/*******************************************************************************

  Intel(R) Gigabit Ethernet Linux driver
  Copyright(c) 2007-2013 Intel Corporation.

  This program is free software; you can redistribute it and/or modify it
  under the terms and conditions of the GNU General Public License,
  version 2, as published by the Free Software Foundation.

  This program is distributed in the hope it will be useful, but WITHOUT
  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  more details.

  You should have received a copy of the GNU General Public License along with
  this program; if not, write to the Free Software Foundation, Inc.,
  51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.

  The full GNU General Public License is included in this distribution in
  the file called "COPYING".

  Contact Information:
  e1000-devel Mailing List <e1000-devel@lists.sourceforge.net>
  Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497

*******************************************************************************/

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#include <linux/module.h>
#include <linux/types.h>
#include <linux/init.h>
#include <linux/bitops.h>
#include <linux/vmalloc.h>
#include <linux/pagemap.h>
#include <linux/netdevice.h>
#include <linux/ipv6.h>
#include <linux/slab.h>
#include <net/checksum.h>
#include <net/ip6_checksum.h>
#include <linux/net_tstamp.h>
#include <linux/mii.h>
#include <linux/ethtool.h>
#include <linux/if.h>
#include <linux/if_vlan.h>
#include <linux/pci.h>
#include <linux/pci-aspm.h>
#include <linux/delay.h>
#include <linux/interrupt.h>
#include <linux/ip.h>
#include <linux/tcp.h>
#include <linux/sctp.h>
#include <linux/if_ether.h>
#include <linux/aer.h>
#include <linux/prefetch.h>
#include <linux/pm_runtime.h>
#ifdef CONFIG_IGB_DCA
#include <linux/dca.h>
#endif
#include <linux/i2c.h>
#include "igb.h"

#define MAJ 5
#define MIN 0
#define BUILD 3
#define DRV_VERSION __stringify(MAJ) "." __stringify(MIN) "." \
__stringify(BUILD) "-k"
char igb_driver_name[] = "igb";
char igb_driver_version[] = DRV_VERSION;
static const char igb_driver_string[] =
                                "Intel(R) Gigabit Ethernet Network Driver";
static const char igb_copyright[] =
                                "Copyright (c) 2007-2013 Intel Corporation.";

static const struct e1000_info *igb_info_tbl[] = {
        [board_82575] = &e1000_82575_info,
};

static DEFINE_PCI_DEVICE_TABLE(igb_pci_tbl) = {
        { PCI_VDEVICE(INTEL, E1000_DEV_ID_I354_BACKPLANE_1GBPS) },
        { PCI_VDEVICE(INTEL, E1000_DEV_ID_I354_SGMII) },
        { PCI_VDEVICE(INTEL, E1000_DEV_ID_I354_BACKPLANE_2_5GBPS) },
        { PCI_VDEVICE(INTEL, E1000_DEV_ID_I211_COPPER), board_82575 },
        { PCI_VDEVICE(INTEL, E1000_DEV_ID_I210_COPPER), board_82575 },
        { PCI_VDEVICE(INTEL, E1000_DEV_ID_I210_FIBER), board_82575 },
        { PCI_VDEVICE(INTEL, E1000_DEV_ID_I210_SERDES), board_82575 },
        { PCI_VDEVICE(INTEL, E1000_DEV_ID_I210_SGMII), board_82575 },
        { PCI_VDEVICE(INTEL, E1000_DEV_ID_I350_COPPER), board_82575 },
        { PCI_VDEVICE(INTEL, E1000_DEV_ID_I350_FIBER), board_82575 },
        { PCI_VDEVICE(INTEL, E1000_DEV_ID_I350_SERDES), board_82575 },
        { PCI_VDEVICE(INTEL, E1000_DEV_ID_I350_SGMII), board_82575 },
        { PCI_VDEVICE(INTEL, E1000_DEV_ID_82580_COPPER), board_82575 },
        { PCI_VDEVICE(INTEL, E1000_DEV_ID_82580_FIBER), board_82575 },
        { PCI_VDEVICE(INTEL, E1000_DEV_ID_82580_QUAD_FIBER), board_82575 },
        { PCI_VDEVICE(INTEL, E1000_DEV_ID_82580_SERDES), board_82575 },
        { PCI_VDEVICE(INTEL, E1000_DEV_ID_82580_SGMII), board_82575 },
        { PCI_VDEVICE(INTEL, E1000_DEV_ID_82580_COPPER_DUAL), board_82575 },
        { PCI_VDEVICE(INTEL, E1000_DEV_ID_DH89XXCC_SGMII), board_82575 },
        { PCI_VDEVICE(INTEL, E1000_DEV_ID_DH89XXCC_SERDES), board_82575 },
        { PCI_VDEVICE(INTEL, E1000_DEV_ID_DH89XXCC_BACKPLANE), board_82575 },
        { PCI_VDEVICE(INTEL, E1000_DEV_ID_DH89XXCC_SFP), board_82575 },
        { PCI_VDEVICE(INTEL, E1000_DEV_ID_82576), board_82575 },
        { PCI_VDEVICE(INTEL, E1000_DEV_ID_82576_NS), board_82575 },
        { PCI_VDEVICE(INTEL, E1000_DEV_ID_82576_NS_SERDES), board_82575 },
        { PCI_VDEVICE(INTEL, E1000_DEV_ID_82576_FIBER), board_82575 },
        { PCI_VDEVICE(INTEL, E1000_DEV_ID_82576_SERDES), board_82575 },
        { PCI_VDEVICE(INTEL, E1000_DEV_ID_82576_SERDES_QUAD), board_82575 },
        { PCI_VDEVICE(INTEL, E1000_DEV_ID_82576_QUAD_COPPER_ET2), board_82575 },
        { PCI_VDEVICE(INTEL, E1000_DEV_ID_82576_QUAD_COPPER), board_82575 },
        { PCI_VDEVICE(INTEL, E1000_DEV_ID_82575EB_COPPER), board_82575 },
        { PCI_VDEVICE(INTEL, E1000_DEV_ID_82575EB_FIBER_SERDES), board_82575 },
        { PCI_VDEVICE(INTEL, E1000_DEV_ID_82575GB_QUAD_COPPER), board_82575 },
        /* required last entry */
        {0, }
};

MODULE_DEVICE_TABLE(pci, igb_pci_tbl);

void igb_reset(struct igb_adapter *);
static int igb_setup_all_tx_resources(struct igb_adapter *);
static int igb_setup_all_rx_resources(struct igb_adapter *);
static void igb_free_all_tx_resources(struct igb_adapter *);
static void igb_free_all_rx_resources(struct igb_adapter *);
static void igb_setup_mrqc(struct igb_adapter *);
static int igb_probe(struct pci_dev *, const struct pci_device_id *);
static void igb_remove(struct pci_dev *pdev);
static int igb_sw_init(struct igb_adapter *);
static int igb_open(struct net_device *);
static int igb_close(struct net_device *);
static void igb_configure(struct igb_adapter *);
static void igb_configure_tx(struct igb_adapter *);
static void igb_configure_rx(struct igb_adapter *);
static void igb_clean_all_tx_rings(struct igb_adapter *);
static void igb_clean_all_rx_rings(struct igb_adapter *);
static void igb_clean_tx_ring(struct igb_ring *);
static void igb_clean_rx_ring(struct igb_ring *);
static void igb_set_rx_mode(struct net_device *);
static void igb_update_phy_info(unsigned long);
static void igb_watchdog(unsigned long);
static void igb_watchdog_task(struct work_struct *);
static netdev_tx_t igb_xmit_frame(struct sk_buff *skb, struct net_device *);
static struct rtnl_link_stats64 *igb_get_stats64(struct net_device *dev,
                                                 struct rtnl_link_stats64 *stats);
static int igb_change_mtu(struct net_device *, int);
static int igb_set_mac(struct net_device *, void *);
static void igb_set_uta(struct igb_adapter *adapter);
static irqreturn_t igb_intr(int irq, void *);
static irqreturn_t igb_intr_msi(int irq, void *);
static irqreturn_t igb_msix_other(int irq, void *);
static irqreturn_t igb_msix_ring(int irq, void *);
#ifdef CONFIG_IGB_DCA
static void igb_update_dca(struct igb_q_vector *);
static void igb_setup_dca(struct igb_adapter *);
#endif /* CONFIG_IGB_DCA */
static int igb_poll(struct napi_struct *, int);
static bool igb_clean_tx_irq(struct igb_q_vector *);
static bool igb_clean_rx_irq(struct igb_q_vector *, int);
static int igb_ioctl(struct net_device *, struct ifreq *, int cmd);
static void igb_tx_timeout(struct net_device *);
static void igb_reset_task(struct work_struct *);
static void igb_vlan_mode(struct net_device *netdev, netdev_features_t features);
static int igb_vlan_rx_add_vid(struct net_device *, __be16, u16);
static int igb_vlan_rx_kill_vid(struct net_device *, __be16, u16);
static void igb_restore_vlan(struct igb_adapter *);
static void igb_rar_set_qsel(struct igb_adapter *, u8 *, u32 , u8);
static void igb_ping_all_vfs(struct igb_adapter *);
static void igb_msg_task(struct igb_adapter *);
static void igb_vmm_control(struct igb_adapter *);
static int igb_set_vf_mac(struct igb_adapter *, int, unsigned char *);
static void igb_restore_vf_multicasts(struct igb_adapter *adapter);
static int igb_ndo_set_vf_mac(struct net_device *netdev, int vf, u8 *mac);
static int igb_ndo_set_vf_vlan(struct net_device *netdev,
                               int vf, u16 vlan, u8 qos);
static int igb_ndo_set_vf_bw(struct net_device *netdev, int vf, int tx_rate);
static int igb_ndo_set_vf_spoofchk(struct net_device *netdev, int vf,
                                   bool setting);
static int igb_ndo_get_vf_config(struct net_device *netdev, int vf,
                                 struct ifla_vf_info *ivi);
static void igb_check_vf_rate_limit(struct igb_adapter *);

#ifdef CONFIG_PCI_IOV
static int igb_vf_configure(struct igb_adapter *adapter, int vf);
#endif

#ifdef CONFIG_PM
#ifdef CONFIG_PM_SLEEP
static int igb_suspend(struct device *);
#endif
static int igb_resume(struct device *);
#ifdef CONFIG_PM_RUNTIME
static int igb_runtime_suspend(struct device *dev);
static int igb_runtime_resume(struct device *dev);
static int igb_runtime_idle(struct device *dev);
#endif
static const struct dev_pm_ops igb_pm_ops = {
        SET_SYSTEM_SLEEP_PM_OPS(igb_suspend, igb_resume)
        SET_RUNTIME_PM_OPS(igb_runtime_suspend, igb_runtime_resume,
                        igb_runtime_idle)
};
#endif
static void igb_shutdown(struct pci_dev *);
static int igb_pci_sriov_configure(struct pci_dev *dev, int num_vfs);
#ifdef CONFIG_IGB_DCA
static int igb_notify_dca(struct notifier_block *, unsigned long, void *);
static struct notifier_block dca_notifier = {
        .notifier_call  = igb_notify_dca,
        .next           = NULL,
        .priority       = 0
};
#endif
#ifdef CONFIG_NET_POLL_CONTROLLER
/* for netdump / net console */
static void igb_netpoll(struct net_device *);
#endif
#ifdef CONFIG_PCI_IOV
static unsigned int max_vfs = 0;
module_param(max_vfs, uint, 0);
MODULE_PARM_DESC(max_vfs, "Maximum number of virtual functions to allocate "
                 "per physical function");
#endif /* CONFIG_PCI_IOV */

static pci_ers_result_t igb_io_error_detected(struct pci_dev *,
                     pci_channel_state_t);
static pci_ers_result_t igb_io_slot_reset(struct pci_dev *);
static void igb_io_resume(struct pci_dev *);

static const struct pci_error_handlers igb_err_handler = {
        .error_detected = igb_io_error_detected,
        .slot_reset = igb_io_slot_reset,
        .resume = igb_io_resume,
};

static void igb_init_dmac(struct igb_adapter *adapter, u32 pba);

static struct pci_driver igb_driver = {
        .name     = igb_driver_name,
        .id_table = igb_pci_tbl,
        .probe    = igb_probe,
        .remove   = igb_remove,
#ifdef CONFIG_PM
        .driver.pm = &igb_pm_ops,
#endif
        .shutdown = igb_shutdown,
        .sriov_configure = igb_pci_sriov_configure,
        .err_handler = &igb_err_handler
};

MODULE_AUTHOR("Intel Corporation, <e1000-devel@lists.sourceforge.net>");
MODULE_DESCRIPTION("Intel(R) Gigabit Ethernet Network Driver");
MODULE_LICENSE("GPL");
MODULE_VERSION(DRV_VERSION);

