// SPDX-License-Identifier: GPL-2.0
/* Copyright(c) 1999 - 2006 Intel Corporation. */

#include "e1000.h"
#include <net/ip6_checksum.h>
#include <linux/io.h>
#include <linux/prefetch.h>
#include <linux/bitops.h>
#include <linux/if_vlan.h>

char e1000_driver_name[] = "e1000";
static char e1000_driver_string[] = "Intel(R) PRO/1000 Network Driver";
static const char e1000_copyright[] = "Copyright (c) 1999-2006 Intel Corporation.";

/* e1000_pci_tbl - PCI Device ID Table
 *
 * Last entry must be all 0s
 *
 * Macro expands to...
 *   {PCI_DEVICE(PCI_VENDOR_ID_INTEL, device_id)}
 */
static const struct pci_device_id e1000_pci_tbl[] = {
        INTEL_E1000_ETHERNET_DEVICE(0x1000),
        INTEL_E1000_ETHERNET_DEVICE(0x1001),
        INTEL_E1000_ETHERNET_DEVICE(0x1004),
        INTEL_E1000_ETHERNET_DEVICE(0x1008),
        INTEL_E1000_ETHERNET_DEVICE(0x1009),
        INTEL_E1000_ETHERNET_DEVICE(0x100C),
        INTEL_E1000_ETHERNET_DEVICE(0x100D),
        INTEL_E1000_ETHERNET_DEVICE(0x100E),
        INTEL_E1000_ETHERNET_DEVICE(0x100F),
        INTEL_E1000_ETHERNET_DEVICE(0x1010),
        INTEL_E1000_ETHERNET_DEVICE(0x1011),
        INTEL_E1000_ETHERNET_DEVICE(0x1012),
        INTEL_E1000_ETHERNET_DEVICE(0x1013),
        INTEL_E1000_ETHERNET_DEVICE(0x1014),
        INTEL_E1000_ETHERNET_DEVICE(0x1015),
        INTEL_E1000_ETHERNET_DEVICE(0x1016),
        INTEL_E1000_ETHERNET_DEVICE(0x1017),
        INTEL_E1000_ETHERNET_DEVICE(0x1018),
        INTEL_E1000_ETHERNET_DEVICE(0x1019),
        INTEL_E1000_ETHERNET_DEVICE(0x101A),
        INTEL_E1000_ETHERNET_DEVICE(0x101D),
        INTEL_E1000_ETHERNET_DEVICE(0x101E),
        INTEL_E1000_ETHERNET_DEVICE(0x1026),
        INTEL_E1000_ETHERNET_DEVICE(0x1027),
        INTEL_E1000_ETHERNET_DEVICE(0x1028),
        INTEL_E1000_ETHERNET_DEVICE(0x1075),
        INTEL_E1000_ETHERNET_DEVICE(0x1076),
        INTEL_E1000_ETHERNET_DEVICE(0x1077),
        INTEL_E1000_ETHERNET_DEVICE(0x1078),
        INTEL_E1000_ETHERNET_DEVICE(0x1079),
        INTEL_E1000_ETHERNET_DEVICE(0x107A),
        INTEL_E1000_ETHERNET_DEVICE(0x107B),
        INTEL_E1000_ETHERNET_DEVICE(0x107C),
        INTEL_E1000_ETHERNET_DEVICE(0x108A),
        INTEL_E1000_ETHERNET_DEVICE(0x1099),
        INTEL_E1000_ETHERNET_DEVICE(0x10B5),
        INTEL_E1000_ETHERNET_DEVICE(0x2E6E),
        /* required last entry */
        {0,}
};

MODULE_DEVICE_TABLE(pci, e1000_pci_tbl);

int e1000_up(struct e1000_adapter *adapter);
void e1000_down(struct e1000_adapter *adapter);
void e1000_reinit_locked(struct e1000_adapter *adapter);
void e1000_reset(struct e1000_adapter *adapter);
int e1000_setup_all_tx_resources(struct e1000_adapter *adapter);
int e1000_setup_all_rx_resources(struct e1000_adapter *adapter);
void e1000_free_all_tx_resources(struct e1000_adapter *adapter);
void e1000_free_all_rx_resources(struct e1000_adapter *adapter);
static int e1000_setup_tx_resources(struct e1000_adapter *adapter,
                                    struct e1000_tx_ring *txdr);
static int e1000_setup_rx_resources(struct e1000_adapter *adapter,
                                    struct e1000_rx_ring *rxdr);
static void e1000_free_tx_resources(struct e1000_adapter *adapter,
                                    struct e1000_tx_ring *tx_ring);
static void e1000_free_rx_resources(struct e1000_adapter *adapter,
                                    struct e1000_rx_ring *rx_ring);
void e1000_update_stats(struct e1000_adapter *adapter);

static int e1000_init_module(void);
static void e1000_exit_module(void);
static int e1000_probe(struct pci_dev *pdev, const struct pci_device_id *ent);
static void e1000_remove(struct pci_dev *pdev);
static int e1000_alloc_queues(struct e1000_adapter *adapter);
static int e1000_sw_init(struct e1000_adapter *adapter);
int e1000_open(struct net_device *netdev);
int e1000_close(struct net_device *netdev);
static void e1000_configure_tx(struct e1000_adapter *adapter);
static void e1000_configure_rx(struct e1000_adapter *adapter);
static void e1000_setup_rctl(struct e1000_adapter *adapter);
static void e1000_clean_all_tx_rings(struct e1000_adapter *adapter);
static void e1000_clean_all_rx_rings(struct e1000_adapter *adapter);
static void e1000_clean_tx_ring(struct e1000_adapter *adapter,
                                struct e1000_tx_ring *tx_ring);
static void e1000_clean_rx_ring(struct e1000_adapter *adapter,
                                struct e1000_rx_ring *rx_ring);
static void e1000_set_rx_mode(struct net_device *netdev);
static void e1000_update_phy_info_task(struct work_struct *work);
static void e1000_watchdog(struct work_struct *work);
static void e1000_82547_tx_fifo_stall_task(struct work_struct *work);
static netdev_tx_t e1000_xmit_frame(struct sk_buff *skb,
                                    struct net_device *netdev);
static int e1000_change_mtu(struct net_device *netdev, int new_mtu);
static int e1000_set_mac(struct net_device *netdev, void *p);
static irqreturn_t e1000_intr(int irq, void *data);
static bool e1000_clean_tx_irq(struct e1000_adapter *adapter,
                               struct e1000_tx_ring *tx_ring);
static int e1000_clean(struct napi_struct *napi, int budget);
static bool e1000_clean_rx_irq(struct e1000_adapter *adapter,
                               struct e1000_rx_ring *rx_ring,
                               int *work_done, int work_to_do);
static bool e1000_clean_jumbo_rx_irq(struct e1000_adapter *adapter,
                                     struct e1000_rx_ring *rx_ring,
                                     int *work_done, int work_to_do);
static void e1000_alloc_dummy_rx_buffers(struct e1000_adapter *adapter,
                                         struct e1000_rx_ring *rx_ring,
                                         int cleaned_count)
{
}
static void e1000_alloc_rx_buffers(struct e1000_adapter *adapter,
                                   struct e1000_rx_ring *rx_ring,
                                   int cleaned_count);
static void e1000_alloc_jumbo_rx_buffers(struct e1000_adapter *adapter,
                                         struct e1000_rx_ring *rx_ring,
                                         int cleaned_count);
static int e1000_ioctl(struct net_device *netdev, struct ifreq *ifr, int cmd);
static int e1000_mii_ioctl(struct net_device *netdev, struct ifreq *ifr,
                           int cmd);
static void e1000_enter_82542_rst(struct e1000_adapter *adapter);
static void e1000_leave_82542_rst(struct e1000_adapter *adapter);
static void e1000_tx_timeout(struct net_device *dev, unsigned int txqueue);
static void e1000_reset_task(struct work_struct *work);
static void e1000_smartspeed(struct e1000_adapter *adapter);
static int e1000_82547_fifo_workaround(struct e1000_adapter *adapter,
                                       struct sk_buff *skb);

static bool e1000_vlan_used(struct e1000_adapter *adapter);
static void e1000_vlan_mode(struct net_device *netdev,
                            netdev_features_t features);
static void e1000_vlan_filter_on_off(struct e1000_adapter *adapter,
                                     bool filter_on);
static int e1000_vlan_rx_add_vid(struct net_device *netdev,
                                 __be16 proto, u16 vid);
static int e1000_vlan_rx_kill_vid(struct net_device *netdev,
                                  __be16 proto, u16 vid);
static void e1000_restore_vlan(struct e1000_adapter *adapter);

static int e1000_suspend(struct device *dev);
static int e1000_resume(struct device *dev);
static void e1000_shutdown(struct pci_dev *pdev);

#ifdef CONFIG_NET_POLL_CONTROLLER
/* for netdump / net console */
static void e1000_netpoll (struct net_device *netdev);
#endif

#define COPYBREAK_DEFAULT 256
static unsigned int copybreak __read_mostly = COPYBREAK_DEFAULT;
module_param(copybreak, uint, 0644);
MODULE_PARM_DESC(copybreak,
        "Maximum size of packet that is copied to a new buffer on receive");

static pci_ers_result_t e1000_io_error_detected(struct pci_dev *pdev,
                                                pci_channel_state_t state);
static pci_ers_result_t e1000_io_slot_reset(struct pci_dev *pdev);
static void e1000_io_resume(struct pci_dev *pdev);

static const struct pci_error_handlers e1000_err_handler = {
        .error_detected = e1000_io_error_detected,
        .slot_reset = e1000_io_slot_reset,
        .resume = e1000_io_resume,
};

static DEFINE_SIMPLE_DEV_PM_OPS(e1000_pm_ops, e1000_suspend, e1000_resume);

static struct pci_driver e1000_driver = {
        .name     = e1000_driver_name,
        .id_table = e1000_pci_tbl,
        .probe    = e1000_probe,
        .remove   = e1000_remove,
        .driver.pm = pm_sleep_ptr(&e1000_pm_ops),
        .shutdown = e1000_shutdown,
        .err_handler = &e1000_err_handler
};

MODULE_DESCRIPTION("Intel(R) PRO/1000 Network Driver");
MODULE_LICENSE("GPL v2");

#define DEFAULT_MSG_ENABLE (NETIF_MSG_DRV|NETIF_MSG_PROBE|NETIF_MSG_LINK)
static int debug = -1;
module_param(debug, int, 0);
MODULE_PARM_DESC(debug, "Debug level (0=none,...,16=all)");

/**
 * e1000_get_hw_dev - helper function for getting netdev
 * @hw: pointer to HW struct
 *
 * return device used by hardware layer to print debugging information
 *
 **/
struct net_device *e1000_get_hw_dev(struct e1000_hw *hw)
{
        struct e1000_adapter *adapter = hw->back;
        return adapter->netdev;
}

/**
 * e1000_init_module - Driver Registration Routine
 *
 * e1000_init_module is the first routine called when the driver is
 * loaded. All it does is register with the PCI subsystem.
 **/
static int __init e1000_init_module(void)
{
        int ret;
        pr_info("%s\n", e1000_driver_string);

        pr_info("%s\n", e1000_copyright);

        ret = pci_register_driver(&e1000_driver);
        if (copybreak != COPYBREAK_DEFAULT) {
                if (copybreak == 0)
                        pr_info("copybreak disabled\n");
                else
                        pr_info("copybreak enabled for "
                                   "packets <= %u bytes\n", copybreak);
        }
        return ret;
}

module_init(e1000_init_module);

/**
 * e1000_exit_module - Driver Exit Cleanup Routine
 *
 * e1000_exit_module is called just before the driver is removed
 * from memory.
 **/
static void __exit e1000_exit_module(void)
{
        pci_unregister_driver(&e1000_driver);
}

module_exit(e1000_exit_module);

static int e1000_request_irq(struct e1000_adapter *adapter)
{
        struct net_device *netdev = adapter->netdev;
        irq_handler_t handler = e1000_intr;
        int irq_flags = IRQF_SHARED;
        int err;

        err = request_irq(adapter->pdev->irq, handler, irq_flags, netdev->name,
                          netdev);
        if (err) {
                e_err(probe, "Unable to allocate interrupt Error: %d\n", err);
        }

        return err;
}

static void e1000_free_irq(struct e1000_adapter *adapter)
{
        struct net_device *netdev = adapter->netdev;

        free_irq(adapter->pdev->irq, netdev);
}

/**
 * e1000_irq_disable - Mask off interrupt generation on the NIC
 * @adapter: board private structure
 **/
static void e1000_irq_disable(struct e1000_adapter *adapter)
{
        struct e1000_hw *hw = &adapter->hw;

        ew32(IMC, ~0);
        E1000_WRITE_FLUSH();
        synchronize_irq(adapter->pdev->irq);
}

/**
 * e1000_irq_enable - Enable default interrupt generation settings
 * @adapter: board private structure
 **/
static void e1000_irq_enable(struct e1000_adapter *adapter)
{
        struct e1000_hw *hw = &adapter->hw;

        ew32(IMS, IMS_ENABLE_MASK);
        E1000_WRITE_FLUSH();
}

static void e1000_update_mng_vlan(struct e1000_adapter *adapter)
{
        struct e1000_hw *hw = &adapter->hw;
        struct net_device *netdev = adapter->netdev;
        u16 vid = hw->mng_cookie.vlan_id;
        u16 old_vid = adapter->mng_vlan_id;

        if (!e1000_vlan_used(adapter))
                return;

        if (!test_bit(vid, adapter->active_vlans)) {
                if (hw->mng_cookie.status &
                    E1000_MNG_DHCP_COOKIE_STATUS_VLAN_SUPPORT) {
                        e1000_vlan_rx_add_vid(netdev, htons(ETH_P_8021Q), vid);
                        adapter->mng_vlan_id = vid;
                } else {
                        adapter->mng_vlan_id = E1000_MNG_VLAN_NONE;
                }
                if (old_vid != E1000_MNG_VLAN_NONE && vid != old_vid &&
                    !test_bit(old_vid, adapter->active_vlans))
                        e1000_vlan_rx_kill_vid(netdev, htons(ETH_P_8021Q),
                                               old_vid);
        } else {
                adapter->mng_vlan_id = vid;
        }
}

static void e1000_init_manageability(struct e1000_adapter *adapter)
{
        struct e1000_hw *hw = &adapter->hw;

        if (adapter->en_mng_pt) {
                u32 manc = er32(MANC);

                /* disable hardware interception of ARP */
                manc &= ~(E1000_MANC_ARP_EN);

                ew32(MANC, manc);
        }
}

static void e1000_release_manageability(struct e1000_adapter *adapter)
{
        struct e1000_hw *hw = &adapter->hw;

        if (adapter->en_mng_pt) {
                u32 manc = er32(MANC);

                /* re-enable hardware interception of ARP */
                manc |= E1000_MANC_ARP_EN;

                ew32(MANC, manc);
        }
}

/**
 * e1000_configure - configure the hardware for RX and TX
 * @adapter: private board structure
 **/
static void e1000_configure(struct e1000_adapter *adapter)
{
        struct net_device *netdev = adapter->netdev;
        int i;

        e1000_set_rx_mode(netdev);

        e1000_restore_vlan(adapter);
        e1000_init_manageability(adapter);

        e1000_configure_tx(adapter);
        e1000_setup_rctl(adapter);
        e1000_configure_rx(adapter);
        /* call E1000_DESC_UNUSED which always leaves
         * at least 1 descriptor unused to make sure
         * next_to_use != next_to_clean
         */
        for (i = 0; i < adapter->num_rx_queues; i++) {
                struct e1000_rx_ring *ring = &adapter->rx_ring[i];
                adapter->alloc_rx_buf(adapter, ring,
                                      E1000_DESC_UNUSED(ring));
        }
}

int e1000_up(struct e1000_adapter *adapter)
{
        struct e1000_hw *hw = &adapter->hw;

        /* hardware has been reset, we need to reload some things */
        e1000_configure(adapter);

        clear_bit(__E1000_DOWN, &adapter->flags);

        napi_enable(&adapter->napi);

        e1000_irq_enable(adapter);

        netif_wake_queue(adapter->netdev);

        /* fire a link change interrupt to start the watchdog */
        ew32(ICS, E1000_ICS_LSC);
        return 0;
}

/**
 * e1000_power_up_phy - restore link in case the phy was powered down
 * @adapter: address of board private structure
 *
 * The phy may be powered down to save power and turn off link when the
 * driver is unloaded and wake on lan is not enabled (among others)
 * *** this routine MUST be followed by a call to e1000_reset ***
 **/
void e1000_power_up_phy(struct e1000_adapter *adapter)
{
        struct e1000_hw *hw = &adapter->hw;
        u16 mii_reg = 0;

        /* Just clear the power down bit to wake the phy back up */
        if (hw->media_type == e1000_media_type_copper) {
                /* according to the manual, the phy will retain its
                 * settings across a power-down/up cycle
                 */
                e1000_read_phy_reg(hw, PHY_CTRL, &mii_reg);
                mii_reg &= ~MII_CR_POWER_DOWN;
                e1000_write_phy_reg(hw, PHY_CTRL, mii_reg);
        }
}

static void e1000_power_down_phy(struct e1000_adapter *adapter)
{
        struct e1000_hw *hw = &adapter->hw;

        /* Power down the PHY so no link is implied when interface is down *
         * The PHY cannot be powered down if any of the following is true *
         * (a) WoL is enabled
         * (b) AMT is active
         * (c) SoL/IDER session is active
         */
        if (!adapter->wol && hw->mac_type >= e1000_82540 &&
           hw->media_type == e1000_media_type_copper) {
                u16 mii_reg = 0;

                switch (hw->mac_type) {
                case e1000_82540:
                case e1000_82545:
                case e1000_82545_rev_3:
                case e1000_82546:
                case e1000_ce4100:
                case e1000_82546_rev_3:
                case e1000_82541:
                case e1000_82541_rev_2:
                case e1000_82547:
                case e1000_82547_rev_2:
                        if (er32(MANC) & E1000_MANC_SMBUS_EN)
                                goto out;
                        break;
                default:
                        goto out;
                }
                e1000_read_phy_reg(hw, PHY_CTRL, &mii_reg);
                mii_reg |= MII_CR_POWER_DOWN;
                e1000_write_phy_reg(hw, PHY_CTRL, mii_reg);
                msleep(1);
        }
out:
        return;
}

static void e1000_down_and_stop(struct e1000_adapter *adapter)
{
        set_bit(__E1000_DOWN, &adapter->flags);

        cancel_delayed_work_sync(&adapter->watchdog_task);

        /*
         * Since the watchdog task can reschedule other tasks, we should cancel
         * it first, otherwise we can run into the situation when a work is
         * still running after the adapter has been turned down.
         */

        cancel_delayed_work_sync(&adapter->phy_info_task);
        cancel_delayed_work_sync(&adapter->fifo_stall_task);
}

void e1000_down(struct e1000_adapter *adapter)
{
        struct e1000_hw *hw = &adapter->hw;
        struct net_device *netdev = adapter->netdev;
        u32 rctl, tctl;

        /* disable receives in the hardware */
        rctl = er32(RCTL);
        ew32(RCTL, rctl & ~E1000_RCTL_EN);
        /* flush and sleep below */

        netif_tx_disable(netdev);

        /* disable transmits in the hardware */
        tctl = er32(TCTL);
        tctl &= ~E1000_TCTL_EN;
        ew32(TCTL, tctl);
        /* flush both disables and wait for them to finish */
        E1000_WRITE_FLUSH();
        msleep(10);

        /* Set the carrier off after transmits have been disabled in the
         * hardware, to avoid race conditions with e1000_watchdog() (which
         * may be running concurrently to us, checking for the carrier
         * bit to decide whether it should enable transmits again). Such
         * a race condition would result into transmission being disabled
         * in the hardware until the next IFF_DOWN+IFF_UP cycle.
         */
        netif_carrier_off(netdev);

        netif_queue_set_napi(netdev, 0, NETDEV_QUEUE_TYPE_RX, NULL);
        netif_queue_set_napi(netdev, 0, NETDEV_QUEUE_TYPE_TX, NULL);
        napi_disable(&adapter->napi);

        e1000_irq_disable(adapter);

        /* Setting DOWN must be after irq_disable to prevent
         * a screaming interrupt.  Setting DOWN also prevents
         * tasks from rescheduling.
         */
        e1000_down_and_stop(adapter);

        adapter->link_speed = 0;
        adapter->link_duplex = 0;

        e1000_reset(adapter);
        e1000_clean_all_tx_rings(adapter);
        e1000_clean_all_rx_rings(adapter);
}

void e1000_reinit_locked(struct e1000_adapter *adapter)
{
        while (test_and_set_bit(__E1000_RESETTING, &adapter->flags))
                msleep(1);

        /* only run the task if not already down */
        if (!test_bit(__E1000_DOWN, &adapter->flags)) {
                e1000_down(adapter);
                e1000_up(adapter);
        }

        clear_bit(__E1000_RESETTING, &adapter->flags);
}

void e1000_reset(struct e1000_adapter *adapter)
{
        struct e1000_hw *hw = &adapter->hw;
        u32 pba = 0, tx_space, min_tx_space, min_rx_space;
        bool legacy_pba_adjust = false;
        u16 hwm;

        /* Repartition Pba for greater than 9k mtu
         * To take effect CTRL.RST is required.
         */

        switch (hw->mac_type) {
        case e1000_82542_rev2_0:
        case e1000_82542_rev2_1:
        case e1000_82543:
        case e1000_82544:
        case e1000_82540:
        case e1000_82541:
        case e1000_82541_rev_2:
                legacy_pba_adjust = true;
                pba = E1000_PBA_48K;
                break;
        case e1000_82545:
        case e1000_82545_rev_3:
        case e1000_82546:
        case e1000_ce4100:
        case e1000_82546_rev_3:
                pba = E1000_PBA_48K;
                break;
        case e1000_82547:
        case e1000_82547_rev_2:
                legacy_pba_adjust = true;
                pba = E1000_PBA_30K;
                break;
        case e1000_undefined:
        case e1000_num_macs:
                break;
        }

        if (legacy_pba_adjust) {
                if (hw->max_frame_size > E1000_RXBUFFER_8192)
                        pba -= 8; /* allocate more FIFO for Tx */

                if (hw->mac_type == e1000_82547) {
                        adapter->tx_fifo_head = 0;
                        adapter->tx_head_addr = pba << E1000_TX_HEAD_ADDR_SHIFT;
                        adapter->tx_fifo_size =
                                (E1000_PBA_40K - pba) << E1000_PBA_BYTES_SHIFT;
                        atomic_set(&adapter->tx_fifo_stall, 0);
                }
        } else if (hw->max_frame_size >  ETH_FRAME_LEN + ETH_FCS_LEN) {
                /* adjust PBA for jumbo frames */
                ew32(PBA, pba);

                /* To maintain wire speed transmits, the Tx FIFO should be
                 * large enough to accommodate two full transmit packets,
                 * rounded up to the next 1KB and expressed in KB.  Likewise,
                 * the Rx FIFO should be large enough to accommodate at least
                 * one full receive packet and is similarly rounded up and
                 * expressed in KB.
                 */
                pba = er32(PBA);
                /* upper 16 bits has Tx packet buffer allocation size in KB */
                tx_space = pba >> 16;
                /* lower 16 bits has Rx packet buffer allocation size in KB */
                pba &= 0xffff;
                /* the Tx fifo also stores 16 bytes of information about the Tx
                 * but don't include ethernet FCS because hardware appends it
                 */
                min_tx_space = (hw->max_frame_size +
                                sizeof(struct e1000_tx_desc) -
                                ETH_FCS_LEN) * 2;
                min_tx_space = ALIGN(min_tx_space, 1024);
                min_tx_space >>= 10;
                /* software strips receive CRC, so leave room for it */
                min_rx_space = hw->max_frame_size;
                min_rx_space = ALIGN(min_rx_space, 1024);
                min_rx_space >>= 10;

