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("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_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("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("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("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("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("(PCI%s:%s:%s) ",
1051                 ((hw->bus_type == e1000_bus_type_pcix) ? "-X" : ""),
1052                 ((hw->bus_speed == e1000_bus_speed_133) ? "133MHz" :
1053                  (hw->bus_speed == e1000_bus_speed_120) ? "120MHz" :
1054                  (hw->bus_speed == e1000_bus_speed_100) ? "100MHz" :
1055                  (hw->bus_speed == e1000_bus_speed_66) ? "66MHz" : "33MHz"),
1056                 ((hw->bus_width == e1000_bus_width_64) ? "64-bit" : "32-bit"));
1057
1058         e_info("%pM\n", netdev->dev_addr);
1059
1060         /* carrier off reporting is important to ethtool even BEFORE open */
1061         netif_carrier_off(netdev);
1062
1063         e_info("Intel(R) PRO/1000 Network Connection\n");
1064
1065         cards_found++;
1066         return 0;
1067
1068 err_register:
1069 err_eeprom:
1070         e1000_phy_hw_reset(hw);
1071
1072         if (hw->flash_address)
1073                 iounmap(hw->flash_address);
1074         kfree(adapter->tx_ring);
1075         kfree(adapter->rx_ring);
1076 err_sw_init:
1077         iounmap(hw->hw_addr);
1078 err_ioremap:
1079         free_netdev(netdev);
1080 err_alloc_etherdev:
1081         pci_release_selected_regions(pdev, bars);
1082 err_pci_reg:
1083 err_dma:
1084         pci_disable_device(pdev);
1085         return err;
1086 }
1087
1088 /**
1089  * e1000_remove - Device Removal Routine
1090  * @pdev: PCI device information struct
1091  *
1092  * e1000_remove is called by the PCI subsystem to alert the driver
1093  * that it should release a PCI device.  The could be caused by a
1094  * Hot-Plug event, or because the driver is going to be removed from
1095  * memory.
1096  **/
1097
1098 static void __devexit e1000_remove(struct pci_dev *pdev)
1099 {
1100         struct net_device *netdev = pci_get_drvdata(pdev);
1101         struct e1000_adapter *adapter = netdev_priv(netdev);
1102         struct e1000_hw *hw = &adapter->hw;
1103
1104         set_bit(__E1000_DOWN, &adapter->flags);
1105         del_timer_sync(&adapter->tx_fifo_stall_timer);
1106         del_timer_sync(&adapter->watchdog_timer);
1107         del_timer_sync(&adapter->phy_info_timer);
1108
1109         cancel_work_sync(&adapter->reset_task);
1110
1111         e1000_release_manageability(adapter);
1112
1113         unregister_netdev(netdev);
1114
1115         e1000_phy_hw_reset(hw);
1116
1117         kfree(adapter->tx_ring);
1118         kfree(adapter->rx_ring);
1119
1120         iounmap(hw->hw_addr);
1121         if (hw->flash_address)
1122                 iounmap(hw->flash_address);
1123         pci_release_selected_regions(pdev, adapter->bars);
1124
1125         free_netdev(netdev);
1126
1127         pci_disable_device(pdev);
1128 }
1129
1130 /**
1131  * e1000_sw_init - Initialize general software structures (struct e1000_adapter)
1132  * @adapter: board private structure to initialize
1133  *
1134  * e1000_sw_init initializes the Adapter private data structure.
1135  * Fields are initialized based on PCI device information and
1136  * OS network device settings (MTU size).
1137  **/
1138
1139 static int __devinit e1000_sw_init(struct e1000_adapter *adapter)
1140 {
1141         struct e1000_hw *hw = &adapter->hw;
1142         struct net_device *netdev = adapter->netdev;
1143         struct pci_dev *pdev = adapter->pdev;
1144
1145         /* PCI config space info */
1146
1147         hw->vendor_id = pdev->vendor;
1148         hw->device_id = pdev->device;
1149         hw->subsystem_vendor_id = pdev->subsystem_vendor;
1150         hw->subsystem_id = pdev->subsystem_device;
1151         hw->revision_id = pdev->revision;
1152
1153         pci_read_config_word(pdev, PCI_COMMAND, &hw->pci_cmd_word);
1154
1155         adapter->rx_buffer_len = MAXIMUM_ETHERNET_VLAN_SIZE;
1156         hw->max_frame_size = netdev->mtu +
1157                              ENET_HEADER_SIZE + ETHERNET_FCS_SIZE;
1158         hw->min_frame_size = MINIMUM_ETHERNET_FRAME_SIZE;
1159
1160         /* identify the MAC */
1161
1162         if (e1000_set_mac_type(hw)) {
1163                 e_err("Unknown MAC Type\n");
1164                 return -EIO;
1165         }
1166
1167         switch (hw->mac_type) {
1168         default:
1169                 break;
1170         case e1000_82541:
1171         case e1000_82547:
1172         case e1000_82541_rev_2:
1173         case e1000_82547_rev_2:
1174                 hw->phy_init_script = 1;
1175                 break;
1176         }
1177
1178         e1000_set_media_type(hw);
1179
1180         hw->wait_autoneg_complete = false;
1181         hw->tbi_compatibility_en = true;
1182         hw->adaptive_ifs = true;
1183
1184         /* Copper options */
1185
1186         if (hw->media_type == e1000_media_type_copper) {
1187                 hw->mdix = AUTO_ALL_MODES;
1188                 hw->disable_polarity_correction = false;
1189                 hw->master_slave = E1000_MASTER_SLAVE;
1190         }
1191
1192         adapter->num_tx_queues = 1;
1193         adapter->num_rx_queues = 1;
1194
1195         if (e1000_alloc_queues(adapter)) {
1196                 e_err("Unable to allocate memory for queues\n");
1197                 return -ENOMEM;
1198         }
1199
1200         /* Explicitly disable IRQ since the NIC can be in any state. */
1201         e1000_irq_disable(adapter);
1202
1203         spin_lock_init(&adapter->stats_lock);
1204
1205         set_bit(__E1000_DOWN, &adapter->flags);
1206
1207         return 0;
1208 }
1209
1210 /**
1211  * e1000_alloc_queues - Allocate memory for all rings
1212  * @adapter: board private structure to initialize
1213  *
1214  * We allocate one ring per queue at run-time since we don't know the
1215  * number of queues at compile-time.
1216  **/
1217
1218 static int __devinit e1000_alloc_queues(struct e1000_adapter *adapter)
1219 {
1220         adapter->tx_ring = kcalloc(adapter->num_tx_queues,
1221                                    sizeof(struct e1000_tx_ring), GFP_KERNEL);
1222         if (!adapter->tx_ring)
1223                 return -ENOMEM;
1224
1225         adapter->rx_ring = kcalloc(adapter->num_rx_queues,
1226                                    sizeof(struct e1000_rx_ring), GFP_KERNEL);
1227         if (!adapter->rx_ring) {
1228                 kfree(adapter->tx_ring);
1229                 return -ENOMEM;
1230         }
1231
1232         return E1000_SUCCESS;
1233 }
1234
1235 /**
1236  * e1000_open - Called when a network interface is made active
1237  * @netdev: network interface device structure
1238  *
1239  * Returns 0 on success, negative value on failure
1240  *
1241  * The open entry point is called when a network interface is made
1242  * active by the system (IFF_UP).  At this point all resources needed
1243  * for transmit and receive operations are allocated, the interrupt
1244  * handler is registered with the OS, the watchdog timer is started,
1245  * and the stack is notified that the interface is ready.
1246  **/
1247
1248 static int e1000_open(struct net_device *netdev)
1249 {
1250         struct e1000_adapter *adapter = netdev_priv(netdev);
1251         struct e1000_hw *hw = &adapter->hw;
1252         int err;
1253
1254         /* disallow open during test */
1255         if (test_bit(__E1000_TESTING, &adapter->flags))
1256                 return -EBUSY;
1257
1258         netif_carrier_off(netdev);
1259
1260         /* allocate transmit descriptors */
1261         err = e1000_setup_all_tx_resources(adapter);
1262         if (err)
1263                 goto err_setup_tx;
1264
1265         /* allocate receive descriptors */
1266         err = e1000_setup_all_rx_resources(adapter);
1267         if (err)
1268                 goto err_setup_rx;
1269
1270         e1000_power_up_phy(adapter);
1271
1272         adapter->mng_vlan_id = E1000_MNG_VLAN_NONE;
1273         if ((hw->mng_cookie.status &
1274                           E1000_MNG_DHCP_COOKIE_STATUS_VLAN_SUPPORT)) {
1275                 e1000_update_mng_vlan(adapter);
1276         }
1277
1278         /* before we allocate an interrupt, we must be ready to handle it.
1279          * Setting DEBUG_SHIRQ in the kernel makes it fire an interrupt
1280          * as soon as we call pci_request_irq, so we have to setup our
1281          * clean_rx handler before we do so.  */
1282         e1000_configure(adapter);
1283
1284         err = e1000_request_irq(adapter);
1285         if (err)
1286                 goto err_req_irq;
1287
1288         /* From here on the code is the same as e1000_up() */
1289         clear_bit(__E1000_DOWN, &adapter->flags);
1290
1291         napi_enable(&adapter->napi);
1292
1293         e1000_irq_enable(adapter);
1294
1295         netif_start_queue(netdev);
1296
1297         /* fire a link status change interrupt to start the watchdog */
1298         ew32(ICS, E1000_ICS_LSC);
1299
1300         return E1000_SUCCESS;
1301
1302 err_req_irq:
1303         e1000_power_down_phy(adapter);
1304         e1000_free_all_rx_resources(adapter);
1305 err_setup_rx:
1306         e1000_free_all_tx_resources(adapter);
1307 err_setup_tx:
1308         e1000_reset(adapter);
1309
1310         return err;
1311 }
1312
1313 /**
1314  * e1000_close - Disables a network interface
1315  * @netdev: network interface device structure
1316  *
1317  * Returns 0, this is not allowed to fail
1318  *
1319  * The close entry point is called when an interface is de-activated
1320  * by the OS.  The hardware is still under the drivers control, but
1321  * needs to be disabled.  A global MAC reset is issued to stop the
1322  * hardware, and all transmit and receive resources are freed.
1323  **/
1324
1325 static int e1000_close(struct net_device *netdev)
1326 {
1327         struct e1000_adapter *adapter = netdev_priv(netdev);
1328         struct e1000_hw *hw = &adapter->hw;
1329
1330         WARN_ON(test_bit(__E1000_RESETTING, &adapter->flags));
1331         e1000_down(adapter);
1332         e1000_power_down_phy(adapter);
1333         e1000_free_irq(adapter);
1334
1335         e1000_free_all_tx_resources(adapter);
1336         e1000_free_all_rx_resources(adapter);
1337
1338         /* kill manageability vlan ID if supported, but not if a vlan with
1339          * the same ID is registered on the host OS (let 8021q kill it) */
1340         if ((hw->mng_cookie.status &
1341                           E1000_MNG_DHCP_COOKIE_STATUS_VLAN_SUPPORT) &&
1342              !(adapter->vlgrp &&
1343                vlan_group_get_device(adapter->vlgrp, adapter->mng_vlan_id))) {
1344                 e1000_vlan_rx_kill_vid(netdev, adapter->mng_vlan_id);
1345         }
1346
1347         return 0;
1348 }
1349
1350 /**
1351  * e1000_check_64k_bound - check that memory doesn't cross 64kB boundary
1352  * @adapter: address of board private structure
1353  * @start: address of beginning of memory
1354  * @len: length of memory
1355  **/
1356 static bool e1000_check_64k_bound(struct e1000_adapter *adapter, void *start,
1357                                   unsigned long len)
1358 {
1359         struct e1000_hw *hw = &adapter->hw;
1360         unsigned long begin = (unsigned long)start;
1361         unsigned long end = begin + len;
1362
1363         /* First rev 82545 and 82546 need to not allow any memory
1364          * write location to cross 64k boundary due to errata 23 */
1365         if (hw->mac_type == e1000_82545 ||
1366             hw->mac_type == e1000_82546) {
1367                 return ((begin ^ (end - 1)) >> 16) != 0 ? false : true;
1368         }
1369
1370         return true;
1371 }
1372
1373 /**
1374  * e1000_setup_tx_resources - allocate Tx resources (Descriptors)
1375  * @adapter: board private structure
1376  * @txdr:    tx descriptor ring (for a specific queue) to setup
1377  *
1378  * Return 0 on success, negative on failure
1379  **/
1380
1381 static int e1000_setup_tx_resources(struct e1000_adapter *adapter,
1382                                     struct e1000_tx_ring *txdr)
1383 {
1384         struct pci_dev *pdev = adapter->pdev;
1385         int size;
1386
1387         size = sizeof(struct e1000_buffer) * txdr->count;
1388         txdr->buffer_info = vmalloc(size);
1389         if (!txdr->buffer_info) {
1390                 e_err("Unable to allocate memory for the Tx descriptor 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("Unable to allocate memory for the Tx descriptor ring\n");
1406                 return -ENOMEM;
1407         }
1408
1409         /* Fix for errata 23, can't cross 64kB boundary */
1410         if (!e1000_check_64k_bound(adapter, txdr->desc, txdr->size)) {
1411                 void *olddesc = txdr->desc;
1412                 dma_addr_t olddma = txdr->dma;
1413                 e_err("txdr align check failed: %u bytes at %p\n",
1414                       txdr->size, txdr->desc);
1415                 /* Try again, without freeing the previous */
1416                 txdr->desc = dma_alloc_coherent(&pdev->dev, txdr->size,
1417                                                 &txdr->dma, GFP_KERNEL);
1418                 /* Failed allocation, critical failure */
1419                 if (!txdr->desc) {
1420                         dma_free_coherent(&pdev->dev, txdr->size, olddesc,
1421                                           olddma);
1422                         goto setup_tx_desc_die;
1423                 }
1424
1425                 if (!e1000_check_64k_bound(adapter, txdr->desc, txdr->size)) {
1426                         /* give up */
1427                         dma_free_coherent(&pdev->dev, txdr->size, txdr->desc,
1428                                           txdr->dma);
1429                         dma_free_coherent(&pdev->dev, txdr->size, olddesc,
1430                                           olddma);
1431                         e_err("Unable to allocate aligned memory "
1432                               "for the transmit descriptor ring\n");
1433                         vfree(txdr->buffer_info);
1434                         return -ENOMEM;
1435                 } else {
1436                         /* Free old allocation, new allocation was successful */
1437                         dma_free_coherent(&pdev->dev, txdr->size, olddesc,
1438                                           olddma);
1439                 }
1440         }
1441         memset(txdr->desc, 0, txdr->size);
1442
1443         txdr->next_to_use = 0;
1444         txdr->next_to_clean = 0;
1445
1446         return 0;
1447 }
1448
1449 /**
1450  * e1000_setup_all_tx_resources - wrapper to allocate Tx resources
1451  *                                (Descriptors) for all queues
1452  * @adapter: board private structure
1453  *
1454  * Return 0 on success, negative on failure
1455  **/
1456
1457 int e1000_setup_all_tx_resources(struct e1000_adapter *adapter)
1458 {
1459         int i, err = 0;
1460
1461         for (i = 0; i < adapter->num_tx_queues; i++) {
1462                 err = e1000_setup_tx_resources(adapter, &adapter->tx_ring[i]);
1463                 if (err) {
1464                         e_err("Allocation for Tx Queue %u failed\n", i);
1465                         for (i-- ; i >= 0; i--)
1466                                 e1000_free_tx_resources(adapter,
1467                                                         &adapter->tx_ring[i]);
1468                         break;
1469                 }
1470         }
1471
1472         return err;
1473 }
1474
1475 /**
1476  * e1000_configure_tx - Configure 8254x Transmit Unit after Reset
1477  * @adapter: board private structure
1478  *
1479  * Configure the Tx unit of the MAC after a reset.