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

struct igb_reg_info {
        u32 ofs;
        char *name;
};

static const struct igb_reg_info igb_reg_info_tbl[] = {

        /* General Registers */
        {E1000_CTRL, "CTRL"},
        {E1000_STATUS, "STATUS"},
        {E1000_CTRL_EXT, "CTRL_EXT"},

        /* Interrupt Registers */
        {E1000_ICR, "ICR"},

        /* RX Registers */
        {E1000_RCTL, "RCTL"},
        {E1000_RDLEN(0), "RDLEN"},
        {E1000_RDH(0), "RDH"},
        {E1000_RDT(0), "RDT"},
        {E1000_RXDCTL(0), "RXDCTL"},
        {E1000_RDBAL(0), "RDBAL"},
        {E1000_RDBAH(0), "RDBAH"},

        /* TX Registers */
        {E1000_TCTL, "TCTL"},
        {E1000_TDBAL(0), "TDBAL"},
        {E1000_TDBAH(0), "TDBAH"},
        {E1000_TDLEN(0), "TDLEN"},
        {E1000_TDH(0), "TDH"},
        {E1000_TDT(0), "TDT"},
        {E1000_TXDCTL(0), "TXDCTL"},
        {E1000_TDFH, "TDFH"},
        {E1000_TDFT, "TDFT"},
        {E1000_TDFHS, "TDFHS"},
        {E1000_TDFPC, "TDFPC"},

        /* List Terminator */
        {}
};

/* igb_regdump - register printout routine */
static void igb_regdump(struct e1000_hw *hw, struct igb_reg_info *reginfo)
{
        int n = 0;
        char rname[16];
        u32 regs[8];

        switch (reginfo->ofs) {
        case E1000_RDLEN(0):
                for (n = 0; n < 4; n++)
                        regs[n] = rd32(E1000_RDLEN(n));
                break;
        case E1000_RDH(0):
                for (n = 0; n < 4; n++)
                        regs[n] = rd32(E1000_RDH(n));
                break;
        case E1000_RDT(0):
                for (n = 0; n < 4; n++)
                        regs[n] = rd32(E1000_RDT(n));
                break;
        case E1000_RXDCTL(0):
                for (n = 0; n < 4; n++)
                        regs[n] = rd32(E1000_RXDCTL(n));
                break;
        case E1000_RDBAL(0):
                for (n = 0; n < 4; n++)
                        regs[n] = rd32(E1000_RDBAL(n));
                break;
        case E1000_RDBAH(0):
                for (n = 0; n < 4; n++)
                        regs[n] = rd32(E1000_RDBAH(n));
                break;
        case E1000_TDBAL(0):
                for (n = 0; n < 4; n++)
                        regs[n] = rd32(E1000_RDBAL(n));
                break;
        case E1000_TDBAH(0):
                for (n = 0; n < 4; n++)
                        regs[n] = rd32(E1000_TDBAH(n));
                break;
        case E1000_TDLEN(0):
                for (n = 0; n < 4; n++)
                        regs[n] = rd32(E1000_TDLEN(n));
                break;
        case E1000_TDH(0):
                for (n = 0; n < 4; n++)
                        regs[n] = rd32(E1000_TDH(n));
                break;
        case E1000_TDT(0):
                for (n = 0; n < 4; n++)
                        regs[n] = rd32(E1000_TDT(n));
                break;
        case E1000_TXDCTL(0):
                for (n = 0; n < 4; n++)
                        regs[n] = rd32(E1000_TXDCTL(n));
                break;
        default:
                pr_info("%-15s %08x\n", reginfo->name, rd32(reginfo->ofs));
                return;
        }

        snprintf(rname, 16, "%s%s", reginfo->name, "[0-3]");
        pr_info("%-15s %08x %08x %08x %08x\n", rname, regs[0], regs[1],
                regs[2], regs[3]);
}

/* igb_dump - Print registers, Tx-rings and Rx-rings */
static void igb_dump(struct igb_adapter *adapter)
{
        struct net_device *netdev = adapter->netdev;
        struct e1000_hw *hw = &adapter->hw;
        struct igb_reg_info *reginfo;
        struct igb_ring *tx_ring;
        union e1000_adv_tx_desc *tx_desc;
        struct my_u0 { u64 a; u64 b; } *u0;
        struct igb_ring *rx_ring;
        union e1000_adv_rx_desc *rx_desc;
        u32 staterr;
        u16 i, n;

        if (!netif_msg_hw(adapter))
                return;

        /* Print netdevice Info */
        if (netdev) {
                dev_info(&adapter->pdev->dev, "Net device Info\n");
                pr_info("Device Name     state            trans_start      "
                        "last_rx\n");
                pr_info("%-15s %016lX %016lX %016lX\n", netdev->name,
                        netdev->state, netdev->trans_start, netdev->last_rx);
        }

        /* Print Registers */
        dev_info(&adapter->pdev->dev, "Register Dump\n");
        pr_info(" Register Name   Value\n");
        for (reginfo = (struct igb_reg_info *)igb_reg_info_tbl;
             reginfo->name; reginfo++) {
                igb_regdump(hw, reginfo);
        }

        /* Print TX Ring Summary */
        if (!netdev || !netif_running(netdev))
                goto exit;

        dev_info(&adapter->pdev->dev, "TX Rings Summary\n");
        pr_info("Queue [NTU] [NTC] [bi(ntc)->dma  ] leng ntw timestamp\n");
        for (n = 0; n < adapter->num_tx_queues; n++) {
                struct igb_tx_buffer *buffer_info;
                tx_ring = adapter->tx_ring[n];
                buffer_info = &tx_ring->tx_buffer_info[tx_ring->next_to_clean];
                pr_info(" %5d %5X %5X %016llX %04X %p %016llX\n",
                        n, tx_ring->next_to_use, tx_ring->next_to_clean,
                        (u64)dma_unmap_addr(buffer_info, dma),
                        dma_unmap_len(buffer_info, len),
                        buffer_info->next_to_watch,
                        (u64)buffer_info->time_stamp);
        }

        /* Print TX Rings */
        if (!netif_msg_tx_done(adapter))
                goto rx_ring_summary;

        dev_info(&adapter->pdev->dev, "TX Rings Dump\n");

        /* Transmit Descriptor Formats
         *
         * Advanced Transmit Descriptor
         *   +--------------------------------------------------------------+
         * 0 |         Buffer Address [63:0]                                |
         *   +--------------------------------------------------------------+
         * 8 | PAYLEN  | PORTS  |CC|IDX | STA | DCMD  |DTYP|MAC|RSV| DTALEN |
         *   +--------------------------------------------------------------+
         *   63      46 45    40 39 38 36 35 32 31   24             15       0
         */

        for (n = 0; n < adapter->num_tx_queues; n++) {
                tx_ring = adapter->tx_ring[n];
                pr_info("------------------------------------\n");
                pr_info("TX QUEUE INDEX = %d\n", tx_ring->queue_index);
                pr_info("------------------------------------\n");
                pr_info("T [desc]     [address 63:0  ] [PlPOCIStDDM Ln] "
                        "[bi->dma       ] leng  ntw timestamp        "
                        "bi->skb\n");

                for (i = 0; tx_ring->desc && (i < tx_ring->count); i++) {
                        const char *next_desc;
                        struct igb_tx_buffer *buffer_info;
                        tx_desc = IGB_TX_DESC(tx_ring, i);
                        buffer_info = &tx_ring->tx_buffer_info[i];
                        u0 = (struct my_u0 *)tx_desc;
                        if (i == tx_ring->next_to_use &&
                            i == tx_ring->next_to_clean)
                                next_desc = " NTC/U";
                        else if (i == tx_ring->next_to_use)
                                next_desc = " NTU";
                        else if (i == tx_ring->next_to_clean)
                                next_desc = " NTC";
                        else
                                next_desc = "";

                        pr_info("T [0x%03X]    %016llX %016llX %016llX"
                                " %04X  %p %016llX %p%s\n", i,
                                le64_to_cpu(u0->a),
                                le64_to_cpu(u0->b),
                                (u64)dma_unmap_addr(buffer_info, dma),
                                dma_unmap_len(buffer_info, len),
                                buffer_info->next_to_watch,
                                (u64)buffer_info->time_stamp,
                                buffer_info->skb, next_desc);

                        if (netif_msg_pktdata(adapter) && buffer_info->skb)
                                print_hex_dump(KERN_INFO, "",
                                        DUMP_PREFIX_ADDRESS,
                                        16, 1, buffer_info->skb->data,
                                        dma_unmap_len(buffer_info, len),
                                        true);
                }
        }

        /* Print RX Rings Summary */
rx_ring_summary:
        dev_info(&adapter->pdev->dev, "RX Rings Summary\n");
        pr_info("Queue [NTU] [NTC]\n");
        for (n = 0; n < adapter->num_rx_queues; n++) {
                rx_ring = adapter->rx_ring[n];
                pr_info(" %5d %5X %5X\n",
                        n, rx_ring->next_to_use, rx_ring->next_to_clean);
        }

        /* Print RX Rings */
        if (!netif_msg_rx_status(adapter))
                goto exit;

        dev_info(&adapter->pdev->dev, "RX Rings Dump\n");

        /* Advanced Receive Descriptor (Read) Format
         *    63                                           1        0
         *    +-----------------------------------------------------+
         *  0 |       Packet Buffer Address [63:1]           |A0/NSE|
         *    +----------------------------------------------+------+
         *  8 |       Header Buffer Address [63:1]           |  DD  |
         *    +-----------------------------------------------------+
         *
         *
         * Advanced Receive Descriptor (Write-Back) Format
         *
         *   63       48 47    32 31  30      21 20 17 16   4 3     0
         *   +------------------------------------------------------+
         * 0 | Packet     IP     |SPH| HDR_LEN   | RSV|Packet|  RSS |
         *   | Checksum   Ident  |   |           |    | Type | Type |
         *   +------------------------------------------------------+
         * 8 | VLAN Tag | Length | Extended Error | Extended Status |
         *   +------------------------------------------------------+
         *   63       48 47    32 31            20 19               0
         */

        for (n = 0; n < adapter->num_rx_queues; n++) {
                rx_ring = adapter->rx_ring[n];
                pr_info("------------------------------------\n");
                pr_info("RX QUEUE INDEX = %d\n", rx_ring->queue_index);
                pr_info("------------------------------------\n");
                pr_info("R  [desc]      [ PktBuf     A0] [  HeadBuf   DD] "
                        "[bi->dma       ] [bi->skb] <-- Adv Rx Read format\n");
                pr_info("RWB[desc]      [PcsmIpSHl PtRs] [vl er S cks ln] -----"
                        "----------- [bi->skb] <-- Adv Rx Write-Back format\n");

                for (i = 0; i < rx_ring->count; i++) {
                        const char *next_desc;
                        struct igb_rx_buffer *buffer_info;
                        buffer_info = &rx_ring->rx_buffer_info[i];
                        rx_desc = IGB_RX_DESC(rx_ring, i);
                        u0 = (struct my_u0 *)rx_desc;
                        staterr = le32_to_cpu(rx_desc->wb.upper.status_error);

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

                        if (staterr & E1000_RXD_STAT_DD) {
                                /* Descriptor Done */
                                pr_info("%s[0x%03X]     %016llX %016llX ---------------- %s\n",
                                        "RWB", i,
                                        le64_to_cpu(u0->a),
                                        le64_to_cpu(u0->b),
                                        next_desc);
                        } else {
                                pr_info("%s[0x%03X]     %016llX %016llX %016llX %s\n",
                                        "R  ", i,
                                        le64_to_cpu(u0->a),
                                        le64_to_cpu(u0->b),
                                        (u64)buffer_info->dma,
                                        next_desc);

                                if (netif_msg_pktdata(adapter) &&
                                    buffer_info->dma && buffer_info->page) {
                                        print_hex_dump(KERN_INFO, "",
                                          DUMP_PREFIX_ADDRESS,
                                          16, 1,
                                          page_address(buffer_info->page) +
                                                      buffer_info->page_offset,
                                          IGB_RX_BUFSZ, true);
                                }
                        }
                }
        }

exit:
        return;
}

/**
 *  igb_get_i2c_data - Reads the I2C SDA data bit
 *  @hw: pointer to hardware structure
 *  @i2cctl: Current value of I2CCTL register
 *
 *  Returns the I2C data bit value
 **/
static int igb_get_i2c_data(void *data)
{
        struct igb_adapter *adapter = (struct igb_adapter *)data;
        struct e1000_hw *hw = &adapter->hw;
        s32 i2cctl = rd32(E1000_I2CPARAMS);

        return ((i2cctl & E1000_I2C_DATA_IN) != 0);
}

/**
 *  igb_set_i2c_data - Sets the I2C data bit
 *  @data: pointer to hardware structure
 *  @state: I2C data value (0 or 1) to set
 *
 *  Sets the I2C data bit
 **/
static void igb_set_i2c_data(void *data, int state)
{
        struct igb_adapter *adapter = (struct igb_adapter *)data;
        struct e1000_hw *hw = &adapter->hw;
        s32 i2cctl = rd32(E1000_I2CPARAMS);

        if (state)
                i2cctl |= E1000_I2C_DATA_OUT;
        else
                i2cctl &= ~E1000_I2C_DATA_OUT;

        i2cctl &= ~E1000_I2C_DATA_OE_N;
        i2cctl |= E1000_I2C_CLK_OE_N;
        wr32(E1000_I2CPARAMS, i2cctl);
        wrfl();

