// SPDX-License-Identifier: GPL-2.0
/* Copyright(c) 2013 - 2019 Intel Corporation. */

#include <linux/module.h>
#include <linux/interrupt.h>
#include <linux/aer.h>

#include "fm10k.h"

static const struct fm10k_info *fm10k_info_tbl[] = {
        [fm10k_device_pf] = &fm10k_pf_info,
        [fm10k_device_vf] = &fm10k_vf_info,
};

/*
 * fm10k_pci_tbl - PCI Device ID Table
 *
 * Wildcard entries (PCI_ANY_ID) should come last
 * Last entry must be all 0s
 *
 * { Vendor ID, Device ID, SubVendor ID, SubDevice ID,
 *   Class, Class Mask, private data (not used) }
 */
static const struct pci_device_id fm10k_pci_tbl[] = {
        { PCI_VDEVICE(INTEL, FM10K_DEV_ID_PF), fm10k_device_pf },
        { PCI_VDEVICE(INTEL, FM10K_DEV_ID_SDI_FM10420_QDA2), fm10k_device_pf },
        { PCI_VDEVICE(INTEL, FM10K_DEV_ID_SDI_FM10420_DA2), fm10k_device_pf },
        { PCI_VDEVICE(INTEL, FM10K_DEV_ID_VF), fm10k_device_vf },
        /* required last entry */
        { 0, }
};
MODULE_DEVICE_TABLE(pci, fm10k_pci_tbl);

u16 fm10k_read_pci_cfg_word(struct fm10k_hw *hw, u32 reg)
{
        struct fm10k_intfc *interface = hw->back;
        u16 value = 0;

        if (FM10K_REMOVED(hw->hw_addr))
                return ~value;

        pci_read_config_word(interface->pdev, reg, &value);
        if (value == 0xFFFF)
                fm10k_write_flush(hw);

        return value;
}

u32 fm10k_read_reg(struct fm10k_hw *hw, int reg)
{
        u32 __iomem *hw_addr = READ_ONCE(hw->hw_addr);
        u32 value = 0;

        if (FM10K_REMOVED(hw_addr))
                return ~value;

        value = readl(&hw_addr[reg]);
        if (!(~value) && (!reg || !(~readl(hw_addr)))) {
                struct fm10k_intfc *interface = hw->back;
                struct net_device *netdev = interface->netdev;

                hw->hw_addr = NULL;
                netif_device_detach(netdev);
                netdev_err(netdev, "PCIe link lost, device now detached\n");
        }

        return value;
}

static int fm10k_hw_ready(struct fm10k_intfc *interface)
{
        struct fm10k_hw *hw = &interface->hw;

        fm10k_write_flush(hw);

        return FM10K_REMOVED(hw->hw_addr) ? -ENODEV : 0;
}

/**
 * fm10k_macvlan_schedule - Schedule MAC/VLAN queue task
 * @interface: fm10k private interface structure
 *
 * Schedule the MAC/VLAN queue monitor task. If the MAC/VLAN task cannot be
 * started immediately, request that it be restarted when possible.
 */
void fm10k_macvlan_schedule(struct fm10k_intfc *interface)
{
        /* Avoid processing the MAC/VLAN queue when the service task is
         * disabled, or when we're resetting the device.
         */
        if (!test_bit(__FM10K_MACVLAN_DISABLE, interface->state) &&
            !test_and_set_bit(__FM10K_MACVLAN_SCHED, interface->state)) {
                clear_bit(__FM10K_MACVLAN_REQUEST, interface->state);
                /* We delay the actual start of execution in order to allow
                 * multiple MAC/VLAN updates to accumulate before handling
                 * them, and to allow some time to let the mailbox drain
                 * between runs.
                 */
                queue_delayed_work(fm10k_workqueue,
                                   &interface->macvlan_task, 10);
        } else {
                set_bit(__FM10K_MACVLAN_REQUEST, interface->state);
        }
}

/**
 * fm10k_stop_macvlan_task - Stop the MAC/VLAN queue monitor
 * @interface: fm10k private interface structure
 *
 * Wait until the MAC/VLAN queue task has stopped, and cancel any future
 * requests.
 */
static void fm10k_stop_macvlan_task(struct fm10k_intfc *interface)
{
        /* Disable the MAC/VLAN work item */
        set_bit(__FM10K_MACVLAN_DISABLE, interface->state);

        /* Make sure we waited until any current invocations have stopped */
        cancel_delayed_work_sync(&interface->macvlan_task);

        /* We set the __FM10K_MACVLAN_SCHED bit when we schedule the task.
         * However, it may not be unset of the MAC/VLAN task never actually
         * got a chance to run. Since we've canceled the task here, and it
         * cannot be rescheuled right now, we need to ensure the scheduled bit
         * gets unset.
         */
        clear_bit(__FM10K_MACVLAN_SCHED, interface->state);
}

/**
 * fm10k_resume_macvlan_task - Restart the MAC/VLAN queue monitor
 * @interface: fm10k private interface structure
 *
 * Clear the __FM10K_MACVLAN_DISABLE bit and, if a request occurred, schedule
 * the MAC/VLAN work monitor.
 */
static void fm10k_resume_macvlan_task(struct fm10k_intfc *interface)
{
        /* Re-enable the MAC/VLAN work item */
        clear_bit(__FM10K_MACVLAN_DISABLE, interface->state);

        /* We might have received a MAC/VLAN request while disabled. If so,
         * kick off the queue now.
         */
        if (test_bit(__FM10K_MACVLAN_REQUEST, interface->state))
                fm10k_macvlan_schedule(interface);
}

void fm10k_service_event_schedule(struct fm10k_intfc *interface)
{
        if (!test_bit(__FM10K_SERVICE_DISABLE, interface->state) &&
            !test_and_set_bit(__FM10K_SERVICE_SCHED, interface->state)) {
                clear_bit(__FM10K_SERVICE_REQUEST, interface->state);
                queue_work(fm10k_workqueue, &interface->service_task);
        } else {
                set_bit(__FM10K_SERVICE_REQUEST, interface->state);
        }
}

static void fm10k_service_event_complete(struct fm10k_intfc *interface)
{
        WARN_ON(!test_bit(__FM10K_SERVICE_SCHED, interface->state));

        /* flush memory to make sure state is correct before next watchog */
        smp_mb__before_atomic();
        clear_bit(__FM10K_SERVICE_SCHED, interface->state);

        /* If a service event was requested since we started, immediately
         * re-schedule now. This ensures we don't drop a request until the
         * next timer event.
         */
        if (test_bit(__FM10K_SERVICE_REQUEST, interface->state))
                fm10k_service_event_schedule(interface);
}

static void fm10k_stop_service_event(struct fm10k_intfc *interface)
{
        set_bit(__FM10K_SERVICE_DISABLE, interface->state);
        cancel_work_sync(&interface->service_task);

        /* It's possible that cancel_work_sync stopped the service task from
         * running before it could actually start. In this case the
         * __FM10K_SERVICE_SCHED bit will never be cleared. Since we know that
         * the service task cannot be running at this point, we need to clear
         * the scheduled bit, as otherwise the service task may never be
         * restarted.
         */
        clear_bit(__FM10K_SERVICE_SCHED, interface->state);
}

static void fm10k_start_service_event(struct fm10k_intfc *interface)
{
        clear_bit(__FM10K_SERVICE_DISABLE, interface->state);
        fm10k_service_event_schedule(interface);
}

/**
 * fm10k_service_timer - Timer Call-back
 * @t: pointer to timer data
 **/
static void fm10k_service_timer(struct timer_list *t)
{
        struct fm10k_intfc *interface = from_timer(interface, t,
                                                   service_timer);

        /* Reset the timer */
        mod_timer(&interface->service_timer, (HZ * 2) + jiffies);

        fm10k_service_event_schedule(interface);
}

/**
 * fm10k_prepare_for_reset - Prepare the driver and device for a pending reset
 * @interface: fm10k private data structure
 *
 * This function prepares for a device reset by shutting as much down as we
 * can. It does nothing and returns false if __FM10K_RESETTING was already set
 * prior to calling this function. It returns true if it actually did work.
 */
static bool fm10k_prepare_for_reset(struct fm10k_intfc *interface)
{
        struct net_device *netdev = interface->netdev;

        WARN_ON(in_interrupt());

        /* put off any impending NetWatchDogTimeout */
        netif_trans_update(netdev);

        /* Nothing to do if a reset is already in progress */
        if (test_and_set_bit(__FM10K_RESETTING, interface->state))
                return false;

        /* As the MAC/VLAN task will be accessing registers it must not be
         * running while we reset. Although the task will not be scheduled
         * once we start resetting it may already be running
         */
        fm10k_stop_macvlan_task(interface);

        rtnl_lock();

        fm10k_iov_suspend(interface->pdev);

        if (netif_running(netdev))
                fm10k_close(netdev);

        fm10k_mbx_free_irq(interface);

        /* free interrupts */
        fm10k_clear_queueing_scheme(interface);

        /* delay any future reset requests */
        interface->last_reset = jiffies + (10 * HZ);

        rtnl_unlock();

        return true;
}

static int fm10k_handle_reset(struct fm10k_intfc *interface)
{
        struct net_device *netdev = interface->netdev;
        struct fm10k_hw *hw = &interface->hw;
        int err;

        WARN_ON(!test_bit(__FM10K_RESETTING, interface->state));

        rtnl_lock();

        pci_set_master(interface->pdev);

        /* reset and initialize the hardware so it is in a known state */
        err = hw->mac.ops.reset_hw(hw);
        if (err) {
                dev_err(&interface->pdev->dev, "reset_hw failed: %d\n", err);
                goto reinit_err;
        }

        err = hw->mac.ops.init_hw(hw);
        if (err) {
                dev_err(&interface->pdev->dev, "init_hw failed: %d\n", err);
                goto reinit_err;
        }

        err = fm10k_init_queueing_scheme(interface);
        if (err) {
                dev_err(&interface->pdev->dev,
                        "init_queueing_scheme failed: %d\n", err);
                goto reinit_err;
        }

        /* re-associate interrupts */
        err = fm10k_mbx_request_irq(interface);
        if (err)
                goto err_mbx_irq;

        err = fm10k_hw_ready(interface);
        if (err)
                goto err_open;

        /* update hardware address for VFs if perm_addr has changed */
        if (hw->mac.type == fm10k_mac_vf) {
                if (is_valid_ether_addr(hw->mac.perm_addr)) {
                        ether_addr_copy(hw->mac.addr, hw->mac.perm_addr);
                        ether_addr_copy(netdev->perm_addr, hw->mac.perm_addr);
                        ether_addr_copy(netdev->dev_addr, hw->mac.perm_addr);
                        netdev->addr_assign_type &= ~NET_ADDR_RANDOM;
                }

                if (hw->mac.vlan_override)
                        netdev->features &= ~NETIF_F_HW_VLAN_CTAG_RX;
                else
                        netdev->features |= NETIF_F_HW_VLAN_CTAG_RX;
        }

        err = netif_running(netdev) ? fm10k_open(netdev) : 0;
        if (err)
                goto err_open;

        fm10k_iov_resume(interface->pdev);

        rtnl_unlock();

        fm10k_resume_macvlan_task(interface);

        clear_bit(__FM10K_RESETTING, interface->state);

        return err;
err_open:
        fm10k_mbx_free_irq(interface);
err_mbx_irq:
        fm10k_clear_queueing_scheme(interface);
reinit_err:
        netif_device_detach(netdev);

        rtnl_unlock();

        clear_bit(__FM10K_RESETTING, interface->state);

        return err;
}

static void fm10k_detach_subtask(struct fm10k_intfc *interface)
{
        struct net_device *netdev = interface->netdev;
        u32 __iomem *hw_addr;
        u32 value;