1480  **/
1481
1482 static void e1000_configure_tx(struct e1000_adapter *adapter)
1483 {
1484         u64 tdba;
1485         struct e1000_hw *hw = &adapter->hw;
1486         u32 tdlen, tctl, tipg;
1487         u32 ipgr1, ipgr2;
1488
1489         /* Setup the HW Tx Head and Tail descriptor pointers */
1490
1491         switch (adapter->num_tx_queues) {
1492         case 1:
1493         default:
1494                 tdba = adapter->tx_ring[0].dma;
1495                 tdlen = adapter->tx_ring[0].count *
1496                         sizeof(struct e1000_tx_desc);
1497                 ew32(TDLEN, tdlen);
1498                 ew32(TDBAH, (tdba >> 32));
1499                 ew32(TDBAL, (tdba & 0x00000000ffffffffULL));
1500                 ew32(TDT, 0);
1501                 ew32(TDH, 0);
1502                 adapter->tx_ring[0].tdh = ((hw->mac_type >= e1000_82543) ? E1000_TDH : E1000_82542_TDH);
1503                 adapter->tx_ring[0].tdt = ((hw->mac_type >= e1000_82543) ? E1000_TDT : E1000_82542_TDT);
1504                 break;
1505         }
1506
1507         /* Set the default values for the Tx Inter Packet Gap timer */
1508         if ((hw->media_type == e1000_media_type_fiber ||
1509              hw->media_type == e1000_media_type_internal_serdes))
1510                 tipg = DEFAULT_82543_TIPG_IPGT_FIBER;
1511         else
1512                 tipg = DEFAULT_82543_TIPG_IPGT_COPPER;
1513
1514         switch (hw->mac_type) {
1515         case e1000_82542_rev2_0:
1516         case e1000_82542_rev2_1:
1517                 tipg = DEFAULT_82542_TIPG_IPGT;
1518                 ipgr1 = DEFAULT_82542_TIPG_IPGR1;
1519                 ipgr2 = DEFAULT_82542_TIPG_IPGR2;
1520                 break;
1521         default:
1522                 ipgr1 = DEFAULT_82543_TIPG_IPGR1;
1523                 ipgr2 = DEFAULT_82543_TIPG_IPGR2;
1524                 break;
1525         }
1526         tipg |= ipgr1 << E1000_TIPG_IPGR1_SHIFT;
1527         tipg |= ipgr2 << E1000_TIPG_IPGR2_SHIFT;
1528         ew32(TIPG, tipg);
1529
1530         /* Set the Tx Interrupt Delay register */
1531
1532         ew32(TIDV, adapter->tx_int_delay);
1533         if (hw->mac_type >= e1000_82540)
1534                 ew32(TADV, adapter->tx_abs_int_delay);
1535
1536         /* Program the Transmit Control Register */
1537
1538         tctl = er32(TCTL);
1539         tctl &= ~E1000_TCTL_CT;
1540         tctl |= E1000_TCTL_PSP | E1000_TCTL_RTLC |
1541                 (E1000_COLLISION_THRESHOLD << E1000_CT_SHIFT);
1542
1543         e1000_config_collision_dist(hw);
1544
1545         /* Setup Transmit Descriptor Settings for eop descriptor */
1546         adapter->txd_cmd = E1000_TXD_CMD_EOP | E1000_TXD_CMD_IFCS;
1547
1548         /* only set IDE if we are delaying interrupts using the timers */
1549         if (adapter->tx_int_delay)
1550                 adapter->txd_cmd |= E1000_TXD_CMD_IDE;
1551
1552         if (hw->mac_type < e1000_82543)
1553                 adapter->txd_cmd |= E1000_TXD_CMD_RPS;
1554         else
1555                 adapter->txd_cmd |= E1000_TXD_CMD_RS;
1556
1557         /* Cache if we're 82544 running in PCI-X because we'll
1558          * need this to apply a workaround later in the send path. */
1559         if (hw->mac_type == e1000_82544 &&
1560             hw->bus_type == e1000_bus_type_pcix)
1561                 adapter->pcix_82544 = 1;
1562
1563         ew32(TCTL, tctl);
1564
1565 }
1566
1567 /**
1568  * e1000_setup_rx_resources - allocate Rx resources (Descriptors)
1569  * @adapter: board private structure
1570  * @rxdr:    rx descriptor ring (for a specific queue) to setup
1571  *
1572  * Returns 0 on success, negative on failure
1573  **/
1574
1575 static int e1000_setup_rx_resources(struct e1000_adapter *adapter,
1576                                     struct e1000_rx_ring *rxdr)
1577 {
1578         struct pci_dev *pdev = adapter->pdev;
1579         int size, desc_len;
1580
1581         size = sizeof(struct e1000_buffer) * rxdr->count;
1582         rxdr->buffer_info = vmalloc(size);
1583         if (!rxdr->buffer_info) {
1584                 e_err("Unable to allocate memory for the Rx descriptor ring\n");
1585                 return -ENOMEM;
1586         }
1587         memset(rxdr->buffer_info, 0, size);
1588
1589         desc_len = sizeof(struct e1000_rx_desc);
1590
1591         /* Round up to nearest 4K */
1592
1593         rxdr->size = rxdr->count * desc_len;
1594         rxdr->size = ALIGN(rxdr->size, 4096);
1595
1596         rxdr->desc = dma_alloc_coherent(&pdev->dev, rxdr->size, &rxdr->dma,
1597                                         GFP_KERNEL);
1598
1599         if (!rxdr->desc) {
1600                 e_err("Unable to allocate memory for the Rx descriptor ring\n");
1601 setup_rx_desc_die:
1602                 vfree(rxdr->buffer_info);
1603                 return -ENOMEM;
1604         }
1605
1606         /* Fix for errata 23, can't cross 64kB boundary */
1607         if (!e1000_check_64k_bound(adapter, rxdr->desc, rxdr->size)) {
1608                 void *olddesc = rxdr->desc;
1609                 dma_addr_t olddma = rxdr->dma;
1610                 e_err("rxdr align check failed: %u bytes at %p\n",
1611                       rxdr->size, rxdr->desc);
1612                 /* Try again, without freeing the previous */
1613                 rxdr->desc = dma_alloc_coherent(&pdev->dev, rxdr->size,
1614                                                 &rxdr->dma, GFP_KERNEL);
1615                 /* Failed allocation, critical failure */
1616                 if (!rxdr->desc) {
1617                         dma_free_coherent(&pdev->dev, rxdr->size, olddesc,
1618                                           olddma);
1619                         e_err("Unable to allocate memory for the Rx descriptor "
1620                               "ring\n");
1621                         goto setup_rx_desc_die;
1622                 }
1623
1624                 if (!e1000_check_64k_bound(adapter, rxdr->desc, rxdr->size)) {
1625                         /* give up */
1626                         dma_free_coherent(&pdev->dev, rxdr->size, rxdr->desc,
1627                                           rxdr->dma);
1628                         dma_free_coherent(&pdev->dev, rxdr->size, olddesc,
1629                                           olddma);
1630                         e_err("Unable to allocate aligned memory for the Rx "
1631                               "descriptor ring\n");
1632                         goto setup_rx_desc_die;
1633                 } else {
1634                         /* Free old allocation, new allocation was successful */
1635                         dma_free_coherent(&pdev->dev, rxdr->size, olddesc,
1636                                           olddma);
1637                 }
1638         }
1639         memset(rxdr->desc, 0, rxdr->size);
1640
1641         rxdr->next_to_clean = 0;
1642         rxdr->next_to_use = 0;
1643         rxdr->rx_skb_top = NULL;
1644
1645         return 0;
1646 }
1647
1648 /**
1649  * e1000_setup_all_rx_resources - wrapper to allocate Rx resources
1650  *                                (Descriptors) for all queues
1651  * @adapter: board private structure
1652  *
1653  * Return 0 on success, negative on failure
1654  **/
1655
1656 int e1000_setup_all_rx_resources(struct e1000_adapter *adapter)
1657 {
1658         int i, err = 0;
1659
1660         for (i = 0; i < adapter->num_rx_queues; i++) {
1661                 err = e1000_setup_rx_resources(adapter, &adapter->rx_ring[i]);
1662                 if (err) {
1663                         e_err("Allocation for Rx Queue %u failed\n", i);
1664                         for (i-- ; i >= 0; i--)
1665                                 e1000_free_rx_resources(adapter,
1666                                                         &adapter->rx_ring[i]);
1667                         break;
1668                 }
1669         }
1670
1671         return err;
1672 }
1673
1674 /**
1675  * e1000_setup_rctl - configure the receive control registers
1676  * @adapter: Board private structure
1677  **/
1678 static void e1000_setup_rctl(struct e1000_adapter *adapter)
1679 {
1680         struct e1000_hw *hw = &adapter->hw;
1681         u32 rctl;
1682
1683         rctl = er32(RCTL);
1684
1685         rctl &= ~(3 << E1000_RCTL_MO_SHIFT);
1686
1687         rctl |= E1000_RCTL_EN | E1000_RCTL_BAM |
1688                 E1000_RCTL_LBM_NO | E1000_RCTL_RDMTS_HALF |
1689                 (hw->mc_filter_type << E1000_RCTL_MO_SHIFT);
1690
1691         if (hw->tbi_compatibility_on == 1)
1692                 rctl |= E1000_RCTL_SBP;
1693         else
1694                 rctl &= ~E1000_RCTL_SBP;
1695
1696         if (adapter->netdev->mtu <= ETH_DATA_LEN)
1697                 rctl &= ~E1000_RCTL_LPE;
1698         else
1699                 rctl |= E1000_RCTL_LPE;
1700
1701         /* Setup buffer sizes */
1702         rctl &= ~E1000_RCTL_SZ_4096;
1703         rctl |= E1000_RCTL_BSEX;
1704         switch (adapter->rx_buffer_len) {
1705                 case E1000_RXBUFFER_2048:
1706                 default:
1707                         rctl |= E1000_RCTL_SZ_2048;
1708                         rctl &= ~E1000_RCTL_BSEX;
1709                         break;
1710                 case E1000_RXBUFFER_4096:
1711                         rctl |= E1000_RCTL_SZ_4096;
1712                         break;
1713                 case E1000_RXBUFFER_8192:
1714                         rctl |= E1000_RCTL_SZ_8192;
1715                         break;
1716                 case E1000_RXBUFFER_16384:
1717                         rctl |= E1000_RCTL_SZ_16384;
1718                         break;
1719         }
1720
1721         ew32(RCTL, rctl);
1722 }
1723
1724 /**
1725  * e1000_configure_rx - Configure 8254x Receive Unit after Reset
1726  * @adapter: board private structure
1727  *
1728  * Configure the Rx unit of the MAC after a reset.
1729  **/
1730
1731 static void e1000_configure_rx(struct e1000_adapter *adapter)
1732 {
1733         u64 rdba;
1734         struct e1000_hw *hw = &adapter->hw;
1735         u32 rdlen, rctl, rxcsum;
1736
1737         if (adapter->netdev->mtu > ETH_DATA_LEN) {
1738                 rdlen = adapter->rx_ring[0].count *
1739                         sizeof(struct e1000_rx_desc);
1740                 adapter->clean_rx = e1000_clean_jumbo_rx_irq;
1741                 adapter->alloc_rx_buf = e1000_alloc_jumbo_rx_buffers;
1742         } else {
1743                 rdlen = adapter->rx_ring[0].count *
1744                         sizeof(struct e1000_rx_desc);
1745                 adapter->clean_rx = e1000_clean_rx_irq;
1746                 adapter->alloc_rx_buf = e1000_alloc_rx_buffers;
1747         }
1748
1749         /* disable receives while setting up the descriptors */
1750         rctl = er32(RCTL);
1751         ew32(RCTL, rctl & ~E1000_RCTL_EN);
1752
1753         /* set the Receive Delay Timer Register */
1754         ew32(RDTR, adapter->rx_int_delay);
1755
1756         if (hw->mac_type >= e1000_82540) {
1757                 ew32(RADV, adapter->rx_abs_int_delay);
1758                 if (adapter->itr_setting != 0)
1759                         ew32(ITR, 1000000000 / (adapter->itr * 256));
1760         }
1761
1762         /* Setup the HW Rx Head and Tail Descriptor Pointers and
1763          * the Base and Length of the Rx Descriptor Ring */
1764         switch (adapter->num_rx_queues) {
1765         case 1:
1766         default:
1767                 rdba = adapter->rx_ring[0].dma;
1768                 ew32(RDLEN, rdlen);
1769                 ew32(RDBAH, (rdba >> 32));
1770                 ew32(RDBAL, (rdba & 0x00000000ffffffffULL));
1771                 ew32(RDT, 0);
1772                 ew32(RDH, 0);
1773                 adapter->rx_ring[0].rdh = ((hw->mac_type >= e1000_82543) ? E1000_RDH : E1000_82542_RDH);
1774                 adapter->rx_ring[0].rdt = ((hw->mac_type >= e1000_82543) ? E1000_RDT : E1000_82542_RDT);
1775                 break;
1776         }
1777
1778         /* Enable 82543 Receive Checksum Offload for TCP and UDP */
1779         if (hw->mac_type >= e1000_82543) {
1780                 rxcsum = er32(RXCSUM);
1781                 if (adapter->rx_csum)
1782                         rxcsum |= E1000_RXCSUM_TUOFL;
1783                 else
1784                         /* don't need to clear IPPCSE as it defaults to 0 */
1785                         rxcsum &= ~E1000_RXCSUM_TUOFL;
1786                 ew32(RXCSUM, rxcsum);
1787         }
1788
1789         /* Enable Receives */
1790         ew32(RCTL, rctl);
1791 }
1792
1793 /**
1794  * e1000_free_tx_resources - Free Tx Resources per Queue
1795  * @adapter: board private structure
1796  * @tx_ring: Tx descriptor ring for a specific queue
1797  *
1798  * Free all transmit software resources
1799  **/
1800
1801 static void e1000_free_tx_resources(struct e1000_adapter *adapter,
1802                                     struct e1000_tx_ring *tx_ring)
1803 {
1804         struct pci_dev *pdev = adapter->pdev;
1805
1806         e1000_clean_tx_ring(adapter, tx_ring);
1807
1808         vfree(tx_ring->buffer_info);
1809         tx_ring->buffer_info = NULL;
1810
1811         dma_free_coherent(&pdev->dev, tx_ring->size, tx_ring->desc,
1812                           tx_ring->dma);
1813
1814         tx_ring->desc = NULL;
1815 }
1816
1817 /**
1818  * e1000_free_all_tx_resources - Free Tx Resources for All Queues
1819  * @adapter: board private structure
1820  *
1821  * Free all transmit software resources
1822  **/
1823
1824 void e1000_free_all_tx_resources(struct e1000_adapter *adapter)
1825 {
1826         int i;
1827
1828         for (i = 0; i < adapter->num_tx_queues; i++)
1829                 e1000_free_tx_resources(adapter, &adapter->tx_ring[i]);
1830 }
1831
1832 static void e1000_unmap_and_free_tx_resource(struct e1000_adapter *adapter,
1833                                              struct e1000_buffer *buffer_info)
1834 {
1835         if (buffer_info->dma) {
1836                 if (buffer_info->mapped_as_page)
1837                         dma_unmap_page(&adapter->pdev->dev, buffer_info->dma,
1838                                        buffer_info->length, DMA_TO_DEVICE);
1839                 else
1840                         dma_unmap_single(&adapter->pdev->dev, buffer_info->dma,
1841                                          buffer_info->length,
1842                                          DMA_TO_DEVICE);
1843                 buffer_info->dma = 0;
1844         }
1845         if (buffer_info->skb) {
1846                 dev_kfree_skb_any(buffer_info->skb);
1847                 buffer_info->skb = NULL;
1848         }
1849         buffer_info->time_stamp = 0;
1850         /* buffer_info must be completely set up in the transmit path */
1851 }
1852
1853 /**
1854  * e1000_clean_tx_ring - Free Tx Buffers
1855  * @adapter: board private structure
1856  * @tx_ring: ring to be cleaned
1857  **/
1858
1859 static void e1000_clean_tx_ring(struct e1000_adapter *adapter,
1860                                 struct e1000_tx_ring *tx_ring)
1861 {
1862         struct e1000_hw *hw = &adapter->hw;
1863         struct e1000_buffer *buffer_info;
1864         unsigned long size;
1865         unsigned int i;
1866
1867         /* Free all the Tx ring sk_buffs */
1868
1869         for (i = 0; i < tx_ring->count; i++) {
1870                 buffer_info = &tx_ring->buffer_info[i];
1871                 e1000_unmap_and_free_tx_resource(adapter, buffer_info);
1872         }
1873
1874         size = sizeof(struct e1000_buffer) * tx_ring->count;
1875         memset(tx_ring->buffer_info, 0, size);
1876
1877         /* Zero out the descriptor ring */
1878
1879         memset(tx_ring->desc, 0, tx_ring->size);
1880
1881         tx_ring->next_to_use = 0;
1882         tx_ring->next_to_clean = 0;
1883         tx_ring->last_tx_tso = 0;
1884
1885         writel(0, hw->hw_addr + tx_ring->tdh);
1886         writel(0, hw->hw_addr + tx_ring->tdt);
1887 }
1888
1889 /**
1890  * e1000_clean_all_tx_rings - Free Tx Buffers for all queues
1891  * @adapter: board private structure
1892  **/
1893
1894 static void e1000_clean_all_tx_rings(struct e1000_adapter *adapter)
1895 {
1896         int i;
1897
1898         for (i = 0; i < adapter->num_tx_queues; i++)
1899                 e1000_clean_tx_ring(adapter, &adapter->tx_ring[i]);
1900 }
1901
1902 /**
1903  * e1000_free_rx_resources - Free Rx Resources
1904  * @adapter: board private structure
1905  * @rx_ring: ring to clean the resources from
1906  *
1907  * Free all receive software resources
1908  **/
1909
1910 static void e1000_free_rx_resources(struct e1000_adapter *adapter,
1911                                     struct e1000_rx_ring *rx_ring)
1912 {
1913         struct pci_dev *pdev = adapter->pdev;
1914
1915         e1000_clean_rx_ring(adapter, rx_ring);
1916
1917         vfree(rx_ring->buffer_info);
1918         rx_ring->buffer_info = NULL;
1919
1920         dma_free_coherent(&pdev->dev, rx_ring->size, rx_ring->desc,
1921                           rx_ring->dma);
1922
1923         rx_ring->desc = NULL;
1924 }
1925
1926 /**
1927  * e1000_free_all_rx_resources - Free Rx Resources for All Queues
1928  * @adapter: board private structure
1929  *
1930  * Free all receive software resources
1931  **/
1932
1933 void e1000_free_all_rx_resources(struct e1000_adapter *adapter)
1934 {
1935         int i;
1936
1937         for (i = 0; i < adapter->num_rx_queues; i++)
1938                 e1000_free_rx_resources(adapter, &adapter->rx_ring[i]);
1939 }
1940
1941 /**
1942  * e1000_clean_rx_ring - Free Rx Buffers per Queue
1943  * @adapter: board private structure
1944  * @rx_ring: ring to free buffers from
1945  **/
1946
1947 static void e1000_clean_rx_ring(struct e1000_adapter *adapter,
1948                                 struct e1000_rx_ring *rx_ring)
1949 {
1950         struct e1000_hw *hw = &adapter->hw;
1951         struct e1000_buffer *buffer_info;
1952         struct pci_dev *pdev = adapter->pdev;
1953         unsigned long size;
1954         unsigned int i;
1955
1956         /* Free all the Rx ring sk_buffs */
1957         for (i = 0; i < rx_ring->count; i++) {
1958                 buffer_info = &rx_ring->buffer_info[i];
1959                 if (buffer_info->dma &&
1960                     adapter->clean_rx == e1000_clean_rx_irq) {
1961                         dma_unmap_single(&pdev->dev, buffer_info->dma,
1962                                          buffer_info->length,
1963                                          DMA_FROM_DEVICE);
1964                 } else if (buffer_info->dma &&
1965                            adapter->clean_rx == e1000_clean_jumbo_rx_irq) {
1966                         dma_unmap_page(&pdev->dev, buffer_info->dma,
1967                                        buffer_info->length,
1968                                        DMA_FROM_DEVICE);
1969                 }
1970
1971                 buffer_info->dma = 0;
1972                 if (buffer_info->page) {
1973                         put_page(buffer_info->page);
1974                         buffer_info->page = NULL;
1975                 }
1976                 if (buffer_info->skb) {
1977                         dev_kfree_skb(buffer_info->skb);
1978                         buffer_info->skb = NULL;
1979                 }
1980         }
1981
1982         /* there also may be some cached data from a chained receive */
1983         if (rx_ring->rx_skb_top) {
1984                 dev_kfree_skb(rx_ring->rx_skb_top);
1985                 rx_ring->rx_skb_top = NULL;
1986         }
1987
1988         size = sizeof(struct e1000_buffer) * rx_ring->count;
1989         memset(rx_ring->buffer_info, 0, size);
1990
1991         /* Zero out the descriptor ring */
1992         memset(rx_ring->desc, 0, rx_ring->size);
1993
1994         rx_ring->next_to_clean = 0;
1995         rx_ring->next_to_use = 0;
1996
1997         writel(0, hw->hw_addr + rx_ring->rdh);
1998         writel(0, hw->hw_addr + rx_ring->rdt);
1999 }
2000
2001 /**
2002  * e1000_clean_all_rx_rings - Free Rx Buffers for all queues
2003  * @adapter: board private structure
2004  **/
2005
2006 static void e1000_clean_all_rx_rings(struct e1000_adapter *adapter)
2007 {
2008         int i;
2009
2010         for (i = 0; i < adapter->num_rx_queues; i++)
2011                 e1000_clean_rx_ring(adapter, &adapter->rx_ring[i]);
2012 }
2013
2014 /* The 82542 2.0 (revision 2) needs to have the receive unit in reset
2015  * and memory write and invalidate disabled for certain operations
2016  */
2017 static void e1000_enter_82542_rst(struct e1000_adapter *adapter)
2018 {
2019         struct e1000_hw *hw = &adapter->hw;
2020         struct net_device *netdev = adapter->netdev;
2021         u32 rctl;
2022
2023         e1000_pci_clear_mwi(hw);
2024
2025         rctl = er32(RCTL);
2026         rctl |= E1000_RCTL_RST;
2027         ew32(RCTL, rctl);
2028         E1000_WRITE_FLUSH();
2029         mdelay(5);
2030
2031         if (netif_running(netdev))
2032                 e1000_clean_all_rx_rings(adapter);
2033 }
2034
2035 static void e1000_leave_82542_rst(struct e1000_adapter *adapter)
2036 {
2037         struct e1000_hw *hw = &adapter->hw;
2038         struct net_device *netdev = adapter->netdev;
2039         u32 rctl;
2040
2041         rctl = er32(RCTL);
2042         rctl &= ~E1000_RCTL_RST;
2043         ew32(RCTL, rctl);
2044         E1000_WRITE_FLUSH();
2045         mdelay(5);
2046
2047         if (hw->pci_cmd_word & PCI_COMMAND_INVALIDATE)
2048                 e1000_pci_set_mwi(hw);
2049
2050         if (netif_running(netdev)) {
2051                 /* No need to loop, because 82542 supports only 1 queue */
2052                 struct e1000_rx_ring *ring = &adapter->rx_ring[0];
2053                 e1000_configure_rx(adapter);
2054                 adapter->alloc_rx_buf(adapter, ring, E1000_DESC_UNUSED(ring));
2055         }
2056 }
2057
2058 /**
2059  * e1000_set_mac - Change the Ethernet Address of the NIC
2060  * @netdev: network interface device structure
2061  * @p: pointer to an address structure
2062  *
2063  * Returns 0 on success, negative on failure
2064  **/
2065
2066 static int e1000_set_mac(struct net_device *netdev, void *p)
2067 {
2068         struct e1000_adapter *adapter = netdev_priv(netdev);
2069         struct e1000_hw *hw = &adapter->hw;
2070         struct sockaddr *addr = p;
2071
2072         if (!is_valid_ether_addr(addr->sa_data))
2073                 return -EADDRNOTAVAIL;
2074
2075         /* 82542 2.0 needs to be in reset to write receive address registers */
2076
2077         if (hw->mac_type == e1000_82542_rev2_0)
2078                 e1000_enter_82542_rst(adapter);
2079
2080         memcpy(netdev->dev_addr, addr->sa_data, netdev->addr_len);
2081         memcpy(hw->mac_addr, addr->sa_data, netdev->addr_len);
2082
2083         e1000_rar_set(hw, hw->mac_addr, 0);
2084
2085         if (hw->mac_type == e1000_82542_rev2_0)
2086                 e1000_leave_82542_rst(adapter);
2087
2088         return 0;
2089 }
2090
2091 /**
2092  * e1000_set_rx_mode - Secondary Unicast, Multicast and Promiscuous mode set
2093  * @netdev: network interface device structure
2094  *
2095  * The set_rx_mode entry point is called whenever the unicast or multicast
2096  * address lists or the network interface flags are updated. This routine is
2097  * responsible for configuring the hardware for proper unicast, multicast,
2098  * promiscuous mode, and all-multi behavior.