}

/**
 *  igb_set_i2c_clk - Sets the I2C SCL clock
 *  @data: pointer to hardware structure
 *  @state: state to set clock
 *
 *  Sets the I2C clock line to state
 **/
static void igb_set_i2c_clk(void *data, int state)
{
        struct igb_adapter *adapter = (struct igb_adapter *)data;
        struct e1000_hw *hw = &adapter->hw;
        s32 i2cctl = rd32(E1000_I2CPARAMS);

        if (state) {
                i2cctl |= E1000_I2C_CLK_OUT;
                i2cctl &= ~E1000_I2C_CLK_OE_N;
        } else {
                i2cctl &= ~E1000_I2C_CLK_OUT;
                i2cctl &= ~E1000_I2C_CLK_OE_N;
        }
        wr32(E1000_I2CPARAMS, i2cctl);
        wrfl();
}

/**
 *  igb_get_i2c_clk - Gets the I2C SCL clock state
 *  @data: pointer to hardware structure
 *
 *  Gets the I2C clock state
 **/
static int igb_get_i2c_clk(void *data)
{
        struct igb_adapter *adapter = (struct igb_adapter *)data;
        struct e1000_hw *hw = &adapter->hw;
        s32 i2cctl = rd32(E1000_I2CPARAMS);

        return ((i2cctl & E1000_I2C_CLK_IN) != 0);
}

static const struct i2c_algo_bit_data igb_i2c_algo = {
        .setsda         = igb_set_i2c_data,
        .setscl         = igb_set_i2c_clk,
        .getsda         = igb_get_i2c_data,
        .getscl         = igb_get_i2c_clk,
        .udelay         = 5,
        .timeout        = 20,
};

/**
 *  igb_get_hw_dev - return device
 *  @hw: pointer to hardware structure
 *
 *  used by hardware layer to print debugging information
 **/
struct net_device *igb_get_hw_dev(struct e1000_hw *hw)
{
        struct igb_adapter *adapter = hw->back;
        return adapter->netdev;
}

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

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

#ifdef CONFIG_IGB_DCA
        dca_register_notify(&dca_notifier);
#endif
        ret = pci_register_driver(&igb_driver);
        return ret;
}

module_init(igb_init_module);

/**
 *  igb_exit_module - Driver Exit Cleanup Routine
 *
 *  igb_exit_module is called just before the driver is removed
 *  from memory.
 **/
static void __exit igb_exit_module(void)
{
#ifdef CONFIG_IGB_DCA
        dca_unregister_notify(&dca_notifier);
#endif
        pci_unregister_driver(&igb_driver);
}

module_exit(igb_exit_module);

#define Q_IDX_82576(i) (((i & 0x1) << 3) + (i >> 1))
/**
 *  igb_cache_ring_register - Descriptor ring to register mapping
 *  @adapter: board private structure to initialize
 *
 *  Once we know the feature-set enabled for the device, we'll cache
 *  the register offset the descriptor ring is assigned to.
 **/
static void igb_cache_ring_register(struct igb_adapter *adapter)
{
        int i = 0, j = 0;
        u32 rbase_offset = adapter->vfs_allocated_count;

        switch (adapter->hw.mac.type) {
        case e1000_82576:
                /* The queues are allocated for virtualization such that VF 0
                 * is allocated queues 0 and 8, VF 1 queues 1 and 9, etc.
                 * In order to avoid collision we start at the first free queue
                 * and continue consuming queues in the same sequence
                 */
                if (adapter->vfs_allocated_count) {
                        for (; i < adapter->rss_queues; i++)
                                adapter->rx_ring[i]->reg_idx = rbase_offset +
                                                               Q_IDX_82576(i);
                }
        case e1000_82575:
        case e1000_82580:
        case e1000_i350:
        case e1000_i354:
        case e1000_i210:
        case e1000_i211:
        default:
                for (; i < adapter->num_rx_queues; i++)
                        adapter->rx_ring[i]->reg_idx = rbase_offset + i;
                for (; j < adapter->num_tx_queues; j++)
                        adapter->tx_ring[j]->reg_idx = rbase_offset + j;
                break;
        }
}

/**
 *  igb_write_ivar - configure ivar for given MSI-X vector
 *  @hw: pointer to the HW structure
 *  @msix_vector: vector number we are allocating to a given ring
 *  @index: row index of IVAR register to write within IVAR table
 *  @offset: column offset of in IVAR, should be multiple of 8
 *
 *  This function is intended to handle the writing of the IVAR register
 *  for adapters 82576 and newer.  The IVAR table consists of 2 columns,
 *  each containing an cause allocation for an Rx and Tx ring, and a
 *  variable number of rows depending on the number of queues supported.
 **/
static void igb_write_ivar(struct e1000_hw *hw, int msix_vector,
                           int index, int offset)
{
        u32 ivar = array_rd32(E1000_IVAR0, index);

        /* clear any bits that are currently set */
        ivar &= ~((u32)0xFF << offset);

        /* write vector and valid bit */
        ivar |= (msix_vector | E1000_IVAR_VALID) << offset;

        array_wr32(E1000_IVAR0, index, ivar);
}

#define IGB_N0_QUEUE -1
static void igb_assign_vector(struct igb_q_vector *q_vector, int msix_vector)
{
        struct igb_adapter *adapter = q_vector->adapter;
        struct e1000_hw *hw = &adapter->hw;
        int rx_queue = IGB_N0_QUEUE;
        int tx_queue = IGB_N0_QUEUE;
        u32 msixbm = 0;

        if (q_vector->rx.ring)
                rx_queue = q_vector->rx.ring->reg_idx;
        if (q_vector->tx.ring)
                tx_queue = q_vector->tx.ring->reg_idx;

        switch (hw->mac.type) {
        case e1000_82575:
                /* The 82575 assigns vectors using a bitmask, which matches the
                 * bitmask for the EICR/EIMS/EIMC registers.  To assign one
                 * or more queues to a vector, we write the appropriate bits
                 * into the MSIXBM register for that vector.
                 */
                if (rx_queue > IGB_N0_QUEUE)
                        msixbm = E1000_EICR_RX_QUEUE0 << rx_queue;
                if (tx_queue > IGB_N0_QUEUE)
                        msixbm |= E1000_EICR_TX_QUEUE0 << tx_queue;
                if (!adapter->msix_entries && msix_vector == 0)
                        msixbm |= E1000_EIMS_OTHER;
                array_wr32(E1000_MSIXBM(0), msix_vector, msixbm);
                q_vector->eims_value = msixbm;
                break;
        case e1000_82576:
                /* 82576 uses a table that essentially consists of 2 columns
                 * with 8 rows.  The ordering is column-major so we use the
                 * lower 3 bits as the row index, and the 4th bit as the
                 * column offset.
                 */
                if (rx_queue > IGB_N0_QUEUE)
                        igb_write_ivar(hw, msix_vector,
                                       rx_queue & 0x7,
                                       (rx_queue & 0x8) << 1);
                if (tx_queue > IGB_N0_QUEUE)
                        igb_write_ivar(hw, msix_vector,
                                       tx_queue & 0x7,
                                       ((tx_queue & 0x8) << 1) + 8);
                q_vector->eims_value = 1 << msix_vector;
                break;
        case e1000_82580:
        case e1000_i350:
        case e1000_i354:
        case e1000_i210:
        case e1000_i211:
                /* On 82580 and newer adapters the scheme is similar to 82576
                 * however instead of ordering column-major we have things
                 * ordered row-major.  So we traverse the table by using
                 * bit 0 as the column offset, and the remaining bits as the
                 * row index.
                 */
                if (rx_queue > IGB_N0_QUEUE)
                        igb_write_ivar(hw, msix_vector,
                                       rx_queue >> 1,
                                       (rx_queue & 0x1) << 4);
                if (tx_queue > IGB_N0_QUEUE)
                        igb_write_ivar(hw, msix_vector,
                                       tx_queue >> 1,
                                       ((tx_queue & 0x1) << 4) + 8);
                q_vector->eims_value = 1 << msix_vector;
                break;
        default:
                BUG();
                break;
        }

        /* add q_vector eims value to global eims_enable_mask */
        adapter->eims_enable_mask |= q_vector->eims_value;

        /* configure q_vector to set itr on first interrupt */
        q_vector->set_itr = 1;
}

/**
 *  igb_configure_msix - Configure MSI-X hardware
 *  @adapter: board private structure to initialize
 *
 *  igb_configure_msix sets up the hardware to properly
 *  generate MSI-X interrupts.
 **/
static void igb_configure_msix(struct igb_adapter *adapter)
{
        u32 tmp;
        int i, vector = 0;
        struct e1000_hw *hw = &adapter->hw;

        adapter->eims_enable_mask = 0;

        /* set vector for other causes, i.e. link changes */
        switch (hw->mac.type) {
        case e1000_82575:
                tmp = rd32(E1000_CTRL_EXT);
                /* enable MSI-X PBA support*/
                tmp |= E1000_CTRL_EXT_PBA_CLR;

                /* Auto-Mask interrupts upon ICR read. */
                tmp |= E1000_CTRL_EXT_EIAME;
                tmp |= E1000_CTRL_EXT_IRCA;

                wr32(E1000_CTRL_EXT, tmp);

                /* enable msix_other interrupt */
                array_wr32(E1000_MSIXBM(0), vector++, E1000_EIMS_OTHER);
                adapter->eims_other = E1000_EIMS_OTHER;

                break;

        case e1000_82576:
        case e1000_82580:
        case e1000_i350:
        case e1000_i354:
        case e1000_i210:
        case e1000_i211:
                /* Turn on MSI-X capability first, or our settings
                 * won't stick.  And it will take days to debug.
                 */
                wr32(E1000_GPIE, E1000_GPIE_MSIX_MODE |
                     E1000_GPIE_PBA | E1000_GPIE_EIAME |
                     E1000_GPIE_NSICR);

                /* enable msix_other interrupt */
                adapter->eims_other = 1 << vector;
                tmp = (vector++ | E1000_IVAR_VALID) << 8;

                wr32(E1000_IVAR_MISC, tmp);
                break;
        default:
                /* do nothing, since nothing else supports MSI-X */
                break;
        } /* switch (hw->mac.type) */

        adapter->eims_enable_mask |= adapter->eims_other;

        for (i = 0; i < adapter->num_q_vectors; i++)
                igb_assign_vector(adapter->q_vector[i], vector++);

        wrfl();
}

/**
 *  igb_request_msix - Initialize MSI-X interrupts
 *  @adapter: board private structure to initialize
 *
 *  igb_request_msix allocates MSI-X vectors and requests interrupts from the
 *  kernel.
 **/
static int igb_request_msix(struct igb_adapter *adapter)
{
        struct net_device *netdev = adapter->netdev;
        struct e1000_hw *hw = &adapter->hw;
        int i, err = 0, vector = 0, free_vector = 0;

        err = request_irq(adapter->msix_entries[vector].vector,
                          igb_msix_other, 0, netdev->name, adapter);
        if (err)
                goto err_out;

        for (i = 0; i < adapter->num_q_vectors; i++) {
                struct igb_q_vector *q_vector = adapter->q_vector[i];

                vector++;

                q_vector->itr_register = hw->hw_addr + E1000_EITR(vector);

                if (q_vector->rx.ring && q_vector->tx.ring)
                        sprintf(q_vector->name, "%s-TxRx-%u", netdev->name,
                                q_vector->rx.ring->queue_index);
                else if (q_vector->tx.ring)
                        sprintf(q_vector->name, "%s-tx-%u", netdev->name,
                                q_vector->tx.ring->queue_index);
                else if (q_vector->rx.ring)
                        sprintf(q_vector->name, "%s-rx-%u", netdev->name,
                                q_vector->rx.ring->queue_index);
                else
                        sprintf(q_vector->name, "%s-unused", netdev->name);

                err = request_irq(adapter->msix_entries[vector].vector,
                                  igb_msix_ring, 0, q_vector->name,
                                  q_vector);
                if (err)
                        goto err_free;
        }

        igb_configure_msix(adapter);
        return 0;

err_free:
        /* free already assigned IRQs */
        free_irq(adapter->msix_entries[free_vector++].vector, adapter);

        vector--;
        for (i = 0; i < vector; i++) {
                free_irq(adapter->msix_entries[free_vector++].vector,
                         adapter->q_vector[i]);
        }
err_out:
        return err;
}

static void igb_reset_interrupt_capability(struct igb_adapter *adapter)
{
        if (adapter->msix_entries) {
                pci_disable_msix(adapter->pdev);
                kfree(adapter->msix_entries);
                adapter->msix_entries = NULL;
        } else if (adapter->flags & IGB_FLAG_HAS_MSI) {
                pci_disable_msi(adapter->pdev);
        }
}

