw->vendor_id = pdev->vendor;
 543         hw->device_id = pdev->device;
 544         hw->subsystem_vendor_id = pdev->subsystem_vendor;
 545         hw->subsystem_id = pdev->subsystem_device;
 546
 547         hw->max_frame_size = netdev->mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;
 548         adapter->rx_buffer_len = hw->max_frame_size + 8; /* + 8 for errata */
 549
 550         if ((hw->device_id == IXGB_DEVICE_ID_82597EX)
 551            || (hw->device_id == IXGB_DEVICE_ID_82597EX_CX4)
 552            || (hw->device_id == IXGB_DEVICE_ID_82597EX_LR)
 553            || (hw->device_id == IXGB_DEVICE_ID_82597EX_SR))
 554                 hw->mac_type = ixgb_82597;
 555         else {
 556                 /* should never have loaded on this device */
 557                 DPRINTK(PROBE, ERR, "unsupported device id\n");
 558         }
 559
 560         /* enable flow control to be programmed */
 561         hw->fc.send_xon = 1;
 562
 563         set_bit(__IXGB_DOWN, &adapter->flags);
 564         return 0;
 565 }
 566
 567 /**
 568  * ixgb_open - Called when a network interface is made active
 569  * @netdev: network interface device structure
 570  *
 571  * Returns 0 on success, negative value on failure
 572  *
 573  * The open entry point is called when a network interface is made
 574  * active by the system (IFF_UP).  At this point all resources needed
 575  * for transmit and receive operations are allocated, the interrupt
 576  * handler is registered with the OS, the watchdog timer is started,
 577  * and the stack is notified that the interface is ready.
 578  **/
 579
 580 static int
 581 ixgb_open(struct net_device *netdev)
 582 {
 583         struct ixgb_adapter *adapter = netdev_priv(netdev);
 584         int err;
 585
 586         /* allocate transmit descriptors */
 587         err = ixgb_setup_tx_resources(adapter);
 588         if (err)
 589                 goto err_setup_tx;
 590
 591         /* allocate receive descriptors */
 592
 593         err = ixgb_setup_rx_resources(adapter);
 594         if (err)
 595                 goto err_setup_rx;
 596
 597         err = ixgb_up(adapter);
 598         if (err)
 599                 goto err_up;
 600
 601         return 0;
 602
 603 err_up:
 604         ixgb_free_rx_resources(adapter);
 605 err_setup_rx:
 606         ixgb_free_tx_resources(adapter);
 607 err_setup_tx:
 608         ixgb_reset(adapter);
 609
 610         return err;
 611 }
 612
 613 /**
 614  * ixgb_close - Disables a network interface
 615  * @netdev: network interface device structure
 616  *
 617  * Returns 0, this is not allowed to fail
 618  *
 619  * The close entry point is called when an interface is de-activated
 620  * by the OS.  The hardware is still under the drivers control, but
 621  * needs to be disabled.  A global MAC reset is issued to stop the
 622  * hardware, and all transmit and receive resources are freed.
 623  **/
 624
 625 static int
 626 ixgb_close(struct net_device *netdev)
 627 {
 628         struct ixgb_adapter *adapter = netdev_priv(netdev);
 629
 630         ixgb_down(adapter, true);
 631
 632         ixgb_free_tx_resources(adapter);
 633         ixgb_free_rx_resources(adapter);
 634
 635         return 0;
 636 }
 637
 638 /**
 639  * ixgb_setup_tx_resources - allocate Tx resources (Descriptors)
 640  * @adapter: board private structure
 641  *
 642  * Return 0 on success, negative on failure
 643  **/
 644
 645 int
 646 ixgb_setup_tx_resources(struct ixgb_adapter *adapter)
 647 {
 648         struct ixgb_desc_ring *txdr = &adapter->tx_ring;
 649         struct pci_dev *pdev = adapter->pdev;
 650         int size;
 651
 652         size = sizeof(struct ixgb_buffer) * txdr->count;
 653         txdr->buffer_info = vmalloc(size);
 654         if (!txdr->buffer_info) {
 655                 DPRINTK(PROBE, ERR,
 656                  "Unable to allocate transmit descriptor ring memory\n");
 657                 return -ENOMEM;
 658         }
 659         memset(txdr->buffer_info, 0, size);
 660
 661         /* round up to nearest 4K */
 662
 663         txdr->size = txdr->count * sizeof(struct ixgb_tx_desc);
 664         txdr->size = ALIGN(txdr->size, 4096);
 665
 666         txdr->desc = pci_alloc_consistent(pdev, txdr->size, &txdr->dma);
 667         if (!txdr->desc) {
 668                 vfree(txdr->buffer_info);
 669                 DPRINTK(PROBE, ERR,
 670                  "Unable to allocate transmit descriptor memory\n");
 671                 return -ENOMEM;
 672         }
 673         memset(txdr->desc, 0, txdr->size);
 674
 675         txdr->next_to_use = 0;
 676         txdr->next_to_clean = 0;
 677
 678         return 0;
 679 }
 680
 681 /**
 682  * ixgb_configure_tx - Configure 82597 Transmit Unit after Reset.
 683  * @adapter: board private structure
 684  *
 685  * Configure the Tx unit of the MAC after a reset.
 686  **/
 687
 688 static void
 689 ixgb_configure_tx(struct ixgb_adapter *adapter)
 690 {
 691         u64 tdba = adapter->tx_ring.dma;
 692         u32 tdlen = adapter->tx_ring.count * sizeof(struct ixgb_tx_desc);
 693         u32 tctl;
 694         struct ixgb_hw *hw = &adapter->hw;
 695
 696         /* Setup the Base and Length of the Tx Descriptor Ring
 697          * tx_ring.dma can be either a 32 or 64 bit value
 698          */
 699
 700         IXGB_WRITE_REG(hw, TDBAL, (tdba & 0x00000000ffffffffULL));
 701         IXGB_WRITE_REG(hw, TDBAH, (tdba >> 32));
 702
 703         IXGB_WRITE_REG(hw, TDLEN, tdlen);
 704
 705         /* Setup the HW Tx Head and Tail descriptor pointers */
 706
 707         IXGB_WRITE_REG(hw, TDH, 0);
 708         IXGB_WRITE_REG(hw, TDT, 0);
 709
 710         /* don't set up txdctl, it induces performance problems if configured
 711          * incorrectly */
 712         /* Set the Tx Interrupt Delay register */
 713
 714         IXGB_WRITE_REG(hw, TIDV, adapter->tx_int_delay);
 715
 716         /* Program the Transmit Control Register */
 717
 718         tctl = IXGB_TCTL_TCE | IXGB_TCTL_TXEN | IXGB_TCTL_TPDE;
 719         IXGB_WRITE_REG(hw, TCTL, tctl);
 720
 721         /* Setup Transmit Descriptor Settings for this adapter */
 722         adapter->tx_cmd_type =
 723                 IXGB_TX_DESC_TYPE |
 724                 (adapter->tx_int_delay_enable ? IXGB_TX_DESC_CMD_IDE : 0);
 725 }
 726
 727 /**
 728  * ixgb_setup_rx_resources - allocate Rx resources (Descriptors)
 729  * @adapter: board private structure
 730  *
 731  * Returns 0 on success, negative on failure
 732  **/
 733
 734 int
 735 ixgb_setup_rx_resources(struct ixgb_adapter *adapter)
 736 {
 737         struct ixgb_desc_ring *rxdr = &adapter->rx_ring;
 738         struct pci_dev *pdev = adapter->pdev;
 739         int size;
 740
 741         size = sizeof(struct ixgb_buffer) * rxdr->count;
 742         rxdr->buffer_info = vmalloc(size);
 743         if (!rxdr->buffer_info) {
 744                 DPRINTK(PROBE, ERR,
 745                  "Unable to allocate receive descriptor ring\n");
 746                 return -ENOMEM;
 747         }
 748         memset(rxdr->buffer_info, 0, size);
 749
 750         /* Round up to nearest 4K */
 751
 752         rxdr->size = rxdr->count * sizeof(struct ixgb_rx_desc);
 753         rxdr->size = ALIGN(rxdr->size, 4096);
 754
 755         rxdr->desc = pci_alloc_consistent(pdev, rxdr->size, &rxdr->dma);
 756
 757         if (!rxdr->desc) {
 758                 vfree(rxdr->buffer_info);
 759                 DPRINTK(PROBE, ERR,
 760                  "Unable to allocate receive descriptors\n");
 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         u32 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         if (adapter->rx_buffer_len <= IXGB_RXBUFFER_2048)
 793                 rctl |= IXGB_RCTL_BSIZE_2048;
 794         else if (adapter->rx_buffer_len <= IXGB_RXBUFFER_4096)
 795                 rctl |= IXGB_RCTL_BSIZE_4096;
 796         else if (adapter->rx_buffer_len <= IXGB_RXBUFFER_8192)
 797                 rctl |= IXGB_RCTL_BSIZE_8192;
 798         else if (adapter->rx_buffer_len <= IXGB_RXBUFFER_16384)
 799                 rctl |= IXGB_RCTL_BSIZE_16384;
 800
 801         IXGB_WRITE_REG(&adapter->hw, RCTL, rctl);
 802 }
 803
 804 /**
 805  * ixgb_configure_rx - Configure 82597 Receive Unit after Reset.
