drivers/net/ixgb/ixgb_main.c

   1 /*******************************************************************************
   2
   3   Intel PRO/10GbE Linux driver
   4   Copyright(c) 1999 - 2006 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 #ifndef CONFIG_IXGB_NAPI
  35 #define DRIVERNAPI
  36 #else
  37 #define DRIVERNAPI "-NAPI"
  38 #endif
  39 #define DRV_VERSION             "1.0.126-k4"DRIVERNAPI
  40 const char ixgb_driver_version[] = DRV_VERSION;
  41 static const char ixgb_copyright[] = "Copyright (c) 1999-2006 Intel Corporation.";
  42
  43 #define IXGB_CB_LENGTH 256
  44 static unsigned int copybreak __read_mostly = IXGB_CB_LENGTH;
  45 module_param(copybreak, uint, 0644);
  46 MODULE_PARM_DESC(copybreak,
  47         "Maximum size of packet that is copied to a new buffer on receive");
  48
  49 /* ixgb_pci_tbl - PCI Device ID Table
  50  *
  51  * Wildcard entries (PCI_ANY_ID) should come last
  52  * Last entry must be all 0s
  53  *
  54  * { Vendor ID, Device ID, SubVendor ID, SubDevice ID,
  55  *   Class, Class Mask, private data (not used) }
  56  */
  57 static struct pci_device_id ixgb_pci_tbl[] = {
  58         {INTEL_VENDOR_ID, IXGB_DEVICE_ID_82597EX,
  59          PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
  60         {INTEL_VENDOR_ID, IXGB_DEVICE_ID_82597EX_CX4,
  61          PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
  62         {INTEL_VENDOR_ID, IXGB_DEVICE_ID_82597EX_SR,
  63          PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
  64         {INTEL_VENDOR_ID, IXGB_DEVICE_ID_82597EX_LR,
  65          PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
  66
  67         /* required last entry */
  68         {0,}
  69 };
  70
  71 MODULE_DEVICE_TABLE(pci, ixgb_pci_tbl);
  72
  73 /* Local Function Prototypes */
  74 static int ixgb_init_module(void);
  75 static void ixgb_exit_module(void);
  76 static int ixgb_probe(struct pci_dev *pdev, const struct pci_device_id *ent);
  77 static void __devexit ixgb_remove(struct pci_dev *pdev);
  78 static int ixgb_sw_init(struct ixgb_adapter *adapter);
  79 static int ixgb_open(struct net_device *netdev);
  80 static int ixgb_close(struct net_device *netdev);
  81 static void ixgb_configure_tx(struct ixgb_adapter *adapter);
  82 static void ixgb_configure_rx(struct ixgb_adapter *adapter);
  83 static void ixgb_setup_rctl(struct ixgb_adapter *adapter);
  84 static void ixgb_clean_tx_ring(struct ixgb_adapter *adapter);
  85 static void ixgb_clean_rx_ring(struct ixgb_adapter *adapter);
  86 static void ixgb_set_multi(struct net_device *netdev);
  87 static void ixgb_watchdog(unsigned long data);
  88 static int ixgb_xmit_frame(struct sk_buff *skb, struct net_device *netdev);
  89 static struct net_device_stats *ixgb_get_stats(struct net_device *netdev);
  90 static int ixgb_change_mtu(struct net_device *netdev, int new_mtu);
  91 static int ixgb_set_mac(struct net_device *netdev, void *p);
  92 static irqreturn_t ixgb_intr(int irq, void *data);
  93 static bool ixgb_clean_tx_irq(struct ixgb_adapter *adapter);
  94
  95 #ifdef CONFIG_IXGB_NAPI
  96 static int ixgb_clean(struct napi_struct *, int);
  97 static bool ixgb_clean_rx_irq(struct ixgb_adapter *, int *, int);
  98 #else
  99 static bool ixgb_clean_rx_irq(struct ixgb_adapter *);
 100 #endif
 101 static void ixgb_alloc_rx_buffers(struct ixgb_adapter *);
 102
 103 static void ixgb_tx_timeout(struct net_device *dev);
 104 static void ixgb_tx_timeout_task(struct work_struct *work);
 105
 106 static void ixgb_vlan_rx_register(struct net_device *netdev,
 107                                   struct vlan_group *grp);
 108 static void ixgb_vlan_rx_add_vid(struct net_device *netdev, u16 vid);
 109 static void ixgb_vlan_rx_kill_vid(struct net_device *netdev, u16 vid);
 110 static void ixgb_restore_vlan(struct ixgb_adapter *adapter);
 111
 112 #ifdef CONFIG_NET_POLL_CONTROLLER
 113 /* for netdump / net console */
 114 static void ixgb_netpoll(struct net_device *dev);
 115 #endif
 116
 117 static pci_ers_result_t ixgb_io_error_detected (struct pci_dev *pdev,
 118                              enum pci_channel_state state);
 119 static pci_ers_result_t ixgb_io_slot_reset (struct pci_dev *pdev);
 120 static void ixgb_io_resume (struct pci_dev *pdev);
 121
 122 static struct pci_error_handlers ixgb_err_handler = {
 123         .error_detected = ixgb_io_error_detected,
 124         .slot_reset = ixgb_io_slot_reset,
 125         .resume = ixgb_io_resume,
 126 };
 127
 128 static struct pci_driver ixgb_driver = {
 129         .name     = ixgb_driver_name,
 130         .id_table = ixgb_pci_tbl,
 131         .probe    = ixgb_probe,
 132         .remove   = __devexit_p(ixgb_remove),
 133         .err_handler = &ixgb_err_handler
 134 };
 135
 136 MODULE_AUTHOR("Intel Corporation, <linux.nics@intel.com>");
 137 MODULE_DESCRIPTION("Intel(R) PRO/10GbE Network Driver");
 138 MODULE_LICENSE("GPL");
 139 MODULE_VERSION(DRV_VERSION);
 140
 141 #define DEFAULT_DEBUG_LEVEL_SHIFT 3
 142 static int debug = DEFAULT_DEBUG_LEVEL_SHIFT;
 143 module_param(debug, int, 0);
 144 MODULE_PARM_DESC(debug, "Debug level (0=none,...,16=all)");
 145
 146 /**
 147  * ixgb_init_module - Driver Registration Routine
 148  *
 149  * ixgb_init_module is the first routine called when the driver is
 150  * loaded. All it does is register with the PCI subsystem.
 151  **/
 152
 153 static int __init
 154 ixgb_init_module(void)
 155 {
 156         printk(KERN_INFO "%s - version %s\n",
 157                ixgb_driver_string, ixgb_driver_version);
 158
 159         printk(KERN_INFO "%s\n", ixgb_copyright);
 160
 161         return pci_register_driver(&ixgb_driver);
 162 }
 163
 164 module_init(ixgb_init_module);
 165
 166 /**
 167  * ixgb_exit_module - Driver Exit Cleanup Routine
 168  *
 169  * ixgb_exit_module is called just before the driver is removed
 170  * from memory.
 171  **/
 172
 173 static void __exit
 174 ixgb_exit_module(void)
 175 {
 176         pci_unregister_driver(&ixgb_driver);
 177 }
 178
 179 module_exit(ixgb_exit_module);
 180
 181 /**
 182  * ixgb_irq_disable - Mask off interrupt generation on the NIC
 183  * @adapter: board private structure
 184  **/
 185
 186 static void
 187 ixgb_irq_disable(struct ixgb_adapter *adapter)
 188 {
 189         IXGB_WRITE_REG(&adapter->hw, IMC, ~0);
 190         IXGB_WRITE_FLUSH(&adapter->hw);
 191         synchronize_irq(adapter->pdev->irq);
 192 }
 193
 194 /**
 195  * ixgb_irq_enable - Enable default interrupt generation settings
 196  * @adapter: board private structure
 197  **/
 198
 199 static void
 200 ixgb_irq_enable(struct ixgb_adapter *adapter)
 201 {
 202         u32 val = IXGB_INT_RXT0 | IXGB_INT_RXDMT0 |
 203                   IXGB_INT_TXDW | IXGB_INT_LSC;
 204         if (adapter->hw.subsystem_vendor_id == SUN_SUBVENDOR_ID)
 205                 val |= IXGB_INT_GPI0;
 206         IXGB_WRITE_REG(&adapter->hw, IMS, val);
 207         IXGB_WRITE_FLUSH(&adapter->hw);
 208 }
 209
 210 int
 211 ixgb_up(struct ixgb_adapter *adapter)
 212 {
 213         struct net_device *netdev = adapter->netdev;
 214         int err, irq_flags = IRQF_SHARED;
 215         int max_frame = netdev->mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;
 216         struct ixgb_hw *hw = &adapter->hw;
 217
 218         /* hardware has been reset, we need to reload some things */
 219
 220         ixgb_rar_set(hw, netdev->dev_addr, 0);
 221         ixgb_set_multi(netdev);
 222
 223         ixgb_restore_vlan(adapter);
 224
 225         ixgb_configure_tx(adapter);
 226         ixgb_setup_rctl(adapter);
 227         ixgb_configure_rx(adapter);
 228         ixgb_alloc_rx_buffers(adapter);
 229
 230         /* disable interrupts and get the hardware into a known state */
 231         IXGB_WRITE_REG(&adapter->hw, IMC, 0xffffffff);
 232
 233         /* only enable MSI if bus is in PCI-X mode */
 234         if (IXGB_READ_REG(&adapter->hw, STATUS) & IXGB_STATUS_PCIX_MODE) {
 235                 err = pci_enable_msi(adapter->pdev);
 236                 if (!err) {
 237                         adapter->have_msi = 1;
 238                         irq_flags = 0;
 239                 }
 240                 /* proceed to try to request regular interrupt */
 241         }
 242
 243         err = request_irq(adapter->pdev->irq, &ixgb_intr, irq_flags,
 244                           netdev->name, netdev);
 245         if (err) {
 246                 if (adapter->have_msi)
 247                         pci_disable_msi(adapter->pdev);
 248                 DPRINTK(PROBE, ERR,
 249                  "Unable to allocate interrupt Error: %d\n", err);
 250                 return err;
 251         }
 252
 253         if ((hw->max_frame_size != max_frame) ||
 254                 (hw->max_frame_size !=
 255                 (IXGB_READ_REG(hw, MFS) >> IXGB_MFS_SHIFT))) {
 256
 257                 hw->max_frame_size = max_frame;
 258
 259                 IXGB_WRITE_REG(hw, MFS, hw->max_frame_size << IXGB_MFS_SHIFT);
 260
 261                 if (hw->max_frame_size >
 262                    IXGB_MAX_ENET_FRAME_SIZE_WITHOUT_FCS + ENET_FCS_LENGTH) {
 263                         u32 ctrl0 = IXGB_READ_REG(hw, CTRL0);
 264
 265                         if (!(ctrl0 & IXGB_CTRL0_JFE)) {
 266                                 ctrl0 |= IXGB_CTRL0_JFE;
 267                                 IXGB_WRITE_REG(hw, CTRL0, ctrl0);
 268                         }
 269                 }
 270         }
 271
 272         clear_bit(__IXGB_DOWN, &adapter->flags);
 273
 274 #ifdef CONFIG_IXGB_NAPI
 275         napi_enable(&adapter->napi);
 276 #endif
 277         ixgb_irq_enable(adapter);
 278
 279         mod_timer(&adapter->watchdog_timer, jiffies);
 280
 281         return 0;
 282 }
 283
 284 void
 285 ixgb_down(struct ixgb_adapter *adapter, bool kill_watchdog)
 286 {
 287         struct net_device *netdev = adapter->netdev;
 288
 289         /* prevent the interrupt handler from restarting watchdog */
 290         set_bit(__IXGB_DOWN, &adapter->flags);
 291
 292 #ifdef CONFIG_IXGB_NAPI
 293         napi_disable(&adapter->napi);
 294 #endif
 295         /* waiting for NAPI to complete can re-enable interrupts */
 296         ixgb_irq_disable(adapter);
 297         free_irq(adapter->pdev->irq, netdev);
 298
 299         if (adapter->have_msi)
 300                 pci_disable_msi(adapter->pdev);
 301
 302         if (kill_watchdog)
 303                 del_timer_sync(&adapter->watchdog_timer);
 304
 305         adapter->link_speed = 0;
 306         adapter->link_duplex = 0;
 307         netif_carrier_off(netdev);
 308         netif_stop_queue(netdev);
 309
 310         ixgb_reset(adapter);
 311         ixgb_clean_tx_ring(adapter);
 312         ixgb_clean_rx_ring(adapter);
 313 }
 314
 315 void
 316 ixgb_reset(struct ixgb_adapter *adapter)
 317 {
 318         struct ixgb_hw *hw = &adapter->hw;
 319
 320         ixgb_adapter_stop(hw);
 321         if (!ixgb_init_hw(hw))
 322                 DPRINTK(PROBE, ERR, "ixgb_init_hw failed.\n");
 323
 324         /* restore frame size information */
 325         IXGB_WRITE_REG(hw, MFS, hw->max_frame_size << IXGB_MFS_SHIFT);
 326         if (hw->max_frame_size >
 327             IXGB_MAX_ENET_FRAME_SIZE_WITHOUT_FCS + ENET_FCS_LENGTH) {
 328                 u32 ctrl0 = IXGB_READ_REG(hw, CTRL0);
 329                 if (!(ctrl0 & IXGB_CTRL0_JFE)) {
 330                         ctrl0 |= IXGB_CTRL0_JFE;
 331                         IXGB_WRITE_REG(hw, CTRL0, ctrl0);
 332                 }
 333         }
 334 }
 335
 336 /**
 337  * ixgb_probe - Device Initialization Routine
 338  * @pdev: PCI device information struct
 339  * @ent: entry in ixgb_pci_tbl
 340  *
 341  * Returns 0 on success, negative on failure
 342  *
 343  * ixgb_probe initializes an adapter identified by a pci_dev structure.