                /* If current Tx allocation is less than the min Tx FIFO size,
                 * and the min Tx FIFO size is less than the current Rx FIFO
                 * allocation, take space away from current Rx allocation
                 */
                if (tx_space < min_tx_space &&
                    ((min_tx_space - tx_space) < pba)) {
                        pba = pba - (min_tx_space - tx_space);

                        /* PCI/PCIx hardware has PBA alignment constraints */
                        switch (hw->mac_type) {
                        case e1000_82545 ... e1000_82546_rev_3:
                                pba &= ~(E1000_PBA_8K - 1);
                                break;
                        default:
                                break;
                        }

                        /* if short on Rx space, Rx wins and must trump Tx
                         * adjustment or use Early Receive if available
                         */
                        if (pba < min_rx_space)
                                pba = min_rx_space;
                }
        }

        ew32(PBA, pba);

        /* flow control settings:
         * The high water mark must be low enough to fit one full frame
         * (or the size used for early receive) above it in the Rx FIFO.
         * Set it to the lower of:
         * - 90% of the Rx FIFO size, and
         * - the full Rx FIFO size minus the early receive size (for parts
         *   with ERT support assuming ERT set to E1000_ERT_2048), or
         * - the full Rx FIFO size minus one full frame
         */
        hwm = min(((pba << 10) * 9 / 10),
                  ((pba << 10) - hw->max_frame_size));

        hw->fc_high_water = hwm & 0xFFF8;       /* 8-byte granularity */
        hw->fc_low_water = hw->fc_high_water - 8;
        hw->fc_pause_time = E1000_FC_PAUSE_TIME;
        hw->fc_send_xon = 1;
        hw->fc = hw->original_fc;

        /* Allow time for pending master requests to run */
        e1000_reset_hw(hw);
        if (hw->mac_type >= e1000_82544)
                ew32(WUC, 0);

        if (e1000_init_hw(hw))
                e_dev_err("Hardware Error\n");
        e1000_update_mng_vlan(adapter);

        /* if (adapter->hwflags & HWFLAGS_PHY_PWR_BIT) { */
        if (hw->mac_type >= e1000_82544 &&
            hw->autoneg == 1 &&
            hw->autoneg_advertised == ADVERTISE_1000_FULL) {
                u32 ctrl = er32(CTRL);
                /* clear phy power management bit if we are in gig only mode,
                 * which if enabled will attempt negotiation to 100Mb, which
                 * can cause a loss of link at power off or driver unload
                 */
                ctrl &= ~E1000_CTRL_SWDPIN3;
                ew32(CTRL, ctrl);
        }

        /* Enable h/w to recognize an 802.1Q VLAN Ethernet packet */
        ew32(VET, ETHERNET_IEEE_VLAN_TYPE);

        e1000_reset_adaptive(hw);
        e1000_phy_get_info(hw, &adapter->phy_info);

        e1000_release_manageability(adapter);
}

/* Dump the eeprom for users having checksum issues */
static void e1000_dump_eeprom(struct e1000_adapter *adapter)
{
        struct net_device *netdev = adapter->netdev;
        struct ethtool_eeprom eeprom;
        const struct ethtool_ops *ops = netdev->ethtool_ops;
        u8 *data;
        int i;
        u16 csum_old, csum_new = 0;

        eeprom.len = ops->get_eeprom_len(netdev);
        eeprom.offset = 0;

        data = kmalloc(eeprom.len, GFP_KERNEL);
        if (!data)
                return;

        ops->get_eeprom(netdev, &eeprom, data);

        csum_old = (data[EEPROM_CHECKSUM_REG * 2]) +
                   (data[EEPROM_CHECKSUM_REG * 2 + 1] << 8);
        for (i = 0; i < EEPROM_CHECKSUM_REG * 2; i += 2)
                csum_new += data[i] + (data[i + 1] << 8);
        csum_new = EEPROM_SUM - csum_new;

        pr_err("/*********************/\n");
        pr_err("Current EEPROM Checksum : 0x%04x\n", csum_old);
        pr_err("Calculated              : 0x%04x\n", csum_new);

        pr_err("Offset    Values\n");
        pr_err("========  ======\n");
        print_hex_dump(KERN_ERR, "", DUMP_PREFIX_OFFSET, 16, 1, data, 128, 0);

        pr_err("Include this output when contacting your support provider.\n");
        pr_err("This is not a software error! Something bad happened to\n");
        pr_err("your hardware or EEPROM image. Ignoring this problem could\n");
        pr_err("result in further problems, possibly loss of data,\n");
        pr_err("corruption or system hangs!\n");
        pr_err("The MAC Address will be reset to 00:00:00:00:00:00,\n");
        pr_err("which is invalid and requires you to set the proper MAC\n");
        pr_err("address manually before continuing to enable this network\n");
        pr_err("device. Please inspect the EEPROM dump and report the\n");
        pr_err("issue to your hardware vendor or Intel Customer Support.\n");
        pr_err("/*********************/\n");

        kfree(data);
}

/**
 * e1000_is_need_ioport - determine if an adapter needs ioport resources or not
 * @pdev: PCI device information struct
 *
 * Return true if an adapter needs ioport resources
 **/
static int e1000_is_need_ioport(struct pci_dev *pdev)
{
        switch (pdev->device) {
        case E1000_DEV_ID_82540EM:
        case E1000_DEV_ID_82540EM_LOM:
        case E1000_DEV_ID_82540EP:
        case E1000_DEV_ID_82540EP_LOM:
        case E1000_DEV_ID_82540EP_LP:
        case E1000_DEV_ID_82541EI:
        case E1000_DEV_ID_82541EI_MOBILE:
        case E1000_DEV_ID_82541ER:
        case E1000_DEV_ID_82541ER_LOM:
        case E1000_DEV_ID_82541GI:
        case E1000_DEV_ID_82541GI_LF:
        case E1000_DEV_ID_82541GI_MOBILE:
        case E1000_DEV_ID_82544EI_COPPER:
        case E1000_DEV_ID_82544EI_FIBER:
        case E1000_DEV_ID_82544GC_COPPER:
        case E1000_DEV_ID_82544GC_LOM:
        case E1000_DEV_ID_82545EM_COPPER:
        case E1000_DEV_ID_82545EM_FIBER:
        case E1000_DEV_ID_82546EB_COPPER:
        case E1000_DEV_ID_82546EB_FIBER:
        case E1000_DEV_ID_82546EB_QUAD_COPPER:
                return true;
        default:
                return false;
        }
}

static netdev_features_t e1000_fix_features(struct net_device *netdev,
        netdev_features_t features)
{
        /* Since there is no support for separate Rx/Tx vlan accel
         * enable/disable make sure Tx flag is always in same state as Rx.
         */
        if (features & NETIF_F_HW_VLAN_CTAG_RX)
                features |= NETIF_F_HW_VLAN_CTAG_TX;
        else
                features &= ~NETIF_F_HW_VLAN_CTAG_TX;

        return features;
}

static int e1000_set_features(struct net_device *netdev,
        netdev_features_t features)
{
        struct e1000_adapter *adapter = netdev_priv(netdev);
        netdev_features_t changed = features ^ netdev->features;

        if (changed & NETIF_F_HW_VLAN_CTAG_RX)
                e1000_vlan_mode(netdev, features);

        if (!(changed & (NETIF_F_RXCSUM | NETIF_F_RXALL)))
                return 0;

        netdev->features = features;
        adapter->rx_csum = !!(features & NETIF_F_RXCSUM);

        if (netif_running(netdev))
                e1000_reinit_locked(adapter);
        else
                e1000_reset(adapter);

        return 1;
}

static const struct net_device_ops e1000_netdev_ops = {
        .ndo_open               = e1000_open,
        .ndo_stop               = e1000_close,
        .ndo_start_xmit         = e1000_xmit_frame,
        .ndo_set_rx_mode        = e1000_set_rx_mode,
        .ndo_set_mac_address    = e1000_set_mac,
        .ndo_tx_timeout         = e1000_tx_timeout,
        .ndo_change_mtu         = e1000_change_mtu,
        .ndo_eth_ioctl          = e1000_ioctl,
        .ndo_validate_addr      = eth_validate_addr,
        .ndo_vlan_rx_add_vid    = e1000_vlan_rx_add_vid,
        .ndo_vlan_rx_kill_vid   = e1000_vlan_rx_kill_vid,
#ifdef CONFIG_NET_POLL_CONTROLLER
        .ndo_poll_controller    = e1000_netpoll,
#endif
        .ndo_fix_features       = e1000_fix_features,
        .ndo_set_features       = e1000_set_features,
};

/**
 * e1000_init_hw_struct - initialize members of hw struct
 * @adapter: board private struct
 * @hw: structure used by e1000_hw.c
 *
 * Factors out initialization of the e1000_hw struct to its own function
 * that can be called very early at init (just after struct allocation).
 * Fields are initialized based on PCI device information and
 * OS network device settings (MTU size).
 * Returns negative error codes if MAC type setup fails.
 */
static int e1000_init_hw_struct(struct e1000_adapter *adapter,
                                struct e1000_hw *hw)
{
        struct pci_dev *pdev = adapter->pdev;

        /* PCI config space info */
        hw->vendor_id = pdev->vendor;
        hw->device_id = pdev->device;
        hw->subsystem_vendor_id = pdev->subsystem_vendor;
        hw->subsystem_id = pdev->subsystem_device;
        hw->revision_id = pdev->revision;

        pci_read_config_word(pdev, PCI_COMMAND, &hw->pci_cmd_word);

        hw->max_frame_size = adapter->netdev->mtu +
                             ENET_HEADER_SIZE + ETHERNET_FCS_SIZE;
        hw->min_frame_size = MINIMUM_ETHERNET_FRAME_SIZE;

        /* identify the MAC */
        if (e1000_set_mac_type(hw)) {
                e_err(probe, "Unknown MAC Type\n");
                return -EIO;
        }

        switch (hw->mac_type) {
        default:
                break;
        case e1000_82541:
        case e1000_82547:
        case e1000_82541_rev_2:
        case e1000_82547_rev_2:
                hw->phy_init_script = 1;
                break;
        }

        e1000_set_media_type(hw);
        e1000_get_bus_info(hw);

        hw->wait_autoneg_complete = false;
        hw->tbi_compatibility_en = true;
        hw->adaptive_ifs = true;

        /* Copper options */

        if (hw->media_type == e1000_media_type_copper) {
                hw->mdix = AUTO_ALL_MODES;
                hw->disable_polarity_correction = false;
                hw->master_slave = E1000_MASTER_SLAVE;
        }

        return 0;
}

/**
 * e1000_probe - Device Initialization Routine
 * @pdev: PCI device information struct
 * @ent: entry in e1000_pci_tbl
 *
 * Returns 0 on success, negative on failure
 *
 * e1000_probe initializes an adapter identified by a pci_dev structure.
 * The OS initialization, configuring of the adapter private structure,
 * and a hardware reset occur.
 **/
static int e1000_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
{
        struct net_device *netdev;
        struct e1000_adapter *adapter = NULL;
        struct e1000_hw *hw;

        static int cards_found;
        static int global_quad_port_a; /* global ksp3 port a indication */
        int i, err, pci_using_dac;
        u16 eeprom_data = 0;
        u16 tmp = 0;
        u16 eeprom_apme_mask = E1000_EEPROM_APME;
        int bars, need_ioport;
        bool disable_dev = false;

        /* do not allocate ioport bars when not needed */
        need_ioport = e1000_is_need_ioport(pdev);
        if (need_ioport) {
                bars = pci_select_bars(pdev, IORESOURCE_MEM | IORESOURCE_IO);
                err = pci_enable_device(pdev);
        } else {
                bars = pci_select_bars(pdev, IORESOURCE_MEM);
                err = pci_enable_device_mem(pdev);
        }
        if (err)
                return err;

        err = pci_request_selected_regions(pdev, bars, e1000_driver_name);
        if (err)
                goto err_pci_reg;

        pci_set_master(pdev);
        err = pci_save_state(pdev);
        if (err)
                goto err_alloc_etherdev;

        err = -ENOMEM;
        netdev = alloc_etherdev(sizeof(struct e1000_adapter));
        if (!netdev)
                goto err_alloc_etherdev;

        SET_NETDEV_DEV(netdev, &pdev->dev);

        pci_set_drvdata(pdev, netdev);
        adapter = netdev_priv(netdev);
        adapter->netdev = netdev;
        adapter->pdev = pdev;
        adapter->msg_enable = netif_msg_init(debug, DEFAULT_MSG_ENABLE);
        adapter->bars = bars;
        adapter->need_ioport = need_ioport;

        hw = &adapter->hw;
        hw->back = adapter;

        err = -EIO;
        hw->hw_addr = pci_ioremap_bar(pdev, BAR_0);
        if (!hw->hw_addr)
                goto err_ioremap;

        if (adapter->need_ioport) {
                for (i = BAR_1; i < PCI_STD_NUM_BARS; i++) {
                        if (pci_resource_len(pdev, i) == 0)
                                continue;
                        if (pci_resource_flags(pdev, i) & IORESOURCE_IO) {
                                hw->io_base = pci_resource_start(pdev, i);
                                break;
                        }
                }
        }

        /* make ready for any if (hw->...) below */
        err = e1000_init_hw_struct(adapter, hw);
        if (err)
                goto err_sw_init;

        /* there is a workaround being applied below that limits
         * 64-bit DMA addresses to 64-bit hardware.  There are some
         * 32-bit adapters that Tx hang when given 64-bit DMA addresses
         */
        pci_using_dac = 0;
        if ((hw->bus_type == e1000_bus_type_pcix) &&
            !dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(64))) {
                pci_using_dac = 1;
        } else {
                err = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32));
                if (err) {
                        pr_err("No usable DMA config, aborting\n");
                        goto err_dma;
                }
        }

        netdev->netdev_ops = &e1000_netdev_ops;
        e1000_set_ethtool_ops(netdev);
        netdev->watchdog_timeo = 5 * HZ;
        netif_napi_add(netdev, &adapter->napi, e1000_clean);

        strscpy(netdev->name, pci_name(pdev), sizeof(netdev->name));

        adapter->bd_number = cards_found;

        /* setup the private structure */

        err = e1000_sw_init(adapter);
        if (err)
                goto err_sw_init;

        err = -EIO;
        if (hw->mac_type == e1000_ce4100) {
                hw->ce4100_gbe_mdio_base_virt =
                                        ioremap(pci_resource_start(pdev, BAR_1),
                                                pci_resource_len(pdev, BAR_1));

                if (!hw->ce4100_gbe_mdio_base_virt)
                        goto err_mdio_ioremap;
        }

        if (hw->mac_type >= e1000_82543) {
                netdev->hw_features = NETIF_F_SG |
                                   NETIF_F_HW_CSUM |
                                   NETIF_F_HW_VLAN_CTAG_RX;
                netdev->features = NETIF_F_HW_VLAN_CTAG_TX |
                                   NETIF_F_HW_VLAN_CTAG_FILTER;
        }

        if ((hw->mac_type >= e1000_82544) &&
           (hw->mac_type != e1000_82547))
                netdev->hw_features |= NETIF_F_TSO;

        netdev->priv_flags |= IFF_SUPP_NOFCS;

        netdev->features |= netdev->hw_features;
        netdev->hw_features |= (NETIF_F_RXCSUM |
                                NETIF_F_RXALL |
                                NETIF_F_RXFCS);

        if (pci_using_dac) {
                netdev->features |= NETIF_F_HIGHDMA;
                netdev->vlan_features |= NETIF_F_HIGHDMA;
        }

        netdev->vlan_features |= (NETIF_F_TSO |
                                  NETIF_F_HW_CSUM |
                                  NETIF_F_SG);

        /* Do not set IFF_UNICAST_FLT for VMWare's 82545EM */
        if (hw->device_id != E1000_DEV_ID_82545EM_COPPER ||
            hw->subsystem_vendor_id != PCI_VENDOR_ID_VMWARE)
                netdev->priv_flags |= IFF_UNICAST_FLT;

        /* MTU range: 46 - 16110 */
        netdev->min_mtu = ETH_ZLEN - ETH_HLEN;
        netdev->max_mtu = MAX_JUMBO_FRAME_SIZE - (ETH_HLEN + ETH_FCS_LEN);

        adapter->en_mng_pt = e1000_enable_mng_pass_thru(hw);

        /* initialize eeprom parameters */
        if (e1000_init_eeprom_params(hw)) {
                e_err(probe, "EEPROM initialization failed\n");
                goto err_eeprom;
        }

        /* before reading the EEPROM, reset the controller to
         * put the device in a known good starting state
         */

        e1000_reset_hw(hw);

        /* make sure the EEPROM is good */
        if (e1000_validate_eeprom_checksum(hw) < 0) {
                e_err(probe, "The EEPROM Checksum Is Not Valid\n");
                e1000_dump_eeprom(adapter);
                /* set MAC address to all zeroes to invalidate and temporary
                 * disable this device for the user. This blocks regular
                 * traffic while still permitting ethtool ioctls from reaching
                 * the hardware as well as allowing the user to run the
                 * interface after manually setting a hw addr using
                 * `ip set address`
                 */
                memset(hw->mac_addr, 0, netdev->addr_len);
        } else {
                /* copy the MAC address out of the EEPROM */
                if (e1000_read_mac_addr(hw))
                        e_err(probe, "EEPROM Read Error\n");
        }
        /* don't block initialization here due to bad MAC address */
        eth_hw_addr_set(netdev, hw->mac_addr);

        if (!is_valid_ether_addr(netdev->dev_addr))
                e_err(probe, "Invalid MAC Address\n");


        INIT_DELAYED_WORK(&adapter->watchdog_task, e1000_watchdog);
        INIT_DELAYED_WORK(&adapter->fifo_stall_task,
                          e1000_82547_tx_fifo_stall_task);
        INIT_DELAYED_WORK(&adapter->phy_info_task, e1000_update_phy_info_task);
        INIT_WORK(&adapter->reset_task, e1000_reset_task);

        e1000_check_options(adapter);

        /* Initial Wake on LAN setting
         * If APM wake is enabled in the EEPROM,
         * enable the ACPI Magic Packet filter
         */

        switch (hw->mac_type) {
        case e1000_82542_rev2_0:
        case e1000_82542_rev2_1:
        case e1000_82543:
                break;
        case e1000_82544:
                e1000_read_eeprom(hw,
                        EEPROM_INIT_CONTROL2_REG, 1, &eeprom_data);
                eeprom_apme_mask = E1000_EEPROM_82544_APM;
                break;
        case e1000_82546:
        case e1000_82546_rev_3:
                if (er32(STATUS) & E1000_STATUS_FUNC_1) {
                        e1000_read_eeprom(hw,
                                EEPROM_INIT_CONTROL3_PORT_B, 1, &eeprom_data);
                        break;
                }
                fallthrough;
        default:
                e1000_read_eeprom(hw,
                        EEPROM_INIT_CONTROL3_PORT_A, 1, &eeprom_data);
                break;
        }
        if (eeprom_data & eeprom_apme_mask)
                adapter->eeprom_wol |= E1000_WUFC_MAG;

        /* now that we have the eeprom settings, apply the special cases
         * where the eeprom may be wrong or the board simply won't support
         * wake on lan on a particular port
         */
        switch (pdev->device) {
        case E1000_DEV_ID_82546GB_PCIE:
                adapter->eeprom_wol = 0;
                break;
        case E1000_DEV_ID_82546EB_FIBER:
        case E1000_DEV_ID_82546GB_FIBER:
                /* Wake events only supported on port A for dual fiber
                 * regardless of eeprom setting
                 */
                if (er32(STATUS) & E1000_STATUS_FUNC_1)
                        adapter->eeprom_wol = 0;
                break;
        case E1000_DEV_ID_82546GB_QUAD_COPPER_KSP3:
                /* if quad port adapter, disable WoL on all but port A */
                if (global_quad_port_a != 0)
                        adapter->eeprom_wol = 0;
                else
                        adapter->quad_port_a = true;
                /* Reset for multiple quad port adapters */
                if (++global_quad_port_a == 4)
                        global_quad_port_a = 0;
                break;
        }

        /* initialize the wol settings based on the eeprom settings */
        adapter->wol = adapter->eeprom_wol;
        device_set_wakeup_enable(&adapter->pdev->dev, adapter->wol);

        /* Auto detect PHY address */
        if (hw->mac_type == e1000_ce4100) {
                for (i = 0; i < 32; i++) {
                        hw->phy_addr = i;
                        e1000_read_phy_reg(hw, PHY_ID2, &tmp);

                        if (tmp != 0 && tmp != 0xFF)
                                break;
                }

                if (i >= 32)
                        goto err_eeprom;
        }

        /* reset the hardware with the new settings */
        e1000_reset(adapter);

        strcpy(netdev->name, "eth%d");
        err = register_netdev(netdev);
        if (err)
                goto err_register;

        e1000_vlan_filter_on_off(adapter, false);

        /* print bus type/speed/width info */
        e_info(probe, "(PCI%s:%dMHz:%d-bit) %pM\n",
               ((hw->bus_type == e1000_bus_type_pcix) ? "-X" : ""),
               ((hw->bus_speed == e1000_bus_speed_133) ? 133 :
                (hw->bus_speed == e1000_bus_speed_120) ? 120 :
                (hw->bus_speed == e1000_bus_speed_100) ? 100 :
                (hw->bus_speed == e1000_bus_speed_66) ? 66 : 33),
               ((hw->bus_width == e1000_bus_width_64) ? 64 : 32),
               netdev->dev_addr);

        /* carrier off reporting is important to ethtool even BEFORE open */
        netif_carrier_off(netdev);

        e_info(probe, "Intel(R) PRO/1000 Network Connection\n");

        cards_found++;
        return 0;

err_register:
err_eeprom:
        e1000_phy_hw_reset(hw);

        if (hw->flash_address)
                iounmap(hw->flash_address);
err_mdio_ioremap:
        kfree(adapter->tx_ring);
        kfree(adapter->rx_ring);
err_dma:
err_sw_init:
        iounmap(hw->ce4100_gbe_mdio_base_virt);
        iounmap(hw->hw_addr);
err_ioremap:
        disable_dev = !test_and_set_bit(__E1000_DISABLED, &adapter->flags);
        free_netdev(netdev);
err_alloc_etherdev:
        pci_release_selected_regions(pdev, bars);
err_pci_reg:
        if (!adapter || disable_dev)
                pci_disable_device(pdev);
        return err;
}

/**
 * e1000_remove - Device Removal Routine
 * @pdev: PCI device information struct
 *
 * e1000_remove is called by the PCI subsystem to alert the driver
 * that it should release a PCI device. That could be caused by a
 * Hot-Plug event, or because the driver is going to be removed from
 * memory.
 **/
static void e1000_remove(struct pci_dev *pdev)
{
        struct net_device *netdev = pci_get_drvdata(pdev);
        struct e1000_adapter *adapter = netdev_priv(netdev);
        struct e1000_hw *hw = &adapter->hw;
        bool disable_dev;

        e1000_down_and_stop(adapter);
        e1000_release_manageability(adapter);

        unregister_netdev(netdev);

        /* Only kill reset task if adapter is not resetting */
        if (!test_bit(__E1000_RESETTING, &adapter->flags))
                cancel_work_sync(&adapter->reset_task);

        e1000_phy_hw_reset(hw);

        kfree(adapter->tx_ring);
        kfree(adapter->rx_ring);

        if (hw->mac_type == e1000_ce4100)
                iounmap(hw->ce4100_gbe_mdio_base_virt);
        iounmap(hw->hw_addr);
        if (hw->flash_address)
                iounmap(hw->flash_address);
        pci_release_selected_regions(pdev, adapter->bars);

        disable_dev = !test_and_set_bit(__E1000_DISABLED, &adapter->flags);
        free_netdev(netdev);

        if (disable_dev)
                pci_disable_device(pdev);
}

/**
 * e1000_sw_init - Initialize general software structures (struct e1000_adapter)
 * @adapter: board private structure to initialize
 *
 * e1000_sw_init initializes the Adapter private data structure.
 * e1000_init_hw_struct MUST be called before this function
 **/
static int e1000_sw_init(struct e1000_adapter *adapter)
{
        adapter->rx_buffer_len = MAXIMUM_ETHERNET_VLAN_SIZE;

        adapter->num_tx_queues = 1;
        adapter->num_rx_queues = 1;

        if (e1000_alloc_queues(adapter)) {
                e_err(probe, "Unable to allocate memory for queues\n");
                return -ENOMEM;
        }

