drivers/net/ixgb/ixgb_main.c

   1 /*******************************************************************************
   2
   3
   4   Copyright(c) 1999 - 2003 Intel Corporation. All rights reserved.
   5
   6   This program is free software; you can redistribute it and/or modify it
   7   under the terms of the GNU General Public License as published by the Free
   8   Software Foundation; either version 2 of the License, or (at your option)
   9   any later version.
  10
  11   This program is distributed in the hope that it will be useful, but WITHOUT
  12   ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13   FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  14   more details.
  15
  16   You should have received a copy of the GNU General Public License along with
  17   this program; if not, write to the Free Software Foundation, Inc., 59
  18   Temple Place - Suite 330, Boston, MA  02111-1307, USA.
  19
  20   The full GNU General Public License is included in this distribution in the
  21   file called LICENSE.
  22
  23   Contact Information:
  24   Linux NICS <linux.nics@intel.com>
  25   Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
  26 *******************************************************************************/
  27
  28 #define __IXGB_MAIN__
  29
  30 #include "ixgb.h"
  31
  32 char ixgb_driver_name[] = "ixgb";
  33 char ixgb_driver_string[] = "Intel(R) PRO/10GbE Network Driver";
  34 char ixgb_driver_version[] = "1.0.47-k1jg";
  35 char ixgb_copyright[] = "Copyright (c) 2001-2003 Intel Corporation.";
  36
  37 /* ixgb_pci_tbl - PCI Device ID Table
  38  *
  39  * For selecting devices to load on private driver_data field (last one)
  40  * stores an index into ixgb_strings.
  41  * Wildcard entries (PCI_ANY_ID) should come last
  42  * Last entry must be all 0s
  43  *
  44  * { Vendor ID, Device ID, SubVendor ID, SubDevice ID,
  45  *   Class, Class Mask, String Index }
  46  */
  47 static struct pci_device_id ixgb_pci_tbl[] = {
  48         /* Intel(R) PRO/10GbE Network Connection */
  49         {INTEL_VENDOR_ID, IXGB_DEVICE_ID_82597EX,
  50          INTEL_SUBVENDOR_ID, IXGB_SUBDEVICE_ID_A11F, 0, 0, 0},
  51         {INTEL_VENDOR_ID, IXGB_DEVICE_ID_82597EX,
  52          INTEL_SUBVENDOR_ID, IXGB_SUBDEVICE_ID_A01F, 0, 0, 0},
  53         /* Generic */
  54         {INTEL_VENDOR_ID, IXGB_DEVICE_ID_82597EX,
  55          PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
  56
  57         /* required last entry */
  58         {0,}
  59 };
  60
  61 MODULE_DEVICE_TABLE(pci, ixgb_pci_tbl);
  62
  63 static char *ixgb_strings[] = {
  64         "Intel(R) PRO/10GbE Network Connection"
  65 };
  66
  67 /* Local Function Prototypes */
  68
  69 int ixgb_up(struct ixgb_adapter *adapter);
  70 void ixgb_down(struct ixgb_adapter *adapter, boolean_t kill_watchdog);
  71 void ixgb_reset(struct ixgb_adapter *adapter);
  72
  73 static int ixgb_init_module(void);
  74 static void ixgb_exit_module(void);
  75 static int ixgb_probe(struct pci_dev *pdev, const struct pci_device_id *ent);
  76 static void ixgb_remove(struct pci_dev *pdev);
  77 static void ixgb_sw_init(struct ixgb_adapter *adapter);
  78 static int ixgb_open(struct net_device *netdev);
  79 static int ixgb_close(struct net_device *netdev);
  80 static int ixgb_setup_tx_resources(struct ixgb_adapter *adapter);
  81 static int ixgb_setup_rx_resources(struct ixgb_adapter *adapter);
  82 static void ixgb_configure_tx(struct ixgb_adapter *adapter);
  83 static void ixgb_configure_rx(struct ixgb_adapter *adapter);
  84 static void ixgb_setup_rctl(struct ixgb_adapter *adapter);
  85 static void ixgb_clean_tx_ring(struct ixgb_adapter *adapter);
  86 static void ixgb_clean_rx_ring(struct ixgb_adapter *adapter);
  87 static void ixgb_free_tx_resources(struct ixgb_adapter *adapter);
  88 static void ixgb_free_rx_resources(struct ixgb_adapter *adapter);
  89 static void ixgb_set_multi(struct net_device *netdev);
  90 static void ixgb_watchdog(unsigned long data);
  91 static inline boolean_t ixgb_tso(struct ixgb_adapter *adapter,
  92                                  struct sk_buff *skb);
  93 static int ixgb_xmit_frame(struct sk_buff *skb, struct net_device *netdev);
  94 static void ixgb_tx_timeout(struct net_device *netdev);
  95 static void ixgb_tx_timeout_task(struct net_device *netdev);
  96 static void ixgb_vlan_rx_register(struct net_device *netdev,
  97                                   struct vlan_group *grp);
  98 static void ixgb_vlan_rx_add_vid(struct net_device *netdev, u16 vid);
  99 static void ixgb_vlan_rx_kill_vid(struct net_device *netdev, u16 vid);
 100 static void ixgb_restore_vlan(struct ixgb_adapter *adapter);
 101 static struct net_device_stats *ixgb_get_stats(struct net_device *netdev);
 102 static int ixgb_change_mtu(struct net_device *netdev, int new_mtu);
 103 static int ixgb_set_mac(struct net_device *netdev, void *p);
 104 static void ixgb_update_stats(struct ixgb_adapter *adapter);
 105 static inline void ixgb_irq_disable(struct ixgb_adapter *adapter);
 106 static inline void ixgb_irq_enable(struct ixgb_adapter *adapter);
 107 static irqreturn_t ixgb_intr(int irq, void *data, struct pt_regs *regs);
 108 static void ixgb_clean_tx_irq(struct ixgb_adapter *adapter);
 109 #ifdef CONFIG_IXGB_NAPI
 110 static int ixgb_poll(struct net_device *netdev, int *budget);
 111 #else
 112 static void ixgb_clean_rx_irq(struct ixgb_adapter *adapter);
 113 #endif
 114 static void ixgb_alloc_rx_buffers(struct ixgb_adapter *adapter);
 115 static int ixgb_ioctl(struct net_device *netdev, struct ifreq *ifr, int cmd);
 116 static inline void ixgb_rx_checksum(struct ixgb_adapter *adapter,
 117                                     struct ixgb_rx_desc *rx_desc,
 118                                     struct sk_buff *skb);
 119 static int ixgb_notify_reboot(struct notifier_block *, unsigned long event,
 120                               void *ptr);
 121 static int ixgb_suspend(struct pci_dev *pdev, u32 state);
 122
 123 struct notifier_block ixgb_notifier_reboot = {
 124         .notifier_call  = ixgb_notify_reboot,
 125         .next           = NULL,
 126         .priority       = 0
 127 };
 128
 129 /* Exported from other modules */
 130
 131 extern void ixgb_check_options(struct ixgb_adapter *adapter);
 132 extern int ixgb_ethtool_ioctl(struct net_device *netdev, struct ifreq *ifr);
 133
 134 static struct pci_driver ixgb_driver = {
 135         .name           = ixgb_driver_name,
 136         .id_table       = ixgb_pci_tbl,
 137         .probe          = ixgb_probe,
 138         .remove         = __devexit_p(ixgb_remove),
 139         /* Power Managment Hooks */
 140         .suspend        = NULL,
 141         .resume         = NULL
 142 };
 143
 144 MODULE_AUTHOR("Intel Corporation, <linux.nics@intel.com>");
 145 MODULE_DESCRIPTION("Intel(R) PRO/10GbE Network Driver");
 146 MODULE_LICENSE("GPL");
 147
 148 /* some defines for controlling descriptor fetches in h/w */
 149 #define RXDCTL_PTHRESH_DEFAULT 128      /* chip considers prefech below this */
 150 #define RXDCTL_HTHRESH_DEFAULT 16       /* chip will only prefetch if tail is
 151                                            pushed this many descriptors from head */
 152 #define RXDCTL_WTHRESH_DEFAULT 16       /* chip writes back at this many or RXT0 */
 153
 154 /**
 155  * ixgb_init_module - Driver Registration Routine.
 156  *
 157  * ixgb_init_module is the first routine called when the driver is
 158  * loaded. All it does is register with the PCI subsystem.
 159  **/
 160
 161 static int __init
 162 ixgb_init_module(void)
 163 {
 164         int ret;
 165         IXGB_DBG("ixgb_init_module\n");
 166
 167         printk(KERN_INFO "%s - version %s\n", ixgb_driver_string,
 168                ixgb_driver_version);
 169         printk(KERN_INFO "%s\n", ixgb_copyright);
 170 #ifdef CONFIG_IXGB_NAPI
 171         printk(KERN_INFO "NAPI Enabled\n");
 172 #endif
 173         ret = pci_module_init(&ixgb_driver);
 174         if (ret >= 0) {
 175                 register_reboot_notifier(&ixgb_notifier_reboot);
 176         }
 177         return ret;
 178 }
 179
 180 module_init(ixgb_init_module);
 181
 182 /**
 183  * ixgb_exit_module - Driver Exit Cleanup Routine.
 184  *
 185  * ixgb_exit_module is called just before the driver is removed
 186  * from memory.
 187  **/
 188
 189 static void __exit
 190 ixgb_exit_module(void)
 191 {
 192
 193         IXGB_DBG("ixgb_exit_module\n");
 194         unregister_reboot_notifier(&ixgb_notifier_reboot);
 195         pci_unregister_driver(&ixgb_driver);
 196 }
 197
 198 module_exit(ixgb_exit_module);
 199
 200 /**
 201  * ixgb_up - Driver ifconfig UP routine.
 202  *
 203  * ixgb_up is called to initialize and bring online an interface.
 204  * @param adapter board private structure
 205  **/
 206
 207 int
 208 ixgb_up(struct ixgb_adapter *adapter)
 209 {
 210         struct net_device *netdev = adapter->netdev;
 211
 212         IXGB_DBG("ixgb_up\n");
 213
 214         if (request_irq(netdev->irq, &ixgb_intr, SA_SHIRQ | SA_SAMPLE_RANDOM,
 215                         netdev->name, netdev)) {
 216                 IXGB_DBG("%s: request_irq failed\n", netdev->name);
 217                 return -1;
 218         }
 219         /* disable interrupts and get the hardware into a known state */
 220         IXGB_WRITE_REG(&adapter->hw, IMC, 0xffffffff);
 221
 222         /* hardware was reset in probe/down, we need to reload some things */
 223         ixgb_set_multi(netdev);
 224         ixgb_restore_vlan(adapter);
 225
 226         ixgb_configure_tx(adapter);
 227         ixgb_setup_rctl(adapter);
 228         ixgb_configure_rx(adapter);
 229         ixgb_alloc_rx_buffers(adapter);
 230
 231         mod_timer(&adapter->watchdog_timer, jiffies);
 232         ixgb_irq_enable(adapter);
 233
 234         IXGB_DBG("ixgb_up: RAH_0 is <%x>\n", IXGB_READ_REG(&adapter->hw, RAH));
 235         IXGB_DBG("ixgb_up: RDBAL is <%x>\n",
 236                  IXGB_READ_REG(&adapter->hw, RDBAL));
 237         return 0;
 238 }
 239
 240 /**
 241  * ixgb_down - Driver ifconfig DOWN routine.
 242  *
 243  * ixgb_down is called to uninitialize and take offline an interface.
 244  * @param adapter board private structure
 245  * @param kill_watchdog
 246  **/
 247 void
 248 ixgb_down(struct ixgb_adapter *adapter, boolean_t kill_watchdog)
 249 {
 250         struct net_device *netdev = adapter->netdev;
 251
 252         IXGB_DBG("ixgb_down\n");
 253
 254         ixgb_irq_disable(adapter);
 255         free_irq(netdev->irq, netdev);
 256         if (kill_watchdog)
 257                 del_timer_sync(&adapter->watchdog_timer);
 258         adapter->link_speed = 0;
 259         adapter->link_duplex = 0;
 260         netif_carrier_off(netdev);
 261         netif_stop_queue(netdev);
 262
 263         ixgb_reset(adapter);
 264
 265         ixgb_clean_tx_ring(adapter);
 266         ixgb_clean_rx_ring(adapter);
 267 }
 268
 269 /**
 270  * ixgb_reset - hardware reset.
