// SPDX-License-Identifier: GPL-2.0
/* Copyright(c) 2007 - 2018 Intel Corporation. */

#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 <net/pkt_sched.h>
#include <net/pkt_cls.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/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/bpf.h>
#include <linux/bpf_trace.h>
#include <linux/pm_runtime.h>
#include <linux/etherdevice.h>
#ifdef CONFIG_IGB_DCA
#include <linux/dca.h>
#endif
#include <linux/i2c.h>
#include "igb.h"

enum queue_mode {
        QUEUE_MODE_STRICT_PRIORITY,
        QUEUE_MODE_STREAM_RESERVATION,
};

enum tx_queue_prio {
        TX_QUEUE_PRIO_HIGH,
        TX_QUEUE_PRIO_LOW,
};

char igb_driver_name[] = "igb";
static const char igb_driver_string[] =
                                "Intel(R) Gigabit Ethernet Network Driver";
static const char igb_copyright[] =
                                "Copyright (c) 2007-2014 Intel Corporation.";

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

static const struct pci_device_id 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_I210_COPPER_FLASHLESS), board_82575 },
        { PCI_VDEVICE(INTEL, E1000_DEV_ID_I210_SERDES_FLASHLESS), 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);

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 *);
int igb_open(struct net_device *);
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(struct timer_list *);
static void igb_watchdog(struct timer_list *);
static void igb_watchdog_task(struct work_struct *);
static netdev_tx_t igb_xmit_frame(struct sk_buff *skb, struct net_device *);
static void 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, bool set);
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 *, int);
static int 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 *, unsigned int txqueue);
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_index(struct igb_adapter *, u32);
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_flush_mac_table(struct igb_adapter *);
static int igb_available_rars(struct igb_adapter *, u8);
static void igb_set_default_mac_filter(struct igb_adapter *);
static int igb_uc_sync(struct net_device *, const unsigned char *);
static int igb_uc_unsync(struct net_device *, const 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, __be16 vlan_proto);
static int igb_ndo_set_vf_bw(struct net_device *, int, int, int);
static int igb_ndo_set_vf_spoofchk(struct net_device *netdev, int vf,
                                   bool setting);
static int igb_ndo_set_vf_trust(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 *);
static void igb_nfc_filter_exit(struct igb_adapter *adapter);
static void igb_nfc_filter_restore(struct igb_adapter *adapter);

#ifdef CONFIG_PCI_IOV
static int igb_vf_configure(struct igb_adapter *adapter, int vf);
static int igb_pci_enable_sriov(struct pci_dev *dev, int num_vfs);
static int igb_disable_sriov(struct pci_dev *dev);
static int igb_pci_disable_sriov(struct pci_dev *dev);
#endif

static int igb_suspend(struct device *);
static int igb_resume(struct device *);
static int igb_runtime_suspend(struct device *dev);
static int igb_runtime_resume(struct device *dev);
static int igb_runtime_idle(struct device *dev);
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)
};
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_PCI_IOV
static unsigned int max_vfs;
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 v2");

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

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_TDBAL(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 { __le64 a; __le64 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\n");
                pr_info("%-15s %016lX %016lX\n", netdev->name,
                        netdev->state, dev_trans_start(netdev));
        }

        /* 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(rx_ring), true);
                                }
                        }
                }
        }

exit:
        return;
}

/**
 *  igb_get_i2c_data - Reads the I2C SDA data bit
 *  @data: opaque pointer to adapter struct
 *
 *  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);
}

/**
 *  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);
}

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\n", igb_driver_string);
        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);
                }
                fallthrough;
        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;
        }
}

u32 igb_rd32(struct e1000_hw *hw, u32 reg)
{
        struct igb_adapter *igb = container_of(hw, struct igb_adapter, hw);
        u8 __iomem *hw_addr = READ_ONCE(hw->hw_addr);
        u32 value = 0;

        if (E1000_REMOVED(hw_addr))
                return ~value;

        value = readl(&hw_addr[reg]);

        /* reads should not return all F's */
        if (!(~value) && (!reg || !(~readl(hw_addr)))) {
                struct net_device *netdev = igb->netdev;
                hw->hw_addr = NULL;
                netdev_err(netdev, "PCIe link lost\n");
                WARN(pci_device_is_present(igb->pdev),
                     "igb: Failed to read reg 0x%x!\n", reg);
        }

        return value;
}

/**
 *  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->flags & IGB_FLAG_HAS_MSIX) && 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 = BIT(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 = BIT(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 = BIT(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)
{
        unsigned int num_q_vectors = adapter->num_q_vectors;
        struct net_device *netdev = adapter->netdev;
        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;

        if (num_q_vectors > MAX_Q_VECTORS) {
                num_q_vectors = MAX_Q_VECTORS;
                dev_warn(&adapter->pdev->dev,
                         "The number of queue vectors (%d) is higher than max allowed (%d)\n",
                         adapter->num_q_vectors, MAX_Q_VECTORS);
        }
        for (i = 0; i < num_q_vectors; i++) {
                struct igb_q_vector *q_vector = adapter->q_vector[i];

                vector++;

                q_vector->itr_register = adapter->io_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;
}

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

        adapter->q_vector[v_idx] = NULL;

        /* igb_get_stats64() might access the rings on this vector,
         * we must wait a grace period before freeing it.
         */
        if (q_vector)
                kfree_rcu(q_vector, rcu);
}

/**
 *  igb_reset_q_vector - Reset config for interrupt vector
 *  @adapter: board private structure to initialize
 *  @v_idx: Index of vector to be reset
 *
 *  If NAPI is enabled it will delete any references to the
 *  NAPI struct. This is preparation for igb_free_q_vector.
 **/
static void igb_reset_q_vector(struct igb_adapter *adapter, int v_idx)
{
        struct igb_q_vector *q_vector = adapter->q_vector[v_idx];

        /* Coming from igb_set_interrupt_capability, the vectors are not yet
         * allocated. So, q_vector is NULL so we should stop here.
         */
        if (!q_vector)
                return;

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

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

        netif_napi_del(&q_vector->napi);