        /* do nothing if netdev is still present or hw_addr is set */
        if (netif_device_present(netdev) || interface->hw.hw_addr)
                return;

        /* We've lost the PCIe register space, and can no longer access the
         * device. Shut everything except the detach subtask down and prepare
         * to reset the device in case we recover. If we actually prepare for
         * reset, indicate that we're detached.
         */
        if (fm10k_prepare_for_reset(interface))
                set_bit(__FM10K_RESET_DETACHED, interface->state);

        /* check the real address space to see if we've recovered */
        hw_addr = READ_ONCE(interface->uc_addr);
        value = readl(hw_addr);
        if (~value) {
                int err;

                /* Make sure the reset was initiated because we detached,
                 * otherwise we might race with a different reset flow.
                 */
                if (!test_and_clear_bit(__FM10K_RESET_DETACHED,
                                        interface->state))
                        return;

                /* Restore the hardware address */
                interface->hw.hw_addr = interface->uc_addr;

                /* PCIe link has been restored, and the device is active
                 * again. Restore everything and reset the device.
                 */
                err = fm10k_handle_reset(interface);
                if (err) {
                        netdev_err(netdev, "Unable to reset device: %d\n", err);
                        interface->hw.hw_addr = NULL;
                        return;
                }

                /* Re-attach the netdev */
                netif_device_attach(netdev);
                netdev_warn(netdev, "PCIe link restored, device now attached\n");
                return;
        }
}

static void fm10k_reset_subtask(struct fm10k_intfc *interface)
{
        int err;

        if (!test_and_clear_bit(FM10K_FLAG_RESET_REQUESTED,
                                interface->flags))
                return;

        /* If another thread has already prepared to reset the device, we
         * should not attempt to handle a reset here, since we'd race with
         * that thread. This may happen if we suspend the device or if the
         * PCIe link is lost. In this case, we'll just ignore the RESET
         * request, as it will (eventually) be taken care of when the thread
         * which actually started the reset is finished.
         */
        if (!fm10k_prepare_for_reset(interface))
                return;

        netdev_err(interface->netdev, "Reset interface\n");

        err = fm10k_handle_reset(interface);
        if (err)
                dev_err(&interface->pdev->dev,
                        "fm10k_handle_reset failed: %d\n", err);
}

/**
 * fm10k_configure_swpri_map - Configure Receive SWPRI to PC mapping
 * @interface: board private structure
 *
 * Configure the SWPRI to PC mapping for the port.
 **/
static void fm10k_configure_swpri_map(struct fm10k_intfc *interface)
{
        struct net_device *netdev = interface->netdev;
        struct fm10k_hw *hw = &interface->hw;
        int i;

        /* clear flag indicating update is needed */
        clear_bit(FM10K_FLAG_SWPRI_CONFIG, interface->flags);

        /* these registers are only available on the PF */
        if (hw->mac.type != fm10k_mac_pf)
                return;

        /* configure SWPRI to PC map */
        for (i = 0; i < FM10K_SWPRI_MAX; i++)
                fm10k_write_reg(hw, FM10K_SWPRI_MAP(i),
                                netdev_get_prio_tc_map(netdev, i));
}

/**
 * fm10k_watchdog_update_host_state - Update the link status based on host.
 * @interface: board private structure
 **/
static void fm10k_watchdog_update_host_state(struct fm10k_intfc *interface)
{
        struct fm10k_hw *hw = &interface->hw;
        s32 err;

        if (test_bit(__FM10K_LINK_DOWN, interface->state)) {
                interface->host_ready = false;
                if (time_is_after_jiffies(interface->link_down_event))
                        return;
                clear_bit(__FM10K_LINK_DOWN, interface->state);
        }

        if (test_bit(FM10K_FLAG_SWPRI_CONFIG, interface->flags)) {
                if (rtnl_trylock()) {
                        fm10k_configure_swpri_map(interface);
                        rtnl_unlock();
                }
        }

        /* lock the mailbox for transmit and receive */
        fm10k_mbx_lock(interface);

        err = hw->mac.ops.get_host_state(hw, &interface->host_ready);
        if (err && time_is_before_jiffies(interface->last_reset))
                set_bit(FM10K_FLAG_RESET_REQUESTED, interface->flags);

        /* free the lock */
        fm10k_mbx_unlock(interface);
}

/**
 * fm10k_mbx_subtask - Process upstream and downstream mailboxes
 * @interface: board private structure
 *
 * This function will process both the upstream and downstream mailboxes.
 **/
static void fm10k_mbx_subtask(struct fm10k_intfc *interface)
{
        /* If we're resetting, bail out */
        if (test_bit(__FM10K_RESETTING, interface->state))
                return;

        /* process upstream mailbox and update device state */
        fm10k_watchdog_update_host_state(interface);

        /* process downstream mailboxes */
        fm10k_iov_mbx(interface);
}

/**
 * fm10k_watchdog_host_is_ready - Update netdev status based on host ready
 * @interface: board private structure
 **/
static void fm10k_watchdog_host_is_ready(struct fm10k_intfc *interface)
{
        struct net_device *netdev = interface->netdev;

        /* only continue if link state is currently down */
        if (netif_carrier_ok(netdev))
                return;

        netif_info(interface, drv, netdev, "NIC Link is up\n");

        netif_carrier_on(netdev);
        netif_tx_wake_all_queues(netdev);
}

/**
 * fm10k_watchdog_host_not_ready - Update netdev status based on host not ready
 * @interface: board private structure
 **/
static void fm10k_watchdog_host_not_ready(struct fm10k_intfc *interface)
{
        struct net_device *netdev = interface->netdev;

        /* only continue if link state is currently up */
        if (!netif_carrier_ok(netdev))
                return;

        netif_info(interface, drv, netdev, "NIC Link is down\n");

        netif_carrier_off(netdev);
        netif_tx_stop_all_queues(netdev);
}

/**
 * fm10k_update_stats - Update the board statistics counters.
 * @interface: board private structure
 **/
void fm10k_update_stats(struct fm10k_intfc *interface)
{
        struct net_device_stats *net_stats = &interface->netdev->stats;
        struct fm10k_hw *hw = &interface->hw;
        u64 hw_csum_tx_good = 0, hw_csum_rx_good = 0, rx_length_errors = 0;
        u64 rx_switch_errors = 0, rx_drops = 0, rx_pp_errors = 0;
        u64 rx_link_errors = 0;
        u64 rx_errors = 0, rx_csum_errors = 0, tx_csum_errors = 0;
        u64 restart_queue = 0, tx_busy = 0, alloc_failed = 0;
        u64 rx_bytes_nic = 0, rx_pkts_nic = 0, rx_drops_nic = 0;
        u64 tx_bytes_nic = 0, tx_pkts_nic = 0;
        u64 bytes, pkts;
        int i;

        /* ensure only one thread updates stats at a time */
        if (test_and_set_bit(__FM10K_UPDATING_STATS, interface->state))
                return;

        /* do not allow stats update via service task for next second */
        interface->next_stats_update = jiffies + HZ;

        /* gather some stats to the interface struct that are per queue */
        for (bytes = 0, pkts = 0, i = 0; i < interface->num_tx_queues; i++) {
                struct fm10k_ring *tx_ring = READ_ONCE(interface->tx_ring[i]);

                if (!tx_ring)
                        continue;

                restart_queue += tx_ring->tx_stats.restart_queue;
                tx_busy += tx_ring->tx_stats.tx_busy;
                tx_csum_errors += tx_ring->tx_stats.csum_err;
                bytes += tx_ring->stats.bytes;
                pkts += tx_ring->stats.packets;
                hw_csum_tx_good += tx_ring->tx_stats.csum_good;
        }

        interface->restart_queue = restart_queue;
        interface->tx_busy = tx_busy;
        net_stats->tx_bytes = bytes;
        net_stats->tx_packets = pkts;
        interface->tx_csum_errors = tx_csum_errors;
        interface->hw_csum_tx_good = hw_csum_tx_good;

        /* gather some stats to the interface struct that are per queue */
        for (bytes = 0, pkts = 0, i = 0; i < interface->num_rx_queues; i++) {
                struct fm10k_ring *rx_ring = READ_ONCE(interface->rx_ring[i]);

                if (!rx_ring)
                        continue;

                bytes += rx_ring->stats.bytes;
                pkts += rx_ring->stats.packets;
                alloc_failed += rx_ring->rx_stats.alloc_failed;
                rx_csum_errors += rx_ring->rx_stats.csum_err;
                rx_errors += rx_ring->rx_stats.errors;
                hw_csum_rx_good += rx_ring->rx_stats.csum_good;
                rx_switch_errors += rx_ring->rx_stats.switch_errors;
                rx_drops += rx_ring->rx_stats.drops;
                rx_pp_errors += rx_ring->rx_stats.pp_errors;
                rx_link_errors += rx_ring->rx_stats.link_errors;
                rx_length_errors += rx_ring->rx_stats.length_errors;
        }

        net_stats->rx_bytes = bytes;
        net_stats->rx_packets = pkts;
        interface->alloc_failed = alloc_failed;
        interface->rx_csum_errors = rx_csum_errors;
        interface->hw_csum_rx_good = hw_csum_rx_good;
        interface->rx_switch_errors = rx_switch_errors;
        interface->rx_drops = rx_drops;
        interface->rx_pp_errors = rx_pp_errors;
        interface->rx_link_errors = rx_link_errors;
        interface->rx_length_errors = rx_length_errors;

        hw->mac.ops.update_hw_stats(hw, &interface->stats);

        for (i = 0; i < hw->mac.max_queues; i++) {
                struct fm10k_hw_stats_q *q = &interface->stats.q[i];

                tx_bytes_nic += q->tx_bytes.count;
                tx_pkts_nic += q->tx_packets.count;
                rx_bytes_nic += q->rx_bytes.count;
                rx_pkts_nic += q->rx_packets.count;
                rx_drops_nic += q->rx_drops.count;
        }

        interface->tx_bytes_nic = tx_bytes_nic;
        interface->tx_packets_nic = tx_pkts_nic;
        interface->rx_bytes_nic = rx_bytes_nic;
        interface->rx_packets_nic = rx_pkts_nic;
        interface->rx_drops_nic = rx_drops_nic;

        /* Fill out the OS statistics structure */
        net_stats->rx_errors = rx_errors;
        net_stats->rx_dropped = interface->stats.nodesc_drop.count;

        /* Update VF statistics */
        fm10k_iov_update_stats(interface);

        clear_bit(__FM10K_UPDATING_STATS, interface->state);
}

/**
 * fm10k_watchdog_flush_tx - flush queues on host not ready
 * @interface: pointer to the device interface structure
 **/
static void fm10k_watchdog_flush_tx(struct fm10k_intfc *interface)
{
        int some_tx_pending = 0;
        int i;

