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-k5-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_init_module - Driver Registration Routine
 218  *
 219  * e1000_init_module is the first routine called when the driver is
 220  * loaded. All it does is register with the PCI subsystem.
 221  **/
 222
 223 static int __init e1000_init_module(void)
 224 {
 225         int ret;
 226         printk(KERN_INFO "%s - version %s\n",
 227                e1000_driver_string, e1000_driver_version);
 228
 229         printk(KERN_INFO "%s\n", e1000_copyright);
 230
 231         ret = pci_register_driver(&e1000_driver);
 232         if (copybreak != COPYBREAK_DEFAULT) {
 233                 if (copybreak == 0)
 234                         printk(KERN_INFO "e1000: copybreak disabled\n");
 235                 else
 236                         printk(KERN_INFO "e1000: copybreak enabled for "
 237                                "packets <= %u bytes\n", copybreak);
 238         }
 239         return ret;
 240 }
 241
 242 module_init(e1000_init_module);
 243
 244 /**
 245  * e1000_exit_module - Driver Exit Cleanup Routine
 246  *
 247  * e1000_exit_module is called just before the driver is removed
 248  * from memory.
 249  **/
 250
 251 static void __exit e1000_exit_module(void)
 252 {
 253         pci_unregister_driver(&e1000_driver);
 254 }
 255
 256 module_exit(e1000_exit_module);
 257
 258 static int e1000_request_irq(struct e1000_adapter *adapter)
 259 {
 260         struct net_device *netdev = adapter->netdev;
 261         irq_handler_t handler = e1000_intr;
 262         int irq_flags = IRQF_SHARED;
 263         int err;
 264
 265         err = request_irq(adapter->pdev->irq, handler, irq_flags, netdev->name,
 266                           netdev);
 267         if (err) {
 268                 DPRINTK(PROBE, ERR,
 269                         "Unable to allocate interrupt Error: %d\n", err);
 270         }
 271
 272         return err;
 273 }
 274
 275 static void e1000_free_irq(struct e1000_adapter *adapter)
 276 {
 277         struct net_device *netdev = adapter->netdev;
 278
 279         free_irq(adapter->pdev->irq, netdev);
 280 }
 281
 282 /**
 283  * e1000_irq_disable - Mask off interrupt generation on the NIC
 284  * @adapter: board private structure
 285  **/
 286
 287 static void e1000_irq_disable(struct e1000_adapter *adapter)
 288 {
 289         struct e1000_hw *hw = &adapter->hw;
 290
 291         ew32(IMC, ~0);
 292         E1000_WRITE_FLUSH();
 293         synchronize_irq(adapter->pdev->irq);
 294 }
 295
 296 /**
 297  * e1000_irq_enable - Enable default interrupt generation settings
 298  * @adapter: board private structure
 299  **/
 300
 301 static void e1000_irq_enable(struct e1000_adapter *adapter)
 302 {
 303         struct e1000_hw *hw = &adapter->hw;
 304
 305         ew32(IMS, IMS_ENABLE_MASK);
 306         E1000_WRITE_FLUSH();
 307 }
 308
 309 static void e1000_update_mng_vlan(struct e1000_adapter *adapter)
 310 {
 311         struct e1000_hw *hw = &adapter->hw;
 312         struct net_device *netdev = adapter->netdev;
 313         u16 vid = hw->mng_cookie.vlan_id;
 314         u16 old_vid = adapter->mng_vlan_id;
 315         if (adapter->vlgrp) {
 316                 if (!vlan_group_get_device(adapter->vlgrp, vid)) {
 317                         if (hw->mng_cookie.status &
 318                                 E1000_MNG_DHCP_COOKIE_STATUS_VLAN_SUPPORT) {
 319                                 e1000_vlan_rx_add_vid(netdev, vid);
 320                                 adapter->mng_vlan_id = vid;
 321                         } else
 322                                 adapter->mng_vlan_id = E1000_MNG_VLAN_NONE;
 323
 324                         if ((old_vid != (u16)E1000_MNG_VLAN_NONE) &&
 325                                         (vid != old_vid) &&
 326                             !vlan_group_get_device(adapter->vlgrp, old_vid))
 327                                 e1000_vlan_rx_kill_vid(netdev, old_vid);
 328                 } else
 329                         adapter->mng_vlan_id = vid;
 330         }
 331 }
 332
 333 static void e1000_init_manageability(struct e1000_adapter *adapter)
 334 {
 335         struct e1000_hw *hw = &adapter->hw;
 336
 337         if (adapter->en_mng_pt) {
 338                 u32 manc = er32(MANC);
 339
 340                 /* disable hardware interception of ARP */
 341                 manc &= ~(E1000_MANC_ARP_EN);
 342
 343                 ew32(MANC, manc);
 344         }
 345 }
 346
 347 static void e1000_release_manageability(struct e1000_adapter *adapter)
 348 {
 349         struct e1000_hw *hw = &adapter->hw;
 350
 351         if (adapter->en_mng_pt) {
 352                 u32 manc = er32(MANC);
 353
 354                 /* re-enable hardware interception of ARP */
 355                 manc |= E1000_MANC_ARP_EN;
 356
 357                 ew32(MANC, manc);
 358         }
 359 }
 360
 361 /**
 362  * e1000_configure - configure the hardware for RX and TX
 363  * @adapter = private board structure
 364  **/
 365 static void e1000_configure(struct e1000_adapter *adapter)
 366 {
 367         struct net_device *netdev = adapter->netdev;
 368         int i;
 369
 370         e1000_set_rx_mode(netdev);
 371
 372         e1000_restore_vlan(adapter);
 373         e1000_init_manageability(adapter);
 374
 375         e1000_configure_tx(adapter);
 376         e1000_setup_rctl(adapter);
 377         e1000_configure_rx(adapter);
 378         /* call E1000_DESC_UNUSED which always leaves
 379          * at least 1 descriptor unused to make sure
 380          * next_to_use != next_to_clean */
 381         for (i = 0; i < adapter->num_rx_queues; i++) {
 382                 struct e1000_rx_ring *ring = &adapter->rx_ring[i];
 383                 adapter->alloc_rx_buf(adapter, ring,
 384                                       E1000_DESC_UNUSED(ring));
 385         }
 386 }
 387
 388 int e1000_up(struct e1000_adapter *adapter)
 389 {
 390         struct e1000_hw *hw = &adapter->hw;
 391
 392         /* hardware has been reset, we need to reload some things */
 393         e1000_configure(adapter);
 394
 395         clear_bit(__E1000_DOWN, &adapter->flags);
 396
 397         napi_enable(&adapter->napi);
 398
 399         e1000_irq_enable(adapter);
 400
 401         netif_wake_queue(adapter->netdev);
 402
 403         /* fire a link change interrupt to start the watchdog */
 404         ew32(ICS, E1000_ICS_LSC);
 405         return 0;
 406 }
 407
 408 /**
 409  * e1000_power_up_phy - restore link in case the phy was powered down
 410  * @adapter: address of board private structure
 411  *
 412  * The phy may be powered down to save power and turn off link when the
 413  * driver is unloaded and wake on lan is not enabled (among others)
 414  * *** this routine MUST be followed by a call to e1000_reset ***
 415  *
 416  **/
 417
 418 void e1000_power_up_phy(struct e1000_adapter *adapter)
 419 {
 420         struct e1000_hw *hw = &adapter->hw;
 421         u16 mii_reg = 0;
 422
 423         /* Just clear the power down bit to wake the phy back up */
 424         if (hw->media_type == e1000_media_type_copper) {
 425                 /* according to the manual, the phy will retain its
 426                  * settings across a power-down/up cycle */
 427                 e1000_read_phy_reg(hw, PHY_CTRL, &mii_reg);
 428                 mii_reg &= ~MII_CR_POWER_DOWN;
 429                 e1000_write_phy_reg(hw, PHY_CTRL, mii_reg);
 430         }
 431 }
 432
 433 static void e1000_power_down_phy(struct e1000_adapter *adapter)
 434 {
 435         struct e1000_hw *hw = &adapter->hw;
 436
 437         /* Power down the PHY so no link is implied when interface is down *
 438          * The PHY cannot be powered down if any of the following is true *
 439          * (a) WoL is enabled
 440          * (b) AMT is active
 441          * (c) SoL/IDER session is active */
 442         if (!adapter->wol && hw->mac_type >= e1000_82540 &&
 443            hw->media_type == e1000_media_type_copper) {
 444                 u16 mii_reg = 0;
 445
 446                 switch (hw->mac_type) {
 447                 case e1000_82540:
 448                 case e1000_82545:
 449                 case e1000_82545_rev_3:
 450                 case e1000_82546:
 451                 case e1000_82546_rev_3:
 452                 case e1000_82541:
 453                 case e1000_82541_rev_2:
 454                 case e1000_82547:
 455                 case e1000_82547_rev_2:
 456                         if (er32(MANC) & E1000_MANC_SMBUS_EN)
 457                                 goto out;
 458                         break;
 459                 default:
 460                         goto out;
 461                 }
 462                 e1000_read_phy_reg(hw, PHY_CTRL, &mii_reg);
 463                 mii_reg |= MII_CR_POWER_DOWN;
 464                 e1000_write_phy_reg(hw, PHY_CTRL, mii_reg);
 465                 mdelay(1);
 466         }
 467 out:
 468         return;
 469 }
 470
 471 void e1000_down(struct e1000_adapter *adapter)
 472 {
 473         struct e1000_hw *hw = &adapter->hw;
 474         struct net_device *netdev = adapter->netdev;
 475         u32 rctl, tctl;
 476
 477         /* signal that we're down so the interrupt handler does not
 478          * reschedule our watchdog timer */
 479         set_bit(__E1000_DOWN, &adapter->flags);
 480
 481         /* disable receives in the hardware */
 482         rctl = er32(RCTL);
 483         ew32(RCTL, rctl & ~E1000_RCTL_EN);
 484         /* flush and sleep below */
 485
 486         netif_tx_disable(netdev);
 487
 488         /* disable transmits in the hardware */
 489         tctl = er32(TCTL);
 490         tctl &= ~E1000_TCTL_EN;
 491         ew32(TCTL, tctl);
 492         /* flush both disables and wait for them to finish */
 493         E1000_WRITE_FLUSH();
 494         msleep(10);
 495
 496         napi_disable(&adapter->napi);
 497
 498         e1000_irq_disable(adapter);
 499
 500         del_timer_sync(&adapter->tx_fifo_stall_timer);
 501         del_timer_sync(&adapter->watchdog_timer);
 502         del_timer_sync(&adapter->phy_info_timer);
 503
 504         adapter->link_speed = 0;
 505         adapter->link_duplex = 0;
 506         netif_carrier_off(netdev);
 507
 508         e1000_reset(adapter);
 509         e1000_clean_all_tx_rings(adapter);
 510         e1000_clean_all_rx_rings(adapter);
 511 }
 512
 513 void e1000_reinit_locked(struct e1000_adapter *adapter)
 514 {
 515         WARN_ON(in_interrupt());
 516         while (test_and_set_bit(__E1000_RESETTING, &adapter->flags))
 517                 msleep(1);
 518         e1000_down(adapter);
 519         e1000_up(adapter);
 520         clear_bit(__E1000_RESETTING, &adapter->flags);
 521 }
 522
 523 void e1000_reset(struct e1000_adapter *adapter)
 524 {
 525         struct e1000_hw *hw = &adapter->hw;
 526         u32 pba = 0, tx_space, min_tx_space, min_rx_space;
 527         bool legacy_pba_adjust = false;
 528         u16 hwm;
 529
 530         /* Repartition Pba for greater than 9k mtu
 531          * To take effect CTRL.RST is required.
 532          */
 533
 534         switch (hw->mac_type) {
 535         case e1000_82542_rev2_0:
 536         case e1000_82542_rev2_1:
 537         case e1000_82543:
 538         case e1000_82544:
 539         case e1000_82540:
 540         case e1000_82541:
 541         case e1000_82541_rev_2:
 542                 legacy_pba_adjust = true;
 543                 pba = E1000_PBA_48K;
 544                 break;
 545         case e1000_82545:
 546         case e1000_82545_rev_3:
 547         case e1000_82546:
 548         case e1000_82546_rev_3:
 549                 pba = E1000_PBA_48K;
 550                 break;
 551         case e1000_82547:
 552         case e1000_82547_rev_2:
 553                 legacy_pba_adjust = true;
 554                 pba = E1000_PBA_30K;
 555                 break;
 556         case e1000_undefined:
 557         case e1000_num_macs:
 558                 break;
 559         }
 560
 561         if (legacy_pba_adjust) {
 562                 if (hw->max_frame_size > E1000_RXBUFFER_8192)
 563                         pba -= 8; /* allocate more FIFO for Tx */
 564
 565                 if (hw->mac_type == e1000_82547) {
 566                         adapter->tx_fifo_head = 0;
 567                         adapter->tx_head_addr = pba << E1000_TX_HEAD_ADDR_SHIFT;
 568                         adapter->tx_fifo_size =
 569                                 (E1000_PBA_40K - pba) << E1000_PBA_BYTES_SHIFT;
 570                         atomic_set(&adapter->tx_fifo_stall, 0);
 571                 }
 572         } else if (hw->max_frame_size >  ETH_FRAME_LEN + ETH_FCS_LEN) {
 573                 /* adjust PBA for jumbo frames */
 574                 ew32(PBA, pba);
 575
 576                 /* To maintain wire speed transmits, the Tx FIFO should be
 577                  * large enough to accommodate two full transmit packets,
 578                  * rounded up to the next 1KB and expressed in KB.  Likewise,
 579                  * the Rx FIFO should be large enough to accommodate at least
 580                  * one full receive packet and is similarly rounded up and
 581                  * expressed in KB. */
 582                 pba = er32(PBA);
 583                 /* upper 16 bits has Tx packet buffer allocation size in KB */
 584                 tx_space = pba >> 16;
 585                 /* lower 16 bits has Rx packet buffer allocation size in KB */
 586                 pba &= 0xffff;
 587                 /*
 588                  * the tx fifo also stores 16 bytes of information about the tx
 589                  * but don't include ethernet FCS because hardware appends it
 590                  */
 591                 min_tx_space = (hw->max_frame_size +
 592                                 sizeof(struct e1000_tx_desc) -
 593                                 ETH_FCS_LEN) * 2;
 594                 min_tx_space = ALIGN(min_tx_space, 1024);
 595                 min_tx_space >>= 10;
 596                 /* software strips receive CRC, so leave room for it */
 597                 min_rx_space = hw->max_frame_size;
 598                 min_rx_space = ALIGN(min_rx_space, 1024);
 599                 min_rx_space >>= 10;
 600
 601                 /* If current Tx allocation is less than the min Tx FIFO size,
 602                  * and the min Tx FIFO size is less than the current Rx FIFO
 603                  * allocation, take space away from current Rx allocation */
 604                 if (tx_space < min_tx_space &&
 605                     ((min_tx_space - tx_space) < pba)) {
 606                         pba = pba - (min_tx_space - tx_space);
 607
 608                         /* PCI/PCIx hardware has PBA alignment constraints */
 609                         switch (hw->mac_type) {
 610                         case e1000_82545 ... e1000_82546_rev_3:
 611                                 pba &= ~(E1000_PBA_8K - 1);
 612                                 break;
 613                         default:
 614                                 break;
 615                         }
 616
 617                         /* if short on rx space, rx wins and must trump tx
 618                          * adjustment or use Early Receive if available */
 619                         if (pba < min_rx_space)
 620                                 pba = min_rx_space;
 621                 }
 622         }
 623
 624         ew32(PBA, pba);
 625
 626         /*
 627          * flow control settings:
 628          * The high water mark must be low enough to fit one full frame
 629          * (or the size used for early receive) above it in the Rx FIFO.
 630          * Set it to the lower of:
 631          * - 90% of the Rx FIFO size, and
 632          * - the full Rx FIFO size minus the early receive size (for parts
 633          *   with ERT support assuming ERT set to E1000_ERT_2048), or
 634          * - the full Rx FIFO size minus one full frame
 635          */
 636         hwm = min(((pba << 10) * 9 / 10),
 637                   ((pba << 10) - hw->max_frame_size));
 638
 639         hw->fc_high_water = hwm & 0xFFF8;       /* 8-byte granularity */
 640         hw->fc_low_water = hw->fc_high_water - 8;
 641         hw->fc_pause_time = E1000_FC_PAUSE_TIME;
 642         hw->fc_send_xon = 1;
 643         hw->fc = hw->original_fc;
 644
 645         /* Allow time for pending master requests to run */
 646         e1000_reset_hw(hw);
 647         if (hw->mac_type >= e1000_82544)
 648                 ew32(WUC, 0);
 649
 650         if (e1000_init_hw(hw))
 651                 DPRINTK(PROBE, ERR, "Hardware Error\n");
 652         e1000_update_mng_vlan(adapter);
 653
 654         /* if (adapter->hwflags & HWFLAGS_PHY_PWR_BIT) { */
 655         if (hw->mac_type >= e1000_82544 &&
 656             hw->autoneg == 1 &&
 657             hw->autoneg_advertised == ADVERTISE_1000_FULL) {
 658                 u32 ctrl = er32(CTRL);
 659                 /* clear phy power management bit if we are in gig only mode,
 660                  * which if enabled will attempt negotiation to 100Mb, which
 661                  * can cause a loss of link at power off or driver unload */
 662                 ctrl &= ~E1000_CTRL_SWDPIN3;
 663                 ew32(CTRL, ctrl);
 664         }
 665
 666         /* Enable h/w to recognize an 802.1Q VLAN Ethernet packet */
 667         ew32(VET, ETHERNET_IEEE_VLAN_TYPE);
 668
 669         e1000_reset_adaptive(hw);
 670         e1000_phy_get_info(hw, &adapter->phy_info);
 671
 672         e1000_release_manageability(adapter);
 673 }
 674
 675 /**
 676  *  Dump the eeprom for users having checksum issues
 677  **/
 678 static void e1000_dump_eeprom(struct e1000_adapter *adapter)
 679 {
 680         struct net_device *netdev = adapter->netdev;
 681         struct ethtool_eeprom eeprom;
 682         const struct ethtool_ops *ops = netdev->ethtool_ops;
 683         u8 *data;
 684         int i;
 685         u16 csum_old, csum_new = 0;
 686
 687         eeprom.len = ops->get_eeprom_len(netdev);
 688         eeprom.offset = 0;
 689
 690         data = kmalloc(eeprom.len, GFP_KERNEL);
 691         if (!data) {
 692                 printk(KERN_ERR "Unable to allocate memory to dump EEPROM"
 693                        " data\n");
 694                 return;
 695         }
 696
 697         ops->get_eeprom(netdev, &eeprom, data);
 698
 699         csum_old = (data[EEPROM_CHECKSUM_REG * 2]) +
 700                    (data[EEPROM_CHECKSUM_REG * 2 + 1] << 8);
 701         for (i = 0; i < EEPROM_CHECKSUM_REG * 2; i += 2)
 702                 csum_new += data[i] + (data[i + 1] << 8);
 703         csum_new = EEPROM_SUM - csum_new;
 704
 705         printk(KERN_ERR "/*********************/\n");
 706         printk(KERN_ERR "Current EEPROM Checksum : 0x%04x\n", csum_old);
 707         printk(KERN_ERR "Calculated              : 0x%04x\n", csum_new);
 708
 709         printk(KERN_ERR "Offset    Values\n");
 710         printk(KERN_ERR "========  ======\n");
 711         print_hex_dump(KERN_ERR, "", DUMP_PREFIX_OFFSET, 16, 1, data, 128, 0);
 712
 713         printk(KERN_ERR "Include this output when contacting your support "
 714                "provider.\n");
 715         printk(KERN_ERR "This is not a software error! Something bad "
 716                "happened to your hardware or\n");
 717         printk(KERN_ERR "EEPROM image. Ignoring this "
 718                "problem could result in further problems,\n");
 719         printk(KERN_ERR "possibly loss of data, corruption or system hangs!\n");
 720         printk(KERN_ERR "The MAC Address will be reset to 00:00:00:00:00:00, "
 721                "which is invalid\n");
 722         printk(KERN_ERR "and requires you to set the proper MAC "
 723                "address manually before continuing\n");
 724         printk(KERN_ERR "to enable this network device.\n");
 725         printk(KERN_ERR "Please inspect the EEPROM dump and report the issue "
 726                "to your hardware vendor\n");
 727         printk(KERN_ERR "or Intel Customer Support.\n");
 728         printk(KERN_ERR "/*********************/\n");
 729
 730         kfree(data);
 731 }
 732
 733 /**
 734  * e1000_is_need_ioport - determine if an adapter needs ioport resources or not
 735  * @pdev: PCI device information struct
 736  *
 737  * Return true if an adapter needs ioport resources
 738  **/
 739 static int e1000_is_need_ioport(struct pci_dev *pdev)
 740 {
 741         switch (pdev->device) {
 742         case E1000_DEV_ID_82540EM:
 743         case E1000_DEV_ID_82540EM_LOM:
 744         case E1000_DEV_ID_82540EP:
 745         case E1000_DEV_ID_82540EP_LOM:
 746         case E1000_DEV_ID_82540EP_LP:
 747         case E1000_DEV_ID_82541EI:
 748         case E1000_DEV_ID_82541EI_MOBILE:
 749         case E1000_DEV_ID_82541ER:
 750         case E1000_DEV_ID_82541ER_LOM:
 751         case E1000_DEV_ID_82541GI:
 752         case E1000_DEV_ID_82541GI_LF:
 753         case E1000_DEV_ID_82541GI_MOBILE:
 754         case E1000_DEV_ID_82544EI_COPPER:
 755         case E1000_DEV_ID_82544EI_FIBER:
 756         case E1000_DEV_ID_82544GC_COPPER:
 757         case E1000_DEV_ID_82544GC_LOM:
 758         case E1000_DEV_ID_82545EM_COPPER:
 759         case E1000_DEV_ID_82545EM_FIBER:
 760         case E1000_DEV_ID_82546EB_COPPER:
 761         case E1000_DEV_ID_82546EB_FIBER:
 762         case E1000_DEV_ID_82546EB_QUAD_COPPER:
 763                 return true;
 764         default:
 765                 return false;
 766         }
 767 }
 768
 769 static const struct net_device_ops e1000_netdev_ops = {
 770         .ndo_open               = e1000_open,
 771         .ndo_stop               = e1000_close,
 772         .ndo_start_xmit         = e1000_xmit_frame,
 773         .ndo_get_stats          = e1000_get_stats,
 774         .ndo_set_rx_mode        = e1000_set_rx_mode,
 775         .ndo_set_mac_address    = e1000_set_mac,
 776         .ndo_tx_timeout         = e1000_tx_timeout,
 777         .ndo_change_mtu         = e1000_change_mtu,
 778         .ndo_do_ioctl           = e1000_ioctl,
 779         .ndo_validate_addr      = eth_validate_addr,
 780
 781         .ndo_vlan_rx_register   = e1000_vlan_rx_register,
 782         .ndo_vlan_rx_add_vid    = e1000_vlan_rx_add_vid,
 783         .ndo_vlan_rx_kill_vid   = e1000_vlan_rx_kill_vid,
 784 #ifdef CONFIG_NET_POLL_CONTROLLER
 785         .ndo_poll_controller    = e1000_netpoll,
 786 #endif
 787 };
 788
 789 /**
 790  * e1000_probe - Device Initialization Routine
 791  * @pdev: PCI device information struct
 792  * @ent: entry in e1000_pci_tbl
 793  *
 794  * Returns 0 on success, negative on failure
 795  *
 796  * e1000_probe initializes an adapter identified by a pci_dev structure.