}

static void igb_reset_interrupt_capability(struct igb_adapter *adapter)
{
        int v_idx = adapter->num_q_vectors;

        if (adapter->flags & IGB_FLAG_HAS_MSIX)
                pci_disable_msix(adapter->pdev);
        else if (adapter->flags & IGB_FLAG_HAS_MSI)
                pci_disable_msi(adapter->pdev);

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

/**
 *  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_reset_q_vector(adapter, 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;
        adapter->flags |= IGB_FLAG_HAS_MSIX;

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

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

        igb_reset_interrupt_capability(adapter);

        /* If we can't do MSI-X, try MSI */
msi_only:
        adapter->flags &= ~IGB_FLAG_HAS_MSIX;
#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_mac_list);
                adapter->vf_mac_list = NULL;
                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_t 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 = struct_size(q_vector, ring, ring_count);

        /* allocate q_vector and rings */
        q_vector = adapter->q_vector[v_idx];
        if (!q_vector) {
                q_vector = kzalloc(size, GFP_KERNEL);
        } else if (size > ksize(q_vector)) {
                kfree_rcu(q_vector, rcu);
                q_vector = kzalloc(size, GFP_KERNEL);
        } else {
                memset(q_vector, 0, size);
        }
        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->io_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;

                ring->cbs_enable = false;
                ring->idleslope = 0;
                ring->sendslope = 0;
                ring->hicredit = 0;
                ring->locredit = 0;

                u64_stats_init(&ring->tx_syncp);
                u64_stats_init(&ring->tx_syncp2);

                /* 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;

                u64_stats_init(&ring->rx_syncp);

                /* 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->flags & IGB_FLAG_HAS_MSIX) {
                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->flags & IGB_FLAG_HAS_MSIX) {
                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->flags & IGB_FLAG_HAS_MSIX) {
                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->flags & IGB_FLAG_HAS_MSIX) {
                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->flags & IGB_FLAG_HAS_MSIX) {
                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 pf_id = adapter->vfs_allocated_count;
        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, pf_id, true, 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, vid, pf_id, false, true);
        }
}

/**
 *  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);
}

static void enable_fqtss(struct igb_adapter *adapter, bool enable)
{
        struct net_device *netdev = adapter->netdev;
        struct e1000_hw *hw = &adapter->hw;

        WARN_ON(hw->mac.type != e1000_i210);

        if (enable)
                adapter->flags |= IGB_FLAG_FQTSS;
        else
                adapter->flags &= ~IGB_FLAG_FQTSS;

        if (netif_running(netdev))
                schedule_work(&adapter->reset_task);
}

static bool is_fqtss_enabled(struct igb_adapter *adapter)
{
        return (adapter->flags & IGB_FLAG_FQTSS) ? true : false;
}

static void set_tx_desc_fetch_prio(struct e1000_hw *hw, int queue,
                                   enum tx_queue_prio prio)
{
        u32 val;

        WARN_ON(hw->mac.type != e1000_i210);
        WARN_ON(queue < 0 || queue > 4);

        val = rd32(E1000_I210_TXDCTL(queue));

        if (prio == TX_QUEUE_PRIO_HIGH)
                val |= E1000_TXDCTL_PRIORITY;
        else
                val &= ~E1000_TXDCTL_PRIORITY;

        wr32(E1000_I210_TXDCTL(queue), val);
}

static void set_queue_mode(struct e1000_hw *hw, int queue, enum queue_mode mode)
{
        u32 val;

        WARN_ON(hw->mac.type != e1000_i210);
        WARN_ON(queue < 0 || queue > 1);

        val = rd32(E1000_I210_TQAVCC(queue));

        if (mode == QUEUE_MODE_STREAM_RESERVATION)
                val |= E1000_TQAVCC_QUEUEMODE;
        else
                val &= ~E1000_TQAVCC_QUEUEMODE;

        wr32(E1000_I210_TQAVCC(queue), val);
}

static bool is_any_cbs_enabled(struct igb_adapter *adapter)
{
        int i;

        for (i = 0; i < adapter->num_tx_queues; i++) {
                if (adapter->tx_ring[i]->cbs_enable)
                        return true;
        }

        return false;
}

static bool is_any_txtime_enabled(struct igb_adapter *adapter)
{
        int i;

        for (i = 0; i < adapter->num_tx_queues; i++) {
                if (adapter->tx_ring[i]->launchtime_enable)
                        return true;
        }

        return false;
}

/**
 *  igb_config_tx_modes - Configure "Qav Tx mode" features on igb
 *  @adapter: pointer to adapter struct
 *  @queue: queue number
 *
 *  Configure CBS and Launchtime for a given hardware queue.
 *  Parameters are retrieved from the correct Tx ring, so
 *  igb_save_cbs_params() and igb_save_txtime_params() should be used
 *  for setting those correctly prior to this function being called.
 **/
static void igb_config_tx_modes(struct igb_adapter *adapter, int queue)
{
        struct net_device *netdev = adapter->netdev;
        struct e1000_hw *hw = &adapter->hw;
        struct igb_ring *ring;
        u32 tqavcc, tqavctrl;
        u16 value;

        WARN_ON(hw->mac.type != e1000_i210);
        WARN_ON(queue < 0 || queue > 1);
        ring = adapter->tx_ring[queue];

        /* If any of the Qav features is enabled, configure queues as SR and
         * with HIGH PRIO. If none is, then configure them with LOW PRIO and
         * as SP.
         */
        if (ring->cbs_enable || ring->launchtime_enable) {
                set_tx_desc_fetch_prio(hw, queue, TX_QUEUE_PRIO_HIGH);
                set_queue_mode(hw, queue, QUEUE_MODE_STREAM_RESERVATION);
        } else {
                set_tx_desc_fetch_prio(hw, queue, TX_QUEUE_PRIO_LOW);
                set_queue_mode(hw, queue, QUEUE_MODE_STRICT_PRIORITY);
        }