/**
 *  igb_free_q_vector - Free memory allocated for specific interrupt vector
 *  @adapter: board private structure to initialize
 *  @v_idx: Index of vector to be freed
 *
 *  This function frees the memory allocated to the q_vector.  In addition if
 *  NAPI is enabled it will delete any references to the NAPI struct prior

 *  to freeing the q_vector.
 **/
static void igb_free_q_vector(struct igb_adapter *adapter, int v_idx)
{
        struct igb_q_vector *q_vector = adapter->q_vector[v_idx];

        if (q_vector->tx.ring)
                adapter->tx_ring[q_vector->tx.ring->queue_index] = NULL;

        if (q_vector->rx.ring)
                adapter->tx_ring[q_vector->rx.ring->queue_index] = NULL;

        adapter->q_vector[v_idx] = NULL;
        netif_napi_del(&q_vector->napi);

        /* ixgbe_get_stats64() might access the rings on this vector,
         * we must wait a grace period before freeing it.
         */
        kfree_rcu(q_vector, rcu);
}

/**
 *  igb_free_q_vectors - Free memory allocated for interrupt vectors
 *  @adapter: board private structure to initialize
 *
 *  This function frees the memory allocated to the q_vectors.  In addition if
 *  NAPI is enabled it will delete any references to the NAPI struct prior
 *  to freeing the q_vector.
 **/
static void igb_free_q_vectors(struct igb_adapter *adapter)
{
        int v_idx = adapter->num_q_vectors;

        adapter->num_tx_queues = 0;
        adapter->num_rx_queues = 0;
        adapter->num_q_vectors = 0;

        while (v_idx--)
                igb_free_q_vector(adapter, v_idx);
}

/**
 *  igb_clear_interrupt_scheme - reset the device to a state of no interrupts
 *  @adapter: board private structure to initialize
 *
 *  This function resets the device so that it has 0 Rx queues, Tx queues, and
 *  MSI-X interrupts allocated.
 */
static void igb_clear_interrupt_scheme(struct igb_adapter *adapter)
{
        igb_free_q_vectors(adapter);
        igb_reset_interrupt_capability(adapter);
}

/**
 *  igb_set_interrupt_capability - set MSI or MSI-X if supported
 *  @adapter: board private structure to initialize
 *  @msix: boolean value of MSIX capability
 *
 *  Attempt to configure interrupts using the best available
 *  capabilities of the hardware and kernel.
 **/
static void igb_set_interrupt_capability(struct igb_adapter *adapter, bool msix)
{
        int err;
        int numvecs, i;

        if (!msix)
                goto msi_only;

        /* Number of supported queues. */
        adapter->num_rx_queues = adapter->rss_queues;
        if (adapter->vfs_allocated_count)
                adapter->num_tx_queues = 1;
        else
                adapter->num_tx_queues = adapter->rss_queues;

        /* start with one vector for every Rx queue */
        numvecs = adapter->num_rx_queues;

        /* if Tx handler is separate add 1 for every Tx queue */
        if (!(adapter->flags & IGB_FLAG_QUEUE_PAIRS))
                numvecs += adapter->num_tx_queues;

        /* store the number of vectors reserved for queues */
        adapter->num_q_vectors = numvecs;

        /* add 1 vector for link status interrupts */
        numvecs++;
        adapter->msix_entries = kcalloc(numvecs, sizeof(struct msix_entry),
                                        GFP_KERNEL);

        if (!adapter->msix_entries)
                goto msi_only;

        for (i = 0; i < numvecs; i++)
                adapter->msix_entries[i].entry = i;

        err = pci_enable_msix(adapter->pdev,
                              adapter->msix_entries,
                              numvecs);
        if (err == 0)
                return;

        igb_reset_interrupt_capability(adapter);

        /* If we can't do MSI-X, try MSI */
msi_only:
#ifdef CONFIG_PCI_IOV
        /* disable SR-IOV for non MSI-X configurations */
        if (adapter->vf_data) {
                struct e1000_hw *hw = &adapter->hw;
                /* disable iov and allow time for transactions to clear */
                pci_disable_sriov(adapter->pdev);
                msleep(500);

                kfree(adapter->vf_data);
                adapter->vf_data = NULL;
                wr32(E1000_IOVCTL, E1000_IOVCTL_REUSE_VFQ);
                wrfl();
                msleep(100);
                dev_info(&adapter->pdev->dev, "IOV Disabled\n");
        }
#endif
        adapter->vfs_allocated_count = 0;
        adapter->rss_queues = 1;
        adapter->flags |= IGB_FLAG_QUEUE_PAIRS;
        adapter->num_rx_queues = 1;
        adapter->num_tx_queues = 1;
        adapter->num_q_vectors = 1;
        if (!pci_enable_msi(adapter->pdev))
                adapter->flags |= IGB_FLAG_HAS_MSI;
}

static void igb_add_ring(struct igb_ring *ring,
                         struct igb_ring_container *head)
{
        head->ring = ring;
        head->count++;
}

/**
 *  igb_alloc_q_vector - Allocate memory for a single interrupt vector
 *  @adapter: board private structure to initialize
 *  @v_count: q_vectors allocated on adapter, used for ring interleaving
 *  @v_idx: index of vector in adapter struct
 *  @txr_count: total number of Tx rings to allocate
 *  @txr_idx: index of first Tx ring to allocate
 *  @rxr_count: total number of Rx rings to allocate
 *  @rxr_idx: index of first Rx ring to allocate
 *
 *  We allocate one q_vector.  If allocation fails we return -ENOMEM.
 **/
static int igb_alloc_q_vector(struct igb_adapter *adapter,
                              int v_count, int v_idx,
                              int txr_count, int txr_idx,
                              int rxr_count, int rxr_idx)
{
        struct igb_q_vector *q_vector;
        struct igb_ring *ring;
        int ring_count, size;

        /* igb only supports 1 Tx and/or 1 Rx queue per vector */
        if (txr_count > 1 || rxr_count > 1)
                return -ENOMEM;

        ring_count = txr_count + rxr_count;
        size = sizeof(struct igb_q_vector) +
               (sizeof(struct igb_ring) * ring_count);

        /* allocate q_vector and rings */
        q_vector = kzalloc(size, GFP_KERNEL);
        if (!q_vector)
                return -ENOMEM;

        /* initialize NAPI */
        netif_napi_add(adapter->netdev, &q_vector->napi,
                       igb_poll, 64);

        /* tie q_vector and adapter together */
        adapter->q_vector[v_idx] = q_vector;
        q_vector->adapter = adapter;

        /* initialize work limits */
        q_vector->tx.work_limit = adapter->tx_work_limit;

        /* initialize ITR configuration */
        q_vector->itr_register = adapter->hw.hw_addr + E1000_EITR(0);
        q_vector->itr_val = IGB_START_ITR;

        /* initialize pointer to rings */
        ring = q_vector->ring;

        /* intialize ITR */
        if (rxr_count) {
                /* rx or rx/tx vector */
                if (!adapter->rx_itr_setting || adapter->rx_itr_setting > 3)
                        q_vector->itr_val = adapter->rx_itr_setting;
        } else {
                /* tx only vector */
                if (!adapter->tx_itr_setting || adapter->tx_itr_setting > 3)
                        q_vector->itr_val = adapter->tx_itr_setting;
        }

        if (txr_count) {
                /* assign generic ring traits */
                ring->dev = &adapter->pdev->dev;
                ring->netdev = adapter->netdev;

                /* configure backlink on ring */
                ring->q_vector = q_vector;

                /* update q_vector Tx values */
                igb_add_ring(ring, &q_vector->tx);

                /* For 82575, context index must be unique per ring. */
                if (adapter->hw.mac.type == e1000_82575)
                        set_bit(IGB_RING_FLAG_TX_CTX_IDX, &ring->flags);

                /* apply Tx specific ring traits */
                ring->count = adapter->tx_ring_count;
                ring->queue_index = txr_idx;

                /* assign ring to adapter */
                adapter->tx_ring[txr_idx] = ring;

                /* push pointer to next ring */
                ring++;
        }

        if (rxr_count) {
                /* assign generic ring traits */
                ring->dev = &adapter->pdev->dev;
                ring->netdev = adapter->netdev;

                /* configure backlink on ring */
                ring->q_vector = q_vector;

                /* update q_vector Rx values */
                igb_add_ring(ring, &q_vector->rx);

                /* set flag indicating ring supports SCTP checksum offload */
                if (adapter->hw.mac.type >= e1000_82576)
                        set_bit(IGB_RING_FLAG_RX_SCTP_CSUM, &ring->flags);

                /*
                 * On i350, i354, i210, and i211, loopback VLAN packets
                 * have the tag byte-swapped.
                 */
                if (adapter->hw.mac.type >= e1000_i350)
                        set_bit(IGB_RING_FLAG_RX_LB_VLAN_BSWAP, &ring->flags);

                /* apply Rx specific ring traits */
                ring->count = adapter->rx_ring_count;
                ring->queue_index = rxr_idx;

                /* assign ring to adapter */
                adapter->rx_ring[rxr_idx] = ring;
        }

        return 0;
}


/**
 *  igb_alloc_q_vectors - Allocate memory for interrupt vectors
 *  @adapter: board private structure to initialize
 *
 *  We allocate one q_vector per queue interrupt.  If allocation fails we
 *  return -ENOMEM.
 **/
static int igb_alloc_q_vectors(struct igb_adapter *adapter)
{
        int q_vectors = adapter->num_q_vectors;
        int rxr_remaining = adapter->num_rx_queues;
        int txr_remaining = adapter->num_tx_queues;
        int rxr_idx = 0, txr_idx = 0, v_idx = 0;
        int err;

        if (q_vectors >= (rxr_remaining + txr_remaining)) {
                for (; rxr_remaining; v_idx++) {
                        err = igb_alloc_q_vector(adapter, q_vectors, v_idx,
                                                 0, 0, 1, rxr_idx);

                        if (err)
                                goto err_out;

                        /* update counts and index */
                        rxr_remaining--;
                        rxr_idx++;
                }
        }

        for (; v_idx < q_vectors; v_idx++) {
                int rqpv = DIV_ROUND_UP(rxr_remaining, q_vectors - v_idx);
                int tqpv = DIV_ROUND_UP(txr_remaining, q_vectors - v_idx);
                err = igb_alloc_q_vector(adapter, q_vectors, v_idx,
                                         tqpv, txr_idx, rqpv, rxr_idx);

                if (err)
                        goto err_out;

                /* update counts and index */
                rxr_remaining -= rqpv;
                txr_remaining -= tqpv;
                rxr_idx++;
                txr_idx++;
        }

        return 0;

err_out:
        adapter->num_tx_queues = 0;
        adapter->num_rx_queues = 0;
        adapter->num_q_vectors = 0;

        while (v_idx--)
                igb_free_q_vector(adapter, v_idx);

        return -ENOMEM;
}

/**
 *  igb_init_interrupt_scheme - initialize interrupts, allocate queues/vectors
 *  @adapter: board private structure to initialize
 *  @msix: boolean value of MSIX capability
 *
 *  This function initializes the interrupts and allocates all of the queues.
 **/
static int igb_init_interrupt_scheme(struct igb_adapter *adapter, bool msix)
{
        struct pci_dev *pdev = adapter->pdev;
        int err;

        igb_set_interrupt_capability(adapter, msix);

        err = igb_alloc_q_vectors(adapter);
        if (err) {
                dev_err(&pdev->dev, "Unable to allocate memory for vectors\n");
                goto err_alloc_q_vectors;
        }

        igb_cache_ring_register(adapter);

        return 0;

err_alloc_q_vectors:
        igb_reset_interrupt_capability(adapter);
        return err;
}

/**
 *  igb_request_irq - initialize interrupts
 *  @adapter: board private structure to initialize
 *
 *  Attempts to configure interrupts using the best available
 *  capabilities of the hardware and kernel.
 **/
static int igb_request_irq(struct igb_adapter *adapter)
{
        struct net_device *netdev = adapter->netdev;
        struct pci_dev *pdev = adapter->pdev;
        int err = 0;

        if (adapter->msix_entries) {
                err = igb_request_msix(adapter);
                if (!err)
                        goto request_done;
                /* fall back to MSI */
                igb_free_all_tx_resources(adapter);
                igb_free_all_rx_resources(adapter);

                igb_clear_interrupt_scheme(adapter);
                err = igb_init_interrupt_scheme(adapter, false);
                if (err)
                        goto request_done;

                igb_setup_all_tx_resources(adapter);
                igb_setup_all_rx_resources(adapter);
                igb_configure(adapter);
        }

        igb_assign_vector(adapter->q_vector[0], 0);

        if (adapter->flags & IGB_FLAG_HAS_MSI) {
                err = request_irq(pdev->irq, igb_intr_msi, 0,
                                  netdev->name, adapter);
                if (!err)
                        goto request_done;