 797  * The OS initialization, configuring of the adapter private structure,
 798  * and a hardware reset occur.
 799  **/
 800 static int __devinit e1000_probe(struct pci_dev *pdev,
 801                                  const struct pci_device_id *ent)
 802 {
 803         struct net_device *netdev;
 804         struct e1000_adapter *adapter;
 805         struct e1000_hw *hw;
 806
 807         static int cards_found = 0;
 808         static int global_quad_port_a = 0; /* global ksp3 port a indication */
 809         int i, err, pci_using_dac;
 810         u16 eeprom_data = 0;
 811         u16 eeprom_apme_mask = E1000_EEPROM_APME;
 812         int bars, need_ioport;
 813
 814         /* do not allocate ioport bars when not needed */
 815         need_ioport = e1000_is_need_ioport(pdev);
 816         if (need_ioport) {
 817                 bars = pci_select_bars(pdev, IORESOURCE_MEM | IORESOURCE_IO);
 818                 err = pci_enable_device(pdev);
 819         } else {
 820                 bars = pci_select_bars(pdev, IORESOURCE_MEM);
 821                 err = pci_enable_device_mem(pdev);
 822         }
 823         if (err)
 824                 return err;
 825
 826         if (!pci_set_dma_mask(pdev, DMA_BIT_MASK(64)) &&
 827             !pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(64))) {
 828                 pci_using_dac = 1;
 829         } else {
 830                 err = pci_set_dma_mask(pdev, DMA_BIT_MASK(32));
 831                 if (err) {
 832                         err = pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(32));
 833                         if (err) {
 834                                 E1000_ERR("No usable DMA configuration, "
 835                                           "aborting\n");
 836                                 goto err_dma;
 837                         }
 838                 }
 839                 pci_using_dac = 0;
 840         }
 841
 842         err = pci_request_selected_regions(pdev, bars, e1000_driver_name);
 843         if (err)
 844                 goto err_pci_reg;
 845
 846         pci_set_master(pdev);
 847         err = pci_save_state(pdev);
 848         if (err)
 849                 goto err_alloc_etherdev;
 850
 851         err = -ENOMEM;
 852         netdev = alloc_etherdev(sizeof(struct e1000_adapter));
 853         if (!netdev)
 854                 goto err_alloc_etherdev;
 855
 856         SET_NETDEV_DEV(netdev, &pdev->dev);
 857
 858         pci_set_drvdata(pdev, netdev);
 859         adapter = netdev_priv(netdev);
 860         adapter->netdev = netdev;
 861         adapter->pdev = pdev;
 862         adapter->msg_enable = (1 << debug) - 1;
 863         adapter->bars = bars;
 864         adapter->need_ioport = need_ioport;
 865
 866         hw = &adapter->hw;
 867         hw->back = adapter;
 868
 869         err = -EIO;
 870         hw->hw_addr = pci_ioremap_bar(pdev, BAR_0);
 871         if (!hw->hw_addr)
 872                 goto err_ioremap;
 873
 874         if (adapter->need_ioport) {
 875                 for (i = BAR_1; i <= BAR_5; i++) {
 876                         if (pci_resource_len(pdev, i) == 0)
 877                                 continue;
 878                         if (pci_resource_flags(pdev, i) & IORESOURCE_IO) {
 879                                 hw->io_base = pci_resource_start(pdev, i);
 880                                 break;
 881                         }
 882                 }
 883         }
 884
 885         netdev->netdev_ops = &e1000_netdev_ops;
 886         e1000_set_ethtool_ops(netdev);
 887         netdev->watchdog_timeo = 5 * HZ;
 888         netif_napi_add(netdev, &adapter->napi, e1000_clean, 64);
 889
 890         strncpy(netdev->name, pci_name(pdev), sizeof(netdev->name) - 1);
 891
 892         adapter->bd_number = cards_found;
 893
 894         /* setup the private structure */
 895
 896         err = e1000_sw_init(adapter);
 897         if (err)
 898                 goto err_sw_init;
 899
 900         err = -EIO;
 901
 902         if (hw->mac_type >= e1000_82543) {
 903                 netdev->features = NETIF_F_SG |
 904                                    NETIF_F_HW_CSUM |
 905                                    NETIF_F_HW_VLAN_TX |
 906                                    NETIF_F_HW_VLAN_RX |
 907                                    NETIF_F_HW_VLAN_FILTER;
 908         }
 909
 910         if ((hw->mac_type >= e1000_82544) &&
 911            (hw->mac_type != e1000_82547))
 912                 netdev->features |= NETIF_F_TSO;
 913
 914         if (pci_using_dac)
 915                 netdev->features |= NETIF_F_HIGHDMA;
 916
 917         netdev->vlan_features |= NETIF_F_TSO;
 918         netdev->vlan_features |= NETIF_F_HW_CSUM;
 919         netdev->vlan_features |= NETIF_F_SG;
 920
 921         adapter->en_mng_pt = e1000_enable_mng_pass_thru(hw);
 922
 923         /* initialize eeprom parameters */
 924         if (e1000_init_eeprom_params(hw)) {
 925                 E1000_ERR("EEPROM initialization failed\n");
 926                 goto err_eeprom;
 927         }
 928
 929         /* before reading the EEPROM, reset the controller to
 930          * put the device in a known good starting state */
 931
 932         e1000_reset_hw(hw);
 933
 934         /* make sure the EEPROM is good */
 935         if (e1000_validate_eeprom_checksum(hw) < 0) {
 936                 DPRINTK(PROBE, ERR, "The EEPROM Checksum Is Not Valid\n");
 937                 e1000_dump_eeprom(adapter);
 938                 /*
 939                  * set MAC address to all zeroes to invalidate and temporary
 940                  * disable this device for the user. This blocks regular
 941                  * traffic while still permitting ethtool ioctls from reaching
 942                  * the hardware as well as allowing the user to run the
 943                  * interface after manually setting a hw addr using
 944                  * `ip set address`
 945                  */
 946                 memset(hw->mac_addr, 0, netdev->addr_len);
 947         } else {
 948                 /* copy the MAC address out of the EEPROM */
 949                 if (e1000_read_mac_addr(hw))
 950                         DPRINTK(PROBE, ERR, "EEPROM Read Error\n");
 951         }
 952         /* don't block initalization here due to bad MAC address */
 953         memcpy(netdev->dev_addr, hw->mac_addr, netdev->addr_len);
 954         memcpy(netdev->perm_addr, hw->mac_addr, netdev->addr_len);
 955
 956         if (!is_valid_ether_addr(netdev->perm_addr))
 957                 DPRINTK(PROBE, ERR, "Invalid MAC Address\n");
 958
 959         e1000_get_bus_info(hw);
 960
 961         init_timer(&adapter->tx_fifo_stall_timer);
 962         adapter->tx_fifo_stall_timer.function = &e1000_82547_tx_fifo_stall;
 963         adapter->tx_fifo_stall_timer.data = (unsigned long)adapter;
 964
 965         init_timer(&adapter->watchdog_timer);
 966         adapter->watchdog_timer.function = &e1000_watchdog;
 967         adapter->watchdog_timer.data = (unsigned long) adapter;
 968
 969         init_timer(&adapter->phy_info_timer);
 970         adapter->phy_info_timer.function = &e1000_update_phy_info;
 971         adapter->phy_info_timer.data = (unsigned long)adapter;
 972
 973         INIT_WORK(&adapter->reset_task, e1000_reset_task);
 974
 975         e1000_check_options(adapter);
 976
 977         /* Initial Wake on LAN setting
 978          * If APM wake is enabled in the EEPROM,
 979          * enable the ACPI Magic Packet filter
 980          */
 981
 982         switch (hw->mac_type) {
 983         case e1000_82542_rev2_0:
 984         case e1000_82542_rev2_1:
 985         case e1000_82543:
 986                 break;
 987         case e1000_82544:
 988                 e1000_read_eeprom(hw,
 989                         EEPROM_INIT_CONTROL2_REG, 1, &eeprom_data);
 990                 eeprom_apme_mask = E1000_EEPROM_82544_APM;
 991                 break;
 992         case e1000_82546:
 993         case e1000_82546_rev_3:
 994                 if (er32(STATUS) & E1000_STATUS_FUNC_1){
 995                         e1000_read_eeprom(hw,
 996                                 EEPROM_INIT_CONTROL3_PORT_B, 1, &eeprom_data);
 997                         break;
 998                 }
 999                 /* Fall Through */
1000         default:
1001                 e1000_read_eeprom(hw,
1002                         EEPROM_INIT_CONTROL3_PORT_A, 1, &eeprom_data);
1003                 break;
1004         }
1005         if (eeprom_data & eeprom_apme_mask)
1006                 adapter->eeprom_wol |= E1000_WUFC_MAG;
1007
1008         /* now that we have the eeprom settings, apply the special cases
1009          * where the eeprom may be wrong or the board simply won't support
1010          * wake on lan on a particular port */
1011         switch (pdev->device) {
1012         case E1000_DEV_ID_82546GB_PCIE:
1013                 adapter->eeprom_wol = 0;
1014                 break;
1015         case E1000_DEV_ID_82546EB_FIBER:
1016         case E1000_DEV_ID_82546GB_FIBER:
1017                 /* Wake events only supported on port A for dual fiber
1018                  * regardless of eeprom setting */
1019                 if (er32(STATUS) & E1000_STATUS_FUNC_1)
1020                         adapter->eeprom_wol = 0;
1021                 break;
1022         case E1000_DEV_ID_82546GB_QUAD_COPPER_KSP3:
1023                 /* if quad port adapter, disable WoL on all but port A */
1024                 if (global_quad_port_a != 0)
1025                         adapter->eeprom_wol = 0;
1026                 else
1027                         adapter->quad_port_a = 1;
1028                 /* Reset for multiple quad port adapters */
1029                 if (++global_quad_port_a == 4)
1030                         global_quad_port_a = 0;
1031                 break;
1032         }
1033
1034         /* initialize the wol settings based on the eeprom settings */
1035         adapter->wol = adapter->eeprom_wol;
1036         device_set_wakeup_enable(&adapter->pdev->dev, adapter->wol);
1037
1038         /* print bus type/speed/width info */
1039         DPRINTK(PROBE, INFO, "(PCI%s:%s:%s) ",
1040                 ((hw->bus_type == e1000_bus_type_pcix) ? "-X" : ""),
1041                 ((hw->bus_speed == e1000_bus_speed_133) ? "133MHz" :
1042                  (hw->bus_speed == e1000_bus_speed_120) ? "120MHz" :
1043                  (hw->bus_speed == e1000_bus_speed_100) ? "100MHz" :
1044                  (hw->bus_speed == e1000_bus_speed_66) ? "66MHz" : "33MHz"),
1045                 ((hw->bus_width == e1000_bus_width_64) ? "64-bit" : "32-bit"));
1046
1047         printk("%pM\n", netdev->dev_addr);
1048
1049         /* reset the hardware with the new settings */
1050         e1000_reset(adapter);
1051
1052         strcpy(netdev->name, "eth%d");
1053         err = register_netdev(netdev);
1054         if (err)
1055                 goto err_register;
1056
1057         /* carrier off reporting is important to ethtool even BEFORE open */
1058         netif_carrier_off(netdev);
1059
1060         DPRINTK(PROBE, INFO, "Intel(R) PRO/1000 Network Connection\n");
1061
1062         cards_found++;
1063         return 0;
1064
1065 err_register:
1066 err_eeprom:
1067         e1000_phy_hw_reset(hw);
1068
1069         if (hw->flash_address)
1070                 iounmap(hw->flash_address);
1071         kfree(adapter->tx_ring);
1072         kfree(adapter->rx_ring);
1073 err_sw_init:
1074         iounmap(hw->hw_addr);
1075 err_ioremap:
1076         free_netdev(netdev);
1077 err_alloc_etherdev:
1078         pci_release_selected_regions(pdev, bars);
1079 err_pci_reg:
1080 err_dma:
1081         pci_disable_device(pdev);
1082         return err;
1083 }
1084
1085 /**
1086  * e1000_remove - Device Removal Routine
1087  * @pdev: PCI device information struct
1088  *
1089  * e1000_remove is called by the PCI subsystem to alert the driver
1090  * that it should release a PCI device.  The could be caused by a
1091  * Hot-Plug event, or because the driver is going to be removed from
1092  * memory.
1093  **/
1094
1095 static void __devexit e1000_remove(struct pci_dev *pdev)
1096 {
1097         struct net_device *netdev = pci_get_drvdata(pdev);
1098         struct e1000_adapter *adapter = netdev_priv(netdev);
1099         struct e1000_hw *hw = &adapter->hw;
1100
1101         set_bit(__E1000_DOWN, &adapter->flags);
1102         del_timer_sync(&adapter->tx_fifo_stall_timer);
1103         del_timer_sync(&adapter->watchdog_timer);
1104         del_timer_sync(&adapter->phy_info_timer);
1105
1106         cancel_work_sync(&adapter->reset_task);
1107
1108         e1000_release_manageability(adapter);
1109
1110         unregister_netdev(netdev);
1111
1112         e1000_phy_hw_reset(hw);
1113
1114         kfree(adapter->tx_ring);
1115         kfree(adapter->rx_ring);
1116
1117         iounmap(hw->hw_addr);
1118         if (hw->flash_address)
1119                 iounmap(hw->flash_address);
1120         pci_release_selected_regions(pdev, adapter->bars);
1121
1122         free_netdev(netdev);
1123
1124         pci_disable_device(pdev);
1125 }
1126
1127 /**
1128  * e1000_sw_init - Initialize general software structures (struct e1000_adapter)
1129  * @adapter: board private structure to initialize
1130  *
1131  * e1000_sw_init initializes the Adapter private data structure.
1132  * Fields are initialized based on PCI device information and
1133  * OS network device settings (MTU size).
1134  **/
1135
1136 static int __devinit e1000_sw_init(struct e1000_adapter *adapter)
1137 {
1138         struct e1000_hw *hw = &adapter->hw;
1139         struct net_device *netdev = adapter->netdev;
1140         struct pci_dev *pdev = adapter->pdev;
1141
1142         /* PCI config space info */
1143
1144         hw->vendor_id = pdev->vendor;
1145         hw->device_id = pdev->device;
1146         hw->subsystem_vendor_id = pdev->subsystem_vendor;
1147         hw->subsystem_id = pdev->subsystem_device;
1148         hw->revision_id = pdev->revision;
1149
1150         pci_read_config_word(pdev, PCI_COMMAND, &hw->pci_cmd_word);
1151
1152         adapter->rx_buffer_len = MAXIMUM_ETHERNET_VLAN_SIZE;
1153         hw->max_frame_size = netdev->mtu +
1154                              ENET_HEADER_SIZE + ETHERNET_FCS_SIZE;
1155         hw->min_frame_size = MINIMUM_ETHERNET_FRAME_SIZE;
1156
1157         /* identify the MAC */
1158
1159         if (e1000_set_mac_type(hw)) {
1160                 DPRINTK(PROBE, ERR, "Unknown MAC Type\n");
1161                 return -EIO;
1162         }
1163
1164         switch (hw->mac_type) {
1165         default:
1166                 break;
1167         case e1000_82541:
1168         case e1000_82547:
1169         case e1000_82541_rev_2:
1170         case e1000_82547_rev_2:
1171                 hw->phy_init_script = 1;
1172                 break;
1173         }
1174
1175         e1000_set_media_type(hw);
1176
1177         hw->wait_autoneg_complete = false;
1178         hw->tbi_compatibility_en = true;
1179         hw->adaptive_ifs = true;
1180
1181         /* Copper options */
1182
1183         if (hw->media_type == e1000_media_type_copper) {
1184                 hw->mdix = AUTO_ALL_MODES;
1185                 hw->disable_polarity_correction = false;
1186                 hw->master_slave = E1000_MASTER_SLAVE;
1187         }
1188
1189         adapter->num_tx_queues = 1;
1190         adapter->num_rx_queues = 1;
1191
1192         if (e1000_alloc_queues(adapter)) {
1193                 DPRINTK(PROBE, ERR, "Unable to allocate memory for queues\n");
1194                 return -ENOMEM;
1195         }
1196
1197         /* Explicitly disable IRQ since the NIC can be in any state. */
1198         e1000_irq_disable(adapter);
1199
1200         spin_lock_init(&adapter->stats_lock);
1201
1202         set_bit(__E1000_DOWN, &adapter->flags);
1203
1204         return 0;
1205 }
1206
1207 /**
1208  * e1000_alloc_queues - Allocate memory for all rings
1209  * @adapter: board private structure to initialize
1210  *
1211  * We allocate one ring per queue at run-time since we don't know the
1212  * number of queues at compile-time.
1213  **/
1214
1215 static int __devinit e1000_alloc_queues(struct e1000_adapter *adapter)
1216 {
1217         adapter->tx_ring = kcalloc(adapter->num_tx_queues,
1218                                    sizeof(struct e1000_tx_ring), GFP_KERNEL);
1219         if (!adapter->tx_ring)
1220                 return -ENOMEM;
1221
1222         adapter->rx_ring = kcalloc(adapter->num_rx_queues,
1223                                    sizeof(struct e1000_rx_ring), GFP_KERNEL);
1224         if (!adapter->rx_ring) {
1225                 kfree(adapter->tx_ring);
1226                 return -ENOMEM;
1227         }
1228
1229         return E1000_SUCCESS;
1230 }
1231
1232 /**
1233  * e1000_open - Called when a network interface is made active
1234  * @netdev: network interface device structure
1235  *
1236  * Returns 0 on success, negative value on failure
1237  *
1238  * The open entry point is called when a network interface is made
1239  * active by the system (IFF_UP).  At this point all resources needed
1240  * for transmit and receive operations are allocated, the interrupt
1241  * handler is registered with the OS, the watchdog timer is started,
1242  * and the stack is notified that the interface is ready.
1243  **/
1244
1245 static int e1000_open(struct net_device *netdev)
1246 {
1247         struct e1000_adapter *adapter = netdev_priv(netdev);
1248         struct e1000_hw *hw = &adapter->hw;
1249         int err;
1250
1251         /* disallow open during test */
1252         if (test_bit(__E1000_TESTING, &adapter->flags))
1253                 return -EBUSY;
1254
1255         netif_carrier_off(netdev);
1256
1257         /* allocate transmit descriptors */
1258         err = e1000_setup_all_tx_resources(adapter);
1259         if (err)
1260                 goto err_setup_tx;
1261
1262         /* allocate receive descriptors */
1263         err = e1000_setup_all_rx_resources(adapter);
1264         if (err)
1265                 goto err_setup_rx;
1266
1267         e1000_power_up_phy(adapter);
1268
1269         adapter->mng_vlan_id = E1000_MNG_VLAN_NONE;
1270         if ((hw->mng_cookie.status &
1271                           E1000_MNG_DHCP_COOKIE_STATUS_VLAN_SUPPORT)) {
1272                 e1000_update_mng_vlan(adapter);
1273         }
1274
1275         /* before we allocate an interrupt, we must be ready to handle it.
1276          * Setting DEBUG_SHIRQ in the kernel makes it fire an interrupt
1277          * as soon as we call pci_request_irq, so we have to setup our
1278          * clean_rx handler before we do so.  */
1279         e1000_configure(adapter);
1280
1281         err = e1000_request_irq(adapter);
1282         if (err)
1283                 goto err_req_irq;
1284
1285         /* From here on the code is the same as e1000_up() */
1286         clear_bit(__E1000_DOWN, &adapter->flags);
1287
1288         napi_enable(&adapter->napi);
1289
1290         e1000_irq_enable(adapter);
1291
1292         netif_start_queue(netdev);
1293
1294         /* fire a link status change interrupt to start the watchdog */
1295         ew32(ICS, E1000_ICS_LSC);
1296
1297         return E1000_SUCCESS;
1298
1299 err_req_irq:
1300         e1000_power_down_phy(adapter);
1301         e1000_free_all_rx_resources(adapter);
1302 err_setup_rx:
1303         e1000_free_all_tx_resources(adapter);
1304 err_setup_tx:
1305         e1000_reset(adapter);
1306
1307         return err;
1308 }
1309
1310 /**
1311  * e1000_close - Disables a network interface
1312  * @netdev: network interface device structure
1313  *
1314  * Returns 0, this is not allowed to fail
1315  *
1316  * The close entry point is called when an interface is de-activated
1317  * by the OS.  The hardware is still under the drivers control, but
1318  * needs to be disabled.  A global MAC reset is issued to stop the
1319  * hardware, and all transmit and receive resources are freed.
