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   1 /*******************************************************************************
   2
   3
   4   Copyright(c) 1999 - 2005 Intel Corporation. All rights reserved.
   5
   6   This program is free software; you can redistribute it and/or modify it
   7   under the terms of the GNU General Public License as published by the Free
   8   Software Foundation; either version 2 of the License, or (at your option)
   9   any later version.
  10
  11   This program is distributed in the hope that it will be useful, but WITHOUT
  12   ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13   FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  14   more details.
  15
  16   You should have received a copy of the GNU General Public License along with
  17   this program; if not, write to the Free Software Foundation, Inc., 59
  18   Temple Place - Suite 330, Boston, MA  02111-1307, USA.
  19
  20   The full GNU General Public License is included in this distribution in the
  21   file called LICENSE.
  22
  23   Contact Information:
  24   Linux NICS <linux.nics@intel.com>
  25   Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
  26
  27 *******************************************************************************/
  28
  29 #include "ixgb.h"
  30
  31 /* Change Log
  32  * 1.0.96 04/19/05
  33  * - Make needlessly global code static -- bunk@stusta.de
  34  * - ethtool cleanup -- shemminger@osdl.org
  35  * - Support for MODULE_VERSION -- linville@tuxdriver.com
  36  * - add skb_header_cloned check to the tso path -- herbert@apana.org.au
  37  * 1.0.88 01/05/05
  38  * - include fix to the condition that determines when to quit NAPI - Robert Olsson
  39  * - use netif_poll_{disable/enable} to synchronize between NAPI and i/f up/down
  40  * 1.0.84 10/26/04
  41  * - reset buffer_info->dma in Tx resource cleanup logic
  42  * 1.0.83 10/12/04
  43  * - sparse cleanup - shemminger@osdl.org
  44  * - fix tx resource cleanup logic
  45  */
  46
  47 char ixgb_driver_name[] = "ixgb";
  48 static char ixgb_driver_string[] = "Intel(R) PRO/10GbE Network Driver";
  49
  50 #ifndef CONFIG_IXGB_NAPI
  51 #define DRIVERNAPI
  52 #else
  53 #define DRIVERNAPI "-NAPI"
  54 #endif
  55 #define DRV_VERSION             "1.0.104-k4"DRIVERNAPI
  56 char ixgb_driver_version[] = DRV_VERSION;
  57 static char ixgb_copyright[] = "Copyright (c) 1999-2005 Intel Corporation.";
  58
  59 /* ixgb_pci_tbl - PCI Device ID Table
  60  *
  61  * Wildcard entries (PCI_ANY_ID) should come last
  62  * Last entry must be all 0s
  63  *
  64  * { Vendor ID, Device ID, SubVendor ID, SubDevice ID,
  65  *   Class, Class Mask, private data (not used) }
  66  */
  67 static struct pci_device_id ixgb_pci_tbl[] = {
  68         {INTEL_VENDOR_ID, IXGB_DEVICE_ID_82597EX,
  69          PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
  70         {INTEL_VENDOR_ID, IXGB_DEVICE_ID_82597EX_CX4,
  71          PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
  72         {INTEL_VENDOR_ID, IXGB_DEVICE_ID_82597EX_SR,
  73          PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
  74         {INTEL_VENDOR_ID, IXGB_DEVICE_ID_82597EX_LR,
  75          PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
  76
  77         /* required last entry */
  78         {0,}
  79 };
  80
  81 MODULE_DEVICE_TABLE(pci, ixgb_pci_tbl);
  82
  83 /* Local Function Prototypes */
  84
  85 int ixgb_up(struct ixgb_adapter *adapter);
  86 void ixgb_down(struct ixgb_adapter *adapter, boolean_t kill_watchdog);
  87 void ixgb_reset(struct ixgb_adapter *adapter);
  88 int ixgb_setup_tx_resources(struct ixgb_adapter *adapter);
  89 int ixgb_setup_rx_resources(struct ixgb_adapter *adapter);
  90 void ixgb_free_tx_resources(struct ixgb_adapter *adapter);
  91 void ixgb_free_rx_resources(struct ixgb_adapter *adapter);
  92 void ixgb_update_stats(struct ixgb_adapter *adapter);
  93
  94 static int ixgb_init_module(void);
  95 static void ixgb_exit_module(void);
  96 static int ixgb_probe(struct pci_dev *pdev, const struct pci_device_id *ent);
  97 static void __devexit ixgb_remove(struct pci_dev *pdev);
  98 static int ixgb_sw_init(struct ixgb_adapter *adapter);
  99 static int ixgb_open(struct net_device *netdev);
 100 static int ixgb_close(struct net_device *netdev);
 101 static void ixgb_configure_tx(struct ixgb_adapter *adapter);
 102 static void ixgb_configure_rx(struct ixgb_adapter *adapter);
 103 static void ixgb_setup_rctl(struct ixgb_adapter *adapter);
 104 static void ixgb_clean_tx_ring(struct ixgb_adapter *adapter);
 105 static void ixgb_clean_rx_ring(struct ixgb_adapter *adapter);
 106 static void ixgb_set_multi(struct net_device *netdev);
 107 static void ixgb_watchdog(unsigned long data);
 108 static int ixgb_xmit_frame(struct sk_buff *skb, struct net_device *netdev);
 109 static struct net_device_stats *ixgb_get_stats(struct net_device *netdev);
 110 static int ixgb_change_mtu(struct net_device *netdev, int new_mtu);
 111 static int ixgb_set_mac(struct net_device *netdev, void *p);
 112 static irqreturn_t ixgb_intr(int irq, void *data, struct pt_regs *regs);
 113 static boolean_t ixgb_clean_tx_irq(struct ixgb_adapter *adapter);
 114
 115 #ifdef CONFIG_IXGB_NAPI
 116 static int ixgb_clean(struct net_device *netdev, int *budget);
 117 static boolean_t ixgb_clean_rx_irq(struct ixgb_adapter *adapter,
 118                                    int *work_done, int work_to_do);
 119 #else
 120 static boolean_t ixgb_clean_rx_irq(struct ixgb_adapter *adapter);
 121 #endif
 122 static void ixgb_alloc_rx_buffers(struct ixgb_adapter *adapter);
 123 void ixgb_set_ethtool_ops(struct net_device *netdev);
 124 static void ixgb_tx_timeout(struct net_device *dev);
 125 static void ixgb_tx_timeout_task(struct net_device *dev);
 126 static void ixgb_vlan_rx_register(struct net_device *netdev,
 127                                   struct vlan_group *grp);
 128 static void ixgb_vlan_rx_add_vid(struct net_device *netdev, uint16_t vid);
 129 static void ixgb_vlan_rx_kill_vid(struct net_device *netdev, uint16_t vid);
 130 static void ixgb_restore_vlan(struct ixgb_adapter *adapter);
 131
 132 #ifdef CONFIG_NET_POLL_CONTROLLER
 133 /* for netdump / net console */
 134 static void ixgb_netpoll(struct net_device *dev);
 135 #endif
 136
 137 /* Exported from other modules */
 138
 139 extern void ixgb_check_options(struct ixgb_adapter *adapter);
 140
 141 static struct pci_driver ixgb_driver = {
 142         .name     = ixgb_driver_name,
 143         .id_table = ixgb_pci_tbl,
 144         .probe    = ixgb_probe,
 145         .remove   = __devexit_p(ixgb_remove),
 146 };
 147
 148 MODULE_AUTHOR("Intel Corporation, <linux.nics@intel.com>");
 149 MODULE_DESCRIPTION("Intel(R) PRO/10GbE Network Driver");
 150 MODULE_LICENSE("GPL");
 151 MODULE_VERSION(DRV_VERSION);
 152
 153 #define DEFAULT_DEBUG_LEVEL_SHIFT 3
 154 static int debug = DEFAULT_DEBUG_LEVEL_SHIFT;
 155 module_param(debug, int, 0);
 156 MODULE_PARM_DESC(debug, "Debug level (0=none,...,16=all)");
 157
 158 /* some defines for controlling descriptor fetches in h/w */
 159 #define RXDCTL_WTHRESH_DEFAULT 16       /* chip writes back at this many or RXT0 */
 160 #define RXDCTL_PTHRESH_DEFAULT 0                /* chip considers prefech below
 161                                                  * this */
 162 #define RXDCTL_HTHRESH_DEFAULT 0                /* chip will only prefetch if tail
 163                                                  * is pushed this many descriptors
 164                                                  * from head */
 165
 166 /**
 167  * ixgb_init_module - Driver Registration Routine
 168  *
 169  * ixgb_init_module is the first routine called when the driver is
 170  * loaded. All it does is register with the PCI subsystem.
 171  **/
 172
 173 static int __init
 174 ixgb_init_module(void)
 175 {
 176         printk(KERN_INFO "%s - version %s\n",
 177                ixgb_driver_string, ixgb_driver_version);
 178
 179         printk(KERN_INFO "%s\n", ixgb_copyright);
 180
 181         return pci_module_init(&ixgb_driver);
 182 }
 183
 184 module_init(ixgb_init_module);
 185
 186 /**
 187  * ixgb_exit_module - Driver Exit Cleanup Routine
 188  *
 189  * ixgb_exit_module is called just before the driver is removed
 190  * from memory.