        /* nothing to do if carrier is up */
        if (netif_carrier_ok(interface->netdev))
                return;

        for (i = 0; i < interface->num_tx_queues; i++) {
                struct fm10k_ring *tx_ring = interface->tx_ring[i];

                if (tx_ring->next_to_use != tx_ring->next_to_clean) {
                        some_tx_pending = 1;
                        break;
                }
        }

        /* We've lost link, so the controller stops DMA, but we've got
         * queued Tx work that's never going to get done, so reset
         * controller to flush Tx.
         */
        if (some_tx_pending)
                set_bit(FM10K_FLAG_RESET_REQUESTED, interface->flags);
}

/**
 * fm10k_watchdog_subtask - check and bring link up
 * @interface: pointer to the device interface structure
 **/
static void fm10k_watchdog_subtask(struct fm10k_intfc *interface)
{
        /* if interface is down do nothing */
        if (test_bit(__FM10K_DOWN, interface->state) ||
            test_bit(__FM10K_RESETTING, interface->state))
                return;

        if (interface->host_ready)
                fm10k_watchdog_host_is_ready(interface);
        else
                fm10k_watchdog_host_not_ready(interface);

        /* update stats only once every second */
        if (time_is_before_jiffies(interface->next_stats_update))
                fm10k_update_stats(interface);

        /* flush any uncompleted work */
        fm10k_watchdog_flush_tx(interface);
}

/**
 * fm10k_check_hang_subtask - check for hung queues and dropped interrupts
 * @interface: pointer to the device interface structure
 *
 * This function serves two purposes.  First it strobes the interrupt lines
 * in order to make certain interrupts are occurring.  Secondly it sets the
 * bits needed to check for TX hangs.  As a result we should immediately
 * determine if a hang has occurred.
 */
static void fm10k_check_hang_subtask(struct fm10k_intfc *interface)
{
        /* If we're down or resetting, just bail */
        if (test_bit(__FM10K_DOWN, interface->state) ||
            test_bit(__FM10K_RESETTING, interface->state))
                return;

        /* rate limit tx hang checks to only once every 2 seconds */
        if (time_is_after_eq_jiffies(interface->next_tx_hang_check))
                return;
        interface->next_tx_hang_check = jiffies + (2 * HZ);

        if (netif_carrier_ok(interface->netdev)) {
                int i;

                /* Force detection of hung controller */
                for (i = 0; i < interface->num_tx_queues; i++)
                        set_check_for_tx_hang(interface->tx_ring[i]);

                /* Rearm all in-use q_vectors for immediate firing */
                for (i = 0; i < interface->num_q_vectors; i++) {
                        struct fm10k_q_vector *qv = interface->q_vector[i];

                        if (!qv->tx.count && !qv->rx.count)
                                continue;
                        writel(FM10K_ITR_ENABLE | FM10K_ITR_PENDING2, qv->itr);
                }
        }
}

/**
 * fm10k_service_task - manages and runs subtasks
 * @work: pointer to work_struct containing our data
 **/
static void fm10k_service_task(struct work_struct *work)
{
        struct fm10k_intfc *interface;

        interface = container_of(work, struct fm10k_intfc, service_task);

        /* Check whether we're detached first */
        fm10k_detach_subtask(interface);

        /* tasks run even when interface is down */
        fm10k_mbx_subtask(interface);
        fm10k_reset_subtask(interface);

        /* tasks only run when interface is up */
        fm10k_watchdog_subtask(interface);
        fm10k_check_hang_subtask(interface);

        /* release lock on service events to allow scheduling next event */
        fm10k_service_event_complete(interface);
}

/**
 * fm10k_macvlan_task - send queued MAC/VLAN requests to switch manager
 * @work: pointer to work_struct containing our data
 *
 * This work item handles sending MAC/VLAN updates to the switch manager. When
 * the interface is up, it will attempt to queue mailbox messages to the
 * switch manager requesting updates for MAC/VLAN pairs. If the Tx fifo of the
 * mailbox is full, it will reschedule itself to try again in a short while.
 * This ensures that the driver does not overload the switch mailbox with too
 * many simultaneous requests, causing an unnecessary reset.
 **/
static void fm10k_macvlan_task(struct work_struct *work)
{
        struct fm10k_macvlan_request *item;
        struct fm10k_intfc *interface;
        struct delayed_work *dwork;
        struct list_head *requests;
        struct fm10k_hw *hw;
        unsigned long flags;

        dwork = to_delayed_work(work);
        interface = container_of(dwork, struct fm10k_intfc, macvlan_task);
        hw = &interface->hw;
        requests = &interface->macvlan_requests;

        do {
                /* Pop the first item off the list */
                spin_lock_irqsave(&interface->macvlan_lock, flags);
                item = list_first_entry_or_null(requests,
                                                struct fm10k_macvlan_request,
                                                list);
                if (item)
                        list_del_init(&item->list);

                spin_unlock_irqrestore(&interface->macvlan_lock, flags);

                /* We have no more items to process */
                if (!item)
                        goto done;

                fm10k_mbx_lock(interface);

                /* Check that we have plenty of space to send the message. We
                 * want to ensure that the mailbox stays low enough to avoid a
                 * change in the host state, otherwise we may see spurious
                 * link up / link down notifications.
                 */
                if (!hw->mbx.ops.tx_ready(&hw->mbx, FM10K_VFMBX_MSG_MTU + 5)) {
                        hw->mbx.ops.process(hw, &hw->mbx);
                        set_bit(__FM10K_MACVLAN_REQUEST, interface->state);
                        fm10k_mbx_unlock(interface);

                        /* Put the request back on the list */
                        spin_lock_irqsave(&interface->macvlan_lock, flags);
                        list_add(&item->list, requests);
                        spin_unlock_irqrestore(&interface->macvlan_lock, flags);
                        break;
                }

                switch (item->type) {
                case FM10K_MC_MAC_REQUEST:
                        hw->mac.ops.update_mc_addr(hw,
                                                   item->mac.glort,
                                                   item->mac.addr,
                                                   item->mac.vid,
                                                   item->set);
                        break;
                case FM10K_UC_MAC_REQUEST:
                        hw->mac.ops.update_uc_addr(hw,
                                                   item->mac.glort,
                                                   item->mac.addr,
                                                   item->mac.vid,
                                                   item->set,
                                                   0);
                        break;
                case FM10K_VLAN_REQUEST:
                        hw->mac.ops.update_vlan(hw,
                                                item->vlan.vid,
                                                item->vlan.vsi,
                                                item->set);
                        break;
                default:
                        break;
                }

                fm10k_mbx_unlock(interface);

                /* Free the item now that we've sent the update */
                kfree(item);
        } while (true);

done:
        WARN_ON(!test_bit(__FM10K_MACVLAN_SCHED, interface->state));

        /* flush memory to make sure state is correct */
        smp_mb__before_atomic();
        clear_bit(__FM10K_MACVLAN_SCHED, interface->state);

        /* If a MAC/VLAN request was scheduled since we started, we should
         * re-schedule. However, there is no reason to re-schedule if there is
         * no work to do.
         */
        if (test_bit(__FM10K_MACVLAN_REQUEST, interface->state))
                fm10k_macvlan_schedule(interface);
}

/**
 * fm10k_configure_tx_ring - Configure Tx ring after Reset
 * @interface: board private structure
 * @ring: structure containing ring specific data
 *
 * Configure the Tx descriptor ring after a reset.
 **/
static void fm10k_configure_tx_ring(struct fm10k_intfc *interface,
                                    struct fm10k_ring *ring)
{
        struct fm10k_hw *hw = &interface->hw;
        u64 tdba = ring->dma;
        u32 size = ring->count * sizeof(struct fm10k_tx_desc);
        u32 txint = FM10K_INT_MAP_DISABLE;
        u32 txdctl = BIT(FM10K_TXDCTL_MAX_TIME_SHIFT) | FM10K_TXDCTL_ENABLE;
        u8 reg_idx = ring->reg_idx;

        /* disable queue to avoid issues while updating state */
        fm10k_write_reg(hw, FM10K_TXDCTL(reg_idx), 0);
        fm10k_write_flush(hw);

        /* possible poll here to verify ring resources have been cleaned */

        /* set location and size for descriptor ring */
        fm10k_write_reg(hw, FM10K_TDBAL(reg_idx), tdba & DMA_BIT_MASK(32));
        fm10k_write_reg(hw, FM10K_TDBAH(reg_idx), tdba >> 32);
        fm10k_write_reg(hw, FM10K_TDLEN(reg_idx), size);

        /* reset head and tail pointers */
        fm10k_write_reg(hw, FM10K_TDH(reg_idx), 0);
        fm10k_write_reg(hw, FM10K_TDT(reg_idx), 0);

        /* store tail pointer */
        ring->tail = &interface->uc_addr[FM10K_TDT(reg_idx)];

        /* reset ntu and ntc to place SW in sync with hardware */
        ring->next_to_clean = 0;
        ring->next_to_use = 0;

        /* Map interrupt */
        if (ring->q_vector) {
                txint = ring->q_vector->v_idx + NON_Q_VECTORS;
                txint |= FM10K_INT_MAP_TIMER0;
        }

        fm10k_write_reg(hw, FM10K_TXINT(reg_idx), txint);

        /* enable use of FTAG bit in Tx descriptor, register is RO for VF */
        fm10k_write_reg(hw, FM10K_PFVTCTL(reg_idx),
                        FM10K_PFVTCTL_FTAG_DESC_ENABLE);

        /* Initialize XPS */
        if (!test_and_set_bit(__FM10K_TX_XPS_INIT_DONE, ring->state) &&
            ring->q_vector)
                netif_set_xps_queue(ring->netdev,
                                    &ring->q_vector->affinity_mask,
                                    ring->queue_index);

        /* enable queue */
        fm10k_write_reg(hw, FM10K_TXDCTL(reg_idx), txdctl);
}

/**
 * fm10k_enable_tx_ring - Verify Tx ring is enabled after configuration
 * @interface: board private structure
 * @ring: structure containing ring specific data
 *
 * Verify the Tx descriptor ring is ready for transmit.
 **/
static void fm10k_enable_tx_ring(struct fm10k_intfc *interface,
                                 struct fm10k_ring *ring)
{
        struct fm10k_hw *hw = &interface->hw;
        int wait_loop = 10;
        u32 txdctl;
        u8 reg_idx = ring->reg_idx;

        /* if we are already enabled just exit */
        if (fm10k_read_reg(hw, FM10K_TXDCTL(reg_idx)) & FM10K_TXDCTL_ENABLE)
                return;

        /* poll to verify queue is enabled */
        do {
                usleep_range(1000, 2000);
                txdctl = fm10k_read_reg(hw, FM10K_TXDCTL(reg_idx));
        } while (!(txdctl & FM10K_TXDCTL_ENABLE) && --wait_loop);
        if (!wait_loop)
                netif_err(interface, drv, interface->netdev,
                          "Could not enable Tx Queue %d\n", reg_idx);
}

/**
 * fm10k_configure_tx - Configure Transmit Unit after Reset
 * @interface: board private structure
 *
 * Configure the Tx unit of the MAC after a reset.
 **/
static void fm10k_configure_tx(struct fm10k_intfc *interface)
{
        int i;