        /* If CBS is enabled, set DataTranARB and config its parameters. */
        if (ring->cbs_enable || queue == 0) {
                /* i210 does not allow the queue 0 to be in the Strict
                 * Priority mode while the Qav mode is enabled, so,
                 * instead of disabling strict priority mode, we give
                 * queue 0 the maximum of credits possible.
                 *
                 * See section 8.12.19 of the i210 datasheet, "Note:
                 * Queue0 QueueMode must be set to 1b when
                 * TransmitMode is set to Qav."
                 */
                if (queue == 0 && !ring->cbs_enable) {
                        /* max "linkspeed" idleslope in kbps */
                        ring->idleslope = 1000000;
                        ring->hicredit = ETH_FRAME_LEN;
                }

                /* Always set data transfer arbitration to credit-based
                 * shaper algorithm on TQAVCTRL if CBS is enabled for any of
                 * the queues.
                 */
                tqavctrl = rd32(E1000_I210_TQAVCTRL);
                tqavctrl |= E1000_TQAVCTRL_DATATRANARB;
                wr32(E1000_I210_TQAVCTRL, tqavctrl);

                /* According to i210 datasheet section 7.2.7.7, we should set
                 * the 'idleSlope' field from TQAVCC register following the
                 * equation:
                 *
                 * For 100 Mbps link speed:
                 *
                 *     value = BW * 0x7735 * 0.2                          (E1)
                 *
                 * For 1000Mbps link speed:
                 *
                 *     value = BW * 0x7735 * 2                            (E2)
                 *
                 * E1 and E2 can be merged into one equation as shown below.
                 * Note that 'link-speed' is in Mbps.
                 *
                 *     value = BW * 0x7735 * 2 * link-speed
                 *                           --------------               (E3)
                 *                                1000
                 *
                 * 'BW' is the percentage bandwidth out of full link speed
                 * which can be found with the following equation. Note that
                 * idleSlope here is the parameter from this function which
                 * is in kbps.
                 *
                 *     BW =     idleSlope
                 *          -----------------                             (E4)
                 *          link-speed * 1000
                 *
                 * That said, we can come up with a generic equation to
                 * calculate the value we should set it TQAVCC register by
                 * replacing 'BW' in E3 by E4. The resulting equation is:
                 *
                 * value =     idleSlope     * 0x7735 * 2 * link-speed
                 *         -----------------            --------------    (E5)
                 *         link-speed * 1000                 1000
                 *
                 * 'link-speed' is present in both sides of the fraction so
                 * it is canceled out. The final equation is the following:
                 *
                 *     value = idleSlope * 61034
                 *             -----------------                          (E6)
                 *                  1000000
                 *
                 * NOTE: For i210, given the above, we can see that idleslope
                 *       is represented in 16.38431 kbps units by the value at
                 *       the TQAVCC register (1Gbps / 61034), which reduces
                 *       the granularity for idleslope increments.
                 *       For instance, if you want to configure a 2576kbps
                 *       idleslope, the value to be written on the register
                 *       would have to be 157.23. If rounded down, you end
                 *       up with less bandwidth available than originally
                 *       required (~2572 kbps). If rounded up, you end up
                 *       with a higher bandwidth (~2589 kbps). Below the
                 *       approach we take is to always round up the
                 *       calculated value, so the resulting bandwidth might
                 *       be slightly higher for some configurations.
                 */
                value = DIV_ROUND_UP_ULL(ring->idleslope * 61034ULL, 1000000);

                tqavcc = rd32(E1000_I210_TQAVCC(queue));
                tqavcc &= ~E1000_TQAVCC_IDLESLOPE_MASK;
                tqavcc |= value;
                wr32(E1000_I210_TQAVCC(queue), tqavcc);

                wr32(E1000_I210_TQAVHC(queue),
                     0x80000000 + ring->hicredit * 0x7735);
        } else {

                /* Set idleSlope to zero. */
                tqavcc = rd32(E1000_I210_TQAVCC(queue));
                tqavcc &= ~E1000_TQAVCC_IDLESLOPE_MASK;
                wr32(E1000_I210_TQAVCC(queue), tqavcc);

                /* Set hiCredit to zero. */
                wr32(E1000_I210_TQAVHC(queue), 0);

                /* If CBS is not enabled for any queues anymore, then return to
                 * the default state of Data Transmission Arbitration on
                 * TQAVCTRL.
                 */
                if (!is_any_cbs_enabled(adapter)) {
                        tqavctrl = rd32(E1000_I210_TQAVCTRL);
                        tqavctrl &= ~E1000_TQAVCTRL_DATATRANARB;
                        wr32(E1000_I210_TQAVCTRL, tqavctrl);
                }
        }

        /* If LaunchTime is enabled, set DataTranTIM. */
        if (ring->launchtime_enable) {
                /* Always set DataTranTIM on TQAVCTRL if LaunchTime is enabled
                 * for any of the SR queues, and configure fetchtime delta.
                 * XXX NOTE:
                 *     - LaunchTime will be enabled for all SR queues.
                 *     - A fixed offset can be added relative to the launch
                 *       time of all packets if configured at reg LAUNCH_OS0.
                 *       We are keeping it as 0 for now (default value).
                 */
                tqavctrl = rd32(E1000_I210_TQAVCTRL);
                tqavctrl |= E1000_TQAVCTRL_DATATRANTIM |
                       E1000_TQAVCTRL_FETCHTIME_DELTA;
                wr32(E1000_I210_TQAVCTRL, tqavctrl);
        } else {
                /* If Launchtime is not enabled for any SR queues anymore,
                 * then clear DataTranTIM on TQAVCTRL and clear fetchtime delta,
                 * effectively disabling Launchtime.
                 */
                if (!is_any_txtime_enabled(adapter)) {
                        tqavctrl = rd32(E1000_I210_TQAVCTRL);
                        tqavctrl &= ~E1000_TQAVCTRL_DATATRANTIM;
                        tqavctrl &= ~E1000_TQAVCTRL_FETCHTIME_DELTA;
                        wr32(E1000_I210_TQAVCTRL, tqavctrl);
                }
        }

