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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_rar_set(hw, netdev->dev_addr, 0);
 242         ixgb_set_multi(netdev);
 243
 244         ixgb_restore_vlan(adapter);
 245
 246         ixgb_configure_tx(adapter);
 247         ixgb_setup_rctl(adapter);
 248         ixgb_configure_rx(adapter);
 249         ixgb_alloc_rx_buffers(adapter);
 250
 251         /* disable interrupts and get the hardware into a known state */
 252         IXGB_WRITE_REG(&adapter->hw, IMC, 0xffffffff);
 253
 254 #ifdef CONFIG_PCI_MSI
 255         {
 256         boolean_t pcix = (IXGB_READ_REG(&adapter->hw, STATUS) &
 257                                                   IXGB_STATUS_PCIX_MODE) ? TRUE : FALSE;
 258         adapter->have_msi = TRUE;
 259
 260         if (!pcix)
 261            adapter->have_msi = FALSE;
 262         else if((err = pci_enable_msi(adapter->pdev))) {
 263                 DPRINTK(PROBE, ERR,
 264                  "Unable to allocate MSI interrupt Error: %d\n", err);
 265                 adapter->have_msi = FALSE;
 266                 /* proceed to try to request regular interrupt */
 267         }
 268         }
 269
 270 #endif
 271         if((err = request_irq(adapter->pdev->irq, &ixgb_intr,
 272                                   SA_SHIRQ | SA_SAMPLE_RANDOM,
 273                                   netdev->name, netdev))) {
 274                 DPRINTK(PROBE, ERR,
 275                  "Unable to allocate interrupt Error: %d\n", err);
 276                 return err;
 277         }
 278
 279         if((hw->max_frame_size != max_frame) ||
 280                 (hw->max_frame_size !=
 281                 (IXGB_READ_REG(hw, MFS) >> IXGB_MFS_SHIFT))) {
 282
 283                 hw->max_frame_size = max_frame;
 284
 285                 IXGB_WRITE_REG(hw, MFS, hw->max_frame_size << IXGB_MFS_SHIFT);
 286
 287                 if(hw->max_frame_size >
 288                    IXGB_MAX_ENET_FRAME_SIZE_WITHOUT_FCS + ENET_FCS_LENGTH) {
 289                         uint32_t ctrl0 = IXGB_READ_REG(hw, CTRL0);
 290
 291                         if(!(ctrl0 & IXGB_CTRL0_JFE)) {
 292                                 ctrl0 |= IXGB_CTRL0_JFE;
 293                                 IXGB_WRITE_REG(hw, CTRL0, ctrl0);
 294                         }
 295                 }
 296         }
 297
 298         mod_timer(&adapter->watchdog_timer, jiffies);
 299
 300 #ifdef CONFIG_IXGB_NAPI
 301         netif_poll_enable(netdev);
 302 #endif
 303         ixgb_irq_enable(adapter);
 304
 305         return 0;
 306 }
 307
 308 void
 309 ixgb_down(struct ixgb_adapter *adapter, boolean_t kill_watchdog)
 310 {
 311         struct net_device *netdev = adapter->netdev;
 312
 313         ixgb_irq_disable(adapter);
 314         free_irq(adapter->pdev->irq, netdev);
 315 #ifdef CONFIG_PCI_MSI
 316         if(adapter->have_msi == TRUE)
 317                 pci_disable_msi(adapter->pdev);
 318
 319 #endif
 320         if(kill_watchdog)
 321                 del_timer_sync(&adapter->watchdog_timer);
 322 #ifdef CONFIG_IXGB_NAPI
 323         netif_poll_disable(netdev);
 324 #endif
 325         adapter->link_speed = 0;
 326         adapter->link_duplex = 0;
 327         netif_carrier_off(netdev);
 328         netif_stop_queue(netdev);
 329
 330         ixgb_reset(adapter);
 331         ixgb_clean_tx_ring(adapter);
 332         ixgb_clean_rx_ring(adapter);
 333 }
 334
 335 void
 336 ixgb_reset(struct ixgb_adapter *adapter)
 337 {
 338
 339         ixgb_adapter_stop(&adapter->hw);
 340         if(!ixgb_init_hw(&adapter->hw))
 341                 DPRINTK(PROBE, ERR, "ixgb_init_hw failed.\n");
 342 }
 343
 344 /**
 345  * ixgb_probe - Device Initialization Routine
 346  * @pdev: PCI device information struct
 347  * @ent: entry in ixgb_pci_tbl
 348  *
 349  * Returns 0 on success, negative on failure
 350  *
 351  * ixgb_probe initializes an adapter identified by a pci_dev structure.
 352  * The OS initialization, configuring of the adapter private structure,
 353  * and a hardware reset occur.
 354  **/
 355
 356 static int __devinit
 357 ixgb_probe(struct pci_dev *pdev,
 358                 const struct pci_device_id *ent)
 359 {
 360         struct net_device *netdev = NULL;
 361         struct ixgb_adapter *adapter;
 362         static int cards_found = 0;
 363         unsigned long mmio_start;
 364         int mmio_len;
 365         int pci_using_dac;
 366         int i;
 367         int err;
 368
 369         if((err = pci_enable_device(pdev)))
 370                 return err;
 371
 372         if(!(err = pci_set_dma_mask(pdev, DMA_64BIT_MASK)) &&
 373            !(err = pci_set_consistent_dma_mask(pdev, DMA_64BIT_MASK))) {
 374                 pci_using_dac = 1;
 375         } else {
 376                 if((err = pci_set_dma_mask(pdev, DMA_32BIT_MASK)) ||
 377                    (err = pci_set_consistent_dma_mask(pdev, DMA_32BIT_MASK))) {
 378                         printk(KERN_ERR
 379                          "ixgb: No usable DMA configuration, aborting\n");
 380                         goto err_dma_mask;
 381                 }
 382                 pci_using_dac = 0;
 383         }
 384
 385         if((err = pci_request_regions(pdev, ixgb_driver_name)))
 386                 goto err_request_regions;
 387
 388         pci_set_master(pdev);
 389
 390         netdev = alloc_etherdev(sizeof(struct ixgb_adapter));
 391         if(!netdev) {
 392                 err = -ENOMEM;
 393                 goto err_alloc_etherdev;
 394         }
 395
 396         SET_MODULE_OWNER(netdev);
 397         SET_NETDEV_DEV(netdev, &pdev->dev);
 398
 399         pci_set_drvdata(pdev, netdev);
 400         adapter = netdev_priv(netdev);
 401         adapter->netdev = netdev;
 402         adapter->pdev = pdev;
 403         adapter->hw.back = adapter;
 404         adapter->msg_enable = netif_msg_init(debug, DEFAULT_DEBUG_LEVEL_SHIFT);
 405
 406         mmio_start = pci_resource_start(pdev, BAR_0);
 407         mmio_len = pci_resource_len(pdev, BAR_0);
 408
 409         adapter->hw.hw_addr = ioremap(mmio_start, mmio_len);
 410         if(!adapter->hw.hw_addr) {
 411                 err = -EIO;
 412                 goto err_ioremap;
 413         }
 414
 415         for(i = BAR_1; i <= BAR_5; i++) {
 416                 if(pci_resource_len(pdev, i) == 0)
 417                         continue;
 418                 if(pci_resource_flags(pdev, i) & IORESOURCE_IO) {
 419                         adapter->hw.io_base = pci_resource_start(pdev, i);
 420                         break;
 421                 }
 422         }
 423
 424         netdev->open = &ixgb_open;
 425         netdev->stop = &ixgb_close;
 426         netdev->hard_start_xmit = &ixgb_xmit_frame;
 427         netdev->get_stats = &ixgb_get_stats;
 428         netdev->set_multicast_list = &ixgb_set_multi;
 429         netdev->set_mac_address = &ixgb_set_mac;
 430         netdev->change_mtu = &ixgb_change_mtu;
 431         ixgb_set_ethtool_ops(netdev);
 432         netdev->tx_timeout = &ixgb_tx_timeout;
 433         netdev->watchdog_timeo = 5 * HZ;
 434 #ifdef CONFIG_IXGB_NAPI
 435         netdev->poll = &ixgb_clean;
 436         netdev->weight = 64;
 437 #endif
 438         netdev->vlan_rx_register = ixgb_vlan_rx_register;
 439         netdev->vlan_rx_add_vid = ixgb_vlan_rx_add_vid;
 440         netdev->vlan_rx_kill_vid = ixgb_vlan_rx_kill_vid;
 441 #ifdef CONFIG_NET_POLL_CONTROLLER
 442         netdev->poll_controller = ixgb_netpoll;
 443 #endif
 444
 445         strcpy(netdev->name, pci_name(pdev));
 446         netdev->mem_start = mmio_start;
 447         netdev->mem_end = mmio_start + mmio_len;
 448         netdev->base_addr = adapter->hw.io_base;
 449
 450         adapter->bd_number = cards_found;
 451         adapter->link_speed = 0;
 452         adapter->link_duplex = 0;
 453
 454         /* setup the private structure */
 455
 456         if((err = ixgb_sw_init(adapter)))
 457                 goto err_sw_init;
 458
 459         netdev->features = NETIF_F_SG |
 460                            NETIF_F_HW_CSUM |
 461                            NETIF_F_HW_VLAN_TX |
 462                            NETIF_F_HW_VLAN_RX |
 463                            NETIF_F_HW_VLAN_FILTER;
 464 #ifdef NETIF_F_TSO
 465         netdev->features |= NETIF_F_TSO;
 466 #endif
 467 #ifdef NETIF_F_LLTX
 468         netdev->features |= NETIF_F_LLTX;
 469 #endif
 470
 471         if(pci_using_dac)
 472                 netdev->features |= NETIF_F_HIGHDMA;
 473
 474         /* make sure the EEPROM is good */
 475
 476         if(!ixgb_validate_eeprom_checksum(&adapter->hw)) {
 477                 DPRINTK(PROBE, ERR, "The EEPROM Checksum Is Not Valid\n");
 478                 err = -EIO;
 479                 goto err_eeprom;
 480         }
 481
 482         ixgb_get_ee_mac_addr(&adapter->hw, netdev->dev_addr);
 483         memcpy(netdev->perm_addr, netdev->dev_addr, netdev->addr_len);
 484
 485         if(!is_valid_ether_addr(netdev->perm_addr)) {
 486                 DPRINTK(PROBE, ERR, "Invalid MAC Address\n");
 487                 err = -EIO;
 488                 goto err_eeprom;
 489         }
 490
 491         adapter->part_num = ixgb_get_ee_pba_number(&adapter->hw);
 492
 493         init_timer(&adapter->watchdog_timer);
 494         adapter->watchdog_timer.function = &ixgb_watchdog;
 495         adapter->watchdog_timer.data = (unsigned long)adapter;
 496
 497         INIT_WORK(&adapter->tx_timeout_task,
 498                   (void (*)(void *))ixgb_tx_timeout_task, netdev);
 499
 500         strcpy(netdev->name, "eth%d");
 501         if((err = register_netdev(netdev)))
 502                 goto err_register;
 503
 504         /* we're going to reset, so assume we have no link for now */
 505
 506         netif_carrier_off(netdev);
 507         netif_stop_queue(netdev);
 508
 509         DPRINTK(PROBE, INFO, "Intel(R) PRO/10GbE Network Connection\n");
 510         ixgb_check_options(adapter);
 511         /* reset the hardware with the new settings */
 512
 513         ixgb_reset(adapter);
 514
 515         cards_found++;
 516         return 0;
 517
 518 err_register:
 519 err_sw_init:
 520 err_eeprom:
 521         iounmap(adapter->hw.hw_addr);
 522 err_ioremap:
 523         free_netdev(netdev);
 524 err_alloc_etherdev:
 525         pci_release_regions(pdev);
 526 err_request_regions:
 527 err_dma_mask:
 528         pci_disable_device(pdev);
 529         return err;
 530 }
 531
 532 /**
 533  * ixgb_remove - Device Removal Routine
 534  * @pdev: PCI device information struct
 535  *
 536  * ixgb_remove is called by the PCI subsystem to alert the driver
 537  * that it should release a PCI device.  The could be caused by a
 538  * Hot-Plug event, or because the driver is going to be removed from
 539  * memory.
