// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * Copyright(c) 2007 Atheros Corporation. All rights reserved.
 *
 * Derived from Intel e1000 driver
 * Copyright(c) 1999 - 2005 Intel Corporation. All rights reserved.
 */

#include "atl1e.h"

char atl1e_driver_name[] = "ATL1E";
#define PCI_DEVICE_ID_ATTANSIC_L1E      0x1026
/*
 * atl1e_pci_tbl - PCI Device ID Table
 *
 * Wildcard entries (PCI_ANY_ID) should come last
 * Last entry must be all 0s
 *
 * { Vendor ID, Device ID, SubVendor ID, SubDevice ID,
 *   Class, Class Mask, private data (not used) }
 */
static const struct pci_device_id atl1e_pci_tbl[] = {
        {PCI_DEVICE(PCI_VENDOR_ID_ATTANSIC, PCI_DEVICE_ID_ATTANSIC_L1E)},
        {PCI_DEVICE(PCI_VENDOR_ID_ATTANSIC, 0x1066)},
        /* required last entry */
        { 0 }
};
MODULE_DEVICE_TABLE(pci, atl1e_pci_tbl);

MODULE_AUTHOR("Atheros Corporation, <xiong.huang@atheros.com>, Jie Yang <jie.yang@atheros.com>");
MODULE_DESCRIPTION("Atheros 1000M Ethernet Network Driver");
MODULE_LICENSE("GPL");

static void atl1e_setup_mac_ctrl(struct atl1e_adapter *adapter);

static const u16
atl1e_rx_page_vld_regs[AT_MAX_RECEIVE_QUEUE][AT_PAGE_NUM_PER_QUEUE] =
{
        {REG_HOST_RXF0_PAGE0_VLD, REG_HOST_RXF0_PAGE1_VLD},
        {REG_HOST_RXF1_PAGE0_VLD, REG_HOST_RXF1_PAGE1_VLD},
        {REG_HOST_RXF2_PAGE0_VLD, REG_HOST_RXF2_PAGE1_VLD},
        {REG_HOST_RXF3_PAGE0_VLD, REG_HOST_RXF3_PAGE1_VLD}
};

static const u16 atl1e_rx_page_hi_addr_regs[AT_MAX_RECEIVE_QUEUE] =
{
        REG_RXF0_BASE_ADDR_HI,
        REG_RXF1_BASE_ADDR_HI,
        REG_RXF2_BASE_ADDR_HI,
        REG_RXF3_BASE_ADDR_HI
};

static const u16
atl1e_rx_page_lo_addr_regs[AT_MAX_RECEIVE_QUEUE][AT_PAGE_NUM_PER_QUEUE] =
{
        {REG_HOST_RXF0_PAGE0_LO, REG_HOST_RXF0_PAGE1_LO},
        {REG_HOST_RXF1_PAGE0_LO, REG_HOST_RXF1_PAGE1_LO},
        {REG_HOST_RXF2_PAGE0_LO, REG_HOST_RXF2_PAGE1_LO},
        {REG_HOST_RXF3_PAGE0_LO, REG_HOST_RXF3_PAGE1_LO}
};

static const u16
atl1e_rx_page_write_offset_regs[AT_MAX_RECEIVE_QUEUE][AT_PAGE_NUM_PER_QUEUE] =
{
        {REG_HOST_RXF0_MB0_LO,  REG_HOST_RXF0_MB1_LO},
        {REG_HOST_RXF1_MB0_LO,  REG_HOST_RXF1_MB1_LO},
        {REG_HOST_RXF2_MB0_LO,  REG_HOST_RXF2_MB1_LO},
        {REG_HOST_RXF3_MB0_LO,  REG_HOST_RXF3_MB1_LO}
};

static const u16 atl1e_pay_load_size[] = {
        128, 256, 512, 1024, 2048, 4096,
};

/**
 * atl1e_irq_enable - Enable default interrupt generation settings
 * @adapter: board private structure
 */
static inline void atl1e_irq_enable(struct atl1e_adapter *adapter)
{
        if (likely(atomic_dec_and_test(&adapter->irq_sem))) {
                AT_WRITE_REG(&adapter->hw, REG_ISR, 0);
                AT_WRITE_REG(&adapter->hw, REG_IMR, IMR_NORMAL_MASK);
                AT_WRITE_FLUSH(&adapter->hw);
        }
}

/**
 * atl1e_irq_disable - Mask off interrupt generation on the NIC
 * @adapter: board private structure
 */
static inline void atl1e_irq_disable(struct atl1e_adapter *adapter)
{
        atomic_inc(&adapter->irq_sem);
        AT_WRITE_REG(&adapter->hw, REG_IMR, 0);
        AT_WRITE_FLUSH(&adapter->hw);
        synchronize_irq(adapter->pdev->irq);
}

/**
 * atl1e_irq_reset - reset interrupt confiure on the NIC
 * @adapter: board private structure
 */
static inline void atl1e_irq_reset(struct atl1e_adapter *adapter)
{
        atomic_set(&adapter->irq_sem, 0);
        AT_WRITE_REG(&adapter->hw, REG_ISR, 0);
        AT_WRITE_REG(&adapter->hw, REG_IMR, 0);
        AT_WRITE_FLUSH(&adapter->hw);
}

/**
 * atl1e_phy_config - Timer Call-back
 * @t: timer list containing pointer to netdev cast into an unsigned long
 */
static void atl1e_phy_config(struct timer_list *t)
{
        struct atl1e_adapter *adapter = from_timer(adapter, t,
                                                   phy_config_timer);
        struct atl1e_hw *hw = &adapter->hw;
        unsigned long flags;

        spin_lock_irqsave(&adapter->mdio_lock, flags);
        atl1e_restart_autoneg(hw);
        spin_unlock_irqrestore(&adapter->mdio_lock, flags);
}

void atl1e_reinit_locked(struct atl1e_adapter *adapter)
{
        while (test_and_set_bit(__AT_RESETTING, &adapter->flags))
                msleep(1);
        atl1e_down(adapter);
        atl1e_up(adapter);
        clear_bit(__AT_RESETTING, &adapter->flags);
}

static void atl1e_reset_task(struct work_struct *work)
{
        struct atl1e_adapter *adapter;
        adapter = container_of(work, struct atl1e_adapter, reset_task);

        atl1e_reinit_locked(adapter);
}

static int atl1e_check_link(struct atl1e_adapter *adapter)
{
        struct atl1e_hw *hw = &adapter->hw;
        struct net_device *netdev = adapter->netdev;
        int err = 0;
        u16 speed, duplex, phy_data;

        /* MII_BMSR must read twice */
        atl1e_read_phy_reg(hw, MII_BMSR, &phy_data);
        atl1e_read_phy_reg(hw, MII_BMSR, &phy_data);
        if ((phy_data & BMSR_LSTATUS) == 0) {
                /* link down */
                if (netif_carrier_ok(netdev)) { /* old link state: Up */
                        u32 value;
                        /* disable rx */
                        value = AT_READ_REG(hw, REG_MAC_CTRL);
                        value &= ~MAC_CTRL_RX_EN;
                        AT_WRITE_REG(hw, REG_MAC_CTRL, value);
                        adapter->link_speed = SPEED_0;
                        netif_carrier_off(netdev);
                        netif_stop_queue(netdev);
                }
        } else {
                /* Link Up */
                err = atl1e_get_speed_and_duplex(hw, &speed, &duplex);
                if (unlikely(err))
                        return err;

                /* link result is our setting */
                if (adapter->link_speed != speed ||
                    adapter->link_duplex != duplex) {
                        adapter->link_speed  = speed;
                        adapter->link_duplex = duplex;
                        atl1e_setup_mac_ctrl(adapter);
                        netdev_info(netdev,
                                    "NIC Link is Up <%d Mbps %s Duplex>\n",
                                    adapter->link_speed,
                                    adapter->link_duplex == FULL_DUPLEX ?
                                    "Full" : "Half");
                }

                if (!netif_carrier_ok(netdev)) {
                        /* Link down -> Up */
                        netif_carrier_on(netdev);
                        netif_wake_queue(netdev);
                }
        }
        return 0;
}

/**
 * atl1e_link_chg_task - deal with link change event Out of interrupt context
 * @work: work struct with driver info
 */
static void atl1e_link_chg_task(struct work_struct *work)
{
        struct atl1e_adapter *adapter;
        unsigned long flags;

        adapter = container_of(work, struct atl1e_adapter, link_chg_task);
        spin_lock_irqsave(&adapter->mdio_lock, flags);
        atl1e_check_link(adapter);
        spin_unlock_irqrestore(&adapter->mdio_lock, flags);
}

static void atl1e_link_chg_event(struct atl1e_adapter *adapter)
{
        struct net_device *netdev = adapter->netdev;
        u16 phy_data = 0;
        u16 link_up = 0;

        spin_lock(&adapter->mdio_lock);
        atl1e_read_phy_reg(&adapter->hw, MII_BMSR, &phy_data);
        atl1e_read_phy_reg(&adapter->hw, MII_BMSR, &phy_data);
        spin_unlock(&adapter->mdio_lock);
        link_up = phy_data & BMSR_LSTATUS;
        /* notify upper layer link down ASAP */
        if (!link_up) {
                if (netif_carrier_ok(netdev)) {
                        /* old link state: Up */
                        netdev_info(netdev, "NIC Link is Down\n");
                        adapter->link_speed = SPEED_0;
                        netif_stop_queue(netdev);
                }
        }
        schedule_work(&adapter->link_chg_task);
}

static void atl1e_del_timer(struct atl1e_adapter *adapter)
{
        del_timer_sync(&adapter->phy_config_timer);
}

static void atl1e_cancel_work(struct atl1e_adapter *adapter)
{
        cancel_work_sync(&adapter->reset_task);
        cancel_work_sync(&adapter->link_chg_task);
}

/**
 * atl1e_tx_timeout - Respond to a Tx Hang
 * @netdev: network interface device structure
 * @txqueue: the index of the hanging queue
 */
static void atl1e_tx_timeout(struct net_device *netdev, unsigned int txqueue)
{
        struct atl1e_adapter *adapter = netdev_priv(netdev);

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

/**
 * atl1e_set_multi - Multicast and Promiscuous mode set
 * @netdev: network interface device structure
 *
 * The set_multi entry point is called whenever the multicast address
 * list or the network interface flags are updated.  This routine is
 * responsible for configuring the hardware for proper multicast,
 * promiscuous mode, and all-multi behavior.
 */
static void atl1e_set_multi(struct net_device *netdev)
{
        struct atl1e_adapter *adapter = netdev_priv(netdev);
        struct atl1e_hw *hw = &adapter->hw;
        struct netdev_hw_addr *ha;
        u32 mac_ctrl_data = 0;
        u32 hash_value;

        /* Check for Promiscuous and All Multicast modes */
        mac_ctrl_data = AT_READ_REG(hw, REG_MAC_CTRL);

        if (netdev->flags & IFF_PROMISC) {
                mac_ctrl_data |= MAC_CTRL_PROMIS_EN;
        } else if (netdev->flags & IFF_ALLMULTI) {
                mac_ctrl_data |= MAC_CTRL_MC_ALL_EN;
                mac_ctrl_data &= ~MAC_CTRL_PROMIS_EN;
        } else {
                mac_ctrl_data &= ~(MAC_CTRL_PROMIS_EN | MAC_CTRL_MC_ALL_EN);
        }

        AT_WRITE_REG(hw, REG_MAC_CTRL, mac_ctrl_data);

        /* clear the old settings from the multicast hash table */
        AT_WRITE_REG(hw, REG_RX_HASH_TABLE, 0);
        AT_WRITE_REG_ARRAY(hw, REG_RX_HASH_TABLE, 1, 0);