        /* Explicitly disable IRQ since the NIC can be in any state. */
        e1000_irq_disable(adapter);

        spin_lock_init(&adapter->stats_lock);

        set_bit(__E1000_DOWN, &adapter->flags);

        return 0;
}

/**
 * e1000_alloc_queues - Allocate memory for all rings
 * @adapter: board private structure to initialize
 *
 * We allocate one ring per queue at run-time since we don't know the
 * number of queues at compile-time.
 **/
static int e1000_alloc_queues(struct e1000_adapter *adapter)
{
        adapter->tx_ring = kzalloc_objs(struct e1000_tx_ring,
                                        adapter->num_tx_queues);
        if (!adapter->tx_ring)
                return -ENOMEM;

        adapter->rx_ring = kzalloc_objs(struct e1000_rx_ring,
                                        adapter->num_rx_queues);
        if (!adapter->rx_ring) {
                kfree(adapter->tx_ring);
                return -ENOMEM;
        }

        return E1000_SUCCESS;
}

/**
 * e1000_open - Called when a network interface is made active
 * @netdev: network interface device structure
 *
 * Returns 0 on success, negative value on failure
 *
 * The open entry point is called when a network interface is made
 * active by the system (IFF_UP).  At this point all resources needed
 * for transmit and receive operations are allocated, the interrupt
 * handler is registered with the OS, the watchdog task is started,
 * and the stack is notified that the interface is ready.
 **/
int e1000_open(struct net_device *netdev)
{
        struct e1000_adapter *adapter = netdev_priv(netdev);
        struct e1000_hw *hw = &adapter->hw;
        int err;

        /* disallow open during test */
        if (test_bit(__E1000_TESTING, &adapter->flags))
                return -EBUSY;

        netif_carrier_off(netdev);

        /* allocate transmit descriptors */
        err = e1000_setup_all_tx_resources(adapter);
        if (err)
                goto err_setup_tx;

        /* allocate receive descriptors */
        err = e1000_setup_all_rx_resources(adapter);
        if (err)
                goto err_setup_rx;

        e1000_power_up_phy(adapter);

        adapter->mng_vlan_id = E1000_MNG_VLAN_NONE;
        if ((hw->mng_cookie.status &
                          E1000_MNG_DHCP_COOKIE_STATUS_VLAN_SUPPORT)) {
                e1000_update_mng_vlan(adapter);
        }

        /* before we allocate an interrupt, we must be ready to handle it.
         * Setting DEBUG_SHIRQ in the kernel makes it fire an interrupt
         * as soon as we call pci_request_irq, so we have to setup our
         * clean_rx handler before we do so.
         */
        e1000_configure(adapter);

        err = e1000_request_irq(adapter);
        if (err)
                goto err_req_irq;

        /* From here on the code is the same as e1000_up() */
        clear_bit(__E1000_DOWN, &adapter->flags);

        netif_napi_set_irq(&adapter->napi, adapter->pdev->irq);
        napi_enable(&adapter->napi);
        netif_queue_set_napi(netdev, 0, NETDEV_QUEUE_TYPE_RX, &adapter->napi);
        netif_queue_set_napi(netdev, 0, NETDEV_QUEUE_TYPE_TX, &adapter->napi);

        e1000_irq_enable(adapter);

        netif_start_queue(netdev);

        /* fire a link status change interrupt to start the watchdog */
        ew32(ICS, E1000_ICS_LSC);

        return E1000_SUCCESS;

err_req_irq:
        e1000_power_down_phy(adapter);
        e1000_free_all_rx_resources(adapter);
err_setup_rx:
        e1000_free_all_tx_resources(adapter);
err_setup_tx:
        e1000_reset(adapter);

        return err;
}

/**
 * e1000_close - Disables a network interface
 * @netdev: network interface device structure
 *
 * Returns 0, this is not allowed to fail
 *
 * The close entry point is called when an interface is de-activated
 * by the OS.  The hardware is still under the drivers control, but
 * needs to be disabled.  A global MAC reset is issued to stop the
 * hardware, and all transmit and receive resources are freed.
 **/
int e1000_close(struct net_device *netdev)
{
        struct e1000_adapter *adapter = netdev_priv(netdev);
        struct e1000_hw *hw = &adapter->hw;
        int count = E1000_CHECK_RESET_COUNT;

        while (test_and_set_bit(__E1000_RESETTING, &adapter->flags) && count--)
                usleep_range(10000, 20000);

        WARN_ON(count < 0);

        /* signal that we're down so that the reset task will no longer run */
        set_bit(__E1000_DOWN, &adapter->flags);
        clear_bit(__E1000_RESETTING, &adapter->flags);

        e1000_down(adapter);
        e1000_power_down_phy(adapter);
        e1000_free_irq(adapter);

        e1000_free_all_tx_resources(adapter);
        e1000_free_all_rx_resources(adapter);

        /* kill manageability vlan ID if supported, but not if a vlan with
         * the same ID is registered on the host OS (let 8021q kill it)
         */
        if ((hw->mng_cookie.status &
             E1000_MNG_DHCP_COOKIE_STATUS_VLAN_SUPPORT) &&
            !test_bit(adapter->mng_vlan_id, adapter->active_vlans)) {
                e1000_vlan_rx_kill_vid(netdev, htons(ETH_P_8021Q),
                                       adapter->mng_vlan_id);
        }

        return 0;
}

/**
 * e1000_check_64k_bound - check that memory doesn't cross 64kB boundary
 * @adapter: address of board private structure
 * @start: address of beginning of memory
 * @len: length of memory
 **/
static bool e1000_check_64k_bound(struct e1000_adapter *adapter, void *start,
                                  unsigned long len)
{
        struct e1000_hw *hw = &adapter->hw;
        unsigned long begin = (unsigned long)start;
        unsigned long end = begin + len;

        /* First rev 82545 and 82546 need to not allow any memory
         * write location to cross 64k boundary due to errata 23
         */
        if (hw->mac_type == e1000_82545 ||
            hw->mac_type == e1000_ce4100 ||
            hw->mac_type == e1000_82546) {
                return ((begin ^ (end - 1)) >> 16) == 0;
        }

        return true;
}

/**
 * e1000_setup_tx_resources - allocate Tx resources (Descriptors)
 * @adapter: board private structure
 * @txdr:    tx descriptor ring (for a specific queue) to setup
 *
 * Return 0 on success, negative on failure
 **/
static int e1000_setup_tx_resources(struct e1000_adapter *adapter,
                                    struct e1000_tx_ring *txdr)
{
        struct pci_dev *pdev = adapter->pdev;
        int size;

        size = sizeof(struct e1000_tx_buffer) * txdr->count;
        txdr->buffer_info = vzalloc(size);
        if (!txdr->buffer_info)
                return -ENOMEM;

        /* round up to nearest 4K */

        txdr->size = txdr->count * sizeof(struct e1000_tx_desc);
        txdr->size = ALIGN(txdr->size, 4096);

        txdr->desc = dma_alloc_coherent(&pdev->dev, txdr->size, &txdr->dma,
                                        GFP_KERNEL);
        if (!txdr->desc) {
setup_tx_desc_die:
                vfree(txdr->buffer_info);
                return -ENOMEM;
        }

        /* Fix for errata 23, can't cross 64kB boundary */
        if (!e1000_check_64k_bound(adapter, txdr->desc, txdr->size)) {
                void *olddesc = txdr->desc;
                dma_addr_t olddma = txdr->dma;
                e_err(tx_err, "txdr align check failed: %u bytes at %p\n",
                      txdr->size, txdr->desc);
                /* Try again, without freeing the previous */
                txdr->desc = dma_alloc_coherent(&pdev->dev, txdr->size,
                                                &txdr->dma, GFP_KERNEL);
                /* Failed allocation, critical failure */
                if (!txdr->desc) {
                        dma_free_coherent(&pdev->dev, txdr->size, olddesc,
                                          olddma);
                        goto setup_tx_desc_die;
                }

                if (!e1000_check_64k_bound(adapter, txdr->desc, txdr->size)) {
                        /* give up */
                        dma_free_coherent(&pdev->dev, txdr->size, txdr->desc,
                                          txdr->dma);
                        dma_free_coherent(&pdev->dev, txdr->size, olddesc,
                                          olddma);
                        e_err(probe, "Unable to allocate aligned memory "
                              "for the transmit descriptor ring\n");
                        vfree(txdr->buffer_info);
                        return -ENOMEM;
                } else {
                        /* Free old allocation, new allocation was successful */
                        dma_free_coherent(&pdev->dev, txdr->size, olddesc,
                                          olddma);
                }
        }
        memset(txdr->desc, 0, txdr->size);

        txdr->next_to_use = 0;
        txdr->next_to_clean = 0;

        return 0;
}

/**
 * e1000_setup_all_tx_resources - wrapper to allocate Tx resources
 *                                (Descriptors) for all queues
 * @adapter: board private structure
 *
 * Return 0 on success, negative on failure
 **/
int e1000_setup_all_tx_resources(struct e1000_adapter *adapter)
{
        int i, err = 0;

        for (i = 0; i < adapter->num_tx_queues; i++) {
                err = e1000_setup_tx_resources(adapter, &adapter->tx_ring[i]);
                if (err) {
                        e_err(probe, "Allocation for Tx Queue %u failed\n", i);
                        for (i-- ; i >= 0; i--)
                                e1000_free_tx_resources(adapter,
                                                        &adapter->tx_ring[i]);
                        break;
                }
        }

        return err;
}

/**
 * e1000_configure_tx - Configure 8254x Transmit Unit after Reset
 * @adapter: board private structure
 *
 * Configure the Tx unit of the MAC after a reset.
 **/
static void e1000_configure_tx(struct e1000_adapter *adapter)
{
        u64 tdba;
        struct e1000_hw *hw = &adapter->hw;
        u32 tdlen, tctl, tipg;
        u32 ipgr1, ipgr2;

        /* Setup the HW Tx Head and Tail descriptor pointers */

        switch (adapter->num_tx_queues) {
        case 1:
        default:
                tdba = adapter->tx_ring[0].dma;
                tdlen = adapter->tx_ring[0].count *
                        sizeof(struct e1000_tx_desc);
                ew32(TDLEN, tdlen);
                ew32(TDBAH, (tdba >> 32));
                ew32(TDBAL, (tdba & 0x00000000ffffffffULL));
                ew32(TDT, 0);
                ew32(TDH, 0);
                adapter->tx_ring[0].tdh = ((hw->mac_type >= e1000_82543) ?
                                           E1000_TDH : E1000_82542_TDH);
                adapter->tx_ring[0].tdt = ((hw->mac_type >= e1000_82543) ?
                                           E1000_TDT : E1000_82542_TDT);
                break;
        }

        /* Set the default values for the Tx Inter Packet Gap timer */
        if ((hw->media_type == e1000_media_type_fiber ||
             hw->media_type == e1000_media_type_internal_serdes))
                tipg = DEFAULT_82543_TIPG_IPGT_FIBER;
        else
                tipg = DEFAULT_82543_TIPG_IPGT_COPPER;

        switch (hw->mac_type) {
        case e1000_82542_rev2_0:
        case e1000_82542_rev2_1:
                tipg = DEFAULT_82542_TIPG_IPGT;
                ipgr1 = DEFAULT_82542_TIPG_IPGR1;
                ipgr2 = DEFAULT_82542_TIPG_IPGR2;
                break;
        default:
                ipgr1 = DEFAULT_82543_TIPG_IPGR1;
                ipgr2 = DEFAULT_82543_TIPG_IPGR2;
                break;
        }
        tipg |= ipgr1 << E1000_TIPG_IPGR1_SHIFT;
        tipg |= ipgr2 << E1000_TIPG_IPGR2_SHIFT;
        ew32(TIPG, tipg);

        /* Set the Tx Interrupt Delay register */

        ew32(TIDV, adapter->tx_int_delay);
        if (hw->mac_type >= e1000_82540)
                ew32(TADV, adapter->tx_abs_int_delay);

        /* Program the Transmit Control Register */

        tctl = er32(TCTL);
        tctl &= ~E1000_TCTL_CT;
        tctl |= E1000_TCTL_PSP | E1000_TCTL_RTLC |
                (E1000_COLLISION_THRESHOLD << E1000_CT_SHIFT);

        e1000_config_collision_dist(hw);

        /* Setup Transmit Descriptor Settings for eop descriptor */
        adapter->txd_cmd = E1000_TXD_CMD_EOP | E1000_TXD_CMD_IFCS;

        /* only set IDE if we are delaying interrupts using the timers */
        if (adapter->tx_int_delay)
                adapter->txd_cmd |= E1000_TXD_CMD_IDE;

        if (hw->mac_type < e1000_82543)
                adapter->txd_cmd |= E1000_TXD_CMD_RPS;
        else
                adapter->txd_cmd |= E1000_TXD_CMD_RS;

        /* Cache if we're 82544 running in PCI-X because we'll
         * need this to apply a workaround later in the send path.
         */
        if (hw->mac_type == e1000_82544 &&
            hw->bus_type == e1000_bus_type_pcix)
                adapter->pcix_82544 = true;

        ew32(TCTL, tctl);

}

/**
 * e1000_setup_rx_resources - allocate Rx resources (Descriptors)
 * @adapter: board private structure
 * @rxdr:    rx descriptor ring (for a specific queue) to setup
 *
 * Returns 0 on success, negative on failure
 **/
static int e1000_setup_rx_resources(struct e1000_adapter *adapter,
                                    struct e1000_rx_ring *rxdr)
{
        struct pci_dev *pdev = adapter->pdev;
        int size, desc_len;

        size = sizeof(struct e1000_rx_buffer) * rxdr->count;
        rxdr->buffer_info = vzalloc(size);
        if (!rxdr->buffer_info)
                return -ENOMEM;

        desc_len = sizeof(struct e1000_rx_desc);

        /* Round up to nearest 4K */

        rxdr->size = rxdr->count * desc_len;
        rxdr->size = ALIGN(rxdr->size, 4096);

        rxdr->desc = dma_alloc_coherent(&pdev->dev, rxdr->size, &rxdr->dma,
                                        GFP_KERNEL);
        if (!rxdr->desc) {
setup_rx_desc_die:
                vfree(rxdr->buffer_info);
                return -ENOMEM;
        }

        /* Fix for errata 23, can't cross 64kB boundary */
        if (!e1000_check_64k_bound(adapter, rxdr->desc, rxdr->size)) {
                void *olddesc = rxdr->desc;
                dma_addr_t olddma = rxdr->dma;
                e_err(rx_err, "rxdr align check failed: %u bytes at %p\n",
                      rxdr->size, rxdr->desc);
                /* Try again, without freeing the previous */
                rxdr->desc = dma_alloc_coherent(&pdev->dev, rxdr->size,
                                                &rxdr->dma, GFP_KERNEL);
                /* Failed allocation, critical failure */
                if (!rxdr->desc) {
                        dma_free_coherent(&pdev->dev, rxdr->size, olddesc,
                                          olddma);
                        goto setup_rx_desc_die;
                }

                if (!e1000_check_64k_bound(adapter, rxdr->desc, rxdr->size)) {
                        /* give up */
                        dma_free_coherent(&pdev->dev, rxdr->size, rxdr->desc,
                                          rxdr->dma);
                        dma_free_coherent(&pdev->dev, rxdr->size, olddesc,
                                          olddma);
                        e_err(probe, "Unable to allocate aligned memory for "
                              "the Rx descriptor ring\n");
                        goto setup_rx_desc_die;
                } else {
                        /* Free old allocation, new allocation was successful */
                        dma_free_coherent(&pdev->dev, rxdr->size, olddesc,
                                          olddma);
                }
        }
        memset(rxdr->desc, 0, rxdr->size);

        rxdr->next_to_clean = 0;
        rxdr->next_to_use = 0;
        rxdr->rx_skb_top = NULL;

        return 0;
}

/**
 * e1000_setup_all_rx_resources - wrapper to allocate Rx resources
 *                                (Descriptors) for all queues
 * @adapter: board private structure
 *
 * Return 0 on success, negative on failure
 **/
int e1000_setup_all_rx_resources(struct e1000_adapter *adapter)
{
        int i, err = 0;

        for (i = 0; i < adapter->num_rx_queues; i++) {
                err = e1000_setup_rx_resources(adapter, &adapter->rx_ring[i]);
                if (err) {
                        e_err(probe, "Allocation for Rx Queue %u failed\n", i);
                        for (i-- ; i >= 0; i--)
                                e1000_free_rx_resources(adapter,
                                                        &adapter->rx_ring[i]);
                        break;
                }
        }

        return err;
}

/**
 * e1000_setup_rctl - configure the receive control registers
 * @adapter: Board private structure
 **/
static void e1000_setup_rctl(struct e1000_adapter *adapter)
{
        struct e1000_hw *hw = &adapter->hw;
        u32 rctl;

        rctl = er32(RCTL);

        rctl &= ~(3 << E1000_RCTL_MO_SHIFT);

        rctl |= E1000_RCTL_BAM | E1000_RCTL_LBM_NO |
                E1000_RCTL_RDMTS_HALF |
                (hw->mc_filter_type << E1000_RCTL_MO_SHIFT);

        if (hw->tbi_compatibility_on == 1)
                rctl |= E1000_RCTL_SBP;
        else
                rctl &= ~E1000_RCTL_SBP;

        if (adapter->netdev->mtu <= ETH_DATA_LEN)
                rctl &= ~E1000_RCTL_LPE;
        else
                rctl |= E1000_RCTL_LPE;

        /* Setup buffer sizes */
        rctl &= ~E1000_RCTL_SZ_4096;
        rctl |= E1000_RCTL_BSEX;
        switch (adapter->rx_buffer_len) {
        case E1000_RXBUFFER_2048:
        default:
                rctl |= E1000_RCTL_SZ_2048;
                rctl &= ~E1000_RCTL_BSEX;
                break;
        case E1000_RXBUFFER_4096:
                rctl |= E1000_RCTL_SZ_4096;
                break;
        case E1000_RXBUFFER_8192:
                rctl |= E1000_RCTL_SZ_8192;
                break;
        case E1000_RXBUFFER_16384:
                rctl |= E1000_RCTL_SZ_16384;
                break;
        }

        /* This is useful for sniffing bad packets. */
        if (adapter->netdev->features & NETIF_F_RXALL) {
                /* UPE and MPE will be handled by normal PROMISC logic
                 * in e1000e_set_rx_mode
                 */
                rctl |= (E1000_RCTL_SBP | /* Receive bad packets */
                         E1000_RCTL_BAM | /* RX All Bcast Pkts */
                         E1000_RCTL_PMCF); /* RX All MAC Ctrl Pkts */

                rctl &= ~(E1000_RCTL_VFE | /* Disable VLAN filter */
                          E1000_RCTL_DPF | /* Allow filtered pause */
                          E1000_RCTL_CFIEN); /* Dis VLAN CFIEN Filter */
                /* Do not mess with E1000_CTRL_VME, it affects transmit as well,
                 * and that breaks VLANs.
                 */
        }

        ew32(RCTL, rctl);
}

/**
 * e1000_configure_rx - Configure 8254x Receive Unit after Reset
 * @adapter: board private structure
 *
 * Configure the Rx unit of the MAC after a reset.
 **/
static void e1000_configure_rx(struct e1000_adapter *adapter)
{
        u64 rdba;
        struct e1000_hw *hw = &adapter->hw;
        u32 rdlen, rctl, rxcsum;

        if (adapter->netdev->mtu > ETH_DATA_LEN) {
                rdlen = adapter->rx_ring[0].count *
                        sizeof(struct e1000_rx_desc);
                adapter->clean_rx = e1000_clean_jumbo_rx_irq;
                adapter->alloc_rx_buf = e1000_alloc_jumbo_rx_buffers;
        } else {
                rdlen = adapter->rx_ring[0].count *
                        sizeof(struct e1000_rx_desc);
                adapter->clean_rx = e1000_clean_rx_irq;
                adapter->alloc_rx_buf = e1000_alloc_rx_buffers;
        }

        /* disable receives while setting up the descriptors */
        rctl = er32(RCTL);
        ew32(RCTL, rctl & ~E1000_RCTL_EN);

        /* set the Receive Delay Timer Register */
        ew32(RDTR, adapter->rx_int_delay);

        if (hw->mac_type >= e1000_82540) {
                ew32(RADV, adapter->rx_abs_int_delay);
                if (adapter->itr_setting != 0)
                        ew32(ITR, 1000000000 / (adapter->itr * 256));
        }

        /* Setup the HW Rx Head and Tail Descriptor Pointers and
         * the Base and Length of the Rx Descriptor Ring
         */
        switch (adapter->num_rx_queues) {
        case 1:
        default:
                rdba = adapter->rx_ring[0].dma;
                ew32(RDLEN, rdlen);
                ew32(RDBAH, (rdba >> 32));
                ew32(RDBAL, (rdba & 0x00000000ffffffffULL));
                ew32(RDT, 0);
                ew32(RDH, 0);
                adapter->rx_ring[0].rdh = ((hw->mac_type >= e1000_82543) ?
                                           E1000_RDH : E1000_82542_RDH);
                adapter->rx_ring[0].rdt = ((hw->mac_type >= e1000_82543) ?
                                           E1000_RDT : E1000_82542_RDT);
                break;
        }

        /* Enable 82543 Receive Checksum Offload for TCP and UDP */
        if (hw->mac_type >= e1000_82543) {
                rxcsum = er32(RXCSUM);
                if (adapter->rx_csum)
                        rxcsum |= E1000_RXCSUM_TUOFL;
                else
                        /* don't need to clear IPPCSE as it defaults to 0 */
                        rxcsum &= ~E1000_RXCSUM_TUOFL;
                ew32(RXCSUM, rxcsum);
        }

        /* Enable Receives */
        ew32(RCTL, rctl | E1000_RCTL_EN);
}

/**
 * e1000_free_tx_resources - Free Tx Resources per Queue
 * @adapter: board private structure
 * @tx_ring: Tx descriptor ring for a specific queue
 *
 * Free all transmit software resources
 **/
static void e1000_free_tx_resources(struct e1000_adapter *adapter,
                                    struct e1000_tx_ring *tx_ring)
{
        struct pci_dev *pdev = adapter->pdev;

        e1000_clean_tx_ring(adapter, tx_ring);

        vfree(tx_ring->buffer_info);
        tx_ring->buffer_info = NULL;

        dma_free_coherent(&pdev->dev, tx_ring->size, tx_ring->desc,
                          tx_ring->dma);

        tx_ring->desc = NULL;
}

/**
 * e1000_free_all_tx_resources - Free Tx Resources for All Queues
 * @adapter: board private structure
 *
 * Free all transmit software resources
 **/
void e1000_free_all_tx_resources(struct e1000_adapter *adapter)
{
        int i;

        for (i = 0; i < adapter->num_tx_queues; i++)
                e1000_free_tx_resources(adapter, &adapter->tx_ring[i]);
}

static void
e1000_unmap_and_free_tx_resource(struct e1000_adapter *adapter,
                                 struct e1000_tx_buffer *buffer_info,
                                 int budget)
{
        if (buffer_info->dma) {
                if (buffer_info->mapped_as_page)
                        dma_unmap_page(&adapter->pdev->dev, buffer_info->dma,
                                       buffer_info->length, DMA_TO_DEVICE);
                else
                        dma_unmap_single(&adapter->pdev->dev, buffer_info->dma,
                                         buffer_info->length,
                                         DMA_TO_DEVICE);
                buffer_info->dma = 0;
        }
        if (buffer_info->skb) {
                napi_consume_skb(buffer_info->skb, budget);
                buffer_info->skb = NULL;
        }
        buffer_info->time_stamp = 0;
        /* buffer_info must be completely set up in the transmit path */
}