        /* XXX: In i210 controller the sendSlope and loCredit parameters from
         * CBS are not configurable by software so we don't do any 'controller
         * configuration' in respect to these parameters.
         */

        netdev_dbg(netdev, "Qav Tx mode: cbs %s, launchtime %s, queue %d idleslope %d sendslope %d hiCredit %d locredit %d\n",
                   ring->cbs_enable ? "enabled" : "disabled",
                   ring->launchtime_enable ? "enabled" : "disabled",
                   queue,
                   ring->idleslope, ring->sendslope,
                   ring->hicredit, ring->locredit);
}

static int igb_save_txtime_params(struct igb_adapter *adapter, int queue,
                                  bool enable)
{
        struct igb_ring *ring;

        if (queue < 0 || queue > adapter->num_tx_queues)
                return -EINVAL;

        ring = adapter->tx_ring[queue];
        ring->launchtime_enable = enable;

        return 0;
}

static int igb_save_cbs_params(struct igb_adapter *adapter, int queue,
                               bool enable, int idleslope, int sendslope,
                               int hicredit, int locredit)
{
        struct igb_ring *ring;

        if (queue < 0 || queue > adapter->num_tx_queues)
                return -EINVAL;

        ring = adapter->tx_ring[queue];

        ring->cbs_enable = enable;
        ring->idleslope = idleslope;
        ring->sendslope = sendslope;
        ring->hicredit = hicredit;
        ring->locredit = locredit;

        return 0;
}

/**
 *  igb_setup_tx_mode - Switch to/from Qav Tx mode when applicable
 *  @adapter: pointer to adapter struct
 *
 *  Configure TQAVCTRL register switching the controller's Tx mode
 *  if FQTSS mode is enabled or disabled. Additionally, will issue
 *  a call to igb_config_tx_modes() per queue so any previously saved
 *  Tx parameters are applied.
 **/
static void igb_setup_tx_mode(struct igb_adapter *adapter)
{
        struct net_device *netdev = adapter->netdev;
        struct e1000_hw *hw = &adapter->hw;
        u32 val;

        /* Only i210 controller supports changing the transmission mode. */
        if (hw->mac.type != e1000_i210)
                return;

        if (is_fqtss_enabled(adapter)) {
                int i, max_queue;

                /* Configure TQAVCTRL register: set transmit mode to 'Qav',
                 * set data fetch arbitration to 'round robin', set SP_WAIT_SR
                 * so SP queues wait for SR ones.
                 */
                val = rd32(E1000_I210_TQAVCTRL);
                val |= E1000_TQAVCTRL_XMIT_MODE | E1000_TQAVCTRL_SP_WAIT_SR;
                val &= ~E1000_TQAVCTRL_DATAFETCHARB;
                wr32(E1000_I210_TQAVCTRL, val);

                /* Configure Tx and Rx packet buffers sizes as described in
                 * i210 datasheet section 7.2.7.7.
                 */
                val = rd32(E1000_TXPBS);
                val &= ~I210_TXPBSIZE_MASK;
                val |= I210_TXPBSIZE_PB0_6KB | I210_TXPBSIZE_PB1_6KB |
                        I210_TXPBSIZE_PB2_6KB | I210_TXPBSIZE_PB3_6KB;
                wr32(E1000_TXPBS, val);

                val = rd32(E1000_RXPBS);
                val &= ~I210_RXPBSIZE_MASK;
                val |= I210_RXPBSIZE_PB_30KB;
                wr32(E1000_RXPBS, val);

                /* Section 8.12.9 states that MAX_TPKT_SIZE from DTXMXPKTSZ
                 * register should not exceed the buffer size programmed in
                 * TXPBS. The smallest buffer size programmed in TXPBS is 4kB
                 * so according to the datasheet we should set MAX_TPKT_SIZE to
                 * 4kB / 64.
                 *
                 * However, when we do so, no frame from queue 2 and 3 are
                 * transmitted.  It seems the MAX_TPKT_SIZE should not be great
                 * or _equal_ to the buffer size programmed in TXPBS. For this
                 * reason, we set set MAX_ TPKT_SIZE to (4kB - 1) / 64.
                 */
                val = (4096 - 1) / 64;
                wr32(E1000_I210_DTXMXPKTSZ, val);

                /* Since FQTSS mode is enabled, apply any CBS configuration
                 * previously set. If no previous CBS configuration has been
                 * done, then the initial configuration is applied, which means
                 * CBS is disabled.
                 */
                max_queue = (adapter->num_tx_queues < I210_SR_QUEUES_NUM) ?
                            adapter->num_tx_queues : I210_SR_QUEUES_NUM;

                for (i = 0; i < max_queue; i++) {
                        igb_config_tx_modes(adapter, i);
                }
        } else {
                wr32(E1000_RXPBS, I210_RXPBSIZE_DEFAULT);
                wr32(E1000_TXPBS, I210_TXPBSIZE_DEFAULT);
                wr32(E1000_I210_DTXMXPKTSZ, I210_DTXMXPKTSZ_DEFAULT);

                val = rd32(E1000_I210_TQAVCTRL);
                /* According to Section 8.12.21, the other flags we've set when
                 * enabling FQTSS are not relevant when disabling FQTSS so we
                 * don't set they here.
                 */
                val &= ~E1000_TQAVCTRL_XMIT_MODE;
                wr32(E1000_I210_TQAVCTRL, val);
        }

        netdev_dbg(netdev, "FQTSS %s\n", (is_fqtss_enabled(adapter)) ?
                   "enabled" : "disabled");
}

/**
 *  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_setup_tx_mode(adapter);

        igb_restore_vlan(adapter);

        igb_setup_tctl(adapter);
        igb_setup_mrqc(adapter);

        igb_setup_rctl(adapter);

        igb_nfc_filter_restore(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_setup_link(&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_check_swap_media -  Detect and switch function for Media Auto Sense
 * @adapter: address of the board private structure
 **/
static void igb_check_swap_media(struct igb_adapter *adapter)
{
        struct e1000_hw *hw = &adapter->hw;
        u32 ctrl_ext, connsw;
        bool swap_now = false;

        ctrl_ext = rd32(E1000_CTRL_EXT);
        connsw = rd32(E1000_CONNSW);