 344  * The OS initialization, configuring of the adapter private structure,
 345  * and a hardware reset occur.
 346  **/
 347
 348 static int __devinit
 349 ixgb_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
 350 {
 351         struct net_device *netdev = NULL;
 352         struct ixgb_adapter *adapter;
 353         static int cards_found = 0;
 354         int pci_using_dac;
 355         int i;
 356         int err;
 357
 358         if ((err = pci_enable_device(pdev)))
 359                 return err;
 360
 361         if (!(err = pci_set_dma_mask(pdev, DMA_64BIT_MASK)) &&
 362            !(err = pci_set_consistent_dma_mask(pdev, DMA_64BIT_MASK))) {
 363                 pci_using_dac = 1;
 364         } else {
 365                 if ((err = pci_set_dma_mask(pdev, DMA_32BIT_MASK)) ||
 366                    (err = pci_set_consistent_dma_mask(pdev, DMA_32BIT_MASK))) {
 367                         printk(KERN_ERR
 368                          "ixgb: No usable DMA configuration, aborting\n");
 369                         goto err_dma_mask;
 370                 }
 371                 pci_using_dac = 0;
 372         }
 373
 374         if ((err = pci_request_regions(pdev, ixgb_driver_name)))
 375                 goto err_request_regions;
 376
 377         pci_set_master(pdev);
 378
 379         netdev = alloc_etherdev(sizeof(struct ixgb_adapter));
 380         if (!netdev) {
 381                 err = -ENOMEM;
 382                 goto err_alloc_etherdev;
 383         }
 384
 385         SET_NETDEV_DEV(netdev, &pdev->dev);
 386
 387         pci_set_drvdata(pdev, netdev);
 388         adapter = netdev_priv(netdev);
 389         adapter->netdev = netdev;
 390         adapter->pdev = pdev;
 391         adapter->hw.back = adapter;
 392         adapter->msg_enable = netif_msg_init(debug, DEFAULT_DEBUG_LEVEL_SHIFT);
 393
 394         adapter->hw.hw_addr = ioremap(pci_resource_start(pdev, BAR_0),
 395                                       pci_resource_len(pdev, BAR_0));
 396         if (!adapter->hw.hw_addr) {
 397                 err = -EIO;
 398                 goto err_ioremap;
 399         }
 400
 401         for (i = BAR_1; i <= BAR_5; i++) {
 402                 if (pci_resource_len(pdev, i) == 0)
 403                         continue;
 404                 if (pci_resource_flags(pdev, i) & IORESOURCE_IO) {
 405                         adapter->hw.io_base = pci_resource_start(pdev, i);
 406                         break;
 407                 }
 408         }
 409
 410         netdev->open = &ixgb_open;
 411         netdev->stop = &ixgb_close;
 412         netdev->hard_start_xmit = &ixgb_xmit_frame;
 413         netdev->get_stats = &ixgb_get_stats;
 414         netdev->set_multicast_list = &ixgb_set_multi;
 415         netdev->set_mac_address = &ixgb_set_mac;
 416         netdev->change_mtu = &ixgb_change_mtu;
 417         ixgb_set_ethtool_ops(netdev);
 418         netdev->tx_timeout = &ixgb_tx_timeout;
 419         netdev->watchdog_timeo = 5 * HZ;
 420 #ifdef CONFIG_IXGB_NAPI
 421         netif_napi_add(netdev, &adapter->napi, ixgb_clean, 64);
 422 #endif
 423         netdev->vlan_rx_register = ixgb_vlan_rx_register;
 424         netdev->vlan_rx_add_vid = ixgb_vlan_rx_add_vid;
 425         netdev->vlan_rx_kill_vid = ixgb_vlan_rx_kill_vid;
 426 #ifdef CONFIG_NET_POLL_CONTROLLER
 427         netdev->poll_controller = ixgb_netpoll;
 428 #endif
 429
 430         strncpy(netdev->name, pci_name(pdev), sizeof(netdev->name) - 1);
 431
 432         adapter->bd_number = cards_found;
 433         adapter->link_speed = 0;
 434         adapter->link_duplex = 0;
 435
 436         /* setup the private structure */
 437
 438         if ((err = ixgb_sw_init(adapter)))
 439                 goto err_sw_init;
 440
 441         netdev->features = NETIF_F_SG |
 442                            NETIF_F_HW_CSUM |
 443                            NETIF_F_HW_VLAN_TX |
 444                            NETIF_F_HW_VLAN_RX |
 445                            NETIF_F_HW_VLAN_FILTER;
 446         netdev->features |= NETIF_F_TSO;
 447
 448         if (pci_using_dac)
 449                 netdev->features |= NETIF_F_HIGHDMA;
 450
 451         /* make sure the EEPROM is good */
 452
 453         if (!ixgb_validate_eeprom_checksum(&adapter->hw)) {
 454                 DPRINTK(PROBE, ERR, "The EEPROM Checksum Is Not Valid\n");
 455                 err = -EIO;
 456                 goto err_eeprom;
 457         }
 458
 459         ixgb_get_ee_mac_addr(&adapter->hw, netdev->dev_addr);
 460         memcpy(netdev->perm_addr, netdev->dev_addr, netdev->addr_len);
 461
 462         if (!is_valid_ether_addr(netdev->perm_addr)) {
 463                 DPRINTK(PROBE, ERR, "Invalid MAC Address\n");
 464                 err = -EIO;
 465                 goto err_eeprom;
 466         }
 467
 468         adapter->part_num = ixgb_get_ee_pba_number(&adapter->hw);
 469
 470         init_timer(&adapter->watchdog_timer);
 471         adapter->watchdog_timer.function = &ixgb_watchdog;
 472         adapter->watchdog_timer.data = (unsigned long)adapter;
 473
 474         INIT_WORK(&adapter->tx_timeout_task, ixgb_tx_timeout_task);
 475
 476         strcpy(netdev->name, "eth%d");
 477         if ((err = register_netdev(netdev)))
 478                 goto err_register;
 479
 480         /* we're going to reset, so assume we have no link for now */
 481
 482         netif_carrier_off(netdev);
 483         netif_stop_queue(netdev);
 484
 485         DPRINTK(PROBE, INFO, "Intel(R) PRO/10GbE Network Connection\n");
 486         ixgb_check_options(adapter);
 487         /* reset the hardware with the new settings */
 488
 489         ixgb_reset(adapter);
 490
 491         cards_found++;
 492         return 0;
 493
 494 err_register:
 495 err_sw_init:
 496 err_eeprom:
 497         iounmap(adapter->hw.hw_addr);
 498 err_ioremap:
 499         free_netdev(netdev);
 500 err_alloc_etherdev:
 501         pci_release_regions(pdev);
 502 err_request_regions:
 503 err_dma_mask:
 504         pci_disable_device(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         flush_scheduled_work();
 525
 526         unregister_netdev(netdev);
 527
 528         iounmap(adapter->hw.hw_addr);
 529         pci_release_regions(pdev);
 530
 531         free_netdev(netdev);
 532 }
 533
 534 /**
 535  * ixgb_sw_init - Initialize general software structures (struct ixgb_adapter)
 536  * @adapter: board private structure to initialize
 537  *
 538  * ixgb_sw_init initializes the Adapter private data structure.
 539  * Fields are initialized based on PCI device information and
 540  * OS network device settings (MTU size).
 541  **/
 542
 543 static int __devinit
 544 ixgb_sw_init(struct ixgb_adapter *adapter)
 545 {
 546         struct ixgb_hw *hw = &adapter->hw;
 547         struct net_device *netdev = adapter->netdev;
 548         struct pci_dev *pdev = adapter->pdev;
 549
 550         /* PCI config space info */
 551
 552         hw->vendor_id = pdev->vendor;
 553         hw->device_id = pdev->device;
 554         hw->subsystem_vendor_id = pdev->subsystem_vendor;
 555         hw->subsystem_id = pdev->subsystem_device;
 556
 557         hw->max_frame_size = netdev->mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;
 558         adapter->rx_buffer_len = hw->max_frame_size + 8; /* + 8 for errata */
 559
 560         if ((hw->device_id == IXGB_DEVICE_ID_82597EX)
 561            || (hw->device_id == IXGB_DEVICE_ID_82597EX_CX4)
 562            || (hw->device_id == IXGB_DEVICE_ID_82597EX_LR)
 563            || (hw->device_id == IXGB_DEVICE_ID_82597EX_SR))
 564                 hw->mac_type = ixgb_82597;
 565         else {
 566                 /* should never have loaded on this device */
 567                 DPRINTK(PROBE, ERR, "unsupported device id\n");
 568         }
 569
 570         /* enable flow control to be programmed */
 571         hw->fc.send_xon = 1;
 572
 573         set_bit(__IXGB_DOWN, &adapter->flags);
 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                 DPRINTK(PROBE, ERR,
 664                  "Unable to allocate transmit descriptor ring memory\n");
 665                 return -ENOMEM;
 666         }
 667         memset(txdr->buffer_info, 0, size);
 668
 669         /* round up to nearest 4K */
 670
 671         txdr->size = txdr->count * sizeof(struct ixgb_tx_desc);
 672         txdr->size = ALIGN(txdr->size, 4096);
 673
 674         txdr->desc = pci_alloc_consistent(pdev, txdr->size, &txdr->dma);
 675         if (!txdr->desc) {
 676                 vfree(txdr->buffer_info);
 677                 DPRINTK(PROBE, ERR,
 678                  "Unable to allocate transmit descriptor memory\n");
 679                 return -ENOMEM;
 680         }
 681         memset(txdr->desc, 0, txdr->size);
 682
 683         txdr->next_to_use = 0;
 684         txdr->next_to_clean = 0;
 685
 686         return 0;
 687 }
 688
 689 /**
 690  * ixgb_configure_tx - Configure 82597 Transmit Unit after Reset.