 191  **/
 192
 193 static void __exit
 194 ixgb_exit_module(void)
 195 {
 196         pci_unregister_driver(&ixgb_driver);
 197 }
 198
 199 module_exit(ixgb_exit_module);
 200
 201 /**
 202  * ixgb_irq_disable - Mask off interrupt generation on the NIC
 203  * @adapter: board private structure
 204  **/
 205
 206 static inline void
 207 ixgb_irq_disable(struct ixgb_adapter *adapter)
 208 {
 209         atomic_inc(&adapter->irq_sem);
 210         IXGB_WRITE_REG(&adapter->hw, IMC, ~0);
 211         IXGB_WRITE_FLUSH(&adapter->hw);
 212         synchronize_irq(adapter->pdev->irq);
 213 }
 214
 215 /**
 216  * ixgb_irq_enable - Enable default interrupt generation settings
 217  * @adapter: board private structure
 218  **/
 219
 220 static inline void
 221 ixgb_irq_enable(struct ixgb_adapter *adapter)
 222 {
 223         if(atomic_dec_and_test(&adapter->irq_sem)) {
 224                 IXGB_WRITE_REG(&adapter->hw, IMS,
 225                                IXGB_INT_RXT0 | IXGB_INT_RXDMT0 | IXGB_INT_TXDW |
 226                                IXGB_INT_LSC);
 227                 IXGB_WRITE_FLUSH(&adapter->hw);
 228         }
 229 }
 230
 231 int
 232 ixgb_up(struct ixgb_adapter *adapter)
 233 {
 234         struct net_device *netdev = adapter->netdev;
 235         int err;
 236         int max_frame = netdev->mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;
 237         struct ixgb_hw *hw = &adapter->hw;
 238
 239         /* hardware has been reset, we need to reload some things */
 240
 241         ixgb_set_multi(netdev);
 242
 243         ixgb_restore_vlan(adapter);
 244
 245         ixgb_configure_tx(adapter);
 246         ixgb_setup_rctl(adapter);
 247         ixgb_configure_rx(adapter);
 248         ixgb_alloc_rx_buffers(adapter);
 249
 250         /* disable interrupts and get the hardware into a known state */
 251         IXGB_WRITE_REG(&adapter->hw, IMC, 0xffffffff);
 252
 253 #ifdef CONFIG_PCI_MSI
 254         {
 255         boolean_t pcix = (IXGB_READ_REG(&adapter->hw, STATUS) &
 256                                                   IXGB_STATUS_PCIX_MODE) ? TRUE : FALSE;
 257         adapter->have_msi = TRUE;
 258
 259         if (!pcix)
 260            adapter->have_msi = FALSE;
 261         else if((err = pci_enable_msi(adapter->pdev))) {
 262                 DPRINTK(PROBE, ERR,
 263                  "Unable to allocate MSI interrupt Error: %d\n", err);
 264                 adapter->have_msi = FALSE;
 265                 /* proceed to try to request regular interrupt */
 266         }
 267         }
 268
 269 #endif
 270         if((err = request_irq(adapter->pdev->irq, &ixgb_intr,
 271                                   SA_SHIRQ | SA_SAMPLE_RANDOM,
 272                                   netdev->name, netdev))) {
 273                 DPRINTK(PROBE, ERR,
 274                  "Unable to allocate interrupt Error: %d\n", err);
 275                 return err;
 276         }
 277
 278         if((hw->max_frame_size != max_frame) ||
 279                 (hw->max_frame_size !=
 280                 (IXGB_READ_REG(hw, MFS) >> IXGB_MFS_SHIFT))) {
 281
 282                 hw->max_frame_size = max_frame;
 283
 284                 IXGB_WRITE_REG(hw, MFS, hw->max_frame_size << IXGB_MFS_SHIFT);
 285
 286                 if(hw->max_frame_size >
 287                    IXGB_MAX_ENET_FRAME_SIZE_WITHOUT_FCS + ENET_FCS_LENGTH) {
 288                         uint32_t ctrl0 = IXGB_READ_REG(hw, CTRL0);
 289
 290                         if(!(ctrl0 & IXGB_CTRL0_JFE)) {
 291                                 ctrl0 |= IXGB_CTRL0_JFE;
 292                                 IXGB_WRITE_REG(hw, CTRL0, ctrl0);
 293                         }
 294                 }
 295         }
 296
 297         mod_timer(&adapter->watchdog_timer, jiffies);
 298
 299 #ifdef CONFIG_IXGB_NAPI
 300         netif_poll_enable(netdev);
 301 #endif
 302         ixgb_irq_enable(adapter);
 303
 304         return 0;
 305 }
 306
 307 void
 308 ixgb_down(struct ixgb_adapter *adapter, boolean_t kill_watchdog)
 309 {
 310         struct net_device *netdev = adapter->netdev;
 311
 312         ixgb_irq_disable(adapter);
 313         free_irq(adapter->pdev->irq, netdev);
 314 #ifdef CONFIG_PCI_MSI
 315         if(adapter->have_msi == TRUE)
 316                 pci_disable_msi(adapter->pdev);
 317
 318 #endif
 319         if(kill_watchdog)
 320                 del_timer_sync(&adapter->watchdog_timer);
 321 #ifdef CONFIG_IXGB_NAPI
 322         netif_poll_disable(netdev);
 323 #endif
 324         adapter->link_speed = 0;
 325         adapter->link_duplex = 0;
 326         netif_carrier_off(netdev);
 327         netif_stop_queue(netdev);
 328
 329         ixgb_reset(adapter);
 330         ixgb_clean_tx_ring(adapter);
 331         ixgb_clean_rx_ring(adapter);
 332 }
 333
 334 void
 335 ixgb_reset(struct ixgb_adapter *adapter)
 336 {
 337
 338         ixgb_adapter_stop(&adapter->hw);
 339         if(!ixgb_init_hw(&adapter->hw))
 340                 DPRINTK(PROBE, ERR, "ixgb_init_hw failed.\n");
 341 }
 342
 343 /**
 344  * ixgb_probe - Device Initialization Routine
 345  * @pdev: PCI device information struct
 346  * @ent: entry in ixgb_pci_tbl
 347  *
 348  * Returns 0 on success, negative on failure
 349  *
 350  * ixgb_probe initializes an adapter identified by a pci_dev structure.
 351  * The OS initialization, configuring of the adapter private structure,
 352  * and a hardware reset occur.
 353  **/
 354
 355 static int __devinit
 356 ixgb_probe(struct pci_dev *pdev,
 357                 const struct pci_device_id *ent)
 358 {
 359         struct net_device *netdev = NULL;
 360         struct ixgb_adapter *adapter;
 361         static int cards_found = 0;
 362         unsigned long mmio_start;
 363         int mmio_len;
 364         int pci_using_dac;
 365         int i;
 366         int err;
 367
 368         if((err = pci_enable_device(pdev)))
 369                 return err;
 370
 371         if(!(err = pci_set_dma_mask(pdev, DMA_64BIT_MASK)) &&
 372            !(err = pci_set_consistent_dma_mask(pdev, DMA_64BIT_MASK))) {
 373                 pci_using_dac = 1;
 374         } else {
 375                 if((err = pci_set_dma_mask(pdev, DMA_32BIT_MASK)) ||
 376                    (err = pci_set_consistent_dma_mask(pdev, DMA_32BIT_MASK))) {
 377                         printk(KERN_ERR
 378                          "ixgb: No usable DMA configuration, aborting\n");
 379                         goto err_dma_mask;
 380                 }
 381                 pci_using_dac = 0;
 382         }
 383
 384         if((err = pci_request_regions(pdev, ixgb_driver_name)))
 385                 goto err_request_regions;
 386
 387         pci_set_master(pdev);
 388
 389         netdev = alloc_etherdev(sizeof(struct ixgb_adapter));
 390         if(!netdev) {
 391                 err = -ENOMEM;
 392                 goto err_alloc_etherdev;
 393         }
 394
 395         SET_MODULE_OWNER(netdev);
 396         SET_NETDEV_DEV(netdev, &pdev->dev);
 397
 398         pci_set_drvdata(pdev, netdev);
 399         adapter = netdev_priv(netdev);
 400         adapter->netdev = netdev;
 401         adapter->pdev = pdev;
 402         adapter->hw.back = adapter;
 403         adapter->msg_enable = netif_msg_init(debug, DEFAULT_DEBUG_LEVEL_SHIFT);
 404
 405         mmio_start = pci_resource_start(pdev, BAR_0);
 406         mmio_len = pci_resource_len(pdev, BAR_0);
 407
 408         adapter->hw.hw_addr = ioremap(mmio_start, mmio_len);
 409         if(!adapter->hw.hw_addr) {
 410                 err = -EIO;
 411                 goto err_ioremap;
 412         }
 413
 414         for(i = BAR_1; i <= BAR_5; i++) {
 415                 if(pci_resource_len(pdev, i) == 0)
 416                         continue;
 417                 if(pci_resource_flags(pdev, i) & IORESOURCE_IO) {
 418                         adapter->hw.io_base = pci_resource_start(pdev, i);
 419                         break;
 420                 }
 421         }
 422
 423         netdev->open = &ixgb_open;
 424         netdev->stop = &ixgb_close;
 425         netdev->hard_start_xmit = &ixgb_xmit_frame;
 426         netdev->get_stats = &ixgb_get_stats;
 427         netdev->set_multicast_list = &ixgb_set_multi;
 428         netdev->set_mac_address = &ixgb_set_mac;
 429         netdev->change_mtu = &ixgb_change_mtu;
 430         ixgb_set_ethtool_ops(netdev);
 431         netdev->tx_timeout = &ixgb_tx_timeout;
 432         netdev->watchdog_timeo = 5 * HZ;
 433 #ifdef CONFIG_IXGB_NAPI
 434         netdev->poll = &ixgb_clean;
 435         netdev->weight = 64;
 436 #endif
 437         netdev->vlan_rx_register = ixgb_vlan_rx_register;
 438         netdev->vlan_rx_add_vid = ixgb_vlan_rx_add_vid;
 439         netdev->vlan_rx_kill_vid = ixgb_vlan_rx_kill_vid;
 440 #ifdef CONFIG_NET_POLL_CONTROLLER
 441         netdev->poll_controller = ixgb_netpoll;
 442 #endif
 443
 444         strcpy(netdev->name, pci_name(pdev));
 445         netdev->mem_start = mmio_start;
 446         netdev->mem_end = mmio_start + mmio_len;
 447         netdev->base_addr = adapter->hw.io_base;
 448
 449         adapter->bd_number = cards_found;
 450         adapter->link_speed = 0;
 451         adapter->link_duplex = 0;
 452
 453         /* setup the private structure */
 454
 455         if((err = ixgb_sw_init(adapter)))
 456                 goto err_sw_init;
 457
 458         netdev->features = NETIF_F_SG |
 459                            NETIF_F_HW_CSUM |
 460                            NETIF_F_HW_VLAN_TX |
 461                            NETIF_F_HW_VLAN_RX |
 462                            NETIF_F_HW_VLAN_FILTER;
 463 #ifdef NETIF_F_TSO
 464         netdev->features |= NETIF_F_TSO;
 465 #endif
 466 #ifdef NETIF_F_LLTX
 467         netdev->features |= NETIF_F_LLTX;
 468 #endif
 469
 470         if(pci_using_dac)
 471                 netdev->features |= NETIF_F_HIGHDMA;
 472
 473         /* make sure the EEPROM is good */
 474
 475         if(!ixgb_validate_eeprom_checksum(&adapter->hw)) {
 476                 DPRINTK(PROBE, ERR, "The EEPROM Checksum Is Not Valid\n");
 477                 err = -EIO;
 478                 goto err_eeprom;
 479         }
 480
 481         ixgb_get_ee_mac_addr(&adapter->hw, netdev->dev_addr);
 482         memcpy(netdev->perm_addr, netdev->dev_addr, netdev->addr_len);
 483
 484         if(!is_valid_ether_addr(netdev->perm_addr)) {
 485                 DPRINTK(PROBE, ERR, "Invalid MAC Address\n");
 486                 err = -EIO;
 487                 goto err_eeprom;
 488         }
 489
 490         adapter->part_num = ixgb_get_ee_pba_number(&adapter->hw);
 491
 492         init_timer(&adapter->watchdog_timer);
 493         adapter->watchdog_timer.function = &ixgb_watchdog;
 494         adapter->watchdog_timer.data = (unsigned long)adapter;
 495
 496         INIT_WORK(&adapter->tx_timeout_task,
 497                   (void (*)(void *))ixgb_tx_timeout_task, netdev);
 498
 499         strcpy(netdev->name, "eth%d");
 500         if((err = register_netdev(netdev)))
 501                 goto err_register;
 502
 503         /* we're going to reset, so assume we have no link for now */
 504
 505         netif_carrier_off(netdev);
 506         netif_stop_queue(netdev);
 507
 508         DPRINTK(PROBE, INFO, "Intel(R) PRO/10GbE Network Connection\n");
 509         ixgb_check_options(adapter);
 510         /* reset the hardware with the new settings */
 511
 512         ixgb_reset(adapter);
 513
 514         cards_found++;
 515         return 0;
 516
 517 err_register:
 518 err_sw_init:
 519 err_eeprom:
 520         iounmap(adapter->hw.hw_addr);
 521 err_ioremap:
 522         free_netdev(netdev);
 523 err_alloc_etherdev:
 524         pci_release_regions(pdev);
 525 err_request_regions:
 526 err_dma_mask:
 527         pci_disable_device(pdev);
 528         return err;
 529 }
 530
 531 /**
 532  * ixgb_remove - Device Removal Routine
 533  * @pdev: PCI device information struct
 534  *
 535  * ixgb_remove is called by the PCI subsystem to alert the driver
 536  * that it should release a PCI device.  The could be caused by a
 537  * Hot-Plug event, or because the driver is going to be removed from
 538  * memory.
 539  **/
 540
 541 static void __devexit
 542 ixgb_remove(struct pci_dev *pdev)
 543 {
 544         struct net_device *netdev = pci_get_drvdata(pdev);
 545         struct ixgb_adapter *adapter = netdev_priv(netdev);
 546
 547         unregister_netdev(netdev);
 548
 549         iounmap(adapter->hw.hw_addr);
 550         pci_release_regions(pdev);
 551
 552         free_netdev(netdev);
 553 }
 554
 555 /**
 556  * ixgb_sw_init - Initialize general software structures (struct ixgb_adapter)
 557  * @adapter: board private structure to initialize
 558  *
 559  * ixgb_sw_init initializes the Adapter private data structure.
 560  * Fields are initialized based on PCI device information and
 561  * OS network device settings (MTU size).
