drivers/net/e1000/e1000_main.c

   1 /*******************************************************************************
   2
   3   Intel PRO/1000 Linux driver
   4   Copyright(c) 1999 - 2006 Intel Corporation.
   5
   6   This program is free software; you can redistribute it and/or modify it
   7   under the terms and conditions of the GNU General Public License,
   8   version 2, as published by the Free Software Foundation.
   9
  10   This program is distributed in the hope it will be useful, but WITHOUT
  11   ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  12   FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  13   more details.
  14
  15   You should have received a copy of the GNU General Public License along with
  16   this program; if not, write to the Free Software Foundation, Inc.,
  17   51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
  18
  19   The full GNU General Public License is included in this distribution in
  20   the file called "COPYING".
  21
  22   Contact Information:
  23   Linux NICS <linux.nics@intel.com>
  24   e1000-devel Mailing List <e1000-devel@lists.sourceforge.net>
  25   Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
  26
  27 *******************************************************************************/
  28
  29 #include "e1000.h"
  30 #include <net/ip6_checksum.h>
  31
  32 char e1000_driver_name[] = "e1000";
  33 static char e1000_driver_string[] = "Intel(R) PRO/1000 Network Driver";
  34 #define DRV_VERSION "7.3.21-k6-NAPI"
  35 const char e1000_driver_version[] = DRV_VERSION;
  36 static const char e1000_copyright[] = "Copyright (c) 1999-2006 Intel Corporation.";
  37
  38 /* e1000_pci_tbl - PCI Device ID Table
  39  *
  40  * Last entry must be all 0s
  41  *
  42  * Macro expands to...
  43  *   {PCI_DEVICE(PCI_VENDOR_ID_INTEL, device_id)}
  44  */
  45 static DEFINE_PCI_DEVICE_TABLE(e1000_pci_tbl) = {
  46         INTEL_E1000_ETHERNET_DEVICE(0x1000),
  47         INTEL_E1000_ETHERNET_DEVICE(0x1001),
  48         INTEL_E1000_ETHERNET_DEVICE(0x1004),
  49         INTEL_E1000_ETHERNET_DEVICE(0x1008),
  50         INTEL_E1000_ETHERNET_DEVICE(0x1009),
  51         INTEL_E1000_ETHERNET_DEVICE(0x100C),
  52         INTEL_E1000_ETHERNET_DEVICE(0x100D),
  53         INTEL_E1000_ETHERNET_DEVICE(0x100E),
  54         INTEL_E1000_ETHERNET_DEVICE(0x100F),
  55         INTEL_E1000_ETHERNET_DEVICE(0x1010),
  56         INTEL_E1000_ETHERNET_DEVICE(0x1011),
  57         INTEL_E1000_ETHERNET_DEVICE(0x1012),
  58         INTEL_E1000_ETHERNET_DEVICE(0x1013),
  59         INTEL_E1000_ETHERNET_DEVICE(0x1014),
  60         INTEL_E1000_ETHERNET_DEVICE(0x1015),
  61         INTEL_E1000_ETHERNET_DEVICE(0x1016),
  62         INTEL_E1000_ETHERNET_DEVICE(0x1017),
  63         INTEL_E1000_ETHERNET_DEVICE(0x1018),
  64         INTEL_E1000_ETHERNET_DEVICE(0x1019),
  65         INTEL_E1000_ETHERNET_DEVICE(0x101A),
  66         INTEL_E1000_ETHERNET_DEVICE(0x101D),
  67         INTEL_E1000_ETHERNET_DEVICE(0x101E),
  68         INTEL_E1000_ETHERNET_DEVICE(0x1026),
  69         INTEL_E1000_ETHERNET_DEVICE(0x1027),
  70         INTEL_E1000_ETHERNET_DEVICE(0x1028),
  71         INTEL_E1000_ETHERNET_DEVICE(0x1075),
  72         INTEL_E1000_ETHERNET_DEVICE(0x1076),
  73         INTEL_E1000_ETHERNET_DEVICE(0x1077),
  74         INTEL_E1000_ETHERNET_DEVICE(0x1078),
  75         INTEL_E1000_ETHERNET_DEVICE(0x1079),
  76         INTEL_E1000_ETHERNET_DEVICE(0x107A),
  77         INTEL_E1000_ETHERNET_DEVICE(0x107B),
  78         INTEL_E1000_ETHERNET_DEVICE(0x107C),
  79         INTEL_E1000_ETHERNET_DEVICE(0x108A),
  80         INTEL_E1000_ETHERNET_DEVICE(0x1099),
  81         INTEL_E1000_ETHERNET_DEVICE(0x10B5),
  82         /* required last entry */
  83         {0,}
  84 };
  85
  86 MODULE_DEVICE_TABLE(pci, e1000_pci_tbl);
  87
  88 int e1000_up(struct e1000_adapter *adapter);
  89 void e1000_down(struct e1000_adapter *adapter);
  90 void e1000_reinit_locked(struct e1000_adapter *adapter);
  91 void e1000_reset(struct e1000_adapter *adapter);
  92 int e1000_set_spd_dplx(struct e1000_adapter *adapter, u16 spddplx);
  93 int e1000_setup_all_tx_resources(struct e1000_adapter *adapter);
  94 int e1000_setup_all_rx_resources(struct e1000_adapter *adapter);
  95 void e1000_free_all_tx_resources(struct e1000_adapter *adapter);
  96 void e1000_free_all_rx_resources(struct e1000_adapter *adapter);
  97 static int e1000_setup_tx_resources(struct e1000_adapter *adapter,
  98                              struct e1000_tx_ring *txdr);
  99 static int e1000_setup_rx_resources(struct e1000_adapter *adapter,
 100                              struct e1000_rx_ring *rxdr);
 101 static void e1000_free_tx_resources(struct e1000_adapter *adapter,
 102                              struct e1000_tx_ring *tx_ring);
 103 static void e1000_free_rx_resources(struct e1000_adapter *adapter,
 104                              struct e1000_rx_ring *rx_ring);
 105 void e1000_update_stats(struct e1000_adapter *adapter);
 106
 107 static int e1000_init_module(void);
 108 static void e1000_exit_module(void);
 109 static int e1000_probe(struct pci_dev *pdev, const struct pci_device_id *ent);
 110 static void __devexit e1000_remove(struct pci_dev *pdev);
 111 static int e1000_alloc_queues(struct e1000_adapter *adapter);
 112 static int e1000_sw_init(struct e1000_adapter *adapter);
 113 static int e1000_open(struct net_device *netdev);
 114 static int e1000_close(struct net_device *netdev);
 115 static void e1000_configure_tx(struct e1000_adapter *adapter);
 116 static void e1000_configure_rx(struct e1000_adapter *adapter);
 117 static void e1000_setup_rctl(struct e1000_adapter *adapter);
 118 static void e1000_clean_all_tx_rings(struct e1000_adapter *adapter);
 119 static void e1000_clean_all_rx_rings(struct e1000_adapter *adapter);
 120 static void e1000_clean_tx_ring(struct e1000_adapter *adapter,
 121                                 struct e1000_tx_ring *tx_ring);
 122 static void e1000_clean_rx_ring(struct e1000_adapter *adapter,
 123                                 struct e1000_rx_ring *rx_ring);
 124 static void e1000_set_rx_mode(struct net_device *netdev);
 125 static void e1000_update_phy_info(unsigned long data);
 126 static void e1000_watchdog(unsigned long data);
 127 static void e1000_82547_tx_fifo_stall(unsigned long data);
 128 static netdev_tx_t e1000_xmit_frame(struct sk_buff *skb,
 129                                     struct net_device *netdev);
 130 static struct net_device_stats * e1000_get_stats(struct net_device *netdev);
 131 static int e1000_change_mtu(struct net_device *netdev, int new_mtu);
 132 static int e1000_set_mac(struct net_device *netdev, void *p);
 133 static irqreturn_t e1000_intr(int irq, void *data);
 134 static bool e1000_clean_tx_irq(struct e1000_adapter *adapter,
 135                                struct e1000_tx_ring *tx_ring);
 136 static int e1000_clean(struct napi_struct *napi, int budget);
 137 static bool e1000_clean_rx_irq(struct e1000_adapter *adapter,
 138                                struct e1000_rx_ring *rx_ring,
 139                                int *work_done, int work_to_do);
 140 static bool e1000_clean_jumbo_rx_irq(struct e1000_adapter *adapter,
 141                                      struct e1000_rx_ring *rx_ring,
 142                                      int *work_done, int work_to_do);
 143 static void e1000_alloc_rx_buffers(struct e1000_adapter *adapter,
 144                                    struct e1000_rx_ring *rx_ring,
 145                                    int cleaned_count);
 146 static void e1000_alloc_jumbo_rx_buffers(struct e1000_adapter *adapter,
 147                                          struct e1000_rx_ring *rx_ring,
 148                                          int cleaned_count);
 149 static int e1000_ioctl(struct net_device *netdev, struct ifreq *ifr, int cmd);
 150 static int e1000_mii_ioctl(struct net_device *netdev, struct ifreq *ifr,
 151                            int cmd);
 152 static void e1000_enter_82542_rst(struct e1000_adapter *adapter);
 153 static void e1000_leave_82542_rst(struct e1000_adapter *adapter);
 154 static void e1000_tx_timeout(struct net_device *dev);
 155 static void e1000_reset_task(struct work_struct *work);
 156 static void e1000_smartspeed(struct e1000_adapter *adapter);
 157 static int e1000_82547_fifo_workaround(struct e1000_adapter *adapter,
 158                                        struct sk_buff *skb);
 159
 160 static void e1000_vlan_rx_register(struct net_device *netdev, struct vlan_group *grp);
 161 static void e1000_vlan_rx_add_vid(struct net_device *netdev, u16 vid);
 162 static void e1000_vlan_rx_kill_vid(struct net_device *netdev, u16 vid);
 163 static void e1000_restore_vlan(struct e1000_adapter *adapter);
 164
 165 #ifdef CONFIG_PM
 166 static int e1000_suspend(struct pci_dev *pdev, pm_message_t state);
 167 static int e1000_resume(struct pci_dev *pdev);
 168 #endif
 169 static void e1000_shutdown(struct pci_dev *pdev);
 170
 171 #ifdef CONFIG_NET_POLL_CONTROLLER
 172 /* for netdump / net console */
 173 static void e1000_netpoll (struct net_device *netdev);
 174 #endif
 175
 176 #define COPYBREAK_DEFAULT 256
 177 static unsigned int copybreak __read_mostly = COPYBREAK_DEFAULT;
 178 module_param(copybreak, uint, 0644);
 179 MODULE_PARM_DESC(copybreak,
 180         "Maximum size of packet that is copied to a new buffer on receive");
 181
 182 static pci_ers_result_t e1000_io_error_detected(struct pci_dev *pdev,
 183                      pci_channel_state_t state);
 184 static pci_ers_result_t e1000_io_slot_reset(struct pci_dev *pdev);
 185 static void e1000_io_resume(struct pci_dev *pdev);
 186
 187 static struct pci_error_handlers e1000_err_handler = {
 188         .error_detected = e1000_io_error_detected,
 189         .slot_reset = e1000_io_slot_reset,
 190         .resume = e1000_io_resume,
 191 };
 192
 193 static struct pci_driver e1000_driver = {
 194         .name     = e1000_driver_name,
 195         .id_table = e1000_pci_tbl,
 196         .probe    = e1000_probe,
 197         .remove   = __devexit_p(e1000_remove),
 198 #ifdef CONFIG_PM
 199         /* Power Managment Hooks */
 200         .suspend  = e1000_suspend,
 201         .resume   = e1000_resume,
 202 #endif
 203         .shutdown = e1000_shutdown,
 204         .err_handler = &e1000_err_handler
 205 };
 206
 207 MODULE_AUTHOR("Intel Corporation, <linux.nics@intel.com>");
 208 MODULE_DESCRIPTION("Intel(R) PRO/1000 Network Driver");
 209 MODULE_LICENSE("GPL");
 210 MODULE_VERSION(DRV_VERSION);
 211
 212 static int debug = NETIF_MSG_DRV | NETIF_MSG_PROBE;
 213 module_param(debug, int, 0);
 214 MODULE_PARM_DESC(debug, "Debug level (0=none,...,16=all)");
 215
 216 /**
 217  * e1000_get_hw_dev - return device
 218  * used by hardware layer to print debugging information
 219  *
 220  **/
 221 struct net_device *e1000_get_hw_dev(struct e1000_hw *hw)
 222 {
 223         struct e1000_adapter *adapter = hw->back;
 224         return adapter->netdev;
 225 }
 226
 227 /**
 228  * e1000_init_module - Driver Registration Routine
 229  *
 230  * e1000_init_module is the first routine called when the driver is
 231  * loaded. All it does is register with the PCI subsystem.
 232  **/
 233
 234 static int __init e1000_init_module(void)
 235 {
 236         int ret;
 237         pr_info("%s - version %s\n", e1000_driver_string, e1000_driver_version);
 238
 239         pr_info("%s\n", e1000_copyright);
 240
 241         ret = pci_register_driver(&e1000_driver);
 242         if (copybreak != COPYBREAK_DEFAULT) {
 243                 if (copybreak == 0)
 244                         pr_info("copybreak disabled\n");
 245                 else
 246                         pr_info("copybreak enabled for "
 247                                    "packets <= %u bytes\n", copybreak);
 248         }
 249         return ret;
 250 }
 251
 252 module_init(e1000_init_module);
 253
 254 /**
 255  * e1000_exit_module - Driver Exit Cleanup Routine
 256  *
 257  * e1000_exit_module is called just before the driver is removed
 258  * from memory.
 259  **/
 260
 261 static void __exit e1000_exit_module(void)
 262 {
 263         pci_unregister_driver(&e1000_driver);
 264 }
 265
 266 module_exit(e1000_exit_module);
 267
 268 static int e1000_request_irq(struct e1000_adapter *adapter)
 269 {
 270         struct net_device *netdev = adapter->netdev;
 271         irq_handler_t handler = e1000_intr;
 272         int irq_flags = IRQF_SHARED;
 273         int err;
 274
 275         err = request_irq(adapter->pdev->irq, handler, irq_flags, netdev->name,
 276                           netdev);
 277         if (err) {
 278                 e_err(probe, "Unable to allocate interrupt Error: %d\n", err);
 279         }
 280
 281         return err;
 282 }
 283
 284 static void e1000_free_irq(struct e1000_adapter *adapter)
 285 {
 286         struct net_device *netdev = adapter->netdev;
 287
 288         free_irq(adapter->pdev->irq, netdev);
 289 }
 290
 291 /**
 292  * e1000_irq_disable - Mask off interrupt generation on the NIC
 293  * @adapter: board private structure
 294  **/
 295
 296 static void e1000_irq_disable(struct e1000_adapter *adapter)
 297 {
 298         struct e1000_hw *hw = &adapter->hw;
 299
 300         ew32(IMC, ~0);
 301         E1000_WRITE_FLUSH();
 302         synchronize_irq(adapter->pdev->irq);
 303 }
 304
 305 /**
 306  * e1000_irq_enable - Enable default interrupt generation settings
 307  * @adapter: board private structure
 308  **/
 309
 310 static void e1000_irq_enable(struct e1000_adapter *adapter)
 311 {
 312         struct e1000_hw *hw = &adapter->hw;
 313
 314         ew32(IMS, IMS_ENABLE_MASK);
 315         E1000_WRITE_FLUSH();
 316 }
 317
 318 static void e1000_update_mng_vlan(struct e1000_adapter *adapter)
 319 {
 320         struct e1000_hw *hw = &adapter->hw;
 321         struct net_device *netdev = adapter->netdev;
 322         u16 vid = hw->mng_cookie.vlan_id;
 323         u16 old_vid = adapter->mng_vlan_id;
 324         if (adapter->vlgrp) {
 325                 if (!vlan_group_get_device(adapter->vlgrp, vid)) {
 326                         if (hw->mng_cookie.status &
 327                                 E1000_MNG_DHCP_COOKIE_STATUS_VLAN_SUPPORT) {
 328                                 e1000_vlan_rx_add_vid(netdev, vid);
 329                                 adapter->mng_vlan_id = vid;
 330                         } else
 331                                 adapter->mng_vlan_id = E1000_MNG_VLAN_NONE;
 332
 333                         if ((old_vid != (u16)E1000_MNG_VLAN_NONE) &&
 334                                         (vid != old_vid) &&
 335                             !vlan_group_get_device(adapter->vlgrp, old_vid))
 336                                 e1000_vlan_rx_kill_vid(netdev, old_vid);
 337                 } else
 338                         adapter->mng_vlan_id = vid;
 339         }
 340 }
 341
 342 static void e1000_init_manageability(struct e1000_adapter *adapter)
 343 {
 344         struct e1000_hw *hw = &adapter->hw;
 345
 346         if (adapter->en_mng_pt) {
 347                 u32 manc = er32(MANC);
 348
 349                 /* disable hardware interception of ARP */
 350                 manc &= ~(E1000_MANC_ARP_EN);
 351
 352                 ew32(MANC, manc);
 353         }
 354 }
 355
 356 static void e1000_release_manageability(struct e1000_adapter *adapter)
 357 {
 358         struct e1000_hw *hw = &adapter->hw;
 359
 360         if (adapter->en_mng_pt) {
 361                 u32 manc = er32(MANC);
 362
 363                 /* re-enable hardware interception of ARP */
 364                 manc |= E1000_MANC_ARP_EN;
 365
 366                 ew32(MANC, manc);
 367         }
 368 }
 369
 370 /**
 371  * e1000_configure - configure the hardware for RX and TX
 372  * @adapter = private board structure
 373  **/
 374 static void e1000_configure(struct e1000_adapter *adapter)
 375 {
 376         struct net_device *netdev = adapter->netdev;
 377         int i;
 378
 379         e1000_set_rx_mode(netdev);
 380
 381         e1000_restore_vlan(adapter);
 382         e1000_init_manageability(adapter);
 383
 384         e1000_configure_tx(adapter);
 385         e1000_setup_rctl(adapter);
 386         e1000_configure_rx(adapter);
 387         /* call E1000_DESC_UNUSED which always leaves
 388          * at least 1 descriptor unused to make sure
 389          * next_to_use != next_to_clean */
 390         for (i = 0; i < adapter->num_rx_queues; i++) {
 391                 struct e1000_rx_ring *ring = &adapter->rx_ring[i];
 392                 adapter->alloc_rx_buf(adapter, ring,
 393                                       E1000_DESC_UNUSED(ring));
 394         }
 395 }
 396
 397 int e1000_up(struct e1000_adapter *adapter)
 398 {
 399         struct e1000_hw *hw = &adapter->hw;
 400
 401         /* hardware has been reset, we need to reload some things */
 402         e1000_configure(adapter);
 403
 404         clear_bit(__E1000_DOWN, &adapter->flags);
 405
 406         napi_enable(&adapter->napi);
 407
 408         e1000_irq_enable(adapter);
 409
 410         netif_wake_queue(adapter->netdev);
 411
 412         /* fire a link change interrupt to start the watchdog */
 413         ew32(ICS, E1000_ICS_LSC);
 414         return 0;
 415 }
 416
 417 /**
 418  * e1000_power_up_phy - restore link in case the phy was powered down
 419  * @adapter: address of board private structure
 420  *
 421  * The phy may be powered down to save power and turn off link when the
 422  * driver is unloaded and wake on lan is not enabled (among others)
 423  * *** this routine MUST be followed by a call to e1000_reset ***
 424  *
 425  **/
 426
 427 void e1000_power_up_phy(struct e1000_adapter *adapter)
 428 {
 429         struct e1000_hw *hw = &adapter->hw;
 430         u16 mii_reg = 0;
 431
 432         /* Just clear the power down bit to wake the phy back up */
 433         if (hw->media_type == e1000_media_type_copper) {
 434                 /* according to the manual, the phy will retain its
 435                  * settings across a power-down/up cycle */
 436                 e1000_read_phy_reg(hw, PHY_CTRL, &mii_reg);
 437                 mii_reg &= ~MII_CR_POWER_DOWN;
 438                 e1000_write_phy_reg(hw, PHY_CTRL, mii_reg);
 439         }
 440 }
 441
 442 static void e1000_power_down_phy(struct e1000_adapter *adapter)
 443 {
 444         struct e1000_hw *hw = &adapter->hw;
 445
 446         /* Power down the PHY so no link is implied when interface is down *
 447          * The PHY cannot be powered down if any of the following is true *
 448          * (a) WoL is enabled
 449          * (b) AMT is active
 450          * (c) SoL/IDER session is active */
 451         if (!adapter->wol && hw->mac_type >= e1000_82540 &&
 452            hw->media_type == e1000_media_type_copper) {
 453                 u16 mii_reg = 0;
 454
 455                 switch (hw->mac_type) {
 456                 case e1000_82540:
 457                 case e1000_82545:
 458                 case e1000_82545_rev_3:
 459                 case e1000_82546:
 460                 case e1000_82546_rev_3:
 461                 case e1000_82541:
 462                 case e1000_82541_rev_2:
 463                 case e1000_82547:
 464                 case e1000_82547_rev_2:
 465                         if (er32(MANC) & E1000_MANC_SMBUS_EN)
 466                                 goto out;
 467                         break;
 468                 default:
 469                         goto out;
 470                 }
 471                 e1000_read_phy_reg(hw, PHY_CTRL, &mii_reg);
 472                 mii_reg |= MII_CR_POWER_DOWN;
 473                 e1000_write_phy_reg(hw, PHY_CTRL, mii_reg);
 474                 mdelay(1);
 475         }
 476 out:
 477         return;
 478 }
 479
 480 void e1000_down(struct e1000_adapter *adapter)
 481 {
 482         struct e1000_hw *hw = &adapter->hw;
 483         struct net_device *netdev = adapter->netdev;
 484         u32 rctl, tctl;
 485
 486         /* signal that we're down so the interrupt handler does not
 487          * reschedule our watchdog timer */
 488         set_bit(__E1000_DOWN, &adapter->flags);
 489
 490         /* disable receives in the hardware */
 491         rctl = er32(RCTL);
 492         ew32(RCTL, rctl & ~E1000_RCTL_EN);
 493         /* flush and sleep below */
 494
 495         netif_tx_disable(netdev);
 496
 497         /* disable transmits in the hardware */
 498         tctl = er32(TCTL);
 499         tctl &= ~E1000_TCTL_EN;
 500         ew32(TCTL, tctl);
 501         /* flush both disables and wait for them to finish */
 502         E1000_WRITE_FLUSH();
 503         msleep(10);
 504
 505         napi_disable(&adapter->napi);
 506
 507         e1000_irq_disable(adapter);
 508
 509         del_timer_sync(&adapter->tx_fifo_stall_timer);
 510         del_timer_sync(&adapter->watchdog_timer);
 511         del_timer_sync(&adapter->phy_info_timer);
 512
 513         adapter->link_speed = 0;
 514         adapter->link_duplex = 0;
 515         netif_carrier_off(netdev);
 516
 517         e1000_reset(adapter);
 518         e1000_clean_all_tx_rings(adapter);
 519         e1000_clean_all_rx_rings(adapter);
 520 }
 521
 522 void e1000_reinit_locked(struct e1000_adapter *adapter)
 523 {
 524         WARN_ON(in_interrupt());
 525         while (test_and_set_bit(__E1000_RESETTING, &adapter->flags))
 526                 msleep(1);
 527         e1000_down(adapter);
 528         e1000_up(adapter);
 529         clear_bit(__E1000_RESETTING, &adapter->flags);
 530 }
 531
 532 void e1000_reset(struct e1000_adapter *adapter)
 533 {
 534         struct e1000_hw *hw = &adapter->hw;
 535         u32 pba = 0, tx_space, min_tx_space, min_rx_space;
 536         bool legacy_pba_adjust = false;
 537         u16 hwm;
 538
 539         /* Repartition Pba for greater than 9k mtu
 540          * To take effect CTRL.RST is required.