 691  * @adapter: board private structure
 692  *
 693  * Configure the Tx unit of the MAC after a reset.
 694  **/
 695
 696 static void
 697 ixgb_configure_tx(struct ixgb_adapter *adapter)
 698 {
 699         u64 tdba = adapter->tx_ring.dma;
 700         u32 tdlen = adapter->tx_ring.count * sizeof(struct ixgb_tx_desc);
 701         u32 tctl;
 702         struct ixgb_hw *hw = &adapter->hw;
 703
 704         /* Setup the Base and Length of the Tx Descriptor Ring
 705          * tx_ring.dma can be either a 32 or 64 bit value
 706          */
 707
 708         IXGB_WRITE_REG(hw, TDBAL, (tdba & 0x00000000ffffffffULL));
 709         IXGB_WRITE_REG(hw, TDBAH, (tdba >> 32));
 710
 711         IXGB_WRITE_REG(hw, TDLEN, tdlen);
 712
 713         /* Setup the HW Tx Head and Tail descriptor pointers */
 714
 715         IXGB_WRITE_REG(hw, TDH, 0);
 716         IXGB_WRITE_REG(hw, TDT, 0);
 717
 718         /* don't set up txdctl, it induces performance problems if configured
 719          * incorrectly */
 720         /* Set the Tx Interrupt Delay register */
 721
 722         IXGB_WRITE_REG(hw, TIDV, adapter->tx_int_delay);
 723
 724         /* Program the Transmit Control Register */
 725
 726         tctl = IXGB_TCTL_TCE | IXGB_TCTL_TXEN | IXGB_TCTL_TPDE;
 727         IXGB_WRITE_REG(hw, TCTL, tctl);
 728
 729         /* Setup Transmit Descriptor Settings for this adapter */
 730         adapter->tx_cmd_type =
 731                 IXGB_TX_DESC_TYPE |
 732                 (adapter->tx_int_delay_enable ? IXGB_TX_DESC_CMD_IDE : 0);
 733 }
 734
 735 /**
 736  * ixgb_setup_rx_resources - allocate Rx resources (Descriptors)
 737  * @adapter: board private structure
 738  *
 739  * Returns 0 on success, negative on failure
 740  **/
 741
 742 int
 743 ixgb_setup_rx_resources(struct ixgb_adapter *adapter)
 744 {
 745         struct ixgb_desc_ring *rxdr = &adapter->rx_ring;
 746         struct pci_dev *pdev = adapter->pdev;
 747         int size;
 748
 749         size = sizeof(struct ixgb_buffer) * rxdr->count;
 750         rxdr->buffer_info = vmalloc(size);
 751         if (!rxdr->buffer_info) {
 752                 DPRINTK(PROBE, ERR,
 753                  "Unable to allocate receive descriptor ring\n");
 754                 return -ENOMEM;
 755         }
 756         memset(rxdr->buffer_info, 0, size);
 757
 758         /* Round up to nearest 4K */
 759
 760         rxdr->size = rxdr->count * sizeof(struct ixgb_rx_desc);
 761         rxdr->size = ALIGN(rxdr->size, 4096);
 762
 763         rxdr->desc = pci_alloc_consistent(pdev, rxdr->size, &rxdr->dma);
 764
 765         if (!rxdr->desc) {
 766                 vfree(rxdr->buffer_info);
 767                 DPRINTK(PROBE, ERR,
 768                  "Unable to allocate receive descriptors\n");
 769                 return -ENOMEM;
 770         }
 771         memset(rxdr->desc, 0, rxdr->size);
 772
 773         rxdr->next_to_clean = 0;
 774         rxdr->next_to_use = 0;
 775
 776         return 0;
 777 }
 778
 779 /**
 780  * ixgb_setup_rctl - configure the receive control register
 781  * @adapter: Board private structure
 782  **/
 783
 784 static void
 785 ixgb_setup_rctl(struct ixgb_adapter *adapter)
 786 {
 787         u32 rctl;
 788
 789         rctl = IXGB_READ_REG(&adapter->hw, RCTL);
 790
 791         rctl &= ~(3 << IXGB_RCTL_MO_SHIFT);
 792
 793         rctl |=
 794                 IXGB_RCTL_BAM | IXGB_RCTL_RDMTS_1_2 |
 795                 IXGB_RCTL_RXEN | IXGB_RCTL_CFF |
 796                 (adapter->hw.mc_filter_type << IXGB_RCTL_MO_SHIFT);
 797
 798         rctl |= IXGB_RCTL_SECRC;
 799
 800         if (adapter->rx_buffer_len <= IXGB_RXBUFFER_2048)
 801                 rctl |= IXGB_RCTL_BSIZE_2048;
 802         else if (adapter->rx_buffer_len <= IXGB_RXBUFFER_4096)
 803                 rctl |= IXGB_RCTL_BSIZE_4096;
 804         else if (adapter->rx_buffer_len <= IXGB_RXBUFFER_8192)
 805                 rctl |= IXGB_RCTL_BSIZE_8192;
 806         else if (adapter->rx_buffer_len <= IXGB_RXBUFFER_16384)
 807                 rctl |= IXGB_RCTL_BSIZE_16384;
 808
 809         IXGB_WRITE_REG(&adapter->hw, RCTL, rctl);
 810 }
 811
 812 /**
 813  * ixgb_configure_rx - Configure 82597 Receive Unit after Reset.
 814  * @adapter: board private structure
 815  *
 816  * Configure the Rx unit of the MAC after a reset.
 817  **/
 818
 819 static void
 820 ixgb_configure_rx(struct ixgb_adapter *adapter)
 821 {
 822         u64 rdba = adapter->rx_ring.dma;
 823         u32 rdlen = adapter->rx_ring.count * sizeof(struct ixgb_rx_desc);
 824         struct ixgb_hw *hw = &adapter->hw;
 825         u32 rctl;
 826         u32 rxcsum;
 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         /* due to the hardware errata with RXDCTL, we are unable to use any of
 849          * the performance enhancing features of it without causing other
 850          * subtle bugs, some of the bugs could include receive length
 851          * corruption at high data rates (WTHRESH > 0) and/or receive
 852          * descriptor ring irregularites (particularly in hardware cache) */
 853         IXGB_WRITE_REG(hw, RXDCTL, 0);
 854
 855         /* Enable Receive Checksum Offload for TCP and UDP */
 856         if (adapter->rx_csum) {
 857                 rxcsum = IXGB_READ_REG(hw, RXCSUM);
 858                 rxcsum |= IXGB_RXCSUM_TUOFL;
 859                 IXGB_WRITE_REG(hw, RXCSUM, rxcsum);
 860         }
 861
 862         /* Enable Receives */
 863
 864         IXGB_WRITE_REG(hw, RCTL, rctl);
 865 }
 866
 867 /**
 868  * ixgb_free_tx_resources - Free Tx Resources
 869  * @adapter: board private structure
 870  *
 871  * Free all transmit software resources
 872  **/
 873
 874 void
 875 ixgb_free_tx_resources(struct ixgb_adapter *adapter)
 876 {
 877         struct pci_dev *pdev = adapter->pdev;
 878
 879         ixgb_clean_tx_ring(adapter);
 880
 881         vfree(adapter->tx_ring.buffer_info);
 882         adapter->tx_ring.buffer_info = NULL;
 883
 884         pci_free_consistent(pdev, adapter->tx_ring.size,
 885                             adapter->tx_ring.desc, adapter->tx_ring.dma);
 886
 887         adapter->tx_ring.desc = NULL;
 888 }
 889
 890 static void
 891 ixgb_unmap_and_free_tx_resource(struct ixgb_adapter *adapter,
 892                                 struct ixgb_buffer *buffer_info)
 893 {
 894         struct pci_dev *pdev = adapter->pdev;
 895
 896         if (buffer_info->dma)
 897                 pci_unmap_page(pdev, buffer_info->dma, buffer_info->length,
 898                                PCI_DMA_TODEVICE);
 899
 900         if (buffer_info->skb)
 901                 dev_kfree_skb_any(buffer_info->skb);
 902
 903         buffer_info->skb = NULL;
 904         buffer_info->dma = 0;
 905         buffer_info->time_stamp = 0;
 906         /* these fields must always be initialized in tx
 907          * buffer_info->length = 0;
 908          * buffer_info->next_to_watch = 0; */
 909 }
 910
 911 /**
 912  * ixgb_clean_tx_ring - Free Tx Buffers
 913  * @adapter: board private structure
 914  **/
 915
 916 static void
 917 ixgb_clean_tx_ring(struct ixgb_adapter *adapter)
 918 {
 919         struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
 920         struct ixgb_buffer *buffer_info;
 921         unsigned long size;
 922         unsigned int i;
 923
 924         /* Free all the Tx ring sk_buffs */
 925
 926         for (i = 0; i < tx_ring->count; i++) {
 927                 buffer_info = &tx_ring->buffer_info[i];
 928                 ixgb_unmap_and_free_tx_resource(adapter, buffer_info);
 929         }
 930
 931         size = sizeof(struct ixgb_buffer) * tx_ring->count;
 932         memset(tx_ring->buffer_info, 0, size);
 933
 934         /* Zero out the descriptor ring */
 935
 936         memset(tx_ring->desc, 0, tx_ring->size);
 937
 938         tx_ring->next_to_use = 0;
 939         tx_ring->next_to_clean = 0;
 940
 941         IXGB_WRITE_REG(&adapter->hw, TDH, 0);
 942         IXGB_WRITE_REG(&adapter->hw, TDT, 0);
 943 }
 944
 945 /**
 946  * ixgb_free_rx_resources - Free Rx Resources
 947  * @adapter: board private structure
 948  *
 949  * Free all receive software resources
 950  **/
 951
 952 void
 953 ixgb_free_rx_resources(struct ixgb_adapter *adapter)
 954 {
 955         struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
 956         struct pci_dev *pdev = adapter->pdev;
 957
 958         ixgb_clean_rx_ring(adapter);
 959
 960         vfree(rx_ring->buffer_info);
 961         rx_ring->buffer_info = NULL;
 962
 963         pci_free_consistent(pdev, rx_ring->size, rx_ring->desc, rx_ring->dma);
 964
 965         rx_ring->desc = NULL;
 966 }
 967
 968 /**
 969  * ixgb_clean_rx_ring - Free Rx Buffers
 970  * @adapter: board private structure
 971  **/
 972
 973 static void
 974 ixgb_clean_rx_ring(struct ixgb_adapter *adapter)
 975 {
 976         struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
 977         struct ixgb_buffer *buffer_info;
 978         struct pci_dev *pdev = adapter->pdev;
 979         unsigned long size;
 980         unsigned int i;
 981
 982         /* Free all the Rx ring sk_buffs */
 983
 984         for (i = 0; i < rx_ring->count; i++) {
 985                 buffer_info = &rx_ring->buffer_info[i];
 986                 if (buffer_info->skb) {
 987
 988                         pci_unmap_single(pdev,
 989                                          buffer_info->dma,
 990                                          buffer_info->length,
 991                                          PCI_DMA_FROMDEVICE);
 992
 993                         dev_kfree_skb(buffer_info->skb);
 994
 995                         buffer_info->skb = NULL;
 996                 }
 997         }
 998
 999         size = sizeof(struct ixgb_buffer) * rx_ring->count;
1000         memset(rx_ring->buffer_info, 0, size);
1001
1002         /* Zero out the descriptor ring */
1003
1004         memset(rx_ring->desc, 0, rx_ring->size);
1005
1006         rx_ring->next_to_clean = 0;
1007         rx_ring->next_to_use = 0;
1008
1009         IXGB_WRITE_REG(&adapter->hw, RDH, 0);
1010         IXGB_WRITE_REG(&adapter->hw, RDT, 0);
1011 }
1012
1013 /**
1014  * ixgb_set_mac - Change the Ethernet Address of the NIC
1015  * @netdev: network interface device structure
1016  * @p: pointer to an address structure
1017  *
1018  * Returns 0 on success, negative on failure
1019  **/
1020
1021 static int
1022 ixgb_set_mac(struct net_device *netdev, void *p)
1023 {
1024         struct ixgb_adapter *adapter = netdev_priv(netdev);
1025         struct sockaddr *addr = p;
1026
1027         if (!is_valid_ether_addr(addr->sa_data))
1028                 return -EADDRNOTAVAIL;
1029
1030         memcpy(netdev->dev_addr, addr->sa_data, netdev->addr_len);
1031
1032         ixgb_rar_set(&adapter->hw, addr->sa_data, 0);
1033
1034         return 0;
1035 }
1036
1037 /**
1038  * ixgb_set_multi - Multicast and Promiscuous mode set
1039  * @netdev: network interface device structure
1040  *
1041  * The set_multi entry point is called whenever the multicast address
1042  * list or the network interface flags are updated.  This routine is
1043  * responsible for configuring the hardware for proper multicast,
1044  * promiscuous mode, and all-multi behavior.
