Adding upstream version 6.6.15.upstream/6.6.15

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 2886 insertions, 0 deletions

diff --git a/drivers/net/ethernet/atheros/atl1c/atl1c_main.c b/drivers/net/ethernet/atheros/atl1c/atl1c_main.c
new file mode 100644
index 0000000000..74b78164cf
--- /dev/null
+++ b/drivers/net/ethernet/atheros/atl1c/atl1c_main.c
@@ -0,0 +1,2886 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Copyright(c) 2008 - 2009 Atheros Corporation. All rights reserved.
+ *
+ * Derived from Intel e1000 driver
+ * Copyright(c) 1999 - 2005 Intel Corporation. All rights reserved.
+ */
+
+#include "atl1c.h"
+
+char atl1c_driver_name[] = "atl1c";
+
+/*
+ * atl1c_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 atl1c_pci_tbl[] = {
+	{PCI_DEVICE(PCI_VENDOR_ID_ATTANSIC, PCI_DEVICE_ID_ATTANSIC_L1C)},
+	{PCI_DEVICE(PCI_VENDOR_ID_ATTANSIC, PCI_DEVICE_ID_ATTANSIC_L2C)},
+	{PCI_DEVICE(PCI_VENDOR_ID_ATTANSIC, PCI_DEVICE_ID_ATHEROS_L2C_B)},
+	{PCI_DEVICE(PCI_VENDOR_ID_ATTANSIC, PCI_DEVICE_ID_ATHEROS_L2C_B2)},
+	{PCI_DEVICE(PCI_VENDOR_ID_ATTANSIC, PCI_DEVICE_ID_ATHEROS_L1D)},
+	{PCI_DEVICE(PCI_VENDOR_ID_ATTANSIC, PCI_DEVICE_ID_ATHEROS_L1D_2_0)},
+	/* required last entry */
+	{ 0 }
+};
+MODULE_DEVICE_TABLE(pci, atl1c_pci_tbl);
+
+MODULE_AUTHOR("Jie Yang");
+MODULE_AUTHOR("Qualcomm Atheros Inc.");
+MODULE_DESCRIPTION("Qualcomm Atheros 100/1000M Ethernet Network Driver");
+MODULE_LICENSE("GPL");
+
+struct atl1c_qregs {
+	u16 tpd_addr_lo;
+	u16 tpd_prod;
+	u16 tpd_cons;
+	u16 rfd_addr_lo;
+	u16 rrd_addr_lo;
+	u16 rfd_prod;
+	u32 tx_isr;
+	u32 rx_isr;
+};
+
+static struct atl1c_qregs atl1c_qregs[AT_MAX_TRANSMIT_QUEUE] = {
+	{
+		REG_TPD_PRI0_ADDR_LO, REG_TPD_PRI0_PIDX, REG_TPD_PRI0_CIDX,
+		REG_RFD0_HEAD_ADDR_LO, REG_RRD0_HEAD_ADDR_LO,
+		REG_MB_RFD0_PROD_IDX, ISR_TX_PKT_0, ISR_RX_PKT_0
+	},
+	{
+		REG_TPD_PRI1_ADDR_LO, REG_TPD_PRI1_PIDX, REG_TPD_PRI1_CIDX,
+		REG_RFD1_HEAD_ADDR_LO, REG_RRD1_HEAD_ADDR_LO,
+		REG_MB_RFD1_PROD_IDX, ISR_TX_PKT_1, ISR_RX_PKT_1
+	},
+	{
+		REG_TPD_PRI2_ADDR_LO, REG_TPD_PRI2_PIDX, REG_TPD_PRI2_CIDX,
+		REG_RFD2_HEAD_ADDR_LO, REG_RRD2_HEAD_ADDR_LO,
+		REG_MB_RFD2_PROD_IDX, ISR_TX_PKT_2, ISR_RX_PKT_2
+	},
+	{
+		REG_TPD_PRI3_ADDR_LO, REG_TPD_PRI3_PIDX, REG_TPD_PRI3_CIDX,
+		REG_RFD3_HEAD_ADDR_LO, REG_RRD3_HEAD_ADDR_LO,
+		REG_MB_RFD3_PROD_IDX, ISR_TX_PKT_3, ISR_RX_PKT_3
+	},
+};
+
+static int atl1c_stop_mac(struct atl1c_hw *hw);
+static void atl1c_disable_l0s_l1(struct atl1c_hw *hw);
+static void atl1c_set_aspm(struct atl1c_hw *hw, u16 link_speed);
+static void atl1c_start_mac(struct atl1c_adapter *adapter);
+static int atl1c_up(struct atl1c_adapter *adapter);
+static void atl1c_down(struct atl1c_adapter *adapter);
+static int atl1c_reset_mac(struct atl1c_hw *hw);
+static void atl1c_reset_dma_ring(struct atl1c_adapter *adapter);
+static int atl1c_configure(struct atl1c_adapter *adapter);
+static int atl1c_alloc_rx_buffer(struct atl1c_adapter *adapter, u32 queue,
+				 bool napi_mode);
+
+
+static const u32 atl1c_default_msg = NETIF_MSG_DRV | NETIF_MSG_PROBE |
+	NETIF_MSG_LINK | NETIF_MSG_TIMER | NETIF_MSG_IFDOWN | NETIF_MSG_IFUP;
+static void atl1c_pcie_patch(struct atl1c_hw *hw)
+{
+	u32 mst_data, data;
+
+	/* pclk sel could switch to 25M */
+	AT_READ_REG(hw, REG_MASTER_CTRL, &mst_data);
+	mst_data &= ~MASTER_CTRL_CLK_SEL_DIS;
+	AT_WRITE_REG(hw, REG_MASTER_CTRL, mst_data);
+
+	/* WoL/PCIE related settings */
+	if (hw->nic_type == athr_l1c || hw->nic_type == athr_l2c) {
+		AT_READ_REG(hw, REG_PCIE_PHYMISC, &data);
+		data |= PCIE_PHYMISC_FORCE_RCV_DET;
+		AT_WRITE_REG(hw, REG_PCIE_PHYMISC, data);
+	} else { /* new dev set bit5 of MASTER */
+		if (!(mst_data & MASTER_CTRL_WAKEN_25M))
+			AT_WRITE_REG(hw, REG_MASTER_CTRL,
+				mst_data | MASTER_CTRL_WAKEN_25M);
+	}
+	/* aspm/PCIE setting only for l2cb 1.0 */
+	if (hw->nic_type == athr_l2c_b && hw->revision_id == L2CB_V10) {
+		AT_READ_REG(hw, REG_PCIE_PHYMISC2, &data);
+		data = FIELD_SETX(data, PCIE_PHYMISC2_CDR_BW,
+			L2CB1_PCIE_PHYMISC2_CDR_BW);
+		data = FIELD_SETX(data, PCIE_PHYMISC2_L0S_TH,
+			L2CB1_PCIE_PHYMISC2_L0S_TH);
+		AT_WRITE_REG(hw, REG_PCIE_PHYMISC2, data);
+		/* extend L1 sync timer */
+		AT_READ_REG(hw, REG_LINK_CTRL, &data);
+		data |= LINK_CTRL_EXT_SYNC;
+		AT_WRITE_REG(hw, REG_LINK_CTRL, data);
+	}
+	/* l2cb 1.x & l1d 1.x */
+	if (hw->nic_type == athr_l2c_b || hw->nic_type == athr_l1d) {
+		AT_READ_REG(hw, REG_PM_CTRL, &data);
+		data |= PM_CTRL_L0S_BUFSRX_EN;
+		AT_WRITE_REG(hw, REG_PM_CTRL, data);
+		/* clear vendor msg */
+		AT_READ_REG(hw, REG_DMA_DBG, &data);
+		AT_WRITE_REG(hw, REG_DMA_DBG, data & ~DMA_DBG_VENDOR_MSG);
+	}
+}
+
+/* FIXME: no need any more ? */
+/*
+ * atl1c_init_pcie - init PCIE module
+ */
+static void atl1c_reset_pcie(struct atl1c_hw *hw, u32 flag)
+{
+	u32 data;
+	u32 pci_cmd;
+	struct pci_dev *pdev = hw->adapter->pdev;
+	int pos;
+
+	AT_READ_REG(hw, PCI_COMMAND, &pci_cmd);
+	pci_cmd &= ~PCI_COMMAND_INTX_DISABLE;
+	pci_cmd |= (PCI_COMMAND_MEMORY | PCI_COMMAND_MASTER |
+		PCI_COMMAND_IO);
+	AT_WRITE_REG(hw, PCI_COMMAND, pci_cmd);
+
+	/*
+	 * Clear any PowerSaveing Settings
+	 */
+	pci_enable_wake(pdev, PCI_D3hot, 0);
+	pci_enable_wake(pdev, PCI_D3cold, 0);
+	/* wol sts read-clear */
+	AT_READ_REG(hw, REG_WOL_CTRL, &data);
+	AT_WRITE_REG(hw, REG_WOL_CTRL, 0);
+
+	/*
+	 * Mask some pcie error bits
+	 */
+	pos = pci_find_ext_capability(pdev, PCI_EXT_CAP_ID_ERR);
+	if (pos) {
+		pci_read_config_dword(pdev, pos + PCI_ERR_UNCOR_SEVER, &data);
+		data &= ~(PCI_ERR_UNC_DLP | PCI_ERR_UNC_FCP);
+		pci_write_config_dword(pdev, pos + PCI_ERR_UNCOR_SEVER, data);
+	}
+	/* clear error status */
+	pcie_capability_write_word(pdev, PCI_EXP_DEVSTA,
+			PCI_EXP_DEVSTA_NFED |
+			PCI_EXP_DEVSTA_FED |
+			PCI_EXP_DEVSTA_CED |
+			PCI_EXP_DEVSTA_URD);
+
+	AT_READ_REG(hw, REG_LTSSM_ID_CTRL, &data);
+	data &= ~LTSSM_ID_EN_WRO;
+	AT_WRITE_REG(hw, REG_LTSSM_ID_CTRL, data);
+
+	atl1c_pcie_patch(hw);
+	if (flag & ATL1C_PCIE_L0S_L1_DISABLE)
+		atl1c_disable_l0s_l1(hw);
+
+	msleep(5);
+}
+
+/**
+ * atl1c_irq_enable - Enable default interrupt generation settings
+ * @adapter: board private structure
+ */
+static inline void atl1c_irq_enable(struct atl1c_adapter *adapter)
+{
+	if (likely(atomic_dec_and_test(&adapter->irq_sem))) {
+		AT_WRITE_REG(&adapter->hw, REG_ISR, 0x7FFFFFFF);
+		AT_WRITE_REG(&adapter->hw, REG_IMR, adapter->hw.intr_mask);
+		AT_WRITE_FLUSH(&adapter->hw);
+	}
+}
+
+/**
+ * atl1c_irq_disable - Mask off interrupt generation on the NIC
+ * @adapter: board private structure
+ */
+static inline void atl1c_irq_disable(struct atl1c_adapter *adapter)
+{
+	atomic_inc(&adapter->irq_sem);
+	AT_WRITE_REG(&adapter->hw, REG_IMR, 0);
+	AT_WRITE_REG(&adapter->hw, REG_ISR, ISR_DIS_INT);
+	AT_WRITE_FLUSH(&adapter->hw);
+	synchronize_irq(adapter->pdev->irq);
+}
+
+/*
+ * atl1c_wait_until_idle - wait up to AT_HW_MAX_IDLE_DELAY reads
+ * of the idle status register until the device is actually idle
+ */
+static u32 atl1c_wait_until_idle(struct atl1c_hw *hw, u32 modu_ctrl)
+{
+	int timeout;
+	u32 data;
+
+	for (timeout = 0; timeout < AT_HW_MAX_IDLE_DELAY; timeout++) {
+		AT_READ_REG(hw, REG_IDLE_STATUS, &data);
+		if ((data & modu_ctrl) == 0)
+			return 0;
+		msleep(1);
+	}
+	return data;
+}
+
+/**
+ * atl1c_phy_config - Timer Call-back
+ * @t: timer list containing pointer to netdev cast into an unsigned long
+ */
+static void atl1c_phy_config(struct timer_list *t)
+{
+	struct atl1c_adapter *adapter = from_timer(adapter, t,
+						   phy_config_timer);
+	struct atl1c_hw *hw = &adapter->hw;
+	unsigned long flags;
+
+	spin_lock_irqsave(&adapter->mdio_lock, flags);
+	atl1c_restart_autoneg(hw);
+	spin_unlock_irqrestore(&adapter->mdio_lock, flags);
+}
+
+void atl1c_reinit_locked(struct atl1c_adapter *adapter)
+{
+	atl1c_down(adapter);
+	atl1c_up(adapter);
+	clear_bit(__AT_RESETTING, &adapter->flags);
+}
+
+static void atl1c_check_link_status(struct atl1c_adapter *adapter)
+{
+	struct atl1c_hw *hw = &adapter->hw;
+	struct net_device *netdev = adapter->netdev;
+	struct pci_dev    *pdev   = adapter->pdev;
+	int err;
+	unsigned long flags;
+	u16 speed, duplex;
+	bool link;
+
+	spin_lock_irqsave(&adapter->mdio_lock, flags);
+	link = atl1c_get_link_status(hw);
+	spin_unlock_irqrestore(&adapter->mdio_lock, flags);
+
+	if (!link) {
+		/* link down */
+		netif_carrier_off(netdev);
+		hw->hibernate = true;
+		if (atl1c_reset_mac(hw) != 0)
+			if (netif_msg_hw(adapter))
+				dev_warn(&pdev->dev, "reset mac failed\n");
+		atl1c_set_aspm(hw, SPEED_0);
+		atl1c_post_phy_linkchg(hw, SPEED_0);
+		atl1c_reset_dma_ring(adapter);
+		atl1c_configure(adapter);
+	} else {
+		/* Link Up */
+		hw->hibernate = false;
+		spin_lock_irqsave(&adapter->mdio_lock, flags);
+		err = atl1c_get_speed_and_duplex(hw, &speed, &duplex);
+		spin_unlock_irqrestore(&adapter->mdio_lock, flags);
+		if (unlikely(err))
+			return;
+		/* link result is our setting */
+		if (adapter->link_speed != speed ||
+		    adapter->link_duplex != duplex) {
+			adapter->link_speed  = speed;
+			adapter->link_duplex = duplex;
+			atl1c_set_aspm(hw, speed);
+			atl1c_post_phy_linkchg(hw, speed);
+			atl1c_start_mac(adapter);
+			if (netif_msg_link(adapter))
+				dev_info(&pdev->dev,
+					"%s: %s NIC Link is Up<%d Mbps %s>\n",
+					atl1c_driver_name, netdev->name,
+					adapter->link_speed,
+					adapter->link_duplex == FULL_DUPLEX ?