2099  **/
2100
2101 static void e1000_set_rx_mode(struct net_device *netdev)
2102 {
2103         struct e1000_adapter *adapter = netdev_priv(netdev);
2104         struct e1000_hw *hw = &adapter->hw;
2105         struct netdev_hw_addr *ha;
2106         bool use_uc = false;
2107         u32 rctl;
2108         u32 hash_value;
2109         int i, rar_entries = E1000_RAR_ENTRIES;
2110         int mta_reg_count = E1000_NUM_MTA_REGISTERS;
2111         u32 *mcarray = kcalloc(mta_reg_count, sizeof(u32), GFP_ATOMIC);
2112
2113         if (!mcarray) {
2114                 e_err("memory allocation failed\n");
2115                 return;
2116         }
2117
2118         /* Check for Promiscuous and All Multicast modes */
2119
2120         rctl = er32(RCTL);
2121
2122         if (netdev->flags & IFF_PROMISC) {
2123                 rctl |= (E1000_RCTL_UPE | E1000_RCTL_MPE);
2124                 rctl &= ~E1000_RCTL_VFE;
2125         } else {
2126                 if (netdev->flags & IFF_ALLMULTI)
2127                         rctl |= E1000_RCTL_MPE;
2128                 else
2129                         rctl &= ~E1000_RCTL_MPE;
2130                 /* Enable VLAN filter if there is a VLAN */
2131                 if (adapter->vlgrp)
2132                         rctl |= E1000_RCTL_VFE;
2133         }
2134
2135         if (netdev_uc_count(netdev) > rar_entries - 1) {
2136                 rctl |= E1000_RCTL_UPE;
2137         } else if (!(netdev->flags & IFF_PROMISC)) {
2138                 rctl &= ~E1000_RCTL_UPE;
2139                 use_uc = true;
2140         }
2141
2142         ew32(RCTL, rctl);
2143
2144         /* 82542 2.0 needs to be in reset to write receive address registers */
2145
2146         if (hw->mac_type == e1000_82542_rev2_0)
2147                 e1000_enter_82542_rst(adapter);
2148
2149         /* load the first 14 addresses into the exact filters 1-14. Unicast
2150          * addresses take precedence to avoid disabling unicast filtering
2151          * when possible.
2152          *
2153          * RAR 0 is used for the station MAC adddress
2154          * if there are not 14 addresses, go ahead and clear the filters
2155          */
2156         i = 1;
2157         if (use_uc)
2158                 netdev_for_each_uc_addr(ha, netdev) {
2159                         if (i == rar_entries)
2160                                 break;
2161                         e1000_rar_set(hw, ha->addr, i++);
2162                 }
2163
2164         netdev_for_each_mc_addr(ha, netdev) {
2165                 if (i == rar_entries) {
2166                         /* load any remaining addresses into the hash table */
2167                         u32 hash_reg, hash_bit, mta;
2168                         hash_value = e1000_hash_mc_addr(hw, ha->addr);
2169                         hash_reg = (hash_value >> 5) & 0x7F;
2170                         hash_bit = hash_value & 0x1F;
2171                         mta = (1 << hash_bit);
2172                         mcarray[hash_reg] |= mta;
2173                 } else {
2174                         e1000_rar_set(hw, ha->addr, i++);
2175                 }
2176         }
2177
2178         for (; i < rar_entries; i++) {
2179                 E1000_WRITE_REG_ARRAY(hw, RA, i << 1, 0);
2180                 E1000_WRITE_FLUSH();
2181                 E1000_WRITE_REG_ARRAY(hw, RA, (i << 1) + 1, 0);
2182                 E1000_WRITE_FLUSH();
2183         }
2184
2185         /* write the hash table completely, write from bottom to avoid
2186          * both stupid write combining chipsets, and flushing each write */
2187         for (i = mta_reg_count - 1; i >= 0 ; i--) {
2188                 /*
2189                  * If we are on an 82544 has an errata where writing odd
2190                  * offsets overwrites the previous even offset, but writing
2191                  * backwards over the range solves the issue by always
2192                  * writing the odd offset first
2193                  */
2194                 E1000_WRITE_REG_ARRAY(hw, MTA, i, mcarray[i]);
2195         }
2196         E1000_WRITE_FLUSH();
2197
2198         if (hw->mac_type == e1000_82542_rev2_0)
2199                 e1000_leave_82542_rst(adapter);
2200
2201         kfree(mcarray);
2202 }
2203
2204 /* Need to wait a few seconds after link up to get diagnostic information from
2205  * the phy */
2206
2207 static void e1000_update_phy_info(unsigned long data)
2208 {
2209         struct e1000_adapter *adapter = (struct e1000_adapter *)data;
2210         struct e1000_hw *hw = &adapter->hw;
2211         e1000_phy_get_info(hw, &adapter->phy_info);
2212 }
2213
2214 /**
2215  * e1000_82547_tx_fifo_stall - Timer Call-back
2216  * @data: pointer to adapter cast into an unsigned long
2217  **/
2218
2219 static void e1000_82547_tx_fifo_stall(unsigned long data)
2220 {
2221         struct e1000_adapter *adapter = (struct e1000_adapter *)data;
2222         struct e1000_hw *hw = &adapter->hw;
2223         struct net_device *netdev = adapter->netdev;
2224         u32 tctl;
2225
2226         if (atomic_read(&adapter->tx_fifo_stall)) {
2227                 if ((er32(TDT) == er32(TDH)) &&
2228                    (er32(TDFT) == er32(TDFH)) &&
2229                    (er32(TDFTS) == er32(TDFHS))) {
2230                         tctl = er32(TCTL);
2231                         ew32(TCTL, tctl & ~E1000_TCTL_EN);
2232                         ew32(TDFT, adapter->tx_head_addr);
2233                         ew32(TDFH, adapter->tx_head_addr);
2234                         ew32(TDFTS, adapter->tx_head_addr);
2235                         ew32(TDFHS, adapter->tx_head_addr);
2236                         ew32(TCTL, tctl);
2237                         E1000_WRITE_FLUSH();
2238
2239                         adapter->tx_fifo_head = 0;
2240                         atomic_set(&adapter->tx_fifo_stall, 0);
2241                         netif_wake_queue(netdev);
2242                 } else if (!test_bit(__E1000_DOWN, &adapter->flags)) {
2243                         mod_timer(&adapter->tx_fifo_stall_timer, jiffies + 1);
2244                 }
2245         }
2246 }
2247
2248 bool e1000_has_link(struct e1000_adapter *adapter)
2249 {
2250         struct e1000_hw *hw = &adapter->hw;
2251         bool link_active = false;
2252
2253         /* get_link_status is set on LSC (link status) interrupt or
2254          * rx sequence error interrupt.  get_link_status will stay
2255          * false until the e1000_check_for_link establishes link
2256          * for copper adapters ONLY
2257          */
2258         switch (hw->media_type) {
2259         case e1000_media_type_copper:
2260                 if (hw->get_link_status) {
2261                         e1000_check_for_link(hw);
2262                         link_active = !hw->get_link_status;
2263                 } else {
2264                         link_active = true;
2265                 }
2266                 break;
2267         case e1000_media_type_fiber:
2268                 e1000_check_for_link(hw);
2269                 link_active = !!(er32(STATUS) & E1000_STATUS_LU);
2270                 break;
2271         case e1000_media_type_internal_serdes:
2272                 e1000_check_for_link(hw);
2273                 link_active = hw->serdes_has_link;
2274                 break;
2275         default:
2276                 break;
2277         }
2278
2279         return link_active;
2280 }
2281
2282 /**
2283  * e1000_watchdog - Timer Call-back
2284  * @data: pointer to adapter cast into an unsigned long
2285  **/
2286 static void e1000_watchdog(unsigned long data)
2287 {
2288         struct e1000_adapter *adapter = (struct e1000_adapter *)data;
2289         struct e1000_hw *hw = &adapter->hw;
2290         struct net_device *netdev = adapter->netdev;
2291         struct e1000_tx_ring *txdr = adapter->tx_ring;
2292         u32 link, tctl;
2293
2294         link = e1000_has_link(adapter);
2295         if ((netif_carrier_ok(netdev)) && link)
2296                 goto link_up;
2297
2298         if (link) {
2299                 if (!netif_carrier_ok(netdev)) {
2300                         u32 ctrl;
2301                         bool txb2b = true;
2302                         /* update snapshot of PHY registers on LSC */
2303                         e1000_get_speed_and_duplex(hw,
2304                                                    &adapter->link_speed,
2305                                                    &adapter->link_duplex);
2306
2307                         ctrl = er32(CTRL);
2308                         pr_info("%s NIC Link is Up %d Mbps %s, "
2309                                 "Flow Control: %s\n",
2310                                 netdev->name,
2311                                 adapter->link_speed,
2312                                 adapter->link_duplex == FULL_DUPLEX ?
2313                                 "Full Duplex" : "Half Duplex",
2314                                 ((ctrl & E1000_CTRL_TFCE) && (ctrl &
2315                                 E1000_CTRL_RFCE)) ? "RX/TX" : ((ctrl &
2316                                 E1000_CTRL_RFCE) ? "RX" : ((ctrl &
2317                                 E1000_CTRL_TFCE) ? "TX" : "None")));
2318
2319                         /* adjust timeout factor according to speed/duplex */
2320                         adapter->tx_timeout_factor = 1;
2321                         switch (adapter->link_speed) {
2322                         case SPEED_10:
2323                                 txb2b = false;
2324                                 adapter->tx_timeout_factor = 16;
2325                                 break;
2326                         case SPEED_100:
2327                                 txb2b = false;
2328                                 /* maybe add some timeout factor ? */
2329                                 break;
2330                         }
2331
2332                         /* enable transmits in the hardware */
2333                         tctl = er32(TCTL);
2334                         tctl |= E1000_TCTL_EN;
2335                         ew32(TCTL, tctl);
2336
2337                         netif_carrier_on(netdev);
2338                         if (!test_bit(__E1000_DOWN, &adapter->flags))
2339                                 mod_timer(&adapter->phy_info_timer,
2340                                           round_jiffies(jiffies + 2 * HZ));
2341                         adapter->smartspeed = 0;
2342                 }
2343         } else {
2344                 if (netif_carrier_ok(netdev)) {
2345                         adapter->link_speed = 0;
2346                         adapter->link_duplex = 0;
2347                         pr_info("%s NIC Link is Down\n",
2348                                 netdev->name);
2349                         netif_carrier_off(netdev);
2350
2351                         if (!test_bit(__E1000_DOWN, &adapter->flags))
2352                                 mod_timer(&adapter->phy_info_timer,
2353                                           round_jiffies(jiffies + 2 * HZ));
2354                 }
2355
2356                 e1000_smartspeed(adapter);
2357         }
2358
2359 link_up:
2360         e1000_update_stats(adapter);
2361
2362         hw->tx_packet_delta = adapter->stats.tpt - adapter->tpt_old;
2363         adapter->tpt_old = adapter->stats.tpt;
2364         hw->collision_delta = adapter->stats.colc - adapter->colc_old;
2365         adapter->colc_old = adapter->stats.colc;
2366
2367         adapter->gorcl = adapter->stats.gorcl - adapter->gorcl_old;
2368         adapter->gorcl_old = adapter->stats.gorcl;
2369         adapter->gotcl = adapter->stats.gotcl - adapter->gotcl_old;
2370         adapter->gotcl_old = adapter->stats.gotcl;
2371
2372         e1000_update_adaptive(hw);
2373
2374         if (!netif_carrier_ok(netdev)) {
2375                 if (E1000_DESC_UNUSED(txdr) + 1 < txdr->count) {
2376                         /* We've lost link, so the controller stops DMA,
2377                          * but we've got queued Tx work that's never going
2378                          * to get done, so reset controller to flush Tx.
2379                          * (Do the reset outside of interrupt context). */
2380                         adapter->tx_timeout_count++;
2381                         schedule_work(&adapter->reset_task);
2382                         /* return immediately since reset is imminent */
2383                         return;
2384                 }
2385         }
2386
2387         /* Simple mode for Interrupt Throttle Rate (ITR) */
2388         if (hw->mac_type >= e1000_82540 && adapter->itr_setting == 4) {
2389                 /*
2390                  * Symmetric Tx/Rx gets a reduced ITR=2000;
2391                  * Total asymmetrical Tx or Rx gets ITR=8000;
2392                  * everyone else is between 2000-8000.
2393                  */
2394                 u32 goc = (adapter->gotcl + adapter->gorcl) / 10000;
2395                 u32 dif = (adapter->gotcl > adapter->gorcl ?
2396                             adapter->gotcl - adapter->gorcl :
2397                             adapter->gorcl - adapter->gotcl) / 10000;
2398                 u32 itr = goc > 0 ? (dif * 6000 / goc + 2000) : 8000;
2399
2400                 ew32(ITR, 1000000000 / (itr * 256));
2401         }
2402
2403         /* Cause software interrupt to ensure rx ring is cleaned */
2404         ew32(ICS, E1000_ICS_RXDMT0);
2405
2406         /* Force detection of hung controller every watchdog period */
2407         adapter->detect_tx_hung = true;
2408
2409         /* Reset the timer */
2410         if (!test_bit(__E1000_DOWN, &adapter->flags))
2411                 mod_timer(&adapter->watchdog_timer,
2412                           round_jiffies(jiffies + 2 * HZ));
2413 }
2414
2415 enum latency_range {
2416         lowest_latency = 0,
2417         low_latency = 1,
2418         bulk_latency = 2,
2419         latency_invalid = 255
2420 };
2421
2422 /**
2423  * e1000_update_itr - update the dynamic ITR value based on statistics
2424  * @adapter: pointer to adapter
2425  * @itr_setting: current adapter->itr
2426  * @packets: the number of packets during this measurement interval
2427  * @bytes: the number of bytes during this measurement interval
2428  *
2429  *      Stores a new ITR value based on packets and byte
2430  *      counts during the last interrupt.  The advantage of per interrupt
2431  *      computation is faster updates and more accurate ITR for the current
2432  *      traffic pattern.  Constants in this function were computed
2433  *      based on theoretical maximum wire speed and thresholds were set based
2434  *      on testing data as well as attempting to minimize response time
2435  *      while increasing bulk throughput.
2436  *      this functionality is controlled by the InterruptThrottleRate module
2437  *      parameter (see e1000_param.c)
2438  **/
2439 static unsigned int e1000_update_itr(struct e1000_adapter *adapter,
2440                                      u16 itr_setting, int packets, int bytes)
2441 {
2442         unsigned int retval = itr_setting;
2443         struct e1000_hw *hw = &adapter->hw;
2444
2445         if (unlikely(hw->mac_type < e1000_82540))
2446                 goto update_itr_done;
2447
2448         if (packets == 0)
2449                 goto update_itr_done;
2450
2451         switch (itr_setting) {
2452         case lowest_latency:
2453                 /* jumbo frames get bulk treatment*/
2454                 if (bytes/packets > 8000)
2455                         retval = bulk_latency;
2456                 else if ((packets < 5) && (bytes > 512))
2457                         retval = low_latency;
2458                 break;
2459         case low_latency:  /* 50 usec aka 20000 ints/s */
2460                 if (bytes > 10000) {
2461                         /* jumbo frames need bulk latency setting */
2462                         if (bytes/packets > 8000)
2463                                 retval = bulk_latency;
2464                         else if ((packets < 10) || ((bytes/packets) > 1200))
2465                                 retval = bulk_latency;
2466                         else if ((packets > 35))
2467                                 retval = lowest_latency;
2468                 } else if (bytes/packets > 2000)
2469                         retval = bulk_latency;
2470                 else if (packets <= 2 && bytes < 512)
2471                         retval = lowest_latency;
2472                 break;
2473         case bulk_latency: /* 250 usec aka 4000 ints/s */
2474                 if (bytes > 25000) {
2475                         if (packets > 35)
2476                                 retval = low_latency;
2477                 } else if (bytes < 6000) {
2478                         retval = low_latency;
2479                 }
2480                 break;
2481         }
2482
2483 update_itr_done:
2484         return retval;
2485 }
2486
2487 static void e1000_set_itr(struct e1000_adapter *adapter)
2488 {
2489         struct e1000_hw *hw = &adapter->hw;
2490         u16 current_itr;
2491         u32 new_itr = adapter->itr;
2492
2493         if (unlikely(hw->mac_type < e1000_82540))
2494                 return;
2495
2496         /* for non-gigabit speeds, just fix the interrupt rate at 4000 */
2497         if (unlikely(adapter->link_speed != SPEED_1000)) {
2498                 current_itr = 0;
2499                 new_itr = 4000;
2500                 goto set_itr_now;
2501         }
2502
2503         adapter->tx_itr = e1000_update_itr(adapter,
2504                                     adapter->tx_itr,
2505                                     adapter->total_tx_packets,
2506                                     adapter->total_tx_bytes);
2507         /* conservative mode (itr 3) eliminates the lowest_latency setting */
2508         if (adapter->itr_setting == 3 && adapter->tx_itr == lowest_latency)
2509                 adapter->tx_itr = low_latency;
2510
2511         adapter->rx_itr = e1000_update_itr(adapter,
2512                                     adapter->rx_itr,
2513                                     adapter->total_rx_packets,
2514                                     adapter->total_rx_bytes);
2515         /* conservative mode (itr 3) eliminates the lowest_latency setting */
2516         if (adapter->itr_setting == 3 && adapter->rx_itr == lowest_latency)
2517                 adapter->rx_itr = low_latency;
2518
2519         current_itr = max(adapter->rx_itr, adapter->tx_itr);
2520
2521         switch (current_itr) {
2522         /* counts and packets in update_itr are dependent on these numbers */
2523         case lowest_latency:
2524                 new_itr = 70000;
2525                 break;
2526         case low_latency:
2527                 new_itr = 20000; /* aka hwitr = ~200 */
2528                 break;
2529         case bulk_latency:
2530                 new_itr = 4000;
2531                 break;
2532         default:
2533                 break;
2534         }
2535
2536 set_itr_now:
2537         if (new_itr != adapter->itr) {
2538                 /* this attempts to bias the interrupt rate towards Bulk
2539                  * by adding intermediate steps when interrupt rate is
2540                  * increasing */
2541                 new_itr = new_itr > adapter->itr ?