1045  **/
1046
1047 static void
1048 ixgb_set_multi(struct net_device *netdev)
1049 {
1050         struct ixgb_adapter *adapter = netdev_priv(netdev);
1051         struct ixgb_hw *hw = &adapter->hw;
1052         struct dev_mc_list *mc_ptr;
1053         u32 rctl;
1054         int i;
1055
1056         /* Check for Promiscuous and All Multicast modes */
1057
1058         rctl = IXGB_READ_REG(hw, RCTL);
1059
1060         if (netdev->flags & IFF_PROMISC) {
1061                 rctl |= (IXGB_RCTL_UPE | IXGB_RCTL_MPE);
1062         } else if (netdev->flags & IFF_ALLMULTI) {
1063                 rctl |= IXGB_RCTL_MPE;
1064                 rctl &= ~IXGB_RCTL_UPE;
1065         } else {
1066                 rctl &= ~(IXGB_RCTL_UPE | IXGB_RCTL_MPE);
1067         }
1068
1069         if (netdev->mc_count > IXGB_MAX_NUM_MULTICAST_ADDRESSES) {
1070                 rctl |= IXGB_RCTL_MPE;
1071                 IXGB_WRITE_REG(hw, RCTL, rctl);
1072         } else {
1073                 u8 mta[IXGB_MAX_NUM_MULTICAST_ADDRESSES *
1074                             IXGB_ETH_LENGTH_OF_ADDRESS];
1075
1076                 IXGB_WRITE_REG(hw, RCTL, rctl);
1077
1078                 for (i = 0, mc_ptr = netdev->mc_list;
1079                      mc_ptr;
1080                      i++, mc_ptr = mc_ptr->next)
1081                         memcpy(&mta[i * IXGB_ETH_LENGTH_OF_ADDRESS],
1082                                mc_ptr->dmi_addr, IXGB_ETH_LENGTH_OF_ADDRESS);
1083
1084                 ixgb_mc_addr_list_update(hw, mta, netdev->mc_count, 0);
1085         }
1086 }
1087
1088 /**
1089  * ixgb_watchdog - Timer Call-back
1090  * @data: pointer to netdev cast into an unsigned long
1091  **/
1092
1093 static void
1094 ixgb_watchdog(unsigned long data)
1095 {
1096         struct ixgb_adapter *adapter = (struct ixgb_adapter *)data;
1097         struct net_device *netdev = adapter->netdev;
1098         struct ixgb_desc_ring *txdr = &adapter->tx_ring;
1099
1100         ixgb_check_for_link(&adapter->hw);
1101
1102         if (ixgb_check_for_bad_link(&adapter->hw)) {
1103                 /* force the reset path */
1104                 netif_stop_queue(netdev);
1105         }
1106
1107         if (adapter->hw.link_up) {
1108                 if (!netif_carrier_ok(netdev)) {
1109                         DPRINTK(LINK, INFO,
1110                                 "NIC Link is Up 10000 Mbps Full Duplex\n");
1111                         adapter->link_speed = 10000;
1112                         adapter->link_duplex = FULL_DUPLEX;
1113                         netif_carrier_on(netdev);
1114                         netif_wake_queue(netdev);
1115                 }
1116         } else {
1117                 if (netif_carrier_ok(netdev)) {
1118                         adapter->link_speed = 0;
1119                         adapter->link_duplex = 0;
1120                         DPRINTK(LINK, INFO, "NIC Link is Down\n");
1121                         netif_carrier_off(netdev);
1122                         netif_stop_queue(netdev);
1123
1124                 }
1125         }
1126
1127         ixgb_update_stats(adapter);
1128
1129         if (!netif_carrier_ok(netdev)) {
1130                 if (IXGB_DESC_UNUSED(txdr) + 1 < txdr->count) {
1131                         /* We've lost link, so the controller stops DMA,
1132                          * but we've got queued Tx work that's never going
1133                          * to get done, so reset controller to flush Tx.
1134                          * (Do the reset outside of interrupt context). */
1135                         schedule_work(&adapter->tx_timeout_task);
1136                 }
1137         }
1138
1139         /* Force detection of hung controller every watchdog period */
1140         adapter->detect_tx_hung = true;
1141
1142         /* generate an interrupt to force clean up of any stragglers */
1143         IXGB_WRITE_REG(&adapter->hw, ICS, IXGB_INT_TXDW);
1144
1145         /* Reset the timer */
1146         mod_timer(&adapter->watchdog_timer, jiffies + 2 * HZ);
1147 }
1148
1149 #define IXGB_TX_FLAGS_CSUM              0x00000001
1150 #define IXGB_TX_FLAGS_VLAN              0x00000002
1151 #define IXGB_TX_FLAGS_TSO               0x00000004
1152
1153 static int
1154 ixgb_tso(struct ixgb_adapter *adapter, struct sk_buff *skb)
1155 {
1156         struct ixgb_context_desc *context_desc;
1157         unsigned int i;
1158         u8 ipcss, ipcso, tucss, tucso, hdr_len;
1159         u16 ipcse, tucse, mss;
1160         int err;
1161
1162         if (likely(skb_is_gso(skb))) {
1163                 struct ixgb_buffer *buffer_info;
1164                 struct iphdr *iph;
1165
1166                 if (skb_header_cloned(skb)) {
1167                         err = pskb_expand_head(skb, 0, 0, GFP_ATOMIC);
1168                         if (err)
1169                                 return err;
1170                 }
1171
1172                 hdr_len = skb_transport_offset(skb) + tcp_hdrlen(skb);
1173                 mss = skb_shinfo(skb)->gso_size;
1174                 iph = ip_hdr(skb);
1175                 iph->tot_len = 0;
1176                 iph->check = 0;
1177                 tcp_hdr(skb)->check = ~csum_tcpudp_magic(iph->saddr,
1178                                                          iph->daddr, 0,
1179                                                          IPPROTO_TCP, 0);
1180                 ipcss = skb_network_offset(skb);
1181                 ipcso = (void *)&(iph->check) - (void *)skb->data;
1182                 ipcse = skb_transport_offset(skb) - 1;
1183                 tucss = skb_transport_offset(skb);
1184                 tucso = (void *)&(tcp_hdr(skb)->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                 buffer_info = &adapter->tx_ring.buffer_info[i];
1190                 WARN_ON(buffer_info->dma != 0);
1191
1192                 context_desc->ipcss = ipcss;
1193                 context_desc->ipcso = ipcso;
1194                 context_desc->ipcse = cpu_to_le16(ipcse);
1195                 context_desc->tucss = tucss;
1196                 context_desc->tucso = tucso;
1197                 context_desc->tucse = cpu_to_le16(tucse);
1198                 context_desc->mss = cpu_to_le16(mss);
1199                 context_desc->hdr_len = hdr_len;
1200                 context_desc->status = 0;
1201                 context_desc->cmd_type_len = cpu_to_le32(
1202                                                   IXGB_CONTEXT_DESC_TYPE
1203                                                 | IXGB_CONTEXT_DESC_CMD_TSE
1204                                                 | IXGB_CONTEXT_DESC_CMD_IP
1205                                                 | IXGB_CONTEXT_DESC_CMD_TCP
1206                                                 | IXGB_CONTEXT_DESC_CMD_IDE
1207                                                 | (skb->len - (hdr_len)));
1208
1209
1210                 if (++i == adapter->tx_ring.count) i = 0;
1211                 adapter->tx_ring.next_to_use = i;
1212
1213                 return 1;
1214         }
1215
1216         return 0;
1217 }
1218
1219 static bool
1220 ixgb_tx_csum(struct ixgb_adapter *adapter, struct sk_buff *skb)
1221 {
1222         struct ixgb_context_desc *context_desc;
1223         unsigned int i;
1224         u8 css, cso;
1225
1226         if (likely(skb->ip_summed == CHECKSUM_PARTIAL)) {
1227                 struct ixgb_buffer *buffer_info;
1228                 css = skb_transport_offset(skb);
1229                 cso = css + skb->csum_offset;
1230
1231                 i = adapter->tx_ring.next_to_use;
1232                 context_desc = IXGB_CONTEXT_DESC(adapter->tx_ring, i);
1233                 buffer_info = &adapter->tx_ring.buffer_info[i];
1234                 WARN_ON(buffer_info->dma != 0);
1235
1236                 context_desc->tucss = css;
1237                 context_desc->tucso = cso;
1238                 context_desc->tucse = 0;
1239                 /* zero out any previously existing data in one instruction */
1240                 *(u32 *)&(context_desc->ipcss) = 0;
1241                 context_desc->status = 0;
1242                 context_desc->hdr_len = 0;
1243                 context_desc->mss = 0;
1244                 context_desc->cmd_type_len =
1245                         cpu_to_le32(IXGB_CONTEXT_DESC_TYPE
1246                                     | IXGB_TX_DESC_CMD_IDE);
1247
1248                 if (++i == adapter->tx_ring.count) i = 0;
1249                 adapter->tx_ring.next_to_use = i;
1250
1251                 return true;
1252         }
1253
1254         return false;
1255 }
1256
1257 #define IXGB_MAX_TXD_PWR        14
1258 #define IXGB_MAX_DATA_PER_TXD   (1<<IXGB_MAX_TXD_PWR)
1259
1260 static int
1261 ixgb_tx_map(struct ixgb_adapter *adapter, struct sk_buff *skb,
1262             unsigned int first)
1263 {
1264         struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
1265         struct ixgb_buffer *buffer_info;
1266         int len = skb->len;
1267         unsigned int offset = 0, size, count = 0, i;
1268         unsigned int mss = skb_shinfo(skb)->gso_size;
1269
1270         unsigned int nr_frags = skb_shinfo(skb)->nr_frags;
1271         unsigned int f;
1272
1273         len -= skb->data_len;
1274
1275         i = tx_ring->next_to_use;
1276
1277         while (len) {
1278                 buffer_info = &tx_ring->buffer_info[i];
1279                 size = min(len, IXGB_MAX_DATA_PER_TXD);
1280                 /* Workaround for premature desc write-backs
1281                  * in TSO mode.  Append 4-byte sentinel desc */
1282                 if (unlikely(mss && !nr_frags && size == len && size > 8))
1283                         size -= 4;
1284
1285                 buffer_info->length = size;
1286                 WARN_ON(buffer_info->dma != 0);
1287                 buffer_info->time_stamp = jiffies;
1288                 buffer_info->dma =
1289                         pci_map_single(adapter->pdev,