+					"Full Duplex" : "Half Duplex");
+		}
+		if (!netif_carrier_ok(netdev))
+			netif_carrier_on(netdev);
+	}
+}
+
+static void atl1c_link_chg_event(struct atl1c_adapter *adapter)
+{
+	struct net_device *netdev = adapter->netdev;
+	struct pci_dev    *pdev   = adapter->pdev;
+	bool link;
+
+	spin_lock(&adapter->mdio_lock);
+	link = atl1c_get_link_status(&adapter->hw);
+	spin_unlock(&adapter->mdio_lock);
+	/* notify upper layer link down ASAP */
+	if (!link) {
+		if (netif_carrier_ok(netdev)) {
+			/* old link state: Up */
+			netif_carrier_off(netdev);
+			if (netif_msg_link(adapter))
+				dev_info(&pdev->dev,
+					"%s: %s NIC Link is Down\n",
+					atl1c_driver_name, netdev->name);
+			adapter->link_speed = SPEED_0;
+		}
+	}
+
+	set_bit(ATL1C_WORK_EVENT_LINK_CHANGE, &adapter->work_event);
+	schedule_work(&adapter->common_task);
+}
+
+static void atl1c_common_task(struct work_struct *work)
+{
+	struct atl1c_adapter *adapter;
+	struct net_device *netdev;
+
+	adapter = container_of(work, struct atl1c_adapter, common_task);
+	netdev = adapter->netdev;
+
+	if (test_bit(__AT_DOWN, &adapter->flags))
+		return;
+
+	if (test_and_clear_bit(ATL1C_WORK_EVENT_RESET, &adapter->work_event)) {
+		netif_device_detach(netdev);
+		atl1c_down(adapter);
+		atl1c_up(adapter);
+		netif_device_attach(netdev);
+	}
+
+	if (test_and_clear_bit(ATL1C_WORK_EVENT_LINK_CHANGE,
+		&adapter->work_event)) {
+		atl1c_irq_disable(adapter);
+		atl1c_check_link_status(adapter);
+		atl1c_irq_enable(adapter);
+	}
+}
+
+
+static void atl1c_del_timer(struct atl1c_adapter *adapter)
+{
+	del_timer_sync(&adapter->phy_config_timer);
+}
+
+
+/**
+ * atl1c_tx_timeout - Respond to a Tx Hang
+ * @netdev: network interface device structure
+ * @txqueue: index of hanging tx queue
+ */
+static void atl1c_tx_timeout(struct net_device *netdev, unsigned int txqueue)
+{
+	struct atl1c_adapter *adapter = netdev_priv(netdev);
+
+	/* Do the reset outside of interrupt context */
+	set_bit(ATL1C_WORK_EVENT_RESET, &adapter->work_event);
+	schedule_work(&adapter->common_task);
+}
+
+/**
+ * atl1c_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 atl1c_set_multi(struct net_device *netdev)
+{
+	struct atl1c_adapter *adapter = netdev_priv(netdev);
+	struct atl1c_hw *hw = &adapter->hw;
+	struct netdev_hw_addr *ha;
+	u32 mac_ctrl_data;
+	u32 hash_value;
+
+	/* Check for Promiscuous and All Multicast modes */
+	AT_READ_REG(hw, REG_MAC_CTRL, &mac_ctrl_data);
+
+	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 = atl1c_hash_mc_addr(hw, ha->addr);
+		atl1c_hash_set(hw, hash_value);
+	}
+}
+
+static void __atl1c_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 atl1c_vlan_mode(struct net_device *netdev,
+	netdev_features_t features)
+{
+	struct atl1c_adapter *adapter = netdev_priv(netdev);
+	struct pci_dev *pdev = adapter->pdev;
+	u32 mac_ctrl_data = 0;
+
+	if (netif_msg_pktdata(adapter))
+		dev_dbg(&pdev->dev, "atl1c_vlan_mode\n");
+
+	atl1c_irq_disable(adapter);
+	AT_READ_REG(&adapter->hw, REG_MAC_CTRL, &mac_ctrl_data);
+	__atl1c_vlan_mode(features, &mac_ctrl_data);
+	AT_WRITE_REG(&adapter->hw, REG_MAC_CTRL, mac_ctrl_data);
+	atl1c_irq_enable(adapter);
+}
+
+static void atl1c_restore_vlan(struct atl1c_adapter *adapter)
+{
+	struct pci_dev *pdev = adapter->pdev;
+
+	if (netif_msg_pktdata(adapter))
+		dev_dbg(&pdev->dev, "atl1c_restore_vlan\n");
+	atl1c_vlan_mode(adapter->netdev, adapter->netdev->features);
+}
+
+/**
+ * atl1c_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 atl1c_set_mac_addr(struct net_device *netdev, void *p)
+{
+	struct atl1c_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;
+
+	eth_hw_addr_set(netdev, addr->sa_data);
+	memcpy(adapter->hw.mac_addr, addr->sa_data, netdev->addr_len);
+
+	atl1c_hw_set_mac_addr(&adapter->hw, adapter->hw.mac_addr);
+
+	return 0;
+}
+
+static void atl1c_set_rxbufsize(struct atl1c_adapter *adapter,
+				struct net_device *dev)
+{
+	int mtu = dev->mtu;
+
+	adapter->rx_buffer_len = mtu > AT_RX_BUF_SIZE ?
+		roundup(mtu + ETH_HLEN + ETH_FCS_LEN + VLAN_HLEN, 8) : AT_RX_BUF_SIZE;
+}
+
+static netdev_features_t atl1c_fix_features(struct net_device *netdev,
+	netdev_features_t features)
+{
+	struct atl1c_adapter *adapter = netdev_priv(netdev);
+	struct atl1c_hw *hw = &adapter->hw;
+
+	/*
+	 * 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;
+
+	if (hw->nic_type != athr_mt) {
+		if (netdev->mtu > MAX_TSO_FRAME_SIZE)
+			features &= ~(NETIF_F_TSO | NETIF_F_TSO6);
+	}
+
+	return features;
+}
+
+static int atl1c_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)
+		atl1c_vlan_mode(netdev, features);
+
+	return 0;
+}
+
+static void atl1c_set_max_mtu(struct net_device *netdev)
+{
+	struct atl1c_adapter *adapter = netdev_priv(netdev);
+	struct atl1c_hw *hw = &adapter->hw;
+
+	switch (hw->nic_type) {
+	/* These (GbE) devices support jumbo packets, max_mtu 6122 */
+	case athr_l1c:
+	case athr_l1d:
+	case athr_l1d_2:
+		netdev->max_mtu = MAX_JUMBO_FRAME_SIZE -
+			(ETH_HLEN + ETH_FCS_LEN + VLAN_HLEN);
+		break;
+	case athr_mt:
+		netdev->max_mtu = 9500;
+		break;
+		/* The 10/100 devices don't support jumbo packets, max_mtu 1500 */
+	default:
+		netdev->max_mtu = ETH_DATA_LEN;
+		break;
+	}
+}
+
+/**
+ * atl1c_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 atl1c_change_mtu(struct net_device *netdev, int new_mtu)
+{
+	struct atl1c_adapter *adapter = netdev_priv(netdev);
+
+	/* 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;
+		atl1c_set_rxbufsize(adapter, netdev);
+		atl1c_down(adapter);
+		netdev_update_features(netdev);
+		atl1c_up(adapter);
+		clear_bit(__AT_RESETTING, &adapter->flags);
+	}
+	return 0;
+}
+
+/*
+ *  caller should hold mdio_lock
+ */
+static int atl1c_mdio_read(struct net_device *netdev, int phy_id, int reg_num)
+{
+	struct atl1c_adapter *adapter = netdev_priv(netdev);
+	u16 result;
+
+	atl1c_read_phy_reg(&adapter->hw, reg_num, &result);
+	return result;
+}
+
+static void atl1c_mdio_write(struct net_device *netdev, int phy_id,
+			     int reg_num, int val)
+{
+	struct atl1c_adapter *adapter = netdev_priv(netdev);
+
+	atl1c_write_phy_reg(&adapter->hw, reg_num, val);
+}
+
+static int atl1c_mii_ioctl(struct net_device *netdev,
+			   struct ifreq *ifr, int cmd)
+{
+	struct atl1c_adapter *adapter = netdev_priv(netdev);
+	struct pci_dev *pdev = adapter->pdev;
+	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 (atl1c_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;
+		}
+
+		dev_dbg(&pdev->dev, "<atl1c_mii_ioctl> write %x %x",
+				data->reg_num, data->val_in);
+		if (atl1c_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 atl1c_ioctl(struct net_device *netdev, struct ifreq *ifr, int cmd)
+{
+	switch (cmd) {
+	case SIOCGMIIPHY:
+	case SIOCGMIIREG:
+	case SIOCSMIIREG:
+		return atl1c_mii_ioctl(netdev, ifr, cmd);
+	default:
+		return -EOPNOTSUPP;
+	}
+}
+
+/**
+ * atl1c_alloc_queues - Allocate memory for all rings
+ * @adapter: board private structure to initialize
+ *
+ */
+static int atl1c_alloc_queues(struct atl1c_adapter *adapter)
+{
+	return 0;
+}
+
+static enum atl1c_nic_type atl1c_get_mac_type(struct pci_dev *pdev,
+					      u8 __iomem *hw_addr)
+{
+	switch (pdev->device) {
+	case PCI_DEVICE_ID_ATTANSIC_L2C:
+		return athr_l2c;
+	case PCI_DEVICE_ID_ATTANSIC_L1C:
+		return athr_l1c;
+	case PCI_DEVICE_ID_ATHEROS_L2C_B:
+		return athr_l2c_b;
+	case PCI_DEVICE_ID_ATHEROS_L2C_B2:
+		return athr_l2c_b2;
+	case PCI_DEVICE_ID_ATHEROS_L1D:
+		return athr_l1d;
+	case PCI_DEVICE_ID_ATHEROS_L1D_2_0:
+		if (readl(hw_addr + REG_MT_MAGIC) == MT_MAGIC)
+			return athr_mt;
+		return athr_l1d_2;
+	default:
+		return athr_l1c;
+	}
+}
+
+static int atl1c_setup_mac_funcs(struct atl1c_hw *hw)
+{
+	u32 link_ctrl_data;
+
+	AT_READ_REG(hw, REG_LINK_CTRL, &link_ctrl_data);
+
+	hw->ctrl_flags = ATL1C_INTR_MODRT_ENABLE  |
+			 ATL1C_TXQ_MODE_ENHANCE;
+	hw->ctrl_flags |= ATL1C_ASPM_L0S_SUPPORT |
+			  ATL1C_ASPM_L1_SUPPORT;
+	hw->ctrl_flags |= ATL1C_ASPM_CTRL_MON;
+
+	if (hw->nic_type == athr_l1c ||
+	    hw->nic_type == athr_l1d ||
+	    hw->nic_type == athr_l1d_2)
+		hw->link_cap_flags |= ATL1C_LINK_CAP_1000M;
+	return 0;
+}
+
+struct atl1c_platform_patch {
+	u16 pci_did;
+	u8  pci_revid;
+	u16 subsystem_vid;
+	u16 subsystem_did;
+	u32 patch_flag;
+#define ATL1C_LINK_PATCH	0x1
+};
+static const struct atl1c_platform_patch plats[] = {
+{0x2060, 0xC1, 0x1019, 0x8152, 0x1},
+{0x2060, 0xC1, 0x1019, 0x2060, 0x1},
+{0x2060, 0xC1, 0x1019, 0xE000, 0x1},
+{0x2062, 0xC0, 0x1019, 0x8152, 0x1},
+{0x2062, 0xC0, 0x1019, 0x2062, 0x1},
+{0x2062, 0xC0, 0x1458, 0xE000, 0x1},
+{0x2062, 0xC1, 0x1019, 0x8152, 0x1},
+{0x2062, 0xC1, 0x1019, 0x2062, 0x1},
+{0x2062, 0xC1, 0x1458, 0xE000, 0x1},
+{0x2062, 0xC1, 0x1565, 0x2802, 0x1},
+{0x2062, 0xC1, 0x1565, 0x2801, 0x1},
+{0x1073, 0xC0, 0x1019, 0x8151, 0x1},
+{0x1073, 0xC0, 0x1019, 0x1073, 0x1},
+{0x1073, 0xC0, 0x1458, 0xE000, 0x1},
+{0x1083, 0xC0, 0x1458, 0xE000, 0x1},
+{0x1083, 0xC0, 0x1019, 0x8151, 0x1},