                /* fall back to legacy interrupts */
                igb_reset_interrupt_capability(adapter);
                adapter->flags &= ~IGB_FLAG_HAS_MSI;
        }

        err = request_irq(pdev->irq, igb_intr, IRQF_SHARED,
                          netdev->name, adapter);

        if (err)
                dev_err(&pdev->dev, "Error %d getting interrupt\n",
                        err);

request_done:
        return err;
}

static void igb_free_irq(struct igb_adapter *adapter)
{
        if (adapter->msix_entries) {
                int vector = 0, i;

                free_irq(adapter->msix_entries[vector++].vector, adapter);

                for (i = 0; i < adapter->num_q_vectors; i++)
                        free_irq(adapter->msix_entries[vector++].vector,
                                 adapter->q_vector[i]);
        } else {
                free_irq(adapter->pdev->irq, adapter);
        }
}

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

        /* we need to be careful when disabling interrupts.  The VFs are also
         * mapped into these registers and so clearing the bits can cause
         * issues on the VF drivers so we only need to clear what we set
         */
        if (adapter->msix_entries) {
                u32 regval = rd32(E1000_EIAM);
                wr32(E1000_EIAM, regval & ~adapter->eims_enable_mask);
                wr32(E1000_EIMC, adapter->eims_enable_mask);
                regval = rd32(E1000_EIAC);
                wr32(E1000_EIAC, regval & ~adapter->eims_enable_mask);
        }

        wr32(E1000_IAM, 0);
        wr32(E1000_IMC, ~0);
        wrfl();
        if (adapter->msix_entries) {
                int i;
                for (i = 0; i < adapter->num_q_vectors; i++)
                        synchronize_irq(adapter->msix_entries[i].vector);
        } else {
                synchronize_irq(adapter->pdev->irq);
        }
}

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

        if (adapter->msix_entries) {
                u32 ims = E1000_IMS_LSC | E1000_IMS_DOUTSYNC | E1000_IMS_DRSTA;
                u32 regval = rd32(E1000_EIAC);
                wr32(E1000_EIAC, regval | adapter->eims_enable_mask);
                regval = rd32(E1000_EIAM);
                wr32(E1000_EIAM, regval | adapter->eims_enable_mask);
                wr32(E1000_EIMS, adapter->eims_enable_mask);
                if (adapter->vfs_allocated_count) {
                        wr32(E1000_MBVFIMR, 0xFF);
                        ims |= E1000_IMS_VMMB;
                }
                wr32(E1000_IMS, ims);
        } else {
                wr32(E1000_IMS, IMS_ENABLE_MASK |
                                E1000_IMS_DRSTA);
                wr32(E1000_IAM, IMS_ENABLE_MASK |
                                E1000_IMS_DRSTA);
        }
}

static void igb_update_mng_vlan(struct igb_adapter *adapter)
{
        struct e1000_hw *hw = &adapter->hw;
        u16 vid = adapter->hw.mng_cookie.vlan_id;
        u16 old_vid = adapter->mng_vlan_id;

        if (hw->mng_cookie.status & E1000_MNG_DHCP_COOKIE_STATUS_VLAN) {
                /* add VID to filter table */
                igb_vfta_set(hw, vid, true);
                adapter->mng_vlan_id = vid;
        } else {
                adapter->mng_vlan_id = IGB_MNG_VLAN_NONE;
        }

        if ((old_vid != (u16)IGB_MNG_VLAN_NONE) &&
            (vid != old_vid) &&
            !test_bit(old_vid, adapter->active_vlans)) {
                /* remove VID from filter table */
                igb_vfta_set(hw, old_vid, false);
        }
}

/**
 *  igb_release_hw_control - release control of the h/w to f/w
 *  @adapter: address of board private structure
 *
 *  igb_release_hw_control resets CTRL_EXT:DRV_LOAD bit.
 *  For ASF and Pass Through versions of f/w this means that the
 *  driver is no longer loaded.
 **/
static void igb_release_hw_control(struct igb_adapter *adapter)
{
        struct e1000_hw *hw = &adapter->hw;
        u32 ctrl_ext;

        /* Let firmware take over control of h/w */
        ctrl_ext = rd32(E1000_CTRL_EXT);
        wr32(E1000_CTRL_EXT,
                        ctrl_ext & ~E1000_CTRL_EXT_DRV_LOAD);
}

/**
 *  igb_get_hw_control - get control of the h/w from f/w
 *  @adapter: address of board private structure
 *
 *  igb_get_hw_control sets CTRL_EXT:DRV_LOAD bit.
 *  For ASF and Pass Through versions of f/w this means that
 *  the driver is loaded.
 **/
static void igb_get_hw_control(struct igb_adapter *adapter)
{
        struct e1000_hw *hw = &adapter->hw;
        u32 ctrl_ext;

        /* Let firmware know the driver has taken over */
        ctrl_ext = rd32(E1000_CTRL_EXT);
        wr32(E1000_CTRL_EXT,
                        ctrl_ext | E1000_CTRL_EXT_DRV_LOAD);
}

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

        igb_get_hw_control(adapter);
        igb_set_rx_mode(netdev);

        igb_restore_vlan(adapter);

        igb_setup_tctl(adapter);
        igb_setup_mrqc(adapter);
        igb_setup_rctl(adapter);

        igb_configure_tx(adapter);
        igb_configure_rx(adapter);

        igb_rx_fifo_flush_82575(&adapter->hw);

        /* call igb_desc_unused which always leaves
         * at least 1 descriptor unused to make sure
         * next_to_use != next_to_clean
         */
        for (i = 0; i < adapter->num_rx_queues; i++) {
                struct igb_ring *ring = adapter->rx_ring[i];
                igb_alloc_rx_buffers(ring, igb_desc_unused(ring));
        }
}

/**
 *  igb_power_up_link - Power up the phy/serdes link
 *  @adapter: address of board private structure
 **/
void igb_power_up_link(struct igb_adapter *adapter)
{
        igb_reset_phy(&adapter->hw);

        if (adapter->hw.phy.media_type == e1000_media_type_copper)
                igb_power_up_phy_copper(&adapter->hw);
        else
                igb_power_up_serdes_link_82575(&adapter->hw);
}

/**
 *  igb_power_down_link - Power down the phy/serdes link
 *  @adapter: address of board private structure
 */
static void igb_power_down_link(struct igb_adapter *adapter)
{
        if (adapter->hw.phy.media_type == e1000_media_type_copper)
                igb_power_down_phy_copper_82575(&adapter->hw);
        else
                igb_shutdown_serdes_link_82575(&adapter->hw);
}

/**
 *  igb_up - Open the interface and prepare it to handle traffic
 *  @adapter: board private structure
 **/
int igb_up(struct igb_adapter *adapter)
{
        struct e1000_hw *hw = &adapter->hw;
        int i;

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

        clear_bit(__IGB_DOWN, &adapter->state);

        for (i = 0; i < adapter->num_q_vectors; i++)
                napi_enable(&(adapter->q_vector[i]->napi));

        if (adapter->msix_entries)
                igb_configure_msix(adapter);
        else
                igb_assign_vector(adapter->q_vector[0], 0);

        /* Clear any pending interrupts. */
        rd32(E1000_ICR);
        igb_irq_enable(adapter);

        /* notify VFs that reset has been completed */
        if (adapter->vfs_allocated_count) {
                u32 reg_data = rd32(E1000_CTRL_EXT);
                reg_data |= E1000_CTRL_EXT_PFRSTD;
                wr32(E1000_CTRL_EXT, reg_data);
        }

        netif_tx_start_all_queues(adapter->netdev);

        /* start the watchdog. */
        hw->mac.get_link_status = 1;
        schedule_work(&adapter->watchdog_task);

        return 0;
}

void igb_down(struct igb_adapter *adapter)
{
        struct net_device *netdev = adapter->netdev;
        struct e1000_hw *hw = &adapter->hw;
        u32 tctl, rctl;
        int i;

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

        /* disable receives in the hardware */
        rctl = rd32(E1000_RCTL);
        wr32(E1000_RCTL, rctl & ~E1000_RCTL_EN);
        /* flush and sleep below */

        netif_tx_stop_all_queues(netdev);

        /* disable transmits in the hardware */
        tctl = rd32(E1000_TCTL);
        tctl &= ~E1000_TCTL_EN;
        wr32(E1000_TCTL, tctl);
        /* flush both disables and wait for them to finish */
        wrfl();
        msleep(10);

        igb_irq_disable(adapter);

        for (i = 0; i < adapter->num_q_vectors; i++) {
                napi_synchronize(&(adapter->q_vector[i]->napi));
                napi_disable(&(adapter->q_vector[i]->napi));
        }


        del_timer_sync(&adapter->watchdog_timer);
        del_timer_sync(&adapter->phy_info_timer);

        netif_carrier_off(netdev);

        /* record the stats before reset*/
        spin_lock(&adapter->stats64_lock);
        igb_update_stats(adapter, &adapter->stats64);
        spin_unlock(&adapter->stats64_lock);

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

        if (!pci_channel_offline(adapter->pdev))
                igb_reset(adapter);
        igb_clean_all_tx_rings(adapter);
        igb_clean_all_rx_rings(adapter);
#ifdef CONFIG_IGB_DCA

        /* since we reset the hardware DCA settings were cleared */
        igb_setup_dca(adapter);
#endif
}

void igb_reinit_locked(struct igb_adapter *adapter)
{
        WARN_ON(in_interrupt());
        while (test_and_set_bit(__IGB_RESETTING, &adapter->state))
                msleep(1);
        igb_down(adapter);
        igb_up(adapter);
        clear_bit(__IGB_RESETTING, &adapter->state);
}

void igb_reset(struct igb_adapter *adapter)
{
        struct pci_dev *pdev = adapter->pdev;
        struct e1000_hw *hw = &adapter->hw;
        struct e1000_mac_info *mac = &hw->mac;
        struct e1000_fc_info *fc = &hw->fc;
        u32 pba = 0, tx_space, min_tx_space, min_rx_space, hwm;

        /* Repartition Pba for greater than 9k mtu
         * To take effect CTRL.RST is required.
         */
        switch (mac->type) {
        case e1000_i350:
        case e1000_i354:
        case e1000_82580:
                pba = rd32(E1000_RXPBS);
                pba = igb_rxpbs_adjust_82580(pba);
                break;
        case e1000_82576:
                pba = rd32(E1000_RXPBS);
                pba &= E1000_RXPBS_SIZE_MASK_82576;
                break;
        case e1000_82575:
        case e1000_i210:
        case e1000_i211:
        default:
                pba = E1000_PBA_34K;
                break;
        }

        if ((adapter->max_frame_size > ETH_FRAME_LEN + ETH_FCS_LEN) &&
            (mac->type < e1000_82576)) {
                /* adjust PBA for jumbo frames */
                wr32(E1000_PBA, pba);

                /* To maintain wire speed transmits, the Tx FIFO should be
                 * large enough to accommodate two full transmit packets,
                 * rounded up to the next 1KB and expressed in KB.  Likewise,
                 * the Rx FIFO should be large enough to accommodate at least
                 * one full receive packet and is similarly rounded up and
                 * expressed in KB.
                 */
                pba = rd32(E1000_PBA);
                /* upper 16 bits has Tx packet buffer allocation size in KB */
                tx_space = pba >> 16;
                /* lower 16 bits has Rx packet buffer allocation size in KB */
                pba &= 0xffff;
                /* the Tx fifo also stores 16 bytes of information about the Tx
                 * but don't include ethernet FCS because hardware appends it
                 */
                min_tx_space = (adapter->max_frame_size +
                                sizeof(union e1000_adv_tx_desc) -
                                ETH_FCS_LEN) * 2;
                min_tx_space = ALIGN(min_tx_space, 1024);
                min_tx_space >>= 10;
                /* software strips receive CRC, so leave room for it */
                min_rx_space = adapter->max_frame_size;
                min_rx_space = ALIGN(min_rx_space, 1024);
                min_rx_space >>= 10;

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

                        /* if short on Rx space, Rx wins and must trump Tx
                         * adjustment
                         */
                        if (pba < min_rx_space)
                                pba = min_rx_space;
                }
                wr32(E1000_PBA, pba);
        }