 541          */
 542
 543         switch (hw->mac_type) {
 544         case e1000_82542_rev2_0:
 545         case e1000_82542_rev2_1:
 546         case e1000_82543:
 547         case e1000_82544:
 548         case e1000_82540:
 549         case e1000_82541:
 550         case e1000_82541_rev_2:
 551                 legacy_pba_adjust = true;
 552                 pba = E1000_PBA_48K;
 553                 break;
 554         case e1000_82545:
 555         case e1000_82545_rev_3:
 556         case e1000_82546:
 557         case e1000_82546_rev_3:
 558                 pba = E1000_PBA_48K;
 559                 break;
 560         case e1000_82547:
 561         case e1000_82547_rev_2:
 562                 legacy_pba_adjust = true;
 563                 pba = E1000_PBA_30K;
 564                 break;
 565         case e1000_undefined:
 566         case e1000_num_macs:
 567                 break;
 568         }
 569
 570         if (legacy_pba_adjust) {
 571                 if (hw->max_frame_size > E1000_RXBUFFER_8192)
 572                         pba -= 8; /* allocate more FIFO for Tx */
 573
 574                 if (hw->mac_type == e1000_82547) {
 575                         adapter->tx_fifo_head = 0;
 576                         adapter->tx_head_addr = pba << E1000_TX_HEAD_ADDR_SHIFT;
 577                         adapter->tx_fifo_size =
 578                                 (E1000_PBA_40K - pba) << E1000_PBA_BYTES_SHIFT;
 579                         atomic_set(&adapter->tx_fifo_stall, 0);
 580                 }
 581         } else if (hw->max_frame_size >  ETH_FRAME_LEN + ETH_FCS_LEN) {
 582                 /* adjust PBA for jumbo frames */
 583                 ew32(PBA, pba);
 584
 585                 /* To maintain wire speed transmits, the Tx FIFO should be
 586                  * large enough to accommodate two full transmit packets,
 587                  * rounded up to the next 1KB and expressed in KB.  Likewise,
 588                  * the Rx FIFO should be large enough to accommodate at least
 589                  * one full receive packet and is similarly rounded up and
 590                  * expressed in KB. */
 591                 pba = er32(PBA);
 592                 /* upper 16 bits has Tx packet buffer allocation size in KB */
 593                 tx_space = pba >> 16;
 594                 /* lower 16 bits has Rx packet buffer allocation size in KB */
 595                 pba &= 0xffff;
 596                 /*
 597                  * the tx fifo also stores 16 bytes of information about the tx
 598                  * but don't include ethernet FCS because hardware appends it
 599                  */
 600                 min_tx_space = (hw->max_frame_size +
 601                                 sizeof(struct e1000_tx_desc) -
 602                                 ETH_FCS_LEN) * 2;
 603                 min_tx_space = ALIGN(min_tx_space, 1024);
 604                 min_tx_space >>= 10;
 605                 /* software strips receive CRC, so leave room for it */
 606                 min_rx_space = hw->max_frame_size;
 607                 min_rx_space = ALIGN(min_rx_space, 1024);
 608                 min_rx_space >>= 10;
 609
 610                 /* If current Tx allocation is less than the min Tx FIFO size,
 611                  * and the min Tx FIFO size is less than the current Rx FIFO
 612                  * allocation, take space away from current Rx allocation */
 613                 if (tx_space < min_tx_space &&
 614                     ((min_tx_space - tx_space) < pba)) {
 615                         pba = pba - (min_tx_space - tx_space);
 616
 617                         /* PCI/PCIx hardware has PBA alignment constraints */
 618                         switch (hw->mac_type) {
 619                         case e1000_82545 ... e1000_82546_rev_3:
 620                                 pba &= ~(E1000_PBA_8K - 1);
 621                                 break;
 622                         default:
 623                                 break;
 624                         }
 625
 626                         /* if short on rx space, rx wins and must trump tx
 627                          * adjustment or use Early Receive if available */
 628                         if (pba < min_rx_space)
 629                                 pba = min_rx_space;
 630                 }
 631         }
 632
 633         ew32(PBA, pba);
 634
 635         /*
 636          * flow control settings:
 637          * The high water mark must be low enough to fit one full frame
 638          * (or the size used for early receive) above it in the Rx FIFO.
 639          * Set it to the lower of:
 640          * - 90% of the Rx FIFO size, and
 641          * - the full Rx FIFO size minus the early receive size (for parts
 642          *   with ERT support assuming ERT set to E1000_ERT_2048), or
 643          * - the full Rx FIFO size minus one full frame
 644          */
 645         hwm = min(((pba << 10) * 9 / 10),
 646                   ((pba << 10) - hw->max_frame_size));
 647
 648         hw->fc_high_water = hwm & 0xFFF8;       /* 8-byte granularity */
 649         hw->fc_low_water = hw->fc_high_water - 8;
 650         hw->fc_pause_time = E1000_FC_PAUSE_TIME;
 651         hw->fc_send_xon = 1;
 652         hw->fc = hw->original_fc;
 653
 654         /* Allow time for pending master requests to run */
 655         e1000_reset_hw(hw);
 656         if (hw->mac_type >= e1000_82544)
 657                 ew32(WUC, 0);
 658
 659         if (e1000_init_hw(hw))
 660                 e_dev_err("Hardware Error\n");
 661         e1000_update_mng_vlan(adapter);
 662
 663         /* if (adapter->hwflags & HWFLAGS_PHY_PWR_BIT) { */
 664         if (hw->mac_type >= e1000_82544 &&
 665             hw->autoneg == 1 &&
 666             hw->autoneg_advertised == ADVERTISE_1000_FULL) {
 667                 u32 ctrl = er32(CTRL);
 668                 /* clear phy power management bit if we are in gig only mode,
 669                  * which if enabled will attempt negotiation to 100Mb, which
 670                  * can cause a loss of link at power off or driver unload */
 671                 ctrl &= ~E1000_CTRL_SWDPIN3;
 672                 ew32(CTRL, ctrl);
 673         }
 674
 675         /* Enable h/w to recognize an 802.1Q VLAN Ethernet packet */
 676         ew32(VET, ETHERNET_IEEE_VLAN_TYPE);
 677
 678         e1000_reset_adaptive(hw);
 679         e1000_phy_get_info(hw, &adapter->phy_info);
 680
 681         e1000_release_manageability(adapter);
 682 }
 683
 684 /**
 685  *  Dump the eeprom for users having checksum issues
 686  **/
 687 static void e1000_dump_eeprom(struct e1000_adapter *adapter)
 688 {
 689         struct net_device *netdev = adapter->netdev;
 690         struct ethtool_eeprom eeprom;
 691         const struct ethtool_ops *ops = netdev->ethtool_ops;
 692         u8 *data;
 693         int i;
 694         u16 csum_old, csum_new = 0;
 695
 696         eeprom.len = ops->get_eeprom_len(netdev);
 697         eeprom.offset = 0;
 698
 699         data = kmalloc(eeprom.len, GFP_KERNEL);
 700         if (!data) {
 701                 pr_err("Unable to allocate memory to dump EEPROM data\n");
 702                 return;
 703         }
 704
 705         ops->get_eeprom(netdev, &eeprom, data);
 706
 707         csum_old = (data[EEPROM_CHECKSUM_REG * 2]) +
 708                    (data[EEPROM_CHECKSUM_REG * 2 + 1] << 8);
 709         for (i = 0; i < EEPROM_CHECKSUM_REG * 2; i += 2)
 710                 csum_new += data[i] + (data[i + 1] << 8);
 711         csum_new = EEPROM_SUM - csum_new;
 712
 713         pr_err("/*********************/\n");
 714         pr_err("Current EEPROM Checksum : 0x%04x\n", csum_old);
 715         pr_err("Calculated              : 0x%04x\n", csum_new);
 716
 717         pr_err("Offset    Values\n");
 718         pr_err("========  ======\n");
 719         print_hex_dump(KERN_ERR, "", DUMP_PREFIX_OFFSET, 16, 1, data, 128, 0);
 720
 721         pr_err("Include this output when contacting your support provider.\n");
 722         pr_err("This is not a software error! Something bad happened to\n");
 723         pr_err("your hardware or EEPROM image. Ignoring this problem could\n");
 724         pr_err("result in further problems, possibly loss of data,\n");
 725         pr_err("corruption or system hangs!\n");
 726         pr_err("The MAC Address will be reset to 00:00:00:00:00:00,\n");
 727         pr_err("which is invalid and requires you to set the proper MAC\n");
 728         pr_err("address manually before continuing to enable this network\n");
 729         pr_err("device. Please inspect the EEPROM dump and report the\n");
 730         pr_err("issue to your hardware vendor or Intel Customer Support.\n");
 731         pr_err("/*********************/\n");
 732
 733         kfree(data);
 734 }
 735
 736 /**
 737  * e1000_is_need_ioport - determine if an adapter needs ioport resources or not
 738  * @pdev: PCI device information struct
 739  *
 740  * Return true if an adapter needs ioport resources
 741  **/
 742 static int e1000_is_need_ioport(struct pci_dev *pdev)
 743 {
 744         switch (pdev->device) {
 745         case E1000_DEV_ID_82540EM:
 746         case E1000_DEV_ID_82540EM_LOM:
 747         case E1000_DEV_ID_82540EP:
 748         case E1000_DEV_ID_82540EP_LOM:
 749         case E1000_DEV_ID_82540EP_LP:
 750         case E1000_DEV_ID_82541EI:
 751         case E1000_DEV_ID_82541EI_MOBILE:
 752         case E1000_DEV_ID_82541ER:
 753         case E1000_DEV_ID_82541ER_LOM:
 754         case E1000_DEV_ID_82541GI:
 755         case E1000_DEV_ID_82541GI_LF:
 756         case E1000_DEV_ID_82541GI_MOBILE:
 757         case E1000_DEV_ID_82544EI_COPPER:
 758         case E1000_DEV_ID_82544EI_FIBER:
 759         case E1000_DEV_ID_82544GC_COPPER:
 760         case E1000_DEV_ID_82544GC_LOM:
 761         case E1000_DEV_ID_82545EM_COPPER:
 762         case E1000_DEV_ID_82545EM_FIBER:
 763         case E1000_DEV_ID_82546EB_COPPER:
 764         case E1000_DEV_ID_82546EB_FIBER:
 765         case E1000_DEV_ID_82546EB_QUAD_COPPER:
 766                 return true;
 767         default:
 768                 return false;
 769         }
 770 }
 771
 772 static const struct net_device_ops e1000_netdev_ops = {
 773         .ndo_open               = e1000_open,
 774         .ndo_stop               = e1000_close,
 775         .ndo_start_xmit         = e1000_xmit_frame,
 776         .ndo_get_stats          = e1000_get_stats,
 777         .ndo_set_rx_mode        = e1000_set_rx_mode,
 778         .ndo_set_mac_address    = e1000_set_mac,
 779         .ndo_tx_timeout         = e1000_tx_timeout,
 780         .ndo_change_mtu         = e1000_change_mtu,
 781         .ndo_do_ioctl           = e1000_ioctl,
 782         .ndo_validate_addr      = eth_validate_addr,
 783
 784         .ndo_vlan_rx_register   = e1000_vlan_rx_register,
 785         .ndo_vlan_rx_add_vid    = e1000_vlan_rx_add_vid,
 786         .ndo_vlan_rx_kill_vid   = e1000_vlan_rx_kill_vid,
 787 #ifdef CONFIG_NET_POLL_CONTROLLER
 788         .ndo_poll_controller    = e1000_netpoll,
 789 #endif
 790 };
 791
 792 /**
 793  * e1000_probe - Device Initialization Routine
 794  * @pdev: PCI device information struct
 795  * @ent: entry in e1000_pci_tbl
 796  *
 797  * Returns 0 on success, negative on failure
 798  *
 799  * e1000_probe initializes an adapter identified by a pci_dev structure.
 800  * The OS initialization, configuring of the adapter private structure,
 801  * and a hardware reset occur.
 802  **/
 803 static int __devinit e1000_probe(struct pci_dev *pdev,
 804                                  const struct pci_device_id *ent)
 805 {
 806         struct net_device *netdev;
 807         struct e1000_adapter *adapter;
 808         struct e1000_hw *hw;
 809
 810         static int cards_found = 0;
 811         static int global_quad_port_a = 0; /* global ksp3 port a indication */
 812         int i, err, pci_using_dac;
 813         u16 eeprom_data = 0;
 814         u16 eeprom_apme_mask = E1000_EEPROM_APME;
 815         int bars, need_ioport;
 816
 817         /* do not allocate ioport bars when not needed */
 818         need_ioport = e1000_is_need_ioport(pdev);
 819         if (need_ioport) {
 820                 bars = pci_select_bars(pdev, IORESOURCE_MEM | IORESOURCE_IO);
 821                 err = pci_enable_device(pdev);
 822         } else {
 823                 bars = pci_select_bars(pdev, IORESOURCE_MEM);
 824                 err = pci_enable_device_mem(pdev);
 825         }
 826         if (err)
 827                 return err;
 828
 829         if (!dma_set_mask(&pdev->dev, DMA_BIT_MASK(64)) &&
 830             !dma_set_coherent_mask(&pdev->dev, DMA_BIT_MASK(64))) {
 831                 pci_using_dac = 1;
 832         } else {
 833                 err = dma_set_mask(&pdev->dev, DMA_BIT_MASK(32));
 834                 if (err) {
 835                         err = dma_set_coherent_mask(&pdev->dev,
 836                                                     DMA_BIT_MASK(32));
 837                         if (err) {
 838                                 pr_err("No usable DMA config, aborting\n");
 839                                 goto err_dma;
 840                         }
 841                 }
 842                 pci_using_dac = 0;
 843         }
 844
 845         err = pci_request_selected_regions(pdev, bars, e1000_driver_name);
 846         if (err)
 847                 goto err_pci_reg;
 848
 849         pci_set_master(pdev);
 850         err = pci_save_state(pdev);
 851         if (err)
 852                 goto err_alloc_etherdev;
 853
 854         err = -ENOMEM;
 855         netdev = alloc_etherdev(sizeof(struct e1000_adapter));
 856         if (!netdev)
 857                 goto err_alloc_etherdev;
 858
 859         SET_NETDEV_DEV(netdev, &pdev->dev);
 860
 861         pci_set_drvdata(pdev, netdev);
 862         adapter = netdev_priv(netdev);
 863         adapter->netdev = netdev;
 864         adapter->pdev = pdev;
 865         adapter->msg_enable = (1 << debug) - 1;
 866         adapter->bars = bars;
 867         adapter->need_ioport = need_ioport;
 868
 869         hw = &adapter->hw;
 870         hw->back = adapter;
 871
 872         err = -EIO;
 873         hw->hw_addr = pci_ioremap_bar(pdev, BAR_0);
 874         if (!hw->hw_addr)
 875                 goto err_ioremap;
 876
 877         if (adapter->need_ioport) {
 878                 for (i = BAR_1; i <= BAR_5; i++) {
 879                         if (pci_resource_len(pdev, i) == 0)
 880                                 continue;
 881                         if (pci_resource_flags(pdev, i) & IORESOURCE_IO) {
 882                                 hw->io_base = pci_resource_start(pdev, i);
 883                                 break;
 884                         }
 885                 }
 886         }
 887
 888         netdev->netdev_ops = &e1000_netdev_ops;
 889         e1000_set_ethtool_ops(netdev);
 890         netdev->watchdog_timeo = 5 * HZ;
 891         netif_napi_add(netdev, &adapter->napi, e1000_clean, 64);
 892
 893         strncpy(netdev->name, pci_name(pdev), sizeof(netdev->name) - 1);
 894
 895         adapter->bd_number = cards_found;
 896
 897         /* setup the private structure */
 898
 899         err = e1000_sw_init(adapter);
 900         if (err)
 901                 goto err_sw_init;
 902
 903         err = -EIO;
 904
 905         if (hw->mac_type >= e1000_82543) {
 906                 netdev->features = NETIF_F_SG |
 907                                    NETIF_F_HW_CSUM |
 908                                    NETIF_F_HW_VLAN_TX |
 909                                    NETIF_F_HW_VLAN_RX |
 910                                    NETIF_F_HW_VLAN_FILTER;
 911         }
 912
 913         if ((hw->mac_type >= e1000_82544) &&
 914            (hw->mac_type != e1000_82547))
 915                 netdev->features |= NETIF_F_TSO;
 916
 917         if (pci_using_dac)
 918                 netdev->features |= NETIF_F_HIGHDMA;
 919
 920         netdev->vlan_features |= NETIF_F_TSO;
 921         netdev->vlan_features |= NETIF_F_HW_CSUM;
 922         netdev->vlan_features |= NETIF_F_SG;
 923
 924         adapter->en_mng_pt = e1000_enable_mng_pass_thru(hw);
 925
 926         /* initialize eeprom parameters */
 927         if (e1000_init_eeprom_params(hw)) {
 928                 e_err(probe, "EEPROM initialization failed\n");
 929                 goto err_eeprom;
 930         }
 931
 932         /* before reading the EEPROM, reset the controller to
 933          * put the device in a known good starting state */
 934
 935         e1000_reset_hw(hw);
 936
 937         /* make sure the EEPROM is good */
 938         if (e1000_validate_eeprom_checksum(hw) < 0) {
 939                 e_err(probe, "The EEPROM Checksum Is Not Valid\n");
 940                 e1000_dump_eeprom(adapter);
 941                 /*
 942                  * set MAC address to all zeroes to invalidate and temporary
 943                  * disable this device for the user. This blocks regular
 944                  * traffic while still permitting ethtool ioctls from reaching
 945                  * the hardware as well as allowing the user to run the
 946                  * interface after manually setting a hw addr using
 947                  * `ip set address`
 948                  */
 949                 memset(hw->mac_addr, 0, netdev->addr_len);
 950         } else {
 951                 /* copy the MAC address out of the EEPROM */
 952                 if (e1000_read_mac_addr(hw))
 953                         e_err(probe, "EEPROM Read Error\n");
 954         }
 955         /* don't block initalization here due to bad MAC address */
 956         memcpy(netdev->dev_addr, hw->mac_addr, netdev->addr_len);
 957         memcpy(netdev->perm_addr, hw->mac_addr, netdev->addr_len);
 958
 959         if (!is_valid_ether_addr(netdev->perm_addr))
 960                 e_err(probe, "Invalid MAC Address\n");
 961
 962         e1000_get_bus_info(hw);
 963
 964         init_timer(&adapter->tx_fifo_stall_timer);
 965         adapter->tx_fifo_stall_timer.function = &e1000_82547_tx_fifo_stall;
 966         adapter->tx_fifo_stall_timer.data = (unsigned long)adapter;
 967
 968         init_timer(&adapter->watchdog_timer);
 969         adapter->watchdog_timer.function = &e1000_watchdog;
 970         adapter->watchdog_timer.data = (unsigned long) adapter;
 971
 972         init_timer(&adapter->phy_info_timer);
 973         adapter->phy_info_timer.function = &e1000_update_phy_info;
 974         adapter->phy_info_timer.data = (unsigned long)adapter;
 975
 976         INIT_WORK(&adapter->reset_task, e1000_reset_task);
 977
 978         e1000_check_options(adapter);
 979
 980         /* Initial Wake on LAN setting
 981          * If APM wake is enabled in the EEPROM,
 982          * enable the ACPI Magic Packet filter
 983          */
 984
 985         switch (hw->mac_type) {
 986         case e1000_82542_rev2_0:
 987         case e1000_82542_rev2_1:
 988         case e1000_82543:
 989                 break;
 990         case e1000_82544:
 991                 e1000_read_eeprom(hw,
 992                         EEPROM_INIT_CONTROL2_REG, 1, &eeprom_data);
 993                 eeprom_apme_mask = E1000_EEPROM_82544_APM;
 994                 break;
 995         case e1000_82546:
 996         case e1000_82546_rev_3:
 997                 if (er32(STATUS) & E1000_STATUS_FUNC_1){
 998                         e1000_read_eeprom(hw,
 999                                 EEPROM_INIT_CONTROL3_PORT_B, 1, &eeprom_data);
1000                         break;
1001                 }
1002                 /* Fall Through */
1003         default:
1004                 e1000_read_eeprom(hw,
1005                         EEPROM_INIT_CONTROL3_PORT_A, 1, &eeprom_data);
1006                 break;
1007         }
1008         if (eeprom_data & eeprom_apme_mask)
1009                 adapter->eeprom_wol |= E1000_WUFC_MAG;
1010
1011         /* now that we have the eeprom settings, apply the special cases
1012          * where the eeprom may be wrong or the board simply won't support
1013          * wake on lan on a particular port */
1014         switch (pdev->device) {
1015         case E1000_DEV_ID_82546GB_PCIE:
1016                 adapter->eeprom_wol = 0;
1017                 break;
1018         case E1000_DEV_ID_82546EB_FIBER:
1019         case E1000_DEV_ID_82546GB_FIBER:
1020                 /* Wake events only supported on port A for dual fiber
1021                  * regardless of eeprom setting */
1022                 if (er32(STATUS) & E1000_STATUS_FUNC_1)
1023                         adapter->eeprom_wol = 0;
1024                 break;
1025         case E1000_DEV_ID_82546GB_QUAD_COPPER_KSP3:
1026                 /* if quad port adapter, disable WoL on all but port A */
1027                 if (global_quad_port_a != 0)
1028                         adapter->eeprom_wol = 0;
1029                 else
1030                         adapter->quad_port_a = 1;
1031                 /* Reset for multiple quad port adapters */
1032                 if (++global_quad_port_a == 4)
1033                         global_quad_port_a = 0;
1034                 break;
1035         }
1036
1037         /* initialize the wol settings based on the eeprom settings */
1038         adapter->wol = adapter->eeprom_wol;
1039         device_set_wakeup_enable(&adapter->pdev->dev, adapter->wol);
1040
1041         /* reset the hardware with the new settings */
1042         e1000_reset(adapter);
1043
1044         strcpy(netdev->name, "eth%d");
1045         err = register_netdev(netdev);
1046         if (err)
1047                 goto err_register;
1048
1049         /* print bus type/speed/width info */
1050         e_info(probe, "(PCI%s:%dMHz:%d-bit) %pM\n",
1051                ((hw->bus_type == e1000_bus_type_pcix) ? "-X" : ""),
1052                ((hw->bus_speed == e1000_bus_speed_133) ? 133 :
1053                 (hw->bus_speed == e1000_bus_speed_120) ? 120 :
1054                 (hw->bus_speed == e1000_bus_speed_100) ? 100 :
1055                 (hw->bus_speed == e1000_bus_speed_66) ? 66 : 33),
1056                ((hw->bus_width == e1000_bus_width_64) ? 64 : 32),
1057                netdev->dev_addr);
1058
1059         /* carrier off reporting is important to ethtool even BEFORE open */
1060         netif_carrier_off(netdev);
1061
1062         e_info(probe, "Intel(R) PRO/1000 Network Connection\n");
1063
1064         cards_found++;
1065         return 0;
1066
1067 err_register:
1068 err_eeprom:
1069         e1000_phy_hw_reset(hw);
1070
1071         if (hw->flash_address)
1072                 iounmap(hw->flash_address);
1073         kfree(adapter->tx_ring);
1074         kfree(adapter->rx_ring);
1075 err_sw_init:
1076         iounmap(hw->hw_addr);
1077 err_ioremap:
1078         free_netdev(netdev);
1079 err_alloc_etherdev:
1080         pci_release_selected_regions(pdev, bars);
1081 err_pci_reg:
1082 err_dma:
1083         pci_disable_device(pdev);
1084         return err;
1085 }
1086
1087 /**
1088  * e1000_remove - Device Removal Routine
1089  * @pdev: PCI device information struct
1090  *
1091  * e1000_remove is called by the PCI subsystem to alert the driver
1092  * that it should release a PCI device.  The could be caused by a
1093  * Hot-Plug event, or because the driver is going to be removed from
1094  * memory.
1095  **/
1096
1097 static void __devexit e1000_remove(struct pci_dev *pdev)
1098 {
1099         struct net_device *netdev = pci_get_drvdata(pdev);
1100         struct e1000_adapter *adapter = netdev_priv(netdev);
1101         struct e1000_hw *hw = &adapter->hw;
1102
1103         set_bit(__E1000_DOWN, &adapter->flags);
1104         del_timer_sync(&adapter->tx_fifo_stall_timer);
1105         del_timer_sync(&adapter->watchdog_timer);
1106         del_timer_sync(&adapter->phy_info_timer);
1107
1108         cancel_work_sync(&adapter->reset_task);
1109
1110         e1000_release_manageability(adapter);
1111
1112         unregister_netdev(netdev);
1113
1114         e1000_phy_hw_reset(hw);
1115
1116         kfree(adapter->tx_ring);
1117         kfree(adapter->rx_ring);
1118
1119         iounmap(hw->hw_addr);
1120         if (hw->flash_address)
1121                 iounmap(hw->flash_address);
1122         pci_release_selected_regions(pdev, adapter->bars);
1123
1124         free_netdev(netdev);
1125
1126         pci_disable_device(pdev);
1127 }
1128
1129 /**
1130  * e1000_sw_init - Initialize general software structures (struct e1000_adapter)
1131  * @adapter: board private structure to initialize
1132  *
1133  * e1000_sw_init initializes the Adapter private data structure.
1134  * Fields are initialized based on PCI device information and
1135  * OS network device settings (MTU size).