 271  *
 272  * ixgb_reset is called to initialize hardware to a known state.
 273  * @param adapter board private structure
 274  **/
 275 void
 276 ixgb_reset(struct ixgb_adapter *adapter)
 277 {
 278         IXGB_DBG("ixgb_reset\n");
 279
 280         ixgb_adapter_stop(&adapter->hw);
 281         if (!ixgb_init_hw(&adapter->hw))
 282                 IXGB_DBG("ixgb_init_hw failed.\n");
 283 }
 284
 285 /**
 286  * ixgb_probe - Device Initialization Routine.
 287  * @param pdev PCI device information struct
 288  * @param ent entry in ixgb_pci_table
 289  *
 290  * Returns 0 on success, negative on failure
 291  **/
 292
 293 static int __devinit
 294 ixgb_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
 295 {
 296         struct net_device *netdev = NULL;
 297         struct ixgb_adapter *adapter;
 298         static int cards_found = 0;
 299         unsigned long mmio_start;
 300         int mmio_len;
 301         int pci_using_dac;
 302         int i;
 303
 304         IXGB_DBG("ixgb_probe\n");
 305
 306         if ((i = pci_enable_device(pdev))) {
 307                 IXGB_ERR("pci_enable_device failed\n");
 308                 return i;
 309         }
 310
 311         if (!(i = pci_set_dma_mask(pdev, DMA_64BIT_MASK))) {
 312                 pci_using_dac = 1;
 313         } else {
 314                 if ((i = pci_set_dma_mask(pdev, DMA_32BIT_MASK))) {
 315                         IXGB_ERR("No usable DMA configuration, aborting\n");
 316                         return i;
 317                 }
 318                 pci_using_dac = 0;
 319         }
 320
 321         if ((i = pci_request_regions(pdev, ixgb_driver_name))) {
 322                 IXGB_ERR("Failed to reserve PCI I/O and Memory resources.\n");
 323                 return i;
 324         }
 325
 326         pci_set_master(pdev);
 327
 328         /* alloc_etherdev clears the memory for us */
 329         netdev = alloc_etherdev(sizeof (struct ixgb_adapter));
 330         if (!netdev) {
 331                 IXGB_ERR("Unable to allocate net_device struct\n");
 332                 goto err_alloc_etherdev;
 333         }
 334
 335         SET_MODULE_OWNER(netdev);
 336         SET_NETDEV_DEV(netdev, &pdev->dev);
 337
 338         pci_set_drvdata(pdev, netdev);
 339         adapter = netdev->priv;
 340         adapter->netdev = netdev;
 341         adapter->pdev = pdev;
 342         adapter->hw.back = adapter;
 343
 344         mmio_start = pci_resource_start(pdev, BAR_0);
 345         mmio_len = pci_resource_len(pdev, BAR_0);
 346
 347         adapter->hw.hw_addr = ioremap(mmio_start, mmio_len);
 348         if (!adapter->hw.hw_addr)
 349                 goto err_ioremap;
 350
 351         for (i = BAR_1; i <= BAR_5; i++) {
 352                 if (pci_resource_len(pdev, i) == 0)
 353                         continue;
 354                 if (pci_resource_flags(pdev, i) & IORESOURCE_IO) {
 355                         adapter->hw.io_base = pci_resource_start(pdev, i);
 356                         break;
 357                 }
 358         }
 359         IXGB_DBG("mmio_start<%lx> hw_addr<%p>\n", mmio_start,
 360                  adapter->hw.hw_addr);
 361
 362         netdev->open = &ixgb_open;
 363         netdev->stop = &ixgb_close;
 364         netdev->hard_start_xmit = &ixgb_xmit_frame;
 365         netdev->get_stats = &ixgb_get_stats;
 366         netdev->set_multicast_list = &ixgb_set_multi;
 367         netdev->set_mac_address = &ixgb_set_mac;
 368         netdev->change_mtu = &ixgb_change_mtu;
 369         netdev->do_ioctl = &ixgb_ioctl;
 370         netdev->tx_timeout = &ixgb_tx_timeout;
 371         netdev->watchdog_timeo = HZ;
 372 #ifdef CONFIG_IXGB_NAPI
 373         netdev->poll = &ixgb_poll;
 374         netdev->weight = 64;
 375 #endif
 376         netdev->vlan_rx_register = ixgb_vlan_rx_register;
 377         netdev->vlan_rx_add_vid = ixgb_vlan_rx_add_vid;
 378         netdev->vlan_rx_kill_vid = ixgb_vlan_rx_kill_vid;
 379
 380         netdev->irq = pdev->irq;
 381         netdev->mem_start = mmio_start;
 382         netdev->mem_end = mmio_start + mmio_len;
 383         netdev->base_addr = adapter->hw.io_base;
 384
 385         adapter->bd_number = cards_found;
 386         adapter->id_string = ixgb_strings[ent->driver_data];
 387         adapter->link_speed = 0;
 388         adapter->link_duplex = 0;
 389
 390         /* setup the private structure */
 391         ixgb_sw_init(adapter);
 392
 393         netdev->features = NETIF_F_SG |
 394             NETIF_F_HW_CSUM |
 395             NETIF_F_HW_VLAN_TX | NETIF_F_HW_VLAN_RX | NETIF_F_HW_VLAN_FILTER;
 396 #ifdef NETIF_F_TSO
 397         netdev->features |= NETIF_F_TSO;
 398 #endif
 399
 400         if (pci_using_dac)
 401                 netdev->features |= NETIF_F_HIGHDMA;
 402
 403         /* make sure the EEPROM is good */
 404
 405         if (!ixgb_validate_eeprom_checksum(&adapter->hw)) {
 406                 IXGB_DBG("Invalid EEPROM checksum.\n");
 407                 goto err_eeprom;
 408         }
 409
 410         ixgb_get_ee_mac_addr(&adapter->hw, netdev->dev_addr);
 411
 412         if (!is_valid_ether_addr(netdev->dev_addr)) {
 413                 IXGB_DBG("Invalid MAC address in EEPROM.\n");
 414                 goto err_eeprom;
 415         }
 416
 417         adapter->max_data_per_txd = IXGB_MAX_JUMBO_FRAME_SIZE;
 418         adapter->part_num = ixgb_get_ee_pba_number(&adapter->hw);
 419
 420         init_timer(&adapter->watchdog_timer);
 421         adapter->watchdog_timer.function = &ixgb_watchdog;
 422         adapter->watchdog_timer.data = (unsigned long) adapter;
 423
 424         INIT_WORK(&adapter->tx_timeout_task,
 425                   (void (*)(void *)) ixgb_tx_timeout_task, netdev);
 426
 427         register_netdev(netdev);
 428         memcpy(adapter->ifname, netdev->name, IFNAMSIZ);
 429         adapter->ifname[IFNAMSIZ - 1] = 0;
 430
 431         /* we're going to reset, so assume we have no link for now */
 432
 433         netif_carrier_off(netdev);
 434         netif_stop_queue(netdev);
 435
 436         printk(KERN_INFO "%s: %s\n", netdev->name, adapter->id_string);
 437         ixgb_check_options(adapter);
 438
 439         /* reset the hardware with the new settings */
 440         ixgb_reset(adapter);
 441
 442         cards_found++;
 443         return 0;
 444
 445       err_eeprom:
 446         iounmap(adapter->hw.hw_addr);
 447       err_ioremap:
 448         pci_release_regions(pdev);
 449         free_netdev(netdev);
 450       err_alloc_etherdev:
 451         return -ENOMEM;
 452 }
 453
 454 /**
 455  * ixgb_remove - Device Removal Routine.
 456  * @param pdev PCI device information struct
 457  *
 458  * ixgb_remove is called by the PCI subsystem to alert the driver
 459  * that it should release a PCI device.  The could be caused by a
 460  * Hot-Plug event, or because the driver is going to be removed from
 461  * memory.
 462  **/
 463
 464 static void __devexit
 465 ixgb_remove(struct pci_dev *pdev)
 466 {
 467         struct net_device *netdev = pci_get_drvdata(pdev);
 468         struct ixgb_adapter *adapter = netdev->priv;
 469
 470         IXGB_DBG("ixgb_remove\n");
 471
 472         unregister_netdev(netdev);
 473
 474 #ifdef ETHTOOL_IDENTIFY
 475         ixgb_identify_stop(adapter);
 476 #endif
 477
 478         iounmap((void *) adapter->hw.hw_addr);
 479         pci_release_regions(pdev);
 480
 481         free_netdev(netdev);
 482 }
 483
 484 /**
 485  * ixgb_sw_init - Initialize general software structures (struct ixgb_adapter).
 486  * @param adapter board private structure to initialize
 487  *
 488  * ixgb_sw_init initializes the adapter private data structure.
 489  * Fields are initialized based on PCI device information and
 490  * OS network device settings (MTU size).
 491  **/
 492
 493 static void __devinit
 494 ixgb_sw_init(struct ixgb_adapter *adapter)
 495 {
 496         struct ixgb_hw *hw = &adapter->hw;
 497         struct net_device *netdev = adapter->netdev;
 498         struct pci_dev *pdev = adapter->pdev;
 499
 500         IXGB_DBG("ixgb_sw_init\n");
 501
 502         /* PCI config space info */
 503
 504         /* FIXME: do not store, instead directly use struct pci_dev
 505          * where needed
 506          */
 507         hw->vendor_id = pdev->vendor;
 508         hw->device_id = pdev->device;
 509         hw->subsystem_vendor_id = pdev->subsystem_vendor;
 510         hw->subsystem_id = pdev->subsystem_device;
 511
 512         adapter->rx_buffer_len = IXGB_RXBUFFER_2048;
 513
 514         hw->max_frame_size = netdev->mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;
 515
 516         if (hw->device_id == IXGB_DEVICE_ID_82597EX)
 517                 hw->mac_type = ixgb_82597;
 518         else {
 519                 /* should never have loaded on this device */
 520                 printk(KERN_ERR "ixgb: unsupported device id\n");
 521         }
 522
 523         /* enable flow control to be programmed */
 524         hw->fc.send_xon = 1;
 525
 526         atomic_set(&adapter->irq_sem, 1);
 527 }
 528
 529 /**
 530  * ixgb_open - Called when a network interface is made active.
 531  * @param netdev network interface device structure
 532  *
 533  * Returns 0 on success, negative value on failure
 534  *
 535  * The open entry point is called when a network interface is made
 536  * active by the system (IFF_UP).  At this point all resources needed
 537  * for transmit and receive operations are allocated, the interrupt
 538  * handler is registered with the OS, the watchdog timer is started,
 539  * and the stack is notified that the interface is ready.
 540  **/
 541
 542 static int
 543 ixgb_open(struct net_device *netdev)
 544 {
 545         struct ixgb_adapter *adapter = netdev->priv;
 546
 547         IXGB_DBG("ixgb_open\n");
 548
 549         /* allocate transmit descriptors */
 550
 551         if (ixgb_setup_tx_resources(adapter)) {
 552                 IXGB_DBG("ixgb_open: failed ixgb_setup_tx_resources.\n");
 553                 goto err_setup_tx;
 554         }
 555
 556         /* allocate receive descriptors and buffers */
 557
 558         if (ixgb_setup_rx_resources(adapter)) {
 559                 IXGB_DBG("ixgb_open: failed ixgb_setup_rx_resources.\n");
 560                 goto err_setup_rx;
 561         }
 562         if (ixgb_up(adapter))
 563                 goto err_up;
 564
 565         return 0;
 566
 567       err_up:
 568         ixgb_free_rx_resources(adapter);
 569       err_setup_rx:
 570         ixgb_free_tx_resources(adapter);
 571       err_setup_tx:
 572         ixgb_reset(adapter);
 573         return -EBUSY;
 574 }
 575
 576 /**
 577  * ixgb_close - Disables a network interface.
 578  * @param netdev network interface device structure
 579  *
 580  * Returns 0, this is not allowed to fail
 581  *
 582  * The close entry point is called when an interface is de-activated
 583  * by the OS.  The hardware is still under the drivers control, but
 584  * needs to be disabled.  A global MAC reset is issued to stop the
 585  * hardware, and all transmit and receive resources are freed.
 586  **/
 587
 588 static int
 589 ixgb_close(struct net_device *netdev)
 590 {
 591         struct ixgb_adapter *adapter = netdev->priv;
 592
 593         IXGB_DBG("ixgb_close\n");
 594
 595         ixgb_down(adapter, TRUE);
 596
 597         ixgb_free_tx_resources(adapter);
 598         ixgb_free_rx_resources(adapter);
 599
 600         return 0;
 601 }
 602
 603 /**
 604  * ixgb_setup_tx_resources - allocate Tx resources (Descriptors).