        /* comoute mc addresses' hash value ,and put it into hash table */
        netdev_for_each_mc_addr(ha, netdev) {
                hash_value = atl1e_hash_mc_addr(hw, ha->addr);
                atl1e_hash_set(hw, hash_value);
        }
}

static void __atl1e_rx_mode(netdev_features_t features, u32 *mac_ctrl_data)
{

        if (features & NETIF_F_RXALL) {
                /* enable RX of ALL frames */
                *mac_ctrl_data |= MAC_CTRL_DBG;
        } else {
                /* disable RX of ALL frames */
                *mac_ctrl_data &= ~MAC_CTRL_DBG;
        }
}

static void atl1e_rx_mode(struct net_device *netdev,
        netdev_features_t features)
{
        struct atl1e_adapter *adapter = netdev_priv(netdev);
        u32 mac_ctrl_data = 0;

        netdev_dbg(adapter->netdev, "%s\n", __func__);

        atl1e_irq_disable(adapter);
        mac_ctrl_data = AT_READ_REG(&adapter->hw, REG_MAC_CTRL);
        __atl1e_rx_mode(features, &mac_ctrl_data);
        AT_WRITE_REG(&adapter->hw, REG_MAC_CTRL, mac_ctrl_data);
        atl1e_irq_enable(adapter);
}


static void __atl1e_vlan_mode(netdev_features_t features, u32 *mac_ctrl_data)
{
        if (features & NETIF_F_HW_VLAN_CTAG_RX) {
                /* enable VLAN tag insert/strip */
                *mac_ctrl_data |= MAC_CTRL_RMV_VLAN;
        } else {
                /* disable VLAN tag insert/strip */
                *mac_ctrl_data &= ~MAC_CTRL_RMV_VLAN;
        }
}

static void atl1e_vlan_mode(struct net_device *netdev,
        netdev_features_t features)
{
        struct atl1e_adapter *adapter = netdev_priv(netdev);
        u32 mac_ctrl_data = 0;

        netdev_dbg(adapter->netdev, "%s\n", __func__);

        atl1e_irq_disable(adapter);
        mac_ctrl_data = AT_READ_REG(&adapter->hw, REG_MAC_CTRL);
        __atl1e_vlan_mode(features, &mac_ctrl_data);
        AT_WRITE_REG(&adapter->hw, REG_MAC_CTRL, mac_ctrl_data);
        atl1e_irq_enable(adapter);
}

static void atl1e_restore_vlan(struct atl1e_adapter *adapter)
{
        netdev_dbg(adapter->netdev, "%s\n", __func__);
        atl1e_vlan_mode(adapter->netdev, adapter->netdev->features);
}

/**
 * atl1e_set_mac_addr - 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 atl1e_set_mac_addr(struct net_device *netdev, void *p)
{
        struct atl1e_adapter *adapter = netdev_priv(netdev);
        struct sockaddr *addr = p;

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

        if (netif_running(netdev))
                return -EBUSY;

        memcpy(netdev->dev_addr, addr->sa_data, netdev->addr_len);
        memcpy(adapter->hw.mac_addr, addr->sa_data, netdev->addr_len);

        atl1e_hw_set_mac_addr(&adapter->hw);

        return 0;
}

static netdev_features_t atl1e_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 atl1e_set_features(struct net_device *netdev,
        netdev_features_t features)
{
        netdev_features_t changed = netdev->features ^ features;

        if (changed & NETIF_F_HW_VLAN_CTAG_RX)
                atl1e_vlan_mode(netdev, features);

        if (changed & NETIF_F_RXALL)
                atl1e_rx_mode(netdev, features);


        return 0;
}

/**
 * atl1e_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 atl1e_change_mtu(struct net_device *netdev, int new_mtu)
{
        struct atl1e_adapter *adapter = netdev_priv(netdev);
        int max_frame = new_mtu + ETH_HLEN + ETH_FCS_LEN + VLAN_HLEN;

        /* set MTU */
        if (netif_running(netdev)) {
                while (test_and_set_bit(__AT_RESETTING, &adapter->flags))
                        msleep(1);
                netdev->mtu = new_mtu;
                adapter->hw.max_frame_size = new_mtu;
                adapter->hw.rx_jumbo_th = (max_frame + 7) >> 3;
                atl1e_down(adapter);
                atl1e_up(adapter);
                clear_bit(__AT_RESETTING, &adapter->flags);
        }
        return 0;
}

/*
 *  caller should hold mdio_lock
 */
static int atl1e_mdio_read(struct net_device *netdev, int phy_id, int reg_num)
{
        struct atl1e_adapter *adapter = netdev_priv(netdev);
        u16 result;

        atl1e_read_phy_reg(&adapter->hw, reg_num & MDIO_REG_ADDR_MASK, &result);
        return result;
}

static void atl1e_mdio_write(struct net_device *netdev, int phy_id,
                             int reg_num, int val)
{
        struct atl1e_adapter *adapter = netdev_priv(netdev);

        if (atl1e_write_phy_reg(&adapter->hw,
                                reg_num & MDIO_REG_ADDR_MASK, val))
                netdev_err(netdev, "write phy register failed\n");
}

static int atl1e_mii_ioctl(struct net_device *netdev,
                           struct ifreq *ifr, int cmd)
{
        struct atl1e_adapter *adapter = netdev_priv(netdev);
        struct mii_ioctl_data *data = if_mii(ifr);
        unsigned long flags;
        int retval = 0;

        if (!netif_running(netdev))
                return -EINVAL;

        spin_lock_irqsave(&adapter->mdio_lock, flags);
        switch (cmd) {
        case SIOCGMIIPHY:
                data->phy_id = 0;
                break;

        case SIOCGMIIREG:
                if (atl1e_read_phy_reg(&adapter->hw, data->reg_num & 0x1F,
                                    &data->val_out)) {
                        retval = -EIO;
                        goto out;
                }
                break;

        case SIOCSMIIREG:
                if (data->reg_num & ~(0x1F)) {
                        retval = -EFAULT;
                        goto out;
                }

                netdev_dbg(adapter->netdev, "<atl1e_mii_ioctl> write %x %x\n",
                           data->reg_num, data->val_in);
                if (atl1e_write_phy_reg(&adapter->hw,
                                     data->reg_num, data->val_in)) {
                        retval = -EIO;
                        goto out;
                }
                break;

        default:
                retval = -EOPNOTSUPP;
                break;
        }
out:
        spin_unlock_irqrestore(&adapter->mdio_lock, flags);
        return retval;

}

static int atl1e_ioctl(struct net_device *netdev, struct ifreq *ifr, int cmd)
{
        switch (cmd) {
        case SIOCGMIIPHY:
        case SIOCGMIIREG:
        case SIOCSMIIREG:
                return atl1e_mii_ioctl(netdev, ifr, cmd);
        default:
                return -EOPNOTSUPP;
        }
}

static void atl1e_setup_pcicmd(struct pci_dev *pdev)
{
        u16 cmd;

        pci_read_config_word(pdev, PCI_COMMAND, &cmd);
        cmd &= ~(PCI_COMMAND_INTX_DISABLE | PCI_COMMAND_IO);
        cmd |=  (PCI_COMMAND_MEMORY | PCI_COMMAND_MASTER);
        pci_write_config_word(pdev, PCI_COMMAND, cmd);

        /*
         * some motherboards BIOS(PXE/EFI) driver may set PME
         * while they transfer control to OS (Windows/Linux)
         * so we should clear this bit before NIC work normally
         */
        pci_write_config_dword(pdev, REG_PM_CTRLSTAT, 0);
        msleep(1);
}

/**
 * atl1e_alloc_queues - Allocate memory for all rings
 * @adapter: board private structure to initialize
 *
 */
static int atl1e_alloc_queues(struct atl1e_adapter *adapter)
{
        return 0;
}

/**
 * atl1e_sw_init - Initialize general software structures (struct atl1e_adapter)
 * @adapter: board private structure to initialize
 *
 * atl1e_sw_init initializes the Adapter private data structure.
 * Fields are initialized based on PCI device information and
 * OS network device settings (MTU size).
 */
static int atl1e_sw_init(struct atl1e_adapter *adapter)
{
        struct atl1e_hw *hw   = &adapter->hw;
        struct pci_dev  *pdev = adapter->pdev;
        u32 phy_status_data = 0;

        adapter->wol = 0;
        adapter->link_speed = SPEED_0;   /* hardware init */
        adapter->link_duplex = FULL_DUPLEX;
        adapter->num_rx_queues = 1;

        /* 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);

        phy_status_data = AT_READ_REG(hw, REG_PHY_STATUS);
        /* nic type */
        if (hw->revision_id >= 0xF0) {
                hw->nic_type = athr_l2e_revB;
        } else {
                if (phy_status_data & PHY_STATUS_100M)
                        hw->nic_type = athr_l1e;
                else
                        hw->nic_type = athr_l2e_revA;
        }

        phy_status_data = AT_READ_REG(hw, REG_PHY_STATUS);

        if (phy_status_data & PHY_STATUS_EMI_CA)
                hw->emi_ca = true;
        else
                hw->emi_ca = false;

        hw->phy_configured = false;
        hw->preamble_len = 7;
        hw->max_frame_size = adapter->netdev->mtu;
        hw->rx_jumbo_th = (hw->max_frame_size + ETH_HLEN +
                                VLAN_HLEN + ETH_FCS_LEN + 7) >> 3;

        hw->rrs_type = atl1e_rrs_disable;
        hw->indirect_tab = 0;
        hw->base_cpu = 0;

        /* need confirm */

        hw->ict = 50000;                 /* 100ms */
        hw->smb_timer = 200000;          /* 200ms  */
        hw->tpd_burst = 5;
        hw->rrd_thresh = 1;
        hw->tpd_thresh = adapter->tx_ring.count / 2;
        hw->rx_count_down = 4;  /* 2us resolution */
        hw->tx_count_down = hw->imt * 4 / 3;
        hw->dmar_block = atl1e_dma_req_1024;
        hw->dmaw_block = atl1e_dma_req_1024;
        hw->dmar_dly_cnt = 15;
        hw->dmaw_dly_cnt = 4;

        if (atl1e_alloc_queues(adapter)) {
                netdev_err(adapter->netdev, "Unable to allocate memory for queues\n");
                return -ENOMEM;
        }

        atomic_set(&adapter->irq_sem, 1);
        spin_lock_init(&adapter->mdio_lock);

        set_bit(__AT_DOWN, &adapter->flags);

        return 0;
}

/**
 * atl1e_clean_tx_ring - Free Tx-skb
 * @adapter: board private structure
 */
static void atl1e_clean_tx_ring(struct atl1e_adapter *adapter)
{
        struct atl1e_tx_ring *tx_ring = &adapter->tx_ring;
        struct atl1e_tx_buffer *tx_buffer = NULL;
        struct pci_dev *pdev = adapter->pdev;
        u16 index, ring_count;

        if (tx_ring->desc == NULL || tx_ring->tx_buffer == NULL)
                return;

        ring_count = tx_ring->count;
        /* first unmmap dma */
        for (index = 0; index < ring_count; index++) {
                tx_buffer = &tx_ring->tx_buffer[index];
                if (tx_buffer->dma) {
                        if (tx_buffer->flags & ATL1E_TX_PCIMAP_SINGLE)
                                dma_unmap_single(&pdev->dev, tx_buffer->dma,
                                                 tx_buffer->length,
                                                 DMA_TO_DEVICE);
                        else if (tx_buffer->flags & ATL1E_TX_PCIMAP_PAGE)
                                dma_unmap_page(&pdev->dev, tx_buffer->dma,
                                               tx_buffer->length,
                                               DMA_TO_DEVICE);
                        tx_buffer->dma = 0;
                }
        }
        /* second free skb */
        for (index = 0; index < ring_count; index++) {
                tx_buffer = &tx_ring->tx_buffer[index];
                if (tx_buffer->skb) {
                        dev_kfree_skb_any(tx_buffer->skb);
                        tx_buffer->skb = NULL;
                }
        }
        /* Zero out Tx-buffers */
        memset(tx_ring->desc, 0, sizeof(struct atl1e_tpd_desc) *
                                ring_count);
        memset(tx_ring->tx_buffer, 0, sizeof(struct atl1e_tx_buffer) *
                                ring_count);
}