+{0x1083, 0xC0, 0x1019, 0x1083, 0x1},
+{0x1083, 0xC0, 0x1462, 0x7680, 0x1},
+{0x1083, 0xC0, 0x1565, 0x2803, 0x1},
+{0},
+};
+
+static void atl1c_patch_assign(struct atl1c_hw *hw)
+{
+	struct pci_dev	*pdev = hw->adapter->pdev;
+	u32 misc_ctrl;
+	int i = 0;
+
+	hw->msi_lnkpatch = false;
+
+	while (plats[i].pci_did != 0) {
+		if (plats[i].pci_did == hw->device_id &&
+		    plats[i].pci_revid == hw->revision_id &&
+		    plats[i].subsystem_vid == hw->subsystem_vendor_id &&
+		    plats[i].subsystem_did == hw->subsystem_id) {
+			if (plats[i].patch_flag & ATL1C_LINK_PATCH)
+				hw->msi_lnkpatch = true;
+		}
+		i++;
+	}
+
+	if (hw->device_id == PCI_DEVICE_ID_ATHEROS_L2C_B2 &&
+	    hw->revision_id == L2CB_V21) {
+		/* config access mode */
+		pci_write_config_dword(pdev, REG_PCIE_IND_ACC_ADDR,
+				       REG_PCIE_DEV_MISC_CTRL);
+		pci_read_config_dword(pdev, REG_PCIE_IND_ACC_DATA, &misc_ctrl);
+		misc_ctrl &= ~0x100;
+		pci_write_config_dword(pdev, REG_PCIE_IND_ACC_ADDR,
+				       REG_PCIE_DEV_MISC_CTRL);
+		pci_write_config_dword(pdev, REG_PCIE_IND_ACC_DATA, misc_ctrl);
+	}
+}
+/**
+ * atl1c_sw_init - Initialize general software structures (struct atl1c_adapter)
+ * @adapter: board private structure to initialize
+ *
+ * atl1c_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 atl1c_sw_init(struct atl1c_adapter *adapter)
+{
+	struct atl1c_hw *hw   = &adapter->hw;
+	struct pci_dev	*pdev = adapter->pdev;
+	u32 revision;
+	int i;
+
+	adapter->wol = 0;
+	device_set_wakeup_enable(&pdev->dev, false);
+	adapter->link_speed = SPEED_0;
+	adapter->link_duplex = FULL_DUPLEX;
+	adapter->tpd_ring[0].count = 1024;
+	adapter->rfd_ring[0].count = 512;
+
+	hw->vendor_id = pdev->vendor;
+	hw->device_id = pdev->device;
+	hw->subsystem_vendor_id = pdev->subsystem_vendor;
+	hw->subsystem_id = pdev->subsystem_device;
+	pci_read_config_dword(pdev, PCI_CLASS_REVISION, &revision);
+	hw->revision_id = revision & 0xFF;
+	/* before link up, we assume hibernate is true */
+	hw->hibernate = true;
+	hw->media_type = MEDIA_TYPE_AUTO_SENSOR;
+	if (atl1c_setup_mac_funcs(hw) != 0) {
+		dev_err(&pdev->dev, "set mac function pointers failed\n");
+		return -1;
+	}
+	atl1c_patch_assign(hw);
+
+	hw->intr_mask = IMR_NORMAL_MASK;
+	for (i = 0; i < adapter->tx_queue_count; ++i)
+		hw->intr_mask |= atl1c_qregs[i].tx_isr;
+	for (i = 0; i < adapter->rx_queue_count; ++i)
+		hw->intr_mask |= atl1c_qregs[i].rx_isr;
+	hw->phy_configured = false;
+	hw->preamble_len = 7;
+	hw->max_frame_size = adapter->netdev->mtu;
+	hw->autoneg_advertised = ADVERTISED_Autoneg;
+	hw->indirect_tab = 0xE4E4E4E4;
+	hw->base_cpu = 0;
+
+	hw->ict = 50000;		/* 100ms */
+	hw->smb_timer = 200000;	  	/* 400ms */
+	hw->rx_imt = 200;
+	hw->tx_imt = 1000;
+
+	hw->tpd_burst = 5;
+	hw->rfd_burst = 8;
+	hw->dma_order = atl1c_dma_ord_out;
+	hw->dmar_block = atl1c_dma_req_1024;
+
+	if (atl1c_alloc_queues(adapter)) {
+		dev_err(&pdev->dev, "Unable to allocate memory for queues\n");
+		return -ENOMEM;
+	}
+	/* TODO */
+	atl1c_set_rxbufsize(adapter, adapter->netdev);
+	atomic_set(&adapter->irq_sem, 1);
+	spin_lock_init(&adapter->mdio_lock);
+	spin_lock_init(&adapter->hw.intr_mask_lock);
+	set_bit(__AT_DOWN, &adapter->flags);
+
+	return 0;
+}
+
+static inline void atl1c_clean_buffer(struct pci_dev *pdev,
+				struct atl1c_buffer *buffer_info)
+{
+	u16 pci_driection;
+	if (buffer_info->flags & ATL1C_BUFFER_FREE)
+		return;
+	if (buffer_info->dma) {
+		if (buffer_info->flags & ATL1C_PCIMAP_FROMDEVICE)
+			pci_driection = DMA_FROM_DEVICE;
+		else
+			pci_driection = DMA_TO_DEVICE;
+
+		if (buffer_info->flags & ATL1C_PCIMAP_SINGLE)
+			dma_unmap_single(&pdev->dev, buffer_info->dma,
+					 buffer_info->length, pci_driection);
+		else if (buffer_info->flags & ATL1C_PCIMAP_PAGE)
+			dma_unmap_page(&pdev->dev, buffer_info->dma,
+				       buffer_info->length, pci_driection);
+	}
+	if (buffer_info->skb)
+		dev_consume_skb_any(buffer_info->skb);
+	buffer_info->dma = 0;
+	buffer_info->skb = NULL;
+	ATL1C_SET_BUFFER_STATE(buffer_info, ATL1C_BUFFER_FREE);
+}
+/**
+ * atl1c_clean_tx_ring - Free Tx-skb
+ * @adapter: board private structure
+ * @queue: idx of transmit queue
+ */
+static void atl1c_clean_tx_ring(struct atl1c_adapter *adapter,
+				u32 queue)
+{
+	struct atl1c_tpd_ring *tpd_ring = &adapter->tpd_ring[queue];
+	struct atl1c_buffer *buffer_info;
+	struct pci_dev *pdev = adapter->pdev;
+	u16 index, ring_count;
+
+	ring_count = tpd_ring->count;
+	for (index = 0; index < ring_count; index++) {
+		buffer_info = &tpd_ring->buffer_info[index];
+		atl1c_clean_buffer(pdev, buffer_info);
+	}
+
+	netdev_tx_reset_queue(netdev_get_tx_queue(adapter->netdev, queue));
+
+	/* Zero out Tx-buffers */
+	memset(tpd_ring->desc, 0, sizeof(struct atl1c_tpd_desc) *
+		ring_count);
+	atomic_set(&tpd_ring->next_to_clean, 0);
+	tpd_ring->next_to_use = 0;
+}
+
+/**
+ * atl1c_clean_rx_ring - Free rx-reservation skbs
+ * @adapter: board private structure
+ * @queue: idx of transmit queue
+ */
+static void atl1c_clean_rx_ring(struct atl1c_adapter *adapter, u32 queue)
+{
+	struct atl1c_rfd_ring *rfd_ring = &adapter->rfd_ring[queue];
+	struct atl1c_rrd_ring *rrd_ring = &adapter->rrd_ring[queue];
+	struct atl1c_buffer *buffer_info;
+	struct pci_dev *pdev = adapter->pdev;
+	int j;
+
+	for (j = 0; j < rfd_ring->count; j++) {
+		buffer_info = &rfd_ring->buffer_info[j];
+		atl1c_clean_buffer(pdev, buffer_info);
+	}
+	/* zero out the descriptor ring */
+	memset(rfd_ring->desc, 0, rfd_ring->size);
+	rfd_ring->next_to_clean = 0;
+	rfd_ring->next_to_use = 0;
+	rrd_ring->next_to_use = 0;
+	rrd_ring->next_to_clean = 0;
+}
+
+/*
+ * Read / Write Ptr Initialize:
+ */
+static void atl1c_init_ring_ptrs(struct atl1c_adapter *adapter)
+{
+	struct atl1c_tpd_ring *tpd_ring = adapter->tpd_ring;
+	struct atl1c_rfd_ring *rfd_ring = adapter->rfd_ring;
+	struct atl1c_rrd_ring *rrd_ring = adapter->rrd_ring;
+	struct atl1c_buffer *buffer_info;
+	int i, j;
+
+	for (i = 0; i < adapter->tx_queue_count; i++) {
+		tpd_ring[i].next_to_use = 0;
+		atomic_set(&tpd_ring[i].next_to_clean, 0);
+		buffer_info = tpd_ring[i].buffer_info;
+		for (j = 0; j < tpd_ring->count; j++)
+			ATL1C_SET_BUFFER_STATE(&buffer_info[i],
+					       ATL1C_BUFFER_FREE);
+	}
+	for (i = 0; i < adapter->rx_queue_count; i++) {
+		rfd_ring[i].next_to_use = 0;
+		rfd_ring[i].next_to_clean = 0;
+		rrd_ring[i].next_to_use = 0;
+		rrd_ring[i].next_to_clean = 0;
+		for (j = 0; j < rfd_ring[i].count; j++) {
+			buffer_info = &rfd_ring[i].buffer_info[j];
+			ATL1C_SET_BUFFER_STATE(buffer_info, ATL1C_BUFFER_FREE);
+		}
+	}
+}
+
+/**
+ * atl1c_free_ring_resources - Free Tx / RX descriptor Resources
+ * @adapter: board private structure
+ *
+ * Free all transmit software resources
+ */
+static void atl1c_free_ring_resources(struct atl1c_adapter *adapter)
+{
+	struct pci_dev *pdev = adapter->pdev;
+
+	dma_free_coherent(&pdev->dev, adapter->ring_header.size,
+			  adapter->ring_header.desc, adapter->ring_header.dma);
+	adapter->ring_header.desc = NULL;
+
+	/* Note: just free tdp_ring.buffer_info,
+	 * it contain rfd_ring.buffer_info, do not double free
+	 */
+	if (adapter->tpd_ring[0].buffer_info) {
+		kfree(adapter->tpd_ring[0].buffer_info);
+		adapter->tpd_ring[0].buffer_info = NULL;
+	}
+}
+
+/**
+ * atl1c_setup_ring_resources - allocate Tx / RX descriptor resources
+ * @adapter: board private structure
+ *
+ * Return 0 on success, negative on failure
+ */
+static int atl1c_setup_ring_resources(struct atl1c_adapter *adapter)
+{
+	struct pci_dev *pdev = adapter->pdev;
+	struct atl1c_tpd_ring *tpd_ring = adapter->tpd_ring;
+	struct atl1c_rfd_ring *rfd_ring = adapter->rfd_ring;
+	struct atl1c_rrd_ring *rrd_ring = adapter->rrd_ring;
+	struct atl1c_ring_header *ring_header = &adapter->ring_header;
+	int tqc = adapter->tx_queue_count;
+	int rqc = adapter->rx_queue_count;
+	int size;
+	int i;
+	int count = 0;
+	u32 offset = 0;
+
+	/* Even though only one tpd queue is actually used, the "high"
+	 * priority tpd queue also gets initialized
+	 */
+	if (tqc == 1)
+		tqc = 2;
+
+	for (i = 1; i < tqc; i++)
+		tpd_ring[i].count = tpd_ring[0].count;
+
+	size = sizeof(struct atl1c_buffer) * (tpd_ring->count * tqc +
+					      rfd_ring->count * rqc);
+	tpd_ring->buffer_info = kzalloc(size, GFP_KERNEL);
+	if (unlikely(!tpd_ring->buffer_info))
+		goto err_nomem;
+
+	for (i = 0; i < tqc; i++) {
+		tpd_ring[i].adapter = adapter;
+		tpd_ring[i].num = i;
+		tpd_ring[i].buffer_info = (tpd_ring->buffer_info + count);
+		count += tpd_ring[i].count;
+	}
+
+	for (i = 0; i < rqc; i++) {
+		rrd_ring[i].adapter = adapter;
+		rrd_ring[i].num = i;
+		rrd_ring[i].count = rfd_ring[0].count;
+		rfd_ring[i].count = rfd_ring[0].count;
+		rfd_ring[i].buffer_info = (tpd_ring->buffer_info + count);
+		count += rfd_ring->count;
+	}
+
+	/*
+	 * real ring DMA buffer
+	 * each ring/block may need up to 8 bytes for alignment, hence the
+	 * additional bytes tacked onto the end.
