OSCL-LXR linux-6.0.1/​drivers/​net/​ethernet/​intel/​fm10k/​fm10k_pci.c	Source navigation Diff markup Identifier search General search
	Version: linux-6.0.1 spark-3.0.0 hadoop-3.2.0-src hadoop-3.3.0-src spark-2.4.7 linux-4.15.13 hadoop-2.7.4-src Revert   Change

 // 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;
 
     /* 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);
             eth_hw_addr_set(netdev, 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;
 
     /* 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)) {
         s32 err = mbx->ops.process(hw, mbx);
 
         if (err == FM10K_ERR_RESET_REQUESTED)
             set_bit(FM10K_FLAG_RESET_REQUESTED, interface->flags);
 
         /* handle VFLRE events */
         fm10k_iov_event(interface);
         fm10k_mbx_unlock(interface);
     }
 
     /* 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;
     }
 
     eth_hw_addr_set(netdev, 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_disable_pcie_error_reporting(pdev);
     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);
 }

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