/**
 * atl1e_clean_rx_ring - Free rx-reservation skbs
 * @adapter: board private structure
 */
static void atl1e_clean_rx_ring(struct atl1e_adapter *adapter)
{
        struct atl1e_rx_ring *rx_ring =
                &adapter->rx_ring;
        struct atl1e_rx_page_desc *rx_page_desc = rx_ring->rx_page_desc;
        u16 i, j;


        if (adapter->ring_vir_addr == NULL)
                return;
        /* Zero out the descriptor ring */
        for (i = 0; i < adapter->num_rx_queues; i++) {
                for (j = 0; j < AT_PAGE_NUM_PER_QUEUE; j++) {
                        if (rx_page_desc[i].rx_page[j].addr != NULL) {
                                memset(rx_page_desc[i].rx_page[j].addr, 0,
                                                rx_ring->real_page_size);
                        }
                }
        }
}

static void atl1e_cal_ring_size(struct atl1e_adapter *adapter, u32 *ring_size)
{
        *ring_size = ((u32)(adapter->tx_ring.count *
                     sizeof(struct atl1e_tpd_desc) + 7
                        /* tx ring, qword align */
                     + adapter->rx_ring.real_page_size * AT_PAGE_NUM_PER_QUEUE *
                        adapter->num_rx_queues + 31
                        /* rx ring,  32 bytes align */
                     + (1 + AT_PAGE_NUM_PER_QUEUE * adapter->num_rx_queues) *
                        sizeof(u32) + 3));
                        /* tx, rx cmd, dword align   */
}

static void atl1e_init_ring_resources(struct atl1e_adapter *adapter)
{
        struct atl1e_rx_ring *rx_ring = NULL;

        rx_ring = &adapter->rx_ring;

        rx_ring->real_page_size = adapter->rx_ring.page_size
                                 + adapter->hw.max_frame_size
                                 + ETH_HLEN + VLAN_HLEN
                                 + ETH_FCS_LEN;
        rx_ring->real_page_size = roundup(rx_ring->real_page_size, 32);
        atl1e_cal_ring_size(adapter, &adapter->ring_size);

        adapter->ring_vir_addr = NULL;
        adapter->rx_ring.desc = NULL;
        rwlock_init(&adapter->tx_ring.tx_lock);
}

/*
 * Read / Write Ptr Initialize:
 */
static void atl1e_init_ring_ptrs(struct atl1e_adapter *adapter)
{
        struct atl1e_tx_ring *tx_ring = NULL;
        struct atl1e_rx_ring *rx_ring = NULL;
        struct atl1e_rx_page_desc *rx_page_desc = NULL;
        int i, j;

        tx_ring = &adapter->tx_ring;
        rx_ring = &adapter->rx_ring;
        rx_page_desc = rx_ring->rx_page_desc;

        tx_ring->next_to_use = 0;
        atomic_set(&tx_ring->next_to_clean, 0);

        for (i = 0; i < adapter->num_rx_queues; i++) {
                rx_page_desc[i].rx_using  = 0;
                rx_page_desc[i].rx_nxseq = 0;
                for (j = 0; j < AT_PAGE_NUM_PER_QUEUE; j++) {
                        *rx_page_desc[i].rx_page[j].write_offset_addr = 0;
                        rx_page_desc[i].rx_page[j].read_offset = 0;
                }
        }
}

/**
 * atl1e_free_ring_resources - Free Tx / RX descriptor Resources
 * @adapter: board private structure
 *
 * Free all transmit software resources
 */
static void atl1e_free_ring_resources(struct atl1e_adapter *adapter)
{
        struct pci_dev *pdev = adapter->pdev;

        atl1e_clean_tx_ring(adapter);
        atl1e_clean_rx_ring(adapter);

        if (adapter->ring_vir_addr) {
                dma_free_coherent(&pdev->dev, adapter->ring_size,
                                  adapter->ring_vir_addr, adapter->ring_dma);
                adapter->ring_vir_addr = NULL;
        }

        if (adapter->tx_ring.tx_buffer) {
                kfree(adapter->tx_ring.tx_buffer);
                adapter->tx_ring.tx_buffer = NULL;
        }
}

/**
 * atl1e_setup_ring_resources - allocate Tx / RX descriptor resources
 * @adapter: board private structure
 *
 * Return 0 on success, negative on failure
 */
static int atl1e_setup_ring_resources(struct atl1e_adapter *adapter)
{
        struct pci_dev *pdev = adapter->pdev;
        struct atl1e_tx_ring *tx_ring;
        struct atl1e_rx_ring *rx_ring;
        struct atl1e_rx_page_desc  *rx_page_desc;
        int size, i, j;
        u32 offset = 0;
        int err = 0;

        if (adapter->ring_vir_addr != NULL)
                return 0; /* alloced already */

        tx_ring = &adapter->tx_ring;
        rx_ring = &adapter->rx_ring;

        /* real ring DMA buffer */

        size = adapter->ring_size;
        adapter->ring_vir_addr = dma_alloc_coherent(&pdev->dev,
                                                    adapter->ring_size,
                                                    &adapter->ring_dma, GFP_KERNEL);
        if (adapter->ring_vir_addr == NULL) {
                netdev_err(adapter->netdev,
                           "dma_alloc_coherent failed, size = D%d\n", size);
                return -ENOMEM;
        }

        rx_page_desc = rx_ring->rx_page_desc;

        /* Init TPD Ring */
        tx_ring->dma = roundup(adapter->ring_dma, 8);
        offset = tx_ring->dma - adapter->ring_dma;
        tx_ring->desc = adapter->ring_vir_addr + offset;
        size = sizeof(struct atl1e_tx_buffer) * (tx_ring->count);
        tx_ring->tx_buffer = kzalloc(size, GFP_KERNEL);
        if (tx_ring->tx_buffer == NULL) {
                err = -ENOMEM;
                goto failed;
        }

        /* Init RXF-Pages */
        offset += (sizeof(struct atl1e_tpd_desc) * tx_ring->count);
        offset = roundup(offset, 32);

        for (i = 0; i < adapter->num_rx_queues; i++) {
                for (j = 0; j < AT_PAGE_NUM_PER_QUEUE; j++) {
                        rx_page_desc[i].rx_page[j].dma =
                                adapter->ring_dma + offset;
                        rx_page_desc[i].rx_page[j].addr =
                                adapter->ring_vir_addr + offset;
                        offset += rx_ring->real_page_size;
                }
        }

        /* Init CMB dma address */
        tx_ring->cmb_dma = adapter->ring_dma + offset;
        tx_ring->cmb = adapter->ring_vir_addr + offset;
        offset += sizeof(u32);

        for (i = 0; i < adapter->num_rx_queues; i++) {
                for (j = 0; j < AT_PAGE_NUM_PER_QUEUE; j++) {
                        rx_page_desc[i].rx_page[j].write_offset_dma =
                                adapter->ring_dma + offset;
                        rx_page_desc[i].rx_page[j].write_offset_addr =
                                adapter->ring_vir_addr + offset;
                        offset += sizeof(u32);
                }
        }

        if (unlikely(offset > adapter->ring_size)) {
                netdev_err(adapter->netdev, "offset(%d) > ring size(%d) !!\n",
                           offset, adapter->ring_size);
                err = -1;
                goto failed;
        }

        return 0;
failed:
        if (adapter->ring_vir_addr != NULL) {
                dma_free_coherent(&pdev->dev, adapter->ring_size,
                                  adapter->ring_vir_addr, adapter->ring_dma);
                adapter->ring_vir_addr = NULL;
        }
        return err;
}

static inline void atl1e_configure_des_ring(struct atl1e_adapter *adapter)
{

        struct atl1e_hw *hw = &adapter->hw;
        struct atl1e_rx_ring *rx_ring = &adapter->rx_ring;
        struct atl1e_tx_ring *tx_ring = &adapter->tx_ring;
        struct atl1e_rx_page_desc *rx_page_desc = NULL;
        int i, j;

        AT_WRITE_REG(hw, REG_DESC_BASE_ADDR_HI,
                        (u32)((adapter->ring_dma & AT_DMA_HI_ADDR_MASK) >> 32));
        AT_WRITE_REG(hw, REG_TPD_BASE_ADDR_LO,
                        (u32)((tx_ring->dma) & AT_DMA_LO_ADDR_MASK));
        AT_WRITE_REG(hw, REG_TPD_RING_SIZE, (u16)(tx_ring->count));
        AT_WRITE_REG(hw, REG_HOST_TX_CMB_LO,
                        (u32)((tx_ring->cmb_dma) & AT_DMA_LO_ADDR_MASK));

        rx_page_desc = rx_ring->rx_page_desc;
        /* RXF Page Physical address / Page Length */
        for (i = 0; i < AT_MAX_RECEIVE_QUEUE; i++) {
                AT_WRITE_REG(hw, atl1e_rx_page_hi_addr_regs[i],
                                 (u32)((adapter->ring_dma &
                                 AT_DMA_HI_ADDR_MASK) >> 32));
                for (j = 0; j < AT_PAGE_NUM_PER_QUEUE; j++) {
                        u32 page_phy_addr;
                        u32 offset_phy_addr;

                        page_phy_addr = rx_page_desc[i].rx_page[j].dma;
                        offset_phy_addr =
                                   rx_page_desc[i].rx_page[j].write_offset_dma;

                        AT_WRITE_REG(hw, atl1e_rx_page_lo_addr_regs[i][j],
                                        page_phy_addr & AT_DMA_LO_ADDR_MASK);
                        AT_WRITE_REG(hw, atl1e_rx_page_write_offset_regs[i][j],
                                        offset_phy_addr & AT_DMA_LO_ADDR_MASK);
                        AT_WRITE_REGB(hw, atl1e_rx_page_vld_regs[i][j], 1);
                }
        }
        /* Page Length */
        AT_WRITE_REG(hw, REG_HOST_RXFPAGE_SIZE, rx_ring->page_size);
        /* Load all of base address above */
        AT_WRITE_REG(hw, REG_LOAD_PTR, 1);
}

static inline void atl1e_configure_tx(struct atl1e_adapter *adapter)
{
        struct atl1e_hw *hw = &adapter->hw;
        u32 dev_ctrl_data = 0;
        u32 max_pay_load = 0;
        u32 jumbo_thresh = 0;
        u32 extra_size = 0;     /* Jumbo frame threshold in QWORD unit */