+	 */
+	ring_header->size =
+		sizeof(struct atl1c_tpd_desc) * tpd_ring->count * tqc +
+		sizeof(struct atl1c_rx_free_desc) * rfd_ring->count * rqc +
+		sizeof(struct atl1c_recv_ret_status) * rfd_ring->count * rqc +
+		8 * 4;
+
+	ring_header->desc = dma_alloc_coherent(&pdev->dev, ring_header->size,
+					       &ring_header->dma, GFP_KERNEL);
+	if (unlikely(!ring_header->desc)) {
+		dev_err(&pdev->dev, "could not get memory for DMA buffer\n");
+		goto err_nomem;
+	}
+	/* init TPD ring */
+
+	tpd_ring[0].dma = roundup(ring_header->dma, 8);
+	offset = tpd_ring[0].dma - ring_header->dma;
+	for (i = 0; i < tqc; i++) {
+		tpd_ring[i].dma = ring_header->dma + offset;
+		tpd_ring[i].desc = (u8 *)ring_header->desc + offset;
+		tpd_ring[i].size =
+			sizeof(struct atl1c_tpd_desc) * tpd_ring[i].count;
+		offset += roundup(tpd_ring[i].size, 8);
+	}
+	for (i = 0; i < rqc; i++) {
+		/* init RFD ring */
+		rfd_ring[i].dma = ring_header->dma + offset;
+		rfd_ring[i].desc = (u8 *)ring_header->desc + offset;
+		rfd_ring[i].size = sizeof(struct atl1c_rx_free_desc) *
+			rfd_ring[i].count;
+		offset += roundup(rfd_ring[i].size, 8);
+
+		/* init RRD ring */
+		rrd_ring[i].dma = ring_header->dma + offset;
+		rrd_ring[i].desc = (u8 *)ring_header->desc + offset;
+		rrd_ring[i].size = sizeof(struct atl1c_recv_ret_status) *
+			rrd_ring[i].count;
+		offset += roundup(rrd_ring[i].size, 8);
+	}
+
+	return 0;
+
+err_nomem:
+	kfree(tpd_ring->buffer_info);
+	return -ENOMEM;
+}
+
+static void atl1c_configure_des_ring(struct atl1c_adapter *adapter)
+{
+	struct atl1c_hw *hw = &adapter->hw;
+	struct atl1c_rfd_ring *rfd_ring = adapter->rfd_ring;
+	struct atl1c_rrd_ring *rrd_ring = adapter->rrd_ring;
+	struct atl1c_tpd_ring *tpd_ring = adapter->tpd_ring;
+	int i;
+	int tx_queue_count = adapter->tx_queue_count;
+
+	if (tx_queue_count == 1)
+		tx_queue_count = 2;
+
+	/* TPD */
+	AT_WRITE_REG(hw, REG_TX_BASE_ADDR_HI,
+		     (u32)((tpd_ring[0].dma & AT_DMA_HI_ADDR_MASK) >> 32));
+	/* just enable normal priority TX queue */
+	for (i = 0; i < tx_queue_count; i++) {
+		AT_WRITE_REG(hw, atl1c_qregs[i].tpd_addr_lo,
+			     (u32)(tpd_ring[i].dma & AT_DMA_LO_ADDR_MASK));
+	}
+	AT_WRITE_REG(hw, REG_TPD_RING_SIZE,
+			(u32)(tpd_ring[0].count & TPD_RING_SIZE_MASK));
+
+
+	/* RFD */
+	AT_WRITE_REG(hw, REG_RX_BASE_ADDR_HI,
+		     (u32)((rfd_ring->dma & AT_DMA_HI_ADDR_MASK) >> 32));
+	for (i = 0; i < adapter->rx_queue_count; i++) {
+		AT_WRITE_REG(hw, atl1c_qregs[i].rfd_addr_lo,
+			     (u32)(rfd_ring[i].dma & AT_DMA_LO_ADDR_MASK));
+	}
+
+	AT_WRITE_REG(hw, REG_RFD_RING_SIZE,
+			rfd_ring->count & RFD_RING_SIZE_MASK);
+	AT_WRITE_REG(hw, REG_RX_BUF_SIZE,
+			adapter->rx_buffer_len & RX_BUF_SIZE_MASK);
+
+	/* RRD */
+	for (i = 0; i < adapter->rx_queue_count; i++) {
+		AT_WRITE_REG(hw, atl1c_qregs[i].rrd_addr_lo,
+			     (u32)(rrd_ring[i].dma & AT_DMA_LO_ADDR_MASK));
+	}
+	AT_WRITE_REG(hw, REG_RRD_RING_SIZE,
+			(rrd_ring->count & RRD_RING_SIZE_MASK));
+
+	if (hw->nic_type == athr_l2c_b) {
+		AT_WRITE_REG(hw, REG_SRAM_RXF_LEN, 0x02a0L);
+		AT_WRITE_REG(hw, REG_SRAM_TXF_LEN, 0x0100L);
+		AT_WRITE_REG(hw, REG_SRAM_RXF_ADDR, 0x029f0000L);
+		AT_WRITE_REG(hw, REG_SRAM_RFD0_INFO, 0x02bf02a0L);
+		AT_WRITE_REG(hw, REG_SRAM_TXF_ADDR, 0x03bf02c0L);
+		AT_WRITE_REG(hw, REG_SRAM_TRD_ADDR, 0x03df03c0L);
+		AT_WRITE_REG(hw, REG_TXF_WATER_MARK, 0);	/* TX watermark, to enter l1 state.*/
+		AT_WRITE_REG(hw, REG_RXD_DMA_CTRL, 0);		/* RXD threshold.*/
+	}
+	/* Load all of base address above */
+	AT_WRITE_REG(hw, REG_LOAD_PTR, 1);
+}
+
+static void atl1c_configure_tx(struct atl1c_adapter *adapter)
+{
+	struct atl1c_hw *hw = &adapter->hw;
+	int max_pay_load;
+	u16 tx_offload_thresh;
+	u32 txq_ctrl_data;
+
+	tx_offload_thresh = MAX_TSO_FRAME_SIZE;
+	AT_WRITE_REG(hw, REG_TX_TSO_OFFLOAD_THRESH,
+		(tx_offload_thresh >> 3) & TX_TSO_OFFLOAD_THRESH_MASK);
+	max_pay_load = pcie_get_readrq(adapter->pdev) >> 8;
+	hw->dmar_block = min_t(u32, max_pay_load, hw->dmar_block);
+	/*
+	 * if BIOS had changed the dam-read-max-length to an invalid value,
+	 * restore it to default value
+	 */
+	if (hw->dmar_block < DEVICE_CTRL_MAXRRS_MIN) {
+		pcie_set_readrq(adapter->pdev, 128 << DEVICE_CTRL_MAXRRS_MIN);
+		hw->dmar_block = DEVICE_CTRL_MAXRRS_MIN;
+	}
+	txq_ctrl_data =
+		hw->nic_type == athr_l2c_b || hw->nic_type == athr_l2c_b2 ?
+		L2CB_TXQ_CFGV : L1C_TXQ_CFGV;
+
+	AT_WRITE_REG(hw, REG_TXQ_CTRL, txq_ctrl_data);
+}
+
+static void atl1c_configure_rx(struct atl1c_adapter *adapter)
+{
+	struct atl1c_hw *hw = &adapter->hw;
+	u32 rxq_ctrl_data;
+
+	rxq_ctrl_data = (hw->rfd_burst & RXQ_RFD_BURST_NUM_MASK) <<
+			RXQ_RFD_BURST_NUM_SHIFT;
+
+	if (hw->ctrl_flags & ATL1C_RX_IPV6_CHKSUM)
+		rxq_ctrl_data |= IPV6_CHKSUM_CTRL_EN;
+
+	/* aspm for gigabit */
+	if (hw->nic_type != athr_l1d_2 && (hw->device_id & 1) != 0)
+		rxq_ctrl_data = FIELD_SETX(rxq_ctrl_data, ASPM_THRUPUT_LIMIT,
+			ASPM_THRUPUT_LIMIT_100M);
+
+	AT_WRITE_REG(hw, REG_RXQ_CTRL, rxq_ctrl_data);
+}
+
+static void atl1c_configure_dma(struct atl1c_adapter *adapter)
+{
+	struct atl1c_hw *hw = &adapter->hw;
+	u32 dma_ctrl_data;
+
+	dma_ctrl_data = FIELDX(DMA_CTRL_RORDER_MODE, DMA_CTRL_RORDER_MODE_OUT) |
+		DMA_CTRL_RREQ_PRI_DATA |
+		FIELDX(DMA_CTRL_RREQ_BLEN, hw->dmar_block) |
+		FIELDX(DMA_CTRL_WDLY_CNT, DMA_CTRL_WDLY_CNT_DEF) |
+		FIELDX(DMA_CTRL_RDLY_CNT, DMA_CTRL_RDLY_CNT_DEF);
+
+	AT_WRITE_REG(hw, REG_DMA_CTRL, dma_ctrl_data);
+}
+
+/*
+ * Stop the mac, transmit and receive units
+ * hw - Struct containing variables accessed by shared code
+ * return : 0  or  idle status (if error)
+ */
+static int atl1c_stop_mac(struct atl1c_hw *hw)
+{
+	u32 data;
+
+	AT_READ_REG(hw, REG_RXQ_CTRL, &data);
+	data &= ~RXQ_CTRL_EN;
+	AT_WRITE_REG(hw, REG_RXQ_CTRL, data);
+
+	AT_READ_REG(hw, REG_TXQ_CTRL, &data);
+	data &= ~TXQ_CTRL_EN;
+	AT_WRITE_REG(hw, REG_TXQ_CTRL, data);
+
+	atl1c_wait_until_idle(hw, IDLE_STATUS_RXQ_BUSY | IDLE_STATUS_TXQ_BUSY);
+
+	AT_READ_REG(hw, REG_MAC_CTRL, &data);
+	data &= ~(MAC_CTRL_TX_EN | MAC_CTRL_RX_EN);
+	AT_WRITE_REG(hw, REG_MAC_CTRL, data);
+
+	return (int)atl1c_wait_until_idle(hw,
+		IDLE_STATUS_TXMAC_BUSY | IDLE_STATUS_RXMAC_BUSY);
+}
+
+static void atl1c_start_mac(struct atl1c_adapter *adapter)
+{
+	struct atl1c_hw *hw = &adapter->hw;
+	u32 mac, txq, rxq;
+
+	hw->mac_duplex = adapter->link_duplex == FULL_DUPLEX;
+	hw->mac_speed = adapter->link_speed == SPEED_1000 ?
+		atl1c_mac_speed_1000 : atl1c_mac_speed_10_100;
+
+	AT_READ_REG(hw, REG_TXQ_CTRL, &txq);
+	AT_READ_REG(hw, REG_RXQ_CTRL, &rxq);
+	AT_READ_REG(hw, REG_MAC_CTRL, &mac);
+
+	txq |= TXQ_CTRL_EN;
+	rxq |= RXQ_CTRL_EN;
+	mac |= MAC_CTRL_TX_EN | MAC_CTRL_TX_FLOW |
+	       MAC_CTRL_RX_EN | MAC_CTRL_RX_FLOW |
+	       MAC_CTRL_ADD_CRC | MAC_CTRL_PAD |
+	       MAC_CTRL_BC_EN | MAC_CTRL_SINGLE_PAUSE_EN |
+	       MAC_CTRL_HASH_ALG_CRC32;
+	if (hw->mac_duplex)
+		mac |= MAC_CTRL_DUPLX;
+	else
+		mac &= ~MAC_CTRL_DUPLX;
+	mac = FIELD_SETX(mac, MAC_CTRL_SPEED, hw->mac_speed);
+	mac = FIELD_SETX(mac, MAC_CTRL_PRMLEN, hw->preamble_len);
+
+	AT_WRITE_REG(hw, REG_TXQ_CTRL, txq);
+	AT_WRITE_REG(hw, REG_RXQ_CTRL, rxq);
+	AT_WRITE_REG(hw, REG_MAC_CTRL, mac);
+}
+
+/*
+ * Reset the transmit and receive units; mask and clear all interrupts.
+ * hw - Struct containing variables accessed by shared code
+ * return : 0  or  idle status (if error)
+ */
+static int atl1c_reset_mac(struct atl1c_hw *hw)
+{
+	struct atl1c_adapter *adapter = hw->adapter;
+	struct pci_dev *pdev = adapter->pdev;
+	u32 ctrl_data = 0;
+
+	atl1c_stop_mac(hw);
+	/*
+	 * Issue Soft Reset to the MAC.  This will reset the chip's
+	 * transmit, receive, DMA.  It will not effect
+	 * the current PCI configuration.  The global reset bit is self-
+	 * clearing, and should clear within a microsecond.
+	 */
+	AT_READ_REG(hw, REG_MASTER_CTRL, &ctrl_data);
+	ctrl_data |= MASTER_CTRL_OOB_DIS;
+	AT_WRITE_REG(hw, REG_MASTER_CTRL, ctrl_data | MASTER_CTRL_SOFT_RST);
+
+	AT_WRITE_FLUSH(hw);
+	msleep(10);
+	/* Wait at least 10ms for All module to be Idle */
+
+	if (atl1c_wait_until_idle(hw, IDLE_STATUS_MASK)) {
+		dev_err(&pdev->dev,
+			"MAC state machine can't be idle since"
+			" disabled for 10ms second\n");
+		return -1;
+	}
+	AT_WRITE_REG(hw, REG_MASTER_CTRL, ctrl_data);
+
+	/* driver control speed/duplex */
+	AT_READ_REG(hw, REG_MAC_CTRL, &ctrl_data);
+	AT_WRITE_REG(hw, REG_MAC_CTRL, ctrl_data | MAC_CTRL_SPEED_MODE_SW);
+
+	/* clk switch setting */
+	AT_READ_REG(hw, REG_SERDES, &ctrl_data);
+	switch (hw->nic_type) {
+	case athr_l2c_b:
+		ctrl_data &= ~(SERDES_PHY_CLK_SLOWDOWN |
+				SERDES_MAC_CLK_SLOWDOWN);
+		AT_WRITE_REG(hw, REG_SERDES, ctrl_data);
+		break;
+	case athr_l2c_b2:
+	case athr_l1d_2:
+		ctrl_data |= SERDES_PHY_CLK_SLOWDOWN | SERDES_MAC_CLK_SLOWDOWN;
+		AT_WRITE_REG(hw, REG_SERDES, ctrl_data);
+		break;
+	default:
+		break;
+	}
+
+	return 0;
+}
+
+static void atl1c_disable_l0s_l1(struct atl1c_hw *hw)
+{
+	u16 ctrl_flags = hw->ctrl_flags;
+
+	hw->ctrl_flags &= ~(ATL1C_ASPM_L0S_SUPPORT | ATL1C_ASPM_L1_SUPPORT);
+	atl1c_set_aspm(hw, SPEED_0);
+	hw->ctrl_flags = ctrl_flags;
+}
+
+/*
+ * Set ASPM state.
+ * Enable/disable L0s/L1 depend on link state.
+ */
+static void atl1c_set_aspm(struct atl1c_hw *hw, u16 link_speed)
+{
+	u32 pm_ctrl_data;
+	u32 link_l1_timer;
+
+	AT_READ_REG(hw, REG_PM_CTRL, &pm_ctrl_data);
+	pm_ctrl_data &= ~(PM_CTRL_ASPM_L1_EN |
+			  PM_CTRL_ASPM_L0S_EN |
+			  PM_CTRL_MAC_ASPM_CHK);
+	/* L1 timer */
+	if (hw->nic_type == athr_l2c_b2 || hw->nic_type == athr_l1d_2) {
+		pm_ctrl_data &= ~PMCTRL_TXL1_AFTER_L0S;
+		link_l1_timer =
+			link_speed == SPEED_1000 || link_speed == SPEED_100 ?
+			L1D_PMCTRL_L1_ENTRY_TM_16US : 1;
+		pm_ctrl_data = FIELD_SETX(pm_ctrl_data,
+			L1D_PMCTRL_L1_ENTRY_TM, link_l1_timer);
+	} else {
+		link_l1_timer = hw->nic_type == athr_l2c_b ?