 562  **/
 563
 564 static int __devinit
 565 ixgb_sw_init(struct ixgb_adapter *adapter)
 566 {
 567         struct ixgb_hw *hw = &adapter->hw;
 568         struct net_device *netdev = adapter->netdev;
 569         struct pci_dev *pdev = adapter->pdev;
 570
 571         /* PCI config space info */
 572
 573         hw->vendor_id = pdev->vendor;
 574         hw->device_id = pdev->device;
 575         hw->subsystem_vendor_id = pdev->subsystem_vendor;
 576         hw->subsystem_id = pdev->subsystem_device;
 577
 578         adapter->rx_buffer_len = IXGB_RXBUFFER_2048;
 579
 580         hw->max_frame_size = netdev->mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;
 581
 582         if((hw->device_id == IXGB_DEVICE_ID_82597EX)
 583            || (hw->device_id == IXGB_DEVICE_ID_82597EX_CX4)
 584            || (hw->device_id == IXGB_DEVICE_ID_82597EX_LR)
 585            || (hw->device_id == IXGB_DEVICE_ID_82597EX_SR))
 586                         hw->mac_type = ixgb_82597;
 587         else {
 588                 /* should never have loaded on this device */
 589                 DPRINTK(PROBE, ERR, "unsupported device id\n");
 590         }
 591
 592         /* enable flow control to be programmed */
 593         hw->fc.send_xon = 1;
 594
 595         atomic_set(&adapter->irq_sem, 1);
 596         spin_lock_init(&adapter->tx_lock);
 597
 598         return 0;
 599 }
 600
 601 /**
 602  * ixgb_open - Called when a network interface is made active
 603  * @netdev: network interface device structure
 604  *
 605  * Returns 0 on success, negative value on failure
 606  *
 607  * The open entry point is called when a network interface is made
 608  * active by the system (IFF_UP).  At this point all resources needed
 609  * for transmit and receive operations are allocated, the interrupt
 610  * handler is registered with the OS, the watchdog timer is started,
 611  * and the stack is notified that the interface is ready.
 612  **/
 613
 614 static int
 615 ixgb_open(struct net_device *netdev)
 616 {
 617         struct ixgb_adapter *adapter = netdev_priv(netdev);
 618         int err;
 619
 620         /* allocate transmit descriptors */
 621
 622         if((err = ixgb_setup_tx_resources(adapter)))
 623                 goto err_setup_tx;
 624
 625         /* allocate receive descriptors */
 626
 627         if((err = ixgb_setup_rx_resources(adapter)))
 628                 goto err_setup_rx;
 629
 630         if((err = ixgb_up(adapter)))
 631                 goto err_up;
 632
 633         return 0;
 634
 635 err_up:
 636         ixgb_free_rx_resources(adapter);
 637 err_setup_rx:
 638         ixgb_free_tx_resources(adapter);
 639 err_setup_tx:
 640         ixgb_reset(adapter);
 641
 642         return err;
 643 }
 644
 645 /**
 646  * ixgb_close - Disables a network interface
 647  * @netdev: network interface device structure
 648  *
 649  * Returns 0, this is not allowed to fail
 650  *
 651  * The close entry point is called when an interface is de-activated
 652  * by the OS.  The hardware is still under the drivers control, but
 653  * needs to be disabled.  A global MAC reset is issued to stop the
 654  * hardware, and all transmit and receive resources are freed.
 655  **/
 656
 657 static int
 658 ixgb_close(struct net_device *netdev)
 659 {
 660         struct ixgb_adapter *adapter = netdev_priv(netdev);
 661
 662         ixgb_down(adapter, TRUE);
 663
 664         ixgb_free_tx_resources(adapter);
 665         ixgb_free_rx_resources(adapter);
 666
 667         return 0;
 668 }
 669
 670 /**
 671  * ixgb_setup_tx_resources - allocate Tx resources (Descriptors)
 672  * @adapter: board private structure
 673  *
 674  * Return 0 on success, negative on failure
 675  **/
 676
 677 int
 678 ixgb_setup_tx_resources(struct ixgb_adapter *adapter)
 679 {
 680         struct ixgb_desc_ring *txdr = &adapter->tx_ring;
 681         struct pci_dev *pdev = adapter->pdev;
 682         int size;
 683
 684         size = sizeof(struct ixgb_buffer) * txdr->count;
 685         txdr->buffer_info = vmalloc(size);
 686         if(!txdr->buffer_info) {
 687                 DPRINTK(PROBE, ERR,
 688                  "Unable to allocate transmit descriptor ring memory\n");
 689                 return -ENOMEM;
 690         }
 691         memset(txdr->buffer_info, 0, size);
 692
 693         /* round up to nearest 4K */
 694
 695         txdr->size = txdr->count * sizeof(struct ixgb_tx_desc);
 696         IXGB_ROUNDUP(txdr->size, 4096);
 697
 698         txdr->desc = pci_alloc_consistent(pdev, txdr->size, &txdr->dma);
 699         if(!txdr->desc) {
 700                 vfree(txdr->buffer_info);
 701                 DPRINTK(PROBE, ERR,
 702                  "Unable to allocate transmit descriptor memory\n");
 703                 return -ENOMEM;
 704         }
 705         memset(txdr->desc, 0, txdr->size);
 706
 707         txdr->next_to_use = 0;
 708         txdr->next_to_clean = 0;
 709
 710         return 0;
 711 }
 712
 713 /**
 714  * ixgb_configure_tx - Configure 82597 Transmit Unit after Reset.
 715  * @adapter: board private structure
 716  *
 717  * Configure the Tx unit of the MAC after a reset.
 718  **/
 719
 720 static void
 721 ixgb_configure_tx(struct ixgb_adapter *adapter)
 722 {
 723         uint64_t tdba = adapter->tx_ring.dma;
 724         uint32_t tdlen = adapter->tx_ring.count * sizeof(struct ixgb_tx_desc);
 725         uint32_t tctl;
 726         struct ixgb_hw *hw = &adapter->hw;
 727
 728         /* Setup the Base and Length of the Tx Descriptor Ring
 729          * tx_ring.dma can be either a 32 or 64 bit value
 730          */
 731
 732         IXGB_WRITE_REG(hw, TDBAL, (tdba & 0x00000000ffffffffULL));
 733         IXGB_WRITE_REG(hw, TDBAH, (tdba >> 32));
 734
 735         IXGB_WRITE_REG(hw, TDLEN, tdlen);
 736
 737         /* Setup the HW Tx Head and Tail descriptor pointers */
 738
 739         IXGB_WRITE_REG(hw, TDH, 0);
 740         IXGB_WRITE_REG(hw, TDT, 0);
 741
 742         /* don't set up txdctl, it induces performance problems if configured
 743          * incorrectly */
 744         /* Set the Tx Interrupt Delay register */
 745
 746         IXGB_WRITE_REG(hw, TIDV, adapter->tx_int_delay);
 747
 748         /* Program the Transmit Control Register */
 749
 750         tctl = IXGB_TCTL_TCE | IXGB_TCTL_TXEN | IXGB_TCTL_TPDE;
 751         IXGB_WRITE_REG(hw, TCTL, tctl);
 752
 753         /* Setup Transmit Descriptor Settings for this adapter */
 754         adapter->tx_cmd_type =
 755                 IXGB_TX_DESC_TYPE
 756                 | (adapter->tx_int_delay_enable ? IXGB_TX_DESC_CMD_IDE : 0);
 757 }
 758
 759 /**
 760  * ixgb_setup_rx_resources - allocate Rx resources (Descriptors)
 761  * @adapter: board private structure
 762  *
 763  * Returns 0 on success, negative on failure
 764  **/
 765
 766 int
 767 ixgb_setup_rx_resources(struct ixgb_adapter *adapter)
 768 {
 769         struct ixgb_desc_ring *rxdr = &adapter->rx_ring;
 770         struct pci_dev *pdev = adapter->pdev;
 771         int size;
 772
 773         size = sizeof(struct ixgb_buffer) * rxdr->count;
 774         rxdr->buffer_info = vmalloc(size);
 775         if(!rxdr->buffer_info) {
 776                 DPRINTK(PROBE, ERR,
 777                  "Unable to allocate receive descriptor ring\n");
 778                 return -ENOMEM;
 779         }
 780         memset(rxdr->buffer_info, 0, size);
 781
 782         /* Round up to nearest 4K */
 783
 784         rxdr->size = rxdr->count * sizeof(struct ixgb_rx_desc);
 785         IXGB_ROUNDUP(rxdr->size, 4096);
 786
 787         rxdr->desc = pci_alloc_consistent(pdev, rxdr->size, &rxdr->dma);
 788
 789         if(!rxdr->desc) {
 790                 vfree(rxdr->buffer_info);
 791                 DPRINTK(PROBE, ERR,
 792                  "Unable to allocate receive descriptors\n");
 793                 return -ENOMEM;
 794         }
 795         memset(rxdr->desc, 0, rxdr->size);
 796
 797         rxdr->next_to_clean = 0;
 798         rxdr->next_to_use = 0;
 799
 800         return 0;
 801 }
 802
 803 /**
 804  * ixgb_setup_rctl - configure the receive control register
 805  * @adapter: Board private structure
 806  **/
 807
 808 static void
 809 ixgb_setup_rctl(struct ixgb_adapter *adapter)
 810 {
 811         uint32_t rctl;
 812
 813         rctl = IXGB_READ_REG(&adapter->hw, RCTL);
 814
 815         rctl &= ~(3 << IXGB_RCTL_MO_SHIFT);
 816
 817         rctl |=
 818                 IXGB_RCTL_BAM | IXGB_RCTL_RDMTS_1_2 |
 819                 IXGB_RCTL_RXEN | IXGB_RCTL_CFF |
 820                 (adapter->hw.mc_filter_type << IXGB_RCTL_MO_SHIFT);
 821
 822         rctl |= IXGB_RCTL_SECRC;
 823
 824         switch (adapter->rx_buffer_len) {
 825         case IXGB_RXBUFFER_2048:
 826         default:
 827                 rctl |= IXGB_RCTL_BSIZE_2048;
 828                 break;
 829         case IXGB_RXBUFFER_4096:
 830                 rctl |= IXGB_RCTL_BSIZE_4096;
 831                 break;
 832         case IXGB_RXBUFFER_8192:
 833                 rctl |= IXGB_RCTL_BSIZE_8192;
 834                 break;
 835         case IXGB_RXBUFFER_16384:
 836                 rctl |= IXGB_RCTL_BSIZE_16384;
 837                 break;
 838         }
 839
 840         IXGB_WRITE_REG(&adapter->hw, RCTL, rctl);
 841 }
 842
 843 /**
 844  * ixgb_configure_rx - Configure 82597 Receive Unit after Reset.
 845  * @adapter: board private structure
 846  *
 847  * Configure the Rx unit of the MAC after a reset.