1320  **/
1321
1322 static int e1000_close(struct net_device *netdev)
1323 {
1324         struct e1000_adapter *adapter = netdev_priv(netdev);
1325         struct e1000_hw *hw = &adapter->hw;
1326
1327         WARN_ON(test_bit(__E1000_RESETTING, &adapter->flags));
1328         e1000_down(adapter);
1329         e1000_power_down_phy(adapter);
1330         e1000_free_irq(adapter);
1331
1332         e1000_free_all_tx_resources(adapter);
1333         e1000_free_all_rx_resources(adapter);
1334
1335         /* kill manageability vlan ID if supported, but not if a vlan with
1336          * the same ID is registered on the host OS (let 8021q kill it) */
1337         if ((hw->mng_cookie.status &
1338                           E1000_MNG_DHCP_COOKIE_STATUS_VLAN_SUPPORT) &&
1339              !(adapter->vlgrp &&
1340                vlan_group_get_device(adapter->vlgrp, adapter->mng_vlan_id))) {
1341                 e1000_vlan_rx_kill_vid(netdev, adapter->mng_vlan_id);
1342         }
1343
1344         return 0;
1345 }
1346
1347 /**
1348  * e1000_check_64k_bound - check that memory doesn't cross 64kB boundary
1349  * @adapter: address of board private structure
1350  * @start: address of beginning of memory
1351  * @len: length of memory
1352  **/
1353 static bool e1000_check_64k_bound(struct e1000_adapter *adapter, void *start,
1354                                   unsigned long len)
1355 {
1356         struct e1000_hw *hw = &adapter->hw;
1357         unsigned long begin = (unsigned long)start;
1358         unsigned long end = begin + len;
1359
1360         /* First rev 82545 and 82546 need to not allow any memory
1361          * write location to cross 64k boundary due to errata 23 */
1362         if (hw->mac_type == e1000_82545 ||
1363             hw->mac_type == e1000_82546) {
1364                 return ((begin ^ (end - 1)) >> 16) != 0 ? false : true;
1365         }
1366
1367         return true;
1368 }
1369
1370 /**
1371  * e1000_setup_tx_resources - allocate Tx resources (Descriptors)
1372  * @adapter: board private structure
1373  * @txdr:    tx descriptor ring (for a specific queue) to setup
1374  *
1375  * Return 0 on success, negative on failure
1376  **/
1377
1378 static int e1000_setup_tx_resources(struct e1000_adapter *adapter,
1379                                     struct e1000_tx_ring *txdr)
1380 {
1381         struct pci_dev *pdev = adapter->pdev;
1382         int size;
1383
1384         size = sizeof(struct e1000_buffer) * txdr->count;
1385         txdr->buffer_info = vmalloc(size);
1386         if (!txdr->buffer_info) {
1387                 DPRINTK(PROBE, ERR,
1388                 "Unable to allocate memory for the transmit descriptor ring\n");
1389                 return -ENOMEM;
1390         }
1391         memset(txdr->buffer_info, 0, size);
1392
1393         /* round up to nearest 4K */
1394
1395         txdr->size = txdr->count * sizeof(struct e1000_tx_desc);
1396         txdr->size = ALIGN(txdr->size, 4096);
1397
1398         txdr->desc = pci_alloc_consistent(pdev, txdr->size, &txdr->dma);
1399         if (!txdr->desc) {
1400 setup_tx_desc_die:
1401                 vfree(txdr->buffer_info);
1402                 DPRINTK(PROBE, ERR,
1403                 "Unable to allocate memory for the transmit descriptor ring\n");
1404                 return -ENOMEM;
1405         }
1406
1407         /* Fix for errata 23, can't cross 64kB boundary */
1408         if (!e1000_check_64k_bound(adapter, txdr->desc, txdr->size)) {
1409                 void *olddesc = txdr->desc;
1410                 dma_addr_t olddma = txdr->dma;
1411                 DPRINTK(TX_ERR, ERR, "txdr align check failed: %u bytes "
1412                                      "at %p\n", txdr->size, txdr->desc);
1413                 /* Try again, without freeing the previous */
1414                 txdr->desc = pci_alloc_consistent(pdev, txdr->size, &txdr->dma);
1415                 /* Failed allocation, critical failure */
1416                 if (!txdr->desc) {
1417                         pci_free_consistent(pdev, txdr->size, olddesc, olddma);
1418                         goto setup_tx_desc_die;
1419                 }
1420
1421                 if (!e1000_check_64k_bound(adapter, txdr->desc, txdr->size)) {
1422                         /* give up */
1423                         pci_free_consistent(pdev, txdr->size, txdr->desc,
1424                                             txdr->dma);
1425                         pci_free_consistent(pdev, txdr->size, olddesc, olddma);
1426                         DPRINTK(PROBE, ERR,
1427                                 "Unable to allocate aligned memory "
1428                                 "for the transmit descriptor ring\n");
1429                         vfree(txdr->buffer_info);
1430                         return -ENOMEM;
1431                 } else {
1432                         /* Free old allocation, new allocation was successful */
1433                         pci_free_consistent(pdev, txdr->size, olddesc, olddma);
1434                 }
1435         }
1436         memset(txdr->desc, 0, txdr->size);
1437
1438         txdr->next_to_use = 0;
1439         txdr->next_to_clean = 0;
1440
1441         return 0;
1442 }
1443
1444 /**
1445  * e1000_setup_all_tx_resources - wrapper to allocate Tx resources
1446  *                                (Descriptors) for all queues
1447  * @adapter: board private structure
1448  *
1449  * Return 0 on success, negative on failure
1450  **/
1451
1452 int e1000_setup_all_tx_resources(struct e1000_adapter *adapter)
1453 {
1454         int i, err = 0;
1455
1456         for (i = 0; i < adapter->num_tx_queues; i++) {
1457                 err = e1000_setup_tx_resources(adapter, &adapter->tx_ring[i]);
1458                 if (err) {
1459                         DPRINTK(PROBE, ERR,
1460                                 "Allocation for Tx Queue %u failed\n", i);
1461                         for (i-- ; i >= 0; i--)
1462                                 e1000_free_tx_resources(adapter,
1463                                                         &adapter->tx_ring[i]);
1464                         break;
1465                 }
1466         }
1467
1468         return err;
1469 }
1470
1471 /**
1472  * e1000_configure_tx - Configure 8254x Transmit Unit after Reset
1473  * @adapter: board private structure
1474  *
1475  * Configure the Tx unit of the MAC after a reset.
1476  **/
1477
1478 static void e1000_configure_tx(struct e1000_adapter *adapter)
1479 {
1480         u64 tdba;
1481         struct e1000_hw *hw = &adapter->hw;
1482         u32 tdlen, tctl, tipg;
1483         u32 ipgr1, ipgr2;
1484
1485         /* Setup the HW Tx Head and Tail descriptor pointers */
1486
1487         switch (adapter->num_tx_queues) {
1488         case 1:
1489         default:
1490                 tdba = adapter->tx_ring[0].dma;
1491                 tdlen = adapter->tx_ring[0].count *
1492                         sizeof(struct e1000_tx_desc);
1493                 ew32(TDLEN, tdlen);
1494                 ew32(TDBAH, (tdba >> 32));
1495                 ew32(TDBAL, (tdba & 0x00000000ffffffffULL));
1496                 ew32(TDT, 0);
1497                 ew32(TDH, 0);
1498                 adapter->tx_ring[0].tdh = ((hw->mac_type >= e1000_82543) ? E1000_TDH : E1000_82542_TDH);
1499                 adapter->tx_ring[0].tdt = ((hw->mac_type >= e1000_82543) ? E1000_TDT : E1000_82542_TDT);
1500                 break;
1501         }
1502
1503         /* Set the default values for the Tx Inter Packet Gap timer */
1504         if ((hw->media_type == e1000_media_type_fiber ||
1505              hw->media_type == e1000_media_type_internal_serdes))
1506                 tipg = DEFAULT_82543_TIPG_IPGT_FIBER;
1507         else
1508                 tipg = DEFAULT_82543_TIPG_IPGT_COPPER;
1509
1510         switch (hw->mac_type) {
1511         case e1000_82542_rev2_0:
1512         case e1000_82542_rev2_1:
1513                 tipg = DEFAULT_82542_TIPG_IPGT;
1514                 ipgr1 = DEFAULT_82542_TIPG_IPGR1;
1515                 ipgr2 = DEFAULT_82542_TIPG_IPGR2;
1516                 break;
1517         default:
1518                 ipgr1 = DEFAULT_82543_TIPG_IPGR1;
1519                 ipgr2 = DEFAULT_82543_TIPG_IPGR2;
1520                 break;
1521         }
1522         tipg |= ipgr1 << E1000_TIPG_IPGR1_SHIFT;
1523         tipg |= ipgr2 << E1000_TIPG_IPGR2_SHIFT;
1524         ew32(TIPG, tipg);
1525
1526         /* Set the Tx Interrupt Delay register */
1527
1528         ew32(TIDV, adapter->tx_int_delay);
1529         if (hw->mac_type >= e1000_82540)
1530                 ew32(TADV, adapter->tx_abs_int_delay);
1531
1532         /* Program the Transmit Control Register */
1533
1534         tctl = er32(TCTL);
1535         tctl &= ~E1000_TCTL_CT;
1536         tctl |= E1000_TCTL_PSP | E1000_TCTL_RTLC |
1537                 (E1000_COLLISION_THRESHOLD << E1000_CT_SHIFT);
1538
1539         e1000_config_collision_dist(hw);
1540
1541         /* Setup Transmit Descriptor Settings for eop descriptor */
1542         adapter->txd_cmd = E1000_TXD_CMD_EOP | E1000_TXD_CMD_IFCS;
1543
1544         /* only set IDE if we are delaying interrupts using the timers */
1545         if (adapter->tx_int_delay)
1546                 adapter->txd_cmd |= E1000_TXD_CMD_IDE;
1547
1548         if (hw->mac_type < e1000_82543)
1549                 adapter->txd_cmd |= E1000_TXD_CMD_RPS;
1550         else
1551                 adapter->txd_cmd |= E1000_TXD_CMD_RS;
1552
1553         /* Cache if we're 82544 running in PCI-X because we'll
1554          * need this to apply a workaround later in the send path. */
1555         if (hw->mac_type == e1000_82544 &&
1556             hw->bus_type == e1000_bus_type_pcix)
1557                 adapter->pcix_82544 = 1;
1558
1559         ew32(TCTL, tctl);
1560
1561 }
1562
1563 /**
1564  * e1000_setup_rx_resources - allocate Rx resources (Descriptors)
1565  * @adapter: board private structure
1566  * @rxdr:    rx descriptor ring (for a specific queue) to setup
1567  *
1568  * Returns 0 on success, negative on failure
1569  **/
1570
1571 static int e1000_setup_rx_resources(struct e1000_adapter *adapter,
1572                                     struct e1000_rx_ring *rxdr)
1573 {
1574         struct pci_dev *pdev = adapter->pdev;
1575         int size, desc_len;
1576
1577         size = sizeof(struct e1000_buffer) * rxdr->count;
1578         rxdr->buffer_info = vmalloc(size);
1579         if (!rxdr->buffer_info) {
1580                 DPRINTK(PROBE, ERR,
1581                 "Unable to allocate memory for the receive descriptor ring\n");
1582                 return -ENOMEM;
1583         }
1584         memset(rxdr->buffer_info, 0, size);
1585
1586         desc_len = sizeof(struct e1000_rx_desc);
1587
1588         /* Round up to nearest 4K */
1589
1590         rxdr->size = rxdr->count * desc_len;
1591         rxdr->size = ALIGN(rxdr->size, 4096);
1592
1593         rxdr->desc = pci_alloc_consistent(pdev, rxdr->size, &rxdr->dma);
1594
1595         if (!rxdr->desc) {
1596                 DPRINTK(PROBE, ERR,
1597                 "Unable to allocate memory for the receive descriptor ring\n");
1598 setup_rx_desc_die:
1599                 vfree(rxdr->buffer_info);
1600                 return -ENOMEM;
1601         }
1602
1603         /* Fix for errata 23, can't cross 64kB boundary */
1604         if (!e1000_check_64k_bound(adapter, rxdr->desc, rxdr->size)) {
1605                 void *olddesc = rxdr->desc;
1606                 dma_addr_t olddma = rxdr->dma;
1607                 DPRINTK(RX_ERR, ERR, "rxdr align check failed: %u bytes "
1608                                      "at %p\n", rxdr->size, rxdr->desc);
1609                 /* Try again, without freeing the previous */
1610                 rxdr->desc = pci_alloc_consistent(pdev, rxdr->size, &rxdr->dma);
1611                 /* Failed allocation, critical failure */
1612                 if (!rxdr->desc) {
1613                         pci_free_consistent(pdev, rxdr->size, olddesc, olddma);
1614                         DPRINTK(PROBE, ERR,
1615                                 "Unable to allocate memory "
1616                                 "for the receive descriptor ring\n");
1617                         goto setup_rx_desc_die;
1618                 }
1619
1620                 if (!e1000_check_64k_bound(adapter, rxdr->desc, rxdr->size)) {
1621                         /* give up */
1622                         pci_free_consistent(pdev, rxdr->size, rxdr->desc,
1623                                             rxdr->dma);
1624                         pci_free_consistent(pdev, rxdr->size, olddesc, olddma);
1625                         DPRINTK(PROBE, ERR,
1626                                 "Unable to allocate aligned memory "
1627                                 "for the receive descriptor ring\n");
1628                         goto setup_rx_desc_die;
1629                 } else {
1630                         /* Free old allocation, new allocation was successful */
1631                         pci_free_consistent(pdev, rxdr->size, olddesc, olddma);
1632                 }
1633         }
1634         memset(rxdr->desc, 0, rxdr->size);
1635
1636         rxdr->next_to_clean = 0;
1637         rxdr->next_to_use = 0;
1638         rxdr->rx_skb_top = NULL;
1639
1640         return 0;
1641 }
1642
1643 /**
1644  * e1000_setup_all_rx_resources - wrapper to allocate Rx resources
1645  *                                (Descriptors) for all queues
1646  * @adapter: board private structure
1647  *
1648  * Return 0 on success, negative on failure
1649  **/
1650
1651 int e1000_setup_all_rx_resources(struct e1000_adapter *adapter)
1652 {
1653         int i, err = 0;
1654
1655         for (i = 0; i < adapter->num_rx_queues; i++) {
1656                 err = e1000_setup_rx_resources(adapter, &adapter->rx_ring[i]);
1657                 if (err) {
1658                         DPRINTK(PROBE, ERR,
1659                                 "Allocation for Rx Queue %u failed\n", i);
1660                         for (i-- ; i >= 0; i--)
1661                                 e1000_free_rx_resources(adapter,
1662                                                         &adapter->rx_ring[i]);
1663                         break;
1664                 }
1665         }
1666
1667         return err;
1668 }
1669
1670 /**
1671  * e1000_setup_rctl - configure the receive control registers
1672  * @adapter: Board private structure
1673  **/
1674 static void e1000_setup_rctl(struct e1000_adapter *adapter)
1675 {
1676         struct e1000_hw *hw = &adapter->hw;
1677         u32 rctl;
1678
1679         rctl = er32(RCTL);
1680
1681         rctl &= ~(3 << E1000_RCTL_MO_SHIFT);
1682
1683         rctl |= E1000_RCTL_EN | E1000_RCTL_BAM |
1684                 E1000_RCTL_LBM_NO | E1000_RCTL_RDMTS_HALF |
1685                 (hw->mc_filter_type << E1000_RCTL_MO_SHIFT);
1686
1687         if (hw->tbi_compatibility_on == 1)
1688                 rctl |= E1000_RCTL_SBP;
1689         else
1690                 rctl &= ~E1000_RCTL_SBP;
1691
1692         if (adapter->netdev->mtu <= ETH_DATA_LEN)
1693                 rctl &= ~E1000_RCTL_LPE;
1694         else
1695                 rctl |= E1000_RCTL_LPE;
1696
1697         /* Setup buffer sizes */
1698         rctl &= ~E1000_RCTL_SZ_4096;
1699         rctl |= E1000_RCTL_BSEX;
1700         switch (adapter->rx_buffer_len) {
1701                 case E1000_RXBUFFER_2048:
1702                 default:
1703                         rctl |= E1000_RCTL_SZ_2048;
1704                         rctl &= ~E1000_RCTL_BSEX;
1705                         break;
1706                 case E1000_RXBUFFER_4096:
1707                         rctl |= E1000_RCTL_SZ_4096;
1708                         break;
1709                 case E1000_RXBUFFER_8192:
1710                         rctl |= E1000_RCTL_SZ_8192;
1711                         break;
1712                 case E1000_RXBUFFER_16384:
1713                         rctl |= E1000_RCTL_SZ_16384;
1714                         break;
1715         }
1716
1717         ew32(RCTL, rctl);
1718 }
1719
1720 /**
1721  * e1000_configure_rx - Configure 8254x Receive Unit after Reset
1722  * @adapter: board private structure
1723  *
1724  * Configure the Rx unit of the MAC after a reset.
1725  **/
1726
1727 static void e1000_configure_rx(struct e1000_adapter *adapter)
1728 {
1729         u64 rdba;
1730         struct e1000_hw *hw = &adapter->hw;
1731         u32 rdlen, rctl, rxcsum;
1732
1733         if (adapter->netdev->mtu > ETH_DATA_LEN) {
1734                 rdlen = adapter->rx_ring[0].count *
1735                         sizeof(struct e1000_rx_desc);
1736                 adapter->clean_rx = e1000_clean_jumbo_rx_irq;
1737                 adapter->alloc_rx_buf = e1000_alloc_jumbo_rx_buffers;
1738         } else {
1739                 rdlen = adapter->rx_ring[0].count *
1740                         sizeof(struct e1000_rx_desc);
1741                 adapter->clean_rx = e1000_clean_rx_irq;
1742                 adapter->alloc_rx_buf = e1000_alloc_rx_buffers;
1743         }
1744
1745         /* disable receives while setting up the descriptors */
1746         rctl = er32(RCTL);
1747         ew32(RCTL, rctl & ~E1000_RCTL_EN);
1748
1749         /* set the Receive Delay Timer Register */
1750         ew32(RDTR, adapter->rx_int_delay);
1751
1752         if (hw->mac_type >= e1000_82540) {
1753                 ew32(RADV, adapter->rx_abs_int_delay);
1754                 if (adapter->itr_setting != 0)
1755                         ew32(ITR, 1000000000 / (adapter->itr * 256));
1756         }
1757
1758         /* Setup the HW Rx Head and Tail Descriptor Pointers and
1759          * the Base and Length of the Rx Descriptor Ring */
1760         switch (adapter->num_rx_queues) {
1761         case 1:
1762         default:
1763                 rdba = adapter->rx_ring[0].dma;
1764                 ew32(RDLEN, rdlen);
1765                 ew32(RDBAH, (rdba >> 32));
1766                 ew32(RDBAL, (rdba & 0x00000000ffffffffULL));
1767                 ew32(RDT, 0);
1768                 ew32(RDH, 0);
1769                 adapter->rx_ring[0].rdh = ((hw->mac_type >= e1000_82543) ? E1000_RDH : E1000_82542_RDH);
1770                 adapter->rx_ring[0].rdt = ((hw->mac_type >= e1000_82543) ? E1000_RDT : E1000_82542_RDT);
1771                 break;
1772         }
1773
1774         /* Enable 82543 Receive Checksum Offload for TCP and UDP */
1775         if (hw->mac_type >= e1000_82543) {
1776                 rxcsum = er32(RXCSUM);
1777                 if (adapter->rx_csum)
1778                         rxcsum |= E1000_RXCSUM_TUOFL;
1779                 else
1780                         /* don't need to clear IPPCSE as it defaults to 0 */
1781                         rxcsum &= ~E1000_RXCSUM_TUOFL;
1782                 ew32(RXCSUM, rxcsum);
1783         }
1784
1785         /* Enable Receives */
1786         ew32(RCTL, rctl);
1787 }
1788
1789 /**
1790  * e1000_free_tx_resources - Free Tx Resources per Queue
1791  * @adapter: board private structure
1792  * @tx_ring: Tx descriptor ring for a specific queue
1793  *
1794  * Free all transmit software resources
1795  **/
1796
1797 static void e1000_free_tx_resources(struct e1000_adapter *adapter,
1798                                     struct e1000_tx_ring *tx_ring)
1799 {
1800         struct pci_dev *pdev = adapter->pdev;
1801
1802         e1000_clean_tx_ring(adapter, tx_ring);
1803
1804         vfree(tx_ring->buffer_info);
1805         tx_ring->buffer_info = NULL;
1806
1807         pci_free_consistent(pdev, tx_ring->size, tx_ring->desc, tx_ring->dma);
1808
1809         tx_ring->desc = NULL;
1810 }
1811
1812 /**
1813  * e1000_free_all_tx_resources - Free Tx Resources for All Queues
1814  * @adapter: board private structure
1815  *
1816  * Free all transmit software resources
1817  **/
1818
1819 void e1000_free_all_tx_resources(struct e1000_adapter *adapter)
1820 {
1821         int i;
1822
1823         for (i = 0; i < adapter->num_tx_queues; i++)
1824                 e1000_free_tx_resources(adapter, &adapter->tx_ring[i]);
1825 }
1826
1827 static void e1000_unmap_and_free_tx_resource(struct e1000_adapter *adapter,
1828                                              struct e1000_buffer *buffer_info)
1829 {
1830         if (buffer_info->dma) {
1831                 if (buffer_info->mapped_as_page)
1832                         pci_unmap_page(adapter->pdev, buffer_info->dma,
1833                                        buffer_info->length, PCI_DMA_TODEVICE);
1834                 else
1835                         pci_unmap_single(adapter->pdev, buffer_info->dma,
1836                                          buffer_info->length,
1837                                          PCI_DMA_TODEVICE);
1838                 buffer_info->dma = 0;
1839         }
1840         if (buffer_info->skb) {
1841                 dev_kfree_skb_any(buffer_info->skb);
1842                 buffer_info->skb = NULL;
1843         }
1844         buffer_info->time_stamp = 0;
1845         /* buffer_info must be completely set up in the transmit path */
1846 }
1847
1848 /**
1849  * e1000_clean_tx_ring - Free Tx Buffers
1850  * @adapter: board private structure
1851  * @tx_ring: ring to be cleaned
1852  **/
1853
1854 static void e1000_clean_tx_ring(struct e1000_adapter *adapter,
1855                                 struct e1000_tx_ring *tx_ring)
1856 {
1857         struct e1000_hw *hw = &adapter->hw;
1858         struct e1000_buffer *buffer_info;
1859         unsigned long size;
1860         unsigned int i;
1861
1862         /* Free all the Tx ring sk_buffs */
1863
1864         for (i = 0; i < tx_ring->count; i++) {
1865                 buffer_info = &tx_ring->buffer_info[i];
1866                 e1000_unmap_and_free_tx_resource(adapter, buffer_info);
1867         }
1868
1869         size = sizeof(struct e1000_buffer) * tx_ring->count;
1870         memset(tx_ring->buffer_info, 0, size);
1871
1872         /* Zero out the descriptor ring */
1873
1874         memset(tx_ring->desc, 0, tx_ring->size);
1875
1876         tx_ring->next_to_use = 0;
1877         tx_ring->next_to_clean = 0;
1878         tx_ring->last_tx_tso = 0;
1879
1880         writel(0, hw->hw_addr + tx_ring->tdh);
1881         writel(0, hw->hw_addr + tx_ring->tdt);
1882 }
1883
1884 /**
1885  * e1000_clean_all_tx_rings - Free Tx Buffers for all queues
1886  * @adapter: board private structure
1887  **/
1888
1889 static void e1000_clean_all_tx_rings(struct e1000_adapter *adapter)
1890 {
1891         int i;
1892
1893         for (i = 0; i < adapter->num_tx_queues; i++)
1894                 e1000_clean_tx_ring(adapter, &adapter->tx_ring[i]);
1895 }
1896
1897 /**
1898  * e1000_free_rx_resources - Free Rx Resources
1899  * @adapter: board private structure
1900  * @rx_ring: ring to clean the resources from
1901  *
1902  * Free all receive software resources
1903  **/
1904
1905 static void e1000_free_rx_resources(struct e1000_adapter *adapter,
1906                                     struct e1000_rx_ring *rx_ring)
1907 {
1908         struct pci_dev *pdev = adapter->pdev;
1909
1910         e1000_clean_rx_ring(adapter, rx_ring);
1911
1912         vfree(rx_ring->buffer_info);
1913         rx_ring->buffer_info = NULL;
1914
1915         pci_free_consistent(pdev, rx_ring->size, rx_ring->desc, rx_ring->dma);
1916
1917         rx_ring->desc = NULL;
1918 }
1919
1920 /**
1921  * e1000_free_all_rx_resources - Free Rx Resources for All Queues
1922  * @adapter: board private structure
1923  *
1924  * Free all receive software resources
1925  **/
1926
1927 void e1000_free_all_rx_resources(struct e1000_adapter *adapter)
1928 {
1929         int i;
1930
1931         for (i = 0; i < adapter->num_rx_queues; i++)
1932                 e1000_free_rx_resources(adapter, &adapter->rx_ring[i]);
1933 }
1934
1935 /**
1936  * e1000_clean_rx_ring - Free Rx Buffers per Queue
1937  * @adapter: board private structure
1938  * @rx_ring: ring to free buffers from
1939  **/
1940
1941 static void e1000_clean_rx_ring(struct e1000_adapter *adapter,
1942                                 struct e1000_rx_ring *rx_ring)
1943 {
1944         struct e1000_hw *hw = &adapter->hw;
1945         struct e1000_buffer *buffer_info;
1946         struct pci_dev *pdev = adapter->pdev;
1947         unsigned long size;
1948         unsigned int i;
1949
1950         /* Free all the Rx ring sk_buffs */
1951         for (i = 0; i < rx_ring->count; i++) {
1952                 buffer_info = &rx_ring->buffer_info[i];
1953                 if (buffer_info->dma &&
1954                     adapter->clean_rx == e1000_clean_rx_irq) {
1955                         pci_unmap_single(pdev, buffer_info->dma,
1956                                          buffer_info->length,
1957                                          PCI_DMA_FROMDEVICE);
1958                 } else if (buffer_info->dma &&
1959                            adapter->clean_rx == e1000_clean_jumbo_rx_irq) {
1960                         pci_unmap_page(pdev, buffer_info->dma,
1961                                        buffer_info->length,
1962                                        PCI_DMA_FROMDEVICE);
1963                 }
1964
1965                 buffer_info->dma = 0;
1966                 if (buffer_info->page) {
1967                         put_page(buffer_info->page);
1968                         buffer_info->page = NULL;
1969                 }
1970                 if (buffer_info->skb) {
1971                         dev_kfree_skb(buffer_info->skb);
1972                         buffer_info->skb = NULL;
1973                 }
1974         }
1975
1976         /* there also may be some cached data from a chained receive */
1977         if (rx_ring->rx_skb_top) {
1978                 dev_kfree_skb(rx_ring->rx_skb_top);
1979                 rx_ring->rx_skb_top = NULL;
1980         }
1981
1982         size = sizeof(struct e1000_buffer) * rx_ring->count;
1983         memset(rx_ring->buffer_info, 0, size);
1984
1985         /* Zero out the descriptor ring */
1986         memset(rx_ring->desc, 0, rx_ring->size);
1987
1988         rx_ring->next_to_clean = 0;
1989         rx_ring->next_to_use = 0;
1990
1991         writel(0, hw->hw_addr + rx_ring->rdh);
1992         writel(0, hw->hw_addr + rx_ring->rdt);
1993 }
1994
1995 /**
1996  * e1000_clean_all_rx_rings - Free Rx Buffers for all queues
1997  * @adapter: board private structure
1998  **/
1999
2000 static void e1000_clean_all_rx_rings(struct e1000_adapter *adapter)
2001 {
2002         int i;
2003
2004         for (i = 0; i < adapter->num_rx_queues; i++)
2005                 e1000_clean_rx_ring(adapter, &adapter->rx_ring[i]);
2006 }
2007
2008 /* The 82542 2.0 (revision 2) needs to have the receive unit in reset
2009  * and memory write and invalidate disabled for certain operations
2010  */
2011 static void e1000_enter_82542_rst(struct e1000_adapter *adapter)
2012 {
2013         struct e1000_hw *hw = &adapter->hw;
2014         struct net_device *netdev = adapter->netdev;
2015         u32 rctl;
2016
2017         e1000_pci_clear_mwi(hw);
2018
2019         rctl = er32(RCTL);
2020         rctl |= E1000_RCTL_RST;
2021         ew32(RCTL, rctl);
2022         E1000_WRITE_FLUSH();
2023         mdelay(5);
2024
2025         if (netif_running(netdev))
2026                 e1000_clean_all_rx_rings(adapter);
2027 }
2028
2029 static void e1000_leave_82542_rst(struct e1000_adapter *adapter)
2030 {
2031         struct e1000_hw *hw = &adapter->hw;
2032         struct net_device *netdev = adapter->netdev;
2033         u32 rctl;
2034
2035         rctl = er32(RCTL);
2036         rctl &= ~E1000_RCTL_RST;
2037         ew32(RCTL, rctl);
2038         E1000_WRITE_FLUSH();
2039         mdelay(5);
2040
2041         if (hw->pci_cmd_word & PCI_COMMAND_INVALIDATE)
2042                 e1000_pci_set_mwi(hw);
2043
2044         if (netif_running(netdev)) {
2045                 /* No need to loop, because 82542 supports only 1 queue */
2046                 struct e1000_rx_ring *ring = &adapter->rx_ring[0];
2047                 e1000_configure_rx(adapter);
2048                 adapter->alloc_rx_buf(adapter, ring, E1000_DESC_UNUSED(ring));
2049         }
2050 }
2051
2052 /**
2053  * e1000_set_mac - Change the Ethernet Address of the NIC
2054  * @netdev: network interface device structure
2055  * @p: pointer to an address structure
2056  *
2057  * Returns 0 on success, negative on failure
2058  **/
2059
2060 static int e1000_set_mac(struct net_device *netdev, void *p)
2061 {
2062         struct e1000_adapter *adapter = netdev_priv(netdev);
2063         struct e1000_hw *hw = &adapter->hw;
2064         struct sockaddr *addr = p;
2065
2066         if (!is_valid_ether_addr(addr->sa_data))
2067                 return -EADDRNOTAVAIL;
2068
2069         /* 82542 2.0 needs to be in reset to write receive address registers */
2070
2071         if (hw->mac_type == e1000_82542_rev2_0)
2072                 e1000_enter_82542_rst(adapter);
2073
2074         memcpy(netdev->dev_addr, addr->sa_data, netdev->addr_len);
2075         memcpy(hw->mac_addr, addr->sa_data, netdev->addr_len);
2076
2077         e1000_rar_set(hw, hw->mac_addr, 0);
2078
2079         if (hw->mac_type == e1000_82542_rev2_0)
2080                 e1000_leave_82542_rst(adapter);
2081
2082         return 0;
2083 }
2084
2085 /**
2086  * e1000_set_rx_mode - Secondary Unicast, Multicast and Promiscuous mode set
2087  * @netdev: network interface device structure
2088  *
2089  * The set_rx_mode entry point is called whenever the unicast or multicast
2090  * address lists or the network interface flags are updated. This routine is
2091  * responsible for configuring the hardware for proper unicast, multicast,
2092  * promiscuous mode, and all-multi behavior.