 605  * @param adapter board private structure
 606  *
 607  * Return 0 on success, negative on failure
 608  **/
 609
 610 static int
 611 ixgb_setup_tx_resources(struct ixgb_adapter *adapter)
 612 {
 613         struct pci_dev *pdev = adapter->pdev;
 614         struct ixgb_desc_ring *txdr = &adapter->tx_ring;
 615         int size;
 616
 617         IXGB_DBG("ixgb_setup_tx_resources\n");
 618
 619         size = sizeof (struct ixgb_buffer) * txdr->count;
 620         txdr->buffer_info = kmalloc(size, GFP_KERNEL);
 621         if (!txdr->buffer_info) {
 622                 return -ENOMEM;
 623         }
 624         memset(txdr->buffer_info, 0, size);
 625
 626         /* round up to nearest 4K */
 627         txdr->size = txdr->count * sizeof (struct ixgb_tx_desc);
 628         IXGB_ROUNDUP(txdr->size, 4096);
 629
 630         txdr->desc = pci_alloc_consistent(pdev, txdr->size, &txdr->dma);
 631         if (!txdr->desc) {
 632                 kfree(txdr->buffer_info);
 633                 return -ENOMEM;
 634         }
 635         memset(txdr->desc, 0, txdr->size);
 636
 637         IXGB_DBG("txdr->desc <%p>\n", txdr->desc);
 638         IXGB_DBG("txdr->next_to_use = <%p>\n", &txdr->next_to_use);
 639         IXGB_DBG("txdr->next_to_clean = <%p>\n", &txdr->next_to_clean);
 640
 641         txdr->next_to_use = 0;
 642         txdr->next_to_clean = 0;
 643
 644         return 0;
 645 }
 646
 647 /**
 648  * ixgb_configure_tx - Configure 82597 Transmit Unit after Reset.
 649  * @adapter board private structure
 650  *
 651  * Configure the Tx unit of the MAC after a reset.
 652  **/
 653
 654 static void
 655 ixgb_configure_tx(struct ixgb_adapter *adapter)
 656 {
 657         u32 tctl;
 658         u32 tdlen = adapter->tx_ring.count * sizeof (struct ixgb_tx_desc);
 659         uint64_t tdba = adapter->tx_ring.dma;
 660         struct ixgb_hw *hw = &adapter->hw;
 661
 662         IXGB_DBG("ixgb_configure_tx\n");
 663
 664         /* Setup the Base and Length of the Tx Descriptor Ring
 665          * tx_ring.dma can be either a 32 or 64 bit value
 666          */
 667
 668         IXGB_WRITE_REG(hw, TDBAL, (tdba & 0x00000000ffffffffULL));
 669         IXGB_WRITE_REG(hw, TDBAH, (tdba >> 32));
 670
 671         IXGB_WRITE_REG(hw, TDLEN, tdlen);
 672
 673         /* Setup the HW Tx Head and Tail descriptor pointers */
 674
 675         IXGB_WRITE_REG(hw, TDH, 0);
 676         IXGB_WRITE_REG(hw, TDT, 0);
 677
 678         /* don't set up txdctl, it induces performance problems if
 679          * configured incorrectly
 680          txdctl  = TXDCTL_PTHRESH_DEFAULT; // prefetch txds below this threshold
 681          txdctl |= (TXDCTL_HTHRESH_DEFAULT // only prefetch if there are this many ready
 682          << IXGB_TXDCTL_HTHRESH_SHIFT);
 683          IXGB_WRITE_REG (hw, TXDCTL, txdctl);
 684          */
 685
 686         /* Set the Tx Interrupt Delay register */
 687
 688         IXGB_WRITE_REG(hw, TIDV, adapter->tx_int_delay);
 689
 690         /* Program the Transmit Control Register */
 691
 692         tctl = IXGB_TCTL_TCE | IXGB_TCTL_TXEN | IXGB_TCTL_TPDE;
 693         IXGB_WRITE_REG(hw, TCTL, tctl);
 694
 695         /* Setup Transmit Descriptor Settings for this adapter */
 696         adapter->tx_cmd_type =
 697             IXGB_TX_DESC_TYPE | IXGB_TX_DESC_CMD_RS
 698             | (adapter->tx_int_delay_enable ? IXGB_TX_DESC_CMD_IDE : 0);
 699 }
 700
 701 /**
 702  * ixgb_setup_rx_resources - allocate Rx resources (Descriptors).
 703  * @param adapter board private structure
 704  *
 705  * Returns 0 on success, negative on failure
 706  **/
 707
 708 static int
 709 ixgb_setup_rx_resources(struct ixgb_adapter *adapter)
 710 {
 711         struct pci_dev *pdev = adapter->pdev;
 712         struct ixgb_desc_ring *rxdr = &adapter->rx_ring;
 713         int size;
 714
 715         IXGB_DBG("ixgb_setup_rx_resources.\n");
 716
 717         size = sizeof (struct ixgb_buffer) * rxdr->count;
 718         rxdr->buffer_info = kmalloc(size, GFP_KERNEL);
 719         if (!rxdr->buffer_info) {
 720                 return -ENOMEM;
 721         }
 722         memset(rxdr->buffer_info, 0, size);
 723
 724         /* Round up to nearest 4K */
 725         rxdr->size = rxdr->count * sizeof (struct ixgb_rx_desc);
 726         IXGB_ROUNDUP(rxdr->size, 4096);
 727
 728         rxdr->desc = pci_alloc_consistent(pdev, rxdr->size, &rxdr->dma);
 729
 730         if (!rxdr->desc) {
 731                 IXGB_DBG("pci_alloc_consistent failed.\n");
 732                 kfree(rxdr->buffer_info);
 733                 return -ENOMEM;
 734         }
 735         memset(rxdr->desc, 0, rxdr->size);
 736
 737         IXGB_DBG("rxdr->desc <%p>\n", rxdr->desc);
 738         IXGB_DBG("rxdr->next_to_use = <%p>\n", &rxdr->next_to_use);
 739         IXGB_DBG("rxdr->next_to_clean = <%p>\n", &rxdr->next_to_clean);
 740
 741         rxdr->next_to_use = 0;
 742         rxdr->next_to_clean = 0;
 743
 744         return 0;
 745 }
 746
 747 /**
 748  * ixgb_setup_rctl - configure the receive control register.
 749  * @param adapter Board private structure
 750  **/
 751
 752 static void
 753 ixgb_setup_rctl(struct ixgb_adapter *adapter)
 754 {
 755         u32 rctl;
 756
 757         rctl = IXGB_READ_REG(&adapter->hw, RCTL);
 758
 759         IXGB_DBG("ixgb_setup_rctl\n");
 760
 761         rctl &= ~(3 << IXGB_RCTL_MO_SHIFT);
 762
 763         rctl |=
 764             IXGB_RCTL_BAM | IXGB_RCTL_RDMTS_1_2 |
 765             IXGB_RCTL_RXEN | IXGB_RCTL_CFF |
 766             (adapter->hw.mc_filter_type << IXGB_RCTL_MO_SHIFT);
 767
 768         rctl |= IXGB_RCTL_SECRC;
 769
 770         switch (adapter->rx_buffer_len) {
 771         case IXGB_RXBUFFER_2048:
 772         default:
 773                 rctl |= IXGB_RCTL_BSIZE_2048;
 774                 break;
 775         case IXGB_RXBUFFER_4096:
 776                 rctl |= IXGB_RCTL_BSIZE_4096;
 777                 break;
 778         case IXGB_RXBUFFER_8192:
 779                 rctl |= IXGB_RCTL_BSIZE_8192;
 780                 break;
 781         case IXGB_RXBUFFER_16384:
 782                 rctl |= IXGB_RCTL_BSIZE_16384;
 783                 break;
 784         }
 785         IXGB_WRITE_REG(&adapter->hw, RCTL, rctl);
 786 }
 787
 788 /**
 789  * ixgb_configure_rx - Configure 82597 Receive Unit after Reset.
 790  * @param adapter board private structure
 791  *
 792  * Configure the Rx unit of the MAC after a reset.
 793  **/
 794
 795 static void
 796 ixgb_configure_rx(struct ixgb_adapter *adapter)
 797 {
 798         uint64_t rdba = adapter->rx_ring.dma;
 799         u32 rdlen = adapter->rx_ring.count * sizeof (struct ixgb_rx_desc);
 800         struct ixgb_hw *hw = &adapter->hw;
 801         u32 rctl;
 802         u32 rxcsum;
 803
 804         IXGB_DBG("ixgb_configure_rx\n");
 805
 806         /* make sure receives are disabled while setting up the descriptors */
 807         rctl = IXGB_READ_REG(hw, RCTL);
 808         IXGB_WRITE_REG(hw, RCTL, rctl & ~IXGB_RCTL_RXEN);
 809
 810         /* set the Receive Delay Timer Register */
 811         IXGB_WRITE_REG(hw, RDTR, adapter->rx_int_delay);
 812
 813         /* Setup the Base and Length of the Rx Descriptor Ring */
 814         IXGB_WRITE_REG(hw, RDBAL, (rdba & 0x00000000ffffffffULL));
 815         IXGB_WRITE_REG(hw, RDBAH, (rdba >> 32));
 816
 817         IXGB_WRITE_REG(hw, RDLEN, rdlen);
 818
 819         /* Setup the HW Rx Head and Tail Descriptor Pointers */
 820         IXGB_WRITE_REG(hw, RDH, 0);
 821         IXGB_WRITE_REG(hw, RDT, 0);
 822
 823         {
 824                 u32 rxdctl;
 825                 /* burst 16 or burst when RXT0 */
 826                 rxdctl = RXDCTL_WTHRESH_DEFAULT << IXGB_RXDCTL_WTHRESH_SHIFT
 827                     | RXDCTL_HTHRESH_DEFAULT << IXGB_RXDCTL_HTHRESH_SHIFT
 828                     | RXDCTL_PTHRESH_DEFAULT << IXGB_RXDCTL_PTHRESH_SHIFT;
 829                 IXGB_WRITE_REG(hw, RXDCTL, rxdctl);
 830         }
 831
 832         if (adapter->raidc) {
 833                 u32 raidc;
 834                 u8 poll_threshold;
 835
 836                 /* Poll every rx_int_delay period, if RBD exists
 837                  * Receive Backlog Detection is set to <threshold>
 838                  * Rx Descriptors
 839                  * max is 0x3F == set to poll when 504 RxDesc left
 840                  * min is 0 */
 841
 842                 /* polling times are 1 == 0.8192us
 843                    2 == 1.6384us
 844                    3 == 3.2768us etc
 845                    ...
 846                    511 == 418 us
 847                  */
 848 #define IXGB_RAIDC_POLL_DEFAULT 122     /* set to poll every ~100 us under load
 849                                            also known as 10000 interrupts / sec */
 850
 851                 /* divide this by 2^3 (8) to get a register size count */
 852                 poll_threshold = ((adapter->rx_ring.count - 1) >> 3);
 853                 /* poll at half of that size */
 854                 poll_threshold >>= 1;
 855                 /* make sure its not bigger than our max */
 856                 poll_threshold &= 0x3F;
 857
 858                 raidc = IXGB_RAIDC_EN | /* turn on raidc style moderation */
 859                     IXGB_RAIDC_RXT_GATE |       /* don't interrupt with rxt0 while
 860                                                    in RBD mode (polling) */
 861                     (IXGB_RAIDC_POLL_DEFAULT << IXGB_RAIDC_POLL_SHIFT) |
 862                     /* this sets the regular "min interrupt delay" */
 863                     (adapter->rx_int_delay << IXGB_RAIDC_DELAY_SHIFT) |
 864                     poll_threshold;
 865
 866                 IXGB_WRITE_REG(hw, RAIDC, raidc);
 867         }
 868
 869         /* Enable Receive Checksum Offload for TCP and UDP */
 870         if (adapter->rx_csum == TRUE) {
 871                 rxcsum = IXGB_READ_REG(hw, RXCSUM);
 872                 rxcsum |= IXGB_RXCSUM_TUOFL;
 873                 IXGB_WRITE_REG(hw, RXCSUM, rxcsum);
 874         }
 875
 876         /* Enable Receives */
 877
 878         IXGB_WRITE_REG(hw, RCTL, rctl);
 879 }
 880
 881 /**
 882  * ixgb_free_tx_resources - Free Tx Resources.