 806  * @adapter: board private structure
 807  *
 808  * Configure the Rx unit of the MAC after a reset.
 809  **/
 810
 811 static void
 812 ixgb_configure_rx(struct ixgb_adapter *adapter)
 813 {
 814         u64 rdba = adapter->rx_ring.dma;
 815         u32 rdlen = adapter->rx_ring.count * sizeof(struct ixgb_rx_desc);
 816         struct ixgb_hw *hw = &adapter->hw;
 817         u32 rctl;
 818         u32 rxcsum;
 819
 820         /* make sure receives are disabled while setting up the descriptors */
 821
 822         rctl = IXGB_READ_REG(hw, RCTL);
 823         IXGB_WRITE_REG(hw, RCTL, rctl & ~IXGB_RCTL_RXEN);
 824
 825         /* set the Receive Delay Timer Register */
 826
 827         IXGB_WRITE_REG(hw, RDTR, adapter->rx_int_delay);
 828
 829         /* Setup the Base and Length of the Rx Descriptor Ring */
 830
 831         IXGB_WRITE_REG(hw, RDBAL, (rdba & 0x00000000ffffffffULL));
 832         IXGB_WRITE_REG(hw, RDBAH, (rdba >> 32));
 833
 834         IXGB_WRITE_REG(hw, RDLEN, rdlen);
 835
 836         /* Setup the HW Rx Head and Tail Descriptor Pointers */
 837         IXGB_WRITE_REG(hw, RDH, 0);
 838         IXGB_WRITE_REG(hw, RDT, 0);
 839
 840         /* due to the hardware errata with RXDCTL, we are unable to use any of
 841          * the performance enhancing features of it without causing other
 842          * subtle bugs, some of the bugs could include receive length
 843          * corruption at high data rates (WTHRESH > 0) and/or receive
 844          * descriptor ring irregularites (particularly in hardware cache) */
 845         IXGB_WRITE_REG(hw, RXDCTL, 0);
 846
 847         /* Enable Receive Checksum Offload for TCP and UDP */
 848         if (adapter->rx_csum) {
 849                 rxcsum = IXGB_READ_REG(hw, RXCSUM);
 850                 rxcsum |= IXGB_RXCSUM_TUOFL;
 851                 IXGB_WRITE_REG(hw, RXCSUM, rxcsum);
 852         }
 853
 854         /* Enable Receives */
 855
 856         IXGB_WRITE_REG(hw, RCTL, rctl);
 857 }
 858
 859 /**
 860  * ixgb_free_tx_resources - Free Tx Resources
 861  * @adapter: board private structure
 862  *
 863  * Free all transmit software resources
 864  **/
 865
 866 void
 867 ixgb_free_tx_resources(struct ixgb_adapter *adapter)
 868 {
 869         struct pci_dev *pdev = adapter->pdev;
 870
 871         ixgb_clean_tx_ring(adapter);
 872
 873         vfree(adapter->tx_ring.buffer_info);
 874         adapter->tx_ring.buffer_info = NULL;
 875
 876         pci_free_consistent(pdev, adapter->tx_ring.size,
 877                             adapter->tx_ring.desc, adapter->tx_ring.dma);
 878
 879         adapter->tx_ring.desc = NULL;
 880 }
 881
 882 static void
 883 ixgb_unmap_and_free_tx_resource(struct ixgb_adapter *adapter,
 884                                 struct ixgb_buffer *buffer_info)
 885 {
 886         struct pci_dev *pdev = adapter->pdev;
 887
 888         if (buffer_info->dma)
 889                 pci_unmap_page(pdev, buffer_info->dma, buffer_info->length,
 890                                PCI_DMA_TODEVICE);
 891
 892         /* okay to call kfree_skb here instead of kfree_skb_any because
 893          * this is never called in interrupt context */
 894         if (buffer_info->skb)
 895                 dev_kfree_skb(buffer_info->skb);
 896
 897         buffer_info->skb = NULL;
 898         buffer_info->dma = 0;
 899         buffer_info->time_stamp = 0;
 900         /* these fields must always be initialized in tx
 901          * buffer_info->length = 0;
 902          * buffer_info->next_to_watch = 0; */
 903 }
 904
 905 /**
 906  * ixgb_clean_tx_ring - Free Tx Buffers
 907  * @adapter: board private structure
 908  **/
 909
 910 static void
 911 ixgb_clean_tx_ring(struct ixgb_adapter *adapter)
 912 {
 913         struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
 914         struct ixgb_buffer *buffer_info;
 915         unsigned long size;
 916         unsigned int i;
 917
 918         /* Free all the Tx ring sk_buffs */
 919
 920         for (i = 0; i < tx_ring->count; i++) {
 921                 buffer_info = &tx_ring->buffer_info[i];
 922                 ixgb_unmap_and_free_tx_resource(adapter, buffer_info);
 923         }
 924
 925         size = sizeof(struct ixgb_buffer) * tx_ring->count;
 926         memset(tx_ring->buffer_info, 0, size);
 927
 928         /* Zero out the descriptor ring */
 929
 930         memset(tx_ring->desc, 0, tx_ring->size);
 931
 932         tx_ring->next_to_use = 0;
 933         tx_ring->next_to_clean = 0;
 934
 935         IXGB_WRITE_REG(&adapter->hw, TDH, 0);
 936         IXGB_WRITE_REG(&adapter->hw, TDT, 0);
 937 }
 938
 939 /**
 940  * ixgb_free_rx_resources - Free Rx Resources
 941  * @adapter: board private structure
 942  *
 943  * Free all receive software resources
 944  **/
 945
 946 void
 947 ixgb_free_rx_resources(struct ixgb_adapter *adapter)
 948 {
 949         struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
 950         struct pci_dev *pdev = adapter->pdev;
 951
 952         ixgb_clean_rx_ring(adapter);
 953
 954         vfree(rx_ring->buffer_info);
 955         rx_ring->buffer_info = NULL;
 956
 957         pci_free_consistent(pdev, rx_ring->size, rx_ring->desc, rx_ring->dma);
 958
 959         rx_ring->desc = NULL;
 960 }
 961
 962 /**
 963  * ixgb_clean_rx_ring - Free Rx Buffers
 964  * @adapter: board private structure
 965  **/
 966
 967 static void
 968 ixgb_clean_rx_ring(struct ixgb_adapter *adapter)
 969 {
 970         struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
 971         struct ixgb_buffer *buffer_info;
 972         struct pci_dev *pdev = adapter->pdev;
 973         unsigned long size;
 974         unsigned int i;
 975
 976         /* Free all the Rx ring sk_buffs */
 977
 978         for (i = 0; i < rx_ring->count; i++) {
 979                 buffer_info = &rx_ring->buffer_info[i];
 980                 if (buffer_info->skb) {
 981
 982                         pci_unmap_single(pdev,
 983                                          buffer_info->dma,
 984                                          buffer_info->length,
 985                                          PCI_DMA_FROMDEVICE);
 986
 987                         dev_kfree_skb(buffer_info->skb);
 988
 989                         buffer_info->skb = NULL;
 990                 }
 991         }
 992
 993         size = sizeof(struct ixgb_buffer) * rx_ring->count;
 994         memset(rx_ring->buffer_info, 0, size);
 995
 996         /* Zero out the descriptor ring */
 997
 998         memset(rx_ring->desc, 0, rx_ring->size);
 999
1000         rx_ring->next_to_clean = 0;
1001         rx_ring->next_to_use = 0;
1002
1003         IXGB_WRITE_REG(&adapter->hw, RDH, 0);
1004         IXGB_WRITE_REG(&adapter->hw, RDT, 0);
1005 }
1006
1007 /**
1008  * ixgb_set_mac - Change the Ethernet Address of the NIC
1009  * @netdev: network interface device structure
1010  * @p: pointer to an address structure
1011  *
1012  * Returns 0 on success, negative on failure
1013  **/
1014
1015 static int
1016 ixgb_set_mac(struct net_device *netdev, void *p)
1017 {
1018         struct ixgb_adapter *adapter = netdev_priv(netdev);
1019         struct sockaddr *addr = p;
1020
1021         if (!is_valid_ether_addr(addr->sa_data))
1022                 return -EADDRNOTAVAIL;
1023
1024         memcpy(netdev->dev_addr, addr->sa_data, netdev->addr_len);
1025
1026         ixgb_rar_set(&adapter->hw, addr->sa_data, 0);
1027
1028         return 0;
1029 }
1030
1031 /**
1032  * ixgb_set_multi - Multicast and Promiscuous mode set
1033  * @netdev: network interface device structure
1034  *
1035  * The set_multi entry point is called whenever the multicast address
1036  * list or the network interface flags are updated.  This routine is
1037  * responsible for configuring the hardware for proper multicast,
1038  * promiscuous mode, and all-multi behavior.