2542                              min(adapter->itr + (new_itr >> 2), new_itr) :
2543                              new_itr;
2544                 adapter->itr = new_itr;
2545                 ew32(ITR, 1000000000 / (new_itr * 256));
2546         }
2547 }
2548
2549 #define E1000_TX_FLAGS_CSUM             0x00000001
2550 #define E1000_TX_FLAGS_VLAN             0x00000002
2551 #define E1000_TX_FLAGS_TSO              0x00000004
2552 #define E1000_TX_FLAGS_IPV4             0x00000008
2553 #define E1000_TX_FLAGS_VLAN_MASK        0xffff0000
2554 #define E1000_TX_FLAGS_VLAN_SHIFT       16
2555
2556 static int e1000_tso(struct e1000_adapter *adapter,
2557                      struct e1000_tx_ring *tx_ring, struct sk_buff *skb)
2558 {
2559         struct e1000_context_desc *context_desc;
2560         struct e1000_buffer *buffer_info;
2561         unsigned int i;
2562         u32 cmd_length = 0;
2563         u16 ipcse = 0, tucse, mss;
2564         u8 ipcss, ipcso, tucss, tucso, hdr_len;
2565         int err;
2566
2567         if (skb_is_gso(skb)) {
2568                 if (skb_header_cloned(skb)) {
2569                         err = pskb_expand_head(skb, 0, 0, GFP_ATOMIC);
2570                         if (err)
2571                                 return err;
2572                 }
2573
2574                 hdr_len = skb_transport_offset(skb) + tcp_hdrlen(skb);
2575                 mss = skb_shinfo(skb)->gso_size;
2576                 if (skb->protocol == htons(ETH_P_IP)) {
2577                         struct iphdr *iph = ip_hdr(skb);
2578                         iph->tot_len = 0;
2579                         iph->check = 0;
2580                         tcp_hdr(skb)->check = ~csum_tcpudp_magic(iph->saddr,
2581                                                                  iph->daddr, 0,
2582                                                                  IPPROTO_TCP,
2583                                                                  0);
2584                         cmd_length = E1000_TXD_CMD_IP;
2585                         ipcse = skb_transport_offset(skb) - 1;
2586                 } else if (skb->protocol == htons(ETH_P_IPV6)) {
2587                         ipv6_hdr(skb)->payload_len = 0;
2588                         tcp_hdr(skb)->check =
2589                                 ~csum_ipv6_magic(&ipv6_hdr(skb)->saddr,
2590                                                  &ipv6_hdr(skb)->daddr,
2591                                                  0, IPPROTO_TCP, 0);
2592                         ipcse = 0;
2593                 }
2594                 ipcss = skb_network_offset(skb);
2595                 ipcso = (void *)&(ip_hdr(skb)->check) - (void *)skb->data;
2596                 tucss = skb_transport_offset(skb);
2597                 tucso = (void *)&(tcp_hdr(skb)->check) - (void *)skb->data;
2598                 tucse = 0;
2599
2600                 cmd_length |= (E1000_TXD_CMD_DEXT | E1000_TXD_CMD_TSE |
2601                                E1000_TXD_CMD_TCP | (skb->len - (hdr_len)));
2602
2603                 i = tx_ring->next_to_use;
2604                 context_desc = E1000_CONTEXT_DESC(*tx_ring, i);
2605                 buffer_info = &tx_ring->buffer_info[i];
2606
2607                 context_desc->lower_setup.ip_fields.ipcss  = ipcss;
2608                 context_desc->lower_setup.ip_fields.ipcso  = ipcso;
2609                 context_desc->lower_setup.ip_fields.ipcse  = cpu_to_le16(ipcse);
2610                 context_desc->upper_setup.tcp_fields.tucss = tucss;
2611                 context_desc->upper_setup.tcp_fields.tucso = tucso;
2612                 context_desc->upper_setup.tcp_fields.tucse = cpu_to_le16(tucse);
2613                 context_desc->tcp_seg_setup.fields.mss     = cpu_to_le16(mss);
2614                 context_desc->tcp_seg_setup.fields.hdr_len = hdr_len;
2615                 context_desc->cmd_and_length = cpu_to_le32(cmd_length);
2616
2617                 buffer_info->time_stamp = jiffies;
2618                 buffer_info->next_to_watch = i;
2619
2620                 if (++i == tx_ring->count) i = 0;
2621                 tx_ring->next_to_use = i;
2622
2623                 return true;
2624         }
2625         return false;
2626 }
2627
2628 static bool e1000_tx_csum(struct e1000_adapter *adapter,
2629                           struct e1000_tx_ring *tx_ring, struct sk_buff *skb)
2630 {
2631         struct e1000_context_desc *context_desc;
2632         struct e1000_buffer *buffer_info;
2633         unsigned int i;
2634         u8 css;
2635         u32 cmd_len = E1000_TXD_CMD_DEXT;
2636
2637         if (skb->ip_summed != CHECKSUM_PARTIAL)
2638                 return false;
2639
2640         switch (skb->protocol) {
2641         case cpu_to_be16(ETH_P_IP):
2642                 if (ip_hdr(skb)->protocol == IPPROTO_TCP)
2643                         cmd_len |= E1000_TXD_CMD_TCP;
2644                 break;
2645         case cpu_to_be16(ETH_P_IPV6):
2646                 /* XXX not handling all IPV6 headers */
2647                 if (ipv6_hdr(skb)->nexthdr == IPPROTO_TCP)
2648                         cmd_len |= E1000_TXD_CMD_TCP;
2649                 break;
2650         default:
2651                 if (unlikely(net_ratelimit()))
2652                         e_warn("checksum_partial proto=%x!\n", skb->protocol);
2653                 break;
2654         }
2655
2656         css = skb_transport_offset(skb);
2657
2658         i = tx_ring->next_to_use;
2659         buffer_info = &tx_ring->buffer_info[i];
2660         context_desc = E1000_CONTEXT_DESC(*tx_ring, i);
2661
2662         context_desc->lower_setup.ip_config = 0;
2663         context_desc->upper_setup.tcp_fields.tucss = css;
2664         context_desc->upper_setup.tcp_fields.tucso =
2665                 css + skb->csum_offset;
2666         context_desc->upper_setup.tcp_fields.tucse = 0;
2667         context_desc->tcp_seg_setup.data = 0;
2668         context_desc->cmd_and_length = cpu_to_le32(cmd_len);
2669
2670         buffer_info->time_stamp = jiffies;
2671         buffer_info->next_to_watch = i;
2672
2673         if (unlikely(++i == tx_ring->count)) i = 0;
2674         tx_ring->next_to_use = i;
2675
2676         return true;
2677 }
2678
2679 #define E1000_MAX_TXD_PWR       12
2680 #define E1000_MAX_DATA_PER_TXD  (1<<E1000_MAX_TXD_PWR)
2681
2682 static int e1000_tx_map(struct e1000_adapter *adapter,
2683                         struct e1000_tx_ring *tx_ring,
2684                         struct sk_buff *skb, unsigned int first,
2685                         unsigned int max_per_txd, unsigned int nr_frags,
2686                         unsigned int mss)
2687 {
2688         struct e1000_hw *hw = &adapter->hw;
2689         struct pci_dev *pdev = adapter->pdev;
2690         struct e1000_buffer *buffer_info;
2691         unsigned int len = skb_headlen(skb);
2692         unsigned int offset = 0, size, count = 0, i;
2693         unsigned int f;
2694
2695         i = tx_ring->next_to_use;
2696
2697         while (len) {
2698                 buffer_info = &tx_ring->buffer_info[i];
2699                 size = min(len, max_per_txd);
2700                 /* Workaround for Controller erratum --
2701                  * descriptor for non-tso packet in a linear SKB that follows a
2702                  * tso gets written back prematurely before the data is fully
2703                  * DMA'd to the controller */
2704                 if (!skb->data_len && tx_ring->last_tx_tso &&
2705                     !skb_is_gso(skb)) {
2706                         tx_ring->last_tx_tso = 0;
2707                         size -= 4;
2708                 }
2709
2710                 /* Workaround for premature desc write-backs
2711                  * in TSO mode.  Append 4-byte sentinel desc */
2712                 if (unlikely(mss && !nr_frags && size == len && size > 8))
2713                         size -= 4;
2714                 /* work-around for errata 10 and it applies
2715                  * to all controllers in PCI-X mode
2716                  * The fix is to make sure that the first descriptor of a
2717                  * packet is smaller than 2048 - 16 - 16 (or 2016) bytes
2718                  */
2719                 if (unlikely((hw->bus_type == e1000_bus_type_pcix) &&
2720                                 (size > 2015) && count == 0))
2721                         size = 2015;
2722
2723                 /* Workaround for potential 82544 hang in PCI-X.  Avoid
2724                  * terminating buffers within evenly-aligned dwords. */
2725                 if (unlikely(adapter->pcix_82544 &&
2726                    !((unsigned long)(skb->data + offset + size - 1) & 4) &&
2727                    size > 4))
2728                         size -= 4;
2729
2730                 buffer_info->length = size;
2731                 /* set time_stamp *before* dma to help avoid a possible race */
2732                 buffer_info->time_stamp = jiffies;
2733                 buffer_info->mapped_as_page = false;
2734                 buffer_info->dma = dma_map_single(&pdev->dev,
2735                                                   skb->data + offset,
2736                                                   size, DMA_TO_DEVICE);
2737                 if (dma_mapping_error(&pdev->dev, buffer_info->dma))
2738                         goto dma_error;
2739                 buffer_info->next_to_watch = i;
2740
2741                 len -= size;
2742                 offset += size;
2743                 count++;
2744                 if (len) {
2745                         i++;
2746                         if (unlikely(i == tx_ring->count))
2747                                 i = 0;
2748                 }
2749         }
2750
2751         for (f = 0; f < nr_frags; f++) {
2752                 struct skb_frag_struct *frag;
2753
2754                 frag = &skb_shinfo(skb)->frags[f];
2755                 len = frag->size;
2756                 offset = frag->page_offset;
2757
2758                 while (len) {
2759                         i++;
2760                         if (unlikely(i == tx_ring->count))
2761                                 i = 0;
2762
2763                         buffer_info = &tx_ring->buffer_info[i];
2764                         size = min(len, max_per_txd);
2765                         /* Workaround for premature desc write-backs
2766                          * in TSO mode.  Append 4-byte sentinel desc */
2767                         if (unlikely(mss && f == (nr_frags-1) && size == len && size > 8))
2768                                 size -= 4;
2769                         /* Workaround for potential 82544 hang in PCI-X.
2770                          * Avoid terminating buffers within evenly-aligned
2771                          * dwords. */
2772                         if (unlikely(adapter->pcix_82544 &&
2773                             !((unsigned long)(page_to_phys(frag->page) + offset
2774                                               + size - 1) & 4) &&
2775                             size > 4))
2776                                 size -= 4;
2777
2778                         buffer_info->length = size;
2779                         buffer_info->time_stamp = jiffies;
2780                         buffer_info->mapped_as_page = true;
2781                         buffer_info->dma = dma_map_page(&pdev->dev, frag->page,
2782                                                         offset, size,
2783                                                         DMA_TO_DEVICE);
2784                         if (dma_mapping_error(&pdev->dev, buffer_info->dma))
2785                                 goto dma_error;
2786                         buffer_info->next_to_watch = i;
2787
2788                         len -= size;
2789                         offset += size;
2790                         count++;
2791                 }
2792         }
2793
2794         tx_ring->buffer_info[i].skb = skb;
2795         tx_ring->buffer_info[first].next_to_watch = i;
2796
2797         return count;
2798
2799 dma_error:
2800         dev_err(&pdev->dev, "TX DMA map failed\n");
2801         buffer_info->dma = 0;
2802         if (count)
2803                 count--;
2804
2805         while (count--) {
2806                 if (i==0)
2807                         i += tx_ring->count;
2808                 i--;
2809                 buffer_info = &tx_ring->buffer_info[i];
2810                 e1000_unmap_and_free_tx_resource(adapter, buffer_info);
2811         }
2812
2813         return 0;
2814 }
2815
2816 static void e1000_tx_queue(struct e1000_adapter *adapter,
2817                            struct e1000_tx_ring *tx_ring, int tx_flags,
2818                            int count)
2819 {
2820         struct e1000_hw *hw = &adapter->hw;
2821         struct e1000_tx_desc *tx_desc = NULL;
2822         struct e1000_buffer *buffer_info;
2823         u32 txd_upper = 0, txd_lower = E1000_TXD_CMD_IFCS;
2824         unsigned int i;
2825
2826         if (likely(tx_flags & E1000_TX_FLAGS_TSO)) {
2827                 txd_lower |= E1000_TXD_CMD_DEXT | E1000_TXD_DTYP_D |
2828                              E1000_TXD_CMD_TSE;
2829                 txd_upper |= E1000_TXD_POPTS_TXSM << 8;
2830
2831                 if (likely(tx_flags & E1000_TX_FLAGS_IPV4))
2832                         txd_upper |= E1000_TXD_POPTS_IXSM << 8;
2833         }
2834
2835         if (likely(tx_flags & E1000_TX_FLAGS_CSUM)) {
2836                 txd_lower |= E1000_TXD_CMD_DEXT | E1000_TXD_DTYP_D;
2837                 txd_upper |= E1000_TXD_POPTS_TXSM << 8;
2838         }
2839
2840         if (unlikely(tx_flags & E1000_TX_FLAGS_VLAN)) {
2841                 txd_lower |= E1000_TXD_CMD_VLE;
2842                 txd_upper |= (tx_flags & E1000_TX_FLAGS_VLAN_MASK);
2843         }
2844
2845         i = tx_ring->next_to_use;
2846
2847         while (count--) {
2848                 buffer_info = &tx_ring->buffer_info[i];
2849                 tx_desc = E1000_TX_DESC(*tx_ring, i);
2850                 tx_desc->buffer_addr = cpu_to_le64(buffer_info->dma);
2851                 tx_desc->lower.data =
2852                         cpu_to_le32(txd_lower | buffer_info->length);
2853                 tx_desc->upper.data = cpu_to_le32(txd_upper);
2854                 if (unlikely(++i == tx_ring->count)) i = 0;
2855         }
2856
2857         tx_desc->lower.data |= cpu_to_le32(adapter->txd_cmd);
2858
2859         /* Force memory writes to complete before letting h/w
2860          * know there are new descriptors to fetch.  (Only
2861          * applicable for weak-ordered memory model archs,
2862          * such as IA-64). */
2863         wmb();
2864
2865         tx_ring->next_to_use = i;
2866         writel(i, hw->hw_addr + tx_ring->tdt);
2867         /* we need this if more than one processor can write to our tail
2868          * at a time, it syncronizes IO on IA64/Altix systems */
2869         mmiowb();
2870 }
2871
2872 /**
2873  * 82547 workaround to avoid controller hang in half-duplex environment.
2874  * The workaround is to avoid queuing a large packet that would span
2875  * the internal Tx FIFO ring boundary by notifying the stack to resend
2876  * the packet at a later time.  This gives the Tx FIFO an opportunity to
2877  * flush all packets.  When that occurs, we reset the Tx FIFO pointers
2878  * to the beginning of the Tx FIFO.