 540  **/
 541
 542 static void __devexit
 543 ixgb_remove(struct pci_dev *pdev)
 544 {
 545         struct net_device *netdev = pci_get_drvdata(pdev);
 546         struct ixgb_adapter *adapter = netdev_priv(netdev);
 547
 548         unregister_netdev(netdev);
 549
 550         iounmap(adapter->hw.hw_addr);
 551         pci_release_regions(pdev);
 552
 553         free_netdev(netdev);
 554 }
 555
 556 /**
 557  * ixgb_sw_init - Initialize general software structures (struct ixgb_adapter)
 558  * @adapter: board private structure to initialize
 559  *
 560  * ixgb_sw_init initializes the Adapter private data structure.
 561  * Fields are initialized based on PCI device information and
 562  * OS network device settings (MTU size).
 563  **/
 564
 565 static int __devinit
 566 ixgb_sw_init(struct ixgb_adapter *adapter)
 567 {
 568         struct ixgb_hw *hw = &adapter->hw;
 569         struct net_device *netdev = adapter->netdev;
 570         struct pci_dev *pdev = adapter->pdev;
 571
 572         /* PCI config space info */
 573
 574         hw->vendor_id = pdev->vendor;
 575         hw->device_id = pdev->device;
 576         hw->subsystem_vendor_id = pdev->subsystem_vendor;
 577         hw->subsystem_id = pdev->subsystem_device;
 578
 579         adapter->rx_buffer_len = IXGB_RXBUFFER_2048;
 580
 581         hw->max_frame_size = netdev->mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;
 582
 583         if((hw->device_id == IXGB_DEVICE_ID_82597EX)
 584            || (hw->device_id == IXGB_DEVICE_ID_82597EX_CX4)
 585            || (hw->device_id == IXGB_DEVICE_ID_82597EX_LR)
 586            || (hw->device_id == IXGB_DEVICE_ID_82597EX_SR))
 587                         hw->mac_type = ixgb_82597;
 588         else {
 589                 /* should never have loaded on this device */
 590                 DPRINTK(PROBE, ERR, "unsupported device id\n");
 591         }
 592
 593         /* enable flow control to be programmed */
 594         hw->fc.send_xon = 1;
 595
 596         atomic_set(&adapter->irq_sem, 1);
 597         spin_lock_init(&adapter->tx_lock);
 598
 599         return 0;
 600 }
 601
 602 /**
 603  * ixgb_open - Called when a network interface is made active
 604  * @netdev: network interface device structure
 605  *
 606  * Returns 0 on success, negative value on failure
 607  *
 608  * The open entry point is called when a network interface is made
 609  * active by the system (IFF_UP).  At this point all resources needed
 610  * for transmit and receive operations are allocated, the interrupt
 611  * handler is registered with the OS, the watchdog timer is started,
 612  * and the stack is notified that the interface is ready.
 613  **/
 614
 615 static int
 616 ixgb_open(struct net_device *netdev)
 617 {
 618         struct ixgb_adapter *adapter = netdev_priv(netdev);
 619         int err;
 620
 621         /* allocate transmit descriptors */
 622
 623         if((err = ixgb_setup_tx_resources(adapter)))
 624                 goto err_setup_tx;
 625
 626         /* allocate receive descriptors */
 627
 628         if((err = ixgb_setup_rx_resources(adapter)))
 629                 goto err_setup_rx;
 630
 631         if((err = ixgb_up(adapter)))
 632                 goto err_up;
 633
 634         return 0;
 635
 636 err_up:
 637         ixgb_free_rx_resources(adapter);
 638 err_setup_rx:
 639         ixgb_free_tx_resources(adapter);
 640 err_setup_tx:
 641         ixgb_reset(adapter);
 642
 643         return err;
 644 }
 645
 646 /**
 647  * ixgb_close - Disables a network interface
 648  * @netdev: network interface device structure
 649  *
 650  * Returns 0, this is not allowed to fail
 651  *
 652  * The close entry point is called when an interface is de-activated
 653  * by the OS.  The hardware is still under the drivers control, but
 654  * needs to be disabled.  A global MAC reset is issued to stop the
 655  * hardware, and all transmit and receive resources are freed.
 656  **/
 657
 658 static int
 659 ixgb_close(struct net_device *netdev)
 660 {
 661         struct ixgb_adapter *adapter = netdev_priv(netdev);
 662
 663         ixgb_down(adapter, TRUE);
 664
 665         ixgb_free_tx_resources(adapter);
 666         ixgb_free_rx_resources(adapter);
 667
 668         return 0;
 669 }
 670
 671 /**
 672  * ixgb_setup_tx_resources - allocate Tx resources (Descriptors)
 673  * @adapter: board private structure
 674  *
 675  * Return 0 on success, negative on failure
 676  **/
 677
 678 int
 679 ixgb_setup_tx_resources(struct ixgb_adapter *adapter)
 680 {
 681         struct ixgb_desc_ring *txdr = &adapter->tx_ring;
 682         struct pci_dev *pdev = adapter->pdev;
 683         int size;
 684
 685         size = sizeof(struct ixgb_buffer) * txdr->count;
 686         txdr->buffer_info = vmalloc(size);
 687         if(!txdr->buffer_info) {
 688                 DPRINTK(PROBE, ERR,
 689                  "Unable to allocate transmit descriptor ring memory\n");
 690                 return -ENOMEM;
 691         }
 692         memset(txdr->buffer_info, 0, size);
 693
 694         /* round up to nearest 4K */
 695
 696         txdr->size = txdr->count * sizeof(struct ixgb_tx_desc);
 697         IXGB_ROUNDUP(txdr->size, 4096);
 698
 699         txdr->desc = pci_alloc_consistent(pdev, txdr->size, &txdr->dma);
 700         if(!txdr->desc) {
 701                 vfree(txdr->buffer_info);
 702                 DPRINTK(PROBE, ERR,
 703                  "Unable to allocate transmit descriptor memory\n");
 704                 return -ENOMEM;
 705         }
 706         memset(txdr->desc, 0, txdr->size);
 707
 708         txdr->next_to_use = 0;
 709         txdr->next_to_clean = 0;
 710
 711         return 0;
 712 }
 713
 714 /**
 715  * ixgb_configure_tx - Configure 82597 Transmit Unit after Reset.
 716  * @adapter: board private structure
 717  *
 718  * Configure the Tx unit of the MAC after a reset.
 719  **/
 720
 721 static void
 722 ixgb_configure_tx(struct ixgb_adapter *adapter)
 723 {
 724         uint64_t tdba = adapter->tx_ring.dma;
 725         uint32_t tdlen = adapter->tx_ring.count * sizeof(struct ixgb_tx_desc);
 726         uint32_t tctl;
 727         struct ixgb_hw *hw = &adapter->hw;
 728
 729         /* Setup the Base and Length of the Tx Descriptor Ring
 730          * tx_ring.dma can be either a 32 or 64 bit value
 731          */
 732
 733         IXGB_WRITE_REG(hw, TDBAL, (tdba & 0x00000000ffffffffULL));
 734         IXGB_WRITE_REG(hw, TDBAH, (tdba >> 32));
 735
 736         IXGB_WRITE_REG(hw, TDLEN, tdlen);
 737
 738         /* Setup the HW Tx Head and Tail descriptor pointers */
 739
 740         IXGB_WRITE_REG(hw, TDH, 0);
 741         IXGB_WRITE_REG(hw, TDT, 0);
 742
 743         /* don't set up txdctl, it induces performance problems if configured
 744          * incorrectly */
 745         /* Set the Tx Interrupt Delay register */
 746
 747         IXGB_WRITE_REG(hw, TIDV, adapter->tx_int_delay);
 748
 749         /* Program the Transmit Control Register */
 750
 751         tctl = IXGB_TCTL_TCE | IXGB_TCTL_TXEN | IXGB_TCTL_TPDE;
 752         IXGB_WRITE_REG(hw, TCTL, tctl);
 753
 754         /* Setup Transmit Descriptor Settings for this adapter */
 755         adapter->tx_cmd_type =
 756                 IXGB_TX_DESC_TYPE
 757                 | (adapter->tx_int_delay_enable ? IXGB_TX_DESC_CMD_IDE : 0);
 758 }
 759
 760 /**
 761  * ixgb_setup_rx_resources - allocate Rx resources (Descriptors)
 762  * @adapter: board private structure
 763  *
 764  * Returns 0 on success, negative on failure
 765  **/
 766
 767 int
 768 ixgb_setup_rx_resources(struct ixgb_adapter *adapter)
 769 {
 770         struct ixgb_desc_ring *rxdr = &adapter->rx_ring;
 771         struct pci_dev *pdev = adapter->pdev;
 772         int size;
 773
 774         size = sizeof(struct ixgb_buffer) * rxdr->count;
 775         rxdr->buffer_info = vmalloc(size);
 776         if(!rxdr->buffer_info) {
 777                 DPRINTK(PROBE, ERR,
 778                  "Unable to allocate receive descriptor ring\n");
 779                 return -ENOMEM;
 780         }
 781         memset(rxdr->buffer_info, 0, size);
 782
 783         /* Round up to nearest 4K */
 784
 785         rxdr->size = rxdr->count * sizeof(struct ixgb_rx_desc);
 786         IXGB_ROUNDUP(rxdr->size, 4096);
 787
 788         rxdr->desc = pci_alloc_consistent(pdev, rxdr->size, &rxdr->dma);
 789
 790         if(!rxdr->desc) {
 791                 vfree(rxdr->buffer_info);
 792                 DPRINTK(PROBE, ERR,
 793                  "Unable to allocate receive descriptors\n");
 794                 return -ENOMEM;
 795         }
 796         memset(rxdr->desc, 0, rxdr->size);
 797
 798         rxdr->next_to_clean = 0;
 799         rxdr->next_to_use = 0;
 800
 801         return 0;
 802 }
 803
 804 /**
 805  * ixgb_setup_rctl - configure the receive control register
 806  * @adapter: Board private structure
 807  **/
 808
 809 static void
 810 ixgb_setup_rctl(struct ixgb_adapter *adapter)
 811 {
 812         uint32_t rctl;
 813
 814         rctl = IXGB_READ_REG(&adapter->hw, RCTL);
 815
 816         rctl &= ~(3 << IXGB_RCTL_MO_SHIFT);
 817
 818         rctl |=
 819                 IXGB_RCTL_BAM | IXGB_RCTL_RDMTS_1_2 |
 820                 IXGB_RCTL_RXEN | IXGB_RCTL_CFF |
 821                 (adapter->hw.mc_filter_type << IXGB_RCTL_MO_SHIFT);
 822
 823         rctl |= IXGB_RCTL_SECRC;
 824
 825         switch (adapter->rx_buffer_len) {
 826         case IXGB_RXBUFFER_2048:
 827         default:
 828                 rctl |= IXGB_RCTL_BSIZE_2048;
 829                 break;
 830         case IXGB_RXBUFFER_4096:
 831                 rctl |= IXGB_RCTL_BSIZE_4096;
 832                 break;
 833         case IXGB_RXBUFFER_8192:
 834                 rctl |= IXGB_RCTL_BSIZE_8192;
 835                 break;
 836         case IXGB_RXBUFFER_16384:
 837                 rctl |= IXGB_RCTL_BSIZE_16384;
 838                 break;
 839         }
 840
 841         IXGB_WRITE_REG(&adapter->hw, RCTL, rctl);
 842 }
 843
 844 /**
 845  * ixgb_configure_rx - Configure 82597 Receive Unit after Reset.