 883  * @param adapter board private structure
 884  *
 885  * Free all transmit software resources
 886  **/
 887
 888 static void
 889 ixgb_free_tx_resources(struct ixgb_adapter *adapter)
 890 {
 891         struct pci_dev *pdev = adapter->pdev;
 892
 893         IXGB_DBG("ixgb_free_tx_resources\n");
 894
 895         ixgb_clean_tx_ring(adapter);
 896
 897         kfree(adapter->tx_ring.buffer_info);
 898         adapter->tx_ring.buffer_info = NULL;
 899
 900         pci_free_consistent(pdev, adapter->tx_ring.size, adapter->tx_ring.desc,
 901                             adapter->tx_ring.dma);
 902
 903         adapter->tx_ring.desc = NULL;
 904 }
 905
 906 /**
 907  * ixgb_clean_tx_ring - Free Tx Buffers.
 908  * @param adapter board private structure
 909  **/
 910
 911 static void
 912 ixgb_clean_tx_ring(struct ixgb_adapter *adapter)
 913 {
 914         struct pci_dev *pdev = adapter->pdev;
 915         unsigned long size;
 916         int i;
 917
 918         IXGB_DBG("ixgb_clean_tx_ring\n");
 919
 920         /* Free all the Tx ring sk_buffs */
 921
 922         for (i = 0; i < adapter->tx_ring.count; i++) {
 923                 if (adapter->tx_ring.buffer_info[i].skb) {
 924
 925                         pci_unmap_page(pdev,
 926                                        adapter->tx_ring.buffer_info[i].dma,
 927                                        adapter->tx_ring.buffer_info[i].length,
 928                                        PCI_DMA_TODEVICE);
 929
 930                         dev_kfree_skb(adapter->tx_ring.buffer_info[i].skb);
 931
 932                         adapter->tx_ring.buffer_info[i].skb = NULL;
 933                 }
 934         }
 935
 936         size = sizeof (struct ixgb_buffer) * adapter->tx_ring.count;
 937         memset(adapter->tx_ring.buffer_info, 0, size);
 938
 939         /* Zero out the descriptor ring */
 940
 941         memset(adapter->tx_ring.desc, 0, adapter->tx_ring.size);
 942
 943         adapter->tx_ring.next_to_use = 0;
 944         adapter->tx_ring.next_to_clean = 0;
 945
 946         IXGB_WRITE_REG(&adapter->hw, TDH, 0);
 947         IXGB_WRITE_REG(&adapter->hw, TDT, 0);
 948 }
 949
 950 /**
 951  * ixgb_free_rx_resources - Free Rx Resources.
 952  * @param adapter board private structure
 953  *
 954  * Free all receive software resources
 955  **/
 956
 957 static void
 958 ixgb_free_rx_resources(struct ixgb_adapter *adapter)
 959 {
 960         struct pci_dev *pdev = adapter->pdev;
 961
 962         IXGB_DBG("ixgb_free_rx_resources\n");
 963
 964         ixgb_clean_rx_ring(adapter);
 965
 966         kfree(adapter->rx_ring.buffer_info);
 967         adapter->rx_ring.buffer_info = NULL;
 968
 969         pci_free_consistent(pdev, adapter->rx_ring.size,
 970                             adapter->rx_ring.desc, adapter->rx_ring.dma);
 971
 972         adapter->rx_ring.desc = NULL;
 973 }
 974
 975 /**
 976  * ixgb_clean_rx_ring - Free Rx Buffers.
 977  * @param adapter board private structure
 978  **/
 979
 980 static void
 981 ixgb_clean_rx_ring(struct ixgb_adapter *adapter)
 982 {
 983         struct pci_dev *pdev = adapter->pdev;
 984         unsigned long size;
 985         int i;
 986
 987         IXGB_DBG("ixgb_free_rx_ring\n");
 988
 989         /* Free all the Rx ring sk_buffs */
 990
 991         for (i = 0; i < adapter->rx_ring.count; i++) {
 992                 if (adapter->rx_ring.buffer_info[i].skb) {
 993
 994                         pci_unmap_single(pdev,
 995                                          adapter->rx_ring.buffer_info[i].dma,
 996                                          adapter->rx_ring.buffer_info[i].length,
 997                                          PCI_DMA_FROMDEVICE);
 998
 999                         dev_kfree_skb(adapter->rx_ring.buffer_info[i].skb);
1000
1001                         adapter->rx_ring.buffer_info[i].skb = NULL;
1002                 }
1003         }
1004
1005         size = sizeof (struct ixgb_buffer) * adapter->rx_ring.count;
1006         memset(adapter->rx_ring.buffer_info, 0, size);
1007
1008         /* Zero out the descriptor ring */
1009
1010         memset(adapter->rx_ring.desc, 0, adapter->rx_ring.size);
1011
1012         adapter->rx_ring.next_to_clean = 0;
1013         adapter->rx_ring.next_to_use = 0;
1014
1015         IXGB_WRITE_REG(&adapter->hw, RDH, 0);
1016         IXGB_WRITE_REG(&adapter->hw, RDT, 0);
1017 }
1018
1019 /**
1020  * ixgb_set_multi - Multicast and Promiscuous mode set.
1021  * @param netdev network interface device structure
1022  *
1023  * The set_multi entry point is called whenever the multicast address
1024  * list or the network interface flags are updated.  This routine is
1025  * resposible for configuring the hardware for proper multicast,
1026  * promiscuous mode, and all-multi behavior.
1027  **/
1028
1029 void
1030 ixgb_set_multi(struct net_device *netdev)
1031 {
1032         struct ixgb_adapter *adapter = netdev->priv;
1033         struct ixgb_hw *hw = &adapter->hw;
1034         u32 rctl;
1035         int i;
1036         struct dev_mc_list *mc_ptr;
1037
1038         IXGB_DBG("ixgb_set_multi <%x>\n", netdev->flags);
1039
1040         /* Check for Promiscuous and All Multicast modes */
1041
1042         rctl = IXGB_READ_REG(&adapter->hw, RCTL);
1043
1044         if (netdev->flags & IFF_PROMISC) {
1045                 rctl |= (IXGB_RCTL_UPE | IXGB_RCTL_MPE);
1046         } else if (netdev->flags & IFF_ALLMULTI) {
1047                 rctl |= IXGB_RCTL_MPE;
1048                 rctl &= ~IXGB_RCTL_UPE;
1049         } else {
1050                 rctl &= ~(IXGB_RCTL_UPE | IXGB_RCTL_MPE);
1051         }
1052
1053         if (netdev->mc_count > IXGB_MAX_NUM_MULTICAST_ADDRESSES) {
1054                 rctl |= IXGB_RCTL_MPE;
1055                 IXGB_WRITE_REG(hw, RCTL, rctl);
1056         } else {
1057                 u8 mta[netdev->mc_count * IXGB_ETH_LENGTH_OF_ADDRESS];
1058
1059                 IXGB_WRITE_REG(hw, RCTL, rctl);
1060
1061                 for (i = 0, mc_ptr = netdev->mc_list; mc_ptr;
1062                      i++, mc_ptr = mc_ptr->next)
1063                         memcpy(&mta[i * IXGB_ETH_LENGTH_OF_ADDRESS],
1064                                mc_ptr->dmi_addr, IXGB_ETH_LENGTH_OF_ADDRESS);
1065
1066                 ixgb_mc_addr_list_update(hw, mta, netdev->mc_count, 0);
1067         }
1068 }
1069
1070 /**
1071  * ixgb_watchdog - Timer Call-back.
1072  * @param data pointer to adapter cast into an unsigned long
1073  **/
1074
1075 void
1076 ixgb_watchdog(unsigned long data)
1077 {
1078         struct ixgb_adapter *adapter = (struct ixgb_adapter *) data;
1079         struct net_device *netdev = adapter->netdev;
1080
1081         ixgb_check_for_link(&adapter->hw);
1082
1083         if (ixgb_check_for_bad_link(&adapter->hw)) {
1084                 /* force the reset path */
1085                 netif_stop_queue(netdev);
1086         }
1087
1088         if (adapter->hw.link_up) {
1089                 if (!netif_carrier_ok(netdev)) {
1090                         printk(KERN_INFO "ixgb: %s NIC Link is Up %d Mbps %s\n",
1091                                netdev->name, 10000, "Full Duplex");
1092                         adapter->link_speed = 10000;
1093                         adapter->link_duplex = FULL_DUPLEX;
1094                         netif_carrier_on(netdev);
1095                         netif_wake_queue(netdev);
1096                 }
1097         } else {
1098                 if (netif_carrier_ok(netdev)) {
1099                         printk(KERN_INFO "ixgb: %s NIC Link is Down\n",
1100                                netdev->name);
1101                         adapter->link_speed = 0;
1102                         adapter->link_duplex = 0;
1103                         netif_carrier_off(netdev);
1104                         netif_stop_queue(netdev);
1105
1106                         ixgb_down(adapter, FALSE);
1107                         ixgb_up(adapter);
1108                 }
1109         }
1110
1111         ixgb_update_stats(adapter);
1112
1113         /* Early detection of hung controller */
1114         {
1115                 struct ixgb_desc_ring *txdr = &adapter->tx_ring;
1116                 int i = txdr->next_to_clean;
1117
1118                 if (txdr->buffer_info[i].dma &&
1119                     time_after(jiffies, txdr->buffer_info[i].time_stamp + HZ) &&
1120                     !(IXGB_READ_REG(&adapter->hw, STATUS) & IXGB_STATUS_TXOFF))
1121                 {
1122                         IXGB_DBG
1123                             ("ixgb: %s Hung controller? Watchdog stopping queue\n",
1124                              netdev->name);
1125                         netif_stop_queue(netdev);
1126                 }
1127         }
1128
1129         /* generate an interrupt to force clean up of any stragglers */
1130         IXGB_WRITE_REG(&adapter->hw, ICS, IXGB_INT_TXDW);
1131
1132         /* Reset the timer */
1133         mod_timer(&adapter->watchdog_timer, jiffies + 2 * HZ);
1134 }
1135
1136 #define IXGB_TX_FLAGS_CSUM      0x00000001
1137 #define IXGB_TX_FLAGS_VLAN      0x00000002
1138 #define IXGB_TX_FLAGS_TSO       0x00000004
1139
1140 /** Transmit Segmentation offload setup.
1141  * ixgb_tso - (Large Send) setup where the initial descriptor is prepared
1142  * @param adapter adapter specific information
1143  * @param skb the skb we are trying to set up for segmentation
1144  **/
1145
1146 static inline boolean_t
1147 ixgb_tso(struct ixgb_adapter *adapter, struct sk_buff *skb)
1148 {
1149 #ifdef NETIF_F_TSO
1150         struct ixgb_context_desc *context_desc;
1151         int i;
1152         u8 ipcss, ipcso, tucss, tucso, hdr_len;
1153         u16 ipcse, tucse, mss;
1154
1155         if (likely(skb_shinfo(skb)->tso_size)) {
1156                 hdr_len = ((skb->h.raw - skb->data) + (skb->h.th->doff << 2));
1157                 mss = skb_shinfo(skb)->tso_size;
1158                 skb->nh.iph->tot_len = 0;
1159                 skb->nh.iph->check = 0;
1160                 skb->h.th->check = ~csum_tcpudp_magic(skb->nh.iph->saddr,
1161                                                       skb->nh.iph->daddr,
1162                                                       0, IPPROTO_TCP, 0);
1163                 ipcss = skb->nh.raw - skb->data;
1164                 ipcso = (void *) &(skb->nh.iph->check) - (void *) skb->data;
1165                 ipcse = skb->h.raw - skb->data - 1;
1166                 tucss = skb->h.raw - skb->data;
1167                 tucso = (void *) &(skb->h.th->check) - (void *) skb->data;
1168                 tucse = 0;
1169
1170                 i = adapter->tx_ring.next_to_use;
1171                 context_desc = IXGB_CONTEXT_DESC(adapter->tx_ring, i);
1172
1173                 context_desc->ipcss = ipcss;
1174                 context_desc->ipcso = ipcso;
1175                 context_desc->ipcse = cpu_to_le16(ipcse);
1176                 context_desc->tucss = tucss;
1177                 context_desc->tucso = tucso;
1178                 context_desc->tucse = cpu_to_le16(tucse);
1179                 context_desc->mss = cpu_to_le16(mss);
1180                 context_desc->hdr_len = hdr_len;
1181                 context_desc->status = 0;
1182                 context_desc->cmd_type_len = cpu_to_le32(IXGB_CONTEXT_DESC_TYPE
1183                                                          |
1184                                                          IXGB_CONTEXT_DESC_CMD_TSE
1185                                                          |
1186                                                          IXGB_CONTEXT_DESC_CMD_IP
1187                                                          |
1188                                                          IXGB_CONTEXT_DESC_CMD_TCP
1189                                                          |
1190                                                          IXGB_CONTEXT_DESC_CMD_RS
1191                                                          |
1192                                                          IXGB_CONTEXT_DESC_CMD_IDE
1193                                                          | (skb->len -
1194                                                             (hdr_len)));
1195
1196                 i = (i + 1) % adapter->tx_ring.count;
1197                 adapter->tx_ring.next_to_use = i;
1198
1199                 return TRUE;
1200         }
1201 #endif
1202         return FALSE;
1203 }
1204
1205 /**
1206  * ixgb_tx_csum - prepare context descriptor for checksum offload.