1039  **/
1040
1041 static void
1042 ixgb_set_multi(struct net_device *netdev)
1043 {
1044         struct ixgb_adapter *adapter = netdev_priv(netdev);
1045         struct ixgb_hw *hw = &adapter->hw;
1046         struct dev_mc_list *mc_ptr;
1047         u32 rctl;
1048         int i;
1049
1050         /* Check for Promiscuous and All Multicast modes */
1051
1052         rctl = IXGB_READ_REG(hw, RCTL);
1053
1054         if (netdev->flags & IFF_PROMISC) {
1055                 rctl |= (IXGB_RCTL_UPE | IXGB_RCTL_MPE);
1056                 rctl &= ~IXGB_RCTL_VFE;
1057         } else {
1058                 if (netdev->flags & IFF_ALLMULTI) {
1059                         rctl |= IXGB_RCTL_MPE;
1060                         rctl &= ~IXGB_RCTL_UPE;
1061                 } else {
1062                         rctl &= ~(IXGB_RCTL_UPE | IXGB_RCTL_MPE);
1063                 }
1064                 rctl |= IXGB_RCTL_VFE;
1065         }
1066
1067         if (netdev->mc_count > IXGB_MAX_NUM_MULTICAST_ADDRESSES) {
1068                 rctl |= IXGB_RCTL_MPE;
1069                 IXGB_WRITE_REG(hw, RCTL, rctl);
1070         } else {
1071                 u8 mta[IXGB_MAX_NUM_MULTICAST_ADDRESSES *
1072                             IXGB_ETH_LENGTH_OF_ADDRESS];
1073
1074                 IXGB_WRITE_REG(hw, RCTL, rctl);
1075
1076                 for (i = 0, mc_ptr = netdev->mc_list;
1077                      mc_ptr;
1078                      i++, mc_ptr = mc_ptr->next)
1079                         memcpy(&mta[i * IXGB_ETH_LENGTH_OF_ADDRESS],
1080                                mc_ptr->dmi_addr, IXGB_ETH_LENGTH_OF_ADDRESS);
1081
1082                 ixgb_mc_addr_list_update(hw, mta, netdev->mc_count, 0);
1083         }
1084 }
1085
1086 /**
1087  * ixgb_watchdog - Timer Call-back
1088  * @data: pointer to netdev cast into an unsigned long
1089  **/
1090
1091 static void
1092 ixgb_watchdog(unsigned long data)
1093 {
1094         struct ixgb_adapter *adapter = (struct ixgb_adapter *)data;
1095         struct net_device *netdev = adapter->netdev;
1096         struct ixgb_desc_ring *txdr = &adapter->tx_ring;
1097
1098         ixgb_check_for_link(&adapter->hw);
1099
1100         if (ixgb_check_for_bad_link(&adapter->hw)) {
1101                 /* force the reset path */
1102                 netif_stop_queue(netdev);
1103         }
1104
1105         if (adapter->hw.link_up) {
1106                 if (!netif_carrier_ok(netdev)) {
1107                         DPRINTK(LINK, INFO,
1108                                 "NIC Link is Up 10000 Mbps Full Duplex\n");
1109                         adapter->link_speed = 10000;
1110                         adapter->link_duplex = FULL_DUPLEX;
1111                         netif_carrier_on(netdev);
1112                         netif_wake_queue(netdev);
1113                 }
1114         } else {
1115                 if (netif_carrier_ok(netdev)) {
1116                         adapter->link_speed = 0;
1117                         adapter->link_duplex = 0;
1118                         DPRINTK(LINK, INFO, "NIC Link is Down\n");
1119                         netif_carrier_off(netdev);
1120                         netif_stop_queue(netdev);
1121
1122                 }
1123         }
1124
1125         ixgb_update_stats(adapter);
1126
1127         if (!netif_carrier_ok(netdev)) {
1128                 if (IXGB_DESC_UNUSED(txdr) + 1 < txdr->count) {
1129                         /* We've lost link, so the controller stops DMA,
1130                          * but we've got queued Tx work that's never going
1131                          * to get done, so reset controller to flush Tx.
1132                          * (Do the reset outside of interrupt context). */
1133                         schedule_work(&adapter->tx_timeout_task);
1134                 }
1135         }
1136
1137         /* Force detection of hung controller every watchdog period */
1138         adapter->detect_tx_hung = true;
1139
1140         /* generate an interrupt to force clean up of any stragglers */
1141         IXGB_WRITE_REG(&adapter->hw, ICS, IXGB_INT_TXDW);
1142
1143         /* Reset the timer */
1144         mod_timer(&adapter->watchdog_timer, jiffies + 2 * HZ);
1145 }
1146
1147 #define IXGB_TX_FLAGS_CSUM              0x00000001
1148 #define IXGB_TX_FLAGS_VLAN              0x00000002
1149 #define IXGB_TX_FLAGS_TSO               0x00000004
1150
1151 static int
1152 ixgb_tso(struct ixgb_adapter *adapter, struct sk_buff *skb)
1153 {
1154         struct ixgb_context_desc *context_desc;
1155         unsigned int i;
1156         u8 ipcss, ipcso, tucss, tucso, hdr_len;
1157         u16 ipcse, tucse, mss;
1158         int err;
1159
1160         if (likely(skb_is_gso(skb))) {
1161                 struct ixgb_buffer *buffer_info;
1162                 struct iphdr *iph;
1163
1164                 if (skb_header_cloned(skb)) {
1165                         err = pskb_expand_head(skb, 0, 0, GFP_ATOMIC);
1166                         if (err)
1167                                 return err;
1168                 }
1169
1170                 hdr_len = skb_transport_offset(skb) + tcp_hdrlen(skb);
1171                 mss = skb_shinfo(skb)->gso_size;
1172                 iph = ip_hdr(skb);
1173                 iph->tot_len = 0;
1174                 iph->check = 0;
1175                 tcp_hdr(skb)->check = ~csum_tcpudp_magic(iph->saddr,
1176                                                          iph->daddr, 0,
1177                                                          IPPROTO_TCP, 0);
1178                 ipcss = skb_network_offset(skb);
1179                 ipcso = (void *)&(iph->check) - (void *)skb->data;
1180                 ipcse = skb_transport_offset(skb) - 1;
1181                 tucss = skb_transport_offset(skb);
1182                 tucso = (void *)&(tcp_hdr(skb)->check) - (void *)skb->data;
1183                 tucse = 0;
1184
1185                 i = adapter->tx_ring.next_to_use;
1186                 context_desc = IXGB_CONTEXT_DESC(adapter->tx_ring, i);
1187                 buffer_info = &adapter->tx_ring.buffer_info[i];
1188                 WARN_ON(buffer_info->dma != 0);
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
1214         return 0;
1215 }
1216
1217 static bool
1218 ixgb_tx_csum(struct ixgb_adapter *adapter, struct sk_buff *skb)
1219 {
1220         struct ixgb_context_desc *context_desc;
1221         unsigned int i;
1222         u8 css, cso;
1223
1224         if (likely(skb->ip_summed == CHECKSUM_PARTIAL)) {
1225                 struct ixgb_buffer *buffer_info;
1226                 css = skb_transport_offset(skb);
1227                 cso = css + skb->csum_offset;
1228
1229                 i = adapter->tx_ring.next_to_use;
1230                 context_desc = IXGB_CONTEXT_DESC(adapter->tx_ring, i);
1231                 buffer_info = &adapter->tx_ring.buffer_info[i];
1232                 WARN_ON(buffer_info->dma != 0);
1233
1234                 context_desc->tucss = css;
1235                 context_desc->tucso = cso;
1236                 context_desc->tucse = 0;
1237                 /* zero out any previously existing data in one instruction */
1238                 *(u32 *)&(context_desc->ipcss) = 0;
1239                 context_desc->status = 0;
1240                 context_desc->hdr_len = 0;
1241                 context_desc->mss = 0;
1242                 context_desc->cmd_type_len =
1243                         cpu_to_le32(IXGB_CONTEXT_DESC_TYPE
1244                                     | IXGB_TX_DESC_CMD_IDE);
1245
1246                 if (++i == adapter->tx_ring.count) i = 0;
1247                 adapter->tx_ring.next_to_use = i;
1248
1249                 return true;
1250         }
1251
1252         return false;
1253 }
1254
1255 #define IXGB_MAX_TXD_PWR        14
1256 #define IXGB_MAX_DATA_PER_TXD   (1<<IXGB_MAX_TXD_PWR)
1257
1258 static int
1259 ixgb_tx_map(struct ixgb_adapter *adapter, struct sk_buff *skb,
1260             unsigned int first)
1261 {
1262         struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
1263         struct ixgb_buffer *buffer_info;
1264         int len = skb->len;
1265         unsigned int offset = 0, size, count = 0, i;
1266         unsigned int mss = skb_shinfo(skb)->gso_size;
1267
1268         unsigned int nr_frags = skb_shinfo(skb)->nr_frags;
1269         unsigned int f;
1270
1271         len -= skb->data_len;
1272
1273         i = tx_ring->next_to_use;
1274
1275         while (len) {
1276                 buffer_info = &tx_ring->buffer_info[i];
1277                 size = min(len, IXGB_MAX_DATA_PER_TXD);
1278                 /* Workaround for premature desc write-backs