        /* configure TXQ param */
        if (hw->nic_type != athr_l2e_revB) {
                extra_size = ETH_HLEN + VLAN_HLEN + ETH_FCS_LEN;
                if (hw->max_frame_size <= 1500) {
                        jumbo_thresh = hw->max_frame_size + extra_size;
                } else if (hw->max_frame_size < 6*1024) {
                        jumbo_thresh =
                                (hw->max_frame_size + extra_size) * 2 / 3;
                } else {
                        jumbo_thresh = (hw->max_frame_size + extra_size) / 2;
                }
                AT_WRITE_REG(hw, REG_TX_EARLY_TH, (jumbo_thresh + 7) >> 3);
        }

        dev_ctrl_data = AT_READ_REG(hw, REG_DEVICE_CTRL);

        max_pay_load  = ((dev_ctrl_data >> DEVICE_CTRL_MAX_PAYLOAD_SHIFT)) &
                        DEVICE_CTRL_MAX_PAYLOAD_MASK;

        hw->dmaw_block = min_t(u32, max_pay_load, hw->dmaw_block);

        max_pay_load  = ((dev_ctrl_data >> DEVICE_CTRL_MAX_RREQ_SZ_SHIFT)) &
                        DEVICE_CTRL_MAX_RREQ_SZ_MASK;
        hw->dmar_block = min_t(u32, max_pay_load, hw->dmar_block);

        if (hw->nic_type != athr_l2e_revB)
                AT_WRITE_REGW(hw, REG_TXQ_CTRL + 2,
                              atl1e_pay_load_size[hw->dmar_block]);
        /* enable TXQ */
        AT_WRITE_REGW(hw, REG_TXQ_CTRL,
                        (((u16)hw->tpd_burst & TXQ_CTRL_NUM_TPD_BURST_MASK)
                         << TXQ_CTRL_NUM_TPD_BURST_SHIFT)
                        | TXQ_CTRL_ENH_MODE | TXQ_CTRL_EN);
}

static inline void atl1e_configure_rx(struct atl1e_adapter *adapter)
{
        struct atl1e_hw *hw = &adapter->hw;
        u32 rxf_len  = 0;
        u32 rxf_low  = 0;
        u32 rxf_high = 0;
        u32 rxf_thresh_data = 0;
        u32 rxq_ctrl_data = 0;

        if (hw->nic_type != athr_l2e_revB) {
                AT_WRITE_REGW(hw, REG_RXQ_JMBOSZ_RRDTIM,
                              (u16)((hw->rx_jumbo_th & RXQ_JMBOSZ_TH_MASK) <<
                              RXQ_JMBOSZ_TH_SHIFT |
                              (1 & RXQ_JMBO_LKAH_MASK) <<
                              RXQ_JMBO_LKAH_SHIFT));

                rxf_len  = AT_READ_REG(hw, REG_SRAM_RXF_LEN);
                rxf_high = rxf_len * 4 / 5;
                rxf_low  = rxf_len / 5;
                rxf_thresh_data = ((rxf_high  & RXQ_RXF_PAUSE_TH_HI_MASK)
                                  << RXQ_RXF_PAUSE_TH_HI_SHIFT) |
                                  ((rxf_low & RXQ_RXF_PAUSE_TH_LO_MASK)
                                  << RXQ_RXF_PAUSE_TH_LO_SHIFT);

                AT_WRITE_REG(hw, REG_RXQ_RXF_PAUSE_THRESH, rxf_thresh_data);
        }

        /* RRS */
        AT_WRITE_REG(hw, REG_IDT_TABLE, hw->indirect_tab);
        AT_WRITE_REG(hw, REG_BASE_CPU_NUMBER, hw->base_cpu);

        if (hw->rrs_type & atl1e_rrs_ipv4)

                rxq_ctrl_data |= RXQ_CTRL_HASH_TYPE_IPV4;

        if (hw->rrs_type & atl1e_rrs_ipv4_tcp)
                rxq_ctrl_data |= RXQ_CTRL_HASH_TYPE_IPV4_TCP;

        if (hw->rrs_type & atl1e_rrs_ipv6)
                rxq_ctrl_data |= RXQ_CTRL_HASH_TYPE_IPV6;

        if (hw->rrs_type & atl1e_rrs_ipv6_tcp)
                rxq_ctrl_data |= RXQ_CTRL_HASH_TYPE_IPV6_TCP;

        if (hw->rrs_type != atl1e_rrs_disable)
                rxq_ctrl_data |=
                        (RXQ_CTRL_HASH_ENABLE | RXQ_CTRL_RSS_MODE_MQUESINT);

        rxq_ctrl_data |= RXQ_CTRL_IPV6_XSUM_VERIFY_EN | RXQ_CTRL_PBA_ALIGN_32 |
                         RXQ_CTRL_CUT_THRU_EN | RXQ_CTRL_EN;

        AT_WRITE_REG(hw, REG_RXQ_CTRL, rxq_ctrl_data);
}

static inline void atl1e_configure_dma(struct atl1e_adapter *adapter)
{
        struct atl1e_hw *hw = &adapter->hw;
        u32 dma_ctrl_data = 0;

        dma_ctrl_data = DMA_CTRL_RXCMB_EN;
        dma_ctrl_data |= (((u32)hw->dmar_block) & DMA_CTRL_DMAR_BURST_LEN_MASK)
                << DMA_CTRL_DMAR_BURST_LEN_SHIFT;
        dma_ctrl_data |= (((u32)hw->dmaw_block) & DMA_CTRL_DMAW_BURST_LEN_MASK)
                << DMA_CTRL_DMAW_BURST_LEN_SHIFT;
        dma_ctrl_data |= DMA_CTRL_DMAR_REQ_PRI | DMA_CTRL_DMAR_OUT_ORDER;
        dma_ctrl_data |= (((u32)hw->dmar_dly_cnt) & DMA_CTRL_DMAR_DLY_CNT_MASK)
                << DMA_CTRL_DMAR_DLY_CNT_SHIFT;
        dma_ctrl_data |= (((u32)hw->dmaw_dly_cnt) & DMA_CTRL_DMAW_DLY_CNT_MASK)
                << DMA_CTRL_DMAW_DLY_CNT_SHIFT;

        AT_WRITE_REG(hw, REG_DMA_CTRL, dma_ctrl_data);
}

static void atl1e_setup_mac_ctrl(struct atl1e_adapter *adapter)
{
        u32 value;
        struct atl1e_hw *hw = &adapter->hw;
        struct net_device *netdev = adapter->netdev;

        /* Config MAC CTRL Register */
        value = MAC_CTRL_TX_EN |
                MAC_CTRL_RX_EN ;

        if (FULL_DUPLEX == adapter->link_duplex)
                value |= MAC_CTRL_DUPLX;

        value |= ((u32)((SPEED_1000 == adapter->link_speed) ?
                          MAC_CTRL_SPEED_1000 : MAC_CTRL_SPEED_10_100) <<
                          MAC_CTRL_SPEED_SHIFT);
        value |= (MAC_CTRL_TX_FLOW | MAC_CTRL_RX_FLOW);

        value |= (MAC_CTRL_ADD_CRC | MAC_CTRL_PAD);
        value |= (((u32)adapter->hw.preamble_len &
                  MAC_CTRL_PRMLEN_MASK) << MAC_CTRL_PRMLEN_SHIFT);

        __atl1e_vlan_mode(netdev->features, &value);

        value |= MAC_CTRL_BC_EN;
        if (netdev->flags & IFF_PROMISC)
                value |= MAC_CTRL_PROMIS_EN;
        if (netdev->flags & IFF_ALLMULTI)
                value |= MAC_CTRL_MC_ALL_EN;
        if (netdev->features & NETIF_F_RXALL)
                value |= MAC_CTRL_DBG;
        AT_WRITE_REG(hw, REG_MAC_CTRL, value);
}

/**
 * atl1e_configure - Configure Transmit&Receive Unit after Reset
 * @adapter: board private structure
 *
 * Configure the Tx /Rx unit of the MAC after a reset.
 */
static int atl1e_configure(struct atl1e_adapter *adapter)
{
        struct atl1e_hw *hw = &adapter->hw;

        u32 intr_status_data = 0;

        /* clear interrupt status */
        AT_WRITE_REG(hw, REG_ISR, ~0);

        /* 1. set MAC Address */
        atl1e_hw_set_mac_addr(hw);

        /* 2. Init the Multicast HASH table done by set_muti */

        /* 3. Clear any WOL status */
        AT_WRITE_REG(hw, REG_WOL_CTRL, 0);

        /* 4. Descripter Ring BaseMem/Length/Read ptr/Write ptr
         *    TPD Ring/SMB/RXF0 Page CMBs, they use the same
         *    High 32bits memory */
        atl1e_configure_des_ring(adapter);

        /* 5. set Interrupt Moderator Timer */
        AT_WRITE_REGW(hw, REG_IRQ_MODU_TIMER_INIT, hw->imt);
        AT_WRITE_REGW(hw, REG_IRQ_MODU_TIMER2_INIT, hw->imt);
        AT_WRITE_REG(hw, REG_MASTER_CTRL, MASTER_CTRL_LED_MODE |
                        MASTER_CTRL_ITIMER_EN | MASTER_CTRL_ITIMER2_EN);

        /* 6. rx/tx threshold to trig interrupt */
        AT_WRITE_REGW(hw, REG_TRIG_RRD_THRESH, hw->rrd_thresh);
        AT_WRITE_REGW(hw, REG_TRIG_TPD_THRESH, hw->tpd_thresh);
        AT_WRITE_REGW(hw, REG_TRIG_RXTIMER, hw->rx_count_down);
        AT_WRITE_REGW(hw, REG_TRIG_TXTIMER, hw->tx_count_down);

        /* 7. set Interrupt Clear Timer */
        AT_WRITE_REGW(hw, REG_CMBDISDMA_TIMER, hw->ict);

        /* 8. set MTU */
        AT_WRITE_REG(hw, REG_MTU, hw->max_frame_size + ETH_HLEN +
                        VLAN_HLEN + ETH_FCS_LEN);

        /* 9. config TXQ early tx threshold */
        atl1e_configure_tx(adapter);

        /* 10. config RXQ */
        atl1e_configure_rx(adapter);

        /* 11. config  DMA Engine */
        atl1e_configure_dma(adapter);

        /* 12. smb timer to trig interrupt */
        AT_WRITE_REG(hw, REG_SMB_STAT_TIMER, hw->smb_timer);

        intr_status_data = AT_READ_REG(hw, REG_ISR);
        if (unlikely((intr_status_data & ISR_PHY_LINKDOWN) != 0)) {
                netdev_err(adapter->netdev,
                           "atl1e_configure failed, PCIE phy link down\n");
                return -1;
        }

        AT_WRITE_REG(hw, REG_ISR, 0x7fffffff);
        return 0;
}

/**
 * atl1e_get_stats - Get System Network Statistics
 * @netdev: network interface device structure
 *
 * Returns the address of the device statistics structure.
 * The statistics are actually updated from the timer callback.
 */
static struct net_device_stats *atl1e_get_stats(struct net_device *netdev)
{
        struct atl1e_adapter *adapter = netdev_priv(netdev);
        struct atl1e_hw_stats  *hw_stats = &adapter->hw_stats;
        struct net_device_stats *net_stats = &netdev->stats;

        net_stats->rx_bytes   = hw_stats->rx_byte_cnt;
        net_stats->tx_bytes   = hw_stats->tx_byte_cnt;
        net_stats->multicast  = hw_stats->rx_mcast;
        net_stats->collisions = hw_stats->tx_1_col +
                                hw_stats->tx_2_col +
                                hw_stats->tx_late_col +
                                hw_stats->tx_abort_col;

        net_stats->rx_errors  = hw_stats->rx_frag +
                                hw_stats->rx_fcs_err +
                                hw_stats->rx_len_err +
                                hw_stats->rx_sz_ov +
                                hw_stats->rx_rrd_ov +
                                hw_stats->rx_align_err +
                                hw_stats->rx_rxf_ov;

        net_stats->rx_fifo_errors   = hw_stats->rx_rxf_ov;
        net_stats->rx_length_errors = hw_stats->rx_len_err;
        net_stats->rx_crc_errors    = hw_stats->rx_fcs_err;
        net_stats->rx_frame_errors  = hw_stats->rx_align_err;
        net_stats->rx_dropped       = hw_stats->rx_rrd_ov;

        net_stats->tx_errors = hw_stats->tx_late_col +
                               hw_stats->tx_abort_col +
                               hw_stats->tx_underrun +
                               hw_stats->tx_trunc;

        net_stats->tx_fifo_errors    = hw_stats->tx_underrun;
        net_stats->tx_aborted_errors = hw_stats->tx_abort_col;
        net_stats->tx_window_errors  = hw_stats->tx_late_col;

        net_stats->rx_packets = hw_stats->rx_ok + net_stats->rx_errors;
        net_stats->tx_packets = hw_stats->tx_ok + net_stats->tx_errors;

        return net_stats;
}

static void atl1e_update_hw_stats(struct atl1e_adapter *adapter)
{
        u16 hw_reg_addr = 0;
        unsigned long *stats_item = NULL;