 848  **/
 849
 850 static void
 851 ixgb_configure_rx(struct ixgb_adapter *adapter)
 852 {
 853         uint64_t rdba = adapter->rx_ring.dma;
 854         uint32_t rdlen = adapter->rx_ring.count * sizeof(struct ixgb_rx_desc);
 855         struct ixgb_hw *hw = &adapter->hw;
 856         uint32_t rctl;
 857         uint32_t rxcsum;
 858         uint32_t rxdctl;
 859
 860         /* make sure receives are disabled while setting up the descriptors */
 861
 862         rctl = IXGB_READ_REG(hw, RCTL);
 863         IXGB_WRITE_REG(hw, RCTL, rctl & ~IXGB_RCTL_RXEN);
 864
 865         /* set the Receive Delay Timer Register */
 866
 867         IXGB_WRITE_REG(hw, RDTR, adapter->rx_int_delay);
 868
 869         /* Setup the Base and Length of the Rx Descriptor Ring */
 870
 871         IXGB_WRITE_REG(hw, RDBAL, (rdba & 0x00000000ffffffffULL));
 872         IXGB_WRITE_REG(hw, RDBAH, (rdba >> 32));
 873
 874         IXGB_WRITE_REG(hw, RDLEN, rdlen);
 875
 876         /* Setup the HW Rx Head and Tail Descriptor Pointers */
 877         IXGB_WRITE_REG(hw, RDH, 0);
 878         IXGB_WRITE_REG(hw, RDT, 0);
 879
 880         /* set up pre-fetching of receive buffers so we get some before we
 881          * run out (default hardware behavior is to run out before fetching
 882          * more).  This sets up to fetch if HTHRESH rx descriptors are avail
 883          * and the descriptors in hw cache are below PTHRESH.  This avoids
 884          * the hardware behavior of fetching <=512 descriptors in a single
 885          * burst that pre-empts all other activity, usually causing fifo
 886          * overflows. */
 887         /* use WTHRESH to burst write 16 descriptors or burst when RXT0 */
 888         rxdctl = RXDCTL_WTHRESH_DEFAULT << IXGB_RXDCTL_WTHRESH_SHIFT |
 889                  RXDCTL_HTHRESH_DEFAULT << IXGB_RXDCTL_HTHRESH_SHIFT |
 890                  RXDCTL_PTHRESH_DEFAULT << IXGB_RXDCTL_PTHRESH_SHIFT;
 891         IXGB_WRITE_REG(hw, RXDCTL, rxdctl);
 892
 893         /* Enable Receive Checksum Offload for TCP and UDP */
 894         if(adapter->rx_csum == TRUE) {
 895                 rxcsum = IXGB_READ_REG(hw, RXCSUM);
 896                 rxcsum |= IXGB_RXCSUM_TUOFL;
 897                 IXGB_WRITE_REG(hw, RXCSUM, rxcsum);
 898         }
 899
 900         /* Enable Receives */
 901
 902         IXGB_WRITE_REG(hw, RCTL, rctl);
 903 }
 904
 905 /**
 906  * ixgb_free_tx_resources - Free Tx Resources
 907  * @adapter: board private structure
 908  *
 909  * Free all transmit software resources
 910  **/
 911
 912 void
 913 ixgb_free_tx_resources(struct ixgb_adapter *adapter)
 914 {
 915         struct pci_dev *pdev = adapter->pdev;
 916
 917         ixgb_clean_tx_ring(adapter);
 918
 919         vfree(adapter->tx_ring.buffer_info);
 920         adapter->tx_ring.buffer_info = NULL;
 921
 922         pci_free_consistent(pdev, adapter->tx_ring.size,
 923                             adapter->tx_ring.desc, adapter->tx_ring.dma);
 924
 925         adapter->tx_ring.desc = NULL;
 926 }
 927
 928 static inline void
 929 ixgb_unmap_and_free_tx_resource(struct ixgb_adapter *adapter,
 930                                         struct ixgb_buffer *buffer_info)
 931 {
 932         struct pci_dev *pdev = adapter->pdev;
 933
 934         if (buffer_info->dma)
 935                 pci_unmap_page(pdev, buffer_info->dma, buffer_info->length,
 936                                PCI_DMA_TODEVICE);
 937
 938         if (buffer_info->skb)
 939                 dev_kfree_skb_any(buffer_info->skb);
 940
 941         buffer_info->skb = NULL;
 942         buffer_info->dma = 0;
 943         buffer_info->time_stamp = 0;
 944         /* these fields must always be initialized in tx
 945          * buffer_info->length = 0;
 946          * buffer_info->next_to_watch = 0; */
 947 }
 948
 949 /**
 950  * ixgb_clean_tx_ring - Free Tx Buffers
 951  * @adapter: board private structure
 952  **/
 953
 954 static void
 955 ixgb_clean_tx_ring(struct ixgb_adapter *adapter)
 956 {
 957         struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
 958         struct ixgb_buffer *buffer_info;
 959         unsigned long size;
 960         unsigned int i;
 961
 962         /* Free all the Tx ring sk_buffs */
 963
 964         for(i = 0; i < tx_ring->count; i++) {
 965                 buffer_info = &tx_ring->buffer_info[i];
 966                 ixgb_unmap_and_free_tx_resource(adapter, buffer_info);
 967         }
 968
 969         size = sizeof(struct ixgb_buffer) * tx_ring->count;
 970         memset(tx_ring->buffer_info, 0, size);
 971
 972         /* Zero out the descriptor ring */
 973
 974         memset(tx_ring->desc, 0, tx_ring->size);
 975
 976         tx_ring->next_to_use = 0;
 977         tx_ring->next_to_clean = 0;
 978
 979         IXGB_WRITE_REG(&adapter->hw, TDH, 0);
 980         IXGB_WRITE_REG(&adapter->hw, TDT, 0);
 981 }
 982
 983 /**
 984  * ixgb_free_rx_resources - Free Rx Resources
 985  * @adapter: board private structure
 986  *
 987  * Free all receive software resources
 988  **/
 989
 990 void
 991 ixgb_free_rx_resources(struct ixgb_adapter *adapter)
 992 {
 993         struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
 994         struct pci_dev *pdev = adapter->pdev;
 995
 996         ixgb_clean_rx_ring(adapter);
 997
 998         vfree(rx_ring->buffer_info);
 999         rx_ring->buffer_info = NULL;
1000
1001         pci_free_consistent(pdev, rx_ring->size, rx_ring->desc, rx_ring->dma);
1002
1003         rx_ring->desc = NULL;
1004 }
1005
1006 /**
1007  * ixgb_clean_rx_ring - Free Rx Buffers
1008  * @adapter: board private structure
1009  **/
1010
1011 static void
1012 ixgb_clean_rx_ring(struct ixgb_adapter *adapter)
1013 {
1014         struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
1015         struct ixgb_buffer *buffer_info;
1016         struct pci_dev *pdev = adapter->pdev;
1017         unsigned long size;
1018         unsigned int i;
1019
1020         /* Free all the Rx ring sk_buffs */
1021
1022         for(i = 0; i < rx_ring->count; i++) {
1023                 buffer_info = &rx_ring->buffer_info[i];
1024                 if(buffer_info->skb) {
1025
1026                         pci_unmap_single(pdev,
1027                                          buffer_info->dma,
1028                                          buffer_info->length,
1029                                          PCI_DMA_FROMDEVICE);
1030
1031                         dev_kfree_skb(buffer_info->skb);
1032
1033                         buffer_info->skb = NULL;
1034                 }
1035         }
1036
1037         size = sizeof(struct ixgb_buffer) * rx_ring->count;
1038         memset(rx_ring->buffer_info, 0, size);
1039
1040         /* Zero out the descriptor ring */
1041
1042         memset(rx_ring->desc, 0, rx_ring->size);
1043
1044         rx_ring->next_to_clean = 0;
1045         rx_ring->next_to_use = 0;
1046
1047         IXGB_WRITE_REG(&adapter->hw, RDH, 0);
1048         IXGB_WRITE_REG(&adapter->hw, RDT, 0);
1049 }
1050
1051 /**
1052  * ixgb_set_mac - Change the Ethernet Address of the NIC
1053  * @netdev: network interface device structure
1054  * @p: pointer to an address structure
1055  *
1056  * Returns 0 on success, negative on failure
1057  **/
1058
1059 static int
1060 ixgb_set_mac(struct net_device *netdev, void *p)
1061 {
1062         struct ixgb_adapter *adapter = netdev_priv(netdev);
1063         struct sockaddr *addr = p;
1064
1065         if(!is_valid_ether_addr(addr->sa_data))
1066                 return -EADDRNOTAVAIL;
1067
1068         memcpy(netdev->dev_addr, addr->sa_data, netdev->addr_len);
1069
1070         ixgb_rar_set(&adapter->hw, addr->sa_data, 0);
1071
1072         return 0;
1073 }
1074
1075 /**
1076  * ixgb_set_multi - Multicast and Promiscuous mode set
1077  * @netdev: network interface device structure
1078  *
1079  * The set_multi entry point is called whenever the multicast address
1080  * list or the network interface flags are updated.  This routine is
1081  * responsible for configuring the hardware for proper multicast,
1082  * promiscuous mode, and all-multi behavior.
1083  **/
1084
1085 static void
1086 ixgb_set_multi(struct net_device *netdev)
1087 {
1088         struct ixgb_adapter *adapter = netdev_priv(netdev);
1089         struct ixgb_hw *hw = &adapter->hw;
1090         struct dev_mc_list *mc_ptr;
1091         uint32_t rctl;
1092         int i;
1093
1094         /* Check for Promiscuous and All Multicast modes */
1095
1096         rctl = IXGB_READ_REG(hw, RCTL);
1097
1098         if(netdev->flags & IFF_PROMISC) {
1099                 rctl |= (IXGB_RCTL_UPE | IXGB_RCTL_MPE);
1100         } else if(netdev->flags & IFF_ALLMULTI) {
1101                 rctl |= IXGB_RCTL_MPE;
1102                 rctl &= ~IXGB_RCTL_UPE;
1103         } else {
1104                 rctl &= ~(IXGB_RCTL_UPE | IXGB_RCTL_MPE);
1105         }
1106
1107         if(netdev->mc_count > IXGB_MAX_NUM_MULTICAST_ADDRESSES) {
1108                 rctl |= IXGB_RCTL_MPE;
1109                 IXGB_WRITE_REG(hw, RCTL, rctl);
1110         } else {
1111                 uint8_t mta[netdev->mc_count * IXGB_ETH_LENGTH_OF_ADDRESS];
1112
1113                 IXGB_WRITE_REG(hw, RCTL, rctl);
1114
1115                 for(i = 0, mc_ptr = netdev->mc_list; mc_ptr;
1116                         i++, mc_ptr = mc_ptr->next)
1117                         memcpy(&mta[i * IXGB_ETH_LENGTH_OF_ADDRESS],
1118                                    mc_ptr->dmi_addr, IXGB_ETH_LENGTH_OF_ADDRESS);
1119
1120                 ixgb_mc_addr_list_update(hw, mta, netdev->mc_count, 0);
1121         }
1122 }
1123
1124 /**
1125  * ixgb_watchdog - Timer Call-back
1126  * @data: pointer to netdev cast into an unsigned long
1127  **/
1128
1129 static void
1130 ixgb_watchdog(unsigned long data)
1131 {
1132         struct ixgb_adapter *adapter = (struct ixgb_adapter *)data;
1133         struct net_device *netdev = adapter->netdev;
1134         struct ixgb_desc_ring *txdr = &adapter->tx_ring;
1135
1136         ixgb_check_for_link(&adapter->hw);
1137
1138         if (ixgb_check_for_bad_link(&adapter->hw)) {
1139                 /* force the reset path */
1140                 netif_stop_queue(netdev);
1141         }
1142
1143         if(adapter->hw.link_up) {
1144                 if(!netif_carrier_ok(netdev)) {
1145                         DPRINTK(LINK, INFO,
1146                                 "NIC Link is Up 10000 Mbps Full Duplex\n");
1147                         adapter->link_speed = 10000;
1148                         adapter->link_duplex = FULL_DUPLEX;
1149                         netif_carrier_on(netdev);
1150                         netif_wake_queue(netdev);
1151                 }
1152         } else {
1153                 if(netif_carrier_ok(netdev)) {
1154                         adapter->link_speed = 0;
1155                         adapter->link_duplex = 0;
1156                         DPRINTK(LINK, INFO, "NIC Link is Down\n");
1157                         netif_carrier_off(netdev);
1158                         netif_stop_queue(netdev);
1159
1160                 }
1161         }
1162
1163         ixgb_update_stats(adapter);
1164
1165         if(!netif_carrier_ok(netdev)) {
1166                 if(IXGB_DESC_UNUSED(txdr) + 1 < txdr->count) {
1167                         /* We've lost link, so the controller stops DMA,
1168                          * but we've got queued Tx work that's never going
1169                          * to get done, so reset controller to flush Tx.