 846  * @adapter: board private structure
 847  *
 848  * Configure the Rx unit of the MAC after a reset.
 849  **/
 850
 851 static void
 852 ixgb_configure_rx(struct ixgb_adapter *adapter)
 853 {
 854         uint64_t rdba = adapter->rx_ring.dma;
 855         uint32_t rdlen = adapter->rx_ring.count * sizeof(struct ixgb_rx_desc);
 856         struct ixgb_hw *hw = &adapter->hw;
 857         uint32_t rctl;
 858         uint32_t rxcsum;
 859         uint32_t rxdctl;
 860
 861         /* make sure receives are disabled while setting up the descriptors */
 862
 863         rctl = IXGB_READ_REG(hw, RCTL);
 864         IXGB_WRITE_REG(hw, RCTL, rctl & ~IXGB_RCTL_RXEN);
 865
 866         /* set the Receive Delay Timer Register */
 867
 868         IXGB_WRITE_REG(hw, RDTR, adapter->rx_int_delay);
 869
 870         /* Setup the Base and Length of the Rx Descriptor Ring */
 871
 872         IXGB_WRITE_REG(hw, RDBAL, (rdba & 0x00000000ffffffffULL));
 873         IXGB_WRITE_REG(hw, RDBAH, (rdba >> 32));
 874
 875         IXGB_WRITE_REG(hw, RDLEN, rdlen);
 876
 877         /* Setup the HW Rx Head and Tail Descriptor Pointers */
 878         IXGB_WRITE_REG(hw, RDH, 0);
 879         IXGB_WRITE_REG(hw, RDT, 0);
 880
 881         /* set up pre-fetching of receive buffers so we get some before we
 882          * run out (default hardware behavior is to run out before fetching
 883          * more).  This sets up to fetch if HTHRESH rx descriptors are avail
 884          * and the descriptors in hw cache are below PTHRESH.  This avoids
 885          * the hardware behavior of fetching <=512 descriptors in a single
 886          * burst that pre-empts all other activity, usually causing fifo
 887          * overflows. */
 888         /* use WTHRESH to burst write 16 descriptors or burst when RXT0 */
 889         rxdctl = RXDCTL_WTHRESH_DEFAULT << IXGB_RXDCTL_WTHRESH_SHIFT |
 890                  RXDCTL_HTHRESH_DEFAULT << IXGB_RXDCTL_HTHRESH_SHIFT |
 891                  RXDCTL_PTHRESH_DEFAULT << IXGB_RXDCTL_PTHRESH_SHIFT;
 892         IXGB_WRITE_REG(hw, RXDCTL, rxdctl);
 893
 894         /* Enable Receive Checksum Offload for TCP and UDP */
 895         if(adapter->rx_csum == TRUE) {
 896                 rxcsum = IXGB_READ_REG(hw, RXCSUM);
 897                 rxcsum |= IXGB_RXCSUM_TUOFL;
 898                 IXGB_WRITE_REG(hw, RXCSUM, rxcsum);
 899         }
 900
 901         /* Enable Receives */
 902
 903         IXGB_WRITE_REG(hw, RCTL, rctl);
 904 }
 905
 906 /**
 907  * ixgb_free_tx_resources - Free Tx Resources
 908  * @adapter: board private structure
 909  *
 910  * Free all transmit software resources
 911  **/
 912
 913 void
 914 ixgb_free_tx_resources(struct ixgb_adapter *adapter)
 915 {
 916         struct pci_dev *pdev = adapter->pdev;
 917
 918         ixgb_clean_tx_ring(adapter);
 919
 920         vfree(adapter->tx_ring.buffer_info);
 921         adapter->tx_ring.buffer_info = NULL;
 922
 923         pci_free_consistent(pdev, adapter->tx_ring.size,
 924                             adapter->tx_ring.desc, adapter->tx_ring.dma);
 925
 926         adapter->tx_ring.desc = NULL;
 927 }
 928
 929 static inline void
 930 ixgb_unmap_and_free_tx_resource(struct ixgb_adapter *adapter,
 931                                         struct ixgb_buffer *buffer_info)
 932 {
 933         struct pci_dev *pdev = adapter->pdev;
 934
 935         if (buffer_info->dma)
 936                 pci_unmap_page(pdev, buffer_info->dma, buffer_info->length,
 937                                PCI_DMA_TODEVICE);
 938
 939         if (buffer_info->skb)
 940                 dev_kfree_skb_any(buffer_info->skb);
 941
 942         buffer_info->skb = NULL;
 943         buffer_info->dma = 0;
 944         buffer_info->time_stamp = 0;
 945         /* these fields must always be initialized in tx
 946          * buffer_info->length = 0;
 947          * buffer_info->next_to_watch = 0; */
 948 }
 949
 950 /**
 951  * ixgb_clean_tx_ring - Free Tx Buffers
 952  * @adapter: board private structure
 953  **/
 954
 955 static void
 956 ixgb_clean_tx_ring(struct ixgb_adapter *adapter)
 957 {
 958         struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
 959         struct ixgb_buffer *buffer_info;
 960         unsigned long size;
 961         unsigned int i;
 962
 963         /* Free all the Tx ring sk_buffs */
 964
 965         for(i = 0; i < tx_ring->count; i++) {
 966                 buffer_info = &tx_ring->buffer_info[i];
 967                 ixgb_unmap_and_free_tx_resource(adapter, buffer_info);
 968         }
 969
 970         size = sizeof(struct ixgb_buffer) * tx_ring->count;
 971         memset(tx_ring->buffer_info, 0, size);
 972
 973         /* Zero out the descriptor ring */
 974
 975         memset(tx_ring->desc, 0, tx_ring->size);
 976
 977         tx_ring->next_to_use = 0;
 978         tx_ring->next_to_clean = 0;
 979
 980         IXGB_WRITE_REG(&adapter->hw, TDH, 0);
 981         IXGB_WRITE_REG(&adapter->hw, TDT, 0);
 982 }
 983
 984 /**
 985  * ixgb_free_rx_resources - Free Rx Resources
 986  * @adapter: board private structure
 987  *
 988  * Free all receive software resources
 989  **/
 990
 991 void
 992 ixgb_free_rx_resources(struct ixgb_adapter *adapter)
 993 {
 994         struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
 995         struct pci_dev *pdev = adapter->pdev;
 996
 997         ixgb_clean_rx_ring(adapter);
 998
 999         vfree(rx_ring->buffer_info);
1000         rx_ring->buffer_info = NULL;
1001
1002         pci_free_consistent(pdev, rx_ring->size, rx_ring->desc, rx_ring->dma);
1003
1004         rx_ring->desc = NULL;
1005 }
1006
1007 /**
1008  * ixgb_clean_rx_ring - Free Rx Buffers
1009  * @adapter: board private structure
1010  **/
1011
1012 static void
1013 ixgb_clean_rx_ring(struct ixgb_adapter *adapter)
1014 {
1015         struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
1016         struct ixgb_buffer *buffer_info;
1017         struct pci_dev *pdev = adapter->pdev;
1018         unsigned long size;
1019         unsigned int i;
1020
1021         /* Free all the Rx ring sk_buffs */
1022
1023         for(i = 0; i < rx_ring->count; i++) {
1024                 buffer_info = &rx_ring->buffer_info[i];
1025                 if(buffer_info->skb) {
1026
1027                         pci_unmap_single(pdev,
1028                                          buffer_info->dma,
1029                                          buffer_info->length,
1030                                          PCI_DMA_FROMDEVICE);
1031
1032                         dev_kfree_skb(buffer_info->skb);
1033
1034                         buffer_info->skb = NULL;
1035                 }
1036         }
1037
1038         size = sizeof(struct ixgb_buffer) * rx_ring->count;
1039         memset(rx_ring->buffer_info, 0, size);
1040
1041         /* Zero out the descriptor ring */
1042
1043         memset(rx_ring->desc, 0, rx_ring->size);
1044
1045         rx_ring->next_to_clean = 0;
1046         rx_ring->next_to_use = 0;
1047
1048         IXGB_WRITE_REG(&adapter->hw, RDH, 0);
1049         IXGB_WRITE_REG(&adapter->hw, RDT, 0);
1050 }
1051
1052 /**
1053  * ixgb_set_mac - Change the Ethernet Address of the NIC
1054  * @netdev: network interface device structure
1055  * @p: pointer to an address structure
1056  *
1057  * Returns 0 on success, negative on failure
1058  **/
1059
1060 static int
1061 ixgb_set_mac(struct net_device *netdev, void *p)
1062 {
1063         struct ixgb_adapter *adapter = netdev_priv(netdev);
1064         struct sockaddr *addr = p;
1065
1066         if(!is_valid_ether_addr(addr->sa_data))
1067                 return -EADDRNOTAVAIL;
1068
1069         memcpy(netdev->dev_addr, addr->sa_data, netdev->addr_len);
1070
1071         ixgb_rar_set(&adapter->hw, addr->sa_data, 0);
1072
1073         return 0;
1074 }
1075
1076 /**
1077  * ixgb_set_multi - Multicast and Promiscuous mode set
1078  * @netdev: network interface device structure
1079  *
1080  * The set_multi entry point is called whenever the multicast address
1081  * list or the network interface flags are updated.  This routine is
1082  * responsible for configuring the hardware for proper multicast,
1083  * promiscuous mode, and all-multi behavior.