/**
 * e1000_clean_tx_ring - Free Tx Buffers
 * @adapter: board private structure
 * @tx_ring: ring to be cleaned
 **/
static void e1000_clean_tx_ring(struct e1000_adapter *adapter,
                                struct e1000_tx_ring *tx_ring)
{
        struct e1000_hw *hw = &adapter->hw;
        struct e1000_tx_buffer *buffer_info;
        unsigned long size;
        unsigned int i;

        /* Free all the Tx ring sk_buffs */

        for (i = 0; i < tx_ring->count; i++) {
                buffer_info = &tx_ring->buffer_info[i];
                e1000_unmap_and_free_tx_resource(adapter, buffer_info, 0);
        }

        netdev_reset_queue(adapter->netdev);
        size = sizeof(struct e1000_tx_buffer) * tx_ring->count;
        memset(tx_ring->buffer_info, 0, size);

        /* Zero out the descriptor ring */

        memset(tx_ring->desc, 0, tx_ring->size);

        tx_ring->next_to_use = 0;
        tx_ring->next_to_clean = 0;
        tx_ring->last_tx_tso = false;

        writel(0, hw->hw_addr + tx_ring->tdh);
        writel(0, hw->hw_addr + tx_ring->tdt);
}

/**
 * e1000_clean_all_tx_rings - Free Tx Buffers for all queues
 * @adapter: board private structure
 **/
static void e1000_clean_all_tx_rings(struct e1000_adapter *adapter)
{
        int i;

        for (i = 0; i < adapter->num_tx_queues; i++)
                e1000_clean_tx_ring(adapter, &adapter->tx_ring[i]);
}

/**
 * e1000_free_rx_resources - Free Rx Resources
 * @adapter: board private structure
 * @rx_ring: ring to clean the resources from
 *
 * Free all receive software resources
 **/
static void e1000_free_rx_resources(struct e1000_adapter *adapter,
                                    struct e1000_rx_ring *rx_ring)
{
        struct pci_dev *pdev = adapter->pdev;

        e1000_clean_rx_ring(adapter, rx_ring);

        vfree(rx_ring->buffer_info);
        rx_ring->buffer_info = NULL;

        dma_free_coherent(&pdev->dev, rx_ring->size, rx_ring->desc,
                          rx_ring->dma);

        rx_ring->desc = NULL;
}

/**
 * e1000_free_all_rx_resources - Free Rx Resources for All Queues
 * @adapter: board private structure
 *
 * Free all receive software resources
 **/
void e1000_free_all_rx_resources(struct e1000_adapter *adapter)
{
        int i;

        for (i = 0; i < adapter->num_rx_queues; i++)
                e1000_free_rx_resources(adapter, &adapter->rx_ring[i]);
}

#define E1000_HEADROOM (NET_SKB_PAD + NET_IP_ALIGN)
static unsigned int e1000_frag_len(const struct e1000_adapter *a)
{
        return SKB_DATA_ALIGN(a->rx_buffer_len + E1000_HEADROOM) +
                SKB_DATA_ALIGN(sizeof(struct skb_shared_info));
}

static void *e1000_alloc_frag(const struct e1000_adapter *a)
{
        unsigned int len = e1000_frag_len(a);
        u8 *data = netdev_alloc_frag(len);

        if (likely(data))
                data += E1000_HEADROOM;
        return data;
}

/**
 * e1000_clean_rx_ring - Free Rx Buffers per Queue
 * @adapter: board private structure
 * @rx_ring: ring to free buffers from
 **/
static void e1000_clean_rx_ring(struct e1000_adapter *adapter,
                                struct e1000_rx_ring *rx_ring)
{
        struct e1000_hw *hw = &adapter->hw;
        struct e1000_rx_buffer *buffer_info;
        struct pci_dev *pdev = adapter->pdev;
        unsigned long size;
        unsigned int i;

        /* Free all the Rx netfrags */
        for (i = 0; i < rx_ring->count; i++) {
                buffer_info = &rx_ring->buffer_info[i];
                if (adapter->clean_rx == e1000_clean_rx_irq) {
                        if (buffer_info->dma)
                                dma_unmap_single(&pdev->dev, buffer_info->dma,
                                                 adapter->rx_buffer_len,
                                                 DMA_FROM_DEVICE);
                        if (buffer_info->rxbuf.data) {
                                skb_free_frag(buffer_info->rxbuf.data);
                                buffer_info->rxbuf.data = NULL;
                        }
                } else if (adapter->clean_rx == e1000_clean_jumbo_rx_irq) {
                        if (buffer_info->dma)
                                dma_unmap_page(&pdev->dev, buffer_info->dma,
                                               adapter->rx_buffer_len,
                                               DMA_FROM_DEVICE);
                        if (buffer_info->rxbuf.page) {
                                put_page(buffer_info->rxbuf.page);
                                buffer_info->rxbuf.page = NULL;
                        }
                }

                buffer_info->dma = 0;
        }

        /* there also may be some cached data from a chained receive */
        napi_free_frags(&adapter->napi);
        rx_ring->rx_skb_top = NULL;

        size = sizeof(struct e1000_rx_buffer) * rx_ring->count;
        memset(rx_ring->buffer_info, 0, size);

        /* Zero out the descriptor ring */
        memset(rx_ring->desc, 0, rx_ring->size);

        rx_ring->next_to_clean = 0;
        rx_ring->next_to_use = 0;

        writel(0, hw->hw_addr + rx_ring->rdh);
        writel(0, hw->hw_addr + rx_ring->rdt);
}

/**
 * e1000_clean_all_rx_rings - Free Rx Buffers for all queues
 * @adapter: board private structure
 **/
static void e1000_clean_all_rx_rings(struct e1000_adapter *adapter)
{
        int i;

        for (i = 0; i < adapter->num_rx_queues; i++)
                e1000_clean_rx_ring(adapter, &adapter->rx_ring[i]);
}

/* The 82542 2.0 (revision 2) needs to have the receive unit in reset
 * and memory write and invalidate disabled for certain operations
 */
static void e1000_enter_82542_rst(struct e1000_adapter *adapter)
{
        struct e1000_hw *hw = &adapter->hw;
        struct net_device *netdev = adapter->netdev;
        u32 rctl;

        e1000_pci_clear_mwi(hw);

        rctl = er32(RCTL);
        rctl |= E1000_RCTL_RST;
        ew32(RCTL, rctl);
        E1000_WRITE_FLUSH();
        mdelay(5);

        if (netif_running(netdev))
                e1000_clean_all_rx_rings(adapter);
}

static void e1000_leave_82542_rst(struct e1000_adapter *adapter)
{
        struct e1000_hw *hw = &adapter->hw;
        struct net_device *netdev = adapter->netdev;
        u32 rctl;

        rctl = er32(RCTL);
        rctl &= ~E1000_RCTL_RST;
        ew32(RCTL, rctl);
        E1000_WRITE_FLUSH();
        mdelay(5);

        if (hw->pci_cmd_word & PCI_COMMAND_INVALIDATE)
                e1000_pci_set_mwi(hw);

        if (netif_running(netdev)) {
                /* No need to loop, because 82542 supports only 1 queue */
                struct e1000_rx_ring *ring = &adapter->rx_ring[0];
                e1000_configure_rx(adapter);
                adapter->alloc_rx_buf(adapter, ring, E1000_DESC_UNUSED(ring));
        }
}

/**
 * e1000_set_mac - Change the Ethernet Address of the NIC
 * @netdev: network interface device structure
 * @p: pointer to an address structure
 *
 * Returns 0 on success, negative on failure
 **/
static int e1000_set_mac(struct net_device *netdev, void *p)
{
        struct e1000_adapter *adapter = netdev_priv(netdev);
        struct e1000_hw *hw = &adapter->hw;
        struct sockaddr *addr = p;

        if (!is_valid_ether_addr(addr->sa_data))
                return -EADDRNOTAVAIL;

        /* 82542 2.0 needs to be in reset to write receive address registers */

        if (hw->mac_type == e1000_82542_rev2_0)
                e1000_enter_82542_rst(adapter);

        eth_hw_addr_set(netdev, addr->sa_data);
        memcpy(hw->mac_addr, addr->sa_data, netdev->addr_len);

        e1000_rar_set(hw, hw->mac_addr, 0);

        if (hw->mac_type == e1000_82542_rev2_0)
                e1000_leave_82542_rst(adapter);

        return 0;
}

/**
 * e1000_set_rx_mode - Secondary Unicast, Multicast and Promiscuous mode set
 * @netdev: network interface device structure
 *
 * The set_rx_mode entry point is called whenever the unicast or multicast
 * address lists or the network interface flags are updated. This routine is
 * responsible for configuring the hardware for proper unicast, multicast,
 * promiscuous mode, and all-multi behavior.
 **/
static void e1000_set_rx_mode(struct net_device *netdev)
{
        struct e1000_adapter *adapter = netdev_priv(netdev);
        struct e1000_hw *hw = &adapter->hw;
        struct netdev_hw_addr *ha;
        bool use_uc = false;
        u32 rctl;
        u32 hash_value;
        int i, rar_entries = E1000_RAR_ENTRIES;
        int mta_reg_count = E1000_NUM_MTA_REGISTERS;
        u32 *mcarray = kcalloc(mta_reg_count, sizeof(u32), GFP_ATOMIC);

        if (!mcarray)
                return;

        /* Check for Promiscuous and All Multicast modes */

        rctl = er32(RCTL);

        if (netdev->flags & IFF_PROMISC) {
                rctl |= (E1000_RCTL_UPE | E1000_RCTL_MPE);
                rctl &= ~E1000_RCTL_VFE;
        } else {
                if (netdev->flags & IFF_ALLMULTI)
                        rctl |= E1000_RCTL_MPE;
                else
                        rctl &= ~E1000_RCTL_MPE;
                /* Enable VLAN filter if there is a VLAN */
                if (e1000_vlan_used(adapter))
                        rctl |= E1000_RCTL_VFE;
        }

        if (netdev_uc_count(netdev) > rar_entries - 1) {
                rctl |= E1000_RCTL_UPE;
        } else if (!(netdev->flags & IFF_PROMISC)) {
                rctl &= ~E1000_RCTL_UPE;
                use_uc = true;
        }

        ew32(RCTL, rctl);

        /* 82542 2.0 needs to be in reset to write receive address registers */

        if (hw->mac_type == e1000_82542_rev2_0)
                e1000_enter_82542_rst(adapter);

        /* load the first 14 addresses into the exact filters 1-14. Unicast
         * addresses take precedence to avoid disabling unicast filtering
         * when possible.
         *
         * RAR 0 is used for the station MAC address
         * if there are not 14 addresses, go ahead and clear the filters
         */
        i = 1;
        if (use_uc)
                netdev_for_each_uc_addr(ha, netdev) {
                        if (i == rar_entries)
                                break;
                        e1000_rar_set(hw, ha->addr, i++);
                }

        netdev_for_each_mc_addr(ha, netdev) {
                if (i == rar_entries) {
                        /* load any remaining addresses into the hash table */
                        u32 hash_reg, hash_bit, mta;
                        hash_value = e1000_hash_mc_addr(hw, ha->addr);
                        hash_reg = (hash_value >> 5) & 0x7F;
                        hash_bit = hash_value & 0x1F;
                        mta = (1 << hash_bit);
                        mcarray[hash_reg] |= mta;
                } else {
                        e1000_rar_set(hw, ha->addr, i++);
                }
        }

        for (; i < rar_entries; i++) {
                E1000_WRITE_REG_ARRAY(hw, RA, i << 1, 0);
                E1000_WRITE_FLUSH();
                E1000_WRITE_REG_ARRAY(hw, RA, (i << 1) + 1, 0);
                E1000_WRITE_FLUSH();
        }

        /* write the hash table completely, write from bottom to avoid
         * both stupid write combining chipsets, and flushing each write
         */
        for (i = mta_reg_count - 1; i >= 0 ; i--) {
                /* If we are on an 82544 has an errata where writing odd
                 * offsets overwrites the previous even offset, but writing
                 * backwards over the range solves the issue by always
                 * writing the odd offset first
                 */
                E1000_WRITE_REG_ARRAY(hw, MTA, i, mcarray[i]);
        }
        E1000_WRITE_FLUSH();

        if (hw->mac_type == e1000_82542_rev2_0)
                e1000_leave_82542_rst(adapter);

        kfree(mcarray);
}

/**
 * e1000_update_phy_info_task - get phy info
 * @work: work struct contained inside adapter struct
 *
 * Need to wait a few seconds after link up to get diagnostic information from
 * the phy
 */
static void e1000_update_phy_info_task(struct work_struct *work)
{
        struct e1000_adapter *adapter = container_of(work,
                                                     struct e1000_adapter,
                                                     phy_info_task.work);

        e1000_phy_get_info(&adapter->hw, &adapter->phy_info);
}

/**
 * e1000_82547_tx_fifo_stall_task - task to complete work
 * @work: work struct contained inside adapter struct
 **/
static void e1000_82547_tx_fifo_stall_task(struct work_struct *work)
{
        struct e1000_adapter *adapter = container_of(work,
                                                     struct e1000_adapter,
                                                     fifo_stall_task.work);
        struct e1000_hw *hw = &adapter->hw;
        struct net_device *netdev = adapter->netdev;
        u32 tctl;

        if (atomic_read(&adapter->tx_fifo_stall)) {
                if ((er32(TDT) == er32(TDH)) &&
                   (er32(TDFT) == er32(TDFH)) &&
                   (er32(TDFTS) == er32(TDFHS))) {
                        tctl = er32(TCTL);
                        ew32(TCTL, tctl & ~E1000_TCTL_EN);
                        ew32(TDFT, adapter->tx_head_addr);
                        ew32(TDFH, adapter->tx_head_addr);
                        ew32(TDFTS, adapter->tx_head_addr);
                        ew32(TDFHS, adapter->tx_head_addr);
                        ew32(TCTL, tctl);
                        E1000_WRITE_FLUSH();

                        adapter->tx_fifo_head = 0;
                        atomic_set(&adapter->tx_fifo_stall, 0);
                        netif_wake_queue(netdev);
                } else if (!test_bit(__E1000_DOWN, &adapter->flags)) {
                        schedule_delayed_work(&adapter->fifo_stall_task, 1);
                }
        }
}

bool e1000_has_link(struct e1000_adapter *adapter)
{
        struct e1000_hw *hw = &adapter->hw;
        bool link_active = false;

        /* get_link_status is set on LSC (link status) interrupt or rx
         * sequence error interrupt (except on intel ce4100).
         * get_link_status will stay false until the
         * e1000_check_for_link establishes link for copper adapters
         * ONLY
         */
        switch (hw->media_type) {
        case e1000_media_type_copper:
                if (hw->mac_type == e1000_ce4100)
                        hw->get_link_status = 1;
                if (hw->get_link_status) {
                        e1000_check_for_link(hw);
                        link_active = !hw->get_link_status;
                } else {
                        link_active = true;
                }
                break;
        case e1000_media_type_fiber:
                e1000_check_for_link(hw);
                link_active = !!(er32(STATUS) & E1000_STATUS_LU);
                break;
        case e1000_media_type_internal_serdes:
                e1000_check_for_link(hw);
                link_active = hw->serdes_has_link;
                break;
        default:
                break;
        }

        return link_active;
}

/**
 * e1000_watchdog - work function
 * @work: work struct contained inside adapter struct
 **/
static void e1000_watchdog(struct work_struct *work)
{
        struct e1000_adapter *adapter = container_of(work,
                                                     struct e1000_adapter,
                                                     watchdog_task.work);
        struct e1000_hw *hw = &adapter->hw;
        struct net_device *netdev = adapter->netdev;
        struct e1000_tx_ring *txdr = adapter->tx_ring;
        u32 link, tctl;

        link = e1000_has_link(adapter);
        if ((netif_carrier_ok(netdev)) && link)
                goto link_up;

        if (link) {
                if (!netif_carrier_ok(netdev)) {
                        u32 ctrl;
                        /* update snapshot of PHY registers on LSC */
                        e1000_get_speed_and_duplex(hw,
                                                   &adapter->link_speed,
                                                   &adapter->link_duplex);

                        ctrl = er32(CTRL);
                        pr_info("%s NIC Link is Up %d Mbps %s, "
                                "Flow Control: %s\n",
                                netdev->name,
                                adapter->link_speed,
                                adapter->link_duplex == FULL_DUPLEX ?
                                "Full Duplex" : "Half Duplex",
                                ((ctrl & E1000_CTRL_TFCE) && (ctrl &
                                E1000_CTRL_RFCE)) ? "RX/TX" : ((ctrl &
                                E1000_CTRL_RFCE) ? "RX" : ((ctrl &
                                E1000_CTRL_TFCE) ? "TX" : "None")));

                        /* adjust timeout factor according to speed/duplex */
                        adapter->tx_timeout_factor = 1;
                        switch (adapter->link_speed) {
                        case SPEED_10:
                                adapter->tx_timeout_factor = 16;
                                break;
                        case SPEED_100:
                                /* maybe add some timeout factor ? */
                                break;
                        }

                        /* enable transmits in the hardware */
                        tctl = er32(TCTL);
                        tctl |= E1000_TCTL_EN;
                        ew32(TCTL, tctl);

                        netif_carrier_on(netdev);
                        if (!test_bit(__E1000_DOWN, &adapter->flags))
                                schedule_delayed_work(&adapter->phy_info_task,
                                                      2 * HZ);
                        adapter->smartspeed = 0;
                }
        } else {
                if (netif_carrier_ok(netdev)) {
                        adapter->link_speed = 0;
                        adapter->link_duplex = 0;
                        pr_info("%s NIC Link is Down\n",
                                netdev->name);
                        netif_carrier_off(netdev);

                        if (!test_bit(__E1000_DOWN, &adapter->flags))
                                schedule_delayed_work(&adapter->phy_info_task,
                                                      2 * HZ);
                }

                e1000_smartspeed(adapter);
        }

link_up:
        e1000_update_stats(adapter);

        hw->tx_packet_delta = adapter->stats.tpt - adapter->tpt_old;
        adapter->tpt_old = adapter->stats.tpt;
        hw->collision_delta = adapter->stats.colc - adapter->colc_old;
        adapter->colc_old = adapter->stats.colc;

        adapter->gorcl = adapter->stats.gorcl - adapter->gorcl_old;
        adapter->gorcl_old = adapter->stats.gorcl;
        adapter->gotcl = adapter->stats.gotcl - adapter->gotcl_old;
        adapter->gotcl_old = adapter->stats.gotcl;

        e1000_update_adaptive(hw);

        if (!netif_carrier_ok(netdev)) {
                if (E1000_DESC_UNUSED(txdr) + 1 < txdr->count) {
                        /* We've lost link, so the controller stops DMA,
                         * but we've got queued Tx work that's never going
                         * to get done, so reset controller to flush Tx.
                         * (Do the reset outside of interrupt context).
                         */
                        adapter->tx_timeout_count++;
                        schedule_work(&adapter->reset_task);
                        /* exit immediately since reset is imminent */
                        return;
                }
        }

        /* Simple mode for Interrupt Throttle Rate (ITR) */
        if (hw->mac_type >= e1000_82540 && adapter->itr_setting == 4) {
                /* Symmetric Tx/Rx gets a reduced ITR=2000;
                 * Total asymmetrical Tx or Rx gets ITR=8000;
                 * everyone else is between 2000-8000.
                 */
                u32 goc = (adapter->gotcl + adapter->gorcl) / 10000;
                u32 dif = (adapter->gotcl > adapter->gorcl ?
                            adapter->gotcl - adapter->gorcl :
                            adapter->gorcl - adapter->gotcl) / 10000;
                u32 itr = goc > 0 ? (dif * 6000 / goc + 2000) : 8000;

                ew32(ITR, 1000000000 / (itr * 256));
        }

        /* Cause software interrupt to ensure rx ring is cleaned */
        ew32(ICS, E1000_ICS_RXDMT0);

        /* Force detection of hung controller every watchdog period */
        adapter->detect_tx_hung = true;

        /* Reschedule the task */
        if (!test_bit(__E1000_DOWN, &adapter->flags))
                schedule_delayed_work(&adapter->watchdog_task, 2 * HZ);
}

enum latency_range {
        lowest_latency = 0,
        low_latency = 1,
        bulk_latency = 2,
        latency_invalid = 255
};

/**
 * e1000_update_itr - update the dynamic ITR value based on statistics
 * @adapter: pointer to adapter
 * @itr_setting: current adapter->itr
 * @packets: the number of packets during this measurement interval
 * @bytes: the number of bytes during this measurement interval
 *
 *      Stores a new ITR value based on packets and byte
 *      counts during the last interrupt.  The advantage of per interrupt
 *      computation is faster updates and more accurate ITR for the current
 *      traffic pattern.  Constants in this function were computed
 *      based on theoretical maximum wire speed and thresholds were set based
 *      on testing data as well as attempting to minimize response time
 *      while increasing bulk throughput.
 *      this functionality is controlled by the InterruptThrottleRate module
 *      parameter (see e1000_param.c)
 **/
static unsigned int e1000_update_itr(struct e1000_adapter *adapter,
                                     u16 itr_setting, int packets, int bytes)
{
        unsigned int retval = itr_setting;
        struct e1000_hw *hw = &adapter->hw;

        if (unlikely(hw->mac_type < e1000_82540))
                goto update_itr_done;

        if (packets == 0)
                goto update_itr_done;

        switch (itr_setting) {
        case lowest_latency:
                /* jumbo frames get bulk treatment*/
                if (bytes/packets > 8000)
                        retval = bulk_latency;
                else if ((packets < 5) && (bytes > 512))
                        retval = low_latency;
                break;
        case low_latency:  /* 50 usec aka 20000 ints/s */
                if (bytes > 10000) {
                        /* jumbo frames need bulk latency setting */
                        if (bytes/packets > 8000)
                                retval = bulk_latency;
                        else if ((packets < 10) || ((bytes/packets) > 1200))
                                retval = bulk_latency;
                        else if ((packets > 35))
                                retval = lowest_latency;
                } else if (bytes/packets > 2000)
                        retval = bulk_latency;
                else if (packets <= 2 && bytes < 512)
                        retval = lowest_latency;
                break;
        case bulk_latency: /* 250 usec aka 4000 ints/s */
                if (bytes > 25000) {
                        if (packets > 35)
                                retval = low_latency;
                } else if (bytes < 6000) {
                        retval = low_latency;
                }
                break;
        }

update_itr_done:
        return retval;
}

static void e1000_set_itr(struct e1000_adapter *adapter)
{
        struct e1000_hw *hw = &adapter->hw;
        u16 current_itr;
        u32 new_itr = adapter->itr;

        if (unlikely(hw->mac_type < e1000_82540))
                return;

        /* for non-gigabit speeds, just fix the interrupt rate at 4000 */
        if (unlikely(adapter->link_speed != SPEED_1000)) {
                new_itr = 4000;
                goto set_itr_now;
        }

        adapter->tx_itr = e1000_update_itr(adapter, adapter->tx_itr,
                                           adapter->total_tx_packets,
                                           adapter->total_tx_bytes);
        /* conservative mode (itr 3) eliminates the lowest_latency setting */
        if (adapter->itr_setting == 3 && adapter->tx_itr == lowest_latency)
                adapter->tx_itr = low_latency;

        adapter->rx_itr = e1000_update_itr(adapter, adapter->rx_itr,
                                           adapter->total_rx_packets,
                                           adapter->total_rx_bytes);
        /* conservative mode (itr 3) eliminates the lowest_latency setting */
        if (adapter->itr_setting == 3 && adapter->rx_itr == lowest_latency)
                adapter->rx_itr = low_latency;

        current_itr = max(adapter->rx_itr, adapter->tx_itr);

        switch (current_itr) {
        /* counts and packets in update_itr are dependent on these numbers */
        case lowest_latency:
                new_itr = 70000;
                break;
        case low_latency:
                new_itr = 20000; /* aka hwitr = ~200 */
                break;
        case bulk_latency:
                new_itr = 4000;
                break;
        default:
                break;
        }

set_itr_now:
        if (new_itr != adapter->itr) {
                /* this attempts to bias the interrupt rate towards Bulk
                 * by adding intermediate steps when interrupt rate is
                 * increasing
                 */
                new_itr = new_itr > adapter->itr ?
                          min(adapter->itr + (new_itr >> 2), new_itr) :
                          new_itr;
                adapter->itr = new_itr;
                ew32(ITR, 1000000000 / (new_itr * 256));
        }
}