2879  **/
2880
2881 #define E1000_FIFO_HDR                  0x10
2882 #define E1000_82547_PAD_LEN             0x3E0
2883
2884 static int e1000_82547_fifo_workaround(struct e1000_adapter *adapter,
2885                                        struct sk_buff *skb)
2886 {
2887         u32 fifo_space = adapter->tx_fifo_size - adapter->tx_fifo_head;
2888         u32 skb_fifo_len = skb->len + E1000_FIFO_HDR;
2889
2890         skb_fifo_len = ALIGN(skb_fifo_len, E1000_FIFO_HDR);
2891
2892         if (adapter->link_duplex != HALF_DUPLEX)
2893                 goto no_fifo_stall_required;
2894
2895         if (atomic_read(&adapter->tx_fifo_stall))
2896                 return 1;
2897
2898         if (skb_fifo_len >= (E1000_82547_PAD_LEN + fifo_space)) {
2899                 atomic_set(&adapter->tx_fifo_stall, 1);
2900                 return 1;
2901         }
2902
2903 no_fifo_stall_required:
2904         adapter->tx_fifo_head += skb_fifo_len;
2905         if (adapter->tx_fifo_head >= adapter->tx_fifo_size)
2906                 adapter->tx_fifo_head -= adapter->tx_fifo_size;
2907         return 0;
2908 }
2909
2910 static int __e1000_maybe_stop_tx(struct net_device *netdev, int size)
2911 {
2912         struct e1000_adapter *adapter = netdev_priv(netdev);
2913         struct e1000_tx_ring *tx_ring = adapter->tx_ring;
2914
2915         netif_stop_queue(netdev);
2916         /* Herbert's original patch had:
2917          *  smp_mb__after_netif_stop_queue();
2918          * but since that doesn't exist yet, just open code it. */
2919         smp_mb();
2920
2921         /* We need to check again in a case another CPU has just
2922          * made room available. */
2923         if (likely(E1000_DESC_UNUSED(tx_ring) < size))
2924                 return -EBUSY;
2925
2926         /* A reprieve! */
2927         netif_start_queue(netdev);
2928         ++adapter->restart_queue;
2929         return 0;
2930 }
2931
2932 static int e1000_maybe_stop_tx(struct net_device *netdev,
2933                                struct e1000_tx_ring *tx_ring, int size)
2934 {
2935         if (likely(E1000_DESC_UNUSED(tx_ring) >= size))
2936                 return 0;
2937         return __e1000_maybe_stop_tx(netdev, size);
2938 }
2939
2940 #define TXD_USE_COUNT(S, X) (((S) >> (X)) + 1 )
2941 static netdev_tx_t e1000_xmit_frame(struct sk_buff *skb,
2942                                     struct net_device *netdev)
2943 {
2944         struct e1000_adapter *adapter = netdev_priv(netdev);
2945         struct e1000_hw *hw = &adapter->hw;
2946         struct e1000_tx_ring *tx_ring;
2947         unsigned int first, max_per_txd = E1000_MAX_DATA_PER_TXD;
2948         unsigned int max_txd_pwr = E1000_MAX_TXD_PWR;
2949         unsigned int tx_flags = 0;
2950         unsigned int len = skb_headlen(skb);
2951         unsigned int nr_frags;
2952         unsigned int mss;
2953         int count = 0;
2954         int tso;
2955         unsigned int f;
2956
2957         /* This goes back to the question of how to logically map a tx queue
2958          * to a flow.  Right now, performance is impacted slightly negatively
2959          * if using multiple tx queues.  If the stack breaks away from a
2960          * single qdisc implementation, we can look at this again. */
2961         tx_ring = adapter->tx_ring;
2962
2963         if (unlikely(skb->len <= 0)) {
2964                 dev_kfree_skb_any(skb);
2965                 return NETDEV_TX_OK;
2966         }
2967
2968         mss = skb_shinfo(skb)->gso_size;
2969         /* The controller does a simple calculation to
2970          * make sure there is enough room in the FIFO before
2971          * initiating the DMA for each buffer.  The calc is:
2972          * 4 = ceil(buffer len/mss).  To make sure we don't
2973          * overrun the FIFO, adjust the max buffer len if mss
2974          * drops. */
2975         if (mss) {
2976                 u8 hdr_len;
2977                 max_per_txd = min(mss << 2, max_per_txd);
2978                 max_txd_pwr = fls(max_per_txd) - 1;
2979
2980                 hdr_len = skb_transport_offset(skb) + tcp_hdrlen(skb);
2981                 if (skb->data_len && hdr_len == len) {
2982                         switch (hw->mac_type) {
2983                                 unsigned int pull_size;
2984                         case e1000_82544:
2985                                 /* Make sure we have room to chop off 4 bytes,
2986                                  * and that the end alignment will work out to
2987                                  * this hardware's requirements
2988                                  * NOTE: this is a TSO only workaround
2989                                  * if end byte alignment not correct move us
2990                                  * into the next dword */
2991                                 if ((unsigned long)(skb_tail_pointer(skb) - 1) & 4)
2992                                         break;
2993                                 /* fall through */
2994                                 pull_size = min((unsigned int)4, skb->data_len);
2995                                 if (!__pskb_pull_tail(skb, pull_size)) {
2996                                         e_err("__pskb_pull_tail failed.\n");
2997                                         dev_kfree_skb_any(skb);
2998                                         return NETDEV_TX_OK;
2999                                 }
3000                                 len = skb_headlen(skb);
3001                                 break;
3002                         default:
3003                                 /* do nothing */
3004                                 break;
3005                         }
3006                 }
3007         }
3008
3009         /* reserve a descriptor for the offload context */
3010         if ((mss) || (skb->ip_summed == CHECKSUM_PARTIAL))
3011                 count++;
3012         count++;
3013
3014         /* Controller Erratum workaround */
3015         if (!skb->data_len && tx_ring->last_tx_tso && !skb_is_gso(skb))
3016                 count++;
3017
3018         count += TXD_USE_COUNT(len, max_txd_pwr);
3019
3020         if (adapter->pcix_82544)
3021                 count++;
3022
3023         /* work-around for errata 10 and it applies to all controllers
3024          * in PCI-X mode, so add one more descriptor to the count
3025          */
3026         if (unlikely((hw->bus_type == e1000_bus_type_pcix) &&
3027                         (len > 2015)))
3028                 count++;
3029
3030         nr_frags = skb_shinfo(skb)->nr_frags;
3031         for (f = 0; f < nr_frags; f++)
3032                 count += TXD_USE_COUNT(skb_shinfo(skb)->frags[f].size,
3033                                        max_txd_pwr);
3034         if (adapter->pcix_82544)
3035                 count += nr_frags;
3036
3037         /* need: count + 2 desc gap to keep tail from touching
3038          * head, otherwise try next time */
3039         if (unlikely(e1000_maybe_stop_tx(netdev, tx_ring, count + 2)))
3040                 return NETDEV_TX_BUSY;
3041
3042         if (unlikely(hw->mac_type == e1000_82547)) {
3043                 if (unlikely(e1000_82547_fifo_workaround(adapter, skb))) {
3044                         netif_stop_queue(netdev);
3045                         if (!test_bit(__E1000_DOWN, &adapter->flags))
3046                                 mod_timer(&adapter->tx_fifo_stall_timer,
3047                                           jiffies + 1);
3048                         return NETDEV_TX_BUSY;
3049                 }
3050         }
3051
3052         if (unlikely(adapter->vlgrp && vlan_tx_tag_present(skb))) {
3053                 tx_flags |= E1000_TX_FLAGS_VLAN;
3054                 tx_flags |= (vlan_tx_tag_get(skb) << E1000_TX_FLAGS_VLAN_SHIFT);
3055         }
3056
3057         first = tx_ring->next_to_use;
3058
3059         tso = e1000_tso(adapter, tx_ring, skb);
3060         if (tso < 0) {
3061                 dev_kfree_skb_any(skb);
3062                 return NETDEV_TX_OK;
3063         }
3064
3065         if (likely(tso)) {
3066                 if (likely(hw->mac_type != e1000_82544))
3067                         tx_ring->last_tx_tso = 1;
3068                 tx_flags |= E1000_TX_FLAGS_TSO;
3069         } else if (likely(e1000_tx_csum(adapter, tx_ring, skb)))
3070                 tx_flags |= E1000_TX_FLAGS_CSUM;
3071
3072         if (likely(skb->protocol == htons(ETH_P_IP)))
3073                 tx_flags |= E1000_TX_FLAGS_IPV4;
3074
3075         count = e1000_tx_map(adapter, tx_ring, skb, first, max_per_txd,
3076                              nr_frags, mss);
3077
3078         if (count) {
3079                 e1000_tx_queue(adapter, tx_ring, tx_flags, count);
3080                 /* Make sure there is space in the ring for the next send. */
3081                 e1000_maybe_stop_tx(netdev, tx_ring, MAX_SKB_FRAGS + 2);
3082
3083         } else {
3084                 dev_kfree_skb_any(skb);
3085                 tx_ring->buffer_info[first].time_stamp = 0;
3086                 tx_ring->next_to_use = first;
3087         }
3088
3089         return NETDEV_TX_OK;
3090 }
3091
3092 /**
3093  * e1000_tx_timeout - Respond to a Tx Hang
3094  * @netdev: network interface device structure
3095  **/
3096
3097 static void e1000_tx_timeout(struct net_device *netdev)
3098 {
3099         struct e1000_adapter *adapter = netdev_priv(netdev);
3100
3101         /* Do the reset outside of interrupt context */
3102         adapter->tx_timeout_count++;
3103         schedule_work(&adapter->reset_task);
3104 }
3105
3106 static void e1000_reset_task(struct work_struct *work)
3107 {
3108         struct e1000_adapter *adapter =
3109                 container_of(work, struct e1000_adapter, reset_task);
3110
3111         e1000_reinit_locked(adapter);
3112 }
3113
3114 /**
3115  * e1000_get_stats - Get System Network Statistics
3116  * @netdev: network interface device structure
3117  *
3118  * Returns the address of the device statistics structure.
3119  * The statistics are actually updated from the timer callback.
3120  **/
3121
3122 static struct net_device_stats *e1000_get_stats(struct net_device *netdev)
3123 {
3124         /* only return the current stats */
3125         return &netdev->stats;
3126 }
3127
3128 /**
3129  * e1000_change_mtu - Change the Maximum Transfer Unit
3130  * @netdev: network interface device structure
3131  * @new_mtu: new value for maximum frame size
3132  *
3133  * Returns 0 on success, negative on failure
3134  **/
3135
3136 static int e1000_change_mtu(struct net_device *netdev, int new_mtu)
3137 {
3138         struct e1000_adapter *adapter = netdev_priv(netdev);
3139         struct e1000_hw *hw = &adapter->hw;
3140         int max_frame = new_mtu + ENET_HEADER_SIZE + ETHERNET_FCS_SIZE;
3141
3142         if ((max_frame < MINIMUM_ETHERNET_FRAME_SIZE) ||
3143             (max_frame > MAX_JUMBO_FRAME_SIZE)) {
3144                 e_err("Invalid MTU setting\n");
3145                 return -EINVAL;
3146         }
3147
3148         /* Adapter-specific max frame size limits. */
3149         switch (hw->mac_type) {
3150         case e1000_undefined ... e1000_82542_rev2_1:
3151                 if (max_frame > (ETH_FRAME_LEN + ETH_FCS_LEN)) {
3152                         e_err("Jumbo Frames not supported.\n");
3153                         return -EINVAL;
3154                 }
3155                 break;
3156         default:
3157                 /* Capable of supporting up to MAX_JUMBO_FRAME_SIZE limit. */
3158                 break;
3159         }
3160
3161         while (test_and_set_bit(__E1000_RESETTING, &adapter->flags))
3162                 msleep(1);
3163         /* e1000_down has a dependency on max_frame_size */
3164         hw->max_frame_size = max_frame;
3165         if (netif_running(netdev))
3166                 e1000_down(adapter);
3167
3168         /* NOTE: netdev_alloc_skb reserves 16 bytes, and typically NET_IP_ALIGN
3169          * means we reserve 2 more, this pushes us to allocate from the next
3170          * larger slab size.
3171          * i.e. RXBUFFER_2048 --> size-4096 slab
3172          *  however with the new *_jumbo_rx* routines, jumbo receives will use
3173          *  fragmented skbs */
3174
3175         if (max_frame <= E1000_RXBUFFER_2048)
3176                 adapter->rx_buffer_len = E1000_RXBUFFER_2048;
3177         else
3178 #if (PAGE_SIZE >= E1000_RXBUFFER_16384)
3179                 adapter->rx_buffer_len = E1000_RXBUFFER_16384;
3180 #elif (PAGE_SIZE >= E1000_RXBUFFER_4096)
3181                 adapter->rx_buffer_len = PAGE_SIZE;
3182 #endif
3183
3184         /* adjust allocation if LPE protects us, and we aren't using SBP */
3185         if (!hw->tbi_compatibility_on &&
3186             ((max_frame == (ETH_FRAME_LEN + ETH_FCS_LEN)) ||
3187              (max_frame == MAXIMUM_ETHERNET_VLAN_SIZE)))
3188                 adapter->rx_buffer_len = MAXIMUM_ETHERNET_VLAN_SIZE;
3189
3190         pr_info("%s changing MTU from %d to %d\n",
3191                 netdev->name, netdev->mtu, new_mtu);
3192         netdev->mtu = new_mtu;
3193
3194         if (netif_running(netdev))
3195                 e1000_up(adapter);
3196         else
3197                 e1000_reset(adapter);
3198
3199         clear_bit(__E1000_RESETTING, &adapter->flags);
3200
3201         return 0;
3202 }
3203
3204 /**
3205  * e1000_update_stats - Update the board statistics counters
3206  * @adapter: board private structure
3207  **/
3208
3209 void e1000_update_stats(struct e1000_adapter *adapter)
3210 {
3211         struct net_device *netdev = adapter->netdev;
3212         struct e1000_hw *hw = &adapter->hw;
3213         struct pci_dev *pdev = adapter->pdev;
3214         unsigned long flags;
3215         u16 phy_tmp;
3216
3217 #define PHY_IDLE_ERROR_COUNT_MASK 0x00FF
3218
3219         /*
3220          * Prevent stats update while adapter is being reset, or if the pci
3221          * connection is down.
3222          */
3223         if (adapter->link_speed == 0)
3224                 return;
3225         if (pci_channel_offline(pdev))
3226                 return;
3227
3228         spin_lock_irqsave(&adapter->stats_lock, flags);
3229
3230         /* these counters are modified from e1000_tbi_adjust_stats,
3231          * called from the interrupt context, so they must only
3232          * be written while holding adapter->stats_lock
3233          */
3234
3235         adapter->stats.crcerrs += er32(CRCERRS);
3236         adapter->stats.gprc += er32(GPRC);
3237         adapter->stats.gorcl += er32(GORCL);
3238         adapter->stats.gorch += er32(GORCH);
3239         adapter->stats.bprc += er32(BPRC);
3240         adapter->stats.mprc += er32(MPRC);
3241         adapter->stats.roc += er32(ROC);
3242
3243         adapter->stats.prc64 += er32(PRC64);
3244         adapter->stats.prc127 += er32(PRC127);
3245         adapter->stats.prc255 += er32(PRC255);
3246         adapter->stats.prc511 += er32(PRC511);
3247         adapter->stats.prc1023 += er32(PRC1023);
3248         adapter->stats.prc1522 += er32(PRC1522);
3249
3250         adapter->stats.symerrs += er32(SYMERRS);
3251         adapter->stats.mpc += er32(MPC);
3252         adapter->stats.scc += er32(SCC);
3253         adapter->stats.ecol += er32(ECOL);
3254         adapter->stats.mcc += er32(MCC);
3255         adapter->stats.latecol += er32(LATECOL);
3256         adapter->stats.dc += er32(DC);
3257         adapter->stats.sec += er32(SEC);
3258         adapter->stats.rlec += er32(RLEC);
3259         adapter->stats.xonrxc += er32(XONRXC);
3260         adapter->stats.xontxc += er32(XONTXC);
3261         adapter->stats.xoffrxc += er32(XOFFRXC);
3262         adapter->stats.xofftxc += er32(XOFFTXC);
3263         adapter->stats.fcruc += er32(FCRUC);
3264         adapter->stats.gptc += er32(GPTC);
3265         adapter->stats.gotcl += er32(GOTCL);
3266         adapter->stats.gotch += er32(GOTCH);
3267         adapter->stats.rnbc += er32(RNBC);
3268         adapter->stats.ruc += er32(RUC);
3269         adapter->stats.rfc += er32(RFC);
3270         adapter->stats.rjc += er32(RJC);
3271         adapter->stats.torl += er32(TORL);
3272         adapter->stats.torh += er32(TORH);
3273         adapter->stats.totl += er32(TOTL);
3274         adapter->stats.toth += er32(TOTH);
3275         adapter->stats.tpr += er32(TPR);
3276
3277         adapter->stats.ptc64 += er32(PTC64);
3278         adapter->stats.ptc127 += er32(PTC127);
3279         adapter->stats.ptc255 += er32(PTC255);
3280         adapter->stats.ptc511 += er32(PTC511);
3281         adapter->stats.ptc1023 += er32(PTC1023);
3282         adapter->stats.ptc1522 += er32(PTC1522);
3283
3284         adapter->stats.mptc += er32(MPTC);
3285         adapter->stats.bptc += er32(BPTC);
3286
3287         /* used for adaptive IFS */
3288
3289         hw->tx_packet_delta = er32(TPT);
3290         adapter->stats.tpt += hw->tx_packet_delta;
3291         hw->collision_delta = er32(COLC);
3292         adapter->stats.colc += hw->collision_delta;
3293
3294         if (hw->mac_type >= e1000_82543) {
3295                 adapter->stats.algnerrc += er32(ALGNERRC);
3296                 adapter->stats.rxerrc += er32(RXERRC);
3297                 adapter->stats.tncrs += er32(TNCRS);
3298                 adapter->stats.cexterr += er32(CEXTERR);
3299                 adapter->stats.tsctc += er32(TSCTC);
3300                 adapter->stats.tsctfc += er32(TSCTFC);
3301         }
3302
3303         /* Fill out the OS statistics structure */
3304         netdev->stats.multicast = adapter->stats.mprc;
3305         netdev->stats.collisions = adapter->stats.colc;
3306
3307         /* Rx Errors */
3308
3309         /* RLEC on some newer hardware can be incorrect so build
3310         * our own version based on RUC and ROC */
3311         netdev->stats.rx_errors = adapter->stats.rxerrc +
3312                 adapter->stats.crcerrs + adapter->stats.algnerrc +
3313                 adapter->stats.ruc + adapter->stats.roc +
3314                 adapter->stats.cexterr;
3315         adapter->stats.rlerrc = adapter->stats.ruc + adapter->stats.roc;
3316         netdev->stats.rx_length_errors = adapter->stats.rlerrc;
3317         netdev->stats.rx_crc_errors = adapter->stats.crcerrs;
3318         netdev->stats.rx_frame_errors = adapter->stats.algnerrc;
3319         netdev->stats.rx_missed_errors = adapter->stats.mpc;
3320
3321         /* Tx Errors */
3322         adapter->stats.txerrc = adapter->stats.ecol + adapter->stats.latecol;
3323         netdev->stats.tx_errors = adapter->stats.txerrc;
3324         netdev->stats.tx_aborted_errors = adapter->stats.ecol;
3325         netdev->stats.tx_window_errors = adapter->stats.latecol;
3326         netdev->stats.tx_carrier_errors = adapter->stats.tncrs;
3327         if (hw->bad_tx_carr_stats_fd &&
3328             adapter->link_duplex == FULL_DUPLEX) {
3329                 netdev->stats.tx_carrier_errors = 0;
3330                 adapter->stats.tncrs = 0;
3331         }
3332
3333         /* Tx Dropped needs to be maintained elsewhere */
3334
3335         /* Phy Stats */
3336         if (hw->media_type == e1000_media_type_copper) {
3337                 if ((adapter->link_speed == SPEED_1000) &&
3338                    (!e1000_read_phy_reg(hw, PHY_1000T_STATUS, &phy_tmp))) {
3339                         phy_tmp &= PHY_IDLE_ERROR_COUNT_MASK;
3340                         adapter->phy_stats.idle_errors += phy_tmp;
3341                 }
3342
3343                 if ((hw->mac_type <= e1000_82546) &&
3344                    (hw->phy_type == e1000_phy_m88) &&
3345                    !e1000_read_phy_reg(hw, M88E1000_RX_ERR_CNTR, &phy_tmp))
3346                         adapter->phy_stats.receive_errors += phy_tmp;
3347         }
3348
3349         /* Management Stats */
3350         if (hw->has_smbus) {
3351                 adapter->stats.mgptc += er32(MGTPTC);
3352                 adapter->stats.mgprc += er32(MGTPRC);
3353                 adapter->stats.mgpdc += er32(MGTPDC);
3354         }
3355
3356         spin_unlock_irqrestore(&adapter->stats_lock, flags);
3357 }
3358
3359 /**
3360  * e1000_intr - Interrupt Handler
3361  * @irq: interrupt number
3362  * @data: pointer to a network interface device structure
3363  **/
3364
3365 static irqreturn_t e1000_intr(int irq, void *data)
3366 {
3367         struct net_device *netdev = data;
3368         struct e1000_adapter *adapter = netdev_priv(netdev);
3369         struct e1000_hw *hw = &adapter->hw;
3370         u32 icr = er32(ICR);
3371
3372         if (unlikely((!icr) || test_bit(__E1000_DOWN, &adapter->flags)))
3373                 return IRQ_NONE;  /* Not our interrupt */
3374
3375         if (unlikely(icr & (E1000_ICR_RXSEQ | E1000_ICR_LSC))) {
3376                 hw->get_link_status = 1;
3377                 /* guard against interrupt when we're going down */
3378                 if (!test_bit(__E1000_DOWN, &adapter->flags))
3379                         mod_timer(&adapter->watchdog_timer, jiffies + 1);
3380         }
3381
3382         /* disable interrupts, without the synchronize_irq bit */
3383         ew32(IMC, ~0);
3384         E1000_WRITE_FLUSH();
3385
3386         if (likely(napi_schedule_prep(&adapter->napi))) {
3387                 adapter->total_tx_bytes = 0;
3388                 adapter->total_tx_packets = 0;
3389                 adapter->total_rx_bytes = 0;
3390                 adapter->total_rx_packets = 0;
3391                 __napi_schedule(&adapter->napi);
3392         } else {
3393                 /* this really should not happen! if it does it is basically a
3394                  * bug, but not a hard error, so enable ints and continue */
3395                 if (!test_bit(__E1000_DOWN, &adapter->flags))
3396                         e1000_irq_enable(adapter);
3397         }
3398
3399         return IRQ_HANDLED;
3400 }
3401
3402 /**
3403  * e1000_clean - NAPI Rx polling callback
3404  * @adapter: board private structure
3405  **/
3406 static int e1000_clean(struct napi_struct *napi, int budget)
3407 {
3408         struct e1000_adapter *adapter = container_of(napi, struct e1000_adapter, napi);
3409         int tx_clean_complete = 0, work_done = 0;
3410
3411         tx_clean_complete = e1000_clean_tx_irq(adapter, &adapter->tx_ring[0]);
3412
3413         adapter->clean_rx(adapter, &adapter->rx_ring[0], &work_done, budget);
3414
3415         if (!tx_clean_complete)
3416                 work_done = budget;
3417
3418         /* If budget not fully consumed, exit the polling mode */
3419         if (work_done < budget) {
3420                 if (likely(adapter->itr_setting & 3))
3421                         e1000_set_itr(adapter);
3422                 napi_complete(napi);
3423                 if (!test_bit(__E1000_DOWN, &adapter->flags))
3424                         e1000_irq_enable(adapter);
3425         }
3426
3427         return work_done;
3428 }
3429
3430 /**
3431  * e1000_clean_tx_irq - Reclaim resources after transmit completes
3432  * @adapter: board private structure
3433  **/
3434 static bool e1000_clean_tx_irq(struct e1000_adapter *adapter,
3435                                struct e1000_tx_ring *tx_ring)
3436 {
3437         struct e1000_hw *hw = &adapter->hw;
3438         struct net_device *netdev = adapter->netdev;
3439         struct e1000_tx_desc *tx_desc, *eop_desc;
3440         struct e1000_buffer *buffer_info;
3441         unsigned int i, eop;
3442         unsigned int count = 0;
3443         unsigned int total_tx_bytes=0, total_tx_packets=0;
3444
3445         i = tx_ring->next_to_clean;
3446         eop = tx_ring->buffer_info[i].next_to_watch;
3447         eop_desc = E1000_TX_DESC(*tx_ring, eop);
3448
3449         while ((eop_desc->upper.data & cpu_to_le32(E1000_TXD_STAT_DD)) &&
3450                (count < tx_ring->count)) {
3451                 bool cleaned = false;
3452                 for ( ; !cleaned; count++) {
3453                         tx_desc = E1000_TX_DESC(*tx_ring, i);
3454                         buffer_info = &tx_ring->buffer_info[i];
3455                         cleaned = (i == eop);
3456
3457                         if (cleaned) {
3458                                 struct sk_buff *skb = buffer_info->skb;
3459                                 unsigned int segs, bytecount;
3460                                 segs = skb_shinfo(skb)->gso_segs ?: 1;
3461                                 /* multiply data chunks by size of headers */
3462                                 bytecount = ((segs - 1) * skb_headlen(skb)) +
3463                                             skb->len;
3464                                 total_tx_packets += segs;
3465                                 total_tx_bytes += bytecount;
3466                         }
3467                         e1000_unmap_and_free_tx_resource(adapter, buffer_info);
3468                         tx_desc->upper.data = 0;
3469
3470                         if (unlikely(++i == tx_ring->count)) i = 0;
3471                 }
3472
3473                 eop = tx_ring->buffer_info[i].next_to_watch;
3474                 eop_desc = E1000_TX_DESC(*tx_ring, eop);
3475         }
3476
3477         tx_ring->next_to_clean = i;
3478
3479 #define TX_WAKE_THRESHOLD 32
3480         if (unlikely(count && netif_carrier_ok(netdev) &&
3481                      E1000_DESC_UNUSED(tx_ring) >= TX_WAKE_THRESHOLD)) {
3482                 /* Make sure that anybody stopping the queue after this
3483                  * sees the new next_to_clean.