1207  *
1208  * ixgb_tx_csum is called to prepare for checksumming a packet in hw.
1209  * @param adapter board private structure
1210  * @param skb structure containing data to send
1211  **/
1212 static inline boolean_t
1213 ixgb_tx_csum(struct ixgb_adapter *adapter, struct sk_buff *skb)
1214 {
1215         struct ixgb_context_desc *context_desc;
1216         int i;
1217         u8 css, cso;
1218
1219         if (likely(skb->ip_summed == CHECKSUM_HW)) {
1220                 css = skb->h.raw - skb->data;
1221                 cso = (skb->h.raw + skb->csum) - skb->data;
1222                 i = adapter->tx_ring.next_to_use;
1223                 context_desc = IXGB_CONTEXT_DESC(adapter->tx_ring, i);
1224
1225                 context_desc->tucss = css;
1226                 context_desc->tucso = cso;
1227                 context_desc->tucse = 0;
1228                 /* zero out any previously existing data in one instruction */
1229                 *(u32 *) & (context_desc->ipcss) = 0;
1230                 context_desc->status = 0;
1231                 context_desc->hdr_len = 0;
1232                 context_desc->mss = 0;
1233                 context_desc->cmd_type_len =
1234                     cpu_to_le32(IXGB_CONTEXT_DESC_TYPE
1235                                 | IXGB_TX_DESC_CMD_RS | IXGB_TX_DESC_CMD_IDE);
1236
1237                 i = (i + 1) % adapter->tx_ring.count;
1238                 adapter->tx_ring.next_to_use = i;
1239
1240                 return TRUE;
1241         }
1242
1243         return FALSE;
1244 }
1245
1246 /**
1247  * ixgb_tx_map - private function for mapping send data to hardware addresses.
1248  *
1249  * @param adapter board private structure
1250  * @param skb structure containing data to send
1251  **/
1252
1253 static inline int
1254 ixgb_tx_map(struct ixgb_adapter *adapter, struct sk_buff *skb)
1255 {
1256         struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
1257         int len, offset, count, size, i;
1258
1259         int f;
1260         len = skb->len - skb->data_len;
1261
1262         i = (tx_ring->next_to_use + tx_ring->count - 1) % tx_ring->count;
1263         count = 0;
1264
1265         offset = 0;
1266
1267         while (len) {
1268                 i = (i + 1) % tx_ring->count;
1269                 size = min(len, adapter->max_data_per_txd);
1270                 tx_ring->buffer_info[i].length = size;
1271                 tx_ring->buffer_info[i].dma =
1272                     pci_map_single(adapter->pdev, skb->data + offset, size,
1273                                    PCI_DMA_TODEVICE);
1274
1275                 tx_ring->buffer_info[i].time_stamp = jiffies;
1276
1277                 len -= size;
1278                 offset += size;
1279                 count++;
1280         }
1281
1282         for (f = 0; f < skb_shinfo(skb)->nr_frags; f++) {
1283                 struct skb_frag_struct *frag;
1284
1285                 frag = &skb_shinfo(skb)->frags[f];
1286                 len = frag->size;
1287                 offset = 0;
1288
1289                 while (len) {
1290                         i = (i + 1) % tx_ring->count;
1291                         size = min(len, adapter->max_data_per_txd);
1292                         tx_ring->buffer_info[i].length = size;
1293                         tx_ring->buffer_info[i].dma =
1294                             pci_map_page(adapter->pdev, frag->page,
1295                                          frag->page_offset + offset, size,
1296                                          PCI_DMA_TODEVICE);
1297
1298                         tx_ring->buffer_info[i].time_stamp = jiffies;
1299                         len -= size;
1300                         offset += size;
1301                         count++;
1302                 }
1303         }
1304         tx_ring->buffer_info[i].skb = skb;
1305
1306         return count;
1307 }
1308
1309 /**
1310  * ixgb_tx_queue - private function to start transmit on hardware.
1311  *
1312  * @param adapter board private structure
1313  * @param count number of tx_descriptors to initialize (consume)
1314  * @param vlan_id the vlan tag to insert (if necessary)
1315  * @param tx_flags special handling for this transmit, if any
1316  **/
1317
1318 static inline void
1319 ixgb_tx_queue(struct ixgb_adapter *adapter, int count, int vlan_id,
1320               int tx_flags)
1321 {
1322         struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
1323         struct ixgb_tx_desc *tx_desc = NULL;
1324         u32 cmd_type_len = adapter->tx_cmd_type;
1325         u8 status = 0;
1326         u8 popts = 0;
1327         int i;
1328
1329         if (tx_flags & IXGB_TX_FLAGS_TSO) {
1330                 cmd_type_len |= IXGB_TX_DESC_CMD_TSE;
1331                 popts |= (IXGB_TX_DESC_POPTS_IXSM | IXGB_TX_DESC_POPTS_TXSM);
1332         }
1333
1334         if (tx_flags & IXGB_TX_FLAGS_CSUM)
1335                 popts |= IXGB_TX_DESC_POPTS_TXSM;
1336
1337         if (tx_flags & IXGB_TX_FLAGS_VLAN) {
1338                 cmd_type_len |= IXGB_TX_DESC_CMD_VLE;
1339         }
1340
1341         i = tx_ring->next_to_use;
1342
1343         while (count--) {
1344                 tx_desc = IXGB_TX_DESC(*tx_ring, i);
1345                 tx_desc->buff_addr = cpu_to_le64(tx_ring->buffer_info[i].dma);
1346                 tx_desc->cmd_type_len =
1347                     cpu_to_le32(cmd_type_len | tx_ring->buffer_info[i].length);
1348                 tx_desc->status = status;
1349                 tx_desc->popts = popts;
1350                 tx_desc->vlan = cpu_to_le16(vlan_id);
1351
1352                 i = (i + 1) % tx_ring->count;
1353         }
1354
1355         tx_desc->cmd_type_len |= cpu_to_le32(IXGB_TX_DESC_CMD_EOP);
1356
1357         /* Force memory writes to complete before letting h/w
1358          * know there are new descriptors to fetch.  (Only
1359          * applicable for weak-ordered memory model archs,
1360          * such as IA-64). */
1361         wmb();
1362
1363         tx_ring->next_to_use = i;
1364         IXGB_WRITE_REG(&adapter->hw, TDT, i);
1365 }
1366
1367 #define TXD_USE_COUNT(S, X) (((S) / (X)) + (((S) % (X)) ? 1 : 0))
1368
1369 /**
1370  * ixgb_xmit_frame - hard_start_xmit linked function, transmit entry point.
1371  *
1372  * ixgb_xmit_frame is called to send an skb on the wire.
1373  * @param skb contains data to send
1374  * @param netdev network interface device structure
1375  **/
1376
1377 static int
1378 ixgb_xmit_frame(struct sk_buff *skb, struct net_device *netdev)
1379 {
1380         struct ixgb_adapter *adapter = netdev->priv;
1381         int vlan_id = 0;
1382         int tx_flags = 0, count;
1383         int f;
1384
1385         count =
1386             TXD_USE_COUNT(skb->len - skb->data_len, adapter->max_data_per_txd);
1387
1388         if (count == 0) {
1389                 dev_kfree_skb_any(skb);
1390                 return 0;
1391         }
1392
1393         for (f = 0; f < skb_shinfo(skb)->nr_frags; f++)
1394                 count += TXD_USE_COUNT(skb_shinfo(skb)->frags[f].size,
1395                                        adapter->max_data_per_txd);
1396 #ifdef NETIF_F_TSO
1397         if ((skb_shinfo(skb)->tso_size) || (skb->ip_summed == CHECKSUM_HW))
1398                 count++;
1399 #else
1400         if (skb->ip_summed == CHECKSUM_HW)
1401                 count++;
1402 #endif
1403
1404         if (unlikely(IXGB_DESC_UNUSED(&adapter->tx_ring) < count)) {
1405                 netif_stop_queue(netdev);
1406                 return 1;
1407         }
1408
1409         if (adapter->vlgrp && vlan_tx_tag_present(skb)) {
1410                 tx_flags |= IXGB_TX_FLAGS_VLAN;
1411                 vlan_id = vlan_tx_tag_get(skb);
1412         }
1413
1414         if (ixgb_tso(adapter, skb))
1415                 tx_flags |= IXGB_TX_FLAGS_TSO;
1416         else if (ixgb_tx_csum(adapter, skb))
1417                 tx_flags |= IXGB_TX_FLAGS_CSUM;
1418
1419         count = ixgb_tx_map(adapter, skb);
1420         ixgb_tx_queue(adapter, count, vlan_id, tx_flags);
1421         netdev->trans_start = jiffies;
1422
1423         return 0;
1424 }
1425
1426 /**
1427  * ixgb_tx_timeout - Respond to a Tx Hang by resetting the adapter.
1428  * @param netdev network interface device structure
1429  **/
1430
1431 static void
1432 ixgb_tx_timeout(struct net_device *netdev)
1433 {
1434         struct ixgb_adapter *adapter = netdev->priv;
1435
1436         IXGB_DBG("ixgb_tx_timeout\n");
1437
1438         /* Do the reset outside of interrupt context */
1439         schedule_work(&adapter->tx_timeout_task);
1440 }
1441
1442 /**
1443  * ixgb_tx_timeout_task - worker function to reset hardware and dump queues.
1444  * This function is pointed to by adapter->tx_timeout_task
1445  *
1446  * @param netdev network interface device structure
1447  **/
1448
1449 static void
1450 ixgb_tx_timeout_task(struct net_device *netdev)
1451 {
1452         struct ixgb_adapter *adapter = netdev->priv;
1453
1454         IXGB_DBG("ixgb_tx_timeout_task\n");
1455
1456         netif_device_detach(netdev);
1457         ixgb_down(adapter, TRUE);
1458         ixgb_up(adapter);
1459         netif_device_attach(netdev);
1460 }
1461
1462 /**
1463  * ixgb_get_stats - Get System Network Statistics.
1464  * @param netdev network interface device structure
1465  *
1466  * Returns the address of the device statistics structure.
1467  * The statistics are actually updated from the timer callback.
1468  **/
1469
1470 static struct net_device_stats *
1471 ixgb_get_stats(struct net_device *netdev)
1472 {
1473         struct ixgb_adapter *adapter = netdev->priv;
1474
1475         return &adapter->net_stats;
1476 }
1477
1478 /**
1479  * ixgb_change_mtu - Change the Maximum Transfer Unit.