        /* update rx status */
        hw_reg_addr = REG_MAC_RX_STATUS_BIN;
        stats_item  = &adapter->hw_stats.rx_ok;
        while (hw_reg_addr <= REG_MAC_RX_STATUS_END) {
                *stats_item += AT_READ_REG(&adapter->hw, hw_reg_addr);
                stats_item++;
                hw_reg_addr += 4;
        }
        /* update tx status */
        hw_reg_addr = REG_MAC_TX_STATUS_BIN;
        stats_item  = &adapter->hw_stats.tx_ok;
        while (hw_reg_addr <= REG_MAC_TX_STATUS_END) {
                *stats_item += AT_READ_REG(&adapter->hw, hw_reg_addr);
                stats_item++;
                hw_reg_addr += 4;
        }
}

static inline void atl1e_clear_phy_int(struct atl1e_adapter *adapter)
{
        u16 phy_data;

        spin_lock(&adapter->mdio_lock);
        atl1e_read_phy_reg(&adapter->hw, MII_INT_STATUS, &phy_data);
        spin_unlock(&adapter->mdio_lock);
}

static bool atl1e_clean_tx_irq(struct atl1e_adapter *adapter)
{
        struct atl1e_tx_ring *tx_ring = &adapter->tx_ring;
        struct atl1e_tx_buffer *tx_buffer = NULL;
        u16 hw_next_to_clean = AT_READ_REGW(&adapter->hw, REG_TPD_CONS_IDX);
        u16 next_to_clean = atomic_read(&tx_ring->next_to_clean);

        while (next_to_clean != hw_next_to_clean) {
                tx_buffer = &tx_ring->tx_buffer[next_to_clean];
                if (tx_buffer->dma) {
                        if (tx_buffer->flags & ATL1E_TX_PCIMAP_SINGLE)
                                dma_unmap_single(&adapter->pdev->dev,
                                                 tx_buffer->dma,
                                                 tx_buffer->length,
                                                 DMA_TO_DEVICE);
                        else if (tx_buffer->flags & ATL1E_TX_PCIMAP_PAGE)
                                dma_unmap_page(&adapter->pdev->dev,
                                               tx_buffer->dma,
                                               tx_buffer->length,
                                               DMA_TO_DEVICE);
                        tx_buffer->dma = 0;
                }

                if (tx_buffer->skb) {
                        dev_consume_skb_irq(tx_buffer->skb);
                        tx_buffer->skb = NULL;
                }

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

        atomic_set(&tx_ring->next_to_clean, next_to_clean);

        if (netif_queue_stopped(adapter->netdev) &&
                        netif_carrier_ok(adapter->netdev)) {
                netif_wake_queue(adapter->netdev);
        }

        return true;
}

/**
 * atl1e_intr - Interrupt Handler
 * @irq: interrupt number
 * @data: pointer to a network interface device structure
 */
static irqreturn_t atl1e_intr(int irq, void *data)
{
        struct net_device *netdev  = data;
        struct atl1e_adapter *adapter = netdev_priv(netdev);
        struct atl1e_hw *hw = &adapter->hw;
        int max_ints = AT_MAX_INT_WORK;
        int handled = IRQ_NONE;
        u32 status;

        do {
                status = AT_READ_REG(hw, REG_ISR);
                if ((status & IMR_NORMAL_MASK) == 0 ||
                                (status & ISR_DIS_INT) != 0) {
                        if (max_ints != AT_MAX_INT_WORK)
                                handled = IRQ_HANDLED;
                        break;
                }
                /* link event */
                if (status & ISR_GPHY)
                        atl1e_clear_phy_int(adapter);
                /* Ack ISR */
                AT_WRITE_REG(hw, REG_ISR, status | ISR_DIS_INT);

                handled = IRQ_HANDLED;
                /* check if PCIE PHY Link down */
                if (status & ISR_PHY_LINKDOWN) {
                        netdev_err(adapter->netdev,
                                   "pcie phy linkdown %x\n", status);
                        if (netif_running(adapter->netdev)) {
                                /* reset MAC */
                                atl1e_irq_reset(adapter);
                                schedule_work(&adapter->reset_task);
                                break;
                        }
                }

                /* check if DMA read/write error */
                if (status & (ISR_DMAR_TO_RST | ISR_DMAW_TO_RST)) {
                        netdev_err(adapter->netdev,
                                   "PCIE DMA RW error (status = 0x%x)\n",
                                   status);
                        atl1e_irq_reset(adapter);
                        schedule_work(&adapter->reset_task);
                        break;
                }

                if (status & ISR_SMB)
                        atl1e_update_hw_stats(adapter);

                /* link event */
                if (status & (ISR_GPHY | ISR_MANUAL)) {
                        netdev->stats.tx_carrier_errors++;
                        atl1e_link_chg_event(adapter);
                        break;
                }

                /* transmit event */
                if (status & ISR_TX_EVENT)
                        atl1e_clean_tx_irq(adapter);

                if (status & ISR_RX_EVENT) {
                        /*
                         * disable rx interrupts, without
                         * the synchronize_irq bit
                         */
                        AT_WRITE_REG(hw, REG_IMR,
                                     IMR_NORMAL_MASK & ~ISR_RX_EVENT);
                        AT_WRITE_FLUSH(hw);
                        if (likely(napi_schedule_prep(
                                   &adapter->napi)))
                                __napi_schedule(&adapter->napi);
                }
        } while (--max_ints > 0);
        /* re-enable Interrupt*/
        AT_WRITE_REG(&adapter->hw, REG_ISR, 0);

        return handled;
}

static inline void atl1e_rx_checksum(struct atl1e_adapter *adapter,
                  struct sk_buff *skb, struct atl1e_recv_ret_status *prrs)
{
        u8 *packet = (u8 *)(prrs + 1);
        struct iphdr *iph;
        u16 head_len = ETH_HLEN;
        u16 pkt_flags;
        u16 err_flags;

        skb_checksum_none_assert(skb);
        pkt_flags = prrs->pkt_flag;
        err_flags = prrs->err_flag;
        if (((pkt_flags & RRS_IS_IPV4) || (pkt_flags & RRS_IS_IPV6)) &&
                ((pkt_flags & RRS_IS_TCP) || (pkt_flags & RRS_IS_UDP))) {
                if (pkt_flags & RRS_IS_IPV4) {
                        if (pkt_flags & RRS_IS_802_3)
                                head_len += 8;
                        iph = (struct iphdr *) (packet + head_len);
                        if (iph->frag_off != 0 && !(pkt_flags & RRS_IS_IP_DF))
                                goto hw_xsum;
                }
                if (!(err_flags & (RRS_ERR_IP_CSUM | RRS_ERR_L4_CSUM))) {
                        skb->ip_summed = CHECKSUM_UNNECESSARY;
                        return;
                }
        }

hw_xsum :
        return;
}

static struct atl1e_rx_page *atl1e_get_rx_page(struct atl1e_adapter *adapter,
                                               u8 que)
{
        struct atl1e_rx_page_desc *rx_page_desc =
                (struct atl1e_rx_page_desc *) adapter->rx_ring.rx_page_desc;
        u8 rx_using = rx_page_desc[que].rx_using;

        return &(rx_page_desc[que].rx_page[rx_using]);
}

static void atl1e_clean_rx_irq(struct atl1e_adapter *adapter, u8 que,
                   int *work_done, int work_to_do)
{
        struct net_device *netdev  = adapter->netdev;
        struct atl1e_rx_ring *rx_ring = &adapter->rx_ring;
        struct atl1e_rx_page_desc *rx_page_desc =
                (struct atl1e_rx_page_desc *) rx_ring->rx_page_desc;
        struct sk_buff *skb = NULL;
        struct atl1e_rx_page *rx_page = atl1e_get_rx_page(adapter, que);
        u32 packet_size, write_offset;
        struct atl1e_recv_ret_status *prrs;

        write_offset = *(rx_page->write_offset_addr);
        if (likely(rx_page->read_offset < write_offset)) {
                do {
                        if (*work_done >= work_to_do)
                                break;
                        (*work_done)++;
                        /* get new packet's  rrs */
                        prrs = (struct atl1e_recv_ret_status *) (rx_page->addr +
                                                 rx_page->read_offset);
                        /* check sequence number */
                        if (prrs->seq_num != rx_page_desc[que].rx_nxseq) {
                                netdev_err(netdev,
                                           "rx sequence number error (rx=%d) (expect=%d)\n",
                                           prrs->seq_num,
                                           rx_page_desc[que].rx_nxseq);
                                rx_page_desc[que].rx_nxseq++;
                                /* just for debug use */
                                AT_WRITE_REG(&adapter->hw, REG_DEBUG_DATA0,
                                             (((u32)prrs->seq_num) << 16) |
                                             rx_page_desc[que].rx_nxseq);
                                goto fatal_err;
                        }
                        rx_page_desc[que].rx_nxseq++;

                        /* error packet */
                        if ((prrs->pkt_flag & RRS_IS_ERR_FRAME) &&
                            !(netdev->features & NETIF_F_RXALL)) {
                                if (prrs->err_flag & (RRS_ERR_BAD_CRC |
                                        RRS_ERR_DRIBBLE | RRS_ERR_CODE |
                                        RRS_ERR_TRUNC)) {
                                /* hardware error, discard this packet*/
                                        netdev_err(netdev,
                                                   "rx packet desc error %x\n",
                                                   *((u32 *)prrs + 1));
                                        goto skip_pkt;
                                }
                        }

                        packet_size = ((prrs->word1 >> RRS_PKT_SIZE_SHIFT) &
                                        RRS_PKT_SIZE_MASK);
                        if (likely(!(netdev->features & NETIF_F_RXFCS)))
                                packet_size -= 4; /* CRC */

                        skb = netdev_alloc_skb_ip_align(netdev, packet_size);
                        if (skb == NULL)
                                goto skip_pkt;

                        memcpy(skb->data, (u8 *)(prrs + 1), packet_size);
                        skb_put(skb, packet_size);
                        skb->protocol = eth_type_trans(skb, netdev);
                        atl1e_rx_checksum(adapter, skb, prrs);

                        if (prrs->pkt_flag & RRS_IS_VLAN_TAG) {
                                u16 vlan_tag = (prrs->vtag >> 4) |
                                               ((prrs->vtag & 7) << 13) |
                                               ((prrs->vtag & 8) << 9);
                                netdev_dbg(netdev,
                                           "RXD VLAN TAG<RRD>=0x%04x\n",
                                           prrs->vtag);
                                __vlan_hwaccel_put_tag(skb, htons(ETH_P_8021Q), vlan_tag);
                        }
                        napi_gro_receive(&adapter->napi, skb);

skip_pkt:
        /* skip current packet whether it's ok or not. */
                        rx_page->read_offset +=
                                (((u32)((prrs->word1 >> RRS_PKT_SIZE_SHIFT) &
                                RRS_PKT_SIZE_MASK) +
                                sizeof(struct atl1e_recv_ret_status) + 31) &
                                                0xFFFFFFE0);

                        if (rx_page->read_offset >= rx_ring->page_size) {
                                /* mark this page clean */
                                u16 reg_addr;
                                u8  rx_using;

                                rx_page->read_offset =
                                        *(rx_page->write_offset_addr) = 0;
                                rx_using = rx_page_desc[que].rx_using;
                                reg_addr =
                                        atl1e_rx_page_vld_regs[que][rx_using];
                                AT_WRITE_REGB(&adapter->hw, reg_addr, 1);
                                rx_page_desc[que].rx_using ^= 1;
                                rx_page = atl1e_get_rx_page(adapter, que);
                        }
                        write_offset = *(rx_page->write_offset_addr);
                } while (rx_page->read_offset < write_offset);
        }

        return;

fatal_err:
        if (!test_bit(__AT_DOWN, &adapter->flags))
                schedule_work(&adapter->reset_task);
}

/**
 * atl1e_clean - NAPI Rx polling callback
 * @napi: napi info
 * @budget: number of packets to clean
 */
static int atl1e_clean(struct napi_struct *napi, int budget)
{
        struct atl1e_adapter *adapter =
                        container_of(napi, struct atl1e_adapter, napi);
        u32 imr_data;
        int work_done = 0;