2093  **/
2094
2095 static void e1000_set_rx_mode(struct net_device *netdev)
2096 {
2097         struct e1000_adapter *adapter = netdev_priv(netdev);
2098         struct e1000_hw *hw = &adapter->hw;
2099         struct netdev_hw_addr *ha;
2100         bool use_uc = false;
2101         struct dev_addr_list *mc_ptr;
2102         u32 rctl;
2103         u32 hash_value;
2104         int i, rar_entries = E1000_RAR_ENTRIES;
2105         int mta_reg_count = E1000_NUM_MTA_REGISTERS;
2106         u32 *mcarray = kcalloc(mta_reg_count, sizeof(u32), GFP_ATOMIC);
2107
2108         if (!mcarray) {
2109                 DPRINTK(PROBE, ERR, "memory allocation failed\n");
2110                 return;
2111         }
2112
2113         /* Check for Promiscuous and All Multicast modes */
2114
2115         rctl = er32(RCTL);
2116
2117         if (netdev->flags & IFF_PROMISC) {
2118                 rctl |= (E1000_RCTL_UPE | E1000_RCTL_MPE);
2119                 rctl &= ~E1000_RCTL_VFE;
2120         } else {
2121                 if (netdev->flags & IFF_ALLMULTI)
2122                         rctl |= E1000_RCTL_MPE;
2123                 else
2124                         rctl &= ~E1000_RCTL_MPE;
2125                 /* Enable VLAN filter if there is a VLAN */
2126                 if (adapter->vlgrp)
2127                         rctl |= E1000_RCTL_VFE;
2128         }
2129
2130         if (netdev_uc_count(netdev) > rar_entries - 1) {
2131                 rctl |= E1000_RCTL_UPE;
2132         } else if (!(netdev->flags & IFF_PROMISC)) {
2133                 rctl &= ~E1000_RCTL_UPE;
2134                 use_uc = true;
2135         }
2136
2137         ew32(RCTL, rctl);
2138
2139         /* 82542 2.0 needs to be in reset to write receive address registers */
2140
2141         if (hw->mac_type == e1000_82542_rev2_0)
2142                 e1000_enter_82542_rst(adapter);
2143
2144         /* load the first 14 addresses into the exact filters 1-14. Unicast
2145          * addresses take precedence to avoid disabling unicast filtering
2146          * when possible.
2147          *
2148          * RAR 0 is used for the station MAC adddress
2149          * if there are not 14 addresses, go ahead and clear the filters
2150          */
2151         i = 1;
2152         if (use_uc)
2153                 netdev_for_each_uc_addr(ha, netdev) {
2154                         if (i == rar_entries)
2155                                 break;
2156                         e1000_rar_set(hw, ha->addr, i++);
2157                 }
2158
2159         WARN_ON(i == rar_entries);
2160
2161         netdev_for_each_mc_addr(mc_ptr, netdev) {
2162                 if (i == rar_entries) {
2163                         /* load any remaining addresses into the hash table */
2164                         u32 hash_reg, hash_bit, mta;
2165                         hash_value = e1000_hash_mc_addr(hw, mc_ptr->da_addr);
2166                         hash_reg = (hash_value >> 5) & 0x7F;
2167                         hash_bit = hash_value & 0x1F;
2168                         mta = (1 << hash_bit);
2169                         mcarray[hash_reg] |= mta;
2170                 } else {
2171                         e1000_rar_set(hw, mc_ptr->da_addr, i++);
2172                 }
2173         }
2174
2175         for (; i < rar_entries; i++) {
2176                 E1000_WRITE_REG_ARRAY(hw, RA, i << 1, 0);
2177                 E1000_WRITE_FLUSH();
2178                 E1000_WRITE_REG_ARRAY(hw, RA, (i << 1) + 1, 0);
2179                 E1000_WRITE_FLUSH();
2180         }
2181
2182         /* write the hash table completely, write from bottom to avoid
2183          * both stupid write combining chipsets, and flushing each write */
2184         for (i = mta_reg_count - 1; i >= 0 ; i--) {
2185                 /*
2186                  * If we are on an 82544 has an errata where writing odd
2187                  * offsets overwrites the previous even offset, but writing
2188                  * backwards over the range solves the issue by always
2189                  * writing the odd offset first
2190                  */
2191                 E1000_WRITE_REG_ARRAY(hw, MTA, i, mcarray[i]);
2192         }
2193         E1000_WRITE_FLUSH();
2194
2195         if (hw->mac_type == e1000_82542_rev2_0)
2196                 e1000_leave_82542_rst(adapter);
2197
2198         kfree(mcarray);
2199 }
2200
2201 /* Need to wait a few seconds after link up to get diagnostic information from
2202  * the phy */
2203
2204 static void e1000_update_phy_info(unsigned long data)
2205 {
2206         struct e1000_adapter *adapter = (struct e1000_adapter *)data;
2207         struct e1000_hw *hw = &adapter->hw;
2208         e1000_phy_get_info(hw, &adapter->phy_info);
2209 }
2210
2211 /**
2212  * e1000_82547_tx_fifo_stall - Timer Call-back
2213  * @data: pointer to adapter cast into an unsigned long
2214  **/
2215
2216 static void e1000_82547_tx_fifo_stall(unsigned long data)
2217 {
2218         struct e1000_adapter *adapter = (struct e1000_adapter *)data;
2219         struct e1000_hw *hw = &adapter->hw;
2220         struct net_device *netdev = adapter->netdev;
2221         u32 tctl;
2222
2223         if (atomic_read(&adapter->tx_fifo_stall)) {
2224                 if ((er32(TDT) == er32(TDH)) &&
2225                    (er32(TDFT) == er32(TDFH)) &&
2226                    (er32(TDFTS) == er32(TDFHS))) {
2227                         tctl = er32(TCTL);
2228                         ew32(TCTL, tctl & ~E1000_TCTL_EN);
2229                         ew32(TDFT, adapter->tx_head_addr);
2230                         ew32(TDFH, adapter->tx_head_addr);
2231                         ew32(TDFTS, adapter->tx_head_addr);
2232                         ew32(TDFHS, adapter->tx_head_addr);
2233                         ew32(TCTL, tctl);
2234                         E1000_WRITE_FLUSH();
2235
2236                         adapter->tx_fifo_head = 0;
2237                         atomic_set(&adapter->tx_fifo_stall, 0);
2238                         netif_wake_queue(netdev);
2239                 } else if (!test_bit(__E1000_DOWN, &adapter->flags)) {
2240                         mod_timer(&adapter->tx_fifo_stall_timer, jiffies + 1);
2241                 }
2242         }
2243 }
2244
2245 bool e1000_has_link(struct e1000_adapter *adapter)
2246 {
2247         struct e1000_hw *hw = &adapter->hw;
2248         bool link_active = false;
2249
2250         /* get_link_status is set on LSC (link status) interrupt or
2251          * rx sequence error interrupt.  get_link_status will stay
2252          * false until the e1000_check_for_link establishes link
2253          * for copper adapters ONLY
2254          */
2255         switch (hw->media_type) {
2256         case e1000_media_type_copper:
2257                 if (hw->get_link_status) {
2258                         e1000_check_for_link(hw);
2259                         link_active = !hw->get_link_status;
2260                 } else {
2261                         link_active = true;
2262                 }
2263                 break;
2264         case e1000_media_type_fiber:
2265                 e1000_check_for_link(hw);
2266                 link_active = !!(er32(STATUS) & E1000_STATUS_LU);
2267                 break;
2268         case e1000_media_type_internal_serdes:
2269                 e1000_check_for_link(hw);
2270                 link_active = hw->serdes_has_link;
2271                 break;
2272         default:
2273                 break;
2274         }
2275
2276         return link_active;
2277 }
2278
2279 /**
2280  * e1000_watchdog - Timer Call-back
2281  * @data: pointer to adapter cast into an unsigned long
2282  **/
2283 static void e1000_watchdog(unsigned long data)
2284 {
2285         struct e1000_adapter *adapter = (struct e1000_adapter *)data;
2286         struct e1000_hw *hw = &adapter->hw;
2287         struct net_device *netdev = adapter->netdev;
2288         struct e1000_tx_ring *txdr = adapter->tx_ring;
2289         u32 link, tctl;
2290
2291         link = e1000_has_link(adapter);
2292         if ((netif_carrier_ok(netdev)) && link)
2293                 goto link_up;
2294
2295         if (link) {
2296                 if (!netif_carrier_ok(netdev)) {
2297                         u32 ctrl;
2298                         bool txb2b = true;
2299                         /* update snapshot of PHY registers on LSC */
2300                         e1000_get_speed_and_duplex(hw,
2301                                                    &adapter->link_speed,
2302                                                    &adapter->link_duplex);
2303
2304                         ctrl = er32(CTRL);
2305                         printk(KERN_INFO "e1000: %s NIC Link is Up %d Mbps %s, "
2306                                "Flow Control: %s\n",
2307                                netdev->name,
2308                                adapter->link_speed,
2309                                adapter->link_duplex == FULL_DUPLEX ?
2310                                 "Full Duplex" : "Half Duplex",
2311                                 ((ctrl & E1000_CTRL_TFCE) && (ctrl &
2312                                 E1000_CTRL_RFCE)) ? "RX/TX" : ((ctrl &
2313                                 E1000_CTRL_RFCE) ? "RX" : ((ctrl &
2314                                 E1000_CTRL_TFCE) ? "TX" : "None" )));
2315
2316                         /* adjust timeout factor according to speed/duplex */
2317                         adapter->tx_timeout_factor = 1;
2318                         switch (adapter->link_speed) {
2319                         case SPEED_10:
2320                                 txb2b = false;
2321                                 adapter->tx_timeout_factor = 16;
2322                                 break;
2323                         case SPEED_100:
2324                                 txb2b = false;
2325                                 /* maybe add some timeout factor ? */
2326                                 break;
2327                         }
2328
2329                         /* enable transmits in the hardware */
2330                         tctl = er32(TCTL);
2331                         tctl |= E1000_TCTL_EN;
2332                         ew32(TCTL, tctl);
2333
2334                         netif_carrier_on(netdev);
2335                         if (!test_bit(__E1000_DOWN, &adapter->flags))
2336                                 mod_timer(&adapter->phy_info_timer,
2337                                           round_jiffies(jiffies + 2 * HZ));
2338                         adapter->smartspeed = 0;
2339                 }
2340         } else {
2341                 if (netif_carrier_ok(netdev)) {
2342                         adapter->link_speed = 0;
2343                         adapter->link_duplex = 0;
2344                         printk(KERN_INFO "e1000: %s NIC Link is Down\n",
2345                                netdev->name);
2346                         netif_carrier_off(netdev);
2347
2348                         if (!test_bit(__E1000_DOWN, &adapter->flags))
2349                                 mod_timer(&adapter->phy_info_timer,
2350                                           round_jiffies(jiffies + 2 * HZ));
2351                 }
2352
2353                 e1000_smartspeed(adapter);
2354         }
2355
2356 link_up:
2357         e1000_update_stats(adapter);
2358
2359         hw->tx_packet_delta = adapter->stats.tpt - adapter->tpt_old;
2360         adapter->tpt_old = adapter->stats.tpt;
2361         hw->collision_delta = adapter->stats.colc - adapter->colc_old;
2362         adapter->colc_old = adapter->stats.colc;
2363
2364         adapter->gorcl = adapter->stats.gorcl - adapter->gorcl_old;
2365         adapter->gorcl_old = adapter->stats.gorcl;
2366         adapter->gotcl = adapter->stats.gotcl - adapter->gotcl_old;
2367         adapter->gotcl_old = adapter->stats.gotcl;
2368
2369         e1000_update_adaptive(hw);
2370
2371         if (!netif_carrier_ok(netdev)) {
2372                 if (E1000_DESC_UNUSED(txdr) + 1 < txdr->count) {
2373                         /* We've lost link, so the controller stops DMA,
2374                          * but we've got queued Tx work that's never going
2375                          * to get done, so reset controller to flush Tx.
2376                          * (Do the reset outside of interrupt context). */
2377                         adapter->tx_timeout_count++;
2378                         schedule_work(&adapter->reset_task);
2379                         /* return immediately since reset is imminent */
2380                         return;
2381                 }
2382         }
2383
2384         /* Cause software interrupt to ensure rx ring is cleaned */
2385         ew32(ICS, E1000_ICS_RXDMT0);
2386
2387         /* Force detection of hung controller every watchdog period */
2388         adapter->detect_tx_hung = true;
2389
2390         /* Reset the timer */
2391         if (!test_bit(__E1000_DOWN, &adapter->flags))
2392                 mod_timer(&adapter->watchdog_timer,
2393                           round_jiffies(jiffies + 2 * HZ));
2394 }
2395
2396 enum latency_range {
2397         lowest_latency = 0,
2398         low_latency = 1,
2399         bulk_latency = 2,
2400         latency_invalid = 255
2401 };
2402
2403 /**
2404  * e1000_update_itr - update the dynamic ITR value based on statistics
2405  * @adapter: pointer to adapter
2406  * @itr_setting: current adapter->itr
2407  * @packets: the number of packets during this measurement interval
2408  * @bytes: the number of bytes during this measurement interval
2409  *
2410  *      Stores a new ITR value based on packets and byte
2411  *      counts during the last interrupt.  The advantage of per interrupt
2412  *      computation is faster updates and more accurate ITR for the current
2413  *      traffic pattern.  Constants in this function were computed
2414  *      based on theoretical maximum wire speed and thresholds were set based
2415  *      on testing data as well as attempting to minimize response time
2416  *      while increasing bulk throughput.
2417  *      this functionality is controlled by the InterruptThrottleRate module
2418  *      parameter (see e1000_param.c)
2419  **/
2420 static unsigned int e1000_update_itr(struct e1000_adapter *adapter,
2421                                      u16 itr_setting, int packets, int bytes)
2422 {
2423         unsigned int retval = itr_setting;
2424         struct e1000_hw *hw = &adapter->hw;
2425
2426         if (unlikely(hw->mac_type < e1000_82540))
2427                 goto update_itr_done;
2428
2429         if (packets == 0)
2430                 goto update_itr_done;
2431
2432         switch (itr_setting) {
2433         case lowest_latency:
2434                 /* jumbo frames get bulk treatment*/
2435                 if (bytes/packets > 8000)
2436                         retval = bulk_latency;
2437                 else if ((packets < 5) && (bytes > 512))
2438                         retval = low_latency;
2439                 break;
2440         case low_latency:  /* 50 usec aka 20000 ints/s */
2441                 if (bytes > 10000) {
2442                         /* jumbo frames need bulk latency setting */
2443                         if (bytes/packets > 8000)
2444                                 retval = bulk_latency;
2445                         else if ((packets < 10) || ((bytes/packets) > 1200))
2446                                 retval = bulk_latency;
2447                         else if ((packets > 35))
2448                                 retval = lowest_latency;
2449                 } else if (bytes/packets > 2000)
2450                         retval = bulk_latency;
2451                 else if (packets <= 2 && bytes < 512)
2452                         retval = lowest_latency;
2453                 break;
2454         case bulk_latency: /* 250 usec aka 4000 ints/s */
2455                 if (bytes > 25000) {
2456                         if (packets > 35)
2457                                 retval = low_latency;
2458                 } else if (bytes < 6000) {
2459                         retval = low_latency;
2460                 }
2461                 break;
2462         }
2463
2464 update_itr_done:
2465         return retval;
2466 }
2467
2468 static void e1000_set_itr(struct e1000_adapter *adapter)
2469 {
2470         struct e1000_hw *hw = &adapter->hw;
2471         u16 current_itr;
2472         u32 new_itr = adapter->itr;
2473
2474         if (unlikely(hw->mac_type < e1000_82540))
2475                 return;
2476
2477         /* for non-gigabit speeds, just fix the interrupt rate at 4000 */
2478         if (unlikely(adapter->link_speed != SPEED_1000)) {
2479                 current_itr = 0;
2480                 new_itr = 4000;
2481                 goto set_itr_now;
2482         }
2483
2484         adapter->tx_itr = e1000_update_itr(adapter,
2485                                     adapter->tx_itr,
2486                                     adapter->total_tx_packets,
2487                                     adapter->total_tx_bytes);
2488         /* conservative mode (itr 3) eliminates the lowest_latency setting */
2489         if (adapter->itr_setting == 3 && adapter->tx_itr == lowest_latency)
2490                 adapter->tx_itr = low_latency;
2491
2492         adapter->rx_itr = e1000_update_itr(adapter,
2493                                     adapter->rx_itr,
2494                                     adapter->total_rx_packets,
2495                                     adapter->total_rx_bytes);
2496         /* conservative mode (itr 3) eliminates the lowest_latency setting */
2497         if (adapter->itr_setting == 3 && adapter->rx_itr == lowest_latency)
2498                 adapter->rx_itr = low_latency;
2499
2500         current_itr = max(adapter->rx_itr, adapter->tx_itr);
2501
2502         switch (current_itr) {
2503         /* counts and packets in update_itr are dependent on these numbers */
2504         case lowest_latency:
2505                 new_itr = 70000;
2506                 break;
2507         case low_latency:
2508                 new_itr = 20000; /* aka hwitr = ~200 */
2509                 break;
2510         case bulk_latency:
2511                 new_itr = 4000;
2512                 break;
2513         default:
2514                 break;
2515         }
2516
2517 set_itr_now:
2518         if (new_itr != adapter->itr) {
2519                 /* this attempts to bias the interrupt rate towards Bulk
2520                  * by adding intermediate steps when interrupt rate is
2521                  * increasing */
2522                 new_itr = new_itr > adapter->itr ?