        /* Setup the HW Tx Head and Tail descriptor pointers */
        for (i = 0; i < interface->num_tx_queues; i++)
                fm10k_configure_tx_ring(interface, interface->tx_ring[i]);

        /* poll here to verify that Tx rings are now enabled */
        for (i = 0; i < interface->num_tx_queues; i++)
                fm10k_enable_tx_ring(interface, interface->tx_ring[i]);
}

/**
 * fm10k_configure_rx_ring - Configure Rx ring after Reset
 * @interface: board private structure
 * @ring: structure containing ring specific data
 *
 * Configure the Rx descriptor ring after a reset.
 **/
static void fm10k_configure_rx_ring(struct fm10k_intfc *interface,
                                    struct fm10k_ring *ring)
{
        u64 rdba = ring->dma;
        struct fm10k_hw *hw = &interface->hw;
        u32 size = ring->count * sizeof(union fm10k_rx_desc);
        u32 rxqctl, rxdctl = FM10K_RXDCTL_WRITE_BACK_MIN_DELAY;
        u32 srrctl = FM10K_SRRCTL_BUFFER_CHAINING_EN;
        u32 rxint = FM10K_INT_MAP_DISABLE;
        u8 rx_pause = interface->rx_pause;
        u8 reg_idx = ring->reg_idx;

        /* disable queue to avoid issues while updating state */
        rxqctl = fm10k_read_reg(hw, FM10K_RXQCTL(reg_idx));
        rxqctl &= ~FM10K_RXQCTL_ENABLE;
        fm10k_write_reg(hw, FM10K_RXQCTL(reg_idx), rxqctl);
        fm10k_write_flush(hw);

        /* possible poll here to verify ring resources have been cleaned */

        /* set location and size for descriptor ring */

        fm10k_write_reg(hw, FM10K_RDBAL(reg_idx), rdba & DMA_BIT_MASK(32));
        fm10k_write_reg(hw, FM10K_RDBAH(reg_idx), rdba >> 32);
        fm10k_write_reg(hw, FM10K_RDLEN(reg_idx), size);

        /* reset head and tail pointers */
        fm10k_write_reg(hw, FM10K_RDH(reg_idx), 0);
        fm10k_write_reg(hw, FM10K_RDT(reg_idx), 0);

        /* store tail pointer */
        ring->tail = &interface->uc_addr[FM10K_RDT(reg_idx)];

        /* reset ntu and ntc to place SW in sync with hardware */
        ring->next_to_clean = 0;
        ring->next_to_use = 0;
        ring->next_to_alloc = 0;

        /* Configure the Rx buffer size for one buff without split */
        srrctl |= FM10K_RX_BUFSZ >> FM10K_SRRCTL_BSIZEPKT_SHIFT;

        /* Configure the Rx ring to suppress loopback packets */
        srrctl |= FM10K_SRRCTL_LOOPBACK_SUPPRESS;
        fm10k_write_reg(hw, FM10K_SRRCTL(reg_idx), srrctl);

        /* Enable drop on empty */
#ifdef CONFIG_DCB
        if (interface->pfc_en)
                rx_pause = interface->pfc_en;
#endif
        if (!(rx_pause & BIT(ring->qos_pc)))
                rxdctl |= FM10K_RXDCTL_DROP_ON_EMPTY;

        fm10k_write_reg(hw, FM10K_RXDCTL(reg_idx), rxdctl);

        /* assign default VLAN to queue */
        ring->vid = hw->mac.default_vid;

        /* if we have an active VLAN, disable default VLAN ID */
        if (test_bit(hw->mac.default_vid, interface->active_vlans))
                ring->vid |= FM10K_VLAN_CLEAR;

        /* Map interrupt */
        if (ring->q_vector) {
                rxint = ring->q_vector->v_idx + NON_Q_VECTORS;
                rxint |= FM10K_INT_MAP_TIMER1;
        }

        fm10k_write_reg(hw, FM10K_RXINT(reg_idx), rxint);

        /* enable queue */
        rxqctl = fm10k_read_reg(hw, FM10K_RXQCTL(reg_idx));
        rxqctl |= FM10K_RXQCTL_ENABLE;
        fm10k_write_reg(hw, FM10K_RXQCTL(reg_idx), rxqctl);

        /* place buffers on ring for receive data */
        fm10k_alloc_rx_buffers(ring, fm10k_desc_unused(ring));
}

/**
 * fm10k_update_rx_drop_en - Configures the drop enable bits for Rx rings
 * @interface: board private structure
 *
 * Configure the drop enable bits for the Rx rings.
 **/
void fm10k_update_rx_drop_en(struct fm10k_intfc *interface)
{
        struct fm10k_hw *hw = &interface->hw;
        u8 rx_pause = interface->rx_pause;
        int i;

#ifdef CONFIG_DCB
        if (interface->pfc_en)
                rx_pause = interface->pfc_en;

#endif
        for (i = 0; i < interface->num_rx_queues; i++) {
                struct fm10k_ring *ring = interface->rx_ring[i];
                u32 rxdctl = FM10K_RXDCTL_WRITE_BACK_MIN_DELAY;
                u8 reg_idx = ring->reg_idx;

                if (!(rx_pause & BIT(ring->qos_pc)))
                        rxdctl |= FM10K_RXDCTL_DROP_ON_EMPTY;

                fm10k_write_reg(hw, FM10K_RXDCTL(reg_idx), rxdctl);
        }
}

/**
 * fm10k_configure_dglort - Configure Receive DGLORT after reset
 * @interface: board private structure
 *
 * Configure the DGLORT description and RSS tables.
 **/
static void fm10k_configure_dglort(struct fm10k_intfc *interface)
{
        struct fm10k_dglort_cfg dglort = { 0 };
        struct fm10k_hw *hw = &interface->hw;
        int i;
        u32 mrqc;

        /* Fill out hash function seeds */
        for (i = 0; i < FM10K_RSSRK_SIZE; i++)
                fm10k_write_reg(hw, FM10K_RSSRK(0, i), interface->rssrk[i]);

        /* Write RETA table to hardware */
        for (i = 0; i < FM10K_RETA_SIZE; i++)
                fm10k_write_reg(hw, FM10K_RETA(0, i), interface->reta[i]);

        /* Generate RSS hash based on packet types, TCP/UDP
         * port numbers and/or IPv4/v6 src and dst addresses
         */
        mrqc = FM10K_MRQC_IPV4 |
               FM10K_MRQC_TCP_IPV4 |
               FM10K_MRQC_IPV6 |
               FM10K_MRQC_TCP_IPV6;

        if (test_bit(FM10K_FLAG_RSS_FIELD_IPV4_UDP, interface->flags))
                mrqc |= FM10K_MRQC_UDP_IPV4;
        if (test_bit(FM10K_FLAG_RSS_FIELD_IPV6_UDP, interface->flags))
                mrqc |= FM10K_MRQC_UDP_IPV6;

        fm10k_write_reg(hw, FM10K_MRQC(0), mrqc);

        /* configure default DGLORT mapping for RSS/DCB */
        dglort.inner_rss = 1;
        dglort.rss_l = fls(interface->ring_feature[RING_F_RSS].mask);
        dglort.pc_l = fls(interface->ring_feature[RING_F_QOS].mask);
        hw->mac.ops.configure_dglort_map(hw, &dglort);

        /* assign GLORT per queue for queue mapped testing */
        if (interface->glort_count > 64) {
                memset(&dglort, 0, sizeof(dglort));
                dglort.inner_rss = 1;
                dglort.glort = interface->glort + 64;
                dglort.idx = fm10k_dglort_pf_queue;
                dglort.queue_l = fls(interface->num_rx_queues - 1);
                hw->mac.ops.configure_dglort_map(hw, &dglort);
        }

        /* assign glort value for RSS/DCB specific to this interface */
        memset(&dglort, 0, sizeof(dglort));
        dglort.inner_rss = 1;
        dglort.glort = interface->glort;
        dglort.rss_l = fls(interface->ring_feature[RING_F_RSS].mask);
        dglort.pc_l = fls(interface->ring_feature[RING_F_QOS].mask);
        /* configure DGLORT mapping for RSS/DCB */
        dglort.idx = fm10k_dglort_pf_rss;
        if (interface->l2_accel)
                dglort.shared_l = fls(interface->l2_accel->size);
        hw->mac.ops.configure_dglort_map(hw, &dglort);
}

/**
 * fm10k_configure_rx - Configure Receive Unit after Reset
 * @interface: board private structure
 *
 * Configure the Rx unit of the MAC after a reset.
 **/
static void fm10k_configure_rx(struct fm10k_intfc *interface)
{
        int i;

        /* Configure SWPRI to PC map */
        fm10k_configure_swpri_map(interface);

        /* Configure RSS and DGLORT map */
        fm10k_configure_dglort(interface);

        /* Setup the HW Rx Head and Tail descriptor pointers */
        for (i = 0; i < interface->num_rx_queues; i++)
                fm10k_configure_rx_ring(interface, interface->rx_ring[i]);

        /* possible poll here to verify that Rx rings are now enabled */
}

static void fm10k_napi_enable_all(struct fm10k_intfc *interface)
{
        struct fm10k_q_vector *q_vector;
        int q_idx;

        for (q_idx = 0; q_idx < interface->num_q_vectors; q_idx++) {
                q_vector = interface->q_vector[q_idx];
                napi_enable(&q_vector->napi);
        }
}

static irqreturn_t fm10k_msix_clean_rings(int __always_unused irq, void *data)
{
        struct fm10k_q_vector *q_vector = data;

        if (q_vector->rx.count || q_vector->tx.count)
                napi_schedule_irqoff(&q_vector->napi);

        return IRQ_HANDLED;
}

static irqreturn_t fm10k_msix_mbx_vf(int __always_unused irq, void *data)
{
        struct fm10k_intfc *interface = data;
        struct fm10k_hw *hw = &interface->hw;
        struct fm10k_mbx_info *mbx = &hw->mbx;

        /* re-enable mailbox interrupt and indicate 20us delay */
        fm10k_write_reg(hw, FM10K_VFITR(FM10K_MBX_VECTOR),
                        (FM10K_MBX_INT_DELAY >> hw->mac.itr_scale) |
                        FM10K_ITR_ENABLE);