1480  * @param netdev network interface device structure
1481  * @param new_mtu new value for maximum frame size
1482  *
1483  * Returns 0 on success, negative on failure
1484  **/
1485
1486 static int
1487 ixgb_change_mtu(struct net_device *netdev, int new_mtu)
1488 {
1489         struct ixgb_adapter *adapter = netdev->priv;
1490         u32 old_mtu = adapter->rx_buffer_len;
1491         int max_frame = new_mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;
1492
1493         IXGB_DBG("ixgb_change_mtu\n");
1494
1495         if ((max_frame < IXGB_MIN_ENET_FRAME_SIZE_WITHOUT_FCS + ENET_FCS_LENGTH)
1496             || (max_frame > IXGB_MAX_JUMBO_FRAME_SIZE + ENET_FCS_LENGTH)) {
1497                 IXGB_ERR("Invalid MTU setting\n");
1498                 return -EINVAL;
1499         }
1500
1501         if ((max_frame <=
1502              IXGB_MAX_ENET_FRAME_SIZE_WITHOUT_FCS + ENET_FCS_LENGTH)
1503             || (max_frame <= IXGB_RXBUFFER_2048)) {
1504                 adapter->rx_buffer_len = IXGB_RXBUFFER_2048;
1505
1506         } else if (max_frame <= IXGB_RXBUFFER_4096) {
1507                 adapter->rx_buffer_len = IXGB_RXBUFFER_4096;
1508
1509         } else if (max_frame <= IXGB_RXBUFFER_8192) {
1510                 adapter->rx_buffer_len = IXGB_RXBUFFER_8192;
1511
1512         } else {
1513                 adapter->rx_buffer_len = IXGB_RXBUFFER_16384;
1514         }
1515
1516         if (old_mtu != adapter->rx_buffer_len && netif_running(netdev)) {
1517
1518                 ixgb_down(adapter, TRUE);
1519                 ixgb_up(adapter);
1520         }
1521
1522         if (adapter->hw.max_frame_size != max_frame) {
1523                 struct ixgb_hw *hw = &adapter->hw;
1524
1525                 adapter->hw.max_frame_size = max_frame;
1526
1527                 IXGB_WRITE_REG(hw, MFS, hw->max_frame_size << IXGB_MFS_SHIFT);
1528
1529                 if (hw->max_frame_size >
1530                     IXGB_MAX_ENET_FRAME_SIZE_WITHOUT_FCS + ENET_FCS_LENGTH) {
1531                         u32 ctrl0 = IXGB_READ_REG(hw, CTRL0);
1532
1533                         if (!(ctrl0 & IXGB_CTRL0_JFE)) {
1534                                 ctrl0 |= IXGB_CTRL0_JFE;
1535                                 IXGB_WRITE_REG(hw, CTRL0, ctrl0);
1536                         }
1537                 }
1538
1539                 printk(KERN_ERR "%s: ixgb_change_mtu MFS is set to <%x>\n",
1540                        adapter->netdev->name,
1541                        (IXGB_READ_REG(hw, MFS) >> IXGB_MFS_SHIFT));
1542         }
1543
1544         netdev->mtu = new_mtu;
1545
1546         return 0;
1547 }
1548
1549 /**
1550  * ixgb_set_mac - Change the Ethernet Address of the NIC.
1551  * @param netdev network interface device structure
1552  * @param p pointer to an address structure
1553  *
1554  * Returns 0 on success, negative on failure
1555  **/
1556
1557 static int
1558 ixgb_set_mac(struct net_device *netdev, void *p)
1559 {
1560         struct ixgb_adapter *adapter = netdev->priv;
1561         struct sockaddr *addr = (struct sockaddr *) p;
1562
1563         IXGB_DBG("ixgb_set_mac\n");
1564
1565         memcpy(netdev->dev_addr, addr->sa_data, netdev->addr_len);
1566
1567         ixgb_rar_set(&adapter->hw, addr->sa_data, 0);
1568
1569         return 0;
1570 }
1571
1572 /**
1573  * ixgb_update_stats - Update the board statistics counters.
1574  * @param adapter board private structure
1575  **/
1576
1577 static void
1578 ixgb_update_stats(struct ixgb_adapter *adapter)
1579 {
1580         adapter->stats.tprl += IXGB_READ_REG(&adapter->hw, TPRL);
1581         adapter->stats.tprh += IXGB_READ_REG(&adapter->hw, TPRH);
1582         adapter->stats.gprcl += IXGB_READ_REG(&adapter->hw, GPRCL);
1583         adapter->stats.gprch += IXGB_READ_REG(&adapter->hw, GPRCH);
1584         adapter->stats.bprcl += IXGB_READ_REG(&adapter->hw, BPRCL);
1585         adapter->stats.bprch += IXGB_READ_REG(&adapter->hw, BPRCH);
1586         adapter->stats.mprcl += IXGB_READ_REG(&adapter->hw, MPRCL);
1587         adapter->stats.mprch += IXGB_READ_REG(&adapter->hw, MPRCH);
1588         adapter->stats.uprcl += IXGB_READ_REG(&adapter->hw, UPRCL);
1589         adapter->stats.uprch += IXGB_READ_REG(&adapter->hw, UPRCH);
1590         adapter->stats.vprcl += IXGB_READ_REG(&adapter->hw, VPRCL);
1591         adapter->stats.vprch += IXGB_READ_REG(&adapter->hw, VPRCH);
1592         adapter->stats.jprcl += IXGB_READ_REG(&adapter->hw, JPRCL);
1593         adapter->stats.jprch += IXGB_READ_REG(&adapter->hw, JPRCH);
1594         adapter->stats.gorcl += IXGB_READ_REG(&adapter->hw, GORCL);
1595         adapter->stats.gorch += IXGB_READ_REG(&adapter->hw, GORCH);
1596         adapter->stats.torl += IXGB_READ_REG(&adapter->hw, TORL);
1597         adapter->stats.torh += IXGB_READ_REG(&adapter->hw, TORH);
1598         adapter->stats.rnbc += IXGB_READ_REG(&adapter->hw, RNBC);
1599         adapter->stats.ruc += IXGB_READ_REG(&adapter->hw, RUC);
1600         adapter->stats.roc += IXGB_READ_REG(&adapter->hw, ROC);
1601         adapter->stats.rlec += IXGB_READ_REG(&adapter->hw, RLEC);
1602         adapter->stats.crcerrs += IXGB_READ_REG(&adapter->hw, CRCERRS);
1603         adapter->stats.icbc += IXGB_READ_REG(&adapter->hw, ICBC);
1604         adapter->stats.ecbc += IXGB_READ_REG(&adapter->hw, ECBC);
1605         adapter->stats.mpc += IXGB_READ_REG(&adapter->hw, MPC);
1606         adapter->stats.tptl += IXGB_READ_REG(&adapter->hw, TPTL);
1607         adapter->stats.tpth += IXGB_READ_REG(&adapter->hw, TPTH);
1608         adapter->stats.gptcl += IXGB_READ_REG(&adapter->hw, GPTCL);
1609         adapter->stats.gptch += IXGB_READ_REG(&adapter->hw, GPTCH);
1610         adapter->stats.bptcl += IXGB_READ_REG(&adapter->hw, BPTCL);
1611         adapter->stats.bptch += IXGB_READ_REG(&adapter->hw, BPTCH);
1612         adapter->stats.mptcl += IXGB_READ_REG(&adapter->hw, MPTCL);
1613         adapter->stats.mptch += IXGB_READ_REG(&adapter->hw, MPTCH);
1614         adapter->stats.uptcl += IXGB_READ_REG(&adapter->hw, UPTCL);
1615         adapter->stats.uptch += IXGB_READ_REG(&adapter->hw, UPTCH);
1616         adapter->stats.vptcl += IXGB_READ_REG(&adapter->hw, VPTCL);
1617         adapter->stats.vptch += IXGB_READ_REG(&adapter->hw, VPTCH);
1618         adapter->stats.jptcl += IXGB_READ_REG(&adapter->hw, JPTCL);
1619         adapter->stats.jptch += IXGB_READ_REG(&adapter->hw, JPTCH);
1620         adapter->stats.gotcl += IXGB_READ_REG(&adapter->hw, GOTCL);
1621         adapter->stats.gotch += IXGB_READ_REG(&adapter->hw, GOTCH);
1622         adapter->stats.totl += IXGB_READ_REG(&adapter->hw, TOTL);
1623         adapter->stats.toth += IXGB_READ_REG(&adapter->hw, TOTH);
1624         adapter->stats.dc += IXGB_READ_REG(&adapter->hw, DC);
1625         adapter->stats.plt64c += IXGB_READ_REG(&adapter->hw, PLT64C);
1626         adapter->stats.tsctc += IXGB_READ_REG(&adapter->hw, TSCTC);
1627         adapter->stats.tsctfc += IXGB_READ_REG(&adapter->hw, TSCTFC);
1628         adapter->stats.ibic += IXGB_READ_REG(&adapter->hw, IBIC);
1629         adapter->stats.rfc += IXGB_READ_REG(&adapter->hw, RFC);
1630         adapter->stats.lfc += IXGB_READ_REG(&adapter->hw, LFC);
1631         adapter->stats.pfrc += IXGB_READ_REG(&adapter->hw, PFRC);
1632         adapter->stats.pftc += IXGB_READ_REG(&adapter->hw, PFTC);
1633         adapter->stats.mcfrc += IXGB_READ_REG(&adapter->hw, MCFRC);
1634         adapter->stats.mcftc += IXGB_READ_REG(&adapter->hw, MCFTC);
1635         adapter->stats.xonrxc += IXGB_READ_REG(&adapter->hw, XONRXC);
1636         adapter->stats.xontxc += IXGB_READ_REG(&adapter->hw, XONTXC);
1637         adapter->stats.xoffrxc += IXGB_READ_REG(&adapter->hw, XOFFRXC);
1638         adapter->stats.xofftxc += IXGB_READ_REG(&adapter->hw, XOFFTXC);
1639         adapter->stats.rjc += IXGB_READ_REG(&adapter->hw, RJC);
1640
1641         /* Fill out the OS statistics structure */
1642
1643         adapter->net_stats.rx_packets = adapter->stats.gprcl;
1644         adapter->net_stats.tx_packets = adapter->stats.gptcl;
1645         adapter->net_stats.rx_bytes = adapter->stats.gorcl;
1646         adapter->net_stats.tx_bytes = adapter->stats.gotcl;
1647         adapter->net_stats.multicast = adapter->stats.mprcl;
1648         adapter->net_stats.collisions = 0;
1649
1650         /* ignore RLEC as it reports errors for padded (<64bytes) frames
1651          * with a length in the type/len field */
1652         adapter->net_stats.rx_errors =
1653             /* adapter->stats.rnbc + */ adapter->stats.crcerrs +
1654             adapter->stats.ruc +
1655             adapter->stats.roc /*+ adapter->stats.rlec */  +
1656             adapter->stats.icbc +
1657             adapter->stats.ecbc + adapter->stats.mpc;
1658
1659         adapter->net_stats.rx_dropped = adapter->stats.mpc;
1660
1661         /* see above
1662          * adapter->net_stats.rx_length_errors = adapter->stats.rlec;
1663          */
1664
1665         adapter->net_stats.rx_crc_errors = adapter->stats.crcerrs;
1666         adapter->net_stats.rx_fifo_errors = adapter->stats.mpc;
1667         adapter->net_stats.rx_missed_errors = adapter->stats.mpc;
1668         adapter->net_stats.rx_over_errors = adapter->stats.mpc;
1669
1670         adapter->net_stats.tx_errors = 0;
1671         adapter->net_stats.rx_frame_errors = 0;
1672         adapter->net_stats.tx_aborted_errors = 0;
1673         adapter->net_stats.tx_carrier_errors = 0;
1674         adapter->net_stats.tx_fifo_errors = 0;
1675         adapter->net_stats.tx_heartbeat_errors = 0;
1676         adapter->net_stats.tx_window_errors = 0;
1677 }
1678
1679 /**
1680  * ixgb_irq_disable - Mask off interrupt generation on the NIC
1681  * @param adapter board private structure
1682  **/
1683
1684 static inline void
1685 ixgb_irq_disable(struct ixgb_adapter *adapter)
1686 {
1687         IXGB_DBG("ixgb_irq_disable\n");
1688
1689         atomic_inc(&adapter->irq_sem);
1690         IXGB_WRITE_REG(&adapter->hw, IMC, ~0);
1691         synchronize_irq(adapter->netdev->irq);
1692 }
1693
1694 /**
1695  * ixgb_irq_enable - Enable default interrupt generation settings.
1696  * @param adapter board private structure
1697  **/
1698
1699 static inline void
1700 ixgb_irq_enable(struct ixgb_adapter *adapter)
1701 {
1702         IXGB_DBG("ixgb_irq_enable\n");
1703
1704         if (atomic_dec_and_test(&adapter->irq_sem)) {
1705                 IXGB_WRITE_REG(&adapter->hw, IMS,
1706                                IXGB_INT_RXT0 | IXGB_INT_RXDMT0 | IXGB_INT_TXDW |
1707                                IXGB_INT_RXO | IXGB_INT_LSC);
1708         }
1709 }
1710
1711 #define IXGB_MAX_INTR 10
1712 /**
1713  * ixgb_intr - Interrupt Handler.