1170                          * (Do the reset outside of interrupt context). */
1171                         schedule_work(&adapter->tx_timeout_task);
1172                 }
1173         }
1174
1175         /* Force detection of hung controller every watchdog period */
1176         adapter->detect_tx_hung = TRUE;
1177
1178         /* generate an interrupt to force clean up of any stragglers */
1179         IXGB_WRITE_REG(&adapter->hw, ICS, IXGB_INT_TXDW);
1180
1181         /* Reset the timer */
1182         mod_timer(&adapter->watchdog_timer, jiffies + 2 * HZ);
1183 }
1184
1185 #define IXGB_TX_FLAGS_CSUM              0x00000001
1186 #define IXGB_TX_FLAGS_VLAN              0x00000002
1187 #define IXGB_TX_FLAGS_TSO               0x00000004
1188
1189 static inline int
1190 ixgb_tso(struct ixgb_adapter *adapter, struct sk_buff *skb)
1191 {
1192 #ifdef NETIF_F_TSO
1193         struct ixgb_context_desc *context_desc;
1194         unsigned int i;
1195         uint8_t ipcss, ipcso, tucss, tucso, hdr_len;
1196         uint16_t ipcse, tucse, mss;
1197         int err;
1198
1199         if(likely(skb_shinfo(skb)->tso_size)) {
1200                 if (skb_header_cloned(skb)) {
1201                         err = pskb_expand_head(skb, 0, 0, GFP_ATOMIC);
1202                         if (err)
1203                                 return err;
1204                 }
1205
1206                 hdr_len = ((skb->h.raw - skb->data) + (skb->h.th->doff << 2));
1207                 mss = skb_shinfo(skb)->tso_size;
1208                 skb->nh.iph->tot_len = 0;
1209                 skb->nh.iph->check = 0;
1210                 skb->h.th->check = ~csum_tcpudp_magic(skb->nh.iph->saddr,
1211                                                       skb->nh.iph->daddr,
1212                                                       0, IPPROTO_TCP, 0);
1213                 ipcss = skb->nh.raw - skb->data;
1214                 ipcso = (void *)&(skb->nh.iph->check) - (void *)skb->data;
1215                 ipcse = skb->h.raw - skb->data - 1;
1216                 tucss = skb->h.raw - skb->data;
1217                 tucso = (void *)&(skb->h.th->check) - (void *)skb->data;
1218                 tucse = 0;
1219
1220                 i = adapter->tx_ring.next_to_use;
1221                 context_desc = IXGB_CONTEXT_DESC(adapter->tx_ring, i);
1222
1223                 context_desc->ipcss = ipcss;
1224                 context_desc->ipcso = ipcso;
1225                 context_desc->ipcse = cpu_to_le16(ipcse);
1226                 context_desc->tucss = tucss;
1227                 context_desc->tucso = tucso;
1228                 context_desc->tucse = cpu_to_le16(tucse);
1229                 context_desc->mss = cpu_to_le16(mss);
1230                 context_desc->hdr_len = hdr_len;
1231                 context_desc->status = 0;
1232                 context_desc->cmd_type_len = cpu_to_le32(
1233                                                   IXGB_CONTEXT_DESC_TYPE
1234                                                 | IXGB_CONTEXT_DESC_CMD_TSE
1235                                                 | IXGB_CONTEXT_DESC_CMD_IP
1236                                                 | IXGB_CONTEXT_DESC_CMD_TCP
1237                                                 | IXGB_CONTEXT_DESC_CMD_IDE
1238                                                 | (skb->len - (hdr_len)));
1239
1240
1241                 if(++i == adapter->tx_ring.count) i = 0;
1242                 adapter->tx_ring.next_to_use = i;
1243
1244                 return 1;
1245         }
1246 #endif
1247
1248         return 0;
1249 }
1250
1251 static inline boolean_t
1252 ixgb_tx_csum(struct ixgb_adapter *adapter, struct sk_buff *skb)
1253 {
1254         struct ixgb_context_desc *context_desc;
1255         unsigned int i;
1256         uint8_t css, cso;
1257
1258         if(likely(skb->ip_summed == CHECKSUM_HW)) {
1259                 css = skb->h.raw - skb->data;
1260                 cso = (skb->h.raw + skb->csum) - skb->data;
1261
1262                 i = adapter->tx_ring.next_to_use;
1263                 context_desc = IXGB_CONTEXT_DESC(adapter->tx_ring, i);
1264
1265                 context_desc->tucss = css;
1266                 context_desc->tucso = cso;
1267                 context_desc->tucse = 0;
1268                 /* zero out any previously existing data in one instruction */
1269                 *(uint32_t *)&(context_desc->ipcss) = 0;
1270                 context_desc->status = 0;
1271                 context_desc->hdr_len = 0;
1272                 context_desc->mss = 0;
1273                 context_desc->cmd_type_len =
1274                         cpu_to_le32(IXGB_CONTEXT_DESC_TYPE
1275                                     | IXGB_TX_DESC_CMD_IDE);
1276
1277                 if(++i == adapter->tx_ring.count) i = 0;
1278                 adapter->tx_ring.next_to_use = i;
1279
1280                 return TRUE;
1281         }
1282
1283         return FALSE;
1284 }
1285
1286 #define IXGB_MAX_TXD_PWR        14
1287 #define IXGB_MAX_DATA_PER_TXD   (1<<IXGB_MAX_TXD_PWR)
1288
1289 static inline int
1290 ixgb_tx_map(struct ixgb_adapter *adapter, struct sk_buff *skb,
1291             unsigned int first)
1292 {
1293         struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
1294         struct ixgb_buffer *buffer_info;
1295         int len = skb->len;
1296         unsigned int offset = 0, size, count = 0, i;
1297         unsigned int mss = skb_shinfo(skb)->tso_size;
1298
1299         unsigned int nr_frags = skb_shinfo(skb)->nr_frags;
1300         unsigned int f;
1301
1302         len -= skb->data_len;
1303
1304         i = tx_ring->next_to_use;
1305
1306         while(len) {
1307                 buffer_info = &tx_ring->buffer_info[i];
1308                 size = min(len, IXGB_MAX_JUMBO_FRAME_SIZE);
1309                 /* Workaround for premature desc write-backs
1310                  * in TSO mode.  Append 4-byte sentinel desc */
1311                 if(unlikely(mss && !nr_frags && size == len && size > 8))
1312                         size -= 4;
1313
1314                 buffer_info->length = size;
1315                 buffer_info->dma =
1316                         pci_map_single(adapter->pdev,
1317                                 skb->data + offset,
1318                                 size,
1319                                 PCI_DMA_TODEVICE);
1320                 buffer_info->time_stamp = jiffies;
1321                 buffer_info->next_to_watch = 0;
1322
1323                 len -= size;
1324                 offset += size;
1325                 count++;
1326                 if(++i == tx_ring->count) i = 0;
1327         }
1328
1329         for(f = 0; f < nr_frags; f++) {
1330                 struct skb_frag_struct *frag;
1331
1332                 frag = &skb_shinfo(skb)->frags[f];
1333                 len = frag->size;
1334                 offset = 0;
1335
1336                 while(len) {
1337                         buffer_info = &tx_ring->buffer_info[i];
1338                         size = min(len, IXGB_MAX_JUMBO_FRAME_SIZE);
1339                         /* Workaround for premature desc write-backs
1340                          * in TSO mode.  Append 4-byte sentinel desc */
1341                         if(unlikely(mss && (f == (nr_frags-1)) && (size == len)
1342                                     && (size > 8)))
1343                                 size -= 4;
1344
1345                         buffer_info->length = size;
1346                         buffer_info->dma =
1347                                 pci_map_page(adapter->pdev,
1348                                         frag->page,
1349                                         frag->page_offset + offset,
1350                                         size,
1351                                         PCI_DMA_TODEVICE);
1352                         buffer_info->time_stamp = jiffies;
1353                         buffer_info->next_to_watch = 0;
1354
1355                         len -= size;
1356                         offset += size;
1357                         count++;
1358                         if(++i == tx_ring->count) i = 0;
1359                 }
1360         }
1361         i = (i == 0) ? tx_ring->count - 1 : i - 1;
1362         tx_ring->buffer_info[i].skb = skb;
1363         tx_ring->buffer_info[first].next_to_watch = i;
1364
1365         return count;
1366 }
1367
1368 static inline void
1369 ixgb_tx_queue(struct ixgb_adapter *adapter, int count, int vlan_id,int tx_flags)
1370 {
1371         struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
1372         struct ixgb_tx_desc *tx_desc = NULL;
1373         struct ixgb_buffer *buffer_info;
1374         uint32_t cmd_type_len = adapter->tx_cmd_type;
1375         uint8_t status = 0;
1376         uint8_t popts = 0;
1377         unsigned int i;
1378
1379         if(tx_flags & IXGB_TX_FLAGS_TSO) {
1380                 cmd_type_len |= IXGB_TX_DESC_CMD_TSE;
1381                 popts |= (IXGB_TX_DESC_POPTS_IXSM | IXGB_TX_DESC_POPTS_TXSM);
1382         }
1383
1384         if(tx_flags & IXGB_TX_FLAGS_CSUM)
1385                 popts |= IXGB_TX_DESC_POPTS_TXSM;
1386
1387         if(tx_flags & IXGB_TX_FLAGS_VLAN) {
1388                 cmd_type_len |= IXGB_TX_DESC_CMD_VLE;
1389         }
1390
1391         i = tx_ring->next_to_use;
1392
1393         while(count--) {
1394                 buffer_info = &tx_ring->buffer_info[i];
1395                 tx_desc = IXGB_TX_DESC(*tx_ring, i);
1396                 tx_desc->buff_addr = cpu_to_le64(buffer_info->dma);
1397                 tx_desc->cmd_type_len =
1398                         cpu_to_le32(cmd_type_len | buffer_info->length);
1399                 tx_desc->status = status;
1400                 tx_desc->popts = popts;
1401                 tx_desc->vlan = cpu_to_le16(vlan_id);
1402
1403                 if(++i == tx_ring->count) i = 0;
1404         }
1405
1406         tx_desc->cmd_type_len |= cpu_to_le32(IXGB_TX_DESC_CMD_EOP
1407                                 | IXGB_TX_DESC_CMD_RS );
1408
1409         /* Force memory writes to complete before letting h/w
1410          * know there are new descriptors to fetch.  (Only
1411          * applicable for weak-ordered memory model archs,
1412          * such as IA-64). */
1413         wmb();
1414
1415         tx_ring->next_to_use = i;
1416         IXGB_WRITE_REG(&adapter->hw, TDT, i);
1417 }
1418
1419 /* Tx Descriptors needed, worst case */
1420 #define TXD_USE_COUNT(S) (((S) >> IXGB_MAX_TXD_PWR) + \
1421                          (((S) & (IXGB_MAX_DATA_PER_TXD - 1)) ? 1 : 0))
1422 #define DESC_NEEDED TXD_USE_COUNT(IXGB_MAX_DATA_PER_TXD) + \
1423         MAX_SKB_FRAGS * TXD_USE_COUNT(PAGE_SIZE) + 1 \
1424         /* one more for TSO workaround */ + 1
1425
1426 static int
1427 ixgb_xmit_frame(struct sk_buff *skb, struct net_device *netdev)
1428 {
1429         struct ixgb_adapter *adapter = netdev_priv(netdev);
1430         unsigned int first;
1431         unsigned int tx_flags = 0;
1432         unsigned long flags;
1433         int vlan_id = 0;
1434         int tso;
1435
1436         if(skb->len <= 0) {
1437                 dev_kfree_skb_any(skb);
1438                 return 0;
1439         }
1440
1441 #ifdef NETIF_F_LLTX
1442         local_irq_save(flags);
1443         if (!spin_trylock(&adapter->tx_lock)) {
1444                 /* Collision - tell upper layer to requeue */
1445                 local_irq_restore(flags);
1446                 return NETDEV_TX_LOCKED;
1447         }
1448 #else
1449         spin_lock_irqsave(&adapter->tx_lock, flags);
1450 #endif
1451
1452         if(unlikely(IXGB_DESC_UNUSED(&adapter->tx_ring) < DESC_NEEDED)) {
1453                 netif_stop_queue(netdev);
1454                 spin_unlock_irqrestore(&adapter->tx_lock, flags);
1455                 return NETDEV_TX_BUSY;
1456         }
1457
1458 #ifndef NETIF_F_LLTX
1459         spin_unlock_irqrestore(&adapter->tx_lock, flags);
1460 #endif
1461
1462         if(adapter->vlgrp && vlan_tx_tag_present(skb)) {
1463                 tx_flags |= IXGB_TX_FLAGS_VLAN;
1464                 vlan_id = vlan_tx_tag_get(skb);
1465         }
1466
1467         first = adapter->tx_ring.next_to_use;
1468
1469         tso = ixgb_tso(adapter, skb);
1470         if (tso < 0) {
1471                 dev_kfree_skb_any(skb);
1472 #ifdef NETIF_F_LLTX
1473                 spin_unlock_irqrestore(&adapter->tx_lock, flags);
1474 #endif
1475                 return NETDEV_TX_OK;
1476         }
1477
1478         if (likely(tso))
1479                 tx_flags |= IXGB_TX_FLAGS_TSO;
1480         else if(ixgb_tx_csum(adapter, skb))
1481                 tx_flags |= IXGB_TX_FLAGS_CSUM;
1482
1483         ixgb_tx_queue(adapter, ixgb_tx_map(adapter, skb, first), vlan_id,
1484                         tx_flags);
1485
1486         netdev->trans_start = jiffies;
1487
1488 #ifdef NETIF_F_LLTX
1489         /* Make sure there is space in the ring for the next send. */
1490         if(unlikely(IXGB_DESC_UNUSED(&adapter->tx_ring) < DESC_NEEDED))
1491                 netif_stop_queue(netdev);
1492
1493         spin_unlock_irqrestore(&adapter->tx_lock, flags);
1494
1495 #endif
1496         return NETDEV_TX_OK;
1497 }
1498
1499 /**
1500  * ixgb_tx_timeout - Respond to a Tx Hang
1501  * @netdev: network interface device structure
1502  **/
1503
1504 static void
1505 ixgb_tx_timeout(struct net_device *netdev)
1506 {
1507         struct ixgb_adapter *adapter = netdev_priv(netdev);
1508
1509         /* Do the reset outside of interrupt context */
1510         schedule_work(&adapter->tx_timeout_task);
1511 }
1512
1513 static void
1514 ixgb_tx_timeout_task(struct net_device *netdev)
1515 {
1516         struct ixgb_adapter *adapter = netdev_priv(netdev);
1517
1518         adapter->tx_timeout_count++;
1519         ixgb_down(adapter, TRUE);
1520         ixgb_up(adapter);
1521 }
1522
1523 /**
1524  * ixgb_get_stats - Get System Network Statistics
1525  * @netdev: network interface device structure
1526  *
1527  * Returns the address of the device statistics structure.