3484                  */
3485                 smp_mb();
3486
3487                 if (netif_queue_stopped(netdev) &&
3488                     !(test_bit(__E1000_DOWN, &adapter->flags))) {
3489                         netif_wake_queue(netdev);
3490                         ++adapter->restart_queue;
3491                 }
3492         }
3493
3494         if (adapter->detect_tx_hung) {
3495                 /* Detect a transmit hang in hardware, this serializes the
3496                  * check with the clearing of time_stamp and movement of i */
3497                 adapter->detect_tx_hung = false;
3498                 if (tx_ring->buffer_info[eop].time_stamp &&
3499                     time_after(jiffies, tx_ring->buffer_info[eop].time_stamp +
3500                                (adapter->tx_timeout_factor * HZ)) &&
3501                     !(er32(STATUS) & E1000_STATUS_TXOFF)) {
3502
3503                         /* detected Tx unit hang */
3504                         e_err("Detected Tx Unit Hang\n"
3505                               "  Tx Queue             <%lu>\n"
3506                               "  TDH                  <%x>\n"
3507                               "  TDT                  <%x>\n"
3508                               "  next_to_use          <%x>\n"
3509                               "  next_to_clean        <%x>\n"
3510                               "buffer_info[next_to_clean]\n"
3511                               "  time_stamp           <%lx>\n"
3512                               "  next_to_watch        <%x>\n"
3513                               "  jiffies              <%lx>\n"
3514                               "  next_to_watch.status <%x>\n",
3515                                 (unsigned long)((tx_ring - adapter->tx_ring) /
3516                                         sizeof(struct e1000_tx_ring)),
3517                                 readl(hw->hw_addr + tx_ring->tdh),
3518                                 readl(hw->hw_addr + tx_ring->tdt),
3519                                 tx_ring->next_to_use,
3520                                 tx_ring->next_to_clean,
3521                                 tx_ring->buffer_info[eop].time_stamp,
3522                                 eop,
3523                                 jiffies,
3524                                 eop_desc->upper.fields.status);
3525                         netif_stop_queue(netdev);
3526                 }
3527         }
3528         adapter->total_tx_bytes += total_tx_bytes;
3529         adapter->total_tx_packets += total_tx_packets;
3530         netdev->stats.tx_bytes += total_tx_bytes;
3531         netdev->stats.tx_packets += total_tx_packets;
3532         return (count < tx_ring->count);
3533 }
3534
3535 /**
3536  * e1000_rx_checksum - Receive Checksum Offload for 82543
3537  * @adapter:     board private structure
3538  * @status_err:  receive descriptor status and error fields
3539  * @csum:        receive descriptor csum field
3540  * @sk_buff:     socket buffer with received data
3541  **/
3542
3543 static void e1000_rx_checksum(struct e1000_adapter *adapter, u32 status_err,
3544                               u32 csum, struct sk_buff *skb)
3545 {
3546         struct e1000_hw *hw = &adapter->hw;
3547         u16 status = (u16)status_err;
3548         u8 errors = (u8)(status_err >> 24);
3549         skb->ip_summed = CHECKSUM_NONE;
3550
3551         /* 82543 or newer only */
3552         if (unlikely(hw->mac_type < e1000_82543)) return;
3553         /* Ignore Checksum bit is set */
3554         if (unlikely(status & E1000_RXD_STAT_IXSM)) return;
3555         /* TCP/UDP checksum error bit is set */
3556         if (unlikely(errors & E1000_RXD_ERR_TCPE)) {
3557                 /* let the stack verify checksum errors */
3558                 adapter->hw_csum_err++;
3559                 return;
3560         }
3561         /* TCP/UDP Checksum has not been calculated */
3562         if (!(status & E1000_RXD_STAT_TCPCS))
3563                 return;
3564
3565         /* It must be a TCP or UDP packet with a valid checksum */
3566         if (likely(status & E1000_RXD_STAT_TCPCS)) {
3567                 /* TCP checksum is good */
3568                 skb->ip_summed = CHECKSUM_UNNECESSARY;
3569         }
3570         adapter->hw_csum_good++;
3571 }
3572
3573 /**
3574  * e1000_consume_page - helper function
3575  **/
3576 static void e1000_consume_page(struct e1000_buffer *bi, struct sk_buff *skb,
3577                                u16 length)
3578 {
3579         bi->page = NULL;
3580         skb->len += length;
3581         skb->data_len += length;
3582         skb->truesize += length;
3583 }
3584
3585 /**
3586  * e1000_receive_skb - helper function to handle rx indications
3587  * @adapter: board private structure
3588  * @status: descriptor status field as written by hardware
3589  * @vlan: descriptor vlan field as written by hardware (no le/be conversion)
3590  * @skb: pointer to sk_buff to be indicated to stack
3591  */
3592 static void e1000_receive_skb(struct e1000_adapter *adapter, u8 status,
3593                               __le16 vlan, struct sk_buff *skb)
3594 {
3595         if (unlikely(adapter->vlgrp && (status & E1000_RXD_STAT_VP))) {
3596                 vlan_hwaccel_receive_skb(skb, adapter->vlgrp,
3597                                          le16_to_cpu(vlan) &
3598                                          E1000_RXD_SPC_VLAN_MASK);
3599         } else {
3600                 netif_receive_skb(skb);
3601         }
3602 }
3603
3604 /**
3605  * e1000_clean_jumbo_rx_irq - Send received data up the network stack; legacy
3606  * @adapter: board private structure
3607  * @rx_ring: ring to clean
3608  * @work_done: amount of napi work completed this call
3609  * @work_to_do: max amount of work allowed for this call to do
3610  *
3611  * the return value indicates whether actual cleaning was done, there
3612  * is no guarantee that everything was cleaned
3613  */
3614 static bool e1000_clean_jumbo_rx_irq(struct e1000_adapter *adapter,
3615                                      struct e1000_rx_ring *rx_ring,
3616                                      int *work_done, int work_to_do)
3617 {
3618         struct e1000_hw *hw = &adapter->hw;
3619         struct net_device *netdev = adapter->netdev;
3620         struct pci_dev *pdev = adapter->pdev;
3621         struct e1000_rx_desc *rx_desc, *next_rxd;
3622         struct e1000_buffer *buffer_info, *next_buffer;
3623         unsigned long irq_flags;
3624         u32 length;
3625         unsigned int i;
3626         int cleaned_count = 0;
3627         bool cleaned = false;
3628         unsigned int total_rx_bytes=0, total_rx_packets=0;
3629
3630         i = rx_ring->next_to_clean;
3631         rx_desc = E1000_RX_DESC(*rx_ring, i);
3632         buffer_info = &rx_ring->buffer_info[i];
3633
3634         while (rx_desc->status & E1000_RXD_STAT_DD) {
3635                 struct sk_buff *skb;
3636                 u8 status;
3637
3638                 if (*work_done >= work_to_do)
3639                         break;
3640                 (*work_done)++;
3641
3642                 status = rx_desc->status;
3643                 skb = buffer_info->skb;
3644                 buffer_info->skb = NULL;
3645
3646                 if (++i == rx_ring->count) i = 0;
3647                 next_rxd = E1000_RX_DESC(*rx_ring, i);
3648                 prefetch(next_rxd);
3649
3650                 next_buffer = &rx_ring->buffer_info[i];
3651
3652                 cleaned = true;
3653                 cleaned_count++;
3654                 dma_unmap_page(&pdev->dev, buffer_info->dma,
3655                                buffer_info->length, DMA_FROM_DEVICE);
3656                 buffer_info->dma = 0;
3657
3658                 length = le16_to_cpu(rx_desc->length);
3659
3660                 /* errors is only valid for DD + EOP descriptors */
3661                 if (unlikely((status & E1000_RXD_STAT_EOP) &&
3662                     (rx_desc->errors & E1000_RXD_ERR_FRAME_ERR_MASK))) {
3663                         u8 last_byte = *(skb->data + length - 1);
3664                         if (TBI_ACCEPT(hw, status, rx_desc->errors, length,
3665                                        last_byte)) {
3666                                 spin_lock_irqsave(&adapter->stats_lock,
3667                                                   irq_flags);
3668                                 e1000_tbi_adjust_stats(hw, &adapter->stats,
3669                                                        length, skb->data);
3670                                 spin_unlock_irqrestore(&adapter->stats_lock,
3671                                                        irq_flags);
3672                                 length--;
3673                         } else {
3674                                 /* recycle both page and skb */
3675                                 buffer_info->skb = skb;
3676                                 /* an error means any chain goes out the window
3677                                  * too */
3678                                 if (rx_ring->rx_skb_top)
3679                                         dev_kfree_skb(rx_ring->rx_skb_top);
3680                                 rx_ring->rx_skb_top = NULL;
3681                                 goto next_desc;
3682                         }
3683                 }
3684
3685 #define rxtop rx_ring->rx_skb_top
3686                 if (!(status & E1000_RXD_STAT_EOP)) {
3687                         /* this descriptor is only the beginning (or middle) */
3688                         if (!rxtop) {
3689                                 /* this is the beginning of a chain */
3690                                 rxtop = skb;
3691                                 skb_fill_page_desc(rxtop, 0, buffer_info->page,
3692                                                    0, length);
3693                         } else {
3694                                 /* this is the middle of a chain */
3695                                 skb_fill_page_desc(rxtop,
3696                                     skb_shinfo(rxtop)->nr_frags,
3697                                     buffer_info->page, 0, length);
3698                                 /* re-use the skb, only consumed the page */
3699                                 buffer_info->skb = skb;
3700                         }
3701                         e1000_consume_page(buffer_info, rxtop, length);
3702                         goto next_desc;
3703                 } else {
3704                         if (rxtop) {
3705                                 /* end of the chain */
3706                                 skb_fill_page_desc(rxtop,
3707                                     skb_shinfo(rxtop)->nr_frags,
3708                                     buffer_info->page, 0, length);
3709                                 /* re-use the current skb, we only consumed the
3710                                  * page */
3711                                 buffer_info->skb = skb;
3712                                 skb = rxtop;
3713                                 rxtop = NULL;
3714                                 e1000_consume_page(buffer_info, skb, length);
3715                         } else {
3716                                 /* no chain, got EOP, this buf is the packet
3717                                  * copybreak to save the put_page/alloc_page */
3718                                 if (length <= copybreak &&
3719                                     skb_tailroom(skb) >= length) {
3720                                         u8 *vaddr;
3721                                         vaddr = kmap_atomic(buffer_info->page,
3722                                                             KM_SKB_DATA_SOFTIRQ);
3723                                         memcpy(skb_tail_pointer(skb), vaddr, length);
3724                                         kunmap_atomic(vaddr,
3725                                                       KM_SKB_DATA_SOFTIRQ);
3726                                         /* re-use the page, so don't erase
3727                                          * buffer_info->page */
3728                                         skb_put(skb, length);
3729                                 } else {
3730                                         skb_fill_page_desc(skb, 0,
3731                                                            buffer_info->page, 0,
3732                                                            length);
3733                                         e1000_consume_page(buffer_info, skb,
3734                                                            length);
3735                                 }
3736                         }
3737                 }
3738
3739                 /* Receive Checksum Offload XXX recompute due to CRC strip? */
3740                 e1000_rx_checksum(adapter,
3741                                   (u32)(status) |
3742                                   ((u32)(rx_desc->errors) << 24),
3743                                   le16_to_cpu(rx_desc->csum), skb);
3744
3745                 pskb_trim(skb, skb->len - 4);
3746
3747                 /* probably a little skewed due to removing CRC */
3748                 total_rx_bytes += skb->len;
3749                 total_rx_packets++;
3750
3751                 /* eth type trans needs skb->data to point to something */
3752                 if (!pskb_may_pull(skb, ETH_HLEN)) {
3753                         e_err("pskb_may_pull failed.\n");
3754                         dev_kfree_skb(skb);
3755                         goto next_desc;
3756                 }
3757
3758                 skb->protocol = eth_type_trans(skb, netdev);
3759
3760                 e1000_receive_skb(adapter, status, rx_desc->special, skb);
3761
3762 next_desc:
3763                 rx_desc->status = 0;
3764
3765                 /* return some buffers to hardware, one at a time is too slow */
3766                 if (unlikely(cleaned_count >= E1000_RX_BUFFER_WRITE)) {
3767                         adapter->alloc_rx_buf(adapter, rx_ring, cleaned_count);
3768                         cleaned_count = 0;
3769                 }
3770
3771                 /* use prefetched values */
3772                 rx_desc = next_rxd;
3773                 buffer_info = next_buffer;
3774         }
3775         rx_ring->next_to_clean = i;
3776
3777         cleaned_count = E1000_DESC_UNUSED(rx_ring);
3778         if (cleaned_count)
3779                 adapter->alloc_rx_buf(adapter, rx_ring, cleaned_count);
3780
3781         adapter->total_rx_packets += total_rx_packets;
3782         adapter->total_rx_bytes += total_rx_bytes;
3783         netdev->stats.rx_bytes += total_rx_bytes;
3784         netdev->stats.rx_packets += total_rx_packets;
3785         return cleaned;
3786 }
3787
3788 /*
3789  * this should improve performance for small packets with large amounts
3790  * of reassembly being done in the stack
3791  */
3792 static void e1000_check_copybreak(struct net_device *netdev,
3793                                  struct e1000_buffer *buffer_info,
3794                                  u32 length, struct sk_buff **skb)
3795 {
3796         struct sk_buff *new_skb;
3797
3798         if (length > copybreak)
3799                 return;
3800
3801         new_skb = netdev_alloc_skb_ip_align(netdev, length);
3802         if (!new_skb)
3803                 return;
3804
3805         skb_copy_to_linear_data_offset(new_skb, -NET_IP_ALIGN,
3806                                        (*skb)->data - NET_IP_ALIGN,
3807                                        length + NET_IP_ALIGN);
3808         /* save the skb in buffer_info as good */
3809         buffer_info->skb = *skb;
3810         *skb = new_skb;
3811 }
3812
3813 /**
3814  * e1000_clean_rx_irq - Send received data up the network stack; legacy
3815  * @adapter: board private structure
3816  * @rx_ring: ring to clean
3817  * @work_done: amount of napi work completed this call
3818  * @work_to_do: max amount of work allowed for this call to do
3819  */
3820 static bool e1000_clean_rx_irq(struct e1000_adapter *adapter,
3821                                struct e1000_rx_ring *rx_ring,
3822                                int *work_done, int work_to_do)
3823 {
3824         struct e1000_hw *hw = &adapter->hw;
3825         struct net_device *netdev = adapter->netdev;
3826         struct pci_dev *pdev = adapter->pdev;