#define E1000_TX_FLAGS_CSUM             0x00000001
#define E1000_TX_FLAGS_VLAN             0x00000002
#define E1000_TX_FLAGS_TSO              0x00000004
#define E1000_TX_FLAGS_IPV4             0x00000008
#define E1000_TX_FLAGS_NO_FCS           0x00000010
#define E1000_TX_FLAGS_VLAN_MASK        0xffff0000
#define E1000_TX_FLAGS_VLAN_SHIFT       16

static int e1000_tso(struct e1000_adapter *adapter,
                     struct e1000_tx_ring *tx_ring, struct sk_buff *skb,
                     __be16 protocol)
{
        struct e1000_context_desc *context_desc;
        struct e1000_tx_buffer *buffer_info;
        unsigned int i;
        u32 cmd_length = 0;
        u16 ipcse = 0, tucse, mss;
        u8 ipcss, ipcso, tucss, tucso, hdr_len;

        if (skb_is_gso(skb)) {
                int err;

                err = skb_cow_head(skb, 0);
                if (err < 0)
                        return err;

                hdr_len = skb_tcp_all_headers(skb);
                mss = skb_shinfo(skb)->gso_size;
                if (protocol == htons(ETH_P_IP)) {
                        struct iphdr *iph = ip_hdr(skb);
                        iph->tot_len = 0;
                        iph->check = 0;
                        tcp_hdr(skb)->check = ~csum_tcpudp_magic(iph->saddr,
                                                                 iph->daddr, 0,
                                                                 IPPROTO_TCP,
                                                                 0);
                        cmd_length = E1000_TXD_CMD_IP;
                        ipcse = skb_transport_offset(skb) - 1;
                } else if (skb_is_gso_v6(skb)) {
                        tcp_v6_gso_csum_prep(skb);
                        ipcse = 0;
                }
                ipcss = skb_network_offset(skb);
                ipcso = (void *)&(ip_hdr(skb)->check) - (void *)skb->data;
                tucss = skb_transport_offset(skb);
                tucso = (void *)&(tcp_hdr(skb)->check) - (void *)skb->data;
                tucse = 0;

                cmd_length |= (E1000_TXD_CMD_DEXT | E1000_TXD_CMD_TSE |
                               E1000_TXD_CMD_TCP | (skb->len - (hdr_len)));

                i = tx_ring->next_to_use;
                context_desc = E1000_CONTEXT_DESC(*tx_ring, i);
                buffer_info = &tx_ring->buffer_info[i];

                context_desc->lower_setup.ip_fields.ipcss  = ipcss;
                context_desc->lower_setup.ip_fields.ipcso  = ipcso;
                context_desc->lower_setup.ip_fields.ipcse  = cpu_to_le16(ipcse);
                context_desc->upper_setup.tcp_fields.tucss = tucss;
                context_desc->upper_setup.tcp_fields.tucso = tucso;
                context_desc->upper_setup.tcp_fields.tucse = cpu_to_le16(tucse);
                context_desc->tcp_seg_setup.fields.mss     = cpu_to_le16(mss);
                context_desc->tcp_seg_setup.fields.hdr_len = hdr_len;
                context_desc->cmd_and_length = cpu_to_le32(cmd_length);

                buffer_info->time_stamp = jiffies;
                buffer_info->next_to_watch = i;

                if (++i == tx_ring->count)
                        i = 0;

                tx_ring->next_to_use = i;

                return true;
        }
        return false;
}

static bool e1000_tx_csum(struct e1000_adapter *adapter,
                          struct e1000_tx_ring *tx_ring, struct sk_buff *skb,
                          __be16 protocol)
{
        struct e1000_context_desc *context_desc;
        struct e1000_tx_buffer *buffer_info;
        unsigned int i;
        u8 css;
        u32 cmd_len = E1000_TXD_CMD_DEXT;

        if (skb->ip_summed != CHECKSUM_PARTIAL)
                return false;

        switch (protocol) {
        case cpu_to_be16(ETH_P_IP):
                if (ip_hdr(skb)->protocol == IPPROTO_TCP)
                        cmd_len |= E1000_TXD_CMD_TCP;
                break;
        case cpu_to_be16(ETH_P_IPV6):
                /* XXX not handling all IPV6 headers */
                if (ipv6_hdr(skb)->nexthdr == IPPROTO_TCP)
                        cmd_len |= E1000_TXD_CMD_TCP;
                break;
        default:
                if (unlikely(net_ratelimit()))
                        e_warn(drv, "checksum_partial proto=%x!\n",
                               skb->protocol);
                break;
        }

        css = skb_checksum_start_offset(skb);

        i = tx_ring->next_to_use;
        buffer_info = &tx_ring->buffer_info[i];
        context_desc = E1000_CONTEXT_DESC(*tx_ring, i);

        context_desc->lower_setup.ip_config = 0;
        context_desc->upper_setup.tcp_fields.tucss = css;
        context_desc->upper_setup.tcp_fields.tucso =
                css + skb->csum_offset;
        context_desc->upper_setup.tcp_fields.tucse = 0;
        context_desc->tcp_seg_setup.data = 0;
        context_desc->cmd_and_length = cpu_to_le32(cmd_len);

        buffer_info->time_stamp = jiffies;
        buffer_info->next_to_watch = i;

        if (unlikely(++i == tx_ring->count))
                i = 0;

        tx_ring->next_to_use = i;

        return true;
}

#define E1000_MAX_TXD_PWR       12
#define E1000_MAX_DATA_PER_TXD  (1<<E1000_MAX_TXD_PWR)

static int e1000_tx_map(struct e1000_adapter *adapter,
                        struct e1000_tx_ring *tx_ring,
                        struct sk_buff *skb, unsigned int first,
                        unsigned int max_per_txd, unsigned int nr_frags,
                        unsigned int mss)
{
        struct e1000_hw *hw = &adapter->hw;
        struct pci_dev *pdev = adapter->pdev;
        struct e1000_tx_buffer *buffer_info;
        unsigned int len = skb_headlen(skb);
        unsigned int offset = 0, size, count = 0, i;
        unsigned int f, bytecount, segs;

        i = tx_ring->next_to_use;

        while (len) {
                buffer_info = &tx_ring->buffer_info[i];
                size = min(len, max_per_txd);
                /* Workaround for Controller erratum --
                 * descriptor for non-tso packet in a linear SKB that follows a
                 * tso gets written back prematurely before the data is fully
                 * DMA'd to the controller
                 */
                if (!skb->data_len && tx_ring->last_tx_tso &&
                    !skb_is_gso(skb)) {
                        tx_ring->last_tx_tso = false;
                        size -= 4;
                }

                /* Workaround for premature desc write-backs
                 * in TSO mode.  Append 4-byte sentinel desc
                 */
                if (unlikely(mss && !nr_frags && size == len && size > 8))
                        size -= 4;
                /* work-around for errata 10 and it applies
                 * to all controllers in PCI-X mode
                 * The fix is to make sure that the first descriptor of a
                 * packet is smaller than 2048 - 16 - 16 (or 2016) bytes
                 */
                if (unlikely((hw->bus_type == e1000_bus_type_pcix) &&
                             (size > 2015) && count == 0))
                        size = 2015;

                /* Workaround for potential 82544 hang in PCI-X.  Avoid
                 * terminating buffers within evenly-aligned dwords.
                 */
                if (unlikely(adapter->pcix_82544 &&
                   !((unsigned long)(skb->data + offset + size - 1) & 4) &&
                   size > 4))
                        size -= 4;

                buffer_info->length = size;
                /* set time_stamp *before* dma to help avoid a possible race */
                buffer_info->time_stamp = jiffies;
                buffer_info->mapped_as_page = false;
                buffer_info->dma = dma_map_single(&pdev->dev,
                                                  skb->data + offset,
                                                  size, DMA_TO_DEVICE);
                if (dma_mapping_error(&pdev->dev, buffer_info->dma))
                        goto dma_error;
                buffer_info->next_to_watch = i;

                len -= size;
                offset += size;
                count++;
                if (len) {
                        i++;
                        if (unlikely(i == tx_ring->count))
                                i = 0;
                }
        }

        for (f = 0; f < nr_frags; f++) {
                const skb_frag_t *frag = &skb_shinfo(skb)->frags[f];

                len = skb_frag_size(frag);
                offset = 0;

                while (len) {
                        unsigned long bufend;
                        i++;
                        if (unlikely(i == tx_ring->count))
                                i = 0;

                        buffer_info = &tx_ring->buffer_info[i];
                        size = min(len, max_per_txd);
                        /* Workaround for premature desc write-backs
                         * in TSO mode.  Append 4-byte sentinel desc
                         */
                        if (unlikely(mss && f == (nr_frags-1) &&
                            size == len && size > 8))
                                size -= 4;
                        /* Workaround for potential 82544 hang in PCI-X.
                         * Avoid terminating buffers within evenly-aligned
                         * dwords.
                         */
                        bufend = (unsigned long)
                                page_to_phys(skb_frag_page(frag));
                        bufend += offset + size - 1;
                        if (unlikely(adapter->pcix_82544 &&
                                     !(bufend & 4) &&
                                     size > 4))
                                size -= 4;

                        buffer_info->length = size;
                        buffer_info->time_stamp = jiffies;
                        buffer_info->mapped_as_page = true;
                        buffer_info->dma = skb_frag_dma_map(&pdev->dev, frag,
                                                offset, size, DMA_TO_DEVICE);
                        if (dma_mapping_error(&pdev->dev, buffer_info->dma))
                                goto dma_error;
                        buffer_info->next_to_watch = i;

                        len -= size;
                        offset += size;
                        count++;
                }
        }

        segs = skb_shinfo(skb)->gso_segs ?: 1;
        /* multiply data chunks by size of headers */
        bytecount = ((segs - 1) * skb_headlen(skb)) + skb->len;

        tx_ring->buffer_info[i].skb = skb;
        tx_ring->buffer_info[i].segs = segs;
        tx_ring->buffer_info[i].bytecount = bytecount;
        tx_ring->buffer_info[first].next_to_watch = i;

        return count;

dma_error:
        dev_err(&pdev->dev, "TX DMA map failed\n");
        buffer_info->dma = 0;

        while (count--) {
                if (i == 0)
                        i += tx_ring->count;
                i--;
                buffer_info = &tx_ring->buffer_info[i];
                e1000_unmap_and_free_tx_resource(adapter, buffer_info, 0);
        }

        return 0;
}

static void e1000_tx_queue(struct e1000_adapter *adapter,
                           struct e1000_tx_ring *tx_ring, int tx_flags,
                           int count)
{
        struct e1000_tx_desc *tx_desc = NULL;
        struct e1000_tx_buffer *buffer_info;
        u32 txd_upper = 0, txd_lower = E1000_TXD_CMD_IFCS;
        unsigned int i;

        if (likely(tx_flags & E1000_TX_FLAGS_TSO)) {
                txd_lower |= E1000_TXD_CMD_DEXT | E1000_TXD_DTYP_D |
                             E1000_TXD_CMD_TSE;
                txd_upper |= E1000_TXD_POPTS_TXSM << 8;

                if (likely(tx_flags & E1000_TX_FLAGS_IPV4))
                        txd_upper |= E1000_TXD_POPTS_IXSM << 8;
        }

        if (likely(tx_flags & E1000_TX_FLAGS_CSUM)) {
                txd_lower |= E1000_TXD_CMD_DEXT | E1000_TXD_DTYP_D;
                txd_upper |= E1000_TXD_POPTS_TXSM << 8;
        }

        if (unlikely(tx_flags & E1000_TX_FLAGS_VLAN)) {
                txd_lower |= E1000_TXD_CMD_VLE;
                txd_upper |= (tx_flags & E1000_TX_FLAGS_VLAN_MASK);
        }

        if (unlikely(tx_flags & E1000_TX_FLAGS_NO_FCS))
                txd_lower &= ~(E1000_TXD_CMD_IFCS);

        i = tx_ring->next_to_use;

        while (count--) {
                buffer_info = &tx_ring->buffer_info[i];
                tx_desc = E1000_TX_DESC(*tx_ring, i);
                tx_desc->buffer_addr = cpu_to_le64(buffer_info->dma);
                tx_desc->lower.data =
                        cpu_to_le32(txd_lower | buffer_info->length);
                tx_desc->upper.data = cpu_to_le32(txd_upper);
                if (unlikely(++i == tx_ring->count))
                        i = 0;
        }

        tx_desc->lower.data |= cpu_to_le32(adapter->txd_cmd);

        /* txd_cmd re-enables FCS, so we'll re-disable it here as desired. */
        if (unlikely(tx_flags & E1000_TX_FLAGS_NO_FCS))
                tx_desc->lower.data &= ~(cpu_to_le32(E1000_TXD_CMD_IFCS));

        /* Force memory writes to complete before letting h/w
         * know there are new descriptors to fetch.  (Only
         * applicable for weak-ordered memory model archs,
         * such as IA-64).
         */
        dma_wmb();

        tx_ring->next_to_use = i;
}

/* 82547 workaround to avoid controller hang in half-duplex environment.
 * The workaround is to avoid queuing a large packet that would span
 * the internal Tx FIFO ring boundary by notifying the stack to resend
 * the packet at a later time.  This gives the Tx FIFO an opportunity to
 * flush all packets.  When that occurs, we reset the Tx FIFO pointers
 * to the beginning of the Tx FIFO.
 */

#define E1000_FIFO_HDR                  0x10
#define E1000_82547_PAD_LEN             0x3E0

static int e1000_82547_fifo_workaround(struct e1000_adapter *adapter,
                                       struct sk_buff *skb)
{
        u32 fifo_space = adapter->tx_fifo_size - adapter->tx_fifo_head;
        u32 skb_fifo_len = skb->len + E1000_FIFO_HDR;

        skb_fifo_len = ALIGN(skb_fifo_len, E1000_FIFO_HDR);

        if (adapter->link_duplex != HALF_DUPLEX)
                goto no_fifo_stall_required;

        if (atomic_read(&adapter->tx_fifo_stall))
                return 1;

        if (skb_fifo_len >= (E1000_82547_PAD_LEN + fifo_space)) {
                atomic_set(&adapter->tx_fifo_stall, 1);
                return 1;
        }

no_fifo_stall_required:
        adapter->tx_fifo_head += skb_fifo_len;
        if (adapter->tx_fifo_head >= adapter->tx_fifo_size)
                adapter->tx_fifo_head -= adapter->tx_fifo_size;
        return 0;
}

static int __e1000_maybe_stop_tx(struct net_device *netdev, int size)
{
        struct e1000_adapter *adapter = netdev_priv(netdev);
        struct e1000_tx_ring *tx_ring = adapter->tx_ring;

        netif_stop_queue(netdev);
        /* Herbert's original patch had:
         *  smp_mb__after_netif_stop_queue();
         * but since that doesn't exist yet, just open code it.
         */
        smp_mb();

        /* We need to check again in a case another CPU has just
         * made room available.
         */
        if (likely(E1000_DESC_UNUSED(tx_ring) < size))
                return -EBUSY;

        /* A reprieve! */
        netif_start_queue(netdev);
        ++adapter->restart_queue;
        return 0;
}

static int e1000_maybe_stop_tx(struct net_device *netdev,
                               struct e1000_tx_ring *tx_ring, int size)
{
        if (likely(E1000_DESC_UNUSED(tx_ring) >= size))
                return 0;
        return __e1000_maybe_stop_tx(netdev, size);
}

#define TXD_USE_COUNT(S, X) (((S) + ((1 << (X)) - 1)) >> (X))
static netdev_tx_t e1000_xmit_frame(struct sk_buff *skb,
                                    struct net_device *netdev)
{
        struct e1000_adapter *adapter = netdev_priv(netdev);
        struct e1000_hw *hw = &adapter->hw;
        struct e1000_tx_ring *tx_ring;
        unsigned int first, max_per_txd = E1000_MAX_DATA_PER_TXD;
        unsigned int max_txd_pwr = E1000_MAX_TXD_PWR;
        unsigned int tx_flags = 0;
        unsigned int len = skb_headlen(skb);
        unsigned int nr_frags;
        unsigned int mss;
        int count = 0;
        int tso;
        unsigned int f;
        __be16 protocol = vlan_get_protocol(skb);

        /* This goes back to the question of how to logically map a Tx queue
         * to a flow.  Right now, performance is impacted slightly negatively
         * if using multiple Tx queues.  If the stack breaks away from a
         * single qdisc implementation, we can look at this again.
         */
        tx_ring = adapter->tx_ring;

        /* On PCI/PCI-X HW, if packet size is less than ETH_ZLEN,
         * packets may get corrupted during padding by HW.
         * To WA this issue, pad all small packets manually.
         */
        if (eth_skb_pad(skb))
                return NETDEV_TX_OK;

        mss = skb_shinfo(skb)->gso_size;
        /* The controller does a simple calculation to
         * make sure there is enough room in the FIFO before
         * initiating the DMA for each buffer.  The calc is:
         * 4 = ceil(buffer len/mss).  To make sure we don't
         * overrun the FIFO, adjust the max buffer len if mss
         * drops.
         */
        if (mss) {
                u8 hdr_len;
                max_per_txd = min(mss << 2, max_per_txd);
                max_txd_pwr = fls(max_per_txd) - 1;

                hdr_len = skb_tcp_all_headers(skb);
                if (skb->data_len && hdr_len == len) {
                        switch (hw->mac_type) {
                        case e1000_82544: {
                                unsigned int pull_size;

                                /* Make sure we have room to chop off 4 bytes,
                                 * and that the end alignment will work out to
                                 * this hardware's requirements
                                 * NOTE: this is a TSO only workaround
                                 * if end byte alignment not correct move us
                                 * into the next dword
                                 */
                                if ((unsigned long)(skb_tail_pointer(skb) - 1)
                                    & 4)
                                        break;
                                pull_size = min((unsigned int)4, skb->data_len);
                                if (!__pskb_pull_tail(skb, pull_size)) {
                                        e_err(drv, "__pskb_pull_tail "
                                              "failed.\n");
                                        dev_kfree_skb_any(skb);
                                        return NETDEV_TX_OK;
                                }
                                len = skb_headlen(skb);
                                break;
                        }
                        default:
                                /* do nothing */
                                break;
                        }
                }
        }

        /* reserve a descriptor for the offload context */
        if ((mss) || (skb->ip_summed == CHECKSUM_PARTIAL))
                count++;
        count++;

        /* Controller Erratum workaround */
        if (!skb->data_len && tx_ring->last_tx_tso && !skb_is_gso(skb))
                count++;

        count += TXD_USE_COUNT(len, max_txd_pwr);

        if (adapter->pcix_82544)
                count++;

        /* work-around for errata 10 and it applies to all controllers
         * in PCI-X mode, so add one more descriptor to the count
         */
        if (unlikely((hw->bus_type == e1000_bus_type_pcix) &&
                        (len > 2015)))
                count++;

        nr_frags = skb_shinfo(skb)->nr_frags;
        for (f = 0; f < nr_frags; f++)
                count += TXD_USE_COUNT(skb_frag_size(&skb_shinfo(skb)->frags[f]),
                                       max_txd_pwr);
        if (adapter->pcix_82544)
                count += nr_frags;

        /* need: count + 2 desc gap to keep tail from touching
         * head, otherwise try next time
         */
        if (unlikely(e1000_maybe_stop_tx(netdev, tx_ring, count + 2)))
                return NETDEV_TX_BUSY;

        if (unlikely((hw->mac_type == e1000_82547) &&
                     (e1000_82547_fifo_workaround(adapter, skb)))) {
                netif_stop_queue(netdev);
                if (!test_bit(__E1000_DOWN, &adapter->flags))
                        schedule_delayed_work(&adapter->fifo_stall_task, 1);
                return NETDEV_TX_BUSY;
        }

        if (skb_vlan_tag_present(skb)) {
                tx_flags |= E1000_TX_FLAGS_VLAN;
                tx_flags |= (skb_vlan_tag_get(skb) <<
                             E1000_TX_FLAGS_VLAN_SHIFT);
        }

        first = tx_ring->next_to_use;

        tso = e1000_tso(adapter, tx_ring, skb, protocol);
        if (tso < 0) {
                dev_kfree_skb_any(skb);
                return NETDEV_TX_OK;
        }

        if (likely(tso)) {
                if (likely(hw->mac_type != e1000_82544))
                        tx_ring->last_tx_tso = true;
                tx_flags |= E1000_TX_FLAGS_TSO;
        } else if (likely(e1000_tx_csum(adapter, tx_ring, skb, protocol)))
                tx_flags |= E1000_TX_FLAGS_CSUM;

        if (protocol == htons(ETH_P_IP))
                tx_flags |= E1000_TX_FLAGS_IPV4;

        if (unlikely(skb->no_fcs))
                tx_flags |= E1000_TX_FLAGS_NO_FCS;

        count = e1000_tx_map(adapter, tx_ring, skb, first, max_per_txd,
                             nr_frags, mss);

        if (count) {
                /* The descriptors needed is higher than other Intel drivers
                 * due to a number of workarounds.  The breakdown is below:
                 * Data descriptors: MAX_SKB_FRAGS + 1
                 * Context Descriptor: 1
                 * Keep head from touching tail: 2
                 * Workarounds: 3
                 */
                int desc_needed = MAX_SKB_FRAGS + 7;

                netdev_sent_queue(netdev, skb->len);
                skb_tx_timestamp(skb);

                e1000_tx_queue(adapter, tx_ring, tx_flags, count);

                /* 82544 potentially requires twice as many data descriptors
                 * in order to guarantee buffers don't end on evenly-aligned
                 * dwords
                 */
                if (adapter->pcix_82544)
                        desc_needed += MAX_SKB_FRAGS + 1;

                /* Make sure there is space in the ring for the next send. */
                e1000_maybe_stop_tx(netdev, tx_ring, desc_needed);

                if (!netdev_xmit_more() ||
                    netif_xmit_stopped(netdev_get_tx_queue(netdev, 0))) {
                        writel(tx_ring->next_to_use, hw->hw_addr + tx_ring->tdt);
                }
        } else {
                dev_kfree_skb_any(skb);
                tx_ring->buffer_info[first].time_stamp = 0;
                tx_ring->next_to_use = first;
        }

        return NETDEV_TX_OK;
}

#define NUM_REGS 38 /* 1 based count */
static void e1000_regdump(struct e1000_adapter *adapter)
{
        struct e1000_hw *hw = &adapter->hw;
        u32 regs[NUM_REGS];
        u32 *regs_buff = regs;
        int i = 0;

        static const char * const reg_name[] = {
                "CTRL",  "STATUS",
                "RCTL", "RDLEN", "RDH", "RDT", "RDTR",
                "TCTL", "TDBAL", "TDBAH", "TDLEN", "TDH", "TDT",
                "TIDV", "TXDCTL", "TADV", "TARC0",
                "TDBAL1", "TDBAH1", "TDLEN1", "TDH1", "TDT1",
                "TXDCTL1", "TARC1",
                "CTRL_EXT", "ERT", "RDBAL", "RDBAH",
                "TDFH", "TDFT", "TDFHS", "TDFTS", "TDFPC",
                "RDFH", "RDFT", "RDFHS", "RDFTS", "RDFPC"
        };

        regs_buff[0]  = er32(CTRL);
        regs_buff[1]  = er32(STATUS);

        regs_buff[2]  = er32(RCTL);
        regs_buff[3]  = er32(RDLEN);
        regs_buff[4]  = er32(RDH);
        regs_buff[5]  = er32(RDT);
        regs_buff[6]  = er32(RDTR);

        regs_buff[7]  = er32(TCTL);
        regs_buff[8]  = er32(TDBAL);
        regs_buff[9]  = er32(TDBAH);
        regs_buff[10] = er32(TDLEN);
        regs_buff[11] = er32(TDH);
        regs_buff[12] = er32(TDT);
        regs_buff[13] = er32(TIDV);
        regs_buff[14] = er32(TXDCTL);
        regs_buff[15] = er32(TADV);
        regs_buff[16] = er32(TARC0);

        regs_buff[17] = er32(TDBAL1);
        regs_buff[18] = er32(TDBAH1);
        regs_buff[19] = er32(TDLEN1);
        regs_buff[20] = er32(TDH1);
        regs_buff[21] = er32(TDT1);
        regs_buff[22] = er32(TXDCTL1);
        regs_buff[23] = er32(TARC1);
        regs_buff[24] = er32(CTRL_EXT);
        regs_buff[25] = er32(ERT);
        regs_buff[26] = er32(RDBAL0);
        regs_buff[27] = er32(RDBAH0);
        regs_buff[28] = er32(TDFH);
        regs_buff[29] = er32(TDFT);
        regs_buff[30] = er32(TDFHS);
        regs_buff[31] = er32(TDFTS);
        regs_buff[32] = er32(TDFPC);
        regs_buff[33] = er32(RDFH);
        regs_buff[34] = er32(RDFT);
        regs_buff[35] = er32(RDFHS);
        regs_buff[36] = er32(RDFTS);
        regs_buff[37] = er32(RDFPC);

        pr_info("Register dump\n");
        for (i = 0; i < NUM_REGS; i++)
                pr_info("%-15s  %08x\n", reg_name[i], regs_buff[i]);
}