1528  * The statistics are actually updated from the timer callback.
1529  **/
1530
1531 static struct net_device_stats *
1532 ixgb_get_stats(struct net_device *netdev)
1533 {
1534         struct ixgb_adapter *adapter = netdev_priv(netdev);
1535
1536         return &adapter->net_stats;
1537 }
1538
1539 /**
1540  * ixgb_change_mtu - Change the Maximum Transfer Unit
1541  * @netdev: network interface device structure
1542  * @new_mtu: new value for maximum frame size
1543  *
1544  * Returns 0 on success, negative on failure
1545  **/
1546
1547 static int
1548 ixgb_change_mtu(struct net_device *netdev, int new_mtu)
1549 {
1550         struct ixgb_adapter *adapter = netdev_priv(netdev);
1551         int max_frame = new_mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;
1552         int old_max_frame = netdev->mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;
1553
1554
1555         if((max_frame < IXGB_MIN_ENET_FRAME_SIZE_WITHOUT_FCS + ENET_FCS_LENGTH)
1556            || (max_frame > IXGB_MAX_JUMBO_FRAME_SIZE + ENET_FCS_LENGTH)) {
1557                 DPRINTK(PROBE, ERR, "Invalid MTU setting %d\n", new_mtu);
1558                 return -EINVAL;
1559         }
1560
1561         if((max_frame <= IXGB_MAX_ENET_FRAME_SIZE_WITHOUT_FCS + ENET_FCS_LENGTH)
1562            || (max_frame <= IXGB_RXBUFFER_2048)) {
1563                 adapter->rx_buffer_len = IXGB_RXBUFFER_2048;
1564
1565         } else if(max_frame <= IXGB_RXBUFFER_4096) {
1566                 adapter->rx_buffer_len = IXGB_RXBUFFER_4096;
1567
1568         } else if(max_frame <= IXGB_RXBUFFER_8192) {
1569                 adapter->rx_buffer_len = IXGB_RXBUFFER_8192;
1570
1571         } else {
1572                 adapter->rx_buffer_len = IXGB_RXBUFFER_16384;
1573         }
1574
1575         netdev->mtu = new_mtu;
1576
1577         if(old_max_frame != max_frame && netif_running(netdev)) {
1578
1579                 ixgb_down(adapter, TRUE);
1580                 ixgb_up(adapter);
1581         }
1582
1583         return 0;
1584 }
1585
1586 /**
1587  * ixgb_update_stats - Update the board statistics counters.
1588  * @adapter: board private structure
1589  **/
1590
1591 void
1592 ixgb_update_stats(struct ixgb_adapter *adapter)
1593 {
1594         struct net_device *netdev = adapter->netdev;
1595
1596         if((netdev->flags & IFF_PROMISC) || (netdev->flags & IFF_ALLMULTI) ||
1597            (netdev->mc_count > IXGB_MAX_NUM_MULTICAST_ADDRESSES)) {
1598                 u64 multi = IXGB_READ_REG(&adapter->hw, MPRCL);
1599                 u32 bcast_l = IXGB_READ_REG(&adapter->hw, BPRCL);
1600                 u32 bcast_h = IXGB_READ_REG(&adapter->hw, BPRCH);
1601                 u64 bcast = ((u64)bcast_h << 32) | bcast_l;
1602
1603                 multi |= ((u64)IXGB_READ_REG(&adapter->hw, MPRCH) << 32);
1604                 /* fix up multicast stats by removing broadcasts */
1605                 if(multi >= bcast)
1606                         multi -= bcast;
1607
1608                 adapter->stats.mprcl += (multi & 0xFFFFFFFF);
1609                 adapter->stats.mprch += (multi >> 32);
1610                 adapter->stats.bprcl += bcast_l;
1611                 adapter->stats.bprch += bcast_h;
1612         } else {
1613                 adapter->stats.mprcl += IXGB_READ_REG(&adapter->hw, MPRCL);
1614                 adapter->stats.mprch += IXGB_READ_REG(&adapter->hw, MPRCH);
1615                 adapter->stats.bprcl += IXGB_READ_REG(&adapter->hw, BPRCL);
1616                 adapter->stats.bprch += IXGB_READ_REG(&adapter->hw, BPRCH);
1617         }
1618         adapter->stats.tprl += IXGB_READ_REG(&adapter->hw, TPRL);
1619         adapter->stats.tprh += IXGB_READ_REG(&adapter->hw, TPRH);
1620         adapter->stats.gprcl += IXGB_READ_REG(&adapter->hw, GPRCL);
1621         adapter->stats.gprch += IXGB_READ_REG(&adapter->hw, GPRCH);
1622         adapter->stats.uprcl += IXGB_READ_REG(&adapter->hw, UPRCL);
1623         adapter->stats.uprch += IXGB_READ_REG(&adapter->hw, UPRCH);
1624         adapter->stats.vprcl += IXGB_READ_REG(&adapter->hw, VPRCL);
1625         adapter->stats.vprch += IXGB_READ_REG(&adapter->hw, VPRCH);
1626         adapter->stats.jprcl += IXGB_READ_REG(&adapter->hw, JPRCL);
1627         adapter->stats.jprch += IXGB_READ_REG(&adapter->hw, JPRCH);
1628         adapter->stats.gorcl += IXGB_READ_REG(&adapter->hw, GORCL);
1629         adapter->stats.gorch += IXGB_READ_REG(&adapter->hw, GORCH);
1630         adapter->stats.torl += IXGB_READ_REG(&adapter->hw, TORL);
1631         adapter->stats.torh += IXGB_READ_REG(&adapter->hw, TORH);
1632         adapter->stats.rnbc += IXGB_READ_REG(&adapter->hw, RNBC);
1633         adapter->stats.ruc += IXGB_READ_REG(&adapter->hw, RUC);
1634         adapter->stats.roc += IXGB_READ_REG(&adapter->hw, ROC);
1635         adapter->stats.rlec += IXGB_READ_REG(&adapter->hw, RLEC);
1636         adapter->stats.crcerrs += IXGB_READ_REG(&adapter->hw, CRCERRS);
1637         adapter->stats.icbc += IXGB_READ_REG(&adapter->hw, ICBC);
1638         adapter->stats.ecbc += IXGB_READ_REG(&adapter->hw, ECBC);
1639         adapter->stats.mpc += IXGB_READ_REG(&adapter->hw, MPC);
1640         adapter->stats.tptl += IXGB_READ_REG(&adapter->hw, TPTL);
1641         adapter->stats.tpth += IXGB_READ_REG(&adapter->hw, TPTH);
1642         adapter->stats.gptcl += IXGB_READ_REG(&adapter->hw, GPTCL);
1643         adapter->stats.gptch += IXGB_READ_REG(&adapter->hw, GPTCH);
1644         adapter->stats.bptcl += IXGB_READ_REG(&adapter->hw, BPTCL);
1645         adapter->stats.bptch += IXGB_READ_REG(&adapter->hw, BPTCH);
1646         adapter->stats.mptcl += IXGB_READ_REG(&adapter->hw, MPTCL);
1647         adapter->stats.mptch += IXGB_READ_REG(&adapter->hw, MPTCH);
1648         adapter->stats.uptcl += IXGB_READ_REG(&adapter->hw, UPTCL);
1649         adapter->stats.uptch += IXGB_READ_REG(&adapter->hw, UPTCH);
1650         adapter->stats.vptcl += IXGB_READ_REG(&adapter->hw, VPTCL);
1651         adapter->stats.vptch += IXGB_READ_REG(&adapter->hw, VPTCH);
1652         adapter->stats.jptcl += IXGB_READ_REG(&adapter->hw, JPTCL);
1653         adapter->stats.jptch += IXGB_READ_REG(&adapter->hw, JPTCH);
1654         adapter->stats.gotcl += IXGB_READ_REG(&adapter->hw, GOTCL);
1655         adapter->stats.gotch += IXGB_READ_REG(&adapter->hw, GOTCH);
1656         adapter->stats.totl += IXGB_READ_REG(&adapter->hw, TOTL);
1657         adapter->stats.toth += IXGB_READ_REG(&adapter->hw, TOTH);
1658         adapter->stats.dc += IXGB_READ_REG(&adapter->hw, DC);
1659         adapter->stats.plt64c += IXGB_READ_REG(&adapter->hw, PLT64C);
1660         adapter->stats.tsctc += IXGB_READ_REG(&adapter->hw, TSCTC);
1661         adapter->stats.tsctfc += IXGB_READ_REG(&adapter->hw, TSCTFC);
1662         adapter->stats.ibic += IXGB_READ_REG(&adapter->hw, IBIC);
1663         adapter->stats.rfc += IXGB_READ_REG(&adapter->hw, RFC);
1664         adapter->stats.lfc += IXGB_READ_REG(&adapter->hw, LFC);
1665         adapter->stats.pfrc += IXGB_READ_REG(&adapter->hw, PFRC);
1666         adapter->stats.pftc += IXGB_READ_REG(&adapter->hw, PFTC);
1667         adapter->stats.mcfrc += IXGB_READ_REG(&adapter->hw, MCFRC);
1668         adapter->stats.mcftc += IXGB_READ_REG(&adapter->hw, MCFTC);
1669         adapter->stats.xonrxc += IXGB_READ_REG(&adapter->hw, XONRXC);
1670         adapter->stats.xontxc += IXGB_READ_REG(&adapter->hw, XONTXC);
1671         adapter->stats.xoffrxc += IXGB_READ_REG(&adapter->hw, XOFFRXC);
1672         adapter->stats.xofftxc += IXGB_READ_REG(&adapter->hw, XOFFTXC);
1673         adapter->stats.rjc += IXGB_READ_REG(&adapter->hw, RJC);
1674
1675         /* Fill out the OS statistics structure */
1676
1677         adapter->net_stats.rx_packets = adapter->stats.gprcl;
1678         adapter->net_stats.tx_packets = adapter->stats.gptcl;
1679         adapter->net_stats.rx_bytes = adapter->stats.gorcl;
1680         adapter->net_stats.tx_bytes = adapter->stats.gotcl;
1681         adapter->net_stats.multicast = adapter->stats.mprcl;
1682         adapter->net_stats.collisions = 0;
1683
1684         /* ignore RLEC as it reports errors for padded (<64bytes) frames
1685          * with a length in the type/len field */
1686         adapter->net_stats.rx_errors =
1687             /* adapter->stats.rnbc + */ adapter->stats.crcerrs +
1688             adapter->stats.ruc +
1689             adapter->stats.roc /*+ adapter->stats.rlec */  +
1690             adapter->stats.icbc +
1691             adapter->stats.ecbc + adapter->stats.mpc;
1692
1693         /* see above
1694          * adapter->net_stats.rx_length_errors = adapter->stats.rlec;
1695          */
1696
1697         adapter->net_stats.rx_crc_errors = adapter->stats.crcerrs;
1698         adapter->net_stats.rx_fifo_errors = adapter->stats.mpc;
1699         adapter->net_stats.rx_missed_errors = adapter->stats.mpc;
1700         adapter->net_stats.rx_over_errors = adapter->stats.mpc;
1701
1702         adapter->net_stats.tx_errors = 0;
1703         adapter->net_stats.rx_frame_errors = 0;
1704         adapter->net_stats.tx_aborted_errors = 0;
1705         adapter->net_stats.tx_carrier_errors = 0;
1706         adapter->net_stats.tx_fifo_errors = 0;
1707         adapter->net_stats.tx_heartbeat_errors = 0;
1708         adapter->net_stats.tx_window_errors = 0;
1709 }
1710
1711 #define IXGB_MAX_INTR 10
1712 /**
1713  * ixgb_intr - Interrupt Handler
1714  * @irq: interrupt number
1715  * @data: pointer to a network interface device structure
1716  * @pt_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 = data;
1723         struct ixgb_adapter *adapter = netdev_priv(netdev);
1724         struct ixgb_hw *hw = &adapter->hw;
1725         uint32_t icr = IXGB_READ_REG(hw, ICR);
1726 #ifndef CONFIG_IXGB_NAPI
1727         unsigned int i;
1728 #endif
1729
1730         if(unlikely(!icr))
1731                 return IRQ_NONE;  /* Not our interrupt */
1732
1733         if(unlikely(icr & (IXGB_INT_RXSEQ | IXGB_INT_LSC))) {
1734                 mod_timer(&adapter->watchdog_timer, jiffies);
1735         }
1736
1737 #ifdef CONFIG_IXGB_NAPI
1738         if(netif_rx_schedule_prep(netdev)) {
1739
1740                 /* Disable interrupts and register for poll. The flush
1741                   of the posted write is intentionally left out.