        /* flow control settings */
        /* The high water mark must be low enough to fit one full frame
         * (or the size used for early receive) above it in the Rx FIFO.
         * Set it to the lower of:
         * - 90% of the Rx FIFO size, or
         * - the full Rx FIFO size minus one full frame
         */
        hwm = min(((pba << 10) * 9 / 10),
                        ((pba << 10) - 2 * adapter->max_frame_size));

        fc->high_water = hwm & 0xFFFFFFF0;      /* 16-byte granularity */
        fc->low_water = fc->high_water - 16;
        fc->pause_time = 0xFFFF;
        fc->send_xon = 1;
        fc->current_mode = fc->requested_mode;

        /* disable receive for all VFs and wait one second */
        if (adapter->vfs_allocated_count) {
                int i;
                for (i = 0 ; i < adapter->vfs_allocated_count; i++)
                        adapter->vf_data[i].flags &= IGB_VF_FLAG_PF_SET_MAC;

                /* ping all the active vfs to let them know we are going down */
                igb_ping_all_vfs(adapter);

                /* disable transmits and receives */
                wr32(E1000_VFRE, 0);
                wr32(E1000_VFTE, 0);
        }

        /* Allow time for pending master requests to run */
        hw->mac.ops.reset_hw(hw);
        wr32(E1000_WUC, 0);

        if (hw->mac.ops.init_hw(hw))
                dev_err(&pdev->dev, "Hardware Error\n");

        /* Flow control settings reset on hardware reset, so guarantee flow
         * control is off when forcing speed.
         */
        if (!hw->mac.autoneg)
                igb_force_mac_fc(hw);

        igb_init_dmac(adapter, pba);
#ifdef CONFIG_IGB_HWMON
        /* Re-initialize the thermal sensor on i350 devices. */
        if (!test_bit(__IGB_DOWN, &adapter->state)) {
                if (mac->type == e1000_i350 && hw->bus.func == 0) {
                        /* If present, re-initialize the external thermal sensor
                         * interface.
                         */
                        if (adapter->ets)
                                mac->ops.init_thermal_sensor_thresh(hw);
                }
        }
#endif
        if (!netif_running(adapter->netdev))
                igb_power_down_link(adapter);

        igb_update_mng_vlan(adapter);

        /* Enable h/w to recognize an 802.1Q VLAN Ethernet packet */
        wr32(E1000_VET, ETHERNET_IEEE_VLAN_TYPE);

        /* Re-enable PTP, where applicable. */
        igb_ptp_reset(adapter);

        igb_get_phy_info(hw);
}

static netdev_features_t igb_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 igb_set_features(struct net_device *netdev,
        netdev_features_t features)
{
        netdev_features_t changed = netdev->features ^ features;
        struct igb_adapter *adapter = netdev_priv(netdev);

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

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

        netdev->features = features;

        if (netif_running(netdev))
                igb_reinit_locked(adapter);
        else
                igb_reset(adapter);

        return 0;
}

static const struct net_device_ops igb_netdev_ops = {
        .ndo_open               = igb_open,
        .ndo_stop               = igb_close,
        .ndo_start_xmit         = igb_xmit_frame,
        .ndo_get_stats64        = igb_get_stats64,
        .ndo_set_rx_mode        = igb_set_rx_mode,
        .ndo_set_mac_address    = igb_set_mac,
        .ndo_change_mtu         = igb_change_mtu,
        .ndo_do_ioctl           = igb_ioctl,
        .ndo_tx_timeout         = igb_tx_timeout,
        .ndo_validate_addr      = eth_validate_addr,
        .ndo_vlan_rx_add_vid    = igb_vlan_rx_add_vid,
        .ndo_vlan_rx_kill_vid   = igb_vlan_rx_kill_vid,
        .ndo_set_vf_mac         = igb_ndo_set_vf_mac,
        .ndo_set_vf_vlan        = igb_ndo_set_vf_vlan,
        .ndo_set_vf_tx_rate     = igb_ndo_set_vf_bw,
        .ndo_set_vf_spoofchk    = igb_ndo_set_vf_spoofchk,
        .ndo_get_vf_config      = igb_ndo_get_vf_config,
#ifdef CONFIG_NET_POLL_CONTROLLER
        .ndo_poll_controller    = igb_netpoll,
#endif
        .ndo_fix_features       = igb_fix_features,
        .ndo_set_features       = igb_set_features,
};

/**
 * igb_set_fw_version - Configure version string for ethtool
 * @adapter: adapter struct
 **/
void igb_set_fw_version(struct igb_adapter *adapter)
{
        struct e1000_hw *hw = &adapter->hw;
        struct e1000_fw_version fw;

        igb_get_fw_version(hw, &fw);

        switch (hw->mac.type) {
        case e1000_i211:
                snprintf(adapter->fw_version, sizeof(adapter->fw_version),
                         "%2d.%2d-%d",
                         fw.invm_major, fw.invm_minor, fw.invm_img_type);
                break;

        default:
                /* if option is rom valid, display its version too */
                if (fw.or_valid) {
                        snprintf(adapter->fw_version,
                                 sizeof(adapter->fw_version),
                                 "%d.%d, 0x%08x, %d.%d.%d",
                                 fw.eep_major, fw.eep_minor, fw.etrack_id,
                                 fw.or_major, fw.or_build, fw.or_patch);
                /* no option rom */
                } else {
                        snprintf(adapter->fw_version,
                                 sizeof(adapter->fw_version),
                                 "%d.%d, 0x%08x",
                                 fw.eep_major, fw.eep_minor, fw.etrack_id);
                }
                break;
        }
        return;
}

/**
 *  igb_init_i2c - Init I2C interface
 *  @adapter: pointer to adapter structure
 **/
static s32 igb_init_i2c(struct igb_adapter *adapter)
{
        s32 status = E1000_SUCCESS;

        /* I2C interface supported on i350 devices */
        if (adapter->hw.mac.type != e1000_i350)
                return E1000_SUCCESS;

        /* Initialize the i2c bus which is controlled by the registers.
         * This bus will use the i2c_algo_bit structue that implements
         * the protocol through toggling of the 4 bits in the register.
         */
        adapter->i2c_adap.owner = THIS_MODULE;
        adapter->i2c_algo = igb_i2c_algo;
        adapter->i2c_algo.data = adapter;
        adapter->i2c_adap.algo_data = &adapter->i2c_algo;
        adapter->i2c_adap.dev.parent = &adapter->pdev->dev;
        strlcpy(adapter->i2c_adap.name, "igb BB",
                sizeof(adapter->i2c_adap.name));
        status = i2c_bit_add_bus(&adapter->i2c_adap);
        return status;
}

/**
 *  igb_probe - Device Initialization Routine
 *  @pdev: PCI device information struct
 *  @ent: entry in igb_pci_tbl
 *
 *  Returns 0 on success, negative on failure
 *
 *  igb_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 igb_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
{
        struct net_device *netdev;
        struct igb_adapter *adapter;
        struct e1000_hw *hw;

        u16 eeprom_data = 0;
        s32 ret_val;
        static int global_quad_port_a; /* global quad port a indication */
        const struct e1000_info *ei = igb_info_tbl[ent->driver_data];
        unsigned long mmio_start, mmio_len;
        int err, pci_using_dac;
        u8 part_str[E1000_PBANUM_LENGTH];

        /* Catch broken hardware that put the wrong VF device ID in
         * the PCIe SR-IOV capability.
         */
        if (pdev->is_virtfn) {
                WARN(1, KERN_ERR "%s (%hx:%hx) should not be a VF!\n",
                        pci_name(pdev), pdev->vendor, pdev->device);
                return -EINVAL;
        }

        err = pci_enable_device_mem(pdev);
        if (err)
                return err;

        pci_using_dac = 0;
        err = dma_set_mask(&pdev->dev, DMA_BIT_MASK(64));
        if (!err) {
                err = dma_set_coherent_mask(&pdev->dev, DMA_BIT_MASK(64));
                if (!err)
                        pci_using_dac = 1;
        } else {
                err = dma_set_mask(&pdev->dev, DMA_BIT_MASK(32));
                if (err) {
                        err = dma_set_coherent_mask(&pdev->dev,
                                                    DMA_BIT_MASK(32));
                        if (err) {
                                dev_err(&pdev->dev,
                                        "No usable DMA configuration, aborting\n");
                                goto err_dma;
                        }
                }
        }

        err = pci_request_selected_regions(pdev, pci_select_bars(pdev,
                                           IORESOURCE_MEM),
                                           igb_driver_name);
        if (err)
                goto err_pci_reg;

        pci_enable_pcie_error_reporting(pdev);

        pci_set_master(pdev);
        pci_save_state(pdev);

        err = -ENOMEM;
        netdev = alloc_etherdev_mq(sizeof(struct igb_adapter),
                                   IGB_MAX_TX_QUEUES);
        if (!netdev)
                goto err_alloc_etherdev;

        SET_NETDEV_DEV(netdev, &pdev->dev);

        pci_set_drvdata(pdev, netdev);
        adapter = netdev_priv(netdev);
        adapter->netdev = netdev;
        adapter->pdev = pdev;
        hw = &adapter->hw;
        hw->back = adapter;
        adapter->msg_enable = netif_msg_init(debug, DEFAULT_MSG_ENABLE);

        mmio_start = pci_resource_start(pdev, 0);
        mmio_len = pci_resource_len(pdev, 0);

        err = -EIO;
        hw->hw_addr = ioremap(mmio_start, mmio_len);
        if (!hw->hw_addr)
                goto err_ioremap;

        netdev->netdev_ops = &igb_netdev_ops;
        igb_set_ethtool_ops(netdev);
        netdev->watchdog_timeo = 5 * HZ;

        strncpy(netdev->name, pci_name(pdev), sizeof(netdev->name) - 1);

        netdev->mem_start = mmio_start;
        netdev->mem_end = mmio_start + mmio_len;

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

        /* Copy the default MAC, PHY and NVM function pointers */
        memcpy(&hw->mac.ops, ei->mac_ops, sizeof(hw->mac.ops));
        memcpy(&hw->phy.ops, ei->phy_ops, sizeof(hw->phy.ops));
        memcpy(&hw->nvm.ops, ei->nvm_ops, sizeof(hw->nvm.ops));
        /* Initialize skew-specific constants */
        err = ei->get_invariants(hw);
        if (err)
                goto err_sw_init;

        /* setup the private structure */
        err = igb_sw_init(adapter);
        if (err)
                goto err_sw_init;

        igb_get_bus_info_pcie(hw);

        hw->phy.autoneg_wait_to_complete = false;

        /* Copper options */
        if (hw->phy.media_type == e1000_media_type_copper) {
                hw->phy.mdix = AUTO_ALL_MODES;
                hw->phy.disable_polarity_correction = false;
                hw->phy.ms_type = e1000_ms_hw_default;
        }

        if (igb_check_reset_block(hw))
                dev_info(&pdev->dev,
                        "PHY reset is blocked due to SOL/IDER session.\n");

        /* features is initialized to 0 in allocation, it might have bits
         * set by igb_sw_init so we should use an or instead of an
         * assignment.
         */
        netdev->features |= NETIF_F_SG |
                            NETIF_F_IP_CSUM |
                            NETIF_F_IPV6_CSUM |
                            NETIF_F_TSO |
                            NETIF_F_TSO6 |
                            NETIF_F_RXHASH |
                            NETIF_F_RXCSUM |
                            NETIF_F_HW_VLAN_CTAG_RX |
                            NETIF_F_HW_VLAN_CTAG_TX;

        /* copy netdev features into list of user selectable features */
        netdev->hw_features |= netdev->features;
        netdev->hw_features |= NETIF_F_RXALL;

        /* set this bit last since it cannot be part of hw_features */
        netdev->features |= NETIF_F_HW_VLAN_CTAG_FILTER;

        netdev->vlan_features |= NETIF_F_TSO |
                                 NETIF_F_TSO6 |
                                 NETIF_F_IP_CSUM |
                                 NETIF_F_IPV6_CSUM |
                                 NETIF_F_SG;

        netdev->priv_flags |= IFF_SUPP_NOFCS;

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

        if (hw->mac.type >= e1000_82576) {
                netdev->hw_features |= NETIF_F_SCTP_CSUM;
                netdev->features |= NETIF_F_SCTP_CSUM;
        }

        netdev->priv_flags |= IFF_UNICAST_FLT;

        adapter->en_mng_pt = igb_enable_mng_pass_thru(hw);

        /* before reading the NVM, reset the controller to put the device in a
         * known good starting state
         */
        hw->mac.ops.reset_hw(hw);

        /* make sure the NVM is good , i211 parts have special NVM that
         * doesn't contain a checksum
         */
        if (hw->mac.type != e1000_i211) {
                if (hw->nvm.ops.validate(hw) < 0) {
                        dev_err(&pdev->dev, "The NVM Checksum Is Not Valid\n");
                        err = -EIO;
                        goto err_eeprom;
                }
        }