1084  **/
1085
1086 static void
1087 ixgb_set_multi(struct net_device *netdev)
1088 {
1089         struct ixgb_adapter *adapter = netdev_priv(netdev);
1090         struct ixgb_hw *hw = &adapter->hw;
1091         struct dev_mc_list *mc_ptr;
1092         uint32_t rctl;
1093         int i;
1094
1095         /* Check for Promiscuous and All Multicast modes */
1096
1097         rctl = IXGB_READ_REG(hw, RCTL);
1098
1099         if(netdev->flags & IFF_PROMISC) {
1100                 rctl |= (IXGB_RCTL_UPE | IXGB_RCTL_MPE);
1101         } else if(netdev->flags & IFF_ALLMULTI) {
1102                 rctl |= IXGB_RCTL_MPE;
1103                 rctl &= ~IXGB_RCTL_UPE;
1104         } else {
1105                 rctl &= ~(IXGB_RCTL_UPE | IXGB_RCTL_MPE);
1106         }
1107
1108         if(netdev->mc_count > IXGB_MAX_NUM_MULTICAST_ADDRESSES) {
1109                 rctl |= IXGB_RCTL_MPE;
1110                 IXGB_WRITE_REG(hw, RCTL, rctl);
1111         } else {
1112                 uint8_t mta[netdev->mc_count * IXGB_ETH_LENGTH_OF_ADDRESS];
1113
1114                 IXGB_WRITE_REG(hw, RCTL, rctl);
1115
1116                 for(i = 0, mc_ptr = netdev->mc_list; mc_ptr;
1117                         i++, mc_ptr = mc_ptr->next)
1118                         memcpy(&mta[i * IXGB_ETH_LENGTH_OF_ADDRESS],
1119                                    mc_ptr->dmi_addr, IXGB_ETH_LENGTH_OF_ADDRESS);
1120
1121                 ixgb_mc_addr_list_update(hw, mta, netdev->mc_count, 0);
1122         }
1123 }
1124
1125 /**
1126  * ixgb_watchdog - Timer Call-back
1127  * @data: pointer to netdev cast into an unsigned long
1128  **/
1129
1130 static void
1131 ixgb_watchdog(unsigned long data)
1132 {
1133         struct ixgb_adapter *adapter = (struct ixgb_adapter *)data;
1134         struct net_device *netdev = adapter->netdev;
1135         struct ixgb_desc_ring *txdr = &adapter->tx_ring;
1136
1137         ixgb_check_for_link(&adapter->hw);
1138
1139         if (ixgb_check_for_bad_link(&adapter->hw)) {
1140                 /* force the reset path */
1141                 netif_stop_queue(netdev);
1142         }
1143
1144         if(adapter->hw.link_up) {
1145                 if(!netif_carrier_ok(netdev)) {
1146                         DPRINTK(LINK, INFO,
1147                                 "NIC Link is Up 10000 Mbps Full Duplex\n");
1148                         adapter->link_speed = 10000;
1149                         adapter->link_duplex = FULL_DUPLEX;
1150                         netif_carrier_on(netdev);
1151                         netif_wake_queue(netdev);
1152                 }
1153         } else {
1154                 if(netif_carrier_ok(netdev)) {
1155                         adapter->link_speed = 0;
1156                         adapter->link_duplex = 0;
1157                         DPRINTK(LINK, INFO, "NIC Link is Down\n");
1158                         netif_carrier_off(netdev);
1159                         netif_stop_queue(netdev);
1160
1161                 }
1162         }
1163
1164         ixgb_update_stats(adapter);
1165
1166         if(!netif_carrier_ok(netdev)) {
1167                 if(IXGB_DESC_UNUSED(txdr) + 1 < txdr->count) {
1168                         /* We've lost link, so the controller stops DMA,
1169                          * but we've got queued Tx work that's never going
1170                          * to get done, so reset controller to flush Tx.
1171                          * (Do the reset outside of interrupt context). */
1172                         schedule_work(&adapter->tx_timeout_task);
1173                 }
1174         }
1175
1176         /* Force detection of hung controller every watchdog period */
1177         adapter->detect_tx_hung = TRUE;
1178
1179         /* generate an interrupt to force clean up of any stragglers */
1180         IXGB_WRITE_REG(&adapter->hw, ICS, IXGB_INT_TXDW);
1181
1182         /* Reset the timer */
1183         mod_timer(&adapter->watchdog_timer, jiffies + 2 * HZ);
1184 }
1185
1186 #define IXGB_TX_FLAGS_CSUM              0x00000001
1187 #define IXGB_TX_FLAGS_VLAN              0x00000002
1188 #define IXGB_TX_FLAGS_TSO               0x00000004
1189
1190 static inline int
1191 ixgb_tso(struct ixgb_adapter *adapter, struct sk_buff *skb)
1192 {
1193 #ifdef NETIF_F_TSO
1194         struct ixgb_context_desc *context_desc;
1195         unsigned int i;
1196         uint8_t ipcss, ipcso, tucss, tucso, hdr_len;
1197         uint16_t ipcse, tucse, mss;
1198         int err;
1199
1200         if(likely(skb_shinfo(skb)->tso_size)) {
1201                 if (skb_header_cloned(skb)) {
1202                         err = pskb_expand_head(skb, 0, 0, GFP_ATOMIC);
1203                         if (err)
1204                                 return err;
1205                 }
1206
1207                 hdr_len = ((skb->h.raw - skb->data) + (skb->h.th->doff << 2));
1208                 mss = skb_shinfo(skb)->tso_size;
1209                 skb->nh.iph->tot_len = 0;
1210                 skb->nh.iph->check = 0;
1211                 skb->h.th->check = ~csum_tcpudp_magic(skb->nh.iph->saddr,
1212                                                       skb->nh.iph->daddr,
1213                                                       0, IPPROTO_TCP, 0);
1214                 ipcss = skb->nh.raw - skb->data;
1215                 ipcso = (void *)&(skb->nh.iph->check) - (void *)skb->data;
1216                 ipcse = skb->h.raw - skb->data - 1;
1217                 tucss = skb->h.raw - skb->data;
1218                 tucso = (void *)&(skb->h.th->check) - (void *)skb->data;
1219                 tucse = 0;
1220
1221                 i = adapter->tx_ring.next_to_use;
1222                 context_desc = IXGB_CONTEXT_DESC(adapter->tx_ring, i);
1223
1224                 context_desc->ipcss = ipcss;
1225                 context_desc->ipcso = ipcso;
1226                 context_desc->ipcse = cpu_to_le16(ipcse);
1227                 context_desc->tucss = tucss;
1228                 context_desc->tucso = tucso;
1229                 context_desc->tucse = cpu_to_le16(tucse);
1230                 context_desc->mss = cpu_to_le16(mss);
1231                 context_desc->hdr_len = hdr_len;
1232                 context_desc->status = 0;
1233                 context_desc->cmd_type_len = cpu_to_le32(
1234                                                   IXGB_CONTEXT_DESC_TYPE
1235                                                 | IXGB_CONTEXT_DESC_CMD_TSE
1236                                                 | IXGB_CONTEXT_DESC_CMD_IP
1237                                                 | IXGB_CONTEXT_DESC_CMD_TCP
1238                                                 | IXGB_CONTEXT_DESC_CMD_IDE
1239                                                 | (skb->len - (hdr_len)));
1240
1241
1242                 if(++i == adapter->tx_ring.count) i = 0;
1243                 adapter->tx_ring.next_to_use = i;
1244
1245                 return 1;
1246         }
1247 #endif
1248
1249         return 0;
1250 }
1251
1252 static inline boolean_t
1253 ixgb_tx_csum(struct ixgb_adapter *adapter, struct sk_buff *skb)
1254 {
1255         struct ixgb_context_desc *context_desc;
1256         unsigned int i;
1257         uint8_t css, cso;
1258
1259         if(likely(skb->ip_summed == CHECKSUM_HW)) {
1260                 css = skb->h.raw - skb->data;
1261                 cso = (skb->h.raw + skb->csum) - skb->data;
1262
1263                 i = adapter->tx_ring.next_to_use;
1264                 context_desc = IXGB_CONTEXT_DESC(adapter->tx_ring, i);
1265
1266                 context_desc->tucss = css;
1267                 context_desc->tucso = cso;
1268                 context_desc->tucse = 0;
1269                 /* zero out any previously existing data in one instruction */
1270                 *(uint32_t *)&(context_desc->ipcss) = 0;
1271                 context_desc->status = 0;
1272                 context_desc->hdr_len = 0;
1273                 context_desc->mss = 0;
1274                 context_desc->cmd_type_len =
1275                         cpu_to_le32(IXGB_CONTEXT_DESC_TYPE
1276                                     | IXGB_TX_DESC_CMD_IDE);
1277
1278                 if(++i == adapter->tx_ring.count) i = 0;
1279                 adapter->tx_ring.next_to_use = i;
1280
1281                 return TRUE;
1282         }
1283
1284         return FALSE;
1285 }
1286
1287 #define IXGB_MAX_TXD_PWR        14
1288 #define IXGB_MAX_DATA_PER_TXD   (1<<IXGB_MAX_TXD_PWR)
1289
1290 static inline int
1291 ixgb_tx_map(struct ixgb_adapter *adapter, struct sk_buff *skb,
1292             unsigned int first)
1293 {
1294         struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
1295         struct ixgb_buffer *buffer_info;
1296         int len = skb->len;
1297         unsigned int offset = 0, size, count = 0, i;
1298         unsigned int mss = skb_shinfo(skb)->tso_size;
1299
1300         unsigned int nr_frags = skb_shinfo(skb)->nr_frags;
1301         unsigned int f;
1302
1303         len -= skb->data_len;
1304
1305         i = tx_ring->next_to_use;
1306
1307         while(len) {
1308                 buffer_info = &tx_ring->buffer_info[i];
1309                 size = min(len, IXGB_MAX_JUMBO_FRAME_SIZE);
1310                 /* Workaround for premature desc write-backs
1311                  * in TSO mode.  Append 4-byte sentinel desc */
1312                 if(unlikely(mss && !nr_frags && size == len && size > 8))
1313                         size -= 4;
1314
1315                 buffer_info->length = size;
1316                 buffer_info->dma =
1317                         pci_map_single(adapter->pdev,
1318                                 skb->data + offset,
1319                                 size,
1320                                 PCI_DMA_TODEVICE);