1714  * @param irq interrupt number
1715  * @param data pointer to a network interface device structure
1716  * @param regs CPU registers structure
1717  **/
1718
1719 static irqreturn_t
1720 ixgb_intr(int irq, void *data, struct pt_regs *regs)
1721 {
1722         struct net_device *netdev = (struct net_device *) data;
1723         struct ixgb_adapter *adapter = netdev->priv;
1724 #ifdef CONFIG_IXGB_NAPI
1725         if (netif_rx_schedule_prep(netdev)) {
1726                 ixgb_irq_disable(adapter);
1727                 __netif_rx_schedule(netdev);
1728         }
1729
1730         return IRQ_HANDLED; /* FIXME: check for shared interrupts */
1731 #else
1732         struct ixgb_hw *hw = &adapter->hw;
1733         u32 icr;
1734         uint i = IXGB_MAX_INTR;
1735         boolean_t rxdmt0 = FALSE;
1736         int handled = 0;
1737
1738         while (i && (icr = IXGB_READ_REG(hw, ICR))) {
1739                 handled = 1;
1740
1741                 if (icr & IXGB_INT_RXDMT0)
1742                         rxdmt0 = TRUE;
1743
1744                 if (unlikely(icr & (IXGB_INT_RXSEQ | IXGB_INT_LSC))) {
1745                         mod_timer(&adapter->watchdog_timer, jiffies);
1746                 }
1747
1748                 /* adapter->generate_int = 0; */
1749                 ixgb_clean_rx_irq(adapter);
1750                 ixgb_clean_tx_irq(adapter);
1751
1752                 i--;
1753         }
1754
1755         /* if RAIDC:EN == 1 and ICR:RXDMT0 == 1, we need to
1756          * set IMS:RXDMT0 to 1 to restart the RBD timer (POLL)
1757          */
1758         if (rxdmt0 && adapter->raidc) {
1759                 /* ready the timer by writing the clear reg */
1760                 IXGB_WRITE_REG(hw, IMC, IXGB_INT_RXDMT0);
1761                 /* now restart it, h/w will decide if its necessary */
1762                 IXGB_WRITE_REG(hw, IMS, IXGB_INT_RXDMT0);
1763         }
1764
1765         return IRQ_RETVAL(handled);
1766 #endif                          // NAPI else
1767 }
1768
1769 #ifdef CONFIG_IXGB_NAPI
1770 static int
1771 ixgb_process_intr(struct net_device *netdev)
1772 {
1773         struct ixgb_adapter *adapter = netdev->priv;
1774         u32 icr;
1775         int i = IXGB_MAX_INTR;
1776         int hasReceived = 0;
1777
1778         while (i && (icr = IXGB_READ_REG(&adapter->hw, ICR))) {
1779                 if (icr & IXGB_INT_RXT0)
1780                         hasReceived = 1;
1781
1782                 if (!(icr & ~(IXGB_INT_RXT0)))
1783                         break;
1784
1785                 if (icr & (IXGB_INT_RXSEQ | IXGB_INT_LSC)) {
1786                         mod_timer(&adapter->watchdog_timer, jiffies);
1787                 }
1788
1789                 ixgb_clean_tx_irq(adapter);
1790                 i--;
1791         }
1792
1793         return hasReceived;
1794 }
1795
1796 #endif
1797 /**
1798  * ixgb_clean_tx_irq - Reclaim resources after transmit completes.
1799  * @param adapter board private structure
1800  **/
1801
1802 static void
1803 ixgb_clean_tx_irq(struct ixgb_adapter *adapter)
1804 {
1805         struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
1806         struct net_device *netdev = adapter->netdev;
1807         struct pci_dev *pdev = adapter->pdev;
1808         int i = adapter->tx_ring.next_to_clean;
1809         struct ixgb_tx_desc *tx_desc = IXGB_TX_DESC(*tx_ring, i);
1810         while ((tx_desc->status & IXGB_TX_DESC_STATUS_DD)) {
1811                 if (tx_desc->popts
1812                     & (IXGB_TX_DESC_POPTS_TXSM | IXGB_TX_DESC_POPTS_IXSM))
1813                         adapter->hw_csum_tx_good++;
1814
1815                 if (tx_ring->buffer_info[i].dma) {
1816                         pci_unmap_page(pdev, tx_ring->buffer_info[i].dma,
1817                                        tx_ring->buffer_info[i].length,
1818                                        PCI_DMA_TODEVICE);
1819                         tx_ring->buffer_info[i].dma = 0;
1820                 }
1821
1822                 if (tx_ring->buffer_info[i].skb) {
1823                         dev_kfree_skb_any(tx_ring->buffer_info[i].skb);
1824                         tx_ring->buffer_info[i].skb = NULL;
1825                 }
1826
1827                 *(u32 *) & (tx_desc->status) = 0;
1828
1829                 i = (i + 1) % tx_ring->count;
1830                 tx_desc = IXGB_TX_DESC(*tx_ring, i);
1831         }
1832
1833         tx_ring->next_to_clean = i;
1834
1835         if (netif_queue_stopped(netdev) && netif_carrier_ok(netdev) &&
1836             (IXGB_DESC_UNUSED(tx_ring) > IXGB_TX_QUEUE_WAKE)) {
1837
1838                 netif_wake_queue(netdev);
1839         }
1840 }
1841
1842 #ifdef CONFIG_IXGB_NAPI
1843 static int
1844 ixgb_poll(struct net_device *netdev, int *budget)
1845 {
1846         struct ixgb_adapter *adapter = netdev->priv;
1847         struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
1848         struct pci_dev *pdev = adapter->pdev;
1849         struct ixgb_rx_desc *rx_desc;
1850         struct sk_buff *skb;
1851         u32 length;
1852         int i;
1853         int received = 0;
1854         int rx_work_limit = *budget;
1855
1856         if (rx_work_limit > netdev->quota)
1857                 rx_work_limit = netdev->quota;
1858
1859         ixgb_process_intr(netdev);
1860
1861         i = rx_ring->next_to_clean;
1862         rx_desc = IXGB_RX_DESC(*rx_ring, i);
1863
1864         while ((rx_desc->status & IXGB_RX_DESC_STATUS_DD)) {
1865                 if (--rx_work_limit < 0)
1866                         goto not_done;
1867
1868                 pci_unmap_single(pdev,
1869                                  rx_ring->buffer_info[i].dma,
1870                                  rx_ring->buffer_info[i].length,
1871                                  PCI_DMA_FROMDEVICE);
1872
1873                 skb = rx_ring->buffer_info[i].skb;
1874                 length = le16_to_cpu(rx_desc->length);
1875
1876                 if (!(rx_desc->status & IXGB_RX_DESC_STATUS_EOP)) {
1877
1878                         /* All receives must fit into a single buffer */
1879
1880                         IXGB_DBG("Receive packet consumed multiple buffers\n");
1881
1882                         dev_kfree_skb_irq(skb);
1883                         rx_desc->status = 0;
1884                         rx_ring->buffer_info[i].skb = NULL;
1885
1886                         i = (i + 1) % rx_ring->count;
1887
1888                         rx_desc = IXGB_RX_DESC(*rx_ring, i);
1889                         continue;
1890                 }
1891
1892                 if (rx_desc->
1893                     errors & (IXGB_RX_DESC_ERRORS_CE | IXGB_RX_DESC_ERRORS_SE |
1894                               IXGB_RX_DESC_ERRORS_P | IXGB_RX_DESC_ERRORS_RXE))
1895                 {
1896
1897                         IXGB_DBG("Receive Errors Reported by Hardware-%x.\n",
1898                                  rx_desc->errors);
1899
1900                         dev_kfree_skb_irq(skb);
1901                         rx_desc->status = 0;
1902                         rx_ring->buffer_info[i].skb = NULL;
1903                         i = (i + 1) % rx_ring->count;
1904                         rx_desc = IXGB_RX_DESC(*rx_ring, i);
1905                         continue;
1906                 }
1907
1908                 /* Good Receive */
1909                 skb_put(skb, length);
1910
1911                 /* Receive Checksum Offload */
1912                 ixgb_rx_checksum(adapter, rx_desc, skb);
1913
1914                 skb->protocol = eth_type_trans(skb, netdev);
1915                 if (adapter->vlgrp
1916                     && (rx_desc->status & IXGB_RX_DESC_STATUS_VP)) {
1917                         vlan_hwaccel_receive_skb(skb, adapter->vlgrp,
1918                                 (rx_desc-> special & IXGB_RX_DESC_SPECIAL_VLAN_MASK));
1919                 } else {
1920                         netif_receive_skb(skb);
1921                 }
1922                 netdev->last_rx = jiffies;
1923
1924                 rx_desc->status = 0;
1925                 rx_ring->buffer_info[i].skb = NULL;
1926
1927                 i = (i + 1) % rx_ring->count;
1928
1929                 rx_desc = IXGB_RX_DESC(*rx_ring, i);
1930                 received++;
1931         }
1932
1933         if (!received)
1934                 received = 1;
1935
1936         ixgb_alloc_rx_buffers(adapter);
1937
1938         rx_ring->next_to_clean = i;
1939         netdev->quota -= received;
1940         *budget -= received;
1941
1942         netif_rx_complete(netdev);
1943
1944         /* NOTE: RAIDC will be automatically restarted by this enable */
1945         ixgb_irq_enable(adapter);
1946         return 0;
1947
1948       not_done:
1949
1950         ixgb_alloc_rx_buffers(adapter);
1951
1952         rx_ring->next_to_clean = i;
1953         netdev->quota -= received;
1954         *budget -= received;
1955
1956         return 1;
1957 }
1958 #else
1959 /**
1960  * ixgb_clean_rx_irq - Send received data up the network stack.
1961  * @param adapter board private structure
1962  **/
1963
1964 static void
1965 ixgb_clean_rx_irq(struct ixgb_adapter *adapter)
1966 {
1967         struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
1968         struct net_device *netdev = adapter->netdev;
1969         struct pci_dev *pdev = adapter->pdev;
1970         struct ixgb_rx_desc *rx_desc;
1971         struct sk_buff *skb;
1972         u32 length;
1973         int i;
1974
1975         i = rx_ring->next_to_clean;
1976         rx_desc = IXGB_RX_DESC(*rx_ring, i);
1977
1978         while ((rx_desc->status & IXGB_RX_DESC_STATUS_DD)) {
1979                 pci_unmap_single(pdev, rx_ring->buffer_info[i].dma,
1980                                  rx_ring->buffer_info[i].length,
1981                                  PCI_DMA_FROMDEVICE);
1982
1983                 skb = rx_ring->buffer_info[i].skb;
1984                 length = le16_to_cpu(rx_desc->length);
1985
1986                 if (unlikely(!(rx_desc->status & IXGB_RX_DESC_STATUS_EOP))) {
1987
1988                         /* All receives must fit into a single buffer */
1989
1990                         IXGB_DBG("Receive packet consumed multiple buffers "
1991                                  "length<%x>\n", length);
1992
1993                         dev_kfree_skb_irq(skb);
1994                         rx_desc->status = 0;
1995                         rx_ring->buffer_info[i].skb = NULL;
1996                         i = (i + 1) % rx_ring->count;
1997                         rx_desc = IXGB_RX_DESC(*rx_ring, i);
1998                         continue;
1999                 }
2000
2001                 if (unlikely(rx_desc->errors
2002                              & (IXGB_RX_DESC_ERRORS_CE | IXGB_RX_DESC_ERRORS_SE
2003                                 | IXGB_RX_DESC_ERRORS_P |
2004                                 IXGB_RX_DESC_ERRORS_RXE))) {
2005
2006                         IXGB_DBG("Receive Errors Reported by Hardware-%x.\n",
2007                                  rx_desc->errors);
2008
2009                         dev_kfree_skb_irq(skb);
2010                         rx_desc->status = 0;
2011                         rx_ring->buffer_info[i].skb = NULL;
2012                         i = (i + 1) % rx_ring->count;
2013                         rx_desc = IXGB_RX_DESC(*rx_ring, i);
2014                         continue;
2015                 }
2016
2017                 /* Good Receive */
2018                 skb_put(skb, length);
2019
2020                 /* Receive Checksum Offload */
2021                 ixgb_rx_checksum(adapter, rx_desc, skb);
2022
2023                 skb->protocol = eth_type_trans(skb, netdev);
2024                 if (adapter->vlgrp
2025                     && (rx_desc->status & IXGB_RX_DESC_STATUS_VP)) {
2026                         vlan_hwaccel_rx(skb, adapter->vlgrp,
2027                                         (rx_desc->
2028                                          special &
2029                                          IXGB_RX_DESC_SPECIAL_VLAN_MASK));
2030                 } else {
2031                         netif_rx(skb);
2032                 }
2033
2034                 netdev->last_rx = jiffies;
2035
2036                 rx_desc->status = 0;
2037
2038                 rx_ring->buffer_info[i].skb = NULL;
2039                 i = (i + 1) % rx_ring->count;
2040
2041                 rx_desc = IXGB_RX_DESC(*rx_ring, i);
2042         }                       /* while */
2043
2044         rx_ring->next_to_clean = i;
2045
2046         ixgb_alloc_rx_buffers(adapter);
2047 }
2048 #endif
2049
2050 /**
2051  * ixgb_alloc_rx_buffers - Replace used receive buffers.