        /* copy the MAC address out of the NVM */
        if (hw->mac.ops.read_mac_addr(hw))
                dev_err(&pdev->dev, "NVM Read Error\n");

        memcpy(netdev->dev_addr, hw->mac.addr, netdev->addr_len);

        if (!is_valid_ether_addr(netdev->dev_addr)) {
                dev_err(&pdev->dev, "Invalid MAC Address\n");
                err = -EIO;
                goto err_eeprom;
        }

        /* get firmware version for ethtool -i */
        igb_set_fw_version(adapter);

        setup_timer(&adapter->watchdog_timer, igb_watchdog,
                    (unsigned long) adapter);
        setup_timer(&adapter->phy_info_timer, igb_update_phy_info,
                    (unsigned long) adapter);

        INIT_WORK(&adapter->reset_task, igb_reset_task);
        INIT_WORK(&adapter->watchdog_task, igb_watchdog_task);

        /* Initialize link properties that are user-changeable */
        adapter->fc_autoneg = true;
        hw->mac.autoneg = true;
        hw->phy.autoneg_advertised = 0x2f;

        hw->fc.requested_mode = e1000_fc_default;
        hw->fc.current_mode = e1000_fc_default;

        igb_validate_mdi_setting(hw);

        /* By default, support wake on port A */
        if (hw->bus.func == 0)
                adapter->flags |= IGB_FLAG_WOL_SUPPORTED;

        /* Check the NVM for wake support on non-port A ports */
        if (hw->mac.type >= e1000_82580)
                hw->nvm.ops.read(hw, NVM_INIT_CONTROL3_PORT_A +
                                 NVM_82580_LAN_FUNC_OFFSET(hw->bus.func), 1,
                                 &eeprom_data);
        else if (hw->bus.func == 1)
                hw->nvm.ops.read(hw, NVM_INIT_CONTROL3_PORT_B, 1, &eeprom_data);

        if (eeprom_data & IGB_EEPROM_APME)
                adapter->flags |= IGB_FLAG_WOL_SUPPORTED;

        /* now that we have the eeprom settings, apply the special cases where
         * the eeprom may be wrong or the board simply won't support wake on
         * lan on a particular port
         */
        switch (pdev->device) {
        case E1000_DEV_ID_82575GB_QUAD_COPPER:
                adapter->flags &= ~IGB_FLAG_WOL_SUPPORTED;
                break;
        case E1000_DEV_ID_82575EB_FIBER_SERDES:
        case E1000_DEV_ID_82576_FIBER:
        case E1000_DEV_ID_82576_SERDES:
                /* Wake events only supported on port A for dual fiber
                 * regardless of eeprom setting
                 */
                if (rd32(E1000_STATUS) & E1000_STATUS_FUNC_1)
                        adapter->flags &= ~IGB_FLAG_WOL_SUPPORTED;
                break;
        case E1000_DEV_ID_82576_QUAD_COPPER:
        case E1000_DEV_ID_82576_QUAD_COPPER_ET2:
                /* if quad port adapter, disable WoL on all but port A */
                if (global_quad_port_a != 0)
                        adapter->flags &= ~IGB_FLAG_WOL_SUPPORTED;
                else
                        adapter->flags |= IGB_FLAG_QUAD_PORT_A;
                /* Reset for multiple quad port adapters */
                if (++global_quad_port_a == 4)
                        global_quad_port_a = 0;
                break;
        default:
                /* If the device can't wake, don't set software support */
                if (!device_can_wakeup(&adapter->pdev->dev))
                        adapter->flags &= ~IGB_FLAG_WOL_SUPPORTED;
        }

        /* initialize the wol settings based on the eeprom settings */
        if (adapter->flags & IGB_FLAG_WOL_SUPPORTED)
                adapter->wol |= E1000_WUFC_MAG;

        /* Some vendors want WoL disabled by default, but still supported */
        if ((hw->mac.type == e1000_i350) &&
            (pdev->subsystem_vendor == PCI_VENDOR_ID_HP)) {
                adapter->flags |= IGB_FLAG_WOL_SUPPORTED;
                adapter->wol = 0;
        }

        device_set_wakeup_enable(&adapter->pdev->dev,
                                 adapter->flags & IGB_FLAG_WOL_SUPPORTED);

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

        /* Init the I2C interface */
        err = igb_init_i2c(adapter);
        if (err) {
                dev_err(&pdev->dev, "failed to init i2c interface\n");
                goto err_eeprom;
        }

        /* let the f/w know that the h/w is now under the control of the
         * driver. */
        igb_get_hw_control(adapter);

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

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

#ifdef CONFIG_IGB_DCA
        if (dca_add_requester(&pdev->dev) == 0) {
                adapter->flags |= IGB_FLAG_DCA_ENABLED;
                dev_info(&pdev->dev, "DCA enabled\n");
                igb_setup_dca(adapter);
        }

#endif
#ifdef CONFIG_IGB_HWMON
        /* Initialize the thermal sensor on i350 devices. */
        if (hw->mac.type == e1000_i350 && hw->bus.func == 0) {
                u16 ets_word;

                /* Read the NVM to determine if this i350 device supports an
                 * external thermal sensor.
                 */
                hw->nvm.ops.read(hw, NVM_ETS_CFG, 1, &ets_word);
                if (ets_word != 0x0000 && ets_word != 0xFFFF)
                        adapter->ets = true;
                else
                        adapter->ets = false;
                if (igb_sysfs_init(adapter))
                        dev_err(&pdev->dev,
                                "failed to allocate sysfs resources\n");
        } else {
                adapter->ets = false;
        }
#endif
        /* do hw tstamp init after resetting */
        igb_ptp_init(adapter);

        dev_info(&pdev->dev, "Intel(R) Gigabit Ethernet Network Connection\n");
        /* print bus type/speed/width info, not applicable to i354 */
        if (hw->mac.type != e1000_i354) {
                dev_info(&pdev->dev, "%s: (PCIe:%s:%s) %pM\n",
                         netdev->name,
                         ((hw->bus.speed == e1000_bus_speed_2500) ? "2.5Gb/s" :
                          (hw->bus.speed == e1000_bus_speed_5000) ? "5.0Gb/s" :
                           "unknown"),
                         ((hw->bus.width == e1000_bus_width_pcie_x4) ?
                          "Width x4" :
                          (hw->bus.width == e1000_bus_width_pcie_x2) ?
                          "Width x2" :
                          (hw->bus.width == e1000_bus_width_pcie_x1) ?
                          "Width x1" : "unknown"), netdev->dev_addr);
        }

        ret_val = igb_read_part_string(hw, part_str, E1000_PBANUM_LENGTH);
        if (ret_val)
                strcpy(part_str, "Unknown");
        dev_info(&pdev->dev, "%s: PBA No: %s\n", netdev->name, part_str);
        dev_info(&pdev->dev,
                "Using %s interrupts. %d rx queue(s), %d tx queue(s)\n",
                adapter->msix_entries ? "MSI-X" :
                (adapter->flags & IGB_FLAG_HAS_MSI) ? "MSI" : "legacy",
                adapter->num_rx_queues, adapter->num_tx_queues);
        switch (hw->mac.type) {
        case e1000_i350:
        case e1000_i210:
        case e1000_i211:
                igb_set_eee_i350(hw);
                break;
        case e1000_i354:
                if (hw->phy.media_type == e1000_media_type_copper) {
                        if ((rd32(E1000_CTRL_EXT) &
                            E1000_CTRL_EXT_LINK_MODE_SGMII))
                                igb_set_eee_i354(hw);
                }
                break;
        default:
                break;
        }

        pm_runtime_put_noidle(&pdev->dev);
        return 0;

err_register:
        igb_release_hw_control(adapter);
        memset(&adapter->i2c_adap, 0, sizeof(adapter->i2c_adap));
err_eeprom:
        if (!igb_check_reset_block(hw))
                igb_reset_phy(hw);

        if (hw->flash_address)
                iounmap(hw->flash_address);
err_sw_init:
        igb_clear_interrupt_scheme(adapter);
        iounmap(hw->hw_addr);
err_ioremap:
        free_netdev(netdev);
err_alloc_etherdev:
        pci_release_selected_regions(pdev,
                                     pci_select_bars(pdev, IORESOURCE_MEM));
err_pci_reg:
err_dma:
        pci_disable_device(pdev);
        return err;
}

#ifdef CONFIG_PCI_IOV
static int  igb_disable_sriov(struct pci_dev *pdev)
{
        struct net_device *netdev = pci_get_drvdata(pdev);
        struct igb_adapter *adapter = netdev_priv(netdev);
        struct e1000_hw *hw = &adapter->hw;

        /* reclaim resources allocated to VFs */
        if (adapter->vf_data) {
                /* disable iov and allow time for transactions to clear */
                if (pci_vfs_assigned(pdev)) {
                        dev_warn(&pdev->dev,
                                 "Cannot deallocate SR-IOV virtual functions while they are assigned - VFs will not be deallocated\n");
                        return -EPERM;
                } else {
                        pci_disable_sriov(pdev);
                        msleep(500);
                }

                kfree(adapter->vf_data);
                adapter->vf_data = NULL;
                adapter->vfs_allocated_count = 0;
                wr32(E1000_IOVCTL, E1000_IOVCTL_REUSE_VFQ);
                wrfl();
                msleep(100);
                dev_info(&pdev->dev, "IOV Disabled\n");

                /* Re-enable DMA Coalescing flag since IOV is turned off */
                adapter->flags |= IGB_FLAG_DMAC;
        }

        return 0;
}

static int igb_enable_sriov(struct pci_dev *pdev, int num_vfs)
{
        struct net_device *netdev = pci_get_drvdata(pdev);
        struct igb_adapter *adapter = netdev_priv(netdev);
        int old_vfs = pci_num_vf(pdev);
        int err = 0;
        int i;

        if (!num_vfs)
                goto out;
        else if (old_vfs && old_vfs == num_vfs)
                goto out;
        else if (old_vfs && old_vfs != num_vfs)
                err = igb_disable_sriov(pdev);

        if (err)
                goto out;

        if (num_vfs > 7) {
                err = -EPERM;
                goto out;
        }

        adapter->vfs_allocated_count = num_vfs;

        adapter->vf_data = kcalloc(adapter->vfs_allocated_count,
                                sizeof(struct vf_data_storage), GFP_KERNEL);

        /* if allocation failed then we do not support SR-IOV */
        if (!adapter->vf_data) {
                adapter->vfs_allocated_count = 0;
                dev_err(&pdev->dev,
                        "Unable to allocate memory for VF Data Storage\n");
                err = -ENOMEM;
                goto out;
        }

        err = pci_enable_sriov(pdev, adapter->vfs_allocated_count);
        if (err)
                goto err_out;

        dev_info(&pdev->dev, "%d VFs allocated\n",
                 adapter->vfs_allocated_count);
        for (i = 0; i < adapter->vfs_allocated_count; i++)
                igb_vf_configure(adapter, i);

        /* DMA Coalescing is not supported in IOV mode. */
        adapter->flags &= ~IGB_FLAG_DMAC;
        goto out;

err_out:
        kfree(adapter->vf_data);
        adapter->vf_data = NULL;
        adapter->vfs_allocated_count = 0;
out:
        return err;
}

#endif
/**
 *  igb_remove_i2c - Cleanup  I2C interface
 *  @adapter: pointer to adapter structure
 **/
static void igb_remove_i2c(struct igb_adapter *adapter)
{
        /* free the adapter bus structure */
        i2c_del_adapter(&adapter->i2c_adap);
}

/**
 *  igb_remove - Device Removal Routine
 *  @pdev: PCI device information struct
 *
 *  igb_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 igb_remove(struct pci_dev *pdev)
{
        struct net_device *netdev = pci_get_drvdata(pdev);
        struct igb_adapter *adapter = netdev_priv(netdev);
        struct e1000_hw *hw = &adapter->hw;

        pm_runtime_get_noresume(&pdev->dev);
#ifdef CONFIG_IGB_HWMON
        igb_sysfs_exit(adapter);
#endif
        igb_remove_i2c(adapter);
        igb_ptp_stop(adapter);
        /* The watchdog timer may be rescheduled, so explicitly
         * disable watchdog from being rescheduled.
         */
        set_bit(__IGB_DOWN, &adapter->state);
        del_timer_sync(&adapter->watchdog_timer);
        del_timer_sync(&adapter->phy_info_timer);

        cancel_work_sync(&adapter->reset_task);
        cancel_work_sync(&adapter->watchdog_task);

#ifdef CONFIG_IGB_DCA
        if (adapter->flags & IGB_FLAG_DCA_ENABLED) {
                dev_info(&pdev->dev, "DCA disabled\n");
                dca_remove_requester(&pdev->dev);
                adapter->flags &= ~IGB_FLAG_DCA_ENABLED;
                wr32(E1000_DCA_CTRL, E1000_DCA_CTRL_DCA_MODE_DISABLE);
        }
#endif