1321                 buffer_info->time_stamp = jiffies;
1322                 buffer_info->next_to_watch = 0;
1323
1324                 len -= size;
1325                 offset += size;
1326                 count++;
1327                 if(++i == tx_ring->count) i = 0;
1328         }
1329
1330         for(f = 0; f < nr_frags; f++) {
1331                 struct skb_frag_struct *frag;
1332
1333                 frag = &skb_shinfo(skb)->frags[f];
1334                 len = frag->size;
1335                 offset = 0;
1336
1337                 while(len) {
1338                         buffer_info = &tx_ring->buffer_info[i];
1339                         size = min(len, IXGB_MAX_JUMBO_FRAME_SIZE);
1340                         /* Workaround for premature desc write-backs
1341                          * in TSO mode.  Append 4-byte sentinel desc */
1342                         if(unlikely(mss && (f == (nr_frags-1)) && (size == len)
1343                                     && (size > 8)))
1344                                 size -= 4;
1345
1346                         buffer_info->length = size;
1347                         buffer_info->dma =
1348                                 pci_map_page(adapter->pdev,
1349                                         frag->page,
1350                                         frag->page_offset + offset,
1351                                         size,
1352                                         PCI_DMA_TODEVICE);
1353                         buffer_info->time_stamp = jiffies;
1354                         buffer_info->next_to_watch = 0;
1355
1356                         len -= size;
1357                         offset += size;
1358                         count++;
1359                         if(++i == tx_ring->count) i = 0;
1360                 }
1361         }
1362         i = (i == 0) ? tx_ring->count - 1 : i - 1;
1363         tx_ring->buffer_info[i].skb = skb;
1364         tx_ring->buffer_info[first].next_to_watch = i;
1365
1366         return count;
1367 }
1368
1369 static inline void
1370 ixgb_tx_queue(struct ixgb_adapter *adapter, int count, int vlan_id,int tx_flags)
1371 {
1372         struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
1373         struct ixgb_tx_desc *tx_desc = NULL;
1374         struct ixgb_buffer *buffer_info;
1375         uint32_t cmd_type_len = adapter->tx_cmd_type;
1376         uint8_t status = 0;
1377         uint8_t popts = 0;
1378         unsigned int i;
1379
1380         if(tx_flags & IXGB_TX_FLAGS_TSO) {
1381                 cmd_type_len |= IXGB_TX_DESC_CMD_TSE;
1382                 popts |= (IXGB_TX_DESC_POPTS_IXSM | IXGB_TX_DESC_POPTS_TXSM);
1383         }
1384
1385         if(tx_flags & IXGB_TX_FLAGS_CSUM)
1386                 popts |= IXGB_TX_DESC_POPTS_TXSM;
1387
1388         if(tx_flags & IXGB_TX_FLAGS_VLAN) {
1389                 cmd_type_len |= IXGB_TX_DESC_CMD_VLE;
1390         }
1391
1392         i = tx_ring->next_to_use;
1393
1394         while(count--) {
1395                 buffer_info = &tx_ring->buffer_info[i];
1396                 tx_desc = IXGB_TX_DESC(*tx_ring, i);
1397                 tx_desc->buff_addr = cpu_to_le64(buffer_info->dma);
1398                 tx_desc->cmd_type_len =
1399                         cpu_to_le32(cmd_type_len | buffer_info->length);
1400                 tx_desc->status = status;
1401                 tx_desc->popts = popts;
1402                 tx_desc->vlan = cpu_to_le16(vlan_id);
1403
1404                 if(++i == tx_ring->count) i = 0;
1405         }
1406
1407         tx_desc->cmd_type_len |= cpu_to_le32(IXGB_TX_DESC_CMD_EOP
1408                                 | IXGB_TX_DESC_CMD_RS );
1409
1410         /* Force memory writes to complete before letting h/w
1411          * know there are new descriptors to fetch.  (Only
1412          * applicable for weak-ordered memory model archs,
1413          * such as IA-64). */
1414         wmb();
1415
1416         tx_ring->next_to_use = i;
1417         IXGB_WRITE_REG(&adapter->hw, TDT, i);
1418 }
1419
1420 /* Tx Descriptors needed, worst case */
1421 #define TXD_USE_COUNT(S) (((S) >> IXGB_MAX_TXD_PWR) + \
1422                          (((S) & (IXGB_MAX_DATA_PER_TXD - 1)) ? 1 : 0))
1423 #define DESC_NEEDED TXD_USE_COUNT(IXGB_MAX_DATA_PER_TXD) + \
1424         MAX_SKB_FRAGS * TXD_USE_COUNT(PAGE_SIZE) + 1 \
1425         /* one more for TSO workaround */ + 1
1426
1427 static int
1428 ixgb_xmit_frame(struct sk_buff *skb, struct net_device *netdev)
1429 {
1430         struct ixgb_adapter *adapter = netdev_priv(netdev);
1431         unsigned int first;
1432         unsigned int tx_flags = 0;
1433         unsigned long flags;
1434         int vlan_id = 0;
1435         int tso;
1436
1437         if(skb->len <= 0) {
1438                 dev_kfree_skb_any(skb);
1439                 return 0;
1440         }
1441
1442 #ifdef NETIF_F_LLTX
1443         local_irq_save(flags);
1444         if (!spin_trylock(&adapter->tx_lock)) {
1445                 /* Collision - tell upper layer to requeue */
1446                 local_irq_restore(flags);
1447                 return NETDEV_TX_LOCKED;
1448         }
1449 #else
1450         spin_lock_irqsave(&adapter->tx_lock, flags);
1451 #endif
1452
1453         if(unlikely(IXGB_DESC_UNUSED(&adapter->tx_ring) < DESC_NEEDED)) {
1454                 netif_stop_queue(netdev);
1455                 spin_unlock_irqrestore(&adapter->tx_lock, flags);
1456                 return NETDEV_TX_BUSY;
1457         }
1458
1459 #ifndef NETIF_F_LLTX
1460         spin_unlock_irqrestore(&adapter->tx_lock, flags);
1461 #endif
1462
1463         if(adapter->vlgrp && vlan_tx_tag_present(skb)) {
1464                 tx_flags |= IXGB_TX_FLAGS_VLAN;
1465                 vlan_id = vlan_tx_tag_get(skb);
1466         }
1467
1468         first = adapter->tx_ring.next_to_use;
1469
1470         tso = ixgb_tso(adapter, skb);
1471         if (tso < 0) {
1472                 dev_kfree_skb_any(skb);
1473 #ifdef NETIF_F_LLTX
1474                 spin_unlock_irqrestore(&adapter->tx_lock, flags);
1475 #endif
1476                 return NETDEV_TX_OK;
1477         }
1478
1479         if (likely(tso))
1480                 tx_flags |= IXGB_TX_FLAGS_TSO;
1481         else if(ixgb_tx_csum(adapter, skb))
1482                 tx_flags |= IXGB_TX_FLAGS_CSUM;
1483
1484         ixgb_tx_queue(adapter, ixgb_tx_map(adapter, skb, first), vlan_id,
1485                         tx_flags);
1486
1487         netdev->trans_start = jiffies;
1488
1489 #ifdef NETIF_F_LLTX
1490         /* Make sure there is space in the ring for the next send. */
1491         if(unlikely(IXGB_DESC_UNUSED(&adapter->tx_ring) < DESC_NEEDED))
1492                 netif_stop_queue(netdev);
1493
1494         spin_unlock_irqrestore(&adapter->tx_lock, flags);
1495
1496 #endif
1497         return NETDEV_TX_OK;
1498 }
1499
1500 /**
1501  * ixgb_tx_timeout - Respond to a Tx Hang
1502  * @netdev: network interface device structure
1503  **/
1504
1505 static void
1506 ixgb_tx_timeout(struct net_device *netdev)
1507 {
1508         struct ixgb_adapter *adapter = netdev_priv(netdev);
1509
1510         /* Do the reset outside of interrupt context */
1511         schedule_work(&adapter->tx_timeout_task);
1512 }
1513
1514 static void
1515 ixgb_tx_timeout_task(struct net_device *netdev)
1516 {
1517         struct ixgb_adapter *adapter = netdev_priv(netdev);
1518
1519         adapter->tx_timeout_count++;
1520         ixgb_down(adapter, TRUE);
1521         ixgb_up(adapter);
1522 }
1523
1524 /**
1525  * ixgb_get_stats - Get System Network Statistics
1526  * @netdev: network interface device structure
1527  *
1528  * Returns the address of the device statistics structure.
1529  * The statistics are actually updated from the timer callback.
1530  **/
1531
1532 static struct net_device_stats *
1533 ixgb_get_stats(struct net_device *netdev)
1534 {
1535         struct ixgb_adapter *adapter = netdev_priv(netdev);
1536
1537         return &adapter->net_stats;
1538 }
1539
1540 /**
1541  * ixgb_change_mtu - Change the Maximum Transfer Unit
1542  * @netdev: network interface device structure
1543  * @new_mtu: new value for maximum frame size
1544  *
1545  * Returns 0 on success, negative on failure
1546  **/
1547
1548 static int
1549 ixgb_change_mtu(struct net_device *netdev, int new_mtu)
1550 {
1551         struct ixgb_adapter *adapter = netdev_priv(netdev);
1552         int max_frame = new_mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;
1553         int old_max_frame = netdev->mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;
1554
1555
1556         if((max_frame < IXGB_MIN_ENET_FRAME_SIZE_WITHOUT_FCS + ENET_FCS_LENGTH)
1557            || (max_frame > IXGB_MAX_JUMBO_FRAME_SIZE + ENET_FCS_LENGTH)) {
1558                 DPRINTK(PROBE, ERR, "Invalid MTU setting %d\n", new_mtu);
1559                 return -EINVAL;
1560         }
1561
1562         if((max_frame <= IXGB_MAX_ENET_FRAME_SIZE_WITHOUT_FCS + ENET_FCS_LENGTH)
1563            || (max_frame <= IXGB_RXBUFFER_2048)) {
1564                 adapter->rx_buffer_len = IXGB_RXBUFFER_2048;
1565
1566         } else if(max_frame <= IXGB_RXBUFFER_4096) {
1567                 adapter->rx_buffer_len = IXGB_RXBUFFER_4096;
1568
1569         } else if(max_frame <= IXGB_RXBUFFER_8192) {
1570                 adapter->rx_buffer_len = IXGB_RXBUFFER_8192;
1571
1572         } else {
1573                 adapter->rx_buffer_len = IXGB_RXBUFFER_16384;
1574         }
1575
1576         netdev->mtu = new_mtu;
1577
1578         if(old_max_frame != max_frame && netif_running(netdev)) {
1579
1580                 ixgb_down(adapter, TRUE);
1581                 ixgb_up(adapter);
1582         }
1583
1584         return 0;
1585 }
1586
1587 /**
1588  * ixgb_update_stats - Update the board statistics counters.