2052  * @param adapter address of board private structure
2053  **/
2054
2055 static void
2056 ixgb_alloc_rx_buffers(struct ixgb_adapter *adapter)
2057 {
2058         struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
2059         struct net_device *netdev = adapter->netdev;
2060         struct pci_dev *pdev = adapter->pdev;
2061         struct ixgb_rx_desc *rx_desc;
2062         struct sk_buff *skb;
2063         int reserve_len;
2064         int i;
2065         int num_group_tail_writes;
2066         long cleancount;
2067
2068         reserve_len = 2;
2069
2070         i = rx_ring->next_to_use;
2071         cleancount = IXGB_DESC_UNUSED(rx_ring);
2072
2073         /* lessen this to 4 if we're
2074          * in the midst of raidc and rbd is occuring
2075          * because we don't want to delay returning buffers when low
2076          */
2077         num_group_tail_writes = adapter->raidc ? 4 : IXGB_RX_BUFFER_WRITE;
2078
2079         /* leave one descriptor unused */
2080         while (--cleancount > 0) {
2081                 rx_desc = IXGB_RX_DESC(*rx_ring, i);
2082
2083                 /* allocate a new one */
2084                 skb = dev_alloc_skb(adapter->rx_buffer_len + reserve_len);
2085
2086                 if (unlikely(!skb)) {
2087                         /* better luck next time around */
2088                         IXGB_DBG("Could not allocate SKB\n");
2089                         break;
2090                 }
2091                 /* Make buffer alignment 2 beyond a 16 byte boundary
2092                  * this will result in a 16 byte aligned IP header after
2093                  * the 14 byte MAC header is removed
2094                  */
2095                 skb_reserve(skb, reserve_len);
2096
2097                 skb->dev = netdev;
2098
2099                 rx_ring->buffer_info[i].skb = skb;
2100                 rx_ring->buffer_info[i].length = adapter->rx_buffer_len;
2101                 rx_ring->buffer_info[i].dma =
2102                     pci_map_single(pdev, skb->data, adapter->rx_buffer_len,
2103                                    PCI_DMA_FROMDEVICE);
2104
2105                 rx_desc->buff_addr = cpu_to_le64(rx_ring->buffer_info[i].dma);
2106
2107                 if (!(i % num_group_tail_writes)) {
2108                         /* Force memory writes to complete before letting h/w
2109                          * know there are new descriptors to fetch.  (Only
2110                          * applicable for weak-ordered memory model archs,
2111                          * such as IA-64). */
2112                         wmb();
2113                         /* move tail */
2114                         IXGB_WRITE_REG(&adapter->hw, RDT, i);
2115                 }
2116                 i = (i + 1) % rx_ring->count;
2117         }
2118
2119         rx_ring->next_to_use = i;
2120 }
2121
2122 /**
2123  * ixgb_ioctl - perform a command - e.g: ethtool:get_driver_info.
2124  * @param netdev network interface device structure
2125  * @param ifr data to be used/filled in by the ioctl command
2126  * @param cmd ioctl command to execute
2127  **/
2128
2129 int
2130 ixgb_ioctl(struct net_device *netdev, struct ifreq *ifr, int cmd)
2131 {
2132
2133         switch (cmd) {
2134         case SIOCETHTOOL:
2135                 return ixgb_ethtool_ioctl(netdev, ifr);
2136
2137         default:
2138                 return -EOPNOTSUPP;
2139         }
2140
2141         return 0;
2142 }
2143
2144 /**
2145  * ixgb_vlan_rx_register - enables or disables vlan tagging/stripping.
2146  *
2147  * @param netdev network interface device structure
2148  * @param grp indicates to enable or disable tagging/stripping
2149  **/
2150
2151 static void
2152 ixgb_vlan_rx_register(struct net_device *netdev, struct vlan_group *grp)
2153 {
2154         struct ixgb_adapter *adapter = netdev->priv;
2155         u32 ctrl, rctl;
2156
2157         ixgb_irq_disable(adapter);
2158         adapter->vlgrp = grp;
2159
2160         if (grp) {
2161                 /* enable VLAN tag insert/strip */
2162                 ctrl = IXGB_READ_REG(&adapter->hw, CTRL0);
2163                 ctrl |= IXGB_CTRL0_VME;
2164                 IXGB_WRITE_REG(&adapter->hw, CTRL0, ctrl);
2165
2166                 /* enable VLAN receive filtering */
2167                 rctl = IXGB_READ_REG(&adapter->hw, RCTL);
2168                 rctl |= IXGB_RCTL_VFE;
2169                 rctl &= ~IXGB_RCTL_CFIEN;
2170                 IXGB_WRITE_REG(&adapter->hw, RCTL, rctl);
2171         } else {
2172                 /* disable VLAN tag insert/strip */
2173                 ctrl = IXGB_READ_REG(&adapter->hw, CTRL0);
2174                 ctrl &= ~IXGB_CTRL0_VME;
2175                 IXGB_WRITE_REG(&adapter->hw, CTRL0, ctrl);
2176
2177                 /* disable VLAN filtering */
2178                 rctl = IXGB_READ_REG(&adapter->hw, RCTL);
2179                 rctl &= ~IXGB_RCTL_VFE;
2180                 IXGB_WRITE_REG(&adapter->hw, RCTL, rctl);
2181         }
2182
2183         ixgb_irq_enable(adapter);
2184 }
2185
2186 /**
2187  * ixgb_vlan_rx_add_vid - adds a vlan id to be tagged/stripped in packet data.
2188  * @param netdev network interface device structure
2189  * @param vid the vlan to be added
2190  **/
2191
2192 static void
2193 ixgb_vlan_rx_add_vid(struct net_device *netdev, u16 vid)
2194 {
2195         struct ixgb_adapter *adapter = netdev->priv;
2196         u32 vfta, index;
2197
2198         /* add VID to filter table */
2199
2200         index = (vid >> 5) & 0x7F;
2201         vfta = IXGB_READ_REG_ARRAY(&adapter->hw, VFTA, index);
2202         vfta |= (1 << (vid & 0x1F));
2203         ixgb_write_vfta(&adapter->hw, index, vfta);
2204 }
2205
2206 /**
2207  * ixgb_vlan_rx_kill_vid - removes a vlan id from tag/strip tables.
2208  * @param netdev network interface device structure
2209  * @param vid the vlan to be deleted
2210  **/
2211
2212 static void
2213 ixgb_vlan_rx_kill_vid(struct net_device *netdev, u16 vid)
2214 {
2215         struct ixgb_adapter *adapter = netdev->priv;
2216         u32 vfta, index;
2217
2218         ixgb_irq_disable(adapter);
2219
2220         if (adapter->vlgrp)
2221                 adapter->vlgrp->vlan_devices[vid] = NULL;
2222
2223         ixgb_irq_enable(adapter);
2224
2225         /* remove VID from filter table */
2226
2227         index = (vid >> 5) & 0x7F;
2228         vfta = IXGB_READ_REG_ARRAY(&adapter->hw, VFTA, index);
2229         vfta &= ~(1 << (vid & 0x1F));
2230         ixgb_write_vfta(&adapter->hw, index, vfta);
2231 }
2232
2233 /**
2234  * ixgb_restore_vlan - restores vlan settings after adapter reset.
2235  * @param adapter the address of the board private structure
2236  **/
2237 static void
2238 ixgb_restore_vlan(struct ixgb_adapter *adapter)
2239 {
2240         ixgb_vlan_rx_register(adapter->netdev, adapter->vlgrp);
2241
2242         if (adapter->vlgrp) {
2243                 u16 vid;
2244                 for (vid = 0; vid < VLAN_GROUP_ARRAY_LEN; vid++) {
2245                         if (!adapter->vlgrp->vlan_devices[vid])
2246                                 continue;
2247                         ixgb_vlan_rx_add_vid(adapter->netdev, vid);
2248                 }
2249         }
2250 }
2251
2252 /**
2253  * ixgb_rx_checksum - Receive Checksum Offload for 82597.
2254  * @param adapter board private structure
2255  * @param rx_desc receive descriptor
2256  * @param skb socket buffer with received data
2257  **/
2258
2259 static inline void
2260 ixgb_rx_checksum(struct ixgb_adapter *adapter,
2261                  struct ixgb_rx_desc *rx_desc, struct sk_buff *skb)
2262 {
2263         /* Ignore Checksum bit is set OR
2264          * TCP Checksum has not been calculated
2265          */
2266         if ((rx_desc->status & IXGB_RX_DESC_STATUS_IXSM) ||
2267             (!(rx_desc->status & IXGB_RX_DESC_STATUS_TCPCS))) {
2268                 skb->ip_summed = CHECKSUM_NONE;
2269                 return;
2270         }
2271
2272         /* At this point we know the hardware did the TCP checksum
2273          * now look at the TCP checksum error bit
2274          */
2275         if (rx_desc->errors & IXGB_RX_DESC_ERRORS_TCPE) {
2276                 /* let the stack verify checksum errors */
2277                 skb->ip_summed = CHECKSUM_NONE;
2278                 adapter->hw_csum_rx_error++;
2279         } else {
2280                 /* TCP checksum is good */
2281                 skb->ip_summed = CHECKSUM_UNNECESSARY;
2282                 adapter->hw_csum_rx_good++;
2283         }
2284 }
2285
2286 /**
2287  * ixgb_write_pci_cfg - write PCI configuration space.
2288  * @param hw board specific data structure
2289  * @param reg PCI configuration space register to write to
2290  * @param value Value to be written to reg
2291  **/
2292
2293 void
2294 ixgb_write_pci_cfg(struct ixgb_hw *hw, u32 reg, u16 * value)
2295 {
2296         struct ixgb_adapter *adapter = (struct ixgb_adapter *) hw->back;
2297
2298         pci_write_config_word(adapter->pdev, reg, *value);
2299 }
2300
2301 /**
2302  * ixgb_notify_reboot - handles OS notification of reboot event.
2303  * @param nb notifier block, unused
2304  * @param event Event being passed to driver to act upon
2305  * @param p A pointer to our net device
2306  **/
2307 static int
2308 ixgb_notify_reboot(struct notifier_block *nb, unsigned long event, void *p)
2309 {
2310         struct pci_dev *pdev = NULL;
2311
2312         switch (event) {
2313         case SYS_DOWN:
2314         case SYS_HALT:
2315         case SYS_POWER_OFF:
2316                 while ((pdev = pci_find_device(PCI_ANY_ID, PCI_ANY_ID, pdev)) != NULL) {
2317                         if (pci_dev_driver(pdev) == &ixgb_driver)
2318                                 ixgb_suspend(pdev, 3);
2319                 }
2320         }
2321         return NOTIFY_DONE;
2322 }
2323
2324 /**
2325  * ixgb_suspend - driver suspend function called from notify.
2326  * @param pdev pci driver structure used for passing to
2327  * @param state power state to enter
2328  **/
2329 static int
2330 ixgb_suspend(struct pci_dev *pdev, u32 state)
2331 {
2332         struct net_device *netdev = pci_get_drvdata(pdev);
2333         struct ixgb_adapter *adapter = netdev->priv;
2334
2335         netif_device_detach(netdev);
2336
2337         if (netif_running(netdev))
2338                 ixgb_down(adapter, TRUE);
2339
2340         pci_save_state(pdev, adapter->pci_state);
2341
2342         state = (state > 0) ? 3 : 0;
2343         pci_set_power_state(pdev, state);
2344         msec_delay(200);
2345
2346         return 0;
2347 }
2348
2349 /* ixgb_main.c */