1290                                 skb->data + offset,
1291                                 size,
1292                                 PCI_DMA_TODEVICE);
1293                 buffer_info->next_to_watch = 0;
1294
1295                 len -= size;
1296                 offset += size;
1297                 count++;
1298                 if (++i == tx_ring->count) i = 0;
1299         }
1300
1301         for (f = 0; f < nr_frags; f++) {
1302                 struct skb_frag_struct *frag;
1303
1304                 frag = &skb_shinfo(skb)->frags[f];
1305                 len = frag->size;
1306                 offset = 0;
1307
1308                 while (len) {
1309                         buffer_info = &tx_ring->buffer_info[i];
1310                         size = min(len, IXGB_MAX_DATA_PER_TXD);
1311
1312                         /* Workaround for premature desc write-backs
1313                          * in TSO mode.  Append 4-byte sentinel desc */
1314                         if (unlikely(mss && (f == (nr_frags - 1))
1315                                      && size == len && size > 8))
1316                                 size -= 4;
1317
1318                         buffer_info->length = size;
1319                         buffer_info->time_stamp = jiffies;
1320                         buffer_info->dma =
1321                                 pci_map_page(adapter->pdev,
1322                                         frag->page,
1323                                         frag->page_offset + offset,
1324                                         size,
1325                                         PCI_DMA_TODEVICE);
1326                         buffer_info->next_to_watch = 0;
1327
1328                         len -= size;
1329                         offset += size;
1330                         count++;
1331                         if (++i == tx_ring->count) i = 0;
1332                 }
1333         }
1334         i = (i == 0) ? tx_ring->count - 1 : i - 1;
1335         tx_ring->buffer_info[i].skb = skb;
1336         tx_ring->buffer_info[first].next_to_watch = i;
1337
1338         return count;
1339 }
1340
1341 static void
1342 ixgb_tx_queue(struct ixgb_adapter *adapter, int count, int vlan_id,int tx_flags)
1343 {
1344         struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
1345         struct ixgb_tx_desc *tx_desc = NULL;
1346         struct ixgb_buffer *buffer_info;
1347         u32 cmd_type_len = adapter->tx_cmd_type;
1348         u8 status = 0;
1349         u8 popts = 0;
1350         unsigned int i;
1351
1352         if (tx_flags & IXGB_TX_FLAGS_TSO) {
1353                 cmd_type_len |= IXGB_TX_DESC_CMD_TSE;
1354                 popts |= (IXGB_TX_DESC_POPTS_IXSM | IXGB_TX_DESC_POPTS_TXSM);
1355         }
1356
1357         if (tx_flags & IXGB_TX_FLAGS_CSUM)
1358                 popts |= IXGB_TX_DESC_POPTS_TXSM;
1359
1360         if (tx_flags & IXGB_TX_FLAGS_VLAN)
1361                 cmd_type_len |= IXGB_TX_DESC_CMD_VLE;
1362
1363         i = tx_ring->next_to_use;
1364
1365         while (count--) {
1366                 buffer_info = &tx_ring->buffer_info[i];
1367                 tx_desc = IXGB_TX_DESC(*tx_ring, i);
1368                 tx_desc->buff_addr = cpu_to_le64(buffer_info->dma);
1369                 tx_desc->cmd_type_len =
1370                         cpu_to_le32(cmd_type_len | buffer_info->length);
1371                 tx_desc->status = status;
1372                 tx_desc->popts = popts;
1373                 tx_desc->vlan = cpu_to_le16(vlan_id);
1374
1375                 if (++i == tx_ring->count) i = 0;
1376         }
1377
1378         tx_desc->cmd_type_len |=
1379                 cpu_to_le32(IXGB_TX_DESC_CMD_EOP | IXGB_TX_DESC_CMD_RS);
1380
1381         /* Force memory writes to complete before letting h/w
1382          * know there are new descriptors to fetch.  (Only
1383          * applicable for weak-ordered memory model archs,
1384          * such as IA-64). */
1385         wmb();
1386
1387         tx_ring->next_to_use = i;
1388         IXGB_WRITE_REG(&adapter->hw, TDT, i);
1389 }
1390
1391 static int __ixgb_maybe_stop_tx(struct net_device *netdev, int size)
1392 {
1393         struct ixgb_adapter *adapter = netdev_priv(netdev);
1394         struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
1395
1396         netif_stop_queue(netdev);
1397         /* Herbert's original patch had:
1398          *  smp_mb__after_netif_stop_queue();
1399          * but since that doesn't exist yet, just open code it. */
1400         smp_mb();
1401
1402         /* We need to check again in a case another CPU has just
1403          * made room available. */
1404         if (likely(IXGB_DESC_UNUSED(tx_ring) < size))
1405                 return -EBUSY;
1406
1407         /* A reprieve! */
1408         netif_start_queue(netdev);
1409         ++adapter->restart_queue;
1410         return 0;
1411 }
1412
1413 static int ixgb_maybe_stop_tx(struct net_device *netdev,
1414                               struct ixgb_desc_ring *tx_ring, int size)
1415 {
1416         if (likely(IXGB_DESC_UNUSED(tx_ring) >= size))
1417                 return 0;
1418         return __ixgb_maybe_stop_tx(netdev, size);
1419 }
1420
1421
1422 /* Tx Descriptors needed, worst case */
1423 #define TXD_USE_COUNT(S) (((S) >> IXGB_MAX_TXD_PWR) + \
1424                          (((S) & (IXGB_MAX_DATA_PER_TXD - 1)) ? 1 : 0))
1425 #define DESC_NEEDED TXD_USE_COUNT(IXGB_MAX_DATA_PER_TXD) /* skb->date */ + \
1426         MAX_SKB_FRAGS * TXD_USE_COUNT(PAGE_SIZE) + 1 /* for context */ \
1427         + 1 /* one more needed for sentinel TSO workaround */
1428
1429 static int
1430 ixgb_xmit_frame(struct sk_buff *skb, struct net_device *netdev)
1431 {
1432         struct ixgb_adapter *adapter = netdev_priv(netdev);
1433         unsigned int first;
1434         unsigned int tx_flags = 0;
1435         int vlan_id = 0;
1436         int tso;
1437
1438         if (test_bit(__IXGB_DOWN, &adapter->flags)) {
1439                 dev_kfree_skb(skb);
1440                 return NETDEV_TX_OK;
1441         }
1442
1443         if (skb->len <= 0) {
1444                 dev_kfree_skb_any(skb);
1445                 return 0;
1446         }
1447
1448         if (unlikely(ixgb_maybe_stop_tx(netdev, &adapter->tx_ring,
1449                      DESC_NEEDED)))
1450                 return NETDEV_TX_BUSY;
1451
1452         if (adapter->vlgrp && vlan_tx_tag_present(skb)) {
1453                 tx_flags |= IXGB_TX_FLAGS_VLAN;
1454                 vlan_id = vlan_tx_tag_get(skb);
1455         }
1456
1457         first = adapter->tx_ring.next_to_use;
1458
1459         tso = ixgb_tso(adapter, skb);
1460         if (tso < 0) {
1461                 dev_kfree_skb_any(skb);
1462                 return NETDEV_TX_OK;
1463         }
1464
1465         if (likely(tso))
1466                 tx_flags |= IXGB_TX_FLAGS_TSO;
1467         else if (ixgb_tx_csum(adapter, skb))
1468                 tx_flags |= IXGB_TX_FLAGS_CSUM;
1469
1470         ixgb_tx_queue(adapter, ixgb_tx_map(adapter, skb, first), vlan_id,
1471                         tx_flags);
1472
1473         netdev->trans_start = jiffies;
1474
1475         /* Make sure there is space in the ring for the next send. */
1476         ixgb_maybe_stop_tx(netdev, &adapter->tx_ring, DESC_NEEDED);
1477
1478         return NETDEV_TX_OK;
1479 }
1480
1481 /**
1482  * ixgb_tx_timeout - Respond to a Tx Hang
1483  * @netdev: network interface device structure
1484  **/
1485
1486 static void
1487 ixgb_tx_timeout(struct net_device *netdev)
1488 {
1489         struct ixgb_adapter *adapter = netdev_priv(netdev);
1490
1491         /* Do the reset outside of interrupt context */
1492         schedule_work(&adapter->tx_timeout_task);
1493 }
1494
1495 static void
1496 ixgb_tx_timeout_task(struct work_struct *work)
1497 {
1498         struct ixgb_adapter *adapter =
1499                 container_of(work, struct ixgb_adapter, tx_timeout_task);
1500
1501         adapter->tx_timeout_count++;
1502         ixgb_down(adapter, true);
1503         ixgb_up(adapter);
1504 }
1505
1506 /**
1507  * ixgb_get_stats - Get System Network Statistics
1508  * @netdev: network interface device structure
1509  *
1510  * Returns the address of the device statistics structure.
1511  * The statistics are actually updated from the timer callback.
1512  **/
1513
1514 static struct net_device_stats *
1515 ixgb_get_stats(struct net_device *netdev)
1516 {
1517         struct ixgb_adapter *adapter = netdev_priv(netdev);
1518
1519         return &adapter->net_stats;
1520 }
1521
1522 /**
1523  * ixgb_change_mtu - Change the Maximum Transfer Unit
1524  * @netdev: network interface device structure
1525  * @new_mtu: new value for maximum frame size
1526  *
1527  * Returns 0 on success, negative on failure
1528  **/
1529
1530 static int
1531 ixgb_change_mtu(struct net_device *netdev, int new_mtu)
1532 {
1533         struct ixgb_adapter *adapter = netdev_priv(netdev);
1534         int max_frame = new_mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;
1535         int old_max_frame = netdev->mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;
1536
1537         /* MTU < 68 is an error for IPv4 traffic, just don't allow it */
1538         if ((new_mtu < 68) ||
1539             (max_frame > IXGB_MAX_JUMBO_FRAME_SIZE + ENET_FCS_LENGTH)) {
1540                 DPRINTK(PROBE, ERR, "Invalid MTU setting %d\n", new_mtu);
1541                 return -EINVAL;
1542         }
1543
1544         if (old_max_frame == max_frame)
1545                 return 0;
1546
1547         if (netif_running(netdev))
1548                 ixgb_down(adapter, true);
1549
1550         adapter->rx_buffer_len = max_frame + 8; /* + 8 for errata */
1551
1552         netdev->mtu = new_mtu;
1553
1554         if (netif_running(netdev))
1555                 ixgb_up(adapter);
1556
1557         return 0;
1558 }
1559
1560 /**
1561  * ixgb_update_stats - Update the board statistics counters.