+			L2CB1_PM_CTRL_L1_ENTRY_TM : L1C_PM_CTRL_L1_ENTRY_TM;
+		if (link_speed != SPEED_1000 && link_speed != SPEED_100)
+			link_l1_timer = 1;
+		pm_ctrl_data = FIELD_SETX(pm_ctrl_data,
+			PM_CTRL_L1_ENTRY_TIMER, link_l1_timer);
+	}
+
+	/* L0S/L1 enable */
+	if ((hw->ctrl_flags & ATL1C_ASPM_L0S_SUPPORT) && link_speed != SPEED_0)
+		pm_ctrl_data |= PM_CTRL_ASPM_L0S_EN | PM_CTRL_MAC_ASPM_CHK;
+	if (hw->ctrl_flags & ATL1C_ASPM_L1_SUPPORT)
+		pm_ctrl_data |= PM_CTRL_ASPM_L1_EN | PM_CTRL_MAC_ASPM_CHK;
+
+	/* l2cb & l1d & l2cb2 & l1d2 */
+	if (hw->nic_type == athr_l2c_b || hw->nic_type == athr_l1d ||
+	    hw->nic_type == athr_l2c_b2 || hw->nic_type == athr_l1d_2) {
+		pm_ctrl_data = FIELD_SETX(pm_ctrl_data,
+			PM_CTRL_PM_REQ_TIMER, PM_CTRL_PM_REQ_TO_DEF);
+		pm_ctrl_data |= PM_CTRL_RCVR_WT_TIMER |
+				PM_CTRL_SERDES_PD_EX_L1 |
+				PM_CTRL_CLK_SWH_L1;
+		pm_ctrl_data &= ~(PM_CTRL_SERDES_L1_EN |
+				  PM_CTRL_SERDES_PLL_L1_EN |
+				  PM_CTRL_SERDES_BUFS_RX_L1_EN |
+				  PM_CTRL_SA_DLY_EN |
+				  PM_CTRL_HOTRST);
+		/* disable l0s if link down or l2cb */
+		if (link_speed == SPEED_0 || hw->nic_type == athr_l2c_b)
+			pm_ctrl_data &= ~PM_CTRL_ASPM_L0S_EN;
+	} else { /* l1c */
+		pm_ctrl_data =
+			FIELD_SETX(pm_ctrl_data, PM_CTRL_L1_ENTRY_TIMER, 0);
+		if (link_speed != SPEED_0) {
+			pm_ctrl_data |= PM_CTRL_SERDES_L1_EN |
+					PM_CTRL_SERDES_PLL_L1_EN |
+					PM_CTRL_SERDES_BUFS_RX_L1_EN;
+			pm_ctrl_data &= ~(PM_CTRL_SERDES_PD_EX_L1 |
+					  PM_CTRL_CLK_SWH_L1 |
+					  PM_CTRL_ASPM_L0S_EN |
+					  PM_CTRL_ASPM_L1_EN);
+		} else { /* link down */
+			pm_ctrl_data |= PM_CTRL_CLK_SWH_L1;
+			pm_ctrl_data &= ~(PM_CTRL_SERDES_L1_EN |
+					  PM_CTRL_SERDES_PLL_L1_EN |
+					  PM_CTRL_SERDES_BUFS_RX_L1_EN |
+					  PM_CTRL_ASPM_L0S_EN);
+		}
+	}
+	AT_WRITE_REG(hw, REG_PM_CTRL, pm_ctrl_data);
+
+	return;
+}
+
+/**
+ * atl1c_configure_mac - Configure Transmit&Receive Unit after Reset
+ * @adapter: board private structure
+ *
+ * Configure the Tx /Rx unit of the MAC after a reset.
+ */
+static int atl1c_configure_mac(struct atl1c_adapter *adapter)
+{
+	struct atl1c_hw *hw = &adapter->hw;
+	u32 master_ctrl_data = 0;
+	u32 intr_modrt_data;
+	u32 data;
+
+	AT_READ_REG(hw, REG_MASTER_CTRL, &master_ctrl_data);
+	master_ctrl_data &= ~(MASTER_CTRL_TX_ITIMER_EN |
+			      MASTER_CTRL_RX_ITIMER_EN |
+			      MASTER_CTRL_INT_RDCLR);
+	/* clear interrupt status */
+	AT_WRITE_REG(hw, REG_ISR, 0xFFFFFFFF);
+	/*  Clear any WOL status */
+	AT_WRITE_REG(hw, REG_WOL_CTRL, 0);
+	/* set Interrupt Clear Timer
+	 * HW will enable self to assert interrupt event to system after
+	 * waiting x-time for software to notify it accept interrupt.
+	 */
+
+	data = CLK_GATING_EN_ALL;
+	if (hw->ctrl_flags & ATL1C_CLK_GATING_EN) {
+		if (hw->nic_type == athr_l2c_b)
+			data &= ~CLK_GATING_RXMAC_EN;
+	} else
+		data = 0;
+	AT_WRITE_REG(hw, REG_CLK_GATING_CTRL, data);
+
+	AT_WRITE_REG(hw, REG_INT_RETRIG_TIMER,
+		hw->ict & INT_RETRIG_TIMER_MASK);
+
+	atl1c_configure_des_ring(adapter);
+
+	if (hw->ctrl_flags & ATL1C_INTR_MODRT_ENABLE) {
+		intr_modrt_data = (hw->tx_imt & IRQ_MODRT_TIMER_MASK) <<
+					IRQ_MODRT_TX_TIMER_SHIFT;
+		intr_modrt_data |= (hw->rx_imt & IRQ_MODRT_TIMER_MASK) <<
+					IRQ_MODRT_RX_TIMER_SHIFT;
+		AT_WRITE_REG(hw, REG_IRQ_MODRT_TIMER_INIT, intr_modrt_data);
+		master_ctrl_data |=
+			MASTER_CTRL_TX_ITIMER_EN | MASTER_CTRL_RX_ITIMER_EN;
+	}
+
+	if (hw->ctrl_flags & ATL1C_INTR_CLEAR_ON_READ)
+		master_ctrl_data |= MASTER_CTRL_INT_RDCLR;
+
+	master_ctrl_data |= MASTER_CTRL_SA_TIMER_EN;
+	AT_WRITE_REG(hw, REG_MASTER_CTRL, master_ctrl_data);
+
+	AT_WRITE_REG(hw, REG_SMB_STAT_TIMER,
+		hw->smb_timer & SMB_STAT_TIMER_MASK);
+
+	/* set MTU */
+	AT_WRITE_REG(hw, REG_MTU, hw->max_frame_size + ETH_HLEN +
+			VLAN_HLEN + ETH_FCS_LEN);
+
+	atl1c_configure_tx(adapter);
+	atl1c_configure_rx(adapter);
+	atl1c_configure_dma(adapter);
+
+	return 0;
+}
+
+static int atl1c_configure(struct atl1c_adapter *adapter)
+{
+	struct net_device *netdev = adapter->netdev;
+	int num;
+	int i;
+
+	if (adapter->hw.nic_type == athr_mt) {
+		u32 mode;
+
+		AT_READ_REG(&adapter->hw, REG_MT_MODE, &mode);
+		if (adapter->rx_queue_count == 4)
+			mode |= MT_MODE_4Q;
+		else
+			mode &= ~MT_MODE_4Q;
+		AT_WRITE_REG(&adapter->hw, REG_MT_MODE, mode);
+	}
+
+	atl1c_init_ring_ptrs(adapter);
+	atl1c_set_multi(netdev);
+	atl1c_restore_vlan(adapter);
+
+	for (i = 0; i < adapter->rx_queue_count; ++i) {
+		num = atl1c_alloc_rx_buffer(adapter, i, false);
+		if (unlikely(num == 0))
+			return -ENOMEM;
+	}
+
+	if (atl1c_configure_mac(adapter))
+		return -EIO;
+
+	return 0;
+}
+
+static void atl1c_update_hw_stats(struct atl1c_adapter *adapter)
+{
+	u16 hw_reg_addr = 0;
+	unsigned long *stats_item = NULL;
+	u32 data;
+
+	/* 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) {
+		AT_READ_REG(&adapter->hw, hw_reg_addr, &data);
+		*stats_item += data;
+		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) {
+		AT_READ_REG(&adapter->hw, hw_reg_addr, &data);
+		*stats_item += data;
+		stats_item++;
+		hw_reg_addr += 4;
+	}
+}
+
+/**
+ * atl1c_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 *atl1c_get_stats(struct net_device *netdev)
+{
+	struct atl1c_adapter *adapter = netdev_priv(netdev);
+	struct atl1c_hw_stats  *hw_stats = &adapter->hw_stats;
+	struct net_device_stats *net_stats = &netdev->stats;
+
+	atl1c_update_hw_stats(adapter);
+	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 inline void atl1c_clear_phy_int(struct atl1c_adapter *adapter)
+{
+	u16 phy_data;
+
+	spin_lock(&adapter->mdio_lock);
+	atl1c_read_phy_reg(&adapter->hw, MII_ISR, &phy_data);
+	spin_unlock(&adapter->mdio_lock);
+}
+
+static int atl1c_clean_tx(struct napi_struct *napi, int budget)
+{
+	struct atl1c_tpd_ring *tpd_ring =
+		container_of(napi, struct atl1c_tpd_ring, napi);
+	struct atl1c_adapter *adapter = tpd_ring->adapter;
+	struct netdev_queue *txq =
+		netdev_get_tx_queue(napi->dev, tpd_ring->num);
+	struct atl1c_buffer *buffer_info;
+	struct pci_dev *pdev = adapter->pdev;
+	u16 next_to_clean = atomic_read(&tpd_ring->next_to_clean);
+	u16 hw_next_to_clean;
+	unsigned int total_bytes = 0, total_packets = 0;
+	unsigned long flags;
+
+	AT_READ_REGW(&adapter->hw, atl1c_qregs[tpd_ring->num].tpd_cons,
+		     &hw_next_to_clean);
+
+	while (next_to_clean != hw_next_to_clean) {
+		buffer_info = &tpd_ring->buffer_info[next_to_clean];
+		if (buffer_info->skb) {
+			total_bytes += buffer_info->skb->len;
+			total_packets++;
+		}
+		atl1c_clean_buffer(pdev, buffer_info);
+		if (++next_to_clean == tpd_ring->count)
+			next_to_clean = 0;
+		atomic_set(&tpd_ring->next_to_clean, next_to_clean);
+	}
+
+	netdev_tx_completed_queue(txq, total_packets, total_bytes);
+
+	if (netif_tx_queue_stopped(txq) && netif_carrier_ok(adapter->netdev))
+		netif_tx_wake_queue(txq);
+
+	if (total_packets < budget) {
+		napi_complete_done(napi, total_packets);
+		spin_lock_irqsave(&adapter->hw.intr_mask_lock, flags);
+		adapter->hw.intr_mask |= atl1c_qregs[tpd_ring->num].tx_isr;
+		AT_WRITE_REG(&adapter->hw, REG_IMR, adapter->hw.intr_mask);
+		spin_unlock_irqrestore(&adapter->hw.intr_mask_lock, flags);
+		return total_packets;
+	}
+	return budget;
+}
+
+static void atl1c_intr_rx_tx(struct atl1c_adapter *adapter, u32 status)
+{
+	struct atl1c_hw *hw = &adapter->hw;
+	u32 intr_mask;
+	int i;
+
+	spin_lock(&hw->intr_mask_lock);
+	intr_mask = hw->intr_mask;
+	for (i = 0; i < adapter->rx_queue_count; ++i) {
+		if (!(status & atl1c_qregs[i].rx_isr))
+			continue;
+		if (napi_schedule_prep(&adapter->rrd_ring[i].napi)) {
+			intr_mask &= ~atl1c_qregs[i].rx_isr;
+			__napi_schedule(&adapter->rrd_ring[i].napi);
+		}
+	}
+	for (i = 0; i < adapter->tx_queue_count; ++i) {
+		if (!(status & atl1c_qregs[i].tx_isr))
+			continue;
+		if (napi_schedule_prep(&adapter->tpd_ring[i].napi)) {
+			intr_mask &= ~atl1c_qregs[i].tx_isr;
+			__napi_schedule(&adapter->tpd_ring[i].napi);
+		}
+	}
+
+	if (hw->intr_mask != intr_mask) {
+		hw->intr_mask = intr_mask;
+		AT_WRITE_REG(hw, REG_IMR, hw->intr_mask);
+	}
+	spin_unlock(&hw->intr_mask_lock);
+}
+
+/**
+ * atl1c_intr - Interrupt Handler
+ * @irq: interrupt number
+ * @data: pointer to a network interface device structure
+ */
+static irqreturn_t atl1c_intr(int irq, void *data)
+{
+	struct net_device *netdev  = data;
+	struct atl1c_adapter *adapter = netdev_priv(netdev);
+	struct pci_dev *pdev = adapter->pdev;
+	struct atl1c_hw *hw = &adapter->hw;
+	int max_ints = AT_MAX_INT_WORK;
+	int handled = IRQ_NONE;
+	u32 status;
+	u32 reg_data;
+
+	do {
+		AT_READ_REG(hw, REG_ISR, &reg_data);
+		status = reg_data & hw->intr_mask;
+
+		if (status == 0 || (status & ISR_DIS_INT) != 0) {
+			if (max_ints != AT_MAX_INT_WORK)
+				handled = IRQ_HANDLED;
+			break;
+		}
+		/* link event */
+		if (status & ISR_GPHY)
+			atl1c_clear_phy_int(adapter);
+		/* Ack ISR */
+		AT_WRITE_REG(hw, REG_ISR, status | ISR_DIS_INT);
+		if (status & (ISR_RX_PKT | ISR_TX_PKT))
+			atl1c_intr_rx_tx(adapter, status);
+
+		handled = IRQ_HANDLED;
+		/* check if PCIE PHY Link down */
+		if (status & ISR_ERROR) {
+			if (netif_msg_hw(adapter))
+				dev_err(&pdev->dev,
+					"atl1c hardware error (status = 0x%x)\n",
+					status & ISR_ERROR);
+			/* reset MAC */
+			set_bit(ATL1C_WORK_EVENT_RESET, &adapter->work_event);
+			schedule_work(&adapter->common_task);
+			return IRQ_HANDLED;
+		}
+
+		if (status & ISR_OVER)
+			if (netif_msg_intr(adapter))
+				dev_warn(&pdev->dev,
+					"TX/RX overflow (status = 0x%x)\n",
+					status & ISR_OVER);
+
+		/* link event */
+		if (status & (ISR_GPHY | ISR_MANUAL)) {
+			netdev->stats.tx_carrier_errors++;
+			atl1c_link_chg_event(adapter);
+			break;
+		}
+
+	} while (--max_ints > 0);
+	/* re-enable Interrupt*/
+	AT_WRITE_REG(&adapter->hw, REG_ISR, 0);
+	return handled;
+}
+
+static inline void atl1c_rx_checksum(struct atl1c_adapter *adapter,
+		  struct sk_buff *skb, struct atl1c_recv_ret_status *prrs)
+{
+	if (adapter->hw.nic_type == athr_mt) {
+		if (prrs->word3 & RRS_MT_PROT_ID_TCPUDP)
+			skb->ip_summed = CHECKSUM_UNNECESSARY;
+		return;
+	}
+	/*
+	 * The pid field in RRS in not correct sometimes, so we
+	 * cannot figure out if the packet is fragmented or not,
+	 * so we tell the KERNEL CHECKSUM_NONE
+	 */
+	skb_checksum_none_assert(skb);
+}
+
+static int atl1c_alloc_rx_buffer(struct atl1c_adapter *adapter, u32 queue,
+				 bool napi_mode)
+{
+	struct atl1c_rfd_ring *rfd_ring = &adapter->rfd_ring[queue];
+	struct atl1c_rrd_ring *rrd_ring = &adapter->rrd_ring[queue];
+	struct pci_dev *pdev = adapter->pdev;
+	struct atl1c_buffer *buffer_info, *next_info;
+	struct sk_buff *skb;
+	void *vir_addr = NULL;
+	u16 num_alloc = 0;
+	u16 rfd_next_to_use, next_next;
+	struct atl1c_rx_free_desc *rfd_desc;
+	dma_addr_t mapping;
+
+	next_next = rfd_next_to_use = rfd_ring->next_to_use;
+	if (++next_next == rfd_ring->count)
+		next_next = 0;
+	buffer_info = &rfd_ring->buffer_info[rfd_next_to_use];
+	next_info = &rfd_ring->buffer_info[next_next];
+
+	while (next_info->flags & ATL1C_BUFFER_FREE) {
+		rfd_desc = ATL1C_RFD_DESC(rfd_ring, rfd_next_to_use);
+
+		/* When DMA RX address is set to something like
+		 * 0x....fc0, it will be very likely to cause DMA
+		 * RFD overflow issue.