1742                 */
1743
1744                 atomic_inc(&adapter->irq_sem);
1745                 IXGB_WRITE_REG(&adapter->hw, IMC, ~0);
1746                 __netif_rx_schedule(netdev);
1747         }
1748 #else
1749         /* yes, that is actually a & and it is meant to make sure that
1750          * every pass through this for loop checks both receive and
1751          * transmit queues for completed descriptors, intended to
1752          * avoid starvation issues and assist tx/rx fairness. */
1753         for(i = 0; i < IXGB_MAX_INTR; i++)
1754                 if(!ixgb_clean_rx_irq(adapter) &
1755                    !ixgb_clean_tx_irq(adapter))
1756                         break;
1757 #endif
1758         return IRQ_HANDLED;
1759 }
1760
1761 #ifdef CONFIG_IXGB_NAPI
1762 /**
1763  * ixgb_clean - NAPI Rx polling callback
1764  * @adapter: board private structure
1765  **/
1766
1767 static int
1768 ixgb_clean(struct net_device *netdev, int *budget)
1769 {
1770         struct ixgb_adapter *adapter = netdev_priv(netdev);
1771         int work_to_do = min(*budget, netdev->quota);
1772         int tx_cleaned;
1773         int work_done = 0;
1774
1775         tx_cleaned = ixgb_clean_tx_irq(adapter);
1776         ixgb_clean_rx_irq(adapter, &work_done, work_to_do);
1777
1778         *budget -= work_done;
1779         netdev->quota -= work_done;
1780
1781         /* if no Tx and not enough Rx work done, exit the polling mode */
1782         if((!tx_cleaned && (work_done == 0)) || !netif_running(netdev)) {
1783                 netif_rx_complete(netdev);
1784                 ixgb_irq_enable(adapter);
1785                 return 0;
1786         }
1787
1788         return 1;
1789 }
1790 #endif
1791
1792 /**
1793  * ixgb_clean_tx_irq - Reclaim resources after transmit completes
1794  * @adapter: board private structure
1795  **/
1796
1797 static boolean_t
1798 ixgb_clean_tx_irq(struct ixgb_adapter *adapter)
1799 {
1800         struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
1801         struct net_device *netdev = adapter->netdev;
1802         struct ixgb_tx_desc *tx_desc, *eop_desc;
1803         struct ixgb_buffer *buffer_info;
1804         unsigned int i, eop;
1805         boolean_t cleaned = FALSE;
1806
1807         i = tx_ring->next_to_clean;
1808         eop = tx_ring->buffer_info[i].next_to_watch;
1809         eop_desc = IXGB_TX_DESC(*tx_ring, eop);
1810
1811         while(eop_desc->status & IXGB_TX_DESC_STATUS_DD) {
1812
1813                 for(cleaned = FALSE; !cleaned; ) {
1814                         tx_desc = IXGB_TX_DESC(*tx_ring, i);
1815                         buffer_info = &tx_ring->buffer_info[i];
1816
1817                         if (tx_desc->popts
1818                             & (IXGB_TX_DESC_POPTS_TXSM |
1819                                IXGB_TX_DESC_POPTS_IXSM))
1820                                 adapter->hw_csum_tx_good++;
1821
1822                         ixgb_unmap_and_free_tx_resource(adapter, buffer_info);
1823
1824                         *(uint32_t *)&(tx_desc->status) = 0;
1825
1826                         cleaned = (i == eop);
1827                         if(++i == tx_ring->count) i = 0;
1828                 }
1829
1830                 eop = tx_ring->buffer_info[i].next_to_watch;
1831                 eop_desc = IXGB_TX_DESC(*tx_ring, eop);
1832         }
1833
1834         tx_ring->next_to_clean = i;
1835
1836         spin_lock(&adapter->tx_lock);
1837         if(cleaned && netif_queue_stopped(netdev) && netif_carrier_ok(netdev) &&
1838            (IXGB_DESC_UNUSED(tx_ring) > IXGB_TX_QUEUE_WAKE)) {
1839
1840                 netif_wake_queue(netdev);
1841         }
1842         spin_unlock(&adapter->tx_lock);
1843
1844         if(adapter->detect_tx_hung) {
1845                 /* detect a transmit hang in hardware, this serializes the
1846                  * check with the clearing of time_stamp and movement of i */
1847                 adapter->detect_tx_hung = FALSE;
1848                 if (tx_ring->buffer_info[eop].dma &&
1849                    time_after(jiffies, tx_ring->buffer_info[eop].time_stamp + HZ)
1850                    && !(IXGB_READ_REG(&adapter->hw, STATUS) &
1851                         IXGB_STATUS_TXOFF)) {
1852                         /* detected Tx unit hang */
1853                         DPRINTK(DRV, ERR, "Detected Tx Unit Hang\n"
1854                                         "  TDH                  <%x>\n"
1855                                         "  TDT                  <%x>\n"
1856                                         "  next_to_use          <%x>\n"
1857                                         "  next_to_clean        <%x>\n"
1858                                         "buffer_info[next_to_clean]\n"
1859                                         "  time_stamp           <%lx>\n"
1860                                         "  next_to_watch        <%x>\n"
1861                                         "  jiffies              <%lx>\n"
1862                                         "  next_to_watch.status <%x>\n",
1863                                 IXGB_READ_REG(&adapter->hw, TDH),
1864                                 IXGB_READ_REG(&adapter->hw, TDT),
1865                                 tx_ring->next_to_use,
1866                                 tx_ring->next_to_clean,
1867                                 tx_ring->buffer_info[eop].time_stamp,
1868                                 eop,
1869                                 jiffies,
1870                                 eop_desc->status);
1871                         netif_stop_queue(netdev);
1872                 }
1873         }
1874
1875         return cleaned;
1876 }
1877
1878 /**
1879  * ixgb_rx_checksum - Receive Checksum Offload for 82597.