2523                              min(adapter->itr + (new_itr >> 2), new_itr) :
2524                              new_itr;
2525                 adapter->itr = new_itr;
2526                 ew32(ITR, 1000000000 / (new_itr * 256));
2527         }
2528
2529         return;
2530 }
2531
2532 #define E1000_TX_FLAGS_CSUM             0x00000001
2533 #define E1000_TX_FLAGS_VLAN             0x00000002
2534 #define E1000_TX_FLAGS_TSO              0x00000004
2535 #define E1000_TX_FLAGS_IPV4             0x00000008
2536 #define E1000_TX_FLAGS_VLAN_MASK        0xffff0000
2537 #define E1000_TX_FLAGS_VLAN_SHIFT       16
2538
2539 static int e1000_tso(struct e1000_adapter *adapter,
2540                      struct e1000_tx_ring *tx_ring, struct sk_buff *skb)
2541 {
2542         struct e1000_context_desc *context_desc;
2543         struct e1000_buffer *buffer_info;
2544         unsigned int i;
2545         u32 cmd_length = 0;
2546         u16 ipcse = 0, tucse, mss;
2547         u8 ipcss, ipcso, tucss, tucso, hdr_len;
2548         int err;
2549
2550         if (skb_is_gso(skb)) {
2551                 if (skb_header_cloned(skb)) {
2552                         err = pskb_expand_head(skb, 0, 0, GFP_ATOMIC);
2553                         if (err)
2554                                 return err;
2555                 }
2556
2557                 hdr_len = skb_transport_offset(skb) + tcp_hdrlen(skb);
2558                 mss = skb_shinfo(skb)->gso_size;
2559                 if (skb->protocol == htons(ETH_P_IP)) {
2560                         struct iphdr *iph = ip_hdr(skb);
2561                         iph->tot_len = 0;
2562                         iph->check = 0;
2563                         tcp_hdr(skb)->check = ~csum_tcpudp_magic(iph->saddr,
2564                                                                  iph->daddr, 0,
2565                                                                  IPPROTO_TCP,
2566                                                                  0);
2567                         cmd_length = E1000_TXD_CMD_IP;
2568                         ipcse = skb_transport_offset(skb) - 1;
2569                 } else if (skb->protocol == htons(ETH_P_IPV6)) {
2570                         ipv6_hdr(skb)->payload_len = 0;
2571                         tcp_hdr(skb)->check =
2572                                 ~csum_ipv6_magic(&ipv6_hdr(skb)->saddr,
2573                                                  &ipv6_hdr(skb)->daddr,
2574                                                  0, IPPROTO_TCP, 0);
2575                         ipcse = 0;
2576                 }
2577                 ipcss = skb_network_offset(skb);
2578                 ipcso = (void *)&(ip_hdr(skb)->check) - (void *)skb->data;
2579                 tucss = skb_transport_offset(skb);
2580                 tucso = (void *)&(tcp_hdr(skb)->check) - (void *)skb->data;
2581                 tucse = 0;
2582
2583                 cmd_length |= (E1000_TXD_CMD_DEXT | E1000_TXD_CMD_TSE |
2584                                E1000_TXD_CMD_TCP | (skb->len - (hdr_len)));
2585
2586                 i = tx_ring->next_to_use;
2587                 context_desc = E1000_CONTEXT_DESC(*tx_ring, i);
2588                 buffer_info = &tx_ring->buffer_info[i];
2589
2590                 context_desc->lower_setup.ip_fields.ipcss  = ipcss;
2591                 context_desc->lower_setup.ip_fields.ipcso  = ipcso;
2592                 context_desc->lower_setup.ip_fields.ipcse  = cpu_to_le16(ipcse);
2593                 context_desc->upper_setup.tcp_fields.tucss = tucss;
2594                 context_desc->upper_setup.tcp_fields.tucso = tucso;
2595                 context_desc->upper_setup.tcp_fields.tucse = cpu_to_le16(tucse);
2596                 context_desc->tcp_seg_setup.fields.mss     = cpu_to_le16(mss);
2597                 context_desc->tcp_seg_setup.fields.hdr_len = hdr_len;
2598                 context_desc->cmd_and_length = cpu_to_le32(cmd_length);
2599
2600                 buffer_info->time_stamp = jiffies;
2601                 buffer_info->next_to_watch = i;
2602
2603                 if (++i == tx_ring->count) i = 0;
2604                 tx_ring->next_to_use = i;
2605
2606                 return true;
2607         }
2608         return false;
2609 }
2610
2611 static bool e1000_tx_csum(struct e1000_adapter *adapter,
2612                           struct e1000_tx_ring *tx_ring, struct sk_buff *skb)
2613 {
2614         struct e1000_context_desc *context_desc;
2615         struct e1000_buffer *buffer_info;
2616         unsigned int i;
2617         u8 css;
2618         u32 cmd_len = E1000_TXD_CMD_DEXT;
2619
2620         if (skb->ip_summed != CHECKSUM_PARTIAL)
2621                 return false;
2622
2623         switch (skb->protocol) {
2624         case cpu_to_be16(ETH_P_IP):
2625                 if (ip_hdr(skb)->protocol == IPPROTO_TCP)
2626                         cmd_len |= E1000_TXD_CMD_TCP;
2627                 break;
2628         case cpu_to_be16(ETH_P_IPV6):
2629                 /* XXX not handling all IPV6 headers */
2630                 if (ipv6_hdr(skb)->nexthdr == IPPROTO_TCP)
2631                         cmd_len |= E1000_TXD_CMD_TCP;
2632                 break;
2633         default:
2634                 if (unlikely(net_ratelimit()))
2635                         DPRINTK(DRV, WARNING,
2636                                 "checksum_partial proto=%x!\n", skb->protocol);
2637                 break;
2638         }
2639
2640         css = skb_transport_offset(skb);
2641
2642         i = tx_ring->next_to_use;
2643         buffer_info = &tx_ring->buffer_info[i];
2644         context_desc = E1000_CONTEXT_DESC(*tx_ring, i);
2645
2646         context_desc->lower_setup.ip_config = 0;
2647         context_desc->upper_setup.tcp_fields.tucss = css;
2648         context_desc->upper_setup.tcp_fields.tucso =
2649                 css + skb->csum_offset;
2650         context_desc->upper_setup.tcp_fields.tucse = 0;
2651         context_desc->tcp_seg_setup.data = 0;
2652         context_desc->cmd_and_length = cpu_to_le32(cmd_len);
2653
2654         buffer_info->time_stamp = jiffies;
2655         buffer_info->next_to_watch = i;
2656
2657         if (unlikely(++i == tx_ring->count)) i = 0;
2658         tx_ring->next_to_use = i;
2659
2660         return true;
2661 }
2662
2663 #define E1000_MAX_TXD_PWR       12
2664 #define E1000_MAX_DATA_PER_TXD  (1<<E1000_MAX_TXD_PWR)
2665
2666 static int e1000_tx_map(struct e1000_adapter *adapter,
2667                         struct e1000_tx_ring *tx_ring,
2668                         struct sk_buff *skb, unsigned int first,
2669                         unsigned int max_per_txd, unsigned int nr_frags,
2670                         unsigned int mss)
2671 {
2672         struct e1000_hw *hw = &adapter->hw;
2673         struct pci_dev *pdev = adapter->pdev;
2674         struct e1000_buffer *buffer_info;
2675         unsigned int len = skb_headlen(skb);
2676         unsigned int offset = 0, size, count = 0, i;
2677         unsigned int f;
2678
2679         i = tx_ring->next_to_use;
2680
2681         while (len) {
2682                 buffer_info = &tx_ring->buffer_info[i];
2683                 size = min(len, max_per_txd);
2684                 /* Workaround for Controller erratum --
2685                  * descriptor for non-tso packet in a linear SKB that follows a
2686                  * tso gets written back prematurely before the data is fully
2687                  * DMA'd to the controller */
2688                 if (!skb->data_len && tx_ring->last_tx_tso &&
2689                     !skb_is_gso(skb)) {
2690                         tx_ring->last_tx_tso = 0;
2691                         size -= 4;
2692                 }
2693
2694                 /* Workaround for premature desc write-backs
2695                  * in TSO mode.  Append 4-byte sentinel desc */
2696                 if (unlikely(mss && !nr_frags && size == len && size > 8))
2697                         size -= 4;
2698                 /* work-around for errata 10 and it applies
2699                  * to all controllers in PCI-X mode
2700                  * The fix is to make sure that the first descriptor of a
2701                  * packet is smaller than 2048 - 16 - 16 (or 2016) bytes
2702                  */
2703                 if (unlikely((hw->bus_type == e1000_bus_type_pcix) &&
2704                                 (size > 2015) && count == 0))
2705                         size = 2015;
2706
2707                 /* Workaround for potential 82544 hang in PCI-X.  Avoid
2708                  * terminating buffers within evenly-aligned dwords. */
2709                 if (unlikely(adapter->pcix_82544 &&
2710                    !((unsigned long)(skb->data + offset + size - 1) & 4) &&
2711                    size > 4))
2712                         size -= 4;
2713
2714                 buffer_info->length = size;
2715                 /* set time_stamp *before* dma to help avoid a possible race */
2716                 buffer_info->time_stamp = jiffies;
2717                 buffer_info->mapped_as_page = false;
2718                 buffer_info->dma = pci_map_single(pdev, skb->data + offset,
2719                                                   size, PCI_DMA_TODEVICE);
2720                 if (pci_dma_mapping_error(pdev, buffer_info->dma))
2721                         goto dma_error;
2722                 buffer_info->next_to_watch = i;
2723
2724                 len -= size;
2725                 offset += size;
2726                 count++;
2727                 if (len) {
2728                         i++;
2729                         if (unlikely(i == tx_ring->count))
2730                                 i = 0;
2731                 }
2732         }
2733
2734         for (f = 0; f < nr_frags; f++) {
2735                 struct skb_frag_struct *frag;
2736
2737                 frag = &skb_shinfo(skb)->frags[f];
2738                 len = frag->size;
2739                 offset = frag->page_offset;
2740
2741                 while (len) {
2742                         i++;
2743                         if (unlikely(i == tx_ring->count))
2744                                 i = 0;
2745
2746                         buffer_info = &tx_ring->buffer_info[i];
2747                         size = min(len, max_per_txd);
2748                         /* Workaround for premature desc write-backs
2749                          * in TSO mode.  Append 4-byte sentinel desc */
2750                         if (unlikely(mss && f == (nr_frags-1) && size == len && size > 8))
2751                                 size -= 4;
2752                         /* Workaround for potential 82544 hang in PCI-X.
2753                          * Avoid terminating buffers within evenly-aligned
2754                          * dwords. */
2755                         if (unlikely(adapter->pcix_82544 &&
2756                             !((unsigned long)(page_to_phys(frag->page) + offset
2757                                               + size - 1) & 4) &&
2758                             size > 4))
2759                                 size -= 4;
2760
2761                         buffer_info->length = size;
2762                         buffer_info->time_stamp = jiffies;
2763                         buffer_info->mapped_as_page = true;
2764                         buffer_info->dma = pci_map_page(pdev, frag->page,
2765                                                         offset, size,
2766                                                         PCI_DMA_TODEVICE);
2767                         if (pci_dma_mapping_error(pdev, buffer_info->dma))
2768                                 goto dma_error;
2769                         buffer_info->next_to_watch = i;
2770
2771                         len -= size;
2772                         offset += size;
2773                         count++;
2774                 }
2775         }
2776
2777         tx_ring->buffer_info[i].skb = skb;
2778         tx_ring->buffer_info[first].next_to_watch = i;
2779
2780         return count;
2781
2782 dma_error:
2783         dev_err(&pdev->dev, "TX DMA map failed\n");
2784         buffer_info->dma = 0;
2785         if (count)
2786                 count--;
2787
2788         while (count--) {
2789                 if (i==0)
2790                         i += tx_ring->count;
2791                 i--;
2792                 buffer_info = &tx_ring->buffer_info[i];
2793                 e1000_unmap_and_free_tx_resource(adapter, buffer_info);
2794         }
2795
2796         return 0;
2797 }
2798
2799 static void e1000_tx_queue(struct e1000_adapter *adapter,
2800                            struct e1000_tx_ring *tx_ring, int tx_flags,
2801                            int count)
2802 {
2803         struct e1000_hw *hw = &adapter->hw;
2804         struct e1000_tx_desc *tx_desc = NULL;
2805         struct e1000_buffer *buffer_info;
2806         u32 txd_upper = 0, txd_lower = E1000_TXD_CMD_IFCS;
2807         unsigned int i;
2808
2809         if (likely(tx_flags & E1000_TX_FLAGS_TSO)) {
2810                 txd_lower |= E1000_TXD_CMD_DEXT | E1000_TXD_DTYP_D |
2811                              E1000_TXD_CMD_TSE;
2812                 txd_upper |= E1000_TXD_POPTS_TXSM << 8;
2813
2814                 if (likely(tx_flags & E1000_TX_FLAGS_IPV4))
2815                         txd_upper |= E1000_TXD_POPTS_IXSM << 8;
2816         }
2817
2818         if (likely(tx_flags & E1000_TX_FLAGS_CSUM)) {
2819                 txd_lower |= E1000_TXD_CMD_DEXT | E1000_TXD_DTYP_D;
2820                 txd_upper |= E1000_TXD_POPTS_TXSM << 8;
2821         }
2822
2823         if (unlikely(tx_flags & E1000_TX_FLAGS_VLAN)) {
2824                 txd_lower |= E1000_TXD_CMD_VLE;
2825                 txd_upper |= (tx_flags & E1000_TX_FLAGS_VLAN_MASK);
2826         }
2827
2828         i = tx_ring->next_to_use;
2829
2830         while (count--) {
2831                 buffer_info = &tx_ring->buffer_info[i];
2832                 tx_desc = E1000_TX_DESC(*tx_ring, i);
2833                 tx_desc->buffer_addr = cpu_to_le64(buffer_info->dma);
2834                 tx_desc->lower.data =
2835                         cpu_to_le32(txd_lower | buffer_info->length);
2836                 tx_desc->upper.data = cpu_to_le32(txd_upper);
2837                 if (unlikely(++i == tx_ring->count)) i = 0;
2838         }
2839
2840         tx_desc->lower.data |= cpu_to_le32(adapter->txd_cmd);
2841
2842         /* Force memory writes to complete before letting h/w
2843          * know there are new descriptors to fetch.  (Only
2844          * applicable for weak-ordered memory model archs,
2845          * such as IA-64). */
2846         wmb();
2847
2848         tx_ring->next_to_use = i;
2849         writel(i, hw->hw_addr + tx_ring->tdt);
2850         /* we need this if more than one processor can write to our tail
2851          * at a time, it syncronizes IO on IA64/Altix systems */
2852         mmiowb();
2853 }
2854
2855 /**
2856  * 82547 workaround to avoid controller hang in half-duplex environment.
2857  * The workaround is to avoid queuing a large packet that would span
2858  * the internal Tx FIFO ring boundary by notifying the stack to resend
2859  * the packet at a later time.  This gives the Tx FIFO an opportunity to
2860  * flush all packets.  When that occurs, we reset the Tx FIFO pointers
2861  * to the beginning of the Tx FIFO.
2862  **/
2863
2864 #define E1000_FIFO_HDR                  0x10
2865 #define E1000_82547_PAD_LEN             0x3E0
2866
2867 static int e1000_82547_fifo_workaround(struct e1000_adapter *adapter,
2868                                        struct sk_buff *skb)
2869 {
2870         u32 fifo_space = adapter->tx_fifo_size - adapter->tx_fifo_head;
2871         u32 skb_fifo_len = skb->len + E1000_FIFO_HDR;
2872
2873         skb_fifo_len = ALIGN(skb_fifo_len, E1000_FIFO_HDR);
2874
2875         if (adapter->link_duplex != HALF_DUPLEX)
2876                 goto no_fifo_stall_required;
2877
2878         if (atomic_read(&adapter->tx_fifo_stall))
2879                 return 1;
2880
2881         if (skb_fifo_len >= (E1000_82547_PAD_LEN + fifo_space)) {
2882                 atomic_set(&adapter->tx_fifo_stall, 1);
2883                 return 1;
2884         }
2885
2886 no_fifo_stall_required:
2887         adapter->tx_fifo_head += skb_fifo_len;
2888         if (adapter->tx_fifo_head >= adapter->tx_fifo_size)
2889                 adapter->tx_fifo_head -= adapter->tx_fifo_size;
2890         return 0;
2891 }
2892
2893 static int __e1000_maybe_stop_tx(struct net_device *netdev, int size)
2894 {
2895         struct e1000_adapter *adapter = netdev_priv(netdev);
2896         struct e1000_tx_ring *tx_ring = adapter->tx_ring;
2897
2898         netif_stop_queue(netdev);
2899         /* Herbert's original patch had:
2900          *  smp_mb__after_netif_stop_queue();
2901          * but since that doesn't exist yet, just open code it. */
2902         smp_mb();
2903
2904         /* We need to check again in a case another CPU has just
2905          * made room available. */
2906         if (likely(E1000_DESC_UNUSED(tx_ring) < size))
2907                 return -EBUSY;
2908
2909         /* A reprieve! */
2910         netif_start_queue(netdev);
2911         ++adapter->restart_queue;
2912         return 0;
2913 }
2914
2915 static int e1000_maybe_stop_tx(struct net_device *netdev,
2916                                struct e1000_tx_ring *tx_ring, int size)
2917 {
2918         if (likely(E1000_DESC_UNUSED(tx_ring) >= size))
2919                 return 0;
2920         return __e1000_maybe_stop_tx(netdev, size);
2921 }
2922
2923 #define TXD_USE_COUNT(S, X) (((S) >> (X)) + 1 )
2924 static netdev_tx_t e1000_xmit_frame(struct sk_buff *skb,
2925                                     struct net_device *netdev)
2926 {
2927         struct e1000_adapter *adapter = netdev_priv(netdev);
2928         struct e1000_hw *hw = &adapter->hw;
2929         struct e1000_tx_ring *tx_ring;
2930         unsigned int first, max_per_txd = E1000_MAX_DATA_PER_TXD;
2931         unsigned int max_txd_pwr = E1000_MAX_TXD_PWR;
2932         unsigned int tx_flags = 0;
2933         unsigned int len = skb->len - skb->data_len;
2934         unsigned int nr_frags;
2935         unsigned int mss;
2936         int count = 0;
2937         int tso;
2938         unsigned int f;
2939
2940         /* This goes back to the question of how to logically map a tx queue
2941          * to a flow.  Right now, performance is impacted slightly negatively
2942          * if using multiple tx queues.  If the stack breaks away from a
2943          * single qdisc implementation, we can look at this again. */
2944         tx_ring = adapter->tx_ring;
2945
2946         if (unlikely(skb->len <= 0)) {
2947                 dev_kfree_skb_any(skb);
2948                 return NETDEV_TX_OK;
2949         }
2950
2951         mss = skb_shinfo(skb)->gso_size;
2952         /* The controller does a simple calculation to
2953          * make sure there is enough room in the FIFO before
2954          * initiating the DMA for each buffer.  The calc is:
2955          * 4 = ceil(buffer len/mss).  To make sure we don't
2956          * overrun the FIFO, adjust the max buffer len if mss
2957          * drops. */
2958         if (mss) {
2959                 u8 hdr_len;
2960                 max_per_txd = min(mss << 2, max_per_txd);
2961                 max_txd_pwr = fls(max_per_txd) - 1;
2962
2963                 hdr_len = skb_transport_offset(skb) + tcp_hdrlen(skb);
2964                 if (skb->data_len && hdr_len == len) {
2965                         switch (hw->mac_type) {
2966                                 unsigned int pull_size;
2967                         case e1000_82544:
2968                                 /* Make sure we have room to chop off 4 bytes,
2969                                  * and that the end alignment will work out to
2970                                  * this hardware's requirements
2971                                  * NOTE: this is a TSO only workaround
2972                                  * if end byte alignment not correct move us
2973                                  * into the next dword */
2974                                 if ((unsigned long)(skb_tail_pointer(skb) - 1) & 4)
2975                                         break;
2976                                 /* fall through */
2977                                 pull_size = min((unsigned int)4, skb->data_len);
2978                                 if (!__pskb_pull_tail(skb, pull_size)) {
2979                                         DPRINTK(DRV, ERR,
2980                                                 "__pskb_pull_tail failed.\n");
2981                                         dev_kfree_skb_any(skb);
2982                                         return NETDEV_TX_OK;
2983                                 }
2984                                 len = skb->len - skb->data_len;
2985                                 break;
2986                         default:
2987                                 /* do nothing */
2988                                 break;
2989                         }
2990                 }
2991         }
2992
2993         /* reserve a descriptor for the offload context */
2994         if ((mss) || (skb->ip_summed == CHECKSUM_PARTIAL))
2995                 count++;
2996         count++;
2997
2998         /* Controller Erratum workaround */
2999         if (!skb->data_len && tx_ring->last_tx_tso && !skb_is_gso(skb))
3000                 count++;
3001
3002         count += TXD_USE_COUNT(len, max_txd_pwr);
3003
3004         if (adapter->pcix_82544)
3005                 count++;
3006
3007         /* work-around for errata 10 and it applies to all controllers
3008          * in PCI-X mode, so add one more descriptor to the count
3009          */
3010         if (unlikely((hw->bus_type == e1000_bus_type_pcix) &&
3011                         (len > 2015)))
3012                 count++;
3013
3014         nr_frags = skb_shinfo(skb)->nr_frags;
3015         for (f = 0; f < nr_frags; f++)
3016                 count += TXD_USE_COUNT(skb_shinfo(skb)->frags[f].size,
3017                                        max_txd_pwr);
3018         if (adapter->pcix_82544)
3019                 count += nr_frags;
3020
3021         /* need: count + 2 desc gap to keep tail from touching
3022          * head, otherwise try next time */
3023         if (unlikely(e1000_maybe_stop_tx(netdev, tx_ring, count + 2)))
3024                 return NETDEV_TX_BUSY;
3025
3026         if (unlikely(hw->mac_type == e1000_82547)) {
3027                 if (unlikely(e1000_82547_fifo_workaround(adapter, skb))) {
3028                         netif_stop_queue(netdev);
3029                         if (!test_bit(__E1000_DOWN, &adapter->flags))
3030                                 mod_timer(&adapter->tx_fifo_stall_timer,
3031                                           jiffies + 1);
3032                         return NETDEV_TX_BUSY;
3033                 }
3034         }
3035
3036         if (unlikely(adapter->vlgrp && vlan_tx_tag_present(skb))) {
3037                 tx_flags |= E1000_TX_FLAGS_VLAN;
3038                 tx_flags |= (vlan_tx_tag_get(skb) << E1000_TX_FLAGS_VLAN_SHIFT);
3039         }
3040
3041         first = tx_ring->next_to_use;
3042
3043         tso = e1000_tso(adapter, tx_ring, skb);
3044         if (tso < 0) {
3045                 dev_kfree_skb_any(skb);
3046                 return NETDEV_TX_OK;
3047         }
3048
3049         if (likely(tso)) {
3050                 if (likely(hw->mac_type != e1000_82544))
3051                         tx_ring->last_tx_tso = 1;
3052                 tx_flags |= E1000_TX_FLAGS_TSO;
3053         } else if (likely(e1000_tx_csum(adapter, tx_ring, skb)))
3054                 tx_flags |= E1000_TX_FLAGS_CSUM;
3055
3056         if (likely(skb->protocol == htons(ETH_P_IP)))
3057                 tx_flags |= E1000_TX_FLAGS_IPV4;
3058
3059         count = e1000_tx_map(adapter, tx_ring, skb, first, max_per_txd,
3060                              nr_frags, mss);
3061
3062         if (count) {
3063                 e1000_tx_queue(adapter, tx_ring, tx_flags, count);
3064                 /* Make sure there is space in the ring for the next send. */
3065                 e1000_maybe_stop_tx(netdev, tx_ring, MAX_SKB_FRAGS + 2);
3066
3067         } else {
3068                 dev_kfree_skb_any(skb);
3069                 tx_ring->buffer_info[first].time_stamp = 0;
3070                 tx_ring->next_to_use = first;
3071         }
3072
3073         return NETDEV_TX_OK;
3074 }
3075
3076 /**
3077  * e1000_tx_timeout - Respond to a Tx Hang
3078  * @netdev: network interface device structure
3079  **/
3080
3081 static void e1000_tx_timeout(struct net_device *netdev)
3082 {
3083         struct e1000_adapter *adapter = netdev_priv(netdev);
3084
3085         /* Do the reset outside of interrupt context */
3086         adapter->tx_timeout_count++;
3087         schedule_work(&adapter->reset_task);
3088 }
3089
3090 static void e1000_reset_task(struct work_struct *work)
3091 {
3092         struct e1000_adapter *adapter =
3093                 container_of(work, struct e1000_adapter, reset_task);
3094
3095         e1000_reinit_locked(adapter);
3096 }
3097
3098 /**
3099  * e1000_get_stats - Get System Network Statistics
3100  * @netdev: network interface device structure
3101  *
3102  * Returns the address of the device statistics structure.