/*
 * e1000_dump: Print registers, tx ring and rx ring
 */
static void e1000_dump(struct e1000_adapter *adapter)
{
        /* this code doesn't handle multiple rings */
        struct e1000_tx_ring *tx_ring = adapter->tx_ring;
        struct e1000_rx_ring *rx_ring = adapter->rx_ring;
        int i;

        if (!netif_msg_hw(adapter))
                return;

        /* Print Registers */
        e1000_regdump(adapter);

        /* transmit dump */
        pr_info("TX Desc ring0 dump\n");

        /* Transmit Descriptor Formats - DEXT[29] is 0 (Legacy) or 1 (Extended)
         *
         * Legacy Transmit Descriptor
         *   +--------------------------------------------------------------+
         * 0 |         Buffer Address [63:0] (Reserved on Write Back)       |
         *   +--------------------------------------------------------------+
         * 8 | Special  |    CSS     | Status |  CMD    |  CSO   |  Length  |
         *   +--------------------------------------------------------------+
         *   63       48 47        36 35    32 31     24 23    16 15        0
         *
         * Extended Context Descriptor (DTYP=0x0) for TSO or checksum offload
         *   63      48 47    40 39       32 31             16 15    8 7      0
         *   +----------------------------------------------------------------+
         * 0 |  TUCSE  | TUCS0  |   TUCSS   |     IPCSE       | IPCS0 | IPCSS |
         *   +----------------------------------------------------------------+
         * 8 |   MSS   | HDRLEN | RSV | STA | TUCMD | DTYP |      PAYLEN      |
         *   +----------------------------------------------------------------+
         *   63      48 47    40 39 36 35 32 31   24 23  20 19                0
         *
         * Extended Data Descriptor (DTYP=0x1)
         *   +----------------------------------------------------------------+
         * 0 |                     Buffer Address [63:0]                      |
         *   +----------------------------------------------------------------+
         * 8 | VLAN tag |  POPTS  | Rsvd | Status | Command | DTYP |  DTALEN  |
         *   +----------------------------------------------------------------+
         *   63       48 47     40 39  36 35    32 31     24 23  20 19        0
         */
        pr_info("Tc[desc]     [Ce CoCsIpceCoS] [MssHlRSCm0Plen] [bi->dma       ] leng  ntw timestmp         bi->skb\n");
        pr_info("Td[desc]     [address 63:0  ] [VlaPoRSCm1Dlen] [bi->dma       ] leng  ntw timestmp         bi->skb\n");

        if (!netif_msg_tx_done(adapter))
                goto rx_ring_summary;

        for (i = 0; tx_ring->desc && (i < tx_ring->count); i++) {
                struct e1000_tx_desc *tx_desc = E1000_TX_DESC(*tx_ring, i);
                struct e1000_tx_buffer *buffer_info = &tx_ring->buffer_info[i];
                struct my_u { __le64 a; __le64 b; };
                struct my_u *u = (struct my_u *)tx_desc;
                const char *type;

                if (i == tx_ring->next_to_use && i == tx_ring->next_to_clean)
                        type = "NTC/U";
                else if (i == tx_ring->next_to_use)
                        type = "NTU";
                else if (i == tx_ring->next_to_clean)
                        type = "NTC";
                else
                        type = "";

                pr_info("T%c[0x%03X]    %016llX %016llX %016llX %04X  %3X %016llX %p %s\n",
                        ((le64_to_cpu(u->b) & (1<<20)) ? 'd' : 'c'), i,
                        le64_to_cpu(u->a), le64_to_cpu(u->b),
                        (u64)buffer_info->dma, buffer_info->length,
                        buffer_info->next_to_watch,
                        (u64)buffer_info->time_stamp, buffer_info->skb, type);
        }

rx_ring_summary:
        /* receive dump */
        pr_info("\nRX Desc ring dump\n");

        /* Legacy Receive Descriptor Format
         *
         * +-----------------------------------------------------+
         * |                Buffer Address [63:0]                |
         * +-----------------------------------------------------+
         * | VLAN Tag | Errors | Status 0 | Packet csum | Length |
         * +-----------------------------------------------------+
         * 63       48 47    40 39      32 31         16 15      0
         */
        pr_info("R[desc]      [address 63:0  ] [vl er S cks ln] [bi->dma       ] [bi->skb]\n");

        if (!netif_msg_rx_status(adapter))
                goto exit;

        for (i = 0; rx_ring->desc && (i < rx_ring->count); i++) {
                struct e1000_rx_desc *rx_desc = E1000_RX_DESC(*rx_ring, i);
                struct e1000_rx_buffer *buffer_info = &rx_ring->buffer_info[i];
                struct my_u { __le64 a; __le64 b; };
                struct my_u *u = (struct my_u *)rx_desc;
                const char *type;

                if (i == rx_ring->next_to_use)
                        type = "NTU";
                else if (i == rx_ring->next_to_clean)
                        type = "NTC";
                else
                        type = "";

                pr_info("R[0x%03X]     %016llX %016llX %016llX %p %s\n",
                        i, le64_to_cpu(u->a), le64_to_cpu(u->b),
                        (u64)buffer_info->dma, buffer_info->rxbuf.data, type);
        } /* for */

        /* dump the descriptor caches */
        /* rx */
        pr_info("Rx descriptor cache in 64bit format\n");
        for (i = 0x6000; i <= 0x63FF ; i += 0x10) {
                pr_info("R%04X: %08X|%08X %08X|%08X\n",
                        i,
                        readl(adapter->hw.hw_addr + i+4),
                        readl(adapter->hw.hw_addr + i),
                        readl(adapter->hw.hw_addr + i+12),
                        readl(adapter->hw.hw_addr + i+8));
        }
        /* tx */
        pr_info("Tx descriptor cache in 64bit format\n");
        for (i = 0x7000; i <= 0x73FF ; i += 0x10) {
                pr_info("T%04X: %08X|%08X %08X|%08X\n",
                        i,
                        readl(adapter->hw.hw_addr + i+4),
                        readl(adapter->hw.hw_addr + i),
                        readl(adapter->hw.hw_addr + i+12),
                        readl(adapter->hw.hw_addr + i+8));
        }
exit:
        return;
}

/**
 * e1000_tx_timeout - Respond to a Tx Hang
 * @netdev: network interface device structure
 * @txqueue: number of the Tx queue that hung (unused)
 **/
static void e1000_tx_timeout(struct net_device *netdev, unsigned int __always_unused txqueue)
{
        struct e1000_adapter *adapter = netdev_priv(netdev);

        /* Do the reset outside of interrupt context */
        adapter->tx_timeout_count++;
        schedule_work(&adapter->reset_task);
}

static void e1000_reset_task(struct work_struct *work)
{
        struct e1000_adapter *adapter =
                container_of(work, struct e1000_adapter, reset_task);

        e_err(drv, "Reset adapter\n");
        rtnl_lock();
        e1000_reinit_locked(adapter);
        rtnl_unlock();
}

/**
 * e1000_change_mtu - Change the Maximum Transfer Unit
 * @netdev: network interface device structure
 * @new_mtu: new value for maximum frame size
 *
 * Returns 0 on success, negative on failure
 **/
static int e1000_change_mtu(struct net_device *netdev, int new_mtu)
{
        struct e1000_adapter *adapter = netdev_priv(netdev);
        struct e1000_hw *hw = &adapter->hw;
        int max_frame = new_mtu + ETH_HLEN + ETH_FCS_LEN;

        /* Adapter-specific max frame size limits. */
        switch (hw->mac_type) {
        case e1000_undefined ... e1000_82542_rev2_1:
                if (max_frame > (ETH_FRAME_LEN + ETH_FCS_LEN)) {
                        e_err(probe, "Jumbo Frames not supported.\n");
                        return -EINVAL;
                }
                break;
        default:
                /* Capable of supporting up to MAX_JUMBO_FRAME_SIZE limit. */
                break;
        }

        while (test_and_set_bit(__E1000_RESETTING, &adapter->flags))
                msleep(1);
        /* e1000_down has a dependency on max_frame_size */
        hw->max_frame_size = max_frame;
        if (netif_running(netdev)) {
                /* prevent buffers from being reallocated */
                adapter->alloc_rx_buf = e1000_alloc_dummy_rx_buffers;
                e1000_down(adapter);
        }

        /* NOTE: netdev_alloc_skb reserves 16 bytes, and typically NET_IP_ALIGN
         * means we reserve 2 more, this pushes us to allocate from the next
         * larger slab size.
         * i.e. RXBUFFER_2048 --> size-4096 slab
         * however with the new *_jumbo_rx* routines, jumbo receives will use
         * fragmented skbs
         */

        if (max_frame <= E1000_RXBUFFER_2048)
                adapter->rx_buffer_len = E1000_RXBUFFER_2048;
        else
#if (PAGE_SIZE >= E1000_RXBUFFER_16384)
                adapter->rx_buffer_len = E1000_RXBUFFER_16384;
#elif (PAGE_SIZE >= E1000_RXBUFFER_4096)
                adapter->rx_buffer_len = PAGE_SIZE;
#endif

        /* adjust allocation if LPE protects us, and we aren't using SBP */
        if (!hw->tbi_compatibility_on &&
            ((max_frame == (ETH_FRAME_LEN + ETH_FCS_LEN)) ||
             (max_frame == MAXIMUM_ETHERNET_VLAN_SIZE)))
                adapter->rx_buffer_len = MAXIMUM_ETHERNET_VLAN_SIZE;

        netdev_dbg(netdev, "changing MTU from %d to %d\n",
                   netdev->mtu, new_mtu);
        WRITE_ONCE(netdev->mtu, new_mtu);

        if (netif_running(netdev))
                e1000_up(adapter);
        else
                e1000_reset(adapter);

        clear_bit(__E1000_RESETTING, &adapter->flags);

        return 0;
}

/**
 * e1000_update_stats - Update the board statistics counters
 * @adapter: board private structure
 **/
void e1000_update_stats(struct e1000_adapter *adapter)
{
        struct net_device *netdev = adapter->netdev;
        struct e1000_hw *hw = &adapter->hw;
        struct pci_dev *pdev = adapter->pdev;
        unsigned long flags;
        u16 phy_tmp;

#define PHY_IDLE_ERROR_COUNT_MASK 0x00FF

        /* Prevent stats update while adapter is being reset, or if the pci
         * connection is down.
         */
        if (adapter->link_speed == 0)
                return;
        if (pci_channel_offline(pdev))
                return;

        spin_lock_irqsave(&adapter->stats_lock, flags);

        /* these counters are modified from e1000_tbi_adjust_stats,
         * called from the interrupt context, so they must only
         * be written while holding adapter->stats_lock
         */

        adapter->stats.crcerrs += er32(CRCERRS);
        adapter->stats.gprc += er32(GPRC);
        adapter->stats.gorcl += er32(GORCL);
        adapter->stats.gorch += er32(GORCH);
        adapter->stats.bprc += er32(BPRC);
        adapter->stats.mprc += er32(MPRC);
        adapter->stats.roc += er32(ROC);

        adapter->stats.prc64 += er32(PRC64);
        adapter->stats.prc127 += er32(PRC127);
        adapter->stats.prc255 += er32(PRC255);
        adapter->stats.prc511 += er32(PRC511);
        adapter->stats.prc1023 += er32(PRC1023);
        adapter->stats.prc1522 += er32(PRC1522);

        adapter->stats.symerrs += er32(SYMERRS);
        adapter->stats.mpc += er32(MPC);
        adapter->stats.scc += er32(SCC);
        adapter->stats.ecol += er32(ECOL);
        adapter->stats.mcc += er32(MCC);
        adapter->stats.latecol += er32(LATECOL);
        adapter->stats.dc += er32(DC);
        adapter->stats.sec += er32(SEC);
        adapter->stats.rlec += er32(RLEC);
        adapter->stats.xonrxc += er32(XONRXC);
        adapter->stats.xontxc += er32(XONTXC);
        adapter->stats.xoffrxc += er32(XOFFRXC);
        adapter->stats.xofftxc += er32(XOFFTXC);
        adapter->stats.fcruc += er32(FCRUC);
        adapter->stats.gptc += er32(GPTC);
        adapter->stats.gotcl += er32(GOTCL);
        adapter->stats.gotch += er32(GOTCH);
        adapter->stats.rnbc += er32(RNBC);
        adapter->stats.ruc += er32(RUC);
        adapter->stats.rfc += er32(RFC);
        adapter->stats.rjc += er32(RJC);
        adapter->stats.torl += er32(TORL);
        adapter->stats.torh += er32(TORH);
        adapter->stats.totl += er32(TOTL);
        adapter->stats.toth += er32(TOTH);
        adapter->stats.tpr += er32(TPR);

        adapter->stats.ptc64 += er32(PTC64);
        adapter->stats.ptc127 += er32(PTC127);
        adapter->stats.ptc255 += er32(PTC255);
        adapter->stats.ptc511 += er32(PTC511);
        adapter->stats.ptc1023 += er32(PTC1023);
        adapter->stats.ptc1522 += er32(PTC1522);

        adapter->stats.mptc += er32(MPTC);
        adapter->stats.bptc += er32(BPTC);

        /* used for adaptive IFS */

        hw->tx_packet_delta = er32(TPT);
        adapter->stats.tpt += hw->tx_packet_delta;
        hw->collision_delta = er32(COLC);
        adapter->stats.colc += hw->collision_delta;

        if (hw->mac_type >= e1000_82543) {
                adapter->stats.algnerrc += er32(ALGNERRC);
                adapter->stats.rxerrc += er32(RXERRC);
                adapter->stats.tncrs += er32(TNCRS);
                adapter->stats.cexterr += er32(CEXTERR);
                adapter->stats.tsctc += er32(TSCTC);
                adapter->stats.tsctfc += er32(TSCTFC);
        }

        /* Fill out the OS statistics structure */
        netdev->stats.multicast = adapter->stats.mprc;
        netdev->stats.collisions = adapter->stats.colc;

        /* Rx Errors */

        /* RLEC on some newer hardware can be incorrect so build
         * our own version based on RUC and ROC
         */
        netdev->stats.rx_errors = adapter->stats.rxerrc +
                adapter->stats.crcerrs + adapter->stats.algnerrc +
                adapter->stats.ruc + adapter->stats.roc +
                adapter->stats.cexterr;
        adapter->stats.rlerrc = adapter->stats.ruc + adapter->stats.roc;
        netdev->stats.rx_length_errors = adapter->stats.rlerrc;
        netdev->stats.rx_crc_errors = adapter->stats.crcerrs;
        netdev->stats.rx_frame_errors = adapter->stats.algnerrc;
        netdev->stats.rx_missed_errors = adapter->stats.mpc;

        /* Tx Errors */
        adapter->stats.txerrc = adapter->stats.ecol + adapter->stats.latecol;
        netdev->stats.tx_errors = adapter->stats.txerrc;
        netdev->stats.tx_aborted_errors = adapter->stats.ecol;
        netdev->stats.tx_window_errors = adapter->stats.latecol;
        netdev->stats.tx_carrier_errors = adapter->stats.tncrs;
        if (hw->bad_tx_carr_stats_fd &&
            adapter->link_duplex == FULL_DUPLEX) {
                netdev->stats.tx_carrier_errors = 0;
                adapter->stats.tncrs = 0;
        }

        /* Tx Dropped needs to be maintained elsewhere */

        /* Phy Stats */
        if (hw->media_type == e1000_media_type_copper) {
                if ((adapter->link_speed == SPEED_1000) &&
                   (!e1000_read_phy_reg(hw, PHY_1000T_STATUS, &phy_tmp))) {
                        phy_tmp &= PHY_IDLE_ERROR_COUNT_MASK;
                        adapter->phy_stats.idle_errors += phy_tmp;
                }

                if ((hw->mac_type <= e1000_82546) &&
                   (hw->phy_type == e1000_phy_m88) &&
                   !e1000_read_phy_reg(hw, M88E1000_RX_ERR_CNTR, &phy_tmp))
                        adapter->phy_stats.receive_errors += phy_tmp;
        }

        /* Management Stats */
        if (hw->has_smbus) {
                adapter->stats.mgptc += er32(MGTPTC);
                adapter->stats.mgprc += er32(MGTPRC);
                adapter->stats.mgpdc += er32(MGTPDC);
        }

        spin_unlock_irqrestore(&adapter->stats_lock, flags);
}

/**
 * e1000_intr - Interrupt Handler
 * @irq: interrupt number
 * @data: pointer to a network interface device structure
 **/
static irqreturn_t e1000_intr(int irq, void *data)
{
        struct net_device *netdev = data;
        struct e1000_adapter *adapter = netdev_priv(netdev);
        struct e1000_hw *hw = &adapter->hw;
        u32 icr = er32(ICR);

        if (unlikely((!icr)))
                return IRQ_NONE;  /* Not our interrupt */

        /* we might have caused the interrupt, but the above
         * read cleared it, and just in case the driver is
         * down there is nothing to do so return handled
         */
        if (unlikely(test_bit(__E1000_DOWN, &adapter->flags)))
                return IRQ_HANDLED;

        if (unlikely(icr & (E1000_ICR_RXSEQ | E1000_ICR_LSC))) {
                hw->get_link_status = 1;
                /* guard against interrupt when we're going down */
                if (!test_bit(__E1000_DOWN, &adapter->flags))
                        schedule_delayed_work(&adapter->watchdog_task, 1);
        }

        /* disable interrupts, without the synchronize_irq bit */
        ew32(IMC, ~0);
        E1000_WRITE_FLUSH();

        if (likely(napi_schedule_prep(&adapter->napi))) {
                adapter->total_tx_bytes = 0;
                adapter->total_tx_packets = 0;
                adapter->total_rx_bytes = 0;
                adapter->total_rx_packets = 0;
                __napi_schedule(&adapter->napi);
        } else {
                /* this really should not happen! if it does it is basically a
                 * bug, but not a hard error, so enable ints and continue
                 */
                if (!test_bit(__E1000_DOWN, &adapter->flags))
                        e1000_irq_enable(adapter);
        }

        return IRQ_HANDLED;
}

/**
 * e1000_clean - NAPI Rx polling callback
 * @napi: napi struct containing references to driver info
 * @budget: budget given to driver for receive packets
 **/
static int e1000_clean(struct napi_struct *napi, int budget)
{
        struct e1000_adapter *adapter = container_of(napi, struct e1000_adapter,
                                                     napi);
        int tx_clean_complete = 0, work_done = 0;

        tx_clean_complete = e1000_clean_tx_irq(adapter, &adapter->tx_ring[0]);

        adapter->clean_rx(adapter, &adapter->rx_ring[0], &work_done, budget);

        if (!tx_clean_complete || work_done == budget)
                return budget;

        /* Exit the polling mode, but don't re-enable interrupts if stack might
         * poll us due to busy-polling
         */
        if (likely(napi_complete_done(napi, work_done))) {
                if (likely(adapter->itr_setting & 3))
                        e1000_set_itr(adapter);
                if (!test_bit(__E1000_DOWN, &adapter->flags))
                        e1000_irq_enable(adapter);
        }

        return work_done;
}

/**
 * e1000_clean_tx_irq - Reclaim resources after transmit completes
 * @adapter: board private structure
 * @tx_ring: ring to clean
 **/
static bool e1000_clean_tx_irq(struct e1000_adapter *adapter,
                               struct e1000_tx_ring *tx_ring)
{
        struct e1000_hw *hw = &adapter->hw;
        struct net_device *netdev = adapter->netdev;
        struct e1000_tx_desc *tx_desc, *eop_desc;
        struct e1000_tx_buffer *buffer_info;
        unsigned int i, eop;
        unsigned int count = 0;
        unsigned int total_tx_bytes = 0, total_tx_packets = 0;
        unsigned int bytes_compl = 0, pkts_compl = 0;

        i = tx_ring->next_to_clean;
        eop = tx_ring->buffer_info[i].next_to_watch;
        eop_desc = E1000_TX_DESC(*tx_ring, eop);

        while ((eop_desc->upper.data & cpu_to_le32(E1000_TXD_STAT_DD)) &&
               (count < tx_ring->count)) {
                bool cleaned = false;
                dma_rmb();      /* read buffer_info after eop_desc */
                for ( ; !cleaned; count++) {
                        tx_desc = E1000_TX_DESC(*tx_ring, i);
                        buffer_info = &tx_ring->buffer_info[i];
                        cleaned = (i == eop);

                        if (cleaned) {
                                total_tx_packets += buffer_info->segs;
                                total_tx_bytes += buffer_info->bytecount;
                                if (buffer_info->skb) {
                                        bytes_compl += buffer_info->skb->len;
                                        pkts_compl++;
                                }

                        }
                        e1000_unmap_and_free_tx_resource(adapter, buffer_info,
                                                         64);
                        tx_desc->upper.data = 0;

                        if (unlikely(++i == tx_ring->count))
                                i = 0;
                }

                eop = tx_ring->buffer_info[i].next_to_watch;
                eop_desc = E1000_TX_DESC(*tx_ring, eop);
        }

        /* Synchronize with E1000_DESC_UNUSED called from e1000_xmit_frame,
         * which will reuse the cleaned buffers.
         */
        smp_store_release(&tx_ring->next_to_clean, i);

        netdev_completed_queue(netdev, pkts_compl, bytes_compl);

#define TX_WAKE_THRESHOLD 32
        if (unlikely(count && netif_carrier_ok(netdev) &&
                     E1000_DESC_UNUSED(tx_ring) >= TX_WAKE_THRESHOLD)) {
                /* Make sure that anybody stopping the queue after this
                 * sees the new next_to_clean.
                 */
                smp_mb();

                if (netif_queue_stopped(netdev) &&
                    !(test_bit(__E1000_DOWN, &adapter->flags))) {
                        netif_wake_queue(netdev);
                        ++adapter->restart_queue;
                }
        }

        if (adapter->detect_tx_hung) {
                /* Detect a transmit hang in hardware, this serializes the
                 * check with the clearing of time_stamp and movement of i
                 */
                adapter->detect_tx_hung = false;
                if (tx_ring->buffer_info[eop].time_stamp &&
                    time_after(jiffies, tx_ring->buffer_info[eop].time_stamp +
                               (adapter->tx_timeout_factor * HZ)) &&
                    !(er32(STATUS) & E1000_STATUS_TXOFF)) {