1136  **/
1137
1138 static int __devinit e1000_sw_init(struct e1000_adapter *adapter)
1139 {
1140         struct e1000_hw *hw = &adapter->hw;
1141         struct net_device *netdev = adapter->netdev;
1142         struct pci_dev *pdev = adapter->pdev;
1143
1144         /* PCI config space info */
1145
1146         hw->vendor_id = pdev->vendor;
1147         hw->device_id = pdev->device;
1148         hw->subsystem_vendor_id = pdev->subsystem_vendor;
1149         hw->subsystem_id = pdev->subsystem_device;
1150         hw->revision_id = pdev->revision;
1151
1152         pci_read_config_word(pdev, PCI_COMMAND, &hw->pci_cmd_word);
1153
1154         adapter->rx_buffer_len = MAXIMUM_ETHERNET_VLAN_SIZE;
1155         hw->max_frame_size = netdev->mtu +
1156                              ENET_HEADER_SIZE + ETHERNET_FCS_SIZE;
1157         hw->min_frame_size = MINIMUM_ETHERNET_FRAME_SIZE;
1158
1159         /* identify the MAC */
1160
1161         if (e1000_set_mac_type(hw)) {
1162                 e_err(probe, "Unknown MAC Type\n");
1163                 return -EIO;
1164         }
1165
1166         switch (hw->mac_type) {
1167         default:
1168                 break;
1169         case e1000_82541:
1170         case e1000_82547:
1171         case e1000_82541_rev_2:
1172         case e1000_82547_rev_2:
1173                 hw->phy_init_script = 1;
1174                 break;
1175         }
1176
1177         e1000_set_media_type(hw);
1178
1179         hw->wait_autoneg_complete = false;
1180         hw->tbi_compatibility_en = true;
1181         hw->adaptive_ifs = true;
1182
1183         /* Copper options */
1184
1185         if (hw->media_type == e1000_media_type_copper) {
1186                 hw->mdix = AUTO_ALL_MODES;
1187                 hw->disable_polarity_correction = false;
1188                 hw->master_slave = E1000_MASTER_SLAVE;
1189         }
1190
1191         adapter->num_tx_queues = 1;
1192         adapter->num_rx_queues = 1;
1193
1194         if (e1000_alloc_queues(adapter)) {
1195                 e_err(probe, "Unable to allocate memory for queues\n");
1196                 return -ENOMEM;
1197         }
1198
1199         /* Explicitly disable IRQ since the NIC can be in any state. */
1200         e1000_irq_disable(adapter);
1201
1202         spin_lock_init(&adapter->stats_lock);
1203
1204         set_bit(__E1000_DOWN, &adapter->flags);
1205
1206         return 0;
1207 }
1208
1209 /**
1210  * e1000_alloc_queues - Allocate memory for all rings
1211  * @adapter: board private structure to initialize
1212  *
1213  * We allocate one ring per queue at run-time since we don't know the
1214  * number of queues at compile-time.
1215  **/
1216
1217 static int __devinit e1000_alloc_queues(struct e1000_adapter *adapter)
1218 {
1219         adapter->tx_ring = kcalloc(adapter->num_tx_queues,
1220                                    sizeof(struct e1000_tx_ring), GFP_KERNEL);
1221         if (!adapter->tx_ring)
1222                 return -ENOMEM;
1223
1224         adapter->rx_ring = kcalloc(adapter->num_rx_queues,
1225                                    sizeof(struct e1000_rx_ring), GFP_KERNEL);
1226         if (!adapter->rx_ring) {
1227                 kfree(adapter->tx_ring);
1228                 return -ENOMEM;
1229         }
1230
1231         return E1000_SUCCESS;
1232 }
1233
1234 /**
1235  * e1000_open - Called when a network interface is made active
1236  * @netdev: network interface device structure
1237  *
1238  * Returns 0 on success, negative value on failure
1239  *
1240  * The open entry point is called when a network interface is made
1241  * active by the system (IFF_UP).  At this point all resources needed
1242  * for transmit and receive operations are allocated, the interrupt
1243  * handler is registered with the OS, the watchdog timer is started,
1244  * and the stack is notified that the interface is ready.
1245  **/
1246
1247 static int e1000_open(struct net_device *netdev)
1248 {
1249         struct e1000_adapter *adapter = netdev_priv(netdev);
1250         struct e1000_hw *hw = &adapter->hw;
1251         int err;
1252
1253         /* disallow open during test */
1254         if (test_bit(__E1000_TESTING, &adapter->flags))
1255                 return -EBUSY;
1256
1257         netif_carrier_off(netdev);
1258
1259         /* allocate transmit descriptors */
1260         err = e1000_setup_all_tx_resources(adapter);
1261         if (err)
1262                 goto err_setup_tx;
1263
1264         /* allocate receive descriptors */
1265         err = e1000_setup_all_rx_resources(adapter);
1266         if (err)
1267                 goto err_setup_rx;
1268
1269         e1000_power_up_phy(adapter);
1270
1271         adapter->mng_vlan_id = E1000_MNG_VLAN_NONE;
1272         if ((hw->mng_cookie.status &
1273                           E1000_MNG_DHCP_COOKIE_STATUS_VLAN_SUPPORT)) {
1274                 e1000_update_mng_vlan(adapter);
1275         }
1276
1277         /* before we allocate an interrupt, we must be ready to handle it.
1278          * Setting DEBUG_SHIRQ in the kernel makes it fire an interrupt
1279          * as soon as we call pci_request_irq, so we have to setup our
1280          * clean_rx handler before we do so.  */
1281         e1000_configure(adapter);
1282
1283         err = e1000_request_irq(adapter);
1284         if (err)
1285                 goto err_req_irq;
1286
1287         /* From here on the code is the same as e1000_up() */
1288         clear_bit(__E1000_DOWN, &adapter->flags);
1289
1290         napi_enable(&adapter->napi);
1291
1292         e1000_irq_enable(adapter);
1293
1294         netif_start_queue(netdev);
1295
1296         /* fire a link status change interrupt to start the watchdog */
1297         ew32(ICS, E1000_ICS_LSC);
1298
1299         return E1000_SUCCESS;
1300
1301 err_req_irq:
1302         e1000_power_down_phy(adapter);
1303         e1000_free_all_rx_resources(adapter);
1304 err_setup_rx:
1305         e1000_free_all_tx_resources(adapter);
1306 err_setup_tx:
1307         e1000_reset(adapter);
1308
1309         return err;
1310 }
1311
1312 /**
1313  * e1000_close - Disables a network interface
1314  * @netdev: network interface device structure
1315  *
1316  * Returns 0, this is not allowed to fail
1317  *
1318  * The close entry point is called when an interface is de-activated
1319  * by the OS.  The hardware is still under the drivers control, but
1320  * needs to be disabled.  A global MAC reset is issued to stop the
1321  * hardware, and all transmit and receive resources are freed.
1322  **/
1323
1324 static int e1000_close(struct net_device *netdev)
1325 {
1326         struct e1000_adapter *adapter = netdev_priv(netdev);
1327         struct e1000_hw *hw = &adapter->hw;
1328
1329         WARN_ON(test_bit(__E1000_RESETTING, &adapter->flags));
1330         e1000_down(adapter);
1331         e1000_power_down_phy(adapter);
1332         e1000_free_irq(adapter);
1333
1334         e1000_free_all_tx_resources(adapter);
1335         e1000_free_all_rx_resources(adapter);
1336
1337         /* kill manageability vlan ID if supported, but not if a vlan with
1338          * the same ID is registered on the host OS (let 8021q kill it) */
1339         if ((hw->mng_cookie.status &
1340                           E1000_MNG_DHCP_COOKIE_STATUS_VLAN_SUPPORT) &&
1341              !(adapter->vlgrp &&
1342                vlan_group_get_device(adapter->vlgrp, adapter->mng_vlan_id))) {
1343                 e1000_vlan_rx_kill_vid(netdev, adapter->mng_vlan_id);
1344         }
1345
1346         return 0;
1347 }
1348
1349 /**
1350  * e1000_check_64k_bound - check that memory doesn't cross 64kB boundary
1351  * @adapter: address of board private structure
1352  * @start: address of beginning of memory
1353  * @len: length of memory
1354  **/
1355 static bool e1000_check_64k_bound(struct e1000_adapter *adapter, void *start,
1356                                   unsigned long len)
1357 {
1358         struct e1000_hw *hw = &adapter->hw;
1359         unsigned long begin = (unsigned long)start;
1360         unsigned long end = begin + len;
1361
1362         /* First rev 82545 and 82546 need to not allow any memory
1363          * write location to cross 64k boundary due to errata 23 */
1364         if (hw->mac_type == e1000_82545 ||
1365             hw->mac_type == e1000_82546) {
1366                 return ((begin ^ (end - 1)) >> 16) != 0 ? false : true;
1367         }
1368
1369         return true;
1370 }
1371
1372 /**
1373  * e1000_setup_tx_resources - allocate Tx resources (Descriptors)
1374  * @adapter: board private structure
1375  * @txdr:    tx descriptor ring (for a specific queue) to setup
1376  *
1377  * Return 0 on success, negative on failure
1378  **/
1379
1380 static int e1000_setup_tx_resources(struct e1000_adapter *adapter,
1381                                     struct e1000_tx_ring *txdr)
1382 {
1383         struct pci_dev *pdev = adapter->pdev;
1384         int size;
1385
1386         size = sizeof(struct e1000_buffer) * txdr->count;
1387         txdr->buffer_info = vmalloc(size);
1388         if (!txdr->buffer_info) {
1389                 e_err(probe, "Unable to allocate memory for the Tx descriptor "
1390                       "ring\n");
1391                 return -ENOMEM;
1392         }
1393         memset(txdr->buffer_info, 0, size);
1394
1395         /* round up to nearest 4K */
1396
1397         txdr->size = txdr->count * sizeof(struct e1000_tx_desc);
1398         txdr->size = ALIGN(txdr->size, 4096);
1399
1400         txdr->desc = dma_alloc_coherent(&pdev->dev, txdr->size, &txdr->dma,
1401                                         GFP_KERNEL);
1402         if (!txdr->desc) {
1403 setup_tx_desc_die:
1404                 vfree(txdr->buffer_info);
1405                 e_err(probe, "Unable to allocate memory for the Tx descriptor "
1406                       "ring\n");
1407                 return -ENOMEM;
1408         }
1409
1410         /* Fix for errata 23, can't cross 64kB boundary */
1411         if (!e1000_check_64k_bound(adapter, txdr->desc, txdr->size)) {
1412                 void *olddesc = txdr->desc;
1413                 dma_addr_t olddma = txdr->dma;
1414                 e_err(tx_err, "txdr align check failed: %u bytes at %p\n",
1415                       txdr->size, txdr->desc);
1416                 /* Try again, without freeing the previous */
1417                 txdr->desc = dma_alloc_coherent(&pdev->dev, txdr->size,
1418                                                 &txdr->dma, GFP_KERNEL);
1419                 /* Failed allocation, critical failure */
1420                 if (!txdr->desc) {
1421                         dma_free_coherent(&pdev->dev, txdr->size, olddesc,
1422                                           olddma);
1423                         goto setup_tx_desc_die;
1424                 }
1425
1426                 if (!e1000_check_64k_bound(adapter, txdr->desc, txdr->size)) {
1427                         /* give up */
1428                         dma_free_coherent(&pdev->dev, txdr->size, txdr->desc,
1429                                           txdr->dma);
1430                         dma_free_coherent(&pdev->dev, txdr->size, olddesc,
1431                                           olddma);
1432                         e_err(probe, "Unable to allocate aligned memory "
1433                               "for the transmit descriptor ring\n");
1434                         vfree(txdr->buffer_info);
1435                         return -ENOMEM;
1436                 } else {
1437                         /* Free old allocation, new allocation was successful */
1438                         dma_free_coherent(&pdev->dev, txdr->size, olddesc,
1439                                           olddma);
1440                 }
1441         }
1442         memset(txdr->desc, 0, txdr->size);
1443
1444         txdr->next_to_use = 0;
1445         txdr->next_to_clean = 0;
1446
1447         return 0;
1448 }
1449
1450 /**
1451  * e1000_setup_all_tx_resources - wrapper to allocate Tx resources
1452  *                                (Descriptors) for all queues
1453  * @adapter: board private structure
1454  *
1455  * Return 0 on success, negative on failure
1456  **/
1457
1458 int e1000_setup_all_tx_resources(struct e1000_adapter *adapter)
1459 {
1460         int i, err = 0;
1461
1462         for (i = 0; i < adapter->num_tx_queues; i++) {
1463                 err = e1000_setup_tx_resources(adapter, &adapter->tx_ring[i]);
1464                 if (err) {
1465                         e_err(probe, "Allocation for Tx Queue %u failed\n", i);
1466                         for (i-- ; i >= 0; i--)
1467                                 e1000_free_tx_resources(adapter,
1468                                                         &adapter->tx_ring[i]);
1469                         break;
1470                 }
1471         }
1472
1473         return err;
1474 }
1475
1476 /**
1477  * e1000_configure_tx - Configure 8254x Transmit Unit after Reset
1478  * @adapter: board private structure
1479  *
1480  * Configure the Tx unit of the MAC after a reset.
1481  **/
1482
1483 static void e1000_configure_tx(struct e1000_adapter *adapter)
1484 {
1485         u64 tdba;
1486         struct e1000_hw *hw = &adapter->hw;
1487         u32 tdlen, tctl, tipg;
1488         u32 ipgr1, ipgr2;
1489
1490         /* Setup the HW Tx Head and Tail descriptor pointers */
1491
1492         switch (adapter->num_tx_queues) {
1493         case 1:
1494         default:
1495                 tdba = adapter->tx_ring[0].dma;
1496                 tdlen = adapter->tx_ring[0].count *
1497                         sizeof(struct e1000_tx_desc);
1498                 ew32(TDLEN, tdlen);
1499                 ew32(TDBAH, (tdba >> 32));
1500                 ew32(TDBAL, (tdba & 0x00000000ffffffffULL));
1501                 ew32(TDT, 0);
1502                 ew32(TDH, 0);
1503                 adapter->tx_ring[0].tdh = ((hw->mac_type >= e1000_82543) ? E1000_TDH : E1000_82542_TDH);
1504                 adapter->tx_ring[0].tdt = ((hw->mac_type >= e1000_82543) ? E1000_TDT : E1000_82542_TDT);
1505                 break;
1506         }
1507
1508         /* Set the default values for the Tx Inter Packet Gap timer */
1509         if ((hw->media_type == e1000_media_type_fiber ||
1510              hw->media_type == e1000_media_type_internal_serdes))
1511                 tipg = DEFAULT_82543_TIPG_IPGT_FIBER;
1512         else
1513                 tipg = DEFAULT_82543_TIPG_IPGT_COPPER;
1514
1515         switch (hw->mac_type) {
1516         case e1000_82542_rev2_0:
1517         case e1000_82542_rev2_1:
1518                 tipg = DEFAULT_82542_TIPG_IPGT;
1519                 ipgr1 = DEFAULT_82542_TIPG_IPGR1;
1520                 ipgr2 = DEFAULT_82542_TIPG_IPGR2;
1521                 break;
1522         default:
1523                 ipgr1 = DEFAULT_82543_TIPG_IPGR1;
1524                 ipgr2 = DEFAULT_82543_TIPG_IPGR2;
1525                 break;
1526         }
1527         tipg |= ipgr1 << E1000_TIPG_IPGR1_SHIFT;
1528         tipg |= ipgr2 << E1000_TIPG_IPGR2_SHIFT;
1529         ew32(TIPG, tipg);
1530
1531         /* Set the Tx Interrupt Delay register */
1532
1533         ew32(TIDV, adapter->tx_int_delay);
1534         if (hw->mac_type >= e1000_82540)
1535                 ew32(TADV, adapter->tx_abs_int_delay);
1536
1537         /* Program the Transmit Control Register */
1538
1539         tctl = er32(TCTL);
1540         tctl &= ~E1000_TCTL_CT;
1541         tctl |= E1000_TCTL_PSP | E1000_TCTL_RTLC |
1542                 (E1000_COLLISION_THRESHOLD << E1000_CT_SHIFT);
1543
1544         e1000_config_collision_dist(hw);
1545
1546         /* Setup Transmit Descriptor Settings for eop descriptor */
1547         adapter->txd_cmd = E1000_TXD_CMD_EOP | E1000_TXD_CMD_IFCS;
1548
1549         /* only set IDE if we are delaying interrupts using the timers */
1550         if (adapter->tx_int_delay)
1551                 adapter->txd_cmd |= E1000_TXD_CMD_IDE;
1552
1553         if (hw->mac_type < e1000_82543)
1554                 adapter->txd_cmd |= E1000_TXD_CMD_RPS;
1555         else
1556                 adapter->txd_cmd |= E1000_TXD_CMD_RS;
1557
1558         /* Cache if we're 82544 running in PCI-X because we'll
1559          * need this to apply a workaround later in the send path. */
1560         if (hw->mac_type == e1000_82544 &&
1561             hw->bus_type == e1000_bus_type_pcix)
1562                 adapter->pcix_82544 = 1;
1563
1564         ew32(TCTL, tctl);
1565
1566 }
1567
1568 /**
1569  * e1000_setup_rx_resources - allocate Rx resources (Descriptors)
1570  * @adapter: board private structure
1571  * @rxdr:    rx descriptor ring (for a specific queue) to setup
1572  *
1573  * Returns 0 on success, negative on failure
1574  **/
1575
1576 static int e1000_setup_rx_resources(struct e1000_adapter *adapter,
1577                                     struct e1000_rx_ring *rxdr)
1578 {
1579         struct pci_dev *pdev = adapter->pdev;
1580         int size, desc_len;
1581
1582         size = sizeof(struct e1000_buffer) * rxdr->count;
1583         rxdr->buffer_info = vmalloc(size);
1584         if (!rxdr->buffer_info) {
1585                 e_err(probe, "Unable to allocate memory for the Rx descriptor "
1586                       "ring\n");
1587                 return -ENOMEM;
1588         }
1589         memset(rxdr->buffer_info, 0, size);
1590
1591         desc_len = sizeof(struct e1000_rx_desc);
1592
1593         /* Round up to nearest 4K */
1594
1595         rxdr->size = rxdr->count * desc_len;
1596         rxdr->size = ALIGN(rxdr->size, 4096);
1597
1598         rxdr->desc = dma_alloc_coherent(&pdev->dev, rxdr->size, &rxdr->dma,
1599                                         GFP_KERNEL);
1600
1601         if (!rxdr->desc) {
1602                 e_err(probe, "Unable to allocate memory for the Rx descriptor "
1603                       "ring\n");
1604 setup_rx_desc_die:
1605                 vfree(rxdr->buffer_info);
1606                 return -ENOMEM;
1607         }
1608
1609         /* Fix for errata 23, can't cross 64kB boundary */
1610         if (!e1000_check_64k_bound(adapter, rxdr->desc, rxdr->size)) {
1611                 void *olddesc = rxdr->desc;
1612                 dma_addr_t olddma = rxdr->dma;
1613                 e_err(rx_err, "rxdr align check failed: %u bytes at %p\n",
1614                       rxdr->size, rxdr->desc);
1615                 /* Try again, without freeing the previous */
1616                 rxdr->desc = dma_alloc_coherent(&pdev->dev, rxdr->size,
1617                                                 &rxdr->dma, GFP_KERNEL);
1618                 /* Failed allocation, critical failure */
1619                 if (!rxdr->desc) {
1620                         dma_free_coherent(&pdev->dev, rxdr->size, olddesc,
1621                                           olddma);
1622                         e_err(probe, "Unable to allocate memory for the Rx "
1623                               "descriptor ring\n");
1624                         goto setup_rx_desc_die;
1625                 }
1626
1627                 if (!e1000_check_64k_bound(adapter, rxdr->desc, rxdr->size)) {
1628                         /* give up */
1629                         dma_free_coherent(&pdev->dev, rxdr->size, rxdr->desc,
1630                                           rxdr->dma);
1631                         dma_free_coherent(&pdev->dev, rxdr->size, olddesc,
1632                                           olddma);
1633                         e_err(probe, "Unable to allocate aligned memory for "
1634                               "the Rx descriptor ring\n");
1635                         goto setup_rx_desc_die;
1636                 } else {
1637                         /* Free old allocation, new allocation was successful */
1638                         dma_free_coherent(&pdev->dev, rxdr->size, olddesc,
1639                                           olddma);
1640                 }
1641         }
1642         memset(rxdr->desc, 0, rxdr->size);
1643
1644         rxdr->next_to_clean = 0;
1645         rxdr->next_to_use = 0;
1646         rxdr->rx_skb_top = NULL;
1647
1648         return 0;
1649 }
1650
1651 /**
1652  * e1000_setup_all_rx_resources - wrapper to allocate Rx resources
1653  *                                (Descriptors) for all queues
1654  * @adapter: board private structure
1655  *
1656  * Return 0 on success, negative on failure
1657  **/
1658
1659 int e1000_setup_all_rx_resources(struct e1000_adapter *adapter)
1660 {
1661         int i, err = 0;
1662
1663         for (i = 0; i < adapter->num_rx_queues; i++) {
1664                 err = e1000_setup_rx_resources(adapter, &adapter->rx_ring[i]);
1665                 if (err) {
1666                         e_err(probe, "Allocation for Rx Queue %u failed\n", i);
1667                         for (i-- ; i >= 0; i--)
1668                                 e1000_free_rx_resources(adapter,
1669                                                         &adapter->rx_ring[i]);
1670                         break;
1671                 }
1672         }
1673
1674         return err;
1675 }
1676
1677 /**
1678  * e1000_setup_rctl - configure the receive control registers
1679  * @adapter: Board private structure
1680  **/
1681 static void e1000_setup_rctl(struct e1000_adapter *adapter)
1682 {
1683         struct e1000_hw *hw = &adapter->hw;
1684         u32 rctl;
1685
1686         rctl = er32(RCTL);
1687
1688         rctl &= ~(3 << E1000_RCTL_MO_SHIFT);
1689
1690         rctl |= E1000_RCTL_EN | E1000_RCTL_BAM |
1691                 E1000_RCTL_LBM_NO | E1000_RCTL_RDMTS_HALF |
1692                 (hw->mc_filter_type << E1000_RCTL_MO_SHIFT);
1693
1694         if (hw->tbi_compatibility_on == 1)
1695                 rctl |= E1000_RCTL_SBP;
1696         else
1697                 rctl &= ~E1000_RCTL_SBP;
1698
1699         if (adapter->netdev->mtu <= ETH_DATA_LEN)
1700                 rctl &= ~E1000_RCTL_LPE;
1701         else
1702                 rctl |= E1000_RCTL_LPE;
1703
1704         /* Setup buffer sizes */
1705         rctl &= ~E1000_RCTL_SZ_4096;
1706         rctl |= E1000_RCTL_BSEX;
1707         switch (adapter->rx_buffer_len) {
1708                 case E1000_RXBUFFER_2048:
1709                 default:
1710                         rctl |= E1000_RCTL_SZ_2048;
1711                         rctl &= ~E1000_RCTL_BSEX;
1712                         break;
1713                 case E1000_RXBUFFER_4096:
1714                         rctl |= E1000_RCTL_SZ_4096;
1715                         break;
1716                 case E1000_RXBUFFER_8192:
1717                         rctl |= E1000_RCTL_SZ_8192;
1718                         break;
1719                 case E1000_RXBUFFER_16384:
1720                         rctl |= E1000_RCTL_SZ_16384;
1721                         break;
1722         }
1723
1724         ew32(RCTL, rctl);
1725 }
1726
1727 /**
1728  * e1000_configure_rx - Configure 8254x Receive Unit after Reset
1729  * @adapter: board private structure
1730  *
1731  * Configure the Rx unit of the MAC after a reset.