1562  * @adapter: board private structure
1563  **/
1564
1565 void
1566 ixgb_update_stats(struct ixgb_adapter *adapter)
1567 {
1568         struct net_device *netdev = adapter->netdev;
1569         struct pci_dev *pdev = adapter->pdev;
1570
1571         /* Prevent stats update while adapter is being reset */
1572         if (pci_channel_offline(pdev))
1573                 return;
1574
1575         if ((netdev->flags & IFF_PROMISC) || (netdev->flags & IFF_ALLMULTI) ||
1576            (netdev->mc_count > IXGB_MAX_NUM_MULTICAST_ADDRESSES)) {
1577                 u64 multi = IXGB_READ_REG(&adapter->hw, MPRCL);
1578                 u32 bcast_l = IXGB_READ_REG(&adapter->hw, BPRCL);
1579                 u32 bcast_h = IXGB_READ_REG(&adapter->hw, BPRCH);
1580                 u64 bcast = ((u64)bcast_h << 32) | bcast_l;
1581
1582                 multi |= ((u64)IXGB_READ_REG(&adapter->hw, MPRCH) << 32);
1583                 /* fix up multicast stats by removing broadcasts */
1584                 if (multi >= bcast)
1585                         multi -= bcast;
1586
1587                 adapter->stats.mprcl += (multi & 0xFFFFFFFF);
1588                 adapter->stats.mprch += (multi >> 32);
1589                 adapter->stats.bprcl += bcast_l;
1590                 adapter->stats.bprch += bcast_h;
1591         } else {
1592                 adapter->stats.mprcl += IXGB_READ_REG(&adapter->hw, MPRCL);
1593                 adapter->stats.mprch += IXGB_READ_REG(&adapter->hw, MPRCH);
1594                 adapter->stats.bprcl += IXGB_READ_REG(&adapter->hw, BPRCL);
1595                 adapter->stats.bprch += IXGB_READ_REG(&adapter->hw, BPRCH);
1596         }
1597         adapter->stats.tprl += IXGB_READ_REG(&adapter->hw, TPRL);
1598         adapter->stats.tprh += IXGB_READ_REG(&adapter->hw, TPRH);
1599         adapter->stats.gprcl += IXGB_READ_REG(&adapter->hw, GPRCL);
1600         adapter->stats.gprch += IXGB_READ_REG(&adapter->hw, GPRCH);
1601         adapter->stats.uprcl += IXGB_READ_REG(&adapter->hw, UPRCL);
1602         adapter->stats.uprch += IXGB_READ_REG(&adapter->hw, UPRCH);
1603         adapter->stats.vprcl += IXGB_READ_REG(&adapter->hw, VPRCL);
1604         adapter->stats.vprch += IXGB_READ_REG(&adapter->hw, VPRCH);
1605         adapter->stats.jprcl += IXGB_READ_REG(&adapter->hw, JPRCL);
1606         adapter->stats.jprch += IXGB_READ_REG(&adapter->hw, JPRCH);
1607         adapter->stats.gorcl += IXGB_READ_REG(&adapter->hw, GORCL);
1608         adapter->stats.gorch += IXGB_READ_REG(&adapter->hw, GORCH);
1609         adapter->stats.torl += IXGB_READ_REG(&adapter->hw, TORL);
1610         adapter->stats.torh += IXGB_READ_REG(&adapter->hw, TORH);
1611         adapter->stats.rnbc += IXGB_READ_REG(&adapter->hw, RNBC);
1612         adapter->stats.ruc += IXGB_READ_REG(&adapter->hw, RUC);
1613         adapter->stats.roc += IXGB_READ_REG(&adapter->hw, ROC);
1614         adapter->stats.rlec += IXGB_READ_REG(&adapter->hw, RLEC);
1615         adapter->stats.crcerrs += IXGB_READ_REG(&adapter->hw, CRCERRS);
1616         adapter->stats.icbc += IXGB_READ_REG(&adapter->hw, ICBC);
1617         adapter->stats.ecbc += IXGB_READ_REG(&adapter->hw, ECBC);
1618         adapter->stats.mpc += IXGB_READ_REG(&adapter->hw, MPC);
1619         adapter->stats.tptl += IXGB_READ_REG(&adapter->hw, TPTL);
1620         adapter->stats.tpth += IXGB_READ_REG(&adapter->hw, TPTH);
1621         adapter->stats.gptcl += IXGB_READ_REG(&adapter->hw, GPTCL);
1622         adapter->stats.gptch += IXGB_READ_REG(&adapter->hw, GPTCH);
1623         adapter->stats.bptcl += IXGB_READ_REG(&adapter->hw, BPTCL);
1624         adapter->stats.bptch += IXGB_READ_REG(&adapter->hw, BPTCH);
1625         adapter->stats.mptcl += IXGB_READ_REG(&adapter->hw, MPTCL);
1626         adapter->stats.mptch += IXGB_READ_REG(&adapter->hw, MPTCH);
1627         adapter->stats.uptcl += IXGB_READ_REG(&adapter->hw, UPTCL);
1628         adapter->stats.uptch += IXGB_READ_REG(&adapter->hw, UPTCH);
1629         adapter->stats.vptcl += IXGB_READ_REG(&adapter->hw, VPTCL);
1630         adapter->stats.vptch += IXGB_READ_REG(&adapter->hw, VPTCH);
1631         adapter->stats.jptcl += IXGB_READ_REG(&adapter->hw, JPTCL);
1632         adapter->stats.jptch += IXGB_READ_REG(&adapter->hw, JPTCH);
1633         adapter->stats.gotcl += IXGB_READ_REG(&adapter->hw, GOTCL);
1634         adapter->stats.gotch += IXGB_READ_REG(&adapter->hw, GOTCH);
1635         adapter->stats.totl += IXGB_READ_REG(&adapter->hw, TOTL);
1636         adapter->stats.toth += IXGB_READ_REG(&adapter->hw, TOTH);
1637         adapter->stats.dc += IXGB_READ_REG(&adapter->hw, DC);
1638         adapter->stats.plt64c += IXGB_READ_REG(&adapter->hw, PLT64C);
1639         adapter->stats.tsctc += IXGB_READ_REG(&adapter->hw, TSCTC);
1640         adapter->stats.tsctfc += IXGB_READ_REG(&adapter->hw, TSCTFC);
1641         adapter->stats.ibic += IXGB_READ_REG(&adapter->hw, IBIC);
1642         adapter->stats.rfc += IXGB_READ_REG(&adapter->hw, RFC);
1643         adapter->stats.lfc += IXGB_READ_REG(&adapter->hw, LFC);
1644         adapter->stats.pfrc += IXGB_READ_REG(&adapter->hw, PFRC);
1645         adapter->stats.pftc += IXGB_READ_REG(&adapter->hw, PFTC);
1646         adapter->stats.mcfrc += IXGB_READ_REG(&adapter->hw, MCFRC);
1647         adapter->stats.mcftc += IXGB_READ_REG(&adapter->hw, MCFTC);
1648         adapter->stats.xonrxc += IXGB_READ_REG(&adapter->hw, XONRXC);
1649         adapter->stats.xontxc += IXGB_READ_REG(&adapter->hw, XONTXC);
1650         adapter->stats.xoffrxc += IXGB_READ_REG(&adapter->hw, XOFFRXC);
1651         adapter->stats.xofftxc += IXGB_READ_REG(&adapter->hw, XOFFTXC);
1652         adapter->stats.rjc += IXGB_READ_REG(&adapter->hw, RJC);
1653
1654         /* Fill out the OS statistics structure */
1655
1656         adapter->net_stats.rx_packets = adapter->stats.gprcl;
1657         adapter->net_stats.tx_packets = adapter->stats.gptcl;
1658         adapter->net_stats.rx_bytes = adapter->stats.gorcl;
1659         adapter->net_stats.tx_bytes = adapter->stats.gotcl;
1660         adapter->net_stats.multicast = adapter->stats.mprcl;
1661         adapter->net_stats.collisions = 0;
1662
1663         /* ignore RLEC as it reports errors for padded (<64bytes) frames
1664          * with a length in the type/len field */
1665         adapter->net_stats.rx_errors =
1666             /* adapter->stats.rnbc + */ adapter->stats.crcerrs +
1667             adapter->stats.ruc +
1668             adapter->stats.roc /*+ adapter->stats.rlec */  +
1669             adapter->stats.icbc +
1670             adapter->stats.ecbc + adapter->stats.mpc;
1671
1672         /* see above
1673          * adapter->net_stats.rx_length_errors = adapter->stats.rlec;
1674          */
1675
1676         adapter->net_stats.rx_crc_errors = adapter->stats.crcerrs;
1677         adapter->net_stats.rx_fifo_errors = adapter->stats.mpc;
1678         adapter->net_stats.rx_missed_errors = adapter->stats.mpc;
1679         adapter->net_stats.rx_over_errors = adapter->stats.mpc;
1680
1681         adapter->net_stats.tx_errors = 0;
1682         adapter->net_stats.rx_frame_errors = 0;
1683         adapter->net_stats.tx_aborted_errors = 0;
1684         adapter->net_stats.tx_carrier_errors = 0;
1685         adapter->net_stats.tx_fifo_errors = 0;
1686         adapter->net_stats.tx_heartbeat_errors = 0;
1687         adapter->net_stats.tx_window_errors = 0;
1688 }
1689
1690 #define IXGB_MAX_INTR 10
1691 /**
1692  * ixgb_intr - Interrupt Handler
1693  * @irq: interrupt number
1694  * @data: pointer to a network interface device structure
1695  **/
1696
1697 static irqreturn_t
1698 ixgb_intr(int irq, void *data)
1699 {
1700         struct net_device *netdev = data;
1701         struct ixgb_adapter *adapter = netdev_priv(netdev);
1702         struct ixgb_hw *hw = &adapter->hw;
1703         u32 icr = IXGB_READ_REG(hw, ICR);
1704 #ifndef CONFIG_IXGB_NAPI
1705         unsigned int i;
1706 #endif
1707
1708         if (unlikely(!icr))
1709                 return IRQ_NONE;  /* Not our interrupt */
1710
1711         if (unlikely(icr & (IXGB_INT_RXSEQ | IXGB_INT_LSC)))
1712                 if (!test_bit(__IXGB_DOWN, &adapter->flags))
1713                         mod_timer(&adapter->watchdog_timer, jiffies);
1714
1715 #ifdef CONFIG_IXGB_NAPI
1716         if (netif_rx_schedule_prep(netdev, &adapter->napi)) {
1717
1718                 /* Disable interrupts and register for poll. The flush
1719                   of the posted write is intentionally left out.