+		 *
+		 * To work around it, we apply rx skb with 64 bytes
+		 * longer space, and offset the address whenever
+		 * 0x....fc0 is detected.
+		 */
+		if (likely(napi_mode))
+			skb = napi_alloc_skb(&rrd_ring->napi, adapter->rx_buffer_len + 64);
+		else
+			skb = netdev_alloc_skb(adapter->netdev, adapter->rx_buffer_len + 64);
+		if (unlikely(!skb)) {
+			if (netif_msg_rx_err(adapter))
+				dev_warn(&pdev->dev, "alloc rx buffer failed\n");
+			break;
+		}
+
+		if (((unsigned long)skb->data & 0xfff) == 0xfc0)
+			skb_reserve(skb, 64);
+
+		/*
+		 * Make buffer alignment 2 beyond a 16 byte boundary
+		 * this will result in a 16 byte aligned IP header after
+		 * the 14 byte MAC header is removed
+		 */
+		vir_addr = skb->data;
+		ATL1C_SET_BUFFER_STATE(buffer_info, ATL1C_BUFFER_BUSY);
+		buffer_info->skb = skb;
+		buffer_info->length = adapter->rx_buffer_len;
+		mapping = dma_map_single(&pdev->dev, vir_addr,
+					 buffer_info->length, DMA_FROM_DEVICE);
+		if (unlikely(dma_mapping_error(&pdev->dev, mapping))) {
+			dev_kfree_skb(skb);
+			buffer_info->skb = NULL;
+			buffer_info->length = 0;
+			ATL1C_SET_BUFFER_STATE(buffer_info, ATL1C_BUFFER_FREE);
+			netif_warn(adapter, rx_err, adapter->netdev, "RX dma_map_single failed");
+			break;
+		}
+		buffer_info->dma = mapping;
+		ATL1C_SET_PCIMAP_TYPE(buffer_info, ATL1C_PCIMAP_SINGLE,
+			ATL1C_PCIMAP_FROMDEVICE);
+		rfd_desc->buffer_addr = cpu_to_le64(buffer_info->dma);
+		rfd_next_to_use = next_next;
+		if (++next_next == rfd_ring->count)
+			next_next = 0;
+		buffer_info = &rfd_ring->buffer_info[rfd_next_to_use];
+		next_info = &rfd_ring->buffer_info[next_next];
+		num_alloc++;
+	}
+
+	if (num_alloc) {
+		/* TODO: update mailbox here */
+		wmb();
+		rfd_ring->next_to_use = rfd_next_to_use;
+		AT_WRITE_REG(&adapter->hw, atl1c_qregs[queue].rfd_prod,
+			     rfd_ring->next_to_use & MB_RFDX_PROD_IDX_MASK);
+	}
+
+	return num_alloc;
+}
+
+static void atl1c_clean_rrd(struct atl1c_rrd_ring *rrd_ring,
+			struct	atl1c_recv_ret_status *rrs, u16 num)
+{
+	u16 i;
+	/* the relationship between rrd and rfd is one map one */
+	for (i = 0; i < num; i++, rrs = ATL1C_RRD_DESC(rrd_ring,
+					rrd_ring->next_to_clean)) {
+		rrs->word3 &= ~RRS_RXD_UPDATED;
+		if (++rrd_ring->next_to_clean == rrd_ring->count)
+			rrd_ring->next_to_clean = 0;
+	}
+}
+
+static void atl1c_clean_rfd(struct atl1c_rfd_ring *rfd_ring,
+	struct atl1c_recv_ret_status *rrs, u16 num)
+{
+	u16 i;
+	u16 rfd_index;
+	struct atl1c_buffer *buffer_info = rfd_ring->buffer_info;
+
+	rfd_index = (rrs->word0 >> RRS_RX_RFD_INDEX_SHIFT) &
+			RRS_RX_RFD_INDEX_MASK;
+	for (i = 0; i < num; i++) {
+		buffer_info[rfd_index].skb = NULL;
+		ATL1C_SET_BUFFER_STATE(&buffer_info[rfd_index],
+					ATL1C_BUFFER_FREE);
+		if (++rfd_index == rfd_ring->count)
+			rfd_index = 0;
+	}
+	rfd_ring->next_to_clean = rfd_index;
+}
+
+/**
+ * atl1c_clean_rx - NAPI Rx polling callback
+ * @napi: napi info
+ * @budget: limit of packets to clean
+ */
+static int atl1c_clean_rx(struct napi_struct *napi, int budget)
+{
+	struct atl1c_rrd_ring *rrd_ring =
+		container_of(napi, struct atl1c_rrd_ring, napi);
+	struct atl1c_adapter *adapter = rrd_ring->adapter;
+	u16 rfd_num, rfd_index;
+	u16 length;
+	struct pci_dev *pdev = adapter->pdev;
+	struct net_device *netdev  = adapter->netdev;
+	struct atl1c_rfd_ring *rfd_ring = &adapter->rfd_ring[rrd_ring->num];
+	struct sk_buff *skb;
+	struct atl1c_recv_ret_status *rrs;
+	struct atl1c_buffer *buffer_info;
+	int work_done = 0;
+	unsigned long flags;
+
+	/* Keep link state information with original netdev */
+	if (!netif_carrier_ok(adapter->netdev))
+		goto quit_polling;
+
+	while (1) {
+		if (work_done >= budget)
+			break;
+		rrs = ATL1C_RRD_DESC(rrd_ring, rrd_ring->next_to_clean);
+		if (likely(RRS_RXD_IS_VALID(rrs->word3))) {
+			rfd_num = (rrs->word0 >> RRS_RX_RFD_CNT_SHIFT) &
+				RRS_RX_RFD_CNT_MASK;
+			if (unlikely(rfd_num != 1))
+				/* TODO support mul rfd*/
+				if (netif_msg_rx_err(adapter))
+					dev_warn(&pdev->dev,
+						"Multi rfd not support yet!\n");
+			goto rrs_checked;
+		} else {
+			break;
+		}
+rrs_checked:
+		atl1c_clean_rrd(rrd_ring, rrs, rfd_num);
+		if (rrs->word3 & (RRS_RX_ERR_SUM | RRS_802_3_LEN_ERR)) {
+			atl1c_clean_rfd(rfd_ring, rrs, rfd_num);
+			if (netif_msg_rx_err(adapter))
+				dev_warn(&pdev->dev,
+					 "wrong packet! rrs word3 is %x\n",
+					 rrs->word3);
+			continue;
+		}
+
+		length = le16_to_cpu((rrs->word3 >> RRS_PKT_SIZE_SHIFT) &
+				RRS_PKT_SIZE_MASK);
+		/* Good Receive */
+		if (likely(rfd_num == 1)) {
+			rfd_index = (rrs->word0 >> RRS_RX_RFD_INDEX_SHIFT) &
+					RRS_RX_RFD_INDEX_MASK;
+			buffer_info = &rfd_ring->buffer_info[rfd_index];
+			dma_unmap_single(&pdev->dev, buffer_info->dma,
+					 buffer_info->length, DMA_FROM_DEVICE);
+			skb = buffer_info->skb;
+		} else {
+			/* TODO */
+			if (netif_msg_rx_err(adapter))
+				dev_warn(&pdev->dev,
+					"Multi rfd not support yet!\n");
+			break;
+		}
+		atl1c_clean_rfd(rfd_ring, rrs, rfd_num);
+		skb_put(skb, length - ETH_FCS_LEN);
+		skb->protocol = eth_type_trans(skb, netdev);
+		atl1c_rx_checksum(adapter, skb, rrs);
+		if (rrs->word3 & RRS_VLAN_INS) {
+			u16 vlan;
+
+			AT_TAG_TO_VLAN(rrs->vlan_tag, vlan);
+			vlan = le16_to_cpu(vlan);
+			__vlan_hwaccel_put_tag(skb, htons(ETH_P_8021Q), vlan);
+		}
+		napi_gro_receive(napi, skb);
+
+		work_done++;
+	}
+	if (work_done)
+		atl1c_alloc_rx_buffer(adapter, rrd_ring->num, true);
+
+	if (work_done < budget) {
+quit_polling:
+		napi_complete_done(napi, work_done);
+		spin_lock_irqsave(&adapter->hw.intr_mask_lock, flags);
+		adapter->hw.intr_mask |= atl1c_qregs[rrd_ring->num].rx_isr;
+		AT_WRITE_REG(&adapter->hw, REG_IMR, adapter->hw.intr_mask);
+		spin_unlock_irqrestore(&adapter->hw.intr_mask_lock, flags);
+	}
+	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 atl1c_netpoll(struct net_device *netdev)
+{
+	struct atl1c_adapter *adapter = netdev_priv(netdev);
+
+	disable_irq(adapter->pdev->irq);
+	atl1c_intr(adapter->pdev->irq, netdev);
+	enable_irq(adapter->pdev->irq);
+}
+#endif
+
+static inline u16 atl1c_tpd_avail(struct atl1c_adapter *adapter, u32 queue)
+{
+	struct atl1c_tpd_ring *tpd_ring = &adapter->tpd_ring[queue];
+	u16 next_to_use = 0;
+	u16 next_to_clean = 0;
+
+	next_to_clean = atomic_read(&tpd_ring->next_to_clean);
+	next_to_use   = tpd_ring->next_to_use;
+
+	return (u16)(next_to_clean > next_to_use) ?