1732  **/
1733
1734 static void e1000_configure_rx(struct e1000_adapter *adapter)
1735 {
1736         u64 rdba;
1737         struct e1000_hw *hw = &adapter->hw;
1738         u32 rdlen, rctl, rxcsum;
1739
1740         if (adapter->netdev->mtu > ETH_DATA_LEN) {
1741                 rdlen = adapter->rx_ring[0].count *
1742                         sizeof(struct e1000_rx_desc);
1743                 adapter->clean_rx = e1000_clean_jumbo_rx_irq;
1744                 adapter->alloc_rx_buf = e1000_alloc_jumbo_rx_buffers;
1745         } else {
1746                 rdlen = adapter->rx_ring[0].count *
1747                         sizeof(struct e1000_rx_desc);
1748                 adapter->clean_rx = e1000_clean_rx_irq;
1749                 adapter->alloc_rx_buf = e1000_alloc_rx_buffers;
1750         }
1751
1752         /* disable receives while setting up the descriptors */
1753         rctl = er32(RCTL);
1754         ew32(RCTL, rctl & ~E1000_RCTL_EN);
1755
1756         /* set the Receive Delay Timer Register */
1757         ew32(RDTR, adapter->rx_int_delay);
1758
1759         if (hw->mac_type >= e1000_82540) {
1760                 ew32(RADV, adapter->rx_abs_int_delay);
1761                 if (adapter->itr_setting != 0)
1762                         ew32(ITR, 1000000000 / (adapter->itr * 256));
1763         }
1764
1765         /* Setup the HW Rx Head and Tail Descriptor Pointers and
1766          * the Base and Length of the Rx Descriptor Ring */
1767         switch (adapter->num_rx_queues) {
1768         case 1:
1769         default:
1770                 rdba = adapter->rx_ring[0].dma;
1771                 ew32(RDLEN, rdlen);
1772                 ew32(RDBAH, (rdba >> 32));
1773                 ew32(RDBAL, (rdba & 0x00000000ffffffffULL));
1774                 ew32(RDT, 0);
1775                 ew32(RDH, 0);
1776                 adapter->rx_ring[0].rdh = ((hw->mac_type >= e1000_82543) ? E1000_RDH : E1000_82542_RDH);
1777                 adapter->rx_ring[0].rdt = ((hw->mac_type >= e1000_82543) ? E1000_RDT : E1000_82542_RDT);
1778                 break;
1779         }
1780
1781         /* Enable 82543 Receive Checksum Offload for TCP and UDP */
1782         if (hw->mac_type >= e1000_82543) {
1783                 rxcsum = er32(RXCSUM);
1784                 if (adapter->rx_csum)
1785                         rxcsum |= E1000_RXCSUM_TUOFL;
1786                 else
1787                         /* don't need to clear IPPCSE as it defaults to 0 */
1788                         rxcsum &= ~E1000_RXCSUM_TUOFL;
1789                 ew32(RXCSUM, rxcsum);
1790         }
1791
1792         /* Enable Receives */
1793         ew32(RCTL, rctl);
1794 }
1795
1796 /**
1797  * e1000_free_tx_resources - Free Tx Resources per Queue
1798  * @adapter: board private structure
1799  * @tx_ring: Tx descriptor ring for a specific queue
1800  *
1801  * Free all transmit software resources
1802  **/
1803
1804 static void e1000_free_tx_resources(struct e1000_adapter *adapter,
1805                                     struct e1000_tx_ring *tx_ring)
1806 {
1807         struct pci_dev *pdev = adapter->pdev;
1808
1809         e1000_clean_tx_ring(adapter, tx_ring);
1810
1811         vfree(tx_ring->buffer_info);
1812         tx_ring->buffer_info = NULL;
1813
1814         dma_free_coherent(&pdev->dev, tx_ring->size, tx_ring->desc,
1815                           tx_ring->dma);
1816
1817         tx_ring->desc = NULL;
1818 }
1819
1820 /**
1821  * e1000_free_all_tx_resources - Free Tx Resources for All Queues
1822  * @adapter: board private structure
1823  *
1824  * Free all transmit software resources
1825  **/
1826
1827 void e1000_free_all_tx_resources(struct e1000_adapter *adapter)
1828 {
1829         int i;
1830
1831         for (i = 0; i < adapter->num_tx_queues; i++)
1832                 e1000_free_tx_resources(adapter, &adapter->tx_ring[i]);
1833 }
1834
1835 static void e1000_unmap_and_free_tx_resource(struct e1000_adapter *adapter,
1836                                              struct e1000_buffer *buffer_info)
1837 {
1838         if (buffer_info->dma) {
1839                 if (buffer_info->mapped_as_page)
1840                         dma_unmap_page(&adapter->pdev->dev, buffer_info->dma,
1841                                        buffer_info->length, DMA_TO_DEVICE);
1842                 else
1843                         dma_unmap_single(&adapter->pdev->dev, buffer_info->dma,
1844                                          buffer_info->length,
1845                                          DMA_TO_DEVICE);
1846                 buffer_info->dma = 0;
1847         }
1848         if (buffer_info->skb) {
1849                 dev_kfree_skb_any(buffer_info->skb);
1850                 buffer_info->skb = NULL;
1851         }
1852         buffer_info->time_stamp = 0;
1853         /* buffer_info must be completely set up in the transmit path */
1854 }
1855
1856 /**
1857  * e1000_clean_tx_ring - Free Tx Buffers
1858  * @adapter: board private structure
1859  * @tx_ring: ring to be cleaned
1860  **/
1861
1862 static void e1000_clean_tx_ring(struct e1000_adapter *adapter,
1863                                 struct e1000_tx_ring *tx_ring)
1864 {
1865         struct e1000_hw *hw = &adapter->hw;
1866         struct e1000_buffer *buffer_info;
1867         unsigned long size;
1868         unsigned int i;
1869
1870         /* Free all the Tx ring sk_buffs */
1871
1872         for (i = 0; i < tx_ring->count; i++) {
1873                 buffer_info = &tx_ring->buffer_info[i];
1874                 e1000_unmap_and_free_tx_resource(adapter, buffer_info);
1875         }
1876
1877         size = sizeof(struct e1000_buffer) * tx_ring->count;
1878         memset(tx_ring->buffer_info, 0, size);
1879
1880         /* Zero out the descriptor ring */
1881
1882         memset(tx_ring->desc, 0, tx_ring->size);
1883
1884         tx_ring->next_to_use = 0;
1885         tx_ring->next_to_clean = 0;
1886         tx_ring->last_tx_tso = 0;
1887
1888         writel(0, hw->hw_addr + tx_ring->tdh);
1889         writel(0, hw->hw_addr + tx_ring->tdt);
1890 }
1891
1892 /**
1893  * e1000_clean_all_tx_rings - Free Tx Buffers for all queues
1894  * @adapter: board private structure
1895  **/
1896
1897 static void e1000_clean_all_tx_rings(struct e1000_adapter *adapter)
1898 {
1899         int i;
1900
1901         for (i = 0; i < adapter->num_tx_queues; i++)
1902                 e1000_clean_tx_ring(adapter, &adapter->tx_ring[i]);
1903 }
1904
1905 /**
1906  * e1000_free_rx_resources - Free Rx Resources
1907  * @adapter: board private structure
1908  * @rx_ring: ring to clean the resources from
1909  *
1910  * Free all receive software resources
1911  **/
1912
1913 static void e1000_free_rx_resources(struct e1000_adapter *adapter,
1914                                     struct e1000_rx_ring *rx_ring)
1915 {
1916         struct pci_dev *pdev = adapter->pdev;
1917
1918         e1000_clean_rx_ring(adapter, rx_ring);
1919
1920         vfree(rx_ring->buffer_info);
1921         rx_ring->buffer_info = NULL;
1922
1923         dma_free_coherent(&pdev->dev, rx_ring->size, rx_ring->desc,
1924                           rx_ring->dma);
1925
1926         rx_ring->desc = NULL;
1927 }
1928
1929 /**
1930  * e1000_free_all_rx_resources - Free Rx Resources for All Queues
1931  * @adapter: board private structure
1932  *
1933  * Free all receive software resources
1934  **/
1935
1936 void e1000_free_all_rx_resources(struct e1000_adapter *adapter)
1937 {
1938         int i;
1939
1940         for (i = 0; i < adapter->num_rx_queues; i++)
1941                 e1000_free_rx_resources(adapter, &adapter->rx_ring[i]);
1942 }
1943
1944 /**
1945  * e1000_clean_rx_ring - Free Rx Buffers per Queue
1946  * @adapter: board private structure
1947  * @rx_ring: ring to free buffers from
1948  **/
1949
1950 static void e1000_clean_rx_ring(struct e1000_adapter *adapter,
1951                                 struct e1000_rx_ring *rx_ring)
1952 {
1953         struct e1000_hw *hw = &adapter->hw;
1954         struct e1000_buffer *buffer_info;
1955         struct pci_dev *pdev = adapter->pdev;
1956         unsigned long size;
1957         unsigned int i;
1958
1959         /* Free all the Rx ring sk_buffs */
1960         for (i = 0; i < rx_ring->count; i++) {
1961                 buffer_info = &rx_ring->buffer_info[i];
1962                 if (buffer_info->dma &&
1963                     adapter->clean_rx == e1000_clean_rx_irq) {
1964                         dma_unmap_single(&pdev->dev, buffer_info->dma,
1965                                          buffer_info->length,
1966                                          DMA_FROM_DEVICE);
1967                 } else if (buffer_info->dma &&
1968                            adapter->clean_rx == e1000_clean_jumbo_rx_irq) {
1969                         dma_unmap_page(&pdev->dev, buffer_info->dma,
1970                                        buffer_info->length,
1971                                        DMA_FROM_DEVICE);
1972                 }
1973
1974                 buffer_info->dma = 0;
1975                 if (buffer_info->page) {
1976                         put_page(buffer_info->page);
1977                         buffer_info->page = NULL;
1978                 }
1979                 if (buffer_info->skb) {
1980                         dev_kfree_skb(buffer_info->skb);
1981                         buffer_info->skb = NULL;
1982                 }
1983         }
1984
1985         /* there also may be some cached data from a chained receive */
1986         if (rx_ring->rx_skb_top) {
1987                 dev_kfree_skb(rx_ring->rx_skb_top);
1988                 rx_ring->rx_skb_top = NULL;
1989         }
1990
1991         size = sizeof(struct e1000_buffer) * rx_ring->count;
1992         memset(rx_ring->buffer_info, 0, size);
1993
1994         /* Zero out the descriptor ring */
1995         memset(rx_ring->desc, 0, rx_ring->size);
1996
1997         rx_ring->next_to_clean = 0;
1998         rx_ring->next_to_use = 0;
1999
2000         writel(0, hw->hw_addr + rx_ring->rdh);
2001         writel(0, hw->hw_addr + rx_ring->rdt);
2002 }
2003
2004 /**
2005  * e1000_clean_all_rx_rings - Free Rx Buffers for all queues
2006  * @adapter: board private structure
2007  **/
2008
2009 static void e1000_clean_all_rx_rings(struct e1000_adapter *adapter)
2010 {
2011         int i;
2012
2013         for (i = 0; i < adapter->num_rx_queues; i++)
2014                 e1000_clean_rx_ring(adapter, &adapter->rx_ring[i]);
2015 }
2016
2017 /* The 82542 2.0 (revision 2) needs to have the receive unit in reset
2018  * and memory write and invalidate disabled for certain operations
2019  */
2020 static void e1000_enter_82542_rst(struct e1000_adapter *adapter)
2021 {
2022         struct e1000_hw *hw = &adapter->hw;
2023         struct net_device *netdev = adapter->netdev;
2024         u32 rctl;
2025
2026         e1000_pci_clear_mwi(hw);
2027
2028         rctl = er32(RCTL);
2029         rctl |= E1000_RCTL_RST;
2030         ew32(RCTL, rctl);
2031         E1000_WRITE_FLUSH();
2032         mdelay(5);
2033
2034         if (netif_running(netdev))
2035                 e1000_clean_all_rx_rings(adapter);
2036 }
2037
2038 static void e1000_leave_82542_rst(struct e1000_adapter *adapter)
2039 {
2040         struct e1000_hw *hw = &adapter->hw;
2041         struct net_device *netdev = adapter->netdev;
2042         u32 rctl;
2043
2044         rctl = er32(RCTL);
2045         rctl &= ~E1000_RCTL_RST;
2046         ew32(RCTL, rctl);
2047         E1000_WRITE_FLUSH();
2048         mdelay(5);
2049
2050         if (hw->pci_cmd_word & PCI_COMMAND_INVALIDATE)
2051                 e1000_pci_set_mwi(hw);
2052
2053         if (netif_running(netdev)) {
2054                 /* No need to loop, because 82542 supports only 1 queue */
2055                 struct e1000_rx_ring *ring = &adapter->rx_ring[0];
2056                 e1000_configure_rx(adapter);
2057                 adapter->alloc_rx_buf(adapter, ring, E1000_DESC_UNUSED(ring));
2058         }
2059 }
2060
2061 /**
2062  * e1000_set_mac - Change the Ethernet Address of the NIC
2063  * @netdev: network interface device structure
2064  * @p: pointer to an address structure
2065  *
2066  * Returns 0 on success, negative on failure
2067  **/
2068
2069 static int e1000_set_mac(struct net_device *netdev, void *p)
2070 {
2071         struct e1000_adapter *adapter = netdev_priv(netdev);
2072         struct e1000_hw *hw = &adapter->hw;
2073         struct sockaddr *addr = p;
2074
2075         if (!is_valid_ether_addr(addr->sa_data))
2076                 return -EADDRNOTAVAIL;
2077
2078         /* 82542 2.0 needs to be in reset to write receive address registers */
2079
2080         if (hw->mac_type == e1000_82542_rev2_0)
2081                 e1000_enter_82542_rst(adapter);
2082
2083         memcpy(netdev->dev_addr, addr->sa_data, netdev->addr_len);
2084         memcpy(hw->mac_addr, addr->sa_data, netdev->addr_len);
2085
2086         e1000_rar_set(hw, hw->mac_addr, 0);
2087
2088         if (hw->mac_type == e1000_82542_rev2_0)
2089                 e1000_leave_82542_rst(adapter);
2090
2091         return 0;
2092 }
2093
2094 /**
2095  * e1000_set_rx_mode - Secondary Unicast, Multicast and Promiscuous mode set
2096  * @netdev: network interface device structure
2097  *
2098  * The set_rx_mode entry point is called whenever the unicast or multicast
2099  * address lists or the network interface flags are updated. This routine is
2100  * responsible for configuring the hardware for proper unicast, multicast,
2101  * promiscuous mode, and all-multi behavior.
2102  **/
2103
2104 static void e1000_set_rx_mode(struct net_device *netdev)
2105 {
2106         struct e1000_adapter *adapter = netdev_priv(netdev);
2107         struct e1000_hw *hw = &adapter->hw;
2108         struct netdev_hw_addr *ha;
2109         bool use_uc = false;
2110         u32 rctl;
2111         u32 hash_value;
2112         int i, rar_entries = E1000_RAR_ENTRIES;
2113         int mta_reg_count = E1000_NUM_MTA_REGISTERS;
2114         u32 *mcarray = kcalloc(mta_reg_count, sizeof(u32), GFP_ATOMIC);
2115
2116         if (!mcarray) {
2117                 e_err(probe, "memory allocation failed\n");
2118                 return;
2119         }
2120
2121         /* Check for Promiscuous and All Multicast modes */
2122
2123         rctl = er32(RCTL);
2124
2125         if (netdev->flags & IFF_PROMISC) {
2126                 rctl |= (E1000_RCTL_UPE | E1000_RCTL_MPE);
2127                 rctl &= ~E1000_RCTL_VFE;
2128         } else {
2129                 if (netdev->flags & IFF_ALLMULTI)
2130                         rctl |= E1000_RCTL_MPE;
2131                 else
2132                         rctl &= ~E1000_RCTL_MPE;
2133                 /* Enable VLAN filter if there is a VLAN */
2134                 if (adapter->vlgrp)
2135                         rctl |= E1000_RCTL_VFE;
2136         }
2137
2138         if (netdev_uc_count(netdev) > rar_entries - 1) {
2139                 rctl |= E1000_RCTL_UPE;
2140         } else if (!(netdev->flags & IFF_PROMISC)) {
2141                 rctl &= ~E1000_RCTL_UPE;
2142                 use_uc = true;
2143         }
2144
2145         ew32(RCTL, rctl);
2146
2147         /* 82542 2.0 needs to be in reset to write receive address registers */
2148
2149         if (hw->mac_type == e1000_82542_rev2_0)
2150                 e1000_enter_82542_rst(adapter);
2151
2152         /* load the first 14 addresses into the exact filters 1-14. Unicast
2153          * addresses take precedence to avoid disabling unicast filtering
2154          * when possible.
2155          *
2156          * RAR 0 is used for the station MAC adddress
2157          * if there are not 14 addresses, go ahead and clear the filters
2158          */
2159         i = 1;
2160         if (use_uc)
2161                 netdev_for_each_uc_addr(ha, netdev) {
2162                         if (i == rar_entries)
2163                                 break;
2164                         e1000_rar_set(hw, ha->addr, i++);
2165                 }
2166
2167         netdev_for_each_mc_addr(ha, netdev) {
2168                 if (i == rar_entries) {
2169                         /* load any remaining addresses into the hash table */
2170                         u32 hash_reg, hash_bit, mta;
2171                         hash_value = e1000_hash_mc_addr(hw, ha->addr);
2172                         hash_reg = (hash_value >> 5) & 0x7F;
2173                         hash_bit = hash_value & 0x1F;
2174                         mta = (1 << hash_bit);
2175                         mcarray[hash_reg] |= mta;
2176                 } else {
2177                         e1000_rar_set(hw, ha->addr, i++);
2178                 }
2179         }
2180
2181         for (; i < rar_entries; i++) {
2182                 E1000_WRITE_REG_ARRAY(hw, RA, i << 1, 0);
2183                 E1000_WRITE_FLUSH();
2184                 E1000_WRITE_REG_ARRAY(hw, RA, (i << 1) + 1, 0);
2185                 E1000_WRITE_FLUSH();
2186         }
2187
2188         /* write the hash table completely, write from bottom to avoid
2189          * both stupid write combining chipsets, and flushing each write */
2190         for (i = mta_reg_count - 1; i >= 0 ; i--) {
2191                 /*
2192                  * If we are on an 82544 has an errata where writing odd
2193                  * offsets overwrites the previous even offset, but writing
2194                  * backwards over the range solves the issue by always
2195                  * writing the odd offset first
2196                  */
2197                 E1000_WRITE_REG_ARRAY(hw, MTA, i, mcarray[i]);
2198         }
2199         E1000_WRITE_FLUSH();
2200
2201         if (hw->mac_type == e1000_82542_rev2_0)
2202                 e1000_leave_82542_rst(adapter);
2203
2204         kfree(mcarray);
2205 }
2206
2207 /* Need to wait a few seconds after link up to get diagnostic information from
2208  * the phy */
2209
2210 static void e1000_update_phy_info(unsigned long data)
2211 {
2212         struct e1000_adapter *adapter = (struct e1000_adapter *)data;
2213         struct e1000_hw *hw = &adapter->hw;
2214         e1000_phy_get_info(hw, &adapter->phy_info);
2215 }
2216
2217 /**
2218  * e1000_82547_tx_fifo_stall - Timer Call-back
2219  * @data: pointer to adapter cast into an unsigned long
2220  **/
2221
2222 static void e1000_82547_tx_fifo_stall(unsigned long data)
2223 {
2224         struct e1000_adapter *adapter = (struct e1000_adapter *)data;
2225         struct e1000_hw *hw = &adapter->hw;
2226         struct net_device *netdev = adapter->netdev;
2227         u32 tctl;
2228
2229         if (atomic_read(&adapter->tx_fifo_stall)) {
2230                 if ((er32(TDT) == er32(TDH)) &&
2231                    (er32(TDFT) == er32(TDFH)) &&
2232                    (er32(TDFTS) == er32(TDFHS))) {
2233                         tctl = er32(TCTL);
2234                         ew32(TCTL, tctl & ~E1000_TCTL_EN);
2235                         ew32(TDFT, adapter->tx_head_addr);
2236                         ew32(TDFH, adapter->tx_head_addr);
2237                         ew32(TDFTS, adapter->tx_head_addr);
2238                         ew32(TDFHS, adapter->tx_head_addr);
2239                         ew32(TCTL, tctl);
2240                         E1000_WRITE_FLUSH();
2241
2242                         adapter->tx_fifo_head = 0;
2243                         atomic_set(&adapter->tx_fifo_stall, 0);
2244                         netif_wake_queue(netdev);
2245                 } else if (!test_bit(__E1000_DOWN, &adapter->flags)) {
2246                         mod_timer(&adapter->tx_fifo_stall_timer, jiffies + 1);
2247                 }
2248         }
2249 }
2250
2251 bool e1000_has_link(struct e1000_adapter *adapter)
2252 {
2253         struct e1000_hw *hw = &adapter->hw;
2254         bool link_active = false;
2255
2256         /* get_link_status is set on LSC (link status) interrupt or
2257          * rx sequence error interrupt.  get_link_status will stay
2258          * false until the e1000_check_for_link establishes link
2259          * for copper adapters ONLY
2260          */
2261         switch (hw->media_type) {
2262         case e1000_media_type_copper:
2263                 if (hw->get_link_status) {
2264                         e1000_check_for_link(hw);
2265                         link_active = !hw->get_link_status;
2266                 } else {
2267                         link_active = true;
2268                 }
2269                 break;
2270         case e1000_media_type_fiber:
2271                 e1000_check_for_link(hw);
2272                 link_active = !!(er32(STATUS) & E1000_STATUS_LU);
2273                 break;
2274         case e1000_media_type_internal_serdes:
2275                 e1000_check_for_link(hw);
2276                 link_active = hw->serdes_has_link;
2277                 break;
2278         default:
2279                 break;
2280         }
2281
2282         return link_active;
2283 }
2284
2285 /**
2286  * e1000_watchdog - Timer Call-back
2287  * @data: pointer to adapter cast into an unsigned long
2288  **/
2289 static void e1000_watchdog(unsigned long data)
2290 {
2291         struct e1000_adapter *adapter = (struct e1000_adapter *)data;
2292         struct e1000_hw *hw = &adapter->hw;
2293         struct net_device *netdev = adapter->netdev;
2294         struct e1000_tx_ring *txdr = adapter->tx_ring;
2295         u32 link, tctl;
2296
2297         link = e1000_has_link(adapter);
2298         if ((netif_carrier_ok(netdev)) && link)
2299                 goto link_up;
2300
2301         if (link) {
2302                 if (!netif_carrier_ok(netdev)) {
2303                         u32 ctrl;
2304                         bool txb2b = true;
2305                         /* update snapshot of PHY registers on LSC */
2306                         e1000_get_speed_and_duplex(hw,
2307                                                    &adapter->link_speed,
2308                                                    &adapter->link_duplex);
2309
2310                         ctrl = er32(CTRL);
2311                         pr_info("%s NIC Link is Up %d Mbps %s, "
2312                                 "Flow Control: %s\n",
2313                                 netdev->name,
2314                                 adapter->link_speed,
2315                                 adapter->link_duplex == FULL_DUPLEX ?
2316                                 "Full Duplex" : "Half Duplex",
2317                                 ((ctrl & E1000_CTRL_TFCE) && (ctrl &
2318                                 E1000_CTRL_RFCE)) ? "RX/TX" : ((ctrl &
2319                                 E1000_CTRL_RFCE) ? "RX" : ((ctrl &
2320                                 E1000_CTRL_TFCE) ? "TX" : "None")));
2321
2322                         /* adjust timeout factor according to speed/duplex */
2323                         adapter->tx_timeout_factor = 1;
2324                         switch (adapter->link_speed) {
2325                         case SPEED_10:
2326                                 txb2b = false;
2327                                 adapter->tx_timeout_factor = 16;
2328                                 break;
2329                         case SPEED_100:
2330                                 txb2b = false;
2331                                 /* maybe add some timeout factor ? */
2332                                 break;
2333                         }
2334
2335                         /* enable transmits in the hardware */
2336                         tctl = er32(TCTL);
2337                         tctl |= E1000_TCTL_EN;
2338                         ew32(TCTL, tctl);
2339
2340                         netif_carrier_on(netdev);
2341                         if (!test_bit(__E1000_DOWN, &adapter->flags))
2342                                 mod_timer(&adapter->phy_info_timer,
2343                                           round_jiffies(jiffies + 2 * HZ));
2344                         adapter->smartspeed = 0;
2345                 }
2346         } else {
2347                 if (netif_carrier_ok(netdev)) {
2348                         adapter->link_speed = 0;
2349                         adapter->link_duplex = 0;
2350                         pr_info("%s NIC Link is Down\n",
2351                                 netdev->name);
2352                         netif_carrier_off(netdev);
2353
2354                         if (!test_bit(__E1000_DOWN, &adapter->flags))
2355                                 mod_timer(&adapter->phy_info_timer,
2356                                           round_jiffies(jiffies + 2 * HZ));
2357                 }
2358
2359                 e1000_smartspeed(adapter);
2360         }
2361
2362 link_up:
2363         e1000_update_stats(adapter);
2364
2365         hw->tx_packet_delta = adapter->stats.tpt - adapter->tpt_old;
2366         adapter->tpt_old = adapter->stats.tpt;
2367         hw->collision_delta = adapter->stats.colc - adapter->colc_old;
2368         adapter->colc_old = adapter->stats.colc;
2369
2370         adapter->gorcl = adapter->stats.gorcl - adapter->gorcl_old;
2371         adapter->gorcl_old = adapter->stats.gorcl;
2372         adapter->gotcl = adapter->stats.gotcl - adapter->gotcl_old;
2373         adapter->gotcl_old = adapter->stats.gotcl;
2374
2375         e1000_update_adaptive(hw);
2376
2377         if (!netif_carrier_ok(netdev)) {
2378                 if (E1000_DESC_UNUSED(txdr) + 1 < txdr->count) {
2379                         /* We've lost link, so the controller stops DMA,
2380                          * but we've got queued Tx work that's never going
2381                          * to get done, so reset controller to flush Tx.
2382                          * (Do the reset outside of interrupt context). */
2383                         adapter->tx_timeout_count++;
2384                         schedule_work(&adapter->reset_task);
2385                         /* return immediately since reset is imminent */
2386                         return;
2387                 }
2388         }
2389
2390         /* Simple mode for Interrupt Throttle Rate (ITR) */
2391         if (hw->mac_type >= e1000_82540 && adapter->itr_setting == 4) {
2392                 /*
2393                  * Symmetric Tx/Rx gets a reduced ITR=2000;
2394                  * Total asymmetrical Tx or Rx gets ITR=8000;
2395                  * everyone else is between 2000-8000.