        /* Release control of h/w to f/w.  If f/w is AMT enabled, this
         * would have already happened in close and is redundant.
         */
        igb_release_hw_control(adapter);

        unregister_netdev(netdev);

        igb_clear_interrupt_scheme(adapter);

#ifdef CONFIG_PCI_IOV
        igb_disable_sriov(pdev);
#endif

        iounmap(hw->hw_addr);
        if (hw->flash_address)
                iounmap(hw->flash_address);
        pci_release_selected_regions(pdev,
                                     pci_select_bars(pdev, IORESOURCE_MEM));

        kfree(adapter->shadow_vfta);
        free_netdev(netdev);

        pci_disable_pcie_error_reporting(pdev);

        pci_disable_device(pdev);
}

/**
 *  igb_probe_vfs - Initialize vf data storage and add VFs to pci config space
 *  @adapter: board private structure to initialize
 *
 *  This function initializes the vf specific data storage and then attempts to
 *  allocate the VFs.  The reason for ordering it this way is because it is much
 *  mor expensive time wise to disable SR-IOV than it is to allocate and free
 *  the memory for the VFs.
 **/
static void igb_probe_vfs(struct igb_adapter *adapter)
{
#ifdef CONFIG_PCI_IOV
        struct pci_dev *pdev = adapter->pdev;
        struct e1000_hw *hw = &adapter->hw;

        /* Virtualization features not supported on i210 family. */
        if ((hw->mac.type == e1000_i210) || (hw->mac.type == e1000_i211))
                return;

        pci_sriov_set_totalvfs(pdev, 7);
        igb_enable_sriov(pdev, max_vfs);

#endif /* CONFIG_PCI_IOV */
}

static void igb_init_queue_configuration(struct igb_adapter *adapter)
{
        struct e1000_hw *hw = &adapter->hw;
        u32 max_rss_queues;

        /* Determine the maximum number of RSS queues supported. */
        switch (hw->mac.type) {
        case e1000_i211:
                max_rss_queues = IGB_MAX_RX_QUEUES_I211;
                break;
        case e1000_82575:
        case e1000_i210:
                max_rss_queues = IGB_MAX_RX_QUEUES_82575;
                break;
        case e1000_i350:
                /* I350 cannot do RSS and SR-IOV at the same time */
                if (!!adapter->vfs_allocated_count) {
                        max_rss_queues = 1;
                        break;
                }
                /* fall through */
        case e1000_82576:
                if (!!adapter->vfs_allocated_count) {
                        max_rss_queues = 2;
                        break;
                }
                /* fall through */
        case e1000_82580:
        case e1000_i354:
        default:
                max_rss_queues = IGB_MAX_RX_QUEUES;
                break;
        }

        adapter->rss_queues = min_t(u32, max_rss_queues, num_online_cpus());

        /* Determine if we need to pair queues. */
        switch (hw->mac.type) {
        case e1000_82575:
        case e1000_i211:
                /* Device supports enough interrupts without queue pairing. */
                break;
        case e1000_82576:
                /* If VFs are going to be allocated with RSS queues then we
                 * should pair the queues in order to conserve interrupts due
                 * to limited supply.
                 */
                if ((adapter->rss_queues > 1) &&
                    (adapter->vfs_allocated_count > 6))
                        adapter->flags |= IGB_FLAG_QUEUE_PAIRS;
                /* fall through */
        case e1000_82580:
        case e1000_i350:
        case e1000_i354:
        case e1000_i210:
        default:
                /* If rss_queues > half of max_rss_queues, pair the queues in
                 * order to conserve interrupts due to limited supply.
                 */
                if (adapter->rss_queues > (max_rss_queues / 2))
                        adapter->flags |= IGB_FLAG_QUEUE_PAIRS;
                break;
        }
}

/**
 *  igb_sw_init - Initialize general software structures (struct igb_adapter)
 *  @adapter: board private structure to initialize
 *
 *  igb_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 igb_sw_init(struct igb_adapter *adapter)
{
        struct e1000_hw *hw = &adapter->hw;
        struct net_device *netdev = adapter->netdev;
        struct pci_dev *pdev = adapter->pdev;

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

        /* set default ring sizes */
        adapter->tx_ring_count = IGB_DEFAULT_TXD;
        adapter->rx_ring_count = IGB_DEFAULT_RXD;

        /* set default ITR values */
        adapter->rx_itr_setting = IGB_DEFAULT_ITR;
        adapter->tx_itr_setting = IGB_DEFAULT_ITR;

        /* set default work limits */
        adapter->tx_work_limit = IGB_DEFAULT_TX_WORK;

        adapter->max_frame_size = netdev->mtu + ETH_HLEN + ETH_FCS_LEN +
                                  VLAN_HLEN;
        adapter->min_frame_size = ETH_ZLEN + ETH_FCS_LEN;

        spin_lock_init(&adapter->stats64_lock);
#ifdef CONFIG_PCI_IOV
        switch (hw->mac.type) {
        case e1000_82576:
        case e1000_i350:
                if (max_vfs > 7) {
                        dev_warn(&pdev->dev,
                                 "Maximum of 7 VFs per PF, using max\n");
                        max_vfs = adapter->vfs_allocated_count = 7;
                } else
                        adapter->vfs_allocated_count = max_vfs;
                if (adapter->vfs_allocated_count)
                        dev_warn(&pdev->dev,
                                 "Enabling SR-IOV VFs using the module parameter is deprecated - please use the pci sysfs interface.\n");
                break;
        default:
                break;
        }
#endif /* CONFIG_PCI_IOV */

        igb_init_queue_configuration(adapter);

        /* Setup and initialize a copy of the hw vlan table array */
        adapter->shadow_vfta = kcalloc(E1000_VLAN_FILTER_TBL_SIZE, sizeof(u32),
                                       GFP_ATOMIC);

        /* This call may decrease the number of queues */
        if (igb_init_interrupt_scheme(adapter, true)) {
                dev_err(&pdev->dev, "Unable to allocate memory for queues\n");
                return -ENOMEM;
        }

        igb_probe_vfs(adapter);

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

        if (hw->mac.type >= e1000_i350)
                adapter->flags &= ~IGB_FLAG_DMAC;

        set_bit(__IGB_DOWN, &adapter->state);
        return 0;
}

/**
 *  igb_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 __igb_open(struct net_device *netdev, bool resuming)
{
        struct igb_adapter *adapter = netdev_priv(netdev);
        struct e1000_hw *hw = &adapter->hw;
        struct pci_dev *pdev = adapter->pdev;
        int err;
        int i;

        /* disallow open during test */
        if (test_bit(__IGB_TESTING, &adapter->state)) {
                WARN_ON(resuming);
                return -EBUSY;
        }

        if (!resuming)
                pm_runtime_get_sync(&pdev->dev);

        netif_carrier_off(netdev);

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

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

        igb_power_up_link(adapter);

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

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

        /* Notify the stack of the actual queue counts. */
        err = netif_set_real_num_tx_queues(adapter->netdev,
                                           adapter->num_tx_queues);
        if (err)
                goto err_set_queues;

        err = netif_set_real_num_rx_queues(adapter->netdev,
                                           adapter->num_rx_queues);
        if (err)
                goto err_set_queues;

        /* From here on the code is the same as igb_up() */
        clear_bit(__IGB_DOWN, &adapter->state);

        for (i = 0; i < adapter->num_q_vectors; i++)
                napi_enable(&(adapter->q_vector[i]->napi));

        /* Clear any pending interrupts. */
        rd32(E1000_ICR);

        igb_irq_enable(adapter);

        /* notify VFs that reset has been completed */
        if (adapter->vfs_allocated_count) {
                u32 reg_data = rd32(E1000_CTRL_EXT);
                reg_data |= E1000_CTRL_EXT_PFRSTD;
                wr32(E1000_CTRL_EXT, reg_data);
        }

        netif_tx_start_all_queues(netdev);

        if (!resuming)
                pm_runtime_put(&pdev->dev);

        /* start the watchdog. */
        hw->mac.get_link_status = 1;
        schedule_work(&adapter->watchdog_task);

        return 0;

err_set_queues:
        igb_free_irq(adapter);
err_req_irq:
        igb_release_hw_control(adapter);
        igb_power_down_link(adapter);
        igb_free_all_rx_resources(adapter);
err_setup_rx:
        igb_free_all_tx_resources(adapter);
err_setup_tx:
        igb_reset(adapter);
        if (!resuming)
                pm_runtime_put(&pdev->dev);

        return err;
}

static int igb_open(struct net_device *netdev)
{
        return __igb_open(netdev, false);
}

/**
 *  igb_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 driver's 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 __igb_close(struct net_device *netdev, bool suspending)
{
        struct igb_adapter *adapter = netdev_priv(netdev);
        struct pci_dev *pdev = adapter->pdev;

        WARN_ON(test_bit(__IGB_RESETTING, &adapter->state));

        if (!suspending)
                pm_runtime_get_sync(&pdev->dev);

        igb_down(adapter);
        igb_free_irq(adapter);

        igb_free_all_tx_resources(adapter);
        igb_free_all_rx_resources(adapter);

        if (!suspending)
                pm_runtime_put_sync(&pdev->dev);
        return 0;
}

static int igb_close(struct net_device *netdev)
{
        return __igb_close(netdev, false);
}

/**
 *  igb_setup_tx_resources - allocate Tx resources (Descriptors)
 *  @tx_ring: tx descriptor ring (for a specific queue) to setup
 *
 *  Return 0 on success, negative on failure
 **/
int igb_setup_tx_resources(struct igb_ring *tx_ring)
{
        struct device *dev = tx_ring->dev;
        int size;

        size = sizeof(struct igb_tx_buffer) * tx_ring->count;

        tx_ring->tx_buffer_info = vzalloc(size);
        if (!tx_ring->tx_buffer_info)
                goto err;

        /* round up to nearest 4K */
        tx_ring->size = tx_ring->count * sizeof(union e1000_adv_tx_desc);
        tx_ring->size = ALIGN(tx_ring->size, 4096);

        tx_ring->desc = dma_alloc_coherent(dev, tx_ring->size,
                                           &tx_ring->dma, GFP_KERNEL);
        if (!tx_ring->desc)
                goto err;

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

        return 0;

err:
        vfree(tx_ring->tx_buffer_info);
        tx_ring->tx_buffer_info = NULL;
        dev_err(dev, "Unable to allocate memory for the Tx descriptor ring\n");
        return -ENOMEM;
}

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

        for (i = 0; i < adapter->num_tx_queues; i++) {
                err = igb_setup_tx_resources(adapter->tx_ring[i]);
                if (err) {
                        dev_err(&pdev->dev,
                                "Allocation for Tx Queue %u failed\n", i);
                        for (i--; i >= 0; i--)
                                igb_free_tx_resources(adapter->tx_ring[i]);
                        break;
                }
        }

        return err;
}

/**
 *  igb_setup_tctl - configure the transmit control registers
 *  @adapter: Board private structure
 **/
void igb_setup_tctl(struct igb_adapter *adapter)
{
        struct e1000_hw *hw = &adapter->hw;
        u32 tctl;

        /* disable queue 0 which is enabled by default on 82575 and 82576 */
        wr32(E1000_TXDCTL(0), 0);

        /* Program the Transmit Control Register */
        tctl = rd32(E1000_TCTL);
        tctl &= ~E1000_TCTL_CT;
        tctl |= E1000_TCTL_PSP | E1000_TCTL_RTLC |
                (E1000_COLLISION_THRESHOLD << E1000_CT_SHIFT);

        igb_config_collision_dist(hw);

        /* Enable transmits */
        tctl |= E1000_TCTL_EN;

        wr32(E1000_TCTL, tctl);
}

/**
 *  igb_configure_tx_ring - Configure transmit ring after Reset
 *  @adapter: board private structure
 *  @ring: tx ring to configure
 *
 *  Configure a transmit ring after a reset.
 **/
void igb_configure_tx_ring(struct igb_adapter *adapter,
                           struct igb_ring *ring)
{
        struct e1000_hw *hw = &adapter->hw;
        u32 txdctl = 0;
        u64 tdba = ring->dma;
        int reg_idx = ring->reg_idx;

        /* disable the queue */
        wr32(E1000_TXDCTL(reg_idx), 0);
        wrfl();
        mdelay(10);

        wr32(E1000_TDLEN(reg_idx),
             ring->count * sizeof(union e1000_adv_tx_desc));
        wr32(E1000_TDBAL(reg_idx),
             tdba & 0x00000000ffffffffULL);
        wr32(E1000_TDBAH(reg_idx), tdba >> 32);

        ring->tail = hw->hw_addr + E1000_TDT(reg_idx);