+		(next_to_clean - next_to_use - 1) :
+		(tpd_ring->count + next_to_clean - next_to_use - 1);
+}
+
+/*
+ * get next usable tpd
+ * Note: should call atl1c_tdp_avail to make sure
+ * there is enough tpd to use
+ */
+static struct atl1c_tpd_desc *atl1c_get_tpd(struct atl1c_adapter *adapter,
+					    u32 queue)
+{
+	struct atl1c_tpd_ring *tpd_ring = &adapter->tpd_ring[queue];
+	struct atl1c_tpd_desc *tpd_desc;
+	u16 next_to_use = 0;
+
+	next_to_use = tpd_ring->next_to_use;
+	if (++tpd_ring->next_to_use == tpd_ring->count)
+		tpd_ring->next_to_use = 0;
+	tpd_desc = ATL1C_TPD_DESC(tpd_ring, next_to_use);
+	memset(tpd_desc, 0, sizeof(struct atl1c_tpd_desc));
+	return	tpd_desc;
+}
+
+static struct atl1c_buffer *
+atl1c_get_tx_buffer(struct atl1c_adapter *adapter, struct atl1c_tpd_desc *tpd)
+{
+	struct atl1c_tpd_ring *tpd_ring = adapter->tpd_ring;
+
+	return &tpd_ring->buffer_info[tpd -
+			(struct atl1c_tpd_desc *)tpd_ring->desc];
+}
+
+/* Calculate the transmit packet descript needed*/
+static u16 atl1c_cal_tpd_req(const struct sk_buff *skb)
+{
+	u16 tpd_req;
+	u16 proto_hdr_len = 0;
+
+	tpd_req = skb_shinfo(skb)->nr_frags + 1;
+
+	if (skb_is_gso(skb)) {
+		proto_hdr_len = skb_tcp_all_headers(skb);
+		if (proto_hdr_len < skb_headlen(skb))
+			tpd_req++;
+		if (skb_shinfo(skb)->gso_type & SKB_GSO_TCPV6)
+			tpd_req++;
+	}
+	return tpd_req;
+}
+
+static int atl1c_tso_csum(struct atl1c_adapter *adapter,
+			  struct sk_buff *skb,
+			  struct atl1c_tpd_desc **tpd,
+			  u32 queue)
+{
+	struct pci_dev *pdev = adapter->pdev;
+	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) {
+				err = pskb_trim(skb, real_len);
+				if (err)
+					return err;
+			}
+
+			hdr_len = skb_tcp_all_headers(skb);
+			if (unlikely(skb->len == hdr_len)) {
+				/* only xsum need */
+				if (netif_msg_tx_queued(adapter))
+					dev_warn(&pdev->dev,
+						"IPV4 tso with zero data??\n");
+				goto check_sum;
+			} else {
+				ip_hdr(skb)->check = 0;
+				tcp_hdr(skb)->check = ~csum_tcpudp_magic(
+							ip_hdr(skb)->saddr,
+							ip_hdr(skb)->daddr,
+							0, IPPROTO_TCP, 0);
+				(*tpd)->word1 |= 1 << TPD_IPV4_PACKET_SHIFT;
+			}
+		}
+
+		if (offload_type & SKB_GSO_TCPV6) {
+			struct atl1c_tpd_ext_desc *etpd =
+				*(struct atl1c_tpd_ext_desc **)(tpd);
+
+			memset(etpd, 0, sizeof(struct atl1c_tpd_ext_desc));
+			*tpd = atl1c_get_tpd(adapter, queue);
+			ipv6_hdr(skb)->payload_len = 0;
+			/* check payload == 0 byte ? */
+			hdr_len = skb_tcp_all_headers(skb);
+			if (unlikely(skb->len == hdr_len)) {
+				/* only xsum need */
+				if (netif_msg_tx_queued(adapter))
+					dev_warn(&pdev->dev,
+						"IPV6 tso with zero data??\n");
+				goto check_sum;
+			} else
+				tcp_v6_gso_csum_prep(skb);
+
+			etpd->word1 |= 1 << TPD_LSO_EN_SHIFT;
+			etpd->word1 |= 1 << TPD_LSO_VER_SHIFT;
+			etpd->pkt_len = cpu_to_le32(skb->len);
+			(*tpd)->word1 |= 1 << TPD_LSO_VER_SHIFT;
+		}
+
+		(*tpd)->word1 |= 1 << TPD_LSO_EN_SHIFT;
+		(*tpd)->word1 |= (skb_transport_offset(skb) & TPD_TCPHDR_OFFSET_MASK) <<
+				TPD_TCPHDR_OFFSET_SHIFT;
+		(*tpd)->word1 |= (skb_shinfo(skb)->gso_size & TPD_MSS_MASK) <<
+				TPD_MSS_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)) {
+			if (netif_msg_tx_err(adapter))
+				dev_err(&adapter->pdev->dev,
+					"payload offset should not an event number\n");
+			return -1;
+		} else {
+			css = cso + skb->csum_offset;
+
+			(*tpd)->word1 |= ((cso >> 1) & TPD_PLOADOFFSET_MASK) <<
+					TPD_PLOADOFFSET_SHIFT;
+			(*tpd)->word1 |= ((css >> 1) & TPD_CCSUM_OFFSET_MASK) <<
+					TPD_CCSUM_OFFSET_SHIFT;
+			(*tpd)->word1 |= 1 << TPD_CCSUM_EN_SHIFT;
+		}
+	}
+	return 0;
+}
+
+static void atl1c_tx_rollback(struct atl1c_adapter *adpt,
+			      struct atl1c_tpd_desc *first_tpd,
+			      u32 queue)
+{
+	struct atl1c_tpd_ring *tpd_ring = &adpt->tpd_ring[queue];
+	struct atl1c_buffer *buffer_info;
+	struct atl1c_tpd_desc *tpd;
+	u16 first_index, index;
+
+	first_index = first_tpd - (struct atl1c_tpd_desc *)tpd_ring->desc;
+	index = first_index;
+	while (index != tpd_ring->next_to_use) {
+		tpd = ATL1C_TPD_DESC(tpd_ring, index);
+		buffer_info = &tpd_ring->buffer_info[index];
+		atl1c_clean_buffer(adpt->pdev, buffer_info);
+		memset(tpd, 0, sizeof(struct atl1c_tpd_desc));
+		if (++index == tpd_ring->count)
+			index = 0;
+	}
+	tpd_ring->next_to_use = first_index;
+}
+
+static int atl1c_tx_map(struct atl1c_adapter *adapter,
+			struct sk_buff *skb, struct atl1c_tpd_desc *tpd,
+			u32 queue)
+{
+	struct atl1c_tpd_desc *use_tpd = NULL;
+	struct atl1c_buffer *buffer_info = 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 tso;
+
+	nr_frags = skb_shinfo(skb)->nr_frags;
+	tso = (tpd->word1 >> TPD_LSO_EN_SHIFT) & TPD_LSO_EN_MASK;
+	if (tso) {
+		/* TSO */
+		hdr_len = skb_tcp_all_headers(skb);
+		map_len = hdr_len;
+		use_tpd = tpd;
+
+		buffer_info = atl1c_get_tx_buffer(adapter, use_tpd);
+		buffer_info->length = map_len;
+		buffer_info->dma = dma_map_single(&adapter->pdev->dev,
+						  skb->data, hdr_len,
+						  DMA_TO_DEVICE);
+		if (unlikely(dma_mapping_error(&adapter->pdev->dev, buffer_info->dma)))
+			goto err_dma;
+		ATL1C_SET_BUFFER_STATE(buffer_info, ATL1C_BUFFER_BUSY);
+		ATL1C_SET_PCIMAP_TYPE(buffer_info, ATL1C_PCIMAP_SINGLE,
+			ATL1C_PCIMAP_TODEVICE);
+		mapped_len += map_len;
+		use_tpd->buffer_addr = cpu_to_le64(buffer_info->dma);
+		use_tpd->buffer_len = cpu_to_le16(buffer_info->length);
+	}
+
+	if (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 = atl1c_get_tpd(adapter, queue);
+			memcpy(use_tpd, tpd, sizeof(struct atl1c_tpd_desc));
+		}
+		buffer_info = atl1c_get_tx_buffer(adapter, use_tpd);
+		buffer_info->length = buf_len - mapped_len;
+		buffer_info->dma =
+			dma_map_single(&adapter->pdev->dev,
+				       skb->data + mapped_len,
+				       buffer_info->length, DMA_TO_DEVICE);
+		if (unlikely(dma_mapping_error(&adapter->pdev->dev, buffer_info->dma)))
+			goto err_dma;
+
+		ATL1C_SET_BUFFER_STATE(buffer_info, ATL1C_BUFFER_BUSY);
+		ATL1C_SET_PCIMAP_TYPE(buffer_info, ATL1C_PCIMAP_SINGLE,
+			ATL1C_PCIMAP_TODEVICE);
+		use_tpd->buffer_addr = cpu_to_le64(buffer_info->dma);
+		use_tpd->buffer_len  = cpu_to_le16(buffer_info->length);
+	}
+
+	for (f = 0; f < nr_frags; f++) {
+		skb_frag_t *frag = &skb_shinfo(skb)->frags[f];
+
+		use_tpd = atl1c_get_tpd(adapter, queue);
+		memcpy(use_tpd, tpd, sizeof(struct atl1c_tpd_desc));
+
+		buffer_info = atl1c_get_tx_buffer(adapter, use_tpd);
+		buffer_info->length = skb_frag_size(frag);
+		buffer_info->dma = skb_frag_dma_map(&adapter->pdev->dev,
+						    frag, 0,
+						    buffer_info->length,
+						    DMA_TO_DEVICE);
+		if (dma_mapping_error(&adapter->pdev->dev, buffer_info->dma))
+			goto err_dma;
+
+		ATL1C_SET_BUFFER_STATE(buffer_info, ATL1C_BUFFER_BUSY);
+		ATL1C_SET_PCIMAP_TYPE(buffer_info, ATL1C_PCIMAP_PAGE,
+			ATL1C_PCIMAP_TODEVICE);
+		use_tpd->buffer_addr = cpu_to_le64(buffer_info->dma);
+		use_tpd->buffer_len  = cpu_to_le16(buffer_info->length);
+	}
+
+	/* The last tpd */
+	use_tpd->word1 |= 1 << TPD_EOP_SHIFT;
+	/* The last buffer info contain the skb address,
+	   so it will be free after unmap */
+	buffer_info->skb = skb;
+
+	return 0;
+
+err_dma:
+	buffer_info->dma = 0;
+	buffer_info->length = 0;
+	return -1;
+}
+
+static void atl1c_tx_queue(struct atl1c_adapter *adapter, u32 queue)
+{
+	struct atl1c_tpd_ring *tpd_ring = &adapter->tpd_ring[queue];
+
+	AT_WRITE_REGW(&adapter->hw, atl1c_qregs[queue].tpd_prod,
+		      tpd_ring->next_to_use);
+}
+
+static netdev_tx_t atl1c_xmit_frame(struct sk_buff *skb,
+					  struct net_device *netdev)
+{
+	struct atl1c_adapter *adapter = netdev_priv(netdev);
+	u32 queue = skb_get_queue_mapping(skb);
+	struct netdev_queue *txq = netdev_get_tx_queue(netdev, queue);
+	struct atl1c_tpd_desc *tpd;
+	u16 tpd_req;
+
+	if (test_bit(__AT_DOWN, &adapter->flags)) {
+		dev_kfree_skb_any(skb);
+		return NETDEV_TX_OK;
+	}
+
+	tpd_req = atl1c_cal_tpd_req(skb);
+
+	if (atl1c_tpd_avail(adapter, queue) < tpd_req) {
+		/* no enough descriptor, just stop queue */
+		atl1c_tx_queue(adapter, queue);
+		netif_tx_stop_queue(txq);
+		return NETDEV_TX_BUSY;
+	}
+
+	tpd = atl1c_get_tpd(adapter, queue);
+
+	/* do TSO and check sum */
+	if (atl1c_tso_csum(adapter, skb, &tpd, queue) != 0) {
+		atl1c_tx_queue(adapter, queue);
+		dev_kfree_skb_any(skb);
+		return NETDEV_TX_OK;
+	}
+
+	if (unlikely(skb_vlan_tag_present(skb))) {
+		u16 vlan = skb_vlan_tag_get(skb);
+		__le16 tag;
+
+		vlan = cpu_to_le16(vlan);
+		AT_VLAN_TO_TAG(vlan, tag);
+		tpd->word1 |= 1 << TPD_INS_VTAG_SHIFT;
+		tpd->vlan_tag = tag;
+	}
+
+	if (skb_network_offset(skb) != ETH_HLEN)
+		tpd->word1 |= 1 << TPD_ETH_TYPE_SHIFT; /* Ethernet frame */
+
+	if (atl1c_tx_map(adapter, skb, tpd, queue) < 0) {
+		netif_info(adapter, tx_done, adapter->netdev,
+			   "tx-skb dropped due to dma error\n");
+		/* roll back tpd/buffer */
+		atl1c_tx_rollback(adapter, tpd, queue);
+		dev_kfree_skb_any(skb);
+	} else {
+		bool more = netdev_xmit_more();
+
+		if (__netdev_tx_sent_queue(txq, skb->len, more))
+			atl1c_tx_queue(adapter, queue);
+	}
+
+	return NETDEV_TX_OK;
+}
+
+static void atl1c_free_irq(struct atl1c_adapter *adapter)
+{
+	struct net_device *netdev = adapter->netdev;
+
+	free_irq(adapter->pdev->irq, netdev);
+
+	if (adapter->have_msi)
+		pci_disable_msi(adapter->pdev);
+}
+
+static int atl1c_request_irq(struct atl1c_adapter *adapter)
+{
+	struct pci_dev    *pdev   = adapter->pdev;
+	struct net_device *netdev = adapter->netdev;
+	int flags = 0;
+	int err = 0;
+
+	adapter->have_msi = true;
+	err = pci_enable_msi(adapter->pdev);
+	if (err) {
+		if (netif_msg_ifup(adapter))
+			dev_err(&pdev->dev,
+				"Unable to allocate MSI interrupt Error: %d\n",
+				err);
+		adapter->have_msi = false;
+	}
+
+	if (!adapter->have_msi)
+		flags |= IRQF_SHARED;
+	err = request_irq(adapter->pdev->irq, atl1c_intr, flags,
+			netdev->name, netdev);
+	if (err) {
+		if (netif_msg_ifup(adapter))
+			dev_err(&pdev->dev,
+				"Unable to allocate interrupt Error: %d\n",
+				err);
+		if (adapter->have_msi)
+			pci_disable_msi(adapter->pdev);
+		return err;
+	}
+	if (netif_msg_ifup(adapter))
+		dev_dbg(&pdev->dev, "atl1c_request_irq OK\n");
+	return err;
+}
+
+
+static void atl1c_reset_dma_ring(struct atl1c_adapter *adapter)
+{
+	int i;
+	/* release tx-pending skbs and reset tx/rx ring index */
+	for (i = 0; i < adapter->tx_queue_count; ++i)
+		atl1c_clean_tx_ring(adapter, i);
+	for (i = 0; i < adapter->rx_queue_count; ++i)
+		atl1c_clean_rx_ring(adapter, i);
+}
+
+static int atl1c_up(struct atl1c_adapter *adapter)
+{
+	struct net_device *netdev = adapter->netdev;
+	int err;
+	int i;
+
+	netif_carrier_off(netdev);
+
+	err = atl1c_configure(adapter);
+	if (unlikely(err))
+		goto err_up;
+
+	err = atl1c_request_irq(adapter);
+	if (unlikely(err))
+		goto err_up;
+
+	atl1c_check_link_status(adapter);