        /* Keep link state information with original netdev */
        if (!netif_carrier_ok(adapter->netdev))
                goto quit_polling;

        atl1e_clean_rx_irq(adapter, 0, &work_done, budget);

        /* If no Tx and not enough Rx work done, exit the polling mode */
        if (work_done < budget) {
quit_polling:
                napi_complete_done(napi, work_done);
                imr_data = AT_READ_REG(&adapter->hw, REG_IMR);
                AT_WRITE_REG(&adapter->hw, REG_IMR, imr_data | ISR_RX_EVENT);
                /* test debug */
                if (test_bit(__AT_DOWN, &adapter->flags)) {
                        atomic_dec(&adapter->irq_sem);
                        netdev_err(adapter->netdev,
                                   "atl1e_clean is called when AT_DOWN\n");
                }
                /* reenable RX intr */
                /*atl1e_irq_enable(adapter); */

        }
        return work_done;
}

#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 atl1e_netpoll(struct net_device *netdev)
{
        struct atl1e_adapter *adapter = netdev_priv(netdev);

        disable_irq(adapter->pdev->irq);
        atl1e_intr(adapter->pdev->irq, netdev);
        enable_irq(adapter->pdev->irq);
}
#endif

static inline u16 atl1e_tpd_avail(struct atl1e_adapter *adapter)
{
        struct atl1e_tx_ring *tx_ring = &adapter->tx_ring;
        u16 next_to_use = 0;
        u16 next_to_clean = 0;

        next_to_clean = atomic_read(&tx_ring->next_to_clean);
        next_to_use   = tx_ring->next_to_use;

        return (u16)(next_to_clean > next_to_use) ?
                (next_to_clean - next_to_use - 1) :
                (tx_ring->count + next_to_clean - next_to_use - 1);
}

/*
 * get next usable tpd
 * Note: should call atl1e_tdp_avail to make sure
 * there is enough tpd to use
 */
static struct atl1e_tpd_desc *atl1e_get_tpd(struct atl1e_adapter *adapter)
{
        struct atl1e_tx_ring *tx_ring = &adapter->tx_ring;
        u16 next_to_use = 0;

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

        memset(&tx_ring->desc[next_to_use], 0, sizeof(struct atl1e_tpd_desc));
        return &tx_ring->desc[next_to_use];
}

static struct atl1e_tx_buffer *
atl1e_get_tx_buffer(struct atl1e_adapter *adapter, struct atl1e_tpd_desc *tpd)
{
        struct atl1e_tx_ring *tx_ring = &adapter->tx_ring;

        return &tx_ring->tx_buffer[tpd - tx_ring->desc];
}

/* Calculate the transmit packet descript needed*/
static u16 atl1e_cal_tdp_req(const struct sk_buff *skb)
{
        int i = 0;
        u16 tpd_req = 1;
        u16 fg_size = 0;
        u16 proto_hdr_len = 0;

        for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
                fg_size = skb_frag_size(&skb_shinfo(skb)->frags[i]);
                tpd_req += ((fg_size + MAX_TX_BUF_LEN - 1) >> MAX_TX_BUF_SHIFT);
        }

        if (skb_is_gso(skb)) {
                if (skb->protocol == htons(ETH_P_IP) ||
                   (skb_shinfo(skb)->gso_type == SKB_GSO_TCPV6)) {
                        proto_hdr_len = skb_transport_offset(skb) +
                                        tcp_hdrlen(skb);
                        if (proto_hdr_len < skb_headlen(skb)) {
                                tpd_req += ((skb_headlen(skb) - proto_hdr_len +
                                           MAX_TX_BUF_LEN - 1) >>
                                           MAX_TX_BUF_SHIFT);
                        }
                }

        }
        return tpd_req;
}

static int atl1e_tso_csum(struct atl1e_adapter *adapter,
                       struct sk_buff *skb, struct atl1e_tpd_desc *tpd)
{
        unsigned short offload_type;
        u8 hdr_len;
        u32 real_len;

        if (skb_is_gso(skb)) {
                int err;

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

                offload_type = skb_shinfo(skb)->gso_type;

                if (offload_type & SKB_GSO_TCPV4) {
                        real_len = (((unsigned char *)ip_hdr(skb) - skb->data)
                                        + ntohs(ip_hdr(skb)->tot_len));

                        if (real_len < skb->len)
                                pskb_trim(skb, real_len);

                        hdr_len = (skb_transport_offset(skb) + tcp_hdrlen(skb));
                        if (unlikely(skb->len == hdr_len)) {
                                /* only xsum need */
                                netdev_warn(adapter->netdev,
                                            "IPV4 tso with zero data??\n");
                                goto check_sum;
                        } else {
                                ip_hdr(skb)->check = 0;
                                ip_hdr(skb)->tot_len = 0;
                                tcp_hdr(skb)->check = ~csum_tcpudp_magic(
                                                        ip_hdr(skb)->saddr,
                                                        ip_hdr(skb)->daddr,
                                                        0, IPPROTO_TCP, 0);
                                tpd->word3 |= (ip_hdr(skb)->ihl &
                                        TDP_V4_IPHL_MASK) <<
                                        TPD_V4_IPHL_SHIFT;
                                tpd->word3 |= ((tcp_hdrlen(skb) >> 2) &
                                        TPD_TCPHDRLEN_MASK) <<
                                        TPD_TCPHDRLEN_SHIFT;
                                tpd->word3 |= ((skb_shinfo(skb)->gso_size) &
                                        TPD_MSS_MASK) << TPD_MSS_SHIFT;
                                tpd->word3 |= 1 << TPD_SEGMENT_EN_SHIFT;
                        }
                        return 0;
                }
        }

check_sum:
        if (likely(skb->ip_summed == CHECKSUM_PARTIAL)) {
                u8 css, cso;

                cso = skb_checksum_start_offset(skb);
                if (unlikely(cso & 0x1)) {
                        netdev_err(adapter->netdev,
                                   "payload offset should not ant event number\n");
                        return -1;
                } else {
                        css = cso + skb->csum_offset;
                        tpd->word3 |= (cso & TPD_PLOADOFFSET_MASK) <<
                                        TPD_PLOADOFFSET_SHIFT;
                        tpd->word3 |= (css & TPD_CCSUMOFFSET_MASK) <<
                                        TPD_CCSUMOFFSET_SHIFT;
                        tpd->word3 |= 1 << TPD_CC_SEGMENT_EN_SHIFT;
                }
        }

        return 0;
}

static int atl1e_tx_map(struct atl1e_adapter *adapter,
                        struct sk_buff *skb, struct atl1e_tpd_desc *tpd)
{
        struct atl1e_tpd_desc *use_tpd = NULL;
        struct atl1e_tx_buffer *tx_buffer = NULL;
        u16 buf_len = skb_headlen(skb);
        u16 map_len = 0;
        u16 mapped_len = 0;
        u16 hdr_len = 0;
        u16 nr_frags;
        u16 f;
        int segment;
        int ring_start = adapter->tx_ring.next_to_use;
        int ring_end;

        nr_frags = skb_shinfo(skb)->nr_frags;
        segment = (tpd->word3 >> TPD_SEGMENT_EN_SHIFT) & TPD_SEGMENT_EN_MASK;
        if (segment) {
                /* TSO */
                map_len = hdr_len = skb_transport_offset(skb) + tcp_hdrlen(skb);
                use_tpd = tpd;

                tx_buffer = atl1e_get_tx_buffer(adapter, use_tpd);
                tx_buffer->length = map_len;
                tx_buffer->dma = dma_map_single(&adapter->pdev->dev,
                                                skb->data, hdr_len,
                                                DMA_TO_DEVICE);
                if (dma_mapping_error(&adapter->pdev->dev, tx_buffer->dma))
                        return -ENOSPC;

                ATL1E_SET_PCIMAP_TYPE(tx_buffer, ATL1E_TX_PCIMAP_SINGLE);
                mapped_len += map_len;
                use_tpd->buffer_addr = cpu_to_le64(tx_buffer->dma);
                use_tpd->word2 = (use_tpd->word2 & (~TPD_BUFLEN_MASK)) |
                        ((cpu_to_le32(tx_buffer->length) &
                        TPD_BUFLEN_MASK) << TPD_BUFLEN_SHIFT);
        }

        while (mapped_len < buf_len) {
                /* mapped_len == 0, means we should use the first tpd,
                   which is given by caller  */
                if (mapped_len == 0) {
                        use_tpd = tpd;
                } else {
                        use_tpd = atl1e_get_tpd(adapter);
                        memcpy(use_tpd, tpd, sizeof(struct atl1e_tpd_desc));
                }
                tx_buffer = atl1e_get_tx_buffer(adapter, use_tpd);
                tx_buffer->skb = NULL;

                tx_buffer->length = map_len =
                        ((buf_len - mapped_len) >= MAX_TX_BUF_LEN) ?
                        MAX_TX_BUF_LEN : (buf_len - mapped_len);
                tx_buffer->dma =
                        dma_map_single(&adapter->pdev->dev,
                                       skb->data + mapped_len, map_len,
                                       DMA_TO_DEVICE);

                if (dma_mapping_error(&adapter->pdev->dev, tx_buffer->dma)) {
                        /* We need to unwind the mappings we've done */
                        ring_end = adapter->tx_ring.next_to_use;
                        adapter->tx_ring.next_to_use = ring_start;
                        while (adapter->tx_ring.next_to_use != ring_end) {
                                tpd = atl1e_get_tpd(adapter);
                                tx_buffer = atl1e_get_tx_buffer(adapter, tpd);
                                dma_unmap_single(&adapter->pdev->dev,
                                                 tx_buffer->dma,
                                                 tx_buffer->length,
                                                 DMA_TO_DEVICE);
                        }
                        /* Reset the tx rings next pointer */
                        adapter->tx_ring.next_to_use = ring_start;
                        return -ENOSPC;
                }

                ATL1E_SET_PCIMAP_TYPE(tx_buffer, ATL1E_TX_PCIMAP_SINGLE);
                mapped_len  += map_len;
                use_tpd->buffer_addr = cpu_to_le64(tx_buffer->dma);
                use_tpd->word2 = (use_tpd->word2 & (~TPD_BUFLEN_MASK)) |
                        ((cpu_to_le32(tx_buffer->length) &
                        TPD_BUFLEN_MASK) << TPD_BUFLEN_SHIFT);
        }

        for (f = 0; f < nr_frags; f++) {
                const skb_frag_t *frag = &skb_shinfo(skb)->frags[f];
                u16 i;
                u16 seg_num;

                buf_len = skb_frag_size(frag);

                seg_num = (buf_len + MAX_TX_BUF_LEN - 1) / MAX_TX_BUF_LEN;
                for (i = 0; i < seg_num; i++) {
                        use_tpd = atl1e_get_tpd(adapter);
                        memcpy(use_tpd, tpd, sizeof(struct atl1e_tpd_desc));

                        tx_buffer = atl1e_get_tx_buffer(adapter, use_tpd);
                        BUG_ON(tx_buffer->skb);

                        tx_buffer->skb = NULL;
                        tx_buffer->length =
                                (buf_len > MAX_TX_BUF_LEN) ?
                                MAX_TX_BUF_LEN : buf_len;
                        buf_len -= tx_buffer->length;

                        tx_buffer->dma = skb_frag_dma_map(&adapter->pdev->dev,
                                                          frag,
                                                          (i * MAX_TX_BUF_LEN),
                                                          tx_buffer->length,
                                                          DMA_TO_DEVICE);

                        if (dma_mapping_error(&adapter->pdev->dev, tx_buffer->dma)) {
                                /* We need to unwind the mappings we've done */
                                ring_end = adapter->tx_ring.next_to_use;
                                adapter->tx_ring.next_to_use = ring_start;
                                while (adapter->tx_ring.next_to_use != ring_end) {
                                        tpd = atl1e_get_tpd(adapter);
                                        tx_buffer = atl1e_get_tx_buffer(adapter, tpd);
                                        dma_unmap_page(&adapter->pdev->dev, tx_buffer->dma,
                                                       tx_buffer->length, DMA_TO_DEVICE);
                                }