        /* need to live swap if current media is copper and we have fiber/serdes
         * to go to.
         */

        if ((hw->phy.media_type == e1000_media_type_copper) &&
            (!(connsw & E1000_CONNSW_AUTOSENSE_EN))) {
                swap_now = true;
        } else if ((hw->phy.media_type != e1000_media_type_copper) &&
                   !(connsw & E1000_CONNSW_SERDESD)) {
                /* copper signal takes time to appear */
                if (adapter->copper_tries < 4) {
                        adapter->copper_tries++;
                        connsw |= E1000_CONNSW_AUTOSENSE_CONF;
                        wr32(E1000_CONNSW, connsw);
                        return;
                } else {
                        adapter->copper_tries = 0;
                        if ((connsw & E1000_CONNSW_PHYSD) &&
                            (!(connsw & E1000_CONNSW_PHY_PDN))) {
                                swap_now = true;
                                connsw &= ~E1000_CONNSW_AUTOSENSE_CONF;
                                wr32(E1000_CONNSW, connsw);
                        }
                }
        }

        if (!swap_now)
                return;

        switch (hw->phy.media_type) {
        case e1000_media_type_copper:
                netdev_info(adapter->netdev,
                        "MAS: changing media to fiber/serdes\n");
                ctrl_ext |=
                        E1000_CTRL_EXT_LINK_MODE_PCIE_SERDES;
                adapter->flags |= IGB_FLAG_MEDIA_RESET;
                adapter->copper_tries = 0;
                break;
        case e1000_media_type_internal_serdes:
        case e1000_media_type_fiber:
                netdev_info(adapter->netdev,
                        "MAS: changing media to copper\n");
                ctrl_ext &=
                        ~E1000_CTRL_EXT_LINK_MODE_PCIE_SERDES;
                adapter->flags |= IGB_FLAG_MEDIA_RESET;
                break;
        default:
                /* shouldn't get here during regular operation */
                netdev_err(adapter->netdev,
                        "AMS: Invalid media type found, returning\n");
                break;
        }
        wr32(E1000_CTRL_EXT, ctrl_ext);
}

/**
 *  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->flags & IGB_FLAG_HAS_MSIX)
                igb_configure_msix(adapter);
        else
                igb_assign_vector(adapter->q_vector[0], 0);

        /* Clear any pending interrupts. */
        rd32(E1000_TSICR);
        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);

        if ((adapter->flags & IGB_FLAG_EEE) &&
            (!hw->dev_spec._82575.eee_disable))
                adapter->eee_advert = MDIO_EEE_100TX | MDIO_EEE_1000T;

        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 */

        igb_nfc_filter_exit(adapter);

        netif_carrier_off(netdev);
        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();
        usleep_range(10000, 11000);

        igb_irq_disable(adapter);

        adapter->flags &= ~IGB_FLAG_NEED_LINK_UPDATE;

        for (i = 0; i < adapter->num_q_vectors; i++) {
                if (adapter->q_vector[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);

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

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

        if (!pci_channel_offline(adapter->pdev))
                igb_reset(adapter);

        /* clear VLAN promisc flag so VFTA will be updated if necessary */
        adapter->flags &= ~IGB_FLAG_VLAN_PROMISC;

        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)
{
        while (test_and_set_bit(__IGB_RESETTING, &adapter->state))
                usleep_range(1000, 2000);
        igb_down(adapter);
        igb_up(adapter);
        clear_bit(__IGB_RESETTING, &adapter->state);
}

/** igb_enable_mas - Media Autosense re-enable after swap
 *
 * @adapter: adapter struct
 **/
static void igb_enable_mas(struct igb_adapter *adapter)
{
        struct e1000_hw *hw = &adapter->hw;
        u32 connsw = rd32(E1000_CONNSW);

        /* configure for SerDes media detect */
        if ((hw->phy.media_type == e1000_media_type_copper) &&
            (!(connsw & E1000_CONNSW_SERDESD))) {
                connsw |= E1000_CONNSW_ENRGSRC;
                connsw |= E1000_CONNSW_AUTOSENSE_EN;
                wr32(E1000_CONNSW, connsw);
                wrfl();
        }
}

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, 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 (mac->type == e1000_82575) {
                u32 min_rx_space, min_tx_space, needed_tx_space;

                /* write Rx PBA so that hardware can report correct Tx PBA */
                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.
                 */
                min_rx_space = DIV_ROUND_UP(MAX_JUMBO_FRAME_SIZE, 1024);

                /* The Tx FIFO also stores 16 bytes of information about the Tx
                 * but don't include Ethernet FCS because hardware appends it.
                 * We only need to round down to the nearest 512 byte block
                 * count since the value we care about is 2 frames, not 1.
                 */
                min_tx_space = adapter->max_frame_size;
                min_tx_space += sizeof(union e1000_adv_tx_desc) - ETH_FCS_LEN;
                min_tx_space = DIV_ROUND_UP(min_tx_space, 512);

                /* upper 16 bits has Tx packet buffer allocation size in KB */
                needed_tx_space = min_tx_space - (rd32(E1000_PBA) >> 16);

                /* 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 (needed_tx_space < pba) {
                        pba -= needed_tx_space;

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

                /* adjust PBA for jumbo frames */
                wr32(E1000_PBA, pba);
        }

        /* flow control settings
         * The high water mark must be low enough to fit one full frame
         * after transmitting the pause frame.  As such we must have enough
         * space to allow for us to complete our current transmit and then
         * receive the frame that is in progress from the link partner.
         * Set it to:
         * - the full Rx FIFO size minus one full Tx plus one full Rx frame
         */
        hwm = (pba << 10) - (adapter->max_frame_size + MAX_JUMBO_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 (adapter->flags & IGB_FLAG_MEDIA_RESET) {
                /* need to resetup here after media swap */
                adapter->ei.get_invariants(hw);
                adapter->flags &= ~IGB_FLAG_MEDIA_RESET;
        }
        if ((mac->type == e1000_82575 || mac->type == e1000_i350) &&
            (adapter->flags & IGB_FLAG_MAS_ENABLE)) {
                igb_enable_mas(adapter);
        }
        if (hw->mac.ops.init_hw(hw))
                dev_err(&pdev->dev, "Hardware Error\n");

        /* RAR registers were cleared during init_hw, clear mac table */
        igb_flush_mac_table(adapter);
        __dev_uc_unsync(adapter->netdev, NULL);