        /* service upstream mailbox */
        if (fm10k_mbx_trylock(interface)) {
                mbx->ops.process(hw, mbx);
                fm10k_mbx_unlock(interface);
        }

        hw->mac.get_host_state = true;
        fm10k_service_event_schedule(interface);

        return IRQ_HANDLED;
}

#define FM10K_ERR_MSG(type) case (type): error = #type; break
static void fm10k_handle_fault(struct fm10k_intfc *interface, int type,
                               struct fm10k_fault *fault)
{
        struct pci_dev *pdev = interface->pdev;
        struct fm10k_hw *hw = &interface->hw;
        struct fm10k_iov_data *iov_data = interface->iov_data;
        char *error;

        switch (type) {
        case FM10K_PCA_FAULT:
                switch (fault->type) {
                default:
                        error = "Unknown PCA error";
                        break;
                FM10K_ERR_MSG(PCA_NO_FAULT);
                FM10K_ERR_MSG(PCA_UNMAPPED_ADDR);
                FM10K_ERR_MSG(PCA_BAD_QACCESS_PF);
                FM10K_ERR_MSG(PCA_BAD_QACCESS_VF);
                FM10K_ERR_MSG(PCA_MALICIOUS_REQ);
                FM10K_ERR_MSG(PCA_POISONED_TLP);
                FM10K_ERR_MSG(PCA_TLP_ABORT);
                }
                break;
        case FM10K_THI_FAULT:
                switch (fault->type) {
                default:
                        error = "Unknown THI error";
                        break;
                FM10K_ERR_MSG(THI_NO_FAULT);
                FM10K_ERR_MSG(THI_MAL_DIS_Q_FAULT);
                }
                break;
        case FM10K_FUM_FAULT:
                switch (fault->type) {
                default:
                        error = "Unknown FUM error";
                        break;
                FM10K_ERR_MSG(FUM_NO_FAULT);
                FM10K_ERR_MSG(FUM_UNMAPPED_ADDR);
                FM10K_ERR_MSG(FUM_BAD_VF_QACCESS);
                FM10K_ERR_MSG(FUM_ADD_DECODE_ERR);
                FM10K_ERR_MSG(FUM_RO_ERROR);
                FM10K_ERR_MSG(FUM_QPRC_CRC_ERROR);
                FM10K_ERR_MSG(FUM_CSR_TIMEOUT);
                FM10K_ERR_MSG(FUM_INVALID_TYPE);
                FM10K_ERR_MSG(FUM_INVALID_LENGTH);
                FM10K_ERR_MSG(FUM_INVALID_BE);
                FM10K_ERR_MSG(FUM_INVALID_ALIGN);
                }
                break;
        default:
                error = "Undocumented fault";
                break;
        }

        dev_warn(&pdev->dev,
                 "%s Address: 0x%llx SpecInfo: 0x%x Func: %02x.%0x\n",
                 error, fault->address, fault->specinfo,
                 PCI_SLOT(fault->func), PCI_FUNC(fault->func));

        /* For VF faults, clear out the respective LPORT, reset the queue
         * resources, and then reconnect to the mailbox. This allows the
         * VF in question to resume behavior. For transient faults that are
         * the result of non-malicious behavior this will log the fault and
         * allow the VF to resume functionality. Obviously for malicious VFs
         * they will be able to attempt malicious behavior again. In this
         * case, the system administrator will need to step in and manually
         * remove or disable the VF in question.
         */
        if (fault->func && iov_data) {
                int vf = fault->func - 1;
                struct fm10k_vf_info *vf_info = &iov_data->vf_info[vf];

                hw->iov.ops.reset_lport(hw, vf_info);
                hw->iov.ops.reset_resources(hw, vf_info);

                /* reset_lport disables the VF, so re-enable it */
                hw->iov.ops.set_lport(hw, vf_info, vf,
                                      FM10K_VF_FLAG_MULTI_CAPABLE);

                /* reset_resources will disconnect from the mbx  */
                vf_info->mbx.ops.connect(hw, &vf_info->mbx);
        }
}

static void fm10k_report_fault(struct fm10k_intfc *interface, u32 eicr)
{
        struct fm10k_hw *hw = &interface->hw;
        struct fm10k_fault fault = { 0 };
        int type, err;

        for (eicr &= FM10K_EICR_FAULT_MASK, type = FM10K_PCA_FAULT;
             eicr;
             eicr >>= 1, type += FM10K_FAULT_SIZE) {
                /* only check if there is an error reported */
                if (!(eicr & 0x1))
                        continue;

                /* retrieve fault info */
                err = hw->mac.ops.get_fault(hw, type, &fault);
                if (err) {
                        dev_err(&interface->pdev->dev,
                                "error reading fault\n");
                        continue;
                }

                fm10k_handle_fault(interface, type, &fault);
        }
}

static void fm10k_reset_drop_on_empty(struct fm10k_intfc *interface, u32 eicr)
{
        struct fm10k_hw *hw = &interface->hw;
        const u32 rxdctl = FM10K_RXDCTL_WRITE_BACK_MIN_DELAY;
        u32 maxholdq;
        int q;

        if (!(eicr & FM10K_EICR_MAXHOLDTIME))
                return;

        maxholdq = fm10k_read_reg(hw, FM10K_MAXHOLDQ(7));
        if (maxholdq)
                fm10k_write_reg(hw, FM10K_MAXHOLDQ(7), maxholdq);
        for (q = 255;;) {
                if (maxholdq & BIT(31)) {
                        if (q < FM10K_MAX_QUEUES_PF) {
                                interface->rx_overrun_pf++;
                                fm10k_write_reg(hw, FM10K_RXDCTL(q), rxdctl);
                        } else {
                                interface->rx_overrun_vf++;
                        }
                }

                maxholdq *= 2;
                if (!maxholdq)
                        q &= ~(32 - 1);

                if (!q)
                        break;

                if (q-- % 32)
                        continue;

                maxholdq = fm10k_read_reg(hw, FM10K_MAXHOLDQ(q / 32));
                if (maxholdq)
                        fm10k_write_reg(hw, FM10K_MAXHOLDQ(q / 32), maxholdq);
        }
}

static irqreturn_t fm10k_msix_mbx_pf(int __always_unused irq, void *data)
{
        struct fm10k_intfc *interface = data;
        struct fm10k_hw *hw = &interface->hw;
        struct fm10k_mbx_info *mbx = &hw->mbx;
        u32 eicr;
        s32 err = 0;

        /* unmask any set bits related to this interrupt */
        eicr = fm10k_read_reg(hw, FM10K_EICR);
        fm10k_write_reg(hw, FM10K_EICR, eicr & (FM10K_EICR_MAILBOX |
                                                FM10K_EICR_SWITCHREADY |
                                                FM10K_EICR_SWITCHNOTREADY));

        /* report any faults found to the message log */
        fm10k_report_fault(interface, eicr);

        /* reset any queues disabled due to receiver overrun */
        fm10k_reset_drop_on_empty(interface, eicr);

        /* service mailboxes */
        if (fm10k_mbx_trylock(interface)) {
                err = mbx->ops.process(hw, mbx);
                /* handle VFLRE events */
                fm10k_iov_event(interface);
                fm10k_mbx_unlock(interface);
        }

        if (err == FM10K_ERR_RESET_REQUESTED)
                set_bit(FM10K_FLAG_RESET_REQUESTED, interface->flags);

        /* if switch toggled state we should reset GLORTs */
        if (eicr & FM10K_EICR_SWITCHNOTREADY) {
                /* force link down for at least 4 seconds */
                interface->link_down_event = jiffies + (4 * HZ);
                set_bit(__FM10K_LINK_DOWN, interface->state);

                /* reset dglort_map back to no config */
                hw->mac.dglort_map = FM10K_DGLORTMAP_NONE;
        }

        /* we should validate host state after interrupt event */
        hw->mac.get_host_state = true;

        /* validate host state, and handle VF mailboxes in the service task */
        fm10k_service_event_schedule(interface);

        /* re-enable mailbox interrupt and indicate 20us delay */
        fm10k_write_reg(hw, FM10K_ITR(FM10K_MBX_VECTOR),
                        (FM10K_MBX_INT_DELAY >> hw->mac.itr_scale) |
                        FM10K_ITR_ENABLE);

        return IRQ_HANDLED;
}

void fm10k_mbx_free_irq(struct fm10k_intfc *interface)
{
        struct fm10k_hw *hw = &interface->hw;
        struct msix_entry *entry;
        int itr_reg;

        /* no mailbox IRQ to free if MSI-X is not enabled */
        if (!interface->msix_entries)
                return;

        entry = &interface->msix_entries[FM10K_MBX_VECTOR];

        /* disconnect the mailbox */
        hw->mbx.ops.disconnect(hw, &hw->mbx);

        /* disable Mailbox cause */
        if (hw->mac.type == fm10k_mac_pf) {
                fm10k_write_reg(hw, FM10K_EIMR,
                                FM10K_EIMR_DISABLE(PCA_FAULT) |
                                FM10K_EIMR_DISABLE(FUM_FAULT) |
                                FM10K_EIMR_DISABLE(MAILBOX) |
                                FM10K_EIMR_DISABLE(SWITCHREADY) |
                                FM10K_EIMR_DISABLE(SWITCHNOTREADY) |
                                FM10K_EIMR_DISABLE(SRAMERROR) |
                                FM10K_EIMR_DISABLE(VFLR) |
                                FM10K_EIMR_DISABLE(MAXHOLDTIME));
                itr_reg = FM10K_ITR(FM10K_MBX_VECTOR);
        } else {
                itr_reg = FM10K_VFITR(FM10K_MBX_VECTOR);
        }

        fm10k_write_reg(hw, itr_reg, FM10K_ITR_MASK_SET);

        free_irq(entry->vector, interface);
}

static s32 fm10k_mbx_mac_addr(struct fm10k_hw *hw, u32 **results,
                              struct fm10k_mbx_info *mbx)
{
        bool vlan_override = hw->mac.vlan_override;
        u16 default_vid = hw->mac.default_vid;
        struct fm10k_intfc *interface;
        s32 err;

        err = fm10k_msg_mac_vlan_vf(hw, results, mbx);
        if (err)
                return err;

        interface = container_of(hw, struct fm10k_intfc, hw);

        /* MAC was changed so we need reset */
        if (is_valid_ether_addr(hw->mac.perm_addr) &&
            !ether_addr_equal(hw->mac.perm_addr, hw->mac.addr))
                set_bit(FM10K_FLAG_RESET_REQUESTED, interface->flags);

        /* VLAN override was changed, or default VLAN changed */
        if ((vlan_override != hw->mac.vlan_override) ||
            (default_vid != hw->mac.default_vid))
                set_bit(FM10K_FLAG_RESET_REQUESTED, interface->flags);

        return 0;
}

/* generic error handler for mailbox issues */
static s32 fm10k_mbx_error(struct fm10k_hw *hw, u32 **results,
                           struct fm10k_mbx_info __always_unused *mbx)
{
        struct fm10k_intfc *interface;
        struct pci_dev *pdev;

        interface = container_of(hw, struct fm10k_intfc, hw);
        pdev = interface->pdev;

        dev_err(&pdev->dev, "Unknown message ID %u\n",
                **results & FM10K_TLV_ID_MASK);

        return 0;
}

static const struct fm10k_msg_data vf_mbx_data[] = {
        FM10K_TLV_MSG_TEST_HANDLER(fm10k_tlv_msg_test),
        FM10K_VF_MSG_MAC_VLAN_HANDLER(fm10k_mbx_mac_addr),
        FM10K_VF_MSG_LPORT_STATE_HANDLER(fm10k_msg_lport_state_vf),
        FM10K_TLV_MSG_ERROR_HANDLER(fm10k_mbx_error),
};

static int fm10k_mbx_request_irq_vf(struct fm10k_intfc *interface)
{
        struct msix_entry *entry = &interface->msix_entries[FM10K_MBX_VECTOR];
        struct net_device *dev = interface->netdev;
        struct fm10k_hw *hw = &interface->hw;
        int err;

        /* Use timer0 for interrupt moderation on the mailbox */
        u32 itr = entry->entry | FM10K_INT_MAP_TIMER0;