2396                  */
2397                 u32 goc = (adapter->gotcl + adapter->gorcl) / 10000;
2398                 u32 dif = (adapter->gotcl > adapter->gorcl ?
2399                             adapter->gotcl - adapter->gorcl :
2400                             adapter->gorcl - adapter->gotcl) / 10000;
2401                 u32 itr = goc > 0 ? (dif * 6000 / goc + 2000) : 8000;
2402
2403                 ew32(ITR, 1000000000 / (itr * 256));
2404         }
2405
2406         /* Cause software interrupt to ensure rx ring is cleaned */
2407         ew32(ICS, E1000_ICS_RXDMT0);
2408
2409         /* Force detection of hung controller every watchdog period */
2410         adapter->detect_tx_hung = true;
2411
2412         /* Reset the timer */
2413         if (!test_bit(__E1000_DOWN, &adapter->flags))
2414                 mod_timer(&adapter->watchdog_timer,
2415                           round_jiffies(jiffies + 2 * HZ));
2416 }
2417
2418 enum latency_range {
2419         lowest_latency = 0,
2420         low_latency = 1,
2421         bulk_latency = 2,
2422         latency_invalid = 255
2423 };
2424
2425 /**
2426  * e1000_update_itr - update the dynamic ITR value based on statistics
2427  * @adapter: pointer to adapter
2428  * @itr_setting: current adapter->itr
2429  * @packets: the number of packets during this measurement interval
2430  * @bytes: the number of bytes during this measurement interval
2431  *
2432  *      Stores a new ITR value based on packets and byte
2433  *      counts during the last interrupt.  The advantage of per interrupt
2434  *      computation is faster updates and more accurate ITR for the current
2435  *      traffic pattern.  Constants in this function were computed
2436  *      based on theoretical maximum wire speed and thresholds were set based
2437  *      on testing data as well as attempting to minimize response time
2438  *      while increasing bulk throughput.
2439  *      this functionality is controlled by the InterruptThrottleRate module
2440  *      parameter (see e1000_param.c)
2441  **/
2442 static unsigned int e1000_update_itr(struct e1000_adapter *adapter,
2443                                      u16 itr_setting, int packets, int bytes)
2444 {
2445         unsigned int retval = itr_setting;
2446         struct e1000_hw *hw = &adapter->hw;
2447
2448         if (unlikely(hw->mac_type < e1000_82540))
2449                 goto update_itr_done;
2450
2451         if (packets == 0)
2452                 goto update_itr_done;
2453
2454         switch (itr_setting) {
2455         case lowest_latency:
2456                 /* jumbo frames get bulk treatment*/
2457                 if (bytes/packets > 8000)
2458                         retval = bulk_latency;
2459                 else if ((packets < 5) && (bytes > 512))
2460                         retval = low_latency;
2461                 break;
2462         case low_latency:  /* 50 usec aka 20000 ints/s */
2463                 if (bytes > 10000) {
2464                         /* jumbo frames need bulk latency setting */
2465                         if (bytes/packets > 8000)
2466                                 retval = bulk_latency;
2467                         else if ((packets < 10) || ((bytes/packets) > 1200))
2468                                 retval = bulk_latency;
2469                         else if ((packets > 35))
2470                                 retval = lowest_latency;
2471                 } else if (bytes/packets > 2000)
2472                         retval = bulk_latency;
2473                 else if (packets <= 2 && bytes < 512)
2474                         retval = lowest_latency;
2475                 break;
2476         case bulk_latency: /* 250 usec aka 4000 ints/s */
2477                 if (bytes > 25000) {
2478                         if (packets > 35)
2479                                 retval = low_latency;
2480                 } else if (bytes < 6000) {
2481                         retval = low_latency;
2482                 }
2483                 break;
2484         }
2485
2486 update_itr_done:
2487         return retval;
2488 }
2489
2490 static void e1000_set_itr(struct e1000_adapter *adapter)
2491 {
2492         struct e1000_hw *hw = &adapter->hw;
2493         u16 current_itr;
2494         u32 new_itr = adapter->itr;
2495
2496         if (unlikely(hw->mac_type < e1000_82540))
2497                 return;
2498
2499         /* for non-gigabit speeds, just fix the interrupt rate at 4000 */
2500         if (unlikely(adapter->link_speed != SPEED_1000)) {
2501                 current_itr = 0;
2502                 new_itr = 4000;
2503                 goto set_itr_now;
2504         }
2505
2506         adapter->tx_itr = e1000_update_itr(adapter,
2507                                     adapter->tx_itr,
2508                                     adapter->total_tx_packets,
2509                                     adapter->total_tx_bytes);
2510         /* conservative mode (itr 3) eliminates the lowest_latency setting */
2511         if (adapter->itr_setting == 3 && adapter->tx_itr == lowest_latency)
2512                 adapter->tx_itr = low_latency;
2513
2514         adapter->rx_itr = e1000_update_itr(adapter,
2515                                     adapter->rx_itr,
2516                                     adapter->total_rx_packets,
2517                                     adapter->total_rx_bytes);
2518         /* conservative mode (itr 3) eliminates the lowest_latency setting */
2519         if (adapter->itr_setting == 3 && adapter->rx_itr == lowest_latency)
2520                 adapter->rx_itr = low_latency;
2521
2522         current_itr = max(adapter->rx_itr, adapter->tx_itr);
2523
2524         switch (current_itr) {
2525         /* counts and packets in update_itr are dependent on these numbers */
2526         case lowest_latency:
2527                 new_itr = 70000;
2528                 break;
2529         case low_latency:
2530                 new_itr = 20000; /* aka hwitr = ~200 */
2531                 break;
2532         case bulk_latency:
2533                 new_itr = 4000;
2534                 break;
2535         default:
2536                 break;
2537         }
2538
2539 set_itr_now:
2540         if (new_itr != adapter->itr) {
2541                 /* this attempts to bias the interrupt rate towards Bulk
2542                  * by adding intermediate steps when interrupt rate is
2543                  * increasing */
2544                 new_itr = new_itr > adapter->itr ?
2545                              min(adapter->itr + (new_itr >> 2), new_itr) :
2546                              new_itr;
2547                 adapter->itr = new_itr;
2548                 ew32(ITR, 1000000000 / (new_itr * 256));
2549         }
2550 }
2551
2552 #define E1000_TX_FLAGS_CSUM             0x00000001
2553 #define E1000_TX_FLAGS_VLAN             0x00000002
2554 #define E1000_TX_FLAGS_TSO              0x00000004
2555 #define E1000_TX_FLAGS_IPV4             0x00000008
2556 #define E1000_TX_FLAGS_VLAN_MASK        0xffff0000
2557 #define E1000_TX_FLAGS_VLAN_SHIFT       16
2558
2559 static int e1000_tso(struct e1000_adapter *adapter,
2560                      struct e1000_tx_ring *tx_ring, struct sk_buff *skb)
2561 {
2562         struct e1000_context_desc *context_desc;
2563         struct e1000_buffer *buffer_info;
2564         unsigned int i;
2565         u32 cmd_length = 0;
2566         u16 ipcse = 0, tucse, mss;
2567         u8 ipcss, ipcso, tucss, tucso, hdr_len;
2568         int err;
2569
2570         if (skb_is_gso(skb)) {
2571                 if (skb_header_cloned(skb)) {
2572                         err = pskb_expand_head(skb, 0, 0, GFP_ATOMIC);
2573                         if (err)
2574                                 return err;
2575                 }
2576
2577                 hdr_len = skb_transport_offset(skb) + tcp_hdrlen(skb);
2578                 mss = skb_shinfo(skb)->gso_size;
2579                 if (skb->protocol == htons(ETH_P_IP)) {
2580                         struct iphdr *iph = ip_hdr(skb);
2581                         iph->tot_len = 0;
2582                         iph->check = 0;
2583                         tcp_hdr(skb)->check = ~csum_tcpudp_magic(iph->saddr,
2584                                                                  iph->daddr, 0,
2585                                                                  IPPROTO_TCP,
2586                                                                  0);
2587                         cmd_length = E1000_TXD_CMD_IP;
2588                         ipcse = skb_transport_offset(skb) - 1;
2589                 } else if (skb->protocol == htons(ETH_P_IPV6)) {
2590                         ipv6_hdr(skb)->payload_len = 0;
2591                         tcp_hdr(skb)->check =
2592                                 ~csum_ipv6_magic(&ipv6_hdr(skb)->saddr,
2593                                                  &ipv6_hdr(skb)->daddr,
2594                                                  0, IPPROTO_TCP, 0);
2595                         ipcse = 0;
2596                 }
2597                 ipcss = skb_network_offset(skb);
2598                 ipcso = (void *)&(ip_hdr(skb)->check) - (void *)skb->data;
2599                 tucss = skb_transport_offset(skb);
2600                 tucso = (void *)&(tcp_hdr(skb)->check) - (void *)skb->data;
2601                 tucse = 0;
2602
2603                 cmd_length |= (E1000_TXD_CMD_DEXT | E1000_TXD_CMD_TSE |
2604                                E1000_TXD_CMD_TCP | (skb->len - (hdr_len)));
2605
2606                 i = tx_ring->next_to_use;
2607                 context_desc = E1000_CONTEXT_DESC(*tx_ring, i);
2608                 buffer_info = &tx_ring->buffer_info[i];
2609
2610                 context_desc->lower_setup.ip_fields.ipcss  = ipcss;
2611                 context_desc->lower_setup.ip_fields.ipcso  = ipcso;
2612                 context_desc->lower_setup.ip_fields.ipcse  = cpu_to_le16(ipcse);
2613                 context_desc->upper_setup.tcp_fields.tucss = tucss;
2614                 context_desc->upper_setup.tcp_fields.tucso = tucso;
2615                 context_desc->upper_setup.tcp_fields.tucse = cpu_to_le16(tucse);
2616                 context_desc->tcp_seg_setup.fields.mss     = cpu_to_le16(mss);
2617                 context_desc->tcp_seg_setup.fields.hdr_len = hdr_len;
2618                 context_desc->cmd_and_length = cpu_to_le32(cmd_length);
2619
2620                 buffer_info->time_stamp = jiffies;
2621                 buffer_info->next_to_watch = i;
2622
2623                 if (++i == tx_ring->count) i = 0;
2624                 tx_ring->next_to_use = i;
2625
2626                 return true;
2627         }
2628         return false;
2629 }
2630
2631 static bool e1000_tx_csum(struct e1000_adapter *adapter,
2632                           struct e1000_tx_ring *tx_ring, struct sk_buff *skb)
2633 {
2634         struct e1000_context_desc *context_desc;
2635         struct e1000_buffer *buffer_info;
2636         unsigned int i;
2637         u8 css;
2638         u32 cmd_len = E1000_TXD_CMD_DEXT;
2639
2640         if (skb->ip_summed != CHECKSUM_PARTIAL)
2641                 return false;
2642
2643         switch (skb->protocol) {
2644         case cpu_to_be16(ETH_P_IP):
2645                 if (ip_hdr(skb)->protocol == IPPROTO_TCP)
2646                         cmd_len |= E1000_TXD_CMD_TCP;
2647                 break;
2648         case cpu_to_be16(ETH_P_IPV6):
2649                 /* XXX not handling all IPV6 headers */
2650                 if (ipv6_hdr(skb)->nexthdr == IPPROTO_TCP)
2651                         cmd_len |= E1000_TXD_CMD_TCP;
2652                 break;
2653         default:
2654                 if (unlikely(net_ratelimit()))
2655                         e_warn(drv, "checksum_partial proto=%x!\n",
2656                                skb->protocol);
2657                 break;
2658         }
2659
2660         css = skb_transport_offset(skb);
2661
2662         i = tx_ring->next_to_use;
2663         buffer_info = &tx_ring->buffer_info[i];
2664         context_desc = E1000_CONTEXT_DESC(*tx_ring, i);
2665
2666         context_desc->lower_setup.ip_config = 0;
2667         context_desc->upper_setup.tcp_fields.tucss = css;
2668         context_desc->upper_setup.tcp_fields.tucso =
2669                 css + skb->csum_offset;
2670         context_desc->upper_setup.tcp_fields.tucse = 0;
2671         context_desc->tcp_seg_setup.data = 0;
2672         context_desc->cmd_and_length = cpu_to_le32(cmd_len);
2673
2674         buffer_info->time_stamp = jiffies;
2675         buffer_info->next_to_watch = i;
2676
2677         if (unlikely(++i == tx_ring->count)) i = 0;
2678         tx_ring->next_to_use = i;
2679
2680         return true;
2681 }
2682
2683 #define E1000_MAX_TXD_PWR       12
2684 #define E1000_MAX_DATA_PER_TXD  (1<<E1000_MAX_TXD_PWR)
2685
2686 static int e1000_tx_map(struct e1000_adapter *adapter,
2687                         struct e1000_tx_ring *tx_ring,
2688                         struct sk_buff *skb, unsigned int first,
2689                         unsigned int max_per_txd, unsigned int nr_frags,
2690                         unsigned int mss)
2691 {
2692         struct e1000_hw *hw = &adapter->hw;
2693         struct pci_dev *pdev = adapter->pdev;
2694         struct e1000_buffer *buffer_info;
2695         unsigned int len = skb_headlen(skb);
2696         unsigned int offset = 0, size, count = 0, i;
2697         unsigned int f;
2698
2699         i = tx_ring->next_to_use;
2700
2701         while (len) {
2702                 buffer_info = &tx_ring->buffer_info[i];
2703                 size = min(len, max_per_txd);
2704                 /* Workaround for Controller erratum --
2705                  * descriptor for non-tso packet in a linear SKB that follows a
2706                  * tso gets written back prematurely before the data is fully
2707                  * DMA'd to the controller */
2708                 if (!skb->data_len && tx_ring->last_tx_tso &&
2709                     !skb_is_gso(skb)) {
2710                         tx_ring->last_tx_tso = 0;
2711                         size -= 4;
2712                 }
2713
2714                 /* Workaround for premature desc write-backs
2715                  * in TSO mode.  Append 4-byte sentinel desc */
2716                 if (unlikely(mss && !nr_frags && size == len && size > 8))
2717                         size -= 4;
2718                 /* work-around for errata 10 and it applies
2719                  * to all controllers in PCI-X mode
2720                  * The fix is to make sure that the first descriptor of a
2721                  * packet is smaller than 2048 - 16 - 16 (or 2016) bytes
2722                  */
2723                 if (unlikely((hw->bus_type == e1000_bus_type_pcix) &&
2724                                 (size > 2015) && count == 0))
2725                         size = 2015;
2726
2727                 /* Workaround for potential 82544 hang in PCI-X.  Avoid
2728                  * terminating buffers within evenly-aligned dwords. */
2729                 if (unlikely(adapter->pcix_82544 &&
2730                    !((unsigned long)(skb->data + offset + size - 1) & 4) &&
2731                    size > 4))
2732                         size -= 4;
2733
2734                 buffer_info->length = size;
2735                 /* set time_stamp *before* dma to help avoid a possible race */
2736                 buffer_info->time_stamp = jiffies;
2737                 buffer_info->mapped_as_page = false;
2738                 buffer_info->dma = dma_map_single(&pdev->dev,
2739                                                   skb->data + offset,
2740                                                   size, DMA_TO_DEVICE);
2741                 if (dma_mapping_error(&pdev->dev, buffer_info->dma))
2742                         goto dma_error;
2743                 buffer_info->next_to_watch = i;
2744
2745                 len -= size;
2746                 offset += size;
2747                 count++;
2748                 if (len) {
2749                         i++;
2750                         if (unlikely(i == tx_ring->count))
2751                                 i = 0;
2752                 }
2753         }
2754
2755         for (f = 0; f < nr_frags; f++) {
2756                 struct skb_frag_struct *frag;
2757
2758                 frag = &skb_shinfo(skb)->frags[f];
2759                 len = frag->size;
2760                 offset = frag->page_offset;
2761
2762                 while (len) {
2763                         i++;
2764                         if (unlikely(i == tx_ring->count))
2765                                 i = 0;
2766
2767                         buffer_info = &tx_ring->buffer_info[i];
2768                         size = min(len, max_per_txd);
2769                         /* Workaround for premature desc write-backs
2770                          * in TSO mode.  Append 4-byte sentinel desc */
2771                         if (unlikely(mss && f == (nr_frags-1) && size == len && size > 8))
2772                                 size -= 4;
2773                         /* Workaround for potential 82544 hang in PCI-X.
2774                          * Avoid terminating buffers within evenly-aligned
2775                          * dwords. */
2776                         if (unlikely(adapter->pcix_82544 &&
2777                             !((unsigned long)(page_to_phys(frag->page) + offset
2778                                               + size - 1) & 4) &&
2779                             size > 4))
2780                                 size -= 4;
2781
2782                         buffer_info->length = size;
2783                         buffer_info->time_stamp = jiffies;
2784                         buffer_info->mapped_as_page = true;
2785                         buffer_info->dma = dma_map_page(&pdev->dev, frag->page,
2786                                                         offset, size,
2787                                                         DMA_TO_DEVICE);
2788                         if (dma_mapping_error(&pdev->dev, buffer_info->dma))
2789                                 goto dma_error;
2790                         buffer_info->next_to_watch = i;
2791
2792                         len -= size;
2793                         offset += size;
2794                         count++;
2795                 }
2796         }
2797
2798         tx_ring->buffer_info[i].skb = skb;
2799         tx_ring->buffer_info[first].next_to_watch = i;
2800
2801         return count;
2802
2803 dma_error:
2804         dev_err(&pdev->dev, "TX DMA map failed\n");
2805         buffer_info->dma = 0;
2806         if (count)
2807                 count--;
2808
2809         while (count--) {
2810                 if (i==0)
2811                         i += tx_ring->count;
2812                 i--;
2813                 buffer_info = &tx_ring->buffer_info[i];
2814                 e1000_unmap_and_free_tx_resource(adapter, buffer_info);
2815         }
2816
2817         return 0;
2818 }
2819
2820 static void e1000_tx_queue(struct e1000_adapter *adapter,
2821                            struct e1000_tx_ring *tx_ring, int tx_flags,
2822                            int count)
2823 {
2824         struct e1000_hw *hw = &adapter->hw;
2825         struct e1000_tx_desc *tx_desc = NULL;
2826         struct e1000_buffer *buffer_info;
2827         u32 txd_upper = 0, txd_lower = E1000_TXD_CMD_IFCS;
2828         unsigned int i;
2829
2830         if (likely(tx_flags & E1000_TX_FLAGS_TSO)) {
2831                 txd_lower |= E1000_TXD_CMD_DEXT | E1000_TXD_DTYP_D |
2832                              E1000_TXD_CMD_TSE;
2833                 txd_upper |= E1000_TXD_POPTS_TXSM << 8;
2834
2835                 if (likely(tx_flags & E1000_TX_FLAGS_IPV4))
2836                         txd_upper |= E1000_TXD_POPTS_IXSM << 8;
2837         }
2838
2839         if (likely(tx_flags & E1000_TX_FLAGS_CSUM)) {
2840                 txd_lower |= E1000_TXD_CMD_DEXT | E1000_TXD_DTYP_D;
2841                 txd_upper |= E1000_TXD_POPTS_TXSM << 8;
2842         }
2843
2844         if (unlikely(tx_flags & E1000_TX_FLAGS_VLAN)) {
2845                 txd_lower |= E1000_TXD_CMD_VLE;
2846                 txd_upper |= (tx_flags & E1000_TX_FLAGS_VLAN_MASK);
2847         }
2848
2849         i = tx_ring->next_to_use;
2850
2851         while (count--) {
2852                 buffer_info = &tx_ring->buffer_info[i];
2853                 tx_desc = E1000_TX_DESC(*tx_ring, i);
2854                 tx_desc->buffer_addr = cpu_to_le64(buffer_info->dma);
2855                 tx_desc->lower.data =
2856                         cpu_to_le32(txd_lower | buffer_info->length);
2857                 tx_desc->upper.data = cpu_to_le32(txd_upper);
2858                 if (unlikely(++i == tx_ring->count)) i = 0;
2859         }
2860
2861         tx_desc->lower.data |= cpu_to_le32(adapter->txd_cmd);
2862
2863         /* Force memory writes to complete before letting h/w
2864          * know there are new descriptors to fetch.  (Only
2865          * applicable for weak-ordered memory model archs,
2866          * such as IA-64). */
2867         wmb();
2868
2869         tx_ring->next_to_use = i;
2870         writel(i, hw->hw_addr + tx_ring->tdt);
2871         /* we need this if more than one processor can write to our tail
2872          * at a time, it syncronizes IO on IA64/Altix systems */
2873         mmiowb();
2874 }
2875
2876 /**
2877  * 82547 workaround to avoid controller hang in half-duplex environment.
2878  * The workaround is to avoid queuing a large packet that would span
2879  * the internal Tx FIFO ring boundary by notifying the stack to resend
2880  * the packet at a later time.  This gives the Tx FIFO an opportunity to
2881  * flush all packets.  When that occurs, we reset the Tx FIFO pointers
2882  * to the beginning of the Tx FIFO.