        /* Recover default RAR entry */
        igb_set_default_mac_filter(adapter);

        /* 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
        /* Re-establish EEE setting */
        if (hw->phy.media_type == e1000_media_type_copper) {
                switch (mac->type) {
                case e1000_i350:
                case e1000_i210:
                case e1000_i211:
                        igb_set_eee_i350(hw, true, true);
                        break;
                case e1000_i354:
                        igb_set_eee_i354(hw, true, true);
                        break;
                default:
                        break;
                }
        }
        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. */
        if (adapter->ptp_flags & IGB_PTP_ENABLED)
                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 | NETIF_F_NTUPLE)))
                return 0;

        if (!(features & NETIF_F_NTUPLE)) {
                struct hlist_node *node2;
                struct igb_nfc_filter *rule;

                spin_lock(&adapter->nfc_lock);
                hlist_for_each_entry_safe(rule, node2,
                                          &adapter->nfc_filter_list, nfc_node) {
                        igb_erase_filter(adapter, rule);
                        hlist_del(&rule->nfc_node);
                        kfree(rule);
                }
                spin_unlock(&adapter->nfc_lock);
                adapter->nfc_filter_count = 0;
        }

        netdev->features = features;

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

        return 1;
}

static int igb_ndo_fdb_add(struct ndmsg *ndm, struct nlattr *tb[],
                           struct net_device *dev,
                           const unsigned char *addr, u16 vid,
                           u16 flags,
                           struct netlink_ext_ack *extack)
{
        /* guarantee we can provide a unique filter for the unicast address */
        if (is_unicast_ether_addr(addr) || is_link_local_ether_addr(addr)) {
                struct igb_adapter *adapter = netdev_priv(dev);
                int vfn = adapter->vfs_allocated_count;

                if (netdev_uc_count(dev) >= igb_available_rars(adapter, vfn))
                        return -ENOMEM;
        }

        return ndo_dflt_fdb_add(ndm, tb, dev, addr, vid, flags);
}

#define IGB_MAX_MAC_HDR_LEN     127
#define IGB_MAX_NETWORK_HDR_LEN 511

static netdev_features_t
igb_features_check(struct sk_buff *skb, struct net_device *dev,
                   netdev_features_t features)
{
        unsigned int network_hdr_len, mac_hdr_len;

        /* Make certain the headers can be described by a context descriptor */
        mac_hdr_len = skb_network_header(skb) - skb->data;
        if (unlikely(mac_hdr_len > IGB_MAX_MAC_HDR_LEN))
                return features & ~(NETIF_F_HW_CSUM |
                                    NETIF_F_SCTP_CRC |
                                    NETIF_F_GSO_UDP_L4 |
                                    NETIF_F_HW_VLAN_CTAG_TX |
                                    NETIF_F_TSO |
                                    NETIF_F_TSO6);

        network_hdr_len = skb_checksum_start(skb) - skb_network_header(skb);
        if (unlikely(network_hdr_len >  IGB_MAX_NETWORK_HDR_LEN))
                return features & ~(NETIF_F_HW_CSUM |
                                    NETIF_F_SCTP_CRC |
                                    NETIF_F_GSO_UDP_L4 |
                                    NETIF_F_TSO |
                                    NETIF_F_TSO6);

        /* We can only support IPV4 TSO in tunnels if we can mangle the
         * inner IP ID field, so strip TSO if MANGLEID is not supported.
         */
        if (skb->encapsulation && !(features & NETIF_F_TSO_MANGLEID))
                features &= ~NETIF_F_TSO;

        return features;
}

static void igb_offload_apply(struct igb_adapter *adapter, s32 queue)
{
        if (!is_fqtss_enabled(adapter)) {
                enable_fqtss(adapter, true);
                return;
        }

        igb_config_tx_modes(adapter, queue);

        if (!is_any_cbs_enabled(adapter) && !is_any_txtime_enabled(adapter))
                enable_fqtss(adapter, false);
}

static int igb_offload_cbs(struct igb_adapter *adapter,
                           struct tc_cbs_qopt_offload *qopt)
{
        struct e1000_hw *hw = &adapter->hw;
        int err;

        /* CBS offloading is only supported by i210 controller. */
        if (hw->mac.type != e1000_i210)
                return -EOPNOTSUPP;

        /* CBS offloading is only supported by queue 0 and queue 1. */
        if (qopt->queue < 0 || qopt->queue > 1)
                return -EINVAL;

        err = igb_save_cbs_params(adapter, qopt->queue, qopt->enable,
                                  qopt->idleslope, qopt->sendslope,
                                  qopt->hicredit, qopt->locredit);
        if (err)
                return err;

        igb_offload_apply(adapter, qopt->queue);

        return 0;
}

#define ETHER_TYPE_FULL_MASK ((__force __be16)~0)
#define VLAN_PRIO_FULL_MASK (0x07)

static int igb_parse_cls_flower(struct igb_adapter *adapter,
                                struct flow_cls_offload *f,
                                int traffic_class,
                                struct igb_nfc_filter *input)
{
        struct flow_rule *rule = flow_cls_offload_flow_rule(f);
        struct flow_dissector *dissector = rule->match.dissector;
        struct netlink_ext_ack *extack = f->common.extack;

        if (dissector->used_keys &
            ~(BIT(FLOW_DISSECTOR_KEY_BASIC) |
              BIT(FLOW_DISSECTOR_KEY_CONTROL) |
              BIT(FLOW_DISSECTOR_KEY_ETH_ADDRS) |
              BIT(FLOW_DISSECTOR_KEY_VLAN))) {
                NL_SET_ERR_MSG_MOD(extack,
                                   "Unsupported key used, only BASIC, CONTROL, ETH_ADDRS and VLAN are supported");
                return -EOPNOTSUPP;
        }

        if (flow_rule_match_key(rule, FLOW_DISSECTOR_KEY_ETH_ADDRS)) {
                struct flow_match_eth_addrs match;

                flow_rule_match_eth_addrs(rule, &match);
                if (!is_zero_ether_addr(match.mask->dst)) {
                        if (!is_broadcast_ether_addr(match.mask->dst)) {
                                NL_SET_ERR_MSG_MOD(extack, "Only full masks are supported for destination MAC address");
                                return -EINVAL;
                        }