3103  * The statistics are actually updated from the timer callback.
3104  **/
3105
3106 static struct net_device_stats *e1000_get_stats(struct net_device *netdev)
3107 {
3108         /* only return the current stats */
3109         return &netdev->stats;
3110 }
3111
3112 /**
3113  * e1000_change_mtu - Change the Maximum Transfer Unit
3114  * @netdev: network interface device structure
3115  * @new_mtu: new value for maximum frame size
3116  *
3117  * Returns 0 on success, negative on failure
3118  **/
3119
3120 static int e1000_change_mtu(struct net_device *netdev, int new_mtu)
3121 {
3122         struct e1000_adapter *adapter = netdev_priv(netdev);
3123         struct e1000_hw *hw = &adapter->hw;
3124         int max_frame = new_mtu + ENET_HEADER_SIZE + ETHERNET_FCS_SIZE;
3125
3126         if ((max_frame < MINIMUM_ETHERNET_FRAME_SIZE) ||
3127             (max_frame > MAX_JUMBO_FRAME_SIZE)) {
3128                 DPRINTK(PROBE, ERR, "Invalid MTU setting\n");
3129                 return -EINVAL;
3130         }
3131
3132         /* Adapter-specific max frame size limits. */
3133         switch (hw->mac_type) {
3134         case e1000_undefined ... e1000_82542_rev2_1:
3135                 if (max_frame > (ETH_FRAME_LEN + ETH_FCS_LEN)) {
3136                         DPRINTK(PROBE, ERR, "Jumbo Frames not supported.\n");
3137                         return -EINVAL;
3138                 }
3139                 break;
3140         default:
3141                 /* Capable of supporting up to MAX_JUMBO_FRAME_SIZE limit. */
3142                 break;
3143         }
3144
3145         while (test_and_set_bit(__E1000_RESETTING, &adapter->flags))
3146                 msleep(1);
3147         /* e1000_down has a dependency on max_frame_size */
3148         hw->max_frame_size = max_frame;
3149         if (netif_running(netdev))
3150                 e1000_down(adapter);
3151
3152         /* NOTE: netdev_alloc_skb reserves 16 bytes, and typically NET_IP_ALIGN
3153          * means we reserve 2 more, this pushes us to allocate from the next
3154          * larger slab size.
3155          * i.e. RXBUFFER_2048 --> size-4096 slab
3156          *  however with the new *_jumbo_rx* routines, jumbo receives will use
3157          *  fragmented skbs */
3158
3159         if (max_frame <= E1000_RXBUFFER_2048)
3160                 adapter->rx_buffer_len = E1000_RXBUFFER_2048;
3161         else
3162 #if (PAGE_SIZE >= E1000_RXBUFFER_16384)
3163                 adapter->rx_buffer_len = E1000_RXBUFFER_16384;
3164 #elif (PAGE_SIZE >= E1000_RXBUFFER_4096)
3165                 adapter->rx_buffer_len = PAGE_SIZE;
3166 #endif
3167
3168         /* adjust allocation if LPE protects us, and we aren't using SBP */
3169         if (!hw->tbi_compatibility_on &&
3170             ((max_frame == (ETH_FRAME_LEN + ETH_FCS_LEN)) ||
3171              (max_frame == MAXIMUM_ETHERNET_VLAN_SIZE)))
3172                 adapter->rx_buffer_len = MAXIMUM_ETHERNET_VLAN_SIZE;
3173
3174         printk(KERN_INFO "e1000: %s changing MTU from %d to %d\n",
3175                netdev->name, netdev->mtu, new_mtu);
3176         netdev->mtu = new_mtu;
3177
3178         if (netif_running(netdev))
3179                 e1000_up(adapter);
3180         else
3181                 e1000_reset(adapter);
3182
3183         clear_bit(__E1000_RESETTING, &adapter->flags);
3184
3185         return 0;
3186 }
3187
3188 /**
3189  * e1000_update_stats - Update the board statistics counters
3190  * @adapter: board private structure
3191  **/
3192
3193 void e1000_update_stats(struct e1000_adapter *adapter)
3194 {
3195         struct net_device *netdev = adapter->netdev;
3196         struct e1000_hw *hw = &adapter->hw;
3197         struct pci_dev *pdev = adapter->pdev;
3198         unsigned long flags;
3199         u16 phy_tmp;
3200
3201 #define PHY_IDLE_ERROR_COUNT_MASK 0x00FF
3202
3203         /*
3204          * Prevent stats update while adapter is being reset, or if the pci
3205          * connection is down.
3206          */
3207         if (adapter->link_speed == 0)
3208                 return;
3209         if (pci_channel_offline(pdev))
3210                 return;
3211
3212         spin_lock_irqsave(&adapter->stats_lock, flags);
3213
3214         /* these counters are modified from e1000_tbi_adjust_stats,
3215          * called from the interrupt context, so they must only
3216          * be written while holding adapter->stats_lock
3217          */
3218
3219         adapter->stats.crcerrs += er32(CRCERRS);
3220         adapter->stats.gprc += er32(GPRC);
3221         adapter->stats.gorcl += er32(GORCL);
3222         adapter->stats.gorch += er32(GORCH);
3223         adapter->stats.bprc += er32(BPRC);
3224         adapter->stats.mprc += er32(MPRC);
3225         adapter->stats.roc += er32(ROC);
3226
3227         adapter->stats.prc64 += er32(PRC64);
3228         adapter->stats.prc127 += er32(PRC127);
3229         adapter->stats.prc255 += er32(PRC255);
3230         adapter->stats.prc511 += er32(PRC511);
3231         adapter->stats.prc1023 += er32(PRC1023);
3232         adapter->stats.prc1522 += er32(PRC1522);
3233
3234         adapter->stats.symerrs += er32(SYMERRS);
3235         adapter->stats.mpc += er32(MPC);
3236         adapter->stats.scc += er32(SCC);
3237         adapter->stats.ecol += er32(ECOL);
3238         adapter->stats.mcc += er32(MCC);
3239         adapter->stats.latecol += er32(LATECOL);
3240         adapter->stats.dc += er32(DC);
3241         adapter->stats.sec += er32(SEC);
3242         adapter->stats.rlec += er32(RLEC);
3243         adapter->stats.xonrxc += er32(XONRXC);
3244         adapter->stats.xontxc += er32(XONTXC);
3245         adapter->stats.xoffrxc += er32(XOFFRXC);
3246         adapter->stats.xofftxc += er32(XOFFTXC);
3247         adapter->stats.fcruc += er32(FCRUC);
3248         adapter->stats.gptc += er32(GPTC);
3249         adapter->stats.gotcl += er32(GOTCL);
3250         adapter->stats.gotch += er32(GOTCH);
3251         adapter->stats.rnbc += er32(RNBC);
3252         adapter->stats.ruc += er32(RUC);
3253         adapter->stats.rfc += er32(RFC);
3254         adapter->stats.rjc += er32(RJC);
3255         adapter->stats.torl += er32(TORL);
3256         adapter->stats.torh += er32(TORH);
3257         adapter->stats.totl += er32(TOTL);
3258         adapter->stats.toth += er32(TOTH);
3259         adapter->stats.tpr += er32(TPR);
3260
3261         adapter->stats.ptc64 += er32(PTC64);
3262         adapter->stats.ptc127 += er32(PTC127);
3263         adapter->stats.ptc255 += er32(PTC255);
3264         adapter->stats.ptc511 += er32(PTC511);
3265         adapter->stats.ptc1023 += er32(PTC1023);
3266         adapter->stats.ptc1522 += er32(PTC1522);
3267
3268         adapter->stats.mptc += er32(MPTC);
3269         adapter->stats.bptc += er32(BPTC);
3270
3271         /* used for adaptive IFS */
3272
3273         hw->tx_packet_delta = er32(TPT);
3274         adapter->stats.tpt += hw->tx_packet_delta;
3275         hw->collision_delta = er32(COLC);
3276         adapter->stats.colc += hw->collision_delta;
3277
3278         if (hw->mac_type >= e1000_82543) {
3279                 adapter->stats.algnerrc += er32(ALGNERRC);
3280                 adapter->stats.rxerrc += er32(RXERRC);
3281                 adapter->stats.tncrs += er32(TNCRS);
3282                 adapter->stats.cexterr += er32(CEXTERR);
3283                 adapter->stats.tsctc += er32(TSCTC);
3284                 adapter->stats.tsctfc += er32(TSCTFC);
3285         }
3286
3287         /* Fill out the OS statistics structure */
3288         netdev->stats.multicast = adapter->stats.mprc;
3289         netdev->stats.collisions = adapter->stats.colc;
3290
3291         /* Rx Errors */
3292
3293         /* RLEC on some newer hardware can be incorrect so build
3294         * our own version based on RUC and ROC */
3295         netdev->stats.rx_errors = adapter->stats.rxerrc +
3296                 adapter->stats.crcerrs + adapter->stats.algnerrc +
3297                 adapter->stats.ruc + adapter->stats.roc +
3298                 adapter->stats.cexterr;
3299         adapter->stats.rlerrc = adapter->stats.ruc + adapter->stats.roc;
3300         netdev->stats.rx_length_errors = adapter->stats.rlerrc;
3301         netdev->stats.rx_crc_errors = adapter->stats.crcerrs;
3302         netdev->stats.rx_frame_errors = adapter->stats.algnerrc;
3303         netdev->stats.rx_missed_errors = adapter->stats.mpc;
3304
3305         /* Tx Errors */
3306         adapter->stats.txerrc = adapter->stats.ecol + adapter->stats.latecol;
3307         netdev->stats.tx_errors = adapter->stats.txerrc;
3308         netdev->stats.tx_aborted_errors = adapter->stats.ecol;
3309         netdev->stats.tx_window_errors = adapter->stats.latecol;
3310         netdev->stats.tx_carrier_errors = adapter->stats.tncrs;
3311         if (hw->bad_tx_carr_stats_fd &&
3312             adapter->link_duplex == FULL_DUPLEX) {
3313                 netdev->stats.tx_carrier_errors = 0;
3314                 adapter->stats.tncrs = 0;
3315         }
3316
3317         /* Tx Dropped needs to be maintained elsewhere */
3318
3319         /* Phy Stats */
3320         if (hw->media_type == e1000_media_type_copper) {
3321                 if ((adapter->link_speed == SPEED_1000) &&
3322                    (!e1000_read_phy_reg(hw, PHY_1000T_STATUS, &phy_tmp))) {
3323                         phy_tmp &= PHY_IDLE_ERROR_COUNT_MASK;
3324                         adapter->phy_stats.idle_errors += phy_tmp;
3325                 }
3326
3327                 if ((hw->mac_type <= e1000_82546) &&
3328                    (hw->phy_type == e1000_phy_m88) &&
3329                    !e1000_read_phy_reg(hw, M88E1000_RX_ERR_CNTR, &phy_tmp))
3330                         adapter->phy_stats.receive_errors += phy_tmp;
3331         }
3332
3333         /* Management Stats */
3334         if (hw->has_smbus) {
3335                 adapter->stats.mgptc += er32(MGTPTC);
3336                 adapter->stats.mgprc += er32(MGTPRC);
3337                 adapter->stats.mgpdc += er32(MGTPDC);
3338         }
3339
3340         spin_unlock_irqrestore(&adapter->stats_lock, flags);
3341 }
3342
3343 /**
3344  * e1000_intr - Interrupt Handler
3345  * @irq: interrupt number
3346  * @data: pointer to a network interface device structure
3347  **/
3348
3349 static irqreturn_t e1000_intr(int irq, void *data)
3350 {
3351         struct net_device *netdev = data;
3352         struct e1000_adapter *adapter = netdev_priv(netdev);
3353         struct e1000_hw *hw = &adapter->hw;
3354         u32 icr = er32(ICR);
3355
3356         if (unlikely((!icr) || test_bit(__E1000_DOWN, &adapter->flags)))
3357                 return IRQ_NONE;  /* Not our interrupt */
3358
3359         if (unlikely(icr & (E1000_ICR_RXSEQ | E1000_ICR_LSC))) {
3360                 hw->get_link_status = 1;
3361                 /* guard against interrupt when we're going down */
3362                 if (!test_bit(__E1000_DOWN, &adapter->flags))
3363                         mod_timer(&adapter->watchdog_timer, jiffies + 1);
3364         }
3365
3366         /* disable interrupts, without the synchronize_irq bit */
3367         ew32(IMC, ~0);
3368         E1000_WRITE_FLUSH();
3369
3370         if (likely(napi_schedule_prep(&adapter->napi))) {
3371                 adapter->total_tx_bytes = 0;
3372                 adapter->total_tx_packets = 0;
3373                 adapter->total_rx_bytes = 0;
3374                 adapter->total_rx_packets = 0;
3375                 __napi_schedule(&adapter->napi);
3376         } else {
3377                 /* this really should not happen! if it does it is basically a
3378                  * bug, but not a hard error, so enable ints and continue */
3379                 if (!test_bit(__E1000_DOWN, &adapter->flags))
3380                         e1000_irq_enable(adapter);
3381         }
3382
3383         return IRQ_HANDLED;
3384 }
3385
3386 /**
3387  * e1000_clean - NAPI Rx polling callback
3388  * @adapter: board private structure
3389  **/
3390 static int e1000_clean(struct napi_struct *napi, int budget)
3391 {
3392         struct e1000_adapter *adapter = container_of(napi, struct e1000_adapter, napi);
3393         int tx_clean_complete = 0, work_done = 0;
3394
3395         tx_clean_complete = e1000_clean_tx_irq(adapter, &adapter->tx_ring[0]);
3396
3397         adapter->clean_rx(adapter, &adapter->rx_ring[0], &work_done, budget);
3398
3399         if (!tx_clean_complete)
3400                 work_done = budget;
3401
3402         /* If budget not fully consumed, exit the polling mode */
3403         if (work_done < budget) {
3404                 if (likely(adapter->itr_setting & 3))
3405                         e1000_set_itr(adapter);
3406                 napi_complete(napi);
3407                 if (!test_bit(__E1000_DOWN, &adapter->flags))
3408                         e1000_irq_enable(adapter);
3409         }
3410
3411         return work_done;
3412 }
3413
3414 /**
3415  * e1000_clean_tx_irq - Reclaim resources after transmit completes
3416  * @adapter: board private structure
3417  **/
3418 static bool e1000_clean_tx_irq(struct e1000_adapter *adapter,
3419                                struct e1000_tx_ring *tx_ring)
3420 {
3421         struct e1000_hw *hw = &adapter->hw;
3422         struct net_device *netdev = adapter->netdev;
3423         struct e1000_tx_desc *tx_desc, *eop_desc;
3424         struct e1000_buffer *buffer_info;
3425         unsigned int i, eop;
3426         unsigned int count = 0;
3427         unsigned int total_tx_bytes=0, total_tx_packets=0;
3428
3429         i = tx_ring->next_to_clean;
3430         eop = tx_ring->buffer_info[i].next_to_watch;
3431         eop_desc = E1000_TX_DESC(*tx_ring, eop);
3432
3433         while ((eop_desc->upper.data & cpu_to_le32(E1000_TXD_STAT_DD)) &&
3434                (count < tx_ring->count)) {
3435                 bool cleaned = false;
3436                 for ( ; !cleaned; count++) {
3437                         tx_desc = E1000_TX_DESC(*tx_ring, i);
3438                         buffer_info = &tx_ring->buffer_info[i];
3439                         cleaned = (i == eop);
3440
3441                         if (cleaned) {
3442                                 struct sk_buff *skb = buffer_info->skb;
3443                                 unsigned int segs, bytecount;
3444                                 segs = skb_shinfo(skb)->gso_segs ?: 1;
3445                                 /* multiply data chunks by size of headers */
3446                                 bytecount = ((segs - 1) * skb_headlen(skb)) +
3447                                             skb->len;
3448                                 total_tx_packets += segs;
3449                                 total_tx_bytes += bytecount;
3450                         }
3451                         e1000_unmap_and_free_tx_resource(adapter, buffer_info);
3452                         tx_desc->upper.data = 0;
3453
3454                         if (unlikely(++i == tx_ring->count)) i = 0;
3455                 }
3456
3457                 eop = tx_ring->buffer_info[i].next_to_watch;
3458                 eop_desc = E1000_TX_DESC(*tx_ring, eop);
3459         }
3460
3461         tx_ring->next_to_clean = i;
3462
3463 #define TX_WAKE_THRESHOLD 32
3464         if (unlikely(count && netif_carrier_ok(netdev) &&
3465                      E1000_DESC_UNUSED(tx_ring) >= TX_WAKE_THRESHOLD)) {
3466                 /* Make sure that anybody stopping the queue after this
3467                  * sees the new next_to_clean.