2883  **/
2884
2885 #define E1000_FIFO_HDR                  0x10
2886 #define E1000_82547_PAD_LEN             0x3E0
2887
2888 static int e1000_82547_fifo_workaround(struct e1000_adapter *adapter,
2889                                        struct sk_buff *skb)
2890 {
2891         u32 fifo_space = adapter->tx_fifo_size - adapter->tx_fifo_head;
2892         u32 skb_fifo_len = skb->len + E1000_FIFO_HDR;
2893
2894         skb_fifo_len = ALIGN(skb_fifo_len, E1000_FIFO_HDR);
2895
2896         if (adapter->link_duplex != HALF_DUPLEX)
2897                 goto no_fifo_stall_required;
2898
2899         if (atomic_read(&adapter->tx_fifo_stall))
2900                 return 1;
2901
2902         if (skb_fifo_len >= (E1000_82547_PAD_LEN + fifo_space)) {
2903                 atomic_set(&adapter->tx_fifo_stall, 1);
2904                 return 1;
2905         }
2906
2907 no_fifo_stall_required:
2908         adapter->tx_fifo_head += skb_fifo_len;
2909         if (adapter->tx_fifo_head >= adapter->tx_fifo_size)
2910                 adapter->tx_fifo_head -= adapter->tx_fifo_size;
2911         return 0;
2912 }
2913
2914 static int __e1000_maybe_stop_tx(struct net_device *netdev, int size)
2915 {
2916         struct e1000_adapter *adapter = netdev_priv(netdev);
2917         struct e1000_tx_ring *tx_ring = adapter->tx_ring;
2918
2919         netif_stop_queue(netdev);
2920         /* Herbert's original patch had:
2921          *  smp_mb__after_netif_stop_queue();
2922          * but since that doesn't exist yet, just open code it. */
2923         smp_mb();
2924
2925         /* We need to check again in a case another CPU has just
2926          * made room available. */
2927         if (likely(E1000_DESC_UNUSED(tx_ring) < size))
2928                 return -EBUSY;
2929
2930         /* A reprieve! */
2931         netif_start_queue(netdev);
2932         ++adapter->restart_queue;
2933         return 0;
2934 }
2935
2936 static int e1000_maybe_stop_tx(struct net_device *netdev,
2937                                struct e1000_tx_ring *tx_ring, int size)
2938 {
2939         if (likely(E1000_DESC_UNUSED(tx_ring) >= size))
2940                 return 0;
2941         return __e1000_maybe_stop_tx(netdev, size);
2942 }
2943
2944 #define TXD_USE_COUNT(S, X) (((S) >> (X)) + 1 )
2945 static netdev_tx_t e1000_xmit_frame(struct sk_buff *skb,
2946                                     struct net_device *netdev)
2947 {
2948         struct e1000_adapter *adapter = netdev_priv(netdev);
2949         struct e1000_hw *hw = &adapter->hw;
2950         struct e1000_tx_ring *tx_ring;
2951         unsigned int first, max_per_txd = E1000_MAX_DATA_PER_TXD;
2952         unsigned int max_txd_pwr = E1000_MAX_TXD_PWR;
2953         unsigned int tx_flags = 0;
2954         unsigned int len = skb_headlen(skb);
2955         unsigned int nr_frags;
2956         unsigned int mss;
2957         int count = 0;
2958         int tso;
2959         unsigned int f;
2960
2961         /* This goes back to the question of how to logically map a tx queue
2962          * to a flow.  Right now, performance is impacted slightly negatively
2963          * if using multiple tx queues.  If the stack breaks away from a
2964          * single qdisc implementation, we can look at this again. */
2965         tx_ring = adapter->tx_ring;
2966
2967         if (unlikely(skb->len <= 0)) {
2968                 dev_kfree_skb_any(skb);
2969                 return NETDEV_TX_OK;
2970         }
2971
2972         mss = skb_shinfo(skb)->gso_size;
2973         /* The controller does a simple calculation to
2974          * make sure there is enough room in the FIFO before
2975          * initiating the DMA for each buffer.  The calc is:
2976          * 4 = ceil(buffer len/mss).  To make sure we don't
2977          * overrun the FIFO, adjust the max buffer len if mss
2978          * drops. */
2979         if (mss) {
2980                 u8 hdr_len;
2981                 max_per_txd = min(mss << 2, max_per_txd);
2982                 max_txd_pwr = fls(max_per_txd) - 1;
2983
2984                 hdr_len = skb_transport_offset(skb) + tcp_hdrlen(skb);
2985                 if (skb->data_len && hdr_len == len) {
2986                         switch (hw->mac_type) {
2987                                 unsigned int pull_size;
2988                         case e1000_82544:
2989                                 /* Make sure we have room to chop off 4 bytes,
2990                                  * and that the end alignment will work out to
2991                                  * this hardware's requirements
2992                                  * NOTE: this is a TSO only workaround
2993                                  * if end byte alignment not correct move us
2994                                  * into the next dword */
2995                                 if ((unsigned long)(skb_tail_pointer(skb) - 1) & 4)
2996                                         break;
2997                                 /* fall through */
2998                                 pull_size = min((unsigned int)4, skb->data_len);
2999                                 if (!__pskb_pull_tail(skb, pull_size)) {
3000                                         e_err(drv, "__pskb_pull_tail "
3001                                               "failed.\n");
3002                                         dev_kfree_skb_any(skb);
3003                                         return NETDEV_TX_OK;
3004                                 }
3005                                 len = skb_headlen(skb);
3006                                 break;
3007                         default:
3008                                 /* do nothing */
3009                                 break;
3010                         }
3011                 }
3012         }
3013
3014         /* reserve a descriptor for the offload context */
3015         if ((mss) || (skb->ip_summed == CHECKSUM_PARTIAL))
3016                 count++;
3017         count++;
3018
3019         /* Controller Erratum workaround */
3020         if (!skb->data_len && tx_ring->last_tx_tso && !skb_is_gso(skb))
3021                 count++;
3022
3023         count += TXD_USE_COUNT(len, max_txd_pwr);
3024
3025         if (adapter->pcix_82544)
3026                 count++;
3027
3028         /* work-around for errata 10 and it applies to all controllers
3029          * in PCI-X mode, so add one more descriptor to the count
3030          */
3031         if (unlikely((hw->bus_type == e1000_bus_type_pcix) &&
3032                         (len > 2015)))
3033                 count++;
3034
3035         nr_frags = skb_shinfo(skb)->nr_frags;
3036         for (f = 0; f < nr_frags; f++)
3037                 count += TXD_USE_COUNT(skb_shinfo(skb)->frags[f].size,
3038                                        max_txd_pwr);
3039         if (adapter->pcix_82544)
3040                 count += nr_frags;
3041
3042         /* need: count + 2 desc gap to keep tail from touching
3043          * head, otherwise try next time */
3044         if (unlikely(e1000_maybe_stop_tx(netdev, tx_ring, count + 2)))
3045                 return NETDEV_TX_BUSY;
3046
3047         if (unlikely(hw->mac_type == e1000_82547)) {
3048                 if (unlikely(e1000_82547_fifo_workaround(adapter, skb))) {
3049                         netif_stop_queue(netdev);
3050                         if (!test_bit(__E1000_DOWN, &adapter->flags))
3051                                 mod_timer(&adapter->tx_fifo_stall_timer,
3052                                           jiffies + 1);
3053                         return NETDEV_TX_BUSY;
3054                 }
3055         }
3056
3057         if (unlikely(adapter->vlgrp && vlan_tx_tag_present(skb))) {
3058                 tx_flags |= E1000_TX_FLAGS_VLAN;
3059                 tx_flags |= (vlan_tx_tag_get(skb) << E1000_TX_FLAGS_VLAN_SHIFT);
3060         }
3061
3062         first = tx_ring->next_to_use;
3063
3064         tso = e1000_tso(adapter, tx_ring, skb);
3065         if (tso < 0) {
3066                 dev_kfree_skb_any(skb);
3067                 return NETDEV_TX_OK;
3068         }
3069
3070         if (likely(tso)) {
3071                 if (likely(hw->mac_type != e1000_82544))
3072                         tx_ring->last_tx_tso = 1;
3073                 tx_flags |= E1000_TX_FLAGS_TSO;
3074         } else if (likely(e1000_tx_csum(adapter, tx_ring, skb)))
3075                 tx_flags |= E1000_TX_FLAGS_CSUM;
3076
3077         if (likely(skb->protocol == htons(ETH_P_IP)))
3078                 tx_flags |= E1000_TX_FLAGS_IPV4;
3079
3080         count = e1000_tx_map(adapter, tx_ring, skb, first, max_per_txd,
3081                              nr_frags, mss);
3082
3083         if (count) {
3084                 e1000_tx_queue(adapter, tx_ring, tx_flags, count);
3085                 /* Make sure there is space in the ring for the next send. */
3086                 e1000_maybe_stop_tx(netdev, tx_ring, MAX_SKB_FRAGS + 2);
3087
3088         } else {
3089                 dev_kfree_skb_any(skb);
3090                 tx_ring->buffer_info[first].time_stamp = 0;
3091                 tx_ring->next_to_use = first;
3092         }
3093
3094         return NETDEV_TX_OK;
3095 }
3096
3097 /**
3098  * e1000_tx_timeout - Respond to a Tx Hang
3099  * @netdev: network interface device structure
3100  **/
3101
3102 static void e1000_tx_timeout(struct net_device *netdev)
3103 {
3104         struct e1000_adapter *adapter = netdev_priv(netdev);
3105
3106         /* Do the reset outside of interrupt context */
3107         adapter->tx_timeout_count++;
3108         schedule_work(&adapter->reset_task);
3109 }
3110
3111 static void e1000_reset_task(struct work_struct *work)
3112 {
3113         struct e1000_adapter *adapter =
3114                 container_of(work, struct e1000_adapter, reset_task);
3115
3116         e1000_reinit_locked(adapter);
3117 }
3118
3119 /**
3120  * e1000_get_stats - Get System Network Statistics
3121  * @netdev: network interface device structure
3122  *
3123  * Returns the address of the device statistics structure.
3124  * The statistics are actually updated from the timer callback.
3125  **/
3126
3127 static struct net_device_stats *e1000_get_stats(struct net_device *netdev)
3128 {
3129         /* only return the current stats */
3130         return &netdev->stats;
3131 }
3132
3133 /**
3134  * e1000_change_mtu - Change the Maximum Transfer Unit
3135  * @netdev: network interface device structure
3136  * @new_mtu: new value for maximum frame size
3137  *
3138  * Returns 0 on success, negative on failure
3139  **/
3140
3141 static int e1000_change_mtu(struct net_device *netdev, int new_mtu)
3142 {
3143         struct e1000_adapter *adapter = netdev_priv(netdev);
3144         struct e1000_hw *hw = &adapter->hw;
3145         int max_frame = new_mtu + ENET_HEADER_SIZE + ETHERNET_FCS_SIZE;
3146
3147         if ((max_frame < MINIMUM_ETHERNET_FRAME_SIZE) ||
3148             (max_frame > MAX_JUMBO_FRAME_SIZE)) {
3149                 e_err(probe, "Invalid MTU setting\n");
3150                 return -EINVAL;
3151         }
3152
3153         /* Adapter-specific max frame size limits. */
3154         switch (hw->mac_type) {
3155         case e1000_undefined ... e1000_82542_rev2_1:
3156                 if (max_frame > (ETH_FRAME_LEN + ETH_FCS_LEN)) {
3157                         e_err(probe, "Jumbo Frames not supported.\n");
3158                         return -EINVAL;
3159                 }
3160                 break;
3161         default:
3162                 /* Capable of supporting up to MAX_JUMBO_FRAME_SIZE limit. */
3163                 break;
3164         }
3165
3166         while (test_and_set_bit(__E1000_RESETTING, &adapter->flags))
3167                 msleep(1);
3168         /* e1000_down has a dependency on max_frame_size */
3169         hw->max_frame_size = max_frame;
3170         if (netif_running(netdev))
3171                 e1000_down(adapter);
3172
3173         /* NOTE: netdev_alloc_skb reserves 16 bytes, and typically NET_IP_ALIGN
3174          * means we reserve 2 more, this pushes us to allocate from the next
3175          * larger slab size.
3176          * i.e. RXBUFFER_2048 --> size-4096 slab
3177          *  however with the new *_jumbo_rx* routines, jumbo receives will use
3178          *  fragmented skbs */
3179
3180         if (max_frame <= E1000_RXBUFFER_2048)
3181                 adapter->rx_buffer_len = E1000_RXBUFFER_2048;
3182         else
3183 #if (PAGE_SIZE >= E1000_RXBUFFER_16384)
3184                 adapter->rx_buffer_len = E1000_RXBUFFER_16384;
3185 #elif (PAGE_SIZE >= E1000_RXBUFFER_4096)
3186                 adapter->rx_buffer_len = PAGE_SIZE;
3187 #endif
3188
3189         /* adjust allocation if LPE protects us, and we aren't using SBP */
3190         if (!hw->tbi_compatibility_on &&
3191             ((max_frame == (ETH_FRAME_LEN + ETH_FCS_LEN)) ||
3192              (max_frame == MAXIMUM_ETHERNET_VLAN_SIZE)))
3193                 adapter->rx_buffer_len = MAXIMUM_ETHERNET_VLAN_SIZE;
3194
3195         pr_info("%s changing MTU from %d to %d\n",
3196                 netdev->name, netdev->mtu, new_mtu);
3197         netdev->mtu = new_mtu;
3198
3199         if (netif_running(netdev))
3200                 e1000_up(adapter);
3201         else
3202                 e1000_reset(adapter);
3203
3204         clear_bit(__E1000_RESETTING, &adapter->flags);
3205
3206         return 0;
3207 }
3208
3209 /**
3210  * e1000_update_stats - Update the board statistics counters
3211  * @adapter: board private structure
3212  **/
3213
3214 void e1000_update_stats(struct e1000_adapter *adapter)
3215 {
3216         struct net_device *netdev = adapter->netdev;
3217         struct e1000_hw *hw = &adapter->hw;
3218         struct pci_dev *pdev = adapter->pdev;
3219         unsigned long flags;
3220         u16 phy_tmp;
3221
3222 #define PHY_IDLE_ERROR_COUNT_MASK 0x00FF
3223
3224         /*
3225          * Prevent stats update while adapter is being reset, or if the pci
3226          * connection is down.
3227          */
3228         if (adapter->link_speed == 0)
3229                 return;
3230         if (pci_channel_offline(pdev))
3231                 return;
3232
3233         spin_lock_irqsave(&adapter->stats_lock, flags);
3234
3235         /* these counters are modified from e1000_tbi_adjust_stats,
3236          * called from the interrupt context, so they must only
3237          * be written while holding adapter->stats_lock
3238          */
3239
3240         adapter->stats.crcerrs += er32(CRCERRS);
3241         adapter->stats.gprc += er32(GPRC);
3242         adapter->stats.gorcl += er32(GORCL);
3243         adapter->stats.gorch += er32(GORCH);
3244         adapter->stats.bprc += er32(BPRC);
3245         adapter->stats.mprc += er32(MPRC);
3246         adapter->stats.roc += er32(ROC);
3247
3248         adapter->stats.prc64 += er32(PRC64);
3249         adapter->stats.prc127 += er32(PRC127);
3250         adapter->stats.prc255 += er32(PRC255);
3251         adapter->stats.prc511 += er32(PRC511);
3252         adapter->stats.prc1023 += er32(PRC1023);
3253         adapter->stats.prc1522 += er32(PRC1522);
3254
3255         adapter->stats.symerrs += er32(SYMERRS);
3256         adapter->stats.mpc += er32(MPC);
3257         adapter->stats.scc += er32(SCC);
3258         adapter->stats.ecol += er32(ECOL);
3259         adapter->stats.mcc += er32(MCC);
3260         adapter->stats.latecol += er32(LATECOL);
3261         adapter->stats.dc += er32(DC);
3262         adapter->stats.sec += er32(SEC);
3263         adapter->stats.rlec += er32(RLEC);
3264         adapter->stats.xonrxc += er32(XONRXC);
3265         adapter->stats.xontxc += er32(XONTXC);
3266         adapter->stats.xoffrxc += er32(XOFFRXC);
3267         adapter->stats.xofftxc += er32(XOFFTXC);
3268         adapter->stats.fcruc += er32(FCRUC);
3269         adapter->stats.gptc += er32(GPTC);
3270         adapter->stats.gotcl += er32(GOTCL);
3271         adapter->stats.gotch += er32(GOTCH);
3272         adapter->stats.rnbc += er32(RNBC);
3273         adapter->stats.ruc += er32(RUC);
3274         adapter->stats.rfc += er32(RFC);
3275         adapter->stats.rjc += er32(RJC);
3276         adapter->stats.torl += er32(TORL);
3277         adapter->stats.torh += er32(TORH);
3278         adapter->stats.totl += er32(TOTL);
3279         adapter->stats.toth += er32(TOTH);
3280         adapter->stats.tpr += er32(TPR);
3281
3282         adapter->stats.ptc64 += er32(PTC64);
3283         adapter->stats.ptc127 += er32(PTC127);
3284         adapter->stats.ptc255 += er32(PTC255);
3285         adapter->stats.ptc511 += er32(PTC511);
3286         adapter->stats.ptc1023 += er32(PTC1023);
3287         adapter->stats.ptc1522 += er32(PTC1522);
3288
3289         adapter->stats.mptc += er32(MPTC);
3290         adapter->stats.bptc += er32(BPTC);
3291
3292         /* used for adaptive IFS */
3293
3294         hw->tx_packet_delta = er32(TPT);
3295         adapter->stats.tpt += hw->tx_packet_delta;
3296         hw->collision_delta = er32(COLC);
3297         adapter->stats.colc += hw->collision_delta;
3298
3299         if (hw->mac_type >= e1000_82543) {
3300                 adapter->stats.algnerrc += er32(ALGNERRC);
3301                 adapter->stats.rxerrc += er32(RXERRC);
3302                 adapter->stats.tncrs += er32(TNCRS);
3303                 adapter->stats.cexterr += er32(CEXTERR);
3304                 adapter->stats.tsctc += er32(TSCTC);
3305                 adapter->stats.tsctfc += er32(TSCTFC);
3306         }
3307
3308         /* Fill out the OS statistics structure */
3309         netdev->stats.multicast = adapter->stats.mprc;
3310         netdev->stats.collisions = adapter->stats.colc;
3311
3312         /* Rx Errors */
3313
3314         /* RLEC on some newer hardware can be incorrect so build
3315         * our own version based on RUC and ROC */
3316         netdev->stats.rx_errors = adapter->stats.rxerrc +
3317                 adapter->stats.crcerrs + adapter->stats.algnerrc +
3318                 adapter->stats.ruc + adapter->stats.roc +
3319                 adapter->stats.cexterr;
3320         adapter->stats.rlerrc = adapter->stats.ruc + adapter->stats.roc;
3321         netdev->stats.rx_length_errors = adapter->stats.rlerrc;
3322         netdev->stats.rx_crc_errors = adapter->stats.crcerrs;
3323         netdev->stats.rx_frame_errors = adapter->stats.algnerrc;
3324         netdev->stats.rx_missed_errors = adapter->stats.mpc;
3325
3326         /* Tx Errors */
3327         adapter->stats.txerrc = adapter->stats.ecol + adapter->stats.latecol;
3328         netdev->stats.tx_errors = adapter->stats.txerrc;
3329         netdev->stats.tx_aborted_errors = adapter->stats.ecol;
3330         netdev->stats.tx_window_errors = adapter->stats.latecol;
3331         netdev->stats.tx_carrier_errors = adapter->stats.tncrs;
3332         if (hw->bad_tx_carr_stats_fd &&
3333             adapter->link_duplex == FULL_DUPLEX) {
3334                 netdev->stats.tx_carrier_errors = 0;
3335                 adapter->stats.tncrs = 0;
3336         }
3337
3338         /* Tx Dropped needs to be maintained elsewhere */
3339
3340         /* Phy Stats */
3341         if (hw->media_type == e1000_media_type_copper) {
3342                 if ((adapter->link_speed == SPEED_1000) &&
3343                    (!e1000_read_phy_reg(hw, PHY_1000T_STATUS, &phy_tmp))) {
3344                         phy_tmp &= PHY_IDLE_ERROR_COUNT_MASK;
3345                         adapter->phy_stats.idle_errors += phy_tmp;
3346                 }
3347
3348                 if ((hw->mac_type <= e1000_82546) &&
3349                    (hw->phy_type == e1000_phy_m88) &&
3350                    !e1000_read_phy_reg(hw, M88E1000_RX_ERR_CNTR, &phy_tmp))
3351                         adapter->phy_stats.receive_errors += phy_tmp;
3352         }
3353
3354         /* Management Stats */
3355         if (hw->has_smbus) {
3356                 adapter->stats.mgptc += er32(MGTPTC);
3357                 adapter->stats.mgprc += er32(MGTPRC);
3358                 adapter->stats.mgpdc += er32(MGTPDC);
3359         }
3360
3361         spin_unlock_irqrestore(&adapter->stats_lock, flags);
3362 }
3363
3364 /**
3365  * e1000_intr - Interrupt Handler
3366  * @irq: interrupt number
3367  * @data: pointer to a network interface device structure
3368  **/
3369
3370 static irqreturn_t e1000_intr(int irq, void *data)
3371 {
3372         struct net_device *netdev = data;
3373         struct e1000_adapter *adapter = netdev_priv(netdev);
3374         struct e1000_hw *hw = &adapter->hw;
3375         u32 icr = er32(ICR);
3376
3377         if (unlikely((!icr) || test_bit(__E1000_DOWN, &adapter->flags)))
3378                 return IRQ_NONE;  /* Not our interrupt */
3379
3380         if (unlikely(icr & (E1000_ICR_RXSEQ | E1000_ICR_LSC))) {
3381                 hw->get_link_status = 1;
3382                 /* guard against interrupt when we're going down */
3383                 if (!test_bit(__E1000_DOWN, &adapter->flags))
3384                         mod_timer(&adapter->watchdog_timer, jiffies + 1);
3385         }
3386
3387         /* disable interrupts, without the synchronize_irq bit */
3388         ew32(IMC, ~0);
3389         E1000_WRITE_FLUSH();
3390
3391         if (likely(napi_schedule_prep(&adapter->napi))) {
3392                 adapter->total_tx_bytes = 0;
3393                 adapter->total_tx_packets = 0;
3394                 adapter->total_rx_bytes = 0;
3395                 adapter->total_rx_packets = 0;
3396                 __napi_schedule(&adapter->napi);
3397         } else {
3398                 /* this really should not happen! if it does it is basically a
3399                  * bug, but not a hard error, so enable ints and continue */
3400                 if (!test_bit(__E1000_DOWN, &adapter->flags))
3401                         e1000_irq_enable(adapter);
3402         }
3403
3404         return IRQ_HANDLED;
3405 }
3406
3407 /**
3408  * e1000_clean - NAPI Rx polling callback
3409  * @adapter: board private structure
3410  **/
3411 static int e1000_clean(struct napi_struct *napi, int budget)
3412 {
3413         struct e1000_adapter *adapter = container_of(napi, struct e1000_adapter, napi);
3414         int tx_clean_complete = 0, work_done = 0;
3415
3416         tx_clean_complete = e1000_clean_tx_irq(adapter, &adapter->tx_ring[0]);
3417
3418         adapter->clean_rx(adapter, &adapter->rx_ring[0], &work_done, budget);
3419
3420         if (!tx_clean_complete)
3421                 work_done = budget;
3422
3423         /* If budget not fully consumed, exit the polling mode */
3424         if (work_done < budget) {
3425                 if (likely(adapter->itr_setting & 3))
3426                         e1000_set_itr(adapter);
3427                 napi_complete(napi);
3428                 if (!test_bit(__E1000_DOWN, &adapter->flags))
3429                         e1000_irq_enable(adapter);
3430         }
3431
3432         return work_done;
3433 }
3434
3435 /**
3436  * e1000_clean_tx_irq - Reclaim resources after transmit completes
3437  * @adapter: board private structure
3438  **/
3439 static bool e1000_clean_tx_irq(struct e1000_adapter *adapter,
3440                                struct e1000_tx_ring *tx_ring)
3441 {
3442         struct e1000_hw *hw = &adapter->hw;
3443         struct net_device *netdev = adapter->netdev;
3444         struct e1000_tx_desc *tx_desc, *eop_desc;
3445         struct e1000_buffer *buffer_info;
3446         unsigned int i, eop;
3447         unsigned int count = 0;
3448         unsigned int total_tx_bytes=0, total_tx_packets=0;
3449
3450         i = tx_ring->next_to_clean;
3451         eop = tx_ring->buffer_info[i].next_to_watch;
3452         eop_desc = E1000_TX_DESC(*tx_ring, eop);
3453
3454         while ((eop_desc->upper.data & cpu_to_le32(E1000_TXD_STAT_DD)) &&
3455                (count < tx_ring->count)) {
3456                 bool cleaned = false;
3457                 for ( ; !cleaned; count++) {
3458                         tx_desc = E1000_TX_DESC(*tx_ring, i);
3459                         buffer_info = &tx_ring->buffer_info[i];
3460                         cleaned = (i == eop);
3461
3462                         if (cleaned) {
3463                                 struct sk_buff *skb = buffer_info->skb;
3464                                 unsigned int segs, bytecount;
3465                                 segs = skb_shinfo(skb)->gso_segs ?: 1;
3466                                 /* multiply data chunks by size of headers */
3467                                 bytecount = ((segs - 1) * skb_headlen(skb)) +
3468                                             skb->len;
3469                                 total_tx_packets += segs;
3470                                 total_tx_bytes += bytecount;
3471                         }
3472                         e1000_unmap_and_free_tx_resource(adapter, buffer_info);
3473                         tx_desc->upper.data = 0;
3474
3475                         if (unlikely(++i == tx_ring->count)) i = 0;
3476                 }
3477
3478                 eop = tx_ring->buffer_info[i].next_to_watch;
3479                 eop_desc = E1000_TX_DESC(*tx_ring, eop);
3480         }
3481
3482         tx_ring->next_to_clean = i;
3483
3484 #define TX_WAKE_THRESHOLD 32
3485         if (unlikely(count && netif_carrier_ok(netdev) &&
3486                      E1000_DESC_UNUSED(tx_ring) >= TX_WAKE_THRESHOLD)) {
3487                 /* Make sure that anybody stopping the queue after this
3488                  * sees the new next_to_clean.