1720                 */
1721
1722                 IXGB_WRITE_REG(&adapter->hw, IMC, ~0);
1723                 __netif_rx_schedule(netdev, &adapter->napi);
1724         }
1725 #else
1726         /* yes, that is actually a & and it is meant to make sure that
1727          * every pass through this for loop checks both receive and
1728          * transmit queues for completed descriptors, intended to
1729          * avoid starvation issues and assist tx/rx fairness. */
1730         for (i = 0; i < IXGB_MAX_INTR; i++)
1731                 if (!ixgb_clean_rx_irq(adapter) &
1732                    !ixgb_clean_tx_irq(adapter))
1733                         break;
1734 #endif
1735         return IRQ_HANDLED;
1736 }
1737
1738 #ifdef CONFIG_IXGB_NAPI
1739 /**
1740  * ixgb_clean - NAPI Rx polling callback
1741  * @adapter: board private structure
1742  **/
1743
1744 static int
1745 ixgb_clean(struct napi_struct *napi, int budget)
1746 {
1747         struct ixgb_adapter *adapter = container_of(napi, struct ixgb_adapter, napi);
1748         struct net_device *netdev = adapter->netdev;
1749         int work_done = 0;
1750
1751         ixgb_clean_tx_irq(adapter);
1752         ixgb_clean_rx_irq(adapter, &work_done, budget);
1753
1754         /* If budget not fully consumed, exit the polling mode */
1755         if (work_done < budget) {
1756                 netif_rx_complete(netdev, napi);
1757                 if (!test_bit(__IXGB_DOWN, &adapter->flags))
1758                         ixgb_irq_enable(adapter);
1759         }
1760
1761         return work_done;
1762 }
1763 #endif
1764
1765 /**
1766  * ixgb_clean_tx_irq - Reclaim resources after transmit completes
1767  * @adapter: board private structure
1768  **/
1769
1770 static bool
1771 ixgb_clean_tx_irq(struct ixgb_adapter *adapter)
1772 {
1773         struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
1774         struct net_device *netdev = adapter->netdev;
1775         struct ixgb_tx_desc *tx_desc, *eop_desc;
1776         struct ixgb_buffer *buffer_info;
1777         unsigned int i, eop;
1778         bool cleaned = false;
1779
1780         i = tx_ring->next_to_clean;
1781         eop = tx_ring->buffer_info[i].next_to_watch;
1782         eop_desc = IXGB_TX_DESC(*tx_ring, eop);
1783
1784         while (eop_desc->status & IXGB_TX_DESC_STATUS_DD) {
1785
1786                 for (cleaned = false; !cleaned; ) {
1787                         tx_desc = IXGB_TX_DESC(*tx_ring, i);
1788                         buffer_info = &tx_ring->buffer_info[i];
1789
1790                         if (tx_desc->popts &
1791                            (IXGB_TX_DESC_POPTS_TXSM |
1792                             IXGB_TX_DESC_POPTS_IXSM))
1793                                 adapter->hw_csum_tx_good++;
1794
1795                         ixgb_unmap_and_free_tx_resource(adapter, buffer_info);
1796
1797                         *(u32 *)&(tx_desc->status) = 0;
1798
1799                         cleaned = (i == eop);
1800                         if (++i == tx_ring->count) i = 0;
1801                 }
1802
1803                 eop = tx_ring->buffer_info[i].next_to_watch;
1804                 eop_desc = IXGB_TX_DESC(*tx_ring, eop);
1805         }
1806
1807         tx_ring->next_to_clean = i;
1808
1809         if (unlikely(cleaned && netif_carrier_ok(netdev) &&
1810                      IXGB_DESC_UNUSED(tx_ring) >= DESC_NEEDED)) {
1811                 /* Make sure that anybody stopping the queue after this
1812                  * sees the new next_to_clean. */
1813                 smp_mb();
1814
1815                 if (netif_queue_stopped(netdev) &&
1816                     !(test_bit(__IXGB_DOWN, &adapter->flags))) {
1817                         netif_wake_queue(netdev);
1818                         ++adapter->restart_queue;
1819                 }
1820         }
1821
1822         if (adapter->detect_tx_hung) {
1823                 /* detect a transmit hang in hardware, this serializes the
1824                  * check with the clearing of time_stamp and movement of i */
1825                 adapter->detect_tx_hung = false;
1826                 if (tx_ring->buffer_info[eop].dma &&
1827                    time_after(jiffies, tx_ring->buffer_info[eop].time_stamp + HZ)
1828                    && !(IXGB_READ_REG(&adapter->hw, STATUS) &
1829                         IXGB_STATUS_TXOFF)) {
1830                         /* detected Tx unit hang */
1831                         DPRINTK(DRV, ERR, "Detected Tx Unit Hang\n"
1832                                         "  TDH                  <%x>\n"
1833                                         "  TDT                  <%x>\n"
1834                                         "  next_to_use          <%x>\n"
1835                                         "  next_to_clean        <%x>\n"
1836                                         "buffer_info[next_to_clean]\n"
1837                                         "  time_stamp           <%lx>\n"
1838                                         "  next_to_watch        <%x>\n"
1839                                         "  jiffies              <%lx>\n"
1840                                         "  next_to_watch.status <%x>\n",
1841                                 IXGB_READ_REG(&adapter->hw, TDH),
1842                                 IXGB_READ_REG(&adapter->hw, TDT),
1843                                 tx_ring->next_to_use,
1844                                 tx_ring->next_to_clean,
1845                                 tx_ring->buffer_info[eop].time_stamp,
1846                                 eop,
1847                                 jiffies,
1848                                 eop_desc->status);
1849                         netif_stop_queue(netdev);
1850                 }
1851         }
1852
1853         return cleaned;
1854 }
1855
1856 /**
1857  * ixgb_rx_checksum - Receive Checksum Offload for 82597.
1858  * @adapter: board private structure
1859  * @rx_desc: receive descriptor
1860  * @sk_buff: socket buffer with received data
1861  **/
1862
1863 static void
1864 ixgb_rx_checksum(struct ixgb_adapter *adapter,
1865                  struct ixgb_rx_desc *rx_desc,
1866                  struct sk_buff *skb)
1867 {
1868         /* Ignore Checksum bit is set OR
1869          * TCP Checksum has not been calculated
1870          */
1871         if ((rx_desc->status & IXGB_RX_DESC_STATUS_IXSM) ||
1872            (!(rx_desc->status & IXGB_RX_DESC_STATUS_TCPCS))) {
1873                 skb->ip_summed = CHECKSUM_NONE;
1874                 return;
1875         }
1876
1877         /* At this point we know the hardware did the TCP checksum */
1878         /* now look at the TCP checksum error bit */
1879         if (rx_desc->errors & IXGB_RX_DESC_ERRORS_TCPE) {
1880                 /* let the stack verify checksum errors */
1881                 skb->ip_summed = CHECKSUM_NONE;
1882                 adapter->hw_csum_rx_error++;
1883         } else {
1884                 /* TCP checksum is good */
1885                 skb->ip_summed = CHECKSUM_UNNECESSARY;
1886                 adapter->hw_csum_rx_good++;
1887         }
1888 }
1889
1890 /**
1891  * ixgb_clean_rx_irq - Send received data up the network stack,
1892  * @adapter: board private structure
1893  **/
1894
1895 static bool
1896 #ifdef CONFIG_IXGB_NAPI
1897 ixgb_clean_rx_irq(struct ixgb_adapter *adapter, int *work_done, int work_to_do)
1898 #else
1899 ixgb_clean_rx_irq(struct ixgb_adapter *adapter)
1900 #endif
1901 {
1902         struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
1903         struct net_device *netdev = adapter->netdev;
1904         struct pci_dev *pdev = adapter->pdev;
1905         struct ixgb_rx_desc *rx_desc, *next_rxd;
1906         struct ixgb_buffer *buffer_info, *next_buffer, *next2_buffer;
1907         u32 length;
1908         unsigned int i, j;
1909         bool cleaned = false;
1910
1911         i = rx_ring->next_to_clean;
1912         rx_desc = IXGB_RX_DESC(*rx_ring, i);
1913         buffer_info = &rx_ring->buffer_info[i];
1914
1915         while (rx_desc->status & IXGB_RX_DESC_STATUS_DD) {
1916                 struct sk_buff *skb, *next_skb;
1917                 u8 status;
1918
1919 #ifdef CONFIG_IXGB_NAPI
1920                 if (*work_done >= work_to_do)
1921                         break;
1922
1923                 (*work_done)++;
1924 #endif
1925                 status = rx_desc->status;
1926                 skb = buffer_info->skb;
1927                 buffer_info->skb = NULL;
1928
1929                 prefetch(skb->data);
1930
1931                 if (++i == rx_ring->count) i = 0;
1932                 next_rxd = IXGB_RX_DESC(*rx_ring, i);
1933                 prefetch(next_rxd);
1934
1935                 if ((j = i + 1) == rx_ring->count) j = 0;
1936                 next2_buffer = &rx_ring->buffer_info[j];
1937                 prefetch(next2_buffer);
1938
1939                 next_buffer = &rx_ring->buffer_info[i];
1940                 next_skb = next_buffer->skb;
1941                 prefetch(next_skb);
1942
1943                 cleaned = true;
1944
1945                 pci_unmap_single(pdev,
1946                                  buffer_info->dma,
1947                                  buffer_info->length,
1948                                  PCI_DMA_FROMDEVICE);
1949
1950                 length = le16_to_cpu(rx_desc->length);
1951
1952                 if (unlikely(!(status & IXGB_RX_DESC_STATUS_EOP))) {
1953
1954                         /* All receives must fit into a single buffer */
1955
1956                         IXGB_DBG("Receive packet consumed multiple buffers "
1957                                          "length<%x>\n", length);
1958
1959                         dev_kfree_skb_irq(skb);
1960                         goto rxdesc_done;
1961                 }
1962
1963                 if (unlikely(rx_desc->errors &
1964                     (IXGB_RX_DESC_ERRORS_CE | IXGB_RX_DESC_ERRORS_SE |
1965                      IXGB_RX_DESC_ERRORS_P | IXGB_RX_DESC_ERRORS_RXE))) {
1966                         dev_kfree_skb_irq(skb);
1967                         goto rxdesc_done;
1968                 }
1969
1970                 /* code added for copybreak, this should improve
1971                  * performance for small packets with large amounts
1972                  * of reassembly being done in the stack */
1973                 if (length < copybreak) {
1974                         struct sk_buff *new_skb =
1975                             netdev_alloc_skb(netdev, length + NET_IP_ALIGN);
1976                         if (new_skb) {
1977                                 skb_reserve(new_skb, NET_IP_ALIGN);
1978                                 skb_copy_to_linear_data_offset(new_skb,
1979                                                                -NET_IP_ALIGN,
1980                                                                (skb->data -
1981                                                                 NET_IP_ALIGN),
1982                                                                (length +
1983                                                                 NET_IP_ALIGN));
1984                                 /* save the skb in buffer_info as good */
1985                                 buffer_info->skb = skb;
1986                                 skb = new_skb;
1987                         }
1988                 }
1989                 /* end copybreak code */
1990
1991                 /* Good Receive */
1992                 skb_put(skb, length);
1993
1994                 /* Receive Checksum Offload */
1995                 ixgb_rx_checksum(adapter, rx_desc, skb);
1996
1997                 skb->protocol = eth_type_trans(skb, netdev);
1998 #ifdef CONFIG_IXGB_NAPI
1999                 if (adapter->vlgrp && (status & IXGB_RX_DESC_STATUS_VP)) {
2000                         vlan_hwaccel_receive_skb(skb, adapter->vlgrp,
2001                                                 le16_to_cpu(rx_desc->special));
2002                 } else {
2003                         netif_receive_skb(skb);
2004                 }
2005 #else /* CONFIG_IXGB_NAPI */
2006                 if (adapter->vlgrp && (status & IXGB_RX_DESC_STATUS_VP)) {
2007                         vlan_hwaccel_rx(skb, adapter->vlgrp,
2008                                         le16_to_cpu(rx_desc->special));
2009                 } else {
2010                         netif_rx(skb);
2011                 }
2012 #endif /* CONFIG_IXGB_NAPI */
2013                 netdev->last_rx = jiffies;
2014
2015 rxdesc_done:
2016                 /* clean up descriptor, might be written over by hw */
2017                 rx_desc->status = 0;
2018
2019                 /* use prefetched values */
2020                 rx_desc = next_rxd;
2021                 buffer_info = next_buffer;
2022         }
2023
2024         rx_ring->next_to_clean = i;
2025
2026         ixgb_alloc_rx_buffers(adapter);
2027
2028         return cleaned;
2029 }
2030
2031 /**
2032  * ixgb_alloc_rx_buffers - Replace used receive buffers
2033  * @adapter: address of board private structure
2034  **/
2035
2036 static void
2037 ixgb_alloc_rx_buffers(struct ixgb_adapter *adapter)
2038 {
2039         struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
2040         struct net_device *netdev = adapter->netdev;
2041         struct pci_dev *pdev = adapter->pdev;
2042         struct ixgb_rx_desc *rx_desc;
2043         struct ixgb_buffer *buffer_info;
2044         struct sk_buff *skb;
2045         unsigned int i;
2046         long cleancount;
2047
2048         i = rx_ring->next_to_use;
2049         buffer_info = &rx_ring->buffer_info[i];
2050         cleancount = IXGB_DESC_UNUSED(rx_ring);
2051
2052
2053         /* leave three descriptors unused */
2054         while (--cleancount > 2) {
2055                 /* recycle! its good for you */
2056                 skb = buffer_info->skb;
2057                 if (skb) {
2058                         skb_trim(skb, 0);
2059                         goto map_skb;
2060                 }
2061
2062                 skb = netdev_alloc_skb(netdev, adapter->rx_buffer_len
2063                                        + NET_IP_ALIGN);
2064                 if (unlikely(!skb)) {
2065                         /* Better luck next round */
2066                         adapter->alloc_rx_buff_failed++;
2067                         break;
2068                 }
2069
2070                 /* Make buffer alignment 2 beyond a 16 byte boundary
2071                  * this will result in a 16 byte aligned IP header after
2072                  * the 14 byte MAC header is removed
2073                  */
2074                 skb_reserve(skb, NET_IP_ALIGN);
2075
2076                 buffer_info->skb = skb;
2077                 buffer_info->length = adapter->rx_buffer_len;
2078 map_skb:
2079                 buffer_info->dma = pci_map_single(pdev,
2080                                                   skb->data,
2081                                                   adapter->rx_buffer_len,
2082                                                   PCI_DMA_FROMDEVICE);
2083
2084                 rx_desc = IXGB_RX_DESC(*rx_ring, i);
2085                 rx_desc->buff_addr = cpu_to_le64(buffer_info->dma);
2086                 /* guarantee DD bit not set now before h/w gets descriptor
2087                  * this is the rest of the workaround for h/w double
2088                  * writeback. */
2089                 rx_desc->status = 0;
2090
2091
2092                 if (++i == rx_ring->count) i = 0;
2093                 buffer_info = &rx_ring->buffer_info[i];
2094         }
2095
2096         if (likely(rx_ring->next_to_use != i)) {
2097                 rx_ring->next_to_use = i;
2098                 if (unlikely(i-- == 0))
2099                         i = (rx_ring->count - 1);
2100
2101                 /* Force memory writes to complete before letting h/w
2102                  * know there are new descriptors to fetch.  (Only
2103                  * applicable for weak-ordered memory model archs, such
2104                  * as IA-64). */
2105                 wmb();
2106                 IXGB_WRITE_REG(&adapter->hw, RDT, i);
2107         }
2108 }
2109
2110 /**
2111  * ixgb_vlan_rx_register - enables or disables vlan tagging/stripping.