1880  * @adapter: board private structure
1881  * @rx_desc: receive descriptor
1882  * @sk_buff: socket buffer with received data
1883  **/
1884
1885 static inline void
1886 ixgb_rx_checksum(struct ixgb_adapter *adapter,
1887                  struct ixgb_rx_desc *rx_desc,
1888                  struct sk_buff *skb)
1889 {
1890         /* Ignore Checksum bit is set OR
1891          * TCP Checksum has not been calculated
1892          */
1893         if((rx_desc->status & IXGB_RX_DESC_STATUS_IXSM) ||
1894            (!(rx_desc->status & IXGB_RX_DESC_STATUS_TCPCS))) {
1895                 skb->ip_summed = CHECKSUM_NONE;
1896                 return;
1897         }
1898
1899         /* At this point we know the hardware did the TCP checksum */
1900         /* now look at the TCP checksum error bit */
1901         if(rx_desc->errors & IXGB_RX_DESC_ERRORS_TCPE) {
1902                 /* let the stack verify checksum errors */
1903                 skb->ip_summed = CHECKSUM_NONE;
1904                 adapter->hw_csum_rx_error++;
1905         } else {
1906                 /* TCP checksum is good */
1907                 skb->ip_summed = CHECKSUM_UNNECESSARY;
1908                 adapter->hw_csum_rx_good++;
1909         }
1910 }
1911
1912 /**
1913  * ixgb_clean_rx_irq - Send received data up the network stack,
1914  * @adapter: board private structure
1915  **/
1916
1917 static boolean_t
1918 #ifdef CONFIG_IXGB_NAPI
1919 ixgb_clean_rx_irq(struct ixgb_adapter *adapter, int *work_done, int work_to_do)
1920 #else
1921 ixgb_clean_rx_irq(struct ixgb_adapter *adapter)
1922 #endif
1923 {
1924         struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
1925         struct net_device *netdev = adapter->netdev;
1926         struct pci_dev *pdev = adapter->pdev;
1927         struct ixgb_rx_desc *rx_desc, *next_rxd;
1928         struct ixgb_buffer *buffer_info, *next_buffer, *next2_buffer;
1929         uint32_t length;
1930         unsigned int i, j;
1931         boolean_t cleaned = FALSE;
1932
1933         i = rx_ring->next_to_clean;
1934         rx_desc = IXGB_RX_DESC(*rx_ring, i);
1935         buffer_info = &rx_ring->buffer_info[i];
1936
1937         while(rx_desc->status & IXGB_RX_DESC_STATUS_DD) {
1938                 struct sk_buff *skb, *next_skb;
1939                 u8 status;
1940
1941 #ifdef CONFIG_IXGB_NAPI
1942                 if(*work_done >= work_to_do)
1943                         break;
1944
1945                 (*work_done)++;
1946 #endif
1947                 status = rx_desc->status;
1948                 skb = buffer_info->skb;
1949                 buffer_info->skb = NULL;
1950
1951                 prefetch(skb->data);
1952
1953                 if(++i == rx_ring->count) i = 0;
1954                 next_rxd = IXGB_RX_DESC(*rx_ring, i);
1955                 prefetch(next_rxd);
1956
1957                 if((j = i + 1) == rx_ring->count) j = 0;
1958                 next2_buffer = &rx_ring->buffer_info[j];
1959                 prefetch(next2_buffer);
1960
1961                 next_buffer = &rx_ring->buffer_info[i];
1962                 next_skb = next_buffer->skb;
1963                 prefetch(next_skb);
1964
1965                 cleaned = TRUE;
1966
1967                 pci_unmap_single(pdev,
1968                                  buffer_info->dma,
1969                                  buffer_info->length,
1970                                  PCI_DMA_FROMDEVICE);
1971
1972                 length = le16_to_cpu(rx_desc->length);
1973
1974                 if(unlikely(!(status & IXGB_RX_DESC_STATUS_EOP))) {
1975
1976                         /* All receives must fit into a single buffer */
1977
1978                         IXGB_DBG("Receive packet consumed multiple buffers "
1979                                          "length<%x>\n", length);
1980
1981                         dev_kfree_skb_irq(skb);
1982                         goto rxdesc_done;
1983                 }
1984
1985                 if (unlikely(rx_desc->errors
1986                              & (IXGB_RX_DESC_ERRORS_CE | IXGB_RX_DESC_ERRORS_SE
1987                                 | IXGB_RX_DESC_ERRORS_P |
1988                                 IXGB_RX_DESC_ERRORS_RXE))) {
1989
1990                         dev_kfree_skb_irq(skb);
1991                         goto rxdesc_done;
1992                 }
1993
1994                 /* code added for copybreak, this should improve
1995                  * performance for small packets with large amounts
1996                  * of reassembly being done in the stack */
1997 #define IXGB_CB_LENGTH 256
1998                 if (length < IXGB_CB_LENGTH) {
1999                         struct sk_buff *new_skb =
2000                             dev_alloc_skb(length + NET_IP_ALIGN);
2001                         if (new_skb) {
2002                                 skb_reserve(new_skb, NET_IP_ALIGN);
2003                                 new_skb->dev = netdev;
2004                                 memcpy(new_skb->data - NET_IP_ALIGN,
2005                                        skb->data - NET_IP_ALIGN,
2006                                        length + NET_IP_ALIGN);
2007                                 /* save the skb in buffer_info as good */
2008                                 buffer_info->skb = skb;
2009                                 skb = new_skb;
2010                         }
2011                 }
2012                 /* end copybreak code */
2013
2014                 /* Good Receive */
2015                 skb_put(skb, length);
2016
2017                 /* Receive Checksum Offload */
2018                 ixgb_rx_checksum(adapter, rx_desc, skb);
2019
2020                 skb->protocol = eth_type_trans(skb, netdev);
2021 #ifdef CONFIG_IXGB_NAPI
2022                 if(adapter->vlgrp && (status & IXGB_RX_DESC_STATUS_VP)) {
2023                         vlan_hwaccel_receive_skb(skb, adapter->vlgrp,
2024                                 le16_to_cpu(rx_desc->special) &
2025                                         IXGB_RX_DESC_SPECIAL_VLAN_MASK);
2026                 } else {
2027                         netif_receive_skb(skb);
2028                 }
2029 #else /* CONFIG_IXGB_NAPI */
2030                 if(adapter->vlgrp && (status & IXGB_RX_DESC_STATUS_VP)) {
2031                         vlan_hwaccel_rx(skb, adapter->vlgrp,
2032                                 le16_to_cpu(rx_desc->special) &
2033                                         IXGB_RX_DESC_SPECIAL_VLAN_MASK);
2034                 } else {
2035                         netif_rx(skb);
2036                 }
2037 #endif /* CONFIG_IXGB_NAPI */
2038                 netdev->last_rx = jiffies;
2039
2040 rxdesc_done:
2041                 /* clean up descriptor, might be written over by hw */
2042                 rx_desc->status = 0;
2043
2044                 /* use prefetched values */
2045                 rx_desc = next_rxd;
2046                 buffer_info = next_buffer;
2047         }
2048
2049         rx_ring->next_to_clean = i;
2050
2051         ixgb_alloc_rx_buffers(adapter);
2052
2053         return cleaned;
2054 }
2055
2056 /**
2057  * ixgb_alloc_rx_buffers - Replace used receive buffers
2058  * @adapter: address of board private structure
2059  **/
2060
2061 static void
2062 ixgb_alloc_rx_buffers(struct ixgb_adapter *adapter)
2063 {
2064         struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
2065         struct net_device *netdev = adapter->netdev;
2066         struct pci_dev *pdev = adapter->pdev;
2067         struct ixgb_rx_desc *rx_desc;
2068         struct ixgb_buffer *buffer_info;
2069         struct sk_buff *skb;
2070         unsigned int i;
2071         int num_group_tail_writes;
2072         long cleancount;
2073
2074         i = rx_ring->next_to_use;
2075         buffer_info = &rx_ring->buffer_info[i];
2076         cleancount = IXGB_DESC_UNUSED(rx_ring);
2077
2078         num_group_tail_writes = IXGB_RX_BUFFER_WRITE;
2079
2080         /* leave three descriptors unused */
2081         while(--cleancount > 2) {
2082                 /* recycle! its good for you */
2083                 if (!(skb = buffer_info->skb))
2084                         skb = dev_alloc_skb(adapter->rx_buffer_len
2085                                             + NET_IP_ALIGN);
2086                 else {
2087                         skb_trim(skb, 0);
2088                         goto map_skb;
2089                 }
2090
2091                 if (unlikely(!skb)) {
2092                         /* Better luck next round */
2093                         adapter->alloc_rx_buff_failed++;
2094                         break;
2095                 }
2096
2097                 /* Make buffer alignment 2 beyond a 16 byte boundary
2098                  * this will result in a 16 byte aligned IP header after
2099                  * the 14 byte MAC header is removed
2100                  */
2101                 skb_reserve(skb, NET_IP_ALIGN);
2102
2103                 skb->dev = netdev;
2104
2105                 buffer_info->skb = skb;
2106                 buffer_info->length = adapter->rx_buffer_len;
2107 map_skb:
2108                 buffer_info->dma = pci_map_single(pdev,
2109                                                   skb->data,
2110                                                   adapter->rx_buffer_len,
2111                                                   PCI_DMA_FROMDEVICE);
2112
2113                 rx_desc = IXGB_RX_DESC(*rx_ring, i);
2114                 rx_desc->buff_addr = cpu_to_le64(buffer_info->dma);
2115                 /* guarantee DD bit not set now before h/w gets descriptor
2116                  * this is the rest of the workaround for h/w double
2117                  * writeback. */
2118                 rx_desc->status = 0;
2119
2120
2121                 if(++i == rx_ring->count) i = 0;
2122                 buffer_info = &rx_ring->buffer_info[i];
2123         }
2124
2125         if (likely(rx_ring->next_to_use != i)) {
2126                 rx_ring->next_to_use = i;
2127                 if (unlikely(i-- == 0))
2128                         i = (rx_ring->count - 1);
2129
2130                 /* Force memory writes to complete before letting h/w
2131                  * know there are new descriptors to fetch.  (Only
2132                  * applicable for weak-ordered memory model archs, such
2133                  * as IA-64). */
2134                 wmb();
2135                 IXGB_WRITE_REG(&adapter->hw, RDT, i);
2136         }
2137 }
2138
2139 /**
2140  * ixgb_vlan_rx_register - enables or disables vlan tagging/stripping.
2141  *
2142  * @param netdev network interface device structure
2143  * @param grp indicates to enable or disable tagging/stripping
2144  **/
2145 static void
2146 ixgb_vlan_rx_register(struct net_device *netdev, struct vlan_group *grp)
2147 {
2148         struct ixgb_adapter *adapter = netdev_priv(netdev);
2149         uint32_t ctrl, rctl;
2150
2151         ixgb_irq_disable(adapter);
2152         adapter->vlgrp = grp;
2153
2154         if(grp) {
2155                 /* enable VLAN tag insert/strip */
2156                 ctrl = IXGB_READ_REG(&adapter->hw, CTRL0);
2157                 ctrl |= IXGB_CTRL0_VME;
2158                 IXGB_WRITE_REG(&adapter->hw, CTRL0, ctrl);
2159
2160                 /* enable VLAN receive filtering */
2161
2162                 rctl = IXGB_READ_REG(&adapter->hw, RCTL);
2163                 rctl |= IXGB_RCTL_VFE;
2164                 rctl &= ~IXGB_RCTL_CFIEN;
2165                 IXGB_WRITE_REG(&adapter->hw, RCTL, rctl);
2166         } else {
2167                 /* disable VLAN tag insert/strip */
2168
2169                 ctrl = IXGB_READ_REG(&adapter->hw, CTRL0);
2170                 ctrl &= ~IXGB_CTRL0_VME;
2171                 IXGB_WRITE_REG(&adapter->hw, CTRL0, ctrl);
2172
2173                 /* disable VLAN filtering */
2174
2175                 rctl = IXGB_READ_REG(&adapter->hw, RCTL);
2176                 rctl &= ~IXGB_RCTL_VFE;
2177                 IXGB_WRITE_REG(&adapter->hw, RCTL, rctl);
2178         }
2179
2180         ixgb_irq_enable(adapter);
2181 }
2182
2183 static void
2184 ixgb_vlan_rx_add_vid(struct net_device *netdev, uint16_t vid)
2185 {
2186         struct ixgb_adapter *adapter = netdev_priv(netdev);
2187         uint32_t vfta, index;
2188
2189         /* add VID to filter table */
2190
2191         index = (vid >> 5) & 0x7F;
2192         vfta = IXGB_READ_REG_ARRAY(&adapter->hw, VFTA, index);
2193         vfta |= (1 << (vid & 0x1F));
2194         ixgb_write_vfta(&adapter->hw, index, vfta);
2195 }
2196
2197 static void
2198 ixgb_vlan_rx_kill_vid(struct net_device *netdev, uint16_t vid)
2199 {
2200         struct ixgb_adapter *adapter = netdev_priv(netdev);
2201         uint32_t vfta, index;
2202
2203         ixgb_irq_disable(adapter);
2204
2205         if(adapter->vlgrp)
2206                 adapter->vlgrp->vlan_devices[vid] = NULL;
2207
2208         ixgb_irq_enable(adapter);
2209
2210         /* remove VID from filter table*/
2211
2212         index = (vid >> 5) & 0x7F;
2213         vfta = IXGB_READ_REG_ARRAY(&adapter->hw, VFTA, index);
2214         vfta &= ~(1 << (vid & 0x1F));
2215         ixgb_write_vfta(&adapter->hw, index, vfta);
2216 }
2217
2218 static void
2219 ixgb_restore_vlan(struct ixgb_adapter *adapter)
2220 {
2221         ixgb_vlan_rx_register(adapter->netdev, adapter->vlgrp);
2222
2223         if(adapter->vlgrp) {
2224                 uint16_t vid;
2225                 for(vid = 0; vid < VLAN_GROUP_ARRAY_LEN; vid++) {
2226                         if(!adapter->vlgrp->vlan_devices[vid])
2227                                 continue;
2228                         ixgb_vlan_rx_add_vid(adapter->netdev, vid);
2229                 }
2230         }
2231 }
2232
2233 #ifdef CONFIG_NET_POLL_CONTROLLER
2234 /*
2235  * Polling 'interrupt' - used by things like netconsole to send skbs
2236  * without having to re-enable interrupts. It's not called while
2237  * the interrupt routine is executing.
2238  */
2239
2240 static void ixgb_netpoll(struct net_device *dev)
2241 {
2242         struct ixgb_adapter *adapter = dev->priv;
2243
2244         disable_irq(adapter->pdev->irq);
2245         ixgb_intr(adapter->pdev->irq, dev, NULL);
2246         enable_irq(adapter->pdev->irq);
2247 }
2248 #endif
2249
2250 /* ixgb_main.c */