1279                  * in TSO mode.  Append 4-byte sentinel desc */
1280                 if (unlikely(mss && !nr_frags && size == len && size > 8))
1281                         size -= 4;
1282
1283                 buffer_info->length = size;
1284                 WARN_ON(buffer_info->dma != 0);
1285                 buffer_info->time_stamp = jiffies;
1286                 buffer_info->dma =
1287                         pci_map_single(adapter->pdev,
1288                                 skb->data + offset,
1289                                 size,
1290                                 PCI_DMA_TODEVICE);
1291                 buffer_info->next_to_watch = 0;
1292
1293                 len -= size;
1294                 offset += size;
1295                 count++;
1296                 if (++i == tx_ring->count) i = 0;
1297         }
1298
1299         for (f = 0; f < nr_frags; f++) {
1300                 struct skb_frag_struct *frag;
1301
1302                 frag = &skb_shinfo(skb)->frags[f];
1303                 len = frag->size;
1304                 offset = 0;
1305
1306                 while (len) {
1307                         buffer_info = &tx_ring->buffer_info[i];
1308                         size = min(len, IXGB_MAX_DATA_PER_TXD);
1309
1310                         /* Workaround for premature desc write-backs
1311                          * in TSO mode.  Append 4-byte sentinel desc */
1312                         if (unlikely(mss && (f == (nr_frags - 1))
1313                                      && size == len && size > 8))
1314                                 size -= 4;
1315
1316                         buffer_info->length = size;
1317                         buffer_info->time_stamp = jiffies;
1318                         buffer_info->dma =
1319                                 pci_map_page(adapter->pdev,
1320                                         frag->page,
1321                                         frag->page_offset + offset,
1322                                         size,
1323                                         PCI_DMA_TODEVICE);
1324                         buffer_info->next_to_watch = 0;
1325
1326                         len -= size;
1327                         offset += size;
1328                         count++;
1329                         if (++i == tx_ring->count) i = 0;
1330                 }
1331         }
1332         i = (i == 0) ? tx_ring->count - 1 : i - 1;
1333         tx_ring->buffer_info[i].skb = skb;
1334         tx_ring->buffer_info[first].next_to_watch = i;
1335
1336         return count;
1337 }
1338
1339 static void
1340 ixgb_tx_queue(struct ixgb_adapter *adapter, int count, int vlan_id,int tx_flags)
1341 {
1342         struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
1343         struct ixgb_tx_desc *tx_desc = NULL;
1344         struct ixgb_buffer *buffer_info;
1345         u32 cmd_type_len = adapter->tx_cmd_type;
1346         u8 status = 0;
1347         u8 popts = 0;
1348         unsigned int i;
1349
1350         if (tx_flags & IXGB_TX_FLAGS_TSO) {
1351                 cmd_type_len |= IXGB_TX_DESC_CMD_TSE;
1352                 popts |= (IXGB_TX_DESC_POPTS_IXSM | IXGB_TX_DESC_POPTS_TXSM);
1353         }
1354
1355         if (tx_flags & IXGB_TX_FLAGS_CSUM)
1356                 popts |= IXGB_TX_DESC_POPTS_TXSM;
1357
1358         if (tx_flags & IXGB_TX_FLAGS_VLAN)
1359                 cmd_type_len |= IXGB_TX_DESC_CMD_VLE;
1360
1361         i = tx_ring->next_to_use;
1362
1363         while (count--) {
1364                 buffer_info = &tx_ring->buffer_info[i];
1365                 tx_desc = IXGB_TX_DESC(*tx_ring, i);
1366                 tx_desc->buff_addr = cpu_to_le64(buffer_info->dma);
1367                 tx_desc->cmd_type_len =
1368                         cpu_to_le32(cmd_type_len | buffer_info->length);
1369                 tx_desc->status = status;
1370                 tx_desc->popts = popts;
1371                 tx_desc->vlan = cpu_to_le16(vlan_id);
1372
1373                 if (++i == tx_ring->count) i = 0;
1374         }
1375
1376         tx_desc->cmd_type_len |=
1377                 cpu_to_le32(IXGB_TX_DESC_CMD_EOP | IXGB_TX_DESC_CMD_RS);
1378
1379         /* Force memory writes to complete before letting h/w
1380          * know there are new descriptors to fetch.  (Only
1381          * applicable for weak-ordered memory model archs,
1382          * such as IA-64). */
1383         wmb();
1384
1385         tx_ring->next_to_use = i;
1386         IXGB_WRITE_REG(&adapter->hw, TDT, i);
1387 }
1388
1389 static int __ixgb_maybe_stop_tx(struct net_device *netdev, int size)
1390 {
1391         struct ixgb_adapter *adapter = netdev_priv(netdev);
1392         struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
1393
1394         netif_stop_queue(netdev);
1395         /* Herbert's original patch had:
1396          *  smp_mb__after_netif_stop_queue();
1397          * but since that doesn't exist yet, just open code it. */
1398         smp_mb();
1399
1400         /* We need to check again in a case another CPU has just
1401          * made room available. */
1402         if (likely(IXGB_DESC_UNUSED(tx_ring) < size))
1403                 return -EBUSY;
1404
1405         /* A reprieve! */
1406         netif_start_queue(netdev);
1407         ++adapter->restart_queue;
1408         return 0;
1409 }
1410
1411 static int ixgb_maybe_stop_tx(struct net_device *netdev,
1412                               struct ixgb_desc_ring *tx_ring, int size)
1413 {
1414         if (likely(IXGB_DESC_UNUSED(tx_ring) >= size))
1415                 return 0;
1416         return __ixgb_maybe_stop_tx(netdev, size);
1417 }
1418
1419
1420 /* Tx Descriptors needed, worst case */
1421 #define TXD_USE_COUNT(S) (((S) >> IXGB_MAX_TXD_PWR) + \
1422                          (((S) & (IXGB_MAX_DATA_PER_TXD - 1)) ? 1 : 0))
1423 #define DESC_NEEDED TXD_USE_COUNT(IXGB_MAX_DATA_PER_TXD) /* skb->date */ + \
1424         MAX_SKB_FRAGS * TXD_USE_COUNT(PAGE_SIZE) + 1 /* for context */ \
1425         + 1 /* one more needed for sentinel TSO workaround */
1426
1427 static int
1428 ixgb_xmit_frame(struct sk_buff *skb, struct net_device *netdev)
1429 {
1430         struct ixgb_adapter *adapter = netdev_priv(netdev);
1431         unsigned int first;
1432         unsigned int tx_flags = 0;
1433         int vlan_id = 0;
1434         int tso;
1435
1436         if (test_bit(__IXGB_DOWN, &adapter->flags)) {
1437                 dev_kfree_skb(skb);
1438                 return NETDEV_TX_OK;
1439         }
1440
1441         if (skb->len <= 0) {
1442                 dev_kfree_skb(skb);
1443                 return 0;
1444         }
1445
1446         if (unlikely(ixgb_maybe_stop_tx(netdev, &adapter->tx_ring,
1447                      DESC_NEEDED)))
1448                 return NETDEV_TX_BUSY;
1449
1450         if (adapter->vlgrp && vlan_tx_tag_present(skb)) {
1451                 tx_flags |= IXGB_TX_FLAGS_VLAN;
1452                 vlan_id = vlan_tx_tag_get(skb);
1453         }
1454
1455         first = adapter->tx_ring.next_to_use;
1456
1457         tso = ixgb_tso(adapter, skb);
1458         if (tso < 0) {
1459                 dev_kfree_skb(skb);
1460                 return NETDEV_TX_OK;
1461         }
1462
1463         if (likely(tso))
1464                 tx_flags |= IXGB_TX_FLAGS_TSO;
1465         else if (ixgb_tx_csum(adapter, skb))
1466                 tx_flags |= IXGB_TX_FLAGS_CSUM;
1467
1468         ixgb_tx_queue(adapter, ixgb_tx_map(adapter, skb, first), vlan_id,
1469                         tx_flags);
1470
1471         netdev->trans_start = jiffies;
1472
1473         /* Make sure there is space in the ring for the next send. */
1474         ixgb_maybe_stop_tx(netdev, &adapter->tx_ring, DESC_NEEDED);
1475
1476         return NETDEV_TX_OK;
1477 }
1478
1479 /**
1480  * ixgb_tx_timeout - Respond to a Tx Hang
1481  * @netdev: network interface device structure
1482  **/
1483
1484 static void
1485 ixgb_tx_timeout(struct net_device *netdev)
1486 {
1487         struct ixgb_adapter *adapter = netdev_priv(netdev);
1488
1489         /* Do the reset outside of interrupt context */
1490         schedule_work(&adapter->tx_timeout_task);
1491 }
1492
1493 static void
1494 ixgb_tx_timeout_task(struct work_struct *work)
1495 {
1496         struct ixgb_adapter *adapter =
1497                 container_of(work, struct ixgb_adapter, tx_timeout_task);
1498
1499         adapter->tx_timeout_count++;
1500         ixgb_down(adapter, true);
1501         ixgb_up(adapter);
1502 }
1503
1504 /**
1505  * ixgb_get_stats - Get System Network Statistics
1506  * @netdev: network interface device structure
1507  *
1508  * Returns the address of the device statistics structure.