2112  *
2113  * @param netdev network interface device structure
2114  * @param grp indicates to enable or disable tagging/stripping
2115  **/
2116 static void
2117 ixgb_vlan_rx_register(struct net_device *netdev, struct vlan_group *grp)
2118 {
2119         struct ixgb_adapter *adapter = netdev_priv(netdev);
2120         u32 ctrl, rctl;
2121
2122         ixgb_irq_disable(adapter);
2123         adapter->vlgrp = grp;
2124
2125         if (grp) {
2126                 /* enable VLAN tag insert/strip */
2127                 ctrl = IXGB_READ_REG(&adapter->hw, CTRL0);
2128                 ctrl |= IXGB_CTRL0_VME;
2129                 IXGB_WRITE_REG(&adapter->hw, CTRL0, ctrl);
2130
2131                 /* enable VLAN receive filtering */
2132
2133                 rctl = IXGB_READ_REG(&adapter->hw, RCTL);
2134                 rctl |= IXGB_RCTL_VFE;
2135                 rctl &= ~IXGB_RCTL_CFIEN;
2136                 IXGB_WRITE_REG(&adapter->hw, RCTL, rctl);
2137         } else {
2138                 /* disable VLAN tag insert/strip */
2139
2140                 ctrl = IXGB_READ_REG(&adapter->hw, CTRL0);
2141                 ctrl &= ~IXGB_CTRL0_VME;
2142                 IXGB_WRITE_REG(&adapter->hw, CTRL0, ctrl);
2143
2144                 /* disable VLAN filtering */
2145
2146                 rctl = IXGB_READ_REG(&adapter->hw, RCTL);
2147                 rctl &= ~IXGB_RCTL_VFE;
2148                 IXGB_WRITE_REG(&adapter->hw, RCTL, rctl);
2149         }
2150
2151         /* don't enable interrupts unless we are UP */
2152         if (adapter->netdev->flags & IFF_UP)
2153                 ixgb_irq_enable(adapter);
2154 }
2155
2156 static void
2157 ixgb_vlan_rx_add_vid(struct net_device *netdev, u16 vid)
2158 {
2159         struct ixgb_adapter *adapter = netdev_priv(netdev);
2160         u32 vfta, index;
2161
2162         /* add VID to filter table */
2163
2164         index = (vid >> 5) & 0x7F;
2165         vfta = IXGB_READ_REG_ARRAY(&adapter->hw, VFTA, index);
2166         vfta |= (1 << (vid & 0x1F));
2167         ixgb_write_vfta(&adapter->hw, index, vfta);
2168 }
2169
2170 static void
2171 ixgb_vlan_rx_kill_vid(struct net_device *netdev, u16 vid)
2172 {
2173         struct ixgb_adapter *adapter = netdev_priv(netdev);
2174         u32 vfta, index;
2175
2176         ixgb_irq_disable(adapter);
2177
2178         vlan_group_set_device(adapter->vlgrp, vid, NULL);
2179
2180         /* don't enable interrupts unless we are UP */
2181         if (adapter->netdev->flags & IFF_UP)
2182                 ixgb_irq_enable(adapter);
2183
2184         /* remove VID from filter table */
2185
2186         index = (vid >> 5) & 0x7F;
2187         vfta = IXGB_READ_REG_ARRAY(&adapter->hw, VFTA, index);
2188         vfta &= ~(1 << (vid & 0x1F));
2189         ixgb_write_vfta(&adapter->hw, index, vfta);
2190 }
2191
2192 static void
2193 ixgb_restore_vlan(struct ixgb_adapter *adapter)
2194 {
2195         ixgb_vlan_rx_register(adapter->netdev, adapter->vlgrp);
2196
2197         if (adapter->vlgrp) {
2198                 u16 vid;
2199                 for (vid = 0; vid < VLAN_GROUP_ARRAY_LEN; vid++) {
2200                         if (!vlan_group_get_device(adapter->vlgrp, vid))
2201                                 continue;
2202                         ixgb_vlan_rx_add_vid(adapter->netdev, vid);
2203                 }
2204         }
2205 }
2206
2207 #ifdef CONFIG_NET_POLL_CONTROLLER
2208 /*
2209  * Polling 'interrupt' - used by things like netconsole to send skbs
2210  * without having to re-enable interrupts. It's not called while
2211  * the interrupt routine is executing.
2212  */
2213
2214 static void ixgb_netpoll(struct net_device *dev)
2215 {
2216         struct ixgb_adapter *adapter = netdev_priv(dev);
2217
2218         disable_irq(adapter->pdev->irq);
2219         ixgb_intr(adapter->pdev->irq, dev);
2220         enable_irq(adapter->pdev->irq);
2221 }
2222 #endif
2223
2224 /**
2225  * ixgb_io_error_detected() - called when PCI error is detected
2226  * @pdev    pointer to pci device with error
2227  * @state   pci channel state after error
2228  *
2229  * This callback is called by the PCI subsystem whenever
2230  * a PCI bus error is detected.
2231  */
2232 static pci_ers_result_t ixgb_io_error_detected(struct pci_dev *pdev,
2233                                                enum pci_channel_state state)
2234 {
2235         struct net_device *netdev = pci_get_drvdata(pdev);
2236         struct ixgb_adapter *adapter = netdev_priv(netdev);
2237
2238         if (netif_running(netdev))
2239                 ixgb_down(adapter, true);
2240
2241         pci_disable_device(pdev);
2242
2243         /* Request a slot reset. */
2244         return PCI_ERS_RESULT_NEED_RESET;
2245 }
2246
2247 /**
2248  * ixgb_io_slot_reset - called after the pci bus has been reset.
2249  * @pdev    pointer to pci device with error
2250  *
2251  * This callback is called after the PCI bus has been reset.
2252  * Basically, this tries to restart the card from scratch.
2253  * This is a shortened version of the device probe/discovery code,
2254  * it resembles the first-half of the ixgb_probe() routine.
2255  */
2256 static pci_ers_result_t ixgb_io_slot_reset(struct pci_dev *pdev)
2257 {
2258         struct net_device *netdev = pci_get_drvdata(pdev);
2259         struct ixgb_adapter *adapter = netdev_priv(netdev);
2260
2261         if (pci_enable_device(pdev)) {
2262                 DPRINTK(PROBE, ERR, "Cannot re-enable PCI device after reset.\n");
2263                 return PCI_ERS_RESULT_DISCONNECT;
2264         }
2265
2266         /* Perform card reset only on one instance of the card */
2267         if (0 != PCI_FUNC (pdev->devfn))
2268                 return PCI_ERS_RESULT_RECOVERED;
2269
2270         pci_set_master(pdev);
2271
2272         netif_carrier_off(netdev);
2273         netif_stop_queue(netdev);
2274         ixgb_reset(adapter);
2275
2276         /* Make sure the EEPROM is good */
2277         if (!ixgb_validate_eeprom_checksum(&adapter->hw)) {
2278                 DPRINTK(PROBE, ERR, "After reset, the EEPROM checksum is not valid.\n");
2279                 return PCI_ERS_RESULT_DISCONNECT;
2280         }
2281         ixgb_get_ee_mac_addr(&adapter->hw, netdev->dev_addr);
2282         memcpy(netdev->perm_addr, netdev->dev_addr, netdev->addr_len);
2283
2284         if (!is_valid_ether_addr(netdev->perm_addr)) {
2285                 DPRINTK(PROBE, ERR, "After reset, invalid MAC address.\n");
2286                 return PCI_ERS_RESULT_DISCONNECT;
2287         }
2288
2289         return PCI_ERS_RESULT_RECOVERED;
2290 }
2291
2292 /**
2293  * ixgb_io_resume - called when its OK to resume normal operations
2294  * @pdev    pointer to pci device with error
2295  *
2296  * The error recovery driver tells us that its OK to resume
2297  * normal operation. Implementation resembles the second-half
2298  * of the ixgb_probe() routine.
2299  */
2300 static void ixgb_io_resume(struct pci_dev *pdev)
2301 {
2302         struct net_device *netdev = pci_get_drvdata(pdev);
2303         struct ixgb_adapter *adapter = netdev_priv(netdev);
2304
2305         pci_set_master(pdev);
2306
2307         if (netif_running(netdev)) {
2308                 if (ixgb_up(adapter)) {
2309                         printk ("ixgb: can't bring device back up after reset\n");
2310                         return;
2311                 }
2312         }
2313
2314         netif_device_attach(netdev);
2315         mod_timer(&adapter->watchdog_timer, jiffies);
2316 }
2317
2318 /* ixgb_main.c */