1589  * @adapter: board private structure
1590  **/
1591
1592 void
1593 ixgb_update_stats(struct ixgb_adapter *adapter)
1594 {
1595         struct net_device *netdev = adapter->netdev;
1596
1597         if((netdev->flags & IFF_PROMISC) || (netdev->flags & IFF_ALLMULTI) ||
1598            (netdev->mc_count > IXGB_MAX_NUM_MULTICAST_ADDRESSES)) {
1599                 u64 multi = IXGB_READ_REG(&adapter->hw, MPRCL);
1600                 u32 bcast_l = IXGB_READ_REG(&adapter->hw, BPRCL);
1601                 u32 bcast_h = IXGB_READ_REG(&adapter->hw, BPRCH);
1602                 u64 bcast = ((u64)bcast_h << 32) | bcast_l;
1603
1604                 multi |= ((u64)IXGB_READ_REG(&adapter->hw, MPRCH) << 32);
1605                 /* fix up multicast stats by removing broadcasts */
1606                 if(multi >= bcast)
1607                         multi -= bcast;
1608
1609                 adapter->stats.mprcl += (multi & 0xFFFFFFFF);
1610                 adapter->stats.mprch += (multi >> 32);
1611                 adapter->stats.bprcl += bcast_l;
1612                 adapter->stats.bprch += bcast_h;
1613         } else {
1614                 adapter->stats.mprcl += IXGB_READ_REG(&adapter->hw, MPRCL);
1615                 adapter->stats.mprch += IXGB_READ_REG(&adapter->hw, MPRCH);
1616                 adapter->stats.bprcl += IXGB_READ_REG(&adapter->hw, BPRCL);
1617                 adapter->stats.bprch += IXGB_READ_REG(&adapter->hw, BPRCH);
1618         }
1619         adapter->stats.tprl += IXGB_READ_REG(&adapter->hw, TPRL);
1620         adapter->stats.tprh += IXGB_READ_REG(&adapter->hw, TPRH);
1621         adapter->stats.gprcl += IXGB_READ_REG(&adapter->hw, GPRCL);
1622         adapter->stats.gprch += IXGB_READ_REG(&adapter->hw, GPRCH);
1623         adapter->stats.uprcl += IXGB_READ_REG(&adapter->hw, UPRCL);
1624         adapter->stats.uprch += IXGB_READ_REG(&adapter->hw, UPRCH);
1625         adapter->stats.vprcl += IXGB_READ_REG(&adapter->hw, VPRCL);
1626         adapter->stats.vprch += IXGB_READ_REG(&adapter->hw, VPRCH);
1627         adapter->stats.jprcl += IXGB_READ_REG(&adapter->hw, JPRCL);
1628         adapter->stats.jprch += IXGB_READ_REG(&adapter->hw, JPRCH);
1629         adapter->stats.gorcl += IXGB_READ_REG(&adapter->hw, GORCL);
1630         adapter->stats.gorch += IXGB_READ_REG(&adapter->hw, GORCH);
1631         adapter->stats.torl += IXGB_READ_REG(&adapter->hw, TORL);
1632         adapter->stats.torh += IXGB_READ_REG(&adapter->hw, TORH);
1633         adapter->stats.rnbc += IXGB_READ_REG(&adapter->hw, RNBC);
1634         adapter->stats.ruc += IXGB_READ_REG(&adapter->hw, RUC);
1635         adapter->stats.roc += IXGB_READ_REG(&adapter->hw, ROC);
1636         adapter->stats.rlec += IXGB_READ_REG(&adapter->hw, RLEC);
1637         adapter->stats.crcerrs += IXGB_READ_REG(&adapter->hw, CRCERRS);
1638         adapter->stats.icbc += IXGB_READ_REG(&adapter->hw, ICBC);
1639         adapter->stats.ecbc += IXGB_READ_REG(&adapter->hw, ECBC);
1640         adapter->stats.mpc += IXGB_READ_REG(&adapter->hw, MPC);
1641         adapter->stats.tptl += IXGB_READ_REG(&adapter->hw, TPTL);
1642         adapter->stats.tpth += IXGB_READ_REG(&adapter->hw, TPTH);
1643         adapter->stats.gptcl += IXGB_READ_REG(&adapter->hw, GPTCL);
1644         adapter->stats.gptch += IXGB_READ_REG(&adapter->hw, GPTCH);
1645         adapter->stats.bptcl += IXGB_READ_REG(&adapter->hw, BPTCL);
1646         adapter->stats.bptch += IXGB_READ_REG(&adapter->hw, BPTCH);
1647         adapter->stats.mptcl += IXGB_READ_REG(&adapter->hw, MPTCL);
1648         adapter->stats.mptch += IXGB_READ_REG(&adapter->hw, MPTCH);
1649         adapter->stats.uptcl += IXGB_READ_REG(&adapter->hw, UPTCL);
1650         adapter->stats.uptch += IXGB_READ_REG(&adapter->hw, UPTCH);
1651         adapter->stats.vptcl += IXGB_READ_REG(&adapter->hw, VPTCL);
1652         adapter->stats.vptch += IXGB_READ_REG(&adapter->hw, VPTCH);
1653         adapter->stats.jptcl += IXGB_READ_REG(&adapter->hw, JPTCL);
1654         adapter->stats.jptch += IXGB_READ_REG(&adapter->hw, JPTCH);
1655         adapter->stats.gotcl += IXGB_READ_REG(&adapter->hw, GOTCL);
1656         adapter->stats.gotch += IXGB_READ_REG(&adapter->hw, GOTCH);
1657         adapter->stats.totl += IXGB_READ_REG(&adapter->hw, TOTL);
1658         adapter->stats.toth += IXGB_READ_REG(&adapter->hw, TOTH);
1659         adapter->stats.dc += IXGB_READ_REG(&adapter->hw, DC);
1660         adapter->stats.plt64c += IXGB_READ_REG(&adapter->hw, PLT64C);
1661         adapter->stats.tsctc += IXGB_READ_REG(&adapter->hw, TSCTC);
1662         adapter->stats.tsctfc += IXGB_READ_REG(&adapter->hw, TSCTFC);
1663         adapter->stats.ibic += IXGB_READ_REG(&adapter->hw, IBIC);
1664         adapter->stats.rfc += IXGB_READ_REG(&adapter->hw, RFC);
1665         adapter->stats.lfc += IXGB_READ_REG(&adapter->hw, LFC);
1666         adapter->stats.pfrc += IXGB_READ_REG(&adapter->hw, PFRC);
1667         adapter->stats.pftc += IXGB_READ_REG(&adapter->hw, PFTC);
1668         adapter->stats.mcfrc += IXGB_READ_REG(&adapter->hw, MCFRC);
1669         adapter->stats.mcftc += IXGB_READ_REG(&adapter->hw, MCFTC);
1670         adapter->stats.xonrxc += IXGB_READ_REG(&adapter->hw, XONRXC);
1671         adapter->stats.xontxc += IXGB_READ_REG(&adapter->hw, XONTXC);
1672         adapter->stats.xoffrxc += IXGB_READ_REG(&adapter->hw, XOFFRXC);
1673         adapter->stats.xofftxc += IXGB_READ_REG(&adapter->hw, XOFFTXC);
1674         adapter->stats.rjc += IXGB_READ_REG(&adapter->hw, RJC);
1675
1676         /* Fill out the OS statistics structure */
1677
1678         adapter->net_stats.rx_packets = adapter->stats.gprcl;
1679         adapter->net_stats.tx_packets = adapter->stats.gptcl;
1680         adapter->net_stats.rx_bytes = adapter->stats.gorcl;
1681         adapter->net_stats.tx_bytes = adapter->stats.gotcl;
1682         adapter->net_stats.multicast = adapter->stats.mprcl;
1683         adapter->net_stats.collisions = 0;
1684
1685         /* ignore RLEC as it reports errors for padded (<64bytes) frames
1686          * with a length in the type/len field */
1687         adapter->net_stats.rx_errors =
1688             /* adapter->stats.rnbc + */ adapter->stats.crcerrs +
1689             adapter->stats.ruc +
1690             adapter->stats.roc /*+ adapter->stats.rlec */  +
1691             adapter->stats.icbc +
1692             adapter->stats.ecbc + adapter->stats.mpc;
1693
1694         /* see above
1695          * adapter->net_stats.rx_length_errors = adapter->stats.rlec;
1696          */
1697
1698         adapter->net_stats.rx_crc_errors = adapter->stats.crcerrs;
1699         adapter->net_stats.rx_fifo_errors = adapter->stats.mpc;
1700         adapter->net_stats.rx_missed_errors = adapter->stats.mpc;
1701         adapter->net_stats.rx_over_errors = adapter->stats.mpc;
1702
1703         adapter->net_stats.tx_errors = 0;
1704         adapter->net_stats.rx_frame_errors = 0;
1705         adapter->net_stats.tx_aborted_errors = 0;
1706         adapter->net_stats.tx_carrier_errors = 0;
1707         adapter->net_stats.tx_fifo_errors = 0;
1708         adapter->net_stats.tx_heartbeat_errors = 0;
1709         adapter->net_stats.tx_window_errors = 0;
1710 }
1711
1712 #define IXGB_MAX_INTR 10
1713 /**
1714  * ixgb_intr - Interrupt Handler
1715  * @irq: interrupt number
1716  * @data: pointer to a network interface device structure
1717  * @pt_regs: CPU registers structure
1718  **/
1719
1720 static irqreturn_t
1721 ixgb_intr(int irq, void *data, struct pt_regs *regs)
1722 {
1723         struct net_device *netdev = data;
1724         struct ixgb_adapter *adapter = netdev_priv(netdev);
1725         struct ixgb_hw *hw = &adapter->hw;
1726         uint32_t icr = IXGB_READ_REG(hw, ICR);
1727 #ifndef CONFIG_IXGB_NAPI
1728         unsigned int i;
1729 #endif
1730
1731         if(unlikely(!icr))
1732                 return IRQ_NONE;  /* Not our interrupt */
1733
1734         if(unlikely(icr & (IXGB_INT_RXSEQ | IXGB_INT_LSC))) {
1735                 mod_timer(&adapter->watchdog_timer, jiffies);
1736         }
1737
1738 #ifdef CONFIG_IXGB_NAPI
1739         if(netif_rx_schedule_prep(netdev)) {
1740
1741                 /* Disable interrupts and register for poll. The flush
1742                   of the posted write is intentionally left out.