3827         struct e1000_rx_desc *rx_desc, *next_rxd;
3828         struct e1000_buffer *buffer_info, *next_buffer;
3829         unsigned long flags;
3830         u32 length;
3831         unsigned int i;
3832         int cleaned_count = 0;
3833         bool cleaned = false;
3834         unsigned int total_rx_bytes=0, total_rx_packets=0;
3835
3836         i = rx_ring->next_to_clean;
3837         rx_desc = E1000_RX_DESC(*rx_ring, i);
3838         buffer_info = &rx_ring->buffer_info[i];
3839
3840         while (rx_desc->status & E1000_RXD_STAT_DD) {
3841                 struct sk_buff *skb;
3842                 u8 status;
3843
3844                 if (*work_done >= work_to_do)
3845                         break;
3846                 (*work_done)++;
3847
3848                 status = rx_desc->status;
3849                 skb = buffer_info->skb;
3850                 buffer_info->skb = NULL;
3851
3852                 prefetch(skb->data - NET_IP_ALIGN);
3853
3854                 if (++i == rx_ring->count) i = 0;
3855                 next_rxd = E1000_RX_DESC(*rx_ring, i);
3856                 prefetch(next_rxd);
3857
3858                 next_buffer = &rx_ring->buffer_info[i];
3859
3860                 cleaned = true;
3861                 cleaned_count++;
3862                 dma_unmap_single(&pdev->dev, buffer_info->dma,
3863                                  buffer_info->length, DMA_FROM_DEVICE);
3864                 buffer_info->dma = 0;
3865
3866                 length = le16_to_cpu(rx_desc->length);
3867                 /* !EOP means multiple descriptors were used to store a single
3868                  * packet, if thats the case we need to toss it.  In fact, we
3869                  * to toss every packet with the EOP bit clear and the next
3870                  * frame that _does_ have the EOP bit set, as it is by
3871                  * definition only a frame fragment
3872                  */
3873                 if (unlikely(!(status & E1000_RXD_STAT_EOP)))
3874                         adapter->discarding = true;
3875
3876                 if (adapter->discarding) {
3877                         /* All receives must fit into a single buffer */
3878                         e_info("Receive packet consumed multiple buffers\n");
3879                         /* recycle */
3880                         buffer_info->skb = skb;
3881                         if (status & E1000_RXD_STAT_EOP)
3882                                 adapter->discarding = false;
3883                         goto next_desc;
3884                 }
3885
3886                 if (unlikely(rx_desc->errors & E1000_RXD_ERR_FRAME_ERR_MASK)) {
3887                         u8 last_byte = *(skb->data + length - 1);
3888                         if (TBI_ACCEPT(hw, status, rx_desc->errors, length,
3889                                        last_byte)) {
3890                                 spin_lock_irqsave(&adapter->stats_lock, flags);
3891                                 e1000_tbi_adjust_stats(hw, &adapter->stats,
3892                                                        length, skb->data);
3893                                 spin_unlock_irqrestore(&adapter->stats_lock,
3894                                                        flags);
3895                                 length--;
3896                         } else {
3897                                 /* recycle */
3898                                 buffer_info->skb = skb;
3899                                 goto next_desc;
3900                         }
3901                 }
3902
3903                 /* adjust length to remove Ethernet CRC, this must be
3904                  * done after the TBI_ACCEPT workaround above */
3905                 length -= 4;
3906
3907                 /* probably a little skewed due to removing CRC */
3908                 total_rx_bytes += length;
3909                 total_rx_packets++;
3910
3911                 e1000_check_copybreak(netdev, buffer_info, length, &skb);
3912
3913                 skb_put(skb, length);
3914
3915                 /* Receive Checksum Offload */
3916                 e1000_rx_checksum(adapter,
3917                                   (u32)(status) |
3918                                   ((u32)(rx_desc->errors) << 24),
3919                                   le16_to_cpu(rx_desc->csum), skb);
3920
3921                 skb->protocol = eth_type_trans(skb, netdev);
3922
3923                 e1000_receive_skb(adapter, status, rx_desc->special, skb);
3924
3925 next_desc:
3926                 rx_desc->status = 0;
3927
3928                 /* return some buffers to hardware, one at a time is too slow */
3929                 if (unlikely(cleaned_count >= E1000_RX_BUFFER_WRITE)) {
3930                         adapter->alloc_rx_buf(adapter, rx_ring, cleaned_count);
3931                         cleaned_count = 0;
3932                 }
3933
3934                 /* use prefetched values */
3935                 rx_desc = next_rxd;
3936                 buffer_info = next_buffer;
3937         }
3938         rx_ring->next_to_clean = i;
3939
3940         cleaned_count = E1000_DESC_UNUSED(rx_ring);
3941         if (cleaned_count)
3942                 adapter->alloc_rx_buf(adapter, rx_ring, cleaned_count);
3943
3944         adapter->total_rx_packets += total_rx_packets;
3945         adapter->total_rx_bytes += total_rx_bytes;
3946         netdev->stats.rx_bytes += total_rx_bytes;
3947         netdev->stats.rx_packets += total_rx_packets;
3948         return cleaned;
3949 }
3950
3951 /**
3952  * e1000_alloc_jumbo_rx_buffers - Replace used jumbo receive buffers
3953  * @adapter: address of board private structure
3954  * @rx_ring: pointer to receive ring structure
3955  * @cleaned_count: number of buffers to allocate this pass
3956  **/
3957
3958 static void
3959 e1000_alloc_jumbo_rx_buffers(struct e1000_adapter *adapter,
3960                              struct e1000_rx_ring *rx_ring, int cleaned_count)
3961 {
3962         struct net_device *netdev = adapter->netdev;
3963         struct pci_dev *pdev = adapter->pdev;
3964         struct e1000_rx_desc *rx_desc;
3965         struct e1000_buffer *buffer_info;
3966         struct sk_buff *skb;
3967         unsigned int i;
3968         unsigned int bufsz = 256 - 16 /*for skb_reserve */ ;
3969
3970         i = rx_ring->next_to_use;
3971         buffer_info = &rx_ring->buffer_info[i];
3972
3973         while (cleaned_count--) {
3974                 skb = buffer_info->skb;
3975                 if (skb) {
3976                         skb_trim(skb, 0);
3977                         goto check_page;
3978                 }
3979
3980                 skb = netdev_alloc_skb_ip_align(netdev, bufsz);
3981                 if (unlikely(!skb)) {
3982                         /* Better luck next round */
3983                         adapter->alloc_rx_buff_failed++;
3984                         break;
3985                 }
3986
3987                 /* Fix for errata 23, can't cross 64kB boundary */
3988                 if (!e1000_check_64k_bound(adapter, skb->data, bufsz)) {
3989                         struct sk_buff *oldskb = skb;
3990                         e_err("skb align check failed: %u bytes at %p\n",
3991                               bufsz, skb->data);
3992                         /* Try again, without freeing the previous */
3993                         skb = netdev_alloc_skb_ip_align(netdev, bufsz);
3994                         /* Failed allocation, critical failure */
3995                         if (!skb) {
3996                                 dev_kfree_skb(oldskb);
3997                                 adapter->alloc_rx_buff_failed++;
3998                                 break;
3999                         }
4000
4001                         if (!e1000_check_64k_bound(adapter, skb->data, bufsz)) {
4002                                 /* give up */
4003                                 dev_kfree_skb(skb);
4004                                 dev_kfree_skb(oldskb);
4005                                 break; /* while (cleaned_count--) */
4006                         }
4007
4008                         /* Use new allocation */
4009                         dev_kfree_skb(oldskb);
4010                 }
4011                 buffer_info->skb = skb;
4012                 buffer_info->length = adapter->rx_buffer_len;
4013 check_page:
4014                 /* allocate a new page if necessary */
4015                 if (!buffer_info->page) {
4016                         buffer_info->page = alloc_page(GFP_ATOMIC);
4017                         if (unlikely(!buffer_info->page)) {
4018                                 adapter->alloc_rx_buff_failed++;
4019                                 break;
4020                         }
4021                 }
4022
4023                 if (!buffer_info->dma) {
4024                         buffer_info->dma = dma_map_page(&pdev->dev,
4025                                                         buffer_info->page, 0,
4026                                                         buffer_info->length,
4027                                                         DMA_FROM_DEVICE);
4028                         if (dma_mapping_error(&pdev->dev, buffer_info->dma)) {
4029                                 put_page(buffer_info->page);
4030                                 dev_kfree_skb(skb);
4031                                 buffer_info->page = NULL;
4032                                 buffer_info->skb = NULL;
4033                                 buffer_info->dma = 0;
4034                                 adapter->alloc_rx_buff_failed++;
4035                                 break; /* while !buffer_info->skb */
4036                         }
4037                 }
4038
4039                 rx_desc = E1000_RX_DESC(*rx_ring, i);
4040                 rx_desc->buffer_addr = cpu_to_le64(buffer_info->dma);
4041
4042                 if (unlikely(++i == rx_ring->count))
4043                         i = 0;
4044                 buffer_info = &rx_ring->buffer_info[i];
4045         }
4046
4047         if (likely(rx_ring->next_to_use != i)) {
4048                 rx_ring->next_to_use = i;
4049                 if (unlikely(i-- == 0))
4050                         i = (rx_ring->count - 1);
4051
4052                 /* Force memory writes to complete before letting h/w
4053                  * know there are new descriptors to fetch.  (Only
4054                  * applicable for weak-ordered memory model archs,
4055                  * such as IA-64). */
4056                 wmb();
4057                 writel(i, adapter->hw.hw_addr + rx_ring->rdt);
4058         }
4059 }
4060
4061 /**
4062  * e1000_alloc_rx_buffers - Replace used receive buffers; legacy & extended
4063  * @adapter: address of board private structure
4064  **/
4065
4066 static void e1000_alloc_rx_buffers(struct e1000_adapter *adapter,
4067                                    struct e1000_rx_ring *rx_ring,
4068                                    int cleaned_count)
4069 {
4070         struct e1000_hw *hw = &adapter->hw;
4071         struct net_device *netdev = adapter->netdev;
4072         struct pci_dev *pdev = adapter->pdev;
4073         struct e1000_rx_desc *rx_desc;
4074         struct e1000_buffer *buffer_info;
4075         struct sk_buff *skb;
4076         unsigned int i;
4077         unsigned int bufsz = adapter->rx_buffer_len;
4078
4079         i = rx_ring->next_to_use;
4080         buffer_info = &rx_ring->buffer_info[i];
4081
4082         while (cleaned_count--) {
4083                 skb = buffer_info->skb;
4084                 if (skb) {
4085                         skb_trim(skb, 0);
4086                         goto map_skb;
4087                 }
4088
4089                 skb = netdev_alloc_skb_ip_align(netdev, bufsz);
4090                 if (unlikely(!skb)) {
4091                         /* Better luck next round */
4092                         adapter->alloc_rx_buff_failed++;
4093                         break;
4094                 }
4095
4096                 /* Fix for errata 23, can't cross 64kB boundary */
4097                 if (!e1000_check_64k_bound(adapter, skb->data, bufsz)) {
4098                         struct sk_buff *oldskb = skb;
4099                         e_err("skb align check failed: %u bytes at %p\n",
4100                               bufsz, skb->data);
4101                         /* Try again, without freeing the previous */
4102                         skb = netdev_alloc_skb_ip_align(netdev, bufsz);
4103                         /* Failed allocation, critical failure */
4104                         if (!skb) {
4105                                 dev_kfree_skb(oldskb);
4106                                 adapter->alloc_rx_buff_failed++;
4107                                 break;
4108                         }
4109
4110                         if (!e1000_check_64k_bound(adapter, skb->data, bufsz)) {
4111                                 /* give up */
4112                                 dev_kfree_skb(skb);
4113                                 dev_kfree_skb(oldskb);
4114                                 adapter->alloc_rx_buff_failed++;
4115                                 break; /* while !buffer_info->skb */
4116                         }
4117
4118                         /* Use new allocation */
4119                         dev_kfree_skb(oldskb);
4120                 }
4121                 buffer_info->skb = skb;
4122                 buffer_info->length = adapter->rx_buffer_len;
4123 map_skb:
4124                 buffer_info->dma = dma_map_single(&pdev->dev,
4125                                                   skb->data,
4126                                                   buffer_info->length,
4127                                                   DMA_FROM_DEVICE);
4128                 if (dma_mapping_error(&pdev->dev, buffer_info->dma)) {
4129                         dev_kfree_skb(skb);
4130                         buffer_info->skb = NULL;
4131                         buffer_info->dma = 0;
4132                         adapter->alloc_rx_buff_failed++;
4133                         break; /* while !buffer_info->skb */
4134                 }
4135
4136                 /*
4137                  * XXX if it was allocated cleanly it will never map to a
4138                  * boundary crossing
4139                  */
4140
4141                 /* Fix for errata 23, can't cross 64kB boundary */
4142                 if (!e1000_check_64k_bound(adapter,
4143                                         (void *)(unsigned long)buffer_info->dma,
4144                                         adapter->rx_buffer_len)) {
4145                         e_err("dma align check failed: %u bytes at %p\n",
4146                               adapter->rx_buffer_len,
4147                               (void *)(unsigned long)buffer_info->dma);
4148                         dev_kfree_skb(skb);
4149                         buffer_info->skb = NULL;
4150
4151                         dma_unmap_single(&pdev->dev, buffer_info->dma,
4152                                          adapter->rx_buffer_len,
4153                                          DMA_FROM_DEVICE);
4154                         buffer_info->dma = 0;
4155
4156                         adapter->alloc_rx_buff_failed++;
4157                         break; /* while !buffer_info->skb */
4158                 }
4159                 rx_desc = E1000_RX_DESC(*rx_ring, i);
4160                 rx_desc->buffer_addr = cpu_to_le64(buffer_info->dma);
4161
4162                 if (unlikely(++i == rx_ring->count))
4163                         i = 0;
4164                 buffer_info = &rx_ring->buffer_info[i];
4165         }
4166
4167         if (likely(rx_ring->next_to_use != i)) {
4168                 rx_ring->next_to_use = i;
4169                 if (unlikely(i-- == 0))
4170                         i = (rx_ring->count - 1);
4171
4172                 /* Force memory writes to complete before letting h/w
4173                  * know there are new descriptors to fetch.  (Only
4174                  * applicable for weak-ordered memory model archs,
4175                  * such as IA-64). */
4176                 wmb();
4177                 writel(i, hw->hw_addr + rx_ring->rdt);
4178         }
4179 }
4180
4181 /**
4182  * e1000_smartspeed - Workaround for SmartSpeed on 82541 and 82547 controllers.