3489                  */
3490                 smp_mb();
3491
3492                 if (netif_queue_stopped(netdev) &&
3493                     !(test_bit(__E1000_DOWN, &adapter->flags))) {
3494                         netif_wake_queue(netdev);
3495                         ++adapter->restart_queue;
3496                 }
3497         }
3498
3499         if (adapter->detect_tx_hung) {
3500                 /* Detect a transmit hang in hardware, this serializes the
3501                  * check with the clearing of time_stamp and movement of i */
3502                 adapter->detect_tx_hung = false;
3503                 if (tx_ring->buffer_info[eop].time_stamp &&
3504                     time_after(jiffies, tx_ring->buffer_info[eop].time_stamp +
3505                                (adapter->tx_timeout_factor * HZ)) &&
3506                     !(er32(STATUS) & E1000_STATUS_TXOFF)) {
3507
3508                         /* detected Tx unit hang */
3509                         e_err(drv, "Detected Tx Unit Hang\n"
3510                               "  Tx Queue             <%lu>\n"
3511                               "  TDH                  <%x>\n"
3512                               "  TDT                  <%x>\n"
3513                               "  next_to_use          <%x>\n"
3514                               "  next_to_clean        <%x>\n"
3515                               "buffer_info[next_to_clean]\n"
3516                               "  time_stamp           <%lx>\n"
3517                               "  next_to_watch        <%x>\n"
3518                               "  jiffies              <%lx>\n"
3519                               "  next_to_watch.status <%x>\n",
3520                                 (unsigned long)((tx_ring - adapter->tx_ring) /
3521                                         sizeof(struct e1000_tx_ring)),
3522                                 readl(hw->hw_addr + tx_ring->tdh),
3523                                 readl(hw->hw_addr + tx_ring->tdt),
3524                                 tx_ring->next_to_use,
3525                                 tx_ring->next_to_clean,
3526                                 tx_ring->buffer_info[eop].time_stamp,
3527                                 eop,
3528                                 jiffies,
3529                                 eop_desc->upper.fields.status);
3530                         netif_stop_queue(netdev);
3531                 }
3532         }
3533         adapter->total_tx_bytes += total_tx_bytes;
3534         adapter->total_tx_packets += total_tx_packets;
3535         netdev->stats.tx_bytes += total_tx_bytes;
3536         netdev->stats.tx_packets += total_tx_packets;
3537         return (count < tx_ring->count);
3538 }
3539
3540 /**
3541  * e1000_rx_checksum - Receive Checksum Offload for 82543
3542  * @adapter:     board private structure
3543  * @status_err:  receive descriptor status and error fields
3544  * @csum:        receive descriptor csum field
3545  * @sk_buff:     socket buffer with received data
3546  **/
3547
3548 static void e1000_rx_checksum(struct e1000_adapter *adapter, u32 status_err,
3549                               u32 csum, struct sk_buff *skb)
3550 {
3551         struct e1000_hw *hw = &adapter->hw;
3552         u16 status = (u16)status_err;
3553         u8 errors = (u8)(status_err >> 24);
3554         skb->ip_summed = CHECKSUM_NONE;
3555
3556         /* 82543 or newer only */
3557         if (unlikely(hw->mac_type < e1000_82543)) return;
3558         /* Ignore Checksum bit is set */
3559         if (unlikely(status & E1000_RXD_STAT_IXSM)) return;
3560         /* TCP/UDP checksum error bit is set */
3561         if (unlikely(errors & E1000_RXD_ERR_TCPE)) {
3562                 /* let the stack verify checksum errors */
3563                 adapter->hw_csum_err++;
3564                 return;
3565         }
3566         /* TCP/UDP Checksum has not been calculated */
3567         if (!(status & E1000_RXD_STAT_TCPCS))
3568                 return;
3569
3570         /* It must be a TCP or UDP packet with a valid checksum */
3571         if (likely(status & E1000_RXD_STAT_TCPCS)) {
3572                 /* TCP checksum is good */
3573                 skb->ip_summed = CHECKSUM_UNNECESSARY;
3574         }
3575         adapter->hw_csum_good++;
3576 }
3577
3578 /**
3579  * e1000_consume_page - helper function
3580  **/
3581 static void e1000_consume_page(struct e1000_buffer *bi, struct sk_buff *skb,
3582                                u16 length)
3583 {
3584         bi->page = NULL;
3585         skb->len += length;
3586         skb->data_len += length;
3587         skb->truesize += length;
3588 }
3589
3590 /**
3591  * e1000_receive_skb - helper function to handle rx indications
3592  * @adapter: board private structure
3593  * @status: descriptor status field as written by hardware
3594  * @vlan: descriptor vlan field as written by hardware (no le/be conversion)
3595  * @skb: pointer to sk_buff to be indicated to stack
3596  */
3597 static void e1000_receive_skb(struct e1000_adapter *adapter, u8 status,
3598                               __le16 vlan, struct sk_buff *skb)
3599 {
3600         if (unlikely(adapter->vlgrp && (status & E1000_RXD_STAT_VP))) {
3601                 vlan_hwaccel_receive_skb(skb, adapter->vlgrp,
3602                                          le16_to_cpu(vlan) &
3603                                          E1000_RXD_SPC_VLAN_MASK);
3604         } else {
3605                 netif_receive_skb(skb);
3606         }
3607 }
3608
3609 /**
3610  * e1000_clean_jumbo_rx_irq - Send received data up the network stack; legacy
3611  * @adapter: board private structure
3612  * @rx_ring: ring to clean
3613  * @work_done: amount of napi work completed this call
3614  * @work_to_do: max amount of work allowed for this call to do
3615  *
3616  * the return value indicates whether actual cleaning was done, there
3617  * is no guarantee that everything was cleaned
3618  */
3619 static bool e1000_clean_jumbo_rx_irq(struct e1000_adapter *adapter,
3620                                      struct e1000_rx_ring *rx_ring,
3621                                      int *work_done, int work_to_do)
3622 {
3623         struct e1000_hw *hw = &adapter->hw;
3624         struct net_device *netdev = adapter->netdev;
3625         struct pci_dev *pdev = adapter->pdev;
3626         struct e1000_rx_desc *rx_desc, *next_rxd;
3627         struct e1000_buffer *buffer_info, *next_buffer;
3628         unsigned long irq_flags;
3629         u32 length;
3630         unsigned int i;
3631         int cleaned_count = 0;
3632         bool cleaned = false;
3633         unsigned int total_rx_bytes=0, total_rx_packets=0;
3634
3635         i = rx_ring->next_to_clean;
3636         rx_desc = E1000_RX_DESC(*rx_ring, i);
3637         buffer_info = &rx_ring->buffer_info[i];
3638
3639         while (rx_desc->status & E1000_RXD_STAT_DD) {
3640                 struct sk_buff *skb;
3641                 u8 status;
3642
3643                 if (*work_done >= work_to_do)
3644                         break;
3645                 (*work_done)++;
3646
3647                 status = rx_desc->status;
3648                 skb = buffer_info->skb;
3649                 buffer_info->skb = NULL;
3650
3651                 if (++i == rx_ring->count) i = 0;
3652                 next_rxd = E1000_RX_DESC(*rx_ring, i);
3653                 prefetch(next_rxd);
3654
3655                 next_buffer = &rx_ring->buffer_info[i];
3656
3657                 cleaned = true;
3658                 cleaned_count++;
3659                 dma_unmap_page(&pdev->dev, buffer_info->dma,
3660                                buffer_info->length, DMA_FROM_DEVICE);
3661                 buffer_info->dma = 0;
3662
3663                 length = le16_to_cpu(rx_desc->length);
3664
3665                 /* errors is only valid for DD + EOP descriptors */
3666                 if (unlikely((status & E1000_RXD_STAT_EOP) &&
3667                     (rx_desc->errors & E1000_RXD_ERR_FRAME_ERR_MASK))) {
3668                         u8 last_byte = *(skb->data + length - 1);
3669                         if (TBI_ACCEPT(hw, status, rx_desc->errors, length,
3670                                        last_byte)) {
3671                                 spin_lock_irqsave(&adapter->stats_lock,
3672                                                   irq_flags);
3673                                 e1000_tbi_adjust_stats(hw, &adapter->stats,
3674                                                        length, skb->data);
3675                                 spin_unlock_irqrestore(&adapter->stats_lock,
3676                                                        irq_flags);
3677                                 length--;
3678                         } else {
3679                                 /* recycle both page and skb */
3680                                 buffer_info->skb = skb;
3681                                 /* an error means any chain goes out the window
3682                                  * too */
3683                                 if (rx_ring->rx_skb_top)
3684                                         dev_kfree_skb(rx_ring->rx_skb_top);
3685                                 rx_ring->rx_skb_top = NULL;
3686                                 goto next_desc;
3687                         }
3688                 }
3689
3690 #define rxtop rx_ring->rx_skb_top
3691                 if (!(status & E1000_RXD_STAT_EOP)) {
3692                         /* this descriptor is only the beginning (or middle) */
3693                         if (!rxtop) {
3694                                 /* this is the beginning of a chain */
3695                                 rxtop = skb;
3696                                 skb_fill_page_desc(rxtop, 0, buffer_info->page,
3697                                                    0, length);
3698                         } else {
3699                                 /* this is the middle of a chain */
3700                                 skb_fill_page_desc(rxtop,
3701                                     skb_shinfo(rxtop)->nr_frags,
3702                                     buffer_info->page, 0, length);
3703                                 /* re-use the skb, only consumed the page */
3704                                 buffer_info->skb = skb;
3705                         }
3706                         e1000_consume_page(buffer_info, rxtop, length);
3707                         goto next_desc;
3708                 } else {
3709                         if (rxtop) {
3710                                 /* end of the chain */
3711                                 skb_fill_page_desc(rxtop,
3712                                     skb_shinfo(rxtop)->nr_frags,
3713                                     buffer_info->page, 0, length);
3714                                 /* re-use the current skb, we only consumed the
3715                                  * page */
3716                                 buffer_info->skb = skb;
3717                                 skb = rxtop;
3718                                 rxtop = NULL;
3719                                 e1000_consume_page(buffer_info, skb, length);
3720                         } else {
3721                                 /* no chain, got EOP, this buf is the packet
3722                                  * copybreak to save the put_page/alloc_page */
3723                                 if (length <= copybreak &&
3724                                     skb_tailroom(skb) >= length) {
3725                                         u8 *vaddr;
3726                                         vaddr = kmap_atomic(buffer_info->page,
3727                                                             KM_SKB_DATA_SOFTIRQ);
3728                                         memcpy(skb_tail_pointer(skb), vaddr, length);
3729                                         kunmap_atomic(vaddr,
3730                                                       KM_SKB_DATA_SOFTIRQ);
3731                                         /* re-use the page, so don't erase
3732                                          * buffer_info->page */
3733                                         skb_put(skb, length);
3734                                 } else {
3735                                         skb_fill_page_desc(skb, 0,
3736                                                            buffer_info->page, 0,
3737                                                            length);
3738                                         e1000_consume_page(buffer_info, skb,
3739                                                            length);
3740                                 }
3741                         }
3742                 }
3743
3744                 /* Receive Checksum Offload XXX recompute due to CRC strip? */
3745                 e1000_rx_checksum(adapter,
3746                                   (u32)(status) |
3747                                   ((u32)(rx_desc->errors) << 24),
3748                                   le16_to_cpu(rx_desc->csum), skb);
3749
3750                 pskb_trim(skb, skb->len - 4);
3751
3752                 /* probably a little skewed due to removing CRC */
3753                 total_rx_bytes += skb->len;
3754                 total_rx_packets++;
3755
3756                 /* eth type trans needs skb->data to point to something */
3757                 if (!pskb_may_pull(skb, ETH_HLEN)) {
3758                         e_err(drv, "pskb_may_pull failed.\n");
3759                         dev_kfree_skb(skb);
3760                         goto next_desc;
3761                 }
3762
3763                 skb->protocol = eth_type_trans(skb, netdev);
3764
3765                 e1000_receive_skb(adapter, status, rx_desc->special, skb);
3766
3767 next_desc:
3768                 rx_desc->status = 0;
3769
3770                 /* return some buffers to hardware, one at a time is too slow */
3771                 if (unlikely(cleaned_count >= E1000_RX_BUFFER_WRITE)) {
3772                         adapter->alloc_rx_buf(adapter, rx_ring, cleaned_count);
3773                         cleaned_count = 0;
3774                 }
3775
3776                 /* use prefetched values */
3777                 rx_desc = next_rxd;
3778                 buffer_info = next_buffer;
3779         }
3780         rx_ring->next_to_clean = i;
3781
3782         cleaned_count = E1000_DESC_UNUSED(rx_ring);
3783         if (cleaned_count)
3784                 adapter->alloc_rx_buf(adapter, rx_ring, cleaned_count);
3785
3786         adapter->total_rx_packets += total_rx_packets;
3787         adapter->total_rx_bytes += total_rx_bytes;
3788         netdev->stats.rx_bytes += total_rx_bytes;
3789         netdev->stats.rx_packets += total_rx_packets;
3790         return cleaned;
3791 }
3792
3793 /*
3794  * this should improve performance for small packets with large amounts
3795  * of reassembly being done in the stack
3796  */
3797 static void e1000_check_copybreak(struct net_device *netdev,
3798                                  struct e1000_buffer *buffer_info,
3799                                  u32 length, struct sk_buff **skb)
3800 {
3801         struct sk_buff *new_skb;
3802
3803         if (length > copybreak)
3804                 return;
3805
3806         new_skb = netdev_alloc_skb_ip_align(netdev, length);
3807         if (!new_skb)
3808                 return;
3809
3810         skb_copy_to_linear_data_offset(new_skb, -NET_IP_ALIGN,
3811                                        (*skb)->data - NET_IP_ALIGN,
3812                                        length + NET_IP_ALIGN);
3813         /* save the skb in buffer_info as good */
3814         buffer_info->skb = *skb;
3815         *skb = new_skb;
3816 }
3817
3818 /**
3819  * e1000_clean_rx_irq - Send received data up the network stack; legacy
3820  * @adapter: board private structure
3821  * @rx_ring: ring to clean
3822  * @work_done: amount of napi work completed this call
3823  * @work_to_do: max amount of work allowed for this call to do
3824  */
3825 static bool e1000_clean_rx_irq(struct e1000_adapter *adapter,
3826                                struct e1000_rx_ring *rx_ring,
3827                                int *work_done, int work_to_do)
3828 {
3829         struct e1000_hw *hw = &adapter->hw;
3830         struct net_device *netdev = adapter->netdev;
3831         struct pci_dev *pdev = adapter->pdev;
3832         struct e1000_rx_desc *rx_desc, *next_rxd;
3833         struct e1000_buffer *buffer_info, *next_buffer;
3834         unsigned long flags;
3835         u32 length;
3836         unsigned int i;
3837         int cleaned_count = 0;
3838         bool cleaned = false;
3839         unsigned int total_rx_bytes=0, total_rx_packets=0;
3840
3841         i = rx_ring->next_to_clean;
3842         rx_desc = E1000_RX_DESC(*rx_ring, i);
3843         buffer_info = &rx_ring->buffer_info[i];
3844
3845         while (rx_desc->status & E1000_RXD_STAT_DD) {
3846                 struct sk_buff *skb;
3847                 u8 status;
3848
3849                 if (*work_done >= work_to_do)
3850                         break;
3851                 (*work_done)++;
3852
3853                 status = rx_desc->status;
3854                 skb = buffer_info->skb;
3855                 buffer_info->skb = NULL;
3856
3857                 prefetch(skb->data - NET_IP_ALIGN);
3858
3859                 if (++i == rx_ring->count) i = 0;
3860                 next_rxd = E1000_RX_DESC(*rx_ring, i);
3861                 prefetch(next_rxd);
3862
3863                 next_buffer = &rx_ring->buffer_info[i];
3864
3865                 cleaned = true;
3866                 cleaned_count++;
3867                 dma_unmap_single(&pdev->dev, buffer_info->dma,
3868                                  buffer_info->length, DMA_FROM_DEVICE);
3869                 buffer_info->dma = 0;
3870
3871                 length = le16_to_cpu(rx_desc->length);
3872                 /* !EOP means multiple descriptors were used to store a single
3873                  * packet, if thats the case we need to toss it.  In fact, we
3874                  * to toss every packet with the EOP bit clear and the next
3875                  * frame that _does_ have the EOP bit set, as it is by
3876                  * definition only a frame fragment
3877                  */
3878                 if (unlikely(!(status & E1000_RXD_STAT_EOP)))
3879                         adapter->discarding = true;
3880
3881                 if (adapter->discarding) {
3882                         /* All receives must fit into a single buffer */
3883                         e_dbg("Receive packet consumed multiple buffers\n");
3884                         /* recycle */
3885                         buffer_info->skb = skb;
3886                         if (status & E1000_RXD_STAT_EOP)
3887                                 adapter->discarding = false;
3888                         goto next_desc;
3889                 }
3890
3891                 if (unlikely(rx_desc->errors & E1000_RXD_ERR_FRAME_ERR_MASK)) {
3892                         u8 last_byte = *(skb->data + length - 1);
3893                         if (TBI_ACCEPT(hw, status, rx_desc->errors, length,
3894                                        last_byte)) {
3895                                 spin_lock_irqsave(&adapter->stats_lock, flags);
3896                                 e1000_tbi_adjust_stats(hw, &adapter->stats,
3897                                                        length, skb->data);
3898                                 spin_unlock_irqrestore(&adapter->stats_lock,
3899                                                        flags);
3900                                 length--;
3901                         } else {
3902                                 /* recycle */
3903                                 buffer_info->skb = skb;
3904                                 goto next_desc;
3905                         }
3906                 }
3907
3908                 /* adjust length to remove Ethernet CRC, this must be
3909                  * done after the TBI_ACCEPT workaround above */
3910                 length -= 4;
3911
3912                 /* probably a little skewed due to removing CRC */
3913                 total_rx_bytes += length;
3914                 total_rx_packets++;
3915
3916                 e1000_check_copybreak(netdev, buffer_info, length, &skb);
3917
3918                 skb_put(skb, length);
3919
3920                 /* Receive Checksum Offload */
3921                 e1000_rx_checksum(adapter,
3922                                   (u32)(status) |
3923                                   ((u32)(rx_desc->errors) << 24),
3924                                   le16_to_cpu(rx_desc->csum), skb);
3925
3926                 skb->protocol = eth_type_trans(skb, netdev);
3927
3928                 e1000_receive_skb(adapter, status, rx_desc->special, skb);
3929
3930 next_desc:
3931                 rx_desc->status = 0;
3932
3933                 /* return some buffers to hardware, one at a time is too slow */
3934                 if (unlikely(cleaned_count >= E1000_RX_BUFFER_WRITE)) {
3935                         adapter->alloc_rx_buf(adapter, rx_ring, cleaned_count);
3936                         cleaned_count = 0;
3937                 }
3938
3939                 /* use prefetched values */
3940                 rx_desc = next_rxd;
3941                 buffer_info = next_buffer;
3942         }
3943         rx_ring->next_to_clean = i;
3944
3945         cleaned_count = E1000_DESC_UNUSED(rx_ring);
3946         if (cleaned_count)
3947                 adapter->alloc_rx_buf(adapter, rx_ring, cleaned_count);
3948
3949         adapter->total_rx_packets += total_rx_packets;
3950         adapter->total_rx_bytes += total_rx_bytes;
3951         netdev->stats.rx_bytes += total_rx_bytes;
3952         netdev->stats.rx_packets += total_rx_packets;
3953         return cleaned;
3954 }
3955
3956 /**
3957  * e1000_alloc_jumbo_rx_buffers - Replace used jumbo receive buffers
3958  * @adapter: address of board private structure
3959  * @rx_ring: pointer to receive ring structure
3960  * @cleaned_count: number of buffers to allocate this pass
3961  **/
3962
3963 static void
3964 e1000_alloc_jumbo_rx_buffers(struct e1000_adapter *adapter,
3965                              struct e1000_rx_ring *rx_ring, int cleaned_count)
3966 {
3967         struct net_device *netdev = adapter->netdev;
3968         struct pci_dev *pdev = adapter->pdev;
3969         struct e1000_rx_desc *rx_desc;
3970         struct e1000_buffer *buffer_info;
3971         struct sk_buff *skb;
3972         unsigned int i;
3973         unsigned int bufsz = 256 - 16 /*for skb_reserve */ ;
3974
3975         i = rx_ring->next_to_use;
3976         buffer_info = &rx_ring->buffer_info[i];
3977
3978         while (cleaned_count--) {
3979                 skb = buffer_info->skb;
3980                 if (skb) {
3981                         skb_trim(skb, 0);
3982                         goto check_page;
3983                 }
3984
3985                 skb = netdev_alloc_skb_ip_align(netdev, bufsz);
3986                 if (unlikely(!skb)) {
3987                         /* Better luck next round */
3988                         adapter->alloc_rx_buff_failed++;
3989                         break;
3990                 }
3991
3992                 /* Fix for errata 23, can't cross 64kB boundary */
3993                 if (!e1000_check_64k_bound(adapter, skb->data, bufsz)) {
3994                         struct sk_buff *oldskb = skb;
3995                         e_err(rx_err, "skb align check failed: %u bytes at "
3996                               "%p\n", bufsz, skb->data);
3997                         /* Try again, without freeing the previous */
3998                         skb = netdev_alloc_skb_ip_align(netdev, bufsz);
3999                         /* Failed allocation, critical failure */
4000                         if (!skb) {
4001                                 dev_kfree_skb(oldskb);
4002                                 adapter->alloc_rx_buff_failed++;
4003                                 break;
4004                         }
4005
4006                         if (!e1000_check_64k_bound(adapter, skb->data, bufsz)) {
4007                                 /* give up */
4008                                 dev_kfree_skb(skb);
4009                                 dev_kfree_skb(oldskb);
4010                                 break; /* while (cleaned_count--) */
4011                         }
4012
4013                         /* Use new allocation */
4014                         dev_kfree_skb(oldskb);
4015                 }
4016                 buffer_info->skb = skb;
4017                 buffer_info->length = adapter->rx_buffer_len;
4018 check_page:
4019                 /* allocate a new page if necessary */
4020                 if (!buffer_info->page) {
4021                         buffer_info->page = alloc_page(GFP_ATOMIC);
4022                         if (unlikely(!buffer_info->page)) {
4023                                 adapter->alloc_rx_buff_failed++;
4024                                 break;
4025                         }
4026                 }
4027
4028                 if (!buffer_info->dma) {
4029                         buffer_info->dma = dma_map_page(&pdev->dev,
4030                                                         buffer_info->page, 0,
4031                                                         buffer_info->length,
4032                                                         DMA_FROM_DEVICE);
4033                         if (dma_mapping_error(&pdev->dev, buffer_info->dma)) {
4034                                 put_page(buffer_info->page);
4035                                 dev_kfree_skb(skb);
4036                                 buffer_info->page = NULL;
4037                                 buffer_info->skb = NULL;
4038                                 buffer_info->dma = 0;
4039                                 adapter->alloc_rx_buff_failed++;
4040                                 break; /* while !buffer_info->skb */
4041                         }
4042                 }
4043
4044                 rx_desc = E1000_RX_DESC(*rx_ring, i);
4045                 rx_desc->buffer_addr = cpu_to_le64(buffer_info->dma);
4046
4047                 if (unlikely(++i == rx_ring->count))
4048                         i = 0;
4049                 buffer_info = &rx_ring->buffer_info[i];
4050         }
4051
4052         if (likely(rx_ring->next_to_use != i)) {
4053                 rx_ring->next_to_use = i;
4054                 if (unlikely(i-- == 0))
4055                         i = (rx_ring->count - 1);
4056
4057                 /* Force memory writes to complete before letting h/w
4058                  * know there are new descriptors to fetch.  (Only
4059                  * applicable for weak-ordered memory model archs,
4060                  * such as IA-64). */
4061                 wmb();
4062                 writel(i, adapter->hw.hw_addr + rx_ring->rdt);
4063         }
4064 }
4065
4066 /**
4067  * e1000_alloc_rx_buffers - Replace used receive buffers; legacy & extended
4068  * @adapter: address of board private structure
4069  **/
4070
4071 static void e1000_alloc_rx_buffers(struct e1000_adapter *adapter,
4072                                    struct e1000_rx_ring *rx_ring,
4073                                    int cleaned_count)
4074 {
4075         struct e1000_hw *hw = &adapter->hw;
4076         struct net_device *netdev = adapter->netdev;
4077         struct pci_dev *pdev = adapter->pdev;
4078         struct e1000_rx_desc *rx_desc;
4079         struct e1000_buffer *buffer_info;
4080         struct sk_buff *skb;
4081         unsigned int i;
4082         unsigned int bufsz = adapter->rx_buffer_len;
4083
4084         i = rx_ring->next_to_use;
4085         buffer_info = &rx_ring->buffer_info[i];
4086
4087         while (cleaned_count--) {
4088                 skb = buffer_info->skb;
4089                 if (skb) {
4090                         skb_trim(skb, 0);
4091                         goto map_skb;
4092                 }
4093
4094                 skb = netdev_alloc_skb_ip_align(netdev, bufsz);
4095                 if (unlikely(!skb)) {
4096                         /* Better luck next round */
4097                         adapter->alloc_rx_buff_failed++;
4098                         break;
4099                 }
4100
4101                 /* Fix for errata 23, can't cross 64kB boundary */
4102                 if (!e1000_check_64k_bound(adapter, skb->data, bufsz)) {
4103                         struct sk_buff *oldskb = skb;
4104                         e_err(rx_err, "skb align check failed: %u bytes at "
4105                               "%p\n", bufsz, skb->data);
4106                         /* Try again, without freeing the previous */
4107                         skb = netdev_alloc_skb_ip_align(netdev, bufsz);
4108                         /* Failed allocation, critical failure */
4109                         if (!skb) {
4110                                 dev_kfree_skb(oldskb);
4111                                 adapter->alloc_rx_buff_failed++;
4112                                 break;
4113                         }
4114
4115                         if (!e1000_check_64k_bound(adapter, skb->data, bufsz)) {
4116                                 /* give up */
4117                                 dev_kfree_skb(skb);
4118                                 dev_kfree_skb(oldskb);
4119                                 adapter->alloc_rx_buff_failed++;
4120                                 break; /* while !buffer_info->skb */
4121                         }
4122
4123                         /* Use new allocation */
4124                         dev_kfree_skb(oldskb);
4125                 }
4126                 buffer_info->skb = skb;
4127                 buffer_info->length = adapter->rx_buffer_len;
4128 map_skb:
4129                 buffer_info->dma = dma_map_single(&pdev->dev,
4130                                                   skb->data,
4131                                                   buffer_info->length,
4132                                                   DMA_FROM_DEVICE);
4133                 if (dma_mapping_error(&pdev->dev, buffer_info->dma)) {
4134                         dev_kfree_skb(skb);
4135                         buffer_info->skb = NULL;
4136                         buffer_info->dma = 0;
4137                         adapter->alloc_rx_buff_failed++;
4138                         break; /* while !buffer_info->skb */
4139                 }
4140
4141                 /*
4142                  * XXX if it was allocated cleanly it will never map to a
4143                  * boundary crossing
4144                  */
4145
4146                 /* Fix for errata 23, can't cross 64kB boundary */
4147                 if (!e1000_check_64k_bound(adapter,
4148                                         (void *)(unsigned long)buffer_info->dma,
4149                                         adapter->rx_buffer_len)) {
4150                         e_err(rx_err, "dma align check failed: %u bytes at "
4151                               "%p\n", adapter->rx_buffer_len,
4152                               (void *)(unsigned long)buffer_info->dma);
4153                         dev_kfree_skb(skb);
4154                         buffer_info->skb = NULL;
4155
4156                         dma_unmap_single(&pdev->dev, buffer_info->dma,
4157                                          adapter->rx_buffer_len,
4158                                          DMA_FROM_DEVICE);
4159                         buffer_info->dma = 0;
4160
4161                         adapter->alloc_rx_buff_failed++;
4162                         break; /* while !buffer_info->skb */
4163                 }
4164                 rx_desc = E1000_RX_DESC(*rx_ring, i);
4165                 rx_desc->buffer_addr = cpu_to_le64(buffer_info->dma);
4166
4167                 if (unlikely(++i == rx_ring->count))
4168                         i = 0;
4169                 buffer_info = &rx_ring->buffer_info[i];
4170         }
4171
4172         if (likely(rx_ring->next_to_use != i)) {
4173                 rx_ring->next_to_use = i;
4174                 if (unlikely(i-- == 0))
4175                         i = (rx_ring->count - 1);
4176
4177                 /* Force memory writes to complete before letting h/w
4178                  * know there are new descriptors to fetch.  (Only
4179                  * applicable for weak-ordered memory model archs,
4180                  * such as IA-64). */
4181                 wmb();
4182                 writel(i, hw->hw_addr + rx_ring->rdt);
4183         }
4184 }
4185
4186 /**
4187  * e1000_smartspeed - Workaround for SmartSpeed on 82541 and 82547 controllers.