        /* register mailbox handlers */
        err = hw->mbx.ops.register_handlers(&hw->mbx, vf_mbx_data);
        if (err)
                return err;

        /* request the IRQ */
        err = request_irq(entry->vector, fm10k_msix_mbx_vf, 0,
                          dev->name, interface);
        if (err) {
                netif_err(interface, probe, dev,
                          "request_irq for msix_mbx failed: %d\n", err);
                return err;
        }

        /* map all of the interrupt sources */
        fm10k_write_reg(hw, FM10K_VFINT_MAP, itr);

        /* enable interrupt */
        fm10k_write_reg(hw, FM10K_VFITR(entry->entry), FM10K_ITR_ENABLE);

        return 0;
}

static s32 fm10k_lport_map(struct fm10k_hw *hw, u32 **results,
                           struct fm10k_mbx_info *mbx)
{
        struct fm10k_intfc *interface;
        u32 dglort_map = hw->mac.dglort_map;
        s32 err;

        interface = container_of(hw, struct fm10k_intfc, hw);

        err = fm10k_msg_err_pf(hw, results, mbx);
        if (!err && hw->swapi.status) {
                /* force link down for a reasonable delay */
                interface->link_down_event = jiffies + (2 * HZ);
                set_bit(__FM10K_LINK_DOWN, interface->state);

                /* reset dglort_map back to no config */
                hw->mac.dglort_map = FM10K_DGLORTMAP_NONE;

                fm10k_service_event_schedule(interface);

                /* prevent overloading kernel message buffer */
                if (interface->lport_map_failed)
                        return 0;

                interface->lport_map_failed = true;

                if (hw->swapi.status == FM10K_MSG_ERR_PEP_NOT_SCHEDULED)
                        dev_warn(&interface->pdev->dev,
                                 "cannot obtain link because the host interface is configured for a PCIe host interface bandwidth of zero\n");
                dev_warn(&interface->pdev->dev,
                         "request logical port map failed: %d\n",
                         hw->swapi.status);

                return 0;
        }

        err = fm10k_msg_lport_map_pf(hw, results, mbx);
        if (err)
                return err;

        interface->lport_map_failed = false;

        /* we need to reset if port count was just updated */
        if (dglort_map != hw->mac.dglort_map)
                set_bit(FM10K_FLAG_RESET_REQUESTED, interface->flags);

        return 0;
}

static s32 fm10k_update_pvid(struct fm10k_hw *hw, u32 **results,
                             struct fm10k_mbx_info __always_unused *mbx)
{
        struct fm10k_intfc *interface;
        u16 glort, pvid;
        u32 pvid_update;
        s32 err;

        err = fm10k_tlv_attr_get_u32(results[FM10K_PF_ATTR_ID_UPDATE_PVID],
                                     &pvid_update);
        if (err)
                return err;

        /* extract values from the pvid update */
        glort = FM10K_MSG_HDR_FIELD_GET(pvid_update, UPDATE_PVID_GLORT);
        pvid = FM10K_MSG_HDR_FIELD_GET(pvid_update, UPDATE_PVID_PVID);

        /* if glort is not valid return error */
        if (!fm10k_glort_valid_pf(hw, glort))
                return FM10K_ERR_PARAM;

        /* verify VLAN ID is valid */
        if (pvid >= FM10K_VLAN_TABLE_VID_MAX)
                return FM10K_ERR_PARAM;

        interface = container_of(hw, struct fm10k_intfc, hw);

        /* check to see if this belongs to one of the VFs */
        err = fm10k_iov_update_pvid(interface, glort, pvid);
        if (!err)
                return 0;

        /* we need to reset if default VLAN was just updated */
        if (pvid != hw->mac.default_vid)
                set_bit(FM10K_FLAG_RESET_REQUESTED, interface->flags);

        hw->mac.default_vid = pvid;

        return 0;
}

static const struct fm10k_msg_data pf_mbx_data[] = {
        FM10K_PF_MSG_ERR_HANDLER(XCAST_MODES, fm10k_msg_err_pf),
        FM10K_PF_MSG_ERR_HANDLER(UPDATE_MAC_FWD_RULE, fm10k_msg_err_pf),
        FM10K_PF_MSG_LPORT_MAP_HANDLER(fm10k_lport_map),
        FM10K_PF_MSG_ERR_HANDLER(LPORT_CREATE, fm10k_msg_err_pf),
        FM10K_PF_MSG_ERR_HANDLER(LPORT_DELETE, fm10k_msg_err_pf),
        FM10K_PF_MSG_UPDATE_PVID_HANDLER(fm10k_update_pvid),
        FM10K_TLV_MSG_ERROR_HANDLER(fm10k_mbx_error),
};

static int fm10k_mbx_request_irq_pf(struct fm10k_intfc *interface)
{
        struct msix_entry *entry = &interface->msix_entries[FM10K_MBX_VECTOR];
        struct net_device *dev = interface->netdev;
        struct fm10k_hw *hw = &interface->hw;
        int err;

        /* Use timer0 for interrupt moderation on the mailbox */
        u32 mbx_itr = entry->entry | FM10K_INT_MAP_TIMER0;
        u32 other_itr = entry->entry | FM10K_INT_MAP_IMMEDIATE;

        /* register mailbox handlers */
        err = hw->mbx.ops.register_handlers(&hw->mbx, pf_mbx_data);
        if (err)
                return err;

        /* request the IRQ */
        err = request_irq(entry->vector, fm10k_msix_mbx_pf, 0,
                          dev->name, interface);
        if (err) {
                netif_err(interface, probe, dev,
                          "request_irq for msix_mbx failed: %d\n", err);
                return err;
        }

        /* Enable interrupts w/ no moderation for "other" interrupts */
        fm10k_write_reg(hw, FM10K_INT_MAP(fm10k_int_pcie_fault), other_itr);
        fm10k_write_reg(hw, FM10K_INT_MAP(fm10k_int_switch_up_down), other_itr);
        fm10k_write_reg(hw, FM10K_INT_MAP(fm10k_int_sram), other_itr);
        fm10k_write_reg(hw, FM10K_INT_MAP(fm10k_int_max_hold_time), other_itr);
        fm10k_write_reg(hw, FM10K_INT_MAP(fm10k_int_vflr), other_itr);

        /* Enable interrupts w/ moderation for mailbox */
        fm10k_write_reg(hw, FM10K_INT_MAP(fm10k_int_mailbox), mbx_itr);

        /* Enable individual interrupt causes */
        fm10k_write_reg(hw, FM10K_EIMR, FM10K_EIMR_ENABLE(PCA_FAULT) |
                                        FM10K_EIMR_ENABLE(FUM_FAULT) |
                                        FM10K_EIMR_ENABLE(MAILBOX) |
                                        FM10K_EIMR_ENABLE(SWITCHREADY) |
                                        FM10K_EIMR_ENABLE(SWITCHNOTREADY) |
                                        FM10K_EIMR_ENABLE(SRAMERROR) |
                                        FM10K_EIMR_ENABLE(VFLR) |
                                        FM10K_EIMR_ENABLE(MAXHOLDTIME));

        /* enable interrupt */
        fm10k_write_reg(hw, FM10K_ITR(entry->entry), FM10K_ITR_ENABLE);

        return 0;
}

int fm10k_mbx_request_irq(struct fm10k_intfc *interface)
{
        struct fm10k_hw *hw = &interface->hw;
        int err;

        /* enable Mailbox cause */
        if (hw->mac.type == fm10k_mac_pf)
                err = fm10k_mbx_request_irq_pf(interface);
        else
                err = fm10k_mbx_request_irq_vf(interface);
        if (err)
                return err;

        /* connect mailbox */
        err = hw->mbx.ops.connect(hw, &hw->mbx);

        /* if the mailbox failed to connect, then free IRQ */
        if (err)
                fm10k_mbx_free_irq(interface);

        return err;
}

/**
 * fm10k_qv_free_irq - release interrupts associated with queue vectors
 * @interface: board private structure
 *
 * Release all interrupts associated with this interface
 **/
void fm10k_qv_free_irq(struct fm10k_intfc *interface)
{
        int vector = interface->num_q_vectors;
        struct msix_entry *entry;

        entry = &interface->msix_entries[NON_Q_VECTORS + vector];

        while (vector) {
                struct fm10k_q_vector *q_vector;

                vector--;
                entry--;
                q_vector = interface->q_vector[vector];

                if (!q_vector->tx.count && !q_vector->rx.count)
                        continue;

                /* clear the affinity_mask in the IRQ descriptor */
                irq_set_affinity_hint(entry->vector, NULL);

                /* disable interrupts */
                writel(FM10K_ITR_MASK_SET, q_vector->itr);

                free_irq(entry->vector, q_vector);
        }
}

/**
 * fm10k_qv_request_irq - initialize interrupts for queue vectors
 * @interface: board private structure
 *
 * Attempts to configure interrupts using the best available
 * capabilities of the hardware and kernel.
 **/
int fm10k_qv_request_irq(struct fm10k_intfc *interface)
{
        struct net_device *dev = interface->netdev;
        struct fm10k_hw *hw = &interface->hw;
        struct msix_entry *entry;
        unsigned int ri = 0, ti = 0;
        int vector, err;

        entry = &interface->msix_entries[NON_Q_VECTORS];

        for (vector = 0; vector < interface->num_q_vectors; vector++) {
                struct fm10k_q_vector *q_vector = interface->q_vector[vector];

                /* name the vector */
                if (q_vector->tx.count && q_vector->rx.count) {
                        snprintf(q_vector->name, sizeof(q_vector->name),
                                 "%s-TxRx-%u", dev->name, ri++);
                        ti++;
                } else if (q_vector->rx.count) {
                        snprintf(q_vector->name, sizeof(q_vector->name),
                                 "%s-rx-%u", dev->name, ri++);
                } else if (q_vector->tx.count) {
                        snprintf(q_vector->name, sizeof(q_vector->name),
                                 "%s-tx-%u", dev->name, ti++);
                } else {
                        /* skip this unused q_vector */
                        continue;
                }

                /* Assign ITR register to q_vector */
                q_vector->itr = (hw->mac.type == fm10k_mac_pf) ?
                                &interface->uc_addr[FM10K_ITR(entry->entry)] :
                                &interface->uc_addr[FM10K_VFITR(entry->entry)];

                /* request the IRQ */
                err = request_irq(entry->vector, &fm10k_msix_clean_rings, 0,
                                  q_vector->name, q_vector);
                if (err) {
                        netif_err(interface, probe, dev,
                                  "request_irq failed for MSIX interrupt Error: %d\n",
                                  err);
                        goto err_out;
                }

                /* assign the mask for this irq */
                irq_set_affinity_hint(entry->vector, &q_vector->affinity_mask);

                /* Enable q_vector */
                writel(FM10K_ITR_ENABLE, q_vector->itr);

                entry++;
        }

        return 0;

err_out:
        /* wind through the ring freeing all entries and vectors */
        while (vector) {
                struct fm10k_q_vector *q_vector;

                entry--;
                vector--;
                q_vector = interface->q_vector[vector];

                if (!q_vector->tx.count && !q_vector->rx.count)
                        continue;

                /* clear the affinity_mask in the IRQ descriptor */
                irq_set_affinity_hint(entry->vector, NULL);