1509  * The statistics are actually updated from the timer callback.
1510  **/
1511
1512 static struct net_device_stats *
1513 ixgb_get_stats(struct net_device *netdev)
1514 {
1515         struct ixgb_adapter *adapter = netdev_priv(netdev);
1516
1517         return &adapter->net_stats;
1518 }
1519
1520 /**
1521  * ixgb_change_mtu - Change the Maximum Transfer Unit
1522  * @netdev: network interface device structure
1523  * @new_mtu: new value for maximum frame size
1524  *
1525  * Returns 0 on success, negative on failure
1526  **/
1527
1528 static int
1529 ixgb_change_mtu(struct net_device *netdev, int new_mtu)
1530 {
1531         struct ixgb_adapter *adapter = netdev_priv(netdev);
1532         int max_frame = new_mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;
1533         int old_max_frame = netdev->mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;
1534
1535         /* MTU < 68 is an error for IPv4 traffic, just don't allow it */
1536         if ((new_mtu < 68) ||
1537             (max_frame > IXGB_MAX_JUMBO_FRAME_SIZE + ENET_FCS_LENGTH)) {
1538                 DPRINTK(PROBE, ERR, "Invalid MTU setting %d\n", new_mtu);
1539                 return -EINVAL;
1540         }
1541
1542         if (old_max_frame == max_frame)
1543                 return 0;
1544
1545         if (netif_running(netdev))
1546                 ixgb_down(adapter, true);
1547
1548         adapter->rx_buffer_len = max_frame + 8; /* + 8 for errata */
1549
1550         netdev->mtu = new_mtu;
1551
1552         if (netif_running(netdev))
1553                 ixgb_up(adapter);
1554
1555         return 0;
1556 }
1557
1558 /**
1559  * ixgb_update_stats - Update the board statistics counters.
1560  * @adapter: board private structure
1561  **/
1562
1563 void
1564 ixgb_update_stats(struct ixgb_adapter *adapter)
1565 {
1566         struct net_device *netdev = adapter->netdev;
1567         struct pci_dev *pdev = adapter->pdev;
1568
1569         /* Prevent stats update while adapter is being reset */
1570         if (pci_channel_offline(pdev))
1571                 return;
1572
1573         if ((netdev->flags & IFF_PROMISC) || (netdev->flags & IFF_ALLMULTI) ||
1574            (netdev->mc_count > IXGB_MAX_NUM_MULTICAST_ADDRESSES)) {
1575                 u64 multi = IXGB_READ_REG(&adapter->hw, MPRCL);
1576                 u32 bcast_l = IXGB_READ_REG(&adapter->hw, BPRCL);
1577                 u32 bcast_h = IXGB_READ_REG(&adapter->hw, BPRCH);
1578                 u64 bcast = ((u64)bcast_h << 32) | bcast_l;
1579
1580                 multi |= ((u64)IXGB_READ_REG(&adapter->hw, MPRCH) << 32);
1581                 /* fix up multicast stats by removing broadcasts */
1582                 if (multi >= bcast)
1583                         multi -= bcast;
1584
1585                 adapter->stats.mprcl += (multi & 0xFFFFFFFF);
1586                 adapter->stats.mprch += (multi >> 32);
1587                 adapter->stats.bprcl += bcast_l;
1588                 adapter->stats.bprch += bcast_h;
1589         } else {
1590                 adapter->stats.mprcl += IXGB_READ_REG(&adapter->hw, MPRCL);
1591                 adapter->stats.mprch += IXGB_READ_REG(&adapter->hw, MPRCH);
1592                 adapter->stats.bprcl += IXGB_READ_REG(&adapter->hw, BPRCL);
1593                 adapter->stats.bprch += IXGB_READ_REG(&adapter->hw, BPRCH);
1594         }
1595         adapter->stats.tprl += IXGB_READ_REG(&adapter->hw, TPRL);
1596         adapter->stats.tprh += IXGB_READ_REG(&adapter->hw, TPRH);
1597         adapter->stats.gprcl += IXGB_READ_REG(&adapter->hw, GPRCL);
1598         adapter->stats.gprch += IXGB_READ_REG(&adapter->hw, GPRCH);
1599         adapter->stats.uprcl += IXGB_READ_REG(&adapter->hw, UPRCL);
1600         adapter->stats.uprch += IXGB_READ_REG(&adapter->hw, UPRCH);
1601         adapter->stats.vprcl += IXGB_READ_REG(&adapter->hw, VPRCL);
1602         adapter->stats.vprch += IXGB_READ_REG(&adapter->hw, VPRCH);
1603         adapter->stats.jprcl += IXGB_READ_REG(&adapter->hw, JPRCL);
1604         adapter->stats.jprch += IXGB_READ_REG(&adapter->hw, JPRCH);
1605         adapter->stats.gorcl += IXGB_READ_REG(&adapter->hw, GORCL);
1606         adapter->stats.gorch += IXGB_READ_REG(&adapter->hw, GORCH);
1607         adapter->stats.torl += IXGB_READ_REG(&adapter->hw, TORL);
1608         adapter->stats.torh += IXGB_READ_REG(&adapter->hw, TORH);
1609         adapter->stats.rnbc += IXGB_READ_REG(&adapter->hw, RNBC);
1610         adapter->stats.ruc += IXGB_READ_REG(&adapter->hw, RUC);
1611         adapter->stats.roc += IXGB_READ_REG(&adapter->hw, ROC);
1612         adapter->stats.rlec += IXGB_READ_REG(&adapter->hw, RLEC);
1613         adapter->stats.crcerrs += IXGB_READ_REG(&adapter->hw, CRCERRS);
1614         adapter->stats.icbc += IXGB_READ_REG(&adapter->hw, ICBC);
1615         adapter->stats.ecbc += IXGB_READ_REG(&adapter->hw, ECBC);
1616         adapter->stats.mpc += IXGB_READ_REG(&adapter->hw, MPC);
1617         adapter->stats.tptl += IXGB_READ_REG(&adapter->hw, TPTL);
1618         adapter->stats.tpth += IXGB_READ_REG(&adapter->hw, TPTH);
1619         adapter->stats.gptcl += IXGB_READ_REG(&adapter->hw, GPTCL);
1620         adapter->stats.gptch += IXGB_READ_REG(&adapter->hw, GPTCH);
1621         adapter->stats.bptcl += IXGB_READ_REG(&adapter->hw, BPTCL);
1622         adapter->stats.bptch += IXGB_READ_REG(&adapter->hw, BPTCH);
1623         adapter->stats.mptcl += IXGB_READ_REG(&adapter->hw, MPTCL);
1624         adapter->stats.mptch += IXGB_READ_REG(&adapter->hw, MPTCH);
1625         adapter->stats.uptcl += IXGB_READ_REG(&adapter->hw, UPTCL);
1626         adapter->stats.uptch += IXGB_READ_REG(&adapter->hw, UPTCH);
1627         adapter->stats.vptcl += IXGB_READ_REG(&adapter->hw, VPTCL);
1628         adapter->stats.vptch += IXGB_READ_REG(&adapter->hw, VPTCH);
1629         adapter->stats.jptcl += IXGB_READ_REG(&adapter->hw, JPTCL);
1630         adapter->stats.jptch += IXGB_READ_REG(&adapter->hw, JPTCH);
1631         adapter->stats.gotcl += IXGB_READ_REG(&adapter->hw, GOTCL);
1632         adapter->stats.gotch += IXGB_READ_REG(&adapter->hw, GOTCH);
1633         adapter->stats.totl += IXGB_READ_REG(&adapter->hw, TOTL);
1634         adapter->stats.toth += IXGB_READ_REG(&adapter->hw, TOTH);
1635         adapter->stats.dc += IXGB_READ_REG(&adapter->hw, DC);
1636         adapter->stats.plt64c += IXGB_READ_REG(&adapter->hw, PLT64C);
1637         adapter->stats.tsctc += IXGB_READ_REG(&adapter->hw, TSCTC);
1638         adapter->stats.tsctfc += IXGB_READ_REG(&adapter->hw, TSCTFC);
1639         adapter->stats.ibic += IXGB_READ_REG(&adapter->hw, IBIC);
1640         adapter->stats.rfc += IXGB_READ_REG(&adapter->hw, RFC);
1641         adapter->stats.lfc += IXGB_READ_REG(&adapter->hw, LFC);
1642         adapter->stats.pfrc += IXGB_READ_REG(&adapter->hw, PFRC);
1643         adapter->stats.pftc += IXGB_READ_REG(&adapter->hw, PFTC);
1644         adapter->stats.mcfrc += IXGB_READ_REG(&adapter->hw, MCFRC);
1645         adapter->stats.mcftc += IXGB_READ_REG(&adapter->hw, MCFTC);
1646         adapter->stats.xonrxc += IXGB_READ_REG(&adapter->hw, XONRXC);
1647         adapter->stats.xontxc += IXGB_READ_REG(&adapter->hw, XONTXC);
1648         adapter->stats.xoffrxc += IXGB_READ_REG(&adapter->hw, XOFFRXC);
1649         adapter->stats.xofftxc += IXGB_READ_REG(&adapter->hw, XOFFTXC);
1650         adapter->stats.rjc += IXGB_READ_REG(&adapter->hw, RJC);
1651
1652         /* Fill out the OS statistics structure */
1653
1654         adapter->net_stats.rx_packets = adapter->stats.gprcl;
1655         adapter->net_stats.tx_packets = adapter->stats.gptcl;
1656         adapter->net_stats.rx_bytes = adapter->stats.gorcl;
1657         adapter->net_stats.tx_bytes = adapter->stats.gotcl;