4183  * @adapter:
4184  **/
4185
4186 static void e1000_smartspeed(struct e1000_adapter *adapter)
4187 {
4188         struct e1000_hw *hw = &adapter->hw;
4189         u16 phy_status;
4190         u16 phy_ctrl;
4191
4192         if ((hw->phy_type != e1000_phy_igp) || !hw->autoneg ||
4193            !(hw->autoneg_advertised & ADVERTISE_1000_FULL))
4194                 return;
4195
4196         if (adapter->smartspeed == 0) {
4197                 /* If Master/Slave config fault is asserted twice,
4198                  * we assume back-to-back */
4199                 e1000_read_phy_reg(hw, PHY_1000T_STATUS, &phy_status);
4200                 if (!(phy_status & SR_1000T_MS_CONFIG_FAULT)) return;
4201                 e1000_read_phy_reg(hw, PHY_1000T_STATUS, &phy_status);
4202                 if (!(phy_status & SR_1000T_MS_CONFIG_FAULT)) return;
4203                 e1000_read_phy_reg(hw, PHY_1000T_CTRL, &phy_ctrl);
4204                 if (phy_ctrl & CR_1000T_MS_ENABLE) {
4205                         phy_ctrl &= ~CR_1000T_MS_ENABLE;
4206                         e1000_write_phy_reg(hw, PHY_1000T_CTRL,
4207                                             phy_ctrl);
4208                         adapter->smartspeed++;
4209                         if (!e1000_phy_setup_autoneg(hw) &&
4210                            !e1000_read_phy_reg(hw, PHY_CTRL,
4211                                                &phy_ctrl)) {
4212                                 phy_ctrl |= (MII_CR_AUTO_NEG_EN |
4213                                              MII_CR_RESTART_AUTO_NEG);
4214                                 e1000_write_phy_reg(hw, PHY_CTRL,
4215                                                     phy_ctrl);
4216                         }
4217                 }
4218                 return;
4219         } else if (adapter->smartspeed == E1000_SMARTSPEED_DOWNSHIFT) {
4220                 /* If still no link, perhaps using 2/3 pair cable */
4221                 e1000_read_phy_reg(hw, PHY_1000T_CTRL, &phy_ctrl);
4222                 phy_ctrl |= CR_1000T_MS_ENABLE;
4223                 e1000_write_phy_reg(hw, PHY_1000T_CTRL, phy_ctrl);
4224                 if (!e1000_phy_setup_autoneg(hw) &&
4225                    !e1000_read_phy_reg(hw, PHY_CTRL, &phy_ctrl)) {
4226                         phy_ctrl |= (MII_CR_AUTO_NEG_EN |
4227                                      MII_CR_RESTART_AUTO_NEG);
4228                         e1000_write_phy_reg(hw, PHY_CTRL, phy_ctrl);
4229                 }
4230         }
4231         /* Restart process after E1000_SMARTSPEED_MAX iterations */
4232         if (adapter->smartspeed++ == E1000_SMARTSPEED_MAX)
4233                 adapter->smartspeed = 0;
4234 }
4235
4236 /**
4237  * e1000_ioctl -
4238  * @netdev:
4239  * @ifreq:
4240  * @cmd:
4241  **/
4242
4243 static int e1000_ioctl(struct net_device *netdev, struct ifreq *ifr, int cmd)
4244 {
4245         switch (cmd) {
4246         case SIOCGMIIPHY:
4247         case SIOCGMIIREG:
4248         case SIOCSMIIREG:
4249                 return e1000_mii_ioctl(netdev, ifr, cmd);
4250         default:
4251                 return -EOPNOTSUPP;
4252         }
4253 }
4254
4255 /**
4256  * e1000_mii_ioctl -
4257  * @netdev:
4258  * @ifreq:
4259  * @cmd:
4260  **/
4261
4262 static int e1000_mii_ioctl(struct net_device *netdev, struct ifreq *ifr,
4263                            int cmd)
4264 {
4265         struct e1000_adapter *adapter = netdev_priv(netdev);
4266         struct e1000_hw *hw = &adapter->hw;
4267         struct mii_ioctl_data *data = if_mii(ifr);
4268         int retval;
4269         u16 mii_reg;
4270         u16 spddplx;
4271         unsigned long flags;
4272
4273         if (hw->media_type != e1000_media_type_copper)
4274                 return -EOPNOTSUPP;
4275
4276         switch (cmd) {
4277         case SIOCGMIIPHY:
4278                 data->phy_id = hw->phy_addr;
4279                 break;
4280         case SIOCGMIIREG:
4281                 spin_lock_irqsave(&adapter->stats_lock, flags);
4282                 if (e1000_read_phy_reg(hw, data->reg_num & 0x1F,
4283                                    &data->val_out)) {
4284                         spin_unlock_irqrestore(&adapter->stats_lock, flags);
4285                         return -EIO;
4286                 }
4287                 spin_unlock_irqrestore(&adapter->stats_lock, flags);
4288                 break;
4289         case SIOCSMIIREG:
4290                 if (data->reg_num & ~(0x1F))
4291                         return -EFAULT;
4292                 mii_reg = data->val_in;
4293                 spin_lock_irqsave(&adapter->stats_lock, flags);
4294                 if (e1000_write_phy_reg(hw, data->reg_num,
4295                                         mii_reg)) {
4296                         spin_unlock_irqrestore(&adapter->stats_lock, flags);
4297                         return -EIO;
4298                 }
4299                 spin_unlock_irqrestore(&adapter->stats_lock, flags);
4300                 if (hw->media_type == e1000_media_type_copper) {
4301                         switch (data->reg_num) {
4302                         case PHY_CTRL:
4303                                 if (mii_reg & MII_CR_POWER_DOWN)
4304                                         break;
4305                                 if (mii_reg & MII_CR_AUTO_NEG_EN) {
4306                                         hw->autoneg = 1;
4307                                         hw->autoneg_advertised = 0x2F;
4308                                 } else {
4309                                         if (mii_reg & 0x40)
4310                                                 spddplx = SPEED_1000;
4311                                         else if (mii_reg & 0x2000)
4312                                                 spddplx = SPEED_100;
4313                                         else
4314                                                 spddplx = SPEED_10;
4315                                         spddplx += (mii_reg & 0x100)
4316                                                    ? DUPLEX_FULL :
4317                                                    DUPLEX_HALF;
4318                                         retval = e1000_set_spd_dplx(adapter,
4319                                                                     spddplx);
4320                                         if (retval)
4321                                                 return retval;
4322                                 }
4323                                 if (netif_running(adapter->netdev))
4324                                         e1000_reinit_locked(adapter);
4325                                 else
4326                                         e1000_reset(adapter);
4327                                 break;
4328                         case M88E1000_PHY_SPEC_CTRL:
4329                         case M88E1000_EXT_PHY_SPEC_CTRL:
4330                                 if (e1000_phy_reset(hw))
4331                                         return -EIO;
4332                                 break;
4333                         }
4334                 } else {
4335                         switch (data->reg_num) {
4336                         case PHY_CTRL:
4337                                 if (mii_reg & MII_CR_POWER_DOWN)
4338                                         break;
4339                                 if (netif_running(adapter->netdev))
4340                                         e1000_reinit_locked(adapter);
4341                                 else
4342                                         e1000_reset(adapter);
4343                                 break;
4344                         }
4345                 }
4346                 break;
4347         default:
4348                 return -EOPNOTSUPP;
4349         }
4350         return E1000_SUCCESS;
4351 }
4352
4353 void e1000_pci_set_mwi(struct e1000_hw *hw)
4354 {
4355         struct e1000_adapter *adapter = hw->back;
4356         int ret_val = pci_set_mwi(adapter->pdev);
4357
4358         if (ret_val)
4359                 e_err("Error in setting MWI\n");
4360 }
4361
4362 void e1000_pci_clear_mwi(struct e1000_hw *hw)
4363 {
4364         struct e1000_adapter *adapter = hw->back;
4365
4366         pci_clear_mwi(adapter->pdev);
4367 }
4368
4369 int e1000_pcix_get_mmrbc(struct e1000_hw *hw)
4370 {
4371         struct e1000_adapter *adapter = hw->back;
4372         return pcix_get_mmrbc(adapter->pdev);
4373 }
4374
4375 void e1000_pcix_set_mmrbc(struct e1000_hw *hw, int mmrbc)
4376 {
4377         struct e1000_adapter *adapter = hw->back;
4378         pcix_set_mmrbc(adapter->pdev, mmrbc);
4379 }
4380
4381 void e1000_io_write(struct e1000_hw *hw, unsigned long port, u32 value)
4382 {
4383         outl(value, port);
4384 }
4385
4386 static void e1000_vlan_rx_register(struct net_device *netdev,
4387                                    struct vlan_group *grp)
4388 {
4389         struct e1000_adapter *adapter = netdev_priv(netdev);
4390         struct e1000_hw *hw = &adapter->hw;
4391         u32 ctrl, rctl;
4392
4393         if (!test_bit(__E1000_DOWN, &adapter->flags))
4394                 e1000_irq_disable(adapter);
4395         adapter->vlgrp = grp;
4396
4397         if (grp) {
4398                 /* enable VLAN tag insert/strip */
4399                 ctrl = er32(CTRL);
4400                 ctrl |= E1000_CTRL_VME;
4401                 ew32(CTRL, ctrl);
4402
4403                 /* enable VLAN receive filtering */
4404                 rctl = er32(RCTL);
4405                 rctl &= ~E1000_RCTL_CFIEN;
4406                 if (!(netdev->flags & IFF_PROMISC))
4407                         rctl |= E1000_RCTL_VFE;
4408                 ew32(RCTL, rctl);
4409                 e1000_update_mng_vlan(adapter);
4410         } else {
4411                 /* disable VLAN tag insert/strip */
4412                 ctrl = er32(CTRL);
4413                 ctrl &= ~E1000_CTRL_VME;
4414                 ew32(CTRL, ctrl);
4415
4416                 /* disable VLAN receive filtering */
4417                 rctl = er32(RCTL);
4418                 rctl &= ~E1000_RCTL_VFE;
4419                 ew32(RCTL, rctl);
4420
4421                 if (adapter->mng_vlan_id != (u16)E1000_MNG_VLAN_NONE) {
4422                         e1000_vlan_rx_kill_vid(netdev, adapter->mng_vlan_id);
4423                         adapter->mng_vlan_id = E1000_MNG_VLAN_NONE;
4424                 }
4425         }
4426
4427         if (!test_bit(__E1000_DOWN, &adapter->flags))
4428                 e1000_irq_enable(adapter);
4429 }
4430
4431 static void e1000_vlan_rx_add_vid(struct net_device *netdev, u16 vid)
4432 {
4433         struct e1000_adapter *adapter = netdev_priv(netdev);
4434         struct e1000_hw *hw = &adapter->hw;
4435         u32 vfta, index;
4436
4437         if ((hw->mng_cookie.status &
4438              E1000_MNG_DHCP_COOKIE_STATUS_VLAN_SUPPORT) &&
4439             (vid == adapter->mng_vlan_id))
4440                 return;
4441         /* add VID to filter table */
4442         index = (vid >> 5) & 0x7F;
4443         vfta = E1000_READ_REG_ARRAY(hw, VFTA, index);
4444         vfta |= (1 << (vid & 0x1F));
4445         e1000_write_vfta(hw, index, vfta);
4446 }
4447
4448 static void e1000_vlan_rx_kill_vid(struct net_device *netdev, u16 vid)
4449 {
4450         struct e1000_adapter *adapter = netdev_priv(netdev);
4451         struct e1000_hw *hw = &adapter->hw;
4452         u32 vfta, index;
4453
4454         if (!test_bit(__E1000_DOWN, &adapter->flags))
4455                 e1000_irq_disable(adapter);
4456         vlan_group_set_device(adapter->vlgrp, vid, NULL);
4457         if (!test_bit(__E1000_DOWN, &adapter->flags))
4458                 e1000_irq_enable(adapter);
4459
4460         /* remove VID from filter table */
4461         index = (vid >> 5) & 0x7F;
4462         vfta = E1000_READ_REG_ARRAY(hw, VFTA, index);
4463         vfta &= ~(1 << (vid & 0x1F));
4464         e1000_write_vfta(hw, index, vfta);
4465 }
4466
4467 static void e1000_restore_vlan(struct e1000_adapter *adapter)
4468 {
4469         e1000_vlan_rx_register(adapter->netdev, adapter->vlgrp);
4470
4471         if (adapter->vlgrp) {
4472                 u16 vid;
4473                 for (vid = 0; vid < VLAN_GROUP_ARRAY_LEN; vid++) {
4474                         if (!vlan_group_get_device(adapter->vlgrp, vid))
4475                                 continue;
4476                         e1000_vlan_rx_add_vid(adapter->netdev, vid);
4477                 }
4478         }
4479 }
4480
4481 int e1000_set_spd_dplx(struct e1000_adapter *adapter, u16 spddplx)
4482 {
4483         struct e1000_hw *hw = &adapter->hw;
4484
4485         hw->autoneg = 0;
4486
4487         /* Fiber NICs only allow 1000 gbps Full duplex */
4488         if ((hw->media_type == e1000_media_type_fiber) &&
4489                 spddplx != (SPEED_1000 + DUPLEX_FULL)) {
4490                 e_err("Unsupported Speed/Duplex configuration\n");
4491                 return -EINVAL;
4492         }
4493
4494         switch (spddplx) {
4495         case SPEED_10 + DUPLEX_HALF:
4496                 hw->forced_speed_duplex = e1000_10_half;
4497                 break;
4498         case SPEED_10 + DUPLEX_FULL:
4499                 hw->forced_speed_duplex = e1000_10_full;
4500                 break;
4501         case SPEED_100 + DUPLEX_HALF:
4502                 hw->forced_speed_duplex = e1000_100_half;
4503                 break;
4504         case SPEED_100 + DUPLEX_FULL:
4505                 hw->forced_speed_duplex = e1000_100_full;
4506                 break;
4507         case SPEED_1000 + DUPLEX_FULL:
4508                 hw->autoneg = 1;
4509                 hw->autoneg_advertised = ADVERTISE_1000_FULL;
4510                 break;
4511         case SPEED_1000 + DUPLEX_HALF: /* not supported */
4512         default:
4513                 e_err("Unsupported Speed/Duplex configuration\n");
4514                 return -EINVAL;
4515         }
4516         return 0;
4517 }
4518
4519 static int __e1000_shutdown(struct pci_dev *pdev, bool *enable_wake)
4520 {
4521         struct net_device *netdev = pci_get_drvdata(pdev);
4522         struct e1000_adapter *adapter = netdev_priv(netdev);
4523         struct e1000_hw *hw = &adapter->hw;
4524         u32 ctrl, ctrl_ext, rctl, status;
4525         u32 wufc = adapter->wol;
4526 #ifdef CONFIG_PM
4527         int retval = 0;
4528 #endif
4529
4530         netif_device_detach(netdev);
4531
4532         if (netif_running(netdev)) {
4533                 WARN_ON(test_bit(__E1000_RESETTING, &adapter->flags));
4534                 e1000_down(adapter);
4535         }
4536
4537 #ifdef CONFIG_PM
4538         retval = pci_save_state(pdev);
4539         if (retval)
4540                 return retval;
4541 #endif
4542
4543         status = er32(STATUS);
4544         if (status & E1000_STATUS_LU)
4545                 wufc &= ~E1000_WUFC_LNKC;
4546
4547         if (wufc) {
4548                 e1000_setup_rctl(adapter);
4549                 e1000_set_rx_mode(netdev);
4550
4551                 /* turn on all-multi mode if wake on multicast is enabled */
4552                 if (wufc & E1000_WUFC_MC) {
4553                         rctl = er32(RCTL);
4554                         rctl |= E1000_RCTL_MPE;
4555                         ew32(RCTL, rctl);
4556                 }
4557
4558                 if (hw->mac_type >= e1000_82540) {
4559                         ctrl = er32(CTRL);
4560                         /* advertise wake from D3Cold */
4561                         #define E1000_CTRL_ADVD3WUC 0x00100000
4562                         /* phy power management enable */
4563                         #define E1000_CTRL_EN_PHY_PWR_MGMT 0x00200000
4564                         ctrl |= E1000_CTRL_ADVD3WUC |
4565                                 E1000_CTRL_EN_PHY_PWR_MGMT;
4566                         ew32(CTRL, ctrl);
4567                 }
4568
4569                 if (hw->media_type == e1000_media_type_fiber ||
4570                     hw->media_type == e1000_media_type_internal_serdes) {
4571                         /* keep the laser running in D3 */
4572                         ctrl_ext = er32(CTRL_EXT);
4573                         ctrl_ext |= E1000_CTRL_EXT_SDP7_DATA;
4574                         ew32(CTRL_EXT, ctrl_ext);
4575                 }
4576
4577                 ew32(WUC, E1000_WUC_PME_EN);
4578                 ew32(WUFC, wufc);
4579         } else {
4580                 ew32(WUC, 0);
4581                 ew32(WUFC, 0);
4582         }
4583
4584         e1000_release_manageability(adapter);
4585
4586         *enable_wake = !!wufc;
4587
4588         /* make sure adapter isn't asleep if manageability is enabled */
4589         if (adapter->en_mng_pt)
4590                 *enable_wake = true;
4591
4592         if (netif_running(netdev))
4593                 e1000_free_irq(adapter);
4594
4595         pci_disable_device(pdev);
4596
4597         return 0;
4598 }
4599
4600 #ifdef CONFIG_PM
4601 static int e1000_suspend(struct pci_dev *pdev, pm_message_t state)
4602 {
4603         int retval;
4604         bool wake;
4605
4606         retval = __e1000_shutdown(pdev, &wake);
4607         if (retval)
4608                 return retval;
4609
4610         if (wake) {
4611                 pci_prepare_to_sleep(pdev);
4612         } else {
4613                 pci_wake_from_d3(pdev, false);
4614                 pci_set_power_state(pdev, PCI_D3hot);
4615         }
4616
4617         return 0;
4618 }
4619
4620 static int e1000_resume(struct pci_dev *pdev)
4621 {
4622         struct net_device *netdev = pci_get_drvdata(pdev);
4623         struct e1000_adapter *adapter = netdev_priv(netdev);
4624         struct e1000_hw *hw = &adapter->hw;
4625         u32 err;
4626
4627         pci_set_power_state(pdev, PCI_D0);
4628         pci_restore_state(pdev);
4629         pci_save_state(pdev);
4630
4631         if (adapter->need_ioport)
4632                 err = pci_enable_device(pdev);
4633         else
4634                 err = pci_enable_device_mem(pdev);
4635         if (err) {
4636                 pr_err("Cannot enable PCI device from suspend\n");
4637                 return err;
4638         }
4639         pci_set_master(pdev);
4640
4641         pci_enable_wake(pdev, PCI_D3hot, 0);
4642         pci_enable_wake(pdev, PCI_D3cold, 0);
4643
4644         if (netif_running(netdev)) {
4645                 err = e1000_request_irq(adapter);
4646                 if (err)
4647                         return err;
4648         }
4649
4650         e1000_power_up_phy(adapter);
4651         e1000_reset(adapter);
4652         ew32(WUS, ~0);
4653
4654         e1000_init_manageability(adapter);
4655
4656         if (netif_running(netdev))
4657                 e1000_up(adapter);
4658
4659         netif_device_attach(netdev);
4660
4661         return 0;
4662 }
4663 #endif
4664
4665 static void e1000_shutdown(struct pci_dev *pdev)
4666 {
4667         bool wake;
4668
4669         __e1000_shutdown(pdev, &wake);
4670
4671         if (system_state == SYSTEM_POWER_OFF) {
4672                 pci_wake_from_d3(pdev, wake);
4673                 pci_set_power_state(pdev, PCI_D3hot);
4674         }
4675 }
4676
4677 #ifdef CONFIG_NET_POLL_CONTROLLER
4678 /*
4679  * Polling 'interrupt' - used by things like netconsole to send skbs
4680  * without having to re-enable interrupts. It's not called while
4681  * the interrupt routine is executing.
4682  */
4683 static void e1000_netpoll(struct net_device *netdev)
4684 {
4685         struct e1000_adapter *adapter = netdev_priv(netdev);
4686
4687         disable_irq(adapter->pdev->irq);
4688         e1000_intr(adapter->pdev->irq, netdev);
4689         enable_irq(adapter->pdev->irq);
4690 }
4691 #endif
4692
4693 /**
4694  * e1000_io_error_detected - called when PCI error is detected
4695  * @pdev: Pointer to PCI device
4696  * @state: The current pci connection state
4697  *
4698  * This function is called after a PCI bus error affecting
4699  * this device has been detected.
4700  */
4701 static pci_ers_result_t e1000_io_error_detected(struct pci_dev *pdev,
4702                                                 pci_channel_state_t state)
4703 {
4704         struct net_device *netdev = pci_get_drvdata(pdev);
4705         struct e1000_adapter *adapter = netdev_priv(netdev);
4706
4707         netif_device_detach(netdev);
4708
4709         if (state == pci_channel_io_perm_failure)
4710                 return PCI_ERS_RESULT_DISCONNECT;
4711
4712         if (netif_running(netdev))
4713                 e1000_down(adapter);
4714         pci_disable_device(pdev);
4715
4716         /* Request a slot slot reset. */
4717         return PCI_ERS_RESULT_NEED_RESET;
4718 }
4719
4720 /**
4721  * e1000_io_slot_reset - called after the pci bus has been reset.
4722  * @pdev: Pointer to PCI device
4723  *
4724  * Restart the card from scratch, as if from a cold-boot. Implementation
4725  * resembles the first-half of the e1000_resume routine.
4726  */
4727 static pci_ers_result_t e1000_io_slot_reset(struct pci_dev *pdev)
4728 {
4729         struct net_device *netdev = pci_get_drvdata(pdev);
4730         struct e1000_adapter *adapter = netdev_priv(netdev);
4731         struct e1000_hw *hw = &adapter->hw;
4732         int err;
4733
4734         if (adapter->need_ioport)
4735                 err = pci_enable_device(pdev);
4736         else
4737                 err = pci_enable_device_mem(pdev);
4738         if (err) {
4739                 pr_err("Cannot re-enable PCI device after reset.\n");
4740                 return PCI_ERS_RESULT_DISCONNECT;
4741         }
4742         pci_set_master(pdev);
4743
4744         pci_enable_wake(pdev, PCI_D3hot, 0);
4745         pci_enable_wake(pdev, PCI_D3cold, 0);
4746
4747         e1000_reset(adapter);
4748         ew32(WUS, ~0);
4749
4750         return PCI_ERS_RESULT_RECOVERED;
4751 }
4752
4753 /**
4754  * e1000_io_resume - called when traffic can start flowing again.
4755  * @pdev: Pointer to PCI device
4756  *
4757  * This callback is called when the error recovery driver tells us that
4758  * its OK to resume normal operation. Implementation resembles the
4759  * second-half of the e1000_resume routine.
4760  */
4761 static void e1000_io_resume(struct pci_dev *pdev)
4762 {
4763         struct net_device *netdev = pci_get_drvdata(pdev);
4764         struct e1000_adapter *adapter = netdev_priv(netdev);
4765
4766         e1000_init_manageability(adapter);
4767
4768         if (netif_running(netdev)) {
4769                 if (e1000_up(adapter)) {
4770                         pr_info("can't bring device back up after reset\n");
4771                         return;
4772                 }
4773         }
4774
4775         netif_device_attach(netdev);
4776 }
4777
4778 /* e1000_main.c */