                /* disable interrupts */
                writel(FM10K_ITR_MASK_SET, q_vector->itr);

                free_irq(entry->vector, q_vector);
        }

        return err;
}

void fm10k_up(struct fm10k_intfc *interface)
{
        struct fm10k_hw *hw = &interface->hw;

        /* Enable Tx/Rx DMA */
        hw->mac.ops.start_hw(hw);

        /* configure Tx descriptor rings */
        fm10k_configure_tx(interface);

        /* configure Rx descriptor rings */
        fm10k_configure_rx(interface);

        /* configure interrupts */
        hw->mac.ops.update_int_moderator(hw);

        /* enable statistics capture again */
        clear_bit(__FM10K_UPDATING_STATS, interface->state);

        /* clear down bit to indicate we are ready to go */
        clear_bit(__FM10K_DOWN, interface->state);

        /* enable polling cleanups */
        fm10k_napi_enable_all(interface);

        /* re-establish Rx filters */
        fm10k_restore_rx_state(interface);

        /* enable transmits */
        netif_tx_start_all_queues(interface->netdev);

        /* kick off the service timer now */
        hw->mac.get_host_state = true;
        mod_timer(&interface->service_timer, jiffies);
}

static void fm10k_napi_disable_all(struct fm10k_intfc *interface)
{
        struct fm10k_q_vector *q_vector;
        int q_idx;

        for (q_idx = 0; q_idx < interface->num_q_vectors; q_idx++) {
                q_vector = interface->q_vector[q_idx];
                napi_disable(&q_vector->napi);
        }
}

void fm10k_down(struct fm10k_intfc *interface)
{
        struct net_device *netdev = interface->netdev;
        struct fm10k_hw *hw = &interface->hw;
        int err, i = 0, count = 0;

        /* signal that we are down to the interrupt handler and service task */
        if (test_and_set_bit(__FM10K_DOWN, interface->state))
                return;

        /* call carrier off first to avoid false dev_watchdog timeouts */
        netif_carrier_off(netdev);

        /* disable transmits */
        netif_tx_stop_all_queues(netdev);
        netif_tx_disable(netdev);

        /* reset Rx filters */
        fm10k_reset_rx_state(interface);

        /* disable polling routines */
        fm10k_napi_disable_all(interface);

        /* capture stats one last time before stopping interface */
        fm10k_update_stats(interface);

        /* prevent updating statistics while we're down */
        while (test_and_set_bit(__FM10K_UPDATING_STATS, interface->state))
                usleep_range(1000, 2000);

        /* skip waiting for TX DMA if we lost PCIe link */
        if (FM10K_REMOVED(hw->hw_addr))
                goto skip_tx_dma_drain;

        /* In some rare circumstances it can take a while for Tx queues to
         * quiesce and be fully disabled. Attempt to .stop_hw() first, and
         * then if we get ERR_REQUESTS_PENDING, go ahead and wait in a loop
         * until the Tx queues have emptied, or until a number of retries. If
         * we fail to clear within the retry loop, we will issue a warning
         * indicating that Tx DMA is probably hung. Note this means we call
         * .stop_hw() twice but this shouldn't cause any problems.
         */
        err = hw->mac.ops.stop_hw(hw);
        if (err != FM10K_ERR_REQUESTS_PENDING)
                goto skip_tx_dma_drain;

#define TX_DMA_DRAIN_RETRIES 25
        for (count = 0; count < TX_DMA_DRAIN_RETRIES; count++) {
                usleep_range(10000, 20000);

                /* start checking at the last ring to have pending Tx */
                for (; i < interface->num_tx_queues; i++)
                        if (fm10k_get_tx_pending(interface->tx_ring[i], false))
                                break;

                /* if all the queues are drained, we can break now */
                if (i == interface->num_tx_queues)
                        break;
        }

        if (count >= TX_DMA_DRAIN_RETRIES)
                dev_err(&interface->pdev->dev,
                        "Tx queues failed to drain after %d tries. Tx DMA is probably hung.\n",
                        count);
skip_tx_dma_drain:
        /* Disable DMA engine for Tx/Rx */
        err = hw->mac.ops.stop_hw(hw);
        if (err == FM10K_ERR_REQUESTS_PENDING)
                dev_err(&interface->pdev->dev,
                        "due to pending requests hw was not shut down gracefully\n");
        else if (err)
                dev_err(&interface->pdev->dev, "stop_hw failed: %d\n", err);

        /* free any buffers still on the rings */
        fm10k_clean_all_tx_rings(interface);
        fm10k_clean_all_rx_rings(interface);
}

/**
 * fm10k_sw_init - Initialize general software structures
 * @interface: host interface private structure to initialize
 * @ent: PCI device ID entry
 *
 * fm10k_sw_init initializes the interface private data structure.
 * Fields are initialized based on PCI device information and
 * OS network device settings (MTU size).
 **/
static int fm10k_sw_init(struct fm10k_intfc *interface,
                         const struct pci_device_id *ent)
{
        const struct fm10k_info *fi = fm10k_info_tbl[ent->driver_data];
        struct fm10k_hw *hw = &interface->hw;
        struct pci_dev *pdev = interface->pdev;
        struct net_device *netdev = interface->netdev;
        u32 rss_key[FM10K_RSSRK_SIZE];
        unsigned int rss;
        int err;

        /* initialize back pointer */
        hw->back = interface;
        hw->hw_addr = interface->uc_addr;

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

        /* Setup hw api */
        memcpy(&hw->mac.ops, fi->mac_ops, sizeof(hw->mac.ops));
        hw->mac.type = fi->mac;

        /* Setup IOV handlers */
        if (fi->iov_ops)
                memcpy(&hw->iov.ops, fi->iov_ops, sizeof(hw->iov.ops));

        /* Set common capability flags and settings */

        rss = min_t(int, FM10K_MAX_RSS_INDICES, num_online_cpus());
        interface->ring_feature[RING_F_RSS].limit = rss;
        fi->get_invariants(hw);

        /* pick up the PCIe bus settings for reporting later */
        if (hw->mac.ops.get_bus_info)
                hw->mac.ops.get_bus_info(hw);

        /* limit the usable DMA range */
        if (hw->mac.ops.set_dma_mask)
                hw->mac.ops.set_dma_mask(hw, dma_get_mask(&pdev->dev));

        /* update netdev with DMA restrictions */
        if (dma_get_mask(&pdev->dev) > DMA_BIT_MASK(32)) {
                netdev->features |= NETIF_F_HIGHDMA;
                netdev->vlan_features |= NETIF_F_HIGHDMA;
        }

        /* reset and initialize the hardware so it is in a known state */
        err = hw->mac.ops.reset_hw(hw);
        if (err) {
                dev_err(&pdev->dev, "reset_hw failed: %d\n", err);
                return err;
        }

        err = hw->mac.ops.init_hw(hw);
        if (err) {
                dev_err(&pdev->dev, "init_hw failed: %d\n", err);
                return err;
        }

        /* initialize hardware statistics */
        hw->mac.ops.update_hw_stats(hw, &interface->stats);

        /* Set upper limit on IOV VFs that can be allocated */
        pci_sriov_set_totalvfs(pdev, hw->iov.total_vfs);

        /* Start with random Ethernet address */
        eth_random_addr(hw->mac.addr);

        /* Initialize MAC address from hardware */
        err = hw->mac.ops.read_mac_addr(hw);
        if (err) {
                dev_warn(&pdev->dev,
                         "Failed to obtain MAC address defaulting to random\n");
                /* tag address assignment as random */
                netdev->addr_assign_type |= NET_ADDR_RANDOM;
        }

        ether_addr_copy(netdev->dev_addr, hw->mac.addr);
        ether_addr_copy(netdev->perm_addr, hw->mac.addr);

        if (!is_valid_ether_addr(netdev->perm_addr)) {
                dev_err(&pdev->dev, "Invalid MAC Address\n");
                return -EIO;
        }

        /* initialize DCBNL interface */
        fm10k_dcbnl_set_ops(netdev);

        /* set default ring sizes */
        interface->tx_ring_count = FM10K_DEFAULT_TXD;
        interface->rx_ring_count = FM10K_DEFAULT_RXD;

        /* set default interrupt moderation */
        interface->tx_itr = FM10K_TX_ITR_DEFAULT;
        interface->rx_itr = FM10K_ITR_ADAPTIVE | FM10K_RX_ITR_DEFAULT;

        /* Initialize the MAC/VLAN queue */
        INIT_LIST_HEAD(&interface->macvlan_requests);

        netdev_rss_key_fill(rss_key, sizeof(rss_key));
        memcpy(interface->rssrk, rss_key, sizeof(rss_key));

        /* Initialize the mailbox lock */
        spin_lock_init(&interface->mbx_lock);
        spin_lock_init(&interface->macvlan_lock);

        /* Start off interface as being down */
        set_bit(__FM10K_DOWN, interface->state);
        set_bit(__FM10K_UPDATING_STATS, interface->state);

        return 0;
}

/**
 * fm10k_probe - Device Initialization Routine
 * @pdev: PCI device information struct
 * @ent: entry in fm10k_pci_tbl
 *
 * Returns 0 on success, negative on failure
 *
 * fm10k_probe initializes an interface identified by a pci_dev structure.
 * The OS initialization, configuring of the interface private structure,
 * and a hardware reset occur.
 **/
static int fm10k_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
{
        struct net_device *netdev;
        struct fm10k_intfc *interface;
        int err;

        if (pdev->error_state != pci_channel_io_normal) {
                dev_err(&pdev->dev,
                        "PCI device still in an error state. Unable to load...\n");
                return -EIO;
        }

        err = pci_enable_device_mem(pdev);
        if (err) {
                dev_err(&pdev->dev,
                        "PCI enable device failed: %d\n", err);
                return err;
        }

        err = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(48));
        if (err)
                err = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32));
        if (err) {
                dev_err(&pdev->dev,
                        "DMA configuration failed: %d\n", err);
                goto err_dma;
        }

        err = pci_request_mem_regions(pdev, fm10k_driver_name);
        if (err) {
                dev_err(&pdev->dev,
                        "pci_request_selected_regions failed: %d\n", err);
                goto err_pci_reg;
        }

        pci_enable_pcie_error_reporting(pdev);

        pci_set_master(pdev);
        pci_save_state(pdev);

        netdev = fm10k_alloc_netdev(fm10k_info_tbl[ent->driver_data]);
        if (!netdev) {
                err = -ENOMEM;
                goto err_alloc_netdev;
        }

        SET_NETDEV_DEV(netdev, &pdev->dev);

        interface = netdev_priv(netdev);
        pci_set_drvdata(pdev, interface);

        interface->netdev = netdev;
        interface->pdev = pdev;

        interface->uc_addr = ioremap(pci_resource_start(pdev, 0),
                                     FM10K_UC_ADDR_SIZE);
        if (!interface->uc_addr) {
                err = -EIO;
                goto err_ioremap;
        }

        err = fm10k_sw_init(interface, ent);
        if (err)
                goto err_sw_init;

        /* enable debugfs support */
        fm10k_dbg_intfc_init(interface);

        err = fm10k_init_queueing_scheme(interface);
        if (err)
                goto err_sw_init;