3468                  */
3469                 smp_mb();
3470
3471                 if (netif_queue_stopped(netdev) &&
3472                     !(test_bit(__E1000_DOWN, &adapter->flags))) {
3473                         netif_wake_queue(netdev);
3474                         ++adapter->restart_queue;
3475                 }
3476         }
3477
3478         if (adapter->detect_tx_hung) {
3479                 /* Detect a transmit hang in hardware, this serializes the
3480                  * check with the clearing of time_stamp and movement of i */
3481                 adapter->detect_tx_hung = false;
3482                 if (tx_ring->buffer_info[eop].time_stamp &&
3483                     time_after(jiffies, tx_ring->buffer_info[eop].time_stamp +
3484                                (adapter->tx_timeout_factor * HZ)) &&
3485                     !(er32(STATUS) & E1000_STATUS_TXOFF)) {
3486
3487                         /* detected Tx unit hang */
3488                         DPRINTK(DRV, ERR, "Detected Tx Unit Hang\n"
3489                                         "  Tx Queue             <%lu>\n"
3490                                         "  TDH                  <%x>\n"
3491                                         "  TDT                  <%x>\n"
3492                                         "  next_to_use          <%x>\n"
3493                                         "  next_to_clean        <%x>\n"
3494                                         "buffer_info[next_to_clean]\n"
3495                                         "  time_stamp           <%lx>\n"
3496                                         "  next_to_watch        <%x>\n"
3497                                         "  jiffies              <%lx>\n"
3498                                         "  next_to_watch.status <%x>\n",
3499                                 (unsigned long)((tx_ring - adapter->tx_ring) /
3500                                         sizeof(struct e1000_tx_ring)),
3501                                 readl(hw->hw_addr + tx_ring->tdh),
3502                                 readl(hw->hw_addr + tx_ring->tdt),
3503                                 tx_ring->next_to_use,
3504                                 tx_ring->next_to_clean,
3505                                 tx_ring->buffer_info[eop].time_stamp,
3506                                 eop,
3507                                 jiffies,
3508                                 eop_desc->upper.fields.status);
3509                         netif_stop_queue(netdev);
3510                 }
3511         }
3512         adapter->total_tx_bytes += total_tx_bytes;
3513         adapter->total_tx_packets += total_tx_packets;
3514         netdev->stats.tx_bytes += total_tx_bytes;
3515         netdev->stats.tx_packets += total_tx_packets;
3516         return (count < tx_ring->count);
3517 }
3518
3519 /**
3520  * e1000_rx_checksum - Receive Checksum Offload for 82543
3521  * @adapter:     board private structure
3522  * @status_err:  receive descriptor status and error fields
3523  * @csum:        receive descriptor csum field
3524  * @sk_buff:     socket buffer with received data
3525  **/
3526
3527 static void e1000_rx_checksum(struct e1000_adapter *adapter, u32 status_err,
3528                               u32 csum, struct sk_buff *skb)
3529 {
3530         struct e1000_hw *hw = &adapter->hw;
3531         u16 status = (u16)status_err;
3532         u8 errors = (u8)(status_err >> 24);
3533         skb->ip_summed = CHECKSUM_NONE;
3534
3535         /* 82543 or newer only */
3536         if (unlikely(hw->mac_type < e1000_82543)) return;
3537         /* Ignore Checksum bit is set */
3538         if (unlikely(status & E1000_RXD_STAT_IXSM)) return;
3539         /* TCP/UDP checksum error bit is set */
3540         if (unlikely(errors & E1000_RXD_ERR_TCPE)) {
3541                 /* let the stack verify checksum errors */
3542                 adapter->hw_csum_err++;
3543                 return;
3544         }
3545         /* TCP/UDP Checksum has not been calculated */
3546         if (!(status & E1000_RXD_STAT_TCPCS))
3547                 return;
3548
3549         /* It must be a TCP or UDP packet with a valid checksum */
3550         if (likely(status & E1000_RXD_STAT_TCPCS)) {
3551                 /* TCP checksum is good */
3552                 skb->ip_summed = CHECKSUM_UNNECESSARY;
3553         }
3554         adapter->hw_csum_good++;
3555 }
3556
3557 /**
3558  * e1000_consume_page - helper function
3559  **/
3560 static void e1000_consume_page(struct e1000_buffer *bi, struct sk_buff *skb,
3561                                u16 length)
3562 {
3563         bi->page = NULL;
3564         skb->len += length;
3565         skb->data_len += length;
3566         skb->truesize += length;
3567 }
3568
3569 /**
3570  * e1000_receive_skb - helper function to handle rx indications
3571  * @adapter: board private structure
3572  * @status: descriptor status field as written by hardware
3573  * @vlan: descriptor vlan field as written by hardware (no le/be conversion)
3574  * @skb: pointer to sk_buff to be indicated to stack
3575  */
3576 static void e1000_receive_skb(struct e1000_adapter *adapter, u8 status,
3577                               __le16 vlan, struct sk_buff *skb)
3578 {
3579         if (unlikely(adapter->vlgrp && (status & E1000_RXD_STAT_VP))) {
3580                 vlan_hwaccel_receive_skb(skb, adapter->vlgrp,
3581                                          le16_to_cpu(vlan) &
3582                                          E1000_RXD_SPC_VLAN_MASK);
3583         } else {
3584                 netif_receive_skb(skb);
3585         }
3586 }
3587
3588 /**
3589  * e1000_clean_jumbo_rx_irq - Send received data up the network stack; legacy
3590  * @adapter: board private structure
3591  * @rx_ring: ring to clean
3592  * @work_done: amount of napi work completed this call
3593  * @work_to_do: max amount of work allowed for this call to do
3594  *
3595  * the return value indicates whether actual cleaning was done, there
3596  * is no guarantee that everything was cleaned
3597  */
3598 static bool e1000_clean_jumbo_rx_irq(struct e1000_adapter *adapter,
3599                                      struct e1000_rx_ring *rx_ring,
3600                                      int *work_done, int work_to_do)
3601 {
3602         struct e1000_hw *hw = &adapter->hw;
3603         struct net_device *netdev = adapter->netdev;
3604         struct pci_dev *pdev = adapter->pdev;
3605         struct e1000_rx_desc *rx_desc, *next_rxd;
3606         struct e1000_buffer *buffer_info, *next_buffer;
3607         unsigned long irq_flags;
3608         u32 length;
3609         unsigned int i;
3610         int cleaned_count = 0;
3611         bool cleaned = false;
3612         unsigned int total_rx_bytes=0, total_rx_packets=0;
3613
3614         i = rx_ring->next_to_clean;
3615         rx_desc = E1000_RX_DESC(*rx_ring, i);
3616         buffer_info = &rx_ring->buffer_info[i];
3617
3618         while (rx_desc->status & E1000_RXD_STAT_DD) {
3619                 struct sk_buff *skb;
3620                 u8 status;
3621
3622                 if (*work_done >= work_to_do)
3623                         break;
3624                 (*work_done)++;
3625
3626                 status = rx_desc->status;
3627                 skb = buffer_info->skb;
3628                 buffer_info->skb = NULL;
3629
3630                 if (++i == rx_ring->count) i = 0;
3631                 next_rxd = E1000_RX_DESC(*rx_ring, i);
3632                 prefetch(next_rxd);
3633
3634                 next_buffer = &rx_ring->buffer_info[i];
3635
3636                 cleaned = true;
3637                 cleaned_count++;
3638                 pci_unmap_page(pdev, buffer_info->dma, buffer_info->length,
3639                                PCI_DMA_FROMDEVICE);
3640                 buffer_info->dma = 0;
3641
3642                 length = le16_to_cpu(rx_desc->length);
3643
3644                 /* errors is only valid for DD + EOP descriptors */
3645                 if (unlikely((status & E1000_RXD_STAT_EOP) &&
3646                     (rx_desc->errors & E1000_RXD_ERR_FRAME_ERR_MASK))) {
3647                         u8 last_byte = *(skb->data + length - 1);
3648                         if (TBI_ACCEPT(hw, status, rx_desc->errors, length,
3649                                        last_byte)) {
3650                                 spin_lock_irqsave(&adapter->stats_lock,
3651                                                   irq_flags);
3652                                 e1000_tbi_adjust_stats(hw, &adapter->stats,
3653                                                        length, skb->data);
3654                                 spin_unlock_irqrestore(&adapter->stats_lock,
3655                                                        irq_flags);
3656                                 length--;
3657                         } else {
3658                                 /* recycle both page and skb */
3659                                 buffer_info->skb = skb;
3660                                 /* an error means any chain goes out the window
3661                                  * too */
3662                                 if (rx_ring->rx_skb_top)
3663                                         dev_kfree_skb(rx_ring->rx_skb_top);
3664                                 rx_ring->rx_skb_top = NULL;
3665                                 goto next_desc;
3666                         }
3667                 }
3668
3669 #define rxtop rx_ring->rx_skb_top
3670                 if (!(status & E1000_RXD_STAT_EOP)) {
3671                         /* this descriptor is only the beginning (or middle) */
3672                         if (!rxtop) {
3673                                 /* this is the beginning of a chain */
3674                                 rxtop = skb;
3675                                 skb_fill_page_desc(rxtop, 0, buffer_info->page,
3676                                                    0, length);
3677                         } else {
3678                                 /* this is the middle of a chain */
3679                                 skb_fill_page_desc(rxtop,
3680                                     skb_shinfo(rxtop)->nr_frags,
3681                                     buffer_info->page, 0, length);
3682                                 /* re-use the skb, only consumed the page */
3683                                 buffer_info->skb = skb;
3684                         }
3685                         e1000_consume_page(buffer_info, rxtop, length);
3686                         goto next_desc;
3687                 } else {
3688                         if (rxtop) {
3689                                 /* end of the chain */
3690                                 skb_fill_page_desc(rxtop,
3691                                     skb_shinfo(rxtop)->nr_frags,
3692                                     buffer_info->page, 0, length);
3693                                 /* re-use the current skb, we only consumed the
3694                                  * page */
3695                                 buffer_info->skb = skb;
3696                                 skb = rxtop;
3697                                 rxtop = NULL;
3698                                 e1000_consume_page(buffer_info, skb, length);
3699                         } else {
3700                                 /* no chain, got EOP, this buf is the packet
3701                                  * copybreak to save the put_page/alloc_page */
3702                                 if (length <= copybreak &&
3703                                     skb_tailroom(skb) >= length) {
3704                                         u8 *vaddr;
3705                                         vaddr = kmap_atomic(buffer_info->page,
3706                                                             KM_SKB_DATA_SOFTIRQ);
3707                                         memcpy(skb_tail_pointer(skb), vaddr, length);
3708                                         kunmap_atomic(vaddr,
3709                                                       KM_SKB_DATA_SOFTIRQ);
3710                                         /* re-use the page, so don't erase
3711                                          * buffer_info->page */
3712                                         skb_put(skb, length);
3713                                 } else {
3714                                         skb_fill_page_desc(skb, 0,
3715                                                            buffer_info->page, 0,
3716                                                            length);
3717                                         e1000_consume_page(buffer_info, skb,
3718                                                            length);
3719                                 }
3720                         }
3721                 }
3722
3723                 /* Receive Checksum Offload XXX recompute due to CRC strip? */
3724                 e1000_rx_checksum(adapter,
3725                                   (u32)(status) |
3726                                   ((u32)(rx_desc->errors) << 24),
3727                                   le16_to_cpu(rx_desc->csum), skb);
3728
3729                 pskb_trim(skb, skb->len - 4);
3730
3731                 /* probably a little skewed due to removing CRC */
3732                 total_rx_bytes += skb->len;
3733                 total_rx_packets++;
3734
3735                 /* eth type trans needs skb->data to point to something */
3736                 if (!pskb_may_pull(skb, ETH_HLEN)) {
3737                         DPRINTK(DRV, ERR, "pskb_may_pull failed.\n");
3738                         dev_kfree_skb(skb);
3739                         goto next_desc;
3740                 }
3741
3742                 skb->protocol = eth_type_trans(skb, netdev);
3743
3744                 e1000_receive_skb(adapter, status, rx_desc->special, skb);
3745
3746 next_desc:
3747                 rx_desc->status = 0;
3748
3749                 /* return some buffers to hardware, one at a time is too slow */
3750                 if (unlikely(cleaned_count >= E1000_RX_BUFFER_WRITE)) {
3751                         adapter->alloc_rx_buf(adapter, rx_ring, cleaned_count);
3752                         cleaned_count = 0;
3753                 }
3754
3755                 /* use prefetched values */
3756                 rx_desc = next_rxd;
3757                 buffer_info = next_buffer;
3758         }
3759         rx_ring->next_to_clean = i;
3760
3761         cleaned_count = E1000_DESC_UNUSED(rx_ring);
3762         if (cleaned_count)
3763                 adapter->alloc_rx_buf(adapter, rx_ring, cleaned_count);
3764
3765         adapter->total_rx_packets += total_rx_packets;
3766         adapter->total_rx_bytes += total_rx_bytes;
3767         netdev->stats.rx_bytes += total_rx_bytes;
3768         netdev->stats.rx_packets += total_rx_packets;
3769         return cleaned;
3770 }
3771
3772 /**
3773  * e1000_clean_rx_irq - Send received data up the network stack; legacy
3774  * @adapter: board private structure
3775  * @rx_ring: ring to clean
3776  * @work_done: amount of napi work completed this call
3777  * @work_to_do: max amount of work allowed for this call to do
3778  */
3779 static bool e1000_clean_rx_irq(struct e1000_adapter *adapter,
3780                                struct e1000_rx_ring *rx_ring,
3781                                int *work_done, int work_to_do)
3782 {
3783         struct e1000_hw *hw = &adapter->hw;
3784         struct net_device *netdev = adapter->netdev;
3785         struct pci_dev *pdev = adapter->pdev;
3786         struct e1000_rx_desc *rx_desc, *next_rxd;
3787         struct e1000_buffer *buffer_info, *next_buffer;
3788         unsigned long flags;
3789         u32 length;
3790         unsigned int i;
3791         int cleaned_count = 0;
3792         bool cleaned = false;
3793         unsigned int total_rx_bytes=0, total_rx_packets=0;
3794
3795         i = rx_ring->next_to_clean;
3796         rx_desc = E1000_RX_DESC(*rx_ring, i);
3797         buffer_info = &rx_ring->buffer_info[i];
3798
3799         while (rx_desc->status & E1000_RXD_STAT_DD) {
3800                 struct sk_buff *skb;
3801                 u8 status;
3802
3803                 if (*work_done >= work_to_do)
3804                         break;
3805                 (*work_done)++;
3806
3807                 status = rx_desc->status;
3808                 skb = buffer_info->skb;
3809                 buffer_info->skb = NULL;
3810
3811                 prefetch(skb->data - NET_IP_ALIGN);
3812
3813                 if (++i == rx_ring->count) i = 0;
3814                 next_rxd = E1000_RX_DESC(*rx_ring, i);
3815                 prefetch(next_rxd);
3816
3817                 next_buffer = &rx_ring->buffer_info[i];
3818
3819                 cleaned = true;
3820                 cleaned_count++;
3821                 pci_unmap_single(pdev, buffer_info->dma, buffer_info->length,
3822                                  PCI_DMA_FROMDEVICE);
3823                 buffer_info->dma = 0;
3824
3825                 length = le16_to_cpu(rx_desc->length);
3826                 /* !EOP means multiple descriptors were used to store a single
3827                  * packet, if thats the case we need to toss it.  In fact, we
3828                  * to toss every packet with the EOP bit clear and the next
3829                  * frame that _does_ have the EOP bit set, as it is by
3830                  * definition only a frame fragment
3831                  */
3832                 if (unlikely(!(status & E1000_RXD_STAT_EOP)))
3833                         adapter->discarding = true;
3834
3835                 if (adapter->discarding) {
3836                         /* All receives must fit into a single buffer */
3837                         E1000_DBG("%s: Receive packet consumed multiple"
3838                                   " buffers\n", netdev->name);
3839                         /* recycle */
3840                         buffer_info->skb = skb;
3841                         if (status & E1000_RXD_STAT_EOP)
3842                                 adapter->discarding = false;
3843                         goto next_desc;
3844                 }
3845
3846                 if (unlikely(rx_desc->errors & E1000_RXD_ERR_FRAME_ERR_MASK)) {
3847                         u8 last_byte = *(skb->data + length - 1);
3848                         if (TBI_ACCEPT(hw, status, rx_desc->errors, length,
3849                                        last_byte)) {
3850                                 spin_lock_irqsave(&adapter->stats_lock, flags);
3851                                 e1000_tbi_adjust_stats(hw, &adapter->stats,
3852                                                        length, skb->data);
3853                                 spin_unlock_irqrestore(&adapter->stats_lock,
3854                                                        flags);
3855                                 length--;
3856                         } else {
3857                                 /* recycle */
3858                                 buffer_info->skb = skb;
3859                                 goto next_desc;
3860                         }
3861                 }
3862
3863                 /* adjust length to remove Ethernet CRC, this must be
3864                  * done after the TBI_ACCEPT workaround above */
3865                 length -= 4;
3866
3867                 /* probably a little skewed due to removing CRC */
3868                 total_rx_bytes += length;
3869                 total_rx_packets++;
3870
3871                 /* code added for copybreak, this should improve
3872                  * performance for small packets with large amounts
3873                  * of reassembly being done in the stack */
3874                 if (length < copybreak) {
3875                         struct sk_buff *new_skb =
3876                             netdev_alloc_skb_ip_align(netdev, length);
3877                         if (new_skb) {
3878                                 skb_copy_to_linear_data_offset(new_skb,
3879                                                                -NET_IP_ALIGN,
3880                                                                (skb->data -
3881                                                                 NET_IP_ALIGN),
3882                                                                (length +
3883                                                                 NET_IP_ALIGN));
3884                                 /* save the skb in buffer_info as good */
3885                                 buffer_info->skb = skb;
3886                                 skb = new_skb;
3887                         }
3888                         /* else just continue with the old one */
3889                 }
3890                 /* end copybreak code */
3891                 skb_put(skb, length);
3892
3893                 /* Receive Checksum Offload */
3894                 e1000_rx_checksum(adapter,
3895                                   (u32)(status) |
3896                                   ((u32)(rx_desc->errors) << 24),
3897                                   le16_to_cpu(rx_desc->csum), skb);
3898
3899                 skb->protocol = eth_type_trans(skb, netdev);
3900
3901                 e1000_receive_skb(adapter, status, rx_desc->special, skb);
3902
3903 next_desc:
3904                 rx_desc->status = 0;
3905
3906                 /* return some buffers to hardware, one at a time is too slow */
3907                 if (unlikely(cleaned_count >= E1000_RX_BUFFER_WRITE)) {
3908                         adapter->alloc_rx_buf(adapter, rx_ring, cleaned_count);
3909                         cleaned_count = 0;
3910                 }
3911
3912                 /* use prefetched values */
3913                 rx_desc = next_rxd;
3914                 buffer_info = next_buffer;
3915         }
3916         rx_ring->next_to_clean = i;
3917
3918         cleaned_count = E1000_DESC_UNUSED(rx_ring);
3919         if (cleaned_count)
3920                 adapter->alloc_rx_buf(adapter, rx_ring, cleaned_count);
3921
3922         adapter->total_rx_packets += total_rx_packets;
3923         adapter->total_rx_bytes += total_rx_bytes;
3924         netdev->stats.rx_bytes += total_rx_bytes;
3925         netdev->stats.rx_packets += total_rx_packets;
3926         return cleaned;
3927 }
3928
3929 /**
3930  * e1000_alloc_jumbo_rx_buffers - Replace used jumbo receive buffers
3931  * @adapter: address of board private structure
3932  * @rx_ring: pointer to receive ring structure
3933  * @cleaned_count: number of buffers to allocate this pass
3934  **/
3935
3936 static void
3937 e1000_alloc_jumbo_rx_buffers(struct e1000_adapter *adapter,
3938                              struct e1000_rx_ring *rx_ring, int cleaned_count)
3939 {
3940         struct net_device *netdev = adapter->netdev;
3941         struct pci_dev *pdev = adapter->pdev;
3942         struct e1000_rx_desc *rx_desc;
3943         struct e1000_buffer *buffer_info;
3944         struct sk_buff *skb;
3945         unsigned int i;
3946         unsigned int bufsz = 256 - 16 /*for skb_reserve */ ;
3947
3948         i = rx_ring->next_to_use;
3949         buffer_info = &rx_ring->buffer_info[i];
3950
3951         while (cleaned_count--) {
3952                 skb = buffer_info->skb;
3953                 if (skb) {
3954                         skb_trim(skb, 0);
3955                         goto check_page;
3956                 }
3957
3958                 skb = netdev_alloc_skb_ip_align(netdev, bufsz);
3959                 if (unlikely(!skb)) {
3960                         /* Better luck next round */
3961                         adapter->alloc_rx_buff_failed++;
3962                         break;
3963                 }
3964
3965                 /* Fix for errata 23, can't cross 64kB boundary */
3966                 if (!e1000_check_64k_bound(adapter, skb->data, bufsz)) {
3967                         struct sk_buff *oldskb = skb;
3968                         DPRINTK(PROBE, ERR, "skb align check failed: %u bytes "
3969                                              "at %p\n", bufsz, skb->data);
3970                         /* Try again, without freeing the previous */
3971                         skb = netdev_alloc_skb_ip_align(netdev, bufsz);
3972                         /* Failed allocation, critical failure */
3973                         if (!skb) {
3974                                 dev_kfree_skb(oldskb);
3975                                 adapter->alloc_rx_buff_failed++;
3976                                 break;
3977                         }
3978
3979                         if (!e1000_check_64k_bound(adapter, skb->data, bufsz)) {
3980                                 /* give up */
3981                                 dev_kfree_skb(skb);
3982                                 dev_kfree_skb(oldskb);
3983                                 break; /* while (cleaned_count--) */
3984                         }
3985
3986                         /* Use new allocation */
3987                         dev_kfree_skb(oldskb);
3988                 }
3989                 buffer_info->skb = skb;
3990                 buffer_info->length = adapter->rx_buffer_len;
3991 check_page:
3992                 /* allocate a new page if necessary */
3993                 if (!buffer_info->page) {
3994                         buffer_info->page = alloc_page(GFP_ATOMIC);
3995                         if (unlikely(!buffer_info->page)) {
3996                                 adapter->alloc_rx_buff_failed++;
3997                                 break;
3998                         }
3999                 }
4000
4001                 if (!buffer_info->dma) {
4002                         buffer_info->dma = pci_map_page(pdev,
4003                                                         buffer_info->page, 0,
4004                                                         buffer_info->length,
4005                                                         PCI_DMA_FROMDEVICE);
4006                         if (pci_dma_mapping_error(pdev, buffer_info->dma)) {
4007                                 put_page(buffer_info->page);
4008                                 dev_kfree_skb(skb);
4009                                 buffer_info->page = NULL;
4010                                 buffer_info->skb = NULL;
4011                                 buffer_info->dma = 0;
4012                                 adapter->alloc_rx_buff_failed++;
4013                                 break; /* while !buffer_info->skb */
4014                         }
4015                 }
4016
4017                 rx_desc = E1000_RX_DESC(*rx_ring, i);
4018                 rx_desc->buffer_addr = cpu_to_le64(buffer_info->dma);
4019
4020                 if (unlikely(++i == rx_ring->count))
4021                         i = 0;
4022                 buffer_info = &rx_ring->buffer_info[i];
4023         }
4024
4025         if (likely(rx_ring->next_to_use != i)) {
4026                 rx_ring->next_to_use = i;
4027                 if (unlikely(i-- == 0))
4028                         i = (rx_ring->count - 1);
4029
4030                 /* Force memory writes to complete before letting h/w
4031                  * know there are new descriptors to fetch.  (Only
4032                  * applicable for weak-ordered memory model archs,
4033                  * such as IA-64). */
4034                 wmb();
4035                 writel(i, adapter->hw.hw_addr + rx_ring->rdt);
4036         }
4037 }
4038
4039 /**
4040  * e1000_alloc_rx_buffers - Replace used receive buffers; legacy & extended
4041  * @adapter: address of board private structure
4042  **/
4043
4044 static void e1000_alloc_rx_buffers(struct e1000_adapter *adapter,
4045                                    struct e1000_rx_ring *rx_ring,
4046                                    int cleaned_count)
4047 {
4048         struct e1000_hw *hw = &adapter->hw;
4049         struct net_device *netdev = adapter->netdev;
4050         struct pci_dev *pdev = adapter->pdev;
4051         struct e1000_rx_desc *rx_desc;
4052         struct e1000_buffer *buffer_info;
4053         struct sk_buff *skb;
4054         unsigned int i;
4055         unsigned int bufsz = adapter->rx_buffer_len;
4056
4057         i = rx_ring->next_to_use;
4058         buffer_info = &rx_ring->buffer_info[i];
4059
4060         while (cleaned_count--) {
4061                 skb = buffer_info->skb;
4062                 if (skb) {
4063                         skb_trim(skb, 0);
4064                         goto map_skb;
4065                 }
4066
4067                 skb = netdev_alloc_skb_ip_align(netdev, bufsz);
4068                 if (unlikely(!skb)) {
4069                         /* Better luck next round */
4070                         adapter->alloc_rx_buff_failed++;
4071                         break;
4072                 }
4073
4074                 /* Fix for errata 23, can't cross 64kB boundary */
4075                 if (!e1000_check_64k_bound(adapter, skb->data, bufsz)) {
4076                         struct sk_buff *oldskb = skb;
4077                         DPRINTK(RX_ERR, ERR, "skb align check failed: %u bytes "
4078                                              "at %p\n", bufsz, skb->data);
4079                         /* Try again, without freeing the previous */
4080                         skb = netdev_alloc_skb_ip_align(netdev, bufsz);
4081                         /* Failed allocation, critical failure */
4082                         if (!skb) {
4083                                 dev_kfree_skb(oldskb);
4084                                 adapter->alloc_rx_buff_failed++;
4085                                 break;
4086                         }
4087
4088                         if (!e1000_check_64k_bound(adapter, skb->data, bufsz)) {
4089                                 /* give up */
4090                                 dev_kfree_skb(skb);
4091                                 dev_kfree_skb(oldskb);
4092                                 adapter->alloc_rx_buff_failed++;
4093                                 break; /* while !buffer_info->skb */
4094                         }
4095
4096                         /* Use new allocation */
4097                         dev_kfree_skb(oldskb);
4098                 }
4099                 buffer_info->skb = skb;
4100                 buffer_info->length = adapter->rx_buffer_len;
4101 map_skb:
4102                 buffer_info->dma = pci_map_single(pdev,
4103                                                   skb->data,
4104                                                   buffer_info->length,
4105                                                   PCI_DMA_FROMDEVICE);
4106                 if (pci_dma_mapping_error(pdev, buffer_info->dma)) {
4107                         dev_kfree_skb(skb);
4108                         buffer_info->skb = NULL;
4109                         buffer_info->dma = 0;
4110                         adapter->alloc_rx_buff_failed++;
4111                         break; /* while !buffer_info->skb */
4112                 }
4113
4114                 /*
4115                  * XXX if it was allocated cleanly it will never map to a
4116                  * boundary crossing
4117                  */
4118
4119                 /* Fix for errata 23, can't cross 64kB boundary */
4120                 if (!e1000_check_64k_bound(adapter,
4121                                         (void *)(unsigned long)buffer_info->dma,
4122                                         adapter->rx_buffer_len)) {
4123                         DPRINTK(RX_ERR, ERR,
4124                                 "dma align check failed: %u bytes at %p\n",
4125                                 adapter->rx_buffer_len,
4126                                 (void *)(unsigned long)buffer_info->dma);
4127                         dev_kfree_skb(skb);
4128                         buffer_info->skb = NULL;
4129
4130                         pci_unmap_single(pdev, buffer_info->dma,
4131                                          adapter->rx_buffer_len,
4132                                          PCI_DMA_FROMDEVICE);
4133                         buffer_info->dma = 0;
4134
4135                         adapter->alloc_rx_buff_failed++;
4136                         break; /* while !buffer_info->skb */
4137                 }
4138                 rx_desc = E1000_RX_DESC(*rx_ring, i);
4139                 rx_desc->buffer_addr = cpu_to_le64(buffer_info->dma);
4140
4141                 if (unlikely(++i == rx_ring->count))
4142                         i = 0;
4143                 buffer_info = &rx_ring->buffer_info[i];
4144         }
4145
4146         if (likely(rx_ring->next_to_use != i)) {
4147                 rx_ring->next_to_use = i;
4148                 if (unlikely(i-- == 0))
4149                         i = (rx_ring->count - 1);
4150
4151                 /* Force memory writes to complete before letting h/w
4152                  * know there are new descriptors to fetch.  (Only
4153                  * applicable for weak-ordered memory model archs,
4154                  * such as IA-64). */
4155                 wmb();
4156                 writel(i, hw->hw_addr + rx_ring->rdt);
4157         }
4158 }
4159
4160 /**
4161  * e1000_smartspeed - Workaround for SmartSpeed on 82541 and 82547 controllers.