4188  * @adapter:
4189  **/
4190
4191 static void e1000_smartspeed(struct e1000_adapter *adapter)
4192 {
4193         struct e1000_hw *hw = &adapter->hw;
4194         u16 phy_status;
4195         u16 phy_ctrl;
4196
4197         if ((hw->phy_type != e1000_phy_igp) || !hw->autoneg ||
4198            !(hw->autoneg_advertised & ADVERTISE_1000_FULL))
4199                 return;
4200
4201         if (adapter->smartspeed == 0) {
4202                 /* If Master/Slave config fault is asserted twice,
4203                  * we assume back-to-back */
4204                 e1000_read_phy_reg(hw, PHY_1000T_STATUS, &phy_status);
4205                 if (!(phy_status & SR_1000T_MS_CONFIG_FAULT)) return;
4206                 e1000_read_phy_reg(hw, PHY_1000T_STATUS, &phy_status);
4207                 if (!(phy_status & SR_1000T_MS_CONFIG_FAULT)) return;
4208                 e1000_read_phy_reg(hw, PHY_1000T_CTRL, &phy_ctrl);
4209                 if (phy_ctrl & CR_1000T_MS_ENABLE) {
4210                         phy_ctrl &= ~CR_1000T_MS_ENABLE;
4211                         e1000_write_phy_reg(hw, PHY_1000T_CTRL,
4212                                             phy_ctrl);
4213                         adapter->smartspeed++;
4214                         if (!e1000_phy_setup_autoneg(hw) &&
4215                            !e1000_read_phy_reg(hw, PHY_CTRL,
4216                                                &phy_ctrl)) {
4217                                 phy_ctrl |= (MII_CR_AUTO_NEG_EN |
4218                                              MII_CR_RESTART_AUTO_NEG);
4219                                 e1000_write_phy_reg(hw, PHY_CTRL,
4220                                                     phy_ctrl);
4221                         }
4222                 }
4223                 return;
4224         } else if (adapter->smartspeed == E1000_SMARTSPEED_DOWNSHIFT) {
4225                 /* If still no link, perhaps using 2/3 pair cable */
4226                 e1000_read_phy_reg(hw, PHY_1000T_CTRL, &phy_ctrl);
4227                 phy_ctrl |= CR_1000T_MS_ENABLE;
4228                 e1000_write_phy_reg(hw, PHY_1000T_CTRL, phy_ctrl);
4229                 if (!e1000_phy_setup_autoneg(hw) &&
4230                    !e1000_read_phy_reg(hw, PHY_CTRL, &phy_ctrl)) {
4231                         phy_ctrl |= (MII_CR_AUTO_NEG_EN |
4232                                      MII_CR_RESTART_AUTO_NEG);
4233                         e1000_write_phy_reg(hw, PHY_CTRL, phy_ctrl);
4234                 }
4235         }
4236         /* Restart process after E1000_SMARTSPEED_MAX iterations */
4237         if (adapter->smartspeed++ == E1000_SMARTSPEED_MAX)
4238                 adapter->smartspeed = 0;
4239 }
4240
4241 /**
4242  * e1000_ioctl -
4243  * @netdev:
4244  * @ifreq:
4245  * @cmd:
4246  **/
4247
4248 static int e1000_ioctl(struct net_device *netdev, struct ifreq *ifr, int cmd)
4249 {
4250         switch (cmd) {
4251         case SIOCGMIIPHY:
4252         case SIOCGMIIREG:
4253         case SIOCSMIIREG:
4254                 return e1000_mii_ioctl(netdev, ifr, cmd);
4255         default:
4256                 return -EOPNOTSUPP;
4257         }
4258 }
4259
4260 /**
4261  * e1000_mii_ioctl -
4262  * @netdev:
4263  * @ifreq:
4264  * @cmd:
4265  **/
4266
4267 static int e1000_mii_ioctl(struct net_device *netdev, struct ifreq *ifr,
4268                            int cmd)
4269 {
4270         struct e1000_adapter *adapter = netdev_priv(netdev);
4271         struct e1000_hw *hw = &adapter->hw;
4272         struct mii_ioctl_data *data = if_mii(ifr);
4273         int retval;
4274         u16 mii_reg;
4275         u16 spddplx;
4276         unsigned long flags;
4277
4278         if (hw->media_type != e1000_media_type_copper)
4279                 return -EOPNOTSUPP;
4280
4281         switch (cmd) {
4282         case SIOCGMIIPHY:
4283                 data->phy_id = hw->phy_addr;
4284                 break;
4285         case SIOCGMIIREG:
4286                 spin_lock_irqsave(&adapter->stats_lock, flags);
4287                 if (e1000_read_phy_reg(hw, data->reg_num & 0x1F,
4288                                    &data->val_out)) {
4289                         spin_unlock_irqrestore(&adapter->stats_lock, flags);
4290                         return -EIO;
4291                 }
4292                 spin_unlock_irqrestore(&adapter->stats_lock, flags);
4293                 break;
4294         case SIOCSMIIREG:
4295                 if (data->reg_num & ~(0x1F))
4296                         return -EFAULT;
4297                 mii_reg = data->val_in;
4298                 spin_lock_irqsave(&adapter->stats_lock, flags);
4299                 if (e1000_write_phy_reg(hw, data->reg_num,
4300                                         mii_reg)) {
4301                         spin_unlock_irqrestore(&adapter->stats_lock, flags);
4302                         return -EIO;
4303                 }
4304                 spin_unlock_irqrestore(&adapter->stats_lock, flags);
4305                 if (hw->media_type == e1000_media_type_copper) {
4306                         switch (data->reg_num) {
4307                         case PHY_CTRL:
4308                                 if (mii_reg & MII_CR_POWER_DOWN)
4309                                         break;
4310                                 if (mii_reg & MII_CR_AUTO_NEG_EN) {
4311                                         hw->autoneg = 1;
4312                                         hw->autoneg_advertised = 0x2F;
4313                                 } else {
4314                                         if (mii_reg & 0x40)
4315                                                 spddplx = SPEED_1000;
4316                                         else if (mii_reg & 0x2000)
4317                                                 spddplx = SPEED_100;
4318                                         else
4319                                                 spddplx = SPEED_10;
4320                                         spddplx += (mii_reg & 0x100)
4321                                                    ? DUPLEX_FULL :
4322                                                    DUPLEX_HALF;
4323                                         retval = e1000_set_spd_dplx(adapter,
4324                                                                     spddplx);
4325                                         if (retval)
4326                                                 return retval;
4327                                 }
4328                                 if (netif_running(adapter->netdev))
4329                                         e1000_reinit_locked(adapter);
4330                                 else
4331                                         e1000_reset(adapter);
4332                                 break;
4333                         case M88E1000_PHY_SPEC_CTRL:
4334                         case M88E1000_EXT_PHY_SPEC_CTRL:
4335                                 if (e1000_phy_reset(hw))
4336                                         return -EIO;
4337                                 break;
4338                         }
4339                 } else {
4340                         switch (data->reg_num) {
4341                         case PHY_CTRL:
4342                                 if (mii_reg & MII_CR_POWER_DOWN)
4343                                         break;
4344                                 if (netif_running(adapter->netdev))
4345                                         e1000_reinit_locked(adapter);
4346                                 else
4347                                         e1000_reset(adapter);
4348                                 break;
4349                         }
4350                 }
4351                 break;
4352         default:
4353                 return -EOPNOTSUPP;
4354         }
4355         return E1000_SUCCESS;
4356 }
4357
4358 void e1000_pci_set_mwi(struct e1000_hw *hw)
4359 {
4360         struct e1000_adapter *adapter = hw->back;
4361         int ret_val = pci_set_mwi(adapter->pdev);
4362
4363         if (ret_val)
4364                 e_err(probe, "Error in setting MWI\n");
4365 }
4366
4367 void e1000_pci_clear_mwi(struct e1000_hw *hw)
4368 {
4369         struct e1000_adapter *adapter = hw->back;
4370
4371         pci_clear_mwi(adapter->pdev);
4372 }
4373
4374 int e1000_pcix_get_mmrbc(struct e1000_hw *hw)
4375 {
4376         struct e1000_adapter *adapter = hw->back;
4377         return pcix_get_mmrbc(adapter->pdev);
4378 }
4379
4380 void e1000_pcix_set_mmrbc(struct e1000_hw *hw, int mmrbc)
4381 {
4382         struct e1000_adapter *adapter = hw->back;
4383         pcix_set_mmrbc(adapter->pdev, mmrbc);
4384 }
4385
4386 void e1000_io_write(struct e1000_hw *hw, unsigned long port, u32 value)
4387 {
4388         outl(value, port);
4389 }
4390
4391 static void e1000_vlan_rx_register(struct net_device *netdev,
4392                                    struct vlan_group *grp)
4393 {
4394         struct e1000_adapter *adapter = netdev_priv(netdev);
4395         struct e1000_hw *hw = &adapter->hw;
4396         u32 ctrl, rctl;
4397
4398         if (!test_bit(__E1000_DOWN, &adapter->flags))
4399                 e1000_irq_disable(adapter);
4400         adapter->vlgrp = grp;
4401
4402         if (grp) {
4403                 /* enable VLAN tag insert/strip */
4404                 ctrl = er32(CTRL);
4405                 ctrl |= E1000_CTRL_VME;
4406                 ew32(CTRL, ctrl);
4407
4408                 /* enable VLAN receive filtering */
4409                 rctl = er32(RCTL);
4410                 rctl &= ~E1000_RCTL_CFIEN;
4411                 if (!(netdev->flags & IFF_PROMISC))
4412                         rctl |= E1000_RCTL_VFE;
4413                 ew32(RCTL, rctl);
4414                 e1000_update_mng_vlan(adapter);
4415         } else {
4416                 /* disable VLAN tag insert/strip */
4417                 ctrl = er32(CTRL);
4418                 ctrl &= ~E1000_CTRL_VME;
4419                 ew32(CTRL, ctrl);
4420
4421                 /* disable VLAN receive filtering */
4422                 rctl = er32(RCTL);
4423                 rctl &= ~E1000_RCTL_VFE;
4424                 ew32(RCTL, rctl);
4425
4426                 if (adapter->mng_vlan_id != (u16)E1000_MNG_VLAN_NONE) {
4427                         e1000_vlan_rx_kill_vid(netdev, adapter->mng_vlan_id);
4428                         adapter->mng_vlan_id = E1000_MNG_VLAN_NONE;
4429                 }
4430         }
4431
4432         if (!test_bit(__E1000_DOWN, &adapter->flags))
4433                 e1000_irq_enable(adapter);
4434 }
4435
4436 static void e1000_vlan_rx_add_vid(struct net_device *netdev, u16 vid)
4437 {
4438         struct e1000_adapter *adapter = netdev_priv(netdev);
4439         struct e1000_hw *hw = &adapter->hw;
4440         u32 vfta, index;
4441
4442         if ((hw->mng_cookie.status &
4443              E1000_MNG_DHCP_COOKIE_STATUS_VLAN_SUPPORT) &&
4444             (vid == adapter->mng_vlan_id))
4445                 return;
4446         /* add VID to filter table */
4447         index = (vid >> 5) & 0x7F;
4448         vfta = E1000_READ_REG_ARRAY(hw, VFTA, index);
4449         vfta |= (1 << (vid & 0x1F));
4450         e1000_write_vfta(hw, index, vfta);
4451 }
4452
4453 static void e1000_vlan_rx_kill_vid(struct net_device *netdev, u16 vid)
4454 {
4455         struct e1000_adapter *adapter = netdev_priv(netdev);
4456         struct e1000_hw *hw = &adapter->hw;
4457         u32 vfta, index;
4458
4459         if (!test_bit(__E1000_DOWN, &adapter->flags))
4460                 e1000_irq_disable(adapter);
4461         vlan_group_set_device(adapter->vlgrp, vid, NULL);
4462         if (!test_bit(__E1000_DOWN, &adapter->flags))
4463                 e1000_irq_enable(adapter);
4464
4465         /* remove VID from filter table */
4466         index = (vid >> 5) & 0x7F;
4467         vfta = E1000_READ_REG_ARRAY(hw, VFTA, index);
4468         vfta &= ~(1 << (vid & 0x1F));
4469         e1000_write_vfta(hw, index, vfta);
4470 }
4471
4472 static void e1000_restore_vlan(struct e1000_adapter *adapter)
4473 {
4474         e1000_vlan_rx_register(adapter->netdev, adapter->vlgrp);
4475
4476         if (adapter->vlgrp) {
4477                 u16 vid;
4478                 for (vid = 0; vid < VLAN_GROUP_ARRAY_LEN; vid++) {
4479                         if (!vlan_group_get_device(adapter->vlgrp, vid))
4480                                 continue;
4481                         e1000_vlan_rx_add_vid(adapter->netdev, vid);
4482                 }
4483         }
4484 }
4485
4486 int e1000_set_spd_dplx(struct e1000_adapter *adapter, u16 spddplx)
4487 {
4488         struct e1000_hw *hw = &adapter->hw;
4489
4490         hw->autoneg = 0;
4491
4492         /* Fiber NICs only allow 1000 gbps Full duplex */
4493         if ((hw->media_type == e1000_media_type_fiber) &&
4494                 spddplx != (SPEED_1000 + DUPLEX_FULL)) {
4495                 e_err(probe, "Unsupported Speed/Duplex configuration\n");
4496                 return -EINVAL;
4497         }
4498
4499         switch (spddplx) {
4500         case SPEED_10 + DUPLEX_HALF:
4501                 hw->forced_speed_duplex = e1000_10_half;
4502                 break;
4503         case SPEED_10 + DUPLEX_FULL:
4504                 hw->forced_speed_duplex = e1000_10_full;
4505                 break;
4506         case SPEED_100 + DUPLEX_HALF:
4507                 hw->forced_speed_duplex = e1000_100_half;
4508                 break;
4509         case SPEED_100 + DUPLEX_FULL:
4510                 hw->forced_speed_duplex = e1000_100_full;
4511                 break;
4512         case SPEED_1000 + DUPLEX_FULL:
4513                 hw->autoneg = 1;
4514                 hw->autoneg_advertised = ADVERTISE_1000_FULL;
4515                 break;
4516         case SPEED_1000 + DUPLEX_HALF: /* not supported */
4517         default:
4518                 e_err(probe, "Unsupported Speed/Duplex configuration\n");
4519                 return -EINVAL;
4520         }
4521         return 0;
4522 }
4523
4524 static int __e1000_shutdown(struct pci_dev *pdev, bool *enable_wake)
4525 {
4526         struct net_device *netdev = pci_get_drvdata(pdev);
4527         struct e1000_adapter *adapter = netdev_priv(netdev);
4528         struct e1000_hw *hw = &adapter->hw;
4529         u32 ctrl, ctrl_ext, rctl, status;
4530         u32 wufc = adapter->wol;
4531 #ifdef CONFIG_PM
4532         int retval = 0;
4533 #endif
4534
4535         netif_device_detach(netdev);
4536
4537         if (netif_running(netdev)) {
4538                 WARN_ON(test_bit(__E1000_RESETTING, &adapter->flags));
4539                 e1000_down(adapter);
4540         }
4541
4542 #ifdef CONFIG_PM
4543         retval = pci_save_state(pdev);
4544         if (retval)
4545                 return retval;
4546 #endif
4547
4548         status = er32(STATUS);
4549         if (status & E1000_STATUS_LU)
4550                 wufc &= ~E1000_WUFC_LNKC;
4551
4552         if (wufc) {
4553                 e1000_setup_rctl(adapter);
4554                 e1000_set_rx_mode(netdev);
4555
4556                 /* turn on all-multi mode if wake on multicast is enabled */
4557                 if (wufc & E1000_WUFC_MC) {
4558                         rctl = er32(RCTL);
4559                         rctl |= E1000_RCTL_MPE;
4560                         ew32(RCTL, rctl);
4561                 }
4562
4563                 if (hw->mac_type >= e1000_82540) {
4564                         ctrl = er32(CTRL);
4565                         /* advertise wake from D3Cold */
4566                         #define E1000_CTRL_ADVD3WUC 0x00100000
4567                         /* phy power management enable */
4568                         #define E1000_CTRL_EN_PHY_PWR_MGMT 0x00200000
4569                         ctrl |= E1000_CTRL_ADVD3WUC |
4570                                 E1000_CTRL_EN_PHY_PWR_MGMT;
4571                         ew32(CTRL, ctrl);
4572                 }
4573
4574                 if (hw->media_type == e1000_media_type_fiber ||
4575                     hw->media_type == e1000_media_type_internal_serdes) {
4576                         /* keep the laser running in D3 */
4577                         ctrl_ext = er32(CTRL_EXT);
4578                         ctrl_ext |= E1000_CTRL_EXT_SDP7_DATA;
4579                         ew32(CTRL_EXT, ctrl_ext);
4580                 }
4581
4582                 ew32(WUC, E1000_WUC_PME_EN);
4583                 ew32(WUFC, wufc);
4584         } else {
4585                 ew32(WUC, 0);
4586                 ew32(WUFC, 0);
4587         }
4588
4589         e1000_release_manageability(adapter);
4590
4591         *enable_wake = !!wufc;
4592
4593         /* make sure adapter isn't asleep if manageability is enabled */
4594         if (adapter->en_mng_pt)
4595                 *enable_wake = true;
4596
4597         if (netif_running(netdev))
4598                 e1000_free_irq(adapter);
4599
4600         pci_disable_device(pdev);
4601
4602         return 0;
4603 }
4604
4605 #ifdef CONFIG_PM
4606 static int e1000_suspend(struct pci_dev *pdev, pm_message_t state)
4607 {
4608         int retval;
4609         bool wake;
4610
4611         retval = __e1000_shutdown(pdev, &wake);
4612         if (retval)
4613                 return retval;
4614
4615         if (wake) {
4616                 pci_prepare_to_sleep(pdev);
4617         } else {
4618                 pci_wake_from_d3(pdev, false);
4619                 pci_set_power_state(pdev, PCI_D3hot);
4620         }
4621
4622         return 0;
4623 }
4624
4625 static int e1000_resume(struct pci_dev *pdev)
4626 {
4627         struct net_device *netdev = pci_get_drvdata(pdev);
4628         struct e1000_adapter *adapter = netdev_priv(netdev);
4629         struct e1000_hw *hw = &adapter->hw;
4630         u32 err;
4631
4632         pci_set_power_state(pdev, PCI_D0);
4633         pci_restore_state(pdev);
4634         pci_save_state(pdev);
4635
4636         if (adapter->need_ioport)
4637                 err = pci_enable_device(pdev);
4638         else
4639                 err = pci_enable_device_mem(pdev);
4640         if (err) {
4641                 pr_err("Cannot enable PCI device from suspend\n");
4642                 return err;
4643         }
4644         pci_set_master(pdev);
4645
4646         pci_enable_wake(pdev, PCI_D3hot, 0);
4647         pci_enable_wake(pdev, PCI_D3cold, 0);
4648
4649         if (netif_running(netdev)) {
4650                 err = e1000_request_irq(adapter);
4651                 if (err)
4652                         return err;
4653         }
4654
4655         e1000_power_up_phy(adapter);
4656         e1000_reset(adapter);
4657         ew32(WUS, ~0);
4658
4659         e1000_init_manageability(adapter);
4660
4661         if (netif_running(netdev))
4662                 e1000_up(adapter);
4663
4664         netif_device_attach(netdev);
4665
4666         return 0;
4667 }
4668 #endif
4669
4670 static void e1000_shutdown(struct pci_dev *pdev)
4671 {
4672         bool wake;
4673
4674         __e1000_shutdown(pdev, &wake);
4675
4676         if (system_state == SYSTEM_POWER_OFF) {
4677                 pci_wake_from_d3(pdev, wake);
4678                 pci_set_power_state(pdev, PCI_D3hot);
4679         }
4680 }
4681
4682 #ifdef CONFIG_NET_POLL_CONTROLLER
4683 /*
4684  * Polling 'interrupt' - used by things like netconsole to send skbs
4685  * without having to re-enable interrupts. It's not called while
4686  * the interrupt routine is executing.
4687  */
4688 static void e1000_netpoll(struct net_device *netdev)
4689 {
4690         struct e1000_adapter *adapter = netdev_priv(netdev);
4691
4692         disable_irq(adapter->pdev->irq);
4693         e1000_intr(adapter->pdev->irq, netdev);
4694         enable_irq(adapter->pdev->irq);
4695 }
4696 #endif
4697
4698 /**
4699  * e1000_io_error_detected - called when PCI error is detected
4700  * @pdev: Pointer to PCI device
4701  * @state: The current pci connection state
4702  *
4703  * This function is called after a PCI bus error affecting
4704  * this device has been detected.
4705  */
4706 static pci_ers_result_t e1000_io_error_detected(struct pci_dev *pdev,
4707                                                 pci_channel_state_t state)
4708 {
4709         struct net_device *netdev = pci_get_drvdata(pdev);
4710         struct e1000_adapter *adapter = netdev_priv(netdev);
4711
4712         netif_device_detach(netdev);
4713
4714         if (state == pci_channel_io_perm_failure)
4715                 return PCI_ERS_RESULT_DISCONNECT;
4716
4717         if (netif_running(netdev))
4718                 e1000_down(adapter);
4719         pci_disable_device(pdev);
4720
4721         /* Request a slot slot reset. */
4722         return PCI_ERS_RESULT_NEED_RESET;
4723 }
4724
4725 /**
4726  * e1000_io_slot_reset - called after the pci bus has been reset.
4727  * @pdev: Pointer to PCI device
4728  *
4729  * Restart the card from scratch, as if from a cold-boot. Implementation
4730  * resembles the first-half of the e1000_resume routine.
4731  */
4732 static pci_ers_result_t e1000_io_slot_reset(struct pci_dev *pdev)
4733 {
4734         struct net_device *netdev = pci_get_drvdata(pdev);
4735         struct e1000_adapter *adapter = netdev_priv(netdev);
4736         struct e1000_hw *hw = &adapter->hw;
4737         int err;
4738
4739         if (adapter->need_ioport)
4740                 err = pci_enable_device(pdev);
4741         else
4742                 err = pci_enable_device_mem(pdev);
4743         if (err) {
4744                 pr_err("Cannot re-enable PCI device after reset.\n");
4745                 return PCI_ERS_RESULT_DISCONNECT;
4746         }
4747         pci_set_master(pdev);
4748
4749         pci_enable_wake(pdev, PCI_D3hot, 0);
4750         pci_enable_wake(pdev, PCI_D3cold, 0);
4751
4752         e1000_reset(adapter);
4753         ew32(WUS, ~0);
4754
4755         return PCI_ERS_RESULT_RECOVERED;
4756 }
4757
4758 /**
4759  * e1000_io_resume - called when traffic can start flowing again.
4760  * @pdev: Pointer to PCI device
4761  *
4762  * This callback is called when the error recovery driver tells us that
4763  * its OK to resume normal operation. Implementation resembles the
4764  * second-half of the e1000_resume routine.
4765  */
4766 static void e1000_io_resume(struct pci_dev *pdev)
4767 {
4768         struct net_device *netdev = pci_get_drvdata(pdev);
4769         struct e1000_adapter *adapter = netdev_priv(netdev);
4770
4771         e1000_init_manageability(adapter);
4772
4773         if (netif_running(netdev)) {
4774                 if (e1000_up(adapter)) {
4775                         pr_info("can't bring device back up after reset\n");
4776                         return;
4777                 }
4778         }
4779
4780         netif_device_attach(netdev);
4781 }
4782
4783 /* e1000_main.c */