                        input->filter.match_flags |=
                                IGB_FILTER_FLAG_DST_MAC_ADDR;
                        ether_addr_copy(input->filter.dst_addr, match.key->dst);
                }

                if (!is_zero_ether_addr(match.mask->src)) {
                        if (!is_broadcast_ether_addr(match.mask->src)) {
                                NL_SET_ERR_MSG_MOD(extack, "Only full masks are supported for source MAC address");
                                return -EINVAL;
                        }

                        input->filter.match_flags |=
                                IGB_FILTER_FLAG_SRC_MAC_ADDR;
                        ether_addr_copy(input->filter.src_addr, match.key->src);
                }
        }

        if (flow_rule_match_key(rule, FLOW_DISSECTOR_KEY_BASIC)) {
                struct flow_match_basic match;

                flow_rule_match_basic(rule, &match);
                if (match.mask->n_proto) {
                        if (match.mask->n_proto != ETHER_TYPE_FULL_MASK) {
                                NL_SET_ERR_MSG_MOD(extack, "Only full mask is supported for EtherType filter");
                                return -EINVAL;
                        }

                        input->filter.match_flags |= IGB_FILTER_FLAG_ETHER_TYPE;
                        input->filter.etype = match.key->n_proto;
                }
        }

        if (flow_rule_match_key(rule, FLOW_DISSECTOR_KEY_VLAN)) {
                struct flow_match_vlan match;

                flow_rule_match_vlan(rule, &match);
                if (match.mask->vlan_priority) {
                        if (match.mask->vlan_priority != VLAN_PRIO_FULL_MASK) {
                                NL_SET_ERR_MSG_MOD(extack, "Only full mask is supported for VLAN priority");
                                return -EINVAL;
                        }

                        input->filter.match_flags |= IGB_FILTER_FLAG_VLAN_TCI;
                        input->filter.vlan_tci =
                                (__force __be16)match.key->vlan_priority;
                }
        }

        input->action = traffic_class;
        input->cookie = f->cookie;

        return 0;
}

static int igb_configure_clsflower(struct igb_adapter *adapter,
                                   struct flow_cls_offload *cls_flower)
{
        struct netlink_ext_ack *extack = cls_flower->common.extack;
        struct igb_nfc_filter *filter, *f;
        int err, tc;

        tc = tc_classid_to_hwtc(adapter->netdev, cls_flower->classid);
        if (tc < 0) {
                NL_SET_ERR_MSG_MOD(extack, "Invalid traffic class");
                return -EINVAL;
        }

        filter = kzalloc(sizeof(*filter), GFP_KERNEL);
        if (!filter)
                return -ENOMEM;

        err = igb_parse_cls_flower(adapter, cls_flower, tc, filter);
        if (err < 0)
                goto err_parse;

        spin_lock(&adapter->nfc_lock);

        hlist_for_each_entry(f, &adapter->nfc_filter_list, nfc_node) {
                if (!memcmp(&f->filter, &filter->filter, sizeof(f->filter))) {
                        err = -EEXIST;
                        NL_SET_ERR_MSG_MOD(extack,
                                           "This filter is already set in ethtool");
                        goto err_locked;
                }
        }

        hlist_for_each_entry(f, &adapter->cls_flower_list, nfc_node) {
                if (!memcmp(&f->filter, &filter->filter, sizeof(f->filter))) {
                        err = -EEXIST;
                        NL_SET_ERR_MSG_MOD(extack,
                                           "This filter is already set in cls_flower");
                        goto err_locked;
                }
        }

        err = igb_add_filter(adapter, filter);
        if (err < 0) {
                NL_SET_ERR_MSG_MOD(extack, "Could not add filter to the adapter");
                goto err_locked;
        }

        hlist_add_head(&filter->nfc_node, &adapter->cls_flower_list);

        spin_unlock(&adapter->nfc_lock);

        return 0;

err_locked:
        spin_unlock(&adapter->nfc_lock);

err_parse:
        kfree(filter);

        return err;
}

static int igb_delete_clsflower(struct igb_adapter *adapter,
                                struct flow_cls_offload *cls_flower)
{
        struct igb_nfc_filter *filter;
        int err;

        spin_lock(&adapter->nfc_lock);

        hlist_for_each_entry(filter, &adapter->cls_flower_list, nfc_node)
                if (filter->cookie == cls_flower->cookie)
                        break;

        if (!filter) {
                err = -ENOENT;
                goto out;
        }

        err = igb_erase_filter(adapter, filter);
        if (err < 0)
                goto out;

        hlist_del(&filter->nfc_node);
        kfree(filter);

out:
        spin_unlock(&adapter->nfc_lock);

        return err;
}

static int igb_setup_tc_cls_flower(struct igb_adapter *adapter,
                                   struct flow_cls_offload *cls_flower)
{
        switch (cls_flower->command) {
        case FLOW_CLS_REPLACE:
                return igb_configure_clsflower(adapter, cls_flower);
        case FLOW_CLS_DESTROY:
                return igb_delete_clsflower(adapter, cls_flower);
        case FLOW_CLS_STATS:
                return -EOPNOTSUPP;
        default:
                return -EOPNOTSUPP;
        }
}

static int igb_setup_tc_block_cb(enum tc_setup_type type, void *type_data,
                                 void *cb_priv)
{
        struct igb_adapter *adapter = cb_priv;

        if (!tc_cls_can_offload_and_chain0(adapter->netdev, type_data))
                return -EOPNOTSUPP;

        switch (type) {
        case TC_SETUP_CLSFLOWER:
                return igb_setup_tc_cls_flower(adapter, type_data);

        default:
                return -EOPNOTSUPP;
        }
}

static int igb_offload_txtime(struct igb_adapter *adapter,
                              struct tc_etf_qopt_offload *qopt)
{
        struct e1000_hw *hw = &adapter->hw;
        int err;

        /* Launchtime offloading is only supported by i210 controller. */
        if (hw->mac.type != e1000_i210)
                return -EOPNOTSUPP;