1658         adapter->net_stats.multicast = adapter->stats.mprcl;
1659         adapter->net_stats.collisions = 0;
1660
1661         /* ignore RLEC as it reports errors for padded (<64bytes) frames
1662          * with a length in the type/len field */
1663         adapter->net_stats.rx_errors =
1664             /* adapter->stats.rnbc + */ adapter->stats.crcerrs +
1665             adapter->stats.ruc +
1666             adapter->stats.roc /*+ adapter->stats.rlec */  +
1667             adapter->stats.icbc +
1668             adapter->stats.ecbc + adapter->stats.mpc;
1669
1670         /* see above
1671          * adapter->net_stats.rx_length_errors = adapter->stats.rlec;
1672          */
1673
1674         adapter->net_stats.rx_crc_errors = adapter->stats.crcerrs;
1675         adapter->net_stats.rx_fifo_errors = adapter->stats.mpc;
1676         adapter->net_stats.rx_missed_errors = adapter->stats.mpc;
1677         adapter->net_stats.rx_over_errors = adapter->stats.mpc;
1678
1679         adapter->net_stats.tx_errors = 0;
1680         adapter->net_stats.rx_frame_errors = 0;
1681         adapter->net_stats.tx_aborted_errors = 0;
1682         adapter->net_stats.tx_carrier_errors = 0;
1683         adapter->net_stats.tx_fifo_errors = 0;
1684         adapter->net_stats.tx_heartbeat_errors = 0;
1685         adapter->net_stats.tx_window_errors = 0;
1686 }
1687
1688 #define IXGB_MAX_INTR 10
1689 /**
1690  * ixgb_intr - Interrupt Handler
1691  * @irq: interrupt number
1692  * @data: pointer to a network interface device structure
1693  **/
1694
1695 static irqreturn_t
1696 ixgb_intr(int irq, void *data)
1697 {
1698         struct net_device *netdev = data;
1699         struct ixgb_adapter *adapter = netdev_priv(netdev);
1700         struct ixgb_hw *hw = &adapter->hw;
1701         u32 icr = IXGB_READ_REG(hw, ICR);
1702
1703         if (unlikely(!icr))
1704                 return IRQ_NONE;  /* Not our interrupt */
1705
1706         if (unlikely(icr & (IXGB_INT_RXSEQ | IXGB_INT_LSC)))
1707                 if (!test_bit(__IXGB_DOWN, &adapter->flags))
1708                         mod_timer(&adapter->watchdog_timer, jiffies);
1709
1710         if (netif_rx_schedule_prep(netdev, &adapter->napi)) {
1711
1712                 /* Disable interrupts and register for poll. The flush
1713                   of the posted write is intentionally left out.
1714                 */
1715
1716                 IXGB_WRITE_REG(&adapter->hw, IMC, ~0);
1717                 __netif_rx_schedule(netdev, &adapter->napi);
1718         }
1719         return IRQ_HANDLED;
1720 }
1721
1722 /**
1723  * ixgb_clean - NAPI Rx polling callback
1724  * @adapter: board private structure
1725  **/
1726
1727 static int
1728 ixgb_clean(struct napi_struct *napi, int budget)
1729 {
1730         struct ixgb_adapter *adapter = container_of(napi, struct ixgb_adapter, napi);
1731         struct net_device *netdev = adapter->netdev;
1732         int work_done = 0;
1733
1734         ixgb_clean_tx_irq(adapter);
1735         ixgb_clean_rx_irq(adapter, &work_done, budget);
1736
1737         /* If budget not fully consumed, exit the polling mode */
1738         if (work_done < budget) {
1739                 netif_rx_complete(netdev, napi);
1740                 if (!test_bit(__IXGB_DOWN, &adapter->flags))
1741                         ixgb_irq_enable(adapter);
1742         }
1743
1744         return work_done;
1745 }
1746
1747 /**
1748  * ixgb_clean_tx_irq - Reclaim resources after transmit completes
1749  * @adapter: board private structure
1750  **/
1751
1752 static bool
1753 ixgb_clean_tx_irq(struct ixgb_adapter *adapter)
1754 {
1755         struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
1756         struct net_device *netdev = adapter->netdev;
1757         struct ixgb_tx_desc *tx_desc, *eop_desc;
1758         struct ixgb_buffer *buffer_info;
1759         unsigned int i, eop;
1760         bool cleaned = false;
1761
1762         i = tx_ring->next_to_clean;
1763         eop = tx_ring->buffer_info[i].next_to_watch;
1764         eop_desc = IXGB_TX_DESC(*tx_ring, eop);
1765
1766         while (eop_desc->status & IXGB_TX_DESC_STATUS_DD) {
1767
1768                 for (cleaned = false; !cleaned; ) {
1769                         tx_desc = IXGB_TX_DESC(*tx_ring, i);
1770                         buffer_info = &tx_ring->buffer_info[i];
1771
1772                         if (tx_desc->popts &
1773                            (IXGB_TX_DESC_POPTS_TXSM |
1774                             IXGB_TX_DESC_POPTS_IXSM))
1775                                 adapter->hw_csum_tx_good++;
1776
1777                         ixgb_unmap_and_free_tx_resource(adapter, buffer_info);
1778
1779                         *(u32 *)&(tx_desc->status) = 0;
1780
1781                         cleaned = (i == eop);
1782                         if (++i == tx_ring->count) i = 0;
1783                 }
1784
1785                 eop = tx_ring->buffer_info[i].next_to_watch;
1786                 eop_desc = IXGB_TX_DESC(*tx_ring, eop);
1787         }
1788
1789         tx_ring->next_to_clean = i;
1790
1791         if (unlikely(cleaned && netif_carrier_ok(netdev) &&
1792                      IXGB_DESC_UNUSED(tx_ring) >= DESC_NEEDED)) {
1793                 /* Make sure that anybody stopping the queue after this
1794                  * sees the new next_to_clean. */
1795                 smp_mb();
1796
1797                 if (netif_queue_stopped(netdev) &&
1798                     !(test_bit(__IXGB_DOWN, &adapter->flags))) {
1799                         netif_wake_queue(netdev);
1800                         ++adapter->restart_queue;
1801                 }
1802         }
1803
1804         if (adapter->detect_tx_hung) {
1805                 /* detect a transmit hang in hardware, this serializes the
1806                  * check with the clearing of time_stamp and movement of i */
1807                 adapter->detect_tx_hung = false;
1808                 if (tx_ring->buffer_info[eop].dma &&
1809                    time_after(jiffies, tx_ring->buffer_info[eop].time_stamp + HZ)
1810                    && !(IXGB_READ_REG(&adapter->hw, STATUS) &
1811                         IXGB_STATUS_TXOFF)) {
1812                         /* detected Tx unit hang */
1813                         DPRINTK(DRV, ERR, "Detected Tx Unit Hang\n"
1814                                         "  TDH                  <%x>\n"
1815                                         "  TDT                  <%x>\n"
1816                                         "  next_to_use          <%x>\n"
1817                                         "  next_to_clean        <%x>\n"
1818                                         "buffer_info[next_to_clean]\n"
1819                                         "  time_stamp           <%lx>\n"
1820                                         "  next_to_watch        <%x>\n"
1821                                         "  jiffies              <%lx>\n"
1822                                         "  next_to_watch.status <%x>\n",
1823                                 IXGB_READ_REG(&adapter->hw, TDH),
1824                                 IXGB_READ_REG(&adapter->hw, TDT),
1825                                 tx_ring->next_to_use,
1826                                 tx_ring->next_to_clean,
1827                                 tx_ring->buffer_info[eop].time_stamp,
1828                                 eop,
1829                                 jiffies,
1830                                 eop_desc->status);
1831                         netif_stop_queue(netdev);
1832                 }
1833         }
1834
1835         return cleaned;
1836 }
1837
1838 /**
1839  * ixgb_rx_checksum - Receive Checksum Offload for 82597.