+	clear_bit(__AT_DOWN, &adapter->flags);
+	for (i = 0; i < adapter->tx_queue_count; ++i)
+		napi_enable(&adapter->tpd_ring[i].napi);
+	for (i = 0; i < adapter->rx_queue_count; ++i)
+		napi_enable(&adapter->rrd_ring[i].napi);
+	atl1c_irq_enable(adapter);
+	netif_start_queue(netdev);
+	return err;
+
+err_up:
+	for (i = 0; i < adapter->rx_queue_count; ++i)
+		atl1c_clean_rx_ring(adapter, i);
+	return err;
+}
+
+static void atl1c_down(struct atl1c_adapter *adapter)
+{
+	struct net_device *netdev = adapter->netdev;
+	int i;
+
+	atl1c_del_timer(adapter);
+	adapter->work_event = 0; /* clear all event */
+	/* signal that we're down so the interrupt handler does not
+	 * reschedule our watchdog timer */
+	set_bit(__AT_DOWN, &adapter->flags);
+	netif_carrier_off(netdev);
+	for (i = 0; i < adapter->tx_queue_count; ++i)
+		napi_disable(&adapter->tpd_ring[i].napi);
+	for (i = 0; i < adapter->rx_queue_count; ++i)
+		napi_disable(&adapter->rrd_ring[i].napi);
+	atl1c_irq_disable(adapter);
+	atl1c_free_irq(adapter);
+	/* disable ASPM if device inactive */
+	atl1c_disable_l0s_l1(&adapter->hw);
+	/* reset MAC to disable all RX/TX */
+	atl1c_reset_mac(&adapter->hw);
+	msleep(1);
+
+	adapter->link_speed = SPEED_0;
+	adapter->link_duplex = -1;
+	atl1c_reset_dma_ring(adapter);
+}
+
+/**
+ * atl1c_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 atl1c_open(struct net_device *netdev)
+{
+	struct atl1c_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 */
+	err = atl1c_setup_ring_resources(adapter);
+	if (unlikely(err))
+		return err;
+
+	err = atl1c_up(adapter);
+	if (unlikely(err))
+		goto err_up;
+
+	return 0;
+
+err_up:
+	atl1c_free_irq(adapter);
+	atl1c_free_ring_resources(adapter);
+	atl1c_reset_mac(&adapter->hw);
+	return err;
+}
+
+/**
+ * atl1c_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 atl1c_close(struct net_device *netdev)
+{
+	struct atl1c_adapter *adapter = netdev_priv(netdev);
+
+	WARN_ON(test_bit(__AT_RESETTING, &adapter->flags));
+	set_bit(__AT_DOWN, &adapter->flags);
+	cancel_work_sync(&adapter->common_task);
+	atl1c_down(adapter);
+	atl1c_free_ring_resources(adapter);
+	return 0;
+}
+
+static int atl1c_suspend(struct device *dev)
+{
+	struct net_device *netdev = dev_get_drvdata(dev);
+	struct atl1c_adapter *adapter = netdev_priv(netdev);
+	struct atl1c_hw *hw = &adapter->hw;
+	u32 wufc = adapter->wol;
+
+	atl1c_disable_l0s_l1(hw);
+	if (netif_running(netdev)) {
+		WARN_ON(test_bit(__AT_RESETTING, &adapter->flags));
+		atl1c_down(adapter);
+	}
+	netif_device_detach(netdev);
+
+	if (wufc)
+		if (atl1c_phy_to_ps_link(hw) != 0)
+			dev_dbg(dev, "phy power saving failed");
+
+	atl1c_power_saving(hw, wufc);
+
+	return 0;
+}
+
+#ifdef CONFIG_PM_SLEEP
+static int atl1c_resume(struct device *dev)
+{
+	struct net_device *netdev = dev_get_drvdata(dev);
+	struct atl1c_adapter *adapter = netdev_priv(netdev);
+
+	AT_WRITE_REG(&adapter->hw, REG_WOL_CTRL, 0);
+	atl1c_reset_pcie(&adapter->hw, ATL1C_PCIE_L0S_L1_DISABLE);
+
+	atl1c_phy_reset(&adapter->hw);
+	atl1c_reset_mac(&adapter->hw);
+	atl1c_phy_init(&adapter->hw);
+
+	netif_device_attach(netdev);
+	if (netif_running(netdev))
+		atl1c_up(adapter);
+
+	return 0;
+}
+#endif
+
+static void atl1c_shutdown(struct pci_dev *pdev)
+{
+	struct net_device *netdev = pci_get_drvdata(pdev);
+	struct atl1c_adapter *adapter = netdev_priv(netdev);
+
+	atl1c_suspend(&pdev->dev);
+	pci_wake_from_d3(pdev, adapter->wol);
+	pci_set_power_state(pdev, PCI_D3hot);
+}
+
+static const struct net_device_ops atl1c_netdev_ops = {
+	.ndo_open		= atl1c_open,
+	.ndo_stop		= atl1c_close,
+	.ndo_validate_addr	= eth_validate_addr,
+	.ndo_start_xmit		= atl1c_xmit_frame,
+	.ndo_set_mac_address	= atl1c_set_mac_addr,
+	.ndo_set_rx_mode	= atl1c_set_multi,
+	.ndo_change_mtu		= atl1c_change_mtu,
+	.ndo_fix_features	= atl1c_fix_features,
+	.ndo_set_features	= atl1c_set_features,
+	.ndo_eth_ioctl		= atl1c_ioctl,
+	.ndo_tx_timeout		= atl1c_tx_timeout,
+	.ndo_get_stats		= atl1c_get_stats,
+#ifdef CONFIG_NET_POLL_CONTROLLER
+	.ndo_poll_controller	= atl1c_netpoll,
+#endif
+};
+
+static int atl1c_init_netdev(struct net_device *netdev, struct pci_dev *pdev)
+{
+	SET_NETDEV_DEV(netdev, &pdev->dev);
+	pci_set_drvdata(pdev, netdev);
+
+	netdev->netdev_ops = &atl1c_netdev_ops;
+	netdev->watchdog_timeo = AT_TX_WATCHDOG;
+	netdev->min_mtu = ETH_ZLEN - (ETH_HLEN + VLAN_HLEN);
+	atl1c_set_ethtool_ops(netdev);
+
+	/* TODO: add when ready */
+	netdev->hw_features =	NETIF_F_SG		|
+				NETIF_F_HW_CSUM		|
+				NETIF_F_HW_VLAN_CTAG_RX	|
+				NETIF_F_TSO		|
+				NETIF_F_TSO6;
+	netdev->features =	netdev->hw_features	|
+				NETIF_F_HW_VLAN_CTAG_TX;
+	return 0;
+}
+
+/**
+ * atl1c_probe - Device Initialization Routine
+ * @pdev: PCI device information struct
+ * @ent: entry in atl1c_pci_tbl
+ *
+ * Returns 0 on success, negative on failure
+ *
+ * atl1c_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 atl1c_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
+{
+	struct net_device *netdev;
+	struct atl1c_adapter *adapter;
+	static int cards_found;
+	u8 __iomem *hw_addr;
+	enum atl1c_nic_type nic_type;
+	u32 queue_count = 1;
+	int err = 0;
+	int i;
+
+	/* enable device (incl. PCI PM wakeup and hotplug setup) */
+	err = pci_enable_device_mem(pdev);
+	if (err)
+		return dev_err_probe(&pdev->dev, err, "cannot enable PCI device\n");
+
+	/*
+	 * The atl1c 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, atl1c_driver_name);
+	if (err) {
+		dev_err(&pdev->dev, "cannot obtain PCI resources\n");
+		goto err_pci_reg;
+	}
+
+	pci_set_master(pdev);
+
+	hw_addr = pci_ioremap_bar(pdev, 0);
+	if (!hw_addr) {
+		err = -EIO;
+		dev_err(&pdev->dev, "cannot map device registers\n");
+		goto err_ioremap;
+	}
+
+	nic_type = atl1c_get_mac_type(pdev, hw_addr);
+	if (nic_type == athr_mt)
+		queue_count = 4;
+
+	netdev = alloc_etherdev_mq(sizeof(struct atl1c_adapter), queue_count);
+	if (netdev == NULL) {
+		err = -ENOMEM;
+		goto err_alloc_etherdev;
+	}
+
+	err = atl1c_init_netdev(netdev, pdev);
+	if (err) {
+		dev_err(&pdev->dev, "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.nic_type = nic_type;
+	adapter->msg_enable = netif_msg_init(-1, atl1c_default_msg);
+	adapter->hw.hw_addr = hw_addr;
+	adapter->tx_queue_count = queue_count;
+	adapter->rx_queue_count = queue_count;
+
+	/* init mii data */
+	adapter->mii.dev = netdev;
+	adapter->mii.mdio_read  = atl1c_mdio_read;
+	adapter->mii.mdio_write = atl1c_mdio_write;
+	adapter->mii.phy_id_mask = 0x1f;
+	adapter->mii.reg_num_mask = MDIO_CTRL_REG_MASK;
+	dev_set_threaded(netdev, true);
+	for (i = 0; i < adapter->rx_queue_count; ++i)
+		netif_napi_add(netdev, &adapter->rrd_ring[i].napi,
+			       atl1c_clean_rx);
+	for (i = 0; i < adapter->tx_queue_count; ++i)
+		netif_napi_add_tx(netdev, &adapter->tpd_ring[i].napi,
+				  atl1c_clean_tx);
+	timer_setup(&adapter->phy_config_timer, atl1c_phy_config, 0);
+	/* setup the private structure */
+	err = atl1c_sw_init(adapter);
+	if (err) {
+		dev_err(&pdev->dev, "net device private data init failed\n");
+		goto err_sw_init;
+	}
+	/* set max MTU */
+	atl1c_set_max_mtu(netdev);
+
+	atl1c_reset_pcie(&adapter->hw, ATL1C_PCIE_L0S_L1_DISABLE);
+
+	/* Init GPHY as early as possible due to power saving issue  */
+	atl1c_phy_reset(&adapter->hw);
+
+	err = atl1c_reset_mac(&adapter->hw);
+	if (err) {
+		err = -EIO;
+		goto err_reset;
+	}
+
+	/* reset the controller to
+	 * put the device in a known good starting state */
+	err = atl1c_phy_init(&adapter->hw);
+	if (err) {
+		err = -EIO;
+		goto err_reset;
+	}
+	if (atl1c_read_mac_addr(&adapter->hw)) {
+		/* got a random MAC address, set NET_ADDR_RANDOM to netdev */
+		netdev->addr_assign_type = NET_ADDR_RANDOM;
+	}
+	eth_hw_addr_set(netdev, adapter->hw.mac_addr);
+	if (netif_msg_probe(adapter))
+		dev_dbg(&pdev->dev, "mac address : %pM\n",
+			adapter->hw.mac_addr);
+
+	atl1c_hw_set_mac_addr(&adapter->hw, adapter->hw.mac_addr);
+	INIT_WORK(&adapter->common_task, atl1c_common_task);
+	adapter->work_event = 0;
+	err = register_netdev(netdev);
+	if (err) {
+		dev_err(&pdev->dev, "register netdevice failed\n");
+		goto err_register;
+	}
+
+	cards_found++;
+	return 0;
+
+err_reset:
+err_register:
+err_sw_init:
+err_init_netdev:
+	free_netdev(netdev);
+err_alloc_etherdev:
+	iounmap(hw_addr);
+err_ioremap:
+	pci_release_regions(pdev);
+err_pci_reg:
+err_dma:
+	pci_disable_device(pdev);
+	return err;
+}
+
+/**
+ * atl1c_remove - Device Removal Routine
+ * @pdev: PCI device information struct
+ *
+ * atl1c_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 atl1c_remove(struct pci_dev *pdev)
+{
+	struct net_device *netdev = pci_get_drvdata(pdev);
+	struct atl1c_adapter *adapter = netdev_priv(netdev);
+
+	unregister_netdev(netdev);
+	/* restore permanent address */
+	atl1c_hw_set_mac_addr(&adapter->hw, adapter->hw.perm_mac_addr);
+	atl1c_phy_disable(&adapter->hw);
+
+	iounmap(adapter->hw.hw_addr);
+
+	pci_release_regions(pdev);
+	pci_disable_device(pdev);
+	free_netdev(netdev);
+}
+
+/**
+ * atl1c_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 atl1c_io_error_detected(struct pci_dev *pdev,
+						pci_channel_state_t state)
+{
+	struct net_device *netdev = pci_get_drvdata(pdev);
+	struct atl1c_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))
+		atl1c_down(adapter);
+
+	pci_disable_device(pdev);
+
+	/* Request a slot reset. */
+	return PCI_ERS_RESULT_NEED_RESET;
+}
+
+/**
+ * atl1c_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 atl1c_io_slot_reset(struct pci_dev *pdev)
+{
+	struct net_device *netdev = pci_get_drvdata(pdev);
+	struct atl1c_adapter *adapter = netdev_priv(netdev);
+
+	if (pci_enable_device(pdev)) {
+		if (netif_msg_hw(adapter))
+			dev_err(&pdev->dev,
+				"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);
+
+	atl1c_reset_mac(&adapter->hw);
+
+	return PCI_ERS_RESULT_RECOVERED;
+}
+
+/**
+ * atl1c_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 atl1c_resume routine.
+ */
+static void atl1c_io_resume(struct pci_dev *pdev)
+{
+	struct net_device *netdev = pci_get_drvdata(pdev);
+	struct atl1c_adapter *adapter = netdev_priv(netdev);
+
+	if (netif_running(netdev)) {
+		if (atl1c_up(adapter)) {
+			if (netif_msg_hw(adapter))
+				dev_err(&pdev->dev,
+					"Cannot bring device back up after reset\n");
+			return;
+		}
+	}
+
+	netif_device_attach(netdev);
+}
+
+static const struct pci_error_handlers atl1c_err_handler = {
+	.error_detected = atl1c_io_error_detected,
+	.slot_reset = atl1c_io_slot_reset,
+	.resume = atl1c_io_resume,
+};
+
+static SIMPLE_DEV_PM_OPS(atl1c_pm_ops, atl1c_suspend, atl1c_resume);
+
+static struct pci_driver atl1c_driver = {
+	.name     = atl1c_driver_name,
+	.id_table = atl1c_pci_tbl,
+	.probe    = atl1c_probe,
+	.remove   = atl1c_remove,
+	.shutdown = atl1c_shutdown,
+	.err_handler = &atl1c_err_handler,
+	.driver.pm = &atl1c_pm_ops,
+};
+
+module_pci_driver(atl1c_driver);