1743                 */
1744
1745                 atomic_inc(&adapter->irq_sem);
1746                 IXGB_WRITE_REG(&adapter->hw, IMC, ~0);
1747                 __netif_rx_schedule(netdev);
1748         }
1749 #else
1750         /* yes, that is actually a & and it is meant to make sure that
1751          * every pass through this for loop checks both receive and
1752          * transmit queues for completed descriptors, intended to
1753          * avoid starvation issues and assist tx/rx fairness. */
1754         for(i = 0; i < IXGB_MAX_INTR; i++)
1755                 if(!ixgb_clean_rx_irq(adapter) &
1756                    !ixgb_clean_tx_irq(adapter))
1757                         break;
1758 #endif
1759         return IRQ_HANDLED;
1760 }
1761
1762 #ifdef CONFIG_IXGB_NAPI
1763 /**
1764  * ixgb_clean - NAPI Rx polling callback
1765  * @adapter: board private structure
1766  **/
1767
1768 static int
1769 ixgb_clean(struct net_device *netdev, int *budget)
1770 {
1771         struct ixgb_adapter *adapter = netdev_priv(netdev);
1772         int work_to_do = min(*budget, netdev->quota);
1773         int tx_cleaned;
1774         int work_done = 0;
1775
1776         tx_cleaned = ixgb_clean_tx_irq(adapter);
1777         ixgb_clean_rx_irq(adapter, &work_done, work_to_do);
1778
1779         *budget -= work_done;
1780         netdev->quota -= work_done;
1781
1782         /* if no Tx and not enough Rx work done, exit the polling mode */
1783         if((!tx_cleaned && (work_done == 0)) || !netif_running(netdev)) {
1784                 netif_rx_complete(netdev);
1785                 ixgb_irq_enable(adapter);
1786                 return 0;
1787         }
1788
1789         return 1;
1790 }
1791 #endif
1792
1793 /**
1794  * ixgb_clean_tx_irq - Reclaim resources after transmit completes
1795  * @adapter: board private structure
1796  **/
1797
1798 static boolean_t
1799 ixgb_clean_tx_irq(struct ixgb_adapter *adapter)
1800 {
1801         struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
1802         struct net_device *netdev = adapter->netdev;
1803         struct ixgb_tx_desc *tx_desc, *eop_desc;
1804         struct ixgb_buffer *buffer_info;
1805         unsigned int i, eop;
1806         boolean_t cleaned = FALSE;
1807
1808         i = tx_ring->next_to_clean;
1809         eop = tx_ring->buffer_info[i].next_to_watch;
1810         eop_desc = IXGB_TX_DESC(*tx_ring, eop);
1811
1812         while(eop_desc->status & IXGB_TX_DESC_STATUS_DD) {
1813
1814                 for(cleaned = FALSE; !cleaned; ) {
1815                         tx_desc = IXGB_TX_DESC(*tx_ring, i);
1816                         buffer_info = &tx_ring->buffer_info[i];
1817
1818                         if (tx_desc->popts
1819                             & (IXGB_TX_DESC_POPTS_TXSM |
1820                                IXGB_TX_DESC_POPTS_IXSM))
1821                                 adapter->hw_csum_tx_good++;
1822
1823                         ixgb_unmap_and_free_tx_resource(adapter, buffer_info);
1824
1825                         *(uint32_t *)&(tx_desc->status) = 0;
1826
1827                         cleaned = (i == eop);
1828                         if(++i == tx_ring->count) i = 0;
1829                 }
1830
1831                 eop = tx_ring->buffer_info[i].next_to_watch;
1832                 eop_desc = IXGB_TX_DESC(*tx_ring, eop);
1833         }
1834
1835         tx_ring->next_to_clean = i;
1836
1837         spin_lock(&adapter->tx_lock);
1838         if(cleaned && netif_queue_stopped(netdev) && netif_carrier_ok(netdev) &&
1839            (IXGB_DESC_UNUSED(tx_ring) > IXGB_TX_QUEUE_WAKE)) {
1840
1841                 netif_wake_queue(netdev);
1842         }
1843         spin_unlock(&adapter->tx_lock);
1844
1845         if(adapter->detect_tx_hung) {
1846                 /* detect a transmit hang in hardware, this serializes the
1847                  * check with the clearing of time_stamp and movement of i */
1848                 adapter->detect_tx_hung = FALSE;
1849                 if (tx_ring->buffer_info[eop].dma &&
1850                    time_after(jiffies, tx_ring->buffer_info[eop].time_stamp + HZ)
1851                    && !(IXGB_READ_REG(&adapter->hw, STATUS) &
1852                         IXGB_STATUS_TXOFF)) {
1853                         /* detected Tx unit hang */
1854                         DPRINTK(DRV, ERR, "Detected Tx Unit Hang\n"
1855                                         "  TDH                  <%x>\n"
1856                                         "  TDT                  <%x>\n"
1857                                         "  next_to_use          <%x>\n"
1858                                         "  next_to_clean        <%x>\n"
1859                                         "buffer_info[next_to_clean]\n"
1860                                         "  time_stamp           <%lx>\n"
1861                                         "  next_to_watch        <%x>\n"
1862                                         "  jiffies              <%lx>\n"
1863                                         "  next_to_watch.status <%x>\n",
1864                                 IXGB_READ_REG(&adapter->hw, TDH),
1865                                 IXGB_READ_REG(&adapter->hw, TDT),
1866                                 tx_ring->next_to_use,
1867                                 tx_ring->next_to_clean,
1868                                 tx_ring->buffer_info[eop].time_stamp,
1869                                 eop,
1870                                 jiffies,
1871                                 eop_desc->status);
1872                         netif_stop_queue(netdev);
1873                 }
1874         }
1875
1876         return cleaned;
1877 }
1878
1879 /**
1880  * ixgb_rx_checksum - Receive Checksum Offload for 82597.
1881  * @adapter: board private structure
1882  * @rx_desc: receive descriptor
1883  * @sk_buff: socket buffer with received data
1884  **/
1885
1886 static inline void
1887 ixgb_rx_checksum(struct ixgb_adapter *adapter,
1888                  struct ixgb_rx_desc *rx_desc,
1889                  struct sk_buff *skb)
1890 {
1891         /* Ignore Checksum bit is set OR
1892          * TCP Checksum has not been calculated
1893          */
1894         if((rx_desc->status & IXGB_RX_DESC_STATUS_IXSM) ||
1895            (!(rx_desc->status & IXGB_RX_DESC_STATUS_TCPCS))) {
1896                 skb->ip_summed = CHECKSUM_NONE;
1897                 return;
1898         }
1899
1900         /* At this point we know the hardware did the TCP checksum */
1901         /* now look at the TCP checksum error bit */
1902         if(rx_desc->errors & IXGB_RX_DESC_ERRORS_TCPE) {
1903                 /* let the stack verify checksum errors */
1904                 skb->ip_summed = CHECKSUM_NONE;
1905                 adapter->hw_csum_rx_error++;
1906         } else {
1907                 /* TCP checksum is good */
1908                 skb->ip_summed = CHECKSUM_UNNECESSARY;
1909                 adapter->hw_csum_rx_good++;
1910         }
1911 }
1912
1913 /**
1914  * ixgb_clean_rx_irq - Send received data up the network stack,
1915  * @adapter: board private structure
1916  **/
1917
1918 static boolean_t
1919 #ifdef CONFIG_IXGB_NAPI
1920 ixgb_clean_rx_irq(struct ixgb_adapter *adapter, int *work_done, int work_to_do)
1921 #else
1922 ixgb_clean_rx_irq(struct ixgb_adapter *adapter)
1923 #endif
1924 {
1925         struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
1926         struct net_device *netdev = adapter->netdev;
1927         struct pci_dev *pdev = adapter->pdev;
1928         struct ixgb_rx_desc *rx_desc, *next_rxd;
1929         struct ixgb_buffer *buffer_info, *next_buffer, *next2_buffer;
1930         uint32_t length;
1931         unsigned int i, j;
1932         boolean_t cleaned = FALSE;
1933
1934         i = rx_ring->next_to_clean;
1935         rx_desc = IXGB_RX_DESC(*rx_ring, i);
1936         buffer_info = &rx_ring->buffer_info[i];
1937
1938         while(rx_desc->status & IXGB_RX_DESC_STATUS_DD) {
1939                 struct sk_buff *skb, *next_skb;
1940                 u8 status;
1941
1942 #ifdef CONFIG_IXGB_NAPI
1943                 if(*work_done >= work_to_do)
1944                         break;
1945
1946                 (*work_done)++;
1947 #endif
1948                 status = rx_desc->status;
1949                 skb = buffer_info->skb;
1950                 buffer_info->skb = NULL;
1951
1952                 prefetch(skb->data);
1953
1954                 if(++i == rx_ring->count) i = 0;
1955                 next_rxd = IXGB_RX_DESC(*rx_ring, i);
1956                 prefetch(next_rxd);
1957
1958                 if((j = i + 1) == rx_ring->count) j = 0;
1959                 next2_buffer = &rx_ring->buffer_info[j];
1960                 prefetch(next2_buffer);
1961
1962                 next_buffer = &rx_ring->buffer_info[i];
1963                 next_skb = next_buffer->skb;
1964                 prefetch(next_skb);
1965
1966                 cleaned = TRUE;
1967
1968                 pci_unmap_single(pdev,
1969                                  buffer_info->dma,
1970                                  buffer_info->length,
1971                                  PCI_DMA_FROMDEVICE);
1972
1973                 length = le16_to_cpu(rx_desc->length);
1974
1975                 if(unlikely(!(status & IXGB_RX_DESC_STATUS_EOP))) {
1976
1977                         /* All receives must fit into a single buffer */
1978
1979                         IXGB_DBG("Receive packet consumed multiple buffers "
1980                                          "length<%x>\n", length);
1981
1982                         dev_kfree_skb_irq(skb);
1983                         goto rxdesc_done;
1984                 }
1985
1986                 if (unlikely(rx_desc->errors
1987                              & (IXGB_RX_DESC_ERRORS_CE | IXGB_RX_DESC_ERRORS_SE
1988                                 | IXGB_RX_DESC_ERRORS_P |
1989                                 IXGB_RX_DESC_ERRORS_RXE))) {
1990
1991                         dev_kfree_skb_irq(skb);