                                /* Reset the ring next to use pointer */
                                adapter->tx_ring.next_to_use = ring_start;
                                return -ENOSPC;
                        }

                        ATL1E_SET_PCIMAP_TYPE(tx_buffer, ATL1E_TX_PCIMAP_PAGE);
                        use_tpd->buffer_addr = cpu_to_le64(tx_buffer->dma);
                        use_tpd->word2 = (use_tpd->word2 & (~TPD_BUFLEN_MASK)) |
                                        ((cpu_to_le32(tx_buffer->length) &
                                        TPD_BUFLEN_MASK) << TPD_BUFLEN_SHIFT);
                }
        }

        if ((tpd->word3 >> TPD_SEGMENT_EN_SHIFT) & TPD_SEGMENT_EN_MASK)
                /* note this one is a tcp header */
                tpd->word3 |= 1 << TPD_HDRFLAG_SHIFT;
        /* The last tpd */

        use_tpd->word3 |= 1 << TPD_EOP_SHIFT;
        /* The last buffer info contain the skb address,
           so it will be free after unmap */
        tx_buffer->skb = skb;
        return 0;
}

static void atl1e_tx_queue(struct atl1e_adapter *adapter, u16 count,
                           struct atl1e_tpd_desc *tpd)
{
        struct atl1e_tx_ring *tx_ring = &adapter->tx_ring;
        /* 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). */
        wmb();
        AT_WRITE_REG(&adapter->hw, REG_MB_TPD_PROD_IDX, tx_ring->next_to_use);
}

static netdev_tx_t atl1e_xmit_frame(struct sk_buff *skb,
                                          struct net_device *netdev)
{
        struct atl1e_adapter *adapter = netdev_priv(netdev);
        u16 tpd_req = 1;
        struct atl1e_tpd_desc *tpd;

        if (test_bit(__AT_DOWN, &adapter->flags)) {
                dev_kfree_skb_any(skb);
                return NETDEV_TX_OK;
        }

        if (unlikely(skb->len <= 0)) {
                dev_kfree_skb_any(skb);
                return NETDEV_TX_OK;
        }
        tpd_req = atl1e_cal_tdp_req(skb);

        if (atl1e_tpd_avail(adapter) < tpd_req) {
                /* no enough descriptor, just stop queue */
                netif_stop_queue(netdev);
                return NETDEV_TX_BUSY;
        }

        tpd = atl1e_get_tpd(adapter);

        if (skb_vlan_tag_present(skb)) {
                u16 vlan_tag = skb_vlan_tag_get(skb);
                u16 atl1e_vlan_tag;

                tpd->word3 |= 1 << TPD_INS_VL_TAG_SHIFT;
                AT_VLAN_TAG_TO_TPD_TAG(vlan_tag, atl1e_vlan_tag);
                tpd->word2 |= (atl1e_vlan_tag & TPD_VLANTAG_MASK) <<
                                TPD_VLAN_SHIFT;
        }

        if (skb->protocol == htons(ETH_P_8021Q))
                tpd->word3 |= 1 << TPD_VL_TAGGED_SHIFT;

        if (skb_network_offset(skb) != ETH_HLEN)
                tpd->word3 |= 1 << TPD_ETHTYPE_SHIFT; /* 802.3 frame */

        /* do TSO and check sum */
        if (atl1e_tso_csum(adapter, skb, tpd) != 0) {
                dev_kfree_skb_any(skb);
                return NETDEV_TX_OK;
        }

        if (atl1e_tx_map(adapter, skb, tpd)) {
                dev_kfree_skb_any(skb);
                goto out;
        }

        atl1e_tx_queue(adapter, tpd_req, tpd);
out:
        return NETDEV_TX_OK;
}

static void atl1e_free_irq(struct atl1e_adapter *adapter)
{
        struct net_device *netdev = adapter->netdev;

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

static int atl1e_request_irq(struct atl1e_adapter *adapter)
{
        struct pci_dev    *pdev   = adapter->pdev;
        struct net_device *netdev = adapter->netdev;
        int err = 0;

        err = request_irq(pdev->irq, atl1e_intr, IRQF_SHARED, netdev->name,
                          netdev);
        if (err) {
                netdev_dbg(adapter->netdev,
                           "Unable to allocate interrupt Error: %d\n", err);
                return err;
        }
        netdev_dbg(netdev, "atl1e_request_irq OK\n");
        return err;
}

int atl1e_up(struct atl1e_adapter *adapter)
{
        struct net_device *netdev = adapter->netdev;
        int err = 0;
        u32 val;

        /* hardware has been reset, we need to reload some things */
        err = atl1e_init_hw(&adapter->hw);
        if (err) {
                err = -EIO;
                return err;
        }
        atl1e_init_ring_ptrs(adapter);
        atl1e_set_multi(netdev);
        atl1e_restore_vlan(adapter);

        if (atl1e_configure(adapter)) {
                err = -EIO;
                goto err_up;
        }

        clear_bit(__AT_DOWN, &adapter->flags);
        napi_enable(&adapter->napi);
        atl1e_irq_enable(adapter);
        val = AT_READ_REG(&adapter->hw, REG_MASTER_CTRL);
        AT_WRITE_REG(&adapter->hw, REG_MASTER_CTRL,
                      val | MASTER_CTRL_MANUAL_INT);

err_up:
        return err;
}

void atl1e_down(struct atl1e_adapter *adapter)
{
        struct net_device *netdev = adapter->netdev;

        /* signal that we're down so the interrupt handler does not
         * reschedule our watchdog timer */
        set_bit(__AT_DOWN, &adapter->flags);

        netif_stop_queue(netdev);

        /* reset MAC to disable all RX/TX */
        atl1e_reset_hw(&adapter->hw);
        msleep(1);

        napi_disable(&adapter->napi);
        atl1e_del_timer(adapter);
        atl1e_irq_disable(adapter);

        netif_carrier_off(netdev);
        adapter->link_speed = SPEED_0;
        adapter->link_duplex = -1;
        atl1e_clean_tx_ring(adapter);
        atl1e_clean_rx_ring(adapter);
}

/**
 * atl1e_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 timer is started,
 * and the stack is notified that the interface is ready.
 */
static int atl1e_open(struct net_device *netdev)
{
        struct atl1e_adapter *adapter = netdev_priv(netdev);
        int err;

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

        /* allocate rx/tx dma buffer & descriptors */
        atl1e_init_ring_resources(adapter);
        err = atl1e_setup_ring_resources(adapter);
        if (unlikely(err))
                return err;

        err = atl1e_request_irq(adapter);
        if (unlikely(err))
                goto err_req_irq;

        err = atl1e_up(adapter);
        if (unlikely(err))
                goto err_up;

        return 0;

err_up:
        atl1e_free_irq(adapter);
err_req_irq:
        atl1e_free_ring_resources(adapter);
        atl1e_reset_hw(&adapter->hw);

        return err;
}

/**
 * atl1e_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.
 */
static int atl1e_close(struct net_device *netdev)
{
        struct atl1e_adapter *adapter = netdev_priv(netdev);

        WARN_ON(test_bit(__AT_RESETTING, &adapter->flags));
        atl1e_down(adapter);
        atl1e_free_irq(adapter);
        atl1e_free_ring_resources(adapter);

        return 0;
}

static int atl1e_suspend(struct pci_dev *pdev, pm_message_t state)
{
        struct net_device *netdev = pci_get_drvdata(pdev);
        struct atl1e_adapter *adapter = netdev_priv(netdev);
        struct atl1e_hw *hw = &adapter->hw;
        u32 ctrl = 0;
        u32 mac_ctrl_data = 0;
        u32 wol_ctrl_data = 0;
        u16 mii_advertise_data = 0;
        u16 mii_bmsr_data = 0;
        u16 mii_intr_status_data = 0;
        u32 wufc = adapter->wol;
        u32 i;
#ifdef CONFIG_PM
        int retval = 0;
#endif

        if (netif_running(netdev)) {
                WARN_ON(test_bit(__AT_RESETTING, &adapter->flags));
                atl1e_down(adapter);
        }
        netif_device_detach(netdev);

#ifdef CONFIG_PM
        retval = pci_save_state(pdev);
        if (retval)
                return retval;
#endif

        if (wufc) {
                /* get link status */
                atl1e_read_phy_reg(hw, MII_BMSR, &mii_bmsr_data);
                atl1e_read_phy_reg(hw, MII_BMSR, &mii_bmsr_data);

                mii_advertise_data = ADVERTISE_10HALF;

                if ((atl1e_write_phy_reg(hw, MII_CTRL1000, 0) != 0) ||
                    (atl1e_write_phy_reg(hw,
                           MII_ADVERTISE, mii_advertise_data) != 0) ||
                    (atl1e_phy_commit(hw)) != 0) {
                        netdev_dbg(adapter->netdev, "set phy register failed\n");
                        goto wol_dis;
                }

                hw->phy_configured = false; /* re-init PHY when resume */

                /* turn on magic packet wol */
                if (wufc & AT_WUFC_MAG)
                        wol_ctrl_data |= WOL_MAGIC_EN | WOL_MAGIC_PME_EN;

                if (wufc & AT_WUFC_LNKC) {
                /* if orignal link status is link, just wait for retrive link */
                        if (mii_bmsr_data & BMSR_LSTATUS) {
                                for (i = 0; i < AT_SUSPEND_LINK_TIMEOUT; i++) {
                                        msleep(100);
                                        atl1e_read_phy_reg(hw, MII_BMSR,
                                                        &mii_bmsr_data);
                                        if (mii_bmsr_data & BMSR_LSTATUS)
                                                break;
                                }

                                if ((mii_bmsr_data & BMSR_LSTATUS) == 0)
                                        netdev_dbg(adapter->netdev,
                                                   "Link may change when suspend\n");
                        }
                        wol_ctrl_data |=  WOL_LINK_CHG_EN | WOL_LINK_CHG_PME_EN;
                        /* only link up can wake up */
                        if (atl1e_write_phy_reg(hw, MII_INT_CTRL, 0x400) != 0) {
                                netdev_dbg(adapter->netdev,
                                           "read write phy register failed\n");
                                goto wol_dis;
                        }
                }
                /* clear phy interrupt */
                atl1e_read_phy_reg(hw, MII_INT_STATUS, &mii_intr_status_data);
                /* Config MAC Ctrl register */
                mac_ctrl_data = MAC_CTRL_RX_EN;
                /* set to 10/100M halt duplex */
                mac_ctrl_data |= MAC_CTRL_SPEED_10_100 << MAC_CTRL_SPEED_SHIFT;
                mac_ctrl_data |= (((u32)adapter->hw.preamble_len &
                                 MAC_CTRL_PRMLEN_MASK) <<
                                 MAC_CTRL_PRMLEN_SHIFT);

                __atl1e_vlan_mode(netdev->features, &mac_ctrl_data);

                /* magic packet maybe Broadcast&multicast&Unicast frame */
                if (wufc & AT_WUFC_MAG)
                        mac_ctrl_data |= MAC_CTRL_BC_EN;

                netdev_dbg(adapter->netdev, "suspend MAC=0x%x\n",
                           mac_ctrl_data);

                AT_WRITE_REG(hw, REG_WOL_CTRL, wol_ctrl_data);
                AT_WRITE_REG(hw, REG_MAC_CTRL, mac_ctrl_data);
                /* pcie patch */
                ctrl = AT_READ_REG(hw, REG_PCIE_PHYMISC);
                ctrl |= PCIE_PHYMISC_FORCE_RCV_DET;
                AT_WRITE_REG(hw, REG_PCIE_PHYMISC, ctrl);
                pci_enable_wake(pdev, pci_choose_state(pdev, state), 1);
                goto suspend_exit;
        }
wol_dis:

        /* WOL disabled */
        AT_WRITE_REG(hw, REG_WOL_CTRL, 0);

        /* pcie patch */
        ctrl = AT_READ_REG(hw, REG_PCIE_PHYMISC);
        ctrl |= PCIE_PHYMISC_FORCE_RCV_DET;
        AT_WRITE_REG(hw, REG_PCIE_PHYMISC, ctrl);

        atl1e_force_ps(hw);
        hw->phy_configured = false; /* re-init PHY when resume */

        pci_enable_wake(pdev, pci_choose_state(pdev, state), 0);

suspend_exit:

        if (netif_running(netdev))
                atl1e_free_irq(adapter);

        pci_disable_device(pdev);

        pci_set_power_state(pdev, pci_choose_state(pdev, state));

        return 0;
}

#ifdef CONFIG_PM
static int atl1e_resume(struct pci_dev *pdev)
{
        struct net_device *netdev = pci_get_drvdata(pdev);
        struct atl1e_adapter *adapter = netdev_priv(netdev);
        u32 err;

        pci_set_power_state(pdev, PCI_D0);
        pci_restore_state(pdev);

        err = pci_enable_device(pdev);
        if (err) {
                netdev_err(adapter->netdev,
                           "Cannot enable PCI device from suspend\n");
                return err;
        }

        pci_set_master(pdev);

        AT_READ_REG(&adapter->hw, REG_WOL_CTRL); /* clear WOL status */

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

        AT_WRITE_REG(&adapter->hw, REG_WOL_CTRL, 0);

        if (netif_running(netdev)) {
                err = atl1e_request_irq(adapter);
                if (err)
                        return err;
        }

        atl1e_reset_hw(&adapter->hw);

        if (netif_running(netdev))
                atl1e_up(adapter);

        netif_device_attach(netdev);

        return 0;
}
#endif

static void atl1e_shutdown(struct pci_dev *pdev)
{
        atl1e_suspend(pdev, PMSG_SUSPEND);
}

static const struct net_device_ops atl1e_netdev_ops = {
        .ndo_open               = atl1e_open,
        .ndo_stop               = atl1e_close,
        .ndo_start_xmit         = atl1e_xmit_frame,
        .ndo_get_stats          = atl1e_get_stats,
        .ndo_set_rx_mode        = atl1e_set_multi,
        .ndo_validate_addr      = eth_validate_addr,
        .ndo_set_mac_address    = atl1e_set_mac_addr,
        .ndo_fix_features       = atl1e_fix_features,
        .ndo_set_features       = atl1e_set_features,
        .ndo_change_mtu         = atl1e_change_mtu,
        .ndo_eth_ioctl          = atl1e_ioctl,
        .ndo_tx_timeout         = atl1e_tx_timeout,
#ifdef CONFIG_NET_POLL_CONTROLLER
        .ndo_poll_controller    = atl1e_netpoll,
#endif

};

static int atl1e_init_netdev(struct net_device *netdev, struct pci_dev *pdev)
{
        SET_NETDEV_DEV(netdev, &pdev->dev);
        pci_set_drvdata(pdev, netdev);

        netdev->netdev_ops = &atl1e_netdev_ops;

        netdev->watchdog_timeo = AT_TX_WATCHDOG;
        /* MTU range: 42 - 8170 */
        netdev->min_mtu = ETH_ZLEN - (ETH_HLEN + VLAN_HLEN);
        netdev->max_mtu = MAX_JUMBO_FRAME_SIZE -
                          (ETH_HLEN + ETH_FCS_LEN + VLAN_HLEN);
        atl1e_set_ethtool_ops(netdev);

        netdev->hw_features = NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_TSO |
                              NETIF_F_HW_VLAN_CTAG_RX;
        netdev->features = netdev->hw_features | NETIF_F_HW_VLAN_CTAG_TX;
        /* not enabled by default */
        netdev->hw_features |= NETIF_F_RXALL | NETIF_F_RXFCS;
        return 0;
}

/**
 * atl1e_probe - Device Initialization Routine
 * @pdev: PCI device information struct
 * @ent: entry in atl1e_pci_tbl
 *
 * Returns 0 on success, negative on failure
 *
 * atl1e_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 atl1e_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
{
        struct net_device *netdev;
        struct atl1e_adapter *adapter = NULL;
        static int cards_found;

        int err = 0;

        err = pci_enable_device(pdev);
        if (err) {
                dev_err(&pdev->dev, "cannot enable PCI device\n");
                return err;
        }

        /*
         * The atl1e chip can DMA to 64-bit addresses, but it uses a single
         * shared register for the high 32 bits, so only a single, aligned,
         * 4 GB physical address range can be used at a time.
         *
         * Supporting 64-bit DMA on this hardware is more trouble than it's
         * worth.  It is far easier to limit to 32-bit DMA than update
         * various kernel subsystems to support the mechanics required by a
         * fixed-high-32-bit system.
         */
        err = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32));
        if (err) {
                dev_err(&pdev->dev, "No usable DMA configuration,aborting\n");
                goto err_dma;
        }

        err = pci_request_regions(pdev, atl1e_driver_name);
        if (err) {
                dev_err(&pdev->dev, "cannot obtain PCI resources\n");
                goto err_pci_reg;
        }

        pci_set_master(pdev);

        netdev = alloc_etherdev(sizeof(struct atl1e_adapter));
        if (netdev == NULL) {
                err = -ENOMEM;
                goto err_alloc_etherdev;
        }

        err = atl1e_init_netdev(netdev, pdev);
        if (err) {
                netdev_err(netdev, "init netdevice failed\n");
                goto err_init_netdev;
        }
        adapter = netdev_priv(netdev);
        adapter->bd_number = cards_found;
        adapter->netdev = netdev;
        adapter->pdev = pdev;
        adapter->hw.adapter = adapter;
        adapter->hw.hw_addr = pci_iomap(pdev, BAR_0, 0);
        if (!adapter->hw.hw_addr) {
                err = -EIO;
                netdev_err(netdev, "cannot map device registers\n");
                goto err_ioremap;
        }

        /* init mii data */
        adapter->mii.dev = netdev;
        adapter->mii.mdio_read  = atl1e_mdio_read;
        adapter->mii.mdio_write = atl1e_mdio_write;
        adapter->mii.phy_id_mask = 0x1f;
        adapter->mii.reg_num_mask = MDIO_REG_ADDR_MASK;

        netif_napi_add(netdev, &adapter->napi, atl1e_clean, 64);

        timer_setup(&adapter->phy_config_timer, atl1e_phy_config, 0);

        /* get user settings */
        atl1e_check_options(adapter);
        /*
         * Mark all PCI regions associated with PCI device
         * pdev as being reserved by owner atl1e_driver_name
         * Enables bus-mastering on the device and calls
         * pcibios_set_master to do the needed arch specific settings
         */
        atl1e_setup_pcicmd(pdev);
        /* setup the private structure */
        err = atl1e_sw_init(adapter);
        if (err) {
                netdev_err(netdev, "net device private data init failed\n");
                goto err_sw_init;
        }

        /* Init GPHY as early as possible due to power saving issue  */
        atl1e_phy_init(&adapter->hw);
        /* reset the controller to
         * put the device in a known good starting state */
        err = atl1e_reset_hw(&adapter->hw);
        if (err) {
                err = -EIO;
                goto err_reset;
        }

        if (atl1e_read_mac_addr(&adapter->hw) != 0) {
                err = -EIO;
                netdev_err(netdev, "get mac address failed\n");
                goto err_eeprom;
        }

        memcpy(netdev->dev_addr, adapter->hw.mac_addr, netdev->addr_len);
        netdev_dbg(netdev, "mac address : %pM\n", adapter->hw.mac_addr);

        INIT_WORK(&adapter->reset_task, atl1e_reset_task);
        INIT_WORK(&adapter->link_chg_task, atl1e_link_chg_task);
        netif_set_gso_max_size(netdev, MAX_TSO_SEG_SIZE);
        err = register_netdev(netdev);
        if (err) {
                netdev_err(netdev, "register netdevice failed\n");
                goto err_register;
        }

        /* assume we have no link for now */
        netif_stop_queue(netdev);
        netif_carrier_off(netdev);

        cards_found++;

        return 0;

err_reset:
err_register:
err_sw_init:
err_eeprom:
        pci_iounmap(pdev, adapter->hw.hw_addr);
err_init_netdev:
err_ioremap:
        free_netdev(netdev);
err_alloc_etherdev:
        pci_release_regions(pdev);
err_pci_reg:
err_dma:
        pci_disable_device(pdev);
        return err;
}

/**
 * atl1e_remove - Device Removal Routine
 * @pdev: PCI device information struct
 *
 * atl1e_remove is called by the PCI subsystem to alert the driver
 * that it should release a PCI device.  The could be caused by a
 * Hot-Plug event, or because the driver is going to be removed from
 * memory.
 */
static void atl1e_remove(struct pci_dev *pdev)
{
        struct net_device *netdev = pci_get_drvdata(pdev);
        struct atl1e_adapter *adapter = netdev_priv(netdev);

        /*
         * flush_scheduled work may reschedule our watchdog task, so
         * explicitly disable watchdog tasks from being rescheduled
         */
        set_bit(__AT_DOWN, &adapter->flags);

        atl1e_del_timer(adapter);
        atl1e_cancel_work(adapter);

        unregister_netdev(netdev);
        atl1e_free_ring_resources(adapter);
        atl1e_force_ps(&adapter->hw);
        pci_iounmap(pdev, adapter->hw.hw_addr);
        pci_release_regions(pdev);
        free_netdev(netdev);
        pci_disable_device(pdev);
}

/**
 * atl1e_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
atl1e_io_error_detected(struct pci_dev *pdev, pci_channel_state_t state)
{
        struct net_device *netdev = pci_get_drvdata(pdev);
        struct atl1e_adapter *adapter = netdev_priv(netdev);

        netif_device_detach(netdev);

        if (state == pci_channel_io_perm_failure)
                return PCI_ERS_RESULT_DISCONNECT;

        if (netif_running(netdev))
                atl1e_down(adapter);

        pci_disable_device(pdev);

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

/**
 * atl1e_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 atl1e_io_slot_reset(struct pci_dev *pdev)
{
        struct net_device *netdev = pci_get_drvdata(pdev);
        struct atl1e_adapter *adapter = netdev_priv(netdev);

        if (pci_enable_device(pdev)) {
                netdev_err(adapter->netdev,
                           "Cannot re-enable PCI device after reset\n");
                return PCI_ERS_RESULT_DISCONNECT;
        }
        pci_set_master(pdev);

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

        atl1e_reset_hw(&adapter->hw);

        return PCI_ERS_RESULT_RECOVERED;
}

/**
 * atl1e_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 atl1e_resume routine.
 */
static void atl1e_io_resume(struct pci_dev *pdev)
{
        struct net_device *netdev = pci_get_drvdata(pdev);
        struct atl1e_adapter *adapter = netdev_priv(netdev);

        if (netif_running(netdev)) {
                if (atl1e_up(adapter)) {
                        netdev_err(adapter->netdev,
                                   "can't bring device back up after reset\n");
                        return;
                }
        }

        netif_device_attach(netdev);
}

static const struct pci_error_handlers atl1e_err_handler = {
        .error_detected = atl1e_io_error_detected,
        .slot_reset = atl1e_io_slot_reset,
        .resume = atl1e_io_resume,
};

static struct pci_driver atl1e_driver = {
        .name     = atl1e_driver_name,
        .id_table = atl1e_pci_tbl,
        .probe    = atl1e_probe,
        .remove   = atl1e_remove,
        /* Power Management Hooks */
#ifdef CONFIG_PM
        .suspend  = atl1e_suspend,
        .resume   = atl1e_resume,
#endif
        .shutdown = atl1e_shutdown,
        .err_handler = &atl1e_err_handler
};

module_pci_driver(atl1e_driver);