        /* Launchtime offloading is only supported by queues 0 and 1. */
        if (qopt->queue < 0 || qopt->queue > 1)
                return -EINVAL;

        err = igb_save_txtime_params(adapter, qopt->queue, qopt->enable);
        if (err)
                return err;

        igb_offload_apply(adapter, qopt->queue);

        return 0;
}

static LIST_HEAD(igb_block_cb_list);

static int igb_setup_tc(struct net_device *dev, enum tc_setup_type type,
                        void *type_data)
{
        struct igb_adapter *adapter = netdev_priv(dev);

        switch (type) {
        case TC_SETUP_QDISC_CBS:
                return igb_offload_cbs(adapter, type_data);
        case TC_SETUP_BLOCK:
                return flow_block_cb_setup_simple(type_data,
                                                  &igb_block_cb_list,
                                                  igb_setup_tc_block_cb,
                                                  adapter, adapter, true);

        case TC_SETUP_QDISC_ETF:
                return igb_offload_txtime(adapter, type_data);

        default:
                return -EOPNOTSUPP;
        }
}

static int igb_xdp_setup(struct net_device *dev, struct netdev_bpf *bpf)
{
        int i, frame_size = dev->mtu + IGB_ETH_PKT_HDR_PAD;
        struct igb_adapter *adapter = netdev_priv(dev);
        struct bpf_prog *prog = bpf->prog, *old_prog;
        bool running = netif_running(dev);
        bool need_reset;

        /* verify igb ring attributes are sufficient for XDP */
        for (i = 0; i < adapter->num_rx_queues; i++) {
                struct igb_ring *ring = adapter->rx_ring[i];

                if (frame_size > igb_rx_bufsz(ring)) {
                        NL_SET_ERR_MSG_MOD(bpf->extack,
                                           "The RX buffer size is too small for the frame size");
                        netdev_warn(dev, "XDP RX buffer size %d is too small for the frame size %d\n",
                                    igb_rx_bufsz(ring), frame_size);
                        return -EINVAL;
                }
        }

        old_prog = xchg(&adapter->xdp_prog, prog);
        need_reset = (!!prog != !!old_prog);

        /* device is up and bpf is added/removed, must setup the RX queues */
        if (need_reset && running) {
                igb_close(dev);
        } else {
                for (i = 0; i < adapter->num_rx_queues; i++)
                        (void)xchg(&adapter->rx_ring[i]->xdp_prog,
                            adapter->xdp_prog);
        }

        if (old_prog)
                bpf_prog_put(old_prog);

        /* bpf is just replaced, RXQ and MTU are already setup */
        if (!need_reset)
                return 0;

        if (running)
                igb_open(dev);

        return 0;
}

static int igb_xdp(struct net_device *dev, struct netdev_bpf *xdp)
{
        switch (xdp->command) {
        case XDP_SETUP_PROG:
                return igb_xdp_setup(dev, xdp);
        default:
                return -EINVAL;
        }
}

static void igb_xdp_ring_update_tail(struct igb_ring *ring)
{
        /* Force memory writes to complete before letting h/w know there
         * are new descriptors to fetch.
         */
        wmb();
        writel(ring->next_to_use, ring->tail);
}

static struct igb_ring *igb_xdp_tx_queue_mapping(struct igb_adapter *adapter)
{
        unsigned int r_idx = smp_processor_id();

        if (r_idx >= adapter->num_tx_queues)
                r_idx = r_idx % adapter->num_tx_queues;

        return adapter->tx_ring[r_idx];
}

static int igb_xdp_xmit_back(struct igb_adapter *adapter, struct xdp_buff *xdp)
{
        struct xdp_frame *xdpf = xdp_convert_buff_to_frame(xdp);
        int cpu = smp_processor_id();
        struct igb_ring *tx_ring;
        struct netdev_queue *nq;
        u32 ret;

        if (unlikely(!xdpf))
                return IGB_XDP_CONSUMED;

        /* During program transitions its possible adapter->xdp_prog is assigned
         * but ring has not been configured yet. In this case simply abort xmit.
         */
        tx_ring = adapter->xdp_prog ? igb_xdp_tx_queue_mapping(adapter) : NULL;
        if (unlikely(!tx_ring))
                return IGB_XDP_CONSUMED;

        nq = txring_txq(tx_ring);
        __netif_tx_lock(nq, cpu);
        /* Avoid transmit queue timeout since we share it with the slow path */
        nq->trans_start = jiffies;
        ret = igb_xmit_xdp_ring(adapter, tx_ring, xdpf);
        __netif_tx_unlock(nq);

        return ret;
}

static int igb_xdp_xmit(struct net_device *dev, int n,
                        struct xdp_frame **frames, u32 flags)
{
        struct igb_adapter *adapter = netdev_priv(dev);
        int cpu = smp_processor_id();
        struct igb_ring *tx_ring;
        struct netdev_queue *nq;
        int nxmit = 0;
        int i;

        if (unlikely(test_bit(__IGB_DOWN, &adapter->state)))
                return -ENETDOWN;

        if (unlikely(flags & ~XDP_XMIT_FLAGS_MASK))
                return -EINVAL;

        /* During program transitions its possible adapter->xdp_prog is assigned
         * but ring has not been configured yet. In this case simply abort xmit.
         */
        tx_ring = adapter->xdp_prog ? igb_xdp_tx_queue_mapping(adapter) : NULL;
        if (unlikely(!tx_ring))
                return -ENXIO;

        nq = txring_txq(tx_ring);
        __netif_tx_lock(nq, cpu);

        /* Avoid transmit queue timeout since we share it with the slow path */
        nq->trans_start = jiffies;

        for (i = 0; i < n; i++) {
                struct xdp_frame *xdpf = frames[i];
                int err;

                err = igb_xmit_xdp_ring(adapter, tx_ring, xdpf);
                if (err != IGB_XDP_TX)
                        break;
                nxmit++;
        }

        __netif_tx_unlock(nq);

        if (unlikely(flags & XDP_XMIT_FLUSH))
                igb_xdp_ring_update_tail(tx_ring);

        return nxmit;
}

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_eth_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,