                        /* detected Tx unit hang */
                        e_err(drv, "Detected Tx Unit Hang\n"
                              "  Tx Queue             <%lu>\n"
                              "  TDH                  <%x>\n"
                              "  TDT                  <%x>\n"
                              "  next_to_use          <%x>\n"
                              "  next_to_clean        <%x>\n"
                              "buffer_info[next_to_clean]\n"
                              "  time_stamp           <%lx>\n"
                              "  next_to_watch        <%x>\n"
                              "  jiffies              <%lx>\n"
                              "  next_to_watch.status <%x>\n",
                                (unsigned long)(tx_ring - adapter->tx_ring),
                                readl(hw->hw_addr + tx_ring->tdh),
                                readl(hw->hw_addr + tx_ring->tdt),
                                tx_ring->next_to_use,
                                tx_ring->next_to_clean,
                                tx_ring->buffer_info[eop].time_stamp,
                                eop,
                                jiffies,
                                eop_desc->upper.fields.status);
                        e1000_dump(adapter);
                        netif_stop_queue(netdev);
                }
        }
        adapter->total_tx_bytes += total_tx_bytes;
        adapter->total_tx_packets += total_tx_packets;
        netdev->stats.tx_bytes += total_tx_bytes;
        netdev->stats.tx_packets += total_tx_packets;
        return count < tx_ring->count;
}

/**
 * e1000_rx_checksum - Receive Checksum Offload for 82543
 * @adapter:     board private structure
 * @status_err:  receive descriptor status and error fields
 * @csum:        receive descriptor csum field
 * @skb:         socket buffer with received data
 **/
static void e1000_rx_checksum(struct e1000_adapter *adapter, u32 status_err,
                              u32 csum, struct sk_buff *skb)
{
        struct e1000_hw *hw = &adapter->hw;
        u16 status = (u16)status_err;
        u8 errors = (u8)(status_err >> 24);

        skb_checksum_none_assert(skb);

        /* 82543 or newer only */
        if (unlikely(hw->mac_type < e1000_82543))
                return;
        /* Ignore Checksum bit is set */
        if (unlikely(status & E1000_RXD_STAT_IXSM))
                return;
        /* TCP/UDP checksum error bit is set */
        if (unlikely(errors & E1000_RXD_ERR_TCPE)) {
                /* let the stack verify checksum errors */
                adapter->hw_csum_err++;
                return;
        }
        /* TCP/UDP Checksum has not been calculated */
        if (!(status & E1000_RXD_STAT_TCPCS))
                return;

        /* It must be a TCP or UDP packet with a valid checksum */
        if (likely(status & E1000_RXD_STAT_TCPCS)) {
                /* TCP checksum is good */
                skb->ip_summed = CHECKSUM_UNNECESSARY;
        }
        adapter->hw_csum_good++;
}

/**
 * e1000_consume_page - helper function for jumbo Rx path
 * @bi: software descriptor shadow data
 * @skb: skb being modified
 * @length: length of data being added
 **/
static void e1000_consume_page(struct e1000_rx_buffer *bi, struct sk_buff *skb,
                               u16 length)
{
        bi->rxbuf.page = NULL;
        skb->len += length;
        skb->data_len += length;
        skb->truesize += PAGE_SIZE;
}

/**
 * e1000_receive_skb - helper function to handle rx indications
 * @adapter: board private structure
 * @status: descriptor status field as written by hardware
 * @vlan: descriptor vlan field as written by hardware (no le/be conversion)
 * @skb: pointer to sk_buff to be indicated to stack
 */
static void e1000_receive_skb(struct e1000_adapter *adapter, u8 status,
                              __le16 vlan, struct sk_buff *skb)
{
        skb->protocol = eth_type_trans(skb, adapter->netdev);

        if (status & E1000_RXD_STAT_VP) {
                u16 vid = le16_to_cpu(vlan) & E1000_RXD_SPC_VLAN_MASK;

                __vlan_hwaccel_put_tag(skb, htons(ETH_P_8021Q), vid);
        }
        napi_gro_receive(&adapter->napi, skb);
}

/**
 * e1000_tbi_adjust_stats
 * @hw: Struct containing variables accessed by shared code
 * @stats: point to stats struct
 * @frame_len: The length of the frame in question
 * @mac_addr: The Ethernet destination address of the frame in question
 *
 * Adjusts the statistic counters when a frame is accepted by TBI_ACCEPT
 */
static void e1000_tbi_adjust_stats(struct e1000_hw *hw,
                                   struct e1000_hw_stats *stats,
                                   u32 frame_len, const u8 *mac_addr)
{
        u64 carry_bit;

        /* First adjust the frame length. */
        frame_len--;
        /* We need to adjust the statistics counters, since the hardware
         * counters overcount this packet as a CRC error and undercount
         * the packet as a good packet
         */
        /* This packet should not be counted as a CRC error. */
        stats->crcerrs--;
        /* This packet does count as a Good Packet Received. */
        stats->gprc++;

        /* Adjust the Good Octets received counters */
        carry_bit = 0x80000000 & stats->gorcl;
        stats->gorcl += frame_len;
        /* If the high bit of Gorcl (the low 32 bits of the Good Octets
         * Received Count) was one before the addition,
         * AND it is zero after, then we lost the carry out,
         * need to add one to Gorch (Good Octets Received Count High).
         * This could be simplified if all environments supported
         * 64-bit integers.
         */
        if (carry_bit && ((stats->gorcl & 0x80000000) == 0))
                stats->gorch++;
        /* Is this a broadcast or multicast?  Check broadcast first,
         * since the test for a multicast frame will test positive on
         * a broadcast frame.
         */
        if (is_broadcast_ether_addr(mac_addr))
                stats->bprc++;
        else if (is_multicast_ether_addr(mac_addr))
                stats->mprc++;

        if (frame_len == hw->max_frame_size) {
                /* In this case, the hardware has overcounted the number of
                 * oversize frames.
                 */
                if (stats->roc > 0)
                        stats->roc--;
        }

        /* Adjust the bin counters when the extra byte put the frame in the
         * wrong bin. Remember that the frame_len was adjusted above.
         */
        if (frame_len == 64) {
                stats->prc64++;
                stats->prc127--;
        } else if (frame_len == 127) {
                stats->prc127++;
                stats->prc255--;
        } else if (frame_len == 255) {
                stats->prc255++;
                stats->prc511--;
        } else if (frame_len == 511) {
                stats->prc511++;
                stats->prc1023--;
        } else if (frame_len == 1023) {
                stats->prc1023++;
                stats->prc1522--;
        } else if (frame_len == 1522) {
                stats->prc1522++;
        }
}

static bool e1000_tbi_should_accept(struct e1000_adapter *adapter,
                                    u8 status, u8 errors,
                                    u32 length, const u8 *data)
{
        struct e1000_hw *hw = &adapter->hw;
        u8 last_byte;

        /* Guard against OOB on data[length - 1] */
        if (unlikely(!length))
                return false;
        /* Upper bound: length must not exceed rx_buffer_len */
        if (unlikely(length > adapter->rx_buffer_len))
                return false;
        last_byte = *(data + length - 1);

        if (TBI_ACCEPT(hw, status, errors, length, last_byte)) {
                unsigned long irq_flags;

                spin_lock_irqsave(&adapter->stats_lock, irq_flags);
                e1000_tbi_adjust_stats(hw, &adapter->stats, length, data);
                spin_unlock_irqrestore(&adapter->stats_lock, irq_flags);

                return true;
        }

        return false;
}

static struct sk_buff *e1000_alloc_rx_skb(struct e1000_adapter *adapter,
                                          unsigned int bufsz)
{
        struct sk_buff *skb = napi_alloc_skb(&adapter->napi, bufsz);

        if (unlikely(!skb))
                adapter->alloc_rx_buff_failed++;
        return skb;
}

/**
 * e1000_clean_jumbo_rx_irq - Send received data up the network stack; legacy
 * @adapter: board private structure
 * @rx_ring: ring to clean
 * @work_done: amount of napi work completed this call
 * @work_to_do: max amount of work allowed for this call to do
 *
 * the return value indicates whether actual cleaning was done, there
 * is no guarantee that everything was cleaned
 */
static bool e1000_clean_jumbo_rx_irq(struct e1000_adapter *adapter,
                                     struct e1000_rx_ring *rx_ring,
                                     int *work_done, int work_to_do)
{
        struct net_device *netdev = adapter->netdev;
        struct pci_dev *pdev = adapter->pdev;
        struct e1000_rx_desc *rx_desc, *next_rxd;
        struct e1000_rx_buffer *buffer_info, *next_buffer;
        u32 length;
        unsigned int i;
        int cleaned_count = 0;
        bool cleaned = false;
        unsigned int total_rx_bytes = 0, total_rx_packets = 0;

        i = rx_ring->next_to_clean;
        rx_desc = E1000_RX_DESC(*rx_ring, i);
        buffer_info = &rx_ring->buffer_info[i];

        while (rx_desc->status & E1000_RXD_STAT_DD) {
                struct sk_buff *skb;
                u8 status;

                if (*work_done >= work_to_do)
                        break;
                (*work_done)++;
                dma_rmb(); /* read descriptor and rx_buffer_info after status DD */

                status = rx_desc->status;

                if (++i == rx_ring->count)
                        i = 0;

                next_rxd = E1000_RX_DESC(*rx_ring, i);
                prefetch(next_rxd);

                next_buffer = &rx_ring->buffer_info[i];

                cleaned = true;
                cleaned_count++;
                dma_unmap_page(&pdev->dev, buffer_info->dma,
                               adapter->rx_buffer_len, DMA_FROM_DEVICE);
                buffer_info->dma = 0;

                length = le16_to_cpu(rx_desc->length);

                /* errors is only valid for DD + EOP descriptors */
                if (unlikely((status & E1000_RXD_STAT_EOP) &&
                    (rx_desc->errors & E1000_RXD_ERR_FRAME_ERR_MASK))) {
                        u8 *mapped = page_address(buffer_info->rxbuf.page);

                        if (e1000_tbi_should_accept(adapter, status,
                                                    rx_desc->errors,
                                                    length, mapped)) {
                                length--;
                        } else if (netdev->features & NETIF_F_RXALL) {
                                goto process_skb;
                        } else {
                                /* an error means any chain goes out the window
                                 * too
                                 */
                                dev_kfree_skb(rx_ring->rx_skb_top);
                                rx_ring->rx_skb_top = NULL;
                                goto next_desc;
                        }
                }

#define rxtop rx_ring->rx_skb_top
process_skb:
                if (!(status & E1000_RXD_STAT_EOP)) {
                        /* this descriptor is only the beginning (or middle) */
                        if (!rxtop) {
                                /* this is the beginning of a chain */
                                rxtop = napi_get_frags(&adapter->napi);
                                if (!rxtop)
                                        break;

                                skb_fill_page_desc(rxtop, 0,
                                                   buffer_info->rxbuf.page,
                                                   0, length);
                        } else {
                                /* this is the middle of a chain */
                                skb_fill_page_desc(rxtop,
                                    skb_shinfo(rxtop)->nr_frags,
                                    buffer_info->rxbuf.page, 0, length);
                        }
                        e1000_consume_page(buffer_info, rxtop, length);
                        goto next_desc;
                } else {
                        if (rxtop) {
                                /* end of the chain */
                                skb_fill_page_desc(rxtop,
                                    skb_shinfo(rxtop)->nr_frags,
                                    buffer_info->rxbuf.page, 0, length);
                                skb = rxtop;
                                rxtop = NULL;
                                e1000_consume_page(buffer_info, skb, length);
                        } else {
                                struct page *p;
                                /* no chain, got EOP, this buf is the packet
                                 * copybreak to save the put_page/alloc_page
                                 */
                                p = buffer_info->rxbuf.page;
                                if (length <= copybreak) {
                                        if (likely(!(netdev->features & NETIF_F_RXFCS)))
                                                length -= 4;
                                        skb = e1000_alloc_rx_skb(adapter,
                                                                 length);
                                        if (!skb)
                                                break;

                                        memcpy(skb_tail_pointer(skb),
                                               page_address(p), length);

                                        /* re-use the page, so don't erase
                                         * buffer_info->rxbuf.page
                                         */
                                        skb_put(skb, length);
                                        e1000_rx_checksum(adapter,
                                                          status | rx_desc->errors << 24,
                                                          le16_to_cpu(rx_desc->csum), skb);

                                        total_rx_bytes += skb->len;
                                        total_rx_packets++;

                                        e1000_receive_skb(adapter, status,
                                                          rx_desc->special, skb);
                                        goto next_desc;
                                } else {
                                        skb = napi_get_frags(&adapter->napi);
                                        if (!skb) {
                                                adapter->alloc_rx_buff_failed++;
                                                break;
                                        }
                                        skb_fill_page_desc(skb, 0, p, 0,
                                                           length);
                                        e1000_consume_page(buffer_info, skb,
                                                           length);
                                }
                        }
                }

                /* Receive Checksum Offload XXX recompute due to CRC strip? */
                e1000_rx_checksum(adapter,
                                  (u32)(status) |
                                  ((u32)(rx_desc->errors) << 24),
                                  le16_to_cpu(rx_desc->csum), skb);

                total_rx_bytes += (skb->len - 4); /* don't count FCS */
                if (likely(!(netdev->features & NETIF_F_RXFCS)))
                        pskb_trim(skb, skb->len - 4);
                total_rx_packets++;

                if (status & E1000_RXD_STAT_VP) {
                        __le16 vlan = rx_desc->special;
                        u16 vid = le16_to_cpu(vlan) & E1000_RXD_SPC_VLAN_MASK;

                        __vlan_hwaccel_put_tag(skb, htons(ETH_P_8021Q), vid);
                }

                napi_gro_frags(&adapter->napi);

next_desc:
                rx_desc->status = 0;

                /* return some buffers to hardware, one at a time is too slow */
                if (unlikely(cleaned_count >= E1000_RX_BUFFER_WRITE)) {
                        adapter->alloc_rx_buf(adapter, rx_ring, cleaned_count);
                        cleaned_count = 0;
                }

                /* use prefetched values */
                rx_desc = next_rxd;
                buffer_info = next_buffer;
        }
        rx_ring->next_to_clean = i;

        cleaned_count = E1000_DESC_UNUSED(rx_ring);
        if (cleaned_count)
                adapter->alloc_rx_buf(adapter, rx_ring, cleaned_count);

        adapter->total_rx_packets += total_rx_packets;
        adapter->total_rx_bytes += total_rx_bytes;
        netdev->stats.rx_bytes += total_rx_bytes;
        netdev->stats.rx_packets += total_rx_packets;
        return cleaned;
}

/* this should improve performance for small packets with large amounts
 * of reassembly being done in the stack
 */
static struct sk_buff *e1000_copybreak(struct e1000_adapter *adapter,
                                       struct e1000_rx_buffer *buffer_info,
                                       u32 length, const void *data)
{
        struct sk_buff *skb;

        if (length > copybreak)
                return NULL;

        skb = e1000_alloc_rx_skb(adapter, length);
        if (!skb)
                return NULL;

        dma_sync_single_for_cpu(&adapter->pdev->dev, buffer_info->dma,
                                length, DMA_FROM_DEVICE);

        skb_put_data(skb, data, length);

        return skb;
}

/**
 * e1000_clean_rx_irq - Send received data up the network stack; legacy
 * @adapter: board private structure
 * @rx_ring: ring to clean
 * @work_done: amount of napi work completed this call
 * @work_to_do: max amount of work allowed for this call to do
 */
static bool e1000_clean_rx_irq(struct e1000_adapter *adapter,
                               struct e1000_rx_ring *rx_ring,
                               int *work_done, int work_to_do)
{
        struct net_device *netdev = adapter->netdev;
        struct pci_dev *pdev = adapter->pdev;
        struct e1000_rx_desc *rx_desc, *next_rxd;
        struct e1000_rx_buffer *buffer_info, *next_buffer;
        u32 length;
        unsigned int i;
        int cleaned_count = 0;
        bool cleaned = false;
        unsigned int total_rx_bytes = 0, total_rx_packets = 0;

        i = rx_ring->next_to_clean;
        rx_desc = E1000_RX_DESC(*rx_ring, i);
        buffer_info = &rx_ring->buffer_info[i];

        while (rx_desc->status & E1000_RXD_STAT_DD) {
                struct sk_buff *skb;
                u8 *data;
                u8 status;

                if (*work_done >= work_to_do)
                        break;
                (*work_done)++;
                dma_rmb(); /* read descriptor and rx_buffer_info after status DD */

                status = rx_desc->status;
                length = le16_to_cpu(rx_desc->length);

                data = buffer_info->rxbuf.data;
                prefetch(data);
                skb = e1000_copybreak(adapter, buffer_info, length, data);
                if (!skb) {
                        unsigned int frag_len = e1000_frag_len(adapter);

                        skb = napi_build_skb(data - E1000_HEADROOM, frag_len);
                        if (!skb) {
                                adapter->alloc_rx_buff_failed++;
                                break;
                        }

                        skb_reserve(skb, E1000_HEADROOM);
                        dma_unmap_single(&pdev->dev, buffer_info->dma,
                                         adapter->rx_buffer_len,
                                         DMA_FROM_DEVICE);
                        buffer_info->dma = 0;
                        buffer_info->rxbuf.data = NULL;
                }

                if (++i == rx_ring->count)
                        i = 0;

                next_rxd = E1000_RX_DESC(*rx_ring, i);
                prefetch(next_rxd);

                next_buffer = &rx_ring->buffer_info[i];

                cleaned = true;
                cleaned_count++;

                /* !EOP means multiple descriptors were used to store a single
                 * packet, if thats the case we need to toss it.  In fact, we
                 * to toss every packet with the EOP bit clear and the next
                 * frame that _does_ have the EOP bit set, as it is by
                 * definition only a frame fragment
                 */
                if (unlikely(!(status & E1000_RXD_STAT_EOP)))
                        adapter->discarding = true;

                if (adapter->discarding) {
                        /* All receives must fit into a single buffer */
                        netdev_dbg(netdev, "Receive packet consumed multiple buffers\n");
                        dev_kfree_skb(skb);
                        if (status & E1000_RXD_STAT_EOP)
                                adapter->discarding = false;
                        goto next_desc;
                }

                if (unlikely(rx_desc->errors & E1000_RXD_ERR_FRAME_ERR_MASK)) {
                        if (e1000_tbi_should_accept(adapter, status,
                                                    rx_desc->errors,
                                                    length, data)) {
                                length--;
                        } else if (netdev->features & NETIF_F_RXALL) {
                                goto process_skb;
                        } else {
                                dev_kfree_skb(skb);
                                goto next_desc;
                        }
                }

process_skb:
                total_rx_bytes += (length - 4); /* don't count FCS */
                total_rx_packets++;

                if (likely(!(netdev->features & NETIF_F_RXFCS)))
                        /* adjust length to remove Ethernet CRC, this must be
                         * done after the TBI_ACCEPT workaround above
                         */
                        length -= 4;

                if (buffer_info->rxbuf.data == NULL)
                        skb_put(skb, length);
                else /* copybreak skb */
                        skb_trim(skb, length);

                /* Receive Checksum Offload */
                e1000_rx_checksum(adapter,
                                  (u32)(status) |
                                  ((u32)(rx_desc->errors) << 24),
                                  le16_to_cpu(rx_desc->csum), skb);

                e1000_receive_skb(adapter, status, rx_desc->special, skb);

next_desc:
                rx_desc->status = 0;

                /* return some buffers to hardware, one at a time is too slow */
                if (unlikely(cleaned_count >= E1000_RX_BUFFER_WRITE)) {
                        adapter->alloc_rx_buf(adapter, rx_ring, cleaned_count);
                        cleaned_count = 0;
                }

                /* use prefetched values */
                rx_desc = next_rxd;
                buffer_info = next_buffer;
        }
        rx_ring->next_to_clean = i;

        cleaned_count = E1000_DESC_UNUSED(rx_ring);
        if (cleaned_count)
                adapter->alloc_rx_buf(adapter, rx_ring, cleaned_count);

        adapter->total_rx_packets += total_rx_packets;
        adapter->total_rx_bytes += total_rx_bytes;
        netdev->stats.rx_bytes += total_rx_bytes;
        netdev->stats.rx_packets += total_rx_packets;
        return cleaned;
}

/**
 * e1000_alloc_jumbo_rx_buffers - Replace used jumbo receive buffers
 * @adapter: address of board private structure
 * @rx_ring: pointer to receive ring structure
 * @cleaned_count: number of buffers to allocate this pass
 **/
static void
e1000_alloc_jumbo_rx_buffers(struct e1000_adapter *adapter,
                             struct e1000_rx_ring *rx_ring, int cleaned_count)
{
        struct pci_dev *pdev = adapter->pdev;
        struct e1000_rx_desc *rx_desc;
        struct e1000_rx_buffer *buffer_info;
        unsigned int i;

        i = rx_ring->next_to_use;
        buffer_info = &rx_ring->buffer_info[i];

        while (cleaned_count--) {
                /* allocate a new page if necessary */
                if (!buffer_info->rxbuf.page) {
                        buffer_info->rxbuf.page = alloc_page(GFP_ATOMIC);
                        if (unlikely(!buffer_info->rxbuf.page)) {
                                adapter->alloc_rx_buff_failed++;
                                break;
                        }
                }

                if (!buffer_info->dma) {
                        buffer_info->dma = dma_map_page(&pdev->dev,
                                                        buffer_info->rxbuf.page, 0,
                                                        adapter->rx_buffer_len,
                                                        DMA_FROM_DEVICE);
                        if (dma_mapping_error(&pdev->dev, buffer_info->dma)) {
                                put_page(buffer_info->rxbuf.page);
                                buffer_info->rxbuf.page = NULL;
                                buffer_info->dma = 0;
                                adapter->alloc_rx_buff_failed++;
                                break;
                        }
                }

                rx_desc = E1000_RX_DESC(*rx_ring, i);
                rx_desc->buffer_addr = cpu_to_le64(buffer_info->dma);

                if (unlikely(++i == rx_ring->count))
                        i = 0;
                buffer_info = &rx_ring->buffer_info[i];
        }

        if (likely(rx_ring->next_to_use != i)) {
                rx_ring->next_to_use = i;
                if (unlikely(i-- == 0))
                        i = (rx_ring->count - 1);

                /* Force memory writes to complete before letting h/w
                 * know there are new descriptors to fetch.  (Only
                 * applicable for weak-ordered memory model archs,
                 * such as IA-64).
                 */
                dma_wmb();
                writel(i, adapter->hw.hw_addr + rx_ring->rdt);
        }
}

/**
 * e1000_alloc_rx_buffers - Replace used receive buffers; legacy & extended
 * @adapter: address of board private structure
 * @rx_ring: pointer to ring struct
 * @cleaned_count: number of new Rx buffers to try to allocate
 **/
static void e1000_alloc_rx_buffers(struct e1000_adapter *adapter,
                                   struct e1000_rx_ring *rx_ring,
                                   int cleaned_count)
{
        struct e1000_hw *hw = &adapter->hw;
        struct pci_dev *pdev = adapter->pdev;
        struct e1000_rx_desc *rx_desc;
        struct e1000_rx_buffer *buffer_info;
        unsigned int i;
        unsigned int bufsz = adapter->rx_buffer_len;

        i = rx_ring->next_to_use;
        buffer_info = &rx_ring->buffer_info[i];

        while (cleaned_count--) {
                void *data;

                if (buffer_info->rxbuf.data)
                        goto skip;

                data = e1000_alloc_frag(adapter);
                if (!data) {
                        /* Better luck next round */
                        adapter->alloc_rx_buff_failed++;
                        break;
                }

                /* Fix for errata 23, can't cross 64kB boundary */
                if (!e1000_check_64k_bound(adapter, data, bufsz)) {
                        void *olddata = data;
                        e_err(rx_err, "skb align check failed: %u bytes at "
                              "%p\n", bufsz, data);
                        /* Try again, without freeing the previous */
                        data = e1000_alloc_frag(adapter);
                        /* Failed allocation, critical failure */
                        if (!data) {
                                skb_free_frag(olddata);
                                adapter->alloc_rx_buff_failed++;
                                break;
                        }