1992                         goto rxdesc_done;
1993                 }
1994
1995                 /* code added for copybreak, this should improve
1996                  * performance for small packets with large amounts
1997                  * of reassembly being done in the stack */
1998 #define IXGB_CB_LENGTH 256
1999                 if (length < IXGB_CB_LENGTH) {
2000                         struct sk_buff *new_skb =
2001                             dev_alloc_skb(length + NET_IP_ALIGN);
2002                         if (new_skb) {
2003                                 skb_reserve(new_skb, NET_IP_ALIGN);
2004                                 new_skb->dev = netdev;
2005                                 memcpy(new_skb->data - NET_IP_ALIGN,
2006                                        skb->data - NET_IP_ALIGN,
2007                                        length + NET_IP_ALIGN);
2008                                 /* save the skb in buffer_info as good */
2009                                 buffer_info->skb = skb;
2010                                 skb = new_skb;
2011                         }
2012                 }
2013                 /* end copybreak code */
2014
2015                 /* Good Receive */
2016                 skb_put(skb, length);
2017
2018                 /* Receive Checksum Offload */
2019                 ixgb_rx_checksum(adapter, rx_desc, skb);
2020
2021                 skb->protocol = eth_type_trans(skb, netdev);
2022 #ifdef CONFIG_IXGB_NAPI
2023                 if(adapter->vlgrp && (status & IXGB_RX_DESC_STATUS_VP)) {
2024                         vlan_hwaccel_receive_skb(skb, adapter->vlgrp,
2025                                 le16_to_cpu(rx_desc->special) &
2026                                         IXGB_RX_DESC_SPECIAL_VLAN_MASK);
2027                 } else {
2028                         netif_receive_skb(skb);
2029                 }
2030 #else /* CONFIG_IXGB_NAPI */
2031                 if(adapter->vlgrp && (status & IXGB_RX_DESC_STATUS_VP)) {
2032                         vlan_hwaccel_rx(skb, adapter->vlgrp,
2033                                 le16_to_cpu(rx_desc->special) &
2034                                         IXGB_RX_DESC_SPECIAL_VLAN_MASK);
2035                 } else {
2036                         netif_rx(skb);
2037                 }
2038 #endif /* CONFIG_IXGB_NAPI */
2039                 netdev->last_rx = jiffies;
2040
2041 rxdesc_done:
2042                 /* clean up descriptor, might be written over by hw */
2043                 rx_desc->status = 0;
2044
2045                 /* use prefetched values */
2046                 rx_desc = next_rxd;
2047                 buffer_info = next_buffer;
2048         }
2049
2050         rx_ring->next_to_clean = i;
2051
2052         ixgb_alloc_rx_buffers(adapter);
2053
2054         return cleaned;
2055 }
2056
2057 /**
2058  * ixgb_alloc_rx_buffers - Replace used receive buffers
2059  * @adapter: address of board private structure
2060  **/
2061
2062 static void
2063 ixgb_alloc_rx_buffers(struct ixgb_adapter *adapter)
2064 {
2065         struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
2066         struct net_device *netdev = adapter->netdev;
2067         struct pci_dev *pdev = adapter->pdev;
2068         struct ixgb_rx_desc *rx_desc;
2069         struct ixgb_buffer *buffer_info;
2070         struct sk_buff *skb;
2071         unsigned int i;
2072         int num_group_tail_writes;
2073         long cleancount;
2074
2075         i = rx_ring->next_to_use;
2076         buffer_info = &rx_ring->buffer_info[i];
2077         cleancount = IXGB_DESC_UNUSED(rx_ring);
2078
2079         num_group_tail_writes = IXGB_RX_BUFFER_WRITE;
2080
2081         /* leave three descriptors unused */
2082         while(--cleancount > 2) {
2083                 /* recycle! its good for you */
2084                 if (!(skb = buffer_info->skb))
2085                         skb = dev_alloc_skb(adapter->rx_buffer_len
2086                                             + NET_IP_ALIGN);
2087                 else {
2088                         skb_trim(skb, 0);
2089                         goto map_skb;
2090                 }
2091
2092                 if (unlikely(!skb)) {
2093                         /* Better luck next round */
2094                         adapter->alloc_rx_buff_failed++;
2095                         break;
2096                 }
2097
2098                 /* Make buffer alignment 2 beyond a 16 byte boundary
2099                  * this will result in a 16 byte aligned IP header after
2100                  * the 14 byte MAC header is removed
2101                  */
2102                 skb_reserve(skb, NET_IP_ALIGN);
2103
2104                 skb->dev = netdev;
2105
2106                 buffer_info->skb = skb;
2107                 buffer_info->length = adapter->rx_buffer_len;
2108 map_skb:
2109                 buffer_info->dma = pci_map_single(pdev,
2110                                                   skb->data,
2111                                                   adapter->rx_buffer_len,
2112                                                   PCI_DMA_FROMDEVICE);
2113
2114                 rx_desc = IXGB_RX_DESC(*rx_ring, i);
2115                 rx_desc->buff_addr = cpu_to_le64(buffer_info->dma);
2116                 /* guarantee DD bit not set now before h/w gets descriptor
2117                  * this is the rest of the workaround for h/w double
2118                  * writeback. */
2119                 rx_desc->status = 0;
2120
2121
2122                 if(++i == rx_ring->count) i = 0;
2123                 buffer_info = &rx_ring->buffer_info[i];
2124         }
2125
2126         if (likely(rx_ring->next_to_use != i)) {
2127                 rx_ring->next_to_use = i;
2128                 if (unlikely(i-- == 0))
2129                         i = (rx_ring->count - 1);
2130
2131                 /* Force memory writes to complete before letting h/w
2132                  * know there are new descriptors to fetch.  (Only
2133                  * applicable for weak-ordered memory model archs, such
2134                  * as IA-64). */
2135                 wmb();
2136                 IXGB_WRITE_REG(&adapter->hw, RDT, i);
2137         }
2138 }
2139
2140 /**
2141  * ixgb_vlan_rx_register - enables or disables vlan tagging/stripping.
2142  *
2143  * @param netdev network interface device structure
2144  * @param grp indicates to enable or disable tagging/stripping
2145  **/
2146 static void
2147 ixgb_vlan_rx_register(struct net_device *netdev, struct vlan_group *grp)
2148 {
2149         struct ixgb_adapter *adapter = netdev_priv(netdev);
2150         uint32_t ctrl, rctl;
2151
2152         ixgb_irq_disable(adapter);
2153         adapter->vlgrp = grp;
2154
2155         if(grp) {
2156                 /* enable VLAN tag insert/strip */
2157                 ctrl = IXGB_READ_REG(&adapter->hw, CTRL0);
2158                 ctrl |= IXGB_CTRL0_VME;
2159                 IXGB_WRITE_REG(&adapter->hw, CTRL0, ctrl);
2160
2161                 /* enable VLAN receive filtering */
2162
2163                 rctl = IXGB_READ_REG(&adapter->hw, RCTL);
2164                 rctl |= IXGB_RCTL_VFE;
2165                 rctl &= ~IXGB_RCTL_CFIEN;
2166                 IXGB_WRITE_REG(&adapter->hw, RCTL, rctl);
2167         } else {
2168                 /* disable VLAN tag insert/strip */
2169
2170                 ctrl = IXGB_READ_REG(&adapter->hw, CTRL0);
2171                 ctrl &= ~IXGB_CTRL0_VME;
2172                 IXGB_WRITE_REG(&adapter->hw, CTRL0, ctrl);
2173
2174                 /* disable VLAN filtering */
2175
2176                 rctl = IXGB_READ_REG(&adapter->hw, RCTL);
2177                 rctl &= ~IXGB_RCTL_VFE;
2178                 IXGB_WRITE_REG(&adapter->hw, RCTL, rctl);
2179         }
2180
2181         ixgb_irq_enable(adapter);
2182 }
2183
2184 static void
2185 ixgb_vlan_rx_add_vid(struct net_device *netdev, uint16_t vid)
2186 {
2187         struct ixgb_adapter *adapter = netdev_priv(netdev);
2188         uint32_t vfta, index;
2189
2190         /* add VID to filter table */
2191
2192         index = (vid >> 5) & 0x7F;
2193         vfta = IXGB_READ_REG_ARRAY(&adapter->hw, VFTA, index);
2194         vfta |= (1 << (vid & 0x1F));
2195         ixgb_write_vfta(&adapter->hw, index, vfta);
2196 }
2197
2198 static void
2199 ixgb_vlan_rx_kill_vid(struct net_device *netdev, uint16_t vid)
2200 {
2201         struct ixgb_adapter *adapter = netdev_priv(netdev);
2202         uint32_t vfta, index;
2203
2204         ixgb_irq_disable(adapter);
2205
2206         if(adapter->vlgrp)
2207                 adapter->vlgrp->vlan_devices[vid] = NULL;
2208
2209         ixgb_irq_enable(adapter);
2210
2211         /* remove VID from filter table*/
2212
2213         index = (vid >> 5) & 0x7F;
2214         vfta = IXGB_READ_REG_ARRAY(&adapter->hw, VFTA, index);
2215         vfta &= ~(1 << (vid & 0x1F));
2216         ixgb_write_vfta(&adapter->hw, index, vfta);
2217 }
2218
2219 static void
2220 ixgb_restore_vlan(struct ixgb_adapter *adapter)
2221 {
2222         ixgb_vlan_rx_register(adapter->netdev, adapter->vlgrp);
2223
2224         if(adapter->vlgrp) {
2225                 uint16_t vid;
2226                 for(vid = 0; vid < VLAN_GROUP_ARRAY_LEN; vid++) {
2227                         if(!adapter->vlgrp->vlan_devices[vid])
2228                                 continue;
2229                         ixgb_vlan_rx_add_vid(adapter->netdev, vid);
2230                 }
2231         }
2232 }
2233
2234 #ifdef CONFIG_NET_POLL_CONTROLLER
2235 /*
2236  * Polling 'interrupt' - used by things like netconsole to send skbs
2237  * without having to re-enable interrupts. It's not called while
2238  * the interrupt routine is executing.
2239  */
2240
2241 static void ixgb_netpoll(struct net_device *dev)
2242 {
2243         struct ixgb_adapter *adapter = dev->priv;
2244
2245         disable_irq(adapter->pdev->irq);
2246         ixgb_intr(adapter->pdev->irq, dev, NULL);
2247         enable_irq(adapter->pdev->irq);
2248 }
2249 #endif
2250
2251 /* ixgb_main.c */