1840  * @adapter: board private structure
1841  * @rx_desc: receive descriptor
1842  * @sk_buff: socket buffer with received data
1843  **/
1844
1845 static void
1846 ixgb_rx_checksum(struct ixgb_adapter *adapter,
1847                  struct ixgb_rx_desc *rx_desc,
1848                  struct sk_buff *skb)
1849 {
1850         /* Ignore Checksum bit is set OR
1851          * TCP Checksum has not been calculated
1852          */
1853         if ((rx_desc->status & IXGB_RX_DESC_STATUS_IXSM) ||
1854            (!(rx_desc->status & IXGB_RX_DESC_STATUS_TCPCS))) {
1855                 skb->ip_summed = CHECKSUM_NONE;
1856                 return;
1857         }
1858
1859         /* At this point we know the hardware did the TCP checksum */
1860         /* now look at the TCP checksum error bit */
1861         if (rx_desc->errors & IXGB_RX_DESC_ERRORS_TCPE) {
1862                 /* let the stack verify checksum errors */
1863                 skb->ip_summed = CHECKSUM_NONE;
1864                 adapter->hw_csum_rx_error++;
1865         } else {
1866                 /* TCP checksum is good */
1867                 skb->ip_summed = CHECKSUM_UNNECESSARY;
1868                 adapter->hw_csum_rx_good++;
1869         }
1870 }
1871
1872 /**
1873  * ixgb_clean_rx_irq - Send received data up the network stack,
1874  * @adapter: board private structure
1875  **/
1876
1877 static bool
1878 ixgb_clean_rx_irq(struct ixgb_adapter *adapter, int *work_done, int work_to_do)
1879 {
1880         struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
1881         struct net_device *netdev = adapter->netdev;
1882         struct pci_dev *pdev = adapter->pdev;
1883         struct ixgb_rx_desc *rx_desc, *next_rxd;
1884         struct ixgb_buffer *buffer_info, *next_buffer, *next2_buffer;
1885         u32 length;
1886         unsigned int i, j;
1887         int cleaned_count = 0;
1888         bool cleaned = false;
1889
1890         i = rx_ring->next_to_clean;
1891         rx_desc = IXGB_RX_DESC(*rx_ring, i);
1892         buffer_info = &rx_ring->buffer_info[i];
1893
1894         while (rx_desc->status & IXGB_RX_DESC_STATUS_DD) {
1895                 struct sk_buff *skb;
1896                 u8 status;
1897
1898                 if (*work_done >= work_to_do)
1899                         break;
1900
1901                 (*work_done)++;
1902                 status = rx_desc->status;
1903                 skb = buffer_info->skb;
1904                 buffer_info->skb = NULL;
1905
1906                 prefetch(skb->data - NET_IP_ALIGN);
1907
1908                 if (++i == rx_ring->count) i = 0;
1909                 next_rxd = IXGB_RX_DESC(*rx_ring, i);
1910                 prefetch(next_rxd);
1911
1912                 if ((j = i + 1) == rx_ring->count) j = 0;
1913                 next2_buffer = &rx_ring->buffer_info[j];
1914                 prefetch(next2_buffer);
1915
1916                 next_buffer = &rx_ring->buffer_info[i];
1917
1918                 cleaned = true;
1919                 cleaned_count++;
1920
1921                 pci_unmap_single(pdev,
1922                                  buffer_info->dma,
1923                                  buffer_info->length,
1924                                  PCI_DMA_FROMDEVICE);
1925                 buffer_info->dma = 0;
1926
1927                 length = le16_to_cpu(rx_desc->length);
1928                 rx_desc->length = 0;
1929
1930                 if (unlikely(!(status & IXGB_RX_DESC_STATUS_EOP))) {
1931
1932                         /* All receives must fit into a single buffer */
1933
1934                         IXGB_DBG("Receive packet consumed multiple buffers "
1935                                          "length<%x>\n", length);
1936
1937                         dev_kfree_skb_irq(skb);
1938                         goto rxdesc_done;
1939                 }
1940
1941                 if (unlikely(rx_desc->errors &
1942                     (IXGB_RX_DESC_ERRORS_CE | IXGB_RX_DESC_ERRORS_SE |
1943                      IXGB_RX_DESC_ERRORS_P | IXGB_RX_DESC_ERRORS_RXE))) {
1944                         dev_kfree_skb_irq(skb);
1945                         goto rxdesc_done;
1946                 }
1947
1948                 /* code added for copybreak, this should improve
1949                  * performance for small packets with large amounts
1950                  * of reassembly being done in the stack */
1951                 if (length < copybreak) {
1952                         struct sk_buff *new_skb =
1953                             netdev_alloc_skb(netdev, length + NET_IP_ALIGN);
1954                         if (new_skb) {
1955                                 skb_reserve(new_skb, NET_IP_ALIGN);
1956                                 skb_copy_to_linear_data_offset(new_skb,
1957                                                                -NET_IP_ALIGN,
1958                                                                (skb->data -
1959                                                                 NET_IP_ALIGN),
1960                                                                (length +
1961                                                                 NET_IP_ALIGN));
1962                                 /* save the skb in buffer_info as good */
1963                                 buffer_info->skb = skb;
1964                                 skb = new_skb;
1965                         }
1966                 }
1967                 /* end copybreak code */
1968
1969                 /* Good Receive */
1970                 skb_put(skb, length);
1971
1972                 /* Receive Checksum Offload */
1973                 ixgb_rx_checksum(adapter, rx_desc, skb);
1974
1975                 skb->protocol = eth_type_trans(skb, netdev);
1976                 if (adapter->vlgrp && (status & IXGB_RX_DESC_STATUS_VP)) {
1977                         vlan_hwaccel_receive_skb(skb, adapter->vlgrp,
1978                                                 le16_to_cpu(rx_desc->special));
1979                 } else {
1980                         netif_receive_skb(skb);
1981                 }
1982                 netdev->last_rx = jiffies;
1983
1984 rxdesc_done:
1985                 /* clean up descriptor, might be written over by hw */
1986                 rx_desc->status = 0;
1987
1988                 /* return some buffers to hardware, one at a time is too slow */
1989                 if (unlikely(cleaned_count >= IXGB_RX_BUFFER_WRITE)) {
1990                         ixgb_alloc_rx_buffers(adapter, cleaned_count);
1991                         cleaned_count = 0;
1992                 }
1993
1994                 /* use prefetched values */
1995                 rx_desc = next_rxd;
1996                 buffer_info = next_buffer;
1997         }
1998
1999         rx_ring->next_to_clean = i;
2000
2001         cleaned_count = IXGB_DESC_UNUSED(rx_ring);
2002         if (cleaned_count)
2003                 ixgb_alloc_rx_buffers(adapter, cleaned_count);
2004
2005         return cleaned;
2006 }
2007
2008 /**
2009  * ixgb_alloc_rx_buffers - Replace used receive buffers
2010  * @adapter: address of board private structure
2011  **/
2012
2013 static void
2014 ixgb_alloc_rx_buffers(struct ixgb_adapter *adapter, int cleaned_count)
2015 {
2016         struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
2017         struct net_device *netdev = adapter->netdev;
2018         struct pci_dev *pdev = adapter->pdev;
2019         struct ixgb_rx_desc *rx_desc;
2020         struct ixgb_buffer *buffer_info;
2021         struct sk_buff *skb;
2022         unsigned int i;
2023         long cleancount;
2024
2025         i = rx_ring->next_to_use;
2026         buffer_info = &rx_ring->buffer_info[i];
2027         cleancount = IXGB_DESC_UNUSED(rx_ring);
2028
2029
2030         /* leave three descriptors unused */
2031         while (--cleancount > 2 && cleaned_count--) {
2032                 /* recycle! its good for you */
2033                 skb = buffer_info->skb;
2034                 if (skb) {
2035                         skb_trim(skb, 0);
2036                         goto map_skb;
2037                 }
2038
2039                 skb = netdev_alloc_skb(netdev, adapter->rx_buffer_len
2040                                        + NET_IP_ALIGN);
2041                 if (unlikely(!skb)) {
2042                         /* Better luck next round */
2043                         adapter->alloc_rx_buff_failed++;
2044                         break;
2045                 }
2046
2047                 /* Make buffer alignment 2 beyond a 16 byte boundary
2048                  * this will result in a 16 byte aligned IP header after
2049                  * the 14 byte MAC header is removed
2050                  */
2051                 skb_reserve(skb, NET_IP_ALIGN);
2052
2053                 buffer_info->skb = skb;
2054                 buffer_info->length = adapter->rx_buffer_len;
2055 map_skb:
2056                 buffer_info->dma = pci_map_single(pdev,
2057                                                   skb->data,
2058                                                   adapter->rx_buffer_len,
2059                                                   PCI_DMA_FROMDEVICE);
2060
2061                 rx_desc = IXGB_RX_DESC(*rx_ring, i);
2062                 rx_desc->buff_addr = cpu_to_le64(buffer_info->dma);
2063                 /* guarantee DD bit not set now before h/w gets descriptor
2064                  * this is the rest of the workaround for h/w double
2065                  * writeback. */
2066                 rx_desc->status = 0;
2067
2068
2069                 if (++i == rx_ring->count) i = 0;
2070                 buffer_info = &rx_ring->buffer_info[i];
2071         }
2072
2073         if (likely(rx_ring->next_to_use != i)) {
2074                 rx_ring->next_to_use = i;
2075                 if (unlikely(i-- == 0))
2076                         i = (rx_ring->count - 1);
2077
2078                 /* Force memory writes to complete before letting h/w
2079                  * know there are new descriptors to fetch.  (Only
2080                  * applicable for weak-ordered memory model archs, such
2081                  * as IA-64). */
2082                 wmb();
2083                 IXGB_WRITE_REG(&adapter->hw, RDT, i);
2084         }
2085 }
2086
2087 /**
2088  * ixgb_vlan_rx_register - enables or disables vlan tagging/stripping.