                        if (!e1000_check_64k_bound(adapter, data, bufsz)) {
                                /* give up */
                                skb_free_frag(data);
                                skb_free_frag(olddata);
                                adapter->alloc_rx_buff_failed++;
                                break;
                        }

                        /* Use new allocation */
                        skb_free_frag(olddata);
                }
                buffer_info->dma = dma_map_single(&pdev->dev,
                                                  data,
                                                  adapter->rx_buffer_len,
                                                  DMA_FROM_DEVICE);
                if (dma_mapping_error(&pdev->dev, buffer_info->dma)) {
                        skb_free_frag(data);
                        buffer_info->dma = 0;
                        adapter->alloc_rx_buff_failed++;
                        break;
                }

                /* XXX if it was allocated cleanly it will never map to a
                 * boundary crossing
                 */

                /* Fix for errata 23, can't cross 64kB boundary */
                if (!e1000_check_64k_bound(adapter,
                                        (void *)(unsigned long)buffer_info->dma,
                                        adapter->rx_buffer_len)) {
                        e_err(rx_err, "dma align check failed: %u bytes at "
                              "%p\n", adapter->rx_buffer_len,
                              (void *)(unsigned long)buffer_info->dma);

                        dma_unmap_single(&pdev->dev, buffer_info->dma,
                                         adapter->rx_buffer_len,
                                         DMA_FROM_DEVICE);

                        skb_free_frag(data);
                        buffer_info->rxbuf.data = NULL;
                        buffer_info->dma = 0;

                        adapter->alloc_rx_buff_failed++;
                        break;
                }
                buffer_info->rxbuf.data = data;
 skip:
                rx_desc = E1000_RX_DESC(*rx_ring, i);
                rx_desc->buffer_addr = cpu_to_le64(buffer_info->dma);

                if (unlikely(++i == rx_ring->count))
                        i = 0;
                buffer_info = &rx_ring->buffer_info[i];
        }

        if (likely(rx_ring->next_to_use != i)) {
                rx_ring->next_to_use = i;
                if (unlikely(i-- == 0))
                        i = (rx_ring->count - 1);

                /* Force memory writes to complete before letting h/w
                 * know there are new descriptors to fetch.  (Only
                 * applicable for weak-ordered memory model archs,
                 * such as IA-64).
                 */
                dma_wmb();
                writel(i, hw->hw_addr + rx_ring->rdt);
        }
}

/**
 * e1000_smartspeed - Workaround for SmartSpeed on 82541 and 82547 controllers.
 * @adapter: address of board private structure
 **/
static void e1000_smartspeed(struct e1000_adapter *adapter)
{
        struct e1000_hw *hw = &adapter->hw;
        u16 phy_status;
        u16 phy_ctrl;

        if ((hw->phy_type != e1000_phy_igp) || !hw->autoneg ||
           !(hw->autoneg_advertised & ADVERTISE_1000_FULL))
                return;

        if (adapter->smartspeed == 0) {
                /* If Master/Slave config fault is asserted twice,
                 * we assume back-to-back
                 */
                e1000_read_phy_reg(hw, PHY_1000T_STATUS, &phy_status);
                if (!(phy_status & SR_1000T_MS_CONFIG_FAULT))
                        return;
                e1000_read_phy_reg(hw, PHY_1000T_STATUS, &phy_status);
                if (!(phy_status & SR_1000T_MS_CONFIG_FAULT))
                        return;
                e1000_read_phy_reg(hw, PHY_1000T_CTRL, &phy_ctrl);
                if (phy_ctrl & CR_1000T_MS_ENABLE) {
                        phy_ctrl &= ~CR_1000T_MS_ENABLE;
                        e1000_write_phy_reg(hw, PHY_1000T_CTRL,
                                            phy_ctrl);
                        adapter->smartspeed++;
                        if (!e1000_phy_setup_autoneg(hw) &&
                           !e1000_read_phy_reg(hw, PHY_CTRL,
                                               &phy_ctrl)) {
                                phy_ctrl |= (MII_CR_AUTO_NEG_EN |
                                             MII_CR_RESTART_AUTO_NEG);
                                e1000_write_phy_reg(hw, PHY_CTRL,
                                                    phy_ctrl);
                        }
                }
                return;
        } else if (adapter->smartspeed == E1000_SMARTSPEED_DOWNSHIFT) {
                /* If still no link, perhaps using 2/3 pair cable */
                e1000_read_phy_reg(hw, PHY_1000T_CTRL, &phy_ctrl);
                phy_ctrl |= CR_1000T_MS_ENABLE;
                e1000_write_phy_reg(hw, PHY_1000T_CTRL, phy_ctrl);
                if (!e1000_phy_setup_autoneg(hw) &&
                   !e1000_read_phy_reg(hw, PHY_CTRL, &phy_ctrl)) {
                        phy_ctrl |= (MII_CR_AUTO_NEG_EN |
                                     MII_CR_RESTART_AUTO_NEG);
                        e1000_write_phy_reg(hw, PHY_CTRL, phy_ctrl);
                }
        }
        /* Restart process after E1000_SMARTSPEED_MAX iterations */
        if (adapter->smartspeed++ == E1000_SMARTSPEED_MAX)
                adapter->smartspeed = 0;
}

/**
 * e1000_ioctl - handle ioctl calls
 * @netdev: pointer to our netdev
 * @ifr: pointer to interface request structure
 * @cmd: ioctl data
 **/
static int e1000_ioctl(struct net_device *netdev, struct ifreq *ifr, int cmd)
{
        switch (cmd) {
        case SIOCGMIIPHY:
        case SIOCGMIIREG:
        case SIOCSMIIREG:
                return e1000_mii_ioctl(netdev, ifr, cmd);
        default:
                return -EOPNOTSUPP;
        }
}

/**
 * e1000_mii_ioctl -
 * @netdev: pointer to our netdev
 * @ifr: pointer to interface request structure
 * @cmd: ioctl data
 **/
static int e1000_mii_ioctl(struct net_device *netdev, struct ifreq *ifr,
                           int cmd)
{
        struct e1000_adapter *adapter = netdev_priv(netdev);
        struct e1000_hw *hw = &adapter->hw;
        struct mii_ioctl_data *data = if_mii(ifr);
        int retval;
        u16 mii_reg;
        unsigned long flags;

        if (hw->media_type != e1000_media_type_copper)
                return -EOPNOTSUPP;

        switch (cmd) {
        case SIOCGMIIPHY:
                data->phy_id = hw->phy_addr;
                break;
        case SIOCGMIIREG:
                spin_lock_irqsave(&adapter->stats_lock, flags);
                if (e1000_read_phy_reg(hw, data->reg_num & 0x1F,
                                   &data->val_out)) {
                        spin_unlock_irqrestore(&adapter->stats_lock, flags);
                        return -EIO;
                }
                spin_unlock_irqrestore(&adapter->stats_lock, flags);
                break;
        case SIOCSMIIREG:
                if (data->reg_num & ~(0x1F))
                        return -EFAULT;
                mii_reg = data->val_in;
                spin_lock_irqsave(&adapter->stats_lock, flags);
                if (e1000_write_phy_reg(hw, data->reg_num,
                                        mii_reg)) {
                        spin_unlock_irqrestore(&adapter->stats_lock, flags);
                        return -EIO;
                }
                spin_unlock_irqrestore(&adapter->stats_lock, flags);
                if (hw->media_type == e1000_media_type_copper) {
                        switch (data->reg_num) {
                        case PHY_CTRL:
                                if (mii_reg & MII_CR_POWER_DOWN)
                                        break;
                                if (mii_reg & MII_CR_AUTO_NEG_EN) {
                                        hw->autoneg = 1;
                                        hw->autoneg_advertised = 0x2F;
                                } else {
                                        u32 speed;
                                        if (mii_reg & 0x40)
                                                speed = SPEED_1000;
                                        else if (mii_reg & 0x2000)
                                                speed = SPEED_100;
                                        else
                                                speed = SPEED_10;
                                        retval = e1000_set_spd_dplx(
                                                adapter, speed,
                                                ((mii_reg & 0x100)
                                                 ? DUPLEX_FULL :
                                                 DUPLEX_HALF));
                                        if (retval)
                                                return retval;
                                }
                                if (netif_running(adapter->netdev))
                                        e1000_reinit_locked(adapter);
                                else
                                        e1000_reset(adapter);
                                break;
                        case M88E1000_PHY_SPEC_CTRL:
                        case M88E1000_EXT_PHY_SPEC_CTRL:
                                if (e1000_phy_reset(hw))
                                        return -EIO;
                                break;
                        }
                } else {
                        switch (data->reg_num) {
                        case PHY_CTRL:
                                if (mii_reg & MII_CR_POWER_DOWN)
                                        break;
                                if (netif_running(adapter->netdev))
                                        e1000_reinit_locked(adapter);
                                else
                                        e1000_reset(adapter);
                                break;
                        }
                }
                break;
        default:
                return -EOPNOTSUPP;
        }
        return E1000_SUCCESS;
}

void e1000_pci_set_mwi(struct e1000_hw *hw)
{
        struct e1000_adapter *adapter = hw->back;
        int ret_val = pci_set_mwi(adapter->pdev);

        if (ret_val)
                e_err(probe, "Error in setting MWI\n");
}

void e1000_pci_clear_mwi(struct e1000_hw *hw)
{
        struct e1000_adapter *adapter = hw->back;

        pci_clear_mwi(adapter->pdev);
}

int e1000_pcix_get_mmrbc(struct e1000_hw *hw)
{
        struct e1000_adapter *adapter = hw->back;
        return pcix_get_mmrbc(adapter->pdev);
}

void e1000_pcix_set_mmrbc(struct e1000_hw *hw, int mmrbc)
{
        struct e1000_adapter *adapter = hw->back;
        pcix_set_mmrbc(adapter->pdev, mmrbc);
}

void e1000_io_write(struct e1000_hw *hw, unsigned long port, u32 value)
{
        outl(value, port);
}

static bool e1000_vlan_used(struct e1000_adapter *adapter)
{
        u16 vid;

        for_each_set_bit(vid, adapter->active_vlans, VLAN_N_VID)
                return true;
        return false;
}

static void __e1000_vlan_mode(struct e1000_adapter *adapter,
                              netdev_features_t features)
{
        struct e1000_hw *hw = &adapter->hw;
        u32 ctrl;

        ctrl = er32(CTRL);
        if (features & NETIF_F_HW_VLAN_CTAG_RX) {
                /* enable VLAN tag insert/strip */
                ctrl |= E1000_CTRL_VME;
        } else {
                /* disable VLAN tag insert/strip */
                ctrl &= ~E1000_CTRL_VME;
        }
        ew32(CTRL, ctrl);
}
static void e1000_vlan_filter_on_off(struct e1000_adapter *adapter,
                                     bool filter_on)
{
        struct e1000_hw *hw = &adapter->hw;
        u32 rctl;

        if (!test_bit(__E1000_DOWN, &adapter->flags))
                e1000_irq_disable(adapter);

        __e1000_vlan_mode(adapter, adapter->netdev->features);
        if (filter_on) {
                /* enable VLAN receive filtering */
                rctl = er32(RCTL);
                rctl &= ~E1000_RCTL_CFIEN;
                if (!(adapter->netdev->flags & IFF_PROMISC))
                        rctl |= E1000_RCTL_VFE;
                ew32(RCTL, rctl);
                e1000_update_mng_vlan(adapter);
        } else {
                /* disable VLAN receive filtering */
                rctl = er32(RCTL);
                rctl &= ~E1000_RCTL_VFE;
                ew32(RCTL, rctl);
        }

        if (!test_bit(__E1000_DOWN, &adapter->flags))
                e1000_irq_enable(adapter);
}

static void e1000_vlan_mode(struct net_device *netdev,
                            netdev_features_t features)
{
        struct e1000_adapter *adapter = netdev_priv(netdev);

        if (!test_bit(__E1000_DOWN, &adapter->flags))
                e1000_irq_disable(adapter);

        __e1000_vlan_mode(adapter, features);

        if (!test_bit(__E1000_DOWN, &adapter->flags))
                e1000_irq_enable(adapter);
}

static int e1000_vlan_rx_add_vid(struct net_device *netdev,
                                 __be16 proto, u16 vid)
{
        struct e1000_adapter *adapter = netdev_priv(netdev);
        struct e1000_hw *hw = &adapter->hw;
        u32 vfta, index;

        if ((hw->mng_cookie.status &
             E1000_MNG_DHCP_COOKIE_STATUS_VLAN_SUPPORT) &&
            (vid == adapter->mng_vlan_id))
                return 0;

        if (!e1000_vlan_used(adapter))
                e1000_vlan_filter_on_off(adapter, true);

        /* add VID to filter table */
        index = (vid >> 5) & 0x7F;
        vfta = E1000_READ_REG_ARRAY(hw, VFTA, index);
        vfta |= (1 << (vid & 0x1F));
        e1000_write_vfta(hw, index, vfta);

        set_bit(vid, adapter->active_vlans);

        return 0;
}

static int e1000_vlan_rx_kill_vid(struct net_device *netdev,
                                  __be16 proto, u16 vid)
{
        struct e1000_adapter *adapter = netdev_priv(netdev);
        struct e1000_hw *hw = &adapter->hw;
        u32 vfta, index;

        if (!test_bit(__E1000_DOWN, &adapter->flags))
                e1000_irq_disable(adapter);
        if (!test_bit(__E1000_DOWN, &adapter->flags))
                e1000_irq_enable(adapter);

        /* remove VID from filter table */
        index = (vid >> 5) & 0x7F;
        vfta = E1000_READ_REG_ARRAY(hw, VFTA, index);
        vfta &= ~(1 << (vid & 0x1F));
        e1000_write_vfta(hw, index, vfta);

        clear_bit(vid, adapter->active_vlans);

        if (!e1000_vlan_used(adapter))
                e1000_vlan_filter_on_off(adapter, false);

        return 0;
}

static void e1000_restore_vlan(struct e1000_adapter *adapter)
{
        u16 vid;

        if (!e1000_vlan_used(adapter))
                return;

        e1000_vlan_filter_on_off(adapter, true);
        for_each_set_bit(vid, adapter->active_vlans, VLAN_N_VID)
                e1000_vlan_rx_add_vid(adapter->netdev, htons(ETH_P_8021Q), vid);
}

int e1000_set_spd_dplx(struct e1000_adapter *adapter, u32 spd, u8 dplx)
{
        struct e1000_hw *hw = &adapter->hw;

        hw->autoneg = 0;

        /* Make sure dplx is at most 1 bit and lsb of speed is not set
         * for the switch() below to work
         */
        if ((spd & 1) || (dplx & ~1))
                goto err_inval;

        /* Fiber NICs only allow 1000 gbps Full duplex */
        if ((hw->media_type == e1000_media_type_fiber) &&
            spd != SPEED_1000 &&
            dplx != DUPLEX_FULL)
                goto err_inval;

        switch (spd + dplx) {
        case SPEED_10 + DUPLEX_HALF:
                hw->forced_speed_duplex = e1000_10_half;
                break;
        case SPEED_10 + DUPLEX_FULL:
                hw->forced_speed_duplex = e1000_10_full;
                break;
        case SPEED_100 + DUPLEX_HALF:
                hw->forced_speed_duplex = e1000_100_half;
                break;
        case SPEED_100 + DUPLEX_FULL:
                hw->forced_speed_duplex = e1000_100_full;
                break;
        case SPEED_1000 + DUPLEX_FULL:
                hw->autoneg = 1;
                hw->autoneg_advertised = ADVERTISE_1000_FULL;
                break;
        case SPEED_1000 + DUPLEX_HALF: /* not supported */
        default:
                goto err_inval;
        }

        /* clear MDI, MDI(-X) override is only allowed when autoneg enabled */
        hw->mdix = AUTO_ALL_MODES;

        return 0;

err_inval:
        e_err(probe, "Unsupported Speed/Duplex configuration\n");
        return -EINVAL;
}

static int __e1000_shutdown(struct pci_dev *pdev, bool *enable_wake)
{
        struct net_device *netdev = pci_get_drvdata(pdev);
        struct e1000_adapter *adapter = netdev_priv(netdev);
        struct e1000_hw *hw = &adapter->hw;
        u32 ctrl, ctrl_ext, rctl, status;
        u32 wufc = adapter->wol;

        netif_device_detach(netdev);

        if (netif_running(netdev)) {
                int count = E1000_CHECK_RESET_COUNT;

                while (test_bit(__E1000_RESETTING, &adapter->flags) && count--)
                        usleep_range(10000, 20000);

                WARN_ON(test_bit(__E1000_RESETTING, &adapter->flags));
                rtnl_lock();
                e1000_down(adapter);
                rtnl_unlock();
        }

        status = er32(STATUS);
        if (status & E1000_STATUS_LU)
                wufc &= ~E1000_WUFC_LNKC;

        if (wufc) {
                e1000_setup_rctl(adapter);
                e1000_set_rx_mode(netdev);

                rctl = er32(RCTL);

                /* turn on all-multi mode if wake on multicast is enabled */
                if (wufc & E1000_WUFC_MC)
                        rctl |= E1000_RCTL_MPE;

                /* enable receives in the hardware */
                ew32(RCTL, rctl | E1000_RCTL_EN);

                if (hw->mac_type >= e1000_82540) {
                        ctrl = er32(CTRL);
                        /* advertise wake from D3Cold */
                        #define E1000_CTRL_ADVD3WUC 0x00100000
                        /* phy power management enable */
                        #define E1000_CTRL_EN_PHY_PWR_MGMT 0x00200000
                        ctrl |= E1000_CTRL_ADVD3WUC |
                                E1000_CTRL_EN_PHY_PWR_MGMT;
                        ew32(CTRL, ctrl);
                }

                if (hw->media_type == e1000_media_type_fiber ||
                    hw->media_type == e1000_media_type_internal_serdes) {
                        /* keep the laser running in D3 */
                        ctrl_ext = er32(CTRL_EXT);
                        ctrl_ext |= E1000_CTRL_EXT_SDP7_DATA;
                        ew32(CTRL_EXT, ctrl_ext);
                }

                ew32(WUC, E1000_WUC_PME_EN);
                ew32(WUFC, wufc);
        } else {
                ew32(WUC, 0);
                ew32(WUFC, 0);
        }

        e1000_release_manageability(adapter);

        *enable_wake = !!wufc;

        /* make sure adapter isn't asleep if manageability is enabled */
        if (adapter->en_mng_pt)
                *enable_wake = true;

        if (netif_running(netdev))
                e1000_free_irq(adapter);

        if (!test_and_set_bit(__E1000_DISABLED, &adapter->flags))
                pci_disable_device(pdev);

        return 0;
}

static int e1000_suspend(struct device *dev)
{
        int retval;
        struct pci_dev *pdev = to_pci_dev(dev);
        bool wake;

        retval = __e1000_shutdown(pdev, &wake);
        device_set_wakeup_enable(dev, wake);

        return retval;
}

static int e1000_resume(struct device *dev)
{
        struct pci_dev *pdev = to_pci_dev(dev);
        struct net_device *netdev = pci_get_drvdata(pdev);
        struct e1000_adapter *adapter = netdev_priv(netdev);
        struct e1000_hw *hw = &adapter->hw;
        u32 err;

        if (adapter->need_ioport)
                err = pci_enable_device(pdev);
        else
                err = pci_enable_device_mem(pdev);
        if (err) {
                pr_err("Cannot enable PCI device from suspend\n");
                return err;
        }

        /* flush memory to make sure state is correct */
        smp_mb__before_atomic();
        clear_bit(__E1000_DISABLED, &adapter->flags);
        pci_set_master(pdev);

        pci_enable_wake(pdev, PCI_D3hot, 0);
        pci_enable_wake(pdev, PCI_D3cold, 0);

        if (netif_running(netdev)) {
                err = e1000_request_irq(adapter);
                if (err)
                        return err;
        }

        e1000_power_up_phy(adapter);
        e1000_reset(adapter);
        ew32(WUS, ~0);

        e1000_init_manageability(adapter);

        if (netif_running(netdev))
                e1000_up(adapter);

        netif_device_attach(netdev);

        return 0;
}

static void e1000_shutdown(struct pci_dev *pdev)
{
        bool wake;

        __e1000_shutdown(pdev, &wake);

        if (system_state == SYSTEM_POWER_OFF) {
                pci_wake_from_d3(pdev, wake);
                pci_set_power_state(pdev, PCI_D3hot);
        }
}

#ifdef CONFIG_NET_POLL_CONTROLLER
/* Polling 'interrupt' - used by things like netconsole to send skbs
 * without having to re-enable interrupts. It's not called while
 * the interrupt routine is executing.
 */
static void e1000_netpoll(struct net_device *netdev)
{
        struct e1000_adapter *adapter = netdev_priv(netdev);

        if (disable_hardirq(adapter->pdev->irq))
                e1000_intr(adapter->pdev->irq, netdev);
        enable_irq(adapter->pdev->irq);
}
#endif

/**
 * e1000_io_error_detected - called when PCI error is detected
 * @pdev: Pointer to PCI device
 * @state: The current pci connection state
 *
 * This function is called after a PCI bus error affecting
 * this device has been detected.
 */
static pci_ers_result_t e1000_io_error_detected(struct pci_dev *pdev,
                                                pci_channel_state_t state)
{
        struct net_device *netdev = pci_get_drvdata(pdev);
        struct e1000_adapter *adapter = netdev_priv(netdev);

        rtnl_lock();
        netif_device_detach(netdev);

        if (state == pci_channel_io_perm_failure) {
                rtnl_unlock();
                return PCI_ERS_RESULT_DISCONNECT;
        }

        if (netif_running(netdev))
                e1000_down(adapter);

        if (!test_and_set_bit(__E1000_DISABLED, &adapter->flags))
                pci_disable_device(pdev);
        rtnl_unlock();

        /* Request a slot reset. */
        return PCI_ERS_RESULT_NEED_RESET;
}

/**
 * e1000_io_slot_reset - called after the pci bus has been reset.
 * @pdev: Pointer to PCI device
 *
 * Restart the card from scratch, as if from a cold-boot. Implementation
 * resembles the first-half of the e1000_resume routine.
 */
static pci_ers_result_t e1000_io_slot_reset(struct pci_dev *pdev)
{
        struct net_device *netdev = pci_get_drvdata(pdev);
        struct e1000_adapter *adapter = netdev_priv(netdev);
        struct e1000_hw *hw = &adapter->hw;
        int err;

        if (adapter->need_ioport)
                err = pci_enable_device(pdev);
        else
                err = pci_enable_device_mem(pdev);
        if (err) {
                pr_err("Cannot re-enable PCI device after reset.\n");
                return PCI_ERS_RESULT_DISCONNECT;
        }

        /* flush memory to make sure state is correct */
        smp_mb__before_atomic();
        clear_bit(__E1000_DISABLED, &adapter->flags);
        pci_set_master(pdev);

        pci_enable_wake(pdev, PCI_D3hot, 0);
        pci_enable_wake(pdev, PCI_D3cold, 0);

        e1000_reset(adapter);
        ew32(WUS, ~0);

        return PCI_ERS_RESULT_RECOVERED;
}

/**
 * e1000_io_resume - called when traffic can start flowing again.
 * @pdev: Pointer to PCI device
 *
 * This callback is called when the error recovery driver tells us that
 * its OK to resume normal operation. Implementation resembles the
 * second-half of the e1000_resume routine.
 */
static void e1000_io_resume(struct pci_dev *pdev)
{
        struct net_device *netdev = pci_get_drvdata(pdev);
        struct e1000_adapter *adapter = netdev_priv(netdev);

        e1000_init_manageability(adapter);

        if (netif_running(netdev)) {
                if (e1000_up(adapter)) {
                        pr_info("can't bring device back up after reset\n");
                        return;
                }
        }

        netif_device_attach(netdev);
}

/* e1000_main.c */