4162  * @adapter:
4163  **/
4164
4165 static void e1000_smartspeed(struct e1000_adapter *adapter)
4166 {
4167         struct e1000_hw *hw = &adapter->hw;
4168         u16 phy_status;
4169         u16 phy_ctrl;
4170
4171         if ((hw->phy_type != e1000_phy_igp) || !hw->autoneg ||
4172            !(hw->autoneg_advertised & ADVERTISE_1000_FULL))
4173                 return;
4174
4175         if (adapter->smartspeed == 0) {
4176                 /* If Master/Slave config fault is asserted twice,
4177                  * we assume back-to-back */
4178                 e1000_read_phy_reg(hw, PHY_1000T_STATUS, &phy_status);
4179                 if (!(phy_status & SR_1000T_MS_CONFIG_FAULT)) return;
4180                 e1000_read_phy_reg(hw, PHY_1000T_STATUS, &phy_status);
4181                 if (!(phy_status & SR_1000T_MS_CONFIG_FAULT)) return;
4182                 e1000_read_phy_reg(hw, PHY_1000T_CTRL, &phy_ctrl);
4183                 if (phy_ctrl & CR_1000T_MS_ENABLE) {
4184                         phy_ctrl &= ~CR_1000T_MS_ENABLE;
4185                         e1000_write_phy_reg(hw, PHY_1000T_CTRL,
4186                                             phy_ctrl);
4187                         adapter->smartspeed++;
4188                         if (!e1000_phy_setup_autoneg(hw) &&
4189                            !e1000_read_phy_reg(hw, PHY_CTRL,
4190                                                &phy_ctrl)) {
4191                                 phy_ctrl |= (MII_CR_AUTO_NEG_EN |
4192                                              MII_CR_RESTART_AUTO_NEG);
4193                                 e1000_write_phy_reg(hw, PHY_CTRL,
4194                                                     phy_ctrl);
4195                         }
4196                 }
4197                 return;
4198         } else if (adapter->smartspeed == E1000_SMARTSPEED_DOWNSHIFT) {
4199                 /* If still no link, perhaps using 2/3 pair cable */
4200                 e1000_read_phy_reg(hw, PHY_1000T_CTRL, &phy_ctrl);
4201                 phy_ctrl |= CR_1000T_MS_ENABLE;
4202                 e1000_write_phy_reg(hw, PHY_1000T_CTRL, phy_ctrl);
4203                 if (!e1000_phy_setup_autoneg(hw) &&
4204                    !e1000_read_phy_reg(hw, PHY_CTRL, &phy_ctrl)) {
4205                         phy_ctrl |= (MII_CR_AUTO_NEG_EN |
4206                                      MII_CR_RESTART_AUTO_NEG);
4207                         e1000_write_phy_reg(hw, PHY_CTRL, phy_ctrl);
4208                 }
4209         }
4210         /* Restart process after E1000_SMARTSPEED_MAX iterations */
4211         if (adapter->smartspeed++ == E1000_SMARTSPEED_MAX)
4212                 adapter->smartspeed = 0;
4213 }
4214
4215 /**
4216  * e1000_ioctl -
4217  * @netdev:
4218  * @ifreq:
4219  * @cmd:
4220  **/
4221
4222 static int e1000_ioctl(struct net_device *netdev, struct ifreq *ifr, int cmd)
4223 {
4224         switch (cmd) {
4225         case SIOCGMIIPHY:
4226         case SIOCGMIIREG:
4227         case SIOCSMIIREG:
4228                 return e1000_mii_ioctl(netdev, ifr, cmd);
4229         default:
4230                 return -EOPNOTSUPP;
4231         }
4232 }
4233
4234 /**
4235  * e1000_mii_ioctl -
4236  * @netdev:
4237  * @ifreq:
4238  * @cmd:
4239  **/
4240
4241 static int e1000_mii_ioctl(struct net_device *netdev, struct ifreq *ifr,
4242                            int cmd)
4243 {
4244         struct e1000_adapter *adapter = netdev_priv(netdev);
4245         struct e1000_hw *hw = &adapter->hw;
4246         struct mii_ioctl_data *data = if_mii(ifr);
4247         int retval;
4248         u16 mii_reg;
4249         u16 spddplx;
4250         unsigned long flags;
4251
4252         if (hw->media_type != e1000_media_type_copper)
4253                 return -EOPNOTSUPP;
4254
4255         switch (cmd) {
4256         case SIOCGMIIPHY:
4257                 data->phy_id = hw->phy_addr;
4258                 break;
4259         case SIOCGMIIREG:
4260                 spin_lock_irqsave(&adapter->stats_lock, flags);
4261                 if (e1000_read_phy_reg(hw, data->reg_num & 0x1F,
4262                                    &data->val_out)) {
4263                         spin_unlock_irqrestore(&adapter->stats_lock, flags);
4264                         return -EIO;
4265                 }
4266                 spin_unlock_irqrestore(&adapter->stats_lock, flags);
4267                 break;
4268         case SIOCSMIIREG:
4269                 if (data->reg_num & ~(0x1F))
4270                         return -EFAULT;
4271                 mii_reg = data->val_in;
4272                 spin_lock_irqsave(&adapter->stats_lock, flags);
4273                 if (e1000_write_phy_reg(hw, data->reg_num,
4274                                         mii_reg)) {
4275                         spin_unlock_irqrestore(&adapter->stats_lock, flags);
4276                         return -EIO;
4277                 }
4278                 spin_unlock_irqrestore(&adapter->stats_lock, flags);
4279                 if (hw->media_type == e1000_media_type_copper) {
4280                         switch (data->reg_num) {
4281                         case PHY_CTRL:
4282                                 if (mii_reg & MII_CR_POWER_DOWN)
4283                                         break;
4284                                 if (mii_reg & MII_CR_AUTO_NEG_EN) {
4285                                         hw->autoneg = 1;
4286                                         hw->autoneg_advertised = 0x2F;
4287                                 } else {
4288                                         if (mii_reg & 0x40)
4289                                                 spddplx = SPEED_1000;
4290                                         else if (mii_reg & 0x2000)
4291                                                 spddplx = SPEED_100;
4292                                         else
4293                                                 spddplx = SPEED_10;
4294                                         spddplx += (mii_reg & 0x100)
4295                                                    ? DUPLEX_FULL :
4296                                                    DUPLEX_HALF;
4297                                         retval = e1000_set_spd_dplx(adapter,
4298                                                                     spddplx);
4299                                         if (retval)
4300                                                 return retval;
4301                                 }
4302                                 if (netif_running(adapter->netdev))
4303                                         e1000_reinit_locked(adapter);
4304                                 else
4305                                         e1000_reset(adapter);
4306                                 break;
4307                         case M88E1000_PHY_SPEC_CTRL:
4308                         case M88E1000_EXT_PHY_SPEC_CTRL:
4309                                 if (e1000_phy_reset(hw))
4310                                         return -EIO;
4311                                 break;
4312                         }
4313                 } else {
4314                         switch (data->reg_num) {
4315                         case PHY_CTRL:
4316                                 if (mii_reg & MII_CR_POWER_DOWN)
4317                                         break;
4318                                 if (netif_running(adapter->netdev))
4319                                         e1000_reinit_locked(adapter);
4320                                 else
4321                                         e1000_reset(adapter);
4322                                 break;
4323                         }
4324                 }
4325                 break;
4326         default:
4327                 return -EOPNOTSUPP;
4328         }
4329         return E1000_SUCCESS;
4330 }
4331
4332 void e1000_pci_set_mwi(struct e1000_hw *hw)
4333 {
4334         struct e1000_adapter *adapter = hw->back;
4335         int ret_val = pci_set_mwi(adapter->pdev);
4336
4337         if (ret_val)
4338                 DPRINTK(PROBE, ERR, "Error in setting MWI\n");
4339 }
4340
4341 void e1000_pci_clear_mwi(struct e1000_hw *hw)
4342 {
4343         struct e1000_adapter *adapter = hw->back;
4344
4345         pci_clear_mwi(adapter->pdev);
4346 }
4347
4348 int e1000_pcix_get_mmrbc(struct e1000_hw *hw)
4349 {
4350         struct e1000_adapter *adapter = hw->back;
4351         return pcix_get_mmrbc(adapter->pdev);
4352 }
4353
4354 void e1000_pcix_set_mmrbc(struct e1000_hw *hw, int mmrbc)
4355 {
4356         struct e1000_adapter *adapter = hw->back;
4357         pcix_set_mmrbc(adapter->pdev, mmrbc);
4358 }
4359
4360 void e1000_io_write(struct e1000_hw *hw, unsigned long port, u32 value)
4361 {
4362         outl(value, port);
4363 }
4364
4365 static void e1000_vlan_rx_register(struct net_device *netdev,
4366                                    struct vlan_group *grp)
4367 {
4368         struct e1000_adapter *adapter = netdev_priv(netdev);
4369         struct e1000_hw *hw = &adapter->hw;
4370         u32 ctrl, rctl;
4371
4372         if (!test_bit(__E1000_DOWN, &adapter->flags))
4373                 e1000_irq_disable(adapter);
4374         adapter->vlgrp = grp;
4375
4376         if (grp) {
4377                 /* enable VLAN tag insert/strip */
4378                 ctrl = er32(CTRL);
4379                 ctrl |= E1000_CTRL_VME;
4380                 ew32(CTRL, ctrl);
4381
4382                 /* enable VLAN receive filtering */
4383                 rctl = er32(RCTL);
4384                 rctl &= ~E1000_RCTL_CFIEN;
4385                 if (!(netdev->flags & IFF_PROMISC))
4386                         rctl |= E1000_RCTL_VFE;
4387                 ew32(RCTL, rctl);
4388                 e1000_update_mng_vlan(adapter);
4389         } else {
4390                 /* disable VLAN tag insert/strip */
4391                 ctrl = er32(CTRL);
4392                 ctrl &= ~E1000_CTRL_VME;
4393                 ew32(CTRL, ctrl);
4394
4395                 /* disable VLAN receive filtering */
4396                 rctl = er32(RCTL);
4397                 rctl &= ~E1000_RCTL_VFE;
4398                 ew32(RCTL, rctl);
4399
4400                 if (adapter->mng_vlan_id != (u16)E1000_MNG_VLAN_NONE) {
4401                         e1000_vlan_rx_kill_vid(netdev, adapter->mng_vlan_id);
4402                         adapter->mng_vlan_id = E1000_MNG_VLAN_NONE;
4403                 }
4404         }
4405
4406         if (!test_bit(__E1000_DOWN, &adapter->flags))
4407                 e1000_irq_enable(adapter);
4408 }
4409
4410 static void e1000_vlan_rx_add_vid(struct net_device *netdev, u16 vid)
4411 {
4412         struct e1000_adapter *adapter = netdev_priv(netdev);
4413         struct e1000_hw *hw = &adapter->hw;
4414         u32 vfta, index;
4415
4416         if ((hw->mng_cookie.status &
4417              E1000_MNG_DHCP_COOKIE_STATUS_VLAN_SUPPORT) &&
4418             (vid == adapter->mng_vlan_id))
4419                 return;
4420         /* add VID to filter table */
4421         index = (vid >> 5) & 0x7F;
4422         vfta = E1000_READ_REG_ARRAY(hw, VFTA, index);
4423         vfta |= (1 << (vid & 0x1F));
4424         e1000_write_vfta(hw, index, vfta);
4425 }
4426
4427 static void e1000_vlan_rx_kill_vid(struct net_device *netdev, u16 vid)
4428 {
4429         struct e1000_adapter *adapter = netdev_priv(netdev);
4430         struct e1000_hw *hw = &adapter->hw;
4431         u32 vfta, index;
4432
4433         if (!test_bit(__E1000_DOWN, &adapter->flags))
4434                 e1000_irq_disable(adapter);
4435         vlan_group_set_device(adapter->vlgrp, vid, NULL);
4436         if (!test_bit(__E1000_DOWN, &adapter->flags))
4437                 e1000_irq_enable(adapter);
4438
4439         /* remove VID from filter table */
4440         index = (vid >> 5) & 0x7F;
4441         vfta = E1000_READ_REG_ARRAY(hw, VFTA, index);
4442         vfta &= ~(1 << (vid & 0x1F));
4443         e1000_write_vfta(hw, index, vfta);
4444 }
4445
4446 static void e1000_restore_vlan(struct e1000_adapter *adapter)
4447 {
4448         e1000_vlan_rx_register(adapter->netdev, adapter->vlgrp);
4449
4450         if (adapter->vlgrp) {
4451                 u16 vid;
4452                 for (vid = 0; vid < VLAN_GROUP_ARRAY_LEN; vid++) {
4453                         if (!vlan_group_get_device(adapter->vlgrp, vid))
4454                                 continue;
4455                         e1000_vlan_rx_add_vid(adapter->netdev, vid);
4456                 }
4457         }
4458 }
4459
4460 int e1000_set_spd_dplx(struct e1000_adapter *adapter, u16 spddplx)
4461 {
4462         struct e1000_hw *hw = &adapter->hw;
4463
4464         hw->autoneg = 0;
4465
4466         /* Fiber NICs only allow 1000 gbps Full duplex */
4467         if ((hw->media_type == e1000_media_type_fiber) &&
4468                 spddplx != (SPEED_1000 + DUPLEX_FULL)) {
4469                 DPRINTK(PROBE, ERR, "Unsupported Speed/Duplex configuration\n");
4470                 return -EINVAL;
4471         }
4472
4473         switch (spddplx) {
4474         case SPEED_10 + DUPLEX_HALF:
4475                 hw->forced_speed_duplex = e1000_10_half;
4476                 break;
4477         case SPEED_10 + DUPLEX_FULL:
4478                 hw->forced_speed_duplex = e1000_10_full;
4479                 break;
4480         case SPEED_100 + DUPLEX_HALF:
4481                 hw->forced_speed_duplex = e1000_100_half;
4482                 break;
4483         case SPEED_100 + DUPLEX_FULL:
4484                 hw->forced_speed_duplex = e1000_100_full;
4485                 break;
4486         case SPEED_1000 + DUPLEX_FULL:
4487                 hw->autoneg = 1;
4488                 hw->autoneg_advertised = ADVERTISE_1000_FULL;
4489                 break;
4490         case SPEED_1000 + DUPLEX_HALF: /* not supported */
4491         default:
4492                 DPRINTK(PROBE, ERR, "Unsupported Speed/Duplex configuration\n");
4493                 return -EINVAL;
4494         }
4495         return 0;
4496 }
4497
4498 static int __e1000_shutdown(struct pci_dev *pdev, bool *enable_wake)
4499 {
4500         struct net_device *netdev = pci_get_drvdata(pdev);
4501         struct e1000_adapter *adapter = netdev_priv(netdev);
4502         struct e1000_hw *hw = &adapter->hw;
4503         u32 ctrl, ctrl_ext, rctl, status;
4504         u32 wufc = adapter->wol;
4505 #ifdef CONFIG_PM
4506         int retval = 0;
4507 #endif
4508
4509         netif_device_detach(netdev);
4510
4511         if (netif_running(netdev)) {
4512                 WARN_ON(test_bit(__E1000_RESETTING, &adapter->flags));
4513                 e1000_down(adapter);
4514         }
4515
4516 #ifdef CONFIG_PM
4517         retval = pci_save_state(pdev);
4518         if (retval)
4519                 return retval;
4520 #endif
4521
4522         status = er32(STATUS);
4523         if (status & E1000_STATUS_LU)
4524                 wufc &= ~E1000_WUFC_LNKC;
4525
4526         if (wufc) {
4527                 e1000_setup_rctl(adapter);
4528                 e1000_set_rx_mode(netdev);
4529
4530                 /* turn on all-multi mode if wake on multicast is enabled */
4531                 if (wufc & E1000_WUFC_MC) {
4532                         rctl = er32(RCTL);
4533                         rctl |= E1000_RCTL_MPE;
4534                         ew32(RCTL, rctl);
4535                 }
4536
4537                 if (hw->mac_type >= e1000_82540) {
4538                         ctrl = er32(CTRL);
4539                         /* advertise wake from D3Cold */
4540                         #define E1000_CTRL_ADVD3WUC 0x00100000
4541                         /* phy power management enable */
4542                         #define E1000_CTRL_EN_PHY_PWR_MGMT 0x00200000
4543                         ctrl |= E1000_CTRL_ADVD3WUC |
4544                                 E1000_CTRL_EN_PHY_PWR_MGMT;
4545                         ew32(CTRL, ctrl);
4546                 }
4547
4548                 if (hw->media_type == e1000_media_type_fiber ||
4549                     hw->media_type == e1000_media_type_internal_serdes) {
4550                         /* keep the laser running in D3 */
4551                         ctrl_ext = er32(CTRL_EXT);
4552                         ctrl_ext |= E1000_CTRL_EXT_SDP7_DATA;
4553                         ew32(CTRL_EXT, ctrl_ext);
4554                 }
4555
4556                 ew32(WUC, E1000_WUC_PME_EN);
4557                 ew32(WUFC, wufc);
4558         } else {
4559                 ew32(WUC, 0);
4560                 ew32(WUFC, 0);
4561         }
4562
4563         e1000_release_manageability(adapter);
4564
4565         *enable_wake = !!wufc;
4566
4567         /* make sure adapter isn't asleep if manageability is enabled */
4568         if (adapter->en_mng_pt)
4569                 *enable_wake = true;
4570
4571         if (netif_running(netdev))
4572                 e1000_free_irq(adapter);
4573
4574         pci_disable_device(pdev);
4575
4576         return 0;
4577 }
4578
4579 #ifdef CONFIG_PM
4580 static int e1000_suspend(struct pci_dev *pdev, pm_message_t state)
4581 {
4582         int retval;
4583         bool wake;
4584
4585         retval = __e1000_shutdown(pdev, &wake);
4586         if (retval)
4587                 return retval;
4588
4589         if (wake) {
4590                 pci_prepare_to_sleep(pdev);
4591         } else {
4592                 pci_wake_from_d3(pdev, false);
4593                 pci_set_power_state(pdev, PCI_D3hot);
4594         }
4595
4596         return 0;
4597 }
4598
4599 static int e1000_resume(struct pci_dev *pdev)
4600 {
4601         struct net_device *netdev = pci_get_drvdata(pdev);
4602         struct e1000_adapter *adapter = netdev_priv(netdev);
4603         struct e1000_hw *hw = &adapter->hw;
4604         u32 err;
4605
4606         pci_set_power_state(pdev, PCI_D0);
4607         pci_restore_state(pdev);
4608         pci_save_state(pdev);
4609
4610         if (adapter->need_ioport)
4611                 err = pci_enable_device(pdev);
4612         else
4613                 err = pci_enable_device_mem(pdev);
4614         if (err) {
4615                 printk(KERN_ERR "e1000: Cannot enable PCI device from suspend\n");
4616                 return err;
4617         }
4618         pci_set_master(pdev);
4619
4620         pci_enable_wake(pdev, PCI_D3hot, 0);
4621         pci_enable_wake(pdev, PCI_D3cold, 0);
4622
4623         if (netif_running(netdev)) {
4624                 err = e1000_request_irq(adapter);
4625                 if (err)
4626                         return err;
4627         }
4628
4629         e1000_power_up_phy(adapter);
4630         e1000_reset(adapter);
4631         ew32(WUS, ~0);
4632
4633         e1000_init_manageability(adapter);
4634
4635         if (netif_running(netdev))
4636                 e1000_up(adapter);
4637
4638         netif_device_attach(netdev);
4639
4640         return 0;
4641 }
4642 #endif
4643
4644 static void e1000_shutdown(struct pci_dev *pdev)
4645 {
4646         bool wake;
4647
4648         __e1000_shutdown(pdev, &wake);
4649
4650         if (system_state == SYSTEM_POWER_OFF) {
4651                 pci_wake_from_d3(pdev, wake);
4652                 pci_set_power_state(pdev, PCI_D3hot);
4653         }
4654 }
4655
4656 #ifdef CONFIG_NET_POLL_CONTROLLER
4657 /*
4658  * Polling 'interrupt' - used by things like netconsole to send skbs
4659  * without having to re-enable interrupts. It's not called while
4660  * the interrupt routine is executing.
4661  */
4662 static void e1000_netpoll(struct net_device *netdev)
4663 {
4664         struct e1000_adapter *adapter = netdev_priv(netdev);
4665
4666         disable_irq(adapter->pdev->irq);
4667         e1000_intr(adapter->pdev->irq, netdev);
4668         enable_irq(adapter->pdev->irq);
4669 }
4670 #endif
4671
4672 /**
4673  * e1000_io_error_detected - called when PCI error is detected
4674  * @pdev: Pointer to PCI device
4675  * @state: The current pci connection state
4676  *
4677  * This function is called after a PCI bus error affecting
4678  * this device has been detected.
4679  */
4680 static pci_ers_result_t e1000_io_error_detected(struct pci_dev *pdev,
4681                                                 pci_channel_state_t state)
4682 {
4683         struct net_device *netdev = pci_get_drvdata(pdev);
4684         struct e1000_adapter *adapter = netdev_priv(netdev);
4685
4686         netif_device_detach(netdev);
4687
4688         if (state == pci_channel_io_perm_failure)
4689                 return PCI_ERS_RESULT_DISCONNECT;
4690
4691         if (netif_running(netdev))
4692                 e1000_down(adapter);
4693         pci_disable_device(pdev);
4694
4695         /* Request a slot slot reset. */
4696         return PCI_ERS_RESULT_NEED_RESET;
4697 }
4698
4699 /**
4700  * e1000_io_slot_reset - called after the pci bus has been reset.
4701  * @pdev: Pointer to PCI device
4702  *
4703  * Restart the card from scratch, as if from a cold-boot. Implementation
4704  * resembles the first-half of the e1000_resume routine.
4705  */
4706 static pci_ers_result_t e1000_io_slot_reset(struct pci_dev *pdev)
4707 {
4708         struct net_device *netdev = pci_get_drvdata(pdev);
4709         struct e1000_adapter *adapter = netdev_priv(netdev);
4710         struct e1000_hw *hw = &adapter->hw;
4711         int err;
4712
4713         if (adapter->need_ioport)
4714                 err = pci_enable_device(pdev);
4715         else
4716                 err = pci_enable_device_mem(pdev);
4717         if (err) {
4718                 printk(KERN_ERR "e1000: Cannot re-enable PCI device after reset.\n");
4719                 return PCI_ERS_RESULT_DISCONNECT;
4720         }
4721         pci_set_master(pdev);
4722
4723         pci_enable_wake(pdev, PCI_D3hot, 0);
4724         pci_enable_wake(pdev, PCI_D3cold, 0);
4725
4726         e1000_reset(adapter);
4727         ew32(WUS, ~0);
4728
4729         return PCI_ERS_RESULT_RECOVERED;
4730 }
4731
4732 /**
4733  * e1000_io_resume - called when traffic can start flowing again.
4734  * @pdev: Pointer to PCI device
4735  *
4736  * This callback is called when the error recovery driver tells us that
4737  * its OK to resume normal operation. Implementation resembles the
4738  * second-half of the e1000_resume routine.
4739  */
4740 static void e1000_io_resume(struct pci_dev *pdev)
4741 {
4742         struct net_device *netdev = pci_get_drvdata(pdev);
4743         struct e1000_adapter *adapter = netdev_priv(netdev);
4744
4745         e1000_init_manageability(adapter);
4746
4747         if (netif_running(netdev)) {
4748                 if (e1000_up(adapter)) {
4749                         printk("e1000: can't bring device back up after reset\n");
4750                         return;
4751                 }
4752         }
4753
4754         netif_device_attach(netdev);
4755 }
4756
4757 /* e1000_main.c */