        /* the mbx interrupt might attempt to schedule the service task, so we
         * must ensure it is disabled since we haven't yet requested the timer
         * or work item.
         */
        set_bit(__FM10K_SERVICE_DISABLE, interface->state);

        err = fm10k_mbx_request_irq(interface);
        if (err)
                goto err_mbx_interrupt;

        /* final check of hardware state before registering the interface */
        err = fm10k_hw_ready(interface);
        if (err)
                goto err_register;

        err = register_netdev(netdev);
        if (err)
                goto err_register;

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

        /* stop all the transmit queues from transmitting until link is up */
        netif_tx_stop_all_queues(netdev);

        /* Initialize service timer and service task late in order to avoid
         * cleanup issues.
         */
        timer_setup(&interface->service_timer, fm10k_service_timer, 0);
        INIT_WORK(&interface->service_task, fm10k_service_task);

        /* Setup the MAC/VLAN queue */
        INIT_DELAYED_WORK(&interface->macvlan_task, fm10k_macvlan_task);

        /* kick off service timer now, even when interface is down */
        mod_timer(&interface->service_timer, (HZ * 2) + jiffies);

        /* print warning for non-optimal configurations */
        pcie_print_link_status(interface->pdev);

        /* report MAC address for logging */
        dev_info(&pdev->dev, "%pM\n", netdev->dev_addr);

        /* enable SR-IOV after registering netdev to enforce PF/VF ordering */
        fm10k_iov_configure(pdev, 0);

        /* clear the service task disable bit and kick off service task */
        clear_bit(__FM10K_SERVICE_DISABLE, interface->state);
        fm10k_service_event_schedule(interface);

        return 0;

err_register:
        fm10k_mbx_free_irq(interface);
err_mbx_interrupt:
        fm10k_clear_queueing_scheme(interface);
err_sw_init:
        if (interface->sw_addr)
                iounmap(interface->sw_addr);
        iounmap(interface->uc_addr);
err_ioremap:
        free_netdev(netdev);
err_alloc_netdev:
        pci_release_mem_regions(pdev);
err_pci_reg:
err_dma:
        pci_disable_device(pdev);
        return err;
}

/**
 * fm10k_remove - Device Removal Routine
 * @pdev: PCI device information struct
 *
 * fm10k_remove is called by the PCI subsystem to alert the driver
 * that it should release a PCI device.  The could be caused by a
 * Hot-Plug event, or because the driver is going to be removed from
 * memory.
 **/
static void fm10k_remove(struct pci_dev *pdev)
{
        struct fm10k_intfc *interface = pci_get_drvdata(pdev);
        struct net_device *netdev = interface->netdev;

        del_timer_sync(&interface->service_timer);

        fm10k_stop_service_event(interface);
        fm10k_stop_macvlan_task(interface);

        /* Remove all pending MAC/VLAN requests */
        fm10k_clear_macvlan_queue(interface, interface->glort, true);

        /* free netdev, this may bounce the interrupts due to setup_tc */
        if (netdev->reg_state == NETREG_REGISTERED)
                unregister_netdev(netdev);

        /* release VFs */
        fm10k_iov_disable(pdev);

        /* disable mailbox interrupt */
        fm10k_mbx_free_irq(interface);

        /* free interrupts */
        fm10k_clear_queueing_scheme(interface);

        /* remove any debugfs interfaces */
        fm10k_dbg_intfc_exit(interface);

        if (interface->sw_addr)
                iounmap(interface->sw_addr);
        iounmap(interface->uc_addr);

        free_netdev(netdev);

        pci_release_mem_regions(pdev);

        pci_disable_pcie_error_reporting(pdev);

        pci_disable_device(pdev);
}

static void fm10k_prepare_suspend(struct fm10k_intfc *interface)
{
        /* the watchdog task reads from registers, which might appear like
         * a surprise remove if the PCIe device is disabled while we're
         * stopped. We stop the watchdog task until after we resume software
         * activity.
         *
         * Note that the MAC/VLAN task will be stopped as part of preparing
         * for reset so we don't need to handle it here.
         */
        fm10k_stop_service_event(interface);

        if (fm10k_prepare_for_reset(interface))
                set_bit(__FM10K_RESET_SUSPENDED, interface->state);
}

static int fm10k_handle_resume(struct fm10k_intfc *interface)
{
        struct fm10k_hw *hw = &interface->hw;
        int err;

        /* Even if we didn't properly prepare for reset in
         * fm10k_prepare_suspend, we'll attempt to resume anyways.
         */
        if (!test_and_clear_bit(__FM10K_RESET_SUSPENDED, interface->state))
                dev_warn(&interface->pdev->dev,
                         "Device was shut down as part of suspend... Attempting to recover\n");

        /* reset statistics starting values */
        hw->mac.ops.rebind_hw_stats(hw, &interface->stats);

        err = fm10k_handle_reset(interface);
        if (err)
                return err;

        /* assume host is not ready, to prevent race with watchdog in case we
         * actually don't have connection to the switch
         */
        interface->host_ready = false;
        fm10k_watchdog_host_not_ready(interface);

        /* force link to stay down for a second to prevent link flutter */
        interface->link_down_event = jiffies + (HZ);
        set_bit(__FM10K_LINK_DOWN, interface->state);

        /* restart the service task */
        fm10k_start_service_event(interface);

        /* Restart the MAC/VLAN request queue in-case of outstanding events */
        fm10k_macvlan_schedule(interface);

        return 0;
}

/**
 * fm10k_resume - Generic PM resume hook
 * @dev: generic device structure
 *
 * Generic PM hook used when waking the device from a low power state after
 * suspend or hibernation. This function does not need to handle lower PCIe
 * device state as the stack takes care of that for us.
 **/
static int __maybe_unused fm10k_resume(struct device *dev)
{
        struct fm10k_intfc *interface = dev_get_drvdata(dev);
        struct net_device *netdev = interface->netdev;
        struct fm10k_hw *hw = &interface->hw;
        int err;

        /* refresh hw_addr in case it was dropped */
        hw->hw_addr = interface->uc_addr;

        err = fm10k_handle_resume(interface);
        if (err)
                return err;

        netif_device_attach(netdev);

        return 0;
}

/**
 * fm10k_suspend - Generic PM suspend hook
 * @dev: generic device structure
 *
 * Generic PM hook used when setting the device into a low power state for
 * system suspend or hibernation. This function does not need to handle lower
 * PCIe device state as the stack takes care of that for us.
 **/
static int __maybe_unused fm10k_suspend(struct device *dev)
{
        struct fm10k_intfc *interface = dev_get_drvdata(dev);
        struct net_device *netdev = interface->netdev;

        netif_device_detach(netdev);

        fm10k_prepare_suspend(interface);

        return 0;
}

/**
 * fm10k_io_error_detected - called when PCI error is detected
 * @pdev: Pointer to PCI device
 * @state: The current pci connection state
 *
 * This function is called after a PCI bus error affecting
 * this device has been detected.
 */
static pci_ers_result_t fm10k_io_error_detected(struct pci_dev *pdev,
                                                pci_channel_state_t state)
{
        struct fm10k_intfc *interface = pci_get_drvdata(pdev);
        struct net_device *netdev = interface->netdev;

        netif_device_detach(netdev);

        if (state == pci_channel_io_perm_failure)
                return PCI_ERS_RESULT_DISCONNECT;

        fm10k_prepare_suspend(interface);

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

/**
 * fm10k_io_slot_reset - called after the pci bus has been reset.
 * @pdev: Pointer to PCI device
 *
 * Restart the card from scratch, as if from a cold-boot.
 */
static pci_ers_result_t fm10k_io_slot_reset(struct pci_dev *pdev)
{
        pci_ers_result_t result;

        if (pci_reenable_device(pdev)) {
                dev_err(&pdev->dev,
                        "Cannot re-enable PCI device after reset.\n");
                result = PCI_ERS_RESULT_DISCONNECT;
        } else {
                pci_set_master(pdev);
                pci_restore_state(pdev);

                /* After second error pci->state_saved is false, this
                 * resets it so EEH doesn't break.
                 */
                pci_save_state(pdev);

                pci_wake_from_d3(pdev, false);

                result = PCI_ERS_RESULT_RECOVERED;
        }

        return result;
}

/**
 * fm10k_io_resume - called when traffic can start flowing again.
 * @pdev: Pointer to PCI device
 *
 * This callback is called when the error recovery driver tells us that
 * its OK to resume normal operation.
 */
static void fm10k_io_resume(struct pci_dev *pdev)
{
        struct fm10k_intfc *interface = pci_get_drvdata(pdev);
        struct net_device *netdev = interface->netdev;
        int err;

        err = fm10k_handle_resume(interface);

        if (err)
                dev_warn(&pdev->dev,
                         "%s failed: %d\n", __func__, err);
        else
                netif_device_attach(netdev);
}

/**
 * fm10k_io_reset_prepare - called when PCI function is about to be reset
 * @pdev: Pointer to PCI device
 *
 * This callback is called when the PCI function is about to be reset,
 * allowing the device driver to prepare for it.
 */
static void fm10k_io_reset_prepare(struct pci_dev *pdev)
{
        /* warn incase we have any active VF devices */
        if (pci_num_vf(pdev))
                dev_warn(&pdev->dev,
                         "PCIe FLR may cause issues for any active VF devices\n");
        fm10k_prepare_suspend(pci_get_drvdata(pdev));
}

/**
 * fm10k_io_reset_done - called when PCI function has finished resetting
 * @pdev: Pointer to PCI device
 *
 * This callback is called just after the PCI function is reset, such as via
 * /sys/class/net/<enpX>/device/reset or similar.
 */
static void fm10k_io_reset_done(struct pci_dev *pdev)
{
        struct fm10k_intfc *interface = pci_get_drvdata(pdev);
        int err = fm10k_handle_resume(interface);

        if (err) {
                dev_warn(&pdev->dev,
                         "%s failed: %d\n", __func__, err);
                netif_device_detach(interface->netdev);
        }
}

static const struct pci_error_handlers fm10k_err_handler = {
        .error_detected = fm10k_io_error_detected,
        .slot_reset = fm10k_io_slot_reset,
        .resume = fm10k_io_resume,
        .reset_prepare = fm10k_io_reset_prepare,
        .reset_done = fm10k_io_reset_done,
};

static SIMPLE_DEV_PM_OPS(fm10k_pm_ops, fm10k_suspend, fm10k_resume);

static struct pci_driver fm10k_driver = {
        .name                   = fm10k_driver_name,
        .id_table               = fm10k_pci_tbl,
        .probe                  = fm10k_probe,
        .remove                 = fm10k_remove,
        .driver = {
                .pm             = &fm10k_pm_ops,
        },
        .sriov_configure        = fm10k_iov_configure,
        .err_handler            = &fm10k_err_handler
};

/**
 * fm10k_register_pci_driver - register driver interface
 *
 * This function is called on module load in order to register the driver.
 **/
int fm10k_register_pci_driver(void)
{
        return pci_register_driver(&fm10k_driver);
}

/**
 * fm10k_unregister_pci_driver - unregister driver interface
 *
 * This function is called on module unload in order to remove the driver.
 **/
void fm10k_unregister_pci_driver(void)
{
        pci_unregister_driver(&fm10k_driver);
}