2089  *
2090  * @param netdev network interface device structure
2091  * @param grp indicates to enable or disable tagging/stripping
2092  **/
2093 static void
2094 ixgb_vlan_rx_register(struct net_device *netdev, struct vlan_group *grp)
2095 {
2096         struct ixgb_adapter *adapter = netdev_priv(netdev);
2097         u32 ctrl, rctl;
2098
2099         ixgb_irq_disable(adapter);
2100         adapter->vlgrp = grp;
2101
2102         if (grp) {
2103                 /* enable VLAN tag insert/strip */
2104                 ctrl = IXGB_READ_REG(&adapter->hw, CTRL0);
2105                 ctrl |= IXGB_CTRL0_VME;
2106                 IXGB_WRITE_REG(&adapter->hw, CTRL0, ctrl);
2107
2108                 /* enable VLAN receive filtering */
2109
2110                 rctl = IXGB_READ_REG(&adapter->hw, RCTL);
2111                 rctl &= ~IXGB_RCTL_CFIEN;
2112                 IXGB_WRITE_REG(&adapter->hw, RCTL, rctl);
2113         } else {
2114                 /* disable VLAN tag insert/strip */
2115
2116                 ctrl = IXGB_READ_REG(&adapter->hw, CTRL0);
2117                 ctrl &= ~IXGB_CTRL0_VME;
2118                 IXGB_WRITE_REG(&adapter->hw, CTRL0, ctrl);
2119         }
2120
2121         /* don't enable interrupts unless we are UP */
2122         if (adapter->netdev->flags & IFF_UP)
2123                 ixgb_irq_enable(adapter);
2124 }
2125
2126 static void
2127 ixgb_vlan_rx_add_vid(struct net_device *netdev, u16 vid)
2128 {
2129         struct ixgb_adapter *adapter = netdev_priv(netdev);
2130         u32 vfta, index;
2131
2132         /* add VID to filter table */
2133
2134         index = (vid >> 5) & 0x7F;
2135         vfta = IXGB_READ_REG_ARRAY(&adapter->hw, VFTA, index);
2136         vfta |= (1 << (vid & 0x1F));
2137         ixgb_write_vfta(&adapter->hw, index, vfta);
2138 }
2139
2140 static void
2141 ixgb_vlan_rx_kill_vid(struct net_device *netdev, u16 vid)
2142 {
2143         struct ixgb_adapter *adapter = netdev_priv(netdev);
2144         u32 vfta, index;
2145
2146         ixgb_irq_disable(adapter);
2147
2148         vlan_group_set_device(adapter->vlgrp, vid, NULL);
2149
2150         /* don't enable interrupts unless we are UP */
2151         if (adapter->netdev->flags & IFF_UP)
2152                 ixgb_irq_enable(adapter);
2153
2154         /* remove VID from filter table */
2155
2156         index = (vid >> 5) & 0x7F;
2157         vfta = IXGB_READ_REG_ARRAY(&adapter->hw, VFTA, index);
2158         vfta &= ~(1 << (vid & 0x1F));
2159         ixgb_write_vfta(&adapter->hw, index, vfta);
2160 }
2161
2162 static void
2163 ixgb_restore_vlan(struct ixgb_adapter *adapter)
2164 {
2165         ixgb_vlan_rx_register(adapter->netdev, adapter->vlgrp);
2166
2167         if (adapter->vlgrp) {
2168                 u16 vid;
2169                 for (vid = 0; vid < VLAN_GROUP_ARRAY_LEN; vid++) {
2170                         if (!vlan_group_get_device(adapter->vlgrp, vid))
2171                                 continue;
2172                         ixgb_vlan_rx_add_vid(adapter->netdev, vid);
2173                 }
2174         }
2175 }
2176
2177 #ifdef CONFIG_NET_POLL_CONTROLLER
2178 /*
2179  * Polling 'interrupt' - used by things like netconsole to send skbs
2180  * without having to re-enable interrupts. It's not called while
2181  * the interrupt routine is executing.
2182  */
2183
2184 static void ixgb_netpoll(struct net_device *dev)
2185 {
2186         struct ixgb_adapter *adapter = netdev_priv(dev);
2187
2188         disable_irq(adapter->pdev->irq);
2189         ixgb_intr(adapter->pdev->irq, dev);
2190         enable_irq(adapter->pdev->irq);
2191 }
2192 #endif
2193
2194 /**
2195  * ixgb_io_error_detected() - called when PCI error is detected
2196  * @pdev    pointer to pci device with error
2197  * @state   pci channel state after error
2198  *
2199  * This callback is called by the PCI subsystem whenever
2200  * a PCI bus error is detected.
2201  */
2202 static pci_ers_result_t ixgb_io_error_detected(struct pci_dev *pdev,
2203                                                enum pci_channel_state state)
2204 {
2205         struct net_device *netdev = pci_get_drvdata(pdev);
2206         struct ixgb_adapter *adapter = netdev_priv(netdev);
2207
2208         if (netif_running(netdev))
2209                 ixgb_down(adapter, true);
2210
2211         pci_disable_device(pdev);
2212
2213         /* Request a slot reset. */
2214         return PCI_ERS_RESULT_NEED_RESET;
2215 }
2216
2217 /**
2218  * ixgb_io_slot_reset - called after the pci bus has been reset.
2219  * @pdev    pointer to pci device with error
2220  *
2221  * This callback is called after the PCI bus has been reset.
2222  * Basically, this tries to restart the card from scratch.
2223  * This is a shortened version of the device probe/discovery code,
2224  * it resembles the first-half of the ixgb_probe() routine.
2225  */
2226 static pci_ers_result_t ixgb_io_slot_reset(struct pci_dev *pdev)
2227 {
2228         struct net_device *netdev = pci_get_drvdata(pdev);
2229         struct ixgb_adapter *adapter = netdev_priv(netdev);
2230
2231         if (pci_enable_device(pdev)) {
2232                 DPRINTK(PROBE, ERR, "Cannot re-enable PCI device after reset.\n");
2233                 return PCI_ERS_RESULT_DISCONNECT;
2234         }
2235
2236         /* Perform card reset only on one instance of the card */
2237         if (0 != PCI_FUNC (pdev->devfn))
2238                 return PCI_ERS_RESULT_RECOVERED;
2239
2240         pci_set_master(pdev);
2241
2242         netif_carrier_off(netdev);
2243         netif_stop_queue(netdev);
2244         ixgb_reset(adapter);
2245
2246         /* Make sure the EEPROM is good */
2247         if (!ixgb_validate_eeprom_checksum(&adapter->hw)) {
2248                 DPRINTK(PROBE, ERR, "After reset, the EEPROM checksum is not valid.\n");
2249                 return PCI_ERS_RESULT_DISCONNECT;
2250         }
2251         ixgb_get_ee_mac_addr(&adapter->hw, netdev->dev_addr);
2252         memcpy(netdev->perm_addr, netdev->dev_addr, netdev->addr_len);
2253
2254         if (!is_valid_ether_addr(netdev->perm_addr)) {
2255                 DPRINTK(PROBE, ERR, "After reset, invalid MAC address.\n");
2256                 return PCI_ERS_RESULT_DISCONNECT;
2257         }
2258
2259         return PCI_ERS_RESULT_RECOVERED;
2260 }
2261
2262 /**
2263  * ixgb_io_resume - called when its OK to resume normal operations
2264  * @pdev    pointer to pci device with error
2265  *
2266  * The error recovery driver tells us that its OK to resume
2267  * normal operation. Implementation resembles the second-half
2268  * of the ixgb_probe() routine.
2269  */
2270 static void ixgb_io_resume(struct pci_dev *pdev)
2271 {
2272         struct net_device *netdev = pci_get_drvdata(pdev);
2273         struct ixgb_adapter *adapter = netdev_priv(netdev);
2274
2275         pci_set_master(pdev);
2276
2277         if (netif_running(netdev)) {
2278                 if (ixgb_up(adapter)) {
2279                         printk ("ixgb: can't bring device back up after reset\n");
2280                         return;
2281                 }
2282         }
2283
2284         netif_device_attach(netdev);
2285         mod_timer(&adapter->watchdog_timer, jiffies);
2286 }
2287
2288 /* ixgb_main.c */